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ece1d636 TH |
1 | /* |
2 | * libata-eh.c - libata error handling | |
3 | * | |
4 | * Maintained by: Jeff Garzik <jgarzik@pobox.com> | |
5 | * Please ALWAYS copy linux-ide@vger.kernel.org | |
6 | * on emails. | |
7 | * | |
8 | * Copyright 2006 Tejun Heo <htejun@gmail.com> | |
9 | * | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License as | |
13 | * published by the Free Software Foundation; either version 2, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
19 | * General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; see the file COPYING. If not, write to | |
23 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, | |
24 | * USA. | |
25 | * | |
26 | * | |
27 | * libata documentation is available via 'make {ps|pdf}docs', | |
28 | * as Documentation/DocBook/libata.* | |
29 | * | |
30 | * Hardware documentation available from http://www.t13.org/ and | |
31 | * http://www.sata-io.org/ | |
32 | * | |
33 | */ | |
34 | ||
ece1d636 TH |
35 | #include <linux/kernel.h> |
36 | #include <scsi/scsi.h> | |
37 | #include <scsi/scsi_host.h> | |
38 | #include <scsi/scsi_eh.h> | |
39 | #include <scsi/scsi_device.h> | |
40 | #include <scsi/scsi_cmnd.h> | |
c6fd2807 | 41 | #include "../scsi/scsi_transport_api.h" |
ece1d636 TH |
42 | |
43 | #include <linux/libata.h> | |
44 | ||
45 | #include "libata.h" | |
46 | ||
7d47e8d4 TH |
47 | enum { |
48 | ATA_EH_SPDN_NCQ_OFF = (1 << 0), | |
49 | ATA_EH_SPDN_SPEED_DOWN = (1 << 1), | |
50 | ATA_EH_SPDN_FALLBACK_TO_PIO = (1 << 2), | |
51 | }; | |
52 | ||
31daabda TH |
53 | /* Waiting in ->prereset can never be reliable. It's sometimes nice |
54 | * to wait there but it can't be depended upon; otherwise, we wouldn't | |
55 | * be resetting. Just give it enough time for most drives to spin up. | |
56 | */ | |
57 | enum { | |
58 | ATA_EH_PRERESET_TIMEOUT = 10 * HZ, | |
59 | }; | |
60 | ||
61 | /* The following table determines how we sequence resets. Each entry | |
62 | * represents timeout for that try. The first try can be soft or | |
63 | * hardreset. All others are hardreset if available. In most cases | |
64 | * the first reset w/ 10sec timeout should succeed. Following entries | |
65 | * are mostly for error handling, hotplug and retarded devices. | |
66 | */ | |
67 | static const unsigned long ata_eh_reset_timeouts[] = { | |
68 | 10 * HZ, /* most drives spin up by 10sec */ | |
69 | 10 * HZ, /* > 99% working drives spin up before 20sec */ | |
70 | 35 * HZ, /* give > 30 secs of idleness for retarded devices */ | |
71 | 5 * HZ, /* and sweet one last chance */ | |
72 | /* > 1 min has elapsed, give up */ | |
73 | }; | |
74 | ||
ad9e2762 | 75 | static void __ata_port_freeze(struct ata_port *ap); |
720ba126 | 76 | static void ata_eh_finish(struct ata_port *ap); |
6ffa01d8 | 77 | #ifdef CONFIG_PM |
500530f6 TH |
78 | static void ata_eh_handle_port_suspend(struct ata_port *ap); |
79 | static void ata_eh_handle_port_resume(struct ata_port *ap); | |
6ffa01d8 TH |
80 | #else /* CONFIG_PM */ |
81 | static void ata_eh_handle_port_suspend(struct ata_port *ap) | |
82 | { } | |
83 | ||
84 | static void ata_eh_handle_port_resume(struct ata_port *ap) | |
85 | { } | |
6ffa01d8 | 86 | #endif /* CONFIG_PM */ |
ad9e2762 | 87 | |
b64bbc39 TH |
88 | static void __ata_ehi_pushv_desc(struct ata_eh_info *ehi, const char *fmt, |
89 | va_list args) | |
90 | { | |
91 | ehi->desc_len += vscnprintf(ehi->desc + ehi->desc_len, | |
92 | ATA_EH_DESC_LEN - ehi->desc_len, | |
93 | fmt, args); | |
94 | } | |
95 | ||
96 | /** | |
97 | * __ata_ehi_push_desc - push error description without adding separator | |
98 | * @ehi: target EHI | |
99 | * @fmt: printf format string | |
100 | * | |
101 | * Format string according to @fmt and append it to @ehi->desc. | |
102 | * | |
103 | * LOCKING: | |
104 | * spin_lock_irqsave(host lock) | |
105 | */ | |
106 | void __ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...) | |
107 | { | |
108 | va_list args; | |
109 | ||
110 | va_start(args, fmt); | |
111 | __ata_ehi_pushv_desc(ehi, fmt, args); | |
112 | va_end(args); | |
113 | } | |
114 | ||
115 | /** | |
116 | * ata_ehi_push_desc - push error description with separator | |
117 | * @ehi: target EHI | |
118 | * @fmt: printf format string | |
119 | * | |
120 | * Format string according to @fmt and append it to @ehi->desc. | |
121 | * If @ehi->desc is not empty, ", " is added in-between. | |
122 | * | |
123 | * LOCKING: | |
124 | * spin_lock_irqsave(host lock) | |
125 | */ | |
126 | void ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...) | |
127 | { | |
128 | va_list args; | |
129 | ||
130 | if (ehi->desc_len) | |
131 | __ata_ehi_push_desc(ehi, ", "); | |
132 | ||
133 | va_start(args, fmt); | |
134 | __ata_ehi_pushv_desc(ehi, fmt, args); | |
135 | va_end(args); | |
136 | } | |
137 | ||
138 | /** | |
139 | * ata_ehi_clear_desc - clean error description | |
140 | * @ehi: target EHI | |
141 | * | |
142 | * Clear @ehi->desc. | |
143 | * | |
144 | * LOCKING: | |
145 | * spin_lock_irqsave(host lock) | |
146 | */ | |
147 | void ata_ehi_clear_desc(struct ata_eh_info *ehi) | |
148 | { | |
149 | ehi->desc[0] = '\0'; | |
150 | ehi->desc_len = 0; | |
151 | } | |
152 | ||
0c247c55 TH |
153 | static void ata_ering_record(struct ata_ering *ering, int is_io, |
154 | unsigned int err_mask) | |
155 | { | |
156 | struct ata_ering_entry *ent; | |
157 | ||
158 | WARN_ON(!err_mask); | |
159 | ||
160 | ering->cursor++; | |
161 | ering->cursor %= ATA_ERING_SIZE; | |
162 | ||
163 | ent = &ering->ring[ering->cursor]; | |
164 | ent->is_io = is_io; | |
165 | ent->err_mask = err_mask; | |
166 | ent->timestamp = get_jiffies_64(); | |
167 | } | |
168 | ||
7d47e8d4 | 169 | static void ata_ering_clear(struct ata_ering *ering) |
0c247c55 | 170 | { |
7d47e8d4 | 171 | memset(ering, 0, sizeof(*ering)); |
0c247c55 TH |
172 | } |
173 | ||
174 | static int ata_ering_map(struct ata_ering *ering, | |
175 | int (*map_fn)(struct ata_ering_entry *, void *), | |
176 | void *arg) | |
177 | { | |
178 | int idx, rc = 0; | |
179 | struct ata_ering_entry *ent; | |
180 | ||
181 | idx = ering->cursor; | |
182 | do { | |
183 | ent = &ering->ring[idx]; | |
184 | if (!ent->err_mask) | |
185 | break; | |
186 | rc = map_fn(ent, arg); | |
187 | if (rc) | |
188 | break; | |
189 | idx = (idx - 1 + ATA_ERING_SIZE) % ATA_ERING_SIZE; | |
190 | } while (idx != ering->cursor); | |
191 | ||
192 | return rc; | |
193 | } | |
194 | ||
64f65ca6 TH |
195 | static unsigned int ata_eh_dev_action(struct ata_device *dev) |
196 | { | |
197 | struct ata_eh_context *ehc = &dev->ap->eh_context; | |
198 | ||
199 | return ehc->i.action | ehc->i.dev_action[dev->devno]; | |
200 | } | |
201 | ||
af181c2d TH |
202 | static void ata_eh_clear_action(struct ata_device *dev, |
203 | struct ata_eh_info *ehi, unsigned int action) | |
204 | { | |
205 | int i; | |
206 | ||
207 | if (!dev) { | |
208 | ehi->action &= ~action; | |
209 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
210 | ehi->dev_action[i] &= ~action; | |
211 | } else { | |
212 | /* doesn't make sense for port-wide EH actions */ | |
213 | WARN_ON(!(action & ATA_EH_PERDEV_MASK)); | |
214 | ||
215 | /* break ehi->action into ehi->dev_action */ | |
216 | if (ehi->action & action) { | |
217 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
218 | ehi->dev_action[i] |= ehi->action & action; | |
219 | ehi->action &= ~action; | |
220 | } | |
221 | ||
222 | /* turn off the specified per-dev action */ | |
223 | ehi->dev_action[dev->devno] &= ~action; | |
224 | } | |
225 | } | |
226 | ||
ece1d636 TH |
227 | /** |
228 | * ata_scsi_timed_out - SCSI layer time out callback | |
229 | * @cmd: timed out SCSI command | |
230 | * | |
231 | * Handles SCSI layer timeout. We race with normal completion of | |
232 | * the qc for @cmd. If the qc is already gone, we lose and let | |
233 | * the scsi command finish (EH_HANDLED). Otherwise, the qc has | |
234 | * timed out and EH should be invoked. Prevent ata_qc_complete() | |
235 | * from finishing it by setting EH_SCHEDULED and return | |
236 | * EH_NOT_HANDLED. | |
237 | * | |
ad9e2762 TH |
238 | * TODO: kill this function once old EH is gone. |
239 | * | |
ece1d636 TH |
240 | * LOCKING: |
241 | * Called from timer context | |
242 | * | |
243 | * RETURNS: | |
244 | * EH_HANDLED or EH_NOT_HANDLED | |
245 | */ | |
246 | enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd) | |
247 | { | |
248 | struct Scsi_Host *host = cmd->device->host; | |
35bb94b1 | 249 | struct ata_port *ap = ata_shost_to_port(host); |
ece1d636 TH |
250 | unsigned long flags; |
251 | struct ata_queued_cmd *qc; | |
ad9e2762 | 252 | enum scsi_eh_timer_return ret; |
ece1d636 TH |
253 | |
254 | DPRINTK("ENTER\n"); | |
255 | ||
ad9e2762 TH |
256 | if (ap->ops->error_handler) { |
257 | ret = EH_NOT_HANDLED; | |
258 | goto out; | |
259 | } | |
260 | ||
261 | ret = EH_HANDLED; | |
ba6a1308 | 262 | spin_lock_irqsave(ap->lock, flags); |
ece1d636 TH |
263 | qc = ata_qc_from_tag(ap, ap->active_tag); |
264 | if (qc) { | |
265 | WARN_ON(qc->scsicmd != cmd); | |
266 | qc->flags |= ATA_QCFLAG_EH_SCHEDULED; | |
267 | qc->err_mask |= AC_ERR_TIMEOUT; | |
268 | ret = EH_NOT_HANDLED; | |
269 | } | |
ba6a1308 | 270 | spin_unlock_irqrestore(ap->lock, flags); |
ece1d636 | 271 | |
ad9e2762 | 272 | out: |
ece1d636 TH |
273 | DPRINTK("EXIT, ret=%d\n", ret); |
274 | return ret; | |
275 | } | |
276 | ||
277 | /** | |
278 | * ata_scsi_error - SCSI layer error handler callback | |
279 | * @host: SCSI host on which error occurred | |
280 | * | |
281 | * Handles SCSI-layer-thrown error events. | |
282 | * | |
283 | * LOCKING: | |
284 | * Inherited from SCSI layer (none, can sleep) | |
285 | * | |
286 | * RETURNS: | |
287 | * Zero. | |
288 | */ | |
381544bb | 289 | void ata_scsi_error(struct Scsi_Host *host) |
ece1d636 | 290 | { |
35bb94b1 | 291 | struct ata_port *ap = ata_shost_to_port(host); |
ad9e2762 TH |
292 | int i, repeat_cnt = ATA_EH_MAX_REPEAT; |
293 | unsigned long flags; | |
ece1d636 TH |
294 | |
295 | DPRINTK("ENTER\n"); | |
296 | ||
ad9e2762 | 297 | /* synchronize with port task */ |
ece1d636 TH |
298 | ata_port_flush_task(ap); |
299 | ||
cca3974e | 300 | /* synchronize with host lock and sort out timeouts */ |
ad9e2762 TH |
301 | |
302 | /* For new EH, all qcs are finished in one of three ways - | |
303 | * normal completion, error completion, and SCSI timeout. | |
304 | * Both cmpletions can race against SCSI timeout. When normal | |
305 | * completion wins, the qc never reaches EH. When error | |
306 | * completion wins, the qc has ATA_QCFLAG_FAILED set. | |
307 | * | |
308 | * When SCSI timeout wins, things are a bit more complex. | |
309 | * Normal or error completion can occur after the timeout but | |
310 | * before this point. In such cases, both types of | |
311 | * completions are honored. A scmd is determined to have | |
312 | * timed out iff its associated qc is active and not failed. | |
313 | */ | |
314 | if (ap->ops->error_handler) { | |
315 | struct scsi_cmnd *scmd, *tmp; | |
316 | int nr_timedout = 0; | |
317 | ||
e30349d2 | 318 | spin_lock_irqsave(ap->lock, flags); |
ad9e2762 TH |
319 | |
320 | list_for_each_entry_safe(scmd, tmp, &host->eh_cmd_q, eh_entry) { | |
321 | struct ata_queued_cmd *qc; | |
322 | ||
323 | for (i = 0; i < ATA_MAX_QUEUE; i++) { | |
324 | qc = __ata_qc_from_tag(ap, i); | |
325 | if (qc->flags & ATA_QCFLAG_ACTIVE && | |
326 | qc->scsicmd == scmd) | |
327 | break; | |
328 | } | |
329 | ||
330 | if (i < ATA_MAX_QUEUE) { | |
331 | /* the scmd has an associated qc */ | |
332 | if (!(qc->flags & ATA_QCFLAG_FAILED)) { | |
333 | /* which hasn't failed yet, timeout */ | |
334 | qc->err_mask |= AC_ERR_TIMEOUT; | |
335 | qc->flags |= ATA_QCFLAG_FAILED; | |
336 | nr_timedout++; | |
337 | } | |
338 | } else { | |
339 | /* Normal completion occurred after | |
340 | * SCSI timeout but before this point. | |
341 | * Successfully complete it. | |
342 | */ | |
343 | scmd->retries = scmd->allowed; | |
344 | scsi_eh_finish_cmd(scmd, &ap->eh_done_q); | |
345 | } | |
346 | } | |
347 | ||
348 | /* If we have timed out qcs. They belong to EH from | |
349 | * this point but the state of the controller is | |
350 | * unknown. Freeze the port to make sure the IRQ | |
351 | * handler doesn't diddle with those qcs. This must | |
352 | * be done atomically w.r.t. setting QCFLAG_FAILED. | |
353 | */ | |
354 | if (nr_timedout) | |
355 | __ata_port_freeze(ap); | |
356 | ||
e30349d2 | 357 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 | 358 | } else |
e30349d2 | 359 | spin_unlock_wait(ap->lock); |
ad9e2762 TH |
360 | |
361 | repeat: | |
362 | /* invoke error handler */ | |
363 | if (ap->ops->error_handler) { | |
500530f6 TH |
364 | /* process port resume request */ |
365 | ata_eh_handle_port_resume(ap); | |
366 | ||
f3e81b19 | 367 | /* fetch & clear EH info */ |
e30349d2 | 368 | spin_lock_irqsave(ap->lock, flags); |
f3e81b19 TH |
369 | |
370 | memset(&ap->eh_context, 0, sizeof(ap->eh_context)); | |
371 | ap->eh_context.i = ap->eh_info; | |
372 | memset(&ap->eh_info, 0, sizeof(ap->eh_info)); | |
373 | ||
b51e9e5d TH |
374 | ap->pflags |= ATA_PFLAG_EH_IN_PROGRESS; |
375 | ap->pflags &= ~ATA_PFLAG_EH_PENDING; | |
f3e81b19 | 376 | |
e30349d2 | 377 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 | 378 | |
500530f6 TH |
379 | /* invoke EH, skip if unloading or suspended */ |
380 | if (!(ap->pflags & (ATA_PFLAG_UNLOADING | ATA_PFLAG_SUSPENDED))) | |
720ba126 TH |
381 | ap->ops->error_handler(ap); |
382 | else | |
383 | ata_eh_finish(ap); | |
ad9e2762 | 384 | |
500530f6 TH |
385 | /* process port suspend request */ |
386 | ata_eh_handle_port_suspend(ap); | |
387 | ||
ad9e2762 TH |
388 | /* Exception might have happend after ->error_handler |
389 | * recovered the port but before this point. Repeat | |
390 | * EH in such case. | |
391 | */ | |
e30349d2 | 392 | spin_lock_irqsave(ap->lock, flags); |
ad9e2762 | 393 | |
b51e9e5d | 394 | if (ap->pflags & ATA_PFLAG_EH_PENDING) { |
ad9e2762 TH |
395 | if (--repeat_cnt) { |
396 | ata_port_printk(ap, KERN_INFO, | |
397 | "EH pending after completion, " | |
398 | "repeating EH (cnt=%d)\n", repeat_cnt); | |
e30349d2 | 399 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 TH |
400 | goto repeat; |
401 | } | |
402 | ata_port_printk(ap, KERN_ERR, "EH pending after %d " | |
403 | "tries, giving up\n", ATA_EH_MAX_REPEAT); | |
914616a3 | 404 | ap->pflags &= ~ATA_PFLAG_EH_PENDING; |
ad9e2762 TH |
405 | } |
406 | ||
f3e81b19 TH |
407 | /* this run is complete, make sure EH info is clear */ |
408 | memset(&ap->eh_info, 0, sizeof(ap->eh_info)); | |
409 | ||
e30349d2 | 410 | /* Clear host_eh_scheduled while holding ap->lock such |
ad9e2762 TH |
411 | * that if exception occurs after this point but |
412 | * before EH completion, SCSI midlayer will | |
413 | * re-initiate EH. | |
414 | */ | |
415 | host->host_eh_scheduled = 0; | |
416 | ||
e30349d2 | 417 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 TH |
418 | } else { |
419 | WARN_ON(ata_qc_from_tag(ap, ap->active_tag) == NULL); | |
420 | ap->ops->eng_timeout(ap); | |
421 | } | |
ece1d636 | 422 | |
ad9e2762 | 423 | /* finish or retry handled scmd's and clean up */ |
ece1d636 TH |
424 | WARN_ON(host->host_failed || !list_empty(&host->eh_cmd_q)); |
425 | ||
426 | scsi_eh_flush_done_q(&ap->eh_done_q); | |
427 | ||
ad9e2762 | 428 | /* clean up */ |
e30349d2 | 429 | spin_lock_irqsave(ap->lock, flags); |
ad9e2762 | 430 | |
1cdaf534 | 431 | if (ap->pflags & ATA_PFLAG_LOADING) |
b51e9e5d | 432 | ap->pflags &= ~ATA_PFLAG_LOADING; |
1cdaf534 | 433 | else if (ap->pflags & ATA_PFLAG_SCSI_HOTPLUG) |
52bad64d | 434 | queue_delayed_work(ata_aux_wq, &ap->hotplug_task, 0); |
1cdaf534 TH |
435 | |
436 | if (ap->pflags & ATA_PFLAG_RECOVERED) | |
437 | ata_port_printk(ap, KERN_INFO, "EH complete\n"); | |
580b2102 | 438 | |
b51e9e5d | 439 | ap->pflags &= ~(ATA_PFLAG_SCSI_HOTPLUG | ATA_PFLAG_RECOVERED); |
ad9e2762 | 440 | |
c6cf9e99 | 441 | /* tell wait_eh that we're done */ |
b51e9e5d | 442 | ap->pflags &= ~ATA_PFLAG_EH_IN_PROGRESS; |
c6cf9e99 TH |
443 | wake_up_all(&ap->eh_wait_q); |
444 | ||
e30349d2 | 445 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 | 446 | |
ece1d636 | 447 | DPRINTK("EXIT\n"); |
ece1d636 TH |
448 | } |
449 | ||
c6cf9e99 TH |
450 | /** |
451 | * ata_port_wait_eh - Wait for the currently pending EH to complete | |
452 | * @ap: Port to wait EH for | |
453 | * | |
454 | * Wait until the currently pending EH is complete. | |
455 | * | |
456 | * LOCKING: | |
457 | * Kernel thread context (may sleep). | |
458 | */ | |
459 | void ata_port_wait_eh(struct ata_port *ap) | |
460 | { | |
461 | unsigned long flags; | |
462 | DEFINE_WAIT(wait); | |
463 | ||
464 | retry: | |
ba6a1308 | 465 | spin_lock_irqsave(ap->lock, flags); |
c6cf9e99 | 466 | |
b51e9e5d | 467 | while (ap->pflags & (ATA_PFLAG_EH_PENDING | ATA_PFLAG_EH_IN_PROGRESS)) { |
c6cf9e99 | 468 | prepare_to_wait(&ap->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE); |
ba6a1308 | 469 | spin_unlock_irqrestore(ap->lock, flags); |
c6cf9e99 | 470 | schedule(); |
ba6a1308 | 471 | spin_lock_irqsave(ap->lock, flags); |
c6cf9e99 | 472 | } |
0a1b622e | 473 | finish_wait(&ap->eh_wait_q, &wait); |
c6cf9e99 | 474 | |
ba6a1308 | 475 | spin_unlock_irqrestore(ap->lock, flags); |
c6cf9e99 TH |
476 | |
477 | /* make sure SCSI EH is complete */ | |
cca3974e | 478 | if (scsi_host_in_recovery(ap->scsi_host)) { |
c6cf9e99 TH |
479 | msleep(10); |
480 | goto retry; | |
481 | } | |
482 | } | |
483 | ||
ece1d636 TH |
484 | /** |
485 | * ata_qc_timeout - Handle timeout of queued command | |
486 | * @qc: Command that timed out | |
487 | * | |
488 | * Some part of the kernel (currently, only the SCSI layer) | |
489 | * has noticed that the active command on port @ap has not | |
490 | * completed after a specified length of time. Handle this | |
491 | * condition by disabling DMA (if necessary) and completing | |
492 | * transactions, with error if necessary. | |
493 | * | |
494 | * This also handles the case of the "lost interrupt", where | |
495 | * for some reason (possibly hardware bug, possibly driver bug) | |
496 | * an interrupt was not delivered to the driver, even though the | |
497 | * transaction completed successfully. | |
498 | * | |
ad9e2762 TH |
499 | * TODO: kill this function once old EH is gone. |
500 | * | |
ece1d636 TH |
501 | * LOCKING: |
502 | * Inherited from SCSI layer (none, can sleep) | |
503 | */ | |
504 | static void ata_qc_timeout(struct ata_queued_cmd *qc) | |
505 | { | |
506 | struct ata_port *ap = qc->ap; | |
ece1d636 TH |
507 | u8 host_stat = 0, drv_stat; |
508 | unsigned long flags; | |
509 | ||
510 | DPRINTK("ENTER\n"); | |
511 | ||
512 | ap->hsm_task_state = HSM_ST_IDLE; | |
513 | ||
ba6a1308 | 514 | spin_lock_irqsave(ap->lock, flags); |
ece1d636 TH |
515 | |
516 | switch (qc->tf.protocol) { | |
517 | ||
518 | case ATA_PROT_DMA: | |
519 | case ATA_PROT_ATAPI_DMA: | |
520 | host_stat = ap->ops->bmdma_status(ap); | |
521 | ||
522 | /* before we do anything else, clear DMA-Start bit */ | |
523 | ap->ops->bmdma_stop(qc); | |
524 | ||
525 | /* fall through */ | |
526 | ||
527 | default: | |
528 | ata_altstatus(ap); | |
529 | drv_stat = ata_chk_status(ap); | |
530 | ||
531 | /* ack bmdma irq events */ | |
532 | ap->ops->irq_clear(ap); | |
533 | ||
f15a1daf TH |
534 | ata_dev_printk(qc->dev, KERN_ERR, "command 0x%x timeout, " |
535 | "stat 0x%x host_stat 0x%x\n", | |
536 | qc->tf.command, drv_stat, host_stat); | |
ece1d636 TH |
537 | |
538 | /* complete taskfile transaction */ | |
c13b56a1 | 539 | qc->err_mask |= AC_ERR_TIMEOUT; |
ece1d636 TH |
540 | break; |
541 | } | |
542 | ||
ba6a1308 | 543 | spin_unlock_irqrestore(ap->lock, flags); |
ece1d636 TH |
544 | |
545 | ata_eh_qc_complete(qc); | |
546 | ||
547 | DPRINTK("EXIT\n"); | |
548 | } | |
549 | ||
550 | /** | |
551 | * ata_eng_timeout - Handle timeout of queued command | |
552 | * @ap: Port on which timed-out command is active | |
553 | * | |
554 | * Some part of the kernel (currently, only the SCSI layer) | |
555 | * has noticed that the active command on port @ap has not | |
556 | * completed after a specified length of time. Handle this | |
557 | * condition by disabling DMA (if necessary) and completing | |
558 | * transactions, with error if necessary. | |
559 | * | |
560 | * This also handles the case of the "lost interrupt", where | |
561 | * for some reason (possibly hardware bug, possibly driver bug) | |
562 | * an interrupt was not delivered to the driver, even though the | |
563 | * transaction completed successfully. | |
564 | * | |
ad9e2762 TH |
565 | * TODO: kill this function once old EH is gone. |
566 | * | |
ece1d636 TH |
567 | * LOCKING: |
568 | * Inherited from SCSI layer (none, can sleep) | |
569 | */ | |
570 | void ata_eng_timeout(struct ata_port *ap) | |
571 | { | |
572 | DPRINTK("ENTER\n"); | |
573 | ||
574 | ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag)); | |
575 | ||
576 | DPRINTK("EXIT\n"); | |
577 | } | |
578 | ||
f686bcb8 TH |
579 | /** |
580 | * ata_qc_schedule_eh - schedule qc for error handling | |
581 | * @qc: command to schedule error handling for | |
582 | * | |
583 | * Schedule error handling for @qc. EH will kick in as soon as | |
584 | * other commands are drained. | |
585 | * | |
586 | * LOCKING: | |
cca3974e | 587 | * spin_lock_irqsave(host lock) |
f686bcb8 TH |
588 | */ |
589 | void ata_qc_schedule_eh(struct ata_queued_cmd *qc) | |
590 | { | |
591 | struct ata_port *ap = qc->ap; | |
592 | ||
593 | WARN_ON(!ap->ops->error_handler); | |
594 | ||
595 | qc->flags |= ATA_QCFLAG_FAILED; | |
b51e9e5d | 596 | qc->ap->pflags |= ATA_PFLAG_EH_PENDING; |
f686bcb8 TH |
597 | |
598 | /* The following will fail if timeout has already expired. | |
599 | * ata_scsi_error() takes care of such scmds on EH entry. | |
600 | * Note that ATA_QCFLAG_FAILED is unconditionally set after | |
601 | * this function completes. | |
602 | */ | |
603 | scsi_req_abort_cmd(qc->scsicmd); | |
604 | } | |
605 | ||
7b70fc03 TH |
606 | /** |
607 | * ata_port_schedule_eh - schedule error handling without a qc | |
608 | * @ap: ATA port to schedule EH for | |
609 | * | |
610 | * Schedule error handling for @ap. EH will kick in as soon as | |
611 | * all commands are drained. | |
612 | * | |
613 | * LOCKING: | |
cca3974e | 614 | * spin_lock_irqsave(host lock) |
7b70fc03 TH |
615 | */ |
616 | void ata_port_schedule_eh(struct ata_port *ap) | |
617 | { | |
618 | WARN_ON(!ap->ops->error_handler); | |
619 | ||
f4d6d004 TH |
620 | if (ap->pflags & ATA_PFLAG_INITIALIZING) |
621 | return; | |
622 | ||
b51e9e5d | 623 | ap->pflags |= ATA_PFLAG_EH_PENDING; |
cca3974e | 624 | scsi_schedule_eh(ap->scsi_host); |
7b70fc03 TH |
625 | |
626 | DPRINTK("port EH scheduled\n"); | |
627 | } | |
628 | ||
629 | /** | |
630 | * ata_port_abort - abort all qc's on the port | |
631 | * @ap: ATA port to abort qc's for | |
632 | * | |
633 | * Abort all active qc's of @ap and schedule EH. | |
634 | * | |
635 | * LOCKING: | |
cca3974e | 636 | * spin_lock_irqsave(host lock) |
7b70fc03 TH |
637 | * |
638 | * RETURNS: | |
639 | * Number of aborted qc's. | |
640 | */ | |
641 | int ata_port_abort(struct ata_port *ap) | |
642 | { | |
643 | int tag, nr_aborted = 0; | |
644 | ||
645 | WARN_ON(!ap->ops->error_handler); | |
646 | ||
647 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
648 | struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag); | |
649 | ||
650 | if (qc) { | |
651 | qc->flags |= ATA_QCFLAG_FAILED; | |
652 | ata_qc_complete(qc); | |
653 | nr_aborted++; | |
654 | } | |
655 | } | |
656 | ||
657 | if (!nr_aborted) | |
658 | ata_port_schedule_eh(ap); | |
659 | ||
660 | return nr_aborted; | |
661 | } | |
662 | ||
e3180499 TH |
663 | /** |
664 | * __ata_port_freeze - freeze port | |
665 | * @ap: ATA port to freeze | |
666 | * | |
667 | * This function is called when HSM violation or some other | |
668 | * condition disrupts normal operation of the port. Frozen port | |
669 | * is not allowed to perform any operation until the port is | |
670 | * thawed, which usually follows a successful reset. | |
671 | * | |
672 | * ap->ops->freeze() callback can be used for freezing the port | |
673 | * hardware-wise (e.g. mask interrupt and stop DMA engine). If a | |
674 | * port cannot be frozen hardware-wise, the interrupt handler | |
675 | * must ack and clear interrupts unconditionally while the port | |
676 | * is frozen. | |
677 | * | |
678 | * LOCKING: | |
cca3974e | 679 | * spin_lock_irqsave(host lock) |
e3180499 TH |
680 | */ |
681 | static void __ata_port_freeze(struct ata_port *ap) | |
682 | { | |
683 | WARN_ON(!ap->ops->error_handler); | |
684 | ||
685 | if (ap->ops->freeze) | |
686 | ap->ops->freeze(ap); | |
687 | ||
b51e9e5d | 688 | ap->pflags |= ATA_PFLAG_FROZEN; |
e3180499 | 689 | |
44877b4e | 690 | DPRINTK("ata%u port frozen\n", ap->print_id); |
e3180499 TH |
691 | } |
692 | ||
693 | /** | |
694 | * ata_port_freeze - abort & freeze port | |
695 | * @ap: ATA port to freeze | |
696 | * | |
697 | * Abort and freeze @ap. | |
698 | * | |
699 | * LOCKING: | |
cca3974e | 700 | * spin_lock_irqsave(host lock) |
e3180499 TH |
701 | * |
702 | * RETURNS: | |
703 | * Number of aborted commands. | |
704 | */ | |
705 | int ata_port_freeze(struct ata_port *ap) | |
706 | { | |
707 | int nr_aborted; | |
708 | ||
709 | WARN_ON(!ap->ops->error_handler); | |
710 | ||
711 | nr_aborted = ata_port_abort(ap); | |
712 | __ata_port_freeze(ap); | |
713 | ||
714 | return nr_aborted; | |
715 | } | |
716 | ||
717 | /** | |
718 | * ata_eh_freeze_port - EH helper to freeze port | |
719 | * @ap: ATA port to freeze | |
720 | * | |
721 | * Freeze @ap. | |
722 | * | |
723 | * LOCKING: | |
724 | * None. | |
725 | */ | |
726 | void ata_eh_freeze_port(struct ata_port *ap) | |
727 | { | |
728 | unsigned long flags; | |
729 | ||
730 | if (!ap->ops->error_handler) | |
731 | return; | |
732 | ||
ba6a1308 | 733 | spin_lock_irqsave(ap->lock, flags); |
e3180499 | 734 | __ata_port_freeze(ap); |
ba6a1308 | 735 | spin_unlock_irqrestore(ap->lock, flags); |
e3180499 TH |
736 | } |
737 | ||
738 | /** | |
739 | * ata_port_thaw_port - EH helper to thaw port | |
740 | * @ap: ATA port to thaw | |
741 | * | |
742 | * Thaw frozen port @ap. | |
743 | * | |
744 | * LOCKING: | |
745 | * None. | |
746 | */ | |
747 | void ata_eh_thaw_port(struct ata_port *ap) | |
748 | { | |
749 | unsigned long flags; | |
750 | ||
751 | if (!ap->ops->error_handler) | |
752 | return; | |
753 | ||
ba6a1308 | 754 | spin_lock_irqsave(ap->lock, flags); |
e3180499 | 755 | |
b51e9e5d | 756 | ap->pflags &= ~ATA_PFLAG_FROZEN; |
e3180499 TH |
757 | |
758 | if (ap->ops->thaw) | |
759 | ap->ops->thaw(ap); | |
760 | ||
ba6a1308 | 761 | spin_unlock_irqrestore(ap->lock, flags); |
e3180499 | 762 | |
44877b4e | 763 | DPRINTK("ata%u port thawed\n", ap->print_id); |
e3180499 TH |
764 | } |
765 | ||
ece1d636 TH |
766 | static void ata_eh_scsidone(struct scsi_cmnd *scmd) |
767 | { | |
768 | /* nada */ | |
769 | } | |
770 | ||
771 | static void __ata_eh_qc_complete(struct ata_queued_cmd *qc) | |
772 | { | |
773 | struct ata_port *ap = qc->ap; | |
774 | struct scsi_cmnd *scmd = qc->scsicmd; | |
775 | unsigned long flags; | |
776 | ||
ba6a1308 | 777 | spin_lock_irqsave(ap->lock, flags); |
ece1d636 TH |
778 | qc->scsidone = ata_eh_scsidone; |
779 | __ata_qc_complete(qc); | |
780 | WARN_ON(ata_tag_valid(qc->tag)); | |
ba6a1308 | 781 | spin_unlock_irqrestore(ap->lock, flags); |
ece1d636 TH |
782 | |
783 | scsi_eh_finish_cmd(scmd, &ap->eh_done_q); | |
784 | } | |
785 | ||
786 | /** | |
787 | * ata_eh_qc_complete - Complete an active ATA command from EH | |
788 | * @qc: Command to complete | |
789 | * | |
790 | * Indicate to the mid and upper layers that an ATA command has | |
791 | * completed. To be used from EH. | |
792 | */ | |
793 | void ata_eh_qc_complete(struct ata_queued_cmd *qc) | |
794 | { | |
795 | struct scsi_cmnd *scmd = qc->scsicmd; | |
796 | scmd->retries = scmd->allowed; | |
797 | __ata_eh_qc_complete(qc); | |
798 | } | |
799 | ||
800 | /** | |
801 | * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH | |
802 | * @qc: Command to retry | |
803 | * | |
804 | * Indicate to the mid and upper layers that an ATA command | |
805 | * should be retried. To be used from EH. | |
806 | * | |
807 | * SCSI midlayer limits the number of retries to scmd->allowed. | |
808 | * scmd->retries is decremented for commands which get retried | |
809 | * due to unrelated failures (qc->err_mask is zero). | |
810 | */ | |
811 | void ata_eh_qc_retry(struct ata_queued_cmd *qc) | |
812 | { | |
813 | struct scsi_cmnd *scmd = qc->scsicmd; | |
814 | if (!qc->err_mask && scmd->retries) | |
815 | scmd->retries--; | |
816 | __ata_eh_qc_complete(qc); | |
817 | } | |
022bdb07 | 818 | |
0ea035a3 TH |
819 | /** |
820 | * ata_eh_detach_dev - detach ATA device | |
821 | * @dev: ATA device to detach | |
822 | * | |
823 | * Detach @dev. | |
824 | * | |
825 | * LOCKING: | |
826 | * None. | |
827 | */ | |
828 | static void ata_eh_detach_dev(struct ata_device *dev) | |
829 | { | |
830 | struct ata_port *ap = dev->ap; | |
831 | unsigned long flags; | |
832 | ||
833 | ata_dev_disable(dev); | |
834 | ||
ba6a1308 | 835 | spin_lock_irqsave(ap->lock, flags); |
0ea035a3 TH |
836 | |
837 | dev->flags &= ~ATA_DFLAG_DETACH; | |
838 | ||
839 | if (ata_scsi_offline_dev(dev)) { | |
840 | dev->flags |= ATA_DFLAG_DETACHED; | |
b51e9e5d | 841 | ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG; |
0ea035a3 TH |
842 | } |
843 | ||
beb07c1a TH |
844 | /* clear per-dev EH actions */ |
845 | ata_eh_clear_action(dev, &ap->eh_info, ATA_EH_PERDEV_MASK); | |
846 | ata_eh_clear_action(dev, &ap->eh_context.i, ATA_EH_PERDEV_MASK); | |
847 | ||
ba6a1308 | 848 | spin_unlock_irqrestore(ap->lock, flags); |
0ea035a3 TH |
849 | } |
850 | ||
022bdb07 TH |
851 | /** |
852 | * ata_eh_about_to_do - about to perform eh_action | |
853 | * @ap: target ATA port | |
47005f25 | 854 | * @dev: target ATA dev for per-dev action (can be NULL) |
022bdb07 TH |
855 | * @action: action about to be performed |
856 | * | |
857 | * Called just before performing EH actions to clear related bits | |
858 | * in @ap->eh_info such that eh actions are not unnecessarily | |
859 | * repeated. | |
860 | * | |
861 | * LOCKING: | |
862 | * None. | |
863 | */ | |
47005f25 TH |
864 | static void ata_eh_about_to_do(struct ata_port *ap, struct ata_device *dev, |
865 | unsigned int action) | |
022bdb07 TH |
866 | { |
867 | unsigned long flags; | |
13abf50d TH |
868 | struct ata_eh_info *ehi = &ap->eh_info; |
869 | struct ata_eh_context *ehc = &ap->eh_context; | |
022bdb07 | 870 | |
ba6a1308 | 871 | spin_lock_irqsave(ap->lock, flags); |
1cdaf534 | 872 | |
13abf50d TH |
873 | /* Reset is represented by combination of actions and EHI |
874 | * flags. Suck in all related bits before clearing eh_info to | |
875 | * avoid losing requested action. | |
876 | */ | |
877 | if (action & ATA_EH_RESET_MASK) { | |
878 | ehc->i.action |= ehi->action & ATA_EH_RESET_MASK; | |
879 | ehc->i.flags |= ehi->flags & ATA_EHI_RESET_MODIFIER_MASK; | |
880 | ||
881 | /* make sure all reset actions are cleared & clear EHI flags */ | |
882 | action |= ATA_EH_RESET_MASK; | |
883 | ehi->flags &= ~ATA_EHI_RESET_MODIFIER_MASK; | |
884 | } | |
885 | ||
886 | ata_eh_clear_action(dev, ehi, action); | |
1cdaf534 | 887 | |
13abf50d | 888 | if (!(ehc->i.flags & ATA_EHI_QUIET)) |
1cdaf534 TH |
889 | ap->pflags |= ATA_PFLAG_RECOVERED; |
890 | ||
ba6a1308 | 891 | spin_unlock_irqrestore(ap->lock, flags); |
022bdb07 TH |
892 | } |
893 | ||
47005f25 TH |
894 | /** |
895 | * ata_eh_done - EH action complete | |
896 | * @ap: target ATA port | |
897 | * @dev: target ATA dev for per-dev action (can be NULL) | |
898 | * @action: action just completed | |
899 | * | |
900 | * Called right after performing EH actions to clear related bits | |
901 | * in @ap->eh_context. | |
902 | * | |
903 | * LOCKING: | |
904 | * None. | |
905 | */ | |
906 | static void ata_eh_done(struct ata_port *ap, struct ata_device *dev, | |
907 | unsigned int action) | |
908 | { | |
13abf50d TH |
909 | /* if reset is complete, clear all reset actions & reset modifier */ |
910 | if (action & ATA_EH_RESET_MASK) { | |
911 | action |= ATA_EH_RESET_MASK; | |
912 | ap->eh_context.i.flags &= ~ATA_EHI_RESET_MODIFIER_MASK; | |
913 | } | |
914 | ||
47005f25 TH |
915 | ata_eh_clear_action(dev, &ap->eh_context.i, action); |
916 | } | |
917 | ||
022bdb07 TH |
918 | /** |
919 | * ata_err_string - convert err_mask to descriptive string | |
920 | * @err_mask: error mask to convert to string | |
921 | * | |
922 | * Convert @err_mask to descriptive string. Errors are | |
923 | * prioritized according to severity and only the most severe | |
924 | * error is reported. | |
925 | * | |
926 | * LOCKING: | |
927 | * None. | |
928 | * | |
929 | * RETURNS: | |
930 | * Descriptive string for @err_mask | |
931 | */ | |
932 | static const char * ata_err_string(unsigned int err_mask) | |
933 | { | |
934 | if (err_mask & AC_ERR_HOST_BUS) | |
935 | return "host bus error"; | |
936 | if (err_mask & AC_ERR_ATA_BUS) | |
937 | return "ATA bus error"; | |
938 | if (err_mask & AC_ERR_TIMEOUT) | |
939 | return "timeout"; | |
940 | if (err_mask & AC_ERR_HSM) | |
941 | return "HSM violation"; | |
942 | if (err_mask & AC_ERR_SYSTEM) | |
943 | return "internal error"; | |
944 | if (err_mask & AC_ERR_MEDIA) | |
945 | return "media error"; | |
946 | if (err_mask & AC_ERR_INVALID) | |
947 | return "invalid argument"; | |
948 | if (err_mask & AC_ERR_DEV) | |
949 | return "device error"; | |
950 | return "unknown error"; | |
951 | } | |
952 | ||
e8ee8451 TH |
953 | /** |
954 | * ata_read_log_page - read a specific log page | |
955 | * @dev: target device | |
956 | * @page: page to read | |
957 | * @buf: buffer to store read page | |
958 | * @sectors: number of sectors to read | |
959 | * | |
960 | * Read log page using READ_LOG_EXT command. | |
961 | * | |
962 | * LOCKING: | |
963 | * Kernel thread context (may sleep). | |
964 | * | |
965 | * RETURNS: | |
966 | * 0 on success, AC_ERR_* mask otherwise. | |
967 | */ | |
968 | static unsigned int ata_read_log_page(struct ata_device *dev, | |
969 | u8 page, void *buf, unsigned int sectors) | |
970 | { | |
971 | struct ata_taskfile tf; | |
972 | unsigned int err_mask; | |
973 | ||
974 | DPRINTK("read log page - page %d\n", page); | |
975 | ||
976 | ata_tf_init(dev, &tf); | |
977 | tf.command = ATA_CMD_READ_LOG_EXT; | |
978 | tf.lbal = page; | |
979 | tf.nsect = sectors; | |
980 | tf.hob_nsect = sectors >> 8; | |
981 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_LBA48 | ATA_TFLAG_DEVICE; | |
982 | tf.protocol = ATA_PROT_PIO; | |
983 | ||
984 | err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE, | |
985 | buf, sectors * ATA_SECT_SIZE); | |
986 | ||
987 | DPRINTK("EXIT, err_mask=%x\n", err_mask); | |
988 | return err_mask; | |
989 | } | |
990 | ||
991 | /** | |
992 | * ata_eh_read_log_10h - Read log page 10h for NCQ error details | |
993 | * @dev: Device to read log page 10h from | |
994 | * @tag: Resulting tag of the failed command | |
995 | * @tf: Resulting taskfile registers of the failed command | |
996 | * | |
997 | * Read log page 10h to obtain NCQ error details and clear error | |
998 | * condition. | |
999 | * | |
1000 | * LOCKING: | |
1001 | * Kernel thread context (may sleep). | |
1002 | * | |
1003 | * RETURNS: | |
1004 | * 0 on success, -errno otherwise. | |
1005 | */ | |
1006 | static int ata_eh_read_log_10h(struct ata_device *dev, | |
1007 | int *tag, struct ata_taskfile *tf) | |
1008 | { | |
1009 | u8 *buf = dev->ap->sector_buf; | |
1010 | unsigned int err_mask; | |
1011 | u8 csum; | |
1012 | int i; | |
1013 | ||
1014 | err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, buf, 1); | |
1015 | if (err_mask) | |
1016 | return -EIO; | |
1017 | ||
1018 | csum = 0; | |
1019 | for (i = 0; i < ATA_SECT_SIZE; i++) | |
1020 | csum += buf[i]; | |
1021 | if (csum) | |
1022 | ata_dev_printk(dev, KERN_WARNING, | |
1023 | "invalid checksum 0x%x on log page 10h\n", csum); | |
1024 | ||
1025 | if (buf[0] & 0x80) | |
1026 | return -ENOENT; | |
1027 | ||
1028 | *tag = buf[0] & 0x1f; | |
1029 | ||
1030 | tf->command = buf[2]; | |
1031 | tf->feature = buf[3]; | |
1032 | tf->lbal = buf[4]; | |
1033 | tf->lbam = buf[5]; | |
1034 | tf->lbah = buf[6]; | |
1035 | tf->device = buf[7]; | |
1036 | tf->hob_lbal = buf[8]; | |
1037 | tf->hob_lbam = buf[9]; | |
1038 | tf->hob_lbah = buf[10]; | |
1039 | tf->nsect = buf[12]; | |
1040 | tf->hob_nsect = buf[13]; | |
1041 | ||
1042 | return 0; | |
1043 | } | |
1044 | ||
022bdb07 TH |
1045 | /** |
1046 | * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE | |
1047 | * @dev: device to perform REQUEST_SENSE to | |
1048 | * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long) | |
1049 | * | |
1050 | * Perform ATAPI REQUEST_SENSE after the device reported CHECK | |
1051 | * SENSE. This function is EH helper. | |
1052 | * | |
1053 | * LOCKING: | |
1054 | * Kernel thread context (may sleep). | |
1055 | * | |
1056 | * RETURNS: | |
1057 | * 0 on success, AC_ERR_* mask on failure | |
1058 | */ | |
56287768 | 1059 | static unsigned int atapi_eh_request_sense(struct ata_queued_cmd *qc) |
022bdb07 | 1060 | { |
56287768 AL |
1061 | struct ata_device *dev = qc->dev; |
1062 | unsigned char *sense_buf = qc->scsicmd->sense_buffer; | |
022bdb07 TH |
1063 | struct ata_port *ap = dev->ap; |
1064 | struct ata_taskfile tf; | |
1065 | u8 cdb[ATAPI_CDB_LEN]; | |
1066 | ||
1067 | DPRINTK("ATAPI request sense\n"); | |
1068 | ||
022bdb07 TH |
1069 | /* FIXME: is this needed? */ |
1070 | memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE); | |
1071 | ||
56287768 AL |
1072 | /* initialize sense_buf with the error register, |
1073 | * for the case where they are -not- overwritten | |
1074 | */ | |
022bdb07 | 1075 | sense_buf[0] = 0x70; |
56287768 AL |
1076 | sense_buf[2] = qc->result_tf.feature >> 4; |
1077 | ||
a617c09f | 1078 | /* some devices time out if garbage left in tf */ |
56287768 | 1079 | ata_tf_init(dev, &tf); |
022bdb07 TH |
1080 | |
1081 | memset(cdb, 0, ATAPI_CDB_LEN); | |
1082 | cdb[0] = REQUEST_SENSE; | |
1083 | cdb[4] = SCSI_SENSE_BUFFERSIZE; | |
1084 | ||
1085 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; | |
1086 | tf.command = ATA_CMD_PACKET; | |
1087 | ||
1088 | /* is it pointless to prefer PIO for "safety reasons"? */ | |
1089 | if (ap->flags & ATA_FLAG_PIO_DMA) { | |
1090 | tf.protocol = ATA_PROT_ATAPI_DMA; | |
1091 | tf.feature |= ATAPI_PKT_DMA; | |
1092 | } else { | |
1093 | tf.protocol = ATA_PROT_ATAPI; | |
1094 | tf.lbam = (8 * 1024) & 0xff; | |
1095 | tf.lbah = (8 * 1024) >> 8; | |
1096 | } | |
1097 | ||
1098 | return ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE, | |
1099 | sense_buf, SCSI_SENSE_BUFFERSIZE); | |
1100 | } | |
1101 | ||
1102 | /** | |
1103 | * ata_eh_analyze_serror - analyze SError for a failed port | |
1104 | * @ap: ATA port to analyze SError for | |
1105 | * | |
1106 | * Analyze SError if available and further determine cause of | |
1107 | * failure. | |
1108 | * | |
1109 | * LOCKING: | |
1110 | * None. | |
1111 | */ | |
1112 | static void ata_eh_analyze_serror(struct ata_port *ap) | |
1113 | { | |
1114 | struct ata_eh_context *ehc = &ap->eh_context; | |
1115 | u32 serror = ehc->i.serror; | |
1116 | unsigned int err_mask = 0, action = 0; | |
1117 | ||
1118 | if (serror & SERR_PERSISTENT) { | |
1119 | err_mask |= AC_ERR_ATA_BUS; | |
1120 | action |= ATA_EH_HARDRESET; | |
1121 | } | |
1122 | if (serror & | |
1123 | (SERR_DATA_RECOVERED | SERR_COMM_RECOVERED | SERR_DATA)) { | |
1124 | err_mask |= AC_ERR_ATA_BUS; | |
1125 | action |= ATA_EH_SOFTRESET; | |
1126 | } | |
1127 | if (serror & SERR_PROTOCOL) { | |
1128 | err_mask |= AC_ERR_HSM; | |
1129 | action |= ATA_EH_SOFTRESET; | |
1130 | } | |
1131 | if (serror & SERR_INTERNAL) { | |
1132 | err_mask |= AC_ERR_SYSTEM; | |
771b8dad | 1133 | action |= ATA_EH_HARDRESET; |
022bdb07 | 1134 | } |
084fe639 TH |
1135 | if (serror & (SERR_PHYRDY_CHG | SERR_DEV_XCHG)) |
1136 | ata_ehi_hotplugged(&ehc->i); | |
022bdb07 TH |
1137 | |
1138 | ehc->i.err_mask |= err_mask; | |
1139 | ehc->i.action |= action; | |
1140 | } | |
1141 | ||
e8ee8451 TH |
1142 | /** |
1143 | * ata_eh_analyze_ncq_error - analyze NCQ error | |
1144 | * @ap: ATA port to analyze NCQ error for | |
1145 | * | |
1146 | * Read log page 10h, determine the offending qc and acquire | |
1147 | * error status TF. For NCQ device errors, all LLDDs have to do | |
1148 | * is setting AC_ERR_DEV in ehi->err_mask. This function takes | |
1149 | * care of the rest. | |
1150 | * | |
1151 | * LOCKING: | |
1152 | * Kernel thread context (may sleep). | |
1153 | */ | |
1154 | static void ata_eh_analyze_ncq_error(struct ata_port *ap) | |
1155 | { | |
1156 | struct ata_eh_context *ehc = &ap->eh_context; | |
1157 | struct ata_device *dev = ap->device; | |
1158 | struct ata_queued_cmd *qc; | |
1159 | struct ata_taskfile tf; | |
1160 | int tag, rc; | |
1161 | ||
1162 | /* if frozen, we can't do much */ | |
b51e9e5d | 1163 | if (ap->pflags & ATA_PFLAG_FROZEN) |
e8ee8451 TH |
1164 | return; |
1165 | ||
1166 | /* is it NCQ device error? */ | |
1167 | if (!ap->sactive || !(ehc->i.err_mask & AC_ERR_DEV)) | |
1168 | return; | |
1169 | ||
1170 | /* has LLDD analyzed already? */ | |
1171 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1172 | qc = __ata_qc_from_tag(ap, tag); | |
1173 | ||
1174 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
1175 | continue; | |
1176 | ||
1177 | if (qc->err_mask) | |
1178 | return; | |
1179 | } | |
1180 | ||
1181 | /* okay, this error is ours */ | |
1182 | rc = ata_eh_read_log_10h(dev, &tag, &tf); | |
1183 | if (rc) { | |
1184 | ata_port_printk(ap, KERN_ERR, "failed to read log page 10h " | |
1185 | "(errno=%d)\n", rc); | |
1186 | return; | |
1187 | } | |
1188 | ||
1189 | if (!(ap->sactive & (1 << tag))) { | |
1190 | ata_port_printk(ap, KERN_ERR, "log page 10h reported " | |
1191 | "inactive tag %d\n", tag); | |
1192 | return; | |
1193 | } | |
1194 | ||
1195 | /* we've got the perpetrator, condemn it */ | |
1196 | qc = __ata_qc_from_tag(ap, tag); | |
1197 | memcpy(&qc->result_tf, &tf, sizeof(tf)); | |
5335b729 | 1198 | qc->err_mask |= AC_ERR_DEV | AC_ERR_NCQ; |
e8ee8451 TH |
1199 | ehc->i.err_mask &= ~AC_ERR_DEV; |
1200 | } | |
1201 | ||
022bdb07 TH |
1202 | /** |
1203 | * ata_eh_analyze_tf - analyze taskfile of a failed qc | |
1204 | * @qc: qc to analyze | |
1205 | * @tf: Taskfile registers to analyze | |
1206 | * | |
1207 | * Analyze taskfile of @qc and further determine cause of | |
1208 | * failure. This function also requests ATAPI sense data if | |
1209 | * avaliable. | |
1210 | * | |
1211 | * LOCKING: | |
1212 | * Kernel thread context (may sleep). | |
1213 | * | |
1214 | * RETURNS: | |
1215 | * Determined recovery action | |
1216 | */ | |
1217 | static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd *qc, | |
1218 | const struct ata_taskfile *tf) | |
1219 | { | |
1220 | unsigned int tmp, action = 0; | |
1221 | u8 stat = tf->command, err = tf->feature; | |
1222 | ||
1223 | if ((stat & (ATA_BUSY | ATA_DRQ | ATA_DRDY)) != ATA_DRDY) { | |
1224 | qc->err_mask |= AC_ERR_HSM; | |
1225 | return ATA_EH_SOFTRESET; | |
1226 | } | |
1227 | ||
a51d644a TH |
1228 | if (stat & (ATA_ERR | ATA_DF)) |
1229 | qc->err_mask |= AC_ERR_DEV; | |
1230 | else | |
022bdb07 TH |
1231 | return 0; |
1232 | ||
1233 | switch (qc->dev->class) { | |
1234 | case ATA_DEV_ATA: | |
1235 | if (err & ATA_ICRC) | |
1236 | qc->err_mask |= AC_ERR_ATA_BUS; | |
1237 | if (err & ATA_UNC) | |
1238 | qc->err_mask |= AC_ERR_MEDIA; | |
1239 | if (err & ATA_IDNF) | |
1240 | qc->err_mask |= AC_ERR_INVALID; | |
1241 | break; | |
1242 | ||
1243 | case ATA_DEV_ATAPI: | |
a569a30d | 1244 | if (!(qc->ap->pflags & ATA_PFLAG_FROZEN)) { |
56287768 | 1245 | tmp = atapi_eh_request_sense(qc); |
a569a30d TH |
1246 | if (!tmp) { |
1247 | /* ATA_QCFLAG_SENSE_VALID is used to | |
1248 | * tell atapi_qc_complete() that sense | |
1249 | * data is already valid. | |
1250 | * | |
1251 | * TODO: interpret sense data and set | |
1252 | * appropriate err_mask. | |
1253 | */ | |
1254 | qc->flags |= ATA_QCFLAG_SENSE_VALID; | |
1255 | } else | |
1256 | qc->err_mask |= tmp; | |
1257 | } | |
022bdb07 TH |
1258 | } |
1259 | ||
1260 | if (qc->err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT | AC_ERR_ATA_BUS)) | |
1261 | action |= ATA_EH_SOFTRESET; | |
1262 | ||
1263 | return action; | |
1264 | } | |
1265 | ||
7d47e8d4 | 1266 | static int ata_eh_categorize_error(int is_io, unsigned int err_mask) |
022bdb07 | 1267 | { |
7d47e8d4 | 1268 | if (err_mask & AC_ERR_ATA_BUS) |
022bdb07 TH |
1269 | return 1; |
1270 | ||
7d47e8d4 TH |
1271 | if (err_mask & AC_ERR_TIMEOUT) |
1272 | return 2; | |
1273 | ||
1274 | if (is_io) { | |
1275 | if (err_mask & AC_ERR_HSM) | |
022bdb07 | 1276 | return 2; |
7d47e8d4 TH |
1277 | if ((err_mask & |
1278 | (AC_ERR_DEV|AC_ERR_MEDIA|AC_ERR_INVALID)) == AC_ERR_DEV) | |
1279 | return 3; | |
022bdb07 TH |
1280 | } |
1281 | ||
1282 | return 0; | |
1283 | } | |
1284 | ||
7d47e8d4 | 1285 | struct speed_down_verdict_arg { |
022bdb07 | 1286 | u64 since; |
7d47e8d4 | 1287 | int nr_errors[4]; |
022bdb07 TH |
1288 | }; |
1289 | ||
7d47e8d4 | 1290 | static int speed_down_verdict_cb(struct ata_ering_entry *ent, void *void_arg) |
022bdb07 | 1291 | { |
7d47e8d4 TH |
1292 | struct speed_down_verdict_arg *arg = void_arg; |
1293 | int cat = ata_eh_categorize_error(ent->is_io, ent->err_mask); | |
022bdb07 TH |
1294 | |
1295 | if (ent->timestamp < arg->since) | |
1296 | return -1; | |
1297 | ||
7d47e8d4 | 1298 | arg->nr_errors[cat]++; |
022bdb07 TH |
1299 | return 0; |
1300 | } | |
1301 | ||
1302 | /** | |
7d47e8d4 | 1303 | * ata_eh_speed_down_verdict - Determine speed down verdict |
022bdb07 TH |
1304 | * @dev: Device of interest |
1305 | * | |
1306 | * This function examines error ring of @dev and determines | |
7d47e8d4 TH |
1307 | * whether NCQ needs to be turned off, transfer speed should be |
1308 | * stepped down, or falling back to PIO is necessary. | |
022bdb07 | 1309 | * |
7d47e8d4 | 1310 | * Cat-1 is ATA_BUS error for any command. |
022bdb07 | 1311 | * |
7d47e8d4 TH |
1312 | * Cat-2 is TIMEOUT for any command or HSM violation for known |
1313 | * supported commands. | |
1314 | * | |
1315 | * Cat-3 is is unclassified DEV error for known supported | |
022bdb07 TH |
1316 | * command. |
1317 | * | |
7d47e8d4 TH |
1318 | * NCQ needs to be turned off if there have been more than 3 |
1319 | * Cat-2 + Cat-3 errors during last 10 minutes. | |
1320 | * | |
1321 | * Speed down is necessary if there have been more than 3 Cat-1 + | |
1322 | * Cat-2 errors or 10 Cat-3 errors during last 10 minutes. | |
1323 | * | |
1324 | * Falling back to PIO mode is necessary if there have been more | |
1325 | * than 10 Cat-1 + Cat-2 + Cat-3 errors during last 5 minutes. | |
1326 | * | |
022bdb07 TH |
1327 | * LOCKING: |
1328 | * Inherited from caller. | |
1329 | * | |
1330 | * RETURNS: | |
7d47e8d4 | 1331 | * OR of ATA_EH_SPDN_* flags. |
022bdb07 | 1332 | */ |
7d47e8d4 | 1333 | static unsigned int ata_eh_speed_down_verdict(struct ata_device *dev) |
022bdb07 | 1334 | { |
7d47e8d4 TH |
1335 | const u64 j5mins = 5LLU * 60 * HZ, j10mins = 10LLU * 60 * HZ; |
1336 | u64 j64 = get_jiffies_64(); | |
1337 | struct speed_down_verdict_arg arg; | |
1338 | unsigned int verdict = 0; | |
022bdb07 | 1339 | |
7d47e8d4 TH |
1340 | /* scan past 10 mins of error history */ |
1341 | memset(&arg, 0, sizeof(arg)); | |
1342 | arg.since = j64 - min(j64, j10mins); | |
1343 | ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg); | |
022bdb07 | 1344 | |
7d47e8d4 TH |
1345 | if (arg.nr_errors[2] + arg.nr_errors[3] > 3) |
1346 | verdict |= ATA_EH_SPDN_NCQ_OFF; | |
1347 | if (arg.nr_errors[1] + arg.nr_errors[2] > 3 || arg.nr_errors[3] > 10) | |
1348 | verdict |= ATA_EH_SPDN_SPEED_DOWN; | |
022bdb07 | 1349 | |
7d47e8d4 | 1350 | /* scan past 3 mins of error history */ |
022bdb07 | 1351 | memset(&arg, 0, sizeof(arg)); |
7d47e8d4 TH |
1352 | arg.since = j64 - min(j64, j5mins); |
1353 | ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg); | |
022bdb07 | 1354 | |
7d47e8d4 TH |
1355 | if (arg.nr_errors[1] + arg.nr_errors[2] + arg.nr_errors[3] > 10) |
1356 | verdict |= ATA_EH_SPDN_FALLBACK_TO_PIO; | |
022bdb07 | 1357 | |
7d47e8d4 | 1358 | return verdict; |
022bdb07 TH |
1359 | } |
1360 | ||
1361 | /** | |
1362 | * ata_eh_speed_down - record error and speed down if necessary | |
1363 | * @dev: Failed device | |
1364 | * @is_io: Did the device fail during normal IO? | |
1365 | * @err_mask: err_mask of the error | |
1366 | * | |
1367 | * Record error and examine error history to determine whether | |
1368 | * adjusting transmission speed is necessary. It also sets | |
1369 | * transmission limits appropriately if such adjustment is | |
1370 | * necessary. | |
1371 | * | |
1372 | * LOCKING: | |
1373 | * Kernel thread context (may sleep). | |
1374 | * | |
1375 | * RETURNS: | |
7d47e8d4 | 1376 | * Determined recovery action. |
022bdb07 | 1377 | */ |
7d47e8d4 TH |
1378 | static unsigned int ata_eh_speed_down(struct ata_device *dev, int is_io, |
1379 | unsigned int err_mask) | |
022bdb07 | 1380 | { |
7d47e8d4 TH |
1381 | unsigned int verdict; |
1382 | unsigned int action = 0; | |
1383 | ||
1384 | /* don't bother if Cat-0 error */ | |
1385 | if (ata_eh_categorize_error(is_io, err_mask) == 0) | |
022bdb07 TH |
1386 | return 0; |
1387 | ||
1388 | /* record error and determine whether speed down is necessary */ | |
1389 | ata_ering_record(&dev->ering, is_io, err_mask); | |
7d47e8d4 | 1390 | verdict = ata_eh_speed_down_verdict(dev); |
022bdb07 | 1391 | |
7d47e8d4 TH |
1392 | /* turn off NCQ? */ |
1393 | if ((verdict & ATA_EH_SPDN_NCQ_OFF) && | |
1394 | (dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ | | |
1395 | ATA_DFLAG_NCQ_OFF)) == ATA_DFLAG_NCQ) { | |
1396 | dev->flags |= ATA_DFLAG_NCQ_OFF; | |
1397 | ata_dev_printk(dev, KERN_WARNING, | |
1398 | "NCQ disabled due to excessive errors\n"); | |
1399 | goto done; | |
1400 | } | |
022bdb07 | 1401 | |
7d47e8d4 TH |
1402 | /* speed down? */ |
1403 | if (verdict & ATA_EH_SPDN_SPEED_DOWN) { | |
1404 | /* speed down SATA link speed if possible */ | |
1405 | if (sata_down_spd_limit(dev->ap) == 0) { | |
1406 | action |= ATA_EH_HARDRESET; | |
1407 | goto done; | |
1408 | } | |
022bdb07 | 1409 | |
7d47e8d4 TH |
1410 | /* lower transfer mode */ |
1411 | if (dev->spdn_cnt < 2) { | |
1412 | static const int dma_dnxfer_sel[] = | |
1413 | { ATA_DNXFER_DMA, ATA_DNXFER_40C }; | |
1414 | static const int pio_dnxfer_sel[] = | |
1415 | { ATA_DNXFER_PIO, ATA_DNXFER_FORCE_PIO0 }; | |
1416 | int sel; | |
1417 | ||
1418 | if (dev->xfer_shift != ATA_SHIFT_PIO) | |
1419 | sel = dma_dnxfer_sel[dev->spdn_cnt]; | |
1420 | else | |
1421 | sel = pio_dnxfer_sel[dev->spdn_cnt]; | |
1422 | ||
1423 | dev->spdn_cnt++; | |
1424 | ||
1425 | if (ata_down_xfermask_limit(dev, sel) == 0) { | |
1426 | action |= ATA_EH_SOFTRESET; | |
1427 | goto done; | |
1428 | } | |
1429 | } | |
1430 | } | |
1431 | ||
1432 | /* Fall back to PIO? Slowing down to PIO is meaningless for | |
1433 | * SATA. Consider it only for PATA. | |
1434 | */ | |
1435 | if ((verdict & ATA_EH_SPDN_FALLBACK_TO_PIO) && (dev->spdn_cnt >= 2) && | |
1436 | (dev->ap->cbl != ATA_CBL_SATA) && | |
1437 | (dev->xfer_shift != ATA_SHIFT_PIO)) { | |
1438 | if (ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO) == 0) { | |
1439 | dev->spdn_cnt = 0; | |
1440 | action |= ATA_EH_SOFTRESET; | |
1441 | goto done; | |
1442 | } | |
1443 | } | |
022bdb07 | 1444 | |
022bdb07 | 1445 | return 0; |
7d47e8d4 TH |
1446 | done: |
1447 | /* device has been slowed down, blow error history */ | |
1448 | ata_ering_clear(&dev->ering); | |
1449 | return action; | |
022bdb07 TH |
1450 | } |
1451 | ||
1452 | /** | |
1453 | * ata_eh_autopsy - analyze error and determine recovery action | |
1454 | * @ap: ATA port to perform autopsy on | |
1455 | * | |
1456 | * Analyze why @ap failed and determine which recovery action is | |
1457 | * needed. This function also sets more detailed AC_ERR_* values | |
1458 | * and fills sense data for ATAPI CHECK SENSE. | |
1459 | * | |
1460 | * LOCKING: | |
1461 | * Kernel thread context (may sleep). | |
1462 | */ | |
1463 | static void ata_eh_autopsy(struct ata_port *ap) | |
1464 | { | |
1465 | struct ata_eh_context *ehc = &ap->eh_context; | |
022bdb07 TH |
1466 | unsigned int all_err_mask = 0; |
1467 | int tag, is_io = 0; | |
1468 | u32 serror; | |
1469 | int rc; | |
1470 | ||
1471 | DPRINTK("ENTER\n"); | |
1472 | ||
1cdaf534 TH |
1473 | if (ehc->i.flags & ATA_EHI_NO_AUTOPSY) |
1474 | return; | |
1475 | ||
022bdb07 TH |
1476 | /* obtain and analyze SError */ |
1477 | rc = sata_scr_read(ap, SCR_ERROR, &serror); | |
1478 | if (rc == 0) { | |
1479 | ehc->i.serror |= serror; | |
1480 | ata_eh_analyze_serror(ap); | |
1481 | } else if (rc != -EOPNOTSUPP) | |
4528e4da | 1482 | ehc->i.action |= ATA_EH_HARDRESET; |
022bdb07 | 1483 | |
e8ee8451 TH |
1484 | /* analyze NCQ failure */ |
1485 | ata_eh_analyze_ncq_error(ap); | |
1486 | ||
022bdb07 TH |
1487 | /* any real error trumps AC_ERR_OTHER */ |
1488 | if (ehc->i.err_mask & ~AC_ERR_OTHER) | |
1489 | ehc->i.err_mask &= ~AC_ERR_OTHER; | |
1490 | ||
1491 | all_err_mask |= ehc->i.err_mask; | |
1492 | ||
1493 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1494 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
1495 | ||
1496 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
1497 | continue; | |
1498 | ||
1499 | /* inherit upper level err_mask */ | |
1500 | qc->err_mask |= ehc->i.err_mask; | |
1501 | ||
022bdb07 | 1502 | /* analyze TF */ |
4528e4da | 1503 | ehc->i.action |= ata_eh_analyze_tf(qc, &qc->result_tf); |
022bdb07 TH |
1504 | |
1505 | /* DEV errors are probably spurious in case of ATA_BUS error */ | |
1506 | if (qc->err_mask & AC_ERR_ATA_BUS) | |
1507 | qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_MEDIA | | |
1508 | AC_ERR_INVALID); | |
1509 | ||
1510 | /* any real error trumps unknown error */ | |
1511 | if (qc->err_mask & ~AC_ERR_OTHER) | |
1512 | qc->err_mask &= ~AC_ERR_OTHER; | |
1513 | ||
1514 | /* SENSE_VALID trumps dev/unknown error and revalidation */ | |
1515 | if (qc->flags & ATA_QCFLAG_SENSE_VALID) { | |
1516 | qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_OTHER); | |
4528e4da | 1517 | ehc->i.action &= ~ATA_EH_REVALIDATE; |
022bdb07 TH |
1518 | } |
1519 | ||
1520 | /* accumulate error info */ | |
4528e4da | 1521 | ehc->i.dev = qc->dev; |
022bdb07 TH |
1522 | all_err_mask |= qc->err_mask; |
1523 | if (qc->flags & ATA_QCFLAG_IO) | |
1524 | is_io = 1; | |
1525 | } | |
1526 | ||
a20f33ff | 1527 | /* enforce default EH actions */ |
b51e9e5d | 1528 | if (ap->pflags & ATA_PFLAG_FROZEN || |
a20f33ff | 1529 | all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT)) |
4528e4da | 1530 | ehc->i.action |= ATA_EH_SOFTRESET; |
a20f33ff | 1531 | else if (all_err_mask) |
4528e4da | 1532 | ehc->i.action |= ATA_EH_REVALIDATE; |
022bdb07 | 1533 | |
47005f25 | 1534 | /* if we have offending qcs and the associated failed device */ |
4528e4da | 1535 | if (ehc->i.dev) { |
47005f25 | 1536 | /* speed down */ |
4528e4da TH |
1537 | ehc->i.action |= ata_eh_speed_down(ehc->i.dev, is_io, |
1538 | all_err_mask); | |
47005f25 TH |
1539 | |
1540 | /* perform per-dev EH action only on the offending device */ | |
4528e4da TH |
1541 | ehc->i.dev_action[ehc->i.dev->devno] |= |
1542 | ehc->i.action & ATA_EH_PERDEV_MASK; | |
1543 | ehc->i.action &= ~ATA_EH_PERDEV_MASK; | |
47005f25 TH |
1544 | } |
1545 | ||
022bdb07 TH |
1546 | DPRINTK("EXIT\n"); |
1547 | } | |
1548 | ||
1549 | /** | |
1550 | * ata_eh_report - report error handling to user | |
1551 | * @ap: ATA port EH is going on | |
1552 | * | |
1553 | * Report EH to user. | |
1554 | * | |
1555 | * LOCKING: | |
1556 | * None. | |
1557 | */ | |
1558 | static void ata_eh_report(struct ata_port *ap) | |
1559 | { | |
1560 | struct ata_eh_context *ehc = &ap->eh_context; | |
1561 | const char *frozen, *desc; | |
1562 | int tag, nr_failed = 0; | |
1563 | ||
1564 | desc = NULL; | |
1565 | if (ehc->i.desc[0] != '\0') | |
1566 | desc = ehc->i.desc; | |
1567 | ||
1568 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1569 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
1570 | ||
1571 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
1572 | continue; | |
1573 | if (qc->flags & ATA_QCFLAG_SENSE_VALID && !qc->err_mask) | |
1574 | continue; | |
1575 | ||
1576 | nr_failed++; | |
1577 | } | |
1578 | ||
1579 | if (!nr_failed && !ehc->i.err_mask) | |
1580 | return; | |
1581 | ||
1582 | frozen = ""; | |
b51e9e5d | 1583 | if (ap->pflags & ATA_PFLAG_FROZEN) |
022bdb07 TH |
1584 | frozen = " frozen"; |
1585 | ||
1586 | if (ehc->i.dev) { | |
e8ee8451 TH |
1587 | ata_dev_printk(ehc->i.dev, KERN_ERR, "exception Emask 0x%x " |
1588 | "SAct 0x%x SErr 0x%x action 0x%x%s\n", | |
1589 | ehc->i.err_mask, ap->sactive, ehc->i.serror, | |
1590 | ehc->i.action, frozen); | |
022bdb07 | 1591 | if (desc) |
b64bbc39 | 1592 | ata_dev_printk(ehc->i.dev, KERN_ERR, "%s\n", desc); |
022bdb07 | 1593 | } else { |
e8ee8451 TH |
1594 | ata_port_printk(ap, KERN_ERR, "exception Emask 0x%x " |
1595 | "SAct 0x%x SErr 0x%x action 0x%x%s\n", | |
1596 | ehc->i.err_mask, ap->sactive, ehc->i.serror, | |
1597 | ehc->i.action, frozen); | |
022bdb07 | 1598 | if (desc) |
b64bbc39 | 1599 | ata_port_printk(ap, KERN_ERR, "%s\n", desc); |
022bdb07 TH |
1600 | } |
1601 | ||
1602 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
8a937581 TH |
1603 | static const char *dma_str[] = { |
1604 | [DMA_BIDIRECTIONAL] = "bidi", | |
1605 | [DMA_TO_DEVICE] = "out", | |
1606 | [DMA_FROM_DEVICE] = "in", | |
1607 | [DMA_NONE] = "", | |
1608 | }; | |
022bdb07 | 1609 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); |
8a937581 | 1610 | struct ata_taskfile *cmd = &qc->tf, *res = &qc->result_tf; |
022bdb07 TH |
1611 | |
1612 | if (!(qc->flags & ATA_QCFLAG_FAILED) || !qc->err_mask) | |
1613 | continue; | |
1614 | ||
8a937581 TH |
1615 | ata_dev_printk(qc->dev, KERN_ERR, |
1616 | "cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x " | |
664e8503 | 1617 | "tag %d cdb 0x%x data %u %s\n " |
8a937581 | 1618 | "res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x " |
5335b729 | 1619 | "Emask 0x%x (%s)%s\n", |
8a937581 TH |
1620 | cmd->command, cmd->feature, cmd->nsect, |
1621 | cmd->lbal, cmd->lbam, cmd->lbah, | |
1622 | cmd->hob_feature, cmd->hob_nsect, | |
1623 | cmd->hob_lbal, cmd->hob_lbam, cmd->hob_lbah, | |
726f0785 | 1624 | cmd->device, qc->tag, qc->cdb[0], qc->nbytes, |
664e8503 | 1625 | dma_str[qc->dma_dir], |
8a937581 TH |
1626 | res->command, res->feature, res->nsect, |
1627 | res->lbal, res->lbam, res->lbah, | |
1628 | res->hob_feature, res->hob_nsect, | |
1629 | res->hob_lbal, res->hob_lbam, res->hob_lbah, | |
5335b729 TH |
1630 | res->device, qc->err_mask, ata_err_string(qc->err_mask), |
1631 | qc->err_mask & AC_ERR_NCQ ? " <F>" : ""); | |
022bdb07 TH |
1632 | } |
1633 | } | |
1634 | ||
d87fa38e | 1635 | static int ata_do_reset(struct ata_port *ap, ata_reset_fn_t reset, |
d4b2bab4 | 1636 | unsigned int *classes, unsigned long deadline) |
d87fa38e TH |
1637 | { |
1638 | int i, rc; | |
1639 | ||
1640 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1641 | classes[i] = ATA_DEV_UNKNOWN; | |
1642 | ||
d4b2bab4 | 1643 | rc = reset(ap, classes, deadline); |
d87fa38e TH |
1644 | if (rc) |
1645 | return rc; | |
1646 | ||
1647 | /* If any class isn't ATA_DEV_UNKNOWN, consider classification | |
1648 | * is complete and convert all ATA_DEV_UNKNOWN to | |
1649 | * ATA_DEV_NONE. | |
1650 | */ | |
1651 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1652 | if (classes[i] != ATA_DEV_UNKNOWN) | |
1653 | break; | |
1654 | ||
1655 | if (i < ATA_MAX_DEVICES) | |
1656 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1657 | if (classes[i] == ATA_DEV_UNKNOWN) | |
1658 | classes[i] = ATA_DEV_NONE; | |
1659 | ||
1660 | return 0; | |
1661 | } | |
1662 | ||
664faf09 TH |
1663 | static int ata_eh_followup_srst_needed(int rc, int classify, |
1664 | const unsigned int *classes) | |
1665 | { | |
1666 | if (rc == -EAGAIN) | |
1667 | return 1; | |
1668 | if (rc != 0) | |
1669 | return 0; | |
1670 | if (classify && classes[0] == ATA_DEV_UNKNOWN) | |
1671 | return 1; | |
1672 | return 0; | |
1673 | } | |
1674 | ||
1675 | static int ata_eh_reset(struct ata_port *ap, int classify, | |
f5914a46 | 1676 | ata_prereset_fn_t prereset, ata_reset_fn_t softreset, |
022bdb07 TH |
1677 | ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) |
1678 | { | |
1679 | struct ata_eh_context *ehc = &ap->eh_context; | |
664faf09 | 1680 | unsigned int *classes = ehc->classes; |
1cdaf534 | 1681 | int verbose = !(ehc->i.flags & ATA_EHI_QUIET); |
31daabda TH |
1682 | int try = 0; |
1683 | unsigned long deadline; | |
f5914a46 | 1684 | unsigned int action; |
022bdb07 | 1685 | ata_reset_fn_t reset; |
8b5bb2fa | 1686 | int i, rc; |
022bdb07 | 1687 | |
13abf50d TH |
1688 | /* about to reset */ |
1689 | ata_eh_about_to_do(ap, NULL, ehc->i.action & ATA_EH_RESET_MASK); | |
1690 | ||
f5914a46 TH |
1691 | /* Determine which reset to use and record in ehc->i.action. |
1692 | * prereset() may examine and modify it. | |
1693 | */ | |
1694 | action = ehc->i.action; | |
1695 | ehc->i.action &= ~ATA_EH_RESET_MASK; | |
022bdb07 | 1696 | if (softreset && (!hardreset || (!sata_set_spd_needed(ap) && |
f5914a46 TH |
1697 | !(action & ATA_EH_HARDRESET)))) |
1698 | ehc->i.action |= ATA_EH_SOFTRESET; | |
022bdb07 | 1699 | else |
f5914a46 TH |
1700 | ehc->i.action |= ATA_EH_HARDRESET; |
1701 | ||
1702 | if (prereset) { | |
31daabda | 1703 | rc = prereset(ap, jiffies + ATA_EH_PRERESET_TIMEOUT); |
f5914a46 | 1704 | if (rc) { |
c961922b | 1705 | if (rc == -ENOENT) { |
4aa9ab67 TH |
1706 | ata_port_printk(ap, KERN_DEBUG, |
1707 | "port disabled. ignoring.\n"); | |
c961922b | 1708 | ap->eh_context.i.action &= ~ATA_EH_RESET_MASK; |
4aa9ab67 TH |
1709 | |
1710 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1711 | classes[i] = ATA_DEV_NONE; | |
1712 | ||
1713 | rc = 0; | |
c961922b AC |
1714 | } else |
1715 | ata_port_printk(ap, KERN_ERR, | |
f5914a46 TH |
1716 | "prereset failed (errno=%d)\n", rc); |
1717 | return rc; | |
1718 | } | |
1719 | } | |
1720 | ||
1721 | /* prereset() might have modified ehc->i.action */ | |
1722 | if (ehc->i.action & ATA_EH_HARDRESET) | |
022bdb07 | 1723 | reset = hardreset; |
f5914a46 TH |
1724 | else if (ehc->i.action & ATA_EH_SOFTRESET) |
1725 | reset = softreset; | |
1726 | else { | |
1727 | /* prereset told us not to reset, bang classes and return */ | |
1728 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1729 | classes[i] = ATA_DEV_NONE; | |
1730 | return 0; | |
1731 | } | |
1732 | ||
1733 | /* did prereset() screw up? if so, fix up to avoid oopsing */ | |
1734 | if (!reset) { | |
f5914a46 TH |
1735 | if (softreset) |
1736 | reset = softreset; | |
1737 | else | |
1738 | reset = hardreset; | |
1739 | } | |
022bdb07 TH |
1740 | |
1741 | retry: | |
31daabda TH |
1742 | deadline = jiffies + ata_eh_reset_timeouts[try++]; |
1743 | ||
3e706399 TH |
1744 | /* shut up during boot probing */ |
1745 | if (verbose) | |
1746 | ata_port_printk(ap, KERN_INFO, "%s resetting port\n", | |
1747 | reset == softreset ? "soft" : "hard"); | |
022bdb07 | 1748 | |
13abf50d | 1749 | /* mark that this EH session started with reset */ |
0d64a233 TH |
1750 | if (reset == hardreset) |
1751 | ehc->i.flags |= ATA_EHI_DID_HARDRESET; | |
1752 | else | |
1753 | ehc->i.flags |= ATA_EHI_DID_SOFTRESET; | |
022bdb07 | 1754 | |
31daabda | 1755 | rc = ata_do_reset(ap, reset, classes, deadline); |
022bdb07 | 1756 | |
664faf09 TH |
1757 | if (reset == hardreset && |
1758 | ata_eh_followup_srst_needed(rc, classify, classes)) { | |
1759 | /* okay, let's do follow-up softreset */ | |
664faf09 TH |
1760 | reset = softreset; |
1761 | ||
1762 | if (!reset) { | |
1763 | ata_port_printk(ap, KERN_ERR, | |
1764 | "follow-up softreset required " | |
1765 | "but no softreset avaliable\n"); | |
1766 | return -EINVAL; | |
1767 | } | |
1768 | ||
47005f25 | 1769 | ata_eh_about_to_do(ap, NULL, ATA_EH_RESET_MASK); |
31daabda | 1770 | rc = ata_do_reset(ap, reset, classes, deadline); |
664faf09 TH |
1771 | |
1772 | if (rc == 0 && classify && | |
1773 | classes[0] == ATA_DEV_UNKNOWN) { | |
1774 | ata_port_printk(ap, KERN_ERR, | |
1775 | "classification failed\n"); | |
1776 | return -EINVAL; | |
1777 | } | |
1778 | } | |
1779 | ||
31daabda TH |
1780 | if (rc && try < ARRAY_SIZE(ata_eh_reset_timeouts)) { |
1781 | unsigned long now = jiffies; | |
664faf09 | 1782 | |
31daabda TH |
1783 | if (time_before(now, deadline)) { |
1784 | unsigned long delta = deadline - jiffies; | |
664faf09 | 1785 | |
31daabda TH |
1786 | ata_port_printk(ap, KERN_WARNING, "reset failed " |
1787 | "(errno=%d), retrying in %u secs\n", | |
1788 | rc, (jiffies_to_msecs(delta) + 999) / 1000); | |
1789 | ||
1790 | schedule_timeout_uninterruptible(delta); | |
1791 | } | |
022bdb07 | 1792 | |
31daabda TH |
1793 | if (reset == hardreset && |
1794 | try == ARRAY_SIZE(ata_eh_reset_timeouts) - 1) | |
022bdb07 TH |
1795 | sata_down_spd_limit(ap); |
1796 | if (hardreset) | |
1797 | reset = hardreset; | |
1798 | goto retry; | |
1799 | } | |
1800 | ||
1801 | if (rc == 0) { | |
20952b69 TH |
1802 | /* After the reset, the device state is PIO 0 and the |
1803 | * controller state is undefined. Record the mode. | |
1804 | */ | |
1805 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1806 | ap->device[i].pio_mode = XFER_PIO_0; | |
1807 | ||
022bdb07 TH |
1808 | if (postreset) |
1809 | postreset(ap, classes); | |
1810 | ||
1811 | /* reset successful, schedule revalidation */ | |
13abf50d | 1812 | ata_eh_done(ap, NULL, ehc->i.action & ATA_EH_RESET_MASK); |
022bdb07 TH |
1813 | ehc->i.action |= ATA_EH_REVALIDATE; |
1814 | } | |
1815 | ||
1816 | return rc; | |
1817 | } | |
1818 | ||
084fe639 TH |
1819 | static int ata_eh_revalidate_and_attach(struct ata_port *ap, |
1820 | struct ata_device **r_failed_dev) | |
022bdb07 TH |
1821 | { |
1822 | struct ata_eh_context *ehc = &ap->eh_context; | |
1823 | struct ata_device *dev; | |
8c3c52a8 | 1824 | unsigned int new_mask = 0; |
084fe639 | 1825 | unsigned long flags; |
022bdb07 TH |
1826 | int i, rc = 0; |
1827 | ||
1828 | DPRINTK("ENTER\n"); | |
1829 | ||
8c3c52a8 TH |
1830 | /* For PATA drive side cable detection to work, IDENTIFY must |
1831 | * be done backwards such that PDIAG- is released by the slave | |
1832 | * device before the master device is identified. | |
1833 | */ | |
1834 | for (i = ATA_MAX_DEVICES - 1; i >= 0; i--) { | |
bff04647 | 1835 | unsigned int action, readid_flags = 0; |
47005f25 | 1836 | |
022bdb07 | 1837 | dev = &ap->device[i]; |
64f65ca6 | 1838 | action = ata_eh_dev_action(dev); |
022bdb07 | 1839 | |
bff04647 TH |
1840 | if (ehc->i.flags & ATA_EHI_DID_RESET) |
1841 | readid_flags |= ATA_READID_POSTRESET; | |
1842 | ||
9666f400 | 1843 | if ((action & ATA_EH_REVALIDATE) && ata_dev_enabled(dev)) { |
022bdb07 TH |
1844 | if (ata_port_offline(ap)) { |
1845 | rc = -EIO; | |
8c3c52a8 | 1846 | goto err; |
022bdb07 TH |
1847 | } |
1848 | ||
47005f25 | 1849 | ata_eh_about_to_do(ap, dev, ATA_EH_REVALIDATE); |
bff04647 | 1850 | rc = ata_dev_revalidate(dev, readid_flags); |
022bdb07 | 1851 | if (rc) |
8c3c52a8 | 1852 | goto err; |
022bdb07 | 1853 | |
47005f25 TH |
1854 | ata_eh_done(ap, dev, ATA_EH_REVALIDATE); |
1855 | ||
baa1e78a TH |
1856 | /* Configuration may have changed, reconfigure |
1857 | * transfer mode. | |
1858 | */ | |
1859 | ehc->i.flags |= ATA_EHI_SETMODE; | |
1860 | ||
3057ac3c | 1861 | /* schedule the scsi_rescan_device() here */ |
1862 | queue_work(ata_aux_wq, &(ap->scsi_rescan_task)); | |
084fe639 TH |
1863 | } else if (dev->class == ATA_DEV_UNKNOWN && |
1864 | ehc->tries[dev->devno] && | |
1865 | ata_class_enabled(ehc->classes[dev->devno])) { | |
1866 | dev->class = ehc->classes[dev->devno]; | |
1867 | ||
bff04647 TH |
1868 | rc = ata_dev_read_id(dev, &dev->class, readid_flags, |
1869 | dev->id); | |
8c3c52a8 TH |
1870 | switch (rc) { |
1871 | case 0: | |
1872 | new_mask |= 1 << i; | |
1873 | break; | |
1874 | case -ENOENT: | |
55a8e2c8 TH |
1875 | /* IDENTIFY was issued to non-existent |
1876 | * device. No need to reset. Just | |
1877 | * thaw and kill the device. | |
1878 | */ | |
1879 | ata_eh_thaw_port(ap); | |
084fe639 TH |
1880 | dev->class = ATA_DEV_UNKNOWN; |
1881 | break; | |
8c3c52a8 TH |
1882 | default: |
1883 | dev->class = ATA_DEV_UNKNOWN; | |
1884 | goto err; | |
084fe639 | 1885 | } |
8c3c52a8 TH |
1886 | } |
1887 | } | |
084fe639 | 1888 | |
c1c4e8d5 TH |
1889 | /* PDIAG- should have been released, ask cable type if post-reset */ |
1890 | if ((ehc->i.flags & ATA_EHI_DID_RESET) && ap->ops->cable_detect) | |
1891 | ap->cbl = ap->ops->cable_detect(ap); | |
1892 | ||
8c3c52a8 TH |
1893 | /* Configure new devices forward such that user doesn't see |
1894 | * device detection messages backwards. | |
1895 | */ | |
1896 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
1897 | dev = &ap->device[i]; | |
baa1e78a | 1898 | |
8c3c52a8 TH |
1899 | if (!(new_mask & (1 << i))) |
1900 | continue; | |
1901 | ||
1902 | ehc->i.flags |= ATA_EHI_PRINTINFO; | |
1903 | rc = ata_dev_configure(dev); | |
1904 | ehc->i.flags &= ~ATA_EHI_PRINTINFO; | |
1905 | if (rc) | |
1906 | goto err; | |
1907 | ||
1908 | spin_lock_irqsave(ap->lock, flags); | |
1909 | ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG; | |
1910 | spin_unlock_irqrestore(ap->lock, flags); | |
1911 | ||
1912 | /* new device discovered, configure xfermode */ | |
1913 | ehc->i.flags |= ATA_EHI_SETMODE; | |
022bdb07 TH |
1914 | } |
1915 | ||
8c3c52a8 | 1916 | return 0; |
022bdb07 | 1917 | |
8c3c52a8 TH |
1918 | err: |
1919 | *r_failed_dev = dev; | |
1920 | DPRINTK("EXIT rc=%d\n", rc); | |
022bdb07 TH |
1921 | return rc; |
1922 | } | |
1923 | ||
1924 | static int ata_port_nr_enabled(struct ata_port *ap) | |
1925 | { | |
1926 | int i, cnt = 0; | |
1927 | ||
1928 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1929 | if (ata_dev_enabled(&ap->device[i])) | |
1930 | cnt++; | |
1931 | return cnt; | |
1932 | } | |
1933 | ||
084fe639 TH |
1934 | static int ata_port_nr_vacant(struct ata_port *ap) |
1935 | { | |
1936 | int i, cnt = 0; | |
1937 | ||
1938 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1939 | if (ap->device[i].class == ATA_DEV_UNKNOWN) | |
1940 | cnt++; | |
1941 | return cnt; | |
1942 | } | |
1943 | ||
1944 | static int ata_eh_skip_recovery(struct ata_port *ap) | |
1945 | { | |
1946 | struct ata_eh_context *ehc = &ap->eh_context; | |
1947 | int i; | |
1948 | ||
7c8c2cff TH |
1949 | /* thaw frozen port, resume link and recover failed devices */ |
1950 | if ((ap->pflags & ATA_PFLAG_FROZEN) || | |
1951 | (ehc->i.flags & ATA_EHI_RESUME_LINK) || ata_port_nr_enabled(ap)) | |
084fe639 TH |
1952 | return 0; |
1953 | ||
1954 | /* skip if class codes for all vacant slots are ATA_DEV_NONE */ | |
1955 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
1956 | struct ata_device *dev = &ap->device[i]; | |
1957 | ||
1958 | if (dev->class == ATA_DEV_UNKNOWN && | |
1959 | ehc->classes[dev->devno] != ATA_DEV_NONE) | |
1960 | return 0; | |
1961 | } | |
1962 | ||
1963 | return 1; | |
1964 | } | |
1965 | ||
fee7ca72 TH |
1966 | static void ata_eh_handle_dev_fail(struct ata_device *dev, int err) |
1967 | { | |
1968 | struct ata_port *ap = dev->ap; | |
1969 | struct ata_eh_context *ehc = &ap->eh_context; | |
1970 | ||
1971 | ehc->tries[dev->devno]--; | |
1972 | ||
1973 | switch (err) { | |
1974 | case -ENODEV: | |
1975 | /* device missing or wrong IDENTIFY data, schedule probing */ | |
1976 | ehc->i.probe_mask |= (1 << dev->devno); | |
1977 | case -EINVAL: | |
1978 | /* give it just one more chance */ | |
1979 | ehc->tries[dev->devno] = min(ehc->tries[dev->devno], 1); | |
1980 | case -EIO: | |
1981 | if (ehc->tries[dev->devno] == 1) { | |
1982 | /* This is the last chance, better to slow | |
1983 | * down than lose it. | |
1984 | */ | |
1985 | sata_down_spd_limit(ap); | |
1986 | ata_down_xfermask_limit(dev, ATA_DNXFER_PIO); | |
1987 | } | |
1988 | } | |
1989 | ||
1990 | if (ata_dev_enabled(dev) && !ehc->tries[dev->devno]) { | |
1991 | /* disable device if it has used up all its chances */ | |
1992 | ata_dev_disable(dev); | |
1993 | ||
1994 | /* detach if offline */ | |
1995 | if (ata_port_offline(ap)) | |
1996 | ata_eh_detach_dev(dev); | |
1997 | ||
1998 | /* probe if requested */ | |
1999 | if ((ehc->i.probe_mask & (1 << dev->devno)) && | |
2000 | !(ehc->did_probe_mask & (1 << dev->devno))) { | |
2001 | ata_eh_detach_dev(dev); | |
2002 | ata_dev_init(dev); | |
2003 | ||
2004 | ehc->tries[dev->devno] = ATA_EH_DEV_TRIES; | |
2005 | ehc->did_probe_mask |= (1 << dev->devno); | |
2006 | ehc->i.action |= ATA_EH_SOFTRESET; | |
2007 | } | |
2008 | } else { | |
2009 | /* soft didn't work? be haaaaard */ | |
2010 | if (ehc->i.flags & ATA_EHI_DID_RESET) | |
2011 | ehc->i.action |= ATA_EH_HARDRESET; | |
2012 | else | |
2013 | ehc->i.action |= ATA_EH_SOFTRESET; | |
2014 | } | |
2015 | } | |
2016 | ||
022bdb07 TH |
2017 | /** |
2018 | * ata_eh_recover - recover host port after error | |
2019 | * @ap: host port to recover | |
f5914a46 | 2020 | * @prereset: prereset method (can be NULL) |
022bdb07 TH |
2021 | * @softreset: softreset method (can be NULL) |
2022 | * @hardreset: hardreset method (can be NULL) | |
2023 | * @postreset: postreset method (can be NULL) | |
2024 | * | |
2025 | * This is the alpha and omega, eum and yang, heart and soul of | |
2026 | * libata exception handling. On entry, actions required to | |
084fe639 TH |
2027 | * recover the port and hotplug requests are recorded in |
2028 | * eh_context. This function executes all the operations with | |
2029 | * appropriate retrials and fallbacks to resurrect failed | |
2030 | * devices, detach goners and greet newcomers. | |
022bdb07 TH |
2031 | * |
2032 | * LOCKING: | |
2033 | * Kernel thread context (may sleep). | |
2034 | * | |
2035 | * RETURNS: | |
2036 | * 0 on success, -errno on failure. | |
2037 | */ | |
f5914a46 TH |
2038 | static int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset, |
2039 | ata_reset_fn_t softreset, ata_reset_fn_t hardreset, | |
022bdb07 TH |
2040 | ata_postreset_fn_t postreset) |
2041 | { | |
2042 | struct ata_eh_context *ehc = &ap->eh_context; | |
2043 | struct ata_device *dev; | |
4ae72a1e | 2044 | int i, rc; |
022bdb07 TH |
2045 | |
2046 | DPRINTK("ENTER\n"); | |
2047 | ||
2048 | /* prep for recovery */ | |
2049 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
2050 | dev = &ap->device[i]; | |
2051 | ||
2052 | ehc->tries[dev->devno] = ATA_EH_DEV_TRIES; | |
084fe639 | 2053 | |
79a55b72 TH |
2054 | /* collect port action mask recorded in dev actions */ |
2055 | ehc->i.action |= ehc->i.dev_action[i] & ~ATA_EH_PERDEV_MASK; | |
2056 | ehc->i.dev_action[i] &= ATA_EH_PERDEV_MASK; | |
2057 | ||
084fe639 TH |
2058 | /* process hotplug request */ |
2059 | if (dev->flags & ATA_DFLAG_DETACH) | |
2060 | ata_eh_detach_dev(dev); | |
2061 | ||
2062 | if (!ata_dev_enabled(dev) && | |
2063 | ((ehc->i.probe_mask & (1 << dev->devno)) && | |
2064 | !(ehc->did_probe_mask & (1 << dev->devno)))) { | |
2065 | ata_eh_detach_dev(dev); | |
2066 | ata_dev_init(dev); | |
2067 | ehc->did_probe_mask |= (1 << dev->devno); | |
2068 | ehc->i.action |= ATA_EH_SOFTRESET; | |
2069 | } | |
022bdb07 TH |
2070 | } |
2071 | ||
2072 | retry: | |
022bdb07 TH |
2073 | rc = 0; |
2074 | ||
aeb2ecd6 | 2075 | /* if UNLOADING, finish immediately */ |
b51e9e5d | 2076 | if (ap->pflags & ATA_PFLAG_UNLOADING) |
aeb2ecd6 TH |
2077 | goto out; |
2078 | ||
022bdb07 | 2079 | /* skip EH if possible. */ |
084fe639 | 2080 | if (ata_eh_skip_recovery(ap)) |
022bdb07 TH |
2081 | ehc->i.action = 0; |
2082 | ||
084fe639 TH |
2083 | for (i = 0; i < ATA_MAX_DEVICES; i++) |
2084 | ehc->classes[i] = ATA_DEV_UNKNOWN; | |
2085 | ||
022bdb07 TH |
2086 | /* reset */ |
2087 | if (ehc->i.action & ATA_EH_RESET_MASK) { | |
2088 | ata_eh_freeze_port(ap); | |
2089 | ||
084fe639 TH |
2090 | rc = ata_eh_reset(ap, ata_port_nr_vacant(ap), prereset, |
2091 | softreset, hardreset, postreset); | |
022bdb07 TH |
2092 | if (rc) { |
2093 | ata_port_printk(ap, KERN_ERR, | |
2094 | "reset failed, giving up\n"); | |
2095 | goto out; | |
2096 | } | |
2097 | ||
2098 | ata_eh_thaw_port(ap); | |
2099 | } | |
2100 | ||
084fe639 TH |
2101 | /* revalidate existing devices and attach new ones */ |
2102 | rc = ata_eh_revalidate_and_attach(ap, &dev); | |
022bdb07 TH |
2103 | if (rc) |
2104 | goto dev_fail; | |
2105 | ||
baa1e78a TH |
2106 | /* configure transfer mode if necessary */ |
2107 | if (ehc->i.flags & ATA_EHI_SETMODE) { | |
022bdb07 | 2108 | rc = ata_set_mode(ap, &dev); |
4ae72a1e | 2109 | if (rc) |
022bdb07 | 2110 | goto dev_fail; |
baa1e78a | 2111 | ehc->i.flags &= ~ATA_EHI_SETMODE; |
022bdb07 TH |
2112 | } |
2113 | ||
2114 | goto out; | |
2115 | ||
2116 | dev_fail: | |
fee7ca72 | 2117 | ata_eh_handle_dev_fail(dev, rc); |
022bdb07 TH |
2118 | |
2119 | if (ata_port_nr_enabled(ap)) { | |
2120 | ata_port_printk(ap, KERN_WARNING, "failed to recover some " | |
2121 | "devices, retrying in 5 secs\n"); | |
2122 | ssleep(5); | |
2123 | } else { | |
2124 | /* no device left, repeat fast */ | |
2125 | msleep(500); | |
2126 | } | |
2127 | ||
2128 | goto retry; | |
2129 | ||
2130 | out: | |
2131 | if (rc) { | |
2132 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
2133 | ata_dev_disable(&ap->device[i]); | |
2134 | } | |
2135 | ||
2136 | DPRINTK("EXIT, rc=%d\n", rc); | |
2137 | return rc; | |
2138 | } | |
2139 | ||
2140 | /** | |
2141 | * ata_eh_finish - finish up EH | |
2142 | * @ap: host port to finish EH for | |
2143 | * | |
2144 | * Recovery is complete. Clean up EH states and retry or finish | |
2145 | * failed qcs. | |
2146 | * | |
2147 | * LOCKING: | |
2148 | * None. | |
2149 | */ | |
2150 | static void ata_eh_finish(struct ata_port *ap) | |
2151 | { | |
2152 | int tag; | |
2153 | ||
2154 | /* retry or finish qcs */ | |
2155 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
2156 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
2157 | ||
2158 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
2159 | continue; | |
2160 | ||
2161 | if (qc->err_mask) { | |
2162 | /* FIXME: Once EH migration is complete, | |
2163 | * generate sense data in this function, | |
2164 | * considering both err_mask and tf. | |
2165 | */ | |
2166 | if (qc->err_mask & AC_ERR_INVALID) | |
2167 | ata_eh_qc_complete(qc); | |
2168 | else | |
2169 | ata_eh_qc_retry(qc); | |
2170 | } else { | |
2171 | if (qc->flags & ATA_QCFLAG_SENSE_VALID) { | |
2172 | ata_eh_qc_complete(qc); | |
2173 | } else { | |
2174 | /* feed zero TF to sense generation */ | |
2175 | memset(&qc->result_tf, 0, sizeof(qc->result_tf)); | |
2176 | ata_eh_qc_retry(qc); | |
2177 | } | |
2178 | } | |
2179 | } | |
2180 | } | |
2181 | ||
2182 | /** | |
2183 | * ata_do_eh - do standard error handling | |
2184 | * @ap: host port to handle error for | |
f5914a46 | 2185 | * @prereset: prereset method (can be NULL) |
022bdb07 TH |
2186 | * @softreset: softreset method (can be NULL) |
2187 | * @hardreset: hardreset method (can be NULL) | |
2188 | * @postreset: postreset method (can be NULL) | |
2189 | * | |
2190 | * Perform standard error handling sequence. | |
2191 | * | |
2192 | * LOCKING: | |
2193 | * Kernel thread context (may sleep). | |
2194 | */ | |
f5914a46 TH |
2195 | void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset, |
2196 | ata_reset_fn_t softreset, ata_reset_fn_t hardreset, | |
2197 | ata_postreset_fn_t postreset) | |
022bdb07 | 2198 | { |
1cdaf534 TH |
2199 | ata_eh_autopsy(ap); |
2200 | ata_eh_report(ap); | |
f5914a46 | 2201 | ata_eh_recover(ap, prereset, softreset, hardreset, postreset); |
022bdb07 TH |
2202 | ata_eh_finish(ap); |
2203 | } | |
500530f6 | 2204 | |
6ffa01d8 | 2205 | #ifdef CONFIG_PM |
500530f6 TH |
2206 | /** |
2207 | * ata_eh_handle_port_suspend - perform port suspend operation | |
2208 | * @ap: port to suspend | |
2209 | * | |
2210 | * Suspend @ap. | |
2211 | * | |
2212 | * LOCKING: | |
2213 | * Kernel thread context (may sleep). | |
2214 | */ | |
2215 | static void ata_eh_handle_port_suspend(struct ata_port *ap) | |
2216 | { | |
2217 | unsigned long flags; | |
2218 | int rc = 0; | |
2219 | ||
2220 | /* are we suspending? */ | |
2221 | spin_lock_irqsave(ap->lock, flags); | |
2222 | if (!(ap->pflags & ATA_PFLAG_PM_PENDING) || | |
2223 | ap->pm_mesg.event == PM_EVENT_ON) { | |
2224 | spin_unlock_irqrestore(ap->lock, flags); | |
2225 | return; | |
2226 | } | |
2227 | spin_unlock_irqrestore(ap->lock, flags); | |
2228 | ||
2229 | WARN_ON(ap->pflags & ATA_PFLAG_SUSPENDED); | |
2230 | ||
64578a3d TH |
2231 | /* tell ACPI we're suspending */ |
2232 | rc = ata_acpi_on_suspend(ap); | |
2233 | if (rc) | |
2234 | goto out; | |
2235 | ||
500530f6 TH |
2236 | /* suspend */ |
2237 | ata_eh_freeze_port(ap); | |
2238 | ||
2239 | if (ap->ops->port_suspend) | |
2240 | rc = ap->ops->port_suspend(ap, ap->pm_mesg); | |
2241 | ||
64578a3d | 2242 | out: |
500530f6 TH |
2243 | /* report result */ |
2244 | spin_lock_irqsave(ap->lock, flags); | |
2245 | ||
2246 | ap->pflags &= ~ATA_PFLAG_PM_PENDING; | |
2247 | if (rc == 0) | |
2248 | ap->pflags |= ATA_PFLAG_SUSPENDED; | |
64578a3d | 2249 | else if (ap->pflags & ATA_PFLAG_FROZEN) |
500530f6 TH |
2250 | ata_port_schedule_eh(ap); |
2251 | ||
2252 | if (ap->pm_result) { | |
2253 | *ap->pm_result = rc; | |
2254 | ap->pm_result = NULL; | |
2255 | } | |
2256 | ||
2257 | spin_unlock_irqrestore(ap->lock, flags); | |
2258 | ||
2259 | return; | |
2260 | } | |
2261 | ||
2262 | /** | |
2263 | * ata_eh_handle_port_resume - perform port resume operation | |
2264 | * @ap: port to resume | |
2265 | * | |
2266 | * Resume @ap. | |
2267 | * | |
500530f6 TH |
2268 | * LOCKING: |
2269 | * Kernel thread context (may sleep). | |
2270 | */ | |
2271 | static void ata_eh_handle_port_resume(struct ata_port *ap) | |
2272 | { | |
500530f6 | 2273 | unsigned long flags; |
9666f400 | 2274 | int rc = 0; |
500530f6 TH |
2275 | |
2276 | /* are we resuming? */ | |
2277 | spin_lock_irqsave(ap->lock, flags); | |
2278 | if (!(ap->pflags & ATA_PFLAG_PM_PENDING) || | |
2279 | ap->pm_mesg.event != PM_EVENT_ON) { | |
2280 | spin_unlock_irqrestore(ap->lock, flags); | |
2281 | return; | |
2282 | } | |
2283 | spin_unlock_irqrestore(ap->lock, flags); | |
2284 | ||
9666f400 | 2285 | WARN_ON(!(ap->pflags & ATA_PFLAG_SUSPENDED)); |
500530f6 TH |
2286 | |
2287 | if (ap->ops->port_resume) | |
2288 | rc = ap->ops->port_resume(ap); | |
2289 | ||
6746544c TH |
2290 | /* tell ACPI that we're resuming */ |
2291 | ata_acpi_on_resume(ap); | |
2292 | ||
9666f400 | 2293 | /* report result */ |
500530f6 TH |
2294 | spin_lock_irqsave(ap->lock, flags); |
2295 | ap->pflags &= ~(ATA_PFLAG_PM_PENDING | ATA_PFLAG_SUSPENDED); | |
2296 | if (ap->pm_result) { | |
2297 | *ap->pm_result = rc; | |
2298 | ap->pm_result = NULL; | |
2299 | } | |
2300 | spin_unlock_irqrestore(ap->lock, flags); | |
2301 | } | |
6ffa01d8 | 2302 | #endif /* CONFIG_PM */ |