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1da177e4 LT |
1 | /* |
2 | * scsi_error.c Copyright (C) 1997 Eric Youngdale | |
3 | * | |
4 | * SCSI error/timeout handling | |
5 | * Initial versions: Eric Youngdale. Based upon conversations with | |
0bf8c869 | 6 | * Leonard Zubkoff and David Miller at Linux Expo, |
1da177e4 LT |
7 | * ideas originating from all over the place. |
8 | * | |
9 | * Restructured scsi_unjam_host and associated functions. | |
10 | * September 04, 2002 Mike Anderson (andmike@us.ibm.com) | |
11 | * | |
12 | * Forward port of Russell King's (rmk@arm.linux.org.uk) changes and | |
0bf8c869 | 13 | * minor cleanups. |
1da177e4 LT |
14 | * September 30, 2002 Mike Anderson (andmike@us.ibm.com) |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/sched.h> | |
5a0e3ad6 | 19 | #include <linux/gfp.h> |
1da177e4 LT |
20 | #include <linux/timer.h> |
21 | #include <linux/string.h> | |
1da177e4 | 22 | #include <linux/kernel.h> |
83144186 | 23 | #include <linux/freezer.h> |
c5478def | 24 | #include <linux/kthread.h> |
1da177e4 LT |
25 | #include <linux/interrupt.h> |
26 | #include <linux/blkdev.h> | |
27 | #include <linux/delay.h> | |
fc73648a | 28 | #include <linux/jiffies.h> |
1da177e4 LT |
29 | |
30 | #include <scsi/scsi.h> | |
beb40487 | 31 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
32 | #include <scsi/scsi_dbg.h> |
33 | #include <scsi/scsi_device.h> | |
18a4d0a2 | 34 | #include <scsi/scsi_driver.h> |
1da177e4 | 35 | #include <scsi/scsi_eh.h> |
7708c165 | 36 | #include <scsi/scsi_common.h> |
c829c394 | 37 | #include <scsi/scsi_transport.h> |
1da177e4 LT |
38 | #include <scsi/scsi_host.h> |
39 | #include <scsi/scsi_ioctl.h> | |
ee14c674 | 40 | #include <scsi/scsi_dh.h> |
176aa9d6 | 41 | #include <scsi/sg.h> |
1da177e4 LT |
42 | |
43 | #include "scsi_priv.h" | |
44 | #include "scsi_logging.h" | |
79ee8304 | 45 | #include "scsi_transport_api.h" |
1da177e4 | 46 | |
bf816235 KT |
47 | #include <trace/events/scsi.h> |
48 | ||
2908769c DLM |
49 | #include <asm/unaligned.h> |
50 | ||
14216561 JB |
51 | static void scsi_eh_done(struct scsi_cmnd *scmd); |
52 | ||
1da177e4 LT |
53 | /* |
54 | * These should *probably* be handled by the host itself. | |
55 | * Since it is allowed to sleep, it probably should. | |
56 | */ | |
57 | #define BUS_RESET_SETTLE_TIME (10) | |
58 | #define HOST_RESET_SETTLE_TIME (10) | |
59 | ||
3eef6257 | 60 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd); |
e494f6a7 HR |
61 | static int scsi_try_to_abort_cmd(struct scsi_host_template *, |
62 | struct scsi_cmnd *); | |
3eef6257 | 63 | |
1da177e4 LT |
64 | /* called with shost->host_lock held */ |
65 | void scsi_eh_wakeup(struct Scsi_Host *shost) | |
66 | { | |
74665016 | 67 | if (atomic_read(&shost->host_busy) == shost->host_failed) { |
bf816235 | 68 | trace_scsi_eh_wakeup(shost); |
3ed7a470 | 69 | wake_up_process(shost->ehandler); |
91921e01 HR |
70 | SCSI_LOG_ERROR_RECOVERY(5, shost_printk(KERN_INFO, shost, |
71 | "Waking error handler thread\n")); | |
1da177e4 LT |
72 | } |
73 | } | |
f8bbfc24 TH |
74 | |
75 | /** | |
76 | * scsi_schedule_eh - schedule EH for SCSI host | |
77 | * @shost: SCSI host to invoke error handling on. | |
78 | * | |
79 | * Schedule SCSI EH without scmd. | |
dc8875e1 | 80 | */ |
f8bbfc24 TH |
81 | void scsi_schedule_eh(struct Scsi_Host *shost) |
82 | { | |
83 | unsigned long flags; | |
84 | ||
85 | spin_lock_irqsave(shost->host_lock, flags); | |
86 | ||
87 | if (scsi_host_set_state(shost, SHOST_RECOVERY) == 0 || | |
88 | scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY) == 0) { | |
89 | shost->host_eh_scheduled++; | |
90 | scsi_eh_wakeup(shost); | |
91 | } | |
92 | ||
93 | spin_unlock_irqrestore(shost->host_lock, flags); | |
94 | } | |
95 | EXPORT_SYMBOL_GPL(scsi_schedule_eh); | |
1da177e4 | 96 | |
b4562022 HR |
97 | static int scsi_host_eh_past_deadline(struct Scsi_Host *shost) |
98 | { | |
bb3b621a | 99 | if (!shost->last_reset || shost->eh_deadline == -1) |
b4562022 HR |
100 | return 0; |
101 | ||
76ad3e59 HR |
102 | /* |
103 | * 32bit accesses are guaranteed to be atomic | |
104 | * (on all supported architectures), so instead | |
105 | * of using a spinlock we can as well double check | |
bb3b621a | 106 | * if eh_deadline has been set to 'off' during the |
76ad3e59 HR |
107 | * time_before call. |
108 | */ | |
109 | if (time_before(jiffies, shost->last_reset + shost->eh_deadline) && | |
bb3b621a | 110 | shost->eh_deadline > -1) |
b4562022 HR |
111 | return 0; |
112 | ||
113 | return 1; | |
114 | } | |
115 | ||
e494f6a7 HR |
116 | /** |
117 | * scmd_eh_abort_handler - Handle command aborts | |
118 | * @work: command to be aborted. | |
119 | */ | |
120 | void | |
121 | scmd_eh_abort_handler(struct work_struct *work) | |
122 | { | |
123 | struct scsi_cmnd *scmd = | |
124 | container_of(work, struct scsi_cmnd, abort_work.work); | |
125 | struct scsi_device *sdev = scmd->device; | |
e494f6a7 HR |
126 | int rtn; |
127 | ||
e494f6a7 | 128 | if (scsi_host_eh_past_deadline(sdev->host)) { |
e494f6a7 HR |
129 | SCSI_LOG_ERROR_RECOVERY(3, |
130 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 131 | "eh timeout, not aborting\n")); |
e494f6a7 | 132 | } else { |
e494f6a7 HR |
133 | SCSI_LOG_ERROR_RECOVERY(3, |
134 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 135 | "aborting command\n")); |
e494f6a7 HR |
136 | rtn = scsi_try_to_abort_cmd(sdev->host->hostt, scmd); |
137 | if (rtn == SUCCESS) { | |
8922a908 | 138 | set_host_byte(scmd, DID_TIME_OUT); |
bb3b621a RM |
139 | if (scsi_host_eh_past_deadline(sdev->host)) { |
140 | SCSI_LOG_ERROR_RECOVERY(3, | |
141 | scmd_printk(KERN_INFO, scmd, | |
470613b4 HR |
142 | "eh timeout, not retrying " |
143 | "aborted command\n")); | |
bb3b621a | 144 | } else if (!scsi_noretry_cmd(scmd) && |
e494f6a7 HR |
145 | (++scmd->retries <= scmd->allowed)) { |
146 | SCSI_LOG_ERROR_RECOVERY(3, | |
147 | scmd_printk(KERN_WARNING, scmd, | |
470613b4 | 148 | "retry aborted command\n")); |
e494f6a7 | 149 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); |
bb3b621a | 150 | return; |
e494f6a7 HR |
151 | } else { |
152 | SCSI_LOG_ERROR_RECOVERY(3, | |
153 | scmd_printk(KERN_WARNING, scmd, | |
470613b4 | 154 | "finish aborted command\n")); |
e494f6a7 | 155 | scsi_finish_command(scmd); |
bb3b621a | 156 | return; |
e494f6a7 | 157 | } |
bb3b621a RM |
158 | } else { |
159 | SCSI_LOG_ERROR_RECOVERY(3, | |
160 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 161 | "cmd abort %s\n", |
883a030f HR |
162 | (rtn == FAST_IO_FAIL) ? |
163 | "not send" : "failed")); | |
e494f6a7 | 164 | } |
e494f6a7 HR |
165 | } |
166 | ||
a0658632 | 167 | scsi_eh_scmd_add(scmd); |
e494f6a7 HR |
168 | } |
169 | ||
170 | /** | |
171 | * scsi_abort_command - schedule a command abort | |
172 | * @scmd: scmd to abort. | |
173 | * | |
174 | * We only need to abort commands after a command timeout | |
175 | */ | |
176 | static int | |
177 | scsi_abort_command(struct scsi_cmnd *scmd) | |
178 | { | |
179 | struct scsi_device *sdev = scmd->device; | |
180 | struct Scsi_Host *shost = sdev->host; | |
181 | unsigned long flags; | |
182 | ||
183 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) { | |
184 | /* | |
185 | * Retry after abort failed, escalate to next level. | |
186 | */ | |
187 | SCSI_LOG_ERROR_RECOVERY(3, | |
188 | scmd_printk(KERN_INFO, scmd, | |
470613b4 | 189 | "previous abort failed\n")); |
fcc95a76 | 190 | BUG_ON(delayed_work_pending(&scmd->abort_work)); |
e494f6a7 HR |
191 | return FAILED; |
192 | } | |
193 | ||
e494f6a7 | 194 | spin_lock_irqsave(shost->host_lock, flags); |
bb3b621a | 195 | if (shost->eh_deadline != -1 && !shost->last_reset) |
e494f6a7 HR |
196 | shost->last_reset = jiffies; |
197 | spin_unlock_irqrestore(shost->host_lock, flags); | |
198 | ||
199 | scmd->eh_eflags |= SCSI_EH_ABORT_SCHEDULED; | |
200 | SCSI_LOG_ERROR_RECOVERY(3, | |
470613b4 | 201 | scmd_printk(KERN_INFO, scmd, "abort scheduled\n")); |
e494f6a7 HR |
202 | queue_delayed_work(shost->tmf_work_q, &scmd->abort_work, HZ / 100); |
203 | return SUCCESS; | |
204 | } | |
205 | ||
1da177e4 | 206 | /** |
7a38dc0b | 207 | * scsi_eh_reset - call into ->eh_action to reset internal counters |
1da177e4 | 208 | * @scmd: scmd to run eh on. |
1da177e4 | 209 | * |
7a38dc0b HR |
210 | * The scsi driver might be carrying internal state about the |
211 | * devices, so we need to call into the driver to reset the | |
212 | * internal state once the error handler is started. | |
dc8875e1 | 213 | */ |
7a38dc0b HR |
214 | static void scsi_eh_reset(struct scsi_cmnd *scmd) |
215 | { | |
216 | if (!blk_rq_is_passthrough(scmd->request)) { | |
217 | struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd); | |
218 | if (sdrv->eh_reset) | |
219 | sdrv->eh_reset(scmd); | |
220 | } | |
221 | } | |
222 | ||
1da177e4 LT |
223 | /** |
224 | * scsi_eh_scmd_add - add scsi cmd to error handling. | |
225 | * @scmd: scmd to run eh on. | |
dc8875e1 | 226 | */ |
a0658632 | 227 | void scsi_eh_scmd_add(struct scsi_cmnd *scmd) |
1da177e4 LT |
228 | { |
229 | struct Scsi_Host *shost = scmd->device->host; | |
230 | unsigned long flags; | |
2171b6d0 | 231 | int ret; |
1da177e4 | 232 | |
2171b6d0 | 233 | WARN_ON_ONCE(!shost->ehandler); |
1da177e4 LT |
234 | |
235 | spin_lock_irqsave(shost->host_lock, flags); | |
2171b6d0 HR |
236 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) { |
237 | ret = scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY); | |
238 | WARN_ON_ONCE(ret); | |
239 | } | |
bb3b621a | 240 | if (shost->eh_deadline != -1 && !shost->last_reset) |
b4562022 HR |
241 | shost->last_reset = jiffies; |
242 | ||
7a38dc0b | 243 | scsi_eh_reset(scmd); |
1da177e4 | 244 | list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q); |
1da177e4 LT |
245 | shost->host_failed++; |
246 | scsi_eh_wakeup(shost); | |
247 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
248 | } |
249 | ||
1da177e4 LT |
250 | /** |
251 | * scsi_times_out - Timeout function for normal scsi commands. | |
242f9dcb | 252 | * @req: request that is timing out. |
1da177e4 LT |
253 | * |
254 | * Notes: | |
255 | * We do not need to lock this. There is the potential for a race | |
256 | * only in that the normal completion handling might run, but if the | |
257 | * normal completion function determines that the timer has already | |
258 | * fired, then it mustn't do anything. | |
dc8875e1 | 259 | */ |
242f9dcb | 260 | enum blk_eh_timer_return scsi_times_out(struct request *req) |
1da177e4 | 261 | { |
242f9dcb | 262 | struct scsi_cmnd *scmd = req->special; |
242f9dcb | 263 | enum blk_eh_timer_return rtn = BLK_EH_NOT_HANDLED; |
0bf8c869 | 264 | struct Scsi_Host *host = scmd->device->host; |
6c5f8ce1 | 265 | |
bf816235 | 266 | trace_scsi_dispatch_cmd_timeout(scmd); |
1da177e4 LT |
267 | scsi_log_completion(scmd, TIMEOUT_ERROR); |
268 | ||
bb3b621a | 269 | if (host->eh_deadline != -1 && !host->last_reset) |
b4562022 HR |
270 | host->last_reset = jiffies; |
271 | ||
b6a05c82 | 272 | if (host->hostt->eh_timed_out) |
0bf8c869 | 273 | rtn = host->hostt->eh_timed_out(scmd); |
1da177e4 | 274 | |
a33c070b | 275 | if (rtn == BLK_EH_NOT_HANDLED) { |
a0658632 | 276 | if (scsi_abort_command(scmd) != SUCCESS) { |
2171b6d0 | 277 | set_host_byte(scmd, DID_TIME_OUT); |
a0658632 | 278 | scsi_eh_scmd_add(scmd); |
2171b6d0 | 279 | } |
a33c070b | 280 | } |
242f9dcb | 281 | |
fa990781 | 282 | return rtn; |
1da177e4 LT |
283 | } |
284 | ||
285 | /** | |
286 | * scsi_block_when_processing_errors - Prevent cmds from being queued. | |
287 | * @sdev: Device on which we are performing recovery. | |
288 | * | |
289 | * Description: | |
290 | * We block until the host is out of error recovery, and then check to | |
291 | * see whether the host or the device is offline. | |
292 | * | |
293 | * Return value: | |
294 | * 0 when dev was taken offline by error recovery. 1 OK to proceed. | |
dc8875e1 | 295 | */ |
1da177e4 LT |
296 | int scsi_block_when_processing_errors(struct scsi_device *sdev) |
297 | { | |
298 | int online; | |
299 | ||
939647ee | 300 | wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host)); |
1da177e4 LT |
301 | |
302 | online = scsi_device_online(sdev); | |
303 | ||
91921e01 HR |
304 | SCSI_LOG_ERROR_RECOVERY(5, sdev_printk(KERN_INFO, sdev, |
305 | "%s: rtn: %d\n", __func__, online)); | |
1da177e4 LT |
306 | |
307 | return online; | |
308 | } | |
309 | EXPORT_SYMBOL(scsi_block_when_processing_errors); | |
310 | ||
311 | #ifdef CONFIG_SCSI_LOGGING | |
312 | /** | |
313 | * scsi_eh_prt_fail_stats - Log info on failures. | |
314 | * @shost: scsi host being recovered. | |
315 | * @work_q: Queue of scsi cmds to process. | |
dc8875e1 | 316 | */ |
1da177e4 LT |
317 | static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost, |
318 | struct list_head *work_q) | |
319 | { | |
320 | struct scsi_cmnd *scmd; | |
321 | struct scsi_device *sdev; | |
322 | int total_failures = 0; | |
323 | int cmd_failed = 0; | |
324 | int cmd_cancel = 0; | |
325 | int devices_failed = 0; | |
326 | ||
327 | shost_for_each_device(sdev, shost) { | |
328 | list_for_each_entry(scmd, work_q, eh_entry) { | |
329 | if (scmd->device == sdev) { | |
330 | ++total_failures; | |
a0658632 | 331 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) |
1da177e4 | 332 | ++cmd_cancel; |
0bf8c869 | 333 | else |
1da177e4 LT |
334 | ++cmd_failed; |
335 | } | |
336 | } | |
337 | ||
338 | if (cmd_cancel || cmd_failed) { | |
339 | SCSI_LOG_ERROR_RECOVERY(3, | |
a3a790dc | 340 | shost_printk(KERN_INFO, shost, |
9ccfc756 | 341 | "%s: cmds failed: %d, cancel: %d\n", |
cadbd4a5 | 342 | __func__, cmd_failed, |
9ccfc756 | 343 | cmd_cancel)); |
1da177e4 LT |
344 | cmd_cancel = 0; |
345 | cmd_failed = 0; | |
346 | ++devices_failed; | |
347 | } | |
348 | } | |
349 | ||
91921e01 HR |
350 | SCSI_LOG_ERROR_RECOVERY(2, shost_printk(KERN_INFO, shost, |
351 | "Total of %d commands on %d" | |
352 | " devices require eh work\n", | |
0bf8c869 | 353 | total_failures, devices_failed)); |
1da177e4 LT |
354 | } |
355 | #endif | |
356 | ||
279afdfe EM |
357 | /** |
358 | * scsi_report_lun_change - Set flag on all *other* devices on the same target | |
359 | * to indicate that a UNIT ATTENTION is expected. | |
360 | * @sdev: Device reporting the UNIT ATTENTION | |
361 | */ | |
362 | static void scsi_report_lun_change(struct scsi_device *sdev) | |
363 | { | |
364 | sdev->sdev_target->expecting_lun_change = 1; | |
365 | } | |
366 | ||
367 | /** | |
368 | * scsi_report_sense - Examine scsi sense information and log messages for | |
369 | * certain conditions, also issue uevents for some of them. | |
370 | * @sdev: Device reporting the sense code | |
371 | * @sshdr: sshdr to be examined | |
372 | */ | |
373 | static void scsi_report_sense(struct scsi_device *sdev, | |
374 | struct scsi_sense_hdr *sshdr) | |
375 | { | |
376 | enum scsi_device_event evt_type = SDEV_EVT_MAXBITS; /* i.e. none */ | |
377 | ||
378 | if (sshdr->sense_key == UNIT_ATTENTION) { | |
379 | if (sshdr->asc == 0x3f && sshdr->ascq == 0x03) { | |
380 | evt_type = SDEV_EVT_INQUIRY_CHANGE_REPORTED; | |
381 | sdev_printk(KERN_WARNING, sdev, | |
382 | "Inquiry data has changed"); | |
383 | } else if (sshdr->asc == 0x3f && sshdr->ascq == 0x0e) { | |
384 | evt_type = SDEV_EVT_LUN_CHANGE_REPORTED; | |
385 | scsi_report_lun_change(sdev); | |
386 | sdev_printk(KERN_WARNING, sdev, | |
387 | "Warning! Received an indication that the " | |
388 | "LUN assignments on this target have " | |
389 | "changed. The Linux SCSI layer does not " | |
390 | "automatically remap LUN assignments.\n"); | |
391 | } else if (sshdr->asc == 0x3f) | |
392 | sdev_printk(KERN_WARNING, sdev, | |
393 | "Warning! Received an indication that the " | |
394 | "operating parameters on this target have " | |
395 | "changed. The Linux SCSI layer does not " | |
396 | "automatically adjust these parameters.\n"); | |
397 | ||
398 | if (sshdr->asc == 0x38 && sshdr->ascq == 0x07) { | |
399 | evt_type = SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED; | |
400 | sdev_printk(KERN_WARNING, sdev, | |
401 | "Warning! Received an indication that the " | |
402 | "LUN reached a thin provisioning soft " | |
403 | "threshold.\n"); | |
404 | } | |
405 | ||
406 | if (sshdr->asc == 0x2a && sshdr->ascq == 0x01) { | |
407 | evt_type = SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED; | |
408 | sdev_printk(KERN_WARNING, sdev, | |
409 | "Mode parameters changed"); | |
14c3e677 HR |
410 | } else if (sshdr->asc == 0x2a && sshdr->ascq == 0x06) { |
411 | evt_type = SDEV_EVT_ALUA_STATE_CHANGE_REPORTED; | |
412 | sdev_printk(KERN_WARNING, sdev, | |
413 | "Asymmetric access state changed"); | |
279afdfe EM |
414 | } else if (sshdr->asc == 0x2a && sshdr->ascq == 0x09) { |
415 | evt_type = SDEV_EVT_CAPACITY_CHANGE_REPORTED; | |
416 | sdev_printk(KERN_WARNING, sdev, | |
417 | "Capacity data has changed"); | |
418 | } else if (sshdr->asc == 0x2a) | |
419 | sdev_printk(KERN_WARNING, sdev, | |
420 | "Parameters changed"); | |
421 | } | |
422 | ||
423 | if (evt_type != SDEV_EVT_MAXBITS) { | |
424 | set_bit(evt_type, sdev->pending_events); | |
425 | schedule_work(&sdev->event_work); | |
426 | } | |
427 | } | |
428 | ||
1da177e4 LT |
429 | /** |
430 | * scsi_check_sense - Examine scsi cmd sense | |
431 | * @scmd: Cmd to have sense checked. | |
432 | * | |
433 | * Return value: | |
87f14e65 | 434 | * SUCCESS or FAILED or NEEDS_RETRY or ADD_TO_MLQUEUE |
1da177e4 LT |
435 | * |
436 | * Notes: | |
437 | * When a deferred error is detected the current command has | |
438 | * not been executed and needs retrying. | |
dc8875e1 | 439 | */ |
3852e373 | 440 | int scsi_check_sense(struct scsi_cmnd *scmd) |
1da177e4 | 441 | { |
a6a8d9f8 | 442 | struct scsi_device *sdev = scmd->device; |
1da177e4 LT |
443 | struct scsi_sense_hdr sshdr; |
444 | ||
445 | if (! scsi_command_normalize_sense(scmd, &sshdr)) | |
446 | return FAILED; /* no valid sense data */ | |
447 | ||
279afdfe EM |
448 | scsi_report_sense(sdev, &sshdr); |
449 | ||
1da177e4 LT |
450 | if (scsi_sense_is_deferred(&sshdr)) |
451 | return NEEDS_RETRY; | |
452 | ||
ee14c674 | 453 | if (sdev->handler && sdev->handler->check_sense) { |
a6a8d9f8 CS |
454 | int rc; |
455 | ||
ee14c674 | 456 | rc = sdev->handler->check_sense(sdev, &sshdr); |
a6a8d9f8 CS |
457 | if (rc != SCSI_RETURN_NOT_HANDLED) |
458 | return rc; | |
459 | /* handler does not care. Drop down to default handling */ | |
460 | } | |
461 | ||
e925cc43 CH |
462 | if (scmd->cmnd[0] == TEST_UNIT_READY && scmd->scsi_done != scsi_eh_done) |
463 | /* | |
464 | * nasty: for mid-layer issued TURs, we need to return the | |
465 | * actual sense data without any recovery attempt. For eh | |
466 | * issued ones, we need to try to recover and interpret | |
467 | */ | |
468 | return SUCCESS; | |
469 | ||
1da177e4 LT |
470 | /* |
471 | * Previous logic looked for FILEMARK, EOM or ILI which are | |
472 | * mainly associated with tapes and returned SUCCESS. | |
473 | */ | |
474 | if (sshdr.response_code == 0x70) { | |
475 | /* fixed format */ | |
476 | if (scmd->sense_buffer[2] & 0xe0) | |
477 | return SUCCESS; | |
478 | } else { | |
479 | /* | |
480 | * descriptor format: look for "stream commands sense data | |
481 | * descriptor" (see SSC-3). Assume single sense data | |
482 | * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG. | |
483 | */ | |
484 | if ((sshdr.additional_length > 3) && | |
485 | (scmd->sense_buffer[8] == 0x4) && | |
486 | (scmd->sense_buffer[11] & 0xe0)) | |
487 | return SUCCESS; | |
488 | } | |
489 | ||
490 | switch (sshdr.sense_key) { | |
491 | case NO_SENSE: | |
492 | return SUCCESS; | |
493 | case RECOVERED_ERROR: | |
494 | return /* soft_error */ SUCCESS; | |
495 | ||
496 | case ABORTED_COMMAND: | |
511e44f4 MP |
497 | if (sshdr.asc == 0x10) /* DIF */ |
498 | return SUCCESS; | |
499 | ||
1da177e4 LT |
500 | return NEEDS_RETRY; |
501 | case NOT_READY: | |
502 | case UNIT_ATTENTION: | |
503 | /* | |
504 | * if we are expecting a cc/ua because of a bus reset that we | |
505 | * performed, treat this just as a retry. otherwise this is | |
506 | * information that we should pass up to the upper-level driver | |
507 | * so that we can deal with it there. | |
508 | */ | |
509 | if (scmd->device->expecting_cc_ua) { | |
dfcf7775 TH |
510 | /* |
511 | * Because some device does not queue unit | |
512 | * attentions correctly, we carefully check | |
513 | * additional sense code and qualifier so as | |
514 | * not to squash media change unit attention. | |
515 | */ | |
516 | if (sshdr.asc != 0x28 || sshdr.ascq != 0x00) { | |
517 | scmd->device->expecting_cc_ua = 0; | |
518 | return NEEDS_RETRY; | |
519 | } | |
1da177e4 | 520 | } |
279afdfe EM |
521 | /* |
522 | * we might also expect a cc/ua if another LUN on the target | |
523 | * reported a UA with an ASC/ASCQ of 3F 0E - | |
524 | * REPORTED LUNS DATA HAS CHANGED. | |
525 | */ | |
526 | if (scmd->device->sdev_target->expecting_lun_change && | |
527 | sshdr.asc == 0x3f && sshdr.ascq == 0x0e) | |
528 | return NEEDS_RETRY; | |
1da177e4 | 529 | /* |
0bf8c869 | 530 | * if the device is in the process of becoming ready, we |
1da177e4 LT |
531 | * should retry. |
532 | */ | |
533 | if ((sshdr.asc == 0x04) && (sshdr.ascq == 0x01)) | |
534 | return NEEDS_RETRY; | |
535 | /* | |
536 | * if the device is not started, we need to wake | |
537 | * the error handler to start the motor | |
538 | */ | |
539 | if (scmd->device->allow_restart && | |
540 | (sshdr.asc == 0x04) && (sshdr.ascq == 0x02)) | |
541 | return FAILED; | |
02e031cb CH |
542 | /* |
543 | * Pass the UA upwards for a determination in the completion | |
544 | * functions. | |
545 | */ | |
546 | return SUCCESS; | |
1da177e4 | 547 | |
63583cca | 548 | /* these are not supported */ |
a9d6ceb8 HR |
549 | case DATA_PROTECT: |
550 | if (sshdr.asc == 0x27 && sshdr.ascq == 0x07) { | |
551 | /* Thin provisioning hard threshold reached */ | |
552 | set_host_byte(scmd, DID_ALLOC_FAILURE); | |
553 | return SUCCESS; | |
554 | } | |
1da177e4 LT |
555 | case COPY_ABORTED: |
556 | case VOLUME_OVERFLOW: | |
557 | case MISCOMPARE: | |
63583cca | 558 | case BLANK_CHECK: |
87f14e65 HR |
559 | set_host_byte(scmd, DID_TARGET_FAILURE); |
560 | return SUCCESS; | |
1da177e4 LT |
561 | |
562 | case MEDIUM_ERROR: | |
fd1b494d LT |
563 | if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */ |
564 | sshdr.asc == 0x13 || /* AMNF DATA FIELD */ | |
565 | sshdr.asc == 0x14) { /* RECORD NOT FOUND */ | |
7e782af5 | 566 | set_host_byte(scmd, DID_MEDIUM_ERROR); |
87f14e65 | 567 | return SUCCESS; |
fd1b494d | 568 | } |
1da177e4 LT |
569 | return NEEDS_RETRY; |
570 | ||
571 | case HARDWARE_ERROR: | |
572 | if (scmd->device->retry_hwerror) | |
bb0003c1 | 573 | return ADD_TO_MLQUEUE; |
1da177e4 | 574 | else |
87f14e65 | 575 | set_host_byte(scmd, DID_TARGET_FAILURE); |
1da177e4 LT |
576 | |
577 | case ILLEGAL_REQUEST: | |
47ac56db MS |
578 | if (sshdr.asc == 0x20 || /* Invalid command operation code */ |
579 | sshdr.asc == 0x21 || /* Logical block address out of range */ | |
580 | sshdr.asc == 0x24 || /* Invalid field in cdb */ | |
581 | sshdr.asc == 0x26) { /* Parameter value invalid */ | |
87f14e65 | 582 | set_host_byte(scmd, DID_TARGET_FAILURE); |
47ac56db MS |
583 | } |
584 | return SUCCESS; | |
585 | ||
1da177e4 LT |
586 | default: |
587 | return SUCCESS; | |
588 | } | |
589 | } | |
3852e373 | 590 | EXPORT_SYMBOL_GPL(scsi_check_sense); |
1da177e4 | 591 | |
4a84067d VD |
592 | static void scsi_handle_queue_ramp_up(struct scsi_device *sdev) |
593 | { | |
594 | struct scsi_host_template *sht = sdev->host->hostt; | |
595 | struct scsi_device *tmp_sdev; | |
596 | ||
c40ecc12 | 597 | if (!sht->track_queue_depth || |
4a84067d VD |
598 | sdev->queue_depth >= sdev->max_queue_depth) |
599 | return; | |
600 | ||
601 | if (time_before(jiffies, | |
602 | sdev->last_queue_ramp_up + sdev->queue_ramp_up_period)) | |
603 | return; | |
604 | ||
605 | if (time_before(jiffies, | |
606 | sdev->last_queue_full_time + sdev->queue_ramp_up_period)) | |
607 | return; | |
608 | ||
609 | /* | |
610 | * Walk all devices of a target and do | |
611 | * ramp up on them. | |
612 | */ | |
613 | shost_for_each_device(tmp_sdev, sdev->host) { | |
614 | if (tmp_sdev->channel != sdev->channel || | |
615 | tmp_sdev->id != sdev->id || | |
616 | tmp_sdev->queue_depth == sdev->max_queue_depth) | |
617 | continue; | |
c40ecc12 | 618 | |
db5ed4df | 619 | scsi_change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1); |
4a84067d VD |
620 | sdev->last_queue_ramp_up = jiffies; |
621 | } | |
622 | } | |
623 | ||
42a6a918 MC |
624 | static void scsi_handle_queue_full(struct scsi_device *sdev) |
625 | { | |
626 | struct scsi_host_template *sht = sdev->host->hostt; | |
627 | struct scsi_device *tmp_sdev; | |
628 | ||
c40ecc12 | 629 | if (!sht->track_queue_depth) |
42a6a918 MC |
630 | return; |
631 | ||
632 | shost_for_each_device(tmp_sdev, sdev->host) { | |
633 | if (tmp_sdev->channel != sdev->channel || | |
634 | tmp_sdev->id != sdev->id) | |
635 | continue; | |
636 | /* | |
637 | * We do not know the number of commands that were at | |
638 | * the device when we got the queue full so we start | |
639 | * from the highest possible value and work our way down. | |
640 | */ | |
c40ecc12 | 641 | scsi_track_queue_full(tmp_sdev, tmp_sdev->queue_depth - 1); |
42a6a918 MC |
642 | } |
643 | } | |
644 | ||
1da177e4 LT |
645 | /** |
646 | * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD. | |
647 | * @scmd: SCSI cmd to examine. | |
648 | * | |
649 | * Notes: | |
650 | * This is *only* called when we are examining the status of commands | |
651 | * queued during error recovery. the main difference here is that we | |
652 | * don't allow for the possibility of retries here, and we are a lot | |
653 | * more restrictive about what we consider acceptable. | |
dc8875e1 | 654 | */ |
1da177e4 LT |
655 | static int scsi_eh_completed_normally(struct scsi_cmnd *scmd) |
656 | { | |
657 | /* | |
658 | * first check the host byte, to see if there is anything in there | |
659 | * that would indicate what we need to do. | |
660 | */ | |
661 | if (host_byte(scmd->result) == DID_RESET) { | |
662 | /* | |
663 | * rats. we are already in the error handler, so we now | |
664 | * get to try and figure out what to do next. if the sense | |
665 | * is valid, we have a pretty good idea of what to do. | |
666 | * if not, we mark it as FAILED. | |
667 | */ | |
668 | return scsi_check_sense(scmd); | |
669 | } | |
670 | if (host_byte(scmd->result) != DID_OK) | |
671 | return FAILED; | |
672 | ||
673 | /* | |
674 | * next, check the message byte. | |
675 | */ | |
676 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
677 | return FAILED; | |
678 | ||
679 | /* | |
680 | * now, check the status byte to see if this indicates | |
681 | * anything special. | |
682 | */ | |
683 | switch (status_byte(scmd->result)) { | |
684 | case GOOD: | |
4a84067d | 685 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 LT |
686 | case COMMAND_TERMINATED: |
687 | return SUCCESS; | |
688 | case CHECK_CONDITION: | |
689 | return scsi_check_sense(scmd); | |
690 | case CONDITION_GOOD: | |
691 | case INTERMEDIATE_GOOD: | |
692 | case INTERMEDIATE_C_GOOD: | |
693 | /* | |
694 | * who knows? FIXME(eric) | |
695 | */ | |
696 | return SUCCESS; | |
5f91bb05 | 697 | case RESERVATION_CONFLICT: |
67110dfd JB |
698 | if (scmd->cmnd[0] == TEST_UNIT_READY) |
699 | /* it is a success, we probed the device and | |
700 | * found it */ | |
701 | return SUCCESS; | |
702 | /* otherwise, we failed to send the command */ | |
703 | return FAILED; | |
1da177e4 | 704 | case QUEUE_FULL: |
42a6a918 MC |
705 | scsi_handle_queue_full(scmd->device); |
706 | /* fall through */ | |
707 | case BUSY: | |
3eb3a928 | 708 | return NEEDS_RETRY; |
1da177e4 LT |
709 | default: |
710 | return FAILED; | |
711 | } | |
712 | return FAILED; | |
713 | } | |
714 | ||
1da177e4 LT |
715 | /** |
716 | * scsi_eh_done - Completion function for error handling. | |
717 | * @scmd: Cmd that is done. | |
dc8875e1 | 718 | */ |
1da177e4 LT |
719 | static void scsi_eh_done(struct scsi_cmnd *scmd) |
720 | { | |
0bf8c869 | 721 | struct completion *eh_action; |
85631672 | 722 | |
91921e01 | 723 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
470613b4 | 724 | "%s result: %x\n", __func__, scmd->result)); |
85631672 MR |
725 | |
726 | eh_action = scmd->device->host->eh_action; | |
727 | if (eh_action) | |
728 | complete(eh_action); | |
1da177e4 LT |
729 | } |
730 | ||
292148f8 BK |
731 | /** |
732 | * scsi_try_host_reset - ask host adapter to reset itself | |
c2b3ebd0 | 733 | * @scmd: SCSI cmd to send host reset. |
dc8875e1 | 734 | */ |
292148f8 BK |
735 | static int scsi_try_host_reset(struct scsi_cmnd *scmd) |
736 | { | |
737 | unsigned long flags; | |
738 | int rtn; | |
0bf8c869 JJ |
739 | struct Scsi_Host *host = scmd->device->host; |
740 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 | 741 | |
91921e01 HR |
742 | SCSI_LOG_ERROR_RECOVERY(3, |
743 | shost_printk(KERN_INFO, host, "Snd Host RST\n")); | |
292148f8 | 744 | |
0bf8c869 | 745 | if (!hostt->eh_host_reset_handler) |
292148f8 BK |
746 | return FAILED; |
747 | ||
0bf8c869 | 748 | rtn = hostt->eh_host_reset_handler(scmd); |
292148f8 BK |
749 | |
750 | if (rtn == SUCCESS) { | |
0bf8c869 | 751 | if (!hostt->skip_settle_delay) |
292148f8 | 752 | ssleep(HOST_RESET_SETTLE_TIME); |
0bf8c869 JJ |
753 | spin_lock_irqsave(host->host_lock, flags); |
754 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
755 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
756 | } |
757 | ||
758 | return rtn; | |
759 | } | |
760 | ||
761 | /** | |
762 | * scsi_try_bus_reset - ask host to perform a bus reset | |
763 | * @scmd: SCSI cmd to send bus reset. | |
dc8875e1 | 764 | */ |
292148f8 BK |
765 | static int scsi_try_bus_reset(struct scsi_cmnd *scmd) |
766 | { | |
767 | unsigned long flags; | |
768 | int rtn; | |
0bf8c869 JJ |
769 | struct Scsi_Host *host = scmd->device->host; |
770 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 | 771 | |
91921e01 HR |
772 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
773 | "%s: Snd Bus RST\n", __func__)); | |
292148f8 | 774 | |
0bf8c869 | 775 | if (!hostt->eh_bus_reset_handler) |
292148f8 BK |
776 | return FAILED; |
777 | ||
0bf8c869 | 778 | rtn = hostt->eh_bus_reset_handler(scmd); |
292148f8 BK |
779 | |
780 | if (rtn == SUCCESS) { | |
0bf8c869 | 781 | if (!hostt->skip_settle_delay) |
292148f8 | 782 | ssleep(BUS_RESET_SETTLE_TIME); |
0bf8c869 JJ |
783 | spin_lock_irqsave(host->host_lock, flags); |
784 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
785 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
786 | } |
787 | ||
788 | return rtn; | |
789 | } | |
790 | ||
30bd7df8 MC |
791 | static void __scsi_report_device_reset(struct scsi_device *sdev, void *data) |
792 | { | |
793 | sdev->was_reset = 1; | |
794 | sdev->expecting_cc_ua = 1; | |
795 | } | |
796 | ||
797 | /** | |
798 | * scsi_try_target_reset - Ask host to perform a target reset | |
799 | * @scmd: SCSI cmd used to send a target reset | |
800 | * | |
801 | * Notes: | |
802 | * There is no timeout for this operation. if this operation is | |
803 | * unreliable for a given host, then the host itself needs to put a | |
804 | * timer on it, and set the host back to a consistent state prior to | |
805 | * returning. | |
806 | */ | |
807 | static int scsi_try_target_reset(struct scsi_cmnd *scmd) | |
808 | { | |
809 | unsigned long flags; | |
810 | int rtn; | |
0bf8c869 JJ |
811 | struct Scsi_Host *host = scmd->device->host; |
812 | struct scsi_host_template *hostt = host->hostt; | |
30bd7df8 | 813 | |
0bf8c869 | 814 | if (!hostt->eh_target_reset_handler) |
30bd7df8 MC |
815 | return FAILED; |
816 | ||
0bf8c869 | 817 | rtn = hostt->eh_target_reset_handler(scmd); |
30bd7df8 | 818 | if (rtn == SUCCESS) { |
0bf8c869 | 819 | spin_lock_irqsave(host->host_lock, flags); |
30bd7df8 MC |
820 | __starget_for_each_device(scsi_target(scmd->device), NULL, |
821 | __scsi_report_device_reset); | |
0bf8c869 | 822 | spin_unlock_irqrestore(host->host_lock, flags); |
30bd7df8 MC |
823 | } |
824 | ||
825 | return rtn; | |
826 | } | |
827 | ||
292148f8 BK |
828 | /** |
829 | * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev | |
830 | * @scmd: SCSI cmd used to send BDR | |
831 | * | |
832 | * Notes: | |
833 | * There is no timeout for this operation. if this operation is | |
834 | * unreliable for a given host, then the host itself needs to put a | |
835 | * timer on it, and set the host back to a consistent state prior to | |
836 | * returning. | |
dc8875e1 | 837 | */ |
292148f8 BK |
838 | static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd) |
839 | { | |
840 | int rtn; | |
0bf8c869 | 841 | struct scsi_host_template *hostt = scmd->device->host->hostt; |
292148f8 | 842 | |
0bf8c869 | 843 | if (!hostt->eh_device_reset_handler) |
292148f8 BK |
844 | return FAILED; |
845 | ||
0bf8c869 | 846 | rtn = hostt->eh_device_reset_handler(scmd); |
30bd7df8 MC |
847 | if (rtn == SUCCESS) |
848 | __scsi_report_device_reset(scmd->device, NULL); | |
292148f8 BK |
849 | return rtn; |
850 | } | |
851 | ||
883a030f HR |
852 | /** |
853 | * scsi_try_to_abort_cmd - Ask host to abort a SCSI command | |
6583f6fb | 854 | * @hostt: SCSI driver host template |
883a030f HR |
855 | * @scmd: SCSI cmd used to send a target reset |
856 | * | |
857 | * Return value: | |
858 | * SUCCESS, FAILED, or FAST_IO_FAIL | |
859 | * | |
860 | * Notes: | |
861 | * SUCCESS does not necessarily indicate that the command | |
862 | * has been aborted; it only indicates that the LLDDs | |
863 | * has cleared all references to that command. | |
864 | * LLDDs should return FAILED only if an abort was required | |
865 | * but could not be executed. LLDDs should return FAST_IO_FAIL | |
866 | * if the device is temporarily unavailable (eg due to a | |
867 | * link down on FibreChannel) | |
868 | */ | |
869 | static int scsi_try_to_abort_cmd(struct scsi_host_template *hostt, | |
870 | 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; |
8e8c9d01 | 921 | ses->eh_eflags = scmd->eh_eflags; |
631c228c | 922 | |
db007fc5 | 923 | scmd->prot_op = SCSI_PROT_NORMAL; |
c69e6f81 | 924 | scmd->eh_eflags = 0; |
64a87b24 BH |
925 | scmd->cmnd = ses->eh_cmnd; |
926 | memset(scmd->cmnd, 0, BLK_MAX_CDB); | |
30b0c37b | 927 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
6f9a35e2 | 928 | scmd->request->next_rq = NULL; |
644373a4 | 929 | scmd->result = 0; |
30b0c37b | 930 | |
55db6c1b | 931 | if (sense_bytes) { |
30b0c37b BH |
932 | scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE, |
933 | sense_bytes); | |
e1c23468 | 934 | sg_init_one(&ses->sense_sgl, scmd->sense_buffer, |
30b0c37b BH |
935 | scmd->sdb.length); |
936 | scmd->sdb.table.sgl = &ses->sense_sgl; | |
55db6c1b | 937 | scmd->sc_data_direction = DMA_FROM_DEVICE; |
0c958ecc | 938 | scmd->sdb.table.nents = scmd->sdb.table.orig_nents = 1; |
55db6c1b | 939 | scmd->cmnd[0] = REQUEST_SENSE; |
30b0c37b | 940 | scmd->cmnd[4] = scmd->sdb.length; |
55db6c1b | 941 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); |
631c228c | 942 | } else { |
631c228c | 943 | scmd->sc_data_direction = DMA_NONE; |
55db6c1b | 944 | if (cmnd) { |
64a87b24 | 945 | BUG_ON(cmnd_size > BLK_MAX_CDB); |
55db6c1b BH |
946 | memcpy(scmd->cmnd, cmnd, cmnd_size); |
947 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); | |
948 | } | |
631c228c CH |
949 | } |
950 | ||
951 | scmd->underflow = 0; | |
631c228c | 952 | |
55db6c1b | 953 | if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN) |
1da177e4 | 954 | scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) | |
f59114b7 | 955 | (sdev->lun << 5 & 0xe0); |
1da177e4 | 956 | |
631c228c CH |
957 | /* |
958 | * Zero the sense buffer. The scsi spec mandates that any | |
959 | * untransferred sense data should be interpreted as being zero. | |
960 | */ | |
b80ca4f7 | 961 | memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); |
e1c23468 BH |
962 | } |
963 | EXPORT_SYMBOL(scsi_eh_prep_cmnd); | |
964 | ||
965 | /** | |
3b729f76 | 966 | * scsi_eh_restore_cmnd - Restore a scsi command info as part of error recovery |
e1c23468 | 967 | * @scmd: SCSI command structure to restore |
477e608c | 968 | * @ses: saved information from a coresponding call to scsi_eh_prep_cmnd |
e1c23468 | 969 | * |
477e608c | 970 | * Undo any damage done by above scsi_eh_prep_cmnd(). |
dc8875e1 | 971 | */ |
e1c23468 BH |
972 | void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses) |
973 | { | |
974 | /* | |
975 | * Restore original data | |
976 | */ | |
977 | scmd->cmd_len = ses->cmd_len; | |
64a87b24 | 978 | scmd->cmnd = ses->cmnd; |
e1c23468 | 979 | scmd->sc_data_direction = ses->data_direction; |
30b0c37b | 980 | scmd->sdb = ses->sdb; |
6f9a35e2 | 981 | scmd->request->next_rq = ses->next_rq; |
e1c23468 | 982 | scmd->result = ses->result; |
12265709 | 983 | scmd->underflow = ses->underflow; |
db007fc5 | 984 | scmd->prot_op = ses->prot_op; |
8e8c9d01 | 985 | scmd->eh_eflags = ses->eh_eflags; |
e1c23468 BH |
986 | } |
987 | EXPORT_SYMBOL(scsi_eh_restore_cmnd); | |
631c228c | 988 | |
e1c23468 | 989 | /** |
3b729f76 | 990 | * scsi_send_eh_cmnd - submit a scsi command as part of error recovery |
e1c23468 BH |
991 | * @scmd: SCSI command structure to hijack |
992 | * @cmnd: CDB to send | |
993 | * @cmnd_size: size in bytes of @cmnd | |
994 | * @timeout: timeout for this request | |
995 | * @sense_bytes: size of sense data to copy or 0 | |
996 | * | |
997 | * This function is used to send a scsi command down to a target device | |
998 | * as part of the error recovery process. See also scsi_eh_prep_cmnd() above. | |
999 | * | |
1000 | * Return value: | |
1001 | * SUCCESS or FAILED or NEEDS_RETRY | |
dc8875e1 | 1002 | */ |
e1c23468 BH |
1003 | static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd, |
1004 | int cmnd_size, int timeout, unsigned sense_bytes) | |
1005 | { | |
1006 | struct scsi_device *sdev = scmd->device; | |
1007 | struct Scsi_Host *shost = sdev->host; | |
1008 | DECLARE_COMPLETION_ONSTACK(done); | |
fc73648a | 1009 | unsigned long timeleft = timeout; |
e1c23468 | 1010 | struct scsi_eh_save ses; |
fc73648a | 1011 | const unsigned long stall_for = msecs_to_jiffies(100); |
e1c23468 BH |
1012 | int rtn; |
1013 | ||
fc73648a | 1014 | retry: |
e1c23468 | 1015 | scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes); |
7dfdc9a5 | 1016 | shost->eh_action = &done; |
1da177e4 | 1017 | |
1da177e4 | 1018 | scsi_log_send(scmd); |
f281233d | 1019 | scmd->scsi_done = scsi_eh_done; |
fc73648a HR |
1020 | rtn = shost->hostt->queuecommand(shost, scmd); |
1021 | if (rtn) { | |
1022 | if (timeleft > stall_for) { | |
1023 | scsi_eh_restore_cmnd(scmd, &ses); | |
1024 | timeleft -= stall_for; | |
1025 | msleep(jiffies_to_msecs(stall_for)); | |
1026 | goto retry; | |
1027 | } | |
1028 | /* signal not to enter either branch of the if () below */ | |
1029 | timeleft = 0; | |
511833ac | 1030 | rtn = FAILED; |
fc73648a HR |
1031 | } else { |
1032 | timeleft = wait_for_completion_timeout(&done, timeout); | |
ac61d195 | 1033 | rtn = SUCCESS; |
fc73648a | 1034 | } |
1da177e4 | 1035 | |
f59114b7 | 1036 | shost->eh_action = NULL; |
1da177e4 | 1037 | |
fc73648a | 1038 | scsi_log_completion(scmd, rtn); |
1da177e4 | 1039 | |
91921e01 | 1040 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
470613b4 HR |
1041 | "%s timeleft: %ld\n", |
1042 | __func__, timeleft)); | |
1da177e4 LT |
1043 | |
1044 | /* | |
fc73648a HR |
1045 | * If there is time left scsi_eh_done got called, and we will examine |
1046 | * the actual status codes to see whether the command actually did | |
1047 | * complete normally, else if we have a zero return and no time left, | |
1048 | * the command must still be pending, so abort it and return FAILED. | |
1049 | * If we never actually managed to issue the command, because | |
1050 | * ->queuecommand() kept returning non zero, use the rtn = FAILED | |
1051 | * value above (so don't execute either branch of the if) | |
1da177e4 | 1052 | */ |
7dfdc9a5 | 1053 | if (timeleft) { |
1da177e4 | 1054 | rtn = scsi_eh_completed_normally(scmd); |
91921e01 HR |
1055 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
1056 | "%s: scsi_eh_completed_normally %x\n", __func__, rtn)); | |
7dfdc9a5 | 1057 | |
1da177e4 LT |
1058 | switch (rtn) { |
1059 | case SUCCESS: | |
1060 | case NEEDS_RETRY: | |
1061 | case FAILED: | |
1062 | break; | |
6e883b0e HR |
1063 | case ADD_TO_MLQUEUE: |
1064 | rtn = NEEDS_RETRY; | |
1065 | break; | |
1da177e4 LT |
1066 | default: |
1067 | rtn = FAILED; | |
1068 | break; | |
1069 | } | |
511833ac | 1070 | } else if (rtn != FAILED) { |
292148f8 | 1071 | scsi_abort_eh_cmnd(scmd); |
7dfdc9a5 | 1072 | rtn = FAILED; |
1da177e4 LT |
1073 | } |
1074 | ||
e1c23468 | 1075 | scsi_eh_restore_cmnd(scmd, &ses); |
18a4d0a2 | 1076 | |
1da177e4 LT |
1077 | return rtn; |
1078 | } | |
1079 | ||
1080 | /** | |
1081 | * scsi_request_sense - Request sense data from a particular target. | |
1082 | * @scmd: SCSI cmd for request sense. | |
1083 | * | |
1084 | * Notes: | |
1085 | * Some hosts automatically obtain this information, others require | |
1086 | * that we obtain it on our own. This function will *not* return until | |
1087 | * the command either times out, or it completes. | |
dc8875e1 | 1088 | */ |
1da177e4 LT |
1089 | static int scsi_request_sense(struct scsi_cmnd *scmd) |
1090 | { | |
0816c925 | 1091 | return scsi_send_eh_cmnd(scmd, NULL, 0, scmd->device->eh_timeout, ~0); |
1da177e4 LT |
1092 | } |
1093 | ||
2451079b JB |
1094 | static int scsi_eh_action(struct scsi_cmnd *scmd, int rtn) |
1095 | { | |
57292b58 | 1096 | if (!blk_rq_is_passthrough(scmd->request)) { |
2451079b JB |
1097 | struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd); |
1098 | if (sdrv->eh_action) | |
1099 | rtn = sdrv->eh_action(scmd, rtn); | |
1100 | } | |
1101 | return rtn; | |
1102 | } | |
1103 | ||
1da177e4 LT |
1104 | /** |
1105 | * scsi_eh_finish_cmd - Handle a cmd that eh is finished with. | |
1106 | * @scmd: Original SCSI cmd that eh has finished. | |
1107 | * @done_q: Queue for processed commands. | |
1108 | * | |
1109 | * Notes: | |
1110 | * We don't want to use the normal command completion while we are are | |
1111 | * still handling errors - it may cause other commands to be queued, | |
eb44820c | 1112 | * and that would disturb what we are doing. Thus we really want to |
1da177e4 LT |
1113 | * keep a list of pending commands for final completion, and once we |
1114 | * are ready to leave error handling we handle completion for real. | |
dc8875e1 | 1115 | */ |
041c5fc3 | 1116 | void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q) |
1da177e4 | 1117 | { |
1da177e4 LT |
1118 | list_move_tail(&scmd->eh_entry, done_q); |
1119 | } | |
041c5fc3 | 1120 | EXPORT_SYMBOL(scsi_eh_finish_cmd); |
1da177e4 LT |
1121 | |
1122 | /** | |
1123 | * scsi_eh_get_sense - Get device sense data. | |
1124 | * @work_q: Queue of commands to process. | |
eb44820c | 1125 | * @done_q: Queue of processed commands. |
1da177e4 LT |
1126 | * |
1127 | * Description: | |
1128 | * See if we need to request sense information. if so, then get it | |
0bf8c869 | 1129 | * now, so we have a better idea of what to do. |
1da177e4 LT |
1130 | * |
1131 | * Notes: | |
1132 | * This has the unfortunate side effect that if a shost adapter does | |
eb44820c | 1133 | * not automatically request sense information, we end up shutting |
1da177e4 LT |
1134 | * it down before we request it. |
1135 | * | |
1136 | * All drivers should request sense information internally these days, | |
1137 | * so for now all I have to say is tough noogies if you end up in here. | |
1138 | * | |
1139 | * XXX: Long term this code should go away, but that needs an audit of | |
1140 | * all LLDDs first. | |
dc8875e1 | 1141 | */ |
dca84e46 DW |
1142 | int scsi_eh_get_sense(struct list_head *work_q, |
1143 | struct list_head *done_q) | |
1da177e4 | 1144 | { |
937abeaa | 1145 | struct scsi_cmnd *scmd, *next; |
b4562022 | 1146 | struct Scsi_Host *shost; |
1da177e4 LT |
1147 | int rtn; |
1148 | ||
709c75b5 | 1149 | /* |
1150 | * If SCSI_EH_ABORT_SCHEDULED has been set, it is timeout IO, | |
1151 | * should not get sense. | |
1152 | */ | |
937abeaa | 1153 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
a0658632 | 1154 | if ((scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) || |
1da177e4 LT |
1155 | SCSI_SENSE_VALID(scmd)) |
1156 | continue; | |
1157 | ||
b4562022 | 1158 | shost = scmd->device->host; |
b4562022 | 1159 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 | 1160 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1161 | scmd_printk(KERN_INFO, scmd, |
1162 | "%s: skip request sense, past eh deadline\n", | |
1163 | current->comm)); | |
b4562022 HR |
1164 | break; |
1165 | } | |
d555a2ab JB |
1166 | if (status_byte(scmd->result) != CHECK_CONDITION) |
1167 | /* | |
1168 | * don't request sense if there's no check condition | |
1169 | * status because the error we're processing isn't one | |
1170 | * that has a sense code (and some devices get | |
1171 | * confused by sense requests out of the blue) | |
1172 | */ | |
1173 | continue; | |
1174 | ||
3bf743e7 JG |
1175 | SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd, |
1176 | "%s: requesting sense\n", | |
1177 | current->comm)); | |
1da177e4 LT |
1178 | rtn = scsi_request_sense(scmd); |
1179 | if (rtn != SUCCESS) | |
1180 | continue; | |
1181 | ||
91921e01 | 1182 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
470613b4 | 1183 | "sense requested, result %x\n", scmd->result)); |
d811b848 | 1184 | SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense(scmd)); |
1da177e4 LT |
1185 | |
1186 | rtn = scsi_decide_disposition(scmd); | |
1187 | ||
1188 | /* | |
1189 | * if the result was normal, then just pass it along to the | |
1190 | * upper level. | |
1191 | */ | |
1192 | if (rtn == SUCCESS) | |
1193 | /* we don't want this command reissued, just | |
1194 | * finished with the sense data, so set | |
1195 | * retries to the max allowed to ensure it | |
1196 | * won't get reissued */ | |
1197 | scmd->retries = scmd->allowed; | |
1198 | else if (rtn != NEEDS_RETRY) | |
1199 | continue; | |
1200 | ||
1201 | scsi_eh_finish_cmd(scmd, done_q); | |
1202 | } | |
1203 | ||
1204 | return list_empty(work_q); | |
1205 | } | |
dca84e46 | 1206 | EXPORT_SYMBOL_GPL(scsi_eh_get_sense); |
1da177e4 | 1207 | |
1da177e4 LT |
1208 | /** |
1209 | * scsi_eh_tur - Send TUR to device. | |
eb44820c | 1210 | * @scmd: &scsi_cmnd to send TUR |
1da177e4 LT |
1211 | * |
1212 | * Return value: | |
1213 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1214 | */ |
1da177e4 LT |
1215 | static int scsi_eh_tur(struct scsi_cmnd *scmd) |
1216 | { | |
1217 | static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0}; | |
1218 | int retry_cnt = 1, rtn; | |
1219 | ||
1220 | retry_tur: | |
0816c925 MP |
1221 | rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, |
1222 | scmd->device->eh_timeout, 0); | |
1da177e4 | 1223 | |
91921e01 | 1224 | SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, |
470613b4 | 1225 | "%s return: %x\n", __func__, rtn)); |
631c228c CH |
1226 | |
1227 | switch (rtn) { | |
1228 | case NEEDS_RETRY: | |
1da177e4 LT |
1229 | if (retry_cnt--) |
1230 | goto retry_tur; | |
631c228c CH |
1231 | /*FALLTHRU*/ |
1232 | case SUCCESS: | |
e47373ec | 1233 | return 0; |
631c228c CH |
1234 | default: |
1235 | return 1; | |
e47373ec | 1236 | } |
1da177e4 LT |
1237 | } |
1238 | ||
3eef6257 DJ |
1239 | /** |
1240 | * scsi_eh_test_devices - check if devices are responding from error recovery. | |
1241 | * @cmd_list: scsi commands in error recovery. | |
74cf298f RD |
1242 | * @work_q: queue for commands which still need more error recovery |
1243 | * @done_q: queue for commands which are finished | |
1244 | * @try_stu: boolean on if a STU command should be tried in addition to TUR. | |
3eef6257 DJ |
1245 | * |
1246 | * Decription: | |
1247 | * Tests if devices are in a working state. Commands to devices now in | |
1248 | * a working state are sent to the done_q while commands to devices which | |
1249 | * are still failing to respond are returned to the work_q for more | |
1250 | * processing. | |
1251 | **/ | |
1252 | static int scsi_eh_test_devices(struct list_head *cmd_list, | |
1253 | struct list_head *work_q, | |
1254 | struct list_head *done_q, int try_stu) | |
1255 | { | |
1256 | struct scsi_cmnd *scmd, *next; | |
1257 | struct scsi_device *sdev; | |
1258 | int finish_cmds; | |
1259 | ||
1260 | while (!list_empty(cmd_list)) { | |
1261 | scmd = list_entry(cmd_list->next, struct scsi_cmnd, eh_entry); | |
1262 | sdev = scmd->device; | |
1263 | ||
b4562022 | 1264 | if (!try_stu) { |
b4562022 HR |
1265 | if (scsi_host_eh_past_deadline(sdev->host)) { |
1266 | /* Push items back onto work_q */ | |
1267 | list_splice_init(cmd_list, work_q); | |
b4562022 | 1268 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1269 | sdev_printk(KERN_INFO, sdev, |
1270 | "%s: skip test device, past eh deadline", | |
1271 | current->comm)); | |
b4562022 HR |
1272 | break; |
1273 | } | |
b4562022 HR |
1274 | } |
1275 | ||
3eef6257 DJ |
1276 | finish_cmds = !scsi_device_online(scmd->device) || |
1277 | (try_stu && !scsi_eh_try_stu(scmd) && | |
1278 | !scsi_eh_tur(scmd)) || | |
1279 | !scsi_eh_tur(scmd); | |
1280 | ||
1281 | list_for_each_entry_safe(scmd, next, cmd_list, eh_entry) | |
1282 | if (scmd->device == sdev) { | |
2451079b JB |
1283 | if (finish_cmds && |
1284 | (try_stu || | |
1285 | scsi_eh_action(scmd, SUCCESS) == SUCCESS)) | |
3eef6257 DJ |
1286 | scsi_eh_finish_cmd(scmd, done_q); |
1287 | else | |
1288 | list_move_tail(&scmd->eh_entry, work_q); | |
1289 | } | |
1290 | } | |
1291 | return list_empty(work_q); | |
1292 | } | |
1293 | ||
1da177e4 LT |
1294 | /** |
1295 | * scsi_eh_try_stu - Send START_UNIT to device. | |
eb44820c | 1296 | * @scmd: &scsi_cmnd to send START_UNIT |
1da177e4 LT |
1297 | * |
1298 | * Return value: | |
1299 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1300 | */ |
1da177e4 LT |
1301 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd) |
1302 | { | |
1303 | static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0}; | |
1da177e4 | 1304 | |
631c228c | 1305 | if (scmd->device->allow_restart) { |
ed773e66 BK |
1306 | int i, rtn = NEEDS_RETRY; |
1307 | ||
1308 | for (i = 0; rtn == NEEDS_RETRY && i < 2; i++) | |
9728c081 | 1309 | rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0); |
1da177e4 | 1310 | |
631c228c CH |
1311 | if (rtn == SUCCESS) |
1312 | return 0; | |
1313 | } | |
1da177e4 | 1314 | |
1da177e4 LT |
1315 | return 1; |
1316 | } | |
1317 | ||
1318 | /** | |
1319 | * scsi_eh_stu - send START_UNIT if needed | |
eb44820c | 1320 | * @shost: &scsi host being recovered. |
74cf298f | 1321 | * @work_q: &list_head for pending commands. |
eb44820c | 1322 | * @done_q: &list_head for processed commands. |
1da177e4 LT |
1323 | * |
1324 | * Notes: | |
1325 | * If commands are failing due to not ready, initializing command required, | |
0bf8c869 | 1326 | * try revalidating the device, which will end up sending a start unit. |
dc8875e1 | 1327 | */ |
1da177e4 LT |
1328 | static int scsi_eh_stu(struct Scsi_Host *shost, |
1329 | struct list_head *work_q, | |
1330 | struct list_head *done_q) | |
1331 | { | |
937abeaa | 1332 | struct scsi_cmnd *scmd, *stu_scmd, *next; |
1da177e4 LT |
1333 | struct scsi_device *sdev; |
1334 | ||
1335 | shost_for_each_device(sdev, shost) { | |
b4562022 | 1336 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 | 1337 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1338 | sdev_printk(KERN_INFO, sdev, |
1339 | "%s: skip START_UNIT, past eh deadline\n", | |
1340 | current->comm)); | |
b4562022 HR |
1341 | break; |
1342 | } | |
1da177e4 LT |
1343 | stu_scmd = NULL; |
1344 | list_for_each_entry(scmd, work_q, eh_entry) | |
1345 | if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) && | |
1346 | scsi_check_sense(scmd) == FAILED ) { | |
1347 | stu_scmd = scmd; | |
1348 | break; | |
1349 | } | |
1350 | ||
1351 | if (!stu_scmd) | |
1352 | continue; | |
1353 | ||
91921e01 | 1354 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1355 | sdev_printk(KERN_INFO, sdev, |
1356 | "%s: Sending START_UNIT\n", | |
1357 | current->comm)); | |
1da177e4 LT |
1358 | |
1359 | if (!scsi_eh_try_stu(stu_scmd)) { | |
1360 | if (!scsi_device_online(sdev) || | |
1361 | !scsi_eh_tur(stu_scmd)) { | |
937abeaa CH |
1362 | list_for_each_entry_safe(scmd, next, |
1363 | work_q, eh_entry) { | |
2451079b JB |
1364 | if (scmd->device == sdev && |
1365 | scsi_eh_action(scmd, SUCCESS) == SUCCESS) | |
1da177e4 LT |
1366 | scsi_eh_finish_cmd(scmd, done_q); |
1367 | } | |
1368 | } | |
1369 | } else { | |
1370 | SCSI_LOG_ERROR_RECOVERY(3, | |
a222b1e2 HR |
1371 | sdev_printk(KERN_INFO, sdev, |
1372 | "%s: START_UNIT failed\n", | |
1373 | current->comm)); | |
1da177e4 LT |
1374 | } |
1375 | } | |
1376 | ||
1377 | return list_empty(work_q); | |
1378 | } | |
1379 | ||
1380 | ||
1381 | /** | |
1382 | * scsi_eh_bus_device_reset - send bdr if needed | |
1383 | * @shost: scsi host being recovered. | |
74cf298f | 1384 | * @work_q: &list_head for pending commands. |
eb44820c | 1385 | * @done_q: &list_head for processed commands. |
1da177e4 LT |
1386 | * |
1387 | * Notes: | |
eb44820c | 1388 | * Try a bus device reset. Still, look to see whether we have multiple |
1da177e4 LT |
1389 | * devices that are jammed or not - if we have multiple devices, it |
1390 | * makes no sense to try bus_device_reset - we really would need to try | |
0bf8c869 | 1391 | * a bus_reset instead. |
dc8875e1 | 1392 | */ |
1da177e4 LT |
1393 | static int scsi_eh_bus_device_reset(struct Scsi_Host *shost, |
1394 | struct list_head *work_q, | |
1395 | struct list_head *done_q) | |
1396 | { | |
937abeaa | 1397 | struct scsi_cmnd *scmd, *bdr_scmd, *next; |
1da177e4 LT |
1398 | struct scsi_device *sdev; |
1399 | int rtn; | |
1400 | ||
1401 | shost_for_each_device(sdev, shost) { | |
b4562022 | 1402 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 | 1403 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1404 | sdev_printk(KERN_INFO, sdev, |
1405 | "%s: skip BDR, past eh deadline\n", | |
1406 | current->comm)); | |
b4562022 HR |
1407 | break; |
1408 | } | |
1da177e4 LT |
1409 | bdr_scmd = NULL; |
1410 | list_for_each_entry(scmd, work_q, eh_entry) | |
1411 | if (scmd->device == sdev) { | |
1412 | bdr_scmd = scmd; | |
1413 | break; | |
1414 | } | |
1415 | ||
1416 | if (!bdr_scmd) | |
1417 | continue; | |
1418 | ||
91921e01 | 1419 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1420 | sdev_printk(KERN_INFO, sdev, |
1421 | "%s: Sending BDR\n", current->comm)); | |
1da177e4 | 1422 | rtn = scsi_try_bus_device_reset(bdr_scmd); |
2f2eb587 | 1423 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
1da177e4 | 1424 | if (!scsi_device_online(sdev) || |
2f2eb587 | 1425 | rtn == FAST_IO_FAIL || |
1da177e4 | 1426 | !scsi_eh_tur(bdr_scmd)) { |
937abeaa CH |
1427 | list_for_each_entry_safe(scmd, next, |
1428 | work_q, eh_entry) { | |
2451079b JB |
1429 | if (scmd->device == sdev && |
1430 | scsi_eh_action(scmd, rtn) != FAILED) | |
1da177e4 LT |
1431 | scsi_eh_finish_cmd(scmd, |
1432 | done_q); | |
1433 | } | |
1434 | } | |
1435 | } else { | |
91921e01 | 1436 | SCSI_LOG_ERROR_RECOVERY(3, |
a222b1e2 HR |
1437 | sdev_printk(KERN_INFO, sdev, |
1438 | "%s: BDR failed\n", current->comm)); | |
1da177e4 LT |
1439 | } |
1440 | } | |
1441 | ||
1442 | return list_empty(work_q); | |
1443 | } | |
1444 | ||
30bd7df8 MC |
1445 | /** |
1446 | * scsi_eh_target_reset - send target reset if needed | |
1447 | * @shost: scsi host being recovered. | |
74cf298f | 1448 | * @work_q: &list_head for pending commands. |
30bd7df8 MC |
1449 | * @done_q: &list_head for processed commands. |
1450 | * | |
1451 | * Notes: | |
1452 | * Try a target reset. | |
1453 | */ | |
1454 | static int scsi_eh_target_reset(struct Scsi_Host *shost, | |
1455 | struct list_head *work_q, | |
1456 | struct list_head *done_q) | |
1457 | { | |
98db5195 | 1458 | LIST_HEAD(tmp_list); |
3eef6257 | 1459 | LIST_HEAD(check_list); |
30bd7df8 | 1460 | |
98db5195 JB |
1461 | list_splice_init(work_q, &tmp_list); |
1462 | ||
1463 | while (!list_empty(&tmp_list)) { | |
1464 | struct scsi_cmnd *next, *scmd; | |
1465 | int rtn; | |
1466 | unsigned int id; | |
b4562022 | 1467 | |
b4562022 | 1468 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 HR |
1469 | /* push back on work queue for further processing */ |
1470 | list_splice_init(&check_list, work_q); | |
1471 | list_splice_init(&tmp_list, work_q); | |
1472 | SCSI_LOG_ERROR_RECOVERY(3, | |
1473 | shost_printk(KERN_INFO, shost, | |
a222b1e2 HR |
1474 | "%s: Skip target reset, past eh deadline\n", |
1475 | current->comm)); | |
b4562022 HR |
1476 | return list_empty(work_q); |
1477 | } | |
98db5195 JB |
1478 | |
1479 | scmd = list_entry(tmp_list.next, struct scsi_cmnd, eh_entry); | |
1480 | id = scmd_id(scmd); | |
30bd7df8 | 1481 | |
91921e01 HR |
1482 | SCSI_LOG_ERROR_RECOVERY(3, |
1483 | shost_printk(KERN_INFO, shost, | |
1484 | "%s: Sending target reset to target %d\n", | |
1485 | current->comm, id)); | |
98db5195 JB |
1486 | rtn = scsi_try_target_reset(scmd); |
1487 | if (rtn != SUCCESS && rtn != FAST_IO_FAIL) | |
91921e01 HR |
1488 | SCSI_LOG_ERROR_RECOVERY(3, |
1489 | shost_printk(KERN_INFO, shost, | |
1490 | "%s: Target reset failed" | |
1491 | " target: %d\n", | |
1492 | current->comm, id)); | |
98db5195 JB |
1493 | list_for_each_entry_safe(scmd, next, &tmp_list, eh_entry) { |
1494 | if (scmd_id(scmd) != id) | |
1495 | continue; | |
1496 | ||
3eef6257 DJ |
1497 | if (rtn == SUCCESS) |
1498 | list_move_tail(&scmd->eh_entry, &check_list); | |
1499 | else if (rtn == FAST_IO_FAIL) | |
98db5195 JB |
1500 | scsi_eh_finish_cmd(scmd, done_q); |
1501 | else | |
1502 | /* push back on work queue for further processing */ | |
1503 | list_move(&scmd->eh_entry, work_q); | |
1504 | } | |
1505 | } | |
30bd7df8 | 1506 | |
3eef6257 | 1507 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
30bd7df8 MC |
1508 | } |
1509 | ||
1da177e4 | 1510 | /** |
0bf8c869 | 1511 | * scsi_eh_bus_reset - send a bus reset |
eb44820c | 1512 | * @shost: &scsi host being recovered. |
74cf298f | 1513 | * @work_q: &list_head for pending commands. |
eb44820c | 1514 | * @done_q: &list_head for processed commands. |
dc8875e1 | 1515 | */ |
1da177e4 LT |
1516 | static int scsi_eh_bus_reset(struct Scsi_Host *shost, |
1517 | struct list_head *work_q, | |
1518 | struct list_head *done_q) | |
1519 | { | |
937abeaa | 1520 | struct scsi_cmnd *scmd, *chan_scmd, *next; |
3eef6257 | 1521 | LIST_HEAD(check_list); |
1da177e4 LT |
1522 | unsigned int channel; |
1523 | int rtn; | |
1524 | ||
1525 | /* | |
1526 | * we really want to loop over the various channels, and do this on | |
1527 | * a channel by channel basis. we should also check to see if any | |
1528 | * of the failed commands are on soft_reset devices, and if so, skip | |
0bf8c869 | 1529 | * the reset. |
1da177e4 LT |
1530 | */ |
1531 | ||
1532 | for (channel = 0; channel <= shost->max_channel; channel++) { | |
b4562022 | 1533 | if (scsi_host_eh_past_deadline(shost)) { |
b4562022 HR |
1534 | list_splice_init(&check_list, work_q); |
1535 | SCSI_LOG_ERROR_RECOVERY(3, | |
1536 | shost_printk(KERN_INFO, shost, | |
a222b1e2 HR |
1537 | "%s: skip BRST, past eh deadline\n", |
1538 | current->comm)); | |
b4562022 HR |
1539 | return list_empty(work_q); |
1540 | } | |
b4562022 | 1541 | |
1da177e4 LT |
1542 | chan_scmd = NULL; |
1543 | list_for_each_entry(scmd, work_q, eh_entry) { | |
422c0d61 | 1544 | if (channel == scmd_channel(scmd)) { |
1da177e4 LT |
1545 | chan_scmd = scmd; |
1546 | break; | |
1547 | /* | |
1548 | * FIXME add back in some support for | |
1549 | * soft_reset devices. | |
1550 | */ | |
1551 | } | |
1552 | } | |
1553 | ||
1554 | if (!chan_scmd) | |
1555 | continue; | |
91921e01 HR |
1556 | SCSI_LOG_ERROR_RECOVERY(3, |
1557 | shost_printk(KERN_INFO, shost, | |
1558 | "%s: Sending BRST chan: %d\n", | |
1559 | current->comm, channel)); | |
1da177e4 | 1560 | rtn = scsi_try_bus_reset(chan_scmd); |
2f2eb587 | 1561 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
937abeaa | 1562 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3eef6257 DJ |
1563 | if (channel == scmd_channel(scmd)) { |
1564 | if (rtn == FAST_IO_FAIL) | |
1da177e4 LT |
1565 | scsi_eh_finish_cmd(scmd, |
1566 | done_q); | |
3eef6257 DJ |
1567 | else |
1568 | list_move_tail(&scmd->eh_entry, | |
1569 | &check_list); | |
1570 | } | |
1da177e4 LT |
1571 | } |
1572 | } else { | |
91921e01 HR |
1573 | SCSI_LOG_ERROR_RECOVERY(3, |
1574 | shost_printk(KERN_INFO, shost, | |
1575 | "%s: BRST failed chan: %d\n", | |
1576 | current->comm, channel)); | |
1da177e4 LT |
1577 | } |
1578 | } | |
3eef6257 | 1579 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4 LT |
1580 | } |
1581 | ||
1582 | /** | |
0bf8c869 | 1583 | * scsi_eh_host_reset - send a host reset |
74cf298f RD |
1584 | * @shost: host to be reset. |
1585 | * @work_q: &list_head for pending commands. | |
1586 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1587 | */ |
91921e01 HR |
1588 | static int scsi_eh_host_reset(struct Scsi_Host *shost, |
1589 | struct list_head *work_q, | |
1da177e4 LT |
1590 | struct list_head *done_q) |
1591 | { | |
937abeaa | 1592 | struct scsi_cmnd *scmd, *next; |
3eef6257 | 1593 | LIST_HEAD(check_list); |
1da177e4 | 1594 | int rtn; |
1da177e4 LT |
1595 | |
1596 | if (!list_empty(work_q)) { | |
1597 | scmd = list_entry(work_q->next, | |
1598 | struct scsi_cmnd, eh_entry); | |
1599 | ||
91921e01 HR |
1600 | SCSI_LOG_ERROR_RECOVERY(3, |
1601 | shost_printk(KERN_INFO, shost, | |
1602 | "%s: Sending HRST\n", | |
1603 | current->comm)); | |
1da177e4 LT |
1604 | |
1605 | rtn = scsi_try_host_reset(scmd); | |
3eef6257 DJ |
1606 | if (rtn == SUCCESS) { |
1607 | list_splice_init(work_q, &check_list); | |
1608 | } else if (rtn == FAST_IO_FAIL) { | |
937abeaa | 1609 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1da177e4 LT |
1610 | scsi_eh_finish_cmd(scmd, done_q); |
1611 | } | |
1612 | } else { | |
91921e01 HR |
1613 | SCSI_LOG_ERROR_RECOVERY(3, |
1614 | shost_printk(KERN_INFO, shost, | |
1615 | "%s: HRST failed\n", | |
1616 | current->comm)); | |
1da177e4 LT |
1617 | } |
1618 | } | |
3eef6257 | 1619 | return scsi_eh_test_devices(&check_list, work_q, done_q, 1); |
1da177e4 LT |
1620 | } |
1621 | ||
1622 | /** | |
1623 | * scsi_eh_offline_sdevs - offline scsi devices that fail to recover | |
74cf298f RD |
1624 | * @work_q: &list_head for pending commands. |
1625 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1626 | */ |
1da177e4 LT |
1627 | static void scsi_eh_offline_sdevs(struct list_head *work_q, |
1628 | struct list_head *done_q) | |
1629 | { | |
937abeaa | 1630 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1631 | |
937abeaa | 1632 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
31765d7d MW |
1633 | sdev_printk(KERN_INFO, scmd->device, "Device offlined - " |
1634 | "not ready after error recovery\n"); | |
1da177e4 | 1635 | scsi_device_set_state(scmd->device, SDEV_OFFLINE); |
1da177e4 LT |
1636 | scsi_eh_finish_cmd(scmd, done_q); |
1637 | } | |
1638 | return; | |
1639 | } | |
1640 | ||
4a27446f | 1641 | /** |
e494f6a7 | 1642 | * scsi_noretry_cmd - determine if command should be failed fast |
4a27446f MC |
1643 | * @scmd: SCSI cmd to examine. |
1644 | */ | |
1645 | int scsi_noretry_cmd(struct scsi_cmnd *scmd) | |
1646 | { | |
1647 | switch (host_byte(scmd->result)) { | |
1648 | case DID_OK: | |
1649 | break; | |
e494f6a7 HR |
1650 | case DID_TIME_OUT: |
1651 | goto check_type; | |
4a27446f | 1652 | case DID_BUS_BUSY: |
33659ebb | 1653 | return (scmd->request->cmd_flags & REQ_FAILFAST_TRANSPORT); |
4a27446f | 1654 | case DID_PARITY: |
33659ebb | 1655 | return (scmd->request->cmd_flags & REQ_FAILFAST_DEV); |
4a27446f MC |
1656 | case DID_ERROR: |
1657 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1658 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1659 | return 0; | |
1660 | /* fall through */ | |
1661 | case DID_SOFT_ERROR: | |
33659ebb | 1662 | return (scmd->request->cmd_flags & REQ_FAILFAST_DRIVER); |
4a27446f MC |
1663 | } |
1664 | ||
e494f6a7 HR |
1665 | if (status_byte(scmd->result) != CHECK_CONDITION) |
1666 | return 0; | |
4a27446f | 1667 | |
e494f6a7 HR |
1668 | check_type: |
1669 | /* | |
1670 | * assume caller has checked sense and determined | |
1671 | * the check condition was retryable. | |
1672 | */ | |
1673 | if (scmd->request->cmd_flags & REQ_FAILFAST_DEV || | |
57292b58 | 1674 | blk_rq_is_passthrough(scmd->request)) |
e494f6a7 HR |
1675 | return 1; |
1676 | else | |
1677 | return 0; | |
4a27446f MC |
1678 | } |
1679 | ||
1da177e4 LT |
1680 | /** |
1681 | * scsi_decide_disposition - Disposition a cmd on return from LLD. | |
1682 | * @scmd: SCSI cmd to examine. | |
1683 | * | |
1684 | * Notes: | |
1685 | * This is *only* called when we are examining the status after sending | |
1686 | * out the actual data command. any commands that are queued for error | |
1687 | * recovery (e.g. test_unit_ready) do *not* come through here. | |
1688 | * | |
1689 | * When this routine returns failed, it means the error handler thread | |
1690 | * is woken. In cases where the error code indicates an error that | |
1691 | * doesn't require the error handler read (i.e. we don't need to | |
1692 | * abort/reset), this function should return SUCCESS. | |
dc8875e1 | 1693 | */ |
1da177e4 LT |
1694 | int scsi_decide_disposition(struct scsi_cmnd *scmd) |
1695 | { | |
1696 | int rtn; | |
1697 | ||
1698 | /* | |
1699 | * if the device is offline, then we clearly just pass the result back | |
1700 | * up to the top level. | |
1701 | */ | |
1702 | if (!scsi_device_online(scmd->device)) { | |
91921e01 HR |
1703 | SCSI_LOG_ERROR_RECOVERY(5, scmd_printk(KERN_INFO, scmd, |
1704 | "%s: device offline - report as SUCCESS\n", __func__)); | |
1da177e4 LT |
1705 | return SUCCESS; |
1706 | } | |
1707 | ||
1708 | /* | |
1709 | * first check the host byte, to see if there is anything in there | |
1710 | * that would indicate what we need to do. | |
1711 | */ | |
1712 | switch (host_byte(scmd->result)) { | |
1713 | case DID_PASSTHROUGH: | |
1714 | /* | |
1715 | * no matter what, pass this through to the upper layer. | |
1716 | * nuke this special code so that it looks like we are saying | |
1717 | * did_ok. | |
1718 | */ | |
1719 | scmd->result &= 0xff00ffff; | |
1720 | return SUCCESS; | |
1721 | case DID_OK: | |
1722 | /* | |
1723 | * looks good. drop through, and check the next byte. | |
1724 | */ | |
1725 | break; | |
e494f6a7 HR |
1726 | case DID_ABORT: |
1727 | if (scmd->eh_eflags & SCSI_EH_ABORT_SCHEDULED) { | |
8922a908 | 1728 | set_host_byte(scmd, DID_TIME_OUT); |
e494f6a7 HR |
1729 | return SUCCESS; |
1730 | } | |
1da177e4 LT |
1731 | case DID_NO_CONNECT: |
1732 | case DID_BAD_TARGET: | |
1da177e4 LT |
1733 | /* |
1734 | * note - this means that we just report the status back | |
1735 | * to the top level driver, not that we actually think | |
1736 | * that it indicates SUCCESS. | |
1737 | */ | |
1738 | return SUCCESS; | |
1739 | /* | |
1740 | * when the low level driver returns did_soft_error, | |
0bf8c869 | 1741 | * it is responsible for keeping an internal retry counter |
1da177e4 LT |
1742 | * in order to avoid endless loops (db) |
1743 | * | |
1744 | * actually this is a bug in this function here. we should | |
1745 | * be mindful of the maximum number of retries specified | |
1746 | * and not get stuck in a loop. | |
1747 | */ | |
1748 | case DID_SOFT_ERROR: | |
1749 | goto maybe_retry; | |
1750 | case DID_IMM_RETRY: | |
1751 | return NEEDS_RETRY; | |
1752 | ||
bf341919 JB |
1753 | case DID_REQUEUE: |
1754 | return ADD_TO_MLQUEUE; | |
a4dfaa6f MC |
1755 | case DID_TRANSPORT_DISRUPTED: |
1756 | /* | |
1757 | * LLD/transport was disrupted during processing of the IO. | |
1758 | * The transport class is now blocked/blocking, | |
1759 | * and the transport will decide what to do with the IO | |
939c2288 MC |
1760 | * based on its timers and recovery capablilities if |
1761 | * there are enough retries. | |
a4dfaa6f | 1762 | */ |
939c2288 | 1763 | goto maybe_retry; |
a4dfaa6f MC |
1764 | case DID_TRANSPORT_FAILFAST: |
1765 | /* | |
1766 | * The transport decided to failfast the IO (most likely | |
1767 | * the fast io fail tmo fired), so send IO directly upwards. | |
1768 | */ | |
1769 | return SUCCESS; | |
1da177e4 LT |
1770 | case DID_ERROR: |
1771 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1772 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1773 | /* | |
1774 | * execute reservation conflict processing code | |
1775 | * lower down | |
1776 | */ | |
1777 | break; | |
1778 | /* fallthrough */ | |
1da177e4 LT |
1779 | case DID_BUS_BUSY: |
1780 | case DID_PARITY: | |
1781 | goto maybe_retry; | |
1782 | case DID_TIME_OUT: | |
1783 | /* | |
1784 | * when we scan the bus, we get timeout messages for | |
1785 | * these commands if there is no device available. | |
1786 | * other hosts report did_no_connect for the same thing. | |
1787 | */ | |
1788 | if ((scmd->cmnd[0] == TEST_UNIT_READY || | |
1789 | scmd->cmnd[0] == INQUIRY)) { | |
1790 | return SUCCESS; | |
1791 | } else { | |
1792 | return FAILED; | |
1793 | } | |
1794 | case DID_RESET: | |
1795 | return SUCCESS; | |
1796 | default: | |
1797 | return FAILED; | |
1798 | } | |
1799 | ||
1800 | /* | |
1801 | * next, check the message byte. | |
1802 | */ | |
1803 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
1804 | return FAILED; | |
1805 | ||
1806 | /* | |
1807 | * check the status byte to see if this indicates anything special. | |
1808 | */ | |
1809 | switch (status_byte(scmd->result)) { | |
1810 | case QUEUE_FULL: | |
42a6a918 | 1811 | scsi_handle_queue_full(scmd->device); |
1da177e4 LT |
1812 | /* |
1813 | * the case of trying to send too many commands to a | |
1814 | * tagged queueing device. | |
1815 | */ | |
1816 | case BUSY: | |
1817 | /* | |
1818 | * device can't talk to us at the moment. Should only | |
1819 | * occur (SAM-3) when the task queue is empty, so will cause | |
1820 | * the empty queue handling to trigger a stall in the | |
1821 | * device. | |
1822 | */ | |
1823 | return ADD_TO_MLQUEUE; | |
1824 | case GOOD: | |
279afdfe EM |
1825 | if (scmd->cmnd[0] == REPORT_LUNS) |
1826 | scmd->device->sdev_target->expecting_lun_change = 0; | |
4a84067d | 1827 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 | 1828 | case COMMAND_TERMINATED: |
1da177e4 | 1829 | return SUCCESS; |
a9b589d9 VB |
1830 | case TASK_ABORTED: |
1831 | goto maybe_retry; | |
1da177e4 LT |
1832 | case CHECK_CONDITION: |
1833 | rtn = scsi_check_sense(scmd); | |
1834 | if (rtn == NEEDS_RETRY) | |
1835 | goto maybe_retry; | |
1836 | /* if rtn == FAILED, we have no sense information; | |
1837 | * returning FAILED will wake the error handler thread | |
1838 | * to collect the sense and redo the decide | |
1839 | * disposition */ | |
1840 | return rtn; | |
1841 | case CONDITION_GOOD: | |
1842 | case INTERMEDIATE_GOOD: | |
1843 | case INTERMEDIATE_C_GOOD: | |
1844 | case ACA_ACTIVE: | |
1845 | /* | |
1846 | * who knows? FIXME(eric) | |
1847 | */ | |
1848 | return SUCCESS; | |
1849 | ||
1850 | case RESERVATION_CONFLICT: | |
9ccfc756 JB |
1851 | sdev_printk(KERN_INFO, scmd->device, |
1852 | "reservation conflict\n"); | |
2082ebc4 | 1853 | set_host_byte(scmd, DID_NEXUS_FAILURE); |
1da177e4 LT |
1854 | return SUCCESS; /* causes immediate i/o error */ |
1855 | default: | |
1856 | return FAILED; | |
1857 | } | |
1858 | return FAILED; | |
1859 | ||
1860 | maybe_retry: | |
1861 | ||
1862 | /* we requeue for retry because the error was retryable, and | |
1863 | * the request was not marked fast fail. Note that above, | |
1864 | * even if the request is marked fast fail, we still requeue | |
1865 | * for queue congestion conditions (QUEUE_FULL or BUSY) */ | |
8884efab | 1866 | if ((++scmd->retries) <= scmd->allowed |
4a27446f | 1867 | && !scsi_noretry_cmd(scmd)) { |
1da177e4 LT |
1868 | return NEEDS_RETRY; |
1869 | } else { | |
1870 | /* | |
1871 | * no more retries - report this one back to upper level. | |
1872 | */ | |
1873 | return SUCCESS; | |
1874 | } | |
1875 | } | |
1876 | ||
f078727b FT |
1877 | static void eh_lock_door_done(struct request *req, int uptodate) |
1878 | { | |
1879 | __blk_put_request(req->q, req); | |
1880 | } | |
1881 | ||
1da177e4 LT |
1882 | /** |
1883 | * scsi_eh_lock_door - Prevent medium removal for the specified device | |
1884 | * @sdev: SCSI device to prevent medium removal | |
1885 | * | |
1886 | * Locking: | |
91bc31fb | 1887 | * We must be called from process context. |
1da177e4 LT |
1888 | * |
1889 | * Notes: | |
1890 | * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the | |
1891 | * head of the devices request queue, and continue. | |
dc8875e1 | 1892 | */ |
1da177e4 LT |
1893 | static void scsi_eh_lock_door(struct scsi_device *sdev) |
1894 | { | |
f078727b | 1895 | struct request *req; |
82ed4db4 | 1896 | struct scsi_request *rq; |
1da177e4 | 1897 | |
91bc31fb | 1898 | /* |
71baba4b | 1899 | * blk_get_request with GFP_KERNEL (__GFP_RECLAIM) sleeps until a |
91bc31fb JB |
1900 | * request becomes available |
1901 | */ | |
aebf526b | 1902 | req = blk_get_request(sdev->request_queue, REQ_OP_SCSI_IN, GFP_KERNEL); |
a492f075 | 1903 | if (IS_ERR(req)) |
eb571eea | 1904 | return; |
82ed4db4 CH |
1905 | rq = scsi_req(req); |
1906 | scsi_req_init(req); | |
1da177e4 | 1907 | |
82ed4db4 CH |
1908 | rq->cmd[0] = ALLOW_MEDIUM_REMOVAL; |
1909 | rq->cmd[1] = 0; | |
1910 | rq->cmd[2] = 0; | |
1911 | rq->cmd[3] = 0; | |
1912 | rq->cmd[4] = SCSI_REMOVAL_PREVENT; | |
1913 | rq->cmd[5] = 0; | |
1914 | rq->cmd_len = COMMAND_SIZE(rq->cmd[0]); | |
f078727b | 1915 | |
e8064021 | 1916 | req->rq_flags |= RQF_QUIET; |
f078727b | 1917 | req->timeout = 10 * HZ; |
64c7f1d1 | 1918 | rq->retries = 5; |
f078727b FT |
1919 | |
1920 | blk_execute_rq_nowait(req->q, NULL, req, 1, eh_lock_door_done); | |
1921 | } | |
1da177e4 LT |
1922 | |
1923 | /** | |
1924 | * scsi_restart_operations - restart io operations to the specified host. | |
1925 | * @shost: Host we are restarting. | |
1926 | * | |
1927 | * Notes: | |
1928 | * When we entered the error handler, we blocked all further i/o to | |
1929 | * this device. we need to 'reverse' this process. | |
dc8875e1 | 1930 | */ |
1da177e4 LT |
1931 | static void scsi_restart_operations(struct Scsi_Host *shost) |
1932 | { | |
1933 | struct scsi_device *sdev; | |
939647ee | 1934 | unsigned long flags; |
1da177e4 LT |
1935 | |
1936 | /* | |
1937 | * If the door was locked, we need to insert a door lock request | |
1938 | * onto the head of the SCSI request queue for the device. There | |
1939 | * is no point trying to lock the door of an off-line device. | |
1940 | */ | |
1941 | shost_for_each_device(sdev, shost) { | |
48379270 | 1942 | if (scsi_device_online(sdev) && sdev->was_reset && sdev->locked) { |
1da177e4 | 1943 | scsi_eh_lock_door(sdev); |
48379270 CH |
1944 | sdev->was_reset = 0; |
1945 | } | |
1da177e4 LT |
1946 | } |
1947 | ||
1948 | /* | |
1949 | * next free up anything directly waiting upon the host. this | |
1950 | * will be requests for character device operations, and also for | |
1951 | * ioctls to queued block devices. | |
1952 | */ | |
b4562022 | 1953 | SCSI_LOG_ERROR_RECOVERY(3, |
91921e01 | 1954 | shost_printk(KERN_INFO, shost, "waking up host to restart\n")); |
1da177e4 | 1955 | |
939647ee JB |
1956 | spin_lock_irqsave(shost->host_lock, flags); |
1957 | if (scsi_host_set_state(shost, SHOST_RUNNING)) | |
1958 | if (scsi_host_set_state(shost, SHOST_CANCEL)) | |
1959 | BUG_ON(scsi_host_set_state(shost, SHOST_DEL)); | |
1960 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
1961 | |
1962 | wake_up(&shost->host_wait); | |
1963 | ||
1964 | /* | |
1965 | * finally we need to re-initiate requests that may be pending. we will | |
1966 | * have had everything blocked while error handling is taking place, and | |
1967 | * now that error recovery is done, we will need to ensure that these | |
1968 | * requests are started. | |
1969 | */ | |
1970 | scsi_run_host_queues(shost); | |
57fc2e33 DW |
1971 | |
1972 | /* | |
1973 | * if eh is active and host_eh_scheduled is pending we need to re-run | |
1974 | * recovery. we do this check after scsi_run_host_queues() to allow | |
1975 | * everything pent up since the last eh run a chance to make forward | |
1976 | * progress before we sync again. Either we'll immediately re-run | |
1977 | * recovery or scsi_device_unbusy() will wake us again when these | |
1978 | * pending commands complete. | |
1979 | */ | |
1980 | spin_lock_irqsave(shost->host_lock, flags); | |
1981 | if (shost->host_eh_scheduled) | |
1982 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) | |
1983 | WARN_ON(scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)); | |
1984 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
1985 | } |
1986 | ||
1987 | /** | |
1988 | * scsi_eh_ready_devs - check device ready state and recover if not. | |
74cf298f RD |
1989 | * @shost: host to be recovered. |
1990 | * @work_q: &list_head for pending commands. | |
eb44820c | 1991 | * @done_q: &list_head for processed commands. |
dc8875e1 | 1992 | */ |
dca84e46 DW |
1993 | void scsi_eh_ready_devs(struct Scsi_Host *shost, |
1994 | struct list_head *work_q, | |
1995 | struct list_head *done_q) | |
1da177e4 LT |
1996 | { |
1997 | if (!scsi_eh_stu(shost, work_q, done_q)) | |
1998 | if (!scsi_eh_bus_device_reset(shost, work_q, done_q)) | |
30bd7df8 MC |
1999 | if (!scsi_eh_target_reset(shost, work_q, done_q)) |
2000 | if (!scsi_eh_bus_reset(shost, work_q, done_q)) | |
91921e01 | 2001 | if (!scsi_eh_host_reset(shost, work_q, done_q)) |
30bd7df8 MC |
2002 | scsi_eh_offline_sdevs(work_q, |
2003 | done_q); | |
1da177e4 | 2004 | } |
dca84e46 | 2005 | EXPORT_SYMBOL_GPL(scsi_eh_ready_devs); |
1da177e4 LT |
2006 | |
2007 | /** | |
2008 | * scsi_eh_flush_done_q - finish processed commands or retry them. | |
2009 | * @done_q: list_head of processed commands. | |
dc8875e1 | 2010 | */ |
041c5fc3 | 2011 | void scsi_eh_flush_done_q(struct list_head *done_q) |
1da177e4 | 2012 | { |
937abeaa | 2013 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 2014 | |
937abeaa CH |
2015 | list_for_each_entry_safe(scmd, next, done_q, eh_entry) { |
2016 | list_del_init(&scmd->eh_entry); | |
1da177e4 | 2017 | if (scsi_device_online(scmd->device) && |
4a27446f | 2018 | !scsi_noretry_cmd(scmd) && |
8884efab | 2019 | (++scmd->retries <= scmd->allowed)) { |
91921e01 HR |
2020 | SCSI_LOG_ERROR_RECOVERY(3, |
2021 | scmd_printk(KERN_INFO, scmd, | |
470613b4 HR |
2022 | "%s: flush retry cmd\n", |
2023 | current->comm)); | |
1da177e4 LT |
2024 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); |
2025 | } else { | |
793698ce PM |
2026 | /* |
2027 | * If just we got sense for the device (called | |
2028 | * scsi_eh_get_sense), scmd->result is already | |
2029 | * set, do not set DRIVER_TIMEOUT. | |
2030 | */ | |
1da177e4 LT |
2031 | if (!scmd->result) |
2032 | scmd->result |= (DRIVER_TIMEOUT << 24); | |
91921e01 HR |
2033 | SCSI_LOG_ERROR_RECOVERY(3, |
2034 | scmd_printk(KERN_INFO, scmd, | |
470613b4 HR |
2035 | "%s: flush finish cmd\n", |
2036 | current->comm)); | |
1da177e4 LT |
2037 | scsi_finish_command(scmd); |
2038 | } | |
2039 | } | |
2040 | } | |
041c5fc3 | 2041 | EXPORT_SYMBOL(scsi_eh_flush_done_q); |
1da177e4 LT |
2042 | |
2043 | /** | |
2044 | * scsi_unjam_host - Attempt to fix a host which has a cmd that failed. | |
2045 | * @shost: Host to unjam. | |
2046 | * | |
2047 | * Notes: | |
2048 | * When we come in here, we *know* that all commands on the bus have | |
2049 | * either completed, failed or timed out. we also know that no further | |
2050 | * commands are being sent to the host, so things are relatively quiet | |
2051 | * and we have freedom to fiddle with things as we wish. | |
2052 | * | |
2053 | * This is only the *default* implementation. it is possible for | |
2054 | * individual drivers to supply their own version of this function, and | |
2055 | * if the maintainer wishes to do this, it is strongly suggested that | |
2056 | * this function be taken as a template and modified. this function | |
2057 | * was designed to correctly handle problems for about 95% of the | |
2058 | * different cases out there, and it should always provide at least a | |
2059 | * reasonable amount of error recovery. | |
2060 | * | |
2061 | * Any command marked 'failed' or 'timeout' must eventually have | |
2062 | * scsi_finish_cmd() called for it. we do all of the retry stuff | |
2063 | * here, so when we restart the host after we return it should have an | |
2064 | * empty queue. | |
dc8875e1 | 2065 | */ |
1da177e4 LT |
2066 | static void scsi_unjam_host(struct Scsi_Host *shost) |
2067 | { | |
2068 | unsigned long flags; | |
2069 | LIST_HEAD(eh_work_q); | |
2070 | LIST_HEAD(eh_done_q); | |
2071 | ||
2072 | spin_lock_irqsave(shost->host_lock, flags); | |
2073 | list_splice_init(&shost->eh_cmd_q, &eh_work_q); | |
2074 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2075 | ||
2076 | SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost, &eh_work_q)); | |
2077 | ||
2078 | if (!scsi_eh_get_sense(&eh_work_q, &eh_done_q)) | |
a0658632 | 2079 | scsi_eh_ready_devs(shost, &eh_work_q, &eh_done_q); |
1da177e4 | 2080 | |
b4562022 | 2081 | spin_lock_irqsave(shost->host_lock, flags); |
bb3b621a | 2082 | if (shost->eh_deadline != -1) |
b4562022 HR |
2083 | shost->last_reset = 0; |
2084 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
2085 | scsi_eh_flush_done_q(&eh_done_q); |
2086 | } | |
2087 | ||
2088 | /** | |
ad42eb1b | 2089 | * scsi_error_handler - SCSI error handler thread |
1da177e4 LT |
2090 | * @data: Host for which we are running. |
2091 | * | |
2092 | * Notes: | |
ad42eb1b CH |
2093 | * This is the main error handling loop. This is run as a kernel thread |
2094 | * for every SCSI host and handles all error handling activity. | |
dc8875e1 | 2095 | */ |
1da177e4 LT |
2096 | int scsi_error_handler(void *data) |
2097 | { | |
ad42eb1b | 2098 | struct Scsi_Host *shost = data; |
1da177e4 | 2099 | |
1da177e4 | 2100 | /* |
ad42eb1b CH |
2101 | * We use TASK_INTERRUPTIBLE so that the thread is not |
2102 | * counted against the load average as a running process. | |
2103 | * We never actually get interrupted because kthread_run | |
c03264a7 | 2104 | * disables signal delivery for the created thread. |
1da177e4 | 2105 | */ |
537b604c MH |
2106 | while (true) { |
2107 | /* | |
2108 | * The sequence in kthread_stop() sets the stop flag first | |
2109 | * then wakes the process. To avoid missed wakeups, the task | |
2110 | * should always be in a non running state before the stop | |
2111 | * flag is checked | |
2112 | */ | |
b9d5c6b7 | 2113 | set_current_state(TASK_INTERRUPTIBLE); |
537b604c MH |
2114 | if (kthread_should_stop()) |
2115 | break; | |
2116 | ||
ee7863bc | 2117 | if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) || |
74665016 | 2118 | shost->host_failed != atomic_read(&shost->host_busy)) { |
ad42eb1b | 2119 | SCSI_LOG_ERROR_RECOVERY(1, |
91921e01 HR |
2120 | shost_printk(KERN_INFO, shost, |
2121 | "scsi_eh_%d: sleeping\n", | |
2122 | shost->host_no)); | |
3ed7a470 | 2123 | schedule(); |
3ed7a470 JB |
2124 | continue; |
2125 | } | |
1da177e4 | 2126 | |
3ed7a470 | 2127 | __set_current_state(TASK_RUNNING); |
ad42eb1b | 2128 | SCSI_LOG_ERROR_RECOVERY(1, |
91921e01 HR |
2129 | shost_printk(KERN_INFO, shost, |
2130 | "scsi_eh_%d: waking up %d/%d/%d\n", | |
2131 | shost->host_no, shost->host_eh_scheduled, | |
74665016 CH |
2132 | shost->host_failed, |
2133 | atomic_read(&shost->host_busy))); | |
1da177e4 | 2134 | |
1da177e4 LT |
2135 | /* |
2136 | * We have a host that is failing for some reason. Figure out | |
2137 | * what we need to do to get it up and online again (if we can). | |
2138 | * If we fail, we end up taking the thing offline. | |
2139 | */ | |
ae0751ff | 2140 | if (!shost->eh_noresume && scsi_autopm_get_host(shost) != 0) { |
bc4f2401 | 2141 | SCSI_LOG_ERROR_RECOVERY(1, |
a222b1e2 HR |
2142 | shost_printk(KERN_ERR, shost, |
2143 | "scsi_eh_%d: unable to autoresume\n", | |
2144 | shost->host_no)); | |
bc4f2401 AS |
2145 | continue; |
2146 | } | |
2147 | ||
9227c33d CH |
2148 | if (shost->transportt->eh_strategy_handler) |
2149 | shost->transportt->eh_strategy_handler(shost); | |
1da177e4 LT |
2150 | else |
2151 | scsi_unjam_host(shost); | |
2152 | ||
72d8c36e WF |
2153 | /* All scmds have been handled */ |
2154 | shost->host_failed = 0; | |
2155 | ||
1da177e4 LT |
2156 | /* |
2157 | * Note - if the above fails completely, the action is to take | |
2158 | * individual devices offline and flush the queue of any | |
2159 | * outstanding requests that may have been pending. When we | |
2160 | * restart, we restart any I/O to any other devices on the bus | |
2161 | * which are still online. | |
2162 | */ | |
2163 | scsi_restart_operations(shost); | |
ae0751ff LM |
2164 | if (!shost->eh_noresume) |
2165 | scsi_autopm_put_host(shost); | |
1da177e4 | 2166 | } |
461a0ffb SR |
2167 | __set_current_state(TASK_RUNNING); |
2168 | ||
ad42eb1b | 2169 | SCSI_LOG_ERROR_RECOVERY(1, |
91921e01 HR |
2170 | shost_printk(KERN_INFO, shost, |
2171 | "Error handler scsi_eh_%d exiting\n", | |
2172 | shost->host_no)); | |
3ed7a470 | 2173 | shost->ehandler = NULL; |
1da177e4 LT |
2174 | return 0; |
2175 | } | |
2176 | ||
2177 | /* | |
2178 | * Function: scsi_report_bus_reset() | |
2179 | * | |
2180 | * Purpose: Utility function used by low-level drivers to report that | |
2181 | * they have observed a bus reset on the bus being handled. | |
2182 | * | |
2183 | * Arguments: shost - Host in question | |
2184 | * channel - channel on which reset was observed. | |
2185 | * | |
2186 | * Returns: Nothing | |
2187 | * | |
2188 | * Lock status: Host lock must be held. | |
2189 | * | |
2190 | * Notes: This only needs to be called if the reset is one which | |
2191 | * originates from an unknown location. Resets originated | |
2192 | * by the mid-level itself don't need to call this, but there | |
2193 | * should be no harm. | |
2194 | * | |
2195 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
2196 | * is properly treated. | |
2197 | */ | |
2198 | void scsi_report_bus_reset(struct Scsi_Host *shost, int channel) | |
2199 | { | |
2200 | struct scsi_device *sdev; | |
2201 | ||
2202 | __shost_for_each_device(sdev, shost) { | |
30bd7df8 MC |
2203 | if (channel == sdev_channel(sdev)) |
2204 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
2205 | } |
2206 | } | |
2207 | EXPORT_SYMBOL(scsi_report_bus_reset); | |
2208 | ||
2209 | /* | |
2210 | * Function: scsi_report_device_reset() | |
2211 | * | |
2212 | * Purpose: Utility function used by low-level drivers to report that | |
2213 | * they have observed a device reset on the device being handled. | |
2214 | * | |
2215 | * Arguments: shost - Host in question | |
2216 | * channel - channel on which reset was observed | |
2217 | * target - target on which reset was observed | |
2218 | * | |
2219 | * Returns: Nothing | |
2220 | * | |
2221 | * Lock status: Host lock must be held | |
2222 | * | |
2223 | * Notes: This only needs to be called if the reset is one which | |
2224 | * originates from an unknown location. Resets originated | |
2225 | * by the mid-level itself don't need to call this, but there | |
2226 | * should be no harm. | |
2227 | * | |
2228 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
2229 | * is properly treated. | |
2230 | */ | |
2231 | void scsi_report_device_reset(struct Scsi_Host *shost, int channel, int target) | |
2232 | { | |
2233 | struct scsi_device *sdev; | |
2234 | ||
2235 | __shost_for_each_device(sdev, shost) { | |
422c0d61 | 2236 | if (channel == sdev_channel(sdev) && |
30bd7df8 MC |
2237 | target == sdev_id(sdev)) |
2238 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
2239 | } |
2240 | } | |
2241 | EXPORT_SYMBOL(scsi_report_device_reset); | |
2242 | ||
2243 | static void | |
2244 | scsi_reset_provider_done_command(struct scsi_cmnd *scmd) | |
2245 | { | |
2246 | } | |
2247 | ||
176aa9d6 CH |
2248 | /** |
2249 | * scsi_ioctl_reset: explicitly reset a host/bus/target/device | |
2250 | * @dev: scsi_device to operate on | |
2251 | * @arg: reset type (see sg.h) | |
1da177e4 LT |
2252 | */ |
2253 | int | |
176aa9d6 | 2254 | scsi_ioctl_reset(struct scsi_device *dev, int __user *arg) |
1da177e4 | 2255 | { |
bc4f2401 | 2256 | struct scsi_cmnd *scmd; |
d7a1bb0a | 2257 | struct Scsi_Host *shost = dev->host; |
e9c787e6 | 2258 | struct request *rq; |
d7a1bb0a | 2259 | unsigned long flags; |
176aa9d6 CH |
2260 | int error = 0, rtn, val; |
2261 | ||
2262 | if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) | |
2263 | return -EACCES; | |
2264 | ||
2265 | error = get_user(val, arg); | |
2266 | if (error) | |
2267 | return error; | |
1da177e4 | 2268 | |
bc4f2401 | 2269 | if (scsi_autopm_get_host(shost) < 0) |
176aa9d6 | 2270 | return -EIO; |
bc4f2401 | 2271 | |
176aa9d6 | 2272 | error = -EIO; |
e9c787e6 CH |
2273 | rq = kzalloc(sizeof(struct request) + sizeof(struct scsi_cmnd) + |
2274 | shost->hostt->cmd_size, GFP_KERNEL); | |
2275 | if (!rq) | |
95eeb5f5 | 2276 | goto out_put_autopm_host; |
e9c787e6 | 2277 | blk_rq_init(NULL, rq); |
95eeb5f5 | 2278 | |
e9c787e6 CH |
2279 | scmd = (struct scsi_cmnd *)(rq + 1); |
2280 | scsi_init_command(dev, scmd); | |
2281 | scmd->request = rq; | |
82ed4db4 | 2282 | scmd->cmnd = scsi_req(rq)->cmd; |
64a87b24 | 2283 | |
1da177e4 | 2284 | scmd->scsi_done = scsi_reset_provider_done_command; |
30b0c37b | 2285 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
1da177e4 LT |
2286 | |
2287 | scmd->cmd_len = 0; | |
2288 | ||
2289 | scmd->sc_data_direction = DMA_BIDIRECTIONAL; | |
1da177e4 | 2290 | |
d7a1bb0a JS |
2291 | spin_lock_irqsave(shost->host_lock, flags); |
2292 | shost->tmf_in_progress = 1; | |
2293 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2294 | ||
176aa9d6 CH |
2295 | switch (val & ~SG_SCSI_RESET_NO_ESCALATE) { |
2296 | case SG_SCSI_RESET_NOTHING: | |
2297 | rtn = SUCCESS; | |
2298 | break; | |
2299 | case SG_SCSI_RESET_DEVICE: | |
1da177e4 | 2300 | rtn = scsi_try_bus_device_reset(scmd); |
176aa9d6 | 2301 | if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE)) |
1da177e4 LT |
2302 | break; |
2303 | /* FALLTHROUGH */ | |
176aa9d6 | 2304 | case SG_SCSI_RESET_TARGET: |
30bd7df8 | 2305 | rtn = scsi_try_target_reset(scmd); |
176aa9d6 | 2306 | if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE)) |
30bd7df8 MC |
2307 | break; |
2308 | /* FALLTHROUGH */ | |
176aa9d6 | 2309 | case SG_SCSI_RESET_BUS: |
1da177e4 | 2310 | rtn = scsi_try_bus_reset(scmd); |
176aa9d6 | 2311 | if (rtn == SUCCESS || (val & SG_SCSI_RESET_NO_ESCALATE)) |
1da177e4 LT |
2312 | break; |
2313 | /* FALLTHROUGH */ | |
176aa9d6 | 2314 | case SG_SCSI_RESET_HOST: |
1da177e4 | 2315 | rtn = scsi_try_host_reset(scmd); |
176aa9d6 CH |
2316 | if (rtn == SUCCESS) |
2317 | break; | |
1da177e4 | 2318 | default: |
176aa9d6 | 2319 | /* FALLTHROUGH */ |
1da177e4 | 2320 | rtn = FAILED; |
176aa9d6 | 2321 | break; |
1da177e4 LT |
2322 | } |
2323 | ||
176aa9d6 CH |
2324 | error = (rtn == SUCCESS) ? 0 : -EIO; |
2325 | ||
d7a1bb0a JS |
2326 | spin_lock_irqsave(shost->host_lock, flags); |
2327 | shost->tmf_in_progress = 0; | |
2328 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2329 | ||
2330 | /* | |
2331 | * be sure to wake up anyone who was sleeping or had their queue | |
2332 | * suspended while we performed the TMF. | |
2333 | */ | |
2334 | SCSI_LOG_ERROR_RECOVERY(3, | |
91921e01 HR |
2335 | shost_printk(KERN_INFO, shost, |
2336 | "waking up host to restart after TMF\n")); | |
d7a1bb0a JS |
2337 | |
2338 | wake_up(&shost->host_wait); | |
d7a1bb0a JS |
2339 | scsi_run_host_queues(shost); |
2340 | ||
0f121dd8 | 2341 | scsi_put_command(scmd); |
e9c787e6 | 2342 | kfree(rq); |
0f121dd8 | 2343 | |
04796336 | 2344 | out_put_autopm_host: |
bc4f2401 | 2345 | scsi_autopm_put_host(shost); |
176aa9d6 | 2346 | return error; |
1da177e4 | 2347 | } |
176aa9d6 | 2348 | EXPORT_SYMBOL(scsi_ioctl_reset); |
1da177e4 | 2349 | |
4753cbc0 HR |
2350 | bool scsi_command_normalize_sense(const struct scsi_cmnd *cmd, |
2351 | struct scsi_sense_hdr *sshdr) | |
1da177e4 LT |
2352 | { |
2353 | return scsi_normalize_sense(cmd->sense_buffer, | |
b80ca4f7 | 2354 | SCSI_SENSE_BUFFERSIZE, sshdr); |
1da177e4 LT |
2355 | } |
2356 | EXPORT_SYMBOL(scsi_command_normalize_sense); | |
2357 | ||
1da177e4 | 2358 | /** |
eb44820c | 2359 | * scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor format) |
1da177e4 LT |
2360 | * @sense_buffer: byte array of sense data |
2361 | * @sb_len: number of valid bytes in sense_buffer | |
2362 | * @info_out: pointer to 64 integer where 8 or 4 byte information | |
2363 | * field will be placed if found. | |
2364 | * | |
2365 | * Return value: | |
2908769c | 2366 | * true if information field found, false if not found. |
dc8875e1 | 2367 | */ |
2908769c DLM |
2368 | bool scsi_get_sense_info_fld(const u8 *sense_buffer, int sb_len, |
2369 | u64 *info_out) | |
1da177e4 | 2370 | { |
1da177e4 | 2371 | const u8 * ucp; |
1da177e4 LT |
2372 | |
2373 | if (sb_len < 7) | |
2908769c | 2374 | return false; |
1da177e4 LT |
2375 | switch (sense_buffer[0] & 0x7f) { |
2376 | case 0x70: | |
2377 | case 0x71: | |
2378 | if (sense_buffer[0] & 0x80) { | |
2908769c DLM |
2379 | *info_out = get_unaligned_be32(&sense_buffer[3]); |
2380 | return true; | |
2381 | } | |
2382 | return false; | |
1da177e4 LT |
2383 | case 0x72: |
2384 | case 0x73: | |
2385 | ucp = scsi_sense_desc_find(sense_buffer, sb_len, | |
2386 | 0 /* info desc */); | |
2387 | if (ucp && (0xa == ucp[1])) { | |
2908769c DLM |
2388 | *info_out = get_unaligned_be64(&ucp[4]); |
2389 | return true; | |
2390 | } | |
2391 | return false; | |
1da177e4 | 2392 | default: |
2908769c | 2393 | return false; |
1da177e4 LT |
2394 | } |
2395 | } | |
2396 | EXPORT_SYMBOL(scsi_get_sense_info_fld); |