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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 | |
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> | |
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> | |
28 | ||
29 | #include <scsi/scsi.h> | |
beb40487 | 30 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
31 | #include <scsi/scsi_dbg.h> |
32 | #include <scsi/scsi_device.h> | |
33 | #include <scsi/scsi_eh.h> | |
c829c394 | 34 | #include <scsi/scsi_transport.h> |
1da177e4 LT |
35 | #include <scsi/scsi_host.h> |
36 | #include <scsi/scsi_ioctl.h> | |
1da177e4 LT |
37 | |
38 | #include "scsi_priv.h" | |
39 | #include "scsi_logging.h" | |
79ee8304 | 40 | #include "scsi_transport_api.h" |
1da177e4 | 41 | |
bf816235 KT |
42 | #include <trace/events/scsi.h> |
43 | ||
1da177e4 | 44 | #define SENSE_TIMEOUT (10*HZ) |
1da177e4 LT |
45 | |
46 | /* | |
47 | * These should *probably* be handled by the host itself. | |
48 | * Since it is allowed to sleep, it probably should. | |
49 | */ | |
50 | #define BUS_RESET_SETTLE_TIME (10) | |
51 | #define HOST_RESET_SETTLE_TIME (10) | |
52 | ||
53 | /* called with shost->host_lock held */ | |
54 | void scsi_eh_wakeup(struct Scsi_Host *shost) | |
55 | { | |
56 | if (shost->host_busy == shost->host_failed) { | |
bf816235 | 57 | trace_scsi_eh_wakeup(shost); |
3ed7a470 | 58 | wake_up_process(shost->ehandler); |
1da177e4 LT |
59 | SCSI_LOG_ERROR_RECOVERY(5, |
60 | printk("Waking error handler thread\n")); | |
61 | } | |
62 | } | |
f8bbfc24 TH |
63 | |
64 | /** | |
65 | * scsi_schedule_eh - schedule EH for SCSI host | |
66 | * @shost: SCSI host to invoke error handling on. | |
67 | * | |
68 | * Schedule SCSI EH without scmd. | |
dc8875e1 | 69 | */ |
f8bbfc24 TH |
70 | void scsi_schedule_eh(struct Scsi_Host *shost) |
71 | { | |
72 | unsigned long flags; | |
73 | ||
74 | spin_lock_irqsave(shost->host_lock, flags); | |
75 | ||
76 | if (scsi_host_set_state(shost, SHOST_RECOVERY) == 0 || | |
77 | scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY) == 0) { | |
78 | shost->host_eh_scheduled++; | |
79 | scsi_eh_wakeup(shost); | |
80 | } | |
81 | ||
82 | spin_unlock_irqrestore(shost->host_lock, flags); | |
83 | } | |
84 | EXPORT_SYMBOL_GPL(scsi_schedule_eh); | |
1da177e4 LT |
85 | |
86 | /** | |
87 | * scsi_eh_scmd_add - add scsi cmd to error handling. | |
88 | * @scmd: scmd to run eh on. | |
89 | * @eh_flag: optional SCSI_EH flag. | |
90 | * | |
91 | * Return value: | |
92 | * 0 on failure. | |
dc8875e1 | 93 | */ |
1da177e4 LT |
94 | int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag) |
95 | { | |
96 | struct Scsi_Host *shost = scmd->device->host; | |
97 | unsigned long flags; | |
939647ee | 98 | int ret = 0; |
1da177e4 | 99 | |
3ed7a470 | 100 | if (!shost->ehandler) |
1da177e4 LT |
101 | return 0; |
102 | ||
103 | spin_lock_irqsave(shost->host_lock, flags); | |
939647ee JB |
104 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) |
105 | if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) | |
106 | goto out_unlock; | |
1da177e4 | 107 | |
939647ee | 108 | ret = 1; |
3111b0d1 | 109 | scmd->eh_eflags |= eh_flag; |
1da177e4 | 110 | list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q); |
1da177e4 LT |
111 | shost->host_failed++; |
112 | scsi_eh_wakeup(shost); | |
939647ee | 113 | out_unlock: |
1da177e4 | 114 | spin_unlock_irqrestore(shost->host_lock, flags); |
939647ee | 115 | return ret; |
1da177e4 LT |
116 | } |
117 | ||
1da177e4 LT |
118 | /** |
119 | * scsi_times_out - Timeout function for normal scsi commands. | |
242f9dcb | 120 | * @req: request that is timing out. |
1da177e4 LT |
121 | * |
122 | * Notes: | |
123 | * We do not need to lock this. There is the potential for a race | |
124 | * only in that the normal completion handling might run, but if the | |
125 | * normal completion function determines that the timer has already | |
126 | * fired, then it mustn't do anything. | |
dc8875e1 | 127 | */ |
242f9dcb | 128 | enum blk_eh_timer_return scsi_times_out(struct request *req) |
1da177e4 | 129 | { |
242f9dcb | 130 | struct scsi_cmnd *scmd = req->special; |
242f9dcb | 131 | enum blk_eh_timer_return rtn = BLK_EH_NOT_HANDLED; |
6c5f8ce1 | 132 | |
bf816235 | 133 | trace_scsi_dispatch_cmd_timeout(scmd); |
1da177e4 LT |
134 | scsi_log_completion(scmd, TIMEOUT_ERROR); |
135 | ||
c829c394 | 136 | if (scmd->device->host->transportt->eh_timed_out) |
fa990781 | 137 | rtn = scmd->device->host->transportt->eh_timed_out(scmd); |
6c5f8ce1 | 138 | else if (scmd->device->host->hostt->eh_timed_out) |
fa990781 | 139 | rtn = scmd->device->host->hostt->eh_timed_out(scmd); |
1da177e4 | 140 | |
fa990781 CH |
141 | if (unlikely(rtn == BLK_EH_NOT_HANDLED && |
142 | !scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD))) { | |
939647ee | 143 | scmd->result |= DID_TIME_OUT << 16; |
fa990781 | 144 | rtn = BLK_EH_HANDLED; |
1da177e4 | 145 | } |
242f9dcb | 146 | |
fa990781 | 147 | return rtn; |
1da177e4 LT |
148 | } |
149 | ||
150 | /** | |
151 | * scsi_block_when_processing_errors - Prevent cmds from being queued. | |
152 | * @sdev: Device on which we are performing recovery. | |
153 | * | |
154 | * Description: | |
155 | * We block until the host is out of error recovery, and then check to | |
156 | * see whether the host or the device is offline. | |
157 | * | |
158 | * Return value: | |
159 | * 0 when dev was taken offline by error recovery. 1 OK to proceed. | |
dc8875e1 | 160 | */ |
1da177e4 LT |
161 | int scsi_block_when_processing_errors(struct scsi_device *sdev) |
162 | { | |
163 | int online; | |
164 | ||
939647ee | 165 | wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host)); |
1da177e4 LT |
166 | |
167 | online = scsi_device_online(sdev); | |
168 | ||
cadbd4a5 | 169 | SCSI_LOG_ERROR_RECOVERY(5, printk("%s: rtn: %d\n", __func__, |
1da177e4 LT |
170 | online)); |
171 | ||
172 | return online; | |
173 | } | |
174 | EXPORT_SYMBOL(scsi_block_when_processing_errors); | |
175 | ||
176 | #ifdef CONFIG_SCSI_LOGGING | |
177 | /** | |
178 | * scsi_eh_prt_fail_stats - Log info on failures. | |
179 | * @shost: scsi host being recovered. | |
180 | * @work_q: Queue of scsi cmds to process. | |
dc8875e1 | 181 | */ |
1da177e4 LT |
182 | static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost, |
183 | struct list_head *work_q) | |
184 | { | |
185 | struct scsi_cmnd *scmd; | |
186 | struct scsi_device *sdev; | |
187 | int total_failures = 0; | |
188 | int cmd_failed = 0; | |
189 | int cmd_cancel = 0; | |
190 | int devices_failed = 0; | |
191 | ||
192 | shost_for_each_device(sdev, shost) { | |
193 | list_for_each_entry(scmd, work_q, eh_entry) { | |
194 | if (scmd->device == sdev) { | |
195 | ++total_failures; | |
3111b0d1 | 196 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) |
1da177e4 LT |
197 | ++cmd_cancel; |
198 | else | |
199 | ++cmd_failed; | |
200 | } | |
201 | } | |
202 | ||
203 | if (cmd_cancel || cmd_failed) { | |
204 | SCSI_LOG_ERROR_RECOVERY(3, | |
9ccfc756 JB |
205 | sdev_printk(KERN_INFO, sdev, |
206 | "%s: cmds failed: %d, cancel: %d\n", | |
cadbd4a5 | 207 | __func__, cmd_failed, |
9ccfc756 | 208 | cmd_cancel)); |
1da177e4 LT |
209 | cmd_cancel = 0; |
210 | cmd_failed = 0; | |
211 | ++devices_failed; | |
212 | } | |
213 | } | |
214 | ||
215 | SCSI_LOG_ERROR_RECOVERY(2, printk("Total of %d commands on %d" | |
216 | " devices require eh work\n", | |
217 | total_failures, devices_failed)); | |
218 | } | |
219 | #endif | |
220 | ||
221 | /** | |
222 | * scsi_check_sense - Examine scsi cmd sense | |
223 | * @scmd: Cmd to have sense checked. | |
224 | * | |
225 | * Return value: | |
226 | * SUCCESS or FAILED or NEEDS_RETRY | |
227 | * | |
228 | * Notes: | |
229 | * When a deferred error is detected the current command has | |
230 | * not been executed and needs retrying. | |
dc8875e1 | 231 | */ |
1da177e4 LT |
232 | static int scsi_check_sense(struct scsi_cmnd *scmd) |
233 | { | |
a6a8d9f8 | 234 | struct scsi_device *sdev = scmd->device; |
1da177e4 LT |
235 | struct scsi_sense_hdr sshdr; |
236 | ||
237 | if (! scsi_command_normalize_sense(scmd, &sshdr)) | |
238 | return FAILED; /* no valid sense data */ | |
239 | ||
240 | if (scsi_sense_is_deferred(&sshdr)) | |
241 | return NEEDS_RETRY; | |
242 | ||
a6a8d9f8 CS |
243 | if (sdev->scsi_dh_data && sdev->scsi_dh_data->scsi_dh && |
244 | sdev->scsi_dh_data->scsi_dh->check_sense) { | |
245 | int rc; | |
246 | ||
247 | rc = sdev->scsi_dh_data->scsi_dh->check_sense(sdev, &sshdr); | |
248 | if (rc != SCSI_RETURN_NOT_HANDLED) | |
249 | return rc; | |
250 | /* handler does not care. Drop down to default handling */ | |
251 | } | |
252 | ||
1da177e4 LT |
253 | /* |
254 | * Previous logic looked for FILEMARK, EOM or ILI which are | |
255 | * mainly associated with tapes and returned SUCCESS. | |
256 | */ | |
257 | if (sshdr.response_code == 0x70) { | |
258 | /* fixed format */ | |
259 | if (scmd->sense_buffer[2] & 0xe0) | |
260 | return SUCCESS; | |
261 | } else { | |
262 | /* | |
263 | * descriptor format: look for "stream commands sense data | |
264 | * descriptor" (see SSC-3). Assume single sense data | |
265 | * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG. | |
266 | */ | |
267 | if ((sshdr.additional_length > 3) && | |
268 | (scmd->sense_buffer[8] == 0x4) && | |
269 | (scmd->sense_buffer[11] & 0xe0)) | |
270 | return SUCCESS; | |
271 | } | |
272 | ||
273 | switch (sshdr.sense_key) { | |
274 | case NO_SENSE: | |
275 | return SUCCESS; | |
276 | case RECOVERED_ERROR: | |
277 | return /* soft_error */ SUCCESS; | |
278 | ||
279 | case ABORTED_COMMAND: | |
511e44f4 MP |
280 | if (sshdr.asc == 0x10) /* DIF */ |
281 | return SUCCESS; | |
282 | ||
1da177e4 LT |
283 | return NEEDS_RETRY; |
284 | case NOT_READY: | |
285 | case UNIT_ATTENTION: | |
286 | /* | |
287 | * if we are expecting a cc/ua because of a bus reset that we | |
288 | * performed, treat this just as a retry. otherwise this is | |
289 | * information that we should pass up to the upper-level driver | |
290 | * so that we can deal with it there. | |
291 | */ | |
292 | if (scmd->device->expecting_cc_ua) { | |
293 | scmd->device->expecting_cc_ua = 0; | |
294 | return NEEDS_RETRY; | |
295 | } | |
296 | /* | |
297 | * if the device is in the process of becoming ready, we | |
298 | * should retry. | |
299 | */ | |
300 | if ((sshdr.asc == 0x04) && (sshdr.ascq == 0x01)) | |
301 | return NEEDS_RETRY; | |
302 | /* | |
303 | * if the device is not started, we need to wake | |
304 | * the error handler to start the motor | |
305 | */ | |
306 | if (scmd->device->allow_restart && | |
307 | (sshdr.asc == 0x04) && (sshdr.ascq == 0x02)) | |
308 | return FAILED; | |
77a42297 JB |
309 | |
310 | if (blk_barrier_rq(scmd->request)) | |
311 | /* | |
312 | * barrier requests should always retry on UA | |
313 | * otherwise block will get a spurious error | |
314 | */ | |
315 | return NEEDS_RETRY; | |
316 | else | |
317 | /* | |
318 | * for normal (non barrier) commands, pass the | |
319 | * UA upwards for a determination in the | |
320 | * completion functions | |
321 | */ | |
322 | return SUCCESS; | |
1da177e4 LT |
323 | |
324 | /* these three are not supported */ | |
325 | case COPY_ABORTED: | |
326 | case VOLUME_OVERFLOW: | |
327 | case MISCOMPARE: | |
328 | return SUCCESS; | |
329 | ||
330 | case MEDIUM_ERROR: | |
fd1b494d LT |
331 | if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */ |
332 | sshdr.asc == 0x13 || /* AMNF DATA FIELD */ | |
333 | sshdr.asc == 0x14) { /* RECORD NOT FOUND */ | |
334 | return SUCCESS; | |
335 | } | |
1da177e4 LT |
336 | return NEEDS_RETRY; |
337 | ||
338 | case HARDWARE_ERROR: | |
339 | if (scmd->device->retry_hwerror) | |
bb0003c1 | 340 | return ADD_TO_MLQUEUE; |
1da177e4 LT |
341 | else |
342 | return SUCCESS; | |
343 | ||
344 | case ILLEGAL_REQUEST: | |
345 | case BLANK_CHECK: | |
346 | case DATA_PROTECT: | |
347 | default: | |
348 | return SUCCESS; | |
349 | } | |
350 | } | |
351 | ||
4a84067d VD |
352 | static void scsi_handle_queue_ramp_up(struct scsi_device *sdev) |
353 | { | |
354 | struct scsi_host_template *sht = sdev->host->hostt; | |
355 | struct scsi_device *tmp_sdev; | |
356 | ||
357 | if (!sht->change_queue_depth || | |
358 | sdev->queue_depth >= sdev->max_queue_depth) | |
359 | return; | |
360 | ||
361 | if (time_before(jiffies, | |
362 | sdev->last_queue_ramp_up + sdev->queue_ramp_up_period)) | |
363 | return; | |
364 | ||
365 | if (time_before(jiffies, | |
366 | sdev->last_queue_full_time + sdev->queue_ramp_up_period)) | |
367 | return; | |
368 | ||
369 | /* | |
370 | * Walk all devices of a target and do | |
371 | * ramp up on them. | |
372 | */ | |
373 | shost_for_each_device(tmp_sdev, sdev->host) { | |
374 | if (tmp_sdev->channel != sdev->channel || | |
375 | tmp_sdev->id != sdev->id || | |
376 | tmp_sdev->queue_depth == sdev->max_queue_depth) | |
377 | continue; | |
378 | /* | |
379 | * call back into LLD to increase queue_depth by one | |
380 | * with ramp up reason code. | |
381 | */ | |
382 | sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1, | |
383 | SCSI_QDEPTH_RAMP_UP); | |
384 | sdev->last_queue_ramp_up = jiffies; | |
385 | } | |
386 | } | |
387 | ||
42a6a918 MC |
388 | static void scsi_handle_queue_full(struct scsi_device *sdev) |
389 | { | |
390 | struct scsi_host_template *sht = sdev->host->hostt; | |
391 | struct scsi_device *tmp_sdev; | |
392 | ||
393 | if (!sht->change_queue_depth) | |
394 | return; | |
395 | ||
396 | shost_for_each_device(tmp_sdev, sdev->host) { | |
397 | if (tmp_sdev->channel != sdev->channel || | |
398 | tmp_sdev->id != sdev->id) | |
399 | continue; | |
400 | /* | |
401 | * We do not know the number of commands that were at | |
402 | * the device when we got the queue full so we start | |
403 | * from the highest possible value and work our way down. | |
404 | */ | |
405 | sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth - 1, | |
406 | SCSI_QDEPTH_QFULL); | |
407 | } | |
408 | } | |
409 | ||
1da177e4 LT |
410 | /** |
411 | * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD. | |
412 | * @scmd: SCSI cmd to examine. | |
413 | * | |
414 | * Notes: | |
415 | * This is *only* called when we are examining the status of commands | |
416 | * queued during error recovery. the main difference here is that we | |
417 | * don't allow for the possibility of retries here, and we are a lot | |
418 | * more restrictive about what we consider acceptable. | |
dc8875e1 | 419 | */ |
1da177e4 LT |
420 | static int scsi_eh_completed_normally(struct scsi_cmnd *scmd) |
421 | { | |
422 | /* | |
423 | * first check the host byte, to see if there is anything in there | |
424 | * that would indicate what we need to do. | |
425 | */ | |
426 | if (host_byte(scmd->result) == DID_RESET) { | |
427 | /* | |
428 | * rats. we are already in the error handler, so we now | |
429 | * get to try and figure out what to do next. if the sense | |
430 | * is valid, we have a pretty good idea of what to do. | |
431 | * if not, we mark it as FAILED. | |
432 | */ | |
433 | return scsi_check_sense(scmd); | |
434 | } | |
435 | if (host_byte(scmd->result) != DID_OK) | |
436 | return FAILED; | |
437 | ||
438 | /* | |
439 | * next, check the message byte. | |
440 | */ | |
441 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
442 | return FAILED; | |
443 | ||
444 | /* | |
445 | * now, check the status byte to see if this indicates | |
446 | * anything special. | |
447 | */ | |
448 | switch (status_byte(scmd->result)) { | |
449 | case GOOD: | |
4a84067d | 450 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 LT |
451 | case COMMAND_TERMINATED: |
452 | return SUCCESS; | |
453 | case CHECK_CONDITION: | |
454 | return scsi_check_sense(scmd); | |
455 | case CONDITION_GOOD: | |
456 | case INTERMEDIATE_GOOD: | |
457 | case INTERMEDIATE_C_GOOD: | |
458 | /* | |
459 | * who knows? FIXME(eric) | |
460 | */ | |
461 | return SUCCESS; | |
5f91bb05 MR |
462 | case RESERVATION_CONFLICT: |
463 | /* | |
464 | * let issuer deal with this, it could be just fine | |
465 | */ | |
466 | return SUCCESS; | |
1da177e4 | 467 | case QUEUE_FULL: |
42a6a918 MC |
468 | scsi_handle_queue_full(scmd->device); |
469 | /* fall through */ | |
470 | case BUSY: | |
1da177e4 LT |
471 | default: |
472 | return FAILED; | |
473 | } | |
474 | return FAILED; | |
475 | } | |
476 | ||
1da177e4 LT |
477 | /** |
478 | * scsi_eh_done - Completion function for error handling. | |
479 | * @scmd: Cmd that is done. | |
dc8875e1 | 480 | */ |
1da177e4 LT |
481 | static void scsi_eh_done(struct scsi_cmnd *scmd) |
482 | { | |
85631672 MR |
483 | struct completion *eh_action; |
484 | ||
7dfdc9a5 CH |
485 | SCSI_LOG_ERROR_RECOVERY(3, |
486 | printk("%s scmd: %p result: %x\n", | |
cadbd4a5 | 487 | __func__, scmd, scmd->result)); |
85631672 MR |
488 | |
489 | eh_action = scmd->device->host->eh_action; | |
490 | if (eh_action) | |
491 | complete(eh_action); | |
1da177e4 LT |
492 | } |
493 | ||
292148f8 BK |
494 | /** |
495 | * scsi_try_host_reset - ask host adapter to reset itself | |
496 | * @scmd: SCSI cmd to send hsot reset. | |
dc8875e1 | 497 | */ |
292148f8 BK |
498 | static int scsi_try_host_reset(struct scsi_cmnd *scmd) |
499 | { | |
500 | unsigned long flags; | |
501 | int rtn; | |
502 | ||
503 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Host RST\n", | |
cadbd4a5 | 504 | __func__)); |
292148f8 BK |
505 | |
506 | if (!scmd->device->host->hostt->eh_host_reset_handler) | |
507 | return FAILED; | |
508 | ||
509 | rtn = scmd->device->host->hostt->eh_host_reset_handler(scmd); | |
510 | ||
511 | if (rtn == SUCCESS) { | |
512 | if (!scmd->device->host->hostt->skip_settle_delay) | |
513 | ssleep(HOST_RESET_SETTLE_TIME); | |
514 | spin_lock_irqsave(scmd->device->host->host_lock, flags); | |
515 | scsi_report_bus_reset(scmd->device->host, | |
516 | scmd_channel(scmd)); | |
517 | spin_unlock_irqrestore(scmd->device->host->host_lock, flags); | |
518 | } | |
519 | ||
520 | return rtn; | |
521 | } | |
522 | ||
523 | /** | |
524 | * scsi_try_bus_reset - ask host to perform a bus reset | |
525 | * @scmd: SCSI cmd to send bus reset. | |
dc8875e1 | 526 | */ |
292148f8 BK |
527 | static int scsi_try_bus_reset(struct scsi_cmnd *scmd) |
528 | { | |
529 | unsigned long flags; | |
530 | int rtn; | |
531 | ||
532 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Bus RST\n", | |
cadbd4a5 | 533 | __func__)); |
292148f8 BK |
534 | |
535 | if (!scmd->device->host->hostt->eh_bus_reset_handler) | |
536 | return FAILED; | |
537 | ||
538 | rtn = scmd->device->host->hostt->eh_bus_reset_handler(scmd); | |
539 | ||
540 | if (rtn == SUCCESS) { | |
541 | if (!scmd->device->host->hostt->skip_settle_delay) | |
542 | ssleep(BUS_RESET_SETTLE_TIME); | |
543 | spin_lock_irqsave(scmd->device->host->host_lock, flags); | |
544 | scsi_report_bus_reset(scmd->device->host, | |
545 | scmd_channel(scmd)); | |
546 | spin_unlock_irqrestore(scmd->device->host->host_lock, flags); | |
547 | } | |
548 | ||
549 | return rtn; | |
550 | } | |
551 | ||
30bd7df8 MC |
552 | static void __scsi_report_device_reset(struct scsi_device *sdev, void *data) |
553 | { | |
554 | sdev->was_reset = 1; | |
555 | sdev->expecting_cc_ua = 1; | |
556 | } | |
557 | ||
558 | /** | |
559 | * scsi_try_target_reset - Ask host to perform a target reset | |
560 | * @scmd: SCSI cmd used to send a target reset | |
561 | * | |
562 | * Notes: | |
563 | * There is no timeout for this operation. if this operation is | |
564 | * unreliable for a given host, then the host itself needs to put a | |
565 | * timer on it, and set the host back to a consistent state prior to | |
566 | * returning. | |
567 | */ | |
568 | static int scsi_try_target_reset(struct scsi_cmnd *scmd) | |
569 | { | |
570 | unsigned long flags; | |
571 | int rtn; | |
572 | ||
573 | if (!scmd->device->host->hostt->eh_target_reset_handler) | |
574 | return FAILED; | |
575 | ||
576 | rtn = scmd->device->host->hostt->eh_target_reset_handler(scmd); | |
577 | if (rtn == SUCCESS) { | |
578 | spin_lock_irqsave(scmd->device->host->host_lock, flags); | |
579 | __starget_for_each_device(scsi_target(scmd->device), NULL, | |
580 | __scsi_report_device_reset); | |
581 | spin_unlock_irqrestore(scmd->device->host->host_lock, flags); | |
582 | } | |
583 | ||
584 | return rtn; | |
585 | } | |
586 | ||
292148f8 BK |
587 | /** |
588 | * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev | |
589 | * @scmd: SCSI cmd used to send BDR | |
590 | * | |
591 | * Notes: | |
592 | * There is no timeout for this operation. if this operation is | |
593 | * unreliable for a given host, then the host itself needs to put a | |
594 | * timer on it, and set the host back to a consistent state prior to | |
595 | * returning. | |
dc8875e1 | 596 | */ |
292148f8 BK |
597 | static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd) |
598 | { | |
599 | int rtn; | |
600 | ||
601 | if (!scmd->device->host->hostt->eh_device_reset_handler) | |
602 | return FAILED; | |
603 | ||
604 | rtn = scmd->device->host->hostt->eh_device_reset_handler(scmd); | |
30bd7df8 MC |
605 | if (rtn == SUCCESS) |
606 | __scsi_report_device_reset(scmd->device, NULL); | |
292148f8 BK |
607 | return rtn; |
608 | } | |
609 | ||
610 | static int __scsi_try_to_abort_cmd(struct scsi_cmnd *scmd) | |
611 | { | |
612 | if (!scmd->device->host->hostt->eh_abort_handler) | |
613 | return FAILED; | |
614 | ||
615 | return scmd->device->host->hostt->eh_abort_handler(scmd); | |
616 | } | |
617 | ||
618 | /** | |
619 | * scsi_try_to_abort_cmd - Ask host to abort a running command. | |
620 | * @scmd: SCSI cmd to abort from Lower Level. | |
621 | * | |
622 | * Notes: | |
623 | * This function will not return until the user's completion function | |
624 | * has been called. there is no timeout on this operation. if the | |
625 | * author of the low-level driver wishes this operation to be timed, | |
626 | * they can provide this facility themselves. helper functions in | |
627 | * scsi_error.c can be supplied to make this easier to do. | |
dc8875e1 | 628 | */ |
292148f8 BK |
629 | static int scsi_try_to_abort_cmd(struct scsi_cmnd *scmd) |
630 | { | |
631 | /* | |
632 | * scsi_done was called just after the command timed out and before | |
633 | * we had a chance to process it. (db) | |
634 | */ | |
635 | if (scmd->serial_number == 0) | |
636 | return SUCCESS; | |
637 | return __scsi_try_to_abort_cmd(scmd); | |
638 | } | |
639 | ||
640 | static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd) | |
641 | { | |
642 | if (__scsi_try_to_abort_cmd(scmd) != SUCCESS) | |
643 | if (scsi_try_bus_device_reset(scmd) != SUCCESS) | |
30bd7df8 MC |
644 | if (scsi_try_target_reset(scmd) != SUCCESS) |
645 | if (scsi_try_bus_reset(scmd) != SUCCESS) | |
646 | scsi_try_host_reset(scmd); | |
292148f8 BK |
647 | } |
648 | ||
1da177e4 | 649 | /** |
e1c23468 | 650 | * scsi_eh_prep_cmnd - Save a scsi command info as part of error recory |
2dc611de | 651 | * @scmd: SCSI command structure to hijack |
e1c23468 | 652 | * @ses: structure to save restore information |
55db6c1b | 653 | * @cmnd: CDB to send. Can be NULL if no new cmnd is needed |
64a87b24 | 654 | * @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB) |
55db6c1b | 655 | * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored) |
2dc611de | 656 | * |
e1c23468 | 657 | * This function is used to save a scsi command information before re-execution |
55db6c1b BH |
658 | * as part of the error recovery process. If @sense_bytes is 0 the command |
659 | * sent must be one that does not transfer any data. If @sense_bytes != 0 | |
660 | * @cmnd is ignored and this functions sets up a REQUEST_SENSE command | |
661 | * and cmnd buffers to read @sense_bytes into @scmd->sense_buffer. | |
dc8875e1 | 662 | */ |
e1c23468 BH |
663 | void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, |
664 | unsigned char *cmnd, int cmnd_size, unsigned sense_bytes) | |
1da177e4 | 665 | { |
f59114b7 | 666 | struct scsi_device *sdev = scmd->device; |
1da177e4 | 667 | |
631c228c CH |
668 | /* |
669 | * We need saved copies of a number of fields - this is because | |
670 | * error handling may need to overwrite these with different values | |
671 | * to run different commands, and once error handling is complete, | |
672 | * we will need to restore these values prior to running the actual | |
673 | * command. | |
674 | */ | |
e1c23468 | 675 | ses->cmd_len = scmd->cmd_len; |
64a87b24 | 676 | ses->cmnd = scmd->cmnd; |
e1c23468 | 677 | ses->data_direction = scmd->sc_data_direction; |
30b0c37b | 678 | ses->sdb = scmd->sdb; |
6f9a35e2 | 679 | ses->next_rq = scmd->request->next_rq; |
e1c23468 | 680 | ses->result = scmd->result; |
12265709 | 681 | ses->underflow = scmd->underflow; |
db007fc5 | 682 | ses->prot_op = scmd->prot_op; |
631c228c | 683 | |
db007fc5 | 684 | scmd->prot_op = SCSI_PROT_NORMAL; |
64a87b24 BH |
685 | scmd->cmnd = ses->eh_cmnd; |
686 | memset(scmd->cmnd, 0, BLK_MAX_CDB); | |
30b0c37b | 687 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
6f9a35e2 | 688 | scmd->request->next_rq = NULL; |
30b0c37b | 689 | |
55db6c1b | 690 | if (sense_bytes) { |
30b0c37b BH |
691 | scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE, |
692 | sense_bytes); | |
e1c23468 | 693 | sg_init_one(&ses->sense_sgl, scmd->sense_buffer, |
30b0c37b BH |
694 | scmd->sdb.length); |
695 | scmd->sdb.table.sgl = &ses->sense_sgl; | |
55db6c1b | 696 | scmd->sc_data_direction = DMA_FROM_DEVICE; |
30b0c37b | 697 | scmd->sdb.table.nents = 1; |
55db6c1b | 698 | scmd->cmnd[0] = REQUEST_SENSE; |
30b0c37b | 699 | scmd->cmnd[4] = scmd->sdb.length; |
55db6c1b | 700 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); |
631c228c | 701 | } else { |
631c228c | 702 | scmd->sc_data_direction = DMA_NONE; |
55db6c1b | 703 | if (cmnd) { |
64a87b24 | 704 | BUG_ON(cmnd_size > BLK_MAX_CDB); |
55db6c1b BH |
705 | memcpy(scmd->cmnd, cmnd, cmnd_size); |
706 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); | |
707 | } | |
631c228c CH |
708 | } |
709 | ||
710 | scmd->underflow = 0; | |
631c228c | 711 | |
55db6c1b | 712 | if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN) |
1da177e4 | 713 | scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) | |
f59114b7 | 714 | (sdev->lun << 5 & 0xe0); |
1da177e4 | 715 | |
631c228c CH |
716 | /* |
717 | * Zero the sense buffer. The scsi spec mandates that any | |
718 | * untransferred sense data should be interpreted as being zero. | |
719 | */ | |
b80ca4f7 | 720 | memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); |
e1c23468 BH |
721 | } |
722 | EXPORT_SYMBOL(scsi_eh_prep_cmnd); | |
723 | ||
724 | /** | |
725 | * scsi_eh_restore_cmnd - Restore a scsi command info as part of error recory | |
726 | * @scmd: SCSI command structure to restore | |
477e608c | 727 | * @ses: saved information from a coresponding call to scsi_eh_prep_cmnd |
e1c23468 | 728 | * |
477e608c | 729 | * Undo any damage done by above scsi_eh_prep_cmnd(). |
dc8875e1 | 730 | */ |
e1c23468 BH |
731 | void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses) |
732 | { | |
733 | /* | |
734 | * Restore original data | |
735 | */ | |
736 | scmd->cmd_len = ses->cmd_len; | |
64a87b24 | 737 | scmd->cmnd = ses->cmnd; |
e1c23468 | 738 | scmd->sc_data_direction = ses->data_direction; |
30b0c37b | 739 | scmd->sdb = ses->sdb; |
6f9a35e2 | 740 | scmd->request->next_rq = ses->next_rq; |
e1c23468 | 741 | scmd->result = ses->result; |
12265709 | 742 | scmd->underflow = ses->underflow; |
db007fc5 | 743 | scmd->prot_op = ses->prot_op; |
e1c23468 BH |
744 | } |
745 | EXPORT_SYMBOL(scsi_eh_restore_cmnd); | |
631c228c | 746 | |
e1c23468 BH |
747 | /** |
748 | * scsi_send_eh_cmnd - submit a scsi command as part of error recory | |
749 | * @scmd: SCSI command structure to hijack | |
750 | * @cmnd: CDB to send | |
751 | * @cmnd_size: size in bytes of @cmnd | |
752 | * @timeout: timeout for this request | |
753 | * @sense_bytes: size of sense data to copy or 0 | |
754 | * | |
755 | * This function is used to send a scsi command down to a target device | |
756 | * as part of the error recovery process. See also scsi_eh_prep_cmnd() above. | |
757 | * | |
758 | * Return value: | |
759 | * SUCCESS or FAILED or NEEDS_RETRY | |
dc8875e1 | 760 | */ |
e1c23468 BH |
761 | static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd, |
762 | int cmnd_size, int timeout, unsigned sense_bytes) | |
763 | { | |
764 | struct scsi_device *sdev = scmd->device; | |
765 | struct Scsi_Host *shost = sdev->host; | |
766 | DECLARE_COMPLETION_ONSTACK(done); | |
767 | unsigned long timeleft; | |
768 | unsigned long flags; | |
769 | struct scsi_eh_save ses; | |
770 | int rtn; | |
771 | ||
772 | scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes); | |
7dfdc9a5 | 773 | shost->eh_action = &done; |
1da177e4 | 774 | |
f59114b7 | 775 | spin_lock_irqsave(shost->host_lock, flags); |
1da177e4 | 776 | scsi_log_send(scmd); |
f59114b7 TH |
777 | shost->hostt->queuecommand(scmd, scsi_eh_done); |
778 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 | 779 | |
7dfdc9a5 | 780 | timeleft = wait_for_completion_timeout(&done, timeout); |
1da177e4 | 781 | |
f59114b7 | 782 | shost->eh_action = NULL; |
1da177e4 | 783 | |
7dfdc9a5 | 784 | scsi_log_completion(scmd, SUCCESS); |
1da177e4 | 785 | |
7dfdc9a5 CH |
786 | SCSI_LOG_ERROR_RECOVERY(3, |
787 | printk("%s: scmd: %p, timeleft: %ld\n", | |
cadbd4a5 | 788 | __func__, scmd, timeleft)); |
1da177e4 LT |
789 | |
790 | /* | |
7dfdc9a5 CH |
791 | * If there is time left scsi_eh_done got called, and we will |
792 | * examine the actual status codes to see whether the command | |
793 | * actually did complete normally, else tell the host to forget | |
794 | * about this command. | |
1da177e4 | 795 | */ |
7dfdc9a5 | 796 | if (timeleft) { |
1da177e4 LT |
797 | rtn = scsi_eh_completed_normally(scmd); |
798 | SCSI_LOG_ERROR_RECOVERY(3, | |
799 | printk("%s: scsi_eh_completed_normally %x\n", | |
cadbd4a5 | 800 | __func__, rtn)); |
7dfdc9a5 | 801 | |
1da177e4 LT |
802 | switch (rtn) { |
803 | case SUCCESS: | |
804 | case NEEDS_RETRY: | |
805 | case FAILED: | |
806 | break; | |
6e883b0e HR |
807 | case ADD_TO_MLQUEUE: |
808 | rtn = NEEDS_RETRY; | |
809 | break; | |
1da177e4 LT |
810 | default: |
811 | rtn = FAILED; | |
812 | break; | |
813 | } | |
7dfdc9a5 | 814 | } else { |
292148f8 | 815 | scsi_abort_eh_cmnd(scmd); |
7dfdc9a5 | 816 | rtn = FAILED; |
1da177e4 LT |
817 | } |
818 | ||
e1c23468 | 819 | scsi_eh_restore_cmnd(scmd, &ses); |
1da177e4 LT |
820 | return rtn; |
821 | } | |
822 | ||
823 | /** | |
824 | * scsi_request_sense - Request sense data from a particular target. | |
825 | * @scmd: SCSI cmd for request sense. | |
826 | * | |
827 | * Notes: | |
828 | * Some hosts automatically obtain this information, others require | |
829 | * that we obtain it on our own. This function will *not* return until | |
830 | * the command either times out, or it completes. | |
dc8875e1 | 831 | */ |
1da177e4 LT |
832 | static int scsi_request_sense(struct scsi_cmnd *scmd) |
833 | { | |
55db6c1b | 834 | return scsi_send_eh_cmnd(scmd, NULL, 0, SENSE_TIMEOUT, ~0); |
1da177e4 LT |
835 | } |
836 | ||
837 | /** | |
838 | * scsi_eh_finish_cmd - Handle a cmd that eh is finished with. | |
839 | * @scmd: Original SCSI cmd that eh has finished. | |
840 | * @done_q: Queue for processed commands. | |
841 | * | |
842 | * Notes: | |
843 | * We don't want to use the normal command completion while we are are | |
844 | * still handling errors - it may cause other commands to be queued, | |
eb44820c | 845 | * and that would disturb what we are doing. Thus we really want to |
1da177e4 LT |
846 | * keep a list of pending commands for final completion, and once we |
847 | * are ready to leave error handling we handle completion for real. | |
dc8875e1 | 848 | */ |
041c5fc3 | 849 | void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q) |
1da177e4 LT |
850 | { |
851 | scmd->device->host->host_failed--; | |
3111b0d1 | 852 | scmd->eh_eflags = 0; |
1da177e4 LT |
853 | list_move_tail(&scmd->eh_entry, done_q); |
854 | } | |
041c5fc3 | 855 | EXPORT_SYMBOL(scsi_eh_finish_cmd); |
1da177e4 LT |
856 | |
857 | /** | |
858 | * scsi_eh_get_sense - Get device sense data. | |
859 | * @work_q: Queue of commands to process. | |
eb44820c | 860 | * @done_q: Queue of processed commands. |
1da177e4 LT |
861 | * |
862 | * Description: | |
863 | * See if we need to request sense information. if so, then get it | |
864 | * now, so we have a better idea of what to do. | |
865 | * | |
866 | * Notes: | |
867 | * This has the unfortunate side effect that if a shost adapter does | |
eb44820c | 868 | * not automatically request sense information, we end up shutting |
1da177e4 LT |
869 | * it down before we request it. |
870 | * | |
871 | * All drivers should request sense information internally these days, | |
872 | * so for now all I have to say is tough noogies if you end up in here. | |
873 | * | |
874 | * XXX: Long term this code should go away, but that needs an audit of | |
875 | * all LLDDs first. | |
dc8875e1 | 876 | */ |
dca84e46 DW |
877 | int scsi_eh_get_sense(struct list_head *work_q, |
878 | struct list_head *done_q) | |
1da177e4 | 879 | { |
937abeaa | 880 | struct scsi_cmnd *scmd, *next; |
1da177e4 LT |
881 | int rtn; |
882 | ||
937abeaa | 883 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 884 | if ((scmd->eh_eflags & SCSI_EH_CANCEL_CMD) || |
1da177e4 LT |
885 | SCSI_SENSE_VALID(scmd)) |
886 | continue; | |
887 | ||
3bf743e7 JG |
888 | SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd, |
889 | "%s: requesting sense\n", | |
890 | current->comm)); | |
1da177e4 LT |
891 | rtn = scsi_request_sense(scmd); |
892 | if (rtn != SUCCESS) | |
893 | continue; | |
894 | ||
895 | SCSI_LOG_ERROR_RECOVERY(3, printk("sense requested for %p" | |
896 | " result %x\n", scmd, | |
897 | scmd->result)); | |
898 | SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense("bh", scmd)); | |
899 | ||
900 | rtn = scsi_decide_disposition(scmd); | |
901 | ||
902 | /* | |
903 | * if the result was normal, then just pass it along to the | |
904 | * upper level. | |
905 | */ | |
906 | if (rtn == SUCCESS) | |
907 | /* we don't want this command reissued, just | |
908 | * finished with the sense data, so set | |
909 | * retries to the max allowed to ensure it | |
910 | * won't get reissued */ | |
911 | scmd->retries = scmd->allowed; | |
912 | else if (rtn != NEEDS_RETRY) | |
913 | continue; | |
914 | ||
915 | scsi_eh_finish_cmd(scmd, done_q); | |
916 | } | |
917 | ||
918 | return list_empty(work_q); | |
919 | } | |
dca84e46 | 920 | EXPORT_SYMBOL_GPL(scsi_eh_get_sense); |
1da177e4 | 921 | |
1da177e4 LT |
922 | /** |
923 | * scsi_eh_tur - Send TUR to device. | |
eb44820c | 924 | * @scmd: &scsi_cmnd to send TUR |
1da177e4 LT |
925 | * |
926 | * Return value: | |
927 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 928 | */ |
1da177e4 LT |
929 | static int scsi_eh_tur(struct scsi_cmnd *scmd) |
930 | { | |
931 | static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0}; | |
932 | int retry_cnt = 1, rtn; | |
933 | ||
934 | retry_tur: | |
0db99e33 | 935 | rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, SENSE_TIMEOUT, 0); |
1da177e4 | 936 | |
1da177e4 | 937 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd %p rtn %x\n", |
cadbd4a5 | 938 | __func__, scmd, rtn)); |
631c228c CH |
939 | |
940 | switch (rtn) { | |
941 | case NEEDS_RETRY: | |
1da177e4 LT |
942 | if (retry_cnt--) |
943 | goto retry_tur; | |
631c228c CH |
944 | /*FALLTHRU*/ |
945 | case SUCCESS: | |
e47373ec | 946 | return 0; |
631c228c CH |
947 | default: |
948 | return 1; | |
e47373ec | 949 | } |
1da177e4 LT |
950 | } |
951 | ||
952 | /** | |
eb44820c RL |
953 | * scsi_eh_abort_cmds - abort pending commands. |
954 | * @work_q: &list_head for pending commands. | |
955 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
956 | * |
957 | * Decription: | |
958 | * Try and see whether or not it makes sense to try and abort the | |
eb44820c RL |
959 | * running command. This only works out to be the case if we have one |
960 | * command that has timed out. If the command simply failed, it makes | |
1da177e4 LT |
961 | * no sense to try and abort the command, since as far as the shost |
962 | * adapter is concerned, it isn't running. | |
dc8875e1 | 963 | */ |
1da177e4 LT |
964 | static int scsi_eh_abort_cmds(struct list_head *work_q, |
965 | struct list_head *done_q) | |
966 | { | |
937abeaa | 967 | struct scsi_cmnd *scmd, *next; |
1da177e4 LT |
968 | int rtn; |
969 | ||
937abeaa | 970 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 971 | if (!(scmd->eh_eflags & SCSI_EH_CANCEL_CMD)) |
1da177e4 LT |
972 | continue; |
973 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting cmd:" | |
974 | "0x%p\n", current->comm, | |
975 | scmd)); | |
976 | rtn = scsi_try_to_abort_cmd(scmd); | |
2f2eb587 | 977 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
3111b0d1 | 978 | scmd->eh_eflags &= ~SCSI_EH_CANCEL_CMD; |
1da177e4 | 979 | if (!scsi_device_online(scmd->device) || |
2f2eb587 | 980 | rtn == FAST_IO_FAIL || |
1da177e4 LT |
981 | !scsi_eh_tur(scmd)) { |
982 | scsi_eh_finish_cmd(scmd, done_q); | |
983 | } | |
984 | ||
985 | } else | |
986 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting" | |
987 | " cmd failed:" | |
988 | "0x%p\n", | |
989 | current->comm, | |
990 | scmd)); | |
991 | } | |
992 | ||
993 | return list_empty(work_q); | |
994 | } | |
995 | ||
1da177e4 LT |
996 | /** |
997 | * scsi_eh_try_stu - Send START_UNIT to device. | |
eb44820c | 998 | * @scmd: &scsi_cmnd to send START_UNIT |
1da177e4 LT |
999 | * |
1000 | * Return value: | |
1001 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1002 | */ |
1da177e4 LT |
1003 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd) |
1004 | { | |
1005 | static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0}; | |
1da177e4 | 1006 | |
631c228c | 1007 | if (scmd->device->allow_restart) { |
ed773e66 BK |
1008 | int i, rtn = NEEDS_RETRY; |
1009 | ||
1010 | for (i = 0; rtn == NEEDS_RETRY && i < 2; i++) | |
9728c081 | 1011 | rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0); |
1da177e4 | 1012 | |
631c228c CH |
1013 | if (rtn == SUCCESS) |
1014 | return 0; | |
1015 | } | |
1da177e4 | 1016 | |
1da177e4 LT |
1017 | return 1; |
1018 | } | |
1019 | ||
1020 | /** | |
1021 | * scsi_eh_stu - send START_UNIT if needed | |
eb44820c RL |
1022 | * @shost: &scsi host being recovered. |
1023 | * @work_q: &list_head for pending commands. | |
1024 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1025 | * |
1026 | * Notes: | |
1027 | * If commands are failing due to not ready, initializing command required, | |
1028 | * try revalidating the device, which will end up sending a start unit. | |
dc8875e1 | 1029 | */ |
1da177e4 LT |
1030 | static int scsi_eh_stu(struct Scsi_Host *shost, |
1031 | struct list_head *work_q, | |
1032 | struct list_head *done_q) | |
1033 | { | |
937abeaa | 1034 | struct scsi_cmnd *scmd, *stu_scmd, *next; |
1da177e4 LT |
1035 | struct scsi_device *sdev; |
1036 | ||
1037 | shost_for_each_device(sdev, shost) { | |
1038 | stu_scmd = NULL; | |
1039 | list_for_each_entry(scmd, work_q, eh_entry) | |
1040 | if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) && | |
1041 | scsi_check_sense(scmd) == FAILED ) { | |
1042 | stu_scmd = scmd; | |
1043 | break; | |
1044 | } | |
1045 | ||
1046 | if (!stu_scmd) | |
1047 | continue; | |
1048 | ||
1049 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending START_UNIT to sdev:" | |
1050 | " 0x%p\n", current->comm, sdev)); | |
1051 | ||
1052 | if (!scsi_eh_try_stu(stu_scmd)) { | |
1053 | if (!scsi_device_online(sdev) || | |
1054 | !scsi_eh_tur(stu_scmd)) { | |
937abeaa CH |
1055 | list_for_each_entry_safe(scmd, next, |
1056 | work_q, eh_entry) { | |
1da177e4 LT |
1057 | if (scmd->device == sdev) |
1058 | scsi_eh_finish_cmd(scmd, done_q); | |
1059 | } | |
1060 | } | |
1061 | } else { | |
1062 | SCSI_LOG_ERROR_RECOVERY(3, | |
1063 | printk("%s: START_UNIT failed to sdev:" | |
1064 | " 0x%p\n", current->comm, sdev)); | |
1065 | } | |
1066 | } | |
1067 | ||
1068 | return list_empty(work_q); | |
1069 | } | |
1070 | ||
1071 | ||
1072 | /** | |
1073 | * scsi_eh_bus_device_reset - send bdr if needed | |
1074 | * @shost: scsi host being recovered. | |
eb44820c RL |
1075 | * @work_q: &list_head for pending commands. |
1076 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1077 | * |
1078 | * Notes: | |
eb44820c | 1079 | * Try a bus device reset. Still, look to see whether we have multiple |
1da177e4 LT |
1080 | * devices that are jammed or not - if we have multiple devices, it |
1081 | * makes no sense to try bus_device_reset - we really would need to try | |
1082 | * a bus_reset instead. | |
dc8875e1 | 1083 | */ |
1da177e4 LT |
1084 | static int scsi_eh_bus_device_reset(struct Scsi_Host *shost, |
1085 | struct list_head *work_q, | |
1086 | struct list_head *done_q) | |
1087 | { | |
937abeaa | 1088 | struct scsi_cmnd *scmd, *bdr_scmd, *next; |
1da177e4 LT |
1089 | struct scsi_device *sdev; |
1090 | int rtn; | |
1091 | ||
1092 | shost_for_each_device(sdev, shost) { | |
1093 | bdr_scmd = NULL; | |
1094 | list_for_each_entry(scmd, work_q, eh_entry) | |
1095 | if (scmd->device == sdev) { | |
1096 | bdr_scmd = scmd; | |
1097 | break; | |
1098 | } | |
1099 | ||
1100 | if (!bdr_scmd) | |
1101 | continue; | |
1102 | ||
1103 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BDR sdev:" | |
1104 | " 0x%p\n", current->comm, | |
1105 | sdev)); | |
1106 | rtn = scsi_try_bus_device_reset(bdr_scmd); | |
2f2eb587 | 1107 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
1da177e4 | 1108 | if (!scsi_device_online(sdev) || |
2f2eb587 | 1109 | rtn == FAST_IO_FAIL || |
1da177e4 | 1110 | !scsi_eh_tur(bdr_scmd)) { |
937abeaa CH |
1111 | list_for_each_entry_safe(scmd, next, |
1112 | work_q, eh_entry) { | |
1da177e4 LT |
1113 | if (scmd->device == sdev) |
1114 | scsi_eh_finish_cmd(scmd, | |
1115 | done_q); | |
1116 | } | |
1117 | } | |
1118 | } else { | |
1119 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BDR" | |
1120 | " failed sdev:" | |
1121 | "0x%p\n", | |
1122 | current->comm, | |
1123 | sdev)); | |
1124 | } | |
1125 | } | |
1126 | ||
1127 | return list_empty(work_q); | |
1128 | } | |
1129 | ||
30bd7df8 MC |
1130 | /** |
1131 | * scsi_eh_target_reset - send target reset if needed | |
1132 | * @shost: scsi host being recovered. | |
1133 | * @work_q: &list_head for pending commands. | |
1134 | * @done_q: &list_head for processed commands. | |
1135 | * | |
1136 | * Notes: | |
1137 | * Try a target reset. | |
1138 | */ | |
1139 | static int scsi_eh_target_reset(struct Scsi_Host *shost, | |
1140 | struct list_head *work_q, | |
1141 | struct list_head *done_q) | |
1142 | { | |
1143 | struct scsi_cmnd *scmd, *tgtr_scmd, *next; | |
c82dc88d | 1144 | unsigned int id = 0; |
30bd7df8 MC |
1145 | int rtn; |
1146 | ||
c82dc88d | 1147 | do { |
30bd7df8 MC |
1148 | tgtr_scmd = NULL; |
1149 | list_for_each_entry(scmd, work_q, eh_entry) { | |
1150 | if (id == scmd_id(scmd)) { | |
1151 | tgtr_scmd = scmd; | |
1152 | break; | |
1153 | } | |
1154 | } | |
c82dc88d JB |
1155 | if (!tgtr_scmd) { |
1156 | /* not one exactly equal; find the next highest */ | |
1157 | list_for_each_entry(scmd, work_q, eh_entry) { | |
1158 | if (scmd_id(scmd) > id && | |
1159 | (!tgtr_scmd || | |
1160 | scmd_id(tgtr_scmd) > scmd_id(scmd))) | |
1161 | tgtr_scmd = scmd; | |
1162 | } | |
1163 | } | |
30bd7df8 | 1164 | if (!tgtr_scmd) |
c82dc88d JB |
1165 | /* no more commands, that's it */ |
1166 | break; | |
30bd7df8 MC |
1167 | |
1168 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending target reset " | |
1169 | "to target %d\n", | |
1170 | current->comm, id)); | |
1171 | rtn = scsi_try_target_reset(tgtr_scmd); | |
2f2eb587 | 1172 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
30bd7df8 MC |
1173 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1174 | if (id == scmd_id(scmd)) | |
1175 | if (!scsi_device_online(scmd->device) || | |
2f2eb587 | 1176 | rtn == FAST_IO_FAIL || |
30bd7df8 MC |
1177 | !scsi_eh_tur(tgtr_scmd)) |
1178 | scsi_eh_finish_cmd(scmd, | |
1179 | done_q); | |
1180 | } | |
1181 | } else | |
1182 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Target reset" | |
1183 | " failed target: " | |
1184 | "%d\n", | |
1185 | current->comm, id)); | |
c82dc88d JB |
1186 | id++; |
1187 | } while(id != 0); | |
30bd7df8 MC |
1188 | |
1189 | return list_empty(work_q); | |
1190 | } | |
1191 | ||
1da177e4 LT |
1192 | /** |
1193 | * scsi_eh_bus_reset - send a bus reset | |
eb44820c RL |
1194 | * @shost: &scsi host being recovered. |
1195 | * @work_q: &list_head for pending commands. | |
1196 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1197 | */ |
1da177e4 LT |
1198 | static int scsi_eh_bus_reset(struct Scsi_Host *shost, |
1199 | struct list_head *work_q, | |
1200 | struct list_head *done_q) | |
1201 | { | |
937abeaa | 1202 | struct scsi_cmnd *scmd, *chan_scmd, *next; |
1da177e4 LT |
1203 | unsigned int channel; |
1204 | int rtn; | |
1205 | ||
1206 | /* | |
1207 | * we really want to loop over the various channels, and do this on | |
1208 | * a channel by channel basis. we should also check to see if any | |
1209 | * of the failed commands are on soft_reset devices, and if so, skip | |
1210 | * the reset. | |
1211 | */ | |
1212 | ||
1213 | for (channel = 0; channel <= shost->max_channel; channel++) { | |
1214 | chan_scmd = NULL; | |
1215 | list_for_each_entry(scmd, work_q, eh_entry) { | |
422c0d61 | 1216 | if (channel == scmd_channel(scmd)) { |
1da177e4 LT |
1217 | chan_scmd = scmd; |
1218 | break; | |
1219 | /* | |
1220 | * FIXME add back in some support for | |
1221 | * soft_reset devices. | |
1222 | */ | |
1223 | } | |
1224 | } | |
1225 | ||
1226 | if (!chan_scmd) | |
1227 | continue; | |
1228 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BRST chan:" | |
1229 | " %d\n", current->comm, | |
1230 | channel)); | |
1231 | rtn = scsi_try_bus_reset(chan_scmd); | |
2f2eb587 | 1232 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
937abeaa | 1233 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
422c0d61 | 1234 | if (channel == scmd_channel(scmd)) |
1da177e4 | 1235 | if (!scsi_device_online(scmd->device) || |
2f2eb587 | 1236 | rtn == FAST_IO_FAIL || |
1da177e4 LT |
1237 | !scsi_eh_tur(scmd)) |
1238 | scsi_eh_finish_cmd(scmd, | |
1239 | done_q); | |
1240 | } | |
1241 | } else { | |
1242 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BRST" | |
1243 | " failed chan: %d\n", | |
1244 | current->comm, | |
1245 | channel)); | |
1246 | } | |
1247 | } | |
1248 | return list_empty(work_q); | |
1249 | } | |
1250 | ||
1251 | /** | |
1252 | * scsi_eh_host_reset - send a host reset | |
1253 | * @work_q: list_head for processed commands. | |
1254 | * @done_q: list_head for processed commands. | |
dc8875e1 | 1255 | */ |
1da177e4 LT |
1256 | static int scsi_eh_host_reset(struct list_head *work_q, |
1257 | struct list_head *done_q) | |
1258 | { | |
937abeaa | 1259 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1260 | int rtn; |
1da177e4 LT |
1261 | |
1262 | if (!list_empty(work_q)) { | |
1263 | scmd = list_entry(work_q->next, | |
1264 | struct scsi_cmnd, eh_entry); | |
1265 | ||
1266 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending HRST\n" | |
1267 | , current->comm)); | |
1268 | ||
1269 | rtn = scsi_try_host_reset(scmd); | |
2f2eb587 | 1270 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
937abeaa | 1271 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1da177e4 | 1272 | if (!scsi_device_online(scmd->device) || |
2f2eb587 | 1273 | rtn == FAST_IO_FAIL || |
1da177e4 LT |
1274 | (!scsi_eh_try_stu(scmd) && !scsi_eh_tur(scmd)) || |
1275 | !scsi_eh_tur(scmd)) | |
1276 | scsi_eh_finish_cmd(scmd, done_q); | |
1277 | } | |
1278 | } else { | |
1279 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: HRST" | |
1280 | " failed\n", | |
1281 | current->comm)); | |
1282 | } | |
1283 | } | |
1284 | return list_empty(work_q); | |
1285 | } | |
1286 | ||
1287 | /** | |
1288 | * scsi_eh_offline_sdevs - offline scsi devices that fail to recover | |
1289 | * @work_q: list_head for processed commands. | |
1290 | * @done_q: list_head for processed commands. | |
dc8875e1 | 1291 | */ |
1da177e4 LT |
1292 | static void scsi_eh_offline_sdevs(struct list_head *work_q, |
1293 | struct list_head *done_q) | |
1294 | { | |
937abeaa | 1295 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1296 | |
937abeaa | 1297 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
31765d7d MW |
1298 | sdev_printk(KERN_INFO, scmd->device, "Device offlined - " |
1299 | "not ready after error recovery\n"); | |
1da177e4 | 1300 | scsi_device_set_state(scmd->device, SDEV_OFFLINE); |
3111b0d1 | 1301 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) { |
1da177e4 LT |
1302 | /* |
1303 | * FIXME: Handle lost cmds. | |
1304 | */ | |
1305 | } | |
1306 | scsi_eh_finish_cmd(scmd, done_q); | |
1307 | } | |
1308 | return; | |
1309 | } | |
1310 | ||
4a27446f MC |
1311 | /** |
1312 | * scsi_noretry_cmd - determinte if command should be failed fast | |
1313 | * @scmd: SCSI cmd to examine. | |
1314 | */ | |
1315 | int scsi_noretry_cmd(struct scsi_cmnd *scmd) | |
1316 | { | |
1317 | switch (host_byte(scmd->result)) { | |
1318 | case DID_OK: | |
1319 | break; | |
1320 | case DID_BUS_BUSY: | |
1321 | return blk_failfast_transport(scmd->request); | |
1322 | case DID_PARITY: | |
1323 | return blk_failfast_dev(scmd->request); | |
1324 | case DID_ERROR: | |
1325 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1326 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1327 | return 0; | |
1328 | /* fall through */ | |
1329 | case DID_SOFT_ERROR: | |
1330 | return blk_failfast_driver(scmd->request); | |
1331 | } | |
1332 | ||
1333 | switch (status_byte(scmd->result)) { | |
1334 | case CHECK_CONDITION: | |
1335 | /* | |
1336 | * assume caller has checked sense and determinted | |
1337 | * the check condition was retryable. | |
1338 | */ | |
1339 | return blk_failfast_dev(scmd->request); | |
1340 | } | |
1341 | ||
1342 | return 0; | |
1343 | } | |
1344 | ||
1da177e4 LT |
1345 | /** |
1346 | * scsi_decide_disposition - Disposition a cmd on return from LLD. | |
1347 | * @scmd: SCSI cmd to examine. | |
1348 | * | |
1349 | * Notes: | |
1350 | * This is *only* called when we are examining the status after sending | |
1351 | * out the actual data command. any commands that are queued for error | |
1352 | * recovery (e.g. test_unit_ready) do *not* come through here. | |
1353 | * | |
1354 | * When this routine returns failed, it means the error handler thread | |
1355 | * is woken. In cases where the error code indicates an error that | |
1356 | * doesn't require the error handler read (i.e. we don't need to | |
1357 | * abort/reset), this function should return SUCCESS. | |
dc8875e1 | 1358 | */ |
1da177e4 LT |
1359 | int scsi_decide_disposition(struct scsi_cmnd *scmd) |
1360 | { | |
1361 | int rtn; | |
1362 | ||
1363 | /* | |
1364 | * if the device is offline, then we clearly just pass the result back | |
1365 | * up to the top level. | |
1366 | */ | |
1367 | if (!scsi_device_online(scmd->device)) { | |
1368 | SCSI_LOG_ERROR_RECOVERY(5, printk("%s: device offline - report" | |
1369 | " as SUCCESS\n", | |
cadbd4a5 | 1370 | __func__)); |
1da177e4 LT |
1371 | return SUCCESS; |
1372 | } | |
1373 | ||
1374 | /* | |
1375 | * first check the host byte, to see if there is anything in there | |
1376 | * that would indicate what we need to do. | |
1377 | */ | |
1378 | switch (host_byte(scmd->result)) { | |
1379 | case DID_PASSTHROUGH: | |
1380 | /* | |
1381 | * no matter what, pass this through to the upper layer. | |
1382 | * nuke this special code so that it looks like we are saying | |
1383 | * did_ok. | |
1384 | */ | |
1385 | scmd->result &= 0xff00ffff; | |
1386 | return SUCCESS; | |
1387 | case DID_OK: | |
1388 | /* | |
1389 | * looks good. drop through, and check the next byte. | |
1390 | */ | |
1391 | break; | |
1392 | case DID_NO_CONNECT: | |
1393 | case DID_BAD_TARGET: | |
1394 | case DID_ABORT: | |
1395 | /* | |
1396 | * note - this means that we just report the status back | |
1397 | * to the top level driver, not that we actually think | |
1398 | * that it indicates SUCCESS. | |
1399 | */ | |
1400 | return SUCCESS; | |
1401 | /* | |
1402 | * when the low level driver returns did_soft_error, | |
1403 | * it is responsible for keeping an internal retry counter | |
1404 | * in order to avoid endless loops (db) | |
1405 | * | |
1406 | * actually this is a bug in this function here. we should | |
1407 | * be mindful of the maximum number of retries specified | |
1408 | * and not get stuck in a loop. | |
1409 | */ | |
1410 | case DID_SOFT_ERROR: | |
1411 | goto maybe_retry; | |
1412 | case DID_IMM_RETRY: | |
1413 | return NEEDS_RETRY; | |
1414 | ||
bf341919 JB |
1415 | case DID_REQUEUE: |
1416 | return ADD_TO_MLQUEUE; | |
a4dfaa6f MC |
1417 | case DID_TRANSPORT_DISRUPTED: |
1418 | /* | |
1419 | * LLD/transport was disrupted during processing of the IO. | |
1420 | * The transport class is now blocked/blocking, | |
1421 | * and the transport will decide what to do with the IO | |
939c2288 MC |
1422 | * based on its timers and recovery capablilities if |
1423 | * there are enough retries. | |
a4dfaa6f | 1424 | */ |
939c2288 | 1425 | goto maybe_retry; |
a4dfaa6f MC |
1426 | case DID_TRANSPORT_FAILFAST: |
1427 | /* | |
1428 | * The transport decided to failfast the IO (most likely | |
1429 | * the fast io fail tmo fired), so send IO directly upwards. | |
1430 | */ | |
1431 | return SUCCESS; | |
1da177e4 LT |
1432 | case DID_ERROR: |
1433 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1434 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1435 | /* | |
1436 | * execute reservation conflict processing code | |
1437 | * lower down | |
1438 | */ | |
1439 | break; | |
1440 | /* fallthrough */ | |
1441 | ||
1442 | case DID_BUS_BUSY: | |
1443 | case DID_PARITY: | |
1444 | goto maybe_retry; | |
1445 | case DID_TIME_OUT: | |
1446 | /* | |
1447 | * when we scan the bus, we get timeout messages for | |
1448 | * these commands if there is no device available. | |
1449 | * other hosts report did_no_connect for the same thing. | |
1450 | */ | |
1451 | if ((scmd->cmnd[0] == TEST_UNIT_READY || | |
1452 | scmd->cmnd[0] == INQUIRY)) { | |
1453 | return SUCCESS; | |
1454 | } else { | |
1455 | return FAILED; | |
1456 | } | |
1457 | case DID_RESET: | |
1458 | return SUCCESS; | |
1459 | default: | |
1460 | return FAILED; | |
1461 | } | |
1462 | ||
1463 | /* | |
1464 | * next, check the message byte. | |
1465 | */ | |
1466 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
1467 | return FAILED; | |
1468 | ||
1469 | /* | |
1470 | * check the status byte to see if this indicates anything special. | |
1471 | */ | |
1472 | switch (status_byte(scmd->result)) { | |
1473 | case QUEUE_FULL: | |
42a6a918 | 1474 | scsi_handle_queue_full(scmd->device); |
1da177e4 LT |
1475 | /* |
1476 | * the case of trying to send too many commands to a | |
1477 | * tagged queueing device. | |
1478 | */ | |
1479 | case BUSY: | |
1480 | /* | |
1481 | * device can't talk to us at the moment. Should only | |
1482 | * occur (SAM-3) when the task queue is empty, so will cause | |
1483 | * the empty queue handling to trigger a stall in the | |
1484 | * device. | |
1485 | */ | |
1486 | return ADD_TO_MLQUEUE; | |
1487 | case GOOD: | |
4a84067d | 1488 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 | 1489 | case COMMAND_TERMINATED: |
1da177e4 | 1490 | return SUCCESS; |
a9b589d9 VB |
1491 | case TASK_ABORTED: |
1492 | goto maybe_retry; | |
1da177e4 LT |
1493 | case CHECK_CONDITION: |
1494 | rtn = scsi_check_sense(scmd); | |
1495 | if (rtn == NEEDS_RETRY) | |
1496 | goto maybe_retry; | |
1497 | /* if rtn == FAILED, we have no sense information; | |
1498 | * returning FAILED will wake the error handler thread | |
1499 | * to collect the sense and redo the decide | |
1500 | * disposition */ | |
1501 | return rtn; | |
1502 | case CONDITION_GOOD: | |
1503 | case INTERMEDIATE_GOOD: | |
1504 | case INTERMEDIATE_C_GOOD: | |
1505 | case ACA_ACTIVE: | |
1506 | /* | |
1507 | * who knows? FIXME(eric) | |
1508 | */ | |
1509 | return SUCCESS; | |
1510 | ||
1511 | case RESERVATION_CONFLICT: | |
9ccfc756 JB |
1512 | sdev_printk(KERN_INFO, scmd->device, |
1513 | "reservation conflict\n"); | |
1da177e4 LT |
1514 | return SUCCESS; /* causes immediate i/o error */ |
1515 | default: | |
1516 | return FAILED; | |
1517 | } | |
1518 | return FAILED; | |
1519 | ||
1520 | maybe_retry: | |
1521 | ||
1522 | /* we requeue for retry because the error was retryable, and | |
1523 | * the request was not marked fast fail. Note that above, | |
1524 | * even if the request is marked fast fail, we still requeue | |
1525 | * for queue congestion conditions (QUEUE_FULL or BUSY) */ | |
8884efab | 1526 | if ((++scmd->retries) <= scmd->allowed |
4a27446f | 1527 | && !scsi_noretry_cmd(scmd)) { |
1da177e4 LT |
1528 | return NEEDS_RETRY; |
1529 | } else { | |
1530 | /* | |
1531 | * no more retries - report this one back to upper level. | |
1532 | */ | |
1533 | return SUCCESS; | |
1534 | } | |
1535 | } | |
1536 | ||
f078727b FT |
1537 | static void eh_lock_door_done(struct request *req, int uptodate) |
1538 | { | |
1539 | __blk_put_request(req->q, req); | |
1540 | } | |
1541 | ||
1da177e4 LT |
1542 | /** |
1543 | * scsi_eh_lock_door - Prevent medium removal for the specified device | |
1544 | * @sdev: SCSI device to prevent medium removal | |
1545 | * | |
1546 | * Locking: | |
91bc31fb | 1547 | * We must be called from process context. |
1da177e4 LT |
1548 | * |
1549 | * Notes: | |
1550 | * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the | |
1551 | * head of the devices request queue, and continue. | |
dc8875e1 | 1552 | */ |
1da177e4 LT |
1553 | static void scsi_eh_lock_door(struct scsi_device *sdev) |
1554 | { | |
f078727b | 1555 | struct request *req; |
1da177e4 | 1556 | |
91bc31fb JB |
1557 | /* |
1558 | * blk_get_request with GFP_KERNEL (__GFP_WAIT) sleeps until a | |
1559 | * request becomes available | |
1560 | */ | |
f078727b | 1561 | req = blk_get_request(sdev->request_queue, READ, GFP_KERNEL); |
1da177e4 | 1562 | |
f078727b FT |
1563 | req->cmd[0] = ALLOW_MEDIUM_REMOVAL; |
1564 | req->cmd[1] = 0; | |
1565 | req->cmd[2] = 0; | |
1566 | req->cmd[3] = 0; | |
1567 | req->cmd[4] = SCSI_REMOVAL_PREVENT; | |
1568 | req->cmd[5] = 0; | |
1da177e4 | 1569 | |
f078727b FT |
1570 | req->cmd_len = COMMAND_SIZE(req->cmd[0]); |
1571 | ||
1572 | req->cmd_type = REQ_TYPE_BLOCK_PC; | |
1573 | req->cmd_flags |= REQ_QUIET; | |
1574 | req->timeout = 10 * HZ; | |
1575 | req->retries = 5; | |
1576 | ||
1577 | blk_execute_rq_nowait(req->q, NULL, req, 1, eh_lock_door_done); | |
1578 | } | |
1da177e4 LT |
1579 | |
1580 | /** | |
1581 | * scsi_restart_operations - restart io operations to the specified host. | |
1582 | * @shost: Host we are restarting. | |
1583 | * | |
1584 | * Notes: | |
1585 | * When we entered the error handler, we blocked all further i/o to | |
1586 | * this device. we need to 'reverse' this process. | |
dc8875e1 | 1587 | */ |
1da177e4 LT |
1588 | static void scsi_restart_operations(struct Scsi_Host *shost) |
1589 | { | |
1590 | struct scsi_device *sdev; | |
939647ee | 1591 | unsigned long flags; |
1da177e4 LT |
1592 | |
1593 | /* | |
1594 | * If the door was locked, we need to insert a door lock request | |
1595 | * onto the head of the SCSI request queue for the device. There | |
1596 | * is no point trying to lock the door of an off-line device. | |
1597 | */ | |
1598 | shost_for_each_device(sdev, shost) { | |
1599 | if (scsi_device_online(sdev) && sdev->locked) | |
1600 | scsi_eh_lock_door(sdev); | |
1601 | } | |
1602 | ||
1603 | /* | |
1604 | * next free up anything directly waiting upon the host. this | |
1605 | * will be requests for character device operations, and also for | |
1606 | * ioctls to queued block devices. | |
1607 | */ | |
1608 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: waking up host to restart\n", | |
cadbd4a5 | 1609 | __func__)); |
1da177e4 | 1610 | |
939647ee JB |
1611 | spin_lock_irqsave(shost->host_lock, flags); |
1612 | if (scsi_host_set_state(shost, SHOST_RUNNING)) | |
1613 | if (scsi_host_set_state(shost, SHOST_CANCEL)) | |
1614 | BUG_ON(scsi_host_set_state(shost, SHOST_DEL)); | |
1615 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
1616 | |
1617 | wake_up(&shost->host_wait); | |
1618 | ||
1619 | /* | |
1620 | * finally we need to re-initiate requests that may be pending. we will | |
1621 | * have had everything blocked while error handling is taking place, and | |
1622 | * now that error recovery is done, we will need to ensure that these | |
1623 | * requests are started. | |
1624 | */ | |
1625 | scsi_run_host_queues(shost); | |
1626 | } | |
1627 | ||
1628 | /** | |
1629 | * scsi_eh_ready_devs - check device ready state and recover if not. | |
1630 | * @shost: host to be recovered. | |
eb44820c RL |
1631 | * @work_q: &list_head for pending commands. |
1632 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1633 | */ |
dca84e46 DW |
1634 | void scsi_eh_ready_devs(struct Scsi_Host *shost, |
1635 | struct list_head *work_q, | |
1636 | struct list_head *done_q) | |
1da177e4 LT |
1637 | { |
1638 | if (!scsi_eh_stu(shost, work_q, done_q)) | |
1639 | if (!scsi_eh_bus_device_reset(shost, work_q, done_q)) | |
30bd7df8 MC |
1640 | if (!scsi_eh_target_reset(shost, work_q, done_q)) |
1641 | if (!scsi_eh_bus_reset(shost, work_q, done_q)) | |
1642 | if (!scsi_eh_host_reset(work_q, done_q)) | |
1643 | scsi_eh_offline_sdevs(work_q, | |
1644 | done_q); | |
1da177e4 | 1645 | } |
dca84e46 | 1646 | EXPORT_SYMBOL_GPL(scsi_eh_ready_devs); |
1da177e4 LT |
1647 | |
1648 | /** | |
1649 | * scsi_eh_flush_done_q - finish processed commands or retry them. | |
1650 | * @done_q: list_head of processed commands. | |
dc8875e1 | 1651 | */ |
041c5fc3 | 1652 | void scsi_eh_flush_done_q(struct list_head *done_q) |
1da177e4 | 1653 | { |
937abeaa | 1654 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1655 | |
937abeaa CH |
1656 | list_for_each_entry_safe(scmd, next, done_q, eh_entry) { |
1657 | list_del_init(&scmd->eh_entry); | |
1da177e4 | 1658 | if (scsi_device_online(scmd->device) && |
4a27446f | 1659 | !scsi_noretry_cmd(scmd) && |
8884efab | 1660 | (++scmd->retries <= scmd->allowed)) { |
1da177e4 LT |
1661 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush" |
1662 | " retry cmd: %p\n", | |
1663 | current->comm, | |
1664 | scmd)); | |
1665 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); | |
1666 | } else { | |
793698ce PM |
1667 | /* |
1668 | * If just we got sense for the device (called | |
1669 | * scsi_eh_get_sense), scmd->result is already | |
1670 | * set, do not set DRIVER_TIMEOUT. | |
1671 | */ | |
1da177e4 LT |
1672 | if (!scmd->result) |
1673 | scmd->result |= (DRIVER_TIMEOUT << 24); | |
1674 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush finish" | |
1675 | " cmd: %p\n", | |
1676 | current->comm, scmd)); | |
1677 | scsi_finish_command(scmd); | |
1678 | } | |
1679 | } | |
1680 | } | |
041c5fc3 | 1681 | EXPORT_SYMBOL(scsi_eh_flush_done_q); |
1da177e4 LT |
1682 | |
1683 | /** | |
1684 | * scsi_unjam_host - Attempt to fix a host which has a cmd that failed. | |
1685 | * @shost: Host to unjam. | |
1686 | * | |
1687 | * Notes: | |
1688 | * When we come in here, we *know* that all commands on the bus have | |
1689 | * either completed, failed or timed out. we also know that no further | |
1690 | * commands are being sent to the host, so things are relatively quiet | |
1691 | * and we have freedom to fiddle with things as we wish. | |
1692 | * | |
1693 | * This is only the *default* implementation. it is possible for | |
1694 | * individual drivers to supply their own version of this function, and | |
1695 | * if the maintainer wishes to do this, it is strongly suggested that | |
1696 | * this function be taken as a template and modified. this function | |
1697 | * was designed to correctly handle problems for about 95% of the | |
1698 | * different cases out there, and it should always provide at least a | |
1699 | * reasonable amount of error recovery. | |
1700 | * | |
1701 | * Any command marked 'failed' or 'timeout' must eventually have | |
1702 | * scsi_finish_cmd() called for it. we do all of the retry stuff | |
1703 | * here, so when we restart the host after we return it should have an | |
1704 | * empty queue. | |
dc8875e1 | 1705 | */ |
1da177e4 LT |
1706 | static void scsi_unjam_host(struct Scsi_Host *shost) |
1707 | { | |
1708 | unsigned long flags; | |
1709 | LIST_HEAD(eh_work_q); | |
1710 | LIST_HEAD(eh_done_q); | |
1711 | ||
1712 | spin_lock_irqsave(shost->host_lock, flags); | |
1713 | list_splice_init(&shost->eh_cmd_q, &eh_work_q); | |
1714 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1715 | ||
1716 | SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost, &eh_work_q)); | |
1717 | ||
1718 | if (!scsi_eh_get_sense(&eh_work_q, &eh_done_q)) | |
1719 | if (!scsi_eh_abort_cmds(&eh_work_q, &eh_done_q)) | |
1720 | scsi_eh_ready_devs(shost, &eh_work_q, &eh_done_q); | |
1721 | ||
1722 | scsi_eh_flush_done_q(&eh_done_q); | |
1723 | } | |
1724 | ||
1725 | /** | |
ad42eb1b | 1726 | * scsi_error_handler - SCSI error handler thread |
1da177e4 LT |
1727 | * @data: Host for which we are running. |
1728 | * | |
1729 | * Notes: | |
ad42eb1b CH |
1730 | * This is the main error handling loop. This is run as a kernel thread |
1731 | * for every SCSI host and handles all error handling activity. | |
dc8875e1 | 1732 | */ |
1da177e4 LT |
1733 | int scsi_error_handler(void *data) |
1734 | { | |
ad42eb1b | 1735 | struct Scsi_Host *shost = data; |
1da177e4 | 1736 | |
1da177e4 | 1737 | /* |
ad42eb1b CH |
1738 | * We use TASK_INTERRUPTIBLE so that the thread is not |
1739 | * counted against the load average as a running process. | |
1740 | * We never actually get interrupted because kthread_run | |
c03264a7 | 1741 | * disables signal delivery for the created thread. |
1da177e4 | 1742 | */ |
3ed7a470 JB |
1743 | set_current_state(TASK_INTERRUPTIBLE); |
1744 | while (!kthread_should_stop()) { | |
ee7863bc | 1745 | if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) || |
3ed7a470 | 1746 | shost->host_failed != shost->host_busy) { |
ad42eb1b CH |
1747 | SCSI_LOG_ERROR_RECOVERY(1, |
1748 | printk("Error handler scsi_eh_%d sleeping\n", | |
1749 | shost->host_no)); | |
3ed7a470 JB |
1750 | schedule(); |
1751 | set_current_state(TASK_INTERRUPTIBLE); | |
1752 | continue; | |
1753 | } | |
1da177e4 | 1754 | |
3ed7a470 | 1755 | __set_current_state(TASK_RUNNING); |
ad42eb1b CH |
1756 | SCSI_LOG_ERROR_RECOVERY(1, |
1757 | printk("Error handler scsi_eh_%d waking up\n", | |
1758 | shost->host_no)); | |
1da177e4 | 1759 | |
1da177e4 LT |
1760 | /* |
1761 | * We have a host that is failing for some reason. Figure out | |
1762 | * what we need to do to get it up and online again (if we can). | |
1763 | * If we fail, we end up taking the thing offline. | |
1764 | */ | |
9227c33d CH |
1765 | if (shost->transportt->eh_strategy_handler) |
1766 | shost->transportt->eh_strategy_handler(shost); | |
1da177e4 LT |
1767 | else |
1768 | scsi_unjam_host(shost); | |
1769 | ||
1da177e4 LT |
1770 | /* |
1771 | * Note - if the above fails completely, the action is to take | |
1772 | * individual devices offline and flush the queue of any | |
1773 | * outstanding requests that may have been pending. When we | |
1774 | * restart, we restart any I/O to any other devices on the bus | |
1775 | * which are still online. | |
1776 | */ | |
1777 | scsi_restart_operations(shost); | |
3ed7a470 | 1778 | set_current_state(TASK_INTERRUPTIBLE); |
1da177e4 | 1779 | } |
461a0ffb SR |
1780 | __set_current_state(TASK_RUNNING); |
1781 | ||
ad42eb1b CH |
1782 | SCSI_LOG_ERROR_RECOVERY(1, |
1783 | printk("Error handler scsi_eh_%d exiting\n", shost->host_no)); | |
3ed7a470 | 1784 | shost->ehandler = NULL; |
1da177e4 LT |
1785 | return 0; |
1786 | } | |
1787 | ||
1788 | /* | |
1789 | * Function: scsi_report_bus_reset() | |
1790 | * | |
1791 | * Purpose: Utility function used by low-level drivers to report that | |
1792 | * they have observed a bus reset on the bus being handled. | |
1793 | * | |
1794 | * Arguments: shost - Host in question | |
1795 | * channel - channel on which reset was observed. | |
1796 | * | |
1797 | * Returns: Nothing | |
1798 | * | |
1799 | * Lock status: Host lock must be held. | |
1800 | * | |
1801 | * Notes: This only needs to be called if the reset is one which | |
1802 | * originates from an unknown location. Resets originated | |
1803 | * by the mid-level itself don't need to call this, but there | |
1804 | * should be no harm. | |
1805 | * | |
1806 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
1807 | * is properly treated. | |
1808 | */ | |
1809 | void scsi_report_bus_reset(struct Scsi_Host *shost, int channel) | |
1810 | { | |
1811 | struct scsi_device *sdev; | |
1812 | ||
1813 | __shost_for_each_device(sdev, shost) { | |
30bd7df8 MC |
1814 | if (channel == sdev_channel(sdev)) |
1815 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
1816 | } |
1817 | } | |
1818 | EXPORT_SYMBOL(scsi_report_bus_reset); | |
1819 | ||
1820 | /* | |
1821 | * Function: scsi_report_device_reset() | |
1822 | * | |
1823 | * Purpose: Utility function used by low-level drivers to report that | |
1824 | * they have observed a device reset on the device being handled. | |
1825 | * | |
1826 | * Arguments: shost - Host in question | |
1827 | * channel - channel on which reset was observed | |
1828 | * target - target on which reset was observed | |
1829 | * | |
1830 | * Returns: Nothing | |
1831 | * | |
1832 | * Lock status: Host lock must be held | |
1833 | * | |
1834 | * Notes: This only needs to be called if the reset is one which | |
1835 | * originates from an unknown location. Resets originated | |
1836 | * by the mid-level itself don't need to call this, but there | |
1837 | * should be no harm. | |
1838 | * | |
1839 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
1840 | * is properly treated. | |
1841 | */ | |
1842 | void scsi_report_device_reset(struct Scsi_Host *shost, int channel, int target) | |
1843 | { | |
1844 | struct scsi_device *sdev; | |
1845 | ||
1846 | __shost_for_each_device(sdev, shost) { | |
422c0d61 | 1847 | if (channel == sdev_channel(sdev) && |
30bd7df8 MC |
1848 | target == sdev_id(sdev)) |
1849 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
1850 | } |
1851 | } | |
1852 | EXPORT_SYMBOL(scsi_report_device_reset); | |
1853 | ||
1854 | static void | |
1855 | scsi_reset_provider_done_command(struct scsi_cmnd *scmd) | |
1856 | { | |
1857 | } | |
1858 | ||
1859 | /* | |
1860 | * Function: scsi_reset_provider | |
1861 | * | |
1862 | * Purpose: Send requested reset to a bus or device at any phase. | |
1863 | * | |
1864 | * Arguments: device - device to send reset to | |
1865 | * flag - reset type (see scsi.h) | |
1866 | * | |
1867 | * Returns: SUCCESS/FAILURE. | |
1868 | * | |
1869 | * Notes: This is used by the SCSI Generic driver to provide | |
1870 | * Bus/Device reset capability. | |
1871 | */ | |
1872 | int | |
1873 | scsi_reset_provider(struct scsi_device *dev, int flag) | |
1874 | { | |
1875 | struct scsi_cmnd *scmd = scsi_get_command(dev, GFP_KERNEL); | |
d7a1bb0a | 1876 | struct Scsi_Host *shost = dev->host; |
1da177e4 | 1877 | struct request req; |
d7a1bb0a | 1878 | unsigned long flags; |
1da177e4 LT |
1879 | int rtn; |
1880 | ||
4f54eec8 | 1881 | blk_rq_init(NULL, &req); |
1da177e4 | 1882 | scmd->request = &req; |
b4edcbca | 1883 | |
64a87b24 BH |
1884 | scmd->cmnd = req.cmd; |
1885 | ||
1da177e4 | 1886 | scmd->scsi_done = scsi_reset_provider_done_command; |
30b0c37b | 1887 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
1da177e4 LT |
1888 | |
1889 | scmd->cmd_len = 0; | |
1890 | ||
1891 | scmd->sc_data_direction = DMA_BIDIRECTIONAL; | |
1da177e4 | 1892 | |
d7a1bb0a JS |
1893 | spin_lock_irqsave(shost->host_lock, flags); |
1894 | shost->tmf_in_progress = 1; | |
1895 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1896 | ||
1da177e4 LT |
1897 | switch (flag) { |
1898 | case SCSI_TRY_RESET_DEVICE: | |
1899 | rtn = scsi_try_bus_device_reset(scmd); | |
1900 | if (rtn == SUCCESS) | |
1901 | break; | |
1902 | /* FALLTHROUGH */ | |
30bd7df8 MC |
1903 | case SCSI_TRY_RESET_TARGET: |
1904 | rtn = scsi_try_target_reset(scmd); | |
1905 | if (rtn == SUCCESS) | |
1906 | break; | |
1907 | /* FALLTHROUGH */ | |
1da177e4 LT |
1908 | case SCSI_TRY_RESET_BUS: |
1909 | rtn = scsi_try_bus_reset(scmd); | |
1910 | if (rtn == SUCCESS) | |
1911 | break; | |
1912 | /* FALLTHROUGH */ | |
1913 | case SCSI_TRY_RESET_HOST: | |
1914 | rtn = scsi_try_host_reset(scmd); | |
1915 | break; | |
1916 | default: | |
1917 | rtn = FAILED; | |
1918 | } | |
1919 | ||
d7a1bb0a JS |
1920 | spin_lock_irqsave(shost->host_lock, flags); |
1921 | shost->tmf_in_progress = 0; | |
1922 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1923 | ||
1924 | /* | |
1925 | * be sure to wake up anyone who was sleeping or had their queue | |
1926 | * suspended while we performed the TMF. | |
1927 | */ | |
1928 | SCSI_LOG_ERROR_RECOVERY(3, | |
1929 | printk("%s: waking up host to restart after TMF\n", | |
cadbd4a5 | 1930 | __func__)); |
d7a1bb0a JS |
1931 | |
1932 | wake_up(&shost->host_wait); | |
1933 | ||
1934 | scsi_run_host_queues(shost); | |
1935 | ||
1da177e4 LT |
1936 | scsi_next_command(scmd); |
1937 | return rtn; | |
1938 | } | |
1939 | EXPORT_SYMBOL(scsi_reset_provider); | |
1940 | ||
1941 | /** | |
1942 | * scsi_normalize_sense - normalize main elements from either fixed or | |
1943 | * descriptor sense data format into a common format. | |
1944 | * | |
1945 | * @sense_buffer: byte array containing sense data returned by device | |
1946 | * @sb_len: number of valid bytes in sense_buffer | |
1947 | * @sshdr: pointer to instance of structure that common | |
1948 | * elements are written to. | |
1949 | * | |
1950 | * Notes: | |
1951 | * The "main elements" from sense data are: response_code, sense_key, | |
1952 | * asc, ascq and additional_length (only for descriptor format). | |
1953 | * | |
1954 | * Typically this function can be called after a device has | |
1955 | * responded to a SCSI command with the CHECK_CONDITION status. | |
1956 | * | |
1957 | * Return value: | |
1958 | * 1 if valid sense data information found, else 0; | |
dc8875e1 | 1959 | */ |
1da177e4 LT |
1960 | int scsi_normalize_sense(const u8 *sense_buffer, int sb_len, |
1961 | struct scsi_sense_hdr *sshdr) | |
1962 | { | |
33aa687d | 1963 | if (!sense_buffer || !sb_len) |
1da177e4 LT |
1964 | return 0; |
1965 | ||
1966 | memset(sshdr, 0, sizeof(struct scsi_sense_hdr)); | |
1967 | ||
1968 | sshdr->response_code = (sense_buffer[0] & 0x7f); | |
33aa687d JB |
1969 | |
1970 | if (!scsi_sense_valid(sshdr)) | |
1971 | return 0; | |
1972 | ||
1da177e4 LT |
1973 | if (sshdr->response_code >= 0x72) { |
1974 | /* | |
1975 | * descriptor format | |
1976 | */ | |
1977 | if (sb_len > 1) | |
1978 | sshdr->sense_key = (sense_buffer[1] & 0xf); | |
1979 | if (sb_len > 2) | |
1980 | sshdr->asc = sense_buffer[2]; | |
1981 | if (sb_len > 3) | |
1982 | sshdr->ascq = sense_buffer[3]; | |
1983 | if (sb_len > 7) | |
1984 | sshdr->additional_length = sense_buffer[7]; | |
1985 | } else { | |
1986 | /* | |
1987 | * fixed format | |
1988 | */ | |
1989 | if (sb_len > 2) | |
1990 | sshdr->sense_key = (sense_buffer[2] & 0xf); | |
1991 | if (sb_len > 7) { | |
1992 | sb_len = (sb_len < (sense_buffer[7] + 8)) ? | |
1993 | sb_len : (sense_buffer[7] + 8); | |
1994 | if (sb_len > 12) | |
1995 | sshdr->asc = sense_buffer[12]; | |
1996 | if (sb_len > 13) | |
1997 | sshdr->ascq = sense_buffer[13]; | |
1998 | } | |
1999 | } | |
2000 | ||
2001 | return 1; | |
2002 | } | |
2003 | EXPORT_SYMBOL(scsi_normalize_sense); | |
2004 | ||
1da177e4 LT |
2005 | int scsi_command_normalize_sense(struct scsi_cmnd *cmd, |
2006 | struct scsi_sense_hdr *sshdr) | |
2007 | { | |
2008 | return scsi_normalize_sense(cmd->sense_buffer, | |
b80ca4f7 | 2009 | SCSI_SENSE_BUFFERSIZE, sshdr); |
1da177e4 LT |
2010 | } |
2011 | EXPORT_SYMBOL(scsi_command_normalize_sense); | |
2012 | ||
2013 | /** | |
eb44820c | 2014 | * scsi_sense_desc_find - search for a given descriptor type in descriptor sense data format. |
1da177e4 LT |
2015 | * @sense_buffer: byte array of descriptor format sense data |
2016 | * @sb_len: number of valid bytes in sense_buffer | |
2017 | * @desc_type: value of descriptor type to find | |
2018 | * (e.g. 0 -> information) | |
2019 | * | |
2020 | * Notes: | |
2021 | * only valid when sense data is in descriptor format | |
2022 | * | |
2023 | * Return value: | |
2024 | * pointer to start of (first) descriptor if found else NULL | |
dc8875e1 | 2025 | */ |
1da177e4 LT |
2026 | const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len, |
2027 | int desc_type) | |
2028 | { | |
2029 | int add_sen_len, add_len, desc_len, k; | |
2030 | const u8 * descp; | |
2031 | ||
2032 | if ((sb_len < 8) || (0 == (add_sen_len = sense_buffer[7]))) | |
2033 | return NULL; | |
2034 | if ((sense_buffer[0] < 0x72) || (sense_buffer[0] > 0x73)) | |
2035 | return NULL; | |
2036 | add_sen_len = (add_sen_len < (sb_len - 8)) ? | |
2037 | add_sen_len : (sb_len - 8); | |
2038 | descp = &sense_buffer[8]; | |
2039 | for (desc_len = 0, k = 0; k < add_sen_len; k += desc_len) { | |
2040 | descp += desc_len; | |
2041 | add_len = (k < (add_sen_len - 1)) ? descp[1]: -1; | |
2042 | desc_len = add_len + 2; | |
2043 | if (descp[0] == desc_type) | |
2044 | return descp; | |
2045 | if (add_len < 0) // short descriptor ?? | |
2046 | break; | |
2047 | } | |
2048 | return NULL; | |
2049 | } | |
2050 | EXPORT_SYMBOL(scsi_sense_desc_find); | |
2051 | ||
2052 | /** | |
eb44820c | 2053 | * scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor format) |
1da177e4 LT |
2054 | * @sense_buffer: byte array of sense data |
2055 | * @sb_len: number of valid bytes in sense_buffer | |
2056 | * @info_out: pointer to 64 integer where 8 or 4 byte information | |
2057 | * field will be placed if found. | |
2058 | * | |
2059 | * Return value: | |
2060 | * 1 if information field found, 0 if not found. | |
dc8875e1 | 2061 | */ |
1da177e4 LT |
2062 | int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len, |
2063 | u64 * info_out) | |
2064 | { | |
2065 | int j; | |
2066 | const u8 * ucp; | |
2067 | u64 ull; | |
2068 | ||
2069 | if (sb_len < 7) | |
2070 | return 0; | |
2071 | switch (sense_buffer[0] & 0x7f) { | |
2072 | case 0x70: | |
2073 | case 0x71: | |
2074 | if (sense_buffer[0] & 0x80) { | |
2075 | *info_out = (sense_buffer[3] << 24) + | |
2076 | (sense_buffer[4] << 16) + | |
2077 | (sense_buffer[5] << 8) + sense_buffer[6]; | |
2078 | return 1; | |
2079 | } else | |
2080 | return 0; | |
2081 | case 0x72: | |
2082 | case 0x73: | |
2083 | ucp = scsi_sense_desc_find(sense_buffer, sb_len, | |
2084 | 0 /* info desc */); | |
2085 | if (ucp && (0xa == ucp[1])) { | |
2086 | ull = 0; | |
2087 | for (j = 0; j < 8; ++j) { | |
2088 | if (j > 0) | |
2089 | ull <<= 8; | |
2090 | ull |= ucp[4 + j]; | |
2091 | } | |
2092 | *info_out = ull; | |
2093 | return 1; | |
2094 | } else | |
2095 | return 0; | |
2096 | default: | |
2097 | return 0; | |
2098 | } | |
2099 | } | |
2100 | EXPORT_SYMBOL(scsi_get_sense_info_fld); | |
3bc6a261 FT |
2101 | |
2102 | /** | |
2103 | * scsi_build_sense_buffer - build sense data in a buffer | |
2104 | * @desc: Sense format (non zero == descriptor format, | |
2105 | * 0 == fixed format) | |
2106 | * @buf: Where to build sense data | |
2107 | * @key: Sense key | |
2108 | * @asc: Additional sense code | |
2109 | * @ascq: Additional sense code qualifier | |
2110 | * | |
2111 | **/ | |
2112 | void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq) | |
2113 | { | |
2114 | if (desc) { | |
2115 | buf[0] = 0x72; /* descriptor, current */ | |
2116 | buf[1] = key; | |
2117 | buf[2] = asc; | |
2118 | buf[3] = ascq; | |
2119 | buf[7] = 0; | |
2120 | } else { | |
2121 | buf[0] = 0x70; /* fixed, current */ | |
2122 | buf[2] = key; | |
2123 | buf[7] = 0xa; | |
2124 | buf[12] = asc; | |
2125 | buf[13] = ascq; | |
2126 | } | |
2127 | } | |
2128 | EXPORT_SYMBOL(scsi_build_sense_buffer); |