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