Commit | Line | Data |
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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 | 35 | #include <linux/kernel.h> |
2855568b | 36 | #include <linux/pci.h> |
ece1d636 TH |
37 | #include <scsi/scsi.h> |
38 | #include <scsi/scsi_host.h> | |
39 | #include <scsi/scsi_eh.h> | |
40 | #include <scsi/scsi_device.h> | |
41 | #include <scsi/scsi_cmnd.h> | |
c6fd2807 | 42 | #include "../scsi/scsi_transport_api.h" |
ece1d636 TH |
43 | |
44 | #include <linux/libata.h> | |
45 | ||
46 | #include "libata.h" | |
47 | ||
7d47e8d4 TH |
48 | enum { |
49 | ATA_EH_SPDN_NCQ_OFF = (1 << 0), | |
50 | ATA_EH_SPDN_SPEED_DOWN = (1 << 1), | |
51 | ATA_EH_SPDN_FALLBACK_TO_PIO = (1 << 2), | |
52 | }; | |
53 | ||
31daabda TH |
54 | /* Waiting in ->prereset can never be reliable. It's sometimes nice |
55 | * to wait there but it can't be depended upon; otherwise, we wouldn't | |
56 | * be resetting. Just give it enough time for most drives to spin up. | |
57 | */ | |
58 | enum { | |
59 | ATA_EH_PRERESET_TIMEOUT = 10 * HZ, | |
5ddf24c5 | 60 | ATA_EH_FASTDRAIN_INTERVAL = 3 * HZ, |
31daabda TH |
61 | }; |
62 | ||
63 | /* The following table determines how we sequence resets. Each entry | |
64 | * represents timeout for that try. The first try can be soft or | |
65 | * hardreset. All others are hardreset if available. In most cases | |
66 | * the first reset w/ 10sec timeout should succeed. Following entries | |
67 | * are mostly for error handling, hotplug and retarded devices. | |
68 | */ | |
69 | static const unsigned long ata_eh_reset_timeouts[] = { | |
70 | 10 * HZ, /* most drives spin up by 10sec */ | |
71 | 10 * HZ, /* > 99% working drives spin up before 20sec */ | |
72 | 35 * HZ, /* give > 30 secs of idleness for retarded devices */ | |
73 | 5 * HZ, /* and sweet one last chance */ | |
74 | /* > 1 min has elapsed, give up */ | |
75 | }; | |
76 | ||
ad9e2762 | 77 | static void __ata_port_freeze(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 | ||
cbcdd875 TH |
154 | /** |
155 | * ata_port_desc - append port description | |
156 | * @ap: target ATA port | |
157 | * @fmt: printf format string | |
158 | * | |
159 | * Format string according to @fmt and append it to port | |
160 | * description. If port description is not empty, " " is added | |
161 | * in-between. This function is to be used while initializing | |
162 | * ata_host. The description is printed on host registration. | |
163 | * | |
164 | * LOCKING: | |
165 | * None. | |
166 | */ | |
167 | void ata_port_desc(struct ata_port *ap, const char *fmt, ...) | |
168 | { | |
169 | va_list args; | |
170 | ||
171 | WARN_ON(!(ap->pflags & ATA_PFLAG_INITIALIZING)); | |
172 | ||
173 | if (ap->link.eh_info.desc_len) | |
174 | __ata_ehi_push_desc(&ap->link.eh_info, " "); | |
175 | ||
176 | va_start(args, fmt); | |
177 | __ata_ehi_pushv_desc(&ap->link.eh_info, fmt, args); | |
178 | va_end(args); | |
179 | } | |
180 | ||
181 | #ifdef CONFIG_PCI | |
182 | ||
183 | /** | |
184 | * ata_port_pbar_desc - append PCI BAR description | |
185 | * @ap: target ATA port | |
186 | * @bar: target PCI BAR | |
187 | * @offset: offset into PCI BAR | |
188 | * @name: name of the area | |
189 | * | |
190 | * If @offset is negative, this function formats a string which | |
191 | * contains the name, address, size and type of the BAR and | |
192 | * appends it to the port description. If @offset is zero or | |
193 | * positive, only name and offsetted address is appended. | |
194 | * | |
195 | * LOCKING: | |
196 | * None. | |
197 | */ | |
198 | void ata_port_pbar_desc(struct ata_port *ap, int bar, ssize_t offset, | |
199 | const char *name) | |
200 | { | |
201 | struct pci_dev *pdev = to_pci_dev(ap->host->dev); | |
202 | char *type = ""; | |
203 | unsigned long long start, len; | |
204 | ||
205 | if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM) | |
206 | type = "m"; | |
207 | else if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) | |
208 | type = "i"; | |
209 | ||
210 | start = (unsigned long long)pci_resource_start(pdev, bar); | |
211 | len = (unsigned long long)pci_resource_len(pdev, bar); | |
212 | ||
213 | if (offset < 0) | |
214 | ata_port_desc(ap, "%s %s%llu@0x%llx", name, type, len, start); | |
215 | else | |
216 | ata_port_desc(ap, "%s 0x%llx", name, start + offset); | |
217 | } | |
218 | ||
219 | #endif /* CONFIG_PCI */ | |
220 | ||
0c247c55 TH |
221 | static void ata_ering_record(struct ata_ering *ering, int is_io, |
222 | unsigned int err_mask) | |
223 | { | |
224 | struct ata_ering_entry *ent; | |
225 | ||
226 | WARN_ON(!err_mask); | |
227 | ||
228 | ering->cursor++; | |
229 | ering->cursor %= ATA_ERING_SIZE; | |
230 | ||
231 | ent = &ering->ring[ering->cursor]; | |
232 | ent->is_io = is_io; | |
233 | ent->err_mask = err_mask; | |
234 | ent->timestamp = get_jiffies_64(); | |
235 | } | |
236 | ||
7d47e8d4 | 237 | static void ata_ering_clear(struct ata_ering *ering) |
0c247c55 | 238 | { |
7d47e8d4 | 239 | memset(ering, 0, sizeof(*ering)); |
0c247c55 TH |
240 | } |
241 | ||
242 | static int ata_ering_map(struct ata_ering *ering, | |
243 | int (*map_fn)(struct ata_ering_entry *, void *), | |
244 | void *arg) | |
245 | { | |
246 | int idx, rc = 0; | |
247 | struct ata_ering_entry *ent; | |
248 | ||
249 | idx = ering->cursor; | |
250 | do { | |
251 | ent = &ering->ring[idx]; | |
252 | if (!ent->err_mask) | |
253 | break; | |
254 | rc = map_fn(ent, arg); | |
255 | if (rc) | |
256 | break; | |
257 | idx = (idx - 1 + ATA_ERING_SIZE) % ATA_ERING_SIZE; | |
258 | } while (idx != ering->cursor); | |
259 | ||
260 | return rc; | |
261 | } | |
262 | ||
64f65ca6 TH |
263 | static unsigned int ata_eh_dev_action(struct ata_device *dev) |
264 | { | |
9af5c9c9 | 265 | struct ata_eh_context *ehc = &dev->link->eh_context; |
64f65ca6 TH |
266 | |
267 | return ehc->i.action | ehc->i.dev_action[dev->devno]; | |
268 | } | |
269 | ||
f58229f8 | 270 | static void ata_eh_clear_action(struct ata_link *link, struct ata_device *dev, |
af181c2d TH |
271 | struct ata_eh_info *ehi, unsigned int action) |
272 | { | |
f58229f8 | 273 | struct ata_device *tdev; |
af181c2d TH |
274 | |
275 | if (!dev) { | |
276 | ehi->action &= ~action; | |
f58229f8 TH |
277 | ata_link_for_each_dev(tdev, link) |
278 | ehi->dev_action[tdev->devno] &= ~action; | |
af181c2d TH |
279 | } else { |
280 | /* doesn't make sense for port-wide EH actions */ | |
281 | WARN_ON(!(action & ATA_EH_PERDEV_MASK)); | |
282 | ||
283 | /* break ehi->action into ehi->dev_action */ | |
284 | if (ehi->action & action) { | |
f58229f8 TH |
285 | ata_link_for_each_dev(tdev, link) |
286 | ehi->dev_action[tdev->devno] |= | |
287 | ehi->action & action; | |
af181c2d TH |
288 | ehi->action &= ~action; |
289 | } | |
290 | ||
291 | /* turn off the specified per-dev action */ | |
292 | ehi->dev_action[dev->devno] &= ~action; | |
293 | } | |
294 | } | |
295 | ||
ece1d636 TH |
296 | /** |
297 | * ata_scsi_timed_out - SCSI layer time out callback | |
298 | * @cmd: timed out SCSI command | |
299 | * | |
300 | * Handles SCSI layer timeout. We race with normal completion of | |
301 | * the qc for @cmd. If the qc is already gone, we lose and let | |
302 | * the scsi command finish (EH_HANDLED). Otherwise, the qc has | |
303 | * timed out and EH should be invoked. Prevent ata_qc_complete() | |
304 | * from finishing it by setting EH_SCHEDULED and return | |
305 | * EH_NOT_HANDLED. | |
306 | * | |
ad9e2762 TH |
307 | * TODO: kill this function once old EH is gone. |
308 | * | |
ece1d636 TH |
309 | * LOCKING: |
310 | * Called from timer context | |
311 | * | |
312 | * RETURNS: | |
313 | * EH_HANDLED or EH_NOT_HANDLED | |
314 | */ | |
315 | enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd) | |
316 | { | |
317 | struct Scsi_Host *host = cmd->device->host; | |
35bb94b1 | 318 | struct ata_port *ap = ata_shost_to_port(host); |
ece1d636 TH |
319 | unsigned long flags; |
320 | struct ata_queued_cmd *qc; | |
ad9e2762 | 321 | enum scsi_eh_timer_return ret; |
ece1d636 TH |
322 | |
323 | DPRINTK("ENTER\n"); | |
324 | ||
ad9e2762 TH |
325 | if (ap->ops->error_handler) { |
326 | ret = EH_NOT_HANDLED; | |
327 | goto out; | |
328 | } | |
329 | ||
330 | ret = EH_HANDLED; | |
ba6a1308 | 331 | spin_lock_irqsave(ap->lock, flags); |
9af5c9c9 | 332 | qc = ata_qc_from_tag(ap, ap->link.active_tag); |
ece1d636 TH |
333 | if (qc) { |
334 | WARN_ON(qc->scsicmd != cmd); | |
335 | qc->flags |= ATA_QCFLAG_EH_SCHEDULED; | |
336 | qc->err_mask |= AC_ERR_TIMEOUT; | |
337 | ret = EH_NOT_HANDLED; | |
338 | } | |
ba6a1308 | 339 | spin_unlock_irqrestore(ap->lock, flags); |
ece1d636 | 340 | |
ad9e2762 | 341 | out: |
ece1d636 TH |
342 | DPRINTK("EXIT, ret=%d\n", ret); |
343 | return ret; | |
344 | } | |
345 | ||
346 | /** | |
347 | * ata_scsi_error - SCSI layer error handler callback | |
348 | * @host: SCSI host on which error occurred | |
349 | * | |
350 | * Handles SCSI-layer-thrown error events. | |
351 | * | |
352 | * LOCKING: | |
353 | * Inherited from SCSI layer (none, can sleep) | |
354 | * | |
355 | * RETURNS: | |
356 | * Zero. | |
357 | */ | |
381544bb | 358 | void ata_scsi_error(struct Scsi_Host *host) |
ece1d636 | 359 | { |
35bb94b1 | 360 | struct ata_port *ap = ata_shost_to_port(host); |
a1e10f7e | 361 | int i; |
ad9e2762 | 362 | unsigned long flags; |
ece1d636 TH |
363 | |
364 | DPRINTK("ENTER\n"); | |
365 | ||
ad9e2762 | 366 | /* synchronize with port task */ |
ece1d636 TH |
367 | ata_port_flush_task(ap); |
368 | ||
cca3974e | 369 | /* synchronize with host lock and sort out timeouts */ |
ad9e2762 TH |
370 | |
371 | /* For new EH, all qcs are finished in one of three ways - | |
372 | * normal completion, error completion, and SCSI timeout. | |
373 | * Both cmpletions can race against SCSI timeout. When normal | |
374 | * completion wins, the qc never reaches EH. When error | |
375 | * completion wins, the qc has ATA_QCFLAG_FAILED set. | |
376 | * | |
377 | * When SCSI timeout wins, things are a bit more complex. | |
378 | * Normal or error completion can occur after the timeout but | |
379 | * before this point. In such cases, both types of | |
380 | * completions are honored. A scmd is determined to have | |
381 | * timed out iff its associated qc is active and not failed. | |
382 | */ | |
383 | if (ap->ops->error_handler) { | |
384 | struct scsi_cmnd *scmd, *tmp; | |
385 | int nr_timedout = 0; | |
386 | ||
e30349d2 | 387 | spin_lock_irqsave(ap->lock, flags); |
ad9e2762 TH |
388 | |
389 | list_for_each_entry_safe(scmd, tmp, &host->eh_cmd_q, eh_entry) { | |
390 | struct ata_queued_cmd *qc; | |
391 | ||
392 | for (i = 0; i < ATA_MAX_QUEUE; i++) { | |
393 | qc = __ata_qc_from_tag(ap, i); | |
394 | if (qc->flags & ATA_QCFLAG_ACTIVE && | |
395 | qc->scsicmd == scmd) | |
396 | break; | |
397 | } | |
398 | ||
399 | if (i < ATA_MAX_QUEUE) { | |
400 | /* the scmd has an associated qc */ | |
401 | if (!(qc->flags & ATA_QCFLAG_FAILED)) { | |
402 | /* which hasn't failed yet, timeout */ | |
403 | qc->err_mask |= AC_ERR_TIMEOUT; | |
404 | qc->flags |= ATA_QCFLAG_FAILED; | |
405 | nr_timedout++; | |
406 | } | |
407 | } else { | |
408 | /* Normal completion occurred after | |
409 | * SCSI timeout but before this point. | |
410 | * Successfully complete it. | |
411 | */ | |
412 | scmd->retries = scmd->allowed; | |
413 | scsi_eh_finish_cmd(scmd, &ap->eh_done_q); | |
414 | } | |
415 | } | |
416 | ||
417 | /* If we have timed out qcs. They belong to EH from | |
418 | * this point but the state of the controller is | |
419 | * unknown. Freeze the port to make sure the IRQ | |
420 | * handler doesn't diddle with those qcs. This must | |
421 | * be done atomically w.r.t. setting QCFLAG_FAILED. | |
422 | */ | |
423 | if (nr_timedout) | |
424 | __ata_port_freeze(ap); | |
425 | ||
e30349d2 | 426 | spin_unlock_irqrestore(ap->lock, flags); |
a1e10f7e TH |
427 | |
428 | /* initialize eh_tries */ | |
429 | ap->eh_tries = ATA_EH_MAX_TRIES; | |
ad9e2762 | 430 | } else |
e30349d2 | 431 | spin_unlock_wait(ap->lock); |
ad9e2762 TH |
432 | |
433 | repeat: | |
434 | /* invoke error handler */ | |
435 | if (ap->ops->error_handler) { | |
cf1b86c8 TH |
436 | struct ata_link *link; |
437 | ||
5ddf24c5 TH |
438 | /* kill fast drain timer */ |
439 | del_timer_sync(&ap->fastdrain_timer); | |
440 | ||
500530f6 TH |
441 | /* process port resume request */ |
442 | ata_eh_handle_port_resume(ap); | |
443 | ||
f3e81b19 | 444 | /* fetch & clear EH info */ |
e30349d2 | 445 | spin_lock_irqsave(ap->lock, flags); |
f3e81b19 | 446 | |
cf1b86c8 TH |
447 | __ata_port_for_each_link(link, ap) { |
448 | memset(&link->eh_context, 0, sizeof(link->eh_context)); | |
449 | link->eh_context.i = link->eh_info; | |
450 | memset(&link->eh_info, 0, sizeof(link->eh_info)); | |
451 | } | |
f3e81b19 | 452 | |
b51e9e5d TH |
453 | ap->pflags |= ATA_PFLAG_EH_IN_PROGRESS; |
454 | ap->pflags &= ~ATA_PFLAG_EH_PENDING; | |
da917d69 | 455 | ap->excl_link = NULL; /* don't maintain exclusion over EH */ |
f3e81b19 | 456 | |
e30349d2 | 457 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 | 458 | |
500530f6 TH |
459 | /* invoke EH, skip if unloading or suspended */ |
460 | if (!(ap->pflags & (ATA_PFLAG_UNLOADING | ATA_PFLAG_SUSPENDED))) | |
720ba126 TH |
461 | ap->ops->error_handler(ap); |
462 | else | |
463 | ata_eh_finish(ap); | |
ad9e2762 | 464 | |
500530f6 TH |
465 | /* process port suspend request */ |
466 | ata_eh_handle_port_suspend(ap); | |
467 | ||
ad9e2762 TH |
468 | /* Exception might have happend after ->error_handler |
469 | * recovered the port but before this point. Repeat | |
470 | * EH in such case. | |
471 | */ | |
e30349d2 | 472 | spin_lock_irqsave(ap->lock, flags); |
ad9e2762 | 473 | |
b51e9e5d | 474 | if (ap->pflags & ATA_PFLAG_EH_PENDING) { |
a1e10f7e | 475 | if (--ap->eh_tries) { |
e30349d2 | 476 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 TH |
477 | goto repeat; |
478 | } | |
479 | ata_port_printk(ap, KERN_ERR, "EH pending after %d " | |
a1e10f7e | 480 | "tries, giving up\n", ATA_EH_MAX_TRIES); |
914616a3 | 481 | ap->pflags &= ~ATA_PFLAG_EH_PENDING; |
ad9e2762 TH |
482 | } |
483 | ||
f3e81b19 | 484 | /* this run is complete, make sure EH info is clear */ |
cf1b86c8 TH |
485 | __ata_port_for_each_link(link, ap) |
486 | memset(&link->eh_info, 0, sizeof(link->eh_info)); | |
f3e81b19 | 487 | |
e30349d2 | 488 | /* Clear host_eh_scheduled while holding ap->lock such |
ad9e2762 TH |
489 | * that if exception occurs after this point but |
490 | * before EH completion, SCSI midlayer will | |
491 | * re-initiate EH. | |
492 | */ | |
493 | host->host_eh_scheduled = 0; | |
494 | ||
e30349d2 | 495 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 | 496 | } else { |
9af5c9c9 | 497 | WARN_ON(ata_qc_from_tag(ap, ap->link.active_tag) == NULL); |
ad9e2762 TH |
498 | ap->ops->eng_timeout(ap); |
499 | } | |
ece1d636 | 500 | |
ad9e2762 | 501 | /* finish or retry handled scmd's and clean up */ |
ece1d636 TH |
502 | WARN_ON(host->host_failed || !list_empty(&host->eh_cmd_q)); |
503 | ||
504 | scsi_eh_flush_done_q(&ap->eh_done_q); | |
505 | ||
ad9e2762 | 506 | /* clean up */ |
e30349d2 | 507 | spin_lock_irqsave(ap->lock, flags); |
ad9e2762 | 508 | |
1cdaf534 | 509 | if (ap->pflags & ATA_PFLAG_LOADING) |
b51e9e5d | 510 | ap->pflags &= ~ATA_PFLAG_LOADING; |
1cdaf534 | 511 | else if (ap->pflags & ATA_PFLAG_SCSI_HOTPLUG) |
52bad64d | 512 | queue_delayed_work(ata_aux_wq, &ap->hotplug_task, 0); |
1cdaf534 TH |
513 | |
514 | if (ap->pflags & ATA_PFLAG_RECOVERED) | |
515 | ata_port_printk(ap, KERN_INFO, "EH complete\n"); | |
580b2102 | 516 | |
b51e9e5d | 517 | ap->pflags &= ~(ATA_PFLAG_SCSI_HOTPLUG | ATA_PFLAG_RECOVERED); |
ad9e2762 | 518 | |
c6cf9e99 | 519 | /* tell wait_eh that we're done */ |
b51e9e5d | 520 | ap->pflags &= ~ATA_PFLAG_EH_IN_PROGRESS; |
c6cf9e99 TH |
521 | wake_up_all(&ap->eh_wait_q); |
522 | ||
e30349d2 | 523 | spin_unlock_irqrestore(ap->lock, flags); |
ad9e2762 | 524 | |
ece1d636 | 525 | DPRINTK("EXIT\n"); |
ece1d636 TH |
526 | } |
527 | ||
c6cf9e99 TH |
528 | /** |
529 | * ata_port_wait_eh - Wait for the currently pending EH to complete | |
530 | * @ap: Port to wait EH for | |
531 | * | |
532 | * Wait until the currently pending EH is complete. | |
533 | * | |
534 | * LOCKING: | |
535 | * Kernel thread context (may sleep). | |
536 | */ | |
537 | void ata_port_wait_eh(struct ata_port *ap) | |
538 | { | |
539 | unsigned long flags; | |
540 | DEFINE_WAIT(wait); | |
541 | ||
542 | retry: | |
ba6a1308 | 543 | spin_lock_irqsave(ap->lock, flags); |
c6cf9e99 | 544 | |
b51e9e5d | 545 | while (ap->pflags & (ATA_PFLAG_EH_PENDING | ATA_PFLAG_EH_IN_PROGRESS)) { |
c6cf9e99 | 546 | prepare_to_wait(&ap->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE); |
ba6a1308 | 547 | spin_unlock_irqrestore(ap->lock, flags); |
c6cf9e99 | 548 | schedule(); |
ba6a1308 | 549 | spin_lock_irqsave(ap->lock, flags); |
c6cf9e99 | 550 | } |
0a1b622e | 551 | finish_wait(&ap->eh_wait_q, &wait); |
c6cf9e99 | 552 | |
ba6a1308 | 553 | spin_unlock_irqrestore(ap->lock, flags); |
c6cf9e99 TH |
554 | |
555 | /* make sure SCSI EH is complete */ | |
cca3974e | 556 | if (scsi_host_in_recovery(ap->scsi_host)) { |
c6cf9e99 TH |
557 | msleep(10); |
558 | goto retry; | |
559 | } | |
560 | } | |
561 | ||
5ddf24c5 TH |
562 | static int ata_eh_nr_in_flight(struct ata_port *ap) |
563 | { | |
564 | unsigned int tag; | |
565 | int nr = 0; | |
566 | ||
567 | /* count only non-internal commands */ | |
568 | for (tag = 0; tag < ATA_MAX_QUEUE - 1; tag++) | |
569 | if (ata_qc_from_tag(ap, tag)) | |
570 | nr++; | |
571 | ||
572 | return nr; | |
573 | } | |
574 | ||
575 | void ata_eh_fastdrain_timerfn(unsigned long arg) | |
576 | { | |
577 | struct ata_port *ap = (void *)arg; | |
578 | unsigned long flags; | |
579 | int cnt; | |
580 | ||
581 | spin_lock_irqsave(ap->lock, flags); | |
582 | ||
583 | cnt = ata_eh_nr_in_flight(ap); | |
584 | ||
585 | /* are we done? */ | |
586 | if (!cnt) | |
587 | goto out_unlock; | |
588 | ||
589 | if (cnt == ap->fastdrain_cnt) { | |
590 | unsigned int tag; | |
591 | ||
592 | /* No progress during the last interval, tag all | |
593 | * in-flight qcs as timed out and freeze the port. | |
594 | */ | |
595 | for (tag = 0; tag < ATA_MAX_QUEUE - 1; tag++) { | |
596 | struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag); | |
597 | if (qc) | |
598 | qc->err_mask |= AC_ERR_TIMEOUT; | |
599 | } | |
600 | ||
601 | ata_port_freeze(ap); | |
602 | } else { | |
603 | /* some qcs have finished, give it another chance */ | |
604 | ap->fastdrain_cnt = cnt; | |
605 | ap->fastdrain_timer.expires = | |
606 | jiffies + ATA_EH_FASTDRAIN_INTERVAL; | |
607 | add_timer(&ap->fastdrain_timer); | |
608 | } | |
609 | ||
610 | out_unlock: | |
611 | spin_unlock_irqrestore(ap->lock, flags); | |
612 | } | |
613 | ||
614 | /** | |
615 | * ata_eh_set_pending - set ATA_PFLAG_EH_PENDING and activate fast drain | |
616 | * @ap: target ATA port | |
617 | * @fastdrain: activate fast drain | |
618 | * | |
619 | * Set ATA_PFLAG_EH_PENDING and activate fast drain if @fastdrain | |
620 | * is non-zero and EH wasn't pending before. Fast drain ensures | |
621 | * that EH kicks in in timely manner. | |
622 | * | |
623 | * LOCKING: | |
624 | * spin_lock_irqsave(host lock) | |
625 | */ | |
626 | static void ata_eh_set_pending(struct ata_port *ap, int fastdrain) | |
627 | { | |
628 | int cnt; | |
629 | ||
630 | /* already scheduled? */ | |
631 | if (ap->pflags & ATA_PFLAG_EH_PENDING) | |
632 | return; | |
633 | ||
634 | ap->pflags |= ATA_PFLAG_EH_PENDING; | |
635 | ||
636 | if (!fastdrain) | |
637 | return; | |
638 | ||
639 | /* do we have in-flight qcs? */ | |
640 | cnt = ata_eh_nr_in_flight(ap); | |
641 | if (!cnt) | |
642 | return; | |
643 | ||
644 | /* activate fast drain */ | |
645 | ap->fastdrain_cnt = cnt; | |
646 | ap->fastdrain_timer.expires = jiffies + ATA_EH_FASTDRAIN_INTERVAL; | |
647 | add_timer(&ap->fastdrain_timer); | |
648 | } | |
649 | ||
f686bcb8 TH |
650 | /** |
651 | * ata_qc_schedule_eh - schedule qc for error handling | |
652 | * @qc: command to schedule error handling for | |
653 | * | |
654 | * Schedule error handling for @qc. EH will kick in as soon as | |
655 | * other commands are drained. | |
656 | * | |
657 | * LOCKING: | |
cca3974e | 658 | * spin_lock_irqsave(host lock) |
f686bcb8 TH |
659 | */ |
660 | void ata_qc_schedule_eh(struct ata_queued_cmd *qc) | |
661 | { | |
662 | struct ata_port *ap = qc->ap; | |
663 | ||
664 | WARN_ON(!ap->ops->error_handler); | |
665 | ||
666 | qc->flags |= ATA_QCFLAG_FAILED; | |
5ddf24c5 | 667 | ata_eh_set_pending(ap, 1); |
f686bcb8 TH |
668 | |
669 | /* The following will fail if timeout has already expired. | |
670 | * ata_scsi_error() takes care of such scmds on EH entry. | |
671 | * Note that ATA_QCFLAG_FAILED is unconditionally set after | |
672 | * this function completes. | |
673 | */ | |
674 | scsi_req_abort_cmd(qc->scsicmd); | |
675 | } | |
676 | ||
7b70fc03 TH |
677 | /** |
678 | * ata_port_schedule_eh - schedule error handling without a qc | |
679 | * @ap: ATA port to schedule EH for | |
680 | * | |
681 | * Schedule error handling for @ap. EH will kick in as soon as | |
682 | * all commands are drained. | |
683 | * | |
684 | * LOCKING: | |
cca3974e | 685 | * spin_lock_irqsave(host lock) |
7b70fc03 TH |
686 | */ |
687 | void ata_port_schedule_eh(struct ata_port *ap) | |
688 | { | |
689 | WARN_ON(!ap->ops->error_handler); | |
690 | ||
f4d6d004 TH |
691 | if (ap->pflags & ATA_PFLAG_INITIALIZING) |
692 | return; | |
693 | ||
5ddf24c5 | 694 | ata_eh_set_pending(ap, 1); |
cca3974e | 695 | scsi_schedule_eh(ap->scsi_host); |
7b70fc03 TH |
696 | |
697 | DPRINTK("port EH scheduled\n"); | |
698 | } | |
699 | ||
dbd82616 | 700 | static int ata_do_link_abort(struct ata_port *ap, struct ata_link *link) |
7b70fc03 TH |
701 | { |
702 | int tag, nr_aborted = 0; | |
703 | ||
704 | WARN_ON(!ap->ops->error_handler); | |
705 | ||
5ddf24c5 TH |
706 | /* we're gonna abort all commands, no need for fast drain */ |
707 | ata_eh_set_pending(ap, 0); | |
708 | ||
7b70fc03 TH |
709 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { |
710 | struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag); | |
711 | ||
dbd82616 | 712 | if (qc && (!link || qc->dev->link == link)) { |
7b70fc03 TH |
713 | qc->flags |= ATA_QCFLAG_FAILED; |
714 | ata_qc_complete(qc); | |
715 | nr_aborted++; | |
716 | } | |
717 | } | |
718 | ||
719 | if (!nr_aborted) | |
720 | ata_port_schedule_eh(ap); | |
721 | ||
722 | return nr_aborted; | |
723 | } | |
724 | ||
dbd82616 TH |
725 | /** |
726 | * ata_link_abort - abort all qc's on the link | |
727 | * @link: ATA link to abort qc's for | |
728 | * | |
729 | * Abort all active qc's active on @link and schedule EH. | |
730 | * | |
731 | * LOCKING: | |
732 | * spin_lock_irqsave(host lock) | |
733 | * | |
734 | * RETURNS: | |
735 | * Number of aborted qc's. | |
736 | */ | |
737 | int ata_link_abort(struct ata_link *link) | |
738 | { | |
739 | return ata_do_link_abort(link->ap, link); | |
740 | } | |
741 | ||
742 | /** | |
743 | * ata_port_abort - abort all qc's on the port | |
744 | * @ap: ATA port to abort qc's for | |
745 | * | |
746 | * Abort all active qc's of @ap and schedule EH. | |
747 | * | |
748 | * LOCKING: | |
749 | * spin_lock_irqsave(host_set lock) | |
750 | * | |
751 | * RETURNS: | |
752 | * Number of aborted qc's. | |
753 | */ | |
754 | int ata_port_abort(struct ata_port *ap) | |
755 | { | |
756 | return ata_do_link_abort(ap, NULL); | |
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 | ||
7d77b247 TH |
813 | /** |
814 | * sata_async_notification - SATA async notification handler | |
815 | * @ap: ATA port where async notification is received | |
816 | * | |
817 | * Handler to be called when async notification via SDB FIS is | |
818 | * received. This function schedules EH if necessary. | |
819 | * | |
820 | * LOCKING: | |
821 | * spin_lock_irqsave(host lock) | |
822 | * | |
823 | * RETURNS: | |
824 | * 1 if EH is scheduled, 0 otherwise. | |
825 | */ | |
826 | int sata_async_notification(struct ata_port *ap) | |
827 | { | |
828 | u32 sntf; | |
829 | int rc; | |
830 | ||
831 | if (!(ap->flags & ATA_FLAG_AN)) | |
832 | return 0; | |
833 | ||
834 | rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf); | |
835 | if (rc == 0) | |
836 | sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf); | |
837 | ||
838 | if (!ap->nr_pmp_links || rc) { | |
839 | /* PMP is not attached or SNTF is not available */ | |
840 | if (!ap->nr_pmp_links) { | |
841 | /* PMP is not attached. Check whether ATAPI | |
842 | * AN is configured. If so, notify media | |
843 | * change. | |
844 | */ | |
845 | struct ata_device *dev = ap->link.device; | |
846 | ||
847 | if ((dev->class == ATA_DEV_ATAPI) && | |
848 | (dev->flags & ATA_DFLAG_AN)) | |
849 | ata_scsi_media_change_notify(dev); | |
850 | return 0; | |
851 | } else { | |
852 | /* PMP is attached but SNTF is not available. | |
853 | * ATAPI async media change notification is | |
854 | * not used. The PMP must be reporting PHY | |
855 | * status change, schedule EH. | |
856 | */ | |
857 | ata_port_schedule_eh(ap); | |
858 | return 1; | |
859 | } | |
860 | } else { | |
861 | /* PMP is attached and SNTF is available */ | |
862 | struct ata_link *link; | |
863 | ||
864 | /* check and notify ATAPI AN */ | |
865 | ata_port_for_each_link(link, ap) { | |
866 | if (!(sntf & (1 << link->pmp))) | |
867 | continue; | |
868 | ||
869 | if ((link->device->class == ATA_DEV_ATAPI) && | |
870 | (link->device->flags & ATA_DFLAG_AN)) | |
871 | ata_scsi_media_change_notify(link->device); | |
872 | } | |
873 | ||
874 | /* If PMP is reporting that PHY status of some | |
875 | * downstream ports has changed, schedule EH. | |
876 | */ | |
877 | if (sntf & (1 << SATA_PMP_CTRL_PORT)) { | |
878 | ata_port_schedule_eh(ap); | |
879 | return 1; | |
880 | } | |
881 | ||
882 | return 0; | |
883 | } | |
884 | } | |
885 | ||
e3180499 TH |
886 | /** |
887 | * ata_eh_freeze_port - EH helper to freeze port | |
888 | * @ap: ATA port to freeze | |
889 | * | |
890 | * Freeze @ap. | |
891 | * | |
892 | * LOCKING: | |
893 | * None. | |
894 | */ | |
895 | void ata_eh_freeze_port(struct ata_port *ap) | |
896 | { | |
897 | unsigned long flags; | |
898 | ||
899 | if (!ap->ops->error_handler) | |
900 | return; | |
901 | ||
ba6a1308 | 902 | spin_lock_irqsave(ap->lock, flags); |
e3180499 | 903 | __ata_port_freeze(ap); |
ba6a1308 | 904 | spin_unlock_irqrestore(ap->lock, flags); |
e3180499 TH |
905 | } |
906 | ||
907 | /** | |
908 | * ata_port_thaw_port - EH helper to thaw port | |
909 | * @ap: ATA port to thaw | |
910 | * | |
911 | * Thaw frozen port @ap. | |
912 | * | |
913 | * LOCKING: | |
914 | * None. | |
915 | */ | |
916 | void ata_eh_thaw_port(struct ata_port *ap) | |
917 | { | |
918 | unsigned long flags; | |
919 | ||
920 | if (!ap->ops->error_handler) | |
921 | return; | |
922 | ||
ba6a1308 | 923 | spin_lock_irqsave(ap->lock, flags); |
e3180499 | 924 | |
b51e9e5d | 925 | ap->pflags &= ~ATA_PFLAG_FROZEN; |
e3180499 TH |
926 | |
927 | if (ap->ops->thaw) | |
928 | ap->ops->thaw(ap); | |
929 | ||
ba6a1308 | 930 | spin_unlock_irqrestore(ap->lock, flags); |
e3180499 | 931 | |
44877b4e | 932 | DPRINTK("ata%u port thawed\n", ap->print_id); |
e3180499 TH |
933 | } |
934 | ||
ece1d636 TH |
935 | static void ata_eh_scsidone(struct scsi_cmnd *scmd) |
936 | { | |
937 | /* nada */ | |
938 | } | |
939 | ||
940 | static void __ata_eh_qc_complete(struct ata_queued_cmd *qc) | |
941 | { | |
942 | struct ata_port *ap = qc->ap; | |
943 | struct scsi_cmnd *scmd = qc->scsicmd; | |
944 | unsigned long flags; | |
945 | ||
ba6a1308 | 946 | spin_lock_irqsave(ap->lock, flags); |
ece1d636 TH |
947 | qc->scsidone = ata_eh_scsidone; |
948 | __ata_qc_complete(qc); | |
949 | WARN_ON(ata_tag_valid(qc->tag)); | |
ba6a1308 | 950 | spin_unlock_irqrestore(ap->lock, flags); |
ece1d636 TH |
951 | |
952 | scsi_eh_finish_cmd(scmd, &ap->eh_done_q); | |
953 | } | |
954 | ||
955 | /** | |
956 | * ata_eh_qc_complete - Complete an active ATA command from EH | |
957 | * @qc: Command to complete | |
958 | * | |
959 | * Indicate to the mid and upper layers that an ATA command has | |
960 | * completed. To be used from EH. | |
961 | */ | |
962 | void ata_eh_qc_complete(struct ata_queued_cmd *qc) | |
963 | { | |
964 | struct scsi_cmnd *scmd = qc->scsicmd; | |
965 | scmd->retries = scmd->allowed; | |
966 | __ata_eh_qc_complete(qc); | |
967 | } | |
968 | ||
969 | /** | |
970 | * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH | |
971 | * @qc: Command to retry | |
972 | * | |
973 | * Indicate to the mid and upper layers that an ATA command | |
974 | * should be retried. To be used from EH. | |
975 | * | |
976 | * SCSI midlayer limits the number of retries to scmd->allowed. | |
977 | * scmd->retries is decremented for commands which get retried | |
978 | * due to unrelated failures (qc->err_mask is zero). | |
979 | */ | |
980 | void ata_eh_qc_retry(struct ata_queued_cmd *qc) | |
981 | { | |
982 | struct scsi_cmnd *scmd = qc->scsicmd; | |
983 | if (!qc->err_mask && scmd->retries) | |
984 | scmd->retries--; | |
985 | __ata_eh_qc_complete(qc); | |
986 | } | |
022bdb07 | 987 | |
0ea035a3 TH |
988 | /** |
989 | * ata_eh_detach_dev - detach ATA device | |
990 | * @dev: ATA device to detach | |
991 | * | |
992 | * Detach @dev. | |
993 | * | |
994 | * LOCKING: | |
995 | * None. | |
996 | */ | |
fb7fd614 | 997 | void ata_eh_detach_dev(struct ata_device *dev) |
0ea035a3 | 998 | { |
f58229f8 TH |
999 | struct ata_link *link = dev->link; |
1000 | struct ata_port *ap = link->ap; | |
0ea035a3 TH |
1001 | unsigned long flags; |
1002 | ||
1003 | ata_dev_disable(dev); | |
1004 | ||
ba6a1308 | 1005 | spin_lock_irqsave(ap->lock, flags); |
0ea035a3 TH |
1006 | |
1007 | dev->flags &= ~ATA_DFLAG_DETACH; | |
1008 | ||
1009 | if (ata_scsi_offline_dev(dev)) { | |
1010 | dev->flags |= ATA_DFLAG_DETACHED; | |
b51e9e5d | 1011 | ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG; |
0ea035a3 TH |
1012 | } |
1013 | ||
beb07c1a | 1014 | /* clear per-dev EH actions */ |
f58229f8 TH |
1015 | ata_eh_clear_action(link, dev, &link->eh_info, ATA_EH_PERDEV_MASK); |
1016 | ata_eh_clear_action(link, dev, &link->eh_context.i, ATA_EH_PERDEV_MASK); | |
beb07c1a | 1017 | |
ba6a1308 | 1018 | spin_unlock_irqrestore(ap->lock, flags); |
0ea035a3 TH |
1019 | } |
1020 | ||
022bdb07 TH |
1021 | /** |
1022 | * ata_eh_about_to_do - about to perform eh_action | |
955e57df | 1023 | * @link: target ATA link |
47005f25 | 1024 | * @dev: target ATA dev for per-dev action (can be NULL) |
022bdb07 TH |
1025 | * @action: action about to be performed |
1026 | * | |
1027 | * Called just before performing EH actions to clear related bits | |
955e57df TH |
1028 | * in @link->eh_info such that eh actions are not unnecessarily |
1029 | * repeated. | |
022bdb07 TH |
1030 | * |
1031 | * LOCKING: | |
1032 | * None. | |
1033 | */ | |
fb7fd614 TH |
1034 | void ata_eh_about_to_do(struct ata_link *link, struct ata_device *dev, |
1035 | unsigned int action) | |
022bdb07 | 1036 | { |
955e57df TH |
1037 | struct ata_port *ap = link->ap; |
1038 | struct ata_eh_info *ehi = &link->eh_info; | |
1039 | struct ata_eh_context *ehc = &link->eh_context; | |
022bdb07 TH |
1040 | unsigned long flags; |
1041 | ||
ba6a1308 | 1042 | spin_lock_irqsave(ap->lock, flags); |
1cdaf534 | 1043 | |
13abf50d TH |
1044 | /* Reset is represented by combination of actions and EHI |
1045 | * flags. Suck in all related bits before clearing eh_info to | |
1046 | * avoid losing requested action. | |
1047 | */ | |
1048 | if (action & ATA_EH_RESET_MASK) { | |
1049 | ehc->i.action |= ehi->action & ATA_EH_RESET_MASK; | |
1050 | ehc->i.flags |= ehi->flags & ATA_EHI_RESET_MODIFIER_MASK; | |
1051 | ||
1052 | /* make sure all reset actions are cleared & clear EHI flags */ | |
1053 | action |= ATA_EH_RESET_MASK; | |
1054 | ehi->flags &= ~ATA_EHI_RESET_MODIFIER_MASK; | |
1055 | } | |
1056 | ||
955e57df | 1057 | ata_eh_clear_action(link, dev, ehi, action); |
1cdaf534 | 1058 | |
13abf50d | 1059 | if (!(ehc->i.flags & ATA_EHI_QUIET)) |
1cdaf534 TH |
1060 | ap->pflags |= ATA_PFLAG_RECOVERED; |
1061 | ||
ba6a1308 | 1062 | spin_unlock_irqrestore(ap->lock, flags); |
022bdb07 TH |
1063 | } |
1064 | ||
47005f25 TH |
1065 | /** |
1066 | * ata_eh_done - EH action complete | |
955e57df | 1067 | * @ap: target ATA port |
47005f25 TH |
1068 | * @dev: target ATA dev for per-dev action (can be NULL) |
1069 | * @action: action just completed | |
1070 | * | |
1071 | * Called right after performing EH actions to clear related bits | |
955e57df | 1072 | * in @link->eh_context. |
47005f25 TH |
1073 | * |
1074 | * LOCKING: | |
1075 | * None. | |
1076 | */ | |
fb7fd614 TH |
1077 | void ata_eh_done(struct ata_link *link, struct ata_device *dev, |
1078 | unsigned int action) | |
47005f25 | 1079 | { |
955e57df | 1080 | struct ata_eh_context *ehc = &link->eh_context; |
9af5c9c9 | 1081 | |
13abf50d TH |
1082 | /* if reset is complete, clear all reset actions & reset modifier */ |
1083 | if (action & ATA_EH_RESET_MASK) { | |
1084 | action |= ATA_EH_RESET_MASK; | |
9af5c9c9 | 1085 | ehc->i.flags &= ~ATA_EHI_RESET_MODIFIER_MASK; |
13abf50d TH |
1086 | } |
1087 | ||
955e57df | 1088 | ata_eh_clear_action(link, dev, &ehc->i, action); |
47005f25 TH |
1089 | } |
1090 | ||
022bdb07 TH |
1091 | /** |
1092 | * ata_err_string - convert err_mask to descriptive string | |
1093 | * @err_mask: error mask to convert to string | |
1094 | * | |
1095 | * Convert @err_mask to descriptive string. Errors are | |
1096 | * prioritized according to severity and only the most severe | |
1097 | * error is reported. | |
1098 | * | |
1099 | * LOCKING: | |
1100 | * None. | |
1101 | * | |
1102 | * RETURNS: | |
1103 | * Descriptive string for @err_mask | |
1104 | */ | |
2dcb407e | 1105 | static const char *ata_err_string(unsigned int err_mask) |
022bdb07 TH |
1106 | { |
1107 | if (err_mask & AC_ERR_HOST_BUS) | |
1108 | return "host bus error"; | |
1109 | if (err_mask & AC_ERR_ATA_BUS) | |
1110 | return "ATA bus error"; | |
1111 | if (err_mask & AC_ERR_TIMEOUT) | |
1112 | return "timeout"; | |
1113 | if (err_mask & AC_ERR_HSM) | |
1114 | return "HSM violation"; | |
1115 | if (err_mask & AC_ERR_SYSTEM) | |
1116 | return "internal error"; | |
1117 | if (err_mask & AC_ERR_MEDIA) | |
1118 | return "media error"; | |
1119 | if (err_mask & AC_ERR_INVALID) | |
1120 | return "invalid argument"; | |
1121 | if (err_mask & AC_ERR_DEV) | |
1122 | return "device error"; | |
1123 | return "unknown error"; | |
1124 | } | |
1125 | ||
e8ee8451 TH |
1126 | /** |
1127 | * ata_read_log_page - read a specific log page | |
1128 | * @dev: target device | |
1129 | * @page: page to read | |
1130 | * @buf: buffer to store read page | |
1131 | * @sectors: number of sectors to read | |
1132 | * | |
1133 | * Read log page using READ_LOG_EXT command. | |
1134 | * | |
1135 | * LOCKING: | |
1136 | * Kernel thread context (may sleep). | |
1137 | * | |
1138 | * RETURNS: | |
1139 | * 0 on success, AC_ERR_* mask otherwise. | |
1140 | */ | |
1141 | static unsigned int ata_read_log_page(struct ata_device *dev, | |
1142 | u8 page, void *buf, unsigned int sectors) | |
1143 | { | |
1144 | struct ata_taskfile tf; | |
1145 | unsigned int err_mask; | |
1146 | ||
1147 | DPRINTK("read log page - page %d\n", page); | |
1148 | ||
1149 | ata_tf_init(dev, &tf); | |
1150 | tf.command = ATA_CMD_READ_LOG_EXT; | |
1151 | tf.lbal = page; | |
1152 | tf.nsect = sectors; | |
1153 | tf.hob_nsect = sectors >> 8; | |
1154 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_LBA48 | ATA_TFLAG_DEVICE; | |
1155 | tf.protocol = ATA_PROT_PIO; | |
1156 | ||
1157 | err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE, | |
2b789108 | 1158 | buf, sectors * ATA_SECT_SIZE, 0); |
e8ee8451 TH |
1159 | |
1160 | DPRINTK("EXIT, err_mask=%x\n", err_mask); | |
1161 | return err_mask; | |
1162 | } | |
1163 | ||
1164 | /** | |
1165 | * ata_eh_read_log_10h - Read log page 10h for NCQ error details | |
1166 | * @dev: Device to read log page 10h from | |
1167 | * @tag: Resulting tag of the failed command | |
1168 | * @tf: Resulting taskfile registers of the failed command | |
1169 | * | |
1170 | * Read log page 10h to obtain NCQ error details and clear error | |
1171 | * condition. | |
1172 | * | |
1173 | * LOCKING: | |
1174 | * Kernel thread context (may sleep). | |
1175 | * | |
1176 | * RETURNS: | |
1177 | * 0 on success, -errno otherwise. | |
1178 | */ | |
1179 | static int ata_eh_read_log_10h(struct ata_device *dev, | |
1180 | int *tag, struct ata_taskfile *tf) | |
1181 | { | |
9af5c9c9 | 1182 | u8 *buf = dev->link->ap->sector_buf; |
e8ee8451 TH |
1183 | unsigned int err_mask; |
1184 | u8 csum; | |
1185 | int i; | |
1186 | ||
1187 | err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, buf, 1); | |
1188 | if (err_mask) | |
1189 | return -EIO; | |
1190 | ||
1191 | csum = 0; | |
1192 | for (i = 0; i < ATA_SECT_SIZE; i++) | |
1193 | csum += buf[i]; | |
1194 | if (csum) | |
1195 | ata_dev_printk(dev, KERN_WARNING, | |
1196 | "invalid checksum 0x%x on log page 10h\n", csum); | |
1197 | ||
1198 | if (buf[0] & 0x80) | |
1199 | return -ENOENT; | |
1200 | ||
1201 | *tag = buf[0] & 0x1f; | |
1202 | ||
1203 | tf->command = buf[2]; | |
1204 | tf->feature = buf[3]; | |
1205 | tf->lbal = buf[4]; | |
1206 | tf->lbam = buf[5]; | |
1207 | tf->lbah = buf[6]; | |
1208 | tf->device = buf[7]; | |
1209 | tf->hob_lbal = buf[8]; | |
1210 | tf->hob_lbam = buf[9]; | |
1211 | tf->hob_lbah = buf[10]; | |
1212 | tf->nsect = buf[12]; | |
1213 | tf->hob_nsect = buf[13]; | |
1214 | ||
1215 | return 0; | |
1216 | } | |
1217 | ||
022bdb07 TH |
1218 | /** |
1219 | * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE | |
1220 | * @dev: device to perform REQUEST_SENSE to | |
1221 | * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long) | |
1222 | * | |
1223 | * Perform ATAPI REQUEST_SENSE after the device reported CHECK | |
1224 | * SENSE. This function is EH helper. | |
1225 | * | |
1226 | * LOCKING: | |
1227 | * Kernel thread context (may sleep). | |
1228 | * | |
1229 | * RETURNS: | |
1230 | * 0 on success, AC_ERR_* mask on failure | |
1231 | */ | |
56287768 | 1232 | static unsigned int atapi_eh_request_sense(struct ata_queued_cmd *qc) |
022bdb07 | 1233 | { |
56287768 AL |
1234 | struct ata_device *dev = qc->dev; |
1235 | unsigned char *sense_buf = qc->scsicmd->sense_buffer; | |
9af5c9c9 | 1236 | struct ata_port *ap = dev->link->ap; |
022bdb07 TH |
1237 | struct ata_taskfile tf; |
1238 | u8 cdb[ATAPI_CDB_LEN]; | |
1239 | ||
1240 | DPRINTK("ATAPI request sense\n"); | |
1241 | ||
022bdb07 TH |
1242 | /* FIXME: is this needed? */ |
1243 | memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE); | |
1244 | ||
56287768 AL |
1245 | /* initialize sense_buf with the error register, |
1246 | * for the case where they are -not- overwritten | |
1247 | */ | |
022bdb07 | 1248 | sense_buf[0] = 0x70; |
56287768 AL |
1249 | sense_buf[2] = qc->result_tf.feature >> 4; |
1250 | ||
a617c09f | 1251 | /* some devices time out if garbage left in tf */ |
56287768 | 1252 | ata_tf_init(dev, &tf); |
022bdb07 TH |
1253 | |
1254 | memset(cdb, 0, ATAPI_CDB_LEN); | |
1255 | cdb[0] = REQUEST_SENSE; | |
1256 | cdb[4] = SCSI_SENSE_BUFFERSIZE; | |
1257 | ||
1258 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; | |
1259 | tf.command = ATA_CMD_PACKET; | |
1260 | ||
1261 | /* is it pointless to prefer PIO for "safety reasons"? */ | |
1262 | if (ap->flags & ATA_FLAG_PIO_DMA) { | |
1263 | tf.protocol = ATA_PROT_ATAPI_DMA; | |
1264 | tf.feature |= ATAPI_PKT_DMA; | |
1265 | } else { | |
1266 | tf.protocol = ATA_PROT_ATAPI; | |
1267 | tf.lbam = (8 * 1024) & 0xff; | |
1268 | tf.lbah = (8 * 1024) >> 8; | |
1269 | } | |
1270 | ||
1271 | return ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE, | |
2b789108 | 1272 | sense_buf, SCSI_SENSE_BUFFERSIZE, 0); |
022bdb07 TH |
1273 | } |
1274 | ||
1275 | /** | |
1276 | * ata_eh_analyze_serror - analyze SError for a failed port | |
0260731f | 1277 | * @link: ATA link to analyze SError for |
022bdb07 TH |
1278 | * |
1279 | * Analyze SError if available and further determine cause of | |
1280 | * failure. | |
1281 | * | |
1282 | * LOCKING: | |
1283 | * None. | |
1284 | */ | |
0260731f | 1285 | static void ata_eh_analyze_serror(struct ata_link *link) |
022bdb07 | 1286 | { |
0260731f | 1287 | struct ata_eh_context *ehc = &link->eh_context; |
022bdb07 TH |
1288 | u32 serror = ehc->i.serror; |
1289 | unsigned int err_mask = 0, action = 0; | |
f9df58cb | 1290 | u32 hotplug_mask; |
022bdb07 TH |
1291 | |
1292 | if (serror & SERR_PERSISTENT) { | |
1293 | err_mask |= AC_ERR_ATA_BUS; | |
1294 | action |= ATA_EH_HARDRESET; | |
1295 | } | |
1296 | if (serror & | |
1297 | (SERR_DATA_RECOVERED | SERR_COMM_RECOVERED | SERR_DATA)) { | |
1298 | err_mask |= AC_ERR_ATA_BUS; | |
1299 | action |= ATA_EH_SOFTRESET; | |
1300 | } | |
1301 | if (serror & SERR_PROTOCOL) { | |
1302 | err_mask |= AC_ERR_HSM; | |
1303 | action |= ATA_EH_SOFTRESET; | |
1304 | } | |
1305 | if (serror & SERR_INTERNAL) { | |
1306 | err_mask |= AC_ERR_SYSTEM; | |
771b8dad | 1307 | action |= ATA_EH_HARDRESET; |
022bdb07 | 1308 | } |
f9df58cb TH |
1309 | |
1310 | /* Determine whether a hotplug event has occurred. Both | |
1311 | * SError.N/X are considered hotplug events for enabled or | |
1312 | * host links. For disabled PMP links, only N bit is | |
1313 | * considered as X bit is left at 1 for link plugging. | |
1314 | */ | |
1315 | hotplug_mask = 0; | |
1316 | ||
1317 | if (!(link->flags & ATA_LFLAG_DISABLED) || ata_is_host_link(link)) | |
1318 | hotplug_mask = SERR_PHYRDY_CHG | SERR_DEV_XCHG; | |
1319 | else | |
1320 | hotplug_mask = SERR_PHYRDY_CHG; | |
1321 | ||
1322 | if (serror & hotplug_mask) | |
084fe639 | 1323 | ata_ehi_hotplugged(&ehc->i); |
022bdb07 TH |
1324 | |
1325 | ehc->i.err_mask |= err_mask; | |
1326 | ehc->i.action |= action; | |
1327 | } | |
1328 | ||
e8ee8451 TH |
1329 | /** |
1330 | * ata_eh_analyze_ncq_error - analyze NCQ error | |
0260731f | 1331 | * @link: ATA link to analyze NCQ error for |
e8ee8451 TH |
1332 | * |
1333 | * Read log page 10h, determine the offending qc and acquire | |
1334 | * error status TF. For NCQ device errors, all LLDDs have to do | |
1335 | * is setting AC_ERR_DEV in ehi->err_mask. This function takes | |
1336 | * care of the rest. | |
1337 | * | |
1338 | * LOCKING: | |
1339 | * Kernel thread context (may sleep). | |
1340 | */ | |
0260731f | 1341 | static void ata_eh_analyze_ncq_error(struct ata_link *link) |
e8ee8451 | 1342 | { |
0260731f TH |
1343 | struct ata_port *ap = link->ap; |
1344 | struct ata_eh_context *ehc = &link->eh_context; | |
1345 | struct ata_device *dev = link->device; | |
e8ee8451 TH |
1346 | struct ata_queued_cmd *qc; |
1347 | struct ata_taskfile tf; | |
1348 | int tag, rc; | |
1349 | ||
1350 | /* if frozen, we can't do much */ | |
b51e9e5d | 1351 | if (ap->pflags & ATA_PFLAG_FROZEN) |
e8ee8451 TH |
1352 | return; |
1353 | ||
1354 | /* is it NCQ device error? */ | |
0260731f | 1355 | if (!link->sactive || !(ehc->i.err_mask & AC_ERR_DEV)) |
e8ee8451 TH |
1356 | return; |
1357 | ||
1358 | /* has LLDD analyzed already? */ | |
1359 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1360 | qc = __ata_qc_from_tag(ap, tag); | |
1361 | ||
1362 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
1363 | continue; | |
1364 | ||
1365 | if (qc->err_mask) | |
1366 | return; | |
1367 | } | |
1368 | ||
1369 | /* okay, this error is ours */ | |
1370 | rc = ata_eh_read_log_10h(dev, &tag, &tf); | |
1371 | if (rc) { | |
0260731f | 1372 | ata_link_printk(link, KERN_ERR, "failed to read log page 10h " |
e8ee8451 TH |
1373 | "(errno=%d)\n", rc); |
1374 | return; | |
1375 | } | |
1376 | ||
0260731f TH |
1377 | if (!(link->sactive & (1 << tag))) { |
1378 | ata_link_printk(link, KERN_ERR, "log page 10h reported " | |
e8ee8451 TH |
1379 | "inactive tag %d\n", tag); |
1380 | return; | |
1381 | } | |
1382 | ||
1383 | /* we've got the perpetrator, condemn it */ | |
1384 | qc = __ata_qc_from_tag(ap, tag); | |
1385 | memcpy(&qc->result_tf, &tf, sizeof(tf)); | |
5335b729 | 1386 | qc->err_mask |= AC_ERR_DEV | AC_ERR_NCQ; |
e8ee8451 TH |
1387 | ehc->i.err_mask &= ~AC_ERR_DEV; |
1388 | } | |
1389 | ||
022bdb07 TH |
1390 | /** |
1391 | * ata_eh_analyze_tf - analyze taskfile of a failed qc | |
1392 | * @qc: qc to analyze | |
1393 | * @tf: Taskfile registers to analyze | |
1394 | * | |
1395 | * Analyze taskfile of @qc and further determine cause of | |
1396 | * failure. This function also requests ATAPI sense data if | |
1397 | * avaliable. | |
1398 | * | |
1399 | * LOCKING: | |
1400 | * Kernel thread context (may sleep). | |
1401 | * | |
1402 | * RETURNS: | |
1403 | * Determined recovery action | |
1404 | */ | |
1405 | static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd *qc, | |
1406 | const struct ata_taskfile *tf) | |
1407 | { | |
1408 | unsigned int tmp, action = 0; | |
1409 | u8 stat = tf->command, err = tf->feature; | |
1410 | ||
1411 | if ((stat & (ATA_BUSY | ATA_DRQ | ATA_DRDY)) != ATA_DRDY) { | |
1412 | qc->err_mask |= AC_ERR_HSM; | |
1413 | return ATA_EH_SOFTRESET; | |
1414 | } | |
1415 | ||
a51d644a TH |
1416 | if (stat & (ATA_ERR | ATA_DF)) |
1417 | qc->err_mask |= AC_ERR_DEV; | |
1418 | else | |
022bdb07 TH |
1419 | return 0; |
1420 | ||
1421 | switch (qc->dev->class) { | |
1422 | case ATA_DEV_ATA: | |
1423 | if (err & ATA_ICRC) | |
1424 | qc->err_mask |= AC_ERR_ATA_BUS; | |
1425 | if (err & ATA_UNC) | |
1426 | qc->err_mask |= AC_ERR_MEDIA; | |
1427 | if (err & ATA_IDNF) | |
1428 | qc->err_mask |= AC_ERR_INVALID; | |
1429 | break; | |
1430 | ||
1431 | case ATA_DEV_ATAPI: | |
a569a30d | 1432 | if (!(qc->ap->pflags & ATA_PFLAG_FROZEN)) { |
56287768 | 1433 | tmp = atapi_eh_request_sense(qc); |
a569a30d TH |
1434 | if (!tmp) { |
1435 | /* ATA_QCFLAG_SENSE_VALID is used to | |
1436 | * tell atapi_qc_complete() that sense | |
1437 | * data is already valid. | |
1438 | * | |
1439 | * TODO: interpret sense data and set | |
1440 | * appropriate err_mask. | |
1441 | */ | |
1442 | qc->flags |= ATA_QCFLAG_SENSE_VALID; | |
1443 | } else | |
1444 | qc->err_mask |= tmp; | |
1445 | } | |
022bdb07 TH |
1446 | } |
1447 | ||
1448 | if (qc->err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT | AC_ERR_ATA_BUS)) | |
1449 | action |= ATA_EH_SOFTRESET; | |
1450 | ||
1451 | return action; | |
1452 | } | |
1453 | ||
7d47e8d4 | 1454 | static int ata_eh_categorize_error(int is_io, unsigned int err_mask) |
022bdb07 | 1455 | { |
7d47e8d4 | 1456 | if (err_mask & AC_ERR_ATA_BUS) |
022bdb07 TH |
1457 | return 1; |
1458 | ||
7d47e8d4 TH |
1459 | if (err_mask & AC_ERR_TIMEOUT) |
1460 | return 2; | |
1461 | ||
1462 | if (is_io) { | |
1463 | if (err_mask & AC_ERR_HSM) | |
022bdb07 | 1464 | return 2; |
7d47e8d4 TH |
1465 | if ((err_mask & |
1466 | (AC_ERR_DEV|AC_ERR_MEDIA|AC_ERR_INVALID)) == AC_ERR_DEV) | |
1467 | return 3; | |
022bdb07 TH |
1468 | } |
1469 | ||
1470 | return 0; | |
1471 | } | |
1472 | ||
7d47e8d4 | 1473 | struct speed_down_verdict_arg { |
022bdb07 | 1474 | u64 since; |
7d47e8d4 | 1475 | int nr_errors[4]; |
022bdb07 TH |
1476 | }; |
1477 | ||
7d47e8d4 | 1478 | static int speed_down_verdict_cb(struct ata_ering_entry *ent, void *void_arg) |
022bdb07 | 1479 | { |
7d47e8d4 TH |
1480 | struct speed_down_verdict_arg *arg = void_arg; |
1481 | int cat = ata_eh_categorize_error(ent->is_io, ent->err_mask); | |
022bdb07 TH |
1482 | |
1483 | if (ent->timestamp < arg->since) | |
1484 | return -1; | |
1485 | ||
7d47e8d4 | 1486 | arg->nr_errors[cat]++; |
022bdb07 TH |
1487 | return 0; |
1488 | } | |
1489 | ||
1490 | /** | |
7d47e8d4 | 1491 | * ata_eh_speed_down_verdict - Determine speed down verdict |
022bdb07 TH |
1492 | * @dev: Device of interest |
1493 | * | |
1494 | * This function examines error ring of @dev and determines | |
7d47e8d4 TH |
1495 | * whether NCQ needs to be turned off, transfer speed should be |
1496 | * stepped down, or falling back to PIO is necessary. | |
022bdb07 | 1497 | * |
7d47e8d4 | 1498 | * Cat-1 is ATA_BUS error for any command. |
022bdb07 | 1499 | * |
7d47e8d4 TH |
1500 | * Cat-2 is TIMEOUT for any command or HSM violation for known |
1501 | * supported commands. | |
1502 | * | |
1503 | * Cat-3 is is unclassified DEV error for known supported | |
022bdb07 TH |
1504 | * command. |
1505 | * | |
7d47e8d4 TH |
1506 | * NCQ needs to be turned off if there have been more than 3 |
1507 | * Cat-2 + Cat-3 errors during last 10 minutes. | |
1508 | * | |
1509 | * Speed down is necessary if there have been more than 3 Cat-1 + | |
1510 | * Cat-2 errors or 10 Cat-3 errors during last 10 minutes. | |
1511 | * | |
1512 | * Falling back to PIO mode is necessary if there have been more | |
1513 | * than 10 Cat-1 + Cat-2 + Cat-3 errors during last 5 minutes. | |
1514 | * | |
022bdb07 TH |
1515 | * LOCKING: |
1516 | * Inherited from caller. | |
1517 | * | |
1518 | * RETURNS: | |
7d47e8d4 | 1519 | * OR of ATA_EH_SPDN_* flags. |
022bdb07 | 1520 | */ |
7d47e8d4 | 1521 | static unsigned int ata_eh_speed_down_verdict(struct ata_device *dev) |
022bdb07 | 1522 | { |
7d47e8d4 TH |
1523 | const u64 j5mins = 5LLU * 60 * HZ, j10mins = 10LLU * 60 * HZ; |
1524 | u64 j64 = get_jiffies_64(); | |
1525 | struct speed_down_verdict_arg arg; | |
1526 | unsigned int verdict = 0; | |
022bdb07 | 1527 | |
7d47e8d4 TH |
1528 | /* scan past 10 mins of error history */ |
1529 | memset(&arg, 0, sizeof(arg)); | |
1530 | arg.since = j64 - min(j64, j10mins); | |
1531 | ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg); | |
022bdb07 | 1532 | |
7d47e8d4 TH |
1533 | if (arg.nr_errors[2] + arg.nr_errors[3] > 3) |
1534 | verdict |= ATA_EH_SPDN_NCQ_OFF; | |
1535 | if (arg.nr_errors[1] + arg.nr_errors[2] > 3 || arg.nr_errors[3] > 10) | |
1536 | verdict |= ATA_EH_SPDN_SPEED_DOWN; | |
022bdb07 | 1537 | |
7d47e8d4 | 1538 | /* scan past 3 mins of error history */ |
022bdb07 | 1539 | memset(&arg, 0, sizeof(arg)); |
7d47e8d4 TH |
1540 | arg.since = j64 - min(j64, j5mins); |
1541 | ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg); | |
022bdb07 | 1542 | |
7d47e8d4 TH |
1543 | if (arg.nr_errors[1] + arg.nr_errors[2] + arg.nr_errors[3] > 10) |
1544 | verdict |= ATA_EH_SPDN_FALLBACK_TO_PIO; | |
022bdb07 | 1545 | |
7d47e8d4 | 1546 | return verdict; |
022bdb07 TH |
1547 | } |
1548 | ||
1549 | /** | |
1550 | * ata_eh_speed_down - record error and speed down if necessary | |
1551 | * @dev: Failed device | |
1552 | * @is_io: Did the device fail during normal IO? | |
1553 | * @err_mask: err_mask of the error | |
1554 | * | |
1555 | * Record error and examine error history to determine whether | |
1556 | * adjusting transmission speed is necessary. It also sets | |
1557 | * transmission limits appropriately if such adjustment is | |
1558 | * necessary. | |
1559 | * | |
1560 | * LOCKING: | |
1561 | * Kernel thread context (may sleep). | |
1562 | * | |
1563 | * RETURNS: | |
7d47e8d4 | 1564 | * Determined recovery action. |
022bdb07 | 1565 | */ |
7d47e8d4 TH |
1566 | static unsigned int ata_eh_speed_down(struct ata_device *dev, int is_io, |
1567 | unsigned int err_mask) | |
022bdb07 | 1568 | { |
7d47e8d4 TH |
1569 | unsigned int verdict; |
1570 | unsigned int action = 0; | |
1571 | ||
1572 | /* don't bother if Cat-0 error */ | |
1573 | if (ata_eh_categorize_error(is_io, err_mask) == 0) | |
022bdb07 TH |
1574 | return 0; |
1575 | ||
1576 | /* record error and determine whether speed down is necessary */ | |
1577 | ata_ering_record(&dev->ering, is_io, err_mask); | |
7d47e8d4 | 1578 | verdict = ata_eh_speed_down_verdict(dev); |
022bdb07 | 1579 | |
7d47e8d4 TH |
1580 | /* turn off NCQ? */ |
1581 | if ((verdict & ATA_EH_SPDN_NCQ_OFF) && | |
1582 | (dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ | | |
1583 | ATA_DFLAG_NCQ_OFF)) == ATA_DFLAG_NCQ) { | |
1584 | dev->flags |= ATA_DFLAG_NCQ_OFF; | |
1585 | ata_dev_printk(dev, KERN_WARNING, | |
1586 | "NCQ disabled due to excessive errors\n"); | |
1587 | goto done; | |
1588 | } | |
022bdb07 | 1589 | |
7d47e8d4 TH |
1590 | /* speed down? */ |
1591 | if (verdict & ATA_EH_SPDN_SPEED_DOWN) { | |
1592 | /* speed down SATA link speed if possible */ | |
936fd732 | 1593 | if (sata_down_spd_limit(dev->link) == 0) { |
7d47e8d4 TH |
1594 | action |= ATA_EH_HARDRESET; |
1595 | goto done; | |
1596 | } | |
022bdb07 | 1597 | |
7d47e8d4 TH |
1598 | /* lower transfer mode */ |
1599 | if (dev->spdn_cnt < 2) { | |
1600 | static const int dma_dnxfer_sel[] = | |
1601 | { ATA_DNXFER_DMA, ATA_DNXFER_40C }; | |
1602 | static const int pio_dnxfer_sel[] = | |
1603 | { ATA_DNXFER_PIO, ATA_DNXFER_FORCE_PIO0 }; | |
1604 | int sel; | |
1605 | ||
1606 | if (dev->xfer_shift != ATA_SHIFT_PIO) | |
1607 | sel = dma_dnxfer_sel[dev->spdn_cnt]; | |
1608 | else | |
1609 | sel = pio_dnxfer_sel[dev->spdn_cnt]; | |
1610 | ||
1611 | dev->spdn_cnt++; | |
1612 | ||
1613 | if (ata_down_xfermask_limit(dev, sel) == 0) { | |
1614 | action |= ATA_EH_SOFTRESET; | |
1615 | goto done; | |
1616 | } | |
1617 | } | |
1618 | } | |
1619 | ||
1620 | /* Fall back to PIO? Slowing down to PIO is meaningless for | |
1621 | * SATA. Consider it only for PATA. | |
1622 | */ | |
1623 | if ((verdict & ATA_EH_SPDN_FALLBACK_TO_PIO) && (dev->spdn_cnt >= 2) && | |
9af5c9c9 | 1624 | (dev->link->ap->cbl != ATA_CBL_SATA) && |
7d47e8d4 TH |
1625 | (dev->xfer_shift != ATA_SHIFT_PIO)) { |
1626 | if (ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO) == 0) { | |
1627 | dev->spdn_cnt = 0; | |
1628 | action |= ATA_EH_SOFTRESET; | |
1629 | goto done; | |
1630 | } | |
1631 | } | |
022bdb07 | 1632 | |
022bdb07 | 1633 | return 0; |
7d47e8d4 TH |
1634 | done: |
1635 | /* device has been slowed down, blow error history */ | |
1636 | ata_ering_clear(&dev->ering); | |
1637 | return action; | |
022bdb07 TH |
1638 | } |
1639 | ||
1640 | /** | |
9b1e2658 TH |
1641 | * ata_eh_link_autopsy - analyze error and determine recovery action |
1642 | * @link: host link to perform autopsy on | |
022bdb07 | 1643 | * |
0260731f TH |
1644 | * Analyze why @link failed and determine which recovery actions |
1645 | * are needed. This function also sets more detailed AC_ERR_* | |
1646 | * values and fills sense data for ATAPI CHECK SENSE. | |
022bdb07 TH |
1647 | * |
1648 | * LOCKING: | |
1649 | * Kernel thread context (may sleep). | |
1650 | */ | |
9b1e2658 | 1651 | static void ata_eh_link_autopsy(struct ata_link *link) |
022bdb07 | 1652 | { |
0260731f | 1653 | struct ata_port *ap = link->ap; |
936fd732 | 1654 | struct ata_eh_context *ehc = &link->eh_context; |
dfcc173d | 1655 | struct ata_device *dev; |
022bdb07 TH |
1656 | unsigned int all_err_mask = 0; |
1657 | int tag, is_io = 0; | |
1658 | u32 serror; | |
1659 | int rc; | |
1660 | ||
1661 | DPRINTK("ENTER\n"); | |
1662 | ||
1cdaf534 TH |
1663 | if (ehc->i.flags & ATA_EHI_NO_AUTOPSY) |
1664 | return; | |
1665 | ||
022bdb07 | 1666 | /* obtain and analyze SError */ |
936fd732 | 1667 | rc = sata_scr_read(link, SCR_ERROR, &serror); |
022bdb07 TH |
1668 | if (rc == 0) { |
1669 | ehc->i.serror |= serror; | |
0260731f | 1670 | ata_eh_analyze_serror(link); |
4e57c517 TH |
1671 | } else if (rc != -EOPNOTSUPP) { |
1672 | /* SError read failed, force hardreset and probing */ | |
1673 | ata_ehi_schedule_probe(&ehc->i); | |
4528e4da | 1674 | ehc->i.action |= ATA_EH_HARDRESET; |
4e57c517 TH |
1675 | ehc->i.err_mask |= AC_ERR_OTHER; |
1676 | } | |
022bdb07 | 1677 | |
e8ee8451 | 1678 | /* analyze NCQ failure */ |
0260731f | 1679 | ata_eh_analyze_ncq_error(link); |
e8ee8451 | 1680 | |
022bdb07 TH |
1681 | /* any real error trumps AC_ERR_OTHER */ |
1682 | if (ehc->i.err_mask & ~AC_ERR_OTHER) | |
1683 | ehc->i.err_mask &= ~AC_ERR_OTHER; | |
1684 | ||
1685 | all_err_mask |= ehc->i.err_mask; | |
1686 | ||
1687 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1688 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
1689 | ||
0260731f | 1690 | if (!(qc->flags & ATA_QCFLAG_FAILED) || qc->dev->link != link) |
022bdb07 TH |
1691 | continue; |
1692 | ||
1693 | /* inherit upper level err_mask */ | |
1694 | qc->err_mask |= ehc->i.err_mask; | |
1695 | ||
022bdb07 | 1696 | /* analyze TF */ |
4528e4da | 1697 | ehc->i.action |= ata_eh_analyze_tf(qc, &qc->result_tf); |
022bdb07 TH |
1698 | |
1699 | /* DEV errors are probably spurious in case of ATA_BUS error */ | |
1700 | if (qc->err_mask & AC_ERR_ATA_BUS) | |
1701 | qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_MEDIA | | |
1702 | AC_ERR_INVALID); | |
1703 | ||
1704 | /* any real error trumps unknown error */ | |
1705 | if (qc->err_mask & ~AC_ERR_OTHER) | |
1706 | qc->err_mask &= ~AC_ERR_OTHER; | |
1707 | ||
1708 | /* SENSE_VALID trumps dev/unknown error and revalidation */ | |
f90f0828 | 1709 | if (qc->flags & ATA_QCFLAG_SENSE_VALID) |
022bdb07 | 1710 | qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_OTHER); |
022bdb07 TH |
1711 | |
1712 | /* accumulate error info */ | |
4528e4da | 1713 | ehc->i.dev = qc->dev; |
022bdb07 TH |
1714 | all_err_mask |= qc->err_mask; |
1715 | if (qc->flags & ATA_QCFLAG_IO) | |
1716 | is_io = 1; | |
1717 | } | |
1718 | ||
a20f33ff | 1719 | /* enforce default EH actions */ |
b51e9e5d | 1720 | if (ap->pflags & ATA_PFLAG_FROZEN || |
a20f33ff | 1721 | all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT)) |
4528e4da | 1722 | ehc->i.action |= ATA_EH_SOFTRESET; |
f90f0828 TH |
1723 | else if ((is_io && all_err_mask) || |
1724 | (!is_io && (all_err_mask & ~AC_ERR_DEV))) | |
4528e4da | 1725 | ehc->i.action |= ATA_EH_REVALIDATE; |
022bdb07 | 1726 | |
dfcc173d TH |
1727 | /* If we have offending qcs and the associated failed device, |
1728 | * perform per-dev EH action only on the offending device. | |
1729 | */ | |
4528e4da | 1730 | if (ehc->i.dev) { |
4528e4da TH |
1731 | ehc->i.dev_action[ehc->i.dev->devno] |= |
1732 | ehc->i.action & ATA_EH_PERDEV_MASK; | |
1733 | ehc->i.action &= ~ATA_EH_PERDEV_MASK; | |
47005f25 TH |
1734 | } |
1735 | ||
dfcc173d TH |
1736 | /* consider speeding down */ |
1737 | dev = ehc->i.dev; | |
1738 | if (!dev && ata_link_max_devices(link) == 1 && | |
1739 | ata_dev_enabled(link->device)) | |
1740 | dev = link->device; | |
1741 | ||
1742 | if (dev) | |
1743 | ehc->i.action |= ata_eh_speed_down(dev, is_io, all_err_mask); | |
1744 | ||
022bdb07 TH |
1745 | DPRINTK("EXIT\n"); |
1746 | } | |
1747 | ||
1748 | /** | |
9b1e2658 TH |
1749 | * ata_eh_autopsy - analyze error and determine recovery action |
1750 | * @ap: host port to perform autopsy on | |
1751 | * | |
1752 | * Analyze all links of @ap and determine why they failed and | |
1753 | * which recovery actions are needed. | |
1754 | * | |
1755 | * LOCKING: | |
1756 | * Kernel thread context (may sleep). | |
1757 | */ | |
fb7fd614 | 1758 | void ata_eh_autopsy(struct ata_port *ap) |
9b1e2658 TH |
1759 | { |
1760 | struct ata_link *link; | |
1761 | ||
1762 | __ata_port_for_each_link(link, ap) | |
1763 | ata_eh_link_autopsy(link); | |
1764 | } | |
1765 | ||
1766 | /** | |
1767 | * ata_eh_link_report - report error handling to user | |
0260731f | 1768 | * @link: ATA link EH is going on |
022bdb07 TH |
1769 | * |
1770 | * Report EH to user. | |
1771 | * | |
1772 | * LOCKING: | |
1773 | * None. | |
1774 | */ | |
9b1e2658 | 1775 | static void ata_eh_link_report(struct ata_link *link) |
022bdb07 | 1776 | { |
0260731f TH |
1777 | struct ata_port *ap = link->ap; |
1778 | struct ata_eh_context *ehc = &link->eh_context; | |
022bdb07 | 1779 | const char *frozen, *desc; |
a1e10f7e | 1780 | char tries_buf[6]; |
022bdb07 TH |
1781 | int tag, nr_failed = 0; |
1782 | ||
94ff3d54 TH |
1783 | if (ehc->i.flags & ATA_EHI_QUIET) |
1784 | return; | |
1785 | ||
022bdb07 TH |
1786 | desc = NULL; |
1787 | if (ehc->i.desc[0] != '\0') | |
1788 | desc = ehc->i.desc; | |
1789 | ||
1790 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
1791 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
1792 | ||
e027bd36 TH |
1793 | if (!(qc->flags & ATA_QCFLAG_FAILED) || qc->dev->link != link || |
1794 | ((qc->flags & ATA_QCFLAG_QUIET) && | |
1795 | qc->err_mask == AC_ERR_DEV)) | |
022bdb07 TH |
1796 | continue; |
1797 | if (qc->flags & ATA_QCFLAG_SENSE_VALID && !qc->err_mask) | |
1798 | continue; | |
1799 | ||
1800 | nr_failed++; | |
1801 | } | |
1802 | ||
1803 | if (!nr_failed && !ehc->i.err_mask) | |
1804 | return; | |
1805 | ||
1806 | frozen = ""; | |
b51e9e5d | 1807 | if (ap->pflags & ATA_PFLAG_FROZEN) |
022bdb07 TH |
1808 | frozen = " frozen"; |
1809 | ||
a1e10f7e TH |
1810 | memset(tries_buf, 0, sizeof(tries_buf)); |
1811 | if (ap->eh_tries < ATA_EH_MAX_TRIES) | |
1812 | snprintf(tries_buf, sizeof(tries_buf) - 1, " t%d", | |
1813 | ap->eh_tries); | |
1814 | ||
022bdb07 | 1815 | if (ehc->i.dev) { |
e8ee8451 | 1816 | ata_dev_printk(ehc->i.dev, KERN_ERR, "exception Emask 0x%x " |
a1e10f7e TH |
1817 | "SAct 0x%x SErr 0x%x action 0x%x%s%s\n", |
1818 | ehc->i.err_mask, link->sactive, ehc->i.serror, | |
1819 | ehc->i.action, frozen, tries_buf); | |
022bdb07 | 1820 | if (desc) |
b64bbc39 | 1821 | ata_dev_printk(ehc->i.dev, KERN_ERR, "%s\n", desc); |
022bdb07 | 1822 | } else { |
0260731f | 1823 | ata_link_printk(link, KERN_ERR, "exception Emask 0x%x " |
a1e10f7e TH |
1824 | "SAct 0x%x SErr 0x%x action 0x%x%s%s\n", |
1825 | ehc->i.err_mask, link->sactive, ehc->i.serror, | |
1826 | ehc->i.action, frozen, tries_buf); | |
022bdb07 | 1827 | if (desc) |
0260731f | 1828 | ata_link_printk(link, KERN_ERR, "%s\n", desc); |
022bdb07 TH |
1829 | } |
1830 | ||
1333e194 RH |
1831 | if (ehc->i.serror) |
1832 | ata_port_printk(ap, KERN_ERR, | |
1833 | "SError: { %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s}\n", | |
1834 | ehc->i.serror & SERR_DATA_RECOVERED ? "RecovData " : "", | |
1835 | ehc->i.serror & SERR_COMM_RECOVERED ? "RecovComm " : "", | |
1836 | ehc->i.serror & SERR_DATA ? "UnrecovData " : "", | |
1837 | ehc->i.serror & SERR_PERSISTENT ? "Persist " : "", | |
1838 | ehc->i.serror & SERR_PROTOCOL ? "Proto " : "", | |
1839 | ehc->i.serror & SERR_INTERNAL ? "HostInt " : "", | |
1840 | ehc->i.serror & SERR_PHYRDY_CHG ? "PHYRdyChg " : "", | |
1841 | ehc->i.serror & SERR_PHY_INT_ERR ? "PHYInt " : "", | |
1842 | ehc->i.serror & SERR_COMM_WAKE ? "CommWake " : "", | |
1843 | ehc->i.serror & SERR_10B_8B_ERR ? "10B8B " : "", | |
1844 | ehc->i.serror & SERR_DISPARITY ? "Dispar " : "", | |
1845 | ehc->i.serror & SERR_CRC ? "BadCRC " : "", | |
1846 | ehc->i.serror & SERR_HANDSHAKE ? "Handshk " : "", | |
1847 | ehc->i.serror & SERR_LINK_SEQ_ERR ? "LinkSeq " : "", | |
1848 | ehc->i.serror & SERR_TRANS_ST_ERROR ? "TrStaTrns " : "", | |
1849 | ehc->i.serror & SERR_UNRECOG_FIS ? "UnrecFIS " : "", | |
2dcb407e | 1850 | ehc->i.serror & SERR_DEV_XCHG ? "DevExch " : ""); |
1333e194 | 1851 | |
022bdb07 | 1852 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { |
8a937581 TH |
1853 | static const char *dma_str[] = { |
1854 | [DMA_BIDIRECTIONAL] = "bidi", | |
1855 | [DMA_TO_DEVICE] = "out", | |
1856 | [DMA_FROM_DEVICE] = "in", | |
1857 | [DMA_NONE] = "", | |
1858 | }; | |
022bdb07 | 1859 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); |
8a937581 | 1860 | struct ata_taskfile *cmd = &qc->tf, *res = &qc->result_tf; |
022bdb07 | 1861 | |
0260731f TH |
1862 | if (!(qc->flags & ATA_QCFLAG_FAILED) || |
1863 | qc->dev->link != link || !qc->err_mask) | |
022bdb07 TH |
1864 | continue; |
1865 | ||
8a937581 TH |
1866 | ata_dev_printk(qc->dev, KERN_ERR, |
1867 | "cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x " | |
664e8503 | 1868 | "tag %d cdb 0x%x data %u %s\n " |
8a937581 | 1869 | "res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x " |
5335b729 | 1870 | "Emask 0x%x (%s)%s\n", |
8a937581 TH |
1871 | cmd->command, cmd->feature, cmd->nsect, |
1872 | cmd->lbal, cmd->lbam, cmd->lbah, | |
1873 | cmd->hob_feature, cmd->hob_nsect, | |
1874 | cmd->hob_lbal, cmd->hob_lbam, cmd->hob_lbah, | |
726f0785 | 1875 | cmd->device, qc->tag, qc->cdb[0], qc->nbytes, |
664e8503 | 1876 | dma_str[qc->dma_dir], |
8a937581 TH |
1877 | res->command, res->feature, res->nsect, |
1878 | res->lbal, res->lbam, res->lbah, | |
1879 | res->hob_feature, res->hob_nsect, | |
1880 | res->hob_lbal, res->hob_lbam, res->hob_lbah, | |
5335b729 TH |
1881 | res->device, qc->err_mask, ata_err_string(qc->err_mask), |
1882 | qc->err_mask & AC_ERR_NCQ ? " <F>" : ""); | |
1333e194 RH |
1883 | |
1884 | if (res->command & (ATA_BUSY | ATA_DRDY | ATA_DF | ATA_DRQ | | |
2dcb407e | 1885 | ATA_ERR)) { |
1333e194 RH |
1886 | if (res->command & ATA_BUSY) |
1887 | ata_dev_printk(qc->dev, KERN_ERR, | |
2dcb407e | 1888 | "status: { Busy }\n"); |
1333e194 RH |
1889 | else |
1890 | ata_dev_printk(qc->dev, KERN_ERR, | |
1891 | "status: { %s%s%s%s}\n", | |
1892 | res->command & ATA_DRDY ? "DRDY " : "", | |
1893 | res->command & ATA_DF ? "DF " : "", | |
1894 | res->command & ATA_DRQ ? "DRQ " : "", | |
2dcb407e | 1895 | res->command & ATA_ERR ? "ERR " : ""); |
1333e194 RH |
1896 | } |
1897 | ||
1898 | if (cmd->command != ATA_CMD_PACKET && | |
1899 | (res->feature & (ATA_ICRC | ATA_UNC | ATA_IDNF | | |
1900 | ATA_ABORTED))) | |
1901 | ata_dev_printk(qc->dev, KERN_ERR, | |
1902 | "error: { %s%s%s%s}\n", | |
1903 | res->feature & ATA_ICRC ? "ICRC " : "", | |
1904 | res->feature & ATA_UNC ? "UNC " : "", | |
1905 | res->feature & ATA_IDNF ? "IDNF " : "", | |
2dcb407e | 1906 | res->feature & ATA_ABORTED ? "ABRT " : ""); |
022bdb07 TH |
1907 | } |
1908 | } | |
1909 | ||
9b1e2658 TH |
1910 | /** |
1911 | * ata_eh_report - report error handling to user | |
1912 | * @ap: ATA port to report EH about | |
1913 | * | |
1914 | * Report EH to user. | |
1915 | * | |
1916 | * LOCKING: | |
1917 | * None. | |
1918 | */ | |
fb7fd614 | 1919 | void ata_eh_report(struct ata_port *ap) |
9b1e2658 TH |
1920 | { |
1921 | struct ata_link *link; | |
1922 | ||
1923 | __ata_port_for_each_link(link, ap) | |
1924 | ata_eh_link_report(link); | |
1925 | } | |
1926 | ||
cc0680a5 | 1927 | static int ata_do_reset(struct ata_link *link, ata_reset_fn_t reset, |
d4b2bab4 | 1928 | unsigned int *classes, unsigned long deadline) |
d87fa38e | 1929 | { |
f58229f8 TH |
1930 | struct ata_device *dev; |
1931 | int rc; | |
d87fa38e | 1932 | |
cc0680a5 | 1933 | ata_link_for_each_dev(dev, link) |
f58229f8 | 1934 | classes[dev->devno] = ATA_DEV_UNKNOWN; |
d87fa38e | 1935 | |
cc0680a5 | 1936 | rc = reset(link, classes, deadline); |
d87fa38e TH |
1937 | if (rc) |
1938 | return rc; | |
1939 | ||
1940 | /* If any class isn't ATA_DEV_UNKNOWN, consider classification | |
1941 | * is complete and convert all ATA_DEV_UNKNOWN to | |
1942 | * ATA_DEV_NONE. | |
1943 | */ | |
cc0680a5 | 1944 | ata_link_for_each_dev(dev, link) |
f58229f8 | 1945 | if (classes[dev->devno] != ATA_DEV_UNKNOWN) |
d87fa38e TH |
1946 | break; |
1947 | ||
f58229f8 | 1948 | if (dev) { |
cc0680a5 | 1949 | ata_link_for_each_dev(dev, link) { |
f58229f8 TH |
1950 | if (classes[dev->devno] == ATA_DEV_UNKNOWN) |
1951 | classes[dev->devno] = ATA_DEV_NONE; | |
1952 | } | |
1953 | } | |
d87fa38e TH |
1954 | |
1955 | return 0; | |
1956 | } | |
1957 | ||
ae791c05 TH |
1958 | static int ata_eh_followup_srst_needed(struct ata_link *link, |
1959 | int rc, int classify, | |
664faf09 TH |
1960 | const unsigned int *classes) |
1961 | { | |
ae791c05 TH |
1962 | if (link->flags & ATA_LFLAG_NO_SRST) |
1963 | return 0; | |
664faf09 TH |
1964 | if (rc == -EAGAIN) |
1965 | return 1; | |
1966 | if (rc != 0) | |
1967 | return 0; | |
3495de73 TH |
1968 | if ((link->ap->flags & ATA_FLAG_PMP) && ata_is_host_link(link)) |
1969 | return 1; | |
ae791c05 TH |
1970 | if (classify && !(link->flags & ATA_LFLAG_ASSUME_CLASS) && |
1971 | classes[0] == ATA_DEV_UNKNOWN) | |
664faf09 TH |
1972 | return 1; |
1973 | return 0; | |
1974 | } | |
1975 | ||
fb7fd614 TH |
1976 | int ata_eh_reset(struct ata_link *link, int classify, |
1977 | ata_prereset_fn_t prereset, ata_reset_fn_t softreset, | |
1978 | ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) | |
022bdb07 | 1979 | { |
416dc9ed | 1980 | const int max_tries = ARRAY_SIZE(ata_eh_reset_timeouts); |
afaa5c37 | 1981 | struct ata_port *ap = link->ap; |
936fd732 | 1982 | struct ata_eh_context *ehc = &link->eh_context; |
664faf09 | 1983 | unsigned int *classes = ehc->classes; |
416dc9ed | 1984 | unsigned int lflags = link->flags; |
1cdaf534 | 1985 | int verbose = !(ehc->i.flags & ATA_EHI_QUIET); |
31daabda | 1986 | int try = 0; |
f58229f8 | 1987 | struct ata_device *dev; |
416dc9ed | 1988 | unsigned long deadline, now; |
0e06d9ce | 1989 | unsigned int tmp_action; |
022bdb07 | 1990 | ata_reset_fn_t reset; |
afaa5c37 | 1991 | unsigned long flags; |
416dc9ed | 1992 | u32 sstatus; |
f58229f8 | 1993 | int rc; |
022bdb07 | 1994 | |
13abf50d | 1995 | /* about to reset */ |
afaa5c37 TH |
1996 | spin_lock_irqsave(ap->lock, flags); |
1997 | ap->pflags |= ATA_PFLAG_RESETTING; | |
1998 | spin_unlock_irqrestore(ap->lock, flags); | |
1999 | ||
955e57df | 2000 | ata_eh_about_to_do(link, NULL, ehc->i.action & ATA_EH_RESET_MASK); |
13abf50d | 2001 | |
cdeab114 TH |
2002 | ata_link_for_each_dev(dev, link) { |
2003 | /* If we issue an SRST then an ATA drive (not ATAPI) | |
2004 | * may change configuration and be in PIO0 timing. If | |
2005 | * we do a hard reset (or are coming from power on) | |
2006 | * this is true for ATA or ATAPI. Until we've set a | |
2007 | * suitable controller mode we should not touch the | |
2008 | * bus as we may be talking too fast. | |
2009 | */ | |
2010 | dev->pio_mode = XFER_PIO_0; | |
2011 | ||
2012 | /* If the controller has a pio mode setup function | |
2013 | * then use it to set the chipset to rights. Don't | |
2014 | * touch the DMA setup as that will be dealt with when | |
2015 | * configuring devices. | |
2016 | */ | |
2017 | if (ap->ops->set_piomode) | |
2018 | ap->ops->set_piomode(ap, dev); | |
2019 | } | |
2020 | ||
f5914a46 TH |
2021 | /* Determine which reset to use and record in ehc->i.action. |
2022 | * prereset() may examine and modify it. | |
2023 | */ | |
416dc9ed | 2024 | if (softreset && (!hardreset || (!(lflags & ATA_LFLAG_NO_SRST) && |
ae791c05 | 2025 | !sata_set_spd_needed(link) && |
0e06d9ce TH |
2026 | !(ehc->i.action & ATA_EH_HARDRESET)))) |
2027 | tmp_action = ATA_EH_SOFTRESET; | |
022bdb07 | 2028 | else |
0e06d9ce TH |
2029 | tmp_action = ATA_EH_HARDRESET; |
2030 | ||
2031 | ehc->i.action = (ehc->i.action & ~ATA_EH_RESET_MASK) | tmp_action; | |
f5914a46 TH |
2032 | |
2033 | if (prereset) { | |
cc0680a5 | 2034 | rc = prereset(link, jiffies + ATA_EH_PRERESET_TIMEOUT); |
f5914a46 | 2035 | if (rc) { |
c961922b | 2036 | if (rc == -ENOENT) { |
cc0680a5 | 2037 | ata_link_printk(link, KERN_DEBUG, |
4aa9ab67 | 2038 | "port disabled. ignoring.\n"); |
9af5c9c9 | 2039 | ehc->i.action &= ~ATA_EH_RESET_MASK; |
4aa9ab67 | 2040 | |
936fd732 | 2041 | ata_link_for_each_dev(dev, link) |
f58229f8 | 2042 | classes[dev->devno] = ATA_DEV_NONE; |
4aa9ab67 TH |
2043 | |
2044 | rc = 0; | |
c961922b | 2045 | } else |
cc0680a5 | 2046 | ata_link_printk(link, KERN_ERR, |
f5914a46 | 2047 | "prereset failed (errno=%d)\n", rc); |
fccb6ea5 | 2048 | goto out; |
f5914a46 TH |
2049 | } |
2050 | } | |
2051 | ||
2052 | /* prereset() might have modified ehc->i.action */ | |
2053 | if (ehc->i.action & ATA_EH_HARDRESET) | |
022bdb07 | 2054 | reset = hardreset; |
f5914a46 TH |
2055 | else if (ehc->i.action & ATA_EH_SOFTRESET) |
2056 | reset = softreset; | |
2057 | else { | |
2058 | /* prereset told us not to reset, bang classes and return */ | |
936fd732 | 2059 | ata_link_for_each_dev(dev, link) |
f58229f8 | 2060 | classes[dev->devno] = ATA_DEV_NONE; |
fccb6ea5 TH |
2061 | rc = 0; |
2062 | goto out; | |
f5914a46 TH |
2063 | } |
2064 | ||
2065 | /* did prereset() screw up? if so, fix up to avoid oopsing */ | |
2066 | if (!reset) { | |
f5914a46 TH |
2067 | if (softreset) |
2068 | reset = softreset; | |
2069 | else | |
2070 | reset = hardreset; | |
2071 | } | |
022bdb07 TH |
2072 | |
2073 | retry: | |
31daabda TH |
2074 | deadline = jiffies + ata_eh_reset_timeouts[try++]; |
2075 | ||
3e706399 TH |
2076 | /* shut up during boot probing */ |
2077 | if (verbose) | |
cc0680a5 | 2078 | ata_link_printk(link, KERN_INFO, "%s resetting link\n", |
3e706399 | 2079 | reset == softreset ? "soft" : "hard"); |
022bdb07 | 2080 | |
13abf50d | 2081 | /* mark that this EH session started with reset */ |
0d64a233 TH |
2082 | if (reset == hardreset) |
2083 | ehc->i.flags |= ATA_EHI_DID_HARDRESET; | |
2084 | else | |
2085 | ehc->i.flags |= ATA_EHI_DID_SOFTRESET; | |
022bdb07 | 2086 | |
cc0680a5 | 2087 | rc = ata_do_reset(link, reset, classes, deadline); |
022bdb07 | 2088 | |
664faf09 | 2089 | if (reset == hardreset && |
ae791c05 | 2090 | ata_eh_followup_srst_needed(link, rc, classify, classes)) { |
664faf09 | 2091 | /* okay, let's do follow-up softreset */ |
664faf09 TH |
2092 | reset = softreset; |
2093 | ||
2094 | if (!reset) { | |
cc0680a5 | 2095 | ata_link_printk(link, KERN_ERR, |
664faf09 TH |
2096 | "follow-up softreset required " |
2097 | "but no softreset avaliable\n"); | |
fccb6ea5 | 2098 | rc = -EINVAL; |
08cf69d0 | 2099 | goto fail; |
664faf09 TH |
2100 | } |
2101 | ||
955e57df | 2102 | ata_eh_about_to_do(link, NULL, ATA_EH_RESET_MASK); |
cc0680a5 | 2103 | rc = ata_do_reset(link, reset, classes, deadline); |
664faf09 TH |
2104 | } |
2105 | ||
416dc9ed TH |
2106 | /* -EAGAIN can happen if we skipped followup SRST */ |
2107 | if (rc && rc != -EAGAIN) | |
2108 | goto fail; | |
664faf09 | 2109 | |
08cf69d0 TH |
2110 | /* was classification successful? */ |
2111 | if (classify && classes[0] == ATA_DEV_UNKNOWN && | |
2112 | !(lflags & ATA_LFLAG_ASSUME_CLASS)) { | |
2113 | if (try < max_tries) { | |
2114 | ata_link_printk(link, KERN_WARNING, | |
2115 | "classification failed\n"); | |
2116 | rc = -EINVAL; | |
2117 | goto fail; | |
2118 | } | |
2119 | ||
2120 | ata_link_printk(link, KERN_WARNING, | |
2121 | "classfication failed, assuming ATA\n"); | |
2122 | lflags |= ATA_LFLAG_ASSUME_ATA; | |
2123 | } | |
2124 | ||
416dc9ed TH |
2125 | ata_link_for_each_dev(dev, link) { |
2126 | /* After the reset, the device state is PIO 0 and the | |
2127 | * controller state is undefined. Reset also wakes up | |
2128 | * drives from sleeping mode. | |
2129 | */ | |
2130 | dev->pio_mode = XFER_PIO_0; | |
2131 | dev->flags &= ~ATA_DFLAG_SLEEPING; | |
31daabda | 2132 | |
416dc9ed TH |
2133 | if (ata_link_offline(link)) |
2134 | continue; | |
022bdb07 | 2135 | |
416dc9ed TH |
2136 | /* apply class override and convert UNKNOWN to NONE */ |
2137 | if (lflags & ATA_LFLAG_ASSUME_ATA) | |
2138 | classes[dev->devno] = ATA_DEV_ATA; | |
2139 | else if (lflags & ATA_LFLAG_ASSUME_SEMB) | |
2140 | classes[dev->devno] = ATA_DEV_SEMB_UNSUP; /* not yet */ | |
2141 | else if (classes[dev->devno] == ATA_DEV_UNKNOWN) | |
2142 | classes[dev->devno] = ATA_DEV_NONE; | |
022bdb07 TH |
2143 | } |
2144 | ||
416dc9ed TH |
2145 | /* record current link speed */ |
2146 | if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0) | |
2147 | link->sata_spd = (sstatus >> 4) & 0xf; | |
008a7896 | 2148 | |
416dc9ed TH |
2149 | if (postreset) |
2150 | postreset(link, classes); | |
20952b69 | 2151 | |
416dc9ed TH |
2152 | /* reset successful, schedule revalidation */ |
2153 | ata_eh_done(link, NULL, ehc->i.action & ATA_EH_RESET_MASK); | |
2154 | ehc->i.action |= ATA_EH_REVALIDATE; | |
ae791c05 | 2155 | |
416dc9ed | 2156 | rc = 0; |
fccb6ea5 TH |
2157 | out: |
2158 | /* clear hotplug flag */ | |
2159 | ehc->i.flags &= ~ATA_EHI_HOTPLUGGED; | |
afaa5c37 TH |
2160 | |
2161 | spin_lock_irqsave(ap->lock, flags); | |
2162 | ap->pflags &= ~ATA_PFLAG_RESETTING; | |
2163 | spin_unlock_irqrestore(ap->lock, flags); | |
2164 | ||
022bdb07 | 2165 | return rc; |
416dc9ed TH |
2166 | |
2167 | fail: | |
2168 | if (rc == -ERESTART || try >= max_tries) | |
2169 | goto out; | |
2170 | ||
2171 | now = jiffies; | |
2172 | if (time_before(now, deadline)) { | |
2173 | unsigned long delta = deadline - now; | |
2174 | ||
2175 | ata_link_printk(link, KERN_WARNING, "reset failed " | |
2176 | "(errno=%d), retrying in %u secs\n", | |
2177 | rc, (jiffies_to_msecs(delta) + 999) / 1000); | |
2178 | ||
2179 | while (delta) | |
2180 | delta = schedule_timeout_uninterruptible(delta); | |
2181 | } | |
2182 | ||
2183 | if (rc == -EPIPE || try == max_tries - 1) | |
2184 | sata_down_spd_limit(link); | |
2185 | if (hardreset) | |
2186 | reset = hardreset; | |
2187 | goto retry; | |
022bdb07 TH |
2188 | } |
2189 | ||
0260731f | 2190 | static int ata_eh_revalidate_and_attach(struct ata_link *link, |
084fe639 | 2191 | struct ata_device **r_failed_dev) |
022bdb07 | 2192 | { |
0260731f TH |
2193 | struct ata_port *ap = link->ap; |
2194 | struct ata_eh_context *ehc = &link->eh_context; | |
022bdb07 | 2195 | struct ata_device *dev; |
8c3c52a8 | 2196 | unsigned int new_mask = 0; |
084fe639 | 2197 | unsigned long flags; |
f58229f8 | 2198 | int rc = 0; |
022bdb07 TH |
2199 | |
2200 | DPRINTK("ENTER\n"); | |
2201 | ||
8c3c52a8 TH |
2202 | /* For PATA drive side cable detection to work, IDENTIFY must |
2203 | * be done backwards such that PDIAG- is released by the slave | |
2204 | * device before the master device is identified. | |
2205 | */ | |
0260731f | 2206 | ata_link_for_each_dev_reverse(dev, link) { |
f58229f8 TH |
2207 | unsigned int action = ata_eh_dev_action(dev); |
2208 | unsigned int readid_flags = 0; | |
022bdb07 | 2209 | |
bff04647 TH |
2210 | if (ehc->i.flags & ATA_EHI_DID_RESET) |
2211 | readid_flags |= ATA_READID_POSTRESET; | |
2212 | ||
9666f400 | 2213 | if ((action & ATA_EH_REVALIDATE) && ata_dev_enabled(dev)) { |
633273a3 TH |
2214 | WARN_ON(dev->class == ATA_DEV_PMP); |
2215 | ||
0260731f | 2216 | if (ata_link_offline(link)) { |
022bdb07 | 2217 | rc = -EIO; |
8c3c52a8 | 2218 | goto err; |
022bdb07 TH |
2219 | } |
2220 | ||
0260731f | 2221 | ata_eh_about_to_do(link, dev, ATA_EH_REVALIDATE); |
422c9daa TH |
2222 | rc = ata_dev_revalidate(dev, ehc->classes[dev->devno], |
2223 | readid_flags); | |
022bdb07 | 2224 | if (rc) |
8c3c52a8 | 2225 | goto err; |
022bdb07 | 2226 | |
0260731f | 2227 | ata_eh_done(link, dev, ATA_EH_REVALIDATE); |
47005f25 | 2228 | |
baa1e78a TH |
2229 | /* Configuration may have changed, reconfigure |
2230 | * transfer mode. | |
2231 | */ | |
2232 | ehc->i.flags |= ATA_EHI_SETMODE; | |
2233 | ||
3057ac3c | 2234 | /* schedule the scsi_rescan_device() here */ |
2235 | queue_work(ata_aux_wq, &(ap->scsi_rescan_task)); | |
084fe639 TH |
2236 | } else if (dev->class == ATA_DEV_UNKNOWN && |
2237 | ehc->tries[dev->devno] && | |
2238 | ata_class_enabled(ehc->classes[dev->devno])) { | |
2239 | dev->class = ehc->classes[dev->devno]; | |
2240 | ||
633273a3 TH |
2241 | if (dev->class == ATA_DEV_PMP) |
2242 | rc = sata_pmp_attach(dev); | |
2243 | else | |
2244 | rc = ata_dev_read_id(dev, &dev->class, | |
2245 | readid_flags, dev->id); | |
8c3c52a8 TH |
2246 | switch (rc) { |
2247 | case 0: | |
f58229f8 | 2248 | new_mask |= 1 << dev->devno; |
8c3c52a8 TH |
2249 | break; |
2250 | case -ENOENT: | |
55a8e2c8 TH |
2251 | /* IDENTIFY was issued to non-existent |
2252 | * device. No need to reset. Just | |
2253 | * thaw and kill the device. | |
2254 | */ | |
2255 | ata_eh_thaw_port(ap); | |
084fe639 TH |
2256 | dev->class = ATA_DEV_UNKNOWN; |
2257 | break; | |
8c3c52a8 TH |
2258 | default: |
2259 | dev->class = ATA_DEV_UNKNOWN; | |
2260 | goto err; | |
084fe639 | 2261 | } |
8c3c52a8 TH |
2262 | } |
2263 | } | |
084fe639 | 2264 | |
c1c4e8d5 | 2265 | /* PDIAG- should have been released, ask cable type if post-reset */ |
9b1e2658 TH |
2266 | if (ata_is_host_link(link) && ap->ops->cable_detect && |
2267 | (ehc->i.flags & ATA_EHI_DID_RESET)) | |
c1c4e8d5 TH |
2268 | ap->cbl = ap->ops->cable_detect(ap); |
2269 | ||
8c3c52a8 TH |
2270 | /* Configure new devices forward such that user doesn't see |
2271 | * device detection messages backwards. | |
2272 | */ | |
0260731f | 2273 | ata_link_for_each_dev(dev, link) { |
633273a3 TH |
2274 | if (!(new_mask & (1 << dev->devno)) || |
2275 | dev->class == ATA_DEV_PMP) | |
8c3c52a8 TH |
2276 | continue; |
2277 | ||
2278 | ehc->i.flags |= ATA_EHI_PRINTINFO; | |
2279 | rc = ata_dev_configure(dev); | |
2280 | ehc->i.flags &= ~ATA_EHI_PRINTINFO; | |
2281 | if (rc) | |
2282 | goto err; | |
2283 | ||
2284 | spin_lock_irqsave(ap->lock, flags); | |
2285 | ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG; | |
2286 | spin_unlock_irqrestore(ap->lock, flags); | |
2287 | ||
2288 | /* new device discovered, configure xfermode */ | |
2289 | ehc->i.flags |= ATA_EHI_SETMODE; | |
022bdb07 TH |
2290 | } |
2291 | ||
8c3c52a8 | 2292 | return 0; |
022bdb07 | 2293 | |
8c3c52a8 TH |
2294 | err: |
2295 | *r_failed_dev = dev; | |
2296 | DPRINTK("EXIT rc=%d\n", rc); | |
022bdb07 TH |
2297 | return rc; |
2298 | } | |
2299 | ||
0260731f | 2300 | static int ata_link_nr_enabled(struct ata_link *link) |
022bdb07 | 2301 | { |
f58229f8 TH |
2302 | struct ata_device *dev; |
2303 | int cnt = 0; | |
022bdb07 | 2304 | |
0260731f | 2305 | ata_link_for_each_dev(dev, link) |
f58229f8 | 2306 | if (ata_dev_enabled(dev)) |
022bdb07 TH |
2307 | cnt++; |
2308 | return cnt; | |
2309 | } | |
2310 | ||
0260731f | 2311 | static int ata_link_nr_vacant(struct ata_link *link) |
084fe639 | 2312 | { |
f58229f8 TH |
2313 | struct ata_device *dev; |
2314 | int cnt = 0; | |
084fe639 | 2315 | |
0260731f | 2316 | ata_link_for_each_dev(dev, link) |
f58229f8 | 2317 | if (dev->class == ATA_DEV_UNKNOWN) |
084fe639 TH |
2318 | cnt++; |
2319 | return cnt; | |
2320 | } | |
2321 | ||
0260731f | 2322 | static int ata_eh_skip_recovery(struct ata_link *link) |
084fe639 | 2323 | { |
0260731f | 2324 | struct ata_eh_context *ehc = &link->eh_context; |
f58229f8 | 2325 | struct ata_device *dev; |
084fe639 | 2326 | |
f9df58cb TH |
2327 | /* skip disabled links */ |
2328 | if (link->flags & ATA_LFLAG_DISABLED) | |
2329 | return 1; | |
2330 | ||
7c8c2cff | 2331 | /* thaw frozen port, resume link and recover failed devices */ |
0260731f TH |
2332 | if ((link->ap->pflags & ATA_PFLAG_FROZEN) || |
2333 | (ehc->i.flags & ATA_EHI_RESUME_LINK) || ata_link_nr_enabled(link)) | |
084fe639 TH |
2334 | return 0; |
2335 | ||
2336 | /* skip if class codes for all vacant slots are ATA_DEV_NONE */ | |
0260731f | 2337 | ata_link_for_each_dev(dev, link) { |
084fe639 TH |
2338 | if (dev->class == ATA_DEV_UNKNOWN && |
2339 | ehc->classes[dev->devno] != ATA_DEV_NONE) | |
2340 | return 0; | |
2341 | } | |
2342 | ||
2343 | return 1; | |
2344 | } | |
2345 | ||
9b1e2658 | 2346 | static int ata_eh_handle_dev_fail(struct ata_device *dev, int err) |
fee7ca72 | 2347 | { |
9af5c9c9 | 2348 | struct ata_eh_context *ehc = &dev->link->eh_context; |
fee7ca72 TH |
2349 | |
2350 | ehc->tries[dev->devno]--; | |
2351 | ||
2352 | switch (err) { | |
2353 | case -ENODEV: | |
2354 | /* device missing or wrong IDENTIFY data, schedule probing */ | |
2355 | ehc->i.probe_mask |= (1 << dev->devno); | |
2356 | case -EINVAL: | |
2357 | /* give it just one more chance */ | |
2358 | ehc->tries[dev->devno] = min(ehc->tries[dev->devno], 1); | |
2359 | case -EIO: | |
4fb4615b | 2360 | if (ehc->tries[dev->devno] == 1 && dev->pio_mode > XFER_PIO_0) { |
fee7ca72 TH |
2361 | /* This is the last chance, better to slow |
2362 | * down than lose it. | |
2363 | */ | |
936fd732 | 2364 | sata_down_spd_limit(dev->link); |
fee7ca72 TH |
2365 | ata_down_xfermask_limit(dev, ATA_DNXFER_PIO); |
2366 | } | |
2367 | } | |
2368 | ||
2369 | if (ata_dev_enabled(dev) && !ehc->tries[dev->devno]) { | |
2370 | /* disable device if it has used up all its chances */ | |
2371 | ata_dev_disable(dev); | |
2372 | ||
2373 | /* detach if offline */ | |
936fd732 | 2374 | if (ata_link_offline(dev->link)) |
fee7ca72 TH |
2375 | ata_eh_detach_dev(dev); |
2376 | ||
2377 | /* probe if requested */ | |
2378 | if ((ehc->i.probe_mask & (1 << dev->devno)) && | |
2379 | !(ehc->did_probe_mask & (1 << dev->devno))) { | |
2380 | ata_eh_detach_dev(dev); | |
2381 | ata_dev_init(dev); | |
2382 | ||
2383 | ehc->tries[dev->devno] = ATA_EH_DEV_TRIES; | |
2384 | ehc->did_probe_mask |= (1 << dev->devno); | |
2385 | ehc->i.action |= ATA_EH_SOFTRESET; | |
2386 | } | |
9b1e2658 TH |
2387 | |
2388 | return 1; | |
fee7ca72 TH |
2389 | } else { |
2390 | /* soft didn't work? be haaaaard */ | |
2391 | if (ehc->i.flags & ATA_EHI_DID_RESET) | |
2392 | ehc->i.action |= ATA_EH_HARDRESET; | |
2393 | else | |
2394 | ehc->i.action |= ATA_EH_SOFTRESET; | |
9b1e2658 TH |
2395 | |
2396 | return 0; | |
fee7ca72 TH |
2397 | } |
2398 | } | |
2399 | ||
022bdb07 TH |
2400 | /** |
2401 | * ata_eh_recover - recover host port after error | |
2402 | * @ap: host port to recover | |
f5914a46 | 2403 | * @prereset: prereset method (can be NULL) |
022bdb07 TH |
2404 | * @softreset: softreset method (can be NULL) |
2405 | * @hardreset: hardreset method (can be NULL) | |
2406 | * @postreset: postreset method (can be NULL) | |
9b1e2658 | 2407 | * @r_failed_link: out parameter for failed link |
022bdb07 TH |
2408 | * |
2409 | * This is the alpha and omega, eum and yang, heart and soul of | |
2410 | * libata exception handling. On entry, actions required to | |
9b1e2658 TH |
2411 | * recover each link and hotplug requests are recorded in the |
2412 | * link's eh_context. This function executes all the operations | |
2413 | * with appropriate retrials and fallbacks to resurrect failed | |
084fe639 | 2414 | * devices, detach goners and greet newcomers. |
022bdb07 TH |
2415 | * |
2416 | * LOCKING: | |
2417 | * Kernel thread context (may sleep). | |
2418 | * | |
2419 | * RETURNS: | |
2420 | * 0 on success, -errno on failure. | |
2421 | */ | |
fb7fd614 TH |
2422 | int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset, |
2423 | ata_reset_fn_t softreset, ata_reset_fn_t hardreset, | |
2424 | ata_postreset_fn_t postreset, | |
2425 | struct ata_link **r_failed_link) | |
022bdb07 | 2426 | { |
9b1e2658 | 2427 | struct ata_link *link; |
022bdb07 | 2428 | struct ata_device *dev; |
9b1e2658 TH |
2429 | int nr_failed_devs, nr_disabled_devs; |
2430 | int reset, rc; | |
f9df58cb | 2431 | unsigned long flags; |
022bdb07 TH |
2432 | |
2433 | DPRINTK("ENTER\n"); | |
2434 | ||
2435 | /* prep for recovery */ | |
9b1e2658 TH |
2436 | ata_port_for_each_link(link, ap) { |
2437 | struct ata_eh_context *ehc = &link->eh_context; | |
084fe639 | 2438 | |
f9df58cb TH |
2439 | /* re-enable link? */ |
2440 | if (ehc->i.action & ATA_EH_ENABLE_LINK) { | |
2441 | ata_eh_about_to_do(link, NULL, ATA_EH_ENABLE_LINK); | |
2442 | spin_lock_irqsave(ap->lock, flags); | |
2443 | link->flags &= ~ATA_LFLAG_DISABLED; | |
2444 | spin_unlock_irqrestore(ap->lock, flags); | |
2445 | ata_eh_done(link, NULL, ATA_EH_ENABLE_LINK); | |
2446 | } | |
2447 | ||
9b1e2658 | 2448 | ata_link_for_each_dev(dev, link) { |
fd995f70 TH |
2449 | if (link->flags & ATA_LFLAG_NO_RETRY) |
2450 | ehc->tries[dev->devno] = 1; | |
2451 | else | |
2452 | ehc->tries[dev->devno] = ATA_EH_DEV_TRIES; | |
084fe639 | 2453 | |
9b1e2658 TH |
2454 | /* collect port action mask recorded in dev actions */ |
2455 | ehc->i.action |= ehc->i.dev_action[dev->devno] & | |
2456 | ~ATA_EH_PERDEV_MASK; | |
2457 | ehc->i.dev_action[dev->devno] &= ATA_EH_PERDEV_MASK; | |
2458 | ||
2459 | /* process hotplug request */ | |
2460 | if (dev->flags & ATA_DFLAG_DETACH) | |
2461 | ata_eh_detach_dev(dev); | |
2462 | ||
2463 | if (!ata_dev_enabled(dev) && | |
2464 | ((ehc->i.probe_mask & (1 << dev->devno)) && | |
2465 | !(ehc->did_probe_mask & (1 << dev->devno)))) { | |
2466 | ata_eh_detach_dev(dev); | |
2467 | ata_dev_init(dev); | |
2468 | ehc->did_probe_mask |= (1 << dev->devno); | |
2469 | ehc->i.action |= ATA_EH_SOFTRESET; | |
2470 | } | |
084fe639 | 2471 | } |
022bdb07 TH |
2472 | } |
2473 | ||
2474 | retry: | |
022bdb07 | 2475 | rc = 0; |
9b1e2658 TH |
2476 | nr_failed_devs = 0; |
2477 | nr_disabled_devs = 0; | |
2478 | reset = 0; | |
022bdb07 | 2479 | |
aeb2ecd6 | 2480 | /* if UNLOADING, finish immediately */ |
b51e9e5d | 2481 | if (ap->pflags & ATA_PFLAG_UNLOADING) |
aeb2ecd6 TH |
2482 | goto out; |
2483 | ||
9b1e2658 TH |
2484 | /* prep for EH */ |
2485 | ata_port_for_each_link(link, ap) { | |
2486 | struct ata_eh_context *ehc = &link->eh_context; | |
022bdb07 | 2487 | |
9b1e2658 TH |
2488 | /* skip EH if possible. */ |
2489 | if (ata_eh_skip_recovery(link)) | |
2490 | ehc->i.action = 0; | |
2491 | ||
2492 | /* do we need to reset? */ | |
2493 | if (ehc->i.action & ATA_EH_RESET_MASK) | |
2494 | reset = 1; | |
2495 | ||
2496 | ata_link_for_each_dev(dev, link) | |
2497 | ehc->classes[dev->devno] = ATA_DEV_UNKNOWN; | |
2498 | } | |
084fe639 | 2499 | |
022bdb07 | 2500 | /* reset */ |
9b1e2658 | 2501 | if (reset) { |
b06ce3e5 TH |
2502 | /* if PMP is attached, this function only deals with |
2503 | * downstream links, port should stay thawed. | |
2504 | */ | |
2505 | if (!ap->nr_pmp_links) | |
2506 | ata_eh_freeze_port(ap); | |
022bdb07 | 2507 | |
9b1e2658 TH |
2508 | ata_port_for_each_link(link, ap) { |
2509 | struct ata_eh_context *ehc = &link->eh_context; | |
2510 | ||
2511 | if (!(ehc->i.action & ATA_EH_RESET_MASK)) | |
2512 | continue; | |
2513 | ||
2514 | rc = ata_eh_reset(link, ata_link_nr_vacant(link), | |
2515 | prereset, softreset, hardreset, | |
2516 | postreset); | |
2517 | if (rc) { | |
2518 | ata_link_printk(link, KERN_ERR, | |
2519 | "reset failed, giving up\n"); | |
2520 | goto out; | |
2521 | } | |
022bdb07 TH |
2522 | } |
2523 | ||
b06ce3e5 TH |
2524 | if (!ap->nr_pmp_links) |
2525 | ata_eh_thaw_port(ap); | |
022bdb07 TH |
2526 | } |
2527 | ||
9b1e2658 TH |
2528 | /* the rest */ |
2529 | ata_port_for_each_link(link, ap) { | |
2530 | struct ata_eh_context *ehc = &link->eh_context; | |
022bdb07 | 2531 | |
9b1e2658 TH |
2532 | /* revalidate existing devices and attach new ones */ |
2533 | rc = ata_eh_revalidate_and_attach(link, &dev); | |
4ae72a1e | 2534 | if (rc) |
022bdb07 | 2535 | goto dev_fail; |
022bdb07 | 2536 | |
633273a3 TH |
2537 | /* if PMP got attached, return, pmp EH will take care of it */ |
2538 | if (link->device->class == ATA_DEV_PMP) { | |
2539 | ehc->i.action = 0; | |
2540 | return 0; | |
2541 | } | |
2542 | ||
9b1e2658 TH |
2543 | /* configure transfer mode if necessary */ |
2544 | if (ehc->i.flags & ATA_EHI_SETMODE) { | |
2545 | rc = ata_set_mode(link, &dev); | |
2546 | if (rc) | |
2547 | goto dev_fail; | |
2548 | ehc->i.flags &= ~ATA_EHI_SETMODE; | |
2549 | } | |
2550 | ||
ca77329f KCA |
2551 | if (ehc->i.action & ATA_EHI_LPM) |
2552 | ata_link_for_each_dev(dev, link) | |
2553 | ata_dev_enable_pm(dev, ap->pm_policy); | |
2554 | ||
9b1e2658 TH |
2555 | /* this link is okay now */ |
2556 | ehc->i.flags = 0; | |
2557 | continue; | |
022bdb07 | 2558 | |
2dcb407e | 2559 | dev_fail: |
9b1e2658 TH |
2560 | nr_failed_devs++; |
2561 | if (ata_eh_handle_dev_fail(dev, rc)) | |
2562 | nr_disabled_devs++; | |
022bdb07 | 2563 | |
b06ce3e5 TH |
2564 | if (ap->pflags & ATA_PFLAG_FROZEN) { |
2565 | /* PMP reset requires working host port. | |
2566 | * Can't retry if it's frozen. | |
2567 | */ | |
2568 | if (ap->nr_pmp_links) | |
2569 | goto out; | |
9b1e2658 | 2570 | break; |
b06ce3e5 | 2571 | } |
022bdb07 TH |
2572 | } |
2573 | ||
9b1e2658 TH |
2574 | if (nr_failed_devs) { |
2575 | if (nr_failed_devs != nr_disabled_devs) { | |
2576 | ata_port_printk(ap, KERN_WARNING, "failed to recover " | |
2577 | "some devices, retrying in 5 secs\n"); | |
2578 | ssleep(5); | |
2579 | } else { | |
2580 | /* no device left to recover, repeat fast */ | |
2581 | msleep(500); | |
2582 | } | |
022bdb07 | 2583 | |
9b1e2658 | 2584 | goto retry; |
022bdb07 TH |
2585 | } |
2586 | ||
9b1e2658 TH |
2587 | out: |
2588 | if (rc && r_failed_link) | |
2589 | *r_failed_link = link; | |
2590 | ||
022bdb07 TH |
2591 | DPRINTK("EXIT, rc=%d\n", rc); |
2592 | return rc; | |
2593 | } | |
2594 | ||
2595 | /** | |
2596 | * ata_eh_finish - finish up EH | |
2597 | * @ap: host port to finish EH for | |
2598 | * | |
2599 | * Recovery is complete. Clean up EH states and retry or finish | |
2600 | * failed qcs. | |
2601 | * | |
2602 | * LOCKING: | |
2603 | * None. | |
2604 | */ | |
fb7fd614 | 2605 | void ata_eh_finish(struct ata_port *ap) |
022bdb07 TH |
2606 | { |
2607 | int tag; | |
2608 | ||
2609 | /* retry or finish qcs */ | |
2610 | for (tag = 0; tag < ATA_MAX_QUEUE; tag++) { | |
2611 | struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag); | |
2612 | ||
2613 | if (!(qc->flags & ATA_QCFLAG_FAILED)) | |
2614 | continue; | |
2615 | ||
2616 | if (qc->err_mask) { | |
2617 | /* FIXME: Once EH migration is complete, | |
2618 | * generate sense data in this function, | |
2619 | * considering both err_mask and tf. | |
f90f0828 TH |
2620 | * |
2621 | * There's no point in retrying invalid | |
2622 | * (detected by libata) and non-IO device | |
2623 | * errors (rejected by device). Finish them | |
2624 | * immediately. | |
022bdb07 | 2625 | */ |
f90f0828 TH |
2626 | if ((qc->err_mask & AC_ERR_INVALID) || |
2627 | (!(qc->flags & ATA_QCFLAG_IO) && | |
2628 | qc->err_mask == AC_ERR_DEV)) | |
022bdb07 TH |
2629 | ata_eh_qc_complete(qc); |
2630 | else | |
2631 | ata_eh_qc_retry(qc); | |
2632 | } else { | |
2633 | if (qc->flags & ATA_QCFLAG_SENSE_VALID) { | |
2634 | ata_eh_qc_complete(qc); | |
2635 | } else { | |
2636 | /* feed zero TF to sense generation */ | |
2637 | memset(&qc->result_tf, 0, sizeof(qc->result_tf)); | |
2638 | ata_eh_qc_retry(qc); | |
2639 | } | |
2640 | } | |
2641 | } | |
da917d69 TH |
2642 | |
2643 | /* make sure nr_active_links is zero after EH */ | |
2644 | WARN_ON(ap->nr_active_links); | |
2645 | ap->nr_active_links = 0; | |
022bdb07 TH |
2646 | } |
2647 | ||
2648 | /** | |
2649 | * ata_do_eh - do standard error handling | |
2650 | * @ap: host port to handle error for | |
f5914a46 | 2651 | * @prereset: prereset method (can be NULL) |
022bdb07 TH |
2652 | * @softreset: softreset method (can be NULL) |
2653 | * @hardreset: hardreset method (can be NULL) | |
2654 | * @postreset: postreset method (can be NULL) | |
2655 | * | |
2656 | * Perform standard error handling sequence. | |
2657 | * | |
2658 | * LOCKING: | |
2659 | * Kernel thread context (may sleep). | |
2660 | */ | |
f5914a46 TH |
2661 | void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset, |
2662 | ata_reset_fn_t softreset, ata_reset_fn_t hardreset, | |
2663 | ata_postreset_fn_t postreset) | |
022bdb07 | 2664 | { |
9b1e2658 TH |
2665 | struct ata_device *dev; |
2666 | int rc; | |
2667 | ||
2668 | ata_eh_autopsy(ap); | |
2669 | ata_eh_report(ap); | |
2670 | ||
2671 | rc = ata_eh_recover(ap, prereset, softreset, hardreset, postreset, | |
2672 | NULL); | |
2673 | if (rc) { | |
2674 | ata_link_for_each_dev(dev, &ap->link) | |
2675 | ata_dev_disable(dev); | |
2676 | } | |
2677 | ||
022bdb07 TH |
2678 | ata_eh_finish(ap); |
2679 | } | |
500530f6 | 2680 | |
6ffa01d8 | 2681 | #ifdef CONFIG_PM |
500530f6 TH |
2682 | /** |
2683 | * ata_eh_handle_port_suspend - perform port suspend operation | |
2684 | * @ap: port to suspend | |
2685 | * | |
2686 | * Suspend @ap. | |
2687 | * | |
2688 | * LOCKING: | |
2689 | * Kernel thread context (may sleep). | |
2690 | */ | |
2691 | static void ata_eh_handle_port_suspend(struct ata_port *ap) | |
2692 | { | |
2693 | unsigned long flags; | |
2694 | int rc = 0; | |
2695 | ||
2696 | /* are we suspending? */ | |
2697 | spin_lock_irqsave(ap->lock, flags); | |
2698 | if (!(ap->pflags & ATA_PFLAG_PM_PENDING) || | |
2699 | ap->pm_mesg.event == PM_EVENT_ON) { | |
2700 | spin_unlock_irqrestore(ap->lock, flags); | |
2701 | return; | |
2702 | } | |
2703 | spin_unlock_irqrestore(ap->lock, flags); | |
2704 | ||
2705 | WARN_ON(ap->pflags & ATA_PFLAG_SUSPENDED); | |
2706 | ||
64578a3d TH |
2707 | /* tell ACPI we're suspending */ |
2708 | rc = ata_acpi_on_suspend(ap); | |
2709 | if (rc) | |
2710 | goto out; | |
2711 | ||
500530f6 TH |
2712 | /* suspend */ |
2713 | ata_eh_freeze_port(ap); | |
2714 | ||
2715 | if (ap->ops->port_suspend) | |
2716 | rc = ap->ops->port_suspend(ap, ap->pm_mesg); | |
2717 | ||
64578a3d | 2718 | out: |
500530f6 TH |
2719 | /* report result */ |
2720 | spin_lock_irqsave(ap->lock, flags); | |
2721 | ||
2722 | ap->pflags &= ~ATA_PFLAG_PM_PENDING; | |
2723 | if (rc == 0) | |
2724 | ap->pflags |= ATA_PFLAG_SUSPENDED; | |
64578a3d | 2725 | else if (ap->pflags & ATA_PFLAG_FROZEN) |
500530f6 TH |
2726 | ata_port_schedule_eh(ap); |
2727 | ||
2728 | if (ap->pm_result) { | |
2729 | *ap->pm_result = rc; | |
2730 | ap->pm_result = NULL; | |
2731 | } | |
2732 | ||
2733 | spin_unlock_irqrestore(ap->lock, flags); | |
2734 | ||
2735 | return; | |
2736 | } | |
2737 | ||
2738 | /** | |
2739 | * ata_eh_handle_port_resume - perform port resume operation | |
2740 | * @ap: port to resume | |
2741 | * | |
2742 | * Resume @ap. | |
2743 | * | |
500530f6 TH |
2744 | * LOCKING: |
2745 | * Kernel thread context (may sleep). | |
2746 | */ | |
2747 | static void ata_eh_handle_port_resume(struct ata_port *ap) | |
2748 | { | |
500530f6 | 2749 | unsigned long flags; |
9666f400 | 2750 | int rc = 0; |
500530f6 TH |
2751 | |
2752 | /* are we resuming? */ | |
2753 | spin_lock_irqsave(ap->lock, flags); | |
2754 | if (!(ap->pflags & ATA_PFLAG_PM_PENDING) || | |
2755 | ap->pm_mesg.event != PM_EVENT_ON) { | |
2756 | spin_unlock_irqrestore(ap->lock, flags); | |
2757 | return; | |
2758 | } | |
2759 | spin_unlock_irqrestore(ap->lock, flags); | |
2760 | ||
9666f400 | 2761 | WARN_ON(!(ap->pflags & ATA_PFLAG_SUSPENDED)); |
500530f6 TH |
2762 | |
2763 | if (ap->ops->port_resume) | |
2764 | rc = ap->ops->port_resume(ap); | |
2765 | ||
6746544c TH |
2766 | /* tell ACPI that we're resuming */ |
2767 | ata_acpi_on_resume(ap); | |
2768 | ||
9666f400 | 2769 | /* report result */ |
500530f6 TH |
2770 | spin_lock_irqsave(ap->lock, flags); |
2771 | ap->pflags &= ~(ATA_PFLAG_PM_PENDING | ATA_PFLAG_SUSPENDED); | |
2772 | if (ap->pm_result) { | |
2773 | *ap->pm_result = rc; | |
2774 | ap->pm_result = NULL; | |
2775 | } | |
2776 | spin_unlock_irqrestore(ap->lock, flags); | |
2777 | } | |
6ffa01d8 | 2778 | #endif /* CONFIG_PM */ |