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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, | |
5ddf24c5 | 59 | ATA_EH_FASTDRAIN_INTERVAL = 3 * HZ, |
31daabda TH |
60 | }; |
61 | ||
62 | /* The following table determines how we sequence resets. Each entry | |
63 | * represents timeout for that try. The first try can be soft or | |
64 | * hardreset. All others are hardreset if available. In most cases | |
65 | * the first reset w/ 10sec timeout should succeed. Following entries | |
66 | * are mostly for error handling, hotplug and retarded devices. | |
67 | */ | |
68 | static const unsigned long ata_eh_reset_timeouts[] = { | |
69 | 10 * HZ, /* most drives spin up by 10sec */ | |
70 | 10 * HZ, /* > 99% working drives spin up before 20sec */ | |
71 | 35 * HZ, /* give > 30 secs of idleness for retarded devices */ | |
72 | 5 * HZ, /* and sweet one last chance */ | |
73 | /* > 1 min has elapsed, give up */ | |
74 | }; | |
75 | ||
ad9e2762 | 76 | static void __ata_port_freeze(struct ata_port *ap); |
720ba126 | 77 | static void ata_eh_finish(struct ata_port *ap); |
6ffa01d8 | 78 | #ifdef CONFIG_PM |
500530f6 TH |
79 | static void ata_eh_handle_port_suspend(struct ata_port *ap); |
80 | static void ata_eh_handle_port_resume(struct ata_port *ap); | |
6ffa01d8 TH |
81 | #else /* CONFIG_PM */ |
82 | static void ata_eh_handle_port_suspend(struct ata_port *ap) | |
83 | { } | |
84 | ||
85 | static void ata_eh_handle_port_resume(struct ata_port *ap) | |
86 | { } | |
6ffa01d8 | 87 | #endif /* CONFIG_PM */ |
ad9e2762 | 88 | |
b64bbc39 TH |
89 | static void __ata_ehi_pushv_desc(struct ata_eh_info *ehi, const char *fmt, |
90 | va_list args) | |
91 | { | |
92 | ehi->desc_len += vscnprintf(ehi->desc + ehi->desc_len, | |
93 | ATA_EH_DESC_LEN - ehi->desc_len, | |
94 | fmt, args); | |
95 | } | |
96 | ||
97 | /** | |
98 | * __ata_ehi_push_desc - push error description without adding separator | |
99 | * @ehi: target EHI | |
100 | * @fmt: printf format string | |
101 | * | |
102 | * Format string according to @fmt and append it to @ehi->desc. | |
103 | * | |
104 | * LOCKING: | |
105 | * spin_lock_irqsave(host lock) | |
106 | */ | |
107 | void __ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...) | |
108 | { | |
109 | va_list args; | |
110 | ||
111 | va_start(args, fmt); | |
112 | __ata_ehi_pushv_desc(ehi, fmt, args); | |
113 | va_end(args); | |
114 | } | |
115 | ||
116 | /** | |
117 | * ata_ehi_push_desc - push error description with separator | |
118 | * @ehi: target EHI | |
119 | * @fmt: printf format string | |
120 | * | |
121 | * Format string according to @fmt and append it to @ehi->desc. | |
122 | * If @ehi->desc is not empty, ", " is added in-between. | |
123 | * | |
124 | * LOCKING: | |
125 | * spin_lock_irqsave(host lock) | |
126 | */ | |
127 | void ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...) | |
128 | { | |
129 | va_list args; | |
130 | ||
131 | if (ehi->desc_len) | |
132 | __ata_ehi_push_desc(ehi, ", "); | |
133 | ||
134 | va_start(args, fmt); | |
135 | __ata_ehi_pushv_desc(ehi, fmt, args); | |
136 | va_end(args); | |
137 | } | |
138 | ||
139 | /** | |
140 | * ata_ehi_clear_desc - clean error description | |
141 | * @ehi: target EHI | |
142 | * | |
143 | * Clear @ehi->desc. | |
144 | * | |
145 | * LOCKING: | |
146 | * spin_lock_irqsave(host lock) | |
147 | */ | |
148 | void ata_ehi_clear_desc(struct ata_eh_info *ehi) | |
149 | { | |
150 | ehi->desc[0] = '\0'; | |
151 | ehi->desc_len = 0; | |
152 | } | |
153 | ||
0c247c55 TH |
154 | static void ata_ering_record(struct ata_ering *ering, int is_io, |
155 | unsigned int err_mask) | |
156 | { | |
157 | struct ata_ering_entry *ent; | |
158 | ||
159 | WARN_ON(!err_mask); | |
160 | ||
161 | ering->cursor++; | |
162 | ering->cursor %= ATA_ERING_SIZE; | |
163 | ||
164 | ent = &ering->ring[ering->cursor]; | |
165 | ent->is_io = is_io; | |
166 | ent->err_mask = err_mask; | |
167 | ent->timestamp = get_jiffies_64(); | |
168 | } | |
169 | ||
7d47e8d4 | 170 | static void ata_ering_clear(struct ata_ering *ering) |
0c247c55 | 171 | { |
7d47e8d4 | 172 | memset(ering, 0, sizeof(*ering)); |
0c247c55 TH |
173 | } |
174 | ||
175 | static int ata_ering_map(struct ata_ering *ering, | |
176 | int (*map_fn)(struct ata_ering_entry *, void *), | |
177 | void *arg) | |
178 | { | |
179 | int idx, rc = 0; | |
180 | struct ata_ering_entry *ent; | |
181 | ||
182 | idx = ering->cursor; | |
183 | do { | |
184 | ent = &ering->ring[idx]; | |
185 | if (!ent->err_mask) | |
186 | break; | |
187 | rc = map_fn(ent, arg); | |
188 | if (rc) | |
189 | break; | |
190 | idx = (idx - 1 + ATA_ERING_SIZE) % ATA_ERING_SIZE; | |
191 | } while (idx != ering->cursor); | |
192 | ||
193 | return rc; | |
194 | } | |
195 | ||
64f65ca6 TH |
196 | static unsigned int ata_eh_dev_action(struct ata_device *dev) |
197 | { | |
198 | struct ata_eh_context *ehc = &dev->ap->eh_context; | |
199 | ||
200 | return ehc->i.action | ehc->i.dev_action[dev->devno]; | |
201 | } | |
202 | ||
af181c2d TH |
203 | static void ata_eh_clear_action(struct ata_device *dev, |
204 | struct ata_eh_info *ehi, unsigned int action) | |
205 | { | |
206 | int i; | |
207 | ||
208 | if (!dev) { | |
209 | ehi->action &= ~action; | |
210 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
211 | ehi->dev_action[i] &= ~action; | |
212 | } else { | |
213 | /* doesn't make sense for port-wide EH actions */ | |
214 | WARN_ON(!(action & ATA_EH_PERDEV_MASK)); | |
215 | ||
216 | /* break ehi->action into ehi->dev_action */ | |
217 | if (ehi->action & action) { | |
218 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
219 | ehi->dev_action[i] |= ehi->action & action; | |
220 | ehi->action &= ~action; | |
221 | } | |
222 | ||
223 | /* turn off the specified per-dev action */ | |
224 | ehi->dev_action[dev->devno] &= ~action; | |
225 | } | |
226 | } | |
227 | ||
ece1d636 TH |
228 | /** |
229 | * ata_scsi_timed_out - SCSI layer time out callback | |
230 | * @cmd: timed out SCSI command | |
231 | * | |
232 | * Handles SCSI layer timeout. We race with normal completion of | |
233 | * the qc for @cmd. If the qc is already gone, we lose and let | |
234 | * the scsi command finish (EH_HANDLED). Otherwise, the qc has | |
235 | * timed out and EH should be invoked. Prevent ata_qc_complete() | |
236 | * from finishing it by setting EH_SCHEDULED and return | |
237 | * EH_NOT_HANDLED. | |
238 | * | |
ad9e2762 TH |
239 | * TODO: kill this function once old EH is gone. |
240 | * | |
ece1d636 TH |
241 | * LOCKING: |
242 | * Called from timer context | |
243 | * | |
244 | * RETURNS: | |
245 | * EH_HANDLED or EH_NOT_HANDLED | |
246 | */ | |
247 | enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd) | |
248 | { | |
249 | struct Scsi_Host *host = cmd->device->host; | |
35bb94b1 | 250 | struct ata_port *ap = ata_shost_to_port(host); |
ece1d636 TH |
251 | unsigned long flags; |
252 | struct ata_queued_cmd *qc; | |
ad9e2762 | 253 | enum scsi_eh_timer_return ret; |
ece1d636 TH |
254 | |
255 | DPRINTK("ENTER\n"); | |
256 | ||
ad9e2762 TH |
257 | if (ap->ops->error_handler) { |
258 | ret = EH_NOT_HANDLED; | |
259 | goto out; | |
260 | } | |
261 | ||
262 | ret = EH_HANDLED; | |
ba6a1308 | 263 | spin_lock_irqsave(ap->lock, flags); |
ece1d636 TH |
264 | qc = ata_qc_from_tag(ap, ap->active_tag); |
265 | if (qc) { | |
266 | WARN_ON(qc->scsicmd != cmd); | |
267 | qc->flags |= ATA_QCFLAG_EH_SCHEDULED; | |
268 | qc->err_mask |= AC_ERR_TIMEOUT; | |
269 | ret = EH_NOT_HANDLED; | |
270 | } | |
ba6a1308 | 271 | spin_unlock_irqrestore(ap->lock, flags); |
ece1d636 | 272 | |
ad9e2762 | 273 | out: |
ece1d636 TH |
274 | DPRINTK("EXIT, ret=%d\n", ret); |
275 | return ret; | |
276 | } | |
277 | ||
278 | /** | |
279 | * ata_scsi_error - SCSI layer error handler callback | |
280 | * @host: SCSI host on which error occurred | |
281 | * | |
282 | * Handles SCSI-layer-thrown error events. | |
283 | * | |
284 | * LOCKING: | |
285 | * Inherited from SCSI layer (none, can sleep) | |
286 | * | |
287 | * RETURNS: | |
288 | * Zero. | |
289 | */ | |
381544bb | 290 | void ata_scsi_error(struct Scsi_Host *host) |
ece1d636 | 291 | { |
35bb94b1 | 292 | struct ata_port *ap = ata_shost_to_port(host); |
ad9e2762 TH |
293 | int i, repeat_cnt = ATA_EH_MAX_REPEAT; |
294 | unsigned long flags; | |
ece1d636 TH |
295 | |
296 | DPRINTK("ENTER\n"); | |
297 | ||
ad9e2762 | 298 | /* synchronize with port task */ |
ece1d636 TH |
299 | ata_port_flush_task(ap); |
300 | ||
cca3974e | 301 | /* synchronize with host lock and sort out timeouts */ |
ad9e2762 TH |
302 | |
303 | /* For new EH, all qcs are finished in one of three ways - | |
304 | * normal completion, error completion, and SCSI timeout. | |
305 | * Both cmpletions can race against SCSI timeout. When normal | |
306 | * completion wins, the qc never reaches EH. When error | |
307 | * completion wins, the qc has ATA_QCFLAG_FAILED set. | |
308 | * | |
309 | * When SCSI timeout wins, things are a bit more complex. | |
310 | * Normal or error completion can occur after the timeout but | |
311 | * before this point. In such cases, both types of | |
312 | * completions are honored. A scmd is determined to have | |
313 | * timed out iff its associated qc is active and not failed. | |
314 | */ | |
315 | if (ap->ops->error_handler) { | |
316 | struct scsi_cmnd *scmd, *tmp; | |
317 | int nr_timedout = 0; | |
318 | ||
e30349d2 | 319 | spin_lock_irqsave(ap->lock, flags); |
ad9e2762 TH |
320 | |
321 | list_for_each_entry_safe(scmd, tmp, &host->eh_cmd_q, eh_entry) { | |
322 | struct ata_queued_cmd *qc; | |
323 | ||
324 | for (i = 0; i < ATA_MAX_QUEUE; i++) { | |
325 | qc = __ata_qc_from_tag(ap, i); | |
326 | if (qc->flags & ATA_QCFLAG_ACTIVE && | |
327 | qc->scsicmd == scmd) | |
328 | break; | |
329 | } | |
330 | ||
331 | if (i < ATA_MAX_QUEUE) { | |
332 | /* the scmd has an associated qc */ | |
333 | if (!(qc->flags & ATA_QCFLAG_FAILED)) { | |
334 | /* which hasn't failed yet, timeout */ | |
335 | qc->err_mask |= AC_ERR_TIMEOUT; | |
336 | qc->flags |= ATA_QCFLAG_FAILED; | |
337 | nr_timedout++; | |
338 | } | |
339 | } else { | |
340 | /* Normal completion occurred after | |
341 | * SCSI timeout but before this point. | |
342 | * Successfully complete it. | |
343 | */ | |
344 | scmd->retries = scmd->allowed; | |
345 | scsi_eh_finish_cmd(scmd, &ap->eh_done_q); | |
346 | } | |
347 | } | |
348 | ||
349 | /* If we have timed out qcs. They belong to EH from | |
350 | * this point but the state of the controller is | |
351 | * unknown. Freeze the port to make sure the IRQ | |
352 | * handler doesn't diddle with those qcs. This must | |
353 | * be done atomically w.r.t. setting QCFLAG_FAILED. | |
354 | */ | |
355 | if (nr_timedout) | |
356 | __ata_port_freeze(ap); | |
357 | ||
e30349d2 | 358 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 | 359 | } else |
e30349d2 | 360 | spin_unlock_wait(ap->lock); |
ad9e2762 TH |
361 | |
362 | repeat: | |
363 | /* invoke error handler */ | |
364 | if (ap->ops->error_handler) { | |
5ddf24c5 TH |
365 | /* kill fast drain timer */ |
366 | del_timer_sync(&ap->fastdrain_timer); | |
367 | ||
500530f6 TH |
368 | /* process port resume request */ |
369 | ata_eh_handle_port_resume(ap); | |
370 | ||
f3e81b19 | 371 | /* fetch & clear EH info */ |
e30349d2 | 372 | spin_lock_irqsave(ap->lock, flags); |
f3e81b19 TH |
373 | |
374 | memset(&ap->eh_context, 0, sizeof(ap->eh_context)); | |
375 | ap->eh_context.i = ap->eh_info; | |
376 | memset(&ap->eh_info, 0, sizeof(ap->eh_info)); | |
377 | ||
b51e9e5d TH |
378 | ap->pflags |= ATA_PFLAG_EH_IN_PROGRESS; |
379 | ap->pflags &= ~ATA_PFLAG_EH_PENDING; | |
f3e81b19 | 380 | |
e30349d2 | 381 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 | 382 | |
500530f6 TH |
383 | /* invoke EH, skip if unloading or suspended */ |
384 | if (!(ap->pflags & (ATA_PFLAG_UNLOADING | ATA_PFLAG_SUSPENDED))) | |
720ba126 TH |
385 | ap->ops->error_handler(ap); |
386 | else | |
387 | ata_eh_finish(ap); | |
ad9e2762 | 388 | |
500530f6 TH |
389 | /* process port suspend request */ |
390 | ata_eh_handle_port_suspend(ap); | |
391 | ||
ad9e2762 TH |
392 | /* Exception might have happend after ->error_handler |
393 | * recovered the port but before this point. Repeat | |
394 | * EH in such case. | |
395 | */ | |
e30349d2 | 396 | spin_lock_irqsave(ap->lock, flags); |
ad9e2762 | 397 | |
b51e9e5d | 398 | if (ap->pflags & ATA_PFLAG_EH_PENDING) { |
ad9e2762 TH |
399 | if (--repeat_cnt) { |
400 | ata_port_printk(ap, KERN_INFO, | |
401 | "EH pending after completion, " | |
402 | "repeating EH (cnt=%d)\n", repeat_cnt); | |
e30349d2 | 403 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 TH |
404 | goto repeat; |
405 | } | |
406 | ata_port_printk(ap, KERN_ERR, "EH pending after %d " | |
407 | "tries, giving up\n", ATA_EH_MAX_REPEAT); | |
914616a3 | 408 | ap->pflags &= ~ATA_PFLAG_EH_PENDING; |
ad9e2762 TH |
409 | } |
410 | ||
f3e81b19 TH |
411 | /* this run is complete, make sure EH info is clear */ |
412 | memset(&ap->eh_info, 0, sizeof(ap->eh_info)); | |
413 | ||
e30349d2 | 414 | /* Clear host_eh_scheduled while holding ap->lock such |
ad9e2762 TH |
415 | * that if exception occurs after this point but |
416 | * before EH completion, SCSI midlayer will | |
417 | * re-initiate EH. | |
418 | */ | |
419 | host->host_eh_scheduled = 0; | |
420 | ||
e30349d2 | 421 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 TH |
422 | } else { |
423 | WARN_ON(ata_qc_from_tag(ap, ap->active_tag) == NULL); | |
424 | ap->ops->eng_timeout(ap); | |
425 | } | |
ece1d636 | 426 | |
ad9e2762 | 427 | /* finish or retry handled scmd's and clean up */ |
ece1d636 TH |
428 | WARN_ON(host->host_failed || !list_empty(&host->eh_cmd_q)); |
429 | ||
430 | scsi_eh_flush_done_q(&ap->eh_done_q); | |
431 | ||
ad9e2762 | 432 | /* clean up */ |
e30349d2 | 433 | spin_lock_irqsave(ap->lock, flags); |
ad9e2762 | 434 | |
1cdaf534 | 435 | if (ap->pflags & ATA_PFLAG_LOADING) |
b51e9e5d | 436 | ap->pflags &= ~ATA_PFLAG_LOADING; |
1cdaf534 | 437 | else if (ap->pflags & ATA_PFLAG_SCSI_HOTPLUG) |
52bad64d | 438 | queue_delayed_work(ata_aux_wq, &ap->hotplug_task, 0); |
1cdaf534 TH |
439 | |
440 | if (ap->pflags & ATA_PFLAG_RECOVERED) | |
441 | ata_port_printk(ap, KERN_INFO, "EH complete\n"); | |
580b2102 | 442 | |
b51e9e5d | 443 | ap->pflags &= ~(ATA_PFLAG_SCSI_HOTPLUG | ATA_PFLAG_RECOVERED); |
ad9e2762 | 444 | |
c6cf9e99 | 445 | /* tell wait_eh that we're done */ |
b51e9e5d | 446 | ap->pflags &= ~ATA_PFLAG_EH_IN_PROGRESS; |
c6cf9e99 TH |
447 | wake_up_all(&ap->eh_wait_q); |
448 | ||
e30349d2 | 449 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 | 450 | |
ece1d636 | 451 | DPRINTK("EXIT\n"); |
ece1d636 TH |
452 | } |
453 | ||
c6cf9e99 TH |
454 | /** |
455 | * ata_port_wait_eh - Wait for the currently pending EH to complete | |
456 | * @ap: Port to wait EH for | |
457 | * | |
458 | * Wait until the currently pending EH is complete. | |
459 | * | |
460 | * LOCKING: | |
461 | * Kernel thread context (may sleep). | |
462 | */ | |
463 | void ata_port_wait_eh(struct ata_port *ap) | |
464 | { | |
465 | unsigned long flags; | |
466 | DEFINE_WAIT(wait); | |
467 | ||
468 | retry: | |
ba6a1308 | 469 | spin_lock_irqsave(ap->lock, flags); |
c6cf9e99 | 470 | |
b51e9e5d | 471 | while (ap->pflags & (ATA_PFLAG_EH_PENDING | ATA_PFLAG_EH_IN_PROGRESS)) { |
c6cf9e99 | 472 | prepare_to_wait(&ap->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE); |
ba6a1308 | 473 | spin_unlock_irqrestore(ap->lock, flags); |
c6cf9e99 | 474 | schedule(); |
ba6a1308 | 475 | spin_lock_irqsave(ap->lock, flags); |
c6cf9e99 | 476 | } |
0a1b622e | 477 | finish_wait(&ap->eh_wait_q, &wait); |
c6cf9e99 | 478 | |
ba6a1308 | 479 | spin_unlock_irqrestore(ap->lock, flags); |
c6cf9e99 TH |
480 | |
481 | /* make sure SCSI EH is complete */ | |
cca3974e | 482 | if (scsi_host_in_recovery(ap->scsi_host)) { |
c6cf9e99 TH |
483 | msleep(10); |
484 | goto retry; | |
485 | } | |
486 | } | |
487 | ||
ece1d636 TH |
488 | /** |
489 | * ata_qc_timeout - Handle timeout of queued command | |
490 | * @qc: Command that timed out | |
491 | * | |
492 | * Some part of the kernel (currently, only the SCSI layer) | |
493 | * has noticed that the active command on port @ap has not | |
494 | * completed after a specified length of time. Handle this | |
495 | * condition by disabling DMA (if necessary) and completing | |
496 | * transactions, with error if necessary. | |
497 | * | |
498 | * This also handles the case of the "lost interrupt", where | |
499 | * for some reason (possibly hardware bug, possibly driver bug) | |
500 | * an interrupt was not delivered to the driver, even though the | |
501 | * transaction completed successfully. | |
502 | * | |
ad9e2762 TH |
503 | * TODO: kill this function once old EH is gone. |
504 | * | |
ece1d636 TH |
505 | * LOCKING: |
506 | * Inherited from SCSI layer (none, can sleep) | |
507 | */ | |
508 | static void ata_qc_timeout(struct ata_queued_cmd *qc) | |
509 | { | |
510 | struct ata_port *ap = qc->ap; | |
ece1d636 TH |
511 | u8 host_stat = 0, drv_stat; |
512 | unsigned long flags; | |
513 | ||
514 | DPRINTK("ENTER\n"); | |
515 | ||
516 | ap->hsm_task_state = HSM_ST_IDLE; | |
517 | ||
ba6a1308 | 518 | spin_lock_irqsave(ap->lock, flags); |
ece1d636 TH |
519 | |
520 | switch (qc->tf.protocol) { | |
521 | ||
522 | case ATA_PROT_DMA: | |
523 | case ATA_PROT_ATAPI_DMA: | |
524 | host_stat = ap->ops->bmdma_status(ap); | |
525 | ||
526 | /* before we do anything else, clear DMA-Start bit */ | |
527 | ap->ops->bmdma_stop(qc); | |
528 | ||
529 | /* fall through */ | |
530 | ||
531 | default: | |
532 | ata_altstatus(ap); | |
533 | drv_stat = ata_chk_status(ap); | |
534 | ||
535 | /* ack bmdma irq events */ | |
536 | ap->ops->irq_clear(ap); | |
537 | ||
f15a1daf TH |
538 | ata_dev_printk(qc->dev, KERN_ERR, "command 0x%x timeout, " |
539 | "stat 0x%x host_stat 0x%x\n", | |
540 | qc->tf.command, drv_stat, host_stat); | |
ece1d636 TH |
541 | |
542 | /* complete taskfile transaction */ | |
c13b56a1 | 543 | qc->err_mask |= AC_ERR_TIMEOUT; |
ece1d636 TH |
544 | break; |
545 | } | |
546 | ||
ba6a1308 | 547 | spin_unlock_irqrestore(ap->lock, flags); |
ece1d636 TH |
548 | |
549 | ata_eh_qc_complete(qc); | |
550 | ||
551 | DPRINTK("EXIT\n"); | |
552 | } | |
553 | ||
554 | /** | |
555 | * ata_eng_timeout - Handle timeout of queued command | |
556 | * @ap: Port on which timed-out command is active | |
557 | * | |
558 | * Some part of the kernel (currently, only the SCSI layer) | |
559 | * has noticed that the active command on port @ap has not | |
560 | * completed after a specified length of time. Handle this | |
561 | * condition by disabling DMA (if necessary) and completing | |
562 | * transactions, with error if necessary. | |
563 | * | |
564 | * This also handles the case of the "lost interrupt", where | |
565 | * for some reason (possibly hardware bug, possibly driver bug) | |
566 | * an interrupt was not delivered to the driver, even though the | |
567 | * transaction completed successfully. | |
568 | * | |
ad9e2762 TH |
569 | * TODO: kill this function once old EH is gone. |
570 | * | |
ece1d636 TH |
571 | * LOCKING: |
572 | * Inherited from SCSI layer (none, can sleep) | |
573 | */ | |
574 | void ata_eng_timeout(struct ata_port *ap) | |
575 | { | |
576 | DPRINTK("ENTER\n"); | |
577 | ||
578 | ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag)); | |
579 | ||
580 | DPRINTK("EXIT\n"); | |
581 | } | |
582 | ||
5ddf24c5 TH |
583 | static int ata_eh_nr_in_flight(struct ata_port *ap) |
584 | { | |
585 | unsigned int tag; | |
586 | int nr = 0; | |
587 | ||
588 | /* count only non-internal commands */ | |
589 | for (tag = 0; tag < ATA_MAX_QUEUE - 1; tag++) | |
590 | if (ata_qc_from_tag(ap, tag)) | |
591 | nr++; | |
592 | ||
593 | return nr; | |
594 | } | |
595 | ||
596 | void ata_eh_fastdrain_timerfn(unsigned long arg) | |
597 | { | |
598 | struct ata_port *ap = (void *)arg; | |
599 | unsigned long flags; | |
600 | int cnt; | |
601 | ||
602 | spin_lock_irqsave(ap->lock, flags); | |
603 | ||
604 | cnt = ata_eh_nr_in_flight(ap); | |
605 | ||
606 | /* are we done? */ | |
607 | if (!cnt) | |
608 | goto out_unlock; | |
609 | ||
610 | if (cnt == ap->fastdrain_cnt) { | |
611 | unsigned int tag; | |
612 | ||
613 | /* No progress during the last interval, tag all | |
614 | * in-flight qcs as timed out and freeze the port. | |
615 | */ | |
616 | for (tag = 0; tag < ATA_MAX_QUEUE - 1; tag++) { | |
617 | struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag); | |
618 | if (qc) | |
619 | qc->err_mask |= AC_ERR_TIMEOUT; | |
620 | } | |
621 | ||
622 | ata_port_freeze(ap); | |
623 | } else { | |
624 | /* some qcs have finished, give it another chance */ | |
625 | ap->fastdrain_cnt = cnt; | |
626 | ap->fastdrain_timer.expires = | |
627 | jiffies + ATA_EH_FASTDRAIN_INTERVAL; | |
628 | add_timer(&ap->fastdrain_timer); | |
629 | } | |
630 | ||
631 | out_unlock: | |
632 | spin_unlock_irqrestore(ap->lock, flags); | |
633 | } | |
634 | ||
635 | /** | |
636 | * ata_eh_set_pending - set ATA_PFLAG_EH_PENDING and activate fast drain | |
637 | * @ap: target ATA port | |
638 | * @fastdrain: activate fast drain | |
639 | * | |
640 | * Set ATA_PFLAG_EH_PENDING and activate fast drain if @fastdrain | |
641 | * is non-zero and EH wasn't pending before. Fast drain ensures | |
642 | * that EH kicks in in timely manner. | |
643 | * | |
644 | * LOCKING: | |
645 | * spin_lock_irqsave(host lock) | |
646 | */ | |
647 | static void ata_eh_set_pending(struct ata_port *ap, int fastdrain) | |
648 | { | |
649 | int cnt; | |
650 | ||
651 | /* already scheduled? */ | |
652 | if (ap->pflags & ATA_PFLAG_EH_PENDING) | |
653 | return; | |
654 | ||
655 | ap->pflags |= ATA_PFLAG_EH_PENDING; | |
656 | ||
657 | if (!fastdrain) | |
658 | return; | |
659 | ||
660 | /* do we have in-flight qcs? */ | |
661 | cnt = ata_eh_nr_in_flight(ap); | |
662 | if (!cnt) | |
663 | return; | |
664 | ||
665 | /* activate fast drain */ | |
666 | ap->fastdrain_cnt = cnt; | |
667 | ap->fastdrain_timer.expires = jiffies + ATA_EH_FASTDRAIN_INTERVAL; | |
668 | add_timer(&ap->fastdrain_timer); | |
669 | } | |
670 | ||
f686bcb8 TH |
671 | /** |
672 | * ata_qc_schedule_eh - schedule qc for error handling | |
673 | * @qc: command to schedule error handling for | |
674 | * | |
675 | * Schedule error handling for @qc. EH will kick in as soon as | |
676 | * other commands are drained. | |
677 | * | |
678 | * LOCKING: | |
cca3974e | 679 | * spin_lock_irqsave(host lock) |
f686bcb8 TH |
680 | */ |
681 | void ata_qc_schedule_eh(struct ata_queued_cmd *qc) | |
682 | { | |
683 | struct ata_port *ap = qc->ap; | |
684 | ||
685 | WARN_ON(!ap->ops->error_handler); | |
686 | ||
687 | qc->flags |= ATA_QCFLAG_FAILED; | |
5ddf24c5 | 688 | ata_eh_set_pending(ap, 1); |
f686bcb8 TH |
689 | |
690 | /* The following will fail if timeout has already expired. | |
691 | * ata_scsi_error() takes care of such scmds on EH entry. | |
692 | * Note that ATA_QCFLAG_FAILED is unconditionally set after | |
693 | * this function completes. | |
694 | */ | |
695 | scsi_req_abort_cmd(qc->scsicmd); | |
696 | } | |
697 | ||
7b70fc03 TH |
698 | /** |
699 | * ata_port_schedule_eh - schedule error handling without a qc | |
700 | * @ap: ATA port to schedule EH for | |
701 | * | |
702 | * Schedule error handling for @ap. EH will kick in as soon as | |
703 | * all commands are drained. | |
704 | * | |
705 | * LOCKING: | |
cca3974e | 706 | * spin_lock_irqsave(host lock) |
7b70fc03 TH |
707 | */ |
708 | void ata_port_schedule_eh(struct ata_port *ap) | |
709 | { | |
710 | WARN_ON(!ap->ops->error_handler); | |
711 | ||
f4d6d004 TH |
712 | if (ap->pflags & ATA_PFLAG_INITIALIZING) |
713 | return; | |
714 | ||
5ddf24c5 | 715 | ata_eh_set_pending(ap, 1); |
cca3974e | 716 | scsi_schedule_eh(ap->scsi_host); |
7b70fc03 TH |
717 | |
718 | DPRINTK("port EH scheduled\n"); | |
719 | } | |
720 | ||
721 | /** | |
722 | * ata_port_abort - abort all qc's on the port | |
723 | * @ap: ATA port to abort qc's for | |
724 | * | |
725 | * Abort all active qc's of @ap and schedule EH. | |
726 | * | |
727 | * LOCKING: | |
cca3974e | 728 | * spin_lock_irqsave(host lock) |
7b70fc03 TH |
729 | * |
730 | * RETURNS: | |
731 | * Number of aborted qc's. | |
732 | */ | |
733 | int ata_port_abort(struct ata_port *ap) | |
734 | { | |
735 | int tag, nr_aborted = 0; | |
736 | ||
737 | WARN_ON(!ap->ops->error_handler); | |
738 | ||
5ddf24c5 TH |
739 | /* we're gonna abort all commands, no need for fast drain */ |
740 | ata_eh_set_pending(ap, 0); | |
741 | ||
7b70fc03 TH |
742 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { |
743 | struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag); | |
744 | ||
745 | if (qc) { | |
746 | qc->flags |= ATA_QCFLAG_FAILED; | |
747 | ata_qc_complete(qc); | |
748 | nr_aborted++; | |
749 | } | |
750 | } | |
751 | ||
752 | if (!nr_aborted) | |
753 | ata_port_schedule_eh(ap); | |
754 | ||
755 | return nr_aborted; | |
756 | } | |
757 | ||
e3180499 TH |
758 | /** |
759 | * __ata_port_freeze - freeze port | |
760 | * @ap: ATA port to freeze | |
761 | * | |
762 | * This function is called when HSM violation or some other | |
763 | * condition disrupts normal operation of the port. Frozen port | |
764 | * is not allowed to perform any operation until the port is | |
765 | * thawed, which usually follows a successful reset. | |
766 | * | |
767 | * ap->ops->freeze() callback can be used for freezing the port | |
768 | * hardware-wise (e.g. mask interrupt and stop DMA engine). If a | |
769 | * port cannot be frozen hardware-wise, the interrupt handler | |
770 | * must ack and clear interrupts unconditionally while the port | |
771 | * is frozen. | |
772 | * | |
773 | * LOCKING: | |
cca3974e | 774 | * spin_lock_irqsave(host lock) |
e3180499 TH |
775 | */ |
776 | static void __ata_port_freeze(struct ata_port *ap) | |
777 | { | |
778 | WARN_ON(!ap->ops->error_handler); | |
779 | ||
780 | if (ap->ops->freeze) | |
781 | ap->ops->freeze(ap); | |
782 | ||
b51e9e5d | 783 | ap->pflags |= ATA_PFLAG_FROZEN; |
e3180499 | 784 | |
44877b4e | 785 | DPRINTK("ata%u port frozen\n", ap->print_id); |
e3180499 TH |
786 | } |
787 | ||
788 | /** | |
789 | * ata_port_freeze - abort & freeze port | |
790 | * @ap: ATA port to freeze | |
791 | * | |
792 | * Abort and freeze @ap. | |
793 | * | |
794 | * LOCKING: | |
cca3974e | 795 | * spin_lock_irqsave(host lock) |
e3180499 TH |
796 | * |
797 | * RETURNS: | |
798 | * Number of aborted commands. | |
799 | */ | |
800 | int ata_port_freeze(struct ata_port *ap) | |
801 | { | |
802 | int nr_aborted; | |
803 | ||
804 | WARN_ON(!ap->ops->error_handler); | |
805 | ||
806 | nr_aborted = ata_port_abort(ap); | |
807 | __ata_port_freeze(ap); | |
808 | ||
809 | return nr_aborted; | |
810 | } | |
811 | ||
812 | /** | |
813 | * ata_eh_freeze_port - EH helper to freeze port | |
814 | * @ap: ATA port to freeze | |
815 | * | |
816 | * Freeze @ap. | |
817 | * | |
818 | * LOCKING: | |
819 | * None. | |
820 | */ | |
821 | void ata_eh_freeze_port(struct ata_port *ap) | |
822 | { | |
823 | unsigned long flags; | |
824 | ||
825 | if (!ap->ops->error_handler) | |
826 | return; | |
827 | ||
ba6a1308 | 828 | spin_lock_irqsave(ap->lock, flags); |
e3180499 | 829 | __ata_port_freeze(ap); |
ba6a1308 | 830 | spin_unlock_irqrestore(ap->lock, flags); |
e3180499 TH |
831 | } |
832 | ||
833 | /** | |
834 | * ata_port_thaw_port - EH helper to thaw port | |
835 | * @ap: ATA port to thaw | |
836 | * | |
837 | * Thaw frozen port @ap. | |
838 | * | |
839 | * LOCKING: | |
840 | * None. | |
841 | */ | |
842 | void ata_eh_thaw_port(struct ata_port *ap) | |
843 | { | |
844 | unsigned long flags; | |
845 | ||
846 | if (!ap->ops->error_handler) | |
847 | return; | |
848 | ||
ba6a1308 | 849 | spin_lock_irqsave(ap->lock, flags); |
e3180499 | 850 | |
b51e9e5d | 851 | ap->pflags &= ~ATA_PFLAG_FROZEN; |
e3180499 TH |
852 | |
853 | if (ap->ops->thaw) | |
854 | ap->ops->thaw(ap); | |
855 | ||
ba6a1308 | 856 | spin_unlock_irqrestore(ap->lock, flags); |
e3180499 | 857 | |
44877b4e | 858 | DPRINTK("ata%u port thawed\n", ap->print_id); |
e3180499 TH |
859 | } |
860 | ||
ece1d636 TH |
861 | static void ata_eh_scsidone(struct scsi_cmnd *scmd) |
862 | { | |
863 | /* nada */ | |
864 | } | |
865 | ||
866 | static void __ata_eh_qc_complete(struct ata_queued_cmd *qc) | |
867 | { | |
868 | struct ata_port *ap = qc->ap; | |
869 | struct scsi_cmnd *scmd = qc->scsicmd; | |
870 | unsigned long flags; | |
871 | ||
ba6a1308 | 872 | spin_lock_irqsave(ap->lock, flags); |
ece1d636 TH |
873 | qc->scsidone = ata_eh_scsidone; |
874 | __ata_qc_complete(qc); | |
875 | WARN_ON(ata_tag_valid(qc->tag)); | |
ba6a1308 | 876 | spin_unlock_irqrestore(ap->lock, flags); |
ece1d636 TH |
877 | |
878 | scsi_eh_finish_cmd(scmd, &ap->eh_done_q); | |
879 | } | |
880 | ||
881 | /** | |
882 | * ata_eh_qc_complete - Complete an active ATA command from EH | |
883 | * @qc: Command to complete | |
884 | * | |
885 | * Indicate to the mid and upper layers that an ATA command has | |
886 | * completed. To be used from EH. | |
887 | */ | |
888 | void ata_eh_qc_complete(struct ata_queued_cmd *qc) | |
889 | { | |
890 | struct scsi_cmnd *scmd = qc->scsicmd; | |
891 | scmd->retries = scmd->allowed; | |
892 | __ata_eh_qc_complete(qc); | |
893 | } | |
894 | ||
895 | /** | |
896 | * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH | |
897 | * @qc: Command to retry | |
898 | * | |
899 | * Indicate to the mid and upper layers that an ATA command | |
900 | * should be retried. To be used from EH. | |
901 | * | |
902 | * SCSI midlayer limits the number of retries to scmd->allowed. | |
903 | * scmd->retries is decremented for commands which get retried | |
904 | * due to unrelated failures (qc->err_mask is zero). | |
905 | */ | |
906 | void ata_eh_qc_retry(struct ata_queued_cmd *qc) | |
907 | { | |
908 | struct scsi_cmnd *scmd = qc->scsicmd; | |
909 | if (!qc->err_mask && scmd->retries) | |
910 | scmd->retries--; | |
911 | __ata_eh_qc_complete(qc); | |
912 | } | |
022bdb07 | 913 | |
0ea035a3 TH |
914 | /** |
915 | * ata_eh_detach_dev - detach ATA device | |
916 | * @dev: ATA device to detach | |
917 | * | |
918 | * Detach @dev. | |
919 | * | |
920 | * LOCKING: | |
921 | * None. | |
922 | */ | |
923 | static void ata_eh_detach_dev(struct ata_device *dev) | |
924 | { | |
925 | struct ata_port *ap = dev->ap; | |
926 | unsigned long flags; | |
927 | ||
928 | ata_dev_disable(dev); | |
929 | ||
ba6a1308 | 930 | spin_lock_irqsave(ap->lock, flags); |
0ea035a3 TH |
931 | |
932 | dev->flags &= ~ATA_DFLAG_DETACH; | |
933 | ||
934 | if (ata_scsi_offline_dev(dev)) { | |
935 | dev->flags |= ATA_DFLAG_DETACHED; | |
b51e9e5d | 936 | ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG; |
0ea035a3 TH |
937 | } |
938 | ||
beb07c1a TH |
939 | /* clear per-dev EH actions */ |
940 | ata_eh_clear_action(dev, &ap->eh_info, ATA_EH_PERDEV_MASK); | |
941 | ata_eh_clear_action(dev, &ap->eh_context.i, ATA_EH_PERDEV_MASK); | |
942 | ||
ba6a1308 | 943 | spin_unlock_irqrestore(ap->lock, flags); |
0ea035a3 TH |
944 | } |
945 | ||
022bdb07 TH |
946 | /** |
947 | * ata_eh_about_to_do - about to perform eh_action | |
948 | * @ap: target ATA port | |
47005f25 | 949 | * @dev: target ATA dev for per-dev action (can be NULL) |
022bdb07 TH |
950 | * @action: action about to be performed |
951 | * | |
952 | * Called just before performing EH actions to clear related bits | |
953 | * in @ap->eh_info such that eh actions are not unnecessarily | |
954 | * repeated. | |
955 | * | |
956 | * LOCKING: | |
957 | * None. | |
958 | */ | |
47005f25 TH |
959 | static void ata_eh_about_to_do(struct ata_port *ap, struct ata_device *dev, |
960 | unsigned int action) | |
022bdb07 TH |
961 | { |
962 | unsigned long flags; | |
13abf50d TH |
963 | struct ata_eh_info *ehi = &ap->eh_info; |
964 | struct ata_eh_context *ehc = &ap->eh_context; | |
022bdb07 | 965 | |
ba6a1308 | 966 | spin_lock_irqsave(ap->lock, flags); |
1cdaf534 | 967 | |
13abf50d TH |
968 | /* Reset is represented by combination of actions and EHI |
969 | * flags. Suck in all related bits before clearing eh_info to | |
970 | * avoid losing requested action. | |
971 | */ | |
972 | if (action & ATA_EH_RESET_MASK) { | |
973 | ehc->i.action |= ehi->action & ATA_EH_RESET_MASK; | |
974 | ehc->i.flags |= ehi->flags & ATA_EHI_RESET_MODIFIER_MASK; | |
975 | ||
976 | /* make sure all reset actions are cleared & clear EHI flags */ | |
977 | action |= ATA_EH_RESET_MASK; | |
978 | ehi->flags &= ~ATA_EHI_RESET_MODIFIER_MASK; | |
979 | } | |
980 | ||
981 | ata_eh_clear_action(dev, ehi, action); | |
1cdaf534 | 982 | |
13abf50d | 983 | if (!(ehc->i.flags & ATA_EHI_QUIET)) |
1cdaf534 TH |
984 | ap->pflags |= ATA_PFLAG_RECOVERED; |
985 | ||
ba6a1308 | 986 | spin_unlock_irqrestore(ap->lock, flags); |
022bdb07 TH |
987 | } |
988 | ||
47005f25 TH |
989 | /** |
990 | * ata_eh_done - EH action complete | |
991 | * @ap: target ATA port | |
992 | * @dev: target ATA dev for per-dev action (can be NULL) | |
993 | * @action: action just completed | |
994 | * | |
995 | * Called right after performing EH actions to clear related bits | |
996 | * in @ap->eh_context. | |
997 | * | |
998 | * LOCKING: | |
999 | * None. | |
1000 | */ | |
1001 | static void ata_eh_done(struct ata_port *ap, struct ata_device *dev, | |
1002 | unsigned int action) | |
1003 | { | |
13abf50d TH |
1004 | /* if reset is complete, clear all reset actions & reset modifier */ |
1005 | if (action & ATA_EH_RESET_MASK) { | |
1006 | action |= ATA_EH_RESET_MASK; | |
1007 | ap->eh_context.i.flags &= ~ATA_EHI_RESET_MODIFIER_MASK; | |
1008 | } | |
1009 | ||
47005f25 TH |
1010 | ata_eh_clear_action(dev, &ap->eh_context.i, action); |
1011 | } | |
1012 | ||
022bdb07 TH |
1013 | /** |
1014 | * ata_err_string - convert err_mask to descriptive string | |
1015 | * @err_mask: error mask to convert to string | |
1016 | * | |
1017 | * Convert @err_mask to descriptive string. Errors are | |
1018 | * prioritized according to severity and only the most severe | |
1019 | * error is reported. | |
1020 | * | |
1021 | * LOCKING: | |
1022 | * None. | |
1023 | * | |
1024 | * RETURNS: | |
1025 | * Descriptive string for @err_mask | |
1026 | */ | |
1027 | static const char * ata_err_string(unsigned int err_mask) | |
1028 | { | |
1029 | if (err_mask & AC_ERR_HOST_BUS) | |
1030 | return "host bus error"; | |
1031 | if (err_mask & AC_ERR_ATA_BUS) | |
1032 | return "ATA bus error"; | |
1033 | if (err_mask & AC_ERR_TIMEOUT) | |
1034 | return "timeout"; | |
1035 | if (err_mask & AC_ERR_HSM) | |
1036 | return "HSM violation"; | |
1037 | if (err_mask & AC_ERR_SYSTEM) | |
1038 | return "internal error"; | |
1039 | if (err_mask & AC_ERR_MEDIA) | |
1040 | return "media error"; | |
1041 | if (err_mask & AC_ERR_INVALID) | |
1042 | return "invalid argument"; | |
1043 | if (err_mask & AC_ERR_DEV) | |
1044 | return "device error"; | |
1045 | return "unknown error"; | |
1046 | } | |
1047 | ||
e8ee8451 TH |
1048 | /** |
1049 | * ata_read_log_page - read a specific log page | |
1050 | * @dev: target device | |
1051 | * @page: page to read | |
1052 | * @buf: buffer to store read page | |
1053 | * @sectors: number of sectors to read | |
1054 | * | |
1055 | * Read log page using READ_LOG_EXT command. | |
1056 | * | |
1057 | * LOCKING: | |
1058 | * Kernel thread context (may sleep). | |
1059 | * | |
1060 | * RETURNS: | |
1061 | * 0 on success, AC_ERR_* mask otherwise. | |
1062 | */ | |
1063 | static unsigned int ata_read_log_page(struct ata_device *dev, | |
1064 | u8 page, void *buf, unsigned int sectors) | |
1065 | { | |
1066 | struct ata_taskfile tf; | |
1067 | unsigned int err_mask; | |
1068 | ||
1069 | DPRINTK("read log page - page %d\n", page); | |
1070 | ||
1071 | ata_tf_init(dev, &tf); | |
1072 | tf.command = ATA_CMD_READ_LOG_EXT; | |
1073 | tf.lbal = page; | |
1074 | tf.nsect = sectors; | |
1075 | tf.hob_nsect = sectors >> 8; | |
1076 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_LBA48 | ATA_TFLAG_DEVICE; | |
1077 | tf.protocol = ATA_PROT_PIO; | |
1078 | ||
1079 | err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE, | |
1080 | buf, sectors * ATA_SECT_SIZE); | |
1081 | ||
1082 | DPRINTK("EXIT, err_mask=%x\n", err_mask); | |
1083 | return err_mask; | |
1084 | } | |
1085 | ||
1086 | /** | |
1087 | * ata_eh_read_log_10h - Read log page 10h for NCQ error details | |
1088 | * @dev: Device to read log page 10h from | |
1089 | * @tag: Resulting tag of the failed command | |
1090 | * @tf: Resulting taskfile registers of the failed command | |
1091 | * | |
1092 | * Read log page 10h to obtain NCQ error details and clear error | |
1093 | * condition. | |
1094 | * | |
1095 | * LOCKING: | |
1096 | * Kernel thread context (may sleep). | |
1097 | * | |
1098 | * RETURNS: | |
1099 | * 0 on success, -errno otherwise. | |
1100 | */ | |
1101 | static int ata_eh_read_log_10h(struct ata_device *dev, | |
1102 | int *tag, struct ata_taskfile *tf) | |
1103 | { | |
1104 | u8 *buf = dev->ap->sector_buf; | |
1105 | unsigned int err_mask; | |
1106 | u8 csum; | |
1107 | int i; | |
1108 | ||
1109 | err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, buf, 1); | |
1110 | if (err_mask) | |
1111 | return -EIO; | |
1112 | ||
1113 | csum = 0; | |
1114 | for (i = 0; i < ATA_SECT_SIZE; i++) | |
1115 | csum += buf[i]; | |
1116 | if (csum) | |
1117 | ata_dev_printk(dev, KERN_WARNING, | |
1118 | "invalid checksum 0x%x on log page 10h\n", csum); | |
1119 | ||
1120 | if (buf[0] & 0x80) | |
1121 | return -ENOENT; | |
1122 | ||
1123 | *tag = buf[0] & 0x1f; | |
1124 | ||
1125 | tf->command = buf[2]; | |
1126 | tf->feature = buf[3]; | |
1127 | tf->lbal = buf[4]; | |
1128 | tf->lbam = buf[5]; | |
1129 | tf->lbah = buf[6]; | |
1130 | tf->device = buf[7]; | |
1131 | tf->hob_lbal = buf[8]; | |
1132 | tf->hob_lbam = buf[9]; | |
1133 | tf->hob_lbah = buf[10]; | |
1134 | tf->nsect = buf[12]; | |
1135 | tf->hob_nsect = buf[13]; | |
1136 | ||
1137 | return 0; | |
1138 | } | |
1139 | ||
022bdb07 TH |
1140 | /** |
1141 | * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE | |
1142 | * @dev: device to perform REQUEST_SENSE to | |
1143 | * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long) | |
1144 | * | |
1145 | * Perform ATAPI REQUEST_SENSE after the device reported CHECK | |
1146 | * SENSE. This function is EH helper. | |
1147 | * | |
1148 | * LOCKING: | |
1149 | * Kernel thread context (may sleep). | |
1150 | * | |
1151 | * RETURNS: | |
1152 | * 0 on success, AC_ERR_* mask on failure | |
1153 | */ | |
56287768 | 1154 | static unsigned int atapi_eh_request_sense(struct ata_queued_cmd *qc) |
022bdb07 | 1155 | { |
56287768 AL |
1156 | struct ata_device *dev = qc->dev; |
1157 | unsigned char *sense_buf = qc->scsicmd->sense_buffer; | |
022bdb07 TH |
1158 | struct ata_port *ap = dev->ap; |
1159 | struct ata_taskfile tf; | |
1160 | u8 cdb[ATAPI_CDB_LEN]; | |
1161 | ||
1162 | DPRINTK("ATAPI request sense\n"); | |
1163 | ||
022bdb07 TH |
1164 | /* FIXME: is this needed? */ |
1165 | memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE); | |
1166 | ||
56287768 AL |
1167 | /* initialize sense_buf with the error register, |
1168 | * for the case where they are -not- overwritten | |
1169 | */ | |
022bdb07 | 1170 | sense_buf[0] = 0x70; |
56287768 AL |
1171 | sense_buf[2] = qc->result_tf.feature >> 4; |
1172 | ||
a617c09f | 1173 | /* some devices time out if garbage left in tf */ |
56287768 | 1174 | ata_tf_init(dev, &tf); |
022bdb07 TH |
1175 | |
1176 | memset(cdb, 0, ATAPI_CDB_LEN); | |
1177 | cdb[0] = REQUEST_SENSE; | |
1178 | cdb[4] = SCSI_SENSE_BUFFERSIZE; | |
1179 | ||
1180 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; | |
1181 | tf.command = ATA_CMD_PACKET; | |
1182 | ||
1183 | /* is it pointless to prefer PIO for "safety reasons"? */ | |
1184 | if (ap->flags & ATA_FLAG_PIO_DMA) { | |
1185 | tf.protocol = ATA_PROT_ATAPI_DMA; | |
1186 | tf.feature |= ATAPI_PKT_DMA; | |
1187 | } else { | |
1188 | tf.protocol = ATA_PROT_ATAPI; | |
1189 | tf.lbam = (8 * 1024) & 0xff; | |
1190 | tf.lbah = (8 * 1024) >> 8; | |
1191 | } | |
1192 | ||
1193 | return ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE, | |
1194 | sense_buf, SCSI_SENSE_BUFFERSIZE); | |
1195 | } | |
1196 | ||
1197 | /** | |
1198 | * ata_eh_analyze_serror - analyze SError for a failed port | |
1199 | * @ap: ATA port to analyze SError for | |
1200 | * | |
1201 | * Analyze SError if available and further determine cause of | |
1202 | * failure. | |
1203 | * | |
1204 | * LOCKING: | |
1205 | * None. | |
1206 | */ | |
1207 | static void ata_eh_analyze_serror(struct ata_port *ap) | |
1208 | { | |
1209 | struct ata_eh_context *ehc = &ap->eh_context; | |
1210 | u32 serror = ehc->i.serror; | |
1211 | unsigned int err_mask = 0, action = 0; | |
1212 | ||
1213 | if (serror & SERR_PERSISTENT) { | |
1214 | err_mask |= AC_ERR_ATA_BUS; | |
1215 | action |= ATA_EH_HARDRESET; | |
1216 | } | |
1217 | if (serror & | |
1218 | (SERR_DATA_RECOVERED | SERR_COMM_RECOVERED | SERR_DATA)) { | |
1219 | err_mask |= AC_ERR_ATA_BUS; | |
1220 | action |= ATA_EH_SOFTRESET; | |
1221 | } | |
1222 | if (serror & SERR_PROTOCOL) { | |
1223 | err_mask |= AC_ERR_HSM; | |
1224 | action |= ATA_EH_SOFTRESET; | |
1225 | } | |
1226 | if (serror & SERR_INTERNAL) { | |
1227 | err_mask |= AC_ERR_SYSTEM; | |
771b8dad | 1228 | action |= ATA_EH_HARDRESET; |
022bdb07 | 1229 | } |
084fe639 TH |
1230 | if (serror & (SERR_PHYRDY_CHG | SERR_DEV_XCHG)) |
1231 | ata_ehi_hotplugged(&ehc->i); | |
022bdb07 TH |
1232 | |
1233 | ehc->i.err_mask |= err_mask; | |
1234 | ehc->i.action |= action; | |
1235 | } | |
1236 | ||
e8ee8451 TH |
1237 | /** |
1238 | * ata_eh_analyze_ncq_error - analyze NCQ error | |
1239 | * @ap: ATA port to analyze NCQ error for | |
1240 | * | |
1241 | * Read log page 10h, determine the offending qc and acquire | |
1242 | * error status TF. For NCQ device errors, all LLDDs have to do | |
1243 | * is setting AC_ERR_DEV in ehi->err_mask. This function takes | |
1244 | * care of the rest. | |
1245 | * | |
1246 | * LOCKING: | |
1247 | * Kernel thread context (may sleep). | |
1248 | */ | |
1249 | static void ata_eh_analyze_ncq_error(struct ata_port *ap) | |
1250 | { | |
1251 | struct ata_eh_context *ehc = &ap->eh_context; | |
1252 | struct ata_device *dev = ap->device; | |
1253 | struct ata_queued_cmd *qc; | |
1254 | struct ata_taskfile tf; | |
1255 | int tag, rc; | |
1256 | ||
1257 | /* if frozen, we can't do much */ | |
b51e9e5d | 1258 | if (ap->pflags & ATA_PFLAG_FROZEN) |
e8ee8451 TH |
1259 | return; |
1260 | ||
1261 | /* is it NCQ device error? */ | |
1262 | if (!ap->sactive || !(ehc->i.err_mask & AC_ERR_DEV)) | |
1263 | return; | |
1264 | ||
1265 | /* has LLDD analyzed already? */ | |
1266 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1267 | qc = __ata_qc_from_tag(ap, tag); | |
1268 | ||
1269 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
1270 | continue; | |
1271 | ||
1272 | if (qc->err_mask) | |
1273 | return; | |
1274 | } | |
1275 | ||
1276 | /* okay, this error is ours */ | |
1277 | rc = ata_eh_read_log_10h(dev, &tag, &tf); | |
1278 | if (rc) { | |
1279 | ata_port_printk(ap, KERN_ERR, "failed to read log page 10h " | |
1280 | "(errno=%d)\n", rc); | |
1281 | return; | |
1282 | } | |
1283 | ||
1284 | if (!(ap->sactive & (1 << tag))) { | |
1285 | ata_port_printk(ap, KERN_ERR, "log page 10h reported " | |
1286 | "inactive tag %d\n", tag); | |
1287 | return; | |
1288 | } | |
1289 | ||
1290 | /* we've got the perpetrator, condemn it */ | |
1291 | qc = __ata_qc_from_tag(ap, tag); | |
1292 | memcpy(&qc->result_tf, &tf, sizeof(tf)); | |
5335b729 | 1293 | qc->err_mask |= AC_ERR_DEV | AC_ERR_NCQ; |
e8ee8451 TH |
1294 | ehc->i.err_mask &= ~AC_ERR_DEV; |
1295 | } | |
1296 | ||
022bdb07 TH |
1297 | /** |
1298 | * ata_eh_analyze_tf - analyze taskfile of a failed qc | |
1299 | * @qc: qc to analyze | |
1300 | * @tf: Taskfile registers to analyze | |
1301 | * | |
1302 | * Analyze taskfile of @qc and further determine cause of | |
1303 | * failure. This function also requests ATAPI sense data if | |
1304 | * avaliable. | |
1305 | * | |
1306 | * LOCKING: | |
1307 | * Kernel thread context (may sleep). | |
1308 | * | |
1309 | * RETURNS: | |
1310 | * Determined recovery action | |
1311 | */ | |
1312 | static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd *qc, | |
1313 | const struct ata_taskfile *tf) | |
1314 | { | |
1315 | unsigned int tmp, action = 0; | |
1316 | u8 stat = tf->command, err = tf->feature; | |
1317 | ||
1318 | if ((stat & (ATA_BUSY | ATA_DRQ | ATA_DRDY)) != ATA_DRDY) { | |
1319 | qc->err_mask |= AC_ERR_HSM; | |
1320 | return ATA_EH_SOFTRESET; | |
1321 | } | |
1322 | ||
a51d644a TH |
1323 | if (stat & (ATA_ERR | ATA_DF)) |
1324 | qc->err_mask |= AC_ERR_DEV; | |
1325 | else | |
022bdb07 TH |
1326 | return 0; |
1327 | ||
1328 | switch (qc->dev->class) { | |
1329 | case ATA_DEV_ATA: | |
1330 | if (err & ATA_ICRC) | |
1331 | qc->err_mask |= AC_ERR_ATA_BUS; | |
1332 | if (err & ATA_UNC) | |
1333 | qc->err_mask |= AC_ERR_MEDIA; | |
1334 | if (err & ATA_IDNF) | |
1335 | qc->err_mask |= AC_ERR_INVALID; | |
1336 | break; | |
1337 | ||
1338 | case ATA_DEV_ATAPI: | |
a569a30d | 1339 | if (!(qc->ap->pflags & ATA_PFLAG_FROZEN)) { |
56287768 | 1340 | tmp = atapi_eh_request_sense(qc); |
a569a30d TH |
1341 | if (!tmp) { |
1342 | /* ATA_QCFLAG_SENSE_VALID is used to | |
1343 | * tell atapi_qc_complete() that sense | |
1344 | * data is already valid. | |
1345 | * | |
1346 | * TODO: interpret sense data and set | |
1347 | * appropriate err_mask. | |
1348 | */ | |
1349 | qc->flags |= ATA_QCFLAG_SENSE_VALID; | |
1350 | } else | |
1351 | qc->err_mask |= tmp; | |
1352 | } | |
022bdb07 TH |
1353 | } |
1354 | ||
1355 | if (qc->err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT | AC_ERR_ATA_BUS)) | |
1356 | action |= ATA_EH_SOFTRESET; | |
1357 | ||
1358 | return action; | |
1359 | } | |
1360 | ||
7d47e8d4 | 1361 | static int ata_eh_categorize_error(int is_io, unsigned int err_mask) |
022bdb07 | 1362 | { |
7d47e8d4 | 1363 | if (err_mask & AC_ERR_ATA_BUS) |
022bdb07 TH |
1364 | return 1; |
1365 | ||
7d47e8d4 TH |
1366 | if (err_mask & AC_ERR_TIMEOUT) |
1367 | return 2; | |
1368 | ||
1369 | if (is_io) { | |
1370 | if (err_mask & AC_ERR_HSM) | |
022bdb07 | 1371 | return 2; |
7d47e8d4 TH |
1372 | if ((err_mask & |
1373 | (AC_ERR_DEV|AC_ERR_MEDIA|AC_ERR_INVALID)) == AC_ERR_DEV) | |
1374 | return 3; | |
022bdb07 TH |
1375 | } |
1376 | ||
1377 | return 0; | |
1378 | } | |
1379 | ||
7d47e8d4 | 1380 | struct speed_down_verdict_arg { |
022bdb07 | 1381 | u64 since; |
7d47e8d4 | 1382 | int nr_errors[4]; |
022bdb07 TH |
1383 | }; |
1384 | ||
7d47e8d4 | 1385 | static int speed_down_verdict_cb(struct ata_ering_entry *ent, void *void_arg) |
022bdb07 | 1386 | { |
7d47e8d4 TH |
1387 | struct speed_down_verdict_arg *arg = void_arg; |
1388 | int cat = ata_eh_categorize_error(ent->is_io, ent->err_mask); | |
022bdb07 TH |
1389 | |
1390 | if (ent->timestamp < arg->since) | |
1391 | return -1; | |
1392 | ||
7d47e8d4 | 1393 | arg->nr_errors[cat]++; |
022bdb07 TH |
1394 | return 0; |
1395 | } | |
1396 | ||
1397 | /** | |
7d47e8d4 | 1398 | * ata_eh_speed_down_verdict - Determine speed down verdict |
022bdb07 TH |
1399 | * @dev: Device of interest |
1400 | * | |
1401 | * This function examines error ring of @dev and determines | |
7d47e8d4 TH |
1402 | * whether NCQ needs to be turned off, transfer speed should be |
1403 | * stepped down, or falling back to PIO is necessary. | |
022bdb07 | 1404 | * |
7d47e8d4 | 1405 | * Cat-1 is ATA_BUS error for any command. |
022bdb07 | 1406 | * |
7d47e8d4 TH |
1407 | * Cat-2 is TIMEOUT for any command or HSM violation for known |
1408 | * supported commands. | |
1409 | * | |
1410 | * Cat-3 is is unclassified DEV error for known supported | |
022bdb07 TH |
1411 | * command. |
1412 | * | |
7d47e8d4 TH |
1413 | * NCQ needs to be turned off if there have been more than 3 |
1414 | * Cat-2 + Cat-3 errors during last 10 minutes. | |
1415 | * | |
1416 | * Speed down is necessary if there have been more than 3 Cat-1 + | |
1417 | * Cat-2 errors or 10 Cat-3 errors during last 10 minutes. | |
1418 | * | |
1419 | * Falling back to PIO mode is necessary if there have been more | |
1420 | * than 10 Cat-1 + Cat-2 + Cat-3 errors during last 5 minutes. | |
1421 | * | |
022bdb07 TH |
1422 | * LOCKING: |
1423 | * Inherited from caller. | |
1424 | * | |
1425 | * RETURNS: | |
7d47e8d4 | 1426 | * OR of ATA_EH_SPDN_* flags. |
022bdb07 | 1427 | */ |
7d47e8d4 | 1428 | static unsigned int ata_eh_speed_down_verdict(struct ata_device *dev) |
022bdb07 | 1429 | { |
7d47e8d4 TH |
1430 | const u64 j5mins = 5LLU * 60 * HZ, j10mins = 10LLU * 60 * HZ; |
1431 | u64 j64 = get_jiffies_64(); | |
1432 | struct speed_down_verdict_arg arg; | |
1433 | unsigned int verdict = 0; | |
022bdb07 | 1434 | |
7d47e8d4 TH |
1435 | /* scan past 10 mins of error history */ |
1436 | memset(&arg, 0, sizeof(arg)); | |
1437 | arg.since = j64 - min(j64, j10mins); | |
1438 | ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg); | |
022bdb07 | 1439 | |
7d47e8d4 TH |
1440 | if (arg.nr_errors[2] + arg.nr_errors[3] > 3) |
1441 | verdict |= ATA_EH_SPDN_NCQ_OFF; | |
1442 | if (arg.nr_errors[1] + arg.nr_errors[2] > 3 || arg.nr_errors[3] > 10) | |
1443 | verdict |= ATA_EH_SPDN_SPEED_DOWN; | |
022bdb07 | 1444 | |
7d47e8d4 | 1445 | /* scan past 3 mins of error history */ |
022bdb07 | 1446 | memset(&arg, 0, sizeof(arg)); |
7d47e8d4 TH |
1447 | arg.since = j64 - min(j64, j5mins); |
1448 | ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg); | |
022bdb07 | 1449 | |
7d47e8d4 TH |
1450 | if (arg.nr_errors[1] + arg.nr_errors[2] + arg.nr_errors[3] > 10) |
1451 | verdict |= ATA_EH_SPDN_FALLBACK_TO_PIO; | |
022bdb07 | 1452 | |
7d47e8d4 | 1453 | return verdict; |
022bdb07 TH |
1454 | } |
1455 | ||
1456 | /** | |
1457 | * ata_eh_speed_down - record error and speed down if necessary | |
1458 | * @dev: Failed device | |
1459 | * @is_io: Did the device fail during normal IO? | |
1460 | * @err_mask: err_mask of the error | |
1461 | * | |
1462 | * Record error and examine error history to determine whether | |
1463 | * adjusting transmission speed is necessary. It also sets | |
1464 | * transmission limits appropriately if such adjustment is | |
1465 | * necessary. | |
1466 | * | |
1467 | * LOCKING: | |
1468 | * Kernel thread context (may sleep). | |
1469 | * | |
1470 | * RETURNS: | |
7d47e8d4 | 1471 | * Determined recovery action. |
022bdb07 | 1472 | */ |
7d47e8d4 TH |
1473 | static unsigned int ata_eh_speed_down(struct ata_device *dev, int is_io, |
1474 | unsigned int err_mask) | |
022bdb07 | 1475 | { |
7d47e8d4 TH |
1476 | unsigned int verdict; |
1477 | unsigned int action = 0; | |
1478 | ||
1479 | /* don't bother if Cat-0 error */ | |
1480 | if (ata_eh_categorize_error(is_io, err_mask) == 0) | |
022bdb07 TH |
1481 | return 0; |
1482 | ||
1483 | /* record error and determine whether speed down is necessary */ | |
1484 | ata_ering_record(&dev->ering, is_io, err_mask); | |
7d47e8d4 | 1485 | verdict = ata_eh_speed_down_verdict(dev); |
022bdb07 | 1486 | |
7d47e8d4 TH |
1487 | /* turn off NCQ? */ |
1488 | if ((verdict & ATA_EH_SPDN_NCQ_OFF) && | |
1489 | (dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ | | |
1490 | ATA_DFLAG_NCQ_OFF)) == ATA_DFLAG_NCQ) { | |
1491 | dev->flags |= ATA_DFLAG_NCQ_OFF; | |
1492 | ata_dev_printk(dev, KERN_WARNING, | |
1493 | "NCQ disabled due to excessive errors\n"); | |
1494 | goto done; | |
1495 | } | |
022bdb07 | 1496 | |
7d47e8d4 TH |
1497 | /* speed down? */ |
1498 | if (verdict & ATA_EH_SPDN_SPEED_DOWN) { | |
1499 | /* speed down SATA link speed if possible */ | |
1500 | if (sata_down_spd_limit(dev->ap) == 0) { | |
1501 | action |= ATA_EH_HARDRESET; | |
1502 | goto done; | |
1503 | } | |
022bdb07 | 1504 | |
7d47e8d4 TH |
1505 | /* lower transfer mode */ |
1506 | if (dev->spdn_cnt < 2) { | |
1507 | static const int dma_dnxfer_sel[] = | |
1508 | { ATA_DNXFER_DMA, ATA_DNXFER_40C }; | |
1509 | static const int pio_dnxfer_sel[] = | |
1510 | { ATA_DNXFER_PIO, ATA_DNXFER_FORCE_PIO0 }; | |
1511 | int sel; | |
1512 | ||
1513 | if (dev->xfer_shift != ATA_SHIFT_PIO) | |
1514 | sel = dma_dnxfer_sel[dev->spdn_cnt]; | |
1515 | else | |
1516 | sel = pio_dnxfer_sel[dev->spdn_cnt]; | |
1517 | ||
1518 | dev->spdn_cnt++; | |
1519 | ||
1520 | if (ata_down_xfermask_limit(dev, sel) == 0) { | |
1521 | action |= ATA_EH_SOFTRESET; | |
1522 | goto done; | |
1523 | } | |
1524 | } | |
1525 | } | |
1526 | ||
1527 | /* Fall back to PIO? Slowing down to PIO is meaningless for | |
1528 | * SATA. Consider it only for PATA. | |
1529 | */ | |
1530 | if ((verdict & ATA_EH_SPDN_FALLBACK_TO_PIO) && (dev->spdn_cnt >= 2) && | |
1531 | (dev->ap->cbl != ATA_CBL_SATA) && | |
1532 | (dev->xfer_shift != ATA_SHIFT_PIO)) { | |
1533 | if (ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO) == 0) { | |
1534 | dev->spdn_cnt = 0; | |
1535 | action |= ATA_EH_SOFTRESET; | |
1536 | goto done; | |
1537 | } | |
1538 | } | |
022bdb07 | 1539 | |
022bdb07 | 1540 | return 0; |
7d47e8d4 TH |
1541 | done: |
1542 | /* device has been slowed down, blow error history */ | |
1543 | ata_ering_clear(&dev->ering); | |
1544 | return action; | |
022bdb07 TH |
1545 | } |
1546 | ||
1547 | /** | |
1548 | * ata_eh_autopsy - analyze error and determine recovery action | |
1549 | * @ap: ATA port to perform autopsy on | |
1550 | * | |
1551 | * Analyze why @ap failed and determine which recovery action is | |
1552 | * needed. This function also sets more detailed AC_ERR_* values | |
1553 | * and fills sense data for ATAPI CHECK SENSE. | |
1554 | * | |
1555 | * LOCKING: | |
1556 | * Kernel thread context (may sleep). | |
1557 | */ | |
1558 | static void ata_eh_autopsy(struct ata_port *ap) | |
1559 | { | |
1560 | struct ata_eh_context *ehc = &ap->eh_context; | |
022bdb07 TH |
1561 | unsigned int all_err_mask = 0; |
1562 | int tag, is_io = 0; | |
1563 | u32 serror; | |
1564 | int rc; | |
1565 | ||
1566 | DPRINTK("ENTER\n"); | |
1567 | ||
1cdaf534 TH |
1568 | if (ehc->i.flags & ATA_EHI_NO_AUTOPSY) |
1569 | return; | |
1570 | ||
022bdb07 TH |
1571 | /* obtain and analyze SError */ |
1572 | rc = sata_scr_read(ap, SCR_ERROR, &serror); | |
1573 | if (rc == 0) { | |
1574 | ehc->i.serror |= serror; | |
1575 | ata_eh_analyze_serror(ap); | |
4e57c517 TH |
1576 | } else if (rc != -EOPNOTSUPP) { |
1577 | /* SError read failed, force hardreset and probing */ | |
1578 | ata_ehi_schedule_probe(&ehc->i); | |
4528e4da | 1579 | ehc->i.action |= ATA_EH_HARDRESET; |
4e57c517 TH |
1580 | ehc->i.err_mask |= AC_ERR_OTHER; |
1581 | } | |
022bdb07 | 1582 | |
e8ee8451 TH |
1583 | /* analyze NCQ failure */ |
1584 | ata_eh_analyze_ncq_error(ap); | |
1585 | ||
022bdb07 TH |
1586 | /* any real error trumps AC_ERR_OTHER */ |
1587 | if (ehc->i.err_mask & ~AC_ERR_OTHER) | |
1588 | ehc->i.err_mask &= ~AC_ERR_OTHER; | |
1589 | ||
1590 | all_err_mask |= ehc->i.err_mask; | |
1591 | ||
1592 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1593 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
1594 | ||
1595 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
1596 | continue; | |
1597 | ||
1598 | /* inherit upper level err_mask */ | |
1599 | qc->err_mask |= ehc->i.err_mask; | |
1600 | ||
022bdb07 | 1601 | /* analyze TF */ |
4528e4da | 1602 | ehc->i.action |= ata_eh_analyze_tf(qc, &qc->result_tf); |
022bdb07 TH |
1603 | |
1604 | /* DEV errors are probably spurious in case of ATA_BUS error */ | |
1605 | if (qc->err_mask & AC_ERR_ATA_BUS) | |
1606 | qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_MEDIA | | |
1607 | AC_ERR_INVALID); | |
1608 | ||
1609 | /* any real error trumps unknown error */ | |
1610 | if (qc->err_mask & ~AC_ERR_OTHER) | |
1611 | qc->err_mask &= ~AC_ERR_OTHER; | |
1612 | ||
1613 | /* SENSE_VALID trumps dev/unknown error and revalidation */ | |
1614 | if (qc->flags & ATA_QCFLAG_SENSE_VALID) { | |
1615 | qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_OTHER); | |
4528e4da | 1616 | ehc->i.action &= ~ATA_EH_REVALIDATE; |
022bdb07 TH |
1617 | } |
1618 | ||
1619 | /* accumulate error info */ | |
4528e4da | 1620 | ehc->i.dev = qc->dev; |
022bdb07 TH |
1621 | all_err_mask |= qc->err_mask; |
1622 | if (qc->flags & ATA_QCFLAG_IO) | |
1623 | is_io = 1; | |
1624 | } | |
1625 | ||
a20f33ff | 1626 | /* enforce default EH actions */ |
b51e9e5d | 1627 | if (ap->pflags & ATA_PFLAG_FROZEN || |
a20f33ff | 1628 | all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT)) |
4528e4da | 1629 | ehc->i.action |= ATA_EH_SOFTRESET; |
a20f33ff | 1630 | else if (all_err_mask) |
4528e4da | 1631 | ehc->i.action |= ATA_EH_REVALIDATE; |
022bdb07 | 1632 | |
47005f25 | 1633 | /* if we have offending qcs and the associated failed device */ |
4528e4da | 1634 | if (ehc->i.dev) { |
47005f25 | 1635 | /* speed down */ |
4528e4da TH |
1636 | ehc->i.action |= ata_eh_speed_down(ehc->i.dev, is_io, |
1637 | all_err_mask); | |
47005f25 TH |
1638 | |
1639 | /* perform per-dev EH action only on the offending device */ | |
4528e4da TH |
1640 | ehc->i.dev_action[ehc->i.dev->devno] |= |
1641 | ehc->i.action & ATA_EH_PERDEV_MASK; | |
1642 | ehc->i.action &= ~ATA_EH_PERDEV_MASK; | |
47005f25 TH |
1643 | } |
1644 | ||
022bdb07 TH |
1645 | DPRINTK("EXIT\n"); |
1646 | } | |
1647 | ||
1648 | /** | |
1649 | * ata_eh_report - report error handling to user | |
1650 | * @ap: ATA port EH is going on | |
1651 | * | |
1652 | * Report EH to user. | |
1653 | * | |
1654 | * LOCKING: | |
1655 | * None. | |
1656 | */ | |
1657 | static void ata_eh_report(struct ata_port *ap) | |
1658 | { | |
1659 | struct ata_eh_context *ehc = &ap->eh_context; | |
1660 | const char *frozen, *desc; | |
1661 | int tag, nr_failed = 0; | |
1662 | ||
1663 | desc = NULL; | |
1664 | if (ehc->i.desc[0] != '\0') | |
1665 | desc = ehc->i.desc; | |
1666 | ||
1667 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1668 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
1669 | ||
1670 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
1671 | continue; | |
1672 | if (qc->flags & ATA_QCFLAG_SENSE_VALID && !qc->err_mask) | |
1673 | continue; | |
1674 | ||
1675 | nr_failed++; | |
1676 | } | |
1677 | ||
1678 | if (!nr_failed && !ehc->i.err_mask) | |
1679 | return; | |
1680 | ||
1681 | frozen = ""; | |
b51e9e5d | 1682 | if (ap->pflags & ATA_PFLAG_FROZEN) |
022bdb07 TH |
1683 | frozen = " frozen"; |
1684 | ||
1685 | if (ehc->i.dev) { | |
e8ee8451 TH |
1686 | ata_dev_printk(ehc->i.dev, KERN_ERR, "exception Emask 0x%x " |
1687 | "SAct 0x%x SErr 0x%x action 0x%x%s\n", | |
1688 | ehc->i.err_mask, ap->sactive, ehc->i.serror, | |
1689 | ehc->i.action, frozen); | |
022bdb07 | 1690 | if (desc) |
b64bbc39 | 1691 | ata_dev_printk(ehc->i.dev, KERN_ERR, "%s\n", desc); |
022bdb07 | 1692 | } else { |
e8ee8451 TH |
1693 | ata_port_printk(ap, KERN_ERR, "exception Emask 0x%x " |
1694 | "SAct 0x%x SErr 0x%x action 0x%x%s\n", | |
1695 | ehc->i.err_mask, ap->sactive, ehc->i.serror, | |
1696 | ehc->i.action, frozen); | |
022bdb07 | 1697 | if (desc) |
b64bbc39 | 1698 | ata_port_printk(ap, KERN_ERR, "%s\n", desc); |
022bdb07 TH |
1699 | } |
1700 | ||
1701 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
8a937581 TH |
1702 | static const char *dma_str[] = { |
1703 | [DMA_BIDIRECTIONAL] = "bidi", | |
1704 | [DMA_TO_DEVICE] = "out", | |
1705 | [DMA_FROM_DEVICE] = "in", | |
1706 | [DMA_NONE] = "", | |
1707 | }; | |
022bdb07 | 1708 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); |
8a937581 | 1709 | struct ata_taskfile *cmd = &qc->tf, *res = &qc->result_tf; |
022bdb07 TH |
1710 | |
1711 | if (!(qc->flags & ATA_QCFLAG_FAILED) || !qc->err_mask) | |
1712 | continue; | |
1713 | ||
8a937581 TH |
1714 | ata_dev_printk(qc->dev, KERN_ERR, |
1715 | "cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x " | |
664e8503 | 1716 | "tag %d cdb 0x%x data %u %s\n " |
8a937581 | 1717 | "res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x " |
5335b729 | 1718 | "Emask 0x%x (%s)%s\n", |
8a937581 TH |
1719 | cmd->command, cmd->feature, cmd->nsect, |
1720 | cmd->lbal, cmd->lbam, cmd->lbah, | |
1721 | cmd->hob_feature, cmd->hob_nsect, | |
1722 | cmd->hob_lbal, cmd->hob_lbam, cmd->hob_lbah, | |
726f0785 | 1723 | cmd->device, qc->tag, qc->cdb[0], qc->nbytes, |
664e8503 | 1724 | dma_str[qc->dma_dir], |
8a937581 TH |
1725 | res->command, res->feature, res->nsect, |
1726 | res->lbal, res->lbam, res->lbah, | |
1727 | res->hob_feature, res->hob_nsect, | |
1728 | res->hob_lbal, res->hob_lbam, res->hob_lbah, | |
5335b729 TH |
1729 | res->device, qc->err_mask, ata_err_string(qc->err_mask), |
1730 | qc->err_mask & AC_ERR_NCQ ? " <F>" : ""); | |
022bdb07 TH |
1731 | } |
1732 | } | |
1733 | ||
d87fa38e | 1734 | static int ata_do_reset(struct ata_port *ap, ata_reset_fn_t reset, |
d4b2bab4 | 1735 | unsigned int *classes, unsigned long deadline) |
d87fa38e TH |
1736 | { |
1737 | int i, rc; | |
1738 | ||
1739 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1740 | classes[i] = ATA_DEV_UNKNOWN; | |
1741 | ||
d4b2bab4 | 1742 | rc = reset(ap, classes, deadline); |
d87fa38e TH |
1743 | if (rc) |
1744 | return rc; | |
1745 | ||
1746 | /* If any class isn't ATA_DEV_UNKNOWN, consider classification | |
1747 | * is complete and convert all ATA_DEV_UNKNOWN to | |
1748 | * ATA_DEV_NONE. | |
1749 | */ | |
1750 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1751 | if (classes[i] != ATA_DEV_UNKNOWN) | |
1752 | break; | |
1753 | ||
1754 | if (i < ATA_MAX_DEVICES) | |
1755 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1756 | if (classes[i] == ATA_DEV_UNKNOWN) | |
1757 | classes[i] = ATA_DEV_NONE; | |
1758 | ||
1759 | return 0; | |
1760 | } | |
1761 | ||
664faf09 TH |
1762 | static int ata_eh_followup_srst_needed(int rc, int classify, |
1763 | const unsigned int *classes) | |
1764 | { | |
1765 | if (rc == -EAGAIN) | |
1766 | return 1; | |
1767 | if (rc != 0) | |
1768 | return 0; | |
1769 | if (classify && classes[0] == ATA_DEV_UNKNOWN) | |
1770 | return 1; | |
1771 | return 0; | |
1772 | } | |
1773 | ||
1774 | static int ata_eh_reset(struct ata_port *ap, int classify, | |
f5914a46 | 1775 | ata_prereset_fn_t prereset, ata_reset_fn_t softreset, |
022bdb07 TH |
1776 | ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) |
1777 | { | |
1778 | struct ata_eh_context *ehc = &ap->eh_context; | |
664faf09 | 1779 | unsigned int *classes = ehc->classes; |
1cdaf534 | 1780 | int verbose = !(ehc->i.flags & ATA_EHI_QUIET); |
31daabda TH |
1781 | int try = 0; |
1782 | unsigned long deadline; | |
f5914a46 | 1783 | unsigned int action; |
022bdb07 | 1784 | ata_reset_fn_t reset; |
8b5bb2fa | 1785 | int i, rc; |
022bdb07 | 1786 | |
13abf50d TH |
1787 | /* about to reset */ |
1788 | ata_eh_about_to_do(ap, NULL, ehc->i.action & ATA_EH_RESET_MASK); | |
1789 | ||
f5914a46 TH |
1790 | /* Determine which reset to use and record in ehc->i.action. |
1791 | * prereset() may examine and modify it. | |
1792 | */ | |
1793 | action = ehc->i.action; | |
1794 | ehc->i.action &= ~ATA_EH_RESET_MASK; | |
022bdb07 | 1795 | if (softreset && (!hardreset || (!sata_set_spd_needed(ap) && |
f5914a46 TH |
1796 | !(action & ATA_EH_HARDRESET)))) |
1797 | ehc->i.action |= ATA_EH_SOFTRESET; | |
022bdb07 | 1798 | else |
f5914a46 TH |
1799 | ehc->i.action |= ATA_EH_HARDRESET; |
1800 | ||
1801 | if (prereset) { | |
31daabda | 1802 | rc = prereset(ap, jiffies + ATA_EH_PRERESET_TIMEOUT); |
f5914a46 | 1803 | if (rc) { |
c961922b | 1804 | if (rc == -ENOENT) { |
4aa9ab67 TH |
1805 | ata_port_printk(ap, KERN_DEBUG, |
1806 | "port disabled. ignoring.\n"); | |
c961922b | 1807 | ap->eh_context.i.action &= ~ATA_EH_RESET_MASK; |
4aa9ab67 TH |
1808 | |
1809 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1810 | classes[i] = ATA_DEV_NONE; | |
1811 | ||
1812 | rc = 0; | |
c961922b AC |
1813 | } else |
1814 | ata_port_printk(ap, KERN_ERR, | |
f5914a46 | 1815 | "prereset failed (errno=%d)\n", rc); |
fccb6ea5 | 1816 | goto out; |
f5914a46 TH |
1817 | } |
1818 | } | |
1819 | ||
1820 | /* prereset() might have modified ehc->i.action */ | |
1821 | if (ehc->i.action & ATA_EH_HARDRESET) | |
022bdb07 | 1822 | reset = hardreset; |
f5914a46 TH |
1823 | else if (ehc->i.action & ATA_EH_SOFTRESET) |
1824 | reset = softreset; | |
1825 | else { | |
1826 | /* prereset told us not to reset, bang classes and return */ | |
1827 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1828 | classes[i] = ATA_DEV_NONE; | |
fccb6ea5 TH |
1829 | rc = 0; |
1830 | goto out; | |
f5914a46 TH |
1831 | } |
1832 | ||
1833 | /* did prereset() screw up? if so, fix up to avoid oopsing */ | |
1834 | if (!reset) { | |
f5914a46 TH |
1835 | if (softreset) |
1836 | reset = softreset; | |
1837 | else | |
1838 | reset = hardreset; | |
1839 | } | |
022bdb07 TH |
1840 | |
1841 | retry: | |
31daabda TH |
1842 | deadline = jiffies + ata_eh_reset_timeouts[try++]; |
1843 | ||
3e706399 TH |
1844 | /* shut up during boot probing */ |
1845 | if (verbose) | |
1846 | ata_port_printk(ap, KERN_INFO, "%s resetting port\n", | |
1847 | reset == softreset ? "soft" : "hard"); | |
022bdb07 | 1848 | |
13abf50d | 1849 | /* mark that this EH session started with reset */ |
0d64a233 TH |
1850 | if (reset == hardreset) |
1851 | ehc->i.flags |= ATA_EHI_DID_HARDRESET; | |
1852 | else | |
1853 | ehc->i.flags |= ATA_EHI_DID_SOFTRESET; | |
022bdb07 | 1854 | |
31daabda | 1855 | rc = ata_do_reset(ap, reset, classes, deadline); |
022bdb07 | 1856 | |
664faf09 TH |
1857 | if (reset == hardreset && |
1858 | ata_eh_followup_srst_needed(rc, classify, classes)) { | |
1859 | /* okay, let's do follow-up softreset */ | |
664faf09 TH |
1860 | reset = softreset; |
1861 | ||
1862 | if (!reset) { | |
1863 | ata_port_printk(ap, KERN_ERR, | |
1864 | "follow-up softreset required " | |
1865 | "but no softreset avaliable\n"); | |
fccb6ea5 TH |
1866 | rc = -EINVAL; |
1867 | goto out; | |
664faf09 TH |
1868 | } |
1869 | ||
47005f25 | 1870 | ata_eh_about_to_do(ap, NULL, ATA_EH_RESET_MASK); |
31daabda | 1871 | rc = ata_do_reset(ap, reset, classes, deadline); |
664faf09 TH |
1872 | |
1873 | if (rc == 0 && classify && | |
1874 | classes[0] == ATA_DEV_UNKNOWN) { | |
1875 | ata_port_printk(ap, KERN_ERR, | |
1876 | "classification failed\n"); | |
fccb6ea5 TH |
1877 | rc = -EINVAL; |
1878 | goto out; | |
664faf09 TH |
1879 | } |
1880 | } | |
1881 | ||
31daabda TH |
1882 | if (rc && try < ARRAY_SIZE(ata_eh_reset_timeouts)) { |
1883 | unsigned long now = jiffies; | |
664faf09 | 1884 | |
31daabda TH |
1885 | if (time_before(now, deadline)) { |
1886 | unsigned long delta = deadline - jiffies; | |
664faf09 | 1887 | |
31daabda TH |
1888 | ata_port_printk(ap, KERN_WARNING, "reset failed " |
1889 | "(errno=%d), retrying in %u secs\n", | |
1890 | rc, (jiffies_to_msecs(delta) + 999) / 1000); | |
1891 | ||
1892 | schedule_timeout_uninterruptible(delta); | |
1893 | } | |
022bdb07 | 1894 | |
f1545154 | 1895 | if (rc == -EPIPE || |
31daabda | 1896 | try == ARRAY_SIZE(ata_eh_reset_timeouts) - 1) |
022bdb07 TH |
1897 | sata_down_spd_limit(ap); |
1898 | if (hardreset) | |
1899 | reset = hardreset; | |
1900 | goto retry; | |
1901 | } | |
1902 | ||
1903 | if (rc == 0) { | |
008a7896 TH |
1904 | u32 sstatus; |
1905 | ||
20952b69 TH |
1906 | /* After the reset, the device state is PIO 0 and the |
1907 | * controller state is undefined. Record the mode. | |
1908 | */ | |
1909 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1910 | ap->device[i].pio_mode = XFER_PIO_0; | |
1911 | ||
008a7896 TH |
1912 | /* record current link speed */ |
1913 | if (sata_scr_read(ap, SCR_STATUS, &sstatus) == 0) | |
1914 | ap->sata_spd = (sstatus >> 4) & 0xf; | |
1915 | ||
022bdb07 TH |
1916 | if (postreset) |
1917 | postreset(ap, classes); | |
1918 | ||
1919 | /* reset successful, schedule revalidation */ | |
13abf50d | 1920 | ata_eh_done(ap, NULL, ehc->i.action & ATA_EH_RESET_MASK); |
022bdb07 TH |
1921 | ehc->i.action |= ATA_EH_REVALIDATE; |
1922 | } | |
fccb6ea5 TH |
1923 | out: |
1924 | /* clear hotplug flag */ | |
1925 | ehc->i.flags &= ~ATA_EHI_HOTPLUGGED; | |
022bdb07 TH |
1926 | return rc; |
1927 | } | |
1928 | ||
084fe639 TH |
1929 | static int ata_eh_revalidate_and_attach(struct ata_port *ap, |
1930 | struct ata_device **r_failed_dev) | |
022bdb07 TH |
1931 | { |
1932 | struct ata_eh_context *ehc = &ap->eh_context; | |
1933 | struct ata_device *dev; | |
8c3c52a8 | 1934 | unsigned int new_mask = 0; |
084fe639 | 1935 | unsigned long flags; |
022bdb07 TH |
1936 | int i, rc = 0; |
1937 | ||
1938 | DPRINTK("ENTER\n"); | |
1939 | ||
8c3c52a8 TH |
1940 | /* For PATA drive side cable detection to work, IDENTIFY must |
1941 | * be done backwards such that PDIAG- is released by the slave | |
1942 | * device before the master device is identified. | |
1943 | */ | |
1944 | for (i = ATA_MAX_DEVICES - 1; i >= 0; i--) { | |
bff04647 | 1945 | unsigned int action, readid_flags = 0; |
47005f25 | 1946 | |
022bdb07 | 1947 | dev = &ap->device[i]; |
64f65ca6 | 1948 | action = ata_eh_dev_action(dev); |
022bdb07 | 1949 | |
bff04647 TH |
1950 | if (ehc->i.flags & ATA_EHI_DID_RESET) |
1951 | readid_flags |= ATA_READID_POSTRESET; | |
1952 | ||
9666f400 | 1953 | if ((action & ATA_EH_REVALIDATE) && ata_dev_enabled(dev)) { |
022bdb07 TH |
1954 | if (ata_port_offline(ap)) { |
1955 | rc = -EIO; | |
8c3c52a8 | 1956 | goto err; |
022bdb07 TH |
1957 | } |
1958 | ||
47005f25 | 1959 | ata_eh_about_to_do(ap, dev, ATA_EH_REVALIDATE); |
bff04647 | 1960 | rc = ata_dev_revalidate(dev, readid_flags); |
022bdb07 | 1961 | if (rc) |
8c3c52a8 | 1962 | goto err; |
022bdb07 | 1963 | |
47005f25 TH |
1964 | ata_eh_done(ap, dev, ATA_EH_REVALIDATE); |
1965 | ||
baa1e78a TH |
1966 | /* Configuration may have changed, reconfigure |
1967 | * transfer mode. | |
1968 | */ | |
1969 | ehc->i.flags |= ATA_EHI_SETMODE; | |
1970 | ||
3057ac3c | 1971 | /* schedule the scsi_rescan_device() here */ |
1972 | queue_work(ata_aux_wq, &(ap->scsi_rescan_task)); | |
084fe639 TH |
1973 | } else if (dev->class == ATA_DEV_UNKNOWN && |
1974 | ehc->tries[dev->devno] && | |
1975 | ata_class_enabled(ehc->classes[dev->devno])) { | |
1976 | dev->class = ehc->classes[dev->devno]; | |
1977 | ||
bff04647 TH |
1978 | rc = ata_dev_read_id(dev, &dev->class, readid_flags, |
1979 | dev->id); | |
8c3c52a8 TH |
1980 | switch (rc) { |
1981 | case 0: | |
1982 | new_mask |= 1 << i; | |
1983 | break; | |
1984 | case -ENOENT: | |
55a8e2c8 TH |
1985 | /* IDENTIFY was issued to non-existent |
1986 | * device. No need to reset. Just | |
1987 | * thaw and kill the device. | |
1988 | */ | |
1989 | ata_eh_thaw_port(ap); | |
084fe639 TH |
1990 | dev->class = ATA_DEV_UNKNOWN; |
1991 | break; | |
8c3c52a8 TH |
1992 | default: |
1993 | dev->class = ATA_DEV_UNKNOWN; | |
1994 | goto err; | |
084fe639 | 1995 | } |
8c3c52a8 TH |
1996 | } |
1997 | } | |
084fe639 | 1998 | |
c1c4e8d5 TH |
1999 | /* PDIAG- should have been released, ask cable type if post-reset */ |
2000 | if ((ehc->i.flags & ATA_EHI_DID_RESET) && ap->ops->cable_detect) | |
2001 | ap->cbl = ap->ops->cable_detect(ap); | |
2002 | ||
8c3c52a8 TH |
2003 | /* Configure new devices forward such that user doesn't see |
2004 | * device detection messages backwards. | |
2005 | */ | |
2006 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
2007 | dev = &ap->device[i]; | |
baa1e78a | 2008 | |
8c3c52a8 TH |
2009 | if (!(new_mask & (1 << i))) |
2010 | continue; | |
2011 | ||
2012 | ehc->i.flags |= ATA_EHI_PRINTINFO; | |
2013 | rc = ata_dev_configure(dev); | |
2014 | ehc->i.flags &= ~ATA_EHI_PRINTINFO; | |
2015 | if (rc) | |
2016 | goto err; | |
2017 | ||
2018 | spin_lock_irqsave(ap->lock, flags); | |
2019 | ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG; | |
2020 | spin_unlock_irqrestore(ap->lock, flags); | |
2021 | ||
2022 | /* new device discovered, configure xfermode */ | |
2023 | ehc->i.flags |= ATA_EHI_SETMODE; | |
022bdb07 TH |
2024 | } |
2025 | ||
8c3c52a8 | 2026 | return 0; |
022bdb07 | 2027 | |
8c3c52a8 TH |
2028 | err: |
2029 | *r_failed_dev = dev; | |
2030 | DPRINTK("EXIT rc=%d\n", rc); | |
022bdb07 TH |
2031 | return rc; |
2032 | } | |
2033 | ||
2034 | static int ata_port_nr_enabled(struct ata_port *ap) | |
2035 | { | |
2036 | int i, cnt = 0; | |
2037 | ||
2038 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
2039 | if (ata_dev_enabled(&ap->device[i])) | |
2040 | cnt++; | |
2041 | return cnt; | |
2042 | } | |
2043 | ||
084fe639 TH |
2044 | static int ata_port_nr_vacant(struct ata_port *ap) |
2045 | { | |
2046 | int i, cnt = 0; | |
2047 | ||
2048 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
2049 | if (ap->device[i].class == ATA_DEV_UNKNOWN) | |
2050 | cnt++; | |
2051 | return cnt; | |
2052 | } | |
2053 | ||
2054 | static int ata_eh_skip_recovery(struct ata_port *ap) | |
2055 | { | |
2056 | struct ata_eh_context *ehc = &ap->eh_context; | |
2057 | int i; | |
2058 | ||
7c8c2cff TH |
2059 | /* thaw frozen port, resume link and recover failed devices */ |
2060 | if ((ap->pflags & ATA_PFLAG_FROZEN) || | |
2061 | (ehc->i.flags & ATA_EHI_RESUME_LINK) || ata_port_nr_enabled(ap)) | |
084fe639 TH |
2062 | return 0; |
2063 | ||
2064 | /* skip if class codes for all vacant slots are ATA_DEV_NONE */ | |
2065 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
2066 | struct ata_device *dev = &ap->device[i]; | |
2067 | ||
2068 | if (dev->class == ATA_DEV_UNKNOWN && | |
2069 | ehc->classes[dev->devno] != ATA_DEV_NONE) | |
2070 | return 0; | |
2071 | } | |
2072 | ||
2073 | return 1; | |
2074 | } | |
2075 | ||
fee7ca72 TH |
2076 | static void ata_eh_handle_dev_fail(struct ata_device *dev, int err) |
2077 | { | |
2078 | struct ata_port *ap = dev->ap; | |
2079 | struct ata_eh_context *ehc = &ap->eh_context; | |
2080 | ||
2081 | ehc->tries[dev->devno]--; | |
2082 | ||
2083 | switch (err) { | |
2084 | case -ENODEV: | |
2085 | /* device missing or wrong IDENTIFY data, schedule probing */ | |
2086 | ehc->i.probe_mask |= (1 << dev->devno); | |
2087 | case -EINVAL: | |
2088 | /* give it just one more chance */ | |
2089 | ehc->tries[dev->devno] = min(ehc->tries[dev->devno], 1); | |
2090 | case -EIO: | |
2091 | if (ehc->tries[dev->devno] == 1) { | |
2092 | /* This is the last chance, better to slow | |
2093 | * down than lose it. | |
2094 | */ | |
2095 | sata_down_spd_limit(ap); | |
2096 | ata_down_xfermask_limit(dev, ATA_DNXFER_PIO); | |
2097 | } | |
2098 | } | |
2099 | ||
2100 | if (ata_dev_enabled(dev) && !ehc->tries[dev->devno]) { | |
2101 | /* disable device if it has used up all its chances */ | |
2102 | ata_dev_disable(dev); | |
2103 | ||
2104 | /* detach if offline */ | |
2105 | if (ata_port_offline(ap)) | |
2106 | ata_eh_detach_dev(dev); | |
2107 | ||
2108 | /* probe if requested */ | |
2109 | if ((ehc->i.probe_mask & (1 << dev->devno)) && | |
2110 | !(ehc->did_probe_mask & (1 << dev->devno))) { | |
2111 | ata_eh_detach_dev(dev); | |
2112 | ata_dev_init(dev); | |
2113 | ||
2114 | ehc->tries[dev->devno] = ATA_EH_DEV_TRIES; | |
2115 | ehc->did_probe_mask |= (1 << dev->devno); | |
2116 | ehc->i.action |= ATA_EH_SOFTRESET; | |
2117 | } | |
2118 | } else { | |
2119 | /* soft didn't work? be haaaaard */ | |
2120 | if (ehc->i.flags & ATA_EHI_DID_RESET) | |
2121 | ehc->i.action |= ATA_EH_HARDRESET; | |
2122 | else | |
2123 | ehc->i.action |= ATA_EH_SOFTRESET; | |
2124 | } | |
2125 | } | |
2126 | ||
022bdb07 TH |
2127 | /** |
2128 | * ata_eh_recover - recover host port after error | |
2129 | * @ap: host port to recover | |
f5914a46 | 2130 | * @prereset: prereset method (can be NULL) |
022bdb07 TH |
2131 | * @softreset: softreset method (can be NULL) |
2132 | * @hardreset: hardreset method (can be NULL) | |
2133 | * @postreset: postreset method (can be NULL) | |
2134 | * | |
2135 | * This is the alpha and omega, eum and yang, heart and soul of | |
2136 | * libata exception handling. On entry, actions required to | |
084fe639 TH |
2137 | * recover the port and hotplug requests are recorded in |
2138 | * eh_context. This function executes all the operations with | |
2139 | * appropriate retrials and fallbacks to resurrect failed | |
2140 | * devices, detach goners and greet newcomers. | |
022bdb07 TH |
2141 | * |
2142 | * LOCKING: | |
2143 | * Kernel thread context (may sleep). | |
2144 | * | |
2145 | * RETURNS: | |
2146 | * 0 on success, -errno on failure. | |
2147 | */ | |
f5914a46 TH |
2148 | static int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset, |
2149 | ata_reset_fn_t softreset, ata_reset_fn_t hardreset, | |
022bdb07 TH |
2150 | ata_postreset_fn_t postreset) |
2151 | { | |
2152 | struct ata_eh_context *ehc = &ap->eh_context; | |
2153 | struct ata_device *dev; | |
4ae72a1e | 2154 | int i, rc; |
022bdb07 TH |
2155 | |
2156 | DPRINTK("ENTER\n"); | |
2157 | ||
2158 | /* prep for recovery */ | |
2159 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
2160 | dev = &ap->device[i]; | |
2161 | ||
2162 | ehc->tries[dev->devno] = ATA_EH_DEV_TRIES; | |
084fe639 | 2163 | |
79a55b72 TH |
2164 | /* collect port action mask recorded in dev actions */ |
2165 | ehc->i.action |= ehc->i.dev_action[i] & ~ATA_EH_PERDEV_MASK; | |
2166 | ehc->i.dev_action[i] &= ATA_EH_PERDEV_MASK; | |
2167 | ||
084fe639 TH |
2168 | /* process hotplug request */ |
2169 | if (dev->flags & ATA_DFLAG_DETACH) | |
2170 | ata_eh_detach_dev(dev); | |
2171 | ||
2172 | if (!ata_dev_enabled(dev) && | |
2173 | ((ehc->i.probe_mask & (1 << dev->devno)) && | |
2174 | !(ehc->did_probe_mask & (1 << dev->devno)))) { | |
2175 | ata_eh_detach_dev(dev); | |
2176 | ata_dev_init(dev); | |
2177 | ehc->did_probe_mask |= (1 << dev->devno); | |
2178 | ehc->i.action |= ATA_EH_SOFTRESET; | |
2179 | } | |
022bdb07 TH |
2180 | } |
2181 | ||
2182 | retry: | |
022bdb07 TH |
2183 | rc = 0; |
2184 | ||
aeb2ecd6 | 2185 | /* if UNLOADING, finish immediately */ |
b51e9e5d | 2186 | if (ap->pflags & ATA_PFLAG_UNLOADING) |
aeb2ecd6 TH |
2187 | goto out; |
2188 | ||
022bdb07 | 2189 | /* skip EH if possible. */ |
084fe639 | 2190 | if (ata_eh_skip_recovery(ap)) |
022bdb07 TH |
2191 | ehc->i.action = 0; |
2192 | ||
084fe639 TH |
2193 | for (i = 0; i < ATA_MAX_DEVICES; i++) |
2194 | ehc->classes[i] = ATA_DEV_UNKNOWN; | |
2195 | ||
022bdb07 TH |
2196 | /* reset */ |
2197 | if (ehc->i.action & ATA_EH_RESET_MASK) { | |
2198 | ata_eh_freeze_port(ap); | |
2199 | ||
084fe639 TH |
2200 | rc = ata_eh_reset(ap, ata_port_nr_vacant(ap), prereset, |
2201 | softreset, hardreset, postreset); | |
022bdb07 TH |
2202 | if (rc) { |
2203 | ata_port_printk(ap, KERN_ERR, | |
2204 | "reset failed, giving up\n"); | |
2205 | goto out; | |
2206 | } | |
2207 | ||
2208 | ata_eh_thaw_port(ap); | |
2209 | } | |
2210 | ||
084fe639 TH |
2211 | /* revalidate existing devices and attach new ones */ |
2212 | rc = ata_eh_revalidate_and_attach(ap, &dev); | |
022bdb07 TH |
2213 | if (rc) |
2214 | goto dev_fail; | |
2215 | ||
baa1e78a TH |
2216 | /* configure transfer mode if necessary */ |
2217 | if (ehc->i.flags & ATA_EHI_SETMODE) { | |
022bdb07 | 2218 | rc = ata_set_mode(ap, &dev); |
4ae72a1e | 2219 | if (rc) |
022bdb07 | 2220 | goto dev_fail; |
baa1e78a | 2221 | ehc->i.flags &= ~ATA_EHI_SETMODE; |
022bdb07 TH |
2222 | } |
2223 | ||
2224 | goto out; | |
2225 | ||
2226 | dev_fail: | |
fee7ca72 | 2227 | ata_eh_handle_dev_fail(dev, rc); |
022bdb07 TH |
2228 | |
2229 | if (ata_port_nr_enabled(ap)) { | |
2230 | ata_port_printk(ap, KERN_WARNING, "failed to recover some " | |
2231 | "devices, retrying in 5 secs\n"); | |
2232 | ssleep(5); | |
2233 | } else { | |
2234 | /* no device left, repeat fast */ | |
2235 | msleep(500); | |
2236 | } | |
2237 | ||
2238 | goto retry; | |
2239 | ||
2240 | out: | |
2241 | if (rc) { | |
2242 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
2243 | ata_dev_disable(&ap->device[i]); | |
2244 | } | |
2245 | ||
2246 | DPRINTK("EXIT, rc=%d\n", rc); | |
2247 | return rc; | |
2248 | } | |
2249 | ||
2250 | /** | |
2251 | * ata_eh_finish - finish up EH | |
2252 | * @ap: host port to finish EH for | |
2253 | * | |
2254 | * Recovery is complete. Clean up EH states and retry or finish | |
2255 | * failed qcs. | |
2256 | * | |
2257 | * LOCKING: | |
2258 | * None. | |
2259 | */ | |
2260 | static void ata_eh_finish(struct ata_port *ap) | |
2261 | { | |
2262 | int tag; | |
2263 | ||
2264 | /* retry or finish qcs */ | |
2265 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
2266 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
2267 | ||
2268 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
2269 | continue; | |
2270 | ||
2271 | if (qc->err_mask) { | |
2272 | /* FIXME: Once EH migration is complete, | |
2273 | * generate sense data in this function, | |
2274 | * considering both err_mask and tf. | |
2275 | */ | |
2276 | if (qc->err_mask & AC_ERR_INVALID) | |
2277 | ata_eh_qc_complete(qc); | |
2278 | else | |
2279 | ata_eh_qc_retry(qc); | |
2280 | } else { | |
2281 | if (qc->flags & ATA_QCFLAG_SENSE_VALID) { | |
2282 | ata_eh_qc_complete(qc); | |
2283 | } else { | |
2284 | /* feed zero TF to sense generation */ | |
2285 | memset(&qc->result_tf, 0, sizeof(qc->result_tf)); | |
2286 | ata_eh_qc_retry(qc); | |
2287 | } | |
2288 | } | |
2289 | } | |
2290 | } | |
2291 | ||
2292 | /** | |
2293 | * ata_do_eh - do standard error handling | |
2294 | * @ap: host port to handle error for | |
f5914a46 | 2295 | * @prereset: prereset method (can be NULL) |
022bdb07 TH |
2296 | * @softreset: softreset method (can be NULL) |
2297 | * @hardreset: hardreset method (can be NULL) | |
2298 | * @postreset: postreset method (can be NULL) | |
2299 | * | |
2300 | * Perform standard error handling sequence. | |
2301 | * | |
2302 | * LOCKING: | |
2303 | * Kernel thread context (may sleep). | |
2304 | */ | |
f5914a46 TH |
2305 | void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset, |
2306 | ata_reset_fn_t softreset, ata_reset_fn_t hardreset, | |
2307 | ata_postreset_fn_t postreset) | |
022bdb07 | 2308 | { |
1cdaf534 TH |
2309 | ata_eh_autopsy(ap); |
2310 | ata_eh_report(ap); | |
f5914a46 | 2311 | ata_eh_recover(ap, prereset, softreset, hardreset, postreset); |
022bdb07 TH |
2312 | ata_eh_finish(ap); |
2313 | } | |
500530f6 | 2314 | |
6ffa01d8 | 2315 | #ifdef CONFIG_PM |
500530f6 TH |
2316 | /** |
2317 | * ata_eh_handle_port_suspend - perform port suspend operation | |
2318 | * @ap: port to suspend | |
2319 | * | |
2320 | * Suspend @ap. | |
2321 | * | |
2322 | * LOCKING: | |
2323 | * Kernel thread context (may sleep). | |
2324 | */ | |
2325 | static void ata_eh_handle_port_suspend(struct ata_port *ap) | |
2326 | { | |
2327 | unsigned long flags; | |
2328 | int rc = 0; | |
2329 | ||
2330 | /* are we suspending? */ | |
2331 | spin_lock_irqsave(ap->lock, flags); | |
2332 | if (!(ap->pflags & ATA_PFLAG_PM_PENDING) || | |
2333 | ap->pm_mesg.event == PM_EVENT_ON) { | |
2334 | spin_unlock_irqrestore(ap->lock, flags); | |
2335 | return; | |
2336 | } | |
2337 | spin_unlock_irqrestore(ap->lock, flags); | |
2338 | ||
2339 | WARN_ON(ap->pflags & ATA_PFLAG_SUSPENDED); | |
2340 | ||
64578a3d TH |
2341 | /* tell ACPI we're suspending */ |
2342 | rc = ata_acpi_on_suspend(ap); | |
2343 | if (rc) | |
2344 | goto out; | |
2345 | ||
500530f6 TH |
2346 | /* suspend */ |
2347 | ata_eh_freeze_port(ap); | |
2348 | ||
2349 | if (ap->ops->port_suspend) | |
2350 | rc = ap->ops->port_suspend(ap, ap->pm_mesg); | |
2351 | ||
64578a3d | 2352 | out: |
500530f6 TH |
2353 | /* report result */ |
2354 | spin_lock_irqsave(ap->lock, flags); | |
2355 | ||
2356 | ap->pflags &= ~ATA_PFLAG_PM_PENDING; | |
2357 | if (rc == 0) | |
2358 | ap->pflags |= ATA_PFLAG_SUSPENDED; | |
64578a3d | 2359 | else if (ap->pflags & ATA_PFLAG_FROZEN) |
500530f6 TH |
2360 | ata_port_schedule_eh(ap); |
2361 | ||
2362 | if (ap->pm_result) { | |
2363 | *ap->pm_result = rc; | |
2364 | ap->pm_result = NULL; | |
2365 | } | |
2366 | ||
2367 | spin_unlock_irqrestore(ap->lock, flags); | |
2368 | ||
2369 | return; | |
2370 | } | |
2371 | ||
2372 | /** | |
2373 | * ata_eh_handle_port_resume - perform port resume operation | |
2374 | * @ap: port to resume | |
2375 | * | |
2376 | * Resume @ap. | |
2377 | * | |
500530f6 TH |
2378 | * LOCKING: |
2379 | * Kernel thread context (may sleep). | |
2380 | */ | |
2381 | static void ata_eh_handle_port_resume(struct ata_port *ap) | |
2382 | { | |
500530f6 | 2383 | unsigned long flags; |
9666f400 | 2384 | int rc = 0; |
500530f6 TH |
2385 | |
2386 | /* are we resuming? */ | |
2387 | spin_lock_irqsave(ap->lock, flags); | |
2388 | if (!(ap->pflags & ATA_PFLAG_PM_PENDING) || | |
2389 | ap->pm_mesg.event != PM_EVENT_ON) { | |
2390 | spin_unlock_irqrestore(ap->lock, flags); | |
2391 | return; | |
2392 | } | |
2393 | spin_unlock_irqrestore(ap->lock, flags); | |
2394 | ||
9666f400 | 2395 | WARN_ON(!(ap->pflags & ATA_PFLAG_SUSPENDED)); |
500530f6 TH |
2396 | |
2397 | if (ap->ops->port_resume) | |
2398 | rc = ap->ops->port_resume(ap); | |
2399 | ||
6746544c TH |
2400 | /* tell ACPI that we're resuming */ |
2401 | ata_acpi_on_resume(ap); | |
2402 | ||
9666f400 | 2403 | /* report result */ |
500530f6 TH |
2404 | spin_lock_irqsave(ap->lock, flags); |
2405 | ap->pflags &= ~(ATA_PFLAG_PM_PENDING | ATA_PFLAG_SUSPENDED); | |
2406 | if (ap->pm_result) { | |
2407 | *ap->pm_result = rc; | |
2408 | ap->pm_result = NULL; | |
2409 | } | |
2410 | spin_unlock_irqrestore(ap->lock, flags); | |
2411 | } | |
6ffa01d8 | 2412 | #endif /* CONFIG_PM */ |