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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 | 309 | |
6e49949c MC |
310 | if (sshdr.asc == 0x3f && sshdr.ascq == 0x0e) |
311 | scmd_printk(KERN_WARNING, scmd, | |
312 | "Warning! Received an indication that the " | |
313 | "LUN assignments on this target have " | |
314 | "changed. The Linux SCSI layer does not " | |
315 | "automatically remap LUN assignments.\n"); | |
316 | else if (sshdr.asc == 0x3f) | |
317 | scmd_printk(KERN_WARNING, scmd, | |
318 | "Warning! Received an indication that the " | |
319 | "operating parameters on this target have " | |
320 | "changed. The Linux SCSI layer does not " | |
321 | "automatically adjust these parameters.\n"); | |
322 | ||
02e031cb CH |
323 | /* |
324 | * Pass the UA upwards for a determination in the completion | |
325 | * functions. | |
326 | */ | |
327 | return SUCCESS; | |
1da177e4 LT |
328 | |
329 | /* these three are not supported */ | |
330 | case COPY_ABORTED: | |
331 | case VOLUME_OVERFLOW: | |
332 | case MISCOMPARE: | |
333 | return SUCCESS; | |
334 | ||
335 | case MEDIUM_ERROR: | |
fd1b494d LT |
336 | if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */ |
337 | sshdr.asc == 0x13 || /* AMNF DATA FIELD */ | |
338 | sshdr.asc == 0x14) { /* RECORD NOT FOUND */ | |
339 | return SUCCESS; | |
340 | } | |
1da177e4 LT |
341 | return NEEDS_RETRY; |
342 | ||
343 | case HARDWARE_ERROR: | |
344 | if (scmd->device->retry_hwerror) | |
bb0003c1 | 345 | return ADD_TO_MLQUEUE; |
1da177e4 LT |
346 | else |
347 | return SUCCESS; | |
348 | ||
349 | case ILLEGAL_REQUEST: | |
350 | case BLANK_CHECK: | |
351 | case DATA_PROTECT: | |
352 | default: | |
353 | return SUCCESS; | |
354 | } | |
355 | } | |
356 | ||
4a84067d VD |
357 | static void scsi_handle_queue_ramp_up(struct scsi_device *sdev) |
358 | { | |
359 | struct scsi_host_template *sht = sdev->host->hostt; | |
360 | struct scsi_device *tmp_sdev; | |
361 | ||
362 | if (!sht->change_queue_depth || | |
363 | sdev->queue_depth >= sdev->max_queue_depth) | |
364 | return; | |
365 | ||
366 | if (time_before(jiffies, | |
367 | sdev->last_queue_ramp_up + sdev->queue_ramp_up_period)) | |
368 | return; | |
369 | ||
370 | if (time_before(jiffies, | |
371 | sdev->last_queue_full_time + sdev->queue_ramp_up_period)) | |
372 | return; | |
373 | ||
374 | /* | |
375 | * Walk all devices of a target and do | |
376 | * ramp up on them. | |
377 | */ | |
378 | shost_for_each_device(tmp_sdev, sdev->host) { | |
379 | if (tmp_sdev->channel != sdev->channel || | |
380 | tmp_sdev->id != sdev->id || | |
381 | tmp_sdev->queue_depth == sdev->max_queue_depth) | |
382 | continue; | |
383 | /* | |
384 | * call back into LLD to increase queue_depth by one | |
385 | * with ramp up reason code. | |
386 | */ | |
387 | sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1, | |
388 | SCSI_QDEPTH_RAMP_UP); | |
389 | sdev->last_queue_ramp_up = jiffies; | |
390 | } | |
391 | } | |
392 | ||
42a6a918 MC |
393 | static void scsi_handle_queue_full(struct scsi_device *sdev) |
394 | { | |
395 | struct scsi_host_template *sht = sdev->host->hostt; | |
396 | struct scsi_device *tmp_sdev; | |
397 | ||
398 | if (!sht->change_queue_depth) | |
399 | return; | |
400 | ||
401 | shost_for_each_device(tmp_sdev, sdev->host) { | |
402 | if (tmp_sdev->channel != sdev->channel || | |
403 | tmp_sdev->id != sdev->id) | |
404 | continue; | |
405 | /* | |
406 | * We do not know the number of commands that were at | |
407 | * the device when we got the queue full so we start | |
408 | * from the highest possible value and work our way down. | |
409 | */ | |
410 | sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth - 1, | |
411 | SCSI_QDEPTH_QFULL); | |
412 | } | |
413 | } | |
414 | ||
1da177e4 LT |
415 | /** |
416 | * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD. | |
417 | * @scmd: SCSI cmd to examine. | |
418 | * | |
419 | * Notes: | |
420 | * This is *only* called when we are examining the status of commands | |
421 | * queued during error recovery. the main difference here is that we | |
422 | * don't allow for the possibility of retries here, and we are a lot | |
423 | * more restrictive about what we consider acceptable. | |
dc8875e1 | 424 | */ |
1da177e4 LT |
425 | static int scsi_eh_completed_normally(struct scsi_cmnd *scmd) |
426 | { | |
427 | /* | |
428 | * first check the host byte, to see if there is anything in there | |
429 | * that would indicate what we need to do. | |
430 | */ | |
431 | if (host_byte(scmd->result) == DID_RESET) { | |
432 | /* | |
433 | * rats. we are already in the error handler, so we now | |
434 | * get to try and figure out what to do next. if the sense | |
435 | * is valid, we have a pretty good idea of what to do. | |
436 | * if not, we mark it as FAILED. | |
437 | */ | |
438 | return scsi_check_sense(scmd); | |
439 | } | |
440 | if (host_byte(scmd->result) != DID_OK) | |
441 | return FAILED; | |
442 | ||
443 | /* | |
444 | * next, check the message byte. | |
445 | */ | |
446 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
447 | return FAILED; | |
448 | ||
449 | /* | |
450 | * now, check the status byte to see if this indicates | |
451 | * anything special. | |
452 | */ | |
453 | switch (status_byte(scmd->result)) { | |
454 | case GOOD: | |
4a84067d | 455 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 LT |
456 | case COMMAND_TERMINATED: |
457 | return SUCCESS; | |
458 | case CHECK_CONDITION: | |
459 | return scsi_check_sense(scmd); | |
460 | case CONDITION_GOOD: | |
461 | case INTERMEDIATE_GOOD: | |
462 | case INTERMEDIATE_C_GOOD: | |
463 | /* | |
464 | * who knows? FIXME(eric) | |
465 | */ | |
466 | return SUCCESS; | |
5f91bb05 | 467 | case RESERVATION_CONFLICT: |
67110dfd JB |
468 | if (scmd->cmnd[0] == TEST_UNIT_READY) |
469 | /* it is a success, we probed the device and | |
470 | * found it */ | |
471 | return SUCCESS; | |
472 | /* otherwise, we failed to send the command */ | |
473 | return FAILED; | |
1da177e4 | 474 | case QUEUE_FULL: |
42a6a918 MC |
475 | scsi_handle_queue_full(scmd->device); |
476 | /* fall through */ | |
477 | case BUSY: | |
3eb3a928 | 478 | return NEEDS_RETRY; |
1da177e4 LT |
479 | default: |
480 | return FAILED; | |
481 | } | |
482 | return FAILED; | |
483 | } | |
484 | ||
1da177e4 LT |
485 | /** |
486 | * scsi_eh_done - Completion function for error handling. | |
487 | * @scmd: Cmd that is done. | |
dc8875e1 | 488 | */ |
1da177e4 LT |
489 | static void scsi_eh_done(struct scsi_cmnd *scmd) |
490 | { | |
85631672 MR |
491 | struct completion *eh_action; |
492 | ||
7dfdc9a5 CH |
493 | SCSI_LOG_ERROR_RECOVERY(3, |
494 | printk("%s scmd: %p result: %x\n", | |
cadbd4a5 | 495 | __func__, scmd, scmd->result)); |
85631672 MR |
496 | |
497 | eh_action = scmd->device->host->eh_action; | |
498 | if (eh_action) | |
499 | complete(eh_action); | |
1da177e4 LT |
500 | } |
501 | ||
292148f8 BK |
502 | /** |
503 | * scsi_try_host_reset - ask host adapter to reset itself | |
504 | * @scmd: SCSI cmd to send hsot reset. | |
dc8875e1 | 505 | */ |
292148f8 BK |
506 | static int scsi_try_host_reset(struct scsi_cmnd *scmd) |
507 | { | |
508 | unsigned long flags; | |
509 | int rtn; | |
510 | ||
511 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Host RST\n", | |
cadbd4a5 | 512 | __func__)); |
292148f8 BK |
513 | |
514 | if (!scmd->device->host->hostt->eh_host_reset_handler) | |
515 | return FAILED; | |
516 | ||
517 | rtn = scmd->device->host->hostt->eh_host_reset_handler(scmd); | |
518 | ||
519 | if (rtn == SUCCESS) { | |
520 | if (!scmd->device->host->hostt->skip_settle_delay) | |
521 | ssleep(HOST_RESET_SETTLE_TIME); | |
522 | spin_lock_irqsave(scmd->device->host->host_lock, flags); | |
523 | scsi_report_bus_reset(scmd->device->host, | |
524 | scmd_channel(scmd)); | |
525 | spin_unlock_irqrestore(scmd->device->host->host_lock, flags); | |
526 | } | |
527 | ||
528 | return rtn; | |
529 | } | |
530 | ||
531 | /** | |
532 | * scsi_try_bus_reset - ask host to perform a bus reset | |
533 | * @scmd: SCSI cmd to send bus reset. | |
dc8875e1 | 534 | */ |
292148f8 BK |
535 | static int scsi_try_bus_reset(struct scsi_cmnd *scmd) |
536 | { | |
537 | unsigned long flags; | |
538 | int rtn; | |
539 | ||
540 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Bus RST\n", | |
cadbd4a5 | 541 | __func__)); |
292148f8 BK |
542 | |
543 | if (!scmd->device->host->hostt->eh_bus_reset_handler) | |
544 | return FAILED; | |
545 | ||
546 | rtn = scmd->device->host->hostt->eh_bus_reset_handler(scmd); | |
547 | ||
548 | if (rtn == SUCCESS) { | |
549 | if (!scmd->device->host->hostt->skip_settle_delay) | |
550 | ssleep(BUS_RESET_SETTLE_TIME); | |
551 | spin_lock_irqsave(scmd->device->host->host_lock, flags); | |
552 | scsi_report_bus_reset(scmd->device->host, | |
553 | scmd_channel(scmd)); | |
554 | spin_unlock_irqrestore(scmd->device->host->host_lock, flags); | |
555 | } | |
556 | ||
557 | return rtn; | |
558 | } | |
559 | ||
30bd7df8 MC |
560 | static void __scsi_report_device_reset(struct scsi_device *sdev, void *data) |
561 | { | |
562 | sdev->was_reset = 1; | |
563 | sdev->expecting_cc_ua = 1; | |
564 | } | |
565 | ||
566 | /** | |
567 | * scsi_try_target_reset - Ask host to perform a target reset | |
568 | * @scmd: SCSI cmd used to send a target reset | |
569 | * | |
570 | * Notes: | |
571 | * There is no timeout for this operation. if this operation is | |
572 | * unreliable for a given host, then the host itself needs to put a | |
573 | * timer on it, and set the host back to a consistent state prior to | |
574 | * returning. | |
575 | */ | |
576 | static int scsi_try_target_reset(struct scsi_cmnd *scmd) | |
577 | { | |
578 | unsigned long flags; | |
579 | int rtn; | |
580 | ||
581 | if (!scmd->device->host->hostt->eh_target_reset_handler) | |
582 | return FAILED; | |
583 | ||
584 | rtn = scmd->device->host->hostt->eh_target_reset_handler(scmd); | |
585 | if (rtn == SUCCESS) { | |
586 | spin_lock_irqsave(scmd->device->host->host_lock, flags); | |
587 | __starget_for_each_device(scsi_target(scmd->device), NULL, | |
588 | __scsi_report_device_reset); | |
589 | spin_unlock_irqrestore(scmd->device->host->host_lock, flags); | |
590 | } | |
591 | ||
592 | return rtn; | |
593 | } | |
594 | ||
292148f8 BK |
595 | /** |
596 | * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev | |
597 | * @scmd: SCSI cmd used to send BDR | |
598 | * | |
599 | * Notes: | |
600 | * There is no timeout for this operation. if this operation is | |
601 | * unreliable for a given host, then the host itself needs to put a | |
602 | * timer on it, and set the host back to a consistent state prior to | |
603 | * returning. | |
dc8875e1 | 604 | */ |
292148f8 BK |
605 | static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd) |
606 | { | |
607 | int rtn; | |
608 | ||
609 | if (!scmd->device->host->hostt->eh_device_reset_handler) | |
610 | return FAILED; | |
611 | ||
612 | rtn = scmd->device->host->hostt->eh_device_reset_handler(scmd); | |
30bd7df8 MC |
613 | if (rtn == SUCCESS) |
614 | __scsi_report_device_reset(scmd->device, NULL); | |
292148f8 BK |
615 | return rtn; |
616 | } | |
617 | ||
459dbf72 | 618 | static int scsi_try_to_abort_cmd(struct scsi_cmnd *scmd) |
292148f8 BK |
619 | { |
620 | if (!scmd->device->host->hostt->eh_abort_handler) | |
621 | return FAILED; | |
622 | ||
623 | return scmd->device->host->hostt->eh_abort_handler(scmd); | |
624 | } | |
625 | ||
292148f8 BK |
626 | static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd) |
627 | { | |
459dbf72 | 628 | if (scsi_try_to_abort_cmd(scmd) != SUCCESS) |
292148f8 | 629 | if (scsi_try_bus_device_reset(scmd) != SUCCESS) |
30bd7df8 MC |
630 | if (scsi_try_target_reset(scmd) != SUCCESS) |
631 | if (scsi_try_bus_reset(scmd) != SUCCESS) | |
632 | scsi_try_host_reset(scmd); | |
292148f8 BK |
633 | } |
634 | ||
1da177e4 | 635 | /** |
e1c23468 | 636 | * scsi_eh_prep_cmnd - Save a scsi command info as part of error recory |
2dc611de | 637 | * @scmd: SCSI command structure to hijack |
e1c23468 | 638 | * @ses: structure to save restore information |
55db6c1b | 639 | * @cmnd: CDB to send. Can be NULL if no new cmnd is needed |
64a87b24 | 640 | * @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB) |
55db6c1b | 641 | * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored) |
2dc611de | 642 | * |
e1c23468 | 643 | * This function is used to save a scsi command information before re-execution |
55db6c1b BH |
644 | * as part of the error recovery process. If @sense_bytes is 0 the command |
645 | * sent must be one that does not transfer any data. If @sense_bytes != 0 | |
646 | * @cmnd is ignored and this functions sets up a REQUEST_SENSE command | |
647 | * and cmnd buffers to read @sense_bytes into @scmd->sense_buffer. | |
dc8875e1 | 648 | */ |
e1c23468 BH |
649 | void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, |
650 | unsigned char *cmnd, int cmnd_size, unsigned sense_bytes) | |
1da177e4 | 651 | { |
f59114b7 | 652 | struct scsi_device *sdev = scmd->device; |
1da177e4 | 653 | |
631c228c CH |
654 | /* |
655 | * We need saved copies of a number of fields - this is because | |
656 | * error handling may need to overwrite these with different values | |
657 | * to run different commands, and once error handling is complete, | |
658 | * we will need to restore these values prior to running the actual | |
659 | * command. | |
660 | */ | |
e1c23468 | 661 | ses->cmd_len = scmd->cmd_len; |
64a87b24 | 662 | ses->cmnd = scmd->cmnd; |
e1c23468 | 663 | ses->data_direction = scmd->sc_data_direction; |
30b0c37b | 664 | ses->sdb = scmd->sdb; |
6f9a35e2 | 665 | ses->next_rq = scmd->request->next_rq; |
e1c23468 | 666 | ses->result = scmd->result; |
12265709 | 667 | ses->underflow = scmd->underflow; |
db007fc5 | 668 | ses->prot_op = scmd->prot_op; |
631c228c | 669 | |
db007fc5 | 670 | scmd->prot_op = SCSI_PROT_NORMAL; |
64a87b24 BH |
671 | scmd->cmnd = ses->eh_cmnd; |
672 | memset(scmd->cmnd, 0, BLK_MAX_CDB); | |
30b0c37b | 673 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
6f9a35e2 | 674 | scmd->request->next_rq = NULL; |
30b0c37b | 675 | |
55db6c1b | 676 | if (sense_bytes) { |
30b0c37b BH |
677 | scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE, |
678 | sense_bytes); | |
e1c23468 | 679 | sg_init_one(&ses->sense_sgl, scmd->sense_buffer, |
30b0c37b BH |
680 | scmd->sdb.length); |
681 | scmd->sdb.table.sgl = &ses->sense_sgl; | |
55db6c1b | 682 | scmd->sc_data_direction = DMA_FROM_DEVICE; |
30b0c37b | 683 | scmd->sdb.table.nents = 1; |
55db6c1b | 684 | scmd->cmnd[0] = REQUEST_SENSE; |
30b0c37b | 685 | scmd->cmnd[4] = scmd->sdb.length; |
55db6c1b | 686 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); |
631c228c | 687 | } else { |
631c228c | 688 | scmd->sc_data_direction = DMA_NONE; |
55db6c1b | 689 | if (cmnd) { |
64a87b24 | 690 | BUG_ON(cmnd_size > BLK_MAX_CDB); |
55db6c1b BH |
691 | memcpy(scmd->cmnd, cmnd, cmnd_size); |
692 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); | |
693 | } | |
631c228c CH |
694 | } |
695 | ||
696 | scmd->underflow = 0; | |
631c228c | 697 | |
55db6c1b | 698 | if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN) |
1da177e4 | 699 | scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) | |
f59114b7 | 700 | (sdev->lun << 5 & 0xe0); |
1da177e4 | 701 | |
631c228c CH |
702 | /* |
703 | * Zero the sense buffer. The scsi spec mandates that any | |
704 | * untransferred sense data should be interpreted as being zero. | |
705 | */ | |
b80ca4f7 | 706 | memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); |
e1c23468 BH |
707 | } |
708 | EXPORT_SYMBOL(scsi_eh_prep_cmnd); | |
709 | ||
710 | /** | |
711 | * scsi_eh_restore_cmnd - Restore a scsi command info as part of error recory | |
712 | * @scmd: SCSI command structure to restore | |
477e608c | 713 | * @ses: saved information from a coresponding call to scsi_eh_prep_cmnd |
e1c23468 | 714 | * |
477e608c | 715 | * Undo any damage done by above scsi_eh_prep_cmnd(). |
dc8875e1 | 716 | */ |
e1c23468 BH |
717 | void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses) |
718 | { | |
719 | /* | |
720 | * Restore original data | |
721 | */ | |
722 | scmd->cmd_len = ses->cmd_len; | |
64a87b24 | 723 | scmd->cmnd = ses->cmnd; |
e1c23468 | 724 | scmd->sc_data_direction = ses->data_direction; |
30b0c37b | 725 | scmd->sdb = ses->sdb; |
6f9a35e2 | 726 | scmd->request->next_rq = ses->next_rq; |
e1c23468 | 727 | scmd->result = ses->result; |
12265709 | 728 | scmd->underflow = ses->underflow; |
db007fc5 | 729 | scmd->prot_op = ses->prot_op; |
e1c23468 BH |
730 | } |
731 | EXPORT_SYMBOL(scsi_eh_restore_cmnd); | |
631c228c | 732 | |
e1c23468 BH |
733 | /** |
734 | * scsi_send_eh_cmnd - submit a scsi command as part of error recory | |
735 | * @scmd: SCSI command structure to hijack | |
736 | * @cmnd: CDB to send | |
737 | * @cmnd_size: size in bytes of @cmnd | |
738 | * @timeout: timeout for this request | |
739 | * @sense_bytes: size of sense data to copy or 0 | |
740 | * | |
741 | * This function is used to send a scsi command down to a target device | |
742 | * as part of the error recovery process. See also scsi_eh_prep_cmnd() above. | |
743 | * | |
744 | * Return value: | |
745 | * SUCCESS or FAILED or NEEDS_RETRY | |
dc8875e1 | 746 | */ |
e1c23468 BH |
747 | static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd, |
748 | int cmnd_size, int timeout, unsigned sense_bytes) | |
749 | { | |
750 | struct scsi_device *sdev = scmd->device; | |
751 | struct Scsi_Host *shost = sdev->host; | |
752 | DECLARE_COMPLETION_ONSTACK(done); | |
753 | unsigned long timeleft; | |
e1c23468 BH |
754 | struct scsi_eh_save ses; |
755 | int rtn; | |
756 | ||
757 | scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes); | |
7dfdc9a5 | 758 | shost->eh_action = &done; |
1da177e4 | 759 | |
1da177e4 | 760 | scsi_log_send(scmd); |
f281233d JG |
761 | scmd->scsi_done = scsi_eh_done; |
762 | shost->hostt->queuecommand(shost, scmd); | |
1da177e4 | 763 | |
7dfdc9a5 | 764 | timeleft = wait_for_completion_timeout(&done, timeout); |
1da177e4 | 765 | |
f59114b7 | 766 | shost->eh_action = NULL; |
1da177e4 | 767 | |
7dfdc9a5 | 768 | scsi_log_completion(scmd, SUCCESS); |
1da177e4 | 769 | |
7dfdc9a5 CH |
770 | SCSI_LOG_ERROR_RECOVERY(3, |
771 | printk("%s: scmd: %p, timeleft: %ld\n", | |
cadbd4a5 | 772 | __func__, scmd, timeleft)); |
1da177e4 LT |
773 | |
774 | /* | |
7dfdc9a5 CH |
775 | * If there is time left scsi_eh_done got called, and we will |
776 | * examine the actual status codes to see whether the command | |
777 | * actually did complete normally, else tell the host to forget | |
778 | * about this command. | |
1da177e4 | 779 | */ |
7dfdc9a5 | 780 | if (timeleft) { |
1da177e4 LT |
781 | rtn = scsi_eh_completed_normally(scmd); |
782 | SCSI_LOG_ERROR_RECOVERY(3, | |
783 | printk("%s: scsi_eh_completed_normally %x\n", | |
cadbd4a5 | 784 | __func__, rtn)); |
7dfdc9a5 | 785 | |
1da177e4 LT |
786 | switch (rtn) { |
787 | case SUCCESS: | |
788 | case NEEDS_RETRY: | |
789 | case FAILED: | |
790 | break; | |
6e883b0e HR |
791 | case ADD_TO_MLQUEUE: |
792 | rtn = NEEDS_RETRY; | |
793 | break; | |
1da177e4 LT |
794 | default: |
795 | rtn = FAILED; | |
796 | break; | |
797 | } | |
7dfdc9a5 | 798 | } else { |
292148f8 | 799 | scsi_abort_eh_cmnd(scmd); |
7dfdc9a5 | 800 | rtn = FAILED; |
1da177e4 LT |
801 | } |
802 | ||
e1c23468 | 803 | scsi_eh_restore_cmnd(scmd, &ses); |
1da177e4 LT |
804 | return rtn; |
805 | } | |
806 | ||
807 | /** | |
808 | * scsi_request_sense - Request sense data from a particular target. | |
809 | * @scmd: SCSI cmd for request sense. | |
810 | * | |
811 | * Notes: | |
812 | * Some hosts automatically obtain this information, others require | |
813 | * that we obtain it on our own. This function will *not* return until | |
814 | * the command either times out, or it completes. | |
dc8875e1 | 815 | */ |
1da177e4 LT |
816 | static int scsi_request_sense(struct scsi_cmnd *scmd) |
817 | { | |
55db6c1b | 818 | return scsi_send_eh_cmnd(scmd, NULL, 0, SENSE_TIMEOUT, ~0); |
1da177e4 LT |
819 | } |
820 | ||
821 | /** | |
822 | * scsi_eh_finish_cmd - Handle a cmd that eh is finished with. | |
823 | * @scmd: Original SCSI cmd that eh has finished. | |
824 | * @done_q: Queue for processed commands. | |
825 | * | |
826 | * Notes: | |
827 | * We don't want to use the normal command completion while we are are | |
828 | * still handling errors - it may cause other commands to be queued, | |
eb44820c | 829 | * and that would disturb what we are doing. Thus we really want to |
1da177e4 LT |
830 | * keep a list of pending commands for final completion, and once we |
831 | * are ready to leave error handling we handle completion for real. | |
dc8875e1 | 832 | */ |
041c5fc3 | 833 | void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q) |
1da177e4 LT |
834 | { |
835 | scmd->device->host->host_failed--; | |
3111b0d1 | 836 | scmd->eh_eflags = 0; |
1da177e4 LT |
837 | list_move_tail(&scmd->eh_entry, done_q); |
838 | } | |
041c5fc3 | 839 | EXPORT_SYMBOL(scsi_eh_finish_cmd); |
1da177e4 LT |
840 | |
841 | /** | |
842 | * scsi_eh_get_sense - Get device sense data. | |
843 | * @work_q: Queue of commands to process. | |
eb44820c | 844 | * @done_q: Queue of processed commands. |
1da177e4 LT |
845 | * |
846 | * Description: | |
847 | * See if we need to request sense information. if so, then get it | |
848 | * now, so we have a better idea of what to do. | |
849 | * | |
850 | * Notes: | |
851 | * This has the unfortunate side effect that if a shost adapter does | |
eb44820c | 852 | * not automatically request sense information, we end up shutting |
1da177e4 LT |
853 | * it down before we request it. |
854 | * | |
855 | * All drivers should request sense information internally these days, | |
856 | * so for now all I have to say is tough noogies if you end up in here. | |
857 | * | |
858 | * XXX: Long term this code should go away, but that needs an audit of | |
859 | * all LLDDs first. | |
dc8875e1 | 860 | */ |
dca84e46 DW |
861 | int scsi_eh_get_sense(struct list_head *work_q, |
862 | struct list_head *done_q) | |
1da177e4 | 863 | { |
937abeaa | 864 | struct scsi_cmnd *scmd, *next; |
1da177e4 LT |
865 | int rtn; |
866 | ||
937abeaa | 867 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 868 | if ((scmd->eh_eflags & SCSI_EH_CANCEL_CMD) || |
1da177e4 LT |
869 | SCSI_SENSE_VALID(scmd)) |
870 | continue; | |
871 | ||
3bf743e7 JG |
872 | SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd, |
873 | "%s: requesting sense\n", | |
874 | current->comm)); | |
1da177e4 LT |
875 | rtn = scsi_request_sense(scmd); |
876 | if (rtn != SUCCESS) | |
877 | continue; | |
878 | ||
879 | SCSI_LOG_ERROR_RECOVERY(3, printk("sense requested for %p" | |
880 | " result %x\n", scmd, | |
881 | scmd->result)); | |
882 | SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense("bh", scmd)); | |
883 | ||
884 | rtn = scsi_decide_disposition(scmd); | |
885 | ||
886 | /* | |
887 | * if the result was normal, then just pass it along to the | |
888 | * upper level. | |
889 | */ | |
890 | if (rtn == SUCCESS) | |
891 | /* we don't want this command reissued, just | |
892 | * finished with the sense data, so set | |
893 | * retries to the max allowed to ensure it | |
894 | * won't get reissued */ | |
895 | scmd->retries = scmd->allowed; | |
896 | else if (rtn != NEEDS_RETRY) | |
897 | continue; | |
898 | ||
899 | scsi_eh_finish_cmd(scmd, done_q); | |
900 | } | |
901 | ||
902 | return list_empty(work_q); | |
903 | } | |
dca84e46 | 904 | EXPORT_SYMBOL_GPL(scsi_eh_get_sense); |
1da177e4 | 905 | |
1da177e4 LT |
906 | /** |
907 | * scsi_eh_tur - Send TUR to device. | |
eb44820c | 908 | * @scmd: &scsi_cmnd to send TUR |
1da177e4 LT |
909 | * |
910 | * Return value: | |
911 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 912 | */ |
1da177e4 LT |
913 | static int scsi_eh_tur(struct scsi_cmnd *scmd) |
914 | { | |
915 | static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0}; | |
916 | int retry_cnt = 1, rtn; | |
917 | ||
918 | retry_tur: | |
0db99e33 | 919 | rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, SENSE_TIMEOUT, 0); |
1da177e4 | 920 | |
1da177e4 | 921 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd %p rtn %x\n", |
cadbd4a5 | 922 | __func__, scmd, rtn)); |
631c228c CH |
923 | |
924 | switch (rtn) { | |
925 | case NEEDS_RETRY: | |
1da177e4 LT |
926 | if (retry_cnt--) |
927 | goto retry_tur; | |
631c228c CH |
928 | /*FALLTHRU*/ |
929 | case SUCCESS: | |
e47373ec | 930 | return 0; |
631c228c CH |
931 | default: |
932 | return 1; | |
e47373ec | 933 | } |
1da177e4 LT |
934 | } |
935 | ||
936 | /** | |
eb44820c RL |
937 | * scsi_eh_abort_cmds - abort pending commands. |
938 | * @work_q: &list_head for pending commands. | |
939 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
940 | * |
941 | * Decription: | |
942 | * Try and see whether or not it makes sense to try and abort the | |
eb44820c RL |
943 | * running command. This only works out to be the case if we have one |
944 | * command that has timed out. If the command simply failed, it makes | |
1da177e4 LT |
945 | * no sense to try and abort the command, since as far as the shost |
946 | * adapter is concerned, it isn't running. | |
dc8875e1 | 947 | */ |
1da177e4 LT |
948 | static int scsi_eh_abort_cmds(struct list_head *work_q, |
949 | struct list_head *done_q) | |
950 | { | |
937abeaa | 951 | struct scsi_cmnd *scmd, *next; |
1da177e4 LT |
952 | int rtn; |
953 | ||
937abeaa | 954 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 955 | if (!(scmd->eh_eflags & SCSI_EH_CANCEL_CMD)) |
1da177e4 LT |
956 | continue; |
957 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting cmd:" | |
958 | "0x%p\n", current->comm, | |
959 | scmd)); | |
960 | rtn = scsi_try_to_abort_cmd(scmd); | |
2f2eb587 | 961 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
3111b0d1 | 962 | scmd->eh_eflags &= ~SCSI_EH_CANCEL_CMD; |
1da177e4 | 963 | if (!scsi_device_online(scmd->device) || |
2f2eb587 | 964 | rtn == FAST_IO_FAIL || |
1da177e4 LT |
965 | !scsi_eh_tur(scmd)) { |
966 | scsi_eh_finish_cmd(scmd, done_q); | |
967 | } | |
968 | ||
969 | } else | |
970 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting" | |
971 | " cmd failed:" | |
972 | "0x%p\n", | |
973 | current->comm, | |
974 | scmd)); | |
975 | } | |
976 | ||
977 | return list_empty(work_q); | |
978 | } | |
979 | ||
1da177e4 LT |
980 | /** |
981 | * scsi_eh_try_stu - Send START_UNIT to device. | |
eb44820c | 982 | * @scmd: &scsi_cmnd to send START_UNIT |
1da177e4 LT |
983 | * |
984 | * Return value: | |
985 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 986 | */ |
1da177e4 LT |
987 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd) |
988 | { | |
989 | static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0}; | |
1da177e4 | 990 | |
631c228c | 991 | if (scmd->device->allow_restart) { |
ed773e66 BK |
992 | int i, rtn = NEEDS_RETRY; |
993 | ||
994 | for (i = 0; rtn == NEEDS_RETRY && i < 2; i++) | |
9728c081 | 995 | rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0); |
1da177e4 | 996 | |
631c228c CH |
997 | if (rtn == SUCCESS) |
998 | return 0; | |
999 | } | |
1da177e4 | 1000 | |
1da177e4 LT |
1001 | return 1; |
1002 | } | |
1003 | ||
1004 | /** | |
1005 | * scsi_eh_stu - send START_UNIT if needed | |
eb44820c RL |
1006 | * @shost: &scsi host being recovered. |
1007 | * @work_q: &list_head for pending commands. | |
1008 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1009 | * |
1010 | * Notes: | |
1011 | * If commands are failing due to not ready, initializing command required, | |
1012 | * try revalidating the device, which will end up sending a start unit. | |
dc8875e1 | 1013 | */ |
1da177e4 LT |
1014 | static int scsi_eh_stu(struct Scsi_Host *shost, |
1015 | struct list_head *work_q, | |
1016 | struct list_head *done_q) | |
1017 | { | |
937abeaa | 1018 | struct scsi_cmnd *scmd, *stu_scmd, *next; |
1da177e4 LT |
1019 | struct scsi_device *sdev; |
1020 | ||
1021 | shost_for_each_device(sdev, shost) { | |
1022 | stu_scmd = NULL; | |
1023 | list_for_each_entry(scmd, work_q, eh_entry) | |
1024 | if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) && | |
1025 | scsi_check_sense(scmd) == FAILED ) { | |
1026 | stu_scmd = scmd; | |
1027 | break; | |
1028 | } | |
1029 | ||
1030 | if (!stu_scmd) | |
1031 | continue; | |
1032 | ||
1033 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending START_UNIT to sdev:" | |
1034 | " 0x%p\n", current->comm, sdev)); | |
1035 | ||
1036 | if (!scsi_eh_try_stu(stu_scmd)) { | |
1037 | if (!scsi_device_online(sdev) || | |
1038 | !scsi_eh_tur(stu_scmd)) { | |
937abeaa CH |
1039 | list_for_each_entry_safe(scmd, next, |
1040 | work_q, eh_entry) { | |
1da177e4 LT |
1041 | if (scmd->device == sdev) |
1042 | scsi_eh_finish_cmd(scmd, done_q); | |
1043 | } | |
1044 | } | |
1045 | } else { | |
1046 | SCSI_LOG_ERROR_RECOVERY(3, | |
1047 | printk("%s: START_UNIT failed to sdev:" | |
1048 | " 0x%p\n", current->comm, sdev)); | |
1049 | } | |
1050 | } | |
1051 | ||
1052 | return list_empty(work_q); | |
1053 | } | |
1054 | ||
1055 | ||
1056 | /** | |
1057 | * scsi_eh_bus_device_reset - send bdr if needed | |
1058 | * @shost: scsi host being recovered. | |
eb44820c RL |
1059 | * @work_q: &list_head for pending commands. |
1060 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1061 | * |
1062 | * Notes: | |
eb44820c | 1063 | * Try a bus device reset. Still, look to see whether we have multiple |
1da177e4 LT |
1064 | * devices that are jammed or not - if we have multiple devices, it |
1065 | * makes no sense to try bus_device_reset - we really would need to try | |
1066 | * a bus_reset instead. | |
dc8875e1 | 1067 | */ |
1da177e4 LT |
1068 | static int scsi_eh_bus_device_reset(struct Scsi_Host *shost, |
1069 | struct list_head *work_q, | |
1070 | struct list_head *done_q) | |
1071 | { | |
937abeaa | 1072 | struct scsi_cmnd *scmd, *bdr_scmd, *next; |
1da177e4 LT |
1073 | struct scsi_device *sdev; |
1074 | int rtn; | |
1075 | ||
1076 | shost_for_each_device(sdev, shost) { | |
1077 | bdr_scmd = NULL; | |
1078 | list_for_each_entry(scmd, work_q, eh_entry) | |
1079 | if (scmd->device == sdev) { | |
1080 | bdr_scmd = scmd; | |
1081 | break; | |
1082 | } | |
1083 | ||
1084 | if (!bdr_scmd) | |
1085 | continue; | |
1086 | ||
1087 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BDR sdev:" | |
1088 | " 0x%p\n", current->comm, | |
1089 | sdev)); | |
1090 | rtn = scsi_try_bus_device_reset(bdr_scmd); | |
2f2eb587 | 1091 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
1da177e4 | 1092 | if (!scsi_device_online(sdev) || |
2f2eb587 | 1093 | rtn == FAST_IO_FAIL || |
1da177e4 | 1094 | !scsi_eh_tur(bdr_scmd)) { |
937abeaa CH |
1095 | list_for_each_entry_safe(scmd, next, |
1096 | work_q, eh_entry) { | |
1da177e4 LT |
1097 | if (scmd->device == sdev) |
1098 | scsi_eh_finish_cmd(scmd, | |
1099 | done_q); | |
1100 | } | |
1101 | } | |
1102 | } else { | |
1103 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BDR" | |
1104 | " failed sdev:" | |
1105 | "0x%p\n", | |
1106 | current->comm, | |
1107 | sdev)); | |
1108 | } | |
1109 | } | |
1110 | ||
1111 | return list_empty(work_q); | |
1112 | } | |
1113 | ||
30bd7df8 MC |
1114 | /** |
1115 | * scsi_eh_target_reset - send target reset if needed | |
1116 | * @shost: scsi host being recovered. | |
1117 | * @work_q: &list_head for pending commands. | |
1118 | * @done_q: &list_head for processed commands. | |
1119 | * | |
1120 | * Notes: | |
1121 | * Try a target reset. | |
1122 | */ | |
1123 | static int scsi_eh_target_reset(struct Scsi_Host *shost, | |
1124 | struct list_head *work_q, | |
1125 | struct list_head *done_q) | |
1126 | { | |
1127 | struct scsi_cmnd *scmd, *tgtr_scmd, *next; | |
c82dc88d | 1128 | unsigned int id = 0; |
30bd7df8 MC |
1129 | int rtn; |
1130 | ||
c82dc88d | 1131 | do { |
30bd7df8 MC |
1132 | tgtr_scmd = NULL; |
1133 | list_for_each_entry(scmd, work_q, eh_entry) { | |
1134 | if (id == scmd_id(scmd)) { | |
1135 | tgtr_scmd = scmd; | |
1136 | break; | |
1137 | } | |
1138 | } | |
c82dc88d JB |
1139 | if (!tgtr_scmd) { |
1140 | /* not one exactly equal; find the next highest */ | |
1141 | list_for_each_entry(scmd, work_q, eh_entry) { | |
1142 | if (scmd_id(scmd) > id && | |
1143 | (!tgtr_scmd || | |
1144 | scmd_id(tgtr_scmd) > scmd_id(scmd))) | |
1145 | tgtr_scmd = scmd; | |
1146 | } | |
1147 | } | |
30bd7df8 | 1148 | if (!tgtr_scmd) |
c82dc88d JB |
1149 | /* no more commands, that's it */ |
1150 | break; | |
30bd7df8 MC |
1151 | |
1152 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending target reset " | |
1153 | "to target %d\n", | |
1154 | current->comm, id)); | |
1155 | rtn = scsi_try_target_reset(tgtr_scmd); | |
2f2eb587 | 1156 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
30bd7df8 MC |
1157 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1158 | if (id == scmd_id(scmd)) | |
1159 | if (!scsi_device_online(scmd->device) || | |
2f2eb587 | 1160 | rtn == FAST_IO_FAIL || |
30bd7df8 MC |
1161 | !scsi_eh_tur(tgtr_scmd)) |
1162 | scsi_eh_finish_cmd(scmd, | |
1163 | done_q); | |
1164 | } | |
1165 | } else | |
1166 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Target reset" | |
1167 | " failed target: " | |
1168 | "%d\n", | |
1169 | current->comm, id)); | |
c82dc88d JB |
1170 | id++; |
1171 | } while(id != 0); | |
30bd7df8 MC |
1172 | |
1173 | return list_empty(work_q); | |
1174 | } | |
1175 | ||
1da177e4 LT |
1176 | /** |
1177 | * scsi_eh_bus_reset - send a bus reset | |
eb44820c RL |
1178 | * @shost: &scsi host being recovered. |
1179 | * @work_q: &list_head for pending commands. | |
1180 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1181 | */ |
1da177e4 LT |
1182 | static int scsi_eh_bus_reset(struct Scsi_Host *shost, |
1183 | struct list_head *work_q, | |
1184 | struct list_head *done_q) | |
1185 | { | |
937abeaa | 1186 | struct scsi_cmnd *scmd, *chan_scmd, *next; |
1da177e4 LT |
1187 | unsigned int channel; |
1188 | int rtn; | |
1189 | ||
1190 | /* | |
1191 | * we really want to loop over the various channels, and do this on | |
1192 | * a channel by channel basis. we should also check to see if any | |
1193 | * of the failed commands are on soft_reset devices, and if so, skip | |
1194 | * the reset. | |
1195 | */ | |
1196 | ||
1197 | for (channel = 0; channel <= shost->max_channel; channel++) { | |
1198 | chan_scmd = NULL; | |
1199 | list_for_each_entry(scmd, work_q, eh_entry) { | |
422c0d61 | 1200 | if (channel == scmd_channel(scmd)) { |
1da177e4 LT |
1201 | chan_scmd = scmd; |
1202 | break; | |
1203 | /* | |
1204 | * FIXME add back in some support for | |
1205 | * soft_reset devices. | |
1206 | */ | |
1207 | } | |
1208 | } | |
1209 | ||
1210 | if (!chan_scmd) | |
1211 | continue; | |
1212 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BRST chan:" | |
1213 | " %d\n", current->comm, | |
1214 | channel)); | |
1215 | rtn = scsi_try_bus_reset(chan_scmd); | |
2f2eb587 | 1216 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
937abeaa | 1217 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
422c0d61 | 1218 | if (channel == scmd_channel(scmd)) |
1da177e4 | 1219 | if (!scsi_device_online(scmd->device) || |
2f2eb587 | 1220 | rtn == FAST_IO_FAIL || |
1da177e4 LT |
1221 | !scsi_eh_tur(scmd)) |
1222 | scsi_eh_finish_cmd(scmd, | |
1223 | done_q); | |
1224 | } | |
1225 | } else { | |
1226 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BRST" | |
1227 | " failed chan: %d\n", | |
1228 | current->comm, | |
1229 | channel)); | |
1230 | } | |
1231 | } | |
1232 | return list_empty(work_q); | |
1233 | } | |
1234 | ||
1235 | /** | |
1236 | * scsi_eh_host_reset - send a host reset | |
1237 | * @work_q: list_head for processed commands. | |
1238 | * @done_q: list_head for processed commands. | |
dc8875e1 | 1239 | */ |
1da177e4 LT |
1240 | static int scsi_eh_host_reset(struct list_head *work_q, |
1241 | struct list_head *done_q) | |
1242 | { | |
937abeaa | 1243 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1244 | int rtn; |
1da177e4 LT |
1245 | |
1246 | if (!list_empty(work_q)) { | |
1247 | scmd = list_entry(work_q->next, | |
1248 | struct scsi_cmnd, eh_entry); | |
1249 | ||
1250 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending HRST\n" | |
1251 | , current->comm)); | |
1252 | ||
1253 | rtn = scsi_try_host_reset(scmd); | |
2f2eb587 | 1254 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
937abeaa | 1255 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1da177e4 | 1256 | if (!scsi_device_online(scmd->device) || |
2f2eb587 | 1257 | rtn == FAST_IO_FAIL || |
1da177e4 LT |
1258 | (!scsi_eh_try_stu(scmd) && !scsi_eh_tur(scmd)) || |
1259 | !scsi_eh_tur(scmd)) | |
1260 | scsi_eh_finish_cmd(scmd, done_q); | |
1261 | } | |
1262 | } else { | |
1263 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: HRST" | |
1264 | " failed\n", | |
1265 | current->comm)); | |
1266 | } | |
1267 | } | |
1268 | return list_empty(work_q); | |
1269 | } | |
1270 | ||
1271 | /** | |
1272 | * scsi_eh_offline_sdevs - offline scsi devices that fail to recover | |
1273 | * @work_q: list_head for processed commands. | |
1274 | * @done_q: list_head for processed commands. | |
dc8875e1 | 1275 | */ |
1da177e4 LT |
1276 | static void scsi_eh_offline_sdevs(struct list_head *work_q, |
1277 | struct list_head *done_q) | |
1278 | { | |
937abeaa | 1279 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1280 | |
937abeaa | 1281 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
31765d7d MW |
1282 | sdev_printk(KERN_INFO, scmd->device, "Device offlined - " |
1283 | "not ready after error recovery\n"); | |
1da177e4 | 1284 | scsi_device_set_state(scmd->device, SDEV_OFFLINE); |
3111b0d1 | 1285 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) { |
1da177e4 LT |
1286 | /* |
1287 | * FIXME: Handle lost cmds. | |
1288 | */ | |
1289 | } | |
1290 | scsi_eh_finish_cmd(scmd, done_q); | |
1291 | } | |
1292 | return; | |
1293 | } | |
1294 | ||
4a27446f MC |
1295 | /** |
1296 | * scsi_noretry_cmd - determinte if command should be failed fast | |
1297 | * @scmd: SCSI cmd to examine. | |
1298 | */ | |
1299 | int scsi_noretry_cmd(struct scsi_cmnd *scmd) | |
1300 | { | |
1301 | switch (host_byte(scmd->result)) { | |
1302 | case DID_OK: | |
1303 | break; | |
1304 | case DID_BUS_BUSY: | |
33659ebb | 1305 | return (scmd->request->cmd_flags & REQ_FAILFAST_TRANSPORT); |
4a27446f | 1306 | case DID_PARITY: |
33659ebb | 1307 | return (scmd->request->cmd_flags & REQ_FAILFAST_DEV); |
4a27446f MC |
1308 | case DID_ERROR: |
1309 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1310 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1311 | return 0; | |
1312 | /* fall through */ | |
1313 | case DID_SOFT_ERROR: | |
33659ebb | 1314 | return (scmd->request->cmd_flags & REQ_FAILFAST_DRIVER); |
4a27446f MC |
1315 | } |
1316 | ||
1317 | switch (status_byte(scmd->result)) { | |
1318 | case CHECK_CONDITION: | |
1319 | /* | |
1320 | * assume caller has checked sense and determinted | |
1321 | * the check condition was retryable. | |
1322 | */ | |
e96f6abe FT |
1323 | if (scmd->request->cmd_flags & REQ_FAILFAST_DEV || |
1324 | scmd->request->cmd_type == REQ_TYPE_BLOCK_PC) | |
1325 | return 1; | |
4a27446f MC |
1326 | } |
1327 | ||
1328 | return 0; | |
1329 | } | |
1330 | ||
1da177e4 LT |
1331 | /** |
1332 | * scsi_decide_disposition - Disposition a cmd on return from LLD. | |
1333 | * @scmd: SCSI cmd to examine. | |
1334 | * | |
1335 | * Notes: | |
1336 | * This is *only* called when we are examining the status after sending | |
1337 | * out the actual data command. any commands that are queued for error | |
1338 | * recovery (e.g. test_unit_ready) do *not* come through here. | |
1339 | * | |
1340 | * When this routine returns failed, it means the error handler thread | |
1341 | * is woken. In cases where the error code indicates an error that | |
1342 | * doesn't require the error handler read (i.e. we don't need to | |
1343 | * abort/reset), this function should return SUCCESS. | |
dc8875e1 | 1344 | */ |
1da177e4 LT |
1345 | int scsi_decide_disposition(struct scsi_cmnd *scmd) |
1346 | { | |
1347 | int rtn; | |
1348 | ||
1349 | /* | |
1350 | * if the device is offline, then we clearly just pass the result back | |
1351 | * up to the top level. | |
1352 | */ | |
1353 | if (!scsi_device_online(scmd->device)) { | |
1354 | SCSI_LOG_ERROR_RECOVERY(5, printk("%s: device offline - report" | |
1355 | " as SUCCESS\n", | |
cadbd4a5 | 1356 | __func__)); |
1da177e4 LT |
1357 | return SUCCESS; |
1358 | } | |
1359 | ||
1360 | /* | |
1361 | * first check the host byte, to see if there is anything in there | |
1362 | * that would indicate what we need to do. | |
1363 | */ | |
1364 | switch (host_byte(scmd->result)) { | |
1365 | case DID_PASSTHROUGH: | |
1366 | /* | |
1367 | * no matter what, pass this through to the upper layer. | |
1368 | * nuke this special code so that it looks like we are saying | |
1369 | * did_ok. | |
1370 | */ | |
1371 | scmd->result &= 0xff00ffff; | |
1372 | return SUCCESS; | |
1373 | case DID_OK: | |
1374 | /* | |
1375 | * looks good. drop through, and check the next byte. | |
1376 | */ | |
1377 | break; | |
1378 | case DID_NO_CONNECT: | |
1379 | case DID_BAD_TARGET: | |
1380 | case DID_ABORT: | |
1381 | /* | |
1382 | * note - this means that we just report the status back | |
1383 | * to the top level driver, not that we actually think | |
1384 | * that it indicates SUCCESS. | |
1385 | */ | |
1386 | return SUCCESS; | |
1387 | /* | |
1388 | * when the low level driver returns did_soft_error, | |
1389 | * it is responsible for keeping an internal retry counter | |
1390 | * in order to avoid endless loops (db) | |
1391 | * | |
1392 | * actually this is a bug in this function here. we should | |
1393 | * be mindful of the maximum number of retries specified | |
1394 | * and not get stuck in a loop. | |
1395 | */ | |
1396 | case DID_SOFT_ERROR: | |
1397 | goto maybe_retry; | |
1398 | case DID_IMM_RETRY: | |
1399 | return NEEDS_RETRY; | |
1400 | ||
bf341919 JB |
1401 | case DID_REQUEUE: |
1402 | return ADD_TO_MLQUEUE; | |
a4dfaa6f MC |
1403 | case DID_TRANSPORT_DISRUPTED: |
1404 | /* | |
1405 | * LLD/transport was disrupted during processing of the IO. | |
1406 | * The transport class is now blocked/blocking, | |
1407 | * and the transport will decide what to do with the IO | |
939c2288 MC |
1408 | * based on its timers and recovery capablilities if |
1409 | * there are enough retries. | |
a4dfaa6f | 1410 | */ |
939c2288 | 1411 | goto maybe_retry; |
a4dfaa6f MC |
1412 | case DID_TRANSPORT_FAILFAST: |
1413 | /* | |
1414 | * The transport decided to failfast the IO (most likely | |
1415 | * the fast io fail tmo fired), so send IO directly upwards. | |
1416 | */ | |
1417 | return SUCCESS; | |
1da177e4 LT |
1418 | case DID_ERROR: |
1419 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1420 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1421 | /* | |
1422 | * execute reservation conflict processing code | |
1423 | * lower down | |
1424 | */ | |
1425 | break; | |
1426 | /* fallthrough */ | |
1427 | ||
1428 | case DID_BUS_BUSY: | |
1429 | case DID_PARITY: | |
1430 | goto maybe_retry; | |
1431 | case DID_TIME_OUT: | |
1432 | /* | |
1433 | * when we scan the bus, we get timeout messages for | |
1434 | * these commands if there is no device available. | |
1435 | * other hosts report did_no_connect for the same thing. | |
1436 | */ | |
1437 | if ((scmd->cmnd[0] == TEST_UNIT_READY || | |
1438 | scmd->cmnd[0] == INQUIRY)) { | |
1439 | return SUCCESS; | |
1440 | } else { | |
1441 | return FAILED; | |
1442 | } | |
1443 | case DID_RESET: | |
1444 | return SUCCESS; | |
1445 | default: | |
1446 | return FAILED; | |
1447 | } | |
1448 | ||
1449 | /* | |
1450 | * next, check the message byte. | |
1451 | */ | |
1452 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
1453 | return FAILED; | |
1454 | ||
1455 | /* | |
1456 | * check the status byte to see if this indicates anything special. | |
1457 | */ | |
1458 | switch (status_byte(scmd->result)) { | |
1459 | case QUEUE_FULL: | |
42a6a918 | 1460 | scsi_handle_queue_full(scmd->device); |
1da177e4 LT |
1461 | /* |
1462 | * the case of trying to send too many commands to a | |
1463 | * tagged queueing device. | |
1464 | */ | |
1465 | case BUSY: | |
1466 | /* | |
1467 | * device can't talk to us at the moment. Should only | |
1468 | * occur (SAM-3) when the task queue is empty, so will cause | |
1469 | * the empty queue handling to trigger a stall in the | |
1470 | * device. | |
1471 | */ | |
1472 | return ADD_TO_MLQUEUE; | |
1473 | case GOOD: | |
4a84067d | 1474 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 | 1475 | case COMMAND_TERMINATED: |
1da177e4 | 1476 | return SUCCESS; |
a9b589d9 VB |
1477 | case TASK_ABORTED: |
1478 | goto maybe_retry; | |
1da177e4 LT |
1479 | case CHECK_CONDITION: |
1480 | rtn = scsi_check_sense(scmd); | |
1481 | if (rtn == NEEDS_RETRY) | |
1482 | goto maybe_retry; | |
1483 | /* if rtn == FAILED, we have no sense information; | |
1484 | * returning FAILED will wake the error handler thread | |
1485 | * to collect the sense and redo the decide | |
1486 | * disposition */ | |
1487 | return rtn; | |
1488 | case CONDITION_GOOD: | |
1489 | case INTERMEDIATE_GOOD: | |
1490 | case INTERMEDIATE_C_GOOD: | |
1491 | case ACA_ACTIVE: | |
1492 | /* | |
1493 | * who knows? FIXME(eric) | |
1494 | */ | |
1495 | return SUCCESS; | |
1496 | ||
1497 | case RESERVATION_CONFLICT: | |
9ccfc756 JB |
1498 | sdev_printk(KERN_INFO, scmd->device, |
1499 | "reservation conflict\n"); | |
1da177e4 LT |
1500 | return SUCCESS; /* causes immediate i/o error */ |
1501 | default: | |
1502 | return FAILED; | |
1503 | } | |
1504 | return FAILED; | |
1505 | ||
1506 | maybe_retry: | |
1507 | ||
1508 | /* we requeue for retry because the error was retryable, and | |
1509 | * the request was not marked fast fail. Note that above, | |
1510 | * even if the request is marked fast fail, we still requeue | |
1511 | * for queue congestion conditions (QUEUE_FULL or BUSY) */ | |
8884efab | 1512 | if ((++scmd->retries) <= scmd->allowed |
4a27446f | 1513 | && !scsi_noretry_cmd(scmd)) { |
1da177e4 LT |
1514 | return NEEDS_RETRY; |
1515 | } else { | |
1516 | /* | |
1517 | * no more retries - report this one back to upper level. | |
1518 | */ | |
1519 | return SUCCESS; | |
1520 | } | |
1521 | } | |
1522 | ||
f078727b FT |
1523 | static void eh_lock_door_done(struct request *req, int uptodate) |
1524 | { | |
1525 | __blk_put_request(req->q, req); | |
1526 | } | |
1527 | ||
1da177e4 LT |
1528 | /** |
1529 | * scsi_eh_lock_door - Prevent medium removal for the specified device | |
1530 | * @sdev: SCSI device to prevent medium removal | |
1531 | * | |
1532 | * Locking: | |
91bc31fb | 1533 | * We must be called from process context. |
1da177e4 LT |
1534 | * |
1535 | * Notes: | |
1536 | * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the | |
1537 | * head of the devices request queue, and continue. | |
dc8875e1 | 1538 | */ |
1da177e4 LT |
1539 | static void scsi_eh_lock_door(struct scsi_device *sdev) |
1540 | { | |
f078727b | 1541 | struct request *req; |
1da177e4 | 1542 | |
91bc31fb JB |
1543 | /* |
1544 | * blk_get_request with GFP_KERNEL (__GFP_WAIT) sleeps until a | |
1545 | * request becomes available | |
1546 | */ | |
f078727b | 1547 | req = blk_get_request(sdev->request_queue, READ, GFP_KERNEL); |
1da177e4 | 1548 | |
f078727b FT |
1549 | req->cmd[0] = ALLOW_MEDIUM_REMOVAL; |
1550 | req->cmd[1] = 0; | |
1551 | req->cmd[2] = 0; | |
1552 | req->cmd[3] = 0; | |
1553 | req->cmd[4] = SCSI_REMOVAL_PREVENT; | |
1554 | req->cmd[5] = 0; | |
1da177e4 | 1555 | |
f078727b FT |
1556 | req->cmd_len = COMMAND_SIZE(req->cmd[0]); |
1557 | ||
1558 | req->cmd_type = REQ_TYPE_BLOCK_PC; | |
1559 | req->cmd_flags |= REQ_QUIET; | |
1560 | req->timeout = 10 * HZ; | |
1561 | req->retries = 5; | |
1562 | ||
1563 | blk_execute_rq_nowait(req->q, NULL, req, 1, eh_lock_door_done); | |
1564 | } | |
1da177e4 LT |
1565 | |
1566 | /** | |
1567 | * scsi_restart_operations - restart io operations to the specified host. | |
1568 | * @shost: Host we are restarting. | |
1569 | * | |
1570 | * Notes: | |
1571 | * When we entered the error handler, we blocked all further i/o to | |
1572 | * this device. we need to 'reverse' this process. | |
dc8875e1 | 1573 | */ |
1da177e4 LT |
1574 | static void scsi_restart_operations(struct Scsi_Host *shost) |
1575 | { | |
1576 | struct scsi_device *sdev; | |
939647ee | 1577 | unsigned long flags; |
1da177e4 LT |
1578 | |
1579 | /* | |
1580 | * If the door was locked, we need to insert a door lock request | |
1581 | * onto the head of the SCSI request queue for the device. There | |
1582 | * is no point trying to lock the door of an off-line device. | |
1583 | */ | |
1584 | shost_for_each_device(sdev, shost) { | |
1585 | if (scsi_device_online(sdev) && sdev->locked) | |
1586 | scsi_eh_lock_door(sdev); | |
1587 | } | |
1588 | ||
1589 | /* | |
1590 | * next free up anything directly waiting upon the host. this | |
1591 | * will be requests for character device operations, and also for | |
1592 | * ioctls to queued block devices. | |
1593 | */ | |
1594 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: waking up host to restart\n", | |
cadbd4a5 | 1595 | __func__)); |
1da177e4 | 1596 | |
939647ee JB |
1597 | spin_lock_irqsave(shost->host_lock, flags); |
1598 | if (scsi_host_set_state(shost, SHOST_RUNNING)) | |
1599 | if (scsi_host_set_state(shost, SHOST_CANCEL)) | |
1600 | BUG_ON(scsi_host_set_state(shost, SHOST_DEL)); | |
1601 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
1602 | |
1603 | wake_up(&shost->host_wait); | |
1604 | ||
1605 | /* | |
1606 | * finally we need to re-initiate requests that may be pending. we will | |
1607 | * have had everything blocked while error handling is taking place, and | |
1608 | * now that error recovery is done, we will need to ensure that these | |
1609 | * requests are started. | |
1610 | */ | |
1611 | scsi_run_host_queues(shost); | |
1612 | } | |
1613 | ||
1614 | /** | |
1615 | * scsi_eh_ready_devs - check device ready state and recover if not. | |
1616 | * @shost: host to be recovered. | |
eb44820c RL |
1617 | * @work_q: &list_head for pending commands. |
1618 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1619 | */ |
dca84e46 DW |
1620 | void scsi_eh_ready_devs(struct Scsi_Host *shost, |
1621 | struct list_head *work_q, | |
1622 | struct list_head *done_q) | |
1da177e4 LT |
1623 | { |
1624 | if (!scsi_eh_stu(shost, work_q, done_q)) | |
1625 | if (!scsi_eh_bus_device_reset(shost, work_q, done_q)) | |
30bd7df8 MC |
1626 | if (!scsi_eh_target_reset(shost, work_q, done_q)) |
1627 | if (!scsi_eh_bus_reset(shost, work_q, done_q)) | |
1628 | if (!scsi_eh_host_reset(work_q, done_q)) | |
1629 | scsi_eh_offline_sdevs(work_q, | |
1630 | done_q); | |
1da177e4 | 1631 | } |
dca84e46 | 1632 | EXPORT_SYMBOL_GPL(scsi_eh_ready_devs); |
1da177e4 LT |
1633 | |
1634 | /** | |
1635 | * scsi_eh_flush_done_q - finish processed commands or retry them. | |
1636 | * @done_q: list_head of processed commands. | |
dc8875e1 | 1637 | */ |
041c5fc3 | 1638 | void scsi_eh_flush_done_q(struct list_head *done_q) |
1da177e4 | 1639 | { |
937abeaa | 1640 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1641 | |
937abeaa CH |
1642 | list_for_each_entry_safe(scmd, next, done_q, eh_entry) { |
1643 | list_del_init(&scmd->eh_entry); | |
1da177e4 | 1644 | if (scsi_device_online(scmd->device) && |
4a27446f | 1645 | !scsi_noretry_cmd(scmd) && |
8884efab | 1646 | (++scmd->retries <= scmd->allowed)) { |
1da177e4 LT |
1647 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush" |
1648 | " retry cmd: %p\n", | |
1649 | current->comm, | |
1650 | scmd)); | |
1651 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); | |
1652 | } else { | |
793698ce PM |
1653 | /* |
1654 | * If just we got sense for the device (called | |
1655 | * scsi_eh_get_sense), scmd->result is already | |
1656 | * set, do not set DRIVER_TIMEOUT. | |
1657 | */ | |
1da177e4 LT |
1658 | if (!scmd->result) |
1659 | scmd->result |= (DRIVER_TIMEOUT << 24); | |
1660 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush finish" | |
1661 | " cmd: %p\n", | |
1662 | current->comm, scmd)); | |
1663 | scsi_finish_command(scmd); | |
1664 | } | |
1665 | } | |
1666 | } | |
041c5fc3 | 1667 | EXPORT_SYMBOL(scsi_eh_flush_done_q); |
1da177e4 LT |
1668 | |
1669 | /** | |
1670 | * scsi_unjam_host - Attempt to fix a host which has a cmd that failed. | |
1671 | * @shost: Host to unjam. | |
1672 | * | |
1673 | * Notes: | |
1674 | * When we come in here, we *know* that all commands on the bus have | |
1675 | * either completed, failed or timed out. we also know that no further | |
1676 | * commands are being sent to the host, so things are relatively quiet | |
1677 | * and we have freedom to fiddle with things as we wish. | |
1678 | * | |
1679 | * This is only the *default* implementation. it is possible for | |
1680 | * individual drivers to supply their own version of this function, and | |
1681 | * if the maintainer wishes to do this, it is strongly suggested that | |
1682 | * this function be taken as a template and modified. this function | |
1683 | * was designed to correctly handle problems for about 95% of the | |
1684 | * different cases out there, and it should always provide at least a | |
1685 | * reasonable amount of error recovery. | |
1686 | * | |
1687 | * Any command marked 'failed' or 'timeout' must eventually have | |
1688 | * scsi_finish_cmd() called for it. we do all of the retry stuff | |
1689 | * here, so when we restart the host after we return it should have an | |
1690 | * empty queue. | |
dc8875e1 | 1691 | */ |
1da177e4 LT |
1692 | static void scsi_unjam_host(struct Scsi_Host *shost) |
1693 | { | |
1694 | unsigned long flags; | |
1695 | LIST_HEAD(eh_work_q); | |
1696 | LIST_HEAD(eh_done_q); | |
1697 | ||
1698 | spin_lock_irqsave(shost->host_lock, flags); | |
1699 | list_splice_init(&shost->eh_cmd_q, &eh_work_q); | |
1700 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1701 | ||
1702 | SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost, &eh_work_q)); | |
1703 | ||
1704 | if (!scsi_eh_get_sense(&eh_work_q, &eh_done_q)) | |
1705 | if (!scsi_eh_abort_cmds(&eh_work_q, &eh_done_q)) | |
1706 | scsi_eh_ready_devs(shost, &eh_work_q, &eh_done_q); | |
1707 | ||
1708 | scsi_eh_flush_done_q(&eh_done_q); | |
1709 | } | |
1710 | ||
1711 | /** | |
ad42eb1b | 1712 | * scsi_error_handler - SCSI error handler thread |
1da177e4 LT |
1713 | * @data: Host for which we are running. |
1714 | * | |
1715 | * Notes: | |
ad42eb1b CH |
1716 | * This is the main error handling loop. This is run as a kernel thread |
1717 | * for every SCSI host and handles all error handling activity. | |
dc8875e1 | 1718 | */ |
1da177e4 LT |
1719 | int scsi_error_handler(void *data) |
1720 | { | |
ad42eb1b | 1721 | struct Scsi_Host *shost = data; |
1da177e4 | 1722 | |
1da177e4 | 1723 | /* |
ad42eb1b CH |
1724 | * We use TASK_INTERRUPTIBLE so that the thread is not |
1725 | * counted against the load average as a running process. | |
1726 | * We never actually get interrupted because kthread_run | |
c03264a7 | 1727 | * disables signal delivery for the created thread. |
1da177e4 | 1728 | */ |
3ed7a470 JB |
1729 | set_current_state(TASK_INTERRUPTIBLE); |
1730 | while (!kthread_should_stop()) { | |
ee7863bc | 1731 | if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) || |
3ed7a470 | 1732 | shost->host_failed != shost->host_busy) { |
ad42eb1b CH |
1733 | SCSI_LOG_ERROR_RECOVERY(1, |
1734 | printk("Error handler scsi_eh_%d sleeping\n", | |
1735 | shost->host_no)); | |
3ed7a470 JB |
1736 | schedule(); |
1737 | set_current_state(TASK_INTERRUPTIBLE); | |
1738 | continue; | |
1739 | } | |
1da177e4 | 1740 | |
3ed7a470 | 1741 | __set_current_state(TASK_RUNNING); |
ad42eb1b CH |
1742 | SCSI_LOG_ERROR_RECOVERY(1, |
1743 | printk("Error handler scsi_eh_%d waking up\n", | |
1744 | shost->host_no)); | |
1da177e4 | 1745 | |
1da177e4 LT |
1746 | /* |
1747 | * We have a host that is failing for some reason. Figure out | |
1748 | * what we need to do to get it up and online again (if we can). | |
1749 | * If we fail, we end up taking the thing offline. | |
1750 | */ | |
bc4f2401 AS |
1751 | if (scsi_autopm_get_host(shost) != 0) { |
1752 | SCSI_LOG_ERROR_RECOVERY(1, | |
1753 | printk(KERN_ERR "Error handler scsi_eh_%d " | |
1754 | "unable to autoresume\n", | |
1755 | shost->host_no)); | |
1756 | continue; | |
1757 | } | |
1758 | ||
9227c33d CH |
1759 | if (shost->transportt->eh_strategy_handler) |
1760 | shost->transportt->eh_strategy_handler(shost); | |
1da177e4 LT |
1761 | else |
1762 | scsi_unjam_host(shost); | |
1763 | ||
1da177e4 LT |
1764 | /* |
1765 | * Note - if the above fails completely, the action is to take | |
1766 | * individual devices offline and flush the queue of any | |
1767 | * outstanding requests that may have been pending. When we | |
1768 | * restart, we restart any I/O to any other devices on the bus | |
1769 | * which are still online. | |
1770 | */ | |
1771 | scsi_restart_operations(shost); | |
bc4f2401 | 1772 | scsi_autopm_put_host(shost); |
3ed7a470 | 1773 | set_current_state(TASK_INTERRUPTIBLE); |
1da177e4 | 1774 | } |
461a0ffb SR |
1775 | __set_current_state(TASK_RUNNING); |
1776 | ||
ad42eb1b CH |
1777 | SCSI_LOG_ERROR_RECOVERY(1, |
1778 | printk("Error handler scsi_eh_%d exiting\n", shost->host_no)); | |
3ed7a470 | 1779 | shost->ehandler = NULL; |
1da177e4 LT |
1780 | return 0; |
1781 | } | |
1782 | ||
1783 | /* | |
1784 | * Function: scsi_report_bus_reset() | |
1785 | * | |
1786 | * Purpose: Utility function used by low-level drivers to report that | |
1787 | * they have observed a bus reset on the bus being handled. | |
1788 | * | |
1789 | * Arguments: shost - Host in question | |
1790 | * channel - channel on which reset was observed. | |
1791 | * | |
1792 | * Returns: Nothing | |
1793 | * | |
1794 | * Lock status: Host lock must be held. | |
1795 | * | |
1796 | * Notes: This only needs to be called if the reset is one which | |
1797 | * originates from an unknown location. Resets originated | |
1798 | * by the mid-level itself don't need to call this, but there | |
1799 | * should be no harm. | |
1800 | * | |
1801 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
1802 | * is properly treated. | |
1803 | */ | |
1804 | void scsi_report_bus_reset(struct Scsi_Host *shost, int channel) | |
1805 | { | |
1806 | struct scsi_device *sdev; | |
1807 | ||
1808 | __shost_for_each_device(sdev, shost) { | |
30bd7df8 MC |
1809 | if (channel == sdev_channel(sdev)) |
1810 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
1811 | } |
1812 | } | |
1813 | EXPORT_SYMBOL(scsi_report_bus_reset); | |
1814 | ||
1815 | /* | |
1816 | * Function: scsi_report_device_reset() | |
1817 | * | |
1818 | * Purpose: Utility function used by low-level drivers to report that | |
1819 | * they have observed a device reset on the device being handled. | |
1820 | * | |
1821 | * Arguments: shost - Host in question | |
1822 | * channel - channel on which reset was observed | |
1823 | * target - target on which reset was observed | |
1824 | * | |
1825 | * Returns: Nothing | |
1826 | * | |
1827 | * Lock status: Host lock must be held | |
1828 | * | |
1829 | * Notes: This only needs to be called if the reset is one which | |
1830 | * originates from an unknown location. Resets originated | |
1831 | * by the mid-level itself don't need to call this, but there | |
1832 | * should be no harm. | |
1833 | * | |
1834 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
1835 | * is properly treated. | |
1836 | */ | |
1837 | void scsi_report_device_reset(struct Scsi_Host *shost, int channel, int target) | |
1838 | { | |
1839 | struct scsi_device *sdev; | |
1840 | ||
1841 | __shost_for_each_device(sdev, shost) { | |
422c0d61 | 1842 | if (channel == sdev_channel(sdev) && |
30bd7df8 MC |
1843 | target == sdev_id(sdev)) |
1844 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
1845 | } |
1846 | } | |
1847 | EXPORT_SYMBOL(scsi_report_device_reset); | |
1848 | ||
1849 | static void | |
1850 | scsi_reset_provider_done_command(struct scsi_cmnd *scmd) | |
1851 | { | |
1852 | } | |
1853 | ||
1854 | /* | |
1855 | * Function: scsi_reset_provider | |
1856 | * | |
1857 | * Purpose: Send requested reset to a bus or device at any phase. | |
1858 | * | |
1859 | * Arguments: device - device to send reset to | |
1860 | * flag - reset type (see scsi.h) | |
1861 | * | |
1862 | * Returns: SUCCESS/FAILURE. | |
1863 | * | |
1864 | * Notes: This is used by the SCSI Generic driver to provide | |
1865 | * Bus/Device reset capability. | |
1866 | */ | |
1867 | int | |
1868 | scsi_reset_provider(struct scsi_device *dev, int flag) | |
1869 | { | |
bc4f2401 | 1870 | struct scsi_cmnd *scmd; |
d7a1bb0a | 1871 | struct Scsi_Host *shost = dev->host; |
1da177e4 | 1872 | struct request req; |
d7a1bb0a | 1873 | unsigned long flags; |
1da177e4 LT |
1874 | int rtn; |
1875 | ||
bc4f2401 AS |
1876 | if (scsi_autopm_get_host(shost) < 0) |
1877 | return FAILED; | |
1878 | ||
1879 | scmd = scsi_get_command(dev, GFP_KERNEL); | |
4f54eec8 | 1880 | blk_rq_init(NULL, &req); |
1da177e4 | 1881 | scmd->request = &req; |
b4edcbca | 1882 | |
64a87b24 BH |
1883 | scmd->cmnd = req.cmd; |
1884 | ||
1da177e4 | 1885 | scmd->scsi_done = scsi_reset_provider_done_command; |
30b0c37b | 1886 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
1da177e4 LT |
1887 | |
1888 | scmd->cmd_len = 0; | |
1889 | ||
1890 | scmd->sc_data_direction = DMA_BIDIRECTIONAL; | |
1da177e4 | 1891 | |
d7a1bb0a JS |
1892 | spin_lock_irqsave(shost->host_lock, flags); |
1893 | shost->tmf_in_progress = 1; | |
1894 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1895 | ||
1da177e4 LT |
1896 | switch (flag) { |
1897 | case SCSI_TRY_RESET_DEVICE: | |
1898 | rtn = scsi_try_bus_device_reset(scmd); | |
1899 | if (rtn == SUCCESS) | |
1900 | break; | |
1901 | /* FALLTHROUGH */ | |
30bd7df8 MC |
1902 | case SCSI_TRY_RESET_TARGET: |
1903 | rtn = scsi_try_target_reset(scmd); | |
1904 | if (rtn == SUCCESS) | |
1905 | break; | |
1906 | /* FALLTHROUGH */ | |
1da177e4 LT |
1907 | case SCSI_TRY_RESET_BUS: |
1908 | rtn = scsi_try_bus_reset(scmd); | |
1909 | if (rtn == SUCCESS) | |
1910 | break; | |
1911 | /* FALLTHROUGH */ | |
1912 | case SCSI_TRY_RESET_HOST: | |
1913 | rtn = scsi_try_host_reset(scmd); | |
1914 | break; | |
1915 | default: | |
1916 | rtn = FAILED; | |
1917 | } | |
1918 | ||
d7a1bb0a JS |
1919 | spin_lock_irqsave(shost->host_lock, flags); |
1920 | shost->tmf_in_progress = 0; | |
1921 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1922 | ||
1923 | /* | |
1924 | * be sure to wake up anyone who was sleeping or had their queue | |
1925 | * suspended while we performed the TMF. | |
1926 | */ | |
1927 | SCSI_LOG_ERROR_RECOVERY(3, | |
1928 | printk("%s: waking up host to restart after TMF\n", | |
cadbd4a5 | 1929 | __func__)); |
d7a1bb0a JS |
1930 | |
1931 | wake_up(&shost->host_wait); | |
1932 | ||
1933 | scsi_run_host_queues(shost); | |
1934 | ||
1da177e4 | 1935 | scsi_next_command(scmd); |
bc4f2401 | 1936 | scsi_autopm_put_host(shost); |
1da177e4 LT |
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); |