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