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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 | ||
35 | #include <linux/config.h> | |
36 | #include <linux/kernel.h> | |
37 | #include <scsi/scsi.h> | |
38 | #include <scsi/scsi_host.h> | |
39 | #include <scsi/scsi_eh.h> | |
40 | #include <scsi/scsi_device.h> | |
41 | #include <scsi/scsi_cmnd.h> | |
c6fd2807 | 42 | #include "../scsi/scsi_transport_api.h" |
ece1d636 TH |
43 | |
44 | #include <linux/libata.h> | |
45 | ||
46 | #include "libata.h" | |
47 | ||
ad9e2762 | 48 | static void __ata_port_freeze(struct ata_port *ap); |
720ba126 | 49 | static void ata_eh_finish(struct ata_port *ap); |
500530f6 TH |
50 | static void ata_eh_handle_port_suspend(struct ata_port *ap); |
51 | static void ata_eh_handle_port_resume(struct ata_port *ap); | |
ad9e2762 | 52 | |
0c247c55 TH |
53 | static void ata_ering_record(struct ata_ering *ering, int is_io, |
54 | unsigned int err_mask) | |
55 | { | |
56 | struct ata_ering_entry *ent; | |
57 | ||
58 | WARN_ON(!err_mask); | |
59 | ||
60 | ering->cursor++; | |
61 | ering->cursor %= ATA_ERING_SIZE; | |
62 | ||
63 | ent = &ering->ring[ering->cursor]; | |
64 | ent->is_io = is_io; | |
65 | ent->err_mask = err_mask; | |
66 | ent->timestamp = get_jiffies_64(); | |
67 | } | |
68 | ||
69 | static struct ata_ering_entry * ata_ering_top(struct ata_ering *ering) | |
70 | { | |
71 | struct ata_ering_entry *ent = &ering->ring[ering->cursor]; | |
72 | if (!ent->err_mask) | |
73 | return NULL; | |
74 | return ent; | |
75 | } | |
76 | ||
77 | static int ata_ering_map(struct ata_ering *ering, | |
78 | int (*map_fn)(struct ata_ering_entry *, void *), | |
79 | void *arg) | |
80 | { | |
81 | int idx, rc = 0; | |
82 | struct ata_ering_entry *ent; | |
83 | ||
84 | idx = ering->cursor; | |
85 | do { | |
86 | ent = &ering->ring[idx]; | |
87 | if (!ent->err_mask) | |
88 | break; | |
89 | rc = map_fn(ent, arg); | |
90 | if (rc) | |
91 | break; | |
92 | idx = (idx - 1 + ATA_ERING_SIZE) % ATA_ERING_SIZE; | |
93 | } while (idx != ering->cursor); | |
94 | ||
95 | return rc; | |
96 | } | |
97 | ||
64f65ca6 TH |
98 | static unsigned int ata_eh_dev_action(struct ata_device *dev) |
99 | { | |
100 | struct ata_eh_context *ehc = &dev->ap->eh_context; | |
101 | ||
102 | return ehc->i.action | ehc->i.dev_action[dev->devno]; | |
103 | } | |
104 | ||
af181c2d TH |
105 | static void ata_eh_clear_action(struct ata_device *dev, |
106 | struct ata_eh_info *ehi, unsigned int action) | |
107 | { | |
108 | int i; | |
109 | ||
110 | if (!dev) { | |
111 | ehi->action &= ~action; | |
112 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
113 | ehi->dev_action[i] &= ~action; | |
114 | } else { | |
115 | /* doesn't make sense for port-wide EH actions */ | |
116 | WARN_ON(!(action & ATA_EH_PERDEV_MASK)); | |
117 | ||
118 | /* break ehi->action into ehi->dev_action */ | |
119 | if (ehi->action & action) { | |
120 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
121 | ehi->dev_action[i] |= ehi->action & action; | |
122 | ehi->action &= ~action; | |
123 | } | |
124 | ||
125 | /* turn off the specified per-dev action */ | |
126 | ehi->dev_action[dev->devno] &= ~action; | |
127 | } | |
128 | } | |
129 | ||
ece1d636 TH |
130 | /** |
131 | * ata_scsi_timed_out - SCSI layer time out callback | |
132 | * @cmd: timed out SCSI command | |
133 | * | |
134 | * Handles SCSI layer timeout. We race with normal completion of | |
135 | * the qc for @cmd. If the qc is already gone, we lose and let | |
136 | * the scsi command finish (EH_HANDLED). Otherwise, the qc has | |
137 | * timed out and EH should be invoked. Prevent ata_qc_complete() | |
138 | * from finishing it by setting EH_SCHEDULED and return | |
139 | * EH_NOT_HANDLED. | |
140 | * | |
ad9e2762 TH |
141 | * TODO: kill this function once old EH is gone. |
142 | * | |
ece1d636 TH |
143 | * LOCKING: |
144 | * Called from timer context | |
145 | * | |
146 | * RETURNS: | |
147 | * EH_HANDLED or EH_NOT_HANDLED | |
148 | */ | |
149 | enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd) | |
150 | { | |
151 | struct Scsi_Host *host = cmd->device->host; | |
35bb94b1 | 152 | struct ata_port *ap = ata_shost_to_port(host); |
ece1d636 TH |
153 | unsigned long flags; |
154 | struct ata_queued_cmd *qc; | |
ad9e2762 | 155 | enum scsi_eh_timer_return ret; |
ece1d636 TH |
156 | |
157 | DPRINTK("ENTER\n"); | |
158 | ||
ad9e2762 TH |
159 | if (ap->ops->error_handler) { |
160 | ret = EH_NOT_HANDLED; | |
161 | goto out; | |
162 | } | |
163 | ||
164 | ret = EH_HANDLED; | |
ba6a1308 | 165 | spin_lock_irqsave(ap->lock, flags); |
ece1d636 TH |
166 | qc = ata_qc_from_tag(ap, ap->active_tag); |
167 | if (qc) { | |
168 | WARN_ON(qc->scsicmd != cmd); | |
169 | qc->flags |= ATA_QCFLAG_EH_SCHEDULED; | |
170 | qc->err_mask |= AC_ERR_TIMEOUT; | |
171 | ret = EH_NOT_HANDLED; | |
172 | } | |
ba6a1308 | 173 | spin_unlock_irqrestore(ap->lock, flags); |
ece1d636 | 174 | |
ad9e2762 | 175 | out: |
ece1d636 TH |
176 | DPRINTK("EXIT, ret=%d\n", ret); |
177 | return ret; | |
178 | } | |
179 | ||
180 | /** | |
181 | * ata_scsi_error - SCSI layer error handler callback | |
182 | * @host: SCSI host on which error occurred | |
183 | * | |
184 | * Handles SCSI-layer-thrown error events. | |
185 | * | |
186 | * LOCKING: | |
187 | * Inherited from SCSI layer (none, can sleep) | |
188 | * | |
189 | * RETURNS: | |
190 | * Zero. | |
191 | */ | |
381544bb | 192 | void ata_scsi_error(struct Scsi_Host *host) |
ece1d636 | 193 | { |
35bb94b1 | 194 | struct ata_port *ap = ata_shost_to_port(host); |
ad9e2762 TH |
195 | int i, repeat_cnt = ATA_EH_MAX_REPEAT; |
196 | unsigned long flags; | |
ece1d636 TH |
197 | |
198 | DPRINTK("ENTER\n"); | |
199 | ||
ad9e2762 | 200 | /* synchronize with port task */ |
ece1d636 TH |
201 | ata_port_flush_task(ap); |
202 | ||
ad9e2762 TH |
203 | /* synchronize with host_set lock and sort out timeouts */ |
204 | ||
205 | /* For new EH, all qcs are finished in one of three ways - | |
206 | * normal completion, error completion, and SCSI timeout. | |
207 | * Both cmpletions can race against SCSI timeout. When normal | |
208 | * completion wins, the qc never reaches EH. When error | |
209 | * completion wins, the qc has ATA_QCFLAG_FAILED set. | |
210 | * | |
211 | * When SCSI timeout wins, things are a bit more complex. | |
212 | * Normal or error completion can occur after the timeout but | |
213 | * before this point. In such cases, both types of | |
214 | * completions are honored. A scmd is determined to have | |
215 | * timed out iff its associated qc is active and not failed. | |
216 | */ | |
217 | if (ap->ops->error_handler) { | |
218 | struct scsi_cmnd *scmd, *tmp; | |
219 | int nr_timedout = 0; | |
220 | ||
e30349d2 | 221 | spin_lock_irqsave(ap->lock, flags); |
ad9e2762 TH |
222 | |
223 | list_for_each_entry_safe(scmd, tmp, &host->eh_cmd_q, eh_entry) { | |
224 | struct ata_queued_cmd *qc; | |
225 | ||
226 | for (i = 0; i < ATA_MAX_QUEUE; i++) { | |
227 | qc = __ata_qc_from_tag(ap, i); | |
228 | if (qc->flags & ATA_QCFLAG_ACTIVE && | |
229 | qc->scsicmd == scmd) | |
230 | break; | |
231 | } | |
232 | ||
233 | if (i < ATA_MAX_QUEUE) { | |
234 | /* the scmd has an associated qc */ | |
235 | if (!(qc->flags & ATA_QCFLAG_FAILED)) { | |
236 | /* which hasn't failed yet, timeout */ | |
237 | qc->err_mask |= AC_ERR_TIMEOUT; | |
238 | qc->flags |= ATA_QCFLAG_FAILED; | |
239 | nr_timedout++; | |
240 | } | |
241 | } else { | |
242 | /* Normal completion occurred after | |
243 | * SCSI timeout but before this point. | |
244 | * Successfully complete it. | |
245 | */ | |
246 | scmd->retries = scmd->allowed; | |
247 | scsi_eh_finish_cmd(scmd, &ap->eh_done_q); | |
248 | } | |
249 | } | |
250 | ||
251 | /* If we have timed out qcs. They belong to EH from | |
252 | * this point but the state of the controller is | |
253 | * unknown. Freeze the port to make sure the IRQ | |
254 | * handler doesn't diddle with those qcs. This must | |
255 | * be done atomically w.r.t. setting QCFLAG_FAILED. | |
256 | */ | |
257 | if (nr_timedout) | |
258 | __ata_port_freeze(ap); | |
259 | ||
e30349d2 | 260 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 | 261 | } else |
e30349d2 | 262 | spin_unlock_wait(ap->lock); |
ad9e2762 TH |
263 | |
264 | repeat: | |
265 | /* invoke error handler */ | |
266 | if (ap->ops->error_handler) { | |
500530f6 TH |
267 | /* process port resume request */ |
268 | ata_eh_handle_port_resume(ap); | |
269 | ||
f3e81b19 | 270 | /* fetch & clear EH info */ |
e30349d2 | 271 | spin_lock_irqsave(ap->lock, flags); |
f3e81b19 TH |
272 | |
273 | memset(&ap->eh_context, 0, sizeof(ap->eh_context)); | |
274 | ap->eh_context.i = ap->eh_info; | |
275 | memset(&ap->eh_info, 0, sizeof(ap->eh_info)); | |
276 | ||
b51e9e5d TH |
277 | ap->pflags |= ATA_PFLAG_EH_IN_PROGRESS; |
278 | ap->pflags &= ~ATA_PFLAG_EH_PENDING; | |
f3e81b19 | 279 | |
e30349d2 | 280 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 | 281 | |
500530f6 TH |
282 | /* invoke EH, skip if unloading or suspended */ |
283 | if (!(ap->pflags & (ATA_PFLAG_UNLOADING | ATA_PFLAG_SUSPENDED))) | |
720ba126 TH |
284 | ap->ops->error_handler(ap); |
285 | else | |
286 | ata_eh_finish(ap); | |
ad9e2762 | 287 | |
500530f6 TH |
288 | /* process port suspend request */ |
289 | ata_eh_handle_port_suspend(ap); | |
290 | ||
ad9e2762 TH |
291 | /* Exception might have happend after ->error_handler |
292 | * recovered the port but before this point. Repeat | |
293 | * EH in such case. | |
294 | */ | |
e30349d2 | 295 | spin_lock_irqsave(ap->lock, flags); |
ad9e2762 | 296 | |
b51e9e5d | 297 | if (ap->pflags & ATA_PFLAG_EH_PENDING) { |
ad9e2762 TH |
298 | if (--repeat_cnt) { |
299 | ata_port_printk(ap, KERN_INFO, | |
300 | "EH pending after completion, " | |
301 | "repeating EH (cnt=%d)\n", repeat_cnt); | |
e30349d2 | 302 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 TH |
303 | goto repeat; |
304 | } | |
305 | ata_port_printk(ap, KERN_ERR, "EH pending after %d " | |
306 | "tries, giving up\n", ATA_EH_MAX_REPEAT); | |
307 | } | |
308 | ||
f3e81b19 TH |
309 | /* this run is complete, make sure EH info is clear */ |
310 | memset(&ap->eh_info, 0, sizeof(ap->eh_info)); | |
311 | ||
e30349d2 | 312 | /* Clear host_eh_scheduled while holding ap->lock such |
ad9e2762 TH |
313 | * that if exception occurs after this point but |
314 | * before EH completion, SCSI midlayer will | |
315 | * re-initiate EH. | |
316 | */ | |
317 | host->host_eh_scheduled = 0; | |
318 | ||
e30349d2 | 319 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 TH |
320 | } else { |
321 | WARN_ON(ata_qc_from_tag(ap, ap->active_tag) == NULL); | |
322 | ap->ops->eng_timeout(ap); | |
323 | } | |
ece1d636 | 324 | |
ad9e2762 | 325 | /* finish or retry handled scmd's and clean up */ |
ece1d636 TH |
326 | WARN_ON(host->host_failed || !list_empty(&host->eh_cmd_q)); |
327 | ||
328 | scsi_eh_flush_done_q(&ap->eh_done_q); | |
329 | ||
ad9e2762 | 330 | /* clean up */ |
e30349d2 | 331 | spin_lock_irqsave(ap->lock, flags); |
ad9e2762 | 332 | |
1cdaf534 | 333 | if (ap->pflags & ATA_PFLAG_LOADING) |
b51e9e5d | 334 | ap->pflags &= ~ATA_PFLAG_LOADING; |
1cdaf534 TH |
335 | else if (ap->pflags & ATA_PFLAG_SCSI_HOTPLUG) |
336 | queue_work(ata_aux_wq, &ap->hotplug_task); | |
337 | ||
338 | if (ap->pflags & ATA_PFLAG_RECOVERED) | |
339 | ata_port_printk(ap, KERN_INFO, "EH complete\n"); | |
580b2102 | 340 | |
b51e9e5d | 341 | ap->pflags &= ~(ATA_PFLAG_SCSI_HOTPLUG | ATA_PFLAG_RECOVERED); |
ad9e2762 | 342 | |
c6cf9e99 | 343 | /* tell wait_eh that we're done */ |
b51e9e5d | 344 | ap->pflags &= ~ATA_PFLAG_EH_IN_PROGRESS; |
c6cf9e99 TH |
345 | wake_up_all(&ap->eh_wait_q); |
346 | ||
e30349d2 | 347 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 | 348 | |
ece1d636 | 349 | DPRINTK("EXIT\n"); |
ece1d636 TH |
350 | } |
351 | ||
c6cf9e99 TH |
352 | /** |
353 | * ata_port_wait_eh - Wait for the currently pending EH to complete | |
354 | * @ap: Port to wait EH for | |
355 | * | |
356 | * Wait until the currently pending EH is complete. | |
357 | * | |
358 | * LOCKING: | |
359 | * Kernel thread context (may sleep). | |
360 | */ | |
361 | void ata_port_wait_eh(struct ata_port *ap) | |
362 | { | |
363 | unsigned long flags; | |
364 | DEFINE_WAIT(wait); | |
365 | ||
366 | retry: | |
ba6a1308 | 367 | spin_lock_irqsave(ap->lock, flags); |
c6cf9e99 | 368 | |
b51e9e5d | 369 | while (ap->pflags & (ATA_PFLAG_EH_PENDING | ATA_PFLAG_EH_IN_PROGRESS)) { |
c6cf9e99 | 370 | prepare_to_wait(&ap->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE); |
ba6a1308 | 371 | spin_unlock_irqrestore(ap->lock, flags); |
c6cf9e99 | 372 | schedule(); |
ba6a1308 | 373 | spin_lock_irqsave(ap->lock, flags); |
c6cf9e99 | 374 | } |
0a1b622e | 375 | finish_wait(&ap->eh_wait_q, &wait); |
c6cf9e99 | 376 | |
ba6a1308 | 377 | spin_unlock_irqrestore(ap->lock, flags); |
c6cf9e99 TH |
378 | |
379 | /* make sure SCSI EH is complete */ | |
380 | if (scsi_host_in_recovery(ap->host)) { | |
381 | msleep(10); | |
382 | goto retry; | |
383 | } | |
384 | } | |
385 | ||
ece1d636 TH |
386 | /** |
387 | * ata_qc_timeout - Handle timeout of queued command | |
388 | * @qc: Command that timed out | |
389 | * | |
390 | * Some part of the kernel (currently, only the SCSI layer) | |
391 | * has noticed that the active command on port @ap has not | |
392 | * completed after a specified length of time. Handle this | |
393 | * condition by disabling DMA (if necessary) and completing | |
394 | * transactions, with error if necessary. | |
395 | * | |
396 | * This also handles the case of the "lost interrupt", where | |
397 | * for some reason (possibly hardware bug, possibly driver bug) | |
398 | * an interrupt was not delivered to the driver, even though the | |
399 | * transaction completed successfully. | |
400 | * | |
ad9e2762 TH |
401 | * TODO: kill this function once old EH is gone. |
402 | * | |
ece1d636 TH |
403 | * LOCKING: |
404 | * Inherited from SCSI layer (none, can sleep) | |
405 | */ | |
406 | static void ata_qc_timeout(struct ata_queued_cmd *qc) | |
407 | { | |
408 | struct ata_port *ap = qc->ap; | |
ece1d636 TH |
409 | u8 host_stat = 0, drv_stat; |
410 | unsigned long flags; | |
411 | ||
412 | DPRINTK("ENTER\n"); | |
413 | ||
414 | ap->hsm_task_state = HSM_ST_IDLE; | |
415 | ||
ba6a1308 | 416 | spin_lock_irqsave(ap->lock, flags); |
ece1d636 TH |
417 | |
418 | switch (qc->tf.protocol) { | |
419 | ||
420 | case ATA_PROT_DMA: | |
421 | case ATA_PROT_ATAPI_DMA: | |
422 | host_stat = ap->ops->bmdma_status(ap); | |
423 | ||
424 | /* before we do anything else, clear DMA-Start bit */ | |
425 | ap->ops->bmdma_stop(qc); | |
426 | ||
427 | /* fall through */ | |
428 | ||
429 | default: | |
430 | ata_altstatus(ap); | |
431 | drv_stat = ata_chk_status(ap); | |
432 | ||
433 | /* ack bmdma irq events */ | |
434 | ap->ops->irq_clear(ap); | |
435 | ||
f15a1daf TH |
436 | ata_dev_printk(qc->dev, KERN_ERR, "command 0x%x timeout, " |
437 | "stat 0x%x host_stat 0x%x\n", | |
438 | qc->tf.command, drv_stat, host_stat); | |
ece1d636 TH |
439 | |
440 | /* complete taskfile transaction */ | |
c13b56a1 | 441 | qc->err_mask |= AC_ERR_TIMEOUT; |
ece1d636 TH |
442 | break; |
443 | } | |
444 | ||
ba6a1308 | 445 | spin_unlock_irqrestore(ap->lock, flags); |
ece1d636 TH |
446 | |
447 | ata_eh_qc_complete(qc); | |
448 | ||
449 | DPRINTK("EXIT\n"); | |
450 | } | |
451 | ||
452 | /** | |
453 | * ata_eng_timeout - Handle timeout of queued command | |
454 | * @ap: Port on which timed-out command is active | |
455 | * | |
456 | * Some part of the kernel (currently, only the SCSI layer) | |
457 | * has noticed that the active command on port @ap has not | |
458 | * completed after a specified length of time. Handle this | |
459 | * condition by disabling DMA (if necessary) and completing | |
460 | * transactions, with error if necessary. | |
461 | * | |
462 | * This also handles the case of the "lost interrupt", where | |
463 | * for some reason (possibly hardware bug, possibly driver bug) | |
464 | * an interrupt was not delivered to the driver, even though the | |
465 | * transaction completed successfully. | |
466 | * | |
ad9e2762 TH |
467 | * TODO: kill this function once old EH is gone. |
468 | * | |
ece1d636 TH |
469 | * LOCKING: |
470 | * Inherited from SCSI layer (none, can sleep) | |
471 | */ | |
472 | void ata_eng_timeout(struct ata_port *ap) | |
473 | { | |
474 | DPRINTK("ENTER\n"); | |
475 | ||
476 | ata_qc_timeout(ata_qc_from_tag(ap, ap->active_tag)); | |
477 | ||
478 | DPRINTK("EXIT\n"); | |
479 | } | |
480 | ||
f686bcb8 TH |
481 | /** |
482 | * ata_qc_schedule_eh - schedule qc for error handling | |
483 | * @qc: command to schedule error handling for | |
484 | * | |
485 | * Schedule error handling for @qc. EH will kick in as soon as | |
486 | * other commands are drained. | |
487 | * | |
488 | * LOCKING: | |
489 | * spin_lock_irqsave(host_set lock) | |
490 | */ | |
491 | void ata_qc_schedule_eh(struct ata_queued_cmd *qc) | |
492 | { | |
493 | struct ata_port *ap = qc->ap; | |
494 | ||
495 | WARN_ON(!ap->ops->error_handler); | |
496 | ||
497 | qc->flags |= ATA_QCFLAG_FAILED; | |
b51e9e5d | 498 | qc->ap->pflags |= ATA_PFLAG_EH_PENDING; |
f686bcb8 TH |
499 | |
500 | /* The following will fail if timeout has already expired. | |
501 | * ata_scsi_error() takes care of such scmds on EH entry. | |
502 | * Note that ATA_QCFLAG_FAILED is unconditionally set after | |
503 | * this function completes. | |
504 | */ | |
505 | scsi_req_abort_cmd(qc->scsicmd); | |
506 | } | |
507 | ||
7b70fc03 TH |
508 | /** |
509 | * ata_port_schedule_eh - schedule error handling without a qc | |
510 | * @ap: ATA port to schedule EH for | |
511 | * | |
512 | * Schedule error handling for @ap. EH will kick in as soon as | |
513 | * all commands are drained. | |
514 | * | |
515 | * LOCKING: | |
516 | * spin_lock_irqsave(host_set lock) | |
517 | */ | |
518 | void ata_port_schedule_eh(struct ata_port *ap) | |
519 | { | |
520 | WARN_ON(!ap->ops->error_handler); | |
521 | ||
b51e9e5d | 522 | ap->pflags |= ATA_PFLAG_EH_PENDING; |
f8bbfc24 | 523 | scsi_schedule_eh(ap->host); |
7b70fc03 TH |
524 | |
525 | DPRINTK("port EH scheduled\n"); | |
526 | } | |
527 | ||
528 | /** | |
529 | * ata_port_abort - abort all qc's on the port | |
530 | * @ap: ATA port to abort qc's for | |
531 | * | |
532 | * Abort all active qc's of @ap and schedule EH. | |
533 | * | |
534 | * LOCKING: | |
535 | * spin_lock_irqsave(host_set lock) | |
536 | * | |
537 | * RETURNS: | |
538 | * Number of aborted qc's. | |
539 | */ | |
540 | int ata_port_abort(struct ata_port *ap) | |
541 | { | |
542 | int tag, nr_aborted = 0; | |
543 | ||
544 | WARN_ON(!ap->ops->error_handler); | |
545 | ||
546 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
547 | struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag); | |
548 | ||
549 | if (qc) { | |
550 | qc->flags |= ATA_QCFLAG_FAILED; | |
551 | ata_qc_complete(qc); | |
552 | nr_aborted++; | |
553 | } | |
554 | } | |
555 | ||
556 | if (!nr_aborted) | |
557 | ata_port_schedule_eh(ap); | |
558 | ||
559 | return nr_aborted; | |
560 | } | |
561 | ||
e3180499 TH |
562 | /** |
563 | * __ata_port_freeze - freeze port | |
564 | * @ap: ATA port to freeze | |
565 | * | |
566 | * This function is called when HSM violation or some other | |
567 | * condition disrupts normal operation of the port. Frozen port | |
568 | * is not allowed to perform any operation until the port is | |
569 | * thawed, which usually follows a successful reset. | |
570 | * | |
571 | * ap->ops->freeze() callback can be used for freezing the port | |
572 | * hardware-wise (e.g. mask interrupt and stop DMA engine). If a | |
573 | * port cannot be frozen hardware-wise, the interrupt handler | |
574 | * must ack and clear interrupts unconditionally while the port | |
575 | * is frozen. | |
576 | * | |
577 | * LOCKING: | |
578 | * spin_lock_irqsave(host_set lock) | |
579 | */ | |
580 | static void __ata_port_freeze(struct ata_port *ap) | |
581 | { | |
582 | WARN_ON(!ap->ops->error_handler); | |
583 | ||
584 | if (ap->ops->freeze) | |
585 | ap->ops->freeze(ap); | |
586 | ||
b51e9e5d | 587 | ap->pflags |= ATA_PFLAG_FROZEN; |
e3180499 TH |
588 | |
589 | DPRINTK("ata%u port frozen\n", ap->id); | |
590 | } | |
591 | ||
592 | /** | |
593 | * ata_port_freeze - abort & freeze port | |
594 | * @ap: ATA port to freeze | |
595 | * | |
596 | * Abort and freeze @ap. | |
597 | * | |
598 | * LOCKING: | |
599 | * spin_lock_irqsave(host_set lock) | |
600 | * | |
601 | * RETURNS: | |
602 | * Number of aborted commands. | |
603 | */ | |
604 | int ata_port_freeze(struct ata_port *ap) | |
605 | { | |
606 | int nr_aborted; | |
607 | ||
608 | WARN_ON(!ap->ops->error_handler); | |
609 | ||
610 | nr_aborted = ata_port_abort(ap); | |
611 | __ata_port_freeze(ap); | |
612 | ||
613 | return nr_aborted; | |
614 | } | |
615 | ||
616 | /** | |
617 | * ata_eh_freeze_port - EH helper to freeze port | |
618 | * @ap: ATA port to freeze | |
619 | * | |
620 | * Freeze @ap. | |
621 | * | |
622 | * LOCKING: | |
623 | * None. | |
624 | */ | |
625 | void ata_eh_freeze_port(struct ata_port *ap) | |
626 | { | |
627 | unsigned long flags; | |
628 | ||
629 | if (!ap->ops->error_handler) | |
630 | return; | |
631 | ||
ba6a1308 | 632 | spin_lock_irqsave(ap->lock, flags); |
e3180499 | 633 | __ata_port_freeze(ap); |
ba6a1308 | 634 | spin_unlock_irqrestore(ap->lock, flags); |
e3180499 TH |
635 | } |
636 | ||
637 | /** | |
638 | * ata_port_thaw_port - EH helper to thaw port | |
639 | * @ap: ATA port to thaw | |
640 | * | |
641 | * Thaw frozen port @ap. | |
642 | * | |
643 | * LOCKING: | |
644 | * None. | |
645 | */ | |
646 | void ata_eh_thaw_port(struct ata_port *ap) | |
647 | { | |
648 | unsigned long flags; | |
649 | ||
650 | if (!ap->ops->error_handler) | |
651 | return; | |
652 | ||
ba6a1308 | 653 | spin_lock_irqsave(ap->lock, flags); |
e3180499 | 654 | |
b51e9e5d | 655 | ap->pflags &= ~ATA_PFLAG_FROZEN; |
e3180499 TH |
656 | |
657 | if (ap->ops->thaw) | |
658 | ap->ops->thaw(ap); | |
659 | ||
ba6a1308 | 660 | spin_unlock_irqrestore(ap->lock, flags); |
e3180499 TH |
661 | |
662 | DPRINTK("ata%u port thawed\n", ap->id); | |
663 | } | |
664 | ||
ece1d636 TH |
665 | static void ata_eh_scsidone(struct scsi_cmnd *scmd) |
666 | { | |
667 | /* nada */ | |
668 | } | |
669 | ||
670 | static void __ata_eh_qc_complete(struct ata_queued_cmd *qc) | |
671 | { | |
672 | struct ata_port *ap = qc->ap; | |
673 | struct scsi_cmnd *scmd = qc->scsicmd; | |
674 | unsigned long flags; | |
675 | ||
ba6a1308 | 676 | spin_lock_irqsave(ap->lock, flags); |
ece1d636 TH |
677 | qc->scsidone = ata_eh_scsidone; |
678 | __ata_qc_complete(qc); | |
679 | WARN_ON(ata_tag_valid(qc->tag)); | |
ba6a1308 | 680 | spin_unlock_irqrestore(ap->lock, flags); |
ece1d636 TH |
681 | |
682 | scsi_eh_finish_cmd(scmd, &ap->eh_done_q); | |
683 | } | |
684 | ||
685 | /** | |
686 | * ata_eh_qc_complete - Complete an active ATA command from EH | |
687 | * @qc: Command to complete | |
688 | * | |
689 | * Indicate to the mid and upper layers that an ATA command has | |
690 | * completed. To be used from EH. | |
691 | */ | |
692 | void ata_eh_qc_complete(struct ata_queued_cmd *qc) | |
693 | { | |
694 | struct scsi_cmnd *scmd = qc->scsicmd; | |
695 | scmd->retries = scmd->allowed; | |
696 | __ata_eh_qc_complete(qc); | |
697 | } | |
698 | ||
699 | /** | |
700 | * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH | |
701 | * @qc: Command to retry | |
702 | * | |
703 | * Indicate to the mid and upper layers that an ATA command | |
704 | * should be retried. To be used from EH. | |
705 | * | |
706 | * SCSI midlayer limits the number of retries to scmd->allowed. | |
707 | * scmd->retries is decremented for commands which get retried | |
708 | * due to unrelated failures (qc->err_mask is zero). | |
709 | */ | |
710 | void ata_eh_qc_retry(struct ata_queued_cmd *qc) | |
711 | { | |
712 | struct scsi_cmnd *scmd = qc->scsicmd; | |
713 | if (!qc->err_mask && scmd->retries) | |
714 | scmd->retries--; | |
715 | __ata_eh_qc_complete(qc); | |
716 | } | |
022bdb07 | 717 | |
0ea035a3 TH |
718 | /** |
719 | * ata_eh_detach_dev - detach ATA device | |
720 | * @dev: ATA device to detach | |
721 | * | |
722 | * Detach @dev. | |
723 | * | |
724 | * LOCKING: | |
725 | * None. | |
726 | */ | |
727 | static void ata_eh_detach_dev(struct ata_device *dev) | |
728 | { | |
729 | struct ata_port *ap = dev->ap; | |
730 | unsigned long flags; | |
731 | ||
732 | ata_dev_disable(dev); | |
733 | ||
ba6a1308 | 734 | spin_lock_irqsave(ap->lock, flags); |
0ea035a3 TH |
735 | |
736 | dev->flags &= ~ATA_DFLAG_DETACH; | |
737 | ||
738 | if (ata_scsi_offline_dev(dev)) { | |
739 | dev->flags |= ATA_DFLAG_DETACHED; | |
b51e9e5d | 740 | ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG; |
0ea035a3 TH |
741 | } |
742 | ||
beb07c1a TH |
743 | /* clear per-dev EH actions */ |
744 | ata_eh_clear_action(dev, &ap->eh_info, ATA_EH_PERDEV_MASK); | |
745 | ata_eh_clear_action(dev, &ap->eh_context.i, ATA_EH_PERDEV_MASK); | |
746 | ||
ba6a1308 | 747 | spin_unlock_irqrestore(ap->lock, flags); |
0ea035a3 TH |
748 | } |
749 | ||
022bdb07 TH |
750 | /** |
751 | * ata_eh_about_to_do - about to perform eh_action | |
752 | * @ap: target ATA port | |
47005f25 | 753 | * @dev: target ATA dev for per-dev action (can be NULL) |
022bdb07 TH |
754 | * @action: action about to be performed |
755 | * | |
756 | * Called just before performing EH actions to clear related bits | |
757 | * in @ap->eh_info such that eh actions are not unnecessarily | |
758 | * repeated. | |
759 | * | |
760 | * LOCKING: | |
761 | * None. | |
762 | */ | |
47005f25 TH |
763 | static void ata_eh_about_to_do(struct ata_port *ap, struct ata_device *dev, |
764 | unsigned int action) | |
022bdb07 TH |
765 | { |
766 | unsigned long flags; | |
13abf50d TH |
767 | struct ata_eh_info *ehi = &ap->eh_info; |
768 | struct ata_eh_context *ehc = &ap->eh_context; | |
022bdb07 | 769 | |
ba6a1308 | 770 | spin_lock_irqsave(ap->lock, flags); |
1cdaf534 | 771 | |
13abf50d TH |
772 | /* Reset is represented by combination of actions and EHI |
773 | * flags. Suck in all related bits before clearing eh_info to | |
774 | * avoid losing requested action. | |
775 | */ | |
776 | if (action & ATA_EH_RESET_MASK) { | |
777 | ehc->i.action |= ehi->action & ATA_EH_RESET_MASK; | |
778 | ehc->i.flags |= ehi->flags & ATA_EHI_RESET_MODIFIER_MASK; | |
779 | ||
780 | /* make sure all reset actions are cleared & clear EHI flags */ | |
781 | action |= ATA_EH_RESET_MASK; | |
782 | ehi->flags &= ~ATA_EHI_RESET_MODIFIER_MASK; | |
783 | } | |
784 | ||
785 | ata_eh_clear_action(dev, ehi, action); | |
1cdaf534 | 786 | |
13abf50d | 787 | if (!(ehc->i.flags & ATA_EHI_QUIET)) |
1cdaf534 TH |
788 | ap->pflags |= ATA_PFLAG_RECOVERED; |
789 | ||
ba6a1308 | 790 | spin_unlock_irqrestore(ap->lock, flags); |
022bdb07 TH |
791 | } |
792 | ||
47005f25 TH |
793 | /** |
794 | * ata_eh_done - EH action complete | |
795 | * @ap: target ATA port | |
796 | * @dev: target ATA dev for per-dev action (can be NULL) | |
797 | * @action: action just completed | |
798 | * | |
799 | * Called right after performing EH actions to clear related bits | |
800 | * in @ap->eh_context. | |
801 | * | |
802 | * LOCKING: | |
803 | * None. | |
804 | */ | |
805 | static void ata_eh_done(struct ata_port *ap, struct ata_device *dev, | |
806 | unsigned int action) | |
807 | { | |
13abf50d TH |
808 | /* if reset is complete, clear all reset actions & reset modifier */ |
809 | if (action & ATA_EH_RESET_MASK) { | |
810 | action |= ATA_EH_RESET_MASK; | |
811 | ap->eh_context.i.flags &= ~ATA_EHI_RESET_MODIFIER_MASK; | |
812 | } | |
813 | ||
47005f25 TH |
814 | ata_eh_clear_action(dev, &ap->eh_context.i, action); |
815 | } | |
816 | ||
022bdb07 TH |
817 | /** |
818 | * ata_err_string - convert err_mask to descriptive string | |
819 | * @err_mask: error mask to convert to string | |
820 | * | |
821 | * Convert @err_mask to descriptive string. Errors are | |
822 | * prioritized according to severity and only the most severe | |
823 | * error is reported. | |
824 | * | |
825 | * LOCKING: | |
826 | * None. | |
827 | * | |
828 | * RETURNS: | |
829 | * Descriptive string for @err_mask | |
830 | */ | |
831 | static const char * ata_err_string(unsigned int err_mask) | |
832 | { | |
833 | if (err_mask & AC_ERR_HOST_BUS) | |
834 | return "host bus error"; | |
835 | if (err_mask & AC_ERR_ATA_BUS) | |
836 | return "ATA bus error"; | |
837 | if (err_mask & AC_ERR_TIMEOUT) | |
838 | return "timeout"; | |
839 | if (err_mask & AC_ERR_HSM) | |
840 | return "HSM violation"; | |
841 | if (err_mask & AC_ERR_SYSTEM) | |
842 | return "internal error"; | |
843 | if (err_mask & AC_ERR_MEDIA) | |
844 | return "media error"; | |
845 | if (err_mask & AC_ERR_INVALID) | |
846 | return "invalid argument"; | |
847 | if (err_mask & AC_ERR_DEV) | |
848 | return "device error"; | |
849 | return "unknown error"; | |
850 | } | |
851 | ||
e8ee8451 TH |
852 | /** |
853 | * ata_read_log_page - read a specific log page | |
854 | * @dev: target device | |
855 | * @page: page to read | |
856 | * @buf: buffer to store read page | |
857 | * @sectors: number of sectors to read | |
858 | * | |
859 | * Read log page using READ_LOG_EXT command. | |
860 | * | |
861 | * LOCKING: | |
862 | * Kernel thread context (may sleep). | |
863 | * | |
864 | * RETURNS: | |
865 | * 0 on success, AC_ERR_* mask otherwise. | |
866 | */ | |
867 | static unsigned int ata_read_log_page(struct ata_device *dev, | |
868 | u8 page, void *buf, unsigned int sectors) | |
869 | { | |
870 | struct ata_taskfile tf; | |
871 | unsigned int err_mask; | |
872 | ||
873 | DPRINTK("read log page - page %d\n", page); | |
874 | ||
875 | ata_tf_init(dev, &tf); | |
876 | tf.command = ATA_CMD_READ_LOG_EXT; | |
877 | tf.lbal = page; | |
878 | tf.nsect = sectors; | |
879 | tf.hob_nsect = sectors >> 8; | |
880 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_LBA48 | ATA_TFLAG_DEVICE; | |
881 | tf.protocol = ATA_PROT_PIO; | |
882 | ||
883 | err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE, | |
884 | buf, sectors * ATA_SECT_SIZE); | |
885 | ||
886 | DPRINTK("EXIT, err_mask=%x\n", err_mask); | |
887 | return err_mask; | |
888 | } | |
889 | ||
890 | /** | |
891 | * ata_eh_read_log_10h - Read log page 10h for NCQ error details | |
892 | * @dev: Device to read log page 10h from | |
893 | * @tag: Resulting tag of the failed command | |
894 | * @tf: Resulting taskfile registers of the failed command | |
895 | * | |
896 | * Read log page 10h to obtain NCQ error details and clear error | |
897 | * condition. | |
898 | * | |
899 | * LOCKING: | |
900 | * Kernel thread context (may sleep). | |
901 | * | |
902 | * RETURNS: | |
903 | * 0 on success, -errno otherwise. | |
904 | */ | |
905 | static int ata_eh_read_log_10h(struct ata_device *dev, | |
906 | int *tag, struct ata_taskfile *tf) | |
907 | { | |
908 | u8 *buf = dev->ap->sector_buf; | |
909 | unsigned int err_mask; | |
910 | u8 csum; | |
911 | int i; | |
912 | ||
913 | err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, buf, 1); | |
914 | if (err_mask) | |
915 | return -EIO; | |
916 | ||
917 | csum = 0; | |
918 | for (i = 0; i < ATA_SECT_SIZE; i++) | |
919 | csum += buf[i]; | |
920 | if (csum) | |
921 | ata_dev_printk(dev, KERN_WARNING, | |
922 | "invalid checksum 0x%x on log page 10h\n", csum); | |
923 | ||
924 | if (buf[0] & 0x80) | |
925 | return -ENOENT; | |
926 | ||
927 | *tag = buf[0] & 0x1f; | |
928 | ||
929 | tf->command = buf[2]; | |
930 | tf->feature = buf[3]; | |
931 | tf->lbal = buf[4]; | |
932 | tf->lbam = buf[5]; | |
933 | tf->lbah = buf[6]; | |
934 | tf->device = buf[7]; | |
935 | tf->hob_lbal = buf[8]; | |
936 | tf->hob_lbam = buf[9]; | |
937 | tf->hob_lbah = buf[10]; | |
938 | tf->nsect = buf[12]; | |
939 | tf->hob_nsect = buf[13]; | |
940 | ||
941 | return 0; | |
942 | } | |
943 | ||
022bdb07 TH |
944 | /** |
945 | * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE | |
946 | * @dev: device to perform REQUEST_SENSE to | |
947 | * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long) | |
948 | * | |
949 | * Perform ATAPI REQUEST_SENSE after the device reported CHECK | |
950 | * SENSE. This function is EH helper. | |
951 | * | |
952 | * LOCKING: | |
953 | * Kernel thread context (may sleep). | |
954 | * | |
955 | * RETURNS: | |
956 | * 0 on success, AC_ERR_* mask on failure | |
957 | */ | |
958 | static unsigned int atapi_eh_request_sense(struct ata_device *dev, | |
959 | unsigned char *sense_buf) | |
960 | { | |
961 | struct ata_port *ap = dev->ap; | |
962 | struct ata_taskfile tf; | |
963 | u8 cdb[ATAPI_CDB_LEN]; | |
964 | ||
965 | DPRINTK("ATAPI request sense\n"); | |
966 | ||
967 | ata_tf_init(dev, &tf); | |
968 | ||
969 | /* FIXME: is this needed? */ | |
970 | memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE); | |
971 | ||
972 | /* XXX: why tf_read here? */ | |
973 | ap->ops->tf_read(ap, &tf); | |
974 | ||
975 | /* fill these in, for the case where they are -not- overwritten */ | |
976 | sense_buf[0] = 0x70; | |
977 | sense_buf[2] = tf.feature >> 4; | |
978 | ||
979 | memset(cdb, 0, ATAPI_CDB_LEN); | |
980 | cdb[0] = REQUEST_SENSE; | |
981 | cdb[4] = SCSI_SENSE_BUFFERSIZE; | |
982 | ||
983 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; | |
984 | tf.command = ATA_CMD_PACKET; | |
985 | ||
986 | /* is it pointless to prefer PIO for "safety reasons"? */ | |
987 | if (ap->flags & ATA_FLAG_PIO_DMA) { | |
988 | tf.protocol = ATA_PROT_ATAPI_DMA; | |
989 | tf.feature |= ATAPI_PKT_DMA; | |
990 | } else { | |
991 | tf.protocol = ATA_PROT_ATAPI; | |
992 | tf.lbam = (8 * 1024) & 0xff; | |
993 | tf.lbah = (8 * 1024) >> 8; | |
994 | } | |
995 | ||
996 | return ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE, | |
997 | sense_buf, SCSI_SENSE_BUFFERSIZE); | |
998 | } | |
999 | ||
1000 | /** | |
1001 | * ata_eh_analyze_serror - analyze SError for a failed port | |
1002 | * @ap: ATA port to analyze SError for | |
1003 | * | |
1004 | * Analyze SError if available and further determine cause of | |
1005 | * failure. | |
1006 | * | |
1007 | * LOCKING: | |
1008 | * None. | |
1009 | */ | |
1010 | static void ata_eh_analyze_serror(struct ata_port *ap) | |
1011 | { | |
1012 | struct ata_eh_context *ehc = &ap->eh_context; | |
1013 | u32 serror = ehc->i.serror; | |
1014 | unsigned int err_mask = 0, action = 0; | |
1015 | ||
1016 | if (serror & SERR_PERSISTENT) { | |
1017 | err_mask |= AC_ERR_ATA_BUS; | |
1018 | action |= ATA_EH_HARDRESET; | |
1019 | } | |
1020 | if (serror & | |
1021 | (SERR_DATA_RECOVERED | SERR_COMM_RECOVERED | SERR_DATA)) { | |
1022 | err_mask |= AC_ERR_ATA_BUS; | |
1023 | action |= ATA_EH_SOFTRESET; | |
1024 | } | |
1025 | if (serror & SERR_PROTOCOL) { | |
1026 | err_mask |= AC_ERR_HSM; | |
1027 | action |= ATA_EH_SOFTRESET; | |
1028 | } | |
1029 | if (serror & SERR_INTERNAL) { | |
1030 | err_mask |= AC_ERR_SYSTEM; | |
1031 | action |= ATA_EH_SOFTRESET; | |
1032 | } | |
084fe639 TH |
1033 | if (serror & (SERR_PHYRDY_CHG | SERR_DEV_XCHG)) |
1034 | ata_ehi_hotplugged(&ehc->i); | |
022bdb07 TH |
1035 | |
1036 | ehc->i.err_mask |= err_mask; | |
1037 | ehc->i.action |= action; | |
1038 | } | |
1039 | ||
e8ee8451 TH |
1040 | /** |
1041 | * ata_eh_analyze_ncq_error - analyze NCQ error | |
1042 | * @ap: ATA port to analyze NCQ error for | |
1043 | * | |
1044 | * Read log page 10h, determine the offending qc and acquire | |
1045 | * error status TF. For NCQ device errors, all LLDDs have to do | |
1046 | * is setting AC_ERR_DEV in ehi->err_mask. This function takes | |
1047 | * care of the rest. | |
1048 | * | |
1049 | * LOCKING: | |
1050 | * Kernel thread context (may sleep). | |
1051 | */ | |
1052 | static void ata_eh_analyze_ncq_error(struct ata_port *ap) | |
1053 | { | |
1054 | struct ata_eh_context *ehc = &ap->eh_context; | |
1055 | struct ata_device *dev = ap->device; | |
1056 | struct ata_queued_cmd *qc; | |
1057 | struct ata_taskfile tf; | |
1058 | int tag, rc; | |
1059 | ||
1060 | /* if frozen, we can't do much */ | |
b51e9e5d | 1061 | if (ap->pflags & ATA_PFLAG_FROZEN) |
e8ee8451 TH |
1062 | return; |
1063 | ||
1064 | /* is it NCQ device error? */ | |
1065 | if (!ap->sactive || !(ehc->i.err_mask & AC_ERR_DEV)) | |
1066 | return; | |
1067 | ||
1068 | /* has LLDD analyzed already? */ | |
1069 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1070 | qc = __ata_qc_from_tag(ap, tag); | |
1071 | ||
1072 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
1073 | continue; | |
1074 | ||
1075 | if (qc->err_mask) | |
1076 | return; | |
1077 | } | |
1078 | ||
1079 | /* okay, this error is ours */ | |
1080 | rc = ata_eh_read_log_10h(dev, &tag, &tf); | |
1081 | if (rc) { | |
1082 | ata_port_printk(ap, KERN_ERR, "failed to read log page 10h " | |
1083 | "(errno=%d)\n", rc); | |
1084 | return; | |
1085 | } | |
1086 | ||
1087 | if (!(ap->sactive & (1 << tag))) { | |
1088 | ata_port_printk(ap, KERN_ERR, "log page 10h reported " | |
1089 | "inactive tag %d\n", tag); | |
1090 | return; | |
1091 | } | |
1092 | ||
1093 | /* we've got the perpetrator, condemn it */ | |
1094 | qc = __ata_qc_from_tag(ap, tag); | |
1095 | memcpy(&qc->result_tf, &tf, sizeof(tf)); | |
1096 | qc->err_mask |= AC_ERR_DEV; | |
1097 | ehc->i.err_mask &= ~AC_ERR_DEV; | |
1098 | } | |
1099 | ||
022bdb07 TH |
1100 | /** |
1101 | * ata_eh_analyze_tf - analyze taskfile of a failed qc | |
1102 | * @qc: qc to analyze | |
1103 | * @tf: Taskfile registers to analyze | |
1104 | * | |
1105 | * Analyze taskfile of @qc and further determine cause of | |
1106 | * failure. This function also requests ATAPI sense data if | |
1107 | * avaliable. | |
1108 | * | |
1109 | * LOCKING: | |
1110 | * Kernel thread context (may sleep). | |
1111 | * | |
1112 | * RETURNS: | |
1113 | * Determined recovery action | |
1114 | */ | |
1115 | static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd *qc, | |
1116 | const struct ata_taskfile *tf) | |
1117 | { | |
1118 | unsigned int tmp, action = 0; | |
1119 | u8 stat = tf->command, err = tf->feature; | |
1120 | ||
1121 | if ((stat & (ATA_BUSY | ATA_DRQ | ATA_DRDY)) != ATA_DRDY) { | |
1122 | qc->err_mask |= AC_ERR_HSM; | |
1123 | return ATA_EH_SOFTRESET; | |
1124 | } | |
1125 | ||
1126 | if (!(qc->err_mask & AC_ERR_DEV)) | |
1127 | return 0; | |
1128 | ||
1129 | switch (qc->dev->class) { | |
1130 | case ATA_DEV_ATA: | |
1131 | if (err & ATA_ICRC) | |
1132 | qc->err_mask |= AC_ERR_ATA_BUS; | |
1133 | if (err & ATA_UNC) | |
1134 | qc->err_mask |= AC_ERR_MEDIA; | |
1135 | if (err & ATA_IDNF) | |
1136 | qc->err_mask |= AC_ERR_INVALID; | |
1137 | break; | |
1138 | ||
1139 | case ATA_DEV_ATAPI: | |
1140 | tmp = atapi_eh_request_sense(qc->dev, | |
1141 | qc->scsicmd->sense_buffer); | |
1142 | if (!tmp) { | |
1143 | /* ATA_QCFLAG_SENSE_VALID is used to tell | |
1144 | * atapi_qc_complete() that sense data is | |
1145 | * already valid. | |
1146 | * | |
1147 | * TODO: interpret sense data and set | |
1148 | * appropriate err_mask. | |
1149 | */ | |
1150 | qc->flags |= ATA_QCFLAG_SENSE_VALID; | |
1151 | } else | |
1152 | qc->err_mask |= tmp; | |
1153 | } | |
1154 | ||
1155 | if (qc->err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT | AC_ERR_ATA_BUS)) | |
1156 | action |= ATA_EH_SOFTRESET; | |
1157 | ||
1158 | return action; | |
1159 | } | |
1160 | ||
1161 | static int ata_eh_categorize_ering_entry(struct ata_ering_entry *ent) | |
1162 | { | |
1163 | if (ent->err_mask & (AC_ERR_ATA_BUS | AC_ERR_TIMEOUT)) | |
1164 | return 1; | |
1165 | ||
1166 | if (ent->is_io) { | |
1167 | if (ent->err_mask & AC_ERR_HSM) | |
1168 | return 1; | |
1169 | if ((ent->err_mask & | |
1170 | (AC_ERR_DEV|AC_ERR_MEDIA|AC_ERR_INVALID)) == AC_ERR_DEV) | |
1171 | return 2; | |
1172 | } | |
1173 | ||
1174 | return 0; | |
1175 | } | |
1176 | ||
1177 | struct speed_down_needed_arg { | |
1178 | u64 since; | |
1179 | int nr_errors[3]; | |
1180 | }; | |
1181 | ||
1182 | static int speed_down_needed_cb(struct ata_ering_entry *ent, void *void_arg) | |
1183 | { | |
1184 | struct speed_down_needed_arg *arg = void_arg; | |
1185 | ||
1186 | if (ent->timestamp < arg->since) | |
1187 | return -1; | |
1188 | ||
1189 | arg->nr_errors[ata_eh_categorize_ering_entry(ent)]++; | |
1190 | return 0; | |
1191 | } | |
1192 | ||
1193 | /** | |
1194 | * ata_eh_speed_down_needed - Determine wheter speed down is necessary | |
1195 | * @dev: Device of interest | |
1196 | * | |
1197 | * This function examines error ring of @dev and determines | |
1198 | * whether speed down is necessary. Speed down is necessary if | |
1199 | * there have been more than 3 of Cat-1 errors or 10 of Cat-2 | |
1200 | * errors during last 15 minutes. | |
1201 | * | |
1202 | * Cat-1 errors are ATA_BUS, TIMEOUT for any command and HSM | |
1203 | * violation for known supported commands. | |
1204 | * | |
1205 | * Cat-2 errors are unclassified DEV error for known supported | |
1206 | * command. | |
1207 | * | |
1208 | * LOCKING: | |
1209 | * Inherited from caller. | |
1210 | * | |
1211 | * RETURNS: | |
1212 | * 1 if speed down is necessary, 0 otherwise | |
1213 | */ | |
1214 | static int ata_eh_speed_down_needed(struct ata_device *dev) | |
1215 | { | |
1216 | const u64 interval = 15LLU * 60 * HZ; | |
1217 | static const int err_limits[3] = { -1, 3, 10 }; | |
1218 | struct speed_down_needed_arg arg; | |
1219 | struct ata_ering_entry *ent; | |
1220 | int err_cat; | |
1221 | u64 j64; | |
1222 | ||
1223 | ent = ata_ering_top(&dev->ering); | |
1224 | if (!ent) | |
1225 | return 0; | |
1226 | ||
1227 | err_cat = ata_eh_categorize_ering_entry(ent); | |
1228 | if (err_cat == 0) | |
1229 | return 0; | |
1230 | ||
1231 | memset(&arg, 0, sizeof(arg)); | |
1232 | ||
1233 | j64 = get_jiffies_64(); | |
1234 | if (j64 >= interval) | |
1235 | arg.since = j64 - interval; | |
1236 | else | |
1237 | arg.since = 0; | |
1238 | ||
1239 | ata_ering_map(&dev->ering, speed_down_needed_cb, &arg); | |
1240 | ||
1241 | return arg.nr_errors[err_cat] > err_limits[err_cat]; | |
1242 | } | |
1243 | ||
1244 | /** | |
1245 | * ata_eh_speed_down - record error and speed down if necessary | |
1246 | * @dev: Failed device | |
1247 | * @is_io: Did the device fail during normal IO? | |
1248 | * @err_mask: err_mask of the error | |
1249 | * | |
1250 | * Record error and examine error history to determine whether | |
1251 | * adjusting transmission speed is necessary. It also sets | |
1252 | * transmission limits appropriately if such adjustment is | |
1253 | * necessary. | |
1254 | * | |
1255 | * LOCKING: | |
1256 | * Kernel thread context (may sleep). | |
1257 | * | |
1258 | * RETURNS: | |
1259 | * 0 on success, -errno otherwise | |
1260 | */ | |
1261 | static int ata_eh_speed_down(struct ata_device *dev, int is_io, | |
1262 | unsigned int err_mask) | |
1263 | { | |
1264 | if (!err_mask) | |
1265 | return 0; | |
1266 | ||
1267 | /* record error and determine whether speed down is necessary */ | |
1268 | ata_ering_record(&dev->ering, is_io, err_mask); | |
1269 | ||
1270 | if (!ata_eh_speed_down_needed(dev)) | |
1271 | return 0; | |
1272 | ||
1273 | /* speed down SATA link speed if possible */ | |
1274 | if (sata_down_spd_limit(dev->ap) == 0) | |
1275 | return ATA_EH_HARDRESET; | |
1276 | ||
1277 | /* lower transfer mode */ | |
1278 | if (ata_down_xfermask_limit(dev, 0) == 0) | |
1279 | return ATA_EH_SOFTRESET; | |
1280 | ||
1281 | ata_dev_printk(dev, KERN_ERR, | |
1282 | "speed down requested but no transfer mode left\n"); | |
1283 | return 0; | |
1284 | } | |
1285 | ||
1286 | /** | |
1287 | * ata_eh_autopsy - analyze error and determine recovery action | |
1288 | * @ap: ATA port to perform autopsy on | |
1289 | * | |
1290 | * Analyze why @ap failed and determine which recovery action is | |
1291 | * needed. This function also sets more detailed AC_ERR_* values | |
1292 | * and fills sense data for ATAPI CHECK SENSE. | |
1293 | * | |
1294 | * LOCKING: | |
1295 | * Kernel thread context (may sleep). | |
1296 | */ | |
1297 | static void ata_eh_autopsy(struct ata_port *ap) | |
1298 | { | |
1299 | struct ata_eh_context *ehc = &ap->eh_context; | |
022bdb07 TH |
1300 | unsigned int all_err_mask = 0; |
1301 | int tag, is_io = 0; | |
1302 | u32 serror; | |
1303 | int rc; | |
1304 | ||
1305 | DPRINTK("ENTER\n"); | |
1306 | ||
1cdaf534 TH |
1307 | if (ehc->i.flags & ATA_EHI_NO_AUTOPSY) |
1308 | return; | |
1309 | ||
022bdb07 TH |
1310 | /* obtain and analyze SError */ |
1311 | rc = sata_scr_read(ap, SCR_ERROR, &serror); | |
1312 | if (rc == 0) { | |
1313 | ehc->i.serror |= serror; | |
1314 | ata_eh_analyze_serror(ap); | |
1315 | } else if (rc != -EOPNOTSUPP) | |
4528e4da | 1316 | ehc->i.action |= ATA_EH_HARDRESET; |
022bdb07 | 1317 | |
e8ee8451 TH |
1318 | /* analyze NCQ failure */ |
1319 | ata_eh_analyze_ncq_error(ap); | |
1320 | ||
022bdb07 TH |
1321 | /* any real error trumps AC_ERR_OTHER */ |
1322 | if (ehc->i.err_mask & ~AC_ERR_OTHER) | |
1323 | ehc->i.err_mask &= ~AC_ERR_OTHER; | |
1324 | ||
1325 | all_err_mask |= ehc->i.err_mask; | |
1326 | ||
1327 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1328 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
1329 | ||
1330 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
1331 | continue; | |
1332 | ||
1333 | /* inherit upper level err_mask */ | |
1334 | qc->err_mask |= ehc->i.err_mask; | |
1335 | ||
022bdb07 | 1336 | /* analyze TF */ |
4528e4da | 1337 | ehc->i.action |= ata_eh_analyze_tf(qc, &qc->result_tf); |
022bdb07 TH |
1338 | |
1339 | /* DEV errors are probably spurious in case of ATA_BUS error */ | |
1340 | if (qc->err_mask & AC_ERR_ATA_BUS) | |
1341 | qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_MEDIA | | |
1342 | AC_ERR_INVALID); | |
1343 | ||
1344 | /* any real error trumps unknown error */ | |
1345 | if (qc->err_mask & ~AC_ERR_OTHER) | |
1346 | qc->err_mask &= ~AC_ERR_OTHER; | |
1347 | ||
1348 | /* SENSE_VALID trumps dev/unknown error and revalidation */ | |
1349 | if (qc->flags & ATA_QCFLAG_SENSE_VALID) { | |
1350 | qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_OTHER); | |
4528e4da | 1351 | ehc->i.action &= ~ATA_EH_REVALIDATE; |
022bdb07 TH |
1352 | } |
1353 | ||
1354 | /* accumulate error info */ | |
4528e4da | 1355 | ehc->i.dev = qc->dev; |
022bdb07 TH |
1356 | all_err_mask |= qc->err_mask; |
1357 | if (qc->flags & ATA_QCFLAG_IO) | |
1358 | is_io = 1; | |
1359 | } | |
1360 | ||
a20f33ff | 1361 | /* enforce default EH actions */ |
b51e9e5d | 1362 | if (ap->pflags & ATA_PFLAG_FROZEN || |
a20f33ff | 1363 | all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT)) |
4528e4da | 1364 | ehc->i.action |= ATA_EH_SOFTRESET; |
a20f33ff | 1365 | else if (all_err_mask) |
4528e4da | 1366 | ehc->i.action |= ATA_EH_REVALIDATE; |
022bdb07 | 1367 | |
47005f25 | 1368 | /* if we have offending qcs and the associated failed device */ |
4528e4da | 1369 | if (ehc->i.dev) { |
47005f25 | 1370 | /* speed down */ |
4528e4da TH |
1371 | ehc->i.action |= ata_eh_speed_down(ehc->i.dev, is_io, |
1372 | all_err_mask); | |
47005f25 TH |
1373 | |
1374 | /* perform per-dev EH action only on the offending device */ | |
4528e4da TH |
1375 | ehc->i.dev_action[ehc->i.dev->devno] |= |
1376 | ehc->i.action & ATA_EH_PERDEV_MASK; | |
1377 | ehc->i.action &= ~ATA_EH_PERDEV_MASK; | |
47005f25 TH |
1378 | } |
1379 | ||
022bdb07 TH |
1380 | DPRINTK("EXIT\n"); |
1381 | } | |
1382 | ||
1383 | /** | |
1384 | * ata_eh_report - report error handling to user | |
1385 | * @ap: ATA port EH is going on | |
1386 | * | |
1387 | * Report EH to user. | |
1388 | * | |
1389 | * LOCKING: | |
1390 | * None. | |
1391 | */ | |
1392 | static void ata_eh_report(struct ata_port *ap) | |
1393 | { | |
1394 | struct ata_eh_context *ehc = &ap->eh_context; | |
1395 | const char *frozen, *desc; | |
1396 | int tag, nr_failed = 0; | |
1397 | ||
1398 | desc = NULL; | |
1399 | if (ehc->i.desc[0] != '\0') | |
1400 | desc = ehc->i.desc; | |
1401 | ||
1402 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1403 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
1404 | ||
1405 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
1406 | continue; | |
1407 | if (qc->flags & ATA_QCFLAG_SENSE_VALID && !qc->err_mask) | |
1408 | continue; | |
1409 | ||
1410 | nr_failed++; | |
1411 | } | |
1412 | ||
1413 | if (!nr_failed && !ehc->i.err_mask) | |
1414 | return; | |
1415 | ||
1416 | frozen = ""; | |
b51e9e5d | 1417 | if (ap->pflags & ATA_PFLAG_FROZEN) |
022bdb07 TH |
1418 | frozen = " frozen"; |
1419 | ||
1420 | if (ehc->i.dev) { | |
e8ee8451 TH |
1421 | ata_dev_printk(ehc->i.dev, KERN_ERR, "exception Emask 0x%x " |
1422 | "SAct 0x%x SErr 0x%x action 0x%x%s\n", | |
1423 | ehc->i.err_mask, ap->sactive, ehc->i.serror, | |
1424 | ehc->i.action, frozen); | |
022bdb07 TH |
1425 | if (desc) |
1426 | ata_dev_printk(ehc->i.dev, KERN_ERR, "(%s)\n", desc); | |
1427 | } else { | |
e8ee8451 TH |
1428 | ata_port_printk(ap, KERN_ERR, "exception Emask 0x%x " |
1429 | "SAct 0x%x SErr 0x%x action 0x%x%s\n", | |
1430 | ehc->i.err_mask, ap->sactive, ehc->i.serror, | |
1431 | ehc->i.action, frozen); | |
022bdb07 TH |
1432 | if (desc) |
1433 | ata_port_printk(ap, KERN_ERR, "(%s)\n", desc); | |
1434 | } | |
1435 | ||
1436 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1437 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
1438 | ||
1439 | if (!(qc->flags & ATA_QCFLAG_FAILED) || !qc->err_mask) | |
1440 | continue; | |
1441 | ||
1442 | ata_dev_printk(qc->dev, KERN_ERR, "tag %d cmd 0x%x " | |
1443 | "Emask 0x%x stat 0x%x err 0x%x (%s)\n", | |
1444 | qc->tag, qc->tf.command, qc->err_mask, | |
1445 | qc->result_tf.command, qc->result_tf.feature, | |
1446 | ata_err_string(qc->err_mask)); | |
1447 | } | |
1448 | } | |
1449 | ||
d87fa38e TH |
1450 | static int ata_do_reset(struct ata_port *ap, ata_reset_fn_t reset, |
1451 | unsigned int *classes) | |
1452 | { | |
1453 | int i, rc; | |
1454 | ||
1455 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1456 | classes[i] = ATA_DEV_UNKNOWN; | |
1457 | ||
1458 | rc = reset(ap, classes); | |
1459 | if (rc) | |
1460 | return rc; | |
1461 | ||
1462 | /* If any class isn't ATA_DEV_UNKNOWN, consider classification | |
1463 | * is complete and convert all ATA_DEV_UNKNOWN to | |
1464 | * ATA_DEV_NONE. | |
1465 | */ | |
1466 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1467 | if (classes[i] != ATA_DEV_UNKNOWN) | |
1468 | break; | |
1469 | ||
1470 | if (i < ATA_MAX_DEVICES) | |
1471 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1472 | if (classes[i] == ATA_DEV_UNKNOWN) | |
1473 | classes[i] = ATA_DEV_NONE; | |
1474 | ||
1475 | return 0; | |
1476 | } | |
1477 | ||
664faf09 TH |
1478 | static int ata_eh_followup_srst_needed(int rc, int classify, |
1479 | const unsigned int *classes) | |
1480 | { | |
1481 | if (rc == -EAGAIN) | |
1482 | return 1; | |
1483 | if (rc != 0) | |
1484 | return 0; | |
1485 | if (classify && classes[0] == ATA_DEV_UNKNOWN) | |
1486 | return 1; | |
1487 | return 0; | |
1488 | } | |
1489 | ||
1490 | static int ata_eh_reset(struct ata_port *ap, int classify, | |
f5914a46 | 1491 | ata_prereset_fn_t prereset, ata_reset_fn_t softreset, |
022bdb07 TH |
1492 | ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) |
1493 | { | |
1494 | struct ata_eh_context *ehc = &ap->eh_context; | |
664faf09 | 1495 | unsigned int *classes = ehc->classes; |
022bdb07 | 1496 | int tries = ATA_EH_RESET_TRIES; |
1cdaf534 | 1497 | int verbose = !(ehc->i.flags & ATA_EHI_QUIET); |
f5914a46 | 1498 | unsigned int action; |
022bdb07 | 1499 | ata_reset_fn_t reset; |
664faf09 | 1500 | int i, did_followup_srst, rc; |
022bdb07 | 1501 | |
13abf50d TH |
1502 | /* about to reset */ |
1503 | ata_eh_about_to_do(ap, NULL, ehc->i.action & ATA_EH_RESET_MASK); | |
1504 | ||
f5914a46 TH |
1505 | /* Determine which reset to use and record in ehc->i.action. |
1506 | * prereset() may examine and modify it. | |
1507 | */ | |
1508 | action = ehc->i.action; | |
1509 | ehc->i.action &= ~ATA_EH_RESET_MASK; | |
022bdb07 | 1510 | if (softreset && (!hardreset || (!sata_set_spd_needed(ap) && |
f5914a46 TH |
1511 | !(action & ATA_EH_HARDRESET)))) |
1512 | ehc->i.action |= ATA_EH_SOFTRESET; | |
022bdb07 | 1513 | else |
f5914a46 TH |
1514 | ehc->i.action |= ATA_EH_HARDRESET; |
1515 | ||
1516 | if (prereset) { | |
1517 | rc = prereset(ap); | |
1518 | if (rc) { | |
1519 | ata_port_printk(ap, KERN_ERR, | |
1520 | "prereset failed (errno=%d)\n", rc); | |
1521 | return rc; | |
1522 | } | |
1523 | } | |
1524 | ||
1525 | /* prereset() might have modified ehc->i.action */ | |
1526 | if (ehc->i.action & ATA_EH_HARDRESET) | |
022bdb07 | 1527 | reset = hardreset; |
f5914a46 TH |
1528 | else if (ehc->i.action & ATA_EH_SOFTRESET) |
1529 | reset = softreset; | |
1530 | else { | |
1531 | /* prereset told us not to reset, bang classes and return */ | |
1532 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1533 | classes[i] = ATA_DEV_NONE; | |
1534 | return 0; | |
1535 | } | |
1536 | ||
1537 | /* did prereset() screw up? if so, fix up to avoid oopsing */ | |
1538 | if (!reset) { | |
1539 | ata_port_printk(ap, KERN_ERR, "BUG: prereset() requested " | |
1540 | "invalid reset type\n"); | |
1541 | if (softreset) | |
1542 | reset = softreset; | |
1543 | else | |
1544 | reset = hardreset; | |
1545 | } | |
022bdb07 TH |
1546 | |
1547 | retry: | |
3e706399 TH |
1548 | /* shut up during boot probing */ |
1549 | if (verbose) | |
1550 | ata_port_printk(ap, KERN_INFO, "%s resetting port\n", | |
1551 | reset == softreset ? "soft" : "hard"); | |
022bdb07 | 1552 | |
13abf50d | 1553 | /* mark that this EH session started with reset */ |
022bdb07 TH |
1554 | ehc->i.flags |= ATA_EHI_DID_RESET; |
1555 | ||
1556 | rc = ata_do_reset(ap, reset, classes); | |
1557 | ||
664faf09 TH |
1558 | did_followup_srst = 0; |
1559 | if (reset == hardreset && | |
1560 | ata_eh_followup_srst_needed(rc, classify, classes)) { | |
1561 | /* okay, let's do follow-up softreset */ | |
1562 | did_followup_srst = 1; | |
1563 | reset = softreset; | |
1564 | ||
1565 | if (!reset) { | |
1566 | ata_port_printk(ap, KERN_ERR, | |
1567 | "follow-up softreset required " | |
1568 | "but no softreset avaliable\n"); | |
1569 | return -EINVAL; | |
1570 | } | |
1571 | ||
47005f25 | 1572 | ata_eh_about_to_do(ap, NULL, ATA_EH_RESET_MASK); |
664faf09 TH |
1573 | rc = ata_do_reset(ap, reset, classes); |
1574 | ||
1575 | if (rc == 0 && classify && | |
1576 | classes[0] == ATA_DEV_UNKNOWN) { | |
1577 | ata_port_printk(ap, KERN_ERR, | |
1578 | "classification failed\n"); | |
1579 | return -EINVAL; | |
1580 | } | |
1581 | } | |
1582 | ||
022bdb07 | 1583 | if (rc && --tries) { |
664faf09 TH |
1584 | const char *type; |
1585 | ||
1586 | if (reset == softreset) { | |
1587 | if (did_followup_srst) | |
1588 | type = "follow-up soft"; | |
1589 | else | |
1590 | type = "soft"; | |
1591 | } else | |
1592 | type = "hard"; | |
1593 | ||
022bdb07 | 1594 | ata_port_printk(ap, KERN_WARNING, |
664faf09 | 1595 | "%sreset failed, retrying in 5 secs\n", type); |
022bdb07 TH |
1596 | ssleep(5); |
1597 | ||
1598 | if (reset == hardreset) | |
1599 | sata_down_spd_limit(ap); | |
1600 | if (hardreset) | |
1601 | reset = hardreset; | |
1602 | goto retry; | |
1603 | } | |
1604 | ||
1605 | if (rc == 0) { | |
20952b69 TH |
1606 | /* After the reset, the device state is PIO 0 and the |
1607 | * controller state is undefined. Record the mode. | |
1608 | */ | |
1609 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1610 | ap->device[i].pio_mode = XFER_PIO_0; | |
1611 | ||
022bdb07 TH |
1612 | if (postreset) |
1613 | postreset(ap, classes); | |
1614 | ||
1615 | /* reset successful, schedule revalidation */ | |
13abf50d | 1616 | ata_eh_done(ap, NULL, ehc->i.action & ATA_EH_RESET_MASK); |
022bdb07 TH |
1617 | ehc->i.action |= ATA_EH_REVALIDATE; |
1618 | } | |
1619 | ||
1620 | return rc; | |
1621 | } | |
1622 | ||
084fe639 TH |
1623 | static int ata_eh_revalidate_and_attach(struct ata_port *ap, |
1624 | struct ata_device **r_failed_dev) | |
022bdb07 TH |
1625 | { |
1626 | struct ata_eh_context *ehc = &ap->eh_context; | |
1627 | struct ata_device *dev; | |
084fe639 | 1628 | unsigned long flags; |
022bdb07 TH |
1629 | int i, rc = 0; |
1630 | ||
1631 | DPRINTK("ENTER\n"); | |
1632 | ||
1633 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
47005f25 TH |
1634 | unsigned int action; |
1635 | ||
022bdb07 | 1636 | dev = &ap->device[i]; |
64f65ca6 | 1637 | action = ata_eh_dev_action(dev); |
022bdb07 | 1638 | |
02670bf3 | 1639 | if (action & ATA_EH_REVALIDATE && ata_dev_ready(dev)) { |
022bdb07 TH |
1640 | if (ata_port_offline(ap)) { |
1641 | rc = -EIO; | |
1642 | break; | |
1643 | } | |
1644 | ||
47005f25 | 1645 | ata_eh_about_to_do(ap, dev, ATA_EH_REVALIDATE); |
022bdb07 TH |
1646 | rc = ata_dev_revalidate(dev, |
1647 | ehc->i.flags & ATA_EHI_DID_RESET); | |
1648 | if (rc) | |
1649 | break; | |
1650 | ||
47005f25 TH |
1651 | ata_eh_done(ap, dev, ATA_EH_REVALIDATE); |
1652 | ||
3057ac3c | 1653 | /* schedule the scsi_rescan_device() here */ |
1654 | queue_work(ata_aux_wq, &(ap->scsi_rescan_task)); | |
084fe639 TH |
1655 | } else if (dev->class == ATA_DEV_UNKNOWN && |
1656 | ehc->tries[dev->devno] && | |
1657 | ata_class_enabled(ehc->classes[dev->devno])) { | |
1658 | dev->class = ehc->classes[dev->devno]; | |
1659 | ||
1660 | rc = ata_dev_read_id(dev, &dev->class, 1, dev->id); | |
1661 | if (rc == 0) | |
1662 | rc = ata_dev_configure(dev, 1); | |
1663 | ||
1664 | if (rc) { | |
1665 | dev->class = ATA_DEV_UNKNOWN; | |
1666 | break; | |
1667 | } | |
1668 | ||
ba6a1308 | 1669 | spin_lock_irqsave(ap->lock, flags); |
b51e9e5d | 1670 | ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG; |
ba6a1308 | 1671 | spin_unlock_irqrestore(ap->lock, flags); |
022bdb07 TH |
1672 | } |
1673 | } | |
1674 | ||
47005f25 | 1675 | if (rc) |
022bdb07 TH |
1676 | *r_failed_dev = dev; |
1677 | ||
1678 | DPRINTK("EXIT\n"); | |
1679 | return rc; | |
1680 | } | |
1681 | ||
02670bf3 TH |
1682 | /** |
1683 | * ata_eh_suspend - handle suspend EH action | |
1684 | * @ap: target host port | |
1685 | * @r_failed_dev: result parameter to indicate failing device | |
1686 | * | |
1687 | * Handle suspend EH action. Disk devices are spinned down and | |
1688 | * other types of devices are just marked suspended. Once | |
1689 | * suspended, no EH action to the device is allowed until it is | |
1690 | * resumed. | |
1691 | * | |
1692 | * LOCKING: | |
1693 | * Kernel thread context (may sleep). | |
1694 | * | |
1695 | * RETURNS: | |
1696 | * 0 on success, -errno otherwise | |
1697 | */ | |
1698 | static int ata_eh_suspend(struct ata_port *ap, struct ata_device **r_failed_dev) | |
1699 | { | |
1700 | struct ata_device *dev; | |
1701 | int i, rc = 0; | |
1702 | ||
1703 | DPRINTK("ENTER\n"); | |
1704 | ||
1705 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
1706 | unsigned long flags; | |
1707 | unsigned int action, err_mask; | |
1708 | ||
1709 | dev = &ap->device[i]; | |
1710 | action = ata_eh_dev_action(dev); | |
1711 | ||
1712 | if (!ata_dev_enabled(dev) || !(action & ATA_EH_SUSPEND)) | |
1713 | continue; | |
1714 | ||
1715 | WARN_ON(dev->flags & ATA_DFLAG_SUSPENDED); | |
1716 | ||
1717 | ata_eh_about_to_do(ap, dev, ATA_EH_SUSPEND); | |
1718 | ||
1719 | if (dev->class == ATA_DEV_ATA && !(action & ATA_EH_PM_FREEZE)) { | |
1720 | /* flush cache */ | |
1721 | rc = ata_flush_cache(dev); | |
1722 | if (rc) | |
1723 | break; | |
1724 | ||
1725 | /* spin down */ | |
1726 | err_mask = ata_do_simple_cmd(dev, ATA_CMD_STANDBYNOW1); | |
1727 | if (err_mask) { | |
1728 | ata_dev_printk(dev, KERN_ERR, "failed to " | |
1729 | "spin down (err_mask=0x%x)\n", | |
1730 | err_mask); | |
1731 | rc = -EIO; | |
1732 | break; | |
1733 | } | |
1734 | } | |
1735 | ||
1736 | spin_lock_irqsave(ap->lock, flags); | |
1737 | dev->flags |= ATA_DFLAG_SUSPENDED; | |
1738 | spin_unlock_irqrestore(ap->lock, flags); | |
1739 | ||
1740 | ata_eh_done(ap, dev, ATA_EH_SUSPEND); | |
1741 | } | |
1742 | ||
1743 | if (rc) | |
1744 | *r_failed_dev = dev; | |
1745 | ||
1746 | DPRINTK("EXIT\n"); | |
1747 | return 0; | |
1748 | } | |
1749 | ||
1750 | /** | |
1751 | * ata_eh_prep_resume - prep for resume EH action | |
1752 | * @ap: target host port | |
1753 | * | |
1754 | * Clear SUSPENDED in preparation for scheduled resume actions. | |
1755 | * This allows other parts of EH to access the devices being | |
1756 | * resumed. | |
1757 | * | |
1758 | * LOCKING: | |
1759 | * Kernel thread context (may sleep). | |
1760 | */ | |
1761 | static void ata_eh_prep_resume(struct ata_port *ap) | |
1762 | { | |
1763 | struct ata_device *dev; | |
1764 | unsigned long flags; | |
1765 | int i; | |
1766 | ||
1767 | DPRINTK("ENTER\n"); | |
1768 | ||
1769 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
1770 | unsigned int action; | |
1771 | ||
1772 | dev = &ap->device[i]; | |
1773 | action = ata_eh_dev_action(dev); | |
1774 | ||
1775 | if (!ata_dev_enabled(dev) || !(action & ATA_EH_RESUME)) | |
1776 | continue; | |
1777 | ||
1778 | spin_lock_irqsave(ap->lock, flags); | |
1779 | dev->flags &= ~ATA_DFLAG_SUSPENDED; | |
1780 | spin_unlock_irqrestore(ap->lock, flags); | |
1781 | } | |
1782 | ||
1783 | DPRINTK("EXIT\n"); | |
1784 | } | |
1785 | ||
1786 | /** | |
1787 | * ata_eh_resume - handle resume EH action | |
1788 | * @ap: target host port | |
1789 | * @r_failed_dev: result parameter to indicate failing device | |
1790 | * | |
1791 | * Handle resume EH action. Target devices are already reset and | |
1792 | * revalidated. Spinning up is the only operation left. | |
1793 | * | |
1794 | * LOCKING: | |
1795 | * Kernel thread context (may sleep). | |
1796 | * | |
1797 | * RETURNS: | |
1798 | * 0 on success, -errno otherwise | |
1799 | */ | |
1800 | static int ata_eh_resume(struct ata_port *ap, struct ata_device **r_failed_dev) | |
1801 | { | |
1802 | struct ata_device *dev; | |
1803 | int i, rc = 0; | |
1804 | ||
1805 | DPRINTK("ENTER\n"); | |
1806 | ||
1807 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
1808 | unsigned int action, err_mask; | |
1809 | ||
1810 | dev = &ap->device[i]; | |
1811 | action = ata_eh_dev_action(dev); | |
1812 | ||
1813 | if (!ata_dev_enabled(dev) || !(action & ATA_EH_RESUME)) | |
1814 | continue; | |
1815 | ||
1816 | ata_eh_about_to_do(ap, dev, ATA_EH_RESUME); | |
1817 | ||
1818 | if (dev->class == ATA_DEV_ATA && !(action & ATA_EH_PM_FREEZE)) { | |
1819 | err_mask = ata_do_simple_cmd(dev, | |
1820 | ATA_CMD_IDLEIMMEDIATE); | |
1821 | if (err_mask) { | |
1822 | ata_dev_printk(dev, KERN_ERR, "failed to " | |
1823 | "spin up (err_mask=0x%x)\n", | |
1824 | err_mask); | |
1825 | rc = -EIO; | |
1826 | break; | |
1827 | } | |
1828 | } | |
1829 | ||
1830 | ata_eh_done(ap, dev, ATA_EH_RESUME); | |
1831 | } | |
1832 | ||
1833 | if (rc) | |
1834 | *r_failed_dev = dev; | |
1835 | ||
1836 | DPRINTK("EXIT\n"); | |
1837 | return 0; | |
1838 | } | |
1839 | ||
022bdb07 TH |
1840 | static int ata_port_nr_enabled(struct ata_port *ap) |
1841 | { | |
1842 | int i, cnt = 0; | |
1843 | ||
1844 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1845 | if (ata_dev_enabled(&ap->device[i])) | |
1846 | cnt++; | |
1847 | return cnt; | |
1848 | } | |
1849 | ||
084fe639 TH |
1850 | static int ata_port_nr_vacant(struct ata_port *ap) |
1851 | { | |
1852 | int i, cnt = 0; | |
1853 | ||
1854 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
1855 | if (ap->device[i].class == ATA_DEV_UNKNOWN) | |
1856 | cnt++; | |
1857 | return cnt; | |
1858 | } | |
1859 | ||
1860 | static int ata_eh_skip_recovery(struct ata_port *ap) | |
1861 | { | |
1862 | struct ata_eh_context *ehc = &ap->eh_context; | |
1863 | int i; | |
1864 | ||
02670bf3 TH |
1865 | /* skip if all possible devices are suspended */ |
1866 | for (i = 0; i < ata_port_max_devices(ap); i++) { | |
1867 | struct ata_device *dev = &ap->device[i]; | |
1868 | ||
7c8c2cff | 1869 | if (!(dev->flags & ATA_DFLAG_SUSPENDED)) |
02670bf3 TH |
1870 | break; |
1871 | } | |
1872 | ||
1873 | if (i == ata_port_max_devices(ap)) | |
1874 | return 1; | |
1875 | ||
7c8c2cff TH |
1876 | /* thaw frozen port, resume link and recover failed devices */ |
1877 | if ((ap->pflags & ATA_PFLAG_FROZEN) || | |
1878 | (ehc->i.flags & ATA_EHI_RESUME_LINK) || ata_port_nr_enabled(ap)) | |
084fe639 TH |
1879 | return 0; |
1880 | ||
1881 | /* skip if class codes for all vacant slots are ATA_DEV_NONE */ | |
1882 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
1883 | struct ata_device *dev = &ap->device[i]; | |
1884 | ||
1885 | if (dev->class == ATA_DEV_UNKNOWN && | |
1886 | ehc->classes[dev->devno] != ATA_DEV_NONE) | |
1887 | return 0; | |
1888 | } | |
1889 | ||
1890 | return 1; | |
1891 | } | |
1892 | ||
022bdb07 TH |
1893 | /** |
1894 | * ata_eh_recover - recover host port after error | |
1895 | * @ap: host port to recover | |
f5914a46 | 1896 | * @prereset: prereset method (can be NULL) |
022bdb07 TH |
1897 | * @softreset: softreset method (can be NULL) |
1898 | * @hardreset: hardreset method (can be NULL) | |
1899 | * @postreset: postreset method (can be NULL) | |
1900 | * | |
1901 | * This is the alpha and omega, eum and yang, heart and soul of | |
1902 | * libata exception handling. On entry, actions required to | |
084fe639 TH |
1903 | * recover the port and hotplug requests are recorded in |
1904 | * eh_context. This function executes all the operations with | |
1905 | * appropriate retrials and fallbacks to resurrect failed | |
1906 | * devices, detach goners and greet newcomers. | |
022bdb07 TH |
1907 | * |
1908 | * LOCKING: | |
1909 | * Kernel thread context (may sleep). | |
1910 | * | |
1911 | * RETURNS: | |
1912 | * 0 on success, -errno on failure. | |
1913 | */ | |
f5914a46 TH |
1914 | static int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset, |
1915 | ata_reset_fn_t softreset, ata_reset_fn_t hardreset, | |
022bdb07 TH |
1916 | ata_postreset_fn_t postreset) |
1917 | { | |
1918 | struct ata_eh_context *ehc = &ap->eh_context; | |
1919 | struct ata_device *dev; | |
1920 | int down_xfermask, i, rc; | |
1921 | ||
1922 | DPRINTK("ENTER\n"); | |
1923 | ||
1924 | /* prep for recovery */ | |
1925 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
1926 | dev = &ap->device[i]; | |
1927 | ||
1928 | ehc->tries[dev->devno] = ATA_EH_DEV_TRIES; | |
084fe639 TH |
1929 | |
1930 | /* process hotplug request */ | |
1931 | if (dev->flags & ATA_DFLAG_DETACH) | |
1932 | ata_eh_detach_dev(dev); | |
1933 | ||
1934 | if (!ata_dev_enabled(dev) && | |
1935 | ((ehc->i.probe_mask & (1 << dev->devno)) && | |
1936 | !(ehc->did_probe_mask & (1 << dev->devno)))) { | |
1937 | ata_eh_detach_dev(dev); | |
1938 | ata_dev_init(dev); | |
1939 | ehc->did_probe_mask |= (1 << dev->devno); | |
1940 | ehc->i.action |= ATA_EH_SOFTRESET; | |
1941 | } | |
022bdb07 TH |
1942 | } |
1943 | ||
1944 | retry: | |
1945 | down_xfermask = 0; | |
1946 | rc = 0; | |
1947 | ||
aeb2ecd6 | 1948 | /* if UNLOADING, finish immediately */ |
b51e9e5d | 1949 | if (ap->pflags & ATA_PFLAG_UNLOADING) |
aeb2ecd6 TH |
1950 | goto out; |
1951 | ||
02670bf3 TH |
1952 | /* prep for resume */ |
1953 | ata_eh_prep_resume(ap); | |
1954 | ||
022bdb07 | 1955 | /* skip EH if possible. */ |
084fe639 | 1956 | if (ata_eh_skip_recovery(ap)) |
022bdb07 TH |
1957 | ehc->i.action = 0; |
1958 | ||
084fe639 TH |
1959 | for (i = 0; i < ATA_MAX_DEVICES; i++) |
1960 | ehc->classes[i] = ATA_DEV_UNKNOWN; | |
1961 | ||
022bdb07 TH |
1962 | /* reset */ |
1963 | if (ehc->i.action & ATA_EH_RESET_MASK) { | |
1964 | ata_eh_freeze_port(ap); | |
1965 | ||
084fe639 TH |
1966 | rc = ata_eh_reset(ap, ata_port_nr_vacant(ap), prereset, |
1967 | softreset, hardreset, postreset); | |
022bdb07 TH |
1968 | if (rc) { |
1969 | ata_port_printk(ap, KERN_ERR, | |
1970 | "reset failed, giving up\n"); | |
1971 | goto out; | |
1972 | } | |
1973 | ||
1974 | ata_eh_thaw_port(ap); | |
1975 | } | |
1976 | ||
084fe639 TH |
1977 | /* revalidate existing devices and attach new ones */ |
1978 | rc = ata_eh_revalidate_and_attach(ap, &dev); | |
022bdb07 TH |
1979 | if (rc) |
1980 | goto dev_fail; | |
1981 | ||
02670bf3 TH |
1982 | /* resume devices */ |
1983 | rc = ata_eh_resume(ap, &dev); | |
1984 | if (rc) | |
1985 | goto dev_fail; | |
1986 | ||
022bdb07 TH |
1987 | /* configure transfer mode if the port has been reset */ |
1988 | if (ehc->i.flags & ATA_EHI_DID_RESET) { | |
1989 | rc = ata_set_mode(ap, &dev); | |
1990 | if (rc) { | |
1991 | down_xfermask = 1; | |
1992 | goto dev_fail; | |
1993 | } | |
1994 | } | |
1995 | ||
02670bf3 TH |
1996 | /* suspend devices */ |
1997 | rc = ata_eh_suspend(ap, &dev); | |
1998 | if (rc) | |
1999 | goto dev_fail; | |
2000 | ||
022bdb07 TH |
2001 | goto out; |
2002 | ||
2003 | dev_fail: | |
2004 | switch (rc) { | |
2005 | case -ENODEV: | |
084fe639 TH |
2006 | /* device missing, schedule probing */ |
2007 | ehc->i.probe_mask |= (1 << dev->devno); | |
022bdb07 TH |
2008 | case -EINVAL: |
2009 | ehc->tries[dev->devno] = 0; | |
2010 | break; | |
2011 | case -EIO: | |
2012 | sata_down_spd_limit(ap); | |
2013 | default: | |
2014 | ehc->tries[dev->devno]--; | |
2015 | if (down_xfermask && | |
2016 | ata_down_xfermask_limit(dev, ehc->tries[dev->devno] == 1)) | |
2017 | ehc->tries[dev->devno] = 0; | |
2018 | } | |
2019 | ||
084fe639 TH |
2020 | if (ata_dev_enabled(dev) && !ehc->tries[dev->devno]) { |
2021 | /* disable device if it has used up all its chances */ | |
022bdb07 TH |
2022 | ata_dev_disable(dev); |
2023 | ||
084fe639 TH |
2024 | /* detach if offline */ |
2025 | if (ata_port_offline(ap)) | |
2026 | ata_eh_detach_dev(dev); | |
2027 | ||
2028 | /* probe if requested */ | |
2029 | if ((ehc->i.probe_mask & (1 << dev->devno)) && | |
2030 | !(ehc->did_probe_mask & (1 << dev->devno))) { | |
2031 | ata_eh_detach_dev(dev); | |
2032 | ata_dev_init(dev); | |
2033 | ||
2034 | ehc->tries[dev->devno] = ATA_EH_DEV_TRIES; | |
2035 | ehc->did_probe_mask |= (1 << dev->devno); | |
2036 | ehc->i.action |= ATA_EH_SOFTRESET; | |
2037 | } | |
2038 | } else { | |
2039 | /* soft didn't work? be haaaaard */ | |
2040 | if (ehc->i.flags & ATA_EHI_DID_RESET) | |
2041 | ehc->i.action |= ATA_EH_HARDRESET; | |
2042 | else | |
2043 | ehc->i.action |= ATA_EH_SOFTRESET; | |
2044 | } | |
022bdb07 TH |
2045 | |
2046 | if (ata_port_nr_enabled(ap)) { | |
2047 | ata_port_printk(ap, KERN_WARNING, "failed to recover some " | |
2048 | "devices, retrying in 5 secs\n"); | |
2049 | ssleep(5); | |
2050 | } else { | |
2051 | /* no device left, repeat fast */ | |
2052 | msleep(500); | |
2053 | } | |
2054 | ||
2055 | goto retry; | |
2056 | ||
2057 | out: | |
2058 | if (rc) { | |
2059 | for (i = 0; i < ATA_MAX_DEVICES; i++) | |
2060 | ata_dev_disable(&ap->device[i]); | |
2061 | } | |
2062 | ||
2063 | DPRINTK("EXIT, rc=%d\n", rc); | |
2064 | return rc; | |
2065 | } | |
2066 | ||
2067 | /** | |
2068 | * ata_eh_finish - finish up EH | |
2069 | * @ap: host port to finish EH for | |
2070 | * | |
2071 | * Recovery is complete. Clean up EH states and retry or finish | |
2072 | * failed qcs. | |
2073 | * | |
2074 | * LOCKING: | |
2075 | * None. | |
2076 | */ | |
2077 | static void ata_eh_finish(struct ata_port *ap) | |
2078 | { | |
2079 | int tag; | |
2080 | ||
2081 | /* retry or finish qcs */ | |
2082 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
2083 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
2084 | ||
2085 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
2086 | continue; | |
2087 | ||
2088 | if (qc->err_mask) { | |
2089 | /* FIXME: Once EH migration is complete, | |
2090 | * generate sense data in this function, | |
2091 | * considering both err_mask and tf. | |
2092 | */ | |
2093 | if (qc->err_mask & AC_ERR_INVALID) | |
2094 | ata_eh_qc_complete(qc); | |
2095 | else | |
2096 | ata_eh_qc_retry(qc); | |
2097 | } else { | |
2098 | if (qc->flags & ATA_QCFLAG_SENSE_VALID) { | |
2099 | ata_eh_qc_complete(qc); | |
2100 | } else { | |
2101 | /* feed zero TF to sense generation */ | |
2102 | memset(&qc->result_tf, 0, sizeof(qc->result_tf)); | |
2103 | ata_eh_qc_retry(qc); | |
2104 | } | |
2105 | } | |
2106 | } | |
2107 | } | |
2108 | ||
2109 | /** | |
2110 | * ata_do_eh - do standard error handling | |
2111 | * @ap: host port to handle error for | |
f5914a46 | 2112 | * @prereset: prereset method (can be NULL) |
022bdb07 TH |
2113 | * @softreset: softreset method (can be NULL) |
2114 | * @hardreset: hardreset method (can be NULL) | |
2115 | * @postreset: postreset method (can be NULL) | |
2116 | * | |
2117 | * Perform standard error handling sequence. | |
2118 | * | |
2119 | * LOCKING: | |
2120 | * Kernel thread context (may sleep). | |
2121 | */ | |
f5914a46 TH |
2122 | void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset, |
2123 | ata_reset_fn_t softreset, ata_reset_fn_t hardreset, | |
2124 | ata_postreset_fn_t postreset) | |
022bdb07 | 2125 | { |
1cdaf534 TH |
2126 | ata_eh_autopsy(ap); |
2127 | ata_eh_report(ap); | |
f5914a46 | 2128 | ata_eh_recover(ap, prereset, softreset, hardreset, postreset); |
022bdb07 TH |
2129 | ata_eh_finish(ap); |
2130 | } | |
500530f6 TH |
2131 | |
2132 | /** | |
2133 | * ata_eh_handle_port_suspend - perform port suspend operation | |
2134 | * @ap: port to suspend | |
2135 | * | |
2136 | * Suspend @ap. | |
2137 | * | |
2138 | * LOCKING: | |
2139 | * Kernel thread context (may sleep). | |
2140 | */ | |
2141 | static void ata_eh_handle_port_suspend(struct ata_port *ap) | |
2142 | { | |
2143 | unsigned long flags; | |
2144 | int rc = 0; | |
2145 | ||
2146 | /* are we suspending? */ | |
2147 | spin_lock_irqsave(ap->lock, flags); | |
2148 | if (!(ap->pflags & ATA_PFLAG_PM_PENDING) || | |
2149 | ap->pm_mesg.event == PM_EVENT_ON) { | |
2150 | spin_unlock_irqrestore(ap->lock, flags); | |
2151 | return; | |
2152 | } | |
2153 | spin_unlock_irqrestore(ap->lock, flags); | |
2154 | ||
2155 | WARN_ON(ap->pflags & ATA_PFLAG_SUSPENDED); | |
2156 | ||
2157 | /* suspend */ | |
2158 | ata_eh_freeze_port(ap); | |
2159 | ||
2160 | if (ap->ops->port_suspend) | |
2161 | rc = ap->ops->port_suspend(ap, ap->pm_mesg); | |
2162 | ||
2163 | /* report result */ | |
2164 | spin_lock_irqsave(ap->lock, flags); | |
2165 | ||
2166 | ap->pflags &= ~ATA_PFLAG_PM_PENDING; | |
2167 | if (rc == 0) | |
2168 | ap->pflags |= ATA_PFLAG_SUSPENDED; | |
2169 | else | |
2170 | ata_port_schedule_eh(ap); | |
2171 | ||
2172 | if (ap->pm_result) { | |
2173 | *ap->pm_result = rc; | |
2174 | ap->pm_result = NULL; | |
2175 | } | |
2176 | ||
2177 | spin_unlock_irqrestore(ap->lock, flags); | |
2178 | ||
2179 | return; | |
2180 | } | |
2181 | ||
2182 | /** | |
2183 | * ata_eh_handle_port_resume - perform port resume operation | |
2184 | * @ap: port to resume | |
2185 | * | |
2186 | * Resume @ap. | |
2187 | * | |
2188 | * This function also waits upto one second until all devices | |
2189 | * hanging off this port requests resume EH action. This is to | |
2190 | * prevent invoking EH and thus reset multiple times on resume. | |
2191 | * | |
2192 | * On DPM resume, where some of devices might not be resumed | |
2193 | * together, this may delay port resume upto one second, but such | |
2194 | * DPM resumes are rare and 1 sec delay isn't too bad. | |
2195 | * | |
2196 | * LOCKING: | |
2197 | * Kernel thread context (may sleep). | |
2198 | */ | |
2199 | static void ata_eh_handle_port_resume(struct ata_port *ap) | |
2200 | { | |
2201 | unsigned long timeout; | |
2202 | unsigned long flags; | |
2203 | int i, rc = 0; | |
2204 | ||
2205 | /* are we resuming? */ | |
2206 | spin_lock_irqsave(ap->lock, flags); | |
2207 | if (!(ap->pflags & ATA_PFLAG_PM_PENDING) || | |
2208 | ap->pm_mesg.event != PM_EVENT_ON) { | |
2209 | spin_unlock_irqrestore(ap->lock, flags); | |
2210 | return; | |
2211 | } | |
2212 | spin_unlock_irqrestore(ap->lock, flags); | |
2213 | ||
2214 | /* spurious? */ | |
2215 | if (!(ap->pflags & ATA_PFLAG_SUSPENDED)) | |
2216 | goto done; | |
2217 | ||
2218 | if (ap->ops->port_resume) | |
2219 | rc = ap->ops->port_resume(ap); | |
2220 | ||
2221 | /* give devices time to request EH */ | |
2222 | timeout = jiffies + HZ; /* 1s max */ | |
2223 | while (1) { | |
2224 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | |
2225 | struct ata_device *dev = &ap->device[i]; | |
2226 | unsigned int action = ata_eh_dev_action(dev); | |
2227 | ||
2228 | if ((dev->flags & ATA_DFLAG_SUSPENDED) && | |
2229 | !(action & ATA_EH_RESUME)) | |
2230 | break; | |
2231 | } | |
2232 | ||
2233 | if (i == ATA_MAX_DEVICES || time_after(jiffies, timeout)) | |
2234 | break; | |
2235 | msleep(10); | |
2236 | } | |
2237 | ||
2238 | done: | |
2239 | spin_lock_irqsave(ap->lock, flags); | |
2240 | ap->pflags &= ~(ATA_PFLAG_PM_PENDING | ATA_PFLAG_SUSPENDED); | |
2241 | if (ap->pm_result) { | |
2242 | *ap->pm_result = rc; | |
2243 | ap->pm_result = NULL; | |
2244 | } | |
2245 | spin_unlock_irqrestore(ap->lock, flags); | |
2246 | } |