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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * scsi_error.c Copyright (C) 1997 Eric Youngdale | |
4 | * | |
5 | * SCSI error/timeout handling | |
6 | * Initial versions: Eric Youngdale. Based upon conversations with | |
0bf8c869 | 7 | * Leonard Zubkoff and David Miller at Linux Expo, |
1da177e4 LT |
8 | * ideas originating from all over the place. |
9 | * | |
10 | * Restructured scsi_unjam_host and associated functions. | |
11 | * September 04, 2002 Mike Anderson (andmike@us.ibm.com) | |
12 | * | |
13 | * Forward port of Russell King's (rmk@arm.linux.org.uk) changes and | |
0bf8c869 | 14 | * minor cleanups. |
1da177e4 LT |
15 | * September 30, 2002 Mike Anderson (andmike@us.ibm.com) |
16 | */ | |
17 | ||
18 | #include <linux/module.h> | |
19 | #include <linux/sched.h> | |
5a0e3ad6 | 20 | #include <linux/gfp.h> |
1da177e4 LT |
21 | #include <linux/timer.h> |
22 | #include <linux/string.h> | |
1da177e4 | 23 | #include <linux/kernel.h> |
83144186 | 24 | #include <linux/freezer.h> |
c5478def | 25 | #include <linux/kthread.h> |
1da177e4 LT |
26 | #include <linux/interrupt.h> |
27 | #include <linux/blkdev.h> | |
28 | #include <linux/delay.h> | |
fc73648a | 29 | #include <linux/jiffies.h> |
1da177e4 LT |
30 | |
31 | #include <scsi/scsi.h> | |
beb40487 | 32 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
33 | #include <scsi/scsi_dbg.h> |
34 | #include <scsi/scsi_device.h> | |
18a4d0a2 | 35 | #include <scsi/scsi_driver.h> |
1da177e4 | 36 | #include <scsi/scsi_eh.h> |
7708c165 | 37 | #include <scsi/scsi_common.h> |
c829c394 | 38 | #include <scsi/scsi_transport.h> |
1da177e4 LT |
39 | #include <scsi/scsi_host.h> |
40 | #include <scsi/scsi_ioctl.h> | |
ee14c674 | 41 | #include <scsi/scsi_dh.h> |
29cfc2ab | 42 | #include <scsi/scsi_devinfo.h> |
176aa9d6 | 43 | #include <scsi/sg.h> |
1da177e4 LT |
44 | |
45 | #include "scsi_priv.h" | |
46 | #include "scsi_logging.h" | |
79ee8304 | 47 | #include "scsi_transport_api.h" |
1da177e4 | 48 | |
bf816235 KT |
49 | #include <trace/events/scsi.h> |
50 | ||
2908769c DLM |
51 | #include <asm/unaligned.h> |
52 | ||
14216561 JB |
53 | static void scsi_eh_done(struct scsi_cmnd *scmd); |
54 | ||
1da177e4 LT |
55 | /* |
56 | * These should *probably* be handled by the host itself. | |
57 | * Since it is allowed to sleep, it probably should. | |
58 | */ | |
59 | #define BUS_RESET_SETTLE_TIME (10) | |
60 | #define HOST_RESET_SETTLE_TIME (10) | |
61 | ||
3eef6257 | 62 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd); |
e494f6a7 HR |
63 | static int scsi_try_to_abort_cmd(struct scsi_host_template *, |
64 | struct scsi_cmnd *); | |
3eef6257 | 65 | |
1da177e4 LT |
66 | void scsi_eh_wakeup(struct Scsi_Host *shost) |
67 | { | |
f0317e88 BVA |
68 | lockdep_assert_held(shost->host_lock); |
69 | ||
c84b023a | 70 | if (scsi_host_busy(shost) == shost->host_failed) { |
bf816235 | 71 | trace_scsi_eh_wakeup(shost); |
3ed7a470 | 72 | wake_up_process(shost->ehandler); |
91921e01 HR |
73 | SCSI_LOG_ERROR_RECOVERY(5, shost_printk(KERN_INFO, shost, |
74 | "Waking error handler thread\n")); | |
1da177e4 LT |
75 | } |
76 | } | |
f8bbfc24 TH |
77 | |
78 | /** | |
79 | * scsi_schedule_eh - schedule EH for SCSI host | |
80 | * @shost: SCSI host to invoke error handling on. | |
81 | * | |
82 | * Schedule SCSI EH without scmd. | |
dc8875e1 | 83 | */ |
f8bbfc24 TH |
84 | void scsi_schedule_eh(struct Scsi_Host *shost) |
85 | { | |
86 | unsigned long flags; | |
87 | ||
88 | spin_lock_irqsave(shost->host_lock, flags); | |
89 | ||
90 | if (scsi_host_set_state(shost, SHOST_RECOVERY) == 0 || | |
91 | scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY) == 0) { | |
92 | shost->host_eh_scheduled++; | |
93 | scsi_eh_wakeup(shost); | |
94 | } | |
95 | ||
96 | spin_unlock_irqrestore(shost->host_lock, flags); | |
97 | } | |
98 | EXPORT_SYMBOL_GPL(scsi_schedule_eh); | |
1da177e4 | 99 | |
b4562022 HR |
100 | static int scsi_host_eh_past_deadline(struct Scsi_Host *shost) |
101 | { | |
bb3b621a | 102 | if (!shost->last_reset || shost->eh_deadline == -1) |
b4562022 HR |
103 | return 0; |
104 | ||
76ad3e59 HR |
105 | /* |
106 | * 32bit accesses are guaranteed to be atomic | |
107 | * (on all supported architectures), so instead | |
108 | * of using a spinlock we can as well double check | |
bb3b621a | 109 | * if eh_deadline has been set to 'off' during the |
76ad3e59 HR |
110 | * time_before call. |
111 | */ | |
112 | if (time_before(jiffies, shost->last_reset + shost->eh_deadline) && | |
bb3b621a | 113 | shost->eh_deadline > -1) |
b4562022 HR |
114 | return 0; |
115 | ||
116 | return 1; | |
117 | } | |
118 | ||
e494f6a7 HR |
119 | /** |
120 | * scmd_eh_abort_handler - Handle command aborts | |
121 | * @work: command to be aborted. | |
923f46f9 BVA |
122 | * |
123 | * Note: this function must be called only for a command that has timed out. | |
124 | * Because the block layer marks a request as complete before it calls | |
125 | * scsi_times_out(), a .scsi_done() call from the LLD for a command that has | |
126 | * timed out do not have any effect. Hence it is safe to call | |
127 | * scsi_finish_command() from this function. | |
e494f6a7 HR |
128 | */ |
129 | void | |
130 | scmd_eh_abort_handler(struct work_struct *work) | |
131 | { | |
132 | struct scsi_cmnd *scmd = | |
133 | container_of(work, struct scsi_cmnd, abort_work.work); | |
134 | struct scsi_device *sdev = scmd->device; | |
e494f6a7 HR |
135 | int rtn; |
136 | ||
e494f6a7 | 137 | if (scsi_host_eh_past_deadline(sdev->host)) { |
e494f6a7 HR |
138 | SCSI_LOG_ERROR_RECOVERY(3, |
139 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 140 | "eh timeout, not aborting\n")); |
e494f6a7 | 141 | } else { |
e494f6a7 HR |
142 | SCSI_LOG_ERROR_RECOVERY(3, |
143 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 144 | "aborting command\n")); |
e494f6a7 HR |
145 | rtn = scsi_try_to_abort_cmd(sdev->host->hostt, scmd); |
146 | if (rtn == SUCCESS) { | |
8922a908 | 147 | set_host_byte(scmd, DID_TIME_OUT); |
bb3b621a RM |
148 | if (scsi_host_eh_past_deadline(sdev->host)) { |
149 | SCSI_LOG_ERROR_RECOVERY(3, | |
150 | scmd_printk(KERN_INFO, scmd, | |
470613b4 HR |
151 | "eh timeout, not retrying " |
152 | "aborted command\n")); | |
bb3b621a | 153 | } else if (!scsi_noretry_cmd(scmd) && |
e494f6a7 HR |
154 | (++scmd->retries <= scmd->allowed)) { |
155 | SCSI_LOG_ERROR_RECOVERY(3, | |
156 | scmd_printk(KERN_WARNING, scmd, | |
470613b4 | 157 | "retry aborted command\n")); |
e494f6a7 | 158 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); |
bb3b621a | 159 | return; |
e494f6a7 HR |
160 | } else { |
161 | SCSI_LOG_ERROR_RECOVERY(3, | |
162 | scmd_printk(KERN_WARNING, scmd, | |
470613b4 | 163 | "finish aborted command\n")); |
e494f6a7 | 164 | scsi_finish_command(scmd); |
bb3b621a | 165 | return; |
e494f6a7 | 166 | } |
bb3b621a RM |
167 | } else { |
168 | SCSI_LOG_ERROR_RECOVERY(3, | |
169 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 170 | "cmd abort %s\n", |
883a030f HR |
171 | (rtn == FAST_IO_FAIL) ? |
172 | "not send" : "failed")); | |
e494f6a7 | 173 | } |
e494f6a7 HR |
174 | } |
175 | ||
a0658632 | 176 | scsi_eh_scmd_add(scmd); |
e494f6a7 HR |
177 | } |
178 | ||
179 | /** | |
180 | * scsi_abort_command - schedule a command abort | |
181 | * @scmd: scmd to abort. | |
182 | * | |
183 | * We only need to abort commands after a command timeout | |
184 | */ | |
185 | static int | |
186 | scsi_abort_command(struct scsi_cmnd *scmd) | |
187 | { | |
188 | struct scsi_device *sdev = scmd->device; | |
189 | struct Scsi_Host *shost = sdev->host; | |
190 | unsigned long flags; | |
191 | ||
192 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) { | |
193 | /* | |
194 | * Retry after abort failed, escalate to next level. | |
195 | */ | |
196 | SCSI_LOG_ERROR_RECOVERY(3, | |
197 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 198 | "previous abort failed\n")); |
fcc95a76 | 199 | BUG_ON(delayed_work_pending(&scmd->abort_work)); |
e494f6a7 HR |
200 | return FAILED; |
201 | } | |
202 | ||
e494f6a7 | 203 | spin_lock_irqsave(shost->host_lock, flags); |
bb3b621a | 204 | if (shost->eh_deadline != -1 && !shost->last_reset) |
e494f6a7 HR |
205 | shost->last_reset = jiffies; |
206 | spin_unlock_irqrestore(shost->host_lock, flags); | |
207 | ||
208 | scmd->eh_eflags |= SCSI_EH_ABORT_SCHEDULED; | |
209 | SCSI_LOG_ERROR_RECOVERY(3, | |
470613b4 | 210 | scmd_printk(KERN_INFO, scmd, "abort scheduled\n")); |
e494f6a7 HR |
211 | queue_delayed_work(shost->tmf_work_q, &scmd->abort_work, HZ / 100); |
212 | return SUCCESS; | |
213 | } | |
214 | ||
1da177e4 | 215 | /** |
7a38dc0b | 216 | * scsi_eh_reset - call into ->eh_action to reset internal counters |
1da177e4 | 217 | * @scmd: scmd to run eh on. |
1da177e4 | 218 | * |
7a38dc0b HR |
219 | * The scsi driver might be carrying internal state about the |
220 | * devices, so we need to call into the driver to reset the | |
221 | * internal state once the error handler is started. | |
dc8875e1 | 222 | */ |
7a38dc0b HR |
223 | static void scsi_eh_reset(struct scsi_cmnd *scmd) |
224 | { | |
225 | if (!blk_rq_is_passthrough(scmd->request)) { | |
226 | struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd); | |
227 | if (sdrv->eh_reset) | |
228 | sdrv->eh_reset(scmd); | |
229 | } | |
230 | } | |
231 | ||
3bd6f43f BVA |
232 | static void scsi_eh_inc_host_failed(struct rcu_head *head) |
233 | { | |
3be8828f BVA |
234 | struct scsi_cmnd *scmd = container_of(head, typeof(*scmd), rcu); |
235 | struct Scsi_Host *shost = scmd->device->host; | |
3bd6f43f BVA |
236 | unsigned long flags; |
237 | ||
238 | spin_lock_irqsave(shost->host_lock, flags); | |
239 | shost->host_failed++; | |
240 | scsi_eh_wakeup(shost); | |
241 | spin_unlock_irqrestore(shost->host_lock, flags); | |
242 | } | |
243 | ||
1da177e4 LT |
244 | /** |
245 | * scsi_eh_scmd_add - add scsi cmd to error handling. | |
246 | * @scmd: scmd to run eh on. | |
dc8875e1 | 247 | */ |
a0658632 | 248 | void scsi_eh_scmd_add(struct scsi_cmnd *scmd) |
1da177e4 LT |
249 | { |
250 | struct Scsi_Host *shost = scmd->device->host; | |
251 | unsigned long flags; | |
2171b6d0 | 252 | int ret; |
1da177e4 | 253 | |
2171b6d0 | 254 | WARN_ON_ONCE(!shost->ehandler); |
1da177e4 LT |
255 | |
256 | spin_lock_irqsave(shost->host_lock, flags); | |
2171b6d0 HR |
257 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) { |
258 | ret = scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY); | |
259 | WARN_ON_ONCE(ret); | |
260 | } | |
bb3b621a | 261 | if (shost->eh_deadline != -1 && !shost->last_reset) |
b4562022 HR |
262 | shost->last_reset = jiffies; |
263 | ||
7a38dc0b | 264 | scsi_eh_reset(scmd); |
1da177e4 | 265 | list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q); |
1da177e4 | 266 | spin_unlock_irqrestore(shost->host_lock, flags); |
3bd6f43f BVA |
267 | /* |
268 | * Ensure that all tasks observe the host state change before the | |
269 | * host_failed change. | |
270 | */ | |
3be8828f | 271 | call_rcu(&scmd->rcu, scsi_eh_inc_host_failed); |
1da177e4 LT |
272 | } |
273 | ||
1da177e4 LT |
274 | /** |
275 | * scsi_times_out - Timeout function for normal scsi commands. | |
242f9dcb | 276 | * @req: request that is timing out. |
1da177e4 LT |
277 | * |
278 | * Notes: | |
279 | * We do not need to lock this. There is the potential for a race | |
280 | * only in that the normal completion handling might run, but if the | |
281 | * normal completion function determines that the timer has already | |
282 | * fired, then it mustn't do anything. | |
dc8875e1 | 283 | */ |
242f9dcb | 284 | enum blk_eh_timer_return scsi_times_out(struct request *req) |
1da177e4 | 285 | { |
bed2213d | 286 | struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(req); |
6600593c | 287 | enum blk_eh_timer_return rtn = BLK_EH_DONE; |
0bf8c869 | 288 | struct Scsi_Host *host = scmd->device->host; |
6c5f8ce1 | 289 | |
bf816235 | 290 | trace_scsi_dispatch_cmd_timeout(scmd); |
1da177e4 LT |
291 | scsi_log_completion(scmd, TIMEOUT_ERROR); |
292 | ||
bb3b621a | 293 | if (host->eh_deadline != -1 && !host->last_reset) |
b4562022 HR |
294 | host->last_reset = jiffies; |
295 | ||
b6a05c82 | 296 | if (host->hostt->eh_timed_out) |
0bf8c869 | 297 | rtn = host->hostt->eh_timed_out(scmd); |
1da177e4 | 298 | |
6600593c | 299 | if (rtn == BLK_EH_DONE) { |
065990bd | 300 | /* |
f1342709 KB |
301 | * Set the command to complete first in order to prevent a real |
302 | * completion from releasing the command while error handling | |
303 | * is using it. If the command was already completed, then the | |
304 | * lower level driver beat the timeout handler, and it is safe | |
305 | * to return without escalating error recovery. | |
065990bd | 306 | * |
f1342709 KB |
307 | * If timeout handling lost the race to a real completion, the |
308 | * block layer may ignore that due to a fake timeout injection, | |
309 | * so return RESET_TIMER to allow error handling another shot | |
310 | * at this command. | |
065990bd | 311 | */ |
f1342709 KB |
312 | if (test_and_set_bit(SCMD_STATE_COMPLETE, &scmd->state)) |
313 | return BLK_EH_RESET_TIMER; | |
a0658632 | 314 | if (scsi_abort_command(scmd) != SUCCESS) { |
2171b6d0 | 315 | set_host_byte(scmd, DID_TIME_OUT); |
a0658632 | 316 | scsi_eh_scmd_add(scmd); |
2171b6d0 | 317 | } |
a33c070b | 318 | } |
242f9dcb | 319 | |
fa990781 | 320 | return rtn; |
1da177e4 LT |
321 | } |
322 | ||
323 | /** | |
324 | * scsi_block_when_processing_errors - Prevent cmds from being queued. | |
325 | * @sdev: Device on which we are performing recovery. | |
326 | * | |
327 | * Description: | |
328 | * We block until the host is out of error recovery, and then check to | |
329 | * see whether the host or the device is offline. | |
330 | * | |
331 | * Return value: | |
332 | * 0 when dev was taken offline by error recovery. 1 OK to proceed. | |
dc8875e1 | 333 | */ |
1da177e4 LT |
334 | int scsi_block_when_processing_errors(struct scsi_device *sdev) |
335 | { | |
336 | int online; | |
337 | ||
939647ee | 338 | wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host)); |
1da177e4 LT |
339 | |
340 | online = scsi_device_online(sdev); | |
341 | ||
1da177e4 LT |
342 | return online; |
343 | } | |
344 | EXPORT_SYMBOL(scsi_block_when_processing_errors); | |
345 | ||
346 | #ifdef CONFIG_SCSI_LOGGING | |
347 | /** | |
348 | * scsi_eh_prt_fail_stats - Log info on failures. | |
349 | * @shost: scsi host being recovered. | |
350 | * @work_q: Queue of scsi cmds to process. | |
dc8875e1 | 351 | */ |
1da177e4 LT |
352 | static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost, |
353 | struct list_head *work_q) | |
354 | { | |
355 | struct scsi_cmnd *scmd; | |
356 | struct scsi_device *sdev; | |
357 | int total_failures = 0; | |
358 | int cmd_failed = 0; | |
359 | int cmd_cancel = 0; | |
360 | int devices_failed = 0; | |
361 | ||
362 | shost_for_each_device(sdev, shost) { | |
363 | list_for_each_entry(scmd, work_q, eh_entry) { | |
364 | if (scmd->device == sdev) { | |
365 | ++total_failures; | |
a0658632 | 366 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) |
1da177e4 | 367 | ++cmd_cancel; |
0bf8c869 | 368 | else |
1da177e4 LT |
369 | ++cmd_failed; |
370 | } | |
371 | } | |
372 | ||
373 | if (cmd_cancel || cmd_failed) { | |
374 | SCSI_LOG_ERROR_RECOVERY(3, | |
a3a790dc | 375 | shost_printk(KERN_INFO, shost, |
9ccfc756 | 376 | "%s: cmds failed: %d, cancel: %d\n", |
cadbd4a5 | 377 | __func__, cmd_failed, |
9ccfc756 | 378 | cmd_cancel)); |
1da177e4 LT |
379 | cmd_cancel = 0; |
380 | cmd_failed = 0; | |
381 | ++devices_failed; | |
382 | } | |
383 | } | |
384 | ||
91921e01 HR |
385 | SCSI_LOG_ERROR_RECOVERY(2, shost_printk(KERN_INFO, shost, |
386 | "Total of %d commands on %d" | |
387 | " devices require eh work\n", | |
0bf8c869 | 388 | total_failures, devices_failed)); |
1da177e4 LT |
389 | } |
390 | #endif | |
391 | ||
279afdfe EM |
392 | /** |
393 | * scsi_report_lun_change - Set flag on all *other* devices on the same target | |
394 | * to indicate that a UNIT ATTENTION is expected. | |
395 | * @sdev: Device reporting the UNIT ATTENTION | |
396 | */ | |
397 | static void scsi_report_lun_change(struct scsi_device *sdev) | |
398 | { | |
399 | sdev->sdev_target->expecting_lun_change = 1; | |
400 | } | |
401 | ||
402 | /** | |
403 | * scsi_report_sense - Examine scsi sense information and log messages for | |
404 | * certain conditions, also issue uevents for some of them. | |
405 | * @sdev: Device reporting the sense code | |
406 | * @sshdr: sshdr to be examined | |
407 | */ | |
408 | static void scsi_report_sense(struct scsi_device *sdev, | |
409 | struct scsi_sense_hdr *sshdr) | |
410 | { | |
411 | enum scsi_device_event evt_type = SDEV_EVT_MAXBITS; /* i.e. none */ | |
412 | ||
413 | if (sshdr->sense_key == UNIT_ATTENTION) { | |
414 | if (sshdr->asc == 0x3f && sshdr->ascq == 0x03) { | |
415 | evt_type = SDEV_EVT_INQUIRY_CHANGE_REPORTED; | |
416 | sdev_printk(KERN_WARNING, sdev, | |
417 | "Inquiry data has changed"); | |
418 | } else if (sshdr->asc == 0x3f && sshdr->ascq == 0x0e) { | |
419 | evt_type = SDEV_EVT_LUN_CHANGE_REPORTED; | |
420 | scsi_report_lun_change(sdev); | |
421 | sdev_printk(KERN_WARNING, sdev, | |
422 | "Warning! Received an indication that the " | |
423 | "LUN assignments on this target have " | |
424 | "changed. The Linux SCSI layer does not " | |
425 | "automatically remap LUN assignments.\n"); | |
426 | } else if (sshdr->asc == 0x3f) | |
427 | sdev_printk(KERN_WARNING, sdev, | |
428 | "Warning! Received an indication that the " | |
429 | "operating parameters on this target have " | |
430 | "changed. The Linux SCSI layer does not " | |
431 | "automatically adjust these parameters.\n"); | |
432 | ||
433 | if (sshdr->asc == 0x38 && sshdr->ascq == 0x07) { | |
434 | evt_type = SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED; | |
435 | sdev_printk(KERN_WARNING, sdev, | |
436 | "Warning! Received an indication that the " | |
437 | "LUN reached a thin provisioning soft " | |
438 | "threshold.\n"); | |
439 | } | |
440 | ||
cf3431bb HR |
441 | if (sshdr->asc == 0x29) { |
442 | evt_type = SDEV_EVT_POWER_ON_RESET_OCCURRED; | |
443 | sdev_printk(KERN_WARNING, sdev, | |
444 | "Power-on or device reset occurred\n"); | |
445 | } | |
446 | ||
279afdfe EM |
447 | if (sshdr->asc == 0x2a && sshdr->ascq == 0x01) { |
448 | evt_type = SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED; | |
449 | sdev_printk(KERN_WARNING, sdev, | |
450 | "Mode parameters changed"); | |
14c3e677 HR |
451 | } else if (sshdr->asc == 0x2a && sshdr->ascq == 0x06) { |
452 | evt_type = SDEV_EVT_ALUA_STATE_CHANGE_REPORTED; | |
453 | sdev_printk(KERN_WARNING, sdev, | |
454 | "Asymmetric access state changed"); | |
279afdfe EM |
455 | } else if (sshdr->asc == 0x2a && sshdr->ascq == 0x09) { |
456 | evt_type = SDEV_EVT_CAPACITY_CHANGE_REPORTED; | |
457 | sdev_printk(KERN_WARNING, sdev, | |
458 | "Capacity data has changed"); | |
459 | } else if (sshdr->asc == 0x2a) | |
460 | sdev_printk(KERN_WARNING, sdev, | |
461 | "Parameters changed"); | |
462 | } | |
463 | ||
464 | if (evt_type != SDEV_EVT_MAXBITS) { | |
465 | set_bit(evt_type, sdev->pending_events); | |
466 | schedule_work(&sdev->event_work); | |
467 | } | |
468 | } | |
469 | ||
1da177e4 LT |
470 | /** |
471 | * scsi_check_sense - Examine scsi cmd sense | |
472 | * @scmd: Cmd to have sense checked. | |
473 | * | |
474 | * Return value: | |
87f14e65 | 475 | * SUCCESS or FAILED or NEEDS_RETRY or ADD_TO_MLQUEUE |
1da177e4 LT |
476 | * |
477 | * Notes: | |
478 | * When a deferred error is detected the current command has | |
479 | * not been executed and needs retrying. | |
dc8875e1 | 480 | */ |
3852e373 | 481 | int scsi_check_sense(struct scsi_cmnd *scmd) |
1da177e4 | 482 | { |
a6a8d9f8 | 483 | struct scsi_device *sdev = scmd->device; |
1da177e4 LT |
484 | struct scsi_sense_hdr sshdr; |
485 | ||
486 | if (! scsi_command_normalize_sense(scmd, &sshdr)) | |
487 | return FAILED; /* no valid sense data */ | |
488 | ||
279afdfe EM |
489 | scsi_report_sense(sdev, &sshdr); |
490 | ||
1da177e4 LT |
491 | if (scsi_sense_is_deferred(&sshdr)) |
492 | return NEEDS_RETRY; | |
493 | ||
ee14c674 | 494 | if (sdev->handler && sdev->handler->check_sense) { |
a6a8d9f8 CS |
495 | int rc; |
496 | ||
ee14c674 | 497 | rc = sdev->handler->check_sense(sdev, &sshdr); |
a6a8d9f8 CS |
498 | if (rc != SCSI_RETURN_NOT_HANDLED) |
499 | return rc; | |
500 | /* handler does not care. Drop down to default handling */ | |
501 | } | |
502 | ||
e925cc43 CH |
503 | if (scmd->cmnd[0] == TEST_UNIT_READY && scmd->scsi_done != scsi_eh_done) |
504 | /* | |
505 | * nasty: for mid-layer issued TURs, we need to return the | |
506 | * actual sense data without any recovery attempt. For eh | |
507 | * issued ones, we need to try to recover and interpret | |
508 | */ | |
509 | return SUCCESS; | |
510 | ||
1da177e4 LT |
511 | /* |
512 | * Previous logic looked for FILEMARK, EOM or ILI which are | |
513 | * mainly associated with tapes and returned SUCCESS. | |
514 | */ | |
515 | if (sshdr.response_code == 0x70) { | |
516 | /* fixed format */ | |
517 | if (scmd->sense_buffer[2] & 0xe0) | |
518 | return SUCCESS; | |
519 | } else { | |
520 | /* | |
521 | * descriptor format: look for "stream commands sense data | |
522 | * descriptor" (see SSC-3). Assume single sense data | |
523 | * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG. | |
524 | */ | |
525 | if ((sshdr.additional_length > 3) && | |
526 | (scmd->sense_buffer[8] == 0x4) && | |
527 | (scmd->sense_buffer[11] & 0xe0)) | |
528 | return SUCCESS; | |
529 | } | |
530 | ||
531 | switch (sshdr.sense_key) { | |
532 | case NO_SENSE: | |
533 | return SUCCESS; | |
534 | case RECOVERED_ERROR: | |
535 | return /* soft_error */ SUCCESS; | |
536 | ||
537 | case ABORTED_COMMAND: | |
511e44f4 MP |
538 | if (sshdr.asc == 0x10) /* DIF */ |
539 | return SUCCESS; | |
540 | ||
29cfc2ab MW |
541 | if (sshdr.asc == 0x44 && sdev->sdev_bflags & BLIST_RETRY_ITF) |
542 | return ADD_TO_MLQUEUE; | |
c3606520 MW |
543 | if (sshdr.asc == 0xc1 && sshdr.ascq == 0x01 && |
544 | sdev->sdev_bflags & BLIST_RETRY_ASC_C1) | |
545 | return ADD_TO_MLQUEUE; | |
29cfc2ab | 546 | |
1da177e4 LT |
547 | return NEEDS_RETRY; |
548 | case NOT_READY: | |
549 | case UNIT_ATTENTION: | |
550 | /* | |
551 | * if we are expecting a cc/ua because of a bus reset that we | |
552 | * performed, treat this just as a retry. otherwise this is | |
553 | * information that we should pass up to the upper-level driver | |
554 | * so that we can deal with it there. | |
555 | */ | |
556 | if (scmd->device->expecting_cc_ua) { | |
dfcf7775 TH |
557 | /* |
558 | * Because some device does not queue unit | |
559 | * attentions correctly, we carefully check | |
560 | * additional sense code and qualifier so as | |
561 | * not to squash media change unit attention. | |
562 | */ | |
563 | if (sshdr.asc != 0x28 || sshdr.ascq != 0x00) { | |
564 | scmd->device->expecting_cc_ua = 0; | |
565 | return NEEDS_RETRY; | |
566 | } | |
1da177e4 | 567 | } |
279afdfe EM |
568 | /* |
569 | * we might also expect a cc/ua if another LUN on the target | |
570 | * reported a UA with an ASC/ASCQ of 3F 0E - | |
571 | * REPORTED LUNS DATA HAS CHANGED. | |
572 | */ | |
573 | if (scmd->device->sdev_target->expecting_lun_change && | |
574 | sshdr.asc == 0x3f && sshdr.ascq == 0x0e) | |
575 | return NEEDS_RETRY; | |
1da177e4 | 576 | /* |
0bf8c869 | 577 | * if the device is in the process of becoming ready, we |
1da177e4 LT |
578 | * should retry. |
579 | */ | |
580 | if ((sshdr.asc == 0x04) && (sshdr.ascq == 0x01)) | |
581 | return NEEDS_RETRY; | |
582 | /* | |
583 | * if the device is not started, we need to wake | |
584 | * the error handler to start the motor | |
585 | */ | |
586 | if (scmd->device->allow_restart && | |
587 | (sshdr.asc == 0x04) && (sshdr.ascq == 0x02)) | |
588 | return FAILED; | |
02e031cb CH |
589 | /* |
590 | * Pass the UA upwards for a determination in the completion | |
591 | * functions. | |
592 | */ | |
593 | return SUCCESS; | |
1da177e4 | 594 | |
63583cca | 595 | /* these are not supported */ |
a9d6ceb8 HR |
596 | case DATA_PROTECT: |
597 | if (sshdr.asc == 0x27 && sshdr.ascq == 0x07) { | |
598 | /* Thin provisioning hard threshold reached */ | |
599 | set_host_byte(scmd, DID_ALLOC_FAILURE); | |
600 | return SUCCESS; | |
601 | } | |
3bf2ff67 | 602 | /* FALLTHROUGH */ |
1da177e4 LT |
603 | case COPY_ABORTED: |
604 | case VOLUME_OVERFLOW: | |
605 | case MISCOMPARE: | |
63583cca | 606 | case BLANK_CHECK: |
87f14e65 HR |
607 | set_host_byte(scmd, DID_TARGET_FAILURE); |
608 | return SUCCESS; | |
1da177e4 LT |
609 | |
610 | case MEDIUM_ERROR: | |
fd1b494d LT |
611 | if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */ |
612 | sshdr.asc == 0x13 || /* AMNF DATA FIELD */ | |
613 | sshdr.asc == 0x14) { /* RECORD NOT FOUND */ | |
7e782af5 | 614 | set_host_byte(scmd, DID_MEDIUM_ERROR); |
87f14e65 | 615 | return SUCCESS; |
fd1b494d | 616 | } |
1da177e4 LT |
617 | return NEEDS_RETRY; |
618 | ||
619 | case HARDWARE_ERROR: | |
620 | if (scmd->device->retry_hwerror) | |
bb0003c1 | 621 | return ADD_TO_MLQUEUE; |
1da177e4 | 622 | else |
87f14e65 | 623 | set_host_byte(scmd, DID_TARGET_FAILURE); |
3bf2ff67 | 624 | /* FALLTHROUGH */ |
1da177e4 LT |
625 | |
626 | case ILLEGAL_REQUEST: | |
47ac56db MS |
627 | if (sshdr.asc == 0x20 || /* Invalid command operation code */ |
628 | sshdr.asc == 0x21 || /* Logical block address out of range */ | |
a8bbb2ab | 629 | sshdr.asc == 0x22 || /* Invalid function */ |
47ac56db | 630 | sshdr.asc == 0x24 || /* Invalid field in cdb */ |
d0b7a909 MW |
631 | sshdr.asc == 0x26 || /* Parameter value invalid */ |
632 | sshdr.asc == 0x27) { /* Write protected */ | |
87f14e65 | 633 | set_host_byte(scmd, DID_TARGET_FAILURE); |
47ac56db MS |
634 | } |
635 | return SUCCESS; | |
636 | ||
1da177e4 LT |
637 | default: |
638 | return SUCCESS; | |
639 | } | |
640 | } | |
3852e373 | 641 | EXPORT_SYMBOL_GPL(scsi_check_sense); |
1da177e4 | 642 | |
4a84067d VD |
643 | static void scsi_handle_queue_ramp_up(struct scsi_device *sdev) |
644 | { | |
645 | struct scsi_host_template *sht = sdev->host->hostt; | |
646 | struct scsi_device *tmp_sdev; | |
647 | ||
c40ecc12 | 648 | if (!sht->track_queue_depth || |
4a84067d VD |
649 | sdev->queue_depth >= sdev->max_queue_depth) |
650 | return; | |
651 | ||
652 | if (time_before(jiffies, | |
653 | sdev->last_queue_ramp_up + sdev->queue_ramp_up_period)) | |
654 | return; | |
655 | ||
656 | if (time_before(jiffies, | |
657 | sdev->last_queue_full_time + sdev->queue_ramp_up_period)) | |
658 | return; | |
659 | ||
660 | /* | |
661 | * Walk all devices of a target and do | |
662 | * ramp up on them. | |
663 | */ | |
664 | shost_for_each_device(tmp_sdev, sdev->host) { | |
665 | if (tmp_sdev->channel != sdev->channel || | |
666 | tmp_sdev->id != sdev->id || | |
667 | tmp_sdev->queue_depth == sdev->max_queue_depth) | |
668 | continue; | |
c40ecc12 | 669 | |
db5ed4df | 670 | scsi_change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1); |
4a84067d VD |
671 | sdev->last_queue_ramp_up = jiffies; |
672 | } | |
673 | } | |
674 | ||
42a6a918 MC |
675 | static void scsi_handle_queue_full(struct scsi_device *sdev) |
676 | { | |
677 | struct scsi_host_template *sht = sdev->host->hostt; | |
678 | struct scsi_device *tmp_sdev; | |
679 | ||
c40ecc12 | 680 | if (!sht->track_queue_depth) |
42a6a918 MC |
681 | return; |
682 | ||
683 | shost_for_each_device(tmp_sdev, sdev->host) { | |
684 | if (tmp_sdev->channel != sdev->channel || | |
685 | tmp_sdev->id != sdev->id) | |
686 | continue; | |
687 | /* | |
688 | * We do not know the number of commands that were at | |
689 | * the device when we got the queue full so we start | |
690 | * from the highest possible value and work our way down. | |
691 | */ | |
c40ecc12 | 692 | scsi_track_queue_full(tmp_sdev, tmp_sdev->queue_depth - 1); |
42a6a918 MC |
693 | } |
694 | } | |
695 | ||
1da177e4 LT |
696 | /** |
697 | * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD. | |
698 | * @scmd: SCSI cmd to examine. | |
699 | * | |
700 | * Notes: | |
701 | * This is *only* called when we are examining the status of commands | |
702 | * queued during error recovery. the main difference here is that we | |
703 | * don't allow for the possibility of retries here, and we are a lot | |
704 | * more restrictive about what we consider acceptable. | |
dc8875e1 | 705 | */ |
1da177e4 LT |
706 | static int scsi_eh_completed_normally(struct scsi_cmnd *scmd) |
707 | { | |
708 | /* | |
709 | * first check the host byte, to see if there is anything in there | |
710 | * that would indicate what we need to do. | |
711 | */ | |
712 | if (host_byte(scmd->result) == DID_RESET) { | |
713 | /* | |
714 | * rats. we are already in the error handler, so we now | |
715 | * get to try and figure out what to do next. if the sense | |
716 | * is valid, we have a pretty good idea of what to do. | |
717 | * if not, we mark it as FAILED. | |
718 | */ | |
719 | return scsi_check_sense(scmd); | |
720 | } | |
721 | if (host_byte(scmd->result) != DID_OK) | |
722 | return FAILED; | |
723 | ||
724 | /* | |
725 | * next, check the message byte. | |
726 | */ | |
727 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
728 | return FAILED; | |
729 | ||
730 | /* | |
731 | * now, check the status byte to see if this indicates | |
732 | * anything special. | |
733 | */ | |
734 | switch (status_byte(scmd->result)) { | |
735 | case GOOD: | |
4a84067d | 736 | scsi_handle_queue_ramp_up(scmd->device); |
3bf2ff67 | 737 | /* FALLTHROUGH */ |
1da177e4 LT |
738 | case COMMAND_TERMINATED: |
739 | return SUCCESS; | |
740 | case CHECK_CONDITION: | |
741 | return scsi_check_sense(scmd); | |
742 | case CONDITION_GOOD: | |
743 | case INTERMEDIATE_GOOD: | |
744 | case INTERMEDIATE_C_GOOD: | |
745 | /* | |
746 | * who knows? FIXME(eric) | |
747 | */ | |
748 | return SUCCESS; | |
5f91bb05 | 749 | case RESERVATION_CONFLICT: |
67110dfd JB |
750 | if (scmd->cmnd[0] == TEST_UNIT_READY) |
751 | /* it is a success, we probed the device and | |
752 | * found it */ | |
753 | return SUCCESS; | |
754 | /* otherwise, we failed to send the command */ | |
755 | return FAILED; | |
1da177e4 | 756 | case QUEUE_FULL: |
42a6a918 MC |
757 | scsi_handle_queue_full(scmd->device); |
758 | /* fall through */ | |
759 | case BUSY: | |
3eb3a928 | 760 | return NEEDS_RETRY; |
1da177e4 LT |
761 | default: |
762 | return FAILED; | |
763 | } | |
764 | return FAILED; | |
765 | } | |
766 | ||
1da177e4 LT |
767 | /** |
768 | * scsi_eh_done - Completion function for error handling. | |
769 | * @scmd: Cmd that is done. | |
dc8875e1 | 770 | */ |
1da177e4 LT |
771 | static void scsi_eh_done(struct scsi_cmnd *scmd) |
772 | { | |
0bf8c869 | 773 | struct completion *eh_action; |
85631672 | 774 | |
91921e01 | 775 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
470613b4 | 776 | "%s result: %x\n", __func__, scmd->result)); |
85631672 MR |
777 | |
778 | eh_action = scmd->device->host->eh_action; | |
779 | if (eh_action) | |
780 | complete(eh_action); | |
1da177e4 LT |
781 | } |
782 | ||
292148f8 BK |
783 | /** |
784 | * scsi_try_host_reset - ask host adapter to reset itself | |
c2b3ebd0 | 785 | * @scmd: SCSI cmd to send host reset. |
dc8875e1 | 786 | */ |
292148f8 BK |
787 | static int scsi_try_host_reset(struct scsi_cmnd *scmd) |
788 | { | |
789 | unsigned long flags; | |
790 | int rtn; | |
0bf8c869 JJ |
791 | struct Scsi_Host *host = scmd->device->host; |
792 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 | 793 | |
91921e01 HR |
794 | SCSI_LOG_ERROR_RECOVERY(3, |
795 | shost_printk(KERN_INFO, host, "Snd Host RST\n")); | |
292148f8 | 796 | |
0bf8c869 | 797 | if (!hostt->eh_host_reset_handler) |
292148f8 BK |
798 | return FAILED; |
799 | ||
0bf8c869 | 800 | rtn = hostt->eh_host_reset_handler(scmd); |
292148f8 BK |
801 | |
802 | if (rtn == SUCCESS) { | |
0bf8c869 | 803 | if (!hostt->skip_settle_delay) |
292148f8 | 804 | ssleep(HOST_RESET_SETTLE_TIME); |
0bf8c869 JJ |
805 | spin_lock_irqsave(host->host_lock, flags); |
806 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
807 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
808 | } |
809 | ||
810 | return rtn; | |
811 | } | |
812 | ||
813 | /** | |
814 | * scsi_try_bus_reset - ask host to perform a bus reset | |
815 | * @scmd: SCSI cmd to send bus reset. | |
dc8875e1 | 816 | */ |
292148f8 BK |
817 | static int scsi_try_bus_reset(struct scsi_cmnd *scmd) |
818 | { | |
819 | unsigned long flags; | |
820 | int rtn; | |
0bf8c869 JJ |
821 | struct Scsi_Host *host = scmd->device->host; |
822 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 | 823 | |
91921e01 HR |
824 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
825 | "%s: Snd Bus RST\n", __func__)); | |
292148f8 | 826 | |
0bf8c869 | 827 | if (!hostt->eh_bus_reset_handler) |
292148f8 BK |
828 | return FAILED; |
829 | ||
0bf8c869 | 830 | rtn = hostt->eh_bus_reset_handler(scmd); |
292148f8 BK |
831 | |
832 | if (rtn == SUCCESS) { | |
0bf8c869 | 833 | if (!hostt->skip_settle_delay) |
292148f8 | 834 | ssleep(BUS_RESET_SETTLE_TIME); |
0bf8c869 JJ |
835 | spin_lock_irqsave(host->host_lock, flags); |
836 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
837 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
838 | } |
839 | ||
840 | return rtn; | |
841 | } | |
842 | ||
30bd7df8 MC |
843 | static void __scsi_report_device_reset(struct scsi_device *sdev, void *data) |
844 | { | |
845 | sdev->was_reset = 1; | |
846 | sdev->expecting_cc_ua = 1; | |
847 | } | |
848 | ||
849 | /** | |
850 | * scsi_try_target_reset - Ask host to perform a target reset | |
851 | * @scmd: SCSI cmd used to send a target reset | |
852 | * | |
853 | * Notes: | |
854 | * There is no timeout for this operation. if this operation is | |
855 | * unreliable for a given host, then the host itself needs to put a | |
856 | * timer on it, and set the host back to a consistent state prior to | |
857 | * returning. | |
858 | */ | |
859 | static int scsi_try_target_reset(struct scsi_cmnd *scmd) | |
860 | { | |
861 | unsigned long flags; | |
862 | int rtn; | |
0bf8c869 JJ |
863 | struct Scsi_Host *host = scmd->device->host; |
864 | struct scsi_host_template *hostt = host->hostt; | |
30bd7df8 | 865 | |
0bf8c869 | 866 | if (!hostt->eh_target_reset_handler) |
30bd7df8 MC |
867 | return FAILED; |
868 | ||
0bf8c869 | 869 | rtn = hostt->eh_target_reset_handler(scmd); |
30bd7df8 | 870 | if (rtn == SUCCESS) { |
0bf8c869 | 871 | spin_lock_irqsave(host->host_lock, flags); |
30bd7df8 MC |
872 | __starget_for_each_device(scsi_target(scmd->device), NULL, |
873 | __scsi_report_device_reset); | |
0bf8c869 | 874 | spin_unlock_irqrestore(host->host_lock, flags); |
30bd7df8 MC |
875 | } |
876 | ||
877 | return rtn; | |
878 | } | |
879 | ||
292148f8 BK |
880 | /** |
881 | * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev | |
882 | * @scmd: SCSI cmd used to send BDR | |
883 | * | |
884 | * Notes: | |
885 | * There is no timeout for this operation. if this operation is | |
886 | * unreliable for a given host, then the host itself needs to put a | |
887 | * timer on it, and set the host back to a consistent state prior to | |
888 | * returning. | |
dc8875e1 | 889 | */ |
292148f8 BK |
890 | static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd) |
891 | { | |
892 | int rtn; | |
0bf8c869 | 893 | struct scsi_host_template *hostt = scmd->device->host->hostt; |
292148f8 | 894 | |
0bf8c869 | 895 | if (!hostt->eh_device_reset_handler) |
292148f8 BK |
896 | return FAILED; |
897 | ||
0bf8c869 | 898 | rtn = hostt->eh_device_reset_handler(scmd); |
30bd7df8 MC |
899 | if (rtn == SUCCESS) |
900 | __scsi_report_device_reset(scmd->device, NULL); | |
292148f8 BK |
901 | return rtn; |
902 | } | |
903 | ||
883a030f HR |
904 | /** |
905 | * scsi_try_to_abort_cmd - Ask host to abort a SCSI command | |
6583f6fb | 906 | * @hostt: SCSI driver host template |
883a030f HR |
907 | * @scmd: SCSI cmd used to send a target reset |
908 | * | |
909 | * Return value: | |
910 | * SUCCESS, FAILED, or FAST_IO_FAIL | |
911 | * | |
912 | * Notes: | |
913 | * SUCCESS does not necessarily indicate that the command | |
914 | * has been aborted; it only indicates that the LLDDs | |
915 | * has cleared all references to that command. | |
916 | * LLDDs should return FAILED only if an abort was required | |
917 | * but could not be executed. LLDDs should return FAST_IO_FAIL | |
918 | * if the device is temporarily unavailable (eg due to a | |
919 | * link down on FibreChannel) | |
920 | */ | |
921 | static int scsi_try_to_abort_cmd(struct scsi_host_template *hostt, | |
922 | struct scsi_cmnd *scmd) | |
292148f8 | 923 | { |
0bf8c869 | 924 | if (!hostt->eh_abort_handler) |
292148f8 BK |
925 | return FAILED; |
926 | ||
0bf8c869 | 927 | return hostt->eh_abort_handler(scmd); |
292148f8 BK |
928 | } |
929 | ||
292148f8 BK |
930 | static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd) |
931 | { | |
0bf8c869 | 932 | if (scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd) != SUCCESS) |
292148f8 | 933 | if (scsi_try_bus_device_reset(scmd) != SUCCESS) |
30bd7df8 MC |
934 | if (scsi_try_target_reset(scmd) != SUCCESS) |
935 | if (scsi_try_bus_reset(scmd) != SUCCESS) | |
936 | scsi_try_host_reset(scmd); | |
292148f8 BK |
937 | } |
938 | ||
1da177e4 | 939 | /** |
3b729f76 | 940 | * scsi_eh_prep_cmnd - Save a scsi command info as part of error recovery |
2dc611de | 941 | * @scmd: SCSI command structure to hijack |
e1c23468 | 942 | * @ses: structure to save restore information |
55db6c1b | 943 | * @cmnd: CDB to send. Can be NULL if no new cmnd is needed |
64a87b24 | 944 | * @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB) |
55db6c1b | 945 | * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored) |
2dc611de | 946 | * |
e1c23468 | 947 | * This function is used to save a scsi command information before re-execution |
55db6c1b BH |
948 | * as part of the error recovery process. If @sense_bytes is 0 the command |
949 | * sent must be one that does not transfer any data. If @sense_bytes != 0 | |
950 | * @cmnd is ignored and this functions sets up a REQUEST_SENSE command | |
951 | * and cmnd buffers to read @sense_bytes into @scmd->sense_buffer. | |
dc8875e1 | 952 | */ |
e1c23468 BH |
953 | void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, |
954 | unsigned char *cmnd, int cmnd_size, unsigned sense_bytes) | |
1da177e4 | 955 | { |
f59114b7 | 956 | struct scsi_device *sdev = scmd->device; |
1da177e4 | 957 | |
631c228c CH |
958 | /* |
959 | * We need saved copies of a number of fields - this is because | |
960 | * error handling may need to overwrite these with different values | |
961 | * to run different commands, and once error handling is complete, | |
962 | * we will need to restore these values prior to running the actual | |
963 | * command. | |
964 | */ | |
e1c23468 | 965 | ses->cmd_len = scmd->cmd_len; |
64a87b24 | 966 | ses->cmnd = scmd->cmnd; |
e1c23468 | 967 | ses->data_direction = scmd->sc_data_direction; |
30b0c37b | 968 | ses->sdb = scmd->sdb; |
e1c23468 | 969 | ses->result = scmd->result; |
8f8fed0c | 970 | ses->resid_len = scmd->req.resid_len; |
12265709 | 971 | ses->underflow = scmd->underflow; |
db007fc5 | 972 | ses->prot_op = scmd->prot_op; |
8e8c9d01 | 973 | ses->eh_eflags = scmd->eh_eflags; |
631c228c | 974 | |
db007fc5 | 975 | scmd->prot_op = SCSI_PROT_NORMAL; |
c69e6f81 | 976 | scmd->eh_eflags = 0; |
64a87b24 BH |
977 | scmd->cmnd = ses->eh_cmnd; |
978 | memset(scmd->cmnd, 0, BLK_MAX_CDB); | |
30b0c37b | 979 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
644373a4 | 980 | scmd->result = 0; |
8f8fed0c | 981 | scmd->req.resid_len = 0; |
30b0c37b | 982 | |
55db6c1b | 983 | if (sense_bytes) { |
30b0c37b BH |
984 | scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE, |
985 | sense_bytes); | |
e1c23468 | 986 | sg_init_one(&ses->sense_sgl, scmd->sense_buffer, |
30b0c37b BH |
987 | scmd->sdb.length); |
988 | scmd->sdb.table.sgl = &ses->sense_sgl; | |
55db6c1b | 989 | scmd->sc_data_direction = DMA_FROM_DEVICE; |
0c958ecc | 990 | scmd->sdb.table.nents = scmd->sdb.table.orig_nents = 1; |
55db6c1b | 991 | scmd->cmnd[0] = REQUEST_SENSE; |
30b0c37b | 992 | scmd->cmnd[4] = scmd->sdb.length; |
55db6c1b | 993 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); |
631c228c | 994 | } else { |
631c228c | 995 | scmd->sc_data_direction = DMA_NONE; |
55db6c1b | 996 | if (cmnd) { |
64a87b24 | 997 | BUG_ON(cmnd_size > BLK_MAX_CDB); |
55db6c1b BH |
998 | memcpy(scmd->cmnd, cmnd, cmnd_size); |
999 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); | |
1000 | } | |
631c228c CH |
1001 | } |
1002 | ||
1003 | scmd->underflow = 0; | |
631c228c | 1004 | |
55db6c1b | 1005 | if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN) |
1da177e4 | 1006 | scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) | |
f59114b7 | 1007 | (sdev->lun << 5 & 0xe0); |
1da177e4 | 1008 | |
631c228c CH |
1009 | /* |
1010 | * Zero the sense buffer. The scsi spec mandates that any | |
1011 | * untransferred sense data should be interpreted as being zero. | |
1012 | */ | |
b80ca4f7 | 1013 | memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); |
e1c23468 BH |
1014 | } |
1015 | EXPORT_SYMBOL(scsi_eh_prep_cmnd); | |
1016 | ||
1017 | /** | |
3b729f76 | 1018 | * scsi_eh_restore_cmnd - Restore a scsi command info as part of error recovery |
e1c23468 | 1019 | * @scmd: SCSI command structure to restore |
477e608c | 1020 | * @ses: saved information from a coresponding call to scsi_eh_prep_cmnd |
e1c23468 | 1021 | * |
477e608c | 1022 | * Undo any damage done by above scsi_eh_prep_cmnd(). |
dc8875e1 | 1023 | */ |
e1c23468 BH |
1024 | void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses) |
1025 | { | |
1026 | /* | |
1027 | * Restore original data | |
1028 | */ | |
1029 | scmd->cmd_len = ses->cmd_len; | |
64a87b24 | 1030 | scmd->cmnd = ses->cmnd; |
e1c23468 | 1031 | scmd->sc_data_direction = ses->data_direction; |
30b0c37b | 1032 | scmd->sdb = ses->sdb; |
e1c23468 | 1033 | scmd->result = ses->result; |
8f8fed0c | 1034 | scmd->req.resid_len = ses->resid_len; |
12265709 | 1035 | scmd->underflow = ses->underflow; |
db007fc5 | 1036 | scmd->prot_op = ses->prot_op; |
8e8c9d01 | 1037 | scmd->eh_eflags = ses->eh_eflags; |
e1c23468 BH |
1038 | } |
1039 | EXPORT_SYMBOL(scsi_eh_restore_cmnd); | |
631c228c | 1040 | |
e1c23468 | 1041 | /** |
3b729f76 | 1042 | * scsi_send_eh_cmnd - submit a scsi command as part of error recovery |
e1c23468 BH |
1043 | * @scmd: SCSI command structure to hijack |
1044 | * @cmnd: CDB to send | |
1045 | * @cmnd_size: size in bytes of @cmnd | |
1046 | * @timeout: timeout for this request | |
1047 | * @sense_bytes: size of sense data to copy or 0 | |
1048 | * | |
1049 | * This function is used to send a scsi command down to a target device | |
1050 | * as part of the error recovery process. See also scsi_eh_prep_cmnd() above. | |
1051 | * | |
1052 | * Return value: | |
1053 | * SUCCESS or FAILED or NEEDS_RETRY | |
dc8875e1 | 1054 | */ |
e1c23468 BH |
1055 | static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd, |
1056 | int cmnd_size, int timeout, unsigned sense_bytes) | |
1057 | { | |
1058 | struct scsi_device *sdev = scmd->device; | |
1059 | struct Scsi_Host *shost = sdev->host; | |
1060 | DECLARE_COMPLETION_ONSTACK(done); | |
bbe9fb0d | 1061 | unsigned long timeleft = timeout, delay; |
e1c23468 | 1062 | struct scsi_eh_save ses; |
fc73648a | 1063 | const unsigned long stall_for = msecs_to_jiffies(100); |
e1c23468 BH |
1064 | int rtn; |
1065 | ||
fc73648a | 1066 | retry: |
e1c23468 | 1067 | scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes); |
7dfdc9a5 | 1068 | shost->eh_action = &done; |
1da177e4 | 1069 | |
1da177e4 | 1070 | scsi_log_send(scmd); |
f281233d | 1071 | scmd->scsi_done = scsi_eh_done; |
bbe9fb0d BVA |
1072 | |
1073 | /* | |
1074 | * Lock sdev->state_mutex to avoid that scsi_device_quiesce() can | |
1075 | * change the SCSI device state after we have examined it and before | |
1076 | * .queuecommand() is called. | |
1077 | */ | |
1078 | mutex_lock(&sdev->state_mutex); | |
1079 | while (sdev->sdev_state == SDEV_BLOCK && timeleft > 0) { | |
1080 | mutex_unlock(&sdev->state_mutex); | |
1081 | SCSI_LOG_ERROR_RECOVERY(5, sdev_printk(KERN_DEBUG, sdev, | |
1082 | "%s: state %d <> %d\n", __func__, sdev->sdev_state, | |
1083 | SDEV_BLOCK)); | |
1084 | delay = min(timeleft, stall_for); | |
1085 | timeleft -= delay; | |
1086 | msleep(jiffies_to_msecs(delay)); | |
1087 | mutex_lock(&sdev->state_mutex); | |
1088 | } | |
1089 | if (sdev->sdev_state != SDEV_BLOCK) | |
1090 | rtn = shost->hostt->queuecommand(shost, scmd); | |
1091 | else | |
1092 | rtn = SCSI_MLQUEUE_DEVICE_BUSY; | |
1093 | mutex_unlock(&sdev->state_mutex); | |
1094 | ||
fc73648a HR |
1095 | if (rtn) { |
1096 | if (timeleft > stall_for) { | |
1097 | scsi_eh_restore_cmnd(scmd, &ses); | |
1098 | timeleft -= stall_for; | |
1099 | msleep(jiffies_to_msecs(stall_for)); | |
1100 | goto retry; | |
1101 | } | |
1102 | /* signal not to enter either branch of the if () below */ | |
1103 | timeleft = 0; | |
511833ac | 1104 | rtn = FAILED; |
fc73648a HR |
1105 | } else { |
1106 | timeleft = wait_for_completion_timeout(&done, timeout); | |
ac61d195 | 1107 | rtn = SUCCESS; |
fc73648a | 1108 | } |
1da177e4 | 1109 | |
f59114b7 | 1110 | shost->eh_action = NULL; |
1da177e4 | 1111 | |
fc73648a | 1112 | scsi_log_completion(scmd, rtn); |
1da177e4 | 1113 | |
91921e01 | 1114 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
470613b4 HR |
1115 | "%s timeleft: %ld\n", |
1116 | __func__, timeleft)); | |
1da177e4 LT |
1117 | |
1118 | /* | |
fc73648a HR |
1119 | * If there is time left scsi_eh_done got called, and we will examine |
1120 | * the actual status codes to see whether the command actually did | |
1121 | * complete normally, else if we have a zero return and no time left, | |
1122 | * the command must still be pending, so abort it and return FAILED. | |
1123 | * If we never actually managed to issue the command, because | |
1124 | * ->queuecommand() kept returning non zero, use the rtn = FAILED | |
1125 | * value above (so don't execute either branch of the if) | |
1da177e4 | 1126 | */ |
7dfdc9a5 | 1127 | if (timeleft) { |
1da177e4 | 1128 | rtn = scsi_eh_completed_normally(scmd); |
91921e01 HR |
1129 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
1130 | "%s: scsi_eh_completed_normally %x\n", __func__, rtn)); | |
7dfdc9a5 | 1131 | |
1da177e4 LT |
1132 | switch (rtn) { |
1133 | case SUCCESS: | |
1134 | case NEEDS_RETRY: | |
1135 | case FAILED: | |
1136 | break; | |
6e883b0e HR |
1137 | case ADD_TO_MLQUEUE: |
1138 | rtn = NEEDS_RETRY; | |
1139 | break; | |
1da177e4 LT |
1140 | default: |
1141 | rtn = FAILED; | |
1142 | break; | |
1143 | } | |
511833ac | 1144 | } else if (rtn != FAILED) { |
292148f8 | 1145 | scsi_abort_eh_cmnd(scmd); |
7dfdc9a5 | 1146 | rtn = FAILED; |
1da177e4 LT |
1147 | } |
1148 | ||
e1c23468 | 1149 | scsi_eh_restore_cmnd(scmd, &ses); |
18a4d0a2 | 1150 | |
1da177e4 LT |
1151 | return rtn; |
1152 | } | |
1153 | ||
1154 | /** | |
1155 | * scsi_request_sense - Request sense data from a particular target. | |
1156 | * @scmd: SCSI cmd for request sense. | |
1157 | * | |
1158 | * Notes: | |
1159 | * Some hosts automatically obtain this information, others require | |
1160 | * that we obtain it on our own. This function will *not* return until | |
1161 | * the command either times out, or it completes. | |
dc8875e1 | 1162 | */ |
1da177e4 LT |
1163 | static int scsi_request_sense(struct scsi_cmnd *scmd) |
1164 | { | |
0816c925 | 1165 | return scsi_send_eh_cmnd(scmd, NULL, 0, scmd->device->eh_timeout, ~0); |
1da177e4 LT |
1166 | } |
1167 | ||
2451079b JB |
1168 | static int scsi_eh_action(struct scsi_cmnd *scmd, int rtn) |
1169 | { | |
57292b58 | 1170 | if (!blk_rq_is_passthrough(scmd->request)) { |
2451079b JB |
1171 | struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd); |
1172 | if (sdrv->eh_action) | |
1173 | rtn = sdrv->eh_action(scmd, rtn); | |
1174 | } | |
1175 | return rtn; | |
1176 | } | |
1177 | ||
1da177e4 LT |
1178 | /** |
1179 | * scsi_eh_finish_cmd - Handle a cmd that eh is finished with. | |
1180 | * @scmd: Original SCSI cmd that eh has finished. | |
1181 | * @done_q: Queue for processed commands. | |
1182 | * | |
1183 | * Notes: | |
1184 | * We don't want to use the normal command completion while we are are | |
1185 | * still handling errors - it may cause other commands to be queued, | |
eb44820c | 1186 | * and that would disturb what we are doing. Thus we really want to |
1da177e4 LT |
1187 | * keep a list of pending commands for final completion, and once we |
1188 | * are ready to leave error handling we handle completion for real. | |
dc8875e1 | 1189 | */ |
041c5fc3 | 1190 | void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q) |
1da177e4 | 1191 | { |
1da177e4 LT |
1192 | list_move_tail(&scmd->eh_entry, done_q); |
1193 | } | |
041c5fc3 | 1194 | EXPORT_SYMBOL(scsi_eh_finish_cmd); |
1da177e4 LT |
1195 | |
1196 | /** | |
1197 | * scsi_eh_get_sense - Get device sense data. | |
1198 | * @work_q: Queue of commands to process. | |
eb44820c | 1199 | * @done_q: Queue of processed commands. |
1da177e4 LT |
1200 | * |
1201 | * Description: | |
1202 | * See if we need to request sense information. if so, then get it | |
0bf8c869 | 1203 | * now, so we have a better idea of what to do. |
1da177e4 LT |
1204 | * |
1205 | * Notes: | |
1206 | * This has the unfortunate side effect that if a shost adapter does | |
eb44820c | 1207 | * not automatically request sense information, we end up shutting |
1da177e4 LT |
1208 | * it down before we request it. |
1209 | * | |
1210 | * All drivers should request sense information internally these days, | |
1211 | * so for now all I have to say is tough noogies if you end up in here. | |
1212 | * | |
1213 | * XXX: Long term this code should go away, but that needs an audit of | |
1214 | * all LLDDs first. | |
dc8875e1 | 1215 | */ |
dca84e46 DW |
1216 | int scsi_eh_get_sense(struct list_head *work_q, |
1217 | struct list_head *done_q) | |
1da177e4 | 1218 | { |
937abeaa | 1219 | struct scsi_cmnd *scmd, *next; |
b4562022 | 1220 | struct Scsi_Host *shost; |
1da177e4 LT |
1221 | int rtn; |
1222 | ||
709c75b5 | 1223 | /* |
1224 | * If SCSI_EH_ABORT_SCHEDULED has been set, it is timeout IO, | |
1225 | * should not get sense. | |
1226 | */ | |
937abeaa | 1227 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
a0658632 | 1228 | if ((scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) || |
1da177e4 LT |
1229 | SCSI_SENSE_VALID(scmd)) |
1230 | continue; | |
1231 | ||
b4562022 | 1232 | shost = scmd->device->host; |
b4562022 | 1233 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 | 1234 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1235 | scmd_printk(KERN_INFO, scmd, |
1236 | "%s: skip request sense, past eh deadline\n", | |
1237 | current->comm)); | |
b4562022 HR |
1238 | break; |
1239 | } | |
d555a2ab JB |
1240 | if (status_byte(scmd->result) != CHECK_CONDITION) |
1241 | /* | |
1242 | * don't request sense if there's no check condition | |
1243 | * status because the error we're processing isn't one | |
1244 | * that has a sense code (and some devices get | |
1245 | * confused by sense requests out of the blue) | |
1246 | */ | |
1247 | continue; | |
1248 | ||
3bf743e7 JG |
1249 | SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd, |
1250 | "%s: requesting sense\n", | |
1251 | current->comm)); | |
1da177e4 LT |
1252 | rtn = scsi_request_sense(scmd); |
1253 | if (rtn != SUCCESS) | |
1254 | continue; | |
1255 | ||
91921e01 | 1256 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
470613b4 | 1257 | "sense requested, result %x\n", scmd->result)); |
d811b848 | 1258 | SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense(scmd)); |
1da177e4 LT |
1259 | |
1260 | rtn = scsi_decide_disposition(scmd); | |
1261 | ||
1262 | /* | |
1263 | * if the result was normal, then just pass it along to the | |
1264 | * upper level. | |
1265 | */ | |
1266 | if (rtn == SUCCESS) | |
1267 | /* we don't want this command reissued, just | |
1268 | * finished with the sense data, so set | |
1269 | * retries to the max allowed to ensure it | |
1270 | * won't get reissued */ | |
1271 | scmd->retries = scmd->allowed; | |
1272 | else if (rtn != NEEDS_RETRY) | |
1273 | continue; | |
1274 | ||
1275 | scsi_eh_finish_cmd(scmd, done_q); | |
1276 | } | |
1277 | ||
1278 | return list_empty(work_q); | |
1279 | } | |
dca84e46 | 1280 | EXPORT_SYMBOL_GPL(scsi_eh_get_sense); |
1da177e4 | 1281 | |
1da177e4 LT |
1282 | /** |
1283 | * scsi_eh_tur - Send TUR to device. | |
eb44820c | 1284 | * @scmd: &scsi_cmnd to send TUR |
1da177e4 LT |
1285 | * |
1286 | * Return value: | |
1287 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1288 | */ |
1da177e4 LT |
1289 | static int scsi_eh_tur(struct scsi_cmnd *scmd) |
1290 | { | |
1291 | static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0}; | |
1292 | int retry_cnt = 1, rtn; | |
1293 | ||
1294 | retry_tur: | |
0816c925 MP |
1295 | rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, |
1296 | scmd->device->eh_timeout, 0); | |
1da177e4 | 1297 | |
91921e01 | 1298 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
470613b4 | 1299 | "%s return: %x\n", __func__, rtn)); |
631c228c CH |
1300 | |
1301 | switch (rtn) { | |
1302 | case NEEDS_RETRY: | |
1da177e4 LT |
1303 | if (retry_cnt--) |
1304 | goto retry_tur; | |
631c228c CH |
1305 | /*FALLTHRU*/ |
1306 | case SUCCESS: | |
e47373ec | 1307 | return 0; |
631c228c CH |
1308 | default: |
1309 | return 1; | |
e47373ec | 1310 | } |
1da177e4 LT |
1311 | } |
1312 | ||
3eef6257 DJ |
1313 | /** |
1314 | * scsi_eh_test_devices - check if devices are responding from error recovery. | |
1315 | * @cmd_list: scsi commands in error recovery. | |
74cf298f RD |
1316 | * @work_q: queue for commands which still need more error recovery |
1317 | * @done_q: queue for commands which are finished | |
1318 | * @try_stu: boolean on if a STU command should be tried in addition to TUR. | |
3eef6257 DJ |
1319 | * |
1320 | * Decription: | |
1321 | * Tests if devices are in a working state. Commands to devices now in | |
1322 | * a working state are sent to the done_q while commands to devices which | |
1323 | * are still failing to respond are returned to the work_q for more | |
1324 | * processing. | |
1325 | **/ | |
1326 | static int scsi_eh_test_devices(struct list_head *cmd_list, | |
1327 | struct list_head *work_q, | |
1328 | struct list_head *done_q, int try_stu) | |
1329 | { | |
1330 | struct scsi_cmnd *scmd, *next; | |
1331 | struct scsi_device *sdev; | |
1332 | int finish_cmds; | |
1333 | ||
1334 | while (!list_empty(cmd_list)) { | |
1335 | scmd = list_entry(cmd_list->next, struct scsi_cmnd, eh_entry); | |
1336 | sdev = scmd->device; | |
1337 | ||
b4562022 | 1338 | if (!try_stu) { |
b4562022 HR |
1339 | if (scsi_host_eh_past_deadline(sdev->host)) { |
1340 | /* Push items back onto work_q */ | |
1341 | list_splice_init(cmd_list, work_q); | |
b4562022 | 1342 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1343 | sdev_printk(KERN_INFO, sdev, |
1344 | "%s: skip test device, past eh deadline", | |
1345 | current->comm)); | |
b4562022 HR |
1346 | break; |
1347 | } | |
b4562022 HR |
1348 | } |
1349 | ||
3eef6257 DJ |
1350 | finish_cmds = !scsi_device_online(scmd->device) || |
1351 | (try_stu && !scsi_eh_try_stu(scmd) && | |
1352 | !scsi_eh_tur(scmd)) || | |
1353 | !scsi_eh_tur(scmd); | |
1354 | ||
1355 | list_for_each_entry_safe(scmd, next, cmd_list, eh_entry) | |
1356 | if (scmd->device == sdev) { | |
2451079b JB |
1357 | if (finish_cmds && |
1358 | (try_stu || | |
1359 | scsi_eh_action(scmd, SUCCESS) == SUCCESS)) | |
3eef6257 DJ |
1360 | scsi_eh_finish_cmd(scmd, done_q); |
1361 | else | |
1362 | list_move_tail(&scmd->eh_entry, work_q); | |
1363 | } | |
1364 | } | |
1365 | return list_empty(work_q); | |
1366 | } | |
1367 | ||
1da177e4 LT |
1368 | /** |
1369 | * scsi_eh_try_stu - Send START_UNIT to device. | |
eb44820c | 1370 | * @scmd: &scsi_cmnd to send START_UNIT |
1da177e4 LT |
1371 | * |
1372 | * Return value: | |
1373 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1374 | */ |
1da177e4 LT |
1375 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd) |
1376 | { | |
1377 | static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0}; | |
1da177e4 | 1378 | |
631c228c | 1379 | if (scmd->device->allow_restart) { |
ed773e66 BK |
1380 | int i, rtn = NEEDS_RETRY; |
1381 | ||
1382 | for (i = 0; rtn == NEEDS_RETRY && i < 2; i++) | |
9728c081 | 1383 | rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0); |
1da177e4 | 1384 | |
631c228c CH |
1385 | if (rtn == SUCCESS) |
1386 | return 0; | |
1387 | } | |
1da177e4 | 1388 | |
1da177e4 LT |
1389 | return 1; |
1390 | } | |
1391 | ||
1392 | /** | |
1393 | * scsi_eh_stu - send START_UNIT if needed | |
eb44820c | 1394 | * @shost: &scsi host being recovered. |
74cf298f | 1395 | * @work_q: &list_head for pending commands. |
eb44820c | 1396 | * @done_q: &list_head for processed commands. |
1da177e4 LT |
1397 | * |
1398 | * Notes: | |
1399 | * If commands are failing due to not ready, initializing command required, | |
0bf8c869 | 1400 | * try revalidating the device, which will end up sending a start unit. |
dc8875e1 | 1401 | */ |
1da177e4 LT |
1402 | static int scsi_eh_stu(struct Scsi_Host *shost, |
1403 | struct list_head *work_q, | |
1404 | struct list_head *done_q) | |
1405 | { | |
937abeaa | 1406 | struct scsi_cmnd *scmd, *stu_scmd, *next; |
1da177e4 LT |
1407 | struct scsi_device *sdev; |
1408 | ||
1409 | shost_for_each_device(sdev, shost) { | |
b4562022 | 1410 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 | 1411 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1412 | sdev_printk(KERN_INFO, sdev, |
1413 | "%s: skip START_UNIT, past eh deadline\n", | |
1414 | current->comm)); | |
b4562022 HR |
1415 | break; |
1416 | } | |
1da177e4 LT |
1417 | stu_scmd = NULL; |
1418 | list_for_each_entry(scmd, work_q, eh_entry) | |
1419 | if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) && | |
1420 | scsi_check_sense(scmd) == FAILED ) { | |
1421 | stu_scmd = scmd; | |
1422 | break; | |
1423 | } | |
1424 | ||
1425 | if (!stu_scmd) | |
1426 | continue; | |
1427 | ||
91921e01 | 1428 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1429 | sdev_printk(KERN_INFO, sdev, |
1430 | "%s: Sending START_UNIT\n", | |
1431 | current->comm)); | |
1da177e4 LT |
1432 | |
1433 | if (!scsi_eh_try_stu(stu_scmd)) { | |
1434 | if (!scsi_device_online(sdev) || | |
1435 | !scsi_eh_tur(stu_scmd)) { | |
937abeaa CH |
1436 | list_for_each_entry_safe(scmd, next, |
1437 | work_q, eh_entry) { | |
2451079b JB |
1438 | if (scmd->device == sdev && |
1439 | scsi_eh_action(scmd, SUCCESS) == SUCCESS) | |
1da177e4 LT |
1440 | scsi_eh_finish_cmd(scmd, done_q); |
1441 | } | |
1442 | } | |
1443 | } else { | |
1444 | SCSI_LOG_ERROR_RECOVERY(3, | |
a222b1e2 HR |
1445 | sdev_printk(KERN_INFO, sdev, |
1446 | "%s: START_UNIT failed\n", | |
1447 | current->comm)); | |
1da177e4 LT |
1448 | } |
1449 | } | |
1450 | ||
1451 | return list_empty(work_q); | |
1452 | } | |
1453 | ||
1454 | ||
1455 | /** | |
1456 | * scsi_eh_bus_device_reset - send bdr if needed | |
1457 | * @shost: scsi host being recovered. | |
74cf298f | 1458 | * @work_q: &list_head for pending commands. |
eb44820c | 1459 | * @done_q: &list_head for processed commands. |
1da177e4 LT |
1460 | * |
1461 | * Notes: | |
eb44820c | 1462 | * Try a bus device reset. Still, look to see whether we have multiple |
1da177e4 LT |
1463 | * devices that are jammed or not - if we have multiple devices, it |
1464 | * makes no sense to try bus_device_reset - we really would need to try | |
0bf8c869 | 1465 | * a bus_reset instead. |
dc8875e1 | 1466 | */ |
1da177e4 LT |
1467 | static int scsi_eh_bus_device_reset(struct Scsi_Host *shost, |
1468 | struct list_head *work_q, | |
1469 | struct list_head *done_q) | |
1470 | { | |
937abeaa | 1471 | struct scsi_cmnd *scmd, *bdr_scmd, *next; |
1da177e4 LT |
1472 | struct scsi_device *sdev; |
1473 | int rtn; | |
1474 | ||
1475 | shost_for_each_device(sdev, shost) { | |
b4562022 | 1476 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 | 1477 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1478 | sdev_printk(KERN_INFO, sdev, |
1479 | "%s: skip BDR, past eh deadline\n", | |
1480 | current->comm)); | |
b4562022 HR |
1481 | break; |
1482 | } | |
1da177e4 LT |
1483 | bdr_scmd = NULL; |
1484 | list_for_each_entry(scmd, work_q, eh_entry) | |
1485 | if (scmd->device == sdev) { | |
1486 | bdr_scmd = scmd; | |
1487 | break; | |
1488 | } | |
1489 | ||
1490 | if (!bdr_scmd) | |
1491 | continue; | |
1492 | ||
91921e01 | 1493 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1494 | sdev_printk(KERN_INFO, sdev, |
1495 | "%s: Sending BDR\n", current->comm)); | |
1da177e4 | 1496 | rtn = scsi_try_bus_device_reset(bdr_scmd); |
2f2eb587 | 1497 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
1da177e4 | 1498 | if (!scsi_device_online(sdev) || |
2f2eb587 | 1499 | rtn == FAST_IO_FAIL || |
1da177e4 | 1500 | !scsi_eh_tur(bdr_scmd)) { |
937abeaa CH |
1501 | list_for_each_entry_safe(scmd, next, |
1502 | work_q, eh_entry) { | |
2451079b JB |
1503 | if (scmd->device == sdev && |
1504 | scsi_eh_action(scmd, rtn) != FAILED) | |
1da177e4 LT |
1505 | scsi_eh_finish_cmd(scmd, |
1506 | done_q); | |
1507 | } | |
1508 | } | |
1509 | } else { | |
91921e01 | 1510 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1511 | sdev_printk(KERN_INFO, sdev, |
1512 | "%s: BDR failed\n", current->comm)); | |
1da177e4 LT |
1513 | } |
1514 | } | |
1515 | ||
1516 | return list_empty(work_q); | |
1517 | } | |
1518 | ||
30bd7df8 MC |
1519 | /** |
1520 | * scsi_eh_target_reset - send target reset if needed | |
1521 | * @shost: scsi host being recovered. | |
74cf298f | 1522 | * @work_q: &list_head for pending commands. |
30bd7df8 MC |
1523 | * @done_q: &list_head for processed commands. |
1524 | * | |
1525 | * Notes: | |
1526 | * Try a target reset. | |
1527 | */ | |
1528 | static int scsi_eh_target_reset(struct Scsi_Host *shost, | |
1529 | struct list_head *work_q, | |
1530 | struct list_head *done_q) | |
1531 | { | |
98db5195 | 1532 | LIST_HEAD(tmp_list); |
3eef6257 | 1533 | LIST_HEAD(check_list); |
30bd7df8 | 1534 | |
98db5195 JB |
1535 | list_splice_init(work_q, &tmp_list); |
1536 | ||
1537 | while (!list_empty(&tmp_list)) { | |
1538 | struct scsi_cmnd *next, *scmd; | |
1539 | int rtn; | |
1540 | unsigned int id; | |
b4562022 | 1541 | |
b4562022 | 1542 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 HR |
1543 | /* push back on work queue for further processing */ |
1544 | list_splice_init(&check_list, work_q); | |
1545 | list_splice_init(&tmp_list, work_q); | |
1546 | SCSI_LOG_ERROR_RECOVERY(3, | |
1547 | shost_printk(KERN_INFO, shost, | |
a222b1e2 HR |
1548 | "%s: Skip target reset, past eh deadline\n", |
1549 | current->comm)); | |
b4562022 HR |
1550 | return list_empty(work_q); |
1551 | } | |
98db5195 JB |
1552 | |
1553 | scmd = list_entry(tmp_list.next, struct scsi_cmnd, eh_entry); | |
1554 | id = scmd_id(scmd); | |
30bd7df8 | 1555 | |
91921e01 HR |
1556 | SCSI_LOG_ERROR_RECOVERY(3, |
1557 | shost_printk(KERN_INFO, shost, | |
1558 | "%s: Sending target reset to target %d\n", | |
1559 | current->comm, id)); | |
98db5195 JB |
1560 | rtn = scsi_try_target_reset(scmd); |
1561 | if (rtn != SUCCESS && rtn != FAST_IO_FAIL) | |
91921e01 HR |
1562 | SCSI_LOG_ERROR_RECOVERY(3, |
1563 | shost_printk(KERN_INFO, shost, | |
1564 | "%s: Target reset failed" | |
1565 | " target: %d\n", | |
1566 | current->comm, id)); | |
98db5195 JB |
1567 | list_for_each_entry_safe(scmd, next, &tmp_list, eh_entry) { |
1568 | if (scmd_id(scmd) != id) | |
1569 | continue; | |
1570 | ||
3eef6257 DJ |
1571 | if (rtn == SUCCESS) |
1572 | list_move_tail(&scmd->eh_entry, &check_list); | |
1573 | else if (rtn == FAST_IO_FAIL) | |
98db5195 JB |
1574 | scsi_eh_finish_cmd(scmd, done_q); |
1575 | else | |
1576 | /* push back on work queue for further processing */ | |
1577 | list_move(&scmd->eh_entry, work_q); | |
1578 | } | |
1579 | } | |
30bd7df8 | 1580 | |
3eef6257 | 1581 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
30bd7df8 MC |
1582 | } |
1583 | ||
1da177e4 | 1584 | /** |
0bf8c869 | 1585 | * scsi_eh_bus_reset - send a bus reset |
eb44820c | 1586 | * @shost: &scsi host being recovered. |
74cf298f | 1587 | * @work_q: &list_head for pending commands. |
eb44820c | 1588 | * @done_q: &list_head for processed commands. |
dc8875e1 | 1589 | */ |
1da177e4 LT |
1590 | static int scsi_eh_bus_reset(struct Scsi_Host *shost, |
1591 | struct list_head *work_q, | |
1592 | struct list_head *done_q) | |
1593 | { | |
937abeaa | 1594 | struct scsi_cmnd *scmd, *chan_scmd, *next; |
3eef6257 | 1595 | LIST_HEAD(check_list); |
1da177e4 LT |
1596 | unsigned int channel; |
1597 | int rtn; | |
1598 | ||
1599 | /* | |
1600 | * we really want to loop over the various channels, and do this on | |
1601 | * a channel by channel basis. we should also check to see if any | |
1602 | * of the failed commands are on soft_reset devices, and if so, skip | |
0bf8c869 | 1603 | * the reset. |
1da177e4 LT |
1604 | */ |
1605 | ||
1606 | for (channel = 0; channel <= shost->max_channel; channel++) { | |
b4562022 | 1607 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 HR |
1608 | list_splice_init(&check_list, work_q); |
1609 | SCSI_LOG_ERROR_RECOVERY(3, | |
1610 | shost_printk(KERN_INFO, shost, | |
a222b1e2 HR |
1611 | "%s: skip BRST, past eh deadline\n", |
1612 | current->comm)); | |
b4562022 HR |
1613 | return list_empty(work_q); |
1614 | } | |
b4562022 | 1615 | |
1da177e4 LT |
1616 | chan_scmd = NULL; |
1617 | list_for_each_entry(scmd, work_q, eh_entry) { | |
422c0d61 | 1618 | if (channel == scmd_channel(scmd)) { |
1da177e4 LT |
1619 | chan_scmd = scmd; |
1620 | break; | |
1621 | /* | |
1622 | * FIXME add back in some support for | |
1623 | * soft_reset devices. | |
1624 | */ | |
1625 | } | |
1626 | } | |
1627 | ||
1628 | if (!chan_scmd) | |
1629 | continue; | |
91921e01 HR |
1630 | SCSI_LOG_ERROR_RECOVERY(3, |
1631 | shost_printk(KERN_INFO, shost, | |
1632 | "%s: Sending BRST chan: %d\n", | |
1633 | current->comm, channel)); | |
1da177e4 | 1634 | rtn = scsi_try_bus_reset(chan_scmd); |
2f2eb587 | 1635 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
937abeaa | 1636 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3eef6257 DJ |
1637 | if (channel == scmd_channel(scmd)) { |
1638 | if (rtn == FAST_IO_FAIL) | |
1da177e4 LT |
1639 | scsi_eh_finish_cmd(scmd, |
1640 | done_q); | |
3eef6257 DJ |
1641 | else |
1642 | list_move_tail(&scmd->eh_entry, | |
1643 | &check_list); | |
1644 | } | |
1da177e4 LT |
1645 | } |
1646 | } else { | |
91921e01 HR |
1647 | SCSI_LOG_ERROR_RECOVERY(3, |
1648 | shost_printk(KERN_INFO, shost, | |
1649 | "%s: BRST failed chan: %d\n", | |
1650 | current->comm, channel)); | |
1da177e4 LT |
1651 | } |
1652 | } | |
3eef6257 | 1653 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4 LT |
1654 | } |
1655 | ||
1656 | /** | |
0bf8c869 | 1657 | * scsi_eh_host_reset - send a host reset |
74cf298f RD |
1658 | * @shost: host to be reset. |
1659 | * @work_q: &list_head for pending commands. | |
1660 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1661 | */ |
91921e01 HR |
1662 | static int scsi_eh_host_reset(struct Scsi_Host *shost, |
1663 | struct list_head *work_q, | |
1da177e4 LT |
1664 | struct list_head *done_q) |
1665 | { | |
937abeaa | 1666 | struct scsi_cmnd *scmd, *next; |
3eef6257 | 1667 | LIST_HEAD(check_list); |
1da177e4 | 1668 | int rtn; |
1da177e4 LT |
1669 | |
1670 | if (!list_empty(work_q)) { | |
1671 | scmd = list_entry(work_q->next, | |
1672 | struct scsi_cmnd, eh_entry); | |
1673 | ||
91921e01 HR |
1674 | SCSI_LOG_ERROR_RECOVERY(3, |
1675 | shost_printk(KERN_INFO, shost, | |
1676 | "%s: Sending HRST\n", | |
1677 | current->comm)); | |
1da177e4 LT |
1678 | |
1679 | rtn = scsi_try_host_reset(scmd); | |
3eef6257 DJ |
1680 | if (rtn == SUCCESS) { |
1681 | list_splice_init(work_q, &check_list); | |
1682 | } else if (rtn == FAST_IO_FAIL) { | |
937abeaa | 1683 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1da177e4 LT |
1684 | scsi_eh_finish_cmd(scmd, done_q); |
1685 | } | |
1686 | } else { | |
91921e01 HR |
1687 | SCSI_LOG_ERROR_RECOVERY(3, |
1688 | shost_printk(KERN_INFO, shost, | |
1689 | "%s: HRST failed\n", | |
1690 | current->comm)); | |
1da177e4 LT |
1691 | } |
1692 | } | |
3eef6257 | 1693 | return scsi_eh_test_devices(&check_list, work_q, done_q, 1); |
1da177e4 LT |
1694 | } |
1695 | ||
1696 | /** | |
1697 | * scsi_eh_offline_sdevs - offline scsi devices that fail to recover | |
74cf298f RD |
1698 | * @work_q: &list_head for pending commands. |
1699 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1700 | */ |
1da177e4 LT |
1701 | static void scsi_eh_offline_sdevs(struct list_head *work_q, |
1702 | struct list_head *done_q) | |
1703 | { | |
937abeaa | 1704 | struct scsi_cmnd *scmd, *next; |
0db6ca8a | 1705 | struct scsi_device *sdev; |
1da177e4 | 1706 | |
937abeaa | 1707 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
31765d7d MW |
1708 | sdev_printk(KERN_INFO, scmd->device, "Device offlined - " |
1709 | "not ready after error recovery\n"); | |
0db6ca8a BVA |
1710 | sdev = scmd->device; |
1711 | ||
1712 | mutex_lock(&sdev->state_mutex); | |
1713 | scsi_device_set_state(sdev, SDEV_OFFLINE); | |
1714 | mutex_unlock(&sdev->state_mutex); | |
1715 | ||
1da177e4 LT |
1716 | scsi_eh_finish_cmd(scmd, done_q); |
1717 | } | |
1718 | return; | |
1719 | } | |
1720 | ||
4a27446f | 1721 | /** |
e494f6a7 | 1722 | * scsi_noretry_cmd - determine if command should be failed fast |
4a27446f MC |
1723 | * @scmd: SCSI cmd to examine. |
1724 | */ | |
1725 | int scsi_noretry_cmd(struct scsi_cmnd *scmd) | |
1726 | { | |
1727 | switch (host_byte(scmd->result)) { | |
1728 | case DID_OK: | |
1729 | break; | |
e494f6a7 HR |
1730 | case DID_TIME_OUT: |
1731 | goto check_type; | |
4a27446f | 1732 | case DID_BUS_BUSY: |
33659ebb | 1733 | return (scmd->request->cmd_flags & REQ_FAILFAST_TRANSPORT); |
4a27446f | 1734 | case DID_PARITY: |
33659ebb | 1735 | return (scmd->request->cmd_flags & REQ_FAILFAST_DEV); |
4a27446f MC |
1736 | case DID_ERROR: |
1737 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1738 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1739 | return 0; | |
1740 | /* fall through */ | |
1741 | case DID_SOFT_ERROR: | |
33659ebb | 1742 | return (scmd->request->cmd_flags & REQ_FAILFAST_DRIVER); |
4a27446f MC |
1743 | } |
1744 | ||
e494f6a7 HR |
1745 | if (status_byte(scmd->result) != CHECK_CONDITION) |
1746 | return 0; | |
4a27446f | 1747 | |
e494f6a7 HR |
1748 | check_type: |
1749 | /* | |
1750 | * assume caller has checked sense and determined | |
1751 | * the check condition was retryable. | |
1752 | */ | |
1753 | if (scmd->request->cmd_flags & REQ_FAILFAST_DEV || | |
57292b58 | 1754 | blk_rq_is_passthrough(scmd->request)) |
e494f6a7 HR |
1755 | return 1; |
1756 | else | |
1757 | return 0; | |
4a27446f MC |
1758 | } |
1759 | ||
1da177e4 LT |
1760 | /** |
1761 | * scsi_decide_disposition - Disposition a cmd on return from LLD. | |
1762 | * @scmd: SCSI cmd to examine. | |
1763 | * | |
1764 | * Notes: | |
1765 | * This is *only* called when we are examining the status after sending | |
1766 | * out the actual data command. any commands that are queued for error | |
1767 | * recovery (e.g. test_unit_ready) do *not* come through here. | |
1768 | * | |
1769 | * When this routine returns failed, it means the error handler thread | |
1770 | * is woken. In cases where the error code indicates an error that | |
1771 | * doesn't require the error handler read (i.e. we don't need to | |
1772 | * abort/reset), this function should return SUCCESS. | |
dc8875e1 | 1773 | */ |
1da177e4 LT |
1774 | int scsi_decide_disposition(struct scsi_cmnd *scmd) |
1775 | { | |
1776 | int rtn; | |
1777 | ||
1778 | /* | |
1779 | * if the device is offline, then we clearly just pass the result back | |
1780 | * up to the top level. | |
1781 | */ | |
1782 | if (!scsi_device_online(scmd->device)) { | |
91921e01 HR |
1783 | SCSI_LOG_ERROR_RECOVERY(5, scmd_printk(KERN_INFO, scmd, |
1784 | "%s: device offline - report as SUCCESS\n", __func__)); | |
1da177e4 LT |
1785 | return SUCCESS; |
1786 | } | |
1787 | ||
1788 | /* | |
1789 | * first check the host byte, to see if there is anything in there | |
1790 | * that would indicate what we need to do. | |
1791 | */ | |
1792 | switch (host_byte(scmd->result)) { | |
1793 | case DID_PASSTHROUGH: | |
1794 | /* | |
1795 | * no matter what, pass this through to the upper layer. | |
1796 | * nuke this special code so that it looks like we are saying | |
1797 | * did_ok. | |
1798 | */ | |
1799 | scmd->result &= 0xff00ffff; | |
1800 | return SUCCESS; | |
1801 | case DID_OK: | |
1802 | /* | |
1803 | * looks good. drop through, and check the next byte. | |
1804 | */ | |
1805 | break; | |
e494f6a7 HR |
1806 | case DID_ABORT: |
1807 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) { | |
8922a908 | 1808 | set_host_byte(scmd, DID_TIME_OUT); |
e494f6a7 HR |
1809 | return SUCCESS; |
1810 | } | |
3bf2ff67 | 1811 | /* FALLTHROUGH */ |
1da177e4 LT |
1812 | case DID_NO_CONNECT: |
1813 | case DID_BAD_TARGET: | |
1da177e4 LT |
1814 | /* |
1815 | * note - this means that we just report the status back | |
1816 | * to the top level driver, not that we actually think | |
1817 | * that it indicates SUCCESS. | |
1818 | */ | |
1819 | return SUCCESS; | |
ad95028a | 1820 | case DID_SOFT_ERROR: |
1da177e4 LT |
1821 | /* |
1822 | * when the low level driver returns did_soft_error, | |
0bf8c869 | 1823 | * it is responsible for keeping an internal retry counter |
1da177e4 | 1824 | * in order to avoid endless loops (db) |
1da177e4 | 1825 | */ |
1da177e4 LT |
1826 | goto maybe_retry; |
1827 | case DID_IMM_RETRY: | |
1828 | return NEEDS_RETRY; | |
1829 | ||
bf341919 JB |
1830 | case DID_REQUEUE: |
1831 | return ADD_TO_MLQUEUE; | |
a4dfaa6f MC |
1832 | case DID_TRANSPORT_DISRUPTED: |
1833 | /* | |
1834 | * LLD/transport was disrupted during processing of the IO. | |
1835 | * The transport class is now blocked/blocking, | |
1836 | * and the transport will decide what to do with the IO | |
939c2288 MC |
1837 | * based on its timers and recovery capablilities if |
1838 | * there are enough retries. | |
a4dfaa6f | 1839 | */ |
939c2288 | 1840 | goto maybe_retry; |
a4dfaa6f MC |
1841 | case DID_TRANSPORT_FAILFAST: |
1842 | /* | |
1843 | * The transport decided to failfast the IO (most likely | |
1844 | * the fast io fail tmo fired), so send IO directly upwards. | |
1845 | */ | |
1846 | return SUCCESS; | |
1da177e4 LT |
1847 | case DID_ERROR: |
1848 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1849 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1850 | /* | |
1851 | * execute reservation conflict processing code | |
1852 | * lower down | |
1853 | */ | |
1854 | break; | |
1855 | /* fallthrough */ | |
1da177e4 LT |
1856 | case DID_BUS_BUSY: |
1857 | case DID_PARITY: | |
1858 | goto maybe_retry; | |
1859 | case DID_TIME_OUT: | |
1860 | /* | |
1861 | * when we scan the bus, we get timeout messages for | |
1862 | * these commands if there is no device available. | |
1863 | * other hosts report did_no_connect for the same thing. | |
1864 | */ | |
1865 | if ((scmd->cmnd[0] == TEST_UNIT_READY || | |
1866 | scmd->cmnd[0] == INQUIRY)) { | |
1867 | return SUCCESS; | |
1868 | } else { | |
1869 | return FAILED; | |
1870 | } | |
1871 | case DID_RESET: | |
1872 | return SUCCESS; | |
1873 | default: | |
1874 | return FAILED; | |
1875 | } | |
1876 | ||
1877 | /* | |
1878 | * next, check the message byte. | |
1879 | */ | |
1880 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
1881 | return FAILED; | |
1882 | ||
1883 | /* | |
1884 | * check the status byte to see if this indicates anything special. | |
1885 | */ | |
1886 | switch (status_byte(scmd->result)) { | |
1887 | case QUEUE_FULL: | |
42a6a918 | 1888 | scsi_handle_queue_full(scmd->device); |
1da177e4 LT |
1889 | /* |
1890 | * the case of trying to send too many commands to a | |
1891 | * tagged queueing device. | |
1892 | */ | |
3bf2ff67 | 1893 | /* FALLTHROUGH */ |
1da177e4 LT |
1894 | case BUSY: |
1895 | /* | |
1896 | * device can't talk to us at the moment. Should only | |
1897 | * occur (SAM-3) when the task queue is empty, so will cause | |
1898 | * the empty queue handling to trigger a stall in the | |
1899 | * device. | |
1900 | */ | |
1901 | return ADD_TO_MLQUEUE; | |
1902 | case GOOD: | |
279afdfe EM |
1903 | if (scmd->cmnd[0] == REPORT_LUNS) |
1904 | scmd->device->sdev_target->expecting_lun_change = 0; | |
4a84067d | 1905 | scsi_handle_queue_ramp_up(scmd->device); |
3bf2ff67 | 1906 | /* FALLTHROUGH */ |
1da177e4 | 1907 | case COMMAND_TERMINATED: |
1da177e4 | 1908 | return SUCCESS; |
a9b589d9 VB |
1909 | case TASK_ABORTED: |
1910 | goto maybe_retry; | |
1da177e4 LT |
1911 | case CHECK_CONDITION: |
1912 | rtn = scsi_check_sense(scmd); | |
1913 | if (rtn == NEEDS_RETRY) | |
1914 | goto maybe_retry; | |
1915 | /* if rtn == FAILED, we have no sense information; | |
1916 | * returning FAILED will wake the error handler thread | |
1917 | * to collect the sense and redo the decide | |
1918 | * disposition */ | |
1919 | return rtn; | |
1920 | case CONDITION_GOOD: | |
1921 | case INTERMEDIATE_GOOD: | |
1922 | case INTERMEDIATE_C_GOOD: | |
1923 | case ACA_ACTIVE: | |
1924 | /* | |
1925 | * who knows? FIXME(eric) | |
1926 | */ | |
1927 | return SUCCESS; | |
1928 | ||
1929 | case RESERVATION_CONFLICT: | |
9ccfc756 JB |
1930 | sdev_printk(KERN_INFO, scmd->device, |
1931 | "reservation conflict\n"); | |
2082ebc4 | 1932 | set_host_byte(scmd, DID_NEXUS_FAILURE); |
1da177e4 LT |
1933 | return SUCCESS; /* causes immediate i/o error */ |
1934 | default: | |
1935 | return FAILED; | |
1936 | } | |
1937 | return FAILED; | |
1938 | ||
8ef7fe4b | 1939 | maybe_retry: |
1da177e4 LT |
1940 | |
1941 | /* we requeue for retry because the error was retryable, and | |
1942 | * the request was not marked fast fail. Note that above, | |
1943 | * even if the request is marked fast fail, we still requeue | |
1944 | * for queue congestion conditions (QUEUE_FULL or BUSY) */ | |
8884efab | 1945 | if ((++scmd->retries) <= scmd->allowed |
4a27446f | 1946 | && !scsi_noretry_cmd(scmd)) { |
1da177e4 LT |
1947 | return NEEDS_RETRY; |
1948 | } else { | |
1949 | /* | |
1950 | * no more retries - report this one back to upper level. | |
1951 | */ | |
1952 | return SUCCESS; | |
1953 | } | |
1954 | } | |
1955 | ||
2a842aca | 1956 | static void eh_lock_door_done(struct request *req, blk_status_t status) |
f078727b | 1957 | { |
92bc5a24 | 1958 | blk_put_request(req); |
f078727b FT |
1959 | } |
1960 | ||
1da177e4 LT |
1961 | /** |
1962 | * scsi_eh_lock_door - Prevent medium removal for the specified device | |
1963 | * @sdev: SCSI device to prevent medium removal | |
1964 | * | |
1965 | * Locking: | |
91bc31fb | 1966 | * We must be called from process context. |
1da177e4 LT |
1967 | * |
1968 | * Notes: | |
1969 | * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the | |
1970 | * head of the devices request queue, and continue. | |
dc8875e1 | 1971 | */ |
1da177e4 LT |
1972 | static void scsi_eh_lock_door(struct scsi_device *sdev) |
1973 | { | |
f078727b | 1974 | struct request *req; |
82ed4db4 | 1975 | struct scsi_request *rq; |
1da177e4 | 1976 | |
ff005a06 | 1977 | req = blk_get_request(sdev->request_queue, REQ_OP_SCSI_IN, 0); |
a492f075 | 1978 | if (IS_ERR(req)) |
eb571eea | 1979 | return; |
82ed4db4 | 1980 | rq = scsi_req(req); |
1da177e4 | 1981 | |
82ed4db4 CH |
1982 | rq->cmd[0] = ALLOW_MEDIUM_REMOVAL; |
1983 | rq->cmd[1] = 0; | |
1984 | rq->cmd[2] = 0; | |
1985 | rq->cmd[3] = 0; | |
1986 | rq->cmd[4] = SCSI_REMOVAL_PREVENT; | |
1987 | rq->cmd[5] = 0; | |
1988 | rq->cmd_len = COMMAND_SIZE(rq->cmd[0]); | |
f078727b | 1989 | |
e8064021 | 1990 | req->rq_flags |= RQF_QUIET; |
f078727b | 1991 | req->timeout = 10 * HZ; |
64c7f1d1 | 1992 | rq->retries = 5; |
f078727b FT |
1993 | |
1994 | blk_execute_rq_nowait(req->q, NULL, req, 1, eh_lock_door_done); | |
1995 | } | |
1da177e4 LT |
1996 | |
1997 | /** | |
1998 | * scsi_restart_operations - restart io operations to the specified host. | |
1999 | * @shost: Host we are restarting. | |
2000 | * | |
2001 | * Notes: | |
2002 | * When we entered the error handler, we blocked all further i/o to | |
2003 | * this device. we need to 'reverse' this process. | |
dc8875e1 | 2004 | */ |
1da177e4 LT |
2005 | static void scsi_restart_operations(struct Scsi_Host *shost) |
2006 | { | |
2007 | struct scsi_device *sdev; | |
939647ee | 2008 | unsigned long flags; |
1da177e4 LT |
2009 | |
2010 | /* | |
2011 | * If the door was locked, we need to insert a door lock request | |
2012 | * onto the head of the SCSI request queue for the device. There | |
2013 | * is no point trying to lock the door of an off-line device. | |
2014 | */ | |
2015 | shost_for_each_device(sdev, shost) { | |
48379270 | 2016 | if (scsi_device_online(sdev) && sdev->was_reset && sdev->locked) { |
1da177e4 | 2017 | scsi_eh_lock_door(sdev); |
48379270 CH |
2018 | sdev->was_reset = 0; |
2019 | } | |
1da177e4 LT |
2020 | } |
2021 | ||
2022 | /* | |
2023 | * next free up anything directly waiting upon the host. this | |
2024 | * will be requests for character device operations, and also for | |
2025 | * ioctls to queued block devices. | |
2026 | */ | |
b4562022 | 2027 | SCSI_LOG_ERROR_RECOVERY(3, |
91921e01 | 2028 | shost_printk(KERN_INFO, shost, "waking up host to restart\n")); |
1da177e4 | 2029 | |
939647ee JB |
2030 | spin_lock_irqsave(shost->host_lock, flags); |
2031 | if (scsi_host_set_state(shost, SHOST_RUNNING)) | |
2032 | if (scsi_host_set_state(shost, SHOST_CANCEL)) | |
2033 | BUG_ON(scsi_host_set_state(shost, SHOST_DEL)); | |
2034 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
2035 | |
2036 | wake_up(&shost->host_wait); | |
2037 | ||
2038 | /* | |
2039 | * finally we need to re-initiate requests that may be pending. we will | |
2040 | * have had everything blocked while error handling is taking place, and | |
2041 | * now that error recovery is done, we will need to ensure that these | |
2042 | * requests are started. | |
2043 | */ | |
2044 | scsi_run_host_queues(shost); | |
57fc2e33 DW |
2045 | |
2046 | /* | |
2047 | * if eh is active and host_eh_scheduled is pending we need to re-run | |
2048 | * recovery. we do this check after scsi_run_host_queues() to allow | |
2049 | * everything pent up since the last eh run a chance to make forward | |
2050 | * progress before we sync again. Either we'll immediately re-run | |
2051 | * recovery or scsi_device_unbusy() will wake us again when these | |
2052 | * pending commands complete. | |
2053 | */ | |
2054 | spin_lock_irqsave(shost->host_lock, flags); | |
2055 | if (shost->host_eh_scheduled) | |
2056 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) | |
2057 | WARN_ON(scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)); | |
2058 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
2059 | } |
2060 | ||
2061 | /** | |
2062 | * scsi_eh_ready_devs - check device ready state and recover if not. | |
74cf298f RD |
2063 | * @shost: host to be recovered. |
2064 | * @work_q: &list_head for pending commands. | |
eb44820c | 2065 | * @done_q: &list_head for processed commands. |
dc8875e1 | 2066 | */ |
dca84e46 DW |
2067 | void scsi_eh_ready_devs(struct Scsi_Host *shost, |
2068 | struct list_head *work_q, | |
2069 | struct list_head *done_q) | |
1da177e4 LT |
2070 | { |
2071 | if (!scsi_eh_stu(shost, work_q, done_q)) | |
2072 | if (!scsi_eh_bus_device_reset(shost, work_q, done_q)) | |
30bd7df8 MC |
2073 | if (!scsi_eh_target_reset(shost, work_q, done_q)) |
2074 | if (!scsi_eh_bus_reset(shost, work_q, done_q)) | |
91921e01 | 2075 | if (!scsi_eh_host_reset(shost, work_q, done_q)) |
30bd7df8 MC |
2076 | scsi_eh_offline_sdevs(work_q, |
2077 | done_q); | |
1da177e4 | 2078 | } |
dca84e46 | 2079 | EXPORT_SYMBOL_GPL(scsi_eh_ready_devs); |
1da177e4 LT |
2080 | |
2081 | /** | |
2082 | * scsi_eh_flush_done_q - finish processed commands or retry them. | |
2083 | * @done_q: list_head of processed commands. | |
dc8875e1 | 2084 | */ |
041c5fc3 | 2085 | void scsi_eh_flush_done_q(struct list_head *done_q) |
1da177e4 | 2086 | { |
937abeaa | 2087 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 2088 | |
937abeaa CH |
2089 | list_for_each_entry_safe(scmd, next, done_q, eh_entry) { |
2090 | list_del_init(&scmd->eh_entry); | |
1da177e4 | 2091 | if (scsi_device_online(scmd->device) && |
4a27446f | 2092 | !scsi_noretry_cmd(scmd) && |
8884efab | 2093 | (++scmd->retries <= scmd->allowed)) { |
91921e01 HR |
2094 | SCSI_LOG_ERROR_RECOVERY(3, |
2095 | scmd_printk(KERN_INFO, scmd, | |
470613b4 HR |
2096 | "%s: flush retry cmd\n", |
2097 | current->comm)); | |
1da177e4 LT |
2098 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); |
2099 | } else { | |
793698ce PM |
2100 | /* |
2101 | * If just we got sense for the device (called | |
2102 | * scsi_eh_get_sense), scmd->result is already | |
2103 | * set, do not set DRIVER_TIMEOUT. | |
2104 | */ | |
1da177e4 LT |
2105 | if (!scmd->result) |
2106 | scmd->result |= (DRIVER_TIMEOUT << 24); | |
91921e01 HR |
2107 | SCSI_LOG_ERROR_RECOVERY(3, |
2108 | scmd_printk(KERN_INFO, scmd, | |
470613b4 HR |
2109 | "%s: flush finish cmd\n", |
2110 | current->comm)); | |
1da177e4 LT |
2111 | scsi_finish_command(scmd); |
2112 | } | |
2113 | } | |
2114 | } | |
041c5fc3 | 2115 | EXPORT_SYMBOL(scsi_eh_flush_done_q); |
1da177e4 LT |
2116 | |
2117 | /** | |
2118 | * scsi_unjam_host - Attempt to fix a host which has a cmd that failed. | |
2119 | * @shost: Host to unjam. | |
2120 | * | |
2121 | * Notes: | |
2122 | * When we come in here, we *know* that all commands on the bus have | |
2123 | * either completed, failed or timed out. we also know that no further | |
2124 | * commands are being sent to the host, so things are relatively quiet | |
2125 | * and we have freedom to fiddle with things as we wish. | |
2126 | * | |
2127 | * This is only the *default* implementation. it is possible for | |
2128 | * individual drivers to supply their own version of this function, and | |
2129 | * if the maintainer wishes to do this, it is strongly suggested that | |
2130 | * this function be taken as a template and modified. this function | |
2131 | * was designed to correctly handle problems for about 95% of the | |
2132 | * different cases out there, and it should always provide at least a | |
2133 | * reasonable amount of error recovery. | |
2134 | * | |
2135 | * Any command marked 'failed' or 'timeout' must eventually have | |
2136 | * scsi_finish_cmd() called for it. we do all of the retry stuff | |
2137 | * here, so when we restart the host after we return it should have an | |
2138 | * empty queue. | |
dc8875e1 | 2139 | */ |
1da177e4 LT |
2140 | static void scsi_unjam_host(struct Scsi_Host *shost) |
2141 | { | |
2142 | unsigned long flags; | |
2143 | LIST_HEAD(eh_work_q); | |
2144 | LIST_HEAD(eh_done_q); | |
2145 | ||
2146 | spin_lock_irqsave(shost->host_lock, flags); | |
2147 | list_splice_init(&shost->eh_cmd_q, &eh_work_q); | |
2148 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2149 | ||
2150 | SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost, &eh_work_q)); | |
2151 | ||
2152 | if (!scsi_eh_get_sense(&eh_work_q, &eh_done_q)) | |
a0658632 | 2153 | scsi_eh_ready_devs(shost, &eh_work_q, &eh_done_q); |
1da177e4 | 2154 | |
b4562022 | 2155 | spin_lock_irqsave(shost->host_lock, flags); |
bb3b621a | 2156 | if (shost->eh_deadline != -1) |
b4562022 HR |
2157 | shost->last_reset = 0; |
2158 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
2159 | scsi_eh_flush_done_q(&eh_done_q); |
2160 | } | |
2161 | ||
2162 | /** | |
ad42eb1b | 2163 | * scsi_error_handler - SCSI error handler thread |
1da177e4 LT |
2164 | * @data: Host for which we are running. |
2165 | * | |
2166 | * Notes: | |
ad42eb1b CH |
2167 | * This is the main error handling loop. This is run as a kernel thread |
2168 | * for every SCSI host and handles all error handling activity. | |
dc8875e1 | 2169 | */ |
1da177e4 LT |
2170 | int scsi_error_handler(void *data) |
2171 | { | |
ad42eb1b | 2172 | struct Scsi_Host *shost = data; |
1da177e4 | 2173 | |
1da177e4 | 2174 | /* |
ad42eb1b CH |
2175 | * We use TASK_INTERRUPTIBLE so that the thread is not |
2176 | * counted against the load average as a running process. | |
2177 | * We never actually get interrupted because kthread_run | |
c03264a7 | 2178 | * disables signal delivery for the created thread. |
1da177e4 | 2179 | */ |
537b604c MH |
2180 | while (true) { |
2181 | /* | |
2182 | * The sequence in kthread_stop() sets the stop flag first | |
2183 | * then wakes the process. To avoid missed wakeups, the task | |
2184 | * should always be in a non running state before the stop | |
2185 | * flag is checked | |
2186 | */ | |
b9d5c6b7 | 2187 | set_current_state(TASK_INTERRUPTIBLE); |
537b604c MH |
2188 | if (kthread_should_stop()) |
2189 | break; | |
2190 | ||
ee7863bc | 2191 | if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) || |
c84b023a | 2192 | shost->host_failed != scsi_host_busy(shost)) { |
ad42eb1b | 2193 | SCSI_LOG_ERROR_RECOVERY(1, |
91921e01 HR |
2194 | shost_printk(KERN_INFO, shost, |
2195 | "scsi_eh_%d: sleeping\n", | |
2196 | shost->host_no)); | |
3ed7a470 | 2197 | schedule(); |
3ed7a470 JB |
2198 | continue; |
2199 | } | |
1da177e4 | 2200 | |
3ed7a470 | 2201 | __set_current_state(TASK_RUNNING); |
ad42eb1b | 2202 | SCSI_LOG_ERROR_RECOVERY(1, |
91921e01 HR |
2203 | shost_printk(KERN_INFO, shost, |
2204 | "scsi_eh_%d: waking up %d/%d/%d\n", | |
2205 | shost->host_no, shost->host_eh_scheduled, | |
74665016 | 2206 | shost->host_failed, |
c84b023a | 2207 | scsi_host_busy(shost))); |
1da177e4 | 2208 | |
1da177e4 LT |
2209 | /* |
2210 | * We have a host that is failing for some reason. Figure out | |
2211 | * what we need to do to get it up and online again (if we can). | |
2212 | * If we fail, we end up taking the thing offline. | |
2213 | */ | |
ae0751ff | 2214 | if (!shost->eh_noresume && scsi_autopm_get_host(shost) != 0) { |
bc4f2401 | 2215 | SCSI_LOG_ERROR_RECOVERY(1, |
a222b1e2 HR |
2216 | shost_printk(KERN_ERR, shost, |
2217 | "scsi_eh_%d: unable to autoresume\n", | |
2218 | shost->host_no)); | |
bc4f2401 AS |
2219 | continue; |
2220 | } | |
2221 | ||
9227c33d CH |
2222 | if (shost->transportt->eh_strategy_handler) |
2223 | shost->transportt->eh_strategy_handler(shost); | |
1da177e4 LT |
2224 | else |
2225 | scsi_unjam_host(shost); | |
2226 | ||
72d8c36e WF |
2227 | /* All scmds have been handled */ |
2228 | shost->host_failed = 0; | |
2229 | ||
1da177e4 LT |
2230 | /* |
2231 | * Note - if the above fails completely, the action is to take | |
2232 | * individual devices offline and flush the queue of any | |
2233 | * outstanding requests that may have been pending. When we | |
2234 | * restart, we restart any I/O to any other devices on the bus | |
2235 | * which are still online. | |
2236 | */ | |
2237 | scsi_restart_operations(shost); | |
ae0751ff LM |
2238 | if (!shost->eh_noresume) |
2239 | scsi_autopm_put_host(shost); | |
1da177e4 | 2240 | } |
461a0ffb SR |
2241 | __set_current_state(TASK_RUNNING); |
2242 | ||
ad42eb1b | 2243 | SCSI_LOG_ERROR_RECOVERY(1, |
91921e01 HR |
2244 | shost_printk(KERN_INFO, shost, |
2245 | "Error handler scsi_eh_%d exiting\n", | |
2246 | shost->host_no)); | |
3ed7a470 | 2247 | shost->ehandler = NULL; |
1da177e4 LT |
2248 | return 0; |
2249 | } | |
2250 | ||
2251 | /* | |
2252 | * Function: scsi_report_bus_reset() | |
2253 | * | |
2254 | * Purpose: Utility function used by low-level drivers to report that | |
2255 | * they have observed a bus reset on the bus being handled. | |
2256 | * | |
2257 | * Arguments: shost - Host in question | |
2258 | * channel - channel on which reset was observed. | |
2259 | * | |
2260 | * Returns: Nothing | |
2261 | * | |
2262 | * Lock status: Host lock must be held. | |
2263 | * | |
2264 | * Notes: This only needs to be called if the reset is one which | |
2265 | * originates from an unknown location. Resets originated | |
2266 | * by the mid-level itself don't need to call this, but there | |
2267 | * should be no harm. | |
2268 | * | |
2269 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
2270 | * is properly treated. | |
2271 | */ | |
2272 | void scsi_report_bus_reset(struct Scsi_Host *shost, int channel) | |
2273 | { | |
2274 | struct scsi_device *sdev; | |
2275 | ||
2276 | __shost_for_each_device(sdev, shost) { | |
30bd7df8 MC |
2277 | if (channel == sdev_channel(sdev)) |
2278 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
2279 | } |
2280 | } | |
2281 | EXPORT_SYMBOL(scsi_report_bus_reset); | |
2282 | ||
2283 | /* | |
2284 | * Function: scsi_report_device_reset() | |
2285 | * | |
2286 | * Purpose: Utility function used by low-level drivers to report that | |
2287 | * they have observed a device reset on the device being handled. | |
2288 | * | |
2289 | * Arguments: shost - Host in question | |
2290 | * channel - channel on which reset was observed | |
2291 | * target - target on which reset was observed | |
2292 | * | |
2293 | * Returns: Nothing | |
2294 | * | |
2295 | * Lock status: Host lock must be held | |
2296 | * | |
2297 | * Notes: This only needs to be called if the reset is one which | |
2298 | * originates from an unknown location. Resets originated | |
2299 | * by the mid-level itself don't need to call this, but there | |
2300 | * should be no harm. | |
2301 | * | |
2302 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
2303 | * is properly treated. | |
2304 | */ | |
2305 | void scsi_report_device_reset(struct Scsi_Host *shost, int channel, int target) | |
2306 | { | |
2307 | struct scsi_device *sdev; | |
2308 | ||
2309 | __shost_for_each_device(sdev, shost) { | |
422c0d61 | 2310 | if (channel == sdev_channel(sdev) && |
30bd7df8 MC |
2311 | target == sdev_id(sdev)) |
2312 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
2313 | } |
2314 | } | |
2315 | EXPORT_SYMBOL(scsi_report_device_reset); | |
2316 | ||
2317 | static void | |
2318 | scsi_reset_provider_done_command(struct scsi_cmnd *scmd) | |
2319 | { | |
2320 | } | |
2321 | ||
176aa9d6 CH |
2322 | /** |
2323 | * scsi_ioctl_reset: explicitly reset a host/bus/target/device | |
2324 | * @dev: scsi_device to operate on | |
2325 | * @arg: reset type (see sg.h) | |
1da177e4 LT |
2326 | */ |
2327 | int | |
176aa9d6 | 2328 | scsi_ioctl_reset(struct scsi_device *dev, int __user *arg) |
1da177e4 | 2329 | { |
bc4f2401 | 2330 | struct scsi_cmnd *scmd; |
d7a1bb0a | 2331 | struct Scsi_Host *shost = dev->host; |
e9c787e6 | 2332 | struct request *rq; |
d7a1bb0a | 2333 | unsigned long flags; |
176aa9d6 CH |
2334 | int error = 0, rtn, val; |
2335 | ||
2336 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2337 | return -EACCES; | |
2338 | ||
2339 | error = get_user(val, arg); | |
2340 | if (error) | |
2341 | return error; | |
1da177e4 | 2342 | |
bc4f2401 | 2343 | if (scsi_autopm_get_host(shost) < 0) |
176aa9d6 | 2344 | return -EIO; |
bc4f2401 | 2345 | |
176aa9d6 | 2346 | error = -EIO; |
e9c787e6 CH |
2347 | rq = kzalloc(sizeof(struct request) + sizeof(struct scsi_cmnd) + |
2348 | shost->hostt->cmd_size, GFP_KERNEL); | |
2349 | if (!rq) | |
95eeb5f5 | 2350 | goto out_put_autopm_host; |
e9c787e6 | 2351 | blk_rq_init(NULL, rq); |
95eeb5f5 | 2352 | |
e9c787e6 CH |
2353 | scmd = (struct scsi_cmnd *)(rq + 1); |
2354 | scsi_init_command(dev, scmd); | |
2355 | scmd->request = rq; | |
82ed4db4 | 2356 | scmd->cmnd = scsi_req(rq)->cmd; |
64a87b24 | 2357 | |
1da177e4 | 2358 | scmd->scsi_done = scsi_reset_provider_done_command; |
30b0c37b | 2359 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
1da177e4 LT |
2360 | |
2361 | scmd->cmd_len = 0; | |
2362 | ||
2363 | scmd->sc_data_direction = DMA_BIDIRECTIONAL; | |
1da177e4 | 2364 | |
d7a1bb0a JS |
2365 | spin_lock_irqsave(shost->host_lock, flags); |
2366 | shost->tmf_in_progress = 1; | |
2367 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2368 | ||
176aa9d6 CH |
2369 | switch (val & ~SG_SCSI_RESET_NO_ESCALATE) { |
2370 | case SG_SCSI_RESET_NOTHING: | |
2371 | rtn = SUCCESS; | |
2372 | break; | |
2373 | case SG_SCSI_RESET_DEVICE: | |
1da177e4 | 2374 | rtn = scsi_try_bus_device_reset(scmd); |
176aa9d6 | 2375 | if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE)) |
1da177e4 LT |
2376 | break; |
2377 | /* FALLTHROUGH */ | |
176aa9d6 | 2378 | case SG_SCSI_RESET_TARGET: |
30bd7df8 | 2379 | rtn = scsi_try_target_reset(scmd); |
176aa9d6 | 2380 | if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE)) |
30bd7df8 MC |
2381 | break; |
2382 | /* FALLTHROUGH */ | |
176aa9d6 | 2383 | case SG_SCSI_RESET_BUS: |
1da177e4 | 2384 | rtn = scsi_try_bus_reset(scmd); |
176aa9d6 | 2385 | if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE)) |
1da177e4 LT |
2386 | break; |
2387 | /* FALLTHROUGH */ | |
176aa9d6 | 2388 | case SG_SCSI_RESET_HOST: |
1da177e4 | 2389 | rtn = scsi_try_host_reset(scmd); |
176aa9d6 CH |
2390 | if (rtn == SUCCESS) |
2391 | break; | |
176aa9d6 | 2392 | /* FALLTHROUGH */ |
3bf2ff67 | 2393 | default: |
1da177e4 | 2394 | rtn = FAILED; |
176aa9d6 | 2395 | break; |
1da177e4 LT |
2396 | } |
2397 | ||
176aa9d6 CH |
2398 | error = (rtn == SUCCESS) ? 0 : -EIO; |
2399 | ||
d7a1bb0a JS |
2400 | spin_lock_irqsave(shost->host_lock, flags); |
2401 | shost->tmf_in_progress = 0; | |
2402 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2403 | ||
2404 | /* | |
2405 | * be sure to wake up anyone who was sleeping or had their queue | |
2406 | * suspended while we performed the TMF. | |
2407 | */ | |
2408 | SCSI_LOG_ERROR_RECOVERY(3, | |
91921e01 HR |
2409 | shost_printk(KERN_INFO, shost, |
2410 | "waking up host to restart after TMF\n")); | |
d7a1bb0a JS |
2411 | |
2412 | wake_up(&shost->host_wait); | |
d7a1bb0a JS |
2413 | scsi_run_host_queues(shost); |
2414 | ||
0f121dd8 | 2415 | scsi_put_command(scmd); |
e9c787e6 | 2416 | kfree(rq); |
0f121dd8 | 2417 | |
04796336 | 2418 | out_put_autopm_host: |
bc4f2401 | 2419 | scsi_autopm_put_host(shost); |
176aa9d6 | 2420 | return error; |
1da177e4 | 2421 | } |
1da177e4 | 2422 | |
4753cbc0 HR |
2423 | bool scsi_command_normalize_sense(const struct scsi_cmnd *cmd, |
2424 | struct scsi_sense_hdr *sshdr) | |
1da177e4 LT |
2425 | { |
2426 | return scsi_normalize_sense(cmd->sense_buffer, | |
b80ca4f7 | 2427 | SCSI_SENSE_BUFFERSIZE, sshdr); |
1da177e4 LT |
2428 | } |
2429 | EXPORT_SYMBOL(scsi_command_normalize_sense); | |
2430 | ||
1da177e4 | 2431 | /** |
eb44820c | 2432 | * scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor format) |
1da177e4 LT |
2433 | * @sense_buffer: byte array of sense data |
2434 | * @sb_len: number of valid bytes in sense_buffer | |
2435 | * @info_out: pointer to 64 integer where 8 or 4 byte information | |
2436 | * field will be placed if found. | |
2437 | * | |
2438 | * Return value: | |
2908769c | 2439 | * true if information field found, false if not found. |
dc8875e1 | 2440 | */ |
2908769c DLM |
2441 | bool scsi_get_sense_info_fld(const u8 *sense_buffer, int sb_len, |
2442 | u64 *info_out) | |
1da177e4 | 2443 | { |
1da177e4 | 2444 | const u8 * ucp; |
1da177e4 LT |
2445 | |
2446 | if (sb_len < 7) | |
2908769c | 2447 | return false; |
1da177e4 LT |
2448 | switch (sense_buffer[0] & 0x7f) { |
2449 | case 0x70: | |
2450 | case 0x71: | |
2451 | if (sense_buffer[0] & 0x80) { | |
2908769c DLM |
2452 | *info_out = get_unaligned_be32(&sense_buffer[3]); |
2453 | return true; | |
2454 | } | |
2455 | return false; | |
1da177e4 LT |
2456 | case 0x72: |
2457 | case 0x73: | |
2458 | ucp = scsi_sense_desc_find(sense_buffer, sb_len, | |
2459 | 0 /* info desc */); | |
2460 | if (ucp && (0xa == ucp[1])) { | |
2908769c DLM |
2461 | *info_out = get_unaligned_be64(&ucp[4]); |
2462 | return true; | |
2463 | } | |
2464 | return false; | |
1da177e4 | 2465 | default: |
2908769c | 2466 | return false; |
1da177e4 LT |
2467 | } |
2468 | } | |
2469 | EXPORT_SYMBOL(scsi_get_sense_info_fld); |