Commit | Line | Data |
---|---|---|
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 | |
6 | * Leonard Zubkoff and David Miller at Linux Expo, | |
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 | |
13 | * minor cleanups. | |
14 | * September 30, 2002 Mike Anderson (andmike@us.ibm.com) | |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/sched.h> | |
19 | #include <linux/timer.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/kernel.h> | |
c5478def | 23 | #include <linux/kthread.h> |
1da177e4 LT |
24 | #include <linux/interrupt.h> |
25 | #include <linux/blkdev.h> | |
26 | #include <linux/delay.h> | |
27 | ||
28 | #include <scsi/scsi.h> | |
beb40487 | 29 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
30 | #include <scsi/scsi_dbg.h> |
31 | #include <scsi/scsi_device.h> | |
32 | #include <scsi/scsi_eh.h> | |
c829c394 | 33 | #include <scsi/scsi_transport.h> |
1da177e4 LT |
34 | #include <scsi/scsi_host.h> |
35 | #include <scsi/scsi_ioctl.h> | |
1da177e4 LT |
36 | |
37 | #include "scsi_priv.h" | |
38 | #include "scsi_logging.h" | |
39 | ||
40 | #define SENSE_TIMEOUT (10*HZ) | |
41 | #define START_UNIT_TIMEOUT (30*HZ) | |
42 | ||
43 | /* | |
44 | * These should *probably* be handled by the host itself. | |
45 | * Since it is allowed to sleep, it probably should. | |
46 | */ | |
47 | #define BUS_RESET_SETTLE_TIME (10) | |
48 | #define HOST_RESET_SETTLE_TIME (10) | |
49 | ||
50 | /* called with shost->host_lock held */ | |
51 | void scsi_eh_wakeup(struct Scsi_Host *shost) | |
52 | { | |
53 | if (shost->host_busy == shost->host_failed) { | |
3ed7a470 | 54 | wake_up_process(shost->ehandler); |
1da177e4 LT |
55 | SCSI_LOG_ERROR_RECOVERY(5, |
56 | printk("Waking error handler thread\n")); | |
57 | } | |
58 | } | |
f8bbfc24 TH |
59 | |
60 | /** | |
61 | * scsi_schedule_eh - schedule EH for SCSI host | |
62 | * @shost: SCSI host to invoke error handling on. | |
63 | * | |
64 | * Schedule SCSI EH without scmd. | |
65 | **/ | |
66 | void scsi_schedule_eh(struct Scsi_Host *shost) | |
67 | { | |
68 | unsigned long flags; | |
69 | ||
70 | spin_lock_irqsave(shost->host_lock, flags); | |
71 | ||
72 | if (scsi_host_set_state(shost, SHOST_RECOVERY) == 0 || | |
73 | scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY) == 0) { | |
74 | shost->host_eh_scheduled++; | |
75 | scsi_eh_wakeup(shost); | |
76 | } | |
77 | ||
78 | spin_unlock_irqrestore(shost->host_lock, flags); | |
79 | } | |
80 | EXPORT_SYMBOL_GPL(scsi_schedule_eh); | |
1da177e4 LT |
81 | |
82 | /** | |
83 | * scsi_eh_scmd_add - add scsi cmd to error handling. | |
84 | * @scmd: scmd to run eh on. | |
85 | * @eh_flag: optional SCSI_EH flag. | |
86 | * | |
87 | * Return value: | |
88 | * 0 on failure. | |
89 | **/ | |
90 | int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag) | |
91 | { | |
92 | struct Scsi_Host *shost = scmd->device->host; | |
93 | unsigned long flags; | |
939647ee | 94 | int ret = 0; |
1da177e4 | 95 | |
3ed7a470 | 96 | if (!shost->ehandler) |
1da177e4 LT |
97 | return 0; |
98 | ||
99 | spin_lock_irqsave(shost->host_lock, flags); | |
939647ee JB |
100 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) |
101 | if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) | |
102 | goto out_unlock; | |
1da177e4 | 103 | |
939647ee | 104 | ret = 1; |
3111b0d1 | 105 | scmd->eh_eflags |= eh_flag; |
1da177e4 | 106 | list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q); |
1da177e4 LT |
107 | shost->host_failed++; |
108 | scsi_eh_wakeup(shost); | |
939647ee | 109 | out_unlock: |
1da177e4 | 110 | spin_unlock_irqrestore(shost->host_lock, flags); |
939647ee | 111 | return ret; |
1da177e4 LT |
112 | } |
113 | ||
114 | /** | |
115 | * scsi_add_timer - Start timeout timer for a single scsi command. | |
116 | * @scmd: scsi command that is about to start running. | |
117 | * @timeout: amount of time to allow this command to run. | |
118 | * @complete: timeout function to call if timer isn't canceled. | |
119 | * | |
120 | * Notes: | |
121 | * This should be turned into an inline function. Each scsi command | |
122 | * has its own timer, and as it is added to the queue, we set up the | |
123 | * timer. When the command completes, we cancel the timer. | |
124 | **/ | |
125 | void scsi_add_timer(struct scsi_cmnd *scmd, int timeout, | |
126 | void (*complete)(struct scsi_cmnd *)) | |
127 | { | |
128 | ||
129 | /* | |
130 | * If the clock was already running for this command, then | |
131 | * first delete the timer. The timer handling code gets rather | |
132 | * confused if we don't do this. | |
133 | */ | |
134 | if (scmd->eh_timeout.function) | |
135 | del_timer(&scmd->eh_timeout); | |
136 | ||
137 | scmd->eh_timeout.data = (unsigned long)scmd; | |
138 | scmd->eh_timeout.expires = jiffies + timeout; | |
139 | scmd->eh_timeout.function = (void (*)(unsigned long)) complete; | |
140 | ||
141 | SCSI_LOG_ERROR_RECOVERY(5, printk("%s: scmd: %p, time:" | |
142 | " %d, (%p)\n", __FUNCTION__, | |
143 | scmd, timeout, complete)); | |
144 | ||
145 | add_timer(&scmd->eh_timeout); | |
146 | } | |
1da177e4 LT |
147 | |
148 | /** | |
149 | * scsi_delete_timer - Delete/cancel timer for a given function. | |
150 | * @scmd: Cmd that we are canceling timer for | |
151 | * | |
152 | * Notes: | |
153 | * This should be turned into an inline function. | |
154 | * | |
155 | * Return value: | |
156 | * 1 if we were able to detach the timer. 0 if we blew it, and the | |
157 | * timer function has already started to run. | |
158 | **/ | |
159 | int scsi_delete_timer(struct scsi_cmnd *scmd) | |
160 | { | |
161 | int rtn; | |
162 | ||
163 | rtn = del_timer(&scmd->eh_timeout); | |
164 | ||
165 | SCSI_LOG_ERROR_RECOVERY(5, printk("%s: scmd: %p," | |
166 | " rtn: %d\n", __FUNCTION__, | |
167 | scmd, rtn)); | |
168 | ||
169 | scmd->eh_timeout.data = (unsigned long)NULL; | |
170 | scmd->eh_timeout.function = NULL; | |
171 | ||
172 | return rtn; | |
173 | } | |
1da177e4 LT |
174 | |
175 | /** | |
176 | * scsi_times_out - Timeout function for normal scsi commands. | |
177 | * @scmd: Cmd that is timing out. | |
178 | * | |
179 | * Notes: | |
180 | * We do not need to lock this. There is the potential for a race | |
181 | * only in that the normal completion handling might run, but if the | |
182 | * normal completion function determines that the timer has already | |
183 | * fired, then it mustn't do anything. | |
184 | **/ | |
185 | void scsi_times_out(struct scsi_cmnd *scmd) | |
186 | { | |
187 | scsi_log_completion(scmd, TIMEOUT_ERROR); | |
188 | ||
c829c394 JS |
189 | if (scmd->device->host->transportt->eh_timed_out) |
190 | switch (scmd->device->host->transportt->eh_timed_out(scmd)) { | |
1da177e4 LT |
191 | case EH_HANDLED: |
192 | __scsi_done(scmd); | |
193 | return; | |
194 | case EH_RESET_TIMER: | |
1da177e4 LT |
195 | scsi_add_timer(scmd, scmd->timeout_per_command, |
196 | scsi_times_out); | |
197 | return; | |
198 | case EH_NOT_HANDLED: | |
199 | break; | |
200 | } | |
201 | ||
202 | if (unlikely(!scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD))) { | |
939647ee JB |
203 | scmd->result |= DID_TIME_OUT << 16; |
204 | __scsi_done(scmd); | |
1da177e4 LT |
205 | } |
206 | } | |
207 | ||
208 | /** | |
209 | * scsi_block_when_processing_errors - Prevent cmds from being queued. | |
210 | * @sdev: Device on which we are performing recovery. | |
211 | * | |
212 | * Description: | |
213 | * We block until the host is out of error recovery, and then check to | |
214 | * see whether the host or the device is offline. | |
215 | * | |
216 | * Return value: | |
217 | * 0 when dev was taken offline by error recovery. 1 OK to proceed. | |
218 | **/ | |
219 | int scsi_block_when_processing_errors(struct scsi_device *sdev) | |
220 | { | |
221 | int online; | |
222 | ||
939647ee | 223 | wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host)); |
1da177e4 LT |
224 | |
225 | online = scsi_device_online(sdev); | |
226 | ||
227 | SCSI_LOG_ERROR_RECOVERY(5, printk("%s: rtn: %d\n", __FUNCTION__, | |
228 | online)); | |
229 | ||
230 | return online; | |
231 | } | |
232 | EXPORT_SYMBOL(scsi_block_when_processing_errors); | |
233 | ||
234 | #ifdef CONFIG_SCSI_LOGGING | |
235 | /** | |
236 | * scsi_eh_prt_fail_stats - Log info on failures. | |
237 | * @shost: scsi host being recovered. | |
238 | * @work_q: Queue of scsi cmds to process. | |
239 | **/ | |
240 | static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost, | |
241 | struct list_head *work_q) | |
242 | { | |
243 | struct scsi_cmnd *scmd; | |
244 | struct scsi_device *sdev; | |
245 | int total_failures = 0; | |
246 | int cmd_failed = 0; | |
247 | int cmd_cancel = 0; | |
248 | int devices_failed = 0; | |
249 | ||
250 | shost_for_each_device(sdev, shost) { | |
251 | list_for_each_entry(scmd, work_q, eh_entry) { | |
252 | if (scmd->device == sdev) { | |
253 | ++total_failures; | |
3111b0d1 | 254 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) |
1da177e4 LT |
255 | ++cmd_cancel; |
256 | else | |
257 | ++cmd_failed; | |
258 | } | |
259 | } | |
260 | ||
261 | if (cmd_cancel || cmd_failed) { | |
262 | SCSI_LOG_ERROR_RECOVERY(3, | |
9ccfc756 JB |
263 | sdev_printk(KERN_INFO, sdev, |
264 | "%s: cmds failed: %d, cancel: %d\n", | |
265 | __FUNCTION__, cmd_failed, | |
266 | cmd_cancel)); | |
1da177e4 LT |
267 | cmd_cancel = 0; |
268 | cmd_failed = 0; | |
269 | ++devices_failed; | |
270 | } | |
271 | } | |
272 | ||
273 | SCSI_LOG_ERROR_RECOVERY(2, printk("Total of %d commands on %d" | |
274 | " devices require eh work\n", | |
275 | total_failures, devices_failed)); | |
276 | } | |
277 | #endif | |
278 | ||
279 | /** | |
280 | * scsi_check_sense - Examine scsi cmd sense | |
281 | * @scmd: Cmd to have sense checked. | |
282 | * | |
283 | * Return value: | |
284 | * SUCCESS or FAILED or NEEDS_RETRY | |
285 | * | |
286 | * Notes: | |
287 | * When a deferred error is detected the current command has | |
288 | * not been executed and needs retrying. | |
289 | **/ | |
290 | static int scsi_check_sense(struct scsi_cmnd *scmd) | |
291 | { | |
292 | struct scsi_sense_hdr sshdr; | |
293 | ||
294 | if (! scsi_command_normalize_sense(scmd, &sshdr)) | |
295 | return FAILED; /* no valid sense data */ | |
296 | ||
297 | if (scsi_sense_is_deferred(&sshdr)) | |
298 | return NEEDS_RETRY; | |
299 | ||
300 | /* | |
301 | * Previous logic looked for FILEMARK, EOM or ILI which are | |
302 | * mainly associated with tapes and returned SUCCESS. | |
303 | */ | |
304 | if (sshdr.response_code == 0x70) { | |
305 | /* fixed format */ | |
306 | if (scmd->sense_buffer[2] & 0xe0) | |
307 | return SUCCESS; | |
308 | } else { | |
309 | /* | |
310 | * descriptor format: look for "stream commands sense data | |
311 | * descriptor" (see SSC-3). Assume single sense data | |
312 | * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG. | |
313 | */ | |
314 | if ((sshdr.additional_length > 3) && | |
315 | (scmd->sense_buffer[8] == 0x4) && | |
316 | (scmd->sense_buffer[11] & 0xe0)) | |
317 | return SUCCESS; | |
318 | } | |
319 | ||
320 | switch (sshdr.sense_key) { | |
321 | case NO_SENSE: | |
322 | return SUCCESS; | |
323 | case RECOVERED_ERROR: | |
324 | return /* soft_error */ SUCCESS; | |
325 | ||
326 | case ABORTED_COMMAND: | |
327 | return NEEDS_RETRY; | |
328 | case NOT_READY: | |
329 | case UNIT_ATTENTION: | |
330 | /* | |
331 | * if we are expecting a cc/ua because of a bus reset that we | |
332 | * performed, treat this just as a retry. otherwise this is | |
333 | * information that we should pass up to the upper-level driver | |
334 | * so that we can deal with it there. | |
335 | */ | |
336 | if (scmd->device->expecting_cc_ua) { | |
337 | scmd->device->expecting_cc_ua = 0; | |
338 | return NEEDS_RETRY; | |
339 | } | |
340 | /* | |
341 | * if the device is in the process of becoming ready, we | |
342 | * should retry. | |
343 | */ | |
344 | if ((sshdr.asc == 0x04) && (sshdr.ascq == 0x01)) | |
345 | return NEEDS_RETRY; | |
346 | /* | |
347 | * if the device is not started, we need to wake | |
348 | * the error handler to start the motor | |
349 | */ | |
350 | if (scmd->device->allow_restart && | |
351 | (sshdr.asc == 0x04) && (sshdr.ascq == 0x02)) | |
352 | return FAILED; | |
353 | return SUCCESS; | |
354 | ||
355 | /* these three are not supported */ | |
356 | case COPY_ABORTED: | |
357 | case VOLUME_OVERFLOW: | |
358 | case MISCOMPARE: | |
359 | return SUCCESS; | |
360 | ||
361 | case MEDIUM_ERROR: | |
fd1b494d LT |
362 | if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */ |
363 | sshdr.asc == 0x13 || /* AMNF DATA FIELD */ | |
364 | sshdr.asc == 0x14) { /* RECORD NOT FOUND */ | |
365 | return SUCCESS; | |
366 | } | |
1da177e4 LT |
367 | return NEEDS_RETRY; |
368 | ||
369 | case HARDWARE_ERROR: | |
370 | if (scmd->device->retry_hwerror) | |
371 | return NEEDS_RETRY; | |
372 | else | |
373 | return SUCCESS; | |
374 | ||
375 | case ILLEGAL_REQUEST: | |
376 | case BLANK_CHECK: | |
377 | case DATA_PROTECT: | |
378 | default: | |
379 | return SUCCESS; | |
380 | } | |
381 | } | |
382 | ||
383 | /** | |
384 | * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD. | |
385 | * @scmd: SCSI cmd to examine. | |
386 | * | |
387 | * Notes: | |
388 | * This is *only* called when we are examining the status of commands | |
389 | * queued during error recovery. the main difference here is that we | |
390 | * don't allow for the possibility of retries here, and we are a lot | |
391 | * more restrictive about what we consider acceptable. | |
392 | **/ | |
393 | static int scsi_eh_completed_normally(struct scsi_cmnd *scmd) | |
394 | { | |
395 | /* | |
396 | * first check the host byte, to see if there is anything in there | |
397 | * that would indicate what we need to do. | |
398 | */ | |
399 | if (host_byte(scmd->result) == DID_RESET) { | |
400 | /* | |
401 | * rats. we are already in the error handler, so we now | |
402 | * get to try and figure out what to do next. if the sense | |
403 | * is valid, we have a pretty good idea of what to do. | |
404 | * if not, we mark it as FAILED. | |
405 | */ | |
406 | return scsi_check_sense(scmd); | |
407 | } | |
408 | if (host_byte(scmd->result) != DID_OK) | |
409 | return FAILED; | |
410 | ||
411 | /* | |
412 | * next, check the message byte. | |
413 | */ | |
414 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
415 | return FAILED; | |
416 | ||
417 | /* | |
418 | * now, check the status byte to see if this indicates | |
419 | * anything special. | |
420 | */ | |
421 | switch (status_byte(scmd->result)) { | |
422 | case GOOD: | |
423 | case COMMAND_TERMINATED: | |
424 | return SUCCESS; | |
425 | case CHECK_CONDITION: | |
426 | return scsi_check_sense(scmd); | |
427 | case CONDITION_GOOD: | |
428 | case INTERMEDIATE_GOOD: | |
429 | case INTERMEDIATE_C_GOOD: | |
430 | /* | |
431 | * who knows? FIXME(eric) | |
432 | */ | |
433 | return SUCCESS; | |
434 | case BUSY: | |
435 | case QUEUE_FULL: | |
436 | case RESERVATION_CONFLICT: | |
437 | default: | |
438 | return FAILED; | |
439 | } | |
440 | return FAILED; | |
441 | } | |
442 | ||
1da177e4 LT |
443 | /** |
444 | * scsi_eh_done - Completion function for error handling. | |
445 | * @scmd: Cmd that is done. | |
446 | **/ | |
447 | static void scsi_eh_done(struct scsi_cmnd *scmd) | |
448 | { | |
85631672 MR |
449 | struct completion *eh_action; |
450 | ||
7dfdc9a5 CH |
451 | SCSI_LOG_ERROR_RECOVERY(3, |
452 | printk("%s scmd: %p result: %x\n", | |
453 | __FUNCTION__, scmd, scmd->result)); | |
85631672 MR |
454 | |
455 | eh_action = scmd->device->host->eh_action; | |
456 | if (eh_action) | |
457 | complete(eh_action); | |
1da177e4 LT |
458 | } |
459 | ||
292148f8 BK |
460 | /** |
461 | * scsi_try_host_reset - ask host adapter to reset itself | |
462 | * @scmd: SCSI cmd to send hsot reset. | |
463 | **/ | |
464 | static int scsi_try_host_reset(struct scsi_cmnd *scmd) | |
465 | { | |
466 | unsigned long flags; | |
467 | int rtn; | |
468 | ||
469 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Host RST\n", | |
470 | __FUNCTION__)); | |
471 | ||
472 | if (!scmd->device->host->hostt->eh_host_reset_handler) | |
473 | return FAILED; | |
474 | ||
475 | rtn = scmd->device->host->hostt->eh_host_reset_handler(scmd); | |
476 | ||
477 | if (rtn == SUCCESS) { | |
478 | if (!scmd->device->host->hostt->skip_settle_delay) | |
479 | ssleep(HOST_RESET_SETTLE_TIME); | |
480 | spin_lock_irqsave(scmd->device->host->host_lock, flags); | |
481 | scsi_report_bus_reset(scmd->device->host, | |
482 | scmd_channel(scmd)); | |
483 | spin_unlock_irqrestore(scmd->device->host->host_lock, flags); | |
484 | } | |
485 | ||
486 | return rtn; | |
487 | } | |
488 | ||
489 | /** | |
490 | * scsi_try_bus_reset - ask host to perform a bus reset | |
491 | * @scmd: SCSI cmd to send bus reset. | |
492 | **/ | |
493 | static int scsi_try_bus_reset(struct scsi_cmnd *scmd) | |
494 | { | |
495 | unsigned long flags; | |
496 | int rtn; | |
497 | ||
498 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Bus RST\n", | |
499 | __FUNCTION__)); | |
500 | ||
501 | if (!scmd->device->host->hostt->eh_bus_reset_handler) | |
502 | return FAILED; | |
503 | ||
504 | rtn = scmd->device->host->hostt->eh_bus_reset_handler(scmd); | |
505 | ||
506 | if (rtn == SUCCESS) { | |
507 | if (!scmd->device->host->hostt->skip_settle_delay) | |
508 | ssleep(BUS_RESET_SETTLE_TIME); | |
509 | spin_lock_irqsave(scmd->device->host->host_lock, flags); | |
510 | scsi_report_bus_reset(scmd->device->host, | |
511 | scmd_channel(scmd)); | |
512 | spin_unlock_irqrestore(scmd->device->host->host_lock, flags); | |
513 | } | |
514 | ||
515 | return rtn; | |
516 | } | |
517 | ||
518 | /** | |
519 | * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev | |
520 | * @scmd: SCSI cmd used to send BDR | |
521 | * | |
522 | * Notes: | |
523 | * There is no timeout for this operation. if this operation is | |
524 | * unreliable for a given host, then the host itself needs to put a | |
525 | * timer on it, and set the host back to a consistent state prior to | |
526 | * returning. | |
527 | **/ | |
528 | static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd) | |
529 | { | |
530 | int rtn; | |
531 | ||
532 | if (!scmd->device->host->hostt->eh_device_reset_handler) | |
533 | return FAILED; | |
534 | ||
535 | rtn = scmd->device->host->hostt->eh_device_reset_handler(scmd); | |
536 | if (rtn == SUCCESS) { | |
537 | scmd->device->was_reset = 1; | |
538 | scmd->device->expecting_cc_ua = 1; | |
539 | } | |
540 | ||
541 | return rtn; | |
542 | } | |
543 | ||
544 | static int __scsi_try_to_abort_cmd(struct scsi_cmnd *scmd) | |
545 | { | |
546 | if (!scmd->device->host->hostt->eh_abort_handler) | |
547 | return FAILED; | |
548 | ||
549 | return scmd->device->host->hostt->eh_abort_handler(scmd); | |
550 | } | |
551 | ||
552 | /** | |
553 | * scsi_try_to_abort_cmd - Ask host to abort a running command. | |
554 | * @scmd: SCSI cmd to abort from Lower Level. | |
555 | * | |
556 | * Notes: | |
557 | * This function will not return until the user's completion function | |
558 | * has been called. there is no timeout on this operation. if the | |
559 | * author of the low-level driver wishes this operation to be timed, | |
560 | * they can provide this facility themselves. helper functions in | |
561 | * scsi_error.c can be supplied to make this easier to do. | |
562 | **/ | |
563 | static int scsi_try_to_abort_cmd(struct scsi_cmnd *scmd) | |
564 | { | |
565 | /* | |
566 | * scsi_done was called just after the command timed out and before | |
567 | * we had a chance to process it. (db) | |
568 | */ | |
569 | if (scmd->serial_number == 0) | |
570 | return SUCCESS; | |
571 | return __scsi_try_to_abort_cmd(scmd); | |
572 | } | |
573 | ||
574 | static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd) | |
575 | { | |
576 | if (__scsi_try_to_abort_cmd(scmd) != SUCCESS) | |
577 | if (scsi_try_bus_device_reset(scmd) != SUCCESS) | |
578 | if (scsi_try_bus_reset(scmd) != SUCCESS) | |
579 | scsi_try_host_reset(scmd); | |
580 | } | |
581 | ||
1da177e4 | 582 | /** |
2dc611de CH |
583 | * scsi_send_eh_cmnd - submit a scsi command as part of error recory |
584 | * @scmd: SCSI command structure to hijack | |
585 | * @cmnd: CDB to send | |
586 | * @cmnd_size: size in bytes of @cmnd | |
587 | * @timeout: timeout for this request | |
588 | * @copy_sense: request sense data if set to 1 | |
589 | * | |
590 | * This function is used to send a scsi command down to a target device | |
591 | * as part of the error recovery process. If @copy_sense is 0 the command | |
592 | * sent must be one that does not transfer any data. If @copy_sense is 1 | |
593 | * the command must be REQUEST_SENSE and this functions copies out the | |
594 | * sense buffer it got into @scmd->sense_buffer. | |
1da177e4 | 595 | * |
1da177e4 LT |
596 | * Return value: |
597 | * SUCCESS or FAILED or NEEDS_RETRY | |
598 | **/ | |
0db99e33 MC |
599 | static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd, |
600 | int cmnd_size, int timeout, int copy_sense) | |
1da177e4 | 601 | { |
f59114b7 | 602 | struct scsi_device *sdev = scmd->device; |
603 | struct Scsi_Host *shost = sdev->host; | |
631c228c | 604 | int old_result = scmd->result; |
7fbb3645 | 605 | DECLARE_COMPLETION_ONSTACK(done); |
7dfdc9a5 | 606 | unsigned long timeleft; |
1da177e4 | 607 | unsigned long flags; |
2dc611de | 608 | struct scatterlist sgl; |
631c228c CH |
609 | unsigned char old_cmnd[MAX_COMMAND_SIZE]; |
610 | enum dma_data_direction old_data_direction; | |
611 | unsigned short old_use_sg; | |
612 | unsigned char old_cmd_len; | |
613 | unsigned old_bufflen; | |
614 | void *old_buffer; | |
7dfdc9a5 | 615 | int rtn; |
1da177e4 | 616 | |
631c228c CH |
617 | /* |
618 | * We need saved copies of a number of fields - this is because | |
619 | * error handling may need to overwrite these with different values | |
620 | * to run different commands, and once error handling is complete, | |
621 | * we will need to restore these values prior to running the actual | |
622 | * command. | |
623 | */ | |
624 | old_buffer = scmd->request_buffer; | |
625 | old_bufflen = scmd->request_bufflen; | |
626 | memcpy(old_cmnd, scmd->cmnd, sizeof(scmd->cmnd)); | |
627 | old_data_direction = scmd->sc_data_direction; | |
628 | old_cmd_len = scmd->cmd_len; | |
629 | old_use_sg = scmd->use_sg; | |
630 | ||
0db99e33 MC |
631 | memset(scmd->cmnd, 0, sizeof(scmd->cmnd)); |
632 | memcpy(scmd->cmnd, cmnd, cmnd_size); | |
633 | ||
631c228c | 634 | if (copy_sense) { |
fa1f5ea8 | 635 | gfp_t gfp_mask = GFP_ATOMIC; |
631c228c CH |
636 | |
637 | if (shost->hostt->unchecked_isa_dma) | |
638 | gfp_mask |= __GFP_DMA; | |
639 | ||
2dc611de CH |
640 | sgl.page = alloc_page(gfp_mask); |
641 | if (!sgl.page) | |
631c228c | 642 | return FAILED; |
2dc611de CH |
643 | sgl.offset = 0; |
644 | sgl.length = 252; | |
645 | ||
646 | scmd->sc_data_direction = DMA_FROM_DEVICE; | |
647 | scmd->request_bufflen = sgl.length; | |
648 | scmd->request_buffer = &sgl; | |
649 | scmd->use_sg = 1; | |
631c228c CH |
650 | } else { |
651 | scmd->request_buffer = NULL; | |
652 | scmd->request_bufflen = 0; | |
653 | scmd->sc_data_direction = DMA_NONE; | |
2dc611de | 654 | scmd->use_sg = 0; |
631c228c CH |
655 | } |
656 | ||
657 | scmd->underflow = 0; | |
631c228c CH |
658 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); |
659 | ||
f59114b7 | 660 | if (sdev->scsi_level <= SCSI_2) |
1da177e4 | 661 | scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) | |
f59114b7 | 662 | (sdev->lun << 5 & 0xe0); |
1da177e4 | 663 | |
631c228c CH |
664 | /* |
665 | * Zero the sense buffer. The scsi spec mandates that any | |
666 | * untransferred sense data should be interpreted as being zero. | |
667 | */ | |
668 | memset(scmd->sense_buffer, 0, sizeof(scmd->sense_buffer)); | |
669 | ||
7dfdc9a5 | 670 | shost->eh_action = &done; |
1da177e4 | 671 | |
f59114b7 | 672 | spin_lock_irqsave(shost->host_lock, flags); |
1da177e4 | 673 | scsi_log_send(scmd); |
f59114b7 | 674 | shost->hostt->queuecommand(scmd, scsi_eh_done); |
675 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 | 676 | |
7dfdc9a5 | 677 | timeleft = wait_for_completion_timeout(&done, timeout); |
1da177e4 | 678 | |
f59114b7 | 679 | shost->eh_action = NULL; |
1da177e4 | 680 | |
7dfdc9a5 | 681 | scsi_log_completion(scmd, SUCCESS); |
1da177e4 | 682 | |
7dfdc9a5 CH |
683 | SCSI_LOG_ERROR_RECOVERY(3, |
684 | printk("%s: scmd: %p, timeleft: %ld\n", | |
685 | __FUNCTION__, scmd, timeleft)); | |
1da177e4 LT |
686 | |
687 | /* | |
7dfdc9a5 CH |
688 | * If there is time left scsi_eh_done got called, and we will |
689 | * examine the actual status codes to see whether the command | |
690 | * actually did complete normally, else tell the host to forget | |
691 | * about this command. | |
1da177e4 | 692 | */ |
7dfdc9a5 | 693 | if (timeleft) { |
1da177e4 LT |
694 | rtn = scsi_eh_completed_normally(scmd); |
695 | SCSI_LOG_ERROR_RECOVERY(3, | |
696 | printk("%s: scsi_eh_completed_normally %x\n", | |
697 | __FUNCTION__, rtn)); | |
7dfdc9a5 | 698 | |
1da177e4 LT |
699 | switch (rtn) { |
700 | case SUCCESS: | |
701 | case NEEDS_RETRY: | |
702 | case FAILED: | |
703 | break; | |
704 | default: | |
705 | rtn = FAILED; | |
706 | break; | |
707 | } | |
7dfdc9a5 | 708 | } else { |
292148f8 | 709 | scsi_abort_eh_cmnd(scmd); |
7dfdc9a5 | 710 | rtn = FAILED; |
1da177e4 LT |
711 | } |
712 | ||
631c228c CH |
713 | |
714 | /* | |
715 | * Last chance to have valid sense data. | |
716 | */ | |
717 | if (copy_sense) { | |
718 | if (!SCSI_SENSE_VALID(scmd)) { | |
719 | memcpy(scmd->sense_buffer, scmd->request_buffer, | |
720 | sizeof(scmd->sense_buffer)); | |
721 | } | |
2dc611de | 722 | __free_page(sgl.page); |
631c228c CH |
723 | } |
724 | ||
725 | ||
726 | /* | |
727 | * Restore original data | |
728 | */ | |
729 | scmd->request_buffer = old_buffer; | |
730 | scmd->request_bufflen = old_bufflen; | |
731 | memcpy(scmd->cmnd, old_cmnd, sizeof(scmd->cmnd)); | |
732 | scmd->sc_data_direction = old_data_direction; | |
733 | scmd->cmd_len = old_cmd_len; | |
734 | scmd->use_sg = old_use_sg; | |
735 | scmd->result = old_result; | |
1da177e4 LT |
736 | return rtn; |
737 | } | |
738 | ||
739 | /** | |
740 | * scsi_request_sense - Request sense data from a particular target. | |
741 | * @scmd: SCSI cmd for request sense. | |
742 | * | |
743 | * Notes: | |
744 | * Some hosts automatically obtain this information, others require | |
745 | * that we obtain it on our own. This function will *not* return until | |
746 | * the command either times out, or it completes. | |
747 | **/ | |
748 | static int scsi_request_sense(struct scsi_cmnd *scmd) | |
749 | { | |
750 | static unsigned char generic_sense[6] = | |
631c228c | 751 | {REQUEST_SENSE, 0, 0, 0, 252, 0}; |
1da177e4 | 752 | |
0db99e33 | 753 | return scsi_send_eh_cmnd(scmd, generic_sense, 6, SENSE_TIMEOUT, 1); |
1da177e4 LT |
754 | } |
755 | ||
756 | /** | |
757 | * scsi_eh_finish_cmd - Handle a cmd that eh is finished with. | |
758 | * @scmd: Original SCSI cmd that eh has finished. | |
759 | * @done_q: Queue for processed commands. | |
760 | * | |
761 | * Notes: | |
762 | * We don't want to use the normal command completion while we are are | |
763 | * still handling errors - it may cause other commands to be queued, | |
764 | * and that would disturb what we are doing. thus we really want to | |
765 | * keep a list of pending commands for final completion, and once we | |
766 | * are ready to leave error handling we handle completion for real. | |
767 | **/ | |
041c5fc3 | 768 | void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q) |
1da177e4 LT |
769 | { |
770 | scmd->device->host->host_failed--; | |
3111b0d1 | 771 | scmd->eh_eflags = 0; |
1da177e4 LT |
772 | list_move_tail(&scmd->eh_entry, done_q); |
773 | } | |
041c5fc3 | 774 | EXPORT_SYMBOL(scsi_eh_finish_cmd); |
1da177e4 LT |
775 | |
776 | /** | |
777 | * scsi_eh_get_sense - Get device sense data. | |
778 | * @work_q: Queue of commands to process. | |
779 | * @done_q: Queue of proccessed commands.. | |
780 | * | |
781 | * Description: | |
782 | * See if we need to request sense information. if so, then get it | |
783 | * now, so we have a better idea of what to do. | |
784 | * | |
785 | * Notes: | |
786 | * This has the unfortunate side effect that if a shost adapter does | |
787 | * not automatically request sense information, that we end up shutting | |
788 | * it down before we request it. | |
789 | * | |
790 | * All drivers should request sense information internally these days, | |
791 | * so for now all I have to say is tough noogies if you end up in here. | |
792 | * | |
793 | * XXX: Long term this code should go away, but that needs an audit of | |
794 | * all LLDDs first. | |
795 | **/ | |
dca84e46 DW |
796 | int scsi_eh_get_sense(struct list_head *work_q, |
797 | struct list_head *done_q) | |
1da177e4 | 798 | { |
937abeaa | 799 | struct scsi_cmnd *scmd, *next; |
1da177e4 LT |
800 | int rtn; |
801 | ||
937abeaa | 802 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 803 | if ((scmd->eh_eflags & SCSI_EH_CANCEL_CMD) || |
1da177e4 LT |
804 | SCSI_SENSE_VALID(scmd)) |
805 | continue; | |
806 | ||
3bf743e7 JG |
807 | SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd, |
808 | "%s: requesting sense\n", | |
809 | current->comm)); | |
1da177e4 LT |
810 | rtn = scsi_request_sense(scmd); |
811 | if (rtn != SUCCESS) | |
812 | continue; | |
813 | ||
814 | SCSI_LOG_ERROR_RECOVERY(3, printk("sense requested for %p" | |
815 | " result %x\n", scmd, | |
816 | scmd->result)); | |
817 | SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense("bh", scmd)); | |
818 | ||
819 | rtn = scsi_decide_disposition(scmd); | |
820 | ||
821 | /* | |
822 | * if the result was normal, then just pass it along to the | |
823 | * upper level. | |
824 | */ | |
825 | if (rtn == SUCCESS) | |
826 | /* we don't want this command reissued, just | |
827 | * finished with the sense data, so set | |
828 | * retries to the max allowed to ensure it | |
829 | * won't get reissued */ | |
830 | scmd->retries = scmd->allowed; | |
831 | else if (rtn != NEEDS_RETRY) | |
832 | continue; | |
833 | ||
834 | scsi_eh_finish_cmd(scmd, done_q); | |
835 | } | |
836 | ||
837 | return list_empty(work_q); | |
838 | } | |
dca84e46 | 839 | EXPORT_SYMBOL_GPL(scsi_eh_get_sense); |
1da177e4 | 840 | |
1da177e4 LT |
841 | /** |
842 | * scsi_eh_tur - Send TUR to device. | |
843 | * @scmd: Scsi cmd to send TUR | |
844 | * | |
845 | * Return value: | |
846 | * 0 - Device is ready. 1 - Device NOT ready. | |
847 | **/ | |
848 | static int scsi_eh_tur(struct scsi_cmnd *scmd) | |
849 | { | |
850 | static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0}; | |
851 | int retry_cnt = 1, rtn; | |
852 | ||
853 | retry_tur: | |
0db99e33 | 854 | rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, SENSE_TIMEOUT, 0); |
1da177e4 | 855 | |
1da177e4 LT |
856 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd %p rtn %x\n", |
857 | __FUNCTION__, scmd, rtn)); | |
631c228c CH |
858 | |
859 | switch (rtn) { | |
860 | case NEEDS_RETRY: | |
1da177e4 LT |
861 | if (retry_cnt--) |
862 | goto retry_tur; | |
631c228c CH |
863 | /*FALLTHRU*/ |
864 | case SUCCESS: | |
e47373ec | 865 | return 0; |
631c228c CH |
866 | default: |
867 | return 1; | |
e47373ec | 868 | } |
1da177e4 LT |
869 | } |
870 | ||
871 | /** | |
872 | * scsi_eh_abort_cmds - abort canceled commands. | |
873 | * @shost: scsi host being recovered. | |
874 | * @eh_done_q: list_head for processed commands. | |
875 | * | |
876 | * Decription: | |
877 | * Try and see whether or not it makes sense to try and abort the | |
878 | * running command. this only works out to be the case if we have one | |
879 | * command that has timed out. if the command simply failed, it makes | |
880 | * no sense to try and abort the command, since as far as the shost | |
881 | * adapter is concerned, it isn't running. | |
882 | **/ | |
883 | static int scsi_eh_abort_cmds(struct list_head *work_q, | |
884 | struct list_head *done_q) | |
885 | { | |
937abeaa | 886 | struct scsi_cmnd *scmd, *next; |
1da177e4 LT |
887 | int rtn; |
888 | ||
937abeaa | 889 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 890 | if (!(scmd->eh_eflags & SCSI_EH_CANCEL_CMD)) |
1da177e4 LT |
891 | continue; |
892 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting cmd:" | |
893 | "0x%p\n", current->comm, | |
894 | scmd)); | |
895 | rtn = scsi_try_to_abort_cmd(scmd); | |
896 | if (rtn == SUCCESS) { | |
3111b0d1 | 897 | scmd->eh_eflags &= ~SCSI_EH_CANCEL_CMD; |
1da177e4 LT |
898 | if (!scsi_device_online(scmd->device) || |
899 | !scsi_eh_tur(scmd)) { | |
900 | scsi_eh_finish_cmd(scmd, done_q); | |
901 | } | |
902 | ||
903 | } else | |
904 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting" | |
905 | " cmd failed:" | |
906 | "0x%p\n", | |
907 | current->comm, | |
908 | scmd)); | |
909 | } | |
910 | ||
911 | return list_empty(work_q); | |
912 | } | |
913 | ||
1da177e4 LT |
914 | /** |
915 | * scsi_eh_try_stu - Send START_UNIT to device. | |
916 | * @scmd: Scsi cmd to send START_UNIT | |
917 | * | |
918 | * Return value: | |
919 | * 0 - Device is ready. 1 - Device NOT ready. | |
920 | **/ | |
921 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd) | |
922 | { | |
923 | static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0}; | |
1da177e4 | 924 | |
631c228c CH |
925 | if (scmd->device->allow_restart) { |
926 | int rtn; | |
1da177e4 | 927 | |
0db99e33 MC |
928 | rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, |
929 | START_UNIT_TIMEOUT, 0); | |
631c228c CH |
930 | if (rtn == SUCCESS) |
931 | return 0; | |
932 | } | |
1da177e4 | 933 | |
1da177e4 LT |
934 | return 1; |
935 | } | |
936 | ||
937 | /** | |
938 | * scsi_eh_stu - send START_UNIT if needed | |
939 | * @shost: scsi host being recovered. | |
940 | * @eh_done_q: list_head for processed commands. | |
941 | * | |
942 | * Notes: | |
943 | * If commands are failing due to not ready, initializing command required, | |
944 | * try revalidating the device, which will end up sending a start unit. | |
945 | **/ | |
946 | static int scsi_eh_stu(struct Scsi_Host *shost, | |
947 | struct list_head *work_q, | |
948 | struct list_head *done_q) | |
949 | { | |
937abeaa | 950 | struct scsi_cmnd *scmd, *stu_scmd, *next; |
1da177e4 LT |
951 | struct scsi_device *sdev; |
952 | ||
953 | shost_for_each_device(sdev, shost) { | |
954 | stu_scmd = NULL; | |
955 | list_for_each_entry(scmd, work_q, eh_entry) | |
956 | if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) && | |
957 | scsi_check_sense(scmd) == FAILED ) { | |
958 | stu_scmd = scmd; | |
959 | break; | |
960 | } | |
961 | ||
962 | if (!stu_scmd) | |
963 | continue; | |
964 | ||
965 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending START_UNIT to sdev:" | |
966 | " 0x%p\n", current->comm, sdev)); | |
967 | ||
968 | if (!scsi_eh_try_stu(stu_scmd)) { | |
969 | if (!scsi_device_online(sdev) || | |
970 | !scsi_eh_tur(stu_scmd)) { | |
937abeaa CH |
971 | list_for_each_entry_safe(scmd, next, |
972 | work_q, eh_entry) { | |
1da177e4 LT |
973 | if (scmd->device == sdev) |
974 | scsi_eh_finish_cmd(scmd, done_q); | |
975 | } | |
976 | } | |
977 | } else { | |
978 | SCSI_LOG_ERROR_RECOVERY(3, | |
979 | printk("%s: START_UNIT failed to sdev:" | |
980 | " 0x%p\n", current->comm, sdev)); | |
981 | } | |
982 | } | |
983 | ||
984 | return list_empty(work_q); | |
985 | } | |
986 | ||
987 | ||
988 | /** | |
989 | * scsi_eh_bus_device_reset - send bdr if needed | |
990 | * @shost: scsi host being recovered. | |
991 | * @eh_done_q: list_head for processed commands. | |
992 | * | |
993 | * Notes: | |
994 | * Try a bus device reset. still, look to see whether we have multiple | |
995 | * devices that are jammed or not - if we have multiple devices, it | |
996 | * makes no sense to try bus_device_reset - we really would need to try | |
997 | * a bus_reset instead. | |
998 | **/ | |
999 | static int scsi_eh_bus_device_reset(struct Scsi_Host *shost, | |
1000 | struct list_head *work_q, | |
1001 | struct list_head *done_q) | |
1002 | { | |
937abeaa | 1003 | struct scsi_cmnd *scmd, *bdr_scmd, *next; |
1da177e4 LT |
1004 | struct scsi_device *sdev; |
1005 | int rtn; | |
1006 | ||
1007 | shost_for_each_device(sdev, shost) { | |
1008 | bdr_scmd = NULL; | |
1009 | list_for_each_entry(scmd, work_q, eh_entry) | |
1010 | if (scmd->device == sdev) { | |
1011 | bdr_scmd = scmd; | |
1012 | break; | |
1013 | } | |
1014 | ||
1015 | if (!bdr_scmd) | |
1016 | continue; | |
1017 | ||
1018 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BDR sdev:" | |
1019 | " 0x%p\n", current->comm, | |
1020 | sdev)); | |
1021 | rtn = scsi_try_bus_device_reset(bdr_scmd); | |
1022 | if (rtn == SUCCESS) { | |
1023 | if (!scsi_device_online(sdev) || | |
1024 | !scsi_eh_tur(bdr_scmd)) { | |
937abeaa CH |
1025 | list_for_each_entry_safe(scmd, next, |
1026 | work_q, eh_entry) { | |
1da177e4 LT |
1027 | if (scmd->device == sdev) |
1028 | scsi_eh_finish_cmd(scmd, | |
1029 | done_q); | |
1030 | } | |
1031 | } | |
1032 | } else { | |
1033 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BDR" | |
1034 | " failed sdev:" | |
1035 | "0x%p\n", | |
1036 | current->comm, | |
1037 | sdev)); | |
1038 | } | |
1039 | } | |
1040 | ||
1041 | return list_empty(work_q); | |
1042 | } | |
1043 | ||
1da177e4 LT |
1044 | /** |
1045 | * scsi_eh_bus_reset - send a bus reset | |
1046 | * @shost: scsi host being recovered. | |
1047 | * @eh_done_q: list_head for processed commands. | |
1048 | **/ | |
1049 | static int scsi_eh_bus_reset(struct Scsi_Host *shost, | |
1050 | struct list_head *work_q, | |
1051 | struct list_head *done_q) | |
1052 | { | |
937abeaa | 1053 | struct scsi_cmnd *scmd, *chan_scmd, *next; |
1da177e4 LT |
1054 | unsigned int channel; |
1055 | int rtn; | |
1056 | ||
1057 | /* | |
1058 | * we really want to loop over the various channels, and do this on | |
1059 | * a channel by channel basis. we should also check to see if any | |
1060 | * of the failed commands are on soft_reset devices, and if so, skip | |
1061 | * the reset. | |
1062 | */ | |
1063 | ||
1064 | for (channel = 0; channel <= shost->max_channel; channel++) { | |
1065 | chan_scmd = NULL; | |
1066 | list_for_each_entry(scmd, work_q, eh_entry) { | |
422c0d61 | 1067 | if (channel == scmd_channel(scmd)) { |
1da177e4 LT |
1068 | chan_scmd = scmd; |
1069 | break; | |
1070 | /* | |
1071 | * FIXME add back in some support for | |
1072 | * soft_reset devices. | |
1073 | */ | |
1074 | } | |
1075 | } | |
1076 | ||
1077 | if (!chan_scmd) | |
1078 | continue; | |
1079 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BRST chan:" | |
1080 | " %d\n", current->comm, | |
1081 | channel)); | |
1082 | rtn = scsi_try_bus_reset(chan_scmd); | |
1083 | if (rtn == SUCCESS) { | |
937abeaa | 1084 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
422c0d61 | 1085 | if (channel == scmd_channel(scmd)) |
1da177e4 LT |
1086 | if (!scsi_device_online(scmd->device) || |
1087 | !scsi_eh_tur(scmd)) | |
1088 | scsi_eh_finish_cmd(scmd, | |
1089 | done_q); | |
1090 | } | |
1091 | } else { | |
1092 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BRST" | |
1093 | " failed chan: %d\n", | |
1094 | current->comm, | |
1095 | channel)); | |
1096 | } | |
1097 | } | |
1098 | return list_empty(work_q); | |
1099 | } | |
1100 | ||
1101 | /** | |
1102 | * scsi_eh_host_reset - send a host reset | |
1103 | * @work_q: list_head for processed commands. | |
1104 | * @done_q: list_head for processed commands. | |
1105 | **/ | |
1106 | static int scsi_eh_host_reset(struct list_head *work_q, | |
1107 | struct list_head *done_q) | |
1108 | { | |
937abeaa | 1109 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1110 | int rtn; |
1da177e4 LT |
1111 | |
1112 | if (!list_empty(work_q)) { | |
1113 | scmd = list_entry(work_q->next, | |
1114 | struct scsi_cmnd, eh_entry); | |
1115 | ||
1116 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending HRST\n" | |
1117 | , current->comm)); | |
1118 | ||
1119 | rtn = scsi_try_host_reset(scmd); | |
1120 | if (rtn == SUCCESS) { | |
937abeaa | 1121 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1da177e4 LT |
1122 | if (!scsi_device_online(scmd->device) || |
1123 | (!scsi_eh_try_stu(scmd) && !scsi_eh_tur(scmd)) || | |
1124 | !scsi_eh_tur(scmd)) | |
1125 | scsi_eh_finish_cmd(scmd, done_q); | |
1126 | } | |
1127 | } else { | |
1128 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: HRST" | |
1129 | " failed\n", | |
1130 | current->comm)); | |
1131 | } | |
1132 | } | |
1133 | return list_empty(work_q); | |
1134 | } | |
1135 | ||
1136 | /** | |
1137 | * scsi_eh_offline_sdevs - offline scsi devices that fail to recover | |
1138 | * @work_q: list_head for processed commands. | |
1139 | * @done_q: list_head for processed commands. | |
1140 | * | |
1141 | **/ | |
1142 | static void scsi_eh_offline_sdevs(struct list_head *work_q, | |
1143 | struct list_head *done_q) | |
1144 | { | |
937abeaa | 1145 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1146 | |
937abeaa | 1147 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
9ccfc756 JB |
1148 | sdev_printk(KERN_INFO, scmd->device, |
1149 | "scsi: Device offlined - not" | |
1150 | " ready after error recovery\n"); | |
1da177e4 | 1151 | scsi_device_set_state(scmd->device, SDEV_OFFLINE); |
3111b0d1 | 1152 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) { |
1da177e4 LT |
1153 | /* |
1154 | * FIXME: Handle lost cmds. | |
1155 | */ | |
1156 | } | |
1157 | scsi_eh_finish_cmd(scmd, done_q); | |
1158 | } | |
1159 | return; | |
1160 | } | |
1161 | ||
1162 | /** | |
1163 | * scsi_decide_disposition - Disposition a cmd on return from LLD. | |
1164 | * @scmd: SCSI cmd to examine. | |
1165 | * | |
1166 | * Notes: | |
1167 | * This is *only* called when we are examining the status after sending | |
1168 | * out the actual data command. any commands that are queued for error | |
1169 | * recovery (e.g. test_unit_ready) do *not* come through here. | |
1170 | * | |
1171 | * When this routine returns failed, it means the error handler thread | |
1172 | * is woken. In cases where the error code indicates an error that | |
1173 | * doesn't require the error handler read (i.e. we don't need to | |
1174 | * abort/reset), this function should return SUCCESS. | |
1175 | **/ | |
1176 | int scsi_decide_disposition(struct scsi_cmnd *scmd) | |
1177 | { | |
1178 | int rtn; | |
1179 | ||
1180 | /* | |
1181 | * if the device is offline, then we clearly just pass the result back | |
1182 | * up to the top level. | |
1183 | */ | |
1184 | if (!scsi_device_online(scmd->device)) { | |
1185 | SCSI_LOG_ERROR_RECOVERY(5, printk("%s: device offline - report" | |
1186 | " as SUCCESS\n", | |
1187 | __FUNCTION__)); | |
1188 | return SUCCESS; | |
1189 | } | |
1190 | ||
1191 | /* | |
1192 | * first check the host byte, to see if there is anything in there | |
1193 | * that would indicate what we need to do. | |
1194 | */ | |
1195 | switch (host_byte(scmd->result)) { | |
1196 | case DID_PASSTHROUGH: | |
1197 | /* | |
1198 | * no matter what, pass this through to the upper layer. | |
1199 | * nuke this special code so that it looks like we are saying | |
1200 | * did_ok. | |
1201 | */ | |
1202 | scmd->result &= 0xff00ffff; | |
1203 | return SUCCESS; | |
1204 | case DID_OK: | |
1205 | /* | |
1206 | * looks good. drop through, and check the next byte. | |
1207 | */ | |
1208 | break; | |
1209 | case DID_NO_CONNECT: | |
1210 | case DID_BAD_TARGET: | |
1211 | case DID_ABORT: | |
1212 | /* | |
1213 | * note - this means that we just report the status back | |
1214 | * to the top level driver, not that we actually think | |
1215 | * that it indicates SUCCESS. | |
1216 | */ | |
1217 | return SUCCESS; | |
1218 | /* | |
1219 | * when the low level driver returns did_soft_error, | |
1220 | * it is responsible for keeping an internal retry counter | |
1221 | * in order to avoid endless loops (db) | |
1222 | * | |
1223 | * actually this is a bug in this function here. we should | |
1224 | * be mindful of the maximum number of retries specified | |
1225 | * and not get stuck in a loop. | |
1226 | */ | |
1227 | case DID_SOFT_ERROR: | |
1228 | goto maybe_retry; | |
1229 | case DID_IMM_RETRY: | |
1230 | return NEEDS_RETRY; | |
1231 | ||
bf341919 | 1232 | case DID_REQUEUE: |
1233 | return ADD_TO_MLQUEUE; | |
1234 | ||
1da177e4 LT |
1235 | case DID_ERROR: |
1236 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1237 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1238 | /* | |
1239 | * execute reservation conflict processing code | |
1240 | * lower down | |
1241 | */ | |
1242 | break; | |
1243 | /* fallthrough */ | |
1244 | ||
1245 | case DID_BUS_BUSY: | |
1246 | case DID_PARITY: | |
1247 | goto maybe_retry; | |
1248 | case DID_TIME_OUT: | |
1249 | /* | |
1250 | * when we scan the bus, we get timeout messages for | |
1251 | * these commands if there is no device available. | |
1252 | * other hosts report did_no_connect for the same thing. | |
1253 | */ | |
1254 | if ((scmd->cmnd[0] == TEST_UNIT_READY || | |
1255 | scmd->cmnd[0] == INQUIRY)) { | |
1256 | return SUCCESS; | |
1257 | } else { | |
1258 | return FAILED; | |
1259 | } | |
1260 | case DID_RESET: | |
1261 | return SUCCESS; | |
1262 | default: | |
1263 | return FAILED; | |
1264 | } | |
1265 | ||
1266 | /* | |
1267 | * next, check the message byte. | |
1268 | */ | |
1269 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
1270 | return FAILED; | |
1271 | ||
1272 | /* | |
1273 | * check the status byte to see if this indicates anything special. | |
1274 | */ | |
1275 | switch (status_byte(scmd->result)) { | |
1276 | case QUEUE_FULL: | |
1277 | /* | |
1278 | * the case of trying to send too many commands to a | |
1279 | * tagged queueing device. | |
1280 | */ | |
1281 | case BUSY: | |
1282 | /* | |
1283 | * device can't talk to us at the moment. Should only | |
1284 | * occur (SAM-3) when the task queue is empty, so will cause | |
1285 | * the empty queue handling to trigger a stall in the | |
1286 | * device. | |
1287 | */ | |
1288 | return ADD_TO_MLQUEUE; | |
1289 | case GOOD: | |
1290 | case COMMAND_TERMINATED: | |
1291 | case TASK_ABORTED: | |
1292 | return SUCCESS; | |
1293 | case CHECK_CONDITION: | |
1294 | rtn = scsi_check_sense(scmd); | |
1295 | if (rtn == NEEDS_RETRY) | |
1296 | goto maybe_retry; | |
1297 | /* if rtn == FAILED, we have no sense information; | |
1298 | * returning FAILED will wake the error handler thread | |
1299 | * to collect the sense and redo the decide | |
1300 | * disposition */ | |
1301 | return rtn; | |
1302 | case CONDITION_GOOD: | |
1303 | case INTERMEDIATE_GOOD: | |
1304 | case INTERMEDIATE_C_GOOD: | |
1305 | case ACA_ACTIVE: | |
1306 | /* | |
1307 | * who knows? FIXME(eric) | |
1308 | */ | |
1309 | return SUCCESS; | |
1310 | ||
1311 | case RESERVATION_CONFLICT: | |
9ccfc756 JB |
1312 | sdev_printk(KERN_INFO, scmd->device, |
1313 | "reservation conflict\n"); | |
1da177e4 LT |
1314 | return SUCCESS; /* causes immediate i/o error */ |
1315 | default: | |
1316 | return FAILED; | |
1317 | } | |
1318 | return FAILED; | |
1319 | ||
1320 | maybe_retry: | |
1321 | ||
1322 | /* we requeue for retry because the error was retryable, and | |
1323 | * the request was not marked fast fail. Note that above, | |
1324 | * even if the request is marked fast fail, we still requeue | |
1325 | * for queue congestion conditions (QUEUE_FULL or BUSY) */ | |
8884efab | 1326 | if ((++scmd->retries) <= scmd->allowed |
1da177e4 LT |
1327 | && !blk_noretry_request(scmd->request)) { |
1328 | return NEEDS_RETRY; | |
1329 | } else { | |
1330 | /* | |
1331 | * no more retries - report this one back to upper level. | |
1332 | */ | |
1333 | return SUCCESS; | |
1334 | } | |
1335 | } | |
1336 | ||
1da177e4 LT |
1337 | /** |
1338 | * scsi_eh_lock_door - Prevent medium removal for the specified device | |
1339 | * @sdev: SCSI device to prevent medium removal | |
1340 | * | |
1341 | * Locking: | |
1342 | * We must be called from process context; scsi_allocate_request() | |
1343 | * may sleep. | |
1344 | * | |
1345 | * Notes: | |
1346 | * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the | |
1347 | * head of the devices request queue, and continue. | |
1348 | * | |
1349 | * Bugs: | |
1350 | * scsi_allocate_request() may sleep waiting for existing requests to | |
1351 | * be processed. However, since we haven't kicked off any request | |
1352 | * processing for this host, this may deadlock. | |
1353 | * | |
1354 | * If scsi_allocate_request() fails for what ever reason, we | |
1355 | * completely forget to lock the door. | |
1356 | **/ | |
1357 | static void scsi_eh_lock_door(struct scsi_device *sdev) | |
1358 | { | |
6e68af66 | 1359 | unsigned char cmnd[MAX_COMMAND_SIZE]; |
1da177e4 | 1360 | |
6e68af66 MC |
1361 | cmnd[0] = ALLOW_MEDIUM_REMOVAL; |
1362 | cmnd[1] = 0; | |
1363 | cmnd[2] = 0; | |
1364 | cmnd[3] = 0; | |
1365 | cmnd[4] = SCSI_REMOVAL_PREVENT; | |
1366 | cmnd[5] = 0; | |
1da177e4 | 1367 | |
bb1d1073 | 1368 | scsi_execute_async(sdev, cmnd, 6, DMA_NONE, NULL, 0, 0, 10 * HZ, |
6e68af66 | 1369 | 5, NULL, NULL, GFP_KERNEL); |
1da177e4 LT |
1370 | } |
1371 | ||
1372 | ||
1373 | /** | |
1374 | * scsi_restart_operations - restart io operations to the specified host. | |
1375 | * @shost: Host we are restarting. | |
1376 | * | |
1377 | * Notes: | |
1378 | * When we entered the error handler, we blocked all further i/o to | |
1379 | * this device. we need to 'reverse' this process. | |
1380 | **/ | |
1381 | static void scsi_restart_operations(struct Scsi_Host *shost) | |
1382 | { | |
1383 | struct scsi_device *sdev; | |
939647ee | 1384 | unsigned long flags; |
1da177e4 LT |
1385 | |
1386 | /* | |
1387 | * If the door was locked, we need to insert a door lock request | |
1388 | * onto the head of the SCSI request queue for the device. There | |
1389 | * is no point trying to lock the door of an off-line device. | |
1390 | */ | |
1391 | shost_for_each_device(sdev, shost) { | |
1392 | if (scsi_device_online(sdev) && sdev->locked) | |
1393 | scsi_eh_lock_door(sdev); | |
1394 | } | |
1395 | ||
1396 | /* | |
1397 | * next free up anything directly waiting upon the host. this | |
1398 | * will be requests for character device operations, and also for | |
1399 | * ioctls to queued block devices. | |
1400 | */ | |
1401 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: waking up host to restart\n", | |
1402 | __FUNCTION__)); | |
1403 | ||
939647ee JB |
1404 | spin_lock_irqsave(shost->host_lock, flags); |
1405 | if (scsi_host_set_state(shost, SHOST_RUNNING)) | |
1406 | if (scsi_host_set_state(shost, SHOST_CANCEL)) | |
1407 | BUG_ON(scsi_host_set_state(shost, SHOST_DEL)); | |
1408 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
1409 | |
1410 | wake_up(&shost->host_wait); | |
1411 | ||
1412 | /* | |
1413 | * finally we need to re-initiate requests that may be pending. we will | |
1414 | * have had everything blocked while error handling is taking place, and | |
1415 | * now that error recovery is done, we will need to ensure that these | |
1416 | * requests are started. | |
1417 | */ | |
1418 | scsi_run_host_queues(shost); | |
1419 | } | |
1420 | ||
1421 | /** | |
1422 | * scsi_eh_ready_devs - check device ready state and recover if not. | |
1423 | * @shost: host to be recovered. | |
1424 | * @eh_done_q: list_head for processed commands. | |
1425 | * | |
1426 | **/ | |
dca84e46 DW |
1427 | void scsi_eh_ready_devs(struct Scsi_Host *shost, |
1428 | struct list_head *work_q, | |
1429 | struct list_head *done_q) | |
1da177e4 LT |
1430 | { |
1431 | if (!scsi_eh_stu(shost, work_q, done_q)) | |
1432 | if (!scsi_eh_bus_device_reset(shost, work_q, done_q)) | |
1433 | if (!scsi_eh_bus_reset(shost, work_q, done_q)) | |
1434 | if (!scsi_eh_host_reset(work_q, done_q)) | |
1435 | scsi_eh_offline_sdevs(work_q, done_q); | |
1436 | } | |
dca84e46 | 1437 | EXPORT_SYMBOL_GPL(scsi_eh_ready_devs); |
1da177e4 LT |
1438 | |
1439 | /** | |
1440 | * scsi_eh_flush_done_q - finish processed commands or retry them. | |
1441 | * @done_q: list_head of processed commands. | |
1442 | * | |
1443 | **/ | |
041c5fc3 | 1444 | void scsi_eh_flush_done_q(struct list_head *done_q) |
1da177e4 | 1445 | { |
937abeaa | 1446 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1447 | |
937abeaa CH |
1448 | list_for_each_entry_safe(scmd, next, done_q, eh_entry) { |
1449 | list_del_init(&scmd->eh_entry); | |
1da177e4 LT |
1450 | if (scsi_device_online(scmd->device) && |
1451 | !blk_noretry_request(scmd->request) && | |
8884efab | 1452 | (++scmd->retries <= scmd->allowed)) { |
1da177e4 LT |
1453 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush" |
1454 | " retry cmd: %p\n", | |
1455 | current->comm, | |
1456 | scmd)); | |
1457 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); | |
1458 | } else { | |
793698ce PM |
1459 | /* |
1460 | * If just we got sense for the device (called | |
1461 | * scsi_eh_get_sense), scmd->result is already | |
1462 | * set, do not set DRIVER_TIMEOUT. | |
1463 | */ | |
1da177e4 LT |
1464 | if (!scmd->result) |
1465 | scmd->result |= (DRIVER_TIMEOUT << 24); | |
1466 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush finish" | |
1467 | " cmd: %p\n", | |
1468 | current->comm, scmd)); | |
1469 | scsi_finish_command(scmd); | |
1470 | } | |
1471 | } | |
1472 | } | |
041c5fc3 | 1473 | EXPORT_SYMBOL(scsi_eh_flush_done_q); |
1da177e4 LT |
1474 | |
1475 | /** | |
1476 | * scsi_unjam_host - Attempt to fix a host which has a cmd that failed. | |
1477 | * @shost: Host to unjam. | |
1478 | * | |
1479 | * Notes: | |
1480 | * When we come in here, we *know* that all commands on the bus have | |
1481 | * either completed, failed or timed out. we also know that no further | |
1482 | * commands are being sent to the host, so things are relatively quiet | |
1483 | * and we have freedom to fiddle with things as we wish. | |
1484 | * | |
1485 | * This is only the *default* implementation. it is possible for | |
1486 | * individual drivers to supply their own version of this function, and | |
1487 | * if the maintainer wishes to do this, it is strongly suggested that | |
1488 | * this function be taken as a template and modified. this function | |
1489 | * was designed to correctly handle problems for about 95% of the | |
1490 | * different cases out there, and it should always provide at least a | |
1491 | * reasonable amount of error recovery. | |
1492 | * | |
1493 | * Any command marked 'failed' or 'timeout' must eventually have | |
1494 | * scsi_finish_cmd() called for it. we do all of the retry stuff | |
1495 | * here, so when we restart the host after we return it should have an | |
1496 | * empty queue. | |
1497 | **/ | |
1498 | static void scsi_unjam_host(struct Scsi_Host *shost) | |
1499 | { | |
1500 | unsigned long flags; | |
1501 | LIST_HEAD(eh_work_q); | |
1502 | LIST_HEAD(eh_done_q); | |
1503 | ||
1504 | spin_lock_irqsave(shost->host_lock, flags); | |
1505 | list_splice_init(&shost->eh_cmd_q, &eh_work_q); | |
1506 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1507 | ||
1508 | SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost, &eh_work_q)); | |
1509 | ||
1510 | if (!scsi_eh_get_sense(&eh_work_q, &eh_done_q)) | |
1511 | if (!scsi_eh_abort_cmds(&eh_work_q, &eh_done_q)) | |
1512 | scsi_eh_ready_devs(shost, &eh_work_q, &eh_done_q); | |
1513 | ||
1514 | scsi_eh_flush_done_q(&eh_done_q); | |
1515 | } | |
1516 | ||
1517 | /** | |
ad42eb1b | 1518 | * scsi_error_handler - SCSI error handler thread |
1da177e4 LT |
1519 | * @data: Host for which we are running. |
1520 | * | |
1521 | * Notes: | |
ad42eb1b CH |
1522 | * This is the main error handling loop. This is run as a kernel thread |
1523 | * for every SCSI host and handles all error handling activity. | |
1da177e4 LT |
1524 | **/ |
1525 | int scsi_error_handler(void *data) | |
1526 | { | |
ad42eb1b | 1527 | struct Scsi_Host *shost = data; |
1da177e4 | 1528 | |
1da177e4 | 1529 | current->flags |= PF_NOFREEZE; |
1da177e4 LT |
1530 | |
1531 | /* | |
ad42eb1b CH |
1532 | * We use TASK_INTERRUPTIBLE so that the thread is not |
1533 | * counted against the load average as a running process. | |
1534 | * We never actually get interrupted because kthread_run | |
1535 | * disables singal delivery for the created thread. | |
1da177e4 | 1536 | */ |
3ed7a470 JB |
1537 | set_current_state(TASK_INTERRUPTIBLE); |
1538 | while (!kthread_should_stop()) { | |
ee7863bc | 1539 | if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) || |
3ed7a470 | 1540 | shost->host_failed != shost->host_busy) { |
ad42eb1b CH |
1541 | SCSI_LOG_ERROR_RECOVERY(1, |
1542 | printk("Error handler scsi_eh_%d sleeping\n", | |
1543 | shost->host_no)); | |
3ed7a470 JB |
1544 | schedule(); |
1545 | set_current_state(TASK_INTERRUPTIBLE); | |
1546 | continue; | |
1547 | } | |
1da177e4 | 1548 | |
3ed7a470 | 1549 | __set_current_state(TASK_RUNNING); |
ad42eb1b CH |
1550 | SCSI_LOG_ERROR_RECOVERY(1, |
1551 | printk("Error handler scsi_eh_%d waking up\n", | |
1552 | shost->host_no)); | |
1da177e4 | 1553 | |
1da177e4 LT |
1554 | /* |
1555 | * We have a host that is failing for some reason. Figure out | |
1556 | * what we need to do to get it up and online again (if we can). | |
1557 | * If we fail, we end up taking the thing offline. | |
1558 | */ | |
9227c33d CH |
1559 | if (shost->transportt->eh_strategy_handler) |
1560 | shost->transportt->eh_strategy_handler(shost); | |
1da177e4 LT |
1561 | else |
1562 | scsi_unjam_host(shost); | |
1563 | ||
1da177e4 LT |
1564 | /* |
1565 | * Note - if the above fails completely, the action is to take | |
1566 | * individual devices offline and flush the queue of any | |
1567 | * outstanding requests that may have been pending. When we | |
1568 | * restart, we restart any I/O to any other devices on the bus | |
1569 | * which are still online. | |
1570 | */ | |
1571 | scsi_restart_operations(shost); | |
3ed7a470 | 1572 | set_current_state(TASK_INTERRUPTIBLE); |
1da177e4 | 1573 | } |
461a0ffb SR |
1574 | __set_current_state(TASK_RUNNING); |
1575 | ||
ad42eb1b CH |
1576 | SCSI_LOG_ERROR_RECOVERY(1, |
1577 | printk("Error handler scsi_eh_%d exiting\n", shost->host_no)); | |
3ed7a470 | 1578 | shost->ehandler = NULL; |
1da177e4 LT |
1579 | return 0; |
1580 | } | |
1581 | ||
1582 | /* | |
1583 | * Function: scsi_report_bus_reset() | |
1584 | * | |
1585 | * Purpose: Utility function used by low-level drivers to report that | |
1586 | * they have observed a bus reset on the bus being handled. | |
1587 | * | |
1588 | * Arguments: shost - Host in question | |
1589 | * channel - channel on which reset was observed. | |
1590 | * | |
1591 | * Returns: Nothing | |
1592 | * | |
1593 | * Lock status: Host lock must be held. | |
1594 | * | |
1595 | * Notes: This only needs to be called if the reset is one which | |
1596 | * originates from an unknown location. Resets originated | |
1597 | * by the mid-level itself don't need to call this, but there | |
1598 | * should be no harm. | |
1599 | * | |
1600 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
1601 | * is properly treated. | |
1602 | */ | |
1603 | void scsi_report_bus_reset(struct Scsi_Host *shost, int channel) | |
1604 | { | |
1605 | struct scsi_device *sdev; | |
1606 | ||
1607 | __shost_for_each_device(sdev, shost) { | |
422c0d61 | 1608 | if (channel == sdev_channel(sdev)) { |
1da177e4 LT |
1609 | sdev->was_reset = 1; |
1610 | sdev->expecting_cc_ua = 1; | |
1611 | } | |
1612 | } | |
1613 | } | |
1614 | EXPORT_SYMBOL(scsi_report_bus_reset); | |
1615 | ||
1616 | /* | |
1617 | * Function: scsi_report_device_reset() | |
1618 | * | |
1619 | * Purpose: Utility function used by low-level drivers to report that | |
1620 | * they have observed a device reset on the device being handled. | |
1621 | * | |
1622 | * Arguments: shost - Host in question | |
1623 | * channel - channel on which reset was observed | |
1624 | * target - target on which reset was observed | |
1625 | * | |
1626 | * Returns: Nothing | |
1627 | * | |
1628 | * Lock status: Host lock must be held | |
1629 | * | |
1630 | * Notes: This only needs to be called if the reset is one which | |
1631 | * originates from an unknown location. Resets originated | |
1632 | * by the mid-level itself don't need to call this, but there | |
1633 | * should be no harm. | |
1634 | * | |
1635 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
1636 | * is properly treated. | |
1637 | */ | |
1638 | void scsi_report_device_reset(struct Scsi_Host *shost, int channel, int target) | |
1639 | { | |
1640 | struct scsi_device *sdev; | |
1641 | ||
1642 | __shost_for_each_device(sdev, shost) { | |
422c0d61 JG |
1643 | if (channel == sdev_channel(sdev) && |
1644 | target == sdev_id(sdev)) { | |
1da177e4 LT |
1645 | sdev->was_reset = 1; |
1646 | sdev->expecting_cc_ua = 1; | |
1647 | } | |
1648 | } | |
1649 | } | |
1650 | EXPORT_SYMBOL(scsi_report_device_reset); | |
1651 | ||
1652 | static void | |
1653 | scsi_reset_provider_done_command(struct scsi_cmnd *scmd) | |
1654 | { | |
1655 | } | |
1656 | ||
1657 | /* | |
1658 | * Function: scsi_reset_provider | |
1659 | * | |
1660 | * Purpose: Send requested reset to a bus or device at any phase. | |
1661 | * | |
1662 | * Arguments: device - device to send reset to | |
1663 | * flag - reset type (see scsi.h) | |
1664 | * | |
1665 | * Returns: SUCCESS/FAILURE. | |
1666 | * | |
1667 | * Notes: This is used by the SCSI Generic driver to provide | |
1668 | * Bus/Device reset capability. | |
1669 | */ | |
1670 | int | |
1671 | scsi_reset_provider(struct scsi_device *dev, int flag) | |
1672 | { | |
1673 | struct scsi_cmnd *scmd = scsi_get_command(dev, GFP_KERNEL); | |
d7a1bb0a | 1674 | struct Scsi_Host *shost = dev->host; |
1da177e4 | 1675 | struct request req; |
d7a1bb0a | 1676 | unsigned long flags; |
1da177e4 LT |
1677 | int rtn; |
1678 | ||
1679 | scmd->request = &req; | |
1680 | memset(&scmd->eh_timeout, 0, sizeof(scmd->eh_timeout)); | |
b4edcbca | 1681 | |
1da177e4 LT |
1682 | memset(&scmd->cmnd, '\0', sizeof(scmd->cmnd)); |
1683 | ||
1684 | scmd->scsi_done = scsi_reset_provider_done_command; | |
1685 | scmd->done = NULL; | |
1da177e4 LT |
1686 | scmd->request_buffer = NULL; |
1687 | scmd->request_bufflen = 0; | |
1da177e4 LT |
1688 | |
1689 | scmd->cmd_len = 0; | |
1690 | ||
1691 | scmd->sc_data_direction = DMA_BIDIRECTIONAL; | |
1da177e4 LT |
1692 | |
1693 | init_timer(&scmd->eh_timeout); | |
1694 | ||
1695 | /* | |
1696 | * Sometimes the command can get back into the timer chain, | |
1697 | * so use the pid as an identifier. | |
1698 | */ | |
1699 | scmd->pid = 0; | |
1700 | ||
d7a1bb0a JS |
1701 | spin_lock_irqsave(shost->host_lock, flags); |
1702 | shost->tmf_in_progress = 1; | |
1703 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1704 | ||
1da177e4 LT |
1705 | switch (flag) { |
1706 | case SCSI_TRY_RESET_DEVICE: | |
1707 | rtn = scsi_try_bus_device_reset(scmd); | |
1708 | if (rtn == SUCCESS) | |
1709 | break; | |
1710 | /* FALLTHROUGH */ | |
1711 | case SCSI_TRY_RESET_BUS: | |
1712 | rtn = scsi_try_bus_reset(scmd); | |
1713 | if (rtn == SUCCESS) | |
1714 | break; | |
1715 | /* FALLTHROUGH */ | |
1716 | case SCSI_TRY_RESET_HOST: | |
1717 | rtn = scsi_try_host_reset(scmd); | |
1718 | break; | |
1719 | default: | |
1720 | rtn = FAILED; | |
1721 | } | |
1722 | ||
d7a1bb0a JS |
1723 | spin_lock_irqsave(shost->host_lock, flags); |
1724 | shost->tmf_in_progress = 0; | |
1725 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1726 | ||
1727 | /* | |
1728 | * be sure to wake up anyone who was sleeping or had their queue | |
1729 | * suspended while we performed the TMF. | |
1730 | */ | |
1731 | SCSI_LOG_ERROR_RECOVERY(3, | |
1732 | printk("%s: waking up host to restart after TMF\n", | |
1733 | __FUNCTION__)); | |
1734 | ||
1735 | wake_up(&shost->host_wait); | |
1736 | ||
1737 | scsi_run_host_queues(shost); | |
1738 | ||
1da177e4 LT |
1739 | scsi_next_command(scmd); |
1740 | return rtn; | |
1741 | } | |
1742 | EXPORT_SYMBOL(scsi_reset_provider); | |
1743 | ||
1744 | /** | |
1745 | * scsi_normalize_sense - normalize main elements from either fixed or | |
1746 | * descriptor sense data format into a common format. | |
1747 | * | |
1748 | * @sense_buffer: byte array containing sense data returned by device | |
1749 | * @sb_len: number of valid bytes in sense_buffer | |
1750 | * @sshdr: pointer to instance of structure that common | |
1751 | * elements are written to. | |
1752 | * | |
1753 | * Notes: | |
1754 | * The "main elements" from sense data are: response_code, sense_key, | |
1755 | * asc, ascq and additional_length (only for descriptor format). | |
1756 | * | |
1757 | * Typically this function can be called after a device has | |
1758 | * responded to a SCSI command with the CHECK_CONDITION status. | |
1759 | * | |
1760 | * Return value: | |
1761 | * 1 if valid sense data information found, else 0; | |
1762 | **/ | |
1763 | int scsi_normalize_sense(const u8 *sense_buffer, int sb_len, | |
1764 | struct scsi_sense_hdr *sshdr) | |
1765 | { | |
33aa687d | 1766 | if (!sense_buffer || !sb_len) |
1da177e4 LT |
1767 | return 0; |
1768 | ||
1769 | memset(sshdr, 0, sizeof(struct scsi_sense_hdr)); | |
1770 | ||
1771 | sshdr->response_code = (sense_buffer[0] & 0x7f); | |
33aa687d JB |
1772 | |
1773 | if (!scsi_sense_valid(sshdr)) | |
1774 | return 0; | |
1775 | ||
1da177e4 LT |
1776 | if (sshdr->response_code >= 0x72) { |
1777 | /* | |
1778 | * descriptor format | |
1779 | */ | |
1780 | if (sb_len > 1) | |
1781 | sshdr->sense_key = (sense_buffer[1] & 0xf); | |
1782 | if (sb_len > 2) | |
1783 | sshdr->asc = sense_buffer[2]; | |
1784 | if (sb_len > 3) | |
1785 | sshdr->ascq = sense_buffer[3]; | |
1786 | if (sb_len > 7) | |
1787 | sshdr->additional_length = sense_buffer[7]; | |
1788 | } else { | |
1789 | /* | |
1790 | * fixed format | |
1791 | */ | |
1792 | if (sb_len > 2) | |
1793 | sshdr->sense_key = (sense_buffer[2] & 0xf); | |
1794 | if (sb_len > 7) { | |
1795 | sb_len = (sb_len < (sense_buffer[7] + 8)) ? | |
1796 | sb_len : (sense_buffer[7] + 8); | |
1797 | if (sb_len > 12) | |
1798 | sshdr->asc = sense_buffer[12]; | |
1799 | if (sb_len > 13) | |
1800 | sshdr->ascq = sense_buffer[13]; | |
1801 | } | |
1802 | } | |
1803 | ||
1804 | return 1; | |
1805 | } | |
1806 | EXPORT_SYMBOL(scsi_normalize_sense); | |
1807 | ||
1da177e4 LT |
1808 | int scsi_command_normalize_sense(struct scsi_cmnd *cmd, |
1809 | struct scsi_sense_hdr *sshdr) | |
1810 | { | |
1811 | return scsi_normalize_sense(cmd->sense_buffer, | |
1812 | sizeof(cmd->sense_buffer), sshdr); | |
1813 | } | |
1814 | EXPORT_SYMBOL(scsi_command_normalize_sense); | |
1815 | ||
1816 | /** | |
1817 | * scsi_sense_desc_find - search for a given descriptor type in | |
1818 | * descriptor sense data format. | |
1819 | * | |
1820 | * @sense_buffer: byte array of descriptor format sense data | |
1821 | * @sb_len: number of valid bytes in sense_buffer | |
1822 | * @desc_type: value of descriptor type to find | |
1823 | * (e.g. 0 -> information) | |
1824 | * | |
1825 | * Notes: | |
1826 | * only valid when sense data is in descriptor format | |
1827 | * | |
1828 | * Return value: | |
1829 | * pointer to start of (first) descriptor if found else NULL | |
1830 | **/ | |
1831 | const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len, | |
1832 | int desc_type) | |
1833 | { | |
1834 | int add_sen_len, add_len, desc_len, k; | |
1835 | const u8 * descp; | |
1836 | ||
1837 | if ((sb_len < 8) || (0 == (add_sen_len = sense_buffer[7]))) | |
1838 | return NULL; | |
1839 | if ((sense_buffer[0] < 0x72) || (sense_buffer[0] > 0x73)) | |
1840 | return NULL; | |
1841 | add_sen_len = (add_sen_len < (sb_len - 8)) ? | |
1842 | add_sen_len : (sb_len - 8); | |
1843 | descp = &sense_buffer[8]; | |
1844 | for (desc_len = 0, k = 0; k < add_sen_len; k += desc_len) { | |
1845 | descp += desc_len; | |
1846 | add_len = (k < (add_sen_len - 1)) ? descp[1]: -1; | |
1847 | desc_len = add_len + 2; | |
1848 | if (descp[0] == desc_type) | |
1849 | return descp; | |
1850 | if (add_len < 0) // short descriptor ?? | |
1851 | break; | |
1852 | } | |
1853 | return NULL; | |
1854 | } | |
1855 | EXPORT_SYMBOL(scsi_sense_desc_find); | |
1856 | ||
1857 | /** | |
1858 | * scsi_get_sense_info_fld - attempts to get information field from | |
1859 | * sense data (either fixed or descriptor format) | |
1860 | * | |
1861 | * @sense_buffer: byte array of sense data | |
1862 | * @sb_len: number of valid bytes in sense_buffer | |
1863 | * @info_out: pointer to 64 integer where 8 or 4 byte information | |
1864 | * field will be placed if found. | |
1865 | * | |
1866 | * Return value: | |
1867 | * 1 if information field found, 0 if not found. | |
1868 | **/ | |
1869 | int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len, | |
1870 | u64 * info_out) | |
1871 | { | |
1872 | int j; | |
1873 | const u8 * ucp; | |
1874 | u64 ull; | |
1875 | ||
1876 | if (sb_len < 7) | |
1877 | return 0; | |
1878 | switch (sense_buffer[0] & 0x7f) { | |
1879 | case 0x70: | |
1880 | case 0x71: | |
1881 | if (sense_buffer[0] & 0x80) { | |
1882 | *info_out = (sense_buffer[3] << 24) + | |
1883 | (sense_buffer[4] << 16) + | |
1884 | (sense_buffer[5] << 8) + sense_buffer[6]; | |
1885 | return 1; | |
1886 | } else | |
1887 | return 0; | |
1888 | case 0x72: | |
1889 | case 0x73: | |
1890 | ucp = scsi_sense_desc_find(sense_buffer, sb_len, | |
1891 | 0 /* info desc */); | |
1892 | if (ucp && (0xa == ucp[1])) { | |
1893 | ull = 0; | |
1894 | for (j = 0; j < 8; ++j) { | |
1895 | if (j > 0) | |
1896 | ull <<= 8; | |
1897 | ull |= ucp[4 + j]; | |
1898 | } | |
1899 | *info_out = ull; | |
1900 | return 1; | |
1901 | } else | |
1902 | return 0; | |
1903 | default: | |
1904 | return 0; | |
1905 | } | |
1906 | } | |
1907 | EXPORT_SYMBOL(scsi_get_sense_info_fld); |