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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 | ||
0b7fa56e EM |
138 | static void scsi_eh_complete_abort(struct scsi_cmnd *scmd, struct Scsi_Host *shost) |
139 | { | |
140 | unsigned long flags; | |
141 | ||
142 | spin_lock_irqsave(shost->host_lock, flags); | |
143 | list_del_init(&scmd->eh_entry); | |
144 | /* | |
145 | * If the abort succeeds, and there is no further | |
146 | * EH action, clear the ->last_reset time. | |
147 | */ | |
148 | if (list_empty(&shost->eh_abort_list) && | |
149 | list_empty(&shost->eh_cmd_q)) | |
150 | if (shost->eh_deadline != -1) | |
151 | shost->last_reset = 0; | |
152 | spin_unlock_irqrestore(shost->host_lock, flags); | |
153 | } | |
154 | ||
e494f6a7 HR |
155 | /** |
156 | * scmd_eh_abort_handler - Handle command aborts | |
157 | * @work: command to be aborted. | |
923f46f9 BVA |
158 | * |
159 | * Note: this function must be called only for a command that has timed out. | |
160 | * Because the block layer marks a request as complete before it calls | |
161 | * scsi_times_out(), a .scsi_done() call from the LLD for a command that has | |
162 | * timed out do not have any effect. Hence it is safe to call | |
163 | * scsi_finish_command() from this function. | |
e494f6a7 HR |
164 | */ |
165 | void | |
166 | scmd_eh_abort_handler(struct work_struct *work) | |
167 | { | |
168 | struct scsi_cmnd *scmd = | |
169 | container_of(work, struct scsi_cmnd, abort_work.work); | |
170 | struct scsi_device *sdev = scmd->device; | |
b8e162f9 | 171 | enum scsi_disposition rtn; |
0b7fa56e | 172 | unsigned long flags; |
e494f6a7 | 173 | |
e494f6a7 | 174 | if (scsi_host_eh_past_deadline(sdev->host)) { |
e494f6a7 HR |
175 | SCSI_LOG_ERROR_RECOVERY(3, |
176 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 177 | "eh timeout, not aborting\n")); |
e494f6a7 | 178 | } else { |
e494f6a7 HR |
179 | SCSI_LOG_ERROR_RECOVERY(3, |
180 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 181 | "aborting command\n")); |
e494f6a7 HR |
182 | rtn = scsi_try_to_abort_cmd(sdev->host->hostt, scmd); |
183 | if (rtn == SUCCESS) { | |
8922a908 | 184 | set_host_byte(scmd, DID_TIME_OUT); |
bb3b621a RM |
185 | if (scsi_host_eh_past_deadline(sdev->host)) { |
186 | SCSI_LOG_ERROR_RECOVERY(3, | |
187 | scmd_printk(KERN_INFO, scmd, | |
470613b4 HR |
188 | "eh timeout, not retrying " |
189 | "aborted command\n")); | |
bb3b621a | 190 | } else if (!scsi_noretry_cmd(scmd) && |
60bee27b MK |
191 | scsi_cmd_retry_allowed(scmd) && |
192 | scsi_eh_should_retry_cmd(scmd)) { | |
e494f6a7 HR |
193 | SCSI_LOG_ERROR_RECOVERY(3, |
194 | scmd_printk(KERN_WARNING, scmd, | |
470613b4 | 195 | "retry aborted command\n")); |
0b7fa56e | 196 | scsi_eh_complete_abort(scmd, sdev->host); |
e494f6a7 | 197 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); |
bb3b621a | 198 | return; |
e494f6a7 HR |
199 | } else { |
200 | SCSI_LOG_ERROR_RECOVERY(3, | |
201 | scmd_printk(KERN_WARNING, scmd, | |
470613b4 | 202 | "finish aborted command\n")); |
0b7fa56e | 203 | scsi_eh_complete_abort(scmd, sdev->host); |
e494f6a7 | 204 | scsi_finish_command(scmd); |
bb3b621a | 205 | return; |
e494f6a7 | 206 | } |
bb3b621a RM |
207 | } else { |
208 | SCSI_LOG_ERROR_RECOVERY(3, | |
209 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 210 | "cmd abort %s\n", |
883a030f HR |
211 | (rtn == FAST_IO_FAIL) ? |
212 | "not send" : "failed")); | |
e494f6a7 | 213 | } |
e494f6a7 HR |
214 | } |
215 | ||
0b7fa56e EM |
216 | spin_lock_irqsave(sdev->host->host_lock, flags); |
217 | list_del_init(&scmd->eh_entry); | |
218 | spin_unlock_irqrestore(sdev->host->host_lock, flags); | |
a0658632 | 219 | scsi_eh_scmd_add(scmd); |
e494f6a7 HR |
220 | } |
221 | ||
222 | /** | |
223 | * scsi_abort_command - schedule a command abort | |
224 | * @scmd: scmd to abort. | |
225 | * | |
226 | * We only need to abort commands after a command timeout | |
227 | */ | |
228 | static int | |
229 | scsi_abort_command(struct scsi_cmnd *scmd) | |
230 | { | |
231 | struct scsi_device *sdev = scmd->device; | |
232 | struct Scsi_Host *shost = sdev->host; | |
233 | unsigned long flags; | |
234 | ||
235 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) { | |
236 | /* | |
237 | * Retry after abort failed, escalate to next level. | |
238 | */ | |
239 | SCSI_LOG_ERROR_RECOVERY(3, | |
240 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 241 | "previous abort failed\n")); |
fcc95a76 | 242 | BUG_ON(delayed_work_pending(&scmd->abort_work)); |
e494f6a7 HR |
243 | return FAILED; |
244 | } | |
245 | ||
e494f6a7 | 246 | spin_lock_irqsave(shost->host_lock, flags); |
bb3b621a | 247 | if (shost->eh_deadline != -1 && !shost->last_reset) |
e494f6a7 | 248 | shost->last_reset = jiffies; |
0b7fa56e EM |
249 | BUG_ON(!list_empty(&scmd->eh_entry)); |
250 | list_add_tail(&scmd->eh_entry, &shost->eh_abort_list); | |
e494f6a7 HR |
251 | spin_unlock_irqrestore(shost->host_lock, flags); |
252 | ||
253 | scmd->eh_eflags |= SCSI_EH_ABORT_SCHEDULED; | |
254 | SCSI_LOG_ERROR_RECOVERY(3, | |
470613b4 | 255 | scmd_printk(KERN_INFO, scmd, "abort scheduled\n")); |
e494f6a7 HR |
256 | queue_delayed_work(shost->tmf_work_q, &scmd->abort_work, HZ / 100); |
257 | return SUCCESS; | |
258 | } | |
259 | ||
1da177e4 | 260 | /** |
7a38dc0b | 261 | * scsi_eh_reset - call into ->eh_action to reset internal counters |
1da177e4 | 262 | * @scmd: scmd to run eh on. |
1da177e4 | 263 | * |
7a38dc0b HR |
264 | * The scsi driver might be carrying internal state about the |
265 | * devices, so we need to call into the driver to reset the | |
266 | * internal state once the error handler is started. | |
dc8875e1 | 267 | */ |
7a38dc0b HR |
268 | static void scsi_eh_reset(struct scsi_cmnd *scmd) |
269 | { | |
aa8e25e5 | 270 | if (!blk_rq_is_passthrough(scsi_cmd_to_rq(scmd))) { |
7a38dc0b HR |
271 | struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd); |
272 | if (sdrv->eh_reset) | |
273 | sdrv->eh_reset(scmd); | |
274 | } | |
275 | } | |
276 | ||
3bd6f43f BVA |
277 | static void scsi_eh_inc_host_failed(struct rcu_head *head) |
278 | { | |
3be8828f BVA |
279 | struct scsi_cmnd *scmd = container_of(head, typeof(*scmd), rcu); |
280 | struct Scsi_Host *shost = scmd->device->host; | |
3bd6f43f BVA |
281 | unsigned long flags; |
282 | ||
283 | spin_lock_irqsave(shost->host_lock, flags); | |
284 | shost->host_failed++; | |
285 | scsi_eh_wakeup(shost); | |
286 | spin_unlock_irqrestore(shost->host_lock, flags); | |
287 | } | |
288 | ||
1da177e4 LT |
289 | /** |
290 | * scsi_eh_scmd_add - add scsi cmd to error handling. | |
291 | * @scmd: scmd to run eh on. | |
dc8875e1 | 292 | */ |
a0658632 | 293 | void scsi_eh_scmd_add(struct scsi_cmnd *scmd) |
1da177e4 LT |
294 | { |
295 | struct Scsi_Host *shost = scmd->device->host; | |
296 | unsigned long flags; | |
2171b6d0 | 297 | int ret; |
1da177e4 | 298 | |
2171b6d0 | 299 | WARN_ON_ONCE(!shost->ehandler); |
1da177e4 LT |
300 | |
301 | spin_lock_irqsave(shost->host_lock, flags); | |
2171b6d0 HR |
302 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) { |
303 | ret = scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY); | |
304 | WARN_ON_ONCE(ret); | |
305 | } | |
bb3b621a | 306 | if (shost->eh_deadline != -1 && !shost->last_reset) |
b4562022 HR |
307 | shost->last_reset = jiffies; |
308 | ||
7a38dc0b | 309 | scsi_eh_reset(scmd); |
1da177e4 | 310 | list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q); |
1da177e4 | 311 | spin_unlock_irqrestore(shost->host_lock, flags); |
3bd6f43f BVA |
312 | /* |
313 | * Ensure that all tasks observe the host state change before the | |
314 | * host_failed change. | |
315 | */ | |
3be8828f | 316 | call_rcu(&scmd->rcu, scsi_eh_inc_host_failed); |
1da177e4 LT |
317 | } |
318 | ||
1da177e4 LT |
319 | /** |
320 | * scsi_times_out - Timeout function for normal scsi commands. | |
242f9dcb | 321 | * @req: request that is timing out. |
1da177e4 LT |
322 | * |
323 | * Notes: | |
324 | * We do not need to lock this. There is the potential for a race | |
325 | * only in that the normal completion handling might run, but if the | |
326 | * normal completion function determines that the timer has already | |
327 | * fired, then it mustn't do anything. | |
dc8875e1 | 328 | */ |
242f9dcb | 329 | enum blk_eh_timer_return scsi_times_out(struct request *req) |
1da177e4 | 330 | { |
bed2213d | 331 | struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(req); |
6600593c | 332 | enum blk_eh_timer_return rtn = BLK_EH_DONE; |
0bf8c869 | 333 | struct Scsi_Host *host = scmd->device->host; |
6c5f8ce1 | 334 | |
bf816235 | 335 | trace_scsi_dispatch_cmd_timeout(scmd); |
1da177e4 LT |
336 | scsi_log_completion(scmd, TIMEOUT_ERROR); |
337 | ||
bb3b621a | 338 | if (host->eh_deadline != -1 && !host->last_reset) |
b4562022 HR |
339 | host->last_reset = jiffies; |
340 | ||
b6a05c82 | 341 | if (host->hostt->eh_timed_out) |
0bf8c869 | 342 | rtn = host->hostt->eh_timed_out(scmd); |
1da177e4 | 343 | |
6600593c | 344 | if (rtn == BLK_EH_DONE) { |
065990bd | 345 | /* |
f1342709 KB |
346 | * Set the command to complete first in order to prevent a real |
347 | * completion from releasing the command while error handling | |
348 | * is using it. If the command was already completed, then the | |
349 | * lower level driver beat the timeout handler, and it is safe | |
350 | * to return without escalating error recovery. | |
065990bd | 351 | * |
f1342709 KB |
352 | * If timeout handling lost the race to a real completion, the |
353 | * block layer may ignore that due to a fake timeout injection, | |
354 | * so return RESET_TIMER to allow error handling another shot | |
355 | * at this command. | |
065990bd | 356 | */ |
f1342709 KB |
357 | if (test_and_set_bit(SCMD_STATE_COMPLETE, &scmd->state)) |
358 | return BLK_EH_RESET_TIMER; | |
a0658632 | 359 | if (scsi_abort_command(scmd) != SUCCESS) { |
2171b6d0 | 360 | set_host_byte(scmd, DID_TIME_OUT); |
a0658632 | 361 | scsi_eh_scmd_add(scmd); |
2171b6d0 | 362 | } |
a33c070b | 363 | } |
242f9dcb | 364 | |
fa990781 | 365 | return rtn; |
1da177e4 LT |
366 | } |
367 | ||
368 | /** | |
369 | * scsi_block_when_processing_errors - Prevent cmds from being queued. | |
370 | * @sdev: Device on which we are performing recovery. | |
371 | * | |
372 | * Description: | |
373 | * We block until the host is out of error recovery, and then check to | |
374 | * see whether the host or the device is offline. | |
375 | * | |
376 | * Return value: | |
377 | * 0 when dev was taken offline by error recovery. 1 OK to proceed. | |
dc8875e1 | 378 | */ |
1da177e4 LT |
379 | int scsi_block_when_processing_errors(struct scsi_device *sdev) |
380 | { | |
381 | int online; | |
382 | ||
939647ee | 383 | wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host)); |
1da177e4 LT |
384 | |
385 | online = scsi_device_online(sdev); | |
386 | ||
1da177e4 LT |
387 | return online; |
388 | } | |
389 | EXPORT_SYMBOL(scsi_block_when_processing_errors); | |
390 | ||
391 | #ifdef CONFIG_SCSI_LOGGING | |
392 | /** | |
393 | * scsi_eh_prt_fail_stats - Log info on failures. | |
394 | * @shost: scsi host being recovered. | |
395 | * @work_q: Queue of scsi cmds to process. | |
dc8875e1 | 396 | */ |
1da177e4 LT |
397 | static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost, |
398 | struct list_head *work_q) | |
399 | { | |
400 | struct scsi_cmnd *scmd; | |
401 | struct scsi_device *sdev; | |
402 | int total_failures = 0; | |
403 | int cmd_failed = 0; | |
404 | int cmd_cancel = 0; | |
405 | int devices_failed = 0; | |
406 | ||
407 | shost_for_each_device(sdev, shost) { | |
408 | list_for_each_entry(scmd, work_q, eh_entry) { | |
409 | if (scmd->device == sdev) { | |
410 | ++total_failures; | |
a0658632 | 411 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) |
1da177e4 | 412 | ++cmd_cancel; |
0bf8c869 | 413 | else |
1da177e4 LT |
414 | ++cmd_failed; |
415 | } | |
416 | } | |
417 | ||
418 | if (cmd_cancel || cmd_failed) { | |
419 | SCSI_LOG_ERROR_RECOVERY(3, | |
a3a790dc | 420 | shost_printk(KERN_INFO, shost, |
9ccfc756 | 421 | "%s: cmds failed: %d, cancel: %d\n", |
cadbd4a5 | 422 | __func__, cmd_failed, |
9ccfc756 | 423 | cmd_cancel)); |
1da177e4 LT |
424 | cmd_cancel = 0; |
425 | cmd_failed = 0; | |
426 | ++devices_failed; | |
427 | } | |
428 | } | |
429 | ||
91921e01 HR |
430 | SCSI_LOG_ERROR_RECOVERY(2, shost_printk(KERN_INFO, shost, |
431 | "Total of %d commands on %d" | |
432 | " devices require eh work\n", | |
0bf8c869 | 433 | total_failures, devices_failed)); |
1da177e4 LT |
434 | } |
435 | #endif | |
436 | ||
279afdfe EM |
437 | /** |
438 | * scsi_report_lun_change - Set flag on all *other* devices on the same target | |
439 | * to indicate that a UNIT ATTENTION is expected. | |
440 | * @sdev: Device reporting the UNIT ATTENTION | |
441 | */ | |
442 | static void scsi_report_lun_change(struct scsi_device *sdev) | |
443 | { | |
444 | sdev->sdev_target->expecting_lun_change = 1; | |
445 | } | |
446 | ||
447 | /** | |
448 | * scsi_report_sense - Examine scsi sense information and log messages for | |
449 | * certain conditions, also issue uevents for some of them. | |
450 | * @sdev: Device reporting the sense code | |
451 | * @sshdr: sshdr to be examined | |
452 | */ | |
453 | static void scsi_report_sense(struct scsi_device *sdev, | |
454 | struct scsi_sense_hdr *sshdr) | |
455 | { | |
456 | enum scsi_device_event evt_type = SDEV_EVT_MAXBITS; /* i.e. none */ | |
457 | ||
458 | if (sshdr->sense_key == UNIT_ATTENTION) { | |
459 | if (sshdr->asc == 0x3f && sshdr->ascq == 0x03) { | |
460 | evt_type = SDEV_EVT_INQUIRY_CHANGE_REPORTED; | |
461 | sdev_printk(KERN_WARNING, sdev, | |
462 | "Inquiry data has changed"); | |
463 | } else if (sshdr->asc == 0x3f && sshdr->ascq == 0x0e) { | |
464 | evt_type = SDEV_EVT_LUN_CHANGE_REPORTED; | |
465 | scsi_report_lun_change(sdev); | |
466 | sdev_printk(KERN_WARNING, sdev, | |
467 | "Warning! Received an indication that the " | |
468 | "LUN assignments on this target have " | |
469 | "changed. The Linux SCSI layer does not " | |
470 | "automatically remap LUN assignments.\n"); | |
471 | } else if (sshdr->asc == 0x3f) | |
472 | sdev_printk(KERN_WARNING, sdev, | |
473 | "Warning! Received an indication that the " | |
474 | "operating parameters on this target have " | |
475 | "changed. The Linux SCSI layer does not " | |
476 | "automatically adjust these parameters.\n"); | |
477 | ||
478 | if (sshdr->asc == 0x38 && sshdr->ascq == 0x07) { | |
479 | evt_type = SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED; | |
480 | sdev_printk(KERN_WARNING, sdev, | |
481 | "Warning! Received an indication that the " | |
482 | "LUN reached a thin provisioning soft " | |
483 | "threshold.\n"); | |
484 | } | |
485 | ||
cf3431bb HR |
486 | if (sshdr->asc == 0x29) { |
487 | evt_type = SDEV_EVT_POWER_ON_RESET_OCCURRED; | |
e2fea87d AH |
488 | /* |
489 | * Do not print message if it is an expected side-effect | |
490 | * of runtime PM. | |
491 | */ | |
492 | if (!sdev->silence_suspend) | |
493 | sdev_printk(KERN_WARNING, sdev, | |
494 | "Power-on or device reset occurred\n"); | |
cf3431bb HR |
495 | } |
496 | ||
279afdfe EM |
497 | if (sshdr->asc == 0x2a && sshdr->ascq == 0x01) { |
498 | evt_type = SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED; | |
499 | sdev_printk(KERN_WARNING, sdev, | |
500 | "Mode parameters changed"); | |
14c3e677 HR |
501 | } else if (sshdr->asc == 0x2a && sshdr->ascq == 0x06) { |
502 | evt_type = SDEV_EVT_ALUA_STATE_CHANGE_REPORTED; | |
503 | sdev_printk(KERN_WARNING, sdev, | |
504 | "Asymmetric access state changed"); | |
279afdfe EM |
505 | } else if (sshdr->asc == 0x2a && sshdr->ascq == 0x09) { |
506 | evt_type = SDEV_EVT_CAPACITY_CHANGE_REPORTED; | |
507 | sdev_printk(KERN_WARNING, sdev, | |
508 | "Capacity data has changed"); | |
509 | } else if (sshdr->asc == 0x2a) | |
510 | sdev_printk(KERN_WARNING, sdev, | |
511 | "Parameters changed"); | |
512 | } | |
513 | ||
514 | if (evt_type != SDEV_EVT_MAXBITS) { | |
515 | set_bit(evt_type, sdev->pending_events); | |
516 | schedule_work(&sdev->event_work); | |
517 | } | |
518 | } | |
519 | ||
1da177e4 LT |
520 | /** |
521 | * scsi_check_sense - Examine scsi cmd sense | |
522 | * @scmd: Cmd to have sense checked. | |
523 | * | |
524 | * Return value: | |
87f14e65 | 525 | * SUCCESS or FAILED or NEEDS_RETRY or ADD_TO_MLQUEUE |
1da177e4 LT |
526 | * |
527 | * Notes: | |
528 | * When a deferred error is detected the current command has | |
529 | * not been executed and needs retrying. | |
dc8875e1 | 530 | */ |
b8e162f9 | 531 | enum scsi_disposition scsi_check_sense(struct scsi_cmnd *scmd) |
1da177e4 | 532 | { |
a6a8d9f8 | 533 | struct scsi_device *sdev = scmd->device; |
1da177e4 LT |
534 | struct scsi_sense_hdr sshdr; |
535 | ||
536 | if (! scsi_command_normalize_sense(scmd, &sshdr)) | |
537 | return FAILED; /* no valid sense data */ | |
538 | ||
279afdfe EM |
539 | scsi_report_sense(sdev, &sshdr); |
540 | ||
1da177e4 LT |
541 | if (scsi_sense_is_deferred(&sshdr)) |
542 | return NEEDS_RETRY; | |
543 | ||
ee14c674 | 544 | if (sdev->handler && sdev->handler->check_sense) { |
b8e162f9 | 545 | enum scsi_disposition rc; |
a6a8d9f8 | 546 | |
ee14c674 | 547 | rc = sdev->handler->check_sense(sdev, &sshdr); |
a6a8d9f8 CS |
548 | if (rc != SCSI_RETURN_NOT_HANDLED) |
549 | return rc; | |
550 | /* handler does not care. Drop down to default handling */ | |
551 | } | |
552 | ||
e925cc43 CH |
553 | if (scmd->cmnd[0] == TEST_UNIT_READY && scmd->scsi_done != scsi_eh_done) |
554 | /* | |
555 | * nasty: for mid-layer issued TURs, we need to return the | |
556 | * actual sense data without any recovery attempt. For eh | |
557 | * issued ones, we need to try to recover and interpret | |
558 | */ | |
559 | return SUCCESS; | |
560 | ||
1da177e4 LT |
561 | /* |
562 | * Previous logic looked for FILEMARK, EOM or ILI which are | |
563 | * mainly associated with tapes and returned SUCCESS. | |
564 | */ | |
565 | if (sshdr.response_code == 0x70) { | |
566 | /* fixed format */ | |
567 | if (scmd->sense_buffer[2] & 0xe0) | |
568 | return SUCCESS; | |
569 | } else { | |
570 | /* | |
571 | * descriptor format: look for "stream commands sense data | |
572 | * descriptor" (see SSC-3). Assume single sense data | |
573 | * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG. | |
574 | */ | |
575 | if ((sshdr.additional_length > 3) && | |
576 | (scmd->sense_buffer[8] == 0x4) && | |
577 | (scmd->sense_buffer[11] & 0xe0)) | |
578 | return SUCCESS; | |
579 | } | |
580 | ||
581 | switch (sshdr.sense_key) { | |
582 | case NO_SENSE: | |
583 | return SUCCESS; | |
584 | case RECOVERED_ERROR: | |
585 | return /* soft_error */ SUCCESS; | |
586 | ||
587 | case ABORTED_COMMAND: | |
511e44f4 MP |
588 | if (sshdr.asc == 0x10) /* DIF */ |
589 | return SUCCESS; | |
590 | ||
29cfc2ab MW |
591 | if (sshdr.asc == 0x44 && sdev->sdev_bflags & BLIST_RETRY_ITF) |
592 | return ADD_TO_MLQUEUE; | |
c3606520 MW |
593 | if (sshdr.asc == 0xc1 && sshdr.ascq == 0x01 && |
594 | sdev->sdev_bflags & BLIST_RETRY_ASC_C1) | |
595 | return ADD_TO_MLQUEUE; | |
29cfc2ab | 596 | |
1da177e4 LT |
597 | return NEEDS_RETRY; |
598 | case NOT_READY: | |
599 | case UNIT_ATTENTION: | |
600 | /* | |
601 | * if we are expecting a cc/ua because of a bus reset that we | |
602 | * performed, treat this just as a retry. otherwise this is | |
603 | * information that we should pass up to the upper-level driver | |
604 | * so that we can deal with it there. | |
605 | */ | |
606 | if (scmd->device->expecting_cc_ua) { | |
dfcf7775 TH |
607 | /* |
608 | * Because some device does not queue unit | |
609 | * attentions correctly, we carefully check | |
610 | * additional sense code and qualifier so as | |
611 | * not to squash media change unit attention. | |
612 | */ | |
613 | if (sshdr.asc != 0x28 || sshdr.ascq != 0x00) { | |
614 | scmd->device->expecting_cc_ua = 0; | |
615 | return NEEDS_RETRY; | |
616 | } | |
1da177e4 | 617 | } |
279afdfe EM |
618 | /* |
619 | * we might also expect a cc/ua if another LUN on the target | |
620 | * reported a UA with an ASC/ASCQ of 3F 0E - | |
621 | * REPORTED LUNS DATA HAS CHANGED. | |
622 | */ | |
623 | if (scmd->device->sdev_target->expecting_lun_change && | |
624 | sshdr.asc == 0x3f && sshdr.ascq == 0x0e) | |
625 | return NEEDS_RETRY; | |
1da177e4 | 626 | /* |
0bf8c869 | 627 | * if the device is in the process of becoming ready, we |
1da177e4 LT |
628 | * should retry. |
629 | */ | |
630 | if ((sshdr.asc == 0x04) && (sshdr.ascq == 0x01)) | |
631 | return NEEDS_RETRY; | |
632 | /* | |
633 | * if the device is not started, we need to wake | |
634 | * the error handler to start the motor | |
635 | */ | |
636 | if (scmd->device->allow_restart && | |
637 | (sshdr.asc == 0x04) && (sshdr.ascq == 0x02)) | |
638 | return FAILED; | |
02e031cb CH |
639 | /* |
640 | * Pass the UA upwards for a determination in the completion | |
641 | * functions. | |
642 | */ | |
643 | return SUCCESS; | |
1da177e4 | 644 | |
63583cca | 645 | /* these are not supported */ |
a9d6ceb8 HR |
646 | case DATA_PROTECT: |
647 | if (sshdr.asc == 0x27 && sshdr.ascq == 0x07) { | |
648 | /* Thin provisioning hard threshold reached */ | |
649 | set_host_byte(scmd, DID_ALLOC_FAILURE); | |
650 | return SUCCESS; | |
651 | } | |
df561f66 | 652 | fallthrough; |
1da177e4 LT |
653 | case COPY_ABORTED: |
654 | case VOLUME_OVERFLOW: | |
655 | case MISCOMPARE: | |
63583cca | 656 | case BLANK_CHECK: |
87f14e65 HR |
657 | set_host_byte(scmd, DID_TARGET_FAILURE); |
658 | return SUCCESS; | |
1da177e4 LT |
659 | |
660 | case MEDIUM_ERROR: | |
fd1b494d LT |
661 | if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */ |
662 | sshdr.asc == 0x13 || /* AMNF DATA FIELD */ | |
663 | sshdr.asc == 0x14) { /* RECORD NOT FOUND */ | |
7e782af5 | 664 | set_host_byte(scmd, DID_MEDIUM_ERROR); |
87f14e65 | 665 | return SUCCESS; |
fd1b494d | 666 | } |
1da177e4 LT |
667 | return NEEDS_RETRY; |
668 | ||
669 | case HARDWARE_ERROR: | |
670 | if (scmd->device->retry_hwerror) | |
bb0003c1 | 671 | return ADD_TO_MLQUEUE; |
1da177e4 | 672 | else |
87f14e65 | 673 | set_host_byte(scmd, DID_TARGET_FAILURE); |
df561f66 | 674 | fallthrough; |
1da177e4 LT |
675 | |
676 | case ILLEGAL_REQUEST: | |
47ac56db MS |
677 | if (sshdr.asc == 0x20 || /* Invalid command operation code */ |
678 | sshdr.asc == 0x21 || /* Logical block address out of range */ | |
a8bbb2ab | 679 | sshdr.asc == 0x22 || /* Invalid function */ |
47ac56db | 680 | sshdr.asc == 0x24 || /* Invalid field in cdb */ |
d0b7a909 MW |
681 | sshdr.asc == 0x26 || /* Parameter value invalid */ |
682 | sshdr.asc == 0x27) { /* Write protected */ | |
87f14e65 | 683 | set_host_byte(scmd, DID_TARGET_FAILURE); |
47ac56db MS |
684 | } |
685 | return SUCCESS; | |
686 | ||
1da177e4 LT |
687 | default: |
688 | return SUCCESS; | |
689 | } | |
690 | } | |
3852e373 | 691 | EXPORT_SYMBOL_GPL(scsi_check_sense); |
1da177e4 | 692 | |
4a84067d VD |
693 | static void scsi_handle_queue_ramp_up(struct scsi_device *sdev) |
694 | { | |
695 | struct scsi_host_template *sht = sdev->host->hostt; | |
696 | struct scsi_device *tmp_sdev; | |
697 | ||
c40ecc12 | 698 | if (!sht->track_queue_depth || |
4a84067d VD |
699 | sdev->queue_depth >= sdev->max_queue_depth) |
700 | return; | |
701 | ||
702 | if (time_before(jiffies, | |
703 | sdev->last_queue_ramp_up + sdev->queue_ramp_up_period)) | |
704 | return; | |
705 | ||
706 | if (time_before(jiffies, | |
707 | sdev->last_queue_full_time + sdev->queue_ramp_up_period)) | |
708 | return; | |
709 | ||
710 | /* | |
711 | * Walk all devices of a target and do | |
712 | * ramp up on them. | |
713 | */ | |
714 | shost_for_each_device(tmp_sdev, sdev->host) { | |
715 | if (tmp_sdev->channel != sdev->channel || | |
716 | tmp_sdev->id != sdev->id || | |
717 | tmp_sdev->queue_depth == sdev->max_queue_depth) | |
718 | continue; | |
c40ecc12 | 719 | |
db5ed4df | 720 | scsi_change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1); |
4a84067d VD |
721 | sdev->last_queue_ramp_up = jiffies; |
722 | } | |
723 | } | |
724 | ||
42a6a918 MC |
725 | static void scsi_handle_queue_full(struct scsi_device *sdev) |
726 | { | |
727 | struct scsi_host_template *sht = sdev->host->hostt; | |
728 | struct scsi_device *tmp_sdev; | |
729 | ||
c40ecc12 | 730 | if (!sht->track_queue_depth) |
42a6a918 MC |
731 | return; |
732 | ||
733 | shost_for_each_device(tmp_sdev, sdev->host) { | |
734 | if (tmp_sdev->channel != sdev->channel || | |
735 | tmp_sdev->id != sdev->id) | |
736 | continue; | |
737 | /* | |
738 | * We do not know the number of commands that were at | |
739 | * the device when we got the queue full so we start | |
740 | * from the highest possible value and work our way down. | |
741 | */ | |
c40ecc12 | 742 | scsi_track_queue_full(tmp_sdev, tmp_sdev->queue_depth - 1); |
42a6a918 MC |
743 | } |
744 | } | |
745 | ||
1da177e4 LT |
746 | /** |
747 | * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD. | |
748 | * @scmd: SCSI cmd to examine. | |
749 | * | |
750 | * Notes: | |
751 | * This is *only* called when we are examining the status of commands | |
752 | * queued during error recovery. the main difference here is that we | |
753 | * don't allow for the possibility of retries here, and we are a lot | |
754 | * more restrictive about what we consider acceptable. | |
dc8875e1 | 755 | */ |
b8e162f9 | 756 | static enum scsi_disposition scsi_eh_completed_normally(struct scsi_cmnd *scmd) |
1da177e4 LT |
757 | { |
758 | /* | |
759 | * first check the host byte, to see if there is anything in there | |
760 | * that would indicate what we need to do. | |
761 | */ | |
762 | if (host_byte(scmd->result) == DID_RESET) { | |
763 | /* | |
764 | * rats. we are already in the error handler, so we now | |
765 | * get to try and figure out what to do next. if the sense | |
766 | * is valid, we have a pretty good idea of what to do. | |
767 | * if not, we mark it as FAILED. | |
768 | */ | |
769 | return scsi_check_sense(scmd); | |
770 | } | |
771 | if (host_byte(scmd->result) != DID_OK) | |
772 | return FAILED; | |
773 | ||
1da177e4 LT |
774 | /* |
775 | * now, check the status byte to see if this indicates | |
776 | * anything special. | |
777 | */ | |
3d45cefc HR |
778 | switch (get_status_byte(scmd)) { |
779 | case SAM_STAT_GOOD: | |
4a84067d | 780 | scsi_handle_queue_ramp_up(scmd->device); |
df561f66 | 781 | fallthrough; |
3d45cefc | 782 | case SAM_STAT_COMMAND_TERMINATED: |
1da177e4 | 783 | return SUCCESS; |
3d45cefc | 784 | case SAM_STAT_CHECK_CONDITION: |
1da177e4 | 785 | return scsi_check_sense(scmd); |
3d45cefc HR |
786 | case SAM_STAT_CONDITION_MET: |
787 | case SAM_STAT_INTERMEDIATE: | |
788 | case SAM_STAT_INTERMEDIATE_CONDITION_MET: | |
1da177e4 LT |
789 | /* |
790 | * who knows? FIXME(eric) | |
791 | */ | |
792 | return SUCCESS; | |
3d45cefc | 793 | case SAM_STAT_RESERVATION_CONFLICT: |
67110dfd JB |
794 | if (scmd->cmnd[0] == TEST_UNIT_READY) |
795 | /* it is a success, we probed the device and | |
796 | * found it */ | |
797 | return SUCCESS; | |
798 | /* otherwise, we failed to send the command */ | |
799 | return FAILED; | |
3d45cefc | 800 | case SAM_STAT_TASK_SET_FULL: |
42a6a918 | 801 | scsi_handle_queue_full(scmd->device); |
df561f66 | 802 | fallthrough; |
3d45cefc | 803 | case SAM_STAT_BUSY: |
3eb3a928 | 804 | return NEEDS_RETRY; |
1da177e4 LT |
805 | default: |
806 | return FAILED; | |
807 | } | |
808 | return FAILED; | |
809 | } | |
810 | ||
1da177e4 LT |
811 | /** |
812 | * scsi_eh_done - Completion function for error handling. | |
813 | * @scmd: Cmd that is done. | |
dc8875e1 | 814 | */ |
1da177e4 LT |
815 | static void scsi_eh_done(struct scsi_cmnd *scmd) |
816 | { | |
0bf8c869 | 817 | struct completion *eh_action; |
85631672 | 818 | |
91921e01 | 819 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
470613b4 | 820 | "%s result: %x\n", __func__, scmd->result)); |
85631672 MR |
821 | |
822 | eh_action = scmd->device->host->eh_action; | |
823 | if (eh_action) | |
824 | complete(eh_action); | |
1da177e4 LT |
825 | } |
826 | ||
292148f8 BK |
827 | /** |
828 | * scsi_try_host_reset - ask host adapter to reset itself | |
c2b3ebd0 | 829 | * @scmd: SCSI cmd to send host reset. |
dc8875e1 | 830 | */ |
b8e162f9 | 831 | static enum scsi_disposition scsi_try_host_reset(struct scsi_cmnd *scmd) |
292148f8 BK |
832 | { |
833 | unsigned long flags; | |
b8e162f9 | 834 | enum scsi_disposition rtn; |
0bf8c869 JJ |
835 | struct Scsi_Host *host = scmd->device->host; |
836 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 | 837 | |
91921e01 HR |
838 | SCSI_LOG_ERROR_RECOVERY(3, |
839 | shost_printk(KERN_INFO, host, "Snd Host RST\n")); | |
292148f8 | 840 | |
0bf8c869 | 841 | if (!hostt->eh_host_reset_handler) |
292148f8 BK |
842 | return FAILED; |
843 | ||
0bf8c869 | 844 | rtn = hostt->eh_host_reset_handler(scmd); |
292148f8 BK |
845 | |
846 | if (rtn == SUCCESS) { | |
0bf8c869 | 847 | if (!hostt->skip_settle_delay) |
292148f8 | 848 | ssleep(HOST_RESET_SETTLE_TIME); |
0bf8c869 JJ |
849 | spin_lock_irqsave(host->host_lock, flags); |
850 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
851 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
852 | } |
853 | ||
854 | return rtn; | |
855 | } | |
856 | ||
857 | /** | |
858 | * scsi_try_bus_reset - ask host to perform a bus reset | |
859 | * @scmd: SCSI cmd to send bus reset. | |
dc8875e1 | 860 | */ |
b8e162f9 | 861 | static enum scsi_disposition scsi_try_bus_reset(struct scsi_cmnd *scmd) |
292148f8 BK |
862 | { |
863 | unsigned long flags; | |
b8e162f9 | 864 | enum scsi_disposition rtn; |
0bf8c869 JJ |
865 | struct Scsi_Host *host = scmd->device->host; |
866 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 | 867 | |
91921e01 HR |
868 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
869 | "%s: Snd Bus RST\n", __func__)); | |
292148f8 | 870 | |
0bf8c869 | 871 | if (!hostt->eh_bus_reset_handler) |
292148f8 BK |
872 | return FAILED; |
873 | ||
0bf8c869 | 874 | rtn = hostt->eh_bus_reset_handler(scmd); |
292148f8 BK |
875 | |
876 | if (rtn == SUCCESS) { | |
0bf8c869 | 877 | if (!hostt->skip_settle_delay) |
292148f8 | 878 | ssleep(BUS_RESET_SETTLE_TIME); |
0bf8c869 JJ |
879 | spin_lock_irqsave(host->host_lock, flags); |
880 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
881 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
882 | } |
883 | ||
884 | return rtn; | |
885 | } | |
886 | ||
30bd7df8 MC |
887 | static void __scsi_report_device_reset(struct scsi_device *sdev, void *data) |
888 | { | |
889 | sdev->was_reset = 1; | |
890 | sdev->expecting_cc_ua = 1; | |
891 | } | |
892 | ||
893 | /** | |
894 | * scsi_try_target_reset - Ask host to perform a target reset | |
895 | * @scmd: SCSI cmd used to send a target reset | |
896 | * | |
897 | * Notes: | |
898 | * There is no timeout for this operation. if this operation is | |
899 | * unreliable for a given host, then the host itself needs to put a | |
900 | * timer on it, and set the host back to a consistent state prior to | |
901 | * returning. | |
902 | */ | |
b8e162f9 | 903 | static enum scsi_disposition scsi_try_target_reset(struct scsi_cmnd *scmd) |
30bd7df8 MC |
904 | { |
905 | unsigned long flags; | |
b8e162f9 | 906 | enum scsi_disposition rtn; |
0bf8c869 JJ |
907 | struct Scsi_Host *host = scmd->device->host; |
908 | struct scsi_host_template *hostt = host->hostt; | |
30bd7df8 | 909 | |
0bf8c869 | 910 | if (!hostt->eh_target_reset_handler) |
30bd7df8 MC |
911 | return FAILED; |
912 | ||
0bf8c869 | 913 | rtn = hostt->eh_target_reset_handler(scmd); |
30bd7df8 | 914 | if (rtn == SUCCESS) { |
0bf8c869 | 915 | spin_lock_irqsave(host->host_lock, flags); |
30bd7df8 MC |
916 | __starget_for_each_device(scsi_target(scmd->device), NULL, |
917 | __scsi_report_device_reset); | |
0bf8c869 | 918 | spin_unlock_irqrestore(host->host_lock, flags); |
30bd7df8 MC |
919 | } |
920 | ||
921 | return rtn; | |
922 | } | |
923 | ||
292148f8 BK |
924 | /** |
925 | * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev | |
926 | * @scmd: SCSI cmd used to send BDR | |
927 | * | |
928 | * Notes: | |
929 | * There is no timeout for this operation. if this operation is | |
930 | * unreliable for a given host, then the host itself needs to put a | |
931 | * timer on it, and set the host back to a consistent state prior to | |
932 | * returning. | |
dc8875e1 | 933 | */ |
b8e162f9 | 934 | static enum scsi_disposition scsi_try_bus_device_reset(struct scsi_cmnd *scmd) |
292148f8 | 935 | { |
b8e162f9 | 936 | enum scsi_disposition rtn; |
0bf8c869 | 937 | struct scsi_host_template *hostt = scmd->device->host->hostt; |
292148f8 | 938 | |
0bf8c869 | 939 | if (!hostt->eh_device_reset_handler) |
292148f8 BK |
940 | return FAILED; |
941 | ||
0bf8c869 | 942 | rtn = hostt->eh_device_reset_handler(scmd); |
30bd7df8 MC |
943 | if (rtn == SUCCESS) |
944 | __scsi_report_device_reset(scmd->device, NULL); | |
292148f8 BK |
945 | return rtn; |
946 | } | |
947 | ||
883a030f HR |
948 | /** |
949 | * scsi_try_to_abort_cmd - Ask host to abort a SCSI command | |
6583f6fb | 950 | * @hostt: SCSI driver host template |
883a030f HR |
951 | * @scmd: SCSI cmd used to send a target reset |
952 | * | |
953 | * Return value: | |
954 | * SUCCESS, FAILED, or FAST_IO_FAIL | |
955 | * | |
956 | * Notes: | |
957 | * SUCCESS does not necessarily indicate that the command | |
958 | * has been aborted; it only indicates that the LLDDs | |
959 | * has cleared all references to that command. | |
960 | * LLDDs should return FAILED only if an abort was required | |
961 | * but could not be executed. LLDDs should return FAST_IO_FAIL | |
962 | * if the device is temporarily unavailable (eg due to a | |
963 | * link down on FibreChannel) | |
964 | */ | |
b8e162f9 BVA |
965 | static enum scsi_disposition |
966 | scsi_try_to_abort_cmd(struct scsi_host_template *hostt, struct scsi_cmnd *scmd) | |
292148f8 | 967 | { |
0bf8c869 | 968 | if (!hostt->eh_abort_handler) |
292148f8 BK |
969 | return FAILED; |
970 | ||
0bf8c869 | 971 | return hostt->eh_abort_handler(scmd); |
292148f8 BK |
972 | } |
973 | ||
292148f8 BK |
974 | static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd) |
975 | { | |
0bf8c869 | 976 | if (scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd) != SUCCESS) |
292148f8 | 977 | if (scsi_try_bus_device_reset(scmd) != SUCCESS) |
30bd7df8 MC |
978 | if (scsi_try_target_reset(scmd) != SUCCESS) |
979 | if (scsi_try_bus_reset(scmd) != SUCCESS) | |
980 | scsi_try_host_reset(scmd); | |
292148f8 BK |
981 | } |
982 | ||
1da177e4 | 983 | /** |
3b729f76 | 984 | * scsi_eh_prep_cmnd - Save a scsi command info as part of error recovery |
2dc611de | 985 | * @scmd: SCSI command structure to hijack |
e1c23468 | 986 | * @ses: structure to save restore information |
55db6c1b | 987 | * @cmnd: CDB to send. Can be NULL if no new cmnd is needed |
64a87b24 | 988 | * @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB) |
55db6c1b | 989 | * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored) |
2dc611de | 990 | * |
e1c23468 | 991 | * This function is used to save a scsi command information before re-execution |
55db6c1b BH |
992 | * as part of the error recovery process. If @sense_bytes is 0 the command |
993 | * sent must be one that does not transfer any data. If @sense_bytes != 0 | |
994 | * @cmnd is ignored and this functions sets up a REQUEST_SENSE command | |
995 | * and cmnd buffers to read @sense_bytes into @scmd->sense_buffer. | |
dc8875e1 | 996 | */ |
e1c23468 BH |
997 | void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, |
998 | unsigned char *cmnd, int cmnd_size, unsigned sense_bytes) | |
1da177e4 | 999 | { |
f59114b7 | 1000 | struct scsi_device *sdev = scmd->device; |
1da177e4 | 1001 | |
631c228c CH |
1002 | /* |
1003 | * We need saved copies of a number of fields - this is because | |
1004 | * error handling may need to overwrite these with different values | |
1005 | * to run different commands, and once error handling is complete, | |
1006 | * we will need to restore these values prior to running the actual | |
1007 | * command. | |
1008 | */ | |
e1c23468 | 1009 | ses->cmd_len = scmd->cmd_len; |
64a87b24 | 1010 | ses->cmnd = scmd->cmnd; |
e1c23468 | 1011 | ses->data_direction = scmd->sc_data_direction; |
30b0c37b | 1012 | ses->sdb = scmd->sdb; |
e1c23468 | 1013 | ses->result = scmd->result; |
8f8fed0c | 1014 | ses->resid_len = scmd->req.resid_len; |
12265709 | 1015 | ses->underflow = scmd->underflow; |
db007fc5 | 1016 | ses->prot_op = scmd->prot_op; |
8e8c9d01 | 1017 | ses->eh_eflags = scmd->eh_eflags; |
631c228c | 1018 | |
db007fc5 | 1019 | scmd->prot_op = SCSI_PROT_NORMAL; |
c69e6f81 | 1020 | scmd->eh_eflags = 0; |
64a87b24 BH |
1021 | scmd->cmnd = ses->eh_cmnd; |
1022 | memset(scmd->cmnd, 0, BLK_MAX_CDB); | |
30b0c37b | 1023 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
644373a4 | 1024 | scmd->result = 0; |
8f8fed0c | 1025 | scmd->req.resid_len = 0; |
30b0c37b | 1026 | |
55db6c1b | 1027 | if (sense_bytes) { |
30b0c37b BH |
1028 | scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE, |
1029 | sense_bytes); | |
e1c23468 | 1030 | sg_init_one(&ses->sense_sgl, scmd->sense_buffer, |
30b0c37b BH |
1031 | scmd->sdb.length); |
1032 | scmd->sdb.table.sgl = &ses->sense_sgl; | |
55db6c1b | 1033 | scmd->sc_data_direction = DMA_FROM_DEVICE; |
0c958ecc | 1034 | scmd->sdb.table.nents = scmd->sdb.table.orig_nents = 1; |
55db6c1b | 1035 | scmd->cmnd[0] = REQUEST_SENSE; |
30b0c37b | 1036 | scmd->cmnd[4] = scmd->sdb.length; |
55db6c1b | 1037 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); |
631c228c | 1038 | } else { |
631c228c | 1039 | scmd->sc_data_direction = DMA_NONE; |
55db6c1b | 1040 | if (cmnd) { |
64a87b24 | 1041 | BUG_ON(cmnd_size > BLK_MAX_CDB); |
55db6c1b BH |
1042 | memcpy(scmd->cmnd, cmnd, cmnd_size); |
1043 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); | |
1044 | } | |
631c228c CH |
1045 | } |
1046 | ||
1047 | scmd->underflow = 0; | |
631c228c | 1048 | |
55db6c1b | 1049 | if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN) |
1da177e4 | 1050 | scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) | |
f59114b7 | 1051 | (sdev->lun << 5 & 0xe0); |
1da177e4 | 1052 | |
631c228c CH |
1053 | /* |
1054 | * Zero the sense buffer. The scsi spec mandates that any | |
1055 | * untransferred sense data should be interpreted as being zero. | |
1056 | */ | |
b80ca4f7 | 1057 | memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); |
e1c23468 BH |
1058 | } |
1059 | EXPORT_SYMBOL(scsi_eh_prep_cmnd); | |
1060 | ||
1061 | /** | |
3b729f76 | 1062 | * scsi_eh_restore_cmnd - Restore a scsi command info as part of error recovery |
e1c23468 | 1063 | * @scmd: SCSI command structure to restore |
477e608c | 1064 | * @ses: saved information from a coresponding call to scsi_eh_prep_cmnd |
e1c23468 | 1065 | * |
477e608c | 1066 | * Undo any damage done by above scsi_eh_prep_cmnd(). |
dc8875e1 | 1067 | */ |
e1c23468 BH |
1068 | void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses) |
1069 | { | |
1070 | /* | |
1071 | * Restore original data | |
1072 | */ | |
1073 | scmd->cmd_len = ses->cmd_len; | |
64a87b24 | 1074 | scmd->cmnd = ses->cmnd; |
e1c23468 | 1075 | scmd->sc_data_direction = ses->data_direction; |
30b0c37b | 1076 | scmd->sdb = ses->sdb; |
e1c23468 | 1077 | scmd->result = ses->result; |
8f8fed0c | 1078 | scmd->req.resid_len = ses->resid_len; |
12265709 | 1079 | scmd->underflow = ses->underflow; |
db007fc5 | 1080 | scmd->prot_op = ses->prot_op; |
8e8c9d01 | 1081 | scmd->eh_eflags = ses->eh_eflags; |
e1c23468 BH |
1082 | } |
1083 | EXPORT_SYMBOL(scsi_eh_restore_cmnd); | |
631c228c | 1084 | |
e1c23468 | 1085 | /** |
3b729f76 | 1086 | * scsi_send_eh_cmnd - submit a scsi command as part of error recovery |
e1c23468 BH |
1087 | * @scmd: SCSI command structure to hijack |
1088 | * @cmnd: CDB to send | |
1089 | * @cmnd_size: size in bytes of @cmnd | |
1090 | * @timeout: timeout for this request | |
1091 | * @sense_bytes: size of sense data to copy or 0 | |
1092 | * | |
1093 | * This function is used to send a scsi command down to a target device | |
1094 | * as part of the error recovery process. See also scsi_eh_prep_cmnd() above. | |
1095 | * | |
1096 | * Return value: | |
1097 | * SUCCESS or FAILED or NEEDS_RETRY | |
dc8875e1 | 1098 | */ |
b8e162f9 BVA |
1099 | static enum scsi_disposition scsi_send_eh_cmnd(struct scsi_cmnd *scmd, |
1100 | unsigned char *cmnd, int cmnd_size, int timeout, unsigned sense_bytes) | |
e1c23468 BH |
1101 | { |
1102 | struct scsi_device *sdev = scmd->device; | |
1103 | struct Scsi_Host *shost = sdev->host; | |
1104 | DECLARE_COMPLETION_ONSTACK(done); | |
bbe9fb0d | 1105 | unsigned long timeleft = timeout, delay; |
e1c23468 | 1106 | struct scsi_eh_save ses; |
fc73648a | 1107 | const unsigned long stall_for = msecs_to_jiffies(100); |
e1c23468 BH |
1108 | int rtn; |
1109 | ||
fc73648a | 1110 | retry: |
e1c23468 | 1111 | scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes); |
7dfdc9a5 | 1112 | shost->eh_action = &done; |
1da177e4 | 1113 | |
1da177e4 | 1114 | scsi_log_send(scmd); |
f281233d | 1115 | scmd->scsi_done = scsi_eh_done; |
bbe9fb0d BVA |
1116 | |
1117 | /* | |
1118 | * Lock sdev->state_mutex to avoid that scsi_device_quiesce() can | |
1119 | * change the SCSI device state after we have examined it and before | |
1120 | * .queuecommand() is called. | |
1121 | */ | |
1122 | mutex_lock(&sdev->state_mutex); | |
1123 | while (sdev->sdev_state == SDEV_BLOCK && timeleft > 0) { | |
1124 | mutex_unlock(&sdev->state_mutex); | |
1125 | SCSI_LOG_ERROR_RECOVERY(5, sdev_printk(KERN_DEBUG, sdev, | |
1126 | "%s: state %d <> %d\n", __func__, sdev->sdev_state, | |
1127 | SDEV_BLOCK)); | |
1128 | delay = min(timeleft, stall_for); | |
1129 | timeleft -= delay; | |
1130 | msleep(jiffies_to_msecs(delay)); | |
1131 | mutex_lock(&sdev->state_mutex); | |
1132 | } | |
1133 | if (sdev->sdev_state != SDEV_BLOCK) | |
1134 | rtn = shost->hostt->queuecommand(shost, scmd); | |
1135 | else | |
280e91b0 | 1136 | rtn = FAILED; |
bbe9fb0d BVA |
1137 | mutex_unlock(&sdev->state_mutex); |
1138 | ||
fc73648a HR |
1139 | if (rtn) { |
1140 | if (timeleft > stall_for) { | |
1141 | scsi_eh_restore_cmnd(scmd, &ses); | |
1142 | timeleft -= stall_for; | |
1143 | msleep(jiffies_to_msecs(stall_for)); | |
1144 | goto retry; | |
1145 | } | |
1146 | /* signal not to enter either branch of the if () below */ | |
1147 | timeleft = 0; | |
511833ac | 1148 | rtn = FAILED; |
fc73648a HR |
1149 | } else { |
1150 | timeleft = wait_for_completion_timeout(&done, timeout); | |
ac61d195 | 1151 | rtn = SUCCESS; |
fc73648a | 1152 | } |
1da177e4 | 1153 | |
f59114b7 | 1154 | shost->eh_action = NULL; |
1da177e4 | 1155 | |
fc73648a | 1156 | scsi_log_completion(scmd, rtn); |
1da177e4 | 1157 | |
91921e01 | 1158 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
470613b4 HR |
1159 | "%s timeleft: %ld\n", |
1160 | __func__, timeleft)); | |
1da177e4 LT |
1161 | |
1162 | /* | |
fc73648a HR |
1163 | * If there is time left scsi_eh_done got called, and we will examine |
1164 | * the actual status codes to see whether the command actually did | |
1165 | * complete normally, else if we have a zero return and no time left, | |
1166 | * the command must still be pending, so abort it and return FAILED. | |
1167 | * If we never actually managed to issue the command, because | |
1168 | * ->queuecommand() kept returning non zero, use the rtn = FAILED | |
1169 | * value above (so don't execute either branch of the if) | |
1da177e4 | 1170 | */ |
7dfdc9a5 | 1171 | if (timeleft) { |
1da177e4 | 1172 | rtn = scsi_eh_completed_normally(scmd); |
91921e01 HR |
1173 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
1174 | "%s: scsi_eh_completed_normally %x\n", __func__, rtn)); | |
7dfdc9a5 | 1175 | |
1da177e4 LT |
1176 | switch (rtn) { |
1177 | case SUCCESS: | |
1178 | case NEEDS_RETRY: | |
1179 | case FAILED: | |
1180 | break; | |
6e883b0e HR |
1181 | case ADD_TO_MLQUEUE: |
1182 | rtn = NEEDS_RETRY; | |
1183 | break; | |
1da177e4 LT |
1184 | default: |
1185 | rtn = FAILED; | |
1186 | break; | |
1187 | } | |
511833ac | 1188 | } else if (rtn != FAILED) { |
292148f8 | 1189 | scsi_abort_eh_cmnd(scmd); |
7dfdc9a5 | 1190 | rtn = FAILED; |
1da177e4 LT |
1191 | } |
1192 | ||
e1c23468 | 1193 | scsi_eh_restore_cmnd(scmd, &ses); |
18a4d0a2 | 1194 | |
1da177e4 LT |
1195 | return rtn; |
1196 | } | |
1197 | ||
1198 | /** | |
1199 | * scsi_request_sense - Request sense data from a particular target. | |
1200 | * @scmd: SCSI cmd for request sense. | |
1201 | * | |
1202 | * Notes: | |
1203 | * Some hosts automatically obtain this information, others require | |
1204 | * that we obtain it on our own. This function will *not* return until | |
1205 | * the command either times out, or it completes. | |
dc8875e1 | 1206 | */ |
b8e162f9 | 1207 | static enum scsi_disposition scsi_request_sense(struct scsi_cmnd *scmd) |
1da177e4 | 1208 | { |
0816c925 | 1209 | return scsi_send_eh_cmnd(scmd, NULL, 0, scmd->device->eh_timeout, ~0); |
1da177e4 LT |
1210 | } |
1211 | ||
b8e162f9 BVA |
1212 | static enum scsi_disposition |
1213 | scsi_eh_action(struct scsi_cmnd *scmd, enum scsi_disposition rtn) | |
2451079b | 1214 | { |
aa8e25e5 | 1215 | if (!blk_rq_is_passthrough(scsi_cmd_to_rq(scmd))) { |
2451079b JB |
1216 | struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd); |
1217 | if (sdrv->eh_action) | |
1218 | rtn = sdrv->eh_action(scmd, rtn); | |
1219 | } | |
1220 | return rtn; | |
1221 | } | |
1222 | ||
1da177e4 LT |
1223 | /** |
1224 | * scsi_eh_finish_cmd - Handle a cmd that eh is finished with. | |
1225 | * @scmd: Original SCSI cmd that eh has finished. | |
1226 | * @done_q: Queue for processed commands. | |
1227 | * | |
1228 | * Notes: | |
1229 | * We don't want to use the normal command completion while we are are | |
1230 | * still handling errors - it may cause other commands to be queued, | |
eb44820c | 1231 | * and that would disturb what we are doing. Thus we really want to |
1da177e4 LT |
1232 | * keep a list of pending commands for final completion, and once we |
1233 | * are ready to leave error handling we handle completion for real. | |
dc8875e1 | 1234 | */ |
041c5fc3 | 1235 | void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q) |
1da177e4 | 1236 | { |
1da177e4 LT |
1237 | list_move_tail(&scmd->eh_entry, done_q); |
1238 | } | |
041c5fc3 | 1239 | EXPORT_SYMBOL(scsi_eh_finish_cmd); |
1da177e4 LT |
1240 | |
1241 | /** | |
1242 | * scsi_eh_get_sense - Get device sense data. | |
1243 | * @work_q: Queue of commands to process. | |
eb44820c | 1244 | * @done_q: Queue of processed commands. |
1da177e4 LT |
1245 | * |
1246 | * Description: | |
1247 | * See if we need to request sense information. if so, then get it | |
0bf8c869 | 1248 | * now, so we have a better idea of what to do. |
1da177e4 LT |
1249 | * |
1250 | * Notes: | |
1251 | * This has the unfortunate side effect that if a shost adapter does | |
eb44820c | 1252 | * not automatically request sense information, we end up shutting |
1da177e4 LT |
1253 | * it down before we request it. |
1254 | * | |
1255 | * All drivers should request sense information internally these days, | |
1256 | * so for now all I have to say is tough noogies if you end up in here. | |
1257 | * | |
1258 | * XXX: Long term this code should go away, but that needs an audit of | |
1259 | * all LLDDs first. | |
dc8875e1 | 1260 | */ |
dca84e46 DW |
1261 | int scsi_eh_get_sense(struct list_head *work_q, |
1262 | struct list_head *done_q) | |
1da177e4 | 1263 | { |
937abeaa | 1264 | struct scsi_cmnd *scmd, *next; |
b4562022 | 1265 | struct Scsi_Host *shost; |
b8e162f9 | 1266 | enum scsi_disposition rtn; |
1da177e4 | 1267 | |
709c75b5 | 1268 | /* |
1269 | * If SCSI_EH_ABORT_SCHEDULED has been set, it is timeout IO, | |
1270 | * should not get sense. | |
1271 | */ | |
937abeaa | 1272 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
a0658632 | 1273 | if ((scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) || |
1da177e4 LT |
1274 | SCSI_SENSE_VALID(scmd)) |
1275 | continue; | |
1276 | ||
b4562022 | 1277 | shost = scmd->device->host; |
b4562022 | 1278 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 | 1279 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1280 | scmd_printk(KERN_INFO, scmd, |
1281 | "%s: skip request sense, past eh deadline\n", | |
1282 | current->comm)); | |
b4562022 HR |
1283 | break; |
1284 | } | |
d0672a03 | 1285 | if (!scsi_status_is_check_condition(scmd->result)) |
d555a2ab JB |
1286 | /* |
1287 | * don't request sense if there's no check condition | |
1288 | * status because the error we're processing isn't one | |
1289 | * that has a sense code (and some devices get | |
1290 | * confused by sense requests out of the blue) | |
1291 | */ | |
1292 | continue; | |
1293 | ||
3bf743e7 JG |
1294 | SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd, |
1295 | "%s: requesting sense\n", | |
1296 | current->comm)); | |
1da177e4 LT |
1297 | rtn = scsi_request_sense(scmd); |
1298 | if (rtn != SUCCESS) | |
1299 | continue; | |
1300 | ||
91921e01 | 1301 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
470613b4 | 1302 | "sense requested, result %x\n", scmd->result)); |
d811b848 | 1303 | SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense(scmd)); |
1da177e4 LT |
1304 | |
1305 | rtn = scsi_decide_disposition(scmd); | |
1306 | ||
1307 | /* | |
1308 | * if the result was normal, then just pass it along to the | |
1309 | * upper level. | |
1310 | */ | |
1311 | if (rtn == SUCCESS) | |
2a242d59 MC |
1312 | /* |
1313 | * We don't want this command reissued, just finished | |
1314 | * with the sense data, so set retries to the max | |
1315 | * allowed to ensure it won't get reissued. If the user | |
1316 | * has requested infinite retries, we also want to | |
1317 | * finish this command, so force completion by setting | |
1318 | * retries and allowed to the same value. | |
1319 | */ | |
1320 | if (scmd->allowed == SCSI_CMD_RETRIES_NO_LIMIT) | |
1321 | scmd->retries = scmd->allowed = 1; | |
1322 | else | |
1323 | scmd->retries = scmd->allowed; | |
1da177e4 LT |
1324 | else if (rtn != NEEDS_RETRY) |
1325 | continue; | |
1326 | ||
1327 | scsi_eh_finish_cmd(scmd, done_q); | |
1328 | } | |
1329 | ||
1330 | return list_empty(work_q); | |
1331 | } | |
dca84e46 | 1332 | EXPORT_SYMBOL_GPL(scsi_eh_get_sense); |
1da177e4 | 1333 | |
1da177e4 LT |
1334 | /** |
1335 | * scsi_eh_tur - Send TUR to device. | |
eb44820c | 1336 | * @scmd: &scsi_cmnd to send TUR |
1da177e4 LT |
1337 | * |
1338 | * Return value: | |
1339 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1340 | */ |
1da177e4 LT |
1341 | static int scsi_eh_tur(struct scsi_cmnd *scmd) |
1342 | { | |
1343 | static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0}; | |
b8e162f9 BVA |
1344 | int retry_cnt = 1; |
1345 | enum scsi_disposition rtn; | |
1da177e4 LT |
1346 | |
1347 | retry_tur: | |
0816c925 MP |
1348 | rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, |
1349 | scmd->device->eh_timeout, 0); | |
1da177e4 | 1350 | |
91921e01 | 1351 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
470613b4 | 1352 | "%s return: %x\n", __func__, rtn)); |
631c228c CH |
1353 | |
1354 | switch (rtn) { | |
1355 | case NEEDS_RETRY: | |
1da177e4 LT |
1356 | if (retry_cnt--) |
1357 | goto retry_tur; | |
df561f66 | 1358 | fallthrough; |
631c228c | 1359 | case SUCCESS: |
e47373ec | 1360 | return 0; |
631c228c CH |
1361 | default: |
1362 | return 1; | |
e47373ec | 1363 | } |
1da177e4 LT |
1364 | } |
1365 | ||
3eef6257 DJ |
1366 | /** |
1367 | * scsi_eh_test_devices - check if devices are responding from error recovery. | |
1368 | * @cmd_list: scsi commands in error recovery. | |
74cf298f RD |
1369 | * @work_q: queue for commands which still need more error recovery |
1370 | * @done_q: queue for commands which are finished | |
1371 | * @try_stu: boolean on if a STU command should be tried in addition to TUR. | |
3eef6257 DJ |
1372 | * |
1373 | * Decription: | |
1374 | * Tests if devices are in a working state. Commands to devices now in | |
1375 | * a working state are sent to the done_q while commands to devices which | |
1376 | * are still failing to respond are returned to the work_q for more | |
1377 | * processing. | |
1378 | **/ | |
1379 | static int scsi_eh_test_devices(struct list_head *cmd_list, | |
1380 | struct list_head *work_q, | |
1381 | struct list_head *done_q, int try_stu) | |
1382 | { | |
1383 | struct scsi_cmnd *scmd, *next; | |
1384 | struct scsi_device *sdev; | |
1385 | int finish_cmds; | |
1386 | ||
1387 | while (!list_empty(cmd_list)) { | |
1388 | scmd = list_entry(cmd_list->next, struct scsi_cmnd, eh_entry); | |
1389 | sdev = scmd->device; | |
1390 | ||
b4562022 | 1391 | if (!try_stu) { |
b4562022 HR |
1392 | if (scsi_host_eh_past_deadline(sdev->host)) { |
1393 | /* Push items back onto work_q */ | |
1394 | list_splice_init(cmd_list, work_q); | |
b4562022 | 1395 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1396 | sdev_printk(KERN_INFO, sdev, |
1397 | "%s: skip test device, past eh deadline", | |
1398 | current->comm)); | |
b4562022 HR |
1399 | break; |
1400 | } | |
b4562022 HR |
1401 | } |
1402 | ||
3eef6257 DJ |
1403 | finish_cmds = !scsi_device_online(scmd->device) || |
1404 | (try_stu && !scsi_eh_try_stu(scmd) && | |
1405 | !scsi_eh_tur(scmd)) || | |
1406 | !scsi_eh_tur(scmd); | |
1407 | ||
1408 | list_for_each_entry_safe(scmd, next, cmd_list, eh_entry) | |
1409 | if (scmd->device == sdev) { | |
2451079b JB |
1410 | if (finish_cmds && |
1411 | (try_stu || | |
1412 | scsi_eh_action(scmd, SUCCESS) == SUCCESS)) | |
3eef6257 DJ |
1413 | scsi_eh_finish_cmd(scmd, done_q); |
1414 | else | |
1415 | list_move_tail(&scmd->eh_entry, work_q); | |
1416 | } | |
1417 | } | |
1418 | return list_empty(work_q); | |
1419 | } | |
1420 | ||
1da177e4 LT |
1421 | /** |
1422 | * scsi_eh_try_stu - Send START_UNIT to device. | |
eb44820c | 1423 | * @scmd: &scsi_cmnd to send START_UNIT |
1da177e4 LT |
1424 | * |
1425 | * Return value: | |
1426 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1427 | */ |
1da177e4 LT |
1428 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd) |
1429 | { | |
1430 | static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0}; | |
1da177e4 | 1431 | |
631c228c | 1432 | if (scmd->device->allow_restart) { |
b8e162f9 BVA |
1433 | int i; |
1434 | enum scsi_disposition rtn = NEEDS_RETRY; | |
ed773e66 BK |
1435 | |
1436 | for (i = 0; rtn == NEEDS_RETRY && i < 2; i++) | |
9728c081 | 1437 | rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0); |
1da177e4 | 1438 | |
631c228c CH |
1439 | if (rtn == SUCCESS) |
1440 | return 0; | |
1441 | } | |
1da177e4 | 1442 | |
1da177e4 LT |
1443 | return 1; |
1444 | } | |
1445 | ||
1446 | /** | |
1447 | * scsi_eh_stu - send START_UNIT if needed | |
eb44820c | 1448 | * @shost: &scsi host being recovered. |
74cf298f | 1449 | * @work_q: &list_head for pending commands. |
eb44820c | 1450 | * @done_q: &list_head for processed commands. |
1da177e4 LT |
1451 | * |
1452 | * Notes: | |
1453 | * If commands are failing due to not ready, initializing command required, | |
0bf8c869 | 1454 | * try revalidating the device, which will end up sending a start unit. |
dc8875e1 | 1455 | */ |
1da177e4 LT |
1456 | static int scsi_eh_stu(struct Scsi_Host *shost, |
1457 | struct list_head *work_q, | |
1458 | struct list_head *done_q) | |
1459 | { | |
937abeaa | 1460 | struct scsi_cmnd *scmd, *stu_scmd, *next; |
1da177e4 LT |
1461 | struct scsi_device *sdev; |
1462 | ||
1463 | shost_for_each_device(sdev, shost) { | |
b4562022 | 1464 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 | 1465 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1466 | sdev_printk(KERN_INFO, sdev, |
1467 | "%s: skip START_UNIT, past eh deadline\n", | |
1468 | current->comm)); | |
4dea170f | 1469 | scsi_device_put(sdev); |
b4562022 HR |
1470 | break; |
1471 | } | |
1da177e4 LT |
1472 | stu_scmd = NULL; |
1473 | list_for_each_entry(scmd, work_q, eh_entry) | |
1474 | if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) && | |
1475 | scsi_check_sense(scmd) == FAILED ) { | |
1476 | stu_scmd = scmd; | |
1477 | break; | |
1478 | } | |
1479 | ||
1480 | if (!stu_scmd) | |
1481 | continue; | |
1482 | ||
91921e01 | 1483 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1484 | sdev_printk(KERN_INFO, sdev, |
1485 | "%s: Sending START_UNIT\n", | |
1486 | current->comm)); | |
1da177e4 LT |
1487 | |
1488 | if (!scsi_eh_try_stu(stu_scmd)) { | |
1489 | if (!scsi_device_online(sdev) || | |
1490 | !scsi_eh_tur(stu_scmd)) { | |
937abeaa CH |
1491 | list_for_each_entry_safe(scmd, next, |
1492 | work_q, eh_entry) { | |
2451079b JB |
1493 | if (scmd->device == sdev && |
1494 | scsi_eh_action(scmd, SUCCESS) == SUCCESS) | |
1da177e4 LT |
1495 | scsi_eh_finish_cmd(scmd, done_q); |
1496 | } | |
1497 | } | |
1498 | } else { | |
1499 | SCSI_LOG_ERROR_RECOVERY(3, | |
a222b1e2 HR |
1500 | sdev_printk(KERN_INFO, sdev, |
1501 | "%s: START_UNIT failed\n", | |
1502 | current->comm)); | |
1da177e4 LT |
1503 | } |
1504 | } | |
1505 | ||
1506 | return list_empty(work_q); | |
1507 | } | |
1508 | ||
1509 | ||
1510 | /** | |
1511 | * scsi_eh_bus_device_reset - send bdr if needed | |
1512 | * @shost: scsi host being recovered. | |
74cf298f | 1513 | * @work_q: &list_head for pending commands. |
eb44820c | 1514 | * @done_q: &list_head for processed commands. |
1da177e4 LT |
1515 | * |
1516 | * Notes: | |
eb44820c | 1517 | * Try a bus device reset. Still, look to see whether we have multiple |
1da177e4 LT |
1518 | * devices that are jammed or not - if we have multiple devices, it |
1519 | * makes no sense to try bus_device_reset - we really would need to try | |
0bf8c869 | 1520 | * a bus_reset instead. |
dc8875e1 | 1521 | */ |
1da177e4 LT |
1522 | static int scsi_eh_bus_device_reset(struct Scsi_Host *shost, |
1523 | struct list_head *work_q, | |
1524 | struct list_head *done_q) | |
1525 | { | |
937abeaa | 1526 | struct scsi_cmnd *scmd, *bdr_scmd, *next; |
1da177e4 | 1527 | struct scsi_device *sdev; |
b8e162f9 | 1528 | enum scsi_disposition rtn; |
1da177e4 LT |
1529 | |
1530 | shost_for_each_device(sdev, shost) { | |
b4562022 | 1531 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 | 1532 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1533 | sdev_printk(KERN_INFO, sdev, |
1534 | "%s: skip BDR, past eh deadline\n", | |
1535 | current->comm)); | |
4dea170f | 1536 | scsi_device_put(sdev); |
b4562022 HR |
1537 | break; |
1538 | } | |
1da177e4 LT |
1539 | bdr_scmd = NULL; |
1540 | list_for_each_entry(scmd, work_q, eh_entry) | |
1541 | if (scmd->device == sdev) { | |
1542 | bdr_scmd = scmd; | |
1543 | break; | |
1544 | } | |
1545 | ||
1546 | if (!bdr_scmd) | |
1547 | continue; | |
1548 | ||
91921e01 | 1549 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1550 | sdev_printk(KERN_INFO, sdev, |
1551 | "%s: Sending BDR\n", current->comm)); | |
1da177e4 | 1552 | rtn = scsi_try_bus_device_reset(bdr_scmd); |
2f2eb587 | 1553 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
1da177e4 | 1554 | if (!scsi_device_online(sdev) || |
2f2eb587 | 1555 | rtn == FAST_IO_FAIL || |
1da177e4 | 1556 | !scsi_eh_tur(bdr_scmd)) { |
937abeaa CH |
1557 | list_for_each_entry_safe(scmd, next, |
1558 | work_q, eh_entry) { | |
2451079b JB |
1559 | if (scmd->device == sdev && |
1560 | scsi_eh_action(scmd, rtn) != FAILED) | |
1da177e4 LT |
1561 | scsi_eh_finish_cmd(scmd, |
1562 | done_q); | |
1563 | } | |
1564 | } | |
1565 | } else { | |
91921e01 | 1566 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1567 | sdev_printk(KERN_INFO, sdev, |
1568 | "%s: BDR failed\n", current->comm)); | |
1da177e4 LT |
1569 | } |
1570 | } | |
1571 | ||
1572 | return list_empty(work_q); | |
1573 | } | |
1574 | ||
30bd7df8 MC |
1575 | /** |
1576 | * scsi_eh_target_reset - send target reset if needed | |
1577 | * @shost: scsi host being recovered. | |
74cf298f | 1578 | * @work_q: &list_head for pending commands. |
30bd7df8 MC |
1579 | * @done_q: &list_head for processed commands. |
1580 | * | |
1581 | * Notes: | |
1582 | * Try a target reset. | |
1583 | */ | |
1584 | static int scsi_eh_target_reset(struct Scsi_Host *shost, | |
1585 | struct list_head *work_q, | |
1586 | struct list_head *done_q) | |
1587 | { | |
98db5195 | 1588 | LIST_HEAD(tmp_list); |
3eef6257 | 1589 | LIST_HEAD(check_list); |
30bd7df8 | 1590 | |
98db5195 JB |
1591 | list_splice_init(work_q, &tmp_list); |
1592 | ||
1593 | while (!list_empty(&tmp_list)) { | |
1594 | struct scsi_cmnd *next, *scmd; | |
b8e162f9 | 1595 | enum scsi_disposition rtn; |
98db5195 | 1596 | unsigned int id; |
b4562022 | 1597 | |
b4562022 | 1598 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 HR |
1599 | /* push back on work queue for further processing */ |
1600 | list_splice_init(&check_list, work_q); | |
1601 | list_splice_init(&tmp_list, work_q); | |
1602 | SCSI_LOG_ERROR_RECOVERY(3, | |
1603 | shost_printk(KERN_INFO, shost, | |
a222b1e2 HR |
1604 | "%s: Skip target reset, past eh deadline\n", |
1605 | current->comm)); | |
b4562022 HR |
1606 | return list_empty(work_q); |
1607 | } | |
98db5195 JB |
1608 | |
1609 | scmd = list_entry(tmp_list.next, struct scsi_cmnd, eh_entry); | |
1610 | id = scmd_id(scmd); | |
30bd7df8 | 1611 | |
91921e01 HR |
1612 | SCSI_LOG_ERROR_RECOVERY(3, |
1613 | shost_printk(KERN_INFO, shost, | |
1614 | "%s: Sending target reset to target %d\n", | |
1615 | current->comm, id)); | |
98db5195 JB |
1616 | rtn = scsi_try_target_reset(scmd); |
1617 | if (rtn != SUCCESS && rtn != FAST_IO_FAIL) | |
91921e01 HR |
1618 | SCSI_LOG_ERROR_RECOVERY(3, |
1619 | shost_printk(KERN_INFO, shost, | |
1620 | "%s: Target reset failed" | |
1621 | " target: %d\n", | |
1622 | current->comm, id)); | |
98db5195 JB |
1623 | list_for_each_entry_safe(scmd, next, &tmp_list, eh_entry) { |
1624 | if (scmd_id(scmd) != id) | |
1625 | continue; | |
1626 | ||
3eef6257 DJ |
1627 | if (rtn == SUCCESS) |
1628 | list_move_tail(&scmd->eh_entry, &check_list); | |
1629 | else if (rtn == FAST_IO_FAIL) | |
98db5195 JB |
1630 | scsi_eh_finish_cmd(scmd, done_q); |
1631 | else | |
1632 | /* push back on work queue for further processing */ | |
1633 | list_move(&scmd->eh_entry, work_q); | |
1634 | } | |
1635 | } | |
30bd7df8 | 1636 | |
3eef6257 | 1637 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
30bd7df8 MC |
1638 | } |
1639 | ||
1da177e4 | 1640 | /** |
0bf8c869 | 1641 | * scsi_eh_bus_reset - send a bus reset |
eb44820c | 1642 | * @shost: &scsi host being recovered. |
74cf298f | 1643 | * @work_q: &list_head for pending commands. |
eb44820c | 1644 | * @done_q: &list_head for processed commands. |
dc8875e1 | 1645 | */ |
1da177e4 LT |
1646 | static int scsi_eh_bus_reset(struct Scsi_Host *shost, |
1647 | struct list_head *work_q, | |
1648 | struct list_head *done_q) | |
1649 | { | |
937abeaa | 1650 | struct scsi_cmnd *scmd, *chan_scmd, *next; |
3eef6257 | 1651 | LIST_HEAD(check_list); |
1da177e4 | 1652 | unsigned int channel; |
b8e162f9 | 1653 | enum scsi_disposition rtn; |
1da177e4 LT |
1654 | |
1655 | /* | |
1656 | * we really want to loop over the various channels, and do this on | |
1657 | * a channel by channel basis. we should also check to see if any | |
1658 | * of the failed commands are on soft_reset devices, and if so, skip | |
0bf8c869 | 1659 | * the reset. |
1da177e4 LT |
1660 | */ |
1661 | ||
1662 | for (channel = 0; channel <= shost->max_channel; channel++) { | |
b4562022 | 1663 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 HR |
1664 | list_splice_init(&check_list, work_q); |
1665 | SCSI_LOG_ERROR_RECOVERY(3, | |
1666 | shost_printk(KERN_INFO, shost, | |
a222b1e2 HR |
1667 | "%s: skip BRST, past eh deadline\n", |
1668 | current->comm)); | |
b4562022 HR |
1669 | return list_empty(work_q); |
1670 | } | |
b4562022 | 1671 | |
1da177e4 LT |
1672 | chan_scmd = NULL; |
1673 | list_for_each_entry(scmd, work_q, eh_entry) { | |
422c0d61 | 1674 | if (channel == scmd_channel(scmd)) { |
1da177e4 LT |
1675 | chan_scmd = scmd; |
1676 | break; | |
1677 | /* | |
1678 | * FIXME add back in some support for | |
1679 | * soft_reset devices. | |
1680 | */ | |
1681 | } | |
1682 | } | |
1683 | ||
1684 | if (!chan_scmd) | |
1685 | continue; | |
91921e01 HR |
1686 | SCSI_LOG_ERROR_RECOVERY(3, |
1687 | shost_printk(KERN_INFO, shost, | |
1688 | "%s: Sending BRST chan: %d\n", | |
1689 | current->comm, channel)); | |
1da177e4 | 1690 | rtn = scsi_try_bus_reset(chan_scmd); |
2f2eb587 | 1691 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
937abeaa | 1692 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3eef6257 DJ |
1693 | if (channel == scmd_channel(scmd)) { |
1694 | if (rtn == FAST_IO_FAIL) | |
1da177e4 LT |
1695 | scsi_eh_finish_cmd(scmd, |
1696 | done_q); | |
3eef6257 DJ |
1697 | else |
1698 | list_move_tail(&scmd->eh_entry, | |
1699 | &check_list); | |
1700 | } | |
1da177e4 LT |
1701 | } |
1702 | } else { | |
91921e01 HR |
1703 | SCSI_LOG_ERROR_RECOVERY(3, |
1704 | shost_printk(KERN_INFO, shost, | |
1705 | "%s: BRST failed chan: %d\n", | |
1706 | current->comm, channel)); | |
1da177e4 LT |
1707 | } |
1708 | } | |
3eef6257 | 1709 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4 LT |
1710 | } |
1711 | ||
1712 | /** | |
0bf8c869 | 1713 | * scsi_eh_host_reset - send a host reset |
74cf298f RD |
1714 | * @shost: host to be reset. |
1715 | * @work_q: &list_head for pending commands. | |
1716 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1717 | */ |
91921e01 HR |
1718 | static int scsi_eh_host_reset(struct Scsi_Host *shost, |
1719 | struct list_head *work_q, | |
1da177e4 LT |
1720 | struct list_head *done_q) |
1721 | { | |
937abeaa | 1722 | struct scsi_cmnd *scmd, *next; |
3eef6257 | 1723 | LIST_HEAD(check_list); |
b8e162f9 | 1724 | enum scsi_disposition rtn; |
1da177e4 LT |
1725 | |
1726 | if (!list_empty(work_q)) { | |
1727 | scmd = list_entry(work_q->next, | |
1728 | struct scsi_cmnd, eh_entry); | |
1729 | ||
91921e01 HR |
1730 | SCSI_LOG_ERROR_RECOVERY(3, |
1731 | shost_printk(KERN_INFO, shost, | |
1732 | "%s: Sending HRST\n", | |
1733 | current->comm)); | |
1da177e4 LT |
1734 | |
1735 | rtn = scsi_try_host_reset(scmd); | |
3eef6257 DJ |
1736 | if (rtn == SUCCESS) { |
1737 | list_splice_init(work_q, &check_list); | |
1738 | } else if (rtn == FAST_IO_FAIL) { | |
937abeaa | 1739 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1da177e4 LT |
1740 | scsi_eh_finish_cmd(scmd, done_q); |
1741 | } | |
1742 | } else { | |
91921e01 HR |
1743 | SCSI_LOG_ERROR_RECOVERY(3, |
1744 | shost_printk(KERN_INFO, shost, | |
1745 | "%s: HRST failed\n", | |
1746 | current->comm)); | |
1da177e4 LT |
1747 | } |
1748 | } | |
3eef6257 | 1749 | return scsi_eh_test_devices(&check_list, work_q, done_q, 1); |
1da177e4 LT |
1750 | } |
1751 | ||
1752 | /** | |
1753 | * scsi_eh_offline_sdevs - offline scsi devices that fail to recover | |
74cf298f RD |
1754 | * @work_q: &list_head for pending commands. |
1755 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1756 | */ |
1da177e4 LT |
1757 | static void scsi_eh_offline_sdevs(struct list_head *work_q, |
1758 | struct list_head *done_q) | |
1759 | { | |
937abeaa | 1760 | struct scsi_cmnd *scmd, *next; |
0db6ca8a | 1761 | struct scsi_device *sdev; |
1da177e4 | 1762 | |
937abeaa | 1763 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
31765d7d MW |
1764 | sdev_printk(KERN_INFO, scmd->device, "Device offlined - " |
1765 | "not ready after error recovery\n"); | |
0db6ca8a BVA |
1766 | sdev = scmd->device; |
1767 | ||
1768 | mutex_lock(&sdev->state_mutex); | |
1769 | scsi_device_set_state(sdev, SDEV_OFFLINE); | |
1770 | mutex_unlock(&sdev->state_mutex); | |
1771 | ||
1da177e4 LT |
1772 | scsi_eh_finish_cmd(scmd, done_q); |
1773 | } | |
1774 | return; | |
1775 | } | |
1776 | ||
4a27446f | 1777 | /** |
e494f6a7 | 1778 | * scsi_noretry_cmd - determine if command should be failed fast |
4a27446f MC |
1779 | * @scmd: SCSI cmd to examine. |
1780 | */ | |
1781 | int scsi_noretry_cmd(struct scsi_cmnd *scmd) | |
1782 | { | |
aa8e25e5 BVA |
1783 | struct request *req = scsi_cmd_to_rq(scmd); |
1784 | ||
4a27446f MC |
1785 | switch (host_byte(scmd->result)) { |
1786 | case DID_OK: | |
1787 | break; | |
e494f6a7 HR |
1788 | case DID_TIME_OUT: |
1789 | goto check_type; | |
4a27446f | 1790 | case DID_BUS_BUSY: |
aa8e25e5 | 1791 | return req->cmd_flags & REQ_FAILFAST_TRANSPORT; |
4a27446f | 1792 | case DID_PARITY: |
aa8e25e5 | 1793 | return req->cmd_flags & REQ_FAILFAST_DEV; |
4a27446f | 1794 | case DID_ERROR: |
3d45cefc | 1795 | if (get_status_byte(scmd) == SAM_STAT_RESERVATION_CONFLICT) |
4a27446f | 1796 | return 0; |
df561f66 | 1797 | fallthrough; |
4a27446f | 1798 | case DID_SOFT_ERROR: |
aa8e25e5 | 1799 | return req->cmd_flags & REQ_FAILFAST_DRIVER; |
4a27446f MC |
1800 | } |
1801 | ||
d0672a03 | 1802 | if (!scsi_status_is_check_condition(scmd->result)) |
e494f6a7 | 1803 | return 0; |
4a27446f | 1804 | |
e494f6a7 HR |
1805 | check_type: |
1806 | /* | |
1807 | * assume caller has checked sense and determined | |
1808 | * the check condition was retryable. | |
1809 | */ | |
aa8e25e5 | 1810 | if (req->cmd_flags & REQ_FAILFAST_DEV || blk_rq_is_passthrough(req)) |
e494f6a7 | 1811 | return 1; |
342c81ee DLM |
1812 | |
1813 | return 0; | |
4a27446f MC |
1814 | } |
1815 | ||
1da177e4 LT |
1816 | /** |
1817 | * scsi_decide_disposition - Disposition a cmd on return from LLD. | |
1818 | * @scmd: SCSI cmd to examine. | |
1819 | * | |
1820 | * Notes: | |
1821 | * This is *only* called when we are examining the status after sending | |
1822 | * out the actual data command. any commands that are queued for error | |
1823 | * recovery (e.g. test_unit_ready) do *not* come through here. | |
1824 | * | |
1825 | * When this routine returns failed, it means the error handler thread | |
1826 | * is woken. In cases where the error code indicates an error that | |
1827 | * doesn't require the error handler read (i.e. we don't need to | |
1828 | * abort/reset), this function should return SUCCESS. | |
dc8875e1 | 1829 | */ |
b8e162f9 | 1830 | enum scsi_disposition scsi_decide_disposition(struct scsi_cmnd *scmd) |
1da177e4 | 1831 | { |
b8e162f9 | 1832 | enum scsi_disposition rtn; |
1da177e4 LT |
1833 | |
1834 | /* | |
1835 | * if the device is offline, then we clearly just pass the result back | |
1836 | * up to the top level. | |
1837 | */ | |
1838 | if (!scsi_device_online(scmd->device)) { | |
91921e01 HR |
1839 | SCSI_LOG_ERROR_RECOVERY(5, scmd_printk(KERN_INFO, scmd, |
1840 | "%s: device offline - report as SUCCESS\n", __func__)); | |
1da177e4 LT |
1841 | return SUCCESS; |
1842 | } | |
1843 | ||
1844 | /* | |
1845 | * first check the host byte, to see if there is anything in there | |
1846 | * that would indicate what we need to do. | |
1847 | */ | |
1848 | switch (host_byte(scmd->result)) { | |
1849 | case DID_PASSTHROUGH: | |
1850 | /* | |
1851 | * no matter what, pass this through to the upper layer. | |
1852 | * nuke this special code so that it looks like we are saying | |
1853 | * did_ok. | |
1854 | */ | |
1855 | scmd->result &= 0xff00ffff; | |
1856 | return SUCCESS; | |
1857 | case DID_OK: | |
1858 | /* | |
1859 | * looks good. drop through, and check the next byte. | |
1860 | */ | |
1861 | break; | |
e494f6a7 HR |
1862 | case DID_ABORT: |
1863 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) { | |
8922a908 | 1864 | set_host_byte(scmd, DID_TIME_OUT); |
e494f6a7 HR |
1865 | return SUCCESS; |
1866 | } | |
df561f66 | 1867 | fallthrough; |
1da177e4 LT |
1868 | case DID_NO_CONNECT: |
1869 | case DID_BAD_TARGET: | |
1da177e4 LT |
1870 | /* |
1871 | * note - this means that we just report the status back | |
1872 | * to the top level driver, not that we actually think | |
1873 | * that it indicates SUCCESS. | |
1874 | */ | |
1875 | return SUCCESS; | |
ad95028a | 1876 | case DID_SOFT_ERROR: |
1da177e4 LT |
1877 | /* |
1878 | * when the low level driver returns did_soft_error, | |
0bf8c869 | 1879 | * it is responsible for keeping an internal retry counter |
1da177e4 | 1880 | * in order to avoid endless loops (db) |
1da177e4 | 1881 | */ |
1da177e4 LT |
1882 | goto maybe_retry; |
1883 | case DID_IMM_RETRY: | |
1884 | return NEEDS_RETRY; | |
1885 | ||
bf341919 JB |
1886 | case DID_REQUEUE: |
1887 | return ADD_TO_MLQUEUE; | |
a4dfaa6f MC |
1888 | case DID_TRANSPORT_DISRUPTED: |
1889 | /* | |
1890 | * LLD/transport was disrupted during processing of the IO. | |
1891 | * The transport class is now blocked/blocking, | |
1892 | * and the transport will decide what to do with the IO | |
939c2288 MC |
1893 | * based on its timers and recovery capablilities if |
1894 | * there are enough retries. | |
a4dfaa6f | 1895 | */ |
939c2288 | 1896 | goto maybe_retry; |
a4dfaa6f MC |
1897 | case DID_TRANSPORT_FAILFAST: |
1898 | /* | |
1899 | * The transport decided to failfast the IO (most likely | |
1900 | * the fast io fail tmo fired), so send IO directly upwards. | |
1901 | */ | |
1902 | return SUCCESS; | |
962c8dcd MK |
1903 | case DID_TRANSPORT_MARGINAL: |
1904 | /* | |
1905 | * caller has decided not to do retries on | |
1906 | * abort success, so send IO directly upwards | |
1907 | */ | |
1908 | return SUCCESS; | |
1da177e4 | 1909 | case DID_ERROR: |
3d45cefc | 1910 | if (get_status_byte(scmd) == SAM_STAT_RESERVATION_CONFLICT) |
1da177e4 LT |
1911 | /* |
1912 | * execute reservation conflict processing code | |
1913 | * lower down | |
1914 | */ | |
1915 | break; | |
df561f66 | 1916 | fallthrough; |
1da177e4 LT |
1917 | case DID_BUS_BUSY: |
1918 | case DID_PARITY: | |
1919 | goto maybe_retry; | |
1920 | case DID_TIME_OUT: | |
1921 | /* | |
1922 | * when we scan the bus, we get timeout messages for | |
1923 | * these commands if there is no device available. | |
1924 | * other hosts report did_no_connect for the same thing. | |
1925 | */ | |
1926 | if ((scmd->cmnd[0] == TEST_UNIT_READY || | |
1927 | scmd->cmnd[0] == INQUIRY)) { | |
1928 | return SUCCESS; | |
1929 | } else { | |
1930 | return FAILED; | |
1931 | } | |
1932 | case DID_RESET: | |
1933 | return SUCCESS; | |
1934 | default: | |
1935 | return FAILED; | |
1936 | } | |
1937 | ||
1da177e4 LT |
1938 | /* |
1939 | * check the status byte to see if this indicates anything special. | |
1940 | */ | |
3d45cefc HR |
1941 | switch (get_status_byte(scmd)) { |
1942 | case SAM_STAT_TASK_SET_FULL: | |
42a6a918 | 1943 | scsi_handle_queue_full(scmd->device); |
1da177e4 LT |
1944 | /* |
1945 | * the case of trying to send too many commands to a | |
1946 | * tagged queueing device. | |
1947 | */ | |
df561f66 | 1948 | fallthrough; |
3d45cefc | 1949 | case SAM_STAT_BUSY: |
1da177e4 LT |
1950 | /* |
1951 | * device can't talk to us at the moment. Should only | |
1952 | * occur (SAM-3) when the task queue is empty, so will cause | |
1953 | * the empty queue handling to trigger a stall in the | |
1954 | * device. | |
1955 | */ | |
1956 | return ADD_TO_MLQUEUE; | |
3d45cefc | 1957 | case SAM_STAT_GOOD: |
279afdfe EM |
1958 | if (scmd->cmnd[0] == REPORT_LUNS) |
1959 | scmd->device->sdev_target->expecting_lun_change = 0; | |
4a84067d | 1960 | scsi_handle_queue_ramp_up(scmd->device); |
df561f66 | 1961 | fallthrough; |
3d45cefc | 1962 | case SAM_STAT_COMMAND_TERMINATED: |
1da177e4 | 1963 | return SUCCESS; |
3d45cefc | 1964 | case SAM_STAT_TASK_ABORTED: |
a9b589d9 | 1965 | goto maybe_retry; |
3d45cefc | 1966 | case SAM_STAT_CHECK_CONDITION: |
1da177e4 LT |
1967 | rtn = scsi_check_sense(scmd); |
1968 | if (rtn == NEEDS_RETRY) | |
1969 | goto maybe_retry; | |
1970 | /* if rtn == FAILED, we have no sense information; | |
1971 | * returning FAILED will wake the error handler thread | |
1972 | * to collect the sense and redo the decide | |
1973 | * disposition */ | |
1974 | return rtn; | |
3d45cefc HR |
1975 | case SAM_STAT_CONDITION_MET: |
1976 | case SAM_STAT_INTERMEDIATE: | |
1977 | case SAM_STAT_INTERMEDIATE_CONDITION_MET: | |
1978 | case SAM_STAT_ACA_ACTIVE: | |
1da177e4 LT |
1979 | /* |
1980 | * who knows? FIXME(eric) | |
1981 | */ | |
1982 | return SUCCESS; | |
1983 | ||
3d45cefc | 1984 | case SAM_STAT_RESERVATION_CONFLICT: |
9ccfc756 JB |
1985 | sdev_printk(KERN_INFO, scmd->device, |
1986 | "reservation conflict\n"); | |
2082ebc4 | 1987 | set_host_byte(scmd, DID_NEXUS_FAILURE); |
1da177e4 LT |
1988 | return SUCCESS; /* causes immediate i/o error */ |
1989 | default: | |
1990 | return FAILED; | |
1991 | } | |
1992 | return FAILED; | |
1993 | ||
8ef7fe4b | 1994 | maybe_retry: |
1da177e4 LT |
1995 | |
1996 | /* we requeue for retry because the error was retryable, and | |
1997 | * the request was not marked fast fail. Note that above, | |
1998 | * even if the request is marked fast fail, we still requeue | |
1999 | * for queue congestion conditions (QUEUE_FULL or BUSY) */ | |
2a242d59 | 2000 | if (scsi_cmd_retry_allowed(scmd) && !scsi_noretry_cmd(scmd)) { |
1da177e4 LT |
2001 | return NEEDS_RETRY; |
2002 | } else { | |
2003 | /* | |
2004 | * no more retries - report this one back to upper level. | |
2005 | */ | |
2006 | return SUCCESS; | |
2007 | } | |
2008 | } | |
2009 | ||
2a842aca | 2010 | static void eh_lock_door_done(struct request *req, blk_status_t status) |
f078727b | 2011 | { |
92bc5a24 | 2012 | blk_put_request(req); |
f078727b FT |
2013 | } |
2014 | ||
1da177e4 LT |
2015 | /** |
2016 | * scsi_eh_lock_door - Prevent medium removal for the specified device | |
2017 | * @sdev: SCSI device to prevent medium removal | |
2018 | * | |
2019 | * Locking: | |
91bc31fb | 2020 | * We must be called from process context. |
1da177e4 LT |
2021 | * |
2022 | * Notes: | |
2023 | * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the | |
2024 | * head of the devices request queue, and continue. | |
dc8875e1 | 2025 | */ |
1da177e4 LT |
2026 | static void scsi_eh_lock_door(struct scsi_device *sdev) |
2027 | { | |
f078727b | 2028 | struct request *req; |
82ed4db4 | 2029 | struct scsi_request *rq; |
1da177e4 | 2030 | |
da6269da | 2031 | req = blk_get_request(sdev->request_queue, REQ_OP_DRV_IN, 0); |
a492f075 | 2032 | if (IS_ERR(req)) |
eb571eea | 2033 | return; |
82ed4db4 | 2034 | rq = scsi_req(req); |
1da177e4 | 2035 | |
82ed4db4 CH |
2036 | rq->cmd[0] = ALLOW_MEDIUM_REMOVAL; |
2037 | rq->cmd[1] = 0; | |
2038 | rq->cmd[2] = 0; | |
2039 | rq->cmd[3] = 0; | |
2040 | rq->cmd[4] = SCSI_REMOVAL_PREVENT; | |
2041 | rq->cmd[5] = 0; | |
2042 | rq->cmd_len = COMMAND_SIZE(rq->cmd[0]); | |
f078727b | 2043 | |
e8064021 | 2044 | req->rq_flags |= RQF_QUIET; |
f078727b | 2045 | req->timeout = 10 * HZ; |
64c7f1d1 | 2046 | rq->retries = 5; |
f078727b | 2047 | |
8eeed0b5 | 2048 | blk_execute_rq_nowait(NULL, req, 1, eh_lock_door_done); |
f078727b | 2049 | } |
1da177e4 LT |
2050 | |
2051 | /** | |
2052 | * scsi_restart_operations - restart io operations to the specified host. | |
2053 | * @shost: Host we are restarting. | |
2054 | * | |
2055 | * Notes: | |
2056 | * When we entered the error handler, we blocked all further i/o to | |
2057 | * this device. we need to 'reverse' this process. | |
dc8875e1 | 2058 | */ |
1da177e4 LT |
2059 | static void scsi_restart_operations(struct Scsi_Host *shost) |
2060 | { | |
2061 | struct scsi_device *sdev; | |
939647ee | 2062 | unsigned long flags; |
1da177e4 LT |
2063 | |
2064 | /* | |
2065 | * If the door was locked, we need to insert a door lock request | |
2066 | * onto the head of the SCSI request queue for the device. There | |
2067 | * is no point trying to lock the door of an off-line device. | |
2068 | */ | |
2069 | shost_for_each_device(sdev, shost) { | |
48379270 | 2070 | if (scsi_device_online(sdev) && sdev->was_reset && sdev->locked) { |
1da177e4 | 2071 | scsi_eh_lock_door(sdev); |
48379270 CH |
2072 | sdev->was_reset = 0; |
2073 | } | |
1da177e4 LT |
2074 | } |
2075 | ||
2076 | /* | |
2077 | * next free up anything directly waiting upon the host. this | |
2078 | * will be requests for character device operations, and also for | |
2079 | * ioctls to queued block devices. | |
2080 | */ | |
b4562022 | 2081 | SCSI_LOG_ERROR_RECOVERY(3, |
91921e01 | 2082 | shost_printk(KERN_INFO, shost, "waking up host to restart\n")); |
1da177e4 | 2083 | |
939647ee JB |
2084 | spin_lock_irqsave(shost->host_lock, flags); |
2085 | if (scsi_host_set_state(shost, SHOST_RUNNING)) | |
2086 | if (scsi_host_set_state(shost, SHOST_CANCEL)) | |
2087 | BUG_ON(scsi_host_set_state(shost, SHOST_DEL)); | |
2088 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
2089 | |
2090 | wake_up(&shost->host_wait); | |
2091 | ||
2092 | /* | |
2093 | * finally we need to re-initiate requests that may be pending. we will | |
2094 | * have had everything blocked while error handling is taking place, and | |
2095 | * now that error recovery is done, we will need to ensure that these | |
2096 | * requests are started. | |
2097 | */ | |
2098 | scsi_run_host_queues(shost); | |
57fc2e33 DW |
2099 | |
2100 | /* | |
2101 | * if eh is active and host_eh_scheduled is pending we need to re-run | |
2102 | * recovery. we do this check after scsi_run_host_queues() to allow | |
2103 | * everything pent up since the last eh run a chance to make forward | |
2104 | * progress before we sync again. Either we'll immediately re-run | |
2105 | * recovery or scsi_device_unbusy() will wake us again when these | |
2106 | * pending commands complete. | |
2107 | */ | |
2108 | spin_lock_irqsave(shost->host_lock, flags); | |
2109 | if (shost->host_eh_scheduled) | |
2110 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) | |
2111 | WARN_ON(scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)); | |
2112 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
2113 | } |
2114 | ||
2115 | /** | |
2116 | * scsi_eh_ready_devs - check device ready state and recover if not. | |
74cf298f RD |
2117 | * @shost: host to be recovered. |
2118 | * @work_q: &list_head for pending commands. | |
eb44820c | 2119 | * @done_q: &list_head for processed commands. |
dc8875e1 | 2120 | */ |
dca84e46 DW |
2121 | void scsi_eh_ready_devs(struct Scsi_Host *shost, |
2122 | struct list_head *work_q, | |
2123 | struct list_head *done_q) | |
1da177e4 LT |
2124 | { |
2125 | if (!scsi_eh_stu(shost, work_q, done_q)) | |
2126 | if (!scsi_eh_bus_device_reset(shost, work_q, done_q)) | |
30bd7df8 MC |
2127 | if (!scsi_eh_target_reset(shost, work_q, done_q)) |
2128 | if (!scsi_eh_bus_reset(shost, work_q, done_q)) | |
91921e01 | 2129 | if (!scsi_eh_host_reset(shost, work_q, done_q)) |
30bd7df8 MC |
2130 | scsi_eh_offline_sdevs(work_q, |
2131 | done_q); | |
1da177e4 | 2132 | } |
dca84e46 | 2133 | EXPORT_SYMBOL_GPL(scsi_eh_ready_devs); |
1da177e4 LT |
2134 | |
2135 | /** | |
2136 | * scsi_eh_flush_done_q - finish processed commands or retry them. | |
2137 | * @done_q: list_head of processed commands. | |
dc8875e1 | 2138 | */ |
041c5fc3 | 2139 | void scsi_eh_flush_done_q(struct list_head *done_q) |
1da177e4 | 2140 | { |
937abeaa | 2141 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 2142 | |
937abeaa CH |
2143 | list_for_each_entry_safe(scmd, next, done_q, eh_entry) { |
2144 | list_del_init(&scmd->eh_entry); | |
1da177e4 | 2145 | if (scsi_device_online(scmd->device) && |
60bee27b MK |
2146 | !scsi_noretry_cmd(scmd) && scsi_cmd_retry_allowed(scmd) && |
2147 | scsi_eh_should_retry_cmd(scmd)) { | |
91921e01 HR |
2148 | SCSI_LOG_ERROR_RECOVERY(3, |
2149 | scmd_printk(KERN_INFO, scmd, | |
470613b4 HR |
2150 | "%s: flush retry cmd\n", |
2151 | current->comm)); | |
1da177e4 LT |
2152 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); |
2153 | } else { | |
793698ce PM |
2154 | /* |
2155 | * If just we got sense for the device (called | |
2156 | * scsi_eh_get_sense), scmd->result is already | |
4bd51e54 | 2157 | * set, do not set DID_TIME_OUT. |
793698ce | 2158 | */ |
1da177e4 | 2159 | if (!scmd->result) |
4bd51e54 | 2160 | scmd->result |= (DID_TIME_OUT << 16); |
91921e01 HR |
2161 | SCSI_LOG_ERROR_RECOVERY(3, |
2162 | scmd_printk(KERN_INFO, scmd, | |
470613b4 HR |
2163 | "%s: flush finish cmd\n", |
2164 | current->comm)); | |
1da177e4 LT |
2165 | scsi_finish_command(scmd); |
2166 | } | |
2167 | } | |
2168 | } | |
041c5fc3 | 2169 | EXPORT_SYMBOL(scsi_eh_flush_done_q); |
1da177e4 LT |
2170 | |
2171 | /** | |
2172 | * scsi_unjam_host - Attempt to fix a host which has a cmd that failed. | |
2173 | * @shost: Host to unjam. | |
2174 | * | |
2175 | * Notes: | |
2176 | * When we come in here, we *know* that all commands on the bus have | |
2177 | * either completed, failed or timed out. we also know that no further | |
2178 | * commands are being sent to the host, so things are relatively quiet | |
2179 | * and we have freedom to fiddle with things as we wish. | |
2180 | * | |
2181 | * This is only the *default* implementation. it is possible for | |
2182 | * individual drivers to supply their own version of this function, and | |
2183 | * if the maintainer wishes to do this, it is strongly suggested that | |
2184 | * this function be taken as a template and modified. this function | |
2185 | * was designed to correctly handle problems for about 95% of the | |
2186 | * different cases out there, and it should always provide at least a | |
2187 | * reasonable amount of error recovery. | |
2188 | * | |
2189 | * Any command marked 'failed' or 'timeout' must eventually have | |
2190 | * scsi_finish_cmd() called for it. we do all of the retry stuff | |
2191 | * here, so when we restart the host after we return it should have an | |
2192 | * empty queue. | |
dc8875e1 | 2193 | */ |
1da177e4 LT |
2194 | static void scsi_unjam_host(struct Scsi_Host *shost) |
2195 | { | |
2196 | unsigned long flags; | |
2197 | LIST_HEAD(eh_work_q); | |
2198 | LIST_HEAD(eh_done_q); | |
2199 | ||
2200 | spin_lock_irqsave(shost->host_lock, flags); | |
2201 | list_splice_init(&shost->eh_cmd_q, &eh_work_q); | |
2202 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2203 | ||
2204 | SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost, &eh_work_q)); | |
2205 | ||
2206 | if (!scsi_eh_get_sense(&eh_work_q, &eh_done_q)) | |
a0658632 | 2207 | scsi_eh_ready_devs(shost, &eh_work_q, &eh_done_q); |
1da177e4 | 2208 | |
b4562022 | 2209 | spin_lock_irqsave(shost->host_lock, flags); |
bb3b621a | 2210 | if (shost->eh_deadline != -1) |
b4562022 HR |
2211 | shost->last_reset = 0; |
2212 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
2213 | scsi_eh_flush_done_q(&eh_done_q); |
2214 | } | |
2215 | ||
2216 | /** | |
ad42eb1b | 2217 | * scsi_error_handler - SCSI error handler thread |
1da177e4 LT |
2218 | * @data: Host for which we are running. |
2219 | * | |
2220 | * Notes: | |
ad42eb1b CH |
2221 | * This is the main error handling loop. This is run as a kernel thread |
2222 | * for every SCSI host and handles all error handling activity. | |
dc8875e1 | 2223 | */ |
1da177e4 LT |
2224 | int scsi_error_handler(void *data) |
2225 | { | |
ad42eb1b | 2226 | struct Scsi_Host *shost = data; |
1da177e4 | 2227 | |
1da177e4 | 2228 | /* |
ad42eb1b CH |
2229 | * We use TASK_INTERRUPTIBLE so that the thread is not |
2230 | * counted against the load average as a running process. | |
2231 | * We never actually get interrupted because kthread_run | |
c03264a7 | 2232 | * disables signal delivery for the created thread. |
1da177e4 | 2233 | */ |
537b604c MH |
2234 | while (true) { |
2235 | /* | |
2236 | * The sequence in kthread_stop() sets the stop flag first | |
2237 | * then wakes the process. To avoid missed wakeups, the task | |
2238 | * should always be in a non running state before the stop | |
2239 | * flag is checked | |
2240 | */ | |
b9d5c6b7 | 2241 | set_current_state(TASK_INTERRUPTIBLE); |
537b604c MH |
2242 | if (kthread_should_stop()) |
2243 | break; | |
2244 | ||
ee7863bc | 2245 | if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) || |
c84b023a | 2246 | shost->host_failed != scsi_host_busy(shost)) { |
ad42eb1b | 2247 | SCSI_LOG_ERROR_RECOVERY(1, |
91921e01 HR |
2248 | shost_printk(KERN_INFO, shost, |
2249 | "scsi_eh_%d: sleeping\n", | |
2250 | shost->host_no)); | |
3ed7a470 | 2251 | schedule(); |
3ed7a470 JB |
2252 | continue; |
2253 | } | |
1da177e4 | 2254 | |
3ed7a470 | 2255 | __set_current_state(TASK_RUNNING); |
ad42eb1b | 2256 | SCSI_LOG_ERROR_RECOVERY(1, |
91921e01 HR |
2257 | shost_printk(KERN_INFO, shost, |
2258 | "scsi_eh_%d: waking up %d/%d/%d\n", | |
2259 | shost->host_no, shost->host_eh_scheduled, | |
74665016 | 2260 | shost->host_failed, |
c84b023a | 2261 | scsi_host_busy(shost))); |
1da177e4 | 2262 | |
1da177e4 LT |
2263 | /* |
2264 | * We have a host that is failing for some reason. Figure out | |
2265 | * what we need to do to get it up and online again (if we can). | |
2266 | * If we fail, we end up taking the thing offline. | |
2267 | */ | |
ae0751ff | 2268 | if (!shost->eh_noresume && scsi_autopm_get_host(shost) != 0) { |
bc4f2401 | 2269 | SCSI_LOG_ERROR_RECOVERY(1, |
a222b1e2 HR |
2270 | shost_printk(KERN_ERR, shost, |
2271 | "scsi_eh_%d: unable to autoresume\n", | |
2272 | shost->host_no)); | |
bc4f2401 AS |
2273 | continue; |
2274 | } | |
2275 | ||
9227c33d CH |
2276 | if (shost->transportt->eh_strategy_handler) |
2277 | shost->transportt->eh_strategy_handler(shost); | |
1da177e4 LT |
2278 | else |
2279 | scsi_unjam_host(shost); | |
2280 | ||
72d8c36e WF |
2281 | /* All scmds have been handled */ |
2282 | shost->host_failed = 0; | |
2283 | ||
1da177e4 LT |
2284 | /* |
2285 | * Note - if the above fails completely, the action is to take | |
2286 | * individual devices offline and flush the queue of any | |
2287 | * outstanding requests that may have been pending. When we | |
2288 | * restart, we restart any I/O to any other devices on the bus | |
2289 | * which are still online. | |
2290 | */ | |
2291 | scsi_restart_operations(shost); | |
ae0751ff LM |
2292 | if (!shost->eh_noresume) |
2293 | scsi_autopm_put_host(shost); | |
1da177e4 | 2294 | } |
461a0ffb SR |
2295 | __set_current_state(TASK_RUNNING); |
2296 | ||
ad42eb1b | 2297 | SCSI_LOG_ERROR_RECOVERY(1, |
91921e01 HR |
2298 | shost_printk(KERN_INFO, shost, |
2299 | "Error handler scsi_eh_%d exiting\n", | |
2300 | shost->host_no)); | |
3ed7a470 | 2301 | shost->ehandler = NULL; |
1da177e4 LT |
2302 | return 0; |
2303 | } | |
2304 | ||
2305 | /* | |
2306 | * Function: scsi_report_bus_reset() | |
2307 | * | |
2308 | * Purpose: Utility function used by low-level drivers to report that | |
2309 | * they have observed a bus reset on the bus being handled. | |
2310 | * | |
2311 | * Arguments: shost - Host in question | |
2312 | * channel - channel on which reset was observed. | |
2313 | * | |
2314 | * Returns: Nothing | |
2315 | * | |
2316 | * Lock status: Host lock must be held. | |
2317 | * | |
2318 | * Notes: This only needs to be called if the reset is one which | |
2319 | * originates from an unknown location. Resets originated | |
2320 | * by the mid-level itself don't need to call this, but there | |
2321 | * should be no harm. | |
2322 | * | |
2323 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
2324 | * is properly treated. | |
2325 | */ | |
2326 | void scsi_report_bus_reset(struct Scsi_Host *shost, int channel) | |
2327 | { | |
2328 | struct scsi_device *sdev; | |
2329 | ||
2330 | __shost_for_each_device(sdev, shost) { | |
30bd7df8 MC |
2331 | if (channel == sdev_channel(sdev)) |
2332 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
2333 | } |
2334 | } | |
2335 | EXPORT_SYMBOL(scsi_report_bus_reset); | |
2336 | ||
2337 | /* | |
2338 | * Function: scsi_report_device_reset() | |
2339 | * | |
2340 | * Purpose: Utility function used by low-level drivers to report that | |
2341 | * they have observed a device reset on the device being handled. | |
2342 | * | |
2343 | * Arguments: shost - Host in question | |
2344 | * channel - channel on which reset was observed | |
2345 | * target - target on which reset was observed | |
2346 | * | |
2347 | * Returns: Nothing | |
2348 | * | |
2349 | * Lock status: Host lock must be held | |
2350 | * | |
2351 | * Notes: This only needs to be called if the reset is one which | |
2352 | * originates from an unknown location. Resets originated | |
2353 | * by the mid-level itself don't need to call this, but there | |
2354 | * should be no harm. | |
2355 | * | |
2356 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
2357 | * is properly treated. | |
2358 | */ | |
2359 | void scsi_report_device_reset(struct Scsi_Host *shost, int channel, int target) | |
2360 | { | |
2361 | struct scsi_device *sdev; | |
2362 | ||
2363 | __shost_for_each_device(sdev, shost) { | |
422c0d61 | 2364 | if (channel == sdev_channel(sdev) && |
30bd7df8 MC |
2365 | target == sdev_id(sdev)) |
2366 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
2367 | } |
2368 | } | |
2369 | EXPORT_SYMBOL(scsi_report_device_reset); | |
2370 | ||
2371 | static void | |
2372 | scsi_reset_provider_done_command(struct scsi_cmnd *scmd) | |
2373 | { | |
2374 | } | |
2375 | ||
176aa9d6 CH |
2376 | /** |
2377 | * scsi_ioctl_reset: explicitly reset a host/bus/target/device | |
2378 | * @dev: scsi_device to operate on | |
2379 | * @arg: reset type (see sg.h) | |
1da177e4 LT |
2380 | */ |
2381 | int | |
176aa9d6 | 2382 | scsi_ioctl_reset(struct scsi_device *dev, int __user *arg) |
1da177e4 | 2383 | { |
bc4f2401 | 2384 | struct scsi_cmnd *scmd; |
d7a1bb0a | 2385 | struct Scsi_Host *shost = dev->host; |
e9c787e6 | 2386 | struct request *rq; |
d7a1bb0a | 2387 | unsigned long flags; |
b8e162f9 BVA |
2388 | int error = 0, val; |
2389 | enum scsi_disposition rtn; | |
176aa9d6 CH |
2390 | |
2391 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2392 | return -EACCES; | |
2393 | ||
2394 | error = get_user(val, arg); | |
2395 | if (error) | |
2396 | return error; | |
1da177e4 | 2397 | |
bc4f2401 | 2398 | if (scsi_autopm_get_host(shost) < 0) |
176aa9d6 | 2399 | return -EIO; |
bc4f2401 | 2400 | |
176aa9d6 | 2401 | error = -EIO; |
e9c787e6 CH |
2402 | rq = kzalloc(sizeof(struct request) + sizeof(struct scsi_cmnd) + |
2403 | shost->hostt->cmd_size, GFP_KERNEL); | |
2404 | if (!rq) | |
95eeb5f5 | 2405 | goto out_put_autopm_host; |
e9c787e6 | 2406 | blk_rq_init(NULL, rq); |
95eeb5f5 | 2407 | |
e9c787e6 CH |
2408 | scmd = (struct scsi_cmnd *)(rq + 1); |
2409 | scsi_init_command(dev, scmd); | |
82ed4db4 | 2410 | scmd->cmnd = scsi_req(rq)->cmd; |
64a87b24 | 2411 | |
1da177e4 | 2412 | scmd->scsi_done = scsi_reset_provider_done_command; |
30b0c37b | 2413 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
1da177e4 LT |
2414 | |
2415 | scmd->cmd_len = 0; | |
2416 | ||
2417 | scmd->sc_data_direction = DMA_BIDIRECTIONAL; | |
1da177e4 | 2418 | |
d7a1bb0a JS |
2419 | spin_lock_irqsave(shost->host_lock, flags); |
2420 | shost->tmf_in_progress = 1; | |
2421 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2422 | ||
176aa9d6 CH |
2423 | switch (val & ~SG_SCSI_RESET_NO_ESCALATE) { |
2424 | case SG_SCSI_RESET_NOTHING: | |
2425 | rtn = SUCCESS; | |
2426 | break; | |
2427 | case SG_SCSI_RESET_DEVICE: | |
1da177e4 | 2428 | rtn = scsi_try_bus_device_reset(scmd); |
176aa9d6 | 2429 | if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE)) |
1da177e4 | 2430 | break; |
df561f66 | 2431 | fallthrough; |
176aa9d6 | 2432 | case SG_SCSI_RESET_TARGET: |
30bd7df8 | 2433 | rtn = scsi_try_target_reset(scmd); |
176aa9d6 | 2434 | if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE)) |
30bd7df8 | 2435 | break; |
df561f66 | 2436 | fallthrough; |
176aa9d6 | 2437 | case SG_SCSI_RESET_BUS: |
1da177e4 | 2438 | rtn = scsi_try_bus_reset(scmd); |
176aa9d6 | 2439 | if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE)) |
1da177e4 | 2440 | break; |
df561f66 | 2441 | fallthrough; |
176aa9d6 | 2442 | case SG_SCSI_RESET_HOST: |
1da177e4 | 2443 | rtn = scsi_try_host_reset(scmd); |
176aa9d6 CH |
2444 | if (rtn == SUCCESS) |
2445 | break; | |
df561f66 | 2446 | fallthrough; |
3bf2ff67 | 2447 | default: |
1da177e4 | 2448 | rtn = FAILED; |
176aa9d6 | 2449 | break; |
1da177e4 LT |
2450 | } |
2451 | ||
176aa9d6 CH |
2452 | error = (rtn == SUCCESS) ? 0 : -EIO; |
2453 | ||
d7a1bb0a JS |
2454 | spin_lock_irqsave(shost->host_lock, flags); |
2455 | shost->tmf_in_progress = 0; | |
2456 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2457 | ||
2458 | /* | |
2459 | * be sure to wake up anyone who was sleeping or had their queue | |
2460 | * suspended while we performed the TMF. | |
2461 | */ | |
2462 | SCSI_LOG_ERROR_RECOVERY(3, | |
91921e01 HR |
2463 | shost_printk(KERN_INFO, shost, |
2464 | "waking up host to restart after TMF\n")); | |
d7a1bb0a JS |
2465 | |
2466 | wake_up(&shost->host_wait); | |
d7a1bb0a JS |
2467 | scsi_run_host_queues(shost); |
2468 | ||
e9c787e6 | 2469 | kfree(rq); |
0f121dd8 | 2470 | |
04796336 | 2471 | out_put_autopm_host: |
bc4f2401 | 2472 | scsi_autopm_put_host(shost); |
176aa9d6 | 2473 | return error; |
1da177e4 | 2474 | } |
1da177e4 | 2475 | |
4753cbc0 HR |
2476 | bool scsi_command_normalize_sense(const struct scsi_cmnd *cmd, |
2477 | struct scsi_sense_hdr *sshdr) | |
1da177e4 LT |
2478 | { |
2479 | return scsi_normalize_sense(cmd->sense_buffer, | |
b80ca4f7 | 2480 | SCSI_SENSE_BUFFERSIZE, sshdr); |
1da177e4 LT |
2481 | } |
2482 | EXPORT_SYMBOL(scsi_command_normalize_sense); | |
2483 | ||
1da177e4 | 2484 | /** |
eb44820c | 2485 | * scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor format) |
1da177e4 LT |
2486 | * @sense_buffer: byte array of sense data |
2487 | * @sb_len: number of valid bytes in sense_buffer | |
2488 | * @info_out: pointer to 64 integer where 8 or 4 byte information | |
2489 | * field will be placed if found. | |
2490 | * | |
2491 | * Return value: | |
2908769c | 2492 | * true if information field found, false if not found. |
dc8875e1 | 2493 | */ |
2908769c DLM |
2494 | bool scsi_get_sense_info_fld(const u8 *sense_buffer, int sb_len, |
2495 | u64 *info_out) | |
1da177e4 | 2496 | { |
1da177e4 | 2497 | const u8 * ucp; |
1da177e4 LT |
2498 | |
2499 | if (sb_len < 7) | |
2908769c | 2500 | return false; |
1da177e4 LT |
2501 | switch (sense_buffer[0] & 0x7f) { |
2502 | case 0x70: | |
2503 | case 0x71: | |
2504 | if (sense_buffer[0] & 0x80) { | |
2908769c DLM |
2505 | *info_out = get_unaligned_be32(&sense_buffer[3]); |
2506 | return true; | |
2507 | } | |
2508 | return false; | |
1da177e4 LT |
2509 | case 0x72: |
2510 | case 0x73: | |
2511 | ucp = scsi_sense_desc_find(sense_buffer, sb_len, | |
2512 | 0 /* info desc */); | |
2513 | if (ucp && (0xa == ucp[1])) { | |
2908769c DLM |
2514 | *info_out = get_unaligned_be64(&ucp[4]); |
2515 | return true; | |
2516 | } | |
2517 | return false; | |
1da177e4 | 2518 | default: |
2908769c | 2519 | return false; |
1da177e4 LT |
2520 | } |
2521 | } | |
2522 | EXPORT_SYMBOL(scsi_get_sense_info_fld); |