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1da177e4 LT |
1 | /* |
2 | * scsi_error.c Copyright (C) 1997 Eric Youngdale | |
3 | * | |
4 | * SCSI error/timeout handling | |
5 | * Initial versions: Eric Youngdale. Based upon conversations with | |
0bf8c869 | 6 | * Leonard Zubkoff and David Miller at Linux Expo, |
1da177e4 LT |
7 | * ideas originating from all over the place. |
8 | * | |
9 | * Restructured scsi_unjam_host and associated functions. | |
10 | * September 04, 2002 Mike Anderson (andmike@us.ibm.com) | |
11 | * | |
12 | * Forward port of Russell King's (rmk@arm.linux.org.uk) changes and | |
0bf8c869 | 13 | * minor cleanups. |
1da177e4 LT |
14 | * September 30, 2002 Mike Anderson (andmike@us.ibm.com) |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/sched.h> | |
5a0e3ad6 | 19 | #include <linux/gfp.h> |
1da177e4 LT |
20 | #include <linux/timer.h> |
21 | #include <linux/string.h> | |
1da177e4 | 22 | #include <linux/kernel.h> |
83144186 | 23 | #include <linux/freezer.h> |
c5478def | 24 | #include <linux/kthread.h> |
1da177e4 LT |
25 | #include <linux/interrupt.h> |
26 | #include <linux/blkdev.h> | |
27 | #include <linux/delay.h> | |
fc73648a | 28 | #include <linux/jiffies.h> |
1da177e4 LT |
29 | |
30 | #include <scsi/scsi.h> | |
beb40487 | 31 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
32 | #include <scsi/scsi_dbg.h> |
33 | #include <scsi/scsi_device.h> | |
18a4d0a2 | 34 | #include <scsi/scsi_driver.h> |
1da177e4 | 35 | #include <scsi/scsi_eh.h> |
7708c165 | 36 | #include <scsi/scsi_common.h> |
c829c394 | 37 | #include <scsi/scsi_transport.h> |
1da177e4 LT |
38 | #include <scsi/scsi_host.h> |
39 | #include <scsi/scsi_ioctl.h> | |
ee14c674 | 40 | #include <scsi/scsi_dh.h> |
29cfc2ab | 41 | #include <scsi/scsi_devinfo.h> |
176aa9d6 | 42 | #include <scsi/sg.h> |
1da177e4 LT |
43 | |
44 | #include "scsi_priv.h" | |
45 | #include "scsi_logging.h" | |
79ee8304 | 46 | #include "scsi_transport_api.h" |
1da177e4 | 47 | |
bf816235 KT |
48 | #include <trace/events/scsi.h> |
49 | ||
2908769c DLM |
50 | #include <asm/unaligned.h> |
51 | ||
14216561 JB |
52 | static void scsi_eh_done(struct scsi_cmnd *scmd); |
53 | ||
1da177e4 LT |
54 | /* |
55 | * These should *probably* be handled by the host itself. | |
56 | * Since it is allowed to sleep, it probably should. | |
57 | */ | |
58 | #define BUS_RESET_SETTLE_TIME (10) | |
59 | #define HOST_RESET_SETTLE_TIME (10) | |
60 | ||
3eef6257 | 61 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd); |
e494f6a7 HR |
62 | static int scsi_try_to_abort_cmd(struct scsi_host_template *, |
63 | struct scsi_cmnd *); | |
3eef6257 | 64 | |
1da177e4 LT |
65 | void scsi_eh_wakeup(struct Scsi_Host *shost) |
66 | { | |
f0317e88 BVA |
67 | lockdep_assert_held(shost->host_lock); |
68 | ||
74665016 | 69 | if (atomic_read(&shost->host_busy) == shost->host_failed) { |
bf816235 | 70 | trace_scsi_eh_wakeup(shost); |
3ed7a470 | 71 | wake_up_process(shost->ehandler); |
91921e01 HR |
72 | SCSI_LOG_ERROR_RECOVERY(5, shost_printk(KERN_INFO, shost, |
73 | "Waking error handler thread\n")); | |
1da177e4 LT |
74 | } |
75 | } | |
f8bbfc24 TH |
76 | |
77 | /** | |
78 | * scsi_schedule_eh - schedule EH for SCSI host | |
79 | * @shost: SCSI host to invoke error handling on. | |
80 | * | |
81 | * Schedule SCSI EH without scmd. | |
dc8875e1 | 82 | */ |
f8bbfc24 TH |
83 | void scsi_schedule_eh(struct Scsi_Host *shost) |
84 | { | |
85 | unsigned long flags; | |
86 | ||
87 | spin_lock_irqsave(shost->host_lock, flags); | |
88 | ||
89 | if (scsi_host_set_state(shost, SHOST_RECOVERY) == 0 || | |
90 | scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY) == 0) { | |
91 | shost->host_eh_scheduled++; | |
92 | scsi_eh_wakeup(shost); | |
93 | } | |
94 | ||
95 | spin_unlock_irqrestore(shost->host_lock, flags); | |
96 | } | |
97 | EXPORT_SYMBOL_GPL(scsi_schedule_eh); | |
1da177e4 | 98 | |
b4562022 HR |
99 | static int scsi_host_eh_past_deadline(struct Scsi_Host *shost) |
100 | { | |
bb3b621a | 101 | if (!shost->last_reset || shost->eh_deadline == -1) |
b4562022 HR |
102 | return 0; |
103 | ||
76ad3e59 HR |
104 | /* |
105 | * 32bit accesses are guaranteed to be atomic | |
106 | * (on all supported architectures), so instead | |
107 | * of using a spinlock we can as well double check | |
bb3b621a | 108 | * if eh_deadline has been set to 'off' during the |
76ad3e59 HR |
109 | * time_before call. |
110 | */ | |
111 | if (time_before(jiffies, shost->last_reset + shost->eh_deadline) && | |
bb3b621a | 112 | shost->eh_deadline > -1) |
b4562022 HR |
113 | return 0; |
114 | ||
115 | return 1; | |
116 | } | |
117 | ||
e494f6a7 HR |
118 | /** |
119 | * scmd_eh_abort_handler - Handle command aborts | |
120 | * @work: command to be aborted. | |
923f46f9 BVA |
121 | * |
122 | * Note: this function must be called only for a command that has timed out. | |
123 | * Because the block layer marks a request as complete before it calls | |
124 | * scsi_times_out(), a .scsi_done() call from the LLD for a command that has | |
125 | * timed out do not have any effect. Hence it is safe to call | |
126 | * scsi_finish_command() from this function. | |
e494f6a7 HR |
127 | */ |
128 | void | |
129 | scmd_eh_abort_handler(struct work_struct *work) | |
130 | { | |
131 | struct scsi_cmnd *scmd = | |
132 | container_of(work, struct scsi_cmnd, abort_work.work); | |
133 | struct scsi_device *sdev = scmd->device; | |
e494f6a7 HR |
134 | int rtn; |
135 | ||
e494f6a7 | 136 | if (scsi_host_eh_past_deadline(sdev->host)) { |
e494f6a7 HR |
137 | SCSI_LOG_ERROR_RECOVERY(3, |
138 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 139 | "eh timeout, not aborting\n")); |
e494f6a7 | 140 | } else { |
e494f6a7 HR |
141 | SCSI_LOG_ERROR_RECOVERY(3, |
142 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 143 | "aborting command\n")); |
e494f6a7 HR |
144 | rtn = scsi_try_to_abort_cmd(sdev->host->hostt, scmd); |
145 | if (rtn == SUCCESS) { | |
8922a908 | 146 | set_host_byte(scmd, DID_TIME_OUT); |
bb3b621a RM |
147 | if (scsi_host_eh_past_deadline(sdev->host)) { |
148 | SCSI_LOG_ERROR_RECOVERY(3, | |
149 | scmd_printk(KERN_INFO, scmd, | |
470613b4 HR |
150 | "eh timeout, not retrying " |
151 | "aborted command\n")); | |
bb3b621a | 152 | } else if (!scsi_noretry_cmd(scmd) && |
e494f6a7 HR |
153 | (++scmd->retries <= scmd->allowed)) { |
154 | SCSI_LOG_ERROR_RECOVERY(3, | |
155 | scmd_printk(KERN_WARNING, scmd, | |
470613b4 | 156 | "retry aborted command\n")); |
e494f6a7 | 157 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); |
bb3b621a | 158 | return; |
e494f6a7 HR |
159 | } else { |
160 | SCSI_LOG_ERROR_RECOVERY(3, | |
161 | scmd_printk(KERN_WARNING, scmd, | |
470613b4 | 162 | "finish aborted command\n")); |
e494f6a7 | 163 | scsi_finish_command(scmd); |
bb3b621a | 164 | return; |
e494f6a7 | 165 | } |
bb3b621a RM |
166 | } else { |
167 | SCSI_LOG_ERROR_RECOVERY(3, | |
168 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 169 | "cmd abort %s\n", |
883a030f HR |
170 | (rtn == FAST_IO_FAIL) ? |
171 | "not send" : "failed")); | |
e494f6a7 | 172 | } |
e494f6a7 HR |
173 | } |
174 | ||
a0658632 | 175 | scsi_eh_scmd_add(scmd); |
e494f6a7 HR |
176 | } |
177 | ||
178 | /** | |
179 | * scsi_abort_command - schedule a command abort | |
180 | * @scmd: scmd to abort. | |
181 | * | |
182 | * We only need to abort commands after a command timeout | |
183 | */ | |
184 | static int | |
185 | scsi_abort_command(struct scsi_cmnd *scmd) | |
186 | { | |
187 | struct scsi_device *sdev = scmd->device; | |
188 | struct Scsi_Host *shost = sdev->host; | |
189 | unsigned long flags; | |
190 | ||
191 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) { | |
192 | /* | |
193 | * Retry after abort failed, escalate to next level. | |
194 | */ | |
195 | SCSI_LOG_ERROR_RECOVERY(3, | |
196 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 197 | "previous abort failed\n")); |
fcc95a76 | 198 | BUG_ON(delayed_work_pending(&scmd->abort_work)); |
e494f6a7 HR |
199 | return FAILED; |
200 | } | |
201 | ||
e494f6a7 | 202 | spin_lock_irqsave(shost->host_lock, flags); |
bb3b621a | 203 | if (shost->eh_deadline != -1 && !shost->last_reset) |
e494f6a7 HR |
204 | shost->last_reset = jiffies; |
205 | spin_unlock_irqrestore(shost->host_lock, flags); | |
206 | ||
207 | scmd->eh_eflags |= SCSI_EH_ABORT_SCHEDULED; | |
208 | SCSI_LOG_ERROR_RECOVERY(3, | |
470613b4 | 209 | scmd_printk(KERN_INFO, scmd, "abort scheduled\n")); |
e494f6a7 HR |
210 | queue_delayed_work(shost->tmf_work_q, &scmd->abort_work, HZ / 100); |
211 | return SUCCESS; | |
212 | } | |
213 | ||
1da177e4 | 214 | /** |
7a38dc0b | 215 | * scsi_eh_reset - call into ->eh_action to reset internal counters |
1da177e4 | 216 | * @scmd: scmd to run eh on. |
1da177e4 | 217 | * |
7a38dc0b HR |
218 | * The scsi driver might be carrying internal state about the |
219 | * devices, so we need to call into the driver to reset the | |
220 | * internal state once the error handler is started. | |
dc8875e1 | 221 | */ |
7a38dc0b HR |
222 | static void scsi_eh_reset(struct scsi_cmnd *scmd) |
223 | { | |
224 | if (!blk_rq_is_passthrough(scmd->request)) { | |
225 | struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd); | |
226 | if (sdrv->eh_reset) | |
227 | sdrv->eh_reset(scmd); | |
228 | } | |
229 | } | |
230 | ||
3bd6f43f BVA |
231 | static void scsi_eh_inc_host_failed(struct rcu_head *head) |
232 | { | |
3be8828f BVA |
233 | struct scsi_cmnd *scmd = container_of(head, typeof(*scmd), rcu); |
234 | struct Scsi_Host *shost = scmd->device->host; | |
3bd6f43f BVA |
235 | unsigned long flags; |
236 | ||
237 | spin_lock_irqsave(shost->host_lock, flags); | |
238 | shost->host_failed++; | |
239 | scsi_eh_wakeup(shost); | |
240 | spin_unlock_irqrestore(shost->host_lock, flags); | |
241 | } | |
242 | ||
1da177e4 LT |
243 | /** |
244 | * scsi_eh_scmd_add - add scsi cmd to error handling. | |
245 | * @scmd: scmd to run eh on. | |
dc8875e1 | 246 | */ |
a0658632 | 247 | void scsi_eh_scmd_add(struct scsi_cmnd *scmd) |
1da177e4 LT |
248 | { |
249 | struct Scsi_Host *shost = scmd->device->host; | |
250 | unsigned long flags; | |
2171b6d0 | 251 | int ret; |
1da177e4 | 252 | |
2171b6d0 | 253 | WARN_ON_ONCE(!shost->ehandler); |
1da177e4 LT |
254 | |
255 | spin_lock_irqsave(shost->host_lock, flags); | |
2171b6d0 HR |
256 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) { |
257 | ret = scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY); | |
258 | WARN_ON_ONCE(ret); | |
259 | } | |
bb3b621a | 260 | if (shost->eh_deadline != -1 && !shost->last_reset) |
b4562022 HR |
261 | shost->last_reset = jiffies; |
262 | ||
7a38dc0b | 263 | scsi_eh_reset(scmd); |
1da177e4 | 264 | list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q); |
1da177e4 | 265 | spin_unlock_irqrestore(shost->host_lock, flags); |
3bd6f43f BVA |
266 | /* |
267 | * Ensure that all tasks observe the host state change before the | |
268 | * host_failed change. | |
269 | */ | |
3be8828f | 270 | call_rcu(&scmd->rcu, scsi_eh_inc_host_failed); |
1da177e4 LT |
271 | } |
272 | ||
1da177e4 LT |
273 | /** |
274 | * scsi_times_out - Timeout function for normal scsi commands. | |
242f9dcb | 275 | * @req: request that is timing out. |
1da177e4 LT |
276 | * |
277 | * Notes: | |
278 | * We do not need to lock this. There is the potential for a race | |
279 | * only in that the normal completion handling might run, but if the | |
280 | * normal completion function determines that the timer has already | |
281 | * fired, then it mustn't do anything. | |
dc8875e1 | 282 | */ |
242f9dcb | 283 | enum blk_eh_timer_return scsi_times_out(struct request *req) |
1da177e4 | 284 | { |
bed2213d | 285 | struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(req); |
6600593c | 286 | enum blk_eh_timer_return rtn = BLK_EH_DONE; |
0bf8c869 | 287 | struct Scsi_Host *host = scmd->device->host; |
6c5f8ce1 | 288 | |
bf816235 | 289 | trace_scsi_dispatch_cmd_timeout(scmd); |
1da177e4 LT |
290 | scsi_log_completion(scmd, TIMEOUT_ERROR); |
291 | ||
bb3b621a | 292 | if (host->eh_deadline != -1 && !host->last_reset) |
b4562022 HR |
293 | host->last_reset = jiffies; |
294 | ||
b6a05c82 | 295 | if (host->hostt->eh_timed_out) |
0bf8c869 | 296 | rtn = host->hostt->eh_timed_out(scmd); |
1da177e4 | 297 | |
6600593c | 298 | if (rtn == BLK_EH_DONE) { |
065990bd KB |
299 | /* |
300 | * For blk-mq, we must set the request state to complete now | |
301 | * before sending the request to the scsi error handler. This | |
302 | * will prevent a use-after-free in the event the LLD manages | |
303 | * to complete the request before the error handler finishes | |
304 | * processing this timed out request. | |
305 | * | |
306 | * If the request was already completed, then the LLD beat the | |
307 | * time out handler from transferring the request to the scsi | |
308 | * error handler. In that case we can return immediately as no | |
309 | * further action is required. | |
310 | */ | |
311 | if (req->q->mq_ops && !blk_mq_mark_complete(req)) | |
312 | return rtn; | |
a0658632 | 313 | if (scsi_abort_command(scmd) != SUCCESS) { |
2171b6d0 | 314 | set_host_byte(scmd, DID_TIME_OUT); |
a0658632 | 315 | scsi_eh_scmd_add(scmd); |
2171b6d0 | 316 | } |
a33c070b | 317 | } |
242f9dcb | 318 | |
fa990781 | 319 | return rtn; |
1da177e4 LT |
320 | } |
321 | ||
322 | /** | |
323 | * scsi_block_when_processing_errors - Prevent cmds from being queued. | |
324 | * @sdev: Device on which we are performing recovery. | |
325 | * | |
326 | * Description: | |
327 | * We block until the host is out of error recovery, and then check to | |
328 | * see whether the host or the device is offline. | |
329 | * | |
330 | * Return value: | |
331 | * 0 when dev was taken offline by error recovery. 1 OK to proceed. | |
dc8875e1 | 332 | */ |
1da177e4 LT |
333 | int scsi_block_when_processing_errors(struct scsi_device *sdev) |
334 | { | |
335 | int online; | |
336 | ||
939647ee | 337 | wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host)); |
1da177e4 LT |
338 | |
339 | online = scsi_device_online(sdev); | |
340 | ||
91921e01 HR |
341 | SCSI_LOG_ERROR_RECOVERY(5, sdev_printk(KERN_INFO, sdev, |
342 | "%s: rtn: %d\n", __func__, online)); | |
1da177e4 LT |
343 | |
344 | return online; | |
345 | } | |
346 | EXPORT_SYMBOL(scsi_block_when_processing_errors); | |
347 | ||
348 | #ifdef CONFIG_SCSI_LOGGING | |
349 | /** | |
350 | * scsi_eh_prt_fail_stats - Log info on failures. | |
351 | * @shost: scsi host being recovered. | |
352 | * @work_q: Queue of scsi cmds to process. | |
dc8875e1 | 353 | */ |
1da177e4 LT |
354 | static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost, |
355 | struct list_head *work_q) | |
356 | { | |
357 | struct scsi_cmnd *scmd; | |
358 | struct scsi_device *sdev; | |
359 | int total_failures = 0; | |
360 | int cmd_failed = 0; | |
361 | int cmd_cancel = 0; | |
362 | int devices_failed = 0; | |
363 | ||
364 | shost_for_each_device(sdev, shost) { | |
365 | list_for_each_entry(scmd, work_q, eh_entry) { | |
366 | if (scmd->device == sdev) { | |
367 | ++total_failures; | |
a0658632 | 368 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) |
1da177e4 | 369 | ++cmd_cancel; |
0bf8c869 | 370 | else |
1da177e4 LT |
371 | ++cmd_failed; |
372 | } | |
373 | } | |
374 | ||
375 | if (cmd_cancel || cmd_failed) { | |
376 | SCSI_LOG_ERROR_RECOVERY(3, | |
a3a790dc | 377 | shost_printk(KERN_INFO, shost, |
9ccfc756 | 378 | "%s: cmds failed: %d, cancel: %d\n", |
cadbd4a5 | 379 | __func__, cmd_failed, |
9ccfc756 | 380 | cmd_cancel)); |
1da177e4 LT |
381 | cmd_cancel = 0; |
382 | cmd_failed = 0; | |
383 | ++devices_failed; | |
384 | } | |
385 | } | |
386 | ||
91921e01 HR |
387 | SCSI_LOG_ERROR_RECOVERY(2, shost_printk(KERN_INFO, shost, |
388 | "Total of %d commands on %d" | |
389 | " devices require eh work\n", | |
0bf8c869 | 390 | total_failures, devices_failed)); |
1da177e4 LT |
391 | } |
392 | #endif | |
393 | ||
279afdfe EM |
394 | /** |
395 | * scsi_report_lun_change - Set flag on all *other* devices on the same target | |
396 | * to indicate that a UNIT ATTENTION is expected. | |
397 | * @sdev: Device reporting the UNIT ATTENTION | |
398 | */ | |
399 | static void scsi_report_lun_change(struct scsi_device *sdev) | |
400 | { | |
401 | sdev->sdev_target->expecting_lun_change = 1; | |
402 | } | |
403 | ||
404 | /** | |
405 | * scsi_report_sense - Examine scsi sense information and log messages for | |
406 | * certain conditions, also issue uevents for some of them. | |
407 | * @sdev: Device reporting the sense code | |
408 | * @sshdr: sshdr to be examined | |
409 | */ | |
410 | static void scsi_report_sense(struct scsi_device *sdev, | |
411 | struct scsi_sense_hdr *sshdr) | |
412 | { | |
413 | enum scsi_device_event evt_type = SDEV_EVT_MAXBITS; /* i.e. none */ | |
414 | ||
415 | if (sshdr->sense_key == UNIT_ATTENTION) { | |
416 | if (sshdr->asc == 0x3f && sshdr->ascq == 0x03) { | |
417 | evt_type = SDEV_EVT_INQUIRY_CHANGE_REPORTED; | |
418 | sdev_printk(KERN_WARNING, sdev, | |
419 | "Inquiry data has changed"); | |
420 | } else if (sshdr->asc == 0x3f && sshdr->ascq == 0x0e) { | |
421 | evt_type = SDEV_EVT_LUN_CHANGE_REPORTED; | |
422 | scsi_report_lun_change(sdev); | |
423 | sdev_printk(KERN_WARNING, sdev, | |
424 | "Warning! Received an indication that the " | |
425 | "LUN assignments on this target have " | |
426 | "changed. The Linux SCSI layer does not " | |
427 | "automatically remap LUN assignments.\n"); | |
428 | } else if (sshdr->asc == 0x3f) | |
429 | sdev_printk(KERN_WARNING, sdev, | |
430 | "Warning! Received an indication that the " | |
431 | "operating parameters on this target have " | |
432 | "changed. The Linux SCSI layer does not " | |
433 | "automatically adjust these parameters.\n"); | |
434 | ||
435 | if (sshdr->asc == 0x38 && sshdr->ascq == 0x07) { | |
436 | evt_type = SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED; | |
437 | sdev_printk(KERN_WARNING, sdev, | |
438 | "Warning! Received an indication that the " | |
439 | "LUN reached a thin provisioning soft " | |
440 | "threshold.\n"); | |
441 | } | |
442 | ||
cf3431bb HR |
443 | if (sshdr->asc == 0x29) { |
444 | evt_type = SDEV_EVT_POWER_ON_RESET_OCCURRED; | |
445 | sdev_printk(KERN_WARNING, sdev, | |
446 | "Power-on or device reset occurred\n"); | |
447 | } | |
448 | ||
279afdfe EM |
449 | if (sshdr->asc == 0x2a && sshdr->ascq == 0x01) { |
450 | evt_type = SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED; | |
451 | sdev_printk(KERN_WARNING, sdev, | |
452 | "Mode parameters changed"); | |
14c3e677 HR |
453 | } else if (sshdr->asc == 0x2a && sshdr->ascq == 0x06) { |
454 | evt_type = SDEV_EVT_ALUA_STATE_CHANGE_REPORTED; | |
455 | sdev_printk(KERN_WARNING, sdev, | |
456 | "Asymmetric access state changed"); | |
279afdfe EM |
457 | } else if (sshdr->asc == 0x2a && sshdr->ascq == 0x09) { |
458 | evt_type = SDEV_EVT_CAPACITY_CHANGE_REPORTED; | |
459 | sdev_printk(KERN_WARNING, sdev, | |
460 | "Capacity data has changed"); | |
461 | } else if (sshdr->asc == 0x2a) | |
462 | sdev_printk(KERN_WARNING, sdev, | |
463 | "Parameters changed"); | |
464 | } | |
465 | ||
466 | if (evt_type != SDEV_EVT_MAXBITS) { | |
467 | set_bit(evt_type, sdev->pending_events); | |
468 | schedule_work(&sdev->event_work); | |
469 | } | |
470 | } | |
471 | ||
1da177e4 LT |
472 | /** |
473 | * scsi_check_sense - Examine scsi cmd sense | |
474 | * @scmd: Cmd to have sense checked. | |
475 | * | |
476 | * Return value: | |
87f14e65 | 477 | * SUCCESS or FAILED or NEEDS_RETRY or ADD_TO_MLQUEUE |
1da177e4 LT |
478 | * |
479 | * Notes: | |
480 | * When a deferred error is detected the current command has | |
481 | * not been executed and needs retrying. | |
dc8875e1 | 482 | */ |
3852e373 | 483 | int scsi_check_sense(struct scsi_cmnd *scmd) |
1da177e4 | 484 | { |
a6a8d9f8 | 485 | struct scsi_device *sdev = scmd->device; |
1da177e4 LT |
486 | struct scsi_sense_hdr sshdr; |
487 | ||
488 | if (! scsi_command_normalize_sense(scmd, &sshdr)) | |
489 | return FAILED; /* no valid sense data */ | |
490 | ||
279afdfe EM |
491 | scsi_report_sense(sdev, &sshdr); |
492 | ||
1da177e4 LT |
493 | if (scsi_sense_is_deferred(&sshdr)) |
494 | return NEEDS_RETRY; | |
495 | ||
ee14c674 | 496 | if (sdev->handler && sdev->handler->check_sense) { |
a6a8d9f8 CS |
497 | int rc; |
498 | ||
ee14c674 | 499 | rc = sdev->handler->check_sense(sdev, &sshdr); |
a6a8d9f8 CS |
500 | if (rc != SCSI_RETURN_NOT_HANDLED) |
501 | return rc; | |
502 | /* handler does not care. Drop down to default handling */ | |
503 | } | |
504 | ||
e925cc43 CH |
505 | if (scmd->cmnd[0] == TEST_UNIT_READY && scmd->scsi_done != scsi_eh_done) |
506 | /* | |
507 | * nasty: for mid-layer issued TURs, we need to return the | |
508 | * actual sense data without any recovery attempt. For eh | |
509 | * issued ones, we need to try to recover and interpret | |
510 | */ | |
511 | return SUCCESS; | |
512 | ||
1da177e4 LT |
513 | /* |
514 | * Previous logic looked for FILEMARK, EOM or ILI which are | |
515 | * mainly associated with tapes and returned SUCCESS. | |
516 | */ | |
517 | if (sshdr.response_code == 0x70) { | |
518 | /* fixed format */ | |
519 | if (scmd->sense_buffer[2] & 0xe0) | |
520 | return SUCCESS; | |
521 | } else { | |
522 | /* | |
523 | * descriptor format: look for "stream commands sense data | |
524 | * descriptor" (see SSC-3). Assume single sense data | |
525 | * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG. | |
526 | */ | |
527 | if ((sshdr.additional_length > 3) && | |
528 | (scmd->sense_buffer[8] == 0x4) && | |
529 | (scmd->sense_buffer[11] & 0xe0)) | |
530 | return SUCCESS; | |
531 | } | |
532 | ||
533 | switch (sshdr.sense_key) { | |
534 | case NO_SENSE: | |
535 | return SUCCESS; | |
536 | case RECOVERED_ERROR: | |
537 | return /* soft_error */ SUCCESS; | |
538 | ||
539 | case ABORTED_COMMAND: | |
511e44f4 MP |
540 | if (sshdr.asc == 0x10) /* DIF */ |
541 | return SUCCESS; | |
542 | ||
29cfc2ab MW |
543 | if (sshdr.asc == 0x44 && sdev->sdev_bflags & BLIST_RETRY_ITF) |
544 | return ADD_TO_MLQUEUE; | |
c3606520 MW |
545 | if (sshdr.asc == 0xc1 && sshdr.ascq == 0x01 && |
546 | sdev->sdev_bflags & BLIST_RETRY_ASC_C1) | |
547 | return ADD_TO_MLQUEUE; | |
29cfc2ab | 548 | |
1da177e4 LT |
549 | return NEEDS_RETRY; |
550 | case NOT_READY: | |
551 | case UNIT_ATTENTION: | |
552 | /* | |
553 | * if we are expecting a cc/ua because of a bus reset that we | |
554 | * performed, treat this just as a retry. otherwise this is | |
555 | * information that we should pass up to the upper-level driver | |
556 | * so that we can deal with it there. | |
557 | */ | |
558 | if (scmd->device->expecting_cc_ua) { | |
dfcf7775 TH |
559 | /* |
560 | * Because some device does not queue unit | |
561 | * attentions correctly, we carefully check | |
562 | * additional sense code and qualifier so as | |
563 | * not to squash media change unit attention. | |
564 | */ | |
565 | if (sshdr.asc != 0x28 || sshdr.ascq != 0x00) { | |
566 | scmd->device->expecting_cc_ua = 0; | |
567 | return NEEDS_RETRY; | |
568 | } | |
1da177e4 | 569 | } |
279afdfe EM |
570 | /* |
571 | * we might also expect a cc/ua if another LUN on the target | |
572 | * reported a UA with an ASC/ASCQ of 3F 0E - | |
573 | * REPORTED LUNS DATA HAS CHANGED. | |
574 | */ | |
575 | if (scmd->device->sdev_target->expecting_lun_change && | |
576 | sshdr.asc == 0x3f && sshdr.ascq == 0x0e) | |
577 | return NEEDS_RETRY; | |
1da177e4 | 578 | /* |
0bf8c869 | 579 | * if the device is in the process of becoming ready, we |
1da177e4 LT |
580 | * should retry. |
581 | */ | |
582 | if ((sshdr.asc == 0x04) && (sshdr.ascq == 0x01)) | |
583 | return NEEDS_RETRY; | |
584 | /* | |
585 | * if the device is not started, we need to wake | |
586 | * the error handler to start the motor | |
587 | */ | |
588 | if (scmd->device->allow_restart && | |
589 | (sshdr.asc == 0x04) && (sshdr.ascq == 0x02)) | |
590 | return FAILED; | |
02e031cb CH |
591 | /* |
592 | * Pass the UA upwards for a determination in the completion | |
593 | * functions. | |
594 | */ | |
595 | return SUCCESS; | |
1da177e4 | 596 | |
63583cca | 597 | /* these are not supported */ |
a9d6ceb8 HR |
598 | case DATA_PROTECT: |
599 | if (sshdr.asc == 0x27 && sshdr.ascq == 0x07) { | |
600 | /* Thin provisioning hard threshold reached */ | |
601 | set_host_byte(scmd, DID_ALLOC_FAILURE); | |
602 | return SUCCESS; | |
603 | } | |
3bf2ff67 | 604 | /* FALLTHROUGH */ |
1da177e4 LT |
605 | case COPY_ABORTED: |
606 | case VOLUME_OVERFLOW: | |
607 | case MISCOMPARE: | |
63583cca | 608 | case BLANK_CHECK: |
87f14e65 HR |
609 | set_host_byte(scmd, DID_TARGET_FAILURE); |
610 | return SUCCESS; | |
1da177e4 LT |
611 | |
612 | case MEDIUM_ERROR: | |
fd1b494d LT |
613 | if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */ |
614 | sshdr.asc == 0x13 || /* AMNF DATA FIELD */ | |
615 | sshdr.asc == 0x14) { /* RECORD NOT FOUND */ | |
7e782af5 | 616 | set_host_byte(scmd, DID_MEDIUM_ERROR); |
87f14e65 | 617 | return SUCCESS; |
fd1b494d | 618 | } |
1da177e4 LT |
619 | return NEEDS_RETRY; |
620 | ||
621 | case HARDWARE_ERROR: | |
622 | if (scmd->device->retry_hwerror) | |
bb0003c1 | 623 | return ADD_TO_MLQUEUE; |
1da177e4 | 624 | else |
87f14e65 | 625 | set_host_byte(scmd, DID_TARGET_FAILURE); |
3bf2ff67 | 626 | /* FALLTHROUGH */ |
1da177e4 LT |
627 | |
628 | case ILLEGAL_REQUEST: | |
47ac56db MS |
629 | if (sshdr.asc == 0x20 || /* Invalid command operation code */ |
630 | sshdr.asc == 0x21 || /* Logical block address out of range */ | |
a8bbb2ab | 631 | sshdr.asc == 0x22 || /* Invalid function */ |
47ac56db | 632 | sshdr.asc == 0x24 || /* Invalid field in cdb */ |
d0b7a909 MW |
633 | sshdr.asc == 0x26 || /* Parameter value invalid */ |
634 | sshdr.asc == 0x27) { /* Write protected */ | |
87f14e65 | 635 | set_host_byte(scmd, DID_TARGET_FAILURE); |
47ac56db MS |
636 | } |
637 | return SUCCESS; | |
638 | ||
1da177e4 LT |
639 | default: |
640 | return SUCCESS; | |
641 | } | |
642 | } | |
3852e373 | 643 | EXPORT_SYMBOL_GPL(scsi_check_sense); |
1da177e4 | 644 | |
4a84067d VD |
645 | static void scsi_handle_queue_ramp_up(struct scsi_device *sdev) |
646 | { | |
647 | struct scsi_host_template *sht = sdev->host->hostt; | |
648 | struct scsi_device *tmp_sdev; | |
649 | ||
c40ecc12 | 650 | if (!sht->track_queue_depth || |
4a84067d VD |
651 | sdev->queue_depth >= sdev->max_queue_depth) |
652 | return; | |
653 | ||
654 | if (time_before(jiffies, | |
655 | sdev->last_queue_ramp_up + sdev->queue_ramp_up_period)) | |
656 | return; | |
657 | ||
658 | if (time_before(jiffies, | |
659 | sdev->last_queue_full_time + sdev->queue_ramp_up_period)) | |
660 | return; | |
661 | ||
662 | /* | |
663 | * Walk all devices of a target and do | |
664 | * ramp up on them. | |
665 | */ | |
666 | shost_for_each_device(tmp_sdev, sdev->host) { | |
667 | if (tmp_sdev->channel != sdev->channel || | |
668 | tmp_sdev->id != sdev->id || | |
669 | tmp_sdev->queue_depth == sdev->max_queue_depth) | |
670 | continue; | |
c40ecc12 | 671 | |
db5ed4df | 672 | scsi_change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1); |
4a84067d VD |
673 | sdev->last_queue_ramp_up = jiffies; |
674 | } | |
675 | } | |
676 | ||
42a6a918 MC |
677 | static void scsi_handle_queue_full(struct scsi_device *sdev) |
678 | { | |
679 | struct scsi_host_template *sht = sdev->host->hostt; | |
680 | struct scsi_device *tmp_sdev; | |
681 | ||
c40ecc12 | 682 | if (!sht->track_queue_depth) |
42a6a918 MC |
683 | return; |
684 | ||
685 | shost_for_each_device(tmp_sdev, sdev->host) { | |
686 | if (tmp_sdev->channel != sdev->channel || | |
687 | tmp_sdev->id != sdev->id) | |
688 | continue; | |
689 | /* | |
690 | * We do not know the number of commands that were at | |
691 | * the device when we got the queue full so we start | |
692 | * from the highest possible value and work our way down. | |
693 | */ | |
c40ecc12 | 694 | scsi_track_queue_full(tmp_sdev, tmp_sdev->queue_depth - 1); |
42a6a918 MC |
695 | } |
696 | } | |
697 | ||
1da177e4 LT |
698 | /** |
699 | * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD. | |
700 | * @scmd: SCSI cmd to examine. | |
701 | * | |
702 | * Notes: | |
703 | * This is *only* called when we are examining the status of commands | |
704 | * queued during error recovery. the main difference here is that we | |
705 | * don't allow for the possibility of retries here, and we are a lot | |
706 | * more restrictive about what we consider acceptable. | |
dc8875e1 | 707 | */ |
1da177e4 LT |
708 | static int scsi_eh_completed_normally(struct scsi_cmnd *scmd) |
709 | { | |
710 | /* | |
711 | * first check the host byte, to see if there is anything in there | |
712 | * that would indicate what we need to do. | |
713 | */ | |
714 | if (host_byte(scmd->result) == DID_RESET) { | |
715 | /* | |
716 | * rats. we are already in the error handler, so we now | |
717 | * get to try and figure out what to do next. if the sense | |
718 | * is valid, we have a pretty good idea of what to do. | |
719 | * if not, we mark it as FAILED. | |
720 | */ | |
721 | return scsi_check_sense(scmd); | |
722 | } | |
723 | if (host_byte(scmd->result) != DID_OK) | |
724 | return FAILED; | |
725 | ||
726 | /* | |
727 | * next, check the message byte. | |
728 | */ | |
729 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
730 | return FAILED; | |
731 | ||
732 | /* | |
733 | * now, check the status byte to see if this indicates | |
734 | * anything special. | |
735 | */ | |
736 | switch (status_byte(scmd->result)) { | |
737 | case GOOD: | |
4a84067d | 738 | scsi_handle_queue_ramp_up(scmd->device); |
3bf2ff67 | 739 | /* FALLTHROUGH */ |
1da177e4 LT |
740 | case COMMAND_TERMINATED: |
741 | return SUCCESS; | |
742 | case CHECK_CONDITION: | |
743 | return scsi_check_sense(scmd); | |
744 | case CONDITION_GOOD: | |
745 | case INTERMEDIATE_GOOD: | |
746 | case INTERMEDIATE_C_GOOD: | |
747 | /* | |
748 | * who knows? FIXME(eric) | |
749 | */ | |
750 | return SUCCESS; | |
5f91bb05 | 751 | case RESERVATION_CONFLICT: |
67110dfd JB |
752 | if (scmd->cmnd[0] == TEST_UNIT_READY) |
753 | /* it is a success, we probed the device and | |
754 | * found it */ | |
755 | return SUCCESS; | |
756 | /* otherwise, we failed to send the command */ | |
757 | return FAILED; | |
1da177e4 | 758 | case QUEUE_FULL: |
42a6a918 MC |
759 | scsi_handle_queue_full(scmd->device); |
760 | /* fall through */ | |
761 | case BUSY: | |
3eb3a928 | 762 | return NEEDS_RETRY; |
1da177e4 LT |
763 | default: |
764 | return FAILED; | |
765 | } | |
766 | return FAILED; | |
767 | } | |
768 | ||
1da177e4 LT |
769 | /** |
770 | * scsi_eh_done - Completion function for error handling. | |
771 | * @scmd: Cmd that is done. | |
dc8875e1 | 772 | */ |
1da177e4 LT |
773 | static void scsi_eh_done(struct scsi_cmnd *scmd) |
774 | { | |
0bf8c869 | 775 | struct completion *eh_action; |
85631672 | 776 | |
91921e01 | 777 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
470613b4 | 778 | "%s result: %x\n", __func__, scmd->result)); |
85631672 MR |
779 | |
780 | eh_action = scmd->device->host->eh_action; | |
781 | if (eh_action) | |
782 | complete(eh_action); | |
1da177e4 LT |
783 | } |
784 | ||
292148f8 BK |
785 | /** |
786 | * scsi_try_host_reset - ask host adapter to reset itself | |
c2b3ebd0 | 787 | * @scmd: SCSI cmd to send host reset. |
dc8875e1 | 788 | */ |
292148f8 BK |
789 | static int scsi_try_host_reset(struct scsi_cmnd *scmd) |
790 | { | |
791 | unsigned long flags; | |
792 | int rtn; | |
0bf8c869 JJ |
793 | struct Scsi_Host *host = scmd->device->host; |
794 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 | 795 | |
91921e01 HR |
796 | SCSI_LOG_ERROR_RECOVERY(3, |
797 | shost_printk(KERN_INFO, host, "Snd Host RST\n")); | |
292148f8 | 798 | |
0bf8c869 | 799 | if (!hostt->eh_host_reset_handler) |
292148f8 BK |
800 | return FAILED; |
801 | ||
0bf8c869 | 802 | rtn = hostt->eh_host_reset_handler(scmd); |
292148f8 BK |
803 | |
804 | if (rtn == SUCCESS) { | |
0bf8c869 | 805 | if (!hostt->skip_settle_delay) |
292148f8 | 806 | ssleep(HOST_RESET_SETTLE_TIME); |
0bf8c869 JJ |
807 | spin_lock_irqsave(host->host_lock, flags); |
808 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
809 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
810 | } |
811 | ||
812 | return rtn; | |
813 | } | |
814 | ||
815 | /** | |
816 | * scsi_try_bus_reset - ask host to perform a bus reset | |
817 | * @scmd: SCSI cmd to send bus reset. | |
dc8875e1 | 818 | */ |
292148f8 BK |
819 | static int scsi_try_bus_reset(struct scsi_cmnd *scmd) |
820 | { | |
821 | unsigned long flags; | |
822 | int rtn; | |
0bf8c869 JJ |
823 | struct Scsi_Host *host = scmd->device->host; |
824 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 | 825 | |
91921e01 HR |
826 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
827 | "%s: Snd Bus RST\n", __func__)); | |
292148f8 | 828 | |
0bf8c869 | 829 | if (!hostt->eh_bus_reset_handler) |
292148f8 BK |
830 | return FAILED; |
831 | ||
0bf8c869 | 832 | rtn = hostt->eh_bus_reset_handler(scmd); |
292148f8 BK |
833 | |
834 | if (rtn == SUCCESS) { | |
0bf8c869 | 835 | if (!hostt->skip_settle_delay) |
292148f8 | 836 | ssleep(BUS_RESET_SETTLE_TIME); |
0bf8c869 JJ |
837 | spin_lock_irqsave(host->host_lock, flags); |
838 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
839 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
840 | } |
841 | ||
842 | return rtn; | |
843 | } | |
844 | ||
30bd7df8 MC |
845 | static void __scsi_report_device_reset(struct scsi_device *sdev, void *data) |
846 | { | |
847 | sdev->was_reset = 1; | |
848 | sdev->expecting_cc_ua = 1; | |
849 | } | |
850 | ||
851 | /** | |
852 | * scsi_try_target_reset - Ask host to perform a target reset | |
853 | * @scmd: SCSI cmd used to send a target reset | |
854 | * | |
855 | * Notes: | |
856 | * There is no timeout for this operation. if this operation is | |
857 | * unreliable for a given host, then the host itself needs to put a | |
858 | * timer on it, and set the host back to a consistent state prior to | |
859 | * returning. | |
860 | */ | |
861 | static int scsi_try_target_reset(struct scsi_cmnd *scmd) | |
862 | { | |
863 | unsigned long flags; | |
864 | int rtn; | |
0bf8c869 JJ |
865 | struct Scsi_Host *host = scmd->device->host; |
866 | struct scsi_host_template *hostt = host->hostt; | |
30bd7df8 | 867 | |
0bf8c869 | 868 | if (!hostt->eh_target_reset_handler) |
30bd7df8 MC |
869 | return FAILED; |
870 | ||
0bf8c869 | 871 | rtn = hostt->eh_target_reset_handler(scmd); |
30bd7df8 | 872 | if (rtn == SUCCESS) { |
0bf8c869 | 873 | spin_lock_irqsave(host->host_lock, flags); |
30bd7df8 MC |
874 | __starget_for_each_device(scsi_target(scmd->device), NULL, |
875 | __scsi_report_device_reset); | |
0bf8c869 | 876 | spin_unlock_irqrestore(host->host_lock, flags); |
30bd7df8 MC |
877 | } |
878 | ||
879 | return rtn; | |
880 | } | |
881 | ||
292148f8 BK |
882 | /** |
883 | * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev | |
884 | * @scmd: SCSI cmd used to send BDR | |
885 | * | |
886 | * Notes: | |
887 | * There is no timeout for this operation. if this operation is | |
888 | * unreliable for a given host, then the host itself needs to put a | |
889 | * timer on it, and set the host back to a consistent state prior to | |
890 | * returning. | |
dc8875e1 | 891 | */ |
292148f8 BK |
892 | static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd) |
893 | { | |
894 | int rtn; | |
0bf8c869 | 895 | struct scsi_host_template *hostt = scmd->device->host->hostt; |
292148f8 | 896 | |
0bf8c869 | 897 | if (!hostt->eh_device_reset_handler) |
292148f8 BK |
898 | return FAILED; |
899 | ||
0bf8c869 | 900 | rtn = hostt->eh_device_reset_handler(scmd); |
30bd7df8 MC |
901 | if (rtn == SUCCESS) |
902 | __scsi_report_device_reset(scmd->device, NULL); | |
292148f8 BK |
903 | return rtn; |
904 | } | |
905 | ||
883a030f HR |
906 | /** |
907 | * scsi_try_to_abort_cmd - Ask host to abort a SCSI command | |
6583f6fb | 908 | * @hostt: SCSI driver host template |
883a030f HR |
909 | * @scmd: SCSI cmd used to send a target reset |
910 | * | |
911 | * Return value: | |
912 | * SUCCESS, FAILED, or FAST_IO_FAIL | |
913 | * | |
914 | * Notes: | |
915 | * SUCCESS does not necessarily indicate that the command | |
916 | * has been aborted; it only indicates that the LLDDs | |
917 | * has cleared all references to that command. | |
918 | * LLDDs should return FAILED only if an abort was required | |
919 | * but could not be executed. LLDDs should return FAST_IO_FAIL | |
920 | * if the device is temporarily unavailable (eg due to a | |
921 | * link down on FibreChannel) | |
922 | */ | |
923 | static int scsi_try_to_abort_cmd(struct scsi_host_template *hostt, | |
924 | struct scsi_cmnd *scmd) | |
292148f8 | 925 | { |
0bf8c869 | 926 | if (!hostt->eh_abort_handler) |
292148f8 BK |
927 | return FAILED; |
928 | ||
0bf8c869 | 929 | return hostt->eh_abort_handler(scmd); |
292148f8 BK |
930 | } |
931 | ||
292148f8 BK |
932 | static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd) |
933 | { | |
0bf8c869 | 934 | if (scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd) != SUCCESS) |
292148f8 | 935 | if (scsi_try_bus_device_reset(scmd) != SUCCESS) |
30bd7df8 MC |
936 | if (scsi_try_target_reset(scmd) != SUCCESS) |
937 | if (scsi_try_bus_reset(scmd) != SUCCESS) | |
938 | scsi_try_host_reset(scmd); | |
292148f8 BK |
939 | } |
940 | ||
1da177e4 | 941 | /** |
3b729f76 | 942 | * scsi_eh_prep_cmnd - Save a scsi command info as part of error recovery |
2dc611de | 943 | * @scmd: SCSI command structure to hijack |
e1c23468 | 944 | * @ses: structure to save restore information |
55db6c1b | 945 | * @cmnd: CDB to send. Can be NULL if no new cmnd is needed |
64a87b24 | 946 | * @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB) |
55db6c1b | 947 | * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored) |
2dc611de | 948 | * |
e1c23468 | 949 | * This function is used to save a scsi command information before re-execution |
55db6c1b BH |
950 | * as part of the error recovery process. If @sense_bytes is 0 the command |
951 | * sent must be one that does not transfer any data. If @sense_bytes != 0 | |
952 | * @cmnd is ignored and this functions sets up a REQUEST_SENSE command | |
953 | * and cmnd buffers to read @sense_bytes into @scmd->sense_buffer. | |
dc8875e1 | 954 | */ |
e1c23468 BH |
955 | void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, |
956 | unsigned char *cmnd, int cmnd_size, unsigned sense_bytes) | |
1da177e4 | 957 | { |
f59114b7 | 958 | struct scsi_device *sdev = scmd->device; |
1da177e4 | 959 | |
631c228c CH |
960 | /* |
961 | * We need saved copies of a number of fields - this is because | |
962 | * error handling may need to overwrite these with different values | |
963 | * to run different commands, and once error handling is complete, | |
964 | * we will need to restore these values prior to running the actual | |
965 | * command. | |
966 | */ | |
e1c23468 | 967 | ses->cmd_len = scmd->cmd_len; |
64a87b24 | 968 | ses->cmnd = scmd->cmnd; |
e1c23468 | 969 | ses->data_direction = scmd->sc_data_direction; |
30b0c37b | 970 | ses->sdb = scmd->sdb; |
6f9a35e2 | 971 | ses->next_rq = scmd->request->next_rq; |
e1c23468 | 972 | ses->result = scmd->result; |
12265709 | 973 | ses->underflow = scmd->underflow; |
db007fc5 | 974 | ses->prot_op = scmd->prot_op; |
8e8c9d01 | 975 | ses->eh_eflags = scmd->eh_eflags; |
631c228c | 976 | |
db007fc5 | 977 | scmd->prot_op = SCSI_PROT_NORMAL; |
c69e6f81 | 978 | scmd->eh_eflags = 0; |
64a87b24 BH |
979 | scmd->cmnd = ses->eh_cmnd; |
980 | memset(scmd->cmnd, 0, BLK_MAX_CDB); | |
30b0c37b | 981 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
6f9a35e2 | 982 | scmd->request->next_rq = NULL; |
644373a4 | 983 | scmd->result = 0; |
30b0c37b | 984 | |
55db6c1b | 985 | if (sense_bytes) { |
30b0c37b BH |
986 | scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE, |
987 | sense_bytes); | |
e1c23468 | 988 | sg_init_one(&ses->sense_sgl, scmd->sense_buffer, |
30b0c37b BH |
989 | scmd->sdb.length); |
990 | scmd->sdb.table.sgl = &ses->sense_sgl; | |
55db6c1b | 991 | scmd->sc_data_direction = DMA_FROM_DEVICE; |
0c958ecc | 992 | scmd->sdb.table.nents = scmd->sdb.table.orig_nents = 1; |
55db6c1b | 993 | scmd->cmnd[0] = REQUEST_SENSE; |
30b0c37b | 994 | scmd->cmnd[4] = scmd->sdb.length; |
55db6c1b | 995 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); |
631c228c | 996 | } else { |
631c228c | 997 | scmd->sc_data_direction = DMA_NONE; |
55db6c1b | 998 | if (cmnd) { |
64a87b24 | 999 | BUG_ON(cmnd_size > BLK_MAX_CDB); |
55db6c1b BH |
1000 | memcpy(scmd->cmnd, cmnd, cmnd_size); |
1001 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); | |
1002 | } | |
631c228c CH |
1003 | } |
1004 | ||
1005 | scmd->underflow = 0; | |
631c228c | 1006 | |
55db6c1b | 1007 | if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN) |
1da177e4 | 1008 | scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) | |
f59114b7 | 1009 | (sdev->lun << 5 & 0xe0); |
1da177e4 | 1010 | |
631c228c CH |
1011 | /* |
1012 | * Zero the sense buffer. The scsi spec mandates that any | |
1013 | * untransferred sense data should be interpreted as being zero. | |
1014 | */ | |
b80ca4f7 | 1015 | memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); |
e1c23468 BH |
1016 | } |
1017 | EXPORT_SYMBOL(scsi_eh_prep_cmnd); | |
1018 | ||
1019 | /** | |
3b729f76 | 1020 | * scsi_eh_restore_cmnd - Restore a scsi command info as part of error recovery |
e1c23468 | 1021 | * @scmd: SCSI command structure to restore |
477e608c | 1022 | * @ses: saved information from a coresponding call to scsi_eh_prep_cmnd |
e1c23468 | 1023 | * |
477e608c | 1024 | * Undo any damage done by above scsi_eh_prep_cmnd(). |
dc8875e1 | 1025 | */ |
e1c23468 BH |
1026 | void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses) |
1027 | { | |
1028 | /* | |
1029 | * Restore original data | |
1030 | */ | |
1031 | scmd->cmd_len = ses->cmd_len; | |
64a87b24 | 1032 | scmd->cmnd = ses->cmnd; |
e1c23468 | 1033 | scmd->sc_data_direction = ses->data_direction; |
30b0c37b | 1034 | scmd->sdb = ses->sdb; |
6f9a35e2 | 1035 | scmd->request->next_rq = ses->next_rq; |
e1c23468 | 1036 | scmd->result = ses->result; |
12265709 | 1037 | scmd->underflow = ses->underflow; |
db007fc5 | 1038 | scmd->prot_op = ses->prot_op; |
8e8c9d01 | 1039 | scmd->eh_eflags = ses->eh_eflags; |
e1c23468 BH |
1040 | } |
1041 | EXPORT_SYMBOL(scsi_eh_restore_cmnd); | |
631c228c | 1042 | |
e1c23468 | 1043 | /** |
3b729f76 | 1044 | * scsi_send_eh_cmnd - submit a scsi command as part of error recovery |
e1c23468 BH |
1045 | * @scmd: SCSI command structure to hijack |
1046 | * @cmnd: CDB to send | |
1047 | * @cmnd_size: size in bytes of @cmnd | |
1048 | * @timeout: timeout for this request | |
1049 | * @sense_bytes: size of sense data to copy or 0 | |
1050 | * | |
1051 | * This function is used to send a scsi command down to a target device | |
1052 | * as part of the error recovery process. See also scsi_eh_prep_cmnd() above. | |
1053 | * | |
1054 | * Return value: | |
1055 | * SUCCESS or FAILED or NEEDS_RETRY | |
dc8875e1 | 1056 | */ |
e1c23468 BH |
1057 | static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd, |
1058 | int cmnd_size, int timeout, unsigned sense_bytes) | |
1059 | { | |
1060 | struct scsi_device *sdev = scmd->device; | |
1061 | struct Scsi_Host *shost = sdev->host; | |
1062 | DECLARE_COMPLETION_ONSTACK(done); | |
fc73648a | 1063 | unsigned long timeleft = timeout; |
e1c23468 | 1064 | struct scsi_eh_save ses; |
fc73648a | 1065 | const unsigned long stall_for = msecs_to_jiffies(100); |
e1c23468 BH |
1066 | int rtn; |
1067 | ||
fc73648a | 1068 | retry: |
e1c23468 | 1069 | scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes); |
7dfdc9a5 | 1070 | shost->eh_action = &done; |
1da177e4 | 1071 | |
1da177e4 | 1072 | scsi_log_send(scmd); |
f281233d | 1073 | scmd->scsi_done = scsi_eh_done; |
fc73648a HR |
1074 | rtn = shost->hostt->queuecommand(shost, scmd); |
1075 | if (rtn) { | |
1076 | if (timeleft > stall_for) { | |
1077 | scsi_eh_restore_cmnd(scmd, &ses); | |
1078 | timeleft -= stall_for; | |
1079 | msleep(jiffies_to_msecs(stall_for)); | |
1080 | goto retry; | |
1081 | } | |
1082 | /* signal not to enter either branch of the if () below */ | |
1083 | timeleft = 0; | |
511833ac | 1084 | rtn = FAILED; |
fc73648a HR |
1085 | } else { |
1086 | timeleft = wait_for_completion_timeout(&done, timeout); | |
ac61d195 | 1087 | rtn = SUCCESS; |
fc73648a | 1088 | } |
1da177e4 | 1089 | |
f59114b7 | 1090 | shost->eh_action = NULL; |
1da177e4 | 1091 | |
fc73648a | 1092 | scsi_log_completion(scmd, rtn); |
1da177e4 | 1093 | |
91921e01 | 1094 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
470613b4 HR |
1095 | "%s timeleft: %ld\n", |
1096 | __func__, timeleft)); | |
1da177e4 LT |
1097 | |
1098 | /* | |
fc73648a HR |
1099 | * If there is time left scsi_eh_done got called, and we will examine |
1100 | * the actual status codes to see whether the command actually did | |
1101 | * complete normally, else if we have a zero return and no time left, | |
1102 | * the command must still be pending, so abort it and return FAILED. | |
1103 | * If we never actually managed to issue the command, because | |
1104 | * ->queuecommand() kept returning non zero, use the rtn = FAILED | |
1105 | * value above (so don't execute either branch of the if) | |
1da177e4 | 1106 | */ |
7dfdc9a5 | 1107 | if (timeleft) { |
1da177e4 | 1108 | rtn = scsi_eh_completed_normally(scmd); |
91921e01 HR |
1109 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
1110 | "%s: scsi_eh_completed_normally %x\n", __func__, rtn)); | |
7dfdc9a5 | 1111 | |
1da177e4 LT |
1112 | switch (rtn) { |
1113 | case SUCCESS: | |
1114 | case NEEDS_RETRY: | |
1115 | case FAILED: | |
1116 | break; | |
6e883b0e HR |
1117 | case ADD_TO_MLQUEUE: |
1118 | rtn = NEEDS_RETRY; | |
1119 | break; | |
1da177e4 LT |
1120 | default: |
1121 | rtn = FAILED; | |
1122 | break; | |
1123 | } | |
511833ac | 1124 | } else if (rtn != FAILED) { |
292148f8 | 1125 | scsi_abort_eh_cmnd(scmd); |
7dfdc9a5 | 1126 | rtn = FAILED; |
1da177e4 LT |
1127 | } |
1128 | ||
e1c23468 | 1129 | scsi_eh_restore_cmnd(scmd, &ses); |
18a4d0a2 | 1130 | |
1da177e4 LT |
1131 | return rtn; |
1132 | } | |
1133 | ||
1134 | /** | |
1135 | * scsi_request_sense - Request sense data from a particular target. | |
1136 | * @scmd: SCSI cmd for request sense. | |
1137 | * | |
1138 | * Notes: | |
1139 | * Some hosts automatically obtain this information, others require | |
1140 | * that we obtain it on our own. This function will *not* return until | |
1141 | * the command either times out, or it completes. | |
dc8875e1 | 1142 | */ |
1da177e4 LT |
1143 | static int scsi_request_sense(struct scsi_cmnd *scmd) |
1144 | { | |
0816c925 | 1145 | return scsi_send_eh_cmnd(scmd, NULL, 0, scmd->device->eh_timeout, ~0); |
1da177e4 LT |
1146 | } |
1147 | ||
2451079b JB |
1148 | static int scsi_eh_action(struct scsi_cmnd *scmd, int rtn) |
1149 | { | |
57292b58 | 1150 | if (!blk_rq_is_passthrough(scmd->request)) { |
2451079b JB |
1151 | struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd); |
1152 | if (sdrv->eh_action) | |
1153 | rtn = sdrv->eh_action(scmd, rtn); | |
1154 | } | |
1155 | return rtn; | |
1156 | } | |
1157 | ||
1da177e4 LT |
1158 | /** |
1159 | * scsi_eh_finish_cmd - Handle a cmd that eh is finished with. | |
1160 | * @scmd: Original SCSI cmd that eh has finished. | |
1161 | * @done_q: Queue for processed commands. | |
1162 | * | |
1163 | * Notes: | |
1164 | * We don't want to use the normal command completion while we are are | |
1165 | * still handling errors - it may cause other commands to be queued, | |
eb44820c | 1166 | * and that would disturb what we are doing. Thus we really want to |
1da177e4 LT |
1167 | * keep a list of pending commands for final completion, and once we |
1168 | * are ready to leave error handling we handle completion for real. | |
dc8875e1 | 1169 | */ |
041c5fc3 | 1170 | void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q) |
1da177e4 | 1171 | { |
1da177e4 LT |
1172 | list_move_tail(&scmd->eh_entry, done_q); |
1173 | } | |
041c5fc3 | 1174 | EXPORT_SYMBOL(scsi_eh_finish_cmd); |
1da177e4 LT |
1175 | |
1176 | /** | |
1177 | * scsi_eh_get_sense - Get device sense data. | |
1178 | * @work_q: Queue of commands to process. | |
eb44820c | 1179 | * @done_q: Queue of processed commands. |
1da177e4 LT |
1180 | * |
1181 | * Description: | |
1182 | * See if we need to request sense information. if so, then get it | |
0bf8c869 | 1183 | * now, so we have a better idea of what to do. |
1da177e4 LT |
1184 | * |
1185 | * Notes: | |
1186 | * This has the unfortunate side effect that if a shost adapter does | |
eb44820c | 1187 | * not automatically request sense information, we end up shutting |
1da177e4 LT |
1188 | * it down before we request it. |
1189 | * | |
1190 | * All drivers should request sense information internally these days, | |
1191 | * so for now all I have to say is tough noogies if you end up in here. | |
1192 | * | |
1193 | * XXX: Long term this code should go away, but that needs an audit of | |
1194 | * all LLDDs first. | |
dc8875e1 | 1195 | */ |
dca84e46 DW |
1196 | int scsi_eh_get_sense(struct list_head *work_q, |
1197 | struct list_head *done_q) | |
1da177e4 | 1198 | { |
937abeaa | 1199 | struct scsi_cmnd *scmd, *next; |
b4562022 | 1200 | struct Scsi_Host *shost; |
1da177e4 LT |
1201 | int rtn; |
1202 | ||
709c75b5 | 1203 | /* |
1204 | * If SCSI_EH_ABORT_SCHEDULED has been set, it is timeout IO, | |
1205 | * should not get sense. | |
1206 | */ | |
937abeaa | 1207 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
a0658632 | 1208 | if ((scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) || |
1da177e4 LT |
1209 | SCSI_SENSE_VALID(scmd)) |
1210 | continue; | |
1211 | ||
b4562022 | 1212 | shost = scmd->device->host; |
b4562022 | 1213 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 | 1214 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1215 | scmd_printk(KERN_INFO, scmd, |
1216 | "%s: skip request sense, past eh deadline\n", | |
1217 | current->comm)); | |
b4562022 HR |
1218 | break; |
1219 | } | |
d555a2ab JB |
1220 | if (status_byte(scmd->result) != CHECK_CONDITION) |
1221 | /* | |
1222 | * don't request sense if there's no check condition | |
1223 | * status because the error we're processing isn't one | |
1224 | * that has a sense code (and some devices get | |
1225 | * confused by sense requests out of the blue) | |
1226 | */ | |
1227 | continue; | |
1228 | ||
3bf743e7 JG |
1229 | SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd, |
1230 | "%s: requesting sense\n", | |
1231 | current->comm)); | |
1da177e4 LT |
1232 | rtn = scsi_request_sense(scmd); |
1233 | if (rtn != SUCCESS) | |
1234 | continue; | |
1235 | ||
91921e01 | 1236 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
470613b4 | 1237 | "sense requested, result %x\n", scmd->result)); |
d811b848 | 1238 | SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense(scmd)); |
1da177e4 LT |
1239 | |
1240 | rtn = scsi_decide_disposition(scmd); | |
1241 | ||
1242 | /* | |
1243 | * if the result was normal, then just pass it along to the | |
1244 | * upper level. | |
1245 | */ | |
1246 | if (rtn == SUCCESS) | |
1247 | /* we don't want this command reissued, just | |
1248 | * finished with the sense data, so set | |
1249 | * retries to the max allowed to ensure it | |
1250 | * won't get reissued */ | |
1251 | scmd->retries = scmd->allowed; | |
1252 | else if (rtn != NEEDS_RETRY) | |
1253 | continue; | |
1254 | ||
1255 | scsi_eh_finish_cmd(scmd, done_q); | |
1256 | } | |
1257 | ||
1258 | return list_empty(work_q); | |
1259 | } | |
dca84e46 | 1260 | EXPORT_SYMBOL_GPL(scsi_eh_get_sense); |
1da177e4 | 1261 | |
1da177e4 LT |
1262 | /** |
1263 | * scsi_eh_tur - Send TUR to device. | |
eb44820c | 1264 | * @scmd: &scsi_cmnd to send TUR |
1da177e4 LT |
1265 | * |
1266 | * Return value: | |
1267 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1268 | */ |
1da177e4 LT |
1269 | static int scsi_eh_tur(struct scsi_cmnd *scmd) |
1270 | { | |
1271 | static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0}; | |
1272 | int retry_cnt = 1, rtn; | |
1273 | ||
1274 | retry_tur: | |
0816c925 MP |
1275 | rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, |
1276 | scmd->device->eh_timeout, 0); | |
1da177e4 | 1277 | |
91921e01 | 1278 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
470613b4 | 1279 | "%s return: %x\n", __func__, rtn)); |
631c228c CH |
1280 | |
1281 | switch (rtn) { | |
1282 | case NEEDS_RETRY: | |
1da177e4 LT |
1283 | if (retry_cnt--) |
1284 | goto retry_tur; | |
631c228c CH |
1285 | /*FALLTHRU*/ |
1286 | case SUCCESS: | |
e47373ec | 1287 | return 0; |
631c228c CH |
1288 | default: |
1289 | return 1; | |
e47373ec | 1290 | } |
1da177e4 LT |
1291 | } |
1292 | ||
3eef6257 DJ |
1293 | /** |
1294 | * scsi_eh_test_devices - check if devices are responding from error recovery. | |
1295 | * @cmd_list: scsi commands in error recovery. | |
74cf298f RD |
1296 | * @work_q: queue for commands which still need more error recovery |
1297 | * @done_q: queue for commands which are finished | |
1298 | * @try_stu: boolean on if a STU command should be tried in addition to TUR. | |
3eef6257 DJ |
1299 | * |
1300 | * Decription: | |
1301 | * Tests if devices are in a working state. Commands to devices now in | |
1302 | * a working state are sent to the done_q while commands to devices which | |
1303 | * are still failing to respond are returned to the work_q for more | |
1304 | * processing. | |
1305 | **/ | |
1306 | static int scsi_eh_test_devices(struct list_head *cmd_list, | |
1307 | struct list_head *work_q, | |
1308 | struct list_head *done_q, int try_stu) | |
1309 | { | |
1310 | struct scsi_cmnd *scmd, *next; | |
1311 | struct scsi_device *sdev; | |
1312 | int finish_cmds; | |
1313 | ||
1314 | while (!list_empty(cmd_list)) { | |
1315 | scmd = list_entry(cmd_list->next, struct scsi_cmnd, eh_entry); | |
1316 | sdev = scmd->device; | |
1317 | ||
b4562022 | 1318 | if (!try_stu) { |
b4562022 HR |
1319 | if (scsi_host_eh_past_deadline(sdev->host)) { |
1320 | /* Push items back onto work_q */ | |
1321 | list_splice_init(cmd_list, work_q); | |
b4562022 | 1322 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1323 | sdev_printk(KERN_INFO, sdev, |
1324 | "%s: skip test device, past eh deadline", | |
1325 | current->comm)); | |
b4562022 HR |
1326 | break; |
1327 | } | |
b4562022 HR |
1328 | } |
1329 | ||
3eef6257 DJ |
1330 | finish_cmds = !scsi_device_online(scmd->device) || |
1331 | (try_stu && !scsi_eh_try_stu(scmd) && | |
1332 | !scsi_eh_tur(scmd)) || | |
1333 | !scsi_eh_tur(scmd); | |
1334 | ||
1335 | list_for_each_entry_safe(scmd, next, cmd_list, eh_entry) | |
1336 | if (scmd->device == sdev) { | |
2451079b JB |
1337 | if (finish_cmds && |
1338 | (try_stu || | |
1339 | scsi_eh_action(scmd, SUCCESS) == SUCCESS)) | |
3eef6257 DJ |
1340 | scsi_eh_finish_cmd(scmd, done_q); |
1341 | else | |
1342 | list_move_tail(&scmd->eh_entry, work_q); | |
1343 | } | |
1344 | } | |
1345 | return list_empty(work_q); | |
1346 | } | |
1347 | ||
1da177e4 LT |
1348 | /** |
1349 | * scsi_eh_try_stu - Send START_UNIT to device. | |
eb44820c | 1350 | * @scmd: &scsi_cmnd to send START_UNIT |
1da177e4 LT |
1351 | * |
1352 | * Return value: | |
1353 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1354 | */ |
1da177e4 LT |
1355 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd) |
1356 | { | |
1357 | static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0}; | |
1da177e4 | 1358 | |
631c228c | 1359 | if (scmd->device->allow_restart) { |
ed773e66 BK |
1360 | int i, rtn = NEEDS_RETRY; |
1361 | ||
1362 | for (i = 0; rtn == NEEDS_RETRY && i < 2; i++) | |
9728c081 | 1363 | rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0); |
1da177e4 | 1364 | |
631c228c CH |
1365 | if (rtn == SUCCESS) |
1366 | return 0; | |
1367 | } | |
1da177e4 | 1368 | |
1da177e4 LT |
1369 | return 1; |
1370 | } | |
1371 | ||
1372 | /** | |
1373 | * scsi_eh_stu - send START_UNIT if needed | |
eb44820c | 1374 | * @shost: &scsi host being recovered. |
74cf298f | 1375 | * @work_q: &list_head for pending commands. |
eb44820c | 1376 | * @done_q: &list_head for processed commands. |
1da177e4 LT |
1377 | * |
1378 | * Notes: | |
1379 | * If commands are failing due to not ready, initializing command required, | |
0bf8c869 | 1380 | * try revalidating the device, which will end up sending a start unit. |
dc8875e1 | 1381 | */ |
1da177e4 LT |
1382 | static int scsi_eh_stu(struct Scsi_Host *shost, |
1383 | struct list_head *work_q, | |
1384 | struct list_head *done_q) | |
1385 | { | |
937abeaa | 1386 | struct scsi_cmnd *scmd, *stu_scmd, *next; |
1da177e4 LT |
1387 | struct scsi_device *sdev; |
1388 | ||
1389 | shost_for_each_device(sdev, shost) { | |
b4562022 | 1390 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 | 1391 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1392 | sdev_printk(KERN_INFO, sdev, |
1393 | "%s: skip START_UNIT, past eh deadline\n", | |
1394 | current->comm)); | |
b4562022 HR |
1395 | break; |
1396 | } | |
1da177e4 LT |
1397 | stu_scmd = NULL; |
1398 | list_for_each_entry(scmd, work_q, eh_entry) | |
1399 | if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) && | |
1400 | scsi_check_sense(scmd) == FAILED ) { | |
1401 | stu_scmd = scmd; | |
1402 | break; | |
1403 | } | |
1404 | ||
1405 | if (!stu_scmd) | |
1406 | continue; | |
1407 | ||
91921e01 | 1408 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1409 | sdev_printk(KERN_INFO, sdev, |
1410 | "%s: Sending START_UNIT\n", | |
1411 | current->comm)); | |
1da177e4 LT |
1412 | |
1413 | if (!scsi_eh_try_stu(stu_scmd)) { | |
1414 | if (!scsi_device_online(sdev) || | |
1415 | !scsi_eh_tur(stu_scmd)) { | |
937abeaa CH |
1416 | list_for_each_entry_safe(scmd, next, |
1417 | work_q, eh_entry) { | |
2451079b JB |
1418 | if (scmd->device == sdev && |
1419 | scsi_eh_action(scmd, SUCCESS) == SUCCESS) | |
1da177e4 LT |
1420 | scsi_eh_finish_cmd(scmd, done_q); |
1421 | } | |
1422 | } | |
1423 | } else { | |
1424 | SCSI_LOG_ERROR_RECOVERY(3, | |
a222b1e2 HR |
1425 | sdev_printk(KERN_INFO, sdev, |
1426 | "%s: START_UNIT failed\n", | |
1427 | current->comm)); | |
1da177e4 LT |
1428 | } |
1429 | } | |
1430 | ||
1431 | return list_empty(work_q); | |
1432 | } | |
1433 | ||
1434 | ||
1435 | /** | |
1436 | * scsi_eh_bus_device_reset - send bdr if needed | |
1437 | * @shost: scsi host being recovered. | |
74cf298f | 1438 | * @work_q: &list_head for pending commands. |
eb44820c | 1439 | * @done_q: &list_head for processed commands. |
1da177e4 LT |
1440 | * |
1441 | * Notes: | |
eb44820c | 1442 | * Try a bus device reset. Still, look to see whether we have multiple |
1da177e4 LT |
1443 | * devices that are jammed or not - if we have multiple devices, it |
1444 | * makes no sense to try bus_device_reset - we really would need to try | |
0bf8c869 | 1445 | * a bus_reset instead. |
dc8875e1 | 1446 | */ |
1da177e4 LT |
1447 | static int scsi_eh_bus_device_reset(struct Scsi_Host *shost, |
1448 | struct list_head *work_q, | |
1449 | struct list_head *done_q) | |
1450 | { | |
937abeaa | 1451 | struct scsi_cmnd *scmd, *bdr_scmd, *next; |
1da177e4 LT |
1452 | struct scsi_device *sdev; |
1453 | int rtn; | |
1454 | ||
1455 | shost_for_each_device(sdev, shost) { | |
b4562022 | 1456 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 | 1457 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1458 | sdev_printk(KERN_INFO, sdev, |
1459 | "%s: skip BDR, past eh deadline\n", | |
1460 | current->comm)); | |
b4562022 HR |
1461 | break; |
1462 | } | |
1da177e4 LT |
1463 | bdr_scmd = NULL; |
1464 | list_for_each_entry(scmd, work_q, eh_entry) | |
1465 | if (scmd->device == sdev) { | |
1466 | bdr_scmd = scmd; | |
1467 | break; | |
1468 | } | |
1469 | ||
1470 | if (!bdr_scmd) | |
1471 | continue; | |
1472 | ||
91921e01 | 1473 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1474 | sdev_printk(KERN_INFO, sdev, |
1475 | "%s: Sending BDR\n", current->comm)); | |
1da177e4 | 1476 | rtn = scsi_try_bus_device_reset(bdr_scmd); |
2f2eb587 | 1477 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
1da177e4 | 1478 | if (!scsi_device_online(sdev) || |
2f2eb587 | 1479 | rtn == FAST_IO_FAIL || |
1da177e4 | 1480 | !scsi_eh_tur(bdr_scmd)) { |
937abeaa CH |
1481 | list_for_each_entry_safe(scmd, next, |
1482 | work_q, eh_entry) { | |
2451079b JB |
1483 | if (scmd->device == sdev && |
1484 | scsi_eh_action(scmd, rtn) != FAILED) | |
1da177e4 LT |
1485 | scsi_eh_finish_cmd(scmd, |
1486 | done_q); | |
1487 | } | |
1488 | } | |
1489 | } else { | |
91921e01 | 1490 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1491 | sdev_printk(KERN_INFO, sdev, |
1492 | "%s: BDR failed\n", current->comm)); | |
1da177e4 LT |
1493 | } |
1494 | } | |
1495 | ||
1496 | return list_empty(work_q); | |
1497 | } | |
1498 | ||
30bd7df8 MC |
1499 | /** |
1500 | * scsi_eh_target_reset - send target reset if needed | |
1501 | * @shost: scsi host being recovered. | |
74cf298f | 1502 | * @work_q: &list_head for pending commands. |
30bd7df8 MC |
1503 | * @done_q: &list_head for processed commands. |
1504 | * | |
1505 | * Notes: | |
1506 | * Try a target reset. | |
1507 | */ | |
1508 | static int scsi_eh_target_reset(struct Scsi_Host *shost, | |
1509 | struct list_head *work_q, | |
1510 | struct list_head *done_q) | |
1511 | { | |
98db5195 | 1512 | LIST_HEAD(tmp_list); |
3eef6257 | 1513 | LIST_HEAD(check_list); |
30bd7df8 | 1514 | |
98db5195 JB |
1515 | list_splice_init(work_q, &tmp_list); |
1516 | ||
1517 | while (!list_empty(&tmp_list)) { | |
1518 | struct scsi_cmnd *next, *scmd; | |
1519 | int rtn; | |
1520 | unsigned int id; | |
b4562022 | 1521 | |
b4562022 | 1522 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 HR |
1523 | /* push back on work queue for further processing */ |
1524 | list_splice_init(&check_list, work_q); | |
1525 | list_splice_init(&tmp_list, work_q); | |
1526 | SCSI_LOG_ERROR_RECOVERY(3, | |
1527 | shost_printk(KERN_INFO, shost, | |
a222b1e2 HR |
1528 | "%s: Skip target reset, past eh deadline\n", |
1529 | current->comm)); | |
b4562022 HR |
1530 | return list_empty(work_q); |
1531 | } | |
98db5195 JB |
1532 | |
1533 | scmd = list_entry(tmp_list.next, struct scsi_cmnd, eh_entry); | |
1534 | id = scmd_id(scmd); | |
30bd7df8 | 1535 | |
91921e01 HR |
1536 | SCSI_LOG_ERROR_RECOVERY(3, |
1537 | shost_printk(KERN_INFO, shost, | |
1538 | "%s: Sending target reset to target %d\n", | |
1539 | current->comm, id)); | |
98db5195 JB |
1540 | rtn = scsi_try_target_reset(scmd); |
1541 | if (rtn != SUCCESS && rtn != FAST_IO_FAIL) | |
91921e01 HR |
1542 | SCSI_LOG_ERROR_RECOVERY(3, |
1543 | shost_printk(KERN_INFO, shost, | |
1544 | "%s: Target reset failed" | |
1545 | " target: %d\n", | |
1546 | current->comm, id)); | |
98db5195 JB |
1547 | list_for_each_entry_safe(scmd, next, &tmp_list, eh_entry) { |
1548 | if (scmd_id(scmd) != id) | |
1549 | continue; | |
1550 | ||
3eef6257 DJ |
1551 | if (rtn == SUCCESS) |
1552 | list_move_tail(&scmd->eh_entry, &check_list); | |
1553 | else if (rtn == FAST_IO_FAIL) | |
98db5195 JB |
1554 | scsi_eh_finish_cmd(scmd, done_q); |
1555 | else | |
1556 | /* push back on work queue for further processing */ | |
1557 | list_move(&scmd->eh_entry, work_q); | |
1558 | } | |
1559 | } | |
30bd7df8 | 1560 | |
3eef6257 | 1561 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
30bd7df8 MC |
1562 | } |
1563 | ||
1da177e4 | 1564 | /** |
0bf8c869 | 1565 | * scsi_eh_bus_reset - send a bus reset |
eb44820c | 1566 | * @shost: &scsi host being recovered. |
74cf298f | 1567 | * @work_q: &list_head for pending commands. |
eb44820c | 1568 | * @done_q: &list_head for processed commands. |
dc8875e1 | 1569 | */ |
1da177e4 LT |
1570 | static int scsi_eh_bus_reset(struct Scsi_Host *shost, |
1571 | struct list_head *work_q, | |
1572 | struct list_head *done_q) | |
1573 | { | |
937abeaa | 1574 | struct scsi_cmnd *scmd, *chan_scmd, *next; |
3eef6257 | 1575 | LIST_HEAD(check_list); |
1da177e4 LT |
1576 | unsigned int channel; |
1577 | int rtn; | |
1578 | ||
1579 | /* | |
1580 | * we really want to loop over the various channels, and do this on | |
1581 | * a channel by channel basis. we should also check to see if any | |
1582 | * of the failed commands are on soft_reset devices, and if so, skip | |
0bf8c869 | 1583 | * the reset. |
1da177e4 LT |
1584 | */ |
1585 | ||
1586 | for (channel = 0; channel <= shost->max_channel; channel++) { | |
b4562022 | 1587 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 HR |
1588 | list_splice_init(&check_list, work_q); |
1589 | SCSI_LOG_ERROR_RECOVERY(3, | |
1590 | shost_printk(KERN_INFO, shost, | |
a222b1e2 HR |
1591 | "%s: skip BRST, past eh deadline\n", |
1592 | current->comm)); | |
b4562022 HR |
1593 | return list_empty(work_q); |
1594 | } | |
b4562022 | 1595 | |
1da177e4 LT |
1596 | chan_scmd = NULL; |
1597 | list_for_each_entry(scmd, work_q, eh_entry) { | |
422c0d61 | 1598 | if (channel == scmd_channel(scmd)) { |
1da177e4 LT |
1599 | chan_scmd = scmd; |
1600 | break; | |
1601 | /* | |
1602 | * FIXME add back in some support for | |
1603 | * soft_reset devices. | |
1604 | */ | |
1605 | } | |
1606 | } | |
1607 | ||
1608 | if (!chan_scmd) | |
1609 | continue; | |
91921e01 HR |
1610 | SCSI_LOG_ERROR_RECOVERY(3, |
1611 | shost_printk(KERN_INFO, shost, | |
1612 | "%s: Sending BRST chan: %d\n", | |
1613 | current->comm, channel)); | |
1da177e4 | 1614 | rtn = scsi_try_bus_reset(chan_scmd); |
2f2eb587 | 1615 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
937abeaa | 1616 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3eef6257 DJ |
1617 | if (channel == scmd_channel(scmd)) { |
1618 | if (rtn == FAST_IO_FAIL) | |
1da177e4 LT |
1619 | scsi_eh_finish_cmd(scmd, |
1620 | done_q); | |
3eef6257 DJ |
1621 | else |
1622 | list_move_tail(&scmd->eh_entry, | |
1623 | &check_list); | |
1624 | } | |
1da177e4 LT |
1625 | } |
1626 | } else { | |
91921e01 HR |
1627 | SCSI_LOG_ERROR_RECOVERY(3, |
1628 | shost_printk(KERN_INFO, shost, | |
1629 | "%s: BRST failed chan: %d\n", | |
1630 | current->comm, channel)); | |
1da177e4 LT |
1631 | } |
1632 | } | |
3eef6257 | 1633 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4 LT |
1634 | } |
1635 | ||
1636 | /** | |
0bf8c869 | 1637 | * scsi_eh_host_reset - send a host reset |
74cf298f RD |
1638 | * @shost: host to be reset. |
1639 | * @work_q: &list_head for pending commands. | |
1640 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1641 | */ |
91921e01 HR |
1642 | static int scsi_eh_host_reset(struct Scsi_Host *shost, |
1643 | struct list_head *work_q, | |
1da177e4 LT |
1644 | struct list_head *done_q) |
1645 | { | |
937abeaa | 1646 | struct scsi_cmnd *scmd, *next; |
3eef6257 | 1647 | LIST_HEAD(check_list); |
1da177e4 | 1648 | int rtn; |
1da177e4 LT |
1649 | |
1650 | if (!list_empty(work_q)) { | |
1651 | scmd = list_entry(work_q->next, | |
1652 | struct scsi_cmnd, eh_entry); | |
1653 | ||
91921e01 HR |
1654 | SCSI_LOG_ERROR_RECOVERY(3, |
1655 | shost_printk(KERN_INFO, shost, | |
1656 | "%s: Sending HRST\n", | |
1657 | current->comm)); | |
1da177e4 LT |
1658 | |
1659 | rtn = scsi_try_host_reset(scmd); | |
3eef6257 DJ |
1660 | if (rtn == SUCCESS) { |
1661 | list_splice_init(work_q, &check_list); | |
1662 | } else if (rtn == FAST_IO_FAIL) { | |
937abeaa | 1663 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1da177e4 LT |
1664 | scsi_eh_finish_cmd(scmd, done_q); |
1665 | } | |
1666 | } else { | |
91921e01 HR |
1667 | SCSI_LOG_ERROR_RECOVERY(3, |
1668 | shost_printk(KERN_INFO, shost, | |
1669 | "%s: HRST failed\n", | |
1670 | current->comm)); | |
1da177e4 LT |
1671 | } |
1672 | } | |
3eef6257 | 1673 | return scsi_eh_test_devices(&check_list, work_q, done_q, 1); |
1da177e4 LT |
1674 | } |
1675 | ||
1676 | /** | |
1677 | * scsi_eh_offline_sdevs - offline scsi devices that fail to recover | |
74cf298f RD |
1678 | * @work_q: &list_head for pending commands. |
1679 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1680 | */ |
1da177e4 LT |
1681 | static void scsi_eh_offline_sdevs(struct list_head *work_q, |
1682 | struct list_head *done_q) | |
1683 | { | |
937abeaa | 1684 | struct scsi_cmnd *scmd, *next; |
0db6ca8a | 1685 | struct scsi_device *sdev; |
1da177e4 | 1686 | |
937abeaa | 1687 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
31765d7d MW |
1688 | sdev_printk(KERN_INFO, scmd->device, "Device offlined - " |
1689 | "not ready after error recovery\n"); | |
0db6ca8a BVA |
1690 | sdev = scmd->device; |
1691 | ||
1692 | mutex_lock(&sdev->state_mutex); | |
1693 | scsi_device_set_state(sdev, SDEV_OFFLINE); | |
1694 | mutex_unlock(&sdev->state_mutex); | |
1695 | ||
1da177e4 LT |
1696 | scsi_eh_finish_cmd(scmd, done_q); |
1697 | } | |
1698 | return; | |
1699 | } | |
1700 | ||
4a27446f | 1701 | /** |
e494f6a7 | 1702 | * scsi_noretry_cmd - determine if command should be failed fast |
4a27446f MC |
1703 | * @scmd: SCSI cmd to examine. |
1704 | */ | |
1705 | int scsi_noretry_cmd(struct scsi_cmnd *scmd) | |
1706 | { | |
1707 | switch (host_byte(scmd->result)) { | |
1708 | case DID_OK: | |
1709 | break; | |
e494f6a7 HR |
1710 | case DID_TIME_OUT: |
1711 | goto check_type; | |
4a27446f | 1712 | case DID_BUS_BUSY: |
33659ebb | 1713 | return (scmd->request->cmd_flags & REQ_FAILFAST_TRANSPORT); |
4a27446f | 1714 | case DID_PARITY: |
33659ebb | 1715 | return (scmd->request->cmd_flags & REQ_FAILFAST_DEV); |
4a27446f MC |
1716 | case DID_ERROR: |
1717 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1718 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1719 | return 0; | |
1720 | /* fall through */ | |
1721 | case DID_SOFT_ERROR: | |
33659ebb | 1722 | return (scmd->request->cmd_flags & REQ_FAILFAST_DRIVER); |
4a27446f MC |
1723 | } |
1724 | ||
e494f6a7 HR |
1725 | if (status_byte(scmd->result) != CHECK_CONDITION) |
1726 | return 0; | |
4a27446f | 1727 | |
e494f6a7 HR |
1728 | check_type: |
1729 | /* | |
1730 | * assume caller has checked sense and determined | |
1731 | * the check condition was retryable. | |
1732 | */ | |
1733 | if (scmd->request->cmd_flags & REQ_FAILFAST_DEV || | |
57292b58 | 1734 | blk_rq_is_passthrough(scmd->request)) |
e494f6a7 HR |
1735 | return 1; |
1736 | else | |
1737 | return 0; | |
4a27446f MC |
1738 | } |
1739 | ||
1da177e4 LT |
1740 | /** |
1741 | * scsi_decide_disposition - Disposition a cmd on return from LLD. | |
1742 | * @scmd: SCSI cmd to examine. | |
1743 | * | |
1744 | * Notes: | |
1745 | * This is *only* called when we are examining the status after sending | |
1746 | * out the actual data command. any commands that are queued for error | |
1747 | * recovery (e.g. test_unit_ready) do *not* come through here. | |
1748 | * | |
1749 | * When this routine returns failed, it means the error handler thread | |
1750 | * is woken. In cases where the error code indicates an error that | |
1751 | * doesn't require the error handler read (i.e. we don't need to | |
1752 | * abort/reset), this function should return SUCCESS. | |
dc8875e1 | 1753 | */ |
1da177e4 LT |
1754 | int scsi_decide_disposition(struct scsi_cmnd *scmd) |
1755 | { | |
1756 | int rtn; | |
1757 | ||
1758 | /* | |
1759 | * if the device is offline, then we clearly just pass the result back | |
1760 | * up to the top level. | |
1761 | */ | |
1762 | if (!scsi_device_online(scmd->device)) { | |
91921e01 HR |
1763 | SCSI_LOG_ERROR_RECOVERY(5, scmd_printk(KERN_INFO, scmd, |
1764 | "%s: device offline - report as SUCCESS\n", __func__)); | |
1da177e4 LT |
1765 | return SUCCESS; |
1766 | } | |
1767 | ||
1768 | /* | |
1769 | * first check the host byte, to see if there is anything in there | |
1770 | * that would indicate what we need to do. | |
1771 | */ | |
1772 | switch (host_byte(scmd->result)) { | |
1773 | case DID_PASSTHROUGH: | |
1774 | /* | |
1775 | * no matter what, pass this through to the upper layer. | |
1776 | * nuke this special code so that it looks like we are saying | |
1777 | * did_ok. | |
1778 | */ | |
1779 | scmd->result &= 0xff00ffff; | |
1780 | return SUCCESS; | |
1781 | case DID_OK: | |
1782 | /* | |
1783 | * looks good. drop through, and check the next byte. | |
1784 | */ | |
1785 | break; | |
e494f6a7 HR |
1786 | case DID_ABORT: |
1787 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) { | |
8922a908 | 1788 | set_host_byte(scmd, DID_TIME_OUT); |
e494f6a7 HR |
1789 | return SUCCESS; |
1790 | } | |
3bf2ff67 | 1791 | /* FALLTHROUGH */ |
1da177e4 LT |
1792 | case DID_NO_CONNECT: |
1793 | case DID_BAD_TARGET: | |
1da177e4 LT |
1794 | /* |
1795 | * note - this means that we just report the status back | |
1796 | * to the top level driver, not that we actually think | |
1797 | * that it indicates SUCCESS. | |
1798 | */ | |
1799 | return SUCCESS; | |
ad95028a | 1800 | case DID_SOFT_ERROR: |
1da177e4 LT |
1801 | /* |
1802 | * when the low level driver returns did_soft_error, | |
0bf8c869 | 1803 | * it is responsible for keeping an internal retry counter |
1da177e4 | 1804 | * in order to avoid endless loops (db) |
1da177e4 | 1805 | */ |
1da177e4 LT |
1806 | goto maybe_retry; |
1807 | case DID_IMM_RETRY: | |
1808 | return NEEDS_RETRY; | |
1809 | ||
bf341919 | 1810 | case DID_REQUEUE: |
1811 | return ADD_TO_MLQUEUE; | |
a4dfaa6f MC |
1812 | case DID_TRANSPORT_DISRUPTED: |
1813 | /* | |
1814 | * LLD/transport was disrupted during processing of the IO. | |
1815 | * The transport class is now blocked/blocking, | |
1816 | * and the transport will decide what to do with the IO | |
939c2288 MC |
1817 | * based on its timers and recovery capablilities if |
1818 | * there are enough retries. | |
a4dfaa6f | 1819 | */ |
939c2288 | 1820 | goto maybe_retry; |
a4dfaa6f MC |
1821 | case DID_TRANSPORT_FAILFAST: |
1822 | /* | |
1823 | * The transport decided to failfast the IO (most likely | |
1824 | * the fast io fail tmo fired), so send IO directly upwards. | |
1825 | */ | |
1826 | return SUCCESS; | |
1da177e4 LT |
1827 | case DID_ERROR: |
1828 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1829 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1830 | /* | |
1831 | * execute reservation conflict processing code | |
1832 | * lower down | |
1833 | */ | |
1834 | break; | |
1835 | /* fallthrough */ | |
1da177e4 LT |
1836 | case DID_BUS_BUSY: |
1837 | case DID_PARITY: | |
1838 | goto maybe_retry; | |
1839 | case DID_TIME_OUT: | |
1840 | /* | |
1841 | * when we scan the bus, we get timeout messages for | |
1842 | * these commands if there is no device available. | |
1843 | * other hosts report did_no_connect for the same thing. | |
1844 | */ | |
1845 | if ((scmd->cmnd[0] == TEST_UNIT_READY || | |
1846 | scmd->cmnd[0] == INQUIRY)) { | |
1847 | return SUCCESS; | |
1848 | } else { | |
1849 | return FAILED; | |
1850 | } | |
1851 | case DID_RESET: | |
1852 | return SUCCESS; | |
1853 | default: | |
1854 | return FAILED; | |
1855 | } | |
1856 | ||
1857 | /* | |
1858 | * next, check the message byte. | |
1859 | */ | |
1860 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
1861 | return FAILED; | |
1862 | ||
1863 | /* | |
1864 | * check the status byte to see if this indicates anything special. | |
1865 | */ | |
1866 | switch (status_byte(scmd->result)) { | |
1867 | case QUEUE_FULL: | |
42a6a918 | 1868 | scsi_handle_queue_full(scmd->device); |
1da177e4 LT |
1869 | /* |
1870 | * the case of trying to send too many commands to a | |
1871 | * tagged queueing device. | |
1872 | */ | |
3bf2ff67 | 1873 | /* FALLTHROUGH */ |
1da177e4 LT |
1874 | case BUSY: |
1875 | /* | |
1876 | * device can't talk to us at the moment. Should only | |
1877 | * occur (SAM-3) when the task queue is empty, so will cause | |
1878 | * the empty queue handling to trigger a stall in the | |
1879 | * device. | |
1880 | */ | |
1881 | return ADD_TO_MLQUEUE; | |
1882 | case GOOD: | |
279afdfe EM |
1883 | if (scmd->cmnd[0] == REPORT_LUNS) |
1884 | scmd->device->sdev_target->expecting_lun_change = 0; | |
4a84067d | 1885 | scsi_handle_queue_ramp_up(scmd->device); |
3bf2ff67 | 1886 | /* FALLTHROUGH */ |
1da177e4 | 1887 | case COMMAND_TERMINATED: |
1da177e4 | 1888 | return SUCCESS; |
a9b589d9 VB |
1889 | case TASK_ABORTED: |
1890 | goto maybe_retry; | |
1da177e4 LT |
1891 | case CHECK_CONDITION: |
1892 | rtn = scsi_check_sense(scmd); | |
1893 | if (rtn == NEEDS_RETRY) | |
1894 | goto maybe_retry; | |
1895 | /* if rtn == FAILED, we have no sense information; | |
1896 | * returning FAILED will wake the error handler thread | |
1897 | * to collect the sense and redo the decide | |
1898 | * disposition */ | |
1899 | return rtn; | |
1900 | case CONDITION_GOOD: | |
1901 | case INTERMEDIATE_GOOD: | |
1902 | case INTERMEDIATE_C_GOOD: | |
1903 | case ACA_ACTIVE: | |
1904 | /* | |
1905 | * who knows? FIXME(eric) | |
1906 | */ | |
1907 | return SUCCESS; | |
1908 | ||
1909 | case RESERVATION_CONFLICT: | |
9ccfc756 JB |
1910 | sdev_printk(KERN_INFO, scmd->device, |
1911 | "reservation conflict\n"); | |
2082ebc4 | 1912 | set_host_byte(scmd, DID_NEXUS_FAILURE); |
1da177e4 LT |
1913 | return SUCCESS; /* causes immediate i/o error */ |
1914 | default: | |
1915 | return FAILED; | |
1916 | } | |
1917 | return FAILED; | |
1918 | ||
8ef7fe4b | 1919 | maybe_retry: |
1da177e4 LT |
1920 | |
1921 | /* we requeue for retry because the error was retryable, and | |
1922 | * the request was not marked fast fail. Note that above, | |
1923 | * even if the request is marked fast fail, we still requeue | |
1924 | * for queue congestion conditions (QUEUE_FULL or BUSY) */ | |
8884efab | 1925 | if ((++scmd->retries) <= scmd->allowed |
4a27446f | 1926 | && !scsi_noretry_cmd(scmd)) { |
1da177e4 LT |
1927 | return NEEDS_RETRY; |
1928 | } else { | |
1929 | /* | |
1930 | * no more retries - report this one back to upper level. | |
1931 | */ | |
1932 | return SUCCESS; | |
1933 | } | |
1934 | } | |
1935 | ||
2a842aca | 1936 | static void eh_lock_door_done(struct request *req, blk_status_t status) |
f078727b FT |
1937 | { |
1938 | __blk_put_request(req->q, req); | |
1939 | } | |
1940 | ||
1da177e4 LT |
1941 | /** |
1942 | * scsi_eh_lock_door - Prevent medium removal for the specified device | |
1943 | * @sdev: SCSI device to prevent medium removal | |
1944 | * | |
1945 | * Locking: | |
91bc31fb | 1946 | * We must be called from process context. |
1da177e4 LT |
1947 | * |
1948 | * Notes: | |
1949 | * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the | |
1950 | * head of the devices request queue, and continue. | |
dc8875e1 | 1951 | */ |
1da177e4 LT |
1952 | static void scsi_eh_lock_door(struct scsi_device *sdev) |
1953 | { | |
f078727b | 1954 | struct request *req; |
82ed4db4 | 1955 | struct scsi_request *rq; |
1da177e4 | 1956 | |
ff005a06 | 1957 | req = blk_get_request(sdev->request_queue, REQ_OP_SCSI_IN, 0); |
a492f075 | 1958 | if (IS_ERR(req)) |
eb571eea | 1959 | return; |
82ed4db4 | 1960 | rq = scsi_req(req); |
1da177e4 | 1961 | |
82ed4db4 CH |
1962 | rq->cmd[0] = ALLOW_MEDIUM_REMOVAL; |
1963 | rq->cmd[1] = 0; | |
1964 | rq->cmd[2] = 0; | |
1965 | rq->cmd[3] = 0; | |
1966 | rq->cmd[4] = SCSI_REMOVAL_PREVENT; | |
1967 | rq->cmd[5] = 0; | |
1968 | rq->cmd_len = COMMAND_SIZE(rq->cmd[0]); | |
f078727b | 1969 | |
e8064021 | 1970 | req->rq_flags |= RQF_QUIET; |
f078727b | 1971 | req->timeout = 10 * HZ; |
64c7f1d1 | 1972 | rq->retries = 5; |
f078727b FT |
1973 | |
1974 | blk_execute_rq_nowait(req->q, NULL, req, 1, eh_lock_door_done); | |
1975 | } | |
1da177e4 LT |
1976 | |
1977 | /** | |
1978 | * scsi_restart_operations - restart io operations to the specified host. | |
1979 | * @shost: Host we are restarting. | |
1980 | * | |
1981 | * Notes: | |
1982 | * When we entered the error handler, we blocked all further i/o to | |
1983 | * this device. we need to 'reverse' this process. | |
dc8875e1 | 1984 | */ |
1da177e4 LT |
1985 | static void scsi_restart_operations(struct Scsi_Host *shost) |
1986 | { | |
1987 | struct scsi_device *sdev; | |
939647ee | 1988 | unsigned long flags; |
1da177e4 LT |
1989 | |
1990 | /* | |
1991 | * If the door was locked, we need to insert a door lock request | |
1992 | * onto the head of the SCSI request queue for the device. There | |
1993 | * is no point trying to lock the door of an off-line device. | |
1994 | */ | |
1995 | shost_for_each_device(sdev, shost) { | |
48379270 | 1996 | if (scsi_device_online(sdev) && sdev->was_reset && sdev->locked) { |
1da177e4 | 1997 | scsi_eh_lock_door(sdev); |
48379270 CH |
1998 | sdev->was_reset = 0; |
1999 | } | |
1da177e4 LT |
2000 | } |
2001 | ||
2002 | /* | |
2003 | * next free up anything directly waiting upon the host. this | |
2004 | * will be requests for character device operations, and also for | |
2005 | * ioctls to queued block devices. | |
2006 | */ | |
b4562022 | 2007 | SCSI_LOG_ERROR_RECOVERY(3, |
91921e01 | 2008 | shost_printk(KERN_INFO, shost, "waking up host to restart\n")); |
1da177e4 | 2009 | |
939647ee JB |
2010 | spin_lock_irqsave(shost->host_lock, flags); |
2011 | if (scsi_host_set_state(shost, SHOST_RUNNING)) | |
2012 | if (scsi_host_set_state(shost, SHOST_CANCEL)) | |
2013 | BUG_ON(scsi_host_set_state(shost, SHOST_DEL)); | |
2014 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
2015 | |
2016 | wake_up(&shost->host_wait); | |
2017 | ||
2018 | /* | |
2019 | * finally we need to re-initiate requests that may be pending. we will | |
2020 | * have had everything blocked while error handling is taking place, and | |
2021 | * now that error recovery is done, we will need to ensure that these | |
2022 | * requests are started. | |
2023 | */ | |
2024 | scsi_run_host_queues(shost); | |
57fc2e33 DW |
2025 | |
2026 | /* | |
2027 | * if eh is active and host_eh_scheduled is pending we need to re-run | |
2028 | * recovery. we do this check after scsi_run_host_queues() to allow | |
2029 | * everything pent up since the last eh run a chance to make forward | |
2030 | * progress before we sync again. Either we'll immediately re-run | |
2031 | * recovery or scsi_device_unbusy() will wake us again when these | |
2032 | * pending commands complete. | |
2033 | */ | |
2034 | spin_lock_irqsave(shost->host_lock, flags); | |
2035 | if (shost->host_eh_scheduled) | |
2036 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) | |
2037 | WARN_ON(scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)); | |
2038 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
2039 | } |
2040 | ||
2041 | /** | |
2042 | * scsi_eh_ready_devs - check device ready state and recover if not. | |
74cf298f RD |
2043 | * @shost: host to be recovered. |
2044 | * @work_q: &list_head for pending commands. | |
eb44820c | 2045 | * @done_q: &list_head for processed commands. |
dc8875e1 | 2046 | */ |
dca84e46 DW |
2047 | void scsi_eh_ready_devs(struct Scsi_Host *shost, |
2048 | struct list_head *work_q, | |
2049 | struct list_head *done_q) | |
1da177e4 LT |
2050 | { |
2051 | if (!scsi_eh_stu(shost, work_q, done_q)) | |
2052 | if (!scsi_eh_bus_device_reset(shost, work_q, done_q)) | |
30bd7df8 MC |
2053 | if (!scsi_eh_target_reset(shost, work_q, done_q)) |
2054 | if (!scsi_eh_bus_reset(shost, work_q, done_q)) | |
91921e01 | 2055 | if (!scsi_eh_host_reset(shost, work_q, done_q)) |
30bd7df8 MC |
2056 | scsi_eh_offline_sdevs(work_q, |
2057 | done_q); | |
1da177e4 | 2058 | } |
dca84e46 | 2059 | EXPORT_SYMBOL_GPL(scsi_eh_ready_devs); |
1da177e4 LT |
2060 | |
2061 | /** | |
2062 | * scsi_eh_flush_done_q - finish processed commands or retry them. | |
2063 | * @done_q: list_head of processed commands. | |
dc8875e1 | 2064 | */ |
041c5fc3 | 2065 | void scsi_eh_flush_done_q(struct list_head *done_q) |
1da177e4 | 2066 | { |
937abeaa | 2067 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 2068 | |
937abeaa CH |
2069 | list_for_each_entry_safe(scmd, next, done_q, eh_entry) { |
2070 | list_del_init(&scmd->eh_entry); | |
1da177e4 | 2071 | if (scsi_device_online(scmd->device) && |
4a27446f | 2072 | !scsi_noretry_cmd(scmd) && |
8884efab | 2073 | (++scmd->retries <= scmd->allowed)) { |
91921e01 HR |
2074 | SCSI_LOG_ERROR_RECOVERY(3, |
2075 | scmd_printk(KERN_INFO, scmd, | |
470613b4 HR |
2076 | "%s: flush retry cmd\n", |
2077 | current->comm)); | |
1da177e4 LT |
2078 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); |
2079 | } else { | |
793698ce PM |
2080 | /* |
2081 | * If just we got sense for the device (called | |
2082 | * scsi_eh_get_sense), scmd->result is already | |
2083 | * set, do not set DRIVER_TIMEOUT. | |
2084 | */ | |
1da177e4 LT |
2085 | if (!scmd->result) |
2086 | scmd->result |= (DRIVER_TIMEOUT << 24); | |
91921e01 HR |
2087 | SCSI_LOG_ERROR_RECOVERY(3, |
2088 | scmd_printk(KERN_INFO, scmd, | |
470613b4 HR |
2089 | "%s: flush finish cmd\n", |
2090 | current->comm)); | |
1da177e4 LT |
2091 | scsi_finish_command(scmd); |
2092 | } | |
2093 | } | |
2094 | } | |
041c5fc3 | 2095 | EXPORT_SYMBOL(scsi_eh_flush_done_q); |
1da177e4 LT |
2096 | |
2097 | /** | |
2098 | * scsi_unjam_host - Attempt to fix a host which has a cmd that failed. | |
2099 | * @shost: Host to unjam. | |
2100 | * | |
2101 | * Notes: | |
2102 | * When we come in here, we *know* that all commands on the bus have | |
2103 | * either completed, failed or timed out. we also know that no further | |
2104 | * commands are being sent to the host, so things are relatively quiet | |
2105 | * and we have freedom to fiddle with things as we wish. | |
2106 | * | |
2107 | * This is only the *default* implementation. it is possible for | |
2108 | * individual drivers to supply their own version of this function, and | |
2109 | * if the maintainer wishes to do this, it is strongly suggested that | |
2110 | * this function be taken as a template and modified. this function | |
2111 | * was designed to correctly handle problems for about 95% of the | |
2112 | * different cases out there, and it should always provide at least a | |
2113 | * reasonable amount of error recovery. | |
2114 | * | |
2115 | * Any command marked 'failed' or 'timeout' must eventually have | |
2116 | * scsi_finish_cmd() called for it. we do all of the retry stuff | |
2117 | * here, so when we restart the host after we return it should have an | |
2118 | * empty queue. | |
dc8875e1 | 2119 | */ |
1da177e4 LT |
2120 | static void scsi_unjam_host(struct Scsi_Host *shost) |
2121 | { | |
2122 | unsigned long flags; | |
2123 | LIST_HEAD(eh_work_q); | |
2124 | LIST_HEAD(eh_done_q); | |
2125 | ||
2126 | spin_lock_irqsave(shost->host_lock, flags); | |
2127 | list_splice_init(&shost->eh_cmd_q, &eh_work_q); | |
2128 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2129 | ||
2130 | SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost, &eh_work_q)); | |
2131 | ||
2132 | if (!scsi_eh_get_sense(&eh_work_q, &eh_done_q)) | |
a0658632 | 2133 | scsi_eh_ready_devs(shost, &eh_work_q, &eh_done_q); |
1da177e4 | 2134 | |
b4562022 | 2135 | spin_lock_irqsave(shost->host_lock, flags); |
bb3b621a | 2136 | if (shost->eh_deadline != -1) |
b4562022 HR |
2137 | shost->last_reset = 0; |
2138 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
2139 | scsi_eh_flush_done_q(&eh_done_q); |
2140 | } | |
2141 | ||
2142 | /** | |
ad42eb1b | 2143 | * scsi_error_handler - SCSI error handler thread |
1da177e4 LT |
2144 | * @data: Host for which we are running. |
2145 | * | |
2146 | * Notes: | |
ad42eb1b CH |
2147 | * This is the main error handling loop. This is run as a kernel thread |
2148 | * for every SCSI host and handles all error handling activity. | |
dc8875e1 | 2149 | */ |
1da177e4 LT |
2150 | int scsi_error_handler(void *data) |
2151 | { | |
ad42eb1b | 2152 | struct Scsi_Host *shost = data; |
1da177e4 | 2153 | |
1da177e4 | 2154 | /* |
ad42eb1b CH |
2155 | * We use TASK_INTERRUPTIBLE so that the thread is not |
2156 | * counted against the load average as a running process. | |
2157 | * We never actually get interrupted because kthread_run | |
c03264a7 | 2158 | * disables signal delivery for the created thread. |
1da177e4 | 2159 | */ |
537b604c MH |
2160 | while (true) { |
2161 | /* | |
2162 | * The sequence in kthread_stop() sets the stop flag first | |
2163 | * then wakes the process. To avoid missed wakeups, the task | |
2164 | * should always be in a non running state before the stop | |
2165 | * flag is checked | |
2166 | */ | |
b9d5c6b7 | 2167 | set_current_state(TASK_INTERRUPTIBLE); |
537b604c MH |
2168 | if (kthread_should_stop()) |
2169 | break; | |
2170 | ||
ee7863bc | 2171 | if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) || |
74665016 | 2172 | shost->host_failed != atomic_read(&shost->host_busy)) { |
ad42eb1b | 2173 | SCSI_LOG_ERROR_RECOVERY(1, |
91921e01 HR |
2174 | shost_printk(KERN_INFO, shost, |
2175 | "scsi_eh_%d: sleeping\n", | |
2176 | shost->host_no)); | |
3ed7a470 | 2177 | schedule(); |
3ed7a470 JB |
2178 | continue; |
2179 | } | |
1da177e4 | 2180 | |
3ed7a470 | 2181 | __set_current_state(TASK_RUNNING); |
ad42eb1b | 2182 | SCSI_LOG_ERROR_RECOVERY(1, |
91921e01 HR |
2183 | shost_printk(KERN_INFO, shost, |
2184 | "scsi_eh_%d: waking up %d/%d/%d\n", | |
2185 | shost->host_no, shost->host_eh_scheduled, | |
74665016 CH |
2186 | shost->host_failed, |
2187 | atomic_read(&shost->host_busy))); | |
1da177e4 | 2188 | |
1da177e4 LT |
2189 | /* |
2190 | * We have a host that is failing for some reason. Figure out | |
2191 | * what we need to do to get it up and online again (if we can). | |
2192 | * If we fail, we end up taking the thing offline. | |
2193 | */ | |
ae0751ff | 2194 | if (!shost->eh_noresume && scsi_autopm_get_host(shost) != 0) { |
bc4f2401 | 2195 | SCSI_LOG_ERROR_RECOVERY(1, |
a222b1e2 HR |
2196 | shost_printk(KERN_ERR, shost, |
2197 | "scsi_eh_%d: unable to autoresume\n", | |
2198 | shost->host_no)); | |
bc4f2401 AS |
2199 | continue; |
2200 | } | |
2201 | ||
9227c33d CH |
2202 | if (shost->transportt->eh_strategy_handler) |
2203 | shost->transportt->eh_strategy_handler(shost); | |
1da177e4 LT |
2204 | else |
2205 | scsi_unjam_host(shost); | |
2206 | ||
72d8c36e WF |
2207 | /* All scmds have been handled */ |
2208 | shost->host_failed = 0; | |
2209 | ||
1da177e4 LT |
2210 | /* |
2211 | * Note - if the above fails completely, the action is to take | |
2212 | * individual devices offline and flush the queue of any | |
2213 | * outstanding requests that may have been pending. When we | |
2214 | * restart, we restart any I/O to any other devices on the bus | |
2215 | * which are still online. | |
2216 | */ | |
2217 | scsi_restart_operations(shost); | |
ae0751ff LM |
2218 | if (!shost->eh_noresume) |
2219 | scsi_autopm_put_host(shost); | |
1da177e4 | 2220 | } |
461a0ffb SR |
2221 | __set_current_state(TASK_RUNNING); |
2222 | ||
ad42eb1b | 2223 | SCSI_LOG_ERROR_RECOVERY(1, |
91921e01 HR |
2224 | shost_printk(KERN_INFO, shost, |
2225 | "Error handler scsi_eh_%d exiting\n", | |
2226 | shost->host_no)); | |
3ed7a470 | 2227 | shost->ehandler = NULL; |
1da177e4 LT |
2228 | return 0; |
2229 | } | |
2230 | ||
2231 | /* | |
2232 | * Function: scsi_report_bus_reset() | |
2233 | * | |
2234 | * Purpose: Utility function used by low-level drivers to report that | |
2235 | * they have observed a bus reset on the bus being handled. | |
2236 | * | |
2237 | * Arguments: shost - Host in question | |
2238 | * channel - channel on which reset was observed. | |
2239 | * | |
2240 | * Returns: Nothing | |
2241 | * | |
2242 | * Lock status: Host lock must be held. | |
2243 | * | |
2244 | * Notes: This only needs to be called if the reset is one which | |
2245 | * originates from an unknown location. Resets originated | |
2246 | * by the mid-level itself don't need to call this, but there | |
2247 | * should be no harm. | |
2248 | * | |
2249 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
2250 | * is properly treated. | |
2251 | */ | |
2252 | void scsi_report_bus_reset(struct Scsi_Host *shost, int channel) | |
2253 | { | |
2254 | struct scsi_device *sdev; | |
2255 | ||
2256 | __shost_for_each_device(sdev, shost) { | |
30bd7df8 MC |
2257 | if (channel == sdev_channel(sdev)) |
2258 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
2259 | } |
2260 | } | |
2261 | EXPORT_SYMBOL(scsi_report_bus_reset); | |
2262 | ||
2263 | /* | |
2264 | * Function: scsi_report_device_reset() | |
2265 | * | |
2266 | * Purpose: Utility function used by low-level drivers to report that | |
2267 | * they have observed a device reset on the device being handled. | |
2268 | * | |
2269 | * Arguments: shost - Host in question | |
2270 | * channel - channel on which reset was observed | |
2271 | * target - target on which reset was observed | |
2272 | * | |
2273 | * Returns: Nothing | |
2274 | * | |
2275 | * Lock status: Host lock must be held | |
2276 | * | |
2277 | * Notes: This only needs to be called if the reset is one which | |
2278 | * originates from an unknown location. Resets originated | |
2279 | * by the mid-level itself don't need to call this, but there | |
2280 | * should be no harm. | |
2281 | * | |
2282 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
2283 | * is properly treated. | |
2284 | */ | |
2285 | void scsi_report_device_reset(struct Scsi_Host *shost, int channel, int target) | |
2286 | { | |
2287 | struct scsi_device *sdev; | |
2288 | ||
2289 | __shost_for_each_device(sdev, shost) { | |
422c0d61 | 2290 | if (channel == sdev_channel(sdev) && |
30bd7df8 MC |
2291 | target == sdev_id(sdev)) |
2292 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
2293 | } |
2294 | } | |
2295 | EXPORT_SYMBOL(scsi_report_device_reset); | |
2296 | ||
2297 | static void | |
2298 | scsi_reset_provider_done_command(struct scsi_cmnd *scmd) | |
2299 | { | |
2300 | } | |
2301 | ||
176aa9d6 CH |
2302 | /** |
2303 | * scsi_ioctl_reset: explicitly reset a host/bus/target/device | |
2304 | * @dev: scsi_device to operate on | |
2305 | * @arg: reset type (see sg.h) | |
1da177e4 LT |
2306 | */ |
2307 | int | |
176aa9d6 | 2308 | scsi_ioctl_reset(struct scsi_device *dev, int __user *arg) |
1da177e4 | 2309 | { |
bc4f2401 | 2310 | struct scsi_cmnd *scmd; |
d7a1bb0a | 2311 | struct Scsi_Host *shost = dev->host; |
e9c787e6 | 2312 | struct request *rq; |
d7a1bb0a | 2313 | unsigned long flags; |
176aa9d6 CH |
2314 | int error = 0, rtn, val; |
2315 | ||
2316 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2317 | return -EACCES; | |
2318 | ||
2319 | error = get_user(val, arg); | |
2320 | if (error) | |
2321 | return error; | |
1da177e4 | 2322 | |
bc4f2401 | 2323 | if (scsi_autopm_get_host(shost) < 0) |
176aa9d6 | 2324 | return -EIO; |
bc4f2401 | 2325 | |
176aa9d6 | 2326 | error = -EIO; |
e9c787e6 CH |
2327 | rq = kzalloc(sizeof(struct request) + sizeof(struct scsi_cmnd) + |
2328 | shost->hostt->cmd_size, GFP_KERNEL); | |
2329 | if (!rq) | |
95eeb5f5 | 2330 | goto out_put_autopm_host; |
e9c787e6 | 2331 | blk_rq_init(NULL, rq); |
95eeb5f5 | 2332 | |
e9c787e6 CH |
2333 | scmd = (struct scsi_cmnd *)(rq + 1); |
2334 | scsi_init_command(dev, scmd); | |
2335 | scmd->request = rq; | |
82ed4db4 | 2336 | scmd->cmnd = scsi_req(rq)->cmd; |
64a87b24 | 2337 | |
1da177e4 | 2338 | scmd->scsi_done = scsi_reset_provider_done_command; |
30b0c37b | 2339 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
1da177e4 LT |
2340 | |
2341 | scmd->cmd_len = 0; | |
2342 | ||
2343 | scmd->sc_data_direction = DMA_BIDIRECTIONAL; | |
1da177e4 | 2344 | |
d7a1bb0a JS |
2345 | spin_lock_irqsave(shost->host_lock, flags); |
2346 | shost->tmf_in_progress = 1; | |
2347 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2348 | ||
176aa9d6 CH |
2349 | switch (val & ~SG_SCSI_RESET_NO_ESCALATE) { |
2350 | case SG_SCSI_RESET_NOTHING: | |
2351 | rtn = SUCCESS; | |
2352 | break; | |
2353 | case SG_SCSI_RESET_DEVICE: | |
1da177e4 | 2354 | rtn = scsi_try_bus_device_reset(scmd); |
176aa9d6 | 2355 | if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE)) |
1da177e4 LT |
2356 | break; |
2357 | /* FALLTHROUGH */ | |
176aa9d6 | 2358 | case SG_SCSI_RESET_TARGET: |
30bd7df8 | 2359 | rtn = scsi_try_target_reset(scmd); |
176aa9d6 | 2360 | if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE)) |
30bd7df8 MC |
2361 | break; |
2362 | /* FALLTHROUGH */ | |
176aa9d6 | 2363 | case SG_SCSI_RESET_BUS: |
1da177e4 | 2364 | rtn = scsi_try_bus_reset(scmd); |
176aa9d6 | 2365 | if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE)) |
1da177e4 LT |
2366 | break; |
2367 | /* FALLTHROUGH */ | |
176aa9d6 | 2368 | case SG_SCSI_RESET_HOST: |
1da177e4 | 2369 | rtn = scsi_try_host_reset(scmd); |
176aa9d6 CH |
2370 | if (rtn == SUCCESS) |
2371 | break; | |
176aa9d6 | 2372 | /* FALLTHROUGH */ |
3bf2ff67 | 2373 | default: |
1da177e4 | 2374 | rtn = FAILED; |
176aa9d6 | 2375 | break; |
1da177e4 LT |
2376 | } |
2377 | ||
176aa9d6 CH |
2378 | error = (rtn == SUCCESS) ? 0 : -EIO; |
2379 | ||
d7a1bb0a JS |
2380 | spin_lock_irqsave(shost->host_lock, flags); |
2381 | shost->tmf_in_progress = 0; | |
2382 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2383 | ||
2384 | /* | |
2385 | * be sure to wake up anyone who was sleeping or had their queue | |
2386 | * suspended while we performed the TMF. | |
2387 | */ | |
2388 | SCSI_LOG_ERROR_RECOVERY(3, | |
91921e01 HR |
2389 | shost_printk(KERN_INFO, shost, |
2390 | "waking up host to restart after TMF\n")); | |
d7a1bb0a JS |
2391 | |
2392 | wake_up(&shost->host_wait); | |
d7a1bb0a JS |
2393 | scsi_run_host_queues(shost); |
2394 | ||
0f121dd8 | 2395 | scsi_put_command(scmd); |
e9c787e6 | 2396 | kfree(rq); |
0f121dd8 | 2397 | |
04796336 | 2398 | out_put_autopm_host: |
bc4f2401 | 2399 | scsi_autopm_put_host(shost); |
176aa9d6 | 2400 | return error; |
1da177e4 | 2401 | } |
176aa9d6 | 2402 | EXPORT_SYMBOL(scsi_ioctl_reset); |
1da177e4 | 2403 | |
4753cbc0 HR |
2404 | bool scsi_command_normalize_sense(const struct scsi_cmnd *cmd, |
2405 | struct scsi_sense_hdr *sshdr) | |
1da177e4 LT |
2406 | { |
2407 | return scsi_normalize_sense(cmd->sense_buffer, | |
b80ca4f7 | 2408 | SCSI_SENSE_BUFFERSIZE, sshdr); |
1da177e4 LT |
2409 | } |
2410 | EXPORT_SYMBOL(scsi_command_normalize_sense); | |
2411 | ||
1da177e4 | 2412 | /** |
eb44820c | 2413 | * scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor format) |
1da177e4 LT |
2414 | * @sense_buffer: byte array of sense data |
2415 | * @sb_len: number of valid bytes in sense_buffer | |
2416 | * @info_out: pointer to 64 integer where 8 or 4 byte information | |
2417 | * field will be placed if found. | |
2418 | * | |
2419 | * Return value: | |
2908769c | 2420 | * true if information field found, false if not found. |
dc8875e1 | 2421 | */ |
2908769c DLM |
2422 | bool scsi_get_sense_info_fld(const u8 *sense_buffer, int sb_len, |
2423 | u64 *info_out) | |
1da177e4 | 2424 | { |
1da177e4 | 2425 | const u8 * ucp; |
1da177e4 LT |
2426 | |
2427 | if (sb_len < 7) | |
2908769c | 2428 | return false; |
1da177e4 LT |
2429 | switch (sense_buffer[0] & 0x7f) { |
2430 | case 0x70: | |
2431 | case 0x71: | |
2432 | if (sense_buffer[0] & 0x80) { | |
2908769c DLM |
2433 | *info_out = get_unaligned_be32(&sense_buffer[3]); |
2434 | return true; | |
2435 | } | |
2436 | return false; | |
1da177e4 LT |
2437 | case 0x72: |
2438 | case 0x73: | |
2439 | ucp = scsi_sense_desc_find(sense_buffer, sb_len, | |
2440 | 0 /* info desc */); | |
2441 | if (ucp && (0xa == ucp[1])) { | |
2908769c DLM |
2442 | *info_out = get_unaligned_be64(&ucp[4]); |
2443 | return true; | |
2444 | } | |
2445 | return false; | |
1da177e4 | 2446 | default: |
2908769c | 2447 | return false; |
1da177e4 LT |
2448 | } |
2449 | } | |
2450 | EXPORT_SYMBOL(scsi_get_sense_info_fld); |