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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * pmcraid.c -- driver for PMC Sierra MaxRAID controller adapters
4 *
5 * Written By: Anil Ravindranath<anil_ravindranath@pmc-sierra.com>
6 * PMC-Sierra Inc
7 *
8 * Copyright (C) 2008, 2009 PMC Sierra Inc
9 */
10#include <linux/fs.h>
11#include <linux/init.h>
12#include <linux/types.h>
13#include <linux/errno.h>
14#include <linux/kernel.h>
15#include <linux/ioport.h>
16#include <linux/delay.h>
17#include <linux/pci.h>
18#include <linux/wait.h>
19#include <linux/spinlock.h>
20#include <linux/sched.h>
21#include <linux/interrupt.h>
22#include <linux/blkdev.h>
23#include <linux/firmware.h>
24#include <linux/module.h>
25#include <linux/moduleparam.h>
26#include <linux/hdreg.h>
27#include <linux/io.h>
28#include <linux/slab.h>
29#include <asm/irq.h>
30#include <asm/processor.h>
31#include <linux/libata.h>
32#include <linux/mutex.h>
33#include <linux/ktime.h>
34#include <scsi/scsi.h>
35#include <scsi/scsi_host.h>
36#include <scsi/scsi_device.h>
37#include <scsi/scsi_tcq.h>
38#include <scsi/scsi_eh.h>
39#include <scsi/scsi_cmnd.h>
40#include <scsi/scsicam.h>
41
42#include "pmcraid.h"
43
44/*
45 * Module configuration parameters
46 */
47static unsigned int pmcraid_debug_log;
48static unsigned int pmcraid_disable_aen;
49static unsigned int pmcraid_log_level = IOASC_LOG_LEVEL_MUST;
50static unsigned int pmcraid_enable_msix;
51
52/*
53 * Data structures to support multiple adapters by the LLD.
54 * pmcraid_adapter_count - count of configured adapters
55 */
56static atomic_t pmcraid_adapter_count = ATOMIC_INIT(0);
57
58/*
59 * Supporting user-level control interface through IOCTL commands.
60 * pmcraid_major - major number to use
61 * pmcraid_minor - minor number(s) to use
62 */
63static unsigned int pmcraid_major;
64static const struct class pmcraid_class = {
65 .name = PMCRAID_DEVFILE,
66};
67static DECLARE_BITMAP(pmcraid_minor, PMCRAID_MAX_ADAPTERS);
68
69/*
70 * Module parameters
71 */
72MODULE_AUTHOR("Anil Ravindranath<anil_ravindranath@pmc-sierra.com>");
73MODULE_DESCRIPTION("PMC Sierra MaxRAID Controller Driver");
74MODULE_LICENSE("GPL");
75MODULE_VERSION(PMCRAID_DRIVER_VERSION);
76
77module_param_named(log_level, pmcraid_log_level, uint, (S_IRUGO | S_IWUSR));
78MODULE_PARM_DESC(log_level,
79 "Enables firmware error code logging, default :1 high-severity"
80 " errors, 2: all errors including high-severity errors,"
81 " 0: disables logging");
82
83module_param_named(debug, pmcraid_debug_log, uint, (S_IRUGO | S_IWUSR));
84MODULE_PARM_DESC(debug,
85 "Enable driver verbose message logging. Set 1 to enable."
86 "(default: 0)");
87
88module_param_named(disable_aen, pmcraid_disable_aen, uint, (S_IRUGO | S_IWUSR));
89MODULE_PARM_DESC(disable_aen,
90 "Disable driver aen notifications to apps. Set 1 to disable."
91 "(default: 0)");
92
93/* chip specific constants for PMC MaxRAID controllers (same for
94 * 0x5220 and 0x8010
95 */
96static struct pmcraid_chip_details pmcraid_chip_cfg[] = {
97 {
98 .ioastatus = 0x0,
99 .ioarrin = 0x00040,
100 .mailbox = 0x7FC30,
101 .global_intr_mask = 0x00034,
102 .ioa_host_intr = 0x0009C,
103 .ioa_host_intr_clr = 0x000A0,
104 .ioa_host_msix_intr = 0x7FC40,
105 .ioa_host_mask = 0x7FC28,
106 .ioa_host_mask_clr = 0x7FC28,
107 .host_ioa_intr = 0x00020,
108 .host_ioa_intr_clr = 0x00020,
109 .transop_timeout = 300
110 }
111};
112
113/*
114 * PCI device ids supported by pmcraid driver
115 */
116static struct pci_device_id pmcraid_pci_table[] = {
117 { PCI_DEVICE(PCI_VENDOR_ID_PMC, PCI_DEVICE_ID_PMC_MAXRAID),
118 0, 0, (kernel_ulong_t)&pmcraid_chip_cfg[0]
119 },
120 {}
121};
122
123MODULE_DEVICE_TABLE(pci, pmcraid_pci_table);
124
125
126
127/**
128 * pmcraid_slave_alloc - Prepare for commands to a device
129 * @scsi_dev: scsi device struct
130 *
131 * This function is called by mid-layer prior to sending any command to the new
132 * device. Stores resource entry details of the device in scsi_device struct.
133 * Queuecommand uses the resource handle and other details to fill up IOARCB
134 * while sending commands to the device.
135 *
136 * Return value:
137 * 0 on success / -ENXIO if device does not exist
138 */
139static int pmcraid_slave_alloc(struct scsi_device *scsi_dev)
140{
141 struct pmcraid_resource_entry *temp, *res = NULL;
142 struct pmcraid_instance *pinstance;
143 u8 target, bus, lun;
144 unsigned long lock_flags;
145 int rc = -ENXIO;
146 u16 fw_version;
147
148 pinstance = shost_priv(scsi_dev->host);
149
150 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
151
152 /* Driver exposes VSET and GSCSI resources only; all other device types
153 * are not exposed. Resource list is synchronized using resource lock
154 * so any traversal or modifications to the list should be done inside
155 * this lock
156 */
157 spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
158 list_for_each_entry(temp, &pinstance->used_res_q, queue) {
159
160 /* do not expose VSETs with order-ids > MAX_VSET_TARGETS */
161 if (RES_IS_VSET(temp->cfg_entry)) {
162 if (fw_version <= PMCRAID_FW_VERSION_1)
163 target = temp->cfg_entry.unique_flags1;
164 else
165 target = le16_to_cpu(temp->cfg_entry.array_id) & 0xFF;
166
167 if (target > PMCRAID_MAX_VSET_TARGETS)
168 continue;
169 bus = PMCRAID_VSET_BUS_ID;
170 lun = 0;
171 } else if (RES_IS_GSCSI(temp->cfg_entry)) {
172 target = RES_TARGET(temp->cfg_entry.resource_address);
173 bus = PMCRAID_PHYS_BUS_ID;
174 lun = RES_LUN(temp->cfg_entry.resource_address);
175 } else {
176 continue;
177 }
178
179 if (bus == scsi_dev->channel &&
180 target == scsi_dev->id &&
181 lun == scsi_dev->lun) {
182 res = temp;
183 break;
184 }
185 }
186
187 if (res) {
188 res->scsi_dev = scsi_dev;
189 scsi_dev->hostdata = res;
190 res->change_detected = 0;
191 atomic_set(&res->read_failures, 0);
192 atomic_set(&res->write_failures, 0);
193 rc = 0;
194 }
195 spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
196 return rc;
197}
198
199/**
200 * pmcraid_slave_configure - Configures a SCSI device
201 * @scsi_dev: scsi device struct
202 *
203 * This function is executed by SCSI mid layer just after a device is first
204 * scanned (i.e. it has responded to an INQUIRY). For VSET resources, the
205 * timeout value (default 30s) will be over-written to a higher value (60s)
206 * and max_sectors value will be over-written to 512. It also sets queue depth
207 * to host->cmd_per_lun value
208 *
209 * Return value:
210 * 0 on success
211 */
212static int pmcraid_slave_configure(struct scsi_device *scsi_dev)
213{
214 struct pmcraid_resource_entry *res = scsi_dev->hostdata;
215
216 if (!res)
217 return 0;
218
219 /* LLD exposes VSETs and Enclosure devices only */
220 if (RES_IS_GSCSI(res->cfg_entry) &&
221 scsi_dev->type != TYPE_ENCLOSURE)
222 return -ENXIO;
223
224 pmcraid_info("configuring %x:%x:%x:%x\n",
225 scsi_dev->host->unique_id,
226 scsi_dev->channel,
227 scsi_dev->id,
228 (u8)scsi_dev->lun);
229
230 if (RES_IS_GSCSI(res->cfg_entry)) {
231 scsi_dev->allow_restart = 1;
232 } else if (RES_IS_VSET(res->cfg_entry)) {
233 scsi_dev->allow_restart = 1;
234 blk_queue_rq_timeout(scsi_dev->request_queue,
235 PMCRAID_VSET_IO_TIMEOUT);
236 blk_queue_max_hw_sectors(scsi_dev->request_queue,
237 PMCRAID_VSET_MAX_SECTORS);
238 }
239
240 /*
241 * We never want to report TCQ support for these types of devices.
242 */
243 if (!RES_IS_GSCSI(res->cfg_entry) && !RES_IS_VSET(res->cfg_entry))
244 scsi_dev->tagged_supported = 0;
245
246 return 0;
247}
248
249/**
250 * pmcraid_slave_destroy - Unconfigure a SCSI device before removing it
251 *
252 * @scsi_dev: scsi device struct
253 *
254 * This is called by mid-layer before removing a device. Pointer assignments
255 * done in pmcraid_slave_alloc will be reset to NULL here.
256 *
257 * Return value
258 * none
259 */
260static void pmcraid_slave_destroy(struct scsi_device *scsi_dev)
261{
262 struct pmcraid_resource_entry *res;
263
264 res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;
265
266 if (res)
267 res->scsi_dev = NULL;
268
269 scsi_dev->hostdata = NULL;
270}
271
272/**
273 * pmcraid_change_queue_depth - Change the device's queue depth
274 * @scsi_dev: scsi device struct
275 * @depth: depth to set
276 *
277 * Return value
278 * actual depth set
279 */
280static int pmcraid_change_queue_depth(struct scsi_device *scsi_dev, int depth)
281{
282 if (depth > PMCRAID_MAX_CMD_PER_LUN)
283 depth = PMCRAID_MAX_CMD_PER_LUN;
284 return scsi_change_queue_depth(scsi_dev, depth);
285}
286
287/**
288 * pmcraid_init_cmdblk - initializes a command block
289 *
290 * @cmd: pointer to struct pmcraid_cmd to be initialized
291 * @index: if >=0 first time initialization; otherwise reinitialization
292 *
293 * Return Value
294 * None
295 */
296static void pmcraid_init_cmdblk(struct pmcraid_cmd *cmd, int index)
297{
298 struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
299 dma_addr_t dma_addr = cmd->ioa_cb_bus_addr;
300
301 if (index >= 0) {
302 /* first time initialization (called from probe) */
303 u32 ioasa_offset =
304 offsetof(struct pmcraid_control_block, ioasa);
305
306 cmd->index = index;
307 ioarcb->response_handle = cpu_to_le32(index << 2);
308 ioarcb->ioarcb_bus_addr = cpu_to_le64(dma_addr);
309 ioarcb->ioasa_bus_addr = cpu_to_le64(dma_addr + ioasa_offset);
310 ioarcb->ioasa_len = cpu_to_le16(sizeof(struct pmcraid_ioasa));
311 } else {
312 /* re-initialization of various lengths, called once command is
313 * processed by IOA
314 */
315 memset(&cmd->ioa_cb->ioarcb.cdb, 0, PMCRAID_MAX_CDB_LEN);
316 ioarcb->hrrq_id = 0;
317 ioarcb->request_flags0 = 0;
318 ioarcb->request_flags1 = 0;
319 ioarcb->cmd_timeout = 0;
320 ioarcb->ioarcb_bus_addr &= cpu_to_le64(~0x1FULL);
321 ioarcb->ioadl_bus_addr = 0;
322 ioarcb->ioadl_length = 0;
323 ioarcb->data_transfer_length = 0;
324 ioarcb->add_cmd_param_length = 0;
325 ioarcb->add_cmd_param_offset = 0;
326 cmd->ioa_cb->ioasa.ioasc = 0;
327 cmd->ioa_cb->ioasa.residual_data_length = 0;
328 cmd->time_left = 0;
329 }
330
331 cmd->cmd_done = NULL;
332 cmd->scsi_cmd = NULL;
333 cmd->release = 0;
334 cmd->completion_req = 0;
335 cmd->sense_buffer = NULL;
336 cmd->sense_buffer_dma = 0;
337 cmd->dma_handle = 0;
338 timer_setup(&cmd->timer, NULL, 0);
339}
340
341/**
342 * pmcraid_reinit_cmdblk - reinitialize a command block
343 *
344 * @cmd: pointer to struct pmcraid_cmd to be reinitialized
345 *
346 * Return Value
347 * None
348 */
349static void pmcraid_reinit_cmdblk(struct pmcraid_cmd *cmd)
350{
351 pmcraid_init_cmdblk(cmd, -1);
352}
353
354/**
355 * pmcraid_get_free_cmd - get a free cmd block from command block pool
356 * @pinstance: adapter instance structure
357 *
358 * Return Value:
359 * returns pointer to cmd block or NULL if no blocks are available
360 */
361static struct pmcraid_cmd *pmcraid_get_free_cmd(
362 struct pmcraid_instance *pinstance
363)
364{
365 struct pmcraid_cmd *cmd = NULL;
366 unsigned long lock_flags;
367
368 /* free cmd block list is protected by free_pool_lock */
369 spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
370
371 if (!list_empty(&pinstance->free_cmd_pool)) {
372 cmd = list_entry(pinstance->free_cmd_pool.next,
373 struct pmcraid_cmd, free_list);
374 list_del(&cmd->free_list);
375 }
376 spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
377
378 /* Initialize the command block before giving it the caller */
379 if (cmd != NULL)
380 pmcraid_reinit_cmdblk(cmd);
381 return cmd;
382}
383
384/**
385 * pmcraid_return_cmd - return a completed command block back into free pool
386 * @cmd: pointer to the command block
387 *
388 * Return Value:
389 * nothing
390 */
391static void pmcraid_return_cmd(struct pmcraid_cmd *cmd)
392{
393 struct pmcraid_instance *pinstance = cmd->drv_inst;
394 unsigned long lock_flags;
395
396 spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
397 list_add_tail(&cmd->free_list, &pinstance->free_cmd_pool);
398 spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
399}
400
401/**
402 * pmcraid_read_interrupts - reads IOA interrupts
403 *
404 * @pinstance: pointer to adapter instance structure
405 *
406 * Return value
407 * interrupts read from IOA
408 */
409static u32 pmcraid_read_interrupts(struct pmcraid_instance *pinstance)
410{
411 return (pinstance->interrupt_mode) ?
412 ioread32(pinstance->int_regs.ioa_host_msix_interrupt_reg) :
413 ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
414}
415
416/**
417 * pmcraid_disable_interrupts - Masks and clears all specified interrupts
418 *
419 * @pinstance: pointer to per adapter instance structure
420 * @intrs: interrupts to disable
421 *
422 * Return Value
423 * None
424 */
425static void pmcraid_disable_interrupts(
426 struct pmcraid_instance *pinstance,
427 u32 intrs
428)
429{
430 u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
431 u32 nmask = gmask | GLOBAL_INTERRUPT_MASK;
432
433 iowrite32(intrs, pinstance->int_regs.ioa_host_interrupt_clr_reg);
434 iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
435 ioread32(pinstance->int_regs.global_interrupt_mask_reg);
436
437 if (!pinstance->interrupt_mode) {
438 iowrite32(intrs,
439 pinstance->int_regs.ioa_host_interrupt_mask_reg);
440 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
441 }
442}
443
444/**
445 * pmcraid_enable_interrupts - Enables specified interrupts
446 *
447 * @pinstance: pointer to per adapter instance structure
448 * @intrs: interrupts to enable
449 *
450 * Return Value
451 * None
452 */
453static void pmcraid_enable_interrupts(
454 struct pmcraid_instance *pinstance,
455 u32 intrs)
456{
457 u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
458 u32 nmask = gmask & (~GLOBAL_INTERRUPT_MASK);
459
460 iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
461
462 if (!pinstance->interrupt_mode) {
463 iowrite32(~intrs,
464 pinstance->int_regs.ioa_host_interrupt_mask_reg);
465 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
466 }
467
468 pmcraid_info("enabled interrupts global mask = %x intr_mask = %x\n",
469 ioread32(pinstance->int_regs.global_interrupt_mask_reg),
470 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg));
471}
472
473/**
474 * pmcraid_clr_trans_op - clear trans to op interrupt
475 *
476 * @pinstance: pointer to per adapter instance structure
477 *
478 * Return Value
479 * None
480 */
481static void pmcraid_clr_trans_op(
482 struct pmcraid_instance *pinstance
483)
484{
485 unsigned long lock_flags;
486
487 if (!pinstance->interrupt_mode) {
488 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
489 pinstance->int_regs.ioa_host_interrupt_mask_reg);
490 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
491 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
492 pinstance->int_regs.ioa_host_interrupt_clr_reg);
493 ioread32(pinstance->int_regs.ioa_host_interrupt_clr_reg);
494 }
495
496 if (pinstance->reset_cmd != NULL) {
497 del_timer(&pinstance->reset_cmd->timer);
498 spin_lock_irqsave(
499 pinstance->host->host_lock, lock_flags);
500 pinstance->reset_cmd->cmd_done(pinstance->reset_cmd);
501 spin_unlock_irqrestore(
502 pinstance->host->host_lock, lock_flags);
503 }
504}
505
506/**
507 * pmcraid_reset_type - Determine the required reset type
508 * @pinstance: pointer to adapter instance structure
509 *
510 * IOA requires hard reset if any of the following conditions is true.
511 * 1. If HRRQ valid interrupt is not masked
512 * 2. IOA reset alert doorbell is set
513 * 3. If there are any error interrupts
514 */
515static void pmcraid_reset_type(struct pmcraid_instance *pinstance)
516{
517 u32 mask;
518 u32 intrs;
519 u32 alerts;
520
521 mask = ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
522 intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
523 alerts = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
524
525 if ((mask & INTRS_HRRQ_VALID) == 0 ||
526 (alerts & DOORBELL_IOA_RESET_ALERT) ||
527 (intrs & PMCRAID_ERROR_INTERRUPTS)) {
528 pmcraid_info("IOA requires hard reset\n");
529 pinstance->ioa_hard_reset = 1;
530 }
531
532 /* If unit check is active, trigger the dump */
533 if (intrs & INTRS_IOA_UNIT_CHECK)
534 pinstance->ioa_unit_check = 1;
535}
536
537static void pmcraid_ioa_reset(struct pmcraid_cmd *);
538/**
539 * pmcraid_bist_done - completion function for PCI BIST
540 * @t: pointer to reset command
541 * Return Value
542 * none
543 */
544static void pmcraid_bist_done(struct timer_list *t)
545{
546 struct pmcraid_cmd *cmd = from_timer(cmd, t, timer);
547 struct pmcraid_instance *pinstance = cmd->drv_inst;
548 unsigned long lock_flags;
549 int rc;
550 u16 pci_reg;
551
552 rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
553
554 /* If PCI config space can't be accessed wait for another two secs */
555 if ((rc != PCIBIOS_SUCCESSFUL || (!(pci_reg & PCI_COMMAND_MEMORY))) &&
556 cmd->time_left > 0) {
557 pmcraid_info("BIST not complete, waiting another 2 secs\n");
558 cmd->timer.expires = jiffies + cmd->time_left;
559 cmd->time_left = 0;
560 add_timer(&cmd->timer);
561 } else {
562 cmd->time_left = 0;
563 pmcraid_info("BIST is complete, proceeding with reset\n");
564 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
565 pmcraid_ioa_reset(cmd);
566 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
567 }
568}
569
570/**
571 * pmcraid_start_bist - starts BIST
572 * @cmd: pointer to reset cmd
573 * Return Value
574 * none
575 */
576static void pmcraid_start_bist(struct pmcraid_cmd *cmd)
577{
578 struct pmcraid_instance *pinstance = cmd->drv_inst;
579 u32 doorbells, intrs;
580
581 /* proceed with bist and wait for 2 seconds */
582 iowrite32(DOORBELL_IOA_START_BIST,
583 pinstance->int_regs.host_ioa_interrupt_reg);
584 doorbells = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
585 intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
586 pmcraid_info("doorbells after start bist: %x intrs: %x\n",
587 doorbells, intrs);
588
589 cmd->time_left = msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
590 cmd->timer.expires = jiffies + msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
591 cmd->timer.function = pmcraid_bist_done;
592 add_timer(&cmd->timer);
593}
594
595/**
596 * pmcraid_reset_alert_done - completion routine for reset_alert
597 * @t: pointer to command block used in reset sequence
598 * Return value
599 * None
600 */
601static void pmcraid_reset_alert_done(struct timer_list *t)
602{
603 struct pmcraid_cmd *cmd = from_timer(cmd, t, timer);
604 struct pmcraid_instance *pinstance = cmd->drv_inst;
605 u32 status = ioread32(pinstance->ioa_status);
606 unsigned long lock_flags;
607
608 /* if the critical operation in progress bit is set or the wait times
609 * out, invoke reset engine to proceed with hard reset. If there is
610 * some more time to wait, restart the timer
611 */
612 if (((status & INTRS_CRITICAL_OP_IN_PROGRESS) == 0) ||
613 cmd->time_left <= 0) {
614 pmcraid_info("critical op is reset proceeding with reset\n");
615 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
616 pmcraid_ioa_reset(cmd);
617 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
618 } else {
619 pmcraid_info("critical op is not yet reset waiting again\n");
620 /* restart timer if some more time is available to wait */
621 cmd->time_left -= PMCRAID_CHECK_FOR_RESET_TIMEOUT;
622 cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
623 cmd->timer.function = pmcraid_reset_alert_done;
624 add_timer(&cmd->timer);
625 }
626}
627
628static void pmcraid_notify_ioastate(struct pmcraid_instance *, u32);
629/**
630 * pmcraid_reset_alert - alerts IOA for a possible reset
631 * @cmd: command block to be used for reset sequence.
632 *
633 * Return Value
634 * returns 0 if pci config-space is accessible and RESET_DOORBELL is
635 * successfully written to IOA. Returns non-zero in case pci_config_space
636 * is not accessible
637 */
638static void pmcraid_reset_alert(struct pmcraid_cmd *cmd)
639{
640 struct pmcraid_instance *pinstance = cmd->drv_inst;
641 u32 doorbells;
642 int rc;
643 u16 pci_reg;
644
645 /* If we are able to access IOA PCI config space, alert IOA that we are
646 * going to reset it soon. This enables IOA to preserv persistent error
647 * data if any. In case memory space is not accessible, proceed with
648 * BIST or slot_reset
649 */
650 rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
651 if ((rc == PCIBIOS_SUCCESSFUL) && (pci_reg & PCI_COMMAND_MEMORY)) {
652
653 /* wait for IOA permission i.e until CRITICAL_OPERATION bit is
654 * reset IOA doesn't generate any interrupts when CRITICAL
655 * OPERATION bit is reset. A timer is started to wait for this
656 * bit to be reset.
657 */
658 cmd->time_left = PMCRAID_RESET_TIMEOUT;
659 cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
660 cmd->timer.function = pmcraid_reset_alert_done;
661 add_timer(&cmd->timer);
662
663 iowrite32(DOORBELL_IOA_RESET_ALERT,
664 pinstance->int_regs.host_ioa_interrupt_reg);
665 doorbells =
666 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
667 pmcraid_info("doorbells after reset alert: %x\n", doorbells);
668 } else {
669 pmcraid_info("PCI config is not accessible starting BIST\n");
670 pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
671 pmcraid_start_bist(cmd);
672 }
673}
674
675/**
676 * pmcraid_timeout_handler - Timeout handler for internally generated ops
677 *
678 * @t: pointer to command structure, that got timedout
679 *
680 * This function blocks host requests and initiates an adapter reset.
681 *
682 * Return value:
683 * None
684 */
685static void pmcraid_timeout_handler(struct timer_list *t)
686{
687 struct pmcraid_cmd *cmd = from_timer(cmd, t, timer);
688 struct pmcraid_instance *pinstance = cmd->drv_inst;
689 unsigned long lock_flags;
690
691 dev_info(&pinstance->pdev->dev,
692 "Adapter being reset due to cmd(CDB[0] = %x) timeout\n",
693 cmd->ioa_cb->ioarcb.cdb[0]);
694
695 /* Command timeouts result in hard reset sequence. The command that got
696 * timed out may be the one used as part of reset sequence. In this
697 * case restart reset sequence using the same command block even if
698 * reset is in progress. Otherwise fail this command and get a free
699 * command block to restart the reset sequence.
700 */
701 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
702 if (!pinstance->ioa_reset_in_progress) {
703 pinstance->ioa_reset_attempts = 0;
704 cmd = pmcraid_get_free_cmd(pinstance);
705
706 /* If we are out of command blocks, just return here itself.
707 * Some other command's timeout handler can do the reset job
708 */
709 if (cmd == NULL) {
710 spin_unlock_irqrestore(pinstance->host->host_lock,
711 lock_flags);
712 pmcraid_err("no free cmnd block for timeout handler\n");
713 return;
714 }
715
716 pinstance->reset_cmd = cmd;
717 pinstance->ioa_reset_in_progress = 1;
718 } else {
719 pmcraid_info("reset is already in progress\n");
720
721 if (pinstance->reset_cmd != cmd) {
722 /* This command should have been given to IOA, this
723 * command will be completed by fail_outstanding_cmds
724 * anyway
725 */
726 pmcraid_err("cmd is pending but reset in progress\n");
727 }
728
729 /* If this command was being used as part of the reset
730 * sequence, set cmd_done pointer to pmcraid_ioa_reset. This
731 * causes fail_outstanding_commands not to return the command
732 * block back to free pool
733 */
734 if (cmd == pinstance->reset_cmd)
735 cmd->cmd_done = pmcraid_ioa_reset;
736 }
737
738 /* Notify apps of important IOA bringup/bringdown sequences */
739 if (pinstance->scn.ioa_state != PMC_DEVICE_EVENT_RESET_START &&
740 pinstance->scn.ioa_state != PMC_DEVICE_EVENT_SHUTDOWN_START)
741 pmcraid_notify_ioastate(pinstance,
742 PMC_DEVICE_EVENT_RESET_START);
743
744 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
745 scsi_block_requests(pinstance->host);
746 pmcraid_reset_alert(cmd);
747 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
748}
749
750/**
751 * pmcraid_internal_done - completion routine for internally generated cmds
752 *
753 * @cmd: command that got response from IOA
754 *
755 * Return Value:
756 * none
757 */
758static void pmcraid_internal_done(struct pmcraid_cmd *cmd)
759{
760 pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
761 cmd->ioa_cb->ioarcb.cdb[0],
762 le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
763
764 /* Some of the internal commands are sent with callers blocking for the
765 * response. Same will be indicated as part of cmd->completion_req
766 * field. Response path needs to wake up any waiters waiting for cmd
767 * completion if this flag is set.
768 */
769 if (cmd->completion_req) {
770 cmd->completion_req = 0;
771 complete(&cmd->wait_for_completion);
772 }
773
774 /* most of the internal commands are completed by caller itself, so
775 * no need to return the command block back to free pool until we are
776 * required to do so (e.g once done with initialization).
777 */
778 if (cmd->release) {
779 cmd->release = 0;
780 pmcraid_return_cmd(cmd);
781 }
782}
783
784/**
785 * pmcraid_reinit_cfgtable_done - done function for cfg table reinitialization
786 *
787 * @cmd: command that got response from IOA
788 *
789 * This routine is called after driver re-reads configuration table due to a
790 * lost CCN. It returns the command block back to free pool and schedules
791 * worker thread to add/delete devices into the system.
792 *
793 * Return Value:
794 * none
795 */
796static void pmcraid_reinit_cfgtable_done(struct pmcraid_cmd *cmd)
797{
798 pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
799 cmd->ioa_cb->ioarcb.cdb[0],
800 le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
801
802 if (cmd->release) {
803 cmd->release = 0;
804 pmcraid_return_cmd(cmd);
805 }
806 pmcraid_info("scheduling worker for config table reinitialization\n");
807 schedule_work(&cmd->drv_inst->worker_q);
808}
809
810/**
811 * pmcraid_erp_done - Process completion of SCSI error response from device
812 * @cmd: pmcraid_command
813 *
814 * This function copies the sense buffer into the scsi_cmd struct and completes
815 * scsi_cmd by calling scsi_done function.
816 *
817 * Return value:
818 * none
819 */
820static void pmcraid_erp_done(struct pmcraid_cmd *cmd)
821{
822 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
823 struct pmcraid_instance *pinstance = cmd->drv_inst;
824 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
825
826 if (PMCRAID_IOASC_SENSE_KEY(ioasc) > 0) {
827 scsi_cmd->result |= (DID_ERROR << 16);
828 scmd_printk(KERN_INFO, scsi_cmd,
829 "command CDB[0] = %x failed with IOASC: 0x%08X\n",
830 cmd->ioa_cb->ioarcb.cdb[0], ioasc);
831 }
832
833 if (cmd->sense_buffer) {
834 dma_unmap_single(&pinstance->pdev->dev, cmd->sense_buffer_dma,
835 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
836 cmd->sense_buffer = NULL;
837 cmd->sense_buffer_dma = 0;
838 }
839
840 scsi_dma_unmap(scsi_cmd);
841 pmcraid_return_cmd(cmd);
842 scsi_done(scsi_cmd);
843}
844
845/**
846 * _pmcraid_fire_command - sends an IOA command to adapter
847 *
848 * This function adds the given block into pending command list
849 * and returns without waiting
850 *
851 * @cmd : command to be sent to the device
852 *
853 * Return Value
854 * None
855 */
856static void _pmcraid_fire_command(struct pmcraid_cmd *cmd)
857{
858 struct pmcraid_instance *pinstance = cmd->drv_inst;
859 unsigned long lock_flags;
860
861 /* Add this command block to pending cmd pool. We do this prior to
862 * writting IOARCB to ioarrin because IOA might complete the command
863 * by the time we are about to add it to the list. Response handler
864 * (isr/tasklet) looks for cmd block in the pending pending list.
865 */
866 spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
867 list_add_tail(&cmd->free_list, &pinstance->pending_cmd_pool);
868 spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
869 atomic_inc(&pinstance->outstanding_cmds);
870
871 /* driver writes lower 32-bit value of IOARCB address only */
872 mb();
873 iowrite32(le64_to_cpu(cmd->ioa_cb->ioarcb.ioarcb_bus_addr), pinstance->ioarrin);
874}
875
876/**
877 * pmcraid_send_cmd - fires a command to IOA
878 *
879 * This function also sets up timeout function, and command completion
880 * function
881 *
882 * @cmd: pointer to the command block to be fired to IOA
883 * @cmd_done: command completion function, called once IOA responds
884 * @timeout: timeout to wait for this command completion
885 * @timeout_func: timeout handler
886 *
887 * Return value
888 * none
889 */
890static void pmcraid_send_cmd(
891 struct pmcraid_cmd *cmd,
892 void (*cmd_done) (struct pmcraid_cmd *),
893 unsigned long timeout,
894 void (*timeout_func) (struct timer_list *)
895)
896{
897 /* initialize done function */
898 cmd->cmd_done = cmd_done;
899
900 if (timeout_func) {
901 /* setup timeout handler */
902 cmd->timer.expires = jiffies + timeout;
903 cmd->timer.function = timeout_func;
904 add_timer(&cmd->timer);
905 }
906
907 /* fire the command to IOA */
908 _pmcraid_fire_command(cmd);
909}
910
911/**
912 * pmcraid_ioa_shutdown_done - completion function for IOA shutdown command
913 * @cmd: pointer to the command block used for sending IOA shutdown command
914 *
915 * Return value
916 * None
917 */
918static void pmcraid_ioa_shutdown_done(struct pmcraid_cmd *cmd)
919{
920 struct pmcraid_instance *pinstance = cmd->drv_inst;
921 unsigned long lock_flags;
922
923 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
924 pmcraid_ioa_reset(cmd);
925 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
926}
927
928/**
929 * pmcraid_ioa_shutdown - sends SHUTDOWN command to ioa
930 *
931 * @cmd: pointer to the command block used as part of reset sequence
932 *
933 * Return Value
934 * None
935 */
936static void pmcraid_ioa_shutdown(struct pmcraid_cmd *cmd)
937{
938 pmcraid_info("response for Cancel CCN CDB[0] = %x ioasc = %x\n",
939 cmd->ioa_cb->ioarcb.cdb[0],
940 le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
941
942 /* Note that commands sent during reset require next command to be sent
943 * to IOA. Hence reinit the done function as well as timeout function
944 */
945 pmcraid_reinit_cmdblk(cmd);
946 cmd->ioa_cb->ioarcb.request_type = REQ_TYPE_IOACMD;
947 cmd->ioa_cb->ioarcb.resource_handle =
948 cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
949 cmd->ioa_cb->ioarcb.cdb[0] = PMCRAID_IOA_SHUTDOWN;
950 cmd->ioa_cb->ioarcb.cdb[1] = PMCRAID_SHUTDOWN_NORMAL;
951
952 /* fire shutdown command to hardware. */
953 pmcraid_info("firing normal shutdown command (%d) to IOA\n",
954 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle));
955
956 pmcraid_notify_ioastate(cmd->drv_inst, PMC_DEVICE_EVENT_SHUTDOWN_START);
957
958 pmcraid_send_cmd(cmd, pmcraid_ioa_shutdown_done,
959 PMCRAID_SHUTDOWN_TIMEOUT,
960 pmcraid_timeout_handler);
961}
962
963static void pmcraid_querycfg(struct pmcraid_cmd *);
964/**
965 * pmcraid_get_fwversion_done - completion function for get_fwversion
966 *
967 * @cmd: pointer to command block used to send INQUIRY command
968 *
969 * Return Value
970 * none
971 */
972static void pmcraid_get_fwversion_done(struct pmcraid_cmd *cmd)
973{
974 struct pmcraid_instance *pinstance = cmd->drv_inst;
975 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
976 unsigned long lock_flags;
977
978 /* configuration table entry size depends on firmware version. If fw
979 * version is not known, it is not possible to interpret IOA config
980 * table
981 */
982 if (ioasc) {
983 pmcraid_err("IOA Inquiry failed with %x\n", ioasc);
984 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
985 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
986 pmcraid_reset_alert(cmd);
987 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
988 } else {
989 pmcraid_querycfg(cmd);
990 }
991}
992
993/**
994 * pmcraid_get_fwversion - reads firmware version information
995 *
996 * @cmd: pointer to command block used to send INQUIRY command
997 *
998 * Return Value
999 * none
1000 */
1001static void pmcraid_get_fwversion(struct pmcraid_cmd *cmd)
1002{
1003 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1004 struct pmcraid_ioadl_desc *ioadl;
1005 struct pmcraid_instance *pinstance = cmd->drv_inst;
1006 u16 data_size = sizeof(struct pmcraid_inquiry_data);
1007
1008 pmcraid_reinit_cmdblk(cmd);
1009 ioarcb->request_type = REQ_TYPE_SCSI;
1010 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1011 ioarcb->cdb[0] = INQUIRY;
1012 ioarcb->cdb[1] = 1;
1013 ioarcb->cdb[2] = 0xD0;
1014 ioarcb->cdb[3] = (data_size >> 8) & 0xFF;
1015 ioarcb->cdb[4] = data_size & 0xFF;
1016
1017 /* Since entire inquiry data it can be part of IOARCB itself
1018 */
1019 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
1020 offsetof(struct pmcraid_ioarcb,
1021 add_data.u.ioadl[0]));
1022 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
1023 ioarcb->ioarcb_bus_addr &= cpu_to_le64(~(0x1FULL));
1024
1025 ioarcb->request_flags0 |= NO_LINK_DESCS;
1026 ioarcb->data_transfer_length = cpu_to_le32(data_size);
1027 ioadl = &(ioarcb->add_data.u.ioadl[0]);
1028 ioadl->flags = IOADL_FLAGS_LAST_DESC;
1029 ioadl->address = cpu_to_le64(pinstance->inq_data_baddr);
1030 ioadl->data_len = cpu_to_le32(data_size);
1031
1032 pmcraid_send_cmd(cmd, pmcraid_get_fwversion_done,
1033 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
1034}
1035
1036/**
1037 * pmcraid_identify_hrrq - registers host rrq buffers with IOA
1038 * @cmd: pointer to command block to be used for identify hrrq
1039 *
1040 * Return Value
1041 * none
1042 */
1043static void pmcraid_identify_hrrq(struct pmcraid_cmd *cmd)
1044{
1045 struct pmcraid_instance *pinstance = cmd->drv_inst;
1046 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1047 int index = cmd->hrrq_index;
1048 __be64 hrrq_addr = cpu_to_be64(pinstance->hrrq_start_bus_addr[index]);
1049 __be32 hrrq_size = cpu_to_be32(sizeof(u32) * PMCRAID_MAX_CMD);
1050 void (*done_function)(struct pmcraid_cmd *);
1051
1052 pmcraid_reinit_cmdblk(cmd);
1053 cmd->hrrq_index = index + 1;
1054
1055 if (cmd->hrrq_index < pinstance->num_hrrq) {
1056 done_function = pmcraid_identify_hrrq;
1057 } else {
1058 cmd->hrrq_index = 0;
1059 done_function = pmcraid_get_fwversion;
1060 }
1061
1062 /* Initialize ioarcb */
1063 ioarcb->request_type = REQ_TYPE_IOACMD;
1064 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1065
1066 /* initialize the hrrq number where IOA will respond to this command */
1067 ioarcb->hrrq_id = index;
1068 ioarcb->cdb[0] = PMCRAID_IDENTIFY_HRRQ;
1069 ioarcb->cdb[1] = index;
1070
1071 /* IOA expects 64-bit pci address to be written in B.E format
1072 * (i.e cdb[2]=MSByte..cdb[9]=LSB.
1073 */
1074 pmcraid_info("HRRQ_IDENTIFY with hrrq:ioarcb:index => %llx:%llx:%x\n",
1075 hrrq_addr, ioarcb->ioarcb_bus_addr, index);
1076
1077 memcpy(&(ioarcb->cdb[2]), &hrrq_addr, sizeof(hrrq_addr));
1078 memcpy(&(ioarcb->cdb[10]), &hrrq_size, sizeof(hrrq_size));
1079
1080 /* Subsequent commands require HRRQ identification to be successful.
1081 * Note that this gets called even during reset from SCSI mid-layer
1082 * or tasklet
1083 */
1084 pmcraid_send_cmd(cmd, done_function,
1085 PMCRAID_INTERNAL_TIMEOUT,
1086 pmcraid_timeout_handler);
1087}
1088
1089static void pmcraid_process_ccn(struct pmcraid_cmd *cmd);
1090static void pmcraid_process_ldn(struct pmcraid_cmd *cmd);
1091
1092/**
1093 * pmcraid_send_hcam_cmd - send an initialized command block(HCAM) to IOA
1094 *
1095 * @cmd: initialized command block pointer
1096 *
1097 * Return Value
1098 * none
1099 */
1100static void pmcraid_send_hcam_cmd(struct pmcraid_cmd *cmd)
1101{
1102 if (cmd->ioa_cb->ioarcb.cdb[1] == PMCRAID_HCAM_CODE_CONFIG_CHANGE)
1103 atomic_set(&(cmd->drv_inst->ccn.ignore), 0);
1104 else
1105 atomic_set(&(cmd->drv_inst->ldn.ignore), 0);
1106
1107 pmcraid_send_cmd(cmd, cmd->cmd_done, 0, NULL);
1108}
1109
1110/**
1111 * pmcraid_init_hcam - send an initialized command block(HCAM) to IOA
1112 *
1113 * @pinstance: pointer to adapter instance structure
1114 * @type: HCAM type
1115 *
1116 * Return Value
1117 * pointer to initialized pmcraid_cmd structure or NULL
1118 */
1119static struct pmcraid_cmd *pmcraid_init_hcam
1120(
1121 struct pmcraid_instance *pinstance,
1122 u8 type
1123)
1124{
1125 struct pmcraid_cmd *cmd;
1126 struct pmcraid_ioarcb *ioarcb;
1127 struct pmcraid_ioadl_desc *ioadl;
1128 struct pmcraid_hostrcb *hcam;
1129 void (*cmd_done) (struct pmcraid_cmd *);
1130 dma_addr_t dma;
1131 int rcb_size;
1132
1133 cmd = pmcraid_get_free_cmd(pinstance);
1134
1135 if (!cmd) {
1136 pmcraid_err("no free command blocks for hcam\n");
1137 return cmd;
1138 }
1139
1140 if (type == PMCRAID_HCAM_CODE_CONFIG_CHANGE) {
1141 rcb_size = sizeof(struct pmcraid_hcam_ccn_ext);
1142 cmd_done = pmcraid_process_ccn;
1143 dma = pinstance->ccn.baddr + PMCRAID_AEN_HDR_SIZE;
1144 hcam = &pinstance->ccn;
1145 } else {
1146 rcb_size = sizeof(struct pmcraid_hcam_ldn);
1147 cmd_done = pmcraid_process_ldn;
1148 dma = pinstance->ldn.baddr + PMCRAID_AEN_HDR_SIZE;
1149 hcam = &pinstance->ldn;
1150 }
1151
1152 /* initialize command pointer used for HCAM registration */
1153 hcam->cmd = cmd;
1154
1155 ioarcb = &cmd->ioa_cb->ioarcb;
1156 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
1157 offsetof(struct pmcraid_ioarcb,
1158 add_data.u.ioadl[0]));
1159 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
1160 ioadl = ioarcb->add_data.u.ioadl;
1161
1162 /* Initialize ioarcb */
1163 ioarcb->request_type = REQ_TYPE_HCAM;
1164 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1165 ioarcb->cdb[0] = PMCRAID_HOST_CONTROLLED_ASYNC;
1166 ioarcb->cdb[1] = type;
1167 ioarcb->cdb[7] = (rcb_size >> 8) & 0xFF;
1168 ioarcb->cdb[8] = (rcb_size) & 0xFF;
1169
1170 ioarcb->data_transfer_length = cpu_to_le32(rcb_size);
1171
1172 ioadl[0].flags |= IOADL_FLAGS_READ_LAST;
1173 ioadl[0].data_len = cpu_to_le32(rcb_size);
1174 ioadl[0].address = cpu_to_le64(dma);
1175
1176 cmd->cmd_done = cmd_done;
1177 return cmd;
1178}
1179
1180/**
1181 * pmcraid_send_hcam - Send an HCAM to IOA
1182 * @pinstance: ioa config struct
1183 * @type: HCAM type
1184 *
1185 * This function will send a Host Controlled Async command to IOA.
1186 *
1187 * Return value:
1188 * none
1189 */
1190static void pmcraid_send_hcam(struct pmcraid_instance *pinstance, u8 type)
1191{
1192 struct pmcraid_cmd *cmd = pmcraid_init_hcam(pinstance, type);
1193 pmcraid_send_hcam_cmd(cmd);
1194}
1195
1196
1197/**
1198 * pmcraid_prepare_cancel_cmd - prepares a command block to abort another
1199 *
1200 * @cmd: pointer to cmd that is used as cancelling command
1201 * @cmd_to_cancel: pointer to the command that needs to be cancelled
1202 */
1203static void pmcraid_prepare_cancel_cmd(
1204 struct pmcraid_cmd *cmd,
1205 struct pmcraid_cmd *cmd_to_cancel
1206)
1207{
1208 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1209 __be64 ioarcb_addr;
1210
1211 /* IOARCB address of the command to be cancelled is given in
1212 * cdb[2]..cdb[9] is Big-Endian format. Note that length bits in
1213 * IOARCB address are not masked.
1214 */
1215 ioarcb_addr = cpu_to_be64(le64_to_cpu(cmd_to_cancel->ioa_cb->ioarcb.ioarcb_bus_addr));
1216
1217 /* Get the resource handle to where the command to be aborted has been
1218 * sent.
1219 */
1220 ioarcb->resource_handle = cmd_to_cancel->ioa_cb->ioarcb.resource_handle;
1221 ioarcb->request_type = REQ_TYPE_IOACMD;
1222 memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
1223 ioarcb->cdb[0] = PMCRAID_ABORT_CMD;
1224
1225 memcpy(&(ioarcb->cdb[2]), &ioarcb_addr, sizeof(ioarcb_addr));
1226}
1227
1228/**
1229 * pmcraid_cancel_hcam - sends ABORT task to abort a given HCAM
1230 *
1231 * @cmd: command to be used as cancelling command
1232 * @type: HCAM type
1233 * @cmd_done: op done function for the cancelling command
1234 */
1235static void pmcraid_cancel_hcam(
1236 struct pmcraid_cmd *cmd,
1237 u8 type,
1238 void (*cmd_done) (struct pmcraid_cmd *)
1239)
1240{
1241 struct pmcraid_instance *pinstance;
1242 struct pmcraid_hostrcb *hcam;
1243
1244 pinstance = cmd->drv_inst;
1245 hcam = (type == PMCRAID_HCAM_CODE_LOG_DATA) ?
1246 &pinstance->ldn : &pinstance->ccn;
1247
1248 /* prepare for cancelling previous hcam command. If the HCAM is
1249 * currently not pending with IOA, we would have hcam->cmd as non-null
1250 */
1251 if (hcam->cmd == NULL)
1252 return;
1253
1254 pmcraid_prepare_cancel_cmd(cmd, hcam->cmd);
1255
1256 /* writing to IOARRIN must be protected by host_lock, as mid-layer
1257 * schedule queuecommand while we are doing this
1258 */
1259 pmcraid_send_cmd(cmd, cmd_done,
1260 PMCRAID_INTERNAL_TIMEOUT,
1261 pmcraid_timeout_handler);
1262}
1263
1264/**
1265 * pmcraid_cancel_ccn - cancel CCN HCAM already registered with IOA
1266 *
1267 * @cmd: command block to be used for cancelling the HCAM
1268 */
1269static void pmcraid_cancel_ccn(struct pmcraid_cmd *cmd)
1270{
1271 pmcraid_info("response for Cancel LDN CDB[0] = %x ioasc = %x\n",
1272 cmd->ioa_cb->ioarcb.cdb[0],
1273 le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
1274
1275 pmcraid_reinit_cmdblk(cmd);
1276
1277 pmcraid_cancel_hcam(cmd,
1278 PMCRAID_HCAM_CODE_CONFIG_CHANGE,
1279 pmcraid_ioa_shutdown);
1280}
1281
1282/**
1283 * pmcraid_cancel_ldn - cancel LDN HCAM already registered with IOA
1284 *
1285 * @cmd: command block to be used for cancelling the HCAM
1286 */
1287static void pmcraid_cancel_ldn(struct pmcraid_cmd *cmd)
1288{
1289 pmcraid_cancel_hcam(cmd,
1290 PMCRAID_HCAM_CODE_LOG_DATA,
1291 pmcraid_cancel_ccn);
1292}
1293
1294/**
1295 * pmcraid_expose_resource - check if the resource can be exposed to OS
1296 *
1297 * @fw_version: firmware version code
1298 * @cfgte: pointer to configuration table entry of the resource
1299 *
1300 * Return value:
1301 * true if resource can be added to midlayer, false(0) otherwise
1302 */
1303static int pmcraid_expose_resource(u16 fw_version,
1304 struct pmcraid_config_table_entry *cfgte)
1305{
1306 int retval = 0;
1307
1308 if (cfgte->resource_type == RES_TYPE_VSET) {
1309 if (fw_version <= PMCRAID_FW_VERSION_1)
1310 retval = ((cfgte->unique_flags1 & 0x80) == 0);
1311 else
1312 retval = ((cfgte->unique_flags0 & 0x80) == 0 &&
1313 (cfgte->unique_flags1 & 0x80) == 0);
1314
1315 } else if (cfgte->resource_type == RES_TYPE_GSCSI)
1316 retval = (RES_BUS(cfgte->resource_address) !=
1317 PMCRAID_VIRTUAL_ENCL_BUS_ID);
1318 return retval;
1319}
1320
1321/* attributes supported by pmcraid_event_family */
1322enum {
1323 PMCRAID_AEN_ATTR_UNSPEC,
1324 PMCRAID_AEN_ATTR_EVENT,
1325 __PMCRAID_AEN_ATTR_MAX,
1326};
1327#define PMCRAID_AEN_ATTR_MAX (__PMCRAID_AEN_ATTR_MAX - 1)
1328
1329/* commands supported by pmcraid_event_family */
1330enum {
1331 PMCRAID_AEN_CMD_UNSPEC,
1332 PMCRAID_AEN_CMD_EVENT,
1333 __PMCRAID_AEN_CMD_MAX,
1334};
1335#define PMCRAID_AEN_CMD_MAX (__PMCRAID_AEN_CMD_MAX - 1)
1336
1337static struct genl_multicast_group pmcraid_mcgrps[] = {
1338 { .name = "events", /* not really used - see ID discussion below */ },
1339};
1340
1341static struct genl_family pmcraid_event_family __ro_after_init = {
1342 .module = THIS_MODULE,
1343 .name = "pmcraid",
1344 .version = 1,
1345 .maxattr = PMCRAID_AEN_ATTR_MAX,
1346 .mcgrps = pmcraid_mcgrps,
1347 .n_mcgrps = ARRAY_SIZE(pmcraid_mcgrps),
1348};
1349
1350/**
1351 * pmcraid_netlink_init - registers pmcraid_event_family
1352 *
1353 * Return value:
1354 * 0 if the pmcraid_event_family is successfully registered
1355 * with netlink generic, non-zero otherwise
1356 */
1357static int __init pmcraid_netlink_init(void)
1358{
1359 int result;
1360
1361 result = genl_register_family(&pmcraid_event_family);
1362
1363 if (result)
1364 return result;
1365
1366 pmcraid_info("registered NETLINK GENERIC group: %d\n",
1367 pmcraid_event_family.id);
1368
1369 return result;
1370}
1371
1372/**
1373 * pmcraid_netlink_release - unregisters pmcraid_event_family
1374 *
1375 * Return value:
1376 * none
1377 */
1378static void pmcraid_netlink_release(void)
1379{
1380 genl_unregister_family(&pmcraid_event_family);
1381}
1382
1383/*
1384 * pmcraid_notify_aen - sends event msg to user space application
1385 * @pinstance: pointer to adapter instance structure
1386 *
1387 * Return value:
1388 * 0 if success, error value in case of any failure.
1389 */
1390static int pmcraid_notify_aen(
1391 struct pmcraid_instance *pinstance,
1392 struct pmcraid_aen_msg *aen_msg,
1393 u32 data_size)
1394{
1395 struct sk_buff *skb;
1396 void *msg_header;
1397 u32 total_size, nla_genl_hdr_total_size;
1398 int result;
1399
1400 aen_msg->hostno = (pinstance->host->unique_id << 16 |
1401 MINOR(pinstance->cdev.dev));
1402 aen_msg->length = data_size;
1403
1404 data_size += sizeof(*aen_msg);
1405
1406 total_size = nla_total_size(data_size);
1407 /* Add GENL_HDR to total_size */
1408 nla_genl_hdr_total_size =
1409 (total_size + (GENL_HDRLEN +
1410 ((struct genl_family *)&pmcraid_event_family)->hdrsize)
1411 + NLMSG_HDRLEN);
1412 skb = genlmsg_new(nla_genl_hdr_total_size, GFP_ATOMIC);
1413
1414
1415 if (!skb) {
1416 pmcraid_err("Failed to allocate aen data SKB of size: %x\n",
1417 total_size);
1418 return -ENOMEM;
1419 }
1420
1421 /* add the genetlink message header */
1422 msg_header = genlmsg_put(skb, 0, 0,
1423 &pmcraid_event_family, 0,
1424 PMCRAID_AEN_CMD_EVENT);
1425 if (!msg_header) {
1426 pmcraid_err("failed to copy command details\n");
1427 nlmsg_free(skb);
1428 return -ENOMEM;
1429 }
1430
1431 result = nla_put(skb, PMCRAID_AEN_ATTR_EVENT, data_size, aen_msg);
1432
1433 if (result) {
1434 pmcraid_err("failed to copy AEN attribute data\n");
1435 nlmsg_free(skb);
1436 return -EINVAL;
1437 }
1438
1439 /* send genetlink multicast message to notify applications */
1440 genlmsg_end(skb, msg_header);
1441
1442 result = genlmsg_multicast(&pmcraid_event_family, skb,
1443 0, 0, GFP_ATOMIC);
1444
1445 /* If there are no listeners, genlmsg_multicast may return non-zero
1446 * value.
1447 */
1448 if (result)
1449 pmcraid_info("error (%x) sending aen event message\n", result);
1450 return result;
1451}
1452
1453/**
1454 * pmcraid_notify_ccn - notifies about CCN event msg to user space
1455 * @pinstance: pointer adapter instance structure
1456 *
1457 * Return value:
1458 * 0 if success, error value in case of any failure
1459 */
1460static int pmcraid_notify_ccn(struct pmcraid_instance *pinstance)
1461{
1462 return pmcraid_notify_aen(pinstance,
1463 pinstance->ccn.msg,
1464 le32_to_cpu(pinstance->ccn.hcam->data_len) +
1465 sizeof(struct pmcraid_hcam_hdr));
1466}
1467
1468/**
1469 * pmcraid_notify_ldn - notifies about CCN event msg to user space
1470 * @pinstance: pointer adapter instance structure
1471 *
1472 * Return value:
1473 * 0 if success, error value in case of any failure
1474 */
1475static int pmcraid_notify_ldn(struct pmcraid_instance *pinstance)
1476{
1477 return pmcraid_notify_aen(pinstance,
1478 pinstance->ldn.msg,
1479 le32_to_cpu(pinstance->ldn.hcam->data_len) +
1480 sizeof(struct pmcraid_hcam_hdr));
1481}
1482
1483/**
1484 * pmcraid_notify_ioastate - sends IOA state event msg to user space
1485 * @pinstance: pointer adapter instance structure
1486 * @evt: controller state event to be sent
1487 *
1488 * Return value:
1489 * 0 if success, error value in case of any failure
1490 */
1491static void pmcraid_notify_ioastate(struct pmcraid_instance *pinstance, u32 evt)
1492{
1493 pinstance->scn.ioa_state = evt;
1494 pmcraid_notify_aen(pinstance,
1495 &pinstance->scn.msg,
1496 sizeof(u32));
1497}
1498
1499/**
1500 * pmcraid_handle_config_change - Handle a config change from the adapter
1501 * @pinstance: pointer to per adapter instance structure
1502 *
1503 * Return value:
1504 * none
1505 */
1506
1507static void pmcraid_handle_config_change(struct pmcraid_instance *pinstance)
1508{
1509 struct pmcraid_config_table_entry *cfg_entry;
1510 struct pmcraid_hcam_ccn *ccn_hcam;
1511 struct pmcraid_cmd *cmd;
1512 struct pmcraid_cmd *cfgcmd;
1513 struct pmcraid_resource_entry *res = NULL;
1514 unsigned long lock_flags;
1515 unsigned long host_lock_flags;
1516 u32 new_entry = 1;
1517 u32 hidden_entry = 0;
1518 u16 fw_version;
1519 int rc;
1520
1521 ccn_hcam = (struct pmcraid_hcam_ccn *)pinstance->ccn.hcam;
1522 cfg_entry = &ccn_hcam->cfg_entry;
1523 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
1524
1525 pmcraid_info("CCN(%x): %x timestamp: %llx type: %x lost: %x flags: %x \
1526 res: %x:%x:%x:%x\n",
1527 le32_to_cpu(pinstance->ccn.hcam->ilid),
1528 pinstance->ccn.hcam->op_code,
1529 (le32_to_cpu(pinstance->ccn.hcam->timestamp1) |
1530 ((le32_to_cpu(pinstance->ccn.hcam->timestamp2) & 0xffffffffLL) << 32)),
1531 pinstance->ccn.hcam->notification_type,
1532 pinstance->ccn.hcam->notification_lost,
1533 pinstance->ccn.hcam->flags,
1534 pinstance->host->unique_id,
1535 RES_IS_VSET(*cfg_entry) ? PMCRAID_VSET_BUS_ID :
1536 (RES_IS_GSCSI(*cfg_entry) ? PMCRAID_PHYS_BUS_ID :
1537 RES_BUS(cfg_entry->resource_address)),
1538 RES_IS_VSET(*cfg_entry) ?
1539 (fw_version <= PMCRAID_FW_VERSION_1 ?
1540 cfg_entry->unique_flags1 :
1541 le16_to_cpu(cfg_entry->array_id) & 0xFF) :
1542 RES_TARGET(cfg_entry->resource_address),
1543 RES_LUN(cfg_entry->resource_address));
1544
1545
1546 /* If this HCAM indicates a lost notification, read the config table */
1547 if (pinstance->ccn.hcam->notification_lost) {
1548 cfgcmd = pmcraid_get_free_cmd(pinstance);
1549 if (cfgcmd) {
1550 pmcraid_info("lost CCN, reading config table\b");
1551 pinstance->reinit_cfg_table = 1;
1552 pmcraid_querycfg(cfgcmd);
1553 } else {
1554 pmcraid_err("lost CCN, no free cmd for querycfg\n");
1555 }
1556 goto out_notify_apps;
1557 }
1558
1559 /* If this resource is not going to be added to mid-layer, just notify
1560 * applications and return. If this notification is about hiding a VSET
1561 * resource, check if it was exposed already.
1562 */
1563 if (pinstance->ccn.hcam->notification_type ==
1564 NOTIFICATION_TYPE_ENTRY_CHANGED &&
1565 cfg_entry->resource_type == RES_TYPE_VSET) {
1566 hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;
1567 } else if (!pmcraid_expose_resource(fw_version, cfg_entry)) {
1568 goto out_notify_apps;
1569 }
1570
1571 spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
1572 list_for_each_entry(res, &pinstance->used_res_q, queue) {
1573 rc = memcmp(&res->cfg_entry.resource_address,
1574 &cfg_entry->resource_address,
1575 sizeof(cfg_entry->resource_address));
1576 if (!rc) {
1577 new_entry = 0;
1578 break;
1579 }
1580 }
1581
1582 if (new_entry) {
1583
1584 if (hidden_entry) {
1585 spin_unlock_irqrestore(&pinstance->resource_lock,
1586 lock_flags);
1587 goto out_notify_apps;
1588 }
1589
1590 /* If there are more number of resources than what driver can
1591 * manage, do not notify the applications about the CCN. Just
1592 * ignore this notifications and re-register the same HCAM
1593 */
1594 if (list_empty(&pinstance->free_res_q)) {
1595 spin_unlock_irqrestore(&pinstance->resource_lock,
1596 lock_flags);
1597 pmcraid_err("too many resources attached\n");
1598 spin_lock_irqsave(pinstance->host->host_lock,
1599 host_lock_flags);
1600 pmcraid_send_hcam(pinstance,
1601 PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1602 spin_unlock_irqrestore(pinstance->host->host_lock,
1603 host_lock_flags);
1604 return;
1605 }
1606
1607 res = list_entry(pinstance->free_res_q.next,
1608 struct pmcraid_resource_entry, queue);
1609
1610 list_del(&res->queue);
1611 res->scsi_dev = NULL;
1612 res->reset_progress = 0;
1613 list_add_tail(&res->queue, &pinstance->used_res_q);
1614 }
1615
1616 memcpy(&res->cfg_entry, cfg_entry, pinstance->config_table_entry_size);
1617
1618 if (pinstance->ccn.hcam->notification_type ==
1619 NOTIFICATION_TYPE_ENTRY_DELETED || hidden_entry) {
1620 if (res->scsi_dev) {
1621 if (fw_version <= PMCRAID_FW_VERSION_1)
1622 res->cfg_entry.unique_flags1 &= 0x7F;
1623 else
1624 res->cfg_entry.array_id &= cpu_to_le16(0xFF);
1625 res->change_detected = RES_CHANGE_DEL;
1626 res->cfg_entry.resource_handle =
1627 PMCRAID_INVALID_RES_HANDLE;
1628 schedule_work(&pinstance->worker_q);
1629 } else {
1630 /* This may be one of the non-exposed resources */
1631 list_move_tail(&res->queue, &pinstance->free_res_q);
1632 }
1633 } else if (!res->scsi_dev) {
1634 res->change_detected = RES_CHANGE_ADD;
1635 schedule_work(&pinstance->worker_q);
1636 }
1637 spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
1638
1639out_notify_apps:
1640
1641 /* Notify configuration changes to registered applications.*/
1642 if (!pmcraid_disable_aen)
1643 pmcraid_notify_ccn(pinstance);
1644
1645 cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1646 if (cmd)
1647 pmcraid_send_hcam_cmd(cmd);
1648}
1649
1650/**
1651 * pmcraid_get_error_info - return error string for an ioasc
1652 * @ioasc: ioasc code
1653 * Return Value
1654 * none
1655 */
1656static struct pmcraid_ioasc_error *pmcraid_get_error_info(u32 ioasc)
1657{
1658 int i;
1659 for (i = 0; i < ARRAY_SIZE(pmcraid_ioasc_error_table); i++) {
1660 if (pmcraid_ioasc_error_table[i].ioasc_code == ioasc)
1661 return &pmcraid_ioasc_error_table[i];
1662 }
1663 return NULL;
1664}
1665
1666/**
1667 * pmcraid_ioasc_logger - log IOASC information based user-settings
1668 * @ioasc: ioasc code
1669 * @cmd: pointer to command that resulted in 'ioasc'
1670 */
1671static void pmcraid_ioasc_logger(u32 ioasc, struct pmcraid_cmd *cmd)
1672{
1673 struct pmcraid_ioasc_error *error_info = pmcraid_get_error_info(ioasc);
1674
1675 if (error_info == NULL ||
1676 cmd->drv_inst->current_log_level < error_info->log_level)
1677 return;
1678
1679 /* log the error string */
1680 pmcraid_err("cmd [%x] for resource %x failed with %x(%s)\n",
1681 cmd->ioa_cb->ioarcb.cdb[0],
1682 le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle),
1683 ioasc, error_info->error_string);
1684}
1685
1686/**
1687 * pmcraid_handle_error_log - Handle a config change (error log) from the IOA
1688 *
1689 * @pinstance: pointer to per adapter instance structure
1690 *
1691 * Return value:
1692 * none
1693 */
1694static void pmcraid_handle_error_log(struct pmcraid_instance *pinstance)
1695{
1696 struct pmcraid_hcam_ldn *hcam_ldn;
1697 u32 ioasc;
1698
1699 hcam_ldn = (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
1700
1701 pmcraid_info
1702 ("LDN(%x): %x type: %x lost: %x flags: %x overlay id: %x\n",
1703 pinstance->ldn.hcam->ilid,
1704 pinstance->ldn.hcam->op_code,
1705 pinstance->ldn.hcam->notification_type,
1706 pinstance->ldn.hcam->notification_lost,
1707 pinstance->ldn.hcam->flags,
1708 pinstance->ldn.hcam->overlay_id);
1709
1710 /* log only the errors, no need to log informational log entries */
1711 if (pinstance->ldn.hcam->notification_type !=
1712 NOTIFICATION_TYPE_ERROR_LOG)
1713 return;
1714
1715 if (pinstance->ldn.hcam->notification_lost ==
1716 HOSTRCB_NOTIFICATIONS_LOST)
1717 dev_info(&pinstance->pdev->dev, "Error notifications lost\n");
1718
1719 ioasc = le32_to_cpu(hcam_ldn->error_log.fd_ioasc);
1720
1721 if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
1722 ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER) {
1723 dev_info(&pinstance->pdev->dev,
1724 "UnitAttention due to IOA Bus Reset\n");
1725 scsi_report_bus_reset(
1726 pinstance->host,
1727 RES_BUS(hcam_ldn->error_log.fd_ra));
1728 }
1729
1730 return;
1731}
1732
1733/**
1734 * pmcraid_process_ccn - Op done function for a CCN.
1735 * @cmd: pointer to command struct
1736 *
1737 * This function is the op done function for a configuration
1738 * change notification
1739 *
1740 * Return value:
1741 * none
1742 */
1743static void pmcraid_process_ccn(struct pmcraid_cmd *cmd)
1744{
1745 struct pmcraid_instance *pinstance = cmd->drv_inst;
1746 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1747 unsigned long lock_flags;
1748
1749 pinstance->ccn.cmd = NULL;
1750 pmcraid_return_cmd(cmd);
1751
1752 /* If driver initiated IOA reset happened while this hcam was pending
1753 * with IOA, or IOA bringdown sequence is in progress, no need to
1754 * re-register the hcam
1755 */
1756 if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
1757 atomic_read(&pinstance->ccn.ignore) == 1) {
1758 return;
1759 } else if (ioasc) {
1760 dev_info(&pinstance->pdev->dev,
1761 "Host RCB (CCN) failed with IOASC: 0x%08X\n", ioasc);
1762 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
1763 pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1764 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
1765 } else {
1766 pmcraid_handle_config_change(pinstance);
1767 }
1768}
1769
1770static void pmcraid_initiate_reset(struct pmcraid_instance *);
1771static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd);
1772/**
1773 * pmcraid_process_ldn - op done function for an LDN
1774 * @cmd: pointer to command block
1775 *
1776 * Return value
1777 * none
1778 */
1779static void pmcraid_process_ldn(struct pmcraid_cmd *cmd)
1780{
1781 struct pmcraid_instance *pinstance = cmd->drv_inst;
1782 struct pmcraid_hcam_ldn *ldn_hcam =
1783 (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
1784 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1785 u32 fd_ioasc = le32_to_cpu(ldn_hcam->error_log.fd_ioasc);
1786 unsigned long lock_flags;
1787
1788 /* return the command block back to freepool */
1789 pinstance->ldn.cmd = NULL;
1790 pmcraid_return_cmd(cmd);
1791
1792 /* If driver initiated IOA reset happened while this hcam was pending
1793 * with IOA, no need to re-register the hcam as reset engine will do it
1794 * once reset sequence is complete
1795 */
1796 if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
1797 atomic_read(&pinstance->ccn.ignore) == 1) {
1798 return;
1799 } else if (!ioasc) {
1800 pmcraid_handle_error_log(pinstance);
1801 if (fd_ioasc == PMCRAID_IOASC_NR_IOA_RESET_REQUIRED) {
1802 spin_lock_irqsave(pinstance->host->host_lock,
1803 lock_flags);
1804 pmcraid_initiate_reset(pinstance);
1805 spin_unlock_irqrestore(pinstance->host->host_lock,
1806 lock_flags);
1807 return;
1808 }
1809 if (fd_ioasc == PMCRAID_IOASC_TIME_STAMP_OUT_OF_SYNC) {
1810 pinstance->timestamp_error = 1;
1811 pmcraid_set_timestamp(cmd);
1812 }
1813 } else {
1814 dev_info(&pinstance->pdev->dev,
1815 "Host RCB(LDN) failed with IOASC: 0x%08X\n", ioasc);
1816 }
1817 /* send netlink message for HCAM notification if enabled */
1818 if (!pmcraid_disable_aen)
1819 pmcraid_notify_ldn(pinstance);
1820
1821 cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
1822 if (cmd)
1823 pmcraid_send_hcam_cmd(cmd);
1824}
1825
1826/**
1827 * pmcraid_register_hcams - register HCAMs for CCN and LDN
1828 *
1829 * @pinstance: pointer per adapter instance structure
1830 *
1831 * Return Value
1832 * none
1833 */
1834static void pmcraid_register_hcams(struct pmcraid_instance *pinstance)
1835{
1836 pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1837 pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
1838}
1839
1840/**
1841 * pmcraid_unregister_hcams - cancel HCAMs registered already
1842 * @cmd: pointer to command used as part of reset sequence
1843 */
1844static void pmcraid_unregister_hcams(struct pmcraid_cmd *cmd)
1845{
1846 struct pmcraid_instance *pinstance = cmd->drv_inst;
1847
1848 /* During IOA bringdown, HCAM gets fired and tasklet proceeds with
1849 * handling hcam response though it is not necessary. In order to
1850 * prevent this, set 'ignore', so that bring-down sequence doesn't
1851 * re-send any more hcams
1852 */
1853 atomic_set(&pinstance->ccn.ignore, 1);
1854 atomic_set(&pinstance->ldn.ignore, 1);
1855
1856 /* If adapter reset was forced as part of runtime reset sequence,
1857 * start the reset sequence. Reset will be triggered even in case
1858 * IOA unit_check.
1859 */
1860 if ((pinstance->force_ioa_reset && !pinstance->ioa_bringdown) ||
1861 pinstance->ioa_unit_check) {
1862 pinstance->force_ioa_reset = 0;
1863 pinstance->ioa_unit_check = 0;
1864 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
1865 pmcraid_reset_alert(cmd);
1866 return;
1867 }
1868
1869 /* Driver tries to cancel HCAMs by sending ABORT TASK for each HCAM
1870 * one after the other. So CCN cancellation will be triggered by
1871 * pmcraid_cancel_ldn itself.
1872 */
1873 pmcraid_cancel_ldn(cmd);
1874}
1875
1876static void pmcraid_reinit_buffers(struct pmcraid_instance *);
1877
1878/**
1879 * pmcraid_reset_enable_ioa - re-enable IOA after a hard reset
1880 * @pinstance: pointer to adapter instance structure
1881 * Return Value
1882 * 1 if TRANSITION_TO_OPERATIONAL is active, otherwise 0
1883 */
1884static int pmcraid_reset_enable_ioa(struct pmcraid_instance *pinstance)
1885{
1886 u32 intrs;
1887
1888 pmcraid_reinit_buffers(pinstance);
1889 intrs = pmcraid_read_interrupts(pinstance);
1890
1891 pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
1892
1893 if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
1894 if (!pinstance->interrupt_mode) {
1895 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
1896 pinstance->int_regs.
1897 ioa_host_interrupt_mask_reg);
1898 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
1899 pinstance->int_regs.ioa_host_interrupt_clr_reg);
1900 }
1901 return 1;
1902 } else {
1903 return 0;
1904 }
1905}
1906
1907/**
1908 * pmcraid_soft_reset - performs a soft reset and makes IOA become ready
1909 * @cmd : pointer to reset command block
1910 *
1911 * Return Value
1912 * none
1913 */
1914static void pmcraid_soft_reset(struct pmcraid_cmd *cmd)
1915{
1916 struct pmcraid_instance *pinstance = cmd->drv_inst;
1917 u32 int_reg;
1918 u32 doorbell;
1919
1920 /* There will be an interrupt when Transition to Operational bit is
1921 * set so tasklet would execute next reset task. The timeout handler
1922 * would re-initiate a reset
1923 */
1924 cmd->cmd_done = pmcraid_ioa_reset;
1925 cmd->timer.expires = jiffies +
1926 msecs_to_jiffies(PMCRAID_TRANSOP_TIMEOUT);
1927 cmd->timer.function = pmcraid_timeout_handler;
1928
1929 if (!timer_pending(&cmd->timer))
1930 add_timer(&cmd->timer);
1931
1932 /* Enable destructive diagnostics on IOA if it is not yet in
1933 * operational state
1934 */
1935 doorbell = DOORBELL_RUNTIME_RESET |
1936 DOORBELL_ENABLE_DESTRUCTIVE_DIAGS;
1937
1938 /* Since we do RESET_ALERT and Start BIST we have to again write
1939 * MSIX Doorbell to indicate the interrupt mode
1940 */
1941 if (pinstance->interrupt_mode) {
1942 iowrite32(DOORBELL_INTR_MODE_MSIX,
1943 pinstance->int_regs.host_ioa_interrupt_reg);
1944 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
1945 }
1946
1947 iowrite32(doorbell, pinstance->int_regs.host_ioa_interrupt_reg);
1948 ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
1949 int_reg = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
1950
1951 pmcraid_info("Waiting for IOA to become operational %x:%x\n",
1952 ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
1953 int_reg);
1954}
1955
1956/**
1957 * pmcraid_get_dump - retrieves IOA dump in case of Unit Check interrupt
1958 *
1959 * @pinstance: pointer to adapter instance structure
1960 *
1961 * Return Value
1962 * none
1963 */
1964static void pmcraid_get_dump(struct pmcraid_instance *pinstance)
1965{
1966 pmcraid_info("%s is not yet implemented\n", __func__);
1967}
1968
1969/**
1970 * pmcraid_fail_outstanding_cmds - Fails all outstanding ops.
1971 * @pinstance: pointer to adapter instance structure
1972 *
1973 * This function fails all outstanding ops. If they are submitted to IOA
1974 * already, it sends cancel all messages if IOA is still accepting IOARCBs,
1975 * otherwise just completes the commands and returns the cmd blocks to free
1976 * pool.
1977 *
1978 * Return value:
1979 * none
1980 */
1981static void pmcraid_fail_outstanding_cmds(struct pmcraid_instance *pinstance)
1982{
1983 struct pmcraid_cmd *cmd, *temp;
1984 unsigned long lock_flags;
1985
1986 /* pending command list is protected by pending_pool_lock. Its
1987 * traversal must be done as within this lock
1988 */
1989 spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
1990 list_for_each_entry_safe(cmd, temp, &pinstance->pending_cmd_pool,
1991 free_list) {
1992 list_del(&cmd->free_list);
1993 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
1994 lock_flags);
1995 cmd->ioa_cb->ioasa.ioasc =
1996 cpu_to_le32(PMCRAID_IOASC_IOA_WAS_RESET);
1997 cmd->ioa_cb->ioasa.ilid =
1998 cpu_to_le32(PMCRAID_DRIVER_ILID);
1999
2000 /* In case the command timer is still running */
2001 del_timer(&cmd->timer);
2002
2003 /* If this is an IO command, complete it by invoking scsi_done
2004 * function. If this is one of the internal commands other
2005 * than pmcraid_ioa_reset and HCAM commands invoke cmd_done to
2006 * complete it
2007 */
2008 if (cmd->scsi_cmd) {
2009
2010 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2011 __le32 resp = cmd->ioa_cb->ioarcb.response_handle;
2012
2013 scsi_cmd->result |= DID_ERROR << 16;
2014
2015 scsi_dma_unmap(scsi_cmd);
2016 pmcraid_return_cmd(cmd);
2017
2018 pmcraid_info("failing(%d) CDB[0] = %x result: %x\n",
2019 le32_to_cpu(resp) >> 2,
2020 cmd->ioa_cb->ioarcb.cdb[0],
2021 scsi_cmd->result);
2022 scsi_done(scsi_cmd);
2023 } else if (cmd->cmd_done == pmcraid_internal_done ||
2024 cmd->cmd_done == pmcraid_erp_done) {
2025 cmd->cmd_done(cmd);
2026 } else if (cmd->cmd_done != pmcraid_ioa_reset &&
2027 cmd->cmd_done != pmcraid_ioa_shutdown_done) {
2028 pmcraid_return_cmd(cmd);
2029 }
2030
2031 atomic_dec(&pinstance->outstanding_cmds);
2032 spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
2033 }
2034
2035 spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
2036}
2037
2038/**
2039 * pmcraid_ioa_reset - Implementation of IOA reset logic
2040 *
2041 * @cmd: pointer to the cmd block to be used for entire reset process
2042 *
2043 * This function executes most of the steps required for IOA reset. This gets
2044 * called by user threads (modprobe/insmod/rmmod) timer, tasklet and midlayer's
2045 * 'eh_' thread. Access to variables used for controlling the reset sequence is
2046 * synchronized using host lock. Various functions called during reset process
2047 * would make use of a single command block, pointer to which is also stored in
2048 * adapter instance structure.
2049 *
2050 * Return Value
2051 * None
2052 */
2053static void pmcraid_ioa_reset(struct pmcraid_cmd *cmd)
2054{
2055 struct pmcraid_instance *pinstance = cmd->drv_inst;
2056 u8 reset_complete = 0;
2057
2058 pinstance->ioa_reset_in_progress = 1;
2059
2060 if (pinstance->reset_cmd != cmd) {
2061 pmcraid_err("reset is called with different command block\n");
2062 pinstance->reset_cmd = cmd;
2063 }
2064
2065 pmcraid_info("reset_engine: state = %d, command = %p\n",
2066 pinstance->ioa_state, cmd);
2067
2068 switch (pinstance->ioa_state) {
2069
2070 case IOA_STATE_DEAD:
2071 /* If IOA is offline, whatever may be the reset reason, just
2072 * return. callers might be waiting on the reset wait_q, wake
2073 * up them
2074 */
2075 pmcraid_err("IOA is offline no reset is possible\n");
2076 reset_complete = 1;
2077 break;
2078
2079 case IOA_STATE_IN_BRINGDOWN:
2080 /* we enter here, once ioa shutdown command is processed by IOA
2081 * Alert IOA for a possible reset. If reset alert fails, IOA
2082 * goes through hard-reset
2083 */
2084 pmcraid_disable_interrupts(pinstance, ~0);
2085 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2086 pmcraid_reset_alert(cmd);
2087 break;
2088
2089 case IOA_STATE_UNKNOWN:
2090 /* We may be called during probe or resume. Some pre-processing
2091 * is required for prior to reset
2092 */
2093 scsi_block_requests(pinstance->host);
2094
2095 /* If asked to reset while IOA was processing responses or
2096 * there are any error responses then IOA may require
2097 * hard-reset.
2098 */
2099 if (pinstance->ioa_hard_reset == 0) {
2100 if (ioread32(pinstance->ioa_status) &
2101 INTRS_TRANSITION_TO_OPERATIONAL) {
2102 pmcraid_info("sticky bit set, bring-up\n");
2103 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2104 pmcraid_reinit_cmdblk(cmd);
2105 pmcraid_identify_hrrq(cmd);
2106 } else {
2107 pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
2108 pmcraid_soft_reset(cmd);
2109 }
2110 } else {
2111 /* Alert IOA of a possible reset and wait for critical
2112 * operation in progress bit to reset
2113 */
2114 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2115 pmcraid_reset_alert(cmd);
2116 }
2117 break;
2118
2119 case IOA_STATE_IN_RESET_ALERT:
2120 /* If critical operation in progress bit is reset or wait gets
2121 * timed out, reset proceeds with starting BIST on the IOA.
2122 * pmcraid_ioa_hard_reset keeps a count of reset attempts. If
2123 * they are 3 or more, reset engine marks IOA dead and returns
2124 */
2125 pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
2126 pmcraid_start_bist(cmd);
2127 break;
2128
2129 case IOA_STATE_IN_HARD_RESET:
2130 pinstance->ioa_reset_attempts++;
2131
2132 /* retry reset if we haven't reached maximum allowed limit */
2133 if (pinstance->ioa_reset_attempts > PMCRAID_RESET_ATTEMPTS) {
2134 pinstance->ioa_reset_attempts = 0;
2135 pmcraid_err("IOA didn't respond marking it as dead\n");
2136 pinstance->ioa_state = IOA_STATE_DEAD;
2137
2138 if (pinstance->ioa_bringdown)
2139 pmcraid_notify_ioastate(pinstance,
2140 PMC_DEVICE_EVENT_SHUTDOWN_FAILED);
2141 else
2142 pmcraid_notify_ioastate(pinstance,
2143 PMC_DEVICE_EVENT_RESET_FAILED);
2144 reset_complete = 1;
2145 break;
2146 }
2147
2148 /* Once either bist or pci reset is done, restore PCI config
2149 * space. If this fails, proceed with hard reset again
2150 */
2151 pci_restore_state(pinstance->pdev);
2152
2153 /* fail all pending commands */
2154 pmcraid_fail_outstanding_cmds(pinstance);
2155
2156 /* check if unit check is active, if so extract dump */
2157 if (pinstance->ioa_unit_check) {
2158 pmcraid_info("unit check is active\n");
2159 pinstance->ioa_unit_check = 0;
2160 pmcraid_get_dump(pinstance);
2161 pinstance->ioa_reset_attempts--;
2162 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2163 pmcraid_reset_alert(cmd);
2164 break;
2165 }
2166
2167 /* if the reset reason is to bring-down the ioa, we might be
2168 * done with the reset restore pci_config_space and complete
2169 * the reset
2170 */
2171 if (pinstance->ioa_bringdown) {
2172 pmcraid_info("bringing down the adapter\n");
2173 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2174 pinstance->ioa_bringdown = 0;
2175 pinstance->ioa_state = IOA_STATE_UNKNOWN;
2176 pmcraid_notify_ioastate(pinstance,
2177 PMC_DEVICE_EVENT_SHUTDOWN_SUCCESS);
2178 reset_complete = 1;
2179 } else {
2180 /* bring-up IOA, so proceed with soft reset
2181 * Reinitialize hrrq_buffers and their indices also
2182 * enable interrupts after a pci_restore_state
2183 */
2184 if (pmcraid_reset_enable_ioa(pinstance)) {
2185 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2186 pmcraid_info("bringing up the adapter\n");
2187 pmcraid_reinit_cmdblk(cmd);
2188 pmcraid_identify_hrrq(cmd);
2189 } else {
2190 pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
2191 pmcraid_soft_reset(cmd);
2192 }
2193 }
2194 break;
2195
2196 case IOA_STATE_IN_SOFT_RESET:
2197 /* TRANSITION TO OPERATIONAL is on so start initialization
2198 * sequence
2199 */
2200 pmcraid_info("In softreset proceeding with bring-up\n");
2201 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2202
2203 /* Initialization commands start with HRRQ identification. From
2204 * now on tasklet completes most of the commands as IOA is up
2205 * and intrs are enabled
2206 */
2207 pmcraid_identify_hrrq(cmd);
2208 break;
2209
2210 case IOA_STATE_IN_BRINGUP:
2211 /* we are done with bringing up of IOA, change the ioa_state to
2212 * operational and wake up any waiters
2213 */
2214 pinstance->ioa_state = IOA_STATE_OPERATIONAL;
2215 reset_complete = 1;
2216 break;
2217
2218 case IOA_STATE_OPERATIONAL:
2219 default:
2220 /* When IOA is operational and a reset is requested, check for
2221 * the reset reason. If reset is to bring down IOA, unregister
2222 * HCAMs and initiate shutdown; if adapter reset is forced then
2223 * restart reset sequence again
2224 */
2225 if (pinstance->ioa_shutdown_type == SHUTDOWN_NONE &&
2226 pinstance->force_ioa_reset == 0) {
2227 pmcraid_notify_ioastate(pinstance,
2228 PMC_DEVICE_EVENT_RESET_SUCCESS);
2229 reset_complete = 1;
2230 } else {
2231 if (pinstance->ioa_shutdown_type != SHUTDOWN_NONE)
2232 pinstance->ioa_state = IOA_STATE_IN_BRINGDOWN;
2233 pmcraid_reinit_cmdblk(cmd);
2234 pmcraid_unregister_hcams(cmd);
2235 }
2236 break;
2237 }
2238
2239 /* reset will be completed if ioa_state is either DEAD or UNKNOWN or
2240 * OPERATIONAL. Reset all control variables used during reset, wake up
2241 * any waiting threads and let the SCSI mid-layer send commands. Note
2242 * that host_lock must be held before invoking scsi_report_bus_reset.
2243 */
2244 if (reset_complete) {
2245 pinstance->ioa_reset_in_progress = 0;
2246 pinstance->ioa_reset_attempts = 0;
2247 pinstance->reset_cmd = NULL;
2248 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2249 pinstance->ioa_bringdown = 0;
2250 pmcraid_return_cmd(cmd);
2251
2252 /* If target state is to bring up the adapter, proceed with
2253 * hcam registration and resource exposure to mid-layer.
2254 */
2255 if (pinstance->ioa_state == IOA_STATE_OPERATIONAL)
2256 pmcraid_register_hcams(pinstance);
2257
2258 wake_up_all(&pinstance->reset_wait_q);
2259 }
2260
2261 return;
2262}
2263
2264/**
2265 * pmcraid_initiate_reset - initiates reset sequence. This is called from
2266 * ISR/tasklet during error interrupts including IOA unit check. If reset
2267 * is already in progress, it just returns, otherwise initiates IOA reset
2268 * to bring IOA up to operational state.
2269 *
2270 * @pinstance: pointer to adapter instance structure
2271 *
2272 * Return value
2273 * none
2274 */
2275static void pmcraid_initiate_reset(struct pmcraid_instance *pinstance)
2276{
2277 struct pmcraid_cmd *cmd;
2278
2279 /* If the reset is already in progress, just return, otherwise start
2280 * reset sequence and return
2281 */
2282 if (!pinstance->ioa_reset_in_progress) {
2283 scsi_block_requests(pinstance->host);
2284 cmd = pmcraid_get_free_cmd(pinstance);
2285
2286 if (cmd == NULL) {
2287 pmcraid_err("no cmnd blocks for initiate_reset\n");
2288 return;
2289 }
2290
2291 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2292 pinstance->reset_cmd = cmd;
2293 pinstance->force_ioa_reset = 1;
2294 pmcraid_notify_ioastate(pinstance,
2295 PMC_DEVICE_EVENT_RESET_START);
2296 pmcraid_ioa_reset(cmd);
2297 }
2298}
2299
2300/**
2301 * pmcraid_reset_reload - utility routine for doing IOA reset either to bringup
2302 * or bringdown IOA
2303 * @pinstance: pointer adapter instance structure
2304 * @shutdown_type: shutdown type to be used NONE, NORMAL or ABRREV
2305 * @target_state: expected target state after reset
2306 *
2307 * Note: This command initiates reset and waits for its completion. Hence this
2308 * should not be called from isr/timer/tasklet functions (timeout handlers,
2309 * error response handlers and interrupt handlers).
2310 *
2311 * Return Value
2312 * 1 in case ioa_state is not target_state, 0 otherwise.
2313 */
2314static int pmcraid_reset_reload(
2315 struct pmcraid_instance *pinstance,
2316 u8 shutdown_type,
2317 u8 target_state
2318)
2319{
2320 struct pmcraid_cmd *reset_cmd = NULL;
2321 unsigned long lock_flags;
2322 int reset = 1;
2323
2324 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2325
2326 if (pinstance->ioa_reset_in_progress) {
2327 pmcraid_info("reset_reload: reset is already in progress\n");
2328
2329 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2330
2331 wait_event(pinstance->reset_wait_q,
2332 !pinstance->ioa_reset_in_progress);
2333
2334 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2335
2336 if (pinstance->ioa_state == IOA_STATE_DEAD) {
2337 pmcraid_info("reset_reload: IOA is dead\n");
2338 goto out_unlock;
2339 }
2340
2341 if (pinstance->ioa_state == target_state) {
2342 reset = 0;
2343 goto out_unlock;
2344 }
2345 }
2346
2347 pmcraid_info("reset_reload: proceeding with reset\n");
2348 scsi_block_requests(pinstance->host);
2349 reset_cmd = pmcraid_get_free_cmd(pinstance);
2350 if (reset_cmd == NULL) {
2351 pmcraid_err("no free cmnd for reset_reload\n");
2352 goto out_unlock;
2353 }
2354
2355 if (shutdown_type == SHUTDOWN_NORMAL)
2356 pinstance->ioa_bringdown = 1;
2357
2358 pinstance->ioa_shutdown_type = shutdown_type;
2359 pinstance->reset_cmd = reset_cmd;
2360 pinstance->force_ioa_reset = reset;
2361 pmcraid_info("reset_reload: initiating reset\n");
2362 pmcraid_ioa_reset(reset_cmd);
2363 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2364 pmcraid_info("reset_reload: waiting for reset to complete\n");
2365 wait_event(pinstance->reset_wait_q,
2366 !pinstance->ioa_reset_in_progress);
2367
2368 pmcraid_info("reset_reload: reset is complete !!\n");
2369 scsi_unblock_requests(pinstance->host);
2370 return pinstance->ioa_state != target_state;
2371
2372out_unlock:
2373 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2374 return reset;
2375}
2376
2377/**
2378 * pmcraid_reset_bringdown - wrapper over pmcraid_reset_reload to bringdown IOA
2379 *
2380 * @pinstance: pointer to adapter instance structure
2381 *
2382 * Return Value
2383 * whatever is returned from pmcraid_reset_reload
2384 */
2385static int pmcraid_reset_bringdown(struct pmcraid_instance *pinstance)
2386{
2387 return pmcraid_reset_reload(pinstance,
2388 SHUTDOWN_NORMAL,
2389 IOA_STATE_UNKNOWN);
2390}
2391
2392/**
2393 * pmcraid_reset_bringup - wrapper over pmcraid_reset_reload to bring up IOA
2394 *
2395 * @pinstance: pointer to adapter instance structure
2396 *
2397 * Return Value
2398 * whatever is returned from pmcraid_reset_reload
2399 */
2400static int pmcraid_reset_bringup(struct pmcraid_instance *pinstance)
2401{
2402 pmcraid_notify_ioastate(pinstance, PMC_DEVICE_EVENT_RESET_START);
2403
2404 return pmcraid_reset_reload(pinstance,
2405 SHUTDOWN_NONE,
2406 IOA_STATE_OPERATIONAL);
2407}
2408
2409/**
2410 * pmcraid_request_sense - Send request sense to a device
2411 * @cmd: pmcraid command struct
2412 *
2413 * This function sends a request sense to a device as a result of a check
2414 * condition. This method re-uses the same command block that failed earlier.
2415 */
2416static void pmcraid_request_sense(struct pmcraid_cmd *cmd)
2417{
2418 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
2419 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
2420 struct device *dev = &cmd->drv_inst->pdev->dev;
2421
2422 cmd->sense_buffer = cmd->scsi_cmd->sense_buffer;
2423 cmd->sense_buffer_dma = dma_map_single(dev, cmd->sense_buffer,
2424 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
2425 if (dma_mapping_error(dev, cmd->sense_buffer_dma)) {
2426 pmcraid_err
2427 ("couldn't allocate sense buffer for request sense\n");
2428 pmcraid_erp_done(cmd);
2429 return;
2430 }
2431
2432 /* re-use the command block */
2433 memset(&cmd->ioa_cb->ioasa, 0, sizeof(struct pmcraid_ioasa));
2434 memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
2435 ioarcb->request_flags0 = (SYNC_COMPLETE |
2436 NO_LINK_DESCS |
2437 INHIBIT_UL_CHECK);
2438 ioarcb->request_type = REQ_TYPE_SCSI;
2439 ioarcb->cdb[0] = REQUEST_SENSE;
2440 ioarcb->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2441
2442 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
2443 offsetof(struct pmcraid_ioarcb,
2444 add_data.u.ioadl[0]));
2445 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
2446
2447 ioarcb->data_transfer_length = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
2448
2449 ioadl->address = cpu_to_le64(cmd->sense_buffer_dma);
2450 ioadl->data_len = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
2451 ioadl->flags = IOADL_FLAGS_LAST_DESC;
2452
2453 /* request sense might be called as part of error response processing
2454 * which runs in tasklets context. It is possible that mid-layer might
2455 * schedule queuecommand during this time, hence, writting to IOARRIN
2456 * must be protect by host_lock
2457 */
2458 pmcraid_send_cmd(cmd, pmcraid_erp_done,
2459 PMCRAID_REQUEST_SENSE_TIMEOUT,
2460 pmcraid_timeout_handler);
2461}
2462
2463/**
2464 * pmcraid_cancel_all - cancel all outstanding IOARCBs as part of error recovery
2465 * @cmd: command that failed
2466 * @need_sense: true if request_sense is required after cancel all
2467 *
2468 * This function sends a cancel all to a device to clear the queue.
2469 */
2470static void pmcraid_cancel_all(struct pmcraid_cmd *cmd, bool need_sense)
2471{
2472 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2473 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
2474 struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
2475
2476 memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
2477 ioarcb->request_flags0 = SYNC_OVERRIDE;
2478 ioarcb->request_type = REQ_TYPE_IOACMD;
2479 ioarcb->cdb[0] = PMCRAID_CANCEL_ALL_REQUESTS;
2480
2481 if (RES_IS_GSCSI(res->cfg_entry))
2482 ioarcb->cdb[1] = PMCRAID_SYNC_COMPLETE_AFTER_CANCEL;
2483
2484 ioarcb->ioadl_bus_addr = 0;
2485 ioarcb->ioadl_length = 0;
2486 ioarcb->data_transfer_length = 0;
2487 ioarcb->ioarcb_bus_addr &= cpu_to_le64((~0x1FULL));
2488
2489 /* writing to IOARRIN must be protected by host_lock, as mid-layer
2490 * schedule queuecommand while we are doing this
2491 */
2492 pmcraid_send_cmd(cmd, need_sense ?
2493 pmcraid_erp_done : pmcraid_request_sense,
2494 PMCRAID_REQUEST_SENSE_TIMEOUT,
2495 pmcraid_timeout_handler);
2496}
2497
2498/**
2499 * pmcraid_frame_auto_sense: frame fixed format sense information
2500 *
2501 * @cmd: pointer to failing command block
2502 *
2503 * Return value
2504 * none
2505 */
2506static void pmcraid_frame_auto_sense(struct pmcraid_cmd *cmd)
2507{
2508 u8 *sense_buf = cmd->scsi_cmd->sense_buffer;
2509 struct pmcraid_resource_entry *res = cmd->scsi_cmd->device->hostdata;
2510 struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
2511 u32 ioasc = le32_to_cpu(ioasa->ioasc);
2512 u32 failing_lba = 0;
2513
2514 memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
2515 cmd->scsi_cmd->result = SAM_STAT_CHECK_CONDITION;
2516
2517 if (RES_IS_VSET(res->cfg_entry) &&
2518 ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC &&
2519 ioasa->u.vset.failing_lba_hi != 0) {
2520
2521 sense_buf[0] = 0x72;
2522 sense_buf[1] = PMCRAID_IOASC_SENSE_KEY(ioasc);
2523 sense_buf[2] = PMCRAID_IOASC_SENSE_CODE(ioasc);
2524 sense_buf[3] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
2525
2526 sense_buf[7] = 12;
2527 sense_buf[8] = 0;
2528 sense_buf[9] = 0x0A;
2529 sense_buf[10] = 0x80;
2530
2531 failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_hi);
2532
2533 sense_buf[12] = (failing_lba & 0xff000000) >> 24;
2534 sense_buf[13] = (failing_lba & 0x00ff0000) >> 16;
2535 sense_buf[14] = (failing_lba & 0x0000ff00) >> 8;
2536 sense_buf[15] = failing_lba & 0x000000ff;
2537
2538 failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_lo);
2539
2540 sense_buf[16] = (failing_lba & 0xff000000) >> 24;
2541 sense_buf[17] = (failing_lba & 0x00ff0000) >> 16;
2542 sense_buf[18] = (failing_lba & 0x0000ff00) >> 8;
2543 sense_buf[19] = failing_lba & 0x000000ff;
2544 } else {
2545 sense_buf[0] = 0x70;
2546 sense_buf[2] = PMCRAID_IOASC_SENSE_KEY(ioasc);
2547 sense_buf[12] = PMCRAID_IOASC_SENSE_CODE(ioasc);
2548 sense_buf[13] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
2549
2550 if (ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC) {
2551 if (RES_IS_VSET(res->cfg_entry))
2552 failing_lba =
2553 le32_to_cpu(ioasa->u.
2554 vset.failing_lba_lo);
2555 sense_buf[0] |= 0x80;
2556 sense_buf[3] = (failing_lba >> 24) & 0xff;
2557 sense_buf[4] = (failing_lba >> 16) & 0xff;
2558 sense_buf[5] = (failing_lba >> 8) & 0xff;
2559 sense_buf[6] = failing_lba & 0xff;
2560 }
2561
2562 sense_buf[7] = 6; /* additional length */
2563 }
2564}
2565
2566/**
2567 * pmcraid_error_handler - Error response handlers for a SCSI op
2568 * @cmd: pointer to pmcraid_cmd that has failed
2569 *
2570 * This function determines whether or not to initiate ERP on the affected
2571 * device. This is called from a tasklet, which doesn't hold any locks.
2572 *
2573 * Return value:
2574 * 0 it caller can complete the request, otherwise 1 where in error
2575 * handler itself completes the request and returns the command block
2576 * back to free-pool
2577 */
2578static int pmcraid_error_handler(struct pmcraid_cmd *cmd)
2579{
2580 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2581 struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
2582 struct pmcraid_instance *pinstance = cmd->drv_inst;
2583 struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
2584 u32 ioasc = le32_to_cpu(ioasa->ioasc);
2585 u32 masked_ioasc = ioasc & PMCRAID_IOASC_SENSE_MASK;
2586 bool sense_copied = false;
2587
2588 if (!res) {
2589 pmcraid_info("resource pointer is NULL\n");
2590 return 0;
2591 }
2592
2593 /* If this was a SCSI read/write command keep count of errors */
2594 if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_READ_CMD)
2595 atomic_inc(&res->read_failures);
2596 else if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_WRITE_CMD)
2597 atomic_inc(&res->write_failures);
2598
2599 if (!RES_IS_GSCSI(res->cfg_entry) &&
2600 masked_ioasc != PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR) {
2601 pmcraid_frame_auto_sense(cmd);
2602 }
2603
2604 /* Log IOASC/IOASA information based on user settings */
2605 pmcraid_ioasc_logger(ioasc, cmd);
2606
2607 switch (masked_ioasc) {
2608
2609 case PMCRAID_IOASC_AC_TERMINATED_BY_HOST:
2610 scsi_cmd->result |= (DID_ABORT << 16);
2611 break;
2612
2613 case PMCRAID_IOASC_IR_INVALID_RESOURCE_HANDLE:
2614 case PMCRAID_IOASC_HW_CANNOT_COMMUNICATE:
2615 scsi_cmd->result |= (DID_NO_CONNECT << 16);
2616 break;
2617
2618 case PMCRAID_IOASC_NR_SYNC_REQUIRED:
2619 res->sync_reqd = 1;
2620 scsi_cmd->result |= (DID_IMM_RETRY << 16);
2621 break;
2622
2623 case PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC:
2624 scsi_cmd->result |= (DID_PASSTHROUGH << 16);
2625 break;
2626
2627 case PMCRAID_IOASC_UA_BUS_WAS_RESET:
2628 case PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER:
2629 if (!res->reset_progress)
2630 scsi_report_bus_reset(pinstance->host,
2631 scsi_cmd->device->channel);
2632 scsi_cmd->result |= (DID_ERROR << 16);
2633 break;
2634
2635 case PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR:
2636 scsi_cmd->result |= PMCRAID_IOASC_SENSE_STATUS(ioasc);
2637 res->sync_reqd = 1;
2638
2639 /* if check_condition is not active return with error otherwise
2640 * get/frame the sense buffer
2641 */
2642 if (PMCRAID_IOASC_SENSE_STATUS(ioasc) !=
2643 SAM_STAT_CHECK_CONDITION &&
2644 PMCRAID_IOASC_SENSE_STATUS(ioasc) != SAM_STAT_ACA_ACTIVE)
2645 return 0;
2646
2647 /* If we have auto sense data as part of IOASA pass it to
2648 * mid-layer
2649 */
2650 if (ioasa->auto_sense_length != 0) {
2651 short sense_len = le16_to_cpu(ioasa->auto_sense_length);
2652 int data_size = min_t(u16, sense_len,
2653 SCSI_SENSE_BUFFERSIZE);
2654
2655 memcpy(scsi_cmd->sense_buffer,
2656 ioasa->sense_data,
2657 data_size);
2658 sense_copied = true;
2659 }
2660
2661 if (RES_IS_GSCSI(res->cfg_entry))
2662 pmcraid_cancel_all(cmd, sense_copied);
2663 else if (sense_copied)
2664 pmcraid_erp_done(cmd);
2665 else
2666 pmcraid_request_sense(cmd);
2667
2668 return 1;
2669
2670 case PMCRAID_IOASC_NR_INIT_CMD_REQUIRED:
2671 break;
2672
2673 default:
2674 if (PMCRAID_IOASC_SENSE_KEY(ioasc) > RECOVERED_ERROR)
2675 scsi_cmd->result |= (DID_ERROR << 16);
2676 break;
2677 }
2678 return 0;
2679}
2680
2681/**
2682 * pmcraid_reset_device - device reset handler functions
2683 *
2684 * @scsi_dev: scsi device struct
2685 * @timeout: command timeout
2686 * @modifier: reset modifier indicating the reset sequence to be performed
2687 *
2688 * This function issues a device reset to the affected device.
2689 * A LUN reset will be sent to the device first. If that does
2690 * not work, a target reset will be sent.
2691 *
2692 * Return value:
2693 * SUCCESS / FAILED
2694 */
2695static int pmcraid_reset_device(
2696 struct scsi_device *scsi_dev,
2697 unsigned long timeout,
2698 u8 modifier)
2699{
2700 struct pmcraid_cmd *cmd;
2701 struct pmcraid_instance *pinstance;
2702 struct pmcraid_resource_entry *res;
2703 struct pmcraid_ioarcb *ioarcb;
2704 unsigned long lock_flags;
2705 u32 ioasc;
2706
2707 pinstance =
2708 (struct pmcraid_instance *)scsi_dev->host->hostdata;
2709 res = scsi_dev->hostdata;
2710
2711 if (!res) {
2712 sdev_printk(KERN_ERR, scsi_dev,
2713 "reset_device: NULL resource pointer\n");
2714 return FAILED;
2715 }
2716
2717 /* If adapter is currently going through reset/reload, return failed.
2718 * This will force the mid-layer to call _eh_bus/host reset, which
2719 * will then go to sleep and wait for the reset to complete
2720 */
2721 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2722 if (pinstance->ioa_reset_in_progress ||
2723 pinstance->ioa_state == IOA_STATE_DEAD) {
2724 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2725 return FAILED;
2726 }
2727
2728 res->reset_progress = 1;
2729 pmcraid_info("Resetting %s resource with addr %x\n",
2730 ((modifier & RESET_DEVICE_LUN) ? "LUN" :
2731 ((modifier & RESET_DEVICE_TARGET) ? "TARGET" : "BUS")),
2732 le32_to_cpu(res->cfg_entry.resource_address));
2733
2734 /* get a free cmd block */
2735 cmd = pmcraid_get_free_cmd(pinstance);
2736
2737 if (cmd == NULL) {
2738 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2739 pmcraid_err("%s: no cmd blocks are available\n", __func__);
2740 return FAILED;
2741 }
2742
2743 ioarcb = &cmd->ioa_cb->ioarcb;
2744 ioarcb->resource_handle = res->cfg_entry.resource_handle;
2745 ioarcb->request_type = REQ_TYPE_IOACMD;
2746 ioarcb->cdb[0] = PMCRAID_RESET_DEVICE;
2747
2748 /* Initialize reset modifier bits */
2749 if (modifier)
2750 modifier = ENABLE_RESET_MODIFIER | modifier;
2751
2752 ioarcb->cdb[1] = modifier;
2753
2754 init_completion(&cmd->wait_for_completion);
2755 cmd->completion_req = 1;
2756
2757 pmcraid_info("cmd(CDB[0] = %x) for %x with index = %d\n",
2758 cmd->ioa_cb->ioarcb.cdb[0],
2759 le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle),
2760 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2);
2761
2762 pmcraid_send_cmd(cmd,
2763 pmcraid_internal_done,
2764 timeout,
2765 pmcraid_timeout_handler);
2766
2767 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2768
2769 /* RESET_DEVICE command completes after all pending IOARCBs are
2770 * completed. Once this command is completed, pmcraind_internal_done
2771 * will wake up the 'completion' queue.
2772 */
2773 wait_for_completion(&cmd->wait_for_completion);
2774
2775 /* complete the command here itself and return the command block
2776 * to free list
2777 */
2778 pmcraid_return_cmd(cmd);
2779 res->reset_progress = 0;
2780 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
2781
2782 /* set the return value based on the returned ioasc */
2783 return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
2784}
2785
2786/**
2787 * _pmcraid_io_done - helper for pmcraid_io_done function
2788 *
2789 * @cmd: pointer to pmcraid command struct
2790 * @reslen: residual data length to be set in the ioasa
2791 * @ioasc: ioasc either returned by IOA or set by driver itself.
2792 *
2793 * This function is invoked by pmcraid_io_done to complete mid-layer
2794 * scsi ops.
2795 *
2796 * Return value:
2797 * 0 if caller is required to return it to free_pool. Returns 1 if
2798 * caller need not worry about freeing command block as error handler
2799 * will take care of that.
2800 */
2801
2802static int _pmcraid_io_done(struct pmcraid_cmd *cmd, int reslen, int ioasc)
2803{
2804 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2805 int rc = 0;
2806
2807 scsi_set_resid(scsi_cmd, reslen);
2808
2809 pmcraid_info("response(%d) CDB[0] = %x ioasc:result: %x:%x\n",
2810 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
2811 cmd->ioa_cb->ioarcb.cdb[0],
2812 ioasc, scsi_cmd->result);
2813
2814 if (PMCRAID_IOASC_SENSE_KEY(ioasc) != 0)
2815 rc = pmcraid_error_handler(cmd);
2816
2817 if (rc == 0) {
2818 scsi_dma_unmap(scsi_cmd);
2819 scsi_done(scsi_cmd);
2820 }
2821
2822 return rc;
2823}
2824
2825/**
2826 * pmcraid_io_done - SCSI completion function
2827 *
2828 * @cmd: pointer to pmcraid command struct
2829 *
2830 * This function is invoked by tasklet/mid-layer error handler to completing
2831 * the SCSI ops sent from mid-layer.
2832 *
2833 * Return value
2834 * none
2835 */
2836
2837static void pmcraid_io_done(struct pmcraid_cmd *cmd)
2838{
2839 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
2840 u32 reslen = le32_to_cpu(cmd->ioa_cb->ioasa.residual_data_length);
2841
2842 if (_pmcraid_io_done(cmd, reslen, ioasc) == 0)
2843 pmcraid_return_cmd(cmd);
2844}
2845
2846/**
2847 * pmcraid_abort_cmd - Aborts a single IOARCB already submitted to IOA
2848 *
2849 * @cmd: command block of the command to be aborted
2850 *
2851 * Return Value:
2852 * returns pointer to command structure used as cancelling cmd
2853 */
2854static struct pmcraid_cmd *pmcraid_abort_cmd(struct pmcraid_cmd *cmd)
2855{
2856 struct pmcraid_cmd *cancel_cmd;
2857 struct pmcraid_instance *pinstance;
2858
2859 pinstance = (struct pmcraid_instance *)cmd->drv_inst;
2860
2861 cancel_cmd = pmcraid_get_free_cmd(pinstance);
2862
2863 if (cancel_cmd == NULL) {
2864 pmcraid_err("%s: no cmd blocks are available\n", __func__);
2865 return NULL;
2866 }
2867
2868 pmcraid_prepare_cancel_cmd(cancel_cmd, cmd);
2869
2870 pmcraid_info("aborting command CDB[0]= %x with index = %d\n",
2871 cmd->ioa_cb->ioarcb.cdb[0],
2872 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2);
2873
2874 init_completion(&cancel_cmd->wait_for_completion);
2875 cancel_cmd->completion_req = 1;
2876
2877 pmcraid_info("command (%d) CDB[0] = %x for %x\n",
2878 le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.response_handle) >> 2,
2879 cancel_cmd->ioa_cb->ioarcb.cdb[0],
2880 le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.resource_handle));
2881
2882 pmcraid_send_cmd(cancel_cmd,
2883 pmcraid_internal_done,
2884 PMCRAID_INTERNAL_TIMEOUT,
2885 pmcraid_timeout_handler);
2886 return cancel_cmd;
2887}
2888
2889/**
2890 * pmcraid_abort_complete - Waits for ABORT TASK completion
2891 *
2892 * @cancel_cmd: command block use as cancelling command
2893 *
2894 * Return Value:
2895 * returns SUCCESS if ABORT TASK has good completion
2896 * otherwise FAILED
2897 */
2898static int pmcraid_abort_complete(struct pmcraid_cmd *cancel_cmd)
2899{
2900 struct pmcraid_resource_entry *res;
2901 u32 ioasc;
2902
2903 wait_for_completion(&cancel_cmd->wait_for_completion);
2904 res = cancel_cmd->res;
2905 cancel_cmd->res = NULL;
2906 ioasc = le32_to_cpu(cancel_cmd->ioa_cb->ioasa.ioasc);
2907
2908 /* If the abort task is not timed out we will get a Good completion
2909 * as sense_key, otherwise we may get one the following responses
2910 * due to subsequent bus reset or device reset. In case IOASC is
2911 * NR_SYNC_REQUIRED, set sync_reqd flag for the corresponding resource
2912 */
2913 if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
2914 ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED) {
2915 if (ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED)
2916 res->sync_reqd = 1;
2917 ioasc = 0;
2918 }
2919
2920 /* complete the command here itself */
2921 pmcraid_return_cmd(cancel_cmd);
2922 return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
2923}
2924
2925/**
2926 * pmcraid_eh_abort_handler - entry point for aborting a single task on errors
2927 *
2928 * @scsi_cmd: scsi command struct given by mid-layer. When this is called
2929 * mid-layer ensures that no other commands are queued. This
2930 * never gets called under interrupt, but a separate eh thread.
2931 *
2932 * Return value:
2933 * SUCCESS / FAILED
2934 */
2935static int pmcraid_eh_abort_handler(struct scsi_cmnd *scsi_cmd)
2936{
2937 struct pmcraid_instance *pinstance;
2938 struct pmcraid_cmd *cmd;
2939 struct pmcraid_resource_entry *res;
2940 unsigned long host_lock_flags;
2941 unsigned long pending_lock_flags;
2942 struct pmcraid_cmd *cancel_cmd = NULL;
2943 int cmd_found = 0;
2944 int rc = FAILED;
2945
2946 pinstance =
2947 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
2948
2949 scmd_printk(KERN_INFO, scsi_cmd,
2950 "I/O command timed out, aborting it.\n");
2951
2952 res = scsi_cmd->device->hostdata;
2953
2954 if (res == NULL)
2955 return rc;
2956
2957 /* If we are currently going through reset/reload, return failed.
2958 * This will force the mid-layer to eventually call
2959 * pmcraid_eh_host_reset which will then go to sleep and wait for the
2960 * reset to complete
2961 */
2962 spin_lock_irqsave(pinstance->host->host_lock, host_lock_flags);
2963
2964 if (pinstance->ioa_reset_in_progress ||
2965 pinstance->ioa_state == IOA_STATE_DEAD) {
2966 spin_unlock_irqrestore(pinstance->host->host_lock,
2967 host_lock_flags);
2968 return rc;
2969 }
2970
2971 /* loop over pending cmd list to find cmd corresponding to this
2972 * scsi_cmd. Note that this command might not have been completed
2973 * already. locking: all pending commands are protected with
2974 * pending_pool_lock.
2975 */
2976 spin_lock_irqsave(&pinstance->pending_pool_lock, pending_lock_flags);
2977 list_for_each_entry(cmd, &pinstance->pending_cmd_pool, free_list) {
2978
2979 if (cmd->scsi_cmd == scsi_cmd) {
2980 cmd_found = 1;
2981 break;
2982 }
2983 }
2984
2985 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
2986 pending_lock_flags);
2987
2988 /* If the command to be aborted was given to IOA and still pending with
2989 * it, send ABORT_TASK to abort this and wait for its completion
2990 */
2991 if (cmd_found)
2992 cancel_cmd = pmcraid_abort_cmd(cmd);
2993
2994 spin_unlock_irqrestore(pinstance->host->host_lock,
2995 host_lock_flags);
2996
2997 if (cancel_cmd) {
2998 cancel_cmd->res = cmd->scsi_cmd->device->hostdata;
2999 rc = pmcraid_abort_complete(cancel_cmd);
3000 }
3001
3002 return cmd_found ? rc : SUCCESS;
3003}
3004
3005/**
3006 * pmcraid_eh_device_reset_handler - bus/target/device reset handler callbacks
3007 *
3008 * @scmd: pointer to scsi_cmd that was sent to the resource to be reset.
3009 *
3010 * All these routines invokve pmcraid_reset_device with appropriate parameters.
3011 * Since these are called from mid-layer EH thread, no other IO will be queued
3012 * to the resource being reset. However, control path (IOCTL) may be active so
3013 * it is necessary to synchronize IOARRIN writes which pmcraid_reset_device
3014 * takes care by locking/unlocking host_lock.
3015 *
3016 * Return value
3017 * SUCCESS or FAILED
3018 */
3019static int pmcraid_eh_device_reset_handler(struct scsi_cmnd *scmd)
3020{
3021 scmd_printk(KERN_INFO, scmd,
3022 "resetting device due to an I/O command timeout.\n");
3023 return pmcraid_reset_device(scmd->device,
3024 PMCRAID_INTERNAL_TIMEOUT,
3025 RESET_DEVICE_LUN);
3026}
3027
3028static int pmcraid_eh_bus_reset_handler(struct scsi_cmnd *scmd)
3029{
3030 struct Scsi_Host *host = scmd->device->host;
3031 struct pmcraid_instance *pinstance =
3032 (struct pmcraid_instance *)host->hostdata;
3033 struct pmcraid_resource_entry *res = NULL;
3034 struct pmcraid_resource_entry *temp;
3035 struct scsi_device *sdev = NULL;
3036 unsigned long lock_flags;
3037
3038 /*
3039 * The reset device code insists on us passing down
3040 * a device, so grab the first device on the bus.
3041 */
3042 spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
3043 list_for_each_entry(temp, &pinstance->used_res_q, queue) {
3044 if (scmd->device->channel == PMCRAID_VSET_BUS_ID &&
3045 RES_IS_VSET(temp->cfg_entry)) {
3046 res = temp;
3047 break;
3048 } else if (scmd->device->channel == PMCRAID_PHYS_BUS_ID &&
3049 RES_IS_GSCSI(temp->cfg_entry)) {
3050 res = temp;
3051 break;
3052 }
3053 }
3054 if (res)
3055 sdev = res->scsi_dev;
3056 spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
3057 if (!sdev)
3058 return FAILED;
3059
3060 sdev_printk(KERN_INFO, sdev,
3061 "Doing bus reset due to an I/O command timeout.\n");
3062 return pmcraid_reset_device(sdev,
3063 PMCRAID_RESET_BUS_TIMEOUT,
3064 RESET_DEVICE_BUS);
3065}
3066
3067static int pmcraid_eh_target_reset_handler(struct scsi_cmnd *scmd)
3068{
3069 struct Scsi_Host *shost = scmd->device->host;
3070 struct scsi_device *scsi_dev = NULL, *tmp;
3071 int ret;
3072
3073 shost_for_each_device(tmp, shost) {
3074 if ((tmp->channel == scmd->device->channel) &&
3075 (tmp->id == scmd->device->id)) {
3076 scsi_dev = tmp;
3077 break;
3078 }
3079 }
3080 if (!scsi_dev)
3081 return FAILED;
3082 sdev_printk(KERN_INFO, scsi_dev,
3083 "Doing target reset due to an I/O command timeout.\n");
3084 ret = pmcraid_reset_device(scsi_dev,
3085 PMCRAID_INTERNAL_TIMEOUT,
3086 RESET_DEVICE_TARGET);
3087 scsi_device_put(scsi_dev);
3088 return ret;
3089}
3090
3091/**
3092 * pmcraid_eh_host_reset_handler - adapter reset handler callback
3093 *
3094 * @scmd: pointer to scsi_cmd that was sent to a resource of adapter
3095 *
3096 * Initiates adapter reset to bring it up to operational state
3097 *
3098 * Return value
3099 * SUCCESS or FAILED
3100 */
3101static int pmcraid_eh_host_reset_handler(struct scsi_cmnd *scmd)
3102{
3103 unsigned long interval = 10000; /* 10 seconds interval */
3104 int waits = jiffies_to_msecs(PMCRAID_RESET_HOST_TIMEOUT) / interval;
3105 struct pmcraid_instance *pinstance =
3106 (struct pmcraid_instance *)(scmd->device->host->hostdata);
3107
3108
3109 /* wait for an additional 150 seconds just in case firmware could come
3110 * up and if it could complete all the pending commands excluding the
3111 * two HCAM (CCN and LDN).
3112 */
3113 while (waits--) {
3114 if (atomic_read(&pinstance->outstanding_cmds) <=
3115 PMCRAID_MAX_HCAM_CMD)
3116 return SUCCESS;
3117 msleep(interval);
3118 }
3119
3120 dev_err(&pinstance->pdev->dev,
3121 "Adapter being reset due to an I/O command timeout.\n");
3122 return pmcraid_reset_bringup(pinstance) == 0 ? SUCCESS : FAILED;
3123}
3124
3125/**
3126 * pmcraid_init_ioadls - initializes IOADL related fields in IOARCB
3127 * @cmd: pmcraid command struct
3128 * @sgcount: count of scatter-gather elements
3129 *
3130 * Return value
3131 * returns pointer pmcraid_ioadl_desc, initialized to point to internal
3132 * or external IOADLs
3133 */
3134static struct pmcraid_ioadl_desc *
3135pmcraid_init_ioadls(struct pmcraid_cmd *cmd, int sgcount)
3136{
3137 struct pmcraid_ioadl_desc *ioadl;
3138 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
3139 int ioadl_count = 0;
3140
3141 if (ioarcb->add_cmd_param_length)
3142 ioadl_count = DIV_ROUND_UP(le16_to_cpu(ioarcb->add_cmd_param_length), 16);
3143 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc) * sgcount);
3144
3145 if ((sgcount + ioadl_count) > (ARRAY_SIZE(ioarcb->add_data.u.ioadl))) {
3146 /* external ioadls start at offset 0x80 from control_block
3147 * structure, re-using 24 out of 27 ioadls part of IOARCB.
3148 * It is necessary to indicate to firmware that driver is
3149 * using ioadls to be treated as external to IOARCB.
3150 */
3151 ioarcb->ioarcb_bus_addr &= cpu_to_le64(~(0x1FULL));
3152 ioarcb->ioadl_bus_addr =
3153 cpu_to_le64((cmd->ioa_cb_bus_addr) +
3154 offsetof(struct pmcraid_ioarcb,
3155 add_data.u.ioadl[3]));
3156 ioadl = &ioarcb->add_data.u.ioadl[3];
3157 } else {
3158 ioarcb->ioadl_bus_addr =
3159 cpu_to_le64((cmd->ioa_cb_bus_addr) +
3160 offsetof(struct pmcraid_ioarcb,
3161 add_data.u.ioadl[ioadl_count]));
3162
3163 ioadl = &ioarcb->add_data.u.ioadl[ioadl_count];
3164 ioarcb->ioarcb_bus_addr |=
3165 cpu_to_le64(DIV_ROUND_CLOSEST(sgcount + ioadl_count, 8));
3166 }
3167
3168 return ioadl;
3169}
3170
3171/**
3172 * pmcraid_build_ioadl - Build a scatter/gather list and map the buffer
3173 * @pinstance: pointer to adapter instance structure
3174 * @cmd: pmcraid command struct
3175 *
3176 * This function is invoked by queuecommand entry point while sending a command
3177 * to firmware. This builds ioadl descriptors and sets up ioarcb fields.
3178 *
3179 * Return value:
3180 * 0 on success or -1 on failure
3181 */
3182static int pmcraid_build_ioadl(
3183 struct pmcraid_instance *pinstance,
3184 struct pmcraid_cmd *cmd
3185)
3186{
3187 int i, nseg;
3188 struct scatterlist *sglist;
3189
3190 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
3191 struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
3192 struct pmcraid_ioadl_desc *ioadl;
3193
3194 u32 length = scsi_bufflen(scsi_cmd);
3195
3196 if (!length)
3197 return 0;
3198
3199 nseg = scsi_dma_map(scsi_cmd);
3200
3201 if (nseg < 0) {
3202 scmd_printk(KERN_ERR, scsi_cmd, "scsi_map_dma failed!\n");
3203 return -1;
3204 } else if (nseg > PMCRAID_MAX_IOADLS) {
3205 scsi_dma_unmap(scsi_cmd);
3206 scmd_printk(KERN_ERR, scsi_cmd,
3207 "sg count is (%d) more than allowed!\n", nseg);
3208 return -1;
3209 }
3210
3211 /* Initialize IOARCB data transfer length fields */
3212 if (scsi_cmd->sc_data_direction == DMA_TO_DEVICE)
3213 ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
3214
3215 ioarcb->request_flags0 |= NO_LINK_DESCS;
3216 ioarcb->data_transfer_length = cpu_to_le32(length);
3217 ioadl = pmcraid_init_ioadls(cmd, nseg);
3218
3219 /* Initialize IOADL descriptor addresses */
3220 scsi_for_each_sg(scsi_cmd, sglist, nseg, i) {
3221 ioadl[i].data_len = cpu_to_le32(sg_dma_len(sglist));
3222 ioadl[i].address = cpu_to_le64(sg_dma_address(sglist));
3223 ioadl[i].flags = 0;
3224 }
3225 /* setup last descriptor */
3226 ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;
3227
3228 return 0;
3229}
3230
3231/**
3232 * pmcraid_queuecommand_lck - Queue a mid-layer request
3233 * @scsi_cmd: scsi command struct
3234 *
3235 * This function queues a request generated by the mid-layer. Midlayer calls
3236 * this routine within host->lock. Some of the functions called by queuecommand
3237 * would use cmd block queue locks (free_pool_lock and pending_pool_lock)
3238 *
3239 * Return value:
3240 * 0 on success
3241 * SCSI_MLQUEUE_DEVICE_BUSY if device is busy
3242 * SCSI_MLQUEUE_HOST_BUSY if host is busy
3243 */
3244static int pmcraid_queuecommand_lck(struct scsi_cmnd *scsi_cmd)
3245{
3246 struct pmcraid_instance *pinstance;
3247 struct pmcraid_resource_entry *res;
3248 struct pmcraid_ioarcb *ioarcb;
3249 struct pmcraid_cmd *cmd;
3250 u32 fw_version;
3251 int rc = 0;
3252
3253 pinstance =
3254 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
3255 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
3256 res = scsi_cmd->device->hostdata;
3257 scsi_cmd->result = (DID_OK << 16);
3258
3259 /* if adapter is marked as dead, set result to DID_NO_CONNECT complete
3260 * the command
3261 */
3262 if (pinstance->ioa_state == IOA_STATE_DEAD) {
3263 pmcraid_info("IOA is dead, but queuecommand is scheduled\n");
3264 scsi_cmd->result = (DID_NO_CONNECT << 16);
3265 scsi_done(scsi_cmd);
3266 return 0;
3267 }
3268
3269 /* If IOA reset is in progress, can't queue the commands */
3270 if (pinstance->ioa_reset_in_progress)
3271 return SCSI_MLQUEUE_HOST_BUSY;
3272
3273 /* Firmware doesn't support SYNCHRONIZE_CACHE command (0x35), complete
3274 * the command here itself with success return
3275 */
3276 if (scsi_cmd->cmnd[0] == SYNCHRONIZE_CACHE) {
3277 pmcraid_info("SYNC_CACHE(0x35), completing in driver itself\n");
3278 scsi_done(scsi_cmd);
3279 return 0;
3280 }
3281
3282 /* initialize the command and IOARCB to be sent to IOA */
3283 cmd = pmcraid_get_free_cmd(pinstance);
3284
3285 if (cmd == NULL) {
3286 pmcraid_err("free command block is not available\n");
3287 return SCSI_MLQUEUE_HOST_BUSY;
3288 }
3289
3290 cmd->scsi_cmd = scsi_cmd;
3291 ioarcb = &(cmd->ioa_cb->ioarcb);
3292 memcpy(ioarcb->cdb, scsi_cmd->cmnd, scsi_cmd->cmd_len);
3293 ioarcb->resource_handle = res->cfg_entry.resource_handle;
3294 ioarcb->request_type = REQ_TYPE_SCSI;
3295
3296 /* set hrrq number where the IOA should respond to. Note that all cmds
3297 * generated internally uses hrrq_id 0, exception to this is the cmd
3298 * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
3299 * hrrq_id assigned here in queuecommand
3300 */
3301 ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
3302 pinstance->num_hrrq;
3303 cmd->cmd_done = pmcraid_io_done;
3304
3305 if (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry)) {
3306 if (scsi_cmd->underflow == 0)
3307 ioarcb->request_flags0 |= INHIBIT_UL_CHECK;
3308
3309 if (res->sync_reqd) {
3310 ioarcb->request_flags0 |= SYNC_COMPLETE;
3311 res->sync_reqd = 0;
3312 }
3313
3314 ioarcb->request_flags0 |= NO_LINK_DESCS;
3315
3316 if (scsi_cmd->flags & SCMD_TAGGED)
3317 ioarcb->request_flags1 |= TASK_TAG_SIMPLE;
3318
3319 if (RES_IS_GSCSI(res->cfg_entry))
3320 ioarcb->request_flags1 |= DELAY_AFTER_RESET;
3321 }
3322
3323 rc = pmcraid_build_ioadl(pinstance, cmd);
3324
3325 pmcraid_info("command (%d) CDB[0] = %x for %x:%x:%x:%x\n",
3326 le32_to_cpu(ioarcb->response_handle) >> 2,
3327 scsi_cmd->cmnd[0], pinstance->host->unique_id,
3328 RES_IS_VSET(res->cfg_entry) ? PMCRAID_VSET_BUS_ID :
3329 PMCRAID_PHYS_BUS_ID,
3330 RES_IS_VSET(res->cfg_entry) ?
3331 (fw_version <= PMCRAID_FW_VERSION_1 ?
3332 res->cfg_entry.unique_flags1 :
3333 le16_to_cpu(res->cfg_entry.array_id) & 0xFF) :
3334 RES_TARGET(res->cfg_entry.resource_address),
3335 RES_LUN(res->cfg_entry.resource_address));
3336
3337 if (likely(rc == 0)) {
3338 _pmcraid_fire_command(cmd);
3339 } else {
3340 pmcraid_err("queuecommand could not build ioadl\n");
3341 pmcraid_return_cmd(cmd);
3342 rc = SCSI_MLQUEUE_HOST_BUSY;
3343 }
3344
3345 return rc;
3346}
3347
3348static DEF_SCSI_QCMD(pmcraid_queuecommand)
3349
3350/*
3351 * pmcraid_open -char node "open" entry, allowed only users with admin access
3352 */
3353static int pmcraid_chr_open(struct inode *inode, struct file *filep)
3354{
3355 struct pmcraid_instance *pinstance;
3356
3357 if (!capable(CAP_SYS_ADMIN))
3358 return -EACCES;
3359
3360 /* Populate adapter instance * pointer for use by ioctl */
3361 pinstance = container_of(inode->i_cdev, struct pmcraid_instance, cdev);
3362 filep->private_data = pinstance;
3363
3364 return 0;
3365}
3366
3367/*
3368 * pmcraid_fasync - Async notifier registration from applications
3369 *
3370 * This function adds the calling process to a driver global queue. When an
3371 * event occurs, SIGIO will be sent to all processes in this queue.
3372 */
3373static int pmcraid_chr_fasync(int fd, struct file *filep, int mode)
3374{
3375 struct pmcraid_instance *pinstance;
3376 int rc;
3377
3378 pinstance = filep->private_data;
3379 mutex_lock(&pinstance->aen_queue_lock);
3380 rc = fasync_helper(fd, filep, mode, &pinstance->aen_queue);
3381 mutex_unlock(&pinstance->aen_queue_lock);
3382
3383 return rc;
3384}
3385
3386/**
3387 * pmcraid_ioctl_driver - ioctl handler for commands handled by driver itself
3388 *
3389 * @pinstance: pointer to adapter instance structure
3390 * @cmd: ioctl command passed in
3391 * @buflen: length of user_buffer
3392 * @user_buffer: user buffer pointer
3393 *
3394 * Return Value
3395 * 0 in case of success, otherwise appropriate error code
3396 */
3397static long pmcraid_ioctl_driver(
3398 struct pmcraid_instance *pinstance,
3399 unsigned int cmd,
3400 unsigned int buflen,
3401 void __user *user_buffer
3402)
3403{
3404 int rc = -ENOSYS;
3405
3406 switch (cmd) {
3407 case PMCRAID_IOCTL_RESET_ADAPTER:
3408 pmcraid_reset_bringup(pinstance);
3409 rc = 0;
3410 break;
3411
3412 default:
3413 break;
3414 }
3415
3416 return rc;
3417}
3418
3419/**
3420 * pmcraid_check_ioctl_buffer - check for proper access to user buffer
3421 *
3422 * @cmd: ioctl command
3423 * @arg: user buffer
3424 * @hdr: pointer to kernel memory for pmcraid_ioctl_header
3425 *
3426 * Return Value
3427 * negetive error code if there are access issues, otherwise zero.
3428 * Upon success, returns ioctl header copied out of user buffer.
3429 */
3430
3431static int pmcraid_check_ioctl_buffer(
3432 int cmd,
3433 void __user *arg,
3434 struct pmcraid_ioctl_header *hdr
3435)
3436{
3437 int rc;
3438
3439 if (copy_from_user(hdr, arg, sizeof(struct pmcraid_ioctl_header))) {
3440 pmcraid_err("couldn't copy ioctl header from user buffer\n");
3441 return -EFAULT;
3442 }
3443
3444 /* check for valid driver signature */
3445 rc = memcmp(hdr->signature,
3446 PMCRAID_IOCTL_SIGNATURE,
3447 sizeof(hdr->signature));
3448 if (rc) {
3449 pmcraid_err("signature verification failed\n");
3450 return -EINVAL;
3451 }
3452
3453 return 0;
3454}
3455
3456/*
3457 * pmcraid_ioctl - char node ioctl entry point
3458 */
3459static long pmcraid_chr_ioctl(
3460 struct file *filep,
3461 unsigned int cmd,
3462 unsigned long arg
3463)
3464{
3465 struct pmcraid_instance *pinstance = NULL;
3466 struct pmcraid_ioctl_header *hdr = NULL;
3467 void __user *argp = (void __user *)arg;
3468 int retval = -ENOTTY;
3469
3470 hdr = kmalloc(sizeof(struct pmcraid_ioctl_header), GFP_KERNEL);
3471
3472 if (!hdr) {
3473 pmcraid_err("failed to allocate memory for ioctl header\n");
3474 return -ENOMEM;
3475 }
3476
3477 retval = pmcraid_check_ioctl_buffer(cmd, argp, hdr);
3478
3479 if (retval) {
3480 pmcraid_info("chr_ioctl: header check failed\n");
3481 kfree(hdr);
3482 return retval;
3483 }
3484
3485 pinstance = filep->private_data;
3486
3487 if (!pinstance) {
3488 pmcraid_info("adapter instance is not found\n");
3489 kfree(hdr);
3490 return -ENOTTY;
3491 }
3492
3493 switch (_IOC_TYPE(cmd)) {
3494
3495 case PMCRAID_DRIVER_IOCTL:
3496 arg += sizeof(struct pmcraid_ioctl_header);
3497 retval = pmcraid_ioctl_driver(pinstance, cmd,
3498 hdr->buffer_length, argp);
3499 break;
3500
3501 default:
3502 retval = -ENOTTY;
3503 break;
3504 }
3505
3506 kfree(hdr);
3507
3508 return retval;
3509}
3510
3511/*
3512 * File operations structure for management interface
3513 */
3514static const struct file_operations pmcraid_fops = {
3515 .owner = THIS_MODULE,
3516 .open = pmcraid_chr_open,
3517 .fasync = pmcraid_chr_fasync,
3518 .unlocked_ioctl = pmcraid_chr_ioctl,
3519 .compat_ioctl = compat_ptr_ioctl,
3520 .llseek = noop_llseek,
3521};
3522
3523
3524
3525
3526/**
3527 * pmcraid_show_log_level - Display adapter's error logging level
3528 * @dev: class device struct
3529 * @attr: unused
3530 * @buf: buffer
3531 *
3532 * Return value:
3533 * number of bytes printed to buffer
3534 */
3535static ssize_t pmcraid_show_log_level(
3536 struct device *dev,
3537 struct device_attribute *attr,
3538 char *buf)
3539{
3540 struct Scsi_Host *shost = class_to_shost(dev);
3541 struct pmcraid_instance *pinstance =
3542 (struct pmcraid_instance *)shost->hostdata;
3543 return snprintf(buf, PAGE_SIZE, "%d\n", pinstance->current_log_level);
3544}
3545
3546/**
3547 * pmcraid_store_log_level - Change the adapter's error logging level
3548 * @dev: class device struct
3549 * @attr: unused
3550 * @buf: buffer
3551 * @count: not used
3552 *
3553 * Return value:
3554 * number of bytes printed to buffer
3555 */
3556static ssize_t pmcraid_store_log_level(
3557 struct device *dev,
3558 struct device_attribute *attr,
3559 const char *buf,
3560 size_t count
3561)
3562{
3563 struct Scsi_Host *shost;
3564 struct pmcraid_instance *pinstance;
3565 u8 val;
3566
3567 if (kstrtou8(buf, 10, &val))
3568 return -EINVAL;
3569 /* log-level should be from 0 to 2 */
3570 if (val > 2)
3571 return -EINVAL;
3572
3573 shost = class_to_shost(dev);
3574 pinstance = (struct pmcraid_instance *)shost->hostdata;
3575 pinstance->current_log_level = val;
3576
3577 return strlen(buf);
3578}
3579
3580static struct device_attribute pmcraid_log_level_attr = {
3581 .attr = {
3582 .name = "log_level",
3583 .mode = S_IRUGO | S_IWUSR,
3584 },
3585 .show = pmcraid_show_log_level,
3586 .store = pmcraid_store_log_level,
3587};
3588
3589/**
3590 * pmcraid_show_drv_version - Display driver version
3591 * @dev: class device struct
3592 * @attr: unused
3593 * @buf: buffer
3594 *
3595 * Return value:
3596 * number of bytes printed to buffer
3597 */
3598static ssize_t pmcraid_show_drv_version(
3599 struct device *dev,
3600 struct device_attribute *attr,
3601 char *buf
3602)
3603{
3604 return snprintf(buf, PAGE_SIZE, "version: %s\n",
3605 PMCRAID_DRIVER_VERSION);
3606}
3607
3608static struct device_attribute pmcraid_driver_version_attr = {
3609 .attr = {
3610 .name = "drv_version",
3611 .mode = S_IRUGO,
3612 },
3613 .show = pmcraid_show_drv_version,
3614};
3615
3616/**
3617 * pmcraid_show_adapter_id - Display driver assigned adapter id
3618 * @dev: class device struct
3619 * @attr: unused
3620 * @buf: buffer
3621 *
3622 * Return value:
3623 * number of bytes printed to buffer
3624 */
3625static ssize_t pmcraid_show_adapter_id(
3626 struct device *dev,
3627 struct device_attribute *attr,
3628 char *buf
3629)
3630{
3631 struct Scsi_Host *shost = class_to_shost(dev);
3632 struct pmcraid_instance *pinstance =
3633 (struct pmcraid_instance *)shost->hostdata;
3634 u32 adapter_id = pci_dev_id(pinstance->pdev);
3635 u32 aen_group = pmcraid_event_family.id;
3636
3637 return snprintf(buf, PAGE_SIZE,
3638 "adapter id: %d\nminor: %d\naen group: %d\n",
3639 adapter_id, MINOR(pinstance->cdev.dev), aen_group);
3640}
3641
3642static struct device_attribute pmcraid_adapter_id_attr = {
3643 .attr = {
3644 .name = "adapter_id",
3645 .mode = S_IRUGO,
3646 },
3647 .show = pmcraid_show_adapter_id,
3648};
3649
3650static struct attribute *pmcraid_host_attrs[] = {
3651 &pmcraid_log_level_attr.attr,
3652 &pmcraid_driver_version_attr.attr,
3653 &pmcraid_adapter_id_attr.attr,
3654 NULL,
3655};
3656
3657ATTRIBUTE_GROUPS(pmcraid_host);
3658
3659/* host template structure for pmcraid driver */
3660static const struct scsi_host_template pmcraid_host_template = {
3661 .module = THIS_MODULE,
3662 .name = PMCRAID_DRIVER_NAME,
3663 .queuecommand = pmcraid_queuecommand,
3664 .eh_abort_handler = pmcraid_eh_abort_handler,
3665 .eh_bus_reset_handler = pmcraid_eh_bus_reset_handler,
3666 .eh_target_reset_handler = pmcraid_eh_target_reset_handler,
3667 .eh_device_reset_handler = pmcraid_eh_device_reset_handler,
3668 .eh_host_reset_handler = pmcraid_eh_host_reset_handler,
3669
3670 .slave_alloc = pmcraid_slave_alloc,
3671 .slave_configure = pmcraid_slave_configure,
3672 .slave_destroy = pmcraid_slave_destroy,
3673 .change_queue_depth = pmcraid_change_queue_depth,
3674 .can_queue = PMCRAID_MAX_IO_CMD,
3675 .this_id = -1,
3676 .sg_tablesize = PMCRAID_MAX_IOADLS,
3677 .max_sectors = PMCRAID_IOA_MAX_SECTORS,
3678 .no_write_same = 1,
3679 .cmd_per_lun = PMCRAID_MAX_CMD_PER_LUN,
3680 .shost_groups = pmcraid_host_groups,
3681 .proc_name = PMCRAID_DRIVER_NAME,
3682};
3683
3684/*
3685 * pmcraid_isr_msix - implements MSI-X interrupt handling routine
3686 * @irq: interrupt vector number
3687 * @dev_id: pointer hrrq_vector
3688 *
3689 * Return Value
3690 * IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
3691 */
3692
3693static irqreturn_t pmcraid_isr_msix(int irq, void *dev_id)
3694{
3695 struct pmcraid_isr_param *hrrq_vector;
3696 struct pmcraid_instance *pinstance;
3697 unsigned long lock_flags;
3698 u32 intrs_val;
3699 int hrrq_id;
3700
3701 hrrq_vector = (struct pmcraid_isr_param *)dev_id;
3702 hrrq_id = hrrq_vector->hrrq_id;
3703 pinstance = hrrq_vector->drv_inst;
3704
3705 if (!hrrq_id) {
3706 /* Read the interrupt */
3707 intrs_val = pmcraid_read_interrupts(pinstance);
3708 if (intrs_val &&
3709 ((ioread32(pinstance->int_regs.host_ioa_interrupt_reg)
3710 & DOORBELL_INTR_MSIX_CLR) == 0)) {
3711 /* Any error interrupts including unit_check,
3712 * initiate IOA reset.In case of unit check indicate
3713 * to reset_sequence that IOA unit checked and prepare
3714 * for a dump during reset sequence
3715 */
3716 if (intrs_val & PMCRAID_ERROR_INTERRUPTS) {
3717 if (intrs_val & INTRS_IOA_UNIT_CHECK)
3718 pinstance->ioa_unit_check = 1;
3719
3720 pmcraid_err("ISR: error interrupts: %x \
3721 initiating reset\n", intrs_val);
3722 spin_lock_irqsave(pinstance->host->host_lock,
3723 lock_flags);
3724 pmcraid_initiate_reset(pinstance);
3725 spin_unlock_irqrestore(
3726 pinstance->host->host_lock,
3727 lock_flags);
3728 }
3729 /* If interrupt was as part of the ioa initialization,
3730 * clear it. Delete the timer and wakeup the
3731 * reset engine to proceed with reset sequence
3732 */
3733 if (intrs_val & INTRS_TRANSITION_TO_OPERATIONAL)
3734 pmcraid_clr_trans_op(pinstance);
3735
3736 /* Clear the interrupt register by writing
3737 * to host to ioa doorbell. Once done
3738 * FW will clear the interrupt.
3739 */
3740 iowrite32(DOORBELL_INTR_MSIX_CLR,
3741 pinstance->int_regs.host_ioa_interrupt_reg);
3742 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
3743
3744
3745 }
3746 }
3747
3748 tasklet_schedule(&(pinstance->isr_tasklet[hrrq_id]));
3749
3750 return IRQ_HANDLED;
3751}
3752
3753/**
3754 * pmcraid_isr - implements legacy interrupt handling routine
3755 *
3756 * @irq: interrupt vector number
3757 * @dev_id: pointer hrrq_vector
3758 *
3759 * Return Value
3760 * IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
3761 */
3762static irqreturn_t pmcraid_isr(int irq, void *dev_id)
3763{
3764 struct pmcraid_isr_param *hrrq_vector;
3765 struct pmcraid_instance *pinstance;
3766 u32 intrs;
3767 unsigned long lock_flags;
3768 int hrrq_id = 0;
3769
3770 /* In case of legacy interrupt mode where interrupts are shared across
3771 * isrs, it may be possible that the current interrupt is not from IOA
3772 */
3773 if (!dev_id) {
3774 printk(KERN_INFO "%s(): NULL host pointer\n", __func__);
3775 return IRQ_NONE;
3776 }
3777 hrrq_vector = (struct pmcraid_isr_param *)dev_id;
3778 pinstance = hrrq_vector->drv_inst;
3779
3780 intrs = pmcraid_read_interrupts(pinstance);
3781
3782 if (unlikely((intrs & PMCRAID_PCI_INTERRUPTS) == 0))
3783 return IRQ_NONE;
3784
3785 /* Any error interrupts including unit_check, initiate IOA reset.
3786 * In case of unit check indicate to reset_sequence that IOA unit
3787 * checked and prepare for a dump during reset sequence
3788 */
3789 if (intrs & PMCRAID_ERROR_INTERRUPTS) {
3790
3791 if (intrs & INTRS_IOA_UNIT_CHECK)
3792 pinstance->ioa_unit_check = 1;
3793
3794 iowrite32(intrs,
3795 pinstance->int_regs.ioa_host_interrupt_clr_reg);
3796 pmcraid_err("ISR: error interrupts: %x initiating reset\n",
3797 intrs);
3798 intrs = ioread32(
3799 pinstance->int_regs.ioa_host_interrupt_clr_reg);
3800 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
3801 pmcraid_initiate_reset(pinstance);
3802 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
3803 } else {
3804 /* If interrupt was as part of the ioa initialization,
3805 * clear. Delete the timer and wakeup the
3806 * reset engine to proceed with reset sequence
3807 */
3808 if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
3809 pmcraid_clr_trans_op(pinstance);
3810 } else {
3811 iowrite32(intrs,
3812 pinstance->int_regs.ioa_host_interrupt_clr_reg);
3813 ioread32(
3814 pinstance->int_regs.ioa_host_interrupt_clr_reg);
3815
3816 tasklet_schedule(
3817 &(pinstance->isr_tasklet[hrrq_id]));
3818 }
3819 }
3820
3821 return IRQ_HANDLED;
3822}
3823
3824
3825/**
3826 * pmcraid_worker_function - worker thread function
3827 *
3828 * @workp: pointer to struct work queue
3829 *
3830 * Return Value
3831 * None
3832 */
3833
3834static void pmcraid_worker_function(struct work_struct *workp)
3835{
3836 struct pmcraid_instance *pinstance;
3837 struct pmcraid_resource_entry *res;
3838 struct pmcraid_resource_entry *temp;
3839 struct scsi_device *sdev;
3840 unsigned long lock_flags;
3841 unsigned long host_lock_flags;
3842 u16 fw_version;
3843 u8 bus, target, lun;
3844
3845 pinstance = container_of(workp, struct pmcraid_instance, worker_q);
3846 /* add resources only after host is added into system */
3847 if (!atomic_read(&pinstance->expose_resources))
3848 return;
3849
3850 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
3851
3852 spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
3853 list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue) {
3854
3855 if (res->change_detected == RES_CHANGE_DEL && res->scsi_dev) {
3856 sdev = res->scsi_dev;
3857
3858 /* host_lock must be held before calling
3859 * scsi_device_get
3860 */
3861 spin_lock_irqsave(pinstance->host->host_lock,
3862 host_lock_flags);
3863 if (!scsi_device_get(sdev)) {
3864 spin_unlock_irqrestore(
3865 pinstance->host->host_lock,
3866 host_lock_flags);
3867 pmcraid_info("deleting %x from midlayer\n",
3868 res->cfg_entry.resource_address);
3869 list_move_tail(&res->queue,
3870 &pinstance->free_res_q);
3871 spin_unlock_irqrestore(
3872 &pinstance->resource_lock,
3873 lock_flags);
3874 scsi_remove_device(sdev);
3875 scsi_device_put(sdev);
3876 spin_lock_irqsave(&pinstance->resource_lock,
3877 lock_flags);
3878 res->change_detected = 0;
3879 } else {
3880 spin_unlock_irqrestore(
3881 pinstance->host->host_lock,
3882 host_lock_flags);
3883 }
3884 }
3885 }
3886
3887 list_for_each_entry(res, &pinstance->used_res_q, queue) {
3888
3889 if (res->change_detected == RES_CHANGE_ADD) {
3890
3891 if (!pmcraid_expose_resource(fw_version,
3892 &res->cfg_entry))
3893 continue;
3894
3895 if (RES_IS_VSET(res->cfg_entry)) {
3896 bus = PMCRAID_VSET_BUS_ID;
3897 if (fw_version <= PMCRAID_FW_VERSION_1)
3898 target = res->cfg_entry.unique_flags1;
3899 else
3900 target = le16_to_cpu(res->cfg_entry.array_id) & 0xFF;
3901 lun = PMCRAID_VSET_LUN_ID;
3902 } else {
3903 bus = PMCRAID_PHYS_BUS_ID;
3904 target =
3905 RES_TARGET(
3906 res->cfg_entry.resource_address);
3907 lun = RES_LUN(res->cfg_entry.resource_address);
3908 }
3909
3910 res->change_detected = 0;
3911 spin_unlock_irqrestore(&pinstance->resource_lock,
3912 lock_flags);
3913 scsi_add_device(pinstance->host, bus, target, lun);
3914 spin_lock_irqsave(&pinstance->resource_lock,
3915 lock_flags);
3916 }
3917 }
3918
3919 spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
3920}
3921
3922/**
3923 * pmcraid_tasklet_function - Tasklet function
3924 *
3925 * @instance: pointer to msix param structure
3926 *
3927 * Return Value
3928 * None
3929 */
3930static void pmcraid_tasklet_function(unsigned long instance)
3931{
3932 struct pmcraid_isr_param *hrrq_vector;
3933 struct pmcraid_instance *pinstance;
3934 unsigned long hrrq_lock_flags;
3935 unsigned long pending_lock_flags;
3936 unsigned long host_lock_flags;
3937 spinlock_t *lockp; /* hrrq buffer lock */
3938 int id;
3939 u32 resp;
3940
3941 hrrq_vector = (struct pmcraid_isr_param *)instance;
3942 pinstance = hrrq_vector->drv_inst;
3943 id = hrrq_vector->hrrq_id;
3944 lockp = &(pinstance->hrrq_lock[id]);
3945
3946 /* loop through each of the commands responded by IOA. Each HRRQ buf is
3947 * protected by its own lock. Traversals must be done within this lock
3948 * as there may be multiple tasklets running on multiple CPUs. Note
3949 * that the lock is held just for picking up the response handle and
3950 * manipulating hrrq_curr/toggle_bit values.
3951 */
3952 spin_lock_irqsave(lockp, hrrq_lock_flags);
3953
3954 resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
3955
3956 while ((resp & HRRQ_TOGGLE_BIT) ==
3957 pinstance->host_toggle_bit[id]) {
3958
3959 int cmd_index = resp >> 2;
3960 struct pmcraid_cmd *cmd = NULL;
3961
3962 if (pinstance->hrrq_curr[id] < pinstance->hrrq_end[id]) {
3963 pinstance->hrrq_curr[id]++;
3964 } else {
3965 pinstance->hrrq_curr[id] = pinstance->hrrq_start[id];
3966 pinstance->host_toggle_bit[id] ^= 1u;
3967 }
3968
3969 if (cmd_index >= PMCRAID_MAX_CMD) {
3970 /* In case of invalid response handle, log message */
3971 pmcraid_err("Invalid response handle %d\n", cmd_index);
3972 resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
3973 continue;
3974 }
3975
3976 cmd = pinstance->cmd_list[cmd_index];
3977 spin_unlock_irqrestore(lockp, hrrq_lock_flags);
3978
3979 spin_lock_irqsave(&pinstance->pending_pool_lock,
3980 pending_lock_flags);
3981 list_del(&cmd->free_list);
3982 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
3983 pending_lock_flags);
3984 del_timer(&cmd->timer);
3985 atomic_dec(&pinstance->outstanding_cmds);
3986
3987 if (cmd->cmd_done == pmcraid_ioa_reset) {
3988 spin_lock_irqsave(pinstance->host->host_lock,
3989 host_lock_flags);
3990 cmd->cmd_done(cmd);
3991 spin_unlock_irqrestore(pinstance->host->host_lock,
3992 host_lock_flags);
3993 } else if (cmd->cmd_done != NULL) {
3994 cmd->cmd_done(cmd);
3995 }
3996 /* loop over until we are done with all responses */
3997 spin_lock_irqsave(lockp, hrrq_lock_flags);
3998 resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
3999 }
4000
4001 spin_unlock_irqrestore(lockp, hrrq_lock_flags);
4002}
4003
4004/**
4005 * pmcraid_unregister_interrupt_handler - de-register interrupts handlers
4006 * @pinstance: pointer to adapter instance structure
4007 *
4008 * This routine un-registers registered interrupt handler and
4009 * also frees irqs/vectors.
4010 *
4011 * Retun Value
4012 * None
4013 */
4014static
4015void pmcraid_unregister_interrupt_handler(struct pmcraid_instance *pinstance)
4016{
4017 struct pci_dev *pdev = pinstance->pdev;
4018 int i;
4019
4020 for (i = 0; i < pinstance->num_hrrq; i++)
4021 free_irq(pci_irq_vector(pdev, i), &pinstance->hrrq_vector[i]);
4022
4023 pinstance->interrupt_mode = 0;
4024 pci_free_irq_vectors(pdev);
4025}
4026
4027/**
4028 * pmcraid_register_interrupt_handler - registers interrupt handler
4029 * @pinstance: pointer to per-adapter instance structure
4030 *
4031 * Return Value
4032 * 0 on success, non-zero error code otherwise.
4033 */
4034static int
4035pmcraid_register_interrupt_handler(struct pmcraid_instance *pinstance)
4036{
4037 struct pci_dev *pdev = pinstance->pdev;
4038 unsigned int irq_flag = PCI_IRQ_LEGACY, flag;
4039 int num_hrrq, rc, i;
4040 irq_handler_t isr;
4041
4042 if (pmcraid_enable_msix)
4043 irq_flag |= PCI_IRQ_MSIX;
4044
4045 num_hrrq = pci_alloc_irq_vectors(pdev, 1, PMCRAID_NUM_MSIX_VECTORS,
4046 irq_flag);
4047 if (num_hrrq < 0)
4048 return num_hrrq;
4049
4050 if (pdev->msix_enabled) {
4051 flag = 0;
4052 isr = pmcraid_isr_msix;
4053 } else {
4054 flag = IRQF_SHARED;
4055 isr = pmcraid_isr;
4056 }
4057
4058 for (i = 0; i < num_hrrq; i++) {
4059 struct pmcraid_isr_param *vec = &pinstance->hrrq_vector[i];
4060
4061 vec->hrrq_id = i;
4062 vec->drv_inst = pinstance;
4063 rc = request_irq(pci_irq_vector(pdev, i), isr, flag,
4064 PMCRAID_DRIVER_NAME, vec);
4065 if (rc)
4066 goto out_unwind;
4067 }
4068
4069 pinstance->num_hrrq = num_hrrq;
4070 if (pdev->msix_enabled) {
4071 pinstance->interrupt_mode = 1;
4072 iowrite32(DOORBELL_INTR_MODE_MSIX,
4073 pinstance->int_regs.host_ioa_interrupt_reg);
4074 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
4075 }
4076
4077 return 0;
4078
4079out_unwind:
4080 while (--i >= 0)
4081 free_irq(pci_irq_vector(pdev, i), &pinstance->hrrq_vector[i]);
4082 pci_free_irq_vectors(pdev);
4083 return rc;
4084}
4085
4086/**
4087 * pmcraid_release_cmd_blocks - release buufers allocated for command blocks
4088 * @pinstance: per adapter instance structure pointer
4089 * @max_index: number of buffer blocks to release
4090 *
4091 * Return Value
4092 * None
4093 */
4094static void
4095pmcraid_release_cmd_blocks(struct pmcraid_instance *pinstance, int max_index)
4096{
4097 int i;
4098 for (i = 0; i < max_index; i++) {
4099 kmem_cache_free(pinstance->cmd_cachep, pinstance->cmd_list[i]);
4100 pinstance->cmd_list[i] = NULL;
4101 }
4102 kmem_cache_destroy(pinstance->cmd_cachep);
4103 pinstance->cmd_cachep = NULL;
4104}
4105
4106/**
4107 * pmcraid_release_control_blocks - releases buffers alloced for control blocks
4108 * @pinstance: pointer to per adapter instance structure
4109 * @max_index: number of buffers (from 0 onwards) to release
4110 *
4111 * This function assumes that the command blocks for which control blocks are
4112 * linked are not released.
4113 *
4114 * Return Value
4115 * None
4116 */
4117static void
4118pmcraid_release_control_blocks(
4119 struct pmcraid_instance *pinstance,
4120 int max_index
4121)
4122{
4123 int i;
4124
4125 if (pinstance->control_pool == NULL)
4126 return;
4127
4128 for (i = 0; i < max_index; i++) {
4129 dma_pool_free(pinstance->control_pool,
4130 pinstance->cmd_list[i]->ioa_cb,
4131 pinstance->cmd_list[i]->ioa_cb_bus_addr);
4132 pinstance->cmd_list[i]->ioa_cb = NULL;
4133 pinstance->cmd_list[i]->ioa_cb_bus_addr = 0;
4134 }
4135 dma_pool_destroy(pinstance->control_pool);
4136 pinstance->control_pool = NULL;
4137}
4138
4139/**
4140 * pmcraid_allocate_cmd_blocks - allocate memory for cmd block structures
4141 * @pinstance: pointer to per adapter instance structure
4142 *
4143 * Allocates memory for command blocks using kernel slab allocator.
4144 *
4145 * Return Value
4146 * 0 in case of success; -ENOMEM in case of failure
4147 */
4148static int pmcraid_allocate_cmd_blocks(struct pmcraid_instance *pinstance)
4149{
4150 int i;
4151
4152 sprintf(pinstance->cmd_pool_name, "pmcraid_cmd_pool_%d",
4153 pinstance->host->unique_id);
4154
4155
4156 pinstance->cmd_cachep = kmem_cache_create(
4157 pinstance->cmd_pool_name,
4158 sizeof(struct pmcraid_cmd), 0,
4159 SLAB_HWCACHE_ALIGN, NULL);
4160 if (!pinstance->cmd_cachep)
4161 return -ENOMEM;
4162
4163 for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4164 pinstance->cmd_list[i] =
4165 kmem_cache_alloc(pinstance->cmd_cachep, GFP_KERNEL);
4166 if (!pinstance->cmd_list[i]) {
4167 pmcraid_release_cmd_blocks(pinstance, i);
4168 return -ENOMEM;
4169 }
4170 }
4171 return 0;
4172}
4173
4174/**
4175 * pmcraid_allocate_control_blocks - allocates memory control blocks
4176 * @pinstance : pointer to per adapter instance structure
4177 *
4178 * This function allocates PCI memory for DMAable buffers like IOARCB, IOADLs
4179 * and IOASAs. This is called after command blocks are already allocated.
4180 *
4181 * Return Value
4182 * 0 in case it can allocate all control blocks, otherwise -ENOMEM
4183 */
4184static int pmcraid_allocate_control_blocks(struct pmcraid_instance *pinstance)
4185{
4186 int i;
4187
4188 sprintf(pinstance->ctl_pool_name, "pmcraid_control_pool_%d",
4189 pinstance->host->unique_id);
4190
4191 pinstance->control_pool =
4192 dma_pool_create(pinstance->ctl_pool_name,
4193 &pinstance->pdev->dev,
4194 sizeof(struct pmcraid_control_block),
4195 PMCRAID_IOARCB_ALIGNMENT, 0);
4196
4197 if (!pinstance->control_pool)
4198 return -ENOMEM;
4199
4200 for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4201 pinstance->cmd_list[i]->ioa_cb =
4202 dma_pool_zalloc(
4203 pinstance->control_pool,
4204 GFP_KERNEL,
4205 &(pinstance->cmd_list[i]->ioa_cb_bus_addr));
4206
4207 if (!pinstance->cmd_list[i]->ioa_cb) {
4208 pmcraid_release_control_blocks(pinstance, i);
4209 return -ENOMEM;
4210 }
4211 }
4212 return 0;
4213}
4214
4215/**
4216 * pmcraid_release_host_rrqs - release memory allocated for hrrq buffer(s)
4217 * @pinstance: pointer to per adapter instance structure
4218 * @maxindex: size of hrrq buffer pointer array
4219 *
4220 * Return Value
4221 * None
4222 */
4223static void
4224pmcraid_release_host_rrqs(struct pmcraid_instance *pinstance, int maxindex)
4225{
4226 int i;
4227
4228 for (i = 0; i < maxindex; i++) {
4229 dma_free_coherent(&pinstance->pdev->dev,
4230 HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD,
4231 pinstance->hrrq_start[i],
4232 pinstance->hrrq_start_bus_addr[i]);
4233
4234 /* reset pointers and toggle bit to zeros */
4235 pinstance->hrrq_start[i] = NULL;
4236 pinstance->hrrq_start_bus_addr[i] = 0;
4237 pinstance->host_toggle_bit[i] = 0;
4238 }
4239}
4240
4241/**
4242 * pmcraid_allocate_host_rrqs - Allocate and initialize host RRQ buffers
4243 * @pinstance: pointer to per adapter instance structure
4244 *
4245 * Return value
4246 * 0 hrrq buffers are allocated, -ENOMEM otherwise.
4247 */
4248static int pmcraid_allocate_host_rrqs(struct pmcraid_instance *pinstance)
4249{
4250 int i, buffer_size;
4251
4252 buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
4253
4254 for (i = 0; i < pinstance->num_hrrq; i++) {
4255 pinstance->hrrq_start[i] =
4256 dma_alloc_coherent(&pinstance->pdev->dev, buffer_size,
4257 &pinstance->hrrq_start_bus_addr[i],
4258 GFP_KERNEL);
4259 if (!pinstance->hrrq_start[i]) {
4260 pmcraid_err("pci_alloc failed for hrrq vector : %d\n",
4261 i);
4262 pmcraid_release_host_rrqs(pinstance, i);
4263 return -ENOMEM;
4264 }
4265
4266 pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
4267 pinstance->hrrq_end[i] =
4268 pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
4269 pinstance->host_toggle_bit[i] = 1;
4270 spin_lock_init(&pinstance->hrrq_lock[i]);
4271 }
4272 return 0;
4273}
4274
4275/**
4276 * pmcraid_release_hcams - release HCAM buffers
4277 *
4278 * @pinstance: pointer to per adapter instance structure
4279 *
4280 * Return value
4281 * none
4282 */
4283static void pmcraid_release_hcams(struct pmcraid_instance *pinstance)
4284{
4285 if (pinstance->ccn.msg != NULL) {
4286 dma_free_coherent(&pinstance->pdev->dev,
4287 PMCRAID_AEN_HDR_SIZE +
4288 sizeof(struct pmcraid_hcam_ccn_ext),
4289 pinstance->ccn.msg,
4290 pinstance->ccn.baddr);
4291
4292 pinstance->ccn.msg = NULL;
4293 pinstance->ccn.hcam = NULL;
4294 pinstance->ccn.baddr = 0;
4295 }
4296
4297 if (pinstance->ldn.msg != NULL) {
4298 dma_free_coherent(&pinstance->pdev->dev,
4299 PMCRAID_AEN_HDR_SIZE +
4300 sizeof(struct pmcraid_hcam_ldn),
4301 pinstance->ldn.msg,
4302 pinstance->ldn.baddr);
4303
4304 pinstance->ldn.msg = NULL;
4305 pinstance->ldn.hcam = NULL;
4306 pinstance->ldn.baddr = 0;
4307 }
4308}
4309
4310/**
4311 * pmcraid_allocate_hcams - allocates HCAM buffers
4312 * @pinstance : pointer to per adapter instance structure
4313 *
4314 * Return Value:
4315 * 0 in case of successful allocation, non-zero otherwise
4316 */
4317static int pmcraid_allocate_hcams(struct pmcraid_instance *pinstance)
4318{
4319 pinstance->ccn.msg = dma_alloc_coherent(&pinstance->pdev->dev,
4320 PMCRAID_AEN_HDR_SIZE +
4321 sizeof(struct pmcraid_hcam_ccn_ext),
4322 &pinstance->ccn.baddr, GFP_KERNEL);
4323
4324 pinstance->ldn.msg = dma_alloc_coherent(&pinstance->pdev->dev,
4325 PMCRAID_AEN_HDR_SIZE +
4326 sizeof(struct pmcraid_hcam_ldn),
4327 &pinstance->ldn.baddr, GFP_KERNEL);
4328
4329 if (pinstance->ldn.msg == NULL || pinstance->ccn.msg == NULL) {
4330 pmcraid_release_hcams(pinstance);
4331 } else {
4332 pinstance->ccn.hcam =
4333 (void *)pinstance->ccn.msg + PMCRAID_AEN_HDR_SIZE;
4334 pinstance->ldn.hcam =
4335 (void *)pinstance->ldn.msg + PMCRAID_AEN_HDR_SIZE;
4336
4337 atomic_set(&pinstance->ccn.ignore, 0);
4338 atomic_set(&pinstance->ldn.ignore, 0);
4339 }
4340
4341 return (pinstance->ldn.msg == NULL) ? -ENOMEM : 0;
4342}
4343
4344/**
4345 * pmcraid_release_config_buffers - release config.table buffers
4346 * @pinstance: pointer to per adapter instance structure
4347 *
4348 * Return Value
4349 * none
4350 */
4351static void pmcraid_release_config_buffers(struct pmcraid_instance *pinstance)
4352{
4353 if (pinstance->cfg_table != NULL &&
4354 pinstance->cfg_table_bus_addr != 0) {
4355 dma_free_coherent(&pinstance->pdev->dev,
4356 sizeof(struct pmcraid_config_table),
4357 pinstance->cfg_table,
4358 pinstance->cfg_table_bus_addr);
4359 pinstance->cfg_table = NULL;
4360 pinstance->cfg_table_bus_addr = 0;
4361 }
4362
4363 if (pinstance->res_entries != NULL) {
4364 int i;
4365
4366 for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
4367 list_del(&pinstance->res_entries[i].queue);
4368 kfree(pinstance->res_entries);
4369 pinstance->res_entries = NULL;
4370 }
4371
4372 pmcraid_release_hcams(pinstance);
4373}
4374
4375/**
4376 * pmcraid_allocate_config_buffers - allocates DMAable memory for config table
4377 * @pinstance : pointer to per adapter instance structure
4378 *
4379 * Return Value
4380 * 0 for successful allocation, -ENOMEM for any failure
4381 */
4382static int pmcraid_allocate_config_buffers(struct pmcraid_instance *pinstance)
4383{
4384 int i;
4385
4386 pinstance->res_entries =
4387 kcalloc(PMCRAID_MAX_RESOURCES,
4388 sizeof(struct pmcraid_resource_entry),
4389 GFP_KERNEL);
4390
4391 if (NULL == pinstance->res_entries) {
4392 pmcraid_err("failed to allocate memory for resource table\n");
4393 return -ENOMEM;
4394 }
4395
4396 for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
4397 list_add_tail(&pinstance->res_entries[i].queue,
4398 &pinstance->free_res_q);
4399
4400 pinstance->cfg_table = dma_alloc_coherent(&pinstance->pdev->dev,
4401 sizeof(struct pmcraid_config_table),
4402 &pinstance->cfg_table_bus_addr,
4403 GFP_KERNEL);
4404
4405 if (NULL == pinstance->cfg_table) {
4406 pmcraid_err("couldn't alloc DMA memory for config table\n");
4407 pmcraid_release_config_buffers(pinstance);
4408 return -ENOMEM;
4409 }
4410
4411 if (pmcraid_allocate_hcams(pinstance)) {
4412 pmcraid_err("could not alloc DMA memory for HCAMS\n");
4413 pmcraid_release_config_buffers(pinstance);
4414 return -ENOMEM;
4415 }
4416
4417 return 0;
4418}
4419
4420/**
4421 * pmcraid_init_tasklets - registers tasklets for response handling
4422 *
4423 * @pinstance: pointer adapter instance structure
4424 *
4425 * Return value
4426 * none
4427 */
4428static void pmcraid_init_tasklets(struct pmcraid_instance *pinstance)
4429{
4430 int i;
4431 for (i = 0; i < pinstance->num_hrrq; i++)
4432 tasklet_init(&pinstance->isr_tasklet[i],
4433 pmcraid_tasklet_function,
4434 (unsigned long)&pinstance->hrrq_vector[i]);
4435}
4436
4437/**
4438 * pmcraid_kill_tasklets - destroys tasklets registered for response handling
4439 *
4440 * @pinstance: pointer to adapter instance structure
4441 *
4442 * Return value
4443 * none
4444 */
4445static void pmcraid_kill_tasklets(struct pmcraid_instance *pinstance)
4446{
4447 int i;
4448 for (i = 0; i < pinstance->num_hrrq; i++)
4449 tasklet_kill(&pinstance->isr_tasklet[i]);
4450}
4451
4452/**
4453 * pmcraid_release_buffers - release per-adapter buffers allocated
4454 *
4455 * @pinstance: pointer to adapter soft state
4456 *
4457 * Return Value
4458 * none
4459 */
4460static void pmcraid_release_buffers(struct pmcraid_instance *pinstance)
4461{
4462 pmcraid_release_config_buffers(pinstance);
4463 pmcraid_release_control_blocks(pinstance, PMCRAID_MAX_CMD);
4464 pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
4465 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
4466
4467 if (pinstance->inq_data != NULL) {
4468 dma_free_coherent(&pinstance->pdev->dev,
4469 sizeof(struct pmcraid_inquiry_data),
4470 pinstance->inq_data,
4471 pinstance->inq_data_baddr);
4472
4473 pinstance->inq_data = NULL;
4474 pinstance->inq_data_baddr = 0;
4475 }
4476
4477 if (pinstance->timestamp_data != NULL) {
4478 dma_free_coherent(&pinstance->pdev->dev,
4479 sizeof(struct pmcraid_timestamp_data),
4480 pinstance->timestamp_data,
4481 pinstance->timestamp_data_baddr);
4482
4483 pinstance->timestamp_data = NULL;
4484 pinstance->timestamp_data_baddr = 0;
4485 }
4486}
4487
4488/**
4489 * pmcraid_init_buffers - allocates memory and initializes various structures
4490 * @pinstance: pointer to per adapter instance structure
4491 *
4492 * This routine pre-allocates memory based on the type of block as below:
4493 * cmdblocks(PMCRAID_MAX_CMD): kernel memory using kernel's slab_allocator,
4494 * IOARCBs(PMCRAID_MAX_CMD) : DMAable memory, using pci pool allocator
4495 * config-table entries : DMAable memory using dma_alloc_coherent
4496 * HostRRQs : DMAable memory, using dma_alloc_coherent
4497 *
4498 * Return Value
4499 * 0 in case all of the blocks are allocated, -ENOMEM otherwise.
4500 */
4501static int pmcraid_init_buffers(struct pmcraid_instance *pinstance)
4502{
4503 int i;
4504
4505 if (pmcraid_allocate_host_rrqs(pinstance)) {
4506 pmcraid_err("couldn't allocate memory for %d host rrqs\n",
4507 pinstance->num_hrrq);
4508 return -ENOMEM;
4509 }
4510
4511 if (pmcraid_allocate_config_buffers(pinstance)) {
4512 pmcraid_err("couldn't allocate memory for config buffers\n");
4513 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
4514 return -ENOMEM;
4515 }
4516
4517 if (pmcraid_allocate_cmd_blocks(pinstance)) {
4518 pmcraid_err("couldn't allocate memory for cmd blocks\n");
4519 pmcraid_release_config_buffers(pinstance);
4520 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
4521 return -ENOMEM;
4522 }
4523
4524 if (pmcraid_allocate_control_blocks(pinstance)) {
4525 pmcraid_err("couldn't allocate memory control blocks\n");
4526 pmcraid_release_config_buffers(pinstance);
4527 pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
4528 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
4529 return -ENOMEM;
4530 }
4531
4532 /* allocate DMAable memory for page D0 INQUIRY buffer */
4533 pinstance->inq_data = dma_alloc_coherent(&pinstance->pdev->dev,
4534 sizeof(struct pmcraid_inquiry_data),
4535 &pinstance->inq_data_baddr, GFP_KERNEL);
4536 if (pinstance->inq_data == NULL) {
4537 pmcraid_err("couldn't allocate DMA memory for INQUIRY\n");
4538 pmcraid_release_buffers(pinstance);
4539 return -ENOMEM;
4540 }
4541
4542 /* allocate DMAable memory for set timestamp data buffer */
4543 pinstance->timestamp_data = dma_alloc_coherent(&pinstance->pdev->dev,
4544 sizeof(struct pmcraid_timestamp_data),
4545 &pinstance->timestamp_data_baddr,
4546 GFP_KERNEL);
4547 if (pinstance->timestamp_data == NULL) {
4548 pmcraid_err("couldn't allocate DMA memory for \
4549 set time_stamp \n");
4550 pmcraid_release_buffers(pinstance);
4551 return -ENOMEM;
4552 }
4553
4554
4555 /* Initialize all the command blocks and add them to free pool. No
4556 * need to lock (free_pool_lock) as this is done in initialization
4557 * itself
4558 */
4559 for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4560 struct pmcraid_cmd *cmdp = pinstance->cmd_list[i];
4561 pmcraid_init_cmdblk(cmdp, i);
4562 cmdp->drv_inst = pinstance;
4563 list_add_tail(&cmdp->free_list, &pinstance->free_cmd_pool);
4564 }
4565
4566 return 0;
4567}
4568
4569/**
4570 * pmcraid_reinit_buffers - resets various buffer pointers
4571 * @pinstance: pointer to adapter instance
4572 * Return value
4573 * none
4574 */
4575static void pmcraid_reinit_buffers(struct pmcraid_instance *pinstance)
4576{
4577 int i;
4578 int buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
4579
4580 for (i = 0; i < pinstance->num_hrrq; i++) {
4581 memset(pinstance->hrrq_start[i], 0, buffer_size);
4582 pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
4583 pinstance->hrrq_end[i] =
4584 pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
4585 pinstance->host_toggle_bit[i] = 1;
4586 }
4587}
4588
4589/**
4590 * pmcraid_init_instance - initialize per instance data structure
4591 * @pdev: pointer to pci device structure
4592 * @host: pointer to Scsi_Host structure
4593 * @mapped_pci_addr: memory mapped IOA configuration registers
4594 *
4595 * Return Value
4596 * 0 on success, non-zero in case of any failure
4597 */
4598static int pmcraid_init_instance(struct pci_dev *pdev, struct Scsi_Host *host,
4599 void __iomem *mapped_pci_addr)
4600{
4601 struct pmcraid_instance *pinstance =
4602 (struct pmcraid_instance *)host->hostdata;
4603
4604 pinstance->host = host;
4605 pinstance->pdev = pdev;
4606
4607 /* Initialize register addresses */
4608 pinstance->mapped_dma_addr = mapped_pci_addr;
4609
4610 /* Initialize chip-specific details */
4611 {
4612 struct pmcraid_chip_details *chip_cfg = pinstance->chip_cfg;
4613 struct pmcraid_interrupts *pint_regs = &pinstance->int_regs;
4614
4615 pinstance->ioarrin = mapped_pci_addr + chip_cfg->ioarrin;
4616
4617 pint_regs->ioa_host_interrupt_reg =
4618 mapped_pci_addr + chip_cfg->ioa_host_intr;
4619 pint_regs->ioa_host_interrupt_clr_reg =
4620 mapped_pci_addr + chip_cfg->ioa_host_intr_clr;
4621 pint_regs->ioa_host_msix_interrupt_reg =
4622 mapped_pci_addr + chip_cfg->ioa_host_msix_intr;
4623 pint_regs->host_ioa_interrupt_reg =
4624 mapped_pci_addr + chip_cfg->host_ioa_intr;
4625 pint_regs->host_ioa_interrupt_clr_reg =
4626 mapped_pci_addr + chip_cfg->host_ioa_intr_clr;
4627
4628 /* Current version of firmware exposes interrupt mask set
4629 * and mask clr registers through memory mapped bar0.
4630 */
4631 pinstance->mailbox = mapped_pci_addr + chip_cfg->mailbox;
4632 pinstance->ioa_status = mapped_pci_addr + chip_cfg->ioastatus;
4633 pint_regs->ioa_host_interrupt_mask_reg =
4634 mapped_pci_addr + chip_cfg->ioa_host_mask;
4635 pint_regs->ioa_host_interrupt_mask_clr_reg =
4636 mapped_pci_addr + chip_cfg->ioa_host_mask_clr;
4637 pint_regs->global_interrupt_mask_reg =
4638 mapped_pci_addr + chip_cfg->global_intr_mask;
4639 }
4640
4641 pinstance->ioa_reset_attempts = 0;
4642 init_waitqueue_head(&pinstance->reset_wait_q);
4643
4644 atomic_set(&pinstance->outstanding_cmds, 0);
4645 atomic_set(&pinstance->last_message_id, 0);
4646 atomic_set(&pinstance->expose_resources, 0);
4647
4648 INIT_LIST_HEAD(&pinstance->free_res_q);
4649 INIT_LIST_HEAD(&pinstance->used_res_q);
4650 INIT_LIST_HEAD(&pinstance->free_cmd_pool);
4651 INIT_LIST_HEAD(&pinstance->pending_cmd_pool);
4652
4653 spin_lock_init(&pinstance->free_pool_lock);
4654 spin_lock_init(&pinstance->pending_pool_lock);
4655 spin_lock_init(&pinstance->resource_lock);
4656 mutex_init(&pinstance->aen_queue_lock);
4657
4658 /* Work-queue (Shared) for deferred processing error handling */
4659 INIT_WORK(&pinstance->worker_q, pmcraid_worker_function);
4660
4661 /* Initialize the default log_level */
4662 pinstance->current_log_level = pmcraid_log_level;
4663
4664 /* Setup variables required for reset engine */
4665 pinstance->ioa_state = IOA_STATE_UNKNOWN;
4666 pinstance->reset_cmd = NULL;
4667 return 0;
4668}
4669
4670/**
4671 * pmcraid_shutdown - shutdown adapter controller.
4672 * @pdev: pci device struct
4673 *
4674 * Issues an adapter shutdown to the card waits for its completion
4675 *
4676 * Return value
4677 * none
4678 */
4679static void pmcraid_shutdown(struct pci_dev *pdev)
4680{
4681 struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
4682 pmcraid_reset_bringdown(pinstance);
4683}
4684
4685
4686/*
4687 * pmcraid_get_minor - returns unused minor number from minor number bitmap
4688 */
4689static unsigned short pmcraid_get_minor(void)
4690{
4691 int minor;
4692
4693 minor = find_first_zero_bit(pmcraid_minor, PMCRAID_MAX_ADAPTERS);
4694 __set_bit(minor, pmcraid_minor);
4695 return minor;
4696}
4697
4698/*
4699 * pmcraid_release_minor - releases given minor back to minor number bitmap
4700 */
4701static void pmcraid_release_minor(unsigned short minor)
4702{
4703 __clear_bit(minor, pmcraid_minor);
4704}
4705
4706/**
4707 * pmcraid_setup_chrdev - allocates a minor number and registers a char device
4708 *
4709 * @pinstance: pointer to adapter instance for which to register device
4710 *
4711 * Return value
4712 * 0 in case of success, otherwise non-zero
4713 */
4714static int pmcraid_setup_chrdev(struct pmcraid_instance *pinstance)
4715{
4716 int minor;
4717 int error;
4718
4719 minor = pmcraid_get_minor();
4720 cdev_init(&pinstance->cdev, &pmcraid_fops);
4721 pinstance->cdev.owner = THIS_MODULE;
4722
4723 error = cdev_add(&pinstance->cdev, MKDEV(pmcraid_major, minor), 1);
4724
4725 if (error)
4726 pmcraid_release_minor(minor);
4727 else
4728 device_create(&pmcraid_class, NULL, MKDEV(pmcraid_major, minor),
4729 NULL, "%s%u", PMCRAID_DEVFILE, minor);
4730 return error;
4731}
4732
4733/**
4734 * pmcraid_release_chrdev - unregisters per-adapter management interface
4735 *
4736 * @pinstance: pointer to adapter instance structure
4737 *
4738 * Return value
4739 * none
4740 */
4741static void pmcraid_release_chrdev(struct pmcraid_instance *pinstance)
4742{
4743 pmcraid_release_minor(MINOR(pinstance->cdev.dev));
4744 device_destroy(&pmcraid_class,
4745 MKDEV(pmcraid_major, MINOR(pinstance->cdev.dev)));
4746 cdev_del(&pinstance->cdev);
4747}
4748
4749/**
4750 * pmcraid_remove - IOA hot plug remove entry point
4751 * @pdev: pci device struct
4752 *
4753 * Return value
4754 * none
4755 */
4756static void pmcraid_remove(struct pci_dev *pdev)
4757{
4758 struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
4759
4760 /* remove the management interface (/dev file) for this device */
4761 pmcraid_release_chrdev(pinstance);
4762
4763 /* remove host template from scsi midlayer */
4764 scsi_remove_host(pinstance->host);
4765
4766 /* block requests from mid-layer */
4767 scsi_block_requests(pinstance->host);
4768
4769 /* initiate shutdown adapter */
4770 pmcraid_shutdown(pdev);
4771
4772 pmcraid_disable_interrupts(pinstance, ~0);
4773 flush_work(&pinstance->worker_q);
4774
4775 pmcraid_kill_tasklets(pinstance);
4776 pmcraid_unregister_interrupt_handler(pinstance);
4777 pmcraid_release_buffers(pinstance);
4778 iounmap(pinstance->mapped_dma_addr);
4779 pci_release_regions(pdev);
4780 scsi_host_put(pinstance->host);
4781 pci_disable_device(pdev);
4782
4783 return;
4784}
4785
4786/**
4787 * pmcraid_suspend - driver suspend entry point for power management
4788 * @dev: Device structure
4789 *
4790 * Return Value - 0 always
4791 */
4792static int __maybe_unused pmcraid_suspend(struct device *dev)
4793{
4794 struct pci_dev *pdev = to_pci_dev(dev);
4795 struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
4796
4797 pmcraid_shutdown(pdev);
4798 pmcraid_disable_interrupts(pinstance, ~0);
4799 pmcraid_kill_tasklets(pinstance);
4800 pmcraid_unregister_interrupt_handler(pinstance);
4801
4802 return 0;
4803}
4804
4805/**
4806 * pmcraid_resume - driver resume entry point PCI power management
4807 * @dev: Device structure
4808 *
4809 * Return Value - 0 in case of success. Error code in case of any failure
4810 */
4811static int __maybe_unused pmcraid_resume(struct device *dev)
4812{
4813 struct pci_dev *pdev = to_pci_dev(dev);
4814 struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
4815 struct Scsi_Host *host = pinstance->host;
4816 int rc = 0;
4817
4818 if (sizeof(dma_addr_t) == 4 ||
4819 dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)))
4820 rc = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
4821
4822 if (rc == 0)
4823 rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
4824
4825 if (rc != 0) {
4826 dev_err(&pdev->dev, "resume: Failed to set PCI DMA mask\n");
4827 goto disable_device;
4828 }
4829
4830 pmcraid_disable_interrupts(pinstance, ~0);
4831 atomic_set(&pinstance->outstanding_cmds, 0);
4832 rc = pmcraid_register_interrupt_handler(pinstance);
4833
4834 if (rc) {
4835 dev_err(&pdev->dev,
4836 "resume: couldn't register interrupt handlers\n");
4837 rc = -ENODEV;
4838 goto release_host;
4839 }
4840
4841 pmcraid_init_tasklets(pinstance);
4842 pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
4843
4844 /* Start with hard reset sequence which brings up IOA to operational
4845 * state as well as completes the reset sequence.
4846 */
4847 pinstance->ioa_hard_reset = 1;
4848
4849 /* Start IOA firmware initialization and bring card to Operational
4850 * state.
4851 */
4852 if (pmcraid_reset_bringup(pinstance)) {
4853 dev_err(&pdev->dev, "couldn't initialize IOA\n");
4854 rc = -ENODEV;
4855 goto release_tasklets;
4856 }
4857
4858 return 0;
4859
4860release_tasklets:
4861 pmcraid_disable_interrupts(pinstance, ~0);
4862 pmcraid_kill_tasklets(pinstance);
4863 pmcraid_unregister_interrupt_handler(pinstance);
4864
4865release_host:
4866 scsi_host_put(host);
4867
4868disable_device:
4869
4870 return rc;
4871}
4872
4873/**
4874 * pmcraid_complete_ioa_reset - Called by either timer or tasklet during
4875 * completion of the ioa reset
4876 * @cmd: pointer to reset command block
4877 */
4878static void pmcraid_complete_ioa_reset(struct pmcraid_cmd *cmd)
4879{
4880 struct pmcraid_instance *pinstance = cmd->drv_inst;
4881 unsigned long flags;
4882
4883 spin_lock_irqsave(pinstance->host->host_lock, flags);
4884 pmcraid_ioa_reset(cmd);
4885 spin_unlock_irqrestore(pinstance->host->host_lock, flags);
4886 scsi_unblock_requests(pinstance->host);
4887 schedule_work(&pinstance->worker_q);
4888}
4889
4890/**
4891 * pmcraid_set_supported_devs - sends SET SUPPORTED DEVICES to IOAFP
4892 *
4893 * @cmd: pointer to pmcraid_cmd structure
4894 *
4895 * Return Value
4896 * 0 for success or non-zero for failure cases
4897 */
4898static void pmcraid_set_supported_devs(struct pmcraid_cmd *cmd)
4899{
4900 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
4901 void (*cmd_done) (struct pmcraid_cmd *) = pmcraid_complete_ioa_reset;
4902
4903 pmcraid_reinit_cmdblk(cmd);
4904
4905 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
4906 ioarcb->request_type = REQ_TYPE_IOACMD;
4907 ioarcb->cdb[0] = PMCRAID_SET_SUPPORTED_DEVICES;
4908 ioarcb->cdb[1] = ALL_DEVICES_SUPPORTED;
4909
4910 /* If this was called as part of resource table reinitialization due to
4911 * lost CCN, it is enough to return the command block back to free pool
4912 * as part of set_supported_devs completion function.
4913 */
4914 if (cmd->drv_inst->reinit_cfg_table) {
4915 cmd->drv_inst->reinit_cfg_table = 0;
4916 cmd->release = 1;
4917 cmd_done = pmcraid_reinit_cfgtable_done;
4918 }
4919
4920 /* we will be done with the reset sequence after set supported devices,
4921 * setup the done function to return the command block back to free
4922 * pool
4923 */
4924 pmcraid_send_cmd(cmd,
4925 cmd_done,
4926 PMCRAID_SET_SUP_DEV_TIMEOUT,
4927 pmcraid_timeout_handler);
4928 return;
4929}
4930
4931/**
4932 * pmcraid_set_timestamp - set the timestamp to IOAFP
4933 *
4934 * @cmd: pointer to pmcraid_cmd structure
4935 *
4936 * Return Value
4937 * 0 for success or non-zero for failure cases
4938 */
4939static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd)
4940{
4941 struct pmcraid_instance *pinstance = cmd->drv_inst;
4942 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
4943 __be32 time_stamp_len = cpu_to_be32(PMCRAID_TIMESTAMP_LEN);
4944 struct pmcraid_ioadl_desc *ioadl;
4945 u64 timestamp;
4946
4947 timestamp = ktime_get_real_seconds() * 1000;
4948
4949 pinstance->timestamp_data->timestamp[0] = (__u8)(timestamp);
4950 pinstance->timestamp_data->timestamp[1] = (__u8)((timestamp) >> 8);
4951 pinstance->timestamp_data->timestamp[2] = (__u8)((timestamp) >> 16);
4952 pinstance->timestamp_data->timestamp[3] = (__u8)((timestamp) >> 24);
4953 pinstance->timestamp_data->timestamp[4] = (__u8)((timestamp) >> 32);
4954 pinstance->timestamp_data->timestamp[5] = (__u8)((timestamp) >> 40);
4955
4956 pmcraid_reinit_cmdblk(cmd);
4957 ioarcb->request_type = REQ_TYPE_SCSI;
4958 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
4959 ioarcb->cdb[0] = PMCRAID_SCSI_SET_TIMESTAMP;
4960 ioarcb->cdb[1] = PMCRAID_SCSI_SERVICE_ACTION;
4961 memcpy(&(ioarcb->cdb[6]), &time_stamp_len, sizeof(time_stamp_len));
4962
4963 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
4964 offsetof(struct pmcraid_ioarcb,
4965 add_data.u.ioadl[0]));
4966 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
4967 ioarcb->ioarcb_bus_addr &= cpu_to_le64(~(0x1FULL));
4968
4969 ioarcb->request_flags0 |= NO_LINK_DESCS;
4970 ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
4971 ioarcb->data_transfer_length =
4972 cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
4973 ioadl = &(ioarcb->add_data.u.ioadl[0]);
4974 ioadl->flags = IOADL_FLAGS_LAST_DESC;
4975 ioadl->address = cpu_to_le64(pinstance->timestamp_data_baddr);
4976 ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
4977
4978 if (!pinstance->timestamp_error) {
4979 pinstance->timestamp_error = 0;
4980 pmcraid_send_cmd(cmd, pmcraid_set_supported_devs,
4981 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
4982 } else {
4983 pmcraid_send_cmd(cmd, pmcraid_return_cmd,
4984 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
4985 return;
4986 }
4987}
4988
4989
4990/**
4991 * pmcraid_init_res_table - Initialize the resource table
4992 * @cmd: pointer to pmcraid command struct
4993 *
4994 * This function looks through the existing resource table, comparing
4995 * it with the config table. This function will take care of old/new
4996 * devices and schedule adding/removing them from the mid-layer
4997 * as appropriate.
4998 *
4999 * Return value
5000 * None
5001 */
5002static void pmcraid_init_res_table(struct pmcraid_cmd *cmd)
5003{
5004 struct pmcraid_instance *pinstance = cmd->drv_inst;
5005 struct pmcraid_resource_entry *res, *temp;
5006 struct pmcraid_config_table_entry *cfgte;
5007 unsigned long lock_flags;
5008 int found, rc, i;
5009 u16 fw_version;
5010 LIST_HEAD(old_res);
5011
5012 if (pinstance->cfg_table->flags & MICROCODE_UPDATE_REQUIRED)
5013 pmcraid_err("IOA requires microcode download\n");
5014
5015 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
5016
5017 /* resource list is protected by pinstance->resource_lock.
5018 * init_res_table can be called from probe (user-thread) or runtime
5019 * reset (timer/tasklet)
5020 */
5021 spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
5022
5023 list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue)
5024 list_move_tail(&res->queue, &old_res);
5025
5026 for (i = 0; i < le16_to_cpu(pinstance->cfg_table->num_entries); i++) {
5027 if (be16_to_cpu(pinstance->inq_data->fw_version) <=
5028 PMCRAID_FW_VERSION_1)
5029 cfgte = &pinstance->cfg_table->entries[i];
5030 else
5031 cfgte = (struct pmcraid_config_table_entry *)
5032 &pinstance->cfg_table->entries_ext[i];
5033
5034 if (!pmcraid_expose_resource(fw_version, cfgte))
5035 continue;
5036
5037 found = 0;
5038
5039 /* If this entry was already detected and initialized */
5040 list_for_each_entry_safe(res, temp, &old_res, queue) {
5041
5042 rc = memcmp(&res->cfg_entry.resource_address,
5043 &cfgte->resource_address,
5044 sizeof(cfgte->resource_address));
5045 if (!rc) {
5046 list_move_tail(&res->queue,
5047 &pinstance->used_res_q);
5048 found = 1;
5049 break;
5050 }
5051 }
5052
5053 /* If this is new entry, initialize it and add it the queue */
5054 if (!found) {
5055
5056 if (list_empty(&pinstance->free_res_q)) {
5057 pmcraid_err("Too many devices attached\n");
5058 break;
5059 }
5060
5061 found = 1;
5062 res = list_entry(pinstance->free_res_q.next,
5063 struct pmcraid_resource_entry, queue);
5064
5065 res->scsi_dev = NULL;
5066 res->change_detected = RES_CHANGE_ADD;
5067 res->reset_progress = 0;
5068 list_move_tail(&res->queue, &pinstance->used_res_q);
5069 }
5070
5071 /* copy new configuration table entry details into driver
5072 * maintained resource entry
5073 */
5074 if (found) {
5075 memcpy(&res->cfg_entry, cfgte,
5076 pinstance->config_table_entry_size);
5077 pmcraid_info("New res type:%x, vset:%x, addr:%x:\n",
5078 res->cfg_entry.resource_type,
5079 (fw_version <= PMCRAID_FW_VERSION_1 ?
5080 res->cfg_entry.unique_flags1 :
5081 le16_to_cpu(res->cfg_entry.array_id) & 0xFF),
5082 le32_to_cpu(res->cfg_entry.resource_address));
5083 }
5084 }
5085
5086 /* Detect any deleted entries, mark them for deletion from mid-layer */
5087 list_for_each_entry_safe(res, temp, &old_res, queue) {
5088
5089 if (res->scsi_dev) {
5090 res->change_detected = RES_CHANGE_DEL;
5091 res->cfg_entry.resource_handle =
5092 PMCRAID_INVALID_RES_HANDLE;
5093 list_move_tail(&res->queue, &pinstance->used_res_q);
5094 } else {
5095 list_move_tail(&res->queue, &pinstance->free_res_q);
5096 }
5097 }
5098
5099 /* release the resource list lock */
5100 spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
5101 pmcraid_set_timestamp(cmd);
5102}
5103
5104/**
5105 * pmcraid_querycfg - Send a Query IOA Config to the adapter.
5106 * @cmd: pointer pmcraid_cmd struct
5107 *
5108 * This function sends a Query IOA Configuration command to the adapter to
5109 * retrieve the IOA configuration table.
5110 *
5111 * Return value:
5112 * none
5113 */
5114static void pmcraid_querycfg(struct pmcraid_cmd *cmd)
5115{
5116 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5117 struct pmcraid_ioadl_desc *ioadl;
5118 struct pmcraid_instance *pinstance = cmd->drv_inst;
5119 __be32 cfg_table_size = cpu_to_be32(sizeof(struct pmcraid_config_table));
5120
5121 if (be16_to_cpu(pinstance->inq_data->fw_version) <=
5122 PMCRAID_FW_VERSION_1)
5123 pinstance->config_table_entry_size =
5124 sizeof(struct pmcraid_config_table_entry);
5125 else
5126 pinstance->config_table_entry_size =
5127 sizeof(struct pmcraid_config_table_entry_ext);
5128
5129 ioarcb->request_type = REQ_TYPE_IOACMD;
5130 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5131
5132 ioarcb->cdb[0] = PMCRAID_QUERY_IOA_CONFIG;
5133
5134 /* firmware requires 4-byte length field, specified in B.E format */
5135 memcpy(&(ioarcb->cdb[10]), &cfg_table_size, sizeof(cfg_table_size));
5136
5137 /* Since entire config table can be described by single IOADL, it can
5138 * be part of IOARCB itself
5139 */
5140 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
5141 offsetof(struct pmcraid_ioarcb,
5142 add_data.u.ioadl[0]));
5143 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
5144 ioarcb->ioarcb_bus_addr &= cpu_to_le64(~0x1FULL);
5145
5146 ioarcb->request_flags0 |= NO_LINK_DESCS;
5147 ioarcb->data_transfer_length =
5148 cpu_to_le32(sizeof(struct pmcraid_config_table));
5149
5150 ioadl = &(ioarcb->add_data.u.ioadl[0]);
5151 ioadl->flags = IOADL_FLAGS_LAST_DESC;
5152 ioadl->address = cpu_to_le64(pinstance->cfg_table_bus_addr);
5153 ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_config_table));
5154
5155 pmcraid_send_cmd(cmd, pmcraid_init_res_table,
5156 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5157}
5158
5159
5160/**
5161 * pmcraid_probe - PCI probe entry pointer for PMC MaxRAID controller driver
5162 * @pdev: pointer to pci device structure
5163 * @dev_id: pointer to device ids structure
5164 *
5165 * Return Value
5166 * returns 0 if the device is claimed and successfully configured.
5167 * returns non-zero error code in case of any failure
5168 */
5169static int pmcraid_probe(struct pci_dev *pdev,
5170 const struct pci_device_id *dev_id)
5171{
5172 struct pmcraid_instance *pinstance;
5173 struct Scsi_Host *host;
5174 void __iomem *mapped_pci_addr;
5175 int rc = PCIBIOS_SUCCESSFUL;
5176
5177 if (atomic_read(&pmcraid_adapter_count) >= PMCRAID_MAX_ADAPTERS) {
5178 pmcraid_err
5179 ("maximum number(%d) of supported adapters reached\n",
5180 atomic_read(&pmcraid_adapter_count));
5181 return -ENOMEM;
5182 }
5183
5184 atomic_inc(&pmcraid_adapter_count);
5185 rc = pci_enable_device(pdev);
5186
5187 if (rc) {
5188 dev_err(&pdev->dev, "Cannot enable adapter\n");
5189 atomic_dec(&pmcraid_adapter_count);
5190 return rc;
5191 }
5192
5193 dev_info(&pdev->dev,
5194 "Found new IOA(%x:%x), Total IOA count: %d\n",
5195 pdev->vendor, pdev->device,
5196 atomic_read(&pmcraid_adapter_count));
5197
5198 rc = pci_request_regions(pdev, PMCRAID_DRIVER_NAME);
5199
5200 if (rc < 0) {
5201 dev_err(&pdev->dev,
5202 "Couldn't register memory range of registers\n");
5203 goto out_disable_device;
5204 }
5205
5206 mapped_pci_addr = pci_iomap(pdev, 0, 0);
5207
5208 if (!mapped_pci_addr) {
5209 dev_err(&pdev->dev, "Couldn't map PCI registers memory\n");
5210 rc = -ENOMEM;
5211 goto out_release_regions;
5212 }
5213
5214 pci_set_master(pdev);
5215
5216 /* Firmware requires the system bus address of IOARCB to be within
5217 * 32-bit addressable range though it has 64-bit IOARRIN register.
5218 * However, firmware supports 64-bit streaming DMA buffers, whereas
5219 * coherent buffers are to be 32-bit. Since dma_alloc_coherent always
5220 * returns memory within 4GB (if not, change this logic), coherent
5221 * buffers are within firmware acceptable address ranges.
5222 */
5223 if (sizeof(dma_addr_t) == 4 ||
5224 dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)))
5225 rc = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
5226
5227 /* firmware expects 32-bit DMA addresses for IOARRIN register; set 32
5228 * bit mask for dma_alloc_coherent to return addresses within 4GB
5229 */
5230 if (rc == 0)
5231 rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
5232
5233 if (rc != 0) {
5234 dev_err(&pdev->dev, "Failed to set PCI DMA mask\n");
5235 goto cleanup_nomem;
5236 }
5237
5238 host = scsi_host_alloc(&pmcraid_host_template,
5239 sizeof(struct pmcraid_instance));
5240
5241 if (!host) {
5242 dev_err(&pdev->dev, "scsi_host_alloc failed!\n");
5243 rc = -ENOMEM;
5244 goto cleanup_nomem;
5245 }
5246
5247 host->max_id = PMCRAID_MAX_NUM_TARGETS_PER_BUS;
5248 host->max_lun = PMCRAID_MAX_NUM_LUNS_PER_TARGET;
5249 host->unique_id = host->host_no;
5250 host->max_channel = PMCRAID_MAX_BUS_TO_SCAN;
5251 host->max_cmd_len = PMCRAID_MAX_CDB_LEN;
5252
5253 /* zero out entire instance structure */
5254 pinstance = (struct pmcraid_instance *)host->hostdata;
5255 memset(pinstance, 0, sizeof(*pinstance));
5256
5257 pinstance->chip_cfg =
5258 (struct pmcraid_chip_details *)(dev_id->driver_data);
5259
5260 rc = pmcraid_init_instance(pdev, host, mapped_pci_addr);
5261
5262 if (rc < 0) {
5263 dev_err(&pdev->dev, "failed to initialize adapter instance\n");
5264 goto out_scsi_host_put;
5265 }
5266
5267 pci_set_drvdata(pdev, pinstance);
5268
5269 /* Save PCI config-space for use following the reset */
5270 rc = pci_save_state(pinstance->pdev);
5271
5272 if (rc != 0) {
5273 dev_err(&pdev->dev, "Failed to save PCI config space\n");
5274 goto out_scsi_host_put;
5275 }
5276
5277 pmcraid_disable_interrupts(pinstance, ~0);
5278
5279 rc = pmcraid_register_interrupt_handler(pinstance);
5280
5281 if (rc) {
5282 dev_err(&pdev->dev, "couldn't register interrupt handler\n");
5283 goto out_scsi_host_put;
5284 }
5285
5286 pmcraid_init_tasklets(pinstance);
5287
5288 /* allocate verious buffers used by LLD.*/
5289 rc = pmcraid_init_buffers(pinstance);
5290
5291 if (rc) {
5292 pmcraid_err("couldn't allocate memory blocks\n");
5293 goto out_unregister_isr;
5294 }
5295
5296 /* check the reset type required */
5297 pmcraid_reset_type(pinstance);
5298
5299 pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
5300
5301 /* Start IOA firmware initialization and bring card to Operational
5302 * state.
5303 */
5304 pmcraid_info("starting IOA initialization sequence\n");
5305 if (pmcraid_reset_bringup(pinstance)) {
5306 dev_err(&pdev->dev, "couldn't initialize IOA\n");
5307 rc = 1;
5308 goto out_release_bufs;
5309 }
5310
5311 /* Add adapter instance into mid-layer list */
5312 rc = scsi_add_host(pinstance->host, &pdev->dev);
5313 if (rc != 0) {
5314 pmcraid_err("couldn't add host into mid-layer: %d\n", rc);
5315 goto out_release_bufs;
5316 }
5317
5318 scsi_scan_host(pinstance->host);
5319
5320 rc = pmcraid_setup_chrdev(pinstance);
5321
5322 if (rc != 0) {
5323 pmcraid_err("couldn't create mgmt interface, error: %x\n",
5324 rc);
5325 goto out_remove_host;
5326 }
5327
5328 /* Schedule worker thread to handle CCN and take care of adding and
5329 * removing devices to OS
5330 */
5331 atomic_set(&pinstance->expose_resources, 1);
5332 schedule_work(&pinstance->worker_q);
5333 return rc;
5334
5335out_remove_host:
5336 scsi_remove_host(host);
5337
5338out_release_bufs:
5339 pmcraid_release_buffers(pinstance);
5340
5341out_unregister_isr:
5342 pmcraid_kill_tasklets(pinstance);
5343 pmcraid_unregister_interrupt_handler(pinstance);
5344
5345out_scsi_host_put:
5346 scsi_host_put(host);
5347
5348cleanup_nomem:
5349 iounmap(mapped_pci_addr);
5350
5351out_release_regions:
5352 pci_release_regions(pdev);
5353
5354out_disable_device:
5355 atomic_dec(&pmcraid_adapter_count);
5356 pci_disable_device(pdev);
5357 return -ENODEV;
5358}
5359
5360static SIMPLE_DEV_PM_OPS(pmcraid_pm_ops, pmcraid_suspend, pmcraid_resume);
5361
5362/*
5363 * PCI driver structure of pmcraid driver
5364 */
5365static struct pci_driver pmcraid_driver = {
5366 .name = PMCRAID_DRIVER_NAME,
5367 .id_table = pmcraid_pci_table,
5368 .probe = pmcraid_probe,
5369 .remove = pmcraid_remove,
5370 .driver.pm = &pmcraid_pm_ops,
5371 .shutdown = pmcraid_shutdown
5372};
5373
5374/**
5375 * pmcraid_init - module load entry point
5376 */
5377static int __init pmcraid_init(void)
5378{
5379 dev_t dev;
5380 int error;
5381
5382 pmcraid_info("%s Device Driver version: %s\n",
5383 PMCRAID_DRIVER_NAME, PMCRAID_DRIVER_VERSION);
5384
5385 error = alloc_chrdev_region(&dev, 0,
5386 PMCRAID_MAX_ADAPTERS,
5387 PMCRAID_DEVFILE);
5388
5389 if (error) {
5390 pmcraid_err("failed to get a major number for adapters\n");
5391 goto out_init;
5392 }
5393
5394 pmcraid_major = MAJOR(dev);
5395
5396 error = class_register(&pmcraid_class);
5397
5398 if (error) {
5399 pmcraid_err("failed to register with sysfs, error = %x\n",
5400 error);
5401 goto out_unreg_chrdev;
5402 }
5403
5404 error = pmcraid_netlink_init();
5405
5406 if (error) {
5407 class_unregister(&pmcraid_class);
5408 goto out_unreg_chrdev;
5409 }
5410
5411 error = pci_register_driver(&pmcraid_driver);
5412
5413 if (error == 0)
5414 goto out_init;
5415
5416 pmcraid_err("failed to register pmcraid driver, error = %x\n",
5417 error);
5418 class_unregister(&pmcraid_class);
5419 pmcraid_netlink_release();
5420
5421out_unreg_chrdev:
5422 unregister_chrdev_region(MKDEV(pmcraid_major, 0), PMCRAID_MAX_ADAPTERS);
5423
5424out_init:
5425 return error;
5426}
5427
5428/**
5429 * pmcraid_exit - module unload entry point
5430 */
5431static void __exit pmcraid_exit(void)
5432{
5433 pmcraid_netlink_release();
5434 unregister_chrdev_region(MKDEV(pmcraid_major, 0),
5435 PMCRAID_MAX_ADAPTERS);
5436 pci_unregister_driver(&pmcraid_driver);
5437 class_unregister(&pmcraid_class);
5438}
5439
5440module_init(pmcraid_init);
5441module_exit(pmcraid_exit);
1/*
2 * pmcraid.c -- driver for PMC Sierra MaxRAID controller adapters
3 *
4 * Written By: Anil Ravindranath<anil_ravindranath@pmc-sierra.com>
5 * PMC-Sierra Inc
6 *
7 * Copyright (C) 2008, 2009 PMC Sierra Inc
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307,
22 * USA
23 *
24 */
25#include <linux/fs.h>
26#include <linux/init.h>
27#include <linux/types.h>
28#include <linux/errno.h>
29#include <linux/kernel.h>
30#include <linux/ioport.h>
31#include <linux/delay.h>
32#include <linux/pci.h>
33#include <linux/wait.h>
34#include <linux/spinlock.h>
35#include <linux/sched.h>
36#include <linux/interrupt.h>
37#include <linux/blkdev.h>
38#include <linux/firmware.h>
39#include <linux/module.h>
40#include <linux/moduleparam.h>
41#include <linux/hdreg.h>
42#include <linux/io.h>
43#include <linux/slab.h>
44#include <asm/irq.h>
45#include <asm/processor.h>
46#include <linux/libata.h>
47#include <linux/mutex.h>
48#include <scsi/scsi.h>
49#include <scsi/scsi_host.h>
50#include <scsi/scsi_device.h>
51#include <scsi/scsi_tcq.h>
52#include <scsi/scsi_eh.h>
53#include <scsi/scsi_cmnd.h>
54#include <scsi/scsicam.h>
55
56#include "pmcraid.h"
57
58/*
59 * Module configuration parameters
60 */
61static unsigned int pmcraid_debug_log;
62static unsigned int pmcraid_disable_aen;
63static unsigned int pmcraid_log_level = IOASC_LOG_LEVEL_MUST;
64static unsigned int pmcraid_enable_msix;
65
66/*
67 * Data structures to support multiple adapters by the LLD.
68 * pmcraid_adapter_count - count of configured adapters
69 */
70static atomic_t pmcraid_adapter_count = ATOMIC_INIT(0);
71
72/*
73 * Supporting user-level control interface through IOCTL commands.
74 * pmcraid_major - major number to use
75 * pmcraid_minor - minor number(s) to use
76 */
77static unsigned int pmcraid_major;
78static struct class *pmcraid_class;
79DECLARE_BITMAP(pmcraid_minor, PMCRAID_MAX_ADAPTERS);
80
81/*
82 * Module parameters
83 */
84MODULE_AUTHOR("Anil Ravindranath<anil_ravindranath@pmc-sierra.com>");
85MODULE_DESCRIPTION("PMC Sierra MaxRAID Controller Driver");
86MODULE_LICENSE("GPL");
87MODULE_VERSION(PMCRAID_DRIVER_VERSION);
88
89module_param_named(log_level, pmcraid_log_level, uint, (S_IRUGO | S_IWUSR));
90MODULE_PARM_DESC(log_level,
91 "Enables firmware error code logging, default :1 high-severity"
92 " errors, 2: all errors including high-severity errors,"
93 " 0: disables logging");
94
95module_param_named(debug, pmcraid_debug_log, uint, (S_IRUGO | S_IWUSR));
96MODULE_PARM_DESC(debug,
97 "Enable driver verbose message logging. Set 1 to enable."
98 "(default: 0)");
99
100module_param_named(disable_aen, pmcraid_disable_aen, uint, (S_IRUGO | S_IWUSR));
101MODULE_PARM_DESC(disable_aen,
102 "Disable driver aen notifications to apps. Set 1 to disable."
103 "(default: 0)");
104
105/* chip specific constants for PMC MaxRAID controllers (same for
106 * 0x5220 and 0x8010
107 */
108static struct pmcraid_chip_details pmcraid_chip_cfg[] = {
109 {
110 .ioastatus = 0x0,
111 .ioarrin = 0x00040,
112 .mailbox = 0x7FC30,
113 .global_intr_mask = 0x00034,
114 .ioa_host_intr = 0x0009C,
115 .ioa_host_intr_clr = 0x000A0,
116 .ioa_host_msix_intr = 0x7FC40,
117 .ioa_host_mask = 0x7FC28,
118 .ioa_host_mask_clr = 0x7FC28,
119 .host_ioa_intr = 0x00020,
120 .host_ioa_intr_clr = 0x00020,
121 .transop_timeout = 300
122 }
123};
124
125/*
126 * PCI device ids supported by pmcraid driver
127 */
128static struct pci_device_id pmcraid_pci_table[] __devinitdata = {
129 { PCI_DEVICE(PCI_VENDOR_ID_PMC, PCI_DEVICE_ID_PMC_MAXRAID),
130 0, 0, (kernel_ulong_t)&pmcraid_chip_cfg[0]
131 },
132 {}
133};
134
135MODULE_DEVICE_TABLE(pci, pmcraid_pci_table);
136
137
138
139/**
140 * pmcraid_slave_alloc - Prepare for commands to a device
141 * @scsi_dev: scsi device struct
142 *
143 * This function is called by mid-layer prior to sending any command to the new
144 * device. Stores resource entry details of the device in scsi_device struct.
145 * Queuecommand uses the resource handle and other details to fill up IOARCB
146 * while sending commands to the device.
147 *
148 * Return value:
149 * 0 on success / -ENXIO if device does not exist
150 */
151static int pmcraid_slave_alloc(struct scsi_device *scsi_dev)
152{
153 struct pmcraid_resource_entry *temp, *res = NULL;
154 struct pmcraid_instance *pinstance;
155 u8 target, bus, lun;
156 unsigned long lock_flags;
157 int rc = -ENXIO;
158 u16 fw_version;
159
160 pinstance = shost_priv(scsi_dev->host);
161
162 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
163
164 /* Driver exposes VSET and GSCSI resources only; all other device types
165 * are not exposed. Resource list is synchronized using resource lock
166 * so any traversal or modifications to the list should be done inside
167 * this lock
168 */
169 spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
170 list_for_each_entry(temp, &pinstance->used_res_q, queue) {
171
172 /* do not expose VSETs with order-ids > MAX_VSET_TARGETS */
173 if (RES_IS_VSET(temp->cfg_entry)) {
174 if (fw_version <= PMCRAID_FW_VERSION_1)
175 target = temp->cfg_entry.unique_flags1;
176 else
177 target = temp->cfg_entry.array_id & 0xFF;
178
179 if (target > PMCRAID_MAX_VSET_TARGETS)
180 continue;
181 bus = PMCRAID_VSET_BUS_ID;
182 lun = 0;
183 } else if (RES_IS_GSCSI(temp->cfg_entry)) {
184 target = RES_TARGET(temp->cfg_entry.resource_address);
185 bus = PMCRAID_PHYS_BUS_ID;
186 lun = RES_LUN(temp->cfg_entry.resource_address);
187 } else {
188 continue;
189 }
190
191 if (bus == scsi_dev->channel &&
192 target == scsi_dev->id &&
193 lun == scsi_dev->lun) {
194 res = temp;
195 break;
196 }
197 }
198
199 if (res) {
200 res->scsi_dev = scsi_dev;
201 scsi_dev->hostdata = res;
202 res->change_detected = 0;
203 atomic_set(&res->read_failures, 0);
204 atomic_set(&res->write_failures, 0);
205 rc = 0;
206 }
207 spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
208 return rc;
209}
210
211/**
212 * pmcraid_slave_configure - Configures a SCSI device
213 * @scsi_dev: scsi device struct
214 *
215 * This function is executed by SCSI mid layer just after a device is first
216 * scanned (i.e. it has responded to an INQUIRY). For VSET resources, the
217 * timeout value (default 30s) will be over-written to a higher value (60s)
218 * and max_sectors value will be over-written to 512. It also sets queue depth
219 * to host->cmd_per_lun value
220 *
221 * Return value:
222 * 0 on success
223 */
224static int pmcraid_slave_configure(struct scsi_device *scsi_dev)
225{
226 struct pmcraid_resource_entry *res = scsi_dev->hostdata;
227
228 if (!res)
229 return 0;
230
231 /* LLD exposes VSETs and Enclosure devices only */
232 if (RES_IS_GSCSI(res->cfg_entry) &&
233 scsi_dev->type != TYPE_ENCLOSURE)
234 return -ENXIO;
235
236 pmcraid_info("configuring %x:%x:%x:%x\n",
237 scsi_dev->host->unique_id,
238 scsi_dev->channel,
239 scsi_dev->id,
240 scsi_dev->lun);
241
242 if (RES_IS_GSCSI(res->cfg_entry)) {
243 scsi_dev->allow_restart = 1;
244 } else if (RES_IS_VSET(res->cfg_entry)) {
245 scsi_dev->allow_restart = 1;
246 blk_queue_rq_timeout(scsi_dev->request_queue,
247 PMCRAID_VSET_IO_TIMEOUT);
248 blk_queue_max_hw_sectors(scsi_dev->request_queue,
249 PMCRAID_VSET_MAX_SECTORS);
250 }
251
252 if (scsi_dev->tagged_supported &&
253 (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry))) {
254 scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
255 scsi_adjust_queue_depth(scsi_dev, MSG_SIMPLE_TAG,
256 scsi_dev->host->cmd_per_lun);
257 } else {
258 scsi_adjust_queue_depth(scsi_dev, 0,
259 scsi_dev->host->cmd_per_lun);
260 }
261
262 return 0;
263}
264
265/**
266 * pmcraid_slave_destroy - Unconfigure a SCSI device before removing it
267 *
268 * @scsi_dev: scsi device struct
269 *
270 * This is called by mid-layer before removing a device. Pointer assignments
271 * done in pmcraid_slave_alloc will be reset to NULL here.
272 *
273 * Return value
274 * none
275 */
276static void pmcraid_slave_destroy(struct scsi_device *scsi_dev)
277{
278 struct pmcraid_resource_entry *res;
279
280 res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;
281
282 if (res)
283 res->scsi_dev = NULL;
284
285 scsi_dev->hostdata = NULL;
286}
287
288/**
289 * pmcraid_change_queue_depth - Change the device's queue depth
290 * @scsi_dev: scsi device struct
291 * @depth: depth to set
292 * @reason: calling context
293 *
294 * Return value
295 * actual depth set
296 */
297static int pmcraid_change_queue_depth(struct scsi_device *scsi_dev, int depth,
298 int reason)
299{
300 if (reason != SCSI_QDEPTH_DEFAULT)
301 return -EOPNOTSUPP;
302
303 if (depth > PMCRAID_MAX_CMD_PER_LUN)
304 depth = PMCRAID_MAX_CMD_PER_LUN;
305
306 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev), depth);
307
308 return scsi_dev->queue_depth;
309}
310
311/**
312 * pmcraid_change_queue_type - Change the device's queue type
313 * @scsi_dev: scsi device struct
314 * @tag: type of tags to use
315 *
316 * Return value:
317 * actual queue type set
318 */
319static int pmcraid_change_queue_type(struct scsi_device *scsi_dev, int tag)
320{
321 struct pmcraid_resource_entry *res;
322
323 res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;
324
325 if ((res) && scsi_dev->tagged_supported &&
326 (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry))) {
327 scsi_set_tag_type(scsi_dev, tag);
328
329 if (tag)
330 scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
331 else
332 scsi_deactivate_tcq(scsi_dev, scsi_dev->queue_depth);
333 } else
334 tag = 0;
335
336 return tag;
337}
338
339
340/**
341 * pmcraid_init_cmdblk - initializes a command block
342 *
343 * @cmd: pointer to struct pmcraid_cmd to be initialized
344 * @index: if >=0 first time initialization; otherwise reinitialization
345 *
346 * Return Value
347 * None
348 */
349void pmcraid_init_cmdblk(struct pmcraid_cmd *cmd, int index)
350{
351 struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
352 dma_addr_t dma_addr = cmd->ioa_cb_bus_addr;
353
354 if (index >= 0) {
355 /* first time initialization (called from probe) */
356 u32 ioasa_offset =
357 offsetof(struct pmcraid_control_block, ioasa);
358
359 cmd->index = index;
360 ioarcb->response_handle = cpu_to_le32(index << 2);
361 ioarcb->ioarcb_bus_addr = cpu_to_le64(dma_addr);
362 ioarcb->ioasa_bus_addr = cpu_to_le64(dma_addr + ioasa_offset);
363 ioarcb->ioasa_len = cpu_to_le16(sizeof(struct pmcraid_ioasa));
364 } else {
365 /* re-initialization of various lengths, called once command is
366 * processed by IOA
367 */
368 memset(&cmd->ioa_cb->ioarcb.cdb, 0, PMCRAID_MAX_CDB_LEN);
369 ioarcb->hrrq_id = 0;
370 ioarcb->request_flags0 = 0;
371 ioarcb->request_flags1 = 0;
372 ioarcb->cmd_timeout = 0;
373 ioarcb->ioarcb_bus_addr &= (~0x1FULL);
374 ioarcb->ioadl_bus_addr = 0;
375 ioarcb->ioadl_length = 0;
376 ioarcb->data_transfer_length = 0;
377 ioarcb->add_cmd_param_length = 0;
378 ioarcb->add_cmd_param_offset = 0;
379 cmd->ioa_cb->ioasa.ioasc = 0;
380 cmd->ioa_cb->ioasa.residual_data_length = 0;
381 cmd->time_left = 0;
382 }
383
384 cmd->cmd_done = NULL;
385 cmd->scsi_cmd = NULL;
386 cmd->release = 0;
387 cmd->completion_req = 0;
388 cmd->sense_buffer = 0;
389 cmd->sense_buffer_dma = 0;
390 cmd->dma_handle = 0;
391 init_timer(&cmd->timer);
392}
393
394/**
395 * pmcraid_reinit_cmdblk - reinitialize a command block
396 *
397 * @cmd: pointer to struct pmcraid_cmd to be reinitialized
398 *
399 * Return Value
400 * None
401 */
402static void pmcraid_reinit_cmdblk(struct pmcraid_cmd *cmd)
403{
404 pmcraid_init_cmdblk(cmd, -1);
405}
406
407/**
408 * pmcraid_get_free_cmd - get a free cmd block from command block pool
409 * @pinstance: adapter instance structure
410 *
411 * Return Value:
412 * returns pointer to cmd block or NULL if no blocks are available
413 */
414static struct pmcraid_cmd *pmcraid_get_free_cmd(
415 struct pmcraid_instance *pinstance
416)
417{
418 struct pmcraid_cmd *cmd = NULL;
419 unsigned long lock_flags;
420
421 /* free cmd block list is protected by free_pool_lock */
422 spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
423
424 if (!list_empty(&pinstance->free_cmd_pool)) {
425 cmd = list_entry(pinstance->free_cmd_pool.next,
426 struct pmcraid_cmd, free_list);
427 list_del(&cmd->free_list);
428 }
429 spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
430
431 /* Initialize the command block before giving it the caller */
432 if (cmd != NULL)
433 pmcraid_reinit_cmdblk(cmd);
434 return cmd;
435}
436
437/**
438 * pmcraid_return_cmd - return a completed command block back into free pool
439 * @cmd: pointer to the command block
440 *
441 * Return Value:
442 * nothing
443 */
444void pmcraid_return_cmd(struct pmcraid_cmd *cmd)
445{
446 struct pmcraid_instance *pinstance = cmd->drv_inst;
447 unsigned long lock_flags;
448
449 spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
450 list_add_tail(&cmd->free_list, &pinstance->free_cmd_pool);
451 spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
452}
453
454/**
455 * pmcraid_read_interrupts - reads IOA interrupts
456 *
457 * @pinstance: pointer to adapter instance structure
458 *
459 * Return value
460 * interrupts read from IOA
461 */
462static u32 pmcraid_read_interrupts(struct pmcraid_instance *pinstance)
463{
464 return (pinstance->interrupt_mode) ?
465 ioread32(pinstance->int_regs.ioa_host_msix_interrupt_reg) :
466 ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
467}
468
469/**
470 * pmcraid_disable_interrupts - Masks and clears all specified interrupts
471 *
472 * @pinstance: pointer to per adapter instance structure
473 * @intrs: interrupts to disable
474 *
475 * Return Value
476 * None
477 */
478static void pmcraid_disable_interrupts(
479 struct pmcraid_instance *pinstance,
480 u32 intrs
481)
482{
483 u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
484 u32 nmask = gmask | GLOBAL_INTERRUPT_MASK;
485
486 iowrite32(intrs, pinstance->int_regs.ioa_host_interrupt_clr_reg);
487 iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
488 ioread32(pinstance->int_regs.global_interrupt_mask_reg);
489
490 if (!pinstance->interrupt_mode) {
491 iowrite32(intrs,
492 pinstance->int_regs.ioa_host_interrupt_mask_reg);
493 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
494 }
495}
496
497/**
498 * pmcraid_enable_interrupts - Enables specified interrupts
499 *
500 * @pinstance: pointer to per adapter instance structure
501 * @intr: interrupts to enable
502 *
503 * Return Value
504 * None
505 */
506static void pmcraid_enable_interrupts(
507 struct pmcraid_instance *pinstance,
508 u32 intrs
509)
510{
511 u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
512 u32 nmask = gmask & (~GLOBAL_INTERRUPT_MASK);
513
514 iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
515
516 if (!pinstance->interrupt_mode) {
517 iowrite32(~intrs,
518 pinstance->int_regs.ioa_host_interrupt_mask_reg);
519 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
520 }
521
522 pmcraid_info("enabled interrupts global mask = %x intr_mask = %x\n",
523 ioread32(pinstance->int_regs.global_interrupt_mask_reg),
524 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg));
525}
526
527/**
528 * pmcraid_clr_trans_op - clear trans to op interrupt
529 *
530 * @pinstance: pointer to per adapter instance structure
531 *
532 * Return Value
533 * None
534 */
535static void pmcraid_clr_trans_op(
536 struct pmcraid_instance *pinstance
537)
538{
539 unsigned long lock_flags;
540
541 if (!pinstance->interrupt_mode) {
542 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
543 pinstance->int_regs.ioa_host_interrupt_mask_reg);
544 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
545 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
546 pinstance->int_regs.ioa_host_interrupt_clr_reg);
547 ioread32(pinstance->int_regs.ioa_host_interrupt_clr_reg);
548 }
549
550 if (pinstance->reset_cmd != NULL) {
551 del_timer(&pinstance->reset_cmd->timer);
552 spin_lock_irqsave(
553 pinstance->host->host_lock, lock_flags);
554 pinstance->reset_cmd->cmd_done(pinstance->reset_cmd);
555 spin_unlock_irqrestore(
556 pinstance->host->host_lock, lock_flags);
557 }
558}
559
560/**
561 * pmcraid_reset_type - Determine the required reset type
562 * @pinstance: pointer to adapter instance structure
563 *
564 * IOA requires hard reset if any of the following conditions is true.
565 * 1. If HRRQ valid interrupt is not masked
566 * 2. IOA reset alert doorbell is set
567 * 3. If there are any error interrupts
568 */
569static void pmcraid_reset_type(struct pmcraid_instance *pinstance)
570{
571 u32 mask;
572 u32 intrs;
573 u32 alerts;
574
575 mask = ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
576 intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
577 alerts = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
578
579 if ((mask & INTRS_HRRQ_VALID) == 0 ||
580 (alerts & DOORBELL_IOA_RESET_ALERT) ||
581 (intrs & PMCRAID_ERROR_INTERRUPTS)) {
582 pmcraid_info("IOA requires hard reset\n");
583 pinstance->ioa_hard_reset = 1;
584 }
585
586 /* If unit check is active, trigger the dump */
587 if (intrs & INTRS_IOA_UNIT_CHECK)
588 pinstance->ioa_unit_check = 1;
589}
590
591/**
592 * pmcraid_bist_done - completion function for PCI BIST
593 * @cmd: pointer to reset command
594 * Return Value
595 * none
596 */
597
598static void pmcraid_ioa_reset(struct pmcraid_cmd *);
599
600static void pmcraid_bist_done(struct pmcraid_cmd *cmd)
601{
602 struct pmcraid_instance *pinstance = cmd->drv_inst;
603 unsigned long lock_flags;
604 int rc;
605 u16 pci_reg;
606
607 rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
608
609 /* If PCI config space can't be accessed wait for another two secs */
610 if ((rc != PCIBIOS_SUCCESSFUL || (!(pci_reg & PCI_COMMAND_MEMORY))) &&
611 cmd->time_left > 0) {
612 pmcraid_info("BIST not complete, waiting another 2 secs\n");
613 cmd->timer.expires = jiffies + cmd->time_left;
614 cmd->time_left = 0;
615 cmd->timer.data = (unsigned long)cmd;
616 cmd->timer.function =
617 (void (*)(unsigned long))pmcraid_bist_done;
618 add_timer(&cmd->timer);
619 } else {
620 cmd->time_left = 0;
621 pmcraid_info("BIST is complete, proceeding with reset\n");
622 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
623 pmcraid_ioa_reset(cmd);
624 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
625 }
626}
627
628/**
629 * pmcraid_start_bist - starts BIST
630 * @cmd: pointer to reset cmd
631 * Return Value
632 * none
633 */
634static void pmcraid_start_bist(struct pmcraid_cmd *cmd)
635{
636 struct pmcraid_instance *pinstance = cmd->drv_inst;
637 u32 doorbells, intrs;
638
639 /* proceed with bist and wait for 2 seconds */
640 iowrite32(DOORBELL_IOA_START_BIST,
641 pinstance->int_regs.host_ioa_interrupt_reg);
642 doorbells = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
643 intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
644 pmcraid_info("doorbells after start bist: %x intrs: %x\n",
645 doorbells, intrs);
646
647 cmd->time_left = msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
648 cmd->timer.data = (unsigned long)cmd;
649 cmd->timer.expires = jiffies + msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
650 cmd->timer.function = (void (*)(unsigned long))pmcraid_bist_done;
651 add_timer(&cmd->timer);
652}
653
654/**
655 * pmcraid_reset_alert_done - completion routine for reset_alert
656 * @cmd: pointer to command block used in reset sequence
657 * Return value
658 * None
659 */
660static void pmcraid_reset_alert_done(struct pmcraid_cmd *cmd)
661{
662 struct pmcraid_instance *pinstance = cmd->drv_inst;
663 u32 status = ioread32(pinstance->ioa_status);
664 unsigned long lock_flags;
665
666 /* if the critical operation in progress bit is set or the wait times
667 * out, invoke reset engine to proceed with hard reset. If there is
668 * some more time to wait, restart the timer
669 */
670 if (((status & INTRS_CRITICAL_OP_IN_PROGRESS) == 0) ||
671 cmd->time_left <= 0) {
672 pmcraid_info("critical op is reset proceeding with reset\n");
673 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
674 pmcraid_ioa_reset(cmd);
675 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
676 } else {
677 pmcraid_info("critical op is not yet reset waiting again\n");
678 /* restart timer if some more time is available to wait */
679 cmd->time_left -= PMCRAID_CHECK_FOR_RESET_TIMEOUT;
680 cmd->timer.data = (unsigned long)cmd;
681 cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
682 cmd->timer.function =
683 (void (*)(unsigned long))pmcraid_reset_alert_done;
684 add_timer(&cmd->timer);
685 }
686}
687
688/**
689 * pmcraid_reset_alert - alerts IOA for a possible reset
690 * @cmd : command block to be used for reset sequence.
691 *
692 * Return Value
693 * returns 0 if pci config-space is accessible and RESET_DOORBELL is
694 * successfully written to IOA. Returns non-zero in case pci_config_space
695 * is not accessible
696 */
697static void pmcraid_notify_ioastate(struct pmcraid_instance *, u32);
698static void pmcraid_reset_alert(struct pmcraid_cmd *cmd)
699{
700 struct pmcraid_instance *pinstance = cmd->drv_inst;
701 u32 doorbells;
702 int rc;
703 u16 pci_reg;
704
705 /* If we are able to access IOA PCI config space, alert IOA that we are
706 * going to reset it soon. This enables IOA to preserv persistent error
707 * data if any. In case memory space is not accessible, proceed with
708 * BIST or slot_reset
709 */
710 rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
711 if ((rc == PCIBIOS_SUCCESSFUL) && (pci_reg & PCI_COMMAND_MEMORY)) {
712
713 /* wait for IOA permission i.e until CRITICAL_OPERATION bit is
714 * reset IOA doesn't generate any interrupts when CRITICAL
715 * OPERATION bit is reset. A timer is started to wait for this
716 * bit to be reset.
717 */
718 cmd->time_left = PMCRAID_RESET_TIMEOUT;
719 cmd->timer.data = (unsigned long)cmd;
720 cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
721 cmd->timer.function =
722 (void (*)(unsigned long))pmcraid_reset_alert_done;
723 add_timer(&cmd->timer);
724
725 iowrite32(DOORBELL_IOA_RESET_ALERT,
726 pinstance->int_regs.host_ioa_interrupt_reg);
727 doorbells =
728 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
729 pmcraid_info("doorbells after reset alert: %x\n", doorbells);
730 } else {
731 pmcraid_info("PCI config is not accessible starting BIST\n");
732 pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
733 pmcraid_start_bist(cmd);
734 }
735}
736
737/**
738 * pmcraid_timeout_handler - Timeout handler for internally generated ops
739 *
740 * @cmd : pointer to command structure, that got timedout
741 *
742 * This function blocks host requests and initiates an adapter reset.
743 *
744 * Return value:
745 * None
746 */
747static void pmcraid_timeout_handler(struct pmcraid_cmd *cmd)
748{
749 struct pmcraid_instance *pinstance = cmd->drv_inst;
750 unsigned long lock_flags;
751
752 dev_info(&pinstance->pdev->dev,
753 "Adapter being reset due to cmd(CDB[0] = %x) timeout\n",
754 cmd->ioa_cb->ioarcb.cdb[0]);
755
756 /* Command timeouts result in hard reset sequence. The command that got
757 * timed out may be the one used as part of reset sequence. In this
758 * case restart reset sequence using the same command block even if
759 * reset is in progress. Otherwise fail this command and get a free
760 * command block to restart the reset sequence.
761 */
762 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
763 if (!pinstance->ioa_reset_in_progress) {
764 pinstance->ioa_reset_attempts = 0;
765 cmd = pmcraid_get_free_cmd(pinstance);
766
767 /* If we are out of command blocks, just return here itself.
768 * Some other command's timeout handler can do the reset job
769 */
770 if (cmd == NULL) {
771 spin_unlock_irqrestore(pinstance->host->host_lock,
772 lock_flags);
773 pmcraid_err("no free cmnd block for timeout handler\n");
774 return;
775 }
776
777 pinstance->reset_cmd = cmd;
778 pinstance->ioa_reset_in_progress = 1;
779 } else {
780 pmcraid_info("reset is already in progress\n");
781
782 if (pinstance->reset_cmd != cmd) {
783 /* This command should have been given to IOA, this
784 * command will be completed by fail_outstanding_cmds
785 * anyway
786 */
787 pmcraid_err("cmd is pending but reset in progress\n");
788 }
789
790 /* If this command was being used as part of the reset
791 * sequence, set cmd_done pointer to pmcraid_ioa_reset. This
792 * causes fail_outstanding_commands not to return the command
793 * block back to free pool
794 */
795 if (cmd == pinstance->reset_cmd)
796 cmd->cmd_done = pmcraid_ioa_reset;
797 }
798
799 /* Notify apps of important IOA bringup/bringdown sequences */
800 if (pinstance->scn.ioa_state != PMC_DEVICE_EVENT_RESET_START &&
801 pinstance->scn.ioa_state != PMC_DEVICE_EVENT_SHUTDOWN_START)
802 pmcraid_notify_ioastate(pinstance,
803 PMC_DEVICE_EVENT_RESET_START);
804
805 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
806 scsi_block_requests(pinstance->host);
807 pmcraid_reset_alert(cmd);
808 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
809}
810
811/**
812 * pmcraid_internal_done - completion routine for internally generated cmds
813 *
814 * @cmd: command that got response from IOA
815 *
816 * Return Value:
817 * none
818 */
819static void pmcraid_internal_done(struct pmcraid_cmd *cmd)
820{
821 pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
822 cmd->ioa_cb->ioarcb.cdb[0],
823 le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
824
825 /* Some of the internal commands are sent with callers blocking for the
826 * response. Same will be indicated as part of cmd->completion_req
827 * field. Response path needs to wake up any waiters waiting for cmd
828 * completion if this flag is set.
829 */
830 if (cmd->completion_req) {
831 cmd->completion_req = 0;
832 complete(&cmd->wait_for_completion);
833 }
834
835 /* most of the internal commands are completed by caller itself, so
836 * no need to return the command block back to free pool until we are
837 * required to do so (e.g once done with initialization).
838 */
839 if (cmd->release) {
840 cmd->release = 0;
841 pmcraid_return_cmd(cmd);
842 }
843}
844
845/**
846 * pmcraid_reinit_cfgtable_done - done function for cfg table reinitialization
847 *
848 * @cmd: command that got response from IOA
849 *
850 * This routine is called after driver re-reads configuration table due to a
851 * lost CCN. It returns the command block back to free pool and schedules
852 * worker thread to add/delete devices into the system.
853 *
854 * Return Value:
855 * none
856 */
857static void pmcraid_reinit_cfgtable_done(struct pmcraid_cmd *cmd)
858{
859 pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
860 cmd->ioa_cb->ioarcb.cdb[0],
861 le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
862
863 if (cmd->release) {
864 cmd->release = 0;
865 pmcraid_return_cmd(cmd);
866 }
867 pmcraid_info("scheduling worker for config table reinitialization\n");
868 schedule_work(&cmd->drv_inst->worker_q);
869}
870
871/**
872 * pmcraid_erp_done - Process completion of SCSI error response from device
873 * @cmd: pmcraid_command
874 *
875 * This function copies the sense buffer into the scsi_cmd struct and completes
876 * scsi_cmd by calling scsi_done function.
877 *
878 * Return value:
879 * none
880 */
881static void pmcraid_erp_done(struct pmcraid_cmd *cmd)
882{
883 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
884 struct pmcraid_instance *pinstance = cmd->drv_inst;
885 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
886
887 if (PMCRAID_IOASC_SENSE_KEY(ioasc) > 0) {
888 scsi_cmd->result |= (DID_ERROR << 16);
889 scmd_printk(KERN_INFO, scsi_cmd,
890 "command CDB[0] = %x failed with IOASC: 0x%08X\n",
891 cmd->ioa_cb->ioarcb.cdb[0], ioasc);
892 }
893
894 /* if we had allocated sense buffers for request sense, copy the sense
895 * release the buffers
896 */
897 if (cmd->sense_buffer != NULL) {
898 memcpy(scsi_cmd->sense_buffer,
899 cmd->sense_buffer,
900 SCSI_SENSE_BUFFERSIZE);
901 pci_free_consistent(pinstance->pdev,
902 SCSI_SENSE_BUFFERSIZE,
903 cmd->sense_buffer, cmd->sense_buffer_dma);
904 cmd->sense_buffer = NULL;
905 cmd->sense_buffer_dma = 0;
906 }
907
908 scsi_dma_unmap(scsi_cmd);
909 pmcraid_return_cmd(cmd);
910 scsi_cmd->scsi_done(scsi_cmd);
911}
912
913/**
914 * pmcraid_fire_command - sends an IOA command to adapter
915 *
916 * This function adds the given block into pending command list
917 * and returns without waiting
918 *
919 * @cmd : command to be sent to the device
920 *
921 * Return Value
922 * None
923 */
924static void _pmcraid_fire_command(struct pmcraid_cmd *cmd)
925{
926 struct pmcraid_instance *pinstance = cmd->drv_inst;
927 unsigned long lock_flags;
928
929 /* Add this command block to pending cmd pool. We do this prior to
930 * writting IOARCB to ioarrin because IOA might complete the command
931 * by the time we are about to add it to the list. Response handler
932 * (isr/tasklet) looks for cmd block in the pending pending list.
933 */
934 spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
935 list_add_tail(&cmd->free_list, &pinstance->pending_cmd_pool);
936 spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
937 atomic_inc(&pinstance->outstanding_cmds);
938
939 /* driver writes lower 32-bit value of IOARCB address only */
940 mb();
941 iowrite32(le32_to_cpu(cmd->ioa_cb->ioarcb.ioarcb_bus_addr),
942 pinstance->ioarrin);
943}
944
945/**
946 * pmcraid_send_cmd - fires a command to IOA
947 *
948 * This function also sets up timeout function, and command completion
949 * function
950 *
951 * @cmd: pointer to the command block to be fired to IOA
952 * @cmd_done: command completion function, called once IOA responds
953 * @timeout: timeout to wait for this command completion
954 * @timeout_func: timeout handler
955 *
956 * Return value
957 * none
958 */
959static void pmcraid_send_cmd(
960 struct pmcraid_cmd *cmd,
961 void (*cmd_done) (struct pmcraid_cmd *),
962 unsigned long timeout,
963 void (*timeout_func) (struct pmcraid_cmd *)
964)
965{
966 /* initialize done function */
967 cmd->cmd_done = cmd_done;
968
969 if (timeout_func) {
970 /* setup timeout handler */
971 cmd->timer.data = (unsigned long)cmd;
972 cmd->timer.expires = jiffies + timeout;
973 cmd->timer.function = (void (*)(unsigned long))timeout_func;
974 add_timer(&cmd->timer);
975 }
976
977 /* fire the command to IOA */
978 _pmcraid_fire_command(cmd);
979}
980
981/**
982 * pmcraid_ioa_shutdown_done - completion function for IOA shutdown command
983 * @cmd: pointer to the command block used for sending IOA shutdown command
984 *
985 * Return value
986 * None
987 */
988static void pmcraid_ioa_shutdown_done(struct pmcraid_cmd *cmd)
989{
990 struct pmcraid_instance *pinstance = cmd->drv_inst;
991 unsigned long lock_flags;
992
993 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
994 pmcraid_ioa_reset(cmd);
995 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
996}
997
998/**
999 * pmcraid_ioa_shutdown - sends SHUTDOWN command to ioa
1000 *
1001 * @cmd: pointer to the command block used as part of reset sequence
1002 *
1003 * Return Value
1004 * None
1005 */
1006static void pmcraid_ioa_shutdown(struct pmcraid_cmd *cmd)
1007{
1008 pmcraid_info("response for Cancel CCN CDB[0] = %x ioasc = %x\n",
1009 cmd->ioa_cb->ioarcb.cdb[0],
1010 le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
1011
1012 /* Note that commands sent during reset require next command to be sent
1013 * to IOA. Hence reinit the done function as well as timeout function
1014 */
1015 pmcraid_reinit_cmdblk(cmd);
1016 cmd->ioa_cb->ioarcb.request_type = REQ_TYPE_IOACMD;
1017 cmd->ioa_cb->ioarcb.resource_handle =
1018 cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1019 cmd->ioa_cb->ioarcb.cdb[0] = PMCRAID_IOA_SHUTDOWN;
1020 cmd->ioa_cb->ioarcb.cdb[1] = PMCRAID_SHUTDOWN_NORMAL;
1021
1022 /* fire shutdown command to hardware. */
1023 pmcraid_info("firing normal shutdown command (%d) to IOA\n",
1024 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle));
1025
1026 pmcraid_notify_ioastate(cmd->drv_inst, PMC_DEVICE_EVENT_SHUTDOWN_START);
1027
1028 pmcraid_send_cmd(cmd, pmcraid_ioa_shutdown_done,
1029 PMCRAID_SHUTDOWN_TIMEOUT,
1030 pmcraid_timeout_handler);
1031}
1032
1033/**
1034 * pmcraid_get_fwversion_done - completion function for get_fwversion
1035 *
1036 * @cmd: pointer to command block used to send INQUIRY command
1037 *
1038 * Return Value
1039 * none
1040 */
1041static void pmcraid_querycfg(struct pmcraid_cmd *);
1042
1043static void pmcraid_get_fwversion_done(struct pmcraid_cmd *cmd)
1044{
1045 struct pmcraid_instance *pinstance = cmd->drv_inst;
1046 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1047 unsigned long lock_flags;
1048
1049 /* configuration table entry size depends on firmware version. If fw
1050 * version is not known, it is not possible to interpret IOA config
1051 * table
1052 */
1053 if (ioasc) {
1054 pmcraid_err("IOA Inquiry failed with %x\n", ioasc);
1055 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
1056 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
1057 pmcraid_reset_alert(cmd);
1058 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
1059 } else {
1060 pmcraid_querycfg(cmd);
1061 }
1062}
1063
1064/**
1065 * pmcraid_get_fwversion - reads firmware version information
1066 *
1067 * @cmd: pointer to command block used to send INQUIRY command
1068 *
1069 * Return Value
1070 * none
1071 */
1072static void pmcraid_get_fwversion(struct pmcraid_cmd *cmd)
1073{
1074 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1075 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
1076 struct pmcraid_instance *pinstance = cmd->drv_inst;
1077 u16 data_size = sizeof(struct pmcraid_inquiry_data);
1078
1079 pmcraid_reinit_cmdblk(cmd);
1080 ioarcb->request_type = REQ_TYPE_SCSI;
1081 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1082 ioarcb->cdb[0] = INQUIRY;
1083 ioarcb->cdb[1] = 1;
1084 ioarcb->cdb[2] = 0xD0;
1085 ioarcb->cdb[3] = (data_size >> 8) & 0xFF;
1086 ioarcb->cdb[4] = data_size & 0xFF;
1087
1088 /* Since entire inquiry data it can be part of IOARCB itself
1089 */
1090 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
1091 offsetof(struct pmcraid_ioarcb,
1092 add_data.u.ioadl[0]));
1093 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
1094 ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
1095
1096 ioarcb->request_flags0 |= NO_LINK_DESCS;
1097 ioarcb->data_transfer_length = cpu_to_le32(data_size);
1098 ioadl = &(ioarcb->add_data.u.ioadl[0]);
1099 ioadl->flags = IOADL_FLAGS_LAST_DESC;
1100 ioadl->address = cpu_to_le64(pinstance->inq_data_baddr);
1101 ioadl->data_len = cpu_to_le32(data_size);
1102
1103 pmcraid_send_cmd(cmd, pmcraid_get_fwversion_done,
1104 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
1105}
1106
1107/**
1108 * pmcraid_identify_hrrq - registers host rrq buffers with IOA
1109 * @cmd: pointer to command block to be used for identify hrrq
1110 *
1111 * Return Value
1112 * none
1113 */
1114static void pmcraid_identify_hrrq(struct pmcraid_cmd *cmd)
1115{
1116 struct pmcraid_instance *pinstance = cmd->drv_inst;
1117 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1118 int index = cmd->hrrq_index;
1119 __be64 hrrq_addr = cpu_to_be64(pinstance->hrrq_start_bus_addr[index]);
1120 u32 hrrq_size = cpu_to_be32(sizeof(u32) * PMCRAID_MAX_CMD);
1121 void (*done_function)(struct pmcraid_cmd *);
1122
1123 pmcraid_reinit_cmdblk(cmd);
1124 cmd->hrrq_index = index + 1;
1125
1126 if (cmd->hrrq_index < pinstance->num_hrrq) {
1127 done_function = pmcraid_identify_hrrq;
1128 } else {
1129 cmd->hrrq_index = 0;
1130 done_function = pmcraid_get_fwversion;
1131 }
1132
1133 /* Initialize ioarcb */
1134 ioarcb->request_type = REQ_TYPE_IOACMD;
1135 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1136
1137 /* initialize the hrrq number where IOA will respond to this command */
1138 ioarcb->hrrq_id = index;
1139 ioarcb->cdb[0] = PMCRAID_IDENTIFY_HRRQ;
1140 ioarcb->cdb[1] = index;
1141
1142 /* IOA expects 64-bit pci address to be written in B.E format
1143 * (i.e cdb[2]=MSByte..cdb[9]=LSB.
1144 */
1145 pmcraid_info("HRRQ_IDENTIFY with hrrq:ioarcb:index => %llx:%llx:%x\n",
1146 hrrq_addr, ioarcb->ioarcb_bus_addr, index);
1147
1148 memcpy(&(ioarcb->cdb[2]), &hrrq_addr, sizeof(hrrq_addr));
1149 memcpy(&(ioarcb->cdb[10]), &hrrq_size, sizeof(hrrq_size));
1150
1151 /* Subsequent commands require HRRQ identification to be successful.
1152 * Note that this gets called even during reset from SCSI mid-layer
1153 * or tasklet
1154 */
1155 pmcraid_send_cmd(cmd, done_function,
1156 PMCRAID_INTERNAL_TIMEOUT,
1157 pmcraid_timeout_handler);
1158}
1159
1160static void pmcraid_process_ccn(struct pmcraid_cmd *cmd);
1161static void pmcraid_process_ldn(struct pmcraid_cmd *cmd);
1162
1163/**
1164 * pmcraid_send_hcam_cmd - send an initialized command block(HCAM) to IOA
1165 *
1166 * @cmd: initialized command block pointer
1167 *
1168 * Return Value
1169 * none
1170 */
1171static void pmcraid_send_hcam_cmd(struct pmcraid_cmd *cmd)
1172{
1173 if (cmd->ioa_cb->ioarcb.cdb[1] == PMCRAID_HCAM_CODE_CONFIG_CHANGE)
1174 atomic_set(&(cmd->drv_inst->ccn.ignore), 0);
1175 else
1176 atomic_set(&(cmd->drv_inst->ldn.ignore), 0);
1177
1178 pmcraid_send_cmd(cmd, cmd->cmd_done, 0, NULL);
1179}
1180
1181/**
1182 * pmcraid_init_hcam - send an initialized command block(HCAM) to IOA
1183 *
1184 * @pinstance: pointer to adapter instance structure
1185 * @type: HCAM type
1186 *
1187 * Return Value
1188 * pointer to initialized pmcraid_cmd structure or NULL
1189 */
1190static struct pmcraid_cmd *pmcraid_init_hcam
1191(
1192 struct pmcraid_instance *pinstance,
1193 u8 type
1194)
1195{
1196 struct pmcraid_cmd *cmd;
1197 struct pmcraid_ioarcb *ioarcb;
1198 struct pmcraid_ioadl_desc *ioadl;
1199 struct pmcraid_hostrcb *hcam;
1200 void (*cmd_done) (struct pmcraid_cmd *);
1201 dma_addr_t dma;
1202 int rcb_size;
1203
1204 cmd = pmcraid_get_free_cmd(pinstance);
1205
1206 if (!cmd) {
1207 pmcraid_err("no free command blocks for hcam\n");
1208 return cmd;
1209 }
1210
1211 if (type == PMCRAID_HCAM_CODE_CONFIG_CHANGE) {
1212 rcb_size = sizeof(struct pmcraid_hcam_ccn_ext);
1213 cmd_done = pmcraid_process_ccn;
1214 dma = pinstance->ccn.baddr + PMCRAID_AEN_HDR_SIZE;
1215 hcam = &pinstance->ccn;
1216 } else {
1217 rcb_size = sizeof(struct pmcraid_hcam_ldn);
1218 cmd_done = pmcraid_process_ldn;
1219 dma = pinstance->ldn.baddr + PMCRAID_AEN_HDR_SIZE;
1220 hcam = &pinstance->ldn;
1221 }
1222
1223 /* initialize command pointer used for HCAM registration */
1224 hcam->cmd = cmd;
1225
1226 ioarcb = &cmd->ioa_cb->ioarcb;
1227 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
1228 offsetof(struct pmcraid_ioarcb,
1229 add_data.u.ioadl[0]));
1230 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
1231 ioadl = ioarcb->add_data.u.ioadl;
1232
1233 /* Initialize ioarcb */
1234 ioarcb->request_type = REQ_TYPE_HCAM;
1235 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1236 ioarcb->cdb[0] = PMCRAID_HOST_CONTROLLED_ASYNC;
1237 ioarcb->cdb[1] = type;
1238 ioarcb->cdb[7] = (rcb_size >> 8) & 0xFF;
1239 ioarcb->cdb[8] = (rcb_size) & 0xFF;
1240
1241 ioarcb->data_transfer_length = cpu_to_le32(rcb_size);
1242
1243 ioadl[0].flags |= IOADL_FLAGS_READ_LAST;
1244 ioadl[0].data_len = cpu_to_le32(rcb_size);
1245 ioadl[0].address = cpu_to_le32(dma);
1246
1247 cmd->cmd_done = cmd_done;
1248 return cmd;
1249}
1250
1251/**
1252 * pmcraid_send_hcam - Send an HCAM to IOA
1253 * @pinstance: ioa config struct
1254 * @type: HCAM type
1255 *
1256 * This function will send a Host Controlled Async command to IOA.
1257 *
1258 * Return value:
1259 * none
1260 */
1261static void pmcraid_send_hcam(struct pmcraid_instance *pinstance, u8 type)
1262{
1263 struct pmcraid_cmd *cmd = pmcraid_init_hcam(pinstance, type);
1264 pmcraid_send_hcam_cmd(cmd);
1265}
1266
1267
1268/**
1269 * pmcraid_prepare_cancel_cmd - prepares a command block to abort another
1270 *
1271 * @cmd: pointer to cmd that is used as cancelling command
1272 * @cmd_to_cancel: pointer to the command that needs to be cancelled
1273 */
1274static void pmcraid_prepare_cancel_cmd(
1275 struct pmcraid_cmd *cmd,
1276 struct pmcraid_cmd *cmd_to_cancel
1277)
1278{
1279 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1280 __be64 ioarcb_addr = cmd_to_cancel->ioa_cb->ioarcb.ioarcb_bus_addr;
1281
1282 /* Get the resource handle to where the command to be aborted has been
1283 * sent.
1284 */
1285 ioarcb->resource_handle = cmd_to_cancel->ioa_cb->ioarcb.resource_handle;
1286 ioarcb->request_type = REQ_TYPE_IOACMD;
1287 memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
1288 ioarcb->cdb[0] = PMCRAID_ABORT_CMD;
1289
1290 /* IOARCB address of the command to be cancelled is given in
1291 * cdb[2]..cdb[9] is Big-Endian format. Note that length bits in
1292 * IOARCB address are not masked.
1293 */
1294 ioarcb_addr = cpu_to_be64(ioarcb_addr);
1295 memcpy(&(ioarcb->cdb[2]), &ioarcb_addr, sizeof(ioarcb_addr));
1296}
1297
1298/**
1299 * pmcraid_cancel_hcam - sends ABORT task to abort a given HCAM
1300 *
1301 * @cmd: command to be used as cancelling command
1302 * @type: HCAM type
1303 * @cmd_done: op done function for the cancelling command
1304 */
1305static void pmcraid_cancel_hcam(
1306 struct pmcraid_cmd *cmd,
1307 u8 type,
1308 void (*cmd_done) (struct pmcraid_cmd *)
1309)
1310{
1311 struct pmcraid_instance *pinstance;
1312 struct pmcraid_hostrcb *hcam;
1313
1314 pinstance = cmd->drv_inst;
1315 hcam = (type == PMCRAID_HCAM_CODE_LOG_DATA) ?
1316 &pinstance->ldn : &pinstance->ccn;
1317
1318 /* prepare for cancelling previous hcam command. If the HCAM is
1319 * currently not pending with IOA, we would have hcam->cmd as non-null
1320 */
1321 if (hcam->cmd == NULL)
1322 return;
1323
1324 pmcraid_prepare_cancel_cmd(cmd, hcam->cmd);
1325
1326 /* writing to IOARRIN must be protected by host_lock, as mid-layer
1327 * schedule queuecommand while we are doing this
1328 */
1329 pmcraid_send_cmd(cmd, cmd_done,
1330 PMCRAID_INTERNAL_TIMEOUT,
1331 pmcraid_timeout_handler);
1332}
1333
1334/**
1335 * pmcraid_cancel_ccn - cancel CCN HCAM already registered with IOA
1336 *
1337 * @cmd: command block to be used for cancelling the HCAM
1338 */
1339static void pmcraid_cancel_ccn(struct pmcraid_cmd *cmd)
1340{
1341 pmcraid_info("response for Cancel LDN CDB[0] = %x ioasc = %x\n",
1342 cmd->ioa_cb->ioarcb.cdb[0],
1343 le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
1344
1345 pmcraid_reinit_cmdblk(cmd);
1346
1347 pmcraid_cancel_hcam(cmd,
1348 PMCRAID_HCAM_CODE_CONFIG_CHANGE,
1349 pmcraid_ioa_shutdown);
1350}
1351
1352/**
1353 * pmcraid_cancel_ldn - cancel LDN HCAM already registered with IOA
1354 *
1355 * @cmd: command block to be used for cancelling the HCAM
1356 */
1357static void pmcraid_cancel_ldn(struct pmcraid_cmd *cmd)
1358{
1359 pmcraid_cancel_hcam(cmd,
1360 PMCRAID_HCAM_CODE_LOG_DATA,
1361 pmcraid_cancel_ccn);
1362}
1363
1364/**
1365 * pmcraid_expose_resource - check if the resource can be exposed to OS
1366 *
1367 * @fw_version: firmware version code
1368 * @cfgte: pointer to configuration table entry of the resource
1369 *
1370 * Return value:
1371 * true if resource can be added to midlayer, false(0) otherwise
1372 */
1373static int pmcraid_expose_resource(u16 fw_version,
1374 struct pmcraid_config_table_entry *cfgte)
1375{
1376 int retval = 0;
1377
1378 if (cfgte->resource_type == RES_TYPE_VSET) {
1379 if (fw_version <= PMCRAID_FW_VERSION_1)
1380 retval = ((cfgte->unique_flags1 & 0x80) == 0);
1381 else
1382 retval = ((cfgte->unique_flags0 & 0x80) == 0 &&
1383 (cfgte->unique_flags1 & 0x80) == 0);
1384
1385 } else if (cfgte->resource_type == RES_TYPE_GSCSI)
1386 retval = (RES_BUS(cfgte->resource_address) !=
1387 PMCRAID_VIRTUAL_ENCL_BUS_ID);
1388 return retval;
1389}
1390
1391/* attributes supported by pmcraid_event_family */
1392enum {
1393 PMCRAID_AEN_ATTR_UNSPEC,
1394 PMCRAID_AEN_ATTR_EVENT,
1395 __PMCRAID_AEN_ATTR_MAX,
1396};
1397#define PMCRAID_AEN_ATTR_MAX (__PMCRAID_AEN_ATTR_MAX - 1)
1398
1399/* commands supported by pmcraid_event_family */
1400enum {
1401 PMCRAID_AEN_CMD_UNSPEC,
1402 PMCRAID_AEN_CMD_EVENT,
1403 __PMCRAID_AEN_CMD_MAX,
1404};
1405#define PMCRAID_AEN_CMD_MAX (__PMCRAID_AEN_CMD_MAX - 1)
1406
1407static struct genl_family pmcraid_event_family = {
1408 .id = GENL_ID_GENERATE,
1409 .name = "pmcraid",
1410 .version = 1,
1411 .maxattr = PMCRAID_AEN_ATTR_MAX
1412};
1413
1414/**
1415 * pmcraid_netlink_init - registers pmcraid_event_family
1416 *
1417 * Return value:
1418 * 0 if the pmcraid_event_family is successfully registered
1419 * with netlink generic, non-zero otherwise
1420 */
1421static int pmcraid_netlink_init(void)
1422{
1423 int result;
1424
1425 result = genl_register_family(&pmcraid_event_family);
1426
1427 if (result)
1428 return result;
1429
1430 pmcraid_info("registered NETLINK GENERIC group: %d\n",
1431 pmcraid_event_family.id);
1432
1433 return result;
1434}
1435
1436/**
1437 * pmcraid_netlink_release - unregisters pmcraid_event_family
1438 *
1439 * Return value:
1440 * none
1441 */
1442static void pmcraid_netlink_release(void)
1443{
1444 genl_unregister_family(&pmcraid_event_family);
1445}
1446
1447/**
1448 * pmcraid_notify_aen - sends event msg to user space application
1449 * @pinstance: pointer to adapter instance structure
1450 * @type: HCAM type
1451 *
1452 * Return value:
1453 * 0 if success, error value in case of any failure.
1454 */
1455static int pmcraid_notify_aen(
1456 struct pmcraid_instance *pinstance,
1457 struct pmcraid_aen_msg *aen_msg,
1458 u32 data_size
1459)
1460{
1461 struct sk_buff *skb;
1462 void *msg_header;
1463 u32 total_size, nla_genl_hdr_total_size;
1464 int result;
1465
1466 aen_msg->hostno = (pinstance->host->unique_id << 16 |
1467 MINOR(pinstance->cdev.dev));
1468 aen_msg->length = data_size;
1469
1470 data_size += sizeof(*aen_msg);
1471
1472 total_size = nla_total_size(data_size);
1473 /* Add GENL_HDR to total_size */
1474 nla_genl_hdr_total_size =
1475 (total_size + (GENL_HDRLEN +
1476 ((struct genl_family *)&pmcraid_event_family)->hdrsize)
1477 + NLMSG_HDRLEN);
1478 skb = genlmsg_new(nla_genl_hdr_total_size, GFP_ATOMIC);
1479
1480
1481 if (!skb) {
1482 pmcraid_err("Failed to allocate aen data SKB of size: %x\n",
1483 total_size);
1484 return -ENOMEM;
1485 }
1486
1487 /* add the genetlink message header */
1488 msg_header = genlmsg_put(skb, 0, 0,
1489 &pmcraid_event_family, 0,
1490 PMCRAID_AEN_CMD_EVENT);
1491 if (!msg_header) {
1492 pmcraid_err("failed to copy command details\n");
1493 nlmsg_free(skb);
1494 return -ENOMEM;
1495 }
1496
1497 result = nla_put(skb, PMCRAID_AEN_ATTR_EVENT, data_size, aen_msg);
1498
1499 if (result) {
1500 pmcraid_err("failed to copy AEN attribute data\n");
1501 nlmsg_free(skb);
1502 return -EINVAL;
1503 }
1504
1505 /* send genetlink multicast message to notify appplications */
1506 result = genlmsg_end(skb, msg_header);
1507
1508 if (result < 0) {
1509 pmcraid_err("genlmsg_end failed\n");
1510 nlmsg_free(skb);
1511 return result;
1512 }
1513
1514 result =
1515 genlmsg_multicast(skb, 0, pmcraid_event_family.id, GFP_ATOMIC);
1516
1517 /* If there are no listeners, genlmsg_multicast may return non-zero
1518 * value.
1519 */
1520 if (result)
1521 pmcraid_info("error (%x) sending aen event message\n", result);
1522 return result;
1523}
1524
1525/**
1526 * pmcraid_notify_ccn - notifies about CCN event msg to user space
1527 * @pinstance: pointer adapter instance structure
1528 *
1529 * Return value:
1530 * 0 if success, error value in case of any failure
1531 */
1532static int pmcraid_notify_ccn(struct pmcraid_instance *pinstance)
1533{
1534 return pmcraid_notify_aen(pinstance,
1535 pinstance->ccn.msg,
1536 pinstance->ccn.hcam->data_len +
1537 sizeof(struct pmcraid_hcam_hdr));
1538}
1539
1540/**
1541 * pmcraid_notify_ldn - notifies about CCN event msg to user space
1542 * @pinstance: pointer adapter instance structure
1543 *
1544 * Return value:
1545 * 0 if success, error value in case of any failure
1546 */
1547static int pmcraid_notify_ldn(struct pmcraid_instance *pinstance)
1548{
1549 return pmcraid_notify_aen(pinstance,
1550 pinstance->ldn.msg,
1551 pinstance->ldn.hcam->data_len +
1552 sizeof(struct pmcraid_hcam_hdr));
1553}
1554
1555/**
1556 * pmcraid_notify_ioastate - sends IOA state event msg to user space
1557 * @pinstance: pointer adapter instance structure
1558 * @evt: controller state event to be sent
1559 *
1560 * Return value:
1561 * 0 if success, error value in case of any failure
1562 */
1563static void pmcraid_notify_ioastate(struct pmcraid_instance *pinstance, u32 evt)
1564{
1565 pinstance->scn.ioa_state = evt;
1566 pmcraid_notify_aen(pinstance,
1567 &pinstance->scn.msg,
1568 sizeof(u32));
1569}
1570
1571/**
1572 * pmcraid_handle_config_change - Handle a config change from the adapter
1573 * @pinstance: pointer to per adapter instance structure
1574 *
1575 * Return value:
1576 * none
1577 */
1578
1579static void pmcraid_handle_config_change(struct pmcraid_instance *pinstance)
1580{
1581 struct pmcraid_config_table_entry *cfg_entry;
1582 struct pmcraid_hcam_ccn *ccn_hcam;
1583 struct pmcraid_cmd *cmd;
1584 struct pmcraid_cmd *cfgcmd;
1585 struct pmcraid_resource_entry *res = NULL;
1586 unsigned long lock_flags;
1587 unsigned long host_lock_flags;
1588 u32 new_entry = 1;
1589 u32 hidden_entry = 0;
1590 u16 fw_version;
1591 int rc;
1592
1593 ccn_hcam = (struct pmcraid_hcam_ccn *)pinstance->ccn.hcam;
1594 cfg_entry = &ccn_hcam->cfg_entry;
1595 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
1596
1597 pmcraid_info("CCN(%x): %x timestamp: %llx type: %x lost: %x flags: %x \
1598 res: %x:%x:%x:%x\n",
1599 pinstance->ccn.hcam->ilid,
1600 pinstance->ccn.hcam->op_code,
1601 ((pinstance->ccn.hcam->timestamp1) |
1602 ((pinstance->ccn.hcam->timestamp2 & 0xffffffffLL) << 32)),
1603 pinstance->ccn.hcam->notification_type,
1604 pinstance->ccn.hcam->notification_lost,
1605 pinstance->ccn.hcam->flags,
1606 pinstance->host->unique_id,
1607 RES_IS_VSET(*cfg_entry) ? PMCRAID_VSET_BUS_ID :
1608 (RES_IS_GSCSI(*cfg_entry) ? PMCRAID_PHYS_BUS_ID :
1609 RES_BUS(cfg_entry->resource_address)),
1610 RES_IS_VSET(*cfg_entry) ?
1611 (fw_version <= PMCRAID_FW_VERSION_1 ?
1612 cfg_entry->unique_flags1 :
1613 cfg_entry->array_id & 0xFF) :
1614 RES_TARGET(cfg_entry->resource_address),
1615 RES_LUN(cfg_entry->resource_address));
1616
1617
1618 /* If this HCAM indicates a lost notification, read the config table */
1619 if (pinstance->ccn.hcam->notification_lost) {
1620 cfgcmd = pmcraid_get_free_cmd(pinstance);
1621 if (cfgcmd) {
1622 pmcraid_info("lost CCN, reading config table\b");
1623 pinstance->reinit_cfg_table = 1;
1624 pmcraid_querycfg(cfgcmd);
1625 } else {
1626 pmcraid_err("lost CCN, no free cmd for querycfg\n");
1627 }
1628 goto out_notify_apps;
1629 }
1630
1631 /* If this resource is not going to be added to mid-layer, just notify
1632 * applications and return. If this notification is about hiding a VSET
1633 * resource, check if it was exposed already.
1634 */
1635 if (pinstance->ccn.hcam->notification_type ==
1636 NOTIFICATION_TYPE_ENTRY_CHANGED &&
1637 cfg_entry->resource_type == RES_TYPE_VSET) {
1638
1639 if (fw_version <= PMCRAID_FW_VERSION_1)
1640 hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;
1641 else
1642 hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;
1643
1644 } else if (!pmcraid_expose_resource(fw_version, cfg_entry)) {
1645 goto out_notify_apps;
1646 }
1647
1648 spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
1649 list_for_each_entry(res, &pinstance->used_res_q, queue) {
1650 rc = memcmp(&res->cfg_entry.resource_address,
1651 &cfg_entry->resource_address,
1652 sizeof(cfg_entry->resource_address));
1653 if (!rc) {
1654 new_entry = 0;
1655 break;
1656 }
1657 }
1658
1659 if (new_entry) {
1660
1661 if (hidden_entry) {
1662 spin_unlock_irqrestore(&pinstance->resource_lock,
1663 lock_flags);
1664 goto out_notify_apps;
1665 }
1666
1667 /* If there are more number of resources than what driver can
1668 * manage, do not notify the applications about the CCN. Just
1669 * ignore this notifications and re-register the same HCAM
1670 */
1671 if (list_empty(&pinstance->free_res_q)) {
1672 spin_unlock_irqrestore(&pinstance->resource_lock,
1673 lock_flags);
1674 pmcraid_err("too many resources attached\n");
1675 spin_lock_irqsave(pinstance->host->host_lock,
1676 host_lock_flags);
1677 pmcraid_send_hcam(pinstance,
1678 PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1679 spin_unlock_irqrestore(pinstance->host->host_lock,
1680 host_lock_flags);
1681 return;
1682 }
1683
1684 res = list_entry(pinstance->free_res_q.next,
1685 struct pmcraid_resource_entry, queue);
1686
1687 list_del(&res->queue);
1688 res->scsi_dev = NULL;
1689 res->reset_progress = 0;
1690 list_add_tail(&res->queue, &pinstance->used_res_q);
1691 }
1692
1693 memcpy(&res->cfg_entry, cfg_entry, pinstance->config_table_entry_size);
1694
1695 if (pinstance->ccn.hcam->notification_type ==
1696 NOTIFICATION_TYPE_ENTRY_DELETED || hidden_entry) {
1697 if (res->scsi_dev) {
1698 if (fw_version <= PMCRAID_FW_VERSION_1)
1699 res->cfg_entry.unique_flags1 &= 0x7F;
1700 else
1701 res->cfg_entry.array_id &= 0xFF;
1702 res->change_detected = RES_CHANGE_DEL;
1703 res->cfg_entry.resource_handle =
1704 PMCRAID_INVALID_RES_HANDLE;
1705 schedule_work(&pinstance->worker_q);
1706 } else {
1707 /* This may be one of the non-exposed resources */
1708 list_move_tail(&res->queue, &pinstance->free_res_q);
1709 }
1710 } else if (!res->scsi_dev) {
1711 res->change_detected = RES_CHANGE_ADD;
1712 schedule_work(&pinstance->worker_q);
1713 }
1714 spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
1715
1716out_notify_apps:
1717
1718 /* Notify configuration changes to registered applications.*/
1719 if (!pmcraid_disable_aen)
1720 pmcraid_notify_ccn(pinstance);
1721
1722 cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1723 if (cmd)
1724 pmcraid_send_hcam_cmd(cmd);
1725}
1726
1727/**
1728 * pmcraid_get_error_info - return error string for an ioasc
1729 * @ioasc: ioasc code
1730 * Return Value
1731 * none
1732 */
1733static struct pmcraid_ioasc_error *pmcraid_get_error_info(u32 ioasc)
1734{
1735 int i;
1736 for (i = 0; i < ARRAY_SIZE(pmcraid_ioasc_error_table); i++) {
1737 if (pmcraid_ioasc_error_table[i].ioasc_code == ioasc)
1738 return &pmcraid_ioasc_error_table[i];
1739 }
1740 return NULL;
1741}
1742
1743/**
1744 * pmcraid_ioasc_logger - log IOASC information based user-settings
1745 * @ioasc: ioasc code
1746 * @cmd: pointer to command that resulted in 'ioasc'
1747 */
1748void pmcraid_ioasc_logger(u32 ioasc, struct pmcraid_cmd *cmd)
1749{
1750 struct pmcraid_ioasc_error *error_info = pmcraid_get_error_info(ioasc);
1751
1752 if (error_info == NULL ||
1753 cmd->drv_inst->current_log_level < error_info->log_level)
1754 return;
1755
1756 /* log the error string */
1757 pmcraid_err("cmd [%x] for resource %x failed with %x(%s)\n",
1758 cmd->ioa_cb->ioarcb.cdb[0],
1759 cmd->ioa_cb->ioarcb.resource_handle,
1760 le32_to_cpu(ioasc), error_info->error_string);
1761}
1762
1763/**
1764 * pmcraid_handle_error_log - Handle a config change (error log) from the IOA
1765 *
1766 * @pinstance: pointer to per adapter instance structure
1767 *
1768 * Return value:
1769 * none
1770 */
1771static void pmcraid_handle_error_log(struct pmcraid_instance *pinstance)
1772{
1773 struct pmcraid_hcam_ldn *hcam_ldn;
1774 u32 ioasc;
1775
1776 hcam_ldn = (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
1777
1778 pmcraid_info
1779 ("LDN(%x): %x type: %x lost: %x flags: %x overlay id: %x\n",
1780 pinstance->ldn.hcam->ilid,
1781 pinstance->ldn.hcam->op_code,
1782 pinstance->ldn.hcam->notification_type,
1783 pinstance->ldn.hcam->notification_lost,
1784 pinstance->ldn.hcam->flags,
1785 pinstance->ldn.hcam->overlay_id);
1786
1787 /* log only the errors, no need to log informational log entries */
1788 if (pinstance->ldn.hcam->notification_type !=
1789 NOTIFICATION_TYPE_ERROR_LOG)
1790 return;
1791
1792 if (pinstance->ldn.hcam->notification_lost ==
1793 HOSTRCB_NOTIFICATIONS_LOST)
1794 dev_info(&pinstance->pdev->dev, "Error notifications lost\n");
1795
1796 ioasc = le32_to_cpu(hcam_ldn->error_log.fd_ioasc);
1797
1798 if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
1799 ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER) {
1800 dev_info(&pinstance->pdev->dev,
1801 "UnitAttention due to IOA Bus Reset\n");
1802 scsi_report_bus_reset(
1803 pinstance->host,
1804 RES_BUS(hcam_ldn->error_log.fd_ra));
1805 }
1806
1807 return;
1808}
1809
1810/**
1811 * pmcraid_process_ccn - Op done function for a CCN.
1812 * @cmd: pointer to command struct
1813 *
1814 * This function is the op done function for a configuration
1815 * change notification
1816 *
1817 * Return value:
1818 * none
1819 */
1820static void pmcraid_process_ccn(struct pmcraid_cmd *cmd)
1821{
1822 struct pmcraid_instance *pinstance = cmd->drv_inst;
1823 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1824 unsigned long lock_flags;
1825
1826 pinstance->ccn.cmd = NULL;
1827 pmcraid_return_cmd(cmd);
1828
1829 /* If driver initiated IOA reset happened while this hcam was pending
1830 * with IOA, or IOA bringdown sequence is in progress, no need to
1831 * re-register the hcam
1832 */
1833 if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
1834 atomic_read(&pinstance->ccn.ignore) == 1) {
1835 return;
1836 } else if (ioasc) {
1837 dev_info(&pinstance->pdev->dev,
1838 "Host RCB (CCN) failed with IOASC: 0x%08X\n", ioasc);
1839 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
1840 pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1841 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
1842 } else {
1843 pmcraid_handle_config_change(pinstance);
1844 }
1845}
1846
1847/**
1848 * pmcraid_process_ldn - op done function for an LDN
1849 * @cmd: pointer to command block
1850 *
1851 * Return value
1852 * none
1853 */
1854static void pmcraid_initiate_reset(struct pmcraid_instance *);
1855static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd);
1856
1857static void pmcraid_process_ldn(struct pmcraid_cmd *cmd)
1858{
1859 struct pmcraid_instance *pinstance = cmd->drv_inst;
1860 struct pmcraid_hcam_ldn *ldn_hcam =
1861 (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
1862 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1863 u32 fd_ioasc = le32_to_cpu(ldn_hcam->error_log.fd_ioasc);
1864 unsigned long lock_flags;
1865
1866 /* return the command block back to freepool */
1867 pinstance->ldn.cmd = NULL;
1868 pmcraid_return_cmd(cmd);
1869
1870 /* If driver initiated IOA reset happened while this hcam was pending
1871 * with IOA, no need to re-register the hcam as reset engine will do it
1872 * once reset sequence is complete
1873 */
1874 if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
1875 atomic_read(&pinstance->ccn.ignore) == 1) {
1876 return;
1877 } else if (!ioasc) {
1878 pmcraid_handle_error_log(pinstance);
1879 if (fd_ioasc == PMCRAID_IOASC_NR_IOA_RESET_REQUIRED) {
1880 spin_lock_irqsave(pinstance->host->host_lock,
1881 lock_flags);
1882 pmcraid_initiate_reset(pinstance);
1883 spin_unlock_irqrestore(pinstance->host->host_lock,
1884 lock_flags);
1885 return;
1886 }
1887 if (fd_ioasc == PMCRAID_IOASC_TIME_STAMP_OUT_OF_SYNC) {
1888 pinstance->timestamp_error = 1;
1889 pmcraid_set_timestamp(cmd);
1890 }
1891 } else {
1892 dev_info(&pinstance->pdev->dev,
1893 "Host RCB(LDN) failed with IOASC: 0x%08X\n", ioasc);
1894 }
1895 /* send netlink message for HCAM notification if enabled */
1896 if (!pmcraid_disable_aen)
1897 pmcraid_notify_ldn(pinstance);
1898
1899 cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
1900 if (cmd)
1901 pmcraid_send_hcam_cmd(cmd);
1902}
1903
1904/**
1905 * pmcraid_register_hcams - register HCAMs for CCN and LDN
1906 *
1907 * @pinstance: pointer per adapter instance structure
1908 *
1909 * Return Value
1910 * none
1911 */
1912static void pmcraid_register_hcams(struct pmcraid_instance *pinstance)
1913{
1914 pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1915 pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
1916}
1917
1918/**
1919 * pmcraid_unregister_hcams - cancel HCAMs registered already
1920 * @cmd: pointer to command used as part of reset sequence
1921 */
1922static void pmcraid_unregister_hcams(struct pmcraid_cmd *cmd)
1923{
1924 struct pmcraid_instance *pinstance = cmd->drv_inst;
1925
1926 /* During IOA bringdown, HCAM gets fired and tasklet proceeds with
1927 * handling hcam response though it is not necessary. In order to
1928 * prevent this, set 'ignore', so that bring-down sequence doesn't
1929 * re-send any more hcams
1930 */
1931 atomic_set(&pinstance->ccn.ignore, 1);
1932 atomic_set(&pinstance->ldn.ignore, 1);
1933
1934 /* If adapter reset was forced as part of runtime reset sequence,
1935 * start the reset sequence. Reset will be triggered even in case
1936 * IOA unit_check.
1937 */
1938 if ((pinstance->force_ioa_reset && !pinstance->ioa_bringdown) ||
1939 pinstance->ioa_unit_check) {
1940 pinstance->force_ioa_reset = 0;
1941 pinstance->ioa_unit_check = 0;
1942 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
1943 pmcraid_reset_alert(cmd);
1944 return;
1945 }
1946
1947 /* Driver tries to cancel HCAMs by sending ABORT TASK for each HCAM
1948 * one after the other. So CCN cancellation will be triggered by
1949 * pmcraid_cancel_ldn itself.
1950 */
1951 pmcraid_cancel_ldn(cmd);
1952}
1953
1954/**
1955 * pmcraid_reset_enable_ioa - re-enable IOA after a hard reset
1956 * @pinstance: pointer to adapter instance structure
1957 * Return Value
1958 * 1 if TRANSITION_TO_OPERATIONAL is active, otherwise 0
1959 */
1960static void pmcraid_reinit_buffers(struct pmcraid_instance *);
1961
1962static int pmcraid_reset_enable_ioa(struct pmcraid_instance *pinstance)
1963{
1964 u32 intrs;
1965
1966 pmcraid_reinit_buffers(pinstance);
1967 intrs = pmcraid_read_interrupts(pinstance);
1968
1969 pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
1970
1971 if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
1972 if (!pinstance->interrupt_mode) {
1973 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
1974 pinstance->int_regs.
1975 ioa_host_interrupt_mask_reg);
1976 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
1977 pinstance->int_regs.ioa_host_interrupt_clr_reg);
1978 }
1979 return 1;
1980 } else {
1981 return 0;
1982 }
1983}
1984
1985/**
1986 * pmcraid_soft_reset - performs a soft reset and makes IOA become ready
1987 * @cmd : pointer to reset command block
1988 *
1989 * Return Value
1990 * none
1991 */
1992static void pmcraid_soft_reset(struct pmcraid_cmd *cmd)
1993{
1994 struct pmcraid_instance *pinstance = cmd->drv_inst;
1995 u32 int_reg;
1996 u32 doorbell;
1997
1998 /* There will be an interrupt when Transition to Operational bit is
1999 * set so tasklet would execute next reset task. The timeout handler
2000 * would re-initiate a reset
2001 */
2002 cmd->cmd_done = pmcraid_ioa_reset;
2003 cmd->timer.data = (unsigned long)cmd;
2004 cmd->timer.expires = jiffies +
2005 msecs_to_jiffies(PMCRAID_TRANSOP_TIMEOUT);
2006 cmd->timer.function = (void (*)(unsigned long))pmcraid_timeout_handler;
2007
2008 if (!timer_pending(&cmd->timer))
2009 add_timer(&cmd->timer);
2010
2011 /* Enable destructive diagnostics on IOA if it is not yet in
2012 * operational state
2013 */
2014 doorbell = DOORBELL_RUNTIME_RESET |
2015 DOORBELL_ENABLE_DESTRUCTIVE_DIAGS;
2016
2017 /* Since we do RESET_ALERT and Start BIST we have to again write
2018 * MSIX Doorbell to indicate the interrupt mode
2019 */
2020 if (pinstance->interrupt_mode) {
2021 iowrite32(DOORBELL_INTR_MODE_MSIX,
2022 pinstance->int_regs.host_ioa_interrupt_reg);
2023 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
2024 }
2025
2026 iowrite32(doorbell, pinstance->int_regs.host_ioa_interrupt_reg);
2027 ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
2028 int_reg = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
2029
2030 pmcraid_info("Waiting for IOA to become operational %x:%x\n",
2031 ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
2032 int_reg);
2033}
2034
2035/**
2036 * pmcraid_get_dump - retrieves IOA dump in case of Unit Check interrupt
2037 *
2038 * @pinstance: pointer to adapter instance structure
2039 *
2040 * Return Value
2041 * none
2042 */
2043static void pmcraid_get_dump(struct pmcraid_instance *pinstance)
2044{
2045 pmcraid_info("%s is not yet implemented\n", __func__);
2046}
2047
2048/**
2049 * pmcraid_fail_outstanding_cmds - Fails all outstanding ops.
2050 * @pinstance: pointer to adapter instance structure
2051 *
2052 * This function fails all outstanding ops. If they are submitted to IOA
2053 * already, it sends cancel all messages if IOA is still accepting IOARCBs,
2054 * otherwise just completes the commands and returns the cmd blocks to free
2055 * pool.
2056 *
2057 * Return value:
2058 * none
2059 */
2060static void pmcraid_fail_outstanding_cmds(struct pmcraid_instance *pinstance)
2061{
2062 struct pmcraid_cmd *cmd, *temp;
2063 unsigned long lock_flags;
2064
2065 /* pending command list is protected by pending_pool_lock. Its
2066 * traversal must be done as within this lock
2067 */
2068 spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
2069 list_for_each_entry_safe(cmd, temp, &pinstance->pending_cmd_pool,
2070 free_list) {
2071 list_del(&cmd->free_list);
2072 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
2073 lock_flags);
2074 cmd->ioa_cb->ioasa.ioasc =
2075 cpu_to_le32(PMCRAID_IOASC_IOA_WAS_RESET);
2076 cmd->ioa_cb->ioasa.ilid =
2077 cpu_to_be32(PMCRAID_DRIVER_ILID);
2078
2079 /* In case the command timer is still running */
2080 del_timer(&cmd->timer);
2081
2082 /* If this is an IO command, complete it by invoking scsi_done
2083 * function. If this is one of the internal commands other
2084 * than pmcraid_ioa_reset and HCAM commands invoke cmd_done to
2085 * complete it
2086 */
2087 if (cmd->scsi_cmd) {
2088
2089 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2090 __le32 resp = cmd->ioa_cb->ioarcb.response_handle;
2091
2092 scsi_cmd->result |= DID_ERROR << 16;
2093
2094 scsi_dma_unmap(scsi_cmd);
2095 pmcraid_return_cmd(cmd);
2096
2097 pmcraid_info("failing(%d) CDB[0] = %x result: %x\n",
2098 le32_to_cpu(resp) >> 2,
2099 cmd->ioa_cb->ioarcb.cdb[0],
2100 scsi_cmd->result);
2101 scsi_cmd->scsi_done(scsi_cmd);
2102 } else if (cmd->cmd_done == pmcraid_internal_done ||
2103 cmd->cmd_done == pmcraid_erp_done) {
2104 cmd->cmd_done(cmd);
2105 } else if (cmd->cmd_done != pmcraid_ioa_reset &&
2106 cmd->cmd_done != pmcraid_ioa_shutdown_done) {
2107 pmcraid_return_cmd(cmd);
2108 }
2109
2110 atomic_dec(&pinstance->outstanding_cmds);
2111 spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
2112 }
2113
2114 spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
2115}
2116
2117/**
2118 * pmcraid_ioa_reset - Implementation of IOA reset logic
2119 *
2120 * @cmd: pointer to the cmd block to be used for entire reset process
2121 *
2122 * This function executes most of the steps required for IOA reset. This gets
2123 * called by user threads (modprobe/insmod/rmmod) timer, tasklet and midlayer's
2124 * 'eh_' thread. Access to variables used for controlling the reset sequence is
2125 * synchronized using host lock. Various functions called during reset process
2126 * would make use of a single command block, pointer to which is also stored in
2127 * adapter instance structure.
2128 *
2129 * Return Value
2130 * None
2131 */
2132static void pmcraid_ioa_reset(struct pmcraid_cmd *cmd)
2133{
2134 struct pmcraid_instance *pinstance = cmd->drv_inst;
2135 u8 reset_complete = 0;
2136
2137 pinstance->ioa_reset_in_progress = 1;
2138
2139 if (pinstance->reset_cmd != cmd) {
2140 pmcraid_err("reset is called with different command block\n");
2141 pinstance->reset_cmd = cmd;
2142 }
2143
2144 pmcraid_info("reset_engine: state = %d, command = %p\n",
2145 pinstance->ioa_state, cmd);
2146
2147 switch (pinstance->ioa_state) {
2148
2149 case IOA_STATE_DEAD:
2150 /* If IOA is offline, whatever may be the reset reason, just
2151 * return. callers might be waiting on the reset wait_q, wake
2152 * up them
2153 */
2154 pmcraid_err("IOA is offline no reset is possible\n");
2155 reset_complete = 1;
2156 break;
2157
2158 case IOA_STATE_IN_BRINGDOWN:
2159 /* we enter here, once ioa shutdown command is processed by IOA
2160 * Alert IOA for a possible reset. If reset alert fails, IOA
2161 * goes through hard-reset
2162 */
2163 pmcraid_disable_interrupts(pinstance, ~0);
2164 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2165 pmcraid_reset_alert(cmd);
2166 break;
2167
2168 case IOA_STATE_UNKNOWN:
2169 /* We may be called during probe or resume. Some pre-processing
2170 * is required for prior to reset
2171 */
2172 scsi_block_requests(pinstance->host);
2173
2174 /* If asked to reset while IOA was processing responses or
2175 * there are any error responses then IOA may require
2176 * hard-reset.
2177 */
2178 if (pinstance->ioa_hard_reset == 0) {
2179 if (ioread32(pinstance->ioa_status) &
2180 INTRS_TRANSITION_TO_OPERATIONAL) {
2181 pmcraid_info("sticky bit set, bring-up\n");
2182 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2183 pmcraid_reinit_cmdblk(cmd);
2184 pmcraid_identify_hrrq(cmd);
2185 } else {
2186 pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
2187 pmcraid_soft_reset(cmd);
2188 }
2189 } else {
2190 /* Alert IOA of a possible reset and wait for critical
2191 * operation in progress bit to reset
2192 */
2193 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2194 pmcraid_reset_alert(cmd);
2195 }
2196 break;
2197
2198 case IOA_STATE_IN_RESET_ALERT:
2199 /* If critical operation in progress bit is reset or wait gets
2200 * timed out, reset proceeds with starting BIST on the IOA.
2201 * pmcraid_ioa_hard_reset keeps a count of reset attempts. If
2202 * they are 3 or more, reset engine marks IOA dead and returns
2203 */
2204 pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
2205 pmcraid_start_bist(cmd);
2206 break;
2207
2208 case IOA_STATE_IN_HARD_RESET:
2209 pinstance->ioa_reset_attempts++;
2210
2211 /* retry reset if we haven't reached maximum allowed limit */
2212 if (pinstance->ioa_reset_attempts > PMCRAID_RESET_ATTEMPTS) {
2213 pinstance->ioa_reset_attempts = 0;
2214 pmcraid_err("IOA didn't respond marking it as dead\n");
2215 pinstance->ioa_state = IOA_STATE_DEAD;
2216
2217 if (pinstance->ioa_bringdown)
2218 pmcraid_notify_ioastate(pinstance,
2219 PMC_DEVICE_EVENT_SHUTDOWN_FAILED);
2220 else
2221 pmcraid_notify_ioastate(pinstance,
2222 PMC_DEVICE_EVENT_RESET_FAILED);
2223 reset_complete = 1;
2224 break;
2225 }
2226
2227 /* Once either bist or pci reset is done, restore PCI config
2228 * space. If this fails, proceed with hard reset again
2229 */
2230 pci_restore_state(pinstance->pdev);
2231
2232 /* fail all pending commands */
2233 pmcraid_fail_outstanding_cmds(pinstance);
2234
2235 /* check if unit check is active, if so extract dump */
2236 if (pinstance->ioa_unit_check) {
2237 pmcraid_info("unit check is active\n");
2238 pinstance->ioa_unit_check = 0;
2239 pmcraid_get_dump(pinstance);
2240 pinstance->ioa_reset_attempts--;
2241 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2242 pmcraid_reset_alert(cmd);
2243 break;
2244 }
2245
2246 /* if the reset reason is to bring-down the ioa, we might be
2247 * done with the reset restore pci_config_space and complete
2248 * the reset
2249 */
2250 if (pinstance->ioa_bringdown) {
2251 pmcraid_info("bringing down the adapter\n");
2252 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2253 pinstance->ioa_bringdown = 0;
2254 pinstance->ioa_state = IOA_STATE_UNKNOWN;
2255 pmcraid_notify_ioastate(pinstance,
2256 PMC_DEVICE_EVENT_SHUTDOWN_SUCCESS);
2257 reset_complete = 1;
2258 } else {
2259 /* bring-up IOA, so proceed with soft reset
2260 * Reinitialize hrrq_buffers and their indices also
2261 * enable interrupts after a pci_restore_state
2262 */
2263 if (pmcraid_reset_enable_ioa(pinstance)) {
2264 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2265 pmcraid_info("bringing up the adapter\n");
2266 pmcraid_reinit_cmdblk(cmd);
2267 pmcraid_identify_hrrq(cmd);
2268 } else {
2269 pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
2270 pmcraid_soft_reset(cmd);
2271 }
2272 }
2273 break;
2274
2275 case IOA_STATE_IN_SOFT_RESET:
2276 /* TRANSITION TO OPERATIONAL is on so start initialization
2277 * sequence
2278 */
2279 pmcraid_info("In softreset proceeding with bring-up\n");
2280 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2281
2282 /* Initialization commands start with HRRQ identification. From
2283 * now on tasklet completes most of the commands as IOA is up
2284 * and intrs are enabled
2285 */
2286 pmcraid_identify_hrrq(cmd);
2287 break;
2288
2289 case IOA_STATE_IN_BRINGUP:
2290 /* we are done with bringing up of IOA, change the ioa_state to
2291 * operational and wake up any waiters
2292 */
2293 pinstance->ioa_state = IOA_STATE_OPERATIONAL;
2294 reset_complete = 1;
2295 break;
2296
2297 case IOA_STATE_OPERATIONAL:
2298 default:
2299 /* When IOA is operational and a reset is requested, check for
2300 * the reset reason. If reset is to bring down IOA, unregister
2301 * HCAMs and initiate shutdown; if adapter reset is forced then
2302 * restart reset sequence again
2303 */
2304 if (pinstance->ioa_shutdown_type == SHUTDOWN_NONE &&
2305 pinstance->force_ioa_reset == 0) {
2306 pmcraid_notify_ioastate(pinstance,
2307 PMC_DEVICE_EVENT_RESET_SUCCESS);
2308 reset_complete = 1;
2309 } else {
2310 if (pinstance->ioa_shutdown_type != SHUTDOWN_NONE)
2311 pinstance->ioa_state = IOA_STATE_IN_BRINGDOWN;
2312 pmcraid_reinit_cmdblk(cmd);
2313 pmcraid_unregister_hcams(cmd);
2314 }
2315 break;
2316 }
2317
2318 /* reset will be completed if ioa_state is either DEAD or UNKNOWN or
2319 * OPERATIONAL. Reset all control variables used during reset, wake up
2320 * any waiting threads and let the SCSI mid-layer send commands. Note
2321 * that host_lock must be held before invoking scsi_report_bus_reset.
2322 */
2323 if (reset_complete) {
2324 pinstance->ioa_reset_in_progress = 0;
2325 pinstance->ioa_reset_attempts = 0;
2326 pinstance->reset_cmd = NULL;
2327 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2328 pinstance->ioa_bringdown = 0;
2329 pmcraid_return_cmd(cmd);
2330
2331 /* If target state is to bring up the adapter, proceed with
2332 * hcam registration and resource exposure to mid-layer.
2333 */
2334 if (pinstance->ioa_state == IOA_STATE_OPERATIONAL)
2335 pmcraid_register_hcams(pinstance);
2336
2337 wake_up_all(&pinstance->reset_wait_q);
2338 }
2339
2340 return;
2341}
2342
2343/**
2344 * pmcraid_initiate_reset - initiates reset sequence. This is called from
2345 * ISR/tasklet during error interrupts including IOA unit check. If reset
2346 * is already in progress, it just returns, otherwise initiates IOA reset
2347 * to bring IOA up to operational state.
2348 *
2349 * @pinstance: pointer to adapter instance structure
2350 *
2351 * Return value
2352 * none
2353 */
2354static void pmcraid_initiate_reset(struct pmcraid_instance *pinstance)
2355{
2356 struct pmcraid_cmd *cmd;
2357
2358 /* If the reset is already in progress, just return, otherwise start
2359 * reset sequence and return
2360 */
2361 if (!pinstance->ioa_reset_in_progress) {
2362 scsi_block_requests(pinstance->host);
2363 cmd = pmcraid_get_free_cmd(pinstance);
2364
2365 if (cmd == NULL) {
2366 pmcraid_err("no cmnd blocks for initiate_reset\n");
2367 return;
2368 }
2369
2370 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2371 pinstance->reset_cmd = cmd;
2372 pinstance->force_ioa_reset = 1;
2373 pmcraid_notify_ioastate(pinstance,
2374 PMC_DEVICE_EVENT_RESET_START);
2375 pmcraid_ioa_reset(cmd);
2376 }
2377}
2378
2379/**
2380 * pmcraid_reset_reload - utility routine for doing IOA reset either to bringup
2381 * or bringdown IOA
2382 * @pinstance: pointer adapter instance structure
2383 * @shutdown_type: shutdown type to be used NONE, NORMAL or ABRREV
2384 * @target_state: expected target state after reset
2385 *
2386 * Note: This command initiates reset and waits for its completion. Hence this
2387 * should not be called from isr/timer/tasklet functions (timeout handlers,
2388 * error response handlers and interrupt handlers).
2389 *
2390 * Return Value
2391 * 1 in case ioa_state is not target_state, 0 otherwise.
2392 */
2393static int pmcraid_reset_reload(
2394 struct pmcraid_instance *pinstance,
2395 u8 shutdown_type,
2396 u8 target_state
2397)
2398{
2399 struct pmcraid_cmd *reset_cmd = NULL;
2400 unsigned long lock_flags;
2401 int reset = 1;
2402
2403 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2404
2405 if (pinstance->ioa_reset_in_progress) {
2406 pmcraid_info("reset_reload: reset is already in progress\n");
2407
2408 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2409
2410 wait_event(pinstance->reset_wait_q,
2411 !pinstance->ioa_reset_in_progress);
2412
2413 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2414
2415 if (pinstance->ioa_state == IOA_STATE_DEAD) {
2416 spin_unlock_irqrestore(pinstance->host->host_lock,
2417 lock_flags);
2418 pmcraid_info("reset_reload: IOA is dead\n");
2419 return reset;
2420 } else if (pinstance->ioa_state == target_state) {
2421 reset = 0;
2422 }
2423 }
2424
2425 if (reset) {
2426 pmcraid_info("reset_reload: proceeding with reset\n");
2427 scsi_block_requests(pinstance->host);
2428 reset_cmd = pmcraid_get_free_cmd(pinstance);
2429
2430 if (reset_cmd == NULL) {
2431 pmcraid_err("no free cmnd for reset_reload\n");
2432 spin_unlock_irqrestore(pinstance->host->host_lock,
2433 lock_flags);
2434 return reset;
2435 }
2436
2437 if (shutdown_type == SHUTDOWN_NORMAL)
2438 pinstance->ioa_bringdown = 1;
2439
2440 pinstance->ioa_shutdown_type = shutdown_type;
2441 pinstance->reset_cmd = reset_cmd;
2442 pinstance->force_ioa_reset = reset;
2443 pmcraid_info("reset_reload: initiating reset\n");
2444 pmcraid_ioa_reset(reset_cmd);
2445 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2446 pmcraid_info("reset_reload: waiting for reset to complete\n");
2447 wait_event(pinstance->reset_wait_q,
2448 !pinstance->ioa_reset_in_progress);
2449
2450 pmcraid_info("reset_reload: reset is complete !!\n");
2451 scsi_unblock_requests(pinstance->host);
2452 if (pinstance->ioa_state == target_state)
2453 reset = 0;
2454 }
2455
2456 return reset;
2457}
2458
2459/**
2460 * pmcraid_reset_bringdown - wrapper over pmcraid_reset_reload to bringdown IOA
2461 *
2462 * @pinstance: pointer to adapter instance structure
2463 *
2464 * Return Value
2465 * whatever is returned from pmcraid_reset_reload
2466 */
2467static int pmcraid_reset_bringdown(struct pmcraid_instance *pinstance)
2468{
2469 return pmcraid_reset_reload(pinstance,
2470 SHUTDOWN_NORMAL,
2471 IOA_STATE_UNKNOWN);
2472}
2473
2474/**
2475 * pmcraid_reset_bringup - wrapper over pmcraid_reset_reload to bring up IOA
2476 *
2477 * @pinstance: pointer to adapter instance structure
2478 *
2479 * Return Value
2480 * whatever is returned from pmcraid_reset_reload
2481 */
2482static int pmcraid_reset_bringup(struct pmcraid_instance *pinstance)
2483{
2484 pmcraid_notify_ioastate(pinstance, PMC_DEVICE_EVENT_RESET_START);
2485
2486 return pmcraid_reset_reload(pinstance,
2487 SHUTDOWN_NONE,
2488 IOA_STATE_OPERATIONAL);
2489}
2490
2491/**
2492 * pmcraid_request_sense - Send request sense to a device
2493 * @cmd: pmcraid command struct
2494 *
2495 * This function sends a request sense to a device as a result of a check
2496 * condition. This method re-uses the same command block that failed earlier.
2497 */
2498static void pmcraid_request_sense(struct pmcraid_cmd *cmd)
2499{
2500 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
2501 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
2502
2503 /* allocate DMAable memory for sense buffers */
2504 cmd->sense_buffer = pci_alloc_consistent(cmd->drv_inst->pdev,
2505 SCSI_SENSE_BUFFERSIZE,
2506 &cmd->sense_buffer_dma);
2507
2508 if (cmd->sense_buffer == NULL) {
2509 pmcraid_err
2510 ("couldn't allocate sense buffer for request sense\n");
2511 pmcraid_erp_done(cmd);
2512 return;
2513 }
2514
2515 /* re-use the command block */
2516 memset(&cmd->ioa_cb->ioasa, 0, sizeof(struct pmcraid_ioasa));
2517 memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
2518 ioarcb->request_flags0 = (SYNC_COMPLETE |
2519 NO_LINK_DESCS |
2520 INHIBIT_UL_CHECK);
2521 ioarcb->request_type = REQ_TYPE_SCSI;
2522 ioarcb->cdb[0] = REQUEST_SENSE;
2523 ioarcb->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2524
2525 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
2526 offsetof(struct pmcraid_ioarcb,
2527 add_data.u.ioadl[0]));
2528 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
2529
2530 ioarcb->data_transfer_length = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
2531
2532 ioadl->address = cpu_to_le64(cmd->sense_buffer_dma);
2533 ioadl->data_len = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
2534 ioadl->flags = IOADL_FLAGS_LAST_DESC;
2535
2536 /* request sense might be called as part of error response processing
2537 * which runs in tasklets context. It is possible that mid-layer might
2538 * schedule queuecommand during this time, hence, writting to IOARRIN
2539 * must be protect by host_lock
2540 */
2541 pmcraid_send_cmd(cmd, pmcraid_erp_done,
2542 PMCRAID_REQUEST_SENSE_TIMEOUT,
2543 pmcraid_timeout_handler);
2544}
2545
2546/**
2547 * pmcraid_cancel_all - cancel all outstanding IOARCBs as part of error recovery
2548 * @cmd: command that failed
2549 * @sense: true if request_sense is required after cancel all
2550 *
2551 * This function sends a cancel all to a device to clear the queue.
2552 */
2553static void pmcraid_cancel_all(struct pmcraid_cmd *cmd, u32 sense)
2554{
2555 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2556 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
2557 struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
2558 void (*cmd_done) (struct pmcraid_cmd *) = sense ? pmcraid_erp_done
2559 : pmcraid_request_sense;
2560
2561 memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
2562 ioarcb->request_flags0 = SYNC_OVERRIDE;
2563 ioarcb->request_type = REQ_TYPE_IOACMD;
2564 ioarcb->cdb[0] = PMCRAID_CANCEL_ALL_REQUESTS;
2565
2566 if (RES_IS_GSCSI(res->cfg_entry))
2567 ioarcb->cdb[1] = PMCRAID_SYNC_COMPLETE_AFTER_CANCEL;
2568
2569 ioarcb->ioadl_bus_addr = 0;
2570 ioarcb->ioadl_length = 0;
2571 ioarcb->data_transfer_length = 0;
2572 ioarcb->ioarcb_bus_addr &= (~0x1FULL);
2573
2574 /* writing to IOARRIN must be protected by host_lock, as mid-layer
2575 * schedule queuecommand while we are doing this
2576 */
2577 pmcraid_send_cmd(cmd, cmd_done,
2578 PMCRAID_REQUEST_SENSE_TIMEOUT,
2579 pmcraid_timeout_handler);
2580}
2581
2582/**
2583 * pmcraid_frame_auto_sense: frame fixed format sense information
2584 *
2585 * @cmd: pointer to failing command block
2586 *
2587 * Return value
2588 * none
2589 */
2590static void pmcraid_frame_auto_sense(struct pmcraid_cmd *cmd)
2591{
2592 u8 *sense_buf = cmd->scsi_cmd->sense_buffer;
2593 struct pmcraid_resource_entry *res = cmd->scsi_cmd->device->hostdata;
2594 struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
2595 u32 ioasc = le32_to_cpu(ioasa->ioasc);
2596 u32 failing_lba = 0;
2597
2598 memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
2599 cmd->scsi_cmd->result = SAM_STAT_CHECK_CONDITION;
2600
2601 if (RES_IS_VSET(res->cfg_entry) &&
2602 ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC &&
2603 ioasa->u.vset.failing_lba_hi != 0) {
2604
2605 sense_buf[0] = 0x72;
2606 sense_buf[1] = PMCRAID_IOASC_SENSE_KEY(ioasc);
2607 sense_buf[2] = PMCRAID_IOASC_SENSE_CODE(ioasc);
2608 sense_buf[3] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
2609
2610 sense_buf[7] = 12;
2611 sense_buf[8] = 0;
2612 sense_buf[9] = 0x0A;
2613 sense_buf[10] = 0x80;
2614
2615 failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_hi);
2616
2617 sense_buf[12] = (failing_lba & 0xff000000) >> 24;
2618 sense_buf[13] = (failing_lba & 0x00ff0000) >> 16;
2619 sense_buf[14] = (failing_lba & 0x0000ff00) >> 8;
2620 sense_buf[15] = failing_lba & 0x000000ff;
2621
2622 failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_lo);
2623
2624 sense_buf[16] = (failing_lba & 0xff000000) >> 24;
2625 sense_buf[17] = (failing_lba & 0x00ff0000) >> 16;
2626 sense_buf[18] = (failing_lba & 0x0000ff00) >> 8;
2627 sense_buf[19] = failing_lba & 0x000000ff;
2628 } else {
2629 sense_buf[0] = 0x70;
2630 sense_buf[2] = PMCRAID_IOASC_SENSE_KEY(ioasc);
2631 sense_buf[12] = PMCRAID_IOASC_SENSE_CODE(ioasc);
2632 sense_buf[13] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
2633
2634 if (ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC) {
2635 if (RES_IS_VSET(res->cfg_entry))
2636 failing_lba =
2637 le32_to_cpu(ioasa->u.
2638 vset.failing_lba_lo);
2639 sense_buf[0] |= 0x80;
2640 sense_buf[3] = (failing_lba >> 24) & 0xff;
2641 sense_buf[4] = (failing_lba >> 16) & 0xff;
2642 sense_buf[5] = (failing_lba >> 8) & 0xff;
2643 sense_buf[6] = failing_lba & 0xff;
2644 }
2645
2646 sense_buf[7] = 6; /* additional length */
2647 }
2648}
2649
2650/**
2651 * pmcraid_error_handler - Error response handlers for a SCSI op
2652 * @cmd: pointer to pmcraid_cmd that has failed
2653 *
2654 * This function determines whether or not to initiate ERP on the affected
2655 * device. This is called from a tasklet, which doesn't hold any locks.
2656 *
2657 * Return value:
2658 * 0 it caller can complete the request, otherwise 1 where in error
2659 * handler itself completes the request and returns the command block
2660 * back to free-pool
2661 */
2662static int pmcraid_error_handler(struct pmcraid_cmd *cmd)
2663{
2664 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2665 struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
2666 struct pmcraid_instance *pinstance = cmd->drv_inst;
2667 struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
2668 u32 ioasc = le32_to_cpu(ioasa->ioasc);
2669 u32 masked_ioasc = ioasc & PMCRAID_IOASC_SENSE_MASK;
2670 u32 sense_copied = 0;
2671
2672 if (!res) {
2673 pmcraid_info("resource pointer is NULL\n");
2674 return 0;
2675 }
2676
2677 /* If this was a SCSI read/write command keep count of errors */
2678 if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_READ_CMD)
2679 atomic_inc(&res->read_failures);
2680 else if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_WRITE_CMD)
2681 atomic_inc(&res->write_failures);
2682
2683 if (!RES_IS_GSCSI(res->cfg_entry) &&
2684 masked_ioasc != PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR) {
2685 pmcraid_frame_auto_sense(cmd);
2686 }
2687
2688 /* Log IOASC/IOASA information based on user settings */
2689 pmcraid_ioasc_logger(ioasc, cmd);
2690
2691 switch (masked_ioasc) {
2692
2693 case PMCRAID_IOASC_AC_TERMINATED_BY_HOST:
2694 scsi_cmd->result |= (DID_ABORT << 16);
2695 break;
2696
2697 case PMCRAID_IOASC_IR_INVALID_RESOURCE_HANDLE:
2698 case PMCRAID_IOASC_HW_CANNOT_COMMUNICATE:
2699 scsi_cmd->result |= (DID_NO_CONNECT << 16);
2700 break;
2701
2702 case PMCRAID_IOASC_NR_SYNC_REQUIRED:
2703 res->sync_reqd = 1;
2704 scsi_cmd->result |= (DID_IMM_RETRY << 16);
2705 break;
2706
2707 case PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC:
2708 scsi_cmd->result |= (DID_PASSTHROUGH << 16);
2709 break;
2710
2711 case PMCRAID_IOASC_UA_BUS_WAS_RESET:
2712 case PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER:
2713 if (!res->reset_progress)
2714 scsi_report_bus_reset(pinstance->host,
2715 scsi_cmd->device->channel);
2716 scsi_cmd->result |= (DID_ERROR << 16);
2717 break;
2718
2719 case PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR:
2720 scsi_cmd->result |= PMCRAID_IOASC_SENSE_STATUS(ioasc);
2721 res->sync_reqd = 1;
2722
2723 /* if check_condition is not active return with error otherwise
2724 * get/frame the sense buffer
2725 */
2726 if (PMCRAID_IOASC_SENSE_STATUS(ioasc) !=
2727 SAM_STAT_CHECK_CONDITION &&
2728 PMCRAID_IOASC_SENSE_STATUS(ioasc) != SAM_STAT_ACA_ACTIVE)
2729 return 0;
2730
2731 /* If we have auto sense data as part of IOASA pass it to
2732 * mid-layer
2733 */
2734 if (ioasa->auto_sense_length != 0) {
2735 short sense_len = ioasa->auto_sense_length;
2736 int data_size = min_t(u16, le16_to_cpu(sense_len),
2737 SCSI_SENSE_BUFFERSIZE);
2738
2739 memcpy(scsi_cmd->sense_buffer,
2740 ioasa->sense_data,
2741 data_size);
2742 sense_copied = 1;
2743 }
2744
2745 if (RES_IS_GSCSI(res->cfg_entry))
2746 pmcraid_cancel_all(cmd, sense_copied);
2747 else if (sense_copied)
2748 pmcraid_erp_done(cmd);
2749 else
2750 pmcraid_request_sense(cmd);
2751
2752 return 1;
2753
2754 case PMCRAID_IOASC_NR_INIT_CMD_REQUIRED:
2755 break;
2756
2757 default:
2758 if (PMCRAID_IOASC_SENSE_KEY(ioasc) > RECOVERED_ERROR)
2759 scsi_cmd->result |= (DID_ERROR << 16);
2760 break;
2761 }
2762 return 0;
2763}
2764
2765/**
2766 * pmcraid_reset_device - device reset handler functions
2767 *
2768 * @scsi_cmd: scsi command struct
2769 * @modifier: reset modifier indicating the reset sequence to be performed
2770 *
2771 * This function issues a device reset to the affected device.
2772 * A LUN reset will be sent to the device first. If that does
2773 * not work, a target reset will be sent.
2774 *
2775 * Return value:
2776 * SUCCESS / FAILED
2777 */
2778static int pmcraid_reset_device(
2779 struct scsi_cmnd *scsi_cmd,
2780 unsigned long timeout,
2781 u8 modifier
2782)
2783{
2784 struct pmcraid_cmd *cmd;
2785 struct pmcraid_instance *pinstance;
2786 struct pmcraid_resource_entry *res;
2787 struct pmcraid_ioarcb *ioarcb;
2788 unsigned long lock_flags;
2789 u32 ioasc;
2790
2791 pinstance =
2792 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
2793 res = scsi_cmd->device->hostdata;
2794
2795 if (!res) {
2796 sdev_printk(KERN_ERR, scsi_cmd->device,
2797 "reset_device: NULL resource pointer\n");
2798 return FAILED;
2799 }
2800
2801 /* If adapter is currently going through reset/reload, return failed.
2802 * This will force the mid-layer to call _eh_bus/host reset, which
2803 * will then go to sleep and wait for the reset to complete
2804 */
2805 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2806 if (pinstance->ioa_reset_in_progress ||
2807 pinstance->ioa_state == IOA_STATE_DEAD) {
2808 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2809 return FAILED;
2810 }
2811
2812 res->reset_progress = 1;
2813 pmcraid_info("Resetting %s resource with addr %x\n",
2814 ((modifier & RESET_DEVICE_LUN) ? "LUN" :
2815 ((modifier & RESET_DEVICE_TARGET) ? "TARGET" : "BUS")),
2816 le32_to_cpu(res->cfg_entry.resource_address));
2817
2818 /* get a free cmd block */
2819 cmd = pmcraid_get_free_cmd(pinstance);
2820
2821 if (cmd == NULL) {
2822 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2823 pmcraid_err("%s: no cmd blocks are available\n", __func__);
2824 return FAILED;
2825 }
2826
2827 ioarcb = &cmd->ioa_cb->ioarcb;
2828 ioarcb->resource_handle = res->cfg_entry.resource_handle;
2829 ioarcb->request_type = REQ_TYPE_IOACMD;
2830 ioarcb->cdb[0] = PMCRAID_RESET_DEVICE;
2831
2832 /* Initialize reset modifier bits */
2833 if (modifier)
2834 modifier = ENABLE_RESET_MODIFIER | modifier;
2835
2836 ioarcb->cdb[1] = modifier;
2837
2838 init_completion(&cmd->wait_for_completion);
2839 cmd->completion_req = 1;
2840
2841 pmcraid_info("cmd(CDB[0] = %x) for %x with index = %d\n",
2842 cmd->ioa_cb->ioarcb.cdb[0],
2843 le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle),
2844 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2);
2845
2846 pmcraid_send_cmd(cmd,
2847 pmcraid_internal_done,
2848 timeout,
2849 pmcraid_timeout_handler);
2850
2851 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2852
2853 /* RESET_DEVICE command completes after all pending IOARCBs are
2854 * completed. Once this command is completed, pmcraind_internal_done
2855 * will wake up the 'completion' queue.
2856 */
2857 wait_for_completion(&cmd->wait_for_completion);
2858
2859 /* complete the command here itself and return the command block
2860 * to free list
2861 */
2862 pmcraid_return_cmd(cmd);
2863 res->reset_progress = 0;
2864 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
2865
2866 /* set the return value based on the returned ioasc */
2867 return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
2868}
2869
2870/**
2871 * _pmcraid_io_done - helper for pmcraid_io_done function
2872 *
2873 * @cmd: pointer to pmcraid command struct
2874 * @reslen: residual data length to be set in the ioasa
2875 * @ioasc: ioasc either returned by IOA or set by driver itself.
2876 *
2877 * This function is invoked by pmcraid_io_done to complete mid-layer
2878 * scsi ops.
2879 *
2880 * Return value:
2881 * 0 if caller is required to return it to free_pool. Returns 1 if
2882 * caller need not worry about freeing command block as error handler
2883 * will take care of that.
2884 */
2885
2886static int _pmcraid_io_done(struct pmcraid_cmd *cmd, int reslen, int ioasc)
2887{
2888 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2889 int rc = 0;
2890
2891 scsi_set_resid(scsi_cmd, reslen);
2892
2893 pmcraid_info("response(%d) CDB[0] = %x ioasc:result: %x:%x\n",
2894 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
2895 cmd->ioa_cb->ioarcb.cdb[0],
2896 ioasc, scsi_cmd->result);
2897
2898 if (PMCRAID_IOASC_SENSE_KEY(ioasc) != 0)
2899 rc = pmcraid_error_handler(cmd);
2900
2901 if (rc == 0) {
2902 scsi_dma_unmap(scsi_cmd);
2903 scsi_cmd->scsi_done(scsi_cmd);
2904 }
2905
2906 return rc;
2907}
2908
2909/**
2910 * pmcraid_io_done - SCSI completion function
2911 *
2912 * @cmd: pointer to pmcraid command struct
2913 *
2914 * This function is invoked by tasklet/mid-layer error handler to completing
2915 * the SCSI ops sent from mid-layer.
2916 *
2917 * Return value
2918 * none
2919 */
2920
2921static void pmcraid_io_done(struct pmcraid_cmd *cmd)
2922{
2923 u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
2924 u32 reslen = le32_to_cpu(cmd->ioa_cb->ioasa.residual_data_length);
2925
2926 if (_pmcraid_io_done(cmd, reslen, ioasc) == 0)
2927 pmcraid_return_cmd(cmd);
2928}
2929
2930/**
2931 * pmcraid_abort_cmd - Aborts a single IOARCB already submitted to IOA
2932 *
2933 * @cmd: command block of the command to be aborted
2934 *
2935 * Return Value:
2936 * returns pointer to command structure used as cancelling cmd
2937 */
2938static struct pmcraid_cmd *pmcraid_abort_cmd(struct pmcraid_cmd *cmd)
2939{
2940 struct pmcraid_cmd *cancel_cmd;
2941 struct pmcraid_instance *pinstance;
2942 struct pmcraid_resource_entry *res;
2943
2944 pinstance = (struct pmcraid_instance *)cmd->drv_inst;
2945 res = cmd->scsi_cmd->device->hostdata;
2946
2947 cancel_cmd = pmcraid_get_free_cmd(pinstance);
2948
2949 if (cancel_cmd == NULL) {
2950 pmcraid_err("%s: no cmd blocks are available\n", __func__);
2951 return NULL;
2952 }
2953
2954 pmcraid_prepare_cancel_cmd(cancel_cmd, cmd);
2955
2956 pmcraid_info("aborting command CDB[0]= %x with index = %d\n",
2957 cmd->ioa_cb->ioarcb.cdb[0],
2958 cmd->ioa_cb->ioarcb.response_handle >> 2);
2959
2960 init_completion(&cancel_cmd->wait_for_completion);
2961 cancel_cmd->completion_req = 1;
2962
2963 pmcraid_info("command (%d) CDB[0] = %x for %x\n",
2964 le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.response_handle) >> 2,
2965 cancel_cmd->ioa_cb->ioarcb.cdb[0],
2966 le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.resource_handle));
2967
2968 pmcraid_send_cmd(cancel_cmd,
2969 pmcraid_internal_done,
2970 PMCRAID_INTERNAL_TIMEOUT,
2971 pmcraid_timeout_handler);
2972 return cancel_cmd;
2973}
2974
2975/**
2976 * pmcraid_abort_complete - Waits for ABORT TASK completion
2977 *
2978 * @cancel_cmd: command block use as cancelling command
2979 *
2980 * Return Value:
2981 * returns SUCCESS if ABORT TASK has good completion
2982 * otherwise FAILED
2983 */
2984static int pmcraid_abort_complete(struct pmcraid_cmd *cancel_cmd)
2985{
2986 struct pmcraid_resource_entry *res;
2987 u32 ioasc;
2988
2989 wait_for_completion(&cancel_cmd->wait_for_completion);
2990 res = cancel_cmd->res;
2991 cancel_cmd->res = NULL;
2992 ioasc = le32_to_cpu(cancel_cmd->ioa_cb->ioasa.ioasc);
2993
2994 /* If the abort task is not timed out we will get a Good completion
2995 * as sense_key, otherwise we may get one the following responses
2996 * due to subsequent bus reset or device reset. In case IOASC is
2997 * NR_SYNC_REQUIRED, set sync_reqd flag for the corresponding resource
2998 */
2999 if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
3000 ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED) {
3001 if (ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED)
3002 res->sync_reqd = 1;
3003 ioasc = 0;
3004 }
3005
3006 /* complete the command here itself */
3007 pmcraid_return_cmd(cancel_cmd);
3008 return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
3009}
3010
3011/**
3012 * pmcraid_eh_abort_handler - entry point for aborting a single task on errors
3013 *
3014 * @scsi_cmd: scsi command struct given by mid-layer. When this is called
3015 * mid-layer ensures that no other commands are queued. This
3016 * never gets called under interrupt, but a separate eh thread.
3017 *
3018 * Return value:
3019 * SUCCESS / FAILED
3020 */
3021static int pmcraid_eh_abort_handler(struct scsi_cmnd *scsi_cmd)
3022{
3023 struct pmcraid_instance *pinstance;
3024 struct pmcraid_cmd *cmd;
3025 struct pmcraid_resource_entry *res;
3026 unsigned long host_lock_flags;
3027 unsigned long pending_lock_flags;
3028 struct pmcraid_cmd *cancel_cmd = NULL;
3029 int cmd_found = 0;
3030 int rc = FAILED;
3031
3032 pinstance =
3033 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
3034
3035 scmd_printk(KERN_INFO, scsi_cmd,
3036 "I/O command timed out, aborting it.\n");
3037
3038 res = scsi_cmd->device->hostdata;
3039
3040 if (res == NULL)
3041 return rc;
3042
3043 /* If we are currently going through reset/reload, return failed.
3044 * This will force the mid-layer to eventually call
3045 * pmcraid_eh_host_reset which will then go to sleep and wait for the
3046 * reset to complete
3047 */
3048 spin_lock_irqsave(pinstance->host->host_lock, host_lock_flags);
3049
3050 if (pinstance->ioa_reset_in_progress ||
3051 pinstance->ioa_state == IOA_STATE_DEAD) {
3052 spin_unlock_irqrestore(pinstance->host->host_lock,
3053 host_lock_flags);
3054 return rc;
3055 }
3056
3057 /* loop over pending cmd list to find cmd corresponding to this
3058 * scsi_cmd. Note that this command might not have been completed
3059 * already. locking: all pending commands are protected with
3060 * pending_pool_lock.
3061 */
3062 spin_lock_irqsave(&pinstance->pending_pool_lock, pending_lock_flags);
3063 list_for_each_entry(cmd, &pinstance->pending_cmd_pool, free_list) {
3064
3065 if (cmd->scsi_cmd == scsi_cmd) {
3066 cmd_found = 1;
3067 break;
3068 }
3069 }
3070
3071 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
3072 pending_lock_flags);
3073
3074 /* If the command to be aborted was given to IOA and still pending with
3075 * it, send ABORT_TASK to abort this and wait for its completion
3076 */
3077 if (cmd_found)
3078 cancel_cmd = pmcraid_abort_cmd(cmd);
3079
3080 spin_unlock_irqrestore(pinstance->host->host_lock,
3081 host_lock_flags);
3082
3083 if (cancel_cmd) {
3084 cancel_cmd->res = cmd->scsi_cmd->device->hostdata;
3085 rc = pmcraid_abort_complete(cancel_cmd);
3086 }
3087
3088 return cmd_found ? rc : SUCCESS;
3089}
3090
3091/**
3092 * pmcraid_eh_xxxx_reset_handler - bus/target/device reset handler callbacks
3093 *
3094 * @scmd: pointer to scsi_cmd that was sent to the resource to be reset.
3095 *
3096 * All these routines invokve pmcraid_reset_device with appropriate parameters.
3097 * Since these are called from mid-layer EH thread, no other IO will be queued
3098 * to the resource being reset. However, control path (IOCTL) may be active so
3099 * it is necessary to synchronize IOARRIN writes which pmcraid_reset_device
3100 * takes care by locking/unlocking host_lock.
3101 *
3102 * Return value
3103 * SUCCESS or FAILED
3104 */
3105static int pmcraid_eh_device_reset_handler(struct scsi_cmnd *scmd)
3106{
3107 scmd_printk(KERN_INFO, scmd,
3108 "resetting device due to an I/O command timeout.\n");
3109 return pmcraid_reset_device(scmd,
3110 PMCRAID_INTERNAL_TIMEOUT,
3111 RESET_DEVICE_LUN);
3112}
3113
3114static int pmcraid_eh_bus_reset_handler(struct scsi_cmnd *scmd)
3115{
3116 scmd_printk(KERN_INFO, scmd,
3117 "Doing bus reset due to an I/O command timeout.\n");
3118 return pmcraid_reset_device(scmd,
3119 PMCRAID_RESET_BUS_TIMEOUT,
3120 RESET_DEVICE_BUS);
3121}
3122
3123static int pmcraid_eh_target_reset_handler(struct scsi_cmnd *scmd)
3124{
3125 scmd_printk(KERN_INFO, scmd,
3126 "Doing target reset due to an I/O command timeout.\n");
3127 return pmcraid_reset_device(scmd,
3128 PMCRAID_INTERNAL_TIMEOUT,
3129 RESET_DEVICE_TARGET);
3130}
3131
3132/**
3133 * pmcraid_eh_host_reset_handler - adapter reset handler callback
3134 *
3135 * @scmd: pointer to scsi_cmd that was sent to a resource of adapter
3136 *
3137 * Initiates adapter reset to bring it up to operational state
3138 *
3139 * Return value
3140 * SUCCESS or FAILED
3141 */
3142static int pmcraid_eh_host_reset_handler(struct scsi_cmnd *scmd)
3143{
3144 unsigned long interval = 10000; /* 10 seconds interval */
3145 int waits = jiffies_to_msecs(PMCRAID_RESET_HOST_TIMEOUT) / interval;
3146 struct pmcraid_instance *pinstance =
3147 (struct pmcraid_instance *)(scmd->device->host->hostdata);
3148
3149
3150 /* wait for an additional 150 seconds just in case firmware could come
3151 * up and if it could complete all the pending commands excluding the
3152 * two HCAM (CCN and LDN).
3153 */
3154 while (waits--) {
3155 if (atomic_read(&pinstance->outstanding_cmds) <=
3156 PMCRAID_MAX_HCAM_CMD)
3157 return SUCCESS;
3158 msleep(interval);
3159 }
3160
3161 dev_err(&pinstance->pdev->dev,
3162 "Adapter being reset due to an I/O command timeout.\n");
3163 return pmcraid_reset_bringup(pinstance) == 0 ? SUCCESS : FAILED;
3164}
3165
3166/**
3167 * pmcraid_task_attributes - Translate SPI Q-Tags to task attributes
3168 * @scsi_cmd: scsi command struct
3169 *
3170 * Return value
3171 * number of tags or 0 if the task is not tagged
3172 */
3173static u8 pmcraid_task_attributes(struct scsi_cmnd *scsi_cmd)
3174{
3175 char tag[2];
3176 u8 rc = 0;
3177
3178 if (scsi_populate_tag_msg(scsi_cmd, tag)) {
3179 switch (tag[0]) {
3180 case MSG_SIMPLE_TAG:
3181 rc = TASK_TAG_SIMPLE;
3182 break;
3183 case MSG_HEAD_TAG:
3184 rc = TASK_TAG_QUEUE_HEAD;
3185 break;
3186 case MSG_ORDERED_TAG:
3187 rc = TASK_TAG_ORDERED;
3188 break;
3189 };
3190 }
3191
3192 return rc;
3193}
3194
3195
3196/**
3197 * pmcraid_init_ioadls - initializes IOADL related fields in IOARCB
3198 * @cmd: pmcraid command struct
3199 * @sgcount: count of scatter-gather elements
3200 *
3201 * Return value
3202 * returns pointer pmcraid_ioadl_desc, initialized to point to internal
3203 * or external IOADLs
3204 */
3205struct pmcraid_ioadl_desc *
3206pmcraid_init_ioadls(struct pmcraid_cmd *cmd, int sgcount)
3207{
3208 struct pmcraid_ioadl_desc *ioadl;
3209 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
3210 int ioadl_count = 0;
3211
3212 if (ioarcb->add_cmd_param_length)
3213 ioadl_count = DIV_ROUND_UP(ioarcb->add_cmd_param_length, 16);
3214 ioarcb->ioadl_length =
3215 sizeof(struct pmcraid_ioadl_desc) * sgcount;
3216
3217 if ((sgcount + ioadl_count) > (ARRAY_SIZE(ioarcb->add_data.u.ioadl))) {
3218 /* external ioadls start at offset 0x80 from control_block
3219 * structure, re-using 24 out of 27 ioadls part of IOARCB.
3220 * It is necessary to indicate to firmware that driver is
3221 * using ioadls to be treated as external to IOARCB.
3222 */
3223 ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
3224 ioarcb->ioadl_bus_addr =
3225 cpu_to_le64((cmd->ioa_cb_bus_addr) +
3226 offsetof(struct pmcraid_ioarcb,
3227 add_data.u.ioadl[3]));
3228 ioadl = &ioarcb->add_data.u.ioadl[3];
3229 } else {
3230 ioarcb->ioadl_bus_addr =
3231 cpu_to_le64((cmd->ioa_cb_bus_addr) +
3232 offsetof(struct pmcraid_ioarcb,
3233 add_data.u.ioadl[ioadl_count]));
3234
3235 ioadl = &ioarcb->add_data.u.ioadl[ioadl_count];
3236 ioarcb->ioarcb_bus_addr |=
3237 DIV_ROUND_CLOSEST(sgcount + ioadl_count, 8);
3238 }
3239
3240 return ioadl;
3241}
3242
3243/**
3244 * pmcraid_build_ioadl - Build a scatter/gather list and map the buffer
3245 * @pinstance: pointer to adapter instance structure
3246 * @cmd: pmcraid command struct
3247 *
3248 * This function is invoked by queuecommand entry point while sending a command
3249 * to firmware. This builds ioadl descriptors and sets up ioarcb fields.
3250 *
3251 * Return value:
3252 * 0 on success or -1 on failure
3253 */
3254static int pmcraid_build_ioadl(
3255 struct pmcraid_instance *pinstance,
3256 struct pmcraid_cmd *cmd
3257)
3258{
3259 int i, nseg;
3260 struct scatterlist *sglist;
3261
3262 struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
3263 struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
3264 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
3265
3266 u32 length = scsi_bufflen(scsi_cmd);
3267
3268 if (!length)
3269 return 0;
3270
3271 nseg = scsi_dma_map(scsi_cmd);
3272
3273 if (nseg < 0) {
3274 scmd_printk(KERN_ERR, scsi_cmd, "scsi_map_dma failed!\n");
3275 return -1;
3276 } else if (nseg > PMCRAID_MAX_IOADLS) {
3277 scsi_dma_unmap(scsi_cmd);
3278 scmd_printk(KERN_ERR, scsi_cmd,
3279 "sg count is (%d) more than allowed!\n", nseg);
3280 return -1;
3281 }
3282
3283 /* Initialize IOARCB data transfer length fields */
3284 if (scsi_cmd->sc_data_direction == DMA_TO_DEVICE)
3285 ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
3286
3287 ioarcb->request_flags0 |= NO_LINK_DESCS;
3288 ioarcb->data_transfer_length = cpu_to_le32(length);
3289 ioadl = pmcraid_init_ioadls(cmd, nseg);
3290
3291 /* Initialize IOADL descriptor addresses */
3292 scsi_for_each_sg(scsi_cmd, sglist, nseg, i) {
3293 ioadl[i].data_len = cpu_to_le32(sg_dma_len(sglist));
3294 ioadl[i].address = cpu_to_le64(sg_dma_address(sglist));
3295 ioadl[i].flags = 0;
3296 }
3297 /* setup last descriptor */
3298 ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;
3299
3300 return 0;
3301}
3302
3303/**
3304 * pmcraid_free_sglist - Frees an allocated SG buffer list
3305 * @sglist: scatter/gather list pointer
3306 *
3307 * Free a DMA'able memory previously allocated with pmcraid_alloc_sglist
3308 *
3309 * Return value:
3310 * none
3311 */
3312static void pmcraid_free_sglist(struct pmcraid_sglist *sglist)
3313{
3314 int i;
3315
3316 for (i = 0; i < sglist->num_sg; i++)
3317 __free_pages(sg_page(&(sglist->scatterlist[i])),
3318 sglist->order);
3319
3320 kfree(sglist);
3321}
3322
3323/**
3324 * pmcraid_alloc_sglist - Allocates memory for a SG list
3325 * @buflen: buffer length
3326 *
3327 * Allocates a DMA'able buffer in chunks and assembles a scatter/gather
3328 * list.
3329 *
3330 * Return value
3331 * pointer to sglist / NULL on failure
3332 */
3333static struct pmcraid_sglist *pmcraid_alloc_sglist(int buflen)
3334{
3335 struct pmcraid_sglist *sglist;
3336 struct scatterlist *scatterlist;
3337 struct page *page;
3338 int num_elem, i, j;
3339 int sg_size;
3340 int order;
3341 int bsize_elem;
3342
3343 sg_size = buflen / (PMCRAID_MAX_IOADLS - 1);
3344 order = (sg_size > 0) ? get_order(sg_size) : 0;
3345 bsize_elem = PAGE_SIZE * (1 << order);
3346
3347 /* Determine the actual number of sg entries needed */
3348 if (buflen % bsize_elem)
3349 num_elem = (buflen / bsize_elem) + 1;
3350 else
3351 num_elem = buflen / bsize_elem;
3352
3353 /* Allocate a scatter/gather list for the DMA */
3354 sglist = kzalloc(sizeof(struct pmcraid_sglist) +
3355 (sizeof(struct scatterlist) * (num_elem - 1)),
3356 GFP_KERNEL);
3357
3358 if (sglist == NULL)
3359 return NULL;
3360
3361 scatterlist = sglist->scatterlist;
3362 sg_init_table(scatterlist, num_elem);
3363 sglist->order = order;
3364 sglist->num_sg = num_elem;
3365 sg_size = buflen;
3366
3367 for (i = 0; i < num_elem; i++) {
3368 page = alloc_pages(GFP_KERNEL|GFP_DMA|__GFP_ZERO, order);
3369 if (!page) {
3370 for (j = i - 1; j >= 0; j--)
3371 __free_pages(sg_page(&scatterlist[j]), order);
3372 kfree(sglist);
3373 return NULL;
3374 }
3375
3376 sg_set_page(&scatterlist[i], page,
3377 sg_size < bsize_elem ? sg_size : bsize_elem, 0);
3378 sg_size -= bsize_elem;
3379 }
3380
3381 return sglist;
3382}
3383
3384/**
3385 * pmcraid_copy_sglist - Copy user buffer to kernel buffer's SG list
3386 * @sglist: scatter/gather list pointer
3387 * @buffer: buffer pointer
3388 * @len: buffer length
3389 * @direction: data transfer direction
3390 *
3391 * Copy a user buffer into a buffer allocated by pmcraid_alloc_sglist
3392 *
3393 * Return value:
3394 * 0 on success / other on failure
3395 */
3396static int pmcraid_copy_sglist(
3397 struct pmcraid_sglist *sglist,
3398 unsigned long buffer,
3399 u32 len,
3400 int direction
3401)
3402{
3403 struct scatterlist *scatterlist;
3404 void *kaddr;
3405 int bsize_elem;
3406 int i;
3407 int rc = 0;
3408
3409 /* Determine the actual number of bytes per element */
3410 bsize_elem = PAGE_SIZE * (1 << sglist->order);
3411
3412 scatterlist = sglist->scatterlist;
3413
3414 for (i = 0; i < (len / bsize_elem); i++, buffer += bsize_elem) {
3415 struct page *page = sg_page(&scatterlist[i]);
3416
3417 kaddr = kmap(page);
3418 if (direction == DMA_TO_DEVICE)
3419 rc = __copy_from_user(kaddr,
3420 (void *)buffer,
3421 bsize_elem);
3422 else
3423 rc = __copy_to_user((void *)buffer, kaddr, bsize_elem);
3424
3425 kunmap(page);
3426
3427 if (rc) {
3428 pmcraid_err("failed to copy user data into sg list\n");
3429 return -EFAULT;
3430 }
3431
3432 scatterlist[i].length = bsize_elem;
3433 }
3434
3435 if (len % bsize_elem) {
3436 struct page *page = sg_page(&scatterlist[i]);
3437
3438 kaddr = kmap(page);
3439
3440 if (direction == DMA_TO_DEVICE)
3441 rc = __copy_from_user(kaddr,
3442 (void *)buffer,
3443 len % bsize_elem);
3444 else
3445 rc = __copy_to_user((void *)buffer,
3446 kaddr,
3447 len % bsize_elem);
3448
3449 kunmap(page);
3450
3451 scatterlist[i].length = len % bsize_elem;
3452 }
3453
3454 if (rc) {
3455 pmcraid_err("failed to copy user data into sg list\n");
3456 rc = -EFAULT;
3457 }
3458
3459 return rc;
3460}
3461
3462/**
3463 * pmcraid_queuecommand - Queue a mid-layer request
3464 * @scsi_cmd: scsi command struct
3465 * @done: done function
3466 *
3467 * This function queues a request generated by the mid-layer. Midlayer calls
3468 * this routine within host->lock. Some of the functions called by queuecommand
3469 * would use cmd block queue locks (free_pool_lock and pending_pool_lock)
3470 *
3471 * Return value:
3472 * 0 on success
3473 * SCSI_MLQUEUE_DEVICE_BUSY if device is busy
3474 * SCSI_MLQUEUE_HOST_BUSY if host is busy
3475 */
3476static int pmcraid_queuecommand_lck(
3477 struct scsi_cmnd *scsi_cmd,
3478 void (*done) (struct scsi_cmnd *)
3479)
3480{
3481 struct pmcraid_instance *pinstance;
3482 struct pmcraid_resource_entry *res;
3483 struct pmcraid_ioarcb *ioarcb;
3484 struct pmcraid_cmd *cmd;
3485 u32 fw_version;
3486 int rc = 0;
3487
3488 pinstance =
3489 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
3490 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
3491 scsi_cmd->scsi_done = done;
3492 res = scsi_cmd->device->hostdata;
3493 scsi_cmd->result = (DID_OK << 16);
3494
3495 /* if adapter is marked as dead, set result to DID_NO_CONNECT complete
3496 * the command
3497 */
3498 if (pinstance->ioa_state == IOA_STATE_DEAD) {
3499 pmcraid_info("IOA is dead, but queuecommand is scheduled\n");
3500 scsi_cmd->result = (DID_NO_CONNECT << 16);
3501 scsi_cmd->scsi_done(scsi_cmd);
3502 return 0;
3503 }
3504
3505 /* If IOA reset is in progress, can't queue the commands */
3506 if (pinstance->ioa_reset_in_progress)
3507 return SCSI_MLQUEUE_HOST_BUSY;
3508
3509 /* Firmware doesn't support SYNCHRONIZE_CACHE command (0x35), complete
3510 * the command here itself with success return
3511 */
3512 if (scsi_cmd->cmnd[0] == SYNCHRONIZE_CACHE) {
3513 pmcraid_info("SYNC_CACHE(0x35), completing in driver itself\n");
3514 scsi_cmd->scsi_done(scsi_cmd);
3515 return 0;
3516 }
3517
3518 /* initialize the command and IOARCB to be sent to IOA */
3519 cmd = pmcraid_get_free_cmd(pinstance);
3520
3521 if (cmd == NULL) {
3522 pmcraid_err("free command block is not available\n");
3523 return SCSI_MLQUEUE_HOST_BUSY;
3524 }
3525
3526 cmd->scsi_cmd = scsi_cmd;
3527 ioarcb = &(cmd->ioa_cb->ioarcb);
3528 memcpy(ioarcb->cdb, scsi_cmd->cmnd, scsi_cmd->cmd_len);
3529 ioarcb->resource_handle = res->cfg_entry.resource_handle;
3530 ioarcb->request_type = REQ_TYPE_SCSI;
3531
3532 /* set hrrq number where the IOA should respond to. Note that all cmds
3533 * generated internally uses hrrq_id 0, exception to this is the cmd
3534 * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
3535 * hrrq_id assigned here in queuecommand
3536 */
3537 ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
3538 pinstance->num_hrrq;
3539 cmd->cmd_done = pmcraid_io_done;
3540
3541 if (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry)) {
3542 if (scsi_cmd->underflow == 0)
3543 ioarcb->request_flags0 |= INHIBIT_UL_CHECK;
3544
3545 if (res->sync_reqd) {
3546 ioarcb->request_flags0 |= SYNC_COMPLETE;
3547 res->sync_reqd = 0;
3548 }
3549
3550 ioarcb->request_flags0 |= NO_LINK_DESCS;
3551 ioarcb->request_flags1 |= pmcraid_task_attributes(scsi_cmd);
3552
3553 if (RES_IS_GSCSI(res->cfg_entry))
3554 ioarcb->request_flags1 |= DELAY_AFTER_RESET;
3555 }
3556
3557 rc = pmcraid_build_ioadl(pinstance, cmd);
3558
3559 pmcraid_info("command (%d) CDB[0] = %x for %x:%x:%x:%x\n",
3560 le32_to_cpu(ioarcb->response_handle) >> 2,
3561 scsi_cmd->cmnd[0], pinstance->host->unique_id,
3562 RES_IS_VSET(res->cfg_entry) ? PMCRAID_VSET_BUS_ID :
3563 PMCRAID_PHYS_BUS_ID,
3564 RES_IS_VSET(res->cfg_entry) ?
3565 (fw_version <= PMCRAID_FW_VERSION_1 ?
3566 res->cfg_entry.unique_flags1 :
3567 res->cfg_entry.array_id & 0xFF) :
3568 RES_TARGET(res->cfg_entry.resource_address),
3569 RES_LUN(res->cfg_entry.resource_address));
3570
3571 if (likely(rc == 0)) {
3572 _pmcraid_fire_command(cmd);
3573 } else {
3574 pmcraid_err("queuecommand could not build ioadl\n");
3575 pmcraid_return_cmd(cmd);
3576 rc = SCSI_MLQUEUE_HOST_BUSY;
3577 }
3578
3579 return rc;
3580}
3581
3582static DEF_SCSI_QCMD(pmcraid_queuecommand)
3583
3584/**
3585 * pmcraid_open -char node "open" entry, allowed only users with admin access
3586 */
3587static int pmcraid_chr_open(struct inode *inode, struct file *filep)
3588{
3589 struct pmcraid_instance *pinstance;
3590
3591 if (!capable(CAP_SYS_ADMIN))
3592 return -EACCES;
3593
3594 /* Populate adapter instance * pointer for use by ioctl */
3595 pinstance = container_of(inode->i_cdev, struct pmcraid_instance, cdev);
3596 filep->private_data = pinstance;
3597
3598 return 0;
3599}
3600
3601/**
3602 * pmcraid_release - char node "release" entry point
3603 */
3604static int pmcraid_chr_release(struct inode *inode, struct file *filep)
3605{
3606 struct pmcraid_instance *pinstance = filep->private_data;
3607
3608 filep->private_data = NULL;
3609 fasync_helper(-1, filep, 0, &pinstance->aen_queue);
3610
3611 return 0;
3612}
3613
3614/**
3615 * pmcraid_fasync - Async notifier registration from applications
3616 *
3617 * This function adds the calling process to a driver global queue. When an
3618 * event occurs, SIGIO will be sent to all processes in this queue.
3619 */
3620static int pmcraid_chr_fasync(int fd, struct file *filep, int mode)
3621{
3622 struct pmcraid_instance *pinstance;
3623 int rc;
3624
3625 pinstance = filep->private_data;
3626 mutex_lock(&pinstance->aen_queue_lock);
3627 rc = fasync_helper(fd, filep, mode, &pinstance->aen_queue);
3628 mutex_unlock(&pinstance->aen_queue_lock);
3629
3630 return rc;
3631}
3632
3633
3634/**
3635 * pmcraid_build_passthrough_ioadls - builds SG elements for passthrough
3636 * commands sent over IOCTL interface
3637 *
3638 * @cmd : pointer to struct pmcraid_cmd
3639 * @buflen : length of the request buffer
3640 * @direction : data transfer direction
3641 *
3642 * Return value
3643 * 0 on success, non-zero error code on failure
3644 */
3645static int pmcraid_build_passthrough_ioadls(
3646 struct pmcraid_cmd *cmd,
3647 int buflen,
3648 int direction
3649)
3650{
3651 struct pmcraid_sglist *sglist = NULL;
3652 struct scatterlist *sg = NULL;
3653 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
3654 struct pmcraid_ioadl_desc *ioadl;
3655 int i;
3656
3657 sglist = pmcraid_alloc_sglist(buflen);
3658
3659 if (!sglist) {
3660 pmcraid_err("can't allocate memory for passthrough SGls\n");
3661 return -ENOMEM;
3662 }
3663
3664 sglist->num_dma_sg = pci_map_sg(cmd->drv_inst->pdev,
3665 sglist->scatterlist,
3666 sglist->num_sg, direction);
3667
3668 if (!sglist->num_dma_sg || sglist->num_dma_sg > PMCRAID_MAX_IOADLS) {
3669 dev_err(&cmd->drv_inst->pdev->dev,
3670 "Failed to map passthrough buffer!\n");
3671 pmcraid_free_sglist(sglist);
3672 return -EIO;
3673 }
3674
3675 cmd->sglist = sglist;
3676 ioarcb->request_flags0 |= NO_LINK_DESCS;
3677
3678 ioadl = pmcraid_init_ioadls(cmd, sglist->num_dma_sg);
3679
3680 /* Initialize IOADL descriptor addresses */
3681 for_each_sg(sglist->scatterlist, sg, sglist->num_dma_sg, i) {
3682 ioadl[i].data_len = cpu_to_le32(sg_dma_len(sg));
3683 ioadl[i].address = cpu_to_le64(sg_dma_address(sg));
3684 ioadl[i].flags = 0;
3685 }
3686
3687 /* setup the last descriptor */
3688 ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;
3689
3690 return 0;
3691}
3692
3693
3694/**
3695 * pmcraid_release_passthrough_ioadls - release passthrough ioadls
3696 *
3697 * @cmd: pointer to struct pmcraid_cmd for which ioadls were allocated
3698 * @buflen: size of the request buffer
3699 * @direction: data transfer direction
3700 *
3701 * Return value
3702 * 0 on success, non-zero error code on failure
3703 */
3704static void pmcraid_release_passthrough_ioadls(
3705 struct pmcraid_cmd *cmd,
3706 int buflen,
3707 int direction
3708)
3709{
3710 struct pmcraid_sglist *sglist = cmd->sglist;
3711
3712 if (buflen > 0) {
3713 pci_unmap_sg(cmd->drv_inst->pdev,
3714 sglist->scatterlist,
3715 sglist->num_sg,
3716 direction);
3717 pmcraid_free_sglist(sglist);
3718 cmd->sglist = NULL;
3719 }
3720}
3721
3722/**
3723 * pmcraid_ioctl_passthrough - handling passthrough IOCTL commands
3724 *
3725 * @pinstance: pointer to adapter instance structure
3726 * @cmd: ioctl code
3727 * @arg: pointer to pmcraid_passthrough_buffer user buffer
3728 *
3729 * Return value
3730 * 0 on success, non-zero error code on failure
3731 */
3732static long pmcraid_ioctl_passthrough(
3733 struct pmcraid_instance *pinstance,
3734 unsigned int ioctl_cmd,
3735 unsigned int buflen,
3736 unsigned long arg
3737)
3738{
3739 struct pmcraid_passthrough_ioctl_buffer *buffer;
3740 struct pmcraid_ioarcb *ioarcb;
3741 struct pmcraid_cmd *cmd;
3742 struct pmcraid_cmd *cancel_cmd;
3743 unsigned long request_buffer;
3744 unsigned long request_offset;
3745 unsigned long lock_flags;
3746 void *ioasa;
3747 u32 ioasc;
3748 int request_size;
3749 int buffer_size;
3750 u8 access, direction;
3751 int rc = 0;
3752
3753 /* If IOA reset is in progress, wait 10 secs for reset to complete */
3754 if (pinstance->ioa_reset_in_progress) {
3755 rc = wait_event_interruptible_timeout(
3756 pinstance->reset_wait_q,
3757 !pinstance->ioa_reset_in_progress,
3758 msecs_to_jiffies(10000));
3759
3760 if (!rc)
3761 return -ETIMEDOUT;
3762 else if (rc < 0)
3763 return -ERESTARTSYS;
3764 }
3765
3766 /* If adapter is not in operational state, return error */
3767 if (pinstance->ioa_state != IOA_STATE_OPERATIONAL) {
3768 pmcraid_err("IOA is not operational\n");
3769 return -ENOTTY;
3770 }
3771
3772 buffer_size = sizeof(struct pmcraid_passthrough_ioctl_buffer);
3773 buffer = kmalloc(buffer_size, GFP_KERNEL);
3774
3775 if (!buffer) {
3776 pmcraid_err("no memory for passthrough buffer\n");
3777 return -ENOMEM;
3778 }
3779
3780 request_offset =
3781 offsetof(struct pmcraid_passthrough_ioctl_buffer, request_buffer);
3782
3783 request_buffer = arg + request_offset;
3784
3785 rc = __copy_from_user(buffer,
3786 (struct pmcraid_passthrough_ioctl_buffer *) arg,
3787 sizeof(struct pmcraid_passthrough_ioctl_buffer));
3788
3789 ioasa =
3790 (void *)(arg +
3791 offsetof(struct pmcraid_passthrough_ioctl_buffer, ioasa));
3792
3793 if (rc) {
3794 pmcraid_err("ioctl: can't copy passthrough buffer\n");
3795 rc = -EFAULT;
3796 goto out_free_buffer;
3797 }
3798
3799 request_size = buffer->ioarcb.data_transfer_length;
3800
3801 if (buffer->ioarcb.request_flags0 & TRANSFER_DIR_WRITE) {
3802 access = VERIFY_READ;
3803 direction = DMA_TO_DEVICE;
3804 } else {
3805 access = VERIFY_WRITE;
3806 direction = DMA_FROM_DEVICE;
3807 }
3808
3809 if (request_size > 0) {
3810 rc = access_ok(access, arg, request_offset + request_size);
3811
3812 if (!rc) {
3813 rc = -EFAULT;
3814 goto out_free_buffer;
3815 }
3816 } else if (request_size < 0) {
3817 rc = -EINVAL;
3818 goto out_free_buffer;
3819 }
3820
3821 /* check if we have any additional command parameters */
3822 if (buffer->ioarcb.add_cmd_param_length > PMCRAID_ADD_CMD_PARAM_LEN) {
3823 rc = -EINVAL;
3824 goto out_free_buffer;
3825 }
3826
3827 cmd = pmcraid_get_free_cmd(pinstance);
3828
3829 if (!cmd) {
3830 pmcraid_err("free command block is not available\n");
3831 rc = -ENOMEM;
3832 goto out_free_buffer;
3833 }
3834
3835 cmd->scsi_cmd = NULL;
3836 ioarcb = &(cmd->ioa_cb->ioarcb);
3837
3838 /* Copy the user-provided IOARCB stuff field by field */
3839 ioarcb->resource_handle = buffer->ioarcb.resource_handle;
3840 ioarcb->data_transfer_length = buffer->ioarcb.data_transfer_length;
3841 ioarcb->cmd_timeout = buffer->ioarcb.cmd_timeout;
3842 ioarcb->request_type = buffer->ioarcb.request_type;
3843 ioarcb->request_flags0 = buffer->ioarcb.request_flags0;
3844 ioarcb->request_flags1 = buffer->ioarcb.request_flags1;
3845 memcpy(ioarcb->cdb, buffer->ioarcb.cdb, PMCRAID_MAX_CDB_LEN);
3846
3847 if (buffer->ioarcb.add_cmd_param_length) {
3848 ioarcb->add_cmd_param_length =
3849 buffer->ioarcb.add_cmd_param_length;
3850 ioarcb->add_cmd_param_offset =
3851 buffer->ioarcb.add_cmd_param_offset;
3852 memcpy(ioarcb->add_data.u.add_cmd_params,
3853 buffer->ioarcb.add_data.u.add_cmd_params,
3854 buffer->ioarcb.add_cmd_param_length);
3855 }
3856
3857 /* set hrrq number where the IOA should respond to. Note that all cmds
3858 * generated internally uses hrrq_id 0, exception to this is the cmd
3859 * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
3860 * hrrq_id assigned here in queuecommand
3861 */
3862 ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
3863 pinstance->num_hrrq;
3864
3865 if (request_size) {
3866 rc = pmcraid_build_passthrough_ioadls(cmd,
3867 request_size,
3868 direction);
3869 if (rc) {
3870 pmcraid_err("couldn't build passthrough ioadls\n");
3871 goto out_free_buffer;
3872 }
3873 } else if (request_size < 0) {
3874 rc = -EINVAL;
3875 goto out_free_buffer;
3876 }
3877
3878 /* If data is being written into the device, copy the data from user
3879 * buffers
3880 */
3881 if (direction == DMA_TO_DEVICE && request_size > 0) {
3882 rc = pmcraid_copy_sglist(cmd->sglist,
3883 request_buffer,
3884 request_size,
3885 direction);
3886 if (rc) {
3887 pmcraid_err("failed to copy user buffer\n");
3888 goto out_free_sglist;
3889 }
3890 }
3891
3892 /* passthrough ioctl is a blocking command so, put the user to sleep
3893 * until timeout. Note that a timeout value of 0 means, do timeout.
3894 */
3895 cmd->cmd_done = pmcraid_internal_done;
3896 init_completion(&cmd->wait_for_completion);
3897 cmd->completion_req = 1;
3898
3899 pmcraid_info("command(%d) (CDB[0] = %x) for %x\n",
3900 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
3901 cmd->ioa_cb->ioarcb.cdb[0],
3902 le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle));
3903
3904 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
3905 _pmcraid_fire_command(cmd);
3906 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
3907
3908 /* NOTE ! Remove the below line once abort_task is implemented
3909 * in firmware. This line disables ioctl command timeout handling logic
3910 * similar to IO command timeout handling, making ioctl commands to wait
3911 * until the command completion regardless of timeout value specified in
3912 * ioarcb
3913 */
3914 buffer->ioarcb.cmd_timeout = 0;
3915
3916 /* If command timeout is specified put caller to wait till that time,
3917 * otherwise it would be blocking wait. If command gets timed out, it
3918 * will be aborted.
3919 */
3920 if (buffer->ioarcb.cmd_timeout == 0) {
3921 wait_for_completion(&cmd->wait_for_completion);
3922 } else if (!wait_for_completion_timeout(
3923 &cmd->wait_for_completion,
3924 msecs_to_jiffies(buffer->ioarcb.cmd_timeout * 1000))) {
3925
3926 pmcraid_info("aborting cmd %d (CDB[0] = %x) due to timeout\n",
3927 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle >> 2),
3928 cmd->ioa_cb->ioarcb.cdb[0]);
3929
3930 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
3931 cancel_cmd = pmcraid_abort_cmd(cmd);
3932 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
3933
3934 if (cancel_cmd) {
3935 wait_for_completion(&cancel_cmd->wait_for_completion);
3936 ioasc = cancel_cmd->ioa_cb->ioasa.ioasc;
3937 pmcraid_return_cmd(cancel_cmd);
3938
3939 /* if abort task couldn't find the command i.e it got
3940 * completed prior to aborting, return good completion.
3941 * if command got aborted successfully or there was IOA
3942 * reset due to abort task itself getting timedout then
3943 * return -ETIMEDOUT
3944 */
3945 if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
3946 PMCRAID_IOASC_SENSE_KEY(ioasc) == 0x00) {
3947 if (ioasc != PMCRAID_IOASC_GC_IOARCB_NOTFOUND)
3948 rc = -ETIMEDOUT;
3949 goto out_handle_response;
3950 }
3951 }
3952
3953 /* no command block for abort task or abort task failed to abort
3954 * the IOARCB, then wait for 150 more seconds and initiate reset
3955 * sequence after timeout
3956 */
3957 if (!wait_for_completion_timeout(
3958 &cmd->wait_for_completion,
3959 msecs_to_jiffies(150 * 1000))) {
3960 pmcraid_reset_bringup(cmd->drv_inst);
3961 rc = -ETIMEDOUT;
3962 }
3963 }
3964
3965out_handle_response:
3966 /* copy entire IOASA buffer and return IOCTL success.
3967 * If copying IOASA to user-buffer fails, return
3968 * EFAULT
3969 */
3970 if (copy_to_user(ioasa, &cmd->ioa_cb->ioasa,
3971 sizeof(struct pmcraid_ioasa))) {
3972 pmcraid_err("failed to copy ioasa buffer to user\n");
3973 rc = -EFAULT;
3974 }
3975
3976 /* If the data transfer was from device, copy the data onto user
3977 * buffers
3978 */
3979 else if (direction == DMA_FROM_DEVICE && request_size > 0) {
3980 rc = pmcraid_copy_sglist(cmd->sglist,
3981 request_buffer,
3982 request_size,
3983 direction);
3984 if (rc) {
3985 pmcraid_err("failed to copy user buffer\n");
3986 rc = -EFAULT;
3987 }
3988 }
3989
3990out_free_sglist:
3991 pmcraid_release_passthrough_ioadls(cmd, request_size, direction);
3992 pmcraid_return_cmd(cmd);
3993
3994out_free_buffer:
3995 kfree(buffer);
3996
3997 return rc;
3998}
3999
4000
4001
4002
4003/**
4004 * pmcraid_ioctl_driver - ioctl handler for commands handled by driver itself
4005 *
4006 * @pinstance: pointer to adapter instance structure
4007 * @cmd: ioctl command passed in
4008 * @buflen: length of user_buffer
4009 * @user_buffer: user buffer pointer
4010 *
4011 * Return Value
4012 * 0 in case of success, otherwise appropriate error code
4013 */
4014static long pmcraid_ioctl_driver(
4015 struct pmcraid_instance *pinstance,
4016 unsigned int cmd,
4017 unsigned int buflen,
4018 void __user *user_buffer
4019)
4020{
4021 int rc = -ENOSYS;
4022
4023 if (!access_ok(VERIFY_READ, user_buffer, _IOC_SIZE(cmd))) {
4024 pmcraid_err("ioctl_driver: access fault in request buffer\n");
4025 return -EFAULT;
4026 }
4027
4028 switch (cmd) {
4029 case PMCRAID_IOCTL_RESET_ADAPTER:
4030 pmcraid_reset_bringup(pinstance);
4031 rc = 0;
4032 break;
4033
4034 default:
4035 break;
4036 }
4037
4038 return rc;
4039}
4040
4041/**
4042 * pmcraid_check_ioctl_buffer - check for proper access to user buffer
4043 *
4044 * @cmd: ioctl command
4045 * @arg: user buffer
4046 * @hdr: pointer to kernel memory for pmcraid_ioctl_header
4047 *
4048 * Return Value
4049 * negetive error code if there are access issues, otherwise zero.
4050 * Upon success, returns ioctl header copied out of user buffer.
4051 */
4052
4053static int pmcraid_check_ioctl_buffer(
4054 int cmd,
4055 void __user *arg,
4056 struct pmcraid_ioctl_header *hdr
4057)
4058{
4059 int rc = 0;
4060 int access = VERIFY_READ;
4061
4062 if (copy_from_user(hdr, arg, sizeof(struct pmcraid_ioctl_header))) {
4063 pmcraid_err("couldn't copy ioctl header from user buffer\n");
4064 return -EFAULT;
4065 }
4066
4067 /* check for valid driver signature */
4068 rc = memcmp(hdr->signature,
4069 PMCRAID_IOCTL_SIGNATURE,
4070 sizeof(hdr->signature));
4071 if (rc) {
4072 pmcraid_err("signature verification failed\n");
4073 return -EINVAL;
4074 }
4075
4076 /* check for appropriate buffer access */
4077 if ((_IOC_DIR(cmd) & _IOC_READ) == _IOC_READ)
4078 access = VERIFY_WRITE;
4079
4080 rc = access_ok(access,
4081 (arg + sizeof(struct pmcraid_ioctl_header)),
4082 hdr->buffer_length);
4083 if (!rc) {
4084 pmcraid_err("access failed for user buffer of size %d\n",
4085 hdr->buffer_length);
4086 return -EFAULT;
4087 }
4088
4089 return 0;
4090}
4091
4092/**
4093 * pmcraid_ioctl - char node ioctl entry point
4094 */
4095static long pmcraid_chr_ioctl(
4096 struct file *filep,
4097 unsigned int cmd,
4098 unsigned long arg
4099)
4100{
4101 struct pmcraid_instance *pinstance = NULL;
4102 struct pmcraid_ioctl_header *hdr = NULL;
4103 int retval = -ENOTTY;
4104
4105 hdr = kmalloc(sizeof(struct pmcraid_ioctl_header), GFP_KERNEL);
4106
4107 if (!hdr) {
4108 pmcraid_err("failed to allocate memory for ioctl header\n");
4109 return -ENOMEM;
4110 }
4111
4112 retval = pmcraid_check_ioctl_buffer(cmd, (void *)arg, hdr);
4113
4114 if (retval) {
4115 pmcraid_info("chr_ioctl: header check failed\n");
4116 kfree(hdr);
4117 return retval;
4118 }
4119
4120 pinstance = filep->private_data;
4121
4122 if (!pinstance) {
4123 pmcraid_info("adapter instance is not found\n");
4124 kfree(hdr);
4125 return -ENOTTY;
4126 }
4127
4128 switch (_IOC_TYPE(cmd)) {
4129
4130 case PMCRAID_PASSTHROUGH_IOCTL:
4131 /* If ioctl code is to download microcode, we need to block
4132 * mid-layer requests.
4133 */
4134 if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
4135 scsi_block_requests(pinstance->host);
4136
4137 retval = pmcraid_ioctl_passthrough(pinstance,
4138 cmd,
4139 hdr->buffer_length,
4140 arg);
4141
4142 if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
4143 scsi_unblock_requests(pinstance->host);
4144 break;
4145
4146 case PMCRAID_DRIVER_IOCTL:
4147 arg += sizeof(struct pmcraid_ioctl_header);
4148 retval = pmcraid_ioctl_driver(pinstance,
4149 cmd,
4150 hdr->buffer_length,
4151 (void __user *)arg);
4152 break;
4153
4154 default:
4155 retval = -ENOTTY;
4156 break;
4157 }
4158
4159 kfree(hdr);
4160
4161 return retval;
4162}
4163
4164/**
4165 * File operations structure for management interface
4166 */
4167static const struct file_operations pmcraid_fops = {
4168 .owner = THIS_MODULE,
4169 .open = pmcraid_chr_open,
4170 .release = pmcraid_chr_release,
4171 .fasync = pmcraid_chr_fasync,
4172 .unlocked_ioctl = pmcraid_chr_ioctl,
4173#ifdef CONFIG_COMPAT
4174 .compat_ioctl = pmcraid_chr_ioctl,
4175#endif
4176 .llseek = noop_llseek,
4177};
4178
4179
4180
4181
4182/**
4183 * pmcraid_show_log_level - Display adapter's error logging level
4184 * @dev: class device struct
4185 * @buf: buffer
4186 *
4187 * Return value:
4188 * number of bytes printed to buffer
4189 */
4190static ssize_t pmcraid_show_log_level(
4191 struct device *dev,
4192 struct device_attribute *attr,
4193 char *buf)
4194{
4195 struct Scsi_Host *shost = class_to_shost(dev);
4196 struct pmcraid_instance *pinstance =
4197 (struct pmcraid_instance *)shost->hostdata;
4198 return snprintf(buf, PAGE_SIZE, "%d\n", pinstance->current_log_level);
4199}
4200
4201/**
4202 * pmcraid_store_log_level - Change the adapter's error logging level
4203 * @dev: class device struct
4204 * @buf: buffer
4205 * @count: not used
4206 *
4207 * Return value:
4208 * number of bytes printed to buffer
4209 */
4210static ssize_t pmcraid_store_log_level(
4211 struct device *dev,
4212 struct device_attribute *attr,
4213 const char *buf,
4214 size_t count
4215)
4216{
4217 struct Scsi_Host *shost;
4218 struct pmcraid_instance *pinstance;
4219 unsigned long val;
4220
4221 if (strict_strtoul(buf, 10, &val))
4222 return -EINVAL;
4223 /* log-level should be from 0 to 2 */
4224 if (val > 2)
4225 return -EINVAL;
4226
4227 shost = class_to_shost(dev);
4228 pinstance = (struct pmcraid_instance *)shost->hostdata;
4229 pinstance->current_log_level = val;
4230
4231 return strlen(buf);
4232}
4233
4234static struct device_attribute pmcraid_log_level_attr = {
4235 .attr = {
4236 .name = "log_level",
4237 .mode = S_IRUGO | S_IWUSR,
4238 },
4239 .show = pmcraid_show_log_level,
4240 .store = pmcraid_store_log_level,
4241};
4242
4243/**
4244 * pmcraid_show_drv_version - Display driver version
4245 * @dev: class device struct
4246 * @buf: buffer
4247 *
4248 * Return value:
4249 * number of bytes printed to buffer
4250 */
4251static ssize_t pmcraid_show_drv_version(
4252 struct device *dev,
4253 struct device_attribute *attr,
4254 char *buf
4255)
4256{
4257 return snprintf(buf, PAGE_SIZE, "version: %s\n",
4258 PMCRAID_DRIVER_VERSION);
4259}
4260
4261static struct device_attribute pmcraid_driver_version_attr = {
4262 .attr = {
4263 .name = "drv_version",
4264 .mode = S_IRUGO,
4265 },
4266 .show = pmcraid_show_drv_version,
4267};
4268
4269/**
4270 * pmcraid_show_io_adapter_id - Display driver assigned adapter id
4271 * @dev: class device struct
4272 * @buf: buffer
4273 *
4274 * Return value:
4275 * number of bytes printed to buffer
4276 */
4277static ssize_t pmcraid_show_adapter_id(
4278 struct device *dev,
4279 struct device_attribute *attr,
4280 char *buf
4281)
4282{
4283 struct Scsi_Host *shost = class_to_shost(dev);
4284 struct pmcraid_instance *pinstance =
4285 (struct pmcraid_instance *)shost->hostdata;
4286 u32 adapter_id = (pinstance->pdev->bus->number << 8) |
4287 pinstance->pdev->devfn;
4288 u32 aen_group = pmcraid_event_family.id;
4289
4290 return snprintf(buf, PAGE_SIZE,
4291 "adapter id: %d\nminor: %d\naen group: %d\n",
4292 adapter_id, MINOR(pinstance->cdev.dev), aen_group);
4293}
4294
4295static struct device_attribute pmcraid_adapter_id_attr = {
4296 .attr = {
4297 .name = "adapter_id",
4298 .mode = S_IRUGO | S_IWUSR,
4299 },
4300 .show = pmcraid_show_adapter_id,
4301};
4302
4303static struct device_attribute *pmcraid_host_attrs[] = {
4304 &pmcraid_log_level_attr,
4305 &pmcraid_driver_version_attr,
4306 &pmcraid_adapter_id_attr,
4307 NULL,
4308};
4309
4310
4311/* host template structure for pmcraid driver */
4312static struct scsi_host_template pmcraid_host_template = {
4313 .module = THIS_MODULE,
4314 .name = PMCRAID_DRIVER_NAME,
4315 .queuecommand = pmcraid_queuecommand,
4316 .eh_abort_handler = pmcraid_eh_abort_handler,
4317 .eh_bus_reset_handler = pmcraid_eh_bus_reset_handler,
4318 .eh_target_reset_handler = pmcraid_eh_target_reset_handler,
4319 .eh_device_reset_handler = pmcraid_eh_device_reset_handler,
4320 .eh_host_reset_handler = pmcraid_eh_host_reset_handler,
4321
4322 .slave_alloc = pmcraid_slave_alloc,
4323 .slave_configure = pmcraid_slave_configure,
4324 .slave_destroy = pmcraid_slave_destroy,
4325 .change_queue_depth = pmcraid_change_queue_depth,
4326 .change_queue_type = pmcraid_change_queue_type,
4327 .can_queue = PMCRAID_MAX_IO_CMD,
4328 .this_id = -1,
4329 .sg_tablesize = PMCRAID_MAX_IOADLS,
4330 .max_sectors = PMCRAID_IOA_MAX_SECTORS,
4331 .cmd_per_lun = PMCRAID_MAX_CMD_PER_LUN,
4332 .use_clustering = ENABLE_CLUSTERING,
4333 .shost_attrs = pmcraid_host_attrs,
4334 .proc_name = PMCRAID_DRIVER_NAME
4335};
4336
4337/*
4338 * pmcraid_isr_msix - implements MSI-X interrupt handling routine
4339 * @irq: interrupt vector number
4340 * @dev_id: pointer hrrq_vector
4341 *
4342 * Return Value
4343 * IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
4344 */
4345
4346static irqreturn_t pmcraid_isr_msix(int irq, void *dev_id)
4347{
4348 struct pmcraid_isr_param *hrrq_vector;
4349 struct pmcraid_instance *pinstance;
4350 unsigned long lock_flags;
4351 u32 intrs_val;
4352 int hrrq_id;
4353
4354 hrrq_vector = (struct pmcraid_isr_param *)dev_id;
4355 hrrq_id = hrrq_vector->hrrq_id;
4356 pinstance = hrrq_vector->drv_inst;
4357
4358 if (!hrrq_id) {
4359 /* Read the interrupt */
4360 intrs_val = pmcraid_read_interrupts(pinstance);
4361 if (intrs_val &&
4362 ((ioread32(pinstance->int_regs.host_ioa_interrupt_reg)
4363 & DOORBELL_INTR_MSIX_CLR) == 0)) {
4364 /* Any error interrupts including unit_check,
4365 * initiate IOA reset.In case of unit check indicate
4366 * to reset_sequence that IOA unit checked and prepare
4367 * for a dump during reset sequence
4368 */
4369 if (intrs_val & PMCRAID_ERROR_INTERRUPTS) {
4370 if (intrs_val & INTRS_IOA_UNIT_CHECK)
4371 pinstance->ioa_unit_check = 1;
4372
4373 pmcraid_err("ISR: error interrupts: %x \
4374 initiating reset\n", intrs_val);
4375 spin_lock_irqsave(pinstance->host->host_lock,
4376 lock_flags);
4377 pmcraid_initiate_reset(pinstance);
4378 spin_unlock_irqrestore(
4379 pinstance->host->host_lock,
4380 lock_flags);
4381 }
4382 /* If interrupt was as part of the ioa initialization,
4383 * clear it. Delete the timer and wakeup the
4384 * reset engine to proceed with reset sequence
4385 */
4386 if (intrs_val & INTRS_TRANSITION_TO_OPERATIONAL)
4387 pmcraid_clr_trans_op(pinstance);
4388
4389 /* Clear the interrupt register by writing
4390 * to host to ioa doorbell. Once done
4391 * FW will clear the interrupt.
4392 */
4393 iowrite32(DOORBELL_INTR_MSIX_CLR,
4394 pinstance->int_regs.host_ioa_interrupt_reg);
4395 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
4396
4397
4398 }
4399 }
4400
4401 tasklet_schedule(&(pinstance->isr_tasklet[hrrq_id]));
4402
4403 return IRQ_HANDLED;
4404}
4405
4406/**
4407 * pmcraid_isr - implements legacy interrupt handling routine
4408 *
4409 * @irq: interrupt vector number
4410 * @dev_id: pointer hrrq_vector
4411 *
4412 * Return Value
4413 * IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
4414 */
4415static irqreturn_t pmcraid_isr(int irq, void *dev_id)
4416{
4417 struct pmcraid_isr_param *hrrq_vector;
4418 struct pmcraid_instance *pinstance;
4419 u32 intrs;
4420 unsigned long lock_flags;
4421 int hrrq_id = 0;
4422
4423 /* In case of legacy interrupt mode where interrupts are shared across
4424 * isrs, it may be possible that the current interrupt is not from IOA
4425 */
4426 if (!dev_id) {
4427 printk(KERN_INFO "%s(): NULL host pointer\n", __func__);
4428 return IRQ_NONE;
4429 }
4430 hrrq_vector = (struct pmcraid_isr_param *)dev_id;
4431 pinstance = hrrq_vector->drv_inst;
4432
4433 intrs = pmcraid_read_interrupts(pinstance);
4434
4435 if (unlikely((intrs & PMCRAID_PCI_INTERRUPTS) == 0))
4436 return IRQ_NONE;
4437
4438 /* Any error interrupts including unit_check, initiate IOA reset.
4439 * In case of unit check indicate to reset_sequence that IOA unit
4440 * checked and prepare for a dump during reset sequence
4441 */
4442 if (intrs & PMCRAID_ERROR_INTERRUPTS) {
4443
4444 if (intrs & INTRS_IOA_UNIT_CHECK)
4445 pinstance->ioa_unit_check = 1;
4446
4447 iowrite32(intrs,
4448 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4449 pmcraid_err("ISR: error interrupts: %x initiating reset\n",
4450 intrs);
4451 intrs = ioread32(
4452 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4453 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
4454 pmcraid_initiate_reset(pinstance);
4455 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
4456 } else {
4457 /* If interrupt was as part of the ioa initialization,
4458 * clear. Delete the timer and wakeup the
4459 * reset engine to proceed with reset sequence
4460 */
4461 if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
4462 pmcraid_clr_trans_op(pinstance);
4463 } else {
4464 iowrite32(intrs,
4465 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4466 ioread32(
4467 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4468
4469 tasklet_schedule(
4470 &(pinstance->isr_tasklet[hrrq_id]));
4471 }
4472 }
4473
4474 return IRQ_HANDLED;
4475}
4476
4477
4478/**
4479 * pmcraid_worker_function - worker thread function
4480 *
4481 * @workp: pointer to struct work queue
4482 *
4483 * Return Value
4484 * None
4485 */
4486
4487static void pmcraid_worker_function(struct work_struct *workp)
4488{
4489 struct pmcraid_instance *pinstance;
4490 struct pmcraid_resource_entry *res;
4491 struct pmcraid_resource_entry *temp;
4492 struct scsi_device *sdev;
4493 unsigned long lock_flags;
4494 unsigned long host_lock_flags;
4495 u16 fw_version;
4496 u8 bus, target, lun;
4497
4498 pinstance = container_of(workp, struct pmcraid_instance, worker_q);
4499 /* add resources only after host is added into system */
4500 if (!atomic_read(&pinstance->expose_resources))
4501 return;
4502
4503 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
4504
4505 spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
4506 list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue) {
4507
4508 if (res->change_detected == RES_CHANGE_DEL && res->scsi_dev) {
4509 sdev = res->scsi_dev;
4510
4511 /* host_lock must be held before calling
4512 * scsi_device_get
4513 */
4514 spin_lock_irqsave(pinstance->host->host_lock,
4515 host_lock_flags);
4516 if (!scsi_device_get(sdev)) {
4517 spin_unlock_irqrestore(
4518 pinstance->host->host_lock,
4519 host_lock_flags);
4520 pmcraid_info("deleting %x from midlayer\n",
4521 res->cfg_entry.resource_address);
4522 list_move_tail(&res->queue,
4523 &pinstance->free_res_q);
4524 spin_unlock_irqrestore(
4525 &pinstance->resource_lock,
4526 lock_flags);
4527 scsi_remove_device(sdev);
4528 scsi_device_put(sdev);
4529 spin_lock_irqsave(&pinstance->resource_lock,
4530 lock_flags);
4531 res->change_detected = 0;
4532 } else {
4533 spin_unlock_irqrestore(
4534 pinstance->host->host_lock,
4535 host_lock_flags);
4536 }
4537 }
4538 }
4539
4540 list_for_each_entry(res, &pinstance->used_res_q, queue) {
4541
4542 if (res->change_detected == RES_CHANGE_ADD) {
4543
4544 if (!pmcraid_expose_resource(fw_version,
4545 &res->cfg_entry))
4546 continue;
4547
4548 if (RES_IS_VSET(res->cfg_entry)) {
4549 bus = PMCRAID_VSET_BUS_ID;
4550 if (fw_version <= PMCRAID_FW_VERSION_1)
4551 target = res->cfg_entry.unique_flags1;
4552 else
4553 target = res->cfg_entry.array_id & 0xFF;
4554 lun = PMCRAID_VSET_LUN_ID;
4555 } else {
4556 bus = PMCRAID_PHYS_BUS_ID;
4557 target =
4558 RES_TARGET(
4559 res->cfg_entry.resource_address);
4560 lun = RES_LUN(res->cfg_entry.resource_address);
4561 }
4562
4563 res->change_detected = 0;
4564 spin_unlock_irqrestore(&pinstance->resource_lock,
4565 lock_flags);
4566 scsi_add_device(pinstance->host, bus, target, lun);
4567 spin_lock_irqsave(&pinstance->resource_lock,
4568 lock_flags);
4569 }
4570 }
4571
4572 spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
4573}
4574
4575/**
4576 * pmcraid_tasklet_function - Tasklet function
4577 *
4578 * @instance: pointer to msix param structure
4579 *
4580 * Return Value
4581 * None
4582 */
4583static void pmcraid_tasklet_function(unsigned long instance)
4584{
4585 struct pmcraid_isr_param *hrrq_vector;
4586 struct pmcraid_instance *pinstance;
4587 unsigned long hrrq_lock_flags;
4588 unsigned long pending_lock_flags;
4589 unsigned long host_lock_flags;
4590 spinlock_t *lockp; /* hrrq buffer lock */
4591 int id;
4592 __le32 resp;
4593
4594 hrrq_vector = (struct pmcraid_isr_param *)instance;
4595 pinstance = hrrq_vector->drv_inst;
4596 id = hrrq_vector->hrrq_id;
4597 lockp = &(pinstance->hrrq_lock[id]);
4598
4599 /* loop through each of the commands responded by IOA. Each HRRQ buf is
4600 * protected by its own lock. Traversals must be done within this lock
4601 * as there may be multiple tasklets running on multiple CPUs. Note
4602 * that the lock is held just for picking up the response handle and
4603 * manipulating hrrq_curr/toggle_bit values.
4604 */
4605 spin_lock_irqsave(lockp, hrrq_lock_flags);
4606
4607 resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4608
4609 while ((resp & HRRQ_TOGGLE_BIT) ==
4610 pinstance->host_toggle_bit[id]) {
4611
4612 int cmd_index = resp >> 2;
4613 struct pmcraid_cmd *cmd = NULL;
4614
4615 if (pinstance->hrrq_curr[id] < pinstance->hrrq_end[id]) {
4616 pinstance->hrrq_curr[id]++;
4617 } else {
4618 pinstance->hrrq_curr[id] = pinstance->hrrq_start[id];
4619 pinstance->host_toggle_bit[id] ^= 1u;
4620 }
4621
4622 if (cmd_index >= PMCRAID_MAX_CMD) {
4623 /* In case of invalid response handle, log message */
4624 pmcraid_err("Invalid response handle %d\n", cmd_index);
4625 resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4626 continue;
4627 }
4628
4629 cmd = pinstance->cmd_list[cmd_index];
4630 spin_unlock_irqrestore(lockp, hrrq_lock_flags);
4631
4632 spin_lock_irqsave(&pinstance->pending_pool_lock,
4633 pending_lock_flags);
4634 list_del(&cmd->free_list);
4635 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
4636 pending_lock_flags);
4637 del_timer(&cmd->timer);
4638 atomic_dec(&pinstance->outstanding_cmds);
4639
4640 if (cmd->cmd_done == pmcraid_ioa_reset) {
4641 spin_lock_irqsave(pinstance->host->host_lock,
4642 host_lock_flags);
4643 cmd->cmd_done(cmd);
4644 spin_unlock_irqrestore(pinstance->host->host_lock,
4645 host_lock_flags);
4646 } else if (cmd->cmd_done != NULL) {
4647 cmd->cmd_done(cmd);
4648 }
4649 /* loop over until we are done with all responses */
4650 spin_lock_irqsave(lockp, hrrq_lock_flags);
4651 resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4652 }
4653
4654 spin_unlock_irqrestore(lockp, hrrq_lock_flags);
4655}
4656
4657/**
4658 * pmcraid_unregister_interrupt_handler - de-register interrupts handlers
4659 * @pinstance: pointer to adapter instance structure
4660 *
4661 * This routine un-registers registered interrupt handler and
4662 * also frees irqs/vectors.
4663 *
4664 * Retun Value
4665 * None
4666 */
4667static
4668void pmcraid_unregister_interrupt_handler(struct pmcraid_instance *pinstance)
4669{
4670 int i;
4671
4672 for (i = 0; i < pinstance->num_hrrq; i++)
4673 free_irq(pinstance->hrrq_vector[i].vector,
4674 &(pinstance->hrrq_vector[i]));
4675
4676 if (pinstance->interrupt_mode) {
4677 pci_disable_msix(pinstance->pdev);
4678 pinstance->interrupt_mode = 0;
4679 }
4680}
4681
4682/**
4683 * pmcraid_register_interrupt_handler - registers interrupt handler
4684 * @pinstance: pointer to per-adapter instance structure
4685 *
4686 * Return Value
4687 * 0 on success, non-zero error code otherwise.
4688 */
4689static int
4690pmcraid_register_interrupt_handler(struct pmcraid_instance *pinstance)
4691{
4692 int rc;
4693 struct pci_dev *pdev = pinstance->pdev;
4694
4695 if ((pmcraid_enable_msix) &&
4696 (pci_find_capability(pdev, PCI_CAP_ID_MSIX))) {
4697 int num_hrrq = PMCRAID_NUM_MSIX_VECTORS;
4698 struct msix_entry entries[PMCRAID_NUM_MSIX_VECTORS];
4699 int i;
4700 for (i = 0; i < PMCRAID_NUM_MSIX_VECTORS; i++)
4701 entries[i].entry = i;
4702
4703 rc = pci_enable_msix(pdev, entries, num_hrrq);
4704 if (rc < 0)
4705 goto pmcraid_isr_legacy;
4706
4707 /* Check how many MSIX vectors are allocated and register
4708 * msi-x handlers for each of them giving appropriate buffer
4709 */
4710 if (rc > 0) {
4711 num_hrrq = rc;
4712 if (pci_enable_msix(pdev, entries, num_hrrq))
4713 goto pmcraid_isr_legacy;
4714 }
4715
4716 for (i = 0; i < num_hrrq; i++) {
4717 pinstance->hrrq_vector[i].hrrq_id = i;
4718 pinstance->hrrq_vector[i].drv_inst = pinstance;
4719 pinstance->hrrq_vector[i].vector = entries[i].vector;
4720 rc = request_irq(pinstance->hrrq_vector[i].vector,
4721 pmcraid_isr_msix, 0,
4722 PMCRAID_DRIVER_NAME,
4723 &(pinstance->hrrq_vector[i]));
4724
4725 if (rc) {
4726 int j;
4727 for (j = 0; j < i; j++)
4728 free_irq(entries[j].vector,
4729 &(pinstance->hrrq_vector[j]));
4730 pci_disable_msix(pdev);
4731 goto pmcraid_isr_legacy;
4732 }
4733 }
4734
4735 pinstance->num_hrrq = num_hrrq;
4736 pinstance->interrupt_mode = 1;
4737 iowrite32(DOORBELL_INTR_MODE_MSIX,
4738 pinstance->int_regs.host_ioa_interrupt_reg);
4739 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
4740 goto pmcraid_isr_out;
4741 }
4742
4743pmcraid_isr_legacy:
4744 /* If MSI-X registration failed fallback to legacy mode, where
4745 * only one hrrq entry will be used
4746 */
4747 pinstance->hrrq_vector[0].hrrq_id = 0;
4748 pinstance->hrrq_vector[0].drv_inst = pinstance;
4749 pinstance->hrrq_vector[0].vector = pdev->irq;
4750 pinstance->num_hrrq = 1;
4751 rc = 0;
4752
4753 rc = request_irq(pdev->irq, pmcraid_isr, IRQF_SHARED,
4754 PMCRAID_DRIVER_NAME, &pinstance->hrrq_vector[0]);
4755pmcraid_isr_out:
4756 return rc;
4757}
4758
4759/**
4760 * pmcraid_release_cmd_blocks - release buufers allocated for command blocks
4761 * @pinstance: per adapter instance structure pointer
4762 * @max_index: number of buffer blocks to release
4763 *
4764 * Return Value
4765 * None
4766 */
4767static void
4768pmcraid_release_cmd_blocks(struct pmcraid_instance *pinstance, int max_index)
4769{
4770 int i;
4771 for (i = 0; i < max_index; i++) {
4772 kmem_cache_free(pinstance->cmd_cachep, pinstance->cmd_list[i]);
4773 pinstance->cmd_list[i] = NULL;
4774 }
4775 kmem_cache_destroy(pinstance->cmd_cachep);
4776 pinstance->cmd_cachep = NULL;
4777}
4778
4779/**
4780 * pmcraid_release_control_blocks - releases buffers alloced for control blocks
4781 * @pinstance: pointer to per adapter instance structure
4782 * @max_index: number of buffers (from 0 onwards) to release
4783 *
4784 * This function assumes that the command blocks for which control blocks are
4785 * linked are not released.
4786 *
4787 * Return Value
4788 * None
4789 */
4790static void
4791pmcraid_release_control_blocks(
4792 struct pmcraid_instance *pinstance,
4793 int max_index
4794)
4795{
4796 int i;
4797
4798 if (pinstance->control_pool == NULL)
4799 return;
4800
4801 for (i = 0; i < max_index; i++) {
4802 pci_pool_free(pinstance->control_pool,
4803 pinstance->cmd_list[i]->ioa_cb,
4804 pinstance->cmd_list[i]->ioa_cb_bus_addr);
4805 pinstance->cmd_list[i]->ioa_cb = NULL;
4806 pinstance->cmd_list[i]->ioa_cb_bus_addr = 0;
4807 }
4808 pci_pool_destroy(pinstance->control_pool);
4809 pinstance->control_pool = NULL;
4810}
4811
4812/**
4813 * pmcraid_allocate_cmd_blocks - allocate memory for cmd block structures
4814 * @pinstance - pointer to per adapter instance structure
4815 *
4816 * Allocates memory for command blocks using kernel slab allocator.
4817 *
4818 * Return Value
4819 * 0 in case of success; -ENOMEM in case of failure
4820 */
4821static int __devinit
4822pmcraid_allocate_cmd_blocks(struct pmcraid_instance *pinstance)
4823{
4824 int i;
4825
4826 sprintf(pinstance->cmd_pool_name, "pmcraid_cmd_pool_%d",
4827 pinstance->host->unique_id);
4828
4829
4830 pinstance->cmd_cachep = kmem_cache_create(
4831 pinstance->cmd_pool_name,
4832 sizeof(struct pmcraid_cmd), 0,
4833 SLAB_HWCACHE_ALIGN, NULL);
4834 if (!pinstance->cmd_cachep)
4835 return -ENOMEM;
4836
4837 for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4838 pinstance->cmd_list[i] =
4839 kmem_cache_alloc(pinstance->cmd_cachep, GFP_KERNEL);
4840 if (!pinstance->cmd_list[i]) {
4841 pmcraid_release_cmd_blocks(pinstance, i);
4842 return -ENOMEM;
4843 }
4844 }
4845 return 0;
4846}
4847
4848/**
4849 * pmcraid_allocate_control_blocks - allocates memory control blocks
4850 * @pinstance : pointer to per adapter instance structure
4851 *
4852 * This function allocates PCI memory for DMAable buffers like IOARCB, IOADLs
4853 * and IOASAs. This is called after command blocks are already allocated.
4854 *
4855 * Return Value
4856 * 0 in case it can allocate all control blocks, otherwise -ENOMEM
4857 */
4858static int __devinit
4859pmcraid_allocate_control_blocks(struct pmcraid_instance *pinstance)
4860{
4861 int i;
4862
4863 sprintf(pinstance->ctl_pool_name, "pmcraid_control_pool_%d",
4864 pinstance->host->unique_id);
4865
4866 pinstance->control_pool =
4867 pci_pool_create(pinstance->ctl_pool_name,
4868 pinstance->pdev,
4869 sizeof(struct pmcraid_control_block),
4870 PMCRAID_IOARCB_ALIGNMENT, 0);
4871
4872 if (!pinstance->control_pool)
4873 return -ENOMEM;
4874
4875 for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4876 pinstance->cmd_list[i]->ioa_cb =
4877 pci_pool_alloc(
4878 pinstance->control_pool,
4879 GFP_KERNEL,
4880 &(pinstance->cmd_list[i]->ioa_cb_bus_addr));
4881
4882 if (!pinstance->cmd_list[i]->ioa_cb) {
4883 pmcraid_release_control_blocks(pinstance, i);
4884 return -ENOMEM;
4885 }
4886 memset(pinstance->cmd_list[i]->ioa_cb, 0,
4887 sizeof(struct pmcraid_control_block));
4888 }
4889 return 0;
4890}
4891
4892/**
4893 * pmcraid_release_host_rrqs - release memory allocated for hrrq buffer(s)
4894 * @pinstance: pointer to per adapter instance structure
4895 * @maxindex: size of hrrq buffer pointer array
4896 *
4897 * Return Value
4898 * None
4899 */
4900static void
4901pmcraid_release_host_rrqs(struct pmcraid_instance *pinstance, int maxindex)
4902{
4903 int i;
4904 for (i = 0; i < maxindex; i++) {
4905
4906 pci_free_consistent(pinstance->pdev,
4907 HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD,
4908 pinstance->hrrq_start[i],
4909 pinstance->hrrq_start_bus_addr[i]);
4910
4911 /* reset pointers and toggle bit to zeros */
4912 pinstance->hrrq_start[i] = NULL;
4913 pinstance->hrrq_start_bus_addr[i] = 0;
4914 pinstance->host_toggle_bit[i] = 0;
4915 }
4916}
4917
4918/**
4919 * pmcraid_allocate_host_rrqs - Allocate and initialize host RRQ buffers
4920 * @pinstance: pointer to per adapter instance structure
4921 *
4922 * Return value
4923 * 0 hrrq buffers are allocated, -ENOMEM otherwise.
4924 */
4925static int __devinit
4926pmcraid_allocate_host_rrqs(struct pmcraid_instance *pinstance)
4927{
4928 int i, buffer_size;
4929
4930 buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
4931
4932 for (i = 0; i < pinstance->num_hrrq; i++) {
4933 pinstance->hrrq_start[i] =
4934 pci_alloc_consistent(
4935 pinstance->pdev,
4936 buffer_size,
4937 &(pinstance->hrrq_start_bus_addr[i]));
4938
4939 if (pinstance->hrrq_start[i] == 0) {
4940 pmcraid_err("pci_alloc failed for hrrq vector : %d\n",
4941 i);
4942 pmcraid_release_host_rrqs(pinstance, i);
4943 return -ENOMEM;
4944 }
4945
4946 memset(pinstance->hrrq_start[i], 0, buffer_size);
4947 pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
4948 pinstance->hrrq_end[i] =
4949 pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
4950 pinstance->host_toggle_bit[i] = 1;
4951 spin_lock_init(&pinstance->hrrq_lock[i]);
4952 }
4953 return 0;
4954}
4955
4956/**
4957 * pmcraid_release_hcams - release HCAM buffers
4958 *
4959 * @pinstance: pointer to per adapter instance structure
4960 *
4961 * Return value
4962 * none
4963 */
4964static void pmcraid_release_hcams(struct pmcraid_instance *pinstance)
4965{
4966 if (pinstance->ccn.msg != NULL) {
4967 pci_free_consistent(pinstance->pdev,
4968 PMCRAID_AEN_HDR_SIZE +
4969 sizeof(struct pmcraid_hcam_ccn_ext),
4970 pinstance->ccn.msg,
4971 pinstance->ccn.baddr);
4972
4973 pinstance->ccn.msg = NULL;
4974 pinstance->ccn.hcam = NULL;
4975 pinstance->ccn.baddr = 0;
4976 }
4977
4978 if (pinstance->ldn.msg != NULL) {
4979 pci_free_consistent(pinstance->pdev,
4980 PMCRAID_AEN_HDR_SIZE +
4981 sizeof(struct pmcraid_hcam_ldn),
4982 pinstance->ldn.msg,
4983 pinstance->ldn.baddr);
4984
4985 pinstance->ldn.msg = NULL;
4986 pinstance->ldn.hcam = NULL;
4987 pinstance->ldn.baddr = 0;
4988 }
4989}
4990
4991/**
4992 * pmcraid_allocate_hcams - allocates HCAM buffers
4993 * @pinstance : pointer to per adapter instance structure
4994 *
4995 * Return Value:
4996 * 0 in case of successful allocation, non-zero otherwise
4997 */
4998static int pmcraid_allocate_hcams(struct pmcraid_instance *pinstance)
4999{
5000 pinstance->ccn.msg = pci_alloc_consistent(
5001 pinstance->pdev,
5002 PMCRAID_AEN_HDR_SIZE +
5003 sizeof(struct pmcraid_hcam_ccn_ext),
5004 &(pinstance->ccn.baddr));
5005
5006 pinstance->ldn.msg = pci_alloc_consistent(
5007 pinstance->pdev,
5008 PMCRAID_AEN_HDR_SIZE +
5009 sizeof(struct pmcraid_hcam_ldn),
5010 &(pinstance->ldn.baddr));
5011
5012 if (pinstance->ldn.msg == NULL || pinstance->ccn.msg == NULL) {
5013 pmcraid_release_hcams(pinstance);
5014 } else {
5015 pinstance->ccn.hcam =
5016 (void *)pinstance->ccn.msg + PMCRAID_AEN_HDR_SIZE;
5017 pinstance->ldn.hcam =
5018 (void *)pinstance->ldn.msg + PMCRAID_AEN_HDR_SIZE;
5019
5020 atomic_set(&pinstance->ccn.ignore, 0);
5021 atomic_set(&pinstance->ldn.ignore, 0);
5022 }
5023
5024 return (pinstance->ldn.msg == NULL) ? -ENOMEM : 0;
5025}
5026
5027/**
5028 * pmcraid_release_config_buffers - release config.table buffers
5029 * @pinstance: pointer to per adapter instance structure
5030 *
5031 * Return Value
5032 * none
5033 */
5034static void pmcraid_release_config_buffers(struct pmcraid_instance *pinstance)
5035{
5036 if (pinstance->cfg_table != NULL &&
5037 pinstance->cfg_table_bus_addr != 0) {
5038 pci_free_consistent(pinstance->pdev,
5039 sizeof(struct pmcraid_config_table),
5040 pinstance->cfg_table,
5041 pinstance->cfg_table_bus_addr);
5042 pinstance->cfg_table = NULL;
5043 pinstance->cfg_table_bus_addr = 0;
5044 }
5045
5046 if (pinstance->res_entries != NULL) {
5047 int i;
5048
5049 for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
5050 list_del(&pinstance->res_entries[i].queue);
5051 kfree(pinstance->res_entries);
5052 pinstance->res_entries = NULL;
5053 }
5054
5055 pmcraid_release_hcams(pinstance);
5056}
5057
5058/**
5059 * pmcraid_allocate_config_buffers - allocates DMAable memory for config table
5060 * @pinstance : pointer to per adapter instance structure
5061 *
5062 * Return Value
5063 * 0 for successful allocation, -ENOMEM for any failure
5064 */
5065static int __devinit
5066pmcraid_allocate_config_buffers(struct pmcraid_instance *pinstance)
5067{
5068 int i;
5069
5070 pinstance->res_entries =
5071 kzalloc(sizeof(struct pmcraid_resource_entry) *
5072 PMCRAID_MAX_RESOURCES, GFP_KERNEL);
5073
5074 if (NULL == pinstance->res_entries) {
5075 pmcraid_err("failed to allocate memory for resource table\n");
5076 return -ENOMEM;
5077 }
5078
5079 for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
5080 list_add_tail(&pinstance->res_entries[i].queue,
5081 &pinstance->free_res_q);
5082
5083 pinstance->cfg_table =
5084 pci_alloc_consistent(pinstance->pdev,
5085 sizeof(struct pmcraid_config_table),
5086 &pinstance->cfg_table_bus_addr);
5087
5088 if (NULL == pinstance->cfg_table) {
5089 pmcraid_err("couldn't alloc DMA memory for config table\n");
5090 pmcraid_release_config_buffers(pinstance);
5091 return -ENOMEM;
5092 }
5093
5094 if (pmcraid_allocate_hcams(pinstance)) {
5095 pmcraid_err("could not alloc DMA memory for HCAMS\n");
5096 pmcraid_release_config_buffers(pinstance);
5097 return -ENOMEM;
5098 }
5099
5100 return 0;
5101}
5102
5103/**
5104 * pmcraid_init_tasklets - registers tasklets for response handling
5105 *
5106 * @pinstance: pointer adapter instance structure
5107 *
5108 * Return value
5109 * none
5110 */
5111static void pmcraid_init_tasklets(struct pmcraid_instance *pinstance)
5112{
5113 int i;
5114 for (i = 0; i < pinstance->num_hrrq; i++)
5115 tasklet_init(&pinstance->isr_tasklet[i],
5116 pmcraid_tasklet_function,
5117 (unsigned long)&pinstance->hrrq_vector[i]);
5118}
5119
5120/**
5121 * pmcraid_kill_tasklets - destroys tasklets registered for response handling
5122 *
5123 * @pinstance: pointer to adapter instance structure
5124 *
5125 * Return value
5126 * none
5127 */
5128static void pmcraid_kill_tasklets(struct pmcraid_instance *pinstance)
5129{
5130 int i;
5131 for (i = 0; i < pinstance->num_hrrq; i++)
5132 tasklet_kill(&pinstance->isr_tasklet[i]);
5133}
5134
5135/**
5136 * pmcraid_release_buffers - release per-adapter buffers allocated
5137 *
5138 * @pinstance: pointer to adapter soft state
5139 *
5140 * Return Value
5141 * none
5142 */
5143static void pmcraid_release_buffers(struct pmcraid_instance *pinstance)
5144{
5145 pmcraid_release_config_buffers(pinstance);
5146 pmcraid_release_control_blocks(pinstance, PMCRAID_MAX_CMD);
5147 pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
5148 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5149
5150 if (pinstance->inq_data != NULL) {
5151 pci_free_consistent(pinstance->pdev,
5152 sizeof(struct pmcraid_inquiry_data),
5153 pinstance->inq_data,
5154 pinstance->inq_data_baddr);
5155
5156 pinstance->inq_data = NULL;
5157 pinstance->inq_data_baddr = 0;
5158 }
5159
5160 if (pinstance->timestamp_data != NULL) {
5161 pci_free_consistent(pinstance->pdev,
5162 sizeof(struct pmcraid_timestamp_data),
5163 pinstance->timestamp_data,
5164 pinstance->timestamp_data_baddr);
5165
5166 pinstance->timestamp_data = NULL;
5167 pinstance->timestamp_data_baddr = 0;
5168 }
5169}
5170
5171/**
5172 * pmcraid_init_buffers - allocates memory and initializes various structures
5173 * @pinstance: pointer to per adapter instance structure
5174 *
5175 * This routine pre-allocates memory based on the type of block as below:
5176 * cmdblocks(PMCRAID_MAX_CMD): kernel memory using kernel's slab_allocator,
5177 * IOARCBs(PMCRAID_MAX_CMD) : DMAable memory, using pci pool allocator
5178 * config-table entries : DMAable memory using pci_alloc_consistent
5179 * HostRRQs : DMAable memory, using pci_alloc_consistent
5180 *
5181 * Return Value
5182 * 0 in case all of the blocks are allocated, -ENOMEM otherwise.
5183 */
5184static int __devinit pmcraid_init_buffers(struct pmcraid_instance *pinstance)
5185{
5186 int i;
5187
5188 if (pmcraid_allocate_host_rrqs(pinstance)) {
5189 pmcraid_err("couldn't allocate memory for %d host rrqs\n",
5190 pinstance->num_hrrq);
5191 return -ENOMEM;
5192 }
5193
5194 if (pmcraid_allocate_config_buffers(pinstance)) {
5195 pmcraid_err("couldn't allocate memory for config buffers\n");
5196 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5197 return -ENOMEM;
5198 }
5199
5200 if (pmcraid_allocate_cmd_blocks(pinstance)) {
5201 pmcraid_err("couldn't allocate memory for cmd blocks\n");
5202 pmcraid_release_config_buffers(pinstance);
5203 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5204 return -ENOMEM;
5205 }
5206
5207 if (pmcraid_allocate_control_blocks(pinstance)) {
5208 pmcraid_err("couldn't allocate memory control blocks\n");
5209 pmcraid_release_config_buffers(pinstance);
5210 pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
5211 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5212 return -ENOMEM;
5213 }
5214
5215 /* allocate DMAable memory for page D0 INQUIRY buffer */
5216 pinstance->inq_data = pci_alloc_consistent(
5217 pinstance->pdev,
5218 sizeof(struct pmcraid_inquiry_data),
5219 &pinstance->inq_data_baddr);
5220
5221 if (pinstance->inq_data == NULL) {
5222 pmcraid_err("couldn't allocate DMA memory for INQUIRY\n");
5223 pmcraid_release_buffers(pinstance);
5224 return -ENOMEM;
5225 }
5226
5227 /* allocate DMAable memory for set timestamp data buffer */
5228 pinstance->timestamp_data = pci_alloc_consistent(
5229 pinstance->pdev,
5230 sizeof(struct pmcraid_timestamp_data),
5231 &pinstance->timestamp_data_baddr);
5232
5233 if (pinstance->timestamp_data == NULL) {
5234 pmcraid_err("couldn't allocate DMA memory for \
5235 set time_stamp \n");
5236 pmcraid_release_buffers(pinstance);
5237 return -ENOMEM;
5238 }
5239
5240
5241 /* Initialize all the command blocks and add them to free pool. No
5242 * need to lock (free_pool_lock) as this is done in initialization
5243 * itself
5244 */
5245 for (i = 0; i < PMCRAID_MAX_CMD; i++) {
5246 struct pmcraid_cmd *cmdp = pinstance->cmd_list[i];
5247 pmcraid_init_cmdblk(cmdp, i);
5248 cmdp->drv_inst = pinstance;
5249 list_add_tail(&cmdp->free_list, &pinstance->free_cmd_pool);
5250 }
5251
5252 return 0;
5253}
5254
5255/**
5256 * pmcraid_reinit_buffers - resets various buffer pointers
5257 * @pinstance: pointer to adapter instance
5258 * Return value
5259 * none
5260 */
5261static void pmcraid_reinit_buffers(struct pmcraid_instance *pinstance)
5262{
5263 int i;
5264 int buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
5265
5266 for (i = 0; i < pinstance->num_hrrq; i++) {
5267 memset(pinstance->hrrq_start[i], 0, buffer_size);
5268 pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
5269 pinstance->hrrq_end[i] =
5270 pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
5271 pinstance->host_toggle_bit[i] = 1;
5272 }
5273}
5274
5275/**
5276 * pmcraid_init_instance - initialize per instance data structure
5277 * @pdev: pointer to pci device structure
5278 * @host: pointer to Scsi_Host structure
5279 * @mapped_pci_addr: memory mapped IOA configuration registers
5280 *
5281 * Return Value
5282 * 0 on success, non-zero in case of any failure
5283 */
5284static int __devinit pmcraid_init_instance(
5285 struct pci_dev *pdev,
5286 struct Scsi_Host *host,
5287 void __iomem *mapped_pci_addr
5288)
5289{
5290 struct pmcraid_instance *pinstance =
5291 (struct pmcraid_instance *)host->hostdata;
5292
5293 pinstance->host = host;
5294 pinstance->pdev = pdev;
5295
5296 /* Initialize register addresses */
5297 pinstance->mapped_dma_addr = mapped_pci_addr;
5298
5299 /* Initialize chip-specific details */
5300 {
5301 struct pmcraid_chip_details *chip_cfg = pinstance->chip_cfg;
5302 struct pmcraid_interrupts *pint_regs = &pinstance->int_regs;
5303
5304 pinstance->ioarrin = mapped_pci_addr + chip_cfg->ioarrin;
5305
5306 pint_regs->ioa_host_interrupt_reg =
5307 mapped_pci_addr + chip_cfg->ioa_host_intr;
5308 pint_regs->ioa_host_interrupt_clr_reg =
5309 mapped_pci_addr + chip_cfg->ioa_host_intr_clr;
5310 pint_regs->ioa_host_msix_interrupt_reg =
5311 mapped_pci_addr + chip_cfg->ioa_host_msix_intr;
5312 pint_regs->host_ioa_interrupt_reg =
5313 mapped_pci_addr + chip_cfg->host_ioa_intr;
5314 pint_regs->host_ioa_interrupt_clr_reg =
5315 mapped_pci_addr + chip_cfg->host_ioa_intr_clr;
5316
5317 /* Current version of firmware exposes interrupt mask set
5318 * and mask clr registers through memory mapped bar0.
5319 */
5320 pinstance->mailbox = mapped_pci_addr + chip_cfg->mailbox;
5321 pinstance->ioa_status = mapped_pci_addr + chip_cfg->ioastatus;
5322 pint_regs->ioa_host_interrupt_mask_reg =
5323 mapped_pci_addr + chip_cfg->ioa_host_mask;
5324 pint_regs->ioa_host_interrupt_mask_clr_reg =
5325 mapped_pci_addr + chip_cfg->ioa_host_mask_clr;
5326 pint_regs->global_interrupt_mask_reg =
5327 mapped_pci_addr + chip_cfg->global_intr_mask;
5328 };
5329
5330 pinstance->ioa_reset_attempts = 0;
5331 init_waitqueue_head(&pinstance->reset_wait_q);
5332
5333 atomic_set(&pinstance->outstanding_cmds, 0);
5334 atomic_set(&pinstance->last_message_id, 0);
5335 atomic_set(&pinstance->expose_resources, 0);
5336
5337 INIT_LIST_HEAD(&pinstance->free_res_q);
5338 INIT_LIST_HEAD(&pinstance->used_res_q);
5339 INIT_LIST_HEAD(&pinstance->free_cmd_pool);
5340 INIT_LIST_HEAD(&pinstance->pending_cmd_pool);
5341
5342 spin_lock_init(&pinstance->free_pool_lock);
5343 spin_lock_init(&pinstance->pending_pool_lock);
5344 spin_lock_init(&pinstance->resource_lock);
5345 mutex_init(&pinstance->aen_queue_lock);
5346
5347 /* Work-queue (Shared) for deferred processing error handling */
5348 INIT_WORK(&pinstance->worker_q, pmcraid_worker_function);
5349
5350 /* Initialize the default log_level */
5351 pinstance->current_log_level = pmcraid_log_level;
5352
5353 /* Setup variables required for reset engine */
5354 pinstance->ioa_state = IOA_STATE_UNKNOWN;
5355 pinstance->reset_cmd = NULL;
5356 return 0;
5357}
5358
5359/**
5360 * pmcraid_shutdown - shutdown adapter controller.
5361 * @pdev: pci device struct
5362 *
5363 * Issues an adapter shutdown to the card waits for its completion
5364 *
5365 * Return value
5366 * none
5367 */
5368static void pmcraid_shutdown(struct pci_dev *pdev)
5369{
5370 struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5371 pmcraid_reset_bringdown(pinstance);
5372}
5373
5374
5375/**
5376 * pmcraid_get_minor - returns unused minor number from minor number bitmap
5377 */
5378static unsigned short pmcraid_get_minor(void)
5379{
5380 int minor;
5381
5382 minor = find_first_zero_bit(pmcraid_minor, sizeof(pmcraid_minor));
5383 __set_bit(minor, pmcraid_minor);
5384 return minor;
5385}
5386
5387/**
5388 * pmcraid_release_minor - releases given minor back to minor number bitmap
5389 */
5390static void pmcraid_release_minor(unsigned short minor)
5391{
5392 __clear_bit(minor, pmcraid_minor);
5393}
5394
5395/**
5396 * pmcraid_setup_chrdev - allocates a minor number and registers a char device
5397 *
5398 * @pinstance: pointer to adapter instance for which to register device
5399 *
5400 * Return value
5401 * 0 in case of success, otherwise non-zero
5402 */
5403static int pmcraid_setup_chrdev(struct pmcraid_instance *pinstance)
5404{
5405 int minor;
5406 int error;
5407
5408 minor = pmcraid_get_minor();
5409 cdev_init(&pinstance->cdev, &pmcraid_fops);
5410 pinstance->cdev.owner = THIS_MODULE;
5411
5412 error = cdev_add(&pinstance->cdev, MKDEV(pmcraid_major, minor), 1);
5413
5414 if (error)
5415 pmcraid_release_minor(minor);
5416 else
5417 device_create(pmcraid_class, NULL, MKDEV(pmcraid_major, minor),
5418 NULL, "%s%u", PMCRAID_DEVFILE, minor);
5419 return error;
5420}
5421
5422/**
5423 * pmcraid_release_chrdev - unregisters per-adapter management interface
5424 *
5425 * @pinstance: pointer to adapter instance structure
5426 *
5427 * Return value
5428 * none
5429 */
5430static void pmcraid_release_chrdev(struct pmcraid_instance *pinstance)
5431{
5432 pmcraid_release_minor(MINOR(pinstance->cdev.dev));
5433 device_destroy(pmcraid_class,
5434 MKDEV(pmcraid_major, MINOR(pinstance->cdev.dev)));
5435 cdev_del(&pinstance->cdev);
5436}
5437
5438/**
5439 * pmcraid_remove - IOA hot plug remove entry point
5440 * @pdev: pci device struct
5441 *
5442 * Return value
5443 * none
5444 */
5445static void __devexit pmcraid_remove(struct pci_dev *pdev)
5446{
5447 struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5448
5449 /* remove the management interface (/dev file) for this device */
5450 pmcraid_release_chrdev(pinstance);
5451
5452 /* remove host template from scsi midlayer */
5453 scsi_remove_host(pinstance->host);
5454
5455 /* block requests from mid-layer */
5456 scsi_block_requests(pinstance->host);
5457
5458 /* initiate shutdown adapter */
5459 pmcraid_shutdown(pdev);
5460
5461 pmcraid_disable_interrupts(pinstance, ~0);
5462 flush_work_sync(&pinstance->worker_q);
5463
5464 pmcraid_kill_tasklets(pinstance);
5465 pmcraid_unregister_interrupt_handler(pinstance);
5466 pmcraid_release_buffers(pinstance);
5467 iounmap(pinstance->mapped_dma_addr);
5468 pci_release_regions(pdev);
5469 scsi_host_put(pinstance->host);
5470 pci_disable_device(pdev);
5471
5472 return;
5473}
5474
5475#ifdef CONFIG_PM
5476/**
5477 * pmcraid_suspend - driver suspend entry point for power management
5478 * @pdev: PCI device structure
5479 * @state: PCI power state to suspend routine
5480 *
5481 * Return Value - 0 always
5482 */
5483static int pmcraid_suspend(struct pci_dev *pdev, pm_message_t state)
5484{
5485 struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5486
5487 pmcraid_shutdown(pdev);
5488 pmcraid_disable_interrupts(pinstance, ~0);
5489 pmcraid_kill_tasklets(pinstance);
5490 pci_set_drvdata(pinstance->pdev, pinstance);
5491 pmcraid_unregister_interrupt_handler(pinstance);
5492 pci_save_state(pdev);
5493 pci_disable_device(pdev);
5494 pci_set_power_state(pdev, pci_choose_state(pdev, state));
5495
5496 return 0;
5497}
5498
5499/**
5500 * pmcraid_resume - driver resume entry point PCI power management
5501 * @pdev: PCI device structure
5502 *
5503 * Return Value - 0 in case of success. Error code in case of any failure
5504 */
5505static int pmcraid_resume(struct pci_dev *pdev)
5506{
5507 struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5508 struct Scsi_Host *host = pinstance->host;
5509 int rc;
5510
5511 pci_set_power_state(pdev, PCI_D0);
5512 pci_enable_wake(pdev, PCI_D0, 0);
5513 pci_restore_state(pdev);
5514
5515 rc = pci_enable_device(pdev);
5516
5517 if (rc) {
5518 dev_err(&pdev->dev, "resume: Enable device failed\n");
5519 return rc;
5520 }
5521
5522 pci_set_master(pdev);
5523
5524 if ((sizeof(dma_addr_t) == 4) ||
5525 pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
5526 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
5527
5528 if (rc == 0)
5529 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
5530
5531 if (rc != 0) {
5532 dev_err(&pdev->dev, "resume: Failed to set PCI DMA mask\n");
5533 goto disable_device;
5534 }
5535
5536 pmcraid_disable_interrupts(pinstance, ~0);
5537 atomic_set(&pinstance->outstanding_cmds, 0);
5538 rc = pmcraid_register_interrupt_handler(pinstance);
5539
5540 if (rc) {
5541 dev_err(&pdev->dev,
5542 "resume: couldn't register interrupt handlers\n");
5543 rc = -ENODEV;
5544 goto release_host;
5545 }
5546
5547 pmcraid_init_tasklets(pinstance);
5548 pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
5549
5550 /* Start with hard reset sequence which brings up IOA to operational
5551 * state as well as completes the reset sequence.
5552 */
5553 pinstance->ioa_hard_reset = 1;
5554
5555 /* Start IOA firmware initialization and bring card to Operational
5556 * state.
5557 */
5558 if (pmcraid_reset_bringup(pinstance)) {
5559 dev_err(&pdev->dev, "couldn't initialize IOA\n");
5560 rc = -ENODEV;
5561 goto release_tasklets;
5562 }
5563
5564 return 0;
5565
5566release_tasklets:
5567 pmcraid_disable_interrupts(pinstance, ~0);
5568 pmcraid_kill_tasklets(pinstance);
5569 pmcraid_unregister_interrupt_handler(pinstance);
5570
5571release_host:
5572 scsi_host_put(host);
5573
5574disable_device:
5575 pci_disable_device(pdev);
5576
5577 return rc;
5578}
5579
5580#else
5581
5582#define pmcraid_suspend NULL
5583#define pmcraid_resume NULL
5584
5585#endif /* CONFIG_PM */
5586
5587/**
5588 * pmcraid_complete_ioa_reset - Called by either timer or tasklet during
5589 * completion of the ioa reset
5590 * @cmd: pointer to reset command block
5591 */
5592static void pmcraid_complete_ioa_reset(struct pmcraid_cmd *cmd)
5593{
5594 struct pmcraid_instance *pinstance = cmd->drv_inst;
5595 unsigned long flags;
5596
5597 spin_lock_irqsave(pinstance->host->host_lock, flags);
5598 pmcraid_ioa_reset(cmd);
5599 spin_unlock_irqrestore(pinstance->host->host_lock, flags);
5600 scsi_unblock_requests(pinstance->host);
5601 schedule_work(&pinstance->worker_q);
5602}
5603
5604/**
5605 * pmcraid_set_supported_devs - sends SET SUPPORTED DEVICES to IOAFP
5606 *
5607 * @cmd: pointer to pmcraid_cmd structure
5608 *
5609 * Return Value
5610 * 0 for success or non-zero for failure cases
5611 */
5612static void pmcraid_set_supported_devs(struct pmcraid_cmd *cmd)
5613{
5614 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5615 void (*cmd_done) (struct pmcraid_cmd *) = pmcraid_complete_ioa_reset;
5616
5617 pmcraid_reinit_cmdblk(cmd);
5618
5619 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5620 ioarcb->request_type = REQ_TYPE_IOACMD;
5621 ioarcb->cdb[0] = PMCRAID_SET_SUPPORTED_DEVICES;
5622 ioarcb->cdb[1] = ALL_DEVICES_SUPPORTED;
5623
5624 /* If this was called as part of resource table reinitialization due to
5625 * lost CCN, it is enough to return the command block back to free pool
5626 * as part of set_supported_devs completion function.
5627 */
5628 if (cmd->drv_inst->reinit_cfg_table) {
5629 cmd->drv_inst->reinit_cfg_table = 0;
5630 cmd->release = 1;
5631 cmd_done = pmcraid_reinit_cfgtable_done;
5632 }
5633
5634 /* we will be done with the reset sequence after set supported devices,
5635 * setup the done function to return the command block back to free
5636 * pool
5637 */
5638 pmcraid_send_cmd(cmd,
5639 cmd_done,
5640 PMCRAID_SET_SUP_DEV_TIMEOUT,
5641 pmcraid_timeout_handler);
5642 return;
5643}
5644
5645/**
5646 * pmcraid_set_timestamp - set the timestamp to IOAFP
5647 *
5648 * @cmd: pointer to pmcraid_cmd structure
5649 *
5650 * Return Value
5651 * 0 for success or non-zero for failure cases
5652 */
5653static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd)
5654{
5655 struct pmcraid_instance *pinstance = cmd->drv_inst;
5656 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5657 __be32 time_stamp_len = cpu_to_be32(PMCRAID_TIMESTAMP_LEN);
5658 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
5659
5660 struct timeval tv;
5661 __le64 timestamp;
5662
5663 do_gettimeofday(&tv);
5664 timestamp = tv.tv_sec * 1000;
5665
5666 pinstance->timestamp_data->timestamp[0] = (__u8)(timestamp);
5667 pinstance->timestamp_data->timestamp[1] = (__u8)((timestamp) >> 8);
5668 pinstance->timestamp_data->timestamp[2] = (__u8)((timestamp) >> 16);
5669 pinstance->timestamp_data->timestamp[3] = (__u8)((timestamp) >> 24);
5670 pinstance->timestamp_data->timestamp[4] = (__u8)((timestamp) >> 32);
5671 pinstance->timestamp_data->timestamp[5] = (__u8)((timestamp) >> 40);
5672
5673 pmcraid_reinit_cmdblk(cmd);
5674 ioarcb->request_type = REQ_TYPE_SCSI;
5675 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5676 ioarcb->cdb[0] = PMCRAID_SCSI_SET_TIMESTAMP;
5677 ioarcb->cdb[1] = PMCRAID_SCSI_SERVICE_ACTION;
5678 memcpy(&(ioarcb->cdb[6]), &time_stamp_len, sizeof(time_stamp_len));
5679
5680 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
5681 offsetof(struct pmcraid_ioarcb,
5682 add_data.u.ioadl[0]));
5683 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
5684 ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
5685
5686 ioarcb->request_flags0 |= NO_LINK_DESCS;
5687 ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
5688 ioarcb->data_transfer_length =
5689 cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
5690 ioadl = &(ioarcb->add_data.u.ioadl[0]);
5691 ioadl->flags = IOADL_FLAGS_LAST_DESC;
5692 ioadl->address = cpu_to_le64(pinstance->timestamp_data_baddr);
5693 ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
5694
5695 if (!pinstance->timestamp_error) {
5696 pinstance->timestamp_error = 0;
5697 pmcraid_send_cmd(cmd, pmcraid_set_supported_devs,
5698 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5699 } else {
5700 pmcraid_send_cmd(cmd, pmcraid_return_cmd,
5701 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5702 return;
5703 }
5704}
5705
5706
5707/**
5708 * pmcraid_init_res_table - Initialize the resource table
5709 * @cmd: pointer to pmcraid command struct
5710 *
5711 * This function looks through the existing resource table, comparing
5712 * it with the config table. This function will take care of old/new
5713 * devices and schedule adding/removing them from the mid-layer
5714 * as appropriate.
5715 *
5716 * Return value
5717 * None
5718 */
5719static void pmcraid_init_res_table(struct pmcraid_cmd *cmd)
5720{
5721 struct pmcraid_instance *pinstance = cmd->drv_inst;
5722 struct pmcraid_resource_entry *res, *temp;
5723 struct pmcraid_config_table_entry *cfgte;
5724 unsigned long lock_flags;
5725 int found, rc, i;
5726 u16 fw_version;
5727 LIST_HEAD(old_res);
5728
5729 if (pinstance->cfg_table->flags & MICROCODE_UPDATE_REQUIRED)
5730 pmcraid_err("IOA requires microcode download\n");
5731
5732 fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
5733
5734 /* resource list is protected by pinstance->resource_lock.
5735 * init_res_table can be called from probe (user-thread) or runtime
5736 * reset (timer/tasklet)
5737 */
5738 spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
5739
5740 list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue)
5741 list_move_tail(&res->queue, &old_res);
5742
5743 for (i = 0; i < pinstance->cfg_table->num_entries; i++) {
5744 if (be16_to_cpu(pinstance->inq_data->fw_version) <=
5745 PMCRAID_FW_VERSION_1)
5746 cfgte = &pinstance->cfg_table->entries[i];
5747 else
5748 cfgte = (struct pmcraid_config_table_entry *)
5749 &pinstance->cfg_table->entries_ext[i];
5750
5751 if (!pmcraid_expose_resource(fw_version, cfgte))
5752 continue;
5753
5754 found = 0;
5755
5756 /* If this entry was already detected and initialized */
5757 list_for_each_entry_safe(res, temp, &old_res, queue) {
5758
5759 rc = memcmp(&res->cfg_entry.resource_address,
5760 &cfgte->resource_address,
5761 sizeof(cfgte->resource_address));
5762 if (!rc) {
5763 list_move_tail(&res->queue,
5764 &pinstance->used_res_q);
5765 found = 1;
5766 break;
5767 }
5768 }
5769
5770 /* If this is new entry, initialize it and add it the queue */
5771 if (!found) {
5772
5773 if (list_empty(&pinstance->free_res_q)) {
5774 pmcraid_err("Too many devices attached\n");
5775 break;
5776 }
5777
5778 found = 1;
5779 res = list_entry(pinstance->free_res_q.next,
5780 struct pmcraid_resource_entry, queue);
5781
5782 res->scsi_dev = NULL;
5783 res->change_detected = RES_CHANGE_ADD;
5784 res->reset_progress = 0;
5785 list_move_tail(&res->queue, &pinstance->used_res_q);
5786 }
5787
5788 /* copy new configuration table entry details into driver
5789 * maintained resource entry
5790 */
5791 if (found) {
5792 memcpy(&res->cfg_entry, cfgte,
5793 pinstance->config_table_entry_size);
5794 pmcraid_info("New res type:%x, vset:%x, addr:%x:\n",
5795 res->cfg_entry.resource_type,
5796 (fw_version <= PMCRAID_FW_VERSION_1 ?
5797 res->cfg_entry.unique_flags1 :
5798 res->cfg_entry.array_id & 0xFF),
5799 le32_to_cpu(res->cfg_entry.resource_address));
5800 }
5801 }
5802
5803 /* Detect any deleted entries, mark them for deletion from mid-layer */
5804 list_for_each_entry_safe(res, temp, &old_res, queue) {
5805
5806 if (res->scsi_dev) {
5807 res->change_detected = RES_CHANGE_DEL;
5808 res->cfg_entry.resource_handle =
5809 PMCRAID_INVALID_RES_HANDLE;
5810 list_move_tail(&res->queue, &pinstance->used_res_q);
5811 } else {
5812 list_move_tail(&res->queue, &pinstance->free_res_q);
5813 }
5814 }
5815
5816 /* release the resource list lock */
5817 spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
5818 pmcraid_set_timestamp(cmd);
5819}
5820
5821/**
5822 * pmcraid_querycfg - Send a Query IOA Config to the adapter.
5823 * @cmd: pointer pmcraid_cmd struct
5824 *
5825 * This function sends a Query IOA Configuration command to the adapter to
5826 * retrieve the IOA configuration table.
5827 *
5828 * Return value:
5829 * none
5830 */
5831static void pmcraid_querycfg(struct pmcraid_cmd *cmd)
5832{
5833 struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5834 struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
5835 struct pmcraid_instance *pinstance = cmd->drv_inst;
5836 int cfg_table_size = cpu_to_be32(sizeof(struct pmcraid_config_table));
5837
5838 if (be16_to_cpu(pinstance->inq_data->fw_version) <=
5839 PMCRAID_FW_VERSION_1)
5840 pinstance->config_table_entry_size =
5841 sizeof(struct pmcraid_config_table_entry);
5842 else
5843 pinstance->config_table_entry_size =
5844 sizeof(struct pmcraid_config_table_entry_ext);
5845
5846 ioarcb->request_type = REQ_TYPE_IOACMD;
5847 ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5848
5849 ioarcb->cdb[0] = PMCRAID_QUERY_IOA_CONFIG;
5850
5851 /* firmware requires 4-byte length field, specified in B.E format */
5852 memcpy(&(ioarcb->cdb[10]), &cfg_table_size, sizeof(cfg_table_size));
5853
5854 /* Since entire config table can be described by single IOADL, it can
5855 * be part of IOARCB itself
5856 */
5857 ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
5858 offsetof(struct pmcraid_ioarcb,
5859 add_data.u.ioadl[0]));
5860 ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
5861 ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
5862
5863 ioarcb->request_flags0 |= NO_LINK_DESCS;
5864 ioarcb->data_transfer_length =
5865 cpu_to_le32(sizeof(struct pmcraid_config_table));
5866
5867 ioadl = &(ioarcb->add_data.u.ioadl[0]);
5868 ioadl->flags = IOADL_FLAGS_LAST_DESC;
5869 ioadl->address = cpu_to_le64(pinstance->cfg_table_bus_addr);
5870 ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_config_table));
5871
5872 pmcraid_send_cmd(cmd, pmcraid_init_res_table,
5873 PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5874}
5875
5876
5877/**
5878 * pmcraid_probe - PCI probe entry pointer for PMC MaxRAID controller driver
5879 * @pdev: pointer to pci device structure
5880 * @dev_id: pointer to device ids structure
5881 *
5882 * Return Value
5883 * returns 0 if the device is claimed and successfully configured.
5884 * returns non-zero error code in case of any failure
5885 */
5886static int __devinit pmcraid_probe(
5887 struct pci_dev *pdev,
5888 const struct pci_device_id *dev_id
5889)
5890{
5891 struct pmcraid_instance *pinstance;
5892 struct Scsi_Host *host;
5893 void __iomem *mapped_pci_addr;
5894 int rc = PCIBIOS_SUCCESSFUL;
5895
5896 if (atomic_read(&pmcraid_adapter_count) >= PMCRAID_MAX_ADAPTERS) {
5897 pmcraid_err
5898 ("maximum number(%d) of supported adapters reached\n",
5899 atomic_read(&pmcraid_adapter_count));
5900 return -ENOMEM;
5901 }
5902
5903 atomic_inc(&pmcraid_adapter_count);
5904 rc = pci_enable_device(pdev);
5905
5906 if (rc) {
5907 dev_err(&pdev->dev, "Cannot enable adapter\n");
5908 atomic_dec(&pmcraid_adapter_count);
5909 return rc;
5910 }
5911
5912 dev_info(&pdev->dev,
5913 "Found new IOA(%x:%x), Total IOA count: %d\n",
5914 pdev->vendor, pdev->device,
5915 atomic_read(&pmcraid_adapter_count));
5916
5917 rc = pci_request_regions(pdev, PMCRAID_DRIVER_NAME);
5918
5919 if (rc < 0) {
5920 dev_err(&pdev->dev,
5921 "Couldn't register memory range of registers\n");
5922 goto out_disable_device;
5923 }
5924
5925 mapped_pci_addr = pci_iomap(pdev, 0, 0);
5926
5927 if (!mapped_pci_addr) {
5928 dev_err(&pdev->dev, "Couldn't map PCI registers memory\n");
5929 rc = -ENOMEM;
5930 goto out_release_regions;
5931 }
5932
5933 pci_set_master(pdev);
5934
5935 /* Firmware requires the system bus address of IOARCB to be within
5936 * 32-bit addressable range though it has 64-bit IOARRIN register.
5937 * However, firmware supports 64-bit streaming DMA buffers, whereas
5938 * coherent buffers are to be 32-bit. Since pci_alloc_consistent always
5939 * returns memory within 4GB (if not, change this logic), coherent
5940 * buffers are within firmware acceptable address ranges.
5941 */
5942 if ((sizeof(dma_addr_t) == 4) ||
5943 pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
5944 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
5945
5946 /* firmware expects 32-bit DMA addresses for IOARRIN register; set 32
5947 * bit mask for pci_alloc_consistent to return addresses within 4GB
5948 */
5949 if (rc == 0)
5950 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
5951
5952 if (rc != 0) {
5953 dev_err(&pdev->dev, "Failed to set PCI DMA mask\n");
5954 goto cleanup_nomem;
5955 }
5956
5957 host = scsi_host_alloc(&pmcraid_host_template,
5958 sizeof(struct pmcraid_instance));
5959
5960 if (!host) {
5961 dev_err(&pdev->dev, "scsi_host_alloc failed!\n");
5962 rc = -ENOMEM;
5963 goto cleanup_nomem;
5964 }
5965
5966 host->max_id = PMCRAID_MAX_NUM_TARGETS_PER_BUS;
5967 host->max_lun = PMCRAID_MAX_NUM_LUNS_PER_TARGET;
5968 host->unique_id = host->host_no;
5969 host->max_channel = PMCRAID_MAX_BUS_TO_SCAN;
5970 host->max_cmd_len = PMCRAID_MAX_CDB_LEN;
5971
5972 /* zero out entire instance structure */
5973 pinstance = (struct pmcraid_instance *)host->hostdata;
5974 memset(pinstance, 0, sizeof(*pinstance));
5975
5976 pinstance->chip_cfg =
5977 (struct pmcraid_chip_details *)(dev_id->driver_data);
5978
5979 rc = pmcraid_init_instance(pdev, host, mapped_pci_addr);
5980
5981 if (rc < 0) {
5982 dev_err(&pdev->dev, "failed to initialize adapter instance\n");
5983 goto out_scsi_host_put;
5984 }
5985
5986 pci_set_drvdata(pdev, pinstance);
5987
5988 /* Save PCI config-space for use following the reset */
5989 rc = pci_save_state(pinstance->pdev);
5990
5991 if (rc != 0) {
5992 dev_err(&pdev->dev, "Failed to save PCI config space\n");
5993 goto out_scsi_host_put;
5994 }
5995
5996 pmcraid_disable_interrupts(pinstance, ~0);
5997
5998 rc = pmcraid_register_interrupt_handler(pinstance);
5999
6000 if (rc) {
6001 dev_err(&pdev->dev, "couldn't register interrupt handler\n");
6002 goto out_scsi_host_put;
6003 }
6004
6005 pmcraid_init_tasklets(pinstance);
6006
6007 /* allocate verious buffers used by LLD.*/
6008 rc = pmcraid_init_buffers(pinstance);
6009
6010 if (rc) {
6011 pmcraid_err("couldn't allocate memory blocks\n");
6012 goto out_unregister_isr;
6013 }
6014
6015 /* check the reset type required */
6016 pmcraid_reset_type(pinstance);
6017
6018 pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
6019
6020 /* Start IOA firmware initialization and bring card to Operational
6021 * state.
6022 */
6023 pmcraid_info("starting IOA initialization sequence\n");
6024 if (pmcraid_reset_bringup(pinstance)) {
6025 dev_err(&pdev->dev, "couldn't initialize IOA\n");
6026 rc = 1;
6027 goto out_release_bufs;
6028 }
6029
6030 /* Add adapter instance into mid-layer list */
6031 rc = scsi_add_host(pinstance->host, &pdev->dev);
6032 if (rc != 0) {
6033 pmcraid_err("couldn't add host into mid-layer: %d\n", rc);
6034 goto out_release_bufs;
6035 }
6036
6037 scsi_scan_host(pinstance->host);
6038
6039 rc = pmcraid_setup_chrdev(pinstance);
6040
6041 if (rc != 0) {
6042 pmcraid_err("couldn't create mgmt interface, error: %x\n",
6043 rc);
6044 goto out_remove_host;
6045 }
6046
6047 /* Schedule worker thread to handle CCN and take care of adding and
6048 * removing devices to OS
6049 */
6050 atomic_set(&pinstance->expose_resources, 1);
6051 schedule_work(&pinstance->worker_q);
6052 return rc;
6053
6054out_remove_host:
6055 scsi_remove_host(host);
6056
6057out_release_bufs:
6058 pmcraid_release_buffers(pinstance);
6059
6060out_unregister_isr:
6061 pmcraid_kill_tasklets(pinstance);
6062 pmcraid_unregister_interrupt_handler(pinstance);
6063
6064out_scsi_host_put:
6065 scsi_host_put(host);
6066
6067cleanup_nomem:
6068 iounmap(mapped_pci_addr);
6069
6070out_release_regions:
6071 pci_release_regions(pdev);
6072
6073out_disable_device:
6074 atomic_dec(&pmcraid_adapter_count);
6075 pci_set_drvdata(pdev, NULL);
6076 pci_disable_device(pdev);
6077 return -ENODEV;
6078}
6079
6080/*
6081 * PCI driver structure of pcmraid driver
6082 */
6083static struct pci_driver pmcraid_driver = {
6084 .name = PMCRAID_DRIVER_NAME,
6085 .id_table = pmcraid_pci_table,
6086 .probe = pmcraid_probe,
6087 .remove = pmcraid_remove,
6088 .suspend = pmcraid_suspend,
6089 .resume = pmcraid_resume,
6090 .shutdown = pmcraid_shutdown
6091};
6092
6093/**
6094 * pmcraid_init - module load entry point
6095 */
6096static int __init pmcraid_init(void)
6097{
6098 dev_t dev;
6099 int error;
6100
6101 pmcraid_info("%s Device Driver version: %s\n",
6102 PMCRAID_DRIVER_NAME, PMCRAID_DRIVER_VERSION);
6103
6104 error = alloc_chrdev_region(&dev, 0,
6105 PMCRAID_MAX_ADAPTERS,
6106 PMCRAID_DEVFILE);
6107
6108 if (error) {
6109 pmcraid_err("failed to get a major number for adapters\n");
6110 goto out_init;
6111 }
6112
6113 pmcraid_major = MAJOR(dev);
6114 pmcraid_class = class_create(THIS_MODULE, PMCRAID_DEVFILE);
6115
6116 if (IS_ERR(pmcraid_class)) {
6117 error = PTR_ERR(pmcraid_class);
6118 pmcraid_err("failed to register with with sysfs, error = %x\n",
6119 error);
6120 goto out_unreg_chrdev;
6121 }
6122
6123 error = pmcraid_netlink_init();
6124
6125 if (error)
6126 goto out_unreg_chrdev;
6127
6128 error = pci_register_driver(&pmcraid_driver);
6129
6130 if (error == 0)
6131 goto out_init;
6132
6133 pmcraid_err("failed to register pmcraid driver, error = %x\n",
6134 error);
6135 class_destroy(pmcraid_class);
6136 pmcraid_netlink_release();
6137
6138out_unreg_chrdev:
6139 unregister_chrdev_region(MKDEV(pmcraid_major, 0), PMCRAID_MAX_ADAPTERS);
6140
6141out_init:
6142 return error;
6143}
6144
6145/**
6146 * pmcraid_exit - module unload entry point
6147 */
6148static void __exit pmcraid_exit(void)
6149{
6150 pmcraid_netlink_release();
6151 unregister_chrdev_region(MKDEV(pmcraid_major, 0),
6152 PMCRAID_MAX_ADAPTERS);
6153 pci_unregister_driver(&pmcraid_driver);
6154 class_destroy(pmcraid_class);
6155}
6156
6157module_init(pmcraid_init);
6158module_exit(pmcraid_exit);