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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 | ||
ad9e2762 | 53 | static void __ata_port_freeze(struct ata_port *ap); |
720ba126 | 54 | static void ata_eh_finish(struct ata_port *ap); |
500530f6 TH |
55 | static void ata_eh_handle_port_suspend(struct ata_port *ap); |
56 | static void ata_eh_handle_port_resume(struct ata_port *ap); | |
ad9e2762 | 57 | |
0c247c55 TH |
58 | static void ata_ering_record(struct ata_ering *ering, int is_io, |
59 | unsigned int err_mask) | |
60 | { | |
61 | struct ata_ering_entry *ent; | |
62 | ||
63 | WARN_ON(!err_mask); | |
64 | ||
65 | ering->cursor++; | |
66 | ering->cursor %= ATA_ERING_SIZE; | |
67 | ||
68 | ent = &ering->ring[ering->cursor]; | |
69 | ent->is_io = is_io; | |
70 | ent->err_mask = err_mask; | |
71 | ent->timestamp = get_jiffies_64(); | |
72 | } | |
73 | ||
7d47e8d4 | 74 | static void ata_ering_clear(struct ata_ering *ering) |
0c247c55 | 75 | { |
7d47e8d4 | 76 | memset(ering, 0, sizeof(*ering)); |
0c247c55 TH |
77 | } |
78 | ||
79 | static int ata_ering_map(struct ata_ering *ering, | |
80 | int (*map_fn)(struct ata_ering_entry *, void *), | |
81 | void *arg) | |
82 | { | |
83 | int idx, rc = 0; | |
84 | struct ata_ering_entry *ent; | |
85 | ||
86 | idx = ering->cursor; | |
87 | do { | |
88 | ent = &ering->ring[idx]; | |
89 | if (!ent->err_mask) | |
90 | break; | |
91 | rc = map_fn(ent, arg); | |
92 | if (rc) | |
93 | break; | |
94 | idx = (idx - 1 + ATA_ERING_SIZE) % ATA_ERING_SIZE; | |
95 | } while (idx != ering->cursor); | |
96 | ||
97 | return rc; | |
98 | } | |
99 | ||
64f65ca6 TH |
100 | static unsigned int ata_eh_dev_action(struct ata_device *dev) |
101 | { | |
102 | struct ata_eh_context *ehc = &dev->ap->eh_context; | |
103 | ||
104 | return ehc->i.action | ehc->i.dev_action[dev->devno]; | |
105 | } | |
106 | ||
af181c2d TH |
107 | static void ata_eh_clear_action(struct ata_device *dev, |
108 | struct ata_eh_info *ehi, unsigned int action) | |
109 | { | |
110 | int i; | |
111 | ||
112 | if (!dev) { | |
113 | ehi->action &= ~action; | |
114 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
115 | ehi->dev_action[i] &= ~action; | |
116 | } else { | |
117 | /* doesn't make sense for port-wide EH actions */ | |
118 | WARN_ON(!(action & ATA_EH_PERDEV_MASK)); | |
119 | ||
120 | /* break ehi->action into ehi->dev_action */ | |
121 | if (ehi->action & action) { | |
122 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
123 | ehi->dev_action[i] |= ehi->action & action; | |
124 | ehi->action &= ~action; | |
125 | } | |
126 | ||
127 | /* turn off the specified per-dev action */ | |
128 | ehi->dev_action[dev->devno] &= ~action; | |
129 | } | |
130 | } | |
131 | ||
ece1d636 TH |
132 | /** |
133 | * ata_scsi_timed_out - SCSI layer time out callback | |
134 | * @cmd: timed out SCSI command | |
135 | * | |
136 | * Handles SCSI layer timeout. We race with normal completion of | |
137 | * the qc for @cmd. If the qc is already gone, we lose and let | |
138 | * the scsi command finish (EH_HANDLED). Otherwise, the qc has | |
139 | * timed out and EH should be invoked. Prevent ata_qc_complete() | |
140 | * from finishing it by setting EH_SCHEDULED and return | |
141 | * EH_NOT_HANDLED. | |
142 | * | |
ad9e2762 TH |
143 | * TODO: kill this function once old EH is gone. |
144 | * | |
ece1d636 TH |
145 | * LOCKING: |
146 | * Called from timer context | |
147 | * | |
148 | * RETURNS: | |
149 | * EH_HANDLED or EH_NOT_HANDLED | |
150 | */ | |
151 | enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd) | |
152 | { | |
153 | struct Scsi_Host *host = cmd->device->host; | |
35bb94b1 | 154 | struct ata_port *ap = ata_shost_to_port(host); |
ece1d636 TH |
155 | unsigned long flags; |
156 | struct ata_queued_cmd *qc; | |
ad9e2762 | 157 | enum scsi_eh_timer_return ret; |
ece1d636 TH |
158 | |
159 | DPRINTK("ENTER\n"); | |
160 | ||
ad9e2762 TH |
161 | if (ap->ops->error_handler) { |
162 | ret = EH_NOT_HANDLED; | |
163 | goto out; | |
164 | } | |
165 | ||
166 | ret = EH_HANDLED; | |
ba6a1308 | 167 | spin_lock_irqsave(ap->lock, flags); |
ece1d636 TH |
168 | qc = ata_qc_from_tag(ap, ap->active_tag); |
169 | if (qc) { | |
170 | WARN_ON(qc->scsicmd != cmd); | |
171 | qc->flags |= ATA_QCFLAG_EH_SCHEDULED; | |
172 | qc->err_mask |= AC_ERR_TIMEOUT; | |
173 | ret = EH_NOT_HANDLED; | |
174 | } | |
ba6a1308 | 175 | spin_unlock_irqrestore(ap->lock, flags); |
ece1d636 | 176 | |
ad9e2762 | 177 | out: |
ece1d636 TH |
178 | DPRINTK("EXIT, ret=%d\n", ret); |
179 | return ret; | |
180 | } | |
181 | ||
182 | /** | |
183 | * ata_scsi_error - SCSI layer error handler callback | |
184 | * @host: SCSI host on which error occurred | |
185 | * | |
186 | * Handles SCSI-layer-thrown error events. | |
187 | * | |
188 | * LOCKING: | |
189 | * Inherited from SCSI layer (none, can sleep) | |
190 | * | |
191 | * RETURNS: | |
192 | * Zero. | |
193 | */ | |
381544bb | 194 | void ata_scsi_error(struct Scsi_Host *host) |
ece1d636 | 195 | { |
35bb94b1 | 196 | struct ata_port *ap = ata_shost_to_port(host); |
ad9e2762 TH |
197 | int i, repeat_cnt = ATA_EH_MAX_REPEAT; |
198 | unsigned long flags; | |
ece1d636 TH |
199 | |
200 | DPRINTK("ENTER\n"); | |
201 | ||
ad9e2762 | 202 | /* synchronize with port task */ |
ece1d636 TH |
203 | ata_port_flush_task(ap); |
204 | ||
cca3974e | 205 | /* synchronize with host lock and sort out timeouts */ |
ad9e2762 TH |
206 | |
207 | /* For new EH, all qcs are finished in one of three ways - | |
208 | * normal completion, error completion, and SCSI timeout. | |
209 | * Both cmpletions can race against SCSI timeout. When normal | |
210 | * completion wins, the qc never reaches EH. When error | |
211 | * completion wins, the qc has ATA_QCFLAG_FAILED set. | |
212 | * | |
213 | * When SCSI timeout wins, things are a bit more complex. | |
214 | * Normal or error completion can occur after the timeout but | |
215 | * before this point. In such cases, both types of | |
216 | * completions are honored. A scmd is determined to have | |
217 | * timed out iff its associated qc is active and not failed. | |
218 | */ | |
219 | if (ap->ops->error_handler) { | |
220 | struct scsi_cmnd *scmd, *tmp; | |
221 | int nr_timedout = 0; | |
222 | ||
e30349d2 | 223 | spin_lock_irqsave(ap->lock, flags); |
ad9e2762 TH |
224 | |
225 | list_for_each_entry_safe(scmd, tmp, &host->eh_cmd_q, eh_entry) { | |
226 | struct ata_queued_cmd *qc; | |
227 | ||
228 | for (i = 0; i < ATA_MAX_QUEUE; i++) { | |
229 | qc = __ata_qc_from_tag(ap, i); | |
230 | if (qc->flags & ATA_QCFLAG_ACTIVE && | |
231 | qc->scsicmd == scmd) | |
232 | break; | |
233 | } | |
234 | ||
235 | if (i < ATA_MAX_QUEUE) { | |
236 | /* the scmd has an associated qc */ | |
237 | if (!(qc->flags & ATA_QCFLAG_FAILED)) { | |
238 | /* which hasn't failed yet, timeout */ | |
239 | qc->err_mask |= AC_ERR_TIMEOUT; | |
240 | qc->flags |= ATA_QCFLAG_FAILED; | |
241 | nr_timedout++; | |
242 | } | |
243 | } else { | |
244 | /* Normal completion occurred after | |
245 | * SCSI timeout but before this point. | |
246 | * Successfully complete it. | |
247 | */ | |
248 | scmd->retries = scmd->allowed; | |
249 | scsi_eh_finish_cmd(scmd, &ap->eh_done_q); | |
250 | } | |
251 | } | |
252 | ||
253 | /* If we have timed out qcs. They belong to EH from | |
254 | * this point but the state of the controller is | |
255 | * unknown. Freeze the port to make sure the IRQ | |
256 | * handler doesn't diddle with those qcs. This must | |
257 | * be done atomically w.r.t. setting QCFLAG_FAILED. | |
258 | */ | |
259 | if (nr_timedout) | |
260 | __ata_port_freeze(ap); | |
261 | ||
e30349d2 | 262 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 | 263 | } else |
e30349d2 | 264 | spin_unlock_wait(ap->lock); |
ad9e2762 TH |
265 | |
266 | repeat: | |
267 | /* invoke error handler */ | |
268 | if (ap->ops->error_handler) { | |
500530f6 TH |
269 | /* process port resume request */ |
270 | ata_eh_handle_port_resume(ap); | |
271 | ||
f3e81b19 | 272 | /* fetch & clear EH info */ |
e30349d2 | 273 | spin_lock_irqsave(ap->lock, flags); |
f3e81b19 TH |
274 | |
275 | memset(&ap->eh_context, 0, sizeof(ap->eh_context)); | |
276 | ap->eh_context.i = ap->eh_info; | |
277 | memset(&ap->eh_info, 0, sizeof(ap->eh_info)); | |
278 | ||
b51e9e5d TH |
279 | ap->pflags |= ATA_PFLAG_EH_IN_PROGRESS; |
280 | ap->pflags &= ~ATA_PFLAG_EH_PENDING; | |
f3e81b19 | 281 | |
e30349d2 | 282 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 | 283 | |
500530f6 TH |
284 | /* invoke EH, skip if unloading or suspended */ |
285 | if (!(ap->pflags & (ATA_PFLAG_UNLOADING | ATA_PFLAG_SUSPENDED))) | |
720ba126 TH |
286 | ap->ops->error_handler(ap); |
287 | else | |
288 | ata_eh_finish(ap); | |
ad9e2762 | 289 | |
500530f6 TH |
290 | /* process port suspend request */ |
291 | ata_eh_handle_port_suspend(ap); | |
292 | ||
ad9e2762 TH |
293 | /* Exception might have happend after ->error_handler |
294 | * recovered the port but before this point. Repeat | |
295 | * EH in such case. | |
296 | */ | |
e30349d2 | 297 | spin_lock_irqsave(ap->lock, flags); |
ad9e2762 | 298 | |
b51e9e5d | 299 | if (ap->pflags & ATA_PFLAG_EH_PENDING) { |
ad9e2762 TH |
300 | if (--repeat_cnt) { |
301 | ata_port_printk(ap, KERN_INFO, | |
302 | "EH pending after completion, " | |
303 | "repeating EH (cnt=%d)\n", repeat_cnt); | |
e30349d2 | 304 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 TH |
305 | goto repeat; |
306 | } | |
307 | ata_port_printk(ap, KERN_ERR, "EH pending after %d " | |
308 | "tries, giving up\n", ATA_EH_MAX_REPEAT); | |
309 | } | |
310 | ||
f3e81b19 TH |
311 | /* this run is complete, make sure EH info is clear */ |
312 | memset(&ap->eh_info, 0, sizeof(ap->eh_info)); | |
313 | ||
e30349d2 | 314 | /* Clear host_eh_scheduled while holding ap->lock such |
ad9e2762 TH |
315 | * that if exception occurs after this point but |
316 | * before EH completion, SCSI midlayer will | |
317 | * re-initiate EH. | |
318 | */ | |
319 | host->host_eh_scheduled = 0; | |
320 | ||
e30349d2 | 321 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 TH |
322 | } else { |
323 | WARN_ON(ata_qc_from_tag(ap, ap->active_tag) == NULL); | |
324 | ap->ops->eng_timeout(ap); | |
325 | } | |
ece1d636 | 326 | |
ad9e2762 | 327 | /* finish or retry handled scmd's and clean up */ |
ece1d636 TH |
328 | WARN_ON(host->host_failed || !list_empty(&host->eh_cmd_q)); |
329 | ||
330 | scsi_eh_flush_done_q(&ap->eh_done_q); | |
331 | ||
ad9e2762 | 332 | /* clean up */ |
e30349d2 | 333 | spin_lock_irqsave(ap->lock, flags); |
ad9e2762 | 334 | |
1cdaf534 | 335 | if (ap->pflags & ATA_PFLAG_LOADING) |
b51e9e5d | 336 | ap->pflags &= ~ATA_PFLAG_LOADING; |
1cdaf534 | 337 | else if (ap->pflags & ATA_PFLAG_SCSI_HOTPLUG) |
52bad64d | 338 | queue_delayed_work(ata_aux_wq, &ap->hotplug_task, 0); |
1cdaf534 TH |
339 | |
340 | if (ap->pflags & ATA_PFLAG_RECOVERED) | |
341 | ata_port_printk(ap, KERN_INFO, "EH complete\n"); | |
580b2102 | 342 | |
b51e9e5d | 343 | ap->pflags &= ~(ATA_PFLAG_SCSI_HOTPLUG | ATA_PFLAG_RECOVERED); |
ad9e2762 | 344 | |
c6cf9e99 | 345 | /* tell wait_eh that we're done */ |
b51e9e5d | 346 | ap->pflags &= ~ATA_PFLAG_EH_IN_PROGRESS; |
c6cf9e99 TH |
347 | wake_up_all(&ap->eh_wait_q); |
348 | ||
e30349d2 | 349 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 | 350 | |
ece1d636 | 351 | DPRINTK("EXIT\n"); |
ece1d636 TH |
352 | } |
353 | ||
c6cf9e99 TH |
354 | /** |
355 | * ata_port_wait_eh - Wait for the currently pending EH to complete | |
356 | * @ap: Port to wait EH for | |
357 | * | |
358 | * Wait until the currently pending EH is complete. | |
359 | * | |
360 | * LOCKING: | |
361 | * Kernel thread context (may sleep). | |
362 | */ | |
363 | void ata_port_wait_eh(struct ata_port *ap) | |
364 | { | |
365 | unsigned long flags; | |
366 | DEFINE_WAIT(wait); | |
367 | ||
368 | retry: | |
ba6a1308 | 369 | spin_lock_irqsave(ap->lock, flags); |
c6cf9e99 | 370 | |
b51e9e5d | 371 | while (ap->pflags & (ATA_PFLAG_EH_PENDING | ATA_PFLAG_EH_IN_PROGRESS)) { |
c6cf9e99 | 372 | prepare_to_wait(&ap->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE); |
ba6a1308 | 373 | spin_unlock_irqrestore(ap->lock, flags); |
c6cf9e99 | 374 | schedule(); |
ba6a1308 | 375 | spin_lock_irqsave(ap->lock, flags); |
c6cf9e99 | 376 | } |
0a1b622e | 377 | finish_wait(&ap->eh_wait_q, &wait); |
c6cf9e99 | 378 | |
ba6a1308 | 379 | spin_unlock_irqrestore(ap->lock, flags); |
c6cf9e99 TH |
380 | |
381 | /* make sure SCSI EH is complete */ | |
cca3974e | 382 | if (scsi_host_in_recovery(ap->scsi_host)) { |
c6cf9e99 TH |
383 | msleep(10); |
384 | goto retry; | |
385 | } | |
386 | } | |
387 | ||
ece1d636 TH |
388 | /** |
389 | * ata_qc_timeout - Handle timeout of queued command | |
390 | * @qc: Command that timed out | |
391 | * | |
392 | * Some part of the kernel (currently, only the SCSI layer) | |
393 | * has noticed that the active command on port @ap has not | |
394 | * completed after a specified length of time. Handle this | |
395 | * condition by disabling DMA (if necessary) and completing | |
396 | * transactions, with error if necessary. | |
397 | * | |
398 | * This also handles the case of the "lost interrupt", where | |
399 | * for some reason (possibly hardware bug, possibly driver bug) | |
400 | * an interrupt was not delivered to the driver, even though the | |
401 | * transaction completed successfully. | |
402 | * | |
ad9e2762 TH |
403 | * TODO: kill this function once old EH is gone. |
404 | * | |
ece1d636 TH |
405 | * LOCKING: |
406 | * Inherited from SCSI layer (none, can sleep) | |
407 | */ | |
408 | static void ata_qc_timeout(struct ata_queued_cmd *qc) | |
409 | { | |
410 | struct ata_port *ap = qc->ap; | |
ece1d636 TH |
411 | u8 host_stat = 0, drv_stat; |
412 | unsigned long flags; | |
413 | ||
414 | DPRINTK("ENTER\n"); | |
415 | ||
416 | ap->hsm_task_state = HSM_ST_IDLE; | |
417 | ||
ba6a1308 | 418 | spin_lock_irqsave(ap->lock, flags); |
ece1d636 TH |
419 | |
420 | switch (qc->tf.protocol) { | |
421 | ||
422 | case ATA_PROT_DMA: | |
423 | case ATA_PROT_ATAPI_DMA: | |
424 | host_stat = ap->ops->bmdma_status(ap); | |
425 | ||
426 | /* before we do anything else, clear DMA-Start bit */ | |
427 | ap->ops->bmdma_stop(qc); | |
428 | ||
429 | /* fall through */ | |
430 | ||
431 | default: | |
432 | ata_altstatus(ap); | |
433 | drv_stat = ata_chk_status(ap); | |
434 | ||
435 | /* ack bmdma irq events */ | |
436 | ap->ops->irq_clear(ap); | |
437 | ||
f15a1daf TH |
438 | ata_dev_printk(qc->dev, KERN_ERR, "command 0x%x timeout, " |
439 | "stat 0x%x host_stat 0x%x\n", | |
440 | qc->tf.command, drv_stat, host_stat); | |
ece1d636 TH |
441 | |
442 | /* complete taskfile transaction */ | |
c13b56a1 | 443 | qc->err_mask |= AC_ERR_TIMEOUT; |
ece1d636 TH |
444 | break; |
445 | } | |
446 | ||
ba6a1308 | 447 | spin_unlock_irqrestore(ap->lock, flags); |
ece1d636 TH |
448 | |
449 | ata_eh_qc_complete(qc); | |
450 | ||
451 | DPRINTK("EXIT\n"); | |
452 | } | |
453 | ||
454 | /** | |
455 | * ata_eng_timeout - Handle timeout of queued command | |
456 | * @ap: Port on which timed-out command is active | |
457 | * | |
458 | * Some part of the kernel (currently, only the SCSI layer) | |
459 | * has noticed that the active command on port @ap has not | |
460 | * completed after a specified length of time. Handle this | |
461 | * condition by disabling DMA (if necessary) and completing | |
462 | * transactions, with error if necessary. | |
463 | * | |
464 | * This also handles the case of the "lost interrupt", where | |
465 | * for some reason (possibly hardware bug, possibly driver bug) | |
466 | * an interrupt was not delivered to the driver, even though the | |
467 | * transaction completed successfully. | |
468 | * | |
ad9e2762 TH |
469 | * TODO: kill this function once old EH is gone. |
470 | * | |
ece1d636 TH |
471 | * LOCKING: |
472 | * Inherited from SCSI layer (none, can sleep) | |
473 | */ | |
474 | void ata_eng_timeout(struct ata_port *ap) | |
475 | { | |
476 | DPRINTK("ENTER\n"); | |
477 | ||
478 | ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag)); | |
479 | ||
480 | DPRINTK("EXIT\n"); | |
481 | } | |
482 | ||
f686bcb8 TH |
483 | /** |
484 | * ata_qc_schedule_eh - schedule qc for error handling | |
485 | * @qc: command to schedule error handling for | |
486 | * | |
487 | * Schedule error handling for @qc. EH will kick in as soon as | |
488 | * other commands are drained. | |
489 | * | |
490 | * LOCKING: | |
cca3974e | 491 | * spin_lock_irqsave(host lock) |
f686bcb8 TH |
492 | */ |
493 | void ata_qc_schedule_eh(struct ata_queued_cmd *qc) | |
494 | { | |
495 | struct ata_port *ap = qc->ap; | |
496 | ||
497 | WARN_ON(!ap->ops->error_handler); | |
498 | ||
499 | qc->flags |= ATA_QCFLAG_FAILED; | |
b51e9e5d | 500 | qc->ap->pflags |= ATA_PFLAG_EH_PENDING; |
f686bcb8 TH |
501 | |
502 | /* The following will fail if timeout has already expired. | |
503 | * ata_scsi_error() takes care of such scmds on EH entry. | |
504 | * Note that ATA_QCFLAG_FAILED is unconditionally set after | |
505 | * this function completes. | |
506 | */ | |
507 | scsi_req_abort_cmd(qc->scsicmd); | |
508 | } | |
509 | ||
7b70fc03 TH |
510 | /** |
511 | * ata_port_schedule_eh - schedule error handling without a qc | |
512 | * @ap: ATA port to schedule EH for | |
513 | * | |
514 | * Schedule error handling for @ap. EH will kick in as soon as | |
515 | * all commands are drained. | |
516 | * | |
517 | * LOCKING: | |
cca3974e | 518 | * spin_lock_irqsave(host lock) |
7b70fc03 TH |
519 | */ |
520 | void ata_port_schedule_eh(struct ata_port *ap) | |
521 | { | |
522 | WARN_ON(!ap->ops->error_handler); | |
523 | ||
b51e9e5d | 524 | ap->pflags |= ATA_PFLAG_EH_PENDING; |
cca3974e | 525 | scsi_schedule_eh(ap->scsi_host); |
7b70fc03 TH |
526 | |
527 | DPRINTK("port EH scheduled\n"); | |
528 | } | |
529 | ||
530 | /** | |
531 | * ata_port_abort - abort all qc's on the port | |
532 | * @ap: ATA port to abort qc's for | |
533 | * | |
534 | * Abort all active qc's of @ap and schedule EH. | |
535 | * | |
536 | * LOCKING: | |
cca3974e | 537 | * spin_lock_irqsave(host lock) |
7b70fc03 TH |
538 | * |
539 | * RETURNS: | |
540 | * Number of aborted qc's. | |
541 | */ | |
542 | int ata_port_abort(struct ata_port *ap) | |
543 | { | |
544 | int tag, nr_aborted = 0; | |
545 | ||
546 | WARN_ON(!ap->ops->error_handler); | |
547 | ||
548 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
549 | struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag); | |
550 | ||
551 | if (qc) { | |
552 | qc->flags |= ATA_QCFLAG_FAILED; | |
553 | ata_qc_complete(qc); | |
554 | nr_aborted++; | |
555 | } | |
556 | } | |
557 | ||
558 | if (!nr_aborted) | |
559 | ata_port_schedule_eh(ap); | |
560 | ||
561 | return nr_aborted; | |
562 | } | |
563 | ||
e3180499 TH |
564 | /** |
565 | * __ata_port_freeze - freeze port | |
566 | * @ap: ATA port to freeze | |
567 | * | |
568 | * This function is called when HSM violation or some other | |
569 | * condition disrupts normal operation of the port. Frozen port | |
570 | * is not allowed to perform any operation until the port is | |
571 | * thawed, which usually follows a successful reset. | |
572 | * | |
573 | * ap->ops->freeze() callback can be used for freezing the port | |
574 | * hardware-wise (e.g. mask interrupt and stop DMA engine). If a | |
575 | * port cannot be frozen hardware-wise, the interrupt handler | |
576 | * must ack and clear interrupts unconditionally while the port | |
577 | * is frozen. | |
578 | * | |
579 | * LOCKING: | |
cca3974e | 580 | * spin_lock_irqsave(host lock) |
e3180499 TH |
581 | */ |
582 | static void __ata_port_freeze(struct ata_port *ap) | |
583 | { | |
584 | WARN_ON(!ap->ops->error_handler); | |
585 | ||
586 | if (ap->ops->freeze) | |
587 | ap->ops->freeze(ap); | |
588 | ||
b51e9e5d | 589 | ap->pflags |= ATA_PFLAG_FROZEN; |
e3180499 | 590 | |
44877b4e | 591 | DPRINTK("ata%u port frozen\n", ap->print_id); |
e3180499 TH |
592 | } |
593 | ||
594 | /** | |
595 | * ata_port_freeze - abort & freeze port | |
596 | * @ap: ATA port to freeze | |
597 | * | |
598 | * Abort and freeze @ap. | |
599 | * | |
600 | * LOCKING: | |
cca3974e | 601 | * spin_lock_irqsave(host lock) |
e3180499 TH |
602 | * |
603 | * RETURNS: | |
604 | * Number of aborted commands. | |
605 | */ | |
606 | int ata_port_freeze(struct ata_port *ap) | |
607 | { | |
608 | int nr_aborted; | |
609 | ||
610 | WARN_ON(!ap->ops->error_handler); | |
611 | ||
612 | nr_aborted = ata_port_abort(ap); | |
613 | __ata_port_freeze(ap); | |
614 | ||
615 | return nr_aborted; | |
616 | } | |
617 | ||
618 | /** | |
619 | * ata_eh_freeze_port - EH helper to freeze port | |
620 | * @ap: ATA port to freeze | |
621 | * | |
622 | * Freeze @ap. | |
623 | * | |
624 | * LOCKING: | |
625 | * None. | |
626 | */ | |
627 | void ata_eh_freeze_port(struct ata_port *ap) | |
628 | { | |
629 | unsigned long flags; | |
630 | ||
631 | if (!ap->ops->error_handler) | |
632 | return; | |
633 | ||
ba6a1308 | 634 | spin_lock_irqsave(ap->lock, flags); |
e3180499 | 635 | __ata_port_freeze(ap); |
ba6a1308 | 636 | spin_unlock_irqrestore(ap->lock, flags); |
e3180499 TH |
637 | } |
638 | ||
639 | /** | |
640 | * ata_port_thaw_port - EH helper to thaw port | |
641 | * @ap: ATA port to thaw | |
642 | * | |
643 | * Thaw frozen port @ap. | |
644 | * | |
645 | * LOCKING: | |
646 | * None. | |
647 | */ | |
648 | void ata_eh_thaw_port(struct ata_port *ap) | |
649 | { | |
650 | unsigned long flags; | |
651 | ||
652 | if (!ap->ops->error_handler) | |
653 | return; | |
654 | ||
ba6a1308 | 655 | spin_lock_irqsave(ap->lock, flags); |
e3180499 | 656 | |
b51e9e5d | 657 | ap->pflags &= ~ATA_PFLAG_FROZEN; |
e3180499 TH |
658 | |
659 | if (ap->ops->thaw) | |
660 | ap->ops->thaw(ap); | |
661 | ||
ba6a1308 | 662 | spin_unlock_irqrestore(ap->lock, flags); |
e3180499 | 663 | |
44877b4e | 664 | DPRINTK("ata%u port thawed\n", ap->print_id); |
e3180499 TH |
665 | } |
666 | ||
ece1d636 TH |
667 | static void ata_eh_scsidone(struct scsi_cmnd *scmd) |
668 | { | |
669 | /* nada */ | |
670 | } | |
671 | ||
672 | static void __ata_eh_qc_complete(struct ata_queued_cmd *qc) | |
673 | { | |
674 | struct ata_port *ap = qc->ap; | |
675 | struct scsi_cmnd *scmd = qc->scsicmd; | |
676 | unsigned long flags; | |
677 | ||
ba6a1308 | 678 | spin_lock_irqsave(ap->lock, flags); |
ece1d636 TH |
679 | qc->scsidone = ata_eh_scsidone; |
680 | __ata_qc_complete(qc); | |
681 | WARN_ON(ata_tag_valid(qc->tag)); | |
ba6a1308 | 682 | spin_unlock_irqrestore(ap->lock, flags); |
ece1d636 TH |
683 | |
684 | scsi_eh_finish_cmd(scmd, &ap->eh_done_q); | |
685 | } | |
686 | ||
687 | /** | |
688 | * ata_eh_qc_complete - Complete an active ATA command from EH | |
689 | * @qc: Command to complete | |
690 | * | |
691 | * Indicate to the mid and upper layers that an ATA command has | |
692 | * completed. To be used from EH. | |
693 | */ | |
694 | void ata_eh_qc_complete(struct ata_queued_cmd *qc) | |
695 | { | |
696 | struct scsi_cmnd *scmd = qc->scsicmd; | |
697 | scmd->retries = scmd->allowed; | |
698 | __ata_eh_qc_complete(qc); | |
699 | } | |
700 | ||
701 | /** | |
702 | * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH | |
703 | * @qc: Command to retry | |
704 | * | |
705 | * Indicate to the mid and upper layers that an ATA command | |
706 | * should be retried. To be used from EH. | |
707 | * | |
708 | * SCSI midlayer limits the number of retries to scmd->allowed. | |
709 | * scmd->retries is decremented for commands which get retried | |
710 | * due to unrelated failures (qc->err_mask is zero). | |
711 | */ | |
712 | void ata_eh_qc_retry(struct ata_queued_cmd *qc) | |
713 | { | |
714 | struct scsi_cmnd *scmd = qc->scsicmd; | |
715 | if (!qc->err_mask && scmd->retries) | |
716 | scmd->retries--; | |
717 | __ata_eh_qc_complete(qc); | |
718 | } | |
022bdb07 | 719 | |
0ea035a3 TH |
720 | /** |
721 | * ata_eh_detach_dev - detach ATA device | |
722 | * @dev: ATA device to detach | |
723 | * | |
724 | * Detach @dev. | |
725 | * | |
726 | * LOCKING: | |
727 | * None. | |
728 | */ | |
729 | static void ata_eh_detach_dev(struct ata_device *dev) | |
730 | { | |
731 | struct ata_port *ap = dev->ap; | |
732 | unsigned long flags; | |
733 | ||
734 | ata_dev_disable(dev); | |
735 | ||
ba6a1308 | 736 | spin_lock_irqsave(ap->lock, flags); |
0ea035a3 TH |
737 | |
738 | dev->flags &= ~ATA_DFLAG_DETACH; | |
739 | ||
740 | if (ata_scsi_offline_dev(dev)) { | |
741 | dev->flags |= ATA_DFLAG_DETACHED; | |
b51e9e5d | 742 | ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG; |
0ea035a3 TH |
743 | } |
744 | ||
beb07c1a TH |
745 | /* clear per-dev EH actions */ |
746 | ata_eh_clear_action(dev, &ap->eh_info, ATA_EH_PERDEV_MASK); | |
747 | ata_eh_clear_action(dev, &ap->eh_context.i, ATA_EH_PERDEV_MASK); | |
748 | ||
ba6a1308 | 749 | spin_unlock_irqrestore(ap->lock, flags); |
0ea035a3 TH |
750 | } |
751 | ||
022bdb07 TH |
752 | /** |
753 | * ata_eh_about_to_do - about to perform eh_action | |
754 | * @ap: target ATA port | |
47005f25 | 755 | * @dev: target ATA dev for per-dev action (can be NULL) |
022bdb07 TH |
756 | * @action: action about to be performed |
757 | * | |
758 | * Called just before performing EH actions to clear related bits | |
759 | * in @ap->eh_info such that eh actions are not unnecessarily | |
760 | * repeated. | |
761 | * | |
762 | * LOCKING: | |
763 | * None. | |
764 | */ | |
47005f25 TH |
765 | static void ata_eh_about_to_do(struct ata_port *ap, struct ata_device *dev, |
766 | unsigned int action) | |
022bdb07 TH |
767 | { |
768 | unsigned long flags; | |
13abf50d TH |
769 | struct ata_eh_info *ehi = &ap->eh_info; |
770 | struct ata_eh_context *ehc = &ap->eh_context; | |
022bdb07 | 771 | |
ba6a1308 | 772 | spin_lock_irqsave(ap->lock, flags); |
1cdaf534 | 773 | |
13abf50d TH |
774 | /* Reset is represented by combination of actions and EHI |
775 | * flags. Suck in all related bits before clearing eh_info to | |
776 | * avoid losing requested action. | |
777 | */ | |
778 | if (action & ATA_EH_RESET_MASK) { | |
779 | ehc->i.action |= ehi->action & ATA_EH_RESET_MASK; | |
780 | ehc->i.flags |= ehi->flags & ATA_EHI_RESET_MODIFIER_MASK; | |
781 | ||
782 | /* make sure all reset actions are cleared & clear EHI flags */ | |
783 | action |= ATA_EH_RESET_MASK; | |
784 | ehi->flags &= ~ATA_EHI_RESET_MODIFIER_MASK; | |
785 | } | |
786 | ||
787 | ata_eh_clear_action(dev, ehi, action); | |
1cdaf534 | 788 | |
13abf50d | 789 | if (!(ehc->i.flags & ATA_EHI_QUIET)) |
1cdaf534 TH |
790 | ap->pflags |= ATA_PFLAG_RECOVERED; |
791 | ||
ba6a1308 | 792 | spin_unlock_irqrestore(ap->lock, flags); |
022bdb07 TH |
793 | } |
794 | ||
47005f25 TH |
795 | /** |
796 | * ata_eh_done - EH action complete | |
797 | * @ap: target ATA port | |
798 | * @dev: target ATA dev for per-dev action (can be NULL) | |
799 | * @action: action just completed | |
800 | * | |
801 | * Called right after performing EH actions to clear related bits | |
802 | * in @ap->eh_context. | |
803 | * | |
804 | * LOCKING: | |
805 | * None. | |
806 | */ | |
807 | static void ata_eh_done(struct ata_port *ap, struct ata_device *dev, | |
808 | unsigned int action) | |
809 | { | |
13abf50d TH |
810 | /* if reset is complete, clear all reset actions & reset modifier */ |
811 | if (action & ATA_EH_RESET_MASK) { | |
812 | action |= ATA_EH_RESET_MASK; | |
813 | ap->eh_context.i.flags &= ~ATA_EHI_RESET_MODIFIER_MASK; | |
814 | } | |
815 | ||
47005f25 TH |
816 | ata_eh_clear_action(dev, &ap->eh_context.i, action); |
817 | } | |
818 | ||
022bdb07 TH |
819 | /** |
820 | * ata_err_string - convert err_mask to descriptive string | |
821 | * @err_mask: error mask to convert to string | |
822 | * | |
823 | * Convert @err_mask to descriptive string. Errors are | |
824 | * prioritized according to severity and only the most severe | |
825 | * error is reported. | |
826 | * | |
827 | * LOCKING: | |
828 | * None. | |
829 | * | |
830 | * RETURNS: | |
831 | * Descriptive string for @err_mask | |
832 | */ | |
833 | static const char * ata_err_string(unsigned int err_mask) | |
834 | { | |
835 | if (err_mask & AC_ERR_HOST_BUS) | |
836 | return "host bus error"; | |
837 | if (err_mask & AC_ERR_ATA_BUS) | |
838 | return "ATA bus error"; | |
839 | if (err_mask & AC_ERR_TIMEOUT) | |
840 | return "timeout"; | |
841 | if (err_mask & AC_ERR_HSM) | |
842 | return "HSM violation"; | |
843 | if (err_mask & AC_ERR_SYSTEM) | |
844 | return "internal error"; | |
845 | if (err_mask & AC_ERR_MEDIA) | |
846 | return "media error"; | |
847 | if (err_mask & AC_ERR_INVALID) | |
848 | return "invalid argument"; | |
849 | if (err_mask & AC_ERR_DEV) | |
850 | return "device error"; | |
851 | return "unknown error"; | |
852 | } | |
853 | ||
e8ee8451 TH |
854 | /** |
855 | * ata_read_log_page - read a specific log page | |
856 | * @dev: target device | |
857 | * @page: page to read | |
858 | * @buf: buffer to store read page | |
859 | * @sectors: number of sectors to read | |
860 | * | |
861 | * Read log page using READ_LOG_EXT command. | |
862 | * | |
863 | * LOCKING: | |
864 | * Kernel thread context (may sleep). | |
865 | * | |
866 | * RETURNS: | |
867 | * 0 on success, AC_ERR_* mask otherwise. | |
868 | */ | |
869 | static unsigned int ata_read_log_page(struct ata_device *dev, | |
870 | u8 page, void *buf, unsigned int sectors) | |
871 | { | |
872 | struct ata_taskfile tf; | |
873 | unsigned int err_mask; | |
874 | ||
875 | DPRINTK("read log page - page %d\n", page); | |
876 | ||
877 | ata_tf_init(dev, &tf); | |
878 | tf.command = ATA_CMD_READ_LOG_EXT; | |
879 | tf.lbal = page; | |
880 | tf.nsect = sectors; | |
881 | tf.hob_nsect = sectors >> 8; | |
882 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_LBA48 | ATA_TFLAG_DEVICE; | |
883 | tf.protocol = ATA_PROT_PIO; | |
884 | ||
885 | err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE, | |
886 | buf, sectors * ATA_SECT_SIZE); | |
887 | ||
888 | DPRINTK("EXIT, err_mask=%x\n", err_mask); | |
889 | return err_mask; | |
890 | } | |
891 | ||
892 | /** | |
893 | * ata_eh_read_log_10h - Read log page 10h for NCQ error details | |
894 | * @dev: Device to read log page 10h from | |
895 | * @tag: Resulting tag of the failed command | |
896 | * @tf: Resulting taskfile registers of the failed command | |
897 | * | |
898 | * Read log page 10h to obtain NCQ error details and clear error | |
899 | * condition. | |
900 | * | |
901 | * LOCKING: | |
902 | * Kernel thread context (may sleep). | |
903 | * | |
904 | * RETURNS: | |
905 | * 0 on success, -errno otherwise. | |
906 | */ | |
907 | static int ata_eh_read_log_10h(struct ata_device *dev, | |
908 | int *tag, struct ata_taskfile *tf) | |
909 | { | |
910 | u8 *buf = dev->ap->sector_buf; | |
911 | unsigned int err_mask; | |
912 | u8 csum; | |
913 | int i; | |
914 | ||
915 | err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, buf, 1); | |
916 | if (err_mask) | |
917 | return -EIO; | |
918 | ||
919 | csum = 0; | |
920 | for (i = 0; i < ATA_SECT_SIZE; i++) | |
921 | csum += buf[i]; | |
922 | if (csum) | |
923 | ata_dev_printk(dev, KERN_WARNING, | |
924 | "invalid checksum 0x%x on log page 10h\n", csum); | |
925 | ||
926 | if (buf[0] & 0x80) | |
927 | return -ENOENT; | |
928 | ||
929 | *tag = buf[0] & 0x1f; | |
930 | ||
931 | tf->command = buf[2]; | |
932 | tf->feature = buf[3]; | |
933 | tf->lbal = buf[4]; | |
934 | tf->lbam = buf[5]; | |
935 | tf->lbah = buf[6]; | |
936 | tf->device = buf[7]; | |
937 | tf->hob_lbal = buf[8]; | |
938 | tf->hob_lbam = buf[9]; | |
939 | tf->hob_lbah = buf[10]; | |
940 | tf->nsect = buf[12]; | |
941 | tf->hob_nsect = buf[13]; | |
942 | ||
943 | return 0; | |
944 | } | |
945 | ||
022bdb07 TH |
946 | /** |
947 | * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE | |
948 | * @dev: device to perform REQUEST_SENSE to | |
949 | * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long) | |
950 | * | |
951 | * Perform ATAPI REQUEST_SENSE after the device reported CHECK | |
952 | * SENSE. This function is EH helper. | |
953 | * | |
954 | * LOCKING: | |
955 | * Kernel thread context (may sleep). | |
956 | * | |
957 | * RETURNS: | |
958 | * 0 on success, AC_ERR_* mask on failure | |
959 | */ | |
960 | static unsigned int atapi_eh_request_sense(struct ata_device *dev, | |
961 | unsigned char *sense_buf) | |
962 | { | |
963 | struct ata_port *ap = dev->ap; | |
964 | struct ata_taskfile tf; | |
965 | u8 cdb[ATAPI_CDB_LEN]; | |
966 | ||
967 | DPRINTK("ATAPI request sense\n"); | |
968 | ||
969 | ata_tf_init(dev, &tf); | |
970 | ||
971 | /* FIXME: is this needed? */ | |
972 | memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE); | |
973 | ||
974 | /* XXX: why tf_read here? */ | |
975 | ap->ops->tf_read(ap, &tf); | |
976 | ||
977 | /* fill these in, for the case where they are -not- overwritten */ | |
978 | sense_buf[0] = 0x70; | |
979 | sense_buf[2] = tf.feature >> 4; | |
980 | ||
981 | memset(cdb, 0, ATAPI_CDB_LEN); | |
982 | cdb[0] = REQUEST_SENSE; | |
983 | cdb[4] = SCSI_SENSE_BUFFERSIZE; | |
984 | ||
985 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; | |
986 | tf.command = ATA_CMD_PACKET; | |
987 | ||
988 | /* is it pointless to prefer PIO for "safety reasons"? */ | |
989 | if (ap->flags & ATA_FLAG_PIO_DMA) { | |
990 | tf.protocol = ATA_PROT_ATAPI_DMA; | |
991 | tf.feature |= ATAPI_PKT_DMA; | |
992 | } else { | |
993 | tf.protocol = ATA_PROT_ATAPI; | |
994 | tf.lbam = (8 * 1024) & 0xff; | |
995 | tf.lbah = (8 * 1024) >> 8; | |
996 | } | |
997 | ||
998 | return ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE, | |
999 | sense_buf, SCSI_SENSE_BUFFERSIZE); | |
1000 | } | |
1001 | ||
1002 | /** | |
1003 | * ata_eh_analyze_serror - analyze SError for a failed port | |
1004 | * @ap: ATA port to analyze SError for | |
1005 | * | |
1006 | * Analyze SError if available and further determine cause of | |
1007 | * failure. | |
1008 | * | |
1009 | * LOCKING: | |
1010 | * None. | |
1011 | */ | |
1012 | static void ata_eh_analyze_serror(struct ata_port *ap) | |
1013 | { | |
1014 | struct ata_eh_context *ehc = &ap->eh_context; | |
1015 | u32 serror = ehc->i.serror; | |
1016 | unsigned int err_mask = 0, action = 0; | |
1017 | ||
1018 | if (serror & SERR_PERSISTENT) { | |
1019 | err_mask |= AC_ERR_ATA_BUS; | |
1020 | action |= ATA_EH_HARDRESET; | |
1021 | } | |
1022 | if (serror & | |
1023 | (SERR_DATA_RECOVERED | SERR_COMM_RECOVERED | SERR_DATA)) { | |
1024 | err_mask |= AC_ERR_ATA_BUS; | |
1025 | action |= ATA_EH_SOFTRESET; | |
1026 | } | |
1027 | if (serror & SERR_PROTOCOL) { | |
1028 | err_mask |= AC_ERR_HSM; | |
1029 | action |= ATA_EH_SOFTRESET; | |
1030 | } | |
1031 | if (serror & SERR_INTERNAL) { | |
1032 | err_mask |= AC_ERR_SYSTEM; | |
1033 | action |= ATA_EH_SOFTRESET; | |
1034 | } | |
084fe639 TH |
1035 | if (serror & (SERR_PHYRDY_CHG | SERR_DEV_XCHG)) |
1036 | ata_ehi_hotplugged(&ehc->i); | |
022bdb07 TH |
1037 | |
1038 | ehc->i.err_mask |= err_mask; | |
1039 | ehc->i.action |= action; | |
1040 | } | |
1041 | ||
e8ee8451 TH |
1042 | /** |
1043 | * ata_eh_analyze_ncq_error - analyze NCQ error | |
1044 | * @ap: ATA port to analyze NCQ error for | |
1045 | * | |
1046 | * Read log page 10h, determine the offending qc and acquire | |
1047 | * error status TF. For NCQ device errors, all LLDDs have to do | |
1048 | * is setting AC_ERR_DEV in ehi->err_mask. This function takes | |
1049 | * care of the rest. | |
1050 | * | |
1051 | * LOCKING: | |
1052 | * Kernel thread context (may sleep). | |
1053 | */ | |
1054 | static void ata_eh_analyze_ncq_error(struct ata_port *ap) | |
1055 | { | |
1056 | struct ata_eh_context *ehc = &ap->eh_context; | |
1057 | struct ata_device *dev = ap->device; | |
1058 | struct ata_queued_cmd *qc; | |
1059 | struct ata_taskfile tf; | |
1060 | int tag, rc; | |
1061 | ||
1062 | /* if frozen, we can't do much */ | |
b51e9e5d | 1063 | if (ap->pflags & ATA_PFLAG_FROZEN) |
e8ee8451 TH |
1064 | return; |
1065 | ||
1066 | /* is it NCQ device error? */ | |
1067 | if (!ap->sactive || !(ehc->i.err_mask & AC_ERR_DEV)) | |
1068 | return; | |
1069 | ||
1070 | /* has LLDD analyzed already? */ | |
1071 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1072 | qc = __ata_qc_from_tag(ap, tag); | |
1073 | ||
1074 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
1075 | continue; | |
1076 | ||
1077 | if (qc->err_mask) | |
1078 | return; | |
1079 | } | |
1080 | ||
1081 | /* okay, this error is ours */ | |
1082 | rc = ata_eh_read_log_10h(dev, &tag, &tf); | |
1083 | if (rc) { | |
1084 | ata_port_printk(ap, KERN_ERR, "failed to read log page 10h " | |
1085 | "(errno=%d)\n", rc); | |
1086 | return; | |
1087 | } | |
1088 | ||
1089 | if (!(ap->sactive & (1 << tag))) { | |
1090 | ata_port_printk(ap, KERN_ERR, "log page 10h reported " | |
1091 | "inactive tag %d\n", tag); | |
1092 | return; | |
1093 | } | |
1094 | ||
1095 | /* we've got the perpetrator, condemn it */ | |
1096 | qc = __ata_qc_from_tag(ap, tag); | |
1097 | memcpy(&qc->result_tf, &tf, sizeof(tf)); | |
1098 | qc->err_mask |= AC_ERR_DEV; | |
1099 | ehc->i.err_mask &= ~AC_ERR_DEV; | |
1100 | } | |
1101 | ||
022bdb07 TH |
1102 | /** |
1103 | * ata_eh_analyze_tf - analyze taskfile of a failed qc | |
1104 | * @qc: qc to analyze | |
1105 | * @tf: Taskfile registers to analyze | |
1106 | * | |
1107 | * Analyze taskfile of @qc and further determine cause of | |
1108 | * failure. This function also requests ATAPI sense data if | |
1109 | * avaliable. | |
1110 | * | |
1111 | * LOCKING: | |
1112 | * Kernel thread context (may sleep). | |
1113 | * | |
1114 | * RETURNS: | |
1115 | * Determined recovery action | |
1116 | */ | |
1117 | static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd *qc, | |
1118 | const struct ata_taskfile *tf) | |
1119 | { | |
1120 | unsigned int tmp, action = 0; | |
1121 | u8 stat = tf->command, err = tf->feature; | |
1122 | ||
1123 | if ((stat & (ATA_BUSY | ATA_DRQ | ATA_DRDY)) != ATA_DRDY) { | |
1124 | qc->err_mask |= AC_ERR_HSM; | |
1125 | return ATA_EH_SOFTRESET; | |
1126 | } | |
1127 | ||
1128 | if (!(qc->err_mask & AC_ERR_DEV)) | |
1129 | return 0; | |
1130 | ||
1131 | switch (qc->dev->class) { | |
1132 | case ATA_DEV_ATA: | |
1133 | if (err & ATA_ICRC) | |
1134 | qc->err_mask |= AC_ERR_ATA_BUS; | |
1135 | if (err & ATA_UNC) | |
1136 | qc->err_mask |= AC_ERR_MEDIA; | |
1137 | if (err & ATA_IDNF) | |
1138 | qc->err_mask |= AC_ERR_INVALID; | |
1139 | break; | |
1140 | ||
1141 | case ATA_DEV_ATAPI: | |
a569a30d TH |
1142 | if (!(qc->ap->pflags & ATA_PFLAG_FROZEN)) { |
1143 | tmp = atapi_eh_request_sense(qc->dev, | |
1144 | qc->scsicmd->sense_buffer); | |
1145 | if (!tmp) { | |
1146 | /* ATA_QCFLAG_SENSE_VALID is used to | |
1147 | * tell atapi_qc_complete() that sense | |
1148 | * data is already valid. | |
1149 | * | |
1150 | * TODO: interpret sense data and set | |
1151 | * appropriate err_mask. | |
1152 | */ | |
1153 | qc->flags |= ATA_QCFLAG_SENSE_VALID; | |
1154 | } else | |
1155 | qc->err_mask |= tmp; | |
1156 | } | |
022bdb07 TH |
1157 | } |
1158 | ||
1159 | if (qc->err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT | AC_ERR_ATA_BUS)) | |
1160 | action |= ATA_EH_SOFTRESET; | |
1161 | ||
1162 | return action; | |
1163 | } | |
1164 | ||
7d47e8d4 | 1165 | static int ata_eh_categorize_error(int is_io, unsigned int err_mask) |
022bdb07 | 1166 | { |
7d47e8d4 | 1167 | if (err_mask & AC_ERR_ATA_BUS) |
022bdb07 TH |
1168 | return 1; |
1169 | ||
7d47e8d4 TH |
1170 | if (err_mask & AC_ERR_TIMEOUT) |
1171 | return 2; | |
1172 | ||
1173 | if (is_io) { | |
1174 | if (err_mask & AC_ERR_HSM) | |
022bdb07 | 1175 | return 2; |
7d47e8d4 TH |
1176 | if ((err_mask & |
1177 | (AC_ERR_DEV|AC_ERR_MEDIA|AC_ERR_INVALID)) == AC_ERR_DEV) | |
1178 | return 3; | |
022bdb07 TH |
1179 | } |
1180 | ||
1181 | return 0; | |
1182 | } | |
1183 | ||
7d47e8d4 | 1184 | struct speed_down_verdict_arg { |
022bdb07 | 1185 | u64 since; |
7d47e8d4 | 1186 | int nr_errors[4]; |
022bdb07 TH |
1187 | }; |
1188 | ||
7d47e8d4 | 1189 | static int speed_down_verdict_cb(struct ata_ering_entry *ent, void *void_arg) |
022bdb07 | 1190 | { |
7d47e8d4 TH |
1191 | struct speed_down_verdict_arg *arg = void_arg; |
1192 | int cat = ata_eh_categorize_error(ent->is_io, ent->err_mask); | |
022bdb07 TH |
1193 | |
1194 | if (ent->timestamp < arg->since) | |
1195 | return -1; | |
1196 | ||
7d47e8d4 | 1197 | arg->nr_errors[cat]++; |
022bdb07 TH |
1198 | return 0; |
1199 | } | |
1200 | ||
1201 | /** | |
7d47e8d4 | 1202 | * ata_eh_speed_down_verdict - Determine speed down verdict |
022bdb07 TH |
1203 | * @dev: Device of interest |
1204 | * | |
1205 | * This function examines error ring of @dev and determines | |
7d47e8d4 TH |
1206 | * whether NCQ needs to be turned off, transfer speed should be |
1207 | * stepped down, or falling back to PIO is necessary. | |
022bdb07 | 1208 | * |
7d47e8d4 | 1209 | * Cat-1 is ATA_BUS error for any command. |
022bdb07 | 1210 | * |
7d47e8d4 TH |
1211 | * Cat-2 is TIMEOUT for any command or HSM violation for known |
1212 | * supported commands. | |
1213 | * | |
1214 | * Cat-3 is is unclassified DEV error for known supported | |
022bdb07 TH |
1215 | * command. |
1216 | * | |
7d47e8d4 TH |
1217 | * NCQ needs to be turned off if there have been more than 3 |
1218 | * Cat-2 + Cat-3 errors during last 10 minutes. | |
1219 | * | |
1220 | * Speed down is necessary if there have been more than 3 Cat-1 + | |
1221 | * Cat-2 errors or 10 Cat-3 errors during last 10 minutes. | |
1222 | * | |
1223 | * Falling back to PIO mode is necessary if there have been more | |
1224 | * than 10 Cat-1 + Cat-2 + Cat-3 errors during last 5 minutes. | |
1225 | * | |
022bdb07 TH |
1226 | * LOCKING: |
1227 | * Inherited from caller. | |
1228 | * | |
1229 | * RETURNS: | |
7d47e8d4 | 1230 | * OR of ATA_EH_SPDN_* flags. |
022bdb07 | 1231 | */ |
7d47e8d4 | 1232 | static unsigned int ata_eh_speed_down_verdict(struct ata_device *dev) |
022bdb07 | 1233 | { |
7d47e8d4 TH |
1234 | const u64 j5mins = 5LLU * 60 * HZ, j10mins = 10LLU * 60 * HZ; |
1235 | u64 j64 = get_jiffies_64(); | |
1236 | struct speed_down_verdict_arg arg; | |
1237 | unsigned int verdict = 0; | |
022bdb07 | 1238 | |
7d47e8d4 TH |
1239 | /* scan past 10 mins of error history */ |
1240 | memset(&arg, 0, sizeof(arg)); | |
1241 | arg.since = j64 - min(j64, j10mins); | |
1242 | ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg); | |
022bdb07 | 1243 | |
7d47e8d4 TH |
1244 | if (arg.nr_errors[2] + arg.nr_errors[3] > 3) |
1245 | verdict |= ATA_EH_SPDN_NCQ_OFF; | |
1246 | if (arg.nr_errors[1] + arg.nr_errors[2] > 3 || arg.nr_errors[3] > 10) | |
1247 | verdict |= ATA_EH_SPDN_SPEED_DOWN; | |
022bdb07 | 1248 | |
7d47e8d4 | 1249 | /* scan past 3 mins of error history */ |
022bdb07 | 1250 | memset(&arg, 0, sizeof(arg)); |
7d47e8d4 TH |
1251 | arg.since = j64 - min(j64, j5mins); |
1252 | ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg); | |
022bdb07 | 1253 | |
7d47e8d4 TH |
1254 | if (arg.nr_errors[1] + arg.nr_errors[2] + arg.nr_errors[3] > 10) |
1255 | verdict |= ATA_EH_SPDN_FALLBACK_TO_PIO; | |
022bdb07 | 1256 | |
7d47e8d4 | 1257 | return verdict; |
022bdb07 TH |
1258 | } |
1259 | ||
1260 | /** | |
1261 | * ata_eh_speed_down - record error and speed down if necessary | |
1262 | * @dev: Failed device | |
1263 | * @is_io: Did the device fail during normal IO? | |
1264 | * @err_mask: err_mask of the error | |
1265 | * | |
1266 | * Record error and examine error history to determine whether | |
1267 | * adjusting transmission speed is necessary. It also sets | |
1268 | * transmission limits appropriately if such adjustment is | |
1269 | * necessary. | |
1270 | * | |
1271 | * LOCKING: | |
1272 | * Kernel thread context (may sleep). | |
1273 | * | |
1274 | * RETURNS: | |
7d47e8d4 | 1275 | * Determined recovery action. |
022bdb07 | 1276 | */ |
7d47e8d4 TH |
1277 | static unsigned int ata_eh_speed_down(struct ata_device *dev, int is_io, |
1278 | unsigned int err_mask) | |
022bdb07 | 1279 | { |
7d47e8d4 TH |
1280 | unsigned int verdict; |
1281 | unsigned int action = 0; | |
1282 | ||
1283 | /* don't bother if Cat-0 error */ | |
1284 | if (ata_eh_categorize_error(is_io, err_mask) == 0) | |
022bdb07 TH |
1285 | return 0; |
1286 | ||
1287 | /* record error and determine whether speed down is necessary */ | |
1288 | ata_ering_record(&dev->ering, is_io, err_mask); | |
7d47e8d4 | 1289 | verdict = ata_eh_speed_down_verdict(dev); |
022bdb07 | 1290 | |
7d47e8d4 TH |
1291 | /* turn off NCQ? */ |
1292 | if ((verdict & ATA_EH_SPDN_NCQ_OFF) && | |
1293 | (dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ | | |
1294 | ATA_DFLAG_NCQ_OFF)) == ATA_DFLAG_NCQ) { | |
1295 | dev->flags |= ATA_DFLAG_NCQ_OFF; | |
1296 | ata_dev_printk(dev, KERN_WARNING, | |
1297 | "NCQ disabled due to excessive errors\n"); | |
1298 | goto done; | |
1299 | } | |
022bdb07 | 1300 | |
7d47e8d4 TH |
1301 | /* speed down? */ |
1302 | if (verdict & ATA_EH_SPDN_SPEED_DOWN) { | |
1303 | /* speed down SATA link speed if possible */ | |
1304 | if (sata_down_spd_limit(dev->ap) == 0) { | |
1305 | action |= ATA_EH_HARDRESET; | |
1306 | goto done; | |
1307 | } | |
022bdb07 | 1308 | |
7d47e8d4 TH |
1309 | /* lower transfer mode */ |
1310 | if (dev->spdn_cnt < 2) { | |
1311 | static const int dma_dnxfer_sel[] = | |
1312 | { ATA_DNXFER_DMA, ATA_DNXFER_40C }; | |
1313 | static const int pio_dnxfer_sel[] = | |
1314 | { ATA_DNXFER_PIO, ATA_DNXFER_FORCE_PIO0 }; | |
1315 | int sel; | |
1316 | ||
1317 | if (dev->xfer_shift != ATA_SHIFT_PIO) | |
1318 | sel = dma_dnxfer_sel[dev->spdn_cnt]; | |
1319 | else | |
1320 | sel = pio_dnxfer_sel[dev->spdn_cnt]; | |
1321 | ||
1322 | dev->spdn_cnt++; | |
1323 | ||
1324 | if (ata_down_xfermask_limit(dev, sel) == 0) { | |
1325 | action |= ATA_EH_SOFTRESET; | |
1326 | goto done; | |
1327 | } | |
1328 | } | |
1329 | } | |
1330 | ||
1331 | /* Fall back to PIO? Slowing down to PIO is meaningless for | |
1332 | * SATA. Consider it only for PATA. | |
1333 | */ | |
1334 | if ((verdict & ATA_EH_SPDN_FALLBACK_TO_PIO) && (dev->spdn_cnt >= 2) && | |
1335 | (dev->ap->cbl != ATA_CBL_SATA) && | |
1336 | (dev->xfer_shift != ATA_SHIFT_PIO)) { | |
1337 | if (ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO) == 0) { | |
1338 | dev->spdn_cnt = 0; | |
1339 | action |= ATA_EH_SOFTRESET; | |
1340 | goto done; | |
1341 | } | |
1342 | } | |
022bdb07 | 1343 | |
022bdb07 | 1344 | return 0; |
7d47e8d4 TH |
1345 | done: |
1346 | /* device has been slowed down, blow error history */ | |
1347 | ata_ering_clear(&dev->ering); | |
1348 | return action; | |
022bdb07 TH |
1349 | } |
1350 | ||
1351 | /** | |
1352 | * ata_eh_autopsy - analyze error and determine recovery action | |
1353 | * @ap: ATA port to perform autopsy on | |
1354 | * | |
1355 | * Analyze why @ap failed and determine which recovery action is | |
1356 | * needed. This function also sets more detailed AC_ERR_* values | |
1357 | * and fills sense data for ATAPI CHECK SENSE. | |
1358 | * | |
1359 | * LOCKING: | |
1360 | * Kernel thread context (may sleep). | |
1361 | */ | |
1362 | static void ata_eh_autopsy(struct ata_port *ap) | |
1363 | { | |
1364 | struct ata_eh_context *ehc = &ap->eh_context; | |
022bdb07 TH |
1365 | unsigned int all_err_mask = 0; |
1366 | int tag, is_io = 0; | |
1367 | u32 serror; | |
1368 | int rc; | |
1369 | ||
1370 | DPRINTK("ENTER\n"); | |
1371 | ||
1cdaf534 TH |
1372 | if (ehc->i.flags & ATA_EHI_NO_AUTOPSY) |
1373 | return; | |
1374 | ||
022bdb07 TH |
1375 | /* obtain and analyze SError */ |
1376 | rc = sata_scr_read(ap, SCR_ERROR, &serror); | |
1377 | if (rc == 0) { | |
1378 | ehc->i.serror |= serror; | |
1379 | ata_eh_analyze_serror(ap); | |
1380 | } else if (rc != -EOPNOTSUPP) | |
4528e4da | 1381 | ehc->i.action |= ATA_EH_HARDRESET; |
022bdb07 | 1382 | |
e8ee8451 TH |
1383 | /* analyze NCQ failure */ |
1384 | ata_eh_analyze_ncq_error(ap); | |
1385 | ||
022bdb07 TH |
1386 | /* any real error trumps AC_ERR_OTHER */ |
1387 | if (ehc->i.err_mask & ~AC_ERR_OTHER) | |
1388 | ehc->i.err_mask &= ~AC_ERR_OTHER; | |
1389 | ||
1390 | all_err_mask |= ehc->i.err_mask; | |
1391 | ||
1392 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1393 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
1394 | ||
1395 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
1396 | continue; | |
1397 | ||
1398 | /* inherit upper level err_mask */ | |
1399 | qc->err_mask |= ehc->i.err_mask; | |
1400 | ||
022bdb07 | 1401 | /* analyze TF */ |
4528e4da | 1402 | ehc->i.action |= ata_eh_analyze_tf(qc, &qc->result_tf); |
022bdb07 TH |
1403 | |
1404 | /* DEV errors are probably spurious in case of ATA_BUS error */ | |
1405 | if (qc->err_mask & AC_ERR_ATA_BUS) | |
1406 | qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_MEDIA | | |
1407 | AC_ERR_INVALID); | |
1408 | ||
1409 | /* any real error trumps unknown error */ | |
1410 | if (qc->err_mask & ~AC_ERR_OTHER) | |
1411 | qc->err_mask &= ~AC_ERR_OTHER; | |
1412 | ||
1413 | /* SENSE_VALID trumps dev/unknown error and revalidation */ | |
1414 | if (qc->flags & ATA_QCFLAG_SENSE_VALID) { | |
1415 | qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_OTHER); | |
4528e4da | 1416 | ehc->i.action &= ~ATA_EH_REVALIDATE; |
022bdb07 TH |
1417 | } |
1418 | ||
1419 | /* accumulate error info */ | |
4528e4da | 1420 | ehc->i.dev = qc->dev; |
022bdb07 TH |
1421 | all_err_mask |= qc->err_mask; |
1422 | if (qc->flags & ATA_QCFLAG_IO) | |
1423 | is_io = 1; | |
1424 | } | |
1425 | ||
a20f33ff | 1426 | /* enforce default EH actions */ |
b51e9e5d | 1427 | if (ap->pflags & ATA_PFLAG_FROZEN || |
a20f33ff | 1428 | all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT)) |
4528e4da | 1429 | ehc->i.action |= ATA_EH_SOFTRESET; |
a20f33ff | 1430 | else if (all_err_mask) |
4528e4da | 1431 | ehc->i.action |= ATA_EH_REVALIDATE; |
022bdb07 | 1432 | |
47005f25 | 1433 | /* if we have offending qcs and the associated failed device */ |
4528e4da | 1434 | if (ehc->i.dev) { |
47005f25 | 1435 | /* speed down */ |
4528e4da TH |
1436 | ehc->i.action |= ata_eh_speed_down(ehc->i.dev, is_io, |
1437 | all_err_mask); | |
47005f25 TH |
1438 | |
1439 | /* perform per-dev EH action only on the offending device */ | |
4528e4da TH |
1440 | ehc->i.dev_action[ehc->i.dev->devno] |= |
1441 | ehc->i.action & ATA_EH_PERDEV_MASK; | |
1442 | ehc->i.action &= ~ATA_EH_PERDEV_MASK; | |
47005f25 TH |
1443 | } |
1444 | ||
022bdb07 TH |
1445 | DPRINTK("EXIT\n"); |
1446 | } | |
1447 | ||
1448 | /** | |
1449 | * ata_eh_report - report error handling to user | |
1450 | * @ap: ATA port EH is going on | |
1451 | * | |
1452 | * Report EH to user. | |
1453 | * | |
1454 | * LOCKING: | |
1455 | * None. | |
1456 | */ | |
1457 | static void ata_eh_report(struct ata_port *ap) | |
1458 | { | |
1459 | struct ata_eh_context *ehc = &ap->eh_context; | |
1460 | const char *frozen, *desc; | |
1461 | int tag, nr_failed = 0; | |
1462 | ||
1463 | desc = NULL; | |
1464 | if (ehc->i.desc[0] != '\0') | |
1465 | desc = ehc->i.desc; | |
1466 | ||
1467 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1468 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
1469 | ||
1470 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
1471 | continue; | |
1472 | if (qc->flags & ATA_QCFLAG_SENSE_VALID && !qc->err_mask) | |
1473 | continue; | |
1474 | ||
1475 | nr_failed++; | |
1476 | } | |
1477 | ||
1478 | if (!nr_failed && !ehc->i.err_mask) | |
1479 | return; | |
1480 | ||
1481 | frozen = ""; | |
b51e9e5d | 1482 | if (ap->pflags & ATA_PFLAG_FROZEN) |
022bdb07 TH |
1483 | frozen = " frozen"; |
1484 | ||
1485 | if (ehc->i.dev) { | |
e8ee8451 TH |
1486 | ata_dev_printk(ehc->i.dev, KERN_ERR, "exception Emask 0x%x " |
1487 | "SAct 0x%x SErr 0x%x action 0x%x%s\n", | |
1488 | ehc->i.err_mask, ap->sactive, ehc->i.serror, | |
1489 | ehc->i.action, frozen); | |
022bdb07 TH |
1490 | if (desc) |
1491 | ata_dev_printk(ehc->i.dev, KERN_ERR, "(%s)\n", desc); | |
1492 | } else { | |
e8ee8451 TH |
1493 | ata_port_printk(ap, KERN_ERR, "exception Emask 0x%x " |
1494 | "SAct 0x%x SErr 0x%x action 0x%x%s\n", | |
1495 | ehc->i.err_mask, ap->sactive, ehc->i.serror, | |
1496 | ehc->i.action, frozen); | |
022bdb07 TH |
1497 | if (desc) |
1498 | ata_port_printk(ap, KERN_ERR, "(%s)\n", desc); | |
1499 | } | |
1500 | ||
1501 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
8a937581 TH |
1502 | static const char *dma_str[] = { |
1503 | [DMA_BIDIRECTIONAL] = "bidi", | |
1504 | [DMA_TO_DEVICE] = "out", | |
1505 | [DMA_FROM_DEVICE] = "in", | |
1506 | [DMA_NONE] = "", | |
1507 | }; | |
022bdb07 | 1508 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); |
8a937581 | 1509 | struct ata_taskfile *cmd = &qc->tf, *res = &qc->result_tf; |
022bdb07 TH |
1510 | |
1511 | if (!(qc->flags & ATA_QCFLAG_FAILED) || !qc->err_mask) | |
1512 | continue; | |
1513 | ||
8a937581 TH |
1514 | ata_dev_printk(qc->dev, KERN_ERR, |
1515 | "cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x " | |
664e8503 | 1516 | "tag %d cdb 0x%x data %u %s\n " |
8a937581 TH |
1517 | "res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x " |
1518 | "Emask 0x%x (%s)\n", | |
1519 | cmd->command, cmd->feature, cmd->nsect, | |
1520 | cmd->lbal, cmd->lbam, cmd->lbah, | |
1521 | cmd->hob_feature, cmd->hob_nsect, | |
1522 | cmd->hob_lbal, cmd->hob_lbam, cmd->hob_lbah, | |
726f0785 | 1523 | cmd->device, qc->tag, qc->cdb[0], qc->nbytes, |
664e8503 | 1524 | dma_str[qc->dma_dir], |
8a937581 TH |
1525 | res->command, res->feature, res->nsect, |
1526 | res->lbal, res->lbam, res->lbah, | |
1527 | res->hob_feature, res->hob_nsect, | |
1528 | res->hob_lbal, res->hob_lbam, res->hob_lbah, | |
1529 | res->device, qc->err_mask, ata_err_string(qc->err_mask)); | |
022bdb07 TH |
1530 | } |
1531 | } | |
1532 | ||
d87fa38e TH |
1533 | static int ata_do_reset(struct ata_port *ap, ata_reset_fn_t reset, |
1534 | unsigned int *classes) | |
1535 | { | |
1536 | int i, rc; | |
1537 | ||
1538 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1539 | classes[i] = ATA_DEV_UNKNOWN; | |
1540 | ||
1541 | rc = reset(ap, classes); | |
1542 | if (rc) | |
1543 | return rc; | |
1544 | ||
1545 | /* If any class isn't ATA_DEV_UNKNOWN, consider classification | |
1546 | * is complete and convert all ATA_DEV_UNKNOWN to | |
1547 | * ATA_DEV_NONE. | |
1548 | */ | |
1549 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1550 | if (classes[i] != ATA_DEV_UNKNOWN) | |
1551 | break; | |
1552 | ||
1553 | if (i < ATA_MAX_DEVICES) | |
1554 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1555 | if (classes[i] == ATA_DEV_UNKNOWN) | |
1556 | classes[i] = ATA_DEV_NONE; | |
1557 | ||
1558 | return 0; | |
1559 | } | |
1560 | ||
664faf09 TH |
1561 | static int ata_eh_followup_srst_needed(int rc, int classify, |
1562 | const unsigned int *classes) | |
1563 | { | |
1564 | if (rc == -EAGAIN) | |
1565 | return 1; | |
1566 | if (rc != 0) | |
1567 | return 0; | |
1568 | if (classify && classes[0] == ATA_DEV_UNKNOWN) | |
1569 | return 1; | |
1570 | return 0; | |
1571 | } | |
1572 | ||
1573 | static int ata_eh_reset(struct ata_port *ap, int classify, | |
f5914a46 | 1574 | ata_prereset_fn_t prereset, ata_reset_fn_t softreset, |
022bdb07 TH |
1575 | ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) |
1576 | { | |
1577 | struct ata_eh_context *ehc = &ap->eh_context; | |
664faf09 | 1578 | unsigned int *classes = ehc->classes; |
022bdb07 | 1579 | int tries = ATA_EH_RESET_TRIES; |
1cdaf534 | 1580 | int verbose = !(ehc->i.flags & ATA_EHI_QUIET); |
f5914a46 | 1581 | unsigned int action; |
022bdb07 | 1582 | ata_reset_fn_t reset; |
664faf09 | 1583 | int i, did_followup_srst, rc; |
022bdb07 | 1584 | |
13abf50d TH |
1585 | /* about to reset */ |
1586 | ata_eh_about_to_do(ap, NULL, ehc->i.action & ATA_EH_RESET_MASK); | |
1587 | ||
f5914a46 TH |
1588 | /* Determine which reset to use and record in ehc->i.action. |
1589 | * prereset() may examine and modify it. | |
1590 | */ | |
1591 | action = ehc->i.action; | |
1592 | ehc->i.action &= ~ATA_EH_RESET_MASK; | |
022bdb07 | 1593 | if (softreset && (!hardreset || (!sata_set_spd_needed(ap) && |
f5914a46 TH |
1594 | !(action & ATA_EH_HARDRESET)))) |
1595 | ehc->i.action |= ATA_EH_SOFTRESET; | |
022bdb07 | 1596 | else |
f5914a46 TH |
1597 | ehc->i.action |= ATA_EH_HARDRESET; |
1598 | ||
1599 | if (prereset) { | |
1600 | rc = prereset(ap); | |
1601 | if (rc) { | |
c961922b AC |
1602 | if (rc == -ENOENT) { |
1603 | ata_port_printk(ap, KERN_DEBUG, "port disabled. ignoring.\n"); | |
1604 | ap->eh_context.i.action &= ~ATA_EH_RESET_MASK; | |
1605 | } else | |
1606 | ata_port_printk(ap, KERN_ERR, | |
f5914a46 TH |
1607 | "prereset failed (errno=%d)\n", rc); |
1608 | return rc; | |
1609 | } | |
1610 | } | |
1611 | ||
1612 | /* prereset() might have modified ehc->i.action */ | |
1613 | if (ehc->i.action & ATA_EH_HARDRESET) | |
022bdb07 | 1614 | reset = hardreset; |
f5914a46 TH |
1615 | else if (ehc->i.action & ATA_EH_SOFTRESET) |
1616 | reset = softreset; | |
1617 | else { | |
1618 | /* prereset told us not to reset, bang classes and return */ | |
1619 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1620 | classes[i] = ATA_DEV_NONE; | |
1621 | return 0; | |
1622 | } | |
1623 | ||
1624 | /* did prereset() screw up? if so, fix up to avoid oopsing */ | |
1625 | if (!reset) { | |
1626 | ata_port_printk(ap, KERN_ERR, "BUG: prereset() requested " | |
1627 | "invalid reset type\n"); | |
1628 | if (softreset) | |
1629 | reset = softreset; | |
1630 | else | |
1631 | reset = hardreset; | |
1632 | } | |
022bdb07 TH |
1633 | |
1634 | retry: | |
3e706399 TH |
1635 | /* shut up during boot probing */ |
1636 | if (verbose) | |
1637 | ata_port_printk(ap, KERN_INFO, "%s resetting port\n", | |
1638 | reset == softreset ? "soft" : "hard"); | |
022bdb07 | 1639 | |
13abf50d | 1640 | /* mark that this EH session started with reset */ |
022bdb07 TH |
1641 | ehc->i.flags |= ATA_EHI_DID_RESET; |
1642 | ||
1643 | rc = ata_do_reset(ap, reset, classes); | |
1644 | ||
664faf09 TH |
1645 | did_followup_srst = 0; |
1646 | if (reset == hardreset && | |
1647 | ata_eh_followup_srst_needed(rc, classify, classes)) { | |
1648 | /* okay, let's do follow-up softreset */ | |
1649 | did_followup_srst = 1; | |
1650 | reset = softreset; | |
1651 | ||
1652 | if (!reset) { | |
1653 | ata_port_printk(ap, KERN_ERR, | |
1654 | "follow-up softreset required " | |
1655 | "but no softreset avaliable\n"); | |
1656 | return -EINVAL; | |
1657 | } | |
1658 | ||
47005f25 | 1659 | ata_eh_about_to_do(ap, NULL, ATA_EH_RESET_MASK); |
664faf09 TH |
1660 | rc = ata_do_reset(ap, reset, classes); |
1661 | ||
1662 | if (rc == 0 && classify && | |
1663 | classes[0] == ATA_DEV_UNKNOWN) { | |
1664 | ata_port_printk(ap, KERN_ERR, | |
1665 | "classification failed\n"); | |
1666 | return -EINVAL; | |
1667 | } | |
1668 | } | |
1669 | ||
022bdb07 | 1670 | if (rc && --tries) { |
664faf09 TH |
1671 | const char *type; |
1672 | ||
1673 | if (reset == softreset) { | |
1674 | if (did_followup_srst) | |
1675 | type = "follow-up soft"; | |
1676 | else | |
1677 | type = "soft"; | |
1678 | } else | |
1679 | type = "hard"; | |
1680 | ||
022bdb07 | 1681 | ata_port_printk(ap, KERN_WARNING, |
664faf09 | 1682 | "%sreset failed, retrying in 5 secs\n", type); |
022bdb07 TH |
1683 | ssleep(5); |
1684 | ||
1685 | if (reset == hardreset) | |
1686 | sata_down_spd_limit(ap); | |
1687 | if (hardreset) | |
1688 | reset = hardreset; | |
1689 | goto retry; | |
1690 | } | |
1691 | ||
1692 | if (rc == 0) { | |
20952b69 TH |
1693 | /* After the reset, the device state is PIO 0 and the |
1694 | * controller state is undefined. Record the mode. | |
1695 | */ | |
1696 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1697 | ap->device[i].pio_mode = XFER_PIO_0; | |
1698 | ||
022bdb07 TH |
1699 | if (postreset) |
1700 | postreset(ap, classes); | |
1701 | ||
1702 | /* reset successful, schedule revalidation */ | |
13abf50d | 1703 | ata_eh_done(ap, NULL, ehc->i.action & ATA_EH_RESET_MASK); |
022bdb07 TH |
1704 | ehc->i.action |= ATA_EH_REVALIDATE; |
1705 | } | |
1706 | ||
1707 | return rc; | |
1708 | } | |
1709 | ||
084fe639 TH |
1710 | static int ata_eh_revalidate_and_attach(struct ata_port *ap, |
1711 | struct ata_device **r_failed_dev) | |
022bdb07 TH |
1712 | { |
1713 | struct ata_eh_context *ehc = &ap->eh_context; | |
1714 | struct ata_device *dev; | |
084fe639 | 1715 | unsigned long flags; |
022bdb07 TH |
1716 | int i, rc = 0; |
1717 | ||
1718 | DPRINTK("ENTER\n"); | |
1719 | ||
1720 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
bff04647 | 1721 | unsigned int action, readid_flags = 0; |
47005f25 | 1722 | |
022bdb07 | 1723 | dev = &ap->device[i]; |
64f65ca6 | 1724 | action = ata_eh_dev_action(dev); |
022bdb07 | 1725 | |
bff04647 TH |
1726 | if (ehc->i.flags & ATA_EHI_DID_RESET) |
1727 | readid_flags |= ATA_READID_POSTRESET; | |
1728 | ||
02670bf3 | 1729 | if (action & ATA_EH_REVALIDATE && ata_dev_ready(dev)) { |
022bdb07 TH |
1730 | if (ata_port_offline(ap)) { |
1731 | rc = -EIO; | |
1732 | break; | |
1733 | } | |
1734 | ||
47005f25 | 1735 | ata_eh_about_to_do(ap, dev, ATA_EH_REVALIDATE); |
bff04647 | 1736 | rc = ata_dev_revalidate(dev, readid_flags); |
022bdb07 TH |
1737 | if (rc) |
1738 | break; | |
1739 | ||
47005f25 TH |
1740 | ata_eh_done(ap, dev, ATA_EH_REVALIDATE); |
1741 | ||
baa1e78a TH |
1742 | /* Configuration may have changed, reconfigure |
1743 | * transfer mode. | |
1744 | */ | |
1745 | ehc->i.flags |= ATA_EHI_SETMODE; | |
1746 | ||
3057ac3c | 1747 | /* schedule the scsi_rescan_device() here */ |
1748 | queue_work(ata_aux_wq, &(ap->scsi_rescan_task)); | |
084fe639 TH |
1749 | } else if (dev->class == ATA_DEV_UNKNOWN && |
1750 | ehc->tries[dev->devno] && | |
1751 | ata_class_enabled(ehc->classes[dev->devno])) { | |
1752 | dev->class = ehc->classes[dev->devno]; | |
1753 | ||
bff04647 TH |
1754 | rc = ata_dev_read_id(dev, &dev->class, readid_flags, |
1755 | dev->id); | |
efdaedc4 TH |
1756 | if (rc == 0) { |
1757 | ehc->i.flags |= ATA_EHI_PRINTINFO; | |
1758 | rc = ata_dev_configure(dev); | |
1759 | ehc->i.flags &= ~ATA_EHI_PRINTINFO; | |
55a8e2c8 TH |
1760 | } else if (rc == -ENOENT) { |
1761 | /* IDENTIFY was issued to non-existent | |
1762 | * device. No need to reset. Just | |
1763 | * thaw and kill the device. | |
1764 | */ | |
1765 | ata_eh_thaw_port(ap); | |
1766 | dev->class = ATA_DEV_UNKNOWN; | |
1767 | rc = 0; | |
efdaedc4 | 1768 | } |
084fe639 TH |
1769 | |
1770 | if (rc) { | |
1771 | dev->class = ATA_DEV_UNKNOWN; | |
1772 | break; | |
1773 | } | |
1774 | ||
55a8e2c8 TH |
1775 | if (ata_dev_enabled(dev)) { |
1776 | spin_lock_irqsave(ap->lock, flags); | |
1777 | ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG; | |
1778 | spin_unlock_irqrestore(ap->lock, flags); | |
baa1e78a | 1779 | |
55a8e2c8 TH |
1780 | /* new device discovered, configure xfermode */ |
1781 | ehc->i.flags |= ATA_EHI_SETMODE; | |
1782 | } | |
022bdb07 TH |
1783 | } |
1784 | } | |
1785 | ||
47005f25 | 1786 | if (rc) |
022bdb07 TH |
1787 | *r_failed_dev = dev; |
1788 | ||
1789 | DPRINTK("EXIT\n"); | |
1790 | return rc; | |
1791 | } | |
1792 | ||
02670bf3 TH |
1793 | /** |
1794 | * ata_eh_suspend - handle suspend EH action | |
1795 | * @ap: target host port | |
1796 | * @r_failed_dev: result parameter to indicate failing device | |
1797 | * | |
1798 | * Handle suspend EH action. Disk devices are spinned down and | |
1799 | * other types of devices are just marked suspended. Once | |
1800 | * suspended, no EH action to the device is allowed until it is | |
1801 | * resumed. | |
1802 | * | |
1803 | * LOCKING: | |
1804 | * Kernel thread context (may sleep). | |
1805 | * | |
1806 | * RETURNS: | |
1807 | * 0 on success, -errno otherwise | |
1808 | */ | |
1809 | static int ata_eh_suspend(struct ata_port *ap, struct ata_device **r_failed_dev) | |
1810 | { | |
1811 | struct ata_device *dev; | |
1812 | int i, rc = 0; | |
1813 | ||
1814 | DPRINTK("ENTER\n"); | |
1815 | ||
1816 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
1817 | unsigned long flags; | |
1818 | unsigned int action, err_mask; | |
1819 | ||
1820 | dev = &ap->device[i]; | |
1821 | action = ata_eh_dev_action(dev); | |
1822 | ||
1823 | if (!ata_dev_enabled(dev) || !(action & ATA_EH_SUSPEND)) | |
1824 | continue; | |
1825 | ||
1826 | WARN_ON(dev->flags & ATA_DFLAG_SUSPENDED); | |
1827 | ||
1828 | ata_eh_about_to_do(ap, dev, ATA_EH_SUSPEND); | |
1829 | ||
1830 | if (dev->class == ATA_DEV_ATA && !(action & ATA_EH_PM_FREEZE)) { | |
1831 | /* flush cache */ | |
1832 | rc = ata_flush_cache(dev); | |
1833 | if (rc) | |
1834 | break; | |
1835 | ||
1836 | /* spin down */ | |
1837 | err_mask = ata_do_simple_cmd(dev, ATA_CMD_STANDBYNOW1); | |
1838 | if (err_mask) { | |
1839 | ata_dev_printk(dev, KERN_ERR, "failed to " | |
1840 | "spin down (err_mask=0x%x)\n", | |
1841 | err_mask); | |
1842 | rc = -EIO; | |
1843 | break; | |
1844 | } | |
1845 | } | |
1846 | ||
1847 | spin_lock_irqsave(ap->lock, flags); | |
1848 | dev->flags |= ATA_DFLAG_SUSPENDED; | |
1849 | spin_unlock_irqrestore(ap->lock, flags); | |
1850 | ||
1851 | ata_eh_done(ap, dev, ATA_EH_SUSPEND); | |
1852 | } | |
1853 | ||
1854 | if (rc) | |
1855 | *r_failed_dev = dev; | |
1856 | ||
1857 | DPRINTK("EXIT\n"); | |
03ee5b1c | 1858 | return rc; |
02670bf3 TH |
1859 | } |
1860 | ||
1861 | /** | |
1862 | * ata_eh_prep_resume - prep for resume EH action | |
1863 | * @ap: target host port | |
1864 | * | |
1865 | * Clear SUSPENDED in preparation for scheduled resume actions. | |
1866 | * This allows other parts of EH to access the devices being | |
1867 | * resumed. | |
1868 | * | |
1869 | * LOCKING: | |
1870 | * Kernel thread context (may sleep). | |
1871 | */ | |
1872 | static void ata_eh_prep_resume(struct ata_port *ap) | |
1873 | { | |
1874 | struct ata_device *dev; | |
1875 | unsigned long flags; | |
1876 | int i; | |
1877 | ||
1878 | DPRINTK("ENTER\n"); | |
1879 | ||
1880 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
1881 | unsigned int action; | |
1882 | ||
1883 | dev = &ap->device[i]; | |
1884 | action = ata_eh_dev_action(dev); | |
1885 | ||
1886 | if (!ata_dev_enabled(dev) || !(action & ATA_EH_RESUME)) | |
1887 | continue; | |
1888 | ||
1889 | spin_lock_irqsave(ap->lock, flags); | |
1890 | dev->flags &= ~ATA_DFLAG_SUSPENDED; | |
1891 | spin_unlock_irqrestore(ap->lock, flags); | |
1892 | } | |
1893 | ||
1894 | DPRINTK("EXIT\n"); | |
1895 | } | |
1896 | ||
1897 | /** | |
1898 | * ata_eh_resume - handle resume EH action | |
1899 | * @ap: target host port | |
1900 | * @r_failed_dev: result parameter to indicate failing device | |
1901 | * | |
1902 | * Handle resume EH action. Target devices are already reset and | |
1903 | * revalidated. Spinning up is the only operation left. | |
1904 | * | |
1905 | * LOCKING: | |
1906 | * Kernel thread context (may sleep). | |
1907 | * | |
1908 | * RETURNS: | |
1909 | * 0 on success, -errno otherwise | |
1910 | */ | |
1911 | static int ata_eh_resume(struct ata_port *ap, struct ata_device **r_failed_dev) | |
1912 | { | |
1913 | struct ata_device *dev; | |
1914 | int i, rc = 0; | |
1915 | ||
1916 | DPRINTK("ENTER\n"); | |
1917 | ||
1918 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
1919 | unsigned int action, err_mask; | |
1920 | ||
1921 | dev = &ap->device[i]; | |
1922 | action = ata_eh_dev_action(dev); | |
1923 | ||
1924 | if (!ata_dev_enabled(dev) || !(action & ATA_EH_RESUME)) | |
1925 | continue; | |
1926 | ||
1927 | ata_eh_about_to_do(ap, dev, ATA_EH_RESUME); | |
1928 | ||
1929 | if (dev->class == ATA_DEV_ATA && !(action & ATA_EH_PM_FREEZE)) { | |
1930 | err_mask = ata_do_simple_cmd(dev, | |
1931 | ATA_CMD_IDLEIMMEDIATE); | |
1932 | if (err_mask) { | |
1933 | ata_dev_printk(dev, KERN_ERR, "failed to " | |
1934 | "spin up (err_mask=0x%x)\n", | |
1935 | err_mask); | |
1936 | rc = -EIO; | |
1937 | break; | |
1938 | } | |
1939 | } | |
1940 | ||
1941 | ata_eh_done(ap, dev, ATA_EH_RESUME); | |
1942 | } | |
1943 | ||
1944 | if (rc) | |
1945 | *r_failed_dev = dev; | |
1946 | ||
1947 | DPRINTK("EXIT\n"); | |
1948 | return 0; | |
1949 | } | |
1950 | ||
022bdb07 TH |
1951 | static int ata_port_nr_enabled(struct ata_port *ap) |
1952 | { | |
1953 | int i, cnt = 0; | |
1954 | ||
1955 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1956 | if (ata_dev_enabled(&ap->device[i])) | |
1957 | cnt++; | |
1958 | return cnt; | |
1959 | } | |
1960 | ||
084fe639 TH |
1961 | static int ata_port_nr_vacant(struct ata_port *ap) |
1962 | { | |
1963 | int i, cnt = 0; | |
1964 | ||
1965 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1966 | if (ap->device[i].class == ATA_DEV_UNKNOWN) | |
1967 | cnt++; | |
1968 | return cnt; | |
1969 | } | |
1970 | ||
1971 | static int ata_eh_skip_recovery(struct ata_port *ap) | |
1972 | { | |
1973 | struct ata_eh_context *ehc = &ap->eh_context; | |
1974 | int i; | |
1975 | ||
02670bf3 TH |
1976 | /* skip if all possible devices are suspended */ |
1977 | for (i = 0; i < ata_port_max_devices(ap); i++) { | |
1978 | struct ata_device *dev = &ap->device[i]; | |
1979 | ||
7c8c2cff | 1980 | if (!(dev->flags & ATA_DFLAG_SUSPENDED)) |
02670bf3 TH |
1981 | break; |
1982 | } | |
1983 | ||
1984 | if (i == ata_port_max_devices(ap)) | |
1985 | return 1; | |
1986 | ||
7c8c2cff TH |
1987 | /* thaw frozen port, resume link and recover failed devices */ |
1988 | if ((ap->pflags & ATA_PFLAG_FROZEN) || | |
1989 | (ehc->i.flags & ATA_EHI_RESUME_LINK) || ata_port_nr_enabled(ap)) | |
084fe639 TH |
1990 | return 0; |
1991 | ||
1992 | /* skip if class codes for all vacant slots are ATA_DEV_NONE */ | |
1993 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
1994 | struct ata_device *dev = &ap->device[i]; | |
1995 | ||
1996 | if (dev->class == ATA_DEV_UNKNOWN && | |
1997 | ehc->classes[dev->devno] != ATA_DEV_NONE) | |
1998 | return 0; | |
1999 | } | |
2000 | ||
2001 | return 1; | |
2002 | } | |
2003 | ||
022bdb07 TH |
2004 | /** |
2005 | * ata_eh_recover - recover host port after error | |
2006 | * @ap: host port to recover | |
f5914a46 | 2007 | * @prereset: prereset method (can be NULL) |
022bdb07 TH |
2008 | * @softreset: softreset method (can be NULL) |
2009 | * @hardreset: hardreset method (can be NULL) | |
2010 | * @postreset: postreset method (can be NULL) | |
2011 | * | |
2012 | * This is the alpha and omega, eum and yang, heart and soul of | |
2013 | * libata exception handling. On entry, actions required to | |
084fe639 TH |
2014 | * recover the port and hotplug requests are recorded in |
2015 | * eh_context. This function executes all the operations with | |
2016 | * appropriate retrials and fallbacks to resurrect failed | |
2017 | * devices, detach goners and greet newcomers. | |
022bdb07 TH |
2018 | * |
2019 | * LOCKING: | |
2020 | * Kernel thread context (may sleep). | |
2021 | * | |
2022 | * RETURNS: | |
2023 | * 0 on success, -errno on failure. | |
2024 | */ | |
f5914a46 TH |
2025 | static int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset, |
2026 | ata_reset_fn_t softreset, ata_reset_fn_t hardreset, | |
022bdb07 TH |
2027 | ata_postreset_fn_t postreset) |
2028 | { | |
2029 | struct ata_eh_context *ehc = &ap->eh_context; | |
2030 | struct ata_device *dev; | |
4ae72a1e | 2031 | int i, rc; |
022bdb07 TH |
2032 | |
2033 | DPRINTK("ENTER\n"); | |
2034 | ||
2035 | /* prep for recovery */ | |
2036 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
2037 | dev = &ap->device[i]; | |
2038 | ||
2039 | ehc->tries[dev->devno] = ATA_EH_DEV_TRIES; | |
084fe639 | 2040 | |
79a55b72 TH |
2041 | /* collect port action mask recorded in dev actions */ |
2042 | ehc->i.action |= ehc->i.dev_action[i] & ~ATA_EH_PERDEV_MASK; | |
2043 | ehc->i.dev_action[i] &= ATA_EH_PERDEV_MASK; | |
2044 | ||
084fe639 TH |
2045 | /* process hotplug request */ |
2046 | if (dev->flags & ATA_DFLAG_DETACH) | |
2047 | ata_eh_detach_dev(dev); | |
2048 | ||
2049 | if (!ata_dev_enabled(dev) && | |
2050 | ((ehc->i.probe_mask & (1 << dev->devno)) && | |
2051 | !(ehc->did_probe_mask & (1 << dev->devno)))) { | |
2052 | ata_eh_detach_dev(dev); | |
2053 | ata_dev_init(dev); | |
2054 | ehc->did_probe_mask |= (1 << dev->devno); | |
2055 | ehc->i.action |= ATA_EH_SOFTRESET; | |
2056 | } | |
022bdb07 TH |
2057 | } |
2058 | ||
2059 | retry: | |
022bdb07 TH |
2060 | rc = 0; |
2061 | ||
aeb2ecd6 | 2062 | /* if UNLOADING, finish immediately */ |
b51e9e5d | 2063 | if (ap->pflags & ATA_PFLAG_UNLOADING) |
aeb2ecd6 TH |
2064 | goto out; |
2065 | ||
02670bf3 TH |
2066 | /* prep for resume */ |
2067 | ata_eh_prep_resume(ap); | |
2068 | ||
022bdb07 | 2069 | /* skip EH if possible. */ |
084fe639 | 2070 | if (ata_eh_skip_recovery(ap)) |
022bdb07 TH |
2071 | ehc->i.action = 0; |
2072 | ||
084fe639 TH |
2073 | for (i = 0; i < ATA_MAX_DEVICES; i++) |
2074 | ehc->classes[i] = ATA_DEV_UNKNOWN; | |
2075 | ||
022bdb07 TH |
2076 | /* reset */ |
2077 | if (ehc->i.action & ATA_EH_RESET_MASK) { | |
2078 | ata_eh_freeze_port(ap); | |
2079 | ||
084fe639 TH |
2080 | rc = ata_eh_reset(ap, ata_port_nr_vacant(ap), prereset, |
2081 | softreset, hardreset, postreset); | |
022bdb07 TH |
2082 | if (rc) { |
2083 | ata_port_printk(ap, KERN_ERR, | |
2084 | "reset failed, giving up\n"); | |
2085 | goto out; | |
2086 | } | |
2087 | ||
2088 | ata_eh_thaw_port(ap); | |
2089 | } | |
2090 | ||
084fe639 TH |
2091 | /* revalidate existing devices and attach new ones */ |
2092 | rc = ata_eh_revalidate_and_attach(ap, &dev); | |
022bdb07 TH |
2093 | if (rc) |
2094 | goto dev_fail; | |
2095 | ||
02670bf3 TH |
2096 | /* resume devices */ |
2097 | rc = ata_eh_resume(ap, &dev); | |
2098 | if (rc) | |
2099 | goto dev_fail; | |
2100 | ||
baa1e78a TH |
2101 | /* configure transfer mode if necessary */ |
2102 | if (ehc->i.flags & ATA_EHI_SETMODE) { | |
022bdb07 | 2103 | rc = ata_set_mode(ap, &dev); |
4ae72a1e | 2104 | if (rc) |
022bdb07 | 2105 | goto dev_fail; |
baa1e78a | 2106 | ehc->i.flags &= ~ATA_EHI_SETMODE; |
022bdb07 TH |
2107 | } |
2108 | ||
02670bf3 TH |
2109 | /* suspend devices */ |
2110 | rc = ata_eh_suspend(ap, &dev); | |
2111 | if (rc) | |
2112 | goto dev_fail; | |
2113 | ||
022bdb07 TH |
2114 | goto out; |
2115 | ||
2116 | dev_fail: | |
4ae72a1e TH |
2117 | ehc->tries[dev->devno]--; |
2118 | ||
022bdb07 | 2119 | switch (rc) { |
022bdb07 | 2120 | case -EINVAL: |
4ae72a1e | 2121 | /* eeek, something went very wrong, give up */ |
022bdb07 TH |
2122 | ehc->tries[dev->devno] = 0; |
2123 | break; | |
4ae72a1e TH |
2124 | |
2125 | case -ENODEV: | |
2126 | /* device missing or wrong IDENTIFY data, schedule probing */ | |
2127 | ehc->i.probe_mask |= (1 << dev->devno); | |
2128 | /* give it just one more chance */ | |
2129 | ehc->tries[dev->devno] = min(ehc->tries[dev->devno], 1); | |
022bdb07 | 2130 | case -EIO: |
4ae72a1e TH |
2131 | if (ehc->tries[dev->devno] == 1) { |
2132 | /* This is the last chance, better to slow | |
2133 | * down than lose it. | |
2134 | */ | |
2135 | sata_down_spd_limit(ap); | |
2136 | ata_down_xfermask_limit(dev, ATA_DNXFER_PIO); | |
2137 | } | |
022bdb07 TH |
2138 | } |
2139 | ||
084fe639 TH |
2140 | if (ata_dev_enabled(dev) && !ehc->tries[dev->devno]) { |
2141 | /* disable device if it has used up all its chances */ | |
022bdb07 TH |
2142 | ata_dev_disable(dev); |
2143 | ||
084fe639 TH |
2144 | /* detach if offline */ |
2145 | if (ata_port_offline(ap)) | |
2146 | ata_eh_detach_dev(dev); | |
2147 | ||
2148 | /* probe if requested */ | |
2149 | if ((ehc->i.probe_mask & (1 << dev->devno)) && | |
2150 | !(ehc->did_probe_mask & (1 << dev->devno))) { | |
2151 | ata_eh_detach_dev(dev); | |
2152 | ata_dev_init(dev); | |
2153 | ||
2154 | ehc->tries[dev->devno] = ATA_EH_DEV_TRIES; | |
2155 | ehc->did_probe_mask |= (1 << dev->devno); | |
2156 | ehc->i.action |= ATA_EH_SOFTRESET; | |
2157 | } | |
2158 | } else { | |
2159 | /* soft didn't work? be haaaaard */ | |
2160 | if (ehc->i.flags & ATA_EHI_DID_RESET) | |
2161 | ehc->i.action |= ATA_EH_HARDRESET; | |
2162 | else | |
2163 | ehc->i.action |= ATA_EH_SOFTRESET; | |
2164 | } | |
022bdb07 TH |
2165 | |
2166 | if (ata_port_nr_enabled(ap)) { | |
2167 | ata_port_printk(ap, KERN_WARNING, "failed to recover some " | |
2168 | "devices, retrying in 5 secs\n"); | |
2169 | ssleep(5); | |
2170 | } else { | |
2171 | /* no device left, repeat fast */ | |
2172 | msleep(500); | |
2173 | } | |
2174 | ||
2175 | goto retry; | |
2176 | ||
2177 | out: | |
2178 | if (rc) { | |
2179 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
2180 | ata_dev_disable(&ap->device[i]); | |
2181 | } | |
2182 | ||
2183 | DPRINTK("EXIT, rc=%d\n", rc); | |
2184 | return rc; | |
2185 | } | |
2186 | ||
2187 | /** | |
2188 | * ata_eh_finish - finish up EH | |
2189 | * @ap: host port to finish EH for | |
2190 | * | |
2191 | * Recovery is complete. Clean up EH states and retry or finish | |
2192 | * failed qcs. | |
2193 | * | |
2194 | * LOCKING: | |
2195 | * None. | |
2196 | */ | |
2197 | static void ata_eh_finish(struct ata_port *ap) | |
2198 | { | |
2199 | int tag; | |
2200 | ||
2201 | /* retry or finish qcs */ | |
2202 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
2203 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
2204 | ||
2205 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
2206 | continue; | |
2207 | ||
2208 | if (qc->err_mask) { | |
2209 | /* FIXME: Once EH migration is complete, | |
2210 | * generate sense data in this function, | |
2211 | * considering both err_mask and tf. | |
2212 | */ | |
2213 | if (qc->err_mask & AC_ERR_INVALID) | |
2214 | ata_eh_qc_complete(qc); | |
2215 | else | |
2216 | ata_eh_qc_retry(qc); | |
2217 | } else { | |
2218 | if (qc->flags & ATA_QCFLAG_SENSE_VALID) { | |
2219 | ata_eh_qc_complete(qc); | |
2220 | } else { | |
2221 | /* feed zero TF to sense generation */ | |
2222 | memset(&qc->result_tf, 0, sizeof(qc->result_tf)); | |
2223 | ata_eh_qc_retry(qc); | |
2224 | } | |
2225 | } | |
2226 | } | |
2227 | } | |
2228 | ||
2229 | /** | |
2230 | * ata_do_eh - do standard error handling | |
2231 | * @ap: host port to handle error for | |
f5914a46 | 2232 | * @prereset: prereset method (can be NULL) |
022bdb07 TH |
2233 | * @softreset: softreset method (can be NULL) |
2234 | * @hardreset: hardreset method (can be NULL) | |
2235 | * @postreset: postreset method (can be NULL) | |
2236 | * | |
2237 | * Perform standard error handling sequence. | |
2238 | * | |
2239 | * LOCKING: | |
2240 | * Kernel thread context (may sleep). | |
2241 | */ | |
f5914a46 TH |
2242 | void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset, |
2243 | ata_reset_fn_t softreset, ata_reset_fn_t hardreset, | |
2244 | ata_postreset_fn_t postreset) | |
022bdb07 | 2245 | { |
1cdaf534 TH |
2246 | ata_eh_autopsy(ap); |
2247 | ata_eh_report(ap); | |
f5914a46 | 2248 | ata_eh_recover(ap, prereset, softreset, hardreset, postreset); |
022bdb07 TH |
2249 | ata_eh_finish(ap); |
2250 | } | |
500530f6 TH |
2251 | |
2252 | /** | |
2253 | * ata_eh_handle_port_suspend - perform port suspend operation | |
2254 | * @ap: port to suspend | |
2255 | * | |
2256 | * Suspend @ap. | |
2257 | * | |
2258 | * LOCKING: | |
2259 | * Kernel thread context (may sleep). | |
2260 | */ | |
2261 | static void ata_eh_handle_port_suspend(struct ata_port *ap) | |
2262 | { | |
2263 | unsigned long flags; | |
2264 | int rc = 0; | |
2265 | ||
2266 | /* are we suspending? */ | |
2267 | spin_lock_irqsave(ap->lock, flags); | |
2268 | if (!(ap->pflags & ATA_PFLAG_PM_PENDING) || | |
2269 | ap->pm_mesg.event == PM_EVENT_ON) { | |
2270 | spin_unlock_irqrestore(ap->lock, flags); | |
2271 | return; | |
2272 | } | |
2273 | spin_unlock_irqrestore(ap->lock, flags); | |
2274 | ||
2275 | WARN_ON(ap->pflags & ATA_PFLAG_SUSPENDED); | |
2276 | ||
2277 | /* suspend */ | |
2278 | ata_eh_freeze_port(ap); | |
2279 | ||
2280 | if (ap->ops->port_suspend) | |
2281 | rc = ap->ops->port_suspend(ap, ap->pm_mesg); | |
2282 | ||
2283 | /* report result */ | |
2284 | spin_lock_irqsave(ap->lock, flags); | |
2285 | ||
2286 | ap->pflags &= ~ATA_PFLAG_PM_PENDING; | |
2287 | if (rc == 0) | |
2288 | ap->pflags |= ATA_PFLAG_SUSPENDED; | |
2289 | else | |
2290 | ata_port_schedule_eh(ap); | |
2291 | ||
2292 | if (ap->pm_result) { | |
2293 | *ap->pm_result = rc; | |
2294 | ap->pm_result = NULL; | |
2295 | } | |
2296 | ||
2297 | spin_unlock_irqrestore(ap->lock, flags); | |
2298 | ||
2299 | return; | |
2300 | } | |
2301 | ||
2302 | /** | |
2303 | * ata_eh_handle_port_resume - perform port resume operation | |
2304 | * @ap: port to resume | |
2305 | * | |
2306 | * Resume @ap. | |
2307 | * | |
2308 | * This function also waits upto one second until all devices | |
2309 | * hanging off this port requests resume EH action. This is to | |
2310 | * prevent invoking EH and thus reset multiple times on resume. | |
2311 | * | |
2312 | * On DPM resume, where some of devices might not be resumed | |
2313 | * together, this may delay port resume upto one second, but such | |
2314 | * DPM resumes are rare and 1 sec delay isn't too bad. | |
2315 | * | |
2316 | * LOCKING: | |
2317 | * Kernel thread context (may sleep). | |
2318 | */ | |
2319 | static void ata_eh_handle_port_resume(struct ata_port *ap) | |
2320 | { | |
2321 | unsigned long timeout; | |
2322 | unsigned long flags; | |
2323 | int i, rc = 0; | |
2324 | ||
2325 | /* are we resuming? */ | |
2326 | spin_lock_irqsave(ap->lock, flags); | |
2327 | if (!(ap->pflags & ATA_PFLAG_PM_PENDING) || | |
2328 | ap->pm_mesg.event != PM_EVENT_ON) { | |
2329 | spin_unlock_irqrestore(ap->lock, flags); | |
2330 | return; | |
2331 | } | |
2332 | spin_unlock_irqrestore(ap->lock, flags); | |
2333 | ||
2334 | /* spurious? */ | |
2335 | if (!(ap->pflags & ATA_PFLAG_SUSPENDED)) | |
2336 | goto done; | |
2337 | ||
2338 | if (ap->ops->port_resume) | |
2339 | rc = ap->ops->port_resume(ap); | |
2340 | ||
2341 | /* give devices time to request EH */ | |
2342 | timeout = jiffies + HZ; /* 1s max */ | |
2343 | while (1) { | |
2344 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
2345 | struct ata_device *dev = &ap->device[i]; | |
2346 | unsigned int action = ata_eh_dev_action(dev); | |
2347 | ||
2348 | if ((dev->flags & ATA_DFLAG_SUSPENDED) && | |
2349 | !(action & ATA_EH_RESUME)) | |
2350 | break; | |
2351 | } | |
2352 | ||
2353 | if (i == ATA_MAX_DEVICES || time_after(jiffies, timeout)) | |
2354 | break; | |
2355 | msleep(10); | |
2356 | } | |
2357 | ||
2358 | done: | |
2359 | spin_lock_irqsave(ap->lock, flags); | |
2360 | ap->pflags &= ~(ATA_PFLAG_PM_PENDING | ATA_PFLAG_SUSPENDED); | |
2361 | if (ap->pm_result) { | |
2362 | *ap->pm_result = rc; | |
2363 | ap->pm_result = NULL; | |
2364 | } | |
2365 | spin_unlock_irqrestore(ap->lock, flags); | |
2366 | } |