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ece1d636 TH |
1 | /* |
2 | * libata-eh.c - libata error handling | |
3 | * | |
4 | * Maintained by: Jeff Garzik <jgarzik@pobox.com> | |
5 | * Please ALWAYS copy linux-ide@vger.kernel.org | |
6 | * on emails. | |
7 | * | |
8 | * Copyright 2006 Tejun Heo <htejun@gmail.com> | |
9 | * | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License as | |
13 | * published by the Free Software Foundation; either version 2, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
19 | * General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; see the file COPYING. If not, write to | |
23 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, | |
24 | * USA. | |
25 | * | |
26 | * | |
27 | * libata documentation is available via 'make {ps|pdf}docs', | |
28 | * as Documentation/DocBook/libata.* | |
29 | * | |
30 | * Hardware documentation available from http://www.t13.org/ and | |
31 | * http://www.sata-io.org/ | |
32 | * | |
33 | */ | |
34 | ||
35 | #include <linux/config.h> | |
36 | #include <linux/kernel.h> | |
37 | #include <scsi/scsi.h> | |
38 | #include <scsi/scsi_host.h> | |
39 | #include <scsi/scsi_eh.h> | |
40 | #include <scsi/scsi_device.h> | |
41 | #include <scsi/scsi_cmnd.h> | |
42 | ||
43 | #include <linux/libata.h> | |
44 | ||
45 | #include "libata.h" | |
46 | ||
ad9e2762 TH |
47 | static void __ata_port_freeze(struct ata_port *ap); |
48 | ||
0c247c55 TH |
49 | static void ata_ering_record(struct ata_ering *ering, int is_io, |
50 | unsigned int err_mask) | |
51 | { | |
52 | struct ata_ering_entry *ent; | |
53 | ||
54 | WARN_ON(!err_mask); | |
55 | ||
56 | ering->cursor++; | |
57 | ering->cursor %= ATA_ERING_SIZE; | |
58 | ||
59 | ent = &ering->ring[ering->cursor]; | |
60 | ent->is_io = is_io; | |
61 | ent->err_mask = err_mask; | |
62 | ent->timestamp = get_jiffies_64(); | |
63 | } | |
64 | ||
65 | static struct ata_ering_entry * ata_ering_top(struct ata_ering *ering) | |
66 | { | |
67 | struct ata_ering_entry *ent = &ering->ring[ering->cursor]; | |
68 | if (!ent->err_mask) | |
69 | return NULL; | |
70 | return ent; | |
71 | } | |
72 | ||
73 | static int ata_ering_map(struct ata_ering *ering, | |
74 | int (*map_fn)(struct ata_ering_entry *, void *), | |
75 | void *arg) | |
76 | { | |
77 | int idx, rc = 0; | |
78 | struct ata_ering_entry *ent; | |
79 | ||
80 | idx = ering->cursor; | |
81 | do { | |
82 | ent = &ering->ring[idx]; | |
83 | if (!ent->err_mask) | |
84 | break; | |
85 | rc = map_fn(ent, arg); | |
86 | if (rc) | |
87 | break; | |
88 | idx = (idx - 1 + ATA_ERING_SIZE) % ATA_ERING_SIZE; | |
89 | } while (idx != ering->cursor); | |
90 | ||
91 | return rc; | |
92 | } | |
93 | ||
ece1d636 TH |
94 | /** |
95 | * ata_scsi_timed_out - SCSI layer time out callback | |
96 | * @cmd: timed out SCSI command | |
97 | * | |
98 | * Handles SCSI layer timeout. We race with normal completion of | |
99 | * the qc for @cmd. If the qc is already gone, we lose and let | |
100 | * the scsi command finish (EH_HANDLED). Otherwise, the qc has | |
101 | * timed out and EH should be invoked. Prevent ata_qc_complete() | |
102 | * from finishing it by setting EH_SCHEDULED and return | |
103 | * EH_NOT_HANDLED. | |
104 | * | |
ad9e2762 TH |
105 | * TODO: kill this function once old EH is gone. |
106 | * | |
ece1d636 TH |
107 | * LOCKING: |
108 | * Called from timer context | |
109 | * | |
110 | * RETURNS: | |
111 | * EH_HANDLED or EH_NOT_HANDLED | |
112 | */ | |
113 | enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd) | |
114 | { | |
115 | struct Scsi_Host *host = cmd->device->host; | |
35bb94b1 | 116 | struct ata_port *ap = ata_shost_to_port(host); |
ece1d636 TH |
117 | unsigned long flags; |
118 | struct ata_queued_cmd *qc; | |
ad9e2762 | 119 | enum scsi_eh_timer_return ret; |
ece1d636 TH |
120 | |
121 | DPRINTK("ENTER\n"); | |
122 | ||
ad9e2762 TH |
123 | if (ap->ops->error_handler) { |
124 | ret = EH_NOT_HANDLED; | |
125 | goto out; | |
126 | } | |
127 | ||
128 | ret = EH_HANDLED; | |
ece1d636 TH |
129 | spin_lock_irqsave(&ap->host_set->lock, flags); |
130 | qc = ata_qc_from_tag(ap, ap->active_tag); | |
131 | if (qc) { | |
132 | WARN_ON(qc->scsicmd != cmd); | |
133 | qc->flags |= ATA_QCFLAG_EH_SCHEDULED; | |
134 | qc->err_mask |= AC_ERR_TIMEOUT; | |
135 | ret = EH_NOT_HANDLED; | |
136 | } | |
137 | spin_unlock_irqrestore(&ap->host_set->lock, flags); | |
138 | ||
ad9e2762 | 139 | out: |
ece1d636 TH |
140 | DPRINTK("EXIT, ret=%d\n", ret); |
141 | return ret; | |
142 | } | |
143 | ||
144 | /** | |
145 | * ata_scsi_error - SCSI layer error handler callback | |
146 | * @host: SCSI host on which error occurred | |
147 | * | |
148 | * Handles SCSI-layer-thrown error events. | |
149 | * | |
150 | * LOCKING: | |
151 | * Inherited from SCSI layer (none, can sleep) | |
152 | * | |
153 | * RETURNS: | |
154 | * Zero. | |
155 | */ | |
381544bb | 156 | void ata_scsi_error(struct Scsi_Host *host) |
ece1d636 | 157 | { |
35bb94b1 | 158 | struct ata_port *ap = ata_shost_to_port(host); |
ad9e2762 TH |
159 | spinlock_t *hs_lock = &ap->host_set->lock; |
160 | int i, repeat_cnt = ATA_EH_MAX_REPEAT; | |
161 | unsigned long flags; | |
ece1d636 TH |
162 | |
163 | DPRINTK("ENTER\n"); | |
164 | ||
ad9e2762 | 165 | /* synchronize with port task */ |
ece1d636 TH |
166 | ata_port_flush_task(ap); |
167 | ||
ad9e2762 TH |
168 | /* synchronize with host_set lock and sort out timeouts */ |
169 | ||
170 | /* For new EH, all qcs are finished in one of three ways - | |
171 | * normal completion, error completion, and SCSI timeout. | |
172 | * Both cmpletions can race against SCSI timeout. When normal | |
173 | * completion wins, the qc never reaches EH. When error | |
174 | * completion wins, the qc has ATA_QCFLAG_FAILED set. | |
175 | * | |
176 | * When SCSI timeout wins, things are a bit more complex. | |
177 | * Normal or error completion can occur after the timeout but | |
178 | * before this point. In such cases, both types of | |
179 | * completions are honored. A scmd is determined to have | |
180 | * timed out iff its associated qc is active and not failed. | |
181 | */ | |
182 | if (ap->ops->error_handler) { | |
183 | struct scsi_cmnd *scmd, *tmp; | |
184 | int nr_timedout = 0; | |
185 | ||
186 | spin_lock_irqsave(hs_lock, flags); | |
187 | ||
188 | list_for_each_entry_safe(scmd, tmp, &host->eh_cmd_q, eh_entry) { | |
189 | struct ata_queued_cmd *qc; | |
190 | ||
191 | for (i = 0; i < ATA_MAX_QUEUE; i++) { | |
192 | qc = __ata_qc_from_tag(ap, i); | |
193 | if (qc->flags & ATA_QCFLAG_ACTIVE && | |
194 | qc->scsicmd == scmd) | |
195 | break; | |
196 | } | |
197 | ||
198 | if (i < ATA_MAX_QUEUE) { | |
199 | /* the scmd has an associated qc */ | |
200 | if (!(qc->flags & ATA_QCFLAG_FAILED)) { | |
201 | /* which hasn't failed yet, timeout */ | |
202 | qc->err_mask |= AC_ERR_TIMEOUT; | |
203 | qc->flags |= ATA_QCFLAG_FAILED; | |
204 | nr_timedout++; | |
205 | } | |
206 | } else { | |
207 | /* Normal completion occurred after | |
208 | * SCSI timeout but before this point. | |
209 | * Successfully complete it. | |
210 | */ | |
211 | scmd->retries = scmd->allowed; | |
212 | scsi_eh_finish_cmd(scmd, &ap->eh_done_q); | |
213 | } | |
214 | } | |
215 | ||
216 | /* If we have timed out qcs. They belong to EH from | |
217 | * this point but the state of the controller is | |
218 | * unknown. Freeze the port to make sure the IRQ | |
219 | * handler doesn't diddle with those qcs. This must | |
220 | * be done atomically w.r.t. setting QCFLAG_FAILED. | |
221 | */ | |
222 | if (nr_timedout) | |
223 | __ata_port_freeze(ap); | |
224 | ||
225 | spin_unlock_irqrestore(hs_lock, flags); | |
226 | } else | |
227 | spin_unlock_wait(hs_lock); | |
228 | ||
229 | repeat: | |
230 | /* invoke error handler */ | |
231 | if (ap->ops->error_handler) { | |
f3e81b19 | 232 | /* fetch & clear EH info */ |
ad9e2762 | 233 | spin_lock_irqsave(hs_lock, flags); |
f3e81b19 TH |
234 | |
235 | memset(&ap->eh_context, 0, sizeof(ap->eh_context)); | |
236 | ap->eh_context.i = ap->eh_info; | |
237 | memset(&ap->eh_info, 0, sizeof(ap->eh_info)); | |
238 | ||
ad9e2762 | 239 | ap->flags &= ~ATA_FLAG_EH_PENDING; |
f3e81b19 | 240 | |
ad9e2762 TH |
241 | spin_unlock_irqrestore(hs_lock, flags); |
242 | ||
243 | /* invoke EH */ | |
244 | ap->ops->error_handler(ap); | |
245 | ||
246 | /* Exception might have happend after ->error_handler | |
247 | * recovered the port but before this point. Repeat | |
248 | * EH in such case. | |
249 | */ | |
250 | spin_lock_irqsave(hs_lock, flags); | |
251 | ||
252 | if (ap->flags & ATA_FLAG_EH_PENDING) { | |
253 | if (--repeat_cnt) { | |
254 | ata_port_printk(ap, KERN_INFO, | |
255 | "EH pending after completion, " | |
256 | "repeating EH (cnt=%d)\n", repeat_cnt); | |
257 | spin_unlock_irqrestore(hs_lock, flags); | |
258 | goto repeat; | |
259 | } | |
260 | ata_port_printk(ap, KERN_ERR, "EH pending after %d " | |
261 | "tries, giving up\n", ATA_EH_MAX_REPEAT); | |
262 | } | |
263 | ||
f3e81b19 TH |
264 | /* this run is complete, make sure EH info is clear */ |
265 | memset(&ap->eh_info, 0, sizeof(ap->eh_info)); | |
266 | ||
ad9e2762 TH |
267 | /* Clear host_eh_scheduled while holding hs_lock such |
268 | * that if exception occurs after this point but | |
269 | * before EH completion, SCSI midlayer will | |
270 | * re-initiate EH. | |
271 | */ | |
272 | host->host_eh_scheduled = 0; | |
273 | ||
274 | spin_unlock_irqrestore(hs_lock, flags); | |
275 | } else { | |
276 | WARN_ON(ata_qc_from_tag(ap, ap->active_tag) == NULL); | |
277 | ap->ops->eng_timeout(ap); | |
278 | } | |
ece1d636 | 279 | |
ad9e2762 | 280 | /* finish or retry handled scmd's and clean up */ |
ece1d636 TH |
281 | WARN_ON(host->host_failed || !list_empty(&host->eh_cmd_q)); |
282 | ||
283 | scsi_eh_flush_done_q(&ap->eh_done_q); | |
284 | ||
ad9e2762 TH |
285 | /* clean up */ |
286 | spin_lock_irqsave(hs_lock, flags); | |
287 | ||
288 | if (ap->flags & ATA_FLAG_RECOVERED) | |
289 | ata_port_printk(ap, KERN_INFO, "EH complete\n"); | |
290 | ap->flags &= ~ATA_FLAG_RECOVERED; | |
291 | ||
292 | spin_unlock_irqrestore(hs_lock, flags); | |
293 | ||
ece1d636 | 294 | DPRINTK("EXIT\n"); |
ece1d636 TH |
295 | } |
296 | ||
297 | /** | |
298 | * ata_qc_timeout - Handle timeout of queued command | |
299 | * @qc: Command that timed out | |
300 | * | |
301 | * Some part of the kernel (currently, only the SCSI layer) | |
302 | * has noticed that the active command on port @ap has not | |
303 | * completed after a specified length of time. Handle this | |
304 | * condition by disabling DMA (if necessary) and completing | |
305 | * transactions, with error if necessary. | |
306 | * | |
307 | * This also handles the case of the "lost interrupt", where | |
308 | * for some reason (possibly hardware bug, possibly driver bug) | |
309 | * an interrupt was not delivered to the driver, even though the | |
310 | * transaction completed successfully. | |
311 | * | |
ad9e2762 TH |
312 | * TODO: kill this function once old EH is gone. |
313 | * | |
ece1d636 TH |
314 | * LOCKING: |
315 | * Inherited from SCSI layer (none, can sleep) | |
316 | */ | |
317 | static void ata_qc_timeout(struct ata_queued_cmd *qc) | |
318 | { | |
319 | struct ata_port *ap = qc->ap; | |
320 | struct ata_host_set *host_set = ap->host_set; | |
321 | u8 host_stat = 0, drv_stat; | |
322 | unsigned long flags; | |
323 | ||
324 | DPRINTK("ENTER\n"); | |
325 | ||
326 | ap->hsm_task_state = HSM_ST_IDLE; | |
327 | ||
328 | spin_lock_irqsave(&host_set->lock, flags); | |
329 | ||
330 | switch (qc->tf.protocol) { | |
331 | ||
332 | case ATA_PROT_DMA: | |
333 | case ATA_PROT_ATAPI_DMA: | |
334 | host_stat = ap->ops->bmdma_status(ap); | |
335 | ||
336 | /* before we do anything else, clear DMA-Start bit */ | |
337 | ap->ops->bmdma_stop(qc); | |
338 | ||
339 | /* fall through */ | |
340 | ||
341 | default: | |
342 | ata_altstatus(ap); | |
343 | drv_stat = ata_chk_status(ap); | |
344 | ||
345 | /* ack bmdma irq events */ | |
346 | ap->ops->irq_clear(ap); | |
347 | ||
f15a1daf TH |
348 | ata_dev_printk(qc->dev, KERN_ERR, "command 0x%x timeout, " |
349 | "stat 0x%x host_stat 0x%x\n", | |
350 | qc->tf.command, drv_stat, host_stat); | |
ece1d636 TH |
351 | |
352 | /* complete taskfile transaction */ | |
c13b56a1 | 353 | qc->err_mask |= AC_ERR_TIMEOUT; |
ece1d636 TH |
354 | break; |
355 | } | |
356 | ||
357 | spin_unlock_irqrestore(&host_set->lock, flags); | |
358 | ||
359 | ata_eh_qc_complete(qc); | |
360 | ||
361 | DPRINTK("EXIT\n"); | |
362 | } | |
363 | ||
364 | /** | |
365 | * ata_eng_timeout - Handle timeout of queued command | |
366 | * @ap: Port on which timed-out command is active | |
367 | * | |
368 | * Some part of the kernel (currently, only the SCSI layer) | |
369 | * has noticed that the active command on port @ap has not | |
370 | * completed after a specified length of time. Handle this | |
371 | * condition by disabling DMA (if necessary) and completing | |
372 | * transactions, with error if necessary. | |
373 | * | |
374 | * This also handles the case of the "lost interrupt", where | |
375 | * for some reason (possibly hardware bug, possibly driver bug) | |
376 | * an interrupt was not delivered to the driver, even though the | |
377 | * transaction completed successfully. | |
378 | * | |
ad9e2762 TH |
379 | * TODO: kill this function once old EH is gone. |
380 | * | |
ece1d636 TH |
381 | * LOCKING: |
382 | * Inherited from SCSI layer (none, can sleep) | |
383 | */ | |
384 | void ata_eng_timeout(struct ata_port *ap) | |
385 | { | |
386 | DPRINTK("ENTER\n"); | |
387 | ||
388 | ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag)); | |
389 | ||
390 | DPRINTK("EXIT\n"); | |
391 | } | |
392 | ||
f686bcb8 TH |
393 | /** |
394 | * ata_qc_schedule_eh - schedule qc for error handling | |
395 | * @qc: command to schedule error handling for | |
396 | * | |
397 | * Schedule error handling for @qc. EH will kick in as soon as | |
398 | * other commands are drained. | |
399 | * | |
400 | * LOCKING: | |
401 | * spin_lock_irqsave(host_set lock) | |
402 | */ | |
403 | void ata_qc_schedule_eh(struct ata_queued_cmd *qc) | |
404 | { | |
405 | struct ata_port *ap = qc->ap; | |
406 | ||
407 | WARN_ON(!ap->ops->error_handler); | |
408 | ||
409 | qc->flags |= ATA_QCFLAG_FAILED; | |
410 | qc->ap->flags |= ATA_FLAG_EH_PENDING; | |
411 | ||
412 | /* The following will fail if timeout has already expired. | |
413 | * ata_scsi_error() takes care of such scmds on EH entry. | |
414 | * Note that ATA_QCFLAG_FAILED is unconditionally set after | |
415 | * this function completes. | |
416 | */ | |
417 | scsi_req_abort_cmd(qc->scsicmd); | |
418 | } | |
419 | ||
7b70fc03 TH |
420 | /** |
421 | * ata_port_schedule_eh - schedule error handling without a qc | |
422 | * @ap: ATA port to schedule EH for | |
423 | * | |
424 | * Schedule error handling for @ap. EH will kick in as soon as | |
425 | * all commands are drained. | |
426 | * | |
427 | * LOCKING: | |
428 | * spin_lock_irqsave(host_set lock) | |
429 | */ | |
430 | void ata_port_schedule_eh(struct ata_port *ap) | |
431 | { | |
432 | WARN_ON(!ap->ops->error_handler); | |
433 | ||
434 | ap->flags |= ATA_FLAG_EH_PENDING; | |
435 | ata_schedule_scsi_eh(ap->host); | |
436 | ||
437 | DPRINTK("port EH scheduled\n"); | |
438 | } | |
439 | ||
440 | /** | |
441 | * ata_port_abort - abort all qc's on the port | |
442 | * @ap: ATA port to abort qc's for | |
443 | * | |
444 | * Abort all active qc's of @ap and schedule EH. | |
445 | * | |
446 | * LOCKING: | |
447 | * spin_lock_irqsave(host_set lock) | |
448 | * | |
449 | * RETURNS: | |
450 | * Number of aborted qc's. | |
451 | */ | |
452 | int ata_port_abort(struct ata_port *ap) | |
453 | { | |
454 | int tag, nr_aborted = 0; | |
455 | ||
456 | WARN_ON(!ap->ops->error_handler); | |
457 | ||
458 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
459 | struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag); | |
460 | ||
461 | if (qc) { | |
462 | qc->flags |= ATA_QCFLAG_FAILED; | |
463 | ata_qc_complete(qc); | |
464 | nr_aborted++; | |
465 | } | |
466 | } | |
467 | ||
468 | if (!nr_aborted) | |
469 | ata_port_schedule_eh(ap); | |
470 | ||
471 | return nr_aborted; | |
472 | } | |
473 | ||
e3180499 TH |
474 | /** |
475 | * __ata_port_freeze - freeze port | |
476 | * @ap: ATA port to freeze | |
477 | * | |
478 | * This function is called when HSM violation or some other | |
479 | * condition disrupts normal operation of the port. Frozen port | |
480 | * is not allowed to perform any operation until the port is | |
481 | * thawed, which usually follows a successful reset. | |
482 | * | |
483 | * ap->ops->freeze() callback can be used for freezing the port | |
484 | * hardware-wise (e.g. mask interrupt and stop DMA engine). If a | |
485 | * port cannot be frozen hardware-wise, the interrupt handler | |
486 | * must ack and clear interrupts unconditionally while the port | |
487 | * is frozen. | |
488 | * | |
489 | * LOCKING: | |
490 | * spin_lock_irqsave(host_set lock) | |
491 | */ | |
492 | static void __ata_port_freeze(struct ata_port *ap) | |
493 | { | |
494 | WARN_ON(!ap->ops->error_handler); | |
495 | ||
496 | if (ap->ops->freeze) | |
497 | ap->ops->freeze(ap); | |
498 | ||
499 | ap->flags |= ATA_FLAG_FROZEN; | |
500 | ||
501 | DPRINTK("ata%u port frozen\n", ap->id); | |
502 | } | |
503 | ||
504 | /** | |
505 | * ata_port_freeze - abort & freeze port | |
506 | * @ap: ATA port to freeze | |
507 | * | |
508 | * Abort and freeze @ap. | |
509 | * | |
510 | * LOCKING: | |
511 | * spin_lock_irqsave(host_set lock) | |
512 | * | |
513 | * RETURNS: | |
514 | * Number of aborted commands. | |
515 | */ | |
516 | int ata_port_freeze(struct ata_port *ap) | |
517 | { | |
518 | int nr_aborted; | |
519 | ||
520 | WARN_ON(!ap->ops->error_handler); | |
521 | ||
522 | nr_aborted = ata_port_abort(ap); | |
523 | __ata_port_freeze(ap); | |
524 | ||
525 | return nr_aborted; | |
526 | } | |
527 | ||
528 | /** | |
529 | * ata_eh_freeze_port - EH helper to freeze port | |
530 | * @ap: ATA port to freeze | |
531 | * | |
532 | * Freeze @ap. | |
533 | * | |
534 | * LOCKING: | |
535 | * None. | |
536 | */ | |
537 | void ata_eh_freeze_port(struct ata_port *ap) | |
538 | { | |
539 | unsigned long flags; | |
540 | ||
541 | if (!ap->ops->error_handler) | |
542 | return; | |
543 | ||
544 | spin_lock_irqsave(&ap->host_set->lock, flags); | |
545 | __ata_port_freeze(ap); | |
546 | spin_unlock_irqrestore(&ap->host_set->lock, flags); | |
547 | } | |
548 | ||
549 | /** | |
550 | * ata_port_thaw_port - EH helper to thaw port | |
551 | * @ap: ATA port to thaw | |
552 | * | |
553 | * Thaw frozen port @ap. | |
554 | * | |
555 | * LOCKING: | |
556 | * None. | |
557 | */ | |
558 | void ata_eh_thaw_port(struct ata_port *ap) | |
559 | { | |
560 | unsigned long flags; | |
561 | ||
562 | if (!ap->ops->error_handler) | |
563 | return; | |
564 | ||
565 | spin_lock_irqsave(&ap->host_set->lock, flags); | |
566 | ||
567 | ap->flags &= ~ATA_FLAG_FROZEN; | |
568 | ||
569 | if (ap->ops->thaw) | |
570 | ap->ops->thaw(ap); | |
571 | ||
572 | spin_unlock_irqrestore(&ap->host_set->lock, flags); | |
573 | ||
574 | DPRINTK("ata%u port thawed\n", ap->id); | |
575 | } | |
576 | ||
ece1d636 TH |
577 | static void ata_eh_scsidone(struct scsi_cmnd *scmd) |
578 | { | |
579 | /* nada */ | |
580 | } | |
581 | ||
582 | static void __ata_eh_qc_complete(struct ata_queued_cmd *qc) | |
583 | { | |
584 | struct ata_port *ap = qc->ap; | |
585 | struct scsi_cmnd *scmd = qc->scsicmd; | |
586 | unsigned long flags; | |
587 | ||
588 | spin_lock_irqsave(&ap->host_set->lock, flags); | |
589 | qc->scsidone = ata_eh_scsidone; | |
590 | __ata_qc_complete(qc); | |
591 | WARN_ON(ata_tag_valid(qc->tag)); | |
592 | spin_unlock_irqrestore(&ap->host_set->lock, flags); | |
593 | ||
594 | scsi_eh_finish_cmd(scmd, &ap->eh_done_q); | |
595 | } | |
596 | ||
597 | /** | |
598 | * ata_eh_qc_complete - Complete an active ATA command from EH | |
599 | * @qc: Command to complete | |
600 | * | |
601 | * Indicate to the mid and upper layers that an ATA command has | |
602 | * completed. To be used from EH. | |
603 | */ | |
604 | void ata_eh_qc_complete(struct ata_queued_cmd *qc) | |
605 | { | |
606 | struct scsi_cmnd *scmd = qc->scsicmd; | |
607 | scmd->retries = scmd->allowed; | |
608 | __ata_eh_qc_complete(qc); | |
609 | } | |
610 | ||
611 | /** | |
612 | * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH | |
613 | * @qc: Command to retry | |
614 | * | |
615 | * Indicate to the mid and upper layers that an ATA command | |
616 | * should be retried. To be used from EH. | |
617 | * | |
618 | * SCSI midlayer limits the number of retries to scmd->allowed. | |
619 | * scmd->retries is decremented for commands which get retried | |
620 | * due to unrelated failures (qc->err_mask is zero). | |
621 | */ | |
622 | void ata_eh_qc_retry(struct ata_queued_cmd *qc) | |
623 | { | |
624 | struct scsi_cmnd *scmd = qc->scsicmd; | |
625 | if (!qc->err_mask && scmd->retries) | |
626 | scmd->retries--; | |
627 | __ata_eh_qc_complete(qc); | |
628 | } | |
022bdb07 TH |
629 | |
630 | /** | |
631 | * ata_eh_about_to_do - about to perform eh_action | |
632 | * @ap: target ATA port | |
633 | * @action: action about to be performed | |
634 | * | |
635 | * Called just before performing EH actions to clear related bits | |
636 | * in @ap->eh_info such that eh actions are not unnecessarily | |
637 | * repeated. | |
638 | * | |
639 | * LOCKING: | |
640 | * None. | |
641 | */ | |
642 | static void ata_eh_about_to_do(struct ata_port *ap, unsigned int action) | |
643 | { | |
644 | unsigned long flags; | |
645 | ||
646 | spin_lock_irqsave(&ap->host_set->lock, flags); | |
647 | ap->eh_info.action &= ~action; | |
648 | ap->flags |= ATA_FLAG_RECOVERED; | |
649 | spin_unlock_irqrestore(&ap->host_set->lock, flags); | |
650 | } | |
651 | ||
652 | /** | |
653 | * ata_err_string - convert err_mask to descriptive string | |
654 | * @err_mask: error mask to convert to string | |
655 | * | |
656 | * Convert @err_mask to descriptive string. Errors are | |
657 | * prioritized according to severity and only the most severe | |
658 | * error is reported. | |
659 | * | |
660 | * LOCKING: | |
661 | * None. | |
662 | * | |
663 | * RETURNS: | |
664 | * Descriptive string for @err_mask | |
665 | */ | |
666 | static const char * ata_err_string(unsigned int err_mask) | |
667 | { | |
668 | if (err_mask & AC_ERR_HOST_BUS) | |
669 | return "host bus error"; | |
670 | if (err_mask & AC_ERR_ATA_BUS) | |
671 | return "ATA bus error"; | |
672 | if (err_mask & AC_ERR_TIMEOUT) | |
673 | return "timeout"; | |
674 | if (err_mask & AC_ERR_HSM) | |
675 | return "HSM violation"; | |
676 | if (err_mask & AC_ERR_SYSTEM) | |
677 | return "internal error"; | |
678 | if (err_mask & AC_ERR_MEDIA) | |
679 | return "media error"; | |
680 | if (err_mask & AC_ERR_INVALID) | |
681 | return "invalid argument"; | |
682 | if (err_mask & AC_ERR_DEV) | |
683 | return "device error"; | |
684 | return "unknown error"; | |
685 | } | |
686 | ||
687 | /** | |
688 | * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE | |
689 | * @dev: device to perform REQUEST_SENSE to | |
690 | * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long) | |
691 | * | |
692 | * Perform ATAPI REQUEST_SENSE after the device reported CHECK | |
693 | * SENSE. This function is EH helper. | |
694 | * | |
695 | * LOCKING: | |
696 | * Kernel thread context (may sleep). | |
697 | * | |
698 | * RETURNS: | |
699 | * 0 on success, AC_ERR_* mask on failure | |
700 | */ | |
701 | static unsigned int atapi_eh_request_sense(struct ata_device *dev, | |
702 | unsigned char *sense_buf) | |
703 | { | |
704 | struct ata_port *ap = dev->ap; | |
705 | struct ata_taskfile tf; | |
706 | u8 cdb[ATAPI_CDB_LEN]; | |
707 | ||
708 | DPRINTK("ATAPI request sense\n"); | |
709 | ||
710 | ata_tf_init(dev, &tf); | |
711 | ||
712 | /* FIXME: is this needed? */ | |
713 | memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE); | |
714 | ||
715 | /* XXX: why tf_read here? */ | |
716 | ap->ops->tf_read(ap, &tf); | |
717 | ||
718 | /* fill these in, for the case where they are -not- overwritten */ | |
719 | sense_buf[0] = 0x70; | |
720 | sense_buf[2] = tf.feature >> 4; | |
721 | ||
722 | memset(cdb, 0, ATAPI_CDB_LEN); | |
723 | cdb[0] = REQUEST_SENSE; | |
724 | cdb[4] = SCSI_SENSE_BUFFERSIZE; | |
725 | ||
726 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; | |
727 | tf.command = ATA_CMD_PACKET; | |
728 | ||
729 | /* is it pointless to prefer PIO for "safety reasons"? */ | |
730 | if (ap->flags & ATA_FLAG_PIO_DMA) { | |
731 | tf.protocol = ATA_PROT_ATAPI_DMA; | |
732 | tf.feature |= ATAPI_PKT_DMA; | |
733 | } else { | |
734 | tf.protocol = ATA_PROT_ATAPI; | |
735 | tf.lbam = (8 * 1024) & 0xff; | |
736 | tf.lbah = (8 * 1024) >> 8; | |
737 | } | |
738 | ||
739 | return ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE, | |
740 | sense_buf, SCSI_SENSE_BUFFERSIZE); | |
741 | } | |
742 | ||
743 | /** | |
744 | * ata_eh_analyze_serror - analyze SError for a failed port | |
745 | * @ap: ATA port to analyze SError for | |
746 | * | |
747 | * Analyze SError if available and further determine cause of | |
748 | * failure. | |
749 | * | |
750 | * LOCKING: | |
751 | * None. | |
752 | */ | |
753 | static void ata_eh_analyze_serror(struct ata_port *ap) | |
754 | { | |
755 | struct ata_eh_context *ehc = &ap->eh_context; | |
756 | u32 serror = ehc->i.serror; | |
757 | unsigned int err_mask = 0, action = 0; | |
758 | ||
759 | if (serror & SERR_PERSISTENT) { | |
760 | err_mask |= AC_ERR_ATA_BUS; | |
761 | action |= ATA_EH_HARDRESET; | |
762 | } | |
763 | if (serror & | |
764 | (SERR_DATA_RECOVERED | SERR_COMM_RECOVERED | SERR_DATA)) { | |
765 | err_mask |= AC_ERR_ATA_BUS; | |
766 | action |= ATA_EH_SOFTRESET; | |
767 | } | |
768 | if (serror & SERR_PROTOCOL) { | |
769 | err_mask |= AC_ERR_HSM; | |
770 | action |= ATA_EH_SOFTRESET; | |
771 | } | |
772 | if (serror & SERR_INTERNAL) { | |
773 | err_mask |= AC_ERR_SYSTEM; | |
774 | action |= ATA_EH_SOFTRESET; | |
775 | } | |
776 | if (serror & (SERR_PHYRDY_CHG | SERR_DEV_XCHG)) { | |
777 | err_mask |= AC_ERR_ATA_BUS; | |
778 | action |= ATA_EH_HARDRESET; | |
779 | } | |
780 | ||
781 | ehc->i.err_mask |= err_mask; | |
782 | ehc->i.action |= action; | |
783 | } | |
784 | ||
785 | /** | |
786 | * ata_eh_analyze_tf - analyze taskfile of a failed qc | |
787 | * @qc: qc to analyze | |
788 | * @tf: Taskfile registers to analyze | |
789 | * | |
790 | * Analyze taskfile of @qc and further determine cause of | |
791 | * failure. This function also requests ATAPI sense data if | |
792 | * avaliable. | |
793 | * | |
794 | * LOCKING: | |
795 | * Kernel thread context (may sleep). | |
796 | * | |
797 | * RETURNS: | |
798 | * Determined recovery action | |
799 | */ | |
800 | static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd *qc, | |
801 | const struct ata_taskfile *tf) | |
802 | { | |
803 | unsigned int tmp, action = 0; | |
804 | u8 stat = tf->command, err = tf->feature; | |
805 | ||
806 | if ((stat & (ATA_BUSY | ATA_DRQ | ATA_DRDY)) != ATA_DRDY) { | |
807 | qc->err_mask |= AC_ERR_HSM; | |
808 | return ATA_EH_SOFTRESET; | |
809 | } | |
810 | ||
811 | if (!(qc->err_mask & AC_ERR_DEV)) | |
812 | return 0; | |
813 | ||
814 | switch (qc->dev->class) { | |
815 | case ATA_DEV_ATA: | |
816 | if (err & ATA_ICRC) | |
817 | qc->err_mask |= AC_ERR_ATA_BUS; | |
818 | if (err & ATA_UNC) | |
819 | qc->err_mask |= AC_ERR_MEDIA; | |
820 | if (err & ATA_IDNF) | |
821 | qc->err_mask |= AC_ERR_INVALID; | |
822 | break; | |
823 | ||
824 | case ATA_DEV_ATAPI: | |
825 | tmp = atapi_eh_request_sense(qc->dev, | |
826 | qc->scsicmd->sense_buffer); | |
827 | if (!tmp) { | |
828 | /* ATA_QCFLAG_SENSE_VALID is used to tell | |
829 | * atapi_qc_complete() that sense data is | |
830 | * already valid. | |
831 | * | |
832 | * TODO: interpret sense data and set | |
833 | * appropriate err_mask. | |
834 | */ | |
835 | qc->flags |= ATA_QCFLAG_SENSE_VALID; | |
836 | } else | |
837 | qc->err_mask |= tmp; | |
838 | } | |
839 | ||
840 | if (qc->err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT | AC_ERR_ATA_BUS)) | |
841 | action |= ATA_EH_SOFTRESET; | |
842 | ||
843 | return action; | |
844 | } | |
845 | ||
846 | static int ata_eh_categorize_ering_entry(struct ata_ering_entry *ent) | |
847 | { | |
848 | if (ent->err_mask & (AC_ERR_ATA_BUS | AC_ERR_TIMEOUT)) | |
849 | return 1; | |
850 | ||
851 | if (ent->is_io) { | |
852 | if (ent->err_mask & AC_ERR_HSM) | |
853 | return 1; | |
854 | if ((ent->err_mask & | |
855 | (AC_ERR_DEV|AC_ERR_MEDIA|AC_ERR_INVALID)) == AC_ERR_DEV) | |
856 | return 2; | |
857 | } | |
858 | ||
859 | return 0; | |
860 | } | |
861 | ||
862 | struct speed_down_needed_arg { | |
863 | u64 since; | |
864 | int nr_errors[3]; | |
865 | }; | |
866 | ||
867 | static int speed_down_needed_cb(struct ata_ering_entry *ent, void *void_arg) | |
868 | { | |
869 | struct speed_down_needed_arg *arg = void_arg; | |
870 | ||
871 | if (ent->timestamp < arg->since) | |
872 | return -1; | |
873 | ||
874 | arg->nr_errors[ata_eh_categorize_ering_entry(ent)]++; | |
875 | return 0; | |
876 | } | |
877 | ||
878 | /** | |
879 | * ata_eh_speed_down_needed - Determine wheter speed down is necessary | |
880 | * @dev: Device of interest | |
881 | * | |
882 | * This function examines error ring of @dev and determines | |
883 | * whether speed down is necessary. Speed down is necessary if | |
884 | * there have been more than 3 of Cat-1 errors or 10 of Cat-2 | |
885 | * errors during last 15 minutes. | |
886 | * | |
887 | * Cat-1 errors are ATA_BUS, TIMEOUT for any command and HSM | |
888 | * violation for known supported commands. | |
889 | * | |
890 | * Cat-2 errors are unclassified DEV error for known supported | |
891 | * command. | |
892 | * | |
893 | * LOCKING: | |
894 | * Inherited from caller. | |
895 | * | |
896 | * RETURNS: | |
897 | * 1 if speed down is necessary, 0 otherwise | |
898 | */ | |
899 | static int ata_eh_speed_down_needed(struct ata_device *dev) | |
900 | { | |
901 | const u64 interval = 15LLU * 60 * HZ; | |
902 | static const int err_limits[3] = { -1, 3, 10 }; | |
903 | struct speed_down_needed_arg arg; | |
904 | struct ata_ering_entry *ent; | |
905 | int err_cat; | |
906 | u64 j64; | |
907 | ||
908 | ent = ata_ering_top(&dev->ering); | |
909 | if (!ent) | |
910 | return 0; | |
911 | ||
912 | err_cat = ata_eh_categorize_ering_entry(ent); | |
913 | if (err_cat == 0) | |
914 | return 0; | |
915 | ||
916 | memset(&arg, 0, sizeof(arg)); | |
917 | ||
918 | j64 = get_jiffies_64(); | |
919 | if (j64 >= interval) | |
920 | arg.since = j64 - interval; | |
921 | else | |
922 | arg.since = 0; | |
923 | ||
924 | ata_ering_map(&dev->ering, speed_down_needed_cb, &arg); | |
925 | ||
926 | return arg.nr_errors[err_cat] > err_limits[err_cat]; | |
927 | } | |
928 | ||
929 | /** | |
930 | * ata_eh_speed_down - record error and speed down if necessary | |
931 | * @dev: Failed device | |
932 | * @is_io: Did the device fail during normal IO? | |
933 | * @err_mask: err_mask of the error | |
934 | * | |
935 | * Record error and examine error history to determine whether | |
936 | * adjusting transmission speed is necessary. It also sets | |
937 | * transmission limits appropriately if such adjustment is | |
938 | * necessary. | |
939 | * | |
940 | * LOCKING: | |
941 | * Kernel thread context (may sleep). | |
942 | * | |
943 | * RETURNS: | |
944 | * 0 on success, -errno otherwise | |
945 | */ | |
946 | static int ata_eh_speed_down(struct ata_device *dev, int is_io, | |
947 | unsigned int err_mask) | |
948 | { | |
949 | if (!err_mask) | |
950 | return 0; | |
951 | ||
952 | /* record error and determine whether speed down is necessary */ | |
953 | ata_ering_record(&dev->ering, is_io, err_mask); | |
954 | ||
955 | if (!ata_eh_speed_down_needed(dev)) | |
956 | return 0; | |
957 | ||
958 | /* speed down SATA link speed if possible */ | |
959 | if (sata_down_spd_limit(dev->ap) == 0) | |
960 | return ATA_EH_HARDRESET; | |
961 | ||
962 | /* lower transfer mode */ | |
963 | if (ata_down_xfermask_limit(dev, 0) == 0) | |
964 | return ATA_EH_SOFTRESET; | |
965 | ||
966 | ata_dev_printk(dev, KERN_ERR, | |
967 | "speed down requested but no transfer mode left\n"); | |
968 | return 0; | |
969 | } | |
970 | ||
971 | /** | |
972 | * ata_eh_autopsy - analyze error and determine recovery action | |
973 | * @ap: ATA port to perform autopsy on | |
974 | * | |
975 | * Analyze why @ap failed and determine which recovery action is | |
976 | * needed. This function also sets more detailed AC_ERR_* values | |
977 | * and fills sense data for ATAPI CHECK SENSE. | |
978 | * | |
979 | * LOCKING: | |
980 | * Kernel thread context (may sleep). | |
981 | */ | |
982 | static void ata_eh_autopsy(struct ata_port *ap) | |
983 | { | |
984 | struct ata_eh_context *ehc = &ap->eh_context; | |
985 | unsigned int action = ehc->i.action; | |
986 | struct ata_device *failed_dev = NULL; | |
987 | unsigned int all_err_mask = 0; | |
988 | int tag, is_io = 0; | |
989 | u32 serror; | |
990 | int rc; | |
991 | ||
992 | DPRINTK("ENTER\n"); | |
993 | ||
994 | /* obtain and analyze SError */ | |
995 | rc = sata_scr_read(ap, SCR_ERROR, &serror); | |
996 | if (rc == 0) { | |
997 | ehc->i.serror |= serror; | |
998 | ata_eh_analyze_serror(ap); | |
999 | } else if (rc != -EOPNOTSUPP) | |
1000 | action |= ATA_EH_HARDRESET; | |
1001 | ||
1002 | /* any real error trumps AC_ERR_OTHER */ | |
1003 | if (ehc->i.err_mask & ~AC_ERR_OTHER) | |
1004 | ehc->i.err_mask &= ~AC_ERR_OTHER; | |
1005 | ||
1006 | all_err_mask |= ehc->i.err_mask; | |
1007 | ||
1008 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1009 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
1010 | ||
1011 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
1012 | continue; | |
1013 | ||
1014 | /* inherit upper level err_mask */ | |
1015 | qc->err_mask |= ehc->i.err_mask; | |
1016 | ||
1017 | if (qc->err_mask & AC_ERR_TIMEOUT) | |
1018 | action |= ATA_EH_SOFTRESET; | |
1019 | ||
1020 | /* analyze TF */ | |
1021 | action |= ata_eh_analyze_tf(qc, &qc->result_tf); | |
1022 | ||
1023 | /* DEV errors are probably spurious in case of ATA_BUS error */ | |
1024 | if (qc->err_mask & AC_ERR_ATA_BUS) | |
1025 | qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_MEDIA | | |
1026 | AC_ERR_INVALID); | |
1027 | ||
1028 | /* any real error trumps unknown error */ | |
1029 | if (qc->err_mask & ~AC_ERR_OTHER) | |
1030 | qc->err_mask &= ~AC_ERR_OTHER; | |
1031 | ||
1032 | /* SENSE_VALID trumps dev/unknown error and revalidation */ | |
1033 | if (qc->flags & ATA_QCFLAG_SENSE_VALID) { | |
1034 | qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_OTHER); | |
1035 | action &= ~ATA_EH_REVALIDATE; | |
1036 | } | |
1037 | ||
1038 | /* accumulate error info */ | |
1039 | failed_dev = qc->dev; | |
1040 | all_err_mask |= qc->err_mask; | |
1041 | if (qc->flags & ATA_QCFLAG_IO) | |
1042 | is_io = 1; | |
1043 | } | |
1044 | ||
1045 | /* speed down iff command was in progress */ | |
1046 | if (failed_dev) | |
1047 | action |= ata_eh_speed_down(failed_dev, is_io, all_err_mask); | |
1048 | ||
1049 | if (all_err_mask) | |
1050 | action |= ATA_EH_REVALIDATE; | |
1051 | ||
1052 | ehc->i.dev = failed_dev; | |
1053 | ehc->i.action = action; | |
1054 | ||
1055 | DPRINTK("EXIT\n"); | |
1056 | } | |
1057 | ||
1058 | /** | |
1059 | * ata_eh_report - report error handling to user | |
1060 | * @ap: ATA port EH is going on | |
1061 | * | |
1062 | * Report EH to user. | |
1063 | * | |
1064 | * LOCKING: | |
1065 | * None. | |
1066 | */ | |
1067 | static void ata_eh_report(struct ata_port *ap) | |
1068 | { | |
1069 | struct ata_eh_context *ehc = &ap->eh_context; | |
1070 | const char *frozen, *desc; | |
1071 | int tag, nr_failed = 0; | |
1072 | ||
1073 | desc = NULL; | |
1074 | if (ehc->i.desc[0] != '\0') | |
1075 | desc = ehc->i.desc; | |
1076 | ||
1077 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1078 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
1079 | ||
1080 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
1081 | continue; | |
1082 | if (qc->flags & ATA_QCFLAG_SENSE_VALID && !qc->err_mask) | |
1083 | continue; | |
1084 | ||
1085 | nr_failed++; | |
1086 | } | |
1087 | ||
1088 | if (!nr_failed && !ehc->i.err_mask) | |
1089 | return; | |
1090 | ||
1091 | frozen = ""; | |
1092 | if (ap->flags & ATA_FLAG_FROZEN) | |
1093 | frozen = " frozen"; | |
1094 | ||
1095 | if (ehc->i.dev) { | |
1096 | ata_dev_printk(ehc->i.dev, KERN_ERR, | |
1097 | "exception Emask 0x%x SErr 0x%x action 0x%x%s\n", | |
1098 | ehc->i.err_mask, ehc->i.serror, ehc->i.action, | |
1099 | frozen); | |
1100 | if (desc) | |
1101 | ata_dev_printk(ehc->i.dev, KERN_ERR, "(%s)\n", desc); | |
1102 | } else { | |
1103 | ata_port_printk(ap, KERN_ERR, | |
1104 | "exception Emask 0x%x SErr 0x%x action 0x%x%s\n", | |
1105 | ehc->i.err_mask, ehc->i.serror, ehc->i.action, | |
1106 | frozen); | |
1107 | if (desc) | |
1108 | ata_port_printk(ap, KERN_ERR, "(%s)\n", desc); | |
1109 | } | |
1110 | ||
1111 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1112 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
1113 | ||
1114 | if (!(qc->flags & ATA_QCFLAG_FAILED) || !qc->err_mask) | |
1115 | continue; | |
1116 | ||
1117 | ata_dev_printk(qc->dev, KERN_ERR, "tag %d cmd 0x%x " | |
1118 | "Emask 0x%x stat 0x%x err 0x%x (%s)\n", | |
1119 | qc->tag, qc->tf.command, qc->err_mask, | |
1120 | qc->result_tf.command, qc->result_tf.feature, | |
1121 | ata_err_string(qc->err_mask)); | |
1122 | } | |
1123 | } | |
1124 | ||
1125 | static int ata_eh_reset(struct ata_port *ap, ata_reset_fn_t softreset, | |
1126 | ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) | |
1127 | { | |
1128 | struct ata_eh_context *ehc = &ap->eh_context; | |
1129 | unsigned int classes[ATA_MAX_DEVICES]; | |
1130 | int tries = ATA_EH_RESET_TRIES; | |
1131 | ata_reset_fn_t reset; | |
1132 | int rc; | |
1133 | ||
1134 | if (softreset && (!hardreset || (!sata_set_spd_needed(ap) && | |
1135 | !(ehc->i.action & ATA_EH_HARDRESET)))) | |
1136 | reset = softreset; | |
1137 | else | |
1138 | reset = hardreset; | |
1139 | ||
1140 | retry: | |
1141 | ata_port_printk(ap, KERN_INFO, "%s resetting port\n", | |
1142 | reset == softreset ? "soft" : "hard"); | |
1143 | ||
1144 | /* reset */ | |
1145 | ata_eh_about_to_do(ap, ATA_EH_RESET_MASK); | |
1146 | ehc->i.flags |= ATA_EHI_DID_RESET; | |
1147 | ||
1148 | rc = ata_do_reset(ap, reset, classes); | |
1149 | ||
1150 | if (rc && --tries) { | |
1151 | ata_port_printk(ap, KERN_WARNING, | |
1152 | "%sreset failed, retrying in 5 secs\n", | |
1153 | reset == softreset ? "soft" : "hard"); | |
1154 | ssleep(5); | |
1155 | ||
1156 | if (reset == hardreset) | |
1157 | sata_down_spd_limit(ap); | |
1158 | if (hardreset) | |
1159 | reset = hardreset; | |
1160 | goto retry; | |
1161 | } | |
1162 | ||
1163 | if (rc == 0) { | |
1164 | if (postreset) | |
1165 | postreset(ap, classes); | |
1166 | ||
1167 | /* reset successful, schedule revalidation */ | |
1168 | ehc->i.dev = NULL; | |
1169 | ehc->i.action &= ~ATA_EH_RESET_MASK; | |
1170 | ehc->i.action |= ATA_EH_REVALIDATE; | |
1171 | } | |
1172 | ||
1173 | return rc; | |
1174 | } | |
1175 | ||
1176 | static int ata_eh_revalidate(struct ata_port *ap, | |
1177 | struct ata_device **r_failed_dev) | |
1178 | { | |
1179 | struct ata_eh_context *ehc = &ap->eh_context; | |
1180 | struct ata_device *dev; | |
1181 | int i, rc = 0; | |
1182 | ||
1183 | DPRINTK("ENTER\n"); | |
1184 | ||
1185 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
1186 | dev = &ap->device[i]; | |
1187 | ||
1188 | if (ehc->i.action & ATA_EH_REVALIDATE && ata_dev_enabled(dev) && | |
1189 | (!ehc->i.dev || ehc->i.dev == dev)) { | |
1190 | if (ata_port_offline(ap)) { | |
1191 | rc = -EIO; | |
1192 | break; | |
1193 | } | |
1194 | ||
1195 | ata_eh_about_to_do(ap, ATA_EH_REVALIDATE); | |
1196 | rc = ata_dev_revalidate(dev, | |
1197 | ehc->i.flags & ATA_EHI_DID_RESET); | |
1198 | if (rc) | |
1199 | break; | |
1200 | ||
1201 | ehc->i.action &= ~ATA_EH_REVALIDATE; | |
1202 | } | |
1203 | } | |
1204 | ||
1205 | if (rc) | |
1206 | *r_failed_dev = dev; | |
1207 | ||
1208 | DPRINTK("EXIT\n"); | |
1209 | return rc; | |
1210 | } | |
1211 | ||
1212 | static int ata_port_nr_enabled(struct ata_port *ap) | |
1213 | { | |
1214 | int i, cnt = 0; | |
1215 | ||
1216 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1217 | if (ata_dev_enabled(&ap->device[i])) | |
1218 | cnt++; | |
1219 | return cnt; | |
1220 | } | |
1221 | ||
1222 | /** | |
1223 | * ata_eh_recover - recover host port after error | |
1224 | * @ap: host port to recover | |
1225 | * @softreset: softreset method (can be NULL) | |
1226 | * @hardreset: hardreset method (can be NULL) | |
1227 | * @postreset: postreset method (can be NULL) | |
1228 | * | |
1229 | * This is the alpha and omega, eum and yang, heart and soul of | |
1230 | * libata exception handling. On entry, actions required to | |
1231 | * recover each devices are recorded in eh_context. This | |
1232 | * function executes all the operations with appropriate retrials | |
1233 | * and fallbacks to resurrect failed devices. | |
1234 | * | |
1235 | * LOCKING: | |
1236 | * Kernel thread context (may sleep). | |
1237 | * | |
1238 | * RETURNS: | |
1239 | * 0 on success, -errno on failure. | |
1240 | */ | |
1241 | static int ata_eh_recover(struct ata_port *ap, ata_reset_fn_t softreset, | |
1242 | ata_reset_fn_t hardreset, | |
1243 | ata_postreset_fn_t postreset) | |
1244 | { | |
1245 | struct ata_eh_context *ehc = &ap->eh_context; | |
1246 | struct ata_device *dev; | |
1247 | int down_xfermask, i, rc; | |
1248 | ||
1249 | DPRINTK("ENTER\n"); | |
1250 | ||
1251 | /* prep for recovery */ | |
1252 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
1253 | dev = &ap->device[i]; | |
1254 | ||
1255 | ehc->tries[dev->devno] = ATA_EH_DEV_TRIES; | |
1256 | } | |
1257 | ||
1258 | retry: | |
1259 | down_xfermask = 0; | |
1260 | rc = 0; | |
1261 | ||
1262 | /* skip EH if possible. */ | |
1263 | if (!ata_port_nr_enabled(ap) && !(ap->flags & ATA_FLAG_FROZEN)) | |
1264 | ehc->i.action = 0; | |
1265 | ||
1266 | /* reset */ | |
1267 | if (ehc->i.action & ATA_EH_RESET_MASK) { | |
1268 | ata_eh_freeze_port(ap); | |
1269 | ||
1270 | rc = ata_eh_reset(ap, softreset, hardreset, postreset); | |
1271 | if (rc) { | |
1272 | ata_port_printk(ap, KERN_ERR, | |
1273 | "reset failed, giving up\n"); | |
1274 | goto out; | |
1275 | } | |
1276 | ||
1277 | ata_eh_thaw_port(ap); | |
1278 | } | |
1279 | ||
1280 | /* revalidate existing devices */ | |
1281 | rc = ata_eh_revalidate(ap, &dev); | |
1282 | if (rc) | |
1283 | goto dev_fail; | |
1284 | ||
1285 | /* configure transfer mode if the port has been reset */ | |
1286 | if (ehc->i.flags & ATA_EHI_DID_RESET) { | |
1287 | rc = ata_set_mode(ap, &dev); | |
1288 | if (rc) { | |
1289 | down_xfermask = 1; | |
1290 | goto dev_fail; | |
1291 | } | |
1292 | } | |
1293 | ||
1294 | goto out; | |
1295 | ||
1296 | dev_fail: | |
1297 | switch (rc) { | |
1298 | case -ENODEV: | |
1299 | case -EINVAL: | |
1300 | ehc->tries[dev->devno] = 0; | |
1301 | break; | |
1302 | case -EIO: | |
1303 | sata_down_spd_limit(ap); | |
1304 | default: | |
1305 | ehc->tries[dev->devno]--; | |
1306 | if (down_xfermask && | |
1307 | ata_down_xfermask_limit(dev, ehc->tries[dev->devno] == 1)) | |
1308 | ehc->tries[dev->devno] = 0; | |
1309 | } | |
1310 | ||
1311 | /* disable device if it has used up all its chances */ | |
1312 | if (ata_dev_enabled(dev) && !ehc->tries[dev->devno]) | |
1313 | ata_dev_disable(dev); | |
1314 | ||
1315 | /* soft didn't work? be haaaaard */ | |
1316 | if (ehc->i.flags & ATA_EHI_DID_RESET) | |
1317 | ehc->i.action |= ATA_EH_HARDRESET; | |
1318 | else | |
1319 | ehc->i.action |= ATA_EH_SOFTRESET; | |
1320 | ||
1321 | if (ata_port_nr_enabled(ap)) { | |
1322 | ata_port_printk(ap, KERN_WARNING, "failed to recover some " | |
1323 | "devices, retrying in 5 secs\n"); | |
1324 | ssleep(5); | |
1325 | } else { | |
1326 | /* no device left, repeat fast */ | |
1327 | msleep(500); | |
1328 | } | |
1329 | ||
1330 | goto retry; | |
1331 | ||
1332 | out: | |
1333 | if (rc) { | |
1334 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1335 | ata_dev_disable(&ap->device[i]); | |
1336 | } | |
1337 | ||
1338 | DPRINTK("EXIT, rc=%d\n", rc); | |
1339 | return rc; | |
1340 | } | |
1341 | ||
1342 | /** | |
1343 | * ata_eh_finish - finish up EH | |
1344 | * @ap: host port to finish EH for | |
1345 | * | |
1346 | * Recovery is complete. Clean up EH states and retry or finish | |
1347 | * failed qcs. | |
1348 | * | |
1349 | * LOCKING: | |
1350 | * None. | |
1351 | */ | |
1352 | static void ata_eh_finish(struct ata_port *ap) | |
1353 | { | |
1354 | int tag; | |
1355 | ||
1356 | /* retry or finish qcs */ | |
1357 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1358 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
1359 | ||
1360 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
1361 | continue; | |
1362 | ||
1363 | if (qc->err_mask) { | |
1364 | /* FIXME: Once EH migration is complete, | |
1365 | * generate sense data in this function, | |
1366 | * considering both err_mask and tf. | |
1367 | */ | |
1368 | if (qc->err_mask & AC_ERR_INVALID) | |
1369 | ata_eh_qc_complete(qc); | |
1370 | else | |
1371 | ata_eh_qc_retry(qc); | |
1372 | } else { | |
1373 | if (qc->flags & ATA_QCFLAG_SENSE_VALID) { | |
1374 | ata_eh_qc_complete(qc); | |
1375 | } else { | |
1376 | /* feed zero TF to sense generation */ | |
1377 | memset(&qc->result_tf, 0, sizeof(qc->result_tf)); | |
1378 | ata_eh_qc_retry(qc); | |
1379 | } | |
1380 | } | |
1381 | } | |
1382 | } | |
1383 | ||
1384 | /** | |
1385 | * ata_do_eh - do standard error handling | |
1386 | * @ap: host port to handle error for | |
1387 | * @softreset: softreset method (can be NULL) | |
1388 | * @hardreset: hardreset method (can be NULL) | |
1389 | * @postreset: postreset method (can be NULL) | |
1390 | * | |
1391 | * Perform standard error handling sequence. | |
1392 | * | |
1393 | * LOCKING: | |
1394 | * Kernel thread context (may sleep). | |
1395 | */ | |
1396 | void ata_do_eh(struct ata_port *ap, ata_reset_fn_t softreset, | |
1397 | ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) | |
1398 | { | |
1399 | ata_eh_autopsy(ap); | |
1400 | ata_eh_report(ap); | |
1401 | ata_eh_recover(ap, softreset, hardreset, postreset); | |
1402 | ata_eh_finish(ap); | |
1403 | } |