Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * scsi_error.c Copyright (C) 1997 Eric Youngdale | |
3 | * | |
4 | * SCSI error/timeout handling | |
5 | * Initial versions: Eric Youngdale. Based upon conversations with | |
0bf8c869 | 6 | * Leonard Zubkoff and David Miller at Linux Expo, |
1da177e4 LT |
7 | * ideas originating from all over the place. |
8 | * | |
9 | * Restructured scsi_unjam_host and associated functions. | |
10 | * September 04, 2002 Mike Anderson (andmike@us.ibm.com) | |
11 | * | |
12 | * Forward port of Russell King's (rmk@arm.linux.org.uk) changes and | |
0bf8c869 | 13 | * minor cleanups. |
1da177e4 LT |
14 | * September 30, 2002 Mike Anderson (andmike@us.ibm.com) |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/sched.h> | |
5a0e3ad6 | 19 | #include <linux/gfp.h> |
1da177e4 LT |
20 | #include <linux/timer.h> |
21 | #include <linux/string.h> | |
1da177e4 | 22 | #include <linux/kernel.h> |
83144186 | 23 | #include <linux/freezer.h> |
c5478def | 24 | #include <linux/kthread.h> |
1da177e4 LT |
25 | #include <linux/interrupt.h> |
26 | #include <linux/blkdev.h> | |
27 | #include <linux/delay.h> | |
fc73648a | 28 | #include <linux/jiffies.h> |
1da177e4 LT |
29 | |
30 | #include <scsi/scsi.h> | |
beb40487 | 31 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
32 | #include <scsi/scsi_dbg.h> |
33 | #include <scsi/scsi_device.h> | |
18a4d0a2 | 34 | #include <scsi/scsi_driver.h> |
1da177e4 | 35 | #include <scsi/scsi_eh.h> |
c829c394 | 36 | #include <scsi/scsi_transport.h> |
1da177e4 LT |
37 | #include <scsi/scsi_host.h> |
38 | #include <scsi/scsi_ioctl.h> | |
1da177e4 LT |
39 | |
40 | #include "scsi_priv.h" | |
41 | #include "scsi_logging.h" | |
79ee8304 | 42 | #include "scsi_transport_api.h" |
1da177e4 | 43 | |
bf816235 KT |
44 | #include <trace/events/scsi.h> |
45 | ||
14216561 JB |
46 | static void scsi_eh_done(struct scsi_cmnd *scmd); |
47 | ||
1da177e4 LT |
48 | /* |
49 | * These should *probably* be handled by the host itself. | |
50 | * Since it is allowed to sleep, it probably should. | |
51 | */ | |
52 | #define BUS_RESET_SETTLE_TIME (10) | |
53 | #define HOST_RESET_SETTLE_TIME (10) | |
54 | ||
3eef6257 DJ |
55 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd); |
56 | ||
1da177e4 LT |
57 | /* called with shost->host_lock held */ |
58 | void scsi_eh_wakeup(struct Scsi_Host *shost) | |
59 | { | |
60 | if (shost->host_busy == shost->host_failed) { | |
bf816235 | 61 | trace_scsi_eh_wakeup(shost); |
3ed7a470 | 62 | wake_up_process(shost->ehandler); |
1da177e4 LT |
63 | SCSI_LOG_ERROR_RECOVERY(5, |
64 | printk("Waking error handler thread\n")); | |
65 | } | |
66 | } | |
f8bbfc24 TH |
67 | |
68 | /** | |
69 | * scsi_schedule_eh - schedule EH for SCSI host | |
70 | * @shost: SCSI host to invoke error handling on. | |
71 | * | |
72 | * Schedule SCSI EH without scmd. | |
dc8875e1 | 73 | */ |
f8bbfc24 TH |
74 | void scsi_schedule_eh(struct Scsi_Host *shost) |
75 | { | |
76 | unsigned long flags; | |
77 | ||
78 | spin_lock_irqsave(shost->host_lock, flags); | |
79 | ||
80 | if (scsi_host_set_state(shost, SHOST_RECOVERY) == 0 || | |
81 | scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY) == 0) { | |
82 | shost->host_eh_scheduled++; | |
83 | scsi_eh_wakeup(shost); | |
84 | } | |
85 | ||
86 | spin_unlock_irqrestore(shost->host_lock, flags); | |
87 | } | |
88 | EXPORT_SYMBOL_GPL(scsi_schedule_eh); | |
1da177e4 LT |
89 | |
90 | /** | |
91 | * scsi_eh_scmd_add - add scsi cmd to error handling. | |
92 | * @scmd: scmd to run eh on. | |
93 | * @eh_flag: optional SCSI_EH flag. | |
94 | * | |
95 | * Return value: | |
96 | * 0 on failure. | |
dc8875e1 | 97 | */ |
1da177e4 LT |
98 | int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag) |
99 | { | |
100 | struct Scsi_Host *shost = scmd->device->host; | |
101 | unsigned long flags; | |
939647ee | 102 | int ret = 0; |
1da177e4 | 103 | |
3ed7a470 | 104 | if (!shost->ehandler) |
1da177e4 LT |
105 | return 0; |
106 | ||
107 | spin_lock_irqsave(shost->host_lock, flags); | |
939647ee JB |
108 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) |
109 | if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) | |
110 | goto out_unlock; | |
1da177e4 | 111 | |
939647ee | 112 | ret = 1; |
3111b0d1 | 113 | scmd->eh_eflags |= eh_flag; |
1da177e4 | 114 | list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q); |
1da177e4 LT |
115 | shost->host_failed++; |
116 | scsi_eh_wakeup(shost); | |
939647ee | 117 | out_unlock: |
1da177e4 | 118 | spin_unlock_irqrestore(shost->host_lock, flags); |
939647ee | 119 | return ret; |
1da177e4 LT |
120 | } |
121 | ||
1da177e4 LT |
122 | /** |
123 | * scsi_times_out - Timeout function for normal scsi commands. | |
242f9dcb | 124 | * @req: request that is timing out. |
1da177e4 LT |
125 | * |
126 | * Notes: | |
127 | * We do not need to lock this. There is the potential for a race | |
128 | * only in that the normal completion handling might run, but if the | |
129 | * normal completion function determines that the timer has already | |
130 | * fired, then it mustn't do anything. | |
dc8875e1 | 131 | */ |
242f9dcb | 132 | enum blk_eh_timer_return scsi_times_out(struct request *req) |
1da177e4 | 133 | { |
242f9dcb | 134 | struct scsi_cmnd *scmd = req->special; |
242f9dcb | 135 | enum blk_eh_timer_return rtn = BLK_EH_NOT_HANDLED; |
0bf8c869 | 136 | struct Scsi_Host *host = scmd->device->host; |
6c5f8ce1 | 137 | |
bf816235 | 138 | trace_scsi_dispatch_cmd_timeout(scmd); |
1da177e4 LT |
139 | scsi_log_completion(scmd, TIMEOUT_ERROR); |
140 | ||
0bf8c869 JJ |
141 | if (host->transportt->eh_timed_out) |
142 | rtn = host->transportt->eh_timed_out(scmd); | |
143 | else if (host->hostt->eh_timed_out) | |
144 | rtn = host->hostt->eh_timed_out(scmd); | |
1da177e4 | 145 | |
18a4d0a2 MP |
146 | scmd->result |= DID_TIME_OUT << 16; |
147 | ||
fa990781 | 148 | if (unlikely(rtn == BLK_EH_NOT_HANDLED && |
18a4d0a2 | 149 | !scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD))) |
fa990781 | 150 | rtn = BLK_EH_HANDLED; |
242f9dcb | 151 | |
fa990781 | 152 | return rtn; |
1da177e4 LT |
153 | } |
154 | ||
155 | /** | |
156 | * scsi_block_when_processing_errors - Prevent cmds from being queued. | |
157 | * @sdev: Device on which we are performing recovery. | |
158 | * | |
159 | * Description: | |
160 | * We block until the host is out of error recovery, and then check to | |
161 | * see whether the host or the device is offline. | |
162 | * | |
163 | * Return value: | |
164 | * 0 when dev was taken offline by error recovery. 1 OK to proceed. | |
dc8875e1 | 165 | */ |
1da177e4 LT |
166 | int scsi_block_when_processing_errors(struct scsi_device *sdev) |
167 | { | |
168 | int online; | |
169 | ||
939647ee | 170 | wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host)); |
1da177e4 LT |
171 | |
172 | online = scsi_device_online(sdev); | |
173 | ||
cadbd4a5 | 174 | SCSI_LOG_ERROR_RECOVERY(5, printk("%s: rtn: %d\n", __func__, |
1da177e4 LT |
175 | online)); |
176 | ||
177 | return online; | |
178 | } | |
179 | EXPORT_SYMBOL(scsi_block_when_processing_errors); | |
180 | ||
181 | #ifdef CONFIG_SCSI_LOGGING | |
182 | /** | |
183 | * scsi_eh_prt_fail_stats - Log info on failures. | |
184 | * @shost: scsi host being recovered. | |
185 | * @work_q: Queue of scsi cmds to process. | |
dc8875e1 | 186 | */ |
1da177e4 LT |
187 | static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost, |
188 | struct list_head *work_q) | |
189 | { | |
190 | struct scsi_cmnd *scmd; | |
191 | struct scsi_device *sdev; | |
192 | int total_failures = 0; | |
193 | int cmd_failed = 0; | |
194 | int cmd_cancel = 0; | |
195 | int devices_failed = 0; | |
196 | ||
197 | shost_for_each_device(sdev, shost) { | |
198 | list_for_each_entry(scmd, work_q, eh_entry) { | |
199 | if (scmd->device == sdev) { | |
200 | ++total_failures; | |
3111b0d1 | 201 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) |
1da177e4 | 202 | ++cmd_cancel; |
0bf8c869 | 203 | else |
1da177e4 LT |
204 | ++cmd_failed; |
205 | } | |
206 | } | |
207 | ||
208 | if (cmd_cancel || cmd_failed) { | |
209 | SCSI_LOG_ERROR_RECOVERY(3, | |
9ccfc756 JB |
210 | sdev_printk(KERN_INFO, sdev, |
211 | "%s: cmds failed: %d, cancel: %d\n", | |
cadbd4a5 | 212 | __func__, cmd_failed, |
9ccfc756 | 213 | cmd_cancel)); |
1da177e4 LT |
214 | cmd_cancel = 0; |
215 | cmd_failed = 0; | |
216 | ++devices_failed; | |
217 | } | |
218 | } | |
219 | ||
220 | SCSI_LOG_ERROR_RECOVERY(2, printk("Total of %d commands on %d" | |
221 | " devices require eh work\n", | |
0bf8c869 | 222 | total_failures, devices_failed)); |
1da177e4 LT |
223 | } |
224 | #endif | |
225 | ||
279afdfe EM |
226 | /** |
227 | * scsi_report_lun_change - Set flag on all *other* devices on the same target | |
228 | * to indicate that a UNIT ATTENTION is expected. | |
229 | * @sdev: Device reporting the UNIT ATTENTION | |
230 | */ | |
231 | static void scsi_report_lun_change(struct scsi_device *sdev) | |
232 | { | |
233 | sdev->sdev_target->expecting_lun_change = 1; | |
234 | } | |
235 | ||
236 | /** | |
237 | * scsi_report_sense - Examine scsi sense information and log messages for | |
238 | * certain conditions, also issue uevents for some of them. | |
239 | * @sdev: Device reporting the sense code | |
240 | * @sshdr: sshdr to be examined | |
241 | */ | |
242 | static void scsi_report_sense(struct scsi_device *sdev, | |
243 | struct scsi_sense_hdr *sshdr) | |
244 | { | |
245 | enum scsi_device_event evt_type = SDEV_EVT_MAXBITS; /* i.e. none */ | |
246 | ||
247 | if (sshdr->sense_key == UNIT_ATTENTION) { | |
248 | if (sshdr->asc == 0x3f && sshdr->ascq == 0x03) { | |
249 | evt_type = SDEV_EVT_INQUIRY_CHANGE_REPORTED; | |
250 | sdev_printk(KERN_WARNING, sdev, | |
251 | "Inquiry data has changed"); | |
252 | } else if (sshdr->asc == 0x3f && sshdr->ascq == 0x0e) { | |
253 | evt_type = SDEV_EVT_LUN_CHANGE_REPORTED; | |
254 | scsi_report_lun_change(sdev); | |
255 | sdev_printk(KERN_WARNING, sdev, | |
256 | "Warning! Received an indication that the " | |
257 | "LUN assignments on this target have " | |
258 | "changed. The Linux SCSI layer does not " | |
259 | "automatically remap LUN assignments.\n"); | |
260 | } else if (sshdr->asc == 0x3f) | |
261 | sdev_printk(KERN_WARNING, sdev, | |
262 | "Warning! Received an indication that the " | |
263 | "operating parameters on this target have " | |
264 | "changed. The Linux SCSI layer does not " | |
265 | "automatically adjust these parameters.\n"); | |
266 | ||
267 | if (sshdr->asc == 0x38 && sshdr->ascq == 0x07) { | |
268 | evt_type = SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED; | |
269 | sdev_printk(KERN_WARNING, sdev, | |
270 | "Warning! Received an indication that the " | |
271 | "LUN reached a thin provisioning soft " | |
272 | "threshold.\n"); | |
273 | } | |
274 | ||
275 | if (sshdr->asc == 0x2a && sshdr->ascq == 0x01) { | |
276 | evt_type = SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED; | |
277 | sdev_printk(KERN_WARNING, sdev, | |
278 | "Mode parameters changed"); | |
279 | } else if (sshdr->asc == 0x2a && sshdr->ascq == 0x09) { | |
280 | evt_type = SDEV_EVT_CAPACITY_CHANGE_REPORTED; | |
281 | sdev_printk(KERN_WARNING, sdev, | |
282 | "Capacity data has changed"); | |
283 | } else if (sshdr->asc == 0x2a) | |
284 | sdev_printk(KERN_WARNING, sdev, | |
285 | "Parameters changed"); | |
286 | } | |
287 | ||
288 | if (evt_type != SDEV_EVT_MAXBITS) { | |
289 | set_bit(evt_type, sdev->pending_events); | |
290 | schedule_work(&sdev->event_work); | |
291 | } | |
292 | } | |
293 | ||
1da177e4 LT |
294 | /** |
295 | * scsi_check_sense - Examine scsi cmd sense | |
296 | * @scmd: Cmd to have sense checked. | |
297 | * | |
298 | * Return value: | |
87f14e65 | 299 | * SUCCESS or FAILED or NEEDS_RETRY or ADD_TO_MLQUEUE |
1da177e4 LT |
300 | * |
301 | * Notes: | |
302 | * When a deferred error is detected the current command has | |
303 | * not been executed and needs retrying. | |
dc8875e1 | 304 | */ |
1da177e4 LT |
305 | static int scsi_check_sense(struct scsi_cmnd *scmd) |
306 | { | |
a6a8d9f8 | 307 | struct scsi_device *sdev = scmd->device; |
1da177e4 LT |
308 | struct scsi_sense_hdr sshdr; |
309 | ||
310 | if (! scsi_command_normalize_sense(scmd, &sshdr)) | |
311 | return FAILED; /* no valid sense data */ | |
312 | ||
14216561 JB |
313 | if (scmd->cmnd[0] == TEST_UNIT_READY && scmd->scsi_done != scsi_eh_done) |
314 | /* | |
315 | * nasty: for mid-layer issued TURs, we need to return the | |
316 | * actual sense data without any recovery attempt. For eh | |
317 | * issued ones, we need to try to recover and interpret | |
318 | */ | |
319 | return SUCCESS; | |
320 | ||
279afdfe EM |
321 | scsi_report_sense(sdev, &sshdr); |
322 | ||
1da177e4 LT |
323 | if (scsi_sense_is_deferred(&sshdr)) |
324 | return NEEDS_RETRY; | |
325 | ||
a6a8d9f8 CS |
326 | if (sdev->scsi_dh_data && sdev->scsi_dh_data->scsi_dh && |
327 | sdev->scsi_dh_data->scsi_dh->check_sense) { | |
328 | int rc; | |
329 | ||
330 | rc = sdev->scsi_dh_data->scsi_dh->check_sense(sdev, &sshdr); | |
331 | if (rc != SCSI_RETURN_NOT_HANDLED) | |
332 | return rc; | |
333 | /* handler does not care. Drop down to default handling */ | |
334 | } | |
335 | ||
1da177e4 LT |
336 | /* |
337 | * Previous logic looked for FILEMARK, EOM or ILI which are | |
338 | * mainly associated with tapes and returned SUCCESS. | |
339 | */ | |
340 | if (sshdr.response_code == 0x70) { | |
341 | /* fixed format */ | |
342 | if (scmd->sense_buffer[2] & 0xe0) | |
343 | return SUCCESS; | |
344 | } else { | |
345 | /* | |
346 | * descriptor format: look for "stream commands sense data | |
347 | * descriptor" (see SSC-3). Assume single sense data | |
348 | * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG. | |
349 | */ | |
350 | if ((sshdr.additional_length > 3) && | |
351 | (scmd->sense_buffer[8] == 0x4) && | |
352 | (scmd->sense_buffer[11] & 0xe0)) | |
353 | return SUCCESS; | |
354 | } | |
355 | ||
356 | switch (sshdr.sense_key) { | |
357 | case NO_SENSE: | |
358 | return SUCCESS; | |
359 | case RECOVERED_ERROR: | |
360 | return /* soft_error */ SUCCESS; | |
361 | ||
362 | case ABORTED_COMMAND: | |
511e44f4 MP |
363 | if (sshdr.asc == 0x10) /* DIF */ |
364 | return SUCCESS; | |
365 | ||
1da177e4 LT |
366 | return NEEDS_RETRY; |
367 | case NOT_READY: | |
368 | case UNIT_ATTENTION: | |
369 | /* | |
370 | * if we are expecting a cc/ua because of a bus reset that we | |
371 | * performed, treat this just as a retry. otherwise this is | |
372 | * information that we should pass up to the upper-level driver | |
373 | * so that we can deal with it there. | |
374 | */ | |
375 | if (scmd->device->expecting_cc_ua) { | |
dfcf7775 TH |
376 | /* |
377 | * Because some device does not queue unit | |
378 | * attentions correctly, we carefully check | |
379 | * additional sense code and qualifier so as | |
380 | * not to squash media change unit attention. | |
381 | */ | |
382 | if (sshdr.asc != 0x28 || sshdr.ascq != 0x00) { | |
383 | scmd->device->expecting_cc_ua = 0; | |
384 | return NEEDS_RETRY; | |
385 | } | |
1da177e4 | 386 | } |
279afdfe EM |
387 | /* |
388 | * we might also expect a cc/ua if another LUN on the target | |
389 | * reported a UA with an ASC/ASCQ of 3F 0E - | |
390 | * REPORTED LUNS DATA HAS CHANGED. | |
391 | */ | |
392 | if (scmd->device->sdev_target->expecting_lun_change && | |
393 | sshdr.asc == 0x3f && sshdr.ascq == 0x0e) | |
394 | return NEEDS_RETRY; | |
1da177e4 | 395 | /* |
0bf8c869 | 396 | * if the device is in the process of becoming ready, we |
1da177e4 LT |
397 | * should retry. |
398 | */ | |
399 | if ((sshdr.asc == 0x04) && (sshdr.ascq == 0x01)) | |
400 | return NEEDS_RETRY; | |
401 | /* | |
402 | * if the device is not started, we need to wake | |
403 | * the error handler to start the motor | |
404 | */ | |
405 | if (scmd->device->allow_restart && | |
406 | (sshdr.asc == 0x04) && (sshdr.ascq == 0x02)) | |
407 | return FAILED; | |
02e031cb CH |
408 | /* |
409 | * Pass the UA upwards for a determination in the completion | |
410 | * functions. | |
411 | */ | |
412 | return SUCCESS; | |
1da177e4 | 413 | |
63583cca | 414 | /* these are not supported */ |
a9d6ceb8 HR |
415 | case DATA_PROTECT: |
416 | if (sshdr.asc == 0x27 && sshdr.ascq == 0x07) { | |
417 | /* Thin provisioning hard threshold reached */ | |
418 | set_host_byte(scmd, DID_ALLOC_FAILURE); | |
419 | return SUCCESS; | |
420 | } | |
1da177e4 LT |
421 | case COPY_ABORTED: |
422 | case VOLUME_OVERFLOW: | |
423 | case MISCOMPARE: | |
63583cca | 424 | case BLANK_CHECK: |
87f14e65 HR |
425 | set_host_byte(scmd, DID_TARGET_FAILURE); |
426 | return SUCCESS; | |
1da177e4 LT |
427 | |
428 | case MEDIUM_ERROR: | |
fd1b494d LT |
429 | if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */ |
430 | sshdr.asc == 0x13 || /* AMNF DATA FIELD */ | |
431 | sshdr.asc == 0x14) { /* RECORD NOT FOUND */ | |
7e782af5 | 432 | set_host_byte(scmd, DID_MEDIUM_ERROR); |
87f14e65 | 433 | return SUCCESS; |
fd1b494d | 434 | } |
1da177e4 LT |
435 | return NEEDS_RETRY; |
436 | ||
437 | case HARDWARE_ERROR: | |
438 | if (scmd->device->retry_hwerror) | |
bb0003c1 | 439 | return ADD_TO_MLQUEUE; |
1da177e4 | 440 | else |
87f14e65 | 441 | set_host_byte(scmd, DID_TARGET_FAILURE); |
1da177e4 LT |
442 | |
443 | case ILLEGAL_REQUEST: | |
47ac56db MS |
444 | if (sshdr.asc == 0x20 || /* Invalid command operation code */ |
445 | sshdr.asc == 0x21 || /* Logical block address out of range */ | |
446 | sshdr.asc == 0x24 || /* Invalid field in cdb */ | |
447 | sshdr.asc == 0x26) { /* Parameter value invalid */ | |
87f14e65 | 448 | set_host_byte(scmd, DID_TARGET_FAILURE); |
47ac56db MS |
449 | } |
450 | return SUCCESS; | |
451 | ||
1da177e4 LT |
452 | default: |
453 | return SUCCESS; | |
454 | } | |
455 | } | |
456 | ||
4a84067d VD |
457 | static void scsi_handle_queue_ramp_up(struct scsi_device *sdev) |
458 | { | |
459 | struct scsi_host_template *sht = sdev->host->hostt; | |
460 | struct scsi_device *tmp_sdev; | |
461 | ||
462 | if (!sht->change_queue_depth || | |
463 | sdev->queue_depth >= sdev->max_queue_depth) | |
464 | return; | |
465 | ||
466 | if (time_before(jiffies, | |
467 | sdev->last_queue_ramp_up + sdev->queue_ramp_up_period)) | |
468 | return; | |
469 | ||
470 | if (time_before(jiffies, | |
471 | sdev->last_queue_full_time + sdev->queue_ramp_up_period)) | |
472 | return; | |
473 | ||
474 | /* | |
475 | * Walk all devices of a target and do | |
476 | * ramp up on them. | |
477 | */ | |
478 | shost_for_each_device(tmp_sdev, sdev->host) { | |
479 | if (tmp_sdev->channel != sdev->channel || | |
480 | tmp_sdev->id != sdev->id || | |
481 | tmp_sdev->queue_depth == sdev->max_queue_depth) | |
482 | continue; | |
483 | /* | |
484 | * call back into LLD to increase queue_depth by one | |
485 | * with ramp up reason code. | |
486 | */ | |
487 | sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1, | |
488 | SCSI_QDEPTH_RAMP_UP); | |
489 | sdev->last_queue_ramp_up = jiffies; | |
490 | } | |
491 | } | |
492 | ||
42a6a918 MC |
493 | static void scsi_handle_queue_full(struct scsi_device *sdev) |
494 | { | |
495 | struct scsi_host_template *sht = sdev->host->hostt; | |
496 | struct scsi_device *tmp_sdev; | |
497 | ||
498 | if (!sht->change_queue_depth) | |
499 | return; | |
500 | ||
501 | shost_for_each_device(tmp_sdev, sdev->host) { | |
502 | if (tmp_sdev->channel != sdev->channel || | |
503 | tmp_sdev->id != sdev->id) | |
504 | continue; | |
505 | /* | |
506 | * We do not know the number of commands that were at | |
507 | * the device when we got the queue full so we start | |
508 | * from the highest possible value and work our way down. | |
509 | */ | |
510 | sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth - 1, | |
511 | SCSI_QDEPTH_QFULL); | |
512 | } | |
513 | } | |
514 | ||
1da177e4 LT |
515 | /** |
516 | * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD. | |
517 | * @scmd: SCSI cmd to examine. | |
518 | * | |
519 | * Notes: | |
520 | * This is *only* called when we are examining the status of commands | |
521 | * queued during error recovery. the main difference here is that we | |
522 | * don't allow for the possibility of retries here, and we are a lot | |
523 | * more restrictive about what we consider acceptable. | |
dc8875e1 | 524 | */ |
1da177e4 LT |
525 | static int scsi_eh_completed_normally(struct scsi_cmnd *scmd) |
526 | { | |
527 | /* | |
528 | * first check the host byte, to see if there is anything in there | |
529 | * that would indicate what we need to do. | |
530 | */ | |
531 | if (host_byte(scmd->result) == DID_RESET) { | |
532 | /* | |
533 | * rats. we are already in the error handler, so we now | |
534 | * get to try and figure out what to do next. if the sense | |
535 | * is valid, we have a pretty good idea of what to do. | |
536 | * if not, we mark it as FAILED. | |
537 | */ | |
538 | return scsi_check_sense(scmd); | |
539 | } | |
540 | if (host_byte(scmd->result) != DID_OK) | |
541 | return FAILED; | |
542 | ||
543 | /* | |
544 | * next, check the message byte. | |
545 | */ | |
546 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
547 | return FAILED; | |
548 | ||
549 | /* | |
550 | * now, check the status byte to see if this indicates | |
551 | * anything special. | |
552 | */ | |
553 | switch (status_byte(scmd->result)) { | |
554 | case GOOD: | |
4a84067d | 555 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 LT |
556 | case COMMAND_TERMINATED: |
557 | return SUCCESS; | |
558 | case CHECK_CONDITION: | |
559 | return scsi_check_sense(scmd); | |
560 | case CONDITION_GOOD: | |
561 | case INTERMEDIATE_GOOD: | |
562 | case INTERMEDIATE_C_GOOD: | |
563 | /* | |
564 | * who knows? FIXME(eric) | |
565 | */ | |
566 | return SUCCESS; | |
5f91bb05 | 567 | case RESERVATION_CONFLICT: |
67110dfd JB |
568 | if (scmd->cmnd[0] == TEST_UNIT_READY) |
569 | /* it is a success, we probed the device and | |
570 | * found it */ | |
571 | return SUCCESS; | |
572 | /* otherwise, we failed to send the command */ | |
573 | return FAILED; | |
1da177e4 | 574 | case QUEUE_FULL: |
42a6a918 MC |
575 | scsi_handle_queue_full(scmd->device); |
576 | /* fall through */ | |
577 | case BUSY: | |
3eb3a928 | 578 | return NEEDS_RETRY; |
1da177e4 LT |
579 | default: |
580 | return FAILED; | |
581 | } | |
582 | return FAILED; | |
583 | } | |
584 | ||
1da177e4 LT |
585 | /** |
586 | * scsi_eh_done - Completion function for error handling. | |
587 | * @scmd: Cmd that is done. | |
dc8875e1 | 588 | */ |
1da177e4 LT |
589 | static void scsi_eh_done(struct scsi_cmnd *scmd) |
590 | { | |
0bf8c869 | 591 | struct completion *eh_action; |
85631672 | 592 | |
7dfdc9a5 CH |
593 | SCSI_LOG_ERROR_RECOVERY(3, |
594 | printk("%s scmd: %p result: %x\n", | |
cadbd4a5 | 595 | __func__, scmd, scmd->result)); |
85631672 MR |
596 | |
597 | eh_action = scmd->device->host->eh_action; | |
598 | if (eh_action) | |
599 | complete(eh_action); | |
1da177e4 LT |
600 | } |
601 | ||
292148f8 BK |
602 | /** |
603 | * scsi_try_host_reset - ask host adapter to reset itself | |
c2b3ebd0 | 604 | * @scmd: SCSI cmd to send host reset. |
dc8875e1 | 605 | */ |
292148f8 BK |
606 | static int scsi_try_host_reset(struct scsi_cmnd *scmd) |
607 | { | |
608 | unsigned long flags; | |
609 | int rtn; | |
0bf8c869 JJ |
610 | struct Scsi_Host *host = scmd->device->host; |
611 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 BK |
612 | |
613 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Host RST\n", | |
cadbd4a5 | 614 | __func__)); |
292148f8 | 615 | |
0bf8c869 | 616 | if (!hostt->eh_host_reset_handler) |
292148f8 BK |
617 | return FAILED; |
618 | ||
0bf8c869 | 619 | rtn = hostt->eh_host_reset_handler(scmd); |
292148f8 BK |
620 | |
621 | if (rtn == SUCCESS) { | |
0bf8c869 | 622 | if (!hostt->skip_settle_delay) |
292148f8 | 623 | ssleep(HOST_RESET_SETTLE_TIME); |
0bf8c869 JJ |
624 | spin_lock_irqsave(host->host_lock, flags); |
625 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
626 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
627 | } |
628 | ||
629 | return rtn; | |
630 | } | |
631 | ||
632 | /** | |
633 | * scsi_try_bus_reset - ask host to perform a bus reset | |
634 | * @scmd: SCSI cmd to send bus reset. | |
dc8875e1 | 635 | */ |
292148f8 BK |
636 | static int scsi_try_bus_reset(struct scsi_cmnd *scmd) |
637 | { | |
638 | unsigned long flags; | |
639 | int rtn; | |
0bf8c869 JJ |
640 | struct Scsi_Host *host = scmd->device->host; |
641 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 BK |
642 | |
643 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Bus RST\n", | |
cadbd4a5 | 644 | __func__)); |
292148f8 | 645 | |
0bf8c869 | 646 | if (!hostt->eh_bus_reset_handler) |
292148f8 BK |
647 | return FAILED; |
648 | ||
0bf8c869 | 649 | rtn = hostt->eh_bus_reset_handler(scmd); |
292148f8 BK |
650 | |
651 | if (rtn == SUCCESS) { | |
0bf8c869 | 652 | if (!hostt->skip_settle_delay) |
292148f8 | 653 | ssleep(BUS_RESET_SETTLE_TIME); |
0bf8c869 JJ |
654 | spin_lock_irqsave(host->host_lock, flags); |
655 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
656 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
657 | } |
658 | ||
659 | return rtn; | |
660 | } | |
661 | ||
30bd7df8 MC |
662 | static void __scsi_report_device_reset(struct scsi_device *sdev, void *data) |
663 | { | |
664 | sdev->was_reset = 1; | |
665 | sdev->expecting_cc_ua = 1; | |
666 | } | |
667 | ||
668 | /** | |
669 | * scsi_try_target_reset - Ask host to perform a target reset | |
670 | * @scmd: SCSI cmd used to send a target reset | |
671 | * | |
672 | * Notes: | |
673 | * There is no timeout for this operation. if this operation is | |
674 | * unreliable for a given host, then the host itself needs to put a | |
675 | * timer on it, and set the host back to a consistent state prior to | |
676 | * returning. | |
677 | */ | |
678 | static int scsi_try_target_reset(struct scsi_cmnd *scmd) | |
679 | { | |
680 | unsigned long flags; | |
681 | int rtn; | |
0bf8c869 JJ |
682 | struct Scsi_Host *host = scmd->device->host; |
683 | struct scsi_host_template *hostt = host->hostt; | |
30bd7df8 | 684 | |
0bf8c869 | 685 | if (!hostt->eh_target_reset_handler) |
30bd7df8 MC |
686 | return FAILED; |
687 | ||
0bf8c869 | 688 | rtn = hostt->eh_target_reset_handler(scmd); |
30bd7df8 | 689 | if (rtn == SUCCESS) { |
0bf8c869 | 690 | spin_lock_irqsave(host->host_lock, flags); |
30bd7df8 MC |
691 | __starget_for_each_device(scsi_target(scmd->device), NULL, |
692 | __scsi_report_device_reset); | |
0bf8c869 | 693 | spin_unlock_irqrestore(host->host_lock, flags); |
30bd7df8 MC |
694 | } |
695 | ||
696 | return rtn; | |
697 | } | |
698 | ||
292148f8 BK |
699 | /** |
700 | * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev | |
701 | * @scmd: SCSI cmd used to send BDR | |
702 | * | |
703 | * Notes: | |
704 | * There is no timeout for this operation. if this operation is | |
705 | * unreliable for a given host, then the host itself needs to put a | |
706 | * timer on it, and set the host back to a consistent state prior to | |
707 | * returning. | |
dc8875e1 | 708 | */ |
292148f8 BK |
709 | static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd) |
710 | { | |
711 | int rtn; | |
0bf8c869 | 712 | struct scsi_host_template *hostt = scmd->device->host->hostt; |
292148f8 | 713 | |
0bf8c869 | 714 | if (!hostt->eh_device_reset_handler) |
292148f8 BK |
715 | return FAILED; |
716 | ||
0bf8c869 | 717 | rtn = hostt->eh_device_reset_handler(scmd); |
30bd7df8 MC |
718 | if (rtn == SUCCESS) |
719 | __scsi_report_device_reset(scmd->device, NULL); | |
292148f8 BK |
720 | return rtn; |
721 | } | |
722 | ||
0bf8c869 | 723 | static int scsi_try_to_abort_cmd(struct scsi_host_template *hostt, struct scsi_cmnd *scmd) |
292148f8 | 724 | { |
0bf8c869 | 725 | if (!hostt->eh_abort_handler) |
292148f8 BK |
726 | return FAILED; |
727 | ||
0bf8c869 | 728 | return hostt->eh_abort_handler(scmd); |
292148f8 BK |
729 | } |
730 | ||
292148f8 BK |
731 | static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd) |
732 | { | |
0bf8c869 | 733 | if (scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd) != SUCCESS) |
292148f8 | 734 | if (scsi_try_bus_device_reset(scmd) != SUCCESS) |
30bd7df8 MC |
735 | if (scsi_try_target_reset(scmd) != SUCCESS) |
736 | if (scsi_try_bus_reset(scmd) != SUCCESS) | |
737 | scsi_try_host_reset(scmd); | |
292148f8 BK |
738 | } |
739 | ||
1da177e4 | 740 | /** |
3b729f76 | 741 | * scsi_eh_prep_cmnd - Save a scsi command info as part of error recovery |
2dc611de | 742 | * @scmd: SCSI command structure to hijack |
e1c23468 | 743 | * @ses: structure to save restore information |
55db6c1b | 744 | * @cmnd: CDB to send. Can be NULL if no new cmnd is needed |
64a87b24 | 745 | * @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB) |
55db6c1b | 746 | * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored) |
2dc611de | 747 | * |
e1c23468 | 748 | * This function is used to save a scsi command information before re-execution |
55db6c1b BH |
749 | * as part of the error recovery process. If @sense_bytes is 0 the command |
750 | * sent must be one that does not transfer any data. If @sense_bytes != 0 | |
751 | * @cmnd is ignored and this functions sets up a REQUEST_SENSE command | |
752 | * and cmnd buffers to read @sense_bytes into @scmd->sense_buffer. | |
dc8875e1 | 753 | */ |
e1c23468 BH |
754 | void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, |
755 | unsigned char *cmnd, int cmnd_size, unsigned sense_bytes) | |
1da177e4 | 756 | { |
f59114b7 | 757 | struct scsi_device *sdev = scmd->device; |
1da177e4 | 758 | |
631c228c CH |
759 | /* |
760 | * We need saved copies of a number of fields - this is because | |
761 | * error handling may need to overwrite these with different values | |
762 | * to run different commands, and once error handling is complete, | |
763 | * we will need to restore these values prior to running the actual | |
764 | * command. | |
765 | */ | |
e1c23468 | 766 | ses->cmd_len = scmd->cmd_len; |
64a87b24 | 767 | ses->cmnd = scmd->cmnd; |
e1c23468 | 768 | ses->data_direction = scmd->sc_data_direction; |
30b0c37b | 769 | ses->sdb = scmd->sdb; |
6f9a35e2 | 770 | ses->next_rq = scmd->request->next_rq; |
e1c23468 | 771 | ses->result = scmd->result; |
12265709 | 772 | ses->underflow = scmd->underflow; |
db007fc5 | 773 | ses->prot_op = scmd->prot_op; |
631c228c | 774 | |
db007fc5 | 775 | scmd->prot_op = SCSI_PROT_NORMAL; |
64a87b24 BH |
776 | scmd->cmnd = ses->eh_cmnd; |
777 | memset(scmd->cmnd, 0, BLK_MAX_CDB); | |
30b0c37b | 778 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
6f9a35e2 | 779 | scmd->request->next_rq = NULL; |
30b0c37b | 780 | |
55db6c1b | 781 | if (sense_bytes) { |
30b0c37b BH |
782 | scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE, |
783 | sense_bytes); | |
e1c23468 | 784 | sg_init_one(&ses->sense_sgl, scmd->sense_buffer, |
30b0c37b BH |
785 | scmd->sdb.length); |
786 | scmd->sdb.table.sgl = &ses->sense_sgl; | |
55db6c1b | 787 | scmd->sc_data_direction = DMA_FROM_DEVICE; |
30b0c37b | 788 | scmd->sdb.table.nents = 1; |
55db6c1b | 789 | scmd->cmnd[0] = REQUEST_SENSE; |
30b0c37b | 790 | scmd->cmnd[4] = scmd->sdb.length; |
55db6c1b | 791 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); |
631c228c | 792 | } else { |
631c228c | 793 | scmd->sc_data_direction = DMA_NONE; |
55db6c1b | 794 | if (cmnd) { |
64a87b24 | 795 | BUG_ON(cmnd_size > BLK_MAX_CDB); |
55db6c1b BH |
796 | memcpy(scmd->cmnd, cmnd, cmnd_size); |
797 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); | |
798 | } | |
631c228c CH |
799 | } |
800 | ||
801 | scmd->underflow = 0; | |
631c228c | 802 | |
55db6c1b | 803 | if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN) |
1da177e4 | 804 | scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) | |
f59114b7 | 805 | (sdev->lun << 5 & 0xe0); |
1da177e4 | 806 | |
631c228c CH |
807 | /* |
808 | * Zero the sense buffer. The scsi spec mandates that any | |
809 | * untransferred sense data should be interpreted as being zero. | |
810 | */ | |
b80ca4f7 | 811 | memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); |
e1c23468 BH |
812 | } |
813 | EXPORT_SYMBOL(scsi_eh_prep_cmnd); | |
814 | ||
815 | /** | |
3b729f76 | 816 | * scsi_eh_restore_cmnd - Restore a scsi command info as part of error recovery |
e1c23468 | 817 | * @scmd: SCSI command structure to restore |
477e608c | 818 | * @ses: saved information from a coresponding call to scsi_eh_prep_cmnd |
e1c23468 | 819 | * |
477e608c | 820 | * Undo any damage done by above scsi_eh_prep_cmnd(). |
dc8875e1 | 821 | */ |
e1c23468 BH |
822 | void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses) |
823 | { | |
824 | /* | |
825 | * Restore original data | |
826 | */ | |
827 | scmd->cmd_len = ses->cmd_len; | |
64a87b24 | 828 | scmd->cmnd = ses->cmnd; |
e1c23468 | 829 | scmd->sc_data_direction = ses->data_direction; |
30b0c37b | 830 | scmd->sdb = ses->sdb; |
6f9a35e2 | 831 | scmd->request->next_rq = ses->next_rq; |
e1c23468 | 832 | scmd->result = ses->result; |
12265709 | 833 | scmd->underflow = ses->underflow; |
db007fc5 | 834 | scmd->prot_op = ses->prot_op; |
e1c23468 BH |
835 | } |
836 | EXPORT_SYMBOL(scsi_eh_restore_cmnd); | |
631c228c | 837 | |
e1c23468 | 838 | /** |
3b729f76 | 839 | * scsi_send_eh_cmnd - submit a scsi command as part of error recovery |
e1c23468 BH |
840 | * @scmd: SCSI command structure to hijack |
841 | * @cmnd: CDB to send | |
842 | * @cmnd_size: size in bytes of @cmnd | |
843 | * @timeout: timeout for this request | |
844 | * @sense_bytes: size of sense data to copy or 0 | |
845 | * | |
846 | * This function is used to send a scsi command down to a target device | |
847 | * as part of the error recovery process. See also scsi_eh_prep_cmnd() above. | |
848 | * | |
849 | * Return value: | |
850 | * SUCCESS or FAILED or NEEDS_RETRY | |
dc8875e1 | 851 | */ |
e1c23468 BH |
852 | static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd, |
853 | int cmnd_size, int timeout, unsigned sense_bytes) | |
854 | { | |
855 | struct scsi_device *sdev = scmd->device; | |
856 | struct Scsi_Host *shost = sdev->host; | |
857 | DECLARE_COMPLETION_ONSTACK(done); | |
fc73648a | 858 | unsigned long timeleft = timeout; |
e1c23468 | 859 | struct scsi_eh_save ses; |
fc73648a | 860 | const unsigned long stall_for = msecs_to_jiffies(100); |
e1c23468 BH |
861 | int rtn; |
862 | ||
fc73648a | 863 | retry: |
e1c23468 | 864 | scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes); |
7dfdc9a5 | 865 | shost->eh_action = &done; |
1da177e4 | 866 | |
1da177e4 | 867 | scsi_log_send(scmd); |
f281233d | 868 | scmd->scsi_done = scsi_eh_done; |
fc73648a HR |
869 | rtn = shost->hostt->queuecommand(shost, scmd); |
870 | if (rtn) { | |
871 | if (timeleft > stall_for) { | |
872 | scsi_eh_restore_cmnd(scmd, &ses); | |
873 | timeleft -= stall_for; | |
874 | msleep(jiffies_to_msecs(stall_for)); | |
875 | goto retry; | |
876 | } | |
877 | /* signal not to enter either branch of the if () below */ | |
878 | timeleft = 0; | |
879 | rtn = NEEDS_RETRY; | |
880 | } else { | |
881 | timeleft = wait_for_completion_timeout(&done, timeout); | |
882 | } | |
1da177e4 | 883 | |
f59114b7 | 884 | shost->eh_action = NULL; |
1da177e4 | 885 | |
fc73648a | 886 | scsi_log_completion(scmd, rtn); |
1da177e4 | 887 | |
7dfdc9a5 CH |
888 | SCSI_LOG_ERROR_RECOVERY(3, |
889 | printk("%s: scmd: %p, timeleft: %ld\n", | |
cadbd4a5 | 890 | __func__, scmd, timeleft)); |
1da177e4 LT |
891 | |
892 | /* | |
fc73648a HR |
893 | * If there is time left scsi_eh_done got called, and we will examine |
894 | * the actual status codes to see whether the command actually did | |
895 | * complete normally, else if we have a zero return and no time left, | |
896 | * the command must still be pending, so abort it and return FAILED. | |
897 | * If we never actually managed to issue the command, because | |
898 | * ->queuecommand() kept returning non zero, use the rtn = FAILED | |
899 | * value above (so don't execute either branch of the if) | |
1da177e4 | 900 | */ |
7dfdc9a5 | 901 | if (timeleft) { |
1da177e4 LT |
902 | rtn = scsi_eh_completed_normally(scmd); |
903 | SCSI_LOG_ERROR_RECOVERY(3, | |
904 | printk("%s: scsi_eh_completed_normally %x\n", | |
cadbd4a5 | 905 | __func__, rtn)); |
7dfdc9a5 | 906 | |
1da177e4 LT |
907 | switch (rtn) { |
908 | case SUCCESS: | |
909 | case NEEDS_RETRY: | |
910 | case FAILED: | |
911 | break; | |
6e883b0e HR |
912 | case ADD_TO_MLQUEUE: |
913 | rtn = NEEDS_RETRY; | |
914 | break; | |
1da177e4 LT |
915 | default: |
916 | rtn = FAILED; | |
917 | break; | |
918 | } | |
fc73648a | 919 | } else if (!rtn) { |
292148f8 | 920 | scsi_abort_eh_cmnd(scmd); |
7dfdc9a5 | 921 | rtn = FAILED; |
1da177e4 LT |
922 | } |
923 | ||
e1c23468 | 924 | scsi_eh_restore_cmnd(scmd, &ses); |
18a4d0a2 | 925 | |
329a402c LZ |
926 | if (scmd->request->cmd_type != REQ_TYPE_BLOCK_PC) { |
927 | struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd); | |
928 | if (sdrv->eh_action) | |
929 | rtn = sdrv->eh_action(scmd, cmnd, cmnd_size, rtn); | |
930 | } | |
18a4d0a2 | 931 | |
1da177e4 LT |
932 | return rtn; |
933 | } | |
934 | ||
935 | /** | |
936 | * scsi_request_sense - Request sense data from a particular target. | |
937 | * @scmd: SCSI cmd for request sense. | |
938 | * | |
939 | * Notes: | |
940 | * Some hosts automatically obtain this information, others require | |
941 | * that we obtain it on our own. This function will *not* return until | |
942 | * the command either times out, or it completes. | |
dc8875e1 | 943 | */ |
1da177e4 LT |
944 | static int scsi_request_sense(struct scsi_cmnd *scmd) |
945 | { | |
0816c925 | 946 | return scsi_send_eh_cmnd(scmd, NULL, 0, scmd->device->eh_timeout, ~0); |
1da177e4 LT |
947 | } |
948 | ||
949 | /** | |
950 | * scsi_eh_finish_cmd - Handle a cmd that eh is finished with. | |
951 | * @scmd: Original SCSI cmd that eh has finished. | |
952 | * @done_q: Queue for processed commands. | |
953 | * | |
954 | * Notes: | |
955 | * We don't want to use the normal command completion while we are are | |
956 | * still handling errors - it may cause other commands to be queued, | |
eb44820c | 957 | * and that would disturb what we are doing. Thus we really want to |
1da177e4 LT |
958 | * keep a list of pending commands for final completion, and once we |
959 | * are ready to leave error handling we handle completion for real. | |
dc8875e1 | 960 | */ |
041c5fc3 | 961 | void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q) |
1da177e4 LT |
962 | { |
963 | scmd->device->host->host_failed--; | |
3111b0d1 | 964 | scmd->eh_eflags = 0; |
1da177e4 LT |
965 | list_move_tail(&scmd->eh_entry, done_q); |
966 | } | |
041c5fc3 | 967 | EXPORT_SYMBOL(scsi_eh_finish_cmd); |
1da177e4 LT |
968 | |
969 | /** | |
970 | * scsi_eh_get_sense - Get device sense data. | |
971 | * @work_q: Queue of commands to process. | |
eb44820c | 972 | * @done_q: Queue of processed commands. |
1da177e4 LT |
973 | * |
974 | * Description: | |
975 | * See if we need to request sense information. if so, then get it | |
0bf8c869 | 976 | * now, so we have a better idea of what to do. |
1da177e4 LT |
977 | * |
978 | * Notes: | |
979 | * This has the unfortunate side effect that if a shost adapter does | |
eb44820c | 980 | * not automatically request sense information, we end up shutting |
1da177e4 LT |
981 | * it down before we request it. |
982 | * | |
983 | * All drivers should request sense information internally these days, | |
984 | * so for now all I have to say is tough noogies if you end up in here. | |
985 | * | |
986 | * XXX: Long term this code should go away, but that needs an audit of | |
987 | * all LLDDs first. | |
dc8875e1 | 988 | */ |
dca84e46 DW |
989 | int scsi_eh_get_sense(struct list_head *work_q, |
990 | struct list_head *done_q) | |
1da177e4 | 991 | { |
937abeaa | 992 | struct scsi_cmnd *scmd, *next; |
1da177e4 LT |
993 | int rtn; |
994 | ||
937abeaa | 995 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 996 | if ((scmd->eh_eflags & SCSI_EH_CANCEL_CMD) || |
1da177e4 LT |
997 | SCSI_SENSE_VALID(scmd)) |
998 | continue; | |
999 | ||
3bf743e7 JG |
1000 | SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd, |
1001 | "%s: requesting sense\n", | |
1002 | current->comm)); | |
1da177e4 LT |
1003 | rtn = scsi_request_sense(scmd); |
1004 | if (rtn != SUCCESS) | |
1005 | continue; | |
1006 | ||
1007 | SCSI_LOG_ERROR_RECOVERY(3, printk("sense requested for %p" | |
1008 | " result %x\n", scmd, | |
1009 | scmd->result)); | |
1010 | SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense("bh", scmd)); | |
1011 | ||
1012 | rtn = scsi_decide_disposition(scmd); | |
1013 | ||
1014 | /* | |
1015 | * if the result was normal, then just pass it along to the | |
1016 | * upper level. | |
1017 | */ | |
1018 | if (rtn == SUCCESS) | |
1019 | /* we don't want this command reissued, just | |
1020 | * finished with the sense data, so set | |
1021 | * retries to the max allowed to ensure it | |
1022 | * won't get reissued */ | |
1023 | scmd->retries = scmd->allowed; | |
1024 | else if (rtn != NEEDS_RETRY) | |
1025 | continue; | |
1026 | ||
1027 | scsi_eh_finish_cmd(scmd, done_q); | |
1028 | } | |
1029 | ||
1030 | return list_empty(work_q); | |
1031 | } | |
dca84e46 | 1032 | EXPORT_SYMBOL_GPL(scsi_eh_get_sense); |
1da177e4 | 1033 | |
1da177e4 LT |
1034 | /** |
1035 | * scsi_eh_tur - Send TUR to device. | |
eb44820c | 1036 | * @scmd: &scsi_cmnd to send TUR |
1da177e4 LT |
1037 | * |
1038 | * Return value: | |
1039 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1040 | */ |
1da177e4 LT |
1041 | static int scsi_eh_tur(struct scsi_cmnd *scmd) |
1042 | { | |
1043 | static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0}; | |
1044 | int retry_cnt = 1, rtn; | |
1045 | ||
1046 | retry_tur: | |
0816c925 MP |
1047 | rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, |
1048 | scmd->device->eh_timeout, 0); | |
1da177e4 | 1049 | |
1da177e4 | 1050 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd %p rtn %x\n", |
cadbd4a5 | 1051 | __func__, scmd, rtn)); |
631c228c CH |
1052 | |
1053 | switch (rtn) { | |
1054 | case NEEDS_RETRY: | |
1da177e4 LT |
1055 | if (retry_cnt--) |
1056 | goto retry_tur; | |
631c228c CH |
1057 | /*FALLTHRU*/ |
1058 | case SUCCESS: | |
e47373ec | 1059 | return 0; |
631c228c CH |
1060 | default: |
1061 | return 1; | |
e47373ec | 1062 | } |
1da177e4 LT |
1063 | } |
1064 | ||
3eef6257 DJ |
1065 | /** |
1066 | * scsi_eh_test_devices - check if devices are responding from error recovery. | |
1067 | * @cmd_list: scsi commands in error recovery. | |
1068 | * @work_q: queue for commands which still need more error recovery | |
1069 | * @done_q: queue for commands which are finished | |
1070 | * @try_stu: boolean on if a STU command should be tried in addition to TUR. | |
1071 | * | |
1072 | * Decription: | |
1073 | * Tests if devices are in a working state. Commands to devices now in | |
1074 | * a working state are sent to the done_q while commands to devices which | |
1075 | * are still failing to respond are returned to the work_q for more | |
1076 | * processing. | |
1077 | **/ | |
1078 | static int scsi_eh_test_devices(struct list_head *cmd_list, | |
1079 | struct list_head *work_q, | |
1080 | struct list_head *done_q, int try_stu) | |
1081 | { | |
1082 | struct scsi_cmnd *scmd, *next; | |
1083 | struct scsi_device *sdev; | |
1084 | int finish_cmds; | |
1085 | ||
1086 | while (!list_empty(cmd_list)) { | |
1087 | scmd = list_entry(cmd_list->next, struct scsi_cmnd, eh_entry); | |
1088 | sdev = scmd->device; | |
1089 | ||
1090 | finish_cmds = !scsi_device_online(scmd->device) || | |
1091 | (try_stu && !scsi_eh_try_stu(scmd) && | |
1092 | !scsi_eh_tur(scmd)) || | |
1093 | !scsi_eh_tur(scmd); | |
1094 | ||
1095 | list_for_each_entry_safe(scmd, next, cmd_list, eh_entry) | |
1096 | if (scmd->device == sdev) { | |
1097 | if (finish_cmds) | |
1098 | scsi_eh_finish_cmd(scmd, done_q); | |
1099 | else | |
1100 | list_move_tail(&scmd->eh_entry, work_q); | |
1101 | } | |
1102 | } | |
1103 | return list_empty(work_q); | |
1104 | } | |
1105 | ||
1106 | ||
1da177e4 | 1107 | /** |
eb44820c RL |
1108 | * scsi_eh_abort_cmds - abort pending commands. |
1109 | * @work_q: &list_head for pending commands. | |
1110 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1111 | * |
1112 | * Decription: | |
1113 | * Try and see whether or not it makes sense to try and abort the | |
eb44820c RL |
1114 | * running command. This only works out to be the case if we have one |
1115 | * command that has timed out. If the command simply failed, it makes | |
1da177e4 LT |
1116 | * no sense to try and abort the command, since as far as the shost |
1117 | * adapter is concerned, it isn't running. | |
dc8875e1 | 1118 | */ |
1da177e4 LT |
1119 | static int scsi_eh_abort_cmds(struct list_head *work_q, |
1120 | struct list_head *done_q) | |
1121 | { | |
937abeaa | 1122 | struct scsi_cmnd *scmd, *next; |
3eef6257 | 1123 | LIST_HEAD(check_list); |
1da177e4 LT |
1124 | int rtn; |
1125 | ||
937abeaa | 1126 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 1127 | if (!(scmd->eh_eflags & SCSI_EH_CANCEL_CMD)) |
1da177e4 LT |
1128 | continue; |
1129 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting cmd:" | |
1130 | "0x%p\n", current->comm, | |
1131 | scmd)); | |
0bf8c869 | 1132 | rtn = scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd); |
2f2eb587 | 1133 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
3111b0d1 | 1134 | scmd->eh_eflags &= ~SCSI_EH_CANCEL_CMD; |
3eef6257 | 1135 | if (rtn == FAST_IO_FAIL) |
1da177e4 | 1136 | scsi_eh_finish_cmd(scmd, done_q); |
3eef6257 DJ |
1137 | else |
1138 | list_move_tail(&scmd->eh_entry, &check_list); | |
1da177e4 LT |
1139 | } else |
1140 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting" | |
1141 | " cmd failed:" | |
1142 | "0x%p\n", | |
1143 | current->comm, | |
1144 | scmd)); | |
1145 | } | |
1146 | ||
3eef6257 | 1147 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4 LT |
1148 | } |
1149 | ||
1da177e4 LT |
1150 | /** |
1151 | * scsi_eh_try_stu - Send START_UNIT to device. | |
eb44820c | 1152 | * @scmd: &scsi_cmnd to send START_UNIT |
1da177e4 LT |
1153 | * |
1154 | * Return value: | |
1155 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1156 | */ |
1da177e4 LT |
1157 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd) |
1158 | { | |
1159 | static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0}; | |
1da177e4 | 1160 | |
631c228c | 1161 | if (scmd->device->allow_restart) { |
ed773e66 BK |
1162 | int i, rtn = NEEDS_RETRY; |
1163 | ||
1164 | for (i = 0; rtn == NEEDS_RETRY && i < 2; i++) | |
9728c081 | 1165 | rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0); |
1da177e4 | 1166 | |
631c228c CH |
1167 | if (rtn == SUCCESS) |
1168 | return 0; | |
1169 | } | |
1da177e4 | 1170 | |
1da177e4 LT |
1171 | return 1; |
1172 | } | |
1173 | ||
1174 | /** | |
1175 | * scsi_eh_stu - send START_UNIT if needed | |
eb44820c RL |
1176 | * @shost: &scsi host being recovered. |
1177 | * @work_q: &list_head for pending commands. | |
1178 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1179 | * |
1180 | * Notes: | |
1181 | * If commands are failing due to not ready, initializing command required, | |
0bf8c869 | 1182 | * try revalidating the device, which will end up sending a start unit. |
dc8875e1 | 1183 | */ |
1da177e4 LT |
1184 | static int scsi_eh_stu(struct Scsi_Host *shost, |
1185 | struct list_head *work_q, | |
1186 | struct list_head *done_q) | |
1187 | { | |
937abeaa | 1188 | struct scsi_cmnd *scmd, *stu_scmd, *next; |
1da177e4 LT |
1189 | struct scsi_device *sdev; |
1190 | ||
1191 | shost_for_each_device(sdev, shost) { | |
1192 | stu_scmd = NULL; | |
1193 | list_for_each_entry(scmd, work_q, eh_entry) | |
1194 | if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) && | |
1195 | scsi_check_sense(scmd) == FAILED ) { | |
1196 | stu_scmd = scmd; | |
1197 | break; | |
1198 | } | |
1199 | ||
1200 | if (!stu_scmd) | |
1201 | continue; | |
1202 | ||
1203 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending START_UNIT to sdev:" | |
1204 | " 0x%p\n", current->comm, sdev)); | |
1205 | ||
1206 | if (!scsi_eh_try_stu(stu_scmd)) { | |
1207 | if (!scsi_device_online(sdev) || | |
1208 | !scsi_eh_tur(stu_scmd)) { | |
937abeaa CH |
1209 | list_for_each_entry_safe(scmd, next, |
1210 | work_q, eh_entry) { | |
1da177e4 LT |
1211 | if (scmd->device == sdev) |
1212 | scsi_eh_finish_cmd(scmd, done_q); | |
1213 | } | |
1214 | } | |
1215 | } else { | |
1216 | SCSI_LOG_ERROR_RECOVERY(3, | |
1217 | printk("%s: START_UNIT failed to sdev:" | |
1218 | " 0x%p\n", current->comm, sdev)); | |
1219 | } | |
1220 | } | |
1221 | ||
1222 | return list_empty(work_q); | |
1223 | } | |
1224 | ||
1225 | ||
1226 | /** | |
1227 | * scsi_eh_bus_device_reset - send bdr if needed | |
1228 | * @shost: scsi host being recovered. | |
eb44820c RL |
1229 | * @work_q: &list_head for pending commands. |
1230 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1231 | * |
1232 | * Notes: | |
eb44820c | 1233 | * Try a bus device reset. Still, look to see whether we have multiple |
1da177e4 LT |
1234 | * devices that are jammed or not - if we have multiple devices, it |
1235 | * makes no sense to try bus_device_reset - we really would need to try | |
0bf8c869 | 1236 | * a bus_reset instead. |
dc8875e1 | 1237 | */ |
1da177e4 LT |
1238 | static int scsi_eh_bus_device_reset(struct Scsi_Host *shost, |
1239 | struct list_head *work_q, | |
1240 | struct list_head *done_q) | |
1241 | { | |
937abeaa | 1242 | struct scsi_cmnd *scmd, *bdr_scmd, *next; |
1da177e4 LT |
1243 | struct scsi_device *sdev; |
1244 | int rtn; | |
1245 | ||
1246 | shost_for_each_device(sdev, shost) { | |
1247 | bdr_scmd = NULL; | |
1248 | list_for_each_entry(scmd, work_q, eh_entry) | |
1249 | if (scmd->device == sdev) { | |
1250 | bdr_scmd = scmd; | |
1251 | break; | |
1252 | } | |
1253 | ||
1254 | if (!bdr_scmd) | |
1255 | continue; | |
1256 | ||
1257 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BDR sdev:" | |
1258 | " 0x%p\n", current->comm, | |
1259 | sdev)); | |
1260 | rtn = scsi_try_bus_device_reset(bdr_scmd); | |
2f2eb587 | 1261 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
1da177e4 | 1262 | if (!scsi_device_online(sdev) || |
2f2eb587 | 1263 | rtn == FAST_IO_FAIL || |
1da177e4 | 1264 | !scsi_eh_tur(bdr_scmd)) { |
937abeaa CH |
1265 | list_for_each_entry_safe(scmd, next, |
1266 | work_q, eh_entry) { | |
1da177e4 LT |
1267 | if (scmd->device == sdev) |
1268 | scsi_eh_finish_cmd(scmd, | |
1269 | done_q); | |
1270 | } | |
1271 | } | |
1272 | } else { | |
1273 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BDR" | |
1274 | " failed sdev:" | |
1275 | "0x%p\n", | |
1276 | current->comm, | |
1277 | sdev)); | |
1278 | } | |
1279 | } | |
1280 | ||
1281 | return list_empty(work_q); | |
1282 | } | |
1283 | ||
30bd7df8 MC |
1284 | /** |
1285 | * scsi_eh_target_reset - send target reset if needed | |
1286 | * @shost: scsi host being recovered. | |
1287 | * @work_q: &list_head for pending commands. | |
1288 | * @done_q: &list_head for processed commands. | |
1289 | * | |
1290 | * Notes: | |
1291 | * Try a target reset. | |
1292 | */ | |
1293 | static int scsi_eh_target_reset(struct Scsi_Host *shost, | |
1294 | struct list_head *work_q, | |
1295 | struct list_head *done_q) | |
1296 | { | |
98db5195 | 1297 | LIST_HEAD(tmp_list); |
3eef6257 | 1298 | LIST_HEAD(check_list); |
30bd7df8 | 1299 | |
98db5195 JB |
1300 | list_splice_init(work_q, &tmp_list); |
1301 | ||
1302 | while (!list_empty(&tmp_list)) { | |
1303 | struct scsi_cmnd *next, *scmd; | |
1304 | int rtn; | |
1305 | unsigned int id; | |
1306 | ||
1307 | scmd = list_entry(tmp_list.next, struct scsi_cmnd, eh_entry); | |
1308 | id = scmd_id(scmd); | |
30bd7df8 MC |
1309 | |
1310 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending target reset " | |
1311 | "to target %d\n", | |
1312 | current->comm, id)); | |
98db5195 JB |
1313 | rtn = scsi_try_target_reset(scmd); |
1314 | if (rtn != SUCCESS && rtn != FAST_IO_FAIL) | |
30bd7df8 MC |
1315 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Target reset" |
1316 | " failed target: " | |
1317 | "%d\n", | |
1318 | current->comm, id)); | |
98db5195 JB |
1319 | list_for_each_entry_safe(scmd, next, &tmp_list, eh_entry) { |
1320 | if (scmd_id(scmd) != id) | |
1321 | continue; | |
1322 | ||
3eef6257 DJ |
1323 | if (rtn == SUCCESS) |
1324 | list_move_tail(&scmd->eh_entry, &check_list); | |
1325 | else if (rtn == FAST_IO_FAIL) | |
98db5195 JB |
1326 | scsi_eh_finish_cmd(scmd, done_q); |
1327 | else | |
1328 | /* push back on work queue for further processing */ | |
1329 | list_move(&scmd->eh_entry, work_q); | |
1330 | } | |
1331 | } | |
30bd7df8 | 1332 | |
3eef6257 | 1333 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
30bd7df8 MC |
1334 | } |
1335 | ||
1da177e4 | 1336 | /** |
0bf8c869 | 1337 | * scsi_eh_bus_reset - send a bus reset |
eb44820c RL |
1338 | * @shost: &scsi host being recovered. |
1339 | * @work_q: &list_head for pending commands. | |
1340 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1341 | */ |
1da177e4 LT |
1342 | static int scsi_eh_bus_reset(struct Scsi_Host *shost, |
1343 | struct list_head *work_q, | |
1344 | struct list_head *done_q) | |
1345 | { | |
937abeaa | 1346 | struct scsi_cmnd *scmd, *chan_scmd, *next; |
3eef6257 | 1347 | LIST_HEAD(check_list); |
1da177e4 LT |
1348 | unsigned int channel; |
1349 | int rtn; | |
1350 | ||
1351 | /* | |
1352 | * we really want to loop over the various channels, and do this on | |
1353 | * a channel by channel basis. we should also check to see if any | |
1354 | * of the failed commands are on soft_reset devices, and if so, skip | |
0bf8c869 | 1355 | * the reset. |
1da177e4 LT |
1356 | */ |
1357 | ||
1358 | for (channel = 0; channel <= shost->max_channel; channel++) { | |
1359 | chan_scmd = NULL; | |
1360 | list_for_each_entry(scmd, work_q, eh_entry) { | |
422c0d61 | 1361 | if (channel == scmd_channel(scmd)) { |
1da177e4 LT |
1362 | chan_scmd = scmd; |
1363 | break; | |
1364 | /* | |
1365 | * FIXME add back in some support for | |
1366 | * soft_reset devices. | |
1367 | */ | |
1368 | } | |
1369 | } | |
1370 | ||
1371 | if (!chan_scmd) | |
1372 | continue; | |
1373 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BRST chan:" | |
1374 | " %d\n", current->comm, | |
1375 | channel)); | |
1376 | rtn = scsi_try_bus_reset(chan_scmd); | |
2f2eb587 | 1377 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
937abeaa | 1378 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3eef6257 DJ |
1379 | if (channel == scmd_channel(scmd)) { |
1380 | if (rtn == FAST_IO_FAIL) | |
1da177e4 LT |
1381 | scsi_eh_finish_cmd(scmd, |
1382 | done_q); | |
3eef6257 DJ |
1383 | else |
1384 | list_move_tail(&scmd->eh_entry, | |
1385 | &check_list); | |
1386 | } | |
1da177e4 LT |
1387 | } |
1388 | } else { | |
1389 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BRST" | |
1390 | " failed chan: %d\n", | |
1391 | current->comm, | |
1392 | channel)); | |
1393 | } | |
1394 | } | |
3eef6257 | 1395 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4 LT |
1396 | } |
1397 | ||
1398 | /** | |
0bf8c869 | 1399 | * scsi_eh_host_reset - send a host reset |
1da177e4 LT |
1400 | * @work_q: list_head for processed commands. |
1401 | * @done_q: list_head for processed commands. | |
dc8875e1 | 1402 | */ |
1da177e4 LT |
1403 | static int scsi_eh_host_reset(struct list_head *work_q, |
1404 | struct list_head *done_q) | |
1405 | { | |
937abeaa | 1406 | struct scsi_cmnd *scmd, *next; |
3eef6257 | 1407 | LIST_HEAD(check_list); |
1da177e4 | 1408 | int rtn; |
1da177e4 LT |
1409 | |
1410 | if (!list_empty(work_q)) { | |
1411 | scmd = list_entry(work_q->next, | |
1412 | struct scsi_cmnd, eh_entry); | |
1413 | ||
1414 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending HRST\n" | |
1415 | , current->comm)); | |
1416 | ||
1417 | rtn = scsi_try_host_reset(scmd); | |
3eef6257 DJ |
1418 | if (rtn == SUCCESS) { |
1419 | list_splice_init(work_q, &check_list); | |
1420 | } else if (rtn == FAST_IO_FAIL) { | |
937abeaa | 1421 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1da177e4 LT |
1422 | scsi_eh_finish_cmd(scmd, done_q); |
1423 | } | |
1424 | } else { | |
1425 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: HRST" | |
1426 | " failed\n", | |
1427 | current->comm)); | |
1428 | } | |
1429 | } | |
3eef6257 | 1430 | return scsi_eh_test_devices(&check_list, work_q, done_q, 1); |
1da177e4 LT |
1431 | } |
1432 | ||
1433 | /** | |
1434 | * scsi_eh_offline_sdevs - offline scsi devices that fail to recover | |
1435 | * @work_q: list_head for processed commands. | |
1436 | * @done_q: list_head for processed commands. | |
dc8875e1 | 1437 | */ |
1da177e4 LT |
1438 | static void scsi_eh_offline_sdevs(struct list_head *work_q, |
1439 | struct list_head *done_q) | |
1440 | { | |
937abeaa | 1441 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1442 | |
937abeaa | 1443 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
31765d7d MW |
1444 | sdev_printk(KERN_INFO, scmd->device, "Device offlined - " |
1445 | "not ready after error recovery\n"); | |
1da177e4 | 1446 | scsi_device_set_state(scmd->device, SDEV_OFFLINE); |
3111b0d1 | 1447 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) { |
1da177e4 LT |
1448 | /* |
1449 | * FIXME: Handle lost cmds. | |
1450 | */ | |
1451 | } | |
1452 | scsi_eh_finish_cmd(scmd, done_q); | |
1453 | } | |
1454 | return; | |
1455 | } | |
1456 | ||
4a27446f MC |
1457 | /** |
1458 | * scsi_noretry_cmd - determinte if command should be failed fast | |
1459 | * @scmd: SCSI cmd to examine. | |
1460 | */ | |
1461 | int scsi_noretry_cmd(struct scsi_cmnd *scmd) | |
1462 | { | |
1463 | switch (host_byte(scmd->result)) { | |
1464 | case DID_OK: | |
1465 | break; | |
1466 | case DID_BUS_BUSY: | |
33659ebb | 1467 | return (scmd->request->cmd_flags & REQ_FAILFAST_TRANSPORT); |
4a27446f | 1468 | case DID_PARITY: |
33659ebb | 1469 | return (scmd->request->cmd_flags & REQ_FAILFAST_DEV); |
4a27446f MC |
1470 | case DID_ERROR: |
1471 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1472 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1473 | return 0; | |
1474 | /* fall through */ | |
1475 | case DID_SOFT_ERROR: | |
33659ebb | 1476 | return (scmd->request->cmd_flags & REQ_FAILFAST_DRIVER); |
4a27446f MC |
1477 | } |
1478 | ||
1479 | switch (status_byte(scmd->result)) { | |
1480 | case CHECK_CONDITION: | |
1481 | /* | |
1482 | * assume caller has checked sense and determinted | |
1483 | * the check condition was retryable. | |
1484 | */ | |
e96f6abe FT |
1485 | if (scmd->request->cmd_flags & REQ_FAILFAST_DEV || |
1486 | scmd->request->cmd_type == REQ_TYPE_BLOCK_PC) | |
1487 | return 1; | |
4a27446f MC |
1488 | } |
1489 | ||
1490 | return 0; | |
1491 | } | |
1492 | ||
1da177e4 LT |
1493 | /** |
1494 | * scsi_decide_disposition - Disposition a cmd on return from LLD. | |
1495 | * @scmd: SCSI cmd to examine. | |
1496 | * | |
1497 | * Notes: | |
1498 | * This is *only* called when we are examining the status after sending | |
1499 | * out the actual data command. any commands that are queued for error | |
1500 | * recovery (e.g. test_unit_ready) do *not* come through here. | |
1501 | * | |
1502 | * When this routine returns failed, it means the error handler thread | |
1503 | * is woken. In cases where the error code indicates an error that | |
1504 | * doesn't require the error handler read (i.e. we don't need to | |
1505 | * abort/reset), this function should return SUCCESS. | |
dc8875e1 | 1506 | */ |
1da177e4 LT |
1507 | int scsi_decide_disposition(struct scsi_cmnd *scmd) |
1508 | { | |
1509 | int rtn; | |
1510 | ||
1511 | /* | |
1512 | * if the device is offline, then we clearly just pass the result back | |
1513 | * up to the top level. | |
1514 | */ | |
1515 | if (!scsi_device_online(scmd->device)) { | |
1516 | SCSI_LOG_ERROR_RECOVERY(5, printk("%s: device offline - report" | |
1517 | " as SUCCESS\n", | |
cadbd4a5 | 1518 | __func__)); |
1da177e4 LT |
1519 | return SUCCESS; |
1520 | } | |
1521 | ||
1522 | /* | |
1523 | * first check the host byte, to see if there is anything in there | |
1524 | * that would indicate what we need to do. | |
1525 | */ | |
1526 | switch (host_byte(scmd->result)) { | |
1527 | case DID_PASSTHROUGH: | |
1528 | /* | |
1529 | * no matter what, pass this through to the upper layer. | |
1530 | * nuke this special code so that it looks like we are saying | |
1531 | * did_ok. | |
1532 | */ | |
1533 | scmd->result &= 0xff00ffff; | |
1534 | return SUCCESS; | |
1535 | case DID_OK: | |
1536 | /* | |
1537 | * looks good. drop through, and check the next byte. | |
1538 | */ | |
1539 | break; | |
1540 | case DID_NO_CONNECT: | |
1541 | case DID_BAD_TARGET: | |
1542 | case DID_ABORT: | |
1543 | /* | |
1544 | * note - this means that we just report the status back | |
1545 | * to the top level driver, not that we actually think | |
1546 | * that it indicates SUCCESS. | |
1547 | */ | |
1548 | return SUCCESS; | |
1549 | /* | |
1550 | * when the low level driver returns did_soft_error, | |
0bf8c869 | 1551 | * it is responsible for keeping an internal retry counter |
1da177e4 LT |
1552 | * in order to avoid endless loops (db) |
1553 | * | |
1554 | * actually this is a bug in this function here. we should | |
1555 | * be mindful of the maximum number of retries specified | |
1556 | * and not get stuck in a loop. | |
1557 | */ | |
1558 | case DID_SOFT_ERROR: | |
1559 | goto maybe_retry; | |
1560 | case DID_IMM_RETRY: | |
1561 | return NEEDS_RETRY; | |
1562 | ||
bf341919 | 1563 | case DID_REQUEUE: |
1564 | return ADD_TO_MLQUEUE; | |
a4dfaa6f MC |
1565 | case DID_TRANSPORT_DISRUPTED: |
1566 | /* | |
1567 | * LLD/transport was disrupted during processing of the IO. | |
1568 | * The transport class is now blocked/blocking, | |
1569 | * and the transport will decide what to do with the IO | |
939c2288 MC |
1570 | * based on its timers and recovery capablilities if |
1571 | * there are enough retries. | |
a4dfaa6f | 1572 | */ |
939c2288 | 1573 | goto maybe_retry; |
a4dfaa6f MC |
1574 | case DID_TRANSPORT_FAILFAST: |
1575 | /* | |
1576 | * The transport decided to failfast the IO (most likely | |
1577 | * the fast io fail tmo fired), so send IO directly upwards. | |
1578 | */ | |
1579 | return SUCCESS; | |
1da177e4 LT |
1580 | case DID_ERROR: |
1581 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1582 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1583 | /* | |
1584 | * execute reservation conflict processing code | |
1585 | * lower down | |
1586 | */ | |
1587 | break; | |
1588 | /* fallthrough */ | |
1da177e4 LT |
1589 | case DID_BUS_BUSY: |
1590 | case DID_PARITY: | |
1591 | goto maybe_retry; | |
1592 | case DID_TIME_OUT: | |
1593 | /* | |
1594 | * when we scan the bus, we get timeout messages for | |
1595 | * these commands if there is no device available. | |
1596 | * other hosts report did_no_connect for the same thing. | |
1597 | */ | |
1598 | if ((scmd->cmnd[0] == TEST_UNIT_READY || | |
1599 | scmd->cmnd[0] == INQUIRY)) { | |
1600 | return SUCCESS; | |
1601 | } else { | |
1602 | return FAILED; | |
1603 | } | |
1604 | case DID_RESET: | |
1605 | return SUCCESS; | |
1606 | default: | |
1607 | return FAILED; | |
1608 | } | |
1609 | ||
1610 | /* | |
1611 | * next, check the message byte. | |
1612 | */ | |
1613 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
1614 | return FAILED; | |
1615 | ||
1616 | /* | |
1617 | * check the status byte to see if this indicates anything special. | |
1618 | */ | |
1619 | switch (status_byte(scmd->result)) { | |
1620 | case QUEUE_FULL: | |
42a6a918 | 1621 | scsi_handle_queue_full(scmd->device); |
1da177e4 LT |
1622 | /* |
1623 | * the case of trying to send too many commands to a | |
1624 | * tagged queueing device. | |
1625 | */ | |
1626 | case BUSY: | |
1627 | /* | |
1628 | * device can't talk to us at the moment. Should only | |
1629 | * occur (SAM-3) when the task queue is empty, so will cause | |
1630 | * the empty queue handling to trigger a stall in the | |
1631 | * device. | |
1632 | */ | |
1633 | return ADD_TO_MLQUEUE; | |
1634 | case GOOD: | |
279afdfe EM |
1635 | if (scmd->cmnd[0] == REPORT_LUNS) |
1636 | scmd->device->sdev_target->expecting_lun_change = 0; | |
4a84067d | 1637 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 | 1638 | case COMMAND_TERMINATED: |
1da177e4 | 1639 | return SUCCESS; |
a9b589d9 VB |
1640 | case TASK_ABORTED: |
1641 | goto maybe_retry; | |
1da177e4 LT |
1642 | case CHECK_CONDITION: |
1643 | rtn = scsi_check_sense(scmd); | |
1644 | if (rtn == NEEDS_RETRY) | |
1645 | goto maybe_retry; | |
1646 | /* if rtn == FAILED, we have no sense information; | |
1647 | * returning FAILED will wake the error handler thread | |
1648 | * to collect the sense and redo the decide | |
1649 | * disposition */ | |
1650 | return rtn; | |
1651 | case CONDITION_GOOD: | |
1652 | case INTERMEDIATE_GOOD: | |
1653 | case INTERMEDIATE_C_GOOD: | |
1654 | case ACA_ACTIVE: | |
1655 | /* | |
1656 | * who knows? FIXME(eric) | |
1657 | */ | |
1658 | return SUCCESS; | |
1659 | ||
1660 | case RESERVATION_CONFLICT: | |
9ccfc756 JB |
1661 | sdev_printk(KERN_INFO, scmd->device, |
1662 | "reservation conflict\n"); | |
2082ebc4 | 1663 | set_host_byte(scmd, DID_NEXUS_FAILURE); |
1da177e4 LT |
1664 | return SUCCESS; /* causes immediate i/o error */ |
1665 | default: | |
1666 | return FAILED; | |
1667 | } | |
1668 | return FAILED; | |
1669 | ||
1670 | maybe_retry: | |
1671 | ||
1672 | /* we requeue for retry because the error was retryable, and | |
1673 | * the request was not marked fast fail. Note that above, | |
1674 | * even if the request is marked fast fail, we still requeue | |
1675 | * for queue congestion conditions (QUEUE_FULL or BUSY) */ | |
8884efab | 1676 | if ((++scmd->retries) <= scmd->allowed |
4a27446f | 1677 | && !scsi_noretry_cmd(scmd)) { |
1da177e4 LT |
1678 | return NEEDS_RETRY; |
1679 | } else { | |
1680 | /* | |
1681 | * no more retries - report this one back to upper level. | |
1682 | */ | |
1683 | return SUCCESS; | |
1684 | } | |
1685 | } | |
1686 | ||
f078727b FT |
1687 | static void eh_lock_door_done(struct request *req, int uptodate) |
1688 | { | |
1689 | __blk_put_request(req->q, req); | |
1690 | } | |
1691 | ||
1da177e4 LT |
1692 | /** |
1693 | * scsi_eh_lock_door - Prevent medium removal for the specified device | |
1694 | * @sdev: SCSI device to prevent medium removal | |
1695 | * | |
1696 | * Locking: | |
91bc31fb | 1697 | * We must be called from process context. |
1da177e4 LT |
1698 | * |
1699 | * Notes: | |
1700 | * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the | |
1701 | * head of the devices request queue, and continue. | |
dc8875e1 | 1702 | */ |
1da177e4 LT |
1703 | static void scsi_eh_lock_door(struct scsi_device *sdev) |
1704 | { | |
f078727b | 1705 | struct request *req; |
1da177e4 | 1706 | |
91bc31fb JB |
1707 | /* |
1708 | * blk_get_request with GFP_KERNEL (__GFP_WAIT) sleeps until a | |
1709 | * request becomes available | |
1710 | */ | |
f078727b | 1711 | req = blk_get_request(sdev->request_queue, READ, GFP_KERNEL); |
1da177e4 | 1712 | |
f078727b FT |
1713 | req->cmd[0] = ALLOW_MEDIUM_REMOVAL; |
1714 | req->cmd[1] = 0; | |
1715 | req->cmd[2] = 0; | |
1716 | req->cmd[3] = 0; | |
1717 | req->cmd[4] = SCSI_REMOVAL_PREVENT; | |
1718 | req->cmd[5] = 0; | |
1da177e4 | 1719 | |
f078727b FT |
1720 | req->cmd_len = COMMAND_SIZE(req->cmd[0]); |
1721 | ||
1722 | req->cmd_type = REQ_TYPE_BLOCK_PC; | |
1723 | req->cmd_flags |= REQ_QUIET; | |
1724 | req->timeout = 10 * HZ; | |
1725 | req->retries = 5; | |
1726 | ||
1727 | blk_execute_rq_nowait(req->q, NULL, req, 1, eh_lock_door_done); | |
1728 | } | |
1da177e4 LT |
1729 | |
1730 | /** | |
1731 | * scsi_restart_operations - restart io operations to the specified host. | |
1732 | * @shost: Host we are restarting. | |
1733 | * | |
1734 | * Notes: | |
1735 | * When we entered the error handler, we blocked all further i/o to | |
1736 | * this device. we need to 'reverse' this process. | |
dc8875e1 | 1737 | */ |
1da177e4 LT |
1738 | static void scsi_restart_operations(struct Scsi_Host *shost) |
1739 | { | |
1740 | struct scsi_device *sdev; | |
939647ee | 1741 | unsigned long flags; |
1da177e4 LT |
1742 | |
1743 | /* | |
1744 | * If the door was locked, we need to insert a door lock request | |
1745 | * onto the head of the SCSI request queue for the device. There | |
1746 | * is no point trying to lock the door of an off-line device. | |
1747 | */ | |
1748 | shost_for_each_device(sdev, shost) { | |
1749 | if (scsi_device_online(sdev) && sdev->locked) | |
1750 | scsi_eh_lock_door(sdev); | |
1751 | } | |
1752 | ||
1753 | /* | |
1754 | * next free up anything directly waiting upon the host. this | |
1755 | * will be requests for character device operations, and also for | |
1756 | * ioctls to queued block devices. | |
1757 | */ | |
1758 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: waking up host to restart\n", | |
cadbd4a5 | 1759 | __func__)); |
1da177e4 | 1760 | |
939647ee JB |
1761 | spin_lock_irqsave(shost->host_lock, flags); |
1762 | if (scsi_host_set_state(shost, SHOST_RUNNING)) | |
1763 | if (scsi_host_set_state(shost, SHOST_CANCEL)) | |
1764 | BUG_ON(scsi_host_set_state(shost, SHOST_DEL)); | |
1765 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
1766 | |
1767 | wake_up(&shost->host_wait); | |
1768 | ||
1769 | /* | |
1770 | * finally we need to re-initiate requests that may be pending. we will | |
1771 | * have had everything blocked while error handling is taking place, and | |
1772 | * now that error recovery is done, we will need to ensure that these | |
1773 | * requests are started. | |
1774 | */ | |
1775 | scsi_run_host_queues(shost); | |
57fc2e33 DW |
1776 | |
1777 | /* | |
1778 | * if eh is active and host_eh_scheduled is pending we need to re-run | |
1779 | * recovery. we do this check after scsi_run_host_queues() to allow | |
1780 | * everything pent up since the last eh run a chance to make forward | |
1781 | * progress before we sync again. Either we'll immediately re-run | |
1782 | * recovery or scsi_device_unbusy() will wake us again when these | |
1783 | * pending commands complete. | |
1784 | */ | |
1785 | spin_lock_irqsave(shost->host_lock, flags); | |
1786 | if (shost->host_eh_scheduled) | |
1787 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) | |
1788 | WARN_ON(scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)); | |
1789 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
1790 | } |
1791 | ||
1792 | /** | |
1793 | * scsi_eh_ready_devs - check device ready state and recover if not. | |
1794 | * @shost: host to be recovered. | |
eb44820c RL |
1795 | * @work_q: &list_head for pending commands. |
1796 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1797 | */ |
dca84e46 DW |
1798 | void scsi_eh_ready_devs(struct Scsi_Host *shost, |
1799 | struct list_head *work_q, | |
1800 | struct list_head *done_q) | |
1da177e4 LT |
1801 | { |
1802 | if (!scsi_eh_stu(shost, work_q, done_q)) | |
1803 | if (!scsi_eh_bus_device_reset(shost, work_q, done_q)) | |
30bd7df8 MC |
1804 | if (!scsi_eh_target_reset(shost, work_q, done_q)) |
1805 | if (!scsi_eh_bus_reset(shost, work_q, done_q)) | |
1806 | if (!scsi_eh_host_reset(work_q, done_q)) | |
1807 | scsi_eh_offline_sdevs(work_q, | |
1808 | done_q); | |
1da177e4 | 1809 | } |
dca84e46 | 1810 | EXPORT_SYMBOL_GPL(scsi_eh_ready_devs); |
1da177e4 LT |
1811 | |
1812 | /** | |
1813 | * scsi_eh_flush_done_q - finish processed commands or retry them. | |
1814 | * @done_q: list_head of processed commands. | |
dc8875e1 | 1815 | */ |
041c5fc3 | 1816 | void scsi_eh_flush_done_q(struct list_head *done_q) |
1da177e4 | 1817 | { |
937abeaa | 1818 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1819 | |
937abeaa CH |
1820 | list_for_each_entry_safe(scmd, next, done_q, eh_entry) { |
1821 | list_del_init(&scmd->eh_entry); | |
1da177e4 | 1822 | if (scsi_device_online(scmd->device) && |
4a27446f | 1823 | !scsi_noretry_cmd(scmd) && |
8884efab | 1824 | (++scmd->retries <= scmd->allowed)) { |
1da177e4 LT |
1825 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush" |
1826 | " retry cmd: %p\n", | |
1827 | current->comm, | |
1828 | scmd)); | |
1829 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); | |
1830 | } else { | |
793698ce PM |
1831 | /* |
1832 | * If just we got sense for the device (called | |
1833 | * scsi_eh_get_sense), scmd->result is already | |
1834 | * set, do not set DRIVER_TIMEOUT. | |
1835 | */ | |
1da177e4 LT |
1836 | if (!scmd->result) |
1837 | scmd->result |= (DRIVER_TIMEOUT << 24); | |
1838 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush finish" | |
1839 | " cmd: %p\n", | |
1840 | current->comm, scmd)); | |
1841 | scsi_finish_command(scmd); | |
1842 | } | |
1843 | } | |
1844 | } | |
041c5fc3 | 1845 | EXPORT_SYMBOL(scsi_eh_flush_done_q); |
1da177e4 LT |
1846 | |
1847 | /** | |
1848 | * scsi_unjam_host - Attempt to fix a host which has a cmd that failed. | |
1849 | * @shost: Host to unjam. | |
1850 | * | |
1851 | * Notes: | |
1852 | * When we come in here, we *know* that all commands on the bus have | |
1853 | * either completed, failed or timed out. we also know that no further | |
1854 | * commands are being sent to the host, so things are relatively quiet | |
1855 | * and we have freedom to fiddle with things as we wish. | |
1856 | * | |
1857 | * This is only the *default* implementation. it is possible for | |
1858 | * individual drivers to supply their own version of this function, and | |
1859 | * if the maintainer wishes to do this, it is strongly suggested that | |
1860 | * this function be taken as a template and modified. this function | |
1861 | * was designed to correctly handle problems for about 95% of the | |
1862 | * different cases out there, and it should always provide at least a | |
1863 | * reasonable amount of error recovery. | |
1864 | * | |
1865 | * Any command marked 'failed' or 'timeout' must eventually have | |
1866 | * scsi_finish_cmd() called for it. we do all of the retry stuff | |
1867 | * here, so when we restart the host after we return it should have an | |
1868 | * empty queue. | |
dc8875e1 | 1869 | */ |
1da177e4 LT |
1870 | static void scsi_unjam_host(struct Scsi_Host *shost) |
1871 | { | |
1872 | unsigned long flags; | |
1873 | LIST_HEAD(eh_work_q); | |
1874 | LIST_HEAD(eh_done_q); | |
1875 | ||
1876 | spin_lock_irqsave(shost->host_lock, flags); | |
1877 | list_splice_init(&shost->eh_cmd_q, &eh_work_q); | |
1878 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1879 | ||
1880 | SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost, &eh_work_q)); | |
1881 | ||
1882 | if (!scsi_eh_get_sense(&eh_work_q, &eh_done_q)) | |
1883 | if (!scsi_eh_abort_cmds(&eh_work_q, &eh_done_q)) | |
1884 | scsi_eh_ready_devs(shost, &eh_work_q, &eh_done_q); | |
1885 | ||
1886 | scsi_eh_flush_done_q(&eh_done_q); | |
1887 | } | |
1888 | ||
1889 | /** | |
ad42eb1b | 1890 | * scsi_error_handler - SCSI error handler thread |
1da177e4 LT |
1891 | * @data: Host for which we are running. |
1892 | * | |
1893 | * Notes: | |
ad42eb1b CH |
1894 | * This is the main error handling loop. This is run as a kernel thread |
1895 | * for every SCSI host and handles all error handling activity. | |
dc8875e1 | 1896 | */ |
1da177e4 LT |
1897 | int scsi_error_handler(void *data) |
1898 | { | |
ad42eb1b | 1899 | struct Scsi_Host *shost = data; |
1da177e4 | 1900 | |
1da177e4 | 1901 | /* |
ad42eb1b CH |
1902 | * We use TASK_INTERRUPTIBLE so that the thread is not |
1903 | * counted against the load average as a running process. | |
1904 | * We never actually get interrupted because kthread_run | |
c03264a7 | 1905 | * disables signal delivery for the created thread. |
1da177e4 | 1906 | */ |
3ed7a470 | 1907 | while (!kthread_should_stop()) { |
b9d5c6b7 | 1908 | set_current_state(TASK_INTERRUPTIBLE); |
ee7863bc | 1909 | if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) || |
3ed7a470 | 1910 | shost->host_failed != shost->host_busy) { |
ad42eb1b CH |
1911 | SCSI_LOG_ERROR_RECOVERY(1, |
1912 | printk("Error handler scsi_eh_%d sleeping\n", | |
1913 | shost->host_no)); | |
3ed7a470 | 1914 | schedule(); |
3ed7a470 JB |
1915 | continue; |
1916 | } | |
1da177e4 | 1917 | |
3ed7a470 | 1918 | __set_current_state(TASK_RUNNING); |
ad42eb1b CH |
1919 | SCSI_LOG_ERROR_RECOVERY(1, |
1920 | printk("Error handler scsi_eh_%d waking up\n", | |
1921 | shost->host_no)); | |
1da177e4 | 1922 | |
1da177e4 LT |
1923 | /* |
1924 | * We have a host that is failing for some reason. Figure out | |
1925 | * what we need to do to get it up and online again (if we can). | |
1926 | * If we fail, we end up taking the thing offline. | |
1927 | */ | |
ae0751ff | 1928 | if (!shost->eh_noresume && scsi_autopm_get_host(shost) != 0) { |
bc4f2401 AS |
1929 | SCSI_LOG_ERROR_RECOVERY(1, |
1930 | printk(KERN_ERR "Error handler scsi_eh_%d " | |
1931 | "unable to autoresume\n", | |
1932 | shost->host_no)); | |
1933 | continue; | |
1934 | } | |
1935 | ||
9227c33d CH |
1936 | if (shost->transportt->eh_strategy_handler) |
1937 | shost->transportt->eh_strategy_handler(shost); | |
1da177e4 LT |
1938 | else |
1939 | scsi_unjam_host(shost); | |
1940 | ||
1da177e4 LT |
1941 | /* |
1942 | * Note - if the above fails completely, the action is to take | |
1943 | * individual devices offline and flush the queue of any | |
1944 | * outstanding requests that may have been pending. When we | |
1945 | * restart, we restart any I/O to any other devices on the bus | |
1946 | * which are still online. | |
1947 | */ | |
1948 | scsi_restart_operations(shost); | |
ae0751ff LM |
1949 | if (!shost->eh_noresume) |
1950 | scsi_autopm_put_host(shost); | |
1da177e4 | 1951 | } |
461a0ffb SR |
1952 | __set_current_state(TASK_RUNNING); |
1953 | ||
ad42eb1b CH |
1954 | SCSI_LOG_ERROR_RECOVERY(1, |
1955 | printk("Error handler scsi_eh_%d exiting\n", shost->host_no)); | |
3ed7a470 | 1956 | shost->ehandler = NULL; |
1da177e4 LT |
1957 | return 0; |
1958 | } | |
1959 | ||
1960 | /* | |
1961 | * Function: scsi_report_bus_reset() | |
1962 | * | |
1963 | * Purpose: Utility function used by low-level drivers to report that | |
1964 | * they have observed a bus reset on the bus being handled. | |
1965 | * | |
1966 | * Arguments: shost - Host in question | |
1967 | * channel - channel on which reset was observed. | |
1968 | * | |
1969 | * Returns: Nothing | |
1970 | * | |
1971 | * Lock status: Host lock must be held. | |
1972 | * | |
1973 | * Notes: This only needs to be called if the reset is one which | |
1974 | * originates from an unknown location. Resets originated | |
1975 | * by the mid-level itself don't need to call this, but there | |
1976 | * should be no harm. | |
1977 | * | |
1978 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
1979 | * is properly treated. | |
1980 | */ | |
1981 | void scsi_report_bus_reset(struct Scsi_Host *shost, int channel) | |
1982 | { | |
1983 | struct scsi_device *sdev; | |
1984 | ||
1985 | __shost_for_each_device(sdev, shost) { | |
30bd7df8 MC |
1986 | if (channel == sdev_channel(sdev)) |
1987 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
1988 | } |
1989 | } | |
1990 | EXPORT_SYMBOL(scsi_report_bus_reset); | |
1991 | ||
1992 | /* | |
1993 | * Function: scsi_report_device_reset() | |
1994 | * | |
1995 | * Purpose: Utility function used by low-level drivers to report that | |
1996 | * they have observed a device reset on the device being handled. | |
1997 | * | |
1998 | * Arguments: shost - Host in question | |
1999 | * channel - channel on which reset was observed | |
2000 | * target - target on which reset was observed | |
2001 | * | |
2002 | * Returns: Nothing | |
2003 | * | |
2004 | * Lock status: Host lock must be held | |
2005 | * | |
2006 | * Notes: This only needs to be called if the reset is one which | |
2007 | * originates from an unknown location. Resets originated | |
2008 | * by the mid-level itself don't need to call this, but there | |
2009 | * should be no harm. | |
2010 | * | |
2011 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
2012 | * is properly treated. | |
2013 | */ | |
2014 | void scsi_report_device_reset(struct Scsi_Host *shost, int channel, int target) | |
2015 | { | |
2016 | struct scsi_device *sdev; | |
2017 | ||
2018 | __shost_for_each_device(sdev, shost) { | |
422c0d61 | 2019 | if (channel == sdev_channel(sdev) && |
30bd7df8 MC |
2020 | target == sdev_id(sdev)) |
2021 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
2022 | } |
2023 | } | |
2024 | EXPORT_SYMBOL(scsi_report_device_reset); | |
2025 | ||
2026 | static void | |
2027 | scsi_reset_provider_done_command(struct scsi_cmnd *scmd) | |
2028 | { | |
2029 | } | |
2030 | ||
2031 | /* | |
2032 | * Function: scsi_reset_provider | |
2033 | * | |
2034 | * Purpose: Send requested reset to a bus or device at any phase. | |
2035 | * | |
2036 | * Arguments: device - device to send reset to | |
2037 | * flag - reset type (see scsi.h) | |
2038 | * | |
2039 | * Returns: SUCCESS/FAILURE. | |
2040 | * | |
2041 | * Notes: This is used by the SCSI Generic driver to provide | |
2042 | * Bus/Device reset capability. | |
2043 | */ | |
2044 | int | |
2045 | scsi_reset_provider(struct scsi_device *dev, int flag) | |
2046 | { | |
bc4f2401 | 2047 | struct scsi_cmnd *scmd; |
d7a1bb0a | 2048 | struct Scsi_Host *shost = dev->host; |
1da177e4 | 2049 | struct request req; |
d7a1bb0a | 2050 | unsigned long flags; |
1da177e4 LT |
2051 | int rtn; |
2052 | ||
bc4f2401 AS |
2053 | if (scsi_autopm_get_host(shost) < 0) |
2054 | return FAILED; | |
2055 | ||
2056 | scmd = scsi_get_command(dev, GFP_KERNEL); | |
4f54eec8 | 2057 | blk_rq_init(NULL, &req); |
1da177e4 | 2058 | scmd->request = &req; |
b4edcbca | 2059 | |
64a87b24 BH |
2060 | scmd->cmnd = req.cmd; |
2061 | ||
1da177e4 | 2062 | scmd->scsi_done = scsi_reset_provider_done_command; |
30b0c37b | 2063 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
1da177e4 LT |
2064 | |
2065 | scmd->cmd_len = 0; | |
2066 | ||
2067 | scmd->sc_data_direction = DMA_BIDIRECTIONAL; | |
1da177e4 | 2068 | |
d7a1bb0a JS |
2069 | spin_lock_irqsave(shost->host_lock, flags); |
2070 | shost->tmf_in_progress = 1; | |
2071 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2072 | ||
1da177e4 LT |
2073 | switch (flag) { |
2074 | case SCSI_TRY_RESET_DEVICE: | |
2075 | rtn = scsi_try_bus_device_reset(scmd); | |
2076 | if (rtn == SUCCESS) | |
2077 | break; | |
2078 | /* FALLTHROUGH */ | |
30bd7df8 MC |
2079 | case SCSI_TRY_RESET_TARGET: |
2080 | rtn = scsi_try_target_reset(scmd); | |
2081 | if (rtn == SUCCESS) | |
2082 | break; | |
2083 | /* FALLTHROUGH */ | |
1da177e4 LT |
2084 | case SCSI_TRY_RESET_BUS: |
2085 | rtn = scsi_try_bus_reset(scmd); | |
2086 | if (rtn == SUCCESS) | |
2087 | break; | |
2088 | /* FALLTHROUGH */ | |
2089 | case SCSI_TRY_RESET_HOST: | |
2090 | rtn = scsi_try_host_reset(scmd); | |
2091 | break; | |
2092 | default: | |
2093 | rtn = FAILED; | |
2094 | } | |
2095 | ||
d7a1bb0a JS |
2096 | spin_lock_irqsave(shost->host_lock, flags); |
2097 | shost->tmf_in_progress = 0; | |
2098 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2099 | ||
2100 | /* | |
2101 | * be sure to wake up anyone who was sleeping or had their queue | |
2102 | * suspended while we performed the TMF. | |
2103 | */ | |
2104 | SCSI_LOG_ERROR_RECOVERY(3, | |
2105 | printk("%s: waking up host to restart after TMF\n", | |
cadbd4a5 | 2106 | __func__)); |
d7a1bb0a JS |
2107 | |
2108 | wake_up(&shost->host_wait); | |
2109 | ||
2110 | scsi_run_host_queues(shost); | |
2111 | ||
1da177e4 | 2112 | scsi_next_command(scmd); |
bc4f2401 | 2113 | scsi_autopm_put_host(shost); |
1da177e4 LT |
2114 | return rtn; |
2115 | } | |
2116 | EXPORT_SYMBOL(scsi_reset_provider); | |
2117 | ||
2118 | /** | |
2119 | * scsi_normalize_sense - normalize main elements from either fixed or | |
2120 | * descriptor sense data format into a common format. | |
2121 | * | |
2122 | * @sense_buffer: byte array containing sense data returned by device | |
2123 | * @sb_len: number of valid bytes in sense_buffer | |
2124 | * @sshdr: pointer to instance of structure that common | |
2125 | * elements are written to. | |
2126 | * | |
2127 | * Notes: | |
2128 | * The "main elements" from sense data are: response_code, sense_key, | |
2129 | * asc, ascq and additional_length (only for descriptor format). | |
2130 | * | |
2131 | * Typically this function can be called after a device has | |
2132 | * responded to a SCSI command with the CHECK_CONDITION status. | |
2133 | * | |
2134 | * Return value: | |
2135 | * 1 if valid sense data information found, else 0; | |
dc8875e1 | 2136 | */ |
1da177e4 LT |
2137 | int scsi_normalize_sense(const u8 *sense_buffer, int sb_len, |
2138 | struct scsi_sense_hdr *sshdr) | |
2139 | { | |
33aa687d | 2140 | if (!sense_buffer || !sb_len) |
1da177e4 LT |
2141 | return 0; |
2142 | ||
2143 | memset(sshdr, 0, sizeof(struct scsi_sense_hdr)); | |
2144 | ||
2145 | sshdr->response_code = (sense_buffer[0] & 0x7f); | |
33aa687d JB |
2146 | |
2147 | if (!scsi_sense_valid(sshdr)) | |
2148 | return 0; | |
2149 | ||
1da177e4 LT |
2150 | if (sshdr->response_code >= 0x72) { |
2151 | /* | |
2152 | * descriptor format | |
2153 | */ | |
2154 | if (sb_len > 1) | |
2155 | sshdr->sense_key = (sense_buffer[1] & 0xf); | |
2156 | if (sb_len > 2) | |
2157 | sshdr->asc = sense_buffer[2]; | |
2158 | if (sb_len > 3) | |
2159 | sshdr->ascq = sense_buffer[3]; | |
2160 | if (sb_len > 7) | |
2161 | sshdr->additional_length = sense_buffer[7]; | |
2162 | } else { | |
0bf8c869 | 2163 | /* |
1da177e4 LT |
2164 | * fixed format |
2165 | */ | |
2166 | if (sb_len > 2) | |
2167 | sshdr->sense_key = (sense_buffer[2] & 0xf); | |
2168 | if (sb_len > 7) { | |
2169 | sb_len = (sb_len < (sense_buffer[7] + 8)) ? | |
2170 | sb_len : (sense_buffer[7] + 8); | |
2171 | if (sb_len > 12) | |
2172 | sshdr->asc = sense_buffer[12]; | |
2173 | if (sb_len > 13) | |
2174 | sshdr->ascq = sense_buffer[13]; | |
2175 | } | |
2176 | } | |
2177 | ||
2178 | return 1; | |
2179 | } | |
2180 | EXPORT_SYMBOL(scsi_normalize_sense); | |
2181 | ||
1da177e4 LT |
2182 | int scsi_command_normalize_sense(struct scsi_cmnd *cmd, |
2183 | struct scsi_sense_hdr *sshdr) | |
2184 | { | |
2185 | return scsi_normalize_sense(cmd->sense_buffer, | |
b80ca4f7 | 2186 | SCSI_SENSE_BUFFERSIZE, sshdr); |
1da177e4 LT |
2187 | } |
2188 | EXPORT_SYMBOL(scsi_command_normalize_sense); | |
2189 | ||
2190 | /** | |
eb44820c | 2191 | * scsi_sense_desc_find - search for a given descriptor type in descriptor sense data format. |
1da177e4 LT |
2192 | * @sense_buffer: byte array of descriptor format sense data |
2193 | * @sb_len: number of valid bytes in sense_buffer | |
2194 | * @desc_type: value of descriptor type to find | |
2195 | * (e.g. 0 -> information) | |
2196 | * | |
2197 | * Notes: | |
2198 | * only valid when sense data is in descriptor format | |
2199 | * | |
2200 | * Return value: | |
2201 | * pointer to start of (first) descriptor if found else NULL | |
dc8875e1 | 2202 | */ |
1da177e4 LT |
2203 | const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len, |
2204 | int desc_type) | |
2205 | { | |
2206 | int add_sen_len, add_len, desc_len, k; | |
2207 | const u8 * descp; | |
2208 | ||
2209 | if ((sb_len < 8) || (0 == (add_sen_len = sense_buffer[7]))) | |
2210 | return NULL; | |
2211 | if ((sense_buffer[0] < 0x72) || (sense_buffer[0] > 0x73)) | |
2212 | return NULL; | |
2213 | add_sen_len = (add_sen_len < (sb_len - 8)) ? | |
2214 | add_sen_len : (sb_len - 8); | |
2215 | descp = &sense_buffer[8]; | |
2216 | for (desc_len = 0, k = 0; k < add_sen_len; k += desc_len) { | |
2217 | descp += desc_len; | |
2218 | add_len = (k < (add_sen_len - 1)) ? descp[1]: -1; | |
2219 | desc_len = add_len + 2; | |
2220 | if (descp[0] == desc_type) | |
2221 | return descp; | |
2222 | if (add_len < 0) // short descriptor ?? | |
2223 | break; | |
2224 | } | |
2225 | return NULL; | |
2226 | } | |
2227 | EXPORT_SYMBOL(scsi_sense_desc_find); | |
2228 | ||
2229 | /** | |
eb44820c | 2230 | * scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor format) |
1da177e4 LT |
2231 | * @sense_buffer: byte array of sense data |
2232 | * @sb_len: number of valid bytes in sense_buffer | |
2233 | * @info_out: pointer to 64 integer where 8 or 4 byte information | |
2234 | * field will be placed if found. | |
2235 | * | |
2236 | * Return value: | |
2237 | * 1 if information field found, 0 if not found. | |
dc8875e1 | 2238 | */ |
1da177e4 LT |
2239 | int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len, |
2240 | u64 * info_out) | |
2241 | { | |
2242 | int j; | |
2243 | const u8 * ucp; | |
2244 | u64 ull; | |
2245 | ||
2246 | if (sb_len < 7) | |
2247 | return 0; | |
2248 | switch (sense_buffer[0] & 0x7f) { | |
2249 | case 0x70: | |
2250 | case 0x71: | |
2251 | if (sense_buffer[0] & 0x80) { | |
2252 | *info_out = (sense_buffer[3] << 24) + | |
2253 | (sense_buffer[4] << 16) + | |
2254 | (sense_buffer[5] << 8) + sense_buffer[6]; | |
2255 | return 1; | |
2256 | } else | |
2257 | return 0; | |
2258 | case 0x72: | |
2259 | case 0x73: | |
2260 | ucp = scsi_sense_desc_find(sense_buffer, sb_len, | |
2261 | 0 /* info desc */); | |
2262 | if (ucp && (0xa == ucp[1])) { | |
2263 | ull = 0; | |
2264 | for (j = 0; j < 8; ++j) { | |
2265 | if (j > 0) | |
2266 | ull <<= 8; | |
2267 | ull |= ucp[4 + j]; | |
2268 | } | |
2269 | *info_out = ull; | |
2270 | return 1; | |
2271 | } else | |
2272 | return 0; | |
2273 | default: | |
2274 | return 0; | |
2275 | } | |
2276 | } | |
2277 | EXPORT_SYMBOL(scsi_get_sense_info_fld); | |
3bc6a261 FT |
2278 | |
2279 | /** | |
2280 | * scsi_build_sense_buffer - build sense data in a buffer | |
2281 | * @desc: Sense format (non zero == descriptor format, | |
2282 | * 0 == fixed format) | |
2283 | * @buf: Where to build sense data | |
2284 | * @key: Sense key | |
2285 | * @asc: Additional sense code | |
2286 | * @ascq: Additional sense code qualifier | |
2287 | * | |
2288 | **/ | |
2289 | void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq) | |
2290 | { | |
2291 | if (desc) { | |
2292 | buf[0] = 0x72; /* descriptor, current */ | |
2293 | buf[1] = key; | |
2294 | buf[2] = asc; | |
2295 | buf[3] = ascq; | |
2296 | buf[7] = 0; | |
2297 | } else { | |
2298 | buf[0] = 0x70; /* fixed, current */ | |
2299 | buf[2] = key; | |
2300 | buf[7] = 0xa; | |
2301 | buf[12] = asc; | |
2302 | buf[13] = ascq; | |
2303 | } | |
2304 | } | |
2305 | EXPORT_SYMBOL(scsi_build_sense_buffer); |