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> |
1da177e4 LT |
29 | |
30 | #include <scsi/scsi.h> | |
beb40487 | 31 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
32 | #include <scsi/scsi_dbg.h> |
33 | #include <scsi/scsi_device.h> | |
18a4d0a2 | 34 | #include <scsi/scsi_driver.h> |
1da177e4 | 35 | #include <scsi/scsi_eh.h> |
c829c394 | 36 | #include <scsi/scsi_transport.h> |
1da177e4 LT |
37 | #include <scsi/scsi_host.h> |
38 | #include <scsi/scsi_ioctl.h> | |
1da177e4 LT |
39 | |
40 | #include "scsi_priv.h" | |
41 | #include "scsi_logging.h" | |
79ee8304 | 42 | #include "scsi_transport_api.h" |
1da177e4 | 43 | |
bf816235 KT |
44 | #include <trace/events/scsi.h> |
45 | ||
14216561 JB |
46 | static void scsi_eh_done(struct scsi_cmnd *scmd); |
47 | ||
1da177e4 LT |
48 | /* |
49 | * These should *probably* be handled by the host itself. | |
50 | * Since it is allowed to sleep, it probably should. | |
51 | */ | |
52 | #define BUS_RESET_SETTLE_TIME (10) | |
53 | #define HOST_RESET_SETTLE_TIME (10) | |
54 | ||
3eef6257 | 55 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd); |
e494f6a7 HR |
56 | static int scsi_try_to_abort_cmd(struct scsi_host_template *, |
57 | struct scsi_cmnd *); | |
3eef6257 | 58 | |
1da177e4 LT |
59 | /* called with shost->host_lock held */ |
60 | void scsi_eh_wakeup(struct Scsi_Host *shost) | |
61 | { | |
62 | if (shost->host_busy == shost->host_failed) { | |
bf816235 | 63 | trace_scsi_eh_wakeup(shost); |
3ed7a470 | 64 | wake_up_process(shost->ehandler); |
1da177e4 LT |
65 | SCSI_LOG_ERROR_RECOVERY(5, |
66 | printk("Waking error handler thread\n")); | |
67 | } | |
68 | } | |
f8bbfc24 TH |
69 | |
70 | /** | |
71 | * scsi_schedule_eh - schedule EH for SCSI host | |
72 | * @shost: SCSI host to invoke error handling on. | |
73 | * | |
74 | * Schedule SCSI EH without scmd. | |
dc8875e1 | 75 | */ |
f8bbfc24 TH |
76 | void scsi_schedule_eh(struct Scsi_Host *shost) |
77 | { | |
78 | unsigned long flags; | |
79 | ||
80 | spin_lock_irqsave(shost->host_lock, flags); | |
81 | ||
82 | if (scsi_host_set_state(shost, SHOST_RECOVERY) == 0 || | |
83 | scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY) == 0) { | |
84 | shost->host_eh_scheduled++; | |
85 | scsi_eh_wakeup(shost); | |
86 | } | |
87 | ||
88 | spin_unlock_irqrestore(shost->host_lock, flags); | |
89 | } | |
90 | EXPORT_SYMBOL_GPL(scsi_schedule_eh); | |
1da177e4 | 91 | |
b4562022 HR |
92 | static int scsi_host_eh_past_deadline(struct Scsi_Host *shost) |
93 | { | |
bb3b621a | 94 | if (!shost->last_reset || shost->eh_deadline == -1) |
b4562022 HR |
95 | return 0; |
96 | ||
76ad3e59 HR |
97 | /* |
98 | * 32bit accesses are guaranteed to be atomic | |
99 | * (on all supported architectures), so instead | |
100 | * of using a spinlock we can as well double check | |
bb3b621a | 101 | * if eh_deadline has been set to 'off' during the |
76ad3e59 HR |
102 | * time_before call. |
103 | */ | |
104 | if (time_before(jiffies, shost->last_reset + shost->eh_deadline) && | |
bb3b621a | 105 | shost->eh_deadline > -1) |
b4562022 HR |
106 | return 0; |
107 | ||
108 | return 1; | |
109 | } | |
110 | ||
e494f6a7 HR |
111 | /** |
112 | * scmd_eh_abort_handler - Handle command aborts | |
113 | * @work: command to be aborted. | |
114 | */ | |
115 | void | |
116 | scmd_eh_abort_handler(struct work_struct *work) | |
117 | { | |
118 | struct scsi_cmnd *scmd = | |
119 | container_of(work, struct scsi_cmnd, abort_work.work); | |
120 | struct scsi_device *sdev = scmd->device; | |
e494f6a7 HR |
121 | int rtn; |
122 | ||
e494f6a7 | 123 | if (scsi_host_eh_past_deadline(sdev->host)) { |
e494f6a7 HR |
124 | SCSI_LOG_ERROR_RECOVERY(3, |
125 | scmd_printk(KERN_INFO, scmd, | |
126 | "scmd %p eh timeout, not aborting\n", | |
127 | scmd)); | |
128 | } else { | |
e494f6a7 HR |
129 | SCSI_LOG_ERROR_RECOVERY(3, |
130 | scmd_printk(KERN_INFO, scmd, | |
131 | "aborting command %p\n", scmd)); | |
132 | rtn = scsi_try_to_abort_cmd(sdev->host->hostt, scmd); | |
133 | if (rtn == SUCCESS) { | |
134 | scmd->result |= DID_TIME_OUT << 16; | |
bb3b621a RM |
135 | if (scsi_host_eh_past_deadline(sdev->host)) { |
136 | SCSI_LOG_ERROR_RECOVERY(3, | |
137 | scmd_printk(KERN_INFO, scmd, | |
138 | "scmd %p eh timeout, " | |
139 | "not retrying aborted " | |
140 | "command\n", scmd)); | |
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, | |
145 | "scmd %p retry " | |
146 | "aborted command\n", scmd)); | |
147 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); | |
bb3b621a | 148 | return; |
e494f6a7 HR |
149 | } else { |
150 | SCSI_LOG_ERROR_RECOVERY(3, | |
151 | scmd_printk(KERN_WARNING, scmd, | |
152 | "scmd %p finish " | |
153 | "aborted command\n", scmd)); | |
154 | scsi_finish_command(scmd); | |
bb3b621a | 155 | return; |
e494f6a7 | 156 | } |
bb3b621a RM |
157 | } else { |
158 | SCSI_LOG_ERROR_RECOVERY(3, | |
159 | scmd_printk(KERN_INFO, scmd, | |
160 | "scmd %p abort failed, rtn %d\n", | |
161 | scmd, rtn)); | |
e494f6a7 | 162 | } |
e494f6a7 HR |
163 | } |
164 | ||
165 | if (!scsi_eh_scmd_add(scmd, 0)) { | |
166 | SCSI_LOG_ERROR_RECOVERY(3, | |
167 | scmd_printk(KERN_WARNING, scmd, | |
168 | "scmd %p terminate " | |
169 | "aborted command\n", scmd)); | |
170 | scmd->result |= DID_TIME_OUT << 16; | |
171 | scsi_finish_command(scmd); | |
172 | } | |
173 | } | |
174 | ||
175 | /** | |
176 | * scsi_abort_command - schedule a command abort | |
177 | * @scmd: scmd to abort. | |
178 | * | |
179 | * We only need to abort commands after a command timeout | |
180 | */ | |
181 | static int | |
182 | scsi_abort_command(struct scsi_cmnd *scmd) | |
183 | { | |
184 | struct scsi_device *sdev = scmd->device; | |
185 | struct Scsi_Host *shost = sdev->host; | |
186 | unsigned long flags; | |
187 | ||
188 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) { | |
189 | /* | |
190 | * Retry after abort failed, escalate to next level. | |
191 | */ | |
7daf4804 | 192 | scmd->eh_eflags &= ~SCSI_EH_ABORT_SCHEDULED; |
e494f6a7 HR |
193 | SCSI_LOG_ERROR_RECOVERY(3, |
194 | scmd_printk(KERN_INFO, scmd, | |
195 | "scmd %p previous abort failed\n", scmd)); | |
196 | cancel_delayed_work(&scmd->abort_work); | |
197 | return FAILED; | |
198 | } | |
199 | ||
200 | /* | |
201 | * Do not try a command abort if | |
202 | * SCSI EH has already started. | |
203 | */ | |
204 | spin_lock_irqsave(shost->host_lock, flags); | |
205 | if (scsi_host_in_recovery(shost)) { | |
206 | spin_unlock_irqrestore(shost->host_lock, flags); | |
207 | SCSI_LOG_ERROR_RECOVERY(3, | |
208 | scmd_printk(KERN_INFO, scmd, | |
209 | "scmd %p not aborting, host in recovery\n", | |
210 | scmd)); | |
211 | return FAILED; | |
212 | } | |
213 | ||
bb3b621a | 214 | if (shost->eh_deadline != -1 && !shost->last_reset) |
e494f6a7 HR |
215 | shost->last_reset = jiffies; |
216 | spin_unlock_irqrestore(shost->host_lock, flags); | |
217 | ||
218 | scmd->eh_eflags |= SCSI_EH_ABORT_SCHEDULED; | |
219 | SCSI_LOG_ERROR_RECOVERY(3, | |
220 | scmd_printk(KERN_INFO, scmd, | |
221 | "scmd %p abort scheduled\n", scmd)); | |
222 | queue_delayed_work(shost->tmf_work_q, &scmd->abort_work, HZ / 100); | |
223 | return SUCCESS; | |
224 | } | |
225 | ||
1da177e4 LT |
226 | /** |
227 | * scsi_eh_scmd_add - add scsi cmd to error handling. | |
228 | * @scmd: scmd to run eh on. | |
229 | * @eh_flag: optional SCSI_EH flag. | |
230 | * | |
231 | * Return value: | |
232 | * 0 on failure. | |
dc8875e1 | 233 | */ |
1da177e4 LT |
234 | int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag) |
235 | { | |
236 | struct Scsi_Host *shost = scmd->device->host; | |
237 | unsigned long flags; | |
939647ee | 238 | int ret = 0; |
1da177e4 | 239 | |
3ed7a470 | 240 | if (!shost->ehandler) |
1da177e4 LT |
241 | return 0; |
242 | ||
243 | spin_lock_irqsave(shost->host_lock, flags); | |
939647ee JB |
244 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) |
245 | if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) | |
246 | goto out_unlock; | |
1da177e4 | 247 | |
bb3b621a | 248 | if (shost->eh_deadline != -1 && !shost->last_reset) |
b4562022 HR |
249 | shost->last_reset = jiffies; |
250 | ||
939647ee | 251 | ret = 1; |
e494f6a7 HR |
252 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) |
253 | eh_flag &= ~SCSI_EH_CANCEL_CMD; | |
3111b0d1 | 254 | scmd->eh_eflags |= eh_flag; |
1da177e4 | 255 | list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q); |
1da177e4 LT |
256 | shost->host_failed++; |
257 | scsi_eh_wakeup(shost); | |
939647ee | 258 | out_unlock: |
1da177e4 | 259 | spin_unlock_irqrestore(shost->host_lock, flags); |
939647ee | 260 | return ret; |
1da177e4 LT |
261 | } |
262 | ||
1da177e4 LT |
263 | /** |
264 | * scsi_times_out - Timeout function for normal scsi commands. | |
242f9dcb | 265 | * @req: request that is timing out. |
1da177e4 LT |
266 | * |
267 | * Notes: | |
268 | * We do not need to lock this. There is the potential for a race | |
269 | * only in that the normal completion handling might run, but if the | |
270 | * normal completion function determines that the timer has already | |
271 | * fired, then it mustn't do anything. | |
dc8875e1 | 272 | */ |
242f9dcb | 273 | enum blk_eh_timer_return scsi_times_out(struct request *req) |
1da177e4 | 274 | { |
242f9dcb | 275 | struct scsi_cmnd *scmd = req->special; |
242f9dcb | 276 | enum blk_eh_timer_return rtn = BLK_EH_NOT_HANDLED; |
0bf8c869 | 277 | struct Scsi_Host *host = scmd->device->host; |
6c5f8ce1 | 278 | |
bf816235 | 279 | trace_scsi_dispatch_cmd_timeout(scmd); |
1da177e4 LT |
280 | scsi_log_completion(scmd, TIMEOUT_ERROR); |
281 | ||
bb3b621a | 282 | if (host->eh_deadline != -1 && !host->last_reset) |
b4562022 HR |
283 | host->last_reset = jiffies; |
284 | ||
0bf8c869 JJ |
285 | if (host->transportt->eh_timed_out) |
286 | rtn = host->transportt->eh_timed_out(scmd); | |
287 | else if (host->hostt->eh_timed_out) | |
288 | rtn = host->hostt->eh_timed_out(scmd); | |
1da177e4 | 289 | |
e494f6a7 HR |
290 | if (rtn == BLK_EH_NOT_HANDLED && !host->hostt->no_async_abort) |
291 | if (scsi_abort_command(scmd) == SUCCESS) | |
292 | return BLK_EH_NOT_HANDLED; | |
293 | ||
18a4d0a2 MP |
294 | scmd->result |= DID_TIME_OUT << 16; |
295 | ||
fa990781 | 296 | if (unlikely(rtn == BLK_EH_NOT_HANDLED && |
18a4d0a2 | 297 | !scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD))) |
fa990781 | 298 | rtn = BLK_EH_HANDLED; |
242f9dcb | 299 | |
fa990781 | 300 | return rtn; |
1da177e4 LT |
301 | } |
302 | ||
303 | /** | |
304 | * scsi_block_when_processing_errors - Prevent cmds from being queued. | |
305 | * @sdev: Device on which we are performing recovery. | |
306 | * | |
307 | * Description: | |
308 | * We block until the host is out of error recovery, and then check to | |
309 | * see whether the host or the device is offline. | |
310 | * | |
311 | * Return value: | |
312 | * 0 when dev was taken offline by error recovery. 1 OK to proceed. | |
dc8875e1 | 313 | */ |
1da177e4 LT |
314 | int scsi_block_when_processing_errors(struct scsi_device *sdev) |
315 | { | |
316 | int online; | |
317 | ||
939647ee | 318 | wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host)); |
1da177e4 LT |
319 | |
320 | online = scsi_device_online(sdev); | |
321 | ||
cadbd4a5 | 322 | SCSI_LOG_ERROR_RECOVERY(5, printk("%s: rtn: %d\n", __func__, |
1da177e4 LT |
323 | online)); |
324 | ||
325 | return online; | |
326 | } | |
327 | EXPORT_SYMBOL(scsi_block_when_processing_errors); | |
328 | ||
329 | #ifdef CONFIG_SCSI_LOGGING | |
330 | /** | |
331 | * scsi_eh_prt_fail_stats - Log info on failures. | |
332 | * @shost: scsi host being recovered. | |
333 | * @work_q: Queue of scsi cmds to process. | |
dc8875e1 | 334 | */ |
1da177e4 LT |
335 | static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost, |
336 | struct list_head *work_q) | |
337 | { | |
338 | struct scsi_cmnd *scmd; | |
339 | struct scsi_device *sdev; | |
340 | int total_failures = 0; | |
341 | int cmd_failed = 0; | |
342 | int cmd_cancel = 0; | |
343 | int devices_failed = 0; | |
344 | ||
345 | shost_for_each_device(sdev, shost) { | |
346 | list_for_each_entry(scmd, work_q, eh_entry) { | |
347 | if (scmd->device == sdev) { | |
348 | ++total_failures; | |
3111b0d1 | 349 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) |
1da177e4 | 350 | ++cmd_cancel; |
0bf8c869 | 351 | else |
1da177e4 LT |
352 | ++cmd_failed; |
353 | } | |
354 | } | |
355 | ||
356 | if (cmd_cancel || cmd_failed) { | |
357 | SCSI_LOG_ERROR_RECOVERY(3, | |
9ccfc756 JB |
358 | sdev_printk(KERN_INFO, sdev, |
359 | "%s: cmds failed: %d, cancel: %d\n", | |
cadbd4a5 | 360 | __func__, cmd_failed, |
9ccfc756 | 361 | cmd_cancel)); |
1da177e4 LT |
362 | cmd_cancel = 0; |
363 | cmd_failed = 0; | |
364 | ++devices_failed; | |
365 | } | |
366 | } | |
367 | ||
368 | SCSI_LOG_ERROR_RECOVERY(2, printk("Total of %d commands on %d" | |
369 | " devices require eh work\n", | |
0bf8c869 | 370 | total_failures, devices_failed)); |
1da177e4 LT |
371 | } |
372 | #endif | |
373 | ||
279afdfe EM |
374 | /** |
375 | * scsi_report_lun_change - Set flag on all *other* devices on the same target | |
376 | * to indicate that a UNIT ATTENTION is expected. | |
377 | * @sdev: Device reporting the UNIT ATTENTION | |
378 | */ | |
379 | static void scsi_report_lun_change(struct scsi_device *sdev) | |
380 | { | |
381 | sdev->sdev_target->expecting_lun_change = 1; | |
382 | } | |
383 | ||
384 | /** | |
385 | * scsi_report_sense - Examine scsi sense information and log messages for | |
386 | * certain conditions, also issue uevents for some of them. | |
387 | * @sdev: Device reporting the sense code | |
388 | * @sshdr: sshdr to be examined | |
389 | */ | |
390 | static void scsi_report_sense(struct scsi_device *sdev, | |
391 | struct scsi_sense_hdr *sshdr) | |
392 | { | |
393 | enum scsi_device_event evt_type = SDEV_EVT_MAXBITS; /* i.e. none */ | |
394 | ||
395 | if (sshdr->sense_key == UNIT_ATTENTION) { | |
396 | if (sshdr->asc == 0x3f && sshdr->ascq == 0x03) { | |
397 | evt_type = SDEV_EVT_INQUIRY_CHANGE_REPORTED; | |
398 | sdev_printk(KERN_WARNING, sdev, | |
399 | "Inquiry data has changed"); | |
400 | } else if (sshdr->asc == 0x3f && sshdr->ascq == 0x0e) { | |
401 | evt_type = SDEV_EVT_LUN_CHANGE_REPORTED; | |
402 | scsi_report_lun_change(sdev); | |
403 | sdev_printk(KERN_WARNING, sdev, | |
404 | "Warning! Received an indication that the " | |
405 | "LUN assignments on this target have " | |
406 | "changed. The Linux SCSI layer does not " | |
407 | "automatically remap LUN assignments.\n"); | |
408 | } else if (sshdr->asc == 0x3f) | |
409 | sdev_printk(KERN_WARNING, sdev, | |
410 | "Warning! Received an indication that the " | |
411 | "operating parameters on this target have " | |
412 | "changed. The Linux SCSI layer does not " | |
413 | "automatically adjust these parameters.\n"); | |
414 | ||
415 | if (sshdr->asc == 0x38 && sshdr->ascq == 0x07) { | |
416 | evt_type = SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED; | |
417 | sdev_printk(KERN_WARNING, sdev, | |
418 | "Warning! Received an indication that the " | |
419 | "LUN reached a thin provisioning soft " | |
420 | "threshold.\n"); | |
421 | } | |
422 | ||
423 | if (sshdr->asc == 0x2a && sshdr->ascq == 0x01) { | |
424 | evt_type = SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED; | |
425 | sdev_printk(KERN_WARNING, sdev, | |
426 | "Mode parameters changed"); | |
427 | } else if (sshdr->asc == 0x2a && sshdr->ascq == 0x09) { | |
428 | evt_type = SDEV_EVT_CAPACITY_CHANGE_REPORTED; | |
429 | sdev_printk(KERN_WARNING, sdev, | |
430 | "Capacity data has changed"); | |
431 | } else if (sshdr->asc == 0x2a) | |
432 | sdev_printk(KERN_WARNING, sdev, | |
433 | "Parameters changed"); | |
434 | } | |
435 | ||
436 | if (evt_type != SDEV_EVT_MAXBITS) { | |
437 | set_bit(evt_type, sdev->pending_events); | |
438 | schedule_work(&sdev->event_work); | |
439 | } | |
440 | } | |
441 | ||
1da177e4 LT |
442 | /** |
443 | * scsi_check_sense - Examine scsi cmd sense | |
444 | * @scmd: Cmd to have sense checked. | |
445 | * | |
446 | * Return value: | |
87f14e65 | 447 | * SUCCESS or FAILED or NEEDS_RETRY or ADD_TO_MLQUEUE |
1da177e4 LT |
448 | * |
449 | * Notes: | |
450 | * When a deferred error is detected the current command has | |
451 | * not been executed and needs retrying. | |
dc8875e1 | 452 | */ |
1da177e4 LT |
453 | static int scsi_check_sense(struct scsi_cmnd *scmd) |
454 | { | |
a6a8d9f8 | 455 | struct scsi_device *sdev = scmd->device; |
1da177e4 LT |
456 | struct scsi_sense_hdr sshdr; |
457 | ||
458 | if (! scsi_command_normalize_sense(scmd, &sshdr)) | |
459 | return FAILED; /* no valid sense data */ | |
460 | ||
14216561 JB |
461 | if (scmd->cmnd[0] == TEST_UNIT_READY && scmd->scsi_done != scsi_eh_done) |
462 | /* | |
463 | * nasty: for mid-layer issued TURs, we need to return the | |
464 | * actual sense data without any recovery attempt. For eh | |
465 | * issued ones, we need to try to recover and interpret | |
466 | */ | |
467 | return SUCCESS; | |
468 | ||
279afdfe EM |
469 | scsi_report_sense(sdev, &sshdr); |
470 | ||
1da177e4 LT |
471 | if (scsi_sense_is_deferred(&sshdr)) |
472 | return NEEDS_RETRY; | |
473 | ||
a6a8d9f8 CS |
474 | if (sdev->scsi_dh_data && sdev->scsi_dh_data->scsi_dh && |
475 | sdev->scsi_dh_data->scsi_dh->check_sense) { | |
476 | int rc; | |
477 | ||
478 | rc = sdev->scsi_dh_data->scsi_dh->check_sense(sdev, &sshdr); | |
479 | if (rc != SCSI_RETURN_NOT_HANDLED) | |
480 | return rc; | |
481 | /* handler does not care. Drop down to default handling */ | |
482 | } | |
483 | ||
1da177e4 LT |
484 | /* |
485 | * Previous logic looked for FILEMARK, EOM or ILI which are | |
486 | * mainly associated with tapes and returned SUCCESS. | |
487 | */ | |
488 | if (sshdr.response_code == 0x70) { | |
489 | /* fixed format */ | |
490 | if (scmd->sense_buffer[2] & 0xe0) | |
491 | return SUCCESS; | |
492 | } else { | |
493 | /* | |
494 | * descriptor format: look for "stream commands sense data | |
495 | * descriptor" (see SSC-3). Assume single sense data | |
496 | * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG. | |
497 | */ | |
498 | if ((sshdr.additional_length > 3) && | |
499 | (scmd->sense_buffer[8] == 0x4) && | |
500 | (scmd->sense_buffer[11] & 0xe0)) | |
501 | return SUCCESS; | |
502 | } | |
503 | ||
504 | switch (sshdr.sense_key) { | |
505 | case NO_SENSE: | |
506 | return SUCCESS; | |
507 | case RECOVERED_ERROR: | |
508 | return /* soft_error */ SUCCESS; | |
509 | ||
510 | case ABORTED_COMMAND: | |
511e44f4 MP |
511 | if (sshdr.asc == 0x10) /* DIF */ |
512 | return SUCCESS; | |
513 | ||
1da177e4 LT |
514 | return NEEDS_RETRY; |
515 | case NOT_READY: | |
516 | case UNIT_ATTENTION: | |
517 | /* | |
518 | * if we are expecting a cc/ua because of a bus reset that we | |
519 | * performed, treat this just as a retry. otherwise this is | |
520 | * information that we should pass up to the upper-level driver | |
521 | * so that we can deal with it there. | |
522 | */ | |
523 | if (scmd->device->expecting_cc_ua) { | |
dfcf7775 TH |
524 | /* |
525 | * Because some device does not queue unit | |
526 | * attentions correctly, we carefully check | |
527 | * additional sense code and qualifier so as | |
528 | * not to squash media change unit attention. | |
529 | */ | |
530 | if (sshdr.asc != 0x28 || sshdr.ascq != 0x00) { | |
531 | scmd->device->expecting_cc_ua = 0; | |
532 | return NEEDS_RETRY; | |
533 | } | |
1da177e4 | 534 | } |
279afdfe EM |
535 | /* |
536 | * we might also expect a cc/ua if another LUN on the target | |
537 | * reported a UA with an ASC/ASCQ of 3F 0E - | |
538 | * REPORTED LUNS DATA HAS CHANGED. | |
539 | */ | |
540 | if (scmd->device->sdev_target->expecting_lun_change && | |
541 | sshdr.asc == 0x3f && sshdr.ascq == 0x0e) | |
542 | return NEEDS_RETRY; | |
1da177e4 | 543 | /* |
0bf8c869 | 544 | * if the device is in the process of becoming ready, we |
1da177e4 LT |
545 | * should retry. |
546 | */ | |
547 | if ((sshdr.asc == 0x04) && (sshdr.ascq == 0x01)) | |
548 | return NEEDS_RETRY; | |
549 | /* | |
550 | * if the device is not started, we need to wake | |
551 | * the error handler to start the motor | |
552 | */ | |
553 | if (scmd->device->allow_restart && | |
554 | (sshdr.asc == 0x04) && (sshdr.ascq == 0x02)) | |
555 | return FAILED; | |
02e031cb CH |
556 | /* |
557 | * Pass the UA upwards for a determination in the completion | |
558 | * functions. | |
559 | */ | |
560 | return SUCCESS; | |
1da177e4 | 561 | |
63583cca | 562 | /* these are not supported */ |
a9d6ceb8 HR |
563 | case DATA_PROTECT: |
564 | if (sshdr.asc == 0x27 && sshdr.ascq == 0x07) { | |
565 | /* Thin provisioning hard threshold reached */ | |
566 | set_host_byte(scmd, DID_ALLOC_FAILURE); | |
567 | return SUCCESS; | |
568 | } | |
1da177e4 LT |
569 | case COPY_ABORTED: |
570 | case VOLUME_OVERFLOW: | |
571 | case MISCOMPARE: | |
63583cca | 572 | case BLANK_CHECK: |
87f14e65 HR |
573 | set_host_byte(scmd, DID_TARGET_FAILURE); |
574 | return SUCCESS; | |
1da177e4 LT |
575 | |
576 | case MEDIUM_ERROR: | |
fd1b494d LT |
577 | if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */ |
578 | sshdr.asc == 0x13 || /* AMNF DATA FIELD */ | |
579 | sshdr.asc == 0x14) { /* RECORD NOT FOUND */ | |
7e782af5 | 580 | set_host_byte(scmd, DID_MEDIUM_ERROR); |
87f14e65 | 581 | return SUCCESS; |
fd1b494d | 582 | } |
1da177e4 LT |
583 | return NEEDS_RETRY; |
584 | ||
585 | case HARDWARE_ERROR: | |
586 | if (scmd->device->retry_hwerror) | |
bb0003c1 | 587 | return ADD_TO_MLQUEUE; |
1da177e4 | 588 | else |
87f14e65 | 589 | set_host_byte(scmd, DID_TARGET_FAILURE); |
1da177e4 LT |
590 | |
591 | case ILLEGAL_REQUEST: | |
47ac56db MS |
592 | if (sshdr.asc == 0x20 || /* Invalid command operation code */ |
593 | sshdr.asc == 0x21 || /* Logical block address out of range */ | |
594 | sshdr.asc == 0x24 || /* Invalid field in cdb */ | |
595 | sshdr.asc == 0x26) { /* Parameter value invalid */ | |
87f14e65 | 596 | set_host_byte(scmd, DID_TARGET_FAILURE); |
47ac56db MS |
597 | } |
598 | return SUCCESS; | |
599 | ||
1da177e4 LT |
600 | default: |
601 | return SUCCESS; | |
602 | } | |
603 | } | |
604 | ||
4a84067d VD |
605 | static void scsi_handle_queue_ramp_up(struct scsi_device *sdev) |
606 | { | |
607 | struct scsi_host_template *sht = sdev->host->hostt; | |
608 | struct scsi_device *tmp_sdev; | |
609 | ||
610 | if (!sht->change_queue_depth || | |
611 | sdev->queue_depth >= sdev->max_queue_depth) | |
612 | return; | |
613 | ||
614 | if (time_before(jiffies, | |
615 | sdev->last_queue_ramp_up + sdev->queue_ramp_up_period)) | |
616 | return; | |
617 | ||
618 | if (time_before(jiffies, | |
619 | sdev->last_queue_full_time + sdev->queue_ramp_up_period)) | |
620 | return; | |
621 | ||
622 | /* | |
623 | * Walk all devices of a target and do | |
624 | * ramp up on them. | |
625 | */ | |
626 | shost_for_each_device(tmp_sdev, sdev->host) { | |
627 | if (tmp_sdev->channel != sdev->channel || | |
628 | tmp_sdev->id != sdev->id || | |
629 | tmp_sdev->queue_depth == sdev->max_queue_depth) | |
630 | continue; | |
631 | /* | |
632 | * call back into LLD to increase queue_depth by one | |
633 | * with ramp up reason code. | |
634 | */ | |
635 | sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1, | |
636 | SCSI_QDEPTH_RAMP_UP); | |
637 | sdev->last_queue_ramp_up = jiffies; | |
638 | } | |
639 | } | |
640 | ||
42a6a918 MC |
641 | static void scsi_handle_queue_full(struct scsi_device *sdev) |
642 | { | |
643 | struct scsi_host_template *sht = sdev->host->hostt; | |
644 | struct scsi_device *tmp_sdev; | |
645 | ||
646 | if (!sht->change_queue_depth) | |
647 | return; | |
648 | ||
649 | shost_for_each_device(tmp_sdev, sdev->host) { | |
650 | if (tmp_sdev->channel != sdev->channel || | |
651 | tmp_sdev->id != sdev->id) | |
652 | continue; | |
653 | /* | |
654 | * We do not know the number of commands that were at | |
655 | * the device when we got the queue full so we start | |
656 | * from the highest possible value and work our way down. | |
657 | */ | |
658 | sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth - 1, | |
659 | SCSI_QDEPTH_QFULL); | |
660 | } | |
661 | } | |
662 | ||
1da177e4 LT |
663 | /** |
664 | * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD. | |
665 | * @scmd: SCSI cmd to examine. | |
666 | * | |
667 | * Notes: | |
668 | * This is *only* called when we are examining the status of commands | |
669 | * queued during error recovery. the main difference here is that we | |
670 | * don't allow for the possibility of retries here, and we are a lot | |
671 | * more restrictive about what we consider acceptable. | |
dc8875e1 | 672 | */ |
1da177e4 LT |
673 | static int scsi_eh_completed_normally(struct scsi_cmnd *scmd) |
674 | { | |
675 | /* | |
676 | * first check the host byte, to see if there is anything in there | |
677 | * that would indicate what we need to do. | |
678 | */ | |
679 | if (host_byte(scmd->result) == DID_RESET) { | |
680 | /* | |
681 | * rats. we are already in the error handler, so we now | |
682 | * get to try and figure out what to do next. if the sense | |
683 | * is valid, we have a pretty good idea of what to do. | |
684 | * if not, we mark it as FAILED. | |
685 | */ | |
686 | return scsi_check_sense(scmd); | |
687 | } | |
688 | if (host_byte(scmd->result) != DID_OK) | |
689 | return FAILED; | |
690 | ||
691 | /* | |
692 | * next, check the message byte. | |
693 | */ | |
694 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
695 | return FAILED; | |
696 | ||
697 | /* | |
698 | * now, check the status byte to see if this indicates | |
699 | * anything special. | |
700 | */ | |
701 | switch (status_byte(scmd->result)) { | |
702 | case GOOD: | |
4a84067d | 703 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 LT |
704 | case COMMAND_TERMINATED: |
705 | return SUCCESS; | |
706 | case CHECK_CONDITION: | |
707 | return scsi_check_sense(scmd); | |
708 | case CONDITION_GOOD: | |
709 | case INTERMEDIATE_GOOD: | |
710 | case INTERMEDIATE_C_GOOD: | |
711 | /* | |
712 | * who knows? FIXME(eric) | |
713 | */ | |
714 | return SUCCESS; | |
5f91bb05 | 715 | case RESERVATION_CONFLICT: |
67110dfd JB |
716 | if (scmd->cmnd[0] == TEST_UNIT_READY) |
717 | /* it is a success, we probed the device and | |
718 | * found it */ | |
719 | return SUCCESS; | |
720 | /* otherwise, we failed to send the command */ | |
721 | return FAILED; | |
1da177e4 | 722 | case QUEUE_FULL: |
42a6a918 MC |
723 | scsi_handle_queue_full(scmd->device); |
724 | /* fall through */ | |
725 | case BUSY: | |
3eb3a928 | 726 | return NEEDS_RETRY; |
1da177e4 LT |
727 | default: |
728 | return FAILED; | |
729 | } | |
730 | return FAILED; | |
731 | } | |
732 | ||
1da177e4 LT |
733 | /** |
734 | * scsi_eh_done - Completion function for error handling. | |
735 | * @scmd: Cmd that is done. | |
dc8875e1 | 736 | */ |
1da177e4 LT |
737 | static void scsi_eh_done(struct scsi_cmnd *scmd) |
738 | { | |
0bf8c869 | 739 | struct completion *eh_action; |
85631672 | 740 | |
7dfdc9a5 CH |
741 | SCSI_LOG_ERROR_RECOVERY(3, |
742 | printk("%s scmd: %p result: %x\n", | |
cadbd4a5 | 743 | __func__, scmd, scmd->result)); |
85631672 MR |
744 | |
745 | eh_action = scmd->device->host->eh_action; | |
746 | if (eh_action) | |
747 | complete(eh_action); | |
1da177e4 LT |
748 | } |
749 | ||
292148f8 BK |
750 | /** |
751 | * scsi_try_host_reset - ask host adapter to reset itself | |
c2b3ebd0 | 752 | * @scmd: SCSI cmd to send host reset. |
dc8875e1 | 753 | */ |
292148f8 BK |
754 | static int scsi_try_host_reset(struct scsi_cmnd *scmd) |
755 | { | |
756 | unsigned long flags; | |
757 | int rtn; | |
0bf8c869 JJ |
758 | struct Scsi_Host *host = scmd->device->host; |
759 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 BK |
760 | |
761 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Host RST\n", | |
cadbd4a5 | 762 | __func__)); |
292148f8 | 763 | |
0bf8c869 | 764 | if (!hostt->eh_host_reset_handler) |
292148f8 BK |
765 | return FAILED; |
766 | ||
0bf8c869 | 767 | rtn = hostt->eh_host_reset_handler(scmd); |
292148f8 BK |
768 | |
769 | if (rtn == SUCCESS) { | |
0bf8c869 | 770 | if (!hostt->skip_settle_delay) |
292148f8 | 771 | ssleep(HOST_RESET_SETTLE_TIME); |
0bf8c869 JJ |
772 | spin_lock_irqsave(host->host_lock, flags); |
773 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
774 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
775 | } |
776 | ||
777 | return rtn; | |
778 | } | |
779 | ||
780 | /** | |
781 | * scsi_try_bus_reset - ask host to perform a bus reset | |
782 | * @scmd: SCSI cmd to send bus reset. | |
dc8875e1 | 783 | */ |
292148f8 BK |
784 | static int scsi_try_bus_reset(struct scsi_cmnd *scmd) |
785 | { | |
786 | unsigned long flags; | |
787 | int rtn; | |
0bf8c869 JJ |
788 | struct Scsi_Host *host = scmd->device->host; |
789 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 BK |
790 | |
791 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Bus RST\n", | |
cadbd4a5 | 792 | __func__)); |
292148f8 | 793 | |
0bf8c869 | 794 | if (!hostt->eh_bus_reset_handler) |
292148f8 BK |
795 | return FAILED; |
796 | ||
0bf8c869 | 797 | rtn = hostt->eh_bus_reset_handler(scmd); |
292148f8 BK |
798 | |
799 | if (rtn == SUCCESS) { | |
0bf8c869 | 800 | if (!hostt->skip_settle_delay) |
292148f8 | 801 | ssleep(BUS_RESET_SETTLE_TIME); |
0bf8c869 JJ |
802 | spin_lock_irqsave(host->host_lock, flags); |
803 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
804 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
805 | } |
806 | ||
807 | return rtn; | |
808 | } | |
809 | ||
30bd7df8 MC |
810 | static void __scsi_report_device_reset(struct scsi_device *sdev, void *data) |
811 | { | |
812 | sdev->was_reset = 1; | |
813 | sdev->expecting_cc_ua = 1; | |
814 | } | |
815 | ||
816 | /** | |
817 | * scsi_try_target_reset - Ask host to perform a target reset | |
818 | * @scmd: SCSI cmd used to send a target reset | |
819 | * | |
820 | * Notes: | |
821 | * There is no timeout for this operation. if this operation is | |
822 | * unreliable for a given host, then the host itself needs to put a | |
823 | * timer on it, and set the host back to a consistent state prior to | |
824 | * returning. | |
825 | */ | |
826 | static int scsi_try_target_reset(struct scsi_cmnd *scmd) | |
827 | { | |
828 | unsigned long flags; | |
829 | int rtn; | |
0bf8c869 JJ |
830 | struct Scsi_Host *host = scmd->device->host; |
831 | struct scsi_host_template *hostt = host->hostt; | |
30bd7df8 | 832 | |
0bf8c869 | 833 | if (!hostt->eh_target_reset_handler) |
30bd7df8 MC |
834 | return FAILED; |
835 | ||
0bf8c869 | 836 | rtn = hostt->eh_target_reset_handler(scmd); |
30bd7df8 | 837 | if (rtn == SUCCESS) { |
0bf8c869 | 838 | spin_lock_irqsave(host->host_lock, flags); |
30bd7df8 MC |
839 | __starget_for_each_device(scsi_target(scmd->device), NULL, |
840 | __scsi_report_device_reset); | |
0bf8c869 | 841 | spin_unlock_irqrestore(host->host_lock, flags); |
30bd7df8 MC |
842 | } |
843 | ||
844 | return rtn; | |
845 | } | |
846 | ||
292148f8 BK |
847 | /** |
848 | * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev | |
849 | * @scmd: SCSI cmd used to send BDR | |
850 | * | |
851 | * Notes: | |
852 | * There is no timeout for this operation. if this operation is | |
853 | * unreliable for a given host, then the host itself needs to put a | |
854 | * timer on it, and set the host back to a consistent state prior to | |
855 | * returning. | |
dc8875e1 | 856 | */ |
292148f8 BK |
857 | static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd) |
858 | { | |
859 | int rtn; | |
0bf8c869 | 860 | struct scsi_host_template *hostt = scmd->device->host->hostt; |
292148f8 | 861 | |
0bf8c869 | 862 | if (!hostt->eh_device_reset_handler) |
292148f8 BK |
863 | return FAILED; |
864 | ||
0bf8c869 | 865 | rtn = hostt->eh_device_reset_handler(scmd); |
30bd7df8 MC |
866 | if (rtn == SUCCESS) |
867 | __scsi_report_device_reset(scmd->device, NULL); | |
292148f8 BK |
868 | return rtn; |
869 | } | |
870 | ||
0bf8c869 | 871 | static int scsi_try_to_abort_cmd(struct scsi_host_template *hostt, struct scsi_cmnd *scmd) |
292148f8 | 872 | { |
0bf8c869 | 873 | if (!hostt->eh_abort_handler) |
292148f8 BK |
874 | return FAILED; |
875 | ||
0bf8c869 | 876 | return hostt->eh_abort_handler(scmd); |
292148f8 BK |
877 | } |
878 | ||
292148f8 BK |
879 | static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd) |
880 | { | |
0bf8c869 | 881 | if (scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd) != SUCCESS) |
292148f8 | 882 | if (scsi_try_bus_device_reset(scmd) != SUCCESS) |
30bd7df8 MC |
883 | if (scsi_try_target_reset(scmd) != SUCCESS) |
884 | if (scsi_try_bus_reset(scmd) != SUCCESS) | |
885 | scsi_try_host_reset(scmd); | |
292148f8 BK |
886 | } |
887 | ||
1da177e4 | 888 | /** |
3b729f76 | 889 | * scsi_eh_prep_cmnd - Save a scsi command info as part of error recovery |
2dc611de | 890 | * @scmd: SCSI command structure to hijack |
e1c23468 | 891 | * @ses: structure to save restore information |
55db6c1b | 892 | * @cmnd: CDB to send. Can be NULL if no new cmnd is needed |
64a87b24 | 893 | * @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB) |
55db6c1b | 894 | * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored) |
2dc611de | 895 | * |
e1c23468 | 896 | * This function is used to save a scsi command information before re-execution |
55db6c1b BH |
897 | * as part of the error recovery process. If @sense_bytes is 0 the command |
898 | * sent must be one that does not transfer any data. If @sense_bytes != 0 | |
899 | * @cmnd is ignored and this functions sets up a REQUEST_SENSE command | |
900 | * and cmnd buffers to read @sense_bytes into @scmd->sense_buffer. | |
dc8875e1 | 901 | */ |
e1c23468 BH |
902 | void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, |
903 | unsigned char *cmnd, int cmnd_size, unsigned sense_bytes) | |
1da177e4 | 904 | { |
f59114b7 | 905 | struct scsi_device *sdev = scmd->device; |
1da177e4 | 906 | |
631c228c CH |
907 | /* |
908 | * We need saved copies of a number of fields - this is because | |
909 | * error handling may need to overwrite these with different values | |
910 | * to run different commands, and once error handling is complete, | |
911 | * we will need to restore these values prior to running the actual | |
912 | * command. | |
913 | */ | |
e1c23468 | 914 | ses->cmd_len = scmd->cmd_len; |
64a87b24 | 915 | ses->cmnd = scmd->cmnd; |
e1c23468 | 916 | ses->data_direction = scmd->sc_data_direction; |
30b0c37b | 917 | ses->sdb = scmd->sdb; |
6f9a35e2 | 918 | ses->next_rq = scmd->request->next_rq; |
e1c23468 | 919 | ses->result = scmd->result; |
12265709 | 920 | ses->underflow = scmd->underflow; |
db007fc5 | 921 | ses->prot_op = scmd->prot_op; |
631c228c | 922 | |
db007fc5 | 923 | scmd->prot_op = SCSI_PROT_NORMAL; |
c69e6f81 | 924 | scmd->eh_eflags = 0; |
64a87b24 BH |
925 | scmd->cmnd = ses->eh_cmnd; |
926 | memset(scmd->cmnd, 0, BLK_MAX_CDB); | |
30b0c37b | 927 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
6f9a35e2 | 928 | scmd->request->next_rq = NULL; |
644373a4 | 929 | scmd->result = 0; |
30b0c37b | 930 | |
55db6c1b | 931 | if (sense_bytes) { |
30b0c37b BH |
932 | scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE, |
933 | sense_bytes); | |
e1c23468 | 934 | sg_init_one(&ses->sense_sgl, scmd->sense_buffer, |
30b0c37b BH |
935 | scmd->sdb.length); |
936 | scmd->sdb.table.sgl = &ses->sense_sgl; | |
55db6c1b | 937 | scmd->sc_data_direction = DMA_FROM_DEVICE; |
30b0c37b | 938 | scmd->sdb.table.nents = 1; |
55db6c1b | 939 | scmd->cmnd[0] = REQUEST_SENSE; |
30b0c37b | 940 | scmd->cmnd[4] = scmd->sdb.length; |
55db6c1b | 941 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); |
631c228c | 942 | } else { |
631c228c | 943 | scmd->sc_data_direction = DMA_NONE; |
55db6c1b | 944 | if (cmnd) { |
64a87b24 | 945 | BUG_ON(cmnd_size > BLK_MAX_CDB); |
55db6c1b BH |
946 | memcpy(scmd->cmnd, cmnd, cmnd_size); |
947 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); | |
948 | } | |
631c228c CH |
949 | } |
950 | ||
951 | scmd->underflow = 0; | |
631c228c | 952 | |
55db6c1b | 953 | if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN) |
1da177e4 | 954 | scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) | |
f59114b7 | 955 | (sdev->lun << 5 & 0xe0); |
1da177e4 | 956 | |
631c228c CH |
957 | /* |
958 | * Zero the sense buffer. The scsi spec mandates that any | |
959 | * untransferred sense data should be interpreted as being zero. | |
960 | */ | |
b80ca4f7 | 961 | memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); |
e1c23468 BH |
962 | } |
963 | EXPORT_SYMBOL(scsi_eh_prep_cmnd); | |
964 | ||
965 | /** | |
3b729f76 | 966 | * scsi_eh_restore_cmnd - Restore a scsi command info as part of error recovery |
e1c23468 | 967 | * @scmd: SCSI command structure to restore |
477e608c | 968 | * @ses: saved information from a coresponding call to scsi_eh_prep_cmnd |
e1c23468 | 969 | * |
477e608c | 970 | * Undo any damage done by above scsi_eh_prep_cmnd(). |
dc8875e1 | 971 | */ |
e1c23468 BH |
972 | void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses) |
973 | { | |
974 | /* | |
975 | * Restore original data | |
976 | */ | |
977 | scmd->cmd_len = ses->cmd_len; | |
64a87b24 | 978 | scmd->cmnd = ses->cmnd; |
e1c23468 | 979 | scmd->sc_data_direction = ses->data_direction; |
30b0c37b | 980 | scmd->sdb = ses->sdb; |
6f9a35e2 | 981 | scmd->request->next_rq = ses->next_rq; |
e1c23468 | 982 | scmd->result = ses->result; |
12265709 | 983 | scmd->underflow = ses->underflow; |
db007fc5 | 984 | scmd->prot_op = ses->prot_op; |
e1c23468 BH |
985 | } |
986 | EXPORT_SYMBOL(scsi_eh_restore_cmnd); | |
631c228c | 987 | |
e1c23468 | 988 | /** |
3b729f76 | 989 | * scsi_send_eh_cmnd - submit a scsi command as part of error recovery |
e1c23468 BH |
990 | * @scmd: SCSI command structure to hijack |
991 | * @cmnd: CDB to send | |
992 | * @cmnd_size: size in bytes of @cmnd | |
993 | * @timeout: timeout for this request | |
994 | * @sense_bytes: size of sense data to copy or 0 | |
995 | * | |
996 | * This function is used to send a scsi command down to a target device | |
997 | * as part of the error recovery process. See also scsi_eh_prep_cmnd() above. | |
998 | * | |
999 | * Return value: | |
1000 | * SUCCESS or FAILED or NEEDS_RETRY | |
dc8875e1 | 1001 | */ |
e1c23468 BH |
1002 | static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd, |
1003 | int cmnd_size, int timeout, unsigned sense_bytes) | |
1004 | { | |
1005 | struct scsi_device *sdev = scmd->device; | |
1006 | struct Scsi_Host *shost = sdev->host; | |
1007 | DECLARE_COMPLETION_ONSTACK(done); | |
fc73648a | 1008 | unsigned long timeleft = timeout; |
e1c23468 | 1009 | struct scsi_eh_save ses; |
fc73648a | 1010 | const unsigned long stall_for = msecs_to_jiffies(100); |
e1c23468 BH |
1011 | int rtn; |
1012 | ||
fc73648a | 1013 | retry: |
e1c23468 | 1014 | scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes); |
7dfdc9a5 | 1015 | shost->eh_action = &done; |
1da177e4 | 1016 | |
1da177e4 | 1017 | scsi_log_send(scmd); |
f281233d | 1018 | scmd->scsi_done = scsi_eh_done; |
fc73648a HR |
1019 | rtn = shost->hostt->queuecommand(shost, scmd); |
1020 | if (rtn) { | |
1021 | if (timeleft > stall_for) { | |
1022 | scsi_eh_restore_cmnd(scmd, &ses); | |
1023 | timeleft -= stall_for; | |
1024 | msleep(jiffies_to_msecs(stall_for)); | |
1025 | goto retry; | |
1026 | } | |
1027 | /* signal not to enter either branch of the if () below */ | |
1028 | timeleft = 0; | |
1029 | rtn = NEEDS_RETRY; | |
1030 | } else { | |
1031 | timeleft = wait_for_completion_timeout(&done, timeout); | |
1032 | } | |
1da177e4 | 1033 | |
f59114b7 | 1034 | shost->eh_action = NULL; |
1da177e4 | 1035 | |
fc73648a | 1036 | scsi_log_completion(scmd, rtn); |
1da177e4 | 1037 | |
7dfdc9a5 CH |
1038 | SCSI_LOG_ERROR_RECOVERY(3, |
1039 | printk("%s: scmd: %p, timeleft: %ld\n", | |
cadbd4a5 | 1040 | __func__, scmd, timeleft)); |
1da177e4 LT |
1041 | |
1042 | /* | |
fc73648a HR |
1043 | * If there is time left scsi_eh_done got called, and we will examine |
1044 | * the actual status codes to see whether the command actually did | |
1045 | * complete normally, else if we have a zero return and no time left, | |
1046 | * the command must still be pending, so abort it and return FAILED. | |
1047 | * If we never actually managed to issue the command, because | |
1048 | * ->queuecommand() kept returning non zero, use the rtn = FAILED | |
1049 | * value above (so don't execute either branch of the if) | |
1da177e4 | 1050 | */ |
7dfdc9a5 | 1051 | if (timeleft) { |
1da177e4 LT |
1052 | rtn = scsi_eh_completed_normally(scmd); |
1053 | SCSI_LOG_ERROR_RECOVERY(3, | |
1054 | printk("%s: scsi_eh_completed_normally %x\n", | |
cadbd4a5 | 1055 | __func__, rtn)); |
7dfdc9a5 | 1056 | |
1da177e4 LT |
1057 | switch (rtn) { |
1058 | case SUCCESS: | |
1059 | case NEEDS_RETRY: | |
1060 | case FAILED: | |
1061 | break; | |
6e883b0e HR |
1062 | case ADD_TO_MLQUEUE: |
1063 | rtn = NEEDS_RETRY; | |
1064 | break; | |
1da177e4 LT |
1065 | default: |
1066 | rtn = FAILED; | |
1067 | break; | |
1068 | } | |
fc73648a | 1069 | } else if (!rtn) { |
292148f8 | 1070 | scsi_abort_eh_cmnd(scmd); |
7dfdc9a5 | 1071 | rtn = FAILED; |
1da177e4 LT |
1072 | } |
1073 | ||
e1c23468 | 1074 | scsi_eh_restore_cmnd(scmd, &ses); |
18a4d0a2 | 1075 | |
1da177e4 LT |
1076 | return rtn; |
1077 | } | |
1078 | ||
1079 | /** | |
1080 | * scsi_request_sense - Request sense data from a particular target. | |
1081 | * @scmd: SCSI cmd for request sense. | |
1082 | * | |
1083 | * Notes: | |
1084 | * Some hosts automatically obtain this information, others require | |
1085 | * that we obtain it on our own. This function will *not* return until | |
1086 | * the command either times out, or it completes. | |
dc8875e1 | 1087 | */ |
1da177e4 LT |
1088 | static int scsi_request_sense(struct scsi_cmnd *scmd) |
1089 | { | |
0816c925 | 1090 | return scsi_send_eh_cmnd(scmd, NULL, 0, scmd->device->eh_timeout, ~0); |
1da177e4 LT |
1091 | } |
1092 | ||
2451079b JB |
1093 | static int scsi_eh_action(struct scsi_cmnd *scmd, int rtn) |
1094 | { | |
1095 | if (scmd->request->cmd_type != REQ_TYPE_BLOCK_PC) { | |
1096 | struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd); | |
1097 | if (sdrv->eh_action) | |
1098 | rtn = sdrv->eh_action(scmd, rtn); | |
1099 | } | |
1100 | return rtn; | |
1101 | } | |
1102 | ||
1da177e4 LT |
1103 | /** |
1104 | * scsi_eh_finish_cmd - Handle a cmd that eh is finished with. | |
1105 | * @scmd: Original SCSI cmd that eh has finished. | |
1106 | * @done_q: Queue for processed commands. | |
1107 | * | |
1108 | * Notes: | |
1109 | * We don't want to use the normal command completion while we are are | |
1110 | * still handling errors - it may cause other commands to be queued, | |
eb44820c | 1111 | * and that would disturb what we are doing. Thus we really want to |
1da177e4 LT |
1112 | * keep a list of pending commands for final completion, and once we |
1113 | * are ready to leave error handling we handle completion for real. | |
dc8875e1 | 1114 | */ |
041c5fc3 | 1115 | void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q) |
1da177e4 LT |
1116 | { |
1117 | scmd->device->host->host_failed--; | |
3111b0d1 | 1118 | scmd->eh_eflags = 0; |
1da177e4 LT |
1119 | list_move_tail(&scmd->eh_entry, done_q); |
1120 | } | |
041c5fc3 | 1121 | EXPORT_SYMBOL(scsi_eh_finish_cmd); |
1da177e4 LT |
1122 | |
1123 | /** | |
1124 | * scsi_eh_get_sense - Get device sense data. | |
1125 | * @work_q: Queue of commands to process. | |
eb44820c | 1126 | * @done_q: Queue of processed commands. |
1da177e4 LT |
1127 | * |
1128 | * Description: | |
1129 | * See if we need to request sense information. if so, then get it | |
0bf8c869 | 1130 | * now, so we have a better idea of what to do. |
1da177e4 LT |
1131 | * |
1132 | * Notes: | |
1133 | * This has the unfortunate side effect that if a shost adapter does | |
eb44820c | 1134 | * not automatically request sense information, we end up shutting |
1da177e4 LT |
1135 | * it down before we request it. |
1136 | * | |
1137 | * All drivers should request sense information internally these days, | |
1138 | * so for now all I have to say is tough noogies if you end up in here. | |
1139 | * | |
1140 | * XXX: Long term this code should go away, but that needs an audit of | |
1141 | * all LLDDs first. | |
dc8875e1 | 1142 | */ |
dca84e46 DW |
1143 | int scsi_eh_get_sense(struct list_head *work_q, |
1144 | struct list_head *done_q) | |
1da177e4 | 1145 | { |
937abeaa | 1146 | struct scsi_cmnd *scmd, *next; |
b4562022 | 1147 | struct Scsi_Host *shost; |
1da177e4 LT |
1148 | int rtn; |
1149 | ||
937abeaa | 1150 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 1151 | if ((scmd->eh_eflags & SCSI_EH_CANCEL_CMD) || |
1da177e4 LT |
1152 | SCSI_SENSE_VALID(scmd)) |
1153 | continue; | |
1154 | ||
b4562022 | 1155 | shost = scmd->device->host; |
b4562022 | 1156 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 HR |
1157 | SCSI_LOG_ERROR_RECOVERY(3, |
1158 | shost_printk(KERN_INFO, shost, | |
1159 | "skip %s, past eh deadline\n", | |
1160 | __func__)); | |
1161 | break; | |
1162 | } | |
d555a2ab JB |
1163 | if (status_byte(scmd->result) != CHECK_CONDITION) |
1164 | /* | |
1165 | * don't request sense if there's no check condition | |
1166 | * status because the error we're processing isn't one | |
1167 | * that has a sense code (and some devices get | |
1168 | * confused by sense requests out of the blue) | |
1169 | */ | |
1170 | continue; | |
1171 | ||
3bf743e7 JG |
1172 | SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd, |
1173 | "%s: requesting sense\n", | |
1174 | current->comm)); | |
1da177e4 LT |
1175 | rtn = scsi_request_sense(scmd); |
1176 | if (rtn != SUCCESS) | |
1177 | continue; | |
1178 | ||
1179 | SCSI_LOG_ERROR_RECOVERY(3, printk("sense requested for %p" | |
1180 | " result %x\n", scmd, | |
1181 | scmd->result)); | |
1182 | SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense("bh", scmd)); | |
1183 | ||
1184 | rtn = scsi_decide_disposition(scmd); | |
1185 | ||
1186 | /* | |
1187 | * if the result was normal, then just pass it along to the | |
1188 | * upper level. | |
1189 | */ | |
1190 | if (rtn == SUCCESS) | |
1191 | /* we don't want this command reissued, just | |
1192 | * finished with the sense data, so set | |
1193 | * retries to the max allowed to ensure it | |
1194 | * won't get reissued */ | |
1195 | scmd->retries = scmd->allowed; | |
1196 | else if (rtn != NEEDS_RETRY) | |
1197 | continue; | |
1198 | ||
1199 | scsi_eh_finish_cmd(scmd, done_q); | |
1200 | } | |
1201 | ||
1202 | return list_empty(work_q); | |
1203 | } | |
dca84e46 | 1204 | EXPORT_SYMBOL_GPL(scsi_eh_get_sense); |
1da177e4 | 1205 | |
1da177e4 LT |
1206 | /** |
1207 | * scsi_eh_tur - Send TUR to device. | |
eb44820c | 1208 | * @scmd: &scsi_cmnd to send TUR |
1da177e4 LT |
1209 | * |
1210 | * Return value: | |
1211 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1212 | */ |
1da177e4 LT |
1213 | static int scsi_eh_tur(struct scsi_cmnd *scmd) |
1214 | { | |
1215 | static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0}; | |
1216 | int retry_cnt = 1, rtn; | |
1217 | ||
1218 | retry_tur: | |
0816c925 MP |
1219 | rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, |
1220 | scmd->device->eh_timeout, 0); | |
1da177e4 | 1221 | |
1da177e4 | 1222 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd %p rtn %x\n", |
cadbd4a5 | 1223 | __func__, scmd, rtn)); |
631c228c CH |
1224 | |
1225 | switch (rtn) { | |
1226 | case NEEDS_RETRY: | |
1da177e4 LT |
1227 | if (retry_cnt--) |
1228 | goto retry_tur; | |
631c228c CH |
1229 | /*FALLTHRU*/ |
1230 | case SUCCESS: | |
e47373ec | 1231 | return 0; |
631c228c CH |
1232 | default: |
1233 | return 1; | |
e47373ec | 1234 | } |
1da177e4 LT |
1235 | } |
1236 | ||
3eef6257 DJ |
1237 | /** |
1238 | * scsi_eh_test_devices - check if devices are responding from error recovery. | |
1239 | * @cmd_list: scsi commands in error recovery. | |
1240 | * @work_q: queue for commands which still need more error recovery | |
1241 | * @done_q: queue for commands which are finished | |
1242 | * @try_stu: boolean on if a STU command should be tried in addition to TUR. | |
1243 | * | |
1244 | * Decription: | |
1245 | * Tests if devices are in a working state. Commands to devices now in | |
1246 | * a working state are sent to the done_q while commands to devices which | |
1247 | * are still failing to respond are returned to the work_q for more | |
1248 | * processing. | |
1249 | **/ | |
1250 | static int scsi_eh_test_devices(struct list_head *cmd_list, | |
1251 | struct list_head *work_q, | |
1252 | struct list_head *done_q, int try_stu) | |
1253 | { | |
1254 | struct scsi_cmnd *scmd, *next; | |
1255 | struct scsi_device *sdev; | |
1256 | int finish_cmds; | |
1257 | ||
1258 | while (!list_empty(cmd_list)) { | |
1259 | scmd = list_entry(cmd_list->next, struct scsi_cmnd, eh_entry); | |
1260 | sdev = scmd->device; | |
1261 | ||
b4562022 | 1262 | if (!try_stu) { |
b4562022 HR |
1263 | if (scsi_host_eh_past_deadline(sdev->host)) { |
1264 | /* Push items back onto work_q */ | |
1265 | list_splice_init(cmd_list, work_q); | |
b4562022 HR |
1266 | SCSI_LOG_ERROR_RECOVERY(3, |
1267 | shost_printk(KERN_INFO, sdev->host, | |
1268 | "skip %s, past eh deadline", | |
1269 | __func__)); | |
1270 | break; | |
1271 | } | |
b4562022 HR |
1272 | } |
1273 | ||
3eef6257 DJ |
1274 | finish_cmds = !scsi_device_online(scmd->device) || |
1275 | (try_stu && !scsi_eh_try_stu(scmd) && | |
1276 | !scsi_eh_tur(scmd)) || | |
1277 | !scsi_eh_tur(scmd); | |
1278 | ||
1279 | list_for_each_entry_safe(scmd, next, cmd_list, eh_entry) | |
1280 | if (scmd->device == sdev) { | |
2451079b JB |
1281 | if (finish_cmds && |
1282 | (try_stu || | |
1283 | scsi_eh_action(scmd, SUCCESS) == SUCCESS)) | |
3eef6257 DJ |
1284 | scsi_eh_finish_cmd(scmd, done_q); |
1285 | else | |
1286 | list_move_tail(&scmd->eh_entry, work_q); | |
1287 | } | |
1288 | } | |
1289 | return list_empty(work_q); | |
1290 | } | |
1291 | ||
1292 | ||
1da177e4 | 1293 | /** |
eb44820c RL |
1294 | * scsi_eh_abort_cmds - abort pending commands. |
1295 | * @work_q: &list_head for pending commands. | |
1296 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1297 | * |
1298 | * Decription: | |
1299 | * Try and see whether or not it makes sense to try and abort the | |
eb44820c RL |
1300 | * running command. This only works out to be the case if we have one |
1301 | * command that has timed out. If the command simply failed, it makes | |
1da177e4 LT |
1302 | * no sense to try and abort the command, since as far as the shost |
1303 | * adapter is concerned, it isn't running. | |
dc8875e1 | 1304 | */ |
1da177e4 LT |
1305 | static int scsi_eh_abort_cmds(struct list_head *work_q, |
1306 | struct list_head *done_q) | |
1307 | { | |
937abeaa | 1308 | struct scsi_cmnd *scmd, *next; |
3eef6257 | 1309 | LIST_HEAD(check_list); |
1da177e4 | 1310 | int rtn; |
b4562022 | 1311 | struct Scsi_Host *shost; |
1da177e4 | 1312 | |
937abeaa | 1313 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 1314 | if (!(scmd->eh_eflags & SCSI_EH_CANCEL_CMD)) |
1da177e4 | 1315 | continue; |
b4562022 | 1316 | shost = scmd->device->host; |
b4562022 | 1317 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 HR |
1318 | list_splice_init(&check_list, work_q); |
1319 | SCSI_LOG_ERROR_RECOVERY(3, | |
1320 | shost_printk(KERN_INFO, shost, | |
1321 | "skip %s, past eh deadline\n", | |
1322 | __func__)); | |
1323 | return list_empty(work_q); | |
1324 | } | |
1da177e4 LT |
1325 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting cmd:" |
1326 | "0x%p\n", current->comm, | |
1327 | scmd)); | |
b4562022 | 1328 | rtn = scsi_try_to_abort_cmd(shost->hostt, scmd); |
6fd046f9 | 1329 | if (rtn == FAILED) { |
1da177e4 LT |
1330 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting" |
1331 | " cmd failed:" | |
1332 | "0x%p\n", | |
1333 | current->comm, | |
1334 | scmd)); | |
6fd046f9 HR |
1335 | list_splice_init(&check_list, work_q); |
1336 | return list_empty(work_q); | |
1337 | } | |
1338 | scmd->eh_eflags &= ~SCSI_EH_CANCEL_CMD; | |
1339 | if (rtn == FAST_IO_FAIL) | |
1340 | scsi_eh_finish_cmd(scmd, done_q); | |
1341 | else | |
1342 | list_move_tail(&scmd->eh_entry, &check_list); | |
1da177e4 LT |
1343 | } |
1344 | ||
3eef6257 | 1345 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4 LT |
1346 | } |
1347 | ||
1da177e4 LT |
1348 | /** |
1349 | * scsi_eh_try_stu - Send START_UNIT to device. | |
eb44820c | 1350 | * @scmd: &scsi_cmnd to send START_UNIT |
1da177e4 LT |
1351 | * |
1352 | * Return value: | |
1353 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1354 | */ |
1da177e4 LT |
1355 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd) |
1356 | { | |
1357 | static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0}; | |
1da177e4 | 1358 | |
631c228c | 1359 | if (scmd->device->allow_restart) { |
ed773e66 BK |
1360 | int i, rtn = NEEDS_RETRY; |
1361 | ||
1362 | for (i = 0; rtn == NEEDS_RETRY && i < 2; i++) | |
9728c081 | 1363 | rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0); |
1da177e4 | 1364 | |
631c228c CH |
1365 | if (rtn == SUCCESS) |
1366 | return 0; | |
1367 | } | |
1da177e4 | 1368 | |
1da177e4 LT |
1369 | return 1; |
1370 | } | |
1371 | ||
1372 | /** | |
1373 | * scsi_eh_stu - send START_UNIT if needed | |
eb44820c RL |
1374 | * @shost: &scsi host being recovered. |
1375 | * @work_q: &list_head for pending commands. | |
1376 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1377 | * |
1378 | * Notes: | |
1379 | * If commands are failing due to not ready, initializing command required, | |
0bf8c869 | 1380 | * try revalidating the device, which will end up sending a start unit. |
dc8875e1 | 1381 | */ |
1da177e4 LT |
1382 | static int scsi_eh_stu(struct Scsi_Host *shost, |
1383 | struct list_head *work_q, | |
1384 | struct list_head *done_q) | |
1385 | { | |
937abeaa | 1386 | struct scsi_cmnd *scmd, *stu_scmd, *next; |
1da177e4 LT |
1387 | struct scsi_device *sdev; |
1388 | ||
1389 | shost_for_each_device(sdev, shost) { | |
b4562022 | 1390 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 HR |
1391 | SCSI_LOG_ERROR_RECOVERY(3, |
1392 | shost_printk(KERN_INFO, shost, | |
1393 | "skip %s, past eh deadline\n", | |
1394 | __func__)); | |
1395 | break; | |
1396 | } | |
1da177e4 LT |
1397 | stu_scmd = NULL; |
1398 | list_for_each_entry(scmd, work_q, eh_entry) | |
1399 | if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) && | |
1400 | scsi_check_sense(scmd) == FAILED ) { | |
1401 | stu_scmd = scmd; | |
1402 | break; | |
1403 | } | |
1404 | ||
1405 | if (!stu_scmd) | |
1406 | continue; | |
1407 | ||
1408 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending START_UNIT to sdev:" | |
1409 | " 0x%p\n", current->comm, sdev)); | |
1410 | ||
1411 | if (!scsi_eh_try_stu(stu_scmd)) { | |
1412 | if (!scsi_device_online(sdev) || | |
1413 | !scsi_eh_tur(stu_scmd)) { | |
937abeaa CH |
1414 | list_for_each_entry_safe(scmd, next, |
1415 | work_q, eh_entry) { | |
2451079b JB |
1416 | if (scmd->device == sdev && |
1417 | scsi_eh_action(scmd, SUCCESS) == SUCCESS) | |
1da177e4 LT |
1418 | scsi_eh_finish_cmd(scmd, done_q); |
1419 | } | |
1420 | } | |
1421 | } else { | |
1422 | SCSI_LOG_ERROR_RECOVERY(3, | |
1423 | printk("%s: START_UNIT failed to sdev:" | |
1424 | " 0x%p\n", current->comm, sdev)); | |
1425 | } | |
1426 | } | |
1427 | ||
1428 | return list_empty(work_q); | |
1429 | } | |
1430 | ||
1431 | ||
1432 | /** | |
1433 | * scsi_eh_bus_device_reset - send bdr if needed | |
1434 | * @shost: scsi host being recovered. | |
eb44820c RL |
1435 | * @work_q: &list_head for pending commands. |
1436 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1437 | * |
1438 | * Notes: | |
eb44820c | 1439 | * Try a bus device reset. Still, look to see whether we have multiple |
1da177e4 LT |
1440 | * devices that are jammed or not - if we have multiple devices, it |
1441 | * makes no sense to try bus_device_reset - we really would need to try | |
0bf8c869 | 1442 | * a bus_reset instead. |
dc8875e1 | 1443 | */ |
1da177e4 LT |
1444 | static int scsi_eh_bus_device_reset(struct Scsi_Host *shost, |
1445 | struct list_head *work_q, | |
1446 | struct list_head *done_q) | |
1447 | { | |
937abeaa | 1448 | struct scsi_cmnd *scmd, *bdr_scmd, *next; |
1da177e4 LT |
1449 | struct scsi_device *sdev; |
1450 | int rtn; | |
1451 | ||
1452 | shost_for_each_device(sdev, shost) { | |
b4562022 | 1453 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 HR |
1454 | SCSI_LOG_ERROR_RECOVERY(3, |
1455 | shost_printk(KERN_INFO, shost, | |
1456 | "skip %s, past eh deadline\n", | |
1457 | __func__)); | |
1458 | break; | |
1459 | } | |
1da177e4 LT |
1460 | bdr_scmd = NULL; |
1461 | list_for_each_entry(scmd, work_q, eh_entry) | |
1462 | if (scmd->device == sdev) { | |
1463 | bdr_scmd = scmd; | |
1464 | break; | |
1465 | } | |
1466 | ||
1467 | if (!bdr_scmd) | |
1468 | continue; | |
1469 | ||
1470 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BDR sdev:" | |
1471 | " 0x%p\n", current->comm, | |
1472 | sdev)); | |
1473 | rtn = scsi_try_bus_device_reset(bdr_scmd); | |
2f2eb587 | 1474 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
1da177e4 | 1475 | if (!scsi_device_online(sdev) || |
2f2eb587 | 1476 | rtn == FAST_IO_FAIL || |
1da177e4 | 1477 | !scsi_eh_tur(bdr_scmd)) { |
937abeaa CH |
1478 | list_for_each_entry_safe(scmd, next, |
1479 | work_q, eh_entry) { | |
2451079b JB |
1480 | if (scmd->device == sdev && |
1481 | scsi_eh_action(scmd, rtn) != FAILED) | |
1da177e4 LT |
1482 | scsi_eh_finish_cmd(scmd, |
1483 | done_q); | |
1484 | } | |
1485 | } | |
1486 | } else { | |
1487 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BDR" | |
1488 | " failed sdev:" | |
1489 | "0x%p\n", | |
1490 | current->comm, | |
1491 | sdev)); | |
1492 | } | |
1493 | } | |
1494 | ||
1495 | return list_empty(work_q); | |
1496 | } | |
1497 | ||
30bd7df8 MC |
1498 | /** |
1499 | * scsi_eh_target_reset - send target reset if needed | |
1500 | * @shost: scsi host being recovered. | |
1501 | * @work_q: &list_head for pending commands. | |
1502 | * @done_q: &list_head for processed commands. | |
1503 | * | |
1504 | * Notes: | |
1505 | * Try a target reset. | |
1506 | */ | |
1507 | static int scsi_eh_target_reset(struct Scsi_Host *shost, | |
1508 | struct list_head *work_q, | |
1509 | struct list_head *done_q) | |
1510 | { | |
98db5195 | 1511 | LIST_HEAD(tmp_list); |
3eef6257 | 1512 | LIST_HEAD(check_list); |
30bd7df8 | 1513 | |
98db5195 JB |
1514 | list_splice_init(work_q, &tmp_list); |
1515 | ||
1516 | while (!list_empty(&tmp_list)) { | |
1517 | struct scsi_cmnd *next, *scmd; | |
1518 | int rtn; | |
1519 | unsigned int id; | |
b4562022 | 1520 | |
b4562022 | 1521 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 HR |
1522 | /* push back on work queue for further processing */ |
1523 | list_splice_init(&check_list, work_q); | |
1524 | list_splice_init(&tmp_list, work_q); | |
1525 | SCSI_LOG_ERROR_RECOVERY(3, | |
1526 | shost_printk(KERN_INFO, shost, | |
1527 | "skip %s, past eh deadline\n", | |
1528 | __func__)); | |
1529 | return list_empty(work_q); | |
1530 | } | |
98db5195 JB |
1531 | |
1532 | scmd = list_entry(tmp_list.next, struct scsi_cmnd, eh_entry); | |
1533 | id = scmd_id(scmd); | |
30bd7df8 MC |
1534 | |
1535 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending target reset " | |
1536 | "to target %d\n", | |
1537 | current->comm, id)); | |
98db5195 JB |
1538 | rtn = scsi_try_target_reset(scmd); |
1539 | if (rtn != SUCCESS && rtn != FAST_IO_FAIL) | |
30bd7df8 MC |
1540 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Target reset" |
1541 | " failed target: " | |
1542 | "%d\n", | |
1543 | current->comm, id)); | |
98db5195 JB |
1544 | list_for_each_entry_safe(scmd, next, &tmp_list, eh_entry) { |
1545 | if (scmd_id(scmd) != id) | |
1546 | continue; | |
1547 | ||
3eef6257 DJ |
1548 | if (rtn == SUCCESS) |
1549 | list_move_tail(&scmd->eh_entry, &check_list); | |
1550 | else if (rtn == FAST_IO_FAIL) | |
98db5195 JB |
1551 | scsi_eh_finish_cmd(scmd, done_q); |
1552 | else | |
1553 | /* push back on work queue for further processing */ | |
1554 | list_move(&scmd->eh_entry, work_q); | |
1555 | } | |
1556 | } | |
30bd7df8 | 1557 | |
3eef6257 | 1558 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
30bd7df8 MC |
1559 | } |
1560 | ||
1da177e4 | 1561 | /** |
0bf8c869 | 1562 | * scsi_eh_bus_reset - send a bus reset |
eb44820c RL |
1563 | * @shost: &scsi host being recovered. |
1564 | * @work_q: &list_head for pending commands. | |
1565 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1566 | */ |
1da177e4 LT |
1567 | static int scsi_eh_bus_reset(struct Scsi_Host *shost, |
1568 | struct list_head *work_q, | |
1569 | struct list_head *done_q) | |
1570 | { | |
937abeaa | 1571 | struct scsi_cmnd *scmd, *chan_scmd, *next; |
3eef6257 | 1572 | LIST_HEAD(check_list); |
1da177e4 LT |
1573 | unsigned int channel; |
1574 | int rtn; | |
1575 | ||
1576 | /* | |
1577 | * we really want to loop over the various channels, and do this on | |
1578 | * a channel by channel basis. we should also check to see if any | |
1579 | * of the failed commands are on soft_reset devices, and if so, skip | |
0bf8c869 | 1580 | * the reset. |
1da177e4 LT |
1581 | */ |
1582 | ||
1583 | for (channel = 0; channel <= shost->max_channel; channel++) { | |
b4562022 | 1584 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 HR |
1585 | list_splice_init(&check_list, work_q); |
1586 | SCSI_LOG_ERROR_RECOVERY(3, | |
1587 | shost_printk(KERN_INFO, shost, | |
1588 | "skip %s, past eh deadline\n", | |
1589 | __func__)); | |
1590 | return list_empty(work_q); | |
1591 | } | |
b4562022 | 1592 | |
1da177e4 LT |
1593 | chan_scmd = NULL; |
1594 | list_for_each_entry(scmd, work_q, eh_entry) { | |
422c0d61 | 1595 | if (channel == scmd_channel(scmd)) { |
1da177e4 LT |
1596 | chan_scmd = scmd; |
1597 | break; | |
1598 | /* | |
1599 | * FIXME add back in some support for | |
1600 | * soft_reset devices. | |
1601 | */ | |
1602 | } | |
1603 | } | |
1604 | ||
1605 | if (!chan_scmd) | |
1606 | continue; | |
1607 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BRST chan:" | |
1608 | " %d\n", current->comm, | |
1609 | channel)); | |
1610 | rtn = scsi_try_bus_reset(chan_scmd); | |
2f2eb587 | 1611 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
937abeaa | 1612 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3eef6257 DJ |
1613 | if (channel == scmd_channel(scmd)) { |
1614 | if (rtn == FAST_IO_FAIL) | |
1da177e4 LT |
1615 | scsi_eh_finish_cmd(scmd, |
1616 | done_q); | |
3eef6257 DJ |
1617 | else |
1618 | list_move_tail(&scmd->eh_entry, | |
1619 | &check_list); | |
1620 | } | |
1da177e4 LT |
1621 | } |
1622 | } else { | |
1623 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BRST" | |
1624 | " failed chan: %d\n", | |
1625 | current->comm, | |
1626 | channel)); | |
1627 | } | |
1628 | } | |
3eef6257 | 1629 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4 LT |
1630 | } |
1631 | ||
1632 | /** | |
0bf8c869 | 1633 | * scsi_eh_host_reset - send a host reset |
1da177e4 LT |
1634 | * @work_q: list_head for processed commands. |
1635 | * @done_q: list_head for processed commands. | |
dc8875e1 | 1636 | */ |
1da177e4 LT |
1637 | static int scsi_eh_host_reset(struct list_head *work_q, |
1638 | struct list_head *done_q) | |
1639 | { | |
937abeaa | 1640 | struct scsi_cmnd *scmd, *next; |
3eef6257 | 1641 | LIST_HEAD(check_list); |
1da177e4 | 1642 | int rtn; |
1da177e4 LT |
1643 | |
1644 | if (!list_empty(work_q)) { | |
1645 | scmd = list_entry(work_q->next, | |
1646 | struct scsi_cmnd, eh_entry); | |
1647 | ||
1648 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending HRST\n" | |
1649 | , current->comm)); | |
1650 | ||
1651 | rtn = scsi_try_host_reset(scmd); | |
3eef6257 DJ |
1652 | if (rtn == SUCCESS) { |
1653 | list_splice_init(work_q, &check_list); | |
1654 | } else if (rtn == FAST_IO_FAIL) { | |
937abeaa | 1655 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1da177e4 LT |
1656 | scsi_eh_finish_cmd(scmd, done_q); |
1657 | } | |
1658 | } else { | |
1659 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: HRST" | |
1660 | " failed\n", | |
1661 | current->comm)); | |
1662 | } | |
1663 | } | |
3eef6257 | 1664 | return scsi_eh_test_devices(&check_list, work_q, done_q, 1); |
1da177e4 LT |
1665 | } |
1666 | ||
1667 | /** | |
1668 | * scsi_eh_offline_sdevs - offline scsi devices that fail to recover | |
1669 | * @work_q: list_head for processed commands. | |
1670 | * @done_q: list_head for processed commands. | |
dc8875e1 | 1671 | */ |
1da177e4 LT |
1672 | static void scsi_eh_offline_sdevs(struct list_head *work_q, |
1673 | struct list_head *done_q) | |
1674 | { | |
937abeaa | 1675 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1676 | |
937abeaa | 1677 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
31765d7d MW |
1678 | sdev_printk(KERN_INFO, scmd->device, "Device offlined - " |
1679 | "not ready after error recovery\n"); | |
1da177e4 | 1680 | scsi_device_set_state(scmd->device, SDEV_OFFLINE); |
3111b0d1 | 1681 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) { |
1da177e4 LT |
1682 | /* |
1683 | * FIXME: Handle lost cmds. | |
1684 | */ | |
1685 | } | |
1686 | scsi_eh_finish_cmd(scmd, done_q); | |
1687 | } | |
1688 | return; | |
1689 | } | |
1690 | ||
4a27446f | 1691 | /** |
e494f6a7 | 1692 | * scsi_noretry_cmd - determine if command should be failed fast |
4a27446f MC |
1693 | * @scmd: SCSI cmd to examine. |
1694 | */ | |
1695 | int scsi_noretry_cmd(struct scsi_cmnd *scmd) | |
1696 | { | |
1697 | switch (host_byte(scmd->result)) { | |
1698 | case DID_OK: | |
1699 | break; | |
e494f6a7 HR |
1700 | case DID_TIME_OUT: |
1701 | goto check_type; | |
4a27446f | 1702 | case DID_BUS_BUSY: |
33659ebb | 1703 | return (scmd->request->cmd_flags & REQ_FAILFAST_TRANSPORT); |
4a27446f | 1704 | case DID_PARITY: |
33659ebb | 1705 | return (scmd->request->cmd_flags & REQ_FAILFAST_DEV); |
4a27446f MC |
1706 | case DID_ERROR: |
1707 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1708 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1709 | return 0; | |
1710 | /* fall through */ | |
1711 | case DID_SOFT_ERROR: | |
33659ebb | 1712 | return (scmd->request->cmd_flags & REQ_FAILFAST_DRIVER); |
4a27446f MC |
1713 | } |
1714 | ||
e494f6a7 HR |
1715 | if (status_byte(scmd->result) != CHECK_CONDITION) |
1716 | return 0; | |
4a27446f | 1717 | |
e494f6a7 HR |
1718 | check_type: |
1719 | /* | |
1720 | * assume caller has checked sense and determined | |
1721 | * the check condition was retryable. | |
1722 | */ | |
1723 | if (scmd->request->cmd_flags & REQ_FAILFAST_DEV || | |
1724 | scmd->request->cmd_type == REQ_TYPE_BLOCK_PC) | |
1725 | return 1; | |
1726 | else | |
1727 | return 0; | |
4a27446f MC |
1728 | } |
1729 | ||
1da177e4 LT |
1730 | /** |
1731 | * scsi_decide_disposition - Disposition a cmd on return from LLD. | |
1732 | * @scmd: SCSI cmd to examine. | |
1733 | * | |
1734 | * Notes: | |
1735 | * This is *only* called when we are examining the status after sending | |
1736 | * out the actual data command. any commands that are queued for error | |
1737 | * recovery (e.g. test_unit_ready) do *not* come through here. | |
1738 | * | |
1739 | * When this routine returns failed, it means the error handler thread | |
1740 | * is woken. In cases where the error code indicates an error that | |
1741 | * doesn't require the error handler read (i.e. we don't need to | |
1742 | * abort/reset), this function should return SUCCESS. | |
dc8875e1 | 1743 | */ |
1da177e4 LT |
1744 | int scsi_decide_disposition(struct scsi_cmnd *scmd) |
1745 | { | |
1746 | int rtn; | |
1747 | ||
1748 | /* | |
1749 | * if the device is offline, then we clearly just pass the result back | |
1750 | * up to the top level. | |
1751 | */ | |
1752 | if (!scsi_device_online(scmd->device)) { | |
1753 | SCSI_LOG_ERROR_RECOVERY(5, printk("%s: device offline - report" | |
1754 | " as SUCCESS\n", | |
cadbd4a5 | 1755 | __func__)); |
1da177e4 LT |
1756 | return SUCCESS; |
1757 | } | |
1758 | ||
1759 | /* | |
1760 | * first check the host byte, to see if there is anything in there | |
1761 | * that would indicate what we need to do. | |
1762 | */ | |
1763 | switch (host_byte(scmd->result)) { | |
1764 | case DID_PASSTHROUGH: | |
1765 | /* | |
1766 | * no matter what, pass this through to the upper layer. | |
1767 | * nuke this special code so that it looks like we are saying | |
1768 | * did_ok. | |
1769 | */ | |
1770 | scmd->result &= 0xff00ffff; | |
1771 | return SUCCESS; | |
1772 | case DID_OK: | |
1773 | /* | |
1774 | * looks good. drop through, and check the next byte. | |
1775 | */ | |
1776 | break; | |
e494f6a7 HR |
1777 | case DID_ABORT: |
1778 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) { | |
1779 | scmd->result |= DID_TIME_OUT << 16; | |
1780 | return SUCCESS; | |
1781 | } | |
1da177e4 LT |
1782 | case DID_NO_CONNECT: |
1783 | case DID_BAD_TARGET: | |
1da177e4 LT |
1784 | /* |
1785 | * note - this means that we just report the status back | |
1786 | * to the top level driver, not that we actually think | |
1787 | * that it indicates SUCCESS. | |
1788 | */ | |
1789 | return SUCCESS; | |
1790 | /* | |
1791 | * when the low level driver returns did_soft_error, | |
0bf8c869 | 1792 | * it is responsible for keeping an internal retry counter |
1da177e4 LT |
1793 | * in order to avoid endless loops (db) |
1794 | * | |
1795 | * actually this is a bug in this function here. we should | |
1796 | * be mindful of the maximum number of retries specified | |
1797 | * and not get stuck in a loop. | |
1798 | */ | |
1799 | case DID_SOFT_ERROR: | |
1800 | goto maybe_retry; | |
1801 | case DID_IMM_RETRY: | |
1802 | return NEEDS_RETRY; | |
1803 | ||
bf341919 | 1804 | case DID_REQUEUE: |
1805 | return ADD_TO_MLQUEUE; | |
a4dfaa6f MC |
1806 | case DID_TRANSPORT_DISRUPTED: |
1807 | /* | |
1808 | * LLD/transport was disrupted during processing of the IO. | |
1809 | * The transport class is now blocked/blocking, | |
1810 | * and the transport will decide what to do with the IO | |
939c2288 MC |
1811 | * based on its timers and recovery capablilities if |
1812 | * there are enough retries. | |
a4dfaa6f | 1813 | */ |
939c2288 | 1814 | goto maybe_retry; |
a4dfaa6f MC |
1815 | case DID_TRANSPORT_FAILFAST: |
1816 | /* | |
1817 | * The transport decided to failfast the IO (most likely | |
1818 | * the fast io fail tmo fired), so send IO directly upwards. | |
1819 | */ | |
1820 | return SUCCESS; | |
1da177e4 LT |
1821 | case DID_ERROR: |
1822 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1823 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1824 | /* | |
1825 | * execute reservation conflict processing code | |
1826 | * lower down | |
1827 | */ | |
1828 | break; | |
1829 | /* fallthrough */ | |
1da177e4 LT |
1830 | case DID_BUS_BUSY: |
1831 | case DID_PARITY: | |
1832 | goto maybe_retry; | |
1833 | case DID_TIME_OUT: | |
1834 | /* | |
1835 | * when we scan the bus, we get timeout messages for | |
1836 | * these commands if there is no device available. | |
1837 | * other hosts report did_no_connect for the same thing. | |
1838 | */ | |
1839 | if ((scmd->cmnd[0] == TEST_UNIT_READY || | |
1840 | scmd->cmnd[0] == INQUIRY)) { | |
1841 | return SUCCESS; | |
1842 | } else { | |
1843 | return FAILED; | |
1844 | } | |
1845 | case DID_RESET: | |
1846 | return SUCCESS; | |
1847 | default: | |
1848 | return FAILED; | |
1849 | } | |
1850 | ||
1851 | /* | |
1852 | * next, check the message byte. | |
1853 | */ | |
1854 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
1855 | return FAILED; | |
1856 | ||
1857 | /* | |
1858 | * check the status byte to see if this indicates anything special. | |
1859 | */ | |
1860 | switch (status_byte(scmd->result)) { | |
1861 | case QUEUE_FULL: | |
42a6a918 | 1862 | scsi_handle_queue_full(scmd->device); |
1da177e4 LT |
1863 | /* |
1864 | * the case of trying to send too many commands to a | |
1865 | * tagged queueing device. | |
1866 | */ | |
1867 | case BUSY: | |
1868 | /* | |
1869 | * device can't talk to us at the moment. Should only | |
1870 | * occur (SAM-3) when the task queue is empty, so will cause | |
1871 | * the empty queue handling to trigger a stall in the | |
1872 | * device. | |
1873 | */ | |
1874 | return ADD_TO_MLQUEUE; | |
1875 | case GOOD: | |
279afdfe EM |
1876 | if (scmd->cmnd[0] == REPORT_LUNS) |
1877 | scmd->device->sdev_target->expecting_lun_change = 0; | |
4a84067d | 1878 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 | 1879 | case COMMAND_TERMINATED: |
1da177e4 | 1880 | return SUCCESS; |
a9b589d9 VB |
1881 | case TASK_ABORTED: |
1882 | goto maybe_retry; | |
1da177e4 LT |
1883 | case CHECK_CONDITION: |
1884 | rtn = scsi_check_sense(scmd); | |
1885 | if (rtn == NEEDS_RETRY) | |
1886 | goto maybe_retry; | |
1887 | /* if rtn == FAILED, we have no sense information; | |
1888 | * returning FAILED will wake the error handler thread | |
1889 | * to collect the sense and redo the decide | |
1890 | * disposition */ | |
1891 | return rtn; | |
1892 | case CONDITION_GOOD: | |
1893 | case INTERMEDIATE_GOOD: | |
1894 | case INTERMEDIATE_C_GOOD: | |
1895 | case ACA_ACTIVE: | |
1896 | /* | |
1897 | * who knows? FIXME(eric) | |
1898 | */ | |
1899 | return SUCCESS; | |
1900 | ||
1901 | case RESERVATION_CONFLICT: | |
9ccfc756 JB |
1902 | sdev_printk(KERN_INFO, scmd->device, |
1903 | "reservation conflict\n"); | |
2082ebc4 | 1904 | set_host_byte(scmd, DID_NEXUS_FAILURE); |
1da177e4 LT |
1905 | return SUCCESS; /* causes immediate i/o error */ |
1906 | default: | |
1907 | return FAILED; | |
1908 | } | |
1909 | return FAILED; | |
1910 | ||
1911 | maybe_retry: | |
1912 | ||
1913 | /* we requeue for retry because the error was retryable, and | |
1914 | * the request was not marked fast fail. Note that above, | |
1915 | * even if the request is marked fast fail, we still requeue | |
1916 | * for queue congestion conditions (QUEUE_FULL or BUSY) */ | |
8884efab | 1917 | if ((++scmd->retries) <= scmd->allowed |
4a27446f | 1918 | && !scsi_noretry_cmd(scmd)) { |
1da177e4 LT |
1919 | return NEEDS_RETRY; |
1920 | } else { | |
1921 | /* | |
1922 | * no more retries - report this one back to upper level. | |
1923 | */ | |
1924 | return SUCCESS; | |
1925 | } | |
1926 | } | |
1927 | ||
f078727b FT |
1928 | static void eh_lock_door_done(struct request *req, int uptodate) |
1929 | { | |
1930 | __blk_put_request(req->q, req); | |
1931 | } | |
1932 | ||
1da177e4 LT |
1933 | /** |
1934 | * scsi_eh_lock_door - Prevent medium removal for the specified device | |
1935 | * @sdev: SCSI device to prevent medium removal | |
1936 | * | |
1937 | * Locking: | |
91bc31fb | 1938 | * We must be called from process context. |
1da177e4 LT |
1939 | * |
1940 | * Notes: | |
1941 | * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the | |
1942 | * head of the devices request queue, and continue. | |
dc8875e1 | 1943 | */ |
1da177e4 LT |
1944 | static void scsi_eh_lock_door(struct scsi_device *sdev) |
1945 | { | |
f078727b | 1946 | struct request *req; |
1da177e4 | 1947 | |
91bc31fb JB |
1948 | /* |
1949 | * blk_get_request with GFP_KERNEL (__GFP_WAIT) sleeps until a | |
1950 | * request becomes available | |
1951 | */ | |
f078727b | 1952 | req = blk_get_request(sdev->request_queue, READ, GFP_KERNEL); |
1da177e4 | 1953 | |
f078727b FT |
1954 | req->cmd[0] = ALLOW_MEDIUM_REMOVAL; |
1955 | req->cmd[1] = 0; | |
1956 | req->cmd[2] = 0; | |
1957 | req->cmd[3] = 0; | |
1958 | req->cmd[4] = SCSI_REMOVAL_PREVENT; | |
1959 | req->cmd[5] = 0; | |
1da177e4 | 1960 | |
f078727b FT |
1961 | req->cmd_len = COMMAND_SIZE(req->cmd[0]); |
1962 | ||
1963 | req->cmd_type = REQ_TYPE_BLOCK_PC; | |
1964 | req->cmd_flags |= REQ_QUIET; | |
1965 | req->timeout = 10 * HZ; | |
1966 | req->retries = 5; | |
1967 | ||
1968 | blk_execute_rq_nowait(req->q, NULL, req, 1, eh_lock_door_done); | |
1969 | } | |
1da177e4 LT |
1970 | |
1971 | /** | |
1972 | * scsi_restart_operations - restart io operations to the specified host. | |
1973 | * @shost: Host we are restarting. | |
1974 | * | |
1975 | * Notes: | |
1976 | * When we entered the error handler, we blocked all further i/o to | |
1977 | * this device. we need to 'reverse' this process. | |
dc8875e1 | 1978 | */ |
1da177e4 LT |
1979 | static void scsi_restart_operations(struct Scsi_Host *shost) |
1980 | { | |
1981 | struct scsi_device *sdev; | |
939647ee | 1982 | unsigned long flags; |
1da177e4 LT |
1983 | |
1984 | /* | |
1985 | * If the door was locked, we need to insert a door lock request | |
1986 | * onto the head of the SCSI request queue for the device. There | |
1987 | * is no point trying to lock the door of an off-line device. | |
1988 | */ | |
1989 | shost_for_each_device(sdev, shost) { | |
1990 | if (scsi_device_online(sdev) && sdev->locked) | |
1991 | scsi_eh_lock_door(sdev); | |
1992 | } | |
1993 | ||
1994 | /* | |
1995 | * next free up anything directly waiting upon the host. this | |
1996 | * will be requests for character device operations, and also for | |
1997 | * ioctls to queued block devices. | |
1998 | */ | |
b4562022 HR |
1999 | SCSI_LOG_ERROR_RECOVERY(3, |
2000 | printk("scsi_eh_%d waking up host to restart\n", | |
2001 | shost->host_no)); | |
1da177e4 | 2002 | |
939647ee JB |
2003 | spin_lock_irqsave(shost->host_lock, flags); |
2004 | if (scsi_host_set_state(shost, SHOST_RUNNING)) | |
2005 | if (scsi_host_set_state(shost, SHOST_CANCEL)) | |
2006 | BUG_ON(scsi_host_set_state(shost, SHOST_DEL)); | |
2007 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
2008 | |
2009 | wake_up(&shost->host_wait); | |
2010 | ||
2011 | /* | |
2012 | * finally we need to re-initiate requests that may be pending. we will | |
2013 | * have had everything blocked while error handling is taking place, and | |
2014 | * now that error recovery is done, we will need to ensure that these | |
2015 | * requests are started. | |
2016 | */ | |
2017 | scsi_run_host_queues(shost); | |
57fc2e33 DW |
2018 | |
2019 | /* | |
2020 | * if eh is active and host_eh_scheduled is pending we need to re-run | |
2021 | * recovery. we do this check after scsi_run_host_queues() to allow | |
2022 | * everything pent up since the last eh run a chance to make forward | |
2023 | * progress before we sync again. Either we'll immediately re-run | |
2024 | * recovery or scsi_device_unbusy() will wake us again when these | |
2025 | * pending commands complete. | |
2026 | */ | |
2027 | spin_lock_irqsave(shost->host_lock, flags); | |
2028 | if (shost->host_eh_scheduled) | |
2029 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) | |
2030 | WARN_ON(scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)); | |
2031 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
2032 | } |
2033 | ||
2034 | /** | |
2035 | * scsi_eh_ready_devs - check device ready state and recover if not. | |
2036 | * @shost: host to be recovered. | |
eb44820c RL |
2037 | * @work_q: &list_head for pending commands. |
2038 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 2039 | */ |
dca84e46 DW |
2040 | void scsi_eh_ready_devs(struct Scsi_Host *shost, |
2041 | struct list_head *work_q, | |
2042 | struct list_head *done_q) | |
1da177e4 LT |
2043 | { |
2044 | if (!scsi_eh_stu(shost, work_q, done_q)) | |
2045 | if (!scsi_eh_bus_device_reset(shost, work_q, done_q)) | |
30bd7df8 MC |
2046 | if (!scsi_eh_target_reset(shost, work_q, done_q)) |
2047 | if (!scsi_eh_bus_reset(shost, work_q, done_q)) | |
2048 | if (!scsi_eh_host_reset(work_q, done_q)) | |
2049 | scsi_eh_offline_sdevs(work_q, | |
2050 | done_q); | |
1da177e4 | 2051 | } |
dca84e46 | 2052 | EXPORT_SYMBOL_GPL(scsi_eh_ready_devs); |
1da177e4 LT |
2053 | |
2054 | /** | |
2055 | * scsi_eh_flush_done_q - finish processed commands or retry them. | |
2056 | * @done_q: list_head of processed commands. | |
dc8875e1 | 2057 | */ |
041c5fc3 | 2058 | void scsi_eh_flush_done_q(struct list_head *done_q) |
1da177e4 | 2059 | { |
937abeaa | 2060 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 2061 | |
937abeaa CH |
2062 | list_for_each_entry_safe(scmd, next, done_q, eh_entry) { |
2063 | list_del_init(&scmd->eh_entry); | |
1da177e4 | 2064 | if (scsi_device_online(scmd->device) && |
4a27446f | 2065 | !scsi_noretry_cmd(scmd) && |
8884efab | 2066 | (++scmd->retries <= scmd->allowed)) { |
1da177e4 LT |
2067 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush" |
2068 | " retry cmd: %p\n", | |
2069 | current->comm, | |
2070 | scmd)); | |
2071 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); | |
2072 | } else { | |
793698ce PM |
2073 | /* |
2074 | * If just we got sense for the device (called | |
2075 | * scsi_eh_get_sense), scmd->result is already | |
2076 | * set, do not set DRIVER_TIMEOUT. | |
2077 | */ | |
1da177e4 LT |
2078 | if (!scmd->result) |
2079 | scmd->result |= (DRIVER_TIMEOUT << 24); | |
2080 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush finish" | |
2081 | " cmd: %p\n", | |
2082 | current->comm, scmd)); | |
2083 | scsi_finish_command(scmd); | |
2084 | } | |
2085 | } | |
2086 | } | |
041c5fc3 | 2087 | EXPORT_SYMBOL(scsi_eh_flush_done_q); |
1da177e4 LT |
2088 | |
2089 | /** | |
2090 | * scsi_unjam_host - Attempt to fix a host which has a cmd that failed. | |
2091 | * @shost: Host to unjam. | |
2092 | * | |
2093 | * Notes: | |
2094 | * When we come in here, we *know* that all commands on the bus have | |
2095 | * either completed, failed or timed out. we also know that no further | |
2096 | * commands are being sent to the host, so things are relatively quiet | |
2097 | * and we have freedom to fiddle with things as we wish. | |
2098 | * | |
2099 | * This is only the *default* implementation. it is possible for | |
2100 | * individual drivers to supply their own version of this function, and | |
2101 | * if the maintainer wishes to do this, it is strongly suggested that | |
2102 | * this function be taken as a template and modified. this function | |
2103 | * was designed to correctly handle problems for about 95% of the | |
2104 | * different cases out there, and it should always provide at least a | |
2105 | * reasonable amount of error recovery. | |
2106 | * | |
2107 | * Any command marked 'failed' or 'timeout' must eventually have | |
2108 | * scsi_finish_cmd() called for it. we do all of the retry stuff | |
2109 | * here, so when we restart the host after we return it should have an | |
2110 | * empty queue. | |
dc8875e1 | 2111 | */ |
1da177e4 LT |
2112 | static void scsi_unjam_host(struct Scsi_Host *shost) |
2113 | { | |
2114 | unsigned long flags; | |
2115 | LIST_HEAD(eh_work_q); | |
2116 | LIST_HEAD(eh_done_q); | |
2117 | ||
2118 | spin_lock_irqsave(shost->host_lock, flags); | |
2119 | list_splice_init(&shost->eh_cmd_q, &eh_work_q); | |
2120 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2121 | ||
2122 | SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost, &eh_work_q)); | |
2123 | ||
2124 | if (!scsi_eh_get_sense(&eh_work_q, &eh_done_q)) | |
2125 | if (!scsi_eh_abort_cmds(&eh_work_q, &eh_done_q)) | |
2126 | scsi_eh_ready_devs(shost, &eh_work_q, &eh_done_q); | |
2127 | ||
b4562022 | 2128 | spin_lock_irqsave(shost->host_lock, flags); |
bb3b621a | 2129 | if (shost->eh_deadline != -1) |
b4562022 HR |
2130 | shost->last_reset = 0; |
2131 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
2132 | scsi_eh_flush_done_q(&eh_done_q); |
2133 | } | |
2134 | ||
2135 | /** | |
ad42eb1b | 2136 | * scsi_error_handler - SCSI error handler thread |
1da177e4 LT |
2137 | * @data: Host for which we are running. |
2138 | * | |
2139 | * Notes: | |
ad42eb1b CH |
2140 | * This is the main error handling loop. This is run as a kernel thread |
2141 | * for every SCSI host and handles all error handling activity. | |
dc8875e1 | 2142 | */ |
1da177e4 LT |
2143 | int scsi_error_handler(void *data) |
2144 | { | |
ad42eb1b | 2145 | struct Scsi_Host *shost = data; |
1da177e4 | 2146 | |
1da177e4 | 2147 | /* |
ad42eb1b CH |
2148 | * We use TASK_INTERRUPTIBLE so that the thread is not |
2149 | * counted against the load average as a running process. | |
2150 | * We never actually get interrupted because kthread_run | |
c03264a7 | 2151 | * disables signal delivery for the created thread. |
1da177e4 | 2152 | */ |
3ed7a470 | 2153 | while (!kthread_should_stop()) { |
b9d5c6b7 | 2154 | set_current_state(TASK_INTERRUPTIBLE); |
ee7863bc | 2155 | if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) || |
3ed7a470 | 2156 | shost->host_failed != shost->host_busy) { |
ad42eb1b | 2157 | SCSI_LOG_ERROR_RECOVERY(1, |
b4562022 | 2158 | printk("scsi_eh_%d: sleeping\n", |
ad42eb1b | 2159 | shost->host_no)); |
3ed7a470 | 2160 | schedule(); |
3ed7a470 JB |
2161 | continue; |
2162 | } | |
1da177e4 | 2163 | |
3ed7a470 | 2164 | __set_current_state(TASK_RUNNING); |
ad42eb1b | 2165 | SCSI_LOG_ERROR_RECOVERY(1, |
b4562022 HR |
2166 | printk("scsi_eh_%d: waking up %d/%d/%d\n", |
2167 | shost->host_no, shost->host_eh_scheduled, | |
2168 | shost->host_failed, shost->host_busy)); | |
1da177e4 | 2169 | |
1da177e4 LT |
2170 | /* |
2171 | * We have a host that is failing for some reason. Figure out | |
2172 | * what we need to do to get it up and online again (if we can). | |
2173 | * If we fail, we end up taking the thing offline. | |
2174 | */ | |
ae0751ff | 2175 | if (!shost->eh_noresume && scsi_autopm_get_host(shost) != 0) { |
bc4f2401 AS |
2176 | SCSI_LOG_ERROR_RECOVERY(1, |
2177 | printk(KERN_ERR "Error handler scsi_eh_%d " | |
2178 | "unable to autoresume\n", | |
2179 | shost->host_no)); | |
2180 | continue; | |
2181 | } | |
2182 | ||
9227c33d CH |
2183 | if (shost->transportt->eh_strategy_handler) |
2184 | shost->transportt->eh_strategy_handler(shost); | |
1da177e4 LT |
2185 | else |
2186 | scsi_unjam_host(shost); | |
2187 | ||
1da177e4 LT |
2188 | /* |
2189 | * Note - if the above fails completely, the action is to take | |
2190 | * individual devices offline and flush the queue of any | |
2191 | * outstanding requests that may have been pending. When we | |
2192 | * restart, we restart any I/O to any other devices on the bus | |
2193 | * which are still online. | |
2194 | */ | |
2195 | scsi_restart_operations(shost); | |
ae0751ff LM |
2196 | if (!shost->eh_noresume) |
2197 | scsi_autopm_put_host(shost); | |
1da177e4 | 2198 | } |
461a0ffb SR |
2199 | __set_current_state(TASK_RUNNING); |
2200 | ||
ad42eb1b CH |
2201 | SCSI_LOG_ERROR_RECOVERY(1, |
2202 | printk("Error handler scsi_eh_%d exiting\n", shost->host_no)); | |
3ed7a470 | 2203 | shost->ehandler = NULL; |
1da177e4 LT |
2204 | return 0; |
2205 | } | |
2206 | ||
2207 | /* | |
2208 | * Function: scsi_report_bus_reset() | |
2209 | * | |
2210 | * Purpose: Utility function used by low-level drivers to report that | |
2211 | * they have observed a bus reset on the bus being handled. | |
2212 | * | |
2213 | * Arguments: shost - Host in question | |
2214 | * channel - channel on which reset was observed. | |
2215 | * | |
2216 | * Returns: Nothing | |
2217 | * | |
2218 | * Lock status: Host lock must be held. | |
2219 | * | |
2220 | * Notes: This only needs to be called if the reset is one which | |
2221 | * originates from an unknown location. Resets originated | |
2222 | * by the mid-level itself don't need to call this, but there | |
2223 | * should be no harm. | |
2224 | * | |
2225 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
2226 | * is properly treated. | |
2227 | */ | |
2228 | void scsi_report_bus_reset(struct Scsi_Host *shost, int channel) | |
2229 | { | |
2230 | struct scsi_device *sdev; | |
2231 | ||
2232 | __shost_for_each_device(sdev, shost) { | |
30bd7df8 MC |
2233 | if (channel == sdev_channel(sdev)) |
2234 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
2235 | } |
2236 | } | |
2237 | EXPORT_SYMBOL(scsi_report_bus_reset); | |
2238 | ||
2239 | /* | |
2240 | * Function: scsi_report_device_reset() | |
2241 | * | |
2242 | * Purpose: Utility function used by low-level drivers to report that | |
2243 | * they have observed a device reset on the device being handled. | |
2244 | * | |
2245 | * Arguments: shost - Host in question | |
2246 | * channel - channel on which reset was observed | |
2247 | * target - target on which reset was observed | |
2248 | * | |
2249 | * Returns: Nothing | |
2250 | * | |
2251 | * Lock status: Host lock must be held | |
2252 | * | |
2253 | * Notes: This only needs to be called if the reset is one which | |
2254 | * originates from an unknown location. Resets originated | |
2255 | * by the mid-level itself don't need to call this, but there | |
2256 | * should be no harm. | |
2257 | * | |
2258 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
2259 | * is properly treated. | |
2260 | */ | |
2261 | void scsi_report_device_reset(struct Scsi_Host *shost, int channel, int target) | |
2262 | { | |
2263 | struct scsi_device *sdev; | |
2264 | ||
2265 | __shost_for_each_device(sdev, shost) { | |
422c0d61 | 2266 | if (channel == sdev_channel(sdev) && |
30bd7df8 MC |
2267 | target == sdev_id(sdev)) |
2268 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
2269 | } |
2270 | } | |
2271 | EXPORT_SYMBOL(scsi_report_device_reset); | |
2272 | ||
2273 | static void | |
2274 | scsi_reset_provider_done_command(struct scsi_cmnd *scmd) | |
2275 | { | |
2276 | } | |
2277 | ||
2278 | /* | |
2279 | * Function: scsi_reset_provider | |
2280 | * | |
2281 | * Purpose: Send requested reset to a bus or device at any phase. | |
2282 | * | |
2283 | * Arguments: device - device to send reset to | |
2284 | * flag - reset type (see scsi.h) | |
2285 | * | |
2286 | * Returns: SUCCESS/FAILURE. | |
2287 | * | |
2288 | * Notes: This is used by the SCSI Generic driver to provide | |
2289 | * Bus/Device reset capability. | |
2290 | */ | |
2291 | int | |
2292 | scsi_reset_provider(struct scsi_device *dev, int flag) | |
2293 | { | |
bc4f2401 | 2294 | struct scsi_cmnd *scmd; |
d7a1bb0a | 2295 | struct Scsi_Host *shost = dev->host; |
1da177e4 | 2296 | struct request req; |
d7a1bb0a | 2297 | unsigned long flags; |
1da177e4 LT |
2298 | int rtn; |
2299 | ||
bc4f2401 AS |
2300 | if (scsi_autopm_get_host(shost) < 0) |
2301 | return FAILED; | |
2302 | ||
04796336 CH |
2303 | if (!get_device(&dev->sdev_gendev)) { |
2304 | rtn = FAILED; | |
2305 | goto out_put_autopm_host; | |
2306 | } | |
2307 | ||
bc4f2401 | 2308 | scmd = scsi_get_command(dev, GFP_KERNEL); |
95eeb5f5 CH |
2309 | if (!scmd) { |
2310 | rtn = FAILED; | |
2311 | put_device(&dev->sdev_gendev); | |
2312 | goto out_put_autopm_host; | |
2313 | } | |
2314 | ||
4f54eec8 | 2315 | blk_rq_init(NULL, &req); |
1da177e4 | 2316 | scmd->request = &req; |
b4edcbca | 2317 | |
64a87b24 BH |
2318 | scmd->cmnd = req.cmd; |
2319 | ||
1da177e4 | 2320 | scmd->scsi_done = scsi_reset_provider_done_command; |
30b0c37b | 2321 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
1da177e4 LT |
2322 | |
2323 | scmd->cmd_len = 0; | |
2324 | ||
2325 | scmd->sc_data_direction = DMA_BIDIRECTIONAL; | |
1da177e4 | 2326 | |
d7a1bb0a JS |
2327 | spin_lock_irqsave(shost->host_lock, flags); |
2328 | shost->tmf_in_progress = 1; | |
2329 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2330 | ||
1da177e4 LT |
2331 | switch (flag) { |
2332 | case SCSI_TRY_RESET_DEVICE: | |
2333 | rtn = scsi_try_bus_device_reset(scmd); | |
2334 | if (rtn == SUCCESS) | |
2335 | break; | |
2336 | /* FALLTHROUGH */ | |
30bd7df8 MC |
2337 | case SCSI_TRY_RESET_TARGET: |
2338 | rtn = scsi_try_target_reset(scmd); | |
2339 | if (rtn == SUCCESS) | |
2340 | break; | |
2341 | /* FALLTHROUGH */ | |
1da177e4 LT |
2342 | case SCSI_TRY_RESET_BUS: |
2343 | rtn = scsi_try_bus_reset(scmd); | |
2344 | if (rtn == SUCCESS) | |
2345 | break; | |
2346 | /* FALLTHROUGH */ | |
2347 | case SCSI_TRY_RESET_HOST: | |
2348 | rtn = scsi_try_host_reset(scmd); | |
2349 | break; | |
2350 | default: | |
2351 | rtn = FAILED; | |
2352 | } | |
2353 | ||
d7a1bb0a JS |
2354 | spin_lock_irqsave(shost->host_lock, flags); |
2355 | shost->tmf_in_progress = 0; | |
2356 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2357 | ||
2358 | /* | |
2359 | * be sure to wake up anyone who was sleeping or had their queue | |
2360 | * suspended while we performed the TMF. | |
2361 | */ | |
2362 | SCSI_LOG_ERROR_RECOVERY(3, | |
2363 | printk("%s: waking up host to restart after TMF\n", | |
cadbd4a5 | 2364 | __func__)); |
d7a1bb0a JS |
2365 | |
2366 | wake_up(&shost->host_wait); | |
2367 | ||
2368 | scsi_run_host_queues(shost); | |
2369 | ||
1da177e4 | 2370 | scsi_next_command(scmd); |
04796336 | 2371 | out_put_autopm_host: |
bc4f2401 | 2372 | scsi_autopm_put_host(shost); |
1da177e4 LT |
2373 | return rtn; |
2374 | } | |
2375 | EXPORT_SYMBOL(scsi_reset_provider); | |
2376 | ||
2377 | /** | |
2378 | * scsi_normalize_sense - normalize main elements from either fixed or | |
2379 | * descriptor sense data format into a common format. | |
2380 | * | |
2381 | * @sense_buffer: byte array containing sense data returned by device | |
2382 | * @sb_len: number of valid bytes in sense_buffer | |
2383 | * @sshdr: pointer to instance of structure that common | |
2384 | * elements are written to. | |
2385 | * | |
2386 | * Notes: | |
2387 | * The "main elements" from sense data are: response_code, sense_key, | |
2388 | * asc, ascq and additional_length (only for descriptor format). | |
2389 | * | |
2390 | * Typically this function can be called after a device has | |
2391 | * responded to a SCSI command with the CHECK_CONDITION status. | |
2392 | * | |
2393 | * Return value: | |
2394 | * 1 if valid sense data information found, else 0; | |
dc8875e1 | 2395 | */ |
1da177e4 LT |
2396 | int scsi_normalize_sense(const u8 *sense_buffer, int sb_len, |
2397 | struct scsi_sense_hdr *sshdr) | |
2398 | { | |
33aa687d | 2399 | if (!sense_buffer || !sb_len) |
1da177e4 LT |
2400 | return 0; |
2401 | ||
2402 | memset(sshdr, 0, sizeof(struct scsi_sense_hdr)); | |
2403 | ||
2404 | sshdr->response_code = (sense_buffer[0] & 0x7f); | |
33aa687d JB |
2405 | |
2406 | if (!scsi_sense_valid(sshdr)) | |
2407 | return 0; | |
2408 | ||
1da177e4 LT |
2409 | if (sshdr->response_code >= 0x72) { |
2410 | /* | |
2411 | * descriptor format | |
2412 | */ | |
2413 | if (sb_len > 1) | |
2414 | sshdr->sense_key = (sense_buffer[1] & 0xf); | |
2415 | if (sb_len > 2) | |
2416 | sshdr->asc = sense_buffer[2]; | |
2417 | if (sb_len > 3) | |
2418 | sshdr->ascq = sense_buffer[3]; | |
2419 | if (sb_len > 7) | |
2420 | sshdr->additional_length = sense_buffer[7]; | |
2421 | } else { | |
0bf8c869 | 2422 | /* |
1da177e4 LT |
2423 | * fixed format |
2424 | */ | |
2425 | if (sb_len > 2) | |
2426 | sshdr->sense_key = (sense_buffer[2] & 0xf); | |
2427 | if (sb_len > 7) { | |
2428 | sb_len = (sb_len < (sense_buffer[7] + 8)) ? | |
2429 | sb_len : (sense_buffer[7] + 8); | |
2430 | if (sb_len > 12) | |
2431 | sshdr->asc = sense_buffer[12]; | |
2432 | if (sb_len > 13) | |
2433 | sshdr->ascq = sense_buffer[13]; | |
2434 | } | |
2435 | } | |
2436 | ||
2437 | return 1; | |
2438 | } | |
2439 | EXPORT_SYMBOL(scsi_normalize_sense); | |
2440 | ||
1da177e4 LT |
2441 | int scsi_command_normalize_sense(struct scsi_cmnd *cmd, |
2442 | struct scsi_sense_hdr *sshdr) | |
2443 | { | |
2444 | return scsi_normalize_sense(cmd->sense_buffer, | |
b80ca4f7 | 2445 | SCSI_SENSE_BUFFERSIZE, sshdr); |
1da177e4 LT |
2446 | } |
2447 | EXPORT_SYMBOL(scsi_command_normalize_sense); | |
2448 | ||
2449 | /** | |
eb44820c | 2450 | * scsi_sense_desc_find - search for a given descriptor type in descriptor sense data format. |
1da177e4 LT |
2451 | * @sense_buffer: byte array of descriptor format sense data |
2452 | * @sb_len: number of valid bytes in sense_buffer | |
2453 | * @desc_type: value of descriptor type to find | |
2454 | * (e.g. 0 -> information) | |
2455 | * | |
2456 | * Notes: | |
2457 | * only valid when sense data is in descriptor format | |
2458 | * | |
2459 | * Return value: | |
2460 | * pointer to start of (first) descriptor if found else NULL | |
dc8875e1 | 2461 | */ |
1da177e4 LT |
2462 | const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len, |
2463 | int desc_type) | |
2464 | { | |
2465 | int add_sen_len, add_len, desc_len, k; | |
2466 | const u8 * descp; | |
2467 | ||
2468 | if ((sb_len < 8) || (0 == (add_sen_len = sense_buffer[7]))) | |
2469 | return NULL; | |
2470 | if ((sense_buffer[0] < 0x72) || (sense_buffer[0] > 0x73)) | |
2471 | return NULL; | |
2472 | add_sen_len = (add_sen_len < (sb_len - 8)) ? | |
2473 | add_sen_len : (sb_len - 8); | |
2474 | descp = &sense_buffer[8]; | |
2475 | for (desc_len = 0, k = 0; k < add_sen_len; k += desc_len) { | |
2476 | descp += desc_len; | |
2477 | add_len = (k < (add_sen_len - 1)) ? descp[1]: -1; | |
2478 | desc_len = add_len + 2; | |
2479 | if (descp[0] == desc_type) | |
2480 | return descp; | |
2481 | if (add_len < 0) // short descriptor ?? | |
2482 | break; | |
2483 | } | |
2484 | return NULL; | |
2485 | } | |
2486 | EXPORT_SYMBOL(scsi_sense_desc_find); | |
2487 | ||
2488 | /** | |
eb44820c | 2489 | * scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor format) |
1da177e4 LT |
2490 | * @sense_buffer: byte array of sense data |
2491 | * @sb_len: number of valid bytes in sense_buffer | |
2492 | * @info_out: pointer to 64 integer where 8 or 4 byte information | |
2493 | * field will be placed if found. | |
2494 | * | |
2495 | * Return value: | |
2496 | * 1 if information field found, 0 if not found. | |
dc8875e1 | 2497 | */ |
1da177e4 LT |
2498 | int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len, |
2499 | u64 * info_out) | |
2500 | { | |
2501 | int j; | |
2502 | const u8 * ucp; | |
2503 | u64 ull; | |
2504 | ||
2505 | if (sb_len < 7) | |
2506 | return 0; | |
2507 | switch (sense_buffer[0] & 0x7f) { | |
2508 | case 0x70: | |
2509 | case 0x71: | |
2510 | if (sense_buffer[0] & 0x80) { | |
2511 | *info_out = (sense_buffer[3] << 24) + | |
2512 | (sense_buffer[4] << 16) + | |
2513 | (sense_buffer[5] << 8) + sense_buffer[6]; | |
2514 | return 1; | |
2515 | } else | |
2516 | return 0; | |
2517 | case 0x72: | |
2518 | case 0x73: | |
2519 | ucp = scsi_sense_desc_find(sense_buffer, sb_len, | |
2520 | 0 /* info desc */); | |
2521 | if (ucp && (0xa == ucp[1])) { | |
2522 | ull = 0; | |
2523 | for (j = 0; j < 8; ++j) { | |
2524 | if (j > 0) | |
2525 | ull <<= 8; | |
2526 | ull |= ucp[4 + j]; | |
2527 | } | |
2528 | *info_out = ull; | |
2529 | return 1; | |
2530 | } else | |
2531 | return 0; | |
2532 | default: | |
2533 | return 0; | |
2534 | } | |
2535 | } | |
2536 | EXPORT_SYMBOL(scsi_get_sense_info_fld); | |
3bc6a261 FT |
2537 | |
2538 | /** | |
2539 | * scsi_build_sense_buffer - build sense data in a buffer | |
2540 | * @desc: Sense format (non zero == descriptor format, | |
2541 | * 0 == fixed format) | |
2542 | * @buf: Where to build sense data | |
2543 | * @key: Sense key | |
2544 | * @asc: Additional sense code | |
2545 | * @ascq: Additional sense code qualifier | |
2546 | * | |
2547 | **/ | |
2548 | void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq) | |
2549 | { | |
2550 | if (desc) { | |
2551 | buf[0] = 0x72; /* descriptor, current */ | |
2552 | buf[1] = key; | |
2553 | buf[2] = asc; | |
2554 | buf[3] = ascq; | |
2555 | buf[7] = 0; | |
2556 | } else { | |
2557 | buf[0] = 0x70; /* fixed, current */ | |
2558 | buf[2] = key; | |
2559 | buf[7] = 0xa; | |
2560 | buf[12] = asc; | |
2561 | buf[13] = ascq; | |
2562 | } | |
2563 | } | |
2564 | EXPORT_SYMBOL(scsi_build_sense_buffer); |