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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> |
c829c394 | 36 | #include <scsi/scsi_transport.h> |
1da177e4 LT |
37 | #include <scsi/scsi_host.h> |
38 | #include <scsi/scsi_ioctl.h> | |
176aa9d6 | 39 | #include <scsi/sg.h> |
1da177e4 LT |
40 | |
41 | #include "scsi_priv.h" | |
42 | #include "scsi_logging.h" | |
79ee8304 | 43 | #include "scsi_transport_api.h" |
1da177e4 | 44 | |
bf816235 KT |
45 | #include <trace/events/scsi.h> |
46 | ||
14216561 JB |
47 | static void scsi_eh_done(struct scsi_cmnd *scmd); |
48 | ||
1da177e4 LT |
49 | /* |
50 | * These should *probably* be handled by the host itself. | |
51 | * Since it is allowed to sleep, it probably should. | |
52 | */ | |
53 | #define BUS_RESET_SETTLE_TIME (10) | |
54 | #define HOST_RESET_SETTLE_TIME (10) | |
55 | ||
3eef6257 | 56 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd); |
e494f6a7 HR |
57 | static int scsi_try_to_abort_cmd(struct scsi_host_template *, |
58 | struct scsi_cmnd *); | |
3eef6257 | 59 | |
1da177e4 LT |
60 | /* called with shost->host_lock held */ |
61 | void scsi_eh_wakeup(struct Scsi_Host *shost) | |
62 | { | |
74665016 | 63 | if (atomic_read(&shost->host_busy) == shost->host_failed) { |
bf816235 | 64 | trace_scsi_eh_wakeup(shost); |
3ed7a470 | 65 | wake_up_process(shost->ehandler); |
91921e01 HR |
66 | SCSI_LOG_ERROR_RECOVERY(5, shost_printk(KERN_INFO, shost, |
67 | "Waking error handler thread\n")); | |
1da177e4 LT |
68 | } |
69 | } | |
f8bbfc24 TH |
70 | |
71 | /** | |
72 | * scsi_schedule_eh - schedule EH for SCSI host | |
73 | * @shost: SCSI host to invoke error handling on. | |
74 | * | |
75 | * Schedule SCSI EH without scmd. | |
dc8875e1 | 76 | */ |
f8bbfc24 TH |
77 | void scsi_schedule_eh(struct Scsi_Host *shost) |
78 | { | |
79 | unsigned long flags; | |
80 | ||
81 | spin_lock_irqsave(shost->host_lock, flags); | |
82 | ||
83 | if (scsi_host_set_state(shost, SHOST_RECOVERY) == 0 || | |
84 | scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY) == 0) { | |
85 | shost->host_eh_scheduled++; | |
86 | scsi_eh_wakeup(shost); | |
87 | } | |
88 | ||
89 | spin_unlock_irqrestore(shost->host_lock, flags); | |
90 | } | |
91 | EXPORT_SYMBOL_GPL(scsi_schedule_eh); | |
1da177e4 | 92 | |
b4562022 HR |
93 | static int scsi_host_eh_past_deadline(struct Scsi_Host *shost) |
94 | { | |
bb3b621a | 95 | if (!shost->last_reset || shost->eh_deadline == -1) |
b4562022 HR |
96 | return 0; |
97 | ||
76ad3e59 HR |
98 | /* |
99 | * 32bit accesses are guaranteed to be atomic | |
100 | * (on all supported architectures), so instead | |
101 | * of using a spinlock we can as well double check | |
bb3b621a | 102 | * if eh_deadline has been set to 'off' during the |
76ad3e59 HR |
103 | * time_before call. |
104 | */ | |
105 | if (time_before(jiffies, shost->last_reset + shost->eh_deadline) && | |
bb3b621a | 106 | shost->eh_deadline > -1) |
b4562022 HR |
107 | return 0; |
108 | ||
109 | return 1; | |
110 | } | |
111 | ||
e494f6a7 HR |
112 | /** |
113 | * scmd_eh_abort_handler - Handle command aborts | |
114 | * @work: command to be aborted. | |
115 | */ | |
116 | void | |
117 | scmd_eh_abort_handler(struct work_struct *work) | |
118 | { | |
119 | struct scsi_cmnd *scmd = | |
120 | container_of(work, struct scsi_cmnd, abort_work.work); | |
121 | struct scsi_device *sdev = scmd->device; | |
e494f6a7 HR |
122 | int rtn; |
123 | ||
e494f6a7 | 124 | if (scsi_host_eh_past_deadline(sdev->host)) { |
e494f6a7 HR |
125 | SCSI_LOG_ERROR_RECOVERY(3, |
126 | scmd_printk(KERN_INFO, scmd, | |
127 | "scmd %p eh timeout, not aborting\n", | |
128 | scmd)); | |
129 | } else { | |
e494f6a7 HR |
130 | SCSI_LOG_ERROR_RECOVERY(3, |
131 | scmd_printk(KERN_INFO, scmd, | |
132 | "aborting command %p\n", scmd)); | |
133 | rtn = scsi_try_to_abort_cmd(sdev->host->hostt, scmd); | |
134 | if (rtn == SUCCESS) { | |
8922a908 | 135 | set_host_byte(scmd, DID_TIME_OUT); |
bb3b621a RM |
136 | if (scsi_host_eh_past_deadline(sdev->host)) { |
137 | SCSI_LOG_ERROR_RECOVERY(3, | |
138 | scmd_printk(KERN_INFO, scmd, | |
139 | "scmd %p eh timeout, " | |
140 | "not retrying aborted " | |
141 | "command\n", scmd)); | |
142 | } else if (!scsi_noretry_cmd(scmd) && | |
e494f6a7 HR |
143 | (++scmd->retries <= scmd->allowed)) { |
144 | SCSI_LOG_ERROR_RECOVERY(3, | |
145 | scmd_printk(KERN_WARNING, scmd, | |
146 | "scmd %p retry " | |
147 | "aborted command\n", scmd)); | |
148 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); | |
bb3b621a | 149 | return; |
e494f6a7 HR |
150 | } else { |
151 | SCSI_LOG_ERROR_RECOVERY(3, | |
152 | scmd_printk(KERN_WARNING, scmd, | |
153 | "scmd %p finish " | |
154 | "aborted command\n", scmd)); | |
155 | scsi_finish_command(scmd); | |
bb3b621a | 156 | return; |
e494f6a7 | 157 | } |
bb3b621a RM |
158 | } else { |
159 | SCSI_LOG_ERROR_RECOVERY(3, | |
160 | scmd_printk(KERN_INFO, scmd, | |
883a030f HR |
161 | "scmd %p abort %s\n", scmd, |
162 | (rtn == FAST_IO_FAIL) ? | |
163 | "not send" : "failed")); | |
e494f6a7 | 164 | } |
e494f6a7 HR |
165 | } |
166 | ||
167 | if (!scsi_eh_scmd_add(scmd, 0)) { | |
168 | SCSI_LOG_ERROR_RECOVERY(3, | |
169 | scmd_printk(KERN_WARNING, scmd, | |
170 | "scmd %p terminate " | |
171 | "aborted command\n", scmd)); | |
8922a908 | 172 | set_host_byte(scmd, DID_TIME_OUT); |
e494f6a7 HR |
173 | scsi_finish_command(scmd); |
174 | } | |
175 | } | |
176 | ||
177 | /** | |
178 | * scsi_abort_command - schedule a command abort | |
179 | * @scmd: scmd to abort. | |
180 | * | |
181 | * We only need to abort commands after a command timeout | |
182 | */ | |
183 | static int | |
184 | scsi_abort_command(struct scsi_cmnd *scmd) | |
185 | { | |
186 | struct scsi_device *sdev = scmd->device; | |
187 | struct Scsi_Host *shost = sdev->host; | |
188 | unsigned long flags; | |
189 | ||
190 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) { | |
191 | /* | |
192 | * Retry after abort failed, escalate to next level. | |
193 | */ | |
7daf4804 | 194 | scmd->eh_eflags &= ~SCSI_EH_ABORT_SCHEDULED; |
e494f6a7 HR |
195 | SCSI_LOG_ERROR_RECOVERY(3, |
196 | scmd_printk(KERN_INFO, scmd, | |
197 | "scmd %p previous abort failed\n", scmd)); | |
fcc95a76 | 198 | BUG_ON(delayed_work_pending(&scmd->abort_work)); |
e494f6a7 HR |
199 | return FAILED; |
200 | } | |
201 | ||
202 | /* | |
203 | * Do not try a command abort if | |
204 | * SCSI EH has already started. | |
205 | */ | |
206 | spin_lock_irqsave(shost->host_lock, flags); | |
207 | if (scsi_host_in_recovery(shost)) { | |
208 | spin_unlock_irqrestore(shost->host_lock, flags); | |
209 | SCSI_LOG_ERROR_RECOVERY(3, | |
210 | scmd_printk(KERN_INFO, scmd, | |
211 | "scmd %p not aborting, host in recovery\n", | |
212 | scmd)); | |
213 | return FAILED; | |
214 | } | |
215 | ||
bb3b621a | 216 | if (shost->eh_deadline != -1 && !shost->last_reset) |
e494f6a7 HR |
217 | shost->last_reset = jiffies; |
218 | spin_unlock_irqrestore(shost->host_lock, flags); | |
219 | ||
220 | scmd->eh_eflags |= SCSI_EH_ABORT_SCHEDULED; | |
221 | SCSI_LOG_ERROR_RECOVERY(3, | |
222 | scmd_printk(KERN_INFO, scmd, | |
223 | "scmd %p abort scheduled\n", scmd)); | |
224 | queue_delayed_work(shost->tmf_work_q, &scmd->abort_work, HZ / 100); | |
225 | return SUCCESS; | |
226 | } | |
227 | ||
1da177e4 LT |
228 | /** |
229 | * scsi_eh_scmd_add - add scsi cmd to error handling. | |
230 | * @scmd: scmd to run eh on. | |
231 | * @eh_flag: optional SCSI_EH flag. | |
232 | * | |
233 | * Return value: | |
234 | * 0 on failure. | |
dc8875e1 | 235 | */ |
1da177e4 LT |
236 | int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag) |
237 | { | |
238 | struct Scsi_Host *shost = scmd->device->host; | |
239 | unsigned long flags; | |
939647ee | 240 | int ret = 0; |
1da177e4 | 241 | |
3ed7a470 | 242 | if (!shost->ehandler) |
1da177e4 LT |
243 | return 0; |
244 | ||
245 | spin_lock_irqsave(shost->host_lock, flags); | |
939647ee JB |
246 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) |
247 | if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) | |
248 | goto out_unlock; | |
1da177e4 | 249 | |
bb3b621a | 250 | if (shost->eh_deadline != -1 && !shost->last_reset) |
b4562022 HR |
251 | shost->last_reset = jiffies; |
252 | ||
939647ee | 253 | ret = 1; |
e494f6a7 HR |
254 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) |
255 | eh_flag &= ~SCSI_EH_CANCEL_CMD; | |
3111b0d1 | 256 | scmd->eh_eflags |= eh_flag; |
1da177e4 | 257 | list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q); |
1da177e4 LT |
258 | shost->host_failed++; |
259 | scsi_eh_wakeup(shost); | |
939647ee | 260 | out_unlock: |
1da177e4 | 261 | spin_unlock_irqrestore(shost->host_lock, flags); |
939647ee | 262 | return ret; |
1da177e4 LT |
263 | } |
264 | ||
1da177e4 LT |
265 | /** |
266 | * scsi_times_out - Timeout function for normal scsi commands. | |
242f9dcb | 267 | * @req: request that is timing out. |
1da177e4 LT |
268 | * |
269 | * Notes: | |
270 | * We do not need to lock this. There is the potential for a race | |
271 | * only in that the normal completion handling might run, but if the | |
272 | * normal completion function determines that the timer has already | |
273 | * fired, then it mustn't do anything. | |
dc8875e1 | 274 | */ |
242f9dcb | 275 | enum blk_eh_timer_return scsi_times_out(struct request *req) |
1da177e4 | 276 | { |
242f9dcb | 277 | struct scsi_cmnd *scmd = req->special; |
242f9dcb | 278 | enum blk_eh_timer_return rtn = BLK_EH_NOT_HANDLED; |
0bf8c869 | 279 | struct Scsi_Host *host = scmd->device->host; |
6c5f8ce1 | 280 | |
bf816235 | 281 | trace_scsi_dispatch_cmd_timeout(scmd); |
1da177e4 LT |
282 | scsi_log_completion(scmd, TIMEOUT_ERROR); |
283 | ||
bb3b621a | 284 | if (host->eh_deadline != -1 && !host->last_reset) |
b4562022 HR |
285 | host->last_reset = jiffies; |
286 | ||
0bf8c869 JJ |
287 | if (host->transportt->eh_timed_out) |
288 | rtn = host->transportt->eh_timed_out(scmd); | |
289 | else if (host->hostt->eh_timed_out) | |
290 | rtn = host->hostt->eh_timed_out(scmd); | |
1da177e4 | 291 | |
a33c070b HR |
292 | if (rtn == BLK_EH_NOT_HANDLED) { |
293 | if (!host->hostt->no_async_abort && | |
294 | scsi_abort_command(scmd) == SUCCESS) | |
e494f6a7 HR |
295 | return BLK_EH_NOT_HANDLED; |
296 | ||
a33c070b HR |
297 | set_host_byte(scmd, DID_TIME_OUT); |
298 | if (!scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD)) | |
299 | rtn = BLK_EH_HANDLED; | |
300 | } | |
242f9dcb | 301 | |
fa990781 | 302 | return rtn; |
1da177e4 LT |
303 | } |
304 | ||
305 | /** | |
306 | * scsi_block_when_processing_errors - Prevent cmds from being queued. | |
307 | * @sdev: Device on which we are performing recovery. | |
308 | * | |
309 | * Description: | |
310 | * We block until the host is out of error recovery, and then check to | |
311 | * see whether the host or the device is offline. | |
312 | * | |
313 | * Return value: | |
314 | * 0 when dev was taken offline by error recovery. 1 OK to proceed. | |
dc8875e1 | 315 | */ |
1da177e4 LT |
316 | int scsi_block_when_processing_errors(struct scsi_device *sdev) |
317 | { | |
318 | int online; | |
319 | ||
939647ee | 320 | wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host)); |
1da177e4 LT |
321 | |
322 | online = scsi_device_online(sdev); | |
323 | ||
91921e01 HR |
324 | SCSI_LOG_ERROR_RECOVERY(5, sdev_printk(KERN_INFO, sdev, |
325 | "%s: rtn: %d\n", __func__, online)); | |
1da177e4 LT |
326 | |
327 | return online; | |
328 | } | |
329 | EXPORT_SYMBOL(scsi_block_when_processing_errors); | |
330 | ||
331 | #ifdef CONFIG_SCSI_LOGGING | |
332 | /** | |
333 | * scsi_eh_prt_fail_stats - Log info on failures. | |
334 | * @shost: scsi host being recovered. | |
335 | * @work_q: Queue of scsi cmds to process. | |
dc8875e1 | 336 | */ |
1da177e4 LT |
337 | static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost, |
338 | struct list_head *work_q) | |
339 | { | |
340 | struct scsi_cmnd *scmd; | |
341 | struct scsi_device *sdev; | |
342 | int total_failures = 0; | |
343 | int cmd_failed = 0; | |
344 | int cmd_cancel = 0; | |
345 | int devices_failed = 0; | |
346 | ||
347 | shost_for_each_device(sdev, shost) { | |
348 | list_for_each_entry(scmd, work_q, eh_entry) { | |
349 | if (scmd->device == sdev) { | |
350 | ++total_failures; | |
3111b0d1 | 351 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) |
1da177e4 | 352 | ++cmd_cancel; |
0bf8c869 | 353 | else |
1da177e4 LT |
354 | ++cmd_failed; |
355 | } | |
356 | } | |
357 | ||
358 | if (cmd_cancel || cmd_failed) { | |
359 | SCSI_LOG_ERROR_RECOVERY(3, | |
a3a790dc | 360 | shost_printk(KERN_INFO, shost, |
9ccfc756 | 361 | "%s: cmds failed: %d, cancel: %d\n", |
cadbd4a5 | 362 | __func__, cmd_failed, |
9ccfc756 | 363 | cmd_cancel)); |
1da177e4 LT |
364 | cmd_cancel = 0; |
365 | cmd_failed = 0; | |
366 | ++devices_failed; | |
367 | } | |
368 | } | |
369 | ||
91921e01 HR |
370 | SCSI_LOG_ERROR_RECOVERY(2, shost_printk(KERN_INFO, shost, |
371 | "Total of %d commands on %d" | |
372 | " devices require eh work\n", | |
0bf8c869 | 373 | total_failures, devices_failed)); |
1da177e4 LT |
374 | } |
375 | #endif | |
376 | ||
279afdfe EM |
377 | /** |
378 | * scsi_report_lun_change - Set flag on all *other* devices on the same target | |
379 | * to indicate that a UNIT ATTENTION is expected. | |
380 | * @sdev: Device reporting the UNIT ATTENTION | |
381 | */ | |
382 | static void scsi_report_lun_change(struct scsi_device *sdev) | |
383 | { | |
384 | sdev->sdev_target->expecting_lun_change = 1; | |
385 | } | |
386 | ||
387 | /** | |
388 | * scsi_report_sense - Examine scsi sense information and log messages for | |
389 | * certain conditions, also issue uevents for some of them. | |
390 | * @sdev: Device reporting the sense code | |
391 | * @sshdr: sshdr to be examined | |
392 | */ | |
393 | static void scsi_report_sense(struct scsi_device *sdev, | |
394 | struct scsi_sense_hdr *sshdr) | |
395 | { | |
396 | enum scsi_device_event evt_type = SDEV_EVT_MAXBITS; /* i.e. none */ | |
397 | ||
398 | if (sshdr->sense_key == UNIT_ATTENTION) { | |
399 | if (sshdr->asc == 0x3f && sshdr->ascq == 0x03) { | |
400 | evt_type = SDEV_EVT_INQUIRY_CHANGE_REPORTED; | |
401 | sdev_printk(KERN_WARNING, sdev, | |
402 | "Inquiry data has changed"); | |
403 | } else if (sshdr->asc == 0x3f && sshdr->ascq == 0x0e) { | |
404 | evt_type = SDEV_EVT_LUN_CHANGE_REPORTED; | |
405 | scsi_report_lun_change(sdev); | |
406 | sdev_printk(KERN_WARNING, sdev, | |
407 | "Warning! Received an indication that the " | |
408 | "LUN assignments on this target have " | |
409 | "changed. The Linux SCSI layer does not " | |
410 | "automatically remap LUN assignments.\n"); | |
411 | } else if (sshdr->asc == 0x3f) | |
412 | sdev_printk(KERN_WARNING, sdev, | |
413 | "Warning! Received an indication that the " | |
414 | "operating parameters on this target have " | |
415 | "changed. The Linux SCSI layer does not " | |
416 | "automatically adjust these parameters.\n"); | |
417 | ||
418 | if (sshdr->asc == 0x38 && sshdr->ascq == 0x07) { | |
419 | evt_type = SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED; | |
420 | sdev_printk(KERN_WARNING, sdev, | |
421 | "Warning! Received an indication that the " | |
422 | "LUN reached a thin provisioning soft " | |
423 | "threshold.\n"); | |
424 | } | |
425 | ||
426 | if (sshdr->asc == 0x2a && sshdr->ascq == 0x01) { | |
427 | evt_type = SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED; | |
428 | sdev_printk(KERN_WARNING, sdev, | |
429 | "Mode parameters changed"); | |
430 | } else if (sshdr->asc == 0x2a && sshdr->ascq == 0x09) { | |
431 | evt_type = SDEV_EVT_CAPACITY_CHANGE_REPORTED; | |
432 | sdev_printk(KERN_WARNING, sdev, | |
433 | "Capacity data has changed"); | |
434 | } else if (sshdr->asc == 0x2a) | |
435 | sdev_printk(KERN_WARNING, sdev, | |
436 | "Parameters changed"); | |
437 | } | |
438 | ||
439 | if (evt_type != SDEV_EVT_MAXBITS) { | |
440 | set_bit(evt_type, sdev->pending_events); | |
441 | schedule_work(&sdev->event_work); | |
442 | } | |
443 | } | |
444 | ||
1da177e4 LT |
445 | /** |
446 | * scsi_check_sense - Examine scsi cmd sense | |
447 | * @scmd: Cmd to have sense checked. | |
448 | * | |
449 | * Return value: | |
87f14e65 | 450 | * SUCCESS or FAILED or NEEDS_RETRY or ADD_TO_MLQUEUE |
1da177e4 LT |
451 | * |
452 | * Notes: | |
453 | * When a deferred error is detected the current command has | |
454 | * not been executed and needs retrying. | |
dc8875e1 | 455 | */ |
1da177e4 LT |
456 | static int scsi_check_sense(struct scsi_cmnd *scmd) |
457 | { | |
a6a8d9f8 | 458 | struct scsi_device *sdev = scmd->device; |
1da177e4 LT |
459 | struct scsi_sense_hdr sshdr; |
460 | ||
461 | if (! scsi_command_normalize_sense(scmd, &sshdr)) | |
462 | return FAILED; /* no valid sense data */ | |
463 | ||
279afdfe EM |
464 | scsi_report_sense(sdev, &sshdr); |
465 | ||
1da177e4 LT |
466 | if (scsi_sense_is_deferred(&sshdr)) |
467 | return NEEDS_RETRY; | |
468 | ||
a6a8d9f8 CS |
469 | if (sdev->scsi_dh_data && sdev->scsi_dh_data->scsi_dh && |
470 | sdev->scsi_dh_data->scsi_dh->check_sense) { | |
471 | int rc; | |
472 | ||
473 | rc = sdev->scsi_dh_data->scsi_dh->check_sense(sdev, &sshdr); | |
474 | if (rc != SCSI_RETURN_NOT_HANDLED) | |
475 | return rc; | |
476 | /* handler does not care. Drop down to default handling */ | |
477 | } | |
478 | ||
e925cc43 CH |
479 | if (scmd->cmnd[0] == TEST_UNIT_READY && scmd->scsi_done != scsi_eh_done) |
480 | /* | |
481 | * nasty: for mid-layer issued TURs, we need to return the | |
482 | * actual sense data without any recovery attempt. For eh | |
483 | * issued ones, we need to try to recover and interpret | |
484 | */ | |
485 | return SUCCESS; | |
486 | ||
1da177e4 LT |
487 | /* |
488 | * Previous logic looked for FILEMARK, EOM or ILI which are | |
489 | * mainly associated with tapes and returned SUCCESS. | |
490 | */ | |
491 | if (sshdr.response_code == 0x70) { | |
492 | /* fixed format */ | |
493 | if (scmd->sense_buffer[2] & 0xe0) | |
494 | return SUCCESS; | |
495 | } else { | |
496 | /* | |
497 | * descriptor format: look for "stream commands sense data | |
498 | * descriptor" (see SSC-3). Assume single sense data | |
499 | * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG. | |
500 | */ | |
501 | if ((sshdr.additional_length > 3) && | |
502 | (scmd->sense_buffer[8] == 0x4) && | |
503 | (scmd->sense_buffer[11] & 0xe0)) | |
504 | return SUCCESS; | |
505 | } | |
506 | ||
507 | switch (sshdr.sense_key) { | |
508 | case NO_SENSE: | |
509 | return SUCCESS; | |
510 | case RECOVERED_ERROR: | |
511 | return /* soft_error */ SUCCESS; | |
512 | ||
513 | case ABORTED_COMMAND: | |
511e44f4 MP |
514 | if (sshdr.asc == 0x10) /* DIF */ |
515 | return SUCCESS; | |
516 | ||
1da177e4 LT |
517 | return NEEDS_RETRY; |
518 | case NOT_READY: | |
519 | case UNIT_ATTENTION: | |
520 | /* | |
521 | * if we are expecting a cc/ua because of a bus reset that we | |
522 | * performed, treat this just as a retry. otherwise this is | |
523 | * information that we should pass up to the upper-level driver | |
524 | * so that we can deal with it there. | |
525 | */ | |
526 | if (scmd->device->expecting_cc_ua) { | |
dfcf7775 TH |
527 | /* |
528 | * Because some device does not queue unit | |
529 | * attentions correctly, we carefully check | |
530 | * additional sense code and qualifier so as | |
531 | * not to squash media change unit attention. | |
532 | */ | |
533 | if (sshdr.asc != 0x28 || sshdr.ascq != 0x00) { | |
534 | scmd->device->expecting_cc_ua = 0; | |
535 | return NEEDS_RETRY; | |
536 | } | |
1da177e4 | 537 | } |
279afdfe EM |
538 | /* |
539 | * we might also expect a cc/ua if another LUN on the target | |
540 | * reported a UA with an ASC/ASCQ of 3F 0E - | |
541 | * REPORTED LUNS DATA HAS CHANGED. | |
542 | */ | |
543 | if (scmd->device->sdev_target->expecting_lun_change && | |
544 | sshdr.asc == 0x3f && sshdr.ascq == 0x0e) | |
545 | return NEEDS_RETRY; | |
1da177e4 | 546 | /* |
0bf8c869 | 547 | * if the device is in the process of becoming ready, we |
1da177e4 LT |
548 | * should retry. |
549 | */ | |
550 | if ((sshdr.asc == 0x04) && (sshdr.ascq == 0x01)) | |
551 | return NEEDS_RETRY; | |
552 | /* | |
553 | * if the device is not started, we need to wake | |
554 | * the error handler to start the motor | |
555 | */ | |
556 | if (scmd->device->allow_restart && | |
557 | (sshdr.asc == 0x04) && (sshdr.ascq == 0x02)) | |
558 | return FAILED; | |
02e031cb CH |
559 | /* |
560 | * Pass the UA upwards for a determination in the completion | |
561 | * functions. | |
562 | */ | |
563 | return SUCCESS; | |
1da177e4 | 564 | |
63583cca | 565 | /* these are not supported */ |
a9d6ceb8 HR |
566 | case DATA_PROTECT: |
567 | if (sshdr.asc == 0x27 && sshdr.ascq == 0x07) { | |
568 | /* Thin provisioning hard threshold reached */ | |
569 | set_host_byte(scmd, DID_ALLOC_FAILURE); | |
570 | return SUCCESS; | |
571 | } | |
1da177e4 LT |
572 | case COPY_ABORTED: |
573 | case VOLUME_OVERFLOW: | |
574 | case MISCOMPARE: | |
63583cca | 575 | case BLANK_CHECK: |
87f14e65 HR |
576 | set_host_byte(scmd, DID_TARGET_FAILURE); |
577 | return SUCCESS; | |
1da177e4 LT |
578 | |
579 | case MEDIUM_ERROR: | |
fd1b494d LT |
580 | if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */ |
581 | sshdr.asc == 0x13 || /* AMNF DATA FIELD */ | |
582 | sshdr.asc == 0x14) { /* RECORD NOT FOUND */ | |
7e782af5 | 583 | set_host_byte(scmd, DID_MEDIUM_ERROR); |
87f14e65 | 584 | return SUCCESS; |
fd1b494d | 585 | } |
1da177e4 LT |
586 | return NEEDS_RETRY; |
587 | ||
588 | case HARDWARE_ERROR: | |
589 | if (scmd->device->retry_hwerror) | |
bb0003c1 | 590 | return ADD_TO_MLQUEUE; |
1da177e4 | 591 | else |
87f14e65 | 592 | set_host_byte(scmd, DID_TARGET_FAILURE); |
1da177e4 LT |
593 | |
594 | case ILLEGAL_REQUEST: | |
47ac56db MS |
595 | if (sshdr.asc == 0x20 || /* Invalid command operation code */ |
596 | sshdr.asc == 0x21 || /* Logical block address out of range */ | |
597 | sshdr.asc == 0x24 || /* Invalid field in cdb */ | |
598 | sshdr.asc == 0x26) { /* Parameter value invalid */ | |
87f14e65 | 599 | set_host_byte(scmd, DID_TARGET_FAILURE); |
47ac56db MS |
600 | } |
601 | return SUCCESS; | |
602 | ||
1da177e4 LT |
603 | default: |
604 | return SUCCESS; | |
605 | } | |
606 | } | |
607 | ||
4a84067d VD |
608 | static void scsi_handle_queue_ramp_up(struct scsi_device *sdev) |
609 | { | |
610 | struct scsi_host_template *sht = sdev->host->hostt; | |
611 | struct scsi_device *tmp_sdev; | |
612 | ||
c40ecc12 | 613 | if (!sht->track_queue_depth || |
4a84067d VD |
614 | sdev->queue_depth >= sdev->max_queue_depth) |
615 | return; | |
616 | ||
617 | if (time_before(jiffies, | |
618 | sdev->last_queue_ramp_up + sdev->queue_ramp_up_period)) | |
619 | return; | |
620 | ||
621 | if (time_before(jiffies, | |
622 | sdev->last_queue_full_time + sdev->queue_ramp_up_period)) | |
623 | return; | |
624 | ||
625 | /* | |
626 | * Walk all devices of a target and do | |
627 | * ramp up on them. | |
628 | */ | |
629 | shost_for_each_device(tmp_sdev, sdev->host) { | |
630 | if (tmp_sdev->channel != sdev->channel || | |
631 | tmp_sdev->id != sdev->id || | |
632 | tmp_sdev->queue_depth == sdev->max_queue_depth) | |
633 | continue; | |
c40ecc12 | 634 | |
db5ed4df | 635 | scsi_change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1); |
4a84067d VD |
636 | sdev->last_queue_ramp_up = jiffies; |
637 | } | |
638 | } | |
639 | ||
42a6a918 MC |
640 | static void scsi_handle_queue_full(struct scsi_device *sdev) |
641 | { | |
642 | struct scsi_host_template *sht = sdev->host->hostt; | |
643 | struct scsi_device *tmp_sdev; | |
644 | ||
c40ecc12 | 645 | if (!sht->track_queue_depth) |
42a6a918 MC |
646 | return; |
647 | ||
648 | shost_for_each_device(tmp_sdev, sdev->host) { | |
649 | if (tmp_sdev->channel != sdev->channel || | |
650 | tmp_sdev->id != sdev->id) | |
651 | continue; | |
652 | /* | |
653 | * We do not know the number of commands that were at | |
654 | * the device when we got the queue full so we start | |
655 | * from the highest possible value and work our way down. | |
656 | */ | |
c40ecc12 | 657 | scsi_track_queue_full(tmp_sdev, tmp_sdev->queue_depth - 1); |
42a6a918 MC |
658 | } |
659 | } | |
660 | ||
1da177e4 LT |
661 | /** |
662 | * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD. | |
663 | * @scmd: SCSI cmd to examine. | |
664 | * | |
665 | * Notes: | |
666 | * This is *only* called when we are examining the status of commands | |
667 | * queued during error recovery. the main difference here is that we | |
668 | * don't allow for the possibility of retries here, and we are a lot | |
669 | * more restrictive about what we consider acceptable. | |
dc8875e1 | 670 | */ |
1da177e4 LT |
671 | static int scsi_eh_completed_normally(struct scsi_cmnd *scmd) |
672 | { | |
673 | /* | |
674 | * first check the host byte, to see if there is anything in there | |
675 | * that would indicate what we need to do. | |
676 | */ | |
677 | if (host_byte(scmd->result) == DID_RESET) { | |
678 | /* | |
679 | * rats. we are already in the error handler, so we now | |
680 | * get to try and figure out what to do next. if the sense | |
681 | * is valid, we have a pretty good idea of what to do. | |
682 | * if not, we mark it as FAILED. | |
683 | */ | |
684 | return scsi_check_sense(scmd); | |
685 | } | |
686 | if (host_byte(scmd->result) != DID_OK) | |
687 | return FAILED; | |
688 | ||
689 | /* | |
690 | * next, check the message byte. | |
691 | */ | |
692 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
693 | return FAILED; | |
694 | ||
695 | /* | |
696 | * now, check the status byte to see if this indicates | |
697 | * anything special. | |
698 | */ | |
699 | switch (status_byte(scmd->result)) { | |
700 | case GOOD: | |
4a84067d | 701 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 LT |
702 | case COMMAND_TERMINATED: |
703 | return SUCCESS; | |
704 | case CHECK_CONDITION: | |
705 | return scsi_check_sense(scmd); | |
706 | case CONDITION_GOOD: | |
707 | case INTERMEDIATE_GOOD: | |
708 | case INTERMEDIATE_C_GOOD: | |
709 | /* | |
710 | * who knows? FIXME(eric) | |
711 | */ | |
712 | return SUCCESS; | |
5f91bb05 | 713 | case RESERVATION_CONFLICT: |
67110dfd JB |
714 | if (scmd->cmnd[0] == TEST_UNIT_READY) |
715 | /* it is a success, we probed the device and | |
716 | * found it */ | |
717 | return SUCCESS; | |
718 | /* otherwise, we failed to send the command */ | |
719 | return FAILED; | |
1da177e4 | 720 | case QUEUE_FULL: |
42a6a918 MC |
721 | scsi_handle_queue_full(scmd->device); |
722 | /* fall through */ | |
723 | case BUSY: | |
3eb3a928 | 724 | return NEEDS_RETRY; |
1da177e4 LT |
725 | default: |
726 | return FAILED; | |
727 | } | |
728 | return FAILED; | |
729 | } | |
730 | ||
1da177e4 LT |
731 | /** |
732 | * scsi_eh_done - Completion function for error handling. | |
733 | * @scmd: Cmd that is done. | |
dc8875e1 | 734 | */ |
1da177e4 LT |
735 | static void scsi_eh_done(struct scsi_cmnd *scmd) |
736 | { | |
0bf8c869 | 737 | struct completion *eh_action; |
85631672 | 738 | |
91921e01 HR |
739 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
740 | "%s scmd: %p result: %x\n", | |
cadbd4a5 | 741 | __func__, scmd, scmd->result)); |
85631672 MR |
742 | |
743 | eh_action = scmd->device->host->eh_action; | |
744 | if (eh_action) | |
745 | complete(eh_action); | |
1da177e4 LT |
746 | } |
747 | ||
292148f8 BK |
748 | /** |
749 | * scsi_try_host_reset - ask host adapter to reset itself | |
c2b3ebd0 | 750 | * @scmd: SCSI cmd to send host reset. |
dc8875e1 | 751 | */ |
292148f8 BK |
752 | static int scsi_try_host_reset(struct scsi_cmnd *scmd) |
753 | { | |
754 | unsigned long flags; | |
755 | int rtn; | |
0bf8c869 JJ |
756 | struct Scsi_Host *host = scmd->device->host; |
757 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 | 758 | |
91921e01 HR |
759 | SCSI_LOG_ERROR_RECOVERY(3, |
760 | shost_printk(KERN_INFO, host, "Snd Host RST\n")); | |
292148f8 | 761 | |
0bf8c869 | 762 | if (!hostt->eh_host_reset_handler) |
292148f8 BK |
763 | return FAILED; |
764 | ||
0bf8c869 | 765 | rtn = hostt->eh_host_reset_handler(scmd); |
292148f8 BK |
766 | |
767 | if (rtn == SUCCESS) { | |
0bf8c869 | 768 | if (!hostt->skip_settle_delay) |
292148f8 | 769 | ssleep(HOST_RESET_SETTLE_TIME); |
0bf8c869 JJ |
770 | spin_lock_irqsave(host->host_lock, flags); |
771 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
772 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
773 | } |
774 | ||
775 | return rtn; | |
776 | } | |
777 | ||
778 | /** | |
779 | * scsi_try_bus_reset - ask host to perform a bus reset | |
780 | * @scmd: SCSI cmd to send bus reset. | |
dc8875e1 | 781 | */ |
292148f8 BK |
782 | static int scsi_try_bus_reset(struct scsi_cmnd *scmd) |
783 | { | |
784 | unsigned long flags; | |
785 | int rtn; | |
0bf8c869 JJ |
786 | struct Scsi_Host *host = scmd->device->host; |
787 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 | 788 | |
91921e01 HR |
789 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
790 | "%s: Snd Bus RST\n", __func__)); | |
292148f8 | 791 | |
0bf8c869 | 792 | if (!hostt->eh_bus_reset_handler) |
292148f8 BK |
793 | return FAILED; |
794 | ||
0bf8c869 | 795 | rtn = hostt->eh_bus_reset_handler(scmd); |
292148f8 BK |
796 | |
797 | if (rtn == SUCCESS) { | |
0bf8c869 | 798 | if (!hostt->skip_settle_delay) |
292148f8 | 799 | ssleep(BUS_RESET_SETTLE_TIME); |
0bf8c869 JJ |
800 | spin_lock_irqsave(host->host_lock, flags); |
801 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
802 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
803 | } |
804 | ||
805 | return rtn; | |
806 | } | |
807 | ||
30bd7df8 MC |
808 | static void __scsi_report_device_reset(struct scsi_device *sdev, void *data) |
809 | { | |
810 | sdev->was_reset = 1; | |
811 | sdev->expecting_cc_ua = 1; | |
812 | } | |
813 | ||
814 | /** | |
815 | * scsi_try_target_reset - Ask host to perform a target reset | |
816 | * @scmd: SCSI cmd used to send a target reset | |
817 | * | |
818 | * Notes: | |
819 | * There is no timeout for this operation. if this operation is | |
820 | * unreliable for a given host, then the host itself needs to put a | |
821 | * timer on it, and set the host back to a consistent state prior to | |
822 | * returning. | |
823 | */ | |
824 | static int scsi_try_target_reset(struct scsi_cmnd *scmd) | |
825 | { | |
826 | unsigned long flags; | |
827 | int rtn; | |
0bf8c869 JJ |
828 | struct Scsi_Host *host = scmd->device->host; |
829 | struct scsi_host_template *hostt = host->hostt; | |
30bd7df8 | 830 | |
0bf8c869 | 831 | if (!hostt->eh_target_reset_handler) |
30bd7df8 MC |
832 | return FAILED; |
833 | ||
0bf8c869 | 834 | rtn = hostt->eh_target_reset_handler(scmd); |
30bd7df8 | 835 | if (rtn == SUCCESS) { |
0bf8c869 | 836 | spin_lock_irqsave(host->host_lock, flags); |
30bd7df8 MC |
837 | __starget_for_each_device(scsi_target(scmd->device), NULL, |
838 | __scsi_report_device_reset); | |
0bf8c869 | 839 | spin_unlock_irqrestore(host->host_lock, flags); |
30bd7df8 MC |
840 | } |
841 | ||
842 | return rtn; | |
843 | } | |
844 | ||
292148f8 BK |
845 | /** |
846 | * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev | |
847 | * @scmd: SCSI cmd used to send BDR | |
848 | * | |
849 | * Notes: | |
850 | * There is no timeout for this operation. if this operation is | |
851 | * unreliable for a given host, then the host itself needs to put a | |
852 | * timer on it, and set the host back to a consistent state prior to | |
853 | * returning. | |
dc8875e1 | 854 | */ |
292148f8 BK |
855 | static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd) |
856 | { | |
857 | int rtn; | |
0bf8c869 | 858 | struct scsi_host_template *hostt = scmd->device->host->hostt; |
292148f8 | 859 | |
0bf8c869 | 860 | if (!hostt->eh_device_reset_handler) |
292148f8 BK |
861 | return FAILED; |
862 | ||
0bf8c869 | 863 | rtn = hostt->eh_device_reset_handler(scmd); |
30bd7df8 MC |
864 | if (rtn == SUCCESS) |
865 | __scsi_report_device_reset(scmd->device, NULL); | |
292148f8 BK |
866 | return rtn; |
867 | } | |
868 | ||
883a030f HR |
869 | /** |
870 | * scsi_try_to_abort_cmd - Ask host to abort a SCSI command | |
6583f6fb | 871 | * @hostt: SCSI driver host template |
883a030f HR |
872 | * @scmd: SCSI cmd used to send a target reset |
873 | * | |
874 | * Return value: | |
875 | * SUCCESS, FAILED, or FAST_IO_FAIL | |
876 | * | |
877 | * Notes: | |
878 | * SUCCESS does not necessarily indicate that the command | |
879 | * has been aborted; it only indicates that the LLDDs | |
880 | * has cleared all references to that command. | |
881 | * LLDDs should return FAILED only if an abort was required | |
882 | * but could not be executed. LLDDs should return FAST_IO_FAIL | |
883 | * if the device is temporarily unavailable (eg due to a | |
884 | * link down on FibreChannel) | |
885 | */ | |
886 | static int scsi_try_to_abort_cmd(struct scsi_host_template *hostt, | |
887 | struct scsi_cmnd *scmd) | |
292148f8 | 888 | { |
0bf8c869 | 889 | if (!hostt->eh_abort_handler) |
292148f8 BK |
890 | return FAILED; |
891 | ||
0bf8c869 | 892 | return hostt->eh_abort_handler(scmd); |
292148f8 BK |
893 | } |
894 | ||
292148f8 BK |
895 | static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd) |
896 | { | |
0bf8c869 | 897 | if (scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd) != SUCCESS) |
292148f8 | 898 | if (scsi_try_bus_device_reset(scmd) != SUCCESS) |
30bd7df8 MC |
899 | if (scsi_try_target_reset(scmd) != SUCCESS) |
900 | if (scsi_try_bus_reset(scmd) != SUCCESS) | |
901 | scsi_try_host_reset(scmd); | |
292148f8 BK |
902 | } |
903 | ||
1da177e4 | 904 | /** |
3b729f76 | 905 | * scsi_eh_prep_cmnd - Save a scsi command info as part of error recovery |
2dc611de | 906 | * @scmd: SCSI command structure to hijack |
e1c23468 | 907 | * @ses: structure to save restore information |
55db6c1b | 908 | * @cmnd: CDB to send. Can be NULL if no new cmnd is needed |
64a87b24 | 909 | * @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB) |
55db6c1b | 910 | * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored) |
2dc611de | 911 | * |
e1c23468 | 912 | * This function is used to save a scsi command information before re-execution |
55db6c1b BH |
913 | * as part of the error recovery process. If @sense_bytes is 0 the command |
914 | * sent must be one that does not transfer any data. If @sense_bytes != 0 | |
915 | * @cmnd is ignored and this functions sets up a REQUEST_SENSE command | |
916 | * and cmnd buffers to read @sense_bytes into @scmd->sense_buffer. | |
dc8875e1 | 917 | */ |
e1c23468 BH |
918 | void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, |
919 | unsigned char *cmnd, int cmnd_size, unsigned sense_bytes) | |
1da177e4 | 920 | { |
f59114b7 | 921 | struct scsi_device *sdev = scmd->device; |
1da177e4 | 922 | |
631c228c CH |
923 | /* |
924 | * We need saved copies of a number of fields - this is because | |
925 | * error handling may need to overwrite these with different values | |
926 | * to run different commands, and once error handling is complete, | |
927 | * we will need to restore these values prior to running the actual | |
928 | * command. | |
929 | */ | |
e1c23468 | 930 | ses->cmd_len = scmd->cmd_len; |
64a87b24 | 931 | ses->cmnd = scmd->cmnd; |
e1c23468 | 932 | ses->data_direction = scmd->sc_data_direction; |
30b0c37b | 933 | ses->sdb = scmd->sdb; |
6f9a35e2 | 934 | ses->next_rq = scmd->request->next_rq; |
e1c23468 | 935 | ses->result = scmd->result; |
12265709 | 936 | ses->underflow = scmd->underflow; |
db007fc5 | 937 | ses->prot_op = scmd->prot_op; |
631c228c | 938 | |
db007fc5 | 939 | scmd->prot_op = SCSI_PROT_NORMAL; |
c69e6f81 | 940 | scmd->eh_eflags = 0; |
64a87b24 BH |
941 | scmd->cmnd = ses->eh_cmnd; |
942 | memset(scmd->cmnd, 0, BLK_MAX_CDB); | |
30b0c37b | 943 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
6f9a35e2 | 944 | scmd->request->next_rq = NULL; |
644373a4 | 945 | scmd->result = 0; |
30b0c37b | 946 | |
55db6c1b | 947 | if (sense_bytes) { |
30b0c37b BH |
948 | scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE, |
949 | sense_bytes); | |
e1c23468 | 950 | sg_init_one(&ses->sense_sgl, scmd->sense_buffer, |
30b0c37b BH |
951 | scmd->sdb.length); |
952 | scmd->sdb.table.sgl = &ses->sense_sgl; | |
55db6c1b | 953 | scmd->sc_data_direction = DMA_FROM_DEVICE; |
30b0c37b | 954 | scmd->sdb.table.nents = 1; |
55db6c1b | 955 | scmd->cmnd[0] = REQUEST_SENSE; |
30b0c37b | 956 | scmd->cmnd[4] = scmd->sdb.length; |
55db6c1b | 957 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); |
631c228c | 958 | } else { |
631c228c | 959 | scmd->sc_data_direction = DMA_NONE; |
55db6c1b | 960 | if (cmnd) { |
64a87b24 | 961 | BUG_ON(cmnd_size > BLK_MAX_CDB); |
55db6c1b BH |
962 | memcpy(scmd->cmnd, cmnd, cmnd_size); |
963 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); | |
964 | } | |
631c228c CH |
965 | } |
966 | ||
967 | scmd->underflow = 0; | |
631c228c | 968 | |
55db6c1b | 969 | if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN) |
1da177e4 | 970 | scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) | |
f59114b7 | 971 | (sdev->lun << 5 & 0xe0); |
1da177e4 | 972 | |
631c228c CH |
973 | /* |
974 | * Zero the sense buffer. The scsi spec mandates that any | |
975 | * untransferred sense data should be interpreted as being zero. | |
976 | */ | |
b80ca4f7 | 977 | memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); |
e1c23468 BH |
978 | } |
979 | EXPORT_SYMBOL(scsi_eh_prep_cmnd); | |
980 | ||
981 | /** | |
3b729f76 | 982 | * scsi_eh_restore_cmnd - Restore a scsi command info as part of error recovery |
e1c23468 | 983 | * @scmd: SCSI command structure to restore |
477e608c | 984 | * @ses: saved information from a coresponding call to scsi_eh_prep_cmnd |
e1c23468 | 985 | * |
477e608c | 986 | * Undo any damage done by above scsi_eh_prep_cmnd(). |
dc8875e1 | 987 | */ |
e1c23468 BH |
988 | void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses) |
989 | { | |
990 | /* | |
991 | * Restore original data | |
992 | */ | |
993 | scmd->cmd_len = ses->cmd_len; | |
64a87b24 | 994 | scmd->cmnd = ses->cmnd; |
e1c23468 | 995 | scmd->sc_data_direction = ses->data_direction; |
30b0c37b | 996 | scmd->sdb = ses->sdb; |
6f9a35e2 | 997 | scmd->request->next_rq = ses->next_rq; |
e1c23468 | 998 | scmd->result = ses->result; |
12265709 | 999 | scmd->underflow = ses->underflow; |
db007fc5 | 1000 | scmd->prot_op = ses->prot_op; |
e1c23468 BH |
1001 | } |
1002 | EXPORT_SYMBOL(scsi_eh_restore_cmnd); | |
631c228c | 1003 | |
e1c23468 | 1004 | /** |
3b729f76 | 1005 | * scsi_send_eh_cmnd - submit a scsi command as part of error recovery |
e1c23468 BH |
1006 | * @scmd: SCSI command structure to hijack |
1007 | * @cmnd: CDB to send | |
1008 | * @cmnd_size: size in bytes of @cmnd | |
1009 | * @timeout: timeout for this request | |
1010 | * @sense_bytes: size of sense data to copy or 0 | |
1011 | * | |
1012 | * This function is used to send a scsi command down to a target device | |
1013 | * as part of the error recovery process. See also scsi_eh_prep_cmnd() above. | |
1014 | * | |
1015 | * Return value: | |
1016 | * SUCCESS or FAILED or NEEDS_RETRY | |
dc8875e1 | 1017 | */ |
e1c23468 BH |
1018 | static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd, |
1019 | int cmnd_size, int timeout, unsigned sense_bytes) | |
1020 | { | |
1021 | struct scsi_device *sdev = scmd->device; | |
1022 | struct Scsi_Host *shost = sdev->host; | |
1023 | DECLARE_COMPLETION_ONSTACK(done); | |
fc73648a | 1024 | unsigned long timeleft = timeout; |
e1c23468 | 1025 | struct scsi_eh_save ses; |
fc73648a | 1026 | const unsigned long stall_for = msecs_to_jiffies(100); |
e1c23468 BH |
1027 | int rtn; |
1028 | ||
fc73648a | 1029 | retry: |
e1c23468 | 1030 | scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes); |
7dfdc9a5 | 1031 | shost->eh_action = &done; |
1da177e4 | 1032 | |
1da177e4 | 1033 | scsi_log_send(scmd); |
f281233d | 1034 | scmd->scsi_done = scsi_eh_done; |
fc73648a HR |
1035 | rtn = shost->hostt->queuecommand(shost, scmd); |
1036 | if (rtn) { | |
1037 | if (timeleft > stall_for) { | |
1038 | scsi_eh_restore_cmnd(scmd, &ses); | |
1039 | timeleft -= stall_for; | |
1040 | msleep(jiffies_to_msecs(stall_for)); | |
1041 | goto retry; | |
1042 | } | |
1043 | /* signal not to enter either branch of the if () below */ | |
1044 | timeleft = 0; | |
511833ac | 1045 | rtn = FAILED; |
fc73648a HR |
1046 | } else { |
1047 | timeleft = wait_for_completion_timeout(&done, timeout); | |
ac61d195 | 1048 | rtn = SUCCESS; |
fc73648a | 1049 | } |
1da177e4 | 1050 | |
f59114b7 | 1051 | shost->eh_action = NULL; |
1da177e4 | 1052 | |
fc73648a | 1053 | scsi_log_completion(scmd, rtn); |
1da177e4 | 1054 | |
91921e01 HR |
1055 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
1056 | "%s: scmd: %p, timeleft: %ld\n", | |
cadbd4a5 | 1057 | __func__, scmd, timeleft)); |
1da177e4 LT |
1058 | |
1059 | /* | |
fc73648a HR |
1060 | * If there is time left scsi_eh_done got called, and we will examine |
1061 | * the actual status codes to see whether the command actually did | |
1062 | * complete normally, else if we have a zero return and no time left, | |
1063 | * the command must still be pending, so abort it and return FAILED. | |
1064 | * If we never actually managed to issue the command, because | |
1065 | * ->queuecommand() kept returning non zero, use the rtn = FAILED | |
1066 | * value above (so don't execute either branch of the if) | |
1da177e4 | 1067 | */ |
7dfdc9a5 | 1068 | if (timeleft) { |
1da177e4 | 1069 | rtn = scsi_eh_completed_normally(scmd); |
91921e01 HR |
1070 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
1071 | "%s: scsi_eh_completed_normally %x\n", __func__, rtn)); | |
7dfdc9a5 | 1072 | |
1da177e4 LT |
1073 | switch (rtn) { |
1074 | case SUCCESS: | |
1075 | case NEEDS_RETRY: | |
1076 | case FAILED: | |
1077 | break; | |
6e883b0e HR |
1078 | case ADD_TO_MLQUEUE: |
1079 | rtn = NEEDS_RETRY; | |
1080 | break; | |
1da177e4 LT |
1081 | default: |
1082 | rtn = FAILED; | |
1083 | break; | |
1084 | } | |
511833ac | 1085 | } else if (rtn != FAILED) { |
292148f8 | 1086 | scsi_abort_eh_cmnd(scmd); |
7dfdc9a5 | 1087 | rtn = FAILED; |
1da177e4 LT |
1088 | } |
1089 | ||
e1c23468 | 1090 | scsi_eh_restore_cmnd(scmd, &ses); |
18a4d0a2 | 1091 | |
1da177e4 LT |
1092 | return rtn; |
1093 | } | |
1094 | ||
1095 | /** | |
1096 | * scsi_request_sense - Request sense data from a particular target. | |
1097 | * @scmd: SCSI cmd for request sense. | |
1098 | * | |
1099 | * Notes: | |
1100 | * Some hosts automatically obtain this information, others require | |
1101 | * that we obtain it on our own. This function will *not* return until | |
1102 | * the command either times out, or it completes. | |
dc8875e1 | 1103 | */ |
1da177e4 LT |
1104 | static int scsi_request_sense(struct scsi_cmnd *scmd) |
1105 | { | |
0816c925 | 1106 | return scsi_send_eh_cmnd(scmd, NULL, 0, scmd->device->eh_timeout, ~0); |
1da177e4 LT |
1107 | } |
1108 | ||
2451079b JB |
1109 | static int scsi_eh_action(struct scsi_cmnd *scmd, int rtn) |
1110 | { | |
1111 | if (scmd->request->cmd_type != REQ_TYPE_BLOCK_PC) { | |
1112 | struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd); | |
1113 | if (sdrv->eh_action) | |
1114 | rtn = sdrv->eh_action(scmd, rtn); | |
1115 | } | |
1116 | return rtn; | |
1117 | } | |
1118 | ||
1da177e4 LT |
1119 | /** |
1120 | * scsi_eh_finish_cmd - Handle a cmd that eh is finished with. | |
1121 | * @scmd: Original SCSI cmd that eh has finished. | |
1122 | * @done_q: Queue for processed commands. | |
1123 | * | |
1124 | * Notes: | |
1125 | * We don't want to use the normal command completion while we are are | |
1126 | * still handling errors - it may cause other commands to be queued, | |
eb44820c | 1127 | * and that would disturb what we are doing. Thus we really want to |
1da177e4 LT |
1128 | * keep a list of pending commands for final completion, and once we |
1129 | * are ready to leave error handling we handle completion for real. | |
dc8875e1 | 1130 | */ |
041c5fc3 | 1131 | void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q) |
1da177e4 LT |
1132 | { |
1133 | scmd->device->host->host_failed--; | |
3111b0d1 | 1134 | scmd->eh_eflags = 0; |
1da177e4 LT |
1135 | list_move_tail(&scmd->eh_entry, done_q); |
1136 | } | |
041c5fc3 | 1137 | EXPORT_SYMBOL(scsi_eh_finish_cmd); |
1da177e4 LT |
1138 | |
1139 | /** | |
1140 | * scsi_eh_get_sense - Get device sense data. | |
1141 | * @work_q: Queue of commands to process. | |
eb44820c | 1142 | * @done_q: Queue of processed commands. |
1da177e4 LT |
1143 | * |
1144 | * Description: | |
1145 | * See if we need to request sense information. if so, then get it | |
0bf8c869 | 1146 | * now, so we have a better idea of what to do. |
1da177e4 LT |
1147 | * |
1148 | * Notes: | |
1149 | * This has the unfortunate side effect that if a shost adapter does | |
eb44820c | 1150 | * not automatically request sense information, we end up shutting |
1da177e4 LT |
1151 | * it down before we request it. |
1152 | * | |
1153 | * All drivers should request sense information internally these days, | |
1154 | * so for now all I have to say is tough noogies if you end up in here. | |
1155 | * | |
1156 | * XXX: Long term this code should go away, but that needs an audit of | |
1157 | * all LLDDs first. | |
dc8875e1 | 1158 | */ |
dca84e46 DW |
1159 | int scsi_eh_get_sense(struct list_head *work_q, |
1160 | struct list_head *done_q) | |
1da177e4 | 1161 | { |
937abeaa | 1162 | struct scsi_cmnd *scmd, *next; |
b4562022 | 1163 | struct Scsi_Host *shost; |
1da177e4 LT |
1164 | int rtn; |
1165 | ||
937abeaa | 1166 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 1167 | if ((scmd->eh_eflags & SCSI_EH_CANCEL_CMD) || |
1da177e4 LT |
1168 | SCSI_SENSE_VALID(scmd)) |
1169 | continue; | |
1170 | ||
b4562022 | 1171 | shost = scmd->device->host; |
b4562022 | 1172 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 | 1173 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1174 | scmd_printk(KERN_INFO, scmd, |
1175 | "%s: skip request sense, past eh deadline\n", | |
1176 | current->comm)); | |
b4562022 HR |
1177 | break; |
1178 | } | |
d555a2ab JB |
1179 | if (status_byte(scmd->result) != CHECK_CONDITION) |
1180 | /* | |
1181 | * don't request sense if there's no check condition | |
1182 | * status because the error we're processing isn't one | |
1183 | * that has a sense code (and some devices get | |
1184 | * confused by sense requests out of the blue) | |
1185 | */ | |
1186 | continue; | |
1187 | ||
3bf743e7 JG |
1188 | SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd, |
1189 | "%s: requesting sense\n", | |
1190 | current->comm)); | |
1da177e4 LT |
1191 | rtn = scsi_request_sense(scmd); |
1192 | if (rtn != SUCCESS) | |
1193 | continue; | |
1194 | ||
91921e01 HR |
1195 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
1196 | "sense requested for %p result %x\n", | |
1197 | scmd, scmd->result)); | |
d811b848 | 1198 | SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense(scmd)); |
1da177e4 LT |
1199 | |
1200 | rtn = scsi_decide_disposition(scmd); | |
1201 | ||
1202 | /* | |
1203 | * if the result was normal, then just pass it along to the | |
1204 | * upper level. | |
1205 | */ | |
1206 | if (rtn == SUCCESS) | |
1207 | /* we don't want this command reissued, just | |
1208 | * finished with the sense data, so set | |
1209 | * retries to the max allowed to ensure it | |
1210 | * won't get reissued */ | |
1211 | scmd->retries = scmd->allowed; | |
1212 | else if (rtn != NEEDS_RETRY) | |
1213 | continue; | |
1214 | ||
1215 | scsi_eh_finish_cmd(scmd, done_q); | |
1216 | } | |
1217 | ||
1218 | return list_empty(work_q); | |
1219 | } | |
dca84e46 | 1220 | EXPORT_SYMBOL_GPL(scsi_eh_get_sense); |
1da177e4 | 1221 | |
1da177e4 LT |
1222 | /** |
1223 | * scsi_eh_tur - Send TUR to device. | |
eb44820c | 1224 | * @scmd: &scsi_cmnd to send TUR |
1da177e4 LT |
1225 | * |
1226 | * Return value: | |
1227 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1228 | */ |
1da177e4 LT |
1229 | static int scsi_eh_tur(struct scsi_cmnd *scmd) |
1230 | { | |
1231 | static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0}; | |
1232 | int retry_cnt = 1, rtn; | |
1233 | ||
1234 | retry_tur: | |
0816c925 MP |
1235 | rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, |
1236 | scmd->device->eh_timeout, 0); | |
1da177e4 | 1237 | |
91921e01 HR |
1238 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
1239 | "%s: scmd %p rtn %x\n", __func__, scmd, rtn)); | |
631c228c CH |
1240 | |
1241 | switch (rtn) { | |
1242 | case NEEDS_RETRY: | |
1da177e4 LT |
1243 | if (retry_cnt--) |
1244 | goto retry_tur; | |
631c228c CH |
1245 | /*FALLTHRU*/ |
1246 | case SUCCESS: | |
e47373ec | 1247 | return 0; |
631c228c CH |
1248 | default: |
1249 | return 1; | |
e47373ec | 1250 | } |
1da177e4 LT |
1251 | } |
1252 | ||
3eef6257 DJ |
1253 | /** |
1254 | * scsi_eh_test_devices - check if devices are responding from error recovery. | |
1255 | * @cmd_list: scsi commands in error recovery. | |
74cf298f RD |
1256 | * @work_q: queue for commands which still need more error recovery |
1257 | * @done_q: queue for commands which are finished | |
1258 | * @try_stu: boolean on if a STU command should be tried in addition to TUR. | |
3eef6257 DJ |
1259 | * |
1260 | * Decription: | |
1261 | * Tests if devices are in a working state. Commands to devices now in | |
1262 | * a working state are sent to the done_q while commands to devices which | |
1263 | * are still failing to respond are returned to the work_q for more | |
1264 | * processing. | |
1265 | **/ | |
1266 | static int scsi_eh_test_devices(struct list_head *cmd_list, | |
1267 | struct list_head *work_q, | |
1268 | struct list_head *done_q, int try_stu) | |
1269 | { | |
1270 | struct scsi_cmnd *scmd, *next; | |
1271 | struct scsi_device *sdev; | |
1272 | int finish_cmds; | |
1273 | ||
1274 | while (!list_empty(cmd_list)) { | |
1275 | scmd = list_entry(cmd_list->next, struct scsi_cmnd, eh_entry); | |
1276 | sdev = scmd->device; | |
1277 | ||
b4562022 | 1278 | if (!try_stu) { |
b4562022 HR |
1279 | if (scsi_host_eh_past_deadline(sdev->host)) { |
1280 | /* Push items back onto work_q */ | |
1281 | list_splice_init(cmd_list, work_q); | |
b4562022 | 1282 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1283 | sdev_printk(KERN_INFO, sdev, |
1284 | "%s: skip test device, past eh deadline", | |
1285 | current->comm)); | |
b4562022 HR |
1286 | break; |
1287 | } | |
b4562022 HR |
1288 | } |
1289 | ||
3eef6257 DJ |
1290 | finish_cmds = !scsi_device_online(scmd->device) || |
1291 | (try_stu && !scsi_eh_try_stu(scmd) && | |
1292 | !scsi_eh_tur(scmd)) || | |
1293 | !scsi_eh_tur(scmd); | |
1294 | ||
1295 | list_for_each_entry_safe(scmd, next, cmd_list, eh_entry) | |
1296 | if (scmd->device == sdev) { | |
2451079b JB |
1297 | if (finish_cmds && |
1298 | (try_stu || | |
1299 | scsi_eh_action(scmd, SUCCESS) == SUCCESS)) | |
3eef6257 DJ |
1300 | scsi_eh_finish_cmd(scmd, done_q); |
1301 | else | |
1302 | list_move_tail(&scmd->eh_entry, work_q); | |
1303 | } | |
1304 | } | |
1305 | return list_empty(work_q); | |
1306 | } | |
1307 | ||
1308 | ||
1da177e4 | 1309 | /** |
eb44820c RL |
1310 | * scsi_eh_abort_cmds - abort pending commands. |
1311 | * @work_q: &list_head for pending commands. | |
1312 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1313 | * |
1314 | * Decription: | |
1315 | * Try and see whether or not it makes sense to try and abort the | |
eb44820c RL |
1316 | * running command. This only works out to be the case if we have one |
1317 | * command that has timed out. If the command simply failed, it makes | |
1da177e4 LT |
1318 | * no sense to try and abort the command, since as far as the shost |
1319 | * adapter is concerned, it isn't running. | |
dc8875e1 | 1320 | */ |
1da177e4 LT |
1321 | static int scsi_eh_abort_cmds(struct list_head *work_q, |
1322 | struct list_head *done_q) | |
1323 | { | |
937abeaa | 1324 | struct scsi_cmnd *scmd, *next; |
3eef6257 | 1325 | LIST_HEAD(check_list); |
1da177e4 | 1326 | int rtn; |
b4562022 | 1327 | struct Scsi_Host *shost; |
1da177e4 | 1328 | |
937abeaa | 1329 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 1330 | if (!(scmd->eh_eflags & SCSI_EH_CANCEL_CMD)) |
1da177e4 | 1331 | continue; |
b4562022 | 1332 | shost = scmd->device->host; |
b4562022 | 1333 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 HR |
1334 | list_splice_init(&check_list, work_q); |
1335 | SCSI_LOG_ERROR_RECOVERY(3, | |
a222b1e2 HR |
1336 | scmd_printk(KERN_INFO, scmd, |
1337 | "%s: skip aborting cmd, past eh deadline\n", | |
1338 | current->comm)); | |
b4562022 HR |
1339 | return list_empty(work_q); |
1340 | } | |
91921e01 | 1341 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1342 | scmd_printk(KERN_INFO, scmd, |
1343 | "%s: aborting cmd\n", current->comm)); | |
b4562022 | 1344 | rtn = scsi_try_to_abort_cmd(shost->hostt, scmd); |
6fd046f9 | 1345 | if (rtn == FAILED) { |
91921e01 | 1346 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1347 | scmd_printk(KERN_INFO, scmd, |
1348 | "%s: aborting cmd failed\n", | |
1349 | current->comm)); | |
6fd046f9 HR |
1350 | list_splice_init(&check_list, work_q); |
1351 | return list_empty(work_q); | |
1352 | } | |
1353 | scmd->eh_eflags &= ~SCSI_EH_CANCEL_CMD; | |
1354 | if (rtn == FAST_IO_FAIL) | |
1355 | scsi_eh_finish_cmd(scmd, done_q); | |
1356 | else | |
1357 | list_move_tail(&scmd->eh_entry, &check_list); | |
1da177e4 LT |
1358 | } |
1359 | ||
3eef6257 | 1360 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4 LT |
1361 | } |
1362 | ||
1da177e4 LT |
1363 | /** |
1364 | * scsi_eh_try_stu - Send START_UNIT to device. | |
eb44820c | 1365 | * @scmd: &scsi_cmnd to send START_UNIT |
1da177e4 LT |
1366 | * |
1367 | * Return value: | |
1368 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1369 | */ |
1da177e4 LT |
1370 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd) |
1371 | { | |
1372 | static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0}; | |
1da177e4 | 1373 | |
631c228c | 1374 | if (scmd->device->allow_restart) { |
ed773e66 BK |
1375 | int i, rtn = NEEDS_RETRY; |
1376 | ||
1377 | for (i = 0; rtn == NEEDS_RETRY && i < 2; i++) | |
9728c081 | 1378 | rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0); |
1da177e4 | 1379 | |
631c228c CH |
1380 | if (rtn == SUCCESS) |
1381 | return 0; | |
1382 | } | |
1da177e4 | 1383 | |
1da177e4 LT |
1384 | return 1; |
1385 | } | |
1386 | ||
1387 | /** | |
1388 | * scsi_eh_stu - send START_UNIT if needed | |
eb44820c | 1389 | * @shost: &scsi host being recovered. |
74cf298f | 1390 | * @work_q: &list_head for pending commands. |
eb44820c | 1391 | * @done_q: &list_head for processed commands. |
1da177e4 LT |
1392 | * |
1393 | * Notes: | |
1394 | * If commands are failing due to not ready, initializing command required, | |
0bf8c869 | 1395 | * try revalidating the device, which will end up sending a start unit. |
dc8875e1 | 1396 | */ |
1da177e4 LT |
1397 | static int scsi_eh_stu(struct Scsi_Host *shost, |
1398 | struct list_head *work_q, | |
1399 | struct list_head *done_q) | |
1400 | { | |
937abeaa | 1401 | struct scsi_cmnd *scmd, *stu_scmd, *next; |
1da177e4 LT |
1402 | struct scsi_device *sdev; |
1403 | ||
1404 | shost_for_each_device(sdev, shost) { | |
b4562022 | 1405 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 | 1406 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1407 | sdev_printk(KERN_INFO, sdev, |
1408 | "%s: skip START_UNIT, past eh deadline\n", | |
1409 | current->comm)); | |
b4562022 HR |
1410 | break; |
1411 | } | |
1da177e4 LT |
1412 | stu_scmd = NULL; |
1413 | list_for_each_entry(scmd, work_q, eh_entry) | |
1414 | if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) && | |
1415 | scsi_check_sense(scmd) == FAILED ) { | |
1416 | stu_scmd = scmd; | |
1417 | break; | |
1418 | } | |
1419 | ||
1420 | if (!stu_scmd) | |
1421 | continue; | |
1422 | ||
91921e01 | 1423 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1424 | sdev_printk(KERN_INFO, sdev, |
1425 | "%s: Sending START_UNIT\n", | |
1426 | current->comm)); | |
1da177e4 LT |
1427 | |
1428 | if (!scsi_eh_try_stu(stu_scmd)) { | |
1429 | if (!scsi_device_online(sdev) || | |
1430 | !scsi_eh_tur(stu_scmd)) { | |
937abeaa CH |
1431 | list_for_each_entry_safe(scmd, next, |
1432 | work_q, eh_entry) { | |
2451079b JB |
1433 | if (scmd->device == sdev && |
1434 | scsi_eh_action(scmd, SUCCESS) == SUCCESS) | |
1da177e4 LT |
1435 | scsi_eh_finish_cmd(scmd, done_q); |
1436 | } | |
1437 | } | |
1438 | } else { | |
1439 | SCSI_LOG_ERROR_RECOVERY(3, | |
a222b1e2 HR |
1440 | sdev_printk(KERN_INFO, sdev, |
1441 | "%s: START_UNIT failed\n", | |
1442 | current->comm)); | |
1da177e4 LT |
1443 | } |
1444 | } | |
1445 | ||
1446 | return list_empty(work_q); | |
1447 | } | |
1448 | ||
1449 | ||
1450 | /** | |
1451 | * scsi_eh_bus_device_reset - send bdr if needed | |
1452 | * @shost: scsi host being recovered. | |
74cf298f | 1453 | * @work_q: &list_head for pending commands. |
eb44820c | 1454 | * @done_q: &list_head for processed commands. |
1da177e4 LT |
1455 | * |
1456 | * Notes: | |
eb44820c | 1457 | * Try a bus device reset. Still, look to see whether we have multiple |
1da177e4 LT |
1458 | * devices that are jammed or not - if we have multiple devices, it |
1459 | * makes no sense to try bus_device_reset - we really would need to try | |
0bf8c869 | 1460 | * a bus_reset instead. |
dc8875e1 | 1461 | */ |
1da177e4 LT |
1462 | static int scsi_eh_bus_device_reset(struct Scsi_Host *shost, |
1463 | struct list_head *work_q, | |
1464 | struct list_head *done_q) | |
1465 | { | |
937abeaa | 1466 | struct scsi_cmnd *scmd, *bdr_scmd, *next; |
1da177e4 LT |
1467 | struct scsi_device *sdev; |
1468 | int rtn; | |
1469 | ||
1470 | shost_for_each_device(sdev, shost) { | |
b4562022 | 1471 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 | 1472 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1473 | sdev_printk(KERN_INFO, sdev, |
1474 | "%s: skip BDR, past eh deadline\n", | |
1475 | current->comm)); | |
b4562022 HR |
1476 | break; |
1477 | } | |
1da177e4 LT |
1478 | bdr_scmd = NULL; |
1479 | list_for_each_entry(scmd, work_q, eh_entry) | |
1480 | if (scmd->device == sdev) { | |
1481 | bdr_scmd = scmd; | |
1482 | break; | |
1483 | } | |
1484 | ||
1485 | if (!bdr_scmd) | |
1486 | continue; | |
1487 | ||
91921e01 | 1488 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1489 | sdev_printk(KERN_INFO, sdev, |
1490 | "%s: Sending BDR\n", current->comm)); | |
1da177e4 | 1491 | rtn = scsi_try_bus_device_reset(bdr_scmd); |
2f2eb587 | 1492 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
1da177e4 | 1493 | if (!scsi_device_online(sdev) || |
2f2eb587 | 1494 | rtn == FAST_IO_FAIL || |
1da177e4 | 1495 | !scsi_eh_tur(bdr_scmd)) { |
937abeaa CH |
1496 | list_for_each_entry_safe(scmd, next, |
1497 | work_q, eh_entry) { | |
2451079b JB |
1498 | if (scmd->device == sdev && |
1499 | scsi_eh_action(scmd, rtn) != FAILED) | |
1da177e4 LT |
1500 | scsi_eh_finish_cmd(scmd, |
1501 | done_q); | |
1502 | } | |
1503 | } | |
1504 | } else { | |
91921e01 | 1505 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1506 | sdev_printk(KERN_INFO, sdev, |
1507 | "%s: BDR failed\n", current->comm)); | |
1da177e4 LT |
1508 | } |
1509 | } | |
1510 | ||
1511 | return list_empty(work_q); | |
1512 | } | |
1513 | ||
30bd7df8 MC |
1514 | /** |
1515 | * scsi_eh_target_reset - send target reset if needed | |
1516 | * @shost: scsi host being recovered. | |
74cf298f | 1517 | * @work_q: &list_head for pending commands. |
30bd7df8 MC |
1518 | * @done_q: &list_head for processed commands. |
1519 | * | |
1520 | * Notes: | |
1521 | * Try a target reset. | |
1522 | */ | |
1523 | static int scsi_eh_target_reset(struct Scsi_Host *shost, | |
1524 | struct list_head *work_q, | |
1525 | struct list_head *done_q) | |
1526 | { | |
98db5195 | 1527 | LIST_HEAD(tmp_list); |
3eef6257 | 1528 | LIST_HEAD(check_list); |
30bd7df8 | 1529 | |
98db5195 JB |
1530 | list_splice_init(work_q, &tmp_list); |
1531 | ||
1532 | while (!list_empty(&tmp_list)) { | |
1533 | struct scsi_cmnd *next, *scmd; | |
1534 | int rtn; | |
1535 | unsigned int id; | |
b4562022 | 1536 | |
b4562022 | 1537 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 HR |
1538 | /* push back on work queue for further processing */ |
1539 | list_splice_init(&check_list, work_q); | |
1540 | list_splice_init(&tmp_list, work_q); | |
1541 | SCSI_LOG_ERROR_RECOVERY(3, | |
1542 | shost_printk(KERN_INFO, shost, | |
a222b1e2 HR |
1543 | "%s: Skip target reset, past eh deadline\n", |
1544 | current->comm)); | |
b4562022 HR |
1545 | return list_empty(work_q); |
1546 | } | |
98db5195 JB |
1547 | |
1548 | scmd = list_entry(tmp_list.next, struct scsi_cmnd, eh_entry); | |
1549 | id = scmd_id(scmd); | |
30bd7df8 | 1550 | |
91921e01 HR |
1551 | SCSI_LOG_ERROR_RECOVERY(3, |
1552 | shost_printk(KERN_INFO, shost, | |
1553 | "%s: Sending target reset to target %d\n", | |
1554 | current->comm, id)); | |
98db5195 JB |
1555 | rtn = scsi_try_target_reset(scmd); |
1556 | if (rtn != SUCCESS && rtn != FAST_IO_FAIL) | |
91921e01 HR |
1557 | SCSI_LOG_ERROR_RECOVERY(3, |
1558 | shost_printk(KERN_INFO, shost, | |
1559 | "%s: Target reset failed" | |
1560 | " target: %d\n", | |
1561 | current->comm, id)); | |
98db5195 JB |
1562 | list_for_each_entry_safe(scmd, next, &tmp_list, eh_entry) { |
1563 | if (scmd_id(scmd) != id) | |
1564 | continue; | |
1565 | ||
3eef6257 DJ |
1566 | if (rtn == SUCCESS) |
1567 | list_move_tail(&scmd->eh_entry, &check_list); | |
1568 | else if (rtn == FAST_IO_FAIL) | |
98db5195 JB |
1569 | scsi_eh_finish_cmd(scmd, done_q); |
1570 | else | |
1571 | /* push back on work queue for further processing */ | |
1572 | list_move(&scmd->eh_entry, work_q); | |
1573 | } | |
1574 | } | |
30bd7df8 | 1575 | |
3eef6257 | 1576 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
30bd7df8 MC |
1577 | } |
1578 | ||
1da177e4 | 1579 | /** |
0bf8c869 | 1580 | * scsi_eh_bus_reset - send a bus reset |
eb44820c | 1581 | * @shost: &scsi host being recovered. |
74cf298f | 1582 | * @work_q: &list_head for pending commands. |
eb44820c | 1583 | * @done_q: &list_head for processed commands. |
dc8875e1 | 1584 | */ |
1da177e4 LT |
1585 | static int scsi_eh_bus_reset(struct Scsi_Host *shost, |
1586 | struct list_head *work_q, | |
1587 | struct list_head *done_q) | |
1588 | { | |
937abeaa | 1589 | struct scsi_cmnd *scmd, *chan_scmd, *next; |
3eef6257 | 1590 | LIST_HEAD(check_list); |
1da177e4 LT |
1591 | unsigned int channel; |
1592 | int rtn; | |
1593 | ||
1594 | /* | |
1595 | * we really want to loop over the various channels, and do this on | |
1596 | * a channel by channel basis. we should also check to see if any | |
1597 | * of the failed commands are on soft_reset devices, and if so, skip | |
0bf8c869 | 1598 | * the reset. |
1da177e4 LT |
1599 | */ |
1600 | ||
1601 | for (channel = 0; channel <= shost->max_channel; channel++) { | |
b4562022 | 1602 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 HR |
1603 | list_splice_init(&check_list, work_q); |
1604 | SCSI_LOG_ERROR_RECOVERY(3, | |
1605 | shost_printk(KERN_INFO, shost, | |
a222b1e2 HR |
1606 | "%s: skip BRST, past eh deadline\n", |
1607 | current->comm)); | |
b4562022 HR |
1608 | return list_empty(work_q); |
1609 | } | |
b4562022 | 1610 | |
1da177e4 LT |
1611 | chan_scmd = NULL; |
1612 | list_for_each_entry(scmd, work_q, eh_entry) { | |
422c0d61 | 1613 | if (channel == scmd_channel(scmd)) { |
1da177e4 LT |
1614 | chan_scmd = scmd; |
1615 | break; | |
1616 | /* | |
1617 | * FIXME add back in some support for | |
1618 | * soft_reset devices. | |
1619 | */ | |
1620 | } | |
1621 | } | |
1622 | ||
1623 | if (!chan_scmd) | |
1624 | continue; | |
91921e01 HR |
1625 | SCSI_LOG_ERROR_RECOVERY(3, |
1626 | shost_printk(KERN_INFO, shost, | |
1627 | "%s: Sending BRST chan: %d\n", | |
1628 | current->comm, channel)); | |
1da177e4 | 1629 | rtn = scsi_try_bus_reset(chan_scmd); |
2f2eb587 | 1630 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
937abeaa | 1631 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3eef6257 DJ |
1632 | if (channel == scmd_channel(scmd)) { |
1633 | if (rtn == FAST_IO_FAIL) | |
1da177e4 LT |
1634 | scsi_eh_finish_cmd(scmd, |
1635 | done_q); | |
3eef6257 DJ |
1636 | else |
1637 | list_move_tail(&scmd->eh_entry, | |
1638 | &check_list); | |
1639 | } | |
1da177e4 LT |
1640 | } |
1641 | } else { | |
91921e01 HR |
1642 | SCSI_LOG_ERROR_RECOVERY(3, |
1643 | shost_printk(KERN_INFO, shost, | |
1644 | "%s: BRST failed chan: %d\n", | |
1645 | current->comm, channel)); | |
1da177e4 LT |
1646 | } |
1647 | } | |
3eef6257 | 1648 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4 LT |
1649 | } |
1650 | ||
1651 | /** | |
0bf8c869 | 1652 | * scsi_eh_host_reset - send a host reset |
74cf298f RD |
1653 | * @shost: host to be reset. |
1654 | * @work_q: &list_head for pending commands. | |
1655 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1656 | */ |
91921e01 HR |
1657 | static int scsi_eh_host_reset(struct Scsi_Host *shost, |
1658 | struct list_head *work_q, | |
1da177e4 LT |
1659 | struct list_head *done_q) |
1660 | { | |
937abeaa | 1661 | struct scsi_cmnd *scmd, *next; |
3eef6257 | 1662 | LIST_HEAD(check_list); |
1da177e4 | 1663 | int rtn; |
1da177e4 LT |
1664 | |
1665 | if (!list_empty(work_q)) { | |
1666 | scmd = list_entry(work_q->next, | |
1667 | struct scsi_cmnd, eh_entry); | |
1668 | ||
91921e01 HR |
1669 | SCSI_LOG_ERROR_RECOVERY(3, |
1670 | shost_printk(KERN_INFO, shost, | |
1671 | "%s: Sending HRST\n", | |
1672 | current->comm)); | |
1da177e4 LT |
1673 | |
1674 | rtn = scsi_try_host_reset(scmd); | |
3eef6257 DJ |
1675 | if (rtn == SUCCESS) { |
1676 | list_splice_init(work_q, &check_list); | |
1677 | } else if (rtn == FAST_IO_FAIL) { | |
937abeaa | 1678 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1da177e4 LT |
1679 | scsi_eh_finish_cmd(scmd, done_q); |
1680 | } | |
1681 | } else { | |
91921e01 HR |
1682 | SCSI_LOG_ERROR_RECOVERY(3, |
1683 | shost_printk(KERN_INFO, shost, | |
1684 | "%s: HRST failed\n", | |
1685 | current->comm)); | |
1da177e4 LT |
1686 | } |
1687 | } | |
3eef6257 | 1688 | return scsi_eh_test_devices(&check_list, work_q, done_q, 1); |
1da177e4 LT |
1689 | } |
1690 | ||
1691 | /** | |
1692 | * scsi_eh_offline_sdevs - offline scsi devices that fail to recover | |
74cf298f RD |
1693 | * @work_q: &list_head for pending commands. |
1694 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1695 | */ |
1da177e4 LT |
1696 | static void scsi_eh_offline_sdevs(struct list_head *work_q, |
1697 | struct list_head *done_q) | |
1698 | { | |
937abeaa | 1699 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1700 | |
937abeaa | 1701 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
31765d7d MW |
1702 | sdev_printk(KERN_INFO, scmd->device, "Device offlined - " |
1703 | "not ready after error recovery\n"); | |
1da177e4 | 1704 | scsi_device_set_state(scmd->device, SDEV_OFFLINE); |
3111b0d1 | 1705 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) { |
1da177e4 LT |
1706 | /* |
1707 | * FIXME: Handle lost cmds. | |
1708 | */ | |
1709 | } | |
1710 | scsi_eh_finish_cmd(scmd, done_q); | |
1711 | } | |
1712 | return; | |
1713 | } | |
1714 | ||
4a27446f | 1715 | /** |
e494f6a7 | 1716 | * scsi_noretry_cmd - determine if command should be failed fast |
4a27446f MC |
1717 | * @scmd: SCSI cmd to examine. |
1718 | */ | |
1719 | int scsi_noretry_cmd(struct scsi_cmnd *scmd) | |
1720 | { | |
1721 | switch (host_byte(scmd->result)) { | |
1722 | case DID_OK: | |
1723 | break; | |
e494f6a7 HR |
1724 | case DID_TIME_OUT: |
1725 | goto check_type; | |
4a27446f | 1726 | case DID_BUS_BUSY: |
33659ebb | 1727 | return (scmd->request->cmd_flags & REQ_FAILFAST_TRANSPORT); |
4a27446f | 1728 | case DID_PARITY: |
33659ebb | 1729 | return (scmd->request->cmd_flags & REQ_FAILFAST_DEV); |
4a27446f MC |
1730 | case DID_ERROR: |
1731 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1732 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1733 | return 0; | |
1734 | /* fall through */ | |
1735 | case DID_SOFT_ERROR: | |
33659ebb | 1736 | return (scmd->request->cmd_flags & REQ_FAILFAST_DRIVER); |
4a27446f MC |
1737 | } |
1738 | ||
e494f6a7 HR |
1739 | if (status_byte(scmd->result) != CHECK_CONDITION) |
1740 | return 0; | |
4a27446f | 1741 | |
e494f6a7 HR |
1742 | check_type: |
1743 | /* | |
1744 | * assume caller has checked sense and determined | |
1745 | * the check condition was retryable. | |
1746 | */ | |
1747 | if (scmd->request->cmd_flags & REQ_FAILFAST_DEV || | |
1748 | scmd->request->cmd_type == REQ_TYPE_BLOCK_PC) | |
1749 | return 1; | |
1750 | else | |
1751 | return 0; | |
4a27446f MC |
1752 | } |
1753 | ||
1da177e4 LT |
1754 | /** |
1755 | * scsi_decide_disposition - Disposition a cmd on return from LLD. | |
1756 | * @scmd: SCSI cmd to examine. | |
1757 | * | |
1758 | * Notes: | |
1759 | * This is *only* called when we are examining the status after sending | |
1760 | * out the actual data command. any commands that are queued for error | |
1761 | * recovery (e.g. test_unit_ready) do *not* come through here. | |
1762 | * | |
1763 | * When this routine returns failed, it means the error handler thread | |
1764 | * is woken. In cases where the error code indicates an error that | |
1765 | * doesn't require the error handler read (i.e. we don't need to | |
1766 | * abort/reset), this function should return SUCCESS. | |
dc8875e1 | 1767 | */ |
1da177e4 LT |
1768 | int scsi_decide_disposition(struct scsi_cmnd *scmd) |
1769 | { | |
1770 | int rtn; | |
1771 | ||
1772 | /* | |
1773 | * if the device is offline, then we clearly just pass the result back | |
1774 | * up to the top level. | |
1775 | */ | |
1776 | if (!scsi_device_online(scmd->device)) { | |
91921e01 HR |
1777 | SCSI_LOG_ERROR_RECOVERY(5, scmd_printk(KERN_INFO, scmd, |
1778 | "%s: device offline - report as SUCCESS\n", __func__)); | |
1da177e4 LT |
1779 | return SUCCESS; |
1780 | } | |
1781 | ||
1782 | /* | |
1783 | * first check the host byte, to see if there is anything in there | |
1784 | * that would indicate what we need to do. | |
1785 | */ | |
1786 | switch (host_byte(scmd->result)) { | |
1787 | case DID_PASSTHROUGH: | |
1788 | /* | |
1789 | * no matter what, pass this through to the upper layer. | |
1790 | * nuke this special code so that it looks like we are saying | |
1791 | * did_ok. | |
1792 | */ | |
1793 | scmd->result &= 0xff00ffff; | |
1794 | return SUCCESS; | |
1795 | case DID_OK: | |
1796 | /* | |
1797 | * looks good. drop through, and check the next byte. | |
1798 | */ | |
1799 | break; | |
e494f6a7 HR |
1800 | case DID_ABORT: |
1801 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) { | |
8922a908 | 1802 | set_host_byte(scmd, DID_TIME_OUT); |
e494f6a7 HR |
1803 | return SUCCESS; |
1804 | } | |
1da177e4 LT |
1805 | case DID_NO_CONNECT: |
1806 | case DID_BAD_TARGET: | |
1da177e4 LT |
1807 | /* |
1808 | * note - this means that we just report the status back | |
1809 | * to the top level driver, not that we actually think | |
1810 | * that it indicates SUCCESS. | |
1811 | */ | |
1812 | return SUCCESS; | |
1813 | /* | |
1814 | * when the low level driver returns did_soft_error, | |
0bf8c869 | 1815 | * it is responsible for keeping an internal retry counter |
1da177e4 LT |
1816 | * in order to avoid endless loops (db) |
1817 | * | |
1818 | * actually this is a bug in this function here. we should | |
1819 | * be mindful of the maximum number of retries specified | |
1820 | * and not get stuck in a loop. | |
1821 | */ | |
1822 | case DID_SOFT_ERROR: | |
1823 | goto maybe_retry; | |
1824 | case DID_IMM_RETRY: | |
1825 | return NEEDS_RETRY; | |
1826 | ||
bf341919 JB |
1827 | case DID_REQUEUE: |
1828 | return ADD_TO_MLQUEUE; | |
a4dfaa6f MC |
1829 | case DID_TRANSPORT_DISRUPTED: |
1830 | /* | |
1831 | * LLD/transport was disrupted during processing of the IO. | |
1832 | * The transport class is now blocked/blocking, | |
1833 | * and the transport will decide what to do with the IO | |
939c2288 MC |
1834 | * based on its timers and recovery capablilities if |
1835 | * there are enough retries. | |
a4dfaa6f | 1836 | */ |
939c2288 | 1837 | goto maybe_retry; |
a4dfaa6f MC |
1838 | case DID_TRANSPORT_FAILFAST: |
1839 | /* | |
1840 | * The transport decided to failfast the IO (most likely | |
1841 | * the fast io fail tmo fired), so send IO directly upwards. | |
1842 | */ | |
1843 | return SUCCESS; | |
1da177e4 LT |
1844 | case DID_ERROR: |
1845 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1846 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1847 | /* | |
1848 | * execute reservation conflict processing code | |
1849 | * lower down | |
1850 | */ | |
1851 | break; | |
1852 | /* fallthrough */ | |
1da177e4 LT |
1853 | case DID_BUS_BUSY: |
1854 | case DID_PARITY: | |
1855 | goto maybe_retry; | |
1856 | case DID_TIME_OUT: | |
1857 | /* | |
1858 | * when we scan the bus, we get timeout messages for | |
1859 | * these commands if there is no device available. | |
1860 | * other hosts report did_no_connect for the same thing. | |
1861 | */ | |
1862 | if ((scmd->cmnd[0] == TEST_UNIT_READY || | |
1863 | scmd->cmnd[0] == INQUIRY)) { | |
1864 | return SUCCESS; | |
1865 | } else { | |
1866 | return FAILED; | |
1867 | } | |
1868 | case DID_RESET: | |
1869 | return SUCCESS; | |
1870 | default: | |
1871 | return FAILED; | |
1872 | } | |
1873 | ||
1874 | /* | |
1875 | * next, check the message byte. | |
1876 | */ | |
1877 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
1878 | return FAILED; | |
1879 | ||
1880 | /* | |
1881 | * check the status byte to see if this indicates anything special. | |
1882 | */ | |
1883 | switch (status_byte(scmd->result)) { | |
1884 | case QUEUE_FULL: | |
42a6a918 | 1885 | scsi_handle_queue_full(scmd->device); |
1da177e4 LT |
1886 | /* |
1887 | * the case of trying to send too many commands to a | |
1888 | * tagged queueing device. | |
1889 | */ | |
1890 | case BUSY: | |
1891 | /* | |
1892 | * device can't talk to us at the moment. Should only | |
1893 | * occur (SAM-3) when the task queue is empty, so will cause | |
1894 | * the empty queue handling to trigger a stall in the | |
1895 | * device. | |
1896 | */ | |
1897 | return ADD_TO_MLQUEUE; | |
1898 | case GOOD: | |
279afdfe EM |
1899 | if (scmd->cmnd[0] == REPORT_LUNS) |
1900 | scmd->device->sdev_target->expecting_lun_change = 0; | |
4a84067d | 1901 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 | 1902 | case COMMAND_TERMINATED: |
1da177e4 | 1903 | return SUCCESS; |
a9b589d9 VB |
1904 | case TASK_ABORTED: |
1905 | goto maybe_retry; | |
1da177e4 LT |
1906 | case CHECK_CONDITION: |
1907 | rtn = scsi_check_sense(scmd); | |
1908 | if (rtn == NEEDS_RETRY) | |
1909 | goto maybe_retry; | |
1910 | /* if rtn == FAILED, we have no sense information; | |
1911 | * returning FAILED will wake the error handler thread | |
1912 | * to collect the sense and redo the decide | |
1913 | * disposition */ | |
1914 | return rtn; | |
1915 | case CONDITION_GOOD: | |
1916 | case INTERMEDIATE_GOOD: | |
1917 | case INTERMEDIATE_C_GOOD: | |
1918 | case ACA_ACTIVE: | |
1919 | /* | |
1920 | * who knows? FIXME(eric) | |
1921 | */ | |
1922 | return SUCCESS; | |
1923 | ||
1924 | case RESERVATION_CONFLICT: | |
9ccfc756 JB |
1925 | sdev_printk(KERN_INFO, scmd->device, |
1926 | "reservation conflict\n"); | |
2082ebc4 | 1927 | set_host_byte(scmd, DID_NEXUS_FAILURE); |
1da177e4 LT |
1928 | return SUCCESS; /* causes immediate i/o error */ |
1929 | default: | |
1930 | return FAILED; | |
1931 | } | |
1932 | return FAILED; | |
1933 | ||
1934 | maybe_retry: | |
1935 | ||
1936 | /* we requeue for retry because the error was retryable, and | |
1937 | * the request was not marked fast fail. Note that above, | |
1938 | * even if the request is marked fast fail, we still requeue | |
1939 | * for queue congestion conditions (QUEUE_FULL or BUSY) */ | |
8884efab | 1940 | if ((++scmd->retries) <= scmd->allowed |
4a27446f | 1941 | && !scsi_noretry_cmd(scmd)) { |
1da177e4 LT |
1942 | return NEEDS_RETRY; |
1943 | } else { | |
1944 | /* | |
1945 | * no more retries - report this one back to upper level. | |
1946 | */ | |
1947 | return SUCCESS; | |
1948 | } | |
1949 | } | |
1950 | ||
f078727b FT |
1951 | static void eh_lock_door_done(struct request *req, int uptodate) |
1952 | { | |
1953 | __blk_put_request(req->q, req); | |
1954 | } | |
1955 | ||
1da177e4 LT |
1956 | /** |
1957 | * scsi_eh_lock_door - Prevent medium removal for the specified device | |
1958 | * @sdev: SCSI device to prevent medium removal | |
1959 | * | |
1960 | * Locking: | |
91bc31fb | 1961 | * We must be called from process context. |
1da177e4 LT |
1962 | * |
1963 | * Notes: | |
1964 | * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the | |
1965 | * head of the devices request queue, and continue. | |
dc8875e1 | 1966 | */ |
1da177e4 LT |
1967 | static void scsi_eh_lock_door(struct scsi_device *sdev) |
1968 | { | |
f078727b | 1969 | struct request *req; |
1da177e4 | 1970 | |
91bc31fb JB |
1971 | /* |
1972 | * blk_get_request with GFP_KERNEL (__GFP_WAIT) sleeps until a | |
1973 | * request becomes available | |
1974 | */ | |
f078727b | 1975 | req = blk_get_request(sdev->request_queue, READ, GFP_KERNEL); |
a492f075 | 1976 | if (IS_ERR(req)) |
eb571eea | 1977 | return; |
1da177e4 | 1978 | |
f27b087b JA |
1979 | blk_rq_set_block_pc(req); |
1980 | ||
f078727b FT |
1981 | req->cmd[0] = ALLOW_MEDIUM_REMOVAL; |
1982 | req->cmd[1] = 0; | |
1983 | req->cmd[2] = 0; | |
1984 | req->cmd[3] = 0; | |
1985 | req->cmd[4] = SCSI_REMOVAL_PREVENT; | |
1986 | req->cmd[5] = 0; | |
1da177e4 | 1987 | |
f078727b FT |
1988 | req->cmd_len = COMMAND_SIZE(req->cmd[0]); |
1989 | ||
f078727b FT |
1990 | req->cmd_flags |= REQ_QUIET; |
1991 | req->timeout = 10 * HZ; | |
1992 | req->retries = 5; | |
1993 | ||
1994 | blk_execute_rq_nowait(req->q, NULL, req, 1, eh_lock_door_done); | |
1995 | } | |
1da177e4 LT |
1996 | |
1997 | /** | |
1998 | * scsi_restart_operations - restart io operations to the specified host. | |
1999 | * @shost: Host we are restarting. | |
2000 | * | |
2001 | * Notes: | |
2002 | * When we entered the error handler, we blocked all further i/o to | |
2003 | * this device. we need to 'reverse' this process. | |
dc8875e1 | 2004 | */ |
1da177e4 LT |
2005 | static void scsi_restart_operations(struct Scsi_Host *shost) |
2006 | { | |
2007 | struct scsi_device *sdev; | |
939647ee | 2008 | unsigned long flags; |
1da177e4 LT |
2009 | |
2010 | /* | |
2011 | * If the door was locked, we need to insert a door lock request | |
2012 | * onto the head of the SCSI request queue for the device. There | |
2013 | * is no point trying to lock the door of an off-line device. | |
2014 | */ | |
2015 | shost_for_each_device(sdev, shost) { | |
48379270 | 2016 | if (scsi_device_online(sdev) && sdev->was_reset && sdev->locked) { |
1da177e4 | 2017 | scsi_eh_lock_door(sdev); |
48379270 CH |
2018 | sdev->was_reset = 0; |
2019 | } | |
1da177e4 LT |
2020 | } |
2021 | ||
2022 | /* | |
2023 | * next free up anything directly waiting upon the host. this | |
2024 | * will be requests for character device operations, and also for | |
2025 | * ioctls to queued block devices. | |
2026 | */ | |
b4562022 | 2027 | SCSI_LOG_ERROR_RECOVERY(3, |
91921e01 | 2028 | shost_printk(KERN_INFO, shost, "waking up host to restart\n")); |
1da177e4 | 2029 | |
939647ee JB |
2030 | spin_lock_irqsave(shost->host_lock, flags); |
2031 | if (scsi_host_set_state(shost, SHOST_RUNNING)) | |
2032 | if (scsi_host_set_state(shost, SHOST_CANCEL)) | |
2033 | BUG_ON(scsi_host_set_state(shost, SHOST_DEL)); | |
2034 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
2035 | |
2036 | wake_up(&shost->host_wait); | |
2037 | ||
2038 | /* | |
2039 | * finally we need to re-initiate requests that may be pending. we will | |
2040 | * have had everything blocked while error handling is taking place, and | |
2041 | * now that error recovery is done, we will need to ensure that these | |
2042 | * requests are started. | |
2043 | */ | |
2044 | scsi_run_host_queues(shost); | |
57fc2e33 DW |
2045 | |
2046 | /* | |
2047 | * if eh is active and host_eh_scheduled is pending we need to re-run | |
2048 | * recovery. we do this check after scsi_run_host_queues() to allow | |
2049 | * everything pent up since the last eh run a chance to make forward | |
2050 | * progress before we sync again. Either we'll immediately re-run | |
2051 | * recovery or scsi_device_unbusy() will wake us again when these | |
2052 | * pending commands complete. | |
2053 | */ | |
2054 | spin_lock_irqsave(shost->host_lock, flags); | |
2055 | if (shost->host_eh_scheduled) | |
2056 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) | |
2057 | WARN_ON(scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)); | |
2058 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
2059 | } |
2060 | ||
2061 | /** | |
2062 | * scsi_eh_ready_devs - check device ready state and recover if not. | |
74cf298f RD |
2063 | * @shost: host to be recovered. |
2064 | * @work_q: &list_head for pending commands. | |
eb44820c | 2065 | * @done_q: &list_head for processed commands. |
dc8875e1 | 2066 | */ |
dca84e46 DW |
2067 | void scsi_eh_ready_devs(struct Scsi_Host *shost, |
2068 | struct list_head *work_q, | |
2069 | struct list_head *done_q) | |
1da177e4 LT |
2070 | { |
2071 | if (!scsi_eh_stu(shost, work_q, done_q)) | |
2072 | if (!scsi_eh_bus_device_reset(shost, work_q, done_q)) | |
30bd7df8 MC |
2073 | if (!scsi_eh_target_reset(shost, work_q, done_q)) |
2074 | if (!scsi_eh_bus_reset(shost, work_q, done_q)) | |
91921e01 | 2075 | if (!scsi_eh_host_reset(shost, work_q, done_q)) |
30bd7df8 MC |
2076 | scsi_eh_offline_sdevs(work_q, |
2077 | done_q); | |
1da177e4 | 2078 | } |
dca84e46 | 2079 | EXPORT_SYMBOL_GPL(scsi_eh_ready_devs); |
1da177e4 LT |
2080 | |
2081 | /** | |
2082 | * scsi_eh_flush_done_q - finish processed commands or retry them. | |
2083 | * @done_q: list_head of processed commands. | |
dc8875e1 | 2084 | */ |
041c5fc3 | 2085 | void scsi_eh_flush_done_q(struct list_head *done_q) |
1da177e4 | 2086 | { |
937abeaa | 2087 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 2088 | |
937abeaa CH |
2089 | list_for_each_entry_safe(scmd, next, done_q, eh_entry) { |
2090 | list_del_init(&scmd->eh_entry); | |
1da177e4 | 2091 | if (scsi_device_online(scmd->device) && |
4a27446f | 2092 | !scsi_noretry_cmd(scmd) && |
8884efab | 2093 | (++scmd->retries <= scmd->allowed)) { |
91921e01 HR |
2094 | SCSI_LOG_ERROR_RECOVERY(3, |
2095 | scmd_printk(KERN_INFO, scmd, | |
2096 | "%s: flush retry cmd: %p\n", | |
2097 | current->comm, scmd)); | |
1da177e4 LT |
2098 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); |
2099 | } else { | |
793698ce PM |
2100 | /* |
2101 | * If just we got sense for the device (called | |
2102 | * scsi_eh_get_sense), scmd->result is already | |
2103 | * set, do not set DRIVER_TIMEOUT. | |
2104 | */ | |
1da177e4 LT |
2105 | if (!scmd->result) |
2106 | scmd->result |= (DRIVER_TIMEOUT << 24); | |
91921e01 HR |
2107 | SCSI_LOG_ERROR_RECOVERY(3, |
2108 | scmd_printk(KERN_INFO, scmd, | |
2109 | "%s: flush finish cmd: %p\n", | |
2110 | current->comm, scmd)); | |
1da177e4 LT |
2111 | scsi_finish_command(scmd); |
2112 | } | |
2113 | } | |
2114 | } | |
041c5fc3 | 2115 | EXPORT_SYMBOL(scsi_eh_flush_done_q); |
1da177e4 LT |
2116 | |
2117 | /** | |
2118 | * scsi_unjam_host - Attempt to fix a host which has a cmd that failed. | |
2119 | * @shost: Host to unjam. | |
2120 | * | |
2121 | * Notes: | |
2122 | * When we come in here, we *know* that all commands on the bus have | |
2123 | * either completed, failed or timed out. we also know that no further | |
2124 | * commands are being sent to the host, so things are relatively quiet | |
2125 | * and we have freedom to fiddle with things as we wish. | |
2126 | * | |
2127 | * This is only the *default* implementation. it is possible for | |
2128 | * individual drivers to supply their own version of this function, and | |
2129 | * if the maintainer wishes to do this, it is strongly suggested that | |
2130 | * this function be taken as a template and modified. this function | |
2131 | * was designed to correctly handle problems for about 95% of the | |
2132 | * different cases out there, and it should always provide at least a | |
2133 | * reasonable amount of error recovery. | |
2134 | * | |
2135 | * Any command marked 'failed' or 'timeout' must eventually have | |
2136 | * scsi_finish_cmd() called for it. we do all of the retry stuff | |
2137 | * here, so when we restart the host after we return it should have an | |
2138 | * empty queue. | |
dc8875e1 | 2139 | */ |
1da177e4 LT |
2140 | static void scsi_unjam_host(struct Scsi_Host *shost) |
2141 | { | |
2142 | unsigned long flags; | |
2143 | LIST_HEAD(eh_work_q); | |
2144 | LIST_HEAD(eh_done_q); | |
2145 | ||
2146 | spin_lock_irqsave(shost->host_lock, flags); | |
2147 | list_splice_init(&shost->eh_cmd_q, &eh_work_q); | |
2148 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2149 | ||
2150 | SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost, &eh_work_q)); | |
2151 | ||
2152 | if (!scsi_eh_get_sense(&eh_work_q, &eh_done_q)) | |
2153 | if (!scsi_eh_abort_cmds(&eh_work_q, &eh_done_q)) | |
2154 | scsi_eh_ready_devs(shost, &eh_work_q, &eh_done_q); | |
2155 | ||
b4562022 | 2156 | spin_lock_irqsave(shost->host_lock, flags); |
bb3b621a | 2157 | if (shost->eh_deadline != -1) |
b4562022 HR |
2158 | shost->last_reset = 0; |
2159 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
2160 | scsi_eh_flush_done_q(&eh_done_q); |
2161 | } | |
2162 | ||
2163 | /** | |
ad42eb1b | 2164 | * scsi_error_handler - SCSI error handler thread |
1da177e4 LT |
2165 | * @data: Host for which we are running. |
2166 | * | |
2167 | * Notes: | |
ad42eb1b CH |
2168 | * This is the main error handling loop. This is run as a kernel thread |
2169 | * for every SCSI host and handles all error handling activity. | |
dc8875e1 | 2170 | */ |
1da177e4 LT |
2171 | int scsi_error_handler(void *data) |
2172 | { | |
ad42eb1b | 2173 | struct Scsi_Host *shost = data; |
1da177e4 | 2174 | |
1da177e4 | 2175 | /* |
ad42eb1b CH |
2176 | * We use TASK_INTERRUPTIBLE so that the thread is not |
2177 | * counted against the load average as a running process. | |
2178 | * We never actually get interrupted because kthread_run | |
c03264a7 | 2179 | * disables signal delivery for the created thread. |
1da177e4 | 2180 | */ |
3ed7a470 | 2181 | while (!kthread_should_stop()) { |
b9d5c6b7 | 2182 | set_current_state(TASK_INTERRUPTIBLE); |
ee7863bc | 2183 | if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) || |
74665016 | 2184 | shost->host_failed != atomic_read(&shost->host_busy)) { |
ad42eb1b | 2185 | SCSI_LOG_ERROR_RECOVERY(1, |
91921e01 HR |
2186 | shost_printk(KERN_INFO, shost, |
2187 | "scsi_eh_%d: sleeping\n", | |
2188 | shost->host_no)); | |
3ed7a470 | 2189 | schedule(); |
3ed7a470 JB |
2190 | continue; |
2191 | } | |
1da177e4 | 2192 | |
3ed7a470 | 2193 | __set_current_state(TASK_RUNNING); |
ad42eb1b | 2194 | SCSI_LOG_ERROR_RECOVERY(1, |
91921e01 HR |
2195 | shost_printk(KERN_INFO, shost, |
2196 | "scsi_eh_%d: waking up %d/%d/%d\n", | |
2197 | shost->host_no, shost->host_eh_scheduled, | |
74665016 CH |
2198 | shost->host_failed, |
2199 | atomic_read(&shost->host_busy))); | |
1da177e4 | 2200 | |
1da177e4 LT |
2201 | /* |
2202 | * We have a host that is failing for some reason. Figure out | |
2203 | * what we need to do to get it up and online again (if we can). | |
2204 | * If we fail, we end up taking the thing offline. | |
2205 | */ | |
ae0751ff | 2206 | if (!shost->eh_noresume && scsi_autopm_get_host(shost) != 0) { |
bc4f2401 | 2207 | SCSI_LOG_ERROR_RECOVERY(1, |
a222b1e2 HR |
2208 | shost_printk(KERN_ERR, shost, |
2209 | "scsi_eh_%d: unable to autoresume\n", | |
2210 | shost->host_no)); | |
bc4f2401 AS |
2211 | continue; |
2212 | } | |
2213 | ||
9227c33d CH |
2214 | if (shost->transportt->eh_strategy_handler) |
2215 | shost->transportt->eh_strategy_handler(shost); | |
1da177e4 LT |
2216 | else |
2217 | scsi_unjam_host(shost); | |
2218 | ||
1da177e4 LT |
2219 | /* |
2220 | * Note - if the above fails completely, the action is to take | |
2221 | * individual devices offline and flush the queue of any | |
2222 | * outstanding requests that may have been pending. When we | |
2223 | * restart, we restart any I/O to any other devices on the bus | |
2224 | * which are still online. | |
2225 | */ | |
2226 | scsi_restart_operations(shost); | |
ae0751ff LM |
2227 | if (!shost->eh_noresume) |
2228 | scsi_autopm_put_host(shost); | |
1da177e4 | 2229 | } |
461a0ffb SR |
2230 | __set_current_state(TASK_RUNNING); |
2231 | ||
ad42eb1b | 2232 | SCSI_LOG_ERROR_RECOVERY(1, |
91921e01 HR |
2233 | shost_printk(KERN_INFO, shost, |
2234 | "Error handler scsi_eh_%d exiting\n", | |
2235 | shost->host_no)); | |
3ed7a470 | 2236 | shost->ehandler = NULL; |
1da177e4 LT |
2237 | return 0; |
2238 | } | |
2239 | ||
2240 | /* | |
2241 | * Function: scsi_report_bus_reset() | |
2242 | * | |
2243 | * Purpose: Utility function used by low-level drivers to report that | |
2244 | * they have observed a bus reset on the bus being handled. | |
2245 | * | |
2246 | * Arguments: shost - Host in question | |
2247 | * channel - channel on which reset was observed. | |
2248 | * | |
2249 | * Returns: Nothing | |
2250 | * | |
2251 | * Lock status: Host lock must be held. | |
2252 | * | |
2253 | * Notes: This only needs to be called if the reset is one which | |
2254 | * originates from an unknown location. Resets originated | |
2255 | * by the mid-level itself don't need to call this, but there | |
2256 | * should be no harm. | |
2257 | * | |
2258 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
2259 | * is properly treated. | |
2260 | */ | |
2261 | void scsi_report_bus_reset(struct Scsi_Host *shost, int channel) | |
2262 | { | |
2263 | struct scsi_device *sdev; | |
2264 | ||
2265 | __shost_for_each_device(sdev, shost) { | |
30bd7df8 MC |
2266 | if (channel == sdev_channel(sdev)) |
2267 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
2268 | } |
2269 | } | |
2270 | EXPORT_SYMBOL(scsi_report_bus_reset); | |
2271 | ||
2272 | /* | |
2273 | * Function: scsi_report_device_reset() | |
2274 | * | |
2275 | * Purpose: Utility function used by low-level drivers to report that | |
2276 | * they have observed a device reset on the device being handled. | |
2277 | * | |
2278 | * Arguments: shost - Host in question | |
2279 | * channel - channel on which reset was observed | |
2280 | * target - target on which reset was observed | |
2281 | * | |
2282 | * Returns: Nothing | |
2283 | * | |
2284 | * Lock status: Host lock must be held | |
2285 | * | |
2286 | * Notes: This only needs to be called if the reset is one which | |
2287 | * originates from an unknown location. Resets originated | |
2288 | * by the mid-level itself don't need to call this, but there | |
2289 | * should be no harm. | |
2290 | * | |
2291 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
2292 | * is properly treated. | |
2293 | */ | |
2294 | void scsi_report_device_reset(struct Scsi_Host *shost, int channel, int target) | |
2295 | { | |
2296 | struct scsi_device *sdev; | |
2297 | ||
2298 | __shost_for_each_device(sdev, shost) { | |
422c0d61 | 2299 | if (channel == sdev_channel(sdev) && |
30bd7df8 MC |
2300 | target == sdev_id(sdev)) |
2301 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
2302 | } |
2303 | } | |
2304 | EXPORT_SYMBOL(scsi_report_device_reset); | |
2305 | ||
2306 | static void | |
2307 | scsi_reset_provider_done_command(struct scsi_cmnd *scmd) | |
2308 | { | |
2309 | } | |
2310 | ||
176aa9d6 CH |
2311 | /** |
2312 | * scsi_ioctl_reset: explicitly reset a host/bus/target/device | |
2313 | * @dev: scsi_device to operate on | |
2314 | * @arg: reset type (see sg.h) | |
1da177e4 LT |
2315 | */ |
2316 | int | |
176aa9d6 | 2317 | scsi_ioctl_reset(struct scsi_device *dev, int __user *arg) |
1da177e4 | 2318 | { |
bc4f2401 | 2319 | struct scsi_cmnd *scmd; |
d7a1bb0a | 2320 | struct Scsi_Host *shost = dev->host; |
1da177e4 | 2321 | struct request req; |
d7a1bb0a | 2322 | unsigned long flags; |
176aa9d6 CH |
2323 | int error = 0, rtn, val; |
2324 | ||
2325 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2326 | return -EACCES; | |
2327 | ||
2328 | error = get_user(val, arg); | |
2329 | if (error) | |
2330 | return error; | |
1da177e4 | 2331 | |
bc4f2401 | 2332 | if (scsi_autopm_get_host(shost) < 0) |
176aa9d6 | 2333 | return -EIO; |
bc4f2401 | 2334 | |
176aa9d6 | 2335 | error = -EIO; |
bc4f2401 | 2336 | scmd = scsi_get_command(dev, GFP_KERNEL); |
0f121dd8 | 2337 | if (!scmd) |
95eeb5f5 | 2338 | goto out_put_autopm_host; |
95eeb5f5 | 2339 | |
4f54eec8 | 2340 | blk_rq_init(NULL, &req); |
1da177e4 | 2341 | scmd->request = &req; |
b4edcbca | 2342 | |
64a87b24 BH |
2343 | scmd->cmnd = req.cmd; |
2344 | ||
1da177e4 | 2345 | scmd->scsi_done = scsi_reset_provider_done_command; |
30b0c37b | 2346 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
1da177e4 LT |
2347 | |
2348 | scmd->cmd_len = 0; | |
2349 | ||
2350 | scmd->sc_data_direction = DMA_BIDIRECTIONAL; | |
1da177e4 | 2351 | |
d7a1bb0a JS |
2352 | spin_lock_irqsave(shost->host_lock, flags); |
2353 | shost->tmf_in_progress = 1; | |
2354 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2355 | ||
176aa9d6 CH |
2356 | switch (val & ~SG_SCSI_RESET_NO_ESCALATE) { |
2357 | case SG_SCSI_RESET_NOTHING: | |
2358 | rtn = SUCCESS; | |
2359 | break; | |
2360 | case SG_SCSI_RESET_DEVICE: | |
1da177e4 | 2361 | rtn = scsi_try_bus_device_reset(scmd); |
176aa9d6 | 2362 | if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE)) |
1da177e4 LT |
2363 | break; |
2364 | /* FALLTHROUGH */ | |
176aa9d6 | 2365 | case SG_SCSI_RESET_TARGET: |
30bd7df8 | 2366 | rtn = scsi_try_target_reset(scmd); |
176aa9d6 | 2367 | if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE)) |
30bd7df8 MC |
2368 | break; |
2369 | /* FALLTHROUGH */ | |
176aa9d6 | 2370 | case SG_SCSI_RESET_BUS: |
1da177e4 | 2371 | rtn = scsi_try_bus_reset(scmd); |
176aa9d6 | 2372 | if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE)) |
1da177e4 LT |
2373 | break; |
2374 | /* FALLTHROUGH */ | |
176aa9d6 | 2375 | case SG_SCSI_RESET_HOST: |
1da177e4 | 2376 | rtn = scsi_try_host_reset(scmd); |
176aa9d6 CH |
2377 | if (rtn == SUCCESS) |
2378 | break; | |
1da177e4 | 2379 | default: |
176aa9d6 | 2380 | /* FALLTHROUGH */ |
1da177e4 | 2381 | rtn = FAILED; |
176aa9d6 | 2382 | break; |
1da177e4 LT |
2383 | } |
2384 | ||
176aa9d6 CH |
2385 | error = (rtn == SUCCESS) ? 0 : -EIO; |
2386 | ||
d7a1bb0a JS |
2387 | spin_lock_irqsave(shost->host_lock, flags); |
2388 | shost->tmf_in_progress = 0; | |
2389 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2390 | ||
2391 | /* | |
2392 | * be sure to wake up anyone who was sleeping or had their queue | |
2393 | * suspended while we performed the TMF. | |
2394 | */ | |
2395 | SCSI_LOG_ERROR_RECOVERY(3, | |
91921e01 HR |
2396 | shost_printk(KERN_INFO, shost, |
2397 | "waking up host to restart after TMF\n")); | |
d7a1bb0a JS |
2398 | |
2399 | wake_up(&shost->host_wait); | |
d7a1bb0a JS |
2400 | scsi_run_host_queues(shost); |
2401 | ||
0f121dd8 CH |
2402 | scsi_put_command(scmd); |
2403 | ||
04796336 | 2404 | out_put_autopm_host: |
bc4f2401 | 2405 | scsi_autopm_put_host(shost); |
176aa9d6 | 2406 | return error; |
1da177e4 | 2407 | } |
176aa9d6 | 2408 | EXPORT_SYMBOL(scsi_ioctl_reset); |
1da177e4 LT |
2409 | |
2410 | /** | |
2411 | * scsi_normalize_sense - normalize main elements from either fixed or | |
2412 | * descriptor sense data format into a common format. | |
2413 | * | |
2414 | * @sense_buffer: byte array containing sense data returned by device | |
2415 | * @sb_len: number of valid bytes in sense_buffer | |
2416 | * @sshdr: pointer to instance of structure that common | |
2417 | * elements are written to. | |
2418 | * | |
2419 | * Notes: | |
2420 | * The "main elements" from sense data are: response_code, sense_key, | |
2421 | * asc, ascq and additional_length (only for descriptor format). | |
2422 | * | |
2423 | * Typically this function can be called after a device has | |
2424 | * responded to a SCSI command with the CHECK_CONDITION status. | |
2425 | * | |
2426 | * Return value: | |
4753cbc0 | 2427 | * true if valid sense data information found, else false; |
dc8875e1 | 2428 | */ |
4753cbc0 HR |
2429 | bool scsi_normalize_sense(const u8 *sense_buffer, int sb_len, |
2430 | struct scsi_sense_hdr *sshdr) | |
1da177e4 | 2431 | { |
33aa687d | 2432 | if (!sense_buffer || !sb_len) |
4753cbc0 | 2433 | return false; |
1da177e4 LT |
2434 | |
2435 | memset(sshdr, 0, sizeof(struct scsi_sense_hdr)); | |
2436 | ||
2437 | sshdr->response_code = (sense_buffer[0] & 0x7f); | |
33aa687d JB |
2438 | |
2439 | if (!scsi_sense_valid(sshdr)) | |
4753cbc0 | 2440 | return false; |
33aa687d | 2441 | |
1da177e4 LT |
2442 | if (sshdr->response_code >= 0x72) { |
2443 | /* | |
2444 | * descriptor format | |
2445 | */ | |
2446 | if (sb_len > 1) | |
2447 | sshdr->sense_key = (sense_buffer[1] & 0xf); | |
2448 | if (sb_len > 2) | |
2449 | sshdr->asc = sense_buffer[2]; | |
2450 | if (sb_len > 3) | |
2451 | sshdr->ascq = sense_buffer[3]; | |
2452 | if (sb_len > 7) | |
2453 | sshdr->additional_length = sense_buffer[7]; | |
2454 | } else { | |
0bf8c869 | 2455 | /* |
1da177e4 LT |
2456 | * fixed format |
2457 | */ | |
2458 | if (sb_len > 2) | |
2459 | sshdr->sense_key = (sense_buffer[2] & 0xf); | |
2460 | if (sb_len > 7) { | |
2461 | sb_len = (sb_len < (sense_buffer[7] + 8)) ? | |
2462 | sb_len : (sense_buffer[7] + 8); | |
2463 | if (sb_len > 12) | |
2464 | sshdr->asc = sense_buffer[12]; | |
2465 | if (sb_len > 13) | |
2466 | sshdr->ascq = sense_buffer[13]; | |
2467 | } | |
2468 | } | |
2469 | ||
4753cbc0 | 2470 | return true; |
1da177e4 LT |
2471 | } |
2472 | EXPORT_SYMBOL(scsi_normalize_sense); | |
2473 | ||
4753cbc0 HR |
2474 | bool scsi_command_normalize_sense(const struct scsi_cmnd *cmd, |
2475 | struct scsi_sense_hdr *sshdr) | |
1da177e4 LT |
2476 | { |
2477 | return scsi_normalize_sense(cmd->sense_buffer, | |
b80ca4f7 | 2478 | SCSI_SENSE_BUFFERSIZE, sshdr); |
1da177e4 LT |
2479 | } |
2480 | EXPORT_SYMBOL(scsi_command_normalize_sense); | |
2481 | ||
2482 | /** | |
eb44820c | 2483 | * scsi_sense_desc_find - search for a given descriptor type in descriptor sense data format. |
1da177e4 LT |
2484 | * @sense_buffer: byte array of descriptor format sense data |
2485 | * @sb_len: number of valid bytes in sense_buffer | |
2486 | * @desc_type: value of descriptor type to find | |
2487 | * (e.g. 0 -> information) | |
2488 | * | |
2489 | * Notes: | |
2490 | * only valid when sense data is in descriptor format | |
2491 | * | |
2492 | * Return value: | |
2493 | * pointer to start of (first) descriptor if found else NULL | |
dc8875e1 | 2494 | */ |
1da177e4 LT |
2495 | const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len, |
2496 | int desc_type) | |
2497 | { | |
2498 | int add_sen_len, add_len, desc_len, k; | |
2499 | const u8 * descp; | |
2500 | ||
2501 | if ((sb_len < 8) || (0 == (add_sen_len = sense_buffer[7]))) | |
2502 | return NULL; | |
2503 | if ((sense_buffer[0] < 0x72) || (sense_buffer[0] > 0x73)) | |
2504 | return NULL; | |
2505 | add_sen_len = (add_sen_len < (sb_len - 8)) ? | |
2506 | add_sen_len : (sb_len - 8); | |
2507 | descp = &sense_buffer[8]; | |
2508 | for (desc_len = 0, k = 0; k < add_sen_len; k += desc_len) { | |
2509 | descp += desc_len; | |
2510 | add_len = (k < (add_sen_len - 1)) ? descp[1]: -1; | |
2511 | desc_len = add_len + 2; | |
2512 | if (descp[0] == desc_type) | |
2513 | return descp; | |
2514 | if (add_len < 0) // short descriptor ?? | |
2515 | break; | |
2516 | } | |
2517 | return NULL; | |
2518 | } | |
2519 | EXPORT_SYMBOL(scsi_sense_desc_find); | |
2520 | ||
2521 | /** | |
eb44820c | 2522 | * scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor format) |
1da177e4 LT |
2523 | * @sense_buffer: byte array of sense data |
2524 | * @sb_len: number of valid bytes in sense_buffer | |
2525 | * @info_out: pointer to 64 integer where 8 or 4 byte information | |
2526 | * field will be placed if found. | |
2527 | * | |
2528 | * Return value: | |
2529 | * 1 if information field found, 0 if not found. | |
dc8875e1 | 2530 | */ |
1da177e4 LT |
2531 | int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len, |
2532 | u64 * info_out) | |
2533 | { | |
2534 | int j; | |
2535 | const u8 * ucp; | |
2536 | u64 ull; | |
2537 | ||
2538 | if (sb_len < 7) | |
2539 | return 0; | |
2540 | switch (sense_buffer[0] & 0x7f) { | |
2541 | case 0x70: | |
2542 | case 0x71: | |
2543 | if (sense_buffer[0] & 0x80) { | |
2544 | *info_out = (sense_buffer[3] << 24) + | |
2545 | (sense_buffer[4] << 16) + | |
2546 | (sense_buffer[5] << 8) + sense_buffer[6]; | |
2547 | return 1; | |
2548 | } else | |
2549 | return 0; | |
2550 | case 0x72: | |
2551 | case 0x73: | |
2552 | ucp = scsi_sense_desc_find(sense_buffer, sb_len, | |
2553 | 0 /* info desc */); | |
2554 | if (ucp && (0xa == ucp[1])) { | |
2555 | ull = 0; | |
2556 | for (j = 0; j < 8; ++j) { | |
2557 | if (j > 0) | |
2558 | ull <<= 8; | |
2559 | ull |= ucp[4 + j]; | |
2560 | } | |
2561 | *info_out = ull; | |
2562 | return 1; | |
2563 | } else | |
2564 | return 0; | |
2565 | default: | |
2566 | return 0; | |
2567 | } | |
2568 | } | |
2569 | EXPORT_SYMBOL(scsi_get_sense_info_fld); | |
3bc6a261 FT |
2570 | |
2571 | /** | |
2572 | * scsi_build_sense_buffer - build sense data in a buffer | |
2573 | * @desc: Sense format (non zero == descriptor format, | |
2574 | * 0 == fixed format) | |
2575 | * @buf: Where to build sense data | |
2576 | * @key: Sense key | |
2577 | * @asc: Additional sense code | |
2578 | * @ascq: Additional sense code qualifier | |
2579 | * | |
2580 | **/ | |
2581 | void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq) | |
2582 | { | |
2583 | if (desc) { | |
2584 | buf[0] = 0x72; /* descriptor, current */ | |
2585 | buf[1] = key; | |
2586 | buf[2] = asc; | |
2587 | buf[3] = ascq; | |
2588 | buf[7] = 0; | |
2589 | } else { | |
2590 | buf[0] = 0x70; /* fixed, current */ | |
2591 | buf[2] = key; | |
2592 | buf[7] = 0xa; | |
2593 | buf[12] = asc; | |
2594 | buf[13] = ascq; | |
2595 | } | |
2596 | } | |
2597 | EXPORT_SYMBOL(scsi_build_sense_buffer); |