Commit | Line | Data |
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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); |
b8e162f9 BVA |
63 | static enum scsi_disposition 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 | ||
2a242d59 MC |
119 | static bool scsi_cmd_retry_allowed(struct scsi_cmnd *cmd) |
120 | { | |
121 | if (cmd->allowed == SCSI_CMD_RETRIES_NO_LIMIT) | |
122 | return true; | |
123 | ||
124 | return ++cmd->retries <= cmd->allowed; | |
125 | } | |
126 | ||
60bee27b MK |
127 | static bool scsi_eh_should_retry_cmd(struct scsi_cmnd *cmd) |
128 | { | |
129 | struct scsi_device *sdev = cmd->device; | |
130 | struct Scsi_Host *host = sdev->host; | |
131 | ||
132 | if (host->hostt->eh_should_retry_cmd) | |
133 | return host->hostt->eh_should_retry_cmd(cmd); | |
134 | ||
135 | return true; | |
136 | } | |
137 | ||
e494f6a7 HR |
138 | /** |
139 | * scmd_eh_abort_handler - Handle command aborts | |
140 | * @work: command to be aborted. | |
923f46f9 BVA |
141 | * |
142 | * Note: this function must be called only for a command that has timed out. | |
143 | * Because the block layer marks a request as complete before it calls | |
144 | * scsi_times_out(), a .scsi_done() call from the LLD for a command that has | |
145 | * timed out do not have any effect. Hence it is safe to call | |
146 | * scsi_finish_command() from this function. | |
e494f6a7 HR |
147 | */ |
148 | void | |
149 | scmd_eh_abort_handler(struct work_struct *work) | |
150 | { | |
151 | struct scsi_cmnd *scmd = | |
152 | container_of(work, struct scsi_cmnd, abort_work.work); | |
153 | struct scsi_device *sdev = scmd->device; | |
b8e162f9 | 154 | enum scsi_disposition rtn; |
e494f6a7 | 155 | |
e494f6a7 | 156 | if (scsi_host_eh_past_deadline(sdev->host)) { |
e494f6a7 HR |
157 | SCSI_LOG_ERROR_RECOVERY(3, |
158 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 159 | "eh timeout, not aborting\n")); |
e494f6a7 | 160 | } else { |
e494f6a7 HR |
161 | SCSI_LOG_ERROR_RECOVERY(3, |
162 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 163 | "aborting command\n")); |
e494f6a7 HR |
164 | rtn = scsi_try_to_abort_cmd(sdev->host->hostt, scmd); |
165 | if (rtn == SUCCESS) { | |
8922a908 | 166 | set_host_byte(scmd, DID_TIME_OUT); |
bb3b621a RM |
167 | if (scsi_host_eh_past_deadline(sdev->host)) { |
168 | SCSI_LOG_ERROR_RECOVERY(3, | |
169 | scmd_printk(KERN_INFO, scmd, | |
470613b4 HR |
170 | "eh timeout, not retrying " |
171 | "aborted command\n")); | |
bb3b621a | 172 | } else if (!scsi_noretry_cmd(scmd) && |
60bee27b MK |
173 | scsi_cmd_retry_allowed(scmd) && |
174 | scsi_eh_should_retry_cmd(scmd)) { | |
e494f6a7 HR |
175 | SCSI_LOG_ERROR_RECOVERY(3, |
176 | scmd_printk(KERN_WARNING, scmd, | |
470613b4 | 177 | "retry aborted command\n")); |
e494f6a7 | 178 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); |
bb3b621a | 179 | return; |
e494f6a7 HR |
180 | } else { |
181 | SCSI_LOG_ERROR_RECOVERY(3, | |
182 | scmd_printk(KERN_WARNING, scmd, | |
470613b4 | 183 | "finish aborted command\n")); |
e494f6a7 | 184 | scsi_finish_command(scmd); |
bb3b621a | 185 | return; |
e494f6a7 | 186 | } |
bb3b621a RM |
187 | } else { |
188 | SCSI_LOG_ERROR_RECOVERY(3, | |
189 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 190 | "cmd abort %s\n", |
883a030f HR |
191 | (rtn == FAST_IO_FAIL) ? |
192 | "not send" : "failed")); | |
e494f6a7 | 193 | } |
e494f6a7 HR |
194 | } |
195 | ||
a0658632 | 196 | scsi_eh_scmd_add(scmd); |
e494f6a7 HR |
197 | } |
198 | ||
199 | /** | |
200 | * scsi_abort_command - schedule a command abort | |
201 | * @scmd: scmd to abort. | |
202 | * | |
203 | * We only need to abort commands after a command timeout | |
204 | */ | |
205 | static int | |
206 | scsi_abort_command(struct scsi_cmnd *scmd) | |
207 | { | |
208 | struct scsi_device *sdev = scmd->device; | |
209 | struct Scsi_Host *shost = sdev->host; | |
210 | unsigned long flags; | |
211 | ||
212 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) { | |
213 | /* | |
214 | * Retry after abort failed, escalate to next level. | |
215 | */ | |
216 | SCSI_LOG_ERROR_RECOVERY(3, | |
217 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 218 | "previous abort failed\n")); |
fcc95a76 | 219 | BUG_ON(delayed_work_pending(&scmd->abort_work)); |
e494f6a7 HR |
220 | return FAILED; |
221 | } | |
222 | ||
e494f6a7 | 223 | spin_lock_irqsave(shost->host_lock, flags); |
bb3b621a | 224 | if (shost->eh_deadline != -1 && !shost->last_reset) |
e494f6a7 HR |
225 | shost->last_reset = jiffies; |
226 | spin_unlock_irqrestore(shost->host_lock, flags); | |
227 | ||
228 | scmd->eh_eflags |= SCSI_EH_ABORT_SCHEDULED; | |
229 | SCSI_LOG_ERROR_RECOVERY(3, | |
470613b4 | 230 | scmd_printk(KERN_INFO, scmd, "abort scheduled\n")); |
e494f6a7 HR |
231 | queue_delayed_work(shost->tmf_work_q, &scmd->abort_work, HZ / 100); |
232 | return SUCCESS; | |
233 | } | |
234 | ||
1da177e4 | 235 | /** |
7a38dc0b | 236 | * scsi_eh_reset - call into ->eh_action to reset internal counters |
1da177e4 | 237 | * @scmd: scmd to run eh on. |
1da177e4 | 238 | * |
7a38dc0b HR |
239 | * The scsi driver might be carrying internal state about the |
240 | * devices, so we need to call into the driver to reset the | |
241 | * internal state once the error handler is started. | |
dc8875e1 | 242 | */ |
7a38dc0b HR |
243 | static void scsi_eh_reset(struct scsi_cmnd *scmd) |
244 | { | |
245 | if (!blk_rq_is_passthrough(scmd->request)) { | |
246 | struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd); | |
247 | if (sdrv->eh_reset) | |
248 | sdrv->eh_reset(scmd); | |
249 | } | |
250 | } | |
251 | ||
3bd6f43f BVA |
252 | static void scsi_eh_inc_host_failed(struct rcu_head *head) |
253 | { | |
3be8828f BVA |
254 | struct scsi_cmnd *scmd = container_of(head, typeof(*scmd), rcu); |
255 | struct Scsi_Host *shost = scmd->device->host; | |
3bd6f43f BVA |
256 | unsigned long flags; |
257 | ||
258 | spin_lock_irqsave(shost->host_lock, flags); | |
259 | shost->host_failed++; | |
260 | scsi_eh_wakeup(shost); | |
261 | spin_unlock_irqrestore(shost->host_lock, flags); | |
262 | } | |
263 | ||
1da177e4 LT |
264 | /** |
265 | * scsi_eh_scmd_add - add scsi cmd to error handling. | |
266 | * @scmd: scmd to run eh on. | |
dc8875e1 | 267 | */ |
a0658632 | 268 | void scsi_eh_scmd_add(struct scsi_cmnd *scmd) |
1da177e4 LT |
269 | { |
270 | struct Scsi_Host *shost = scmd->device->host; | |
271 | unsigned long flags; | |
2171b6d0 | 272 | int ret; |
1da177e4 | 273 | |
2171b6d0 | 274 | WARN_ON_ONCE(!shost->ehandler); |
1da177e4 LT |
275 | |
276 | spin_lock_irqsave(shost->host_lock, flags); | |
2171b6d0 HR |
277 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) { |
278 | ret = scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY); | |
279 | WARN_ON_ONCE(ret); | |
280 | } | |
bb3b621a | 281 | if (shost->eh_deadline != -1 && !shost->last_reset) |
b4562022 HR |
282 | shost->last_reset = jiffies; |
283 | ||
7a38dc0b | 284 | scsi_eh_reset(scmd); |
1da177e4 | 285 | list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q); |
1da177e4 | 286 | spin_unlock_irqrestore(shost->host_lock, flags); |
3bd6f43f BVA |
287 | /* |
288 | * Ensure that all tasks observe the host state change before the | |
289 | * host_failed change. | |
290 | */ | |
3be8828f | 291 | call_rcu(&scmd->rcu, scsi_eh_inc_host_failed); |
1da177e4 LT |
292 | } |
293 | ||
1da177e4 LT |
294 | /** |
295 | * scsi_times_out - Timeout function for normal scsi commands. | |
242f9dcb | 296 | * @req: request that is timing out. |
1da177e4 LT |
297 | * |
298 | * Notes: | |
299 | * We do not need to lock this. There is the potential for a race | |
300 | * only in that the normal completion handling might run, but if the | |
301 | * normal completion function determines that the timer has already | |
302 | * fired, then it mustn't do anything. | |
dc8875e1 | 303 | */ |
242f9dcb | 304 | enum blk_eh_timer_return scsi_times_out(struct request *req) |
1da177e4 | 305 | { |
bed2213d | 306 | struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(req); |
6600593c | 307 | enum blk_eh_timer_return rtn = BLK_EH_DONE; |
0bf8c869 | 308 | struct Scsi_Host *host = scmd->device->host; |
6c5f8ce1 | 309 | |
bf816235 | 310 | trace_scsi_dispatch_cmd_timeout(scmd); |
1da177e4 LT |
311 | scsi_log_completion(scmd, TIMEOUT_ERROR); |
312 | ||
bb3b621a | 313 | if (host->eh_deadline != -1 && !host->last_reset) |
b4562022 HR |
314 | host->last_reset = jiffies; |
315 | ||
b6a05c82 | 316 | if (host->hostt->eh_timed_out) |
0bf8c869 | 317 | rtn = host->hostt->eh_timed_out(scmd); |
1da177e4 | 318 | |
6600593c | 319 | if (rtn == BLK_EH_DONE) { |
065990bd | 320 | /* |
f1342709 KB |
321 | * Set the command to complete first in order to prevent a real |
322 | * completion from releasing the command while error handling | |
323 | * is using it. If the command was already completed, then the | |
324 | * lower level driver beat the timeout handler, and it is safe | |
325 | * to return without escalating error recovery. | |
065990bd | 326 | * |
f1342709 KB |
327 | * If timeout handling lost the race to a real completion, the |
328 | * block layer may ignore that due to a fake timeout injection, | |
329 | * so return RESET_TIMER to allow error handling another shot | |
330 | * at this command. | |
065990bd | 331 | */ |
f1342709 KB |
332 | if (test_and_set_bit(SCMD_STATE_COMPLETE, &scmd->state)) |
333 | return BLK_EH_RESET_TIMER; | |
a0658632 | 334 | if (scsi_abort_command(scmd) != SUCCESS) { |
2171b6d0 | 335 | set_host_byte(scmd, DID_TIME_OUT); |
a0658632 | 336 | scsi_eh_scmd_add(scmd); |
2171b6d0 | 337 | } |
a33c070b | 338 | } |
242f9dcb | 339 | |
fa990781 | 340 | return rtn; |
1da177e4 LT |
341 | } |
342 | ||
343 | /** | |
344 | * scsi_block_when_processing_errors - Prevent cmds from being queued. | |
345 | * @sdev: Device on which we are performing recovery. | |
346 | * | |
347 | * Description: | |
348 | * We block until the host is out of error recovery, and then check to | |
349 | * see whether the host or the device is offline. | |
350 | * | |
351 | * Return value: | |
352 | * 0 when dev was taken offline by error recovery. 1 OK to proceed. | |
dc8875e1 | 353 | */ |
1da177e4 LT |
354 | int scsi_block_when_processing_errors(struct scsi_device *sdev) |
355 | { | |
356 | int online; | |
357 | ||
939647ee | 358 | wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host)); |
1da177e4 LT |
359 | |
360 | online = scsi_device_online(sdev); | |
361 | ||
1da177e4 LT |
362 | return online; |
363 | } | |
364 | EXPORT_SYMBOL(scsi_block_when_processing_errors); | |
365 | ||
366 | #ifdef CONFIG_SCSI_LOGGING | |
367 | /** | |
368 | * scsi_eh_prt_fail_stats - Log info on failures. | |
369 | * @shost: scsi host being recovered. | |
370 | * @work_q: Queue of scsi cmds to process. | |
dc8875e1 | 371 | */ |
1da177e4 LT |
372 | static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost, |
373 | struct list_head *work_q) | |
374 | { | |
375 | struct scsi_cmnd *scmd; | |
376 | struct scsi_device *sdev; | |
377 | int total_failures = 0; | |
378 | int cmd_failed = 0; | |
379 | int cmd_cancel = 0; | |
380 | int devices_failed = 0; | |
381 | ||
382 | shost_for_each_device(sdev, shost) { | |
383 | list_for_each_entry(scmd, work_q, eh_entry) { | |
384 | if (scmd->device == sdev) { | |
385 | ++total_failures; | |
a0658632 | 386 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) |
1da177e4 | 387 | ++cmd_cancel; |
0bf8c869 | 388 | else |
1da177e4 LT |
389 | ++cmd_failed; |
390 | } | |
391 | } | |
392 | ||
393 | if (cmd_cancel || cmd_failed) { | |
394 | SCSI_LOG_ERROR_RECOVERY(3, | |
a3a790dc | 395 | shost_printk(KERN_INFO, shost, |
9ccfc756 | 396 | "%s: cmds failed: %d, cancel: %d\n", |
cadbd4a5 | 397 | __func__, cmd_failed, |
9ccfc756 | 398 | cmd_cancel)); |
1da177e4 LT |
399 | cmd_cancel = 0; |
400 | cmd_failed = 0; | |
401 | ++devices_failed; | |
402 | } | |
403 | } | |
404 | ||
91921e01 HR |
405 | SCSI_LOG_ERROR_RECOVERY(2, shost_printk(KERN_INFO, shost, |
406 | "Total of %d commands on %d" | |
407 | " devices require eh work\n", | |
0bf8c869 | 408 | total_failures, devices_failed)); |
1da177e4 LT |
409 | } |
410 | #endif | |
411 | ||
279afdfe EM |
412 | /** |
413 | * scsi_report_lun_change - Set flag on all *other* devices on the same target | |
414 | * to indicate that a UNIT ATTENTION is expected. | |
415 | * @sdev: Device reporting the UNIT ATTENTION | |
416 | */ | |
417 | static void scsi_report_lun_change(struct scsi_device *sdev) | |
418 | { | |
419 | sdev->sdev_target->expecting_lun_change = 1; | |
420 | } | |
421 | ||
422 | /** | |
423 | * scsi_report_sense - Examine scsi sense information and log messages for | |
424 | * certain conditions, also issue uevents for some of them. | |
425 | * @sdev: Device reporting the sense code | |
426 | * @sshdr: sshdr to be examined | |
427 | */ | |
428 | static void scsi_report_sense(struct scsi_device *sdev, | |
429 | struct scsi_sense_hdr *sshdr) | |
430 | { | |
431 | enum scsi_device_event evt_type = SDEV_EVT_MAXBITS; /* i.e. none */ | |
432 | ||
433 | if (sshdr->sense_key == UNIT_ATTENTION) { | |
434 | if (sshdr->asc == 0x3f && sshdr->ascq == 0x03) { | |
435 | evt_type = SDEV_EVT_INQUIRY_CHANGE_REPORTED; | |
436 | sdev_printk(KERN_WARNING, sdev, | |
437 | "Inquiry data has changed"); | |
438 | } else if (sshdr->asc == 0x3f && sshdr->ascq == 0x0e) { | |
439 | evt_type = SDEV_EVT_LUN_CHANGE_REPORTED; | |
440 | scsi_report_lun_change(sdev); | |
441 | sdev_printk(KERN_WARNING, sdev, | |
442 | "Warning! Received an indication that the " | |
443 | "LUN assignments on this target have " | |
444 | "changed. The Linux SCSI layer does not " | |
445 | "automatically remap LUN assignments.\n"); | |
446 | } else if (sshdr->asc == 0x3f) | |
447 | sdev_printk(KERN_WARNING, sdev, | |
448 | "Warning! Received an indication that the " | |
449 | "operating parameters on this target have " | |
450 | "changed. The Linux SCSI layer does not " | |
451 | "automatically adjust these parameters.\n"); | |
452 | ||
453 | if (sshdr->asc == 0x38 && sshdr->ascq == 0x07) { | |
454 | evt_type = SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED; | |
455 | sdev_printk(KERN_WARNING, sdev, | |
456 | "Warning! Received an indication that the " | |
457 | "LUN reached a thin provisioning soft " | |
458 | "threshold.\n"); | |
459 | } | |
460 | ||
cf3431bb HR |
461 | if (sshdr->asc == 0x29) { |
462 | evt_type = SDEV_EVT_POWER_ON_RESET_OCCURRED; | |
463 | sdev_printk(KERN_WARNING, sdev, | |
464 | "Power-on or device reset occurred\n"); | |
465 | } | |
466 | ||
279afdfe EM |
467 | if (sshdr->asc == 0x2a && sshdr->ascq == 0x01) { |
468 | evt_type = SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED; | |
469 | sdev_printk(KERN_WARNING, sdev, | |
470 | "Mode parameters changed"); | |
14c3e677 HR |
471 | } else if (sshdr->asc == 0x2a && sshdr->ascq == 0x06) { |
472 | evt_type = SDEV_EVT_ALUA_STATE_CHANGE_REPORTED; | |
473 | sdev_printk(KERN_WARNING, sdev, | |
474 | "Asymmetric access state changed"); | |
279afdfe EM |
475 | } else if (sshdr->asc == 0x2a && sshdr->ascq == 0x09) { |
476 | evt_type = SDEV_EVT_CAPACITY_CHANGE_REPORTED; | |
477 | sdev_printk(KERN_WARNING, sdev, | |
478 | "Capacity data has changed"); | |
479 | } else if (sshdr->asc == 0x2a) | |
480 | sdev_printk(KERN_WARNING, sdev, | |
481 | "Parameters changed"); | |
482 | } | |
483 | ||
484 | if (evt_type != SDEV_EVT_MAXBITS) { | |
485 | set_bit(evt_type, sdev->pending_events); | |
486 | schedule_work(&sdev->event_work); | |
487 | } | |
488 | } | |
489 | ||
1da177e4 LT |
490 | /** |
491 | * scsi_check_sense - Examine scsi cmd sense | |
492 | * @scmd: Cmd to have sense checked. | |
493 | * | |
494 | * Return value: | |
87f14e65 | 495 | * SUCCESS or FAILED or NEEDS_RETRY or ADD_TO_MLQUEUE |
1da177e4 LT |
496 | * |
497 | * Notes: | |
498 | * When a deferred error is detected the current command has | |
499 | * not been executed and needs retrying. | |
dc8875e1 | 500 | */ |
b8e162f9 | 501 | enum scsi_disposition scsi_check_sense(struct scsi_cmnd *scmd) |
1da177e4 | 502 | { |
a6a8d9f8 | 503 | struct scsi_device *sdev = scmd->device; |
1da177e4 LT |
504 | struct scsi_sense_hdr sshdr; |
505 | ||
506 | if (! scsi_command_normalize_sense(scmd, &sshdr)) | |
507 | return FAILED; /* no valid sense data */ | |
508 | ||
279afdfe EM |
509 | scsi_report_sense(sdev, &sshdr); |
510 | ||
1da177e4 LT |
511 | if (scsi_sense_is_deferred(&sshdr)) |
512 | return NEEDS_RETRY; | |
513 | ||
ee14c674 | 514 | if (sdev->handler && sdev->handler->check_sense) { |
b8e162f9 | 515 | enum scsi_disposition rc; |
a6a8d9f8 | 516 | |
ee14c674 | 517 | rc = sdev->handler->check_sense(sdev, &sshdr); |
a6a8d9f8 CS |
518 | if (rc != SCSI_RETURN_NOT_HANDLED) |
519 | return rc; | |
520 | /* handler does not care. Drop down to default handling */ | |
521 | } | |
522 | ||
e925cc43 CH |
523 | if (scmd->cmnd[0] == TEST_UNIT_READY && scmd->scsi_done != scsi_eh_done) |
524 | /* | |
525 | * nasty: for mid-layer issued TURs, we need to return the | |
526 | * actual sense data without any recovery attempt. For eh | |
527 | * issued ones, we need to try to recover and interpret | |
528 | */ | |
529 | return SUCCESS; | |
530 | ||
1da177e4 LT |
531 | /* |
532 | * Previous logic looked for FILEMARK, EOM or ILI which are | |
533 | * mainly associated with tapes and returned SUCCESS. | |
534 | */ | |
535 | if (sshdr.response_code == 0x70) { | |
536 | /* fixed format */ | |
537 | if (scmd->sense_buffer[2] & 0xe0) | |
538 | return SUCCESS; | |
539 | } else { | |
540 | /* | |
541 | * descriptor format: look for "stream commands sense data | |
542 | * descriptor" (see SSC-3). Assume single sense data | |
543 | * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG. | |
544 | */ | |
545 | if ((sshdr.additional_length > 3) && | |
546 | (scmd->sense_buffer[8] == 0x4) && | |
547 | (scmd->sense_buffer[11] & 0xe0)) | |
548 | return SUCCESS; | |
549 | } | |
550 | ||
551 | switch (sshdr.sense_key) { | |
552 | case NO_SENSE: | |
553 | return SUCCESS; | |
554 | case RECOVERED_ERROR: | |
555 | return /* soft_error */ SUCCESS; | |
556 | ||
557 | case ABORTED_COMMAND: | |
511e44f4 MP |
558 | if (sshdr.asc == 0x10) /* DIF */ |
559 | return SUCCESS; | |
560 | ||
29cfc2ab MW |
561 | if (sshdr.asc == 0x44 && sdev->sdev_bflags & BLIST_RETRY_ITF) |
562 | return ADD_TO_MLQUEUE; | |
c3606520 MW |
563 | if (sshdr.asc == 0xc1 && sshdr.ascq == 0x01 && |
564 | sdev->sdev_bflags & BLIST_RETRY_ASC_C1) | |
565 | return ADD_TO_MLQUEUE; | |
29cfc2ab | 566 | |
1da177e4 LT |
567 | return NEEDS_RETRY; |
568 | case NOT_READY: | |
569 | case UNIT_ATTENTION: | |
570 | /* | |
571 | * if we are expecting a cc/ua because of a bus reset that we | |
572 | * performed, treat this just as a retry. otherwise this is | |
573 | * information that we should pass up to the upper-level driver | |
574 | * so that we can deal with it there. | |
575 | */ | |
576 | if (scmd->device->expecting_cc_ua) { | |
dfcf7775 TH |
577 | /* |
578 | * Because some device does not queue unit | |
579 | * attentions correctly, we carefully check | |
580 | * additional sense code and qualifier so as | |
581 | * not to squash media change unit attention. | |
582 | */ | |
583 | if (sshdr.asc != 0x28 || sshdr.ascq != 0x00) { | |
584 | scmd->device->expecting_cc_ua = 0; | |
585 | return NEEDS_RETRY; | |
586 | } | |
1da177e4 | 587 | } |
279afdfe EM |
588 | /* |
589 | * we might also expect a cc/ua if another LUN on the target | |
590 | * reported a UA with an ASC/ASCQ of 3F 0E - | |
591 | * REPORTED LUNS DATA HAS CHANGED. | |
592 | */ | |
593 | if (scmd->device->sdev_target->expecting_lun_change && | |
594 | sshdr.asc == 0x3f && sshdr.ascq == 0x0e) | |
595 | return NEEDS_RETRY; | |
1da177e4 | 596 | /* |
0bf8c869 | 597 | * if the device is in the process of becoming ready, we |
1da177e4 LT |
598 | * should retry. |
599 | */ | |
600 | if ((sshdr.asc == 0x04) && (sshdr.ascq == 0x01)) | |
601 | return NEEDS_RETRY; | |
602 | /* | |
603 | * if the device is not started, we need to wake | |
604 | * the error handler to start the motor | |
605 | */ | |
606 | if (scmd->device->allow_restart && | |
607 | (sshdr.asc == 0x04) && (sshdr.ascq == 0x02)) | |
608 | return FAILED; | |
02e031cb CH |
609 | /* |
610 | * Pass the UA upwards for a determination in the completion | |
611 | * functions. | |
612 | */ | |
613 | return SUCCESS; | |
1da177e4 | 614 | |
63583cca | 615 | /* these are not supported */ |
a9d6ceb8 HR |
616 | case DATA_PROTECT: |
617 | if (sshdr.asc == 0x27 && sshdr.ascq == 0x07) { | |
618 | /* Thin provisioning hard threshold reached */ | |
619 | set_host_byte(scmd, DID_ALLOC_FAILURE); | |
620 | return SUCCESS; | |
621 | } | |
df561f66 | 622 | fallthrough; |
1da177e4 LT |
623 | case COPY_ABORTED: |
624 | case VOLUME_OVERFLOW: | |
625 | case MISCOMPARE: | |
63583cca | 626 | case BLANK_CHECK: |
87f14e65 HR |
627 | set_host_byte(scmd, DID_TARGET_FAILURE); |
628 | return SUCCESS; | |
1da177e4 LT |
629 | |
630 | case MEDIUM_ERROR: | |
fd1b494d LT |
631 | if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */ |
632 | sshdr.asc == 0x13 || /* AMNF DATA FIELD */ | |
633 | sshdr.asc == 0x14) { /* RECORD NOT FOUND */ | |
7e782af5 | 634 | set_host_byte(scmd, DID_MEDIUM_ERROR); |
87f14e65 | 635 | return SUCCESS; |
fd1b494d | 636 | } |
1da177e4 LT |
637 | return NEEDS_RETRY; |
638 | ||
639 | case HARDWARE_ERROR: | |
640 | if (scmd->device->retry_hwerror) | |
bb0003c1 | 641 | return ADD_TO_MLQUEUE; |
1da177e4 | 642 | else |
87f14e65 | 643 | set_host_byte(scmd, DID_TARGET_FAILURE); |
df561f66 | 644 | fallthrough; |
1da177e4 LT |
645 | |
646 | case ILLEGAL_REQUEST: | |
47ac56db MS |
647 | if (sshdr.asc == 0x20 || /* Invalid command operation code */ |
648 | sshdr.asc == 0x21 || /* Logical block address out of range */ | |
a8bbb2ab | 649 | sshdr.asc == 0x22 || /* Invalid function */ |
47ac56db | 650 | sshdr.asc == 0x24 || /* Invalid field in cdb */ |
d0b7a909 MW |
651 | sshdr.asc == 0x26 || /* Parameter value invalid */ |
652 | sshdr.asc == 0x27) { /* Write protected */ | |
87f14e65 | 653 | set_host_byte(scmd, DID_TARGET_FAILURE); |
47ac56db MS |
654 | } |
655 | return SUCCESS; | |
656 | ||
1da177e4 LT |
657 | default: |
658 | return SUCCESS; | |
659 | } | |
660 | } | |
3852e373 | 661 | EXPORT_SYMBOL_GPL(scsi_check_sense); |
1da177e4 | 662 | |
4a84067d VD |
663 | static void scsi_handle_queue_ramp_up(struct scsi_device *sdev) |
664 | { | |
665 | struct scsi_host_template *sht = sdev->host->hostt; | |
666 | struct scsi_device *tmp_sdev; | |
667 | ||
c40ecc12 | 668 | if (!sht->track_queue_depth || |
4a84067d VD |
669 | sdev->queue_depth >= sdev->max_queue_depth) |
670 | return; | |
671 | ||
672 | if (time_before(jiffies, | |
673 | sdev->last_queue_ramp_up + sdev->queue_ramp_up_period)) | |
674 | return; | |
675 | ||
676 | if (time_before(jiffies, | |
677 | sdev->last_queue_full_time + sdev->queue_ramp_up_period)) | |
678 | return; | |
679 | ||
680 | /* | |
681 | * Walk all devices of a target and do | |
682 | * ramp up on them. | |
683 | */ | |
684 | shost_for_each_device(tmp_sdev, sdev->host) { | |
685 | if (tmp_sdev->channel != sdev->channel || | |
686 | tmp_sdev->id != sdev->id || | |
687 | tmp_sdev->queue_depth == sdev->max_queue_depth) | |
688 | continue; | |
c40ecc12 | 689 | |
db5ed4df | 690 | scsi_change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1); |
4a84067d VD |
691 | sdev->last_queue_ramp_up = jiffies; |
692 | } | |
693 | } | |
694 | ||
42a6a918 MC |
695 | static void scsi_handle_queue_full(struct scsi_device *sdev) |
696 | { | |
697 | struct scsi_host_template *sht = sdev->host->hostt; | |
698 | struct scsi_device *tmp_sdev; | |
699 | ||
c40ecc12 | 700 | if (!sht->track_queue_depth) |
42a6a918 MC |
701 | return; |
702 | ||
703 | shost_for_each_device(tmp_sdev, sdev->host) { | |
704 | if (tmp_sdev->channel != sdev->channel || | |
705 | tmp_sdev->id != sdev->id) | |
706 | continue; | |
707 | /* | |
708 | * We do not know the number of commands that were at | |
709 | * the device when we got the queue full so we start | |
710 | * from the highest possible value and work our way down. | |
711 | */ | |
c40ecc12 | 712 | scsi_track_queue_full(tmp_sdev, tmp_sdev->queue_depth - 1); |
42a6a918 MC |
713 | } |
714 | } | |
715 | ||
1da177e4 LT |
716 | /** |
717 | * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD. | |
718 | * @scmd: SCSI cmd to examine. | |
719 | * | |
720 | * Notes: | |
721 | * This is *only* called when we are examining the status of commands | |
722 | * queued during error recovery. the main difference here is that we | |
723 | * don't allow for the possibility of retries here, and we are a lot | |
724 | * more restrictive about what we consider acceptable. | |
dc8875e1 | 725 | */ |
b8e162f9 | 726 | static enum scsi_disposition scsi_eh_completed_normally(struct scsi_cmnd *scmd) |
1da177e4 LT |
727 | { |
728 | /* | |
729 | * first check the host byte, to see if there is anything in there | |
730 | * that would indicate what we need to do. | |
731 | */ | |
732 | if (host_byte(scmd->result) == DID_RESET) { | |
733 | /* | |
734 | * rats. we are already in the error handler, so we now | |
735 | * get to try and figure out what to do next. if the sense | |
736 | * is valid, we have a pretty good idea of what to do. | |
737 | * if not, we mark it as FAILED. | |
738 | */ | |
739 | return scsi_check_sense(scmd); | |
740 | } | |
741 | if (host_byte(scmd->result) != DID_OK) | |
742 | return FAILED; | |
743 | ||
744 | /* | |
745 | * next, check the message byte. | |
746 | */ | |
747 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
748 | return FAILED; | |
749 | ||
750 | /* | |
751 | * now, check the status byte to see if this indicates | |
752 | * anything special. | |
753 | */ | |
754 | switch (status_byte(scmd->result)) { | |
755 | case GOOD: | |
4a84067d | 756 | scsi_handle_queue_ramp_up(scmd->device); |
df561f66 | 757 | fallthrough; |
1da177e4 LT |
758 | case COMMAND_TERMINATED: |
759 | return SUCCESS; | |
760 | case CHECK_CONDITION: | |
761 | return scsi_check_sense(scmd); | |
762 | case CONDITION_GOOD: | |
763 | case INTERMEDIATE_GOOD: | |
764 | case INTERMEDIATE_C_GOOD: | |
765 | /* | |
766 | * who knows? FIXME(eric) | |
767 | */ | |
768 | return SUCCESS; | |
5f91bb05 | 769 | case RESERVATION_CONFLICT: |
67110dfd JB |
770 | if (scmd->cmnd[0] == TEST_UNIT_READY) |
771 | /* it is a success, we probed the device and | |
772 | * found it */ | |
773 | return SUCCESS; | |
774 | /* otherwise, we failed to send the command */ | |
775 | return FAILED; | |
1da177e4 | 776 | case QUEUE_FULL: |
42a6a918 | 777 | scsi_handle_queue_full(scmd->device); |
df561f66 | 778 | fallthrough; |
42a6a918 | 779 | case BUSY: |
3eb3a928 | 780 | return NEEDS_RETRY; |
1da177e4 LT |
781 | default: |
782 | return FAILED; | |
783 | } | |
784 | return FAILED; | |
785 | } | |
786 | ||
1da177e4 LT |
787 | /** |
788 | * scsi_eh_done - Completion function for error handling. | |
789 | * @scmd: Cmd that is done. | |
dc8875e1 | 790 | */ |
1da177e4 LT |
791 | static void scsi_eh_done(struct scsi_cmnd *scmd) |
792 | { | |
0bf8c869 | 793 | struct completion *eh_action; |
85631672 | 794 | |
91921e01 | 795 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
470613b4 | 796 | "%s result: %x\n", __func__, scmd->result)); |
85631672 MR |
797 | |
798 | eh_action = scmd->device->host->eh_action; | |
799 | if (eh_action) | |
800 | complete(eh_action); | |
1da177e4 LT |
801 | } |
802 | ||
292148f8 BK |
803 | /** |
804 | * scsi_try_host_reset - ask host adapter to reset itself | |
c2b3ebd0 | 805 | * @scmd: SCSI cmd to send host reset. |
dc8875e1 | 806 | */ |
b8e162f9 | 807 | static enum scsi_disposition scsi_try_host_reset(struct scsi_cmnd *scmd) |
292148f8 BK |
808 | { |
809 | unsigned long flags; | |
b8e162f9 | 810 | enum scsi_disposition rtn; |
0bf8c869 JJ |
811 | struct Scsi_Host *host = scmd->device->host; |
812 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 | 813 | |
91921e01 HR |
814 | SCSI_LOG_ERROR_RECOVERY(3, |
815 | shost_printk(KERN_INFO, host, "Snd Host RST\n")); | |
292148f8 | 816 | |
0bf8c869 | 817 | if (!hostt->eh_host_reset_handler) |
292148f8 BK |
818 | return FAILED; |
819 | ||
0bf8c869 | 820 | rtn = hostt->eh_host_reset_handler(scmd); |
292148f8 BK |
821 | |
822 | if (rtn == SUCCESS) { | |
0bf8c869 | 823 | if (!hostt->skip_settle_delay) |
292148f8 | 824 | ssleep(HOST_RESET_SETTLE_TIME); |
0bf8c869 JJ |
825 | spin_lock_irqsave(host->host_lock, flags); |
826 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
827 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
828 | } |
829 | ||
830 | return rtn; | |
831 | } | |
832 | ||
833 | /** | |
834 | * scsi_try_bus_reset - ask host to perform a bus reset | |
835 | * @scmd: SCSI cmd to send bus reset. | |
dc8875e1 | 836 | */ |
b8e162f9 | 837 | static enum scsi_disposition scsi_try_bus_reset(struct scsi_cmnd *scmd) |
292148f8 BK |
838 | { |
839 | unsigned long flags; | |
b8e162f9 | 840 | enum scsi_disposition rtn; |
0bf8c869 JJ |
841 | struct Scsi_Host *host = scmd->device->host; |
842 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 | 843 | |
91921e01 HR |
844 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
845 | "%s: Snd Bus RST\n", __func__)); | |
292148f8 | 846 | |
0bf8c869 | 847 | if (!hostt->eh_bus_reset_handler) |
292148f8 BK |
848 | return FAILED; |
849 | ||
0bf8c869 | 850 | rtn = hostt->eh_bus_reset_handler(scmd); |
292148f8 BK |
851 | |
852 | if (rtn == SUCCESS) { | |
0bf8c869 | 853 | if (!hostt->skip_settle_delay) |
292148f8 | 854 | ssleep(BUS_RESET_SETTLE_TIME); |
0bf8c869 JJ |
855 | spin_lock_irqsave(host->host_lock, flags); |
856 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
857 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
858 | } |
859 | ||
860 | return rtn; | |
861 | } | |
862 | ||
30bd7df8 MC |
863 | static void __scsi_report_device_reset(struct scsi_device *sdev, void *data) |
864 | { | |
865 | sdev->was_reset = 1; | |
866 | sdev->expecting_cc_ua = 1; | |
867 | } | |
868 | ||
869 | /** | |
870 | * scsi_try_target_reset - Ask host to perform a target reset | |
871 | * @scmd: SCSI cmd used to send a target reset | |
872 | * | |
873 | * Notes: | |
874 | * There is no timeout for this operation. if this operation is | |
875 | * unreliable for a given host, then the host itself needs to put a | |
876 | * timer on it, and set the host back to a consistent state prior to | |
877 | * returning. | |
878 | */ | |
b8e162f9 | 879 | static enum scsi_disposition scsi_try_target_reset(struct scsi_cmnd *scmd) |
30bd7df8 MC |
880 | { |
881 | unsigned long flags; | |
b8e162f9 | 882 | enum scsi_disposition rtn; |
0bf8c869 JJ |
883 | struct Scsi_Host *host = scmd->device->host; |
884 | struct scsi_host_template *hostt = host->hostt; | |
30bd7df8 | 885 | |
0bf8c869 | 886 | if (!hostt->eh_target_reset_handler) |
30bd7df8 MC |
887 | return FAILED; |
888 | ||
0bf8c869 | 889 | rtn = hostt->eh_target_reset_handler(scmd); |
30bd7df8 | 890 | if (rtn == SUCCESS) { |
0bf8c869 | 891 | spin_lock_irqsave(host->host_lock, flags); |
30bd7df8 MC |
892 | __starget_for_each_device(scsi_target(scmd->device), NULL, |
893 | __scsi_report_device_reset); | |
0bf8c869 | 894 | spin_unlock_irqrestore(host->host_lock, flags); |
30bd7df8 MC |
895 | } |
896 | ||
897 | return rtn; | |
898 | } | |
899 | ||
292148f8 BK |
900 | /** |
901 | * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev | |
902 | * @scmd: SCSI cmd used to send BDR | |
903 | * | |
904 | * Notes: | |
905 | * There is no timeout for this operation. if this operation is | |
906 | * unreliable for a given host, then the host itself needs to put a | |
907 | * timer on it, and set the host back to a consistent state prior to | |
908 | * returning. | |
dc8875e1 | 909 | */ |
b8e162f9 | 910 | static enum scsi_disposition scsi_try_bus_device_reset(struct scsi_cmnd *scmd) |
292148f8 | 911 | { |
b8e162f9 | 912 | enum scsi_disposition rtn; |
0bf8c869 | 913 | struct scsi_host_template *hostt = scmd->device->host->hostt; |
292148f8 | 914 | |
0bf8c869 | 915 | if (!hostt->eh_device_reset_handler) |
292148f8 BK |
916 | return FAILED; |
917 | ||
0bf8c869 | 918 | rtn = hostt->eh_device_reset_handler(scmd); |
30bd7df8 MC |
919 | if (rtn == SUCCESS) |
920 | __scsi_report_device_reset(scmd->device, NULL); | |
292148f8 BK |
921 | return rtn; |
922 | } | |
923 | ||
883a030f HR |
924 | /** |
925 | * scsi_try_to_abort_cmd - Ask host to abort a SCSI command | |
6583f6fb | 926 | * @hostt: SCSI driver host template |
883a030f HR |
927 | * @scmd: SCSI cmd used to send a target reset |
928 | * | |
929 | * Return value: | |
930 | * SUCCESS, FAILED, or FAST_IO_FAIL | |
931 | * | |
932 | * Notes: | |
933 | * SUCCESS does not necessarily indicate that the command | |
934 | * has been aborted; it only indicates that the LLDDs | |
935 | * has cleared all references to that command. | |
936 | * LLDDs should return FAILED only if an abort was required | |
937 | * but could not be executed. LLDDs should return FAST_IO_FAIL | |
938 | * if the device is temporarily unavailable (eg due to a | |
939 | * link down on FibreChannel) | |
940 | */ | |
b8e162f9 BVA |
941 | static enum scsi_disposition |
942 | scsi_try_to_abort_cmd(struct scsi_host_template *hostt, struct scsi_cmnd *scmd) | |
292148f8 | 943 | { |
0bf8c869 | 944 | if (!hostt->eh_abort_handler) |
292148f8 BK |
945 | return FAILED; |
946 | ||
0bf8c869 | 947 | return hostt->eh_abort_handler(scmd); |
292148f8 BK |
948 | } |
949 | ||
292148f8 BK |
950 | static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd) |
951 | { | |
0bf8c869 | 952 | if (scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd) != SUCCESS) |
292148f8 | 953 | if (scsi_try_bus_device_reset(scmd) != SUCCESS) |
30bd7df8 MC |
954 | if (scsi_try_target_reset(scmd) != SUCCESS) |
955 | if (scsi_try_bus_reset(scmd) != SUCCESS) | |
956 | scsi_try_host_reset(scmd); | |
292148f8 BK |
957 | } |
958 | ||
1da177e4 | 959 | /** |
3b729f76 | 960 | * scsi_eh_prep_cmnd - Save a scsi command info as part of error recovery |
2dc611de | 961 | * @scmd: SCSI command structure to hijack |
e1c23468 | 962 | * @ses: structure to save restore information |
55db6c1b | 963 | * @cmnd: CDB to send. Can be NULL if no new cmnd is needed |
64a87b24 | 964 | * @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB) |
55db6c1b | 965 | * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored) |
2dc611de | 966 | * |
e1c23468 | 967 | * This function is used to save a scsi command information before re-execution |
55db6c1b BH |
968 | * as part of the error recovery process. If @sense_bytes is 0 the command |
969 | * sent must be one that does not transfer any data. If @sense_bytes != 0 | |
970 | * @cmnd is ignored and this functions sets up a REQUEST_SENSE command | |
971 | * and cmnd buffers to read @sense_bytes into @scmd->sense_buffer. | |
dc8875e1 | 972 | */ |
e1c23468 BH |
973 | void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, |
974 | unsigned char *cmnd, int cmnd_size, unsigned sense_bytes) | |
1da177e4 | 975 | { |
f59114b7 | 976 | struct scsi_device *sdev = scmd->device; |
1da177e4 | 977 | |
631c228c CH |
978 | /* |
979 | * We need saved copies of a number of fields - this is because | |
980 | * error handling may need to overwrite these with different values | |
981 | * to run different commands, and once error handling is complete, | |
982 | * we will need to restore these values prior to running the actual | |
983 | * command. | |
984 | */ | |
e1c23468 | 985 | ses->cmd_len = scmd->cmd_len; |
64a87b24 | 986 | ses->cmnd = scmd->cmnd; |
e1c23468 | 987 | ses->data_direction = scmd->sc_data_direction; |
30b0c37b | 988 | ses->sdb = scmd->sdb; |
e1c23468 | 989 | ses->result = scmd->result; |
8f8fed0c | 990 | ses->resid_len = scmd->req.resid_len; |
12265709 | 991 | ses->underflow = scmd->underflow; |
db007fc5 | 992 | ses->prot_op = scmd->prot_op; |
8e8c9d01 | 993 | ses->eh_eflags = scmd->eh_eflags; |
631c228c | 994 | |
db007fc5 | 995 | scmd->prot_op = SCSI_PROT_NORMAL; |
c69e6f81 | 996 | scmd->eh_eflags = 0; |
64a87b24 BH |
997 | scmd->cmnd = ses->eh_cmnd; |
998 | memset(scmd->cmnd, 0, BLK_MAX_CDB); | |
30b0c37b | 999 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
644373a4 | 1000 | scmd->result = 0; |
8f8fed0c | 1001 | scmd->req.resid_len = 0; |
30b0c37b | 1002 | |
55db6c1b | 1003 | if (sense_bytes) { |
30b0c37b BH |
1004 | scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE, |
1005 | sense_bytes); | |
e1c23468 | 1006 | sg_init_one(&ses->sense_sgl, scmd->sense_buffer, |
30b0c37b BH |
1007 | scmd->sdb.length); |
1008 | scmd->sdb.table.sgl = &ses->sense_sgl; | |
55db6c1b | 1009 | scmd->sc_data_direction = DMA_FROM_DEVICE; |
0c958ecc | 1010 | scmd->sdb.table.nents = scmd->sdb.table.orig_nents = 1; |
55db6c1b | 1011 | scmd->cmnd[0] = REQUEST_SENSE; |
30b0c37b | 1012 | scmd->cmnd[4] = scmd->sdb.length; |
55db6c1b | 1013 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); |
631c228c | 1014 | } else { |
631c228c | 1015 | scmd->sc_data_direction = DMA_NONE; |
55db6c1b | 1016 | if (cmnd) { |
64a87b24 | 1017 | BUG_ON(cmnd_size > BLK_MAX_CDB); |
55db6c1b BH |
1018 | memcpy(scmd->cmnd, cmnd, cmnd_size); |
1019 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); | |
1020 | } | |
631c228c CH |
1021 | } |
1022 | ||
1023 | scmd->underflow = 0; | |
631c228c | 1024 | |
55db6c1b | 1025 | if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN) |
1da177e4 | 1026 | scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) | |
f59114b7 | 1027 | (sdev->lun << 5 & 0xe0); |
1da177e4 | 1028 | |
631c228c CH |
1029 | /* |
1030 | * Zero the sense buffer. The scsi spec mandates that any | |
1031 | * untransferred sense data should be interpreted as being zero. | |
1032 | */ | |
b80ca4f7 | 1033 | memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); |
e1c23468 BH |
1034 | } |
1035 | EXPORT_SYMBOL(scsi_eh_prep_cmnd); | |
1036 | ||
1037 | /** | |
3b729f76 | 1038 | * scsi_eh_restore_cmnd - Restore a scsi command info as part of error recovery |
e1c23468 | 1039 | * @scmd: SCSI command structure to restore |
477e608c | 1040 | * @ses: saved information from a coresponding call to scsi_eh_prep_cmnd |
e1c23468 | 1041 | * |
477e608c | 1042 | * Undo any damage done by above scsi_eh_prep_cmnd(). |
dc8875e1 | 1043 | */ |
e1c23468 BH |
1044 | void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses) |
1045 | { | |
1046 | /* | |
1047 | * Restore original data | |
1048 | */ | |
1049 | scmd->cmd_len = ses->cmd_len; | |
64a87b24 | 1050 | scmd->cmnd = ses->cmnd; |
e1c23468 | 1051 | scmd->sc_data_direction = ses->data_direction; |
30b0c37b | 1052 | scmd->sdb = ses->sdb; |
e1c23468 | 1053 | scmd->result = ses->result; |
8f8fed0c | 1054 | scmd->req.resid_len = ses->resid_len; |
12265709 | 1055 | scmd->underflow = ses->underflow; |
db007fc5 | 1056 | scmd->prot_op = ses->prot_op; |
8e8c9d01 | 1057 | scmd->eh_eflags = ses->eh_eflags; |
e1c23468 BH |
1058 | } |
1059 | EXPORT_SYMBOL(scsi_eh_restore_cmnd); | |
631c228c | 1060 | |
e1c23468 | 1061 | /** |
3b729f76 | 1062 | * scsi_send_eh_cmnd - submit a scsi command as part of error recovery |
e1c23468 BH |
1063 | * @scmd: SCSI command structure to hijack |
1064 | * @cmnd: CDB to send | |
1065 | * @cmnd_size: size in bytes of @cmnd | |
1066 | * @timeout: timeout for this request | |
1067 | * @sense_bytes: size of sense data to copy or 0 | |
1068 | * | |
1069 | * This function is used to send a scsi command down to a target device | |
1070 | * as part of the error recovery process. See also scsi_eh_prep_cmnd() above. | |
1071 | * | |
1072 | * Return value: | |
1073 | * SUCCESS or FAILED or NEEDS_RETRY | |
dc8875e1 | 1074 | */ |
b8e162f9 BVA |
1075 | static enum scsi_disposition scsi_send_eh_cmnd(struct scsi_cmnd *scmd, |
1076 | unsigned char *cmnd, int cmnd_size, int timeout, unsigned sense_bytes) | |
e1c23468 BH |
1077 | { |
1078 | struct scsi_device *sdev = scmd->device; | |
1079 | struct Scsi_Host *shost = sdev->host; | |
1080 | DECLARE_COMPLETION_ONSTACK(done); | |
bbe9fb0d | 1081 | unsigned long timeleft = timeout, delay; |
e1c23468 | 1082 | struct scsi_eh_save ses; |
fc73648a | 1083 | const unsigned long stall_for = msecs_to_jiffies(100); |
e1c23468 BH |
1084 | int rtn; |
1085 | ||
fc73648a | 1086 | retry: |
e1c23468 | 1087 | scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes); |
7dfdc9a5 | 1088 | shost->eh_action = &done; |
1da177e4 | 1089 | |
1da177e4 | 1090 | scsi_log_send(scmd); |
f281233d | 1091 | scmd->scsi_done = scsi_eh_done; |
bbe9fb0d BVA |
1092 | |
1093 | /* | |
1094 | * Lock sdev->state_mutex to avoid that scsi_device_quiesce() can | |
1095 | * change the SCSI device state after we have examined it and before | |
1096 | * .queuecommand() is called. | |
1097 | */ | |
1098 | mutex_lock(&sdev->state_mutex); | |
1099 | while (sdev->sdev_state == SDEV_BLOCK && timeleft > 0) { | |
1100 | mutex_unlock(&sdev->state_mutex); | |
1101 | SCSI_LOG_ERROR_RECOVERY(5, sdev_printk(KERN_DEBUG, sdev, | |
1102 | "%s: state %d <> %d\n", __func__, sdev->sdev_state, | |
1103 | SDEV_BLOCK)); | |
1104 | delay = min(timeleft, stall_for); | |
1105 | timeleft -= delay; | |
1106 | msleep(jiffies_to_msecs(delay)); | |
1107 | mutex_lock(&sdev->state_mutex); | |
1108 | } | |
1109 | if (sdev->sdev_state != SDEV_BLOCK) | |
1110 | rtn = shost->hostt->queuecommand(shost, scmd); | |
1111 | else | |
280e91b0 | 1112 | rtn = FAILED; |
bbe9fb0d BVA |
1113 | mutex_unlock(&sdev->state_mutex); |
1114 | ||
fc73648a HR |
1115 | if (rtn) { |
1116 | if (timeleft > stall_for) { | |
1117 | scsi_eh_restore_cmnd(scmd, &ses); | |
1118 | timeleft -= stall_for; | |
1119 | msleep(jiffies_to_msecs(stall_for)); | |
1120 | goto retry; | |
1121 | } | |
1122 | /* signal not to enter either branch of the if () below */ | |
1123 | timeleft = 0; | |
511833ac | 1124 | rtn = FAILED; |
fc73648a HR |
1125 | } else { |
1126 | timeleft = wait_for_completion_timeout(&done, timeout); | |
ac61d195 | 1127 | rtn = SUCCESS; |
fc73648a | 1128 | } |
1da177e4 | 1129 | |
f59114b7 | 1130 | shost->eh_action = NULL; |
1da177e4 | 1131 | |
fc73648a | 1132 | scsi_log_completion(scmd, rtn); |
1da177e4 | 1133 | |
91921e01 | 1134 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
470613b4 HR |
1135 | "%s timeleft: %ld\n", |
1136 | __func__, timeleft)); | |
1da177e4 LT |
1137 | |
1138 | /* | |
fc73648a HR |
1139 | * If there is time left scsi_eh_done got called, and we will examine |
1140 | * the actual status codes to see whether the command actually did | |
1141 | * complete normally, else if we have a zero return and no time left, | |
1142 | * the command must still be pending, so abort it and return FAILED. | |
1143 | * If we never actually managed to issue the command, because | |
1144 | * ->queuecommand() kept returning non zero, use the rtn = FAILED | |
1145 | * value above (so don't execute either branch of the if) | |
1da177e4 | 1146 | */ |
7dfdc9a5 | 1147 | if (timeleft) { |
1da177e4 | 1148 | rtn = scsi_eh_completed_normally(scmd); |
91921e01 HR |
1149 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
1150 | "%s: scsi_eh_completed_normally %x\n", __func__, rtn)); | |
7dfdc9a5 | 1151 | |
1da177e4 LT |
1152 | switch (rtn) { |
1153 | case SUCCESS: | |
1154 | case NEEDS_RETRY: | |
1155 | case FAILED: | |
1156 | break; | |
6e883b0e HR |
1157 | case ADD_TO_MLQUEUE: |
1158 | rtn = NEEDS_RETRY; | |
1159 | break; | |
1da177e4 LT |
1160 | default: |
1161 | rtn = FAILED; | |
1162 | break; | |
1163 | } | |
511833ac | 1164 | } else if (rtn != FAILED) { |
292148f8 | 1165 | scsi_abort_eh_cmnd(scmd); |
7dfdc9a5 | 1166 | rtn = FAILED; |
1da177e4 LT |
1167 | } |
1168 | ||
e1c23468 | 1169 | scsi_eh_restore_cmnd(scmd, &ses); |
18a4d0a2 | 1170 | |
1da177e4 LT |
1171 | return rtn; |
1172 | } | |
1173 | ||
1174 | /** | |
1175 | * scsi_request_sense - Request sense data from a particular target. | |
1176 | * @scmd: SCSI cmd for request sense. | |
1177 | * | |
1178 | * Notes: | |
1179 | * Some hosts automatically obtain this information, others require | |
1180 | * that we obtain it on our own. This function will *not* return until | |
1181 | * the command either times out, or it completes. | |
dc8875e1 | 1182 | */ |
b8e162f9 | 1183 | static enum scsi_disposition scsi_request_sense(struct scsi_cmnd *scmd) |
1da177e4 | 1184 | { |
0816c925 | 1185 | return scsi_send_eh_cmnd(scmd, NULL, 0, scmd->device->eh_timeout, ~0); |
1da177e4 LT |
1186 | } |
1187 | ||
b8e162f9 BVA |
1188 | static enum scsi_disposition |
1189 | scsi_eh_action(struct scsi_cmnd *scmd, enum scsi_disposition rtn) | |
2451079b | 1190 | { |
57292b58 | 1191 | if (!blk_rq_is_passthrough(scmd->request)) { |
2451079b JB |
1192 | struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd); |
1193 | if (sdrv->eh_action) | |
1194 | rtn = sdrv->eh_action(scmd, rtn); | |
1195 | } | |
1196 | return rtn; | |
1197 | } | |
1198 | ||
1da177e4 LT |
1199 | /** |
1200 | * scsi_eh_finish_cmd - Handle a cmd that eh is finished with. | |
1201 | * @scmd: Original SCSI cmd that eh has finished. | |
1202 | * @done_q: Queue for processed commands. | |
1203 | * | |
1204 | * Notes: | |
1205 | * We don't want to use the normal command completion while we are are | |
1206 | * still handling errors - it may cause other commands to be queued, | |
eb44820c | 1207 | * and that would disturb what we are doing. Thus we really want to |
1da177e4 LT |
1208 | * keep a list of pending commands for final completion, and once we |
1209 | * are ready to leave error handling we handle completion for real. | |
dc8875e1 | 1210 | */ |
041c5fc3 | 1211 | void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q) |
1da177e4 | 1212 | { |
1da177e4 LT |
1213 | list_move_tail(&scmd->eh_entry, done_q); |
1214 | } | |
041c5fc3 | 1215 | EXPORT_SYMBOL(scsi_eh_finish_cmd); |
1da177e4 LT |
1216 | |
1217 | /** | |
1218 | * scsi_eh_get_sense - Get device sense data. | |
1219 | * @work_q: Queue of commands to process. | |
eb44820c | 1220 | * @done_q: Queue of processed commands. |
1da177e4 LT |
1221 | * |
1222 | * Description: | |
1223 | * See if we need to request sense information. if so, then get it | |
0bf8c869 | 1224 | * now, so we have a better idea of what to do. |
1da177e4 LT |
1225 | * |
1226 | * Notes: | |
1227 | * This has the unfortunate side effect that if a shost adapter does | |
eb44820c | 1228 | * not automatically request sense information, we end up shutting |
1da177e4 LT |
1229 | * it down before we request it. |
1230 | * | |
1231 | * All drivers should request sense information internally these days, | |
1232 | * so for now all I have to say is tough noogies if you end up in here. | |
1233 | * | |
1234 | * XXX: Long term this code should go away, but that needs an audit of | |
1235 | * all LLDDs first. | |
dc8875e1 | 1236 | */ |
dca84e46 DW |
1237 | int scsi_eh_get_sense(struct list_head *work_q, |
1238 | struct list_head *done_q) | |
1da177e4 | 1239 | { |
937abeaa | 1240 | struct scsi_cmnd *scmd, *next; |
b4562022 | 1241 | struct Scsi_Host *shost; |
b8e162f9 | 1242 | enum scsi_disposition rtn; |
1da177e4 | 1243 | |
709c75b5 | 1244 | /* |
1245 | * If SCSI_EH_ABORT_SCHEDULED has been set, it is timeout IO, | |
1246 | * should not get sense. | |
1247 | */ | |
937abeaa | 1248 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
a0658632 | 1249 | if ((scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) || |
1da177e4 LT |
1250 | SCSI_SENSE_VALID(scmd)) |
1251 | continue; | |
1252 | ||
b4562022 | 1253 | shost = scmd->device->host; |
b4562022 | 1254 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 | 1255 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1256 | scmd_printk(KERN_INFO, scmd, |
1257 | "%s: skip request sense, past eh deadline\n", | |
1258 | current->comm)); | |
b4562022 HR |
1259 | break; |
1260 | } | |
d0672a03 | 1261 | if (!scsi_status_is_check_condition(scmd->result)) |
d555a2ab JB |
1262 | /* |
1263 | * don't request sense if there's no check condition | |
1264 | * status because the error we're processing isn't one | |
1265 | * that has a sense code (and some devices get | |
1266 | * confused by sense requests out of the blue) | |
1267 | */ | |
1268 | continue; | |
1269 | ||
3bf743e7 JG |
1270 | SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd, |
1271 | "%s: requesting sense\n", | |
1272 | current->comm)); | |
1da177e4 LT |
1273 | rtn = scsi_request_sense(scmd); |
1274 | if (rtn != SUCCESS) | |
1275 | continue; | |
1276 | ||
91921e01 | 1277 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
470613b4 | 1278 | "sense requested, result %x\n", scmd->result)); |
d811b848 | 1279 | SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense(scmd)); |
1da177e4 LT |
1280 | |
1281 | rtn = scsi_decide_disposition(scmd); | |
1282 | ||
1283 | /* | |
1284 | * if the result was normal, then just pass it along to the | |
1285 | * upper level. | |
1286 | */ | |
1287 | if (rtn == SUCCESS) | |
2a242d59 MC |
1288 | /* |
1289 | * We don't want this command reissued, just finished | |
1290 | * with the sense data, so set retries to the max | |
1291 | * allowed to ensure it won't get reissued. If the user | |
1292 | * has requested infinite retries, we also want to | |
1293 | * finish this command, so force completion by setting | |
1294 | * retries and allowed to the same value. | |
1295 | */ | |
1296 | if (scmd->allowed == SCSI_CMD_RETRIES_NO_LIMIT) | |
1297 | scmd->retries = scmd->allowed = 1; | |
1298 | else | |
1299 | scmd->retries = scmd->allowed; | |
1da177e4 LT |
1300 | else if (rtn != NEEDS_RETRY) |
1301 | continue; | |
1302 | ||
1303 | scsi_eh_finish_cmd(scmd, done_q); | |
1304 | } | |
1305 | ||
1306 | return list_empty(work_q); | |
1307 | } | |
dca84e46 | 1308 | EXPORT_SYMBOL_GPL(scsi_eh_get_sense); |
1da177e4 | 1309 | |
1da177e4 LT |
1310 | /** |
1311 | * scsi_eh_tur - Send TUR to device. | |
eb44820c | 1312 | * @scmd: &scsi_cmnd to send TUR |
1da177e4 LT |
1313 | * |
1314 | * Return value: | |
1315 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1316 | */ |
1da177e4 LT |
1317 | static int scsi_eh_tur(struct scsi_cmnd *scmd) |
1318 | { | |
1319 | static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0}; | |
b8e162f9 BVA |
1320 | int retry_cnt = 1; |
1321 | enum scsi_disposition rtn; | |
1da177e4 LT |
1322 | |
1323 | retry_tur: | |
0816c925 MP |
1324 | rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, |
1325 | scmd->device->eh_timeout, 0); | |
1da177e4 | 1326 | |
91921e01 | 1327 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
470613b4 | 1328 | "%s return: %x\n", __func__, rtn)); |
631c228c CH |
1329 | |
1330 | switch (rtn) { | |
1331 | case NEEDS_RETRY: | |
1da177e4 LT |
1332 | if (retry_cnt--) |
1333 | goto retry_tur; | |
df561f66 | 1334 | fallthrough; |
631c228c | 1335 | case SUCCESS: |
e47373ec | 1336 | return 0; |
631c228c CH |
1337 | default: |
1338 | return 1; | |
e47373ec | 1339 | } |
1da177e4 LT |
1340 | } |
1341 | ||
3eef6257 DJ |
1342 | /** |
1343 | * scsi_eh_test_devices - check if devices are responding from error recovery. | |
1344 | * @cmd_list: scsi commands in error recovery. | |
74cf298f RD |
1345 | * @work_q: queue for commands which still need more error recovery |
1346 | * @done_q: queue for commands which are finished | |
1347 | * @try_stu: boolean on if a STU command should be tried in addition to TUR. | |
3eef6257 DJ |
1348 | * |
1349 | * Decription: | |
1350 | * Tests if devices are in a working state. Commands to devices now in | |
1351 | * a working state are sent to the done_q while commands to devices which | |
1352 | * are still failing to respond are returned to the work_q for more | |
1353 | * processing. | |
1354 | **/ | |
1355 | static int scsi_eh_test_devices(struct list_head *cmd_list, | |
1356 | struct list_head *work_q, | |
1357 | struct list_head *done_q, int try_stu) | |
1358 | { | |
1359 | struct scsi_cmnd *scmd, *next; | |
1360 | struct scsi_device *sdev; | |
1361 | int finish_cmds; | |
1362 | ||
1363 | while (!list_empty(cmd_list)) { | |
1364 | scmd = list_entry(cmd_list->next, struct scsi_cmnd, eh_entry); | |
1365 | sdev = scmd->device; | |
1366 | ||
b4562022 | 1367 | if (!try_stu) { |
b4562022 HR |
1368 | if (scsi_host_eh_past_deadline(sdev->host)) { |
1369 | /* Push items back onto work_q */ | |
1370 | list_splice_init(cmd_list, work_q); | |
b4562022 | 1371 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1372 | sdev_printk(KERN_INFO, sdev, |
1373 | "%s: skip test device, past eh deadline", | |
1374 | current->comm)); | |
b4562022 HR |
1375 | break; |
1376 | } | |
b4562022 HR |
1377 | } |
1378 | ||
3eef6257 DJ |
1379 | finish_cmds = !scsi_device_online(scmd->device) || |
1380 | (try_stu && !scsi_eh_try_stu(scmd) && | |
1381 | !scsi_eh_tur(scmd)) || | |
1382 | !scsi_eh_tur(scmd); | |
1383 | ||
1384 | list_for_each_entry_safe(scmd, next, cmd_list, eh_entry) | |
1385 | if (scmd->device == sdev) { | |
2451079b JB |
1386 | if (finish_cmds && |
1387 | (try_stu || | |
1388 | scsi_eh_action(scmd, SUCCESS) == SUCCESS)) | |
3eef6257 DJ |
1389 | scsi_eh_finish_cmd(scmd, done_q); |
1390 | else | |
1391 | list_move_tail(&scmd->eh_entry, work_q); | |
1392 | } | |
1393 | } | |
1394 | return list_empty(work_q); | |
1395 | } | |
1396 | ||
1da177e4 LT |
1397 | /** |
1398 | * scsi_eh_try_stu - Send START_UNIT to device. | |
eb44820c | 1399 | * @scmd: &scsi_cmnd to send START_UNIT |
1da177e4 LT |
1400 | * |
1401 | * Return value: | |
1402 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1403 | */ |
1da177e4 LT |
1404 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd) |
1405 | { | |
1406 | static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0}; | |
1da177e4 | 1407 | |
631c228c | 1408 | if (scmd->device->allow_restart) { |
b8e162f9 BVA |
1409 | int i; |
1410 | enum scsi_disposition rtn = NEEDS_RETRY; | |
ed773e66 BK |
1411 | |
1412 | for (i = 0; rtn == NEEDS_RETRY && i < 2; i++) | |
9728c081 | 1413 | rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0); |
1da177e4 | 1414 | |
631c228c CH |
1415 | if (rtn == SUCCESS) |
1416 | return 0; | |
1417 | } | |
1da177e4 | 1418 | |
1da177e4 LT |
1419 | return 1; |
1420 | } | |
1421 | ||
1422 | /** | |
1423 | * scsi_eh_stu - send START_UNIT if needed | |
eb44820c | 1424 | * @shost: &scsi host being recovered. |
74cf298f | 1425 | * @work_q: &list_head for pending commands. |
eb44820c | 1426 | * @done_q: &list_head for processed commands. |
1da177e4 LT |
1427 | * |
1428 | * Notes: | |
1429 | * If commands are failing due to not ready, initializing command required, | |
0bf8c869 | 1430 | * try revalidating the device, which will end up sending a start unit. |
dc8875e1 | 1431 | */ |
1da177e4 LT |
1432 | static int scsi_eh_stu(struct Scsi_Host *shost, |
1433 | struct list_head *work_q, | |
1434 | struct list_head *done_q) | |
1435 | { | |
937abeaa | 1436 | struct scsi_cmnd *scmd, *stu_scmd, *next; |
1da177e4 LT |
1437 | struct scsi_device *sdev; |
1438 | ||
1439 | shost_for_each_device(sdev, shost) { | |
b4562022 | 1440 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 | 1441 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1442 | sdev_printk(KERN_INFO, sdev, |
1443 | "%s: skip START_UNIT, past eh deadline\n", | |
1444 | current->comm)); | |
4dea170f | 1445 | scsi_device_put(sdev); |
b4562022 HR |
1446 | break; |
1447 | } | |
1da177e4 LT |
1448 | stu_scmd = NULL; |
1449 | list_for_each_entry(scmd, work_q, eh_entry) | |
1450 | if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) && | |
1451 | scsi_check_sense(scmd) == FAILED ) { | |
1452 | stu_scmd = scmd; | |
1453 | break; | |
1454 | } | |
1455 | ||
1456 | if (!stu_scmd) | |
1457 | continue; | |
1458 | ||
91921e01 | 1459 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1460 | sdev_printk(KERN_INFO, sdev, |
1461 | "%s: Sending START_UNIT\n", | |
1462 | current->comm)); | |
1da177e4 LT |
1463 | |
1464 | if (!scsi_eh_try_stu(stu_scmd)) { | |
1465 | if (!scsi_device_online(sdev) || | |
1466 | !scsi_eh_tur(stu_scmd)) { | |
937abeaa CH |
1467 | list_for_each_entry_safe(scmd, next, |
1468 | work_q, eh_entry) { | |
2451079b JB |
1469 | if (scmd->device == sdev && |
1470 | scsi_eh_action(scmd, SUCCESS) == SUCCESS) | |
1da177e4 LT |
1471 | scsi_eh_finish_cmd(scmd, done_q); |
1472 | } | |
1473 | } | |
1474 | } else { | |
1475 | SCSI_LOG_ERROR_RECOVERY(3, | |
a222b1e2 HR |
1476 | sdev_printk(KERN_INFO, sdev, |
1477 | "%s: START_UNIT failed\n", | |
1478 | current->comm)); | |
1da177e4 LT |
1479 | } |
1480 | } | |
1481 | ||
1482 | return list_empty(work_q); | |
1483 | } | |
1484 | ||
1485 | ||
1486 | /** | |
1487 | * scsi_eh_bus_device_reset - send bdr if needed | |
1488 | * @shost: scsi host being recovered. | |
74cf298f | 1489 | * @work_q: &list_head for pending commands. |
eb44820c | 1490 | * @done_q: &list_head for processed commands. |
1da177e4 LT |
1491 | * |
1492 | * Notes: | |
eb44820c | 1493 | * Try a bus device reset. Still, look to see whether we have multiple |
1da177e4 LT |
1494 | * devices that are jammed or not - if we have multiple devices, it |
1495 | * makes no sense to try bus_device_reset - we really would need to try | |
0bf8c869 | 1496 | * a bus_reset instead. |
dc8875e1 | 1497 | */ |
1da177e4 LT |
1498 | static int scsi_eh_bus_device_reset(struct Scsi_Host *shost, |
1499 | struct list_head *work_q, | |
1500 | struct list_head *done_q) | |
1501 | { | |
937abeaa | 1502 | struct scsi_cmnd *scmd, *bdr_scmd, *next; |
1da177e4 | 1503 | struct scsi_device *sdev; |
b8e162f9 | 1504 | enum scsi_disposition rtn; |
1da177e4 LT |
1505 | |
1506 | shost_for_each_device(sdev, shost) { | |
b4562022 | 1507 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 | 1508 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1509 | sdev_printk(KERN_INFO, sdev, |
1510 | "%s: skip BDR, past eh deadline\n", | |
1511 | current->comm)); | |
4dea170f | 1512 | scsi_device_put(sdev); |
b4562022 HR |
1513 | break; |
1514 | } | |
1da177e4 LT |
1515 | bdr_scmd = NULL; |
1516 | list_for_each_entry(scmd, work_q, eh_entry) | |
1517 | if (scmd->device == sdev) { | |
1518 | bdr_scmd = scmd; | |
1519 | break; | |
1520 | } | |
1521 | ||
1522 | if (!bdr_scmd) | |
1523 | continue; | |
1524 | ||
91921e01 | 1525 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1526 | sdev_printk(KERN_INFO, sdev, |
1527 | "%s: Sending BDR\n", current->comm)); | |
1da177e4 | 1528 | rtn = scsi_try_bus_device_reset(bdr_scmd); |
2f2eb587 | 1529 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
1da177e4 | 1530 | if (!scsi_device_online(sdev) || |
2f2eb587 | 1531 | rtn == FAST_IO_FAIL || |
1da177e4 | 1532 | !scsi_eh_tur(bdr_scmd)) { |
937abeaa CH |
1533 | list_for_each_entry_safe(scmd, next, |
1534 | work_q, eh_entry) { | |
2451079b JB |
1535 | if (scmd->device == sdev && |
1536 | scsi_eh_action(scmd, rtn) != FAILED) | |
1da177e4 LT |
1537 | scsi_eh_finish_cmd(scmd, |
1538 | done_q); | |
1539 | } | |
1540 | } | |
1541 | } else { | |
91921e01 | 1542 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1543 | sdev_printk(KERN_INFO, sdev, |
1544 | "%s: BDR failed\n", current->comm)); | |
1da177e4 LT |
1545 | } |
1546 | } | |
1547 | ||
1548 | return list_empty(work_q); | |
1549 | } | |
1550 | ||
30bd7df8 MC |
1551 | /** |
1552 | * scsi_eh_target_reset - send target reset if needed | |
1553 | * @shost: scsi host being recovered. | |
74cf298f | 1554 | * @work_q: &list_head for pending commands. |
30bd7df8 MC |
1555 | * @done_q: &list_head for processed commands. |
1556 | * | |
1557 | * Notes: | |
1558 | * Try a target reset. | |
1559 | */ | |
1560 | static int scsi_eh_target_reset(struct Scsi_Host *shost, | |
1561 | struct list_head *work_q, | |
1562 | struct list_head *done_q) | |
1563 | { | |
98db5195 | 1564 | LIST_HEAD(tmp_list); |
3eef6257 | 1565 | LIST_HEAD(check_list); |
30bd7df8 | 1566 | |
98db5195 JB |
1567 | list_splice_init(work_q, &tmp_list); |
1568 | ||
1569 | while (!list_empty(&tmp_list)) { | |
1570 | struct scsi_cmnd *next, *scmd; | |
b8e162f9 | 1571 | enum scsi_disposition rtn; |
98db5195 | 1572 | unsigned int id; |
b4562022 | 1573 | |
b4562022 | 1574 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 HR |
1575 | /* push back on work queue for further processing */ |
1576 | list_splice_init(&check_list, work_q); | |
1577 | list_splice_init(&tmp_list, work_q); | |
1578 | SCSI_LOG_ERROR_RECOVERY(3, | |
1579 | shost_printk(KERN_INFO, shost, | |
a222b1e2 HR |
1580 | "%s: Skip target reset, past eh deadline\n", |
1581 | current->comm)); | |
b4562022 HR |
1582 | return list_empty(work_q); |
1583 | } | |
98db5195 JB |
1584 | |
1585 | scmd = list_entry(tmp_list.next, struct scsi_cmnd, eh_entry); | |
1586 | id = scmd_id(scmd); | |
30bd7df8 | 1587 | |
91921e01 HR |
1588 | SCSI_LOG_ERROR_RECOVERY(3, |
1589 | shost_printk(KERN_INFO, shost, | |
1590 | "%s: Sending target reset to target %d\n", | |
1591 | current->comm, id)); | |
98db5195 JB |
1592 | rtn = scsi_try_target_reset(scmd); |
1593 | if (rtn != SUCCESS && rtn != FAST_IO_FAIL) | |
91921e01 HR |
1594 | SCSI_LOG_ERROR_RECOVERY(3, |
1595 | shost_printk(KERN_INFO, shost, | |
1596 | "%s: Target reset failed" | |
1597 | " target: %d\n", | |
1598 | current->comm, id)); | |
98db5195 JB |
1599 | list_for_each_entry_safe(scmd, next, &tmp_list, eh_entry) { |
1600 | if (scmd_id(scmd) != id) | |
1601 | continue; | |
1602 | ||
3eef6257 DJ |
1603 | if (rtn == SUCCESS) |
1604 | list_move_tail(&scmd->eh_entry, &check_list); | |
1605 | else if (rtn == FAST_IO_FAIL) | |
98db5195 JB |
1606 | scsi_eh_finish_cmd(scmd, done_q); |
1607 | else | |
1608 | /* push back on work queue for further processing */ | |
1609 | list_move(&scmd->eh_entry, work_q); | |
1610 | } | |
1611 | } | |
30bd7df8 | 1612 | |
3eef6257 | 1613 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
30bd7df8 MC |
1614 | } |
1615 | ||
1da177e4 | 1616 | /** |
0bf8c869 | 1617 | * scsi_eh_bus_reset - send a bus reset |
eb44820c | 1618 | * @shost: &scsi host being recovered. |
74cf298f | 1619 | * @work_q: &list_head for pending commands. |
eb44820c | 1620 | * @done_q: &list_head for processed commands. |
dc8875e1 | 1621 | */ |
1da177e4 LT |
1622 | static int scsi_eh_bus_reset(struct Scsi_Host *shost, |
1623 | struct list_head *work_q, | |
1624 | struct list_head *done_q) | |
1625 | { | |
937abeaa | 1626 | struct scsi_cmnd *scmd, *chan_scmd, *next; |
3eef6257 | 1627 | LIST_HEAD(check_list); |
1da177e4 | 1628 | unsigned int channel; |
b8e162f9 | 1629 | enum scsi_disposition rtn; |
1da177e4 LT |
1630 | |
1631 | /* | |
1632 | * we really want to loop over the various channels, and do this on | |
1633 | * a channel by channel basis. we should also check to see if any | |
1634 | * of the failed commands are on soft_reset devices, and if so, skip | |
0bf8c869 | 1635 | * the reset. |
1da177e4 LT |
1636 | */ |
1637 | ||
1638 | for (channel = 0; channel <= shost->max_channel; channel++) { | |
b4562022 | 1639 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 HR |
1640 | list_splice_init(&check_list, work_q); |
1641 | SCSI_LOG_ERROR_RECOVERY(3, | |
1642 | shost_printk(KERN_INFO, shost, | |
a222b1e2 HR |
1643 | "%s: skip BRST, past eh deadline\n", |
1644 | current->comm)); | |
b4562022 HR |
1645 | return list_empty(work_q); |
1646 | } | |
b4562022 | 1647 | |
1da177e4 LT |
1648 | chan_scmd = NULL; |
1649 | list_for_each_entry(scmd, work_q, eh_entry) { | |
422c0d61 | 1650 | if (channel == scmd_channel(scmd)) { |
1da177e4 LT |
1651 | chan_scmd = scmd; |
1652 | break; | |
1653 | /* | |
1654 | * FIXME add back in some support for | |
1655 | * soft_reset devices. | |
1656 | */ | |
1657 | } | |
1658 | } | |
1659 | ||
1660 | if (!chan_scmd) | |
1661 | continue; | |
91921e01 HR |
1662 | SCSI_LOG_ERROR_RECOVERY(3, |
1663 | shost_printk(KERN_INFO, shost, | |
1664 | "%s: Sending BRST chan: %d\n", | |
1665 | current->comm, channel)); | |
1da177e4 | 1666 | rtn = scsi_try_bus_reset(chan_scmd); |
2f2eb587 | 1667 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
937abeaa | 1668 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3eef6257 DJ |
1669 | if (channel == scmd_channel(scmd)) { |
1670 | if (rtn == FAST_IO_FAIL) | |
1da177e4 LT |
1671 | scsi_eh_finish_cmd(scmd, |
1672 | done_q); | |
3eef6257 DJ |
1673 | else |
1674 | list_move_tail(&scmd->eh_entry, | |
1675 | &check_list); | |
1676 | } | |
1da177e4 LT |
1677 | } |
1678 | } else { | |
91921e01 HR |
1679 | SCSI_LOG_ERROR_RECOVERY(3, |
1680 | shost_printk(KERN_INFO, shost, | |
1681 | "%s: BRST failed chan: %d\n", | |
1682 | current->comm, channel)); | |
1da177e4 LT |
1683 | } |
1684 | } | |
3eef6257 | 1685 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4 LT |
1686 | } |
1687 | ||
1688 | /** | |
0bf8c869 | 1689 | * scsi_eh_host_reset - send a host reset |
74cf298f RD |
1690 | * @shost: host to be reset. |
1691 | * @work_q: &list_head for pending commands. | |
1692 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1693 | */ |
91921e01 HR |
1694 | static int scsi_eh_host_reset(struct Scsi_Host *shost, |
1695 | struct list_head *work_q, | |
1da177e4 LT |
1696 | struct list_head *done_q) |
1697 | { | |
937abeaa | 1698 | struct scsi_cmnd *scmd, *next; |
3eef6257 | 1699 | LIST_HEAD(check_list); |
b8e162f9 | 1700 | enum scsi_disposition rtn; |
1da177e4 LT |
1701 | |
1702 | if (!list_empty(work_q)) { | |
1703 | scmd = list_entry(work_q->next, | |
1704 | struct scsi_cmnd, eh_entry); | |
1705 | ||
91921e01 HR |
1706 | SCSI_LOG_ERROR_RECOVERY(3, |
1707 | shost_printk(KERN_INFO, shost, | |
1708 | "%s: Sending HRST\n", | |
1709 | current->comm)); | |
1da177e4 LT |
1710 | |
1711 | rtn = scsi_try_host_reset(scmd); | |
3eef6257 DJ |
1712 | if (rtn == SUCCESS) { |
1713 | list_splice_init(work_q, &check_list); | |
1714 | } else if (rtn == FAST_IO_FAIL) { | |
937abeaa | 1715 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1da177e4 LT |
1716 | scsi_eh_finish_cmd(scmd, done_q); |
1717 | } | |
1718 | } else { | |
91921e01 HR |
1719 | SCSI_LOG_ERROR_RECOVERY(3, |
1720 | shost_printk(KERN_INFO, shost, | |
1721 | "%s: HRST failed\n", | |
1722 | current->comm)); | |
1da177e4 LT |
1723 | } |
1724 | } | |
3eef6257 | 1725 | return scsi_eh_test_devices(&check_list, work_q, done_q, 1); |
1da177e4 LT |
1726 | } |
1727 | ||
1728 | /** | |
1729 | * scsi_eh_offline_sdevs - offline scsi devices that fail to recover | |
74cf298f RD |
1730 | * @work_q: &list_head for pending commands. |
1731 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1732 | */ |
1da177e4 LT |
1733 | static void scsi_eh_offline_sdevs(struct list_head *work_q, |
1734 | struct list_head *done_q) | |
1735 | { | |
937abeaa | 1736 | struct scsi_cmnd *scmd, *next; |
0db6ca8a | 1737 | struct scsi_device *sdev; |
1da177e4 | 1738 | |
937abeaa | 1739 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
31765d7d MW |
1740 | sdev_printk(KERN_INFO, scmd->device, "Device offlined - " |
1741 | "not ready after error recovery\n"); | |
0db6ca8a BVA |
1742 | sdev = scmd->device; |
1743 | ||
1744 | mutex_lock(&sdev->state_mutex); | |
1745 | scsi_device_set_state(sdev, SDEV_OFFLINE); | |
1746 | mutex_unlock(&sdev->state_mutex); | |
1747 | ||
1da177e4 LT |
1748 | scsi_eh_finish_cmd(scmd, done_q); |
1749 | } | |
1750 | return; | |
1751 | } | |
1752 | ||
4a27446f | 1753 | /** |
e494f6a7 | 1754 | * scsi_noretry_cmd - determine if command should be failed fast |
4a27446f MC |
1755 | * @scmd: SCSI cmd to examine. |
1756 | */ | |
1757 | int scsi_noretry_cmd(struct scsi_cmnd *scmd) | |
1758 | { | |
1759 | switch (host_byte(scmd->result)) { | |
1760 | case DID_OK: | |
1761 | break; | |
e494f6a7 HR |
1762 | case DID_TIME_OUT: |
1763 | goto check_type; | |
4a27446f | 1764 | case DID_BUS_BUSY: |
33659ebb | 1765 | return (scmd->request->cmd_flags & REQ_FAILFAST_TRANSPORT); |
4a27446f | 1766 | case DID_PARITY: |
33659ebb | 1767 | return (scmd->request->cmd_flags & REQ_FAILFAST_DEV); |
4a27446f MC |
1768 | case DID_ERROR: |
1769 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1770 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1771 | return 0; | |
df561f66 | 1772 | fallthrough; |
4a27446f | 1773 | case DID_SOFT_ERROR: |
33659ebb | 1774 | return (scmd->request->cmd_flags & REQ_FAILFAST_DRIVER); |
4a27446f MC |
1775 | } |
1776 | ||
d0672a03 | 1777 | if (!scsi_status_is_check_condition(scmd->result)) |
e494f6a7 | 1778 | return 0; |
4a27446f | 1779 | |
e494f6a7 HR |
1780 | check_type: |
1781 | /* | |
1782 | * assume caller has checked sense and determined | |
1783 | * the check condition was retryable. | |
1784 | */ | |
1785 | if (scmd->request->cmd_flags & REQ_FAILFAST_DEV || | |
57292b58 | 1786 | blk_rq_is_passthrough(scmd->request)) |
e494f6a7 | 1787 | return 1; |
342c81ee DLM |
1788 | |
1789 | return 0; | |
4a27446f MC |
1790 | } |
1791 | ||
1da177e4 LT |
1792 | /** |
1793 | * scsi_decide_disposition - Disposition a cmd on return from LLD. | |
1794 | * @scmd: SCSI cmd to examine. | |
1795 | * | |
1796 | * Notes: | |
1797 | * This is *only* called when we are examining the status after sending | |
1798 | * out the actual data command. any commands that are queued for error | |
1799 | * recovery (e.g. test_unit_ready) do *not* come through here. | |
1800 | * | |
1801 | * When this routine returns failed, it means the error handler thread | |
1802 | * is woken. In cases where the error code indicates an error that | |
1803 | * doesn't require the error handler read (i.e. we don't need to | |
1804 | * abort/reset), this function should return SUCCESS. | |
dc8875e1 | 1805 | */ |
b8e162f9 | 1806 | enum scsi_disposition scsi_decide_disposition(struct scsi_cmnd *scmd) |
1da177e4 | 1807 | { |
b8e162f9 | 1808 | enum scsi_disposition rtn; |
1da177e4 LT |
1809 | |
1810 | /* | |
1811 | * if the device is offline, then we clearly just pass the result back | |
1812 | * up to the top level. | |
1813 | */ | |
1814 | if (!scsi_device_online(scmd->device)) { | |
91921e01 HR |
1815 | SCSI_LOG_ERROR_RECOVERY(5, scmd_printk(KERN_INFO, scmd, |
1816 | "%s: device offline - report as SUCCESS\n", __func__)); | |
1da177e4 LT |
1817 | return SUCCESS; |
1818 | } | |
1819 | ||
1820 | /* | |
1821 | * first check the host byte, to see if there is anything in there | |
1822 | * that would indicate what we need to do. | |
1823 | */ | |
1824 | switch (host_byte(scmd->result)) { | |
1825 | case DID_PASSTHROUGH: | |
1826 | /* | |
1827 | * no matter what, pass this through to the upper layer. | |
1828 | * nuke this special code so that it looks like we are saying | |
1829 | * did_ok. | |
1830 | */ | |
1831 | scmd->result &= 0xff00ffff; | |
1832 | return SUCCESS; | |
1833 | case DID_OK: | |
1834 | /* | |
1835 | * looks good. drop through, and check the next byte. | |
1836 | */ | |
1837 | break; | |
e494f6a7 HR |
1838 | case DID_ABORT: |
1839 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) { | |
8922a908 | 1840 | set_host_byte(scmd, DID_TIME_OUT); |
e494f6a7 HR |
1841 | return SUCCESS; |
1842 | } | |
df561f66 | 1843 | fallthrough; |
1da177e4 LT |
1844 | case DID_NO_CONNECT: |
1845 | case DID_BAD_TARGET: | |
1da177e4 LT |
1846 | /* |
1847 | * note - this means that we just report the status back | |
1848 | * to the top level driver, not that we actually think | |
1849 | * that it indicates SUCCESS. | |
1850 | */ | |
1851 | return SUCCESS; | |
ad95028a | 1852 | case DID_SOFT_ERROR: |
1da177e4 LT |
1853 | /* |
1854 | * when the low level driver returns did_soft_error, | |
0bf8c869 | 1855 | * it is responsible for keeping an internal retry counter |
1da177e4 | 1856 | * in order to avoid endless loops (db) |
1da177e4 | 1857 | */ |
1da177e4 LT |
1858 | goto maybe_retry; |
1859 | case DID_IMM_RETRY: | |
1860 | return NEEDS_RETRY; | |
1861 | ||
bf341919 | 1862 | case DID_REQUEUE: |
1863 | return ADD_TO_MLQUEUE; | |
a4dfaa6f MC |
1864 | case DID_TRANSPORT_DISRUPTED: |
1865 | /* | |
1866 | * LLD/transport was disrupted during processing of the IO. | |
1867 | * The transport class is now blocked/blocking, | |
1868 | * and the transport will decide what to do with the IO | |
939c2288 MC |
1869 | * based on its timers and recovery capablilities if |
1870 | * there are enough retries. | |
a4dfaa6f | 1871 | */ |
939c2288 | 1872 | goto maybe_retry; |
a4dfaa6f MC |
1873 | case DID_TRANSPORT_FAILFAST: |
1874 | /* | |
1875 | * The transport decided to failfast the IO (most likely | |
1876 | * the fast io fail tmo fired), so send IO directly upwards. | |
1877 | */ | |
1878 | return SUCCESS; | |
962c8dcd MK |
1879 | case DID_TRANSPORT_MARGINAL: |
1880 | /* | |
1881 | * caller has decided not to do retries on | |
1882 | * abort success, so send IO directly upwards | |
1883 | */ | |
1884 | return SUCCESS; | |
1da177e4 LT |
1885 | case DID_ERROR: |
1886 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1887 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1888 | /* | |
1889 | * execute reservation conflict processing code | |
1890 | * lower down | |
1891 | */ | |
1892 | break; | |
df561f66 | 1893 | fallthrough; |
1da177e4 LT |
1894 | case DID_BUS_BUSY: |
1895 | case DID_PARITY: | |
1896 | goto maybe_retry; | |
1897 | case DID_TIME_OUT: | |
1898 | /* | |
1899 | * when we scan the bus, we get timeout messages for | |
1900 | * these commands if there is no device available. | |
1901 | * other hosts report did_no_connect for the same thing. | |
1902 | */ | |
1903 | if ((scmd->cmnd[0] == TEST_UNIT_READY || | |
1904 | scmd->cmnd[0] == INQUIRY)) { | |
1905 | return SUCCESS; | |
1906 | } else { | |
1907 | return FAILED; | |
1908 | } | |
1909 | case DID_RESET: | |
1910 | return SUCCESS; | |
1911 | default: | |
1912 | return FAILED; | |
1913 | } | |
1914 | ||
1915 | /* | |
1916 | * next, check the message byte. | |
1917 | */ | |
1918 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
1919 | return FAILED; | |
1920 | ||
1921 | /* | |
1922 | * check the status byte to see if this indicates anything special. | |
1923 | */ | |
1924 | switch (status_byte(scmd->result)) { | |
1925 | case QUEUE_FULL: | |
42a6a918 | 1926 | scsi_handle_queue_full(scmd->device); |
1da177e4 LT |
1927 | /* |
1928 | * the case of trying to send too many commands to a | |
1929 | * tagged queueing device. | |
1930 | */ | |
df561f66 | 1931 | fallthrough; |
1da177e4 LT |
1932 | case BUSY: |
1933 | /* | |
1934 | * device can't talk to us at the moment. Should only | |
1935 | * occur (SAM-3) when the task queue is empty, so will cause | |
1936 | * the empty queue handling to trigger a stall in the | |
1937 | * device. | |
1938 | */ | |
1939 | return ADD_TO_MLQUEUE; | |
1940 | case GOOD: | |
279afdfe EM |
1941 | if (scmd->cmnd[0] == REPORT_LUNS) |
1942 | scmd->device->sdev_target->expecting_lun_change = 0; | |
4a84067d | 1943 | scsi_handle_queue_ramp_up(scmd->device); |
df561f66 | 1944 | fallthrough; |
1da177e4 | 1945 | case COMMAND_TERMINATED: |
1da177e4 | 1946 | return SUCCESS; |
a9b589d9 VB |
1947 | case TASK_ABORTED: |
1948 | goto maybe_retry; | |
1da177e4 LT |
1949 | case CHECK_CONDITION: |
1950 | rtn = scsi_check_sense(scmd); | |
1951 | if (rtn == NEEDS_RETRY) | |
1952 | goto maybe_retry; | |
1953 | /* if rtn == FAILED, we have no sense information; | |
1954 | * returning FAILED will wake the error handler thread | |
1955 | * to collect the sense and redo the decide | |
1956 | * disposition */ | |
1957 | return rtn; | |
1958 | case CONDITION_GOOD: | |
1959 | case INTERMEDIATE_GOOD: | |
1960 | case INTERMEDIATE_C_GOOD: | |
1961 | case ACA_ACTIVE: | |
1962 | /* | |
1963 | * who knows? FIXME(eric) | |
1964 | */ | |
1965 | return SUCCESS; | |
1966 | ||
1967 | case RESERVATION_CONFLICT: | |
9ccfc756 JB |
1968 | sdev_printk(KERN_INFO, scmd->device, |
1969 | "reservation conflict\n"); | |
2082ebc4 | 1970 | set_host_byte(scmd, DID_NEXUS_FAILURE); |
1da177e4 LT |
1971 | return SUCCESS; /* causes immediate i/o error */ |
1972 | default: | |
1973 | return FAILED; | |
1974 | } | |
1975 | return FAILED; | |
1976 | ||
8ef7fe4b | 1977 | maybe_retry: |
1da177e4 LT |
1978 | |
1979 | /* we requeue for retry because the error was retryable, and | |
1980 | * the request was not marked fast fail. Note that above, | |
1981 | * even if the request is marked fast fail, we still requeue | |
1982 | * for queue congestion conditions (QUEUE_FULL or BUSY) */ | |
2a242d59 | 1983 | if (scsi_cmd_retry_allowed(scmd) && !scsi_noretry_cmd(scmd)) { |
1da177e4 LT |
1984 | return NEEDS_RETRY; |
1985 | } else { | |
1986 | /* | |
1987 | * no more retries - report this one back to upper level. | |
1988 | */ | |
1989 | return SUCCESS; | |
1990 | } | |
1991 | } | |
1992 | ||
2a842aca | 1993 | static void eh_lock_door_done(struct request *req, blk_status_t status) |
f078727b | 1994 | { |
92bc5a24 | 1995 | blk_put_request(req); |
f078727b FT |
1996 | } |
1997 | ||
1da177e4 LT |
1998 | /** |
1999 | * scsi_eh_lock_door - Prevent medium removal for the specified device | |
2000 | * @sdev: SCSI device to prevent medium removal | |
2001 | * | |
2002 | * Locking: | |
91bc31fb | 2003 | * We must be called from process context. |
1da177e4 LT |
2004 | * |
2005 | * Notes: | |
2006 | * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the | |
2007 | * head of the devices request queue, and continue. | |
dc8875e1 | 2008 | */ |
1da177e4 LT |
2009 | static void scsi_eh_lock_door(struct scsi_device *sdev) |
2010 | { | |
f078727b | 2011 | struct request *req; |
82ed4db4 | 2012 | struct scsi_request *rq; |
1da177e4 | 2013 | |
ff005a06 | 2014 | req = blk_get_request(sdev->request_queue, REQ_OP_SCSI_IN, 0); |
a492f075 | 2015 | if (IS_ERR(req)) |
eb571eea | 2016 | return; |
82ed4db4 | 2017 | rq = scsi_req(req); |
1da177e4 | 2018 | |
82ed4db4 CH |
2019 | rq->cmd[0] = ALLOW_MEDIUM_REMOVAL; |
2020 | rq->cmd[1] = 0; | |
2021 | rq->cmd[2] = 0; | |
2022 | rq->cmd[3] = 0; | |
2023 | rq->cmd[4] = SCSI_REMOVAL_PREVENT; | |
2024 | rq->cmd[5] = 0; | |
2025 | rq->cmd_len = COMMAND_SIZE(rq->cmd[0]); | |
f078727b | 2026 | |
e8064021 | 2027 | req->rq_flags |= RQF_QUIET; |
f078727b | 2028 | req->timeout = 10 * HZ; |
64c7f1d1 | 2029 | rq->retries = 5; |
f078727b | 2030 | |
8eeed0b5 | 2031 | blk_execute_rq_nowait(NULL, req, 1, eh_lock_door_done); |
f078727b | 2032 | } |
1da177e4 LT |
2033 | |
2034 | /** | |
2035 | * scsi_restart_operations - restart io operations to the specified host. | |
2036 | * @shost: Host we are restarting. | |
2037 | * | |
2038 | * Notes: | |
2039 | * When we entered the error handler, we blocked all further i/o to | |
2040 | * this device. we need to 'reverse' this process. | |
dc8875e1 | 2041 | */ |
1da177e4 LT |
2042 | static void scsi_restart_operations(struct Scsi_Host *shost) |
2043 | { | |
2044 | struct scsi_device *sdev; | |
939647ee | 2045 | unsigned long flags; |
1da177e4 LT |
2046 | |
2047 | /* | |
2048 | * If the door was locked, we need to insert a door lock request | |
2049 | * onto the head of the SCSI request queue for the device. There | |
2050 | * is no point trying to lock the door of an off-line device. | |
2051 | */ | |
2052 | shost_for_each_device(sdev, shost) { | |
48379270 | 2053 | if (scsi_device_online(sdev) && sdev->was_reset && sdev->locked) { |
1da177e4 | 2054 | scsi_eh_lock_door(sdev); |
48379270 CH |
2055 | sdev->was_reset = 0; |
2056 | } | |
1da177e4 LT |
2057 | } |
2058 | ||
2059 | /* | |
2060 | * next free up anything directly waiting upon the host. this | |
2061 | * will be requests for character device operations, and also for | |
2062 | * ioctls to queued block devices. | |
2063 | */ | |
b4562022 | 2064 | SCSI_LOG_ERROR_RECOVERY(3, |
91921e01 | 2065 | shost_printk(KERN_INFO, shost, "waking up host to restart\n")); |
1da177e4 | 2066 | |
939647ee JB |
2067 | spin_lock_irqsave(shost->host_lock, flags); |
2068 | if (scsi_host_set_state(shost, SHOST_RUNNING)) | |
2069 | if (scsi_host_set_state(shost, SHOST_CANCEL)) | |
2070 | BUG_ON(scsi_host_set_state(shost, SHOST_DEL)); | |
2071 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
2072 | |
2073 | wake_up(&shost->host_wait); | |
2074 | ||
2075 | /* | |
2076 | * finally we need to re-initiate requests that may be pending. we will | |
2077 | * have had everything blocked while error handling is taking place, and | |
2078 | * now that error recovery is done, we will need to ensure that these | |
2079 | * requests are started. | |
2080 | */ | |
2081 | scsi_run_host_queues(shost); | |
57fc2e33 DW |
2082 | |
2083 | /* | |
2084 | * if eh is active and host_eh_scheduled is pending we need to re-run | |
2085 | * recovery. we do this check after scsi_run_host_queues() to allow | |
2086 | * everything pent up since the last eh run a chance to make forward | |
2087 | * progress before we sync again. Either we'll immediately re-run | |
2088 | * recovery or scsi_device_unbusy() will wake us again when these | |
2089 | * pending commands complete. | |
2090 | */ | |
2091 | spin_lock_irqsave(shost->host_lock, flags); | |
2092 | if (shost->host_eh_scheduled) | |
2093 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) | |
2094 | WARN_ON(scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)); | |
2095 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
2096 | } |
2097 | ||
2098 | /** | |
2099 | * scsi_eh_ready_devs - check device ready state and recover if not. | |
74cf298f RD |
2100 | * @shost: host to be recovered. |
2101 | * @work_q: &list_head for pending commands. | |
eb44820c | 2102 | * @done_q: &list_head for processed commands. |
dc8875e1 | 2103 | */ |
dca84e46 DW |
2104 | void scsi_eh_ready_devs(struct Scsi_Host *shost, |
2105 | struct list_head *work_q, | |
2106 | struct list_head *done_q) | |
1da177e4 LT |
2107 | { |
2108 | if (!scsi_eh_stu(shost, work_q, done_q)) | |
2109 | if (!scsi_eh_bus_device_reset(shost, work_q, done_q)) | |
30bd7df8 MC |
2110 | if (!scsi_eh_target_reset(shost, work_q, done_q)) |
2111 | if (!scsi_eh_bus_reset(shost, work_q, done_q)) | |
91921e01 | 2112 | if (!scsi_eh_host_reset(shost, work_q, done_q)) |
30bd7df8 MC |
2113 | scsi_eh_offline_sdevs(work_q, |
2114 | done_q); | |
1da177e4 | 2115 | } |
dca84e46 | 2116 | EXPORT_SYMBOL_GPL(scsi_eh_ready_devs); |
1da177e4 LT |
2117 | |
2118 | /** | |
2119 | * scsi_eh_flush_done_q - finish processed commands or retry them. | |
2120 | * @done_q: list_head of processed commands. | |
dc8875e1 | 2121 | */ |
041c5fc3 | 2122 | void scsi_eh_flush_done_q(struct list_head *done_q) |
1da177e4 | 2123 | { |
937abeaa | 2124 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 2125 | |
937abeaa CH |
2126 | list_for_each_entry_safe(scmd, next, done_q, eh_entry) { |
2127 | list_del_init(&scmd->eh_entry); | |
1da177e4 | 2128 | if (scsi_device_online(scmd->device) && |
60bee27b MK |
2129 | !scsi_noretry_cmd(scmd) && scsi_cmd_retry_allowed(scmd) && |
2130 | scsi_eh_should_retry_cmd(scmd)) { | |
91921e01 HR |
2131 | SCSI_LOG_ERROR_RECOVERY(3, |
2132 | scmd_printk(KERN_INFO, scmd, | |
470613b4 HR |
2133 | "%s: flush retry cmd\n", |
2134 | current->comm)); | |
1da177e4 LT |
2135 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); |
2136 | } else { | |
793698ce PM |
2137 | /* |
2138 | * If just we got sense for the device (called | |
2139 | * scsi_eh_get_sense), scmd->result is already | |
2140 | * set, do not set DRIVER_TIMEOUT. | |
2141 | */ | |
1da177e4 LT |
2142 | if (!scmd->result) |
2143 | scmd->result |= (DRIVER_TIMEOUT << 24); | |
91921e01 HR |
2144 | SCSI_LOG_ERROR_RECOVERY(3, |
2145 | scmd_printk(KERN_INFO, scmd, | |
470613b4 HR |
2146 | "%s: flush finish cmd\n", |
2147 | current->comm)); | |
1da177e4 LT |
2148 | scsi_finish_command(scmd); |
2149 | } | |
2150 | } | |
2151 | } | |
041c5fc3 | 2152 | EXPORT_SYMBOL(scsi_eh_flush_done_q); |
1da177e4 LT |
2153 | |
2154 | /** | |
2155 | * scsi_unjam_host - Attempt to fix a host which has a cmd that failed. | |
2156 | * @shost: Host to unjam. | |
2157 | * | |
2158 | * Notes: | |
2159 | * When we come in here, we *know* that all commands on the bus have | |
2160 | * either completed, failed or timed out. we also know that no further | |
2161 | * commands are being sent to the host, so things are relatively quiet | |
2162 | * and we have freedom to fiddle with things as we wish. | |
2163 | * | |
2164 | * This is only the *default* implementation. it is possible for | |
2165 | * individual drivers to supply their own version of this function, and | |
2166 | * if the maintainer wishes to do this, it is strongly suggested that | |
2167 | * this function be taken as a template and modified. this function | |
2168 | * was designed to correctly handle problems for about 95% of the | |
2169 | * different cases out there, and it should always provide at least a | |
2170 | * reasonable amount of error recovery. | |
2171 | * | |
2172 | * Any command marked 'failed' or 'timeout' must eventually have | |
2173 | * scsi_finish_cmd() called for it. we do all of the retry stuff | |
2174 | * here, so when we restart the host after we return it should have an | |
2175 | * empty queue. | |
dc8875e1 | 2176 | */ |
1da177e4 LT |
2177 | static void scsi_unjam_host(struct Scsi_Host *shost) |
2178 | { | |
2179 | unsigned long flags; | |
2180 | LIST_HEAD(eh_work_q); | |
2181 | LIST_HEAD(eh_done_q); | |
2182 | ||
2183 | spin_lock_irqsave(shost->host_lock, flags); | |
2184 | list_splice_init(&shost->eh_cmd_q, &eh_work_q); | |
2185 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2186 | ||
2187 | SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost, &eh_work_q)); | |
2188 | ||
2189 | if (!scsi_eh_get_sense(&eh_work_q, &eh_done_q)) | |
a0658632 | 2190 | scsi_eh_ready_devs(shost, &eh_work_q, &eh_done_q); |
1da177e4 | 2191 | |
b4562022 | 2192 | spin_lock_irqsave(shost->host_lock, flags); |
bb3b621a | 2193 | if (shost->eh_deadline != -1) |
b4562022 HR |
2194 | shost->last_reset = 0; |
2195 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
2196 | scsi_eh_flush_done_q(&eh_done_q); |
2197 | } | |
2198 | ||
2199 | /** | |
ad42eb1b | 2200 | * scsi_error_handler - SCSI error handler thread |
1da177e4 LT |
2201 | * @data: Host for which we are running. |
2202 | * | |
2203 | * Notes: | |
ad42eb1b CH |
2204 | * This is the main error handling loop. This is run as a kernel thread |
2205 | * for every SCSI host and handles all error handling activity. | |
dc8875e1 | 2206 | */ |
1da177e4 LT |
2207 | int scsi_error_handler(void *data) |
2208 | { | |
ad42eb1b | 2209 | struct Scsi_Host *shost = data; |
1da177e4 | 2210 | |
1da177e4 | 2211 | /* |
ad42eb1b CH |
2212 | * We use TASK_INTERRUPTIBLE so that the thread is not |
2213 | * counted against the load average as a running process. | |
2214 | * We never actually get interrupted because kthread_run | |
c03264a7 | 2215 | * disables signal delivery for the created thread. |
1da177e4 | 2216 | */ |
537b604c MH |
2217 | while (true) { |
2218 | /* | |
2219 | * The sequence in kthread_stop() sets the stop flag first | |
2220 | * then wakes the process. To avoid missed wakeups, the task | |
2221 | * should always be in a non running state before the stop | |
2222 | * flag is checked | |
2223 | */ | |
b9d5c6b7 | 2224 | set_current_state(TASK_INTERRUPTIBLE); |
537b604c MH |
2225 | if (kthread_should_stop()) |
2226 | break; | |
2227 | ||
ee7863bc | 2228 | if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) || |
c84b023a | 2229 | shost->host_failed != scsi_host_busy(shost)) { |
ad42eb1b | 2230 | SCSI_LOG_ERROR_RECOVERY(1, |
91921e01 HR |
2231 | shost_printk(KERN_INFO, shost, |
2232 | "scsi_eh_%d: sleeping\n", | |
2233 | shost->host_no)); | |
3ed7a470 | 2234 | schedule(); |
3ed7a470 JB |
2235 | continue; |
2236 | } | |
1da177e4 | 2237 | |
3ed7a470 | 2238 | __set_current_state(TASK_RUNNING); |
ad42eb1b | 2239 | SCSI_LOG_ERROR_RECOVERY(1, |
91921e01 HR |
2240 | shost_printk(KERN_INFO, shost, |
2241 | "scsi_eh_%d: waking up %d/%d/%d\n", | |
2242 | shost->host_no, shost->host_eh_scheduled, | |
74665016 | 2243 | shost->host_failed, |
c84b023a | 2244 | scsi_host_busy(shost))); |
1da177e4 | 2245 | |
1da177e4 LT |
2246 | /* |
2247 | * We have a host that is failing for some reason. Figure out | |
2248 | * what we need to do to get it up and online again (if we can). | |
2249 | * If we fail, we end up taking the thing offline. | |
2250 | */ | |
ae0751ff | 2251 | if (!shost->eh_noresume && scsi_autopm_get_host(shost) != 0) { |
bc4f2401 | 2252 | SCSI_LOG_ERROR_RECOVERY(1, |
a222b1e2 HR |
2253 | shost_printk(KERN_ERR, shost, |
2254 | "scsi_eh_%d: unable to autoresume\n", | |
2255 | shost->host_no)); | |
bc4f2401 AS |
2256 | continue; |
2257 | } | |
2258 | ||
9227c33d CH |
2259 | if (shost->transportt->eh_strategy_handler) |
2260 | shost->transportt->eh_strategy_handler(shost); | |
1da177e4 LT |
2261 | else |
2262 | scsi_unjam_host(shost); | |
2263 | ||
72d8c36e WF |
2264 | /* All scmds have been handled */ |
2265 | shost->host_failed = 0; | |
2266 | ||
1da177e4 LT |
2267 | /* |
2268 | * Note - if the above fails completely, the action is to take | |
2269 | * individual devices offline and flush the queue of any | |
2270 | * outstanding requests that may have been pending. When we | |
2271 | * restart, we restart any I/O to any other devices on the bus | |
2272 | * which are still online. | |
2273 | */ | |
2274 | scsi_restart_operations(shost); | |
ae0751ff LM |
2275 | if (!shost->eh_noresume) |
2276 | scsi_autopm_put_host(shost); | |
1da177e4 | 2277 | } |
461a0ffb SR |
2278 | __set_current_state(TASK_RUNNING); |
2279 | ||
ad42eb1b | 2280 | SCSI_LOG_ERROR_RECOVERY(1, |
91921e01 HR |
2281 | shost_printk(KERN_INFO, shost, |
2282 | "Error handler scsi_eh_%d exiting\n", | |
2283 | shost->host_no)); | |
3ed7a470 | 2284 | shost->ehandler = NULL; |
1da177e4 LT |
2285 | return 0; |
2286 | } | |
2287 | ||
2288 | /* | |
2289 | * Function: scsi_report_bus_reset() | |
2290 | * | |
2291 | * Purpose: Utility function used by low-level drivers to report that | |
2292 | * they have observed a bus reset on the bus being handled. | |
2293 | * | |
2294 | * Arguments: shost - Host in question | |
2295 | * channel - channel on which reset was observed. | |
2296 | * | |
2297 | * Returns: Nothing | |
2298 | * | |
2299 | * Lock status: Host lock must be held. | |
2300 | * | |
2301 | * Notes: This only needs to be called if the reset is one which | |
2302 | * originates from an unknown location. Resets originated | |
2303 | * by the mid-level itself don't need to call this, but there | |
2304 | * should be no harm. | |
2305 | * | |
2306 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
2307 | * is properly treated. | |
2308 | */ | |
2309 | void scsi_report_bus_reset(struct Scsi_Host *shost, int channel) | |
2310 | { | |
2311 | struct scsi_device *sdev; | |
2312 | ||
2313 | __shost_for_each_device(sdev, shost) { | |
30bd7df8 MC |
2314 | if (channel == sdev_channel(sdev)) |
2315 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
2316 | } |
2317 | } | |
2318 | EXPORT_SYMBOL(scsi_report_bus_reset); | |
2319 | ||
2320 | /* | |
2321 | * Function: scsi_report_device_reset() | |
2322 | * | |
2323 | * Purpose: Utility function used by low-level drivers to report that | |
2324 | * they have observed a device reset on the device being handled. | |
2325 | * | |
2326 | * Arguments: shost - Host in question | |
2327 | * channel - channel on which reset was observed | |
2328 | * target - target on which reset was observed | |
2329 | * | |
2330 | * Returns: Nothing | |
2331 | * | |
2332 | * Lock status: Host lock must be held | |
2333 | * | |
2334 | * Notes: This only needs to be called if the reset is one which | |
2335 | * originates from an unknown location. Resets originated | |
2336 | * by the mid-level itself don't need to call this, but there | |
2337 | * should be no harm. | |
2338 | * | |
2339 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
2340 | * is properly treated. | |
2341 | */ | |
2342 | void scsi_report_device_reset(struct Scsi_Host *shost, int channel, int target) | |
2343 | { | |
2344 | struct scsi_device *sdev; | |
2345 | ||
2346 | __shost_for_each_device(sdev, shost) { | |
422c0d61 | 2347 | if (channel == sdev_channel(sdev) && |
30bd7df8 MC |
2348 | target == sdev_id(sdev)) |
2349 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
2350 | } |
2351 | } | |
2352 | EXPORT_SYMBOL(scsi_report_device_reset); | |
2353 | ||
2354 | static void | |
2355 | scsi_reset_provider_done_command(struct scsi_cmnd *scmd) | |
2356 | { | |
2357 | } | |
2358 | ||
176aa9d6 CH |
2359 | /** |
2360 | * scsi_ioctl_reset: explicitly reset a host/bus/target/device | |
2361 | * @dev: scsi_device to operate on | |
2362 | * @arg: reset type (see sg.h) | |
1da177e4 LT |
2363 | */ |
2364 | int | |
176aa9d6 | 2365 | scsi_ioctl_reset(struct scsi_device *dev, int __user *arg) |
1da177e4 | 2366 | { |
bc4f2401 | 2367 | struct scsi_cmnd *scmd; |
d7a1bb0a | 2368 | struct Scsi_Host *shost = dev->host; |
e9c787e6 | 2369 | struct request *rq; |
d7a1bb0a | 2370 | unsigned long flags; |
b8e162f9 BVA |
2371 | int error = 0, val; |
2372 | enum scsi_disposition rtn; | |
176aa9d6 CH |
2373 | |
2374 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2375 | return -EACCES; | |
2376 | ||
2377 | error = get_user(val, arg); | |
2378 | if (error) | |
2379 | return error; | |
1da177e4 | 2380 | |
bc4f2401 | 2381 | if (scsi_autopm_get_host(shost) < 0) |
176aa9d6 | 2382 | return -EIO; |
bc4f2401 | 2383 | |
176aa9d6 | 2384 | error = -EIO; |
e9c787e6 CH |
2385 | rq = kzalloc(sizeof(struct request) + sizeof(struct scsi_cmnd) + |
2386 | shost->hostt->cmd_size, GFP_KERNEL); | |
2387 | if (!rq) | |
95eeb5f5 | 2388 | goto out_put_autopm_host; |
e9c787e6 | 2389 | blk_rq_init(NULL, rq); |
95eeb5f5 | 2390 | |
e9c787e6 CH |
2391 | scmd = (struct scsi_cmnd *)(rq + 1); |
2392 | scsi_init_command(dev, scmd); | |
2393 | scmd->request = rq; | |
82ed4db4 | 2394 | scmd->cmnd = scsi_req(rq)->cmd; |
64a87b24 | 2395 | |
1da177e4 | 2396 | scmd->scsi_done = scsi_reset_provider_done_command; |
30b0c37b | 2397 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
1da177e4 LT |
2398 | |
2399 | scmd->cmd_len = 0; | |
2400 | ||
2401 | scmd->sc_data_direction = DMA_BIDIRECTIONAL; | |
1da177e4 | 2402 | |
d7a1bb0a JS |
2403 | spin_lock_irqsave(shost->host_lock, flags); |
2404 | shost->tmf_in_progress = 1; | |
2405 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2406 | ||
176aa9d6 CH |
2407 | switch (val & ~SG_SCSI_RESET_NO_ESCALATE) { |
2408 | case SG_SCSI_RESET_NOTHING: | |
2409 | rtn = SUCCESS; | |
2410 | break; | |
2411 | case SG_SCSI_RESET_DEVICE: | |
1da177e4 | 2412 | rtn = scsi_try_bus_device_reset(scmd); |
176aa9d6 | 2413 | if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE)) |
1da177e4 | 2414 | break; |
df561f66 | 2415 | fallthrough; |
176aa9d6 | 2416 | case SG_SCSI_RESET_TARGET: |
30bd7df8 | 2417 | rtn = scsi_try_target_reset(scmd); |
176aa9d6 | 2418 | if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE)) |
30bd7df8 | 2419 | break; |
df561f66 | 2420 | fallthrough; |
176aa9d6 | 2421 | case SG_SCSI_RESET_BUS: |
1da177e4 | 2422 | rtn = scsi_try_bus_reset(scmd); |
176aa9d6 | 2423 | if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE)) |
1da177e4 | 2424 | break; |
df561f66 | 2425 | fallthrough; |
176aa9d6 | 2426 | case SG_SCSI_RESET_HOST: |
1da177e4 | 2427 | rtn = scsi_try_host_reset(scmd); |
176aa9d6 CH |
2428 | if (rtn == SUCCESS) |
2429 | break; | |
df561f66 | 2430 | fallthrough; |
3bf2ff67 | 2431 | default: |
1da177e4 | 2432 | rtn = FAILED; |
176aa9d6 | 2433 | break; |
1da177e4 LT |
2434 | } |
2435 | ||
176aa9d6 CH |
2436 | error = (rtn == SUCCESS) ? 0 : -EIO; |
2437 | ||
d7a1bb0a JS |
2438 | spin_lock_irqsave(shost->host_lock, flags); |
2439 | shost->tmf_in_progress = 0; | |
2440 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2441 | ||
2442 | /* | |
2443 | * be sure to wake up anyone who was sleeping or had their queue | |
2444 | * suspended while we performed the TMF. | |
2445 | */ | |
2446 | SCSI_LOG_ERROR_RECOVERY(3, | |
91921e01 HR |
2447 | shost_printk(KERN_INFO, shost, |
2448 | "waking up host to restart after TMF\n")); | |
d7a1bb0a JS |
2449 | |
2450 | wake_up(&shost->host_wait); | |
d7a1bb0a JS |
2451 | scsi_run_host_queues(shost); |
2452 | ||
e9c787e6 | 2453 | kfree(rq); |
0f121dd8 | 2454 | |
04796336 | 2455 | out_put_autopm_host: |
bc4f2401 | 2456 | scsi_autopm_put_host(shost); |
176aa9d6 | 2457 | return error; |
1da177e4 | 2458 | } |
1da177e4 | 2459 | |
4753cbc0 HR |
2460 | bool scsi_command_normalize_sense(const struct scsi_cmnd *cmd, |
2461 | struct scsi_sense_hdr *sshdr) | |
1da177e4 LT |
2462 | { |
2463 | return scsi_normalize_sense(cmd->sense_buffer, | |
b80ca4f7 | 2464 | SCSI_SENSE_BUFFERSIZE, sshdr); |
1da177e4 LT |
2465 | } |
2466 | EXPORT_SYMBOL(scsi_command_normalize_sense); | |
2467 | ||
1da177e4 | 2468 | /** |
eb44820c | 2469 | * scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor format) |
1da177e4 LT |
2470 | * @sense_buffer: byte array of sense data |
2471 | * @sb_len: number of valid bytes in sense_buffer | |
2472 | * @info_out: pointer to 64 integer where 8 or 4 byte information | |
2473 | * field will be placed if found. | |
2474 | * | |
2475 | * Return value: | |
2908769c | 2476 | * true if information field found, false if not found. |
dc8875e1 | 2477 | */ |
2908769c DLM |
2478 | bool scsi_get_sense_info_fld(const u8 *sense_buffer, int sb_len, |
2479 | u64 *info_out) | |
1da177e4 | 2480 | { |
1da177e4 | 2481 | const u8 * ucp; |
1da177e4 LT |
2482 | |
2483 | if (sb_len < 7) | |
2908769c | 2484 | return false; |
1da177e4 LT |
2485 | switch (sense_buffer[0] & 0x7f) { |
2486 | case 0x70: | |
2487 | case 0x71: | |
2488 | if (sense_buffer[0] & 0x80) { | |
2908769c DLM |
2489 | *info_out = get_unaligned_be32(&sense_buffer[3]); |
2490 | return true; | |
2491 | } | |
2492 | return false; | |
1da177e4 LT |
2493 | case 0x72: |
2494 | case 0x73: | |
2495 | ucp = scsi_sense_desc_find(sense_buffer, sb_len, | |
2496 | 0 /* info desc */); | |
2497 | if (ucp && (0xa == ucp[1])) { | |
2908769c DLM |
2498 | *info_out = get_unaligned_be64(&ucp[4]); |
2499 | return true; | |
2500 | } | |
2501 | return false; | |
1da177e4 | 2502 | default: |
2908769c | 2503 | return false; |
1da177e4 LT |
2504 | } |
2505 | } | |
2506 | EXPORT_SYMBOL(scsi_get_sense_info_fld); |