Commit | Line | Data |
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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> |
a1524f22 | 29 | #include <asm/unaligned.h> |
1da177e4 LT |
30 | |
31 | #include <scsi/scsi.h> | |
beb40487 | 32 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
33 | #include <scsi/scsi_dbg.h> |
34 | #include <scsi/scsi_device.h> | |
18a4d0a2 | 35 | #include <scsi/scsi_driver.h> |
1da177e4 | 36 | #include <scsi/scsi_eh.h> |
c829c394 | 37 | #include <scsi/scsi_transport.h> |
1da177e4 LT |
38 | #include <scsi/scsi_host.h> |
39 | #include <scsi/scsi_ioctl.h> | |
176aa9d6 | 40 | #include <scsi/sg.h> |
1da177e4 LT |
41 | |
42 | #include "scsi_priv.h" | |
43 | #include "scsi_logging.h" | |
79ee8304 | 44 | #include "scsi_transport_api.h" |
1da177e4 | 45 | |
bf816235 KT |
46 | #include <trace/events/scsi.h> |
47 | ||
14216561 JB |
48 | static void scsi_eh_done(struct scsi_cmnd *scmd); |
49 | ||
1da177e4 LT |
50 | /* |
51 | * These should *probably* be handled by the host itself. | |
52 | * Since it is allowed to sleep, it probably should. | |
53 | */ | |
54 | #define BUS_RESET_SETTLE_TIME (10) | |
55 | #define HOST_RESET_SETTLE_TIME (10) | |
56 | ||
3eef6257 | 57 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd); |
e494f6a7 HR |
58 | static int scsi_try_to_abort_cmd(struct scsi_host_template *, |
59 | struct scsi_cmnd *); | |
3eef6257 | 60 | |
1da177e4 LT |
61 | /* called with shost->host_lock held */ |
62 | void scsi_eh_wakeup(struct Scsi_Host *shost) | |
63 | { | |
74665016 | 64 | if (atomic_read(&shost->host_busy) == shost->host_failed) { |
bf816235 | 65 | trace_scsi_eh_wakeup(shost); |
3ed7a470 | 66 | wake_up_process(shost->ehandler); |
91921e01 HR |
67 | SCSI_LOG_ERROR_RECOVERY(5, shost_printk(KERN_INFO, shost, |
68 | "Waking error handler thread\n")); | |
1da177e4 LT |
69 | } |
70 | } | |
f8bbfc24 TH |
71 | |
72 | /** | |
73 | * scsi_schedule_eh - schedule EH for SCSI host | |
74 | * @shost: SCSI host to invoke error handling on. | |
75 | * | |
76 | * Schedule SCSI EH without scmd. | |
dc8875e1 | 77 | */ |
f8bbfc24 TH |
78 | void scsi_schedule_eh(struct Scsi_Host *shost) |
79 | { | |
80 | unsigned long flags; | |
81 | ||
82 | spin_lock_irqsave(shost->host_lock, flags); | |
83 | ||
84 | if (scsi_host_set_state(shost, SHOST_RECOVERY) == 0 || | |
85 | scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY) == 0) { | |
86 | shost->host_eh_scheduled++; | |
87 | scsi_eh_wakeup(shost); | |
88 | } | |
89 | ||
90 | spin_unlock_irqrestore(shost->host_lock, flags); | |
91 | } | |
92 | EXPORT_SYMBOL_GPL(scsi_schedule_eh); | |
1da177e4 | 93 | |
b4562022 HR |
94 | static int scsi_host_eh_past_deadline(struct Scsi_Host *shost) |
95 | { | |
bb3b621a | 96 | if (!shost->last_reset || shost->eh_deadline == -1) |
b4562022 HR |
97 | return 0; |
98 | ||
76ad3e59 HR |
99 | /* |
100 | * 32bit accesses are guaranteed to be atomic | |
101 | * (on all supported architectures), so instead | |
102 | * of using a spinlock we can as well double check | |
bb3b621a | 103 | * if eh_deadline has been set to 'off' during the |
76ad3e59 HR |
104 | * time_before call. |
105 | */ | |
106 | if (time_before(jiffies, shost->last_reset + shost->eh_deadline) && | |
bb3b621a | 107 | shost->eh_deadline > -1) |
b4562022 HR |
108 | return 0; |
109 | ||
110 | return 1; | |
111 | } | |
112 | ||
e494f6a7 HR |
113 | /** |
114 | * scmd_eh_abort_handler - Handle command aborts | |
115 | * @work: command to be aborted. | |
116 | */ | |
117 | void | |
118 | scmd_eh_abort_handler(struct work_struct *work) | |
119 | { | |
120 | struct scsi_cmnd *scmd = | |
121 | container_of(work, struct scsi_cmnd, abort_work.work); | |
122 | struct scsi_device *sdev = scmd->device; | |
e494f6a7 HR |
123 | int rtn; |
124 | ||
e494f6a7 | 125 | if (scsi_host_eh_past_deadline(sdev->host)) { |
e494f6a7 HR |
126 | SCSI_LOG_ERROR_RECOVERY(3, |
127 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 128 | "eh timeout, not aborting\n")); |
e494f6a7 | 129 | } else { |
e494f6a7 HR |
130 | SCSI_LOG_ERROR_RECOVERY(3, |
131 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 132 | "aborting command\n")); |
e494f6a7 HR |
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, | |
470613b4 HR |
139 | "eh timeout, not retrying " |
140 | "aborted command\n")); | |
bb3b621a | 141 | } else if (!scsi_noretry_cmd(scmd) && |
e494f6a7 HR |
142 | (++scmd->retries <= scmd->allowed)) { |
143 | SCSI_LOG_ERROR_RECOVERY(3, | |
144 | scmd_printk(KERN_WARNING, scmd, | |
470613b4 | 145 | "retry aborted command\n")); |
e494f6a7 | 146 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); |
bb3b621a | 147 | return; |
e494f6a7 HR |
148 | } else { |
149 | SCSI_LOG_ERROR_RECOVERY(3, | |
150 | scmd_printk(KERN_WARNING, scmd, | |
470613b4 | 151 | "finish aborted command\n")); |
e494f6a7 | 152 | scsi_finish_command(scmd); |
bb3b621a | 153 | return; |
e494f6a7 | 154 | } |
bb3b621a RM |
155 | } else { |
156 | SCSI_LOG_ERROR_RECOVERY(3, | |
157 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 158 | "cmd abort %s\n", |
883a030f HR |
159 | (rtn == FAST_IO_FAIL) ? |
160 | "not send" : "failed")); | |
e494f6a7 | 161 | } |
e494f6a7 HR |
162 | } |
163 | ||
164 | if (!scsi_eh_scmd_add(scmd, 0)) { | |
165 | SCSI_LOG_ERROR_RECOVERY(3, | |
166 | scmd_printk(KERN_WARNING, scmd, | |
470613b4 | 167 | "terminate aborted command\n")); |
8922a908 | 168 | set_host_byte(scmd, DID_TIME_OUT); |
e494f6a7 HR |
169 | scsi_finish_command(scmd); |
170 | } | |
171 | } | |
172 | ||
173 | /** | |
174 | * scsi_abort_command - schedule a command abort | |
175 | * @scmd: scmd to abort. | |
176 | * | |
177 | * We only need to abort commands after a command timeout | |
178 | */ | |
179 | static int | |
180 | scsi_abort_command(struct scsi_cmnd *scmd) | |
181 | { | |
182 | struct scsi_device *sdev = scmd->device; | |
183 | struct Scsi_Host *shost = sdev->host; | |
184 | unsigned long flags; | |
185 | ||
186 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) { | |
187 | /* | |
188 | * Retry after abort failed, escalate to next level. | |
189 | */ | |
7daf4804 | 190 | scmd->eh_eflags &= ~SCSI_EH_ABORT_SCHEDULED; |
e494f6a7 HR |
191 | SCSI_LOG_ERROR_RECOVERY(3, |
192 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 193 | "previous abort failed\n")); |
fcc95a76 | 194 | BUG_ON(delayed_work_pending(&scmd->abort_work)); |
e494f6a7 HR |
195 | return FAILED; |
196 | } | |
197 | ||
198 | /* | |
199 | * Do not try a command abort if | |
200 | * SCSI EH has already started. | |
201 | */ | |
202 | spin_lock_irqsave(shost->host_lock, flags); | |
203 | if (scsi_host_in_recovery(shost)) { | |
204 | spin_unlock_irqrestore(shost->host_lock, flags); | |
205 | SCSI_LOG_ERROR_RECOVERY(3, | |
206 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 207 | "not aborting, host in recovery\n")); |
e494f6a7 HR |
208 | return FAILED; |
209 | } | |
210 | ||
bb3b621a | 211 | if (shost->eh_deadline != -1 && !shost->last_reset) |
e494f6a7 HR |
212 | shost->last_reset = jiffies; |
213 | spin_unlock_irqrestore(shost->host_lock, flags); | |
214 | ||
215 | scmd->eh_eflags |= SCSI_EH_ABORT_SCHEDULED; | |
216 | SCSI_LOG_ERROR_RECOVERY(3, | |
470613b4 | 217 | scmd_printk(KERN_INFO, scmd, "abort scheduled\n")); |
e494f6a7 HR |
218 | queue_delayed_work(shost->tmf_work_q, &scmd->abort_work, HZ / 100); |
219 | return SUCCESS; | |
220 | } | |
221 | ||
1da177e4 LT |
222 | /** |
223 | * scsi_eh_scmd_add - add scsi cmd to error handling. | |
224 | * @scmd: scmd to run eh on. | |
225 | * @eh_flag: optional SCSI_EH flag. | |
226 | * | |
227 | * Return value: | |
228 | * 0 on failure. | |
dc8875e1 | 229 | */ |
1da177e4 LT |
230 | int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag) |
231 | { | |
232 | struct Scsi_Host *shost = scmd->device->host; | |
233 | unsigned long flags; | |
939647ee | 234 | int ret = 0; |
1da177e4 | 235 | |
3ed7a470 | 236 | if (!shost->ehandler) |
1da177e4 LT |
237 | return 0; |
238 | ||
239 | spin_lock_irqsave(shost->host_lock, flags); | |
939647ee JB |
240 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) |
241 | if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) | |
242 | goto out_unlock; | |
1da177e4 | 243 | |
bb3b621a | 244 | if (shost->eh_deadline != -1 && !shost->last_reset) |
b4562022 HR |
245 | shost->last_reset = jiffies; |
246 | ||
939647ee | 247 | ret = 1; |
e494f6a7 HR |
248 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) |
249 | eh_flag &= ~SCSI_EH_CANCEL_CMD; | |
3111b0d1 | 250 | scmd->eh_eflags |= eh_flag; |
1da177e4 | 251 | list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q); |
1da177e4 LT |
252 | shost->host_failed++; |
253 | scsi_eh_wakeup(shost); | |
939647ee | 254 | out_unlock: |
1da177e4 | 255 | spin_unlock_irqrestore(shost->host_lock, flags); |
939647ee | 256 | return ret; |
1da177e4 LT |
257 | } |
258 | ||
1da177e4 LT |
259 | /** |
260 | * scsi_times_out - Timeout function for normal scsi commands. | |
242f9dcb | 261 | * @req: request that is timing out. |
1da177e4 LT |
262 | * |
263 | * Notes: | |
264 | * We do not need to lock this. There is the potential for a race | |
265 | * only in that the normal completion handling might run, but if the | |
266 | * normal completion function determines that the timer has already | |
267 | * fired, then it mustn't do anything. | |
dc8875e1 | 268 | */ |
242f9dcb | 269 | enum blk_eh_timer_return scsi_times_out(struct request *req) |
1da177e4 | 270 | { |
242f9dcb | 271 | struct scsi_cmnd *scmd = req->special; |
242f9dcb | 272 | enum blk_eh_timer_return rtn = BLK_EH_NOT_HANDLED; |
0bf8c869 | 273 | struct Scsi_Host *host = scmd->device->host; |
6c5f8ce1 | 274 | |
bf816235 | 275 | trace_scsi_dispatch_cmd_timeout(scmd); |
1da177e4 LT |
276 | scsi_log_completion(scmd, TIMEOUT_ERROR); |
277 | ||
bb3b621a | 278 | if (host->eh_deadline != -1 && !host->last_reset) |
b4562022 HR |
279 | host->last_reset = jiffies; |
280 | ||
0bf8c869 JJ |
281 | if (host->transportt->eh_timed_out) |
282 | rtn = host->transportt->eh_timed_out(scmd); | |
283 | else if (host->hostt->eh_timed_out) | |
284 | rtn = host->hostt->eh_timed_out(scmd); | |
1da177e4 | 285 | |
a33c070b HR |
286 | if (rtn == BLK_EH_NOT_HANDLED) { |
287 | if (!host->hostt->no_async_abort && | |
288 | scsi_abort_command(scmd) == SUCCESS) | |
e494f6a7 HR |
289 | return BLK_EH_NOT_HANDLED; |
290 | ||
a33c070b HR |
291 | set_host_byte(scmd, DID_TIME_OUT); |
292 | if (!scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD)) | |
293 | rtn = BLK_EH_HANDLED; | |
294 | } | |
242f9dcb | 295 | |
fa990781 | 296 | return rtn; |
1da177e4 LT |
297 | } |
298 | ||
299 | /** | |
300 | * scsi_block_when_processing_errors - Prevent cmds from being queued. | |
301 | * @sdev: Device on which we are performing recovery. | |
302 | * | |
303 | * Description: | |
304 | * We block until the host is out of error recovery, and then check to | |
305 | * see whether the host or the device is offline. | |
306 | * | |
307 | * Return value: | |
308 | * 0 when dev was taken offline by error recovery. 1 OK to proceed. | |
dc8875e1 | 309 | */ |
1da177e4 LT |
310 | int scsi_block_when_processing_errors(struct scsi_device *sdev) |
311 | { | |
312 | int online; | |
313 | ||
939647ee | 314 | wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host)); |
1da177e4 LT |
315 | |
316 | online = scsi_device_online(sdev); | |
317 | ||
91921e01 HR |
318 | SCSI_LOG_ERROR_RECOVERY(5, sdev_printk(KERN_INFO, sdev, |
319 | "%s: rtn: %d\n", __func__, online)); | |
1da177e4 LT |
320 | |
321 | return online; | |
322 | } | |
323 | EXPORT_SYMBOL(scsi_block_when_processing_errors); | |
324 | ||
325 | #ifdef CONFIG_SCSI_LOGGING | |
326 | /** | |
327 | * scsi_eh_prt_fail_stats - Log info on failures. | |
328 | * @shost: scsi host being recovered. | |
329 | * @work_q: Queue of scsi cmds to process. | |
dc8875e1 | 330 | */ |
1da177e4 LT |
331 | static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost, |
332 | struct list_head *work_q) | |
333 | { | |
334 | struct scsi_cmnd *scmd; | |
335 | struct scsi_device *sdev; | |
336 | int total_failures = 0; | |
337 | int cmd_failed = 0; | |
338 | int cmd_cancel = 0; | |
339 | int devices_failed = 0; | |
340 | ||
341 | shost_for_each_device(sdev, shost) { | |
342 | list_for_each_entry(scmd, work_q, eh_entry) { | |
343 | if (scmd->device == sdev) { | |
344 | ++total_failures; | |
3111b0d1 | 345 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) |
1da177e4 | 346 | ++cmd_cancel; |
0bf8c869 | 347 | else |
1da177e4 LT |
348 | ++cmd_failed; |
349 | } | |
350 | } | |
351 | ||
352 | if (cmd_cancel || cmd_failed) { | |
353 | SCSI_LOG_ERROR_RECOVERY(3, | |
a3a790dc | 354 | shost_printk(KERN_INFO, shost, |
9ccfc756 | 355 | "%s: cmds failed: %d, cancel: %d\n", |
cadbd4a5 | 356 | __func__, cmd_failed, |
9ccfc756 | 357 | cmd_cancel)); |
1da177e4 LT |
358 | cmd_cancel = 0; |
359 | cmd_failed = 0; | |
360 | ++devices_failed; | |
361 | } | |
362 | } | |
363 | ||
91921e01 HR |
364 | SCSI_LOG_ERROR_RECOVERY(2, shost_printk(KERN_INFO, shost, |
365 | "Total of %d commands on %d" | |
366 | " devices require eh work\n", | |
0bf8c869 | 367 | total_failures, devices_failed)); |
1da177e4 LT |
368 | } |
369 | #endif | |
370 | ||
279afdfe EM |
371 | /** |
372 | * scsi_report_lun_change - Set flag on all *other* devices on the same target | |
373 | * to indicate that a UNIT ATTENTION is expected. | |
374 | * @sdev: Device reporting the UNIT ATTENTION | |
375 | */ | |
376 | static void scsi_report_lun_change(struct scsi_device *sdev) | |
377 | { | |
378 | sdev->sdev_target->expecting_lun_change = 1; | |
379 | } | |
380 | ||
381 | /** | |
382 | * scsi_report_sense - Examine scsi sense information and log messages for | |
383 | * certain conditions, also issue uevents for some of them. | |
384 | * @sdev: Device reporting the sense code | |
385 | * @sshdr: sshdr to be examined | |
386 | */ | |
387 | static void scsi_report_sense(struct scsi_device *sdev, | |
388 | struct scsi_sense_hdr *sshdr) | |
389 | { | |
390 | enum scsi_device_event evt_type = SDEV_EVT_MAXBITS; /* i.e. none */ | |
391 | ||
392 | if (sshdr->sense_key == UNIT_ATTENTION) { | |
393 | if (sshdr->asc == 0x3f && sshdr->ascq == 0x03) { | |
394 | evt_type = SDEV_EVT_INQUIRY_CHANGE_REPORTED; | |
395 | sdev_printk(KERN_WARNING, sdev, | |
396 | "Inquiry data has changed"); | |
397 | } else if (sshdr->asc == 0x3f && sshdr->ascq == 0x0e) { | |
398 | evt_type = SDEV_EVT_LUN_CHANGE_REPORTED; | |
399 | scsi_report_lun_change(sdev); | |
400 | sdev_printk(KERN_WARNING, sdev, | |
401 | "Warning! Received an indication that the " | |
402 | "LUN assignments on this target have " | |
403 | "changed. The Linux SCSI layer does not " | |
404 | "automatically remap LUN assignments.\n"); | |
405 | } else if (sshdr->asc == 0x3f) | |
406 | sdev_printk(KERN_WARNING, sdev, | |
407 | "Warning! Received an indication that the " | |
408 | "operating parameters on this target have " | |
409 | "changed. The Linux SCSI layer does not " | |
410 | "automatically adjust these parameters.\n"); | |
411 | ||
412 | if (sshdr->asc == 0x38 && sshdr->ascq == 0x07) { | |
413 | evt_type = SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED; | |
414 | sdev_printk(KERN_WARNING, sdev, | |
415 | "Warning! Received an indication that the " | |
416 | "LUN reached a thin provisioning soft " | |
417 | "threshold.\n"); | |
418 | } | |
419 | ||
420 | if (sshdr->asc == 0x2a && sshdr->ascq == 0x01) { | |
421 | evt_type = SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED; | |
422 | sdev_printk(KERN_WARNING, sdev, | |
423 | "Mode parameters changed"); | |
424 | } else if (sshdr->asc == 0x2a && sshdr->ascq == 0x09) { | |
425 | evt_type = SDEV_EVT_CAPACITY_CHANGE_REPORTED; | |
426 | sdev_printk(KERN_WARNING, sdev, | |
427 | "Capacity data has changed"); | |
428 | } else if (sshdr->asc == 0x2a) | |
429 | sdev_printk(KERN_WARNING, sdev, | |
430 | "Parameters changed"); | |
431 | } | |
432 | ||
433 | if (evt_type != SDEV_EVT_MAXBITS) { | |
434 | set_bit(evt_type, sdev->pending_events); | |
435 | schedule_work(&sdev->event_work); | |
436 | } | |
437 | } | |
438 | ||
1da177e4 LT |
439 | /** |
440 | * scsi_check_sense - Examine scsi cmd sense | |
441 | * @scmd: Cmd to have sense checked. | |
442 | * | |
443 | * Return value: | |
87f14e65 | 444 | * SUCCESS or FAILED or NEEDS_RETRY or ADD_TO_MLQUEUE |
1da177e4 LT |
445 | * |
446 | * Notes: | |
447 | * When a deferred error is detected the current command has | |
448 | * not been executed and needs retrying. | |
dc8875e1 | 449 | */ |
1da177e4 LT |
450 | static int scsi_check_sense(struct scsi_cmnd *scmd) |
451 | { | |
a6a8d9f8 | 452 | struct scsi_device *sdev = scmd->device; |
1da177e4 LT |
453 | struct scsi_sense_hdr sshdr; |
454 | ||
455 | if (! scsi_command_normalize_sense(scmd, &sshdr)) | |
456 | return FAILED; /* no valid sense data */ | |
457 | ||
279afdfe EM |
458 | scsi_report_sense(sdev, &sshdr); |
459 | ||
1da177e4 LT |
460 | if (scsi_sense_is_deferred(&sshdr)) |
461 | return NEEDS_RETRY; | |
462 | ||
a6a8d9f8 CS |
463 | if (sdev->scsi_dh_data && sdev->scsi_dh_data->scsi_dh && |
464 | sdev->scsi_dh_data->scsi_dh->check_sense) { | |
465 | int rc; | |
466 | ||
467 | rc = sdev->scsi_dh_data->scsi_dh->check_sense(sdev, &sshdr); | |
468 | if (rc != SCSI_RETURN_NOT_HANDLED) | |
469 | return rc; | |
470 | /* handler does not care. Drop down to default handling */ | |
471 | } | |
472 | ||
e925cc43 CH |
473 | if (scmd->cmnd[0] == TEST_UNIT_READY && scmd->scsi_done != scsi_eh_done) |
474 | /* | |
475 | * nasty: for mid-layer issued TURs, we need to return the | |
476 | * actual sense data without any recovery attempt. For eh | |
477 | * issued ones, we need to try to recover and interpret | |
478 | */ | |
479 | return SUCCESS; | |
480 | ||
1da177e4 LT |
481 | /* |
482 | * Previous logic looked for FILEMARK, EOM or ILI which are | |
483 | * mainly associated with tapes and returned SUCCESS. | |
484 | */ | |
485 | if (sshdr.response_code == 0x70) { | |
486 | /* fixed format */ | |
487 | if (scmd->sense_buffer[2] & 0xe0) | |
488 | return SUCCESS; | |
489 | } else { | |
490 | /* | |
491 | * descriptor format: look for "stream commands sense data | |
492 | * descriptor" (see SSC-3). Assume single sense data | |
493 | * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG. | |
494 | */ | |
495 | if ((sshdr.additional_length > 3) && | |
496 | (scmd->sense_buffer[8] == 0x4) && | |
497 | (scmd->sense_buffer[11] & 0xe0)) | |
498 | return SUCCESS; | |
499 | } | |
500 | ||
501 | switch (sshdr.sense_key) { | |
502 | case NO_SENSE: | |
503 | return SUCCESS; | |
504 | case RECOVERED_ERROR: | |
505 | return /* soft_error */ SUCCESS; | |
506 | ||
507 | case ABORTED_COMMAND: | |
511e44f4 MP |
508 | if (sshdr.asc == 0x10) /* DIF */ |
509 | return SUCCESS; | |
510 | ||
1da177e4 LT |
511 | return NEEDS_RETRY; |
512 | case NOT_READY: | |
513 | case UNIT_ATTENTION: | |
514 | /* | |
515 | * if we are expecting a cc/ua because of a bus reset that we | |
516 | * performed, treat this just as a retry. otherwise this is | |
517 | * information that we should pass up to the upper-level driver | |
518 | * so that we can deal with it there. | |
519 | */ | |
520 | if (scmd->device->expecting_cc_ua) { | |
dfcf7775 TH |
521 | /* |
522 | * Because some device does not queue unit | |
523 | * attentions correctly, we carefully check | |
524 | * additional sense code and qualifier so as | |
525 | * not to squash media change unit attention. | |
526 | */ | |
527 | if (sshdr.asc != 0x28 || sshdr.ascq != 0x00) { | |
528 | scmd->device->expecting_cc_ua = 0; | |
529 | return NEEDS_RETRY; | |
530 | } | |
1da177e4 | 531 | } |
279afdfe EM |
532 | /* |
533 | * we might also expect a cc/ua if another LUN on the target | |
534 | * reported a UA with an ASC/ASCQ of 3F 0E - | |
535 | * REPORTED LUNS DATA HAS CHANGED. | |
536 | */ | |
537 | if (scmd->device->sdev_target->expecting_lun_change && | |
538 | sshdr.asc == 0x3f && sshdr.ascq == 0x0e) | |
539 | return NEEDS_RETRY; | |
1da177e4 | 540 | /* |
0bf8c869 | 541 | * if the device is in the process of becoming ready, we |
1da177e4 LT |
542 | * should retry. |
543 | */ | |
544 | if ((sshdr.asc == 0x04) && (sshdr.ascq == 0x01)) | |
545 | return NEEDS_RETRY; | |
546 | /* | |
547 | * if the device is not started, we need to wake | |
548 | * the error handler to start the motor | |
549 | */ | |
550 | if (scmd->device->allow_restart && | |
551 | (sshdr.asc == 0x04) && (sshdr.ascq == 0x02)) | |
552 | return FAILED; | |
02e031cb CH |
553 | /* |
554 | * Pass the UA upwards for a determination in the completion | |
555 | * functions. | |
556 | */ | |
557 | return SUCCESS; | |
1da177e4 | 558 | |
63583cca | 559 | /* these are not supported */ |
a9d6ceb8 HR |
560 | case DATA_PROTECT: |
561 | if (sshdr.asc == 0x27 && sshdr.ascq == 0x07) { | |
562 | /* Thin provisioning hard threshold reached */ | |
563 | set_host_byte(scmd, DID_ALLOC_FAILURE); | |
564 | return SUCCESS; | |
565 | } | |
1da177e4 LT |
566 | case COPY_ABORTED: |
567 | case VOLUME_OVERFLOW: | |
568 | case MISCOMPARE: | |
63583cca | 569 | case BLANK_CHECK: |
87f14e65 HR |
570 | set_host_byte(scmd, DID_TARGET_FAILURE); |
571 | return SUCCESS; | |
1da177e4 LT |
572 | |
573 | case MEDIUM_ERROR: | |
fd1b494d LT |
574 | if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */ |
575 | sshdr.asc == 0x13 || /* AMNF DATA FIELD */ | |
576 | sshdr.asc == 0x14) { /* RECORD NOT FOUND */ | |
7e782af5 | 577 | set_host_byte(scmd, DID_MEDIUM_ERROR); |
87f14e65 | 578 | return SUCCESS; |
fd1b494d | 579 | } |
1da177e4 LT |
580 | return NEEDS_RETRY; |
581 | ||
582 | case HARDWARE_ERROR: | |
583 | if (scmd->device->retry_hwerror) | |
bb0003c1 | 584 | return ADD_TO_MLQUEUE; |
1da177e4 | 585 | else |
87f14e65 | 586 | set_host_byte(scmd, DID_TARGET_FAILURE); |
1da177e4 LT |
587 | |
588 | case ILLEGAL_REQUEST: | |
47ac56db MS |
589 | if (sshdr.asc == 0x20 || /* Invalid command operation code */ |
590 | sshdr.asc == 0x21 || /* Logical block address out of range */ | |
591 | sshdr.asc == 0x24 || /* Invalid field in cdb */ | |
592 | sshdr.asc == 0x26) { /* Parameter value invalid */ | |
87f14e65 | 593 | set_host_byte(scmd, DID_TARGET_FAILURE); |
47ac56db MS |
594 | } |
595 | return SUCCESS; | |
596 | ||
1da177e4 LT |
597 | default: |
598 | return SUCCESS; | |
599 | } | |
600 | } | |
601 | ||
4a84067d VD |
602 | static void scsi_handle_queue_ramp_up(struct scsi_device *sdev) |
603 | { | |
604 | struct scsi_host_template *sht = sdev->host->hostt; | |
605 | struct scsi_device *tmp_sdev; | |
606 | ||
c40ecc12 | 607 | if (!sht->track_queue_depth || |
4a84067d VD |
608 | sdev->queue_depth >= sdev->max_queue_depth) |
609 | return; | |
610 | ||
611 | if (time_before(jiffies, | |
612 | sdev->last_queue_ramp_up + sdev->queue_ramp_up_period)) | |
613 | return; | |
614 | ||
615 | if (time_before(jiffies, | |
616 | sdev->last_queue_full_time + sdev->queue_ramp_up_period)) | |
617 | return; | |
618 | ||
619 | /* | |
620 | * Walk all devices of a target and do | |
621 | * ramp up on them. | |
622 | */ | |
623 | shost_for_each_device(tmp_sdev, sdev->host) { | |
624 | if (tmp_sdev->channel != sdev->channel || | |
625 | tmp_sdev->id != sdev->id || | |
626 | tmp_sdev->queue_depth == sdev->max_queue_depth) | |
627 | continue; | |
c40ecc12 | 628 | |
db5ed4df | 629 | scsi_change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1); |
4a84067d VD |
630 | sdev->last_queue_ramp_up = jiffies; |
631 | } | |
632 | } | |
633 | ||
42a6a918 MC |
634 | static void scsi_handle_queue_full(struct scsi_device *sdev) |
635 | { | |
636 | struct scsi_host_template *sht = sdev->host->hostt; | |
637 | struct scsi_device *tmp_sdev; | |
638 | ||
c40ecc12 | 639 | if (!sht->track_queue_depth) |
42a6a918 MC |
640 | return; |
641 | ||
642 | shost_for_each_device(tmp_sdev, sdev->host) { | |
643 | if (tmp_sdev->channel != sdev->channel || | |
644 | tmp_sdev->id != sdev->id) | |
645 | continue; | |
646 | /* | |
647 | * We do not know the number of commands that were at | |
648 | * the device when we got the queue full so we start | |
649 | * from the highest possible value and work our way down. | |
650 | */ | |
c40ecc12 | 651 | scsi_track_queue_full(tmp_sdev, tmp_sdev->queue_depth - 1); |
42a6a918 MC |
652 | } |
653 | } | |
654 | ||
1da177e4 LT |
655 | /** |
656 | * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD. | |
657 | * @scmd: SCSI cmd to examine. | |
658 | * | |
659 | * Notes: | |
660 | * This is *only* called when we are examining the status of commands | |
661 | * queued during error recovery. the main difference here is that we | |
662 | * don't allow for the possibility of retries here, and we are a lot | |
663 | * more restrictive about what we consider acceptable. | |
dc8875e1 | 664 | */ |
1da177e4 LT |
665 | static int scsi_eh_completed_normally(struct scsi_cmnd *scmd) |
666 | { | |
667 | /* | |
668 | * first check the host byte, to see if there is anything in there | |
669 | * that would indicate what we need to do. | |
670 | */ | |
671 | if (host_byte(scmd->result) == DID_RESET) { | |
672 | /* | |
673 | * rats. we are already in the error handler, so we now | |
674 | * get to try and figure out what to do next. if the sense | |
675 | * is valid, we have a pretty good idea of what to do. | |
676 | * if not, we mark it as FAILED. | |
677 | */ | |
678 | return scsi_check_sense(scmd); | |
679 | } | |
680 | if (host_byte(scmd->result) != DID_OK) | |
681 | return FAILED; | |
682 | ||
683 | /* | |
684 | * next, check the message byte. | |
685 | */ | |
686 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
687 | return FAILED; | |
688 | ||
689 | /* | |
690 | * now, check the status byte to see if this indicates | |
691 | * anything special. | |
692 | */ | |
693 | switch (status_byte(scmd->result)) { | |
694 | case GOOD: | |
4a84067d | 695 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 LT |
696 | case COMMAND_TERMINATED: |
697 | return SUCCESS; | |
698 | case CHECK_CONDITION: | |
699 | return scsi_check_sense(scmd); | |
700 | case CONDITION_GOOD: | |
701 | case INTERMEDIATE_GOOD: | |
702 | case INTERMEDIATE_C_GOOD: | |
703 | /* | |
704 | * who knows? FIXME(eric) | |
705 | */ | |
706 | return SUCCESS; | |
5f91bb05 | 707 | case RESERVATION_CONFLICT: |
67110dfd JB |
708 | if (scmd->cmnd[0] == TEST_UNIT_READY) |
709 | /* it is a success, we probed the device and | |
710 | * found it */ | |
711 | return SUCCESS; | |
712 | /* otherwise, we failed to send the command */ | |
713 | return FAILED; | |
1da177e4 | 714 | case QUEUE_FULL: |
42a6a918 MC |
715 | scsi_handle_queue_full(scmd->device); |
716 | /* fall through */ | |
717 | case BUSY: | |
3eb3a928 | 718 | return NEEDS_RETRY; |
1da177e4 LT |
719 | default: |
720 | return FAILED; | |
721 | } | |
722 | return FAILED; | |
723 | } | |
724 | ||
1da177e4 LT |
725 | /** |
726 | * scsi_eh_done - Completion function for error handling. | |
727 | * @scmd: Cmd that is done. | |
dc8875e1 | 728 | */ |
1da177e4 LT |
729 | static void scsi_eh_done(struct scsi_cmnd *scmd) |
730 | { | |
0bf8c869 | 731 | struct completion *eh_action; |
85631672 | 732 | |
91921e01 | 733 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
470613b4 | 734 | "%s result: %x\n", __func__, scmd->result)); |
85631672 MR |
735 | |
736 | eh_action = scmd->device->host->eh_action; | |
737 | if (eh_action) | |
738 | complete(eh_action); | |
1da177e4 LT |
739 | } |
740 | ||
292148f8 BK |
741 | /** |
742 | * scsi_try_host_reset - ask host adapter to reset itself | |
c2b3ebd0 | 743 | * @scmd: SCSI cmd to send host reset. |
dc8875e1 | 744 | */ |
292148f8 BK |
745 | static int scsi_try_host_reset(struct scsi_cmnd *scmd) |
746 | { | |
747 | unsigned long flags; | |
748 | int rtn; | |
0bf8c869 JJ |
749 | struct Scsi_Host *host = scmd->device->host; |
750 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 | 751 | |
91921e01 HR |
752 | SCSI_LOG_ERROR_RECOVERY(3, |
753 | shost_printk(KERN_INFO, host, "Snd Host RST\n")); | |
292148f8 | 754 | |
0bf8c869 | 755 | if (!hostt->eh_host_reset_handler) |
292148f8 BK |
756 | return FAILED; |
757 | ||
0bf8c869 | 758 | rtn = hostt->eh_host_reset_handler(scmd); |
292148f8 BK |
759 | |
760 | if (rtn == SUCCESS) { | |
0bf8c869 | 761 | if (!hostt->skip_settle_delay) |
292148f8 | 762 | ssleep(HOST_RESET_SETTLE_TIME); |
0bf8c869 JJ |
763 | spin_lock_irqsave(host->host_lock, flags); |
764 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
765 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
766 | } |
767 | ||
768 | return rtn; | |
769 | } | |
770 | ||
771 | /** | |
772 | * scsi_try_bus_reset - ask host to perform a bus reset | |
773 | * @scmd: SCSI cmd to send bus reset. | |
dc8875e1 | 774 | */ |
292148f8 BK |
775 | static int scsi_try_bus_reset(struct scsi_cmnd *scmd) |
776 | { | |
777 | unsigned long flags; | |
778 | int rtn; | |
0bf8c869 JJ |
779 | struct Scsi_Host *host = scmd->device->host; |
780 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 | 781 | |
91921e01 HR |
782 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
783 | "%s: Snd Bus RST\n", __func__)); | |
292148f8 | 784 | |
0bf8c869 | 785 | if (!hostt->eh_bus_reset_handler) |
292148f8 BK |
786 | return FAILED; |
787 | ||
0bf8c869 | 788 | rtn = hostt->eh_bus_reset_handler(scmd); |
292148f8 BK |
789 | |
790 | if (rtn == SUCCESS) { | |
0bf8c869 | 791 | if (!hostt->skip_settle_delay) |
292148f8 | 792 | ssleep(BUS_RESET_SETTLE_TIME); |
0bf8c869 JJ |
793 | spin_lock_irqsave(host->host_lock, flags); |
794 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
795 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
796 | } |
797 | ||
798 | return rtn; | |
799 | } | |
800 | ||
30bd7df8 MC |
801 | static void __scsi_report_device_reset(struct scsi_device *sdev, void *data) |
802 | { | |
803 | sdev->was_reset = 1; | |
804 | sdev->expecting_cc_ua = 1; | |
805 | } | |
806 | ||
807 | /** | |
808 | * scsi_try_target_reset - Ask host to perform a target reset | |
809 | * @scmd: SCSI cmd used to send a target reset | |
810 | * | |
811 | * Notes: | |
812 | * There is no timeout for this operation. if this operation is | |
813 | * unreliable for a given host, then the host itself needs to put a | |
814 | * timer on it, and set the host back to a consistent state prior to | |
815 | * returning. | |
816 | */ | |
817 | static int scsi_try_target_reset(struct scsi_cmnd *scmd) | |
818 | { | |
819 | unsigned long flags; | |
820 | int rtn; | |
0bf8c869 JJ |
821 | struct Scsi_Host *host = scmd->device->host; |
822 | struct scsi_host_template *hostt = host->hostt; | |
30bd7df8 | 823 | |
0bf8c869 | 824 | if (!hostt->eh_target_reset_handler) |
30bd7df8 MC |
825 | return FAILED; |
826 | ||
0bf8c869 | 827 | rtn = hostt->eh_target_reset_handler(scmd); |
30bd7df8 | 828 | if (rtn == SUCCESS) { |
0bf8c869 | 829 | spin_lock_irqsave(host->host_lock, flags); |
30bd7df8 MC |
830 | __starget_for_each_device(scsi_target(scmd->device), NULL, |
831 | __scsi_report_device_reset); | |
0bf8c869 | 832 | spin_unlock_irqrestore(host->host_lock, flags); |
30bd7df8 MC |
833 | } |
834 | ||
835 | return rtn; | |
836 | } | |
837 | ||
292148f8 BK |
838 | /** |
839 | * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev | |
840 | * @scmd: SCSI cmd used to send BDR | |
841 | * | |
842 | * Notes: | |
843 | * There is no timeout for this operation. if this operation is | |
844 | * unreliable for a given host, then the host itself needs to put a | |
845 | * timer on it, and set the host back to a consistent state prior to | |
846 | * returning. | |
dc8875e1 | 847 | */ |
292148f8 BK |
848 | static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd) |
849 | { | |
850 | int rtn; | |
0bf8c869 | 851 | struct scsi_host_template *hostt = scmd->device->host->hostt; |
292148f8 | 852 | |
0bf8c869 | 853 | if (!hostt->eh_device_reset_handler) |
292148f8 BK |
854 | return FAILED; |
855 | ||
0bf8c869 | 856 | rtn = hostt->eh_device_reset_handler(scmd); |
30bd7df8 MC |
857 | if (rtn == SUCCESS) |
858 | __scsi_report_device_reset(scmd->device, NULL); | |
292148f8 BK |
859 | return rtn; |
860 | } | |
861 | ||
883a030f HR |
862 | /** |
863 | * scsi_try_to_abort_cmd - Ask host to abort a SCSI command | |
6583f6fb | 864 | * @hostt: SCSI driver host template |
883a030f HR |
865 | * @scmd: SCSI cmd used to send a target reset |
866 | * | |
867 | * Return value: | |
868 | * SUCCESS, FAILED, or FAST_IO_FAIL | |
869 | * | |
870 | * Notes: | |
871 | * SUCCESS does not necessarily indicate that the command | |
872 | * has been aborted; it only indicates that the LLDDs | |
873 | * has cleared all references to that command. | |
874 | * LLDDs should return FAILED only if an abort was required | |
875 | * but could not be executed. LLDDs should return FAST_IO_FAIL | |
876 | * if the device is temporarily unavailable (eg due to a | |
877 | * link down on FibreChannel) | |
878 | */ | |
879 | static int scsi_try_to_abort_cmd(struct scsi_host_template *hostt, | |
880 | struct scsi_cmnd *scmd) | |
292148f8 | 881 | { |
0bf8c869 | 882 | if (!hostt->eh_abort_handler) |
292148f8 BK |
883 | return FAILED; |
884 | ||
0bf8c869 | 885 | return hostt->eh_abort_handler(scmd); |
292148f8 BK |
886 | } |
887 | ||
292148f8 BK |
888 | static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd) |
889 | { | |
0bf8c869 | 890 | if (scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd) != SUCCESS) |
292148f8 | 891 | if (scsi_try_bus_device_reset(scmd) != SUCCESS) |
30bd7df8 MC |
892 | if (scsi_try_target_reset(scmd) != SUCCESS) |
893 | if (scsi_try_bus_reset(scmd) != SUCCESS) | |
894 | scsi_try_host_reset(scmd); | |
292148f8 BK |
895 | } |
896 | ||
1da177e4 | 897 | /** |
3b729f76 | 898 | * scsi_eh_prep_cmnd - Save a scsi command info as part of error recovery |
2dc611de | 899 | * @scmd: SCSI command structure to hijack |
e1c23468 | 900 | * @ses: structure to save restore information |
55db6c1b | 901 | * @cmnd: CDB to send. Can be NULL if no new cmnd is needed |
64a87b24 | 902 | * @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB) |
55db6c1b | 903 | * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored) |
2dc611de | 904 | * |
e1c23468 | 905 | * This function is used to save a scsi command information before re-execution |
55db6c1b BH |
906 | * as part of the error recovery process. If @sense_bytes is 0 the command |
907 | * sent must be one that does not transfer any data. If @sense_bytes != 0 | |
908 | * @cmnd is ignored and this functions sets up a REQUEST_SENSE command | |
909 | * and cmnd buffers to read @sense_bytes into @scmd->sense_buffer. | |
dc8875e1 | 910 | */ |
e1c23468 BH |
911 | void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, |
912 | unsigned char *cmnd, int cmnd_size, unsigned sense_bytes) | |
1da177e4 | 913 | { |
f59114b7 | 914 | struct scsi_device *sdev = scmd->device; |
1da177e4 | 915 | |
631c228c CH |
916 | /* |
917 | * We need saved copies of a number of fields - this is because | |
918 | * error handling may need to overwrite these with different values | |
919 | * to run different commands, and once error handling is complete, | |
920 | * we will need to restore these values prior to running the actual | |
921 | * command. | |
922 | */ | |
e1c23468 | 923 | ses->cmd_len = scmd->cmd_len; |
64a87b24 | 924 | ses->cmnd = scmd->cmnd; |
e1c23468 | 925 | ses->data_direction = scmd->sc_data_direction; |
30b0c37b | 926 | ses->sdb = scmd->sdb; |
6f9a35e2 | 927 | ses->next_rq = scmd->request->next_rq; |
e1c23468 | 928 | ses->result = scmd->result; |
12265709 | 929 | ses->underflow = scmd->underflow; |
db007fc5 | 930 | ses->prot_op = scmd->prot_op; |
631c228c | 931 | |
db007fc5 | 932 | scmd->prot_op = SCSI_PROT_NORMAL; |
c69e6f81 | 933 | scmd->eh_eflags = 0; |
64a87b24 BH |
934 | scmd->cmnd = ses->eh_cmnd; |
935 | memset(scmd->cmnd, 0, BLK_MAX_CDB); | |
30b0c37b | 936 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
6f9a35e2 | 937 | scmd->request->next_rq = NULL; |
644373a4 | 938 | scmd->result = 0; |
30b0c37b | 939 | |
55db6c1b | 940 | if (sense_bytes) { |
30b0c37b BH |
941 | scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE, |
942 | sense_bytes); | |
e1c23468 | 943 | sg_init_one(&ses->sense_sgl, scmd->sense_buffer, |
30b0c37b BH |
944 | scmd->sdb.length); |
945 | scmd->sdb.table.sgl = &ses->sense_sgl; | |
55db6c1b | 946 | scmd->sc_data_direction = DMA_FROM_DEVICE; |
30b0c37b | 947 | scmd->sdb.table.nents = 1; |
55db6c1b | 948 | scmd->cmnd[0] = REQUEST_SENSE; |
30b0c37b | 949 | scmd->cmnd[4] = scmd->sdb.length; |
55db6c1b | 950 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); |
631c228c | 951 | } else { |
631c228c | 952 | scmd->sc_data_direction = DMA_NONE; |
55db6c1b | 953 | if (cmnd) { |
64a87b24 | 954 | BUG_ON(cmnd_size > BLK_MAX_CDB); |
55db6c1b BH |
955 | memcpy(scmd->cmnd, cmnd, cmnd_size); |
956 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); | |
957 | } | |
631c228c CH |
958 | } |
959 | ||
960 | scmd->underflow = 0; | |
631c228c | 961 | |
55db6c1b | 962 | if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN) |
1da177e4 | 963 | scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) | |
f59114b7 | 964 | (sdev->lun << 5 & 0xe0); |
1da177e4 | 965 | |
631c228c CH |
966 | /* |
967 | * Zero the sense buffer. The scsi spec mandates that any | |
968 | * untransferred sense data should be interpreted as being zero. | |
969 | */ | |
b80ca4f7 | 970 | memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); |
e1c23468 BH |
971 | } |
972 | EXPORT_SYMBOL(scsi_eh_prep_cmnd); | |
973 | ||
974 | /** | |
3b729f76 | 975 | * scsi_eh_restore_cmnd - Restore a scsi command info as part of error recovery |
e1c23468 | 976 | * @scmd: SCSI command structure to restore |
477e608c | 977 | * @ses: saved information from a coresponding call to scsi_eh_prep_cmnd |
e1c23468 | 978 | * |
477e608c | 979 | * Undo any damage done by above scsi_eh_prep_cmnd(). |
dc8875e1 | 980 | */ |
e1c23468 BH |
981 | void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses) |
982 | { | |
983 | /* | |
984 | * Restore original data | |
985 | */ | |
986 | scmd->cmd_len = ses->cmd_len; | |
64a87b24 | 987 | scmd->cmnd = ses->cmnd; |
e1c23468 | 988 | scmd->sc_data_direction = ses->data_direction; |
30b0c37b | 989 | scmd->sdb = ses->sdb; |
6f9a35e2 | 990 | scmd->request->next_rq = ses->next_rq; |
e1c23468 | 991 | scmd->result = ses->result; |
12265709 | 992 | scmd->underflow = ses->underflow; |
db007fc5 | 993 | scmd->prot_op = ses->prot_op; |
e1c23468 BH |
994 | } |
995 | EXPORT_SYMBOL(scsi_eh_restore_cmnd); | |
631c228c | 996 | |
e1c23468 | 997 | /** |
3b729f76 | 998 | * scsi_send_eh_cmnd - submit a scsi command as part of error recovery |
e1c23468 BH |
999 | * @scmd: SCSI command structure to hijack |
1000 | * @cmnd: CDB to send | |
1001 | * @cmnd_size: size in bytes of @cmnd | |
1002 | * @timeout: timeout for this request | |
1003 | * @sense_bytes: size of sense data to copy or 0 | |
1004 | * | |
1005 | * This function is used to send a scsi command down to a target device | |
1006 | * as part of the error recovery process. See also scsi_eh_prep_cmnd() above. | |
1007 | * | |
1008 | * Return value: | |
1009 | * SUCCESS or FAILED or NEEDS_RETRY | |
dc8875e1 | 1010 | */ |
e1c23468 BH |
1011 | static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd, |
1012 | int cmnd_size, int timeout, unsigned sense_bytes) | |
1013 | { | |
1014 | struct scsi_device *sdev = scmd->device; | |
1015 | struct Scsi_Host *shost = sdev->host; | |
1016 | DECLARE_COMPLETION_ONSTACK(done); | |
fc73648a | 1017 | unsigned long timeleft = timeout; |
e1c23468 | 1018 | struct scsi_eh_save ses; |
fc73648a | 1019 | const unsigned long stall_for = msecs_to_jiffies(100); |
e1c23468 BH |
1020 | int rtn; |
1021 | ||
fc73648a | 1022 | retry: |
e1c23468 | 1023 | scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes); |
7dfdc9a5 | 1024 | shost->eh_action = &done; |
1da177e4 | 1025 | |
1da177e4 | 1026 | scsi_log_send(scmd); |
f281233d | 1027 | scmd->scsi_done = scsi_eh_done; |
fc73648a HR |
1028 | rtn = shost->hostt->queuecommand(shost, scmd); |
1029 | if (rtn) { | |
1030 | if (timeleft > stall_for) { | |
1031 | scsi_eh_restore_cmnd(scmd, &ses); | |
1032 | timeleft -= stall_for; | |
1033 | msleep(jiffies_to_msecs(stall_for)); | |
1034 | goto retry; | |
1035 | } | |
1036 | /* signal not to enter either branch of the if () below */ | |
1037 | timeleft = 0; | |
511833ac | 1038 | rtn = FAILED; |
fc73648a HR |
1039 | } else { |
1040 | timeleft = wait_for_completion_timeout(&done, timeout); | |
ac61d195 | 1041 | rtn = SUCCESS; |
fc73648a | 1042 | } |
1da177e4 | 1043 | |
f59114b7 | 1044 | shost->eh_action = NULL; |
1da177e4 | 1045 | |
fc73648a | 1046 | scsi_log_completion(scmd, rtn); |
1da177e4 | 1047 | |
91921e01 | 1048 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
470613b4 HR |
1049 | "%s timeleft: %ld\n", |
1050 | __func__, timeleft)); | |
1da177e4 LT |
1051 | |
1052 | /* | |
fc73648a HR |
1053 | * If there is time left scsi_eh_done got called, and we will examine |
1054 | * the actual status codes to see whether the command actually did | |
1055 | * complete normally, else if we have a zero return and no time left, | |
1056 | * the command must still be pending, so abort it and return FAILED. | |
1057 | * If we never actually managed to issue the command, because | |
1058 | * ->queuecommand() kept returning non zero, use the rtn = FAILED | |
1059 | * value above (so don't execute either branch of the if) | |
1da177e4 | 1060 | */ |
7dfdc9a5 | 1061 | if (timeleft) { |
1da177e4 | 1062 | rtn = scsi_eh_completed_normally(scmd); |
91921e01 HR |
1063 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
1064 | "%s: scsi_eh_completed_normally %x\n", __func__, rtn)); | |
7dfdc9a5 | 1065 | |
1da177e4 LT |
1066 | switch (rtn) { |
1067 | case SUCCESS: | |
1068 | case NEEDS_RETRY: | |
1069 | case FAILED: | |
1070 | break; | |
6e883b0e HR |
1071 | case ADD_TO_MLQUEUE: |
1072 | rtn = NEEDS_RETRY; | |
1073 | break; | |
1da177e4 LT |
1074 | default: |
1075 | rtn = FAILED; | |
1076 | break; | |
1077 | } | |
511833ac | 1078 | } else if (rtn != FAILED) { |
292148f8 | 1079 | scsi_abort_eh_cmnd(scmd); |
7dfdc9a5 | 1080 | rtn = FAILED; |
1da177e4 LT |
1081 | } |
1082 | ||
e1c23468 | 1083 | scsi_eh_restore_cmnd(scmd, &ses); |
18a4d0a2 | 1084 | |
1da177e4 LT |
1085 | return rtn; |
1086 | } | |
1087 | ||
1088 | /** | |
1089 | * scsi_request_sense - Request sense data from a particular target. | |
1090 | * @scmd: SCSI cmd for request sense. | |
1091 | * | |
1092 | * Notes: | |
1093 | * Some hosts automatically obtain this information, others require | |
1094 | * that we obtain it on our own. This function will *not* return until | |
1095 | * the command either times out, or it completes. | |
dc8875e1 | 1096 | */ |
1da177e4 LT |
1097 | static int scsi_request_sense(struct scsi_cmnd *scmd) |
1098 | { | |
0816c925 | 1099 | return scsi_send_eh_cmnd(scmd, NULL, 0, scmd->device->eh_timeout, ~0); |
1da177e4 LT |
1100 | } |
1101 | ||
2451079b JB |
1102 | static int scsi_eh_action(struct scsi_cmnd *scmd, int rtn) |
1103 | { | |
1104 | if (scmd->request->cmd_type != REQ_TYPE_BLOCK_PC) { | |
1105 | struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd); | |
1106 | if (sdrv->eh_action) | |
1107 | rtn = sdrv->eh_action(scmd, rtn); | |
1108 | } | |
1109 | return rtn; | |
1110 | } | |
1111 | ||
1da177e4 LT |
1112 | /** |
1113 | * scsi_eh_finish_cmd - Handle a cmd that eh is finished with. | |
1114 | * @scmd: Original SCSI cmd that eh has finished. | |
1115 | * @done_q: Queue for processed commands. | |
1116 | * | |
1117 | * Notes: | |
1118 | * We don't want to use the normal command completion while we are are | |
1119 | * still handling errors - it may cause other commands to be queued, | |
eb44820c | 1120 | * and that would disturb what we are doing. Thus we really want to |
1da177e4 LT |
1121 | * keep a list of pending commands for final completion, and once we |
1122 | * are ready to leave error handling we handle completion for real. | |
dc8875e1 | 1123 | */ |
041c5fc3 | 1124 | void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q) |
1da177e4 LT |
1125 | { |
1126 | scmd->device->host->host_failed--; | |
3111b0d1 | 1127 | scmd->eh_eflags = 0; |
1da177e4 LT |
1128 | list_move_tail(&scmd->eh_entry, done_q); |
1129 | } | |
041c5fc3 | 1130 | EXPORT_SYMBOL(scsi_eh_finish_cmd); |
1da177e4 LT |
1131 | |
1132 | /** | |
1133 | * scsi_eh_get_sense - Get device sense data. | |
1134 | * @work_q: Queue of commands to process. | |
eb44820c | 1135 | * @done_q: Queue of processed commands. |
1da177e4 LT |
1136 | * |
1137 | * Description: | |
1138 | * See if we need to request sense information. if so, then get it | |
0bf8c869 | 1139 | * now, so we have a better idea of what to do. |
1da177e4 LT |
1140 | * |
1141 | * Notes: | |
1142 | * This has the unfortunate side effect that if a shost adapter does | |
eb44820c | 1143 | * not automatically request sense information, we end up shutting |
1da177e4 LT |
1144 | * it down before we request it. |
1145 | * | |
1146 | * All drivers should request sense information internally these days, | |
1147 | * so for now all I have to say is tough noogies if you end up in here. | |
1148 | * | |
1149 | * XXX: Long term this code should go away, but that needs an audit of | |
1150 | * all LLDDs first. | |
dc8875e1 | 1151 | */ |
dca84e46 DW |
1152 | int scsi_eh_get_sense(struct list_head *work_q, |
1153 | struct list_head *done_q) | |
1da177e4 | 1154 | { |
937abeaa | 1155 | struct scsi_cmnd *scmd, *next; |
b4562022 | 1156 | struct Scsi_Host *shost; |
1da177e4 LT |
1157 | int rtn; |
1158 | ||
937abeaa | 1159 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 1160 | if ((scmd->eh_eflags & SCSI_EH_CANCEL_CMD) || |
1da177e4 LT |
1161 | SCSI_SENSE_VALID(scmd)) |
1162 | continue; | |
1163 | ||
b4562022 | 1164 | shost = scmd->device->host; |
b4562022 | 1165 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 | 1166 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1167 | scmd_printk(KERN_INFO, scmd, |
1168 | "%s: skip request sense, past eh deadline\n", | |
1169 | current->comm)); | |
b4562022 HR |
1170 | break; |
1171 | } | |
d555a2ab JB |
1172 | if (status_byte(scmd->result) != CHECK_CONDITION) |
1173 | /* | |
1174 | * don't request sense if there's no check condition | |
1175 | * status because the error we're processing isn't one | |
1176 | * that has a sense code (and some devices get | |
1177 | * confused by sense requests out of the blue) | |
1178 | */ | |
1179 | continue; | |
1180 | ||
3bf743e7 JG |
1181 | SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd, |
1182 | "%s: requesting sense\n", | |
1183 | current->comm)); | |
1da177e4 LT |
1184 | rtn = scsi_request_sense(scmd); |
1185 | if (rtn != SUCCESS) | |
1186 | continue; | |
1187 | ||
91921e01 | 1188 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
470613b4 | 1189 | "sense requested, result %x\n", scmd->result)); |
d811b848 | 1190 | SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense(scmd)); |
1da177e4 LT |
1191 | |
1192 | rtn = scsi_decide_disposition(scmd); | |
1193 | ||
1194 | /* | |
1195 | * if the result was normal, then just pass it along to the | |
1196 | * upper level. | |
1197 | */ | |
1198 | if (rtn == SUCCESS) | |
1199 | /* we don't want this command reissued, just | |
1200 | * finished with the sense data, so set | |
1201 | * retries to the max allowed to ensure it | |
1202 | * won't get reissued */ | |
1203 | scmd->retries = scmd->allowed; | |
1204 | else if (rtn != NEEDS_RETRY) | |
1205 | continue; | |
1206 | ||
1207 | scsi_eh_finish_cmd(scmd, done_q); | |
1208 | } | |
1209 | ||
1210 | return list_empty(work_q); | |
1211 | } | |
dca84e46 | 1212 | EXPORT_SYMBOL_GPL(scsi_eh_get_sense); |
1da177e4 | 1213 | |
1da177e4 LT |
1214 | /** |
1215 | * scsi_eh_tur - Send TUR to device. | |
eb44820c | 1216 | * @scmd: &scsi_cmnd to send TUR |
1da177e4 LT |
1217 | * |
1218 | * Return value: | |
1219 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1220 | */ |
1da177e4 LT |
1221 | static int scsi_eh_tur(struct scsi_cmnd *scmd) |
1222 | { | |
1223 | static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0}; | |
1224 | int retry_cnt = 1, rtn; | |
1225 | ||
1226 | retry_tur: | |
0816c925 MP |
1227 | rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, |
1228 | scmd->device->eh_timeout, 0); | |
1da177e4 | 1229 | |
91921e01 | 1230 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
470613b4 | 1231 | "%s return: %x\n", __func__, rtn)); |
631c228c CH |
1232 | |
1233 | switch (rtn) { | |
1234 | case NEEDS_RETRY: | |
1da177e4 LT |
1235 | if (retry_cnt--) |
1236 | goto retry_tur; | |
631c228c CH |
1237 | /*FALLTHRU*/ |
1238 | case SUCCESS: | |
e47373ec | 1239 | return 0; |
631c228c CH |
1240 | default: |
1241 | return 1; | |
e47373ec | 1242 | } |
1da177e4 LT |
1243 | } |
1244 | ||
3eef6257 DJ |
1245 | /** |
1246 | * scsi_eh_test_devices - check if devices are responding from error recovery. | |
1247 | * @cmd_list: scsi commands in error recovery. | |
74cf298f RD |
1248 | * @work_q: queue for commands which still need more error recovery |
1249 | * @done_q: queue for commands which are finished | |
1250 | * @try_stu: boolean on if a STU command should be tried in addition to TUR. | |
3eef6257 DJ |
1251 | * |
1252 | * Decription: | |
1253 | * Tests if devices are in a working state. Commands to devices now in | |
1254 | * a working state are sent to the done_q while commands to devices which | |
1255 | * are still failing to respond are returned to the work_q for more | |
1256 | * processing. | |
1257 | **/ | |
1258 | static int scsi_eh_test_devices(struct list_head *cmd_list, | |
1259 | struct list_head *work_q, | |
1260 | struct list_head *done_q, int try_stu) | |
1261 | { | |
1262 | struct scsi_cmnd *scmd, *next; | |
1263 | struct scsi_device *sdev; | |
1264 | int finish_cmds; | |
1265 | ||
1266 | while (!list_empty(cmd_list)) { | |
1267 | scmd = list_entry(cmd_list->next, struct scsi_cmnd, eh_entry); | |
1268 | sdev = scmd->device; | |
1269 | ||
b4562022 | 1270 | if (!try_stu) { |
b4562022 HR |
1271 | if (scsi_host_eh_past_deadline(sdev->host)) { |
1272 | /* Push items back onto work_q */ | |
1273 | list_splice_init(cmd_list, work_q); | |
b4562022 | 1274 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1275 | sdev_printk(KERN_INFO, sdev, |
1276 | "%s: skip test device, past eh deadline", | |
1277 | current->comm)); | |
b4562022 HR |
1278 | break; |
1279 | } | |
b4562022 HR |
1280 | } |
1281 | ||
3eef6257 DJ |
1282 | finish_cmds = !scsi_device_online(scmd->device) || |
1283 | (try_stu && !scsi_eh_try_stu(scmd) && | |
1284 | !scsi_eh_tur(scmd)) || | |
1285 | !scsi_eh_tur(scmd); | |
1286 | ||
1287 | list_for_each_entry_safe(scmd, next, cmd_list, eh_entry) | |
1288 | if (scmd->device == sdev) { | |
2451079b JB |
1289 | if (finish_cmds && |
1290 | (try_stu || | |
1291 | scsi_eh_action(scmd, SUCCESS) == SUCCESS)) | |
3eef6257 DJ |
1292 | scsi_eh_finish_cmd(scmd, done_q); |
1293 | else | |
1294 | list_move_tail(&scmd->eh_entry, work_q); | |
1295 | } | |
1296 | } | |
1297 | return list_empty(work_q); | |
1298 | } | |
1299 | ||
1300 | ||
1da177e4 | 1301 | /** |
eb44820c RL |
1302 | * scsi_eh_abort_cmds - abort pending commands. |
1303 | * @work_q: &list_head for pending commands. | |
1304 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1305 | * |
1306 | * Decription: | |
1307 | * Try and see whether or not it makes sense to try and abort the | |
eb44820c RL |
1308 | * running command. This only works out to be the case if we have one |
1309 | * command that has timed out. If the command simply failed, it makes | |
1da177e4 LT |
1310 | * no sense to try and abort the command, since as far as the shost |
1311 | * adapter is concerned, it isn't running. | |
dc8875e1 | 1312 | */ |
1da177e4 LT |
1313 | static int scsi_eh_abort_cmds(struct list_head *work_q, |
1314 | struct list_head *done_q) | |
1315 | { | |
937abeaa | 1316 | struct scsi_cmnd *scmd, *next; |
3eef6257 | 1317 | LIST_HEAD(check_list); |
1da177e4 | 1318 | int rtn; |
b4562022 | 1319 | struct Scsi_Host *shost; |
1da177e4 | 1320 | |
937abeaa | 1321 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 1322 | if (!(scmd->eh_eflags & SCSI_EH_CANCEL_CMD)) |
1da177e4 | 1323 | continue; |
b4562022 | 1324 | shost = scmd->device->host; |
b4562022 | 1325 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 HR |
1326 | list_splice_init(&check_list, work_q); |
1327 | SCSI_LOG_ERROR_RECOVERY(3, | |
a222b1e2 HR |
1328 | scmd_printk(KERN_INFO, scmd, |
1329 | "%s: skip aborting cmd, past eh deadline\n", | |
1330 | current->comm)); | |
b4562022 HR |
1331 | return list_empty(work_q); |
1332 | } | |
91921e01 | 1333 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1334 | scmd_printk(KERN_INFO, scmd, |
1335 | "%s: aborting cmd\n", current->comm)); | |
b4562022 | 1336 | rtn = scsi_try_to_abort_cmd(shost->hostt, scmd); |
6fd046f9 | 1337 | if (rtn == FAILED) { |
91921e01 | 1338 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1339 | scmd_printk(KERN_INFO, scmd, |
1340 | "%s: aborting cmd failed\n", | |
1341 | current->comm)); | |
6fd046f9 HR |
1342 | list_splice_init(&check_list, work_q); |
1343 | return list_empty(work_q); | |
1344 | } | |
1345 | scmd->eh_eflags &= ~SCSI_EH_CANCEL_CMD; | |
1346 | if (rtn == FAST_IO_FAIL) | |
1347 | scsi_eh_finish_cmd(scmd, done_q); | |
1348 | else | |
1349 | list_move_tail(&scmd->eh_entry, &check_list); | |
1da177e4 LT |
1350 | } |
1351 | ||
3eef6257 | 1352 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4 LT |
1353 | } |
1354 | ||
1da177e4 LT |
1355 | /** |
1356 | * scsi_eh_try_stu - Send START_UNIT to device. | |
eb44820c | 1357 | * @scmd: &scsi_cmnd to send START_UNIT |
1da177e4 LT |
1358 | * |
1359 | * Return value: | |
1360 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1361 | */ |
1da177e4 LT |
1362 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd) |
1363 | { | |
1364 | static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0}; | |
1da177e4 | 1365 | |
631c228c | 1366 | if (scmd->device->allow_restart) { |
ed773e66 BK |
1367 | int i, rtn = NEEDS_RETRY; |
1368 | ||
1369 | for (i = 0; rtn == NEEDS_RETRY && i < 2; i++) | |
9728c081 | 1370 | rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0); |
1da177e4 | 1371 | |
631c228c CH |
1372 | if (rtn == SUCCESS) |
1373 | return 0; | |
1374 | } | |
1da177e4 | 1375 | |
1da177e4 LT |
1376 | return 1; |
1377 | } | |
1378 | ||
1379 | /** | |
1380 | * scsi_eh_stu - send START_UNIT if needed | |
eb44820c | 1381 | * @shost: &scsi host being recovered. |
74cf298f | 1382 | * @work_q: &list_head for pending commands. |
eb44820c | 1383 | * @done_q: &list_head for processed commands. |
1da177e4 LT |
1384 | * |
1385 | * Notes: | |
1386 | * If commands are failing due to not ready, initializing command required, | |
0bf8c869 | 1387 | * try revalidating the device, which will end up sending a start unit. |
dc8875e1 | 1388 | */ |
1da177e4 LT |
1389 | static int scsi_eh_stu(struct Scsi_Host *shost, |
1390 | struct list_head *work_q, | |
1391 | struct list_head *done_q) | |
1392 | { | |
937abeaa | 1393 | struct scsi_cmnd *scmd, *stu_scmd, *next; |
1da177e4 LT |
1394 | struct scsi_device *sdev; |
1395 | ||
1396 | shost_for_each_device(sdev, shost) { | |
b4562022 | 1397 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 | 1398 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1399 | sdev_printk(KERN_INFO, sdev, |
1400 | "%s: skip START_UNIT, past eh deadline\n", | |
1401 | current->comm)); | |
b4562022 HR |
1402 | break; |
1403 | } | |
1da177e4 LT |
1404 | stu_scmd = NULL; |
1405 | list_for_each_entry(scmd, work_q, eh_entry) | |
1406 | if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) && | |
1407 | scsi_check_sense(scmd) == FAILED ) { | |
1408 | stu_scmd = scmd; | |
1409 | break; | |
1410 | } | |
1411 | ||
1412 | if (!stu_scmd) | |
1413 | continue; | |
1414 | ||
91921e01 | 1415 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1416 | sdev_printk(KERN_INFO, sdev, |
1417 | "%s: Sending START_UNIT\n", | |
1418 | current->comm)); | |
1da177e4 LT |
1419 | |
1420 | if (!scsi_eh_try_stu(stu_scmd)) { | |
1421 | if (!scsi_device_online(sdev) || | |
1422 | !scsi_eh_tur(stu_scmd)) { | |
937abeaa CH |
1423 | list_for_each_entry_safe(scmd, next, |
1424 | work_q, eh_entry) { | |
2451079b JB |
1425 | if (scmd->device == sdev && |
1426 | scsi_eh_action(scmd, SUCCESS) == SUCCESS) | |
1da177e4 LT |
1427 | scsi_eh_finish_cmd(scmd, done_q); |
1428 | } | |
1429 | } | |
1430 | } else { | |
1431 | SCSI_LOG_ERROR_RECOVERY(3, | |
a222b1e2 HR |
1432 | sdev_printk(KERN_INFO, sdev, |
1433 | "%s: START_UNIT failed\n", | |
1434 | current->comm)); | |
1da177e4 LT |
1435 | } |
1436 | } | |
1437 | ||
1438 | return list_empty(work_q); | |
1439 | } | |
1440 | ||
1441 | ||
1442 | /** | |
1443 | * scsi_eh_bus_device_reset - send bdr if needed | |
1444 | * @shost: scsi host being recovered. | |
74cf298f | 1445 | * @work_q: &list_head for pending commands. |
eb44820c | 1446 | * @done_q: &list_head for processed commands. |
1da177e4 LT |
1447 | * |
1448 | * Notes: | |
eb44820c | 1449 | * Try a bus device reset. Still, look to see whether we have multiple |
1da177e4 LT |
1450 | * devices that are jammed or not - if we have multiple devices, it |
1451 | * makes no sense to try bus_device_reset - we really would need to try | |
0bf8c869 | 1452 | * a bus_reset instead. |
dc8875e1 | 1453 | */ |
1da177e4 LT |
1454 | static int scsi_eh_bus_device_reset(struct Scsi_Host *shost, |
1455 | struct list_head *work_q, | |
1456 | struct list_head *done_q) | |
1457 | { | |
937abeaa | 1458 | struct scsi_cmnd *scmd, *bdr_scmd, *next; |
1da177e4 LT |
1459 | struct scsi_device *sdev; |
1460 | int rtn; | |
1461 | ||
1462 | shost_for_each_device(sdev, shost) { | |
b4562022 | 1463 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 | 1464 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1465 | sdev_printk(KERN_INFO, sdev, |
1466 | "%s: skip BDR, past eh deadline\n", | |
1467 | current->comm)); | |
b4562022 HR |
1468 | break; |
1469 | } | |
1da177e4 LT |
1470 | bdr_scmd = NULL; |
1471 | list_for_each_entry(scmd, work_q, eh_entry) | |
1472 | if (scmd->device == sdev) { | |
1473 | bdr_scmd = scmd; | |
1474 | break; | |
1475 | } | |
1476 | ||
1477 | if (!bdr_scmd) | |
1478 | continue; | |
1479 | ||
91921e01 | 1480 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1481 | sdev_printk(KERN_INFO, sdev, |
1482 | "%s: Sending BDR\n", current->comm)); | |
1da177e4 | 1483 | rtn = scsi_try_bus_device_reset(bdr_scmd); |
2f2eb587 | 1484 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
1da177e4 | 1485 | if (!scsi_device_online(sdev) || |
2f2eb587 | 1486 | rtn == FAST_IO_FAIL || |
1da177e4 | 1487 | !scsi_eh_tur(bdr_scmd)) { |
937abeaa CH |
1488 | list_for_each_entry_safe(scmd, next, |
1489 | work_q, eh_entry) { | |
2451079b JB |
1490 | if (scmd->device == sdev && |
1491 | scsi_eh_action(scmd, rtn) != FAILED) | |
1da177e4 LT |
1492 | scsi_eh_finish_cmd(scmd, |
1493 | done_q); | |
1494 | } | |
1495 | } | |
1496 | } else { | |
91921e01 | 1497 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1498 | sdev_printk(KERN_INFO, sdev, |
1499 | "%s: BDR failed\n", current->comm)); | |
1da177e4 LT |
1500 | } |
1501 | } | |
1502 | ||
1503 | return list_empty(work_q); | |
1504 | } | |
1505 | ||
30bd7df8 MC |
1506 | /** |
1507 | * scsi_eh_target_reset - send target reset if needed | |
1508 | * @shost: scsi host being recovered. | |
74cf298f | 1509 | * @work_q: &list_head for pending commands. |
30bd7df8 MC |
1510 | * @done_q: &list_head for processed commands. |
1511 | * | |
1512 | * Notes: | |
1513 | * Try a target reset. | |
1514 | */ | |
1515 | static int scsi_eh_target_reset(struct Scsi_Host *shost, | |
1516 | struct list_head *work_q, | |
1517 | struct list_head *done_q) | |
1518 | { | |
98db5195 | 1519 | LIST_HEAD(tmp_list); |
3eef6257 | 1520 | LIST_HEAD(check_list); |
30bd7df8 | 1521 | |
98db5195 JB |
1522 | list_splice_init(work_q, &tmp_list); |
1523 | ||
1524 | while (!list_empty(&tmp_list)) { | |
1525 | struct scsi_cmnd *next, *scmd; | |
1526 | int rtn; | |
1527 | unsigned int id; | |
b4562022 | 1528 | |
b4562022 | 1529 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 HR |
1530 | /* push back on work queue for further processing */ |
1531 | list_splice_init(&check_list, work_q); | |
1532 | list_splice_init(&tmp_list, work_q); | |
1533 | SCSI_LOG_ERROR_RECOVERY(3, | |
1534 | shost_printk(KERN_INFO, shost, | |
a222b1e2 HR |
1535 | "%s: Skip target reset, past eh deadline\n", |
1536 | current->comm)); | |
b4562022 HR |
1537 | return list_empty(work_q); |
1538 | } | |
98db5195 JB |
1539 | |
1540 | scmd = list_entry(tmp_list.next, struct scsi_cmnd, eh_entry); | |
1541 | id = scmd_id(scmd); | |
30bd7df8 | 1542 | |
91921e01 HR |
1543 | SCSI_LOG_ERROR_RECOVERY(3, |
1544 | shost_printk(KERN_INFO, shost, | |
1545 | "%s: Sending target reset to target %d\n", | |
1546 | current->comm, id)); | |
98db5195 JB |
1547 | rtn = scsi_try_target_reset(scmd); |
1548 | if (rtn != SUCCESS && rtn != FAST_IO_FAIL) | |
91921e01 HR |
1549 | SCSI_LOG_ERROR_RECOVERY(3, |
1550 | shost_printk(KERN_INFO, shost, | |
1551 | "%s: Target reset failed" | |
1552 | " target: %d\n", | |
1553 | current->comm, id)); | |
98db5195 JB |
1554 | list_for_each_entry_safe(scmd, next, &tmp_list, eh_entry) { |
1555 | if (scmd_id(scmd) != id) | |
1556 | continue; | |
1557 | ||
3eef6257 DJ |
1558 | if (rtn == SUCCESS) |
1559 | list_move_tail(&scmd->eh_entry, &check_list); | |
1560 | else if (rtn == FAST_IO_FAIL) | |
98db5195 JB |
1561 | scsi_eh_finish_cmd(scmd, done_q); |
1562 | else | |
1563 | /* push back on work queue for further processing */ | |
1564 | list_move(&scmd->eh_entry, work_q); | |
1565 | } | |
1566 | } | |
30bd7df8 | 1567 | |
3eef6257 | 1568 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
30bd7df8 MC |
1569 | } |
1570 | ||
1da177e4 | 1571 | /** |
0bf8c869 | 1572 | * scsi_eh_bus_reset - send a bus reset |
eb44820c | 1573 | * @shost: &scsi host being recovered. |
74cf298f | 1574 | * @work_q: &list_head for pending commands. |
eb44820c | 1575 | * @done_q: &list_head for processed commands. |
dc8875e1 | 1576 | */ |
1da177e4 LT |
1577 | static int scsi_eh_bus_reset(struct Scsi_Host *shost, |
1578 | struct list_head *work_q, | |
1579 | struct list_head *done_q) | |
1580 | { | |
937abeaa | 1581 | struct scsi_cmnd *scmd, *chan_scmd, *next; |
3eef6257 | 1582 | LIST_HEAD(check_list); |
1da177e4 LT |
1583 | unsigned int channel; |
1584 | int rtn; | |
1585 | ||
1586 | /* | |
1587 | * we really want to loop over the various channels, and do this on | |
1588 | * a channel by channel basis. we should also check to see if any | |
1589 | * of the failed commands are on soft_reset devices, and if so, skip | |
0bf8c869 | 1590 | * the reset. |
1da177e4 LT |
1591 | */ |
1592 | ||
1593 | for (channel = 0; channel <= shost->max_channel; channel++) { | |
b4562022 | 1594 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 HR |
1595 | list_splice_init(&check_list, work_q); |
1596 | SCSI_LOG_ERROR_RECOVERY(3, | |
1597 | shost_printk(KERN_INFO, shost, | |
a222b1e2 HR |
1598 | "%s: skip BRST, past eh deadline\n", |
1599 | current->comm)); | |
b4562022 HR |
1600 | return list_empty(work_q); |
1601 | } | |
b4562022 | 1602 | |
1da177e4 LT |
1603 | chan_scmd = NULL; |
1604 | list_for_each_entry(scmd, work_q, eh_entry) { | |
422c0d61 | 1605 | if (channel == scmd_channel(scmd)) { |
1da177e4 LT |
1606 | chan_scmd = scmd; |
1607 | break; | |
1608 | /* | |
1609 | * FIXME add back in some support for | |
1610 | * soft_reset devices. | |
1611 | */ | |
1612 | } | |
1613 | } | |
1614 | ||
1615 | if (!chan_scmd) | |
1616 | continue; | |
91921e01 HR |
1617 | SCSI_LOG_ERROR_RECOVERY(3, |
1618 | shost_printk(KERN_INFO, shost, | |
1619 | "%s: Sending BRST chan: %d\n", | |
1620 | current->comm, channel)); | |
1da177e4 | 1621 | rtn = scsi_try_bus_reset(chan_scmd); |
2f2eb587 | 1622 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
937abeaa | 1623 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3eef6257 DJ |
1624 | if (channel == scmd_channel(scmd)) { |
1625 | if (rtn == FAST_IO_FAIL) | |
1da177e4 LT |
1626 | scsi_eh_finish_cmd(scmd, |
1627 | done_q); | |
3eef6257 DJ |
1628 | else |
1629 | list_move_tail(&scmd->eh_entry, | |
1630 | &check_list); | |
1631 | } | |
1da177e4 LT |
1632 | } |
1633 | } else { | |
91921e01 HR |
1634 | SCSI_LOG_ERROR_RECOVERY(3, |
1635 | shost_printk(KERN_INFO, shost, | |
1636 | "%s: BRST failed chan: %d\n", | |
1637 | current->comm, channel)); | |
1da177e4 LT |
1638 | } |
1639 | } | |
3eef6257 | 1640 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4 LT |
1641 | } |
1642 | ||
1643 | /** | |
0bf8c869 | 1644 | * scsi_eh_host_reset - send a host reset |
74cf298f RD |
1645 | * @shost: host to be reset. |
1646 | * @work_q: &list_head for pending commands. | |
1647 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1648 | */ |
91921e01 HR |
1649 | static int scsi_eh_host_reset(struct Scsi_Host *shost, |
1650 | struct list_head *work_q, | |
1da177e4 LT |
1651 | struct list_head *done_q) |
1652 | { | |
937abeaa | 1653 | struct scsi_cmnd *scmd, *next; |
3eef6257 | 1654 | LIST_HEAD(check_list); |
1da177e4 | 1655 | int rtn; |
1da177e4 LT |
1656 | |
1657 | if (!list_empty(work_q)) { | |
1658 | scmd = list_entry(work_q->next, | |
1659 | struct scsi_cmnd, eh_entry); | |
1660 | ||
91921e01 HR |
1661 | SCSI_LOG_ERROR_RECOVERY(3, |
1662 | shost_printk(KERN_INFO, shost, | |
1663 | "%s: Sending HRST\n", | |
1664 | current->comm)); | |
1da177e4 LT |
1665 | |
1666 | rtn = scsi_try_host_reset(scmd); | |
3eef6257 DJ |
1667 | if (rtn == SUCCESS) { |
1668 | list_splice_init(work_q, &check_list); | |
1669 | } else if (rtn == FAST_IO_FAIL) { | |
937abeaa | 1670 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1da177e4 LT |
1671 | scsi_eh_finish_cmd(scmd, done_q); |
1672 | } | |
1673 | } else { | |
91921e01 HR |
1674 | SCSI_LOG_ERROR_RECOVERY(3, |
1675 | shost_printk(KERN_INFO, shost, | |
1676 | "%s: HRST failed\n", | |
1677 | current->comm)); | |
1da177e4 LT |
1678 | } |
1679 | } | |
3eef6257 | 1680 | return scsi_eh_test_devices(&check_list, work_q, done_q, 1); |
1da177e4 LT |
1681 | } |
1682 | ||
1683 | /** | |
1684 | * scsi_eh_offline_sdevs - offline scsi devices that fail to recover | |
74cf298f RD |
1685 | * @work_q: &list_head for pending commands. |
1686 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1687 | */ |
1da177e4 LT |
1688 | static void scsi_eh_offline_sdevs(struct list_head *work_q, |
1689 | struct list_head *done_q) | |
1690 | { | |
937abeaa | 1691 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1692 | |
937abeaa | 1693 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
31765d7d MW |
1694 | sdev_printk(KERN_INFO, scmd->device, "Device offlined - " |
1695 | "not ready after error recovery\n"); | |
1da177e4 | 1696 | scsi_device_set_state(scmd->device, SDEV_OFFLINE); |
3111b0d1 | 1697 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) { |
1da177e4 LT |
1698 | /* |
1699 | * FIXME: Handle lost cmds. | |
1700 | */ | |
1701 | } | |
1702 | scsi_eh_finish_cmd(scmd, done_q); | |
1703 | } | |
1704 | return; | |
1705 | } | |
1706 | ||
4a27446f | 1707 | /** |
e494f6a7 | 1708 | * scsi_noretry_cmd - determine if command should be failed fast |
4a27446f MC |
1709 | * @scmd: SCSI cmd to examine. |
1710 | */ | |
1711 | int scsi_noretry_cmd(struct scsi_cmnd *scmd) | |
1712 | { | |
1713 | switch (host_byte(scmd->result)) { | |
1714 | case DID_OK: | |
1715 | break; | |
e494f6a7 HR |
1716 | case DID_TIME_OUT: |
1717 | goto check_type; | |
4a27446f | 1718 | case DID_BUS_BUSY: |
33659ebb | 1719 | return (scmd->request->cmd_flags & REQ_FAILFAST_TRANSPORT); |
4a27446f | 1720 | case DID_PARITY: |
33659ebb | 1721 | return (scmd->request->cmd_flags & REQ_FAILFAST_DEV); |
4a27446f MC |
1722 | case DID_ERROR: |
1723 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1724 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1725 | return 0; | |
1726 | /* fall through */ | |
1727 | case DID_SOFT_ERROR: | |
33659ebb | 1728 | return (scmd->request->cmd_flags & REQ_FAILFAST_DRIVER); |
4a27446f MC |
1729 | } |
1730 | ||
e494f6a7 HR |
1731 | if (status_byte(scmd->result) != CHECK_CONDITION) |
1732 | return 0; | |
4a27446f | 1733 | |
e494f6a7 HR |
1734 | check_type: |
1735 | /* | |
1736 | * assume caller has checked sense and determined | |
1737 | * the check condition was retryable. | |
1738 | */ | |
1739 | if (scmd->request->cmd_flags & REQ_FAILFAST_DEV || | |
1740 | scmd->request->cmd_type == REQ_TYPE_BLOCK_PC) | |
1741 | return 1; | |
1742 | else | |
1743 | return 0; | |
4a27446f MC |
1744 | } |
1745 | ||
1da177e4 LT |
1746 | /** |
1747 | * scsi_decide_disposition - Disposition a cmd on return from LLD. | |
1748 | * @scmd: SCSI cmd to examine. | |
1749 | * | |
1750 | * Notes: | |
1751 | * This is *only* called when we are examining the status after sending | |
1752 | * out the actual data command. any commands that are queued for error | |
1753 | * recovery (e.g. test_unit_ready) do *not* come through here. | |
1754 | * | |
1755 | * When this routine returns failed, it means the error handler thread | |
1756 | * is woken. In cases where the error code indicates an error that | |
1757 | * doesn't require the error handler read (i.e. we don't need to | |
1758 | * abort/reset), this function should return SUCCESS. | |
dc8875e1 | 1759 | */ |
1da177e4 LT |
1760 | int scsi_decide_disposition(struct scsi_cmnd *scmd) |
1761 | { | |
1762 | int rtn; | |
1763 | ||
1764 | /* | |
1765 | * if the device is offline, then we clearly just pass the result back | |
1766 | * up to the top level. | |
1767 | */ | |
1768 | if (!scsi_device_online(scmd->device)) { | |
91921e01 HR |
1769 | SCSI_LOG_ERROR_RECOVERY(5, scmd_printk(KERN_INFO, scmd, |
1770 | "%s: device offline - report as SUCCESS\n", __func__)); | |
1da177e4 LT |
1771 | return SUCCESS; |
1772 | } | |
1773 | ||
1774 | /* | |
1775 | * first check the host byte, to see if there is anything in there | |
1776 | * that would indicate what we need to do. | |
1777 | */ | |
1778 | switch (host_byte(scmd->result)) { | |
1779 | case DID_PASSTHROUGH: | |
1780 | /* | |
1781 | * no matter what, pass this through to the upper layer. | |
1782 | * nuke this special code so that it looks like we are saying | |
1783 | * did_ok. | |
1784 | */ | |
1785 | scmd->result &= 0xff00ffff; | |
1786 | return SUCCESS; | |
1787 | case DID_OK: | |
1788 | /* | |
1789 | * looks good. drop through, and check the next byte. | |
1790 | */ | |
1791 | break; | |
e494f6a7 HR |
1792 | case DID_ABORT: |
1793 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) { | |
8922a908 | 1794 | set_host_byte(scmd, DID_TIME_OUT); |
e494f6a7 HR |
1795 | return SUCCESS; |
1796 | } | |
1da177e4 LT |
1797 | case DID_NO_CONNECT: |
1798 | case DID_BAD_TARGET: | |
1da177e4 LT |
1799 | /* |
1800 | * note - this means that we just report the status back | |
1801 | * to the top level driver, not that we actually think | |
1802 | * that it indicates SUCCESS. | |
1803 | */ | |
1804 | return SUCCESS; | |
1805 | /* | |
1806 | * when the low level driver returns did_soft_error, | |
0bf8c869 | 1807 | * it is responsible for keeping an internal retry counter |
1da177e4 LT |
1808 | * in order to avoid endless loops (db) |
1809 | * | |
1810 | * actually this is a bug in this function here. we should | |
1811 | * be mindful of the maximum number of retries specified | |
1812 | * and not get stuck in a loop. | |
1813 | */ | |
1814 | case DID_SOFT_ERROR: | |
1815 | goto maybe_retry; | |
1816 | case DID_IMM_RETRY: | |
1817 | return NEEDS_RETRY; | |
1818 | ||
bf341919 | 1819 | case DID_REQUEUE: |
1820 | return ADD_TO_MLQUEUE; | |
a4dfaa6f MC |
1821 | case DID_TRANSPORT_DISRUPTED: |
1822 | /* | |
1823 | * LLD/transport was disrupted during processing of the IO. | |
1824 | * The transport class is now blocked/blocking, | |
1825 | * and the transport will decide what to do with the IO | |
939c2288 MC |
1826 | * based on its timers and recovery capablilities if |
1827 | * there are enough retries. | |
a4dfaa6f | 1828 | */ |
939c2288 | 1829 | goto maybe_retry; |
a4dfaa6f MC |
1830 | case DID_TRANSPORT_FAILFAST: |
1831 | /* | |
1832 | * The transport decided to failfast the IO (most likely | |
1833 | * the fast io fail tmo fired), so send IO directly upwards. | |
1834 | */ | |
1835 | return SUCCESS; | |
1da177e4 LT |
1836 | case DID_ERROR: |
1837 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1838 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1839 | /* | |
1840 | * execute reservation conflict processing code | |
1841 | * lower down | |
1842 | */ | |
1843 | break; | |
1844 | /* fallthrough */ | |
1da177e4 LT |
1845 | case DID_BUS_BUSY: |
1846 | case DID_PARITY: | |
1847 | goto maybe_retry; | |
1848 | case DID_TIME_OUT: | |
1849 | /* | |
1850 | * when we scan the bus, we get timeout messages for | |
1851 | * these commands if there is no device available. | |
1852 | * other hosts report did_no_connect for the same thing. | |
1853 | */ | |
1854 | if ((scmd->cmnd[0] == TEST_UNIT_READY || | |
1855 | scmd->cmnd[0] == INQUIRY)) { | |
1856 | return SUCCESS; | |
1857 | } else { | |
1858 | return FAILED; | |
1859 | } | |
1860 | case DID_RESET: | |
1861 | return SUCCESS; | |
1862 | default: | |
1863 | return FAILED; | |
1864 | } | |
1865 | ||
1866 | /* | |
1867 | * next, check the message byte. | |
1868 | */ | |
1869 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
1870 | return FAILED; | |
1871 | ||
1872 | /* | |
1873 | * check the status byte to see if this indicates anything special. | |
1874 | */ | |
1875 | switch (status_byte(scmd->result)) { | |
1876 | case QUEUE_FULL: | |
42a6a918 | 1877 | scsi_handle_queue_full(scmd->device); |
1da177e4 LT |
1878 | /* |
1879 | * the case of trying to send too many commands to a | |
1880 | * tagged queueing device. | |
1881 | */ | |
1882 | case BUSY: | |
1883 | /* | |
1884 | * device can't talk to us at the moment. Should only | |
1885 | * occur (SAM-3) when the task queue is empty, so will cause | |
1886 | * the empty queue handling to trigger a stall in the | |
1887 | * device. | |
1888 | */ | |
1889 | return ADD_TO_MLQUEUE; | |
1890 | case GOOD: | |
279afdfe EM |
1891 | if (scmd->cmnd[0] == REPORT_LUNS) |
1892 | scmd->device->sdev_target->expecting_lun_change = 0; | |
4a84067d | 1893 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 | 1894 | case COMMAND_TERMINATED: |
1da177e4 | 1895 | return SUCCESS; |
a9b589d9 VB |
1896 | case TASK_ABORTED: |
1897 | goto maybe_retry; | |
1da177e4 LT |
1898 | case CHECK_CONDITION: |
1899 | rtn = scsi_check_sense(scmd); | |
1900 | if (rtn == NEEDS_RETRY) | |
1901 | goto maybe_retry; | |
1902 | /* if rtn == FAILED, we have no sense information; | |
1903 | * returning FAILED will wake the error handler thread | |
1904 | * to collect the sense and redo the decide | |
1905 | * disposition */ | |
1906 | return rtn; | |
1907 | case CONDITION_GOOD: | |
1908 | case INTERMEDIATE_GOOD: | |
1909 | case INTERMEDIATE_C_GOOD: | |
1910 | case ACA_ACTIVE: | |
1911 | /* | |
1912 | * who knows? FIXME(eric) | |
1913 | */ | |
1914 | return SUCCESS; | |
1915 | ||
1916 | case RESERVATION_CONFLICT: | |
9ccfc756 JB |
1917 | sdev_printk(KERN_INFO, scmd->device, |
1918 | "reservation conflict\n"); | |
2082ebc4 | 1919 | set_host_byte(scmd, DID_NEXUS_FAILURE); |
1da177e4 LT |
1920 | return SUCCESS; /* causes immediate i/o error */ |
1921 | default: | |
1922 | return FAILED; | |
1923 | } | |
1924 | return FAILED; | |
1925 | ||
1926 | maybe_retry: | |
1927 | ||
1928 | /* we requeue for retry because the error was retryable, and | |
1929 | * the request was not marked fast fail. Note that above, | |
1930 | * even if the request is marked fast fail, we still requeue | |
1931 | * for queue congestion conditions (QUEUE_FULL or BUSY) */ | |
8884efab | 1932 | if ((++scmd->retries) <= scmd->allowed |
4a27446f | 1933 | && !scsi_noretry_cmd(scmd)) { |
1da177e4 LT |
1934 | return NEEDS_RETRY; |
1935 | } else { | |
1936 | /* | |
1937 | * no more retries - report this one back to upper level. | |
1938 | */ | |
1939 | return SUCCESS; | |
1940 | } | |
1941 | } | |
1942 | ||
f078727b FT |
1943 | static void eh_lock_door_done(struct request *req, int uptodate) |
1944 | { | |
1945 | __blk_put_request(req->q, req); | |
1946 | } | |
1947 | ||
1da177e4 LT |
1948 | /** |
1949 | * scsi_eh_lock_door - Prevent medium removal for the specified device | |
1950 | * @sdev: SCSI device to prevent medium removal | |
1951 | * | |
1952 | * Locking: | |
91bc31fb | 1953 | * We must be called from process context. |
1da177e4 LT |
1954 | * |
1955 | * Notes: | |
1956 | * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the | |
1957 | * head of the devices request queue, and continue. | |
dc8875e1 | 1958 | */ |
1da177e4 LT |
1959 | static void scsi_eh_lock_door(struct scsi_device *sdev) |
1960 | { | |
f078727b | 1961 | struct request *req; |
1da177e4 | 1962 | |
91bc31fb JB |
1963 | /* |
1964 | * blk_get_request with GFP_KERNEL (__GFP_WAIT) sleeps until a | |
1965 | * request becomes available | |
1966 | */ | |
f078727b | 1967 | req = blk_get_request(sdev->request_queue, READ, GFP_KERNEL); |
a492f075 | 1968 | if (IS_ERR(req)) |
eb571eea | 1969 | return; |
1da177e4 | 1970 | |
f27b087b JA |
1971 | blk_rq_set_block_pc(req); |
1972 | ||
f078727b FT |
1973 | req->cmd[0] = ALLOW_MEDIUM_REMOVAL; |
1974 | req->cmd[1] = 0; | |
1975 | req->cmd[2] = 0; | |
1976 | req->cmd[3] = 0; | |
1977 | req->cmd[4] = SCSI_REMOVAL_PREVENT; | |
1978 | req->cmd[5] = 0; | |
1da177e4 | 1979 | |
f078727b FT |
1980 | req->cmd_len = COMMAND_SIZE(req->cmd[0]); |
1981 | ||
f078727b FT |
1982 | req->cmd_flags |= REQ_QUIET; |
1983 | req->timeout = 10 * HZ; | |
1984 | req->retries = 5; | |
1985 | ||
1986 | blk_execute_rq_nowait(req->q, NULL, req, 1, eh_lock_door_done); | |
1987 | } | |
1da177e4 LT |
1988 | |
1989 | /** | |
1990 | * scsi_restart_operations - restart io operations to the specified host. | |
1991 | * @shost: Host we are restarting. | |
1992 | * | |
1993 | * Notes: | |
1994 | * When we entered the error handler, we blocked all further i/o to | |
1995 | * this device. we need to 'reverse' this process. | |
dc8875e1 | 1996 | */ |
1da177e4 LT |
1997 | static void scsi_restart_operations(struct Scsi_Host *shost) |
1998 | { | |
1999 | struct scsi_device *sdev; | |
939647ee | 2000 | unsigned long flags; |
1da177e4 LT |
2001 | |
2002 | /* | |
2003 | * If the door was locked, we need to insert a door lock request | |
2004 | * onto the head of the SCSI request queue for the device. There | |
2005 | * is no point trying to lock the door of an off-line device. | |
2006 | */ | |
2007 | shost_for_each_device(sdev, shost) { | |
48379270 | 2008 | if (scsi_device_online(sdev) && sdev->was_reset && sdev->locked) { |
1da177e4 | 2009 | scsi_eh_lock_door(sdev); |
48379270 CH |
2010 | sdev->was_reset = 0; |
2011 | } | |
1da177e4 LT |
2012 | } |
2013 | ||
2014 | /* | |
2015 | * next free up anything directly waiting upon the host. this | |
2016 | * will be requests for character device operations, and also for | |
2017 | * ioctls to queued block devices. | |
2018 | */ | |
b4562022 | 2019 | SCSI_LOG_ERROR_RECOVERY(3, |
91921e01 | 2020 | shost_printk(KERN_INFO, shost, "waking up host to restart\n")); |
1da177e4 | 2021 | |
939647ee JB |
2022 | spin_lock_irqsave(shost->host_lock, flags); |
2023 | if (scsi_host_set_state(shost, SHOST_RUNNING)) | |
2024 | if (scsi_host_set_state(shost, SHOST_CANCEL)) | |
2025 | BUG_ON(scsi_host_set_state(shost, SHOST_DEL)); | |
2026 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
2027 | |
2028 | wake_up(&shost->host_wait); | |
2029 | ||
2030 | /* | |
2031 | * finally we need to re-initiate requests that may be pending. we will | |
2032 | * have had everything blocked while error handling is taking place, and | |
2033 | * now that error recovery is done, we will need to ensure that these | |
2034 | * requests are started. | |
2035 | */ | |
2036 | scsi_run_host_queues(shost); | |
57fc2e33 DW |
2037 | |
2038 | /* | |
2039 | * if eh is active and host_eh_scheduled is pending we need to re-run | |
2040 | * recovery. we do this check after scsi_run_host_queues() to allow | |
2041 | * everything pent up since the last eh run a chance to make forward | |
2042 | * progress before we sync again. Either we'll immediately re-run | |
2043 | * recovery or scsi_device_unbusy() will wake us again when these | |
2044 | * pending commands complete. | |
2045 | */ | |
2046 | spin_lock_irqsave(shost->host_lock, flags); | |
2047 | if (shost->host_eh_scheduled) | |
2048 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) | |
2049 | WARN_ON(scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)); | |
2050 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
2051 | } |
2052 | ||
2053 | /** | |
2054 | * scsi_eh_ready_devs - check device ready state and recover if not. | |
74cf298f RD |
2055 | * @shost: host to be recovered. |
2056 | * @work_q: &list_head for pending commands. | |
eb44820c | 2057 | * @done_q: &list_head for processed commands. |
dc8875e1 | 2058 | */ |
dca84e46 DW |
2059 | void scsi_eh_ready_devs(struct Scsi_Host *shost, |
2060 | struct list_head *work_q, | |
2061 | struct list_head *done_q) | |
1da177e4 LT |
2062 | { |
2063 | if (!scsi_eh_stu(shost, work_q, done_q)) | |
2064 | if (!scsi_eh_bus_device_reset(shost, work_q, done_q)) | |
30bd7df8 MC |
2065 | if (!scsi_eh_target_reset(shost, work_q, done_q)) |
2066 | if (!scsi_eh_bus_reset(shost, work_q, done_q)) | |
91921e01 | 2067 | if (!scsi_eh_host_reset(shost, work_q, done_q)) |
30bd7df8 MC |
2068 | scsi_eh_offline_sdevs(work_q, |
2069 | done_q); | |
1da177e4 | 2070 | } |
dca84e46 | 2071 | EXPORT_SYMBOL_GPL(scsi_eh_ready_devs); |
1da177e4 LT |
2072 | |
2073 | /** | |
2074 | * scsi_eh_flush_done_q - finish processed commands or retry them. | |
2075 | * @done_q: list_head of processed commands. | |
dc8875e1 | 2076 | */ |
041c5fc3 | 2077 | void scsi_eh_flush_done_q(struct list_head *done_q) |
1da177e4 | 2078 | { |
937abeaa | 2079 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 2080 | |
937abeaa CH |
2081 | list_for_each_entry_safe(scmd, next, done_q, eh_entry) { |
2082 | list_del_init(&scmd->eh_entry); | |
1da177e4 | 2083 | if (scsi_device_online(scmd->device) && |
4a27446f | 2084 | !scsi_noretry_cmd(scmd) && |
8884efab | 2085 | (++scmd->retries <= scmd->allowed)) { |
91921e01 HR |
2086 | SCSI_LOG_ERROR_RECOVERY(3, |
2087 | scmd_printk(KERN_INFO, scmd, | |
470613b4 HR |
2088 | "%s: flush retry cmd\n", |
2089 | current->comm)); | |
1da177e4 LT |
2090 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); |
2091 | } else { | |
793698ce PM |
2092 | /* |
2093 | * If just we got sense for the device (called | |
2094 | * scsi_eh_get_sense), scmd->result is already | |
2095 | * set, do not set DRIVER_TIMEOUT. | |
2096 | */ | |
1da177e4 LT |
2097 | if (!scmd->result) |
2098 | scmd->result |= (DRIVER_TIMEOUT << 24); | |
91921e01 HR |
2099 | SCSI_LOG_ERROR_RECOVERY(3, |
2100 | scmd_printk(KERN_INFO, scmd, | |
470613b4 HR |
2101 | "%s: flush finish cmd\n", |
2102 | current->comm)); | |
1da177e4 LT |
2103 | scsi_finish_command(scmd); |
2104 | } | |
2105 | } | |
2106 | } | |
041c5fc3 | 2107 | EXPORT_SYMBOL(scsi_eh_flush_done_q); |
1da177e4 LT |
2108 | |
2109 | /** | |
2110 | * scsi_unjam_host - Attempt to fix a host which has a cmd that failed. | |
2111 | * @shost: Host to unjam. | |
2112 | * | |
2113 | * Notes: | |
2114 | * When we come in here, we *know* that all commands on the bus have | |
2115 | * either completed, failed or timed out. we also know that no further | |
2116 | * commands are being sent to the host, so things are relatively quiet | |
2117 | * and we have freedom to fiddle with things as we wish. | |
2118 | * | |
2119 | * This is only the *default* implementation. it is possible for | |
2120 | * individual drivers to supply their own version of this function, and | |
2121 | * if the maintainer wishes to do this, it is strongly suggested that | |
2122 | * this function be taken as a template and modified. this function | |
2123 | * was designed to correctly handle problems for about 95% of the | |
2124 | * different cases out there, and it should always provide at least a | |
2125 | * reasonable amount of error recovery. | |
2126 | * | |
2127 | * Any command marked 'failed' or 'timeout' must eventually have | |
2128 | * scsi_finish_cmd() called for it. we do all of the retry stuff | |
2129 | * here, so when we restart the host after we return it should have an | |
2130 | * empty queue. | |
dc8875e1 | 2131 | */ |
1da177e4 LT |
2132 | static void scsi_unjam_host(struct Scsi_Host *shost) |
2133 | { | |
2134 | unsigned long flags; | |
2135 | LIST_HEAD(eh_work_q); | |
2136 | LIST_HEAD(eh_done_q); | |
2137 | ||
2138 | spin_lock_irqsave(shost->host_lock, flags); | |
2139 | list_splice_init(&shost->eh_cmd_q, &eh_work_q); | |
2140 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2141 | ||
2142 | SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost, &eh_work_q)); | |
2143 | ||
2144 | if (!scsi_eh_get_sense(&eh_work_q, &eh_done_q)) | |
2145 | if (!scsi_eh_abort_cmds(&eh_work_q, &eh_done_q)) | |
2146 | scsi_eh_ready_devs(shost, &eh_work_q, &eh_done_q); | |
2147 | ||
b4562022 | 2148 | spin_lock_irqsave(shost->host_lock, flags); |
bb3b621a | 2149 | if (shost->eh_deadline != -1) |
b4562022 HR |
2150 | shost->last_reset = 0; |
2151 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
2152 | scsi_eh_flush_done_q(&eh_done_q); |
2153 | } | |
2154 | ||
2155 | /** | |
ad42eb1b | 2156 | * scsi_error_handler - SCSI error handler thread |
1da177e4 LT |
2157 | * @data: Host for which we are running. |
2158 | * | |
2159 | * Notes: | |
ad42eb1b CH |
2160 | * This is the main error handling loop. This is run as a kernel thread |
2161 | * for every SCSI host and handles all error handling activity. | |
dc8875e1 | 2162 | */ |
1da177e4 LT |
2163 | int scsi_error_handler(void *data) |
2164 | { | |
ad42eb1b | 2165 | struct Scsi_Host *shost = data; |
1da177e4 | 2166 | |
1da177e4 | 2167 | /* |
ad42eb1b CH |
2168 | * We use TASK_INTERRUPTIBLE so that the thread is not |
2169 | * counted against the load average as a running process. | |
2170 | * We never actually get interrupted because kthread_run | |
c03264a7 | 2171 | * disables signal delivery for the created thread. |
1da177e4 | 2172 | */ |
3ed7a470 | 2173 | while (!kthread_should_stop()) { |
b9d5c6b7 | 2174 | set_current_state(TASK_INTERRUPTIBLE); |
ee7863bc | 2175 | if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) || |
74665016 | 2176 | shost->host_failed != atomic_read(&shost->host_busy)) { |
ad42eb1b | 2177 | SCSI_LOG_ERROR_RECOVERY(1, |
91921e01 HR |
2178 | shost_printk(KERN_INFO, shost, |
2179 | "scsi_eh_%d: sleeping\n", | |
2180 | shost->host_no)); | |
3ed7a470 | 2181 | schedule(); |
3ed7a470 JB |
2182 | continue; |
2183 | } | |
1da177e4 | 2184 | |
3ed7a470 | 2185 | __set_current_state(TASK_RUNNING); |
ad42eb1b | 2186 | SCSI_LOG_ERROR_RECOVERY(1, |
91921e01 HR |
2187 | shost_printk(KERN_INFO, shost, |
2188 | "scsi_eh_%d: waking up %d/%d/%d\n", | |
2189 | shost->host_no, shost->host_eh_scheduled, | |
74665016 CH |
2190 | shost->host_failed, |
2191 | atomic_read(&shost->host_busy))); | |
1da177e4 | 2192 | |
1da177e4 LT |
2193 | /* |
2194 | * We have a host that is failing for some reason. Figure out | |
2195 | * what we need to do to get it up and online again (if we can). | |
2196 | * If we fail, we end up taking the thing offline. | |
2197 | */ | |
ae0751ff | 2198 | if (!shost->eh_noresume && scsi_autopm_get_host(shost) != 0) { |
bc4f2401 | 2199 | SCSI_LOG_ERROR_RECOVERY(1, |
a222b1e2 HR |
2200 | shost_printk(KERN_ERR, shost, |
2201 | "scsi_eh_%d: unable to autoresume\n", | |
2202 | shost->host_no)); | |
bc4f2401 AS |
2203 | continue; |
2204 | } | |
2205 | ||
9227c33d CH |
2206 | if (shost->transportt->eh_strategy_handler) |
2207 | shost->transportt->eh_strategy_handler(shost); | |
1da177e4 LT |
2208 | else |
2209 | scsi_unjam_host(shost); | |
2210 | ||
1da177e4 LT |
2211 | /* |
2212 | * Note - if the above fails completely, the action is to take | |
2213 | * individual devices offline and flush the queue of any | |
2214 | * outstanding requests that may have been pending. When we | |
2215 | * restart, we restart any I/O to any other devices on the bus | |
2216 | * which are still online. | |
2217 | */ | |
2218 | scsi_restart_operations(shost); | |
ae0751ff LM |
2219 | if (!shost->eh_noresume) |
2220 | scsi_autopm_put_host(shost); | |
1da177e4 | 2221 | } |
461a0ffb SR |
2222 | __set_current_state(TASK_RUNNING); |
2223 | ||
ad42eb1b | 2224 | SCSI_LOG_ERROR_RECOVERY(1, |
91921e01 HR |
2225 | shost_printk(KERN_INFO, shost, |
2226 | "Error handler scsi_eh_%d exiting\n", | |
2227 | shost->host_no)); | |
3ed7a470 | 2228 | shost->ehandler = NULL; |
1da177e4 LT |
2229 | return 0; |
2230 | } | |
2231 | ||
2232 | /* | |
2233 | * Function: scsi_report_bus_reset() | |
2234 | * | |
2235 | * Purpose: Utility function used by low-level drivers to report that | |
2236 | * they have observed a bus reset on the bus being handled. | |
2237 | * | |
2238 | * Arguments: shost - Host in question | |
2239 | * channel - channel on which reset was observed. | |
2240 | * | |
2241 | * Returns: Nothing | |
2242 | * | |
2243 | * Lock status: Host lock must be held. | |
2244 | * | |
2245 | * Notes: This only needs to be called if the reset is one which | |
2246 | * originates from an unknown location. Resets originated | |
2247 | * by the mid-level itself don't need to call this, but there | |
2248 | * should be no harm. | |
2249 | * | |
2250 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
2251 | * is properly treated. | |
2252 | */ | |
2253 | void scsi_report_bus_reset(struct Scsi_Host *shost, int channel) | |
2254 | { | |
2255 | struct scsi_device *sdev; | |
2256 | ||
2257 | __shost_for_each_device(sdev, shost) { | |
30bd7df8 MC |
2258 | if (channel == sdev_channel(sdev)) |
2259 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
2260 | } |
2261 | } | |
2262 | EXPORT_SYMBOL(scsi_report_bus_reset); | |
2263 | ||
2264 | /* | |
2265 | * Function: scsi_report_device_reset() | |
2266 | * | |
2267 | * Purpose: Utility function used by low-level drivers to report that | |
2268 | * they have observed a device reset on the device being handled. | |
2269 | * | |
2270 | * Arguments: shost - Host in question | |
2271 | * channel - channel on which reset was observed | |
2272 | * target - target on which reset was observed | |
2273 | * | |
2274 | * Returns: Nothing | |
2275 | * | |
2276 | * Lock status: Host lock must be held | |
2277 | * | |
2278 | * Notes: This only needs to be called if the reset is one which | |
2279 | * originates from an unknown location. Resets originated | |
2280 | * by the mid-level itself don't need to call this, but there | |
2281 | * should be no harm. | |
2282 | * | |
2283 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
2284 | * is properly treated. | |
2285 | */ | |
2286 | void scsi_report_device_reset(struct Scsi_Host *shost, int channel, int target) | |
2287 | { | |
2288 | struct scsi_device *sdev; | |
2289 | ||
2290 | __shost_for_each_device(sdev, shost) { | |
422c0d61 | 2291 | if (channel == sdev_channel(sdev) && |
30bd7df8 MC |
2292 | target == sdev_id(sdev)) |
2293 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
2294 | } |
2295 | } | |
2296 | EXPORT_SYMBOL(scsi_report_device_reset); | |
2297 | ||
2298 | static void | |
2299 | scsi_reset_provider_done_command(struct scsi_cmnd *scmd) | |
2300 | { | |
2301 | } | |
2302 | ||
176aa9d6 CH |
2303 | /** |
2304 | * scsi_ioctl_reset: explicitly reset a host/bus/target/device | |
2305 | * @dev: scsi_device to operate on | |
2306 | * @arg: reset type (see sg.h) | |
1da177e4 LT |
2307 | */ |
2308 | int | |
176aa9d6 | 2309 | scsi_ioctl_reset(struct scsi_device *dev, int __user *arg) |
1da177e4 | 2310 | { |
bc4f2401 | 2311 | struct scsi_cmnd *scmd; |
d7a1bb0a | 2312 | struct Scsi_Host *shost = dev->host; |
1da177e4 | 2313 | struct request req; |
d7a1bb0a | 2314 | unsigned long flags; |
176aa9d6 CH |
2315 | int error = 0, rtn, val; |
2316 | ||
2317 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2318 | return -EACCES; | |
2319 | ||
2320 | error = get_user(val, arg); | |
2321 | if (error) | |
2322 | return error; | |
1da177e4 | 2323 | |
bc4f2401 | 2324 | if (scsi_autopm_get_host(shost) < 0) |
176aa9d6 | 2325 | return -EIO; |
bc4f2401 | 2326 | |
176aa9d6 | 2327 | error = -EIO; |
bc4f2401 | 2328 | scmd = scsi_get_command(dev, GFP_KERNEL); |
0f121dd8 | 2329 | if (!scmd) |
95eeb5f5 | 2330 | goto out_put_autopm_host; |
95eeb5f5 | 2331 | |
4f54eec8 | 2332 | blk_rq_init(NULL, &req); |
1da177e4 | 2333 | scmd->request = &req; |
b4edcbca | 2334 | |
64a87b24 BH |
2335 | scmd->cmnd = req.cmd; |
2336 | ||
1da177e4 | 2337 | scmd->scsi_done = scsi_reset_provider_done_command; |
30b0c37b | 2338 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
1da177e4 LT |
2339 | |
2340 | scmd->cmd_len = 0; | |
2341 | ||
2342 | scmd->sc_data_direction = DMA_BIDIRECTIONAL; | |
1da177e4 | 2343 | |
d7a1bb0a JS |
2344 | spin_lock_irqsave(shost->host_lock, flags); |
2345 | shost->tmf_in_progress = 1; | |
2346 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2347 | ||
176aa9d6 CH |
2348 | switch (val & ~SG_SCSI_RESET_NO_ESCALATE) { |
2349 | case SG_SCSI_RESET_NOTHING: | |
2350 | rtn = SUCCESS; | |
2351 | break; | |
2352 | case SG_SCSI_RESET_DEVICE: | |
1da177e4 | 2353 | rtn = scsi_try_bus_device_reset(scmd); |
176aa9d6 | 2354 | if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE)) |
1da177e4 LT |
2355 | break; |
2356 | /* FALLTHROUGH */ | |
176aa9d6 | 2357 | case SG_SCSI_RESET_TARGET: |
30bd7df8 | 2358 | rtn = scsi_try_target_reset(scmd); |
176aa9d6 | 2359 | if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE)) |
30bd7df8 MC |
2360 | break; |
2361 | /* FALLTHROUGH */ | |
176aa9d6 | 2362 | case SG_SCSI_RESET_BUS: |
1da177e4 | 2363 | rtn = scsi_try_bus_reset(scmd); |
176aa9d6 | 2364 | if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE)) |
1da177e4 LT |
2365 | break; |
2366 | /* FALLTHROUGH */ | |
176aa9d6 | 2367 | case SG_SCSI_RESET_HOST: |
1da177e4 | 2368 | rtn = scsi_try_host_reset(scmd); |
176aa9d6 CH |
2369 | if (rtn == SUCCESS) |
2370 | break; | |
1da177e4 | 2371 | default: |
176aa9d6 | 2372 | /* FALLTHROUGH */ |
1da177e4 | 2373 | rtn = FAILED; |
176aa9d6 | 2374 | break; |
1da177e4 LT |
2375 | } |
2376 | ||
176aa9d6 CH |
2377 | error = (rtn == SUCCESS) ? 0 : -EIO; |
2378 | ||
d7a1bb0a JS |
2379 | spin_lock_irqsave(shost->host_lock, flags); |
2380 | shost->tmf_in_progress = 0; | |
2381 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2382 | ||
2383 | /* | |
2384 | * be sure to wake up anyone who was sleeping or had their queue | |
2385 | * suspended while we performed the TMF. | |
2386 | */ | |
2387 | SCSI_LOG_ERROR_RECOVERY(3, | |
91921e01 HR |
2388 | shost_printk(KERN_INFO, shost, |
2389 | "waking up host to restart after TMF\n")); | |
d7a1bb0a JS |
2390 | |
2391 | wake_up(&shost->host_wait); | |
d7a1bb0a JS |
2392 | scsi_run_host_queues(shost); |
2393 | ||
0f121dd8 CH |
2394 | scsi_put_command(scmd); |
2395 | ||
04796336 | 2396 | out_put_autopm_host: |
bc4f2401 | 2397 | scsi_autopm_put_host(shost); |
176aa9d6 | 2398 | return error; |
1da177e4 | 2399 | } |
176aa9d6 | 2400 | EXPORT_SYMBOL(scsi_ioctl_reset); |
1da177e4 | 2401 | |
4753cbc0 HR |
2402 | bool scsi_command_normalize_sense(const struct scsi_cmnd *cmd, |
2403 | struct scsi_sense_hdr *sshdr) | |
1da177e4 LT |
2404 | { |
2405 | return scsi_normalize_sense(cmd->sense_buffer, | |
b80ca4f7 | 2406 | SCSI_SENSE_BUFFERSIZE, sshdr); |
1da177e4 LT |
2407 | } |
2408 | EXPORT_SYMBOL(scsi_command_normalize_sense); | |
2409 | ||
2410 | /** | |
eb44820c | 2411 | * scsi_sense_desc_find - search for a given descriptor type in descriptor sense data format. |
1da177e4 LT |
2412 | * @sense_buffer: byte array of descriptor format sense data |
2413 | * @sb_len: number of valid bytes in sense_buffer | |
2414 | * @desc_type: value of descriptor type to find | |
2415 | * (e.g. 0 -> information) | |
2416 | * | |
2417 | * Notes: | |
2418 | * only valid when sense data is in descriptor format | |
2419 | * | |
2420 | * Return value: | |
2421 | * pointer to start of (first) descriptor if found else NULL | |
dc8875e1 | 2422 | */ |
1da177e4 LT |
2423 | const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len, |
2424 | int desc_type) | |
2425 | { | |
2426 | int add_sen_len, add_len, desc_len, k; | |
2427 | const u8 * descp; | |
2428 | ||
2429 | if ((sb_len < 8) || (0 == (add_sen_len = sense_buffer[7]))) | |
2430 | return NULL; | |
2431 | if ((sense_buffer[0] < 0x72) || (sense_buffer[0] > 0x73)) | |
2432 | return NULL; | |
2433 | add_sen_len = (add_sen_len < (sb_len - 8)) ? | |
2434 | add_sen_len : (sb_len - 8); | |
2435 | descp = &sense_buffer[8]; | |
2436 | for (desc_len = 0, k = 0; k < add_sen_len; k += desc_len) { | |
2437 | descp += desc_len; | |
2438 | add_len = (k < (add_sen_len - 1)) ? descp[1]: -1; | |
2439 | desc_len = add_len + 2; | |
2440 | if (descp[0] == desc_type) | |
2441 | return descp; | |
2442 | if (add_len < 0) // short descriptor ?? | |
2443 | break; | |
2444 | } | |
2445 | return NULL; | |
2446 | } | |
2447 | EXPORT_SYMBOL(scsi_sense_desc_find); | |
2448 | ||
2449 | /** | |
eb44820c | 2450 | * scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor format) |
1da177e4 LT |
2451 | * @sense_buffer: byte array of sense data |
2452 | * @sb_len: number of valid bytes in sense_buffer | |
2453 | * @info_out: pointer to 64 integer where 8 or 4 byte information | |
2454 | * field will be placed if found. | |
2455 | * | |
2456 | * Return value: | |
2457 | * 1 if information field found, 0 if not found. | |
dc8875e1 | 2458 | */ |
1da177e4 LT |
2459 | int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len, |
2460 | u64 * info_out) | |
2461 | { | |
2462 | int j; | |
2463 | const u8 * ucp; | |
2464 | u64 ull; | |
2465 | ||
2466 | if (sb_len < 7) | |
2467 | return 0; | |
2468 | switch (sense_buffer[0] & 0x7f) { | |
2469 | case 0x70: | |
2470 | case 0x71: | |
2471 | if (sense_buffer[0] & 0x80) { | |
2472 | *info_out = (sense_buffer[3] << 24) + | |
2473 | (sense_buffer[4] << 16) + | |
2474 | (sense_buffer[5] << 8) + sense_buffer[6]; | |
2475 | return 1; | |
2476 | } else | |
2477 | return 0; | |
2478 | case 0x72: | |
2479 | case 0x73: | |
2480 | ucp = scsi_sense_desc_find(sense_buffer, sb_len, | |
2481 | 0 /* info desc */); | |
2482 | if (ucp && (0xa == ucp[1])) { | |
2483 | ull = 0; | |
2484 | for (j = 0; j < 8; ++j) { | |
2485 | if (j > 0) | |
2486 | ull <<= 8; | |
2487 | ull |= ucp[4 + j]; | |
2488 | } | |
2489 | *info_out = ull; | |
2490 | return 1; | |
2491 | } else | |
2492 | return 0; | |
2493 | default: | |
2494 | return 0; | |
2495 | } | |
2496 | } | |
2497 | EXPORT_SYMBOL(scsi_get_sense_info_fld); | |
3bc6a261 FT |
2498 | |
2499 | /** | |
2500 | * scsi_build_sense_buffer - build sense data in a buffer | |
2501 | * @desc: Sense format (non zero == descriptor format, | |
2502 | * 0 == fixed format) | |
2503 | * @buf: Where to build sense data | |
2504 | * @key: Sense key | |
2505 | * @asc: Additional sense code | |
2506 | * @ascq: Additional sense code qualifier | |
2507 | * | |
2508 | **/ | |
2509 | void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq) | |
2510 | { | |
2511 | if (desc) { | |
2512 | buf[0] = 0x72; /* descriptor, current */ | |
2513 | buf[1] = key; | |
2514 | buf[2] = asc; | |
2515 | buf[3] = ascq; | |
2516 | buf[7] = 0; | |
2517 | } else { | |
2518 | buf[0] = 0x70; /* fixed, current */ | |
2519 | buf[2] = key; | |
2520 | buf[7] = 0xa; | |
2521 | buf[12] = asc; | |
2522 | buf[13] = ascq; | |
2523 | } | |
2524 | } | |
2525 | EXPORT_SYMBOL(scsi_build_sense_buffer); | |
a1524f22 HR |
2526 | |
2527 | /** | |
2528 | * scsi_set_sense_information - set the information field in a | |
2529 | * formatted sense data buffer | |
2530 | * @buf: Where to build sense data | |
2531 | * @info: 64-bit information value to be set | |
2532 | * | |
2533 | **/ | |
2534 | void scsi_set_sense_information(u8 *buf, u64 info) | |
2535 | { | |
2536 | if ((buf[0] & 0x7f) == 0x72) { | |
2537 | u8 *ucp, len; | |
2538 | ||
2539 | len = buf[7]; | |
2540 | ucp = (char *)scsi_sense_desc_find(buf, len + 8, 0); | |
2541 | if (!ucp) { | |
2542 | buf[7] = len + 0xa; | |
2543 | ucp = buf + 8 + len; | |
2544 | } | |
2545 | ucp[0] = 0; | |
2546 | ucp[1] = 0xa; | |
2547 | ucp[2] = 0x80; /* Valid bit */ | |
2548 | ucp[3] = 0; | |
2549 | put_unaligned_be64(info, &ucp[4]); | |
2550 | } else if ((buf[0] & 0x7f) == 0x70) { | |
2551 | buf[0] |= 0x80; | |
2552 | put_unaligned_be64(info, &buf[3]); | |
2553 | } | |
2554 | } | |
2555 | EXPORT_SYMBOL(scsi_set_sense_information); |