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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/kernel.h> | |
36 | #include <linux/pci.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 | #include "../scsi/scsi_transport_api.h" | |
43 | ||
44 | #include <linux/libata.h> | |
45 | ||
46 | #include "libata.h" | |
47 | ||
48 | enum { | |
49 | /* speed down verdicts */ | |
50 | ATA_EH_SPDN_NCQ_OFF = (1 << 0), | |
51 | ATA_EH_SPDN_SPEED_DOWN = (1 << 1), | |
52 | ATA_EH_SPDN_FALLBACK_TO_PIO = (1 << 2), | |
53 | ATA_EH_SPDN_KEEP_ERRORS = (1 << 3), | |
54 | ||
55 | /* error flags */ | |
56 | ATA_EFLAG_IS_IO = (1 << 0), | |
57 | ATA_EFLAG_DUBIOUS_XFER = (1 << 1), | |
58 | ||
59 | /* error categories */ | |
60 | ATA_ECAT_NONE = 0, | |
61 | ATA_ECAT_ATA_BUS = 1, | |
62 | ATA_ECAT_TOUT_HSM = 2, | |
63 | ATA_ECAT_UNK_DEV = 3, | |
64 | ATA_ECAT_DUBIOUS_NONE = 4, | |
65 | ATA_ECAT_DUBIOUS_ATA_BUS = 5, | |
66 | ATA_ECAT_DUBIOUS_TOUT_HSM = 6, | |
67 | ATA_ECAT_DUBIOUS_UNK_DEV = 7, | |
68 | ATA_ECAT_NR = 8, | |
69 | }; | |
70 | ||
71 | /* Waiting in ->prereset can never be reliable. It's sometimes nice | |
72 | * to wait there but it can't be depended upon; otherwise, we wouldn't | |
73 | * be resetting. Just give it enough time for most drives to spin up. | |
74 | */ | |
75 | enum { | |
76 | ATA_EH_PRERESET_TIMEOUT = 10 * HZ, | |
77 | ATA_EH_FASTDRAIN_INTERVAL = 3 * HZ, | |
78 | }; | |
79 | ||
80 | /* The following table determines how we sequence resets. Each entry | |
81 | * represents timeout for that try. The first try can be soft or | |
82 | * hardreset. All others are hardreset if available. In most cases | |
83 | * the first reset w/ 10sec timeout should succeed. Following entries | |
84 | * are mostly for error handling, hotplug and retarded devices. | |
85 | */ | |
86 | static const unsigned long ata_eh_reset_timeouts[] = { | |
87 | 10 * HZ, /* most drives spin up by 10sec */ | |
88 | 10 * HZ, /* > 99% working drives spin up before 20sec */ | |
89 | 35 * HZ, /* give > 30 secs of idleness for retarded devices */ | |
90 | 5 * HZ, /* and sweet one last chance */ | |
91 | /* > 1 min has elapsed, give up */ | |
92 | }; | |
93 | ||
94 | static void __ata_port_freeze(struct ata_port *ap); | |
95 | #ifdef CONFIG_PM | |
96 | static void ata_eh_handle_port_suspend(struct ata_port *ap); | |
97 | static void ata_eh_handle_port_resume(struct ata_port *ap); | |
98 | #else /* CONFIG_PM */ | |
99 | static void ata_eh_handle_port_suspend(struct ata_port *ap) | |
100 | { } | |
101 | ||
102 | static void ata_eh_handle_port_resume(struct ata_port *ap) | |
103 | { } | |
104 | #endif /* CONFIG_PM */ | |
105 | ||
106 | static void __ata_ehi_pushv_desc(struct ata_eh_info *ehi, const char *fmt, | |
107 | va_list args) | |
108 | { | |
109 | ehi->desc_len += vscnprintf(ehi->desc + ehi->desc_len, | |
110 | ATA_EH_DESC_LEN - ehi->desc_len, | |
111 | fmt, args); | |
112 | } | |
113 | ||
114 | /** | |
115 | * __ata_ehi_push_desc - push error description without adding separator | |
116 | * @ehi: target EHI | |
117 | * @fmt: printf format string | |
118 | * | |
119 | * Format string according to @fmt and append it to @ehi->desc. | |
120 | * | |
121 | * LOCKING: | |
122 | * spin_lock_irqsave(host lock) | |
123 | */ | |
124 | void __ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...) | |
125 | { | |
126 | va_list args; | |
127 | ||
128 | va_start(args, fmt); | |
129 | __ata_ehi_pushv_desc(ehi, fmt, args); | |
130 | va_end(args); | |
131 | } | |
132 | ||
133 | /** | |
134 | * ata_ehi_push_desc - push error description with separator | |
135 | * @ehi: target EHI | |
136 | * @fmt: printf format string | |
137 | * | |
138 | * Format string according to @fmt and append it to @ehi->desc. | |
139 | * If @ehi->desc is not empty, ", " is added in-between. | |
140 | * | |
141 | * LOCKING: | |
142 | * spin_lock_irqsave(host lock) | |
143 | */ | |
144 | void ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...) | |
145 | { | |
146 | va_list args; | |
147 | ||
148 | if (ehi->desc_len) | |
149 | __ata_ehi_push_desc(ehi, ", "); | |
150 | ||
151 | va_start(args, fmt); | |
152 | __ata_ehi_pushv_desc(ehi, fmt, args); | |
153 | va_end(args); | |
154 | } | |
155 | ||
156 | /** | |
157 | * ata_ehi_clear_desc - clean error description | |
158 | * @ehi: target EHI | |
159 | * | |
160 | * Clear @ehi->desc. | |
161 | * | |
162 | * LOCKING: | |
163 | * spin_lock_irqsave(host lock) | |
164 | */ | |
165 | void ata_ehi_clear_desc(struct ata_eh_info *ehi) | |
166 | { | |
167 | ehi->desc[0] = '\0'; | |
168 | ehi->desc_len = 0; | |
169 | } | |
170 | ||
171 | /** | |
172 | * ata_port_desc - append port description | |
173 | * @ap: target ATA port | |
174 | * @fmt: printf format string | |
175 | * | |
176 | * Format string according to @fmt and append it to port | |
177 | * description. If port description is not empty, " " is added | |
178 | * in-between. This function is to be used while initializing | |
179 | * ata_host. The description is printed on host registration. | |
180 | * | |
181 | * LOCKING: | |
182 | * None. | |
183 | */ | |
184 | void ata_port_desc(struct ata_port *ap, const char *fmt, ...) | |
185 | { | |
186 | va_list args; | |
187 | ||
188 | WARN_ON(!(ap->pflags & ATA_PFLAG_INITIALIZING)); | |
189 | ||
190 | if (ap->link.eh_info.desc_len) | |
191 | __ata_ehi_push_desc(&ap->link.eh_info, " "); | |
192 | ||
193 | va_start(args, fmt); | |
194 | __ata_ehi_pushv_desc(&ap->link.eh_info, fmt, args); | |
195 | va_end(args); | |
196 | } | |
197 | ||
198 | #ifdef CONFIG_PCI | |
199 | ||
200 | /** | |
201 | * ata_port_pbar_desc - append PCI BAR description | |
202 | * @ap: target ATA port | |
203 | * @bar: target PCI BAR | |
204 | * @offset: offset into PCI BAR | |
205 | * @name: name of the area | |
206 | * | |
207 | * If @offset is negative, this function formats a string which | |
208 | * contains the name, address, size and type of the BAR and | |
209 | * appends it to the port description. If @offset is zero or | |
210 | * positive, only name and offsetted address is appended. | |
211 | * | |
212 | * LOCKING: | |
213 | * None. | |
214 | */ | |
215 | void ata_port_pbar_desc(struct ata_port *ap, int bar, ssize_t offset, | |
216 | const char *name) | |
217 | { | |
218 | struct pci_dev *pdev = to_pci_dev(ap->host->dev); | |
219 | char *type = ""; | |
220 | unsigned long long start, len; | |
221 | ||
222 | if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) | |
223 | type = "m"; | |
224 | else if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) | |
225 | type = "i"; | |
226 | ||
227 | start = (unsigned long long)pci_resource_start(pdev, bar); | |
228 | len = (unsigned long long)pci_resource_len(pdev, bar); | |
229 | ||
230 | if (offset < 0) | |
231 | ata_port_desc(ap, "%s %s%llu@0x%llx", name, type, len, start); | |
232 | else | |
233 | ata_port_desc(ap, "%s 0x%llx", name, | |
234 | start + (unsigned long long)offset); | |
235 | } | |
236 | ||
237 | #endif /* CONFIG_PCI */ | |
238 | ||
239 | static void ata_ering_record(struct ata_ering *ering, unsigned int eflags, | |
240 | unsigned int err_mask) | |
241 | { | |
242 | struct ata_ering_entry *ent; | |
243 | ||
244 | WARN_ON(!err_mask); | |
245 | ||
246 | ering->cursor++; | |
247 | ering->cursor %= ATA_ERING_SIZE; | |
248 | ||
249 | ent = &ering->ring[ering->cursor]; | |
250 | ent->eflags = eflags; | |
251 | ent->err_mask = err_mask; | |
252 | ent->timestamp = get_jiffies_64(); | |
253 | } | |
254 | ||
255 | static struct ata_ering_entry *ata_ering_top(struct ata_ering *ering) | |
256 | { | |
257 | struct ata_ering_entry *ent = &ering->ring[ering->cursor]; | |
258 | ||
259 | if (ent->err_mask) | |
260 | return ent; | |
261 | return NULL; | |
262 | } | |
263 | ||
264 | static void ata_ering_clear(struct ata_ering *ering) | |
265 | { | |
266 | memset(ering, 0, sizeof(*ering)); | |
267 | } | |
268 | ||
269 | static int ata_ering_map(struct ata_ering *ering, | |
270 | int (*map_fn)(struct ata_ering_entry *, void *), | |
271 | void *arg) | |
272 | { | |
273 | int idx, rc = 0; | |
274 | struct ata_ering_entry *ent; | |
275 | ||
276 | idx = ering->cursor; | |
277 | do { | |
278 | ent = &ering->ring[idx]; | |
279 | if (!ent->err_mask) | |
280 | break; | |
281 | rc = map_fn(ent, arg); | |
282 | if (rc) | |
283 | break; | |
284 | idx = (idx - 1 + ATA_ERING_SIZE) % ATA_ERING_SIZE; | |
285 | } while (idx != ering->cursor); | |
286 | ||
287 | return rc; | |
288 | } | |
289 | ||
290 | static unsigned int ata_eh_dev_action(struct ata_device *dev) | |
291 | { | |
292 | struct ata_eh_context *ehc = &dev->link->eh_context; | |
293 | ||
294 | return ehc->i.action | ehc->i.dev_action[dev->devno]; | |
295 | } | |
296 | ||
297 | static void ata_eh_clear_action(struct ata_link *link, struct ata_device *dev, | |
298 | struct ata_eh_info *ehi, unsigned int action) | |
299 | { | |
300 | struct ata_device *tdev; | |
301 | ||
302 | if (!dev) { | |
303 | ehi->action &= ~action; | |
304 | ata_link_for_each_dev(tdev, link) | |
305 | ehi->dev_action[tdev->devno] &= ~action; | |
306 | } else { | |
307 | /* doesn't make sense for port-wide EH actions */ | |
308 | WARN_ON(!(action & ATA_EH_PERDEV_MASK)); | |
309 | ||
310 | /* break ehi->action into ehi->dev_action */ | |
311 | if (ehi->action & action) { | |
312 | ata_link_for_each_dev(tdev, link) | |
313 | ehi->dev_action[tdev->devno] |= | |
314 | ehi->action & action; | |
315 | ehi->action &= ~action; | |
316 | } | |
317 | ||
318 | /* turn off the specified per-dev action */ | |
319 | ehi->dev_action[dev->devno] &= ~action; | |
320 | } | |
321 | } | |
322 | ||
323 | /** | |
324 | * ata_scsi_timed_out - SCSI layer time out callback | |
325 | * @cmd: timed out SCSI command | |
326 | * | |
327 | * Handles SCSI layer timeout. We race with normal completion of | |
328 | * the qc for @cmd. If the qc is already gone, we lose and let | |
329 | * the scsi command finish (EH_HANDLED). Otherwise, the qc has | |
330 | * timed out and EH should be invoked. Prevent ata_qc_complete() | |
331 | * from finishing it by setting EH_SCHEDULED and return | |
332 | * EH_NOT_HANDLED. | |
333 | * | |
334 | * TODO: kill this function once old EH is gone. | |
335 | * | |
336 | * LOCKING: | |
337 | * Called from timer context | |
338 | * | |
339 | * RETURNS: | |
340 | * EH_HANDLED or EH_NOT_HANDLED | |
341 | */ | |
342 | enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd) | |
343 | { | |
344 | struct Scsi_Host *host = cmd->device->host; | |
345 | struct ata_port *ap = ata_shost_to_port(host); | |
346 | unsigned long flags; | |
347 | struct ata_queued_cmd *qc; | |
348 | enum scsi_eh_timer_return ret; | |
349 | ||
350 | DPRINTK("ENTER\n"); | |
351 | ||
352 | if (ap->ops->error_handler) { | |
353 | ret = EH_NOT_HANDLED; | |
354 | goto out; | |
355 | } | |
356 | ||
357 | ret = EH_HANDLED; | |
358 | spin_lock_irqsave(ap->lock, flags); | |
359 | qc = ata_qc_from_tag(ap, ap->link.active_tag); | |
360 | if (qc) { | |
361 | WARN_ON(qc->scsicmd != cmd); | |
362 | qc->flags |= ATA_QCFLAG_EH_SCHEDULED; | |
363 | qc->err_mask |= AC_ERR_TIMEOUT; | |
364 | ret = EH_NOT_HANDLED; | |
365 | } | |
366 | spin_unlock_irqrestore(ap->lock, flags); | |
367 | ||
368 | out: | |
369 | DPRINTK("EXIT, ret=%d\n", ret); | |
370 | return ret; | |
371 | } | |
372 | ||
373 | /** | |
374 | * ata_scsi_error - SCSI layer error handler callback | |
375 | * @host: SCSI host on which error occurred | |
376 | * | |
377 | * Handles SCSI-layer-thrown error events. | |
378 | * | |
379 | * LOCKING: | |
380 | * Inherited from SCSI layer (none, can sleep) | |
381 | * | |
382 | * RETURNS: | |
383 | * Zero. | |
384 | */ | |
385 | void ata_scsi_error(struct Scsi_Host *host) | |
386 | { | |
387 | struct ata_port *ap = ata_shost_to_port(host); | |
388 | int i; | |
389 | unsigned long flags; | |
390 | ||
391 | DPRINTK("ENTER\n"); | |
392 | ||
393 | /* synchronize with port task */ | |
394 | ata_port_flush_task(ap); | |
395 | ||
396 | /* synchronize with host lock and sort out timeouts */ | |
397 | ||
398 | /* For new EH, all qcs are finished in one of three ways - | |
399 | * normal completion, error completion, and SCSI timeout. | |
400 | * Both cmpletions can race against SCSI timeout. When normal | |
401 | * completion wins, the qc never reaches EH. When error | |
402 | * completion wins, the qc has ATA_QCFLAG_FAILED set. | |
403 | * | |
404 | * When SCSI timeout wins, things are a bit more complex. | |
405 | * Normal or error completion can occur after the timeout but | |
406 | * before this point. In such cases, both types of | |
407 | * completions are honored. A scmd is determined to have | |
408 | * timed out iff its associated qc is active and not failed. | |
409 | */ | |
410 | if (ap->ops->error_handler) { | |
411 | struct scsi_cmnd *scmd, *tmp; | |
412 | int nr_timedout = 0; | |
413 | ||
414 | spin_lock_irqsave(ap->lock, flags); | |
415 | ||
416 | list_for_each_entry_safe(scmd, tmp, &host->eh_cmd_q, eh_entry) { | |
417 | struct ata_queued_cmd *qc; | |
418 | ||
419 | for (i = 0; i < ATA_MAX_QUEUE; i++) { | |
420 | qc = __ata_qc_from_tag(ap, i); | |
421 | if (qc->flags & ATA_QCFLAG_ACTIVE && | |
422 | qc->scsicmd == scmd) | |
423 | break; | |
424 | } | |
425 | ||
426 | if (i < ATA_MAX_QUEUE) { | |
427 | /* the scmd has an associated qc */ | |
428 | if (!(qc->flags & ATA_QCFLAG_FAILED)) { | |
429 | /* which hasn't failed yet, timeout */ | |
430 | qc->err_mask |= AC_ERR_TIMEOUT; | |
431 | qc->flags |= ATA_QCFLAG_FAILED; | |
432 | nr_timedout++; | |
433 | } | |
434 | } else { | |
435 | /* Normal completion occurred after | |
436 | * SCSI timeout but before this point. | |
437 | * Successfully complete it. | |
438 | */ | |
439 | scmd->retries = scmd->allowed; | |
440 | scsi_eh_finish_cmd(scmd, &ap->eh_done_q); | |
441 | } | |
442 | } | |
443 | ||
444 | /* If we have timed out qcs. They belong to EH from | |
445 | * this point but the state of the controller is | |
446 | * unknown. Freeze the port to make sure the IRQ | |
447 | * handler doesn't diddle with those qcs. This must | |
448 | * be done atomically w.r.t. setting QCFLAG_FAILED. | |
449 | */ | |
450 | if (nr_timedout) | |
451 | __ata_port_freeze(ap); | |
452 | ||
453 | spin_unlock_irqrestore(ap->lock, flags); | |
454 | ||
455 | /* initialize eh_tries */ | |
456 | ap->eh_tries = ATA_EH_MAX_TRIES; | |
457 | } else | |
458 | spin_unlock_wait(ap->lock); | |
459 | ||
460 | repeat: | |
461 | /* invoke error handler */ | |
462 | if (ap->ops->error_handler) { | |
463 | struct ata_link *link; | |
464 | ||
465 | /* kill fast drain timer */ | |
466 | del_timer_sync(&ap->fastdrain_timer); | |
467 | ||
468 | /* process port resume request */ | |
469 | ata_eh_handle_port_resume(ap); | |
470 | ||
471 | /* fetch & clear EH info */ | |
472 | spin_lock_irqsave(ap->lock, flags); | |
473 | ||
474 | __ata_port_for_each_link(link, ap) { | |
475 | struct ata_eh_context *ehc = &link->eh_context; | |
476 | struct ata_device *dev; | |
477 | ||
478 | memset(&link->eh_context, 0, sizeof(link->eh_context)); | |
479 | link->eh_context.i = link->eh_info; | |
480 | memset(&link->eh_info, 0, sizeof(link->eh_info)); | |
481 | ||
482 | ata_link_for_each_dev(dev, link) { | |
483 | int devno = dev->devno; | |
484 | ||
485 | ehc->saved_xfer_mode[devno] = dev->xfer_mode; | |
486 | if (ata_ncq_enabled(dev)) | |
487 | ehc->saved_ncq_enabled |= 1 << devno; | |
488 | } | |
489 | } | |
490 | ||
491 | ap->pflags |= ATA_PFLAG_EH_IN_PROGRESS; | |
492 | ap->pflags &= ~ATA_PFLAG_EH_PENDING; | |
493 | ap->excl_link = NULL; /* don't maintain exclusion over EH */ | |
494 | ||
495 | spin_unlock_irqrestore(ap->lock, flags); | |
496 | ||
497 | /* invoke EH, skip if unloading or suspended */ | |
498 | if (!(ap->pflags & (ATA_PFLAG_UNLOADING | ATA_PFLAG_SUSPENDED))) | |
499 | ap->ops->error_handler(ap); | |
500 | else | |
501 | ata_eh_finish(ap); | |
502 | ||
503 | /* process port suspend request */ | |
504 | ata_eh_handle_port_suspend(ap); | |
505 | ||
506 | /* Exception might have happend after ->error_handler | |
507 | * recovered the port but before this point. Repeat | |
508 | * EH in such case. | |
509 | */ | |
510 | spin_lock_irqsave(ap->lock, flags); | |
511 | ||
512 | if (ap->pflags & ATA_PFLAG_EH_PENDING) { | |
513 | if (--ap->eh_tries) { | |
514 | spin_unlock_irqrestore(ap->lock, flags); | |
515 | goto repeat; | |
516 | } | |
517 | ata_port_printk(ap, KERN_ERR, "EH pending after %d " | |
518 | "tries, giving up\n", ATA_EH_MAX_TRIES); | |
519 | ap->pflags &= ~ATA_PFLAG_EH_PENDING; | |
520 | } | |
521 | ||
522 | /* this run is complete, make sure EH info is clear */ | |
523 | __ata_port_for_each_link(link, ap) | |
524 | memset(&link->eh_info, 0, sizeof(link->eh_info)); | |
525 | ||
526 | /* Clear host_eh_scheduled while holding ap->lock such | |
527 | * that if exception occurs after this point but | |
528 | * before EH completion, SCSI midlayer will | |
529 | * re-initiate EH. | |
530 | */ | |
531 | host->host_eh_scheduled = 0; | |
532 | ||
533 | spin_unlock_irqrestore(ap->lock, flags); | |
534 | } else { | |
535 | WARN_ON(ata_qc_from_tag(ap, ap->link.active_tag) == NULL); | |
536 | ap->ops->eng_timeout(ap); | |
537 | } | |
538 | ||
539 | /* finish or retry handled scmd's and clean up */ | |
540 | WARN_ON(host->host_failed || !list_empty(&host->eh_cmd_q)); | |
541 | ||
542 | scsi_eh_flush_done_q(&ap->eh_done_q); | |
543 | ||
544 | /* clean up */ | |
545 | spin_lock_irqsave(ap->lock, flags); | |
546 | ||
547 | if (ap->pflags & ATA_PFLAG_LOADING) | |
548 | ap->pflags &= ~ATA_PFLAG_LOADING; | |
549 | else if (ap->pflags & ATA_PFLAG_SCSI_HOTPLUG) | |
550 | queue_delayed_work(ata_aux_wq, &ap->hotplug_task, 0); | |
551 | ||
552 | if (ap->pflags & ATA_PFLAG_RECOVERED) | |
553 | ata_port_printk(ap, KERN_INFO, "EH complete\n"); | |
554 | ||
555 | ap->pflags &= ~(ATA_PFLAG_SCSI_HOTPLUG | ATA_PFLAG_RECOVERED); | |
556 | ||
557 | /* tell wait_eh that we're done */ | |
558 | ap->pflags &= ~ATA_PFLAG_EH_IN_PROGRESS; | |
559 | wake_up_all(&ap->eh_wait_q); | |
560 | ||
561 | spin_unlock_irqrestore(ap->lock, flags); | |
562 | ||
563 | DPRINTK("EXIT\n"); | |
564 | } | |
565 | ||
566 | /** | |
567 | * ata_port_wait_eh - Wait for the currently pending EH to complete | |
568 | * @ap: Port to wait EH for | |
569 | * | |
570 | * Wait until the currently pending EH is complete. | |
571 | * | |
572 | * LOCKING: | |
573 | * Kernel thread context (may sleep). | |
574 | */ | |
575 | void ata_port_wait_eh(struct ata_port *ap) | |
576 | { | |
577 | unsigned long flags; | |
578 | DEFINE_WAIT(wait); | |
579 | ||
580 | retry: | |
581 | spin_lock_irqsave(ap->lock, flags); | |
582 | ||
583 | while (ap->pflags & (ATA_PFLAG_EH_PENDING | ATA_PFLAG_EH_IN_PROGRESS)) { | |
584 | prepare_to_wait(&ap->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE); | |
585 | spin_unlock_irqrestore(ap->lock, flags); | |
586 | schedule(); | |
587 | spin_lock_irqsave(ap->lock, flags); | |
588 | } | |
589 | finish_wait(&ap->eh_wait_q, &wait); | |
590 | ||
591 | spin_unlock_irqrestore(ap->lock, flags); | |
592 | ||
593 | /* make sure SCSI EH is complete */ | |
594 | if (scsi_host_in_recovery(ap->scsi_host)) { | |
595 | msleep(10); | |
596 | goto retry; | |
597 | } | |
598 | } | |
599 | ||
600 | static int ata_eh_nr_in_flight(struct ata_port *ap) | |
601 | { | |
602 | unsigned int tag; | |
603 | int nr = 0; | |
604 | ||
605 | /* count only non-internal commands */ | |
606 | for (tag = 0; tag < ATA_MAX_QUEUE - 1; tag++) | |
607 | if (ata_qc_from_tag(ap, tag)) | |
608 | nr++; | |
609 | ||
610 | return nr; | |
611 | } | |
612 | ||
613 | void ata_eh_fastdrain_timerfn(unsigned long arg) | |
614 | { | |
615 | struct ata_port *ap = (void *)arg; | |
616 | unsigned long flags; | |
617 | int cnt; | |
618 | ||
619 | spin_lock_irqsave(ap->lock, flags); | |
620 | ||
621 | cnt = ata_eh_nr_in_flight(ap); | |
622 | ||
623 | /* are we done? */ | |
624 | if (!cnt) | |
625 | goto out_unlock; | |
626 | ||
627 | if (cnt == ap->fastdrain_cnt) { | |
628 | unsigned int tag; | |
629 | ||
630 | /* No progress during the last interval, tag all | |
631 | * in-flight qcs as timed out and freeze the port. | |
632 | */ | |
633 | for (tag = 0; tag < ATA_MAX_QUEUE - 1; tag++) { | |
634 | struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag); | |
635 | if (qc) | |
636 | qc->err_mask |= AC_ERR_TIMEOUT; | |
637 | } | |
638 | ||
639 | ata_port_freeze(ap); | |
640 | } else { | |
641 | /* some qcs have finished, give it another chance */ | |
642 | ap->fastdrain_cnt = cnt; | |
643 | ap->fastdrain_timer.expires = | |
644 | jiffies + ATA_EH_FASTDRAIN_INTERVAL; | |
645 | add_timer(&ap->fastdrain_timer); | |
646 | } | |
647 | ||
648 | out_unlock: | |
649 | spin_unlock_irqrestore(ap->lock, flags); | |
650 | } | |
651 | ||
652 | /** | |
653 | * ata_eh_set_pending - set ATA_PFLAG_EH_PENDING and activate fast drain | |
654 | * @ap: target ATA port | |
655 | * @fastdrain: activate fast drain | |
656 | * | |
657 | * Set ATA_PFLAG_EH_PENDING and activate fast drain if @fastdrain | |
658 | * is non-zero and EH wasn't pending before. Fast drain ensures | |
659 | * that EH kicks in in timely manner. | |
660 | * | |
661 | * LOCKING: | |
662 | * spin_lock_irqsave(host lock) | |
663 | */ | |
664 | static void ata_eh_set_pending(struct ata_port *ap, int fastdrain) | |
665 | { | |
666 | int cnt; | |
667 | ||
668 | /* already scheduled? */ | |
669 | if (ap->pflags & ATA_PFLAG_EH_PENDING) | |
670 | return; | |
671 | ||
672 | ap->pflags |= ATA_PFLAG_EH_PENDING; | |
673 | ||
674 | if (!fastdrain) | |
675 | return; | |
676 | ||
677 | /* do we have in-flight qcs? */ | |
678 | cnt = ata_eh_nr_in_flight(ap); | |
679 | if (!cnt) | |
680 | return; | |
681 | ||
682 | /* activate fast drain */ | |
683 | ap->fastdrain_cnt = cnt; | |
684 | ap->fastdrain_timer.expires = jiffies + ATA_EH_FASTDRAIN_INTERVAL; | |
685 | add_timer(&ap->fastdrain_timer); | |
686 | } | |
687 | ||
688 | /** | |
689 | * ata_qc_schedule_eh - schedule qc for error handling | |
690 | * @qc: command to schedule error handling for | |
691 | * | |
692 | * Schedule error handling for @qc. EH will kick in as soon as | |
693 | * other commands are drained. | |
694 | * | |
695 | * LOCKING: | |
696 | * spin_lock_irqsave(host lock) | |
697 | */ | |
698 | void ata_qc_schedule_eh(struct ata_queued_cmd *qc) | |
699 | { | |
700 | struct ata_port *ap = qc->ap; | |
701 | ||
702 | WARN_ON(!ap->ops->error_handler); | |
703 | ||
704 | qc->flags |= ATA_QCFLAG_FAILED; | |
705 | ata_eh_set_pending(ap, 1); | |
706 | ||
707 | /* The following will fail if timeout has already expired. | |
708 | * ata_scsi_error() takes care of such scmds on EH entry. | |
709 | * Note that ATA_QCFLAG_FAILED is unconditionally set after | |
710 | * this function completes. | |
711 | */ | |
712 | scsi_req_abort_cmd(qc->scsicmd); | |
713 | } | |
714 | ||
715 | /** | |
716 | * ata_port_schedule_eh - schedule error handling without a qc | |
717 | * @ap: ATA port to schedule EH for | |
718 | * | |
719 | * Schedule error handling for @ap. EH will kick in as soon as | |
720 | * all commands are drained. | |
721 | * | |
722 | * LOCKING: | |
723 | * spin_lock_irqsave(host lock) | |
724 | */ | |
725 | void ata_port_schedule_eh(struct ata_port *ap) | |
726 | { | |
727 | WARN_ON(!ap->ops->error_handler); | |
728 | ||
729 | if (ap->pflags & ATA_PFLAG_INITIALIZING) | |
730 | return; | |
731 | ||
732 | ata_eh_set_pending(ap, 1); | |
733 | scsi_schedule_eh(ap->scsi_host); | |
734 | ||
735 | DPRINTK("port EH scheduled\n"); | |
736 | } | |
737 | ||
738 | static int ata_do_link_abort(struct ata_port *ap, struct ata_link *link) | |
739 | { | |
740 | int tag, nr_aborted = 0; | |
741 | ||
742 | WARN_ON(!ap->ops->error_handler); | |
743 | ||
744 | /* we're gonna abort all commands, no need for fast drain */ | |
745 | ata_eh_set_pending(ap, 0); | |
746 | ||
747 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
748 | struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag); | |
749 | ||
750 | if (qc && (!link || qc->dev->link == link)) { | |
751 | qc->flags |= ATA_QCFLAG_FAILED; | |
752 | ata_qc_complete(qc); | |
753 | nr_aborted++; | |
754 | } | |
755 | } | |
756 | ||
757 | if (!nr_aborted) | |
758 | ata_port_schedule_eh(ap); | |
759 | ||
760 | return nr_aborted; | |
761 | } | |
762 | ||
763 | /** | |
764 | * ata_link_abort - abort all qc's on the link | |
765 | * @link: ATA link to abort qc's for | |
766 | * | |
767 | * Abort all active qc's active on @link and schedule EH. | |
768 | * | |
769 | * LOCKING: | |
770 | * spin_lock_irqsave(host lock) | |
771 | * | |
772 | * RETURNS: | |
773 | * Number of aborted qc's. | |
774 | */ | |
775 | int ata_link_abort(struct ata_link *link) | |
776 | { | |
777 | return ata_do_link_abort(link->ap, link); | |
778 | } | |
779 | ||
780 | /** | |
781 | * ata_port_abort - abort all qc's on the port | |
782 | * @ap: ATA port to abort qc's for | |
783 | * | |
784 | * Abort all active qc's of @ap and schedule EH. | |
785 | * | |
786 | * LOCKING: | |
787 | * spin_lock_irqsave(host_set lock) | |
788 | * | |
789 | * RETURNS: | |
790 | * Number of aborted qc's. | |
791 | */ | |
792 | int ata_port_abort(struct ata_port *ap) | |
793 | { | |
794 | return ata_do_link_abort(ap, NULL); | |
795 | } | |
796 | ||
797 | /** | |
798 | * __ata_port_freeze - freeze port | |
799 | * @ap: ATA port to freeze | |
800 | * | |
801 | * This function is called when HSM violation or some other | |
802 | * condition disrupts normal operation of the port. Frozen port | |
803 | * is not allowed to perform any operation until the port is | |
804 | * thawed, which usually follows a successful reset. | |
805 | * | |
806 | * ap->ops->freeze() callback can be used for freezing the port | |
807 | * hardware-wise (e.g. mask interrupt and stop DMA engine). If a | |
808 | * port cannot be frozen hardware-wise, the interrupt handler | |
809 | * must ack and clear interrupts unconditionally while the port | |
810 | * is frozen. | |
811 | * | |
812 | * LOCKING: | |
813 | * spin_lock_irqsave(host lock) | |
814 | */ | |
815 | static void __ata_port_freeze(struct ata_port *ap) | |
816 | { | |
817 | WARN_ON(!ap->ops->error_handler); | |
818 | ||
819 | if (ap->ops->freeze) | |
820 | ap->ops->freeze(ap); | |
821 | ||
822 | ap->pflags |= ATA_PFLAG_FROZEN; | |
823 | ||
824 | DPRINTK("ata%u port frozen\n", ap->print_id); | |
825 | } | |
826 | ||
827 | /** | |
828 | * ata_port_freeze - abort & freeze port | |
829 | * @ap: ATA port to freeze | |
830 | * | |
831 | * Abort and freeze @ap. | |
832 | * | |
833 | * LOCKING: | |
834 | * spin_lock_irqsave(host lock) | |
835 | * | |
836 | * RETURNS: | |
837 | * Number of aborted commands. | |
838 | */ | |
839 | int ata_port_freeze(struct ata_port *ap) | |
840 | { | |
841 | int nr_aborted; | |
842 | ||
843 | WARN_ON(!ap->ops->error_handler); | |
844 | ||
845 | nr_aborted = ata_port_abort(ap); | |
846 | __ata_port_freeze(ap); | |
847 | ||
848 | return nr_aborted; | |
849 | } | |
850 | ||
851 | /** | |
852 | * sata_async_notification - SATA async notification handler | |
853 | * @ap: ATA port where async notification is received | |
854 | * | |
855 | * Handler to be called when async notification via SDB FIS is | |
856 | * received. This function schedules EH if necessary. | |
857 | * | |
858 | * LOCKING: | |
859 | * spin_lock_irqsave(host lock) | |
860 | * | |
861 | * RETURNS: | |
862 | * 1 if EH is scheduled, 0 otherwise. | |
863 | */ | |
864 | int sata_async_notification(struct ata_port *ap) | |
865 | { | |
866 | u32 sntf; | |
867 | int rc; | |
868 | ||
869 | if (!(ap->flags & ATA_FLAG_AN)) | |
870 | return 0; | |
871 | ||
872 | rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf); | |
873 | if (rc == 0) | |
874 | sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf); | |
875 | ||
876 | if (!sata_pmp_attached(ap) || rc) { | |
877 | /* PMP is not attached or SNTF is not available */ | |
878 | if (!sata_pmp_attached(ap)) { | |
879 | /* PMP is not attached. Check whether ATAPI | |
880 | * AN is configured. If so, notify media | |
881 | * change. | |
882 | */ | |
883 | struct ata_device *dev = ap->link.device; | |
884 | ||
885 | if ((dev->class == ATA_DEV_ATAPI) && | |
886 | (dev->flags & ATA_DFLAG_AN)) | |
887 | ata_scsi_media_change_notify(dev); | |
888 | return 0; | |
889 | } else { | |
890 | /* PMP is attached but SNTF is not available. | |
891 | * ATAPI async media change notification is | |
892 | * not used. The PMP must be reporting PHY | |
893 | * status change, schedule EH. | |
894 | */ | |
895 | ata_port_schedule_eh(ap); | |
896 | return 1; | |
897 | } | |
898 | } else { | |
899 | /* PMP is attached and SNTF is available */ | |
900 | struct ata_link *link; | |
901 | ||
902 | /* check and notify ATAPI AN */ | |
903 | ata_port_for_each_link(link, ap) { | |
904 | if (!(sntf & (1 << link->pmp))) | |
905 | continue; | |
906 | ||
907 | if ((link->device->class == ATA_DEV_ATAPI) && | |
908 | (link->device->flags & ATA_DFLAG_AN)) | |
909 | ata_scsi_media_change_notify(link->device); | |
910 | } | |
911 | ||
912 | /* If PMP is reporting that PHY status of some | |
913 | * downstream ports has changed, schedule EH. | |
914 | */ | |
915 | if (sntf & (1 << SATA_PMP_CTRL_PORT)) { | |
916 | ata_port_schedule_eh(ap); | |
917 | return 1; | |
918 | } | |
919 | ||
920 | return 0; | |
921 | } | |
922 | } | |
923 | ||
924 | /** | |
925 | * ata_eh_freeze_port - EH helper to freeze port | |
926 | * @ap: ATA port to freeze | |
927 | * | |
928 | * Freeze @ap. | |
929 | * | |
930 | * LOCKING: | |
931 | * None. | |
932 | */ | |
933 | void ata_eh_freeze_port(struct ata_port *ap) | |
934 | { | |
935 | unsigned long flags; | |
936 | ||
937 | if (!ap->ops->error_handler) | |
938 | return; | |
939 | ||
940 | spin_lock_irqsave(ap->lock, flags); | |
941 | __ata_port_freeze(ap); | |
942 | spin_unlock_irqrestore(ap->lock, flags); | |
943 | } | |
944 | ||
945 | /** | |
946 | * ata_port_thaw_port - EH helper to thaw port | |
947 | * @ap: ATA port to thaw | |
948 | * | |
949 | * Thaw frozen port @ap. | |
950 | * | |
951 | * LOCKING: | |
952 | * None. | |
953 | */ | |
954 | void ata_eh_thaw_port(struct ata_port *ap) | |
955 | { | |
956 | unsigned long flags; | |
957 | ||
958 | if (!ap->ops->error_handler) | |
959 | return; | |
960 | ||
961 | spin_lock_irqsave(ap->lock, flags); | |
962 | ||
963 | ap->pflags &= ~ATA_PFLAG_FROZEN; | |
964 | ||
965 | if (ap->ops->thaw) | |
966 | ap->ops->thaw(ap); | |
967 | ||
968 | spin_unlock_irqrestore(ap->lock, flags); | |
969 | ||
970 | DPRINTK("ata%u port thawed\n", ap->print_id); | |
971 | } | |
972 | ||
973 | static void ata_eh_scsidone(struct scsi_cmnd *scmd) | |
974 | { | |
975 | /* nada */ | |
976 | } | |
977 | ||
978 | static void __ata_eh_qc_complete(struct ata_queued_cmd *qc) | |
979 | { | |
980 | struct ata_port *ap = qc->ap; | |
981 | struct scsi_cmnd *scmd = qc->scsicmd; | |
982 | unsigned long flags; | |
983 | ||
984 | spin_lock_irqsave(ap->lock, flags); | |
985 | qc->scsidone = ata_eh_scsidone; | |
986 | __ata_qc_complete(qc); | |
987 | WARN_ON(ata_tag_valid(qc->tag)); | |
988 | spin_unlock_irqrestore(ap->lock, flags); | |
989 | ||
990 | scsi_eh_finish_cmd(scmd, &ap->eh_done_q); | |
991 | } | |
992 | ||
993 | /** | |
994 | * ata_eh_qc_complete - Complete an active ATA command from EH | |
995 | * @qc: Command to complete | |
996 | * | |
997 | * Indicate to the mid and upper layers that an ATA command has | |
998 | * completed. To be used from EH. | |
999 | */ | |
1000 | void ata_eh_qc_complete(struct ata_queued_cmd *qc) | |
1001 | { | |
1002 | struct scsi_cmnd *scmd = qc->scsicmd; | |
1003 | scmd->retries = scmd->allowed; | |
1004 | __ata_eh_qc_complete(qc); | |
1005 | } | |
1006 | ||
1007 | /** | |
1008 | * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH | |
1009 | * @qc: Command to retry | |
1010 | * | |
1011 | * Indicate to the mid and upper layers that an ATA command | |
1012 | * should be retried. To be used from EH. | |
1013 | * | |
1014 | * SCSI midlayer limits the number of retries to scmd->allowed. | |
1015 | * scmd->retries is decremented for commands which get retried | |
1016 | * due to unrelated failures (qc->err_mask is zero). | |
1017 | */ | |
1018 | void ata_eh_qc_retry(struct ata_queued_cmd *qc) | |
1019 | { | |
1020 | struct scsi_cmnd *scmd = qc->scsicmd; | |
1021 | if (!qc->err_mask && scmd->retries) | |
1022 | scmd->retries--; | |
1023 | __ata_eh_qc_complete(qc); | |
1024 | } | |
1025 | ||
1026 | /** | |
1027 | * ata_eh_detach_dev - detach ATA device | |
1028 | * @dev: ATA device to detach | |
1029 | * | |
1030 | * Detach @dev. | |
1031 | * | |
1032 | * LOCKING: | |
1033 | * None. | |
1034 | */ | |
1035 | void ata_eh_detach_dev(struct ata_device *dev) | |
1036 | { | |
1037 | struct ata_link *link = dev->link; | |
1038 | struct ata_port *ap = link->ap; | |
1039 | unsigned long flags; | |
1040 | ||
1041 | ata_dev_disable(dev); | |
1042 | ||
1043 | spin_lock_irqsave(ap->lock, flags); | |
1044 | ||
1045 | dev->flags &= ~ATA_DFLAG_DETACH; | |
1046 | ||
1047 | if (ata_scsi_offline_dev(dev)) { | |
1048 | dev->flags |= ATA_DFLAG_DETACHED; | |
1049 | ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG; | |
1050 | } | |
1051 | ||
1052 | /* clear per-dev EH actions */ | |
1053 | ata_eh_clear_action(link, dev, &link->eh_info, ATA_EH_PERDEV_MASK); | |
1054 | ata_eh_clear_action(link, dev, &link->eh_context.i, ATA_EH_PERDEV_MASK); | |
1055 | ||
1056 | spin_unlock_irqrestore(ap->lock, flags); | |
1057 | } | |
1058 | ||
1059 | /** | |
1060 | * ata_eh_about_to_do - about to perform eh_action | |
1061 | * @link: target ATA link | |
1062 | * @dev: target ATA dev for per-dev action (can be NULL) | |
1063 | * @action: action about to be performed | |
1064 | * | |
1065 | * Called just before performing EH actions to clear related bits | |
1066 | * in @link->eh_info such that eh actions are not unnecessarily | |
1067 | * repeated. | |
1068 | * | |
1069 | * LOCKING: | |
1070 | * None. | |
1071 | */ | |
1072 | void ata_eh_about_to_do(struct ata_link *link, struct ata_device *dev, | |
1073 | unsigned int action) | |
1074 | { | |
1075 | struct ata_port *ap = link->ap; | |
1076 | struct ata_eh_info *ehi = &link->eh_info; | |
1077 | struct ata_eh_context *ehc = &link->eh_context; | |
1078 | unsigned long flags; | |
1079 | ||
1080 | spin_lock_irqsave(ap->lock, flags); | |
1081 | ||
1082 | ata_eh_clear_action(link, dev, ehi, action); | |
1083 | ||
1084 | if (!(ehc->i.flags & ATA_EHI_QUIET)) | |
1085 | ap->pflags |= ATA_PFLAG_RECOVERED; | |
1086 | ||
1087 | spin_unlock_irqrestore(ap->lock, flags); | |
1088 | } | |
1089 | ||
1090 | /** | |
1091 | * ata_eh_done - EH action complete | |
1092 | * @ap: target ATA port | |
1093 | * @dev: target ATA dev for per-dev action (can be NULL) | |
1094 | * @action: action just completed | |
1095 | * | |
1096 | * Called right after performing EH actions to clear related bits | |
1097 | * in @link->eh_context. | |
1098 | * | |
1099 | * LOCKING: | |
1100 | * None. | |
1101 | */ | |
1102 | void ata_eh_done(struct ata_link *link, struct ata_device *dev, | |
1103 | unsigned int action) | |
1104 | { | |
1105 | struct ata_eh_context *ehc = &link->eh_context; | |
1106 | ||
1107 | ata_eh_clear_action(link, dev, &ehc->i, action); | |
1108 | } | |
1109 | ||
1110 | /** | |
1111 | * ata_err_string - convert err_mask to descriptive string | |
1112 | * @err_mask: error mask to convert to string | |
1113 | * | |
1114 | * Convert @err_mask to descriptive string. Errors are | |
1115 | * prioritized according to severity and only the most severe | |
1116 | * error is reported. | |
1117 | * | |
1118 | * LOCKING: | |
1119 | * None. | |
1120 | * | |
1121 | * RETURNS: | |
1122 | * Descriptive string for @err_mask | |
1123 | */ | |
1124 | static const char *ata_err_string(unsigned int err_mask) | |
1125 | { | |
1126 | if (err_mask & AC_ERR_HOST_BUS) | |
1127 | return "host bus error"; | |
1128 | if (err_mask & AC_ERR_ATA_BUS) | |
1129 | return "ATA bus error"; | |
1130 | if (err_mask & AC_ERR_TIMEOUT) | |
1131 | return "timeout"; | |
1132 | if (err_mask & AC_ERR_HSM) | |
1133 | return "HSM violation"; | |
1134 | if (err_mask & AC_ERR_SYSTEM) | |
1135 | return "internal error"; | |
1136 | if (err_mask & AC_ERR_MEDIA) | |
1137 | return "media error"; | |
1138 | if (err_mask & AC_ERR_INVALID) | |
1139 | return "invalid argument"; | |
1140 | if (err_mask & AC_ERR_DEV) | |
1141 | return "device error"; | |
1142 | return "unknown error"; | |
1143 | } | |
1144 | ||
1145 | /** | |
1146 | * ata_read_log_page - read a specific log page | |
1147 | * @dev: target device | |
1148 | * @page: page to read | |
1149 | * @buf: buffer to store read page | |
1150 | * @sectors: number of sectors to read | |
1151 | * | |
1152 | * Read log page using READ_LOG_EXT command. | |
1153 | * | |
1154 | * LOCKING: | |
1155 | * Kernel thread context (may sleep). | |
1156 | * | |
1157 | * RETURNS: | |
1158 | * 0 on success, AC_ERR_* mask otherwise. | |
1159 | */ | |
1160 | static unsigned int ata_read_log_page(struct ata_device *dev, | |
1161 | u8 page, void *buf, unsigned int sectors) | |
1162 | { | |
1163 | struct ata_taskfile tf; | |
1164 | unsigned int err_mask; | |
1165 | ||
1166 | DPRINTK("read log page - page %d\n", page); | |
1167 | ||
1168 | ata_tf_init(dev, &tf); | |
1169 | tf.command = ATA_CMD_READ_LOG_EXT; | |
1170 | tf.lbal = page; | |
1171 | tf.nsect = sectors; | |
1172 | tf.hob_nsect = sectors >> 8; | |
1173 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_LBA48 | ATA_TFLAG_DEVICE; | |
1174 | tf.protocol = ATA_PROT_PIO; | |
1175 | ||
1176 | err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE, | |
1177 | buf, sectors * ATA_SECT_SIZE, 0); | |
1178 | ||
1179 | DPRINTK("EXIT, err_mask=%x\n", err_mask); | |
1180 | return err_mask; | |
1181 | } | |
1182 | ||
1183 | /** | |
1184 | * ata_eh_read_log_10h - Read log page 10h for NCQ error details | |
1185 | * @dev: Device to read log page 10h from | |
1186 | * @tag: Resulting tag of the failed command | |
1187 | * @tf: Resulting taskfile registers of the failed command | |
1188 | * | |
1189 | * Read log page 10h to obtain NCQ error details and clear error | |
1190 | * condition. | |
1191 | * | |
1192 | * LOCKING: | |
1193 | * Kernel thread context (may sleep). | |
1194 | * | |
1195 | * RETURNS: | |
1196 | * 0 on success, -errno otherwise. | |
1197 | */ | |
1198 | static int ata_eh_read_log_10h(struct ata_device *dev, | |
1199 | int *tag, struct ata_taskfile *tf) | |
1200 | { | |
1201 | u8 *buf = dev->link->ap->sector_buf; | |
1202 | unsigned int err_mask; | |
1203 | u8 csum; | |
1204 | int i; | |
1205 | ||
1206 | err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, buf, 1); | |
1207 | if (err_mask) | |
1208 | return -EIO; | |
1209 | ||
1210 | csum = 0; | |
1211 | for (i = 0; i < ATA_SECT_SIZE; i++) | |
1212 | csum += buf[i]; | |
1213 | if (csum) | |
1214 | ata_dev_printk(dev, KERN_WARNING, | |
1215 | "invalid checksum 0x%x on log page 10h\n", csum); | |
1216 | ||
1217 | if (buf[0] & 0x80) | |
1218 | return -ENOENT; | |
1219 | ||
1220 | *tag = buf[0] & 0x1f; | |
1221 | ||
1222 | tf->command = buf[2]; | |
1223 | tf->feature = buf[3]; | |
1224 | tf->lbal = buf[4]; | |
1225 | tf->lbam = buf[5]; | |
1226 | tf->lbah = buf[6]; | |
1227 | tf->device = buf[7]; | |
1228 | tf->hob_lbal = buf[8]; | |
1229 | tf->hob_lbam = buf[9]; | |
1230 | tf->hob_lbah = buf[10]; | |
1231 | tf->nsect = buf[12]; | |
1232 | tf->hob_nsect = buf[13]; | |
1233 | ||
1234 | return 0; | |
1235 | } | |
1236 | ||
1237 | /** | |
1238 | * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE | |
1239 | * @dev: device to perform REQUEST_SENSE to | |
1240 | * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long) | |
1241 | * | |
1242 | * Perform ATAPI REQUEST_SENSE after the device reported CHECK | |
1243 | * SENSE. This function is EH helper. | |
1244 | * | |
1245 | * LOCKING: | |
1246 | * Kernel thread context (may sleep). | |
1247 | * | |
1248 | * RETURNS: | |
1249 | * 0 on success, AC_ERR_* mask on failure | |
1250 | */ | |
1251 | static unsigned int atapi_eh_request_sense(struct ata_queued_cmd *qc) | |
1252 | { | |
1253 | struct ata_device *dev = qc->dev; | |
1254 | unsigned char *sense_buf = qc->scsicmd->sense_buffer; | |
1255 | struct ata_port *ap = dev->link->ap; | |
1256 | struct ata_taskfile tf; | |
1257 | u8 cdb[ATAPI_CDB_LEN]; | |
1258 | ||
1259 | DPRINTK("ATAPI request sense\n"); | |
1260 | ||
1261 | /* FIXME: is this needed? */ | |
1262 | memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE); | |
1263 | ||
1264 | /* initialize sense_buf with the error register, | |
1265 | * for the case where they are -not- overwritten | |
1266 | */ | |
1267 | sense_buf[0] = 0x70; | |
1268 | sense_buf[2] = qc->result_tf.feature >> 4; | |
1269 | ||
1270 | /* some devices time out if garbage left in tf */ | |
1271 | ata_tf_init(dev, &tf); | |
1272 | ||
1273 | memset(cdb, 0, ATAPI_CDB_LEN); | |
1274 | cdb[0] = REQUEST_SENSE; | |
1275 | cdb[4] = SCSI_SENSE_BUFFERSIZE; | |
1276 | ||
1277 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; | |
1278 | tf.command = ATA_CMD_PACKET; | |
1279 | ||
1280 | /* is it pointless to prefer PIO for "safety reasons"? */ | |
1281 | if (ap->flags & ATA_FLAG_PIO_DMA) { | |
1282 | tf.protocol = ATAPI_PROT_DMA; | |
1283 | tf.feature |= ATAPI_PKT_DMA; | |
1284 | } else { | |
1285 | tf.protocol = ATAPI_PROT_PIO; | |
1286 | tf.lbam = SCSI_SENSE_BUFFERSIZE; | |
1287 | tf.lbah = 0; | |
1288 | } | |
1289 | ||
1290 | return ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE, | |
1291 | sense_buf, SCSI_SENSE_BUFFERSIZE, 0); | |
1292 | } | |
1293 | ||
1294 | /** | |
1295 | * ata_eh_analyze_serror - analyze SError for a failed port | |
1296 | * @link: ATA link to analyze SError for | |
1297 | * | |
1298 | * Analyze SError if available and further determine cause of | |
1299 | * failure. | |
1300 | * | |
1301 | * LOCKING: | |
1302 | * None. | |
1303 | */ | |
1304 | static void ata_eh_analyze_serror(struct ata_link *link) | |
1305 | { | |
1306 | struct ata_eh_context *ehc = &link->eh_context; | |
1307 | u32 serror = ehc->i.serror; | |
1308 | unsigned int err_mask = 0, action = 0; | |
1309 | u32 hotplug_mask; | |
1310 | ||
1311 | if (serror & SERR_PERSISTENT) { | |
1312 | err_mask |= AC_ERR_ATA_BUS; | |
1313 | action |= ATA_EH_RESET; | |
1314 | } | |
1315 | if (serror & | |
1316 | (SERR_DATA_RECOVERED | SERR_COMM_RECOVERED | SERR_DATA)) { | |
1317 | err_mask |= AC_ERR_ATA_BUS; | |
1318 | action |= ATA_EH_RESET; | |
1319 | } | |
1320 | if (serror & SERR_PROTOCOL) { | |
1321 | err_mask |= AC_ERR_HSM; | |
1322 | action |= ATA_EH_RESET; | |
1323 | } | |
1324 | if (serror & SERR_INTERNAL) { | |
1325 | err_mask |= AC_ERR_SYSTEM; | |
1326 | action |= ATA_EH_RESET; | |
1327 | } | |
1328 | ||
1329 | /* Determine whether a hotplug event has occurred. Both | |
1330 | * SError.N/X are considered hotplug events for enabled or | |
1331 | * host links. For disabled PMP links, only N bit is | |
1332 | * considered as X bit is left at 1 for link plugging. | |
1333 | */ | |
1334 | hotplug_mask = 0; | |
1335 | ||
1336 | if (!(link->flags & ATA_LFLAG_DISABLED) || ata_is_host_link(link)) | |
1337 | hotplug_mask = SERR_PHYRDY_CHG | SERR_DEV_XCHG; | |
1338 | else | |
1339 | hotplug_mask = SERR_PHYRDY_CHG; | |
1340 | ||
1341 | if (serror & hotplug_mask) | |
1342 | ata_ehi_hotplugged(&ehc->i); | |
1343 | ||
1344 | ehc->i.err_mask |= err_mask; | |
1345 | ehc->i.action |= action; | |
1346 | } | |
1347 | ||
1348 | /** | |
1349 | * ata_eh_analyze_ncq_error - analyze NCQ error | |
1350 | * @link: ATA link to analyze NCQ error for | |
1351 | * | |
1352 | * Read log page 10h, determine the offending qc and acquire | |
1353 | * error status TF. For NCQ device errors, all LLDDs have to do | |
1354 | * is setting AC_ERR_DEV in ehi->err_mask. This function takes | |
1355 | * care of the rest. | |
1356 | * | |
1357 | * LOCKING: | |
1358 | * Kernel thread context (may sleep). | |
1359 | */ | |
1360 | void ata_eh_analyze_ncq_error(struct ata_link *link) | |
1361 | { | |
1362 | struct ata_port *ap = link->ap; | |
1363 | struct ata_eh_context *ehc = &link->eh_context; | |
1364 | struct ata_device *dev = link->device; | |
1365 | struct ata_queued_cmd *qc; | |
1366 | struct ata_taskfile tf; | |
1367 | int tag, rc; | |
1368 | ||
1369 | /* if frozen, we can't do much */ | |
1370 | if (ap->pflags & ATA_PFLAG_FROZEN) | |
1371 | return; | |
1372 | ||
1373 | /* is it NCQ device error? */ | |
1374 | if (!link->sactive || !(ehc->i.err_mask & AC_ERR_DEV)) | |
1375 | return; | |
1376 | ||
1377 | /* has LLDD analyzed already? */ | |
1378 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1379 | qc = __ata_qc_from_tag(ap, tag); | |
1380 | ||
1381 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
1382 | continue; | |
1383 | ||
1384 | if (qc->err_mask) | |
1385 | return; | |
1386 | } | |
1387 | ||
1388 | /* okay, this error is ours */ | |
1389 | rc = ata_eh_read_log_10h(dev, &tag, &tf); | |
1390 | if (rc) { | |
1391 | ata_link_printk(link, KERN_ERR, "failed to read log page 10h " | |
1392 | "(errno=%d)\n", rc); | |
1393 | return; | |
1394 | } | |
1395 | ||
1396 | if (!(link->sactive & (1 << tag))) { | |
1397 | ata_link_printk(link, KERN_ERR, "log page 10h reported " | |
1398 | "inactive tag %d\n", tag); | |
1399 | return; | |
1400 | } | |
1401 | ||
1402 | /* we've got the perpetrator, condemn it */ | |
1403 | qc = __ata_qc_from_tag(ap, tag); | |
1404 | memcpy(&qc->result_tf, &tf, sizeof(tf)); | |
1405 | qc->result_tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_LBA | ATA_TFLAG_LBA48; | |
1406 | qc->err_mask |= AC_ERR_DEV | AC_ERR_NCQ; | |
1407 | ehc->i.err_mask &= ~AC_ERR_DEV; | |
1408 | } | |
1409 | ||
1410 | /** | |
1411 | * ata_eh_analyze_tf - analyze taskfile of a failed qc | |
1412 | * @qc: qc to analyze | |
1413 | * @tf: Taskfile registers to analyze | |
1414 | * | |
1415 | * Analyze taskfile of @qc and further determine cause of | |
1416 | * failure. This function also requests ATAPI sense data if | |
1417 | * avaliable. | |
1418 | * | |
1419 | * LOCKING: | |
1420 | * Kernel thread context (may sleep). | |
1421 | * | |
1422 | * RETURNS: | |
1423 | * Determined recovery action | |
1424 | */ | |
1425 | static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd *qc, | |
1426 | const struct ata_taskfile *tf) | |
1427 | { | |
1428 | unsigned int tmp, action = 0; | |
1429 | u8 stat = tf->command, err = tf->feature; | |
1430 | ||
1431 | if ((stat & (ATA_BUSY | ATA_DRQ | ATA_DRDY)) != ATA_DRDY) { | |
1432 | qc->err_mask |= AC_ERR_HSM; | |
1433 | return ATA_EH_RESET; | |
1434 | } | |
1435 | ||
1436 | if (stat & (ATA_ERR | ATA_DF)) | |
1437 | qc->err_mask |= AC_ERR_DEV; | |
1438 | else | |
1439 | return 0; | |
1440 | ||
1441 | switch (qc->dev->class) { | |
1442 | case ATA_DEV_ATA: | |
1443 | if (err & ATA_ICRC) | |
1444 | qc->err_mask |= AC_ERR_ATA_BUS; | |
1445 | if (err & ATA_UNC) | |
1446 | qc->err_mask |= AC_ERR_MEDIA; | |
1447 | if (err & ATA_IDNF) | |
1448 | qc->err_mask |= AC_ERR_INVALID; | |
1449 | break; | |
1450 | ||
1451 | case ATA_DEV_ATAPI: | |
1452 | if (!(qc->ap->pflags & ATA_PFLAG_FROZEN)) { | |
1453 | tmp = atapi_eh_request_sense(qc); | |
1454 | if (!tmp) { | |
1455 | /* ATA_QCFLAG_SENSE_VALID is used to | |
1456 | * tell atapi_qc_complete() that sense | |
1457 | * data is already valid. | |
1458 | * | |
1459 | * TODO: interpret sense data and set | |
1460 | * appropriate err_mask. | |
1461 | */ | |
1462 | qc->flags |= ATA_QCFLAG_SENSE_VALID; | |
1463 | } else | |
1464 | qc->err_mask |= tmp; | |
1465 | } | |
1466 | } | |
1467 | ||
1468 | if (qc->err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT | AC_ERR_ATA_BUS)) | |
1469 | action |= ATA_EH_RESET; | |
1470 | ||
1471 | return action; | |
1472 | } | |
1473 | ||
1474 | static int ata_eh_categorize_error(unsigned int eflags, unsigned int err_mask, | |
1475 | int *xfer_ok) | |
1476 | { | |
1477 | int base = 0; | |
1478 | ||
1479 | if (!(eflags & ATA_EFLAG_DUBIOUS_XFER)) | |
1480 | *xfer_ok = 1; | |
1481 | ||
1482 | if (!*xfer_ok) | |
1483 | base = ATA_ECAT_DUBIOUS_NONE; | |
1484 | ||
1485 | if (err_mask & AC_ERR_ATA_BUS) | |
1486 | return base + ATA_ECAT_ATA_BUS; | |
1487 | ||
1488 | if (err_mask & AC_ERR_TIMEOUT) | |
1489 | return base + ATA_ECAT_TOUT_HSM; | |
1490 | ||
1491 | if (eflags & ATA_EFLAG_IS_IO) { | |
1492 | if (err_mask & AC_ERR_HSM) | |
1493 | return base + ATA_ECAT_TOUT_HSM; | |
1494 | if ((err_mask & | |
1495 | (AC_ERR_DEV|AC_ERR_MEDIA|AC_ERR_INVALID)) == AC_ERR_DEV) | |
1496 | return base + ATA_ECAT_UNK_DEV; | |
1497 | } | |
1498 | ||
1499 | return 0; | |
1500 | } | |
1501 | ||
1502 | struct speed_down_verdict_arg { | |
1503 | u64 since; | |
1504 | int xfer_ok; | |
1505 | int nr_errors[ATA_ECAT_NR]; | |
1506 | }; | |
1507 | ||
1508 | static int speed_down_verdict_cb(struct ata_ering_entry *ent, void *void_arg) | |
1509 | { | |
1510 | struct speed_down_verdict_arg *arg = void_arg; | |
1511 | int cat; | |
1512 | ||
1513 | if (ent->timestamp < arg->since) | |
1514 | return -1; | |
1515 | ||
1516 | cat = ata_eh_categorize_error(ent->eflags, ent->err_mask, | |
1517 | &arg->xfer_ok); | |
1518 | arg->nr_errors[cat]++; | |
1519 | ||
1520 | return 0; | |
1521 | } | |
1522 | ||
1523 | /** | |
1524 | * ata_eh_speed_down_verdict - Determine speed down verdict | |
1525 | * @dev: Device of interest | |
1526 | * | |
1527 | * This function examines error ring of @dev and determines | |
1528 | * whether NCQ needs to be turned off, transfer speed should be | |
1529 | * stepped down, or falling back to PIO is necessary. | |
1530 | * | |
1531 | * ECAT_ATA_BUS : ATA_BUS error for any command | |
1532 | * | |
1533 | * ECAT_TOUT_HSM : TIMEOUT for any command or HSM violation for | |
1534 | * IO commands | |
1535 | * | |
1536 | * ECAT_UNK_DEV : Unknown DEV error for IO commands | |
1537 | * | |
1538 | * ECAT_DUBIOUS_* : Identical to above three but occurred while | |
1539 | * data transfer hasn't been verified. | |
1540 | * | |
1541 | * Verdicts are | |
1542 | * | |
1543 | * NCQ_OFF : Turn off NCQ. | |
1544 | * | |
1545 | * SPEED_DOWN : Speed down transfer speed but don't fall back | |
1546 | * to PIO. | |
1547 | * | |
1548 | * FALLBACK_TO_PIO : Fall back to PIO. | |
1549 | * | |
1550 | * Even if multiple verdicts are returned, only one action is | |
1551 | * taken per error. An action triggered by non-DUBIOUS errors | |
1552 | * clears ering, while one triggered by DUBIOUS_* errors doesn't. | |
1553 | * This is to expedite speed down decisions right after device is | |
1554 | * initially configured. | |
1555 | * | |
1556 | * The followings are speed down rules. #1 and #2 deal with | |
1557 | * DUBIOUS errors. | |
1558 | * | |
1559 | * 1. If more than one DUBIOUS_ATA_BUS or DUBIOUS_TOUT_HSM errors | |
1560 | * occurred during last 5 mins, SPEED_DOWN and FALLBACK_TO_PIO. | |
1561 | * | |
1562 | * 2. If more than one DUBIOUS_TOUT_HSM or DUBIOUS_UNK_DEV errors | |
1563 | * occurred during last 5 mins, NCQ_OFF. | |
1564 | * | |
1565 | * 3. If more than 8 ATA_BUS, TOUT_HSM or UNK_DEV errors | |
1566 | * ocurred during last 5 mins, FALLBACK_TO_PIO | |
1567 | * | |
1568 | * 4. If more than 3 TOUT_HSM or UNK_DEV errors occurred | |
1569 | * during last 10 mins, NCQ_OFF. | |
1570 | * | |
1571 | * 5. If more than 3 ATA_BUS or TOUT_HSM errors, or more than 6 | |
1572 | * UNK_DEV errors occurred during last 10 mins, SPEED_DOWN. | |
1573 | * | |
1574 | * LOCKING: | |
1575 | * Inherited from caller. | |
1576 | * | |
1577 | * RETURNS: | |
1578 | * OR of ATA_EH_SPDN_* flags. | |
1579 | */ | |
1580 | static unsigned int ata_eh_speed_down_verdict(struct ata_device *dev) | |
1581 | { | |
1582 | const u64 j5mins = 5LLU * 60 * HZ, j10mins = 10LLU * 60 * HZ; | |
1583 | u64 j64 = get_jiffies_64(); | |
1584 | struct speed_down_verdict_arg arg; | |
1585 | unsigned int verdict = 0; | |
1586 | ||
1587 | /* scan past 5 mins of error history */ | |
1588 | memset(&arg, 0, sizeof(arg)); | |
1589 | arg.since = j64 - min(j64, j5mins); | |
1590 | ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg); | |
1591 | ||
1592 | if (arg.nr_errors[ATA_ECAT_DUBIOUS_ATA_BUS] + | |
1593 | arg.nr_errors[ATA_ECAT_DUBIOUS_TOUT_HSM] > 1) | |
1594 | verdict |= ATA_EH_SPDN_SPEED_DOWN | | |
1595 | ATA_EH_SPDN_FALLBACK_TO_PIO | ATA_EH_SPDN_KEEP_ERRORS; | |
1596 | ||
1597 | if (arg.nr_errors[ATA_ECAT_DUBIOUS_TOUT_HSM] + | |
1598 | arg.nr_errors[ATA_ECAT_DUBIOUS_UNK_DEV] > 1) | |
1599 | verdict |= ATA_EH_SPDN_NCQ_OFF | ATA_EH_SPDN_KEEP_ERRORS; | |
1600 | ||
1601 | if (arg.nr_errors[ATA_ECAT_ATA_BUS] + | |
1602 | arg.nr_errors[ATA_ECAT_TOUT_HSM] + | |
1603 | arg.nr_errors[ATA_ECAT_UNK_DEV] > 6) | |
1604 | verdict |= ATA_EH_SPDN_FALLBACK_TO_PIO; | |
1605 | ||
1606 | /* scan past 10 mins of error history */ | |
1607 | memset(&arg, 0, sizeof(arg)); | |
1608 | arg.since = j64 - min(j64, j10mins); | |
1609 | ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg); | |
1610 | ||
1611 | if (arg.nr_errors[ATA_ECAT_TOUT_HSM] + | |
1612 | arg.nr_errors[ATA_ECAT_UNK_DEV] > 3) | |
1613 | verdict |= ATA_EH_SPDN_NCQ_OFF; | |
1614 | ||
1615 | if (arg.nr_errors[ATA_ECAT_ATA_BUS] + | |
1616 | arg.nr_errors[ATA_ECAT_TOUT_HSM] > 3 || | |
1617 | arg.nr_errors[ATA_ECAT_UNK_DEV] > 6) | |
1618 | verdict |= ATA_EH_SPDN_SPEED_DOWN; | |
1619 | ||
1620 | return verdict; | |
1621 | } | |
1622 | ||
1623 | /** | |
1624 | * ata_eh_speed_down - record error and speed down if necessary | |
1625 | * @dev: Failed device | |
1626 | * @eflags: mask of ATA_EFLAG_* flags | |
1627 | * @err_mask: err_mask of the error | |
1628 | * | |
1629 | * Record error and examine error history to determine whether | |
1630 | * adjusting transmission speed is necessary. It also sets | |
1631 | * transmission limits appropriately if such adjustment is | |
1632 | * necessary. | |
1633 | * | |
1634 | * LOCKING: | |
1635 | * Kernel thread context (may sleep). | |
1636 | * | |
1637 | * RETURNS: | |
1638 | * Determined recovery action. | |
1639 | */ | |
1640 | static unsigned int ata_eh_speed_down(struct ata_device *dev, | |
1641 | unsigned int eflags, unsigned int err_mask) | |
1642 | { | |
1643 | struct ata_link *link = dev->link; | |
1644 | int xfer_ok = 0; | |
1645 | unsigned int verdict; | |
1646 | unsigned int action = 0; | |
1647 | ||
1648 | /* don't bother if Cat-0 error */ | |
1649 | if (ata_eh_categorize_error(eflags, err_mask, &xfer_ok) == 0) | |
1650 | return 0; | |
1651 | ||
1652 | /* record error and determine whether speed down is necessary */ | |
1653 | ata_ering_record(&dev->ering, eflags, err_mask); | |
1654 | verdict = ata_eh_speed_down_verdict(dev); | |
1655 | ||
1656 | /* turn off NCQ? */ | |
1657 | if ((verdict & ATA_EH_SPDN_NCQ_OFF) && | |
1658 | (dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ | | |
1659 | ATA_DFLAG_NCQ_OFF)) == ATA_DFLAG_NCQ) { | |
1660 | dev->flags |= ATA_DFLAG_NCQ_OFF; | |
1661 | ata_dev_printk(dev, KERN_WARNING, | |
1662 | "NCQ disabled due to excessive errors\n"); | |
1663 | goto done; | |
1664 | } | |
1665 | ||
1666 | /* speed down? */ | |
1667 | if (verdict & ATA_EH_SPDN_SPEED_DOWN) { | |
1668 | /* speed down SATA link speed if possible */ | |
1669 | if (sata_down_spd_limit(link) == 0) { | |
1670 | action |= ATA_EH_RESET; | |
1671 | goto done; | |
1672 | } | |
1673 | ||
1674 | /* lower transfer mode */ | |
1675 | if (dev->spdn_cnt < 2) { | |
1676 | static const int dma_dnxfer_sel[] = | |
1677 | { ATA_DNXFER_DMA, ATA_DNXFER_40C }; | |
1678 | static const int pio_dnxfer_sel[] = | |
1679 | { ATA_DNXFER_PIO, ATA_DNXFER_FORCE_PIO0 }; | |
1680 | int sel; | |
1681 | ||
1682 | if (dev->xfer_shift != ATA_SHIFT_PIO) | |
1683 | sel = dma_dnxfer_sel[dev->spdn_cnt]; | |
1684 | else | |
1685 | sel = pio_dnxfer_sel[dev->spdn_cnt]; | |
1686 | ||
1687 | dev->spdn_cnt++; | |
1688 | ||
1689 | if (ata_down_xfermask_limit(dev, sel) == 0) { | |
1690 | action |= ATA_EH_RESET; | |
1691 | goto done; | |
1692 | } | |
1693 | } | |
1694 | } | |
1695 | ||
1696 | /* Fall back to PIO? Slowing down to PIO is meaningless for | |
1697 | * SATA ATA devices. Consider it only for PATA and SATAPI. | |
1698 | */ | |
1699 | if ((verdict & ATA_EH_SPDN_FALLBACK_TO_PIO) && (dev->spdn_cnt >= 2) && | |
1700 | (link->ap->cbl != ATA_CBL_SATA || dev->class == ATA_DEV_ATAPI) && | |
1701 | (dev->xfer_shift != ATA_SHIFT_PIO)) { | |
1702 | if (ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO) == 0) { | |
1703 | dev->spdn_cnt = 0; | |
1704 | action |= ATA_EH_RESET; | |
1705 | goto done; | |
1706 | } | |
1707 | } | |
1708 | ||
1709 | return 0; | |
1710 | done: | |
1711 | /* device has been slowed down, blow error history */ | |
1712 | if (!(verdict & ATA_EH_SPDN_KEEP_ERRORS)) | |
1713 | ata_ering_clear(&dev->ering); | |
1714 | return action; | |
1715 | } | |
1716 | ||
1717 | /** | |
1718 | * ata_eh_link_autopsy - analyze error and determine recovery action | |
1719 | * @link: host link to perform autopsy on | |
1720 | * | |
1721 | * Analyze why @link failed and determine which recovery actions | |
1722 | * are needed. This function also sets more detailed AC_ERR_* | |
1723 | * values and fills sense data for ATAPI CHECK SENSE. | |
1724 | * | |
1725 | * LOCKING: | |
1726 | * Kernel thread context (may sleep). | |
1727 | */ | |
1728 | static void ata_eh_link_autopsy(struct ata_link *link) | |
1729 | { | |
1730 | struct ata_port *ap = link->ap; | |
1731 | struct ata_eh_context *ehc = &link->eh_context; | |
1732 | struct ata_device *dev; | |
1733 | unsigned int all_err_mask = 0, eflags = 0; | |
1734 | int tag; | |
1735 | u32 serror; | |
1736 | int rc; | |
1737 | ||
1738 | DPRINTK("ENTER\n"); | |
1739 | ||
1740 | if (ehc->i.flags & ATA_EHI_NO_AUTOPSY) | |
1741 | return; | |
1742 | ||
1743 | /* obtain and analyze SError */ | |
1744 | rc = sata_scr_read(link, SCR_ERROR, &serror); | |
1745 | if (rc == 0) { | |
1746 | ehc->i.serror |= serror; | |
1747 | ata_eh_analyze_serror(link); | |
1748 | } else if (rc != -EOPNOTSUPP) { | |
1749 | /* SError read failed, force reset and probing */ | |
1750 | ehc->i.probe_mask |= ATA_ALL_DEVICES; | |
1751 | ehc->i.action |= ATA_EH_RESET; | |
1752 | ehc->i.err_mask |= AC_ERR_OTHER; | |
1753 | } | |
1754 | ||
1755 | /* analyze NCQ failure */ | |
1756 | ata_eh_analyze_ncq_error(link); | |
1757 | ||
1758 | /* any real error trumps AC_ERR_OTHER */ | |
1759 | if (ehc->i.err_mask & ~AC_ERR_OTHER) | |
1760 | ehc->i.err_mask &= ~AC_ERR_OTHER; | |
1761 | ||
1762 | all_err_mask |= ehc->i.err_mask; | |
1763 | ||
1764 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1765 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
1766 | ||
1767 | if (!(qc->flags & ATA_QCFLAG_FAILED) || qc->dev->link != link) | |
1768 | continue; | |
1769 | ||
1770 | /* inherit upper level err_mask */ | |
1771 | qc->err_mask |= ehc->i.err_mask; | |
1772 | ||
1773 | /* analyze TF */ | |
1774 | ehc->i.action |= ata_eh_analyze_tf(qc, &qc->result_tf); | |
1775 | ||
1776 | /* DEV errors are probably spurious in case of ATA_BUS error */ | |
1777 | if (qc->err_mask & AC_ERR_ATA_BUS) | |
1778 | qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_MEDIA | | |
1779 | AC_ERR_INVALID); | |
1780 | ||
1781 | /* any real error trumps unknown error */ | |
1782 | if (qc->err_mask & ~AC_ERR_OTHER) | |
1783 | qc->err_mask &= ~AC_ERR_OTHER; | |
1784 | ||
1785 | /* SENSE_VALID trumps dev/unknown error and revalidation */ | |
1786 | if (qc->flags & ATA_QCFLAG_SENSE_VALID) | |
1787 | qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_OTHER); | |
1788 | ||
1789 | /* determine whether the command is worth retrying */ | |
1790 | if (!(qc->err_mask & AC_ERR_INVALID) && | |
1791 | ((qc->flags & ATA_QCFLAG_IO) || qc->err_mask != AC_ERR_DEV)) | |
1792 | qc->flags |= ATA_QCFLAG_RETRY; | |
1793 | ||
1794 | /* accumulate error info */ | |
1795 | ehc->i.dev = qc->dev; | |
1796 | all_err_mask |= qc->err_mask; | |
1797 | if (qc->flags & ATA_QCFLAG_IO) | |
1798 | eflags |= ATA_EFLAG_IS_IO; | |
1799 | } | |
1800 | ||
1801 | /* enforce default EH actions */ | |
1802 | if (ap->pflags & ATA_PFLAG_FROZEN || | |
1803 | all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT)) | |
1804 | ehc->i.action |= ATA_EH_RESET; | |
1805 | else if (((eflags & ATA_EFLAG_IS_IO) && all_err_mask) || | |
1806 | (!(eflags & ATA_EFLAG_IS_IO) && (all_err_mask & ~AC_ERR_DEV))) | |
1807 | ehc->i.action |= ATA_EH_REVALIDATE; | |
1808 | ||
1809 | /* If we have offending qcs and the associated failed device, | |
1810 | * perform per-dev EH action only on the offending device. | |
1811 | */ | |
1812 | if (ehc->i.dev) { | |
1813 | ehc->i.dev_action[ehc->i.dev->devno] |= | |
1814 | ehc->i.action & ATA_EH_PERDEV_MASK; | |
1815 | ehc->i.action &= ~ATA_EH_PERDEV_MASK; | |
1816 | } | |
1817 | ||
1818 | /* propagate timeout to host link */ | |
1819 | if ((all_err_mask & AC_ERR_TIMEOUT) && !ata_is_host_link(link)) | |
1820 | ap->link.eh_context.i.err_mask |= AC_ERR_TIMEOUT; | |
1821 | ||
1822 | /* record error and consider speeding down */ | |
1823 | dev = ehc->i.dev; | |
1824 | if (!dev && ((ata_link_max_devices(link) == 1 && | |
1825 | ata_dev_enabled(link->device)))) | |
1826 | dev = link->device; | |
1827 | ||
1828 | if (dev) { | |
1829 | if (dev->flags & ATA_DFLAG_DUBIOUS_XFER) | |
1830 | eflags |= ATA_EFLAG_DUBIOUS_XFER; | |
1831 | ehc->i.action |= ata_eh_speed_down(dev, eflags, all_err_mask); | |
1832 | } | |
1833 | ||
1834 | DPRINTK("EXIT\n"); | |
1835 | } | |
1836 | ||
1837 | /** | |
1838 | * ata_eh_autopsy - analyze error and determine recovery action | |
1839 | * @ap: host port to perform autopsy on | |
1840 | * | |
1841 | * Analyze all links of @ap and determine why they failed and | |
1842 | * which recovery actions are needed. | |
1843 | * | |
1844 | * LOCKING: | |
1845 | * Kernel thread context (may sleep). | |
1846 | */ | |
1847 | void ata_eh_autopsy(struct ata_port *ap) | |
1848 | { | |
1849 | struct ata_link *link; | |
1850 | ||
1851 | ata_port_for_each_link(link, ap) | |
1852 | ata_eh_link_autopsy(link); | |
1853 | ||
1854 | /* Autopsy of fanout ports can affect host link autopsy. | |
1855 | * Perform host link autopsy last. | |
1856 | */ | |
1857 | if (sata_pmp_attached(ap)) | |
1858 | ata_eh_link_autopsy(&ap->link); | |
1859 | } | |
1860 | ||
1861 | /** | |
1862 | * ata_eh_link_report - report error handling to user | |
1863 | * @link: ATA link EH is going on | |
1864 | * | |
1865 | * Report EH to user. | |
1866 | * | |
1867 | * LOCKING: | |
1868 | * None. | |
1869 | */ | |
1870 | static void ata_eh_link_report(struct ata_link *link) | |
1871 | { | |
1872 | struct ata_port *ap = link->ap; | |
1873 | struct ata_eh_context *ehc = &link->eh_context; | |
1874 | const char *frozen, *desc; | |
1875 | char tries_buf[6]; | |
1876 | int tag, nr_failed = 0; | |
1877 | ||
1878 | if (ehc->i.flags & ATA_EHI_QUIET) | |
1879 | return; | |
1880 | ||
1881 | desc = NULL; | |
1882 | if (ehc->i.desc[0] != '\0') | |
1883 | desc = ehc->i.desc; | |
1884 | ||
1885 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1886 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
1887 | ||
1888 | if (!(qc->flags & ATA_QCFLAG_FAILED) || qc->dev->link != link || | |
1889 | ((qc->flags & ATA_QCFLAG_QUIET) && | |
1890 | qc->err_mask == AC_ERR_DEV)) | |
1891 | continue; | |
1892 | if (qc->flags & ATA_QCFLAG_SENSE_VALID && !qc->err_mask) | |
1893 | continue; | |
1894 | ||
1895 | nr_failed++; | |
1896 | } | |
1897 | ||
1898 | if (!nr_failed && !ehc->i.err_mask) | |
1899 | return; | |
1900 | ||
1901 | frozen = ""; | |
1902 | if (ap->pflags & ATA_PFLAG_FROZEN) | |
1903 | frozen = " frozen"; | |
1904 | ||
1905 | memset(tries_buf, 0, sizeof(tries_buf)); | |
1906 | if (ap->eh_tries < ATA_EH_MAX_TRIES) | |
1907 | snprintf(tries_buf, sizeof(tries_buf) - 1, " t%d", | |
1908 | ap->eh_tries); | |
1909 | ||
1910 | if (ehc->i.dev) { | |
1911 | ata_dev_printk(ehc->i.dev, KERN_ERR, "exception Emask 0x%x " | |
1912 | "SAct 0x%x SErr 0x%x action 0x%x%s%s\n", | |
1913 | ehc->i.err_mask, link->sactive, ehc->i.serror, | |
1914 | ehc->i.action, frozen, tries_buf); | |
1915 | if (desc) | |
1916 | ata_dev_printk(ehc->i.dev, KERN_ERR, "%s\n", desc); | |
1917 | } else { | |
1918 | ata_link_printk(link, KERN_ERR, "exception Emask 0x%x " | |
1919 | "SAct 0x%x SErr 0x%x action 0x%x%s%s\n", | |
1920 | ehc->i.err_mask, link->sactive, ehc->i.serror, | |
1921 | ehc->i.action, frozen, tries_buf); | |
1922 | if (desc) | |
1923 | ata_link_printk(link, KERN_ERR, "%s\n", desc); | |
1924 | } | |
1925 | ||
1926 | if (ehc->i.serror) | |
1927 | ata_port_printk(ap, KERN_ERR, | |
1928 | "SError: { %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s}\n", | |
1929 | ehc->i.serror & SERR_DATA_RECOVERED ? "RecovData " : "", | |
1930 | ehc->i.serror & SERR_COMM_RECOVERED ? "RecovComm " : "", | |
1931 | ehc->i.serror & SERR_DATA ? "UnrecovData " : "", | |
1932 | ehc->i.serror & SERR_PERSISTENT ? "Persist " : "", | |
1933 | ehc->i.serror & SERR_PROTOCOL ? "Proto " : "", | |
1934 | ehc->i.serror & SERR_INTERNAL ? "HostInt " : "", | |
1935 | ehc->i.serror & SERR_PHYRDY_CHG ? "PHYRdyChg " : "", | |
1936 | ehc->i.serror & SERR_PHY_INT_ERR ? "PHYInt " : "", | |
1937 | ehc->i.serror & SERR_COMM_WAKE ? "CommWake " : "", | |
1938 | ehc->i.serror & SERR_10B_8B_ERR ? "10B8B " : "", | |
1939 | ehc->i.serror & SERR_DISPARITY ? "Dispar " : "", | |
1940 | ehc->i.serror & SERR_CRC ? "BadCRC " : "", | |
1941 | ehc->i.serror & SERR_HANDSHAKE ? "Handshk " : "", | |
1942 | ehc->i.serror & SERR_LINK_SEQ_ERR ? "LinkSeq " : "", | |
1943 | ehc->i.serror & SERR_TRANS_ST_ERROR ? "TrStaTrns " : "", | |
1944 | ehc->i.serror & SERR_UNRECOG_FIS ? "UnrecFIS " : "", | |
1945 | ehc->i.serror & SERR_DEV_XCHG ? "DevExch " : ""); | |
1946 | ||
1947 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1948 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
1949 | struct ata_taskfile *cmd = &qc->tf, *res = &qc->result_tf; | |
1950 | const u8 *cdb = qc->cdb; | |
1951 | char data_buf[20] = ""; | |
1952 | char cdb_buf[70] = ""; | |
1953 | ||
1954 | if (!(qc->flags & ATA_QCFLAG_FAILED) || | |
1955 | qc->dev->link != link || !qc->err_mask) | |
1956 | continue; | |
1957 | ||
1958 | if (qc->dma_dir != DMA_NONE) { | |
1959 | static const char *dma_str[] = { | |
1960 | [DMA_BIDIRECTIONAL] = "bidi", | |
1961 | [DMA_TO_DEVICE] = "out", | |
1962 | [DMA_FROM_DEVICE] = "in", | |
1963 | }; | |
1964 | static const char *prot_str[] = { | |
1965 | [ATA_PROT_PIO] = "pio", | |
1966 | [ATA_PROT_DMA] = "dma", | |
1967 | [ATA_PROT_NCQ] = "ncq", | |
1968 | [ATAPI_PROT_PIO] = "pio", | |
1969 | [ATAPI_PROT_DMA] = "dma", | |
1970 | }; | |
1971 | ||
1972 | snprintf(data_buf, sizeof(data_buf), " %s %u %s", | |
1973 | prot_str[qc->tf.protocol], qc->nbytes, | |
1974 | dma_str[qc->dma_dir]); | |
1975 | } | |
1976 | ||
1977 | if (ata_is_atapi(qc->tf.protocol)) | |
1978 | snprintf(cdb_buf, sizeof(cdb_buf), | |
1979 | "cdb %02x %02x %02x %02x %02x %02x %02x %02x " | |
1980 | "%02x %02x %02x %02x %02x %02x %02x %02x\n ", | |
1981 | cdb[0], cdb[1], cdb[2], cdb[3], | |
1982 | cdb[4], cdb[5], cdb[6], cdb[7], | |
1983 | cdb[8], cdb[9], cdb[10], cdb[11], | |
1984 | cdb[12], cdb[13], cdb[14], cdb[15]); | |
1985 | ||
1986 | ata_dev_printk(qc->dev, KERN_ERR, | |
1987 | "cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x " | |
1988 | "tag %d%s\n %s" | |
1989 | "res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x " | |
1990 | "Emask 0x%x (%s)%s\n", | |
1991 | cmd->command, cmd->feature, cmd->nsect, | |
1992 | cmd->lbal, cmd->lbam, cmd->lbah, | |
1993 | cmd->hob_feature, cmd->hob_nsect, | |
1994 | cmd->hob_lbal, cmd->hob_lbam, cmd->hob_lbah, | |
1995 | cmd->device, qc->tag, data_buf, cdb_buf, | |
1996 | res->command, res->feature, res->nsect, | |
1997 | res->lbal, res->lbam, res->lbah, | |
1998 | res->hob_feature, res->hob_nsect, | |
1999 | res->hob_lbal, res->hob_lbam, res->hob_lbah, | |
2000 | res->device, qc->err_mask, ata_err_string(qc->err_mask), | |
2001 | qc->err_mask & AC_ERR_NCQ ? " <F>" : ""); | |
2002 | ||
2003 | if (res->command & (ATA_BUSY | ATA_DRDY | ATA_DF | ATA_DRQ | | |
2004 | ATA_ERR)) { | |
2005 | if (res->command & ATA_BUSY) | |
2006 | ata_dev_printk(qc->dev, KERN_ERR, | |
2007 | "status: { Busy }\n"); | |
2008 | else | |
2009 | ata_dev_printk(qc->dev, KERN_ERR, | |
2010 | "status: { %s%s%s%s}\n", | |
2011 | res->command & ATA_DRDY ? "DRDY " : "", | |
2012 | res->command & ATA_DF ? "DF " : "", | |
2013 | res->command & ATA_DRQ ? "DRQ " : "", | |
2014 | res->command & ATA_ERR ? "ERR " : ""); | |
2015 | } | |
2016 | ||
2017 | if (cmd->command != ATA_CMD_PACKET && | |
2018 | (res->feature & (ATA_ICRC | ATA_UNC | ATA_IDNF | | |
2019 | ATA_ABORTED))) | |
2020 | ata_dev_printk(qc->dev, KERN_ERR, | |
2021 | "error: { %s%s%s%s}\n", | |
2022 | res->feature & ATA_ICRC ? "ICRC " : "", | |
2023 | res->feature & ATA_UNC ? "UNC " : "", | |
2024 | res->feature & ATA_IDNF ? "IDNF " : "", | |
2025 | res->feature & ATA_ABORTED ? "ABRT " : ""); | |
2026 | } | |
2027 | } | |
2028 | ||
2029 | /** | |
2030 | * ata_eh_report - report error handling to user | |
2031 | * @ap: ATA port to report EH about | |
2032 | * | |
2033 | * Report EH to user. | |
2034 | * | |
2035 | * LOCKING: | |
2036 | * None. | |
2037 | */ | |
2038 | void ata_eh_report(struct ata_port *ap) | |
2039 | { | |
2040 | struct ata_link *link; | |
2041 | ||
2042 | __ata_port_for_each_link(link, ap) | |
2043 | ata_eh_link_report(link); | |
2044 | } | |
2045 | ||
2046 | static int ata_do_reset(struct ata_link *link, ata_reset_fn_t reset, | |
2047 | unsigned int *classes, unsigned long deadline) | |
2048 | { | |
2049 | struct ata_device *dev; | |
2050 | ||
2051 | ata_link_for_each_dev(dev, link) | |
2052 | classes[dev->devno] = ATA_DEV_UNKNOWN; | |
2053 | ||
2054 | return reset(link, classes, deadline); | |
2055 | } | |
2056 | ||
2057 | static int ata_eh_followup_srst_needed(struct ata_link *link, | |
2058 | int rc, int classify, | |
2059 | const unsigned int *classes) | |
2060 | { | |
2061 | if ((link->flags & ATA_LFLAG_NO_SRST) || ata_link_offline(link)) | |
2062 | return 0; | |
2063 | if (rc == -EAGAIN) { | |
2064 | if (classify) | |
2065 | return 1; | |
2066 | rc = 0; | |
2067 | } | |
2068 | if (rc != 0) | |
2069 | return 0; | |
2070 | if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) | |
2071 | return 1; | |
2072 | return 0; | |
2073 | } | |
2074 | ||
2075 | int ata_eh_reset(struct ata_link *link, int classify, | |
2076 | ata_prereset_fn_t prereset, ata_reset_fn_t softreset, | |
2077 | ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) | |
2078 | { | |
2079 | const int max_tries = ARRAY_SIZE(ata_eh_reset_timeouts); | |
2080 | struct ata_port *ap = link->ap; | |
2081 | struct ata_eh_context *ehc = &link->eh_context; | |
2082 | unsigned int *classes = ehc->classes; | |
2083 | unsigned int lflags = link->flags; | |
2084 | int verbose = !(ehc->i.flags & ATA_EHI_QUIET); | |
2085 | int try = 0; | |
2086 | struct ata_device *dev; | |
2087 | unsigned long deadline, now; | |
2088 | ata_reset_fn_t reset; | |
2089 | unsigned long flags; | |
2090 | u32 sstatus; | |
2091 | int nr_known, rc; | |
2092 | ||
2093 | /* | |
2094 | * Prepare to reset | |
2095 | */ | |
2096 | spin_lock_irqsave(ap->lock, flags); | |
2097 | ap->pflags |= ATA_PFLAG_RESETTING; | |
2098 | spin_unlock_irqrestore(ap->lock, flags); | |
2099 | ||
2100 | ata_eh_about_to_do(link, NULL, ATA_EH_RESET); | |
2101 | ||
2102 | ata_link_for_each_dev(dev, link) { | |
2103 | /* If we issue an SRST then an ATA drive (not ATAPI) | |
2104 | * may change configuration and be in PIO0 timing. If | |
2105 | * we do a hard reset (or are coming from power on) | |
2106 | * this is true for ATA or ATAPI. Until we've set a | |
2107 | * suitable controller mode we should not touch the | |
2108 | * bus as we may be talking too fast. | |
2109 | */ | |
2110 | dev->pio_mode = XFER_PIO_0; | |
2111 | ||
2112 | /* If the controller has a pio mode setup function | |
2113 | * then use it to set the chipset to rights. Don't | |
2114 | * touch the DMA setup as that will be dealt with when | |
2115 | * configuring devices. | |
2116 | */ | |
2117 | if (ap->ops->set_piomode) | |
2118 | ap->ops->set_piomode(ap, dev); | |
2119 | } | |
2120 | ||
2121 | /* prefer hardreset */ | |
2122 | reset = NULL; | |
2123 | ehc->i.action &= ~ATA_EH_RESET; | |
2124 | if (hardreset) { | |
2125 | reset = hardreset; | |
2126 | ehc->i.action = ATA_EH_HARDRESET; | |
2127 | } else if (softreset) { | |
2128 | reset = softreset; | |
2129 | ehc->i.action = ATA_EH_SOFTRESET; | |
2130 | } | |
2131 | ||
2132 | if (prereset) { | |
2133 | rc = prereset(link, jiffies + ATA_EH_PRERESET_TIMEOUT); | |
2134 | if (rc) { | |
2135 | if (rc == -ENOENT) { | |
2136 | ata_link_printk(link, KERN_DEBUG, | |
2137 | "port disabled. ignoring.\n"); | |
2138 | ehc->i.action &= ~ATA_EH_RESET; | |
2139 | ||
2140 | ata_link_for_each_dev(dev, link) | |
2141 | classes[dev->devno] = ATA_DEV_NONE; | |
2142 | ||
2143 | rc = 0; | |
2144 | } else | |
2145 | ata_link_printk(link, KERN_ERR, | |
2146 | "prereset failed (errno=%d)\n", rc); | |
2147 | goto out; | |
2148 | } | |
2149 | ||
2150 | /* prereset() might have cleared ATA_EH_RESET. If so, | |
2151 | * bang classes and return. | |
2152 | */ | |
2153 | if (reset && !(ehc->i.action & ATA_EH_RESET)) { | |
2154 | ata_link_for_each_dev(dev, link) | |
2155 | classes[dev->devno] = ATA_DEV_NONE; | |
2156 | rc = 0; | |
2157 | goto out; | |
2158 | } | |
2159 | } | |
2160 | ||
2161 | retry: | |
2162 | /* | |
2163 | * Perform reset | |
2164 | */ | |
2165 | if (ata_is_host_link(link)) | |
2166 | ata_eh_freeze_port(ap); | |
2167 | ||
2168 | deadline = jiffies + ata_eh_reset_timeouts[try++]; | |
2169 | ||
2170 | if (reset) { | |
2171 | if (verbose) | |
2172 | ata_link_printk(link, KERN_INFO, "%s resetting link\n", | |
2173 | reset == softreset ? "soft" : "hard"); | |
2174 | ||
2175 | /* mark that this EH session started with reset */ | |
2176 | if (reset == hardreset) | |
2177 | ehc->i.flags |= ATA_EHI_DID_HARDRESET; | |
2178 | else | |
2179 | ehc->i.flags |= ATA_EHI_DID_SOFTRESET; | |
2180 | ||
2181 | rc = ata_do_reset(link, reset, classes, deadline); | |
2182 | ||
2183 | if (reset == hardreset && | |
2184 | ata_eh_followup_srst_needed(link, rc, classify, classes)) { | |
2185 | /* okay, let's do follow-up softreset */ | |
2186 | reset = softreset; | |
2187 | ||
2188 | if (!reset) { | |
2189 | ata_link_printk(link, KERN_ERR, | |
2190 | "follow-up softreset required " | |
2191 | "but no softreset avaliable\n"); | |
2192 | rc = -EINVAL; | |
2193 | goto fail; | |
2194 | } | |
2195 | ||
2196 | ata_eh_about_to_do(link, NULL, ATA_EH_RESET); | |
2197 | rc = ata_do_reset(link, reset, classes, deadline); | |
2198 | } | |
2199 | ||
2200 | /* -EAGAIN can happen if we skipped followup SRST */ | |
2201 | if (rc && rc != -EAGAIN) | |
2202 | goto fail; | |
2203 | } else { | |
2204 | if (verbose) | |
2205 | ata_link_printk(link, KERN_INFO, "no reset method " | |
2206 | "available, skipping reset\n"); | |
2207 | if (!(lflags & ATA_LFLAG_ASSUME_CLASS)) | |
2208 | lflags |= ATA_LFLAG_ASSUME_ATA; | |
2209 | } | |
2210 | ||
2211 | /* | |
2212 | * Post-reset processing | |
2213 | */ | |
2214 | ata_link_for_each_dev(dev, link) { | |
2215 | /* After the reset, the device state is PIO 0 and the | |
2216 | * controller state is undefined. Reset also wakes up | |
2217 | * drives from sleeping mode. | |
2218 | */ | |
2219 | dev->pio_mode = XFER_PIO_0; | |
2220 | dev->flags &= ~ATA_DFLAG_SLEEPING; | |
2221 | ||
2222 | if (ata_link_offline(link)) | |
2223 | continue; | |
2224 | ||
2225 | /* apply class override */ | |
2226 | if (lflags & ATA_LFLAG_ASSUME_ATA) | |
2227 | classes[dev->devno] = ATA_DEV_ATA; | |
2228 | else if (lflags & ATA_LFLAG_ASSUME_SEMB) | |
2229 | classes[dev->devno] = ATA_DEV_SEMB_UNSUP; /* not yet */ | |
2230 | } | |
2231 | ||
2232 | /* record current link speed */ | |
2233 | if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0) | |
2234 | link->sata_spd = (sstatus >> 4) & 0xf; | |
2235 | ||
2236 | /* thaw the port */ | |
2237 | if (ata_is_host_link(link)) | |
2238 | ata_eh_thaw_port(ap); | |
2239 | ||
2240 | /* postreset() should clear hardware SError. Although SError | |
2241 | * is cleared during link resume, clearing SError here is | |
2242 | * necessary as some PHYs raise hotplug events after SRST. | |
2243 | * This introduces race condition where hotplug occurs between | |
2244 | * reset and here. This race is mediated by cross checking | |
2245 | * link onlineness and classification result later. | |
2246 | */ | |
2247 | if (postreset) | |
2248 | postreset(link, classes); | |
2249 | ||
2250 | /* clear cached SError */ | |
2251 | spin_lock_irqsave(link->ap->lock, flags); | |
2252 | link->eh_info.serror = 0; | |
2253 | spin_unlock_irqrestore(link->ap->lock, flags); | |
2254 | ||
2255 | /* Make sure onlineness and classification result correspond. | |
2256 | * Hotplug could have happened during reset and some | |
2257 | * controllers fail to wait while a drive is spinning up after | |
2258 | * being hotplugged causing misdetection. By cross checking | |
2259 | * link onlineness and classification result, those conditions | |
2260 | * can be reliably detected and retried. | |
2261 | */ | |
2262 | nr_known = 0; | |
2263 | ata_link_for_each_dev(dev, link) { | |
2264 | /* convert all ATA_DEV_UNKNOWN to ATA_DEV_NONE */ | |
2265 | if (classes[dev->devno] == ATA_DEV_UNKNOWN) | |
2266 | classes[dev->devno] = ATA_DEV_NONE; | |
2267 | else | |
2268 | nr_known++; | |
2269 | } | |
2270 | ||
2271 | if (classify && !nr_known && ata_link_online(link)) { | |
2272 | if (try < max_tries) { | |
2273 | ata_link_printk(link, KERN_WARNING, "link online but " | |
2274 | "device misclassified, retrying\n"); | |
2275 | rc = -EAGAIN; | |
2276 | goto fail; | |
2277 | } | |
2278 | ata_link_printk(link, KERN_WARNING, | |
2279 | "link online but device misclassified, " | |
2280 | "device detection might fail\n"); | |
2281 | } | |
2282 | ||
2283 | /* reset successful, schedule revalidation */ | |
2284 | ata_eh_done(link, NULL, ATA_EH_RESET); | |
2285 | ehc->i.action |= ATA_EH_REVALIDATE; | |
2286 | ||
2287 | rc = 0; | |
2288 | out: | |
2289 | /* clear hotplug flag */ | |
2290 | ehc->i.flags &= ~ATA_EHI_HOTPLUGGED; | |
2291 | ||
2292 | spin_lock_irqsave(ap->lock, flags); | |
2293 | ap->pflags &= ~ATA_PFLAG_RESETTING; | |
2294 | spin_unlock_irqrestore(ap->lock, flags); | |
2295 | ||
2296 | return rc; | |
2297 | ||
2298 | fail: | |
2299 | /* if SCR isn't accessible on a fan-out port, PMP needs to be reset */ | |
2300 | if (!ata_is_host_link(link) && | |
2301 | sata_scr_read(link, SCR_STATUS, &sstatus)) | |
2302 | rc = -ERESTART; | |
2303 | ||
2304 | if (rc == -ERESTART || try >= max_tries) | |
2305 | goto out; | |
2306 | ||
2307 | now = jiffies; | |
2308 | if (time_before(now, deadline)) { | |
2309 | unsigned long delta = deadline - now; | |
2310 | ||
2311 | ata_link_printk(link, KERN_WARNING, "reset failed " | |
2312 | "(errno=%d), retrying in %u secs\n", | |
2313 | rc, (jiffies_to_msecs(delta) + 999) / 1000); | |
2314 | ||
2315 | while (delta) | |
2316 | delta = schedule_timeout_uninterruptible(delta); | |
2317 | } | |
2318 | ||
2319 | if (rc == -EPIPE || try == max_tries - 1) | |
2320 | sata_down_spd_limit(link); | |
2321 | if (hardreset) | |
2322 | reset = hardreset; | |
2323 | goto retry; | |
2324 | } | |
2325 | ||
2326 | static int ata_eh_revalidate_and_attach(struct ata_link *link, | |
2327 | struct ata_device **r_failed_dev) | |
2328 | { | |
2329 | struct ata_port *ap = link->ap; | |
2330 | struct ata_eh_context *ehc = &link->eh_context; | |
2331 | struct ata_device *dev; | |
2332 | unsigned int new_mask = 0; | |
2333 | unsigned long flags; | |
2334 | int rc = 0; | |
2335 | ||
2336 | DPRINTK("ENTER\n"); | |
2337 | ||
2338 | /* For PATA drive side cable detection to work, IDENTIFY must | |
2339 | * be done backwards such that PDIAG- is released by the slave | |
2340 | * device before the master device is identified. | |
2341 | */ | |
2342 | ata_link_for_each_dev_reverse(dev, link) { | |
2343 | unsigned int action = ata_eh_dev_action(dev); | |
2344 | unsigned int readid_flags = 0; | |
2345 | ||
2346 | if (ehc->i.flags & ATA_EHI_DID_RESET) | |
2347 | readid_flags |= ATA_READID_POSTRESET; | |
2348 | ||
2349 | if ((action & ATA_EH_REVALIDATE) && ata_dev_enabled(dev)) { | |
2350 | WARN_ON(dev->class == ATA_DEV_PMP); | |
2351 | ||
2352 | if (ata_link_offline(link)) { | |
2353 | rc = -EIO; | |
2354 | goto err; | |
2355 | } | |
2356 | ||
2357 | ata_eh_about_to_do(link, dev, ATA_EH_REVALIDATE); | |
2358 | rc = ata_dev_revalidate(dev, ehc->classes[dev->devno], | |
2359 | readid_flags); | |
2360 | if (rc) | |
2361 | goto err; | |
2362 | ||
2363 | ata_eh_done(link, dev, ATA_EH_REVALIDATE); | |
2364 | ||
2365 | /* Configuration may have changed, reconfigure | |
2366 | * transfer mode. | |
2367 | */ | |
2368 | ehc->i.flags |= ATA_EHI_SETMODE; | |
2369 | ||
2370 | /* schedule the scsi_rescan_device() here */ | |
2371 | queue_work(ata_aux_wq, &(ap->scsi_rescan_task)); | |
2372 | } else if (dev->class == ATA_DEV_UNKNOWN && | |
2373 | ehc->tries[dev->devno] && | |
2374 | ata_class_enabled(ehc->classes[dev->devno])) { | |
2375 | dev->class = ehc->classes[dev->devno]; | |
2376 | ||
2377 | if (dev->class == ATA_DEV_PMP) | |
2378 | rc = sata_pmp_attach(dev); | |
2379 | else | |
2380 | rc = ata_dev_read_id(dev, &dev->class, | |
2381 | readid_flags, dev->id); | |
2382 | switch (rc) { | |
2383 | case 0: | |
2384 | new_mask |= 1 << dev->devno; | |
2385 | break; | |
2386 | case -ENOENT: | |
2387 | /* IDENTIFY was issued to non-existent | |
2388 | * device. No need to reset. Just | |
2389 | * thaw and kill the device. | |
2390 | */ | |
2391 | ata_eh_thaw_port(ap); | |
2392 | dev->class = ATA_DEV_UNKNOWN; | |
2393 | break; | |
2394 | default: | |
2395 | dev->class = ATA_DEV_UNKNOWN; | |
2396 | goto err; | |
2397 | } | |
2398 | } | |
2399 | } | |
2400 | ||
2401 | /* PDIAG- should have been released, ask cable type if post-reset */ | |
2402 | if ((ehc->i.flags & ATA_EHI_DID_RESET) && ata_is_host_link(link)) { | |
2403 | if (ap->ops->cable_detect) | |
2404 | ap->cbl = ap->ops->cable_detect(ap); | |
2405 | ata_force_cbl(ap); | |
2406 | } | |
2407 | ||
2408 | /* Configure new devices forward such that user doesn't see | |
2409 | * device detection messages backwards. | |
2410 | */ | |
2411 | ata_link_for_each_dev(dev, link) { | |
2412 | if (!(new_mask & (1 << dev->devno)) || | |
2413 | dev->class == ATA_DEV_PMP) | |
2414 | continue; | |
2415 | ||
2416 | ehc->i.flags |= ATA_EHI_PRINTINFO; | |
2417 | rc = ata_dev_configure(dev); | |
2418 | ehc->i.flags &= ~ATA_EHI_PRINTINFO; | |
2419 | if (rc) | |
2420 | goto err; | |
2421 | ||
2422 | spin_lock_irqsave(ap->lock, flags); | |
2423 | ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG; | |
2424 | spin_unlock_irqrestore(ap->lock, flags); | |
2425 | ||
2426 | /* new device discovered, configure xfermode */ | |
2427 | ehc->i.flags |= ATA_EHI_SETMODE; | |
2428 | } | |
2429 | ||
2430 | return 0; | |
2431 | ||
2432 | err: | |
2433 | *r_failed_dev = dev; | |
2434 | DPRINTK("EXIT rc=%d\n", rc); | |
2435 | return rc; | |
2436 | } | |
2437 | ||
2438 | /** | |
2439 | * ata_set_mode - Program timings and issue SET FEATURES - XFER | |
2440 | * @link: link on which timings will be programmed | |
2441 | * @r_failed_dev: out paramter for failed device | |
2442 | * | |
2443 | * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If | |
2444 | * ata_set_mode() fails, pointer to the failing device is | |
2445 | * returned in @r_failed_dev. | |
2446 | * | |
2447 | * LOCKING: | |
2448 | * PCI/etc. bus probe sem. | |
2449 | * | |
2450 | * RETURNS: | |
2451 | * 0 on success, negative errno otherwise | |
2452 | */ | |
2453 | int ata_set_mode(struct ata_link *link, struct ata_device **r_failed_dev) | |
2454 | { | |
2455 | struct ata_port *ap = link->ap; | |
2456 | struct ata_device *dev; | |
2457 | int rc; | |
2458 | ||
2459 | /* if data transfer is verified, clear DUBIOUS_XFER on ering top */ | |
2460 | ata_link_for_each_dev(dev, link) { | |
2461 | if (!(dev->flags & ATA_DFLAG_DUBIOUS_XFER)) { | |
2462 | struct ata_ering_entry *ent; | |
2463 | ||
2464 | ent = ata_ering_top(&dev->ering); | |
2465 | if (ent) | |
2466 | ent->eflags &= ~ATA_EFLAG_DUBIOUS_XFER; | |
2467 | } | |
2468 | } | |
2469 | ||
2470 | /* has private set_mode? */ | |
2471 | if (ap->ops->set_mode) | |
2472 | rc = ap->ops->set_mode(link, r_failed_dev); | |
2473 | else | |
2474 | rc = ata_do_set_mode(link, r_failed_dev); | |
2475 | ||
2476 | /* if transfer mode has changed, set DUBIOUS_XFER on device */ | |
2477 | ata_link_for_each_dev(dev, link) { | |
2478 | struct ata_eh_context *ehc = &link->eh_context; | |
2479 | u8 saved_xfer_mode = ehc->saved_xfer_mode[dev->devno]; | |
2480 | u8 saved_ncq = !!(ehc->saved_ncq_enabled & (1 << dev->devno)); | |
2481 | ||
2482 | if (dev->xfer_mode != saved_xfer_mode || | |
2483 | ata_ncq_enabled(dev) != saved_ncq) | |
2484 | dev->flags |= ATA_DFLAG_DUBIOUS_XFER; | |
2485 | } | |
2486 | ||
2487 | return rc; | |
2488 | } | |
2489 | ||
2490 | static int ata_link_nr_enabled(struct ata_link *link) | |
2491 | { | |
2492 | struct ata_device *dev; | |
2493 | int cnt = 0; | |
2494 | ||
2495 | ata_link_for_each_dev(dev, link) | |
2496 | if (ata_dev_enabled(dev)) | |
2497 | cnt++; | |
2498 | return cnt; | |
2499 | } | |
2500 | ||
2501 | static int ata_link_nr_vacant(struct ata_link *link) | |
2502 | { | |
2503 | struct ata_device *dev; | |
2504 | int cnt = 0; | |
2505 | ||
2506 | ata_link_for_each_dev(dev, link) | |
2507 | if (dev->class == ATA_DEV_UNKNOWN) | |
2508 | cnt++; | |
2509 | return cnt; | |
2510 | } | |
2511 | ||
2512 | static int ata_eh_skip_recovery(struct ata_link *link) | |
2513 | { | |
2514 | struct ata_port *ap = link->ap; | |
2515 | struct ata_eh_context *ehc = &link->eh_context; | |
2516 | struct ata_device *dev; | |
2517 | ||
2518 | /* skip disabled links */ | |
2519 | if (link->flags & ATA_LFLAG_DISABLED) | |
2520 | return 1; | |
2521 | ||
2522 | /* thaw frozen port and recover failed devices */ | |
2523 | if ((ap->pflags & ATA_PFLAG_FROZEN) || ata_link_nr_enabled(link)) | |
2524 | return 0; | |
2525 | ||
2526 | /* reset at least once if reset is requested */ | |
2527 | if ((ehc->i.action & ATA_EH_RESET) && | |
2528 | !(ehc->i.flags & ATA_EHI_DID_RESET)) | |
2529 | return 0; | |
2530 | ||
2531 | /* skip if class codes for all vacant slots are ATA_DEV_NONE */ | |
2532 | ata_link_for_each_dev(dev, link) { | |
2533 | if (dev->class == ATA_DEV_UNKNOWN && | |
2534 | ehc->classes[dev->devno] != ATA_DEV_NONE) | |
2535 | return 0; | |
2536 | } | |
2537 | ||
2538 | return 1; | |
2539 | } | |
2540 | ||
2541 | static int ata_eh_schedule_probe(struct ata_device *dev) | |
2542 | { | |
2543 | struct ata_eh_context *ehc = &dev->link->eh_context; | |
2544 | ||
2545 | if (!(ehc->i.probe_mask & (1 << dev->devno)) || | |
2546 | (ehc->did_probe_mask & (1 << dev->devno))) | |
2547 | return 0; | |
2548 | ||
2549 | ata_eh_detach_dev(dev); | |
2550 | ata_dev_init(dev); | |
2551 | ehc->did_probe_mask |= (1 << dev->devno); | |
2552 | ehc->i.action |= ATA_EH_RESET; | |
2553 | ehc->saved_xfer_mode[dev->devno] = 0; | |
2554 | ehc->saved_ncq_enabled &= ~(1 << dev->devno); | |
2555 | ||
2556 | return 1; | |
2557 | } | |
2558 | ||
2559 | static int ata_eh_handle_dev_fail(struct ata_device *dev, int err) | |
2560 | { | |
2561 | struct ata_eh_context *ehc = &dev->link->eh_context; | |
2562 | ||
2563 | ehc->tries[dev->devno]--; | |
2564 | ||
2565 | switch (err) { | |
2566 | case -ENODEV: | |
2567 | /* device missing or wrong IDENTIFY data, schedule probing */ | |
2568 | ehc->i.probe_mask |= (1 << dev->devno); | |
2569 | case -EINVAL: | |
2570 | /* give it just one more chance */ | |
2571 | ehc->tries[dev->devno] = min(ehc->tries[dev->devno], 1); | |
2572 | case -EIO: | |
2573 | if (ehc->tries[dev->devno] == 1 && dev->pio_mode > XFER_PIO_0) { | |
2574 | /* This is the last chance, better to slow | |
2575 | * down than lose it. | |
2576 | */ | |
2577 | sata_down_spd_limit(dev->link); | |
2578 | ata_down_xfermask_limit(dev, ATA_DNXFER_PIO); | |
2579 | } | |
2580 | } | |
2581 | ||
2582 | if (ata_dev_enabled(dev) && !ehc->tries[dev->devno]) { | |
2583 | /* disable device if it has used up all its chances */ | |
2584 | ata_dev_disable(dev); | |
2585 | ||
2586 | /* detach if offline */ | |
2587 | if (ata_link_offline(dev->link)) | |
2588 | ata_eh_detach_dev(dev); | |
2589 | ||
2590 | /* schedule probe if necessary */ | |
2591 | if (ata_eh_schedule_probe(dev)) | |
2592 | ehc->tries[dev->devno] = ATA_EH_DEV_TRIES; | |
2593 | ||
2594 | return 1; | |
2595 | } else { | |
2596 | ehc->i.action |= ATA_EH_RESET; | |
2597 | return 0; | |
2598 | } | |
2599 | } | |
2600 | ||
2601 | /** | |
2602 | * ata_eh_recover - recover host port after error | |
2603 | * @ap: host port to recover | |
2604 | * @prereset: prereset method (can be NULL) | |
2605 | * @softreset: softreset method (can be NULL) | |
2606 | * @hardreset: hardreset method (can be NULL) | |
2607 | * @postreset: postreset method (can be NULL) | |
2608 | * @r_failed_link: out parameter for failed link | |
2609 | * | |
2610 | * This is the alpha and omega, eum and yang, heart and soul of | |
2611 | * libata exception handling. On entry, actions required to | |
2612 | * recover each link and hotplug requests are recorded in the | |
2613 | * link's eh_context. This function executes all the operations | |
2614 | * with appropriate retrials and fallbacks to resurrect failed | |
2615 | * devices, detach goners and greet newcomers. | |
2616 | * | |
2617 | * LOCKING: | |
2618 | * Kernel thread context (may sleep). | |
2619 | * | |
2620 | * RETURNS: | |
2621 | * 0 on success, -errno on failure. | |
2622 | */ | |
2623 | int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset, | |
2624 | ata_reset_fn_t softreset, ata_reset_fn_t hardreset, | |
2625 | ata_postreset_fn_t postreset, | |
2626 | struct ata_link **r_failed_link) | |
2627 | { | |
2628 | struct ata_link *link; | |
2629 | struct ata_device *dev; | |
2630 | int nr_failed_devs, nr_disabled_devs; | |
2631 | int rc; | |
2632 | unsigned long flags; | |
2633 | ||
2634 | DPRINTK("ENTER\n"); | |
2635 | ||
2636 | /* prep for recovery */ | |
2637 | ata_port_for_each_link(link, ap) { | |
2638 | struct ata_eh_context *ehc = &link->eh_context; | |
2639 | ||
2640 | /* re-enable link? */ | |
2641 | if (ehc->i.action & ATA_EH_ENABLE_LINK) { | |
2642 | ata_eh_about_to_do(link, NULL, ATA_EH_ENABLE_LINK); | |
2643 | spin_lock_irqsave(ap->lock, flags); | |
2644 | link->flags &= ~ATA_LFLAG_DISABLED; | |
2645 | spin_unlock_irqrestore(ap->lock, flags); | |
2646 | ata_eh_done(link, NULL, ATA_EH_ENABLE_LINK); | |
2647 | } | |
2648 | ||
2649 | ata_link_for_each_dev(dev, link) { | |
2650 | if (link->flags & ATA_LFLAG_NO_RETRY) | |
2651 | ehc->tries[dev->devno] = 1; | |
2652 | else | |
2653 | ehc->tries[dev->devno] = ATA_EH_DEV_TRIES; | |
2654 | ||
2655 | /* collect port action mask recorded in dev actions */ | |
2656 | ehc->i.action |= ehc->i.dev_action[dev->devno] & | |
2657 | ~ATA_EH_PERDEV_MASK; | |
2658 | ehc->i.dev_action[dev->devno] &= ATA_EH_PERDEV_MASK; | |
2659 | ||
2660 | /* process hotplug request */ | |
2661 | if (dev->flags & ATA_DFLAG_DETACH) | |
2662 | ata_eh_detach_dev(dev); | |
2663 | ||
2664 | /* schedule probe if necessary */ | |
2665 | if (!ata_dev_enabled(dev)) | |
2666 | ata_eh_schedule_probe(dev); | |
2667 | } | |
2668 | } | |
2669 | ||
2670 | retry: | |
2671 | rc = 0; | |
2672 | nr_failed_devs = 0; | |
2673 | nr_disabled_devs = 0; | |
2674 | ||
2675 | /* if UNLOADING, finish immediately */ | |
2676 | if (ap->pflags & ATA_PFLAG_UNLOADING) | |
2677 | goto out; | |
2678 | ||
2679 | /* prep for EH */ | |
2680 | ata_port_for_each_link(link, ap) { | |
2681 | struct ata_eh_context *ehc = &link->eh_context; | |
2682 | ||
2683 | /* skip EH if possible. */ | |
2684 | if (ata_eh_skip_recovery(link)) | |
2685 | ehc->i.action = 0; | |
2686 | ||
2687 | ata_link_for_each_dev(dev, link) | |
2688 | ehc->classes[dev->devno] = ATA_DEV_UNKNOWN; | |
2689 | } | |
2690 | ||
2691 | /* reset */ | |
2692 | ata_port_for_each_link(link, ap) { | |
2693 | struct ata_eh_context *ehc = &link->eh_context; | |
2694 | ||
2695 | if (!(ehc->i.action & ATA_EH_RESET)) | |
2696 | continue; | |
2697 | ||
2698 | rc = ata_eh_reset(link, ata_link_nr_vacant(link), | |
2699 | prereset, softreset, hardreset, postreset); | |
2700 | if (rc) { | |
2701 | ata_link_printk(link, KERN_ERR, | |
2702 | "reset failed, giving up\n"); | |
2703 | goto out; | |
2704 | } | |
2705 | } | |
2706 | ||
2707 | /* the rest */ | |
2708 | ata_port_for_each_link(link, ap) { | |
2709 | struct ata_eh_context *ehc = &link->eh_context; | |
2710 | ||
2711 | /* revalidate existing devices and attach new ones */ | |
2712 | rc = ata_eh_revalidate_and_attach(link, &dev); | |
2713 | if (rc) | |
2714 | goto dev_fail; | |
2715 | ||
2716 | /* if PMP got attached, return, pmp EH will take care of it */ | |
2717 | if (link->device->class == ATA_DEV_PMP) { | |
2718 | ehc->i.action = 0; | |
2719 | return 0; | |
2720 | } | |
2721 | ||
2722 | /* configure transfer mode if necessary */ | |
2723 | if (ehc->i.flags & ATA_EHI_SETMODE) { | |
2724 | rc = ata_set_mode(link, &dev); | |
2725 | if (rc) | |
2726 | goto dev_fail; | |
2727 | ehc->i.flags &= ~ATA_EHI_SETMODE; | |
2728 | } | |
2729 | ||
2730 | if (ehc->i.action & ATA_EH_LPM) | |
2731 | ata_link_for_each_dev(dev, link) | |
2732 | ata_dev_enable_pm(dev, ap->pm_policy); | |
2733 | ||
2734 | /* this link is okay now */ | |
2735 | ehc->i.flags = 0; | |
2736 | continue; | |
2737 | ||
2738 | dev_fail: | |
2739 | nr_failed_devs++; | |
2740 | if (ata_eh_handle_dev_fail(dev, rc)) | |
2741 | nr_disabled_devs++; | |
2742 | ||
2743 | if (ap->pflags & ATA_PFLAG_FROZEN) { | |
2744 | /* PMP reset requires working host port. | |
2745 | * Can't retry if it's frozen. | |
2746 | */ | |
2747 | if (sata_pmp_attached(ap)) | |
2748 | goto out; | |
2749 | break; | |
2750 | } | |
2751 | } | |
2752 | ||
2753 | if (nr_failed_devs) { | |
2754 | if (nr_failed_devs != nr_disabled_devs) { | |
2755 | ata_port_printk(ap, KERN_WARNING, "failed to recover " | |
2756 | "some devices, retrying in 5 secs\n"); | |
2757 | ssleep(5); | |
2758 | } else { | |
2759 | /* no device left to recover, repeat fast */ | |
2760 | msleep(500); | |
2761 | } | |
2762 | ||
2763 | goto retry; | |
2764 | } | |
2765 | ||
2766 | out: | |
2767 | if (rc && r_failed_link) | |
2768 | *r_failed_link = link; | |
2769 | ||
2770 | DPRINTK("EXIT, rc=%d\n", rc); | |
2771 | return rc; | |
2772 | } | |
2773 | ||
2774 | /** | |
2775 | * ata_eh_finish - finish up EH | |
2776 | * @ap: host port to finish EH for | |
2777 | * | |
2778 | * Recovery is complete. Clean up EH states and retry or finish | |
2779 | * failed qcs. | |
2780 | * | |
2781 | * LOCKING: | |
2782 | * None. | |
2783 | */ | |
2784 | void ata_eh_finish(struct ata_port *ap) | |
2785 | { | |
2786 | int tag; | |
2787 | ||
2788 | /* retry or finish qcs */ | |
2789 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
2790 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
2791 | ||
2792 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
2793 | continue; | |
2794 | ||
2795 | if (qc->err_mask) { | |
2796 | /* FIXME: Once EH migration is complete, | |
2797 | * generate sense data in this function, | |
2798 | * considering both err_mask and tf. | |
2799 | */ | |
2800 | if (qc->flags & ATA_QCFLAG_RETRY) | |
2801 | ata_eh_qc_retry(qc); | |
2802 | else | |
2803 | ata_eh_qc_complete(qc); | |
2804 | } else { | |
2805 | if (qc->flags & ATA_QCFLAG_SENSE_VALID) { | |
2806 | ata_eh_qc_complete(qc); | |
2807 | } else { | |
2808 | /* feed zero TF to sense generation */ | |
2809 | memset(&qc->result_tf, 0, sizeof(qc->result_tf)); | |
2810 | ata_eh_qc_retry(qc); | |
2811 | } | |
2812 | } | |
2813 | } | |
2814 | ||
2815 | /* make sure nr_active_links is zero after EH */ | |
2816 | WARN_ON(ap->nr_active_links); | |
2817 | ap->nr_active_links = 0; | |
2818 | } | |
2819 | ||
2820 | /** | |
2821 | * ata_do_eh - do standard error handling | |
2822 | * @ap: host port to handle error for | |
2823 | * | |
2824 | * @prereset: prereset method (can be NULL) | |
2825 | * @softreset: softreset method (can be NULL) | |
2826 | * @hardreset: hardreset method (can be NULL) | |
2827 | * @postreset: postreset method (can be NULL) | |
2828 | * | |
2829 | * Perform standard error handling sequence. | |
2830 | * | |
2831 | * LOCKING: | |
2832 | * Kernel thread context (may sleep). | |
2833 | */ | |
2834 | void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset, | |
2835 | ata_reset_fn_t softreset, ata_reset_fn_t hardreset, | |
2836 | ata_postreset_fn_t postreset) | |
2837 | { | |
2838 | struct ata_device *dev; | |
2839 | int rc; | |
2840 | ||
2841 | ata_eh_autopsy(ap); | |
2842 | ata_eh_report(ap); | |
2843 | ||
2844 | rc = ata_eh_recover(ap, prereset, softreset, hardreset, postreset, | |
2845 | NULL); | |
2846 | if (rc) { | |
2847 | ata_link_for_each_dev(dev, &ap->link) | |
2848 | ata_dev_disable(dev); | |
2849 | } | |
2850 | ||
2851 | ata_eh_finish(ap); | |
2852 | } | |
2853 | ||
2854 | /** | |
2855 | * ata_std_error_handler - standard error handler | |
2856 | * @ap: host port to handle error for | |
2857 | * | |
2858 | * Standard error handler | |
2859 | * | |
2860 | * LOCKING: | |
2861 | * Kernel thread context (may sleep). | |
2862 | */ | |
2863 | void ata_std_error_handler(struct ata_port *ap) | |
2864 | { | |
2865 | struct ata_port_operations *ops = ap->ops; | |
2866 | ata_reset_fn_t hardreset = ops->hardreset; | |
2867 | ||
2868 | /* ignore built-in hardreset if SCR access is not available */ | |
2869 | if (ata_is_builtin_hardreset(hardreset) && !sata_scr_valid(&ap->link)) | |
2870 | hardreset = NULL; | |
2871 | ||
2872 | ata_do_eh(ap, ops->prereset, ops->softreset, hardreset, ops->postreset); | |
2873 | } | |
2874 | ||
2875 | #ifdef CONFIG_PM | |
2876 | /** | |
2877 | * ata_eh_handle_port_suspend - perform port suspend operation | |
2878 | * @ap: port to suspend | |
2879 | * | |
2880 | * Suspend @ap. | |
2881 | * | |
2882 | * LOCKING: | |
2883 | * Kernel thread context (may sleep). | |
2884 | */ | |
2885 | static void ata_eh_handle_port_suspend(struct ata_port *ap) | |
2886 | { | |
2887 | unsigned long flags; | |
2888 | int rc = 0; | |
2889 | ||
2890 | /* are we suspending? */ | |
2891 | spin_lock_irqsave(ap->lock, flags); | |
2892 | if (!(ap->pflags & ATA_PFLAG_PM_PENDING) || | |
2893 | ap->pm_mesg.event == PM_EVENT_ON) { | |
2894 | spin_unlock_irqrestore(ap->lock, flags); | |
2895 | return; | |
2896 | } | |
2897 | spin_unlock_irqrestore(ap->lock, flags); | |
2898 | ||
2899 | WARN_ON(ap->pflags & ATA_PFLAG_SUSPENDED); | |
2900 | ||
2901 | /* tell ACPI we're suspending */ | |
2902 | rc = ata_acpi_on_suspend(ap); | |
2903 | if (rc) | |
2904 | goto out; | |
2905 | ||
2906 | /* suspend */ | |
2907 | ata_eh_freeze_port(ap); | |
2908 | ||
2909 | if (ap->ops->port_suspend) | |
2910 | rc = ap->ops->port_suspend(ap, ap->pm_mesg); | |
2911 | ||
2912 | ata_acpi_set_state(ap, PMSG_SUSPEND); | |
2913 | out: | |
2914 | /* report result */ | |
2915 | spin_lock_irqsave(ap->lock, flags); | |
2916 | ||
2917 | ap->pflags &= ~ATA_PFLAG_PM_PENDING; | |
2918 | if (rc == 0) | |
2919 | ap->pflags |= ATA_PFLAG_SUSPENDED; | |
2920 | else if (ap->pflags & ATA_PFLAG_FROZEN) | |
2921 | ata_port_schedule_eh(ap); | |
2922 | ||
2923 | if (ap->pm_result) { | |
2924 | *ap->pm_result = rc; | |
2925 | ap->pm_result = NULL; | |
2926 | } | |
2927 | ||
2928 | spin_unlock_irqrestore(ap->lock, flags); | |
2929 | ||
2930 | return; | |
2931 | } | |
2932 | ||
2933 | /** | |
2934 | * ata_eh_handle_port_resume - perform port resume operation | |
2935 | * @ap: port to resume | |
2936 | * | |
2937 | * Resume @ap. | |
2938 | * | |
2939 | * LOCKING: | |
2940 | * Kernel thread context (may sleep). | |
2941 | */ | |
2942 | static void ata_eh_handle_port_resume(struct ata_port *ap) | |
2943 | { | |
2944 | unsigned long flags; | |
2945 | int rc = 0; | |
2946 | ||
2947 | /* are we resuming? */ | |
2948 | spin_lock_irqsave(ap->lock, flags); | |
2949 | if (!(ap->pflags & ATA_PFLAG_PM_PENDING) || | |
2950 | ap->pm_mesg.event != PM_EVENT_ON) { | |
2951 | spin_unlock_irqrestore(ap->lock, flags); | |
2952 | return; | |
2953 | } | |
2954 | spin_unlock_irqrestore(ap->lock, flags); | |
2955 | ||
2956 | WARN_ON(!(ap->pflags & ATA_PFLAG_SUSPENDED)); | |
2957 | ||
2958 | ata_acpi_set_state(ap, PMSG_ON); | |
2959 | ||
2960 | if (ap->ops->port_resume) | |
2961 | rc = ap->ops->port_resume(ap); | |
2962 | ||
2963 | /* tell ACPI that we're resuming */ | |
2964 | ata_acpi_on_resume(ap); | |
2965 | ||
2966 | /* report result */ | |
2967 | spin_lock_irqsave(ap->lock, flags); | |
2968 | ap->pflags &= ~(ATA_PFLAG_PM_PENDING | ATA_PFLAG_SUSPENDED); | |
2969 | if (ap->pm_result) { | |
2970 | *ap->pm_result = rc; | |
2971 | ap->pm_result = NULL; | |
2972 | } | |
2973 | spin_unlock_irqrestore(ap->lock, flags); | |
2974 | } | |
2975 | #endif /* CONFIG_PM */ |