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1da177e4 LT |
1 | /* |
2 | * scsi_error.c Copyright (C) 1997 Eric Youngdale | |
3 | * | |
4 | * SCSI error/timeout handling | |
5 | * Initial versions: Eric Youngdale. Based upon conversations with | |
0bf8c869 | 6 | * Leonard Zubkoff and David Miller at Linux Expo, |
1da177e4 LT |
7 | * ideas originating from all over the place. |
8 | * | |
9 | * Restructured scsi_unjam_host and associated functions. | |
10 | * September 04, 2002 Mike Anderson (andmike@us.ibm.com) | |
11 | * | |
12 | * Forward port of Russell King's (rmk@arm.linux.org.uk) changes and | |
0bf8c869 | 13 | * minor cleanups. |
1da177e4 LT |
14 | * September 30, 2002 Mike Anderson (andmike@us.ibm.com) |
15 | */ | |
16 | ||
17 | #include <linux/module.h> | |
18 | #include <linux/sched.h> | |
5a0e3ad6 | 19 | #include <linux/gfp.h> |
1da177e4 LT |
20 | #include <linux/timer.h> |
21 | #include <linux/string.h> | |
1da177e4 | 22 | #include <linux/kernel.h> |
83144186 | 23 | #include <linux/freezer.h> |
c5478def | 24 | #include <linux/kthread.h> |
1da177e4 LT |
25 | #include <linux/interrupt.h> |
26 | #include <linux/blkdev.h> | |
27 | #include <linux/delay.h> | |
fc73648a | 28 | #include <linux/jiffies.h> |
1da177e4 LT |
29 | |
30 | #include <scsi/scsi.h> | |
beb40487 | 31 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
32 | #include <scsi/scsi_dbg.h> |
33 | #include <scsi/scsi_device.h> | |
18a4d0a2 | 34 | #include <scsi/scsi_driver.h> |
1da177e4 | 35 | #include <scsi/scsi_eh.h> |
c829c394 | 36 | #include <scsi/scsi_transport.h> |
1da177e4 LT |
37 | #include <scsi/scsi_host.h> |
38 | #include <scsi/scsi_ioctl.h> | |
1da177e4 LT |
39 | |
40 | #include "scsi_priv.h" | |
41 | #include "scsi_logging.h" | |
79ee8304 | 42 | #include "scsi_transport_api.h" |
1da177e4 | 43 | |
bf816235 KT |
44 | #include <trace/events/scsi.h> |
45 | ||
14216561 JB |
46 | static void scsi_eh_done(struct scsi_cmnd *scmd); |
47 | ||
1da177e4 LT |
48 | /* |
49 | * These should *probably* be handled by the host itself. | |
50 | * Since it is allowed to sleep, it probably should. | |
51 | */ | |
52 | #define BUS_RESET_SETTLE_TIME (10) | |
53 | #define HOST_RESET_SETTLE_TIME (10) | |
54 | ||
3eef6257 DJ |
55 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd); |
56 | ||
1da177e4 LT |
57 | /* called with shost->host_lock held */ |
58 | void scsi_eh_wakeup(struct Scsi_Host *shost) | |
59 | { | |
60 | if (shost->host_busy == shost->host_failed) { | |
bf816235 | 61 | trace_scsi_eh_wakeup(shost); |
3ed7a470 | 62 | wake_up_process(shost->ehandler); |
1da177e4 LT |
63 | SCSI_LOG_ERROR_RECOVERY(5, |
64 | printk("Waking error handler thread\n")); | |
65 | } | |
66 | } | |
f8bbfc24 TH |
67 | |
68 | /** | |
69 | * scsi_schedule_eh - schedule EH for SCSI host | |
70 | * @shost: SCSI host to invoke error handling on. | |
71 | * | |
72 | * Schedule SCSI EH without scmd. | |
dc8875e1 | 73 | */ |
f8bbfc24 TH |
74 | void scsi_schedule_eh(struct Scsi_Host *shost) |
75 | { | |
76 | unsigned long flags; | |
77 | ||
78 | spin_lock_irqsave(shost->host_lock, flags); | |
79 | ||
80 | if (scsi_host_set_state(shost, SHOST_RECOVERY) == 0 || | |
81 | scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY) == 0) { | |
82 | shost->host_eh_scheduled++; | |
83 | scsi_eh_wakeup(shost); | |
84 | } | |
85 | ||
86 | spin_unlock_irqrestore(shost->host_lock, flags); | |
87 | } | |
88 | EXPORT_SYMBOL_GPL(scsi_schedule_eh); | |
1da177e4 LT |
89 | |
90 | /** | |
91 | * scsi_eh_scmd_add - add scsi cmd to error handling. | |
92 | * @scmd: scmd to run eh on. | |
93 | * @eh_flag: optional SCSI_EH flag. | |
94 | * | |
95 | * Return value: | |
96 | * 0 on failure. | |
dc8875e1 | 97 | */ |
1da177e4 LT |
98 | int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag) |
99 | { | |
100 | struct Scsi_Host *shost = scmd->device->host; | |
101 | unsigned long flags; | |
939647ee | 102 | int ret = 0; |
1da177e4 | 103 | |
3ed7a470 | 104 | if (!shost->ehandler) |
1da177e4 LT |
105 | return 0; |
106 | ||
107 | spin_lock_irqsave(shost->host_lock, flags); | |
939647ee JB |
108 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) |
109 | if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) | |
110 | goto out_unlock; | |
1da177e4 | 111 | |
939647ee | 112 | ret = 1; |
3111b0d1 | 113 | scmd->eh_eflags |= eh_flag; |
1da177e4 | 114 | list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q); |
1da177e4 LT |
115 | shost->host_failed++; |
116 | scsi_eh_wakeup(shost); | |
939647ee | 117 | out_unlock: |
1da177e4 | 118 | spin_unlock_irqrestore(shost->host_lock, flags); |
939647ee | 119 | return ret; |
1da177e4 LT |
120 | } |
121 | ||
1da177e4 LT |
122 | /** |
123 | * scsi_times_out - Timeout function for normal scsi commands. | |
242f9dcb | 124 | * @req: request that is timing out. |
1da177e4 LT |
125 | * |
126 | * Notes: | |
127 | * We do not need to lock this. There is the potential for a race | |
128 | * only in that the normal completion handling might run, but if the | |
129 | * normal completion function determines that the timer has already | |
130 | * fired, then it mustn't do anything. | |
dc8875e1 | 131 | */ |
242f9dcb | 132 | enum blk_eh_timer_return scsi_times_out(struct request *req) |
1da177e4 | 133 | { |
242f9dcb | 134 | struct scsi_cmnd *scmd = req->special; |
242f9dcb | 135 | enum blk_eh_timer_return rtn = BLK_EH_NOT_HANDLED; |
0bf8c869 | 136 | struct Scsi_Host *host = scmd->device->host; |
6c5f8ce1 | 137 | |
bf816235 | 138 | trace_scsi_dispatch_cmd_timeout(scmd); |
1da177e4 LT |
139 | scsi_log_completion(scmd, TIMEOUT_ERROR); |
140 | ||
0bf8c869 JJ |
141 | if (host->transportt->eh_timed_out) |
142 | rtn = host->transportt->eh_timed_out(scmd); | |
143 | else if (host->hostt->eh_timed_out) | |
144 | rtn = host->hostt->eh_timed_out(scmd); | |
1da177e4 | 145 | |
18a4d0a2 MP |
146 | scmd->result |= DID_TIME_OUT << 16; |
147 | ||
fa990781 | 148 | if (unlikely(rtn == BLK_EH_NOT_HANDLED && |
18a4d0a2 | 149 | !scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD))) |
fa990781 | 150 | rtn = BLK_EH_HANDLED; |
242f9dcb | 151 | |
fa990781 | 152 | return rtn; |
1da177e4 LT |
153 | } |
154 | ||
155 | /** | |
156 | * scsi_block_when_processing_errors - Prevent cmds from being queued. | |
157 | * @sdev: Device on which we are performing recovery. | |
158 | * | |
159 | * Description: | |
160 | * We block until the host is out of error recovery, and then check to | |
161 | * see whether the host or the device is offline. | |
162 | * | |
163 | * Return value: | |
164 | * 0 when dev was taken offline by error recovery. 1 OK to proceed. | |
dc8875e1 | 165 | */ |
1da177e4 LT |
166 | int scsi_block_when_processing_errors(struct scsi_device *sdev) |
167 | { | |
168 | int online; | |
169 | ||
939647ee | 170 | wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host)); |
1da177e4 LT |
171 | |
172 | online = scsi_device_online(sdev); | |
173 | ||
cadbd4a5 | 174 | SCSI_LOG_ERROR_RECOVERY(5, printk("%s: rtn: %d\n", __func__, |
1da177e4 LT |
175 | online)); |
176 | ||
177 | return online; | |
178 | } | |
179 | EXPORT_SYMBOL(scsi_block_when_processing_errors); | |
180 | ||
181 | #ifdef CONFIG_SCSI_LOGGING | |
182 | /** | |
183 | * scsi_eh_prt_fail_stats - Log info on failures. | |
184 | * @shost: scsi host being recovered. | |
185 | * @work_q: Queue of scsi cmds to process. | |
dc8875e1 | 186 | */ |
1da177e4 LT |
187 | static inline void scsi_eh_prt_fail_stats(struct Scsi_Host *shost, |
188 | struct list_head *work_q) | |
189 | { | |
190 | struct scsi_cmnd *scmd; | |
191 | struct scsi_device *sdev; | |
192 | int total_failures = 0; | |
193 | int cmd_failed = 0; | |
194 | int cmd_cancel = 0; | |
195 | int devices_failed = 0; | |
196 | ||
197 | shost_for_each_device(sdev, shost) { | |
198 | list_for_each_entry(scmd, work_q, eh_entry) { | |
199 | if (scmd->device == sdev) { | |
200 | ++total_failures; | |
3111b0d1 | 201 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) |
1da177e4 | 202 | ++cmd_cancel; |
0bf8c869 | 203 | else |
1da177e4 LT |
204 | ++cmd_failed; |
205 | } | |
206 | } | |
207 | ||
208 | if (cmd_cancel || cmd_failed) { | |
209 | SCSI_LOG_ERROR_RECOVERY(3, | |
9ccfc756 JB |
210 | sdev_printk(KERN_INFO, sdev, |
211 | "%s: cmds failed: %d, cancel: %d\n", | |
cadbd4a5 | 212 | __func__, cmd_failed, |
9ccfc756 | 213 | cmd_cancel)); |
1da177e4 LT |
214 | cmd_cancel = 0; |
215 | cmd_failed = 0; | |
216 | ++devices_failed; | |
217 | } | |
218 | } | |
219 | ||
220 | SCSI_LOG_ERROR_RECOVERY(2, printk("Total of %d commands on %d" | |
221 | " devices require eh work\n", | |
0bf8c869 | 222 | total_failures, devices_failed)); |
1da177e4 LT |
223 | } |
224 | #endif | |
225 | ||
226 | /** | |
227 | * scsi_check_sense - Examine scsi cmd sense | |
228 | * @scmd: Cmd to have sense checked. | |
229 | * | |
230 | * Return value: | |
87f14e65 | 231 | * SUCCESS or FAILED or NEEDS_RETRY or ADD_TO_MLQUEUE |
1da177e4 LT |
232 | * |
233 | * Notes: | |
234 | * When a deferred error is detected the current command has | |
235 | * not been executed and needs retrying. | |
dc8875e1 | 236 | */ |
1da177e4 LT |
237 | static int scsi_check_sense(struct scsi_cmnd *scmd) |
238 | { | |
a6a8d9f8 | 239 | struct scsi_device *sdev = scmd->device; |
1da177e4 LT |
240 | struct scsi_sense_hdr sshdr; |
241 | ||
242 | if (! scsi_command_normalize_sense(scmd, &sshdr)) | |
243 | return FAILED; /* no valid sense data */ | |
244 | ||
14216561 JB |
245 | if (scmd->cmnd[0] == TEST_UNIT_READY && scmd->scsi_done != scsi_eh_done) |
246 | /* | |
247 | * nasty: for mid-layer issued TURs, we need to return the | |
248 | * actual sense data without any recovery attempt. For eh | |
249 | * issued ones, we need to try to recover and interpret | |
250 | */ | |
251 | return SUCCESS; | |
252 | ||
1da177e4 LT |
253 | if (scsi_sense_is_deferred(&sshdr)) |
254 | return NEEDS_RETRY; | |
255 | ||
a6a8d9f8 CS |
256 | if (sdev->scsi_dh_data && sdev->scsi_dh_data->scsi_dh && |
257 | sdev->scsi_dh_data->scsi_dh->check_sense) { | |
258 | int rc; | |
259 | ||
260 | rc = sdev->scsi_dh_data->scsi_dh->check_sense(sdev, &sshdr); | |
261 | if (rc != SCSI_RETURN_NOT_HANDLED) | |
262 | return rc; | |
263 | /* handler does not care. Drop down to default handling */ | |
264 | } | |
265 | ||
1da177e4 LT |
266 | /* |
267 | * Previous logic looked for FILEMARK, EOM or ILI which are | |
268 | * mainly associated with tapes and returned SUCCESS. | |
269 | */ | |
270 | if (sshdr.response_code == 0x70) { | |
271 | /* fixed format */ | |
272 | if (scmd->sense_buffer[2] & 0xe0) | |
273 | return SUCCESS; | |
274 | } else { | |
275 | /* | |
276 | * descriptor format: look for "stream commands sense data | |
277 | * descriptor" (see SSC-3). Assume single sense data | |
278 | * descriptor. Ignore ILI from SBC-2 READ LONG and WRITE LONG. | |
279 | */ | |
280 | if ((sshdr.additional_length > 3) && | |
281 | (scmd->sense_buffer[8] == 0x4) && | |
282 | (scmd->sense_buffer[11] & 0xe0)) | |
283 | return SUCCESS; | |
284 | } | |
285 | ||
286 | switch (sshdr.sense_key) { | |
287 | case NO_SENSE: | |
288 | return SUCCESS; | |
289 | case RECOVERED_ERROR: | |
290 | return /* soft_error */ SUCCESS; | |
291 | ||
292 | case ABORTED_COMMAND: | |
511e44f4 MP |
293 | if (sshdr.asc == 0x10) /* DIF */ |
294 | return SUCCESS; | |
295 | ||
1da177e4 LT |
296 | return NEEDS_RETRY; |
297 | case NOT_READY: | |
298 | case UNIT_ATTENTION: | |
299 | /* | |
300 | * if we are expecting a cc/ua because of a bus reset that we | |
301 | * performed, treat this just as a retry. otherwise this is | |
302 | * information that we should pass up to the upper-level driver | |
303 | * so that we can deal with it there. | |
304 | */ | |
305 | if (scmd->device->expecting_cc_ua) { | |
dfcf7775 TH |
306 | /* |
307 | * Because some device does not queue unit | |
308 | * attentions correctly, we carefully check | |
309 | * additional sense code and qualifier so as | |
310 | * not to squash media change unit attention. | |
311 | */ | |
312 | if (sshdr.asc != 0x28 || sshdr.ascq != 0x00) { | |
313 | scmd->device->expecting_cc_ua = 0; | |
314 | return NEEDS_RETRY; | |
315 | } | |
1da177e4 LT |
316 | } |
317 | /* | |
0bf8c869 | 318 | * if the device is in the process of becoming ready, we |
1da177e4 LT |
319 | * should retry. |
320 | */ | |
321 | if ((sshdr.asc == 0x04) && (sshdr.ascq == 0x01)) | |
322 | return NEEDS_RETRY; | |
323 | /* | |
324 | * if the device is not started, we need to wake | |
325 | * the error handler to start the motor | |
326 | */ | |
327 | if (scmd->device->allow_restart && | |
328 | (sshdr.asc == 0x04) && (sshdr.ascq == 0x02)) | |
329 | return FAILED; | |
77a42297 | 330 | |
6e49949c MC |
331 | if (sshdr.asc == 0x3f && sshdr.ascq == 0x0e) |
332 | scmd_printk(KERN_WARNING, scmd, | |
333 | "Warning! Received an indication that the " | |
334 | "LUN assignments on this target have " | |
335 | "changed. The Linux SCSI layer does not " | |
336 | "automatically remap LUN assignments.\n"); | |
337 | else if (sshdr.asc == 0x3f) | |
338 | scmd_printk(KERN_WARNING, scmd, | |
339 | "Warning! Received an indication that the " | |
340 | "operating parameters on this target have " | |
341 | "changed. The Linux SCSI layer does not " | |
342 | "automatically adjust these parameters.\n"); | |
343 | ||
deb1cb63 SI |
344 | if (sshdr.asc == 0x38 && sshdr.ascq == 0x07) |
345 | scmd_printk(KERN_WARNING, scmd, | |
346 | "Warning! Received an indication that the " | |
347 | "LUN reached a thin provisioning soft " | |
348 | "threshold.\n"); | |
349 | ||
02e031cb CH |
350 | /* |
351 | * Pass the UA upwards for a determination in the completion | |
352 | * functions. | |
353 | */ | |
354 | return SUCCESS; | |
1da177e4 | 355 | |
63583cca | 356 | /* these are not supported */ |
a9d6ceb8 HR |
357 | case DATA_PROTECT: |
358 | if (sshdr.asc == 0x27 && sshdr.ascq == 0x07) { | |
359 | /* Thin provisioning hard threshold reached */ | |
360 | set_host_byte(scmd, DID_ALLOC_FAILURE); | |
361 | return SUCCESS; | |
362 | } | |
1da177e4 LT |
363 | case COPY_ABORTED: |
364 | case VOLUME_OVERFLOW: | |
365 | case MISCOMPARE: | |
63583cca | 366 | case BLANK_CHECK: |
87f14e65 HR |
367 | set_host_byte(scmd, DID_TARGET_FAILURE); |
368 | return SUCCESS; | |
1da177e4 LT |
369 | |
370 | case MEDIUM_ERROR: | |
fd1b494d LT |
371 | if (sshdr.asc == 0x11 || /* UNRECOVERED READ ERR */ |
372 | sshdr.asc == 0x13 || /* AMNF DATA FIELD */ | |
373 | sshdr.asc == 0x14) { /* RECORD NOT FOUND */ | |
7e782af5 | 374 | set_host_byte(scmd, DID_MEDIUM_ERROR); |
87f14e65 | 375 | return SUCCESS; |
fd1b494d | 376 | } |
1da177e4 LT |
377 | return NEEDS_RETRY; |
378 | ||
379 | case HARDWARE_ERROR: | |
380 | if (scmd->device->retry_hwerror) | |
bb0003c1 | 381 | return ADD_TO_MLQUEUE; |
1da177e4 | 382 | else |
87f14e65 | 383 | set_host_byte(scmd, DID_TARGET_FAILURE); |
1da177e4 LT |
384 | |
385 | case ILLEGAL_REQUEST: | |
47ac56db MS |
386 | if (sshdr.asc == 0x20 || /* Invalid command operation code */ |
387 | sshdr.asc == 0x21 || /* Logical block address out of range */ | |
388 | sshdr.asc == 0x24 || /* Invalid field in cdb */ | |
389 | sshdr.asc == 0x26) { /* Parameter value invalid */ | |
87f14e65 | 390 | set_host_byte(scmd, DID_TARGET_FAILURE); |
47ac56db MS |
391 | } |
392 | return SUCCESS; | |
393 | ||
1da177e4 LT |
394 | default: |
395 | return SUCCESS; | |
396 | } | |
397 | } | |
398 | ||
4a84067d VD |
399 | static void scsi_handle_queue_ramp_up(struct scsi_device *sdev) |
400 | { | |
401 | struct scsi_host_template *sht = sdev->host->hostt; | |
402 | struct scsi_device *tmp_sdev; | |
403 | ||
404 | if (!sht->change_queue_depth || | |
405 | sdev->queue_depth >= sdev->max_queue_depth) | |
406 | return; | |
407 | ||
408 | if (time_before(jiffies, | |
409 | sdev->last_queue_ramp_up + sdev->queue_ramp_up_period)) | |
410 | return; | |
411 | ||
412 | if (time_before(jiffies, | |
413 | sdev->last_queue_full_time + sdev->queue_ramp_up_period)) | |
414 | return; | |
415 | ||
416 | /* | |
417 | * Walk all devices of a target and do | |
418 | * ramp up on them. | |
419 | */ | |
420 | shost_for_each_device(tmp_sdev, sdev->host) { | |
421 | if (tmp_sdev->channel != sdev->channel || | |
422 | tmp_sdev->id != sdev->id || | |
423 | tmp_sdev->queue_depth == sdev->max_queue_depth) | |
424 | continue; | |
425 | /* | |
426 | * call back into LLD to increase queue_depth by one | |
427 | * with ramp up reason code. | |
428 | */ | |
429 | sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth + 1, | |
430 | SCSI_QDEPTH_RAMP_UP); | |
431 | sdev->last_queue_ramp_up = jiffies; | |
432 | } | |
433 | } | |
434 | ||
42a6a918 MC |
435 | static void scsi_handle_queue_full(struct scsi_device *sdev) |
436 | { | |
437 | struct scsi_host_template *sht = sdev->host->hostt; | |
438 | struct scsi_device *tmp_sdev; | |
439 | ||
440 | if (!sht->change_queue_depth) | |
441 | return; | |
442 | ||
443 | shost_for_each_device(tmp_sdev, sdev->host) { | |
444 | if (tmp_sdev->channel != sdev->channel || | |
445 | tmp_sdev->id != sdev->id) | |
446 | continue; | |
447 | /* | |
448 | * We do not know the number of commands that were at | |
449 | * the device when we got the queue full so we start | |
450 | * from the highest possible value and work our way down. | |
451 | */ | |
452 | sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth - 1, | |
453 | SCSI_QDEPTH_QFULL); | |
454 | } | |
455 | } | |
456 | ||
1da177e4 LT |
457 | /** |
458 | * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD. | |
459 | * @scmd: SCSI cmd to examine. | |
460 | * | |
461 | * Notes: | |
462 | * This is *only* called when we are examining the status of commands | |
463 | * queued during error recovery. the main difference here is that we | |
464 | * don't allow for the possibility of retries here, and we are a lot | |
465 | * more restrictive about what we consider acceptable. | |
dc8875e1 | 466 | */ |
1da177e4 LT |
467 | static int scsi_eh_completed_normally(struct scsi_cmnd *scmd) |
468 | { | |
469 | /* | |
470 | * first check the host byte, to see if there is anything in there | |
471 | * that would indicate what we need to do. | |
472 | */ | |
473 | if (host_byte(scmd->result) == DID_RESET) { | |
474 | /* | |
475 | * rats. we are already in the error handler, so we now | |
476 | * get to try and figure out what to do next. if the sense | |
477 | * is valid, we have a pretty good idea of what to do. | |
478 | * if not, we mark it as FAILED. | |
479 | */ | |
480 | return scsi_check_sense(scmd); | |
481 | } | |
482 | if (host_byte(scmd->result) != DID_OK) | |
483 | return FAILED; | |
484 | ||
485 | /* | |
486 | * next, check the message byte. | |
487 | */ | |
488 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
489 | return FAILED; | |
490 | ||
491 | /* | |
492 | * now, check the status byte to see if this indicates | |
493 | * anything special. | |
494 | */ | |
495 | switch (status_byte(scmd->result)) { | |
496 | case GOOD: | |
4a84067d | 497 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 LT |
498 | case COMMAND_TERMINATED: |
499 | return SUCCESS; | |
500 | case CHECK_CONDITION: | |
501 | return scsi_check_sense(scmd); | |
502 | case CONDITION_GOOD: | |
503 | case INTERMEDIATE_GOOD: | |
504 | case INTERMEDIATE_C_GOOD: | |
505 | /* | |
506 | * who knows? FIXME(eric) | |
507 | */ | |
508 | return SUCCESS; | |
5f91bb05 | 509 | case RESERVATION_CONFLICT: |
67110dfd JB |
510 | if (scmd->cmnd[0] == TEST_UNIT_READY) |
511 | /* it is a success, we probed the device and | |
512 | * found it */ | |
513 | return SUCCESS; | |
514 | /* otherwise, we failed to send the command */ | |
515 | return FAILED; | |
1da177e4 | 516 | case QUEUE_FULL: |
42a6a918 MC |
517 | scsi_handle_queue_full(scmd->device); |
518 | /* fall through */ | |
519 | case BUSY: | |
3eb3a928 | 520 | return NEEDS_RETRY; |
1da177e4 LT |
521 | default: |
522 | return FAILED; | |
523 | } | |
524 | return FAILED; | |
525 | } | |
526 | ||
1da177e4 LT |
527 | /** |
528 | * scsi_eh_done - Completion function for error handling. | |
529 | * @scmd: Cmd that is done. | |
dc8875e1 | 530 | */ |
1da177e4 LT |
531 | static void scsi_eh_done(struct scsi_cmnd *scmd) |
532 | { | |
0bf8c869 | 533 | struct completion *eh_action; |
85631672 | 534 | |
7dfdc9a5 CH |
535 | SCSI_LOG_ERROR_RECOVERY(3, |
536 | printk("%s scmd: %p result: %x\n", | |
cadbd4a5 | 537 | __func__, scmd, scmd->result)); |
85631672 MR |
538 | |
539 | eh_action = scmd->device->host->eh_action; | |
540 | if (eh_action) | |
541 | complete(eh_action); | |
1da177e4 LT |
542 | } |
543 | ||
292148f8 BK |
544 | /** |
545 | * scsi_try_host_reset - ask host adapter to reset itself | |
c2b3ebd0 | 546 | * @scmd: SCSI cmd to send host reset. |
dc8875e1 | 547 | */ |
292148f8 BK |
548 | static int scsi_try_host_reset(struct scsi_cmnd *scmd) |
549 | { | |
550 | unsigned long flags; | |
551 | int rtn; | |
0bf8c869 JJ |
552 | struct Scsi_Host *host = scmd->device->host; |
553 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 BK |
554 | |
555 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Host RST\n", | |
cadbd4a5 | 556 | __func__)); |
292148f8 | 557 | |
0bf8c869 | 558 | if (!hostt->eh_host_reset_handler) |
292148f8 BK |
559 | return FAILED; |
560 | ||
0bf8c869 | 561 | rtn = hostt->eh_host_reset_handler(scmd); |
292148f8 BK |
562 | |
563 | if (rtn == SUCCESS) { | |
0bf8c869 | 564 | if (!hostt->skip_settle_delay) |
292148f8 | 565 | ssleep(HOST_RESET_SETTLE_TIME); |
0bf8c869 JJ |
566 | spin_lock_irqsave(host->host_lock, flags); |
567 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
568 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
569 | } |
570 | ||
571 | return rtn; | |
572 | } | |
573 | ||
574 | /** | |
575 | * scsi_try_bus_reset - ask host to perform a bus reset | |
576 | * @scmd: SCSI cmd to send bus reset. | |
dc8875e1 | 577 | */ |
292148f8 BK |
578 | static int scsi_try_bus_reset(struct scsi_cmnd *scmd) |
579 | { | |
580 | unsigned long flags; | |
581 | int rtn; | |
0bf8c869 JJ |
582 | struct Scsi_Host *host = scmd->device->host; |
583 | struct scsi_host_template *hostt = host->hostt; | |
292148f8 BK |
584 | |
585 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Snd Bus RST\n", | |
cadbd4a5 | 586 | __func__)); |
292148f8 | 587 | |
0bf8c869 | 588 | if (!hostt->eh_bus_reset_handler) |
292148f8 BK |
589 | return FAILED; |
590 | ||
0bf8c869 | 591 | rtn = hostt->eh_bus_reset_handler(scmd); |
292148f8 BK |
592 | |
593 | if (rtn == SUCCESS) { | |
0bf8c869 | 594 | if (!hostt->skip_settle_delay) |
292148f8 | 595 | ssleep(BUS_RESET_SETTLE_TIME); |
0bf8c869 JJ |
596 | spin_lock_irqsave(host->host_lock, flags); |
597 | scsi_report_bus_reset(host, scmd_channel(scmd)); | |
598 | spin_unlock_irqrestore(host->host_lock, flags); | |
292148f8 BK |
599 | } |
600 | ||
601 | return rtn; | |
602 | } | |
603 | ||
30bd7df8 MC |
604 | static void __scsi_report_device_reset(struct scsi_device *sdev, void *data) |
605 | { | |
606 | sdev->was_reset = 1; | |
607 | sdev->expecting_cc_ua = 1; | |
608 | } | |
609 | ||
610 | /** | |
611 | * scsi_try_target_reset - Ask host to perform a target reset | |
612 | * @scmd: SCSI cmd used to send a target reset | |
613 | * | |
614 | * Notes: | |
615 | * There is no timeout for this operation. if this operation is | |
616 | * unreliable for a given host, then the host itself needs to put a | |
617 | * timer on it, and set the host back to a consistent state prior to | |
618 | * returning. | |
619 | */ | |
620 | static int scsi_try_target_reset(struct scsi_cmnd *scmd) | |
621 | { | |
622 | unsigned long flags; | |
623 | int rtn; | |
0bf8c869 JJ |
624 | struct Scsi_Host *host = scmd->device->host; |
625 | struct scsi_host_template *hostt = host->hostt; | |
30bd7df8 | 626 | |
0bf8c869 | 627 | if (!hostt->eh_target_reset_handler) |
30bd7df8 MC |
628 | return FAILED; |
629 | ||
0bf8c869 | 630 | rtn = hostt->eh_target_reset_handler(scmd); |
30bd7df8 | 631 | if (rtn == SUCCESS) { |
0bf8c869 | 632 | spin_lock_irqsave(host->host_lock, flags); |
30bd7df8 MC |
633 | __starget_for_each_device(scsi_target(scmd->device), NULL, |
634 | __scsi_report_device_reset); | |
0bf8c869 | 635 | spin_unlock_irqrestore(host->host_lock, flags); |
30bd7df8 MC |
636 | } |
637 | ||
638 | return rtn; | |
639 | } | |
640 | ||
292148f8 BK |
641 | /** |
642 | * scsi_try_bus_device_reset - Ask host to perform a BDR on a dev | |
643 | * @scmd: SCSI cmd used to send BDR | |
644 | * | |
645 | * Notes: | |
646 | * There is no timeout for this operation. if this operation is | |
647 | * unreliable for a given host, then the host itself needs to put a | |
648 | * timer on it, and set the host back to a consistent state prior to | |
649 | * returning. | |
dc8875e1 | 650 | */ |
292148f8 BK |
651 | static int scsi_try_bus_device_reset(struct scsi_cmnd *scmd) |
652 | { | |
653 | int rtn; | |
0bf8c869 | 654 | struct scsi_host_template *hostt = scmd->device->host->hostt; |
292148f8 | 655 | |
0bf8c869 | 656 | if (!hostt->eh_device_reset_handler) |
292148f8 BK |
657 | return FAILED; |
658 | ||
0bf8c869 | 659 | rtn = hostt->eh_device_reset_handler(scmd); |
30bd7df8 MC |
660 | if (rtn == SUCCESS) |
661 | __scsi_report_device_reset(scmd->device, NULL); | |
292148f8 BK |
662 | return rtn; |
663 | } | |
664 | ||
0bf8c869 | 665 | static int scsi_try_to_abort_cmd(struct scsi_host_template *hostt, struct scsi_cmnd *scmd) |
292148f8 | 666 | { |
0bf8c869 | 667 | if (!hostt->eh_abort_handler) |
292148f8 BK |
668 | return FAILED; |
669 | ||
0bf8c869 | 670 | return hostt->eh_abort_handler(scmd); |
292148f8 BK |
671 | } |
672 | ||
292148f8 BK |
673 | static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd) |
674 | { | |
0bf8c869 | 675 | if (scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd) != SUCCESS) |
292148f8 | 676 | if (scsi_try_bus_device_reset(scmd) != SUCCESS) |
30bd7df8 MC |
677 | if (scsi_try_target_reset(scmd) != SUCCESS) |
678 | if (scsi_try_bus_reset(scmd) != SUCCESS) | |
679 | scsi_try_host_reset(scmd); | |
292148f8 BK |
680 | } |
681 | ||
1da177e4 | 682 | /** |
3b729f76 | 683 | * scsi_eh_prep_cmnd - Save a scsi command info as part of error recovery |
2dc611de | 684 | * @scmd: SCSI command structure to hijack |
e1c23468 | 685 | * @ses: structure to save restore information |
55db6c1b | 686 | * @cmnd: CDB to send. Can be NULL if no new cmnd is needed |
64a87b24 | 687 | * @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB) |
55db6c1b | 688 | * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored) |
2dc611de | 689 | * |
e1c23468 | 690 | * This function is used to save a scsi command information before re-execution |
55db6c1b BH |
691 | * as part of the error recovery process. If @sense_bytes is 0 the command |
692 | * sent must be one that does not transfer any data. If @sense_bytes != 0 | |
693 | * @cmnd is ignored and this functions sets up a REQUEST_SENSE command | |
694 | * and cmnd buffers to read @sense_bytes into @scmd->sense_buffer. | |
dc8875e1 | 695 | */ |
e1c23468 BH |
696 | void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, |
697 | unsigned char *cmnd, int cmnd_size, unsigned sense_bytes) | |
1da177e4 | 698 | { |
f59114b7 | 699 | struct scsi_device *sdev = scmd->device; |
1da177e4 | 700 | |
631c228c CH |
701 | /* |
702 | * We need saved copies of a number of fields - this is because | |
703 | * error handling may need to overwrite these with different values | |
704 | * to run different commands, and once error handling is complete, | |
705 | * we will need to restore these values prior to running the actual | |
706 | * command. | |
707 | */ | |
e1c23468 | 708 | ses->cmd_len = scmd->cmd_len; |
64a87b24 | 709 | ses->cmnd = scmd->cmnd; |
e1c23468 | 710 | ses->data_direction = scmd->sc_data_direction; |
30b0c37b | 711 | ses->sdb = scmd->sdb; |
6f9a35e2 | 712 | ses->next_rq = scmd->request->next_rq; |
e1c23468 | 713 | ses->result = scmd->result; |
12265709 | 714 | ses->underflow = scmd->underflow; |
db007fc5 | 715 | ses->prot_op = scmd->prot_op; |
631c228c | 716 | |
db007fc5 | 717 | scmd->prot_op = SCSI_PROT_NORMAL; |
64a87b24 BH |
718 | scmd->cmnd = ses->eh_cmnd; |
719 | memset(scmd->cmnd, 0, BLK_MAX_CDB); | |
30b0c37b | 720 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
6f9a35e2 | 721 | scmd->request->next_rq = NULL; |
30b0c37b | 722 | |
55db6c1b | 723 | if (sense_bytes) { |
30b0c37b BH |
724 | scmd->sdb.length = min_t(unsigned, SCSI_SENSE_BUFFERSIZE, |
725 | sense_bytes); | |
e1c23468 | 726 | sg_init_one(&ses->sense_sgl, scmd->sense_buffer, |
30b0c37b BH |
727 | scmd->sdb.length); |
728 | scmd->sdb.table.sgl = &ses->sense_sgl; | |
55db6c1b | 729 | scmd->sc_data_direction = DMA_FROM_DEVICE; |
30b0c37b | 730 | scmd->sdb.table.nents = 1; |
55db6c1b | 731 | scmd->cmnd[0] = REQUEST_SENSE; |
30b0c37b | 732 | scmd->cmnd[4] = scmd->sdb.length; |
55db6c1b | 733 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); |
631c228c | 734 | } else { |
631c228c | 735 | scmd->sc_data_direction = DMA_NONE; |
55db6c1b | 736 | if (cmnd) { |
64a87b24 | 737 | BUG_ON(cmnd_size > BLK_MAX_CDB); |
55db6c1b BH |
738 | memcpy(scmd->cmnd, cmnd, cmnd_size); |
739 | scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); | |
740 | } | |
631c228c CH |
741 | } |
742 | ||
743 | scmd->underflow = 0; | |
631c228c | 744 | |
55db6c1b | 745 | if (sdev->scsi_level <= SCSI_2 && sdev->scsi_level != SCSI_UNKNOWN) |
1da177e4 | 746 | scmd->cmnd[1] = (scmd->cmnd[1] & 0x1f) | |
f59114b7 | 747 | (sdev->lun << 5 & 0xe0); |
1da177e4 | 748 | |
631c228c CH |
749 | /* |
750 | * Zero the sense buffer. The scsi spec mandates that any | |
751 | * untransferred sense data should be interpreted as being zero. | |
752 | */ | |
b80ca4f7 | 753 | memset(scmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); |
e1c23468 BH |
754 | } |
755 | EXPORT_SYMBOL(scsi_eh_prep_cmnd); | |
756 | ||
757 | /** | |
3b729f76 | 758 | * scsi_eh_restore_cmnd - Restore a scsi command info as part of error recovery |
e1c23468 | 759 | * @scmd: SCSI command structure to restore |
477e608c | 760 | * @ses: saved information from a coresponding call to scsi_eh_prep_cmnd |
e1c23468 | 761 | * |
477e608c | 762 | * Undo any damage done by above scsi_eh_prep_cmnd(). |
dc8875e1 | 763 | */ |
e1c23468 BH |
764 | void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses) |
765 | { | |
766 | /* | |
767 | * Restore original data | |
768 | */ | |
769 | scmd->cmd_len = ses->cmd_len; | |
64a87b24 | 770 | scmd->cmnd = ses->cmnd; |
e1c23468 | 771 | scmd->sc_data_direction = ses->data_direction; |
30b0c37b | 772 | scmd->sdb = ses->sdb; |
6f9a35e2 | 773 | scmd->request->next_rq = ses->next_rq; |
e1c23468 | 774 | scmd->result = ses->result; |
12265709 | 775 | scmd->underflow = ses->underflow; |
db007fc5 | 776 | scmd->prot_op = ses->prot_op; |
e1c23468 BH |
777 | } |
778 | EXPORT_SYMBOL(scsi_eh_restore_cmnd); | |
631c228c | 779 | |
e1c23468 | 780 | /** |
3b729f76 | 781 | * scsi_send_eh_cmnd - submit a scsi command as part of error recovery |
e1c23468 BH |
782 | * @scmd: SCSI command structure to hijack |
783 | * @cmnd: CDB to send | |
784 | * @cmnd_size: size in bytes of @cmnd | |
785 | * @timeout: timeout for this request | |
786 | * @sense_bytes: size of sense data to copy or 0 | |
787 | * | |
788 | * This function is used to send a scsi command down to a target device | |
789 | * as part of the error recovery process. See also scsi_eh_prep_cmnd() above. | |
790 | * | |
791 | * Return value: | |
792 | * SUCCESS or FAILED or NEEDS_RETRY | |
dc8875e1 | 793 | */ |
e1c23468 BH |
794 | static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd, |
795 | int cmnd_size, int timeout, unsigned sense_bytes) | |
796 | { | |
797 | struct scsi_device *sdev = scmd->device; | |
798 | struct Scsi_Host *shost = sdev->host; | |
799 | DECLARE_COMPLETION_ONSTACK(done); | |
fc73648a | 800 | unsigned long timeleft = timeout; |
e1c23468 | 801 | struct scsi_eh_save ses; |
fc73648a | 802 | const unsigned long stall_for = msecs_to_jiffies(100); |
e1c23468 BH |
803 | int rtn; |
804 | ||
fc73648a | 805 | retry: |
e1c23468 | 806 | scsi_eh_prep_cmnd(scmd, &ses, cmnd, cmnd_size, sense_bytes); |
7dfdc9a5 | 807 | shost->eh_action = &done; |
1da177e4 | 808 | |
1da177e4 | 809 | scsi_log_send(scmd); |
f281233d | 810 | scmd->scsi_done = scsi_eh_done; |
fc73648a HR |
811 | rtn = shost->hostt->queuecommand(shost, scmd); |
812 | if (rtn) { | |
813 | if (timeleft > stall_for) { | |
814 | scsi_eh_restore_cmnd(scmd, &ses); | |
815 | timeleft -= stall_for; | |
816 | msleep(jiffies_to_msecs(stall_for)); | |
817 | goto retry; | |
818 | } | |
819 | /* signal not to enter either branch of the if () below */ | |
820 | timeleft = 0; | |
821 | rtn = NEEDS_RETRY; | |
822 | } else { | |
823 | timeleft = wait_for_completion_timeout(&done, timeout); | |
824 | } | |
1da177e4 | 825 | |
f59114b7 | 826 | shost->eh_action = NULL; |
1da177e4 | 827 | |
fc73648a | 828 | scsi_log_completion(scmd, rtn); |
1da177e4 | 829 | |
7dfdc9a5 CH |
830 | SCSI_LOG_ERROR_RECOVERY(3, |
831 | printk("%s: scmd: %p, timeleft: %ld\n", | |
cadbd4a5 | 832 | __func__, scmd, timeleft)); |
1da177e4 LT |
833 | |
834 | /* | |
fc73648a HR |
835 | * If there is time left scsi_eh_done got called, and we will examine |
836 | * the actual status codes to see whether the command actually did | |
837 | * complete normally, else if we have a zero return and no time left, | |
838 | * the command must still be pending, so abort it and return FAILED. | |
839 | * If we never actually managed to issue the command, because | |
840 | * ->queuecommand() kept returning non zero, use the rtn = FAILED | |
841 | * value above (so don't execute either branch of the if) | |
1da177e4 | 842 | */ |
7dfdc9a5 | 843 | if (timeleft) { |
1da177e4 LT |
844 | rtn = scsi_eh_completed_normally(scmd); |
845 | SCSI_LOG_ERROR_RECOVERY(3, | |
846 | printk("%s: scsi_eh_completed_normally %x\n", | |
cadbd4a5 | 847 | __func__, rtn)); |
7dfdc9a5 | 848 | |
1da177e4 LT |
849 | switch (rtn) { |
850 | case SUCCESS: | |
851 | case NEEDS_RETRY: | |
852 | case FAILED: | |
853 | break; | |
6e883b0e HR |
854 | case ADD_TO_MLQUEUE: |
855 | rtn = NEEDS_RETRY; | |
856 | break; | |
1da177e4 LT |
857 | default: |
858 | rtn = FAILED; | |
859 | break; | |
860 | } | |
fc73648a | 861 | } else if (!rtn) { |
292148f8 | 862 | scsi_abort_eh_cmnd(scmd); |
7dfdc9a5 | 863 | rtn = FAILED; |
1da177e4 LT |
864 | } |
865 | ||
e1c23468 | 866 | scsi_eh_restore_cmnd(scmd, &ses); |
18a4d0a2 | 867 | |
329a402c LZ |
868 | if (scmd->request->cmd_type != REQ_TYPE_BLOCK_PC) { |
869 | struct scsi_driver *sdrv = scsi_cmd_to_driver(scmd); | |
870 | if (sdrv->eh_action) | |
871 | rtn = sdrv->eh_action(scmd, cmnd, cmnd_size, rtn); | |
872 | } | |
18a4d0a2 | 873 | |
1da177e4 LT |
874 | return rtn; |
875 | } | |
876 | ||
877 | /** | |
878 | * scsi_request_sense - Request sense data from a particular target. | |
879 | * @scmd: SCSI cmd for request sense. | |
880 | * | |
881 | * Notes: | |
882 | * Some hosts automatically obtain this information, others require | |
883 | * that we obtain it on our own. This function will *not* return until | |
884 | * the command either times out, or it completes. | |
dc8875e1 | 885 | */ |
1da177e4 LT |
886 | static int scsi_request_sense(struct scsi_cmnd *scmd) |
887 | { | |
0816c925 | 888 | return scsi_send_eh_cmnd(scmd, NULL, 0, scmd->device->eh_timeout, ~0); |
1da177e4 LT |
889 | } |
890 | ||
891 | /** | |
892 | * scsi_eh_finish_cmd - Handle a cmd that eh is finished with. | |
893 | * @scmd: Original SCSI cmd that eh has finished. | |
894 | * @done_q: Queue for processed commands. | |
895 | * | |
896 | * Notes: | |
897 | * We don't want to use the normal command completion while we are are | |
898 | * still handling errors - it may cause other commands to be queued, | |
eb44820c | 899 | * and that would disturb what we are doing. Thus we really want to |
1da177e4 LT |
900 | * keep a list of pending commands for final completion, and once we |
901 | * are ready to leave error handling we handle completion for real. | |
dc8875e1 | 902 | */ |
041c5fc3 | 903 | void scsi_eh_finish_cmd(struct scsi_cmnd *scmd, struct list_head *done_q) |
1da177e4 LT |
904 | { |
905 | scmd->device->host->host_failed--; | |
3111b0d1 | 906 | scmd->eh_eflags = 0; |
1da177e4 LT |
907 | list_move_tail(&scmd->eh_entry, done_q); |
908 | } | |
041c5fc3 | 909 | EXPORT_SYMBOL(scsi_eh_finish_cmd); |
1da177e4 LT |
910 | |
911 | /** | |
912 | * scsi_eh_get_sense - Get device sense data. | |
913 | * @work_q: Queue of commands to process. | |
eb44820c | 914 | * @done_q: Queue of processed commands. |
1da177e4 LT |
915 | * |
916 | * Description: | |
917 | * See if we need to request sense information. if so, then get it | |
0bf8c869 | 918 | * now, so we have a better idea of what to do. |
1da177e4 LT |
919 | * |
920 | * Notes: | |
921 | * This has the unfortunate side effect that if a shost adapter does | |
eb44820c | 922 | * not automatically request sense information, we end up shutting |
1da177e4 LT |
923 | * it down before we request it. |
924 | * | |
925 | * All drivers should request sense information internally these days, | |
926 | * so for now all I have to say is tough noogies if you end up in here. | |
927 | * | |
928 | * XXX: Long term this code should go away, but that needs an audit of | |
929 | * all LLDDs first. | |
dc8875e1 | 930 | */ |
dca84e46 DW |
931 | int scsi_eh_get_sense(struct list_head *work_q, |
932 | struct list_head *done_q) | |
1da177e4 | 933 | { |
937abeaa | 934 | struct scsi_cmnd *scmd, *next; |
1da177e4 LT |
935 | int rtn; |
936 | ||
937abeaa | 937 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 938 | if ((scmd->eh_eflags & SCSI_EH_CANCEL_CMD) || |
1da177e4 LT |
939 | SCSI_SENSE_VALID(scmd)) |
940 | continue; | |
941 | ||
3bf743e7 JG |
942 | SCSI_LOG_ERROR_RECOVERY(2, scmd_printk(KERN_INFO, scmd, |
943 | "%s: requesting sense\n", | |
944 | current->comm)); | |
1da177e4 LT |
945 | rtn = scsi_request_sense(scmd); |
946 | if (rtn != SUCCESS) | |
947 | continue; | |
948 | ||
949 | SCSI_LOG_ERROR_RECOVERY(3, printk("sense requested for %p" | |
950 | " result %x\n", scmd, | |
951 | scmd->result)); | |
952 | SCSI_LOG_ERROR_RECOVERY(3, scsi_print_sense("bh", scmd)); | |
953 | ||
954 | rtn = scsi_decide_disposition(scmd); | |
955 | ||
956 | /* | |
957 | * if the result was normal, then just pass it along to the | |
958 | * upper level. | |
959 | */ | |
960 | if (rtn == SUCCESS) | |
961 | /* we don't want this command reissued, just | |
962 | * finished with the sense data, so set | |
963 | * retries to the max allowed to ensure it | |
964 | * won't get reissued */ | |
965 | scmd->retries = scmd->allowed; | |
966 | else if (rtn != NEEDS_RETRY) | |
967 | continue; | |
968 | ||
969 | scsi_eh_finish_cmd(scmd, done_q); | |
970 | } | |
971 | ||
972 | return list_empty(work_q); | |
973 | } | |
dca84e46 | 974 | EXPORT_SYMBOL_GPL(scsi_eh_get_sense); |
1da177e4 | 975 | |
1da177e4 LT |
976 | /** |
977 | * scsi_eh_tur - Send TUR to device. | |
eb44820c | 978 | * @scmd: &scsi_cmnd to send TUR |
1da177e4 LT |
979 | * |
980 | * Return value: | |
981 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 982 | */ |
1da177e4 LT |
983 | static int scsi_eh_tur(struct scsi_cmnd *scmd) |
984 | { | |
985 | static unsigned char tur_command[6] = {TEST_UNIT_READY, 0, 0, 0, 0, 0}; | |
986 | int retry_cnt = 1, rtn; | |
987 | ||
988 | retry_tur: | |
0816c925 MP |
989 | rtn = scsi_send_eh_cmnd(scmd, tur_command, 6, |
990 | scmd->device->eh_timeout, 0); | |
1da177e4 | 991 | |
1da177e4 | 992 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: scmd %p rtn %x\n", |
cadbd4a5 | 993 | __func__, scmd, rtn)); |
631c228c CH |
994 | |
995 | switch (rtn) { | |
996 | case NEEDS_RETRY: | |
1da177e4 LT |
997 | if (retry_cnt--) |
998 | goto retry_tur; | |
631c228c CH |
999 | /*FALLTHRU*/ |
1000 | case SUCCESS: | |
e47373ec | 1001 | return 0; |
631c228c CH |
1002 | default: |
1003 | return 1; | |
e47373ec | 1004 | } |
1da177e4 LT |
1005 | } |
1006 | ||
3eef6257 DJ |
1007 | /** |
1008 | * scsi_eh_test_devices - check if devices are responding from error recovery. | |
1009 | * @cmd_list: scsi commands in error recovery. | |
1010 | * @work_q: queue for commands which still need more error recovery | |
1011 | * @done_q: queue for commands which are finished | |
1012 | * @try_stu: boolean on if a STU command should be tried in addition to TUR. | |
1013 | * | |
1014 | * Decription: | |
1015 | * Tests if devices are in a working state. Commands to devices now in | |
1016 | * a working state are sent to the done_q while commands to devices which | |
1017 | * are still failing to respond are returned to the work_q for more | |
1018 | * processing. | |
1019 | **/ | |
1020 | static int scsi_eh_test_devices(struct list_head *cmd_list, | |
1021 | struct list_head *work_q, | |
1022 | struct list_head *done_q, int try_stu) | |
1023 | { | |
1024 | struct scsi_cmnd *scmd, *next; | |
1025 | struct scsi_device *sdev; | |
1026 | int finish_cmds; | |
1027 | ||
1028 | while (!list_empty(cmd_list)) { | |
1029 | scmd = list_entry(cmd_list->next, struct scsi_cmnd, eh_entry); | |
1030 | sdev = scmd->device; | |
1031 | ||
1032 | finish_cmds = !scsi_device_online(scmd->device) || | |
1033 | (try_stu && !scsi_eh_try_stu(scmd) && | |
1034 | !scsi_eh_tur(scmd)) || | |
1035 | !scsi_eh_tur(scmd); | |
1036 | ||
1037 | list_for_each_entry_safe(scmd, next, cmd_list, eh_entry) | |
1038 | if (scmd->device == sdev) { | |
1039 | if (finish_cmds) | |
1040 | scsi_eh_finish_cmd(scmd, done_q); | |
1041 | else | |
1042 | list_move_tail(&scmd->eh_entry, work_q); | |
1043 | } | |
1044 | } | |
1045 | return list_empty(work_q); | |
1046 | } | |
1047 | ||
1048 | ||
1da177e4 | 1049 | /** |
eb44820c RL |
1050 | * scsi_eh_abort_cmds - abort pending commands. |
1051 | * @work_q: &list_head for pending commands. | |
1052 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1053 | * |
1054 | * Decription: | |
1055 | * Try and see whether or not it makes sense to try and abort the | |
eb44820c RL |
1056 | * running command. This only works out to be the case if we have one |
1057 | * command that has timed out. If the command simply failed, it makes | |
1da177e4 LT |
1058 | * no sense to try and abort the command, since as far as the shost |
1059 | * adapter is concerned, it isn't running. | |
dc8875e1 | 1060 | */ |
1da177e4 LT |
1061 | static int scsi_eh_abort_cmds(struct list_head *work_q, |
1062 | struct list_head *done_q) | |
1063 | { | |
937abeaa | 1064 | struct scsi_cmnd *scmd, *next; |
3eef6257 | 1065 | LIST_HEAD(check_list); |
1da177e4 LT |
1066 | int rtn; |
1067 | ||
937abeaa | 1068 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3111b0d1 | 1069 | if (!(scmd->eh_eflags & SCSI_EH_CANCEL_CMD)) |
1da177e4 LT |
1070 | continue; |
1071 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting cmd:" | |
1072 | "0x%p\n", current->comm, | |
1073 | scmd)); | |
0bf8c869 | 1074 | rtn = scsi_try_to_abort_cmd(scmd->device->host->hostt, scmd); |
2f2eb587 | 1075 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
3111b0d1 | 1076 | scmd->eh_eflags &= ~SCSI_EH_CANCEL_CMD; |
3eef6257 | 1077 | if (rtn == FAST_IO_FAIL) |
1da177e4 | 1078 | scsi_eh_finish_cmd(scmd, done_q); |
3eef6257 DJ |
1079 | else |
1080 | list_move_tail(&scmd->eh_entry, &check_list); | |
1da177e4 LT |
1081 | } else |
1082 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: aborting" | |
1083 | " cmd failed:" | |
1084 | "0x%p\n", | |
1085 | current->comm, | |
1086 | scmd)); | |
1087 | } | |
1088 | ||
3eef6257 | 1089 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4 LT |
1090 | } |
1091 | ||
1da177e4 LT |
1092 | /** |
1093 | * scsi_eh_try_stu - Send START_UNIT to device. | |
eb44820c | 1094 | * @scmd: &scsi_cmnd to send START_UNIT |
1da177e4 LT |
1095 | * |
1096 | * Return value: | |
1097 | * 0 - Device is ready. 1 - Device NOT ready. | |
dc8875e1 | 1098 | */ |
1da177e4 LT |
1099 | static int scsi_eh_try_stu(struct scsi_cmnd *scmd) |
1100 | { | |
1101 | static unsigned char stu_command[6] = {START_STOP, 0, 0, 0, 1, 0}; | |
1da177e4 | 1102 | |
631c228c | 1103 | if (scmd->device->allow_restart) { |
ed773e66 BK |
1104 | int i, rtn = NEEDS_RETRY; |
1105 | ||
1106 | for (i = 0; rtn == NEEDS_RETRY && i < 2; i++) | |
9728c081 | 1107 | rtn = scsi_send_eh_cmnd(scmd, stu_command, 6, scmd->device->request_queue->rq_timeout, 0); |
1da177e4 | 1108 | |
631c228c CH |
1109 | if (rtn == SUCCESS) |
1110 | return 0; | |
1111 | } | |
1da177e4 | 1112 | |
1da177e4 LT |
1113 | return 1; |
1114 | } | |
1115 | ||
1116 | /** | |
1117 | * scsi_eh_stu - send START_UNIT if needed | |
eb44820c RL |
1118 | * @shost: &scsi host being recovered. |
1119 | * @work_q: &list_head for pending commands. | |
1120 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1121 | * |
1122 | * Notes: | |
1123 | * If commands are failing due to not ready, initializing command required, | |
0bf8c869 | 1124 | * try revalidating the device, which will end up sending a start unit. |
dc8875e1 | 1125 | */ |
1da177e4 LT |
1126 | static int scsi_eh_stu(struct Scsi_Host *shost, |
1127 | struct list_head *work_q, | |
1128 | struct list_head *done_q) | |
1129 | { | |
937abeaa | 1130 | struct scsi_cmnd *scmd, *stu_scmd, *next; |
1da177e4 LT |
1131 | struct scsi_device *sdev; |
1132 | ||
1133 | shost_for_each_device(sdev, shost) { | |
1134 | stu_scmd = NULL; | |
1135 | list_for_each_entry(scmd, work_q, eh_entry) | |
1136 | if (scmd->device == sdev && SCSI_SENSE_VALID(scmd) && | |
1137 | scsi_check_sense(scmd) == FAILED ) { | |
1138 | stu_scmd = scmd; | |
1139 | break; | |
1140 | } | |
1141 | ||
1142 | if (!stu_scmd) | |
1143 | continue; | |
1144 | ||
1145 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending START_UNIT to sdev:" | |
1146 | " 0x%p\n", current->comm, sdev)); | |
1147 | ||
1148 | if (!scsi_eh_try_stu(stu_scmd)) { | |
1149 | if (!scsi_device_online(sdev) || | |
1150 | !scsi_eh_tur(stu_scmd)) { | |
937abeaa CH |
1151 | list_for_each_entry_safe(scmd, next, |
1152 | work_q, eh_entry) { | |
1da177e4 LT |
1153 | if (scmd->device == sdev) |
1154 | scsi_eh_finish_cmd(scmd, done_q); | |
1155 | } | |
1156 | } | |
1157 | } else { | |
1158 | SCSI_LOG_ERROR_RECOVERY(3, | |
1159 | printk("%s: START_UNIT failed to sdev:" | |
1160 | " 0x%p\n", current->comm, sdev)); | |
1161 | } | |
1162 | } | |
1163 | ||
1164 | return list_empty(work_q); | |
1165 | } | |
1166 | ||
1167 | ||
1168 | /** | |
1169 | * scsi_eh_bus_device_reset - send bdr if needed | |
1170 | * @shost: scsi host being recovered. | |
eb44820c RL |
1171 | * @work_q: &list_head for pending commands. |
1172 | * @done_q: &list_head for processed commands. | |
1da177e4 LT |
1173 | * |
1174 | * Notes: | |
eb44820c | 1175 | * Try a bus device reset. Still, look to see whether we have multiple |
1da177e4 LT |
1176 | * devices that are jammed or not - if we have multiple devices, it |
1177 | * makes no sense to try bus_device_reset - we really would need to try | |
0bf8c869 | 1178 | * a bus_reset instead. |
dc8875e1 | 1179 | */ |
1da177e4 LT |
1180 | static int scsi_eh_bus_device_reset(struct Scsi_Host *shost, |
1181 | struct list_head *work_q, | |
1182 | struct list_head *done_q) | |
1183 | { | |
937abeaa | 1184 | struct scsi_cmnd *scmd, *bdr_scmd, *next; |
1da177e4 LT |
1185 | struct scsi_device *sdev; |
1186 | int rtn; | |
1187 | ||
1188 | shost_for_each_device(sdev, shost) { | |
1189 | bdr_scmd = NULL; | |
1190 | list_for_each_entry(scmd, work_q, eh_entry) | |
1191 | if (scmd->device == sdev) { | |
1192 | bdr_scmd = scmd; | |
1193 | break; | |
1194 | } | |
1195 | ||
1196 | if (!bdr_scmd) | |
1197 | continue; | |
1198 | ||
1199 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BDR sdev:" | |
1200 | " 0x%p\n", current->comm, | |
1201 | sdev)); | |
1202 | rtn = scsi_try_bus_device_reset(bdr_scmd); | |
2f2eb587 | 1203 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
1da177e4 | 1204 | if (!scsi_device_online(sdev) || |
2f2eb587 | 1205 | rtn == FAST_IO_FAIL || |
1da177e4 | 1206 | !scsi_eh_tur(bdr_scmd)) { |
937abeaa CH |
1207 | list_for_each_entry_safe(scmd, next, |
1208 | work_q, eh_entry) { | |
1da177e4 LT |
1209 | if (scmd->device == sdev) |
1210 | scsi_eh_finish_cmd(scmd, | |
1211 | done_q); | |
1212 | } | |
1213 | } | |
1214 | } else { | |
1215 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BDR" | |
1216 | " failed sdev:" | |
1217 | "0x%p\n", | |
1218 | current->comm, | |
1219 | sdev)); | |
1220 | } | |
1221 | } | |
1222 | ||
1223 | return list_empty(work_q); | |
1224 | } | |
1225 | ||
30bd7df8 MC |
1226 | /** |
1227 | * scsi_eh_target_reset - send target reset if needed | |
1228 | * @shost: scsi host being recovered. | |
1229 | * @work_q: &list_head for pending commands. | |
1230 | * @done_q: &list_head for processed commands. | |
1231 | * | |
1232 | * Notes: | |
1233 | * Try a target reset. | |
1234 | */ | |
1235 | static int scsi_eh_target_reset(struct Scsi_Host *shost, | |
1236 | struct list_head *work_q, | |
1237 | struct list_head *done_q) | |
1238 | { | |
98db5195 | 1239 | LIST_HEAD(tmp_list); |
3eef6257 | 1240 | LIST_HEAD(check_list); |
30bd7df8 | 1241 | |
98db5195 JB |
1242 | list_splice_init(work_q, &tmp_list); |
1243 | ||
1244 | while (!list_empty(&tmp_list)) { | |
1245 | struct scsi_cmnd *next, *scmd; | |
1246 | int rtn; | |
1247 | unsigned int id; | |
1248 | ||
1249 | scmd = list_entry(tmp_list.next, struct scsi_cmnd, eh_entry); | |
1250 | id = scmd_id(scmd); | |
30bd7df8 MC |
1251 | |
1252 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending target reset " | |
1253 | "to target %d\n", | |
1254 | current->comm, id)); | |
98db5195 JB |
1255 | rtn = scsi_try_target_reset(scmd); |
1256 | if (rtn != SUCCESS && rtn != FAST_IO_FAIL) | |
30bd7df8 MC |
1257 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Target reset" |
1258 | " failed target: " | |
1259 | "%d\n", | |
1260 | current->comm, id)); | |
98db5195 JB |
1261 | list_for_each_entry_safe(scmd, next, &tmp_list, eh_entry) { |
1262 | if (scmd_id(scmd) != id) | |
1263 | continue; | |
1264 | ||
3eef6257 DJ |
1265 | if (rtn == SUCCESS) |
1266 | list_move_tail(&scmd->eh_entry, &check_list); | |
1267 | else if (rtn == FAST_IO_FAIL) | |
98db5195 JB |
1268 | scsi_eh_finish_cmd(scmd, done_q); |
1269 | else | |
1270 | /* push back on work queue for further processing */ | |
1271 | list_move(&scmd->eh_entry, work_q); | |
1272 | } | |
1273 | } | |
30bd7df8 | 1274 | |
3eef6257 | 1275 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
30bd7df8 MC |
1276 | } |
1277 | ||
1da177e4 | 1278 | /** |
0bf8c869 | 1279 | * scsi_eh_bus_reset - send a bus reset |
eb44820c RL |
1280 | * @shost: &scsi host being recovered. |
1281 | * @work_q: &list_head for pending commands. | |
1282 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1283 | */ |
1da177e4 LT |
1284 | static int scsi_eh_bus_reset(struct Scsi_Host *shost, |
1285 | struct list_head *work_q, | |
1286 | struct list_head *done_q) | |
1287 | { | |
937abeaa | 1288 | struct scsi_cmnd *scmd, *chan_scmd, *next; |
3eef6257 | 1289 | LIST_HEAD(check_list); |
1da177e4 LT |
1290 | unsigned int channel; |
1291 | int rtn; | |
1292 | ||
1293 | /* | |
1294 | * we really want to loop over the various channels, and do this on | |
1295 | * a channel by channel basis. we should also check to see if any | |
1296 | * of the failed commands are on soft_reset devices, and if so, skip | |
0bf8c869 | 1297 | * the reset. |
1da177e4 LT |
1298 | */ |
1299 | ||
1300 | for (channel = 0; channel <= shost->max_channel; channel++) { | |
1301 | chan_scmd = NULL; | |
1302 | list_for_each_entry(scmd, work_q, eh_entry) { | |
422c0d61 | 1303 | if (channel == scmd_channel(scmd)) { |
1da177e4 LT |
1304 | chan_scmd = scmd; |
1305 | break; | |
1306 | /* | |
1307 | * FIXME add back in some support for | |
1308 | * soft_reset devices. | |
1309 | */ | |
1310 | } | |
1311 | } | |
1312 | ||
1313 | if (!chan_scmd) | |
1314 | continue; | |
1315 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending BRST chan:" | |
1316 | " %d\n", current->comm, | |
1317 | channel)); | |
1318 | rtn = scsi_try_bus_reset(chan_scmd); | |
2f2eb587 | 1319 | if (rtn == SUCCESS || rtn == FAST_IO_FAIL) { |
937abeaa | 1320 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
3eef6257 DJ |
1321 | if (channel == scmd_channel(scmd)) { |
1322 | if (rtn == FAST_IO_FAIL) | |
1da177e4 LT |
1323 | scsi_eh_finish_cmd(scmd, |
1324 | done_q); | |
3eef6257 DJ |
1325 | else |
1326 | list_move_tail(&scmd->eh_entry, | |
1327 | &check_list); | |
1328 | } | |
1da177e4 LT |
1329 | } |
1330 | } else { | |
1331 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: BRST" | |
1332 | " failed chan: %d\n", | |
1333 | current->comm, | |
1334 | channel)); | |
1335 | } | |
1336 | } | |
3eef6257 | 1337 | return scsi_eh_test_devices(&check_list, work_q, done_q, 0); |
1da177e4 LT |
1338 | } |
1339 | ||
1340 | /** | |
0bf8c869 | 1341 | * scsi_eh_host_reset - send a host reset |
1da177e4 LT |
1342 | * @work_q: list_head for processed commands. |
1343 | * @done_q: list_head for processed commands. | |
dc8875e1 | 1344 | */ |
1da177e4 LT |
1345 | static int scsi_eh_host_reset(struct list_head *work_q, |
1346 | struct list_head *done_q) | |
1347 | { | |
937abeaa | 1348 | struct scsi_cmnd *scmd, *next; |
3eef6257 | 1349 | LIST_HEAD(check_list); |
1da177e4 | 1350 | int rtn; |
1da177e4 LT |
1351 | |
1352 | if (!list_empty(work_q)) { | |
1353 | scmd = list_entry(work_q->next, | |
1354 | struct scsi_cmnd, eh_entry); | |
1355 | ||
1356 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: Sending HRST\n" | |
1357 | , current->comm)); | |
1358 | ||
1359 | rtn = scsi_try_host_reset(scmd); | |
3eef6257 DJ |
1360 | if (rtn == SUCCESS) { |
1361 | list_splice_init(work_q, &check_list); | |
1362 | } else if (rtn == FAST_IO_FAIL) { | |
937abeaa | 1363 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
1da177e4 LT |
1364 | scsi_eh_finish_cmd(scmd, done_q); |
1365 | } | |
1366 | } else { | |
1367 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: HRST" | |
1368 | " failed\n", | |
1369 | current->comm)); | |
1370 | } | |
1371 | } | |
3eef6257 | 1372 | return scsi_eh_test_devices(&check_list, work_q, done_q, 1); |
1da177e4 LT |
1373 | } |
1374 | ||
1375 | /** | |
1376 | * scsi_eh_offline_sdevs - offline scsi devices that fail to recover | |
1377 | * @work_q: list_head for processed commands. | |
1378 | * @done_q: list_head for processed commands. | |
dc8875e1 | 1379 | */ |
1da177e4 LT |
1380 | static void scsi_eh_offline_sdevs(struct list_head *work_q, |
1381 | struct list_head *done_q) | |
1382 | { | |
937abeaa | 1383 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1384 | |
937abeaa | 1385 | list_for_each_entry_safe(scmd, next, work_q, eh_entry) { |
31765d7d MW |
1386 | sdev_printk(KERN_INFO, scmd->device, "Device offlined - " |
1387 | "not ready after error recovery\n"); | |
1da177e4 | 1388 | scsi_device_set_state(scmd->device, SDEV_OFFLINE); |
3111b0d1 | 1389 | if (scmd->eh_eflags & SCSI_EH_CANCEL_CMD) { |
1da177e4 LT |
1390 | /* |
1391 | * FIXME: Handle lost cmds. | |
1392 | */ | |
1393 | } | |
1394 | scsi_eh_finish_cmd(scmd, done_q); | |
1395 | } | |
1396 | return; | |
1397 | } | |
1398 | ||
4a27446f MC |
1399 | /** |
1400 | * scsi_noretry_cmd - determinte if command should be failed fast | |
1401 | * @scmd: SCSI cmd to examine. | |
1402 | */ | |
1403 | int scsi_noretry_cmd(struct scsi_cmnd *scmd) | |
1404 | { | |
1405 | switch (host_byte(scmd->result)) { | |
1406 | case DID_OK: | |
1407 | break; | |
1408 | case DID_BUS_BUSY: | |
33659ebb | 1409 | return (scmd->request->cmd_flags & REQ_FAILFAST_TRANSPORT); |
4a27446f | 1410 | case DID_PARITY: |
33659ebb | 1411 | return (scmd->request->cmd_flags & REQ_FAILFAST_DEV); |
4a27446f MC |
1412 | case DID_ERROR: |
1413 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1414 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1415 | return 0; | |
1416 | /* fall through */ | |
1417 | case DID_SOFT_ERROR: | |
33659ebb | 1418 | return (scmd->request->cmd_flags & REQ_FAILFAST_DRIVER); |
4a27446f MC |
1419 | } |
1420 | ||
1421 | switch (status_byte(scmd->result)) { | |
1422 | case CHECK_CONDITION: | |
1423 | /* | |
1424 | * assume caller has checked sense and determinted | |
1425 | * the check condition was retryable. | |
1426 | */ | |
e96f6abe FT |
1427 | if (scmd->request->cmd_flags & REQ_FAILFAST_DEV || |
1428 | scmd->request->cmd_type == REQ_TYPE_BLOCK_PC) | |
1429 | return 1; | |
4a27446f MC |
1430 | } |
1431 | ||
1432 | return 0; | |
1433 | } | |
1434 | ||
1da177e4 LT |
1435 | /** |
1436 | * scsi_decide_disposition - Disposition a cmd on return from LLD. | |
1437 | * @scmd: SCSI cmd to examine. | |
1438 | * | |
1439 | * Notes: | |
1440 | * This is *only* called when we are examining the status after sending | |
1441 | * out the actual data command. any commands that are queued for error | |
1442 | * recovery (e.g. test_unit_ready) do *not* come through here. | |
1443 | * | |
1444 | * When this routine returns failed, it means the error handler thread | |
1445 | * is woken. In cases where the error code indicates an error that | |
1446 | * doesn't require the error handler read (i.e. we don't need to | |
1447 | * abort/reset), this function should return SUCCESS. | |
dc8875e1 | 1448 | */ |
1da177e4 LT |
1449 | int scsi_decide_disposition(struct scsi_cmnd *scmd) |
1450 | { | |
1451 | int rtn; | |
1452 | ||
1453 | /* | |
1454 | * if the device is offline, then we clearly just pass the result back | |
1455 | * up to the top level. | |
1456 | */ | |
1457 | if (!scsi_device_online(scmd->device)) { | |
1458 | SCSI_LOG_ERROR_RECOVERY(5, printk("%s: device offline - report" | |
1459 | " as SUCCESS\n", | |
cadbd4a5 | 1460 | __func__)); |
1da177e4 LT |
1461 | return SUCCESS; |
1462 | } | |
1463 | ||
1464 | /* | |
1465 | * first check the host byte, to see if there is anything in there | |
1466 | * that would indicate what we need to do. | |
1467 | */ | |
1468 | switch (host_byte(scmd->result)) { | |
1469 | case DID_PASSTHROUGH: | |
1470 | /* | |
1471 | * no matter what, pass this through to the upper layer. | |
1472 | * nuke this special code so that it looks like we are saying | |
1473 | * did_ok. | |
1474 | */ | |
1475 | scmd->result &= 0xff00ffff; | |
1476 | return SUCCESS; | |
1477 | case DID_OK: | |
1478 | /* | |
1479 | * looks good. drop through, and check the next byte. | |
1480 | */ | |
1481 | break; | |
1482 | case DID_NO_CONNECT: | |
1483 | case DID_BAD_TARGET: | |
1484 | case DID_ABORT: | |
1485 | /* | |
1486 | * note - this means that we just report the status back | |
1487 | * to the top level driver, not that we actually think | |
1488 | * that it indicates SUCCESS. | |
1489 | */ | |
1490 | return SUCCESS; | |
1491 | /* | |
1492 | * when the low level driver returns did_soft_error, | |
0bf8c869 | 1493 | * it is responsible for keeping an internal retry counter |
1da177e4 LT |
1494 | * in order to avoid endless loops (db) |
1495 | * | |
1496 | * actually this is a bug in this function here. we should | |
1497 | * be mindful of the maximum number of retries specified | |
1498 | * and not get stuck in a loop. | |
1499 | */ | |
1500 | case DID_SOFT_ERROR: | |
1501 | goto maybe_retry; | |
1502 | case DID_IMM_RETRY: | |
1503 | return NEEDS_RETRY; | |
1504 | ||
bf341919 JB |
1505 | case DID_REQUEUE: |
1506 | return ADD_TO_MLQUEUE; | |
a4dfaa6f MC |
1507 | case DID_TRANSPORT_DISRUPTED: |
1508 | /* | |
1509 | * LLD/transport was disrupted during processing of the IO. | |
1510 | * The transport class is now blocked/blocking, | |
1511 | * and the transport will decide what to do with the IO | |
939c2288 MC |
1512 | * based on its timers and recovery capablilities if |
1513 | * there are enough retries. | |
a4dfaa6f | 1514 | */ |
939c2288 | 1515 | goto maybe_retry; |
a4dfaa6f MC |
1516 | case DID_TRANSPORT_FAILFAST: |
1517 | /* | |
1518 | * The transport decided to failfast the IO (most likely | |
1519 | * the fast io fail tmo fired), so send IO directly upwards. | |
1520 | */ | |
1521 | return SUCCESS; | |
1da177e4 LT |
1522 | case DID_ERROR: |
1523 | if (msg_byte(scmd->result) == COMMAND_COMPLETE && | |
1524 | status_byte(scmd->result) == RESERVATION_CONFLICT) | |
1525 | /* | |
1526 | * execute reservation conflict processing code | |
1527 | * lower down | |
1528 | */ | |
1529 | break; | |
1530 | /* fallthrough */ | |
1da177e4 LT |
1531 | case DID_BUS_BUSY: |
1532 | case DID_PARITY: | |
1533 | goto maybe_retry; | |
1534 | case DID_TIME_OUT: | |
1535 | /* | |
1536 | * when we scan the bus, we get timeout messages for | |
1537 | * these commands if there is no device available. | |
1538 | * other hosts report did_no_connect for the same thing. | |
1539 | */ | |
1540 | if ((scmd->cmnd[0] == TEST_UNIT_READY || | |
1541 | scmd->cmnd[0] == INQUIRY)) { | |
1542 | return SUCCESS; | |
1543 | } else { | |
1544 | return FAILED; | |
1545 | } | |
1546 | case DID_RESET: | |
1547 | return SUCCESS; | |
1548 | default: | |
1549 | return FAILED; | |
1550 | } | |
1551 | ||
1552 | /* | |
1553 | * next, check the message byte. | |
1554 | */ | |
1555 | if (msg_byte(scmd->result) != COMMAND_COMPLETE) | |
1556 | return FAILED; | |
1557 | ||
1558 | /* | |
1559 | * check the status byte to see if this indicates anything special. | |
1560 | */ | |
1561 | switch (status_byte(scmd->result)) { | |
1562 | case QUEUE_FULL: | |
42a6a918 | 1563 | scsi_handle_queue_full(scmd->device); |
1da177e4 LT |
1564 | /* |
1565 | * the case of trying to send too many commands to a | |
1566 | * tagged queueing device. | |
1567 | */ | |
1568 | case BUSY: | |
1569 | /* | |
1570 | * device can't talk to us at the moment. Should only | |
1571 | * occur (SAM-3) when the task queue is empty, so will cause | |
1572 | * the empty queue handling to trigger a stall in the | |
1573 | * device. | |
1574 | */ | |
1575 | return ADD_TO_MLQUEUE; | |
1576 | case GOOD: | |
4a84067d | 1577 | scsi_handle_queue_ramp_up(scmd->device); |
1da177e4 | 1578 | case COMMAND_TERMINATED: |
1da177e4 | 1579 | return SUCCESS; |
a9b589d9 VB |
1580 | case TASK_ABORTED: |
1581 | goto maybe_retry; | |
1da177e4 LT |
1582 | case CHECK_CONDITION: |
1583 | rtn = scsi_check_sense(scmd); | |
1584 | if (rtn == NEEDS_RETRY) | |
1585 | goto maybe_retry; | |
1586 | /* if rtn == FAILED, we have no sense information; | |
1587 | * returning FAILED will wake the error handler thread | |
1588 | * to collect the sense and redo the decide | |
1589 | * disposition */ | |
1590 | return rtn; | |
1591 | case CONDITION_GOOD: | |
1592 | case INTERMEDIATE_GOOD: | |
1593 | case INTERMEDIATE_C_GOOD: | |
1594 | case ACA_ACTIVE: | |
1595 | /* | |
1596 | * who knows? FIXME(eric) | |
1597 | */ | |
1598 | return SUCCESS; | |
1599 | ||
1600 | case RESERVATION_CONFLICT: | |
9ccfc756 JB |
1601 | sdev_printk(KERN_INFO, scmd->device, |
1602 | "reservation conflict\n"); | |
2082ebc4 | 1603 | set_host_byte(scmd, DID_NEXUS_FAILURE); |
1da177e4 LT |
1604 | return SUCCESS; /* causes immediate i/o error */ |
1605 | default: | |
1606 | return FAILED; | |
1607 | } | |
1608 | return FAILED; | |
1609 | ||
1610 | maybe_retry: | |
1611 | ||
1612 | /* we requeue for retry because the error was retryable, and | |
1613 | * the request was not marked fast fail. Note that above, | |
1614 | * even if the request is marked fast fail, we still requeue | |
1615 | * for queue congestion conditions (QUEUE_FULL or BUSY) */ | |
8884efab | 1616 | if ((++scmd->retries) <= scmd->allowed |
4a27446f | 1617 | && !scsi_noretry_cmd(scmd)) { |
1da177e4 LT |
1618 | return NEEDS_RETRY; |
1619 | } else { | |
1620 | /* | |
1621 | * no more retries - report this one back to upper level. | |
1622 | */ | |
1623 | return SUCCESS; | |
1624 | } | |
1625 | } | |
1626 | ||
f078727b FT |
1627 | static void eh_lock_door_done(struct request *req, int uptodate) |
1628 | { | |
1629 | __blk_put_request(req->q, req); | |
1630 | } | |
1631 | ||
1da177e4 LT |
1632 | /** |
1633 | * scsi_eh_lock_door - Prevent medium removal for the specified device | |
1634 | * @sdev: SCSI device to prevent medium removal | |
1635 | * | |
1636 | * Locking: | |
91bc31fb | 1637 | * We must be called from process context. |
1da177e4 LT |
1638 | * |
1639 | * Notes: | |
1640 | * We queue up an asynchronous "ALLOW MEDIUM REMOVAL" request on the | |
1641 | * head of the devices request queue, and continue. | |
dc8875e1 | 1642 | */ |
1da177e4 LT |
1643 | static void scsi_eh_lock_door(struct scsi_device *sdev) |
1644 | { | |
f078727b | 1645 | struct request *req; |
1da177e4 | 1646 | |
91bc31fb JB |
1647 | /* |
1648 | * blk_get_request with GFP_KERNEL (__GFP_WAIT) sleeps until a | |
1649 | * request becomes available | |
1650 | */ | |
f078727b | 1651 | req = blk_get_request(sdev->request_queue, READ, GFP_KERNEL); |
1da177e4 | 1652 | |
f078727b FT |
1653 | req->cmd[0] = ALLOW_MEDIUM_REMOVAL; |
1654 | req->cmd[1] = 0; | |
1655 | req->cmd[2] = 0; | |
1656 | req->cmd[3] = 0; | |
1657 | req->cmd[4] = SCSI_REMOVAL_PREVENT; | |
1658 | req->cmd[5] = 0; | |
1da177e4 | 1659 | |
f078727b FT |
1660 | req->cmd_len = COMMAND_SIZE(req->cmd[0]); |
1661 | ||
1662 | req->cmd_type = REQ_TYPE_BLOCK_PC; | |
1663 | req->cmd_flags |= REQ_QUIET; | |
1664 | req->timeout = 10 * HZ; | |
1665 | req->retries = 5; | |
1666 | ||
1667 | blk_execute_rq_nowait(req->q, NULL, req, 1, eh_lock_door_done); | |
1668 | } | |
1da177e4 LT |
1669 | |
1670 | /** | |
1671 | * scsi_restart_operations - restart io operations to the specified host. | |
1672 | * @shost: Host we are restarting. | |
1673 | * | |
1674 | * Notes: | |
1675 | * When we entered the error handler, we blocked all further i/o to | |
1676 | * this device. we need to 'reverse' this process. | |
dc8875e1 | 1677 | */ |
1da177e4 LT |
1678 | static void scsi_restart_operations(struct Scsi_Host *shost) |
1679 | { | |
1680 | struct scsi_device *sdev; | |
939647ee | 1681 | unsigned long flags; |
1da177e4 LT |
1682 | |
1683 | /* | |
1684 | * If the door was locked, we need to insert a door lock request | |
1685 | * onto the head of the SCSI request queue for the device. There | |
1686 | * is no point trying to lock the door of an off-line device. | |
1687 | */ | |
1688 | shost_for_each_device(sdev, shost) { | |
1689 | if (scsi_device_online(sdev) && sdev->locked) | |
1690 | scsi_eh_lock_door(sdev); | |
1691 | } | |
1692 | ||
1693 | /* | |
1694 | * next free up anything directly waiting upon the host. this | |
1695 | * will be requests for character device operations, and also for | |
1696 | * ioctls to queued block devices. | |
1697 | */ | |
1698 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: waking up host to restart\n", | |
cadbd4a5 | 1699 | __func__)); |
1da177e4 | 1700 | |
939647ee JB |
1701 | spin_lock_irqsave(shost->host_lock, flags); |
1702 | if (scsi_host_set_state(shost, SHOST_RUNNING)) | |
1703 | if (scsi_host_set_state(shost, SHOST_CANCEL)) | |
1704 | BUG_ON(scsi_host_set_state(shost, SHOST_DEL)); | |
1705 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
1706 | |
1707 | wake_up(&shost->host_wait); | |
1708 | ||
1709 | /* | |
1710 | * finally we need to re-initiate requests that may be pending. we will | |
1711 | * have had everything blocked while error handling is taking place, and | |
1712 | * now that error recovery is done, we will need to ensure that these | |
1713 | * requests are started. | |
1714 | */ | |
1715 | scsi_run_host_queues(shost); | |
57fc2e33 DW |
1716 | |
1717 | /* | |
1718 | * if eh is active and host_eh_scheduled is pending we need to re-run | |
1719 | * recovery. we do this check after scsi_run_host_queues() to allow | |
1720 | * everything pent up since the last eh run a chance to make forward | |
1721 | * progress before we sync again. Either we'll immediately re-run | |
1722 | * recovery or scsi_device_unbusy() will wake us again when these | |
1723 | * pending commands complete. | |
1724 | */ | |
1725 | spin_lock_irqsave(shost->host_lock, flags); | |
1726 | if (shost->host_eh_scheduled) | |
1727 | if (scsi_host_set_state(shost, SHOST_RECOVERY)) | |
1728 | WARN_ON(scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)); | |
1729 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1da177e4 LT |
1730 | } |
1731 | ||
1732 | /** | |
1733 | * scsi_eh_ready_devs - check device ready state and recover if not. | |
1734 | * @shost: host to be recovered. | |
eb44820c RL |
1735 | * @work_q: &list_head for pending commands. |
1736 | * @done_q: &list_head for processed commands. | |
dc8875e1 | 1737 | */ |
dca84e46 DW |
1738 | void scsi_eh_ready_devs(struct Scsi_Host *shost, |
1739 | struct list_head *work_q, | |
1740 | struct list_head *done_q) | |
1da177e4 LT |
1741 | { |
1742 | if (!scsi_eh_stu(shost, work_q, done_q)) | |
1743 | if (!scsi_eh_bus_device_reset(shost, work_q, done_q)) | |
30bd7df8 MC |
1744 | if (!scsi_eh_target_reset(shost, work_q, done_q)) |
1745 | if (!scsi_eh_bus_reset(shost, work_q, done_q)) | |
1746 | if (!scsi_eh_host_reset(work_q, done_q)) | |
1747 | scsi_eh_offline_sdevs(work_q, | |
1748 | done_q); | |
1da177e4 | 1749 | } |
dca84e46 | 1750 | EXPORT_SYMBOL_GPL(scsi_eh_ready_devs); |
1da177e4 LT |
1751 | |
1752 | /** | |
1753 | * scsi_eh_flush_done_q - finish processed commands or retry them. | |
1754 | * @done_q: list_head of processed commands. | |
dc8875e1 | 1755 | */ |
041c5fc3 | 1756 | void scsi_eh_flush_done_q(struct list_head *done_q) |
1da177e4 | 1757 | { |
937abeaa | 1758 | struct scsi_cmnd *scmd, *next; |
1da177e4 | 1759 | |
937abeaa CH |
1760 | list_for_each_entry_safe(scmd, next, done_q, eh_entry) { |
1761 | list_del_init(&scmd->eh_entry); | |
1da177e4 | 1762 | if (scsi_device_online(scmd->device) && |
4a27446f | 1763 | !scsi_noretry_cmd(scmd) && |
8884efab | 1764 | (++scmd->retries <= scmd->allowed)) { |
1da177e4 LT |
1765 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush" |
1766 | " retry cmd: %p\n", | |
1767 | current->comm, | |
1768 | scmd)); | |
1769 | scsi_queue_insert(scmd, SCSI_MLQUEUE_EH_RETRY); | |
1770 | } else { | |
793698ce PM |
1771 | /* |
1772 | * If just we got sense for the device (called | |
1773 | * scsi_eh_get_sense), scmd->result is already | |
1774 | * set, do not set DRIVER_TIMEOUT. | |
1775 | */ | |
1da177e4 LT |
1776 | if (!scmd->result) |
1777 | scmd->result |= (DRIVER_TIMEOUT << 24); | |
1778 | SCSI_LOG_ERROR_RECOVERY(3, printk("%s: flush finish" | |
1779 | " cmd: %p\n", | |
1780 | current->comm, scmd)); | |
1781 | scsi_finish_command(scmd); | |
1782 | } | |
1783 | } | |
1784 | } | |
041c5fc3 | 1785 | EXPORT_SYMBOL(scsi_eh_flush_done_q); |
1da177e4 LT |
1786 | |
1787 | /** | |
1788 | * scsi_unjam_host - Attempt to fix a host which has a cmd that failed. | |
1789 | * @shost: Host to unjam. | |
1790 | * | |
1791 | * Notes: | |
1792 | * When we come in here, we *know* that all commands on the bus have | |
1793 | * either completed, failed or timed out. we also know that no further | |
1794 | * commands are being sent to the host, so things are relatively quiet | |
1795 | * and we have freedom to fiddle with things as we wish. | |
1796 | * | |
1797 | * This is only the *default* implementation. it is possible for | |
1798 | * individual drivers to supply their own version of this function, and | |
1799 | * if the maintainer wishes to do this, it is strongly suggested that | |
1800 | * this function be taken as a template and modified. this function | |
1801 | * was designed to correctly handle problems for about 95% of the | |
1802 | * different cases out there, and it should always provide at least a | |
1803 | * reasonable amount of error recovery. | |
1804 | * | |
1805 | * Any command marked 'failed' or 'timeout' must eventually have | |
1806 | * scsi_finish_cmd() called for it. we do all of the retry stuff | |
1807 | * here, so when we restart the host after we return it should have an | |
1808 | * empty queue. | |
dc8875e1 | 1809 | */ |
1da177e4 LT |
1810 | static void scsi_unjam_host(struct Scsi_Host *shost) |
1811 | { | |
1812 | unsigned long flags; | |
1813 | LIST_HEAD(eh_work_q); | |
1814 | LIST_HEAD(eh_done_q); | |
1815 | ||
1816 | spin_lock_irqsave(shost->host_lock, flags); | |
1817 | list_splice_init(&shost->eh_cmd_q, &eh_work_q); | |
1818 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1819 | ||
1820 | SCSI_LOG_ERROR_RECOVERY(1, scsi_eh_prt_fail_stats(shost, &eh_work_q)); | |
1821 | ||
1822 | if (!scsi_eh_get_sense(&eh_work_q, &eh_done_q)) | |
1823 | if (!scsi_eh_abort_cmds(&eh_work_q, &eh_done_q)) | |
1824 | scsi_eh_ready_devs(shost, &eh_work_q, &eh_done_q); | |
1825 | ||
1826 | scsi_eh_flush_done_q(&eh_done_q); | |
1827 | } | |
1828 | ||
1829 | /** | |
ad42eb1b | 1830 | * scsi_error_handler - SCSI error handler thread |
1da177e4 LT |
1831 | * @data: Host for which we are running. |
1832 | * | |
1833 | * Notes: | |
ad42eb1b CH |
1834 | * This is the main error handling loop. This is run as a kernel thread |
1835 | * for every SCSI host and handles all error handling activity. | |
dc8875e1 | 1836 | */ |
1da177e4 LT |
1837 | int scsi_error_handler(void *data) |
1838 | { | |
ad42eb1b | 1839 | struct Scsi_Host *shost = data; |
1da177e4 | 1840 | |
1da177e4 | 1841 | /* |
ad42eb1b CH |
1842 | * We use TASK_INTERRUPTIBLE so that the thread is not |
1843 | * counted against the load average as a running process. | |
1844 | * We never actually get interrupted because kthread_run | |
c03264a7 | 1845 | * disables signal delivery for the created thread. |
1da177e4 | 1846 | */ |
3ed7a470 | 1847 | while (!kthread_should_stop()) { |
b9d5c6b7 | 1848 | set_current_state(TASK_INTERRUPTIBLE); |
ee7863bc | 1849 | if ((shost->host_failed == 0 && shost->host_eh_scheduled == 0) || |
3ed7a470 | 1850 | shost->host_failed != shost->host_busy) { |
ad42eb1b CH |
1851 | SCSI_LOG_ERROR_RECOVERY(1, |
1852 | printk("Error handler scsi_eh_%d sleeping\n", | |
1853 | shost->host_no)); | |
3ed7a470 | 1854 | schedule(); |
3ed7a470 JB |
1855 | continue; |
1856 | } | |
1da177e4 | 1857 | |
3ed7a470 | 1858 | __set_current_state(TASK_RUNNING); |
ad42eb1b CH |
1859 | SCSI_LOG_ERROR_RECOVERY(1, |
1860 | printk("Error handler scsi_eh_%d waking up\n", | |
1861 | shost->host_no)); | |
1da177e4 | 1862 | |
1da177e4 LT |
1863 | /* |
1864 | * We have a host that is failing for some reason. Figure out | |
1865 | * what we need to do to get it up and online again (if we can). | |
1866 | * If we fail, we end up taking the thing offline. | |
1867 | */ | |
ae0751ff | 1868 | if (!shost->eh_noresume && scsi_autopm_get_host(shost) != 0) { |
bc4f2401 AS |
1869 | SCSI_LOG_ERROR_RECOVERY(1, |
1870 | printk(KERN_ERR "Error handler scsi_eh_%d " | |
1871 | "unable to autoresume\n", | |
1872 | shost->host_no)); | |
1873 | continue; | |
1874 | } | |
1875 | ||
9227c33d CH |
1876 | if (shost->transportt->eh_strategy_handler) |
1877 | shost->transportt->eh_strategy_handler(shost); | |
1da177e4 LT |
1878 | else |
1879 | scsi_unjam_host(shost); | |
1880 | ||
1da177e4 LT |
1881 | /* |
1882 | * Note - if the above fails completely, the action is to take | |
1883 | * individual devices offline and flush the queue of any | |
1884 | * outstanding requests that may have been pending. When we | |
1885 | * restart, we restart any I/O to any other devices on the bus | |
1886 | * which are still online. | |
1887 | */ | |
1888 | scsi_restart_operations(shost); | |
ae0751ff LM |
1889 | if (!shost->eh_noresume) |
1890 | scsi_autopm_put_host(shost); | |
1da177e4 | 1891 | } |
461a0ffb SR |
1892 | __set_current_state(TASK_RUNNING); |
1893 | ||
ad42eb1b CH |
1894 | SCSI_LOG_ERROR_RECOVERY(1, |
1895 | printk("Error handler scsi_eh_%d exiting\n", shost->host_no)); | |
3ed7a470 | 1896 | shost->ehandler = NULL; |
1da177e4 LT |
1897 | return 0; |
1898 | } | |
1899 | ||
1900 | /* | |
1901 | * Function: scsi_report_bus_reset() | |
1902 | * | |
1903 | * Purpose: Utility function used by low-level drivers to report that | |
1904 | * they have observed a bus reset on the bus being handled. | |
1905 | * | |
1906 | * Arguments: shost - Host in question | |
1907 | * channel - channel on which reset was observed. | |
1908 | * | |
1909 | * Returns: Nothing | |
1910 | * | |
1911 | * Lock status: Host lock must be held. | |
1912 | * | |
1913 | * Notes: This only needs to be called if the reset is one which | |
1914 | * originates from an unknown location. Resets originated | |
1915 | * by the mid-level itself don't need to call this, but there | |
1916 | * should be no harm. | |
1917 | * | |
1918 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
1919 | * is properly treated. | |
1920 | */ | |
1921 | void scsi_report_bus_reset(struct Scsi_Host *shost, int channel) | |
1922 | { | |
1923 | struct scsi_device *sdev; | |
1924 | ||
1925 | __shost_for_each_device(sdev, shost) { | |
30bd7df8 MC |
1926 | if (channel == sdev_channel(sdev)) |
1927 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
1928 | } |
1929 | } | |
1930 | EXPORT_SYMBOL(scsi_report_bus_reset); | |
1931 | ||
1932 | /* | |
1933 | * Function: scsi_report_device_reset() | |
1934 | * | |
1935 | * Purpose: Utility function used by low-level drivers to report that | |
1936 | * they have observed a device reset on the device being handled. | |
1937 | * | |
1938 | * Arguments: shost - Host in question | |
1939 | * channel - channel on which reset was observed | |
1940 | * target - target on which reset was observed | |
1941 | * | |
1942 | * Returns: Nothing | |
1943 | * | |
1944 | * Lock status: Host lock must be held | |
1945 | * | |
1946 | * Notes: This only needs to be called if the reset is one which | |
1947 | * originates from an unknown location. Resets originated | |
1948 | * by the mid-level itself don't need to call this, but there | |
1949 | * should be no harm. | |
1950 | * | |
1951 | * The main purpose of this is to make sure that a CHECK_CONDITION | |
1952 | * is properly treated. | |
1953 | */ | |
1954 | void scsi_report_device_reset(struct Scsi_Host *shost, int channel, int target) | |
1955 | { | |
1956 | struct scsi_device *sdev; | |
1957 | ||
1958 | __shost_for_each_device(sdev, shost) { | |
422c0d61 | 1959 | if (channel == sdev_channel(sdev) && |
30bd7df8 MC |
1960 | target == sdev_id(sdev)) |
1961 | __scsi_report_device_reset(sdev, NULL); | |
1da177e4 LT |
1962 | } |
1963 | } | |
1964 | EXPORT_SYMBOL(scsi_report_device_reset); | |
1965 | ||
1966 | static void | |
1967 | scsi_reset_provider_done_command(struct scsi_cmnd *scmd) | |
1968 | { | |
1969 | } | |
1970 | ||
1971 | /* | |
1972 | * Function: scsi_reset_provider | |
1973 | * | |
1974 | * Purpose: Send requested reset to a bus or device at any phase. | |
1975 | * | |
1976 | * Arguments: device - device to send reset to | |
1977 | * flag - reset type (see scsi.h) | |
1978 | * | |
1979 | * Returns: SUCCESS/FAILURE. | |
1980 | * | |
1981 | * Notes: This is used by the SCSI Generic driver to provide | |
1982 | * Bus/Device reset capability. | |
1983 | */ | |
1984 | int | |
1985 | scsi_reset_provider(struct scsi_device *dev, int flag) | |
1986 | { | |
bc4f2401 | 1987 | struct scsi_cmnd *scmd; |
d7a1bb0a | 1988 | struct Scsi_Host *shost = dev->host; |
1da177e4 | 1989 | struct request req; |
d7a1bb0a | 1990 | unsigned long flags; |
1da177e4 LT |
1991 | int rtn; |
1992 | ||
bc4f2401 AS |
1993 | if (scsi_autopm_get_host(shost) < 0) |
1994 | return FAILED; | |
1995 | ||
1996 | scmd = scsi_get_command(dev, GFP_KERNEL); | |
4f54eec8 | 1997 | blk_rq_init(NULL, &req); |
1da177e4 | 1998 | scmd->request = &req; |
b4edcbca | 1999 | |
64a87b24 BH |
2000 | scmd->cmnd = req.cmd; |
2001 | ||
1da177e4 | 2002 | scmd->scsi_done = scsi_reset_provider_done_command; |
30b0c37b | 2003 | memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |
1da177e4 LT |
2004 | |
2005 | scmd->cmd_len = 0; | |
2006 | ||
2007 | scmd->sc_data_direction = DMA_BIDIRECTIONAL; | |
1da177e4 | 2008 | |
d7a1bb0a JS |
2009 | spin_lock_irqsave(shost->host_lock, flags); |
2010 | shost->tmf_in_progress = 1; | |
2011 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2012 | ||
1da177e4 LT |
2013 | switch (flag) { |
2014 | case SCSI_TRY_RESET_DEVICE: | |
2015 | rtn = scsi_try_bus_device_reset(scmd); | |
2016 | if (rtn == SUCCESS) | |
2017 | break; | |
2018 | /* FALLTHROUGH */ | |
30bd7df8 MC |
2019 | case SCSI_TRY_RESET_TARGET: |
2020 | rtn = scsi_try_target_reset(scmd); | |
2021 | if (rtn == SUCCESS) | |
2022 | break; | |
2023 | /* FALLTHROUGH */ | |
1da177e4 LT |
2024 | case SCSI_TRY_RESET_BUS: |
2025 | rtn = scsi_try_bus_reset(scmd); | |
2026 | if (rtn == SUCCESS) | |
2027 | break; | |
2028 | /* FALLTHROUGH */ | |
2029 | case SCSI_TRY_RESET_HOST: | |
2030 | rtn = scsi_try_host_reset(scmd); | |
2031 | break; | |
2032 | default: | |
2033 | rtn = FAILED; | |
2034 | } | |
2035 | ||
d7a1bb0a JS |
2036 | spin_lock_irqsave(shost->host_lock, flags); |
2037 | shost->tmf_in_progress = 0; | |
2038 | spin_unlock_irqrestore(shost->host_lock, flags); | |
2039 | ||
2040 | /* | |
2041 | * be sure to wake up anyone who was sleeping or had their queue | |
2042 | * suspended while we performed the TMF. | |
2043 | */ | |
2044 | SCSI_LOG_ERROR_RECOVERY(3, | |
2045 | printk("%s: waking up host to restart after TMF\n", | |
cadbd4a5 | 2046 | __func__)); |
d7a1bb0a JS |
2047 | |
2048 | wake_up(&shost->host_wait); | |
2049 | ||
2050 | scsi_run_host_queues(shost); | |
2051 | ||
1da177e4 | 2052 | scsi_next_command(scmd); |
bc4f2401 | 2053 | scsi_autopm_put_host(shost); |
1da177e4 LT |
2054 | return rtn; |
2055 | } | |
2056 | EXPORT_SYMBOL(scsi_reset_provider); | |
2057 | ||
2058 | /** | |
2059 | * scsi_normalize_sense - normalize main elements from either fixed or | |
2060 | * descriptor sense data format into a common format. | |
2061 | * | |
2062 | * @sense_buffer: byte array containing sense data returned by device | |
2063 | * @sb_len: number of valid bytes in sense_buffer | |
2064 | * @sshdr: pointer to instance of structure that common | |
2065 | * elements are written to. | |
2066 | * | |
2067 | * Notes: | |
2068 | * The "main elements" from sense data are: response_code, sense_key, | |
2069 | * asc, ascq and additional_length (only for descriptor format). | |
2070 | * | |
2071 | * Typically this function can be called after a device has | |
2072 | * responded to a SCSI command with the CHECK_CONDITION status. | |
2073 | * | |
2074 | * Return value: | |
2075 | * 1 if valid sense data information found, else 0; | |
dc8875e1 | 2076 | */ |
1da177e4 LT |
2077 | int scsi_normalize_sense(const u8 *sense_buffer, int sb_len, |
2078 | struct scsi_sense_hdr *sshdr) | |
2079 | { | |
33aa687d | 2080 | if (!sense_buffer || !sb_len) |
1da177e4 LT |
2081 | return 0; |
2082 | ||
2083 | memset(sshdr, 0, sizeof(struct scsi_sense_hdr)); | |
2084 | ||
2085 | sshdr->response_code = (sense_buffer[0] & 0x7f); | |
33aa687d JB |
2086 | |
2087 | if (!scsi_sense_valid(sshdr)) | |
2088 | return 0; | |
2089 | ||
1da177e4 LT |
2090 | if (sshdr->response_code >= 0x72) { |
2091 | /* | |
2092 | * descriptor format | |
2093 | */ | |
2094 | if (sb_len > 1) | |
2095 | sshdr->sense_key = (sense_buffer[1] & 0xf); | |
2096 | if (sb_len > 2) | |
2097 | sshdr->asc = sense_buffer[2]; | |
2098 | if (sb_len > 3) | |
2099 | sshdr->ascq = sense_buffer[3]; | |
2100 | if (sb_len > 7) | |
2101 | sshdr->additional_length = sense_buffer[7]; | |
2102 | } else { | |
0bf8c869 | 2103 | /* |
1da177e4 LT |
2104 | * fixed format |
2105 | */ | |
2106 | if (sb_len > 2) | |
2107 | sshdr->sense_key = (sense_buffer[2] & 0xf); | |
2108 | if (sb_len > 7) { | |
2109 | sb_len = (sb_len < (sense_buffer[7] + 8)) ? | |
2110 | sb_len : (sense_buffer[7] + 8); | |
2111 | if (sb_len > 12) | |
2112 | sshdr->asc = sense_buffer[12]; | |
2113 | if (sb_len > 13) | |
2114 | sshdr->ascq = sense_buffer[13]; | |
2115 | } | |
2116 | } | |
2117 | ||
2118 | return 1; | |
2119 | } | |
2120 | EXPORT_SYMBOL(scsi_normalize_sense); | |
2121 | ||
1da177e4 LT |
2122 | int scsi_command_normalize_sense(struct scsi_cmnd *cmd, |
2123 | struct scsi_sense_hdr *sshdr) | |
2124 | { | |
2125 | return scsi_normalize_sense(cmd->sense_buffer, | |
b80ca4f7 | 2126 | SCSI_SENSE_BUFFERSIZE, sshdr); |
1da177e4 LT |
2127 | } |
2128 | EXPORT_SYMBOL(scsi_command_normalize_sense); | |
2129 | ||
2130 | /** | |
eb44820c | 2131 | * scsi_sense_desc_find - search for a given descriptor type in descriptor sense data format. |
1da177e4 LT |
2132 | * @sense_buffer: byte array of descriptor format sense data |
2133 | * @sb_len: number of valid bytes in sense_buffer | |
2134 | * @desc_type: value of descriptor type to find | |
2135 | * (e.g. 0 -> information) | |
2136 | * | |
2137 | * Notes: | |
2138 | * only valid when sense data is in descriptor format | |
2139 | * | |
2140 | * Return value: | |
2141 | * pointer to start of (first) descriptor if found else NULL | |
dc8875e1 | 2142 | */ |
1da177e4 LT |
2143 | const u8 * scsi_sense_desc_find(const u8 * sense_buffer, int sb_len, |
2144 | int desc_type) | |
2145 | { | |
2146 | int add_sen_len, add_len, desc_len, k; | |
2147 | const u8 * descp; | |
2148 | ||
2149 | if ((sb_len < 8) || (0 == (add_sen_len = sense_buffer[7]))) | |
2150 | return NULL; | |
2151 | if ((sense_buffer[0] < 0x72) || (sense_buffer[0] > 0x73)) | |
2152 | return NULL; | |
2153 | add_sen_len = (add_sen_len < (sb_len - 8)) ? | |
2154 | add_sen_len : (sb_len - 8); | |
2155 | descp = &sense_buffer[8]; | |
2156 | for (desc_len = 0, k = 0; k < add_sen_len; k += desc_len) { | |
2157 | descp += desc_len; | |
2158 | add_len = (k < (add_sen_len - 1)) ? descp[1]: -1; | |
2159 | desc_len = add_len + 2; | |
2160 | if (descp[0] == desc_type) | |
2161 | return descp; | |
2162 | if (add_len < 0) // short descriptor ?? | |
2163 | break; | |
2164 | } | |
2165 | return NULL; | |
2166 | } | |
2167 | EXPORT_SYMBOL(scsi_sense_desc_find); | |
2168 | ||
2169 | /** | |
eb44820c | 2170 | * scsi_get_sense_info_fld - get information field from sense data (either fixed or descriptor format) |
1da177e4 LT |
2171 | * @sense_buffer: byte array of sense data |
2172 | * @sb_len: number of valid bytes in sense_buffer | |
2173 | * @info_out: pointer to 64 integer where 8 or 4 byte information | |
2174 | * field will be placed if found. | |
2175 | * | |
2176 | * Return value: | |
2177 | * 1 if information field found, 0 if not found. | |
dc8875e1 | 2178 | */ |
1da177e4 LT |
2179 | int scsi_get_sense_info_fld(const u8 * sense_buffer, int sb_len, |
2180 | u64 * info_out) | |
2181 | { | |
2182 | int j; | |
2183 | const u8 * ucp; | |
2184 | u64 ull; | |
2185 | ||
2186 | if (sb_len < 7) | |
2187 | return 0; | |
2188 | switch (sense_buffer[0] & 0x7f) { | |
2189 | case 0x70: | |
2190 | case 0x71: | |
2191 | if (sense_buffer[0] & 0x80) { | |
2192 | *info_out = (sense_buffer[3] << 24) + | |
2193 | (sense_buffer[4] << 16) + | |
2194 | (sense_buffer[5] << 8) + sense_buffer[6]; | |
2195 | return 1; | |
2196 | } else | |
2197 | return 0; | |
2198 | case 0x72: | |
2199 | case 0x73: | |
2200 | ucp = scsi_sense_desc_find(sense_buffer, sb_len, | |
2201 | 0 /* info desc */); | |
2202 | if (ucp && (0xa == ucp[1])) { | |
2203 | ull = 0; | |
2204 | for (j = 0; j < 8; ++j) { | |
2205 | if (j > 0) | |
2206 | ull <<= 8; | |
2207 | ull |= ucp[4 + j]; | |
2208 | } | |
2209 | *info_out = ull; | |
2210 | return 1; | |
2211 | } else | |
2212 | return 0; | |
2213 | default: | |
2214 | return 0; | |
2215 | } | |
2216 | } | |
2217 | EXPORT_SYMBOL(scsi_get_sense_info_fld); | |
3bc6a261 FT |
2218 | |
2219 | /** | |
2220 | * scsi_build_sense_buffer - build sense data in a buffer | |
2221 | * @desc: Sense format (non zero == descriptor format, | |
2222 | * 0 == fixed format) | |
2223 | * @buf: Where to build sense data | |
2224 | * @key: Sense key | |
2225 | * @asc: Additional sense code | |
2226 | * @ascq: Additional sense code qualifier | |
2227 | * | |
2228 | **/ | |
2229 | void scsi_build_sense_buffer(int desc, u8 *buf, u8 key, u8 asc, u8 ascq) | |
2230 | { | |
2231 | if (desc) { | |
2232 | buf[0] = 0x72; /* descriptor, current */ | |
2233 | buf[1] = key; | |
2234 | buf[2] = asc; | |
2235 | buf[3] = ascq; | |
2236 | buf[7] = 0; | |
2237 | } else { | |
2238 | buf[0] = 0x70; /* fixed, current */ | |
2239 | buf[2] = key; | |
2240 | buf[7] = 0xa; | |
2241 | buf[12] = asc; | |
2242 | buf[13] = ascq; | |
2243 | } | |
2244 | } | |
2245 | EXPORT_SYMBOL(scsi_build_sense_buffer); |