]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * scsi_error.c Copyright (C) 1997 Eric Youngdale | |
3 | * | |
4 | * SCSI error/timeout handling | |
5 | * Initial versions: Eric Youngdale. Based upon conversations with | |
6 | * Leonard Zubkoff and David Miller at Linux Expo, | |
7 | * ideas originating from all over the place. | |
8 | * | |
9 | * Restructured scsi_unjam_host and associated functions. | |
10 | * September 04, 2002 Mike Anderson (andmike@us.ibm.com) | |
11 | * | |
12 | * Forward port of Russell King's (rmk@arm.linux.org.uk) changes and | |
13 | * minor cleanups. | |
14 | * September 30, 2002 Mike Anderson (andmike@us.ibm.com) | |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/sched.h> | |
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 | ||
2f9e825d | 323 | if (scmd->request->cmd_flags & REQ_HARDBARRIER) |
77a42297 JB |
324 | /* |
325 | * barrier requests should always retry on UA | |
326 | * otherwise block will get a spurious error | |
327 | */ | |
328 | return NEEDS_RETRY; | |
329 | else | |
330 | /* | |
331 | * for normal (non barrier) commands, pass the | |
332 | * UA upwards for a determination in the | |
333 | * completion functions | |
334 | */ | |
335 | return SUCCESS; | |
1da177e4 LT |
336 | |
337 | /* these three are not supported */ | |
338 | case COPY_ABORTED: | |
339 | case VOLUME_OVERFLOW: | |
340 | case MISCOMPARE: | |
341 | return SUCCESS; | |
342 | ||
343 | case MEDIUM_ERROR: | |
fd1b494d LT |
344 | if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */ |
345 | sshdr.asc == 0x13 || /* AMNF DATA FIELD */ | |
346 | sshdr.asc == 0x14) { /* RECORD NOT FOUND */ | |
347 | return SUCCESS; | |
348 | } | |
1da177e4 LT |
349 | return NEEDS_RETRY; |
350 | ||
351 | case HARDWARE_ERROR: | |
352 | if (scmd->device->retry_hwerror) | |
bb0003c1 | 353 | return ADD_TO_MLQUEUE; |
1da177e4 LT |
354 | else |
355 | return SUCCESS; | |
356 | ||
357 | case ILLEGAL_REQUEST: | |
358 | case BLANK_CHECK: | |
359 | case DATA_PROTECT: | |
360 | default: | |
361 | return SUCCESS; | |
362 | } | |
363 | } | |
364 | ||
4a84067d VD |
365 | static void scsi_handle_queue_ramp_up(struct scsi_device *sdev) |
366 | { | |
367 | struct scsi_host_template *sht = sdev->host->hostt; | |
368 | struct scsi_device *tmp_sdev; | |
369 | ||
370 | if (!sht->change_queue_depth || | |
371 | sdev->queue_depth >= sdev->max_queue_depth) | |
372 | return; | |
373 | ||
374 | if (time_before(jiffies, | |
375 | sdev->last_queue_ramp_up + sdev->queue_ramp_up_period)) | |
376 | return; | |
377 | ||
378 | if (time_before(jiffies, | |
379 | sdev->last_queue_full_time + sdev->queue_ramp_up_period)) | |
380 | return; | |
381 | ||
382 | /* | |
383 | * Walk all devices of a target and do | |
384 | * ramp up on them. | |
385 | */ | |
386 | shost_for_each_device(tmp_sdev, sdev->host) { | |
387 | if (tmp_sdev->channel != sdev->channel || | |
388 | tmp_sdev->id != sdev->id || | |
389 | tmp_sdev->queue_depth == sdev->max_queue_depth) | |
390 | continue; | |
391 | /* | |
392 | * call back into LLD to increase queue_depth by one | |
393 | * with ramp up reason code. | |
394 | */ | |
395 | sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1, | |
396 | SCSI_QDEPTH_RAMP_UP); | |
397 | sdev->last_queue_ramp_up = jiffies; | |
398 | } | |
399 | } | |
400 | ||
42a6a918 MC |
401 | static void scsi_handle_queue_full(struct scsi_device *sdev) |
402 | { | |
403 | struct scsi_host_template *sht = sdev->host->hostt; | |
404 | struct scsi_device *tmp_sdev; | |
405 | ||
406 | if (!sht->change_queue_depth) | |
407 | return; | |
408 | ||
409 | shost_for_each_device(tmp_sdev, sdev->host) { | |
410 | if (tmp_sdev->channel != sdev->channel || | |
411 | tmp_sdev->id != sdev->id) | |
412 | continue; | |
413 | /* | |
414 | * We do not know the number of commands that were at | |
415 | * the device when we got the queue full so we start | |
416 | * from the highest possible value and work our way down. | |
417 | */ | |
418 | sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth - 1, | |
419 | SCSI_QDEPTH_QFULL); | |
420 | } | |
421 | } | |
422 | ||
1da177e4 LT |
423 | /** |
424 | * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD. | |
425 | * @scmd: SCSI cmd to examine. | |
426 | * | |
427 | * Notes: | |
428 | * This is *only* called when we are examining the status of commands | |
429 | * queued during error recovery. the main difference here is that we | |
430 | * don't allow for the possibility of retries here, and we are a lot | |
431 | * more restrictive about what we consider acceptable. | |
dc8875e1 | 432 | */ |
1da177e4 LT |
433 | static int scsi_eh_completed_normally(struct scsi_cmnd *scmd) |
434 | { | |
435 | /* | |
436 | * first check the host byte, to see if there is anything in there | |
437 | * that would indicate what we need to do. | |
438 | */ | |
439 | if (host_byte(scmd->result) == DID_RESET) { | |
440 | /* | |
441 | * rats. we are already in the error handler, so we now | |
442 | * get to try and figure out what to do next. if the sense | |
443 | * is valid, we have a pretty good idea of what to do. | |
444 | * if not, we mark it as FAILED. | |
445 | */ | |
446 | return scsi_check_sense(scmd); | |
447 | } | |
448 | if (host_byte(scmd->result) != DID_OK) | |
449 | return FAILED; | |
450 | ||
451 | /* | |
452 | * next, check the message byte. | |
453 | */ | |
454 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
455 | return FAILED; | |
456 | ||
457 | /* | |
458 | * now, check the status byte to see if this indicates | |
459 | * anything special. | |
460 | */ | |
461 | switch (status_byte(scmd->result)) { | |
462 | case GOOD: | |
4a84067d | 463 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 LT |
464 | case COMMAND_TERMINATED: |
465 | return SUCCESS; | |
466 | case CHECK_CONDITION: | |
467 | return scsi_check_sense(scmd); | |
468 | case CONDITION_GOOD: | |
469 | case INTERMEDIATE_GOOD: | |
470 | case INTERMEDIATE_C_GOOD: | |
471 | /* | |
472 | * who knows? FIXME(eric) | |
473 | */ | |
474 | return SUCCESS; | |
5f91bb05 | 475 | case RESERVATION_CONFLICT: |
67110dfd JB |
476 | if (scmd->cmnd[0] == TEST_UNIT_READY) |
477 | /* it is a success, we probed the device and | |
478 | * found it */ | |
479 | return SUCCESS; | |
480 | /* otherwise, we failed to send the command */ | |
481 | return FAILED; | |
1da177e4 | 482 | case QUEUE_FULL: |
42a6a918 MC |
483 | scsi_handle_queue_full(scmd->device); |
484 | /* fall through */ | |
485 | case BUSY: | |
3eb3a928 | 486 | return NEEDS_RETRY; |
1da177e4 LT |
487 | default: |
488 | return FAILED; | |
489 | } | |
490 | return FAILED; | |
491 | } | |
492 | ||
1da177e4 LT |
493 | /** |
494 | * scsi_eh_done - Completion function for error handling. | |
495 | * @scmd: Cmd that is done. | |
dc8875e1 | 496 | */ |
1da177e4 LT |
497 | static void scsi_eh_done(struct scsi_cmnd *scmd) |
498 | { | |
85631672 MR |
499 | struct completion *eh_action; |
500 | ||
7dfdc9a5 CH |
501 | SCSI_LOG_ERROR_RECOVERY(3, |
502 | printk("%s scmd: %p result: %x\n", | |
cadbd4a5 | 503 | __func__, scmd, scmd->result)); |
85631672 MR |
504 | |
505 | eh_action = scmd->device->host->eh_action; | |
506 | if (eh_action) | |
507 | complete(eh_action); | |
1da177e4 LT |
508 | } |
509 | ||
292148f8 BK |
510 | /** |
511 | * scsi_try_host_reset - ask host adapter to reset itself | |
512 | * @scmd: SCSI cmd to send hsot reset. | |
dc8875e1 | 513 | */ |
292148f8 BK |
514 | static int scsi_try_host_reset(struct scsi_cmnd *scmd) |
515 | { | |
516 | unsigned long flags; | |
517 | int rtn; | |
518 | ||
519 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Host RST\n", | |
cadbd4a5 | 520 | __func__)); |
292148f8 BK |
521 | |
522 | if (!scmd->device->host->hostt->eh_host_reset_handler) | |
523 | return FAILED; | |
524 | ||
525 | rtn = scmd->device->host->hostt->eh_host_reset_handler(scmd); | |
526 | ||
527 | if (rtn == SUCCESS) { | |
528 | if (!scmd->device->host->hostt->skip_settle_delay) | |
529 | ssleep(HOST_RESET_SETTLE_TIME); | |
530 | spin_lock_irqsave(scmd->device->host->host_lock, flags); | |
531 | scsi_report_bus_reset(scmd->device->host, | |
532 | scmd_channel(scmd)); | |
533 | spin_unlock_irqrestore(scmd->device->host->host_lock, flags); | |
534 | } | |
535 | ||
536 | return rtn; | |
537 | } | |
538 | ||
539 | /** | |
540 | * scsi_try_bus_reset - ask host to perform a bus reset | |
541 | * @scmd: SCSI cmd to send bus reset. | |
dc8875e1 | 542 | */ |
292148f8 BK |
543 | static int scsi_try_bus_reset(struct scsi_cmnd *scmd) |
544 | { | |
545 | unsigned long flags; | |
546 | int rtn; | |
547 | ||
548 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Bus RST\n", | |
cadbd4a5 | 549 | __func__)); |
292148f8 BK |
550 | |
551 | if (!scmd->device->host->hostt->eh_bus_reset_handler) | |
552 | return FAILED; | |
553 | ||
554 | rtn = scmd->device->host->hostt->eh_bus_reset_handler(scmd); | |
555 | ||
556 | if (rtn == SUCCESS) { | |
557 | if (!scmd->device->host->hostt->skip_settle_delay) | |
558 | ssleep(BUS_RESET_SETTLE_TIME); | |
559 | spin_lock_irqsave(scmd->device->host->host_lock, flags); | |
560 | scsi_report_bus_reset(scmd->device->host, | |
561 | scmd_channel(scmd)); | |
562 | spin_unlock_irqrestore(scmd->device->host->host_lock, flags); | |
563 | } | |
564 | ||
565 | return rtn; | |
566 | } | |
567 | ||
30bd7df8 MC |
568 | static void __scsi_report_device_reset(struct scsi_device *sdev, void *data) |
569 | { | |
570 | sdev->was_reset = 1; | |
571 | sdev->expecting_cc_ua = 1; | |
572 | } | |
573 | ||
574 | /** | |
575 | * scsi_try_target_reset - Ask host to perform a target reset | |
576 | * @scmd: SCSI cmd used to send a target reset | |
577 | * | |
578 | * Notes: | |
579 | * There is no timeout for this operation. if this operation is | |
580 | * unreliable for a given host, then the host itself needs to put a | |
581 | * timer on it, and set the host back to a consistent state prior to | |
582 | * returning. | |
583 | */ | |
584 | static int scsi_try_target_reset(struct scsi_cmnd *scmd) | |
585 | { | |
586 | unsigned long flags; | |
587 | int rtn; | |
588 | ||
589 | if (!scmd->device->host->hostt->eh_target_reset_handler) | |
590 | return FAILED; | |
591 | ||
592 | rtn = scmd->device->host->hostt->eh_target_reset_handler(scmd); | |
593 | if (rtn == SUCCESS) { | |
594 | spin_lock_irqsave(scmd->device->host->host_lock, flags); | |
595 | __starget_for_each_device(scsi_target(scmd->device), NULL, | |
596 | __scsi_report_device_reset); | |
597 | spin_unlock_irqrestore(scmd->device->host->host_lock, flags); | |
598 | } | |
599 | ||
600 | return rtn; | |
601 | } | |
602 | ||
292148f8 BK |
603 | /** |
604 | * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev | |
605 | * @scmd: SCSI cmd used to send BDR | |
606 | * | |
607 | * Notes: | |
608 | * There is no timeout for this operation. if this operation is | |
609 | * unreliable for a given host, then the host itself needs to put a | |
610 | * timer on it, and set the host back to a consistent state prior to | |
611 | * returning. | |
dc8875e1 | 612 | */ |
292148f8 BK |
613 | static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd) |
614 | { | |
615 | int rtn; | |
616 | ||
617 | if (!scmd->device->host->hostt->eh_device_reset_handler) | |
618 | return FAILED; | |
619 | ||
620 | rtn = scmd->device->host->hostt->eh_device_reset_handler(scmd); | |
30bd7df8 MC |
621 | if (rtn == SUCCESS) |
622 | __scsi_report_device_reset(scmd->device, NULL); | |
292148f8 BK |
623 | return rtn; |
624 | } | |
625 | ||
626 | static int __scsi_try_to_abort_cmd(struct scsi_cmnd *scmd) | |
627 | { | |
628 | if (!scmd->device->host->hostt->eh_abort_handler) | |
629 | return FAILED; | |
630 | ||
631 | return scmd->device->host->hostt->eh_abort_handler(scmd); | |
632 | } | |
633 | ||
634 | /** | |
635 | * scsi_try_to_abort_cmd - Ask host to abort a running command. | |
636 | * @scmd: SCSI cmd to abort from Lower Level. | |
637 | * | |
638 | * Notes: | |
639 | * This function will not return until the user's completion function | |
640 | * has been called. there is no timeout on this operation. if the | |
641 | * author of the low-level driver wishes this operation to be timed, | |
642 | * they can provide this facility themselves. helper functions in | |
643 | * scsi_error.c can be supplied to make this easier to do. | |
dc8875e1 | 644 | */ |
292148f8 BK |
645 | static int scsi_try_to_abort_cmd(struct scsi_cmnd *scmd) |
646 | { | |
647 | /* | |
648 | * scsi_done was called just after the command timed out and before | |
649 | * we had a chance to process it. (db) | |
650 | */ | |
651 | if (scmd->serial_number == 0) | |
652 | return SUCCESS; | |
653 | return __scsi_try_to_abort_cmd(scmd); | |
654 | } | |
655 | ||
656 | static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd) | |
657 | { | |
658 | if (__scsi_try_to_abort_cmd(scmd) != SUCCESS) | |
659 | if (scsi_try_bus_device_reset(scmd) != SUCCESS) | |
30bd7df8 MC |
660 | if (scsi_try_target_reset(scmd) != SUCCESS) |
661 | if (scsi_try_bus_reset(scmd) != SUCCESS) | |
662 | scsi_try_host_reset(scmd); | |
292148f8 BK |
663 | } |
664 | ||
1da177e4 | 665 | /** |
e1c23468 | 666 | * scsi_eh_prep_cmnd - Save a scsi command info as part of error recory |
2dc611de | 667 | * @scmd: SCSI command structure to hijack |
e1c23468 | 668 | * @ses: structure to save restore information |
55db6c1b | 669 | * @cmnd: CDB to send. Can be NULL if no new cmnd is needed |
64a87b24 | 670 | * @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB) |
55db6c1b | 671 | * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored) |
2dc611de | 672 | * |
e1c23468 | 673 | * This function is used to save a scsi command information before re-execution |
55db6c1b BH |
674 | * as part of the error recovery process. If @sense_bytes is 0 the command |
675 | * sent must be one that does not transfer any data. If @sense_bytes != 0 | |
676 | * @cmnd is ignored and this functions sets up a REQUEST_SENSE command | |
677 | * and cmnd buffers to read @sense_bytes into @scmd->sense_buffer. | |
dc8875e1 | 678 | */ |
e1c23468 BH |
679 | void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, |
680 | unsigned char *cmnd, int cmnd_size, unsigned sense_bytes) | |
1da177e4 | 681 | { |
f59114b7 | 682 | struct scsi_device *sdev = scmd->device; |
1da177e4 | 683 | |
631c228c CH |
684 | /* |
685 | * We need saved copies of a number of fields - this is because | |
686 | * error handling may need to overwrite these with different values | |
687 | * to run different commands, and once error handling is complete, | |
688 | * we will need to restore these values prior to running the actual | |
689 | * command. | |
690 | */ | |
e1c23468 | 691 | ses->cmd_len = scmd->cmd_len; |
64a87b24 | 692 | ses->cmnd = scmd->cmnd; |
e1c23468 | 693 | ses->data_direction = scmd->sc_data_direction; |
30b0c37b | 694 | ses->sdb = scmd->sdb; |
6f9a35e2 | 695 | ses->next_rq = scmd->request->next_rq; |
e1c23468 | 696 | ses->result = scmd->result; |
12265709 | 697 | ses->underflow = scmd->underflow; |
db007fc5 | 698 | ses->prot_op = scmd->prot_op; |
631c228c | 699 | |
db007fc5 | 700 | scmd->prot_op = SCSI_PROT_NORMAL; |
64a87b24 BH |
701 | scmd->cmnd = ses->eh_cmnd; |
702 | memset(scmd->cmnd, 0, BLK_MAX_CDB); | |
30b0c37b | 703 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
6f9a35e2 | 704 | scmd->request->next_rq = NULL; |
30b0c37b | 705 | |
55db6c1b | 706 | if (sense_bytes) { |
30b0c37b BH |
707 | scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE, |
708 | sense_bytes); | |
e1c23468 | 709 | sg_init_one(&ses->sense_sgl, scmd->sense_buffer, |
30b0c37b BH |
710 | scmd->sdb.length); |
711 | scmd->sdb.table.sgl = &ses->sense_sgl; | |
55db6c1b | 712 | scmd->sc_data_direction = DMA_FROM_DEVICE; |
30b0c37b | 713 | scmd->sdb.table.nents = 1; |
55db6c1b | 714 | scmd->cmnd[0] = REQUEST_SENSE; |
30b0c37b | 715 | scmd->cmnd[4] = scmd->sdb.length; |
55db6c1b | 716 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); |
631c228c | 717 | } else { |
631c228c | 718 | scmd->sc_data_direction = DMA_NONE; |
55db6c1b | 719 | if (cmnd) { |
64a87b24 | 720 | BUG_ON(cmnd_size > BLK_MAX_CDB); |
55db6c1b BH |
721 | memcpy(scmd->cmnd, cmnd, cmnd_size); |
722 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); | |
723 | } | |
631c228c CH |
724 | } |
725 | ||
726 | scmd->underflow = 0; | |
631c228c | 727 | |
55db6c1b | 728 | if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN) |
1da177e4 | 729 | scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) | |
f59114b7 | 730 | (sdev->lun << 5 & 0xe0); |
1da177e4 | 731 | |
631c228c CH |
732 | /* |
733 | * Zero the sense buffer. The scsi spec mandates that any | |
734 | * untransferred sense data should be interpreted as being zero. | |
735 | */ | |
b80ca4f7 | 736 | memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); |
e1c23468 BH |
737 | } |
738 | EXPORT_SYMBOL(scsi_eh_prep_cmnd); | |
739 | ||
740 | /** | |
741 | * scsi_eh_restore_cmnd - Restore a scsi command info as part of error recory | |
742 | * @scmd: SCSI command structure to restore | |
477e608c | 743 | * @ses: saved information from a coresponding call to scsi_eh_prep_cmnd |
e1c23468 | 744 | * |
477e608c | 745 | * Undo any damage done by above scsi_eh_prep_cmnd(). |
dc8875e1 | 746 | */ |
e1c23468 BH |
747 | void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses) |
748 | { | |
749 | /* | |
750 | * Restore original data | |
751 | */ | |
752 | scmd->cmd_len = ses->cmd_len; | |
64a87b24 | 753 | scmd->cmnd = ses->cmnd; |
e1c23468 | 754 | scmd->sc_data_direction = ses->data_direction; |
30b0c37b | 755 | scmd->sdb = ses->sdb; |
6f9a35e2 | 756 | scmd->request->next_rq = ses->next_rq; |
e1c23468 | 757 | scmd->result = ses->result; |
12265709 | 758 | scmd->underflow = ses->underflow; |
db007fc5 | 759 | scmd->prot_op = ses->prot_op; |
e1c23468 BH |
760 | } |
761 | EXPORT_SYMBOL(scsi_eh_restore_cmnd); | |
631c228c | 762 | |
e1c23468 BH |
763 | /** |
764 | * scsi_send_eh_cmnd - submit a scsi command as part of error recory | |
765 | * @scmd: SCSI command structure to hijack | |
766 | * @cmnd: CDB to send | |
767 | * @cmnd_size: size in bytes of @cmnd | |
768 | * @timeout: timeout for this request | |
769 | * @sense_bytes: size of sense data to copy or 0 | |
770 | * | |
771 | * This function is used to send a scsi command down to a target device | |
772 | * as part of the error recovery process. See also scsi_eh_prep_cmnd() above. | |
773 | * | |
774 | * Return value: | |
775 | * SUCCESS or FAILED or NEEDS_RETRY | |
dc8875e1 | 776 | */ |
e1c23468 BH |
777 | static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd, |
778 | int cmnd_size, int timeout, unsigned sense_bytes) | |
779 | { | |
780 | struct scsi_device *sdev = scmd->device; | |
781 | struct Scsi_Host *shost = sdev->host; | |
782 | DECLARE_COMPLETION_ONSTACK(done); | |
783 | unsigned long timeleft; | |
784 | unsigned long flags; | |
785 | struct scsi_eh_save ses; | |
786 | int rtn; | |
787 | ||
788 | scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes); | |
7dfdc9a5 | 789 | shost->eh_action = &done; |
1da177e4 | 790 | |
f59114b7 | 791 | spin_lock_irqsave(shost->host_lock, flags); |
1da177e4 | 792 | scsi_log_send(scmd); |
f59114b7 TH |
793 | shost->hostt->queuecommand(scmd, scsi_eh_done); |
794 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 | 795 | |
7dfdc9a5 | 796 | timeleft = wait_for_completion_timeout(&done, timeout); |
1da177e4 | 797 | |
f59114b7 | 798 | shost->eh_action = NULL; |
1da177e4 | 799 | |
7dfdc9a5 | 800 | scsi_log_completion(scmd, SUCCESS); |
1da177e4 | 801 | |
7dfdc9a5 CH |
802 | SCSI_LOG_ERROR_RECOVERY(3, |
803 | printk("%s: scmd: %p, timeleft: %ld\n", | |
cadbd4a5 | 804 | __func__, scmd, timeleft)); |
1da177e4 LT |
805 | |
806 | /* | |
7dfdc9a5 CH |
807 | * If there is time left scsi_eh_done got called, and we will |
808 | * examine the actual status codes to see whether the command | |
809 | * actually did complete normally, else tell the host to forget | |
810 | * about this command. | |
1da177e4 | 811 | */ |
7dfdc9a5 | 812 | if (timeleft) { |
1da177e4 LT |
813 | rtn = scsi_eh_completed_normally(scmd); |
814 | SCSI_LOG_ERROR_RECOVERY(3, | |
815 | printk("%s: scsi_eh_completed_normally %x\n", | |
cadbd4a5 | 816 | __func__, rtn)); |
7dfdc9a5 | 817 | |
1da177e4 LT |
818 | switch (rtn) { |
819 | case SUCCESS: | |
820 | case NEEDS_RETRY: | |
821 | case FAILED: | |
822 | break; | |
6e883b0e HR |
823 | case ADD_TO_MLQUEUE: |
824 | rtn = NEEDS_RETRY; | |
825 | break; | |
1da177e4 LT |
826 | default: |
827 | rtn = FAILED; | |
828 | break; | |
829 | } | |
7dfdc9a5 | 830 | } else { |
292148f8 | 831 | scsi_abort_eh_cmnd(scmd); |
7dfdc9a5 | 832 | rtn = FAILED; |
1da177e4 LT |
833 | } |
834 | ||
e1c23468 | 835 | scsi_eh_restore_cmnd(scmd, &ses); |
1da177e4 LT |
836 | return rtn; |
837 | } | |
838 | ||
839 | /** | |
840 | * scsi_request_sense - Request sense data from a particular target. | |
841 | * @scmd: SCSI cmd for request sense. | |
842 | * | |
843 | * Notes: | |
844 | * Some hosts automatically obtain this information, others require | |
845 | * that we obtain it on our own. This function will *not* return until | |
846 | * the command either times out, or it completes. | |
dc8875e1 | 847 | */ |
1da177e4 LT |
848 | static int scsi_request_sense(struct scsi_cmnd *scmd) |
849 | { | |
55db6c1b | 850 | return scsi_send_eh_cmnd(scmd, NULL, 0, SENSE_TIMEOUT, ~0); |
1da177e4 LT |
851 | } |
852 | ||
853 | /** | |
854 | * scsi_eh_finish_cmd - Handle a cmd that eh is finished with. | |
855 | * @scmd: Original SCSI cmd that eh has finished. | |
856 | * @done_q: Queue for processed commands. | |
857 | * | |
858 | * Notes: | |
859 | * We don't want to use the normal command completion while we are are | |
860 | * still handling errors - it may cause other commands to be queued, | |
eb44820c | 861 | * and that would disturb what we are doing. Thus we really want to |
1da177e4 LT |
862 | * keep a list of pending commands for final completion, and once we |
863 | * are ready to leave error handling we handle completion for real. | |
dc8875e1 | 864 | */ |
041c5fc3 | 865 | void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q) |
1da177e4 LT |
866 | { |
867 | scmd->device->host->host_failed--; | |
3111b0d1 | 868 | scmd->eh_eflags = 0; |
1da177e4 LT |
869 | list_move_tail(&scmd->eh_entry, done_q); |
870 | } | |
041c5fc3 | 871 | EXPORT_SYMBOL(scsi_eh_finish_cmd); |
1da177e4 LT |
872 | |
873 | /** | |
874 | * scsi_eh_get_sense - Get device sense data. | |
875 | * @work_q: Queue of commands to process. | |
eb44820c | 876 | * @done_q: Queue of processed commands. |
1da177e4 LT |
877 | * |
878 | * Description: | |
879 | * See if we need to request sense information. if so, then get it | |
880 | * now, so we have a better idea of what to do. | |
881 | * | |
882 | * Notes: | |
883 | * This has the unfortunate side effect that if a shost adapter does | |
eb44820c | 884 | * not automatically request sense information, we end up shutting |
1da177e4 LT |
885 | * it down before we request it. |
886 | * | |
887 | * All drivers should request sense information internally these days, | |
888 | * so for now all I have to say is tough noogies if you end up in here. | |
889 | * | |
890 | * XXX: Long term this code should go away, but that needs an audit of | |
891 | * all LLDDs first. | |
dc8875e1 | 892 | */ |
dca84e46 DW |
893 | int scsi_eh_get_sense(struct list_head *work_q, |
894 | struct list_head *done_q) | |
1da177e4 | 895 | { |
937abeaa | 896 | struct scsi_cmnd *scmd, *next; |
1da177e4 LT |
897 | int rtn; |
898 | ||
937abeaa | 899 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 900 | if ((scmd->eh_eflags & SCSI_EH_CANCEL_CMD) || |
1da177e4 LT |
901 | SCSI_SENSE_VALID(scmd)) |
902 | continue; | |
903 | ||
3bf743e7 JG |
904 | SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd, |
905 | "%s: requesting sense\n", | |
906 | current->comm)); | |
1da177e4 LT |
907 | rtn = scsi_request_sense(scmd); |
908 | if (rtn != SUCCESS) | |
909 | continue; | |
910 | ||
911 | SCSI_LOG_ERROR_RECOVERY(3, printk("sense requested for %p" | |
912 | " result %x\n", scmd, | |
913 | scmd->result)); | |
914 | SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense("bh", scmd)); | |
915 | ||
916 | rtn = scsi_decide_disposition(scmd); | |
917 | ||
918 | /* | |
919 | * if the result was normal, then just pass it along to the | |
920 | * upper level. | |
921 | */ | |
922 | if (rtn == SUCCESS) | |
923 | /* we don't want this command reissued, just | |
924 | * finished with the sense data, so set | |
925 | * retries to the max allowed to ensure it | |
926 | * won't get reissued */ | |
927 | scmd->retries = scmd->allowed; | |
928 | else if (rtn != NEEDS_RETRY) | |
929 | continue; | |
930 | ||
931 | scsi_eh_finish_cmd(scmd, done_q); | |
932 | } | |
933 | ||
934 | return list_empty(work_q); | |
935 | } | |
dca84e46 | 936 | EXPORT_SYMBOL_GPL(scsi_eh_get_sense); |
1da177e4 | 937 | |
1da177e4 LT |
938 | /** |
939 | * scsi_eh_tur - Send TUR to device. | |
eb44820c | 940 | * @scmd: &scsi_cmnd to send TUR |
1da177e4 LT |
941 | * |
942 | * Return value: | |
943 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 944 | */ |
1da177e4 LT |
945 | static int scsi_eh_tur(struct scsi_cmnd *scmd) |
946 | { | |
947 | static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0}; | |
948 | int retry_cnt = 1, rtn; | |
949 | ||
950 | retry_tur: | |
0db99e33 | 951 | rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, SENSE_TIMEOUT, 0); |
1da177e4 | 952 | |
1da177e4 | 953 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd %p rtn %x\n", |
cadbd4a5 | 954 | __func__, scmd, rtn)); |
631c228c CH |
955 | |
956 | switch (rtn) { | |
957 | case NEEDS_RETRY: | |
1da177e4 LT |
958 | if (retry_cnt--) |
959 | goto retry_tur; | |
631c228c CH |
960 | /*FALLTHRU*/ |
961 | case SUCCESS: | |
e47373ec | 962 | return 0; |
631c228c CH |
963 | default: |
964 | return 1; | |
e47373ec | 965 | } |
1da177e4 LT |
966 | } |
967 | ||
968 | /** | |
eb44820c RL |
969 | * scsi_eh_abort_cmds - abort pending commands. |
970 | * @work_q: &list_head for pending commands. | |
971 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
972 | * |
973 | * Decription: | |
974 | * Try and see whether or not it makes sense to try and abort the | |
eb44820c RL |
975 | * running command. This only works out to be the case if we have one |
976 | * command that has timed out. If the command simply failed, it makes | |
1da177e4 LT |
977 | * no sense to try and abort the command, since as far as the shost |
978 | * adapter is concerned, it isn't running. | |
dc8875e1 | 979 | */ |
1da177e4 LT |
980 | static int scsi_eh_abort_cmds(struct list_head *work_q, |
981 | struct list_head *done_q) | |
982 | { | |
937abeaa | 983 | struct scsi_cmnd *scmd, *next; |
1da177e4 LT |
984 | int rtn; |
985 | ||
937abeaa | 986 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 987 | if (!(scmd->eh_eflags & SCSI_EH_CANCEL_CMD)) |
1da177e4 LT |
988 | continue; |
989 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting cmd:" | |
990 | "0x%p\n", current->comm, | |
991 | scmd)); | |
992 | rtn = scsi_try_to_abort_cmd(scmd); | |
2f2eb587 | 993 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
3111b0d1 | 994 | scmd->eh_eflags &= ~SCSI_EH_CANCEL_CMD; |
1da177e4 | 995 | if (!scsi_device_online(scmd->device) || |
2f2eb587 | 996 | rtn == FAST_IO_FAIL || |
1da177e4 LT |
997 | !scsi_eh_tur(scmd)) { |
998 | scsi_eh_finish_cmd(scmd, done_q); | |
999 | } | |
1000 | ||
1001 | } else | |
1002 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting" | |
1003 | " cmd failed:" | |
1004 | "0x%p\n", | |
1005 | current->comm, | |
1006 | scmd)); | |
1007 | } | |
1008 | ||
1009 | return list_empty(work_q); | |
1010 | } | |
1011 | ||
1da177e4 LT |
1012 | /** |
1013 | * scsi_eh_try_stu - Send START_UNIT to device. | |
eb44820c | 1014 | * @scmd: &scsi_cmnd to send START_UNIT |
1da177e4 LT |
1015 | * |
1016 | * Return value: | |
1017 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1018 | */ |
1da177e4 LT |
1019 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd) |
1020 | { | |
1021 | static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0}; | |
1da177e4 | 1022 | |
631c228c | 1023 | if (scmd->device->allow_restart) { |
ed773e66 BK |
1024 | int i, rtn = NEEDS_RETRY; |
1025 | ||
1026 | for (i = 0; rtn == NEEDS_RETRY && i < 2; i++) | |
9728c081 | 1027 | rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0); |
1da177e4 | 1028 | |
631c228c CH |
1029 | if (rtn == SUCCESS) |
1030 | return 0; | |
1031 | } | |
1da177e4 | 1032 | |
1da177e4 LT |
1033 | return 1; |
1034 | } | |
1035 | ||
1036 | /** | |
1037 | * scsi_eh_stu - send START_UNIT if needed | |
eb44820c RL |
1038 | * @shost: &scsi host being recovered. |
1039 | * @work_q: &list_head for pending commands. | |
1040 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1041 | * |
1042 | * Notes: | |
1043 | * If commands are failing due to not ready, initializing command required, | |
1044 | * try revalidating the device, which will end up sending a start unit. | |
dc8875e1 | 1045 | */ |
1da177e4 LT |
1046 | static int scsi_eh_stu(struct Scsi_Host *shost, |
1047 | struct list_head *work_q, | |
1048 | struct list_head *done_q) | |
1049 | { | |
937abeaa | 1050 | struct scsi_cmnd *scmd, *stu_scmd, *next; |
1da177e4 LT |
1051 | struct scsi_device *sdev; |
1052 | ||
1053 | shost_for_each_device(sdev, shost) { | |
1054 | stu_scmd = NULL; | |
1055 | list_for_each_entry(scmd, work_q, eh_entry) | |
1056 | if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) && | |
1057 | scsi_check_sense(scmd) == FAILED ) { | |
1058 | stu_scmd = scmd; | |
1059 | break; | |
1060 | } | |
1061 | ||
1062 | if (!stu_scmd) | |
1063 | continue; | |
1064 | ||
1065 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending START_UNIT to sdev:" | |
1066 | " 0x%p\n", current->comm, sdev)); | |
1067 | ||
1068 | if (!scsi_eh_try_stu(stu_scmd)) { | |
1069 | if (!scsi_device_online(sdev) || | |
1070 | !scsi_eh_tur(stu_scmd)) { | |
937abeaa CH |
1071 | list_for_each_entry_safe(scmd, next, |
1072 | work_q, eh_entry) { | |
1da177e4 LT |
1073 | if (scmd->device == sdev) |
1074 | scsi_eh_finish_cmd(scmd, done_q); | |
1075 | } | |
1076 | } | |
1077 | } else { | |
1078 | SCSI_LOG_ERROR_RECOVERY(3, | |
1079 | printk("%s: START_UNIT failed to sdev:" | |
1080 | " 0x%p\n", current->comm, sdev)); | |
1081 | } | |
1082 | } | |
1083 | ||
1084 | return list_empty(work_q); | |
1085 | } | |
1086 | ||
1087 | ||
1088 | /** | |
1089 | * scsi_eh_bus_device_reset - send bdr if needed | |
1090 | * @shost: scsi host being recovered. | |
eb44820c RL |
1091 | * @work_q: &list_head for pending commands. |
1092 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1093 | * |
1094 | * Notes: | |
eb44820c | 1095 | * Try a bus device reset. Still, look to see whether we have multiple |
1da177e4 LT |
1096 | * devices that are jammed or not - if we have multiple devices, it |
1097 | * makes no sense to try bus_device_reset - we really would need to try | |
1098 | * a bus_reset instead. | |
dc8875e1 | 1099 | */ |
1da177e4 LT |
1100 | static int scsi_eh_bus_device_reset(struct Scsi_Host *shost, |
1101 | struct list_head *work_q, | |
1102 | struct list_head *done_q) | |
1103 | { | |
937abeaa | 1104 | struct scsi_cmnd *scmd, *bdr_scmd, *next; |
1da177e4 LT |
1105 | struct scsi_device *sdev; |
1106 | int rtn; | |
1107 | ||
1108 | shost_for_each_device(sdev, shost) { | |
1109 | bdr_scmd = NULL; | |
1110 | list_for_each_entry(scmd, work_q, eh_entry) | |
1111 | if (scmd->device == sdev) { | |
1112 | bdr_scmd = scmd; | |
1113 | break; | |
1114 | } | |
1115 | ||
1116 | if (!bdr_scmd) | |
1117 | continue; | |
1118 | ||
1119 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BDR sdev:" | |
1120 | " 0x%p\n", current->comm, | |
1121 | sdev)); | |
1122 | rtn = scsi_try_bus_device_reset(bdr_scmd); | |
2f2eb587 | 1123 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
1da177e4 | 1124 | if (!scsi_device_online(sdev) || |
2f2eb587 | 1125 | rtn == FAST_IO_FAIL || |
1da177e4 | 1126 | !scsi_eh_tur(bdr_scmd)) { |
937abeaa CH |
1127 | list_for_each_entry_safe(scmd, next, |
1128 | work_q, eh_entry) { | |
1da177e4 LT |
1129 | if (scmd->device == sdev) |
1130 | scsi_eh_finish_cmd(scmd, | |
1131 | done_q); | |
1132 | } | |
1133 | } | |
1134 | } else { | |
1135 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BDR" | |
1136 | " failed sdev:" | |
1137 | "0x%p\n", | |
1138 | current->comm, | |
1139 | sdev)); | |
1140 | } | |
1141 | } | |
1142 | ||
1143 | return list_empty(work_q); | |
1144 | } | |
1145 | ||
30bd7df8 MC |
1146 | /** |
1147 | * scsi_eh_target_reset - send target reset if needed | |
1148 | * @shost: scsi host being recovered. | |
1149 | * @work_q: &list_head for pending commands. | |
1150 | * @done_q: &list_head for processed commands. | |
1151 | * | |
1152 | * Notes: | |
1153 | * Try a target reset. | |
1154 | */ | |
1155 | static int scsi_eh_target_reset(struct Scsi_Host *shost, | |
1156 | struct list_head *work_q, | |
1157 | struct list_head *done_q) | |
1158 | { | |
1159 | struct scsi_cmnd *scmd, *tgtr_scmd, *next; | |
c82dc88d | 1160 | unsigned int id = 0; |
30bd7df8 MC |
1161 | int rtn; |
1162 | ||
c82dc88d | 1163 | do { |
30bd7df8 MC |
1164 | tgtr_scmd = NULL; |
1165 | list_for_each_entry(scmd, work_q, eh_entry) { | |
1166 | if (id == scmd_id(scmd)) { | |
1167 | tgtr_scmd = scmd; | |
1168 | break; | |
1169 | } | |
1170 | } | |
c82dc88d JB |
1171 | if (!tgtr_scmd) { |
1172 | /* not one exactly equal; find the next highest */ | |
1173 | list_for_each_entry(scmd, work_q, eh_entry) { | |
1174 | if (scmd_id(scmd) > id && | |
1175 | (!tgtr_scmd || | |
1176 | scmd_id(tgtr_scmd) > scmd_id(scmd))) | |
1177 | tgtr_scmd = scmd; | |
1178 | } | |
1179 | } | |
30bd7df8 | 1180 | if (!tgtr_scmd) |
c82dc88d JB |
1181 | /* no more commands, that's it */ |
1182 | break; | |
30bd7df8 MC |
1183 | |
1184 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending target reset " | |
1185 | "to target %d\n", | |
1186 | current->comm, id)); | |
1187 | rtn = scsi_try_target_reset(tgtr_scmd); | |
2f2eb587 | 1188 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
30bd7df8 MC |
1189 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1190 | if (id == scmd_id(scmd)) | |
1191 | if (!scsi_device_online(scmd->device) || | |
2f2eb587 | 1192 | rtn == FAST_IO_FAIL || |
30bd7df8 MC |
1193 | !scsi_eh_tur(tgtr_scmd)) |
1194 | scsi_eh_finish_cmd(scmd, | |
1195 | done_q); | |
1196 | } | |
1197 | } else | |
1198 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Target reset" | |
1199 | " failed target: " | |
1200 | "%d\n", | |
1201 | current->comm, id)); | |
c82dc88d JB |
1202 | id++; |
1203 | } while(id != 0); | |
30bd7df8 MC |
1204 | |
1205 | return list_empty(work_q); | |
1206 | } | |
1207 | ||
1da177e4 LT |
1208 | /** |
1209 | * scsi_eh_bus_reset - send a bus reset | |
eb44820c RL |
1210 | * @shost: &scsi host being recovered. |
1211 | * @work_q: &list_head for pending commands. | |
1212 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1213 | */ |
1da177e4 LT |
1214 | static int scsi_eh_bus_reset(struct Scsi_Host *shost, |
1215 | struct list_head *work_q, | |
1216 | struct list_head *done_q) | |
1217 | { | |
937abeaa | 1218 | struct scsi_cmnd *scmd, *chan_scmd, *next; |
1da177e4 LT |
1219 | unsigned int channel; |
1220 | int rtn; | |
1221 | ||
1222 | /* | |
1223 | * we really want to loop over the various channels, and do this on | |
1224 | * a channel by channel basis. we should also check to see if any | |
1225 | * of the failed commands are on soft_reset devices, and if so, skip | |
1226 | * the reset. | |
1227 | */ | |
1228 | ||
1229 | for (channel = 0; channel <= shost->max_channel; channel++) { | |
1230 | chan_scmd = NULL; | |
1231 | list_for_each_entry(scmd, work_q, eh_entry) { | |
422c0d61 | 1232 | if (channel == scmd_channel(scmd)) { |
1da177e4 LT |
1233 | chan_scmd = scmd; |
1234 | break; | |
1235 | /* | |
1236 | * FIXME add back in some support for | |
1237 | * soft_reset devices. | |
1238 | */ | |
1239 | } | |
1240 | } | |
1241 | ||
1242 | if (!chan_scmd) | |
1243 | continue; | |
1244 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BRST chan:" | |
1245 | " %d\n", current->comm, | |
1246 | channel)); | |
1247 | rtn = scsi_try_bus_reset(chan_scmd); | |
2f2eb587 | 1248 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
937abeaa | 1249 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
422c0d61 | 1250 | if (channel == scmd_channel(scmd)) |
1da177e4 | 1251 | if (!scsi_device_online(scmd->device) || |
2f2eb587 | 1252 | rtn == FAST_IO_FAIL || |
1da177e4 LT |
1253 | !scsi_eh_tur(scmd)) |
1254 | scsi_eh_finish_cmd(scmd, | |
1255 | done_q); | |
1256 | } | |
1257 | } else { | |
1258 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BRST" | |
1259 | " failed chan: %d\n", | |
1260 | current->comm, | |
1261 | channel)); | |
1262 | } | |
1263 | } | |
1264 | return list_empty(work_q); | |
1265 | } | |
1266 | ||
1267 | /** | |
1268 | * scsi_eh_host_reset - send a host reset | |
1269 | * @work_q: list_head for processed commands. | |
1270 | * @done_q: list_head for processed commands. | |
dc8875e1 | 1271 | */ |
1da177e4 LT |
1272 | static int scsi_eh_host_reset(struct list_head *work_q, |
1273 | struct list_head *done_q) | |
1274 | { | |
937abeaa | 1275 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1276 | int rtn; |
1da177e4 LT |
1277 | |
1278 | if (!list_empty(work_q)) { | |
1279 | scmd = list_entry(work_q->next, | |
1280 | struct scsi_cmnd, eh_entry); | |
1281 | ||
1282 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending HRST\n" | |
1283 | , current->comm)); | |
1284 | ||
1285 | rtn = scsi_try_host_reset(scmd); | |
2f2eb587 | 1286 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
937abeaa | 1287 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1da177e4 | 1288 | if (!scsi_device_online(scmd->device) || |
2f2eb587 | 1289 | rtn == FAST_IO_FAIL || |
1da177e4 LT |
1290 | (!scsi_eh_try_stu(scmd) && !scsi_eh_tur(scmd)) || |
1291 | !scsi_eh_tur(scmd)) | |
1292 | scsi_eh_finish_cmd(scmd, done_q); | |
1293 | } | |
1294 | } else { | |
1295 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: HRST" | |
1296 | " failed\n", | |
1297 | current->comm)); | |
1298 | } | |
1299 | } | |
1300 | return list_empty(work_q); | |
1301 | } | |
1302 | ||
1303 | /** | |
1304 | * scsi_eh_offline_sdevs - offline scsi devices that fail to recover | |
1305 | * @work_q: list_head for processed commands. | |
1306 | * @done_q: list_head for processed commands. | |
dc8875e1 | 1307 | */ |
1da177e4 LT |
1308 | static void scsi_eh_offline_sdevs(struct list_head *work_q, |
1309 | struct list_head *done_q) | |
1310 | { | |
937abeaa | 1311 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1312 | |
937abeaa | 1313 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
31765d7d MW |
1314 | sdev_printk(KERN_INFO, scmd->device, "Device offlined - " |
1315 | "not ready after error recovery\n"); | |
1da177e4 | 1316 | scsi_device_set_state(scmd->device, SDEV_OFFLINE); |
3111b0d1 | 1317 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) { |
1da177e4 LT |
1318 | /* |
1319 | * FIXME: Handle lost cmds. | |
1320 | */ | |
1321 | } | |
1322 | scsi_eh_finish_cmd(scmd, done_q); | |
1323 | } | |
1324 | return; | |
1325 | } | |
1326 | ||
4a27446f MC |
1327 | /** |
1328 | * scsi_noretry_cmd - determinte if command should be failed fast | |
1329 | * @scmd: SCSI cmd to examine. | |
1330 | */ | |
1331 | int scsi_noretry_cmd(struct scsi_cmnd *scmd) | |
1332 | { | |
1333 | switch (host_byte(scmd->result)) { | |
1334 | case DID_OK: | |
1335 | break; | |
1336 | case DID_BUS_BUSY: | |
33659ebb | 1337 | return (scmd->request->cmd_flags & REQ_FAILFAST_TRANSPORT); |
4a27446f | 1338 | case DID_PARITY: |
33659ebb | 1339 | return (scmd->request->cmd_flags & REQ_FAILFAST_DEV); |
4a27446f MC |
1340 | case DID_ERROR: |
1341 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1342 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1343 | return 0; | |
1344 | /* fall through */ | |
1345 | case DID_SOFT_ERROR: | |
33659ebb | 1346 | return (scmd->request->cmd_flags & REQ_FAILFAST_DRIVER); |
4a27446f MC |
1347 | } |
1348 | ||
1349 | switch (status_byte(scmd->result)) { | |
1350 | case CHECK_CONDITION: | |
1351 | /* | |
1352 | * assume caller has checked sense and determinted | |
1353 | * the check condition was retryable. | |
1354 | */ | |
e96f6abe FT |
1355 | if (scmd->request->cmd_flags & REQ_FAILFAST_DEV || |
1356 | scmd->request->cmd_type == REQ_TYPE_BLOCK_PC) | |
1357 | return 1; | |
4a27446f MC |
1358 | } |
1359 | ||
1360 | return 0; | |
1361 | } | |
1362 | ||
1da177e4 LT |
1363 | /** |
1364 | * scsi_decide_disposition - Disposition a cmd on return from LLD. | |
1365 | * @scmd: SCSI cmd to examine. | |
1366 | * | |
1367 | * Notes: | |
1368 | * This is *only* called when we are examining the status after sending | |
1369 | * out the actual data command. any commands that are queued for error | |
1370 | * recovery (e.g. test_unit_ready) do *not* come through here. | |
1371 | * | |
1372 | * When this routine returns failed, it means the error handler thread | |
1373 | * is woken. In cases where the error code indicates an error that | |
1374 | * doesn't require the error handler read (i.e. we don't need to | |
1375 | * abort/reset), this function should return SUCCESS. | |
dc8875e1 | 1376 | */ |
1da177e4 LT |
1377 | int scsi_decide_disposition(struct scsi_cmnd *scmd) |
1378 | { | |
1379 | int rtn; | |
1380 | ||
1381 | /* | |
1382 | * if the device is offline, then we clearly just pass the result back | |
1383 | * up to the top level. | |
1384 | */ | |
1385 | if (!scsi_device_online(scmd->device)) { | |
1386 | SCSI_LOG_ERROR_RECOVERY(5, printk("%s: device offline - report" | |
1387 | " as SUCCESS\n", | |
cadbd4a5 | 1388 | __func__)); |
1da177e4 LT |
1389 | return SUCCESS; |
1390 | } | |
1391 | ||
1392 | /* | |
1393 | * first check the host byte, to see if there is anything in there | |
1394 | * that would indicate what we need to do. | |
1395 | */ | |
1396 | switch (host_byte(scmd->result)) { | |
1397 | case DID_PASSTHROUGH: | |
1398 | /* | |
1399 | * no matter what, pass this through to the upper layer. | |
1400 | * nuke this special code so that it looks like we are saying | |
1401 | * did_ok. | |
1402 | */ | |
1403 | scmd->result &= 0xff00ffff; | |
1404 | return SUCCESS; | |
1405 | case DID_OK: | |
1406 | /* | |
1407 | * looks good. drop through, and check the next byte. | |
1408 | */ | |
1409 | break; | |
1410 | case DID_NO_CONNECT: | |
1411 | case DID_BAD_TARGET: | |
1412 | case DID_ABORT: | |
1413 | /* | |
1414 | * note - this means that we just report the status back | |
1415 | * to the top level driver, not that we actually think | |
1416 | * that it indicates SUCCESS. | |
1417 | */ | |
1418 | return SUCCESS; | |
1419 | /* | |
1420 | * when the low level driver returns did_soft_error, | |
1421 | * it is responsible for keeping an internal retry counter | |
1422 | * in order to avoid endless loops (db) | |
1423 | * | |
1424 | * actually this is a bug in this function here. we should | |
1425 | * be mindful of the maximum number of retries specified | |
1426 | * and not get stuck in a loop. | |
1427 | */ | |
1428 | case DID_SOFT_ERROR: | |
1429 | goto maybe_retry; | |
1430 | case DID_IMM_RETRY: | |
1431 | return NEEDS_RETRY; | |
1432 | ||
bf341919 JB |
1433 | case DID_REQUEUE: |
1434 | return ADD_TO_MLQUEUE; | |
a4dfaa6f MC |
1435 | case DID_TRANSPORT_DISRUPTED: |
1436 | /* | |
1437 | * LLD/transport was disrupted during processing of the IO. | |
1438 | * The transport class is now blocked/blocking, | |
1439 | * and the transport will decide what to do with the IO | |
939c2288 MC |
1440 | * based on its timers and recovery capablilities if |
1441 | * there are enough retries. | |
a4dfaa6f | 1442 | */ |
939c2288 | 1443 | goto maybe_retry; |
a4dfaa6f MC |
1444 | case DID_TRANSPORT_FAILFAST: |
1445 | /* | |
1446 | * The transport decided to failfast the IO (most likely | |
1447 | * the fast io fail tmo fired), so send IO directly upwards. | |
1448 | */ | |
1449 | return SUCCESS; | |
1da177e4 LT |
1450 | case DID_ERROR: |
1451 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1452 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1453 | /* | |
1454 | * execute reservation conflict processing code | |
1455 | * lower down | |
1456 | */ | |
1457 | break; | |
1458 | /* fallthrough */ | |
1459 | ||
1460 | case DID_BUS_BUSY: | |
1461 | case DID_PARITY: | |
1462 | goto maybe_retry; | |
1463 | case DID_TIME_OUT: | |
1464 | /* | |
1465 | * when we scan the bus, we get timeout messages for | |
1466 | * these commands if there is no device available. | |
1467 | * other hosts report did_no_connect for the same thing. | |
1468 | */ | |
1469 | if ((scmd->cmnd[0] == TEST_UNIT_READY || | |
1470 | scmd->cmnd[0] == INQUIRY)) { | |
1471 | return SUCCESS; | |
1472 | } else { | |
1473 | return FAILED; | |
1474 | } | |
1475 | case DID_RESET: | |
1476 | return SUCCESS; | |
1477 | default: | |
1478 | return FAILED; | |
1479 | } | |
1480 | ||
1481 | /* | |
1482 | * next, check the message byte. | |
1483 | */ | |
1484 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
1485 | return FAILED; | |
1486 | ||
1487 | /* | |
1488 | * check the status byte to see if this indicates anything special. | |
1489 | */ | |
1490 | switch (status_byte(scmd->result)) { | |
1491 | case QUEUE_FULL: | |
42a6a918 | 1492 | scsi_handle_queue_full(scmd->device); |
1da177e4 LT |
1493 | /* |
1494 | * the case of trying to send too many commands to a | |
1495 | * tagged queueing device. | |
1496 | */ | |
1497 | case BUSY: | |
1498 | /* | |
1499 | * device can't talk to us at the moment. Should only | |
1500 | * occur (SAM-3) when the task queue is empty, so will cause | |
1501 | * the empty queue handling to trigger a stall in the | |
1502 | * device. | |
1503 | */ | |
1504 | return ADD_TO_MLQUEUE; | |
1505 | case GOOD: | |
4a84067d | 1506 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 | 1507 | case COMMAND_TERMINATED: |
1da177e4 | 1508 | return SUCCESS; |
a9b589d9 VB |
1509 | case TASK_ABORTED: |
1510 | goto maybe_retry; | |
1da177e4 LT |
1511 | case CHECK_CONDITION: |
1512 | rtn = scsi_check_sense(scmd); | |
1513 | if (rtn == NEEDS_RETRY) | |
1514 | goto maybe_retry; | |
1515 | /* if rtn == FAILED, we have no sense information; | |
1516 | * returning FAILED will wake the error handler thread | |
1517 | * to collect the sense and redo the decide | |
1518 | * disposition */ | |
1519 | return rtn; | |
1520 | case CONDITION_GOOD: | |
1521 | case INTERMEDIATE_GOOD: | |
1522 | case INTERMEDIATE_C_GOOD: | |
1523 | case ACA_ACTIVE: | |
1524 | /* | |
1525 | * who knows? FIXME(eric) | |
1526 | */ | |
1527 | return SUCCESS; | |
1528 | ||
1529 | case RESERVATION_CONFLICT: | |
9ccfc756 JB |
1530 | sdev_printk(KERN_INFO, scmd->device, |
1531 | "reservation conflict\n"); | |
1da177e4 LT |
1532 | return SUCCESS; /* causes immediate i/o error */ |
1533 | default: | |
1534 | return FAILED; | |
1535 | } | |
1536 | return FAILED; | |
1537 | ||
1538 | maybe_retry: | |
1539 | ||
1540 | /* we requeue for retry because the error was retryable, and | |
1541 | * the request was not marked fast fail. Note that above, | |
1542 | * even if the request is marked fast fail, we still requeue | |
1543 | * for queue congestion conditions (QUEUE_FULL or BUSY) */ | |
8884efab | 1544 | if ((++scmd->retries) <= scmd->allowed |
4a27446f | 1545 | && !scsi_noretry_cmd(scmd)) { |
1da177e4 LT |
1546 | return NEEDS_RETRY; |
1547 | } else { | |
1548 | /* | |
1549 | * no more retries - report this one back to upper level. | |
1550 | */ | |
1551 | return SUCCESS; | |
1552 | } | |
1553 | } | |
1554 | ||
f078727b FT |
1555 | static void eh_lock_door_done(struct request *req, int uptodate) |
1556 | { | |
1557 | __blk_put_request(req->q, req); | |
1558 | } | |
1559 | ||
1da177e4 LT |
1560 | /** |
1561 | * scsi_eh_lock_door - Prevent medium removal for the specified device | |
1562 | * @sdev: SCSI device to prevent medium removal | |
1563 | * | |
1564 | * Locking: | |
91bc31fb | 1565 | * We must be called from process context. |
1da177e4 LT |
1566 | * |
1567 | * Notes: | |
1568 | * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the | |
1569 | * head of the devices request queue, and continue. | |
dc8875e1 | 1570 | */ |
1da177e4 LT |
1571 | static void scsi_eh_lock_door(struct scsi_device *sdev) |
1572 | { | |
f078727b | 1573 | struct request *req; |
1da177e4 | 1574 | |
91bc31fb JB |
1575 | /* |
1576 | * blk_get_request with GFP_KERNEL (__GFP_WAIT) sleeps until a | |
1577 | * request becomes available | |
1578 | */ | |
f078727b | 1579 | req = blk_get_request(sdev->request_queue, READ, GFP_KERNEL); |
1da177e4 | 1580 | |
f078727b FT |
1581 | req->cmd[0] = ALLOW_MEDIUM_REMOVAL; |
1582 | req->cmd[1] = 0; | |
1583 | req->cmd[2] = 0; | |
1584 | req->cmd[3] = 0; | |
1585 | req->cmd[4] = SCSI_REMOVAL_PREVENT; | |
1586 | req->cmd[5] = 0; | |
1da177e4 | 1587 | |
f078727b FT |
1588 | req->cmd_len = COMMAND_SIZE(req->cmd[0]); |
1589 | ||
1590 | req->cmd_type = REQ_TYPE_BLOCK_PC; | |
1591 | req->cmd_flags |= REQ_QUIET; | |
1592 | req->timeout = 10 * HZ; | |
1593 | req->retries = 5; | |
1594 | ||
1595 | blk_execute_rq_nowait(req->q, NULL, req, 1, eh_lock_door_done); | |
1596 | } | |
1da177e4 LT |
1597 | |
1598 | /** | |
1599 | * scsi_restart_operations - restart io operations to the specified host. | |
1600 | * @shost: Host we are restarting. | |
1601 | * | |
1602 | * Notes: | |
1603 | * When we entered the error handler, we blocked all further i/o to | |
1604 | * this device. we need to 'reverse' this process. | |
dc8875e1 | 1605 | */ |
1da177e4 LT |
1606 | static void scsi_restart_operations(struct Scsi_Host *shost) |
1607 | { | |
1608 | struct scsi_device *sdev; | |
939647ee | 1609 | unsigned long flags; |
1da177e4 LT |
1610 | |
1611 | /* | |
1612 | * If the door was locked, we need to insert a door lock request | |
1613 | * onto the head of the SCSI request queue for the device. There | |
1614 | * is no point trying to lock the door of an off-line device. | |
1615 | */ | |
1616 | shost_for_each_device(sdev, shost) { | |
1617 | if (scsi_device_online(sdev) && sdev->locked) | |
1618 | scsi_eh_lock_door(sdev); | |
1619 | } | |
1620 | ||
1621 | /* | |
1622 | * next free up anything directly waiting upon the host. this | |
1623 | * will be requests for character device operations, and also for | |
1624 | * ioctls to queued block devices. | |
1625 | */ | |
1626 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: waking up host to restart\n", | |
cadbd4a5 | 1627 | __func__)); |
1da177e4 | 1628 | |
939647ee JB |
1629 | spin_lock_irqsave(shost->host_lock, flags); |
1630 | if (scsi_host_set_state(shost, SHOST_RUNNING)) | |
1631 | if (scsi_host_set_state(shost, SHOST_CANCEL)) | |
1632 | BUG_ON(scsi_host_set_state(shost, SHOST_DEL)); | |
1633 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
1634 | |
1635 | wake_up(&shost->host_wait); | |
1636 | ||
1637 | /* | |
1638 | * finally we need to re-initiate requests that may be pending. we will | |
1639 | * have had everything blocked while error handling is taking place, and | |
1640 | * now that error recovery is done, we will need to ensure that these | |
1641 | * requests are started. | |
1642 | */ | |
1643 | scsi_run_host_queues(shost); | |
1644 | } | |
1645 | ||
1646 | /** | |
1647 | * scsi_eh_ready_devs - check device ready state and recover if not. | |
1648 | * @shost: host to be recovered. | |
eb44820c RL |
1649 | * @work_q: &list_head for pending commands. |
1650 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1651 | */ |
dca84e46 DW |
1652 | void scsi_eh_ready_devs(struct Scsi_Host *shost, |
1653 | struct list_head *work_q, | |
1654 | struct list_head *done_q) | |
1da177e4 LT |
1655 | { |
1656 | if (!scsi_eh_stu(shost, work_q, done_q)) | |
1657 | if (!scsi_eh_bus_device_reset(shost, work_q, done_q)) | |
30bd7df8 MC |
1658 | if (!scsi_eh_target_reset(shost, work_q, done_q)) |
1659 | if (!scsi_eh_bus_reset(shost, work_q, done_q)) | |
1660 | if (!scsi_eh_host_reset(work_q, done_q)) | |
1661 | scsi_eh_offline_sdevs(work_q, | |
1662 | done_q); | |
1da177e4 | 1663 | } |
dca84e46 | 1664 | EXPORT_SYMBOL_GPL(scsi_eh_ready_devs); |
1da177e4 LT |
1665 | |
1666 | /** | |
1667 | * scsi_eh_flush_done_q - finish processed commands or retry them. | |
1668 | * @done_q: list_head of processed commands. | |
dc8875e1 | 1669 | */ |
041c5fc3 | 1670 | void scsi_eh_flush_done_q(struct list_head *done_q) |
1da177e4 | 1671 | { |
937abeaa | 1672 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1673 | |
937abeaa CH |
1674 | list_for_each_entry_safe(scmd, next, done_q, eh_entry) { |
1675 | list_del_init(&scmd->eh_entry); | |
1da177e4 | 1676 | if (scsi_device_online(scmd->device) && |
4a27446f | 1677 | !scsi_noretry_cmd(scmd) && |
8884efab | 1678 | (++scmd->retries <= scmd->allowed)) { |
1da177e4 LT |
1679 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush" |
1680 | " retry cmd: %p\n", | |
1681 | current->comm, | |
1682 | scmd)); | |
1683 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); | |
1684 | } else { | |
793698ce PM |
1685 | /* |
1686 | * If just we got sense for the device (called | |
1687 | * scsi_eh_get_sense), scmd->result is already | |
1688 | * set, do not set DRIVER_TIMEOUT. | |
1689 | */ | |
1da177e4 LT |
1690 | if (!scmd->result) |
1691 | scmd->result |= (DRIVER_TIMEOUT << 24); | |
1692 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush finish" | |
1693 | " cmd: %p\n", | |
1694 | current->comm, scmd)); | |
1695 | scsi_finish_command(scmd); | |
1696 | } | |
1697 | } | |
1698 | } | |
041c5fc3 | 1699 | EXPORT_SYMBOL(scsi_eh_flush_done_q); |
1da177e4 LT |
1700 | |
1701 | /** | |
1702 | * scsi_unjam_host - Attempt to fix a host which has a cmd that failed. | |
1703 | * @shost: Host to unjam. | |
1704 | * | |
1705 | * Notes: | |
1706 | * When we come in here, we *know* that all commands on the bus have | |
1707 | * either completed, failed or timed out. we also know that no further | |
1708 | * commands are being sent to the host, so things are relatively quiet | |
1709 | * and we have freedom to fiddle with things as we wish. | |
1710 | * | |
1711 | * This is only the *default* implementation. it is possible for | |
1712 | * individual drivers to supply their own version of this function, and | |
1713 | * if the maintainer wishes to do this, it is strongly suggested that | |
1714 | * this function be taken as a template and modified. this function | |
1715 | * was designed to correctly handle problems for about 95% of the | |
1716 | * different cases out there, and it should always provide at least a | |
1717 | * reasonable amount of error recovery. | |
1718 | * | |
1719 | * Any command marked 'failed' or 'timeout' must eventually have | |
1720 | * scsi_finish_cmd() called for it. we do all of the retry stuff | |
1721 | * here, so when we restart the host after we return it should have an | |
1722 | * empty queue. | |
dc8875e1 | 1723 | */ |
1da177e4 LT |
1724 | static void scsi_unjam_host(struct Scsi_Host *shost) |
1725 | { | |
1726 | unsigned long flags; | |
1727 | LIST_HEAD(eh_work_q); | |
1728 | LIST_HEAD(eh_done_q); | |
1729 | ||
1730 | spin_lock_irqsave(shost->host_lock, flags); | |
1731 | list_splice_init(&shost->eh_cmd_q, &eh_work_q); | |
1732 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1733 | ||
1734 | SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost, &eh_work_q)); | |
1735 | ||
1736 | if (!scsi_eh_get_sense(&eh_work_q, &eh_done_q)) | |
1737 | if (!scsi_eh_abort_cmds(&eh_work_q, &eh_done_q)) | |
1738 | scsi_eh_ready_devs(shost, &eh_work_q, &eh_done_q); | |
1739 | ||
1740 | scsi_eh_flush_done_q(&eh_done_q); | |
1741 | } | |
1742 | ||
1743 | /** | |
ad42eb1b | 1744 | * scsi_error_handler - SCSI error handler thread |
1da177e4 LT |
1745 | * @data: Host for which we are running. |
1746 | * | |
1747 | * Notes: | |
ad42eb1b CH |
1748 | * This is the main error handling loop. This is run as a kernel thread |
1749 | * for every SCSI host and handles all error handling activity. | |
dc8875e1 | 1750 | */ |
1da177e4 LT |
1751 | int scsi_error_handler(void *data) |
1752 | { | |
ad42eb1b | 1753 | struct Scsi_Host *shost = data; |
1da177e4 | 1754 | |
1da177e4 | 1755 | /* |
ad42eb1b CH |
1756 | * We use TASK_INTERRUPTIBLE so that the thread is not |
1757 | * counted against the load average as a running process. | |
1758 | * We never actually get interrupted because kthread_run | |
c03264a7 | 1759 | * disables signal delivery for the created thread. |
1da177e4 | 1760 | */ |
3ed7a470 JB |
1761 | set_current_state(TASK_INTERRUPTIBLE); |
1762 | while (!kthread_should_stop()) { | |
ee7863bc | 1763 | if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) || |
3ed7a470 | 1764 | shost->host_failed != shost->host_busy) { |
ad42eb1b CH |
1765 | SCSI_LOG_ERROR_RECOVERY(1, |
1766 | printk("Error handler scsi_eh_%d sleeping\n", | |
1767 | shost->host_no)); | |
3ed7a470 JB |
1768 | schedule(); |
1769 | set_current_state(TASK_INTERRUPTIBLE); | |
1770 | continue; | |
1771 | } | |
1da177e4 | 1772 | |
3ed7a470 | 1773 | __set_current_state(TASK_RUNNING); |
ad42eb1b CH |
1774 | SCSI_LOG_ERROR_RECOVERY(1, |
1775 | printk("Error handler scsi_eh_%d waking up\n", | |
1776 | shost->host_no)); | |
1da177e4 | 1777 | |
1da177e4 LT |
1778 | /* |
1779 | * We have a host that is failing for some reason. Figure out | |
1780 | * what we need to do to get it up and online again (if we can). | |
1781 | * If we fail, we end up taking the thing offline. | |
1782 | */ | |
bc4f2401 AS |
1783 | if (scsi_autopm_get_host(shost) != 0) { |
1784 | SCSI_LOG_ERROR_RECOVERY(1, | |
1785 | printk(KERN_ERR "Error handler scsi_eh_%d " | |
1786 | "unable to autoresume\n", | |
1787 | shost->host_no)); | |
1788 | continue; | |
1789 | } | |
1790 | ||
9227c33d CH |
1791 | if (shost->transportt->eh_strategy_handler) |
1792 | shost->transportt->eh_strategy_handler(shost); | |
1da177e4 LT |
1793 | else |
1794 | scsi_unjam_host(shost); | |
1795 | ||
1da177e4 LT |
1796 | /* |
1797 | * Note - if the above fails completely, the action is to take | |
1798 | * individual devices offline and flush the queue of any | |
1799 | * outstanding requests that may have been pending. When we | |
1800 | * restart, we restart any I/O to any other devices on the bus | |
1801 | * which are still online. | |
1802 | */ | |
1803 | scsi_restart_operations(shost); | |
bc4f2401 | 1804 | scsi_autopm_put_host(shost); |
3ed7a470 | 1805 | set_current_state(TASK_INTERRUPTIBLE); |
1da177e4 | 1806 | } |
461a0ffb SR |
1807 | __set_current_state(TASK_RUNNING); |
1808 | ||
ad42eb1b CH |
1809 | SCSI_LOG_ERROR_RECOVERY(1, |
1810 | printk("Error handler scsi_eh_%d exiting\n", shost->host_no)); | |
3ed7a470 | 1811 | shost->ehandler = NULL; |
1da177e4 LT |
1812 | return 0; |
1813 | } | |
1814 | ||
1815 | /* | |
1816 | * Function: scsi_report_bus_reset() | |
1817 | * | |
1818 | * Purpose: Utility function used by low-level drivers to report that | |
1819 | * they have observed a bus reset on the bus being handled. | |
1820 | * | |
1821 | * Arguments: shost - Host in question | |
1822 | * channel - channel on which reset was observed. | |
1823 | * | |
1824 | * Returns: Nothing | |
1825 | * | |
1826 | * Lock status: Host lock must be held. | |
1827 | * | |
1828 | * Notes: This only needs to be called if the reset is one which | |
1829 | * originates from an unknown location. Resets originated | |
1830 | * by the mid-level itself don't need to call this, but there | |
1831 | * should be no harm. | |
1832 | * | |
1833 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
1834 | * is properly treated. | |
1835 | */ | |
1836 | void scsi_report_bus_reset(struct Scsi_Host *shost, int channel) | |
1837 | { | |
1838 | struct scsi_device *sdev; | |
1839 | ||
1840 | __shost_for_each_device(sdev, shost) { | |
30bd7df8 MC |
1841 | if (channel == sdev_channel(sdev)) |
1842 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
1843 | } |
1844 | } | |
1845 | EXPORT_SYMBOL(scsi_report_bus_reset); | |
1846 | ||
1847 | /* | |
1848 | * Function: scsi_report_device_reset() | |
1849 | * | |
1850 | * Purpose: Utility function used by low-level drivers to report that | |
1851 | * they have observed a device reset on the device being handled. | |
1852 | * | |
1853 | * Arguments: shost - Host in question | |
1854 | * channel - channel on which reset was observed | |
1855 | * target - target on which reset was observed | |
1856 | * | |
1857 | * Returns: Nothing | |
1858 | * | |
1859 | * Lock status: Host lock must be held | |
1860 | * | |
1861 | * Notes: This only needs to be called if the reset is one which | |
1862 | * originates from an unknown location. Resets originated | |
1863 | * by the mid-level itself don't need to call this, but there | |
1864 | * should be no harm. | |
1865 | * | |
1866 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
1867 | * is properly treated. | |
1868 | */ | |
1869 | void scsi_report_device_reset(struct Scsi_Host *shost, int channel, int target) | |
1870 | { | |
1871 | struct scsi_device *sdev; | |
1872 | ||
1873 | __shost_for_each_device(sdev, shost) { | |
422c0d61 | 1874 | if (channel == sdev_channel(sdev) && |
30bd7df8 MC |
1875 | target == sdev_id(sdev)) |
1876 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
1877 | } |
1878 | } | |
1879 | EXPORT_SYMBOL(scsi_report_device_reset); | |
1880 | ||
1881 | static void | |
1882 | scsi_reset_provider_done_command(struct scsi_cmnd *scmd) | |
1883 | { | |
1884 | } | |
1885 | ||
1886 | /* | |
1887 | * Function: scsi_reset_provider | |
1888 | * | |
1889 | * Purpose: Send requested reset to a bus or device at any phase. | |
1890 | * | |
1891 | * Arguments: device - device to send reset to | |
1892 | * flag - reset type (see scsi.h) | |
1893 | * | |
1894 | * Returns: SUCCESS/FAILURE. | |
1895 | * | |
1896 | * Notes: This is used by the SCSI Generic driver to provide | |
1897 | * Bus/Device reset capability. | |
1898 | */ | |
1899 | int | |
1900 | scsi_reset_provider(struct scsi_device *dev, int flag) | |
1901 | { | |
bc4f2401 | 1902 | struct scsi_cmnd *scmd; |
d7a1bb0a | 1903 | struct Scsi_Host *shost = dev->host; |
1da177e4 | 1904 | struct request req; |
d7a1bb0a | 1905 | unsigned long flags; |
1da177e4 LT |
1906 | int rtn; |
1907 | ||
bc4f2401 AS |
1908 | if (scsi_autopm_get_host(shost) < 0) |
1909 | return FAILED; | |
1910 | ||
1911 | scmd = scsi_get_command(dev, GFP_KERNEL); | |
4f54eec8 | 1912 | blk_rq_init(NULL, &req); |
1da177e4 | 1913 | scmd->request = &req; |
b4edcbca | 1914 | |
64a87b24 BH |
1915 | scmd->cmnd = req.cmd; |
1916 | ||
1da177e4 | 1917 | scmd->scsi_done = scsi_reset_provider_done_command; |
30b0c37b | 1918 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
1da177e4 LT |
1919 | |
1920 | scmd->cmd_len = 0; | |
1921 | ||
1922 | scmd->sc_data_direction = DMA_BIDIRECTIONAL; | |
1da177e4 | 1923 | |
d7a1bb0a JS |
1924 | spin_lock_irqsave(shost->host_lock, flags); |
1925 | shost->tmf_in_progress = 1; | |
1926 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1927 | ||
1da177e4 LT |
1928 | switch (flag) { |
1929 | case SCSI_TRY_RESET_DEVICE: | |
1930 | rtn = scsi_try_bus_device_reset(scmd); | |
1931 | if (rtn == SUCCESS) | |
1932 | break; | |
1933 | /* FALLTHROUGH */ | |
30bd7df8 MC |
1934 | case SCSI_TRY_RESET_TARGET: |
1935 | rtn = scsi_try_target_reset(scmd); | |
1936 | if (rtn == SUCCESS) | |
1937 | break; | |
1938 | /* FALLTHROUGH */ | |
1da177e4 LT |
1939 | case SCSI_TRY_RESET_BUS: |
1940 | rtn = scsi_try_bus_reset(scmd); | |
1941 | if (rtn == SUCCESS) | |
1942 | break; | |
1943 | /* FALLTHROUGH */ | |
1944 | case SCSI_TRY_RESET_HOST: | |
1945 | rtn = scsi_try_host_reset(scmd); | |
1946 | break; | |
1947 | default: | |
1948 | rtn = FAILED; | |
1949 | } | |
1950 | ||
d7a1bb0a JS |
1951 | spin_lock_irqsave(shost->host_lock, flags); |
1952 | shost->tmf_in_progress = 0; | |
1953 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1954 | ||
1955 | /* | |
1956 | * be sure to wake up anyone who was sleeping or had their queue | |
1957 | * suspended while we performed the TMF. | |
1958 | */ | |
1959 | SCSI_LOG_ERROR_RECOVERY(3, | |
1960 | printk("%s: waking up host to restart after TMF\n", | |
cadbd4a5 | 1961 | __func__)); |
d7a1bb0a JS |
1962 | |
1963 | wake_up(&shost->host_wait); | |
1964 | ||
1965 | scsi_run_host_queues(shost); | |
1966 | ||
1da177e4 | 1967 | scsi_next_command(scmd); |
bc4f2401 | 1968 | scsi_autopm_put_host(shost); |
1da177e4 LT |
1969 | return rtn; |
1970 | } | |
1971 | EXPORT_SYMBOL(scsi_reset_provider); | |
1972 | ||
1973 | /** | |
1974 | * scsi_normalize_sense - normalize main elements from either fixed or | |
1975 | * descriptor sense data format into a common format. | |
1976 | * | |
1977 | * @sense_buffer: byte array containing sense data returned by device | |
1978 | * @sb_len: number of valid bytes in sense_buffer | |
1979 | * @sshdr: pointer to instance of structure that common | |
1980 | * elements are written to. | |
1981 | * | |
1982 | * Notes: | |
1983 | * The "main elements" from sense data are: response_code, sense_key, | |
1984 | * asc, ascq and additional_length (only for descriptor format). | |
1985 | * | |
1986 | * Typically this function can be called after a device has | |
1987 | * responded to a SCSI command with the CHECK_CONDITION status. | |
1988 | * | |
1989 | * Return value: | |
1990 | * 1 if valid sense data information found, else 0; | |
dc8875e1 | 1991 | */ |
1da177e4 LT |
1992 | int scsi_normalize_sense(const u8 *sense_buffer, int sb_len, |
1993 | struct scsi_sense_hdr *sshdr) | |
1994 | { | |
33aa687d | 1995 | if (!sense_buffer || !sb_len) |
1da177e4 LT |
1996 | return 0; |
1997 | ||
1998 | memset(sshdr, 0, sizeof(struct scsi_sense_hdr)); | |
1999 | ||
2000 | sshdr->response_code = (sense_buffer[0] & 0x7f); | |
33aa687d JB |
2001 | |
2002 | if (!scsi_sense_valid(sshdr)) | |
2003 | return 0; | |
2004 | ||
1da177e4 LT |
2005 | if (sshdr->response_code >= 0x72) { |
2006 | /* | |
2007 | * descriptor format | |
2008 | */ | |
2009 | if (sb_len > 1) | |
2010 | sshdr->sense_key = (sense_buffer[1] & 0xf); | |
2011 | if (sb_len > 2) | |
2012 | sshdr->asc = sense_buffer[2]; | |
2013 | if (sb_len > 3) | |
2014 | sshdr->ascq = sense_buffer[3]; | |
2015 | if (sb_len > 7) | |
2016 | sshdr->additional_length = sense_buffer[7]; | |
2017 | } else { | |
2018 | /* | |
2019 | * fixed format | |
2020 | */ | |
2021 | if (sb_len > 2) | |
2022 | sshdr->sense_key = (sense_buffer[2] & 0xf); | |
2023 | if (sb_len > 7) { | |
2024 | sb_len = (sb_len < (sense_buffer[7] + 8)) ? | |
2025 | sb_len : (sense_buffer[7] + 8); | |
2026 | if (sb_len > 12) | |
2027 | sshdr->asc = sense_buffer[12]; | |
2028 | if (sb_len > 13) | |
2029 | sshdr->ascq = sense_buffer[13]; | |
2030 | } | |
2031 | } | |
2032 | ||
2033 | return 1; | |
2034 | } | |
2035 | EXPORT_SYMBOL(scsi_normalize_sense); | |
2036 | ||
1da177e4 LT |
2037 | int scsi_command_normalize_sense(struct scsi_cmnd *cmd, |
2038 | struct scsi_sense_hdr *sshdr) | |
2039 | { | |
2040 | return scsi_normalize_sense(cmd->sense_buffer, | |
b80ca4f7 | 2041 | SCSI_SENSE_BUFFERSIZE, sshdr); |
1da177e4 LT |
2042 | } |
2043 | EXPORT_SYMBOL(scsi_command_normalize_sense); | |
2044 | ||
2045 | /** | |
eb44820c | 2046 | * scsi_sense_desc_find - search for a given descriptor type in descriptor sense data format. |
1da177e4 LT |
2047 | * @sense_buffer: byte array of descriptor format sense data |
2048 | * @sb_len: number of valid bytes in sense_buffer | |
2049 | * @desc_type: value of descriptor type to find | |
2050 | * (e.g. 0 -> information) | |
2051 | * | |
2052 | * Notes: | |
2053 | * only valid when sense data is in descriptor format | |
2054 | * | |
2055 | * Return value: | |
2056 | * pointer to start of (first) descriptor if found else NULL | |
dc8875e1 | 2057 | */ |
1da177e4 LT |
2058 | const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len, |
2059 | int desc_type) | |
2060 | { | |
2061 | int add_sen_len, add_len, desc_len, k; | |
2062 | const u8 * descp; | |
2063 | ||
2064 | if ((sb_len < 8) || (0 == (add_sen_len = sense_buffer[7]))) | |
2065 | return NULL; | |
2066 | if ((sense_buffer[0] < 0x72) || (sense_buffer[0] > 0x73)) | |
2067 | return NULL; | |
2068 | add_sen_len = (add_sen_len < (sb_len - 8)) ? | |
2069 | add_sen_len : (sb_len - 8); | |
2070 | descp = &sense_buffer[8]; | |
2071 | for (desc_len = 0, k = 0; k < add_sen_len; k += desc_len) { | |
2072 | descp += desc_len; | |
2073 | add_len = (k < (add_sen_len - 1)) ? descp[1]: -1; | |
2074 | desc_len = add_len + 2; | |
2075 | if (descp[0] == desc_type) | |
2076 | return descp; | |
2077 | if (add_len < 0) // short descriptor ?? | |
2078 | break; | |
2079 | } | |
2080 | return NULL; | |
2081 | } | |
2082 | EXPORT_SYMBOL(scsi_sense_desc_find); | |
2083 | ||
2084 | /** | |
eb44820c | 2085 | * scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor format) |
1da177e4 LT |
2086 | * @sense_buffer: byte array of sense data |
2087 | * @sb_len: number of valid bytes in sense_buffer | |
2088 | * @info_out: pointer to 64 integer where 8 or 4 byte information | |
2089 | * field will be placed if found. | |
2090 | * | |
2091 | * Return value: | |
2092 | * 1 if information field found, 0 if not found. | |
dc8875e1 | 2093 | */ |
1da177e4 LT |
2094 | int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len, |
2095 | u64 * info_out) | |
2096 | { | |
2097 | int j; | |
2098 | const u8 * ucp; | |
2099 | u64 ull; | |
2100 | ||
2101 | if (sb_len < 7) | |
2102 | return 0; | |
2103 | switch (sense_buffer[0] & 0x7f) { | |
2104 | case 0x70: | |
2105 | case 0x71: | |
2106 | if (sense_buffer[0] & 0x80) { | |
2107 | *info_out = (sense_buffer[3] << 24) + | |
2108 | (sense_buffer[4] << 16) + | |
2109 | (sense_buffer[5] << 8) + sense_buffer[6]; | |
2110 | return 1; | |
2111 | } else | |
2112 | return 0; | |
2113 | case 0x72: | |
2114 | case 0x73: | |
2115 | ucp = scsi_sense_desc_find(sense_buffer, sb_len, | |
2116 | 0 /* info desc */); | |
2117 | if (ucp && (0xa == ucp[1])) { | |
2118 | ull = 0; | |
2119 | for (j = 0; j < 8; ++j) { | |
2120 | if (j > 0) | |
2121 | ull <<= 8; | |
2122 | ull |= ucp[4 + j]; | |
2123 | } | |
2124 | *info_out = ull; | |
2125 | return 1; | |
2126 | } else | |
2127 | return 0; | |
2128 | default: | |
2129 | return 0; | |
2130 | } | |
2131 | } | |
2132 | EXPORT_SYMBOL(scsi_get_sense_info_fld); | |
3bc6a261 FT |
2133 | |
2134 | /** | |
2135 | * scsi_build_sense_buffer - build sense data in a buffer | |
2136 | * @desc: Sense format (non zero == descriptor format, | |
2137 | * 0 == fixed format) | |
2138 | * @buf: Where to build sense data | |
2139 | * @key: Sense key | |
2140 | * @asc: Additional sense code | |
2141 | * @ascq: Additional sense code qualifier | |
2142 | * | |
2143 | **/ | |
2144 | void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq) | |
2145 | { | |
2146 | if (desc) { | |
2147 | buf[0] = 0x72; /* descriptor, current */ | |
2148 | buf[1] = key; | |
2149 | buf[2] = asc; | |
2150 | buf[3] = ascq; | |
2151 | buf[7] = 0; | |
2152 | } else { | |
2153 | buf[0] = 0x70; /* fixed, current */ | |
2154 | buf[2] = key; | |
2155 | buf[7] = 0xa; | |
2156 | buf[12] = asc; | |
2157 | buf[13] = ascq; | |
2158 | } | |
2159 | } | |
2160 | EXPORT_SYMBOL(scsi_build_sense_buffer); |