Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * scsi_error.c Copyright (C) 1997 Eric Youngdale | |
3 | * | |
4 | * SCSI error/timeout handling | |
5 | * Initial versions: Eric Youngdale. Based upon conversations with | |
0bf8c869 | 6 | * Leonard Zubkoff and David Miller at Linux Expo, |
1da177e4 LT |
7 | * ideas originating from all over the place. |
8 | * | |
9 | * Restructured scsi_unjam_host and associated functions. | |
10 | * September 04, 2002 Mike Anderson (andmike@us.ibm.com) | |
11 | * | |
12 | * Forward port of Russell King's (rmk@arm.linux.org.uk) changes and | |
0bf8c869 | 13 | * minor cleanups. |
1da177e4 LT |
14 | * September 30, 2002 Mike Anderson (andmike@us.ibm.com) |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/sched.h> | |
5a0e3ad6 | 19 | #include <linux/gfp.h> |
1da177e4 LT |
20 | #include <linux/timer.h> |
21 | #include <linux/string.h> | |
1da177e4 | 22 | #include <linux/kernel.h> |
83144186 | 23 | #include <linux/freezer.h> |
c5478def | 24 | #include <linux/kthread.h> |
1da177e4 LT |
25 | #include <linux/interrupt.h> |
26 | #include <linux/blkdev.h> | |
27 | #include <linux/delay.h> | |
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 | ||
3eef6257 DJ |
53 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd); |
54 | ||
1da177e4 LT |
55 | /* called with shost->host_lock held */ |
56 | void scsi_eh_wakeup(struct Scsi_Host *shost) | |
57 | { | |
58 | if (shost->host_busy == shost->host_failed) { | |
bf816235 | 59 | trace_scsi_eh_wakeup(shost); |
3ed7a470 | 60 | wake_up_process(shost->ehandler); |
1da177e4 LT |
61 | SCSI_LOG_ERROR_RECOVERY(5, |
62 | printk("Waking error handler thread\n")); | |
63 | } | |
64 | } | |
f8bbfc24 TH |
65 | |
66 | /** | |
67 | * scsi_schedule_eh - schedule EH for SCSI host | |
68 | * @shost: SCSI host to invoke error handling on. | |
69 | * | |
70 | * Schedule SCSI EH without scmd. | |
dc8875e1 | 71 | */ |
f8bbfc24 TH |
72 | void scsi_schedule_eh(struct Scsi_Host *shost) |
73 | { | |
74 | unsigned long flags; | |
75 | ||
76 | spin_lock_irqsave(shost->host_lock, flags); | |
77 | ||
78 | if (scsi_host_set_state(shost, SHOST_RECOVERY) == 0 || | |
79 | scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY) == 0) { | |
80 | shost->host_eh_scheduled++; | |
81 | scsi_eh_wakeup(shost); | |
82 | } | |
83 | ||
84 | spin_unlock_irqrestore(shost->host_lock, flags); | |
85 | } | |
86 | EXPORT_SYMBOL_GPL(scsi_schedule_eh); | |
1da177e4 LT |
87 | |
88 | /** | |
89 | * scsi_eh_scmd_add - add scsi cmd to error handling. | |
90 | * @scmd: scmd to run eh on. | |
91 | * @eh_flag: optional SCSI_EH flag. | |
92 | * | |
93 | * Return value: | |
94 | * 0 on failure. | |
dc8875e1 | 95 | */ |
1da177e4 LT |
96 | int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag) |
97 | { | |
98 | struct Scsi_Host *shost = scmd->device->host; | |
99 | unsigned long flags; | |
939647ee | 100 | int ret = 0; |
1da177e4 | 101 | |
3ed7a470 | 102 | if (!shost->ehandler) |
1da177e4 LT |
103 | return 0; |
104 | ||
105 | spin_lock_irqsave(shost->host_lock, flags); | |
939647ee JB |
106 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) |
107 | if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) | |
108 | goto out_unlock; | |
1da177e4 | 109 | |
939647ee | 110 | ret = 1; |
3111b0d1 | 111 | scmd->eh_eflags |= eh_flag; |
1da177e4 | 112 | list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q); |
1da177e4 LT |
113 | shost->host_failed++; |
114 | scsi_eh_wakeup(shost); | |
939647ee | 115 | out_unlock: |
1da177e4 | 116 | spin_unlock_irqrestore(shost->host_lock, flags); |
939647ee | 117 | return ret; |
1da177e4 LT |
118 | } |
119 | ||
1da177e4 LT |
120 | /** |
121 | * scsi_times_out - Timeout function for normal scsi commands. | |
242f9dcb | 122 | * @req: request that is timing out. |
1da177e4 LT |
123 | * |
124 | * Notes: | |
125 | * We do not need to lock this. There is the potential for a race | |
126 | * only in that the normal completion handling might run, but if the | |
127 | * normal completion function determines that the timer has already | |
128 | * fired, then it mustn't do anything. | |
dc8875e1 | 129 | */ |
242f9dcb | 130 | enum blk_eh_timer_return scsi_times_out(struct request *req) |
1da177e4 | 131 | { |
242f9dcb | 132 | struct scsi_cmnd *scmd = req->special; |
242f9dcb | 133 | enum blk_eh_timer_return rtn = BLK_EH_NOT_HANDLED; |
0bf8c869 | 134 | struct Scsi_Host *host = scmd->device->host; |
6c5f8ce1 | 135 | |
bf816235 | 136 | trace_scsi_dispatch_cmd_timeout(scmd); |
1da177e4 LT |
137 | scsi_log_completion(scmd, TIMEOUT_ERROR); |
138 | ||
0bf8c869 JJ |
139 | if (host->transportt->eh_timed_out) |
140 | rtn = host->transportt->eh_timed_out(scmd); | |
141 | else if (host->hostt->eh_timed_out) | |
142 | rtn = host->hostt->eh_timed_out(scmd); | |
1da177e4 | 143 | |
fa990781 CH |
144 | if (unlikely(rtn == BLK_EH_NOT_HANDLED && |
145 | !scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD))) { | |
939647ee | 146 | scmd->result |= DID_TIME_OUT << 16; |
fa990781 | 147 | rtn = BLK_EH_HANDLED; |
1da177e4 | 148 | } |
242f9dcb | 149 | |
fa990781 | 150 | return rtn; |
1da177e4 LT |
151 | } |
152 | ||
153 | /** | |
154 | * scsi_block_when_processing_errors - Prevent cmds from being queued. | |
155 | * @sdev: Device on which we are performing recovery. | |
156 | * | |
157 | * Description: | |
158 | * We block until the host is out of error recovery, and then check to | |
159 | * see whether the host or the device is offline. | |
160 | * | |
161 | * Return value: | |
162 | * 0 when dev was taken offline by error recovery. 1 OK to proceed. | |
dc8875e1 | 163 | */ |
1da177e4 LT |
164 | int scsi_block_when_processing_errors(struct scsi_device *sdev) |
165 | { | |
166 | int online; | |
167 | ||
939647ee | 168 | wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host)); |
1da177e4 LT |
169 | |
170 | online = scsi_device_online(sdev); | |
171 | ||
cadbd4a5 | 172 | SCSI_LOG_ERROR_RECOVERY(5, printk("%s: rtn: %d\n", __func__, |
1da177e4 LT |
173 | online)); |
174 | ||
175 | return online; | |
176 | } | |
177 | EXPORT_SYMBOL(scsi_block_when_processing_errors); | |
178 | ||
179 | #ifdef CONFIG_SCSI_LOGGING | |
180 | /** | |
181 | * scsi_eh_prt_fail_stats - Log info on failures. | |
182 | * @shost: scsi host being recovered. | |
183 | * @work_q: Queue of scsi cmds to process. | |
dc8875e1 | 184 | */ |
1da177e4 LT |
185 | static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost, |
186 | struct list_head *work_q) | |
187 | { | |
188 | struct scsi_cmnd *scmd; | |
189 | struct scsi_device *sdev; | |
190 | int total_failures = 0; | |
191 | int cmd_failed = 0; | |
192 | int cmd_cancel = 0; | |
193 | int devices_failed = 0; | |
194 | ||
195 | shost_for_each_device(sdev, shost) { | |
196 | list_for_each_entry(scmd, work_q, eh_entry) { | |
197 | if (scmd->device == sdev) { | |
198 | ++total_failures; | |
3111b0d1 | 199 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) |
1da177e4 | 200 | ++cmd_cancel; |
0bf8c869 | 201 | else |
1da177e4 LT |
202 | ++cmd_failed; |
203 | } | |
204 | } | |
205 | ||
206 | if (cmd_cancel || cmd_failed) { | |
207 | SCSI_LOG_ERROR_RECOVERY(3, | |
9ccfc756 JB |
208 | sdev_printk(KERN_INFO, sdev, |
209 | "%s: cmds failed: %d, cancel: %d\n", | |
cadbd4a5 | 210 | __func__, cmd_failed, |
9ccfc756 | 211 | cmd_cancel)); |
1da177e4 LT |
212 | cmd_cancel = 0; |
213 | cmd_failed = 0; | |
214 | ++devices_failed; | |
215 | } | |
216 | } | |
217 | ||
218 | SCSI_LOG_ERROR_RECOVERY(2, printk("Total of %d commands on %d" | |
219 | " devices require eh work\n", | |
0bf8c869 | 220 | total_failures, devices_failed)); |
1da177e4 LT |
221 | } |
222 | #endif | |
223 | ||
224 | /** | |
225 | * scsi_check_sense - Examine scsi cmd sense | |
226 | * @scmd: Cmd to have sense checked. | |
227 | * | |
228 | * Return value: | |
63583cca | 229 | * SUCCESS or FAILED or NEEDS_RETRY or TARGET_ERROR |
1da177e4 LT |
230 | * |
231 | * Notes: | |
232 | * When a deferred error is detected the current command has | |
233 | * not been executed and needs retrying. | |
dc8875e1 | 234 | */ |
1da177e4 LT |
235 | static int scsi_check_sense(struct scsi_cmnd *scmd) |
236 | { | |
a6a8d9f8 | 237 | struct scsi_device *sdev = scmd->device; |
1da177e4 LT |
238 | struct scsi_sense_hdr sshdr; |
239 | ||
240 | if (! scsi_command_normalize_sense(scmd, &sshdr)) | |
241 | return FAILED; /* no valid sense data */ | |
242 | ||
243 | if (scsi_sense_is_deferred(&sshdr)) | |
244 | return NEEDS_RETRY; | |
245 | ||
a6a8d9f8 CS |
246 | if (sdev->scsi_dh_data && sdev->scsi_dh_data->scsi_dh && |
247 | sdev->scsi_dh_data->scsi_dh->check_sense) { | |
248 | int rc; | |
249 | ||
250 | rc = sdev->scsi_dh_data->scsi_dh->check_sense(sdev, &sshdr); | |
251 | if (rc != SCSI_RETURN_NOT_HANDLED) | |
252 | return rc; | |
253 | /* handler does not care. Drop down to default handling */ | |
254 | } | |
255 | ||
1da177e4 LT |
256 | /* |
257 | * Previous logic looked for FILEMARK, EOM or ILI which are | |
258 | * mainly associated with tapes and returned SUCCESS. | |
259 | */ | |
260 | if (sshdr.response_code == 0x70) { | |
261 | /* fixed format */ | |
262 | if (scmd->sense_buffer[2] & 0xe0) | |
263 | return SUCCESS; | |
264 | } else { | |
265 | /* | |
266 | * descriptor format: look for "stream commands sense data | |
267 | * descriptor" (see SSC-3). Assume single sense data | |
268 | * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG. | |
269 | */ | |
270 | if ((sshdr.additional_length > 3) && | |
271 | (scmd->sense_buffer[8] == 0x4) && | |
272 | (scmd->sense_buffer[11] & 0xe0)) | |
273 | return SUCCESS; | |
274 | } | |
275 | ||
276 | switch (sshdr.sense_key) { | |
277 | case NO_SENSE: | |
278 | return SUCCESS; | |
279 | case RECOVERED_ERROR: | |
280 | return /* soft_error */ SUCCESS; | |
281 | ||
282 | case ABORTED_COMMAND: | |
511e44f4 MP |
283 | if (sshdr.asc == 0x10) /* DIF */ |
284 | return SUCCESS; | |
285 | ||
1da177e4 LT |
286 | return NEEDS_RETRY; |
287 | case NOT_READY: | |
288 | case UNIT_ATTENTION: | |
289 | /* | |
290 | * if we are expecting a cc/ua because of a bus reset that we | |
291 | * performed, treat this just as a retry. otherwise this is | |
292 | * information that we should pass up to the upper-level driver | |
293 | * so that we can deal with it there. | |
294 | */ | |
295 | if (scmd->device->expecting_cc_ua) { | |
dfcf7775 TH |
296 | /* |
297 | * Because some device does not queue unit | |
298 | * attentions correctly, we carefully check | |
299 | * additional sense code and qualifier so as | |
300 | * not to squash media change unit attention. | |
301 | */ | |
302 | if (sshdr.asc != 0x28 || sshdr.ascq != 0x00) { | |
303 | scmd->device->expecting_cc_ua = 0; | |
304 | return NEEDS_RETRY; | |
305 | } | |
1da177e4 LT |
306 | } |
307 | /* | |
0bf8c869 | 308 | * if the device is in the process of becoming ready, we |
1da177e4 LT |
309 | * should retry. |
310 | */ | |
311 | if ((sshdr.asc == 0x04) && (sshdr.ascq == 0x01)) | |
312 | return NEEDS_RETRY; | |
313 | /* | |
314 | * if the device is not started, we need to wake | |
315 | * the error handler to start the motor | |
316 | */ | |
317 | if (scmd->device->allow_restart && | |
318 | (sshdr.asc == 0x04) && (sshdr.ascq == 0x02)) | |
319 | return FAILED; | |
77a42297 | 320 | |
6e49949c MC |
321 | if (sshdr.asc == 0x3f && sshdr.ascq == 0x0e) |
322 | scmd_printk(KERN_WARNING, scmd, | |
323 | "Warning! Received an indication that the " | |
324 | "LUN assignments on this target have " | |
325 | "changed. The Linux SCSI layer does not " | |
326 | "automatically remap LUN assignments.\n"); | |
327 | else if (sshdr.asc == 0x3f) | |
328 | scmd_printk(KERN_WARNING, scmd, | |
329 | "Warning! Received an indication that the " | |
330 | "operating parameters on this target have " | |
331 | "changed. The Linux SCSI layer does not " | |
332 | "automatically adjust these parameters.\n"); | |
333 | ||
deb1cb63 SI |
334 | if (sshdr.asc == 0x38 && sshdr.ascq == 0x07) |
335 | scmd_printk(KERN_WARNING, scmd, | |
336 | "Warning! Received an indication that the " | |
337 | "LUN reached a thin provisioning soft " | |
338 | "threshold.\n"); | |
339 | ||
02e031cb CH |
340 | /* |
341 | * Pass the UA upwards for a determination in the completion | |
342 | * functions. | |
343 | */ | |
344 | return SUCCESS; | |
1da177e4 | 345 | |
63583cca | 346 | /* these are not supported */ |
1da177e4 LT |
347 | case COPY_ABORTED: |
348 | case VOLUME_OVERFLOW: | |
349 | case MISCOMPARE: | |
63583cca HR |
350 | case BLANK_CHECK: |
351 | case DATA_PROTECT: | |
352 | return TARGET_ERROR; | |
1da177e4 LT |
353 | |
354 | case MEDIUM_ERROR: | |
fd1b494d LT |
355 | if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */ |
356 | sshdr.asc == 0x13 || /* AMNF DATA FIELD */ | |
357 | sshdr.asc == 0x14) { /* RECORD NOT FOUND */ | |
63583cca | 358 | return TARGET_ERROR; |
fd1b494d | 359 | } |
1da177e4 LT |
360 | return NEEDS_RETRY; |
361 | ||
362 | case HARDWARE_ERROR: | |
363 | if (scmd->device->retry_hwerror) | |
bb0003c1 | 364 | return ADD_TO_MLQUEUE; |
1da177e4 | 365 | else |
63583cca | 366 | return TARGET_ERROR; |
1da177e4 LT |
367 | |
368 | case ILLEGAL_REQUEST: | |
1da177e4 LT |
369 | default: |
370 | return SUCCESS; | |
371 | } | |
372 | } | |
373 | ||
4a84067d VD |
374 | static void scsi_handle_queue_ramp_up(struct scsi_device *sdev) |
375 | { | |
376 | struct scsi_host_template *sht = sdev->host->hostt; | |
377 | struct scsi_device *tmp_sdev; | |
378 | ||
379 | if (!sht->change_queue_depth || | |
380 | sdev->queue_depth >= sdev->max_queue_depth) | |
381 | return; | |
382 | ||
383 | if (time_before(jiffies, | |
384 | sdev->last_queue_ramp_up + sdev->queue_ramp_up_period)) | |
385 | return; | |
386 | ||
387 | if (time_before(jiffies, | |
388 | sdev->last_queue_full_time + sdev->queue_ramp_up_period)) | |
389 | return; | |
390 | ||
391 | /* | |
392 | * Walk all devices of a target and do | |
393 | * ramp up on them. | |
394 | */ | |
395 | shost_for_each_device(tmp_sdev, sdev->host) { | |
396 | if (tmp_sdev->channel != sdev->channel || | |
397 | tmp_sdev->id != sdev->id || | |
398 | tmp_sdev->queue_depth == sdev->max_queue_depth) | |
399 | continue; | |
400 | /* | |
401 | * call back into LLD to increase queue_depth by one | |
402 | * with ramp up reason code. | |
403 | */ | |
404 | sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1, | |
405 | SCSI_QDEPTH_RAMP_UP); | |
406 | sdev->last_queue_ramp_up = jiffies; | |
407 | } | |
408 | } | |
409 | ||
42a6a918 MC |
410 | static void scsi_handle_queue_full(struct scsi_device *sdev) |
411 | { | |
412 | struct scsi_host_template *sht = sdev->host->hostt; | |
413 | struct scsi_device *tmp_sdev; | |
414 | ||
415 | if (!sht->change_queue_depth) | |
416 | return; | |
417 | ||
418 | shost_for_each_device(tmp_sdev, sdev->host) { | |
419 | if (tmp_sdev->channel != sdev->channel || | |
420 | tmp_sdev->id != sdev->id) | |
421 | continue; | |
422 | /* | |
423 | * We do not know the number of commands that were at | |
424 | * the device when we got the queue full so we start | |
425 | * from the highest possible value and work our way down. | |
426 | */ | |
427 | sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth - 1, | |
428 | SCSI_QDEPTH_QFULL); | |
429 | } | |
430 | } | |
431 | ||
1da177e4 LT |
432 | /** |
433 | * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD. | |
434 | * @scmd: SCSI cmd to examine. | |
435 | * | |
436 | * Notes: | |
437 | * This is *only* called when we are examining the status of commands | |
438 | * queued during error recovery. the main difference here is that we | |
439 | * don't allow for the possibility of retries here, and we are a lot | |
440 | * more restrictive about what we consider acceptable. | |
dc8875e1 | 441 | */ |
1da177e4 LT |
442 | static int scsi_eh_completed_normally(struct scsi_cmnd *scmd) |
443 | { | |
444 | /* | |
445 | * first check the host byte, to see if there is anything in there | |
446 | * that would indicate what we need to do. | |
447 | */ | |
448 | if (host_byte(scmd->result) == DID_RESET) { | |
449 | /* | |
450 | * rats. we are already in the error handler, so we now | |
451 | * get to try and figure out what to do next. if the sense | |
452 | * is valid, we have a pretty good idea of what to do. | |
453 | * if not, we mark it as FAILED. | |
454 | */ | |
455 | return scsi_check_sense(scmd); | |
456 | } | |
457 | if (host_byte(scmd->result) != DID_OK) | |
458 | return FAILED; | |
459 | ||
460 | /* | |
461 | * next, check the message byte. | |
462 | */ | |
463 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
464 | return FAILED; | |
465 | ||
466 | /* | |
467 | * now, check the status byte to see if this indicates | |
468 | * anything special. | |
469 | */ | |
470 | switch (status_byte(scmd->result)) { | |
471 | case GOOD: | |
4a84067d | 472 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 LT |
473 | case COMMAND_TERMINATED: |
474 | return SUCCESS; | |
475 | case CHECK_CONDITION: | |
476 | return scsi_check_sense(scmd); | |
477 | case CONDITION_GOOD: | |
478 | case INTERMEDIATE_GOOD: | |
479 | case INTERMEDIATE_C_GOOD: | |
480 | /* | |
481 | * who knows? FIXME(eric) | |
482 | */ | |
483 | return SUCCESS; | |
5f91bb05 | 484 | case RESERVATION_CONFLICT: |
67110dfd JB |
485 | if (scmd->cmnd[0] == TEST_UNIT_READY) |
486 | /* it is a success, we probed the device and | |
487 | * found it */ | |
488 | return SUCCESS; | |
489 | /* otherwise, we failed to send the command */ | |
490 | return FAILED; | |
1da177e4 | 491 | case QUEUE_FULL: |
42a6a918 MC |
492 | scsi_handle_queue_full(scmd->device); |
493 | /* fall through */ | |
494 | case BUSY: | |
3eb3a928 | 495 | return NEEDS_RETRY; |
1da177e4 LT |
496 | default: |
497 | return FAILED; | |
498 | } | |
499 | return FAILED; | |
500 | } | |
501 | ||
1da177e4 LT |
502 | /** |
503 | * scsi_eh_done - Completion function for error handling. | |
504 | * @scmd: Cmd that is done. | |
dc8875e1 | 505 | */ |
1da177e4 LT |
506 | static void scsi_eh_done(struct scsi_cmnd *scmd) |
507 | { | |
0bf8c869 | 508 | struct completion *eh_action; |
85631672 | 509 | |
7dfdc9a5 CH |
510 | SCSI_LOG_ERROR_RECOVERY(3, |
511 | printk("%s scmd: %p result: %x\n", | |
cadbd4a5 | 512 | __func__, scmd, scmd->result)); |
85631672 MR |
513 | |
514 | eh_action = scmd->device->host->eh_action; | |
515 | if (eh_action) | |
516 | complete(eh_action); | |
1da177e4 LT |
517 | } |
518 | ||
292148f8 BK |
519 | /** |
520 | * scsi_try_host_reset - ask host adapter to reset itself | |
521 | * @scmd: SCSI cmd to send hsot reset. | |
dc8875e1 | 522 | */ |
292148f8 BK |
523 | static int scsi_try_host_reset(struct scsi_cmnd *scmd) |
524 | { | |
525 | unsigned long flags; | |
526 | int rtn; | |
0bf8c869 JJ |
527 | struct Scsi_Host *host = scmd->device->host; |
528 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 BK |
529 | |
530 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Host RST\n", | |
cadbd4a5 | 531 | __func__)); |
292148f8 | 532 | |
0bf8c869 | 533 | if (!hostt->eh_host_reset_handler) |
292148f8 BK |
534 | return FAILED; |
535 | ||
0bf8c869 | 536 | rtn = hostt->eh_host_reset_handler(scmd); |
292148f8 BK |
537 | |
538 | if (rtn == SUCCESS) { | |
0bf8c869 | 539 | if (!hostt->skip_settle_delay) |
292148f8 | 540 | ssleep(HOST_RESET_SETTLE_TIME); |
0bf8c869 JJ |
541 | spin_lock_irqsave(host->host_lock, flags); |
542 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
543 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
544 | } |
545 | ||
546 | return rtn; | |
547 | } | |
548 | ||
549 | /** | |
550 | * scsi_try_bus_reset - ask host to perform a bus reset | |
551 | * @scmd: SCSI cmd to send bus reset. | |
dc8875e1 | 552 | */ |
292148f8 BK |
553 | static int scsi_try_bus_reset(struct scsi_cmnd *scmd) |
554 | { | |
555 | unsigned long flags; | |
556 | int rtn; | |
0bf8c869 JJ |
557 | struct Scsi_Host *host = scmd->device->host; |
558 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 BK |
559 | |
560 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Bus RST\n", | |
cadbd4a5 | 561 | __func__)); |
292148f8 | 562 | |
0bf8c869 | 563 | if (!hostt->eh_bus_reset_handler) |
292148f8 BK |
564 | return FAILED; |
565 | ||
0bf8c869 | 566 | rtn = hostt->eh_bus_reset_handler(scmd); |
292148f8 BK |
567 | |
568 | if (rtn == SUCCESS) { | |
0bf8c869 | 569 | if (!hostt->skip_settle_delay) |
292148f8 | 570 | ssleep(BUS_RESET_SETTLE_TIME); |
0bf8c869 JJ |
571 | spin_lock_irqsave(host->host_lock, flags); |
572 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
573 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
574 | } |
575 | ||
576 | return rtn; | |
577 | } | |
578 | ||
30bd7df8 MC |
579 | static void __scsi_report_device_reset(struct scsi_device *sdev, void *data) |
580 | { | |
581 | sdev->was_reset = 1; | |
582 | sdev->expecting_cc_ua = 1; | |
583 | } | |
584 | ||
585 | /** | |
586 | * scsi_try_target_reset - Ask host to perform a target reset | |
587 | * @scmd: SCSI cmd used to send a target reset | |
588 | * | |
589 | * Notes: | |
590 | * There is no timeout for this operation. if this operation is | |
591 | * unreliable for a given host, then the host itself needs to put a | |
592 | * timer on it, and set the host back to a consistent state prior to | |
593 | * returning. | |
594 | */ | |
595 | static int scsi_try_target_reset(struct scsi_cmnd *scmd) | |
596 | { | |
597 | unsigned long flags; | |
598 | int rtn; | |
0bf8c869 JJ |
599 | struct Scsi_Host *host = scmd->device->host; |
600 | struct scsi_host_template *hostt = host->hostt; | |
30bd7df8 | 601 | |
0bf8c869 | 602 | if (!hostt->eh_target_reset_handler) |
30bd7df8 MC |
603 | return FAILED; |
604 | ||
0bf8c869 | 605 | rtn = hostt->eh_target_reset_handler(scmd); |
30bd7df8 | 606 | if (rtn == SUCCESS) { |
0bf8c869 | 607 | spin_lock_irqsave(host->host_lock, flags); |
30bd7df8 MC |
608 | __starget_for_each_device(scsi_target(scmd->device), NULL, |
609 | __scsi_report_device_reset); | |
0bf8c869 | 610 | spin_unlock_irqrestore(host->host_lock, flags); |
30bd7df8 MC |
611 | } |
612 | ||
613 | return rtn; | |
614 | } | |
615 | ||
292148f8 BK |
616 | /** |
617 | * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev | |
618 | * @scmd: SCSI cmd used to send BDR | |
619 | * | |
620 | * Notes: | |
621 | * There is no timeout for this operation. if this operation is | |
622 | * unreliable for a given host, then the host itself needs to put a | |
623 | * timer on it, and set the host back to a consistent state prior to | |
624 | * returning. | |
dc8875e1 | 625 | */ |
292148f8 BK |
626 | static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd) |
627 | { | |
628 | int rtn; | |
0bf8c869 | 629 | struct scsi_host_template *hostt = scmd->device->host->hostt; |
292148f8 | 630 | |
0bf8c869 | 631 | if (!hostt->eh_device_reset_handler) |
292148f8 BK |
632 | return FAILED; |
633 | ||
0bf8c869 | 634 | rtn = hostt->eh_device_reset_handler(scmd); |
30bd7df8 MC |
635 | if (rtn == SUCCESS) |
636 | __scsi_report_device_reset(scmd->device, NULL); | |
292148f8 BK |
637 | return rtn; |
638 | } | |
639 | ||
0bf8c869 | 640 | static int scsi_try_to_abort_cmd(struct scsi_host_template *hostt, struct scsi_cmnd *scmd) |
292148f8 | 641 | { |
0bf8c869 | 642 | if (!hostt->eh_abort_handler) |
292148f8 BK |
643 | return FAILED; |
644 | ||
0bf8c869 | 645 | return hostt->eh_abort_handler(scmd); |
292148f8 BK |
646 | } |
647 | ||
292148f8 BK |
648 | static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd) |
649 | { | |
0bf8c869 | 650 | if (scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd) != SUCCESS) |
292148f8 | 651 | if (scsi_try_bus_device_reset(scmd) != SUCCESS) |
30bd7df8 MC |
652 | if (scsi_try_target_reset(scmd) != SUCCESS) |
653 | if (scsi_try_bus_reset(scmd) != SUCCESS) | |
654 | scsi_try_host_reset(scmd); | |
292148f8 BK |
655 | } |
656 | ||
1da177e4 | 657 | /** |
e1c23468 | 658 | * scsi_eh_prep_cmnd - Save a scsi command info as part of error recory |
2dc611de | 659 | * @scmd: SCSI command structure to hijack |
e1c23468 | 660 | * @ses: structure to save restore information |
55db6c1b | 661 | * @cmnd: CDB to send. Can be NULL if no new cmnd is needed |
64a87b24 | 662 | * @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB) |
55db6c1b | 663 | * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored) |
2dc611de | 664 | * |
e1c23468 | 665 | * This function is used to save a scsi command information before re-execution |
55db6c1b BH |
666 | * as part of the error recovery process. If @sense_bytes is 0 the command |
667 | * sent must be one that does not transfer any data. If @sense_bytes != 0 | |
668 | * @cmnd is ignored and this functions sets up a REQUEST_SENSE command | |
669 | * and cmnd buffers to read @sense_bytes into @scmd->sense_buffer. | |
dc8875e1 | 670 | */ |
e1c23468 BH |
671 | void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, |
672 | unsigned char *cmnd, int cmnd_size, unsigned sense_bytes) | |
1da177e4 | 673 | { |
f59114b7 | 674 | struct scsi_device *sdev = scmd->device; |
1da177e4 | 675 | |
631c228c CH |
676 | /* |
677 | * We need saved copies of a number of fields - this is because | |
678 | * error handling may need to overwrite these with different values | |
679 | * to run different commands, and once error handling is complete, | |
680 | * we will need to restore these values prior to running the actual | |
681 | * command. | |
682 | */ | |
e1c23468 | 683 | ses->cmd_len = scmd->cmd_len; |
64a87b24 | 684 | ses->cmnd = scmd->cmnd; |
e1c23468 | 685 | ses->data_direction = scmd->sc_data_direction; |
30b0c37b | 686 | ses->sdb = scmd->sdb; |
6f9a35e2 | 687 | ses->next_rq = scmd->request->next_rq; |
e1c23468 | 688 | ses->result = scmd->result; |
12265709 | 689 | ses->underflow = scmd->underflow; |
db007fc5 | 690 | ses->prot_op = scmd->prot_op; |
631c228c | 691 | |
db007fc5 | 692 | scmd->prot_op = SCSI_PROT_NORMAL; |
64a87b24 BH |
693 | scmd->cmnd = ses->eh_cmnd; |
694 | memset(scmd->cmnd, 0, BLK_MAX_CDB); | |
30b0c37b | 695 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
6f9a35e2 | 696 | scmd->request->next_rq = NULL; |
30b0c37b | 697 | |
55db6c1b | 698 | if (sense_bytes) { |
30b0c37b BH |
699 | scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE, |
700 | sense_bytes); | |
e1c23468 | 701 | sg_init_one(&ses->sense_sgl, scmd->sense_buffer, |
30b0c37b BH |
702 | scmd->sdb.length); |
703 | scmd->sdb.table.sgl = &ses->sense_sgl; | |
55db6c1b | 704 | scmd->sc_data_direction = DMA_FROM_DEVICE; |
30b0c37b | 705 | scmd->sdb.table.nents = 1; |
55db6c1b | 706 | scmd->cmnd[0] = REQUEST_SENSE; |
30b0c37b | 707 | scmd->cmnd[4] = scmd->sdb.length; |
55db6c1b | 708 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); |
631c228c | 709 | } else { |
631c228c | 710 | scmd->sc_data_direction = DMA_NONE; |
55db6c1b | 711 | if (cmnd) { |
64a87b24 | 712 | BUG_ON(cmnd_size > BLK_MAX_CDB); |
55db6c1b BH |
713 | memcpy(scmd->cmnd, cmnd, cmnd_size); |
714 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); | |
715 | } | |
631c228c CH |
716 | } |
717 | ||
718 | scmd->underflow = 0; | |
631c228c | 719 | |
55db6c1b | 720 | if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN) |
1da177e4 | 721 | scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) | |
f59114b7 | 722 | (sdev->lun << 5 & 0xe0); |
1da177e4 | 723 | |
631c228c CH |
724 | /* |
725 | * Zero the sense buffer. The scsi spec mandates that any | |
726 | * untransferred sense data should be interpreted as being zero. | |
727 | */ | |
b80ca4f7 | 728 | memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); |
e1c23468 BH |
729 | } |
730 | EXPORT_SYMBOL(scsi_eh_prep_cmnd); | |
731 | ||
732 | /** | |
733 | * scsi_eh_restore_cmnd - Restore a scsi command info as part of error recory | |
734 | * @scmd: SCSI command structure to restore | |
477e608c | 735 | * @ses: saved information from a coresponding call to scsi_eh_prep_cmnd |
e1c23468 | 736 | * |
477e608c | 737 | * Undo any damage done by above scsi_eh_prep_cmnd(). |
dc8875e1 | 738 | */ |
e1c23468 BH |
739 | void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses) |
740 | { | |
741 | /* | |
742 | * Restore original data | |
743 | */ | |
744 | scmd->cmd_len = ses->cmd_len; | |
64a87b24 | 745 | scmd->cmnd = ses->cmnd; |
e1c23468 | 746 | scmd->sc_data_direction = ses->data_direction; |
30b0c37b | 747 | scmd->sdb = ses->sdb; |
6f9a35e2 | 748 | scmd->request->next_rq = ses->next_rq; |
e1c23468 | 749 | scmd->result = ses->result; |
12265709 | 750 | scmd->underflow = ses->underflow; |
db007fc5 | 751 | scmd->prot_op = ses->prot_op; |
e1c23468 BH |
752 | } |
753 | EXPORT_SYMBOL(scsi_eh_restore_cmnd); | |
631c228c | 754 | |
e1c23468 BH |
755 | /** |
756 | * scsi_send_eh_cmnd - submit a scsi command as part of error recory | |
757 | * @scmd: SCSI command structure to hijack | |
758 | * @cmnd: CDB to send | |
759 | * @cmnd_size: size in bytes of @cmnd | |
760 | * @timeout: timeout for this request | |
761 | * @sense_bytes: size of sense data to copy or 0 | |
762 | * | |
763 | * This function is used to send a scsi command down to a target device | |
764 | * as part of the error recovery process. See also scsi_eh_prep_cmnd() above. | |
765 | * | |
766 | * Return value: | |
767 | * SUCCESS or FAILED or NEEDS_RETRY | |
dc8875e1 | 768 | */ |
e1c23468 BH |
769 | static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd, |
770 | int cmnd_size, int timeout, unsigned sense_bytes) | |
771 | { | |
772 | struct scsi_device *sdev = scmd->device; | |
773 | struct Scsi_Host *shost = sdev->host; | |
774 | DECLARE_COMPLETION_ONSTACK(done); | |
775 | unsigned long timeleft; | |
e1c23468 BH |
776 | struct scsi_eh_save ses; |
777 | int rtn; | |
778 | ||
779 | scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes); | |
7dfdc9a5 | 780 | shost->eh_action = &done; |
1da177e4 | 781 | |
1da177e4 | 782 | scsi_log_send(scmd); |
f281233d JG |
783 | scmd->scsi_done = scsi_eh_done; |
784 | shost->hostt->queuecommand(shost, scmd); | |
1da177e4 | 785 | |
7dfdc9a5 | 786 | timeleft = wait_for_completion_timeout(&done, timeout); |
1da177e4 | 787 | |
f59114b7 | 788 | shost->eh_action = NULL; |
1da177e4 | 789 | |
7dfdc9a5 | 790 | scsi_log_completion(scmd, SUCCESS); |
1da177e4 | 791 | |
7dfdc9a5 CH |
792 | SCSI_LOG_ERROR_RECOVERY(3, |
793 | printk("%s: scmd: %p, timeleft: %ld\n", | |
cadbd4a5 | 794 | __func__, scmd, timeleft)); |
1da177e4 LT |
795 | |
796 | /* | |
7dfdc9a5 CH |
797 | * If there is time left scsi_eh_done got called, and we will |
798 | * examine the actual status codes to see whether the command | |
799 | * actually did complete normally, else tell the host to forget | |
800 | * about this command. | |
1da177e4 | 801 | */ |
7dfdc9a5 | 802 | if (timeleft) { |
1da177e4 LT |
803 | rtn = scsi_eh_completed_normally(scmd); |
804 | SCSI_LOG_ERROR_RECOVERY(3, | |
805 | printk("%s: scsi_eh_completed_normally %x\n", | |
cadbd4a5 | 806 | __func__, rtn)); |
7dfdc9a5 | 807 | |
1da177e4 LT |
808 | switch (rtn) { |
809 | case SUCCESS: | |
810 | case NEEDS_RETRY: | |
811 | case FAILED: | |
63583cca | 812 | case TARGET_ERROR: |
1da177e4 | 813 | break; |
6e883b0e HR |
814 | case ADD_TO_MLQUEUE: |
815 | rtn = NEEDS_RETRY; | |
816 | break; | |
1da177e4 LT |
817 | default: |
818 | rtn = FAILED; | |
819 | break; | |
820 | } | |
7dfdc9a5 | 821 | } else { |
292148f8 | 822 | scsi_abort_eh_cmnd(scmd); |
7dfdc9a5 | 823 | rtn = FAILED; |
1da177e4 LT |
824 | } |
825 | ||
e1c23468 | 826 | scsi_eh_restore_cmnd(scmd, &ses); |
1da177e4 LT |
827 | return rtn; |
828 | } | |
829 | ||
830 | /** | |
831 | * scsi_request_sense - Request sense data from a particular target. | |
832 | * @scmd: SCSI cmd for request sense. | |
833 | * | |
834 | * Notes: | |
835 | * Some hosts automatically obtain this information, others require | |
836 | * that we obtain it on our own. This function will *not* return until | |
837 | * the command either times out, or it completes. | |
dc8875e1 | 838 | */ |
1da177e4 LT |
839 | static int scsi_request_sense(struct scsi_cmnd *scmd) |
840 | { | |
55db6c1b | 841 | return scsi_send_eh_cmnd(scmd, NULL, 0, SENSE_TIMEOUT, ~0); |
1da177e4 LT |
842 | } |
843 | ||
844 | /** | |
845 | * scsi_eh_finish_cmd - Handle a cmd that eh is finished with. | |
846 | * @scmd: Original SCSI cmd that eh has finished. | |
847 | * @done_q: Queue for processed commands. | |
848 | * | |
849 | * Notes: | |
850 | * We don't want to use the normal command completion while we are are | |
851 | * still handling errors - it may cause other commands to be queued, | |
eb44820c | 852 | * and that would disturb what we are doing. Thus we really want to |
1da177e4 LT |
853 | * keep a list of pending commands for final completion, and once we |
854 | * are ready to leave error handling we handle completion for real. | |
dc8875e1 | 855 | */ |
041c5fc3 | 856 | void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q) |
1da177e4 LT |
857 | { |
858 | scmd->device->host->host_failed--; | |
3111b0d1 | 859 | scmd->eh_eflags = 0; |
1da177e4 LT |
860 | list_move_tail(&scmd->eh_entry, done_q); |
861 | } | |
041c5fc3 | 862 | EXPORT_SYMBOL(scsi_eh_finish_cmd); |
1da177e4 LT |
863 | |
864 | /** | |
865 | * scsi_eh_get_sense - Get device sense data. | |
866 | * @work_q: Queue of commands to process. | |
eb44820c | 867 | * @done_q: Queue of processed commands. |
1da177e4 LT |
868 | * |
869 | * Description: | |
870 | * See if we need to request sense information. if so, then get it | |
0bf8c869 | 871 | * now, so we have a better idea of what to do. |
1da177e4 LT |
872 | * |
873 | * Notes: | |
874 | * This has the unfortunate side effect that if a shost adapter does | |
eb44820c | 875 | * not automatically request sense information, we end up shutting |
1da177e4 LT |
876 | * it down before we request it. |
877 | * | |
878 | * All drivers should request sense information internally these days, | |
879 | * so for now all I have to say is tough noogies if you end up in here. | |
880 | * | |
881 | * XXX: Long term this code should go away, but that needs an audit of | |
882 | * all LLDDs first. | |
dc8875e1 | 883 | */ |
dca84e46 DW |
884 | int scsi_eh_get_sense(struct list_head *work_q, |
885 | struct list_head *done_q) | |
1da177e4 | 886 | { |
937abeaa | 887 | struct scsi_cmnd *scmd, *next; |
1da177e4 LT |
888 | int rtn; |
889 | ||
937abeaa | 890 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 891 | if ((scmd->eh_eflags & SCSI_EH_CANCEL_CMD) || |
1da177e4 LT |
892 | SCSI_SENSE_VALID(scmd)) |
893 | continue; | |
894 | ||
3bf743e7 JG |
895 | SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd, |
896 | "%s: requesting sense\n", | |
897 | current->comm)); | |
1da177e4 LT |
898 | rtn = scsi_request_sense(scmd); |
899 | if (rtn != SUCCESS) | |
900 | continue; | |
901 | ||
902 | SCSI_LOG_ERROR_RECOVERY(3, printk("sense requested for %p" | |
903 | " result %x\n", scmd, | |
904 | scmd->result)); | |
905 | SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense("bh", scmd)); | |
906 | ||
907 | rtn = scsi_decide_disposition(scmd); | |
908 | ||
909 | /* | |
910 | * if the result was normal, then just pass it along to the | |
911 | * upper level. | |
912 | */ | |
913 | if (rtn == SUCCESS) | |
914 | /* we don't want this command reissued, just | |
915 | * finished with the sense data, so set | |
916 | * retries to the max allowed to ensure it | |
917 | * won't get reissued */ | |
918 | scmd->retries = scmd->allowed; | |
919 | else if (rtn != NEEDS_RETRY) | |
920 | continue; | |
921 | ||
922 | scsi_eh_finish_cmd(scmd, done_q); | |
923 | } | |
924 | ||
925 | return list_empty(work_q); | |
926 | } | |
dca84e46 | 927 | EXPORT_SYMBOL_GPL(scsi_eh_get_sense); |
1da177e4 | 928 | |
1da177e4 LT |
929 | /** |
930 | * scsi_eh_tur - Send TUR to device. | |
eb44820c | 931 | * @scmd: &scsi_cmnd to send TUR |
1da177e4 LT |
932 | * |
933 | * Return value: | |
934 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 935 | */ |
1da177e4 LT |
936 | static int scsi_eh_tur(struct scsi_cmnd *scmd) |
937 | { | |
938 | static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0}; | |
939 | int retry_cnt = 1, rtn; | |
940 | ||
941 | retry_tur: | |
0db99e33 | 942 | rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, SENSE_TIMEOUT, 0); |
1da177e4 | 943 | |
1da177e4 | 944 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd %p rtn %x\n", |
cadbd4a5 | 945 | __func__, scmd, rtn)); |
631c228c CH |
946 | |
947 | switch (rtn) { | |
948 | case NEEDS_RETRY: | |
1da177e4 LT |
949 | if (retry_cnt--) |
950 | goto retry_tur; | |
631c228c CH |
951 | /*FALLTHRU*/ |
952 | case SUCCESS: | |
e47373ec | 953 | return 0; |
631c228c CH |
954 | default: |
955 | return 1; | |
e47373ec | 956 | } |
1da177e4 LT |
957 | } |
958 | ||
3eef6257 DJ |
959 | /** |
960 | * scsi_eh_test_devices - check if devices are responding from error recovery. | |
961 | * @cmd_list: scsi commands in error recovery. | |
962 | * @work_q: queue for commands which still need more error recovery | |
963 | * @done_q: queue for commands which are finished | |
964 | * @try_stu: boolean on if a STU command should be tried in addition to TUR. | |
965 | * | |
966 | * Decription: | |
967 | * Tests if devices are in a working state. Commands to devices now in | |
968 | * a working state are sent to the done_q while commands to devices which | |
969 | * are still failing to respond are returned to the work_q for more | |
970 | * processing. | |
971 | **/ | |
972 | static int scsi_eh_test_devices(struct list_head *cmd_list, | |
973 | struct list_head *work_q, | |
974 | struct list_head *done_q, int try_stu) | |
975 | { | |
976 | struct scsi_cmnd *scmd, *next; | |
977 | struct scsi_device *sdev; | |
978 | int finish_cmds; | |
979 | ||
980 | while (!list_empty(cmd_list)) { | |
981 | scmd = list_entry(cmd_list->next, struct scsi_cmnd, eh_entry); | |
982 | sdev = scmd->device; | |
983 | ||
984 | finish_cmds = !scsi_device_online(scmd->device) || | |
985 | (try_stu && !scsi_eh_try_stu(scmd) && | |
986 | !scsi_eh_tur(scmd)) || | |
987 | !scsi_eh_tur(scmd); | |
988 | ||
989 | list_for_each_entry_safe(scmd, next, cmd_list, eh_entry) | |
990 | if (scmd->device == sdev) { | |
991 | if (finish_cmds) | |
992 | scsi_eh_finish_cmd(scmd, done_q); | |
993 | else | |
994 | list_move_tail(&scmd->eh_entry, work_q); | |
995 | } | |
996 | } | |
997 | return list_empty(work_q); | |
998 | } | |
999 | ||
1000 | ||
1da177e4 | 1001 | /** |
eb44820c RL |
1002 | * scsi_eh_abort_cmds - abort pending commands. |
1003 | * @work_q: &list_head for pending commands. | |
1004 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1005 | * |
1006 | * Decription: | |
1007 | * Try and see whether or not it makes sense to try and abort the | |
eb44820c RL |
1008 | * running command. This only works out to be the case if we have one |
1009 | * command that has timed out. If the command simply failed, it makes | |
1da177e4 LT |
1010 | * no sense to try and abort the command, since as far as the shost |
1011 | * adapter is concerned, it isn't running. | |
dc8875e1 | 1012 | */ |
1da177e4 LT |
1013 | static int scsi_eh_abort_cmds(struct list_head *work_q, |
1014 | struct list_head *done_q) | |
1015 | { | |
937abeaa | 1016 | struct scsi_cmnd *scmd, *next; |
3eef6257 | 1017 | LIST_HEAD(check_list); |
1da177e4 LT |
1018 | int rtn; |
1019 | ||
937abeaa | 1020 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 1021 | if (!(scmd->eh_eflags & SCSI_EH_CANCEL_CMD)) |
1da177e4 LT |
1022 | continue; |
1023 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting cmd:" | |
1024 | "0x%p\n", current->comm, | |
1025 | scmd)); | |
0bf8c869 | 1026 | rtn = scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd); |
2f2eb587 | 1027 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
3111b0d1 | 1028 | scmd->eh_eflags &= ~SCSI_EH_CANCEL_CMD; |
3eef6257 | 1029 | if (rtn == FAST_IO_FAIL) |
1da177e4 | 1030 | scsi_eh_finish_cmd(scmd, done_q); |
3eef6257 DJ |
1031 | else |
1032 | list_move_tail(&scmd->eh_entry, &check_list); | |
1da177e4 LT |
1033 | } else |
1034 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting" | |
1035 | " cmd failed:" | |
1036 | "0x%p\n", | |
1037 | current->comm, | |
1038 | scmd)); | |
1039 | } | |
1040 | ||
3eef6257 | 1041 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4 LT |
1042 | } |
1043 | ||
1da177e4 LT |
1044 | /** |
1045 | * scsi_eh_try_stu - Send START_UNIT to device. | |
eb44820c | 1046 | * @scmd: &scsi_cmnd to send START_UNIT |
1da177e4 LT |
1047 | * |
1048 | * Return value: | |
1049 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1050 | */ |
1da177e4 LT |
1051 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd) |
1052 | { | |
1053 | static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0}; | |
1da177e4 | 1054 | |
631c228c | 1055 | if (scmd->device->allow_restart) { |
ed773e66 BK |
1056 | int i, rtn = NEEDS_RETRY; |
1057 | ||
1058 | for (i = 0; rtn == NEEDS_RETRY && i < 2; i++) | |
9728c081 | 1059 | rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0); |
1da177e4 | 1060 | |
631c228c CH |
1061 | if (rtn == SUCCESS) |
1062 | return 0; | |
1063 | } | |
1da177e4 | 1064 | |
1da177e4 LT |
1065 | return 1; |
1066 | } | |
1067 | ||
1068 | /** | |
1069 | * scsi_eh_stu - send START_UNIT if needed | |
eb44820c RL |
1070 | * @shost: &scsi host being recovered. |
1071 | * @work_q: &list_head for pending commands. | |
1072 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1073 | * |
1074 | * Notes: | |
1075 | * If commands are failing due to not ready, initializing command required, | |
0bf8c869 | 1076 | * try revalidating the device, which will end up sending a start unit. |
dc8875e1 | 1077 | */ |
1da177e4 LT |
1078 | static int scsi_eh_stu(struct Scsi_Host *shost, |
1079 | struct list_head *work_q, | |
1080 | struct list_head *done_q) | |
1081 | { | |
937abeaa | 1082 | struct scsi_cmnd *scmd, *stu_scmd, *next; |
1da177e4 LT |
1083 | struct scsi_device *sdev; |
1084 | ||
1085 | shost_for_each_device(sdev, shost) { | |
1086 | stu_scmd = NULL; | |
1087 | list_for_each_entry(scmd, work_q, eh_entry) | |
1088 | if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) && | |
1089 | scsi_check_sense(scmd) == FAILED ) { | |
1090 | stu_scmd = scmd; | |
1091 | break; | |
1092 | } | |
1093 | ||
1094 | if (!stu_scmd) | |
1095 | continue; | |
1096 | ||
1097 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending START_UNIT to sdev:" | |
1098 | " 0x%p\n", current->comm, sdev)); | |
1099 | ||
1100 | if (!scsi_eh_try_stu(stu_scmd)) { | |
1101 | if (!scsi_device_online(sdev) || | |
1102 | !scsi_eh_tur(stu_scmd)) { | |
937abeaa CH |
1103 | list_for_each_entry_safe(scmd, next, |
1104 | work_q, eh_entry) { | |
1da177e4 LT |
1105 | if (scmd->device == sdev) |
1106 | scsi_eh_finish_cmd(scmd, done_q); | |
1107 | } | |
1108 | } | |
1109 | } else { | |
1110 | SCSI_LOG_ERROR_RECOVERY(3, | |
1111 | printk("%s: START_UNIT failed to sdev:" | |
1112 | " 0x%p\n", current->comm, sdev)); | |
1113 | } | |
1114 | } | |
1115 | ||
1116 | return list_empty(work_q); | |
1117 | } | |
1118 | ||
1119 | ||
1120 | /** | |
1121 | * scsi_eh_bus_device_reset - send bdr if needed | |
1122 | * @shost: scsi host being recovered. | |
eb44820c RL |
1123 | * @work_q: &list_head for pending commands. |
1124 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1125 | * |
1126 | * Notes: | |
eb44820c | 1127 | * Try a bus device reset. Still, look to see whether we have multiple |
1da177e4 LT |
1128 | * devices that are jammed or not - if we have multiple devices, it |
1129 | * makes no sense to try bus_device_reset - we really would need to try | |
0bf8c869 | 1130 | * a bus_reset instead. |
dc8875e1 | 1131 | */ |
1da177e4 LT |
1132 | static int scsi_eh_bus_device_reset(struct Scsi_Host *shost, |
1133 | struct list_head *work_q, | |
1134 | struct list_head *done_q) | |
1135 | { | |
937abeaa | 1136 | struct scsi_cmnd *scmd, *bdr_scmd, *next; |
1da177e4 LT |
1137 | struct scsi_device *sdev; |
1138 | int rtn; | |
1139 | ||
1140 | shost_for_each_device(sdev, shost) { | |
1141 | bdr_scmd = NULL; | |
1142 | list_for_each_entry(scmd, work_q, eh_entry) | |
1143 | if (scmd->device == sdev) { | |
1144 | bdr_scmd = scmd; | |
1145 | break; | |
1146 | } | |
1147 | ||
1148 | if (!bdr_scmd) | |
1149 | continue; | |
1150 | ||
1151 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BDR sdev:" | |
1152 | " 0x%p\n", current->comm, | |
1153 | sdev)); | |
1154 | rtn = scsi_try_bus_device_reset(bdr_scmd); | |
2f2eb587 | 1155 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
1da177e4 | 1156 | if (!scsi_device_online(sdev) || |
2f2eb587 | 1157 | rtn == FAST_IO_FAIL || |
1da177e4 | 1158 | !scsi_eh_tur(bdr_scmd)) { |
937abeaa CH |
1159 | list_for_each_entry_safe(scmd, next, |
1160 | work_q, eh_entry) { | |
1da177e4 LT |
1161 | if (scmd->device == sdev) |
1162 | scsi_eh_finish_cmd(scmd, | |
1163 | done_q); | |
1164 | } | |
1165 | } | |
1166 | } else { | |
1167 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BDR" | |
1168 | " failed sdev:" | |
1169 | "0x%p\n", | |
1170 | current->comm, | |
1171 | sdev)); | |
1172 | } | |
1173 | } | |
1174 | ||
1175 | return list_empty(work_q); | |
1176 | } | |
1177 | ||
30bd7df8 MC |
1178 | /** |
1179 | * scsi_eh_target_reset - send target reset if needed | |
1180 | * @shost: scsi host being recovered. | |
1181 | * @work_q: &list_head for pending commands. | |
1182 | * @done_q: &list_head for processed commands. | |
1183 | * | |
1184 | * Notes: | |
1185 | * Try a target reset. | |
1186 | */ | |
1187 | static int scsi_eh_target_reset(struct Scsi_Host *shost, | |
1188 | struct list_head *work_q, | |
1189 | struct list_head *done_q) | |
1190 | { | |
98db5195 | 1191 | LIST_HEAD(tmp_list); |
3eef6257 | 1192 | LIST_HEAD(check_list); |
30bd7df8 | 1193 | |
98db5195 JB |
1194 | list_splice_init(work_q, &tmp_list); |
1195 | ||
1196 | while (!list_empty(&tmp_list)) { | |
1197 | struct scsi_cmnd *next, *scmd; | |
1198 | int rtn; | |
1199 | unsigned int id; | |
1200 | ||
1201 | scmd = list_entry(tmp_list.next, struct scsi_cmnd, eh_entry); | |
1202 | id = scmd_id(scmd); | |
30bd7df8 MC |
1203 | |
1204 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending target reset " | |
1205 | "to target %d\n", | |
1206 | current->comm, id)); | |
98db5195 JB |
1207 | rtn = scsi_try_target_reset(scmd); |
1208 | if (rtn != SUCCESS && rtn != FAST_IO_FAIL) | |
30bd7df8 MC |
1209 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Target reset" |
1210 | " failed target: " | |
1211 | "%d\n", | |
1212 | current->comm, id)); | |
98db5195 JB |
1213 | list_for_each_entry_safe(scmd, next, &tmp_list, eh_entry) { |
1214 | if (scmd_id(scmd) != id) | |
1215 | continue; | |
1216 | ||
3eef6257 DJ |
1217 | if (rtn == SUCCESS) |
1218 | list_move_tail(&scmd->eh_entry, &check_list); | |
1219 | else if (rtn == FAST_IO_FAIL) | |
98db5195 JB |
1220 | scsi_eh_finish_cmd(scmd, done_q); |
1221 | else | |
1222 | /* push back on work queue for further processing */ | |
1223 | list_move(&scmd->eh_entry, work_q); | |
1224 | } | |
1225 | } | |
30bd7df8 | 1226 | |
3eef6257 | 1227 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
30bd7df8 MC |
1228 | } |
1229 | ||
1da177e4 | 1230 | /** |
0bf8c869 | 1231 | * scsi_eh_bus_reset - send a bus reset |
eb44820c RL |
1232 | * @shost: &scsi host being recovered. |
1233 | * @work_q: &list_head for pending commands. | |
1234 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1235 | */ |
1da177e4 LT |
1236 | static int scsi_eh_bus_reset(struct Scsi_Host *shost, |
1237 | struct list_head *work_q, | |
1238 | struct list_head *done_q) | |
1239 | { | |
937abeaa | 1240 | struct scsi_cmnd *scmd, *chan_scmd, *next; |
3eef6257 | 1241 | LIST_HEAD(check_list); |
1da177e4 LT |
1242 | unsigned int channel; |
1243 | int rtn; | |
1244 | ||
1245 | /* | |
1246 | * we really want to loop over the various channels, and do this on | |
1247 | * a channel by channel basis. we should also check to see if any | |
1248 | * of the failed commands are on soft_reset devices, and if so, skip | |
0bf8c869 | 1249 | * the reset. |
1da177e4 LT |
1250 | */ |
1251 | ||
1252 | for (channel = 0; channel <= shost->max_channel; channel++) { | |
1253 | chan_scmd = NULL; | |
1254 | list_for_each_entry(scmd, work_q, eh_entry) { | |
422c0d61 | 1255 | if (channel == scmd_channel(scmd)) { |
1da177e4 LT |
1256 | chan_scmd = scmd; |
1257 | break; | |
1258 | /* | |
1259 | * FIXME add back in some support for | |
1260 | * soft_reset devices. | |
1261 | */ | |
1262 | } | |
1263 | } | |
1264 | ||
1265 | if (!chan_scmd) | |
1266 | continue; | |
1267 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BRST chan:" | |
1268 | " %d\n", current->comm, | |
1269 | channel)); | |
1270 | rtn = scsi_try_bus_reset(chan_scmd); | |
2f2eb587 | 1271 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
937abeaa | 1272 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3eef6257 DJ |
1273 | if (channel == scmd_channel(scmd)) { |
1274 | if (rtn == FAST_IO_FAIL) | |
1da177e4 LT |
1275 | scsi_eh_finish_cmd(scmd, |
1276 | done_q); | |
3eef6257 DJ |
1277 | else |
1278 | list_move_tail(&scmd->eh_entry, | |
1279 | &check_list); | |
1280 | } | |
1da177e4 LT |
1281 | } |
1282 | } else { | |
1283 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BRST" | |
1284 | " failed chan: %d\n", | |
1285 | current->comm, | |
1286 | channel)); | |
1287 | } | |
1288 | } | |
3eef6257 | 1289 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4 LT |
1290 | } |
1291 | ||
1292 | /** | |
0bf8c869 | 1293 | * scsi_eh_host_reset - send a host reset |
1da177e4 LT |
1294 | * @work_q: list_head for processed commands. |
1295 | * @done_q: list_head for processed commands. | |
dc8875e1 | 1296 | */ |
1da177e4 LT |
1297 | static int scsi_eh_host_reset(struct list_head *work_q, |
1298 | struct list_head *done_q) | |
1299 | { | |
937abeaa | 1300 | struct scsi_cmnd *scmd, *next; |
3eef6257 | 1301 | LIST_HEAD(check_list); |
1da177e4 | 1302 | int rtn; |
1da177e4 LT |
1303 | |
1304 | if (!list_empty(work_q)) { | |
1305 | scmd = list_entry(work_q->next, | |
1306 | struct scsi_cmnd, eh_entry); | |
1307 | ||
1308 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending HRST\n" | |
1309 | , current->comm)); | |
1310 | ||
1311 | rtn = scsi_try_host_reset(scmd); | |
3eef6257 DJ |
1312 | if (rtn == SUCCESS) { |
1313 | list_splice_init(work_q, &check_list); | |
1314 | } else if (rtn == FAST_IO_FAIL) { | |
937abeaa | 1315 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1da177e4 LT |
1316 | scsi_eh_finish_cmd(scmd, done_q); |
1317 | } | |
1318 | } else { | |
1319 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: HRST" | |
1320 | " failed\n", | |
1321 | current->comm)); | |
1322 | } | |
1323 | } | |
3eef6257 | 1324 | return scsi_eh_test_devices(&check_list, work_q, done_q, 1); |
1da177e4 LT |
1325 | } |
1326 | ||
1327 | /** | |
1328 | * scsi_eh_offline_sdevs - offline scsi devices that fail to recover | |
1329 | * @work_q: list_head for processed commands. | |
1330 | * @done_q: list_head for processed commands. | |
dc8875e1 | 1331 | */ |
1da177e4 LT |
1332 | static void scsi_eh_offline_sdevs(struct list_head *work_q, |
1333 | struct list_head *done_q) | |
1334 | { | |
937abeaa | 1335 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1336 | |
937abeaa | 1337 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
31765d7d MW |
1338 | sdev_printk(KERN_INFO, scmd->device, "Device offlined - " |
1339 | "not ready after error recovery\n"); | |
1da177e4 | 1340 | scsi_device_set_state(scmd->device, SDEV_OFFLINE); |
3111b0d1 | 1341 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) { |
1da177e4 LT |
1342 | /* |
1343 | * FIXME: Handle lost cmds. | |
1344 | */ | |
1345 | } | |
1346 | scsi_eh_finish_cmd(scmd, done_q); | |
1347 | } | |
1348 | return; | |
1349 | } | |
1350 | ||
4a27446f MC |
1351 | /** |
1352 | * scsi_noretry_cmd - determinte if command should be failed fast | |
1353 | * @scmd: SCSI cmd to examine. | |
1354 | */ | |
1355 | int scsi_noretry_cmd(struct scsi_cmnd *scmd) | |
1356 | { | |
1357 | switch (host_byte(scmd->result)) { | |
1358 | case DID_OK: | |
1359 | break; | |
1360 | case DID_BUS_BUSY: | |
33659ebb | 1361 | return (scmd->request->cmd_flags & REQ_FAILFAST_TRANSPORT); |
4a27446f | 1362 | case DID_PARITY: |
33659ebb | 1363 | return (scmd->request->cmd_flags & REQ_FAILFAST_DEV); |
4a27446f MC |
1364 | case DID_ERROR: |
1365 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1366 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1367 | return 0; | |
1368 | /* fall through */ | |
1369 | case DID_SOFT_ERROR: | |
33659ebb | 1370 | return (scmd->request->cmd_flags & REQ_FAILFAST_DRIVER); |
4a27446f MC |
1371 | } |
1372 | ||
1373 | switch (status_byte(scmd->result)) { | |
1374 | case CHECK_CONDITION: | |
1375 | /* | |
1376 | * assume caller has checked sense and determinted | |
1377 | * the check condition was retryable. | |
1378 | */ | |
e96f6abe FT |
1379 | if (scmd->request->cmd_flags & REQ_FAILFAST_DEV || |
1380 | scmd->request->cmd_type == REQ_TYPE_BLOCK_PC) | |
1381 | return 1; | |
4a27446f MC |
1382 | } |
1383 | ||
1384 | return 0; | |
1385 | } | |
1386 | ||
1da177e4 LT |
1387 | /** |
1388 | * scsi_decide_disposition - Disposition a cmd on return from LLD. | |
1389 | * @scmd: SCSI cmd to examine. | |
1390 | * | |
1391 | * Notes: | |
1392 | * This is *only* called when we are examining the status after sending | |
1393 | * out the actual data command. any commands that are queued for error | |
1394 | * recovery (e.g. test_unit_ready) do *not* come through here. | |
1395 | * | |
1396 | * When this routine returns failed, it means the error handler thread | |
1397 | * is woken. In cases where the error code indicates an error that | |
1398 | * doesn't require the error handler read (i.e. we don't need to | |
1399 | * abort/reset), this function should return SUCCESS. | |
dc8875e1 | 1400 | */ |
1da177e4 LT |
1401 | int scsi_decide_disposition(struct scsi_cmnd *scmd) |
1402 | { | |
1403 | int rtn; | |
1404 | ||
1405 | /* | |
1406 | * if the device is offline, then we clearly just pass the result back | |
1407 | * up to the top level. | |
1408 | */ | |
1409 | if (!scsi_device_online(scmd->device)) { | |
1410 | SCSI_LOG_ERROR_RECOVERY(5, printk("%s: device offline - report" | |
1411 | " as SUCCESS\n", | |
cadbd4a5 | 1412 | __func__)); |
1da177e4 LT |
1413 | return SUCCESS; |
1414 | } | |
1415 | ||
1416 | /* | |
1417 | * first check the host byte, to see if there is anything in there | |
1418 | * that would indicate what we need to do. | |
1419 | */ | |
1420 | switch (host_byte(scmd->result)) { | |
1421 | case DID_PASSTHROUGH: | |
1422 | /* | |
1423 | * no matter what, pass this through to the upper layer. | |
1424 | * nuke this special code so that it looks like we are saying | |
1425 | * did_ok. | |
1426 | */ | |
1427 | scmd->result &= 0xff00ffff; | |
1428 | return SUCCESS; | |
1429 | case DID_OK: | |
1430 | /* | |
1431 | * looks good. drop through, and check the next byte. | |
1432 | */ | |
1433 | break; | |
1434 | case DID_NO_CONNECT: | |
1435 | case DID_BAD_TARGET: | |
1436 | case DID_ABORT: | |
1437 | /* | |
1438 | * note - this means that we just report the status back | |
1439 | * to the top level driver, not that we actually think | |
1440 | * that it indicates SUCCESS. | |
1441 | */ | |
1442 | return SUCCESS; | |
1443 | /* | |
1444 | * when the low level driver returns did_soft_error, | |
0bf8c869 | 1445 | * it is responsible for keeping an internal retry counter |
1da177e4 LT |
1446 | * in order to avoid endless loops (db) |
1447 | * | |
1448 | * actually this is a bug in this function here. we should | |
1449 | * be mindful of the maximum number of retries specified | |
1450 | * and not get stuck in a loop. | |
1451 | */ | |
1452 | case DID_SOFT_ERROR: | |
1453 | goto maybe_retry; | |
1454 | case DID_IMM_RETRY: | |
1455 | return NEEDS_RETRY; | |
1456 | ||
bf341919 | 1457 | case DID_REQUEUE: |
1458 | return ADD_TO_MLQUEUE; | |
a4dfaa6f MC |
1459 | case DID_TRANSPORT_DISRUPTED: |
1460 | /* | |
1461 | * LLD/transport was disrupted during processing of the IO. | |
1462 | * The transport class is now blocked/blocking, | |
1463 | * and the transport will decide what to do with the IO | |
939c2288 MC |
1464 | * based on its timers and recovery capablilities if |
1465 | * there are enough retries. | |
a4dfaa6f | 1466 | */ |
939c2288 | 1467 | goto maybe_retry; |
a4dfaa6f MC |
1468 | case DID_TRANSPORT_FAILFAST: |
1469 | /* | |
1470 | * The transport decided to failfast the IO (most likely | |
1471 | * the fast io fail tmo fired), so send IO directly upwards. | |
1472 | */ | |
1473 | return SUCCESS; | |
1da177e4 LT |
1474 | case DID_ERROR: |
1475 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1476 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1477 | /* | |
1478 | * execute reservation conflict processing code | |
1479 | * lower down | |
1480 | */ | |
1481 | break; | |
1482 | /* fallthrough */ | |
1da177e4 LT |
1483 | case DID_BUS_BUSY: |
1484 | case DID_PARITY: | |
1485 | goto maybe_retry; | |
1486 | case DID_TIME_OUT: | |
1487 | /* | |
1488 | * when we scan the bus, we get timeout messages for | |
1489 | * these commands if there is no device available. | |
1490 | * other hosts report did_no_connect for the same thing. | |
1491 | */ | |
1492 | if ((scmd->cmnd[0] == TEST_UNIT_READY || | |
1493 | scmd->cmnd[0] == INQUIRY)) { | |
1494 | return SUCCESS; | |
1495 | } else { | |
1496 | return FAILED; | |
1497 | } | |
1498 | case DID_RESET: | |
1499 | return SUCCESS; | |
1500 | default: | |
1501 | return FAILED; | |
1502 | } | |
1503 | ||
1504 | /* | |
1505 | * next, check the message byte. | |
1506 | */ | |
1507 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
1508 | return FAILED; | |
1509 | ||
1510 | /* | |
1511 | * check the status byte to see if this indicates anything special. | |
1512 | */ | |
1513 | switch (status_byte(scmd->result)) { | |
1514 | case QUEUE_FULL: | |
42a6a918 | 1515 | scsi_handle_queue_full(scmd->device); |
1da177e4 LT |
1516 | /* |
1517 | * the case of trying to send too many commands to a | |
1518 | * tagged queueing device. | |
1519 | */ | |
1520 | case BUSY: | |
1521 | /* | |
1522 | * device can't talk to us at the moment. Should only | |
1523 | * occur (SAM-3) when the task queue is empty, so will cause | |
1524 | * the empty queue handling to trigger a stall in the | |
1525 | * device. | |
1526 | */ | |
1527 | return ADD_TO_MLQUEUE; | |
1528 | case GOOD: | |
4a84067d | 1529 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 | 1530 | case COMMAND_TERMINATED: |
1da177e4 | 1531 | return SUCCESS; |
a9b589d9 VB |
1532 | case TASK_ABORTED: |
1533 | goto maybe_retry; | |
1da177e4 LT |
1534 | case CHECK_CONDITION: |
1535 | rtn = scsi_check_sense(scmd); | |
1536 | if (rtn == NEEDS_RETRY) | |
1537 | goto maybe_retry; | |
63583cca HR |
1538 | else if (rtn == TARGET_ERROR) { |
1539 | /* | |
1540 | * Need to modify host byte to signal a | |
1541 | * permanent target failure | |
1542 | */ | |
1543 | scmd->result |= (DID_TARGET_FAILURE << 16); | |
1544 | rtn = SUCCESS; | |
1545 | } | |
1da177e4 LT |
1546 | /* if rtn == FAILED, we have no sense information; |
1547 | * returning FAILED will wake the error handler thread | |
1548 | * to collect the sense and redo the decide | |
1549 | * disposition */ | |
1550 | return rtn; | |
1551 | case CONDITION_GOOD: | |
1552 | case INTERMEDIATE_GOOD: | |
1553 | case INTERMEDIATE_C_GOOD: | |
1554 | case ACA_ACTIVE: | |
1555 | /* | |
1556 | * who knows? FIXME(eric) | |
1557 | */ | |
1558 | return SUCCESS; | |
1559 | ||
1560 | case RESERVATION_CONFLICT: | |
9ccfc756 JB |
1561 | sdev_printk(KERN_INFO, scmd->device, |
1562 | "reservation conflict\n"); | |
63583cca | 1563 | scmd->result |= (DID_NEXUS_FAILURE << 16); |
1da177e4 LT |
1564 | return SUCCESS; /* causes immediate i/o error */ |
1565 | default: | |
1566 | return FAILED; | |
1567 | } | |
1568 | return FAILED; | |
1569 | ||
1570 | maybe_retry: | |
1571 | ||
1572 | /* we requeue for retry because the error was retryable, and | |
1573 | * the request was not marked fast fail. Note that above, | |
1574 | * even if the request is marked fast fail, we still requeue | |
1575 | * for queue congestion conditions (QUEUE_FULL or BUSY) */ | |
8884efab | 1576 | if ((++scmd->retries) <= scmd->allowed |
4a27446f | 1577 | && !scsi_noretry_cmd(scmd)) { |
1da177e4 LT |
1578 | return NEEDS_RETRY; |
1579 | } else { | |
1580 | /* | |
1581 | * no more retries - report this one back to upper level. | |
1582 | */ | |
1583 | return SUCCESS; | |
1584 | } | |
1585 | } | |
1586 | ||
f078727b FT |
1587 | static void eh_lock_door_done(struct request *req, int uptodate) |
1588 | { | |
1589 | __blk_put_request(req->q, req); | |
1590 | } | |
1591 | ||
1da177e4 LT |
1592 | /** |
1593 | * scsi_eh_lock_door - Prevent medium removal for the specified device | |
1594 | * @sdev: SCSI device to prevent medium removal | |
1595 | * | |
1596 | * Locking: | |
91bc31fb | 1597 | * We must be called from process context. |
1da177e4 LT |
1598 | * |
1599 | * Notes: | |
1600 | * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the | |
1601 | * head of the devices request queue, and continue. | |
dc8875e1 | 1602 | */ |
1da177e4 LT |
1603 | static void scsi_eh_lock_door(struct scsi_device *sdev) |
1604 | { | |
f078727b | 1605 | struct request *req; |
1da177e4 | 1606 | |
91bc31fb JB |
1607 | /* |
1608 | * blk_get_request with GFP_KERNEL (__GFP_WAIT) sleeps until a | |
1609 | * request becomes available | |
1610 | */ | |
f078727b | 1611 | req = blk_get_request(sdev->request_queue, READ, GFP_KERNEL); |
1da177e4 | 1612 | |
f078727b FT |
1613 | req->cmd[0] = ALLOW_MEDIUM_REMOVAL; |
1614 | req->cmd[1] = 0; | |
1615 | req->cmd[2] = 0; | |
1616 | req->cmd[3] = 0; | |
1617 | req->cmd[4] = SCSI_REMOVAL_PREVENT; | |
1618 | req->cmd[5] = 0; | |
1da177e4 | 1619 | |
f078727b FT |
1620 | req->cmd_len = COMMAND_SIZE(req->cmd[0]); |
1621 | ||
1622 | req->cmd_type = REQ_TYPE_BLOCK_PC; | |
1623 | req->cmd_flags |= REQ_QUIET; | |
1624 | req->timeout = 10 * HZ; | |
1625 | req->retries = 5; | |
1626 | ||
1627 | blk_execute_rq_nowait(req->q, NULL, req, 1, eh_lock_door_done); | |
1628 | } | |
1da177e4 LT |
1629 | |
1630 | /** | |
1631 | * scsi_restart_operations - restart io operations to the specified host. | |
1632 | * @shost: Host we are restarting. | |
1633 | * | |
1634 | * Notes: | |
1635 | * When we entered the error handler, we blocked all further i/o to | |
1636 | * this device. we need to 'reverse' this process. | |
dc8875e1 | 1637 | */ |
1da177e4 LT |
1638 | static void scsi_restart_operations(struct Scsi_Host *shost) |
1639 | { | |
1640 | struct scsi_device *sdev; | |
939647ee | 1641 | unsigned long flags; |
1da177e4 LT |
1642 | |
1643 | /* | |
1644 | * If the door was locked, we need to insert a door lock request | |
1645 | * onto the head of the SCSI request queue for the device. There | |
1646 | * is no point trying to lock the door of an off-line device. | |
1647 | */ | |
1648 | shost_for_each_device(sdev, shost) { | |
1649 | if (scsi_device_online(sdev) && sdev->locked) | |
1650 | scsi_eh_lock_door(sdev); | |
1651 | } | |
1652 | ||
1653 | /* | |
1654 | * next free up anything directly waiting upon the host. this | |
1655 | * will be requests for character device operations, and also for | |
1656 | * ioctls to queued block devices. | |
1657 | */ | |
1658 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: waking up host to restart\n", | |
cadbd4a5 | 1659 | __func__)); |
1da177e4 | 1660 | |
939647ee JB |
1661 | spin_lock_irqsave(shost->host_lock, flags); |
1662 | if (scsi_host_set_state(shost, SHOST_RUNNING)) | |
1663 | if (scsi_host_set_state(shost, SHOST_CANCEL)) | |
1664 | BUG_ON(scsi_host_set_state(shost, SHOST_DEL)); | |
1665 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
1666 | |
1667 | wake_up(&shost->host_wait); | |
1668 | ||
1669 | /* | |
1670 | * finally we need to re-initiate requests that may be pending. we will | |
1671 | * have had everything blocked while error handling is taking place, and | |
1672 | * now that error recovery is done, we will need to ensure that these | |
1673 | * requests are started. | |
1674 | */ | |
1675 | scsi_run_host_queues(shost); | |
1676 | } | |
1677 | ||
1678 | /** | |
1679 | * scsi_eh_ready_devs - check device ready state and recover if not. | |
1680 | * @shost: host to be recovered. | |
eb44820c RL |
1681 | * @work_q: &list_head for pending commands. |
1682 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1683 | */ |
dca84e46 DW |
1684 | void scsi_eh_ready_devs(struct Scsi_Host *shost, |
1685 | struct list_head *work_q, | |
1686 | struct list_head *done_q) | |
1da177e4 LT |
1687 | { |
1688 | if (!scsi_eh_stu(shost, work_q, done_q)) | |
1689 | if (!scsi_eh_bus_device_reset(shost, work_q, done_q)) | |
30bd7df8 MC |
1690 | if (!scsi_eh_target_reset(shost, work_q, done_q)) |
1691 | if (!scsi_eh_bus_reset(shost, work_q, done_q)) | |
1692 | if (!scsi_eh_host_reset(work_q, done_q)) | |
1693 | scsi_eh_offline_sdevs(work_q, | |
1694 | done_q); | |
1da177e4 | 1695 | } |
dca84e46 | 1696 | EXPORT_SYMBOL_GPL(scsi_eh_ready_devs); |
1da177e4 LT |
1697 | |
1698 | /** | |
1699 | * scsi_eh_flush_done_q - finish processed commands or retry them. | |
1700 | * @done_q: list_head of processed commands. | |
dc8875e1 | 1701 | */ |
041c5fc3 | 1702 | void scsi_eh_flush_done_q(struct list_head *done_q) |
1da177e4 | 1703 | { |
937abeaa | 1704 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1705 | |
937abeaa CH |
1706 | list_for_each_entry_safe(scmd, next, done_q, eh_entry) { |
1707 | list_del_init(&scmd->eh_entry); | |
1da177e4 | 1708 | if (scsi_device_online(scmd->device) && |
4a27446f | 1709 | !scsi_noretry_cmd(scmd) && |
8884efab | 1710 | (++scmd->retries <= scmd->allowed)) { |
1da177e4 LT |
1711 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush" |
1712 | " retry cmd: %p\n", | |
1713 | current->comm, | |
1714 | scmd)); | |
1715 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); | |
1716 | } else { | |
793698ce PM |
1717 | /* |
1718 | * If just we got sense for the device (called | |
1719 | * scsi_eh_get_sense), scmd->result is already | |
1720 | * set, do not set DRIVER_TIMEOUT. | |
1721 | */ | |
1da177e4 LT |
1722 | if (!scmd->result) |
1723 | scmd->result |= (DRIVER_TIMEOUT << 24); | |
1724 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush finish" | |
1725 | " cmd: %p\n", | |
1726 | current->comm, scmd)); | |
1727 | scsi_finish_command(scmd); | |
1728 | } | |
1729 | } | |
1730 | } | |
041c5fc3 | 1731 | EXPORT_SYMBOL(scsi_eh_flush_done_q); |
1da177e4 LT |
1732 | |
1733 | /** | |
1734 | * scsi_unjam_host - Attempt to fix a host which has a cmd that failed. | |
1735 | * @shost: Host to unjam. | |
1736 | * | |
1737 | * Notes: | |
1738 | * When we come in here, we *know* that all commands on the bus have | |
1739 | * either completed, failed or timed out. we also know that no further | |
1740 | * commands are being sent to the host, so things are relatively quiet | |
1741 | * and we have freedom to fiddle with things as we wish. | |
1742 | * | |
1743 | * This is only the *default* implementation. it is possible for | |
1744 | * individual drivers to supply their own version of this function, and | |
1745 | * if the maintainer wishes to do this, it is strongly suggested that | |
1746 | * this function be taken as a template and modified. this function | |
1747 | * was designed to correctly handle problems for about 95% of the | |
1748 | * different cases out there, and it should always provide at least a | |
1749 | * reasonable amount of error recovery. | |
1750 | * | |
1751 | * Any command marked 'failed' or 'timeout' must eventually have | |
1752 | * scsi_finish_cmd() called for it. we do all of the retry stuff | |
1753 | * here, so when we restart the host after we return it should have an | |
1754 | * empty queue. | |
dc8875e1 | 1755 | */ |
1da177e4 LT |
1756 | static void scsi_unjam_host(struct Scsi_Host *shost) |
1757 | { | |
1758 | unsigned long flags; | |
1759 | LIST_HEAD(eh_work_q); | |
1760 | LIST_HEAD(eh_done_q); | |
1761 | ||
1762 | spin_lock_irqsave(shost->host_lock, flags); | |
1763 | list_splice_init(&shost->eh_cmd_q, &eh_work_q); | |
1764 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1765 | ||
1766 | SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost, &eh_work_q)); | |
1767 | ||
1768 | if (!scsi_eh_get_sense(&eh_work_q, &eh_done_q)) | |
1769 | if (!scsi_eh_abort_cmds(&eh_work_q, &eh_done_q)) | |
1770 | scsi_eh_ready_devs(shost, &eh_work_q, &eh_done_q); | |
1771 | ||
1772 | scsi_eh_flush_done_q(&eh_done_q); | |
1773 | } | |
1774 | ||
1775 | /** | |
ad42eb1b | 1776 | * scsi_error_handler - SCSI error handler thread |
1da177e4 LT |
1777 | * @data: Host for which we are running. |
1778 | * | |
1779 | * Notes: | |
ad42eb1b CH |
1780 | * This is the main error handling loop. This is run as a kernel thread |
1781 | * for every SCSI host and handles all error handling activity. | |
dc8875e1 | 1782 | */ |
1da177e4 LT |
1783 | int scsi_error_handler(void *data) |
1784 | { | |
ad42eb1b | 1785 | struct Scsi_Host *shost = data; |
1da177e4 | 1786 | |
1da177e4 | 1787 | /* |
ad42eb1b CH |
1788 | * We use TASK_INTERRUPTIBLE so that the thread is not |
1789 | * counted against the load average as a running process. | |
1790 | * We never actually get interrupted because kthread_run | |
c03264a7 | 1791 | * disables signal delivery for the created thread. |
1da177e4 | 1792 | */ |
3ed7a470 JB |
1793 | set_current_state(TASK_INTERRUPTIBLE); |
1794 | while (!kthread_should_stop()) { | |
ee7863bc | 1795 | if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) || |
3ed7a470 | 1796 | shost->host_failed != shost->host_busy) { |
ad42eb1b CH |
1797 | SCSI_LOG_ERROR_RECOVERY(1, |
1798 | printk("Error handler scsi_eh_%d sleeping\n", | |
1799 | shost->host_no)); | |
3ed7a470 JB |
1800 | schedule(); |
1801 | set_current_state(TASK_INTERRUPTIBLE); | |
1802 | continue; | |
1803 | } | |
1da177e4 | 1804 | |
3ed7a470 | 1805 | __set_current_state(TASK_RUNNING); |
ad42eb1b CH |
1806 | SCSI_LOG_ERROR_RECOVERY(1, |
1807 | printk("Error handler scsi_eh_%d waking up\n", | |
1808 | shost->host_no)); | |
1da177e4 | 1809 | |
1da177e4 LT |
1810 | /* |
1811 | * We have a host that is failing for some reason. Figure out | |
1812 | * what we need to do to get it up and online again (if we can). | |
1813 | * If we fail, we end up taking the thing offline. | |
1814 | */ | |
ae0751ff | 1815 | if (!shost->eh_noresume && scsi_autopm_get_host(shost) != 0) { |
bc4f2401 AS |
1816 | SCSI_LOG_ERROR_RECOVERY(1, |
1817 | printk(KERN_ERR "Error handler scsi_eh_%d " | |
1818 | "unable to autoresume\n", | |
1819 | shost->host_no)); | |
1820 | continue; | |
1821 | } | |
1822 | ||
9227c33d CH |
1823 | if (shost->transportt->eh_strategy_handler) |
1824 | shost->transportt->eh_strategy_handler(shost); | |
1da177e4 LT |
1825 | else |
1826 | scsi_unjam_host(shost); | |
1827 | ||
1da177e4 LT |
1828 | /* |
1829 | * Note - if the above fails completely, the action is to take | |
1830 | * individual devices offline and flush the queue of any | |
1831 | * outstanding requests that may have been pending. When we | |
1832 | * restart, we restart any I/O to any other devices on the bus | |
1833 | * which are still online. | |
1834 | */ | |
1835 | scsi_restart_operations(shost); | |
ae0751ff LM |
1836 | if (!shost->eh_noresume) |
1837 | scsi_autopm_put_host(shost); | |
3ed7a470 | 1838 | set_current_state(TASK_INTERRUPTIBLE); |
1da177e4 | 1839 | } |
461a0ffb SR |
1840 | __set_current_state(TASK_RUNNING); |
1841 | ||
ad42eb1b CH |
1842 | SCSI_LOG_ERROR_RECOVERY(1, |
1843 | printk("Error handler scsi_eh_%d exiting\n", shost->host_no)); | |
3ed7a470 | 1844 | shost->ehandler = NULL; |
1da177e4 LT |
1845 | return 0; |
1846 | } | |
1847 | ||
1848 | /* | |
1849 | * Function: scsi_report_bus_reset() | |
1850 | * | |
1851 | * Purpose: Utility function used by low-level drivers to report that | |
1852 | * they have observed a bus reset on the bus being handled. | |
1853 | * | |
1854 | * Arguments: shost - Host in question | |
1855 | * channel - channel 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_bus_reset(struct Scsi_Host *shost, int channel) | |
1870 | { | |
1871 | struct scsi_device *sdev; | |
1872 | ||
1873 | __shost_for_each_device(sdev, shost) { | |
30bd7df8 MC |
1874 | if (channel == sdev_channel(sdev)) |
1875 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
1876 | } |
1877 | } | |
1878 | EXPORT_SYMBOL(scsi_report_bus_reset); | |
1879 | ||
1880 | /* | |
1881 | * Function: scsi_report_device_reset() | |
1882 | * | |
1883 | * Purpose: Utility function used by low-level drivers to report that | |
1884 | * they have observed a device reset on the device being handled. | |
1885 | * | |
1886 | * Arguments: shost - Host in question | |
1887 | * channel - channel on which reset was observed | |
1888 | * target - target on which reset was observed | |
1889 | * | |
1890 | * Returns: Nothing | |
1891 | * | |
1892 | * Lock status: Host lock must be held | |
1893 | * | |
1894 | * Notes: This only needs to be called if the reset is one which | |
1895 | * originates from an unknown location. Resets originated | |
1896 | * by the mid-level itself don't need to call this, but there | |
1897 | * should be no harm. | |
1898 | * | |
1899 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
1900 | * is properly treated. | |
1901 | */ | |
1902 | void scsi_report_device_reset(struct Scsi_Host *shost, int channel, int target) | |
1903 | { | |
1904 | struct scsi_device *sdev; | |
1905 | ||
1906 | __shost_for_each_device(sdev, shost) { | |
422c0d61 | 1907 | if (channel == sdev_channel(sdev) && |
30bd7df8 MC |
1908 | target == sdev_id(sdev)) |
1909 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
1910 | } |
1911 | } | |
1912 | EXPORT_SYMBOL(scsi_report_device_reset); | |
1913 | ||
1914 | static void | |
1915 | scsi_reset_provider_done_command(struct scsi_cmnd *scmd) | |
1916 | { | |
1917 | } | |
1918 | ||
1919 | /* | |
1920 | * Function: scsi_reset_provider | |
1921 | * | |
1922 | * Purpose: Send requested reset to a bus or device at any phase. | |
1923 | * | |
1924 | * Arguments: device - device to send reset to | |
1925 | * flag - reset type (see scsi.h) | |
1926 | * | |
1927 | * Returns: SUCCESS/FAILURE. | |
1928 | * | |
1929 | * Notes: This is used by the SCSI Generic driver to provide | |
1930 | * Bus/Device reset capability. | |
1931 | */ | |
1932 | int | |
1933 | scsi_reset_provider(struct scsi_device *dev, int flag) | |
1934 | { | |
bc4f2401 | 1935 | struct scsi_cmnd *scmd; |
d7a1bb0a | 1936 | struct Scsi_Host *shost = dev->host; |
1da177e4 | 1937 | struct request req; |
d7a1bb0a | 1938 | unsigned long flags; |
1da177e4 LT |
1939 | int rtn; |
1940 | ||
bc4f2401 AS |
1941 | if (scsi_autopm_get_host(shost) < 0) |
1942 | return FAILED; | |
1943 | ||
1944 | scmd = scsi_get_command(dev, GFP_KERNEL); | |
4f54eec8 | 1945 | blk_rq_init(NULL, &req); |
1da177e4 | 1946 | scmd->request = &req; |
b4edcbca | 1947 | |
64a87b24 BH |
1948 | scmd->cmnd = req.cmd; |
1949 | ||
1da177e4 | 1950 | scmd->scsi_done = scsi_reset_provider_done_command; |
30b0c37b | 1951 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
1da177e4 LT |
1952 | |
1953 | scmd->cmd_len = 0; | |
1954 | ||
1955 | scmd->sc_data_direction = DMA_BIDIRECTIONAL; | |
1da177e4 | 1956 | |
d7a1bb0a JS |
1957 | spin_lock_irqsave(shost->host_lock, flags); |
1958 | shost->tmf_in_progress = 1; | |
1959 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1960 | ||
1da177e4 LT |
1961 | switch (flag) { |
1962 | case SCSI_TRY_RESET_DEVICE: | |
1963 | rtn = scsi_try_bus_device_reset(scmd); | |
1964 | if (rtn == SUCCESS) | |
1965 | break; | |
1966 | /* FALLTHROUGH */ | |
30bd7df8 MC |
1967 | case SCSI_TRY_RESET_TARGET: |
1968 | rtn = scsi_try_target_reset(scmd); | |
1969 | if (rtn == SUCCESS) | |
1970 | break; | |
1971 | /* FALLTHROUGH */ | |
1da177e4 LT |
1972 | case SCSI_TRY_RESET_BUS: |
1973 | rtn = scsi_try_bus_reset(scmd); | |
1974 | if (rtn == SUCCESS) | |
1975 | break; | |
1976 | /* FALLTHROUGH */ | |
1977 | case SCSI_TRY_RESET_HOST: | |
1978 | rtn = scsi_try_host_reset(scmd); | |
1979 | break; | |
1980 | default: | |
1981 | rtn = FAILED; | |
1982 | } | |
1983 | ||
d7a1bb0a JS |
1984 | spin_lock_irqsave(shost->host_lock, flags); |
1985 | shost->tmf_in_progress = 0; | |
1986 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1987 | ||
1988 | /* | |
1989 | * be sure to wake up anyone who was sleeping or had their queue | |
1990 | * suspended while we performed the TMF. | |
1991 | */ | |
1992 | SCSI_LOG_ERROR_RECOVERY(3, | |
1993 | printk("%s: waking up host to restart after TMF\n", | |
cadbd4a5 | 1994 | __func__)); |
d7a1bb0a JS |
1995 | |
1996 | wake_up(&shost->host_wait); | |
1997 | ||
1998 | scsi_run_host_queues(shost); | |
1999 | ||
1da177e4 | 2000 | scsi_next_command(scmd); |
bc4f2401 | 2001 | scsi_autopm_put_host(shost); |
1da177e4 LT |
2002 | return rtn; |
2003 | } | |
2004 | EXPORT_SYMBOL(scsi_reset_provider); | |
2005 | ||
2006 | /** | |
2007 | * scsi_normalize_sense - normalize main elements from either fixed or | |
2008 | * descriptor sense data format into a common format. | |
2009 | * | |
2010 | * @sense_buffer: byte array containing sense data returned by device | |
2011 | * @sb_len: number of valid bytes in sense_buffer | |
2012 | * @sshdr: pointer to instance of structure that common | |
2013 | * elements are written to. | |
2014 | * | |
2015 | * Notes: | |
2016 | * The "main elements" from sense data are: response_code, sense_key, | |
2017 | * asc, ascq and additional_length (only for descriptor format). | |
2018 | * | |
2019 | * Typically this function can be called after a device has | |
2020 | * responded to a SCSI command with the CHECK_CONDITION status. | |
2021 | * | |
2022 | * Return value: | |
2023 | * 1 if valid sense data information found, else 0; | |
dc8875e1 | 2024 | */ |
1da177e4 LT |
2025 | int scsi_normalize_sense(const u8 *sense_buffer, int sb_len, |
2026 | struct scsi_sense_hdr *sshdr) | |
2027 | { | |
33aa687d | 2028 | if (!sense_buffer || !sb_len) |
1da177e4 LT |
2029 | return 0; |
2030 | ||
2031 | memset(sshdr, 0, sizeof(struct scsi_sense_hdr)); | |
2032 | ||
2033 | sshdr->response_code = (sense_buffer[0] & 0x7f); | |
33aa687d JB |
2034 | |
2035 | if (!scsi_sense_valid(sshdr)) | |
2036 | return 0; | |
2037 | ||
1da177e4 LT |
2038 | if (sshdr->response_code >= 0x72) { |
2039 | /* | |
2040 | * descriptor format | |
2041 | */ | |
2042 | if (sb_len > 1) | |
2043 | sshdr->sense_key = (sense_buffer[1] & 0xf); | |
2044 | if (sb_len > 2) | |
2045 | sshdr->asc = sense_buffer[2]; | |
2046 | if (sb_len > 3) | |
2047 | sshdr->ascq = sense_buffer[3]; | |
2048 | if (sb_len > 7) | |
2049 | sshdr->additional_length = sense_buffer[7]; | |
2050 | } else { | |
0bf8c869 | 2051 | /* |
1da177e4 LT |
2052 | * fixed format |
2053 | */ | |
2054 | if (sb_len > 2) | |
2055 | sshdr->sense_key = (sense_buffer[2] & 0xf); | |
2056 | if (sb_len > 7) { | |
2057 | sb_len = (sb_len < (sense_buffer[7] + 8)) ? | |
2058 | sb_len : (sense_buffer[7] + 8); | |
2059 | if (sb_len > 12) | |
2060 | sshdr->asc = sense_buffer[12]; | |
2061 | if (sb_len > 13) | |
2062 | sshdr->ascq = sense_buffer[13]; | |
2063 | } | |
2064 | } | |
2065 | ||
2066 | return 1; | |
2067 | } | |
2068 | EXPORT_SYMBOL(scsi_normalize_sense); | |
2069 | ||
1da177e4 LT |
2070 | int scsi_command_normalize_sense(struct scsi_cmnd *cmd, |
2071 | struct scsi_sense_hdr *sshdr) | |
2072 | { | |
2073 | return scsi_normalize_sense(cmd->sense_buffer, | |
b80ca4f7 | 2074 | SCSI_SENSE_BUFFERSIZE, sshdr); |
1da177e4 LT |
2075 | } |
2076 | EXPORT_SYMBOL(scsi_command_normalize_sense); | |
2077 | ||
2078 | /** | |
eb44820c | 2079 | * scsi_sense_desc_find - search for a given descriptor type in descriptor sense data format. |
1da177e4 LT |
2080 | * @sense_buffer: byte array of descriptor format sense data |
2081 | * @sb_len: number of valid bytes in sense_buffer | |
2082 | * @desc_type: value of descriptor type to find | |
2083 | * (e.g. 0 -> information) | |
2084 | * | |
2085 | * Notes: | |
2086 | * only valid when sense data is in descriptor format | |
2087 | * | |
2088 | * Return value: | |
2089 | * pointer to start of (first) descriptor if found else NULL | |
dc8875e1 | 2090 | */ |
1da177e4 LT |
2091 | const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len, |
2092 | int desc_type) | |
2093 | { | |
2094 | int add_sen_len, add_len, desc_len, k; | |
2095 | const u8 * descp; | |
2096 | ||
2097 | if ((sb_len < 8) || (0 == (add_sen_len = sense_buffer[7]))) | |
2098 | return NULL; | |
2099 | if ((sense_buffer[0] < 0x72) || (sense_buffer[0] > 0x73)) | |
2100 | return NULL; | |
2101 | add_sen_len = (add_sen_len < (sb_len - 8)) ? | |
2102 | add_sen_len : (sb_len - 8); | |
2103 | descp = &sense_buffer[8]; | |
2104 | for (desc_len = 0, k = 0; k < add_sen_len; k += desc_len) { | |
2105 | descp += desc_len; | |
2106 | add_len = (k < (add_sen_len - 1)) ? descp[1]: -1; | |
2107 | desc_len = add_len + 2; | |
2108 | if (descp[0] == desc_type) | |
2109 | return descp; | |
2110 | if (add_len < 0) // short descriptor ?? | |
2111 | break; | |
2112 | } | |
2113 | return NULL; | |
2114 | } | |
2115 | EXPORT_SYMBOL(scsi_sense_desc_find); | |
2116 | ||
2117 | /** | |
eb44820c | 2118 | * scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor format) |
1da177e4 LT |
2119 | * @sense_buffer: byte array of sense data |
2120 | * @sb_len: number of valid bytes in sense_buffer | |
2121 | * @info_out: pointer to 64 integer where 8 or 4 byte information | |
2122 | * field will be placed if found. | |
2123 | * | |
2124 | * Return value: | |
2125 | * 1 if information field found, 0 if not found. | |
dc8875e1 | 2126 | */ |
1da177e4 LT |
2127 | int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len, |
2128 | u64 * info_out) | |
2129 | { | |
2130 | int j; | |
2131 | const u8 * ucp; | |
2132 | u64 ull; | |
2133 | ||
2134 | if (sb_len < 7) | |
2135 | return 0; | |
2136 | switch (sense_buffer[0] & 0x7f) { | |
2137 | case 0x70: | |
2138 | case 0x71: | |
2139 | if (sense_buffer[0] & 0x80) { | |
2140 | *info_out = (sense_buffer[3] << 24) + | |
2141 | (sense_buffer[4] << 16) + | |
2142 | (sense_buffer[5] << 8) + sense_buffer[6]; | |
2143 | return 1; | |
2144 | } else | |
2145 | return 0; | |
2146 | case 0x72: | |
2147 | case 0x73: | |
2148 | ucp = scsi_sense_desc_find(sense_buffer, sb_len, | |
2149 | 0 /* info desc */); | |
2150 | if (ucp && (0xa == ucp[1])) { | |
2151 | ull = 0; | |
2152 | for (j = 0; j < 8; ++j) { | |
2153 | if (j > 0) | |
2154 | ull <<= 8; | |
2155 | ull |= ucp[4 + j]; | |
2156 | } | |
2157 | *info_out = ull; | |
2158 | return 1; | |
2159 | } else | |
2160 | return 0; | |
2161 | default: | |
2162 | return 0; | |
2163 | } | |
2164 | } | |
2165 | EXPORT_SYMBOL(scsi_get_sense_info_fld); | |
3bc6a261 FT |
2166 | |
2167 | /** | |
2168 | * scsi_build_sense_buffer - build sense data in a buffer | |
2169 | * @desc: Sense format (non zero == descriptor format, | |
2170 | * 0 == fixed format) | |
2171 | * @buf: Where to build sense data | |
2172 | * @key: Sense key | |
2173 | * @asc: Additional sense code | |
2174 | * @ascq: Additional sense code qualifier | |
2175 | * | |
2176 | **/ | |
2177 | void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq) | |
2178 | { | |
2179 | if (desc) { | |
2180 | buf[0] = 0x72; /* descriptor, current */ | |
2181 | buf[1] = key; | |
2182 | buf[2] = asc; | |
2183 | buf[3] = ascq; | |
2184 | buf[7] = 0; | |
2185 | } else { | |
2186 | buf[0] = 0x70; /* fixed, current */ | |
2187 | buf[2] = key; | |
2188 | buf[7] = 0xa; | |
2189 | buf[12] = asc; | |
2190 | buf[13] = ascq; | |
2191 | } | |
2192 | } | |
2193 | EXPORT_SYMBOL(scsi_build_sense_buffer); |