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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 | ||
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; |
0bf8c869 | 132 | struct Scsi_Host *host = scmd->device->host; |
6c5f8ce1 | 133 | |
bf816235 | 134 | trace_scsi_dispatch_cmd_timeout(scmd); |
1da177e4 LT |
135 | scsi_log_completion(scmd, TIMEOUT_ERROR); |
136 | ||
0bf8c869 JJ |
137 | if (host->transportt->eh_timed_out) |
138 | rtn = host->transportt->eh_timed_out(scmd); | |
139 | else if (host->hostt->eh_timed_out) | |
140 | rtn = host->hostt->eh_timed_out(scmd); | |
1da177e4 | 141 | |
fa990781 CH |
142 | if (unlikely(rtn == BLK_EH_NOT_HANDLED && |
143 | !scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD))) { | |
939647ee | 144 | scmd->result |= DID_TIME_OUT << 16; |
fa990781 | 145 | rtn = BLK_EH_HANDLED; |
1da177e4 | 146 | } |
242f9dcb | 147 | |
fa990781 | 148 | return rtn; |
1da177e4 LT |
149 | } |
150 | ||
151 | /** | |
152 | * scsi_block_when_processing_errors - Prevent cmds from being queued. | |
153 | * @sdev: Device on which we are performing recovery. | |
154 | * | |
155 | * Description: | |
156 | * We block until the host is out of error recovery, and then check to | |
157 | * see whether the host or the device is offline. | |
158 | * | |
159 | * Return value: | |
160 | * 0 when dev was taken offline by error recovery. 1 OK to proceed. | |
dc8875e1 | 161 | */ |
1da177e4 LT |
162 | int scsi_block_when_processing_errors(struct scsi_device *sdev) |
163 | { | |
164 | int online; | |
165 | ||
939647ee | 166 | wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host)); |
1da177e4 LT |
167 | |
168 | online = scsi_device_online(sdev); | |
169 | ||
cadbd4a5 | 170 | SCSI_LOG_ERROR_RECOVERY(5, printk("%s: rtn: %d\n", __func__, |
1da177e4 LT |
171 | online)); |
172 | ||
173 | return online; | |
174 | } | |
175 | EXPORT_SYMBOL(scsi_block_when_processing_errors); | |
176 | ||
177 | #ifdef CONFIG_SCSI_LOGGING | |
178 | /** | |
179 | * scsi_eh_prt_fail_stats - Log info on failures. | |
180 | * @shost: scsi host being recovered. | |
181 | * @work_q: Queue of scsi cmds to process. | |
dc8875e1 | 182 | */ |
1da177e4 LT |
183 | static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost, |
184 | struct list_head *work_q) | |
185 | { | |
186 | struct scsi_cmnd *scmd; | |
187 | struct scsi_device *sdev; | |
188 | int total_failures = 0; | |
189 | int cmd_failed = 0; | |
190 | int cmd_cancel = 0; | |
191 | int devices_failed = 0; | |
192 | ||
193 | shost_for_each_device(sdev, shost) { | |
194 | list_for_each_entry(scmd, work_q, eh_entry) { | |
195 | if (scmd->device == sdev) { | |
196 | ++total_failures; | |
3111b0d1 | 197 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) |
1da177e4 | 198 | ++cmd_cancel; |
0bf8c869 | 199 | else |
1da177e4 LT |
200 | ++cmd_failed; |
201 | } | |
202 | } | |
203 | ||
204 | if (cmd_cancel || cmd_failed) { | |
205 | SCSI_LOG_ERROR_RECOVERY(3, | |
9ccfc756 JB |
206 | sdev_printk(KERN_INFO, sdev, |
207 | "%s: cmds failed: %d, cancel: %d\n", | |
cadbd4a5 | 208 | __func__, cmd_failed, |
9ccfc756 | 209 | cmd_cancel)); |
1da177e4 LT |
210 | cmd_cancel = 0; |
211 | cmd_failed = 0; | |
212 | ++devices_failed; | |
213 | } | |
214 | } | |
215 | ||
216 | SCSI_LOG_ERROR_RECOVERY(2, printk("Total of %d commands on %d" | |
217 | " devices require eh work\n", | |
0bf8c869 | 218 | total_failures, devices_failed)); |
1da177e4 LT |
219 | } |
220 | #endif | |
221 | ||
222 | /** | |
223 | * scsi_check_sense - Examine scsi cmd sense | |
224 | * @scmd: Cmd to have sense checked. | |
225 | * | |
226 | * Return value: | |
63583cca | 227 | * SUCCESS or FAILED or NEEDS_RETRY or TARGET_ERROR |
1da177e4 LT |
228 | * |
229 | * Notes: | |
230 | * When a deferred error is detected the current command has | |
231 | * not been executed and needs retrying. | |
dc8875e1 | 232 | */ |
1da177e4 LT |
233 | static int scsi_check_sense(struct scsi_cmnd *scmd) |
234 | { | |
a6a8d9f8 | 235 | struct scsi_device *sdev = scmd->device; |
1da177e4 LT |
236 | struct scsi_sense_hdr sshdr; |
237 | ||
238 | if (! scsi_command_normalize_sense(scmd, &sshdr)) | |
239 | return FAILED; /* no valid sense data */ | |
240 | ||
241 | if (scsi_sense_is_deferred(&sshdr)) | |
242 | return NEEDS_RETRY; | |
243 | ||
a6a8d9f8 CS |
244 | if (sdev->scsi_dh_data && sdev->scsi_dh_data->scsi_dh && |
245 | sdev->scsi_dh_data->scsi_dh->check_sense) { | |
246 | int rc; | |
247 | ||
248 | rc = sdev->scsi_dh_data->scsi_dh->check_sense(sdev, &sshdr); | |
249 | if (rc != SCSI_RETURN_NOT_HANDLED) | |
250 | return rc; | |
251 | /* handler does not care. Drop down to default handling */ | |
252 | } | |
253 | ||
1da177e4 LT |
254 | /* |
255 | * Previous logic looked for FILEMARK, EOM or ILI which are | |
256 | * mainly associated with tapes and returned SUCCESS. | |
257 | */ | |
258 | if (sshdr.response_code == 0x70) { | |
259 | /* fixed format */ | |
260 | if (scmd->sense_buffer[2] & 0xe0) | |
261 | return SUCCESS; | |
262 | } else { | |
263 | /* | |
264 | * descriptor format: look for "stream commands sense data | |
265 | * descriptor" (see SSC-3). Assume single sense data | |
266 | * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG. | |
267 | */ | |
268 | if ((sshdr.additional_length > 3) && | |
269 | (scmd->sense_buffer[8] == 0x4) && | |
270 | (scmd->sense_buffer[11] & 0xe0)) | |
271 | return SUCCESS; | |
272 | } | |
273 | ||
274 | switch (sshdr.sense_key) { | |
275 | case NO_SENSE: | |
276 | return SUCCESS; | |
277 | case RECOVERED_ERROR: | |
278 | return /* soft_error */ SUCCESS; | |
279 | ||
280 | case ABORTED_COMMAND: | |
511e44f4 MP |
281 | if (sshdr.asc == 0x10) /* DIF */ |
282 | return SUCCESS; | |
283 | ||
1da177e4 LT |
284 | return NEEDS_RETRY; |
285 | case NOT_READY: | |
286 | case UNIT_ATTENTION: | |
287 | /* | |
288 | * if we are expecting a cc/ua because of a bus reset that we | |
289 | * performed, treat this just as a retry. otherwise this is | |
290 | * information that we should pass up to the upper-level driver | |
291 | * so that we can deal with it there. | |
292 | */ | |
293 | if (scmd->device->expecting_cc_ua) { | |
294 | scmd->device->expecting_cc_ua = 0; | |
295 | return NEEDS_RETRY; | |
296 | } | |
297 | /* | |
0bf8c869 | 298 | * if the device is in the process of becoming ready, we |
1da177e4 LT |
299 | * should retry. |
300 | */ | |
301 | if ((sshdr.asc == 0x04) && (sshdr.ascq == 0x01)) | |
302 | return NEEDS_RETRY; | |
303 | /* | |
304 | * if the device is not started, we need to wake | |
305 | * the error handler to start the motor | |
306 | */ | |
307 | if (scmd->device->allow_restart && | |
308 | (sshdr.asc == 0x04) && (sshdr.ascq == 0x02)) | |
309 | return FAILED; | |
77a42297 | 310 | |
6e49949c MC |
311 | if (sshdr.asc == 0x3f && sshdr.ascq == 0x0e) |
312 | scmd_printk(KERN_WARNING, scmd, | |
313 | "Warning! Received an indication that the " | |
314 | "LUN assignments on this target have " | |
315 | "changed. The Linux SCSI layer does not " | |
316 | "automatically remap LUN assignments.\n"); | |
317 | else if (sshdr.asc == 0x3f) | |
318 | scmd_printk(KERN_WARNING, scmd, | |
319 | "Warning! Received an indication that the " | |
320 | "operating parameters on this target have " | |
321 | "changed. The Linux SCSI layer does not " | |
322 | "automatically adjust these parameters.\n"); | |
323 | ||
deb1cb63 SI |
324 | if (sshdr.asc == 0x38 && sshdr.ascq == 0x07) |
325 | scmd_printk(KERN_WARNING, scmd, | |
326 | "Warning! Received an indication that the " | |
327 | "LUN reached a thin provisioning soft " | |
328 | "threshold.\n"); | |
329 | ||
02e031cb CH |
330 | /* |
331 | * Pass the UA upwards for a determination in the completion | |
332 | * functions. | |
333 | */ | |
334 | return SUCCESS; | |
1da177e4 | 335 | |
63583cca | 336 | /* these are not supported */ |
1da177e4 LT |
337 | case COPY_ABORTED: |
338 | case VOLUME_OVERFLOW: | |
339 | case MISCOMPARE: | |
63583cca HR |
340 | case BLANK_CHECK: |
341 | case DATA_PROTECT: | |
342 | return TARGET_ERROR; | |
1da177e4 LT |
343 | |
344 | case MEDIUM_ERROR: | |
fd1b494d LT |
345 | if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */ |
346 | sshdr.asc == 0x13 || /* AMNF DATA FIELD */ | |
347 | sshdr.asc == 0x14) { /* RECORD NOT FOUND */ | |
63583cca | 348 | return TARGET_ERROR; |
fd1b494d | 349 | } |
1da177e4 LT |
350 | return NEEDS_RETRY; |
351 | ||
352 | case HARDWARE_ERROR: | |
353 | if (scmd->device->retry_hwerror) | |
bb0003c1 | 354 | return ADD_TO_MLQUEUE; |
1da177e4 | 355 | else |
63583cca | 356 | return TARGET_ERROR; |
1da177e4 LT |
357 | |
358 | case ILLEGAL_REQUEST: | |
1da177e4 LT |
359 | default: |
360 | return SUCCESS; | |
361 | } | |
362 | } | |
363 | ||
4a84067d VD |
364 | static void scsi_handle_queue_ramp_up(struct scsi_device *sdev) |
365 | { | |
366 | struct scsi_host_template *sht = sdev->host->hostt; | |
367 | struct scsi_device *tmp_sdev; | |
368 | ||
369 | if (!sht->change_queue_depth || | |
370 | sdev->queue_depth >= sdev->max_queue_depth) | |
371 | return; | |
372 | ||
373 | if (time_before(jiffies, | |
374 | sdev->last_queue_ramp_up + sdev->queue_ramp_up_period)) | |
375 | return; | |
376 | ||
377 | if (time_before(jiffies, | |
378 | sdev->last_queue_full_time + sdev->queue_ramp_up_period)) | |
379 | return; | |
380 | ||
381 | /* | |
382 | * Walk all devices of a target and do | |
383 | * ramp up on them. | |
384 | */ | |
385 | shost_for_each_device(tmp_sdev, sdev->host) { | |
386 | if (tmp_sdev->channel != sdev->channel || | |
387 | tmp_sdev->id != sdev->id || | |
388 | tmp_sdev->queue_depth == sdev->max_queue_depth) | |
389 | continue; | |
390 | /* | |
391 | * call back into LLD to increase queue_depth by one | |
392 | * with ramp up reason code. | |
393 | */ | |
394 | sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1, | |
395 | SCSI_QDEPTH_RAMP_UP); | |
396 | sdev->last_queue_ramp_up = jiffies; | |
397 | } | |
398 | } | |
399 | ||
42a6a918 MC |
400 | static void scsi_handle_queue_full(struct scsi_device *sdev) |
401 | { | |
402 | struct scsi_host_template *sht = sdev->host->hostt; | |
403 | struct scsi_device *tmp_sdev; | |
404 | ||
405 | if (!sht->change_queue_depth) | |
406 | return; | |
407 | ||
408 | shost_for_each_device(tmp_sdev, sdev->host) { | |
409 | if (tmp_sdev->channel != sdev->channel || | |
410 | tmp_sdev->id != sdev->id) | |
411 | continue; | |
412 | /* | |
413 | * We do not know the number of commands that were at | |
414 | * the device when we got the queue full so we start | |
415 | * from the highest possible value and work our way down. | |
416 | */ | |
417 | sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth - 1, | |
418 | SCSI_QDEPTH_QFULL); | |
419 | } | |
420 | } | |
421 | ||
1da177e4 LT |
422 | /** |
423 | * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD. | |
424 | * @scmd: SCSI cmd to examine. | |
425 | * | |
426 | * Notes: | |
427 | * This is *only* called when we are examining the status of commands | |
428 | * queued during error recovery. the main difference here is that we | |
429 | * don't allow for the possibility of retries here, and we are a lot | |
430 | * more restrictive about what we consider acceptable. | |
dc8875e1 | 431 | */ |
1da177e4 LT |
432 | static int scsi_eh_completed_normally(struct scsi_cmnd *scmd) |
433 | { | |
434 | /* | |
435 | * first check the host byte, to see if there is anything in there | |
436 | * that would indicate what we need to do. | |
437 | */ | |
438 | if (host_byte(scmd->result) == DID_RESET) { | |
439 | /* | |
440 | * rats. we are already in the error handler, so we now | |
441 | * get to try and figure out what to do next. if the sense | |
442 | * is valid, we have a pretty good idea of what to do. | |
443 | * if not, we mark it as FAILED. | |
444 | */ | |
445 | return scsi_check_sense(scmd); | |
446 | } | |
447 | if (host_byte(scmd->result) != DID_OK) | |
448 | return FAILED; | |
449 | ||
450 | /* | |
451 | * next, check the message byte. | |
452 | */ | |
453 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
454 | return FAILED; | |
455 | ||
456 | /* | |
457 | * now, check the status byte to see if this indicates | |
458 | * anything special. | |
459 | */ | |
460 | switch (status_byte(scmd->result)) { | |
461 | case GOOD: | |
4a84067d | 462 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 LT |
463 | case COMMAND_TERMINATED: |
464 | return SUCCESS; | |
465 | case CHECK_CONDITION: | |
466 | return scsi_check_sense(scmd); | |
467 | case CONDITION_GOOD: | |
468 | case INTERMEDIATE_GOOD: | |
469 | case INTERMEDIATE_C_GOOD: | |
470 | /* | |
471 | * who knows? FIXME(eric) | |
472 | */ | |
473 | return SUCCESS; | |
5f91bb05 | 474 | case RESERVATION_CONFLICT: |
67110dfd JB |
475 | if (scmd->cmnd[0] == TEST_UNIT_READY) |
476 | /* it is a success, we probed the device and | |
477 | * found it */ | |
478 | return SUCCESS; | |
479 | /* otherwise, we failed to send the command */ | |
480 | return FAILED; | |
1da177e4 | 481 | case QUEUE_FULL: |
42a6a918 MC |
482 | scsi_handle_queue_full(scmd->device); |
483 | /* fall through */ | |
484 | case BUSY: | |
3eb3a928 | 485 | return NEEDS_RETRY; |
1da177e4 LT |
486 | default: |
487 | return FAILED; | |
488 | } | |
489 | return FAILED; | |
490 | } | |
491 | ||
1da177e4 LT |
492 | /** |
493 | * scsi_eh_done - Completion function for error handling. | |
494 | * @scmd: Cmd that is done. | |
dc8875e1 | 495 | */ |
1da177e4 LT |
496 | static void scsi_eh_done(struct scsi_cmnd *scmd) |
497 | { | |
0bf8c869 | 498 | struct completion *eh_action; |
85631672 | 499 | |
7dfdc9a5 CH |
500 | SCSI_LOG_ERROR_RECOVERY(3, |
501 | printk("%s scmd: %p result: %x\n", | |
cadbd4a5 | 502 | __func__, scmd, scmd->result)); |
85631672 MR |
503 | |
504 | eh_action = scmd->device->host->eh_action; | |
505 | if (eh_action) | |
506 | complete(eh_action); | |
1da177e4 LT |
507 | } |
508 | ||
292148f8 BK |
509 | /** |
510 | * scsi_try_host_reset - ask host adapter to reset itself | |
511 | * @scmd: SCSI cmd to send hsot reset. | |
dc8875e1 | 512 | */ |
292148f8 BK |
513 | static int scsi_try_host_reset(struct scsi_cmnd *scmd) |
514 | { | |
515 | unsigned long flags; | |
516 | int rtn; | |
0bf8c869 JJ |
517 | struct Scsi_Host *host = scmd->device->host; |
518 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 BK |
519 | |
520 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Host RST\n", | |
cadbd4a5 | 521 | __func__)); |
292148f8 | 522 | |
0bf8c869 | 523 | if (!hostt->eh_host_reset_handler) |
292148f8 BK |
524 | return FAILED; |
525 | ||
0bf8c869 | 526 | rtn = hostt->eh_host_reset_handler(scmd); |
292148f8 BK |
527 | |
528 | if (rtn == SUCCESS) { | |
0bf8c869 | 529 | if (!hostt->skip_settle_delay) |
292148f8 | 530 | ssleep(HOST_RESET_SETTLE_TIME); |
0bf8c869 JJ |
531 | spin_lock_irqsave(host->host_lock, flags); |
532 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
533 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
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; | |
0bf8c869 JJ |
547 | struct Scsi_Host *host = scmd->device->host; |
548 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 BK |
549 | |
550 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Bus RST\n", | |
cadbd4a5 | 551 | __func__)); |
292148f8 | 552 | |
0bf8c869 | 553 | if (!hostt->eh_bus_reset_handler) |
292148f8 BK |
554 | return FAILED; |
555 | ||
0bf8c869 | 556 | rtn = hostt->eh_bus_reset_handler(scmd); |
292148f8 BK |
557 | |
558 | if (rtn == SUCCESS) { | |
0bf8c869 | 559 | if (!hostt->skip_settle_delay) |
292148f8 | 560 | ssleep(BUS_RESET_SETTLE_TIME); |
0bf8c869 JJ |
561 | spin_lock_irqsave(host->host_lock, flags); |
562 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
563 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
564 | } |
565 | ||
566 | return rtn; | |
567 | } | |
568 | ||
30bd7df8 MC |
569 | static void __scsi_report_device_reset(struct scsi_device *sdev, void *data) |
570 | { | |
571 | sdev->was_reset = 1; | |
572 | sdev->expecting_cc_ua = 1; | |
573 | } | |
574 | ||
575 | /** | |
576 | * scsi_try_target_reset - Ask host to perform a target reset | |
577 | * @scmd: SCSI cmd used to send a target reset | |
578 | * | |
579 | * Notes: | |
580 | * There is no timeout for this operation. if this operation is | |
581 | * unreliable for a given host, then the host itself needs to put a | |
582 | * timer on it, and set the host back to a consistent state prior to | |
583 | * returning. | |
584 | */ | |
585 | static int scsi_try_target_reset(struct scsi_cmnd *scmd) | |
586 | { | |
587 | unsigned long flags; | |
588 | int rtn; | |
0bf8c869 JJ |
589 | struct Scsi_Host *host = scmd->device->host; |
590 | struct scsi_host_template *hostt = host->hostt; | |
30bd7df8 | 591 | |
0bf8c869 | 592 | if (!hostt->eh_target_reset_handler) |
30bd7df8 MC |
593 | return FAILED; |
594 | ||
0bf8c869 | 595 | rtn = hostt->eh_target_reset_handler(scmd); |
30bd7df8 | 596 | if (rtn == SUCCESS) { |
0bf8c869 | 597 | spin_lock_irqsave(host->host_lock, flags); |
30bd7df8 MC |
598 | __starget_for_each_device(scsi_target(scmd->device), NULL, |
599 | __scsi_report_device_reset); | |
0bf8c869 | 600 | spin_unlock_irqrestore(host->host_lock, flags); |
30bd7df8 MC |
601 | } |
602 | ||
603 | return rtn; | |
604 | } | |
605 | ||
292148f8 BK |
606 | /** |
607 | * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev | |
608 | * @scmd: SCSI cmd used to send BDR | |
609 | * | |
610 | * Notes: | |
611 | * There is no timeout for this operation. if this operation is | |
612 | * unreliable for a given host, then the host itself needs to put a | |
613 | * timer on it, and set the host back to a consistent state prior to | |
614 | * returning. | |
dc8875e1 | 615 | */ |
292148f8 BK |
616 | static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd) |
617 | { | |
618 | int rtn; | |
0bf8c869 | 619 | struct scsi_host_template *hostt = scmd->device->host->hostt; |
292148f8 | 620 | |
0bf8c869 | 621 | if (!hostt->eh_device_reset_handler) |
292148f8 BK |
622 | return FAILED; |
623 | ||
0bf8c869 | 624 | rtn = hostt->eh_device_reset_handler(scmd); |
30bd7df8 MC |
625 | if (rtn == SUCCESS) |
626 | __scsi_report_device_reset(scmd->device, NULL); | |
292148f8 BK |
627 | return rtn; |
628 | } | |
629 | ||
0bf8c869 | 630 | static int scsi_try_to_abort_cmd(struct scsi_host_template *hostt, struct scsi_cmnd *scmd) |
292148f8 | 631 | { |
0bf8c869 | 632 | if (!hostt->eh_abort_handler) |
292148f8 BK |
633 | return FAILED; |
634 | ||
0bf8c869 | 635 | return hostt->eh_abort_handler(scmd); |
292148f8 BK |
636 | } |
637 | ||
292148f8 BK |
638 | static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd) |
639 | { | |
0bf8c869 | 640 | if (scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd) != SUCCESS) |
292148f8 | 641 | if (scsi_try_bus_device_reset(scmd) != SUCCESS) |
30bd7df8 MC |
642 | if (scsi_try_target_reset(scmd) != SUCCESS) |
643 | if (scsi_try_bus_reset(scmd) != SUCCESS) | |
644 | scsi_try_host_reset(scmd); | |
292148f8 BK |
645 | } |
646 | ||
1da177e4 | 647 | /** |
e1c23468 | 648 | * scsi_eh_prep_cmnd - Save a scsi command info as part of error recory |
2dc611de | 649 | * @scmd: SCSI command structure to hijack |
e1c23468 | 650 | * @ses: structure to save restore information |
55db6c1b | 651 | * @cmnd: CDB to send. Can be NULL if no new cmnd is needed |
64a87b24 | 652 | * @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB) |
55db6c1b | 653 | * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored) |
2dc611de | 654 | * |
e1c23468 | 655 | * This function is used to save a scsi command information before re-execution |
55db6c1b BH |
656 | * as part of the error recovery process. If @sense_bytes is 0 the command |
657 | * sent must be one that does not transfer any data. If @sense_bytes != 0 | |
658 | * @cmnd is ignored and this functions sets up a REQUEST_SENSE command | |
659 | * and cmnd buffers to read @sense_bytes into @scmd->sense_buffer. | |
dc8875e1 | 660 | */ |
e1c23468 BH |
661 | void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, |
662 | unsigned char *cmnd, int cmnd_size, unsigned sense_bytes) | |
1da177e4 | 663 | { |
f59114b7 | 664 | struct scsi_device *sdev = scmd->device; |
1da177e4 | 665 | |
631c228c CH |
666 | /* |
667 | * We need saved copies of a number of fields - this is because | |
668 | * error handling may need to overwrite these with different values | |
669 | * to run different commands, and once error handling is complete, | |
670 | * we will need to restore these values prior to running the actual | |
671 | * command. | |
672 | */ | |
e1c23468 | 673 | ses->cmd_len = scmd->cmd_len; |
64a87b24 | 674 | ses->cmnd = scmd->cmnd; |
e1c23468 | 675 | ses->data_direction = scmd->sc_data_direction; |
30b0c37b | 676 | ses->sdb = scmd->sdb; |
6f9a35e2 | 677 | ses->next_rq = scmd->request->next_rq; |
e1c23468 | 678 | ses->result = scmd->result; |
12265709 | 679 | ses->underflow = scmd->underflow; |
db007fc5 | 680 | ses->prot_op = scmd->prot_op; |
631c228c | 681 | |
db007fc5 | 682 | scmd->prot_op = SCSI_PROT_NORMAL; |
64a87b24 BH |
683 | scmd->cmnd = ses->eh_cmnd; |
684 | memset(scmd->cmnd, 0, BLK_MAX_CDB); | |
30b0c37b | 685 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
6f9a35e2 | 686 | scmd->request->next_rq = NULL; |
30b0c37b | 687 | |
55db6c1b | 688 | if (sense_bytes) { |
30b0c37b BH |
689 | scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE, |
690 | sense_bytes); | |
e1c23468 | 691 | sg_init_one(&ses->sense_sgl, scmd->sense_buffer, |
30b0c37b BH |
692 | scmd->sdb.length); |
693 | scmd->sdb.table.sgl = &ses->sense_sgl; | |
55db6c1b | 694 | scmd->sc_data_direction = DMA_FROM_DEVICE; |
30b0c37b | 695 | scmd->sdb.table.nents = 1; |
55db6c1b | 696 | scmd->cmnd[0] = REQUEST_SENSE; |
30b0c37b | 697 | scmd->cmnd[4] = scmd->sdb.length; |
55db6c1b | 698 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); |
631c228c | 699 | } else { |
631c228c | 700 | scmd->sc_data_direction = DMA_NONE; |
55db6c1b | 701 | if (cmnd) { |
64a87b24 | 702 | BUG_ON(cmnd_size > BLK_MAX_CDB); |
55db6c1b BH |
703 | memcpy(scmd->cmnd, cmnd, cmnd_size); |
704 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); | |
705 | } | |
631c228c CH |
706 | } |
707 | ||
708 | scmd->underflow = 0; | |
631c228c | 709 | |
55db6c1b | 710 | if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN) |
1da177e4 | 711 | scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) | |
f59114b7 | 712 | (sdev->lun << 5 & 0xe0); |
1da177e4 | 713 | |
631c228c CH |
714 | /* |
715 | * Zero the sense buffer. The scsi spec mandates that any | |
716 | * untransferred sense data should be interpreted as being zero. | |
717 | */ | |
b80ca4f7 | 718 | memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); |
e1c23468 BH |
719 | } |
720 | EXPORT_SYMBOL(scsi_eh_prep_cmnd); | |
721 | ||
722 | /** | |
723 | * scsi_eh_restore_cmnd - Restore a scsi command info as part of error recory | |
724 | * @scmd: SCSI command structure to restore | |
477e608c | 725 | * @ses: saved information from a coresponding call to scsi_eh_prep_cmnd |
e1c23468 | 726 | * |
477e608c | 727 | * Undo any damage done by above scsi_eh_prep_cmnd(). |
dc8875e1 | 728 | */ |
e1c23468 BH |
729 | void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses) |
730 | { | |
731 | /* | |
732 | * Restore original data | |
733 | */ | |
734 | scmd->cmd_len = ses->cmd_len; | |
64a87b24 | 735 | scmd->cmnd = ses->cmnd; |
e1c23468 | 736 | scmd->sc_data_direction = ses->data_direction; |
30b0c37b | 737 | scmd->sdb = ses->sdb; |
6f9a35e2 | 738 | scmd->request->next_rq = ses->next_rq; |
e1c23468 | 739 | scmd->result = ses->result; |
12265709 | 740 | scmd->underflow = ses->underflow; |
db007fc5 | 741 | scmd->prot_op = ses->prot_op; |
e1c23468 BH |
742 | } |
743 | EXPORT_SYMBOL(scsi_eh_restore_cmnd); | |
631c228c | 744 | |
e1c23468 BH |
745 | /** |
746 | * scsi_send_eh_cmnd - submit a scsi command as part of error recory | |
747 | * @scmd: SCSI command structure to hijack | |
748 | * @cmnd: CDB to send | |
749 | * @cmnd_size: size in bytes of @cmnd | |
750 | * @timeout: timeout for this request | |
751 | * @sense_bytes: size of sense data to copy or 0 | |
752 | * | |
753 | * This function is used to send a scsi command down to a target device | |
754 | * as part of the error recovery process. See also scsi_eh_prep_cmnd() above. | |
755 | * | |
756 | * Return value: | |
757 | * SUCCESS or FAILED or NEEDS_RETRY | |
dc8875e1 | 758 | */ |
e1c23468 BH |
759 | static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd, |
760 | int cmnd_size, int timeout, unsigned sense_bytes) | |
761 | { | |
762 | struct scsi_device *sdev = scmd->device; | |
763 | struct Scsi_Host *shost = sdev->host; | |
764 | DECLARE_COMPLETION_ONSTACK(done); | |
765 | unsigned long timeleft; | |
e1c23468 BH |
766 | struct scsi_eh_save ses; |
767 | int rtn; | |
768 | ||
769 | scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes); | |
7dfdc9a5 | 770 | shost->eh_action = &done; |
1da177e4 | 771 | |
1da177e4 | 772 | scsi_log_send(scmd); |
f281233d JG |
773 | scmd->scsi_done = scsi_eh_done; |
774 | shost->hostt->queuecommand(shost, scmd); | |
1da177e4 | 775 | |
7dfdc9a5 | 776 | timeleft = wait_for_completion_timeout(&done, timeout); |
1da177e4 | 777 | |
f59114b7 | 778 | shost->eh_action = NULL; |
1da177e4 | 779 | |
7dfdc9a5 | 780 | scsi_log_completion(scmd, SUCCESS); |
1da177e4 | 781 | |
7dfdc9a5 CH |
782 | SCSI_LOG_ERROR_RECOVERY(3, |
783 | printk("%s: scmd: %p, timeleft: %ld\n", | |
cadbd4a5 | 784 | __func__, scmd, timeleft)); |
1da177e4 LT |
785 | |
786 | /* | |
7dfdc9a5 CH |
787 | * If there is time left scsi_eh_done got called, and we will |
788 | * examine the actual status codes to see whether the command | |
789 | * actually did complete normally, else tell the host to forget | |
790 | * about this command. | |
1da177e4 | 791 | */ |
7dfdc9a5 | 792 | if (timeleft) { |
1da177e4 LT |
793 | rtn = scsi_eh_completed_normally(scmd); |
794 | SCSI_LOG_ERROR_RECOVERY(3, | |
795 | printk("%s: scsi_eh_completed_normally %x\n", | |
cadbd4a5 | 796 | __func__, rtn)); |
7dfdc9a5 | 797 | |
1da177e4 LT |
798 | switch (rtn) { |
799 | case SUCCESS: | |
800 | case NEEDS_RETRY: | |
801 | case FAILED: | |
63583cca | 802 | case TARGET_ERROR: |
1da177e4 | 803 | break; |
6e883b0e HR |
804 | case ADD_TO_MLQUEUE: |
805 | rtn = NEEDS_RETRY; | |
806 | break; | |
1da177e4 LT |
807 | default: |
808 | rtn = FAILED; | |
809 | break; | |
810 | } | |
7dfdc9a5 | 811 | } else { |
292148f8 | 812 | scsi_abort_eh_cmnd(scmd); |
7dfdc9a5 | 813 | rtn = FAILED; |
1da177e4 LT |
814 | } |
815 | ||
e1c23468 | 816 | scsi_eh_restore_cmnd(scmd, &ses); |
1da177e4 LT |
817 | return rtn; |
818 | } | |
819 | ||
820 | /** | |
821 | * scsi_request_sense - Request sense data from a particular target. | |
822 | * @scmd: SCSI cmd for request sense. | |
823 | * | |
824 | * Notes: | |
825 | * Some hosts automatically obtain this information, others require | |
826 | * that we obtain it on our own. This function will *not* return until | |
827 | * the command either times out, or it completes. | |
dc8875e1 | 828 | */ |
1da177e4 LT |
829 | static int scsi_request_sense(struct scsi_cmnd *scmd) |
830 | { | |
55db6c1b | 831 | return scsi_send_eh_cmnd(scmd, NULL, 0, SENSE_TIMEOUT, ~0); |
1da177e4 LT |
832 | } |
833 | ||
834 | /** | |
835 | * scsi_eh_finish_cmd - Handle a cmd that eh is finished with. | |
836 | * @scmd: Original SCSI cmd that eh has finished. | |
837 | * @done_q: Queue for processed commands. | |
838 | * | |
839 | * Notes: | |
840 | * We don't want to use the normal command completion while we are are | |
841 | * still handling errors - it may cause other commands to be queued, | |
eb44820c | 842 | * and that would disturb what we are doing. Thus we really want to |
1da177e4 LT |
843 | * keep a list of pending commands for final completion, and once we |
844 | * are ready to leave error handling we handle completion for real. | |
dc8875e1 | 845 | */ |
041c5fc3 | 846 | void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q) |
1da177e4 LT |
847 | { |
848 | scmd->device->host->host_failed--; | |
3111b0d1 | 849 | scmd->eh_eflags = 0; |
1da177e4 LT |
850 | list_move_tail(&scmd->eh_entry, done_q); |
851 | } | |
041c5fc3 | 852 | EXPORT_SYMBOL(scsi_eh_finish_cmd); |
1da177e4 LT |
853 | |
854 | /** | |
855 | * scsi_eh_get_sense - Get device sense data. | |
856 | * @work_q: Queue of commands to process. | |
eb44820c | 857 | * @done_q: Queue of processed commands. |
1da177e4 LT |
858 | * |
859 | * Description: | |
860 | * See if we need to request sense information. if so, then get it | |
0bf8c869 | 861 | * now, so we have a better idea of what to do. |
1da177e4 LT |
862 | * |
863 | * Notes: | |
864 | * This has the unfortunate side effect that if a shost adapter does | |
eb44820c | 865 | * not automatically request sense information, we end up shutting |
1da177e4 LT |
866 | * it down before we request it. |
867 | * | |
868 | * All drivers should request sense information internally these days, | |
869 | * so for now all I have to say is tough noogies if you end up in here. | |
870 | * | |
871 | * XXX: Long term this code should go away, but that needs an audit of | |
872 | * all LLDDs first. | |
dc8875e1 | 873 | */ |
dca84e46 DW |
874 | int scsi_eh_get_sense(struct list_head *work_q, |
875 | struct list_head *done_q) | |
1da177e4 | 876 | { |
937abeaa | 877 | struct scsi_cmnd *scmd, *next; |
1da177e4 LT |
878 | int rtn; |
879 | ||
937abeaa | 880 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 881 | if ((scmd->eh_eflags & SCSI_EH_CANCEL_CMD) || |
1da177e4 LT |
882 | SCSI_SENSE_VALID(scmd)) |
883 | continue; | |
884 | ||
3bf743e7 JG |
885 | SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd, |
886 | "%s: requesting sense\n", | |
887 | current->comm)); | |
1da177e4 LT |
888 | rtn = scsi_request_sense(scmd); |
889 | if (rtn != SUCCESS) | |
890 | continue; | |
891 | ||
892 | SCSI_LOG_ERROR_RECOVERY(3, printk("sense requested for %p" | |
893 | " result %x\n", scmd, | |
894 | scmd->result)); | |
895 | SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense("bh", scmd)); | |
896 | ||
897 | rtn = scsi_decide_disposition(scmd); | |
898 | ||
899 | /* | |
900 | * if the result was normal, then just pass it along to the | |
901 | * upper level. | |
902 | */ | |
903 | if (rtn == SUCCESS) | |
904 | /* we don't want this command reissued, just | |
905 | * finished with the sense data, so set | |
906 | * retries to the max allowed to ensure it | |
907 | * won't get reissued */ | |
908 | scmd->retries = scmd->allowed; | |
909 | else if (rtn != NEEDS_RETRY) | |
910 | continue; | |
911 | ||
912 | scsi_eh_finish_cmd(scmd, done_q); | |
913 | } | |
914 | ||
915 | return list_empty(work_q); | |
916 | } | |
dca84e46 | 917 | EXPORT_SYMBOL_GPL(scsi_eh_get_sense); |
1da177e4 | 918 | |
1da177e4 LT |
919 | /** |
920 | * scsi_eh_tur - Send TUR to device. | |
eb44820c | 921 | * @scmd: &scsi_cmnd to send TUR |
1da177e4 LT |
922 | * |
923 | * Return value: | |
924 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 925 | */ |
1da177e4 LT |
926 | static int scsi_eh_tur(struct scsi_cmnd *scmd) |
927 | { | |
928 | static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0}; | |
929 | int retry_cnt = 1, rtn; | |
930 | ||
931 | retry_tur: | |
0db99e33 | 932 | rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, SENSE_TIMEOUT, 0); |
1da177e4 | 933 | |
1da177e4 | 934 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd %p rtn %x\n", |
cadbd4a5 | 935 | __func__, scmd, rtn)); |
631c228c CH |
936 | |
937 | switch (rtn) { | |
938 | case NEEDS_RETRY: | |
1da177e4 LT |
939 | if (retry_cnt--) |
940 | goto retry_tur; | |
631c228c CH |
941 | /*FALLTHRU*/ |
942 | case SUCCESS: | |
e47373ec | 943 | return 0; |
631c228c CH |
944 | default: |
945 | return 1; | |
e47373ec | 946 | } |
1da177e4 LT |
947 | } |
948 | ||
949 | /** | |
eb44820c RL |
950 | * scsi_eh_abort_cmds - abort pending commands. |
951 | * @work_q: &list_head for pending commands. | |
952 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
953 | * |
954 | * Decription: | |
955 | * Try and see whether or not it makes sense to try and abort the | |
eb44820c RL |
956 | * running command. This only works out to be the case if we have one |
957 | * command that has timed out. If the command simply failed, it makes | |
1da177e4 LT |
958 | * no sense to try and abort the command, since as far as the shost |
959 | * adapter is concerned, it isn't running. | |
dc8875e1 | 960 | */ |
1da177e4 LT |
961 | static int scsi_eh_abort_cmds(struct list_head *work_q, |
962 | struct list_head *done_q) | |
963 | { | |
937abeaa | 964 | struct scsi_cmnd *scmd, *next; |
1da177e4 LT |
965 | int rtn; |
966 | ||
937abeaa | 967 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 968 | if (!(scmd->eh_eflags & SCSI_EH_CANCEL_CMD)) |
1da177e4 LT |
969 | continue; |
970 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting cmd:" | |
971 | "0x%p\n", current->comm, | |
972 | scmd)); | |
0bf8c869 | 973 | rtn = scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd); |
2f2eb587 | 974 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
3111b0d1 | 975 | scmd->eh_eflags &= ~SCSI_EH_CANCEL_CMD; |
1da177e4 | 976 | if (!scsi_device_online(scmd->device) || |
2f2eb587 | 977 | rtn == FAST_IO_FAIL || |
1da177e4 LT |
978 | !scsi_eh_tur(scmd)) { |
979 | scsi_eh_finish_cmd(scmd, done_q); | |
980 | } | |
1da177e4 LT |
981 | } else |
982 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting" | |
983 | " cmd failed:" | |
984 | "0x%p\n", | |
985 | current->comm, | |
986 | scmd)); | |
987 | } | |
988 | ||
989 | return list_empty(work_q); | |
990 | } | |
991 | ||
1da177e4 LT |
992 | /** |
993 | * scsi_eh_try_stu - Send START_UNIT to device. | |
eb44820c | 994 | * @scmd: &scsi_cmnd to send START_UNIT |
1da177e4 LT |
995 | * |
996 | * Return value: | |
997 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 998 | */ |
1da177e4 LT |
999 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd) |
1000 | { | |
1001 | static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0}; | |
1da177e4 | 1002 | |
631c228c | 1003 | if (scmd->device->allow_restart) { |
ed773e66 BK |
1004 | int i, rtn = NEEDS_RETRY; |
1005 | ||
1006 | for (i = 0; rtn == NEEDS_RETRY && i < 2; i++) | |
9728c081 | 1007 | rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0); |
1da177e4 | 1008 | |
631c228c CH |
1009 | if (rtn == SUCCESS) |
1010 | return 0; | |
1011 | } | |
1da177e4 | 1012 | |
1da177e4 LT |
1013 | return 1; |
1014 | } | |
1015 | ||
1016 | /** | |
1017 | * scsi_eh_stu - send START_UNIT if needed | |
eb44820c RL |
1018 | * @shost: &scsi host being recovered. |
1019 | * @work_q: &list_head for pending commands. | |
1020 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1021 | * |
1022 | * Notes: | |
1023 | * If commands are failing due to not ready, initializing command required, | |
0bf8c869 | 1024 | * try revalidating the device, which will end up sending a start unit. |
dc8875e1 | 1025 | */ |
1da177e4 LT |
1026 | static int scsi_eh_stu(struct Scsi_Host *shost, |
1027 | struct list_head *work_q, | |
1028 | struct list_head *done_q) | |
1029 | { | |
937abeaa | 1030 | struct scsi_cmnd *scmd, *stu_scmd, *next; |
1da177e4 LT |
1031 | struct scsi_device *sdev; |
1032 | ||
1033 | shost_for_each_device(sdev, shost) { | |
1034 | stu_scmd = NULL; | |
1035 | list_for_each_entry(scmd, work_q, eh_entry) | |
1036 | if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) && | |
1037 | scsi_check_sense(scmd) == FAILED ) { | |
1038 | stu_scmd = scmd; | |
1039 | break; | |
1040 | } | |
1041 | ||
1042 | if (!stu_scmd) | |
1043 | continue; | |
1044 | ||
1045 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending START_UNIT to sdev:" | |
1046 | " 0x%p\n", current->comm, sdev)); | |
1047 | ||
1048 | if (!scsi_eh_try_stu(stu_scmd)) { | |
1049 | if (!scsi_device_online(sdev) || | |
1050 | !scsi_eh_tur(stu_scmd)) { | |
937abeaa CH |
1051 | list_for_each_entry_safe(scmd, next, |
1052 | work_q, eh_entry) { | |
1da177e4 LT |
1053 | if (scmd->device == sdev) |
1054 | scsi_eh_finish_cmd(scmd, done_q); | |
1055 | } | |
1056 | } | |
1057 | } else { | |
1058 | SCSI_LOG_ERROR_RECOVERY(3, | |
1059 | printk("%s: START_UNIT failed to sdev:" | |
1060 | " 0x%p\n", current->comm, sdev)); | |
1061 | } | |
1062 | } | |
1063 | ||
1064 | return list_empty(work_q); | |
1065 | } | |
1066 | ||
1067 | ||
1068 | /** | |
1069 | * scsi_eh_bus_device_reset - send bdr if needed | |
1070 | * @shost: scsi host being recovered. | |
eb44820c RL |
1071 | * @work_q: &list_head for pending commands. |
1072 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1073 | * |
1074 | * Notes: | |
eb44820c | 1075 | * Try a bus device reset. Still, look to see whether we have multiple |
1da177e4 LT |
1076 | * devices that are jammed or not - if we have multiple devices, it |
1077 | * makes no sense to try bus_device_reset - we really would need to try | |
0bf8c869 | 1078 | * a bus_reset instead. |
dc8875e1 | 1079 | */ |
1da177e4 LT |
1080 | static int scsi_eh_bus_device_reset(struct Scsi_Host *shost, |
1081 | struct list_head *work_q, | |
1082 | struct list_head *done_q) | |
1083 | { | |
937abeaa | 1084 | struct scsi_cmnd *scmd, *bdr_scmd, *next; |
1da177e4 LT |
1085 | struct scsi_device *sdev; |
1086 | int rtn; | |
1087 | ||
1088 | shost_for_each_device(sdev, shost) { | |
1089 | bdr_scmd = NULL; | |
1090 | list_for_each_entry(scmd, work_q, eh_entry) | |
1091 | if (scmd->device == sdev) { | |
1092 | bdr_scmd = scmd; | |
1093 | break; | |
1094 | } | |
1095 | ||
1096 | if (!bdr_scmd) | |
1097 | continue; | |
1098 | ||
1099 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BDR sdev:" | |
1100 | " 0x%p\n", current->comm, | |
1101 | sdev)); | |
1102 | rtn = scsi_try_bus_device_reset(bdr_scmd); | |
2f2eb587 | 1103 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
1da177e4 | 1104 | if (!scsi_device_online(sdev) || |
2f2eb587 | 1105 | rtn == FAST_IO_FAIL || |
1da177e4 | 1106 | !scsi_eh_tur(bdr_scmd)) { |
937abeaa CH |
1107 | list_for_each_entry_safe(scmd, next, |
1108 | work_q, eh_entry) { | |
1da177e4 LT |
1109 | if (scmd->device == sdev) |
1110 | scsi_eh_finish_cmd(scmd, | |
1111 | done_q); | |
1112 | } | |
1113 | } | |
1114 | } else { | |
1115 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BDR" | |
1116 | " failed sdev:" | |
1117 | "0x%p\n", | |
1118 | current->comm, | |
1119 | sdev)); | |
1120 | } | |
1121 | } | |
1122 | ||
1123 | return list_empty(work_q); | |
1124 | } | |
1125 | ||
30bd7df8 MC |
1126 | /** |
1127 | * scsi_eh_target_reset - send target reset if needed | |
1128 | * @shost: scsi host being recovered. | |
1129 | * @work_q: &list_head for pending commands. | |
1130 | * @done_q: &list_head for processed commands. | |
1131 | * | |
1132 | * Notes: | |
1133 | * Try a target reset. | |
1134 | */ | |
1135 | static int scsi_eh_target_reset(struct Scsi_Host *shost, | |
1136 | struct list_head *work_q, | |
1137 | struct list_head *done_q) | |
1138 | { | |
98db5195 | 1139 | LIST_HEAD(tmp_list); |
30bd7df8 | 1140 | |
98db5195 JB |
1141 | list_splice_init(work_q, &tmp_list); |
1142 | ||
1143 | while (!list_empty(&tmp_list)) { | |
1144 | struct scsi_cmnd *next, *scmd; | |
1145 | int rtn; | |
1146 | unsigned int id; | |
1147 | ||
1148 | scmd = list_entry(tmp_list.next, struct scsi_cmnd, eh_entry); | |
1149 | id = scmd_id(scmd); | |
30bd7df8 MC |
1150 | |
1151 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending target reset " | |
1152 | "to target %d\n", | |
1153 | current->comm, id)); | |
98db5195 JB |
1154 | rtn = scsi_try_target_reset(scmd); |
1155 | if (rtn != SUCCESS && rtn != FAST_IO_FAIL) | |
30bd7df8 MC |
1156 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Target reset" |
1157 | " failed target: " | |
1158 | "%d\n", | |
1159 | current->comm, id)); | |
98db5195 JB |
1160 | list_for_each_entry_safe(scmd, next, &tmp_list, eh_entry) { |
1161 | if (scmd_id(scmd) != id) | |
1162 | continue; | |
1163 | ||
1164 | if ((rtn == SUCCESS || rtn == FAST_IO_FAIL) | |
1165 | && (!scsi_device_online(scmd->device) || | |
1166 | rtn == FAST_IO_FAIL || !scsi_eh_tur(scmd))) | |
1167 | scsi_eh_finish_cmd(scmd, done_q); | |
1168 | else | |
1169 | /* push back on work queue for further processing */ | |
1170 | list_move(&scmd->eh_entry, work_q); | |
1171 | } | |
1172 | } | |
30bd7df8 MC |
1173 | |
1174 | return list_empty(work_q); | |
1175 | } | |
1176 | ||
1da177e4 | 1177 | /** |
0bf8c869 | 1178 | * scsi_eh_bus_reset - send a bus reset |
eb44820c RL |
1179 | * @shost: &scsi host being recovered. |
1180 | * @work_q: &list_head for pending commands. | |
1181 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1182 | */ |
1da177e4 LT |
1183 | static int scsi_eh_bus_reset(struct Scsi_Host *shost, |
1184 | struct list_head *work_q, | |
1185 | struct list_head *done_q) | |
1186 | { | |
937abeaa | 1187 | struct scsi_cmnd *scmd, *chan_scmd, *next; |
1da177e4 LT |
1188 | unsigned int channel; |
1189 | int rtn; | |
1190 | ||
1191 | /* | |
1192 | * we really want to loop over the various channels, and do this on | |
1193 | * a channel by channel basis. we should also check to see if any | |
1194 | * of the failed commands are on soft_reset devices, and if so, skip | |
0bf8c869 | 1195 | * the reset. |
1da177e4 LT |
1196 | */ |
1197 | ||
1198 | for (channel = 0; channel <= shost->max_channel; channel++) { | |
1199 | chan_scmd = NULL; | |
1200 | list_for_each_entry(scmd, work_q, eh_entry) { | |
422c0d61 | 1201 | if (channel == scmd_channel(scmd)) { |
1da177e4 LT |
1202 | chan_scmd = scmd; |
1203 | break; | |
1204 | /* | |
1205 | * FIXME add back in some support for | |
1206 | * soft_reset devices. | |
1207 | */ | |
1208 | } | |
1209 | } | |
1210 | ||
1211 | if (!chan_scmd) | |
1212 | continue; | |
1213 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BRST chan:" | |
1214 | " %d\n", current->comm, | |
1215 | channel)); | |
1216 | rtn = scsi_try_bus_reset(chan_scmd); | |
2f2eb587 | 1217 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
937abeaa | 1218 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
422c0d61 | 1219 | if (channel == scmd_channel(scmd)) |
1da177e4 | 1220 | if (!scsi_device_online(scmd->device) || |
2f2eb587 | 1221 | rtn == FAST_IO_FAIL || |
1da177e4 LT |
1222 | !scsi_eh_tur(scmd)) |
1223 | scsi_eh_finish_cmd(scmd, | |
1224 | done_q); | |
1225 | } | |
1226 | } else { | |
1227 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BRST" | |
1228 | " failed chan: %d\n", | |
1229 | current->comm, | |
1230 | channel)); | |
1231 | } | |
1232 | } | |
1233 | return list_empty(work_q); | |
1234 | } | |
1235 | ||
1236 | /** | |
0bf8c869 | 1237 | * scsi_eh_host_reset - send a host reset |
1da177e4 LT |
1238 | * @work_q: list_head for processed commands. |
1239 | * @done_q: list_head for processed commands. | |
dc8875e1 | 1240 | */ |
1da177e4 LT |
1241 | static int scsi_eh_host_reset(struct list_head *work_q, |
1242 | struct list_head *done_q) | |
1243 | { | |
937abeaa | 1244 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1245 | int rtn; |
1da177e4 LT |
1246 | |
1247 | if (!list_empty(work_q)) { | |
1248 | scmd = list_entry(work_q->next, | |
1249 | struct scsi_cmnd, eh_entry); | |
1250 | ||
1251 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending HRST\n" | |
1252 | , current->comm)); | |
1253 | ||
1254 | rtn = scsi_try_host_reset(scmd); | |
2f2eb587 | 1255 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
937abeaa | 1256 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1da177e4 | 1257 | if (!scsi_device_online(scmd->device) || |
2f2eb587 | 1258 | rtn == FAST_IO_FAIL || |
1da177e4 LT |
1259 | (!scsi_eh_try_stu(scmd) && !scsi_eh_tur(scmd)) || |
1260 | !scsi_eh_tur(scmd)) | |
1261 | scsi_eh_finish_cmd(scmd, done_q); | |
1262 | } | |
1263 | } else { | |
1264 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: HRST" | |
1265 | " failed\n", | |
1266 | current->comm)); | |
1267 | } | |
1268 | } | |
1269 | return list_empty(work_q); | |
1270 | } | |
1271 | ||
1272 | /** | |
1273 | * scsi_eh_offline_sdevs - offline scsi devices that fail to recover | |
1274 | * @work_q: list_head for processed commands. | |
1275 | * @done_q: list_head for processed commands. | |
dc8875e1 | 1276 | */ |
1da177e4 LT |
1277 | static void scsi_eh_offline_sdevs(struct list_head *work_q, |
1278 | struct list_head *done_q) | |
1279 | { | |
937abeaa | 1280 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1281 | |
937abeaa | 1282 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
31765d7d MW |
1283 | sdev_printk(KERN_INFO, scmd->device, "Device offlined - " |
1284 | "not ready after error recovery\n"); | |
1da177e4 | 1285 | scsi_device_set_state(scmd->device, SDEV_OFFLINE); |
3111b0d1 | 1286 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) { |
1da177e4 LT |
1287 | /* |
1288 | * FIXME: Handle lost cmds. | |
1289 | */ | |
1290 | } | |
1291 | scsi_eh_finish_cmd(scmd, done_q); | |
1292 | } | |
1293 | return; | |
1294 | } | |
1295 | ||
4a27446f MC |
1296 | /** |
1297 | * scsi_noretry_cmd - determinte if command should be failed fast | |
1298 | * @scmd: SCSI cmd to examine. | |
1299 | */ | |
1300 | int scsi_noretry_cmd(struct scsi_cmnd *scmd) | |
1301 | { | |
1302 | switch (host_byte(scmd->result)) { | |
1303 | case DID_OK: | |
1304 | break; | |
1305 | case DID_BUS_BUSY: | |
33659ebb | 1306 | return (scmd->request->cmd_flags & REQ_FAILFAST_TRANSPORT); |
4a27446f | 1307 | case DID_PARITY: |
33659ebb | 1308 | return (scmd->request->cmd_flags & REQ_FAILFAST_DEV); |
4a27446f MC |
1309 | case DID_ERROR: |
1310 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1311 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1312 | return 0; | |
1313 | /* fall through */ | |
1314 | case DID_SOFT_ERROR: | |
33659ebb | 1315 | return (scmd->request->cmd_flags & REQ_FAILFAST_DRIVER); |
4a27446f MC |
1316 | } |
1317 | ||
1318 | switch (status_byte(scmd->result)) { | |
1319 | case CHECK_CONDITION: | |
1320 | /* | |
1321 | * assume caller has checked sense and determinted | |
1322 | * the check condition was retryable. | |
1323 | */ | |
e96f6abe FT |
1324 | if (scmd->request->cmd_flags & REQ_FAILFAST_DEV || |
1325 | scmd->request->cmd_type == REQ_TYPE_BLOCK_PC) | |
1326 | return 1; | |
4a27446f MC |
1327 | } |
1328 | ||
1329 | return 0; | |
1330 | } | |
1331 | ||
1da177e4 LT |
1332 | /** |
1333 | * scsi_decide_disposition - Disposition a cmd on return from LLD. | |
1334 | * @scmd: SCSI cmd to examine. | |
1335 | * | |
1336 | * Notes: | |
1337 | * This is *only* called when we are examining the status after sending | |
1338 | * out the actual data command. any commands that are queued for error | |
1339 | * recovery (e.g. test_unit_ready) do *not* come through here. | |
1340 | * | |
1341 | * When this routine returns failed, it means the error handler thread | |
1342 | * is woken. In cases where the error code indicates an error that | |
1343 | * doesn't require the error handler read (i.e. we don't need to | |
1344 | * abort/reset), this function should return SUCCESS. | |
dc8875e1 | 1345 | */ |
1da177e4 LT |
1346 | int scsi_decide_disposition(struct scsi_cmnd *scmd) |
1347 | { | |
1348 | int rtn; | |
1349 | ||
1350 | /* | |
1351 | * if the device is offline, then we clearly just pass the result back | |
1352 | * up to the top level. | |
1353 | */ | |
1354 | if (!scsi_device_online(scmd->device)) { | |
1355 | SCSI_LOG_ERROR_RECOVERY(5, printk("%s: device offline - report" | |
1356 | " as SUCCESS\n", | |
cadbd4a5 | 1357 | __func__)); |
1da177e4 LT |
1358 | return SUCCESS; |
1359 | } | |
1360 | ||
1361 | /* | |
1362 | * first check the host byte, to see if there is anything in there | |
1363 | * that would indicate what we need to do. | |
1364 | */ | |
1365 | switch (host_byte(scmd->result)) { | |
1366 | case DID_PASSTHROUGH: | |
1367 | /* | |
1368 | * no matter what, pass this through to the upper layer. | |
1369 | * nuke this special code so that it looks like we are saying | |
1370 | * did_ok. | |
1371 | */ | |
1372 | scmd->result &= 0xff00ffff; | |
1373 | return SUCCESS; | |
1374 | case DID_OK: | |
1375 | /* | |
1376 | * looks good. drop through, and check the next byte. | |
1377 | */ | |
1378 | break; | |
1379 | case DID_NO_CONNECT: | |
1380 | case DID_BAD_TARGET: | |
1381 | case DID_ABORT: | |
1382 | /* | |
1383 | * note - this means that we just report the status back | |
1384 | * to the top level driver, not that we actually think | |
1385 | * that it indicates SUCCESS. | |
1386 | */ | |
1387 | return SUCCESS; | |
1388 | /* | |
1389 | * when the low level driver returns did_soft_error, | |
0bf8c869 | 1390 | * it is responsible for keeping an internal retry counter |
1da177e4 LT |
1391 | * in order to avoid endless loops (db) |
1392 | * | |
1393 | * actually this is a bug in this function here. we should | |
1394 | * be mindful of the maximum number of retries specified | |
1395 | * and not get stuck in a loop. | |
1396 | */ | |
1397 | case DID_SOFT_ERROR: | |
1398 | goto maybe_retry; | |
1399 | case DID_IMM_RETRY: | |
1400 | return NEEDS_RETRY; | |
1401 | ||
bf341919 JB |
1402 | case DID_REQUEUE: |
1403 | return ADD_TO_MLQUEUE; | |
a4dfaa6f MC |
1404 | case DID_TRANSPORT_DISRUPTED: |
1405 | /* | |
1406 | * LLD/transport was disrupted during processing of the IO. | |
1407 | * The transport class is now blocked/blocking, | |
1408 | * and the transport will decide what to do with the IO | |
939c2288 MC |
1409 | * based on its timers and recovery capablilities if |
1410 | * there are enough retries. | |
a4dfaa6f | 1411 | */ |
939c2288 | 1412 | goto maybe_retry; |
a4dfaa6f MC |
1413 | case DID_TRANSPORT_FAILFAST: |
1414 | /* | |
1415 | * The transport decided to failfast the IO (most likely | |
1416 | * the fast io fail tmo fired), so send IO directly upwards. | |
1417 | */ | |
1418 | return SUCCESS; | |
1da177e4 LT |
1419 | case DID_ERROR: |
1420 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1421 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1422 | /* | |
1423 | * execute reservation conflict processing code | |
1424 | * lower down | |
1425 | */ | |
1426 | break; | |
1427 | /* fallthrough */ | |
1da177e4 LT |
1428 | case DID_BUS_BUSY: |
1429 | case DID_PARITY: | |
1430 | goto maybe_retry; | |
1431 | case DID_TIME_OUT: | |
1432 | /* | |
1433 | * when we scan the bus, we get timeout messages for | |
1434 | * these commands if there is no device available. | |
1435 | * other hosts report did_no_connect for the same thing. | |
1436 | */ | |
1437 | if ((scmd->cmnd[0] == TEST_UNIT_READY || | |
1438 | scmd->cmnd[0] == INQUIRY)) { | |
1439 | return SUCCESS; | |
1440 | } else { | |
1441 | return FAILED; | |
1442 | } | |
1443 | case DID_RESET: | |
1444 | return SUCCESS; | |
1445 | default: | |
1446 | return FAILED; | |
1447 | } | |
1448 | ||
1449 | /* | |
1450 | * next, check the message byte. | |
1451 | */ | |
1452 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
1453 | return FAILED; | |
1454 | ||
1455 | /* | |
1456 | * check the status byte to see if this indicates anything special. | |
1457 | */ | |
1458 | switch (status_byte(scmd->result)) { | |
1459 | case QUEUE_FULL: | |
42a6a918 | 1460 | scsi_handle_queue_full(scmd->device); |
1da177e4 LT |
1461 | /* |
1462 | * the case of trying to send too many commands to a | |
1463 | * tagged queueing device. | |
1464 | */ | |
1465 | case BUSY: | |
1466 | /* | |
1467 | * device can't talk to us at the moment. Should only | |
1468 | * occur (SAM-3) when the task queue is empty, so will cause | |
1469 | * the empty queue handling to trigger a stall in the | |
1470 | * device. | |
1471 | */ | |
1472 | return ADD_TO_MLQUEUE; | |
1473 | case GOOD: | |
4a84067d | 1474 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 | 1475 | case COMMAND_TERMINATED: |
1da177e4 | 1476 | return SUCCESS; |
a9b589d9 VB |
1477 | case TASK_ABORTED: |
1478 | goto maybe_retry; | |
1da177e4 LT |
1479 | case CHECK_CONDITION: |
1480 | rtn = scsi_check_sense(scmd); | |
1481 | if (rtn == NEEDS_RETRY) | |
1482 | goto maybe_retry; | |
63583cca HR |
1483 | else if (rtn == TARGET_ERROR) { |
1484 | /* | |
1485 | * Need to modify host byte to signal a | |
1486 | * permanent target failure | |
1487 | */ | |
1488 | scmd->result |= (DID_TARGET_FAILURE << 16); | |
1489 | rtn = SUCCESS; | |
1490 | } | |
1da177e4 LT |
1491 | /* if rtn == FAILED, we have no sense information; |
1492 | * returning FAILED will wake the error handler thread | |
1493 | * to collect the sense and redo the decide | |
1494 | * disposition */ | |
1495 | return rtn; | |
1496 | case CONDITION_GOOD: | |
1497 | case INTERMEDIATE_GOOD: | |
1498 | case INTERMEDIATE_C_GOOD: | |
1499 | case ACA_ACTIVE: | |
1500 | /* | |
1501 | * who knows? FIXME(eric) | |
1502 | */ | |
1503 | return SUCCESS; | |
1504 | ||
1505 | case RESERVATION_CONFLICT: | |
9ccfc756 JB |
1506 | sdev_printk(KERN_INFO, scmd->device, |
1507 | "reservation conflict\n"); | |
63583cca | 1508 | scmd->result |= (DID_NEXUS_FAILURE << 16); |
1da177e4 LT |
1509 | return SUCCESS; /* causes immediate i/o error */ |
1510 | default: | |
1511 | return FAILED; | |
1512 | } | |
1513 | return FAILED; | |
1514 | ||
1515 | maybe_retry: | |
1516 | ||
1517 | /* we requeue for retry because the error was retryable, and | |
1518 | * the request was not marked fast fail. Note that above, | |
1519 | * even if the request is marked fast fail, we still requeue | |
1520 | * for queue congestion conditions (QUEUE_FULL or BUSY) */ | |
8884efab | 1521 | if ((++scmd->retries) <= scmd->allowed |
4a27446f | 1522 | && !scsi_noretry_cmd(scmd)) { |
1da177e4 LT |
1523 | return NEEDS_RETRY; |
1524 | } else { | |
1525 | /* | |
1526 | * no more retries - report this one back to upper level. | |
1527 | */ | |
1528 | return SUCCESS; | |
1529 | } | |
1530 | } | |
1531 | ||
f078727b FT |
1532 | static void eh_lock_door_done(struct request *req, int uptodate) |
1533 | { | |
1534 | __blk_put_request(req->q, req); | |
1535 | } | |
1536 | ||
1da177e4 LT |
1537 | /** |
1538 | * scsi_eh_lock_door - Prevent medium removal for the specified device | |
1539 | * @sdev: SCSI device to prevent medium removal | |
1540 | * | |
1541 | * Locking: | |
91bc31fb | 1542 | * We must be called from process context. |
1da177e4 LT |
1543 | * |
1544 | * Notes: | |
1545 | * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the | |
1546 | * head of the devices request queue, and continue. | |
dc8875e1 | 1547 | */ |
1da177e4 LT |
1548 | static void scsi_eh_lock_door(struct scsi_device *sdev) |
1549 | { | |
f078727b | 1550 | struct request *req; |
1da177e4 | 1551 | |
91bc31fb JB |
1552 | /* |
1553 | * blk_get_request with GFP_KERNEL (__GFP_WAIT) sleeps until a | |
1554 | * request becomes available | |
1555 | */ | |
f078727b | 1556 | req = blk_get_request(sdev->request_queue, READ, GFP_KERNEL); |
1da177e4 | 1557 | |
f078727b FT |
1558 | req->cmd[0] = ALLOW_MEDIUM_REMOVAL; |
1559 | req->cmd[1] = 0; | |
1560 | req->cmd[2] = 0; | |
1561 | req->cmd[3] = 0; | |
1562 | req->cmd[4] = SCSI_REMOVAL_PREVENT; | |
1563 | req->cmd[5] = 0; | |
1da177e4 | 1564 | |
f078727b FT |
1565 | req->cmd_len = COMMAND_SIZE(req->cmd[0]); |
1566 | ||
1567 | req->cmd_type = REQ_TYPE_BLOCK_PC; | |
1568 | req->cmd_flags |= REQ_QUIET; | |
1569 | req->timeout = 10 * HZ; | |
1570 | req->retries = 5; | |
1571 | ||
1572 | blk_execute_rq_nowait(req->q, NULL, req, 1, eh_lock_door_done); | |
1573 | } | |
1da177e4 LT |
1574 | |
1575 | /** | |
1576 | * scsi_restart_operations - restart io operations to the specified host. | |
1577 | * @shost: Host we are restarting. | |
1578 | * | |
1579 | * Notes: | |
1580 | * When we entered the error handler, we blocked all further i/o to | |
1581 | * this device. we need to 'reverse' this process. | |
dc8875e1 | 1582 | */ |
1da177e4 LT |
1583 | static void scsi_restart_operations(struct Scsi_Host *shost) |
1584 | { | |
1585 | struct scsi_device *sdev; | |
939647ee | 1586 | unsigned long flags; |
1da177e4 LT |
1587 | |
1588 | /* | |
1589 | * If the door was locked, we need to insert a door lock request | |
1590 | * onto the head of the SCSI request queue for the device. There | |
1591 | * is no point trying to lock the door of an off-line device. | |
1592 | */ | |
1593 | shost_for_each_device(sdev, shost) { | |
1594 | if (scsi_device_online(sdev) && sdev->locked) | |
1595 | scsi_eh_lock_door(sdev); | |
1596 | } | |
1597 | ||
1598 | /* | |
1599 | * next free up anything directly waiting upon the host. this | |
1600 | * will be requests for character device operations, and also for | |
1601 | * ioctls to queued block devices. | |
1602 | */ | |
1603 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: waking up host to restart\n", | |
cadbd4a5 | 1604 | __func__)); |
1da177e4 | 1605 | |
939647ee JB |
1606 | spin_lock_irqsave(shost->host_lock, flags); |
1607 | if (scsi_host_set_state(shost, SHOST_RUNNING)) | |
1608 | if (scsi_host_set_state(shost, SHOST_CANCEL)) | |
1609 | BUG_ON(scsi_host_set_state(shost, SHOST_DEL)); | |
1610 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
1611 | |
1612 | wake_up(&shost->host_wait); | |
1613 | ||
1614 | /* | |
1615 | * finally we need to re-initiate requests that may be pending. we will | |
1616 | * have had everything blocked while error handling is taking place, and | |
1617 | * now that error recovery is done, we will need to ensure that these | |
1618 | * requests are started. | |
1619 | */ | |
1620 | scsi_run_host_queues(shost); | |
1621 | } | |
1622 | ||
1623 | /** | |
1624 | * scsi_eh_ready_devs - check device ready state and recover if not. | |
1625 | * @shost: host to be recovered. | |
eb44820c RL |
1626 | * @work_q: &list_head for pending commands. |
1627 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1628 | */ |
dca84e46 DW |
1629 | void scsi_eh_ready_devs(struct Scsi_Host *shost, |
1630 | struct list_head *work_q, | |
1631 | struct list_head *done_q) | |
1da177e4 LT |
1632 | { |
1633 | if (!scsi_eh_stu(shost, work_q, done_q)) | |
1634 | if (!scsi_eh_bus_device_reset(shost, work_q, done_q)) | |
30bd7df8 MC |
1635 | if (!scsi_eh_target_reset(shost, work_q, done_q)) |
1636 | if (!scsi_eh_bus_reset(shost, work_q, done_q)) | |
1637 | if (!scsi_eh_host_reset(work_q, done_q)) | |
1638 | scsi_eh_offline_sdevs(work_q, | |
1639 | done_q); | |
1da177e4 | 1640 | } |
dca84e46 | 1641 | EXPORT_SYMBOL_GPL(scsi_eh_ready_devs); |
1da177e4 LT |
1642 | |
1643 | /** | |
1644 | * scsi_eh_flush_done_q - finish processed commands or retry them. | |
1645 | * @done_q: list_head of processed commands. | |
dc8875e1 | 1646 | */ |
041c5fc3 | 1647 | void scsi_eh_flush_done_q(struct list_head *done_q) |
1da177e4 | 1648 | { |
937abeaa | 1649 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1650 | |
937abeaa CH |
1651 | list_for_each_entry_safe(scmd, next, done_q, eh_entry) { |
1652 | list_del_init(&scmd->eh_entry); | |
1da177e4 | 1653 | if (scsi_device_online(scmd->device) && |
4a27446f | 1654 | !scsi_noretry_cmd(scmd) && |
8884efab | 1655 | (++scmd->retries <= scmd->allowed)) { |
1da177e4 LT |
1656 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush" |
1657 | " retry cmd: %p\n", | |
1658 | current->comm, | |
1659 | scmd)); | |
1660 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); | |
1661 | } else { | |
793698ce PM |
1662 | /* |
1663 | * If just we got sense for the device (called | |
1664 | * scsi_eh_get_sense), scmd->result is already | |
1665 | * set, do not set DRIVER_TIMEOUT. | |
1666 | */ | |
1da177e4 LT |
1667 | if (!scmd->result) |
1668 | scmd->result |= (DRIVER_TIMEOUT << 24); | |
1669 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush finish" | |
1670 | " cmd: %p\n", | |
1671 | current->comm, scmd)); | |
1672 | scsi_finish_command(scmd); | |
1673 | } | |
1674 | } | |
1675 | } | |
041c5fc3 | 1676 | EXPORT_SYMBOL(scsi_eh_flush_done_q); |
1da177e4 LT |
1677 | |
1678 | /** | |
1679 | * scsi_unjam_host - Attempt to fix a host which has a cmd that failed. | |
1680 | * @shost: Host to unjam. | |
1681 | * | |
1682 | * Notes: | |
1683 | * When we come in here, we *know* that all commands on the bus have | |
1684 | * either completed, failed or timed out. we also know that no further | |
1685 | * commands are being sent to the host, so things are relatively quiet | |
1686 | * and we have freedom to fiddle with things as we wish. | |
1687 | * | |
1688 | * This is only the *default* implementation. it is possible for | |
1689 | * individual drivers to supply their own version of this function, and | |
1690 | * if the maintainer wishes to do this, it is strongly suggested that | |
1691 | * this function be taken as a template and modified. this function | |
1692 | * was designed to correctly handle problems for about 95% of the | |
1693 | * different cases out there, and it should always provide at least a | |
1694 | * reasonable amount of error recovery. | |
1695 | * | |
1696 | * Any command marked 'failed' or 'timeout' must eventually have | |
1697 | * scsi_finish_cmd() called for it. we do all of the retry stuff | |
1698 | * here, so when we restart the host after we return it should have an | |
1699 | * empty queue. | |
dc8875e1 | 1700 | */ |
1da177e4 LT |
1701 | static void scsi_unjam_host(struct Scsi_Host *shost) |
1702 | { | |
1703 | unsigned long flags; | |
1704 | LIST_HEAD(eh_work_q); | |
1705 | LIST_HEAD(eh_done_q); | |
1706 | ||
1707 | spin_lock_irqsave(shost->host_lock, flags); | |
1708 | list_splice_init(&shost->eh_cmd_q, &eh_work_q); | |
1709 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1710 | ||
1711 | SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost, &eh_work_q)); | |
1712 | ||
1713 | if (!scsi_eh_get_sense(&eh_work_q, &eh_done_q)) | |
1714 | if (!scsi_eh_abort_cmds(&eh_work_q, &eh_done_q)) | |
1715 | scsi_eh_ready_devs(shost, &eh_work_q, &eh_done_q); | |
1716 | ||
1717 | scsi_eh_flush_done_q(&eh_done_q); | |
1718 | } | |
1719 | ||
1720 | /** | |
ad42eb1b | 1721 | * scsi_error_handler - SCSI error handler thread |
1da177e4 LT |
1722 | * @data: Host for which we are running. |
1723 | * | |
1724 | * Notes: | |
ad42eb1b CH |
1725 | * This is the main error handling loop. This is run as a kernel thread |
1726 | * for every SCSI host and handles all error handling activity. | |
dc8875e1 | 1727 | */ |
1da177e4 LT |
1728 | int scsi_error_handler(void *data) |
1729 | { | |
ad42eb1b | 1730 | struct Scsi_Host *shost = data; |
1da177e4 | 1731 | |
1da177e4 | 1732 | /* |
ad42eb1b CH |
1733 | * We use TASK_INTERRUPTIBLE so that the thread is not |
1734 | * counted against the load average as a running process. | |
1735 | * We never actually get interrupted because kthread_run | |
c03264a7 | 1736 | * disables signal delivery for the created thread. |
1da177e4 | 1737 | */ |
3ed7a470 JB |
1738 | set_current_state(TASK_INTERRUPTIBLE); |
1739 | while (!kthread_should_stop()) { | |
ee7863bc | 1740 | if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) || |
3ed7a470 | 1741 | shost->host_failed != shost->host_busy) { |
ad42eb1b CH |
1742 | SCSI_LOG_ERROR_RECOVERY(1, |
1743 | printk("Error handler scsi_eh_%d sleeping\n", | |
1744 | shost->host_no)); | |
3ed7a470 JB |
1745 | schedule(); |
1746 | set_current_state(TASK_INTERRUPTIBLE); | |
1747 | continue; | |
1748 | } | |
1da177e4 | 1749 | |
3ed7a470 | 1750 | __set_current_state(TASK_RUNNING); |
ad42eb1b CH |
1751 | SCSI_LOG_ERROR_RECOVERY(1, |
1752 | printk("Error handler scsi_eh_%d waking up\n", | |
1753 | shost->host_no)); | |
1da177e4 | 1754 | |
1da177e4 LT |
1755 | /* |
1756 | * We have a host that is failing for some reason. Figure out | |
1757 | * what we need to do to get it up and online again (if we can). | |
1758 | * If we fail, we end up taking the thing offline. | |
1759 | */ | |
bc4f2401 AS |
1760 | if (scsi_autopm_get_host(shost) != 0) { |
1761 | SCSI_LOG_ERROR_RECOVERY(1, | |
1762 | printk(KERN_ERR "Error handler scsi_eh_%d " | |
1763 | "unable to autoresume\n", | |
1764 | shost->host_no)); | |
1765 | continue; | |
1766 | } | |
1767 | ||
9227c33d CH |
1768 | if (shost->transportt->eh_strategy_handler) |
1769 | shost->transportt->eh_strategy_handler(shost); | |
1da177e4 LT |
1770 | else |
1771 | scsi_unjam_host(shost); | |
1772 | ||
1da177e4 LT |
1773 | /* |
1774 | * Note - if the above fails completely, the action is to take | |
1775 | * individual devices offline and flush the queue of any | |
1776 | * outstanding requests that may have been pending. When we | |
1777 | * restart, we restart any I/O to any other devices on the bus | |
1778 | * which are still online. | |
1779 | */ | |
1780 | scsi_restart_operations(shost); | |
bc4f2401 | 1781 | scsi_autopm_put_host(shost); |
3ed7a470 | 1782 | set_current_state(TASK_INTERRUPTIBLE); |
1da177e4 | 1783 | } |
461a0ffb SR |
1784 | __set_current_state(TASK_RUNNING); |
1785 | ||
ad42eb1b CH |
1786 | SCSI_LOG_ERROR_RECOVERY(1, |
1787 | printk("Error handler scsi_eh_%d exiting\n", shost->host_no)); | |
3ed7a470 | 1788 | shost->ehandler = NULL; |
1da177e4 LT |
1789 | return 0; |
1790 | } | |
1791 | ||
1792 | /* | |
1793 | * Function: scsi_report_bus_reset() | |
1794 | * | |
1795 | * Purpose: Utility function used by low-level drivers to report that | |
1796 | * they have observed a bus reset on the bus being handled. | |
1797 | * | |
1798 | * Arguments: shost - Host in question | |
1799 | * channel - channel on which reset was observed. | |
1800 | * | |
1801 | * Returns: Nothing | |
1802 | * | |
1803 | * Lock status: Host lock must be held. | |
1804 | * | |
1805 | * Notes: This only needs to be called if the reset is one which | |
1806 | * originates from an unknown location. Resets originated | |
1807 | * by the mid-level itself don't need to call this, but there | |
1808 | * should be no harm. | |
1809 | * | |
1810 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
1811 | * is properly treated. | |
1812 | */ | |
1813 | void scsi_report_bus_reset(struct Scsi_Host *shost, int channel) | |
1814 | { | |
1815 | struct scsi_device *sdev; | |
1816 | ||
1817 | __shost_for_each_device(sdev, shost) { | |
30bd7df8 MC |
1818 | if (channel == sdev_channel(sdev)) |
1819 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
1820 | } |
1821 | } | |
1822 | EXPORT_SYMBOL(scsi_report_bus_reset); | |
1823 | ||
1824 | /* | |
1825 | * Function: scsi_report_device_reset() | |
1826 | * | |
1827 | * Purpose: Utility function used by low-level drivers to report that | |
1828 | * they have observed a device reset on the device being handled. | |
1829 | * | |
1830 | * Arguments: shost - Host in question | |
1831 | * channel - channel on which reset was observed | |
1832 | * target - target on which reset was observed | |
1833 | * | |
1834 | * Returns: Nothing | |
1835 | * | |
1836 | * Lock status: Host lock must be held | |
1837 | * | |
1838 | * Notes: This only needs to be called if the reset is one which | |
1839 | * originates from an unknown location. Resets originated | |
1840 | * by the mid-level itself don't need to call this, but there | |
1841 | * should be no harm. | |
1842 | * | |
1843 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
1844 | * is properly treated. | |
1845 | */ | |
1846 | void scsi_report_device_reset(struct Scsi_Host *shost, int channel, int target) | |
1847 | { | |
1848 | struct scsi_device *sdev; | |
1849 | ||
1850 | __shost_for_each_device(sdev, shost) { | |
422c0d61 | 1851 | if (channel == sdev_channel(sdev) && |
30bd7df8 MC |
1852 | target == sdev_id(sdev)) |
1853 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
1854 | } |
1855 | } | |
1856 | EXPORT_SYMBOL(scsi_report_device_reset); | |
1857 | ||
1858 | static void | |
1859 | scsi_reset_provider_done_command(struct scsi_cmnd *scmd) | |
1860 | { | |
1861 | } | |
1862 | ||
1863 | /* | |
1864 | * Function: scsi_reset_provider | |
1865 | * | |
1866 | * Purpose: Send requested reset to a bus or device at any phase. | |
1867 | * | |
1868 | * Arguments: device - device to send reset to | |
1869 | * flag - reset type (see scsi.h) | |
1870 | * | |
1871 | * Returns: SUCCESS/FAILURE. | |
1872 | * | |
1873 | * Notes: This is used by the SCSI Generic driver to provide | |
1874 | * Bus/Device reset capability. | |
1875 | */ | |
1876 | int | |
1877 | scsi_reset_provider(struct scsi_device *dev, int flag) | |
1878 | { | |
bc4f2401 | 1879 | struct scsi_cmnd *scmd; |
d7a1bb0a | 1880 | struct Scsi_Host *shost = dev->host; |
1da177e4 | 1881 | struct request req; |
d7a1bb0a | 1882 | unsigned long flags; |
1da177e4 LT |
1883 | int rtn; |
1884 | ||
bc4f2401 AS |
1885 | if (scsi_autopm_get_host(shost) < 0) |
1886 | return FAILED; | |
1887 | ||
1888 | scmd = scsi_get_command(dev, GFP_KERNEL); | |
4f54eec8 | 1889 | blk_rq_init(NULL, &req); |
1da177e4 | 1890 | scmd->request = &req; |
b4edcbca | 1891 | |
64a87b24 BH |
1892 | scmd->cmnd = req.cmd; |
1893 | ||
1da177e4 | 1894 | scmd->scsi_done = scsi_reset_provider_done_command; |
30b0c37b | 1895 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
1da177e4 LT |
1896 | |
1897 | scmd->cmd_len = 0; | |
1898 | ||
1899 | scmd->sc_data_direction = DMA_BIDIRECTIONAL; | |
1da177e4 | 1900 | |
d7a1bb0a JS |
1901 | spin_lock_irqsave(shost->host_lock, flags); |
1902 | shost->tmf_in_progress = 1; | |
1903 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1904 | ||
1da177e4 LT |
1905 | switch (flag) { |
1906 | case SCSI_TRY_RESET_DEVICE: | |
1907 | rtn = scsi_try_bus_device_reset(scmd); | |
1908 | if (rtn == SUCCESS) | |
1909 | break; | |
1910 | /* FALLTHROUGH */ | |
30bd7df8 MC |
1911 | case SCSI_TRY_RESET_TARGET: |
1912 | rtn = scsi_try_target_reset(scmd); | |
1913 | if (rtn == SUCCESS) | |
1914 | break; | |
1915 | /* FALLTHROUGH */ | |
1da177e4 LT |
1916 | case SCSI_TRY_RESET_BUS: |
1917 | rtn = scsi_try_bus_reset(scmd); | |
1918 | if (rtn == SUCCESS) | |
1919 | break; | |
1920 | /* FALLTHROUGH */ | |
1921 | case SCSI_TRY_RESET_HOST: | |
1922 | rtn = scsi_try_host_reset(scmd); | |
1923 | break; | |
1924 | default: | |
1925 | rtn = FAILED; | |
1926 | } | |
1927 | ||
d7a1bb0a JS |
1928 | spin_lock_irqsave(shost->host_lock, flags); |
1929 | shost->tmf_in_progress = 0; | |
1930 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1931 | ||
1932 | /* | |
1933 | * be sure to wake up anyone who was sleeping or had their queue | |
1934 | * suspended while we performed the TMF. | |
1935 | */ | |
1936 | SCSI_LOG_ERROR_RECOVERY(3, | |
1937 | printk("%s: waking up host to restart after TMF\n", | |
cadbd4a5 | 1938 | __func__)); |
d7a1bb0a JS |
1939 | |
1940 | wake_up(&shost->host_wait); | |
1941 | ||
1942 | scsi_run_host_queues(shost); | |
1943 | ||
1da177e4 | 1944 | scsi_next_command(scmd); |
bc4f2401 | 1945 | scsi_autopm_put_host(shost); |
1da177e4 LT |
1946 | return rtn; |
1947 | } | |
1948 | EXPORT_SYMBOL(scsi_reset_provider); | |
1949 | ||
1950 | /** | |
1951 | * scsi_normalize_sense - normalize main elements from either fixed or | |
1952 | * descriptor sense data format into a common format. | |
1953 | * | |
1954 | * @sense_buffer: byte array containing sense data returned by device | |
1955 | * @sb_len: number of valid bytes in sense_buffer | |
1956 | * @sshdr: pointer to instance of structure that common | |
1957 | * elements are written to. | |
1958 | * | |
1959 | * Notes: | |
1960 | * The "main elements" from sense data are: response_code, sense_key, | |
1961 | * asc, ascq and additional_length (only for descriptor format). | |
1962 | * | |
1963 | * Typically this function can be called after a device has | |
1964 | * responded to a SCSI command with the CHECK_CONDITION status. | |
1965 | * | |
1966 | * Return value: | |
1967 | * 1 if valid sense data information found, else 0; | |
dc8875e1 | 1968 | */ |
1da177e4 LT |
1969 | int scsi_normalize_sense(const u8 *sense_buffer, int sb_len, |
1970 | struct scsi_sense_hdr *sshdr) | |
1971 | { | |
33aa687d | 1972 | if (!sense_buffer || !sb_len) |
1da177e4 LT |
1973 | return 0; |
1974 | ||
1975 | memset(sshdr, 0, sizeof(struct scsi_sense_hdr)); | |
1976 | ||
1977 | sshdr->response_code = (sense_buffer[0] & 0x7f); | |
33aa687d JB |
1978 | |
1979 | if (!scsi_sense_valid(sshdr)) | |
1980 | return 0; | |
1981 | ||
1da177e4 LT |
1982 | if (sshdr->response_code >= 0x72) { |
1983 | /* | |
1984 | * descriptor format | |
1985 | */ | |
1986 | if (sb_len > 1) | |
1987 | sshdr->sense_key = (sense_buffer[1] & 0xf); | |
1988 | if (sb_len > 2) | |
1989 | sshdr->asc = sense_buffer[2]; | |
1990 | if (sb_len > 3) | |
1991 | sshdr->ascq = sense_buffer[3]; | |
1992 | if (sb_len > 7) | |
1993 | sshdr->additional_length = sense_buffer[7]; | |
1994 | } else { | |
0bf8c869 | 1995 | /* |
1da177e4 LT |
1996 | * fixed format |
1997 | */ | |
1998 | if (sb_len > 2) | |
1999 | sshdr->sense_key = (sense_buffer[2] & 0xf); | |
2000 | if (sb_len > 7) { | |
2001 | sb_len = (sb_len < (sense_buffer[7] + 8)) ? | |
2002 | sb_len : (sense_buffer[7] + 8); | |
2003 | if (sb_len > 12) | |
2004 | sshdr->asc = sense_buffer[12]; | |
2005 | if (sb_len > 13) | |
2006 | sshdr->ascq = sense_buffer[13]; | |
2007 | } | |
2008 | } | |
2009 | ||
2010 | return 1; | |
2011 | } | |
2012 | EXPORT_SYMBOL(scsi_normalize_sense); | |
2013 | ||
1da177e4 LT |
2014 | int scsi_command_normalize_sense(struct scsi_cmnd *cmd, |
2015 | struct scsi_sense_hdr *sshdr) | |
2016 | { | |
2017 | return scsi_normalize_sense(cmd->sense_buffer, | |
b80ca4f7 | 2018 | SCSI_SENSE_BUFFERSIZE, sshdr); |
1da177e4 LT |
2019 | } |
2020 | EXPORT_SYMBOL(scsi_command_normalize_sense); | |
2021 | ||
2022 | /** | |
eb44820c | 2023 | * scsi_sense_desc_find - search for a given descriptor type in descriptor sense data format. |
1da177e4 LT |
2024 | * @sense_buffer: byte array of descriptor format sense data |
2025 | * @sb_len: number of valid bytes in sense_buffer | |
2026 | * @desc_type: value of descriptor type to find | |
2027 | * (e.g. 0 -> information) | |
2028 | * | |
2029 | * Notes: | |
2030 | * only valid when sense data is in descriptor format | |
2031 | * | |
2032 | * Return value: | |
2033 | * pointer to start of (first) descriptor if found else NULL | |
dc8875e1 | 2034 | */ |
1da177e4 LT |
2035 | const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len, |
2036 | int desc_type) | |
2037 | { | |
2038 | int add_sen_len, add_len, desc_len, k; | |
2039 | const u8 * descp; | |
2040 | ||
2041 | if ((sb_len < 8) || (0 == (add_sen_len = sense_buffer[7]))) | |
2042 | return NULL; | |
2043 | if ((sense_buffer[0] < 0x72) || (sense_buffer[0] > 0x73)) | |
2044 | return NULL; | |
2045 | add_sen_len = (add_sen_len < (sb_len - 8)) ? | |
2046 | add_sen_len : (sb_len - 8); | |
2047 | descp = &sense_buffer[8]; | |
2048 | for (desc_len = 0, k = 0; k < add_sen_len; k += desc_len) { | |
2049 | descp += desc_len; | |
2050 | add_len = (k < (add_sen_len - 1)) ? descp[1]: -1; | |
2051 | desc_len = add_len + 2; | |
2052 | if (descp[0] == desc_type) | |
2053 | return descp; | |
2054 | if (add_len < 0) // short descriptor ?? | |
2055 | break; | |
2056 | } | |
2057 | return NULL; | |
2058 | } | |
2059 | EXPORT_SYMBOL(scsi_sense_desc_find); | |
2060 | ||
2061 | /** | |
eb44820c | 2062 | * scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor format) |
1da177e4 LT |
2063 | * @sense_buffer: byte array of sense data |
2064 | * @sb_len: number of valid bytes in sense_buffer | |
2065 | * @info_out: pointer to 64 integer where 8 or 4 byte information | |
2066 | * field will be placed if found. | |
2067 | * | |
2068 | * Return value: | |
2069 | * 1 if information field found, 0 if not found. | |
dc8875e1 | 2070 | */ |
1da177e4 LT |
2071 | int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len, |
2072 | u64 * info_out) | |
2073 | { | |
2074 | int j; | |
2075 | const u8 * ucp; | |
2076 | u64 ull; | |
2077 | ||
2078 | if (sb_len < 7) | |
2079 | return 0; | |
2080 | switch (sense_buffer[0] & 0x7f) { | |
2081 | case 0x70: | |
2082 | case 0x71: | |
2083 | if (sense_buffer[0] & 0x80) { | |
2084 | *info_out = (sense_buffer[3] << 24) + | |
2085 | (sense_buffer[4] << 16) + | |
2086 | (sense_buffer[5] << 8) + sense_buffer[6]; | |
2087 | return 1; | |
2088 | } else | |
2089 | return 0; | |
2090 | case 0x72: | |
2091 | case 0x73: | |
2092 | ucp = scsi_sense_desc_find(sense_buffer, sb_len, | |
2093 | 0 /* info desc */); | |
2094 | if (ucp && (0xa == ucp[1])) { | |
2095 | ull = 0; | |
2096 | for (j = 0; j < 8; ++j) { | |
2097 | if (j > 0) | |
2098 | ull <<= 8; | |
2099 | ull |= ucp[4 + j]; | |
2100 | } | |
2101 | *info_out = ull; | |
2102 | return 1; | |
2103 | } else | |
2104 | return 0; | |
2105 | default: | |
2106 | return 0; | |
2107 | } | |
2108 | } | |
2109 | EXPORT_SYMBOL(scsi_get_sense_info_fld); | |
3bc6a261 FT |
2110 | |
2111 | /** | |
2112 | * scsi_build_sense_buffer - build sense data in a buffer | |
2113 | * @desc: Sense format (non zero == descriptor format, | |
2114 | * 0 == fixed format) | |
2115 | * @buf: Where to build sense data | |
2116 | * @key: Sense key | |
2117 | * @asc: Additional sense code | |
2118 | * @ascq: Additional sense code qualifier | |
2119 | * | |
2120 | **/ | |
2121 | void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq) | |
2122 | { | |
2123 | if (desc) { | |
2124 | buf[0] = 0x72; /* descriptor, current */ | |
2125 | buf[1] = key; | |
2126 | buf[2] = asc; | |
2127 | buf[3] = ascq; | |
2128 | buf[7] = 0; | |
2129 | } else { | |
2130 | buf[0] = 0x70; /* fixed, current */ | |
2131 | buf[2] = key; | |
2132 | buf[7] = 0xa; | |
2133 | buf[12] = asc; | |
2134 | buf[13] = ascq; | |
2135 | } | |
2136 | } | |
2137 | EXPORT_SYMBOL(scsi_build_sense_buffer); |