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