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