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ece1d636 TH |
1 | /* |
2 | * libata-eh.c - libata error handling | |
3 | * | |
4 | * Maintained by: Jeff Garzik <jgarzik@pobox.com> | |
5 | * Please ALWAYS copy linux-ide@vger.kernel.org | |
6 | * on emails. | |
7 | * | |
8 | * Copyright 2006 Tejun Heo <htejun@gmail.com> | |
9 | * | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License as | |
13 | * published by the Free Software Foundation; either version 2, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
19 | * General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; see the file COPYING. If not, write to | |
23 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, | |
24 | * USA. | |
25 | * | |
26 | * | |
27 | * libata documentation is available via 'make {ps|pdf}docs', | |
28 | * as Documentation/DocBook/libata.* | |
29 | * | |
30 | * Hardware documentation available from http://www.t13.org/ and | |
31 | * http://www.sata-io.org/ | |
32 | * | |
33 | */ | |
34 | ||
ece1d636 TH |
35 | #include <linux/kernel.h> |
36 | #include <scsi/scsi.h> | |
37 | #include <scsi/scsi_host.h> | |
38 | #include <scsi/scsi_eh.h> | |
39 | #include <scsi/scsi_device.h> | |
40 | #include <scsi/scsi_cmnd.h> | |
c6fd2807 | 41 | #include "../scsi/scsi_transport_api.h" |
ece1d636 TH |
42 | |
43 | #include <linux/libata.h> | |
44 | ||
45 | #include "libata.h" | |
46 | ||
7d47e8d4 TH |
47 | enum { |
48 | ATA_EH_SPDN_NCQ_OFF = (1 << 0), | |
49 | ATA_EH_SPDN_SPEED_DOWN = (1 << 1), | |
50 | ATA_EH_SPDN_FALLBACK_TO_PIO = (1 << 2), | |
51 | }; | |
52 | ||
31daabda TH |
53 | /* Waiting in ->prereset can never be reliable. It's sometimes nice |
54 | * to wait there but it can't be depended upon; otherwise, we wouldn't | |
55 | * be resetting. Just give it enough time for most drives to spin up. | |
56 | */ | |
57 | enum { | |
58 | ATA_EH_PRERESET_TIMEOUT = 10 * HZ, | |
5ddf24c5 | 59 | ATA_EH_FASTDRAIN_INTERVAL = 3 * HZ, |
31daabda TH |
60 | }; |
61 | ||
62 | /* The following table determines how we sequence resets. Each entry | |
63 | * represents timeout for that try. The first try can be soft or | |
64 | * hardreset. All others are hardreset if available. In most cases | |
65 | * the first reset w/ 10sec timeout should succeed. Following entries | |
66 | * are mostly for error handling, hotplug and retarded devices. | |
67 | */ | |
68 | static const unsigned long ata_eh_reset_timeouts[] = { | |
69 | 10 * HZ, /* most drives spin up by 10sec */ | |
70 | 10 * HZ, /* > 99% working drives spin up before 20sec */ | |
71 | 35 * HZ, /* give > 30 secs of idleness for retarded devices */ | |
72 | 5 * HZ, /* and sweet one last chance */ | |
73 | /* > 1 min has elapsed, give up */ | |
74 | }; | |
75 | ||
ad9e2762 | 76 | static void __ata_port_freeze(struct ata_port *ap); |
720ba126 | 77 | static void ata_eh_finish(struct ata_port *ap); |
6ffa01d8 | 78 | #ifdef CONFIG_PM |
500530f6 TH |
79 | static void ata_eh_handle_port_suspend(struct ata_port *ap); |
80 | static void ata_eh_handle_port_resume(struct ata_port *ap); | |
6ffa01d8 TH |
81 | #else /* CONFIG_PM */ |
82 | static void ata_eh_handle_port_suspend(struct ata_port *ap) | |
83 | { } | |
84 | ||
85 | static void ata_eh_handle_port_resume(struct ata_port *ap) | |
86 | { } | |
6ffa01d8 | 87 | #endif /* CONFIG_PM */ |
ad9e2762 | 88 | |
b64bbc39 TH |
89 | static void __ata_ehi_pushv_desc(struct ata_eh_info *ehi, const char *fmt, |
90 | va_list args) | |
91 | { | |
92 | ehi->desc_len += vscnprintf(ehi->desc + ehi->desc_len, | |
93 | ATA_EH_DESC_LEN - ehi->desc_len, | |
94 | fmt, args); | |
95 | } | |
96 | ||
97 | /** | |
98 | * __ata_ehi_push_desc - push error description without adding separator | |
99 | * @ehi: target EHI | |
100 | * @fmt: printf format string | |
101 | * | |
102 | * Format string according to @fmt and append it to @ehi->desc. | |
103 | * | |
104 | * LOCKING: | |
105 | * spin_lock_irqsave(host lock) | |
106 | */ | |
107 | void __ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...) | |
108 | { | |
109 | va_list args; | |
110 | ||
111 | va_start(args, fmt); | |
112 | __ata_ehi_pushv_desc(ehi, fmt, args); | |
113 | va_end(args); | |
114 | } | |
115 | ||
116 | /** | |
117 | * ata_ehi_push_desc - push error description with separator | |
118 | * @ehi: target EHI | |
119 | * @fmt: printf format string | |
120 | * | |
121 | * Format string according to @fmt and append it to @ehi->desc. | |
122 | * If @ehi->desc is not empty, ", " is added in-between. | |
123 | * | |
124 | * LOCKING: | |
125 | * spin_lock_irqsave(host lock) | |
126 | */ | |
127 | void ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...) | |
128 | { | |
129 | va_list args; | |
130 | ||
131 | if (ehi->desc_len) | |
132 | __ata_ehi_push_desc(ehi, ", "); | |
133 | ||
134 | va_start(args, fmt); | |
135 | __ata_ehi_pushv_desc(ehi, fmt, args); | |
136 | va_end(args); | |
137 | } | |
138 | ||
139 | /** | |
140 | * ata_ehi_clear_desc - clean error description | |
141 | * @ehi: target EHI | |
142 | * | |
143 | * Clear @ehi->desc. | |
144 | * | |
145 | * LOCKING: | |
146 | * spin_lock_irqsave(host lock) | |
147 | */ | |
148 | void ata_ehi_clear_desc(struct ata_eh_info *ehi) | |
149 | { | |
150 | ehi->desc[0] = '\0'; | |
151 | ehi->desc_len = 0; | |
152 | } | |
153 | ||
0c247c55 TH |
154 | static void ata_ering_record(struct ata_ering *ering, int is_io, |
155 | unsigned int err_mask) | |
156 | { | |
157 | struct ata_ering_entry *ent; | |
158 | ||
159 | WARN_ON(!err_mask); | |
160 | ||
161 | ering->cursor++; | |
162 | ering->cursor %= ATA_ERING_SIZE; | |
163 | ||
164 | ent = &ering->ring[ering->cursor]; | |
165 | ent->is_io = is_io; | |
166 | ent->err_mask = err_mask; | |
167 | ent->timestamp = get_jiffies_64(); | |
168 | } | |
169 | ||
7d47e8d4 | 170 | static void ata_ering_clear(struct ata_ering *ering) |
0c247c55 | 171 | { |
7d47e8d4 | 172 | memset(ering, 0, sizeof(*ering)); |
0c247c55 TH |
173 | } |
174 | ||
175 | static int ata_ering_map(struct ata_ering *ering, | |
176 | int (*map_fn)(struct ata_ering_entry *, void *), | |
177 | void *arg) | |
178 | { | |
179 | int idx, rc = 0; | |
180 | struct ata_ering_entry *ent; | |
181 | ||
182 | idx = ering->cursor; | |
183 | do { | |
184 | ent = &ering->ring[idx]; | |
185 | if (!ent->err_mask) | |
186 | break; | |
187 | rc = map_fn(ent, arg); | |
188 | if (rc) | |
189 | break; | |
190 | idx = (idx - 1 + ATA_ERING_SIZE) % ATA_ERING_SIZE; | |
191 | } while (idx != ering->cursor); | |
192 | ||
193 | return rc; | |
194 | } | |
195 | ||
64f65ca6 TH |
196 | static unsigned int ata_eh_dev_action(struct ata_device *dev) |
197 | { | |
9af5c9c9 | 198 | struct ata_eh_context *ehc = &dev->link->eh_context; |
64f65ca6 TH |
199 | |
200 | return ehc->i.action | ehc->i.dev_action[dev->devno]; | |
201 | } | |
202 | ||
f58229f8 | 203 | static void ata_eh_clear_action(struct ata_link *link, struct ata_device *dev, |
af181c2d TH |
204 | struct ata_eh_info *ehi, unsigned int action) |
205 | { | |
f58229f8 | 206 | struct ata_device *tdev; |
af181c2d TH |
207 | |
208 | if (!dev) { | |
209 | ehi->action &= ~action; | |
f58229f8 TH |
210 | ata_link_for_each_dev(tdev, link) |
211 | ehi->dev_action[tdev->devno] &= ~action; | |
af181c2d TH |
212 | } else { |
213 | /* doesn't make sense for port-wide EH actions */ | |
214 | WARN_ON(!(action & ATA_EH_PERDEV_MASK)); | |
215 | ||
216 | /* break ehi->action into ehi->dev_action */ | |
217 | if (ehi->action & action) { | |
f58229f8 TH |
218 | ata_link_for_each_dev(tdev, link) |
219 | ehi->dev_action[tdev->devno] |= | |
220 | ehi->action & action; | |
af181c2d TH |
221 | ehi->action &= ~action; |
222 | } | |
223 | ||
224 | /* turn off the specified per-dev action */ | |
225 | ehi->dev_action[dev->devno] &= ~action; | |
226 | } | |
227 | } | |
228 | ||
ece1d636 TH |
229 | /** |
230 | * ata_scsi_timed_out - SCSI layer time out callback | |
231 | * @cmd: timed out SCSI command | |
232 | * | |
233 | * Handles SCSI layer timeout. We race with normal completion of | |
234 | * the qc for @cmd. If the qc is already gone, we lose and let | |
235 | * the scsi command finish (EH_HANDLED). Otherwise, the qc has | |
236 | * timed out and EH should be invoked. Prevent ata_qc_complete() | |
237 | * from finishing it by setting EH_SCHEDULED and return | |
238 | * EH_NOT_HANDLED. | |
239 | * | |
ad9e2762 TH |
240 | * TODO: kill this function once old EH is gone. |
241 | * | |
ece1d636 TH |
242 | * LOCKING: |
243 | * Called from timer context | |
244 | * | |
245 | * RETURNS: | |
246 | * EH_HANDLED or EH_NOT_HANDLED | |
247 | */ | |
248 | enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd) | |
249 | { | |
250 | struct Scsi_Host *host = cmd->device->host; | |
35bb94b1 | 251 | struct ata_port *ap = ata_shost_to_port(host); |
ece1d636 TH |
252 | unsigned long flags; |
253 | struct ata_queued_cmd *qc; | |
ad9e2762 | 254 | enum scsi_eh_timer_return ret; |
ece1d636 TH |
255 | |
256 | DPRINTK("ENTER\n"); | |
257 | ||
ad9e2762 TH |
258 | if (ap->ops->error_handler) { |
259 | ret = EH_NOT_HANDLED; | |
260 | goto out; | |
261 | } | |
262 | ||
263 | ret = EH_HANDLED; | |
ba6a1308 | 264 | spin_lock_irqsave(ap->lock, flags); |
9af5c9c9 | 265 | qc = ata_qc_from_tag(ap, ap->link.active_tag); |
ece1d636 TH |
266 | if (qc) { |
267 | WARN_ON(qc->scsicmd != cmd); | |
268 | qc->flags |= ATA_QCFLAG_EH_SCHEDULED; | |
269 | qc->err_mask |= AC_ERR_TIMEOUT; | |
270 | ret = EH_NOT_HANDLED; | |
271 | } | |
ba6a1308 | 272 | spin_unlock_irqrestore(ap->lock, flags); |
ece1d636 | 273 | |
ad9e2762 | 274 | out: |
ece1d636 TH |
275 | DPRINTK("EXIT, ret=%d\n", ret); |
276 | return ret; | |
277 | } | |
278 | ||
279 | /** | |
280 | * ata_scsi_error - SCSI layer error handler callback | |
281 | * @host: SCSI host on which error occurred | |
282 | * | |
283 | * Handles SCSI-layer-thrown error events. | |
284 | * | |
285 | * LOCKING: | |
286 | * Inherited from SCSI layer (none, can sleep) | |
287 | * | |
288 | * RETURNS: | |
289 | * Zero. | |
290 | */ | |
381544bb | 291 | void ata_scsi_error(struct Scsi_Host *host) |
ece1d636 | 292 | { |
35bb94b1 | 293 | struct ata_port *ap = ata_shost_to_port(host); |
ad9e2762 TH |
294 | int i, repeat_cnt = ATA_EH_MAX_REPEAT; |
295 | unsigned long flags; | |
ece1d636 TH |
296 | |
297 | DPRINTK("ENTER\n"); | |
298 | ||
ad9e2762 | 299 | /* synchronize with port task */ |
ece1d636 TH |
300 | ata_port_flush_task(ap); |
301 | ||
cca3974e | 302 | /* synchronize with host lock and sort out timeouts */ |
ad9e2762 TH |
303 | |
304 | /* For new EH, all qcs are finished in one of three ways - | |
305 | * normal completion, error completion, and SCSI timeout. | |
306 | * Both cmpletions can race against SCSI timeout. When normal | |
307 | * completion wins, the qc never reaches EH. When error | |
308 | * completion wins, the qc has ATA_QCFLAG_FAILED set. | |
309 | * | |
310 | * When SCSI timeout wins, things are a bit more complex. | |
311 | * Normal or error completion can occur after the timeout but | |
312 | * before this point. In such cases, both types of | |
313 | * completions are honored. A scmd is determined to have | |
314 | * timed out iff its associated qc is active and not failed. | |
315 | */ | |
316 | if (ap->ops->error_handler) { | |
317 | struct scsi_cmnd *scmd, *tmp; | |
318 | int nr_timedout = 0; | |
319 | ||
e30349d2 | 320 | spin_lock_irqsave(ap->lock, flags); |
ad9e2762 TH |
321 | |
322 | list_for_each_entry_safe(scmd, tmp, &host->eh_cmd_q, eh_entry) { | |
323 | struct ata_queued_cmd *qc; | |
324 | ||
325 | for (i = 0; i < ATA_MAX_QUEUE; i++) { | |
326 | qc = __ata_qc_from_tag(ap, i); | |
327 | if (qc->flags & ATA_QCFLAG_ACTIVE && | |
328 | qc->scsicmd == scmd) | |
329 | break; | |
330 | } | |
331 | ||
332 | if (i < ATA_MAX_QUEUE) { | |
333 | /* the scmd has an associated qc */ | |
334 | if (!(qc->flags & ATA_QCFLAG_FAILED)) { | |
335 | /* which hasn't failed yet, timeout */ | |
336 | qc->err_mask |= AC_ERR_TIMEOUT; | |
337 | qc->flags |= ATA_QCFLAG_FAILED; | |
338 | nr_timedout++; | |
339 | } | |
340 | } else { | |
341 | /* Normal completion occurred after | |
342 | * SCSI timeout but before this point. | |
343 | * Successfully complete it. | |
344 | */ | |
345 | scmd->retries = scmd->allowed; | |
346 | scsi_eh_finish_cmd(scmd, &ap->eh_done_q); | |
347 | } | |
348 | } | |
349 | ||
350 | /* If we have timed out qcs. They belong to EH from | |
351 | * this point but the state of the controller is | |
352 | * unknown. Freeze the port to make sure the IRQ | |
353 | * handler doesn't diddle with those qcs. This must | |
354 | * be done atomically w.r.t. setting QCFLAG_FAILED. | |
355 | */ | |
356 | if (nr_timedout) | |
357 | __ata_port_freeze(ap); | |
358 | ||
e30349d2 | 359 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 | 360 | } else |
e30349d2 | 361 | spin_unlock_wait(ap->lock); |
ad9e2762 TH |
362 | |
363 | repeat: | |
364 | /* invoke error handler */ | |
365 | if (ap->ops->error_handler) { | |
5ddf24c5 TH |
366 | /* kill fast drain timer */ |
367 | del_timer_sync(&ap->fastdrain_timer); | |
368 | ||
500530f6 TH |
369 | /* process port resume request */ |
370 | ata_eh_handle_port_resume(ap); | |
371 | ||
f3e81b19 | 372 | /* fetch & clear EH info */ |
e30349d2 | 373 | spin_lock_irqsave(ap->lock, flags); |
f3e81b19 | 374 | |
9af5c9c9 TH |
375 | memset(&ap->link.eh_context, 0, sizeof(ap->link.eh_context)); |
376 | ap->link.eh_context.i = ap->link.eh_info; | |
377 | memset(&ap->link.eh_info, 0, sizeof(ap->link.eh_info)); | |
f3e81b19 | 378 | |
b51e9e5d TH |
379 | ap->pflags |= ATA_PFLAG_EH_IN_PROGRESS; |
380 | ap->pflags &= ~ATA_PFLAG_EH_PENDING; | |
f3e81b19 | 381 | |
e30349d2 | 382 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 | 383 | |
500530f6 TH |
384 | /* invoke EH, skip if unloading or suspended */ |
385 | if (!(ap->pflags & (ATA_PFLAG_UNLOADING | ATA_PFLAG_SUSPENDED))) | |
720ba126 TH |
386 | ap->ops->error_handler(ap); |
387 | else | |
388 | ata_eh_finish(ap); | |
ad9e2762 | 389 | |
500530f6 TH |
390 | /* process port suspend request */ |
391 | ata_eh_handle_port_suspend(ap); | |
392 | ||
ad9e2762 TH |
393 | /* Exception might have happend after ->error_handler |
394 | * recovered the port but before this point. Repeat | |
395 | * EH in such case. | |
396 | */ | |
e30349d2 | 397 | spin_lock_irqsave(ap->lock, flags); |
ad9e2762 | 398 | |
b51e9e5d | 399 | if (ap->pflags & ATA_PFLAG_EH_PENDING) { |
ad9e2762 TH |
400 | if (--repeat_cnt) { |
401 | ata_port_printk(ap, KERN_INFO, | |
402 | "EH pending after completion, " | |
403 | "repeating EH (cnt=%d)\n", repeat_cnt); | |
e30349d2 | 404 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 TH |
405 | goto repeat; |
406 | } | |
407 | ata_port_printk(ap, KERN_ERR, "EH pending after %d " | |
408 | "tries, giving up\n", ATA_EH_MAX_REPEAT); | |
914616a3 | 409 | ap->pflags &= ~ATA_PFLAG_EH_PENDING; |
ad9e2762 TH |
410 | } |
411 | ||
f3e81b19 | 412 | /* this run is complete, make sure EH info is clear */ |
9af5c9c9 | 413 | memset(&ap->link.eh_info, 0, sizeof(ap->link.eh_info)); |
f3e81b19 | 414 | |
e30349d2 | 415 | /* Clear host_eh_scheduled while holding ap->lock such |
ad9e2762 TH |
416 | * that if exception occurs after this point but |
417 | * before EH completion, SCSI midlayer will | |
418 | * re-initiate EH. | |
419 | */ | |
420 | host->host_eh_scheduled = 0; | |
421 | ||
e30349d2 | 422 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 | 423 | } else { |
9af5c9c9 | 424 | WARN_ON(ata_qc_from_tag(ap, ap->link.active_tag) == NULL); |
ad9e2762 TH |
425 | ap->ops->eng_timeout(ap); |
426 | } | |
ece1d636 | 427 | |
ad9e2762 | 428 | /* finish or retry handled scmd's and clean up */ |
ece1d636 TH |
429 | WARN_ON(host->host_failed || !list_empty(&host->eh_cmd_q)); |
430 | ||
431 | scsi_eh_flush_done_q(&ap->eh_done_q); | |
432 | ||
ad9e2762 | 433 | /* clean up */ |
e30349d2 | 434 | spin_lock_irqsave(ap->lock, flags); |
ad9e2762 | 435 | |
1cdaf534 | 436 | if (ap->pflags & ATA_PFLAG_LOADING) |
b51e9e5d | 437 | ap->pflags &= ~ATA_PFLAG_LOADING; |
1cdaf534 | 438 | else if (ap->pflags & ATA_PFLAG_SCSI_HOTPLUG) |
52bad64d | 439 | queue_delayed_work(ata_aux_wq, &ap->hotplug_task, 0); |
1cdaf534 TH |
440 | |
441 | if (ap->pflags & ATA_PFLAG_RECOVERED) | |
442 | ata_port_printk(ap, KERN_INFO, "EH complete\n"); | |
580b2102 | 443 | |
b51e9e5d | 444 | ap->pflags &= ~(ATA_PFLAG_SCSI_HOTPLUG | ATA_PFLAG_RECOVERED); |
ad9e2762 | 445 | |
c6cf9e99 | 446 | /* tell wait_eh that we're done */ |
b51e9e5d | 447 | ap->pflags &= ~ATA_PFLAG_EH_IN_PROGRESS; |
c6cf9e99 TH |
448 | wake_up_all(&ap->eh_wait_q); |
449 | ||
e30349d2 | 450 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 | 451 | |
ece1d636 | 452 | DPRINTK("EXIT\n"); |
ece1d636 TH |
453 | } |
454 | ||
c6cf9e99 TH |
455 | /** |
456 | * ata_port_wait_eh - Wait for the currently pending EH to complete | |
457 | * @ap: Port to wait EH for | |
458 | * | |
459 | * Wait until the currently pending EH is complete. | |
460 | * | |
461 | * LOCKING: | |
462 | * Kernel thread context (may sleep). | |
463 | */ | |
464 | void ata_port_wait_eh(struct ata_port *ap) | |
465 | { | |
466 | unsigned long flags; | |
467 | DEFINE_WAIT(wait); | |
468 | ||
469 | retry: | |
ba6a1308 | 470 | spin_lock_irqsave(ap->lock, flags); |
c6cf9e99 | 471 | |
b51e9e5d | 472 | while (ap->pflags & (ATA_PFLAG_EH_PENDING | ATA_PFLAG_EH_IN_PROGRESS)) { |
c6cf9e99 | 473 | prepare_to_wait(&ap->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE); |
ba6a1308 | 474 | spin_unlock_irqrestore(ap->lock, flags); |
c6cf9e99 | 475 | schedule(); |
ba6a1308 | 476 | spin_lock_irqsave(ap->lock, flags); |
c6cf9e99 | 477 | } |
0a1b622e | 478 | finish_wait(&ap->eh_wait_q, &wait); |
c6cf9e99 | 479 | |
ba6a1308 | 480 | spin_unlock_irqrestore(ap->lock, flags); |
c6cf9e99 TH |
481 | |
482 | /* make sure SCSI EH is complete */ | |
cca3974e | 483 | if (scsi_host_in_recovery(ap->scsi_host)) { |
c6cf9e99 TH |
484 | msleep(10); |
485 | goto retry; | |
486 | } | |
487 | } | |
488 | ||
ece1d636 TH |
489 | /** |
490 | * ata_qc_timeout - Handle timeout of queued command | |
491 | * @qc: Command that timed out | |
492 | * | |
493 | * Some part of the kernel (currently, only the SCSI layer) | |
494 | * has noticed that the active command on port @ap has not | |
495 | * completed after a specified length of time. Handle this | |
496 | * condition by disabling DMA (if necessary) and completing | |
497 | * transactions, with error if necessary. | |
498 | * | |
499 | * This also handles the case of the "lost interrupt", where | |
500 | * for some reason (possibly hardware bug, possibly driver bug) | |
501 | * an interrupt was not delivered to the driver, even though the | |
502 | * transaction completed successfully. | |
503 | * | |
ad9e2762 TH |
504 | * TODO: kill this function once old EH is gone. |
505 | * | |
ece1d636 TH |
506 | * LOCKING: |
507 | * Inherited from SCSI layer (none, can sleep) | |
508 | */ | |
509 | static void ata_qc_timeout(struct ata_queued_cmd *qc) | |
510 | { | |
511 | struct ata_port *ap = qc->ap; | |
ece1d636 TH |
512 | u8 host_stat = 0, drv_stat; |
513 | unsigned long flags; | |
514 | ||
515 | DPRINTK("ENTER\n"); | |
516 | ||
517 | ap->hsm_task_state = HSM_ST_IDLE; | |
518 | ||
ba6a1308 | 519 | spin_lock_irqsave(ap->lock, flags); |
ece1d636 TH |
520 | |
521 | switch (qc->tf.protocol) { | |
522 | ||
523 | case ATA_PROT_DMA: | |
524 | case ATA_PROT_ATAPI_DMA: | |
525 | host_stat = ap->ops->bmdma_status(ap); | |
526 | ||
527 | /* before we do anything else, clear DMA-Start bit */ | |
528 | ap->ops->bmdma_stop(qc); | |
529 | ||
530 | /* fall through */ | |
531 | ||
532 | default: | |
533 | ata_altstatus(ap); | |
534 | drv_stat = ata_chk_status(ap); | |
535 | ||
536 | /* ack bmdma irq events */ | |
537 | ap->ops->irq_clear(ap); | |
538 | ||
f15a1daf TH |
539 | ata_dev_printk(qc->dev, KERN_ERR, "command 0x%x timeout, " |
540 | "stat 0x%x host_stat 0x%x\n", | |
541 | qc->tf.command, drv_stat, host_stat); | |
ece1d636 TH |
542 | |
543 | /* complete taskfile transaction */ | |
c13b56a1 | 544 | qc->err_mask |= AC_ERR_TIMEOUT; |
ece1d636 TH |
545 | break; |
546 | } | |
547 | ||
ba6a1308 | 548 | spin_unlock_irqrestore(ap->lock, flags); |
ece1d636 TH |
549 | |
550 | ata_eh_qc_complete(qc); | |
551 | ||
552 | DPRINTK("EXIT\n"); | |
553 | } | |
554 | ||
555 | /** | |
556 | * ata_eng_timeout - Handle timeout of queued command | |
557 | * @ap: Port on which timed-out command is active | |
558 | * | |
559 | * Some part of the kernel (currently, only the SCSI layer) | |
560 | * has noticed that the active command on port @ap has not | |
561 | * completed after a specified length of time. Handle this | |
562 | * condition by disabling DMA (if necessary) and completing | |
563 | * transactions, with error if necessary. | |
564 | * | |
565 | * This also handles the case of the "lost interrupt", where | |
566 | * for some reason (possibly hardware bug, possibly driver bug) | |
567 | * an interrupt was not delivered to the driver, even though the | |
568 | * transaction completed successfully. | |
569 | * | |
ad9e2762 TH |
570 | * TODO: kill this function once old EH is gone. |
571 | * | |
ece1d636 TH |
572 | * LOCKING: |
573 | * Inherited from SCSI layer (none, can sleep) | |
574 | */ | |
575 | void ata_eng_timeout(struct ata_port *ap) | |
576 | { | |
577 | DPRINTK("ENTER\n"); | |
578 | ||
9af5c9c9 | 579 | ata_qc_timeout(ata_qc_from_tag(ap, ap->link.active_tag)); |
ece1d636 TH |
580 | |
581 | DPRINTK("EXIT\n"); | |
582 | } | |
583 | ||
5ddf24c5 TH |
584 | static int ata_eh_nr_in_flight(struct ata_port *ap) |
585 | { | |
586 | unsigned int tag; | |
587 | int nr = 0; | |
588 | ||
589 | /* count only non-internal commands */ | |
590 | for (tag = 0; tag < ATA_MAX_QUEUE - 1; tag++) | |
591 | if (ata_qc_from_tag(ap, tag)) | |
592 | nr++; | |
593 | ||
594 | return nr; | |
595 | } | |
596 | ||
597 | void ata_eh_fastdrain_timerfn(unsigned long arg) | |
598 | { | |
599 | struct ata_port *ap = (void *)arg; | |
600 | unsigned long flags; | |
601 | int cnt; | |
602 | ||
603 | spin_lock_irqsave(ap->lock, flags); | |
604 | ||
605 | cnt = ata_eh_nr_in_flight(ap); | |
606 | ||
607 | /* are we done? */ | |
608 | if (!cnt) | |
609 | goto out_unlock; | |
610 | ||
611 | if (cnt == ap->fastdrain_cnt) { | |
612 | unsigned int tag; | |
613 | ||
614 | /* No progress during the last interval, tag all | |
615 | * in-flight qcs as timed out and freeze the port. | |
616 | */ | |
617 | for (tag = 0; tag < ATA_MAX_QUEUE - 1; tag++) { | |
618 | struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag); | |
619 | if (qc) | |
620 | qc->err_mask |= AC_ERR_TIMEOUT; | |
621 | } | |
622 | ||
623 | ata_port_freeze(ap); | |
624 | } else { | |
625 | /* some qcs have finished, give it another chance */ | |
626 | ap->fastdrain_cnt = cnt; | |
627 | ap->fastdrain_timer.expires = | |
628 | jiffies + ATA_EH_FASTDRAIN_INTERVAL; | |
629 | add_timer(&ap->fastdrain_timer); | |
630 | } | |
631 | ||
632 | out_unlock: | |
633 | spin_unlock_irqrestore(ap->lock, flags); | |
634 | } | |
635 | ||
636 | /** | |
637 | * ata_eh_set_pending - set ATA_PFLAG_EH_PENDING and activate fast drain | |
638 | * @ap: target ATA port | |
639 | * @fastdrain: activate fast drain | |
640 | * | |
641 | * Set ATA_PFLAG_EH_PENDING and activate fast drain if @fastdrain | |
642 | * is non-zero and EH wasn't pending before. Fast drain ensures | |
643 | * that EH kicks in in timely manner. | |
644 | * | |
645 | * LOCKING: | |
646 | * spin_lock_irqsave(host lock) | |
647 | */ | |
648 | static void ata_eh_set_pending(struct ata_port *ap, int fastdrain) | |
649 | { | |
650 | int cnt; | |
651 | ||
652 | /* already scheduled? */ | |
653 | if (ap->pflags & ATA_PFLAG_EH_PENDING) | |
654 | return; | |
655 | ||
656 | ap->pflags |= ATA_PFLAG_EH_PENDING; | |
657 | ||
658 | if (!fastdrain) | |
659 | return; | |
660 | ||
661 | /* do we have in-flight qcs? */ | |
662 | cnt = ata_eh_nr_in_flight(ap); | |
663 | if (!cnt) | |
664 | return; | |
665 | ||
666 | /* activate fast drain */ | |
667 | ap->fastdrain_cnt = cnt; | |
668 | ap->fastdrain_timer.expires = jiffies + ATA_EH_FASTDRAIN_INTERVAL; | |
669 | add_timer(&ap->fastdrain_timer); | |
670 | } | |
671 | ||
f686bcb8 TH |
672 | /** |
673 | * ata_qc_schedule_eh - schedule qc for error handling | |
674 | * @qc: command to schedule error handling for | |
675 | * | |
676 | * Schedule error handling for @qc. EH will kick in as soon as | |
677 | * other commands are drained. | |
678 | * | |
679 | * LOCKING: | |
cca3974e | 680 | * spin_lock_irqsave(host lock) |
f686bcb8 TH |
681 | */ |
682 | void ata_qc_schedule_eh(struct ata_queued_cmd *qc) | |
683 | { | |
684 | struct ata_port *ap = qc->ap; | |
685 | ||
686 | WARN_ON(!ap->ops->error_handler); | |
687 | ||
688 | qc->flags |= ATA_QCFLAG_FAILED; | |
5ddf24c5 | 689 | ata_eh_set_pending(ap, 1); |
f686bcb8 TH |
690 | |
691 | /* The following will fail if timeout has already expired. | |
692 | * ata_scsi_error() takes care of such scmds on EH entry. | |
693 | * Note that ATA_QCFLAG_FAILED is unconditionally set after | |
694 | * this function completes. | |
695 | */ | |
696 | scsi_req_abort_cmd(qc->scsicmd); | |
697 | } | |
698 | ||
7b70fc03 TH |
699 | /** |
700 | * ata_port_schedule_eh - schedule error handling without a qc | |
701 | * @ap: ATA port to schedule EH for | |
702 | * | |
703 | * Schedule error handling for @ap. EH will kick in as soon as | |
704 | * all commands are drained. | |
705 | * | |
706 | * LOCKING: | |
cca3974e | 707 | * spin_lock_irqsave(host lock) |
7b70fc03 TH |
708 | */ |
709 | void ata_port_schedule_eh(struct ata_port *ap) | |
710 | { | |
711 | WARN_ON(!ap->ops->error_handler); | |
712 | ||
f4d6d004 TH |
713 | if (ap->pflags & ATA_PFLAG_INITIALIZING) |
714 | return; | |
715 | ||
5ddf24c5 | 716 | ata_eh_set_pending(ap, 1); |
cca3974e | 717 | scsi_schedule_eh(ap->scsi_host); |
7b70fc03 TH |
718 | |
719 | DPRINTK("port EH scheduled\n"); | |
720 | } | |
721 | ||
722 | /** | |
723 | * ata_port_abort - abort all qc's on the port | |
724 | * @ap: ATA port to abort qc's for | |
725 | * | |
726 | * Abort all active qc's of @ap and schedule EH. | |
727 | * | |
728 | * LOCKING: | |
cca3974e | 729 | * spin_lock_irqsave(host lock) |
7b70fc03 TH |
730 | * |
731 | * RETURNS: | |
732 | * Number of aborted qc's. | |
733 | */ | |
734 | int ata_port_abort(struct ata_port *ap) | |
735 | { | |
736 | int tag, nr_aborted = 0; | |
737 | ||
738 | WARN_ON(!ap->ops->error_handler); | |
739 | ||
5ddf24c5 TH |
740 | /* we're gonna abort all commands, no need for fast drain */ |
741 | ata_eh_set_pending(ap, 0); | |
742 | ||
7b70fc03 TH |
743 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { |
744 | struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag); | |
745 | ||
746 | if (qc) { | |
747 | qc->flags |= ATA_QCFLAG_FAILED; | |
748 | ata_qc_complete(qc); | |
749 | nr_aborted++; | |
750 | } | |
751 | } | |
752 | ||
753 | if (!nr_aborted) | |
754 | ata_port_schedule_eh(ap); | |
755 | ||
756 | return nr_aborted; | |
757 | } | |
758 | ||
e3180499 TH |
759 | /** |
760 | * __ata_port_freeze - freeze port | |
761 | * @ap: ATA port to freeze | |
762 | * | |
763 | * This function is called when HSM violation or some other | |
764 | * condition disrupts normal operation of the port. Frozen port | |
765 | * is not allowed to perform any operation until the port is | |
766 | * thawed, which usually follows a successful reset. | |
767 | * | |
768 | * ap->ops->freeze() callback can be used for freezing the port | |
769 | * hardware-wise (e.g. mask interrupt and stop DMA engine). If a | |
770 | * port cannot be frozen hardware-wise, the interrupt handler | |
771 | * must ack and clear interrupts unconditionally while the port | |
772 | * is frozen. | |
773 | * | |
774 | * LOCKING: | |
cca3974e | 775 | * spin_lock_irqsave(host lock) |
e3180499 TH |
776 | */ |
777 | static void __ata_port_freeze(struct ata_port *ap) | |
778 | { | |
779 | WARN_ON(!ap->ops->error_handler); | |
780 | ||
781 | if (ap->ops->freeze) | |
782 | ap->ops->freeze(ap); | |
783 | ||
b51e9e5d | 784 | ap->pflags |= ATA_PFLAG_FROZEN; |
e3180499 | 785 | |
44877b4e | 786 | DPRINTK("ata%u port frozen\n", ap->print_id); |
e3180499 TH |
787 | } |
788 | ||
789 | /** | |
790 | * ata_port_freeze - abort & freeze port | |
791 | * @ap: ATA port to freeze | |
792 | * | |
793 | * Abort and freeze @ap. | |
794 | * | |
795 | * LOCKING: | |
cca3974e | 796 | * spin_lock_irqsave(host lock) |
e3180499 TH |
797 | * |
798 | * RETURNS: | |
799 | * Number of aborted commands. | |
800 | */ | |
801 | int ata_port_freeze(struct ata_port *ap) | |
802 | { | |
803 | int nr_aborted; | |
804 | ||
805 | WARN_ON(!ap->ops->error_handler); | |
806 | ||
807 | nr_aborted = ata_port_abort(ap); | |
808 | __ata_port_freeze(ap); | |
809 | ||
810 | return nr_aborted; | |
811 | } | |
812 | ||
813 | /** | |
814 | * ata_eh_freeze_port - EH helper to freeze port | |
815 | * @ap: ATA port to freeze | |
816 | * | |
817 | * Freeze @ap. | |
818 | * | |
819 | * LOCKING: | |
820 | * None. | |
821 | */ | |
822 | void ata_eh_freeze_port(struct ata_port *ap) | |
823 | { | |
824 | unsigned long flags; | |
825 | ||
826 | if (!ap->ops->error_handler) | |
827 | return; | |
828 | ||
ba6a1308 | 829 | spin_lock_irqsave(ap->lock, flags); |
e3180499 | 830 | __ata_port_freeze(ap); |
ba6a1308 | 831 | spin_unlock_irqrestore(ap->lock, flags); |
e3180499 TH |
832 | } |
833 | ||
834 | /** | |
835 | * ata_port_thaw_port - EH helper to thaw port | |
836 | * @ap: ATA port to thaw | |
837 | * | |
838 | * Thaw frozen port @ap. | |
839 | * | |
840 | * LOCKING: | |
841 | * None. | |
842 | */ | |
843 | void ata_eh_thaw_port(struct ata_port *ap) | |
844 | { | |
845 | unsigned long flags; | |
846 | ||
847 | if (!ap->ops->error_handler) | |
848 | return; | |
849 | ||
ba6a1308 | 850 | spin_lock_irqsave(ap->lock, flags); |
e3180499 | 851 | |
b51e9e5d | 852 | ap->pflags &= ~ATA_PFLAG_FROZEN; |
e3180499 TH |
853 | |
854 | if (ap->ops->thaw) | |
855 | ap->ops->thaw(ap); | |
856 | ||
ba6a1308 | 857 | spin_unlock_irqrestore(ap->lock, flags); |
e3180499 | 858 | |
44877b4e | 859 | DPRINTK("ata%u port thawed\n", ap->print_id); |
e3180499 TH |
860 | } |
861 | ||
ece1d636 TH |
862 | static void ata_eh_scsidone(struct scsi_cmnd *scmd) |
863 | { | |
864 | /* nada */ | |
865 | } | |
866 | ||
867 | static void __ata_eh_qc_complete(struct ata_queued_cmd *qc) | |
868 | { | |
869 | struct ata_port *ap = qc->ap; | |
870 | struct scsi_cmnd *scmd = qc->scsicmd; | |
871 | unsigned long flags; | |
872 | ||
ba6a1308 | 873 | spin_lock_irqsave(ap->lock, flags); |
ece1d636 TH |
874 | qc->scsidone = ata_eh_scsidone; |
875 | __ata_qc_complete(qc); | |
876 | WARN_ON(ata_tag_valid(qc->tag)); | |
ba6a1308 | 877 | spin_unlock_irqrestore(ap->lock, flags); |
ece1d636 TH |
878 | |
879 | scsi_eh_finish_cmd(scmd, &ap->eh_done_q); | |
880 | } | |
881 | ||
882 | /** | |
883 | * ata_eh_qc_complete - Complete an active ATA command from EH | |
884 | * @qc: Command to complete | |
885 | * | |
886 | * Indicate to the mid and upper layers that an ATA command has | |
887 | * completed. To be used from EH. | |
888 | */ | |
889 | void ata_eh_qc_complete(struct ata_queued_cmd *qc) | |
890 | { | |
891 | struct scsi_cmnd *scmd = qc->scsicmd; | |
892 | scmd->retries = scmd->allowed; | |
893 | __ata_eh_qc_complete(qc); | |
894 | } | |
895 | ||
896 | /** | |
897 | * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH | |
898 | * @qc: Command to retry | |
899 | * | |
900 | * Indicate to the mid and upper layers that an ATA command | |
901 | * should be retried. To be used from EH. | |
902 | * | |
903 | * SCSI midlayer limits the number of retries to scmd->allowed. | |
904 | * scmd->retries is decremented for commands which get retried | |
905 | * due to unrelated failures (qc->err_mask is zero). | |
906 | */ | |
907 | void ata_eh_qc_retry(struct ata_queued_cmd *qc) | |
908 | { | |
909 | struct scsi_cmnd *scmd = qc->scsicmd; | |
910 | if (!qc->err_mask && scmd->retries) | |
911 | scmd->retries--; | |
912 | __ata_eh_qc_complete(qc); | |
913 | } | |
022bdb07 | 914 | |
0ea035a3 TH |
915 | /** |
916 | * ata_eh_detach_dev - detach ATA device | |
917 | * @dev: ATA device to detach | |
918 | * | |
919 | * Detach @dev. | |
920 | * | |
921 | * LOCKING: | |
922 | * None. | |
923 | */ | |
924 | static void ata_eh_detach_dev(struct ata_device *dev) | |
925 | { | |
f58229f8 TH |
926 | struct ata_link *link = dev->link; |
927 | struct ata_port *ap = link->ap; | |
0ea035a3 TH |
928 | unsigned long flags; |
929 | ||
930 | ata_dev_disable(dev); | |
931 | ||
ba6a1308 | 932 | spin_lock_irqsave(ap->lock, flags); |
0ea035a3 TH |
933 | |
934 | dev->flags &= ~ATA_DFLAG_DETACH; | |
935 | ||
936 | if (ata_scsi_offline_dev(dev)) { | |
937 | dev->flags |= ATA_DFLAG_DETACHED; | |
b51e9e5d | 938 | ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG; |
0ea035a3 TH |
939 | } |
940 | ||
beb07c1a | 941 | /* clear per-dev EH actions */ |
f58229f8 TH |
942 | ata_eh_clear_action(link, dev, &link->eh_info, ATA_EH_PERDEV_MASK); |
943 | ata_eh_clear_action(link, dev, &link->eh_context.i, ATA_EH_PERDEV_MASK); | |
beb07c1a | 944 | |
ba6a1308 | 945 | spin_unlock_irqrestore(ap->lock, flags); |
0ea035a3 TH |
946 | } |
947 | ||
022bdb07 TH |
948 | /** |
949 | * ata_eh_about_to_do - about to perform eh_action | |
955e57df | 950 | * @link: target ATA link |
47005f25 | 951 | * @dev: target ATA dev for per-dev action (can be NULL) |
022bdb07 TH |
952 | * @action: action about to be performed |
953 | * | |
954 | * Called just before performing EH actions to clear related bits | |
955e57df TH |
955 | * in @link->eh_info such that eh actions are not unnecessarily |
956 | * repeated. | |
022bdb07 TH |
957 | * |
958 | * LOCKING: | |
959 | * None. | |
960 | */ | |
955e57df | 961 | static void ata_eh_about_to_do(struct ata_link *link, struct ata_device *dev, |
47005f25 | 962 | unsigned int action) |
022bdb07 | 963 | { |
955e57df TH |
964 | struct ata_port *ap = link->ap; |
965 | struct ata_eh_info *ehi = &link->eh_info; | |
966 | struct ata_eh_context *ehc = &link->eh_context; | |
022bdb07 TH |
967 | unsigned long flags; |
968 | ||
ba6a1308 | 969 | spin_lock_irqsave(ap->lock, flags); |
1cdaf534 | 970 | |
13abf50d TH |
971 | /* Reset is represented by combination of actions and EHI |
972 | * flags. Suck in all related bits before clearing eh_info to | |
973 | * avoid losing requested action. | |
974 | */ | |
975 | if (action & ATA_EH_RESET_MASK) { | |
976 | ehc->i.action |= ehi->action & ATA_EH_RESET_MASK; | |
977 | ehc->i.flags |= ehi->flags & ATA_EHI_RESET_MODIFIER_MASK; | |
978 | ||
979 | /* make sure all reset actions are cleared & clear EHI flags */ | |
980 | action |= ATA_EH_RESET_MASK; | |
981 | ehi->flags &= ~ATA_EHI_RESET_MODIFIER_MASK; | |
982 | } | |
983 | ||
955e57df | 984 | ata_eh_clear_action(link, dev, ehi, action); |
1cdaf534 | 985 | |
13abf50d | 986 | if (!(ehc->i.flags & ATA_EHI_QUIET)) |
1cdaf534 TH |
987 | ap->pflags |= ATA_PFLAG_RECOVERED; |
988 | ||
ba6a1308 | 989 | spin_unlock_irqrestore(ap->lock, flags); |
022bdb07 TH |
990 | } |
991 | ||
47005f25 TH |
992 | /** |
993 | * ata_eh_done - EH action complete | |
955e57df | 994 | * @ap: target ATA port |
47005f25 TH |
995 | * @dev: target ATA dev for per-dev action (can be NULL) |
996 | * @action: action just completed | |
997 | * | |
998 | * Called right after performing EH actions to clear related bits | |
955e57df | 999 | * in @link->eh_context. |
47005f25 TH |
1000 | * |
1001 | * LOCKING: | |
1002 | * None. | |
1003 | */ | |
955e57df | 1004 | static void ata_eh_done(struct ata_link *link, struct ata_device *dev, |
47005f25 TH |
1005 | unsigned int action) |
1006 | { | |
955e57df | 1007 | struct ata_eh_context *ehc = &link->eh_context; |
9af5c9c9 | 1008 | |
13abf50d TH |
1009 | /* if reset is complete, clear all reset actions & reset modifier */ |
1010 | if (action & ATA_EH_RESET_MASK) { | |
1011 | action |= ATA_EH_RESET_MASK; | |
9af5c9c9 | 1012 | ehc->i.flags &= ~ATA_EHI_RESET_MODIFIER_MASK; |
13abf50d TH |
1013 | } |
1014 | ||
955e57df | 1015 | ata_eh_clear_action(link, dev, &ehc->i, action); |
47005f25 TH |
1016 | } |
1017 | ||
022bdb07 TH |
1018 | /** |
1019 | * ata_err_string - convert err_mask to descriptive string | |
1020 | * @err_mask: error mask to convert to string | |
1021 | * | |
1022 | * Convert @err_mask to descriptive string. Errors are | |
1023 | * prioritized according to severity and only the most severe | |
1024 | * error is reported. | |
1025 | * | |
1026 | * LOCKING: | |
1027 | * None. | |
1028 | * | |
1029 | * RETURNS: | |
1030 | * Descriptive string for @err_mask | |
1031 | */ | |
1032 | static const char * ata_err_string(unsigned int err_mask) | |
1033 | { | |
1034 | if (err_mask & AC_ERR_HOST_BUS) | |
1035 | return "host bus error"; | |
1036 | if (err_mask & AC_ERR_ATA_BUS) | |
1037 | return "ATA bus error"; | |
1038 | if (err_mask & AC_ERR_TIMEOUT) | |
1039 | return "timeout"; | |
1040 | if (err_mask & AC_ERR_HSM) | |
1041 | return "HSM violation"; | |
1042 | if (err_mask & AC_ERR_SYSTEM) | |
1043 | return "internal error"; | |
1044 | if (err_mask & AC_ERR_MEDIA) | |
1045 | return "media error"; | |
1046 | if (err_mask & AC_ERR_INVALID) | |
1047 | return "invalid argument"; | |
1048 | if (err_mask & AC_ERR_DEV) | |
1049 | return "device error"; | |
1050 | return "unknown error"; | |
1051 | } | |
1052 | ||
e8ee8451 TH |
1053 | /** |
1054 | * ata_read_log_page - read a specific log page | |
1055 | * @dev: target device | |
1056 | * @page: page to read | |
1057 | * @buf: buffer to store read page | |
1058 | * @sectors: number of sectors to read | |
1059 | * | |
1060 | * Read log page using READ_LOG_EXT command. | |
1061 | * | |
1062 | * LOCKING: | |
1063 | * Kernel thread context (may sleep). | |
1064 | * | |
1065 | * RETURNS: | |
1066 | * 0 on success, AC_ERR_* mask otherwise. | |
1067 | */ | |
1068 | static unsigned int ata_read_log_page(struct ata_device *dev, | |
1069 | u8 page, void *buf, unsigned int sectors) | |
1070 | { | |
1071 | struct ata_taskfile tf; | |
1072 | unsigned int err_mask; | |
1073 | ||
1074 | DPRINTK("read log page - page %d\n", page); | |
1075 | ||
1076 | ata_tf_init(dev, &tf); | |
1077 | tf.command = ATA_CMD_READ_LOG_EXT; | |
1078 | tf.lbal = page; | |
1079 | tf.nsect = sectors; | |
1080 | tf.hob_nsect = sectors >> 8; | |
1081 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_LBA48 | ATA_TFLAG_DEVICE; | |
1082 | tf.protocol = ATA_PROT_PIO; | |
1083 | ||
1084 | err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE, | |
1085 | buf, sectors * ATA_SECT_SIZE); | |
1086 | ||
1087 | DPRINTK("EXIT, err_mask=%x\n", err_mask); | |
1088 | return err_mask; | |
1089 | } | |
1090 | ||
1091 | /** | |
1092 | * ata_eh_read_log_10h - Read log page 10h for NCQ error details | |
1093 | * @dev: Device to read log page 10h from | |
1094 | * @tag: Resulting tag of the failed command | |
1095 | * @tf: Resulting taskfile registers of the failed command | |
1096 | * | |
1097 | * Read log page 10h to obtain NCQ error details and clear error | |
1098 | * condition. | |
1099 | * | |
1100 | * LOCKING: | |
1101 | * Kernel thread context (may sleep). | |
1102 | * | |
1103 | * RETURNS: | |
1104 | * 0 on success, -errno otherwise. | |
1105 | */ | |
1106 | static int ata_eh_read_log_10h(struct ata_device *dev, | |
1107 | int *tag, struct ata_taskfile *tf) | |
1108 | { | |
9af5c9c9 | 1109 | u8 *buf = dev->link->ap->sector_buf; |
e8ee8451 TH |
1110 | unsigned int err_mask; |
1111 | u8 csum; | |
1112 | int i; | |
1113 | ||
1114 | err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, buf, 1); | |
1115 | if (err_mask) | |
1116 | return -EIO; | |
1117 | ||
1118 | csum = 0; | |
1119 | for (i = 0; i < ATA_SECT_SIZE; i++) | |
1120 | csum += buf[i]; | |
1121 | if (csum) | |
1122 | ata_dev_printk(dev, KERN_WARNING, | |
1123 | "invalid checksum 0x%x on log page 10h\n", csum); | |
1124 | ||
1125 | if (buf[0] & 0x80) | |
1126 | return -ENOENT; | |
1127 | ||
1128 | *tag = buf[0] & 0x1f; | |
1129 | ||
1130 | tf->command = buf[2]; | |
1131 | tf->feature = buf[3]; | |
1132 | tf->lbal = buf[4]; | |
1133 | tf->lbam = buf[5]; | |
1134 | tf->lbah = buf[6]; | |
1135 | tf->device = buf[7]; | |
1136 | tf->hob_lbal = buf[8]; | |
1137 | tf->hob_lbam = buf[9]; | |
1138 | tf->hob_lbah = buf[10]; | |
1139 | tf->nsect = buf[12]; | |
1140 | tf->hob_nsect = buf[13]; | |
1141 | ||
1142 | return 0; | |
1143 | } | |
1144 | ||
022bdb07 TH |
1145 | /** |
1146 | * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE | |
1147 | * @dev: device to perform REQUEST_SENSE to | |
1148 | * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long) | |
1149 | * | |
1150 | * Perform ATAPI REQUEST_SENSE after the device reported CHECK | |
1151 | * SENSE. This function is EH helper. | |
1152 | * | |
1153 | * LOCKING: | |
1154 | * Kernel thread context (may sleep). | |
1155 | * | |
1156 | * RETURNS: | |
1157 | * 0 on success, AC_ERR_* mask on failure | |
1158 | */ | |
56287768 | 1159 | static unsigned int atapi_eh_request_sense(struct ata_queued_cmd *qc) |
022bdb07 | 1160 | { |
56287768 AL |
1161 | struct ata_device *dev = qc->dev; |
1162 | unsigned char *sense_buf = qc->scsicmd->sense_buffer; | |
9af5c9c9 | 1163 | struct ata_port *ap = dev->link->ap; |
022bdb07 TH |
1164 | struct ata_taskfile tf; |
1165 | u8 cdb[ATAPI_CDB_LEN]; | |
1166 | ||
1167 | DPRINTK("ATAPI request sense\n"); | |
1168 | ||
022bdb07 TH |
1169 | /* FIXME: is this needed? */ |
1170 | memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE); | |
1171 | ||
56287768 AL |
1172 | /* initialize sense_buf with the error register, |
1173 | * for the case where they are -not- overwritten | |
1174 | */ | |
022bdb07 | 1175 | sense_buf[0] = 0x70; |
56287768 AL |
1176 | sense_buf[2] = qc->result_tf.feature >> 4; |
1177 | ||
a617c09f | 1178 | /* some devices time out if garbage left in tf */ |
56287768 | 1179 | ata_tf_init(dev, &tf); |
022bdb07 TH |
1180 | |
1181 | memset(cdb, 0, ATAPI_CDB_LEN); | |
1182 | cdb[0] = REQUEST_SENSE; | |
1183 | cdb[4] = SCSI_SENSE_BUFFERSIZE; | |
1184 | ||
1185 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; | |
1186 | tf.command = ATA_CMD_PACKET; | |
1187 | ||
1188 | /* is it pointless to prefer PIO for "safety reasons"? */ | |
1189 | if (ap->flags & ATA_FLAG_PIO_DMA) { | |
1190 | tf.protocol = ATA_PROT_ATAPI_DMA; | |
1191 | tf.feature |= ATAPI_PKT_DMA; | |
1192 | } else { | |
1193 | tf.protocol = ATA_PROT_ATAPI; | |
1194 | tf.lbam = (8 * 1024) & 0xff; | |
1195 | tf.lbah = (8 * 1024) >> 8; | |
1196 | } | |
1197 | ||
1198 | return ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE, | |
1199 | sense_buf, SCSI_SENSE_BUFFERSIZE); | |
1200 | } | |
1201 | ||
1202 | /** | |
1203 | * ata_eh_analyze_serror - analyze SError for a failed port | |
1204 | * @ap: ATA port to analyze SError for | |
1205 | * | |
1206 | * Analyze SError if available and further determine cause of | |
1207 | * failure. | |
1208 | * | |
1209 | * LOCKING: | |
1210 | * None. | |
1211 | */ | |
1212 | static void ata_eh_analyze_serror(struct ata_port *ap) | |
1213 | { | |
9af5c9c9 | 1214 | struct ata_eh_context *ehc = &ap->link.eh_context; |
022bdb07 TH |
1215 | u32 serror = ehc->i.serror; |
1216 | unsigned int err_mask = 0, action = 0; | |
1217 | ||
1218 | if (serror & SERR_PERSISTENT) { | |
1219 | err_mask |= AC_ERR_ATA_BUS; | |
1220 | action |= ATA_EH_HARDRESET; | |
1221 | } | |
1222 | if (serror & | |
1223 | (SERR_DATA_RECOVERED | SERR_COMM_RECOVERED | SERR_DATA)) { | |
1224 | err_mask |= AC_ERR_ATA_BUS; | |
1225 | action |= ATA_EH_SOFTRESET; | |
1226 | } | |
1227 | if (serror & SERR_PROTOCOL) { | |
1228 | err_mask |= AC_ERR_HSM; | |
1229 | action |= ATA_EH_SOFTRESET; | |
1230 | } | |
1231 | if (serror & SERR_INTERNAL) { | |
1232 | err_mask |= AC_ERR_SYSTEM; | |
771b8dad | 1233 | action |= ATA_EH_HARDRESET; |
022bdb07 | 1234 | } |
084fe639 TH |
1235 | if (serror & (SERR_PHYRDY_CHG | SERR_DEV_XCHG)) |
1236 | ata_ehi_hotplugged(&ehc->i); | |
022bdb07 TH |
1237 | |
1238 | ehc->i.err_mask |= err_mask; | |
1239 | ehc->i.action |= action; | |
1240 | } | |
1241 | ||
e8ee8451 TH |
1242 | /** |
1243 | * ata_eh_analyze_ncq_error - analyze NCQ error | |
1244 | * @ap: ATA port to analyze NCQ error for | |
1245 | * | |
1246 | * Read log page 10h, determine the offending qc and acquire | |
1247 | * error status TF. For NCQ device errors, all LLDDs have to do | |
1248 | * is setting AC_ERR_DEV in ehi->err_mask. This function takes | |
1249 | * care of the rest. | |
1250 | * | |
1251 | * LOCKING: | |
1252 | * Kernel thread context (may sleep). | |
1253 | */ | |
1254 | static void ata_eh_analyze_ncq_error(struct ata_port *ap) | |
1255 | { | |
9af5c9c9 TH |
1256 | struct ata_eh_context *ehc = &ap->link.eh_context; |
1257 | struct ata_device *dev = ap->link.device; | |
e8ee8451 TH |
1258 | struct ata_queued_cmd *qc; |
1259 | struct ata_taskfile tf; | |
1260 | int tag, rc; | |
1261 | ||
1262 | /* if frozen, we can't do much */ | |
b51e9e5d | 1263 | if (ap->pflags & ATA_PFLAG_FROZEN) |
e8ee8451 TH |
1264 | return; |
1265 | ||
1266 | /* is it NCQ device error? */ | |
9af5c9c9 | 1267 | if (!ap->link.sactive || !(ehc->i.err_mask & AC_ERR_DEV)) |
e8ee8451 TH |
1268 | return; |
1269 | ||
1270 | /* has LLDD analyzed already? */ | |
1271 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1272 | qc = __ata_qc_from_tag(ap, tag); | |
1273 | ||
1274 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
1275 | continue; | |
1276 | ||
1277 | if (qc->err_mask) | |
1278 | return; | |
1279 | } | |
1280 | ||
1281 | /* okay, this error is ours */ | |
1282 | rc = ata_eh_read_log_10h(dev, &tag, &tf); | |
1283 | if (rc) { | |
1284 | ata_port_printk(ap, KERN_ERR, "failed to read log page 10h " | |
1285 | "(errno=%d)\n", rc); | |
1286 | return; | |
1287 | } | |
1288 | ||
9af5c9c9 | 1289 | if (!(ap->link.sactive & (1 << tag))) { |
e8ee8451 TH |
1290 | ata_port_printk(ap, KERN_ERR, "log page 10h reported " |
1291 | "inactive tag %d\n", tag); | |
1292 | return; | |
1293 | } | |
1294 | ||
1295 | /* we've got the perpetrator, condemn it */ | |
1296 | qc = __ata_qc_from_tag(ap, tag); | |
1297 | memcpy(&qc->result_tf, &tf, sizeof(tf)); | |
5335b729 | 1298 | qc->err_mask |= AC_ERR_DEV | AC_ERR_NCQ; |
e8ee8451 TH |
1299 | ehc->i.err_mask &= ~AC_ERR_DEV; |
1300 | } | |
1301 | ||
022bdb07 TH |
1302 | /** |
1303 | * ata_eh_analyze_tf - analyze taskfile of a failed qc | |
1304 | * @qc: qc to analyze | |
1305 | * @tf: Taskfile registers to analyze | |
1306 | * | |
1307 | * Analyze taskfile of @qc and further determine cause of | |
1308 | * failure. This function also requests ATAPI sense data if | |
1309 | * avaliable. | |
1310 | * | |
1311 | * LOCKING: | |
1312 | * Kernel thread context (may sleep). | |
1313 | * | |
1314 | * RETURNS: | |
1315 | * Determined recovery action | |
1316 | */ | |
1317 | static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd *qc, | |
1318 | const struct ata_taskfile *tf) | |
1319 | { | |
1320 | unsigned int tmp, action = 0; | |
1321 | u8 stat = tf->command, err = tf->feature; | |
1322 | ||
1323 | if ((stat & (ATA_BUSY | ATA_DRQ | ATA_DRDY)) != ATA_DRDY) { | |
1324 | qc->err_mask |= AC_ERR_HSM; | |
1325 | return ATA_EH_SOFTRESET; | |
1326 | } | |
1327 | ||
a51d644a TH |
1328 | if (stat & (ATA_ERR | ATA_DF)) |
1329 | qc->err_mask |= AC_ERR_DEV; | |
1330 | else | |
022bdb07 TH |
1331 | return 0; |
1332 | ||
1333 | switch (qc->dev->class) { | |
1334 | case ATA_DEV_ATA: | |
1335 | if (err & ATA_ICRC) | |
1336 | qc->err_mask |= AC_ERR_ATA_BUS; | |
1337 | if (err & ATA_UNC) | |
1338 | qc->err_mask |= AC_ERR_MEDIA; | |
1339 | if (err & ATA_IDNF) | |
1340 | qc->err_mask |= AC_ERR_INVALID; | |
1341 | break; | |
1342 | ||
1343 | case ATA_DEV_ATAPI: | |
a569a30d | 1344 | if (!(qc->ap->pflags & ATA_PFLAG_FROZEN)) { |
56287768 | 1345 | tmp = atapi_eh_request_sense(qc); |
a569a30d TH |
1346 | if (!tmp) { |
1347 | /* ATA_QCFLAG_SENSE_VALID is used to | |
1348 | * tell atapi_qc_complete() that sense | |
1349 | * data is already valid. | |
1350 | * | |
1351 | * TODO: interpret sense data and set | |
1352 | * appropriate err_mask. | |
1353 | */ | |
1354 | qc->flags |= ATA_QCFLAG_SENSE_VALID; | |
1355 | } else | |
1356 | qc->err_mask |= tmp; | |
1357 | } | |
022bdb07 TH |
1358 | } |
1359 | ||
1360 | if (qc->err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT | AC_ERR_ATA_BUS)) | |
1361 | action |= ATA_EH_SOFTRESET; | |
1362 | ||
1363 | return action; | |
1364 | } | |
1365 | ||
7d47e8d4 | 1366 | static int ata_eh_categorize_error(int is_io, unsigned int err_mask) |
022bdb07 | 1367 | { |
7d47e8d4 | 1368 | if (err_mask & AC_ERR_ATA_BUS) |
022bdb07 TH |
1369 | return 1; |
1370 | ||
7d47e8d4 TH |
1371 | if (err_mask & AC_ERR_TIMEOUT) |
1372 | return 2; | |
1373 | ||
1374 | if (is_io) { | |
1375 | if (err_mask & AC_ERR_HSM) | |
022bdb07 | 1376 | return 2; |
7d47e8d4 TH |
1377 | if ((err_mask & |
1378 | (AC_ERR_DEV|AC_ERR_MEDIA|AC_ERR_INVALID)) == AC_ERR_DEV) | |
1379 | return 3; | |
022bdb07 TH |
1380 | } |
1381 | ||
1382 | return 0; | |
1383 | } | |
1384 | ||
7d47e8d4 | 1385 | struct speed_down_verdict_arg { |
022bdb07 | 1386 | u64 since; |
7d47e8d4 | 1387 | int nr_errors[4]; |
022bdb07 TH |
1388 | }; |
1389 | ||
7d47e8d4 | 1390 | static int speed_down_verdict_cb(struct ata_ering_entry *ent, void *void_arg) |
022bdb07 | 1391 | { |
7d47e8d4 TH |
1392 | struct speed_down_verdict_arg *arg = void_arg; |
1393 | int cat = ata_eh_categorize_error(ent->is_io, ent->err_mask); | |
022bdb07 TH |
1394 | |
1395 | if (ent->timestamp < arg->since) | |
1396 | return -1; | |
1397 | ||
7d47e8d4 | 1398 | arg->nr_errors[cat]++; |
022bdb07 TH |
1399 | return 0; |
1400 | } | |
1401 | ||
1402 | /** | |
7d47e8d4 | 1403 | * ata_eh_speed_down_verdict - Determine speed down verdict |
022bdb07 TH |
1404 | * @dev: Device of interest |
1405 | * | |
1406 | * This function examines error ring of @dev and determines | |
7d47e8d4 TH |
1407 | * whether NCQ needs to be turned off, transfer speed should be |
1408 | * stepped down, or falling back to PIO is necessary. | |
022bdb07 | 1409 | * |
7d47e8d4 | 1410 | * Cat-1 is ATA_BUS error for any command. |
022bdb07 | 1411 | * |
7d47e8d4 TH |
1412 | * Cat-2 is TIMEOUT for any command or HSM violation for known |
1413 | * supported commands. | |
1414 | * | |
1415 | * Cat-3 is is unclassified DEV error for known supported | |
022bdb07 TH |
1416 | * command. |
1417 | * | |
7d47e8d4 TH |
1418 | * NCQ needs to be turned off if there have been more than 3 |
1419 | * Cat-2 + Cat-3 errors during last 10 minutes. | |
1420 | * | |
1421 | * Speed down is necessary if there have been more than 3 Cat-1 + | |
1422 | * Cat-2 errors or 10 Cat-3 errors during last 10 minutes. | |
1423 | * | |
1424 | * Falling back to PIO mode is necessary if there have been more | |
1425 | * than 10 Cat-1 + Cat-2 + Cat-3 errors during last 5 minutes. | |
1426 | * | |
022bdb07 TH |
1427 | * LOCKING: |
1428 | * Inherited from caller. | |
1429 | * | |
1430 | * RETURNS: | |
7d47e8d4 | 1431 | * OR of ATA_EH_SPDN_* flags. |
022bdb07 | 1432 | */ |
7d47e8d4 | 1433 | static unsigned int ata_eh_speed_down_verdict(struct ata_device *dev) |
022bdb07 | 1434 | { |
7d47e8d4 TH |
1435 | const u64 j5mins = 5LLU * 60 * HZ, j10mins = 10LLU * 60 * HZ; |
1436 | u64 j64 = get_jiffies_64(); | |
1437 | struct speed_down_verdict_arg arg; | |
1438 | unsigned int verdict = 0; | |
022bdb07 | 1439 | |
7d47e8d4 TH |
1440 | /* scan past 10 mins of error history */ |
1441 | memset(&arg, 0, sizeof(arg)); | |
1442 | arg.since = j64 - min(j64, j10mins); | |
1443 | ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg); | |
022bdb07 | 1444 | |
7d47e8d4 TH |
1445 | if (arg.nr_errors[2] + arg.nr_errors[3] > 3) |
1446 | verdict |= ATA_EH_SPDN_NCQ_OFF; | |
1447 | if (arg.nr_errors[1] + arg.nr_errors[2] > 3 || arg.nr_errors[3] > 10) | |
1448 | verdict |= ATA_EH_SPDN_SPEED_DOWN; | |
022bdb07 | 1449 | |
7d47e8d4 | 1450 | /* scan past 3 mins of error history */ |
022bdb07 | 1451 | memset(&arg, 0, sizeof(arg)); |
7d47e8d4 TH |
1452 | arg.since = j64 - min(j64, j5mins); |
1453 | ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg); | |
022bdb07 | 1454 | |
7d47e8d4 TH |
1455 | if (arg.nr_errors[1] + arg.nr_errors[2] + arg.nr_errors[3] > 10) |
1456 | verdict |= ATA_EH_SPDN_FALLBACK_TO_PIO; | |
022bdb07 | 1457 | |
7d47e8d4 | 1458 | return verdict; |
022bdb07 TH |
1459 | } |
1460 | ||
1461 | /** | |
1462 | * ata_eh_speed_down - record error and speed down if necessary | |
1463 | * @dev: Failed device | |
1464 | * @is_io: Did the device fail during normal IO? | |
1465 | * @err_mask: err_mask of the error | |
1466 | * | |
1467 | * Record error and examine error history to determine whether | |
1468 | * adjusting transmission speed is necessary. It also sets | |
1469 | * transmission limits appropriately if such adjustment is | |
1470 | * necessary. | |
1471 | * | |
1472 | * LOCKING: | |
1473 | * Kernel thread context (may sleep). | |
1474 | * | |
1475 | * RETURNS: | |
7d47e8d4 | 1476 | * Determined recovery action. |
022bdb07 | 1477 | */ |
7d47e8d4 TH |
1478 | static unsigned int ata_eh_speed_down(struct ata_device *dev, int is_io, |
1479 | unsigned int err_mask) | |
022bdb07 | 1480 | { |
7d47e8d4 TH |
1481 | unsigned int verdict; |
1482 | unsigned int action = 0; | |
1483 | ||
1484 | /* don't bother if Cat-0 error */ | |
1485 | if (ata_eh_categorize_error(is_io, err_mask) == 0) | |
022bdb07 TH |
1486 | return 0; |
1487 | ||
1488 | /* record error and determine whether speed down is necessary */ | |
1489 | ata_ering_record(&dev->ering, is_io, err_mask); | |
7d47e8d4 | 1490 | verdict = ata_eh_speed_down_verdict(dev); |
022bdb07 | 1491 | |
7d47e8d4 TH |
1492 | /* turn off NCQ? */ |
1493 | if ((verdict & ATA_EH_SPDN_NCQ_OFF) && | |
1494 | (dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ | | |
1495 | ATA_DFLAG_NCQ_OFF)) == ATA_DFLAG_NCQ) { | |
1496 | dev->flags |= ATA_DFLAG_NCQ_OFF; | |
1497 | ata_dev_printk(dev, KERN_WARNING, | |
1498 | "NCQ disabled due to excessive errors\n"); | |
1499 | goto done; | |
1500 | } | |
022bdb07 | 1501 | |
7d47e8d4 TH |
1502 | /* speed down? */ |
1503 | if (verdict & ATA_EH_SPDN_SPEED_DOWN) { | |
1504 | /* speed down SATA link speed if possible */ | |
936fd732 | 1505 | if (sata_down_spd_limit(dev->link) == 0) { |
7d47e8d4 TH |
1506 | action |= ATA_EH_HARDRESET; |
1507 | goto done; | |
1508 | } | |
022bdb07 | 1509 | |
7d47e8d4 TH |
1510 | /* lower transfer mode */ |
1511 | if (dev->spdn_cnt < 2) { | |
1512 | static const int dma_dnxfer_sel[] = | |
1513 | { ATA_DNXFER_DMA, ATA_DNXFER_40C }; | |
1514 | static const int pio_dnxfer_sel[] = | |
1515 | { ATA_DNXFER_PIO, ATA_DNXFER_FORCE_PIO0 }; | |
1516 | int sel; | |
1517 | ||
1518 | if (dev->xfer_shift != ATA_SHIFT_PIO) | |
1519 | sel = dma_dnxfer_sel[dev->spdn_cnt]; | |
1520 | else | |
1521 | sel = pio_dnxfer_sel[dev->spdn_cnt]; | |
1522 | ||
1523 | dev->spdn_cnt++; | |
1524 | ||
1525 | if (ata_down_xfermask_limit(dev, sel) == 0) { | |
1526 | action |= ATA_EH_SOFTRESET; | |
1527 | goto done; | |
1528 | } | |
1529 | } | |
1530 | } | |
1531 | ||
1532 | /* Fall back to PIO? Slowing down to PIO is meaningless for | |
1533 | * SATA. Consider it only for PATA. | |
1534 | */ | |
1535 | if ((verdict & ATA_EH_SPDN_FALLBACK_TO_PIO) && (dev->spdn_cnt >= 2) && | |
9af5c9c9 | 1536 | (dev->link->ap->cbl != ATA_CBL_SATA) && |
7d47e8d4 TH |
1537 | (dev->xfer_shift != ATA_SHIFT_PIO)) { |
1538 | if (ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO) == 0) { | |
1539 | dev->spdn_cnt = 0; | |
1540 | action |= ATA_EH_SOFTRESET; | |
1541 | goto done; | |
1542 | } | |
1543 | } | |
022bdb07 | 1544 | |
022bdb07 | 1545 | return 0; |
7d47e8d4 TH |
1546 | done: |
1547 | /* device has been slowed down, blow error history */ | |
1548 | ata_ering_clear(&dev->ering); | |
1549 | return action; | |
022bdb07 TH |
1550 | } |
1551 | ||
1552 | /** | |
1553 | * ata_eh_autopsy - analyze error and determine recovery action | |
1554 | * @ap: ATA port to perform autopsy on | |
1555 | * | |
1556 | * Analyze why @ap failed and determine which recovery action is | |
1557 | * needed. This function also sets more detailed AC_ERR_* values | |
1558 | * and fills sense data for ATAPI CHECK SENSE. | |
1559 | * | |
1560 | * LOCKING: | |
1561 | * Kernel thread context (may sleep). | |
1562 | */ | |
1563 | static void ata_eh_autopsy(struct ata_port *ap) | |
1564 | { | |
936fd732 TH |
1565 | struct ata_link *link = &ap->link; |
1566 | struct ata_eh_context *ehc = &link->eh_context; | |
022bdb07 TH |
1567 | unsigned int all_err_mask = 0; |
1568 | int tag, is_io = 0; | |
1569 | u32 serror; | |
1570 | int rc; | |
1571 | ||
1572 | DPRINTK("ENTER\n"); | |
1573 | ||
1cdaf534 TH |
1574 | if (ehc->i.flags & ATA_EHI_NO_AUTOPSY) |
1575 | return; | |
1576 | ||
022bdb07 | 1577 | /* obtain and analyze SError */ |
936fd732 | 1578 | rc = sata_scr_read(link, SCR_ERROR, &serror); |
022bdb07 TH |
1579 | if (rc == 0) { |
1580 | ehc->i.serror |= serror; | |
1581 | ata_eh_analyze_serror(ap); | |
4e57c517 TH |
1582 | } else if (rc != -EOPNOTSUPP) { |
1583 | /* SError read failed, force hardreset and probing */ | |
1584 | ata_ehi_schedule_probe(&ehc->i); | |
4528e4da | 1585 | ehc->i.action |= ATA_EH_HARDRESET; |
4e57c517 TH |
1586 | ehc->i.err_mask |= AC_ERR_OTHER; |
1587 | } | |
022bdb07 | 1588 | |
e8ee8451 TH |
1589 | /* analyze NCQ failure */ |
1590 | ata_eh_analyze_ncq_error(ap); | |
1591 | ||
022bdb07 TH |
1592 | /* any real error trumps AC_ERR_OTHER */ |
1593 | if (ehc->i.err_mask & ~AC_ERR_OTHER) | |
1594 | ehc->i.err_mask &= ~AC_ERR_OTHER; | |
1595 | ||
1596 | all_err_mask |= ehc->i.err_mask; | |
1597 | ||
1598 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1599 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
1600 | ||
1601 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
1602 | continue; | |
1603 | ||
1604 | /* inherit upper level err_mask */ | |
1605 | qc->err_mask |= ehc->i.err_mask; | |
1606 | ||
022bdb07 | 1607 | /* analyze TF */ |
4528e4da | 1608 | ehc->i.action |= ata_eh_analyze_tf(qc, &qc->result_tf); |
022bdb07 TH |
1609 | |
1610 | /* DEV errors are probably spurious in case of ATA_BUS error */ | |
1611 | if (qc->err_mask & AC_ERR_ATA_BUS) | |
1612 | qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_MEDIA | | |
1613 | AC_ERR_INVALID); | |
1614 | ||
1615 | /* any real error trumps unknown error */ | |
1616 | if (qc->err_mask & ~AC_ERR_OTHER) | |
1617 | qc->err_mask &= ~AC_ERR_OTHER; | |
1618 | ||
1619 | /* SENSE_VALID trumps dev/unknown error and revalidation */ | |
1620 | if (qc->flags & ATA_QCFLAG_SENSE_VALID) { | |
1621 | qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_OTHER); | |
4528e4da | 1622 | ehc->i.action &= ~ATA_EH_REVALIDATE; |
022bdb07 TH |
1623 | } |
1624 | ||
1625 | /* accumulate error info */ | |
4528e4da | 1626 | ehc->i.dev = qc->dev; |
022bdb07 TH |
1627 | all_err_mask |= qc->err_mask; |
1628 | if (qc->flags & ATA_QCFLAG_IO) | |
1629 | is_io = 1; | |
1630 | } | |
1631 | ||
a20f33ff | 1632 | /* enforce default EH actions */ |
b51e9e5d | 1633 | if (ap->pflags & ATA_PFLAG_FROZEN || |
a20f33ff | 1634 | all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT)) |
4528e4da | 1635 | ehc->i.action |= ATA_EH_SOFTRESET; |
a20f33ff | 1636 | else if (all_err_mask) |
4528e4da | 1637 | ehc->i.action |= ATA_EH_REVALIDATE; |
022bdb07 | 1638 | |
47005f25 | 1639 | /* if we have offending qcs and the associated failed device */ |
4528e4da | 1640 | if (ehc->i.dev) { |
47005f25 | 1641 | /* speed down */ |
4528e4da TH |
1642 | ehc->i.action |= ata_eh_speed_down(ehc->i.dev, is_io, |
1643 | all_err_mask); | |
47005f25 TH |
1644 | |
1645 | /* perform per-dev EH action only on the offending device */ | |
4528e4da TH |
1646 | ehc->i.dev_action[ehc->i.dev->devno] |= |
1647 | ehc->i.action & ATA_EH_PERDEV_MASK; | |
1648 | ehc->i.action &= ~ATA_EH_PERDEV_MASK; | |
47005f25 TH |
1649 | } |
1650 | ||
022bdb07 TH |
1651 | DPRINTK("EXIT\n"); |
1652 | } | |
1653 | ||
1654 | /** | |
1655 | * ata_eh_report - report error handling to user | |
1656 | * @ap: ATA port EH is going on | |
1657 | * | |
1658 | * Report EH to user. | |
1659 | * | |
1660 | * LOCKING: | |
1661 | * None. | |
1662 | */ | |
1663 | static void ata_eh_report(struct ata_port *ap) | |
1664 | { | |
9af5c9c9 | 1665 | struct ata_eh_context *ehc = &ap->link.eh_context; |
022bdb07 TH |
1666 | const char *frozen, *desc; |
1667 | int tag, nr_failed = 0; | |
1668 | ||
1669 | desc = NULL; | |
1670 | if (ehc->i.desc[0] != '\0') | |
1671 | desc = ehc->i.desc; | |
1672 | ||
1673 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1674 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
1675 | ||
1676 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
1677 | continue; | |
1678 | if (qc->flags & ATA_QCFLAG_SENSE_VALID && !qc->err_mask) | |
1679 | continue; | |
1680 | ||
1681 | nr_failed++; | |
1682 | } | |
1683 | ||
1684 | if (!nr_failed && !ehc->i.err_mask) | |
1685 | return; | |
1686 | ||
1687 | frozen = ""; | |
b51e9e5d | 1688 | if (ap->pflags & ATA_PFLAG_FROZEN) |
022bdb07 TH |
1689 | frozen = " frozen"; |
1690 | ||
1691 | if (ehc->i.dev) { | |
e8ee8451 TH |
1692 | ata_dev_printk(ehc->i.dev, KERN_ERR, "exception Emask 0x%x " |
1693 | "SAct 0x%x SErr 0x%x action 0x%x%s\n", | |
9af5c9c9 TH |
1694 | ehc->i.err_mask, ap->link.sactive, |
1695 | ehc->i.serror, ehc->i.action, frozen); | |
022bdb07 | 1696 | if (desc) |
b64bbc39 | 1697 | ata_dev_printk(ehc->i.dev, KERN_ERR, "%s\n", desc); |
022bdb07 | 1698 | } else { |
e8ee8451 TH |
1699 | ata_port_printk(ap, KERN_ERR, "exception Emask 0x%x " |
1700 | "SAct 0x%x SErr 0x%x action 0x%x%s\n", | |
9af5c9c9 TH |
1701 | ehc->i.err_mask, ap->link.sactive, |
1702 | ehc->i.serror, ehc->i.action, frozen); | |
022bdb07 | 1703 | if (desc) |
b64bbc39 | 1704 | ata_port_printk(ap, KERN_ERR, "%s\n", desc); |
022bdb07 TH |
1705 | } |
1706 | ||
1707 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
8a937581 TH |
1708 | static const char *dma_str[] = { |
1709 | [DMA_BIDIRECTIONAL] = "bidi", | |
1710 | [DMA_TO_DEVICE] = "out", | |
1711 | [DMA_FROM_DEVICE] = "in", | |
1712 | [DMA_NONE] = "", | |
1713 | }; | |
022bdb07 | 1714 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); |
8a937581 | 1715 | struct ata_taskfile *cmd = &qc->tf, *res = &qc->result_tf; |
022bdb07 TH |
1716 | |
1717 | if (!(qc->flags & ATA_QCFLAG_FAILED) || !qc->err_mask) | |
1718 | continue; | |
1719 | ||
8a937581 TH |
1720 | ata_dev_printk(qc->dev, KERN_ERR, |
1721 | "cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x " | |
664e8503 | 1722 | "tag %d cdb 0x%x data %u %s\n " |
8a937581 | 1723 | "res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x " |
5335b729 | 1724 | "Emask 0x%x (%s)%s\n", |
8a937581 TH |
1725 | cmd->command, cmd->feature, cmd->nsect, |
1726 | cmd->lbal, cmd->lbam, cmd->lbah, | |
1727 | cmd->hob_feature, cmd->hob_nsect, | |
1728 | cmd->hob_lbal, cmd->hob_lbam, cmd->hob_lbah, | |
726f0785 | 1729 | cmd->device, qc->tag, qc->cdb[0], qc->nbytes, |
664e8503 | 1730 | dma_str[qc->dma_dir], |
8a937581 TH |
1731 | res->command, res->feature, res->nsect, |
1732 | res->lbal, res->lbam, res->lbah, | |
1733 | res->hob_feature, res->hob_nsect, | |
1734 | res->hob_lbal, res->hob_lbam, res->hob_lbah, | |
5335b729 TH |
1735 | res->device, qc->err_mask, ata_err_string(qc->err_mask), |
1736 | qc->err_mask & AC_ERR_NCQ ? " <F>" : ""); | |
022bdb07 TH |
1737 | } |
1738 | } | |
1739 | ||
d87fa38e | 1740 | static int ata_do_reset(struct ata_port *ap, ata_reset_fn_t reset, |
d4b2bab4 | 1741 | unsigned int *classes, unsigned long deadline) |
d87fa38e | 1742 | { |
f58229f8 TH |
1743 | struct ata_device *dev; |
1744 | int rc; | |
d87fa38e | 1745 | |
f58229f8 TH |
1746 | ata_link_for_each_dev(dev, &ap->link) |
1747 | classes[dev->devno] = ATA_DEV_UNKNOWN; | |
d87fa38e | 1748 | |
d4b2bab4 | 1749 | rc = reset(ap, classes, deadline); |
d87fa38e TH |
1750 | if (rc) |
1751 | return rc; | |
1752 | ||
1753 | /* If any class isn't ATA_DEV_UNKNOWN, consider classification | |
1754 | * is complete and convert all ATA_DEV_UNKNOWN to | |
1755 | * ATA_DEV_NONE. | |
1756 | */ | |
f58229f8 TH |
1757 | ata_link_for_each_dev(dev, &ap->link) |
1758 | if (classes[dev->devno] != ATA_DEV_UNKNOWN) | |
d87fa38e TH |
1759 | break; |
1760 | ||
f58229f8 TH |
1761 | if (dev) { |
1762 | ata_link_for_each_dev(dev, &ap->link) { | |
1763 | if (classes[dev->devno] == ATA_DEV_UNKNOWN) | |
1764 | classes[dev->devno] = ATA_DEV_NONE; | |
1765 | } | |
1766 | } | |
d87fa38e TH |
1767 | |
1768 | return 0; | |
1769 | } | |
1770 | ||
664faf09 TH |
1771 | static int ata_eh_followup_srst_needed(int rc, int classify, |
1772 | const unsigned int *classes) | |
1773 | { | |
1774 | if (rc == -EAGAIN) | |
1775 | return 1; | |
1776 | if (rc != 0) | |
1777 | return 0; | |
1778 | if (classify && classes[0] == ATA_DEV_UNKNOWN) | |
1779 | return 1; | |
1780 | return 0; | |
1781 | } | |
1782 | ||
1783 | static int ata_eh_reset(struct ata_port *ap, int classify, | |
f5914a46 | 1784 | ata_prereset_fn_t prereset, ata_reset_fn_t softreset, |
022bdb07 TH |
1785 | ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) |
1786 | { | |
936fd732 TH |
1787 | struct ata_link *link = &ap->link; |
1788 | struct ata_eh_context *ehc = &link->eh_context; | |
664faf09 | 1789 | unsigned int *classes = ehc->classes; |
1cdaf534 | 1790 | int verbose = !(ehc->i.flags & ATA_EHI_QUIET); |
31daabda | 1791 | int try = 0; |
f58229f8 | 1792 | struct ata_device *dev; |
31daabda | 1793 | unsigned long deadline; |
f5914a46 | 1794 | unsigned int action; |
022bdb07 | 1795 | ata_reset_fn_t reset; |
f58229f8 | 1796 | int rc; |
022bdb07 | 1797 | |
13abf50d | 1798 | /* about to reset */ |
955e57df | 1799 | ata_eh_about_to_do(link, NULL, ehc->i.action & ATA_EH_RESET_MASK); |
13abf50d | 1800 | |
f5914a46 TH |
1801 | /* Determine which reset to use and record in ehc->i.action. |
1802 | * prereset() may examine and modify it. | |
1803 | */ | |
1804 | action = ehc->i.action; | |
1805 | ehc->i.action &= ~ATA_EH_RESET_MASK; | |
936fd732 | 1806 | if (softreset && (!hardreset || (!sata_set_spd_needed(link) && |
f5914a46 TH |
1807 | !(action & ATA_EH_HARDRESET)))) |
1808 | ehc->i.action |= ATA_EH_SOFTRESET; | |
022bdb07 | 1809 | else |
f5914a46 TH |
1810 | ehc->i.action |= ATA_EH_HARDRESET; |
1811 | ||
1812 | if (prereset) { | |
31daabda | 1813 | rc = prereset(ap, jiffies + ATA_EH_PRERESET_TIMEOUT); |
f5914a46 | 1814 | if (rc) { |
c961922b | 1815 | if (rc == -ENOENT) { |
4aa9ab67 TH |
1816 | ata_port_printk(ap, KERN_DEBUG, |
1817 | "port disabled. ignoring.\n"); | |
9af5c9c9 | 1818 | ehc->i.action &= ~ATA_EH_RESET_MASK; |
4aa9ab67 | 1819 | |
936fd732 | 1820 | ata_link_for_each_dev(dev, link) |
f58229f8 | 1821 | classes[dev->devno] = ATA_DEV_NONE; |
4aa9ab67 TH |
1822 | |
1823 | rc = 0; | |
c961922b AC |
1824 | } else |
1825 | ata_port_printk(ap, KERN_ERR, | |
f5914a46 | 1826 | "prereset failed (errno=%d)\n", rc); |
fccb6ea5 | 1827 | goto out; |
f5914a46 TH |
1828 | } |
1829 | } | |
1830 | ||
1831 | /* prereset() might have modified ehc->i.action */ | |
1832 | if (ehc->i.action & ATA_EH_HARDRESET) | |
022bdb07 | 1833 | reset = hardreset; |
f5914a46 TH |
1834 | else if (ehc->i.action & ATA_EH_SOFTRESET) |
1835 | reset = softreset; | |
1836 | else { | |
1837 | /* prereset told us not to reset, bang classes and return */ | |
936fd732 | 1838 | ata_link_for_each_dev(dev, link) |
f58229f8 | 1839 | classes[dev->devno] = ATA_DEV_NONE; |
fccb6ea5 TH |
1840 | rc = 0; |
1841 | goto out; | |
f5914a46 TH |
1842 | } |
1843 | ||
1844 | /* did prereset() screw up? if so, fix up to avoid oopsing */ | |
1845 | if (!reset) { | |
f5914a46 TH |
1846 | if (softreset) |
1847 | reset = softreset; | |
1848 | else | |
1849 | reset = hardreset; | |
1850 | } | |
022bdb07 TH |
1851 | |
1852 | retry: | |
31daabda TH |
1853 | deadline = jiffies + ata_eh_reset_timeouts[try++]; |
1854 | ||
3e706399 TH |
1855 | /* shut up during boot probing */ |
1856 | if (verbose) | |
1857 | ata_port_printk(ap, KERN_INFO, "%s resetting port\n", | |
1858 | reset == softreset ? "soft" : "hard"); | |
022bdb07 | 1859 | |
13abf50d | 1860 | /* mark that this EH session started with reset */ |
0d64a233 TH |
1861 | if (reset == hardreset) |
1862 | ehc->i.flags |= ATA_EHI_DID_HARDRESET; | |
1863 | else | |
1864 | ehc->i.flags |= ATA_EHI_DID_SOFTRESET; | |
022bdb07 | 1865 | |
31daabda | 1866 | rc = ata_do_reset(ap, reset, classes, deadline); |
022bdb07 | 1867 | |
664faf09 TH |
1868 | if (reset == hardreset && |
1869 | ata_eh_followup_srst_needed(rc, classify, classes)) { | |
1870 | /* okay, let's do follow-up softreset */ | |
664faf09 TH |
1871 | reset = softreset; |
1872 | ||
1873 | if (!reset) { | |
1874 | ata_port_printk(ap, KERN_ERR, | |
1875 | "follow-up softreset required " | |
1876 | "but no softreset avaliable\n"); | |
fccb6ea5 TH |
1877 | rc = -EINVAL; |
1878 | goto out; | |
664faf09 TH |
1879 | } |
1880 | ||
955e57df | 1881 | ata_eh_about_to_do(link, NULL, ATA_EH_RESET_MASK); |
31daabda | 1882 | rc = ata_do_reset(ap, reset, classes, deadline); |
664faf09 TH |
1883 | |
1884 | if (rc == 0 && classify && | |
1885 | classes[0] == ATA_DEV_UNKNOWN) { | |
1886 | ata_port_printk(ap, KERN_ERR, | |
1887 | "classification failed\n"); | |
fccb6ea5 TH |
1888 | rc = -EINVAL; |
1889 | goto out; | |
664faf09 TH |
1890 | } |
1891 | } | |
1892 | ||
31daabda TH |
1893 | if (rc && try < ARRAY_SIZE(ata_eh_reset_timeouts)) { |
1894 | unsigned long now = jiffies; | |
664faf09 | 1895 | |
31daabda TH |
1896 | if (time_before(now, deadline)) { |
1897 | unsigned long delta = deadline - jiffies; | |
664faf09 | 1898 | |
31daabda TH |
1899 | ata_port_printk(ap, KERN_WARNING, "reset failed " |
1900 | "(errno=%d), retrying in %u secs\n", | |
1901 | rc, (jiffies_to_msecs(delta) + 999) / 1000); | |
1902 | ||
1903 | schedule_timeout_uninterruptible(delta); | |
1904 | } | |
022bdb07 | 1905 | |
f1545154 | 1906 | if (rc == -EPIPE || |
31daabda | 1907 | try == ARRAY_SIZE(ata_eh_reset_timeouts) - 1) |
936fd732 | 1908 | sata_down_spd_limit(link); |
022bdb07 TH |
1909 | if (hardreset) |
1910 | reset = hardreset; | |
1911 | goto retry; | |
1912 | } | |
1913 | ||
1914 | if (rc == 0) { | |
008a7896 TH |
1915 | u32 sstatus; |
1916 | ||
20952b69 TH |
1917 | /* After the reset, the device state is PIO 0 and the |
1918 | * controller state is undefined. Record the mode. | |
1919 | */ | |
936fd732 | 1920 | ata_link_for_each_dev(dev, link) |
f58229f8 | 1921 | dev->pio_mode = XFER_PIO_0; |
20952b69 | 1922 | |
008a7896 | 1923 | /* record current link speed */ |
936fd732 TH |
1924 | if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0) |
1925 | link->sata_spd = (sstatus >> 4) & 0xf; | |
008a7896 | 1926 | |
022bdb07 TH |
1927 | if (postreset) |
1928 | postreset(ap, classes); | |
1929 | ||
1930 | /* reset successful, schedule revalidation */ | |
955e57df | 1931 | ata_eh_done(link, NULL, ehc->i.action & ATA_EH_RESET_MASK); |
022bdb07 TH |
1932 | ehc->i.action |= ATA_EH_REVALIDATE; |
1933 | } | |
fccb6ea5 TH |
1934 | out: |
1935 | /* clear hotplug flag */ | |
1936 | ehc->i.flags &= ~ATA_EHI_HOTPLUGGED; | |
022bdb07 TH |
1937 | return rc; |
1938 | } | |
1939 | ||
084fe639 TH |
1940 | static int ata_eh_revalidate_and_attach(struct ata_port *ap, |
1941 | struct ata_device **r_failed_dev) | |
022bdb07 | 1942 | { |
9af5c9c9 | 1943 | struct ata_eh_context *ehc = &ap->link.eh_context; |
022bdb07 | 1944 | struct ata_device *dev; |
8c3c52a8 | 1945 | unsigned int new_mask = 0; |
084fe639 | 1946 | unsigned long flags; |
f58229f8 | 1947 | int rc = 0; |
022bdb07 TH |
1948 | |
1949 | DPRINTK("ENTER\n"); | |
1950 | ||
8c3c52a8 TH |
1951 | /* For PATA drive side cable detection to work, IDENTIFY must |
1952 | * be done backwards such that PDIAG- is released by the slave | |
1953 | * device before the master device is identified. | |
1954 | */ | |
f58229f8 TH |
1955 | ata_link_for_each_dev_reverse(dev, &ap->link) { |
1956 | unsigned int action = ata_eh_dev_action(dev); | |
1957 | unsigned int readid_flags = 0; | |
022bdb07 | 1958 | |
bff04647 TH |
1959 | if (ehc->i.flags & ATA_EHI_DID_RESET) |
1960 | readid_flags |= ATA_READID_POSTRESET; | |
1961 | ||
9666f400 | 1962 | if ((action & ATA_EH_REVALIDATE) && ata_dev_enabled(dev)) { |
936fd732 | 1963 | if (ata_link_offline(&ap->link)) { |
022bdb07 | 1964 | rc = -EIO; |
8c3c52a8 | 1965 | goto err; |
022bdb07 TH |
1966 | } |
1967 | ||
955e57df | 1968 | ata_eh_about_to_do(&ap->link, dev, ATA_EH_REVALIDATE); |
bff04647 | 1969 | rc = ata_dev_revalidate(dev, readid_flags); |
022bdb07 | 1970 | if (rc) |
8c3c52a8 | 1971 | goto err; |
022bdb07 | 1972 | |
955e57df | 1973 | ata_eh_done(&ap->link, dev, ATA_EH_REVALIDATE); |
47005f25 | 1974 | |
baa1e78a TH |
1975 | /* Configuration may have changed, reconfigure |
1976 | * transfer mode. | |
1977 | */ | |
1978 | ehc->i.flags |= ATA_EHI_SETMODE; | |
1979 | ||
3057ac3c | 1980 | /* schedule the scsi_rescan_device() here */ |
1981 | queue_work(ata_aux_wq, &(ap->scsi_rescan_task)); | |
084fe639 TH |
1982 | } else if (dev->class == ATA_DEV_UNKNOWN && |
1983 | ehc->tries[dev->devno] && | |
1984 | ata_class_enabled(ehc->classes[dev->devno])) { | |
1985 | dev->class = ehc->classes[dev->devno]; | |
1986 | ||
bff04647 TH |
1987 | rc = ata_dev_read_id(dev, &dev->class, readid_flags, |
1988 | dev->id); | |
8c3c52a8 TH |
1989 | switch (rc) { |
1990 | case 0: | |
f58229f8 | 1991 | new_mask |= 1 << dev->devno; |
8c3c52a8 TH |
1992 | break; |
1993 | case -ENOENT: | |
55a8e2c8 TH |
1994 | /* IDENTIFY was issued to non-existent |
1995 | * device. No need to reset. Just | |
1996 | * thaw and kill the device. | |
1997 | */ | |
1998 | ata_eh_thaw_port(ap); | |
084fe639 TH |
1999 | dev->class = ATA_DEV_UNKNOWN; |
2000 | break; | |
8c3c52a8 TH |
2001 | default: |
2002 | dev->class = ATA_DEV_UNKNOWN; | |
2003 | goto err; | |
084fe639 | 2004 | } |
8c3c52a8 TH |
2005 | } |
2006 | } | |
084fe639 | 2007 | |
c1c4e8d5 TH |
2008 | /* PDIAG- should have been released, ask cable type if post-reset */ |
2009 | if ((ehc->i.flags & ATA_EHI_DID_RESET) && ap->ops->cable_detect) | |
2010 | ap->cbl = ap->ops->cable_detect(ap); | |
2011 | ||
8c3c52a8 TH |
2012 | /* Configure new devices forward such that user doesn't see |
2013 | * device detection messages backwards. | |
2014 | */ | |
f58229f8 TH |
2015 | ata_link_for_each_dev(dev, &ap->link) { |
2016 | if (!(new_mask & (1 << dev->devno))) | |
8c3c52a8 TH |
2017 | continue; |
2018 | ||
2019 | ehc->i.flags |= ATA_EHI_PRINTINFO; | |
2020 | rc = ata_dev_configure(dev); | |
2021 | ehc->i.flags &= ~ATA_EHI_PRINTINFO; | |
2022 | if (rc) | |
2023 | goto err; | |
2024 | ||
2025 | spin_lock_irqsave(ap->lock, flags); | |
2026 | ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG; | |
2027 | spin_unlock_irqrestore(ap->lock, flags); | |
2028 | ||
2029 | /* new device discovered, configure xfermode */ | |
2030 | ehc->i.flags |= ATA_EHI_SETMODE; | |
022bdb07 TH |
2031 | } |
2032 | ||
8c3c52a8 | 2033 | return 0; |
022bdb07 | 2034 | |
8c3c52a8 TH |
2035 | err: |
2036 | *r_failed_dev = dev; | |
2037 | DPRINTK("EXIT rc=%d\n", rc); | |
022bdb07 TH |
2038 | return rc; |
2039 | } | |
2040 | ||
2041 | static int ata_port_nr_enabled(struct ata_port *ap) | |
2042 | { | |
f58229f8 TH |
2043 | struct ata_device *dev; |
2044 | int cnt = 0; | |
022bdb07 | 2045 | |
f58229f8 TH |
2046 | ata_link_for_each_dev(dev, &ap->link) |
2047 | if (ata_dev_enabled(dev)) | |
022bdb07 TH |
2048 | cnt++; |
2049 | return cnt; | |
2050 | } | |
2051 | ||
084fe639 TH |
2052 | static int ata_port_nr_vacant(struct ata_port *ap) |
2053 | { | |
f58229f8 TH |
2054 | struct ata_device *dev; |
2055 | int cnt = 0; | |
084fe639 | 2056 | |
f58229f8 TH |
2057 | ata_link_for_each_dev(dev, &ap->link) |
2058 | if (dev->class == ATA_DEV_UNKNOWN) | |
084fe639 TH |
2059 | cnt++; |
2060 | return cnt; | |
2061 | } | |
2062 | ||
2063 | static int ata_eh_skip_recovery(struct ata_port *ap) | |
2064 | { | |
9af5c9c9 | 2065 | struct ata_eh_context *ehc = &ap->link.eh_context; |
f58229f8 | 2066 | struct ata_device *dev; |
084fe639 | 2067 | |
7c8c2cff TH |
2068 | /* thaw frozen port, resume link and recover failed devices */ |
2069 | if ((ap->pflags & ATA_PFLAG_FROZEN) || | |
2070 | (ehc->i.flags & ATA_EHI_RESUME_LINK) || ata_port_nr_enabled(ap)) | |
084fe639 TH |
2071 | return 0; |
2072 | ||
2073 | /* skip if class codes for all vacant slots are ATA_DEV_NONE */ | |
f58229f8 | 2074 | ata_link_for_each_dev(dev, &ap->link) { |
084fe639 TH |
2075 | if (dev->class == ATA_DEV_UNKNOWN && |
2076 | ehc->classes[dev->devno] != ATA_DEV_NONE) | |
2077 | return 0; | |
2078 | } | |
2079 | ||
2080 | return 1; | |
2081 | } | |
2082 | ||
fee7ca72 TH |
2083 | static void ata_eh_handle_dev_fail(struct ata_device *dev, int err) |
2084 | { | |
9af5c9c9 | 2085 | struct ata_eh_context *ehc = &dev->link->eh_context; |
fee7ca72 TH |
2086 | |
2087 | ehc->tries[dev->devno]--; | |
2088 | ||
2089 | switch (err) { | |
2090 | case -ENODEV: | |
2091 | /* device missing or wrong IDENTIFY data, schedule probing */ | |
2092 | ehc->i.probe_mask |= (1 << dev->devno); | |
2093 | case -EINVAL: | |
2094 | /* give it just one more chance */ | |
2095 | ehc->tries[dev->devno] = min(ehc->tries[dev->devno], 1); | |
2096 | case -EIO: | |
2097 | if (ehc->tries[dev->devno] == 1) { | |
2098 | /* This is the last chance, better to slow | |
2099 | * down than lose it. | |
2100 | */ | |
936fd732 | 2101 | sata_down_spd_limit(dev->link); |
fee7ca72 TH |
2102 | ata_down_xfermask_limit(dev, ATA_DNXFER_PIO); |
2103 | } | |
2104 | } | |
2105 | ||
2106 | if (ata_dev_enabled(dev) && !ehc->tries[dev->devno]) { | |
2107 | /* disable device if it has used up all its chances */ | |
2108 | ata_dev_disable(dev); | |
2109 | ||
2110 | /* detach if offline */ | |
936fd732 | 2111 | if (ata_link_offline(dev->link)) |
fee7ca72 TH |
2112 | ata_eh_detach_dev(dev); |
2113 | ||
2114 | /* probe if requested */ | |
2115 | if ((ehc->i.probe_mask & (1 << dev->devno)) && | |
2116 | !(ehc->did_probe_mask & (1 << dev->devno))) { | |
2117 | ata_eh_detach_dev(dev); | |
2118 | ata_dev_init(dev); | |
2119 | ||
2120 | ehc->tries[dev->devno] = ATA_EH_DEV_TRIES; | |
2121 | ehc->did_probe_mask |= (1 << dev->devno); | |
2122 | ehc->i.action |= ATA_EH_SOFTRESET; | |
2123 | } | |
2124 | } else { | |
2125 | /* soft didn't work? be haaaaard */ | |
2126 | if (ehc->i.flags & ATA_EHI_DID_RESET) | |
2127 | ehc->i.action |= ATA_EH_HARDRESET; | |
2128 | else | |
2129 | ehc->i.action |= ATA_EH_SOFTRESET; | |
2130 | } | |
2131 | } | |
2132 | ||
022bdb07 TH |
2133 | /** |
2134 | * ata_eh_recover - recover host port after error | |
2135 | * @ap: host port to recover | |
f5914a46 | 2136 | * @prereset: prereset method (can be NULL) |
022bdb07 TH |
2137 | * @softreset: softreset method (can be NULL) |
2138 | * @hardreset: hardreset method (can be NULL) | |
2139 | * @postreset: postreset method (can be NULL) | |
2140 | * | |
2141 | * This is the alpha and omega, eum and yang, heart and soul of | |
2142 | * libata exception handling. On entry, actions required to | |
084fe639 TH |
2143 | * recover the port and hotplug requests are recorded in |
2144 | * eh_context. This function executes all the operations with | |
2145 | * appropriate retrials and fallbacks to resurrect failed | |
2146 | * devices, detach goners and greet newcomers. | |
022bdb07 TH |
2147 | * |
2148 | * LOCKING: | |
2149 | * Kernel thread context (may sleep). | |
2150 | * | |
2151 | * RETURNS: | |
2152 | * 0 on success, -errno on failure. | |
2153 | */ | |
f5914a46 TH |
2154 | static int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset, |
2155 | ata_reset_fn_t softreset, ata_reset_fn_t hardreset, | |
022bdb07 TH |
2156 | ata_postreset_fn_t postreset) |
2157 | { | |
9af5c9c9 | 2158 | struct ata_eh_context *ehc = &ap->link.eh_context; |
022bdb07 | 2159 | struct ata_device *dev; |
f58229f8 | 2160 | int rc; |
022bdb07 TH |
2161 | |
2162 | DPRINTK("ENTER\n"); | |
2163 | ||
2164 | /* prep for recovery */ | |
f58229f8 | 2165 | ata_link_for_each_dev(dev, &ap->link) { |
022bdb07 | 2166 | ehc->tries[dev->devno] = ATA_EH_DEV_TRIES; |
084fe639 | 2167 | |
79a55b72 | 2168 | /* collect port action mask recorded in dev actions */ |
f58229f8 TH |
2169 | ehc->i.action |= |
2170 | ehc->i.dev_action[dev->devno] & ~ATA_EH_PERDEV_MASK; | |
2171 | ehc->i.dev_action[dev->devno] &= ATA_EH_PERDEV_MASK; | |
79a55b72 | 2172 | |
084fe639 TH |
2173 | /* process hotplug request */ |
2174 | if (dev->flags & ATA_DFLAG_DETACH) | |
2175 | ata_eh_detach_dev(dev); | |
2176 | ||
2177 | if (!ata_dev_enabled(dev) && | |
2178 | ((ehc->i.probe_mask & (1 << dev->devno)) && | |
2179 | !(ehc->did_probe_mask & (1 << dev->devno)))) { | |
2180 | ata_eh_detach_dev(dev); | |
2181 | ata_dev_init(dev); | |
2182 | ehc->did_probe_mask |= (1 << dev->devno); | |
2183 | ehc->i.action |= ATA_EH_SOFTRESET; | |
2184 | } | |
022bdb07 TH |
2185 | } |
2186 | ||
2187 | retry: | |
022bdb07 TH |
2188 | rc = 0; |
2189 | ||
aeb2ecd6 | 2190 | /* if UNLOADING, finish immediately */ |
b51e9e5d | 2191 | if (ap->pflags & ATA_PFLAG_UNLOADING) |
aeb2ecd6 TH |
2192 | goto out; |
2193 | ||
022bdb07 | 2194 | /* skip EH if possible. */ |
084fe639 | 2195 | if (ata_eh_skip_recovery(ap)) |
022bdb07 TH |
2196 | ehc->i.action = 0; |
2197 | ||
f58229f8 TH |
2198 | ata_link_for_each_dev(dev, &ap->link) |
2199 | ehc->classes[dev->devno] = ATA_DEV_UNKNOWN; | |
084fe639 | 2200 | |
022bdb07 TH |
2201 | /* reset */ |
2202 | if (ehc->i.action & ATA_EH_RESET_MASK) { | |
2203 | ata_eh_freeze_port(ap); | |
2204 | ||
084fe639 TH |
2205 | rc = ata_eh_reset(ap, ata_port_nr_vacant(ap), prereset, |
2206 | softreset, hardreset, postreset); | |
022bdb07 TH |
2207 | if (rc) { |
2208 | ata_port_printk(ap, KERN_ERR, | |
2209 | "reset failed, giving up\n"); | |
2210 | goto out; | |
2211 | } | |
2212 | ||
2213 | ata_eh_thaw_port(ap); | |
2214 | } | |
2215 | ||
084fe639 TH |
2216 | /* revalidate existing devices and attach new ones */ |
2217 | rc = ata_eh_revalidate_and_attach(ap, &dev); | |
022bdb07 TH |
2218 | if (rc) |
2219 | goto dev_fail; | |
2220 | ||
baa1e78a TH |
2221 | /* configure transfer mode if necessary */ |
2222 | if (ehc->i.flags & ATA_EHI_SETMODE) { | |
022bdb07 | 2223 | rc = ata_set_mode(ap, &dev); |
4ae72a1e | 2224 | if (rc) |
022bdb07 | 2225 | goto dev_fail; |
baa1e78a | 2226 | ehc->i.flags &= ~ATA_EHI_SETMODE; |
022bdb07 TH |
2227 | } |
2228 | ||
2229 | goto out; | |
2230 | ||
2231 | dev_fail: | |
fee7ca72 | 2232 | ata_eh_handle_dev_fail(dev, rc); |
022bdb07 TH |
2233 | |
2234 | if (ata_port_nr_enabled(ap)) { | |
2235 | ata_port_printk(ap, KERN_WARNING, "failed to recover some " | |
2236 | "devices, retrying in 5 secs\n"); | |
2237 | ssleep(5); | |
2238 | } else { | |
2239 | /* no device left, repeat fast */ | |
2240 | msleep(500); | |
2241 | } | |
2242 | ||
2243 | goto retry; | |
2244 | ||
2245 | out: | |
2246 | if (rc) { | |
f58229f8 TH |
2247 | ata_link_for_each_dev(dev, &ap->link); |
2248 | ata_dev_disable(dev); | |
022bdb07 TH |
2249 | } |
2250 | ||
2251 | DPRINTK("EXIT, rc=%d\n", rc); | |
2252 | return rc; | |
2253 | } | |
2254 | ||
2255 | /** | |
2256 | * ata_eh_finish - finish up EH | |
2257 | * @ap: host port to finish EH for | |
2258 | * | |
2259 | * Recovery is complete. Clean up EH states and retry or finish | |
2260 | * failed qcs. | |
2261 | * | |
2262 | * LOCKING: | |
2263 | * None. | |
2264 | */ | |
2265 | static void ata_eh_finish(struct ata_port *ap) | |
2266 | { | |
2267 | int tag; | |
2268 | ||
2269 | /* retry or finish qcs */ | |
2270 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
2271 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
2272 | ||
2273 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
2274 | continue; | |
2275 | ||
2276 | if (qc->err_mask) { | |
2277 | /* FIXME: Once EH migration is complete, | |
2278 | * generate sense data in this function, | |
2279 | * considering both err_mask and tf. | |
2280 | */ | |
2281 | if (qc->err_mask & AC_ERR_INVALID) | |
2282 | ata_eh_qc_complete(qc); | |
2283 | else | |
2284 | ata_eh_qc_retry(qc); | |
2285 | } else { | |
2286 | if (qc->flags & ATA_QCFLAG_SENSE_VALID) { | |
2287 | ata_eh_qc_complete(qc); | |
2288 | } else { | |
2289 | /* feed zero TF to sense generation */ | |
2290 | memset(&qc->result_tf, 0, sizeof(qc->result_tf)); | |
2291 | ata_eh_qc_retry(qc); | |
2292 | } | |
2293 | } | |
2294 | } | |
2295 | } | |
2296 | ||
2297 | /** | |
2298 | * ata_do_eh - do standard error handling | |
2299 | * @ap: host port to handle error for | |
f5914a46 | 2300 | * @prereset: prereset method (can be NULL) |
022bdb07 TH |
2301 | * @softreset: softreset method (can be NULL) |
2302 | * @hardreset: hardreset method (can be NULL) | |
2303 | * @postreset: postreset method (can be NULL) | |
2304 | * | |
2305 | * Perform standard error handling sequence. | |
2306 | * | |
2307 | * LOCKING: | |
2308 | * Kernel thread context (may sleep). | |
2309 | */ | |
f5914a46 TH |
2310 | void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset, |
2311 | ata_reset_fn_t softreset, ata_reset_fn_t hardreset, | |
2312 | ata_postreset_fn_t postreset) | |
022bdb07 | 2313 | { |
1cdaf534 TH |
2314 | ata_eh_autopsy(ap); |
2315 | ata_eh_report(ap); | |
f5914a46 | 2316 | ata_eh_recover(ap, prereset, softreset, hardreset, postreset); |
022bdb07 TH |
2317 | ata_eh_finish(ap); |
2318 | } | |
500530f6 | 2319 | |
6ffa01d8 | 2320 | #ifdef CONFIG_PM |
500530f6 TH |
2321 | /** |
2322 | * ata_eh_handle_port_suspend - perform port suspend operation | |
2323 | * @ap: port to suspend | |
2324 | * | |
2325 | * Suspend @ap. | |
2326 | * | |
2327 | * LOCKING: | |
2328 | * Kernel thread context (may sleep). | |
2329 | */ | |
2330 | static void ata_eh_handle_port_suspend(struct ata_port *ap) | |
2331 | { | |
2332 | unsigned long flags; | |
2333 | int rc = 0; | |
2334 | ||
2335 | /* are we suspending? */ | |
2336 | spin_lock_irqsave(ap->lock, flags); | |
2337 | if (!(ap->pflags & ATA_PFLAG_PM_PENDING) || | |
2338 | ap->pm_mesg.event == PM_EVENT_ON) { | |
2339 | spin_unlock_irqrestore(ap->lock, flags); | |
2340 | return; | |
2341 | } | |
2342 | spin_unlock_irqrestore(ap->lock, flags); | |
2343 | ||
2344 | WARN_ON(ap->pflags & ATA_PFLAG_SUSPENDED); | |
2345 | ||
64578a3d TH |
2346 | /* tell ACPI we're suspending */ |
2347 | rc = ata_acpi_on_suspend(ap); | |
2348 | if (rc) | |
2349 | goto out; | |
2350 | ||
500530f6 TH |
2351 | /* suspend */ |
2352 | ata_eh_freeze_port(ap); | |
2353 | ||
2354 | if (ap->ops->port_suspend) | |
2355 | rc = ap->ops->port_suspend(ap, ap->pm_mesg); | |
2356 | ||
64578a3d | 2357 | out: |
500530f6 TH |
2358 | /* report result */ |
2359 | spin_lock_irqsave(ap->lock, flags); | |
2360 | ||
2361 | ap->pflags &= ~ATA_PFLAG_PM_PENDING; | |
2362 | if (rc == 0) | |
2363 | ap->pflags |= ATA_PFLAG_SUSPENDED; | |
64578a3d | 2364 | else if (ap->pflags & ATA_PFLAG_FROZEN) |
500530f6 TH |
2365 | ata_port_schedule_eh(ap); |
2366 | ||
2367 | if (ap->pm_result) { | |
2368 | *ap->pm_result = rc; | |
2369 | ap->pm_result = NULL; | |
2370 | } | |
2371 | ||
2372 | spin_unlock_irqrestore(ap->lock, flags); | |
2373 | ||
2374 | return; | |
2375 | } | |
2376 | ||
2377 | /** | |
2378 | * ata_eh_handle_port_resume - perform port resume operation | |
2379 | * @ap: port to resume | |
2380 | * | |
2381 | * Resume @ap. | |
2382 | * | |
500530f6 TH |
2383 | * LOCKING: |
2384 | * Kernel thread context (may sleep). | |
2385 | */ | |
2386 | static void ata_eh_handle_port_resume(struct ata_port *ap) | |
2387 | { | |
500530f6 | 2388 | unsigned long flags; |
9666f400 | 2389 | int rc = 0; |
500530f6 TH |
2390 | |
2391 | /* are we resuming? */ | |
2392 | spin_lock_irqsave(ap->lock, flags); | |
2393 | if (!(ap->pflags & ATA_PFLAG_PM_PENDING) || | |
2394 | ap->pm_mesg.event != PM_EVENT_ON) { | |
2395 | spin_unlock_irqrestore(ap->lock, flags); | |
2396 | return; | |
2397 | } | |
2398 | spin_unlock_irqrestore(ap->lock, flags); | |
2399 | ||
9666f400 | 2400 | WARN_ON(!(ap->pflags & ATA_PFLAG_SUSPENDED)); |
500530f6 TH |
2401 | |
2402 | if (ap->ops->port_resume) | |
2403 | rc = ap->ops->port_resume(ap); | |
2404 | ||
6746544c TH |
2405 | /* tell ACPI that we're resuming */ |
2406 | ata_acpi_on_resume(ap); | |
2407 | ||
9666f400 | 2408 | /* report result */ |
500530f6 TH |
2409 | spin_lock_irqsave(ap->lock, flags); |
2410 | ap->pflags &= ~(ATA_PFLAG_PM_PENDING | ATA_PFLAG_SUSPENDED); | |
2411 | if (ap->pm_result) { | |
2412 | *ap->pm_result = rc; | |
2413 | ap->pm_result = NULL; | |
2414 | } | |
2415 | spin_unlock_irqrestore(ap->lock, flags); | |
2416 | } | |
6ffa01d8 | 2417 | #endif /* CONFIG_PM */ |