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> | |
fc73648a | 28 | #include <linux/jiffies.h> |
1da177e4 LT |
29 | |
30 | #include <scsi/scsi.h> | |
beb40487 | 31 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
32 | #include <scsi/scsi_dbg.h> |
33 | #include <scsi/scsi_device.h> | |
18a4d0a2 | 34 | #include <scsi/scsi_driver.h> |
1da177e4 | 35 | #include <scsi/scsi_eh.h> |
c829c394 | 36 | #include <scsi/scsi_transport.h> |
1da177e4 LT |
37 | #include <scsi/scsi_host.h> |
38 | #include <scsi/scsi_ioctl.h> | |
1da177e4 LT |
39 | |
40 | #include "scsi_priv.h" | |
41 | #include "scsi_logging.h" | |
79ee8304 | 42 | #include "scsi_transport_api.h" |
1da177e4 | 43 | |
bf816235 KT |
44 | #include <trace/events/scsi.h> |
45 | ||
14216561 JB |
46 | static void scsi_eh_done(struct scsi_cmnd *scmd); |
47 | ||
1da177e4 LT |
48 | /* |
49 | * These should *probably* be handled by the host itself. | |
50 | * Since it is allowed to sleep, it probably should. | |
51 | */ | |
52 | #define BUS_RESET_SETTLE_TIME (10) | |
53 | #define HOST_RESET_SETTLE_TIME (10) | |
54 | ||
3eef6257 DJ |
55 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd); |
56 | ||
1da177e4 LT |
57 | /* called with shost->host_lock held */ |
58 | void scsi_eh_wakeup(struct Scsi_Host *shost) | |
59 | { | |
60 | if (shost->host_busy == shost->host_failed) { | |
bf816235 | 61 | trace_scsi_eh_wakeup(shost); |
3ed7a470 | 62 | wake_up_process(shost->ehandler); |
1da177e4 LT |
63 | SCSI_LOG_ERROR_RECOVERY(5, |
64 | printk("Waking error handler thread\n")); | |
65 | } | |
66 | } | |
f8bbfc24 TH |
67 | |
68 | /** | |
69 | * scsi_schedule_eh - schedule EH for SCSI host | |
70 | * @shost: SCSI host to invoke error handling on. | |
71 | * | |
72 | * Schedule SCSI EH without scmd. | |
dc8875e1 | 73 | */ |
f8bbfc24 TH |
74 | void scsi_schedule_eh(struct Scsi_Host *shost) |
75 | { | |
76 | unsigned long flags; | |
77 | ||
78 | spin_lock_irqsave(shost->host_lock, flags); | |
79 | ||
80 | if (scsi_host_set_state(shost, SHOST_RECOVERY) == 0 || | |
81 | scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY) == 0) { | |
82 | shost->host_eh_scheduled++; | |
83 | scsi_eh_wakeup(shost); | |
84 | } | |
85 | ||
86 | spin_unlock_irqrestore(shost->host_lock, flags); | |
87 | } | |
88 | EXPORT_SYMBOL_GPL(scsi_schedule_eh); | |
1da177e4 LT |
89 | |
90 | /** | |
91 | * scsi_eh_scmd_add - add scsi cmd to error handling. | |
92 | * @scmd: scmd to run eh on. | |
93 | * @eh_flag: optional SCSI_EH flag. | |
94 | * | |
95 | * Return value: | |
96 | * 0 on failure. | |
dc8875e1 | 97 | */ |
1da177e4 LT |
98 | int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag) |
99 | { | |
100 | struct Scsi_Host *shost = scmd->device->host; | |
101 | unsigned long flags; | |
939647ee | 102 | int ret = 0; |
1da177e4 | 103 | |
3ed7a470 | 104 | if (!shost->ehandler) |
1da177e4 LT |
105 | return 0; |
106 | ||
107 | spin_lock_irqsave(shost->host_lock, flags); | |
939647ee JB |
108 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) |
109 | if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) | |
110 | goto out_unlock; | |
1da177e4 | 111 | |
939647ee | 112 | ret = 1; |
3111b0d1 | 113 | scmd->eh_eflags |= eh_flag; |
1da177e4 | 114 | list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q); |
1da177e4 LT |
115 | shost->host_failed++; |
116 | scsi_eh_wakeup(shost); | |
939647ee | 117 | out_unlock: |
1da177e4 | 118 | spin_unlock_irqrestore(shost->host_lock, flags); |
939647ee | 119 | return ret; |
1da177e4 LT |
120 | } |
121 | ||
1da177e4 LT |
122 | /** |
123 | * scsi_times_out - Timeout function for normal scsi commands. | |
242f9dcb | 124 | * @req: request that is timing out. |
1da177e4 LT |
125 | * |
126 | * Notes: | |
127 | * We do not need to lock this. There is the potential for a race | |
128 | * only in that the normal completion handling might run, but if the | |
129 | * normal completion function determines that the timer has already | |
130 | * fired, then it mustn't do anything. | |
dc8875e1 | 131 | */ |
242f9dcb | 132 | enum blk_eh_timer_return scsi_times_out(struct request *req) |
1da177e4 | 133 | { |
242f9dcb | 134 | struct scsi_cmnd *scmd = req->special; |
242f9dcb | 135 | enum blk_eh_timer_return rtn = BLK_EH_NOT_HANDLED; |
0bf8c869 | 136 | struct Scsi_Host *host = scmd->device->host; |
6c5f8ce1 | 137 | |
bf816235 | 138 | trace_scsi_dispatch_cmd_timeout(scmd); |
1da177e4 LT |
139 | scsi_log_completion(scmd, TIMEOUT_ERROR); |
140 | ||
0bf8c869 JJ |
141 | if (host->transportt->eh_timed_out) |
142 | rtn = host->transportt->eh_timed_out(scmd); | |
143 | else if (host->hostt->eh_timed_out) | |
144 | rtn = host->hostt->eh_timed_out(scmd); | |
1da177e4 | 145 | |
18a4d0a2 MP |
146 | scmd->result |= DID_TIME_OUT << 16; |
147 | ||
fa990781 | 148 | if (unlikely(rtn == BLK_EH_NOT_HANDLED && |
18a4d0a2 | 149 | !scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD))) |
fa990781 | 150 | rtn = BLK_EH_HANDLED; |
242f9dcb | 151 | |
fa990781 | 152 | return rtn; |
1da177e4 LT |
153 | } |
154 | ||
155 | /** | |
156 | * scsi_block_when_processing_errors - Prevent cmds from being queued. | |
157 | * @sdev: Device on which we are performing recovery. | |
158 | * | |
159 | * Description: | |
160 | * We block until the host is out of error recovery, and then check to | |
161 | * see whether the host or the device is offline. | |
162 | * | |
163 | * Return value: | |
164 | * 0 when dev was taken offline by error recovery. 1 OK to proceed. | |
dc8875e1 | 165 | */ |
1da177e4 LT |
166 | int scsi_block_when_processing_errors(struct scsi_device *sdev) |
167 | { | |
168 | int online; | |
169 | ||
939647ee | 170 | wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host)); |
1da177e4 LT |
171 | |
172 | online = scsi_device_online(sdev); | |
173 | ||
cadbd4a5 | 174 | SCSI_LOG_ERROR_RECOVERY(5, printk("%s: rtn: %d\n", __func__, |
1da177e4 LT |
175 | online)); |
176 | ||
177 | return online; | |
178 | } | |
179 | EXPORT_SYMBOL(scsi_block_when_processing_errors); | |
180 | ||
181 | #ifdef CONFIG_SCSI_LOGGING | |
182 | /** | |
183 | * scsi_eh_prt_fail_stats - Log info on failures. | |
184 | * @shost: scsi host being recovered. | |
185 | * @work_q: Queue of scsi cmds to process. | |
dc8875e1 | 186 | */ |
1da177e4 LT |
187 | static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost, |
188 | struct list_head *work_q) | |
189 | { | |
190 | struct scsi_cmnd *scmd; | |
191 | struct scsi_device *sdev; | |
192 | int total_failures = 0; | |
193 | int cmd_failed = 0; | |
194 | int cmd_cancel = 0; | |
195 | int devices_failed = 0; | |
196 | ||
197 | shost_for_each_device(sdev, shost) { | |
198 | list_for_each_entry(scmd, work_q, eh_entry) { | |
199 | if (scmd->device == sdev) { | |
200 | ++total_failures; | |
3111b0d1 | 201 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) |
1da177e4 | 202 | ++cmd_cancel; |
0bf8c869 | 203 | else |
1da177e4 LT |
204 | ++cmd_failed; |
205 | } | |
206 | } | |
207 | ||
208 | if (cmd_cancel || cmd_failed) { | |
209 | SCSI_LOG_ERROR_RECOVERY(3, | |
9ccfc756 JB |
210 | sdev_printk(KERN_INFO, sdev, |
211 | "%s: cmds failed: %d, cancel: %d\n", | |
cadbd4a5 | 212 | __func__, cmd_failed, |
9ccfc756 | 213 | cmd_cancel)); |
1da177e4 LT |
214 | cmd_cancel = 0; |
215 | cmd_failed = 0; | |
216 | ++devices_failed; | |
217 | } | |
218 | } | |
219 | ||
220 | SCSI_LOG_ERROR_RECOVERY(2, printk("Total of %d commands on %d" | |
221 | " devices require eh work\n", | |
0bf8c869 | 222 | total_failures, devices_failed)); |
1da177e4 LT |
223 | } |
224 | #endif | |
225 | ||
226 | /** | |
227 | * scsi_check_sense - Examine scsi cmd sense | |
228 | * @scmd: Cmd to have sense checked. | |
229 | * | |
230 | * Return value: | |
63583cca | 231 | * SUCCESS or FAILED or NEEDS_RETRY or TARGET_ERROR |
1da177e4 LT |
232 | * |
233 | * Notes: | |
234 | * When a deferred error is detected the current command has | |
235 | * not been executed and needs retrying. | |
dc8875e1 | 236 | */ |
1da177e4 LT |
237 | static int scsi_check_sense(struct scsi_cmnd *scmd) |
238 | { | |
a6a8d9f8 | 239 | struct scsi_device *sdev = scmd->device; |
1da177e4 LT |
240 | struct scsi_sense_hdr sshdr; |
241 | ||
242 | if (! scsi_command_normalize_sense(scmd, &sshdr)) | |
243 | return FAILED; /* no valid sense data */ | |
244 | ||
14216561 JB |
245 | if (scmd->cmnd[0] == TEST_UNIT_READY && scmd->scsi_done != scsi_eh_done) |
246 | /* | |
247 | * nasty: for mid-layer issued TURs, we need to return the | |
248 | * actual sense data without any recovery attempt. For eh | |
249 | * issued ones, we need to try to recover and interpret | |
250 | */ | |
251 | return SUCCESS; | |
252 | ||
1da177e4 LT |
253 | if (scsi_sense_is_deferred(&sshdr)) |
254 | return NEEDS_RETRY; | |
255 | ||
a6a8d9f8 CS |
256 | if (sdev->scsi_dh_data && sdev->scsi_dh_data->scsi_dh && |
257 | sdev->scsi_dh_data->scsi_dh->check_sense) { | |
258 | int rc; | |
259 | ||
260 | rc = sdev->scsi_dh_data->scsi_dh->check_sense(sdev, &sshdr); | |
261 | if (rc != SCSI_RETURN_NOT_HANDLED) | |
262 | return rc; | |
263 | /* handler does not care. Drop down to default handling */ | |
264 | } | |
265 | ||
1da177e4 LT |
266 | /* |
267 | * Previous logic looked for FILEMARK, EOM or ILI which are | |
268 | * mainly associated with tapes and returned SUCCESS. | |
269 | */ | |
270 | if (sshdr.response_code == 0x70) { | |
271 | /* fixed format */ | |
272 | if (scmd->sense_buffer[2] & 0xe0) | |
273 | return SUCCESS; | |
274 | } else { | |
275 | /* | |
276 | * descriptor format: look for "stream commands sense data | |
277 | * descriptor" (see SSC-3). Assume single sense data | |
278 | * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG. | |
279 | */ | |
280 | if ((sshdr.additional_length > 3) && | |
281 | (scmd->sense_buffer[8] == 0x4) && | |
282 | (scmd->sense_buffer[11] & 0xe0)) | |
283 | return SUCCESS; | |
284 | } | |
285 | ||
286 | switch (sshdr.sense_key) { | |
287 | case NO_SENSE: | |
288 | return SUCCESS; | |
289 | case RECOVERED_ERROR: | |
290 | return /* soft_error */ SUCCESS; | |
291 | ||
292 | case ABORTED_COMMAND: | |
511e44f4 MP |
293 | if (sshdr.asc == 0x10) /* DIF */ |
294 | return SUCCESS; | |
295 | ||
1da177e4 LT |
296 | return NEEDS_RETRY; |
297 | case NOT_READY: | |
298 | case UNIT_ATTENTION: | |
299 | /* | |
300 | * if we are expecting a cc/ua because of a bus reset that we | |
301 | * performed, treat this just as a retry. otherwise this is | |
302 | * information that we should pass up to the upper-level driver | |
303 | * so that we can deal with it there. | |
304 | */ | |
305 | if (scmd->device->expecting_cc_ua) { | |
dfcf7775 TH |
306 | /* |
307 | * Because some device does not queue unit | |
308 | * attentions correctly, we carefully check | |
309 | * additional sense code and qualifier so as | |
310 | * not to squash media change unit attention. | |
311 | */ | |
312 | if (sshdr.asc != 0x28 || sshdr.ascq != 0x00) { | |
313 | scmd->device->expecting_cc_ua = 0; | |
314 | return NEEDS_RETRY; | |
315 | } | |
1da177e4 LT |
316 | } |
317 | /* | |
0bf8c869 | 318 | * if the device is in the process of becoming ready, we |
1da177e4 LT |
319 | * should retry. |
320 | */ | |
321 | if ((sshdr.asc == 0x04) && (sshdr.ascq == 0x01)) | |
322 | return NEEDS_RETRY; | |
323 | /* | |
324 | * if the device is not started, we need to wake | |
325 | * the error handler to start the motor | |
326 | */ | |
327 | if (scmd->device->allow_restart && | |
328 | (sshdr.asc == 0x04) && (sshdr.ascq == 0x02)) | |
329 | return FAILED; | |
77a42297 | 330 | |
6e49949c MC |
331 | if (sshdr.asc == 0x3f && sshdr.ascq == 0x0e) |
332 | scmd_printk(KERN_WARNING, scmd, | |
333 | "Warning! Received an indication that the " | |
334 | "LUN assignments on this target have " | |
335 | "changed. The Linux SCSI layer does not " | |
336 | "automatically remap LUN assignments.\n"); | |
337 | else if (sshdr.asc == 0x3f) | |
338 | scmd_printk(KERN_WARNING, scmd, | |
339 | "Warning! Received an indication that the " | |
340 | "operating parameters on this target have " | |
341 | "changed. The Linux SCSI layer does not " | |
342 | "automatically adjust these parameters.\n"); | |
343 | ||
deb1cb63 SI |
344 | if (sshdr.asc == 0x38 && sshdr.ascq == 0x07) |
345 | scmd_printk(KERN_WARNING, scmd, | |
346 | "Warning! Received an indication that the " | |
347 | "LUN reached a thin provisioning soft " | |
348 | "threshold.\n"); | |
349 | ||
02e031cb CH |
350 | /* |
351 | * Pass the UA upwards for a determination in the completion | |
352 | * functions. | |
353 | */ | |
354 | return SUCCESS; | |
1da177e4 | 355 | |
63583cca | 356 | /* these are not supported */ |
1da177e4 LT |
357 | case COPY_ABORTED: |
358 | case VOLUME_OVERFLOW: | |
359 | case MISCOMPARE: | |
63583cca HR |
360 | case BLANK_CHECK: |
361 | case DATA_PROTECT: | |
362 | return TARGET_ERROR; | |
1da177e4 LT |
363 | |
364 | case MEDIUM_ERROR: | |
fd1b494d LT |
365 | if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */ |
366 | sshdr.asc == 0x13 || /* AMNF DATA FIELD */ | |
367 | sshdr.asc == 0x14) { /* RECORD NOT FOUND */ | |
63583cca | 368 | return TARGET_ERROR; |
fd1b494d | 369 | } |
1da177e4 LT |
370 | return NEEDS_RETRY; |
371 | ||
372 | case HARDWARE_ERROR: | |
373 | if (scmd->device->retry_hwerror) | |
bb0003c1 | 374 | return ADD_TO_MLQUEUE; |
1da177e4 | 375 | else |
63583cca | 376 | return TARGET_ERROR; |
1da177e4 LT |
377 | |
378 | case ILLEGAL_REQUEST: | |
47ac56db MS |
379 | if (sshdr.asc == 0x20 || /* Invalid command operation code */ |
380 | sshdr.asc == 0x21 || /* Logical block address out of range */ | |
381 | sshdr.asc == 0x24 || /* Invalid field in cdb */ | |
382 | sshdr.asc == 0x26) { /* Parameter value invalid */ | |
383 | return TARGET_ERROR; | |
384 | } | |
385 | return SUCCESS; | |
386 | ||
1da177e4 LT |
387 | default: |
388 | return SUCCESS; | |
389 | } | |
390 | } | |
391 | ||
4a84067d VD |
392 | static void scsi_handle_queue_ramp_up(struct scsi_device *sdev) |
393 | { | |
394 | struct scsi_host_template *sht = sdev->host->hostt; | |
395 | struct scsi_device *tmp_sdev; | |
396 | ||
397 | if (!sht->change_queue_depth || | |
398 | sdev->queue_depth >= sdev->max_queue_depth) | |
399 | return; | |
400 | ||
401 | if (time_before(jiffies, | |
402 | sdev->last_queue_ramp_up + sdev->queue_ramp_up_period)) | |
403 | return; | |
404 | ||
405 | if (time_before(jiffies, | |
406 | sdev->last_queue_full_time + sdev->queue_ramp_up_period)) | |
407 | return; | |
408 | ||
409 | /* | |
410 | * Walk all devices of a target and do | |
411 | * ramp up on them. | |
412 | */ | |
413 | shost_for_each_device(tmp_sdev, sdev->host) { | |
414 | if (tmp_sdev->channel != sdev->channel || | |
415 | tmp_sdev->id != sdev->id || | |
416 | tmp_sdev->queue_depth == sdev->max_queue_depth) | |
417 | continue; | |
418 | /* | |
419 | * call back into LLD to increase queue_depth by one | |
420 | * with ramp up reason code. | |
421 | */ | |
422 | sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1, | |
423 | SCSI_QDEPTH_RAMP_UP); | |
424 | sdev->last_queue_ramp_up = jiffies; | |
425 | } | |
426 | } | |
427 | ||
42a6a918 MC |
428 | static void scsi_handle_queue_full(struct scsi_device *sdev) |
429 | { | |
430 | struct scsi_host_template *sht = sdev->host->hostt; | |
431 | struct scsi_device *tmp_sdev; | |
432 | ||
433 | if (!sht->change_queue_depth) | |
434 | return; | |
435 | ||
436 | shost_for_each_device(tmp_sdev, sdev->host) { | |
437 | if (tmp_sdev->channel != sdev->channel || | |
438 | tmp_sdev->id != sdev->id) | |
439 | continue; | |
440 | /* | |
441 | * We do not know the number of commands that were at | |
442 | * the device when we got the queue full so we start | |
443 | * from the highest possible value and work our way down. | |
444 | */ | |
445 | sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth - 1, | |
446 | SCSI_QDEPTH_QFULL); | |
447 | } | |
448 | } | |
449 | ||
1da177e4 LT |
450 | /** |
451 | * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD. | |
452 | * @scmd: SCSI cmd to examine. | |
453 | * | |
454 | * Notes: | |
455 | * This is *only* called when we are examining the status of commands | |
456 | * queued during error recovery. the main difference here is that we | |
457 | * don't allow for the possibility of retries here, and we are a lot | |
458 | * more restrictive about what we consider acceptable. | |
dc8875e1 | 459 | */ |
1da177e4 LT |
460 | static int scsi_eh_completed_normally(struct scsi_cmnd *scmd) |
461 | { | |
462 | /* | |
463 | * first check the host byte, to see if there is anything in there | |
464 | * that would indicate what we need to do. | |
465 | */ | |
466 | if (host_byte(scmd->result) == DID_RESET) { | |
467 | /* | |
468 | * rats. we are already in the error handler, so we now | |
469 | * get to try and figure out what to do next. if the sense | |
470 | * is valid, we have a pretty good idea of what to do. | |
471 | * if not, we mark it as FAILED. | |
472 | */ | |
473 | return scsi_check_sense(scmd); | |
474 | } | |
475 | if (host_byte(scmd->result) != DID_OK) | |
476 | return FAILED; | |
477 | ||
478 | /* | |
479 | * next, check the message byte. | |
480 | */ | |
481 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
482 | return FAILED; | |
483 | ||
484 | /* | |
485 | * now, check the status byte to see if this indicates | |
486 | * anything special. | |
487 | */ | |
488 | switch (status_byte(scmd->result)) { | |
489 | case GOOD: | |
4a84067d | 490 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 LT |
491 | case COMMAND_TERMINATED: |
492 | return SUCCESS; | |
493 | case CHECK_CONDITION: | |
494 | return scsi_check_sense(scmd); | |
495 | case CONDITION_GOOD: | |
496 | case INTERMEDIATE_GOOD: | |
497 | case INTERMEDIATE_C_GOOD: | |
498 | /* | |
499 | * who knows? FIXME(eric) | |
500 | */ | |
501 | return SUCCESS; | |
5f91bb05 | 502 | case RESERVATION_CONFLICT: |
67110dfd JB |
503 | if (scmd->cmnd[0] == TEST_UNIT_READY) |
504 | /* it is a success, we probed the device and | |
505 | * found it */ | |
506 | return SUCCESS; | |
507 | /* otherwise, we failed to send the command */ | |
508 | return FAILED; | |
1da177e4 | 509 | case QUEUE_FULL: |
42a6a918 MC |
510 | scsi_handle_queue_full(scmd->device); |
511 | /* fall through */ | |
512 | case BUSY: | |
3eb3a928 | 513 | return NEEDS_RETRY; |
1da177e4 LT |
514 | default: |
515 | return FAILED; | |
516 | } | |
517 | return FAILED; | |
518 | } | |
519 | ||
1da177e4 LT |
520 | /** |
521 | * scsi_eh_done - Completion function for error handling. | |
522 | * @scmd: Cmd that is done. | |
dc8875e1 | 523 | */ |
1da177e4 LT |
524 | static void scsi_eh_done(struct scsi_cmnd *scmd) |
525 | { | |
0bf8c869 | 526 | struct completion *eh_action; |
85631672 | 527 | |
7dfdc9a5 CH |
528 | SCSI_LOG_ERROR_RECOVERY(3, |
529 | printk("%s scmd: %p result: %x\n", | |
cadbd4a5 | 530 | __func__, scmd, scmd->result)); |
85631672 MR |
531 | |
532 | eh_action = scmd->device->host->eh_action; | |
533 | if (eh_action) | |
534 | complete(eh_action); | |
1da177e4 LT |
535 | } |
536 | ||
292148f8 BK |
537 | /** |
538 | * scsi_try_host_reset - ask host adapter to reset itself | |
c2b3ebd0 | 539 | * @scmd: SCSI cmd to send host reset. |
dc8875e1 | 540 | */ |
292148f8 BK |
541 | static int scsi_try_host_reset(struct scsi_cmnd *scmd) |
542 | { | |
543 | unsigned long flags; | |
544 | int rtn; | |
0bf8c869 JJ |
545 | struct Scsi_Host *host = scmd->device->host; |
546 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 BK |
547 | |
548 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Host RST\n", | |
cadbd4a5 | 549 | __func__)); |
292148f8 | 550 | |
0bf8c869 | 551 | if (!hostt->eh_host_reset_handler) |
292148f8 BK |
552 | return FAILED; |
553 | ||
0bf8c869 | 554 | rtn = hostt->eh_host_reset_handler(scmd); |
292148f8 BK |
555 | |
556 | if (rtn == SUCCESS) { | |
0bf8c869 | 557 | if (!hostt->skip_settle_delay) |
292148f8 | 558 | ssleep(HOST_RESET_SETTLE_TIME); |
0bf8c869 JJ |
559 | spin_lock_irqsave(host->host_lock, flags); |
560 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
561 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
562 | } |
563 | ||
564 | return rtn; | |
565 | } | |
566 | ||
567 | /** | |
568 | * scsi_try_bus_reset - ask host to perform a bus reset | |
569 | * @scmd: SCSI cmd to send bus reset. | |
dc8875e1 | 570 | */ |
292148f8 BK |
571 | static int scsi_try_bus_reset(struct scsi_cmnd *scmd) |
572 | { | |
573 | unsigned long flags; | |
574 | int rtn; | |
0bf8c869 JJ |
575 | struct Scsi_Host *host = scmd->device->host; |
576 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 BK |
577 | |
578 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Bus RST\n", | |
cadbd4a5 | 579 | __func__)); |
292148f8 | 580 | |
0bf8c869 | 581 | if (!hostt->eh_bus_reset_handler) |
292148f8 BK |
582 | return FAILED; |
583 | ||
0bf8c869 | 584 | rtn = hostt->eh_bus_reset_handler(scmd); |
292148f8 BK |
585 | |
586 | if (rtn == SUCCESS) { | |
0bf8c869 | 587 | if (!hostt->skip_settle_delay) |
292148f8 | 588 | ssleep(BUS_RESET_SETTLE_TIME); |
0bf8c869 JJ |
589 | spin_lock_irqsave(host->host_lock, flags); |
590 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
591 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
592 | } |
593 | ||
594 | return rtn; | |
595 | } | |
596 | ||
30bd7df8 MC |
597 | static void __scsi_report_device_reset(struct scsi_device *sdev, void *data) |
598 | { | |
599 | sdev->was_reset = 1; | |
600 | sdev->expecting_cc_ua = 1; | |
601 | } | |
602 | ||
603 | /** | |
604 | * scsi_try_target_reset - Ask host to perform a target reset | |
605 | * @scmd: SCSI cmd used to send a target reset | |
606 | * | |
607 | * Notes: | |
608 | * There is no timeout for this operation. if this operation is | |
609 | * unreliable for a given host, then the host itself needs to put a | |
610 | * timer on it, and set the host back to a consistent state prior to | |
611 | * returning. | |
612 | */ | |
613 | static int scsi_try_target_reset(struct scsi_cmnd *scmd) | |
614 | { | |
615 | unsigned long flags; | |
616 | int rtn; | |
0bf8c869 JJ |
617 | struct Scsi_Host *host = scmd->device->host; |
618 | struct scsi_host_template *hostt = host->hostt; | |
30bd7df8 | 619 | |
0bf8c869 | 620 | if (!hostt->eh_target_reset_handler) |
30bd7df8 MC |
621 | return FAILED; |
622 | ||
0bf8c869 | 623 | rtn = hostt->eh_target_reset_handler(scmd); |
30bd7df8 | 624 | if (rtn == SUCCESS) { |
0bf8c869 | 625 | spin_lock_irqsave(host->host_lock, flags); |
30bd7df8 MC |
626 | __starget_for_each_device(scsi_target(scmd->device), NULL, |
627 | __scsi_report_device_reset); | |
0bf8c869 | 628 | spin_unlock_irqrestore(host->host_lock, flags); |
30bd7df8 MC |
629 | } |
630 | ||
631 | return rtn; | |
632 | } | |
633 | ||
292148f8 BK |
634 | /** |
635 | * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev | |
636 | * @scmd: SCSI cmd used to send BDR | |
637 | * | |
638 | * Notes: | |
639 | * There is no timeout for this operation. if this operation is | |
640 | * unreliable for a given host, then the host itself needs to put a | |
641 | * timer on it, and set the host back to a consistent state prior to | |
642 | * returning. | |
dc8875e1 | 643 | */ |
292148f8 BK |
644 | static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd) |
645 | { | |
646 | int rtn; | |
0bf8c869 | 647 | struct scsi_host_template *hostt = scmd->device->host->hostt; |
292148f8 | 648 | |
0bf8c869 | 649 | if (!hostt->eh_device_reset_handler) |
292148f8 BK |
650 | return FAILED; |
651 | ||
0bf8c869 | 652 | rtn = hostt->eh_device_reset_handler(scmd); |
30bd7df8 MC |
653 | if (rtn == SUCCESS) |
654 | __scsi_report_device_reset(scmd->device, NULL); | |
292148f8 BK |
655 | return rtn; |
656 | } | |
657 | ||
0bf8c869 | 658 | static int scsi_try_to_abort_cmd(struct scsi_host_template *hostt, struct scsi_cmnd *scmd) |
292148f8 | 659 | { |
0bf8c869 | 660 | if (!hostt->eh_abort_handler) |
292148f8 BK |
661 | return FAILED; |
662 | ||
0bf8c869 | 663 | return hostt->eh_abort_handler(scmd); |
292148f8 BK |
664 | } |
665 | ||
292148f8 BK |
666 | static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd) |
667 | { | |
0bf8c869 | 668 | if (scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd) != SUCCESS) |
292148f8 | 669 | if (scsi_try_bus_device_reset(scmd) != SUCCESS) |
30bd7df8 MC |
670 | if (scsi_try_target_reset(scmd) != SUCCESS) |
671 | if (scsi_try_bus_reset(scmd) != SUCCESS) | |
672 | scsi_try_host_reset(scmd); | |
292148f8 BK |
673 | } |
674 | ||
1da177e4 | 675 | /** |
3b729f76 | 676 | * scsi_eh_prep_cmnd - Save a scsi command info as part of error recovery |
2dc611de | 677 | * @scmd: SCSI command structure to hijack |
e1c23468 | 678 | * @ses: structure to save restore information |
55db6c1b | 679 | * @cmnd: CDB to send. Can be NULL if no new cmnd is needed |
64a87b24 | 680 | * @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB) |
55db6c1b | 681 | * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored) |
2dc611de | 682 | * |
e1c23468 | 683 | * This function is used to save a scsi command information before re-execution |
55db6c1b BH |
684 | * as part of the error recovery process. If @sense_bytes is 0 the command |
685 | * sent must be one that does not transfer any data. If @sense_bytes != 0 | |
686 | * @cmnd is ignored and this functions sets up a REQUEST_SENSE command | |
687 | * and cmnd buffers to read @sense_bytes into @scmd->sense_buffer. | |
dc8875e1 | 688 | */ |
e1c23468 BH |
689 | void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, |
690 | unsigned char *cmnd, int cmnd_size, unsigned sense_bytes) | |
1da177e4 | 691 | { |
f59114b7 | 692 | struct scsi_device *sdev = scmd->device; |
1da177e4 | 693 | |
631c228c CH |
694 | /* |
695 | * We need saved copies of a number of fields - this is because | |
696 | * error handling may need to overwrite these with different values | |
697 | * to run different commands, and once error handling is complete, | |
698 | * we will need to restore these values prior to running the actual | |
699 | * command. | |
700 | */ | |
e1c23468 | 701 | ses->cmd_len = scmd->cmd_len; |
64a87b24 | 702 | ses->cmnd = scmd->cmnd; |
e1c23468 | 703 | ses->data_direction = scmd->sc_data_direction; |
30b0c37b | 704 | ses->sdb = scmd->sdb; |
6f9a35e2 | 705 | ses->next_rq = scmd->request->next_rq; |
e1c23468 | 706 | ses->result = scmd->result; |
12265709 | 707 | ses->underflow = scmd->underflow; |
db007fc5 | 708 | ses->prot_op = scmd->prot_op; |
631c228c | 709 | |
db007fc5 | 710 | scmd->prot_op = SCSI_PROT_NORMAL; |
64a87b24 BH |
711 | scmd->cmnd = ses->eh_cmnd; |
712 | memset(scmd->cmnd, 0, BLK_MAX_CDB); | |
30b0c37b | 713 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
6f9a35e2 | 714 | scmd->request->next_rq = NULL; |
30b0c37b | 715 | |
55db6c1b | 716 | if (sense_bytes) { |
30b0c37b BH |
717 | scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE, |
718 | sense_bytes); | |
e1c23468 | 719 | sg_init_one(&ses->sense_sgl, scmd->sense_buffer, |
30b0c37b BH |
720 | scmd->sdb.length); |
721 | scmd->sdb.table.sgl = &ses->sense_sgl; | |
55db6c1b | 722 | scmd->sc_data_direction = DMA_FROM_DEVICE; |
30b0c37b | 723 | scmd->sdb.table.nents = 1; |
55db6c1b | 724 | scmd->cmnd[0] = REQUEST_SENSE; |
30b0c37b | 725 | scmd->cmnd[4] = scmd->sdb.length; |
55db6c1b | 726 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); |
631c228c | 727 | } else { |
631c228c | 728 | scmd->sc_data_direction = DMA_NONE; |
55db6c1b | 729 | if (cmnd) { |
64a87b24 | 730 | BUG_ON(cmnd_size > BLK_MAX_CDB); |
55db6c1b BH |
731 | memcpy(scmd->cmnd, cmnd, cmnd_size); |
732 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); | |
733 | } | |
631c228c CH |
734 | } |
735 | ||
736 | scmd->underflow = 0; | |
631c228c | 737 | |
55db6c1b | 738 | if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN) |
1da177e4 | 739 | scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) | |
f59114b7 | 740 | (sdev->lun << 5 & 0xe0); |
1da177e4 | 741 | |
631c228c CH |
742 | /* |
743 | * Zero the sense buffer. The scsi spec mandates that any | |
744 | * untransferred sense data should be interpreted as being zero. | |
745 | */ | |
b80ca4f7 | 746 | memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); |
e1c23468 BH |
747 | } |
748 | EXPORT_SYMBOL(scsi_eh_prep_cmnd); | |
749 | ||
750 | /** | |
3b729f76 | 751 | * scsi_eh_restore_cmnd - Restore a scsi command info as part of error recovery |
e1c23468 | 752 | * @scmd: SCSI command structure to restore |
477e608c | 753 | * @ses: saved information from a coresponding call to scsi_eh_prep_cmnd |
e1c23468 | 754 | * |
477e608c | 755 | * Undo any damage done by above scsi_eh_prep_cmnd(). |
dc8875e1 | 756 | */ |
e1c23468 BH |
757 | void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses) |
758 | { | |
759 | /* | |
760 | * Restore original data | |
761 | */ | |
762 | scmd->cmd_len = ses->cmd_len; | |
64a87b24 | 763 | scmd->cmnd = ses->cmnd; |
e1c23468 | 764 | scmd->sc_data_direction = ses->data_direction; |
30b0c37b | 765 | scmd->sdb = ses->sdb; |
6f9a35e2 | 766 | scmd->request->next_rq = ses->next_rq; |
e1c23468 | 767 | scmd->result = ses->result; |
12265709 | 768 | scmd->underflow = ses->underflow; |
db007fc5 | 769 | scmd->prot_op = ses->prot_op; |
e1c23468 BH |
770 | } |
771 | EXPORT_SYMBOL(scsi_eh_restore_cmnd); | |
631c228c | 772 | |
e1c23468 | 773 | /** |
3b729f76 | 774 | * scsi_send_eh_cmnd - submit a scsi command as part of error recovery |
e1c23468 BH |
775 | * @scmd: SCSI command structure to hijack |
776 | * @cmnd: CDB to send | |
777 | * @cmnd_size: size in bytes of @cmnd | |
778 | * @timeout: timeout for this request | |
779 | * @sense_bytes: size of sense data to copy or 0 | |
780 | * | |
781 | * This function is used to send a scsi command down to a target device | |
782 | * as part of the error recovery process. See also scsi_eh_prep_cmnd() above. | |
783 | * | |
784 | * Return value: | |
785 | * SUCCESS or FAILED or NEEDS_RETRY | |
dc8875e1 | 786 | */ |
e1c23468 BH |
787 | static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd, |
788 | int cmnd_size, int timeout, unsigned sense_bytes) | |
789 | { | |
790 | struct scsi_device *sdev = scmd->device; | |
791 | struct Scsi_Host *shost = sdev->host; | |
792 | DECLARE_COMPLETION_ONSTACK(done); | |
fc73648a | 793 | unsigned long timeleft = timeout; |
e1c23468 | 794 | struct scsi_eh_save ses; |
fc73648a | 795 | const unsigned long stall_for = msecs_to_jiffies(100); |
e1c23468 BH |
796 | int rtn; |
797 | ||
fc73648a | 798 | retry: |
e1c23468 | 799 | scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes); |
7dfdc9a5 | 800 | shost->eh_action = &done; |
1da177e4 | 801 | |
1da177e4 | 802 | scsi_log_send(scmd); |
f281233d | 803 | scmd->scsi_done = scsi_eh_done; |
fc73648a HR |
804 | rtn = shost->hostt->queuecommand(shost, scmd); |
805 | if (rtn) { | |
806 | if (timeleft > stall_for) { | |
807 | scsi_eh_restore_cmnd(scmd, &ses); | |
808 | timeleft -= stall_for; | |
809 | msleep(jiffies_to_msecs(stall_for)); | |
810 | goto retry; | |
811 | } | |
812 | /* signal not to enter either branch of the if () below */ | |
813 | timeleft = 0; | |
814 | rtn = NEEDS_RETRY; | |
815 | } else { | |
816 | timeleft = wait_for_completion_timeout(&done, timeout); | |
817 | } | |
1da177e4 | 818 | |
f59114b7 | 819 | shost->eh_action = NULL; |
1da177e4 | 820 | |
fc73648a | 821 | scsi_log_completion(scmd, rtn); |
1da177e4 | 822 | |
7dfdc9a5 CH |
823 | SCSI_LOG_ERROR_RECOVERY(3, |
824 | printk("%s: scmd: %p, timeleft: %ld\n", | |
cadbd4a5 | 825 | __func__, scmd, timeleft)); |
1da177e4 LT |
826 | |
827 | /* | |
fc73648a HR |
828 | * If there is time left scsi_eh_done got called, and we will examine |
829 | * the actual status codes to see whether the command actually did | |
830 | * complete normally, else if we have a zero return and no time left, | |
831 | * the command must still be pending, so abort it and return FAILED. | |
832 | * If we never actually managed to issue the command, because | |
833 | * ->queuecommand() kept returning non zero, use the rtn = FAILED | |
834 | * value above (so don't execute either branch of the if) | |
1da177e4 | 835 | */ |
7dfdc9a5 | 836 | if (timeleft) { |
1da177e4 LT |
837 | rtn = scsi_eh_completed_normally(scmd); |
838 | SCSI_LOG_ERROR_RECOVERY(3, | |
839 | printk("%s: scsi_eh_completed_normally %x\n", | |
cadbd4a5 | 840 | __func__, rtn)); |
7dfdc9a5 | 841 | |
1da177e4 LT |
842 | switch (rtn) { |
843 | case SUCCESS: | |
844 | case NEEDS_RETRY: | |
845 | case FAILED: | |
63583cca | 846 | case TARGET_ERROR: |
1da177e4 | 847 | break; |
6e883b0e HR |
848 | case ADD_TO_MLQUEUE: |
849 | rtn = NEEDS_RETRY; | |
850 | break; | |
1da177e4 LT |
851 | default: |
852 | rtn = FAILED; | |
853 | break; | |
854 | } | |
fc73648a | 855 | } else if (!rtn) { |
292148f8 | 856 | scsi_abort_eh_cmnd(scmd); |
7dfdc9a5 | 857 | rtn = FAILED; |
1da177e4 LT |
858 | } |
859 | ||
e1c23468 | 860 | scsi_eh_restore_cmnd(scmd, &ses); |
18a4d0a2 | 861 | |
329a402c LZ |
862 | if (scmd->request->cmd_type != REQ_TYPE_BLOCK_PC) { |
863 | struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd); | |
864 | if (sdrv->eh_action) | |
865 | rtn = sdrv->eh_action(scmd, cmnd, cmnd_size, rtn); | |
866 | } | |
18a4d0a2 | 867 | |
1da177e4 LT |
868 | return rtn; |
869 | } | |
870 | ||
871 | /** | |
872 | * scsi_request_sense - Request sense data from a particular target. | |
873 | * @scmd: SCSI cmd for request sense. | |
874 | * | |
875 | * Notes: | |
876 | * Some hosts automatically obtain this information, others require | |
877 | * that we obtain it on our own. This function will *not* return until | |
878 | * the command either times out, or it completes. | |
dc8875e1 | 879 | */ |
1da177e4 LT |
880 | static int scsi_request_sense(struct scsi_cmnd *scmd) |
881 | { | |
0816c925 | 882 | return scsi_send_eh_cmnd(scmd, NULL, 0, scmd->device->eh_timeout, ~0); |
1da177e4 LT |
883 | } |
884 | ||
885 | /** | |
886 | * scsi_eh_finish_cmd - Handle a cmd that eh is finished with. | |
887 | * @scmd: Original SCSI cmd that eh has finished. | |
888 | * @done_q: Queue for processed commands. | |
889 | * | |
890 | * Notes: | |
891 | * We don't want to use the normal command completion while we are are | |
892 | * still handling errors - it may cause other commands to be queued, | |
eb44820c | 893 | * and that would disturb what we are doing. Thus we really want to |
1da177e4 LT |
894 | * keep a list of pending commands for final completion, and once we |
895 | * are ready to leave error handling we handle completion for real. | |
dc8875e1 | 896 | */ |
041c5fc3 | 897 | void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q) |
1da177e4 LT |
898 | { |
899 | scmd->device->host->host_failed--; | |
3111b0d1 | 900 | scmd->eh_eflags = 0; |
1da177e4 LT |
901 | list_move_tail(&scmd->eh_entry, done_q); |
902 | } | |
041c5fc3 | 903 | EXPORT_SYMBOL(scsi_eh_finish_cmd); |
1da177e4 LT |
904 | |
905 | /** | |
906 | * scsi_eh_get_sense - Get device sense data. | |
907 | * @work_q: Queue of commands to process. | |
eb44820c | 908 | * @done_q: Queue of processed commands. |
1da177e4 LT |
909 | * |
910 | * Description: | |
911 | * See if we need to request sense information. if so, then get it | |
0bf8c869 | 912 | * now, so we have a better idea of what to do. |
1da177e4 LT |
913 | * |
914 | * Notes: | |
915 | * This has the unfortunate side effect that if a shost adapter does | |
eb44820c | 916 | * not automatically request sense information, we end up shutting |
1da177e4 LT |
917 | * it down before we request it. |
918 | * | |
919 | * All drivers should request sense information internally these days, | |
920 | * so for now all I have to say is tough noogies if you end up in here. | |
921 | * | |
922 | * XXX: Long term this code should go away, but that needs an audit of | |
923 | * all LLDDs first. | |
dc8875e1 | 924 | */ |
dca84e46 DW |
925 | int scsi_eh_get_sense(struct list_head *work_q, |
926 | struct list_head *done_q) | |
1da177e4 | 927 | { |
937abeaa | 928 | struct scsi_cmnd *scmd, *next; |
1da177e4 LT |
929 | int rtn; |
930 | ||
937abeaa | 931 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 932 | if ((scmd->eh_eflags & SCSI_EH_CANCEL_CMD) || |
1da177e4 LT |
933 | SCSI_SENSE_VALID(scmd)) |
934 | continue; | |
935 | ||
3bf743e7 JG |
936 | SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd, |
937 | "%s: requesting sense\n", | |
938 | current->comm)); | |
1da177e4 LT |
939 | rtn = scsi_request_sense(scmd); |
940 | if (rtn != SUCCESS) | |
941 | continue; | |
942 | ||
943 | SCSI_LOG_ERROR_RECOVERY(3, printk("sense requested for %p" | |
944 | " result %x\n", scmd, | |
945 | scmd->result)); | |
946 | SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense("bh", scmd)); | |
947 | ||
948 | rtn = scsi_decide_disposition(scmd); | |
949 | ||
950 | /* | |
951 | * if the result was normal, then just pass it along to the | |
952 | * upper level. | |
953 | */ | |
954 | if (rtn == SUCCESS) | |
955 | /* we don't want this command reissued, just | |
956 | * finished with the sense data, so set | |
957 | * retries to the max allowed to ensure it | |
958 | * won't get reissued */ | |
959 | scmd->retries = scmd->allowed; | |
960 | else if (rtn != NEEDS_RETRY) | |
961 | continue; | |
962 | ||
963 | scsi_eh_finish_cmd(scmd, done_q); | |
964 | } | |
965 | ||
966 | return list_empty(work_q); | |
967 | } | |
dca84e46 | 968 | EXPORT_SYMBOL_GPL(scsi_eh_get_sense); |
1da177e4 | 969 | |
1da177e4 LT |
970 | /** |
971 | * scsi_eh_tur - Send TUR to device. | |
eb44820c | 972 | * @scmd: &scsi_cmnd to send TUR |
1da177e4 LT |
973 | * |
974 | * Return value: | |
975 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 976 | */ |
1da177e4 LT |
977 | static int scsi_eh_tur(struct scsi_cmnd *scmd) |
978 | { | |
979 | static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0}; | |
980 | int retry_cnt = 1, rtn; | |
981 | ||
982 | retry_tur: | |
0816c925 MP |
983 | rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, |
984 | scmd->device->eh_timeout, 0); | |
1da177e4 | 985 | |
1da177e4 | 986 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd %p rtn %x\n", |
cadbd4a5 | 987 | __func__, scmd, rtn)); |
631c228c CH |
988 | |
989 | switch (rtn) { | |
990 | case NEEDS_RETRY: | |
1da177e4 LT |
991 | if (retry_cnt--) |
992 | goto retry_tur; | |
631c228c CH |
993 | /*FALLTHRU*/ |
994 | case SUCCESS: | |
e47373ec | 995 | return 0; |
631c228c CH |
996 | default: |
997 | return 1; | |
e47373ec | 998 | } |
1da177e4 LT |
999 | } |
1000 | ||
3eef6257 DJ |
1001 | /** |
1002 | * scsi_eh_test_devices - check if devices are responding from error recovery. | |
1003 | * @cmd_list: scsi commands in error recovery. | |
1004 | * @work_q: queue for commands which still need more error recovery | |
1005 | * @done_q: queue for commands which are finished | |
1006 | * @try_stu: boolean on if a STU command should be tried in addition to TUR. | |
1007 | * | |
1008 | * Decription: | |
1009 | * Tests if devices are in a working state. Commands to devices now in | |
1010 | * a working state are sent to the done_q while commands to devices which | |
1011 | * are still failing to respond are returned to the work_q for more | |
1012 | * processing. | |
1013 | **/ | |
1014 | static int scsi_eh_test_devices(struct list_head *cmd_list, | |
1015 | struct list_head *work_q, | |
1016 | struct list_head *done_q, int try_stu) | |
1017 | { | |
1018 | struct scsi_cmnd *scmd, *next; | |
1019 | struct scsi_device *sdev; | |
1020 | int finish_cmds; | |
1021 | ||
1022 | while (!list_empty(cmd_list)) { | |
1023 | scmd = list_entry(cmd_list->next, struct scsi_cmnd, eh_entry); | |
1024 | sdev = scmd->device; | |
1025 | ||
1026 | finish_cmds = !scsi_device_online(scmd->device) || | |
1027 | (try_stu && !scsi_eh_try_stu(scmd) && | |
1028 | !scsi_eh_tur(scmd)) || | |
1029 | !scsi_eh_tur(scmd); | |
1030 | ||
1031 | list_for_each_entry_safe(scmd, next, cmd_list, eh_entry) | |
1032 | if (scmd->device == sdev) { | |
1033 | if (finish_cmds) | |
1034 | scsi_eh_finish_cmd(scmd, done_q); | |
1035 | else | |
1036 | list_move_tail(&scmd->eh_entry, work_q); | |
1037 | } | |
1038 | } | |
1039 | return list_empty(work_q); | |
1040 | } | |
1041 | ||
1042 | ||
1da177e4 | 1043 | /** |
eb44820c RL |
1044 | * scsi_eh_abort_cmds - abort pending commands. |
1045 | * @work_q: &list_head for pending commands. | |
1046 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1047 | * |
1048 | * Decription: | |
1049 | * Try and see whether or not it makes sense to try and abort the | |
eb44820c RL |
1050 | * running command. This only works out to be the case if we have one |
1051 | * command that has timed out. If the command simply failed, it makes | |
1da177e4 LT |
1052 | * no sense to try and abort the command, since as far as the shost |
1053 | * adapter is concerned, it isn't running. | |
dc8875e1 | 1054 | */ |
1da177e4 LT |
1055 | static int scsi_eh_abort_cmds(struct list_head *work_q, |
1056 | struct list_head *done_q) | |
1057 | { | |
937abeaa | 1058 | struct scsi_cmnd *scmd, *next; |
3eef6257 | 1059 | LIST_HEAD(check_list); |
1da177e4 LT |
1060 | int rtn; |
1061 | ||
937abeaa | 1062 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 1063 | if (!(scmd->eh_eflags & SCSI_EH_CANCEL_CMD)) |
1da177e4 LT |
1064 | continue; |
1065 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting cmd:" | |
1066 | "0x%p\n", current->comm, | |
1067 | scmd)); | |
0bf8c869 | 1068 | rtn = scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd); |
2f2eb587 | 1069 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
3111b0d1 | 1070 | scmd->eh_eflags &= ~SCSI_EH_CANCEL_CMD; |
3eef6257 | 1071 | if (rtn == FAST_IO_FAIL) |
1da177e4 | 1072 | scsi_eh_finish_cmd(scmd, done_q); |
3eef6257 DJ |
1073 | else |
1074 | list_move_tail(&scmd->eh_entry, &check_list); | |
1da177e4 LT |
1075 | } else |
1076 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting" | |
1077 | " cmd failed:" | |
1078 | "0x%p\n", | |
1079 | current->comm, | |
1080 | scmd)); | |
1081 | } | |
1082 | ||
3eef6257 | 1083 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4 LT |
1084 | } |
1085 | ||
1da177e4 LT |
1086 | /** |
1087 | * scsi_eh_try_stu - Send START_UNIT to device. | |
eb44820c | 1088 | * @scmd: &scsi_cmnd to send START_UNIT |
1da177e4 LT |
1089 | * |
1090 | * Return value: | |
1091 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1092 | */ |
1da177e4 LT |
1093 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd) |
1094 | { | |
1095 | static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0}; | |
1da177e4 | 1096 | |
631c228c | 1097 | if (scmd->device->allow_restart) { |
ed773e66 BK |
1098 | int i, rtn = NEEDS_RETRY; |
1099 | ||
1100 | for (i = 0; rtn == NEEDS_RETRY && i < 2; i++) | |
9728c081 | 1101 | rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0); |
1da177e4 | 1102 | |
631c228c CH |
1103 | if (rtn == SUCCESS) |
1104 | return 0; | |
1105 | } | |
1da177e4 | 1106 | |
1da177e4 LT |
1107 | return 1; |
1108 | } | |
1109 | ||
1110 | /** | |
1111 | * scsi_eh_stu - send START_UNIT if needed | |
eb44820c RL |
1112 | * @shost: &scsi host being recovered. |
1113 | * @work_q: &list_head for pending commands. | |
1114 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1115 | * |
1116 | * Notes: | |
1117 | * If commands are failing due to not ready, initializing command required, | |
0bf8c869 | 1118 | * try revalidating the device, which will end up sending a start unit. |
dc8875e1 | 1119 | */ |
1da177e4 LT |
1120 | static int scsi_eh_stu(struct Scsi_Host *shost, |
1121 | struct list_head *work_q, | |
1122 | struct list_head *done_q) | |
1123 | { | |
937abeaa | 1124 | struct scsi_cmnd *scmd, *stu_scmd, *next; |
1da177e4 LT |
1125 | struct scsi_device *sdev; |
1126 | ||
1127 | shost_for_each_device(sdev, shost) { | |
1128 | stu_scmd = NULL; | |
1129 | list_for_each_entry(scmd, work_q, eh_entry) | |
1130 | if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) && | |
1131 | scsi_check_sense(scmd) == FAILED ) { | |
1132 | stu_scmd = scmd; | |
1133 | break; | |
1134 | } | |
1135 | ||
1136 | if (!stu_scmd) | |
1137 | continue; | |
1138 | ||
1139 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending START_UNIT to sdev:" | |
1140 | " 0x%p\n", current->comm, sdev)); | |
1141 | ||
1142 | if (!scsi_eh_try_stu(stu_scmd)) { | |
1143 | if (!scsi_device_online(sdev) || | |
1144 | !scsi_eh_tur(stu_scmd)) { | |
937abeaa CH |
1145 | list_for_each_entry_safe(scmd, next, |
1146 | work_q, eh_entry) { | |
1da177e4 LT |
1147 | if (scmd->device == sdev) |
1148 | scsi_eh_finish_cmd(scmd, done_q); | |
1149 | } | |
1150 | } | |
1151 | } else { | |
1152 | SCSI_LOG_ERROR_RECOVERY(3, | |
1153 | printk("%s: START_UNIT failed to sdev:" | |
1154 | " 0x%p\n", current->comm, sdev)); | |
1155 | } | |
1156 | } | |
1157 | ||
1158 | return list_empty(work_q); | |
1159 | } | |
1160 | ||
1161 | ||
1162 | /** | |
1163 | * scsi_eh_bus_device_reset - send bdr if needed | |
1164 | * @shost: scsi host being recovered. | |
eb44820c RL |
1165 | * @work_q: &list_head for pending commands. |
1166 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1167 | * |
1168 | * Notes: | |
eb44820c | 1169 | * Try a bus device reset. Still, look to see whether we have multiple |
1da177e4 LT |
1170 | * devices that are jammed or not - if we have multiple devices, it |
1171 | * makes no sense to try bus_device_reset - we really would need to try | |
0bf8c869 | 1172 | * a bus_reset instead. |
dc8875e1 | 1173 | */ |
1da177e4 LT |
1174 | static int scsi_eh_bus_device_reset(struct Scsi_Host *shost, |
1175 | struct list_head *work_q, | |
1176 | struct list_head *done_q) | |
1177 | { | |
937abeaa | 1178 | struct scsi_cmnd *scmd, *bdr_scmd, *next; |
1da177e4 LT |
1179 | struct scsi_device *sdev; |
1180 | int rtn; | |
1181 | ||
1182 | shost_for_each_device(sdev, shost) { | |
1183 | bdr_scmd = NULL; | |
1184 | list_for_each_entry(scmd, work_q, eh_entry) | |
1185 | if (scmd->device == sdev) { | |
1186 | bdr_scmd = scmd; | |
1187 | break; | |
1188 | } | |
1189 | ||
1190 | if (!bdr_scmd) | |
1191 | continue; | |
1192 | ||
1193 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BDR sdev:" | |
1194 | " 0x%p\n", current->comm, | |
1195 | sdev)); | |
1196 | rtn = scsi_try_bus_device_reset(bdr_scmd); | |
2f2eb587 | 1197 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
1da177e4 | 1198 | if (!scsi_device_online(sdev) || |
2f2eb587 | 1199 | rtn == FAST_IO_FAIL || |
1da177e4 | 1200 | !scsi_eh_tur(bdr_scmd)) { |
937abeaa CH |
1201 | list_for_each_entry_safe(scmd, next, |
1202 | work_q, eh_entry) { | |
1da177e4 LT |
1203 | if (scmd->device == sdev) |
1204 | scsi_eh_finish_cmd(scmd, | |
1205 | done_q); | |
1206 | } | |
1207 | } | |
1208 | } else { | |
1209 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BDR" | |
1210 | " failed sdev:" | |
1211 | "0x%p\n", | |
1212 | current->comm, | |
1213 | sdev)); | |
1214 | } | |
1215 | } | |
1216 | ||
1217 | return list_empty(work_q); | |
1218 | } | |
1219 | ||
30bd7df8 MC |
1220 | /** |
1221 | * scsi_eh_target_reset - send target reset if needed | |
1222 | * @shost: scsi host being recovered. | |
1223 | * @work_q: &list_head for pending commands. | |
1224 | * @done_q: &list_head for processed commands. | |
1225 | * | |
1226 | * Notes: | |
1227 | * Try a target reset. | |
1228 | */ | |
1229 | static int scsi_eh_target_reset(struct Scsi_Host *shost, | |
1230 | struct list_head *work_q, | |
1231 | struct list_head *done_q) | |
1232 | { | |
98db5195 | 1233 | LIST_HEAD(tmp_list); |
3eef6257 | 1234 | LIST_HEAD(check_list); |
30bd7df8 | 1235 | |
98db5195 JB |
1236 | list_splice_init(work_q, &tmp_list); |
1237 | ||
1238 | while (!list_empty(&tmp_list)) { | |
1239 | struct scsi_cmnd *next, *scmd; | |
1240 | int rtn; | |
1241 | unsigned int id; | |
1242 | ||
1243 | scmd = list_entry(tmp_list.next, struct scsi_cmnd, eh_entry); | |
1244 | id = scmd_id(scmd); | |
30bd7df8 MC |
1245 | |
1246 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending target reset " | |
1247 | "to target %d\n", | |
1248 | current->comm, id)); | |
98db5195 JB |
1249 | rtn = scsi_try_target_reset(scmd); |
1250 | if (rtn != SUCCESS && rtn != FAST_IO_FAIL) | |
30bd7df8 MC |
1251 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Target reset" |
1252 | " failed target: " | |
1253 | "%d\n", | |
1254 | current->comm, id)); | |
98db5195 JB |
1255 | list_for_each_entry_safe(scmd, next, &tmp_list, eh_entry) { |
1256 | if (scmd_id(scmd) != id) | |
1257 | continue; | |
1258 | ||
3eef6257 DJ |
1259 | if (rtn == SUCCESS) |
1260 | list_move_tail(&scmd->eh_entry, &check_list); | |
1261 | else if (rtn == FAST_IO_FAIL) | |
98db5195 JB |
1262 | scsi_eh_finish_cmd(scmd, done_q); |
1263 | else | |
1264 | /* push back on work queue for further processing */ | |
1265 | list_move(&scmd->eh_entry, work_q); | |
1266 | } | |
1267 | } | |
30bd7df8 | 1268 | |
3eef6257 | 1269 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
30bd7df8 MC |
1270 | } |
1271 | ||
1da177e4 | 1272 | /** |
0bf8c869 | 1273 | * scsi_eh_bus_reset - send a bus reset |
eb44820c RL |
1274 | * @shost: &scsi host being recovered. |
1275 | * @work_q: &list_head for pending commands. | |
1276 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1277 | */ |
1da177e4 LT |
1278 | static int scsi_eh_bus_reset(struct Scsi_Host *shost, |
1279 | struct list_head *work_q, | |
1280 | struct list_head *done_q) | |
1281 | { | |
937abeaa | 1282 | struct scsi_cmnd *scmd, *chan_scmd, *next; |
3eef6257 | 1283 | LIST_HEAD(check_list); |
1da177e4 LT |
1284 | unsigned int channel; |
1285 | int rtn; | |
1286 | ||
1287 | /* | |
1288 | * we really want to loop over the various channels, and do this on | |
1289 | * a channel by channel basis. we should also check to see if any | |
1290 | * of the failed commands are on soft_reset devices, and if so, skip | |
0bf8c869 | 1291 | * the reset. |
1da177e4 LT |
1292 | */ |
1293 | ||
1294 | for (channel = 0; channel <= shost->max_channel; channel++) { | |
1295 | chan_scmd = NULL; | |
1296 | list_for_each_entry(scmd, work_q, eh_entry) { | |
422c0d61 | 1297 | if (channel == scmd_channel(scmd)) { |
1da177e4 LT |
1298 | chan_scmd = scmd; |
1299 | break; | |
1300 | /* | |
1301 | * FIXME add back in some support for | |
1302 | * soft_reset devices. | |
1303 | */ | |
1304 | } | |
1305 | } | |
1306 | ||
1307 | if (!chan_scmd) | |
1308 | continue; | |
1309 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BRST chan:" | |
1310 | " %d\n", current->comm, | |
1311 | channel)); | |
1312 | rtn = scsi_try_bus_reset(chan_scmd); | |
2f2eb587 | 1313 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
937abeaa | 1314 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3eef6257 DJ |
1315 | if (channel == scmd_channel(scmd)) { |
1316 | if (rtn == FAST_IO_FAIL) | |
1da177e4 LT |
1317 | scsi_eh_finish_cmd(scmd, |
1318 | done_q); | |
3eef6257 DJ |
1319 | else |
1320 | list_move_tail(&scmd->eh_entry, | |
1321 | &check_list); | |
1322 | } | |
1da177e4 LT |
1323 | } |
1324 | } else { | |
1325 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BRST" | |
1326 | " failed chan: %d\n", | |
1327 | current->comm, | |
1328 | channel)); | |
1329 | } | |
1330 | } | |
3eef6257 | 1331 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4 LT |
1332 | } |
1333 | ||
1334 | /** | |
0bf8c869 | 1335 | * scsi_eh_host_reset - send a host reset |
1da177e4 LT |
1336 | * @work_q: list_head for processed commands. |
1337 | * @done_q: list_head for processed commands. | |
dc8875e1 | 1338 | */ |
1da177e4 LT |
1339 | static int scsi_eh_host_reset(struct list_head *work_q, |
1340 | struct list_head *done_q) | |
1341 | { | |
937abeaa | 1342 | struct scsi_cmnd *scmd, *next; |
3eef6257 | 1343 | LIST_HEAD(check_list); |
1da177e4 | 1344 | int rtn; |
1da177e4 LT |
1345 | |
1346 | if (!list_empty(work_q)) { | |
1347 | scmd = list_entry(work_q->next, | |
1348 | struct scsi_cmnd, eh_entry); | |
1349 | ||
1350 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending HRST\n" | |
1351 | , current->comm)); | |
1352 | ||
1353 | rtn = scsi_try_host_reset(scmd); | |
3eef6257 DJ |
1354 | if (rtn == SUCCESS) { |
1355 | list_splice_init(work_q, &check_list); | |
1356 | } else if (rtn == FAST_IO_FAIL) { | |
937abeaa | 1357 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1da177e4 LT |
1358 | scsi_eh_finish_cmd(scmd, done_q); |
1359 | } | |
1360 | } else { | |
1361 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: HRST" | |
1362 | " failed\n", | |
1363 | current->comm)); | |
1364 | } | |
1365 | } | |
3eef6257 | 1366 | return scsi_eh_test_devices(&check_list, work_q, done_q, 1); |
1da177e4 LT |
1367 | } |
1368 | ||
1369 | /** | |
1370 | * scsi_eh_offline_sdevs - offline scsi devices that fail to recover | |
1371 | * @work_q: list_head for processed commands. | |
1372 | * @done_q: list_head for processed commands. | |
dc8875e1 | 1373 | */ |
1da177e4 LT |
1374 | static void scsi_eh_offline_sdevs(struct list_head *work_q, |
1375 | struct list_head *done_q) | |
1376 | { | |
937abeaa | 1377 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1378 | |
937abeaa | 1379 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
31765d7d MW |
1380 | sdev_printk(KERN_INFO, scmd->device, "Device offlined - " |
1381 | "not ready after error recovery\n"); | |
1da177e4 | 1382 | scsi_device_set_state(scmd->device, SDEV_OFFLINE); |
3111b0d1 | 1383 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) { |
1da177e4 LT |
1384 | /* |
1385 | * FIXME: Handle lost cmds. | |
1386 | */ | |
1387 | } | |
1388 | scsi_eh_finish_cmd(scmd, done_q); | |
1389 | } | |
1390 | return; | |
1391 | } | |
1392 | ||
4a27446f MC |
1393 | /** |
1394 | * scsi_noretry_cmd - determinte if command should be failed fast | |
1395 | * @scmd: SCSI cmd to examine. | |
1396 | */ | |
1397 | int scsi_noretry_cmd(struct scsi_cmnd *scmd) | |
1398 | { | |
1399 | switch (host_byte(scmd->result)) { | |
1400 | case DID_OK: | |
1401 | break; | |
1402 | case DID_BUS_BUSY: | |
33659ebb | 1403 | return (scmd->request->cmd_flags & REQ_FAILFAST_TRANSPORT); |
4a27446f | 1404 | case DID_PARITY: |
33659ebb | 1405 | return (scmd->request->cmd_flags & REQ_FAILFAST_DEV); |
4a27446f MC |
1406 | case DID_ERROR: |
1407 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1408 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1409 | return 0; | |
1410 | /* fall through */ | |
1411 | case DID_SOFT_ERROR: | |
33659ebb | 1412 | return (scmd->request->cmd_flags & REQ_FAILFAST_DRIVER); |
4a27446f MC |
1413 | } |
1414 | ||
1415 | switch (status_byte(scmd->result)) { | |
1416 | case CHECK_CONDITION: | |
1417 | /* | |
1418 | * assume caller has checked sense and determinted | |
1419 | * the check condition was retryable. | |
1420 | */ | |
e96f6abe FT |
1421 | if (scmd->request->cmd_flags & REQ_FAILFAST_DEV || |
1422 | scmd->request->cmd_type == REQ_TYPE_BLOCK_PC) | |
1423 | return 1; | |
4a27446f MC |
1424 | } |
1425 | ||
1426 | return 0; | |
1427 | } | |
1428 | ||
1da177e4 LT |
1429 | /** |
1430 | * scsi_decide_disposition - Disposition a cmd on return from LLD. | |
1431 | * @scmd: SCSI cmd to examine. | |
1432 | * | |
1433 | * Notes: | |
1434 | * This is *only* called when we are examining the status after sending | |
1435 | * out the actual data command. any commands that are queued for error | |
1436 | * recovery (e.g. test_unit_ready) do *not* come through here. | |
1437 | * | |
1438 | * When this routine returns failed, it means the error handler thread | |
1439 | * is woken. In cases where the error code indicates an error that | |
1440 | * doesn't require the error handler read (i.e. we don't need to | |
1441 | * abort/reset), this function should return SUCCESS. | |
dc8875e1 | 1442 | */ |
1da177e4 LT |
1443 | int scsi_decide_disposition(struct scsi_cmnd *scmd) |
1444 | { | |
1445 | int rtn; | |
1446 | ||
1447 | /* | |
1448 | * if the device is offline, then we clearly just pass the result back | |
1449 | * up to the top level. | |
1450 | */ | |
1451 | if (!scsi_device_online(scmd->device)) { | |
1452 | SCSI_LOG_ERROR_RECOVERY(5, printk("%s: device offline - report" | |
1453 | " as SUCCESS\n", | |
cadbd4a5 | 1454 | __func__)); |
1da177e4 LT |
1455 | return SUCCESS; |
1456 | } | |
1457 | ||
1458 | /* | |
1459 | * first check the host byte, to see if there is anything in there | |
1460 | * that would indicate what we need to do. | |
1461 | */ | |
1462 | switch (host_byte(scmd->result)) { | |
1463 | case DID_PASSTHROUGH: | |
1464 | /* | |
1465 | * no matter what, pass this through to the upper layer. | |
1466 | * nuke this special code so that it looks like we are saying | |
1467 | * did_ok. | |
1468 | */ | |
1469 | scmd->result &= 0xff00ffff; | |
1470 | return SUCCESS; | |
1471 | case DID_OK: | |
1472 | /* | |
1473 | * looks good. drop through, and check the next byte. | |
1474 | */ | |
1475 | break; | |
1476 | case DID_NO_CONNECT: | |
1477 | case DID_BAD_TARGET: | |
1478 | case DID_ABORT: | |
1479 | /* | |
1480 | * note - this means that we just report the status back | |
1481 | * to the top level driver, not that we actually think | |
1482 | * that it indicates SUCCESS. | |
1483 | */ | |
1484 | return SUCCESS; | |
1485 | /* | |
1486 | * when the low level driver returns did_soft_error, | |
0bf8c869 | 1487 | * it is responsible for keeping an internal retry counter |
1da177e4 LT |
1488 | * in order to avoid endless loops (db) |
1489 | * | |
1490 | * actually this is a bug in this function here. we should | |
1491 | * be mindful of the maximum number of retries specified | |
1492 | * and not get stuck in a loop. | |
1493 | */ | |
1494 | case DID_SOFT_ERROR: | |
1495 | goto maybe_retry; | |
1496 | case DID_IMM_RETRY: | |
1497 | return NEEDS_RETRY; | |
1498 | ||
bf341919 | 1499 | case DID_REQUEUE: |
1500 | return ADD_TO_MLQUEUE; | |
a4dfaa6f MC |
1501 | case DID_TRANSPORT_DISRUPTED: |
1502 | /* | |
1503 | * LLD/transport was disrupted during processing of the IO. | |
1504 | * The transport class is now blocked/blocking, | |
1505 | * and the transport will decide what to do with the IO | |
939c2288 MC |
1506 | * based on its timers and recovery capablilities if |
1507 | * there are enough retries. | |
a4dfaa6f | 1508 | */ |
939c2288 | 1509 | goto maybe_retry; |
a4dfaa6f MC |
1510 | case DID_TRANSPORT_FAILFAST: |
1511 | /* | |
1512 | * The transport decided to failfast the IO (most likely | |
1513 | * the fast io fail tmo fired), so send IO directly upwards. | |
1514 | */ | |
1515 | return SUCCESS; | |
1da177e4 LT |
1516 | case DID_ERROR: |
1517 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1518 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1519 | /* | |
1520 | * execute reservation conflict processing code | |
1521 | * lower down | |
1522 | */ | |
1523 | break; | |
1524 | /* fallthrough */ | |
1da177e4 LT |
1525 | case DID_BUS_BUSY: |
1526 | case DID_PARITY: | |
1527 | goto maybe_retry; | |
1528 | case DID_TIME_OUT: | |
1529 | /* | |
1530 | * when we scan the bus, we get timeout messages for | |
1531 | * these commands if there is no device available. | |
1532 | * other hosts report did_no_connect for the same thing. | |
1533 | */ | |
1534 | if ((scmd->cmnd[0] == TEST_UNIT_READY || | |
1535 | scmd->cmnd[0] == INQUIRY)) { | |
1536 | return SUCCESS; | |
1537 | } else { | |
1538 | return FAILED; | |
1539 | } | |
1540 | case DID_RESET: | |
1541 | return SUCCESS; | |
1542 | default: | |
1543 | return FAILED; | |
1544 | } | |
1545 | ||
1546 | /* | |
1547 | * next, check the message byte. | |
1548 | */ | |
1549 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
1550 | return FAILED; | |
1551 | ||
1552 | /* | |
1553 | * check the status byte to see if this indicates anything special. | |
1554 | */ | |
1555 | switch (status_byte(scmd->result)) { | |
1556 | case QUEUE_FULL: | |
42a6a918 | 1557 | scsi_handle_queue_full(scmd->device); |
1da177e4 LT |
1558 | /* |
1559 | * the case of trying to send too many commands to a | |
1560 | * tagged queueing device. | |
1561 | */ | |
1562 | case BUSY: | |
1563 | /* | |
1564 | * device can't talk to us at the moment. Should only | |
1565 | * occur (SAM-3) when the task queue is empty, so will cause | |
1566 | * the empty queue handling to trigger a stall in the | |
1567 | * device. | |
1568 | */ | |
1569 | return ADD_TO_MLQUEUE; | |
1570 | case GOOD: | |
4a84067d | 1571 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 | 1572 | case COMMAND_TERMINATED: |
1da177e4 | 1573 | return SUCCESS; |
a9b589d9 VB |
1574 | case TASK_ABORTED: |
1575 | goto maybe_retry; | |
1da177e4 LT |
1576 | case CHECK_CONDITION: |
1577 | rtn = scsi_check_sense(scmd); | |
1578 | if (rtn == NEEDS_RETRY) | |
1579 | goto maybe_retry; | |
63583cca HR |
1580 | else if (rtn == TARGET_ERROR) { |
1581 | /* | |
1582 | * Need to modify host byte to signal a | |
1583 | * permanent target failure | |
1584 | */ | |
2082ebc4 | 1585 | set_host_byte(scmd, DID_TARGET_FAILURE); |
63583cca HR |
1586 | rtn = SUCCESS; |
1587 | } | |
1da177e4 LT |
1588 | /* if rtn == FAILED, we have no sense information; |
1589 | * returning FAILED will wake the error handler thread | |
1590 | * to collect the sense and redo the decide | |
1591 | * disposition */ | |
1592 | return rtn; | |
1593 | case CONDITION_GOOD: | |
1594 | case INTERMEDIATE_GOOD: | |
1595 | case INTERMEDIATE_C_GOOD: | |
1596 | case ACA_ACTIVE: | |
1597 | /* | |
1598 | * who knows? FIXME(eric) | |
1599 | */ | |
1600 | return SUCCESS; | |
1601 | ||
1602 | case RESERVATION_CONFLICT: | |
9ccfc756 JB |
1603 | sdev_printk(KERN_INFO, scmd->device, |
1604 | "reservation conflict\n"); | |
2082ebc4 | 1605 | set_host_byte(scmd, DID_NEXUS_FAILURE); |
1da177e4 LT |
1606 | return SUCCESS; /* causes immediate i/o error */ |
1607 | default: | |
1608 | return FAILED; | |
1609 | } | |
1610 | return FAILED; | |
1611 | ||
1612 | maybe_retry: | |
1613 | ||
1614 | /* we requeue for retry because the error was retryable, and | |
1615 | * the request was not marked fast fail. Note that above, | |
1616 | * even if the request is marked fast fail, we still requeue | |
1617 | * for queue congestion conditions (QUEUE_FULL or BUSY) */ | |
8884efab | 1618 | if ((++scmd->retries) <= scmd->allowed |
4a27446f | 1619 | && !scsi_noretry_cmd(scmd)) { |
1da177e4 LT |
1620 | return NEEDS_RETRY; |
1621 | } else { | |
1622 | /* | |
1623 | * no more retries - report this one back to upper level. | |
1624 | */ | |
1625 | return SUCCESS; | |
1626 | } | |
1627 | } | |
1628 | ||
f078727b FT |
1629 | static void eh_lock_door_done(struct request *req, int uptodate) |
1630 | { | |
1631 | __blk_put_request(req->q, req); | |
1632 | } | |
1633 | ||
1da177e4 LT |
1634 | /** |
1635 | * scsi_eh_lock_door - Prevent medium removal for the specified device | |
1636 | * @sdev: SCSI device to prevent medium removal | |
1637 | * | |
1638 | * Locking: | |
91bc31fb | 1639 | * We must be called from process context. |
1da177e4 LT |
1640 | * |
1641 | * Notes: | |
1642 | * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the | |
1643 | * head of the devices request queue, and continue. | |
dc8875e1 | 1644 | */ |
1da177e4 LT |
1645 | static void scsi_eh_lock_door(struct scsi_device *sdev) |
1646 | { | |
f078727b | 1647 | struct request *req; |
1da177e4 | 1648 | |
91bc31fb JB |
1649 | /* |
1650 | * blk_get_request with GFP_KERNEL (__GFP_WAIT) sleeps until a | |
1651 | * request becomes available | |
1652 | */ | |
f078727b | 1653 | req = blk_get_request(sdev->request_queue, READ, GFP_KERNEL); |
1da177e4 | 1654 | |
f078727b FT |
1655 | req->cmd[0] = ALLOW_MEDIUM_REMOVAL; |
1656 | req->cmd[1] = 0; | |
1657 | req->cmd[2] = 0; | |
1658 | req->cmd[3] = 0; | |
1659 | req->cmd[4] = SCSI_REMOVAL_PREVENT; | |
1660 | req->cmd[5] = 0; | |
1da177e4 | 1661 | |
f078727b FT |
1662 | req->cmd_len = COMMAND_SIZE(req->cmd[0]); |
1663 | ||
1664 | req->cmd_type = REQ_TYPE_BLOCK_PC; | |
1665 | req->cmd_flags |= REQ_QUIET; | |
1666 | req->timeout = 10 * HZ; | |
1667 | req->retries = 5; | |
1668 | ||
1669 | blk_execute_rq_nowait(req->q, NULL, req, 1, eh_lock_door_done); | |
1670 | } | |
1da177e4 LT |
1671 | |
1672 | /** | |
1673 | * scsi_restart_operations - restart io operations to the specified host. | |
1674 | * @shost: Host we are restarting. | |
1675 | * | |
1676 | * Notes: | |
1677 | * When we entered the error handler, we blocked all further i/o to | |
1678 | * this device. we need to 'reverse' this process. | |
dc8875e1 | 1679 | */ |
1da177e4 LT |
1680 | static void scsi_restart_operations(struct Scsi_Host *shost) |
1681 | { | |
1682 | struct scsi_device *sdev; | |
939647ee | 1683 | unsigned long flags; |
1da177e4 LT |
1684 | |
1685 | /* | |
1686 | * If the door was locked, we need to insert a door lock request | |
1687 | * onto the head of the SCSI request queue for the device. There | |
1688 | * is no point trying to lock the door of an off-line device. | |
1689 | */ | |
1690 | shost_for_each_device(sdev, shost) { | |
1691 | if (scsi_device_online(sdev) && sdev->locked) | |
1692 | scsi_eh_lock_door(sdev); | |
1693 | } | |
1694 | ||
1695 | /* | |
1696 | * next free up anything directly waiting upon the host. this | |
1697 | * will be requests for character device operations, and also for | |
1698 | * ioctls to queued block devices. | |
1699 | */ | |
1700 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: waking up host to restart\n", | |
cadbd4a5 | 1701 | __func__)); |
1da177e4 | 1702 | |
939647ee JB |
1703 | spin_lock_irqsave(shost->host_lock, flags); |
1704 | if (scsi_host_set_state(shost, SHOST_RUNNING)) | |
1705 | if (scsi_host_set_state(shost, SHOST_CANCEL)) | |
1706 | BUG_ON(scsi_host_set_state(shost, SHOST_DEL)); | |
1707 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
1708 | |
1709 | wake_up(&shost->host_wait); | |
1710 | ||
1711 | /* | |
1712 | * finally we need to re-initiate requests that may be pending. we will | |
1713 | * have had everything blocked while error handling is taking place, and | |
1714 | * now that error recovery is done, we will need to ensure that these | |
1715 | * requests are started. | |
1716 | */ | |
1717 | scsi_run_host_queues(shost); | |
57fc2e33 DW |
1718 | |
1719 | /* | |
1720 | * if eh is active and host_eh_scheduled is pending we need to re-run | |
1721 | * recovery. we do this check after scsi_run_host_queues() to allow | |
1722 | * everything pent up since the last eh run a chance to make forward | |
1723 | * progress before we sync again. Either we'll immediately re-run | |
1724 | * recovery or scsi_device_unbusy() will wake us again when these | |
1725 | * pending commands complete. | |
1726 | */ | |
1727 | spin_lock_irqsave(shost->host_lock, flags); | |
1728 | if (shost->host_eh_scheduled) | |
1729 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) | |
1730 | WARN_ON(scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)); | |
1731 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
1732 | } |
1733 | ||
1734 | /** | |
1735 | * scsi_eh_ready_devs - check device ready state and recover if not. | |
1736 | * @shost: host to be recovered. | |
eb44820c RL |
1737 | * @work_q: &list_head for pending commands. |
1738 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1739 | */ |
dca84e46 DW |
1740 | void scsi_eh_ready_devs(struct Scsi_Host *shost, |
1741 | struct list_head *work_q, | |
1742 | struct list_head *done_q) | |
1da177e4 LT |
1743 | { |
1744 | if (!scsi_eh_stu(shost, work_q, done_q)) | |
1745 | if (!scsi_eh_bus_device_reset(shost, work_q, done_q)) | |
30bd7df8 MC |
1746 | if (!scsi_eh_target_reset(shost, work_q, done_q)) |
1747 | if (!scsi_eh_bus_reset(shost, work_q, done_q)) | |
1748 | if (!scsi_eh_host_reset(work_q, done_q)) | |
1749 | scsi_eh_offline_sdevs(work_q, | |
1750 | done_q); | |
1da177e4 | 1751 | } |
dca84e46 | 1752 | EXPORT_SYMBOL_GPL(scsi_eh_ready_devs); |
1da177e4 LT |
1753 | |
1754 | /** | |
1755 | * scsi_eh_flush_done_q - finish processed commands or retry them. | |
1756 | * @done_q: list_head of processed commands. | |
dc8875e1 | 1757 | */ |
041c5fc3 | 1758 | void scsi_eh_flush_done_q(struct list_head *done_q) |
1da177e4 | 1759 | { |
937abeaa | 1760 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1761 | |
937abeaa CH |
1762 | list_for_each_entry_safe(scmd, next, done_q, eh_entry) { |
1763 | list_del_init(&scmd->eh_entry); | |
1da177e4 | 1764 | if (scsi_device_online(scmd->device) && |
4a27446f | 1765 | !scsi_noretry_cmd(scmd) && |
8884efab | 1766 | (++scmd->retries <= scmd->allowed)) { |
1da177e4 LT |
1767 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush" |
1768 | " retry cmd: %p\n", | |
1769 | current->comm, | |
1770 | scmd)); | |
1771 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); | |
1772 | } else { | |
793698ce PM |
1773 | /* |
1774 | * If just we got sense for the device (called | |
1775 | * scsi_eh_get_sense), scmd->result is already | |
1776 | * set, do not set DRIVER_TIMEOUT. | |
1777 | */ | |
1da177e4 LT |
1778 | if (!scmd->result) |
1779 | scmd->result |= (DRIVER_TIMEOUT << 24); | |
1780 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush finish" | |
1781 | " cmd: %p\n", | |
1782 | current->comm, scmd)); | |
1783 | scsi_finish_command(scmd); | |
1784 | } | |
1785 | } | |
1786 | } | |
041c5fc3 | 1787 | EXPORT_SYMBOL(scsi_eh_flush_done_q); |
1da177e4 LT |
1788 | |
1789 | /** | |
1790 | * scsi_unjam_host - Attempt to fix a host which has a cmd that failed. | |
1791 | * @shost: Host to unjam. | |
1792 | * | |
1793 | * Notes: | |
1794 | * When we come in here, we *know* that all commands on the bus have | |
1795 | * either completed, failed or timed out. we also know that no further | |
1796 | * commands are being sent to the host, so things are relatively quiet | |
1797 | * and we have freedom to fiddle with things as we wish. | |
1798 | * | |
1799 | * This is only the *default* implementation. it is possible for | |
1800 | * individual drivers to supply their own version of this function, and | |
1801 | * if the maintainer wishes to do this, it is strongly suggested that | |
1802 | * this function be taken as a template and modified. this function | |
1803 | * was designed to correctly handle problems for about 95% of the | |
1804 | * different cases out there, and it should always provide at least a | |
1805 | * reasonable amount of error recovery. | |
1806 | * | |
1807 | * Any command marked 'failed' or 'timeout' must eventually have | |
1808 | * scsi_finish_cmd() called for it. we do all of the retry stuff | |
1809 | * here, so when we restart the host after we return it should have an | |
1810 | * empty queue. | |
dc8875e1 | 1811 | */ |
1da177e4 LT |
1812 | static void scsi_unjam_host(struct Scsi_Host *shost) |
1813 | { | |
1814 | unsigned long flags; | |
1815 | LIST_HEAD(eh_work_q); | |
1816 | LIST_HEAD(eh_done_q); | |
1817 | ||
1818 | spin_lock_irqsave(shost->host_lock, flags); | |
1819 | list_splice_init(&shost->eh_cmd_q, &eh_work_q); | |
1820 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1821 | ||
1822 | SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost, &eh_work_q)); | |
1823 | ||
1824 | if (!scsi_eh_get_sense(&eh_work_q, &eh_done_q)) | |
1825 | if (!scsi_eh_abort_cmds(&eh_work_q, &eh_done_q)) | |
1826 | scsi_eh_ready_devs(shost, &eh_work_q, &eh_done_q); | |
1827 | ||
1828 | scsi_eh_flush_done_q(&eh_done_q); | |
1829 | } | |
1830 | ||
1831 | /** | |
ad42eb1b | 1832 | * scsi_error_handler - SCSI error handler thread |
1da177e4 LT |
1833 | * @data: Host for which we are running. |
1834 | * | |
1835 | * Notes: | |
ad42eb1b CH |
1836 | * This is the main error handling loop. This is run as a kernel thread |
1837 | * for every SCSI host and handles all error handling activity. | |
dc8875e1 | 1838 | */ |
1da177e4 LT |
1839 | int scsi_error_handler(void *data) |
1840 | { | |
ad42eb1b | 1841 | struct Scsi_Host *shost = data; |
1da177e4 | 1842 | |
1da177e4 | 1843 | /* |
ad42eb1b CH |
1844 | * We use TASK_INTERRUPTIBLE so that the thread is not |
1845 | * counted against the load average as a running process. | |
1846 | * We never actually get interrupted because kthread_run | |
c03264a7 | 1847 | * disables signal delivery for the created thread. |
1da177e4 | 1848 | */ |
3ed7a470 | 1849 | while (!kthread_should_stop()) { |
b9d5c6b7 | 1850 | set_current_state(TASK_INTERRUPTIBLE); |
ee7863bc | 1851 | if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) || |
3ed7a470 | 1852 | shost->host_failed != shost->host_busy) { |
ad42eb1b CH |
1853 | SCSI_LOG_ERROR_RECOVERY(1, |
1854 | printk("Error handler scsi_eh_%d sleeping\n", | |
1855 | shost->host_no)); | |
3ed7a470 | 1856 | schedule(); |
3ed7a470 JB |
1857 | continue; |
1858 | } | |
1da177e4 | 1859 | |
3ed7a470 | 1860 | __set_current_state(TASK_RUNNING); |
ad42eb1b CH |
1861 | SCSI_LOG_ERROR_RECOVERY(1, |
1862 | printk("Error handler scsi_eh_%d waking up\n", | |
1863 | shost->host_no)); | |
1da177e4 | 1864 | |
1da177e4 LT |
1865 | /* |
1866 | * We have a host that is failing for some reason. Figure out | |
1867 | * what we need to do to get it up and online again (if we can). | |
1868 | * If we fail, we end up taking the thing offline. | |
1869 | */ | |
ae0751ff | 1870 | if (!shost->eh_noresume && scsi_autopm_get_host(shost) != 0) { |
bc4f2401 AS |
1871 | SCSI_LOG_ERROR_RECOVERY(1, |
1872 | printk(KERN_ERR "Error handler scsi_eh_%d " | |
1873 | "unable to autoresume\n", | |
1874 | shost->host_no)); | |
1875 | continue; | |
1876 | } | |
1877 | ||
9227c33d CH |
1878 | if (shost->transportt->eh_strategy_handler) |
1879 | shost->transportt->eh_strategy_handler(shost); | |
1da177e4 LT |
1880 | else |
1881 | scsi_unjam_host(shost); | |
1882 | ||
1da177e4 LT |
1883 | /* |
1884 | * Note - if the above fails completely, the action is to take | |
1885 | * individual devices offline and flush the queue of any | |
1886 | * outstanding requests that may have been pending. When we | |
1887 | * restart, we restart any I/O to any other devices on the bus | |
1888 | * which are still online. | |
1889 | */ | |
1890 | scsi_restart_operations(shost); | |
ae0751ff LM |
1891 | if (!shost->eh_noresume) |
1892 | scsi_autopm_put_host(shost); | |
1da177e4 | 1893 | } |
461a0ffb SR |
1894 | __set_current_state(TASK_RUNNING); |
1895 | ||
ad42eb1b CH |
1896 | SCSI_LOG_ERROR_RECOVERY(1, |
1897 | printk("Error handler scsi_eh_%d exiting\n", shost->host_no)); | |
3ed7a470 | 1898 | shost->ehandler = NULL; |
1da177e4 LT |
1899 | return 0; |
1900 | } | |
1901 | ||
1902 | /* | |
1903 | * Function: scsi_report_bus_reset() | |
1904 | * | |
1905 | * Purpose: Utility function used by low-level drivers to report that | |
1906 | * they have observed a bus reset on the bus being handled. | |
1907 | * | |
1908 | * Arguments: shost - Host in question | |
1909 | * channel - channel on which reset was observed. | |
1910 | * | |
1911 | * Returns: Nothing | |
1912 | * | |
1913 | * Lock status: Host lock must be held. | |
1914 | * | |
1915 | * Notes: This only needs to be called if the reset is one which | |
1916 | * originates from an unknown location. Resets originated | |
1917 | * by the mid-level itself don't need to call this, but there | |
1918 | * should be no harm. | |
1919 | * | |
1920 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
1921 | * is properly treated. | |
1922 | */ | |
1923 | void scsi_report_bus_reset(struct Scsi_Host *shost, int channel) | |
1924 | { | |
1925 | struct scsi_device *sdev; | |
1926 | ||
1927 | __shost_for_each_device(sdev, shost) { | |
30bd7df8 MC |
1928 | if (channel == sdev_channel(sdev)) |
1929 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
1930 | } |
1931 | } | |
1932 | EXPORT_SYMBOL(scsi_report_bus_reset); | |
1933 | ||
1934 | /* | |
1935 | * Function: scsi_report_device_reset() | |
1936 | * | |
1937 | * Purpose: Utility function used by low-level drivers to report that | |
1938 | * they have observed a device reset on the device being handled. | |
1939 | * | |
1940 | * Arguments: shost - Host in question | |
1941 | * channel - channel on which reset was observed | |
1942 | * target - target on which reset was observed | |
1943 | * | |
1944 | * Returns: Nothing | |
1945 | * | |
1946 | * Lock status: Host lock must be held | |
1947 | * | |
1948 | * Notes: This only needs to be called if the reset is one which | |
1949 | * originates from an unknown location. Resets originated | |
1950 | * by the mid-level itself don't need to call this, but there | |
1951 | * should be no harm. | |
1952 | * | |
1953 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
1954 | * is properly treated. | |
1955 | */ | |
1956 | void scsi_report_device_reset(struct Scsi_Host *shost, int channel, int target) | |
1957 | { | |
1958 | struct scsi_device *sdev; | |
1959 | ||
1960 | __shost_for_each_device(sdev, shost) { | |
422c0d61 | 1961 | if (channel == sdev_channel(sdev) && |
30bd7df8 MC |
1962 | target == sdev_id(sdev)) |
1963 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
1964 | } |
1965 | } | |
1966 | EXPORT_SYMBOL(scsi_report_device_reset); | |
1967 | ||
1968 | static void | |
1969 | scsi_reset_provider_done_command(struct scsi_cmnd *scmd) | |
1970 | { | |
1971 | } | |
1972 | ||
1973 | /* | |
1974 | * Function: scsi_reset_provider | |
1975 | * | |
1976 | * Purpose: Send requested reset to a bus or device at any phase. | |
1977 | * | |
1978 | * Arguments: device - device to send reset to | |
1979 | * flag - reset type (see scsi.h) | |
1980 | * | |
1981 | * Returns: SUCCESS/FAILURE. | |
1982 | * | |
1983 | * Notes: This is used by the SCSI Generic driver to provide | |
1984 | * Bus/Device reset capability. | |
1985 | */ | |
1986 | int | |
1987 | scsi_reset_provider(struct scsi_device *dev, int flag) | |
1988 | { | |
bc4f2401 | 1989 | struct scsi_cmnd *scmd; |
d7a1bb0a | 1990 | struct Scsi_Host *shost = dev->host; |
1da177e4 | 1991 | struct request req; |
d7a1bb0a | 1992 | unsigned long flags; |
1da177e4 LT |
1993 | int rtn; |
1994 | ||
bc4f2401 AS |
1995 | if (scsi_autopm_get_host(shost) < 0) |
1996 | return FAILED; | |
1997 | ||
1998 | scmd = scsi_get_command(dev, GFP_KERNEL); | |
4f54eec8 | 1999 | blk_rq_init(NULL, &req); |
1da177e4 | 2000 | scmd->request = &req; |
b4edcbca | 2001 | |
64a87b24 BH |
2002 | scmd->cmnd = req.cmd; |
2003 | ||
1da177e4 | 2004 | scmd->scsi_done = scsi_reset_provider_done_command; |
30b0c37b | 2005 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
1da177e4 LT |
2006 | |
2007 | scmd->cmd_len = 0; | |
2008 | ||
2009 | scmd->sc_data_direction = DMA_BIDIRECTIONAL; | |
1da177e4 | 2010 | |
d7a1bb0a JS |
2011 | spin_lock_irqsave(shost->host_lock, flags); |
2012 | shost->tmf_in_progress = 1; | |
2013 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2014 | ||
1da177e4 LT |
2015 | switch (flag) { |
2016 | case SCSI_TRY_RESET_DEVICE: | |
2017 | rtn = scsi_try_bus_device_reset(scmd); | |
2018 | if (rtn == SUCCESS) | |
2019 | break; | |
2020 | /* FALLTHROUGH */ | |
30bd7df8 MC |
2021 | case SCSI_TRY_RESET_TARGET: |
2022 | rtn = scsi_try_target_reset(scmd); | |
2023 | if (rtn == SUCCESS) | |
2024 | break; | |
2025 | /* FALLTHROUGH */ | |
1da177e4 LT |
2026 | case SCSI_TRY_RESET_BUS: |
2027 | rtn = scsi_try_bus_reset(scmd); | |
2028 | if (rtn == SUCCESS) | |
2029 | break; | |
2030 | /* FALLTHROUGH */ | |
2031 | case SCSI_TRY_RESET_HOST: | |
2032 | rtn = scsi_try_host_reset(scmd); | |
2033 | break; | |
2034 | default: | |
2035 | rtn = FAILED; | |
2036 | } | |
2037 | ||
d7a1bb0a JS |
2038 | spin_lock_irqsave(shost->host_lock, flags); |
2039 | shost->tmf_in_progress = 0; | |
2040 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2041 | ||
2042 | /* | |
2043 | * be sure to wake up anyone who was sleeping or had their queue | |
2044 | * suspended while we performed the TMF. | |
2045 | */ | |
2046 | SCSI_LOG_ERROR_RECOVERY(3, | |
2047 | printk("%s: waking up host to restart after TMF\n", | |
cadbd4a5 | 2048 | __func__)); |
d7a1bb0a JS |
2049 | |
2050 | wake_up(&shost->host_wait); | |
2051 | ||
2052 | scsi_run_host_queues(shost); | |
2053 | ||
1da177e4 | 2054 | scsi_next_command(scmd); |
bc4f2401 | 2055 | scsi_autopm_put_host(shost); |
1da177e4 LT |
2056 | return rtn; |
2057 | } | |
2058 | EXPORT_SYMBOL(scsi_reset_provider); | |
2059 | ||
2060 | /** | |
2061 | * scsi_normalize_sense - normalize main elements from either fixed or | |
2062 | * descriptor sense data format into a common format. | |
2063 | * | |
2064 | * @sense_buffer: byte array containing sense data returned by device | |
2065 | * @sb_len: number of valid bytes in sense_buffer | |
2066 | * @sshdr: pointer to instance of structure that common | |
2067 | * elements are written to. | |
2068 | * | |
2069 | * Notes: | |
2070 | * The "main elements" from sense data are: response_code, sense_key, | |
2071 | * asc, ascq and additional_length (only for descriptor format). | |
2072 | * | |
2073 | * Typically this function can be called after a device has | |
2074 | * responded to a SCSI command with the CHECK_CONDITION status. | |
2075 | * | |
2076 | * Return value: | |
2077 | * 1 if valid sense data information found, else 0; | |
dc8875e1 | 2078 | */ |
1da177e4 LT |
2079 | int scsi_normalize_sense(const u8 *sense_buffer, int sb_len, |
2080 | struct scsi_sense_hdr *sshdr) | |
2081 | { | |
33aa687d | 2082 | if (!sense_buffer || !sb_len) |
1da177e4 LT |
2083 | return 0; |
2084 | ||
2085 | memset(sshdr, 0, sizeof(struct scsi_sense_hdr)); | |
2086 | ||
2087 | sshdr->response_code = (sense_buffer[0] & 0x7f); | |
33aa687d JB |
2088 | |
2089 | if (!scsi_sense_valid(sshdr)) | |
2090 | return 0; | |
2091 | ||
1da177e4 LT |
2092 | if (sshdr->response_code >= 0x72) { |
2093 | /* | |
2094 | * descriptor format | |
2095 | */ | |
2096 | if (sb_len > 1) | |
2097 | sshdr->sense_key = (sense_buffer[1] & 0xf); | |
2098 | if (sb_len > 2) | |
2099 | sshdr->asc = sense_buffer[2]; | |
2100 | if (sb_len > 3) | |
2101 | sshdr->ascq = sense_buffer[3]; | |
2102 | if (sb_len > 7) | |
2103 | sshdr->additional_length = sense_buffer[7]; | |
2104 | } else { | |
0bf8c869 | 2105 | /* |
1da177e4 LT |
2106 | * fixed format |
2107 | */ | |
2108 | if (sb_len > 2) | |
2109 | sshdr->sense_key = (sense_buffer[2] & 0xf); | |
2110 | if (sb_len > 7) { | |
2111 | sb_len = (sb_len < (sense_buffer[7] + 8)) ? | |
2112 | sb_len : (sense_buffer[7] + 8); | |
2113 | if (sb_len > 12) | |
2114 | sshdr->asc = sense_buffer[12]; | |
2115 | if (sb_len > 13) | |
2116 | sshdr->ascq = sense_buffer[13]; | |
2117 | } | |
2118 | } | |
2119 | ||
2120 | return 1; | |
2121 | } | |
2122 | EXPORT_SYMBOL(scsi_normalize_sense); | |
2123 | ||
1da177e4 LT |
2124 | int scsi_command_normalize_sense(struct scsi_cmnd *cmd, |
2125 | struct scsi_sense_hdr *sshdr) | |
2126 | { | |
2127 | return scsi_normalize_sense(cmd->sense_buffer, | |
b80ca4f7 | 2128 | SCSI_SENSE_BUFFERSIZE, sshdr); |
1da177e4 LT |
2129 | } |
2130 | EXPORT_SYMBOL(scsi_command_normalize_sense); | |
2131 | ||
2132 | /** | |
eb44820c | 2133 | * scsi_sense_desc_find - search for a given descriptor type in descriptor sense data format. |
1da177e4 LT |
2134 | * @sense_buffer: byte array of descriptor format sense data |
2135 | * @sb_len: number of valid bytes in sense_buffer | |
2136 | * @desc_type: value of descriptor type to find | |
2137 | * (e.g. 0 -> information) | |
2138 | * | |
2139 | * Notes: | |
2140 | * only valid when sense data is in descriptor format | |
2141 | * | |
2142 | * Return value: | |
2143 | * pointer to start of (first) descriptor if found else NULL | |
dc8875e1 | 2144 | */ |
1da177e4 LT |
2145 | const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len, |
2146 | int desc_type) | |
2147 | { | |
2148 | int add_sen_len, add_len, desc_len, k; | |
2149 | const u8 * descp; | |
2150 | ||
2151 | if ((sb_len < 8) || (0 == (add_sen_len = sense_buffer[7]))) | |
2152 | return NULL; | |
2153 | if ((sense_buffer[0] < 0x72) || (sense_buffer[0] > 0x73)) | |
2154 | return NULL; | |
2155 | add_sen_len = (add_sen_len < (sb_len - 8)) ? | |
2156 | add_sen_len : (sb_len - 8); | |
2157 | descp = &sense_buffer[8]; | |
2158 | for (desc_len = 0, k = 0; k < add_sen_len; k += desc_len) { | |
2159 | descp += desc_len; | |
2160 | add_len = (k < (add_sen_len - 1)) ? descp[1]: -1; | |
2161 | desc_len = add_len + 2; | |
2162 | if (descp[0] == desc_type) | |
2163 | return descp; | |
2164 | if (add_len < 0) // short descriptor ?? | |
2165 | break; | |
2166 | } | |
2167 | return NULL; | |
2168 | } | |
2169 | EXPORT_SYMBOL(scsi_sense_desc_find); | |
2170 | ||
2171 | /** | |
eb44820c | 2172 | * scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor format) |
1da177e4 LT |
2173 | * @sense_buffer: byte array of sense data |
2174 | * @sb_len: number of valid bytes in sense_buffer | |
2175 | * @info_out: pointer to 64 integer where 8 or 4 byte information | |
2176 | * field will be placed if found. | |
2177 | * | |
2178 | * Return value: | |
2179 | * 1 if information field found, 0 if not found. | |
dc8875e1 | 2180 | */ |
1da177e4 LT |
2181 | int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len, |
2182 | u64 * info_out) | |
2183 | { | |
2184 | int j; | |
2185 | const u8 * ucp; | |
2186 | u64 ull; | |
2187 | ||
2188 | if (sb_len < 7) | |
2189 | return 0; | |
2190 | switch (sense_buffer[0] & 0x7f) { | |
2191 | case 0x70: | |
2192 | case 0x71: | |
2193 | if (sense_buffer[0] & 0x80) { | |
2194 | *info_out = (sense_buffer[3] << 24) + | |
2195 | (sense_buffer[4] << 16) + | |
2196 | (sense_buffer[5] << 8) + sense_buffer[6]; | |
2197 | return 1; | |
2198 | } else | |
2199 | return 0; | |
2200 | case 0x72: | |
2201 | case 0x73: | |
2202 | ucp = scsi_sense_desc_find(sense_buffer, sb_len, | |
2203 | 0 /* info desc */); | |
2204 | if (ucp && (0xa == ucp[1])) { | |
2205 | ull = 0; | |
2206 | for (j = 0; j < 8; ++j) { | |
2207 | if (j > 0) | |
2208 | ull <<= 8; | |
2209 | ull |= ucp[4 + j]; | |
2210 | } | |
2211 | *info_out = ull; | |
2212 | return 1; | |
2213 | } else | |
2214 | return 0; | |
2215 | default: | |
2216 | return 0; | |
2217 | } | |
2218 | } | |
2219 | EXPORT_SYMBOL(scsi_get_sense_info_fld); | |
3bc6a261 FT |
2220 | |
2221 | /** | |
2222 | * scsi_build_sense_buffer - build sense data in a buffer | |
2223 | * @desc: Sense format (non zero == descriptor format, | |
2224 | * 0 == fixed format) | |
2225 | * @buf: Where to build sense data | |
2226 | * @key: Sense key | |
2227 | * @asc: Additional sense code | |
2228 | * @ascq: Additional sense code qualifier | |
2229 | * | |
2230 | **/ | |
2231 | void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq) | |
2232 | { | |
2233 | if (desc) { | |
2234 | buf[0] = 0x72; /* descriptor, current */ | |
2235 | buf[1] = key; | |
2236 | buf[2] = asc; | |
2237 | buf[3] = ascq; | |
2238 | buf[7] = 0; | |
2239 | } else { | |
2240 | buf[0] = 0x70; /* fixed, current */ | |
2241 | buf[2] = key; | |
2242 | buf[7] = 0xa; | |
2243 | buf[12] = asc; | |
2244 | buf[13] = ascq; | |
2245 | } | |
2246 | } | |
2247 | EXPORT_SYMBOL(scsi_build_sense_buffer); |