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