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 | 89 | |
b4562022 HR |
90 | static int scsi_host_eh_past_deadline(struct Scsi_Host *shost) |
91 | { | |
92 | if (!shost->last_reset || !shost->eh_deadline) | |
93 | return 0; | |
94 | ||
95 | if (time_before(jiffies, | |
96 | shost->last_reset + shost->eh_deadline)) | |
97 | return 0; | |
98 | ||
99 | return 1; | |
100 | } | |
101 | ||
1da177e4 LT |
102 | /** |
103 | * scsi_eh_scmd_add - add scsi cmd to error handling. | |
104 | * @scmd: scmd to run eh on. | |
105 | * @eh_flag: optional SCSI_EH flag. | |
106 | * | |
107 | * Return value: | |
108 | * 0 on failure. | |
dc8875e1 | 109 | */ |
1da177e4 LT |
110 | int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag) |
111 | { | |
112 | struct Scsi_Host *shost = scmd->device->host; | |
113 | unsigned long flags; | |
939647ee | 114 | int ret = 0; |
1da177e4 | 115 | |
3ed7a470 | 116 | if (!shost->ehandler) |
1da177e4 LT |
117 | return 0; |
118 | ||
119 | spin_lock_irqsave(shost->host_lock, flags); | |
939647ee JB |
120 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) |
121 | if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) | |
122 | goto out_unlock; | |
1da177e4 | 123 | |
b4562022 HR |
124 | if (shost->eh_deadline && !shost->last_reset) |
125 | shost->last_reset = jiffies; | |
126 | ||
939647ee | 127 | ret = 1; |
3111b0d1 | 128 | scmd->eh_eflags |= eh_flag; |
1da177e4 | 129 | list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q); |
1da177e4 LT |
130 | shost->host_failed++; |
131 | scsi_eh_wakeup(shost); | |
939647ee | 132 | out_unlock: |
1da177e4 | 133 | spin_unlock_irqrestore(shost->host_lock, flags); |
939647ee | 134 | return ret; |
1da177e4 LT |
135 | } |
136 | ||
1da177e4 LT |
137 | /** |
138 | * scsi_times_out - Timeout function for normal scsi commands. | |
242f9dcb | 139 | * @req: request that is timing out. |
1da177e4 LT |
140 | * |
141 | * Notes: | |
142 | * We do not need to lock this. There is the potential for a race | |
143 | * only in that the normal completion handling might run, but if the | |
144 | * normal completion function determines that the timer has already | |
145 | * fired, then it mustn't do anything. | |
dc8875e1 | 146 | */ |
242f9dcb | 147 | enum blk_eh_timer_return scsi_times_out(struct request *req) |
1da177e4 | 148 | { |
242f9dcb | 149 | struct scsi_cmnd *scmd = req->special; |
242f9dcb | 150 | enum blk_eh_timer_return rtn = BLK_EH_NOT_HANDLED; |
0bf8c869 | 151 | struct Scsi_Host *host = scmd->device->host; |
6c5f8ce1 | 152 | |
bf816235 | 153 | trace_scsi_dispatch_cmd_timeout(scmd); |
1da177e4 LT |
154 | scsi_log_completion(scmd, TIMEOUT_ERROR); |
155 | ||
b4562022 HR |
156 | if (host->eh_deadline && !host->last_reset) |
157 | host->last_reset = jiffies; | |
158 | ||
0bf8c869 JJ |
159 | if (host->transportt->eh_timed_out) |
160 | rtn = host->transportt->eh_timed_out(scmd); | |
161 | else if (host->hostt->eh_timed_out) | |
162 | rtn = host->hostt->eh_timed_out(scmd); | |
1da177e4 | 163 | |
18a4d0a2 MP |
164 | scmd->result |= DID_TIME_OUT << 16; |
165 | ||
fa990781 | 166 | if (unlikely(rtn == BLK_EH_NOT_HANDLED && |
18a4d0a2 | 167 | !scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD))) |
fa990781 | 168 | rtn = BLK_EH_HANDLED; |
242f9dcb | 169 | |
fa990781 | 170 | return rtn; |
1da177e4 LT |
171 | } |
172 | ||
173 | /** | |
174 | * scsi_block_when_processing_errors - Prevent cmds from being queued. | |
175 | * @sdev: Device on which we are performing recovery. | |
176 | * | |
177 | * Description: | |
178 | * We block until the host is out of error recovery, and then check to | |
179 | * see whether the host or the device is offline. | |
180 | * | |
181 | * Return value: | |
182 | * 0 when dev was taken offline by error recovery. 1 OK to proceed. | |
dc8875e1 | 183 | */ |
1da177e4 LT |
184 | int scsi_block_when_processing_errors(struct scsi_device *sdev) |
185 | { | |
186 | int online; | |
187 | ||
939647ee | 188 | wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host)); |
1da177e4 LT |
189 | |
190 | online = scsi_device_online(sdev); | |
191 | ||
cadbd4a5 | 192 | SCSI_LOG_ERROR_RECOVERY(5, printk("%s: rtn: %d\n", __func__, |
1da177e4 LT |
193 | online)); |
194 | ||
195 | return online; | |
196 | } | |
197 | EXPORT_SYMBOL(scsi_block_when_processing_errors); | |
198 | ||
199 | #ifdef CONFIG_SCSI_LOGGING | |
200 | /** | |
201 | * scsi_eh_prt_fail_stats - Log info on failures. | |
202 | * @shost: scsi host being recovered. | |
203 | * @work_q: Queue of scsi cmds to process. | |
dc8875e1 | 204 | */ |
1da177e4 LT |
205 | static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost, |
206 | struct list_head *work_q) | |
207 | { | |
208 | struct scsi_cmnd *scmd; | |
209 | struct scsi_device *sdev; | |
210 | int total_failures = 0; | |
211 | int cmd_failed = 0; | |
212 | int cmd_cancel = 0; | |
213 | int devices_failed = 0; | |
214 | ||
215 | shost_for_each_device(sdev, shost) { | |
216 | list_for_each_entry(scmd, work_q, eh_entry) { | |
217 | if (scmd->device == sdev) { | |
218 | ++total_failures; | |
3111b0d1 | 219 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) |
1da177e4 | 220 | ++cmd_cancel; |
0bf8c869 | 221 | else |
1da177e4 LT |
222 | ++cmd_failed; |
223 | } | |
224 | } | |
225 | ||
226 | if (cmd_cancel || cmd_failed) { | |
227 | SCSI_LOG_ERROR_RECOVERY(3, | |
9ccfc756 JB |
228 | sdev_printk(KERN_INFO, sdev, |
229 | "%s: cmds failed: %d, cancel: %d\n", | |
cadbd4a5 | 230 | __func__, cmd_failed, |
9ccfc756 | 231 | cmd_cancel)); |
1da177e4 LT |
232 | cmd_cancel = 0; |
233 | cmd_failed = 0; | |
234 | ++devices_failed; | |
235 | } | |
236 | } | |
237 | ||
238 | SCSI_LOG_ERROR_RECOVERY(2, printk("Total of %d commands on %d" | |
239 | " devices require eh work\n", | |
0bf8c869 | 240 | total_failures, devices_failed)); |
1da177e4 LT |
241 | } |
242 | #endif | |
243 | ||
279afdfe EM |
244 | /** |
245 | * scsi_report_lun_change - Set flag on all *other* devices on the same target | |
246 | * to indicate that a UNIT ATTENTION is expected. | |
247 | * @sdev: Device reporting the UNIT ATTENTION | |
248 | */ | |
249 | static void scsi_report_lun_change(struct scsi_device *sdev) | |
250 | { | |
251 | sdev->sdev_target->expecting_lun_change = 1; | |
252 | } | |
253 | ||
254 | /** | |
255 | * scsi_report_sense - Examine scsi sense information and log messages for | |
256 | * certain conditions, also issue uevents for some of them. | |
257 | * @sdev: Device reporting the sense code | |
258 | * @sshdr: sshdr to be examined | |
259 | */ | |
260 | static void scsi_report_sense(struct scsi_device *sdev, | |
261 | struct scsi_sense_hdr *sshdr) | |
262 | { | |
263 | enum scsi_device_event evt_type = SDEV_EVT_MAXBITS; /* i.e. none */ | |
264 | ||
265 | if (sshdr->sense_key == UNIT_ATTENTION) { | |
266 | if (sshdr->asc == 0x3f && sshdr->ascq == 0x03) { | |
267 | evt_type = SDEV_EVT_INQUIRY_CHANGE_REPORTED; | |
268 | sdev_printk(KERN_WARNING, sdev, | |
269 | "Inquiry data has changed"); | |
270 | } else if (sshdr->asc == 0x3f && sshdr->ascq == 0x0e) { | |
271 | evt_type = SDEV_EVT_LUN_CHANGE_REPORTED; | |
272 | scsi_report_lun_change(sdev); | |
273 | sdev_printk(KERN_WARNING, sdev, | |
274 | "Warning! Received an indication that the " | |
275 | "LUN assignments on this target have " | |
276 | "changed. The Linux SCSI layer does not " | |
277 | "automatically remap LUN assignments.\n"); | |
278 | } else if (sshdr->asc == 0x3f) | |
279 | sdev_printk(KERN_WARNING, sdev, | |
280 | "Warning! Received an indication that the " | |
281 | "operating parameters on this target have " | |
282 | "changed. The Linux SCSI layer does not " | |
283 | "automatically adjust these parameters.\n"); | |
284 | ||
285 | if (sshdr->asc == 0x38 && sshdr->ascq == 0x07) { | |
286 | evt_type = SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED; | |
287 | sdev_printk(KERN_WARNING, sdev, | |
288 | "Warning! Received an indication that the " | |
289 | "LUN reached a thin provisioning soft " | |
290 | "threshold.\n"); | |
291 | } | |
292 | ||
293 | if (sshdr->asc == 0x2a && sshdr->ascq == 0x01) { | |
294 | evt_type = SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED; | |
295 | sdev_printk(KERN_WARNING, sdev, | |
296 | "Mode parameters changed"); | |
297 | } else if (sshdr->asc == 0x2a && sshdr->ascq == 0x09) { | |
298 | evt_type = SDEV_EVT_CAPACITY_CHANGE_REPORTED; | |
299 | sdev_printk(KERN_WARNING, sdev, | |
300 | "Capacity data has changed"); | |
301 | } else if (sshdr->asc == 0x2a) | |
302 | sdev_printk(KERN_WARNING, sdev, | |
303 | "Parameters changed"); | |
304 | } | |
305 | ||
306 | if (evt_type != SDEV_EVT_MAXBITS) { | |
307 | set_bit(evt_type, sdev->pending_events); | |
308 | schedule_work(&sdev->event_work); | |
309 | } | |
310 | } | |
311 | ||
1da177e4 LT |
312 | /** |
313 | * scsi_check_sense - Examine scsi cmd sense | |
314 | * @scmd: Cmd to have sense checked. | |
315 | * | |
316 | * Return value: | |
87f14e65 | 317 | * SUCCESS or FAILED or NEEDS_RETRY or ADD_TO_MLQUEUE |
1da177e4 LT |
318 | * |
319 | * Notes: | |
320 | * When a deferred error is detected the current command has | |
321 | * not been executed and needs retrying. | |
dc8875e1 | 322 | */ |
1da177e4 LT |
323 | static int scsi_check_sense(struct scsi_cmnd *scmd) |
324 | { | |
a6a8d9f8 | 325 | struct scsi_device *sdev = scmd->device; |
1da177e4 LT |
326 | struct scsi_sense_hdr sshdr; |
327 | ||
328 | if (! scsi_command_normalize_sense(scmd, &sshdr)) | |
329 | return FAILED; /* no valid sense data */ | |
330 | ||
14216561 JB |
331 | if (scmd->cmnd[0] == TEST_UNIT_READY && scmd->scsi_done != scsi_eh_done) |
332 | /* | |
333 | * nasty: for mid-layer issued TURs, we need to return the | |
334 | * actual sense data without any recovery attempt. For eh | |
335 | * issued ones, we need to try to recover and interpret | |
336 | */ | |
337 | return SUCCESS; | |
338 | ||
279afdfe EM |
339 | scsi_report_sense(sdev, &sshdr); |
340 | ||
1da177e4 LT |
341 | if (scsi_sense_is_deferred(&sshdr)) |
342 | return NEEDS_RETRY; | |
343 | ||
a6a8d9f8 CS |
344 | if (sdev->scsi_dh_data && sdev->scsi_dh_data->scsi_dh && |
345 | sdev->scsi_dh_data->scsi_dh->check_sense) { | |
346 | int rc; | |
347 | ||
348 | rc = sdev->scsi_dh_data->scsi_dh->check_sense(sdev, &sshdr); | |
349 | if (rc != SCSI_RETURN_NOT_HANDLED) | |
350 | return rc; | |
351 | /* handler does not care. Drop down to default handling */ | |
352 | } | |
353 | ||
1da177e4 LT |
354 | /* |
355 | * Previous logic looked for FILEMARK, EOM or ILI which are | |
356 | * mainly associated with tapes and returned SUCCESS. | |
357 | */ | |
358 | if (sshdr.response_code == 0x70) { | |
359 | /* fixed format */ | |
360 | if (scmd->sense_buffer[2] & 0xe0) | |
361 | return SUCCESS; | |
362 | } else { | |
363 | /* | |
364 | * descriptor format: look for "stream commands sense data | |
365 | * descriptor" (see SSC-3). Assume single sense data | |
366 | * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG. | |
367 | */ | |
368 | if ((sshdr.additional_length > 3) && | |
369 | (scmd->sense_buffer[8] == 0x4) && | |
370 | (scmd->sense_buffer[11] & 0xe0)) | |
371 | return SUCCESS; | |
372 | } | |
373 | ||
374 | switch (sshdr.sense_key) { | |
375 | case NO_SENSE: | |
376 | return SUCCESS; | |
377 | case RECOVERED_ERROR: | |
378 | return /* soft_error */ SUCCESS; | |
379 | ||
380 | case ABORTED_COMMAND: | |
511e44f4 MP |
381 | if (sshdr.asc == 0x10) /* DIF */ |
382 | return SUCCESS; | |
383 | ||
1da177e4 LT |
384 | return NEEDS_RETRY; |
385 | case NOT_READY: | |
386 | case UNIT_ATTENTION: | |
387 | /* | |
388 | * if we are expecting a cc/ua because of a bus reset that we | |
389 | * performed, treat this just as a retry. otherwise this is | |
390 | * information that we should pass up to the upper-level driver | |
391 | * so that we can deal with it there. | |
392 | */ | |
393 | if (scmd->device->expecting_cc_ua) { | |
dfcf7775 TH |
394 | /* |
395 | * Because some device does not queue unit | |
396 | * attentions correctly, we carefully check | |
397 | * additional sense code and qualifier so as | |
398 | * not to squash media change unit attention. | |
399 | */ | |
400 | if (sshdr.asc != 0x28 || sshdr.ascq != 0x00) { | |
401 | scmd->device->expecting_cc_ua = 0; | |
402 | return NEEDS_RETRY; | |
403 | } | |
1da177e4 | 404 | } |
279afdfe EM |
405 | /* |
406 | * we might also expect a cc/ua if another LUN on the target | |
407 | * reported a UA with an ASC/ASCQ of 3F 0E - | |
408 | * REPORTED LUNS DATA HAS CHANGED. | |
409 | */ | |
410 | if (scmd->device->sdev_target->expecting_lun_change && | |
411 | sshdr.asc == 0x3f && sshdr.ascq == 0x0e) | |
412 | return NEEDS_RETRY; | |
1da177e4 | 413 | /* |
0bf8c869 | 414 | * if the device is in the process of becoming ready, we |
1da177e4 LT |
415 | * should retry. |
416 | */ | |
417 | if ((sshdr.asc == 0x04) && (sshdr.ascq == 0x01)) | |
418 | return NEEDS_RETRY; | |
419 | /* | |
420 | * if the device is not started, we need to wake | |
421 | * the error handler to start the motor | |
422 | */ | |
423 | if (scmd->device->allow_restart && | |
424 | (sshdr.asc == 0x04) && (sshdr.ascq == 0x02)) | |
425 | return FAILED; | |
02e031cb CH |
426 | /* |
427 | * Pass the UA upwards for a determination in the completion | |
428 | * functions. | |
429 | */ | |
430 | return SUCCESS; | |
1da177e4 | 431 | |
63583cca | 432 | /* these are not supported */ |
a9d6ceb8 HR |
433 | case DATA_PROTECT: |
434 | if (sshdr.asc == 0x27 && sshdr.ascq == 0x07) { | |
435 | /* Thin provisioning hard threshold reached */ | |
436 | set_host_byte(scmd, DID_ALLOC_FAILURE); | |
437 | return SUCCESS; | |
438 | } | |
1da177e4 LT |
439 | case COPY_ABORTED: |
440 | case VOLUME_OVERFLOW: | |
441 | case MISCOMPARE: | |
63583cca | 442 | case BLANK_CHECK: |
87f14e65 HR |
443 | set_host_byte(scmd, DID_TARGET_FAILURE); |
444 | return SUCCESS; | |
1da177e4 LT |
445 | |
446 | case MEDIUM_ERROR: | |
fd1b494d LT |
447 | if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */ |
448 | sshdr.asc == 0x13 || /* AMNF DATA FIELD */ | |
449 | sshdr.asc == 0x14) { /* RECORD NOT FOUND */ | |
7e782af5 | 450 | set_host_byte(scmd, DID_MEDIUM_ERROR); |
87f14e65 | 451 | return SUCCESS; |
fd1b494d | 452 | } |
1da177e4 LT |
453 | return NEEDS_RETRY; |
454 | ||
455 | case HARDWARE_ERROR: | |
456 | if (scmd->device->retry_hwerror) | |
bb0003c1 | 457 | return ADD_TO_MLQUEUE; |
1da177e4 | 458 | else |
87f14e65 | 459 | set_host_byte(scmd, DID_TARGET_FAILURE); |
1da177e4 LT |
460 | |
461 | case ILLEGAL_REQUEST: | |
47ac56db MS |
462 | if (sshdr.asc == 0x20 || /* Invalid command operation code */ |
463 | sshdr.asc == 0x21 || /* Logical block address out of range */ | |
464 | sshdr.asc == 0x24 || /* Invalid field in cdb */ | |
465 | sshdr.asc == 0x26) { /* Parameter value invalid */ | |
87f14e65 | 466 | set_host_byte(scmd, DID_TARGET_FAILURE); |
47ac56db MS |
467 | } |
468 | return SUCCESS; | |
469 | ||
1da177e4 LT |
470 | default: |
471 | return SUCCESS; | |
472 | } | |
473 | } | |
474 | ||
4a84067d VD |
475 | static void scsi_handle_queue_ramp_up(struct scsi_device *sdev) |
476 | { | |
477 | struct scsi_host_template *sht = sdev->host->hostt; | |
478 | struct scsi_device *tmp_sdev; | |
479 | ||
480 | if (!sht->change_queue_depth || | |
481 | sdev->queue_depth >= sdev->max_queue_depth) | |
482 | return; | |
483 | ||
484 | if (time_before(jiffies, | |
485 | sdev->last_queue_ramp_up + sdev->queue_ramp_up_period)) | |
486 | return; | |
487 | ||
488 | if (time_before(jiffies, | |
489 | sdev->last_queue_full_time + sdev->queue_ramp_up_period)) | |
490 | return; | |
491 | ||
492 | /* | |
493 | * Walk all devices of a target and do | |
494 | * ramp up on them. | |
495 | */ | |
496 | shost_for_each_device(tmp_sdev, sdev->host) { | |
497 | if (tmp_sdev->channel != sdev->channel || | |
498 | tmp_sdev->id != sdev->id || | |
499 | tmp_sdev->queue_depth == sdev->max_queue_depth) | |
500 | continue; | |
501 | /* | |
502 | * call back into LLD to increase queue_depth by one | |
503 | * with ramp up reason code. | |
504 | */ | |
505 | sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1, | |
506 | SCSI_QDEPTH_RAMP_UP); | |
507 | sdev->last_queue_ramp_up = jiffies; | |
508 | } | |
509 | } | |
510 | ||
42a6a918 MC |
511 | static void scsi_handle_queue_full(struct scsi_device *sdev) |
512 | { | |
513 | struct scsi_host_template *sht = sdev->host->hostt; | |
514 | struct scsi_device *tmp_sdev; | |
515 | ||
516 | if (!sht->change_queue_depth) | |
517 | return; | |
518 | ||
519 | shost_for_each_device(tmp_sdev, sdev->host) { | |
520 | if (tmp_sdev->channel != sdev->channel || | |
521 | tmp_sdev->id != sdev->id) | |
522 | continue; | |
523 | /* | |
524 | * We do not know the number of commands that were at | |
525 | * the device when we got the queue full so we start | |
526 | * from the highest possible value and work our way down. | |
527 | */ | |
528 | sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth - 1, | |
529 | SCSI_QDEPTH_QFULL); | |
530 | } | |
531 | } | |
532 | ||
1da177e4 LT |
533 | /** |
534 | * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD. | |
535 | * @scmd: SCSI cmd to examine. | |
536 | * | |
537 | * Notes: | |
538 | * This is *only* called when we are examining the status of commands | |
539 | * queued during error recovery. the main difference here is that we | |
540 | * don't allow for the possibility of retries here, and we are a lot | |
541 | * more restrictive about what we consider acceptable. | |
dc8875e1 | 542 | */ |
1da177e4 LT |
543 | static int scsi_eh_completed_normally(struct scsi_cmnd *scmd) |
544 | { | |
545 | /* | |
546 | * first check the host byte, to see if there is anything in there | |
547 | * that would indicate what we need to do. | |
548 | */ | |
549 | if (host_byte(scmd->result) == DID_RESET) { | |
550 | /* | |
551 | * rats. we are already in the error handler, so we now | |
552 | * get to try and figure out what to do next. if the sense | |
553 | * is valid, we have a pretty good idea of what to do. | |
554 | * if not, we mark it as FAILED. | |
555 | */ | |
556 | return scsi_check_sense(scmd); | |
557 | } | |
558 | if (host_byte(scmd->result) != DID_OK) | |
559 | return FAILED; | |
560 | ||
561 | /* | |
562 | * next, check the message byte. | |
563 | */ | |
564 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
565 | return FAILED; | |
566 | ||
567 | /* | |
568 | * now, check the status byte to see if this indicates | |
569 | * anything special. | |
570 | */ | |
571 | switch (status_byte(scmd->result)) { | |
572 | case GOOD: | |
4a84067d | 573 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 LT |
574 | case COMMAND_TERMINATED: |
575 | return SUCCESS; | |
576 | case CHECK_CONDITION: | |
577 | return scsi_check_sense(scmd); | |
578 | case CONDITION_GOOD: | |
579 | case INTERMEDIATE_GOOD: | |
580 | case INTERMEDIATE_C_GOOD: | |
581 | /* | |
582 | * who knows? FIXME(eric) | |
583 | */ | |
584 | return SUCCESS; | |
5f91bb05 | 585 | case RESERVATION_CONFLICT: |
67110dfd JB |
586 | if (scmd->cmnd[0] == TEST_UNIT_READY) |
587 | /* it is a success, we probed the device and | |
588 | * found it */ | |
589 | return SUCCESS; | |
590 | /* otherwise, we failed to send the command */ | |
591 | return FAILED; | |
1da177e4 | 592 | case QUEUE_FULL: |
42a6a918 MC |
593 | scsi_handle_queue_full(scmd->device); |
594 | /* fall through */ | |
595 | case BUSY: | |
3eb3a928 | 596 | return NEEDS_RETRY; |
1da177e4 LT |
597 | default: |
598 | return FAILED; | |
599 | } | |
600 | return FAILED; | |
601 | } | |
602 | ||
1da177e4 LT |
603 | /** |
604 | * scsi_eh_done - Completion function for error handling. | |
605 | * @scmd: Cmd that is done. | |
dc8875e1 | 606 | */ |
1da177e4 LT |
607 | static void scsi_eh_done(struct scsi_cmnd *scmd) |
608 | { | |
0bf8c869 | 609 | struct completion *eh_action; |
85631672 | 610 | |
7dfdc9a5 CH |
611 | SCSI_LOG_ERROR_RECOVERY(3, |
612 | printk("%s scmd: %p result: %x\n", | |
cadbd4a5 | 613 | __func__, scmd, scmd->result)); |
85631672 MR |
614 | |
615 | eh_action = scmd->device->host->eh_action; | |
616 | if (eh_action) | |
617 | complete(eh_action); | |
1da177e4 LT |
618 | } |
619 | ||
292148f8 BK |
620 | /** |
621 | * scsi_try_host_reset - ask host adapter to reset itself | |
c2b3ebd0 | 622 | * @scmd: SCSI cmd to send host reset. |
dc8875e1 | 623 | */ |
292148f8 BK |
624 | static int scsi_try_host_reset(struct scsi_cmnd *scmd) |
625 | { | |
626 | unsigned long flags; | |
627 | int rtn; | |
0bf8c869 JJ |
628 | struct Scsi_Host *host = scmd->device->host; |
629 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 BK |
630 | |
631 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Host RST\n", | |
cadbd4a5 | 632 | __func__)); |
292148f8 | 633 | |
0bf8c869 | 634 | if (!hostt->eh_host_reset_handler) |
292148f8 BK |
635 | return FAILED; |
636 | ||
0bf8c869 | 637 | rtn = hostt->eh_host_reset_handler(scmd); |
292148f8 BK |
638 | |
639 | if (rtn == SUCCESS) { | |
0bf8c869 | 640 | if (!hostt->skip_settle_delay) |
292148f8 | 641 | ssleep(HOST_RESET_SETTLE_TIME); |
0bf8c869 JJ |
642 | spin_lock_irqsave(host->host_lock, flags); |
643 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
644 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
645 | } |
646 | ||
647 | return rtn; | |
648 | } | |
649 | ||
650 | /** | |
651 | * scsi_try_bus_reset - ask host to perform a bus reset | |
652 | * @scmd: SCSI cmd to send bus reset. | |
dc8875e1 | 653 | */ |
292148f8 BK |
654 | static int scsi_try_bus_reset(struct scsi_cmnd *scmd) |
655 | { | |
656 | unsigned long flags; | |
657 | int rtn; | |
0bf8c869 JJ |
658 | struct Scsi_Host *host = scmd->device->host; |
659 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 BK |
660 | |
661 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Bus RST\n", | |
cadbd4a5 | 662 | __func__)); |
292148f8 | 663 | |
0bf8c869 | 664 | if (!hostt->eh_bus_reset_handler) |
292148f8 BK |
665 | return FAILED; |
666 | ||
0bf8c869 | 667 | rtn = hostt->eh_bus_reset_handler(scmd); |
292148f8 BK |
668 | |
669 | if (rtn == SUCCESS) { | |
0bf8c869 | 670 | if (!hostt->skip_settle_delay) |
292148f8 | 671 | ssleep(BUS_RESET_SETTLE_TIME); |
0bf8c869 JJ |
672 | spin_lock_irqsave(host->host_lock, flags); |
673 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
674 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
675 | } |
676 | ||
677 | return rtn; | |
678 | } | |
679 | ||
30bd7df8 MC |
680 | static void __scsi_report_device_reset(struct scsi_device *sdev, void *data) |
681 | { | |
682 | sdev->was_reset = 1; | |
683 | sdev->expecting_cc_ua = 1; | |
684 | } | |
685 | ||
686 | /** | |
687 | * scsi_try_target_reset - Ask host to perform a target reset | |
688 | * @scmd: SCSI cmd used to send a target reset | |
689 | * | |
690 | * Notes: | |
691 | * There is no timeout for this operation. if this operation is | |
692 | * unreliable for a given host, then the host itself needs to put a | |
693 | * timer on it, and set the host back to a consistent state prior to | |
694 | * returning. | |
695 | */ | |
696 | static int scsi_try_target_reset(struct scsi_cmnd *scmd) | |
697 | { | |
698 | unsigned long flags; | |
699 | int rtn; | |
0bf8c869 JJ |
700 | struct Scsi_Host *host = scmd->device->host; |
701 | struct scsi_host_template *hostt = host->hostt; | |
30bd7df8 | 702 | |
0bf8c869 | 703 | if (!hostt->eh_target_reset_handler) |
30bd7df8 MC |
704 | return FAILED; |
705 | ||
0bf8c869 | 706 | rtn = hostt->eh_target_reset_handler(scmd); |
30bd7df8 | 707 | if (rtn == SUCCESS) { |
0bf8c869 | 708 | spin_lock_irqsave(host->host_lock, flags); |
30bd7df8 MC |
709 | __starget_for_each_device(scsi_target(scmd->device), NULL, |
710 | __scsi_report_device_reset); | |
0bf8c869 | 711 | spin_unlock_irqrestore(host->host_lock, flags); |
30bd7df8 MC |
712 | } |
713 | ||
714 | return rtn; | |
715 | } | |
716 | ||
292148f8 BK |
717 | /** |
718 | * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev | |
719 | * @scmd: SCSI cmd used to send BDR | |
720 | * | |
721 | * Notes: | |
722 | * There is no timeout for this operation. if this operation is | |
723 | * unreliable for a given host, then the host itself needs to put a | |
724 | * timer on it, and set the host back to a consistent state prior to | |
725 | * returning. | |
dc8875e1 | 726 | */ |
292148f8 BK |
727 | static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd) |
728 | { | |
729 | int rtn; | |
0bf8c869 | 730 | struct scsi_host_template *hostt = scmd->device->host->hostt; |
292148f8 | 731 | |
0bf8c869 | 732 | if (!hostt->eh_device_reset_handler) |
292148f8 BK |
733 | return FAILED; |
734 | ||
0bf8c869 | 735 | rtn = hostt->eh_device_reset_handler(scmd); |
30bd7df8 MC |
736 | if (rtn == SUCCESS) |
737 | __scsi_report_device_reset(scmd->device, NULL); | |
292148f8 BK |
738 | return rtn; |
739 | } | |
740 | ||
0bf8c869 | 741 | static int scsi_try_to_abort_cmd(struct scsi_host_template *hostt, struct scsi_cmnd *scmd) |
292148f8 | 742 | { |
0bf8c869 | 743 | if (!hostt->eh_abort_handler) |
292148f8 BK |
744 | return FAILED; |
745 | ||
0bf8c869 | 746 | return hostt->eh_abort_handler(scmd); |
292148f8 BK |
747 | } |
748 | ||
292148f8 BK |
749 | static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd) |
750 | { | |
0bf8c869 | 751 | if (scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd) != SUCCESS) |
292148f8 | 752 | if (scsi_try_bus_device_reset(scmd) != SUCCESS) |
30bd7df8 MC |
753 | if (scsi_try_target_reset(scmd) != SUCCESS) |
754 | if (scsi_try_bus_reset(scmd) != SUCCESS) | |
755 | scsi_try_host_reset(scmd); | |
292148f8 BK |
756 | } |
757 | ||
1da177e4 | 758 | /** |
3b729f76 | 759 | * scsi_eh_prep_cmnd - Save a scsi command info as part of error recovery |
2dc611de | 760 | * @scmd: SCSI command structure to hijack |
e1c23468 | 761 | * @ses: structure to save restore information |
55db6c1b | 762 | * @cmnd: CDB to send. Can be NULL if no new cmnd is needed |
64a87b24 | 763 | * @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB) |
55db6c1b | 764 | * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored) |
2dc611de | 765 | * |
e1c23468 | 766 | * This function is used to save a scsi command information before re-execution |
55db6c1b BH |
767 | * as part of the error recovery process. If @sense_bytes is 0 the command |
768 | * sent must be one that does not transfer any data. If @sense_bytes != 0 | |
769 | * @cmnd is ignored and this functions sets up a REQUEST_SENSE command | |
770 | * and cmnd buffers to read @sense_bytes into @scmd->sense_buffer. | |
dc8875e1 | 771 | */ |
e1c23468 BH |
772 | void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, |
773 | unsigned char *cmnd, int cmnd_size, unsigned sense_bytes) | |
1da177e4 | 774 | { |
f59114b7 | 775 | struct scsi_device *sdev = scmd->device; |
1da177e4 | 776 | |
631c228c CH |
777 | /* |
778 | * We need saved copies of a number of fields - this is because | |
779 | * error handling may need to overwrite these with different values | |
780 | * to run different commands, and once error handling is complete, | |
781 | * we will need to restore these values prior to running the actual | |
782 | * command. | |
783 | */ | |
e1c23468 | 784 | ses->cmd_len = scmd->cmd_len; |
64a87b24 | 785 | ses->cmnd = scmd->cmnd; |
e1c23468 | 786 | ses->data_direction = scmd->sc_data_direction; |
30b0c37b | 787 | ses->sdb = scmd->sdb; |
6f9a35e2 | 788 | ses->next_rq = scmd->request->next_rq; |
e1c23468 | 789 | ses->result = scmd->result; |
12265709 | 790 | ses->underflow = scmd->underflow; |
db007fc5 | 791 | ses->prot_op = scmd->prot_op; |
631c228c | 792 | |
db007fc5 | 793 | scmd->prot_op = SCSI_PROT_NORMAL; |
64a87b24 BH |
794 | scmd->cmnd = ses->eh_cmnd; |
795 | memset(scmd->cmnd, 0, BLK_MAX_CDB); | |
30b0c37b | 796 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
6f9a35e2 | 797 | scmd->request->next_rq = NULL; |
30b0c37b | 798 | |
55db6c1b | 799 | if (sense_bytes) { |
30b0c37b BH |
800 | scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE, |
801 | sense_bytes); | |
e1c23468 | 802 | sg_init_one(&ses->sense_sgl, scmd->sense_buffer, |
30b0c37b BH |
803 | scmd->sdb.length); |
804 | scmd->sdb.table.sgl = &ses->sense_sgl; | |
55db6c1b | 805 | scmd->sc_data_direction = DMA_FROM_DEVICE; |
30b0c37b | 806 | scmd->sdb.table.nents = 1; |
55db6c1b | 807 | scmd->cmnd[0] = REQUEST_SENSE; |
30b0c37b | 808 | scmd->cmnd[4] = scmd->sdb.length; |
55db6c1b | 809 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); |
631c228c | 810 | } else { |
631c228c | 811 | scmd->sc_data_direction = DMA_NONE; |
55db6c1b | 812 | if (cmnd) { |
64a87b24 | 813 | BUG_ON(cmnd_size > BLK_MAX_CDB); |
55db6c1b BH |
814 | memcpy(scmd->cmnd, cmnd, cmnd_size); |
815 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); | |
816 | } | |
631c228c CH |
817 | } |
818 | ||
819 | scmd->underflow = 0; | |
631c228c | 820 | |
55db6c1b | 821 | if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN) |
1da177e4 | 822 | scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) | |
f59114b7 | 823 | (sdev->lun << 5 & 0xe0); |
1da177e4 | 824 | |
631c228c CH |
825 | /* |
826 | * Zero the sense buffer. The scsi spec mandates that any | |
827 | * untransferred sense data should be interpreted as being zero. | |
828 | */ | |
b80ca4f7 | 829 | memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); |
e1c23468 BH |
830 | } |
831 | EXPORT_SYMBOL(scsi_eh_prep_cmnd); | |
832 | ||
833 | /** | |
3b729f76 | 834 | * scsi_eh_restore_cmnd - Restore a scsi command info as part of error recovery |
e1c23468 | 835 | * @scmd: SCSI command structure to restore |
477e608c | 836 | * @ses: saved information from a coresponding call to scsi_eh_prep_cmnd |
e1c23468 | 837 | * |
477e608c | 838 | * Undo any damage done by above scsi_eh_prep_cmnd(). |
dc8875e1 | 839 | */ |
e1c23468 BH |
840 | void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses) |
841 | { | |
842 | /* | |
843 | * Restore original data | |
844 | */ | |
845 | scmd->cmd_len = ses->cmd_len; | |
64a87b24 | 846 | scmd->cmnd = ses->cmnd; |
e1c23468 | 847 | scmd->sc_data_direction = ses->data_direction; |
30b0c37b | 848 | scmd->sdb = ses->sdb; |
6f9a35e2 | 849 | scmd->request->next_rq = ses->next_rq; |
e1c23468 | 850 | scmd->result = ses->result; |
12265709 | 851 | scmd->underflow = ses->underflow; |
db007fc5 | 852 | scmd->prot_op = ses->prot_op; |
e1c23468 BH |
853 | } |
854 | EXPORT_SYMBOL(scsi_eh_restore_cmnd); | |
631c228c | 855 | |
e1c23468 | 856 | /** |
3b729f76 | 857 | * scsi_send_eh_cmnd - submit a scsi command as part of error recovery |
e1c23468 BH |
858 | * @scmd: SCSI command structure to hijack |
859 | * @cmnd: CDB to send | |
860 | * @cmnd_size: size in bytes of @cmnd | |
861 | * @timeout: timeout for this request | |
862 | * @sense_bytes: size of sense data to copy or 0 | |
863 | * | |
864 | * This function is used to send a scsi command down to a target device | |
865 | * as part of the error recovery process. See also scsi_eh_prep_cmnd() above. | |
866 | * | |
867 | * Return value: | |
868 | * SUCCESS or FAILED or NEEDS_RETRY | |
dc8875e1 | 869 | */ |
e1c23468 BH |
870 | static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd, |
871 | int cmnd_size, int timeout, unsigned sense_bytes) | |
872 | { | |
873 | struct scsi_device *sdev = scmd->device; | |
874 | struct Scsi_Host *shost = sdev->host; | |
875 | DECLARE_COMPLETION_ONSTACK(done); | |
fc73648a | 876 | unsigned long timeleft = timeout; |
e1c23468 | 877 | struct scsi_eh_save ses; |
fc73648a | 878 | const unsigned long stall_for = msecs_to_jiffies(100); |
e1c23468 BH |
879 | int rtn; |
880 | ||
fc73648a | 881 | retry: |
e1c23468 | 882 | scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes); |
7dfdc9a5 | 883 | shost->eh_action = &done; |
1da177e4 | 884 | |
1da177e4 | 885 | scsi_log_send(scmd); |
f281233d | 886 | scmd->scsi_done = scsi_eh_done; |
fc73648a HR |
887 | rtn = shost->hostt->queuecommand(shost, scmd); |
888 | if (rtn) { | |
889 | if (timeleft > stall_for) { | |
890 | scsi_eh_restore_cmnd(scmd, &ses); | |
891 | timeleft -= stall_for; | |
892 | msleep(jiffies_to_msecs(stall_for)); | |
893 | goto retry; | |
894 | } | |
895 | /* signal not to enter either branch of the if () below */ | |
896 | timeleft = 0; | |
897 | rtn = NEEDS_RETRY; | |
898 | } else { | |
899 | timeleft = wait_for_completion_timeout(&done, timeout); | |
900 | } | |
1da177e4 | 901 | |
f59114b7 | 902 | shost->eh_action = NULL; |
1da177e4 | 903 | |
fc73648a | 904 | scsi_log_completion(scmd, rtn); |
1da177e4 | 905 | |
7dfdc9a5 CH |
906 | SCSI_LOG_ERROR_RECOVERY(3, |
907 | printk("%s: scmd: %p, timeleft: %ld\n", | |
cadbd4a5 | 908 | __func__, scmd, timeleft)); |
1da177e4 LT |
909 | |
910 | /* | |
fc73648a HR |
911 | * If there is time left scsi_eh_done got called, and we will examine |
912 | * the actual status codes to see whether the command actually did | |
913 | * complete normally, else if we have a zero return and no time left, | |
914 | * the command must still be pending, so abort it and return FAILED. | |
915 | * If we never actually managed to issue the command, because | |
916 | * ->queuecommand() kept returning non zero, use the rtn = FAILED | |
917 | * value above (so don't execute either branch of the if) | |
1da177e4 | 918 | */ |
7dfdc9a5 | 919 | if (timeleft) { |
1da177e4 LT |
920 | rtn = scsi_eh_completed_normally(scmd); |
921 | SCSI_LOG_ERROR_RECOVERY(3, | |
922 | printk("%s: scsi_eh_completed_normally %x\n", | |
cadbd4a5 | 923 | __func__, rtn)); |
7dfdc9a5 | 924 | |
1da177e4 LT |
925 | switch (rtn) { |
926 | case SUCCESS: | |
927 | case NEEDS_RETRY: | |
928 | case FAILED: | |
929 | break; | |
6e883b0e HR |
930 | case ADD_TO_MLQUEUE: |
931 | rtn = NEEDS_RETRY; | |
932 | break; | |
1da177e4 LT |
933 | default: |
934 | rtn = FAILED; | |
935 | break; | |
936 | } | |
fc73648a | 937 | } else if (!rtn) { |
292148f8 | 938 | scsi_abort_eh_cmnd(scmd); |
7dfdc9a5 | 939 | rtn = FAILED; |
1da177e4 LT |
940 | } |
941 | ||
e1c23468 | 942 | scsi_eh_restore_cmnd(scmd, &ses); |
18a4d0a2 | 943 | |
329a402c LZ |
944 | if (scmd->request->cmd_type != REQ_TYPE_BLOCK_PC) { |
945 | struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd); | |
946 | if (sdrv->eh_action) | |
947 | rtn = sdrv->eh_action(scmd, cmnd, cmnd_size, rtn); | |
948 | } | |
18a4d0a2 | 949 | |
1da177e4 LT |
950 | return rtn; |
951 | } | |
952 | ||
953 | /** | |
954 | * scsi_request_sense - Request sense data from a particular target. | |
955 | * @scmd: SCSI cmd for request sense. | |
956 | * | |
957 | * Notes: | |
958 | * Some hosts automatically obtain this information, others require | |
959 | * that we obtain it on our own. This function will *not* return until | |
960 | * the command either times out, or it completes. | |
dc8875e1 | 961 | */ |
1da177e4 LT |
962 | static int scsi_request_sense(struct scsi_cmnd *scmd) |
963 | { | |
0816c925 | 964 | return scsi_send_eh_cmnd(scmd, NULL, 0, scmd->device->eh_timeout, ~0); |
1da177e4 LT |
965 | } |
966 | ||
967 | /** | |
968 | * scsi_eh_finish_cmd - Handle a cmd that eh is finished with. | |
969 | * @scmd: Original SCSI cmd that eh has finished. | |
970 | * @done_q: Queue for processed commands. | |
971 | * | |
972 | * Notes: | |
973 | * We don't want to use the normal command completion while we are are | |
974 | * still handling errors - it may cause other commands to be queued, | |
eb44820c | 975 | * and that would disturb what we are doing. Thus we really want to |
1da177e4 LT |
976 | * keep a list of pending commands for final completion, and once we |
977 | * are ready to leave error handling we handle completion for real. | |
dc8875e1 | 978 | */ |
041c5fc3 | 979 | void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q) |
1da177e4 LT |
980 | { |
981 | scmd->device->host->host_failed--; | |
3111b0d1 | 982 | scmd->eh_eflags = 0; |
1da177e4 LT |
983 | list_move_tail(&scmd->eh_entry, done_q); |
984 | } | |
041c5fc3 | 985 | EXPORT_SYMBOL(scsi_eh_finish_cmd); |
1da177e4 LT |
986 | |
987 | /** | |
988 | * scsi_eh_get_sense - Get device sense data. | |
989 | * @work_q: Queue of commands to process. | |
eb44820c | 990 | * @done_q: Queue of processed commands. |
1da177e4 LT |
991 | * |
992 | * Description: | |
993 | * See if we need to request sense information. if so, then get it | |
0bf8c869 | 994 | * now, so we have a better idea of what to do. |
1da177e4 LT |
995 | * |
996 | * Notes: | |
997 | * This has the unfortunate side effect that if a shost adapter does | |
eb44820c | 998 | * not automatically request sense information, we end up shutting |
1da177e4 LT |
999 | * it down before we request it. |
1000 | * | |
1001 | * All drivers should request sense information internally these days, | |
1002 | * so for now all I have to say is tough noogies if you end up in here. | |
1003 | * | |
1004 | * XXX: Long term this code should go away, but that needs an audit of | |
1005 | * all LLDDs first. | |
dc8875e1 | 1006 | */ |
dca84e46 DW |
1007 | int scsi_eh_get_sense(struct list_head *work_q, |
1008 | struct list_head *done_q) | |
1da177e4 | 1009 | { |
937abeaa | 1010 | struct scsi_cmnd *scmd, *next; |
b4562022 | 1011 | struct Scsi_Host *shost; |
1da177e4 | 1012 | int rtn; |
b4562022 | 1013 | unsigned long flags; |
1da177e4 | 1014 | |
937abeaa | 1015 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 1016 | if ((scmd->eh_eflags & SCSI_EH_CANCEL_CMD) || |
1da177e4 LT |
1017 | SCSI_SENSE_VALID(scmd)) |
1018 | continue; | |
1019 | ||
b4562022 HR |
1020 | shost = scmd->device->host; |
1021 | spin_lock_irqsave(shost->host_lock, flags); | |
1022 | if (scsi_host_eh_past_deadline(shost)) { | |
1023 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1024 | SCSI_LOG_ERROR_RECOVERY(3, | |
1025 | shost_printk(KERN_INFO, shost, | |
1026 | "skip %s, past eh deadline\n", | |
1027 | __func__)); | |
1028 | break; | |
1029 | } | |
1030 | spin_unlock_irqrestore(shost->host_lock, flags); | |
3bf743e7 JG |
1031 | SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd, |
1032 | "%s: requesting sense\n", | |
1033 | current->comm)); | |
1da177e4 LT |
1034 | rtn = scsi_request_sense(scmd); |
1035 | if (rtn != SUCCESS) | |
1036 | continue; | |
1037 | ||
1038 | SCSI_LOG_ERROR_RECOVERY(3, printk("sense requested for %p" | |
1039 | " result %x\n", scmd, | |
1040 | scmd->result)); | |
1041 | SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense("bh", scmd)); | |
1042 | ||
1043 | rtn = scsi_decide_disposition(scmd); | |
1044 | ||
1045 | /* | |
1046 | * if the result was normal, then just pass it along to the | |
1047 | * upper level. | |
1048 | */ | |
1049 | if (rtn == SUCCESS) | |
1050 | /* we don't want this command reissued, just | |
1051 | * finished with the sense data, so set | |
1052 | * retries to the max allowed to ensure it | |
1053 | * won't get reissued */ | |
1054 | scmd->retries = scmd->allowed; | |
1055 | else if (rtn != NEEDS_RETRY) | |
1056 | continue; | |
1057 | ||
1058 | scsi_eh_finish_cmd(scmd, done_q); | |
1059 | } | |
1060 | ||
1061 | return list_empty(work_q); | |
1062 | } | |
dca84e46 | 1063 | EXPORT_SYMBOL_GPL(scsi_eh_get_sense); |
1da177e4 | 1064 | |
1da177e4 LT |
1065 | /** |
1066 | * scsi_eh_tur - Send TUR to device. | |
eb44820c | 1067 | * @scmd: &scsi_cmnd to send TUR |
1da177e4 LT |
1068 | * |
1069 | * Return value: | |
1070 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1071 | */ |
1da177e4 LT |
1072 | static int scsi_eh_tur(struct scsi_cmnd *scmd) |
1073 | { | |
1074 | static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0}; | |
1075 | int retry_cnt = 1, rtn; | |
1076 | ||
1077 | retry_tur: | |
0816c925 MP |
1078 | rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, |
1079 | scmd->device->eh_timeout, 0); | |
1da177e4 | 1080 | |
1da177e4 | 1081 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd %p rtn %x\n", |
cadbd4a5 | 1082 | __func__, scmd, rtn)); |
631c228c CH |
1083 | |
1084 | switch (rtn) { | |
1085 | case NEEDS_RETRY: | |
1da177e4 LT |
1086 | if (retry_cnt--) |
1087 | goto retry_tur; | |
631c228c CH |
1088 | /*FALLTHRU*/ |
1089 | case SUCCESS: | |
e47373ec | 1090 | return 0; |
631c228c CH |
1091 | default: |
1092 | return 1; | |
e47373ec | 1093 | } |
1da177e4 LT |
1094 | } |
1095 | ||
3eef6257 DJ |
1096 | /** |
1097 | * scsi_eh_test_devices - check if devices are responding from error recovery. | |
1098 | * @cmd_list: scsi commands in error recovery. | |
1099 | * @work_q: queue for commands which still need more error recovery | |
1100 | * @done_q: queue for commands which are finished | |
1101 | * @try_stu: boolean on if a STU command should be tried in addition to TUR. | |
1102 | * | |
1103 | * Decription: | |
1104 | * Tests if devices are in a working state. Commands to devices now in | |
1105 | * a working state are sent to the done_q while commands to devices which | |
1106 | * are still failing to respond are returned to the work_q for more | |
1107 | * processing. | |
1108 | **/ | |
1109 | static int scsi_eh_test_devices(struct list_head *cmd_list, | |
1110 | struct list_head *work_q, | |
1111 | struct list_head *done_q, int try_stu) | |
1112 | { | |
1113 | struct scsi_cmnd *scmd, *next; | |
1114 | struct scsi_device *sdev; | |
1115 | int finish_cmds; | |
b4562022 | 1116 | unsigned long flags; |
3eef6257 DJ |
1117 | |
1118 | while (!list_empty(cmd_list)) { | |
1119 | scmd = list_entry(cmd_list->next, struct scsi_cmnd, eh_entry); | |
1120 | sdev = scmd->device; | |
1121 | ||
b4562022 HR |
1122 | if (!try_stu) { |
1123 | spin_lock_irqsave(sdev->host->host_lock, flags); | |
1124 | if (scsi_host_eh_past_deadline(sdev->host)) { | |
1125 | /* Push items back onto work_q */ | |
1126 | list_splice_init(cmd_list, work_q); | |
1127 | spin_unlock_irqrestore(sdev->host->host_lock, | |
1128 | flags); | |
1129 | SCSI_LOG_ERROR_RECOVERY(3, | |
1130 | shost_printk(KERN_INFO, sdev->host, | |
1131 | "skip %s, past eh deadline", | |
1132 | __func__)); | |
1133 | break; | |
1134 | } | |
1135 | spin_unlock_irqrestore(sdev->host->host_lock, flags); | |
1136 | } | |
1137 | ||
3eef6257 DJ |
1138 | finish_cmds = !scsi_device_online(scmd->device) || |
1139 | (try_stu && !scsi_eh_try_stu(scmd) && | |
1140 | !scsi_eh_tur(scmd)) || | |
1141 | !scsi_eh_tur(scmd); | |
1142 | ||
1143 | list_for_each_entry_safe(scmd, next, cmd_list, eh_entry) | |
1144 | if (scmd->device == sdev) { | |
1145 | if (finish_cmds) | |
1146 | scsi_eh_finish_cmd(scmd, done_q); | |
1147 | else | |
1148 | list_move_tail(&scmd->eh_entry, work_q); | |
1149 | } | |
1150 | } | |
1151 | return list_empty(work_q); | |
1152 | } | |
1153 | ||
1154 | ||
1da177e4 | 1155 | /** |
eb44820c RL |
1156 | * scsi_eh_abort_cmds - abort pending commands. |
1157 | * @work_q: &list_head for pending commands. | |
1158 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1159 | * |
1160 | * Decription: | |
1161 | * Try and see whether or not it makes sense to try and abort the | |
eb44820c RL |
1162 | * running command. This only works out to be the case if we have one |
1163 | * command that has timed out. If the command simply failed, it makes | |
1da177e4 LT |
1164 | * no sense to try and abort the command, since as far as the shost |
1165 | * adapter is concerned, it isn't running. | |
dc8875e1 | 1166 | */ |
1da177e4 LT |
1167 | static int scsi_eh_abort_cmds(struct list_head *work_q, |
1168 | struct list_head *done_q) | |
1169 | { | |
937abeaa | 1170 | struct scsi_cmnd *scmd, *next; |
3eef6257 | 1171 | LIST_HEAD(check_list); |
1da177e4 | 1172 | int rtn; |
b4562022 HR |
1173 | struct Scsi_Host *shost; |
1174 | unsigned long flags; | |
1da177e4 | 1175 | |
937abeaa | 1176 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 1177 | if (!(scmd->eh_eflags & SCSI_EH_CANCEL_CMD)) |
1da177e4 | 1178 | continue; |
b4562022 HR |
1179 | shost = scmd->device->host; |
1180 | spin_lock_irqsave(shost->host_lock, flags); | |
1181 | if (scsi_host_eh_past_deadline(shost)) { | |
1182 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1183 | list_splice_init(&check_list, work_q); | |
1184 | SCSI_LOG_ERROR_RECOVERY(3, | |
1185 | shost_printk(KERN_INFO, shost, | |
1186 | "skip %s, past eh deadline\n", | |
1187 | __func__)); | |
1188 | return list_empty(work_q); | |
1189 | } | |
1190 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
1191 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting cmd:" |
1192 | "0x%p\n", current->comm, | |
1193 | scmd)); | |
b4562022 | 1194 | rtn = scsi_try_to_abort_cmd(shost->hostt, scmd); |
2f2eb587 | 1195 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
3111b0d1 | 1196 | scmd->eh_eflags &= ~SCSI_EH_CANCEL_CMD; |
3eef6257 | 1197 | if (rtn == FAST_IO_FAIL) |
1da177e4 | 1198 | scsi_eh_finish_cmd(scmd, done_q); |
3eef6257 DJ |
1199 | else |
1200 | list_move_tail(&scmd->eh_entry, &check_list); | |
1da177e4 LT |
1201 | } else |
1202 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting" | |
1203 | " cmd failed:" | |
1204 | "0x%p\n", | |
1205 | current->comm, | |
1206 | scmd)); | |
1207 | } | |
1208 | ||
3eef6257 | 1209 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4 LT |
1210 | } |
1211 | ||
1da177e4 LT |
1212 | /** |
1213 | * scsi_eh_try_stu - Send START_UNIT to device. | |
eb44820c | 1214 | * @scmd: &scsi_cmnd to send START_UNIT |
1da177e4 LT |
1215 | * |
1216 | * Return value: | |
1217 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1218 | */ |
1da177e4 LT |
1219 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd) |
1220 | { | |
1221 | static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0}; | |
1da177e4 | 1222 | |
631c228c | 1223 | if (scmd->device->allow_restart) { |
ed773e66 BK |
1224 | int i, rtn = NEEDS_RETRY; |
1225 | ||
1226 | for (i = 0; rtn == NEEDS_RETRY && i < 2; i++) | |
9728c081 | 1227 | rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0); |
1da177e4 | 1228 | |
631c228c CH |
1229 | if (rtn == SUCCESS) |
1230 | return 0; | |
1231 | } | |
1da177e4 | 1232 | |
1da177e4 LT |
1233 | return 1; |
1234 | } | |
1235 | ||
1236 | /** | |
1237 | * scsi_eh_stu - send START_UNIT if needed | |
eb44820c RL |
1238 | * @shost: &scsi host being recovered. |
1239 | * @work_q: &list_head for pending commands. | |
1240 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1241 | * |
1242 | * Notes: | |
1243 | * If commands are failing due to not ready, initializing command required, | |
0bf8c869 | 1244 | * try revalidating the device, which will end up sending a start unit. |
dc8875e1 | 1245 | */ |
1da177e4 LT |
1246 | static int scsi_eh_stu(struct Scsi_Host *shost, |
1247 | struct list_head *work_q, | |
1248 | struct list_head *done_q) | |
1249 | { | |
937abeaa | 1250 | struct scsi_cmnd *scmd, *stu_scmd, *next; |
1da177e4 | 1251 | struct scsi_device *sdev; |
b4562022 | 1252 | unsigned long flags; |
1da177e4 LT |
1253 | |
1254 | shost_for_each_device(sdev, shost) { | |
b4562022 HR |
1255 | spin_lock_irqsave(shost->host_lock, flags); |
1256 | if (scsi_host_eh_past_deadline(shost)) { | |
1257 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1258 | SCSI_LOG_ERROR_RECOVERY(3, | |
1259 | shost_printk(KERN_INFO, shost, | |
1260 | "skip %s, past eh deadline\n", | |
1261 | __func__)); | |
1262 | break; | |
1263 | } | |
1264 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
1265 | stu_scmd = NULL; |
1266 | list_for_each_entry(scmd, work_q, eh_entry) | |
1267 | if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) && | |
1268 | scsi_check_sense(scmd) == FAILED ) { | |
1269 | stu_scmd = scmd; | |
1270 | break; | |
1271 | } | |
1272 | ||
1273 | if (!stu_scmd) | |
1274 | continue; | |
1275 | ||
1276 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending START_UNIT to sdev:" | |
1277 | " 0x%p\n", current->comm, sdev)); | |
1278 | ||
1279 | if (!scsi_eh_try_stu(stu_scmd)) { | |
1280 | if (!scsi_device_online(sdev) || | |
1281 | !scsi_eh_tur(stu_scmd)) { | |
937abeaa CH |
1282 | list_for_each_entry_safe(scmd, next, |
1283 | work_q, eh_entry) { | |
1da177e4 LT |
1284 | if (scmd->device == sdev) |
1285 | scsi_eh_finish_cmd(scmd, done_q); | |
1286 | } | |
1287 | } | |
1288 | } else { | |
1289 | SCSI_LOG_ERROR_RECOVERY(3, | |
1290 | printk("%s: START_UNIT failed to sdev:" | |
1291 | " 0x%p\n", current->comm, sdev)); | |
1292 | } | |
1293 | } | |
1294 | ||
1295 | return list_empty(work_q); | |
1296 | } | |
1297 | ||
1298 | ||
1299 | /** | |
1300 | * scsi_eh_bus_device_reset - send bdr if needed | |
1301 | * @shost: scsi host being recovered. | |
eb44820c RL |
1302 | * @work_q: &list_head for pending commands. |
1303 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1304 | * |
1305 | * Notes: | |
eb44820c | 1306 | * Try a bus device reset. Still, look to see whether we have multiple |
1da177e4 LT |
1307 | * devices that are jammed or not - if we have multiple devices, it |
1308 | * makes no sense to try bus_device_reset - we really would need to try | |
0bf8c869 | 1309 | * a bus_reset instead. |
dc8875e1 | 1310 | */ |
1da177e4 LT |
1311 | static int scsi_eh_bus_device_reset(struct Scsi_Host *shost, |
1312 | struct list_head *work_q, | |
1313 | struct list_head *done_q) | |
1314 | { | |
937abeaa | 1315 | struct scsi_cmnd *scmd, *bdr_scmd, *next; |
1da177e4 | 1316 | struct scsi_device *sdev; |
b4562022 | 1317 | unsigned long flags; |
1da177e4 LT |
1318 | int rtn; |
1319 | ||
1320 | shost_for_each_device(sdev, shost) { | |
b4562022 HR |
1321 | spin_lock_irqsave(shost->host_lock, flags); |
1322 | if (scsi_host_eh_past_deadline(shost)) { | |
1323 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1324 | SCSI_LOG_ERROR_RECOVERY(3, | |
1325 | shost_printk(KERN_INFO, shost, | |
1326 | "skip %s, past eh deadline\n", | |
1327 | __func__)); | |
1328 | break; | |
1329 | } | |
1330 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
1331 | bdr_scmd = NULL; |
1332 | list_for_each_entry(scmd, work_q, eh_entry) | |
1333 | if (scmd->device == sdev) { | |
1334 | bdr_scmd = scmd; | |
1335 | break; | |
1336 | } | |
1337 | ||
1338 | if (!bdr_scmd) | |
1339 | continue; | |
1340 | ||
1341 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BDR sdev:" | |
1342 | " 0x%p\n", current->comm, | |
1343 | sdev)); | |
1344 | rtn = scsi_try_bus_device_reset(bdr_scmd); | |
2f2eb587 | 1345 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
1da177e4 | 1346 | if (!scsi_device_online(sdev) || |
2f2eb587 | 1347 | rtn == FAST_IO_FAIL || |
1da177e4 | 1348 | !scsi_eh_tur(bdr_scmd)) { |
937abeaa CH |
1349 | list_for_each_entry_safe(scmd, next, |
1350 | work_q, eh_entry) { | |
1da177e4 LT |
1351 | if (scmd->device == sdev) |
1352 | scsi_eh_finish_cmd(scmd, | |
1353 | done_q); | |
1354 | } | |
1355 | } | |
1356 | } else { | |
1357 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BDR" | |
1358 | " failed sdev:" | |
1359 | "0x%p\n", | |
1360 | current->comm, | |
1361 | sdev)); | |
1362 | } | |
1363 | } | |
1364 | ||
1365 | return list_empty(work_q); | |
1366 | } | |
1367 | ||
30bd7df8 MC |
1368 | /** |
1369 | * scsi_eh_target_reset - send target reset if needed | |
1370 | * @shost: scsi host being recovered. | |
1371 | * @work_q: &list_head for pending commands. | |
1372 | * @done_q: &list_head for processed commands. | |
1373 | * | |
1374 | * Notes: | |
1375 | * Try a target reset. | |
1376 | */ | |
1377 | static int scsi_eh_target_reset(struct Scsi_Host *shost, | |
1378 | struct list_head *work_q, | |
1379 | struct list_head *done_q) | |
1380 | { | |
98db5195 | 1381 | LIST_HEAD(tmp_list); |
3eef6257 | 1382 | LIST_HEAD(check_list); |
30bd7df8 | 1383 | |
98db5195 JB |
1384 | list_splice_init(work_q, &tmp_list); |
1385 | ||
1386 | while (!list_empty(&tmp_list)) { | |
1387 | struct scsi_cmnd *next, *scmd; | |
1388 | int rtn; | |
1389 | unsigned int id; | |
b4562022 HR |
1390 | unsigned long flags; |
1391 | ||
1392 | spin_lock_irqsave(shost->host_lock, flags); | |
1393 | if (scsi_host_eh_past_deadline(shost)) { | |
1394 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1395 | /* push back on work queue for further processing */ | |
1396 | list_splice_init(&check_list, work_q); | |
1397 | list_splice_init(&tmp_list, work_q); | |
1398 | SCSI_LOG_ERROR_RECOVERY(3, | |
1399 | shost_printk(KERN_INFO, shost, | |
1400 | "skip %s, past eh deadline\n", | |
1401 | __func__)); | |
1402 | return list_empty(work_q); | |
1403 | } | |
1404 | spin_unlock_irqrestore(shost->host_lock, flags); | |
98db5195 JB |
1405 | |
1406 | scmd = list_entry(tmp_list.next, struct scsi_cmnd, eh_entry); | |
1407 | id = scmd_id(scmd); | |
30bd7df8 MC |
1408 | |
1409 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending target reset " | |
1410 | "to target %d\n", | |
1411 | current->comm, id)); | |
98db5195 JB |
1412 | rtn = scsi_try_target_reset(scmd); |
1413 | if (rtn != SUCCESS && rtn != FAST_IO_FAIL) | |
30bd7df8 MC |
1414 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Target reset" |
1415 | " failed target: " | |
1416 | "%d\n", | |
1417 | current->comm, id)); | |
98db5195 JB |
1418 | list_for_each_entry_safe(scmd, next, &tmp_list, eh_entry) { |
1419 | if (scmd_id(scmd) != id) | |
1420 | continue; | |
1421 | ||
3eef6257 DJ |
1422 | if (rtn == SUCCESS) |
1423 | list_move_tail(&scmd->eh_entry, &check_list); | |
1424 | else if (rtn == FAST_IO_FAIL) | |
98db5195 JB |
1425 | scsi_eh_finish_cmd(scmd, done_q); |
1426 | else | |
1427 | /* push back on work queue for further processing */ | |
1428 | list_move(&scmd->eh_entry, work_q); | |
1429 | } | |
1430 | } | |
30bd7df8 | 1431 | |
3eef6257 | 1432 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
30bd7df8 MC |
1433 | } |
1434 | ||
1da177e4 | 1435 | /** |
0bf8c869 | 1436 | * scsi_eh_bus_reset - send a bus reset |
eb44820c RL |
1437 | * @shost: &scsi host being recovered. |
1438 | * @work_q: &list_head for pending commands. | |
1439 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1440 | */ |
1da177e4 LT |
1441 | static int scsi_eh_bus_reset(struct Scsi_Host *shost, |
1442 | struct list_head *work_q, | |
1443 | struct list_head *done_q) | |
1444 | { | |
937abeaa | 1445 | struct scsi_cmnd *scmd, *chan_scmd, *next; |
3eef6257 | 1446 | LIST_HEAD(check_list); |
1da177e4 LT |
1447 | unsigned int channel; |
1448 | int rtn; | |
b4562022 | 1449 | unsigned long flags; |
1da177e4 LT |
1450 | |
1451 | /* | |
1452 | * we really want to loop over the various channels, and do this on | |
1453 | * a channel by channel basis. we should also check to see if any | |
1454 | * of the failed commands are on soft_reset devices, and if so, skip | |
0bf8c869 | 1455 | * the reset. |
1da177e4 LT |
1456 | */ |
1457 | ||
1458 | for (channel = 0; channel <= shost->max_channel; channel++) { | |
b4562022 HR |
1459 | spin_lock_irqsave(shost->host_lock, flags); |
1460 | if (scsi_host_eh_past_deadline(shost)) { | |
1461 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1462 | list_splice_init(&check_list, work_q); | |
1463 | SCSI_LOG_ERROR_RECOVERY(3, | |
1464 | shost_printk(KERN_INFO, shost, | |
1465 | "skip %s, past eh deadline\n", | |
1466 | __func__)); | |
1467 | return list_empty(work_q); | |
1468 | } | |
1469 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1470 | ||
1da177e4 LT |
1471 | chan_scmd = NULL; |
1472 | list_for_each_entry(scmd, work_q, eh_entry) { | |
422c0d61 | 1473 | if (channel == scmd_channel(scmd)) { |
1da177e4 LT |
1474 | chan_scmd = scmd; |
1475 | break; | |
1476 | /* | |
1477 | * FIXME add back in some support for | |
1478 | * soft_reset devices. | |
1479 | */ | |
1480 | } | |
1481 | } | |
1482 | ||
1483 | if (!chan_scmd) | |
1484 | continue; | |
1485 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BRST chan:" | |
1486 | " %d\n", current->comm, | |
1487 | channel)); | |
1488 | rtn = scsi_try_bus_reset(chan_scmd); | |
2f2eb587 | 1489 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
937abeaa | 1490 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3eef6257 DJ |
1491 | if (channel == scmd_channel(scmd)) { |
1492 | if (rtn == FAST_IO_FAIL) | |
1da177e4 LT |
1493 | scsi_eh_finish_cmd(scmd, |
1494 | done_q); | |
3eef6257 DJ |
1495 | else |
1496 | list_move_tail(&scmd->eh_entry, | |
1497 | &check_list); | |
1498 | } | |
1da177e4 LT |
1499 | } |
1500 | } else { | |
1501 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BRST" | |
1502 | " failed chan: %d\n", | |
1503 | current->comm, | |
1504 | channel)); | |
1505 | } | |
1506 | } | |
3eef6257 | 1507 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4 LT |
1508 | } |
1509 | ||
1510 | /** | |
0bf8c869 | 1511 | * scsi_eh_host_reset - send a host reset |
1da177e4 LT |
1512 | * @work_q: list_head for processed commands. |
1513 | * @done_q: list_head for processed commands. | |
dc8875e1 | 1514 | */ |
1da177e4 LT |
1515 | static int scsi_eh_host_reset(struct list_head *work_q, |
1516 | struct list_head *done_q) | |
1517 | { | |
937abeaa | 1518 | struct scsi_cmnd *scmd, *next; |
3eef6257 | 1519 | LIST_HEAD(check_list); |
1da177e4 | 1520 | int rtn; |
1da177e4 LT |
1521 | |
1522 | if (!list_empty(work_q)) { | |
1523 | scmd = list_entry(work_q->next, | |
1524 | struct scsi_cmnd, eh_entry); | |
1525 | ||
1526 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending HRST\n" | |
1527 | , current->comm)); | |
1528 | ||
1529 | rtn = scsi_try_host_reset(scmd); | |
3eef6257 DJ |
1530 | if (rtn == SUCCESS) { |
1531 | list_splice_init(work_q, &check_list); | |
1532 | } else if (rtn == FAST_IO_FAIL) { | |
937abeaa | 1533 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1da177e4 LT |
1534 | scsi_eh_finish_cmd(scmd, done_q); |
1535 | } | |
1536 | } else { | |
1537 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: HRST" | |
1538 | " failed\n", | |
1539 | current->comm)); | |
1540 | } | |
1541 | } | |
3eef6257 | 1542 | return scsi_eh_test_devices(&check_list, work_q, done_q, 1); |
1da177e4 LT |
1543 | } |
1544 | ||
1545 | /** | |
1546 | * scsi_eh_offline_sdevs - offline scsi devices that fail to recover | |
1547 | * @work_q: list_head for processed commands. | |
1548 | * @done_q: list_head for processed commands. | |
dc8875e1 | 1549 | */ |
1da177e4 LT |
1550 | static void scsi_eh_offline_sdevs(struct list_head *work_q, |
1551 | struct list_head *done_q) | |
1552 | { | |
937abeaa | 1553 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1554 | |
937abeaa | 1555 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
31765d7d MW |
1556 | sdev_printk(KERN_INFO, scmd->device, "Device offlined - " |
1557 | "not ready after error recovery\n"); | |
1da177e4 | 1558 | scsi_device_set_state(scmd->device, SDEV_OFFLINE); |
3111b0d1 | 1559 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) { |
1da177e4 LT |
1560 | /* |
1561 | * FIXME: Handle lost cmds. | |
1562 | */ | |
1563 | } | |
1564 | scsi_eh_finish_cmd(scmd, done_q); | |
1565 | } | |
1566 | return; | |
1567 | } | |
1568 | ||
4a27446f MC |
1569 | /** |
1570 | * scsi_noretry_cmd - determinte if command should be failed fast | |
1571 | * @scmd: SCSI cmd to examine. | |
1572 | */ | |
1573 | int scsi_noretry_cmd(struct scsi_cmnd *scmd) | |
1574 | { | |
1575 | switch (host_byte(scmd->result)) { | |
1576 | case DID_OK: | |
1577 | break; | |
1578 | case DID_BUS_BUSY: | |
33659ebb | 1579 | return (scmd->request->cmd_flags & REQ_FAILFAST_TRANSPORT); |
4a27446f | 1580 | case DID_PARITY: |
33659ebb | 1581 | return (scmd->request->cmd_flags & REQ_FAILFAST_DEV); |
4a27446f MC |
1582 | case DID_ERROR: |
1583 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1584 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1585 | return 0; | |
1586 | /* fall through */ | |
1587 | case DID_SOFT_ERROR: | |
33659ebb | 1588 | return (scmd->request->cmd_flags & REQ_FAILFAST_DRIVER); |
4a27446f MC |
1589 | } |
1590 | ||
1591 | switch (status_byte(scmd->result)) { | |
1592 | case CHECK_CONDITION: | |
1593 | /* | |
1594 | * assume caller has checked sense and determinted | |
1595 | * the check condition was retryable. | |
1596 | */ | |
e96f6abe FT |
1597 | if (scmd->request->cmd_flags & REQ_FAILFAST_DEV || |
1598 | scmd->request->cmd_type == REQ_TYPE_BLOCK_PC) | |
1599 | return 1; | |
4a27446f MC |
1600 | } |
1601 | ||
1602 | return 0; | |
1603 | } | |
1604 | ||
1da177e4 LT |
1605 | /** |
1606 | * scsi_decide_disposition - Disposition a cmd on return from LLD. | |
1607 | * @scmd: SCSI cmd to examine. | |
1608 | * | |
1609 | * Notes: | |
1610 | * This is *only* called when we are examining the status after sending | |
1611 | * out the actual data command. any commands that are queued for error | |
1612 | * recovery (e.g. test_unit_ready) do *not* come through here. | |
1613 | * | |
1614 | * When this routine returns failed, it means the error handler thread | |
1615 | * is woken. In cases where the error code indicates an error that | |
1616 | * doesn't require the error handler read (i.e. we don't need to | |
1617 | * abort/reset), this function should return SUCCESS. | |
dc8875e1 | 1618 | */ |
1da177e4 LT |
1619 | int scsi_decide_disposition(struct scsi_cmnd *scmd) |
1620 | { | |
1621 | int rtn; | |
1622 | ||
1623 | /* | |
1624 | * if the device is offline, then we clearly just pass the result back | |
1625 | * up to the top level. | |
1626 | */ | |
1627 | if (!scsi_device_online(scmd->device)) { | |
1628 | SCSI_LOG_ERROR_RECOVERY(5, printk("%s: device offline - report" | |
1629 | " as SUCCESS\n", | |
cadbd4a5 | 1630 | __func__)); |
1da177e4 LT |
1631 | return SUCCESS; |
1632 | } | |
1633 | ||
1634 | /* | |
1635 | * first check the host byte, to see if there is anything in there | |
1636 | * that would indicate what we need to do. | |
1637 | */ | |
1638 | switch (host_byte(scmd->result)) { | |
1639 | case DID_PASSTHROUGH: | |
1640 | /* | |
1641 | * no matter what, pass this through to the upper layer. | |
1642 | * nuke this special code so that it looks like we are saying | |
1643 | * did_ok. | |
1644 | */ | |
1645 | scmd->result &= 0xff00ffff; | |
1646 | return SUCCESS; | |
1647 | case DID_OK: | |
1648 | /* | |
1649 | * looks good. drop through, and check the next byte. | |
1650 | */ | |
1651 | break; | |
1652 | case DID_NO_CONNECT: | |
1653 | case DID_BAD_TARGET: | |
1654 | case DID_ABORT: | |
1655 | /* | |
1656 | * note - this means that we just report the status back | |
1657 | * to the top level driver, not that we actually think | |
1658 | * that it indicates SUCCESS. | |
1659 | */ | |
1660 | return SUCCESS; | |
1661 | /* | |
1662 | * when the low level driver returns did_soft_error, | |
0bf8c869 | 1663 | * it is responsible for keeping an internal retry counter |
1da177e4 LT |
1664 | * in order to avoid endless loops (db) |
1665 | * | |
1666 | * actually this is a bug in this function here. we should | |
1667 | * be mindful of the maximum number of retries specified | |
1668 | * and not get stuck in a loop. | |
1669 | */ | |
1670 | case DID_SOFT_ERROR: | |
1671 | goto maybe_retry; | |
1672 | case DID_IMM_RETRY: | |
1673 | return NEEDS_RETRY; | |
1674 | ||
bf341919 | 1675 | case DID_REQUEUE: |
1676 | return ADD_TO_MLQUEUE; | |
a4dfaa6f MC |
1677 | case DID_TRANSPORT_DISRUPTED: |
1678 | /* | |
1679 | * LLD/transport was disrupted during processing of the IO. | |
1680 | * The transport class is now blocked/blocking, | |
1681 | * and the transport will decide what to do with the IO | |
939c2288 MC |
1682 | * based on its timers and recovery capablilities if |
1683 | * there are enough retries. | |
a4dfaa6f | 1684 | */ |
939c2288 | 1685 | goto maybe_retry; |
a4dfaa6f MC |
1686 | case DID_TRANSPORT_FAILFAST: |
1687 | /* | |
1688 | * The transport decided to failfast the IO (most likely | |
1689 | * the fast io fail tmo fired), so send IO directly upwards. | |
1690 | */ | |
1691 | return SUCCESS; | |
1da177e4 LT |
1692 | case DID_ERROR: |
1693 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1694 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1695 | /* | |
1696 | * execute reservation conflict processing code | |
1697 | * lower down | |
1698 | */ | |
1699 | break; | |
1700 | /* fallthrough */ | |
1da177e4 LT |
1701 | case DID_BUS_BUSY: |
1702 | case DID_PARITY: | |
1703 | goto maybe_retry; | |
1704 | case DID_TIME_OUT: | |
1705 | /* | |
1706 | * when we scan the bus, we get timeout messages for | |
1707 | * these commands if there is no device available. | |
1708 | * other hosts report did_no_connect for the same thing. | |
1709 | */ | |
1710 | if ((scmd->cmnd[0] == TEST_UNIT_READY || | |
1711 | scmd->cmnd[0] == INQUIRY)) { | |
1712 | return SUCCESS; | |
1713 | } else { | |
1714 | return FAILED; | |
1715 | } | |
1716 | case DID_RESET: | |
1717 | return SUCCESS; | |
1718 | default: | |
1719 | return FAILED; | |
1720 | } | |
1721 | ||
1722 | /* | |
1723 | * next, check the message byte. | |
1724 | */ | |
1725 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
1726 | return FAILED; | |
1727 | ||
1728 | /* | |
1729 | * check the status byte to see if this indicates anything special. | |
1730 | */ | |
1731 | switch (status_byte(scmd->result)) { | |
1732 | case QUEUE_FULL: | |
42a6a918 | 1733 | scsi_handle_queue_full(scmd->device); |
1da177e4 LT |
1734 | /* |
1735 | * the case of trying to send too many commands to a | |
1736 | * tagged queueing device. | |
1737 | */ | |
1738 | case BUSY: | |
1739 | /* | |
1740 | * device can't talk to us at the moment. Should only | |
1741 | * occur (SAM-3) when the task queue is empty, so will cause | |
1742 | * the empty queue handling to trigger a stall in the | |
1743 | * device. | |
1744 | */ | |
1745 | return ADD_TO_MLQUEUE; | |
1746 | case GOOD: | |
279afdfe EM |
1747 | if (scmd->cmnd[0] == REPORT_LUNS) |
1748 | scmd->device->sdev_target->expecting_lun_change = 0; | |
4a84067d | 1749 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 | 1750 | case COMMAND_TERMINATED: |
1da177e4 | 1751 | return SUCCESS; |
a9b589d9 VB |
1752 | case TASK_ABORTED: |
1753 | goto maybe_retry; | |
1da177e4 LT |
1754 | case CHECK_CONDITION: |
1755 | rtn = scsi_check_sense(scmd); | |
1756 | if (rtn == NEEDS_RETRY) | |
1757 | goto maybe_retry; | |
1758 | /* if rtn == FAILED, we have no sense information; | |
1759 | * returning FAILED will wake the error handler thread | |
1760 | * to collect the sense and redo the decide | |
1761 | * disposition */ | |
1762 | return rtn; | |
1763 | case CONDITION_GOOD: | |
1764 | case INTERMEDIATE_GOOD: | |
1765 | case INTERMEDIATE_C_GOOD: | |
1766 | case ACA_ACTIVE: | |
1767 | /* | |
1768 | * who knows? FIXME(eric) | |
1769 | */ | |
1770 | return SUCCESS; | |
1771 | ||
1772 | case RESERVATION_CONFLICT: | |
9ccfc756 JB |
1773 | sdev_printk(KERN_INFO, scmd->device, |
1774 | "reservation conflict\n"); | |
2082ebc4 | 1775 | set_host_byte(scmd, DID_NEXUS_FAILURE); |
1da177e4 LT |
1776 | return SUCCESS; /* causes immediate i/o error */ |
1777 | default: | |
1778 | return FAILED; | |
1779 | } | |
1780 | return FAILED; | |
1781 | ||
1782 | maybe_retry: | |
1783 | ||
1784 | /* we requeue for retry because the error was retryable, and | |
1785 | * the request was not marked fast fail. Note that above, | |
1786 | * even if the request is marked fast fail, we still requeue | |
1787 | * for queue congestion conditions (QUEUE_FULL or BUSY) */ | |
8884efab | 1788 | if ((++scmd->retries) <= scmd->allowed |
4a27446f | 1789 | && !scsi_noretry_cmd(scmd)) { |
1da177e4 LT |
1790 | return NEEDS_RETRY; |
1791 | } else { | |
1792 | /* | |
1793 | * no more retries - report this one back to upper level. | |
1794 | */ | |
1795 | return SUCCESS; | |
1796 | } | |
1797 | } | |
1798 | ||
f078727b FT |
1799 | static void eh_lock_door_done(struct request *req, int uptodate) |
1800 | { | |
1801 | __blk_put_request(req->q, req); | |
1802 | } | |
1803 | ||
1da177e4 LT |
1804 | /** |
1805 | * scsi_eh_lock_door - Prevent medium removal for the specified device | |
1806 | * @sdev: SCSI device to prevent medium removal | |
1807 | * | |
1808 | * Locking: | |
91bc31fb | 1809 | * We must be called from process context. |
1da177e4 LT |
1810 | * |
1811 | * Notes: | |
1812 | * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the | |
1813 | * head of the devices request queue, and continue. | |
dc8875e1 | 1814 | */ |
1da177e4 LT |
1815 | static void scsi_eh_lock_door(struct scsi_device *sdev) |
1816 | { | |
f078727b | 1817 | struct request *req; |
1da177e4 | 1818 | |
91bc31fb JB |
1819 | /* |
1820 | * blk_get_request with GFP_KERNEL (__GFP_WAIT) sleeps until a | |
1821 | * request becomes available | |
1822 | */ | |
f078727b | 1823 | req = blk_get_request(sdev->request_queue, READ, GFP_KERNEL); |
1da177e4 | 1824 | |
f078727b FT |
1825 | req->cmd[0] = ALLOW_MEDIUM_REMOVAL; |
1826 | req->cmd[1] = 0; | |
1827 | req->cmd[2] = 0; | |
1828 | req->cmd[3] = 0; | |
1829 | req->cmd[4] = SCSI_REMOVAL_PREVENT; | |
1830 | req->cmd[5] = 0; | |
1da177e4 | 1831 | |
f078727b FT |
1832 | req->cmd_len = COMMAND_SIZE(req->cmd[0]); |
1833 | ||
1834 | req->cmd_type = REQ_TYPE_BLOCK_PC; | |
1835 | req->cmd_flags |= REQ_QUIET; | |
1836 | req->timeout = 10 * HZ; | |
1837 | req->retries = 5; | |
1838 | ||
1839 | blk_execute_rq_nowait(req->q, NULL, req, 1, eh_lock_door_done); | |
1840 | } | |
1da177e4 LT |
1841 | |
1842 | /** | |
1843 | * scsi_restart_operations - restart io operations to the specified host. | |
1844 | * @shost: Host we are restarting. | |
1845 | * | |
1846 | * Notes: | |
1847 | * When we entered the error handler, we blocked all further i/o to | |
1848 | * this device. we need to 'reverse' this process. | |
dc8875e1 | 1849 | */ |
1da177e4 LT |
1850 | static void scsi_restart_operations(struct Scsi_Host *shost) |
1851 | { | |
1852 | struct scsi_device *sdev; | |
939647ee | 1853 | unsigned long flags; |
1da177e4 LT |
1854 | |
1855 | /* | |
1856 | * If the door was locked, we need to insert a door lock request | |
1857 | * onto the head of the SCSI request queue for the device. There | |
1858 | * is no point trying to lock the door of an off-line device. | |
1859 | */ | |
1860 | shost_for_each_device(sdev, shost) { | |
1861 | if (scsi_device_online(sdev) && sdev->locked) | |
1862 | scsi_eh_lock_door(sdev); | |
1863 | } | |
1864 | ||
1865 | /* | |
1866 | * next free up anything directly waiting upon the host. this | |
1867 | * will be requests for character device operations, and also for | |
1868 | * ioctls to queued block devices. | |
1869 | */ | |
b4562022 HR |
1870 | SCSI_LOG_ERROR_RECOVERY(3, |
1871 | printk("scsi_eh_%d waking up host to restart\n", | |
1872 | shost->host_no)); | |
1da177e4 | 1873 | |
939647ee JB |
1874 | spin_lock_irqsave(shost->host_lock, flags); |
1875 | if (scsi_host_set_state(shost, SHOST_RUNNING)) | |
1876 | if (scsi_host_set_state(shost, SHOST_CANCEL)) | |
1877 | BUG_ON(scsi_host_set_state(shost, SHOST_DEL)); | |
1878 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
1879 | |
1880 | wake_up(&shost->host_wait); | |
1881 | ||
1882 | /* | |
1883 | * finally we need to re-initiate requests that may be pending. we will | |
1884 | * have had everything blocked while error handling is taking place, and | |
1885 | * now that error recovery is done, we will need to ensure that these | |
1886 | * requests are started. | |
1887 | */ | |
1888 | scsi_run_host_queues(shost); | |
57fc2e33 DW |
1889 | |
1890 | /* | |
1891 | * if eh is active and host_eh_scheduled is pending we need to re-run | |
1892 | * recovery. we do this check after scsi_run_host_queues() to allow | |
1893 | * everything pent up since the last eh run a chance to make forward | |
1894 | * progress before we sync again. Either we'll immediately re-run | |
1895 | * recovery or scsi_device_unbusy() will wake us again when these | |
1896 | * pending commands complete. | |
1897 | */ | |
1898 | spin_lock_irqsave(shost->host_lock, flags); | |
1899 | if (shost->host_eh_scheduled) | |
1900 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) | |
1901 | WARN_ON(scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)); | |
1902 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
1903 | } |
1904 | ||
1905 | /** | |
1906 | * scsi_eh_ready_devs - check device ready state and recover if not. | |
1907 | * @shost: host to be recovered. | |
eb44820c RL |
1908 | * @work_q: &list_head for pending commands. |
1909 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1910 | */ |
dca84e46 DW |
1911 | void scsi_eh_ready_devs(struct Scsi_Host *shost, |
1912 | struct list_head *work_q, | |
1913 | struct list_head *done_q) | |
1da177e4 LT |
1914 | { |
1915 | if (!scsi_eh_stu(shost, work_q, done_q)) | |
1916 | if (!scsi_eh_bus_device_reset(shost, work_q, done_q)) | |
30bd7df8 MC |
1917 | if (!scsi_eh_target_reset(shost, work_q, done_q)) |
1918 | if (!scsi_eh_bus_reset(shost, work_q, done_q)) | |
1919 | if (!scsi_eh_host_reset(work_q, done_q)) | |
1920 | scsi_eh_offline_sdevs(work_q, | |
1921 | done_q); | |
1da177e4 | 1922 | } |
dca84e46 | 1923 | EXPORT_SYMBOL_GPL(scsi_eh_ready_devs); |
1da177e4 LT |
1924 | |
1925 | /** | |
1926 | * scsi_eh_flush_done_q - finish processed commands or retry them. | |
1927 | * @done_q: list_head of processed commands. | |
dc8875e1 | 1928 | */ |
041c5fc3 | 1929 | void scsi_eh_flush_done_q(struct list_head *done_q) |
1da177e4 | 1930 | { |
937abeaa | 1931 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1932 | |
937abeaa CH |
1933 | list_for_each_entry_safe(scmd, next, done_q, eh_entry) { |
1934 | list_del_init(&scmd->eh_entry); | |
1da177e4 | 1935 | if (scsi_device_online(scmd->device) && |
4a27446f | 1936 | !scsi_noretry_cmd(scmd) && |
8884efab | 1937 | (++scmd->retries <= scmd->allowed)) { |
1da177e4 LT |
1938 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush" |
1939 | " retry cmd: %p\n", | |
1940 | current->comm, | |
1941 | scmd)); | |
1942 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); | |
1943 | } else { | |
793698ce PM |
1944 | /* |
1945 | * If just we got sense for the device (called | |
1946 | * scsi_eh_get_sense), scmd->result is already | |
1947 | * set, do not set DRIVER_TIMEOUT. | |
1948 | */ | |
1da177e4 LT |
1949 | if (!scmd->result) |
1950 | scmd->result |= (DRIVER_TIMEOUT << 24); | |
1951 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush finish" | |
1952 | " cmd: %p\n", | |
1953 | current->comm, scmd)); | |
1954 | scsi_finish_command(scmd); | |
1955 | } | |
1956 | } | |
1957 | } | |
041c5fc3 | 1958 | EXPORT_SYMBOL(scsi_eh_flush_done_q); |
1da177e4 LT |
1959 | |
1960 | /** | |
1961 | * scsi_unjam_host - Attempt to fix a host which has a cmd that failed. | |
1962 | * @shost: Host to unjam. | |
1963 | * | |
1964 | * Notes: | |
1965 | * When we come in here, we *know* that all commands on the bus have | |
1966 | * either completed, failed or timed out. we also know that no further | |
1967 | * commands are being sent to the host, so things are relatively quiet | |
1968 | * and we have freedom to fiddle with things as we wish. | |
1969 | * | |
1970 | * This is only the *default* implementation. it is possible for | |
1971 | * individual drivers to supply their own version of this function, and | |
1972 | * if the maintainer wishes to do this, it is strongly suggested that | |
1973 | * this function be taken as a template and modified. this function | |
1974 | * was designed to correctly handle problems for about 95% of the | |
1975 | * different cases out there, and it should always provide at least a | |
1976 | * reasonable amount of error recovery. | |
1977 | * | |
1978 | * Any command marked 'failed' or 'timeout' must eventually have | |
1979 | * scsi_finish_cmd() called for it. we do all of the retry stuff | |
1980 | * here, so when we restart the host after we return it should have an | |
1981 | * empty queue. | |
dc8875e1 | 1982 | */ |
1da177e4 LT |
1983 | static void scsi_unjam_host(struct Scsi_Host *shost) |
1984 | { | |
1985 | unsigned long flags; | |
1986 | LIST_HEAD(eh_work_q); | |
1987 | LIST_HEAD(eh_done_q); | |
1988 | ||
1989 | spin_lock_irqsave(shost->host_lock, flags); | |
1990 | list_splice_init(&shost->eh_cmd_q, &eh_work_q); | |
1991 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1992 | ||
1993 | SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost, &eh_work_q)); | |
1994 | ||
1995 | if (!scsi_eh_get_sense(&eh_work_q, &eh_done_q)) | |
1996 | if (!scsi_eh_abort_cmds(&eh_work_q, &eh_done_q)) | |
1997 | scsi_eh_ready_devs(shost, &eh_work_q, &eh_done_q); | |
1998 | ||
b4562022 HR |
1999 | spin_lock_irqsave(shost->host_lock, flags); |
2000 | if (shost->eh_deadline) | |
2001 | shost->last_reset = 0; | |
2002 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
2003 | scsi_eh_flush_done_q(&eh_done_q); |
2004 | } | |
2005 | ||
2006 | /** | |
ad42eb1b | 2007 | * scsi_error_handler - SCSI error handler thread |
1da177e4 LT |
2008 | * @data: Host for which we are running. |
2009 | * | |
2010 | * Notes: | |
ad42eb1b CH |
2011 | * This is the main error handling loop. This is run as a kernel thread |
2012 | * for every SCSI host and handles all error handling activity. | |
dc8875e1 | 2013 | */ |
1da177e4 LT |
2014 | int scsi_error_handler(void *data) |
2015 | { | |
ad42eb1b | 2016 | struct Scsi_Host *shost = data; |
1da177e4 | 2017 | |
1da177e4 | 2018 | /* |
ad42eb1b CH |
2019 | * We use TASK_INTERRUPTIBLE so that the thread is not |
2020 | * counted against the load average as a running process. | |
2021 | * We never actually get interrupted because kthread_run | |
c03264a7 | 2022 | * disables signal delivery for the created thread. |
1da177e4 | 2023 | */ |
3ed7a470 | 2024 | while (!kthread_should_stop()) { |
b9d5c6b7 | 2025 | set_current_state(TASK_INTERRUPTIBLE); |
ee7863bc | 2026 | if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) || |
3ed7a470 | 2027 | shost->host_failed != shost->host_busy) { |
ad42eb1b | 2028 | SCSI_LOG_ERROR_RECOVERY(1, |
b4562022 | 2029 | printk("scsi_eh_%d: sleeping\n", |
ad42eb1b | 2030 | shost->host_no)); |
3ed7a470 | 2031 | schedule(); |
3ed7a470 JB |
2032 | continue; |
2033 | } | |
1da177e4 | 2034 | |
3ed7a470 | 2035 | __set_current_state(TASK_RUNNING); |
ad42eb1b | 2036 | SCSI_LOG_ERROR_RECOVERY(1, |
b4562022 HR |
2037 | printk("scsi_eh_%d: waking up %d/%d/%d\n", |
2038 | shost->host_no, shost->host_eh_scheduled, | |
2039 | shost->host_failed, shost->host_busy)); | |
1da177e4 | 2040 | |
1da177e4 LT |
2041 | /* |
2042 | * We have a host that is failing for some reason. Figure out | |
2043 | * what we need to do to get it up and online again (if we can). | |
2044 | * If we fail, we end up taking the thing offline. | |
2045 | */ | |
ae0751ff | 2046 | if (!shost->eh_noresume && scsi_autopm_get_host(shost) != 0) { |
bc4f2401 AS |
2047 | SCSI_LOG_ERROR_RECOVERY(1, |
2048 | printk(KERN_ERR "Error handler scsi_eh_%d " | |
2049 | "unable to autoresume\n", | |
2050 | shost->host_no)); | |
2051 | continue; | |
2052 | } | |
2053 | ||
9227c33d CH |
2054 | if (shost->transportt->eh_strategy_handler) |
2055 | shost->transportt->eh_strategy_handler(shost); | |
1da177e4 LT |
2056 | else |
2057 | scsi_unjam_host(shost); | |
2058 | ||
1da177e4 LT |
2059 | /* |
2060 | * Note - if the above fails completely, the action is to take | |
2061 | * individual devices offline and flush the queue of any | |
2062 | * outstanding requests that may have been pending. When we | |
2063 | * restart, we restart any I/O to any other devices on the bus | |
2064 | * which are still online. | |
2065 | */ | |
2066 | scsi_restart_operations(shost); | |
ae0751ff LM |
2067 | if (!shost->eh_noresume) |
2068 | scsi_autopm_put_host(shost); | |
1da177e4 | 2069 | } |
461a0ffb SR |
2070 | __set_current_state(TASK_RUNNING); |
2071 | ||
ad42eb1b CH |
2072 | SCSI_LOG_ERROR_RECOVERY(1, |
2073 | printk("Error handler scsi_eh_%d exiting\n", shost->host_no)); | |
3ed7a470 | 2074 | shost->ehandler = NULL; |
1da177e4 LT |
2075 | return 0; |
2076 | } | |
2077 | ||
2078 | /* | |
2079 | * Function: scsi_report_bus_reset() | |
2080 | * | |
2081 | * Purpose: Utility function used by low-level drivers to report that | |
2082 | * they have observed a bus reset on the bus being handled. | |
2083 | * | |
2084 | * Arguments: shost - Host in question | |
2085 | * channel - channel on which reset was observed. | |
2086 | * | |
2087 | * Returns: Nothing | |
2088 | * | |
2089 | * Lock status: Host lock must be held. | |
2090 | * | |
2091 | * Notes: This only needs to be called if the reset is one which | |
2092 | * originates from an unknown location. Resets originated | |
2093 | * by the mid-level itself don't need to call this, but there | |
2094 | * should be no harm. | |
2095 | * | |
2096 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
2097 | * is properly treated. | |
2098 | */ | |
2099 | void scsi_report_bus_reset(struct Scsi_Host *shost, int channel) | |
2100 | { | |
2101 | struct scsi_device *sdev; | |
2102 | ||
2103 | __shost_for_each_device(sdev, shost) { | |
30bd7df8 MC |
2104 | if (channel == sdev_channel(sdev)) |
2105 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
2106 | } |
2107 | } | |
2108 | EXPORT_SYMBOL(scsi_report_bus_reset); | |
2109 | ||
2110 | /* | |
2111 | * Function: scsi_report_device_reset() | |
2112 | * | |
2113 | * Purpose: Utility function used by low-level drivers to report that | |
2114 | * they have observed a device reset on the device being handled. | |
2115 | * | |
2116 | * Arguments: shost - Host in question | |
2117 | * channel - channel on which reset was observed | |
2118 | * target - target on which reset was observed | |
2119 | * | |
2120 | * Returns: Nothing | |
2121 | * | |
2122 | * Lock status: Host lock must be held | |
2123 | * | |
2124 | * Notes: This only needs to be called if the reset is one which | |
2125 | * originates from an unknown location. Resets originated | |
2126 | * by the mid-level itself don't need to call this, but there | |
2127 | * should be no harm. | |
2128 | * | |
2129 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
2130 | * is properly treated. | |
2131 | */ | |
2132 | void scsi_report_device_reset(struct Scsi_Host *shost, int channel, int target) | |
2133 | { | |
2134 | struct scsi_device *sdev; | |
2135 | ||
2136 | __shost_for_each_device(sdev, shost) { | |
422c0d61 | 2137 | if (channel == sdev_channel(sdev) && |
30bd7df8 MC |
2138 | target == sdev_id(sdev)) |
2139 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
2140 | } |
2141 | } | |
2142 | EXPORT_SYMBOL(scsi_report_device_reset); | |
2143 | ||
2144 | static void | |
2145 | scsi_reset_provider_done_command(struct scsi_cmnd *scmd) | |
2146 | { | |
2147 | } | |
2148 | ||
2149 | /* | |
2150 | * Function: scsi_reset_provider | |
2151 | * | |
2152 | * Purpose: Send requested reset to a bus or device at any phase. | |
2153 | * | |
2154 | * Arguments: device - device to send reset to | |
2155 | * flag - reset type (see scsi.h) | |
2156 | * | |
2157 | * Returns: SUCCESS/FAILURE. | |
2158 | * | |
2159 | * Notes: This is used by the SCSI Generic driver to provide | |
2160 | * Bus/Device reset capability. | |
2161 | */ | |
2162 | int | |
2163 | scsi_reset_provider(struct scsi_device *dev, int flag) | |
2164 | { | |
bc4f2401 | 2165 | struct scsi_cmnd *scmd; |
d7a1bb0a | 2166 | struct Scsi_Host *shost = dev->host; |
1da177e4 | 2167 | struct request req; |
d7a1bb0a | 2168 | unsigned long flags; |
1da177e4 LT |
2169 | int rtn; |
2170 | ||
bc4f2401 AS |
2171 | if (scsi_autopm_get_host(shost) < 0) |
2172 | return FAILED; | |
2173 | ||
2174 | scmd = scsi_get_command(dev, GFP_KERNEL); | |
4f54eec8 | 2175 | blk_rq_init(NULL, &req); |
1da177e4 | 2176 | scmd->request = &req; |
b4edcbca | 2177 | |
64a87b24 BH |
2178 | scmd->cmnd = req.cmd; |
2179 | ||
1da177e4 | 2180 | scmd->scsi_done = scsi_reset_provider_done_command; |
30b0c37b | 2181 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
1da177e4 LT |
2182 | |
2183 | scmd->cmd_len = 0; | |
2184 | ||
2185 | scmd->sc_data_direction = DMA_BIDIRECTIONAL; | |
1da177e4 | 2186 | |
d7a1bb0a JS |
2187 | spin_lock_irqsave(shost->host_lock, flags); |
2188 | shost->tmf_in_progress = 1; | |
2189 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2190 | ||
1da177e4 LT |
2191 | switch (flag) { |
2192 | case SCSI_TRY_RESET_DEVICE: | |
2193 | rtn = scsi_try_bus_device_reset(scmd); | |
2194 | if (rtn == SUCCESS) | |
2195 | break; | |
2196 | /* FALLTHROUGH */ | |
30bd7df8 MC |
2197 | case SCSI_TRY_RESET_TARGET: |
2198 | rtn = scsi_try_target_reset(scmd); | |
2199 | if (rtn == SUCCESS) | |
2200 | break; | |
2201 | /* FALLTHROUGH */ | |
1da177e4 LT |
2202 | case SCSI_TRY_RESET_BUS: |
2203 | rtn = scsi_try_bus_reset(scmd); | |
2204 | if (rtn == SUCCESS) | |
2205 | break; | |
2206 | /* FALLTHROUGH */ | |
2207 | case SCSI_TRY_RESET_HOST: | |
2208 | rtn = scsi_try_host_reset(scmd); | |
2209 | break; | |
2210 | default: | |
2211 | rtn = FAILED; | |
2212 | } | |
2213 | ||
d7a1bb0a JS |
2214 | spin_lock_irqsave(shost->host_lock, flags); |
2215 | shost->tmf_in_progress = 0; | |
2216 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2217 | ||
2218 | /* | |
2219 | * be sure to wake up anyone who was sleeping or had their queue | |
2220 | * suspended while we performed the TMF. | |
2221 | */ | |
2222 | SCSI_LOG_ERROR_RECOVERY(3, | |
2223 | printk("%s: waking up host to restart after TMF\n", | |
cadbd4a5 | 2224 | __func__)); |
d7a1bb0a JS |
2225 | |
2226 | wake_up(&shost->host_wait); | |
2227 | ||
2228 | scsi_run_host_queues(shost); | |
2229 | ||
1da177e4 | 2230 | scsi_next_command(scmd); |
bc4f2401 | 2231 | scsi_autopm_put_host(shost); |
1da177e4 LT |
2232 | return rtn; |
2233 | } | |
2234 | EXPORT_SYMBOL(scsi_reset_provider); | |
2235 | ||
2236 | /** | |
2237 | * scsi_normalize_sense - normalize main elements from either fixed or | |
2238 | * descriptor sense data format into a common format. | |
2239 | * | |
2240 | * @sense_buffer: byte array containing sense data returned by device | |
2241 | * @sb_len: number of valid bytes in sense_buffer | |
2242 | * @sshdr: pointer to instance of structure that common | |
2243 | * elements are written to. | |
2244 | * | |
2245 | * Notes: | |
2246 | * The "main elements" from sense data are: response_code, sense_key, | |
2247 | * asc, ascq and additional_length (only for descriptor format). | |
2248 | * | |
2249 | * Typically this function can be called after a device has | |
2250 | * responded to a SCSI command with the CHECK_CONDITION status. | |
2251 | * | |
2252 | * Return value: | |
2253 | * 1 if valid sense data information found, else 0; | |
dc8875e1 | 2254 | */ |
1da177e4 LT |
2255 | int scsi_normalize_sense(const u8 *sense_buffer, int sb_len, |
2256 | struct scsi_sense_hdr *sshdr) | |
2257 | { | |
33aa687d | 2258 | if (!sense_buffer || !sb_len) |
1da177e4 LT |
2259 | return 0; |
2260 | ||
2261 | memset(sshdr, 0, sizeof(struct scsi_sense_hdr)); | |
2262 | ||
2263 | sshdr->response_code = (sense_buffer[0] & 0x7f); | |
33aa687d JB |
2264 | |
2265 | if (!scsi_sense_valid(sshdr)) | |
2266 | return 0; | |
2267 | ||
1da177e4 LT |
2268 | if (sshdr->response_code >= 0x72) { |
2269 | /* | |
2270 | * descriptor format | |
2271 | */ | |
2272 | if (sb_len > 1) | |
2273 | sshdr->sense_key = (sense_buffer[1] & 0xf); | |
2274 | if (sb_len > 2) | |
2275 | sshdr->asc = sense_buffer[2]; | |
2276 | if (sb_len > 3) | |
2277 | sshdr->ascq = sense_buffer[3]; | |
2278 | if (sb_len > 7) | |
2279 | sshdr->additional_length = sense_buffer[7]; | |
2280 | } else { | |
0bf8c869 | 2281 | /* |
1da177e4 LT |
2282 | * fixed format |
2283 | */ | |
2284 | if (sb_len > 2) | |
2285 | sshdr->sense_key = (sense_buffer[2] & 0xf); | |
2286 | if (sb_len > 7) { | |
2287 | sb_len = (sb_len < (sense_buffer[7] + 8)) ? | |
2288 | sb_len : (sense_buffer[7] + 8); | |
2289 | if (sb_len > 12) | |
2290 | sshdr->asc = sense_buffer[12]; | |
2291 | if (sb_len > 13) | |
2292 | sshdr->ascq = sense_buffer[13]; | |
2293 | } | |
2294 | } | |
2295 | ||
2296 | return 1; | |
2297 | } | |
2298 | EXPORT_SYMBOL(scsi_normalize_sense); | |
2299 | ||
1da177e4 LT |
2300 | int scsi_command_normalize_sense(struct scsi_cmnd *cmd, |
2301 | struct scsi_sense_hdr *sshdr) | |
2302 | { | |
2303 | return scsi_normalize_sense(cmd->sense_buffer, | |
b80ca4f7 | 2304 | SCSI_SENSE_BUFFERSIZE, sshdr); |
1da177e4 LT |
2305 | } |
2306 | EXPORT_SYMBOL(scsi_command_normalize_sense); | |
2307 | ||
2308 | /** | |
eb44820c | 2309 | * scsi_sense_desc_find - search for a given descriptor type in descriptor sense data format. |
1da177e4 LT |
2310 | * @sense_buffer: byte array of descriptor format sense data |
2311 | * @sb_len: number of valid bytes in sense_buffer | |
2312 | * @desc_type: value of descriptor type to find | |
2313 | * (e.g. 0 -> information) | |
2314 | * | |
2315 | * Notes: | |
2316 | * only valid when sense data is in descriptor format | |
2317 | * | |
2318 | * Return value: | |
2319 | * pointer to start of (first) descriptor if found else NULL | |
dc8875e1 | 2320 | */ |
1da177e4 LT |
2321 | const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len, |
2322 | int desc_type) | |
2323 | { | |
2324 | int add_sen_len, add_len, desc_len, k; | |
2325 | const u8 * descp; | |
2326 | ||
2327 | if ((sb_len < 8) || (0 == (add_sen_len = sense_buffer[7]))) | |
2328 | return NULL; | |
2329 | if ((sense_buffer[0] < 0x72) || (sense_buffer[0] > 0x73)) | |
2330 | return NULL; | |
2331 | add_sen_len = (add_sen_len < (sb_len - 8)) ? | |
2332 | add_sen_len : (sb_len - 8); | |
2333 | descp = &sense_buffer[8]; | |
2334 | for (desc_len = 0, k = 0; k < add_sen_len; k += desc_len) { | |
2335 | descp += desc_len; | |
2336 | add_len = (k < (add_sen_len - 1)) ? descp[1]: -1; | |
2337 | desc_len = add_len + 2; | |
2338 | if (descp[0] == desc_type) | |
2339 | return descp; | |
2340 | if (add_len < 0) // short descriptor ?? | |
2341 | break; | |
2342 | } | |
2343 | return NULL; | |
2344 | } | |
2345 | EXPORT_SYMBOL(scsi_sense_desc_find); | |
2346 | ||
2347 | /** | |
eb44820c | 2348 | * scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor format) |
1da177e4 LT |
2349 | * @sense_buffer: byte array of sense data |
2350 | * @sb_len: number of valid bytes in sense_buffer | |
2351 | * @info_out: pointer to 64 integer where 8 or 4 byte information | |
2352 | * field will be placed if found. | |
2353 | * | |
2354 | * Return value: | |
2355 | * 1 if information field found, 0 if not found. | |
dc8875e1 | 2356 | */ |
1da177e4 LT |
2357 | int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len, |
2358 | u64 * info_out) | |
2359 | { | |
2360 | int j; | |
2361 | const u8 * ucp; | |
2362 | u64 ull; | |
2363 | ||
2364 | if (sb_len < 7) | |
2365 | return 0; | |
2366 | switch (sense_buffer[0] & 0x7f) { | |
2367 | case 0x70: | |
2368 | case 0x71: | |
2369 | if (sense_buffer[0] & 0x80) { | |
2370 | *info_out = (sense_buffer[3] << 24) + | |
2371 | (sense_buffer[4] << 16) + | |
2372 | (sense_buffer[5] << 8) + sense_buffer[6]; | |
2373 | return 1; | |
2374 | } else | |
2375 | return 0; | |
2376 | case 0x72: | |
2377 | case 0x73: | |
2378 | ucp = scsi_sense_desc_find(sense_buffer, sb_len, | |
2379 | 0 /* info desc */); | |
2380 | if (ucp && (0xa == ucp[1])) { | |
2381 | ull = 0; | |
2382 | for (j = 0; j < 8; ++j) { | |
2383 | if (j > 0) | |
2384 | ull <<= 8; | |
2385 | ull |= ucp[4 + j]; | |
2386 | } | |
2387 | *info_out = ull; | |
2388 | return 1; | |
2389 | } else | |
2390 | return 0; | |
2391 | default: | |
2392 | return 0; | |
2393 | } | |
2394 | } | |
2395 | EXPORT_SYMBOL(scsi_get_sense_info_fld); | |
3bc6a261 FT |
2396 | |
2397 | /** | |
2398 | * scsi_build_sense_buffer - build sense data in a buffer | |
2399 | * @desc: Sense format (non zero == descriptor format, | |
2400 | * 0 == fixed format) | |
2401 | * @buf: Where to build sense data | |
2402 | * @key: Sense key | |
2403 | * @asc: Additional sense code | |
2404 | * @ascq: Additional sense code qualifier | |
2405 | * | |
2406 | **/ | |
2407 | void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq) | |
2408 | { | |
2409 | if (desc) { | |
2410 | buf[0] = 0x72; /* descriptor, current */ | |
2411 | buf[1] = key; | |
2412 | buf[2] = asc; | |
2413 | buf[3] = ascq; | |
2414 | buf[7] = 0; | |
2415 | } else { | |
2416 | buf[0] = 0x70; /* fixed, current */ | |
2417 | buf[2] = key; | |
2418 | buf[7] = 0xa; | |
2419 | buf[12] = asc; | |
2420 | buf[13] = ascq; | |
2421 | } | |
2422 | } | |
2423 | EXPORT_SYMBOL(scsi_build_sense_buffer); |