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