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