]>
Commit | Line | Data |
---|---|---|
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 | ||
ad9e2762 | 47 | static void __ata_port_freeze(struct ata_port *ap); |
720ba126 | 48 | static void ata_eh_finish(struct ata_port *ap); |
500530f6 TH |
49 | static void ata_eh_handle_port_suspend(struct ata_port *ap); |
50 | static void ata_eh_handle_port_resume(struct ata_port *ap); | |
ad9e2762 | 51 | |
0c247c55 TH |
52 | static void ata_ering_record(struct ata_ering *ering, int is_io, |
53 | unsigned int err_mask) | |
54 | { | |
55 | struct ata_ering_entry *ent; | |
56 | ||
57 | WARN_ON(!err_mask); | |
58 | ||
59 | ering->cursor++; | |
60 | ering->cursor %= ATA_ERING_SIZE; | |
61 | ||
62 | ent = &ering->ring[ering->cursor]; | |
63 | ent->is_io = is_io; | |
64 | ent->err_mask = err_mask; | |
65 | ent->timestamp = get_jiffies_64(); | |
66 | } | |
67 | ||
68 | static struct ata_ering_entry * ata_ering_top(struct ata_ering *ering) | |
69 | { | |
70 | struct ata_ering_entry *ent = &ering->ring[ering->cursor]; | |
71 | if (!ent->err_mask) | |
72 | return NULL; | |
73 | return ent; | |
74 | } | |
75 | ||
76 | static int ata_ering_map(struct ata_ering *ering, | |
77 | int (*map_fn)(struct ata_ering_entry *, void *), | |
78 | void *arg) | |
79 | { | |
80 | int idx, rc = 0; | |
81 | struct ata_ering_entry *ent; | |
82 | ||
83 | idx = ering->cursor; | |
84 | do { | |
85 | ent = &ering->ring[idx]; | |
86 | if (!ent->err_mask) | |
87 | break; | |
88 | rc = map_fn(ent, arg); | |
89 | if (rc) | |
90 | break; | |
91 | idx = (idx - 1 + ATA_ERING_SIZE) % ATA_ERING_SIZE; | |
92 | } while (idx != ering->cursor); | |
93 | ||
94 | return rc; | |
95 | } | |
96 | ||
64f65ca6 TH |
97 | static unsigned int ata_eh_dev_action(struct ata_device *dev) |
98 | { | |
99 | struct ata_eh_context *ehc = &dev->ap->eh_context; | |
100 | ||
101 | return ehc->i.action | ehc->i.dev_action[dev->devno]; | |
102 | } | |
103 | ||
af181c2d TH |
104 | static void ata_eh_clear_action(struct ata_device *dev, |
105 | struct ata_eh_info *ehi, unsigned int action) | |
106 | { | |
107 | int i; | |
108 | ||
109 | if (!dev) { | |
110 | ehi->action &= ~action; | |
111 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
112 | ehi->dev_action[i] &= ~action; | |
113 | } else { | |
114 | /* doesn't make sense for port-wide EH actions */ | |
115 | WARN_ON(!(action & ATA_EH_PERDEV_MASK)); | |
116 | ||
117 | /* break ehi->action into ehi->dev_action */ | |
118 | if (ehi->action & action) { | |
119 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
120 | ehi->dev_action[i] |= ehi->action & action; | |
121 | ehi->action &= ~action; | |
122 | } | |
123 | ||
124 | /* turn off the specified per-dev action */ | |
125 | ehi->dev_action[dev->devno] &= ~action; | |
126 | } | |
127 | } | |
128 | ||
ece1d636 TH |
129 | /** |
130 | * ata_scsi_timed_out - SCSI layer time out callback | |
131 | * @cmd: timed out SCSI command | |
132 | * | |
133 | * Handles SCSI layer timeout. We race with normal completion of | |
134 | * the qc for @cmd. If the qc is already gone, we lose and let | |
135 | * the scsi command finish (EH_HANDLED). Otherwise, the qc has | |
136 | * timed out and EH should be invoked. Prevent ata_qc_complete() | |
137 | * from finishing it by setting EH_SCHEDULED and return | |
138 | * EH_NOT_HANDLED. | |
139 | * | |
ad9e2762 TH |
140 | * TODO: kill this function once old EH is gone. |
141 | * | |
ece1d636 TH |
142 | * LOCKING: |
143 | * Called from timer context | |
144 | * | |
145 | * RETURNS: | |
146 | * EH_HANDLED or EH_NOT_HANDLED | |
147 | */ | |
148 | enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd) | |
149 | { | |
150 | struct Scsi_Host *host = cmd->device->host; | |
35bb94b1 | 151 | struct ata_port *ap = ata_shost_to_port(host); |
ece1d636 TH |
152 | unsigned long flags; |
153 | struct ata_queued_cmd *qc; | |
ad9e2762 | 154 | enum scsi_eh_timer_return ret; |
ece1d636 TH |
155 | |
156 | DPRINTK("ENTER\n"); | |
157 | ||
ad9e2762 TH |
158 | if (ap->ops->error_handler) { |
159 | ret = EH_NOT_HANDLED; | |
160 | goto out; | |
161 | } | |
162 | ||
163 | ret = EH_HANDLED; | |
ba6a1308 | 164 | spin_lock_irqsave(ap->lock, flags); |
ece1d636 TH |
165 | qc = ata_qc_from_tag(ap, ap->active_tag); |
166 | if (qc) { | |
167 | WARN_ON(qc->scsicmd != cmd); | |
168 | qc->flags |= ATA_QCFLAG_EH_SCHEDULED; | |
169 | qc->err_mask |= AC_ERR_TIMEOUT; | |
170 | ret = EH_NOT_HANDLED; | |
171 | } | |
ba6a1308 | 172 | spin_unlock_irqrestore(ap->lock, flags); |
ece1d636 | 173 | |
ad9e2762 | 174 | out: |
ece1d636 TH |
175 | DPRINTK("EXIT, ret=%d\n", ret); |
176 | return ret; | |
177 | } | |
178 | ||
179 | /** | |
180 | * ata_scsi_error - SCSI layer error handler callback | |
181 | * @host: SCSI host on which error occurred | |
182 | * | |
183 | * Handles SCSI-layer-thrown error events. | |
184 | * | |
185 | * LOCKING: | |
186 | * Inherited from SCSI layer (none, can sleep) | |
187 | * | |
188 | * RETURNS: | |
189 | * Zero. | |
190 | */ | |
381544bb | 191 | void ata_scsi_error(struct Scsi_Host *host) |
ece1d636 | 192 | { |
35bb94b1 | 193 | struct ata_port *ap = ata_shost_to_port(host); |
ad9e2762 TH |
194 | int i, repeat_cnt = ATA_EH_MAX_REPEAT; |
195 | unsigned long flags; | |
ece1d636 TH |
196 | |
197 | DPRINTK("ENTER\n"); | |
198 | ||
ad9e2762 | 199 | /* synchronize with port task */ |
ece1d636 TH |
200 | ata_port_flush_task(ap); |
201 | ||
cca3974e | 202 | /* synchronize with host lock and sort out timeouts */ |
ad9e2762 TH |
203 | |
204 | /* For new EH, all qcs are finished in one of three ways - | |
205 | * normal completion, error completion, and SCSI timeout. | |
206 | * Both cmpletions can race against SCSI timeout. When normal | |
207 | * completion wins, the qc never reaches EH. When error | |
208 | * completion wins, the qc has ATA_QCFLAG_FAILED set. | |
209 | * | |
210 | * When SCSI timeout wins, things are a bit more complex. | |
211 | * Normal or error completion can occur after the timeout but | |
212 | * before this point. In such cases, both types of | |
213 | * completions are honored. A scmd is determined to have | |
214 | * timed out iff its associated qc is active and not failed. | |
215 | */ | |
216 | if (ap->ops->error_handler) { | |
217 | struct scsi_cmnd *scmd, *tmp; | |
218 | int nr_timedout = 0; | |
219 | ||
e30349d2 | 220 | spin_lock_irqsave(ap->lock, flags); |
ad9e2762 TH |
221 | |
222 | list_for_each_entry_safe(scmd, tmp, &host->eh_cmd_q, eh_entry) { | |
223 | struct ata_queued_cmd *qc; | |
224 | ||
225 | for (i = 0; i < ATA_MAX_QUEUE; i++) { | |
226 | qc = __ata_qc_from_tag(ap, i); | |
227 | if (qc->flags & ATA_QCFLAG_ACTIVE && | |
228 | qc->scsicmd == scmd) | |
229 | break; | |
230 | } | |
231 | ||
232 | if (i < ATA_MAX_QUEUE) { | |
233 | /* the scmd has an associated qc */ | |
234 | if (!(qc->flags & ATA_QCFLAG_FAILED)) { | |
235 | /* which hasn't failed yet, timeout */ | |
236 | qc->err_mask |= AC_ERR_TIMEOUT; | |
237 | qc->flags |= ATA_QCFLAG_FAILED; | |
238 | nr_timedout++; | |
239 | } | |
240 | } else { | |
241 | /* Normal completion occurred after | |
242 | * SCSI timeout but before this point. | |
243 | * Successfully complete it. | |
244 | */ | |
245 | scmd->retries = scmd->allowed; | |
246 | scsi_eh_finish_cmd(scmd, &ap->eh_done_q); | |
247 | } | |
248 | } | |
249 | ||
250 | /* If we have timed out qcs. They belong to EH from | |
251 | * this point but the state of the controller is | |
252 | * unknown. Freeze the port to make sure the IRQ | |
253 | * handler doesn't diddle with those qcs. This must | |
254 | * be done atomically w.r.t. setting QCFLAG_FAILED. | |
255 | */ | |
256 | if (nr_timedout) | |
257 | __ata_port_freeze(ap); | |
258 | ||
e30349d2 | 259 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 | 260 | } else |
e30349d2 | 261 | spin_unlock_wait(ap->lock); |
ad9e2762 TH |
262 | |
263 | repeat: | |
264 | /* invoke error handler */ | |
265 | if (ap->ops->error_handler) { | |
500530f6 TH |
266 | /* process port resume request */ |
267 | ata_eh_handle_port_resume(ap); | |
268 | ||
f3e81b19 | 269 | /* fetch & clear EH info */ |
e30349d2 | 270 | spin_lock_irqsave(ap->lock, flags); |
f3e81b19 TH |
271 | |
272 | memset(&ap->eh_context, 0, sizeof(ap->eh_context)); | |
273 | ap->eh_context.i = ap->eh_info; | |
274 | memset(&ap->eh_info, 0, sizeof(ap->eh_info)); | |
275 | ||
b51e9e5d TH |
276 | ap->pflags |= ATA_PFLAG_EH_IN_PROGRESS; |
277 | ap->pflags &= ~ATA_PFLAG_EH_PENDING; | |
f3e81b19 | 278 | |
e30349d2 | 279 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 | 280 | |
500530f6 TH |
281 | /* invoke EH, skip if unloading or suspended */ |
282 | if (!(ap->pflags & (ATA_PFLAG_UNLOADING | ATA_PFLAG_SUSPENDED))) | |
720ba126 TH |
283 | ap->ops->error_handler(ap); |
284 | else | |
285 | ata_eh_finish(ap); | |
ad9e2762 | 286 | |
500530f6 TH |
287 | /* process port suspend request */ |
288 | ata_eh_handle_port_suspend(ap); | |
289 | ||
ad9e2762 TH |
290 | /* Exception might have happend after ->error_handler |
291 | * recovered the port but before this point. Repeat | |
292 | * EH in such case. | |
293 | */ | |
e30349d2 | 294 | spin_lock_irqsave(ap->lock, flags); |
ad9e2762 | 295 | |
b51e9e5d | 296 | if (ap->pflags & ATA_PFLAG_EH_PENDING) { |
ad9e2762 TH |
297 | if (--repeat_cnt) { |
298 | ata_port_printk(ap, KERN_INFO, | |
299 | "EH pending after completion, " | |
300 | "repeating EH (cnt=%d)\n", repeat_cnt); | |
e30349d2 | 301 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 TH |
302 | goto repeat; |
303 | } | |
304 | ata_port_printk(ap, KERN_ERR, "EH pending after %d " | |
305 | "tries, giving up\n", ATA_EH_MAX_REPEAT); | |
306 | } | |
307 | ||
f3e81b19 TH |
308 | /* this run is complete, make sure EH info is clear */ |
309 | memset(&ap->eh_info, 0, sizeof(ap->eh_info)); | |
310 | ||
e30349d2 | 311 | /* Clear host_eh_scheduled while holding ap->lock such |
ad9e2762 TH |
312 | * that if exception occurs after this point but |
313 | * before EH completion, SCSI midlayer will | |
314 | * re-initiate EH. | |
315 | */ | |
316 | host->host_eh_scheduled = 0; | |
317 | ||
e30349d2 | 318 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 TH |
319 | } else { |
320 | WARN_ON(ata_qc_from_tag(ap, ap->active_tag) == NULL); | |
321 | ap->ops->eng_timeout(ap); | |
322 | } | |
ece1d636 | 323 | |
ad9e2762 | 324 | /* finish or retry handled scmd's and clean up */ |
ece1d636 TH |
325 | WARN_ON(host->host_failed || !list_empty(&host->eh_cmd_q)); |
326 | ||
327 | scsi_eh_flush_done_q(&ap->eh_done_q); | |
328 | ||
ad9e2762 | 329 | /* clean up */ |
e30349d2 | 330 | spin_lock_irqsave(ap->lock, flags); |
ad9e2762 | 331 | |
1cdaf534 | 332 | if (ap->pflags & ATA_PFLAG_LOADING) |
b51e9e5d | 333 | ap->pflags &= ~ATA_PFLAG_LOADING; |
1cdaf534 TH |
334 | else if (ap->pflags & ATA_PFLAG_SCSI_HOTPLUG) |
335 | queue_work(ata_aux_wq, &ap->hotplug_task); | |
336 | ||
337 | if (ap->pflags & ATA_PFLAG_RECOVERED) | |
338 | ata_port_printk(ap, KERN_INFO, "EH complete\n"); | |
580b2102 | 339 | |
b51e9e5d | 340 | ap->pflags &= ~(ATA_PFLAG_SCSI_HOTPLUG | ATA_PFLAG_RECOVERED); |
ad9e2762 | 341 | |
c6cf9e99 | 342 | /* tell wait_eh that we're done */ |
b51e9e5d | 343 | ap->pflags &= ~ATA_PFLAG_EH_IN_PROGRESS; |
c6cf9e99 TH |
344 | wake_up_all(&ap->eh_wait_q); |
345 | ||
e30349d2 | 346 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 | 347 | |
ece1d636 | 348 | DPRINTK("EXIT\n"); |
ece1d636 TH |
349 | } |
350 | ||
c6cf9e99 TH |
351 | /** |
352 | * ata_port_wait_eh - Wait for the currently pending EH to complete | |
353 | * @ap: Port to wait EH for | |
354 | * | |
355 | * Wait until the currently pending EH is complete. | |
356 | * | |
357 | * LOCKING: | |
358 | * Kernel thread context (may sleep). | |
359 | */ | |
360 | void ata_port_wait_eh(struct ata_port *ap) | |
361 | { | |
362 | unsigned long flags; | |
363 | DEFINE_WAIT(wait); | |
364 | ||
365 | retry: | |
ba6a1308 | 366 | spin_lock_irqsave(ap->lock, flags); |
c6cf9e99 | 367 | |
b51e9e5d | 368 | while (ap->pflags & (ATA_PFLAG_EH_PENDING | ATA_PFLAG_EH_IN_PROGRESS)) { |
c6cf9e99 | 369 | prepare_to_wait(&ap->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE); |
ba6a1308 | 370 | spin_unlock_irqrestore(ap->lock, flags); |
c6cf9e99 | 371 | schedule(); |
ba6a1308 | 372 | spin_lock_irqsave(ap->lock, flags); |
c6cf9e99 | 373 | } |
0a1b622e | 374 | finish_wait(&ap->eh_wait_q, &wait); |
c6cf9e99 | 375 | |
ba6a1308 | 376 | spin_unlock_irqrestore(ap->lock, flags); |
c6cf9e99 TH |
377 | |
378 | /* make sure SCSI EH is complete */ | |
cca3974e | 379 | if (scsi_host_in_recovery(ap->scsi_host)) { |
c6cf9e99 TH |
380 | msleep(10); |
381 | goto retry; | |
382 | } | |
383 | } | |
384 | ||
ece1d636 TH |
385 | /** |
386 | * ata_qc_timeout - Handle timeout of queued command | |
387 | * @qc: Command that timed out | |
388 | * | |
389 | * Some part of the kernel (currently, only the SCSI layer) | |
390 | * has noticed that the active command on port @ap has not | |
391 | * completed after a specified length of time. Handle this | |
392 | * condition by disabling DMA (if necessary) and completing | |
393 | * transactions, with error if necessary. | |
394 | * | |
395 | * This also handles the case of the "lost interrupt", where | |
396 | * for some reason (possibly hardware bug, possibly driver bug) | |
397 | * an interrupt was not delivered to the driver, even though the | |
398 | * transaction completed successfully. | |
399 | * | |
ad9e2762 TH |
400 | * TODO: kill this function once old EH is gone. |
401 | * | |
ece1d636 TH |
402 | * LOCKING: |
403 | * Inherited from SCSI layer (none, can sleep) | |
404 | */ | |
405 | static void ata_qc_timeout(struct ata_queued_cmd *qc) | |
406 | { | |
407 | struct ata_port *ap = qc->ap; | |
ece1d636 TH |
408 | u8 host_stat = 0, drv_stat; |
409 | unsigned long flags; | |
410 | ||
411 | DPRINTK("ENTER\n"); | |
412 | ||
413 | ap->hsm_task_state = HSM_ST_IDLE; | |
414 | ||
ba6a1308 | 415 | spin_lock_irqsave(ap->lock, flags); |
ece1d636 TH |
416 | |
417 | switch (qc->tf.protocol) { | |
418 | ||
419 | case ATA_PROT_DMA: | |
420 | case ATA_PROT_ATAPI_DMA: | |
421 | host_stat = ap->ops->bmdma_status(ap); | |
422 | ||
423 | /* before we do anything else, clear DMA-Start bit */ | |
424 | ap->ops->bmdma_stop(qc); | |
425 | ||
426 | /* fall through */ | |
427 | ||
428 | default: | |
429 | ata_altstatus(ap); | |
430 | drv_stat = ata_chk_status(ap); | |
431 | ||
432 | /* ack bmdma irq events */ | |
433 | ap->ops->irq_clear(ap); | |
434 | ||
f15a1daf TH |
435 | ata_dev_printk(qc->dev, KERN_ERR, "command 0x%x timeout, " |
436 | "stat 0x%x host_stat 0x%x\n", | |
437 | qc->tf.command, drv_stat, host_stat); | |
ece1d636 TH |
438 | |
439 | /* complete taskfile transaction */ | |
c13b56a1 | 440 | qc->err_mask |= AC_ERR_TIMEOUT; |
ece1d636 TH |
441 | break; |
442 | } | |
443 | ||
ba6a1308 | 444 | spin_unlock_irqrestore(ap->lock, flags); |
ece1d636 TH |
445 | |
446 | ata_eh_qc_complete(qc); | |
447 | ||
448 | DPRINTK("EXIT\n"); | |
449 | } | |
450 | ||
451 | /** | |
452 | * ata_eng_timeout - Handle timeout of queued command | |
453 | * @ap: Port on which timed-out command is active | |
454 | * | |
455 | * Some part of the kernel (currently, only the SCSI layer) | |
456 | * has noticed that the active command on port @ap has not | |
457 | * completed after a specified length of time. Handle this | |
458 | * condition by disabling DMA (if necessary) and completing | |
459 | * transactions, with error if necessary. | |
460 | * | |
461 | * This also handles the case of the "lost interrupt", where | |
462 | * for some reason (possibly hardware bug, possibly driver bug) | |
463 | * an interrupt was not delivered to the driver, even though the | |
464 | * transaction completed successfully. | |
465 | * | |
ad9e2762 TH |
466 | * TODO: kill this function once old EH is gone. |
467 | * | |
ece1d636 TH |
468 | * LOCKING: |
469 | * Inherited from SCSI layer (none, can sleep) | |
470 | */ | |
471 | void ata_eng_timeout(struct ata_port *ap) | |
472 | { | |
473 | DPRINTK("ENTER\n"); | |
474 | ||
475 | ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag)); | |
476 | ||
477 | DPRINTK("EXIT\n"); | |
478 | } | |
479 | ||
f686bcb8 TH |
480 | /** |
481 | * ata_qc_schedule_eh - schedule qc for error handling | |
482 | * @qc: command to schedule error handling for | |
483 | * | |
484 | * Schedule error handling for @qc. EH will kick in as soon as | |
485 | * other commands are drained. | |
486 | * | |
487 | * LOCKING: | |
cca3974e | 488 | * spin_lock_irqsave(host lock) |
f686bcb8 TH |
489 | */ |
490 | void ata_qc_schedule_eh(struct ata_queued_cmd *qc) | |
491 | { | |
492 | struct ata_port *ap = qc->ap; | |
493 | ||
494 | WARN_ON(!ap->ops->error_handler); | |
495 | ||
496 | qc->flags |= ATA_QCFLAG_FAILED; | |
b51e9e5d | 497 | qc->ap->pflags |= ATA_PFLAG_EH_PENDING; |
f686bcb8 TH |
498 | |
499 | /* The following will fail if timeout has already expired. | |
500 | * ata_scsi_error() takes care of such scmds on EH entry. | |
501 | * Note that ATA_QCFLAG_FAILED is unconditionally set after | |
502 | * this function completes. | |
503 | */ | |
504 | scsi_req_abort_cmd(qc->scsicmd); | |
505 | } | |
506 | ||
7b70fc03 TH |
507 | /** |
508 | * ata_port_schedule_eh - schedule error handling without a qc | |
509 | * @ap: ATA port to schedule EH for | |
510 | * | |
511 | * Schedule error handling for @ap. EH will kick in as soon as | |
512 | * all commands are drained. | |
513 | * | |
514 | * LOCKING: | |
cca3974e | 515 | * spin_lock_irqsave(host lock) |
7b70fc03 TH |
516 | */ |
517 | void ata_port_schedule_eh(struct ata_port *ap) | |
518 | { | |
519 | WARN_ON(!ap->ops->error_handler); | |
520 | ||
b51e9e5d | 521 | ap->pflags |= ATA_PFLAG_EH_PENDING; |
cca3974e | 522 | scsi_schedule_eh(ap->scsi_host); |
7b70fc03 TH |
523 | |
524 | DPRINTK("port EH scheduled\n"); | |
525 | } | |
526 | ||
527 | /** | |
528 | * ata_port_abort - abort all qc's on the port | |
529 | * @ap: ATA port to abort qc's for | |
530 | * | |
531 | * Abort all active qc's of @ap and schedule EH. | |
532 | * | |
533 | * LOCKING: | |
cca3974e | 534 | * spin_lock_irqsave(host lock) |
7b70fc03 TH |
535 | * |
536 | * RETURNS: | |
537 | * Number of aborted qc's. | |
538 | */ | |
539 | int ata_port_abort(struct ata_port *ap) | |
540 | { | |
541 | int tag, nr_aborted = 0; | |
542 | ||
543 | WARN_ON(!ap->ops->error_handler); | |
544 | ||
545 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
546 | struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag); | |
547 | ||
548 | if (qc) { | |
549 | qc->flags |= ATA_QCFLAG_FAILED; | |
550 | ata_qc_complete(qc); | |
551 | nr_aborted++; | |
552 | } | |
553 | } | |
554 | ||
555 | if (!nr_aborted) | |
556 | ata_port_schedule_eh(ap); | |
557 | ||
558 | return nr_aborted; | |
559 | } | |
560 | ||
e3180499 TH |
561 | /** |
562 | * __ata_port_freeze - freeze port | |
563 | * @ap: ATA port to freeze | |
564 | * | |
565 | * This function is called when HSM violation or some other | |
566 | * condition disrupts normal operation of the port. Frozen port | |
567 | * is not allowed to perform any operation until the port is | |
568 | * thawed, which usually follows a successful reset. | |
569 | * | |
570 | * ap->ops->freeze() callback can be used for freezing the port | |
571 | * hardware-wise (e.g. mask interrupt and stop DMA engine). If a | |
572 | * port cannot be frozen hardware-wise, the interrupt handler | |
573 | * must ack and clear interrupts unconditionally while the port | |
574 | * is frozen. | |
575 | * | |
576 | * LOCKING: | |
cca3974e | 577 | * spin_lock_irqsave(host lock) |
e3180499 TH |
578 | */ |
579 | static void __ata_port_freeze(struct ata_port *ap) | |
580 | { | |
581 | WARN_ON(!ap->ops->error_handler); | |
582 | ||
583 | if (ap->ops->freeze) | |
584 | ap->ops->freeze(ap); | |
585 | ||
b51e9e5d | 586 | ap->pflags |= ATA_PFLAG_FROZEN; |
e3180499 TH |
587 | |
588 | DPRINTK("ata%u port frozen\n", ap->id); | |
589 | } | |
590 | ||
591 | /** | |
592 | * ata_port_freeze - abort & freeze port | |
593 | * @ap: ATA port to freeze | |
594 | * | |
595 | * Abort and freeze @ap. | |
596 | * | |
597 | * LOCKING: | |
cca3974e | 598 | * spin_lock_irqsave(host lock) |
e3180499 TH |
599 | * |
600 | * RETURNS: | |
601 | * Number of aborted commands. | |
602 | */ | |
603 | int ata_port_freeze(struct ata_port *ap) | |
604 | { | |
605 | int nr_aborted; | |
606 | ||
607 | WARN_ON(!ap->ops->error_handler); | |
608 | ||
609 | nr_aborted = ata_port_abort(ap); | |
610 | __ata_port_freeze(ap); | |
611 | ||
612 | return nr_aborted; | |
613 | } | |
614 | ||
615 | /** | |
616 | * ata_eh_freeze_port - EH helper to freeze port | |
617 | * @ap: ATA port to freeze | |
618 | * | |
619 | * Freeze @ap. | |
620 | * | |
621 | * LOCKING: | |
622 | * None. | |
623 | */ | |
624 | void ata_eh_freeze_port(struct ata_port *ap) | |
625 | { | |
626 | unsigned long flags; | |
627 | ||
628 | if (!ap->ops->error_handler) | |
629 | return; | |
630 | ||
ba6a1308 | 631 | spin_lock_irqsave(ap->lock, flags); |
e3180499 | 632 | __ata_port_freeze(ap); |
ba6a1308 | 633 | spin_unlock_irqrestore(ap->lock, flags); |
e3180499 TH |
634 | } |
635 | ||
636 | /** | |
637 | * ata_port_thaw_port - EH helper to thaw port | |
638 | * @ap: ATA port to thaw | |
639 | * | |
640 | * Thaw frozen port @ap. | |
641 | * | |
642 | * LOCKING: | |
643 | * None. | |
644 | */ | |
645 | void ata_eh_thaw_port(struct ata_port *ap) | |
646 | { | |
647 | unsigned long flags; | |
648 | ||
649 | if (!ap->ops->error_handler) | |
650 | return; | |
651 | ||
ba6a1308 | 652 | spin_lock_irqsave(ap->lock, flags); |
e3180499 | 653 | |
b51e9e5d | 654 | ap->pflags &= ~ATA_PFLAG_FROZEN; |
e3180499 TH |
655 | |
656 | if (ap->ops->thaw) | |
657 | ap->ops->thaw(ap); | |
658 | ||
ba6a1308 | 659 | spin_unlock_irqrestore(ap->lock, flags); |
e3180499 TH |
660 | |
661 | DPRINTK("ata%u port thawed\n", ap->id); | |
662 | } | |
663 | ||
ece1d636 TH |
664 | static void ata_eh_scsidone(struct scsi_cmnd *scmd) |
665 | { | |
666 | /* nada */ | |
667 | } | |
668 | ||
669 | static void __ata_eh_qc_complete(struct ata_queued_cmd *qc) | |
670 | { | |
671 | struct ata_port *ap = qc->ap; | |
672 | struct scsi_cmnd *scmd = qc->scsicmd; | |
673 | unsigned long flags; | |
674 | ||
ba6a1308 | 675 | spin_lock_irqsave(ap->lock, flags); |
ece1d636 TH |
676 | qc->scsidone = ata_eh_scsidone; |
677 | __ata_qc_complete(qc); | |
678 | WARN_ON(ata_tag_valid(qc->tag)); | |
ba6a1308 | 679 | spin_unlock_irqrestore(ap->lock, flags); |
ece1d636 TH |
680 | |
681 | scsi_eh_finish_cmd(scmd, &ap->eh_done_q); | |
682 | } | |
683 | ||
684 | /** | |
685 | * ata_eh_qc_complete - Complete an active ATA command from EH | |
686 | * @qc: Command to complete | |
687 | * | |
688 | * Indicate to the mid and upper layers that an ATA command has | |
689 | * completed. To be used from EH. | |
690 | */ | |
691 | void ata_eh_qc_complete(struct ata_queued_cmd *qc) | |
692 | { | |
693 | struct scsi_cmnd *scmd = qc->scsicmd; | |
694 | scmd->retries = scmd->allowed; | |
695 | __ata_eh_qc_complete(qc); | |
696 | } | |
697 | ||
698 | /** | |
699 | * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH | |
700 | * @qc: Command to retry | |
701 | * | |
702 | * Indicate to the mid and upper layers that an ATA command | |
703 | * should be retried. To be used from EH. | |
704 | * | |
705 | * SCSI midlayer limits the number of retries to scmd->allowed. | |
706 | * scmd->retries is decremented for commands which get retried | |
707 | * due to unrelated failures (qc->err_mask is zero). | |
708 | */ | |
709 | void ata_eh_qc_retry(struct ata_queued_cmd *qc) | |
710 | { | |
711 | struct scsi_cmnd *scmd = qc->scsicmd; | |
712 | if (!qc->err_mask && scmd->retries) | |
713 | scmd->retries--; | |
714 | __ata_eh_qc_complete(qc); | |
715 | } | |
022bdb07 | 716 | |
0ea035a3 TH |
717 | /** |
718 | * ata_eh_detach_dev - detach ATA device | |
719 | * @dev: ATA device to detach | |
720 | * | |
721 | * Detach @dev. | |
722 | * | |
723 | * LOCKING: | |
724 | * None. | |
725 | */ | |
726 | static void ata_eh_detach_dev(struct ata_device *dev) | |
727 | { | |
728 | struct ata_port *ap = dev->ap; | |
729 | unsigned long flags; | |
730 | ||
731 | ata_dev_disable(dev); | |
732 | ||
ba6a1308 | 733 | spin_lock_irqsave(ap->lock, flags); |
0ea035a3 TH |
734 | |
735 | dev->flags &= ~ATA_DFLAG_DETACH; | |
736 | ||
737 | if (ata_scsi_offline_dev(dev)) { | |
738 | dev->flags |= ATA_DFLAG_DETACHED; | |
b51e9e5d | 739 | ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG; |
0ea035a3 TH |
740 | } |
741 | ||
beb07c1a TH |
742 | /* clear per-dev EH actions */ |
743 | ata_eh_clear_action(dev, &ap->eh_info, ATA_EH_PERDEV_MASK); | |
744 | ata_eh_clear_action(dev, &ap->eh_context.i, ATA_EH_PERDEV_MASK); | |
745 | ||
ba6a1308 | 746 | spin_unlock_irqrestore(ap->lock, flags); |
0ea035a3 TH |
747 | } |
748 | ||
022bdb07 TH |
749 | /** |
750 | * ata_eh_about_to_do - about to perform eh_action | |
751 | * @ap: target ATA port | |
47005f25 | 752 | * @dev: target ATA dev for per-dev action (can be NULL) |
022bdb07 TH |
753 | * @action: action about to be performed |
754 | * | |
755 | * Called just before performing EH actions to clear related bits | |
756 | * in @ap->eh_info such that eh actions are not unnecessarily | |
757 | * repeated. | |
758 | * | |
759 | * LOCKING: | |
760 | * None. | |
761 | */ | |
47005f25 TH |
762 | static void ata_eh_about_to_do(struct ata_port *ap, struct ata_device *dev, |
763 | unsigned int action) | |
022bdb07 TH |
764 | { |
765 | unsigned long flags; | |
13abf50d TH |
766 | struct ata_eh_info *ehi = &ap->eh_info; |
767 | struct ata_eh_context *ehc = &ap->eh_context; | |
022bdb07 | 768 | |
ba6a1308 | 769 | spin_lock_irqsave(ap->lock, flags); |
1cdaf534 | 770 | |
13abf50d TH |
771 | /* Reset is represented by combination of actions and EHI |
772 | * flags. Suck in all related bits before clearing eh_info to | |
773 | * avoid losing requested action. | |
774 | */ | |
775 | if (action & ATA_EH_RESET_MASK) { | |
776 | ehc->i.action |= ehi->action & ATA_EH_RESET_MASK; | |
777 | ehc->i.flags |= ehi->flags & ATA_EHI_RESET_MODIFIER_MASK; | |
778 | ||
779 | /* make sure all reset actions are cleared & clear EHI flags */ | |
780 | action |= ATA_EH_RESET_MASK; | |
781 | ehi->flags &= ~ATA_EHI_RESET_MODIFIER_MASK; | |
782 | } | |
783 | ||
784 | ata_eh_clear_action(dev, ehi, action); | |
1cdaf534 | 785 | |
13abf50d | 786 | if (!(ehc->i.flags & ATA_EHI_QUIET)) |
1cdaf534 TH |
787 | ap->pflags |= ATA_PFLAG_RECOVERED; |
788 | ||
ba6a1308 | 789 | spin_unlock_irqrestore(ap->lock, flags); |
022bdb07 TH |
790 | } |
791 | ||
47005f25 TH |
792 | /** |
793 | * ata_eh_done - EH action complete | |
794 | * @ap: target ATA port | |
795 | * @dev: target ATA dev for per-dev action (can be NULL) | |
796 | * @action: action just completed | |
797 | * | |
798 | * Called right after performing EH actions to clear related bits | |
799 | * in @ap->eh_context. | |
800 | * | |
801 | * LOCKING: | |
802 | * None. | |
803 | */ | |
804 | static void ata_eh_done(struct ata_port *ap, struct ata_device *dev, | |
805 | unsigned int action) | |
806 | { | |
13abf50d TH |
807 | /* if reset is complete, clear all reset actions & reset modifier */ |
808 | if (action & ATA_EH_RESET_MASK) { | |
809 | action |= ATA_EH_RESET_MASK; | |
810 | ap->eh_context.i.flags &= ~ATA_EHI_RESET_MODIFIER_MASK; | |
811 | } | |
812 | ||
47005f25 TH |
813 | ata_eh_clear_action(dev, &ap->eh_context.i, action); |
814 | } | |
815 | ||
022bdb07 TH |
816 | /** |
817 | * ata_err_string - convert err_mask to descriptive string | |
818 | * @err_mask: error mask to convert to string | |
819 | * | |
820 | * Convert @err_mask to descriptive string. Errors are | |
821 | * prioritized according to severity and only the most severe | |
822 | * error is reported. | |
823 | * | |
824 | * LOCKING: | |
825 | * None. | |
826 | * | |
827 | * RETURNS: | |
828 | * Descriptive string for @err_mask | |
829 | */ | |
830 | static const char * ata_err_string(unsigned int err_mask) | |
831 | { | |
832 | if (err_mask & AC_ERR_HOST_BUS) | |
833 | return "host bus error"; | |
834 | if (err_mask & AC_ERR_ATA_BUS) | |
835 | return "ATA bus error"; | |
836 | if (err_mask & AC_ERR_TIMEOUT) | |
837 | return "timeout"; | |
838 | if (err_mask & AC_ERR_HSM) | |
839 | return "HSM violation"; | |
840 | if (err_mask & AC_ERR_SYSTEM) | |
841 | return "internal error"; | |
842 | if (err_mask & AC_ERR_MEDIA) | |
843 | return "media error"; | |
844 | if (err_mask & AC_ERR_INVALID) | |
845 | return "invalid argument"; | |
846 | if (err_mask & AC_ERR_DEV) | |
847 | return "device error"; | |
848 | return "unknown error"; | |
849 | } | |
850 | ||
e8ee8451 TH |
851 | /** |
852 | * ata_read_log_page - read a specific log page | |
853 | * @dev: target device | |
854 | * @page: page to read | |
855 | * @buf: buffer to store read page | |
856 | * @sectors: number of sectors to read | |
857 | * | |
858 | * Read log page using READ_LOG_EXT command. | |
859 | * | |
860 | * LOCKING: | |
861 | * Kernel thread context (may sleep). | |
862 | * | |
863 | * RETURNS: | |
864 | * 0 on success, AC_ERR_* mask otherwise. | |
865 | */ | |
866 | static unsigned int ata_read_log_page(struct ata_device *dev, | |
867 | u8 page, void *buf, unsigned int sectors) | |
868 | { | |
869 | struct ata_taskfile tf; | |
870 | unsigned int err_mask; | |
871 | ||
872 | DPRINTK("read log page - page %d\n", page); | |
873 | ||
874 | ata_tf_init(dev, &tf); | |
875 | tf.command = ATA_CMD_READ_LOG_EXT; | |
876 | tf.lbal = page; | |
877 | tf.nsect = sectors; | |
878 | tf.hob_nsect = sectors >> 8; | |
879 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_LBA48 | ATA_TFLAG_DEVICE; | |
880 | tf.protocol = ATA_PROT_PIO; | |
881 | ||
882 | err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE, | |
883 | buf, sectors * ATA_SECT_SIZE); | |
884 | ||
885 | DPRINTK("EXIT, err_mask=%x\n", err_mask); | |
886 | return err_mask; | |
887 | } | |
888 | ||
889 | /** | |
890 | * ata_eh_read_log_10h - Read log page 10h for NCQ error details | |
891 | * @dev: Device to read log page 10h from | |
892 | * @tag: Resulting tag of the failed command | |
893 | * @tf: Resulting taskfile registers of the failed command | |
894 | * | |
895 | * Read log page 10h to obtain NCQ error details and clear error | |
896 | * condition. | |
897 | * | |
898 | * LOCKING: | |
899 | * Kernel thread context (may sleep). | |
900 | * | |
901 | * RETURNS: | |
902 | * 0 on success, -errno otherwise. | |
903 | */ | |
904 | static int ata_eh_read_log_10h(struct ata_device *dev, | |
905 | int *tag, struct ata_taskfile *tf) | |
906 | { | |
907 | u8 *buf = dev->ap->sector_buf; | |
908 | unsigned int err_mask; | |
909 | u8 csum; | |
910 | int i; | |
911 | ||
912 | err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, buf, 1); | |
913 | if (err_mask) | |
914 | return -EIO; | |
915 | ||
916 | csum = 0; | |
917 | for (i = 0; i < ATA_SECT_SIZE; i++) | |
918 | csum += buf[i]; | |
919 | if (csum) | |
920 | ata_dev_printk(dev, KERN_WARNING, | |
921 | "invalid checksum 0x%x on log page 10h\n", csum); | |
922 | ||
923 | if (buf[0] & 0x80) | |
924 | return -ENOENT; | |
925 | ||
926 | *tag = buf[0] & 0x1f; | |
927 | ||
928 | tf->command = buf[2]; | |
929 | tf->feature = buf[3]; | |
930 | tf->lbal = buf[4]; | |
931 | tf->lbam = buf[5]; | |
932 | tf->lbah = buf[6]; | |
933 | tf->device = buf[7]; | |
934 | tf->hob_lbal = buf[8]; | |
935 | tf->hob_lbam = buf[9]; | |
936 | tf->hob_lbah = buf[10]; | |
937 | tf->nsect = buf[12]; | |
938 | tf->hob_nsect = buf[13]; | |
939 | ||
940 | return 0; | |
941 | } | |
942 | ||
022bdb07 TH |
943 | /** |
944 | * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE | |
945 | * @dev: device to perform REQUEST_SENSE to | |
946 | * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long) | |
947 | * | |
948 | * Perform ATAPI REQUEST_SENSE after the device reported CHECK | |
949 | * SENSE. This function is EH helper. | |
950 | * | |
951 | * LOCKING: | |
952 | * Kernel thread context (may sleep). | |
953 | * | |
954 | * RETURNS: | |
955 | * 0 on success, AC_ERR_* mask on failure | |
956 | */ | |
957 | static unsigned int atapi_eh_request_sense(struct ata_device *dev, | |
958 | unsigned char *sense_buf) | |
959 | { | |
960 | struct ata_port *ap = dev->ap; | |
961 | struct ata_taskfile tf; | |
962 | u8 cdb[ATAPI_CDB_LEN]; | |
963 | ||
964 | DPRINTK("ATAPI request sense\n"); | |
965 | ||
966 | ata_tf_init(dev, &tf); | |
967 | ||
968 | /* FIXME: is this needed? */ | |
969 | memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE); | |
970 | ||
971 | /* XXX: why tf_read here? */ | |
972 | ap->ops->tf_read(ap, &tf); | |
973 | ||
974 | /* fill these in, for the case where they are -not- overwritten */ | |
975 | sense_buf[0] = 0x70; | |
976 | sense_buf[2] = tf.feature >> 4; | |
977 | ||
978 | memset(cdb, 0, ATAPI_CDB_LEN); | |
979 | cdb[0] = REQUEST_SENSE; | |
980 | cdb[4] = SCSI_SENSE_BUFFERSIZE; | |
981 | ||
982 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; | |
983 | tf.command = ATA_CMD_PACKET; | |
984 | ||
985 | /* is it pointless to prefer PIO for "safety reasons"? */ | |
986 | if (ap->flags & ATA_FLAG_PIO_DMA) { | |
987 | tf.protocol = ATA_PROT_ATAPI_DMA; | |
988 | tf.feature |= ATAPI_PKT_DMA; | |
989 | } else { | |
990 | tf.protocol = ATA_PROT_ATAPI; | |
991 | tf.lbam = (8 * 1024) & 0xff; | |
992 | tf.lbah = (8 * 1024) >> 8; | |
993 | } | |
994 | ||
995 | return ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE, | |
996 | sense_buf, SCSI_SENSE_BUFFERSIZE); | |
997 | } | |
998 | ||
999 | /** | |
1000 | * ata_eh_analyze_serror - analyze SError for a failed port | |
1001 | * @ap: ATA port to analyze SError for | |
1002 | * | |
1003 | * Analyze SError if available and further determine cause of | |
1004 | * failure. | |
1005 | * | |
1006 | * LOCKING: | |
1007 | * None. | |
1008 | */ | |
1009 | static void ata_eh_analyze_serror(struct ata_port *ap) | |
1010 | { | |
1011 | struct ata_eh_context *ehc = &ap->eh_context; | |
1012 | u32 serror = ehc->i.serror; | |
1013 | unsigned int err_mask = 0, action = 0; | |
1014 | ||
1015 | if (serror & SERR_PERSISTENT) { | |
1016 | err_mask |= AC_ERR_ATA_BUS; | |
1017 | action |= ATA_EH_HARDRESET; | |
1018 | } | |
1019 | if (serror & | |
1020 | (SERR_DATA_RECOVERED | SERR_COMM_RECOVERED | SERR_DATA)) { | |
1021 | err_mask |= AC_ERR_ATA_BUS; | |
1022 | action |= ATA_EH_SOFTRESET; | |
1023 | } | |
1024 | if (serror & SERR_PROTOCOL) { | |
1025 | err_mask |= AC_ERR_HSM; | |
1026 | action |= ATA_EH_SOFTRESET; | |
1027 | } | |
1028 | if (serror & SERR_INTERNAL) { | |
1029 | err_mask |= AC_ERR_SYSTEM; | |
1030 | action |= ATA_EH_SOFTRESET; | |
1031 | } | |
084fe639 TH |
1032 | if (serror & (SERR_PHYRDY_CHG | SERR_DEV_XCHG)) |
1033 | ata_ehi_hotplugged(&ehc->i); | |
022bdb07 TH |
1034 | |
1035 | ehc->i.err_mask |= err_mask; | |
1036 | ehc->i.action |= action; | |
1037 | } | |
1038 | ||
e8ee8451 TH |
1039 | /** |
1040 | * ata_eh_analyze_ncq_error - analyze NCQ error | |
1041 | * @ap: ATA port to analyze NCQ error for | |
1042 | * | |
1043 | * Read log page 10h, determine the offending qc and acquire | |
1044 | * error status TF. For NCQ device errors, all LLDDs have to do | |
1045 | * is setting AC_ERR_DEV in ehi->err_mask. This function takes | |
1046 | * care of the rest. | |
1047 | * | |
1048 | * LOCKING: | |
1049 | * Kernel thread context (may sleep). | |
1050 | */ | |
1051 | static void ata_eh_analyze_ncq_error(struct ata_port *ap) | |
1052 | { | |
1053 | struct ata_eh_context *ehc = &ap->eh_context; | |
1054 | struct ata_device *dev = ap->device; | |
1055 | struct ata_queued_cmd *qc; | |
1056 | struct ata_taskfile tf; | |
1057 | int tag, rc; | |
1058 | ||
1059 | /* if frozen, we can't do much */ | |
b51e9e5d | 1060 | if (ap->pflags & ATA_PFLAG_FROZEN) |
e8ee8451 TH |
1061 | return; |
1062 | ||
1063 | /* is it NCQ device error? */ | |
1064 | if (!ap->sactive || !(ehc->i.err_mask & AC_ERR_DEV)) | |
1065 | return; | |
1066 | ||
1067 | /* has LLDD analyzed already? */ | |
1068 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1069 | qc = __ata_qc_from_tag(ap, tag); | |
1070 | ||
1071 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
1072 | continue; | |
1073 | ||
1074 | if (qc->err_mask) | |
1075 | return; | |
1076 | } | |
1077 | ||
1078 | /* okay, this error is ours */ | |
1079 | rc = ata_eh_read_log_10h(dev, &tag, &tf); | |
1080 | if (rc) { | |
1081 | ata_port_printk(ap, KERN_ERR, "failed to read log page 10h " | |
1082 | "(errno=%d)\n", rc); | |
1083 | return; | |
1084 | } | |
1085 | ||
1086 | if (!(ap->sactive & (1 << tag))) { | |
1087 | ata_port_printk(ap, KERN_ERR, "log page 10h reported " | |
1088 | "inactive tag %d\n", tag); | |
1089 | return; | |
1090 | } | |
1091 | ||
1092 | /* we've got the perpetrator, condemn it */ | |
1093 | qc = __ata_qc_from_tag(ap, tag); | |
1094 | memcpy(&qc->result_tf, &tf, sizeof(tf)); | |
1095 | qc->err_mask |= AC_ERR_DEV; | |
1096 | ehc->i.err_mask &= ~AC_ERR_DEV; | |
1097 | } | |
1098 | ||
022bdb07 TH |
1099 | /** |
1100 | * ata_eh_analyze_tf - analyze taskfile of a failed qc | |
1101 | * @qc: qc to analyze | |
1102 | * @tf: Taskfile registers to analyze | |
1103 | * | |
1104 | * Analyze taskfile of @qc and further determine cause of | |
1105 | * failure. This function also requests ATAPI sense data if | |
1106 | * avaliable. | |
1107 | * | |
1108 | * LOCKING: | |
1109 | * Kernel thread context (may sleep). | |
1110 | * | |
1111 | * RETURNS: | |
1112 | * Determined recovery action | |
1113 | */ | |
1114 | static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd *qc, | |
1115 | const struct ata_taskfile *tf) | |
1116 | { | |
1117 | unsigned int tmp, action = 0; | |
1118 | u8 stat = tf->command, err = tf->feature; | |
1119 | ||
1120 | if ((stat & (ATA_BUSY | ATA_DRQ | ATA_DRDY)) != ATA_DRDY) { | |
1121 | qc->err_mask |= AC_ERR_HSM; | |
1122 | return ATA_EH_SOFTRESET; | |
1123 | } | |
1124 | ||
1125 | if (!(qc->err_mask & AC_ERR_DEV)) | |
1126 | return 0; | |
1127 | ||
1128 | switch (qc->dev->class) { | |
1129 | case ATA_DEV_ATA: | |
1130 | if (err & ATA_ICRC) | |
1131 | qc->err_mask |= AC_ERR_ATA_BUS; | |
1132 | if (err & ATA_UNC) | |
1133 | qc->err_mask |= AC_ERR_MEDIA; | |
1134 | if (err & ATA_IDNF) | |
1135 | qc->err_mask |= AC_ERR_INVALID; | |
1136 | break; | |
1137 | ||
1138 | case ATA_DEV_ATAPI: | |
1139 | tmp = atapi_eh_request_sense(qc->dev, | |
1140 | qc->scsicmd->sense_buffer); | |
1141 | if (!tmp) { | |
1142 | /* ATA_QCFLAG_SENSE_VALID is used to tell | |
1143 | * atapi_qc_complete() that sense data is | |
1144 | * already valid. | |
1145 | * | |
1146 | * TODO: interpret sense data and set | |
1147 | * appropriate err_mask. | |
1148 | */ | |
1149 | qc->flags |= ATA_QCFLAG_SENSE_VALID; | |
1150 | } else | |
1151 | qc->err_mask |= tmp; | |
1152 | } | |
1153 | ||
1154 | if (qc->err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT | AC_ERR_ATA_BUS)) | |
1155 | action |= ATA_EH_SOFTRESET; | |
1156 | ||
1157 | return action; | |
1158 | } | |
1159 | ||
1160 | static int ata_eh_categorize_ering_entry(struct ata_ering_entry *ent) | |
1161 | { | |
1162 | if (ent->err_mask & (AC_ERR_ATA_BUS | AC_ERR_TIMEOUT)) | |
1163 | return 1; | |
1164 | ||
1165 | if (ent->is_io) { | |
1166 | if (ent->err_mask & AC_ERR_HSM) | |
1167 | return 1; | |
1168 | if ((ent->err_mask & | |
1169 | (AC_ERR_DEV|AC_ERR_MEDIA|AC_ERR_INVALID)) == AC_ERR_DEV) | |
1170 | return 2; | |
1171 | } | |
1172 | ||
1173 | return 0; | |
1174 | } | |
1175 | ||
1176 | struct speed_down_needed_arg { | |
1177 | u64 since; | |
1178 | int nr_errors[3]; | |
1179 | }; | |
1180 | ||
1181 | static int speed_down_needed_cb(struct ata_ering_entry *ent, void *void_arg) | |
1182 | { | |
1183 | struct speed_down_needed_arg *arg = void_arg; | |
1184 | ||
1185 | if (ent->timestamp < arg->since) | |
1186 | return -1; | |
1187 | ||
1188 | arg->nr_errors[ata_eh_categorize_ering_entry(ent)]++; | |
1189 | return 0; | |
1190 | } | |
1191 | ||
1192 | /** | |
1193 | * ata_eh_speed_down_needed - Determine wheter speed down is necessary | |
1194 | * @dev: Device of interest | |
1195 | * | |
1196 | * This function examines error ring of @dev and determines | |
1197 | * whether speed down is necessary. Speed down is necessary if | |
1198 | * there have been more than 3 of Cat-1 errors or 10 of Cat-2 | |
1199 | * errors during last 15 minutes. | |
1200 | * | |
1201 | * Cat-1 errors are ATA_BUS, TIMEOUT for any command and HSM | |
1202 | * violation for known supported commands. | |
1203 | * | |
1204 | * Cat-2 errors are unclassified DEV error for known supported | |
1205 | * command. | |
1206 | * | |
1207 | * LOCKING: | |
1208 | * Inherited from caller. | |
1209 | * | |
1210 | * RETURNS: | |
1211 | * 1 if speed down is necessary, 0 otherwise | |
1212 | */ | |
1213 | static int ata_eh_speed_down_needed(struct ata_device *dev) | |
1214 | { | |
1215 | const u64 interval = 15LLU * 60 * HZ; | |
1216 | static const int err_limits[3] = { -1, 3, 10 }; | |
1217 | struct speed_down_needed_arg arg; | |
1218 | struct ata_ering_entry *ent; | |
1219 | int err_cat; | |
1220 | u64 j64; | |
1221 | ||
1222 | ent = ata_ering_top(&dev->ering); | |
1223 | if (!ent) | |
1224 | return 0; | |
1225 | ||
1226 | err_cat = ata_eh_categorize_ering_entry(ent); | |
1227 | if (err_cat == 0) | |
1228 | return 0; | |
1229 | ||
1230 | memset(&arg, 0, sizeof(arg)); | |
1231 | ||
1232 | j64 = get_jiffies_64(); | |
1233 | if (j64 >= interval) | |
1234 | arg.since = j64 - interval; | |
1235 | else | |
1236 | arg.since = 0; | |
1237 | ||
1238 | ata_ering_map(&dev->ering, speed_down_needed_cb, &arg); | |
1239 | ||
1240 | return arg.nr_errors[err_cat] > err_limits[err_cat]; | |
1241 | } | |
1242 | ||
1243 | /** | |
1244 | * ata_eh_speed_down - record error and speed down if necessary | |
1245 | * @dev: Failed device | |
1246 | * @is_io: Did the device fail during normal IO? | |
1247 | * @err_mask: err_mask of the error | |
1248 | * | |
1249 | * Record error and examine error history to determine whether | |
1250 | * adjusting transmission speed is necessary. It also sets | |
1251 | * transmission limits appropriately if such adjustment is | |
1252 | * necessary. | |
1253 | * | |
1254 | * LOCKING: | |
1255 | * Kernel thread context (may sleep). | |
1256 | * | |
1257 | * RETURNS: | |
1258 | * 0 on success, -errno otherwise | |
1259 | */ | |
1260 | static int ata_eh_speed_down(struct ata_device *dev, int is_io, | |
1261 | unsigned int err_mask) | |
1262 | { | |
1263 | if (!err_mask) | |
1264 | return 0; | |
1265 | ||
1266 | /* record error and determine whether speed down is necessary */ | |
1267 | ata_ering_record(&dev->ering, is_io, err_mask); | |
1268 | ||
1269 | if (!ata_eh_speed_down_needed(dev)) | |
1270 | return 0; | |
1271 | ||
1272 | /* speed down SATA link speed if possible */ | |
1273 | if (sata_down_spd_limit(dev->ap) == 0) | |
1274 | return ATA_EH_HARDRESET; | |
1275 | ||
1276 | /* lower transfer mode */ | |
1277 | if (ata_down_xfermask_limit(dev, 0) == 0) | |
1278 | return ATA_EH_SOFTRESET; | |
1279 | ||
1280 | ata_dev_printk(dev, KERN_ERR, | |
1281 | "speed down requested but no transfer mode left\n"); | |
1282 | return 0; | |
1283 | } | |
1284 | ||
1285 | /** | |
1286 | * ata_eh_autopsy - analyze error and determine recovery action | |
1287 | * @ap: ATA port to perform autopsy on | |
1288 | * | |
1289 | * Analyze why @ap failed and determine which recovery action is | |
1290 | * needed. This function also sets more detailed AC_ERR_* values | |
1291 | * and fills sense data for ATAPI CHECK SENSE. | |
1292 | * | |
1293 | * LOCKING: | |
1294 | * Kernel thread context (may sleep). | |
1295 | */ | |
1296 | static void ata_eh_autopsy(struct ata_port *ap) | |
1297 | { | |
1298 | struct ata_eh_context *ehc = &ap->eh_context; | |
022bdb07 TH |
1299 | unsigned int all_err_mask = 0; |
1300 | int tag, is_io = 0; | |
1301 | u32 serror; | |
1302 | int rc; | |
1303 | ||
1304 | DPRINTK("ENTER\n"); | |
1305 | ||
1cdaf534 TH |
1306 | if (ehc->i.flags & ATA_EHI_NO_AUTOPSY) |
1307 | return; | |
1308 | ||
022bdb07 TH |
1309 | /* obtain and analyze SError */ |
1310 | rc = sata_scr_read(ap, SCR_ERROR, &serror); | |
1311 | if (rc == 0) { | |
1312 | ehc->i.serror |= serror; | |
1313 | ata_eh_analyze_serror(ap); | |
1314 | } else if (rc != -EOPNOTSUPP) | |
4528e4da | 1315 | ehc->i.action |= ATA_EH_HARDRESET; |
022bdb07 | 1316 | |
e8ee8451 TH |
1317 | /* analyze NCQ failure */ |
1318 | ata_eh_analyze_ncq_error(ap); | |
1319 | ||
022bdb07 TH |
1320 | /* any real error trumps AC_ERR_OTHER */ |
1321 | if (ehc->i.err_mask & ~AC_ERR_OTHER) | |
1322 | ehc->i.err_mask &= ~AC_ERR_OTHER; | |
1323 | ||
1324 | all_err_mask |= ehc->i.err_mask; | |
1325 | ||
1326 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1327 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
1328 | ||
1329 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
1330 | continue; | |
1331 | ||
1332 | /* inherit upper level err_mask */ | |
1333 | qc->err_mask |= ehc->i.err_mask; | |
1334 | ||
022bdb07 | 1335 | /* analyze TF */ |
4528e4da | 1336 | ehc->i.action |= ata_eh_analyze_tf(qc, &qc->result_tf); |
022bdb07 TH |
1337 | |
1338 | /* DEV errors are probably spurious in case of ATA_BUS error */ | |
1339 | if (qc->err_mask & AC_ERR_ATA_BUS) | |
1340 | qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_MEDIA | | |
1341 | AC_ERR_INVALID); | |
1342 | ||
1343 | /* any real error trumps unknown error */ | |
1344 | if (qc->err_mask & ~AC_ERR_OTHER) | |
1345 | qc->err_mask &= ~AC_ERR_OTHER; | |
1346 | ||
1347 | /* SENSE_VALID trumps dev/unknown error and revalidation */ | |
1348 | if (qc->flags & ATA_QCFLAG_SENSE_VALID) { | |
1349 | qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_OTHER); | |
4528e4da | 1350 | ehc->i.action &= ~ATA_EH_REVALIDATE; |
022bdb07 TH |
1351 | } |
1352 | ||
1353 | /* accumulate error info */ | |
4528e4da | 1354 | ehc->i.dev = qc->dev; |
022bdb07 TH |
1355 | all_err_mask |= qc->err_mask; |
1356 | if (qc->flags & ATA_QCFLAG_IO) | |
1357 | is_io = 1; | |
1358 | } | |
1359 | ||
a20f33ff | 1360 | /* enforce default EH actions */ |
b51e9e5d | 1361 | if (ap->pflags & ATA_PFLAG_FROZEN || |
a20f33ff | 1362 | all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT)) |
4528e4da | 1363 | ehc->i.action |= ATA_EH_SOFTRESET; |
a20f33ff | 1364 | else if (all_err_mask) |
4528e4da | 1365 | ehc->i.action |= ATA_EH_REVALIDATE; |
022bdb07 | 1366 | |
47005f25 | 1367 | /* if we have offending qcs and the associated failed device */ |
4528e4da | 1368 | if (ehc->i.dev) { |
47005f25 | 1369 | /* speed down */ |
4528e4da TH |
1370 | ehc->i.action |= ata_eh_speed_down(ehc->i.dev, is_io, |
1371 | all_err_mask); | |
47005f25 TH |
1372 | |
1373 | /* perform per-dev EH action only on the offending device */ | |
4528e4da TH |
1374 | ehc->i.dev_action[ehc->i.dev->devno] |= |
1375 | ehc->i.action & ATA_EH_PERDEV_MASK; | |
1376 | ehc->i.action &= ~ATA_EH_PERDEV_MASK; | |
47005f25 TH |
1377 | } |
1378 | ||
022bdb07 TH |
1379 | DPRINTK("EXIT\n"); |
1380 | } | |
1381 | ||
1382 | /** | |
1383 | * ata_eh_report - report error handling to user | |
1384 | * @ap: ATA port EH is going on | |
1385 | * | |
1386 | * Report EH to user. | |
1387 | * | |
1388 | * LOCKING: | |
1389 | * None. | |
1390 | */ | |
1391 | static void ata_eh_report(struct ata_port *ap) | |
1392 | { | |
1393 | struct ata_eh_context *ehc = &ap->eh_context; | |
1394 | const char *frozen, *desc; | |
1395 | int tag, nr_failed = 0; | |
1396 | ||
1397 | desc = NULL; | |
1398 | if (ehc->i.desc[0] != '\0') | |
1399 | desc = ehc->i.desc; | |
1400 | ||
1401 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1402 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
1403 | ||
1404 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
1405 | continue; | |
1406 | if (qc->flags & ATA_QCFLAG_SENSE_VALID && !qc->err_mask) | |
1407 | continue; | |
1408 | ||
1409 | nr_failed++; | |
1410 | } | |
1411 | ||
1412 | if (!nr_failed && !ehc->i.err_mask) | |
1413 | return; | |
1414 | ||
1415 | frozen = ""; | |
b51e9e5d | 1416 | if (ap->pflags & ATA_PFLAG_FROZEN) |
022bdb07 TH |
1417 | frozen = " frozen"; |
1418 | ||
1419 | if (ehc->i.dev) { | |
e8ee8451 TH |
1420 | ata_dev_printk(ehc->i.dev, KERN_ERR, "exception Emask 0x%x " |
1421 | "SAct 0x%x SErr 0x%x action 0x%x%s\n", | |
1422 | ehc->i.err_mask, ap->sactive, ehc->i.serror, | |
1423 | ehc->i.action, frozen); | |
022bdb07 TH |
1424 | if (desc) |
1425 | ata_dev_printk(ehc->i.dev, KERN_ERR, "(%s)\n", desc); | |
1426 | } else { | |
e8ee8451 TH |
1427 | ata_port_printk(ap, KERN_ERR, "exception Emask 0x%x " |
1428 | "SAct 0x%x SErr 0x%x action 0x%x%s\n", | |
1429 | ehc->i.err_mask, ap->sactive, ehc->i.serror, | |
1430 | ehc->i.action, frozen); | |
022bdb07 TH |
1431 | if (desc) |
1432 | ata_port_printk(ap, KERN_ERR, "(%s)\n", desc); | |
1433 | } | |
1434 | ||
1435 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1436 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
1437 | ||
1438 | if (!(qc->flags & ATA_QCFLAG_FAILED) || !qc->err_mask) | |
1439 | continue; | |
1440 | ||
1441 | ata_dev_printk(qc->dev, KERN_ERR, "tag %d cmd 0x%x " | |
1442 | "Emask 0x%x stat 0x%x err 0x%x (%s)\n", | |
1443 | qc->tag, qc->tf.command, qc->err_mask, | |
1444 | qc->result_tf.command, qc->result_tf.feature, | |
1445 | ata_err_string(qc->err_mask)); | |
1446 | } | |
1447 | } | |
1448 | ||
d87fa38e TH |
1449 | static int ata_do_reset(struct ata_port *ap, ata_reset_fn_t reset, |
1450 | unsigned int *classes) | |
1451 | { | |
1452 | int i, rc; | |
1453 | ||
1454 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1455 | classes[i] = ATA_DEV_UNKNOWN; | |
1456 | ||
1457 | rc = reset(ap, classes); | |
1458 | if (rc) | |
1459 | return rc; | |
1460 | ||
1461 | /* If any class isn't ATA_DEV_UNKNOWN, consider classification | |
1462 | * is complete and convert all ATA_DEV_UNKNOWN to | |
1463 | * ATA_DEV_NONE. | |
1464 | */ | |
1465 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1466 | if (classes[i] != ATA_DEV_UNKNOWN) | |
1467 | break; | |
1468 | ||
1469 | if (i < ATA_MAX_DEVICES) | |
1470 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1471 | if (classes[i] == ATA_DEV_UNKNOWN) | |
1472 | classes[i] = ATA_DEV_NONE; | |
1473 | ||
1474 | return 0; | |
1475 | } | |
1476 | ||
664faf09 TH |
1477 | static int ata_eh_followup_srst_needed(int rc, int classify, |
1478 | const unsigned int *classes) | |
1479 | { | |
1480 | if (rc == -EAGAIN) | |
1481 | return 1; | |
1482 | if (rc != 0) | |
1483 | return 0; | |
1484 | if (classify && classes[0] == ATA_DEV_UNKNOWN) | |
1485 | return 1; | |
1486 | return 0; | |
1487 | } | |
1488 | ||
1489 | static int ata_eh_reset(struct ata_port *ap, int classify, | |
f5914a46 | 1490 | ata_prereset_fn_t prereset, ata_reset_fn_t softreset, |
022bdb07 TH |
1491 | ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) |
1492 | { | |
1493 | struct ata_eh_context *ehc = &ap->eh_context; | |
664faf09 | 1494 | unsigned int *classes = ehc->classes; |
022bdb07 | 1495 | int tries = ATA_EH_RESET_TRIES; |
1cdaf534 | 1496 | int verbose = !(ehc->i.flags & ATA_EHI_QUIET); |
f5914a46 | 1497 | unsigned int action; |
022bdb07 | 1498 | ata_reset_fn_t reset; |
664faf09 | 1499 | int i, did_followup_srst, rc; |
022bdb07 | 1500 | |
13abf50d TH |
1501 | /* about to reset */ |
1502 | ata_eh_about_to_do(ap, NULL, ehc->i.action & ATA_EH_RESET_MASK); | |
1503 | ||
f5914a46 TH |
1504 | /* Determine which reset to use and record in ehc->i.action. |
1505 | * prereset() may examine and modify it. | |
1506 | */ | |
1507 | action = ehc->i.action; | |
1508 | ehc->i.action &= ~ATA_EH_RESET_MASK; | |
022bdb07 | 1509 | if (softreset && (!hardreset || (!sata_set_spd_needed(ap) && |
f5914a46 TH |
1510 | !(action & ATA_EH_HARDRESET)))) |
1511 | ehc->i.action |= ATA_EH_SOFTRESET; | |
022bdb07 | 1512 | else |
f5914a46 TH |
1513 | ehc->i.action |= ATA_EH_HARDRESET; |
1514 | ||
1515 | if (prereset) { | |
1516 | rc = prereset(ap); | |
1517 | if (rc) { | |
1518 | ata_port_printk(ap, KERN_ERR, | |
1519 | "prereset failed (errno=%d)\n", rc); | |
1520 | return rc; | |
1521 | } | |
1522 | } | |
1523 | ||
1524 | /* prereset() might have modified ehc->i.action */ | |
1525 | if (ehc->i.action & ATA_EH_HARDRESET) | |
022bdb07 | 1526 | reset = hardreset; |
f5914a46 TH |
1527 | else if (ehc->i.action & ATA_EH_SOFTRESET) |
1528 | reset = softreset; | |
1529 | else { | |
1530 | /* prereset told us not to reset, bang classes and return */ | |
1531 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1532 | classes[i] = ATA_DEV_NONE; | |
1533 | return 0; | |
1534 | } | |
1535 | ||
1536 | /* did prereset() screw up? if so, fix up to avoid oopsing */ | |
1537 | if (!reset) { | |
1538 | ata_port_printk(ap, KERN_ERR, "BUG: prereset() requested " | |
1539 | "invalid reset type\n"); | |
1540 | if (softreset) | |
1541 | reset = softreset; | |
1542 | else | |
1543 | reset = hardreset; | |
1544 | } | |
022bdb07 TH |
1545 | |
1546 | retry: | |
3e706399 TH |
1547 | /* shut up during boot probing */ |
1548 | if (verbose) | |
1549 | ata_port_printk(ap, KERN_INFO, "%s resetting port\n", | |
1550 | reset == softreset ? "soft" : "hard"); | |
022bdb07 | 1551 | |
13abf50d | 1552 | /* mark that this EH session started with reset */ |
022bdb07 TH |
1553 | ehc->i.flags |= ATA_EHI_DID_RESET; |
1554 | ||
1555 | rc = ata_do_reset(ap, reset, classes); | |
1556 | ||
664faf09 TH |
1557 | did_followup_srst = 0; |
1558 | if (reset == hardreset && | |
1559 | ata_eh_followup_srst_needed(rc, classify, classes)) { | |
1560 | /* okay, let's do follow-up softreset */ | |
1561 | did_followup_srst = 1; | |
1562 | reset = softreset; | |
1563 | ||
1564 | if (!reset) { | |
1565 | ata_port_printk(ap, KERN_ERR, | |
1566 | "follow-up softreset required " | |
1567 | "but no softreset avaliable\n"); | |
1568 | return -EINVAL; | |
1569 | } | |
1570 | ||
47005f25 | 1571 | ata_eh_about_to_do(ap, NULL, ATA_EH_RESET_MASK); |
664faf09 TH |
1572 | rc = ata_do_reset(ap, reset, classes); |
1573 | ||
1574 | if (rc == 0 && classify && | |
1575 | classes[0] == ATA_DEV_UNKNOWN) { | |
1576 | ata_port_printk(ap, KERN_ERR, | |
1577 | "classification failed\n"); | |
1578 | return -EINVAL; | |
1579 | } | |
1580 | } | |
1581 | ||
022bdb07 | 1582 | if (rc && --tries) { |
664faf09 TH |
1583 | const char *type; |
1584 | ||
1585 | if (reset == softreset) { | |
1586 | if (did_followup_srst) | |
1587 | type = "follow-up soft"; | |
1588 | else | |
1589 | type = "soft"; | |
1590 | } else | |
1591 | type = "hard"; | |
1592 | ||
022bdb07 | 1593 | ata_port_printk(ap, KERN_WARNING, |
664faf09 | 1594 | "%sreset failed, retrying in 5 secs\n", type); |
022bdb07 TH |
1595 | ssleep(5); |
1596 | ||
1597 | if (reset == hardreset) | |
1598 | sata_down_spd_limit(ap); | |
1599 | if (hardreset) | |
1600 | reset = hardreset; | |
1601 | goto retry; | |
1602 | } | |
1603 | ||
1604 | if (rc == 0) { | |
20952b69 TH |
1605 | /* After the reset, the device state is PIO 0 and the |
1606 | * controller state is undefined. Record the mode. | |
1607 | */ | |
1608 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1609 | ap->device[i].pio_mode = XFER_PIO_0; | |
1610 | ||
022bdb07 TH |
1611 | if (postreset) |
1612 | postreset(ap, classes); | |
1613 | ||
1614 | /* reset successful, schedule revalidation */ | |
13abf50d | 1615 | ata_eh_done(ap, NULL, ehc->i.action & ATA_EH_RESET_MASK); |
022bdb07 TH |
1616 | ehc->i.action |= ATA_EH_REVALIDATE; |
1617 | } | |
1618 | ||
1619 | return rc; | |
1620 | } | |
1621 | ||
084fe639 TH |
1622 | static int ata_eh_revalidate_and_attach(struct ata_port *ap, |
1623 | struct ata_device **r_failed_dev) | |
022bdb07 TH |
1624 | { |
1625 | struct ata_eh_context *ehc = &ap->eh_context; | |
1626 | struct ata_device *dev; | |
084fe639 | 1627 | unsigned long flags; |
022bdb07 TH |
1628 | int i, rc = 0; |
1629 | ||
1630 | DPRINTK("ENTER\n"); | |
1631 | ||
1632 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
47005f25 TH |
1633 | unsigned int action; |
1634 | ||
022bdb07 | 1635 | dev = &ap->device[i]; |
64f65ca6 | 1636 | action = ata_eh_dev_action(dev); |
022bdb07 | 1637 | |
02670bf3 | 1638 | if (action & ATA_EH_REVALIDATE && ata_dev_ready(dev)) { |
022bdb07 TH |
1639 | if (ata_port_offline(ap)) { |
1640 | rc = -EIO; | |
1641 | break; | |
1642 | } | |
1643 | ||
47005f25 | 1644 | ata_eh_about_to_do(ap, dev, ATA_EH_REVALIDATE); |
022bdb07 TH |
1645 | rc = ata_dev_revalidate(dev, |
1646 | ehc->i.flags & ATA_EHI_DID_RESET); | |
1647 | if (rc) | |
1648 | break; | |
1649 | ||
47005f25 TH |
1650 | ata_eh_done(ap, dev, ATA_EH_REVALIDATE); |
1651 | ||
3057ac3c | 1652 | /* schedule the scsi_rescan_device() here */ |
1653 | queue_work(ata_aux_wq, &(ap->scsi_rescan_task)); | |
084fe639 TH |
1654 | } else if (dev->class == ATA_DEV_UNKNOWN && |
1655 | ehc->tries[dev->devno] && | |
1656 | ata_class_enabled(ehc->classes[dev->devno])) { | |
1657 | dev->class = ehc->classes[dev->devno]; | |
1658 | ||
1659 | rc = ata_dev_read_id(dev, &dev->class, 1, dev->id); | |
1660 | if (rc == 0) | |
1661 | rc = ata_dev_configure(dev, 1); | |
1662 | ||
1663 | if (rc) { | |
1664 | dev->class = ATA_DEV_UNKNOWN; | |
1665 | break; | |
1666 | } | |
1667 | ||
ba6a1308 | 1668 | spin_lock_irqsave(ap->lock, flags); |
b51e9e5d | 1669 | ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG; |
ba6a1308 | 1670 | spin_unlock_irqrestore(ap->lock, flags); |
022bdb07 TH |
1671 | } |
1672 | } | |
1673 | ||
47005f25 | 1674 | if (rc) |
022bdb07 TH |
1675 | *r_failed_dev = dev; |
1676 | ||
1677 | DPRINTK("EXIT\n"); | |
1678 | return rc; | |
1679 | } | |
1680 | ||
02670bf3 TH |
1681 | /** |
1682 | * ata_eh_suspend - handle suspend EH action | |
1683 | * @ap: target host port | |
1684 | * @r_failed_dev: result parameter to indicate failing device | |
1685 | * | |
1686 | * Handle suspend EH action. Disk devices are spinned down and | |
1687 | * other types of devices are just marked suspended. Once | |
1688 | * suspended, no EH action to the device is allowed until it is | |
1689 | * resumed. | |
1690 | * | |
1691 | * LOCKING: | |
1692 | * Kernel thread context (may sleep). | |
1693 | * | |
1694 | * RETURNS: | |
1695 | * 0 on success, -errno otherwise | |
1696 | */ | |
1697 | static int ata_eh_suspend(struct ata_port *ap, struct ata_device **r_failed_dev) | |
1698 | { | |
1699 | struct ata_device *dev; | |
1700 | int i, rc = 0; | |
1701 | ||
1702 | DPRINTK("ENTER\n"); | |
1703 | ||
1704 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
1705 | unsigned long flags; | |
1706 | unsigned int action, err_mask; | |
1707 | ||
1708 | dev = &ap->device[i]; | |
1709 | action = ata_eh_dev_action(dev); | |
1710 | ||
1711 | if (!ata_dev_enabled(dev) || !(action & ATA_EH_SUSPEND)) | |
1712 | continue; | |
1713 | ||
1714 | WARN_ON(dev->flags & ATA_DFLAG_SUSPENDED); | |
1715 | ||
1716 | ata_eh_about_to_do(ap, dev, ATA_EH_SUSPEND); | |
1717 | ||
1718 | if (dev->class == ATA_DEV_ATA && !(action & ATA_EH_PM_FREEZE)) { | |
1719 | /* flush cache */ | |
1720 | rc = ata_flush_cache(dev); | |
1721 | if (rc) | |
1722 | break; | |
1723 | ||
1724 | /* spin down */ | |
1725 | err_mask = ata_do_simple_cmd(dev, ATA_CMD_STANDBYNOW1); | |
1726 | if (err_mask) { | |
1727 | ata_dev_printk(dev, KERN_ERR, "failed to " | |
1728 | "spin down (err_mask=0x%x)\n", | |
1729 | err_mask); | |
1730 | rc = -EIO; | |
1731 | break; | |
1732 | } | |
1733 | } | |
1734 | ||
1735 | spin_lock_irqsave(ap->lock, flags); | |
1736 | dev->flags |= ATA_DFLAG_SUSPENDED; | |
1737 | spin_unlock_irqrestore(ap->lock, flags); | |
1738 | ||
1739 | ata_eh_done(ap, dev, ATA_EH_SUSPEND); | |
1740 | } | |
1741 | ||
1742 | if (rc) | |
1743 | *r_failed_dev = dev; | |
1744 | ||
1745 | DPRINTK("EXIT\n"); | |
1746 | return 0; | |
1747 | } | |
1748 | ||
1749 | /** | |
1750 | * ata_eh_prep_resume - prep for resume EH action | |
1751 | * @ap: target host port | |
1752 | * | |
1753 | * Clear SUSPENDED in preparation for scheduled resume actions. | |
1754 | * This allows other parts of EH to access the devices being | |
1755 | * resumed. | |
1756 | * | |
1757 | * LOCKING: | |
1758 | * Kernel thread context (may sleep). | |
1759 | */ | |
1760 | static void ata_eh_prep_resume(struct ata_port *ap) | |
1761 | { | |
1762 | struct ata_device *dev; | |
1763 | unsigned long flags; | |
1764 | int i; | |
1765 | ||
1766 | DPRINTK("ENTER\n"); | |
1767 | ||
1768 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
1769 | unsigned int action; | |
1770 | ||
1771 | dev = &ap->device[i]; | |
1772 | action = ata_eh_dev_action(dev); | |
1773 | ||
1774 | if (!ata_dev_enabled(dev) || !(action & ATA_EH_RESUME)) | |
1775 | continue; | |
1776 | ||
1777 | spin_lock_irqsave(ap->lock, flags); | |
1778 | dev->flags &= ~ATA_DFLAG_SUSPENDED; | |
1779 | spin_unlock_irqrestore(ap->lock, flags); | |
1780 | } | |
1781 | ||
1782 | DPRINTK("EXIT\n"); | |
1783 | } | |
1784 | ||
1785 | /** | |
1786 | * ata_eh_resume - handle resume EH action | |
1787 | * @ap: target host port | |
1788 | * @r_failed_dev: result parameter to indicate failing device | |
1789 | * | |
1790 | * Handle resume EH action. Target devices are already reset and | |
1791 | * revalidated. Spinning up is the only operation left. | |
1792 | * | |
1793 | * LOCKING: | |
1794 | * Kernel thread context (may sleep). | |
1795 | * | |
1796 | * RETURNS: | |
1797 | * 0 on success, -errno otherwise | |
1798 | */ | |
1799 | static int ata_eh_resume(struct ata_port *ap, struct ata_device **r_failed_dev) | |
1800 | { | |
1801 | struct ata_device *dev; | |
1802 | int i, rc = 0; | |
1803 | ||
1804 | DPRINTK("ENTER\n"); | |
1805 | ||
1806 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
1807 | unsigned int action, err_mask; | |
1808 | ||
1809 | dev = &ap->device[i]; | |
1810 | action = ata_eh_dev_action(dev); | |
1811 | ||
1812 | if (!ata_dev_enabled(dev) || !(action & ATA_EH_RESUME)) | |
1813 | continue; | |
1814 | ||
1815 | ata_eh_about_to_do(ap, dev, ATA_EH_RESUME); | |
1816 | ||
1817 | if (dev->class == ATA_DEV_ATA && !(action & ATA_EH_PM_FREEZE)) { | |
1818 | err_mask = ata_do_simple_cmd(dev, | |
1819 | ATA_CMD_IDLEIMMEDIATE); | |
1820 | if (err_mask) { | |
1821 | ata_dev_printk(dev, KERN_ERR, "failed to " | |
1822 | "spin up (err_mask=0x%x)\n", | |
1823 | err_mask); | |
1824 | rc = -EIO; | |
1825 | break; | |
1826 | } | |
1827 | } | |
1828 | ||
1829 | ata_eh_done(ap, dev, ATA_EH_RESUME); | |
1830 | } | |
1831 | ||
1832 | if (rc) | |
1833 | *r_failed_dev = dev; | |
1834 | ||
1835 | DPRINTK("EXIT\n"); | |
1836 | return 0; | |
1837 | } | |
1838 | ||
022bdb07 TH |
1839 | static int ata_port_nr_enabled(struct ata_port *ap) |
1840 | { | |
1841 | int i, cnt = 0; | |
1842 | ||
1843 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1844 | if (ata_dev_enabled(&ap->device[i])) | |
1845 | cnt++; | |
1846 | return cnt; | |
1847 | } | |
1848 | ||
084fe639 TH |
1849 | static int ata_port_nr_vacant(struct ata_port *ap) |
1850 | { | |
1851 | int i, cnt = 0; | |
1852 | ||
1853 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1854 | if (ap->device[i].class == ATA_DEV_UNKNOWN) | |
1855 | cnt++; | |
1856 | return cnt; | |
1857 | } | |
1858 | ||
1859 | static int ata_eh_skip_recovery(struct ata_port *ap) | |
1860 | { | |
1861 | struct ata_eh_context *ehc = &ap->eh_context; | |
1862 | int i; | |
1863 | ||
02670bf3 TH |
1864 | /* skip if all possible devices are suspended */ |
1865 | for (i = 0; i < ata_port_max_devices(ap); i++) { | |
1866 | struct ata_device *dev = &ap->device[i]; | |
1867 | ||
7c8c2cff | 1868 | if (!(dev->flags & ATA_DFLAG_SUSPENDED)) |
02670bf3 TH |
1869 | break; |
1870 | } | |
1871 | ||
1872 | if (i == ata_port_max_devices(ap)) | |
1873 | return 1; | |
1874 | ||
7c8c2cff TH |
1875 | /* thaw frozen port, resume link and recover failed devices */ |
1876 | if ((ap->pflags & ATA_PFLAG_FROZEN) || | |
1877 | (ehc->i.flags & ATA_EHI_RESUME_LINK) || ata_port_nr_enabled(ap)) | |
084fe639 TH |
1878 | return 0; |
1879 | ||
1880 | /* skip if class codes for all vacant slots are ATA_DEV_NONE */ | |
1881 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
1882 | struct ata_device *dev = &ap->device[i]; | |
1883 | ||
1884 | if (dev->class == ATA_DEV_UNKNOWN && | |
1885 | ehc->classes[dev->devno] != ATA_DEV_NONE) | |
1886 | return 0; | |
1887 | } | |
1888 | ||
1889 | return 1; | |
1890 | } | |
1891 | ||
022bdb07 TH |
1892 | /** |
1893 | * ata_eh_recover - recover host port after error | |
1894 | * @ap: host port to recover | |
f5914a46 | 1895 | * @prereset: prereset method (can be NULL) |
022bdb07 TH |
1896 | * @softreset: softreset method (can be NULL) |
1897 | * @hardreset: hardreset method (can be NULL) | |
1898 | * @postreset: postreset method (can be NULL) | |
1899 | * | |
1900 | * This is the alpha and omega, eum and yang, heart and soul of | |
1901 | * libata exception handling. On entry, actions required to | |
084fe639 TH |
1902 | * recover the port and hotplug requests are recorded in |
1903 | * eh_context. This function executes all the operations with | |
1904 | * appropriate retrials and fallbacks to resurrect failed | |
1905 | * devices, detach goners and greet newcomers. | |
022bdb07 TH |
1906 | * |
1907 | * LOCKING: | |
1908 | * Kernel thread context (may sleep). | |
1909 | * | |
1910 | * RETURNS: | |
1911 | * 0 on success, -errno on failure. | |
1912 | */ | |
f5914a46 TH |
1913 | static int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset, |
1914 | ata_reset_fn_t softreset, ata_reset_fn_t hardreset, | |
022bdb07 TH |
1915 | ata_postreset_fn_t postreset) |
1916 | { | |
1917 | struct ata_eh_context *ehc = &ap->eh_context; | |
1918 | struct ata_device *dev; | |
1919 | int down_xfermask, i, rc; | |
1920 | ||
1921 | DPRINTK("ENTER\n"); | |
1922 | ||
1923 | /* prep for recovery */ | |
1924 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
1925 | dev = &ap->device[i]; | |
1926 | ||
1927 | ehc->tries[dev->devno] = ATA_EH_DEV_TRIES; | |
084fe639 TH |
1928 | |
1929 | /* process hotplug request */ | |
1930 | if (dev->flags & ATA_DFLAG_DETACH) | |
1931 | ata_eh_detach_dev(dev); | |
1932 | ||
1933 | if (!ata_dev_enabled(dev) && | |
1934 | ((ehc->i.probe_mask & (1 << dev->devno)) && | |
1935 | !(ehc->did_probe_mask & (1 << dev->devno)))) { | |
1936 | ata_eh_detach_dev(dev); | |
1937 | ata_dev_init(dev); | |
1938 | ehc->did_probe_mask |= (1 << dev->devno); | |
1939 | ehc->i.action |= ATA_EH_SOFTRESET; | |
1940 | } | |
022bdb07 TH |
1941 | } |
1942 | ||
1943 | retry: | |
1944 | down_xfermask = 0; | |
1945 | rc = 0; | |
1946 | ||
aeb2ecd6 | 1947 | /* if UNLOADING, finish immediately */ |
b51e9e5d | 1948 | if (ap->pflags & ATA_PFLAG_UNLOADING) |
aeb2ecd6 TH |
1949 | goto out; |
1950 | ||
02670bf3 TH |
1951 | /* prep for resume */ |
1952 | ata_eh_prep_resume(ap); | |
1953 | ||
022bdb07 | 1954 | /* skip EH if possible. */ |
084fe639 | 1955 | if (ata_eh_skip_recovery(ap)) |
022bdb07 TH |
1956 | ehc->i.action = 0; |
1957 | ||
084fe639 TH |
1958 | for (i = 0; i < ATA_MAX_DEVICES; i++) |
1959 | ehc->classes[i] = ATA_DEV_UNKNOWN; | |
1960 | ||
022bdb07 TH |
1961 | /* reset */ |
1962 | if (ehc->i.action & ATA_EH_RESET_MASK) { | |
1963 | ata_eh_freeze_port(ap); | |
1964 | ||
084fe639 TH |
1965 | rc = ata_eh_reset(ap, ata_port_nr_vacant(ap), prereset, |
1966 | softreset, hardreset, postreset); | |
022bdb07 TH |
1967 | if (rc) { |
1968 | ata_port_printk(ap, KERN_ERR, | |
1969 | "reset failed, giving up\n"); | |
1970 | goto out; | |
1971 | } | |
1972 | ||
1973 | ata_eh_thaw_port(ap); | |
1974 | } | |
1975 | ||
084fe639 TH |
1976 | /* revalidate existing devices and attach new ones */ |
1977 | rc = ata_eh_revalidate_and_attach(ap, &dev); | |
022bdb07 TH |
1978 | if (rc) |
1979 | goto dev_fail; | |
1980 | ||
02670bf3 TH |
1981 | /* resume devices */ |
1982 | rc = ata_eh_resume(ap, &dev); | |
1983 | if (rc) | |
1984 | goto dev_fail; | |
1985 | ||
022bdb07 TH |
1986 | /* configure transfer mode if the port has been reset */ |
1987 | if (ehc->i.flags & ATA_EHI_DID_RESET) { | |
1988 | rc = ata_set_mode(ap, &dev); | |
1989 | if (rc) { | |
1990 | down_xfermask = 1; | |
1991 | goto dev_fail; | |
1992 | } | |
1993 | } | |
1994 | ||
02670bf3 TH |
1995 | /* suspend devices */ |
1996 | rc = ata_eh_suspend(ap, &dev); | |
1997 | if (rc) | |
1998 | goto dev_fail; | |
1999 | ||
022bdb07 TH |
2000 | goto out; |
2001 | ||
2002 | dev_fail: | |
2003 | switch (rc) { | |
2004 | case -ENODEV: | |
084fe639 TH |
2005 | /* device missing, schedule probing */ |
2006 | ehc->i.probe_mask |= (1 << dev->devno); | |
022bdb07 TH |
2007 | case -EINVAL: |
2008 | ehc->tries[dev->devno] = 0; | |
2009 | break; | |
2010 | case -EIO: | |
2011 | sata_down_spd_limit(ap); | |
2012 | default: | |
2013 | ehc->tries[dev->devno]--; | |
2014 | if (down_xfermask && | |
2015 | ata_down_xfermask_limit(dev, ehc->tries[dev->devno] == 1)) | |
2016 | ehc->tries[dev->devno] = 0; | |
2017 | } | |
2018 | ||
084fe639 TH |
2019 | if (ata_dev_enabled(dev) && !ehc->tries[dev->devno]) { |
2020 | /* disable device if it has used up all its chances */ | |
022bdb07 TH |
2021 | ata_dev_disable(dev); |
2022 | ||
084fe639 TH |
2023 | /* detach if offline */ |
2024 | if (ata_port_offline(ap)) | |
2025 | ata_eh_detach_dev(dev); | |
2026 | ||
2027 | /* probe if requested */ | |
2028 | if ((ehc->i.probe_mask & (1 << dev->devno)) && | |
2029 | !(ehc->did_probe_mask & (1 << dev->devno))) { | |
2030 | ata_eh_detach_dev(dev); | |
2031 | ata_dev_init(dev); | |
2032 | ||
2033 | ehc->tries[dev->devno] = ATA_EH_DEV_TRIES; | |
2034 | ehc->did_probe_mask |= (1 << dev->devno); | |
2035 | ehc->i.action |= ATA_EH_SOFTRESET; | |
2036 | } | |
2037 | } else { | |
2038 | /* soft didn't work? be haaaaard */ | |
2039 | if (ehc->i.flags & ATA_EHI_DID_RESET) | |
2040 | ehc->i.action |= ATA_EH_HARDRESET; | |
2041 | else | |
2042 | ehc->i.action |= ATA_EH_SOFTRESET; | |
2043 | } | |
022bdb07 TH |
2044 | |
2045 | if (ata_port_nr_enabled(ap)) { | |
2046 | ata_port_printk(ap, KERN_WARNING, "failed to recover some " | |
2047 | "devices, retrying in 5 secs\n"); | |
2048 | ssleep(5); | |
2049 | } else { | |
2050 | /* no device left, repeat fast */ | |
2051 | msleep(500); | |
2052 | } | |
2053 | ||
2054 | goto retry; | |
2055 | ||
2056 | out: | |
2057 | if (rc) { | |
2058 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
2059 | ata_dev_disable(&ap->device[i]); | |
2060 | } | |
2061 | ||
2062 | DPRINTK("EXIT, rc=%d\n", rc); | |
2063 | return rc; | |
2064 | } | |
2065 | ||
2066 | /** | |
2067 | * ata_eh_finish - finish up EH | |
2068 | * @ap: host port to finish EH for | |
2069 | * | |
2070 | * Recovery is complete. Clean up EH states and retry or finish | |
2071 | * failed qcs. | |
2072 | * | |
2073 | * LOCKING: | |
2074 | * None. | |
2075 | */ | |
2076 | static void ata_eh_finish(struct ata_port *ap) | |
2077 | { | |
2078 | int tag; | |
2079 | ||
2080 | /* retry or finish qcs */ | |
2081 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
2082 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
2083 | ||
2084 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
2085 | continue; | |
2086 | ||
2087 | if (qc->err_mask) { | |
2088 | /* FIXME: Once EH migration is complete, | |
2089 | * generate sense data in this function, | |
2090 | * considering both err_mask and tf. | |
2091 | */ | |
2092 | if (qc->err_mask & AC_ERR_INVALID) | |
2093 | ata_eh_qc_complete(qc); | |
2094 | else | |
2095 | ata_eh_qc_retry(qc); | |
2096 | } else { | |
2097 | if (qc->flags & ATA_QCFLAG_SENSE_VALID) { | |
2098 | ata_eh_qc_complete(qc); | |
2099 | } else { | |
2100 | /* feed zero TF to sense generation */ | |
2101 | memset(&qc->result_tf, 0, sizeof(qc->result_tf)); | |
2102 | ata_eh_qc_retry(qc); | |
2103 | } | |
2104 | } | |
2105 | } | |
2106 | } | |
2107 | ||
2108 | /** | |
2109 | * ata_do_eh - do standard error handling | |
2110 | * @ap: host port to handle error for | |
f5914a46 | 2111 | * @prereset: prereset method (can be NULL) |
022bdb07 TH |
2112 | * @softreset: softreset method (can be NULL) |
2113 | * @hardreset: hardreset method (can be NULL) | |
2114 | * @postreset: postreset method (can be NULL) | |
2115 | * | |
2116 | * Perform standard error handling sequence. | |
2117 | * | |
2118 | * LOCKING: | |
2119 | * Kernel thread context (may sleep). | |
2120 | */ | |
f5914a46 TH |
2121 | void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset, |
2122 | ata_reset_fn_t softreset, ata_reset_fn_t hardreset, | |
2123 | ata_postreset_fn_t postreset) | |
022bdb07 | 2124 | { |
1cdaf534 TH |
2125 | ata_eh_autopsy(ap); |
2126 | ata_eh_report(ap); | |
f5914a46 | 2127 | ata_eh_recover(ap, prereset, softreset, hardreset, postreset); |
022bdb07 TH |
2128 | ata_eh_finish(ap); |
2129 | } | |
500530f6 TH |
2130 | |
2131 | /** | |
2132 | * ata_eh_handle_port_suspend - perform port suspend operation | |
2133 | * @ap: port to suspend | |
2134 | * | |
2135 | * Suspend @ap. | |
2136 | * | |
2137 | * LOCKING: | |
2138 | * Kernel thread context (may sleep). | |
2139 | */ | |
2140 | static void ata_eh_handle_port_suspend(struct ata_port *ap) | |
2141 | { | |
2142 | unsigned long flags; | |
2143 | int rc = 0; | |
2144 | ||
2145 | /* are we suspending? */ | |
2146 | spin_lock_irqsave(ap->lock, flags); | |
2147 | if (!(ap->pflags & ATA_PFLAG_PM_PENDING) || | |
2148 | ap->pm_mesg.event == PM_EVENT_ON) { | |
2149 | spin_unlock_irqrestore(ap->lock, flags); | |
2150 | return; | |
2151 | } | |
2152 | spin_unlock_irqrestore(ap->lock, flags); | |
2153 | ||
2154 | WARN_ON(ap->pflags & ATA_PFLAG_SUSPENDED); | |
2155 | ||
2156 | /* suspend */ | |
2157 | ata_eh_freeze_port(ap); | |
2158 | ||
2159 | if (ap->ops->port_suspend) | |
2160 | rc = ap->ops->port_suspend(ap, ap->pm_mesg); | |
2161 | ||
2162 | /* report result */ | |
2163 | spin_lock_irqsave(ap->lock, flags); | |
2164 | ||
2165 | ap->pflags &= ~ATA_PFLAG_PM_PENDING; | |
2166 | if (rc == 0) | |
2167 | ap->pflags |= ATA_PFLAG_SUSPENDED; | |
2168 | else | |
2169 | ata_port_schedule_eh(ap); | |
2170 | ||
2171 | if (ap->pm_result) { | |
2172 | *ap->pm_result = rc; | |
2173 | ap->pm_result = NULL; | |
2174 | } | |
2175 | ||
2176 | spin_unlock_irqrestore(ap->lock, flags); | |
2177 | ||
2178 | return; | |
2179 | } | |
2180 | ||
2181 | /** | |
2182 | * ata_eh_handle_port_resume - perform port resume operation | |
2183 | * @ap: port to resume | |
2184 | * | |
2185 | * Resume @ap. | |
2186 | * | |
2187 | * This function also waits upto one second until all devices | |
2188 | * hanging off this port requests resume EH action. This is to | |
2189 | * prevent invoking EH and thus reset multiple times on resume. | |
2190 | * | |
2191 | * On DPM resume, where some of devices might not be resumed | |
2192 | * together, this may delay port resume upto one second, but such | |
2193 | * DPM resumes are rare and 1 sec delay isn't too bad. | |
2194 | * | |
2195 | * LOCKING: | |
2196 | * Kernel thread context (may sleep). | |
2197 | */ | |
2198 | static void ata_eh_handle_port_resume(struct ata_port *ap) | |
2199 | { | |
2200 | unsigned long timeout; | |
2201 | unsigned long flags; | |
2202 | int i, rc = 0; | |
2203 | ||
2204 | /* are we resuming? */ | |
2205 | spin_lock_irqsave(ap->lock, flags); | |
2206 | if (!(ap->pflags & ATA_PFLAG_PM_PENDING) || | |
2207 | ap->pm_mesg.event != PM_EVENT_ON) { | |
2208 | spin_unlock_irqrestore(ap->lock, flags); | |
2209 | return; | |
2210 | } | |
2211 | spin_unlock_irqrestore(ap->lock, flags); | |
2212 | ||
2213 | /* spurious? */ | |
2214 | if (!(ap->pflags & ATA_PFLAG_SUSPENDED)) | |
2215 | goto done; | |
2216 | ||
2217 | if (ap->ops->port_resume) | |
2218 | rc = ap->ops->port_resume(ap); | |
2219 | ||
2220 | /* give devices time to request EH */ | |
2221 | timeout = jiffies + HZ; /* 1s max */ | |
2222 | while (1) { | |
2223 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
2224 | struct ata_device *dev = &ap->device[i]; | |
2225 | unsigned int action = ata_eh_dev_action(dev); | |
2226 | ||
2227 | if ((dev->flags & ATA_DFLAG_SUSPENDED) && | |
2228 | !(action & ATA_EH_RESUME)) | |
2229 | break; | |
2230 | } | |
2231 | ||
2232 | if (i == ATA_MAX_DEVICES || time_after(jiffies, timeout)) | |
2233 | break; | |
2234 | msleep(10); | |
2235 | } | |
2236 | ||
2237 | done: | |
2238 | spin_lock_irqsave(ap->lock, flags); | |
2239 | ap->pflags &= ~(ATA_PFLAG_PM_PENDING | ATA_PFLAG_SUSPENDED); | |
2240 | if (ap->pm_result) { | |
2241 | *ap->pm_result = rc; | |
2242 | ap->pm_result = NULL; | |
2243 | } | |
2244 | spin_unlock_irqrestore(ap->lock, flags); | |
2245 | } |