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Tejun Heoece1d632006-04-02 18:51:53 +09001/*
2 * libata-eh.c - libata error handling
3 *
Tejun Heo8c3d3d42013-05-14 11:09:50 -07004 * Maintained by: Tejun Heo <tj@kernel.org>
Tejun Heoece1d632006-04-02 18:51:53 +09005 * 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
Tejun Heoece1d632006-04-02 18:51:53 +090035#include <linux/kernel.h>
Jens Axboe242f9dc2008-09-14 05:55:09 -070036#include <linux/blkdev.h>
Paul Gortmaker38789fd2011-07-17 15:33:58 -040037#include <linux/export.h>
Jeff Garzik28555682007-10-11 17:12:35 -040038#include <linux/pci.h>
Tejun Heoece1d632006-04-02 18:51:53 +090039#include <scsi/scsi.h>
40#include <scsi/scsi_host.h>
41#include <scsi/scsi_eh.h>
42#include <scsi/scsi_device.h>
43#include <scsi/scsi_cmnd.h>
Robert Hancock65211482009-07-14 20:43:39 -060044#include <scsi/scsi_dbg.h>
Jeff Garzikc6fd2802006-08-10 07:31:37 -040045#include "../scsi/scsi_transport_api.h"
Tejun Heoece1d632006-04-02 18:51:53 +090046
47#include <linux/libata.h>
48
Hannes Reinecke255c03d2015-03-27 16:46:38 +010049#include <trace/events/libata.h>
Tejun Heoece1d632006-04-02 18:51:53 +090050#include "libata.h"
51
Tejun Heo7d47e8d2007-02-02 16:22:31 +090052enum {
Tejun Heo3884f7b2007-11-27 19:28:56 +090053 /* speed down verdicts */
Tejun Heo7d47e8d2007-02-02 16:22:31 +090054 ATA_EH_SPDN_NCQ_OFF = (1 << 0),
55 ATA_EH_SPDN_SPEED_DOWN = (1 << 1),
56 ATA_EH_SPDN_FALLBACK_TO_PIO = (1 << 2),
Tejun Heo76326ac2007-11-27 19:28:59 +090057 ATA_EH_SPDN_KEEP_ERRORS = (1 << 3),
Tejun Heo3884f7b2007-11-27 19:28:56 +090058
59 /* error flags */
60 ATA_EFLAG_IS_IO = (1 << 0),
Tejun Heo76326ac2007-11-27 19:28:59 +090061 ATA_EFLAG_DUBIOUS_XFER = (1 << 1),
Gwendal Grignoud9027472010-05-25 12:31:38 -070062 ATA_EFLAG_OLD_ER = (1 << 31),
Tejun Heo3884f7b2007-11-27 19:28:56 +090063
64 /* error categories */
65 ATA_ECAT_NONE = 0,
66 ATA_ECAT_ATA_BUS = 1,
67 ATA_ECAT_TOUT_HSM = 2,
68 ATA_ECAT_UNK_DEV = 3,
Tejun Heo75f9caf2008-01-03 01:21:14 +090069 ATA_ECAT_DUBIOUS_NONE = 4,
70 ATA_ECAT_DUBIOUS_ATA_BUS = 5,
71 ATA_ECAT_DUBIOUS_TOUT_HSM = 6,
72 ATA_ECAT_DUBIOUS_UNK_DEV = 7,
73 ATA_ECAT_NR = 8,
Tejun Heo7d47e8d2007-02-02 16:22:31 +090074
Tejun Heo87fbc5a2008-05-20 02:17:54 +090075 ATA_EH_CMD_DFL_TIMEOUT = 5000,
76
Tejun Heo0a2c0f52008-05-20 02:17:52 +090077 /* always put at least this amount of time between resets */
78 ATA_EH_RESET_COOL_DOWN = 5000,
79
Tejun Heo341c2c92008-05-20 02:17:51 +090080 /* Waiting in ->prereset can never be reliable. It's
81 * sometimes nice to wait there but it can't be depended upon;
82 * otherwise, we wouldn't be resetting. Just give it enough
83 * time for most drives to spin up.
84 */
85 ATA_EH_PRERESET_TIMEOUT = 10000,
86 ATA_EH_FASTDRAIN_INTERVAL = 3000,
Tejun Heo11fc33d2008-08-30 14:20:01 +020087
88 ATA_EH_UA_TRIES = 5,
Tejun Heoc2c7a892009-01-29 20:31:34 +090089
90 /* probe speed down parameters, see ata_eh_schedule_probe() */
91 ATA_EH_PROBE_TRIAL_INTERVAL = 60000, /* 1 min */
92 ATA_EH_PROBE_TRIALS = 2,
Tejun Heo31daabd2007-02-02 16:50:52 +090093};
94
95/* The following table determines how we sequence resets. Each entry
96 * represents timeout for that try. The first try can be soft or
97 * hardreset. All others are hardreset if available. In most cases
98 * the first reset w/ 10sec timeout should succeed. Following entries
Dan Williams35bf8822014-03-07 14:22:48 -080099 * are mostly for error handling, hotplug and those outlier devices that
100 * take an exceptionally long time to recover from reset.
Tejun Heo31daabd2007-02-02 16:50:52 +0900101 */
102static const unsigned long ata_eh_reset_timeouts[] = {
Tejun Heo341c2c92008-05-20 02:17:51 +0900103 10000, /* most drives spin up by 10sec */
104 10000, /* > 99% working drives spin up before 20sec */
Dan Williams35bf8822014-03-07 14:22:48 -0800105 35000, /* give > 30 secs of idleness for outlier devices */
Tejun Heo341c2c92008-05-20 02:17:51 +0900106 5000, /* and sweet one last chance */
Tejun Heod8af0eb2008-05-20 02:17:53 +0900107 ULONG_MAX, /* > 1 min has elapsed, give up */
Tejun Heo31daabd2007-02-02 16:50:52 +0900108};
109
Tejun Heo87fbc5a2008-05-20 02:17:54 +0900110static const unsigned long ata_eh_identify_timeouts[] = {
111 5000, /* covers > 99% of successes and not too boring on failures */
112 10000, /* combined time till here is enough even for media access */
113 30000, /* for true idiots */
114 ULONG_MAX,
115};
116
Tejun Heo6013efd2009-11-19 15:36:45 +0900117static const unsigned long ata_eh_flush_timeouts[] = {
118 15000, /* be generous with flush */
119 15000, /* ditto */
120 30000, /* and even more generous */
121 ULONG_MAX,
122};
123
Tejun Heo87fbc5a2008-05-20 02:17:54 +0900124static const unsigned long ata_eh_other_timeouts[] = {
125 5000, /* same rationale as identify timeout */
126 10000, /* ditto */
127 /* but no merciful 30sec for other commands, it just isn't worth it */
128 ULONG_MAX,
129};
130
131struct ata_eh_cmd_timeout_ent {
132 const u8 *commands;
133 const unsigned long *timeouts;
134};
135
136/* The following table determines timeouts to use for EH internal
137 * commands. Each table entry is a command class and matches the
138 * commands the entry applies to and the timeout table to use.
139 *
140 * On the retry after a command timed out, the next timeout value from
141 * the table is used. If the table doesn't contain further entries,
142 * the last value is used.
143 *
144 * ehc->cmd_timeout_idx keeps track of which timeout to use per
145 * command class, so if SET_FEATURES times out on the first try, the
146 * next try will use the second timeout value only for that class.
147 */
148#define CMDS(cmds...) (const u8 []){ cmds, 0 }
149static const struct ata_eh_cmd_timeout_ent
150ata_eh_cmd_timeout_table[ATA_EH_CMD_TIMEOUT_TABLE_SIZE] = {
151 { .commands = CMDS(ATA_CMD_ID_ATA, ATA_CMD_ID_ATAPI),
152 .timeouts = ata_eh_identify_timeouts, },
153 { .commands = CMDS(ATA_CMD_READ_NATIVE_MAX, ATA_CMD_READ_NATIVE_MAX_EXT),
154 .timeouts = ata_eh_other_timeouts, },
155 { .commands = CMDS(ATA_CMD_SET_MAX, ATA_CMD_SET_MAX_EXT),
156 .timeouts = ata_eh_other_timeouts, },
157 { .commands = CMDS(ATA_CMD_SET_FEATURES),
158 .timeouts = ata_eh_other_timeouts, },
159 { .commands = CMDS(ATA_CMD_INIT_DEV_PARAMS),
160 .timeouts = ata_eh_other_timeouts, },
Tejun Heo6013efd2009-11-19 15:36:45 +0900161 { .commands = CMDS(ATA_CMD_FLUSH, ATA_CMD_FLUSH_EXT),
162 .timeouts = ata_eh_flush_timeouts },
Tejun Heo87fbc5a2008-05-20 02:17:54 +0900163};
164#undef CMDS
165
Tejun Heoad9e2762006-05-15 20:58:12 +0900166static void __ata_port_freeze(struct ata_port *ap);
Tejun Heo6ffa01d2007-03-02 17:32:47 +0900167#ifdef CONFIG_PM
Tejun Heo500530f2006-07-03 16:07:27 +0900168static void ata_eh_handle_port_suspend(struct ata_port *ap);
169static void ata_eh_handle_port_resume(struct ata_port *ap);
Tejun Heo6ffa01d2007-03-02 17:32:47 +0900170#else /* CONFIG_PM */
171static void ata_eh_handle_port_suspend(struct ata_port *ap)
172{ }
173
174static void ata_eh_handle_port_resume(struct ata_port *ap)
175{ }
Tejun Heo6ffa01d2007-03-02 17:32:47 +0900176#endif /* CONFIG_PM */
Tejun Heoad9e2762006-05-15 20:58:12 +0900177
Tejun Heob64bbc32007-07-16 14:29:39 +0900178static void __ata_ehi_pushv_desc(struct ata_eh_info *ehi, const char *fmt,
179 va_list args)
180{
181 ehi->desc_len += vscnprintf(ehi->desc + ehi->desc_len,
182 ATA_EH_DESC_LEN - ehi->desc_len,
183 fmt, args);
184}
185
186/**
187 * __ata_ehi_push_desc - push error description without adding separator
188 * @ehi: target EHI
189 * @fmt: printf format string
190 *
191 * Format string according to @fmt and append it to @ehi->desc.
192 *
193 * LOCKING:
194 * spin_lock_irqsave(host lock)
195 */
196void __ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...)
197{
198 va_list args;
199
200 va_start(args, fmt);
201 __ata_ehi_pushv_desc(ehi, fmt, args);
202 va_end(args);
203}
204
205/**
206 * ata_ehi_push_desc - push error description with separator
207 * @ehi: target EHI
208 * @fmt: printf format string
209 *
210 * Format string according to @fmt and append it to @ehi->desc.
211 * If @ehi->desc is not empty, ", " is added in-between.
212 *
213 * LOCKING:
214 * spin_lock_irqsave(host lock)
215 */
216void ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...)
217{
218 va_list args;
219
220 if (ehi->desc_len)
221 __ata_ehi_push_desc(ehi, ", ");
222
223 va_start(args, fmt);
224 __ata_ehi_pushv_desc(ehi, fmt, args);
225 va_end(args);
226}
227
228/**
229 * ata_ehi_clear_desc - clean error description
230 * @ehi: target EHI
231 *
232 * Clear @ehi->desc.
233 *
234 * LOCKING:
235 * spin_lock_irqsave(host lock)
236 */
237void ata_ehi_clear_desc(struct ata_eh_info *ehi)
238{
239 ehi->desc[0] = '\0';
240 ehi->desc_len = 0;
241}
242
Tejun Heocbcdd872007-08-18 13:14:55 +0900243/**
244 * ata_port_desc - append port description
245 * @ap: target ATA port
246 * @fmt: printf format string
247 *
248 * Format string according to @fmt and append it to port
249 * description. If port description is not empty, " " is added
250 * in-between. This function is to be used while initializing
251 * ata_host. The description is printed on host registration.
252 *
253 * LOCKING:
254 * None.
255 */
256void ata_port_desc(struct ata_port *ap, const char *fmt, ...)
257{
258 va_list args;
259
260 WARN_ON(!(ap->pflags & ATA_PFLAG_INITIALIZING));
261
262 if (ap->link.eh_info.desc_len)
263 __ata_ehi_push_desc(&ap->link.eh_info, " ");
264
265 va_start(args, fmt);
266 __ata_ehi_pushv_desc(&ap->link.eh_info, fmt, args);
267 va_end(args);
268}
269
270#ifdef CONFIG_PCI
271
272/**
273 * ata_port_pbar_desc - append PCI BAR description
274 * @ap: target ATA port
275 * @bar: target PCI BAR
276 * @offset: offset into PCI BAR
277 * @name: name of the area
278 *
279 * If @offset is negative, this function formats a string which
280 * contains the name, address, size and type of the BAR and
281 * appends it to the port description. If @offset is zero or
282 * positive, only name and offsetted address is appended.
283 *
284 * LOCKING:
285 * None.
286 */
287void ata_port_pbar_desc(struct ata_port *ap, int bar, ssize_t offset,
288 const char *name)
289{
290 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
291 char *type = "";
292 unsigned long long start, len;
293
294 if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM)
295 type = "m";
296 else if (pci_resource_flags(pdev, bar) & IORESOURCE_IO)
297 type = "i";
298
299 start = (unsigned long long)pci_resource_start(pdev, bar);
300 len = (unsigned long long)pci_resource_len(pdev, bar);
301
302 if (offset < 0)
303 ata_port_desc(ap, "%s %s%llu@0x%llx", name, type, len, start);
304 else
Andrew Mortone6a73ab2007-12-13 16:01:37 -0800305 ata_port_desc(ap, "%s 0x%llx", name,
306 start + (unsigned long long)offset);
Tejun Heocbcdd872007-08-18 13:14:55 +0900307}
308
309#endif /* CONFIG_PCI */
310
Tejun Heo87fbc5a2008-05-20 02:17:54 +0900311static int ata_lookup_timeout_table(u8 cmd)
312{
313 int i;
314
315 for (i = 0; i < ATA_EH_CMD_TIMEOUT_TABLE_SIZE; i++) {
316 const u8 *cur;
317
318 for (cur = ata_eh_cmd_timeout_table[i].commands; *cur; cur++)
319 if (*cur == cmd)
320 return i;
321 }
322
323 return -1;
324}
325
326/**
327 * ata_internal_cmd_timeout - determine timeout for an internal command
328 * @dev: target device
329 * @cmd: internal command to be issued
330 *
331 * Determine timeout for internal command @cmd for @dev.
332 *
333 * LOCKING:
334 * EH context.
335 *
336 * RETURNS:
337 * Determined timeout.
338 */
339unsigned long ata_internal_cmd_timeout(struct ata_device *dev, u8 cmd)
340{
341 struct ata_eh_context *ehc = &dev->link->eh_context;
342 int ent = ata_lookup_timeout_table(cmd);
343 int idx;
344
345 if (ent < 0)
346 return ATA_EH_CMD_DFL_TIMEOUT;
347
348 idx = ehc->cmd_timeout_idx[dev->devno][ent];
349 return ata_eh_cmd_timeout_table[ent].timeouts[idx];
350}
351
352/**
353 * ata_internal_cmd_timed_out - notification for internal command timeout
354 * @dev: target device
355 * @cmd: internal command which timed out
356 *
357 * Notify EH that internal command @cmd for @dev timed out. This
358 * function should be called only for commands whose timeouts are
359 * determined using ata_internal_cmd_timeout().
360 *
361 * LOCKING:
362 * EH context.
363 */
364void ata_internal_cmd_timed_out(struct ata_device *dev, u8 cmd)
365{
366 struct ata_eh_context *ehc = &dev->link->eh_context;
367 int ent = ata_lookup_timeout_table(cmd);
368 int idx;
369
370 if (ent < 0)
371 return;
372
373 idx = ehc->cmd_timeout_idx[dev->devno][ent];
374 if (ata_eh_cmd_timeout_table[ent].timeouts[idx + 1] != ULONG_MAX)
375 ehc->cmd_timeout_idx[dev->devno][ent]++;
376}
377
Tejun Heo3884f7b2007-11-27 19:28:56 +0900378static void ata_ering_record(struct ata_ering *ering, unsigned int eflags,
Tejun Heo0c247c52006-05-15 20:58:19 +0900379 unsigned int err_mask)
380{
381 struct ata_ering_entry *ent;
382
383 WARN_ON(!err_mask);
384
385 ering->cursor++;
386 ering->cursor %= ATA_ERING_SIZE;
387
388 ent = &ering->ring[ering->cursor];
Tejun Heo3884f7b2007-11-27 19:28:56 +0900389 ent->eflags = eflags;
Tejun Heo0c247c52006-05-15 20:58:19 +0900390 ent->err_mask = err_mask;
391 ent->timestamp = get_jiffies_64();
392}
393
Tejun Heo76326ac2007-11-27 19:28:59 +0900394static struct ata_ering_entry *ata_ering_top(struct ata_ering *ering)
395{
396 struct ata_ering_entry *ent = &ering->ring[ering->cursor];
397
398 if (ent->err_mask)
399 return ent;
400 return NULL;
401}
402
Gwendal Grignoud9027472010-05-25 12:31:38 -0700403int ata_ering_map(struct ata_ering *ering,
404 int (*map_fn)(struct ata_ering_entry *, void *),
405 void *arg)
Tejun Heo0c247c52006-05-15 20:58:19 +0900406{
407 int idx, rc = 0;
408 struct ata_ering_entry *ent;
409
410 idx = ering->cursor;
411 do {
412 ent = &ering->ring[idx];
413 if (!ent->err_mask)
414 break;
415 rc = map_fn(ent, arg);
416 if (rc)
417 break;
418 idx = (idx - 1 + ATA_ERING_SIZE) % ATA_ERING_SIZE;
419 } while (idx != ering->cursor);
420
421 return rc;
422}
423
H Hartley Sweeten60428402012-04-12 15:40:37 -0700424static int ata_ering_clear_cb(struct ata_ering_entry *ent, void *void_arg)
Gwendal Grignoud9027472010-05-25 12:31:38 -0700425{
426 ent->eflags |= ATA_EFLAG_OLD_ER;
427 return 0;
428}
429
430static void ata_ering_clear(struct ata_ering *ering)
431{
432 ata_ering_map(ering, ata_ering_clear_cb, NULL);
433}
434
Tejun Heo64f65ca2006-06-24 20:30:18 +0900435static unsigned int ata_eh_dev_action(struct ata_device *dev)
436{
Tejun Heo9af5c9c2007-08-06 18:36:22 +0900437 struct ata_eh_context *ehc = &dev->link->eh_context;
Tejun Heo64f65ca2006-06-24 20:30:18 +0900438
439 return ehc->i.action | ehc->i.dev_action[dev->devno];
440}
441
Tejun Heof58229f2007-08-06 18:36:23 +0900442static void ata_eh_clear_action(struct ata_link *link, struct ata_device *dev,
Tejun Heoaf181c22006-06-24 20:30:18 +0900443 struct ata_eh_info *ehi, unsigned int action)
444{
Tejun Heof58229f2007-08-06 18:36:23 +0900445 struct ata_device *tdev;
Tejun Heoaf181c22006-06-24 20:30:18 +0900446
447 if (!dev) {
448 ehi->action &= ~action;
Tejun Heo1eca4362008-11-03 20:03:17 +0900449 ata_for_each_dev(tdev, link, ALL)
Tejun Heof58229f2007-08-06 18:36:23 +0900450 ehi->dev_action[tdev->devno] &= ~action;
Tejun Heoaf181c22006-06-24 20:30:18 +0900451 } else {
452 /* doesn't make sense for port-wide EH actions */
453 WARN_ON(!(action & ATA_EH_PERDEV_MASK));
454
455 /* break ehi->action into ehi->dev_action */
456 if (ehi->action & action) {
Tejun Heo1eca4362008-11-03 20:03:17 +0900457 ata_for_each_dev(tdev, link, ALL)
Tejun Heof58229f2007-08-06 18:36:23 +0900458 ehi->dev_action[tdev->devno] |=
459 ehi->action & action;
Tejun Heoaf181c22006-06-24 20:30:18 +0900460 ehi->action &= ~action;
461 }
462
463 /* turn off the specified per-dev action */
464 ehi->dev_action[dev->devno] &= ~action;
465 }
466}
467
Tejun Heoece1d632006-04-02 18:51:53 +0900468/**
Tejun Heoc0c362b2010-09-06 17:57:14 +0200469 * ata_eh_acquire - acquire EH ownership
470 * @ap: ATA port to acquire EH ownership for
471 *
472 * Acquire EH ownership for @ap. This is the basic exclusion
473 * mechanism for ports sharing a host. Only one port hanging off
474 * the same host can claim the ownership of EH.
475 *
476 * LOCKING:
477 * EH context.
478 */
479void ata_eh_acquire(struct ata_port *ap)
480{
481 mutex_lock(&ap->host->eh_mutex);
482 WARN_ON_ONCE(ap->host->eh_owner);
483 ap->host->eh_owner = current;
484}
485
486/**
487 * ata_eh_release - release EH ownership
488 * @ap: ATA port to release EH ownership for
489 *
490 * Release EH ownership for @ap if the caller. The caller must
491 * have acquired EH ownership using ata_eh_acquire() previously.
492 *
493 * LOCKING:
494 * EH context.
495 */
496void ata_eh_release(struct ata_port *ap)
497{
498 WARN_ON_ONCE(ap->host->eh_owner != current);
499 ap->host->eh_owner = NULL;
500 mutex_unlock(&ap->host->eh_mutex);
501}
502
503/**
Tejun Heoece1d632006-04-02 18:51:53 +0900504 * ata_scsi_timed_out - SCSI layer time out callback
505 * @cmd: timed out SCSI command
506 *
507 * Handles SCSI layer timeout. We race with normal completion of
508 * the qc for @cmd. If the qc is already gone, we lose and let
509 * the scsi command finish (EH_HANDLED). Otherwise, the qc has
510 * timed out and EH should be invoked. Prevent ata_qc_complete()
511 * from finishing it by setting EH_SCHEDULED and return
512 * EH_NOT_HANDLED.
513 *
Tejun Heoad9e2762006-05-15 20:58:12 +0900514 * TODO: kill this function once old EH is gone.
515 *
Tejun Heoece1d632006-04-02 18:51:53 +0900516 * LOCKING:
517 * Called from timer context
518 *
519 * RETURNS:
520 * EH_HANDLED or EH_NOT_HANDLED
521 */
Jens Axboe242f9dc2008-09-14 05:55:09 -0700522enum blk_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd)
Tejun Heoece1d632006-04-02 18:51:53 +0900523{
524 struct Scsi_Host *host = cmd->device->host;
Jeff Garzik35bb94b2006-04-11 13:12:34 -0400525 struct ata_port *ap = ata_shost_to_port(host);
Tejun Heoece1d632006-04-02 18:51:53 +0900526 unsigned long flags;
527 struct ata_queued_cmd *qc;
Jens Axboe242f9dc2008-09-14 05:55:09 -0700528 enum blk_eh_timer_return ret;
Tejun Heoece1d632006-04-02 18:51:53 +0900529
530 DPRINTK("ENTER\n");
531
Tejun Heoad9e2762006-05-15 20:58:12 +0900532 if (ap->ops->error_handler) {
Jens Axboe242f9dc2008-09-14 05:55:09 -0700533 ret = BLK_EH_NOT_HANDLED;
Tejun Heoad9e2762006-05-15 20:58:12 +0900534 goto out;
535 }
536
Jens Axboe242f9dc2008-09-14 05:55:09 -0700537 ret = BLK_EH_HANDLED;
Jeff Garzikba6a1302006-06-22 23:46:10 -0400538 spin_lock_irqsave(ap->lock, flags);
Tejun Heo9af5c9c2007-08-06 18:36:22 +0900539 qc = ata_qc_from_tag(ap, ap->link.active_tag);
Tejun Heoece1d632006-04-02 18:51:53 +0900540 if (qc) {
541 WARN_ON(qc->scsicmd != cmd);
542 qc->flags |= ATA_QCFLAG_EH_SCHEDULED;
543 qc->err_mask |= AC_ERR_TIMEOUT;
Jens Axboe242f9dc2008-09-14 05:55:09 -0700544 ret = BLK_EH_NOT_HANDLED;
Tejun Heoece1d632006-04-02 18:51:53 +0900545 }
Jeff Garzikba6a1302006-06-22 23:46:10 -0400546 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoece1d632006-04-02 18:51:53 +0900547
Tejun Heoad9e2762006-05-15 20:58:12 +0900548 out:
Tejun Heoece1d632006-04-02 18:51:53 +0900549 DPRINTK("EXIT, ret=%d\n", ret);
550 return ret;
551}
552
Tejun Heoece180d2008-11-03 20:04:37 +0900553static void ata_eh_unload(struct ata_port *ap)
554{
555 struct ata_link *link;
556 struct ata_device *dev;
557 unsigned long flags;
558
559 /* Restore SControl IPM and SPD for the next driver and
560 * disable attached devices.
561 */
562 ata_for_each_link(link, ap, PMP_FIRST) {
563 sata_scr_write(link, SCR_CONTROL, link->saved_scontrol & 0xff0);
564 ata_for_each_dev(dev, link, ALL)
565 ata_dev_disable(dev);
566 }
567
568 /* freeze and set UNLOADED */
569 spin_lock_irqsave(ap->lock, flags);
570
571 ata_port_freeze(ap); /* won't be thawed */
572 ap->pflags &= ~ATA_PFLAG_EH_PENDING; /* clear pending from freeze */
573 ap->pflags |= ATA_PFLAG_UNLOADED;
574
575 spin_unlock_irqrestore(ap->lock, flags);
576}
577
Tejun Heoece1d632006-04-02 18:51:53 +0900578/**
579 * ata_scsi_error - SCSI layer error handler callback
580 * @host: SCSI host on which error occurred
581 *
582 * Handles SCSI-layer-thrown error events.
583 *
584 * LOCKING:
585 * Inherited from SCSI layer (none, can sleep)
586 *
587 * RETURNS:
588 * Zero.
589 */
Jeff Garzik381544b2006-04-11 13:04:39 -0400590void ata_scsi_error(struct Scsi_Host *host)
Tejun Heoece1d632006-04-02 18:51:53 +0900591{
Jeff Garzik35bb94b2006-04-11 13:12:34 -0400592 struct ata_port *ap = ata_shost_to_port(host);
Tejun Heoad9e2762006-05-15 20:58:12 +0900593 unsigned long flags;
James Bottomleyc34aeeb2011-01-23 08:31:14 -0600594 LIST_HEAD(eh_work_q);
Tejun Heoece1d632006-04-02 18:51:53 +0900595
596 DPRINTK("ENTER\n");
597
James Bottomleyc34aeeb2011-01-23 08:31:14 -0600598 spin_lock_irqsave(host->host_lock, flags);
599 list_splice_init(&host->eh_cmd_q, &eh_work_q);
600 spin_unlock_irqrestore(host->host_lock, flags);
601
James Bottomley0e0b494c2011-01-23 09:42:50 -0600602 ata_scsi_cmd_error_handler(host, ap, &eh_work_q);
603
604 /* If we timed raced normal completion and there is nothing to
605 recover nr_timedout == 0 why exactly are we doing error recovery ? */
606 ata_scsi_port_error_handler(host, ap);
607
608 /* finish or retry handled scmd's and clean up */
609 WARN_ON(host->host_failed || !list_empty(&eh_work_q));
610
611 DPRINTK("EXIT\n");
612}
613
614/**
615 * ata_scsi_cmd_error_handler - error callback for a list of commands
616 * @host: scsi host containing the port
617 * @ap: ATA port within the host
618 * @eh_work_q: list of commands to process
619 *
620 * process the given list of commands and return those finished to the
621 * ap->eh_done_q. This function is the first part of the libata error
622 * handler which processes a given list of failed commands.
623 */
624void ata_scsi_cmd_error_handler(struct Scsi_Host *host, struct ata_port *ap,
625 struct list_head *eh_work_q)
626{
627 int i;
628 unsigned long flags;
629
Tejun Heoc4291372010-05-10 21:41:38 +0200630 /* make sure sff pio task is not running */
631 ata_sff_flush_pio_task(ap);
Tejun Heoece1d632006-04-02 18:51:53 +0900632
Jeff Garzikcca39742006-08-24 03:19:22 -0400633 /* synchronize with host lock and sort out timeouts */
Tejun Heoece1d632006-04-02 18:51:53 +0900634
Tejun Heoad9e2762006-05-15 20:58:12 +0900635 /* For new EH, all qcs are finished in one of three ways -
636 * normal completion, error completion, and SCSI timeout.
Alan Coxc96f1732009-03-24 10:23:46 +0000637 * Both completions can race against SCSI timeout. When normal
Tejun Heoad9e2762006-05-15 20:58:12 +0900638 * completion wins, the qc never reaches EH. When error
639 * completion wins, the qc has ATA_QCFLAG_FAILED set.
640 *
641 * When SCSI timeout wins, things are a bit more complex.
642 * Normal or error completion can occur after the timeout but
643 * before this point. In such cases, both types of
644 * completions are honored. A scmd is determined to have
645 * timed out iff its associated qc is active and not failed.
646 */
647 if (ap->ops->error_handler) {
648 struct scsi_cmnd *scmd, *tmp;
649 int nr_timedout = 0;
Tejun Heoece1d632006-04-02 18:51:53 +0900650
Tejun Heoe30349d2006-07-03 03:02:15 +0900651 spin_lock_irqsave(ap->lock, flags);
Gwendal Grignoud9027472010-05-25 12:31:38 -0700652
Alan Coxc96f1732009-03-24 10:23:46 +0000653 /* This must occur under the ap->lock as we don't want
654 a polled recovery to race the real interrupt handler
Gwendal Grignoud9027472010-05-25 12:31:38 -0700655
Alan Coxc96f1732009-03-24 10:23:46 +0000656 The lost_interrupt handler checks for any completed but
657 non-notified command and completes much like an IRQ handler.
Gwendal Grignoud9027472010-05-25 12:31:38 -0700658
Alan Coxc96f1732009-03-24 10:23:46 +0000659 We then fall into the error recovery code which will treat
660 this as if normal completion won the race */
Tejun Heoad9e2762006-05-15 20:58:12 +0900661
Alan Coxc96f1732009-03-24 10:23:46 +0000662 if (ap->ops->lost_interrupt)
663 ap->ops->lost_interrupt(ap);
Gwendal Grignoud9027472010-05-25 12:31:38 -0700664
James Bottomley0e0b494c2011-01-23 09:42:50 -0600665 list_for_each_entry_safe(scmd, tmp, eh_work_q, eh_entry) {
Tejun Heoad9e2762006-05-15 20:58:12 +0900666 struct ata_queued_cmd *qc;
667
668 for (i = 0; i < ATA_MAX_QUEUE; i++) {
669 qc = __ata_qc_from_tag(ap, i);
670 if (qc->flags & ATA_QCFLAG_ACTIVE &&
671 qc->scsicmd == scmd)
672 break;
673 }
674
675 if (i < ATA_MAX_QUEUE) {
676 /* the scmd has an associated qc */
677 if (!(qc->flags & ATA_QCFLAG_FAILED)) {
678 /* which hasn't failed yet, timeout */
679 qc->err_mask |= AC_ERR_TIMEOUT;
680 qc->flags |= ATA_QCFLAG_FAILED;
681 nr_timedout++;
682 }
683 } else {
684 /* Normal completion occurred after
685 * SCSI timeout but before this point.
686 * Successfully complete it.
687 */
688 scmd->retries = scmd->allowed;
689 scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
690 }
691 }
692
693 /* If we have timed out qcs. They belong to EH from
694 * this point but the state of the controller is
695 * unknown. Freeze the port to make sure the IRQ
696 * handler doesn't diddle with those qcs. This must
697 * be done atomically w.r.t. setting QCFLAG_FAILED.
698 */
699 if (nr_timedout)
700 __ata_port_freeze(ap);
701
Tejun Heoe30349d2006-07-03 03:02:15 +0900702 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoa1e10f72007-08-18 13:28:49 +0900703
704 /* initialize eh_tries */
705 ap->eh_tries = ATA_EH_MAX_TRIES;
Tejun Heoad9e2762006-05-15 20:58:12 +0900706 } else
Tejun Heoe30349d2006-07-03 03:02:15 +0900707 spin_unlock_wait(ap->lock);
Gwendal Grignoud9027472010-05-25 12:31:38 -0700708
James Bottomley0e0b494c2011-01-23 09:42:50 -0600709}
710EXPORT_SYMBOL(ata_scsi_cmd_error_handler);
711
712/**
713 * ata_scsi_port_error_handler - recover the port after the commands
714 * @host: SCSI host containing the port
715 * @ap: the ATA port
716 *
717 * Handle the recovery of the port @ap after all the commands
718 * have been recovered.
719 */
720void ata_scsi_port_error_handler(struct Scsi_Host *host, struct ata_port *ap)
721{
722 unsigned long flags;
Tejun Heoad9e2762006-05-15 20:58:12 +0900723
Tejun Heoad9e2762006-05-15 20:58:12 +0900724 /* invoke error handler */
725 if (ap->ops->error_handler) {
Tejun Heocf1b86c2007-08-06 18:36:23 +0900726 struct ata_link *link;
727
Tejun Heoc0c362b2010-09-06 17:57:14 +0200728 /* acquire EH ownership */
729 ata_eh_acquire(ap);
730 repeat:
Tejun Heo5ddf24c2007-07-16 14:29:41 +0900731 /* kill fast drain timer */
732 del_timer_sync(&ap->fastdrain_timer);
733
Tejun Heo500530f2006-07-03 16:07:27 +0900734 /* process port resume request */
735 ata_eh_handle_port_resume(ap);
736
Tejun Heof3e81b12006-05-15 20:58:21 +0900737 /* fetch & clear EH info */
Tejun Heoe30349d2006-07-03 03:02:15 +0900738 spin_lock_irqsave(ap->lock, flags);
Tejun Heof3e81b12006-05-15 20:58:21 +0900739
Tejun Heo1eca4362008-11-03 20:03:17 +0900740 ata_for_each_link(link, ap, HOST_FIRST) {
Tejun Heo00115e02007-11-27 19:28:58 +0900741 struct ata_eh_context *ehc = &link->eh_context;
742 struct ata_device *dev;
743
Tejun Heocf1b86c2007-08-06 18:36:23 +0900744 memset(&link->eh_context, 0, sizeof(link->eh_context));
745 link->eh_context.i = link->eh_info;
746 memset(&link->eh_info, 0, sizeof(link->eh_info));
Tejun Heo00115e02007-11-27 19:28:58 +0900747
Tejun Heo1eca4362008-11-03 20:03:17 +0900748 ata_for_each_dev(dev, link, ENABLED) {
Tejun Heo00115e02007-11-27 19:28:58 +0900749 int devno = dev->devno;
750
751 ehc->saved_xfer_mode[devno] = dev->xfer_mode;
752 if (ata_ncq_enabled(dev))
753 ehc->saved_ncq_enabled |= 1 << devno;
754 }
Tejun Heocf1b86c2007-08-06 18:36:23 +0900755 }
Tejun Heof3e81b12006-05-15 20:58:21 +0900756
Tejun Heob51e9e52006-06-29 01:29:30 +0900757 ap->pflags |= ATA_PFLAG_EH_IN_PROGRESS;
758 ap->pflags &= ~ATA_PFLAG_EH_PENDING;
Tejun Heoda917d62007-09-23 13:14:12 +0900759 ap->excl_link = NULL; /* don't maintain exclusion over EH */
Tejun Heof3e81b12006-05-15 20:58:21 +0900760
Tejun Heoe30349d2006-07-03 03:02:15 +0900761 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoad9e2762006-05-15 20:58:12 +0900762
Tejun Heo500530f2006-07-03 16:07:27 +0900763 /* invoke EH, skip if unloading or suspended */
764 if (!(ap->pflags & (ATA_PFLAG_UNLOADING | ATA_PFLAG_SUSPENDED)))
Tejun Heo720ba122006-05-31 18:28:13 +0900765 ap->ops->error_handler(ap);
Tejun Heoece180d2008-11-03 20:04:37 +0900766 else {
767 /* if unloading, commence suicide */
768 if ((ap->pflags & ATA_PFLAG_UNLOADING) &&
769 !(ap->pflags & ATA_PFLAG_UNLOADED))
770 ata_eh_unload(ap);
Tejun Heo720ba122006-05-31 18:28:13 +0900771 ata_eh_finish(ap);
Tejun Heoece180d2008-11-03 20:04:37 +0900772 }
Tejun Heoad9e2762006-05-15 20:58:12 +0900773
Tejun Heo500530f2006-07-03 16:07:27 +0900774 /* process port suspend request */
775 ata_eh_handle_port_suspend(ap);
776
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300777 /* Exception might have happened after ->error_handler
Tejun Heoad9e2762006-05-15 20:58:12 +0900778 * recovered the port but before this point. Repeat
779 * EH in such case.
780 */
Tejun Heoe30349d2006-07-03 03:02:15 +0900781 spin_lock_irqsave(ap->lock, flags);
Tejun Heoad9e2762006-05-15 20:58:12 +0900782
Tejun Heob51e9e52006-06-29 01:29:30 +0900783 if (ap->pflags & ATA_PFLAG_EH_PENDING) {
Tejun Heoa1e10f72007-08-18 13:28:49 +0900784 if (--ap->eh_tries) {
Tejun Heoe30349d2006-07-03 03:02:15 +0900785 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoad9e2762006-05-15 20:58:12 +0900786 goto repeat;
787 }
Joe Perchesa9a79df2011-04-15 15:51:59 -0700788 ata_port_err(ap,
789 "EH pending after %d tries, giving up\n",
790 ATA_EH_MAX_TRIES);
Tejun Heo914616a2007-06-25 21:47:11 +0900791 ap->pflags &= ~ATA_PFLAG_EH_PENDING;
Tejun Heoad9e2762006-05-15 20:58:12 +0900792 }
793
Tejun Heof3e81b12006-05-15 20:58:21 +0900794 /* this run is complete, make sure EH info is clear */
Tejun Heo1eca4362008-11-03 20:03:17 +0900795 ata_for_each_link(link, ap, HOST_FIRST)
Tejun Heocf1b86c2007-08-06 18:36:23 +0900796 memset(&link->eh_info, 0, sizeof(link->eh_info));
Tejun Heof3e81b12006-05-15 20:58:21 +0900797
Dan Williamse4a9c372012-06-21 23:25:27 -0700798 /* end eh (clear host_eh_scheduled) while holding
799 * ap->lock such that if exception occurs after this
800 * point but before EH completion, SCSI midlayer will
Tejun Heoad9e2762006-05-15 20:58:12 +0900801 * re-initiate EH.
802 */
Dan Williamse4a9c372012-06-21 23:25:27 -0700803 ap->ops->end_eh(ap);
Tejun Heoad9e2762006-05-15 20:58:12 +0900804
Tejun Heoe30349d2006-07-03 03:02:15 +0900805 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoc0c362b2010-09-06 17:57:14 +0200806 ata_eh_release(ap);
Tejun Heoad9e2762006-05-15 20:58:12 +0900807 } else {
Tejun Heo9af5c9c2007-08-06 18:36:22 +0900808 WARN_ON(ata_qc_from_tag(ap, ap->link.active_tag) == NULL);
Tejun Heoad9e2762006-05-15 20:58:12 +0900809 ap->ops->eng_timeout(ap);
810 }
811
Tejun Heoece1d632006-04-02 18:51:53 +0900812 scsi_eh_flush_done_q(&ap->eh_done_q);
813
Tejun Heoad9e2762006-05-15 20:58:12 +0900814 /* clean up */
Tejun Heoe30349d2006-07-03 03:02:15 +0900815 spin_lock_irqsave(ap->lock, flags);
Tejun Heoad9e2762006-05-15 20:58:12 +0900816
Tejun Heo1cdaf532006-07-03 16:07:26 +0900817 if (ap->pflags & ATA_PFLAG_LOADING)
Tejun Heob51e9e52006-06-29 01:29:30 +0900818 ap->pflags &= ~ATA_PFLAG_LOADING;
Tejun Heo1cdaf532006-07-03 16:07:26 +0900819 else if (ap->pflags & ATA_PFLAG_SCSI_HOTPLUG)
Tejun Heoad72cf92010-07-02 10:03:52 +0200820 schedule_delayed_work(&ap->hotplug_task, 0);
Tejun Heo1cdaf532006-07-03 16:07:26 +0900821
822 if (ap->pflags & ATA_PFLAG_RECOVERED)
Joe Perchesa9a79df2011-04-15 15:51:59 -0700823 ata_port_info(ap, "EH complete\n");
Tejun Heo580b21022006-05-31 18:28:05 +0900824
Tejun Heob51e9e52006-06-29 01:29:30 +0900825 ap->pflags &= ~(ATA_PFLAG_SCSI_HOTPLUG | ATA_PFLAG_RECOVERED);
Tejun Heoad9e2762006-05-15 20:58:12 +0900826
Tejun Heoc6cf9e92006-05-31 18:27:27 +0900827 /* tell wait_eh that we're done */
Tejun Heob51e9e52006-06-29 01:29:30 +0900828 ap->pflags &= ~ATA_PFLAG_EH_IN_PROGRESS;
Tejun Heoc6cf9e92006-05-31 18:27:27 +0900829 wake_up_all(&ap->eh_wait_q);
830
Tejun Heoe30349d2006-07-03 03:02:15 +0900831 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoece1d632006-04-02 18:51:53 +0900832}
James Bottomley0e0b494c2011-01-23 09:42:50 -0600833EXPORT_SYMBOL_GPL(ata_scsi_port_error_handler);
Tejun Heoece1d632006-04-02 18:51:53 +0900834
835/**
Tejun Heoc6cf9e92006-05-31 18:27:27 +0900836 * ata_port_wait_eh - Wait for the currently pending EH to complete
837 * @ap: Port to wait EH for
838 *
839 * Wait until the currently pending EH is complete.
840 *
841 * LOCKING:
842 * Kernel thread context (may sleep).
843 */
844void ata_port_wait_eh(struct ata_port *ap)
845{
846 unsigned long flags;
847 DEFINE_WAIT(wait);
848
849 retry:
Jeff Garzikba6a1302006-06-22 23:46:10 -0400850 spin_lock_irqsave(ap->lock, flags);
Tejun Heoc6cf9e92006-05-31 18:27:27 +0900851
Tejun Heob51e9e52006-06-29 01:29:30 +0900852 while (ap->pflags & (ATA_PFLAG_EH_PENDING | ATA_PFLAG_EH_IN_PROGRESS)) {
Tejun Heoc6cf9e92006-05-31 18:27:27 +0900853 prepare_to_wait(&ap->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
Jeff Garzikba6a1302006-06-22 23:46:10 -0400854 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoc6cf9e92006-05-31 18:27:27 +0900855 schedule();
Jeff Garzikba6a1302006-06-22 23:46:10 -0400856 spin_lock_irqsave(ap->lock, flags);
Tejun Heoc6cf9e92006-05-31 18:27:27 +0900857 }
Tejun Heo0a1b6222006-06-11 11:01:38 +0900858 finish_wait(&ap->eh_wait_q, &wait);
Tejun Heoc6cf9e92006-05-31 18:27:27 +0900859
Jeff Garzikba6a1302006-06-22 23:46:10 -0400860 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoc6cf9e92006-05-31 18:27:27 +0900861
862 /* make sure SCSI EH is complete */
Jeff Garzikcca39742006-08-24 03:19:22 -0400863 if (scsi_host_in_recovery(ap->scsi_host)) {
Tejun Heo97750ce2010-09-06 17:56:29 +0200864 ata_msleep(ap, 10);
Tejun Heoc6cf9e92006-05-31 18:27:27 +0900865 goto retry;
866 }
867}
Dan Williams81c757b2011-12-02 16:07:01 -0800868EXPORT_SYMBOL_GPL(ata_port_wait_eh);
Tejun Heoc6cf9e92006-05-31 18:27:27 +0900869
Tejun Heo5ddf24c2007-07-16 14:29:41 +0900870static int ata_eh_nr_in_flight(struct ata_port *ap)
871{
872 unsigned int tag;
873 int nr = 0;
874
875 /* count only non-internal commands */
876 for (tag = 0; tag < ATA_MAX_QUEUE - 1; tag++)
877 if (ata_qc_from_tag(ap, tag))
878 nr++;
879
880 return nr;
881}
882
883void ata_eh_fastdrain_timerfn(unsigned long arg)
884{
885 struct ata_port *ap = (void *)arg;
886 unsigned long flags;
887 int cnt;
888
889 spin_lock_irqsave(ap->lock, flags);
890
891 cnt = ata_eh_nr_in_flight(ap);
892
893 /* are we done? */
894 if (!cnt)
895 goto out_unlock;
896
897 if (cnt == ap->fastdrain_cnt) {
898 unsigned int tag;
899
900 /* No progress during the last interval, tag all
901 * in-flight qcs as timed out and freeze the port.
902 */
903 for (tag = 0; tag < ATA_MAX_QUEUE - 1; tag++) {
904 struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag);
905 if (qc)
906 qc->err_mask |= AC_ERR_TIMEOUT;
907 }
908
909 ata_port_freeze(ap);
910 } else {
911 /* some qcs have finished, give it another chance */
912 ap->fastdrain_cnt = cnt;
913 ap->fastdrain_timer.expires =
Tejun Heo341c2c92008-05-20 02:17:51 +0900914 ata_deadline(jiffies, ATA_EH_FASTDRAIN_INTERVAL);
Tejun Heo5ddf24c2007-07-16 14:29:41 +0900915 add_timer(&ap->fastdrain_timer);
916 }
917
918 out_unlock:
919 spin_unlock_irqrestore(ap->lock, flags);
920}
921
922/**
923 * ata_eh_set_pending - set ATA_PFLAG_EH_PENDING and activate fast drain
924 * @ap: target ATA port
925 * @fastdrain: activate fast drain
926 *
927 * Set ATA_PFLAG_EH_PENDING and activate fast drain if @fastdrain
928 * is non-zero and EH wasn't pending before. Fast drain ensures
929 * that EH kicks in in timely manner.
930 *
931 * LOCKING:
932 * spin_lock_irqsave(host lock)
933 */
934static void ata_eh_set_pending(struct ata_port *ap, int fastdrain)
935{
936 int cnt;
937
938 /* already scheduled? */
939 if (ap->pflags & ATA_PFLAG_EH_PENDING)
940 return;
941
942 ap->pflags |= ATA_PFLAG_EH_PENDING;
943
944 if (!fastdrain)
945 return;
946
947 /* do we have in-flight qcs? */
948 cnt = ata_eh_nr_in_flight(ap);
949 if (!cnt)
950 return;
951
952 /* activate fast drain */
953 ap->fastdrain_cnt = cnt;
Tejun Heo341c2c92008-05-20 02:17:51 +0900954 ap->fastdrain_timer.expires =
955 ata_deadline(jiffies, ATA_EH_FASTDRAIN_INTERVAL);
Tejun Heo5ddf24c2007-07-16 14:29:41 +0900956 add_timer(&ap->fastdrain_timer);
957}
958
Tejun Heof686bcb2006-05-15 20:58:05 +0900959/**
960 * ata_qc_schedule_eh - schedule qc for error handling
961 * @qc: command to schedule error handling for
962 *
963 * Schedule error handling for @qc. EH will kick in as soon as
964 * other commands are drained.
965 *
966 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -0400967 * spin_lock_irqsave(host lock)
Tejun Heof686bcb2006-05-15 20:58:05 +0900968 */
969void ata_qc_schedule_eh(struct ata_queued_cmd *qc)
970{
971 struct ata_port *ap = qc->ap;
Tejun Heofa41efd2010-04-15 08:57:37 +0900972 struct request_queue *q = qc->scsicmd->device->request_queue;
973 unsigned long flags;
Tejun Heof686bcb2006-05-15 20:58:05 +0900974
975 WARN_ON(!ap->ops->error_handler);
976
977 qc->flags |= ATA_QCFLAG_FAILED;
Tejun Heo5ddf24c2007-07-16 14:29:41 +0900978 ata_eh_set_pending(ap, 1);
Tejun Heof686bcb2006-05-15 20:58:05 +0900979
980 /* The following will fail if timeout has already expired.
981 * ata_scsi_error() takes care of such scmds on EH entry.
982 * Note that ATA_QCFLAG_FAILED is unconditionally set after
983 * this function completes.
984 */
Tejun Heofa41efd2010-04-15 08:57:37 +0900985 spin_lock_irqsave(q->queue_lock, flags);
Jens Axboe242f9dc2008-09-14 05:55:09 -0700986 blk_abort_request(qc->scsicmd->request);
Tejun Heofa41efd2010-04-15 08:57:37 +0900987 spin_unlock_irqrestore(q->queue_lock, flags);
Tejun Heof686bcb2006-05-15 20:58:05 +0900988}
989
Tejun Heo7b70fc02006-05-15 20:58:07 +0900990/**
Dan Williamse4a9c372012-06-21 23:25:27 -0700991 * ata_std_sched_eh - non-libsas ata_ports issue eh with this common routine
992 * @ap: ATA port to schedule EH for
993 *
994 * LOCKING: inherited from ata_port_schedule_eh
995 * spin_lock_irqsave(host lock)
996 */
997void ata_std_sched_eh(struct ata_port *ap)
998{
999 WARN_ON(!ap->ops->error_handler);
1000
1001 if (ap->pflags & ATA_PFLAG_INITIALIZING)
1002 return;
1003
1004 ata_eh_set_pending(ap, 1);
1005 scsi_schedule_eh(ap->scsi_host);
1006
1007 DPRINTK("port EH scheduled\n");
1008}
1009EXPORT_SYMBOL_GPL(ata_std_sched_eh);
1010
1011/**
1012 * ata_std_end_eh - non-libsas ata_ports complete eh with this common routine
1013 * @ap: ATA port to end EH for
1014 *
1015 * In the libata object model there is a 1:1 mapping of ata_port to
1016 * shost, so host fields can be directly manipulated under ap->lock, in
1017 * the libsas case we need to hold a lock at the ha->level to coordinate
1018 * these events.
1019 *
1020 * LOCKING:
1021 * spin_lock_irqsave(host lock)
1022 */
1023void ata_std_end_eh(struct ata_port *ap)
1024{
1025 struct Scsi_Host *host = ap->scsi_host;
1026
1027 host->host_eh_scheduled = 0;
1028}
1029EXPORT_SYMBOL(ata_std_end_eh);
1030
1031
1032/**
Tejun Heo7b70fc02006-05-15 20:58:07 +09001033 * ata_port_schedule_eh - schedule error handling without a qc
1034 * @ap: ATA port to schedule EH for
1035 *
1036 * Schedule error handling for @ap. EH will kick in as soon as
1037 * all commands are drained.
1038 *
1039 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04001040 * spin_lock_irqsave(host lock)
Tejun Heo7b70fc02006-05-15 20:58:07 +09001041 */
1042void ata_port_schedule_eh(struct ata_port *ap)
1043{
Dan Williamse4a9c372012-06-21 23:25:27 -07001044 /* see: ata_std_sched_eh, unless you know better */
1045 ap->ops->sched_eh(ap);
Tejun Heo7b70fc02006-05-15 20:58:07 +09001046}
1047
Tejun Heodbd82612007-08-06 18:36:23 +09001048static int ata_do_link_abort(struct ata_port *ap, struct ata_link *link)
Tejun Heo7b70fc02006-05-15 20:58:07 +09001049{
1050 int tag, nr_aborted = 0;
1051
1052 WARN_ON(!ap->ops->error_handler);
1053
Tejun Heo5ddf24c2007-07-16 14:29:41 +09001054 /* we're gonna abort all commands, no need for fast drain */
1055 ata_eh_set_pending(ap, 0);
1056
Tejun Heo7b70fc02006-05-15 20:58:07 +09001057 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
1058 struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag);
1059
Tejun Heodbd82612007-08-06 18:36:23 +09001060 if (qc && (!link || qc->dev->link == link)) {
Tejun Heo7b70fc02006-05-15 20:58:07 +09001061 qc->flags |= ATA_QCFLAG_FAILED;
1062 ata_qc_complete(qc);
1063 nr_aborted++;
1064 }
1065 }
1066
1067 if (!nr_aborted)
1068 ata_port_schedule_eh(ap);
1069
1070 return nr_aborted;
1071}
1072
Tejun Heoe3180492006-05-15 20:58:09 +09001073/**
Tejun Heodbd82612007-08-06 18:36:23 +09001074 * ata_link_abort - abort all qc's on the link
1075 * @link: ATA link to abort qc's for
1076 *
1077 * Abort all active qc's active on @link and schedule EH.
1078 *
1079 * LOCKING:
1080 * spin_lock_irqsave(host lock)
1081 *
1082 * RETURNS:
1083 * Number of aborted qc's.
1084 */
1085int ata_link_abort(struct ata_link *link)
1086{
1087 return ata_do_link_abort(link->ap, link);
1088}
1089
1090/**
1091 * ata_port_abort - abort all qc's on the port
1092 * @ap: ATA port to abort qc's for
1093 *
1094 * Abort all active qc's of @ap and schedule EH.
1095 *
1096 * LOCKING:
1097 * spin_lock_irqsave(host_set lock)
1098 *
1099 * RETURNS:
1100 * Number of aborted qc's.
1101 */
1102int ata_port_abort(struct ata_port *ap)
1103{
1104 return ata_do_link_abort(ap, NULL);
1105}
1106
1107/**
Tejun Heoe3180492006-05-15 20:58:09 +09001108 * __ata_port_freeze - freeze port
1109 * @ap: ATA port to freeze
1110 *
1111 * This function is called when HSM violation or some other
1112 * condition disrupts normal operation of the port. Frozen port
1113 * is not allowed to perform any operation until the port is
1114 * thawed, which usually follows a successful reset.
1115 *
1116 * ap->ops->freeze() callback can be used for freezing the port
1117 * hardware-wise (e.g. mask interrupt and stop DMA engine). If a
1118 * port cannot be frozen hardware-wise, the interrupt handler
1119 * must ack and clear interrupts unconditionally while the port
1120 * is frozen.
1121 *
1122 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04001123 * spin_lock_irqsave(host lock)
Tejun Heoe3180492006-05-15 20:58:09 +09001124 */
1125static void __ata_port_freeze(struct ata_port *ap)
1126{
1127 WARN_ON(!ap->ops->error_handler);
1128
1129 if (ap->ops->freeze)
1130 ap->ops->freeze(ap);
1131
Tejun Heob51e9e52006-06-29 01:29:30 +09001132 ap->pflags |= ATA_PFLAG_FROZEN;
Tejun Heoe3180492006-05-15 20:58:09 +09001133
Tejun Heo44877b42007-02-21 01:06:51 +09001134 DPRINTK("ata%u port frozen\n", ap->print_id);
Tejun Heoe3180492006-05-15 20:58:09 +09001135}
1136
1137/**
1138 * ata_port_freeze - abort & freeze port
1139 * @ap: ATA port to freeze
1140 *
Jeff Garzik54c38442009-04-07 19:13:15 -04001141 * Abort and freeze @ap. The freeze operation must be called
1142 * first, because some hardware requires special operations
1143 * before the taskfile registers are accessible.
Tejun Heoe3180492006-05-15 20:58:09 +09001144 *
1145 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04001146 * spin_lock_irqsave(host lock)
Tejun Heoe3180492006-05-15 20:58:09 +09001147 *
1148 * RETURNS:
1149 * Number of aborted commands.
1150 */
1151int ata_port_freeze(struct ata_port *ap)
1152{
1153 int nr_aborted;
1154
1155 WARN_ON(!ap->ops->error_handler);
1156
Tejun Heoe3180492006-05-15 20:58:09 +09001157 __ata_port_freeze(ap);
Jeff Garzik54c38442009-04-07 19:13:15 -04001158 nr_aborted = ata_port_abort(ap);
Tejun Heoe3180492006-05-15 20:58:09 +09001159
1160 return nr_aborted;
1161}
1162
1163/**
Tejun Heo7d77b242007-09-23 13:14:13 +09001164 * sata_async_notification - SATA async notification handler
1165 * @ap: ATA port where async notification is received
1166 *
1167 * Handler to be called when async notification via SDB FIS is
1168 * received. This function schedules EH if necessary.
1169 *
1170 * LOCKING:
1171 * spin_lock_irqsave(host lock)
1172 *
1173 * RETURNS:
1174 * 1 if EH is scheduled, 0 otherwise.
1175 */
1176int sata_async_notification(struct ata_port *ap)
1177{
1178 u32 sntf;
1179 int rc;
1180
1181 if (!(ap->flags & ATA_FLAG_AN))
1182 return 0;
1183
1184 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
1185 if (rc == 0)
1186 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
1187
Tejun Heo071f44b2008-04-07 22:47:22 +09001188 if (!sata_pmp_attached(ap) || rc) {
Tejun Heo7d77b242007-09-23 13:14:13 +09001189 /* PMP is not attached or SNTF is not available */
Tejun Heo071f44b2008-04-07 22:47:22 +09001190 if (!sata_pmp_attached(ap)) {
Tejun Heo7d77b242007-09-23 13:14:13 +09001191 /* PMP is not attached. Check whether ATAPI
1192 * AN is configured. If so, notify media
1193 * change.
1194 */
1195 struct ata_device *dev = ap->link.device;
1196
1197 if ((dev->class == ATA_DEV_ATAPI) &&
1198 (dev->flags & ATA_DFLAG_AN))
1199 ata_scsi_media_change_notify(dev);
1200 return 0;
1201 } else {
1202 /* PMP is attached but SNTF is not available.
1203 * ATAPI async media change notification is
1204 * not used. The PMP must be reporting PHY
1205 * status change, schedule EH.
1206 */
1207 ata_port_schedule_eh(ap);
1208 return 1;
1209 }
1210 } else {
1211 /* PMP is attached and SNTF is available */
1212 struct ata_link *link;
1213
1214 /* check and notify ATAPI AN */
Tejun Heo1eca4362008-11-03 20:03:17 +09001215 ata_for_each_link(link, ap, EDGE) {
Tejun Heo7d77b242007-09-23 13:14:13 +09001216 if (!(sntf & (1 << link->pmp)))
1217 continue;
1218
1219 if ((link->device->class == ATA_DEV_ATAPI) &&
1220 (link->device->flags & ATA_DFLAG_AN))
1221 ata_scsi_media_change_notify(link->device);
1222 }
1223
1224 /* If PMP is reporting that PHY status of some
1225 * downstream ports has changed, schedule EH.
1226 */
1227 if (sntf & (1 << SATA_PMP_CTRL_PORT)) {
1228 ata_port_schedule_eh(ap);
1229 return 1;
1230 }
1231
1232 return 0;
1233 }
1234}
1235
1236/**
Tejun Heoe3180492006-05-15 20:58:09 +09001237 * ata_eh_freeze_port - EH helper to freeze port
1238 * @ap: ATA port to freeze
1239 *
1240 * Freeze @ap.
1241 *
1242 * LOCKING:
1243 * None.
1244 */
1245void ata_eh_freeze_port(struct ata_port *ap)
1246{
1247 unsigned long flags;
1248
1249 if (!ap->ops->error_handler)
1250 return;
1251
Jeff Garzikba6a1302006-06-22 23:46:10 -04001252 spin_lock_irqsave(ap->lock, flags);
Tejun Heoe3180492006-05-15 20:58:09 +09001253 __ata_port_freeze(ap);
Jeff Garzikba6a1302006-06-22 23:46:10 -04001254 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoe3180492006-05-15 20:58:09 +09001255}
1256
1257/**
1258 * ata_port_thaw_port - EH helper to thaw port
1259 * @ap: ATA port to thaw
1260 *
1261 * Thaw frozen port @ap.
1262 *
1263 * LOCKING:
1264 * None.
1265 */
1266void ata_eh_thaw_port(struct ata_port *ap)
1267{
1268 unsigned long flags;
1269
1270 if (!ap->ops->error_handler)
1271 return;
1272
Jeff Garzikba6a1302006-06-22 23:46:10 -04001273 spin_lock_irqsave(ap->lock, flags);
Tejun Heoe3180492006-05-15 20:58:09 +09001274
Tejun Heob51e9e52006-06-29 01:29:30 +09001275 ap->pflags &= ~ATA_PFLAG_FROZEN;
Tejun Heoe3180492006-05-15 20:58:09 +09001276
1277 if (ap->ops->thaw)
1278 ap->ops->thaw(ap);
1279
Jeff Garzikba6a1302006-06-22 23:46:10 -04001280 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoe3180492006-05-15 20:58:09 +09001281
Tejun Heo44877b42007-02-21 01:06:51 +09001282 DPRINTK("ata%u port thawed\n", ap->print_id);
Tejun Heoe3180492006-05-15 20:58:09 +09001283}
1284
Tejun Heoece1d632006-04-02 18:51:53 +09001285static void ata_eh_scsidone(struct scsi_cmnd *scmd)
1286{
1287 /* nada */
1288}
1289
1290static void __ata_eh_qc_complete(struct ata_queued_cmd *qc)
1291{
1292 struct ata_port *ap = qc->ap;
1293 struct scsi_cmnd *scmd = qc->scsicmd;
1294 unsigned long flags;
1295
Jeff Garzikba6a1302006-06-22 23:46:10 -04001296 spin_lock_irqsave(ap->lock, flags);
Tejun Heoece1d632006-04-02 18:51:53 +09001297 qc->scsidone = ata_eh_scsidone;
1298 __ata_qc_complete(qc);
1299 WARN_ON(ata_tag_valid(qc->tag));
Jeff Garzikba6a1302006-06-22 23:46:10 -04001300 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoece1d632006-04-02 18:51:53 +09001301
1302 scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
1303}
1304
1305/**
1306 * ata_eh_qc_complete - Complete an active ATA command from EH
1307 * @qc: Command to complete
1308 *
1309 * Indicate to the mid and upper layers that an ATA command has
1310 * completed. To be used from EH.
1311 */
1312void ata_eh_qc_complete(struct ata_queued_cmd *qc)
1313{
1314 struct scsi_cmnd *scmd = qc->scsicmd;
1315 scmd->retries = scmd->allowed;
1316 __ata_eh_qc_complete(qc);
1317}
1318
1319/**
1320 * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
1321 * @qc: Command to retry
1322 *
1323 * Indicate to the mid and upper layers that an ATA command
1324 * should be retried. To be used from EH.
1325 *
1326 * SCSI midlayer limits the number of retries to scmd->allowed.
Gwendal Grignouf13e2202009-08-07 16:17:49 -07001327 * scmd->allowed is incremented for commands which get retried
Tejun Heoece1d632006-04-02 18:51:53 +09001328 * due to unrelated failures (qc->err_mask is zero).
1329 */
1330void ata_eh_qc_retry(struct ata_queued_cmd *qc)
1331{
1332 struct scsi_cmnd *scmd = qc->scsicmd;
Gwendal Grignouf13e2202009-08-07 16:17:49 -07001333 if (!qc->err_mask)
1334 scmd->allowed++;
Tejun Heoece1d632006-04-02 18:51:53 +09001335 __ata_eh_qc_complete(qc);
1336}
Tejun Heo022bdb02006-05-15 20:58:22 +09001337
1338/**
Tejun Heo678afac2009-01-29 20:31:30 +09001339 * ata_dev_disable - disable ATA device
1340 * @dev: ATA device to disable
1341 *
1342 * Disable @dev.
1343 *
1344 * Locking:
1345 * EH context.
1346 */
1347void ata_dev_disable(struct ata_device *dev)
1348{
1349 if (!ata_dev_enabled(dev))
1350 return;
1351
1352 if (ata_msg_drv(dev->link->ap))
Joe Perchesa9a79df2011-04-15 15:51:59 -07001353 ata_dev_warn(dev, "disabled\n");
Tejun Heo678afac2009-01-29 20:31:30 +09001354 ata_acpi_on_disable(dev);
1355 ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 | ATA_DNXFER_QUIET);
1356 dev->class++;
Tejun Heo99cf6102009-01-29 20:31:32 +09001357
1358 /* From now till the next successful probe, ering is used to
1359 * track probe failures. Clear accumulated device error info.
1360 */
1361 ata_ering_clear(&dev->ering);
Tejun Heo678afac2009-01-29 20:31:30 +09001362}
1363
1364/**
Tejun Heo0ea035a2006-05-31 18:28:01 +09001365 * ata_eh_detach_dev - detach ATA device
1366 * @dev: ATA device to detach
1367 *
1368 * Detach @dev.
1369 *
1370 * LOCKING:
1371 * None.
1372 */
Tejun Heofb7fd612007-09-23 13:14:12 +09001373void ata_eh_detach_dev(struct ata_device *dev)
Tejun Heo0ea035a2006-05-31 18:28:01 +09001374{
Tejun Heof58229f2007-08-06 18:36:23 +09001375 struct ata_link *link = dev->link;
1376 struct ata_port *ap = link->ap;
Tejun Heo90484eb2008-10-26 15:43:03 +09001377 struct ata_eh_context *ehc = &link->eh_context;
Tejun Heo0ea035a2006-05-31 18:28:01 +09001378 unsigned long flags;
1379
1380 ata_dev_disable(dev);
1381
Jeff Garzikba6a1302006-06-22 23:46:10 -04001382 spin_lock_irqsave(ap->lock, flags);
Tejun Heo0ea035a2006-05-31 18:28:01 +09001383
1384 dev->flags &= ~ATA_DFLAG_DETACH;
1385
1386 if (ata_scsi_offline_dev(dev)) {
1387 dev->flags |= ATA_DFLAG_DETACHED;
Tejun Heob51e9e52006-06-29 01:29:30 +09001388 ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG;
Tejun Heo0ea035a2006-05-31 18:28:01 +09001389 }
1390
Tejun Heo90484eb2008-10-26 15:43:03 +09001391 /* clear per-dev EH info */
Tejun Heof58229f2007-08-06 18:36:23 +09001392 ata_eh_clear_action(link, dev, &link->eh_info, ATA_EH_PERDEV_MASK);
1393 ata_eh_clear_action(link, dev, &link->eh_context.i, ATA_EH_PERDEV_MASK);
Tejun Heo90484eb2008-10-26 15:43:03 +09001394 ehc->saved_xfer_mode[dev->devno] = 0;
1395 ehc->saved_ncq_enabled &= ~(1 << dev->devno);
Tejun Heobeb07c12006-06-24 20:30:19 +09001396
Jeff Garzikba6a1302006-06-22 23:46:10 -04001397 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heo0ea035a2006-05-31 18:28:01 +09001398}
1399
1400/**
Tejun Heo022bdb02006-05-15 20:58:22 +09001401 * ata_eh_about_to_do - about to perform eh_action
Tejun Heo955e57d2007-08-06 18:36:23 +09001402 * @link: target ATA link
Tejun Heo47005f22006-06-19 18:27:23 +09001403 * @dev: target ATA dev for per-dev action (can be NULL)
Tejun Heo022bdb02006-05-15 20:58:22 +09001404 * @action: action about to be performed
1405 *
1406 * Called just before performing EH actions to clear related bits
Tejun Heo955e57d2007-08-06 18:36:23 +09001407 * in @link->eh_info such that eh actions are not unnecessarily
1408 * repeated.
Tejun Heo022bdb02006-05-15 20:58:22 +09001409 *
1410 * LOCKING:
1411 * None.
1412 */
Tejun Heofb7fd612007-09-23 13:14:12 +09001413void ata_eh_about_to_do(struct ata_link *link, struct ata_device *dev,
1414 unsigned int action)
Tejun Heo022bdb02006-05-15 20:58:22 +09001415{
Tejun Heo955e57d2007-08-06 18:36:23 +09001416 struct ata_port *ap = link->ap;
1417 struct ata_eh_info *ehi = &link->eh_info;
1418 struct ata_eh_context *ehc = &link->eh_context;
Tejun Heo022bdb02006-05-15 20:58:22 +09001419 unsigned long flags;
1420
Jeff Garzikba6a1302006-06-22 23:46:10 -04001421 spin_lock_irqsave(ap->lock, flags);
Tejun Heo1cdaf532006-07-03 16:07:26 +09001422
Tejun Heo955e57d2007-08-06 18:36:23 +09001423 ata_eh_clear_action(link, dev, ehi, action);
Tejun Heo13abf502006-07-10 23:18:46 +09001424
Tejun Heoa568d1d2008-10-21 20:37:21 +09001425 /* About to take EH action, set RECOVERED. Ignore actions on
1426 * slave links as master will do them again.
1427 */
1428 if (!(ehc->i.flags & ATA_EHI_QUIET) && link != ap->slave_link)
Tejun Heo1cdaf532006-07-03 16:07:26 +09001429 ap->pflags |= ATA_PFLAG_RECOVERED;
1430
Jeff Garzikba6a1302006-06-22 23:46:10 -04001431 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heo022bdb02006-05-15 20:58:22 +09001432}
1433
1434/**
Tejun Heo47005f22006-06-19 18:27:23 +09001435 * ata_eh_done - EH action complete
Tejun Heo955e57d2007-08-06 18:36:23 +09001436* @ap: target ATA port
Tejun Heo47005f22006-06-19 18:27:23 +09001437 * @dev: target ATA dev for per-dev action (can be NULL)
1438 * @action: action just completed
1439 *
1440 * Called right after performing EH actions to clear related bits
Tejun Heo955e57d2007-08-06 18:36:23 +09001441 * in @link->eh_context.
Tejun Heo47005f22006-06-19 18:27:23 +09001442 *
1443 * LOCKING:
1444 * None.
1445 */
Tejun Heofb7fd612007-09-23 13:14:12 +09001446void ata_eh_done(struct ata_link *link, struct ata_device *dev,
1447 unsigned int action)
Tejun Heo47005f22006-06-19 18:27:23 +09001448{
Tejun Heo955e57d2007-08-06 18:36:23 +09001449 struct ata_eh_context *ehc = &link->eh_context;
Tejun Heo9af5c9c2007-08-06 18:36:22 +09001450
Tejun Heo955e57d2007-08-06 18:36:23 +09001451 ata_eh_clear_action(link, dev, &ehc->i, action);
Tejun Heo47005f22006-06-19 18:27:23 +09001452}
1453
1454/**
Tejun Heo022bdb02006-05-15 20:58:22 +09001455 * ata_err_string - convert err_mask to descriptive string
1456 * @err_mask: error mask to convert to string
1457 *
1458 * Convert @err_mask to descriptive string. Errors are
1459 * prioritized according to severity and only the most severe
1460 * error is reported.
1461 *
1462 * LOCKING:
1463 * None.
1464 *
1465 * RETURNS:
1466 * Descriptive string for @err_mask
1467 */
Jeff Garzik2dcb4072007-10-19 06:42:56 -04001468static const char *ata_err_string(unsigned int err_mask)
Tejun Heo022bdb02006-05-15 20:58:22 +09001469{
1470 if (err_mask & AC_ERR_HOST_BUS)
1471 return "host bus error";
1472 if (err_mask & AC_ERR_ATA_BUS)
1473 return "ATA bus error";
1474 if (err_mask & AC_ERR_TIMEOUT)
1475 return "timeout";
1476 if (err_mask & AC_ERR_HSM)
1477 return "HSM violation";
1478 if (err_mask & AC_ERR_SYSTEM)
1479 return "internal error";
1480 if (err_mask & AC_ERR_MEDIA)
1481 return "media error";
1482 if (err_mask & AC_ERR_INVALID)
1483 return "invalid argument";
1484 if (err_mask & AC_ERR_DEV)
1485 return "device error";
1486 return "unknown error";
1487}
1488
1489/**
Tejun Heoe8ee8452006-05-15 21:03:46 +09001490 * ata_read_log_page - read a specific log page
1491 * @dev: target device
Shane Huang65fe1f02012-09-07 22:40:01 +08001492 * @log: log to read
Tejun Heoe8ee8452006-05-15 21:03:46 +09001493 * @page: page to read
1494 * @buf: buffer to store read page
1495 * @sectors: number of sectors to read
1496 *
1497 * Read log page using READ_LOG_EXT command.
1498 *
1499 * LOCKING:
1500 * Kernel thread context (may sleep).
1501 *
1502 * RETURNS:
1503 * 0 on success, AC_ERR_* mask otherwise.
1504 */
Shane Huang65fe1f02012-09-07 22:40:01 +08001505unsigned int ata_read_log_page(struct ata_device *dev, u8 log,
1506 u8 page, void *buf, unsigned int sectors)
Tejun Heoe8ee8452006-05-15 21:03:46 +09001507{
Andreas Wernerea013a92015-12-04 18:12:49 +01001508 unsigned long ap_flags = dev->link->ap->flags;
Tejun Heoe8ee8452006-05-15 21:03:46 +09001509 struct ata_taskfile tf;
1510 unsigned int err_mask;
Martin K. Petersen5d3abf82015-05-04 21:54:21 -04001511 bool dma = false;
Tejun Heoe8ee8452006-05-15 21:03:46 +09001512
Shane Huang65fe1f02012-09-07 22:40:01 +08001513 DPRINTK("read log page - log 0x%x, page 0x%x\n", log, page);
Tejun Heoe8ee8452006-05-15 21:03:46 +09001514
Andreas Wernerea013a92015-12-04 18:12:49 +01001515 /*
1516 * Return error without actually issuing the command on controllers
1517 * which e.g. lockup on a read log page.
1518 */
1519 if (ap_flags & ATA_FLAG_NO_LOG_PAGE)
1520 return AC_ERR_DEV;
1521
Martin K. Petersen5d3abf82015-05-04 21:54:21 -04001522retry:
Tejun Heoe8ee8452006-05-15 21:03:46 +09001523 ata_tf_init(dev, &tf);
Martin K. Petersen5d3abf82015-05-04 21:54:21 -04001524 if (dev->dma_mode && ata_id_has_read_log_dma_ext(dev->id) &&
1525 !(dev->horkage & ATA_HORKAGE_NO_NCQ_LOG)) {
Hannes Reinecke9faa6432015-03-27 16:46:30 +01001526 tf.command = ATA_CMD_READ_LOG_DMA_EXT;
1527 tf.protocol = ATA_PROT_DMA;
Martin K. Petersen5d3abf82015-05-04 21:54:21 -04001528 dma = true;
Hannes Reinecke9faa6432015-03-27 16:46:30 +01001529 } else {
1530 tf.command = ATA_CMD_READ_LOG_EXT;
1531 tf.protocol = ATA_PROT_PIO;
Martin K. Peterseneab6ee12015-05-19 19:44:17 -04001532 dma = false;
Hannes Reinecke9faa6432015-03-27 16:46:30 +01001533 }
Shane Huang65fe1f02012-09-07 22:40:01 +08001534 tf.lbal = log;
1535 tf.lbam = page;
Tejun Heoe8ee8452006-05-15 21:03:46 +09001536 tf.nsect = sectors;
1537 tf.hob_nsect = sectors >> 8;
1538 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_LBA48 | ATA_TFLAG_DEVICE;
Tejun Heoe8ee8452006-05-15 21:03:46 +09001539
1540 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
Tejun Heo2b789102007-10-09 15:05:44 +09001541 buf, sectors * ATA_SECT_SIZE, 0);
Tejun Heoe8ee8452006-05-15 21:03:46 +09001542
Martin K. Petersen5d3abf82015-05-04 21:54:21 -04001543 if (err_mask && dma) {
1544 dev->horkage |= ATA_HORKAGE_NO_NCQ_LOG;
1545 ata_dev_warn(dev, "READ LOG DMA EXT failed, trying unqueued\n");
1546 goto retry;
1547 }
1548
Tejun Heoe8ee8452006-05-15 21:03:46 +09001549 DPRINTK("EXIT, err_mask=%x\n", err_mask);
1550 return err_mask;
1551}
1552
1553/**
1554 * ata_eh_read_log_10h - Read log page 10h for NCQ error details
1555 * @dev: Device to read log page 10h from
1556 * @tag: Resulting tag of the failed command
1557 * @tf: Resulting taskfile registers of the failed command
1558 *
1559 * Read log page 10h to obtain NCQ error details and clear error
1560 * condition.
1561 *
1562 * LOCKING:
1563 * Kernel thread context (may sleep).
1564 *
1565 * RETURNS:
1566 * 0 on success, -errno otherwise.
1567 */
1568static int ata_eh_read_log_10h(struct ata_device *dev,
1569 int *tag, struct ata_taskfile *tf)
1570{
Tejun Heo9af5c9c2007-08-06 18:36:22 +09001571 u8 *buf = dev->link->ap->sector_buf;
Tejun Heoe8ee8452006-05-15 21:03:46 +09001572 unsigned int err_mask;
1573 u8 csum;
1574 int i;
1575
Shane Huang65fe1f02012-09-07 22:40:01 +08001576 err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, 0, buf, 1);
Tejun Heoe8ee8452006-05-15 21:03:46 +09001577 if (err_mask)
1578 return -EIO;
1579
1580 csum = 0;
1581 for (i = 0; i < ATA_SECT_SIZE; i++)
1582 csum += buf[i];
1583 if (csum)
Joe Perchesa9a79df2011-04-15 15:51:59 -07001584 ata_dev_warn(dev, "invalid checksum 0x%x on log page 10h\n",
1585 csum);
Tejun Heoe8ee8452006-05-15 21:03:46 +09001586
1587 if (buf[0] & 0x80)
1588 return -ENOENT;
1589
1590 *tag = buf[0] & 0x1f;
1591
1592 tf->command = buf[2];
1593 tf->feature = buf[3];
1594 tf->lbal = buf[4];
1595 tf->lbam = buf[5];
1596 tf->lbah = buf[6];
1597 tf->device = buf[7];
1598 tf->hob_lbal = buf[8];
1599 tf->hob_lbam = buf[9];
1600 tf->hob_lbah = buf[10];
1601 tf->nsect = buf[12];
1602 tf->hob_nsect = buf[13];
1603
1604 return 0;
1605}
1606
1607/**
Tejun Heo11fc33d2008-08-30 14:20:01 +02001608 * atapi_eh_tur - perform ATAPI TEST_UNIT_READY
1609 * @dev: target ATAPI device
1610 * @r_sense_key: out parameter for sense_key
1611 *
1612 * Perform ATAPI TEST_UNIT_READY.
1613 *
1614 * LOCKING:
1615 * EH context (may sleep).
1616 *
1617 * RETURNS:
1618 * 0 on success, AC_ERR_* mask on failure.
1619 */
Aaron Lu3dc67442013-01-15 17:21:00 +08001620unsigned int atapi_eh_tur(struct ata_device *dev, u8 *r_sense_key)
Tejun Heo11fc33d2008-08-30 14:20:01 +02001621{
1622 u8 cdb[ATAPI_CDB_LEN] = { TEST_UNIT_READY, 0, 0, 0, 0, 0 };
1623 struct ata_taskfile tf;
1624 unsigned int err_mask;
1625
1626 ata_tf_init(dev, &tf);
1627
1628 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1629 tf.command = ATA_CMD_PACKET;
1630 tf.protocol = ATAPI_PROT_NODATA;
1631
1632 err_mask = ata_exec_internal(dev, &tf, cdb, DMA_NONE, NULL, 0, 0);
1633 if (err_mask == AC_ERR_DEV)
1634 *r_sense_key = tf.feature >> 4;
1635 return err_mask;
1636}
1637
1638/**
Tejun Heo022bdb02006-05-15 20:58:22 +09001639 * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE
1640 * @dev: device to perform REQUEST_SENSE to
1641 * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long)
Tejun Heo3eabddb2008-06-10 18:28:05 +09001642 * @dfl_sense_key: default sense key to use
Tejun Heo022bdb02006-05-15 20:58:22 +09001643 *
1644 * Perform ATAPI REQUEST_SENSE after the device reported CHECK
1645 * SENSE. This function is EH helper.
1646 *
1647 * LOCKING:
1648 * Kernel thread context (may sleep).
1649 *
1650 * RETURNS:
1651 * 0 on success, AC_ERR_* mask on failure
1652 */
Aaron Lu3dc67442013-01-15 17:21:00 +08001653unsigned int atapi_eh_request_sense(struct ata_device *dev,
Tejun Heo3eabddb2008-06-10 18:28:05 +09001654 u8 *sense_buf, u8 dfl_sense_key)
Tejun Heo022bdb02006-05-15 20:58:22 +09001655{
Tejun Heo3eabddb2008-06-10 18:28:05 +09001656 u8 cdb[ATAPI_CDB_LEN] =
1657 { REQUEST_SENSE, 0, 0, 0, SCSI_SENSE_BUFFERSIZE, 0 };
Tejun Heo9af5c9c2007-08-06 18:36:22 +09001658 struct ata_port *ap = dev->link->ap;
Tejun Heo022bdb02006-05-15 20:58:22 +09001659 struct ata_taskfile tf;
Tejun Heo022bdb02006-05-15 20:58:22 +09001660
1661 DPRINTK("ATAPI request sense\n");
1662
Tejun Heo022bdb02006-05-15 20:58:22 +09001663 memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
1664
Albert Lee56287762007-04-02 11:30:46 +08001665 /* initialize sense_buf with the error register,
1666 * for the case where they are -not- overwritten
1667 */
Tejun Heo022bdb02006-05-15 20:58:22 +09001668 sense_buf[0] = 0x70;
Tejun Heo3eabddb2008-06-10 18:28:05 +09001669 sense_buf[2] = dfl_sense_key;
Albert Lee56287762007-04-02 11:30:46 +08001670
Jeff Garzika617c092007-05-21 20:14:23 -04001671 /* some devices time out if garbage left in tf */
Albert Lee56287762007-04-02 11:30:46 +08001672 ata_tf_init(dev, &tf);
Tejun Heo022bdb02006-05-15 20:58:22 +09001673
Tejun Heo022bdb02006-05-15 20:58:22 +09001674 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1675 tf.command = ATA_CMD_PACKET;
1676
1677 /* is it pointless to prefer PIO for "safety reasons"? */
1678 if (ap->flags & ATA_FLAG_PIO_DMA) {
Tejun Heo0dc36882007-12-18 16:34:43 -05001679 tf.protocol = ATAPI_PROT_DMA;
Tejun Heo022bdb02006-05-15 20:58:22 +09001680 tf.feature |= ATAPI_PKT_DMA;
1681 } else {
Tejun Heo0dc36882007-12-18 16:34:43 -05001682 tf.protocol = ATAPI_PROT_PIO;
Tejun Heof2dfc1a2007-12-12 12:12:46 +09001683 tf.lbam = SCSI_SENSE_BUFFERSIZE;
1684 tf.lbah = 0;
Tejun Heo022bdb02006-05-15 20:58:22 +09001685 }
1686
1687 return ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE,
Tejun Heo2b789102007-10-09 15:05:44 +09001688 sense_buf, SCSI_SENSE_BUFFERSIZE, 0);
Tejun Heo022bdb02006-05-15 20:58:22 +09001689}
1690
1691/**
1692 * ata_eh_analyze_serror - analyze SError for a failed port
Tejun Heo02607312007-08-06 18:36:23 +09001693 * @link: ATA link to analyze SError for
Tejun Heo022bdb02006-05-15 20:58:22 +09001694 *
1695 * Analyze SError if available and further determine cause of
1696 * failure.
1697 *
1698 * LOCKING:
1699 * None.
1700 */
Tejun Heo02607312007-08-06 18:36:23 +09001701static void ata_eh_analyze_serror(struct ata_link *link)
Tejun Heo022bdb02006-05-15 20:58:22 +09001702{
Tejun Heo02607312007-08-06 18:36:23 +09001703 struct ata_eh_context *ehc = &link->eh_context;
Tejun Heo022bdb02006-05-15 20:58:22 +09001704 u32 serror = ehc->i.serror;
1705 unsigned int err_mask = 0, action = 0;
Tejun Heof9df58c2007-09-23 13:14:13 +09001706 u32 hotplug_mask;
Tejun Heo022bdb02006-05-15 20:58:22 +09001707
Tejun Heoe0614db2008-05-19 01:15:09 +09001708 if (serror & (SERR_PERSISTENT | SERR_DATA)) {
Tejun Heo022bdb02006-05-15 20:58:22 +09001709 err_mask |= AC_ERR_ATA_BUS;
Tejun Heocf480622008-01-24 00:05:14 +09001710 action |= ATA_EH_RESET;
Tejun Heo022bdb02006-05-15 20:58:22 +09001711 }
1712 if (serror & SERR_PROTOCOL) {
1713 err_mask |= AC_ERR_HSM;
Tejun Heocf480622008-01-24 00:05:14 +09001714 action |= ATA_EH_RESET;
Tejun Heo022bdb02006-05-15 20:58:22 +09001715 }
1716 if (serror & SERR_INTERNAL) {
1717 err_mask |= AC_ERR_SYSTEM;
Tejun Heocf480622008-01-24 00:05:14 +09001718 action |= ATA_EH_RESET;
Tejun Heo022bdb02006-05-15 20:58:22 +09001719 }
Tejun Heof9df58c2007-09-23 13:14:13 +09001720
1721 /* Determine whether a hotplug event has occurred. Both
1722 * SError.N/X are considered hotplug events for enabled or
1723 * host links. For disabled PMP links, only N bit is
1724 * considered as X bit is left at 1 for link plugging.
1725 */
Tejun Heoeb0e85e2011-02-24 19:30:37 +01001726 if (link->lpm_policy > ATA_LPM_MAX_POWER)
Tejun Heo6b7ae952010-09-01 17:50:06 +02001727 hotplug_mask = 0; /* hotplug doesn't work w/ LPM */
1728 else if (!(link->flags & ATA_LFLAG_DISABLED) || ata_is_host_link(link))
Tejun Heof9df58c2007-09-23 13:14:13 +09001729 hotplug_mask = SERR_PHYRDY_CHG | SERR_DEV_XCHG;
1730 else
1731 hotplug_mask = SERR_PHYRDY_CHG;
1732
1733 if (serror & hotplug_mask)
Tejun Heo084fe632006-05-31 18:28:03 +09001734 ata_ehi_hotplugged(&ehc->i);
Tejun Heo022bdb02006-05-15 20:58:22 +09001735
1736 ehc->i.err_mask |= err_mask;
1737 ehc->i.action |= action;
1738}
1739
1740/**
Tejun Heoe8ee8452006-05-15 21:03:46 +09001741 * ata_eh_analyze_ncq_error - analyze NCQ error
Tejun Heo02607312007-08-06 18:36:23 +09001742 * @link: ATA link to analyze NCQ error for
Tejun Heoe8ee8452006-05-15 21:03:46 +09001743 *
1744 * Read log page 10h, determine the offending qc and acquire
1745 * error status TF. For NCQ device errors, all LLDDs have to do
1746 * is setting AC_ERR_DEV in ehi->err_mask. This function takes
1747 * care of the rest.
1748 *
1749 * LOCKING:
1750 * Kernel thread context (may sleep).
1751 */
Mark Lord10acf3b2008-05-02 02:14:53 -04001752void ata_eh_analyze_ncq_error(struct ata_link *link)
Tejun Heoe8ee8452006-05-15 21:03:46 +09001753{
Tejun Heo02607312007-08-06 18:36:23 +09001754 struct ata_port *ap = link->ap;
1755 struct ata_eh_context *ehc = &link->eh_context;
1756 struct ata_device *dev = link->device;
Tejun Heoe8ee8452006-05-15 21:03:46 +09001757 struct ata_queued_cmd *qc;
1758 struct ata_taskfile tf;
1759 int tag, rc;
1760
1761 /* if frozen, we can't do much */
Tejun Heob51e9e52006-06-29 01:29:30 +09001762 if (ap->pflags & ATA_PFLAG_FROZEN)
Tejun Heoe8ee8452006-05-15 21:03:46 +09001763 return;
1764
1765 /* is it NCQ device error? */
Tejun Heo02607312007-08-06 18:36:23 +09001766 if (!link->sactive || !(ehc->i.err_mask & AC_ERR_DEV))
Tejun Heoe8ee8452006-05-15 21:03:46 +09001767 return;
1768
1769 /* has LLDD analyzed already? */
1770 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
1771 qc = __ata_qc_from_tag(ap, tag);
1772
1773 if (!(qc->flags & ATA_QCFLAG_FAILED))
1774 continue;
1775
1776 if (qc->err_mask)
1777 return;
1778 }
1779
1780 /* okay, this error is ours */
Jeff Garzika09bf4c2010-04-22 21:59:13 -04001781 memset(&tf, 0, sizeof(tf));
Tejun Heoe8ee8452006-05-15 21:03:46 +09001782 rc = ata_eh_read_log_10h(dev, &tag, &tf);
1783 if (rc) {
Joe Perchesa9a79df2011-04-15 15:51:59 -07001784 ata_link_err(link, "failed to read log page 10h (errno=%d)\n",
1785 rc);
Tejun Heoe8ee8452006-05-15 21:03:46 +09001786 return;
1787 }
1788
Tejun Heo02607312007-08-06 18:36:23 +09001789 if (!(link->sactive & (1 << tag))) {
Joe Perchesa9a79df2011-04-15 15:51:59 -07001790 ata_link_err(link, "log page 10h reported inactive tag %d\n",
1791 tag);
Tejun Heoe8ee8452006-05-15 21:03:46 +09001792 return;
1793 }
1794
1795 /* we've got the perpetrator, condemn it */
1796 qc = __ata_qc_from_tag(ap, tag);
1797 memcpy(&qc->result_tf, &tf, sizeof(tf));
Mark Lorda6116c92008-04-23 22:36:25 -04001798 qc->result_tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
Tejun Heo5335b722007-07-16 14:29:40 +09001799 qc->err_mask |= AC_ERR_DEV | AC_ERR_NCQ;
Tejun Heoe8ee8452006-05-15 21:03:46 +09001800 ehc->i.err_mask &= ~AC_ERR_DEV;
1801}
1802
1803/**
Tejun Heo022bdb02006-05-15 20:58:22 +09001804 * ata_eh_analyze_tf - analyze taskfile of a failed qc
1805 * @qc: qc to analyze
1806 * @tf: Taskfile registers to analyze
1807 *
1808 * Analyze taskfile of @qc and further determine cause of
1809 * failure. This function also requests ATAPI sense data if
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001810 * available.
Tejun Heo022bdb02006-05-15 20:58:22 +09001811 *
1812 * LOCKING:
1813 * Kernel thread context (may sleep).
1814 *
1815 * RETURNS:
1816 * Determined recovery action
1817 */
1818static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd *qc,
1819 const struct ata_taskfile *tf)
1820{
1821 unsigned int tmp, action = 0;
1822 u8 stat = tf->command, err = tf->feature;
1823
1824 if ((stat & (ATA_BUSY | ATA_DRQ | ATA_DRDY)) != ATA_DRDY) {
1825 qc->err_mask |= AC_ERR_HSM;
Tejun Heocf480622008-01-24 00:05:14 +09001826 return ATA_EH_RESET;
Tejun Heo022bdb02006-05-15 20:58:22 +09001827 }
1828
Tejun Heoa51d6442007-03-20 15:24:11 +09001829 if (stat & (ATA_ERR | ATA_DF))
1830 qc->err_mask |= AC_ERR_DEV;
1831 else
Tejun Heo022bdb02006-05-15 20:58:22 +09001832 return 0;
1833
1834 switch (qc->dev->class) {
1835 case ATA_DEV_ATA:
Hannes Reinecke9162c652014-11-05 13:08:21 +01001836 case ATA_DEV_ZAC:
Tejun Heo022bdb02006-05-15 20:58:22 +09001837 if (err & ATA_ICRC)
1838 qc->err_mask |= AC_ERR_ATA_BUS;
Alexey Asemoveec7e1c2014-07-15 10:28:42 +04001839 if (err & (ATA_UNC | ATA_AMNF))
Tejun Heo022bdb02006-05-15 20:58:22 +09001840 qc->err_mask |= AC_ERR_MEDIA;
1841 if (err & ATA_IDNF)
1842 qc->err_mask |= AC_ERR_INVALID;
1843 break;
1844
1845 case ATA_DEV_ATAPI:
Tejun Heoa569a302006-11-21 10:40:51 +09001846 if (!(qc->ap->pflags & ATA_PFLAG_FROZEN)) {
Tejun Heo3eabddb2008-06-10 18:28:05 +09001847 tmp = atapi_eh_request_sense(qc->dev,
1848 qc->scsicmd->sense_buffer,
1849 qc->result_tf.feature >> 4);
Tejun Heoa569a302006-11-21 10:40:51 +09001850 if (!tmp) {
1851 /* ATA_QCFLAG_SENSE_VALID is used to
1852 * tell atapi_qc_complete() that sense
1853 * data is already valid.
1854 *
1855 * TODO: interpret sense data and set
1856 * appropriate err_mask.
1857 */
1858 qc->flags |= ATA_QCFLAG_SENSE_VALID;
1859 } else
1860 qc->err_mask |= tmp;
1861 }
Tejun Heo022bdb02006-05-15 20:58:22 +09001862 }
1863
1864 if (qc->err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT | AC_ERR_ATA_BUS))
Tejun Heocf480622008-01-24 00:05:14 +09001865 action |= ATA_EH_RESET;
Tejun Heo022bdb02006-05-15 20:58:22 +09001866
1867 return action;
1868}
1869
Tejun Heo76326ac2007-11-27 19:28:59 +09001870static int ata_eh_categorize_error(unsigned int eflags, unsigned int err_mask,
1871 int *xfer_ok)
Tejun Heo022bdb02006-05-15 20:58:22 +09001872{
Tejun Heo76326ac2007-11-27 19:28:59 +09001873 int base = 0;
1874
1875 if (!(eflags & ATA_EFLAG_DUBIOUS_XFER))
1876 *xfer_ok = 1;
1877
1878 if (!*xfer_ok)
Tejun Heo75f9caf2008-01-03 01:21:14 +09001879 base = ATA_ECAT_DUBIOUS_NONE;
Tejun Heo76326ac2007-11-27 19:28:59 +09001880
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001881 if (err_mask & AC_ERR_ATA_BUS)
Tejun Heo76326ac2007-11-27 19:28:59 +09001882 return base + ATA_ECAT_ATA_BUS;
Tejun Heo022bdb02006-05-15 20:58:22 +09001883
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001884 if (err_mask & AC_ERR_TIMEOUT)
Tejun Heo76326ac2007-11-27 19:28:59 +09001885 return base + ATA_ECAT_TOUT_HSM;
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001886
Tejun Heo3884f7b2007-11-27 19:28:56 +09001887 if (eflags & ATA_EFLAG_IS_IO) {
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001888 if (err_mask & AC_ERR_HSM)
Tejun Heo76326ac2007-11-27 19:28:59 +09001889 return base + ATA_ECAT_TOUT_HSM;
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001890 if ((err_mask &
1891 (AC_ERR_DEV|AC_ERR_MEDIA|AC_ERR_INVALID)) == AC_ERR_DEV)
Tejun Heo76326ac2007-11-27 19:28:59 +09001892 return base + ATA_ECAT_UNK_DEV;
Tejun Heo022bdb02006-05-15 20:58:22 +09001893 }
1894
1895 return 0;
1896}
1897
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001898struct speed_down_verdict_arg {
Tejun Heo022bdb02006-05-15 20:58:22 +09001899 u64 since;
Tejun Heo76326ac2007-11-27 19:28:59 +09001900 int xfer_ok;
Tejun Heo3884f7b2007-11-27 19:28:56 +09001901 int nr_errors[ATA_ECAT_NR];
Tejun Heo022bdb02006-05-15 20:58:22 +09001902};
1903
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001904static int speed_down_verdict_cb(struct ata_ering_entry *ent, void *void_arg)
Tejun Heo022bdb02006-05-15 20:58:22 +09001905{
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001906 struct speed_down_verdict_arg *arg = void_arg;
Tejun Heo76326ac2007-11-27 19:28:59 +09001907 int cat;
Tejun Heo022bdb02006-05-15 20:58:22 +09001908
Gwendal Grignoud9027472010-05-25 12:31:38 -07001909 if ((ent->eflags & ATA_EFLAG_OLD_ER) || (ent->timestamp < arg->since))
Tejun Heo022bdb02006-05-15 20:58:22 +09001910 return -1;
1911
Tejun Heo76326ac2007-11-27 19:28:59 +09001912 cat = ata_eh_categorize_error(ent->eflags, ent->err_mask,
1913 &arg->xfer_ok);
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001914 arg->nr_errors[cat]++;
Tejun Heo76326ac2007-11-27 19:28:59 +09001915
Tejun Heo022bdb02006-05-15 20:58:22 +09001916 return 0;
1917}
1918
1919/**
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001920 * ata_eh_speed_down_verdict - Determine speed down verdict
Tejun Heo022bdb02006-05-15 20:58:22 +09001921 * @dev: Device of interest
1922 *
1923 * This function examines error ring of @dev and determines
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001924 * whether NCQ needs to be turned off, transfer speed should be
1925 * stepped down, or falling back to PIO is necessary.
Tejun Heo022bdb02006-05-15 20:58:22 +09001926 *
Tejun Heo3884f7b2007-11-27 19:28:56 +09001927 * ECAT_ATA_BUS : ATA_BUS error for any command
Tejun Heo022bdb02006-05-15 20:58:22 +09001928 *
Tejun Heo3884f7b2007-11-27 19:28:56 +09001929 * ECAT_TOUT_HSM : TIMEOUT for any command or HSM violation for
1930 * IO commands
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001931 *
Tejun Heo3884f7b2007-11-27 19:28:56 +09001932 * ECAT_UNK_DEV : Unknown DEV error for IO commands
Tejun Heo022bdb02006-05-15 20:58:22 +09001933 *
Tejun Heo76326ac2007-11-27 19:28:59 +09001934 * ECAT_DUBIOUS_* : Identical to above three but occurred while
1935 * data transfer hasn't been verified.
1936 *
Tejun Heo3884f7b2007-11-27 19:28:56 +09001937 * Verdicts are
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001938 *
Tejun Heo3884f7b2007-11-27 19:28:56 +09001939 * NCQ_OFF : Turn off NCQ.
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001940 *
Tejun Heo3884f7b2007-11-27 19:28:56 +09001941 * SPEED_DOWN : Speed down transfer speed but don't fall back
1942 * to PIO.
1943 *
1944 * FALLBACK_TO_PIO : Fall back to PIO.
1945 *
1946 * Even if multiple verdicts are returned, only one action is
Tejun Heo76326ac2007-11-27 19:28:59 +09001947 * taken per error. An action triggered by non-DUBIOUS errors
1948 * clears ering, while one triggered by DUBIOUS_* errors doesn't.
1949 * This is to expedite speed down decisions right after device is
1950 * initially configured.
Tejun Heo3884f7b2007-11-27 19:28:56 +09001951 *
Tejun Heo76326ac2007-11-27 19:28:59 +09001952 * The followings are speed down rules. #1 and #2 deal with
1953 * DUBIOUS errors.
1954 *
1955 * 1. If more than one DUBIOUS_ATA_BUS or DUBIOUS_TOUT_HSM errors
1956 * occurred during last 5 mins, SPEED_DOWN and FALLBACK_TO_PIO.
1957 *
1958 * 2. If more than one DUBIOUS_TOUT_HSM or DUBIOUS_UNK_DEV errors
1959 * occurred during last 5 mins, NCQ_OFF.
1960 *
1961 * 3. If more than 8 ATA_BUS, TOUT_HSM or UNK_DEV errors
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001962 * occurred during last 5 mins, FALLBACK_TO_PIO
Tejun Heo3884f7b2007-11-27 19:28:56 +09001963 *
Tejun Heo76326ac2007-11-27 19:28:59 +09001964 * 4. If more than 3 TOUT_HSM or UNK_DEV errors occurred
Tejun Heo3884f7b2007-11-27 19:28:56 +09001965 * during last 10 mins, NCQ_OFF.
1966 *
Tejun Heo76326ac2007-11-27 19:28:59 +09001967 * 5. If more than 3 ATA_BUS or TOUT_HSM errors, or more than 6
Tejun Heo3884f7b2007-11-27 19:28:56 +09001968 * UNK_DEV errors occurred during last 10 mins, SPEED_DOWN.
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001969 *
Tejun Heo022bdb02006-05-15 20:58:22 +09001970 * LOCKING:
1971 * Inherited from caller.
1972 *
1973 * RETURNS:
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001974 * OR of ATA_EH_SPDN_* flags.
Tejun Heo022bdb02006-05-15 20:58:22 +09001975 */
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001976static unsigned int ata_eh_speed_down_verdict(struct ata_device *dev)
Tejun Heo022bdb02006-05-15 20:58:22 +09001977{
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001978 const u64 j5mins = 5LLU * 60 * HZ, j10mins = 10LLU * 60 * HZ;
1979 u64 j64 = get_jiffies_64();
1980 struct speed_down_verdict_arg arg;
1981 unsigned int verdict = 0;
Tejun Heo022bdb02006-05-15 20:58:22 +09001982
Tejun Heo3884f7b2007-11-27 19:28:56 +09001983 /* scan past 5 mins of error history */
1984 memset(&arg, 0, sizeof(arg));
1985 arg.since = j64 - min(j64, j5mins);
1986 ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg);
1987
Tejun Heo76326ac2007-11-27 19:28:59 +09001988 if (arg.nr_errors[ATA_ECAT_DUBIOUS_ATA_BUS] +
1989 arg.nr_errors[ATA_ECAT_DUBIOUS_TOUT_HSM] > 1)
1990 verdict |= ATA_EH_SPDN_SPEED_DOWN |
1991 ATA_EH_SPDN_FALLBACK_TO_PIO | ATA_EH_SPDN_KEEP_ERRORS;
1992
1993 if (arg.nr_errors[ATA_ECAT_DUBIOUS_TOUT_HSM] +
1994 arg.nr_errors[ATA_ECAT_DUBIOUS_UNK_DEV] > 1)
1995 verdict |= ATA_EH_SPDN_NCQ_OFF | ATA_EH_SPDN_KEEP_ERRORS;
1996
Tejun Heo3884f7b2007-11-27 19:28:56 +09001997 if (arg.nr_errors[ATA_ECAT_ATA_BUS] +
1998 arg.nr_errors[ATA_ECAT_TOUT_HSM] +
Tejun Heo663f99b2007-11-27 19:28:57 +09001999 arg.nr_errors[ATA_ECAT_UNK_DEV] > 6)
Tejun Heo3884f7b2007-11-27 19:28:56 +09002000 verdict |= ATA_EH_SPDN_FALLBACK_TO_PIO;
2001
Tejun Heo7d47e8d2007-02-02 16:22:31 +09002002 /* scan past 10 mins of error history */
Tejun Heo022bdb02006-05-15 20:58:22 +09002003 memset(&arg, 0, sizeof(arg));
Tejun Heo7d47e8d2007-02-02 16:22:31 +09002004 arg.since = j64 - min(j64, j10mins);
2005 ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg);
Tejun Heo022bdb02006-05-15 20:58:22 +09002006
Tejun Heo3884f7b2007-11-27 19:28:56 +09002007 if (arg.nr_errors[ATA_ECAT_TOUT_HSM] +
2008 arg.nr_errors[ATA_ECAT_UNK_DEV] > 3)
Tejun Heo7d47e8d2007-02-02 16:22:31 +09002009 verdict |= ATA_EH_SPDN_NCQ_OFF;
Tejun Heo3884f7b2007-11-27 19:28:56 +09002010
2011 if (arg.nr_errors[ATA_ECAT_ATA_BUS] +
2012 arg.nr_errors[ATA_ECAT_TOUT_HSM] > 3 ||
Tejun Heo663f99b2007-11-27 19:28:57 +09002013 arg.nr_errors[ATA_ECAT_UNK_DEV] > 6)
Tejun Heo7d47e8d2007-02-02 16:22:31 +09002014 verdict |= ATA_EH_SPDN_SPEED_DOWN;
Tejun Heo022bdb02006-05-15 20:58:22 +09002015
Tejun Heo7d47e8d2007-02-02 16:22:31 +09002016 return verdict;
Tejun Heo022bdb02006-05-15 20:58:22 +09002017}
2018
2019/**
2020 * ata_eh_speed_down - record error and speed down if necessary
2021 * @dev: Failed device
Tejun Heo3884f7b2007-11-27 19:28:56 +09002022 * @eflags: mask of ATA_EFLAG_* flags
Tejun Heo022bdb02006-05-15 20:58:22 +09002023 * @err_mask: err_mask of the error
2024 *
2025 * Record error and examine error history to determine whether
2026 * adjusting transmission speed is necessary. It also sets
2027 * transmission limits appropriately if such adjustment is
2028 * necessary.
2029 *
2030 * LOCKING:
2031 * Kernel thread context (may sleep).
2032 *
2033 * RETURNS:
Tejun Heo7d47e8d2007-02-02 16:22:31 +09002034 * Determined recovery action.
Tejun Heo022bdb02006-05-15 20:58:22 +09002035 */
Tejun Heo3884f7b2007-11-27 19:28:56 +09002036static unsigned int ata_eh_speed_down(struct ata_device *dev,
2037 unsigned int eflags, unsigned int err_mask)
Tejun Heo022bdb02006-05-15 20:58:22 +09002038{
Tejun Heob1c72912008-07-31 17:02:43 +09002039 struct ata_link *link = ata_dev_phys_link(dev);
Tejun Heo76326ac2007-11-27 19:28:59 +09002040 int xfer_ok = 0;
Tejun Heo7d47e8d2007-02-02 16:22:31 +09002041 unsigned int verdict;
2042 unsigned int action = 0;
2043
2044 /* don't bother if Cat-0 error */
Tejun Heo76326ac2007-11-27 19:28:59 +09002045 if (ata_eh_categorize_error(eflags, err_mask, &xfer_ok) == 0)
Tejun Heo022bdb02006-05-15 20:58:22 +09002046 return 0;
2047
2048 /* record error and determine whether speed down is necessary */
Tejun Heo3884f7b2007-11-27 19:28:56 +09002049 ata_ering_record(&dev->ering, eflags, err_mask);
Tejun Heo7d47e8d2007-02-02 16:22:31 +09002050 verdict = ata_eh_speed_down_verdict(dev);
Tejun Heo022bdb02006-05-15 20:58:22 +09002051
Tejun Heo7d47e8d2007-02-02 16:22:31 +09002052 /* turn off NCQ? */
2053 if ((verdict & ATA_EH_SPDN_NCQ_OFF) &&
2054 (dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ |
2055 ATA_DFLAG_NCQ_OFF)) == ATA_DFLAG_NCQ) {
2056 dev->flags |= ATA_DFLAG_NCQ_OFF;
Joe Perchesa9a79df2011-04-15 15:51:59 -07002057 ata_dev_warn(dev, "NCQ disabled due to excessive errors\n");
Tejun Heo7d47e8d2007-02-02 16:22:31 +09002058 goto done;
2059 }
Tejun Heo022bdb02006-05-15 20:58:22 +09002060
Tejun Heo7d47e8d2007-02-02 16:22:31 +09002061 /* speed down? */
2062 if (verdict & ATA_EH_SPDN_SPEED_DOWN) {
2063 /* speed down SATA link speed if possible */
Tejun Heoa07d4992009-01-29 20:31:33 +09002064 if (sata_down_spd_limit(link, 0) == 0) {
Tejun Heocf480622008-01-24 00:05:14 +09002065 action |= ATA_EH_RESET;
Tejun Heo7d47e8d2007-02-02 16:22:31 +09002066 goto done;
2067 }
Tejun Heo022bdb02006-05-15 20:58:22 +09002068
Tejun Heo7d47e8d2007-02-02 16:22:31 +09002069 /* lower transfer mode */
2070 if (dev->spdn_cnt < 2) {
2071 static const int dma_dnxfer_sel[] =
2072 { ATA_DNXFER_DMA, ATA_DNXFER_40C };
2073 static const int pio_dnxfer_sel[] =
2074 { ATA_DNXFER_PIO, ATA_DNXFER_FORCE_PIO0 };
2075 int sel;
Tejun Heo022bdb02006-05-15 20:58:22 +09002076
Tejun Heo7d47e8d2007-02-02 16:22:31 +09002077 if (dev->xfer_shift != ATA_SHIFT_PIO)
2078 sel = dma_dnxfer_sel[dev->spdn_cnt];
2079 else
2080 sel = pio_dnxfer_sel[dev->spdn_cnt];
2081
2082 dev->spdn_cnt++;
2083
2084 if (ata_down_xfermask_limit(dev, sel) == 0) {
Tejun Heocf480622008-01-24 00:05:14 +09002085 action |= ATA_EH_RESET;
Tejun Heo7d47e8d2007-02-02 16:22:31 +09002086 goto done;
2087 }
2088 }
2089 }
2090
2091 /* Fall back to PIO? Slowing down to PIO is meaningless for
Tejun Heo663f99b2007-11-27 19:28:57 +09002092 * SATA ATA devices. Consider it only for PATA and SATAPI.
Tejun Heo7d47e8d2007-02-02 16:22:31 +09002093 */
2094 if ((verdict & ATA_EH_SPDN_FALLBACK_TO_PIO) && (dev->spdn_cnt >= 2) &&
Tejun Heo663f99b2007-11-27 19:28:57 +09002095 (link->ap->cbl != ATA_CBL_SATA || dev->class == ATA_DEV_ATAPI) &&
Tejun Heo7d47e8d2007-02-02 16:22:31 +09002096 (dev->xfer_shift != ATA_SHIFT_PIO)) {
2097 if (ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO) == 0) {
2098 dev->spdn_cnt = 0;
Tejun Heocf480622008-01-24 00:05:14 +09002099 action |= ATA_EH_RESET;
Tejun Heo7d47e8d2007-02-02 16:22:31 +09002100 goto done;
2101 }
2102 }
2103
Tejun Heo022bdb02006-05-15 20:58:22 +09002104 return 0;
Tejun Heo7d47e8d2007-02-02 16:22:31 +09002105 done:
2106 /* device has been slowed down, blow error history */
Tejun Heo76326ac2007-11-27 19:28:59 +09002107 if (!(verdict & ATA_EH_SPDN_KEEP_ERRORS))
2108 ata_ering_clear(&dev->ering);
Tejun Heo7d47e8d2007-02-02 16:22:31 +09002109 return action;
Tejun Heo022bdb02006-05-15 20:58:22 +09002110}
2111
2112/**
Mark Lord8d899e72012-05-02 15:22:52 -04002113 * ata_eh_worth_retry - analyze error and decide whether to retry
2114 * @qc: qc to possibly retry
2115 *
2116 * Look at the cause of the error and decide if a retry
2117 * might be useful or not. We don't want to retry media errors
2118 * because the drive itself has probably already taken 10-30 seconds
2119 * doing its own internal retries before reporting the failure.
2120 */
2121static inline int ata_eh_worth_retry(struct ata_queued_cmd *qc)
2122{
Bian Yu1eaca392012-12-12 22:26:58 -05002123 if (qc->err_mask & AC_ERR_MEDIA)
Mark Lord8d899e72012-05-02 15:22:52 -04002124 return 0; /* don't retry media errors */
2125 if (qc->flags & ATA_QCFLAG_IO)
2126 return 1; /* otherwise retry anything from fs stack */
2127 if (qc->err_mask & AC_ERR_INVALID)
2128 return 0; /* don't retry these */
2129 return qc->err_mask != AC_ERR_DEV; /* retry if not dev error */
2130}
2131
2132/**
Tejun Heo9b1e2652007-08-06 18:36:24 +09002133 * ata_eh_link_autopsy - analyze error and determine recovery action
2134 * @link: host link to perform autopsy on
Tejun Heo022bdb02006-05-15 20:58:22 +09002135 *
Tejun Heo02607312007-08-06 18:36:23 +09002136 * Analyze why @link failed and determine which recovery actions
2137 * are needed. This function also sets more detailed AC_ERR_*
2138 * values and fills sense data for ATAPI CHECK SENSE.
Tejun Heo022bdb02006-05-15 20:58:22 +09002139 *
2140 * LOCKING:
2141 * Kernel thread context (may sleep).
2142 */
Tejun Heo9b1e2652007-08-06 18:36:24 +09002143static void ata_eh_link_autopsy(struct ata_link *link)
Tejun Heo022bdb02006-05-15 20:58:22 +09002144{
Tejun Heo02607312007-08-06 18:36:23 +09002145 struct ata_port *ap = link->ap;
Tejun Heo936fd732007-08-06 18:36:23 +09002146 struct ata_eh_context *ehc = &link->eh_context;
Tejun Heodfcc1732007-10-31 10:17:05 +09002147 struct ata_device *dev;
Tejun Heo3884f7b2007-11-27 19:28:56 +09002148 unsigned int all_err_mask = 0, eflags = 0;
2149 int tag;
Tejun Heo022bdb02006-05-15 20:58:22 +09002150 u32 serror;
2151 int rc;
2152
2153 DPRINTK("ENTER\n");
2154
Tejun Heo1cdaf532006-07-03 16:07:26 +09002155 if (ehc->i.flags & ATA_EHI_NO_AUTOPSY)
2156 return;
2157
Tejun Heo022bdb02006-05-15 20:58:22 +09002158 /* obtain and analyze SError */
Tejun Heo936fd732007-08-06 18:36:23 +09002159 rc = sata_scr_read(link, SCR_ERROR, &serror);
Tejun Heo022bdb02006-05-15 20:58:22 +09002160 if (rc == 0) {
2161 ehc->i.serror |= serror;
Tejun Heo02607312007-08-06 18:36:23 +09002162 ata_eh_analyze_serror(link);
Tejun Heo4e57c512007-07-16 14:29:41 +09002163 } else if (rc != -EOPNOTSUPP) {
Tejun Heocf480622008-01-24 00:05:14 +09002164 /* SError read failed, force reset and probing */
Tejun Heob558edd2008-01-24 00:05:14 +09002165 ehc->i.probe_mask |= ATA_ALL_DEVICES;
Tejun Heocf480622008-01-24 00:05:14 +09002166 ehc->i.action |= ATA_EH_RESET;
Tejun Heo4e57c512007-07-16 14:29:41 +09002167 ehc->i.err_mask |= AC_ERR_OTHER;
2168 }
Tejun Heo022bdb02006-05-15 20:58:22 +09002169
Tejun Heoe8ee8452006-05-15 21:03:46 +09002170 /* analyze NCQ failure */
Tejun Heo02607312007-08-06 18:36:23 +09002171 ata_eh_analyze_ncq_error(link);
Tejun Heoe8ee8452006-05-15 21:03:46 +09002172
Tejun Heo022bdb02006-05-15 20:58:22 +09002173 /* any real error trumps AC_ERR_OTHER */
2174 if (ehc->i.err_mask & ~AC_ERR_OTHER)
2175 ehc->i.err_mask &= ~AC_ERR_OTHER;
2176
2177 all_err_mask |= ehc->i.err_mask;
2178
2179 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
2180 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
2181
Tejun Heob1c72912008-07-31 17:02:43 +09002182 if (!(qc->flags & ATA_QCFLAG_FAILED) ||
2183 ata_dev_phys_link(qc->dev) != link)
Tejun Heo022bdb02006-05-15 20:58:22 +09002184 continue;
2185
2186 /* inherit upper level err_mask */
2187 qc->err_mask |= ehc->i.err_mask;
2188
Tejun Heo022bdb02006-05-15 20:58:22 +09002189 /* analyze TF */
Tejun Heo4528e4d2006-07-08 20:17:26 +09002190 ehc->i.action |= ata_eh_analyze_tf(qc, &qc->result_tf);
Tejun Heo022bdb02006-05-15 20:58:22 +09002191
2192 /* DEV errors are probably spurious in case of ATA_BUS error */
2193 if (qc->err_mask & AC_ERR_ATA_BUS)
2194 qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_MEDIA |
2195 AC_ERR_INVALID);
2196
2197 /* any real error trumps unknown error */
2198 if (qc->err_mask & ~AC_ERR_OTHER)
2199 qc->err_mask &= ~AC_ERR_OTHER;
2200
2201 /* SENSE_VALID trumps dev/unknown error and revalidation */
Tejun Heof90f0822007-10-26 16:12:41 +09002202 if (qc->flags & ATA_QCFLAG_SENSE_VALID)
Tejun Heo022bdb02006-05-15 20:58:22 +09002203 qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_OTHER);
Tejun Heo022bdb02006-05-15 20:58:22 +09002204
Tejun Heo03faab72008-03-27 19:14:24 +09002205 /* determine whether the command is worth retrying */
Mark Lord8d899e72012-05-02 15:22:52 -04002206 if (ata_eh_worth_retry(qc))
Tejun Heo03faab72008-03-27 19:14:24 +09002207 qc->flags |= ATA_QCFLAG_RETRY;
2208
Tejun Heo022bdb02006-05-15 20:58:22 +09002209 /* accumulate error info */
Tejun Heo4528e4d2006-07-08 20:17:26 +09002210 ehc->i.dev = qc->dev;
Tejun Heo022bdb02006-05-15 20:58:22 +09002211 all_err_mask |= qc->err_mask;
2212 if (qc->flags & ATA_QCFLAG_IO)
Tejun Heo3884f7b2007-11-27 19:28:56 +09002213 eflags |= ATA_EFLAG_IS_IO;
Hannes Reinecke255c03d2015-03-27 16:46:38 +01002214 trace_ata_eh_link_autopsy_qc(qc);
Tejun Heo022bdb02006-05-15 20:58:22 +09002215 }
2216
Tejun Heoa20f33f2006-05-16 12:58:24 +09002217 /* enforce default EH actions */
Tejun Heob51e9e52006-06-29 01:29:30 +09002218 if (ap->pflags & ATA_PFLAG_FROZEN ||
Tejun Heoa20f33f2006-05-16 12:58:24 +09002219 all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT))
Tejun Heocf480622008-01-24 00:05:14 +09002220 ehc->i.action |= ATA_EH_RESET;
Tejun Heo3884f7b2007-11-27 19:28:56 +09002221 else if (((eflags & ATA_EFLAG_IS_IO) && all_err_mask) ||
2222 (!(eflags & ATA_EFLAG_IS_IO) && (all_err_mask & ~AC_ERR_DEV)))
Tejun Heo4528e4d2006-07-08 20:17:26 +09002223 ehc->i.action |= ATA_EH_REVALIDATE;
Tejun Heo022bdb02006-05-15 20:58:22 +09002224
Tejun Heodfcc1732007-10-31 10:17:05 +09002225 /* If we have offending qcs and the associated failed device,
2226 * perform per-dev EH action only on the offending device.
2227 */
Tejun Heo4528e4d2006-07-08 20:17:26 +09002228 if (ehc->i.dev) {
Tejun Heo4528e4d2006-07-08 20:17:26 +09002229 ehc->i.dev_action[ehc->i.dev->devno] |=
2230 ehc->i.action & ATA_EH_PERDEV_MASK;
2231 ehc->i.action &= ~ATA_EH_PERDEV_MASK;
Tejun Heo47005f22006-06-19 18:27:23 +09002232 }
2233
Tejun Heo2695e362008-01-10 13:41:23 +09002234 /* propagate timeout to host link */
2235 if ((all_err_mask & AC_ERR_TIMEOUT) && !ata_is_host_link(link))
2236 ap->link.eh_context.i.err_mask |= AC_ERR_TIMEOUT;
2237
2238 /* record error and consider speeding down */
Tejun Heodfcc1732007-10-31 10:17:05 +09002239 dev = ehc->i.dev;
Tejun Heo2695e362008-01-10 13:41:23 +09002240 if (!dev && ((ata_link_max_devices(link) == 1 &&
2241 ata_dev_enabled(link->device))))
2242 dev = link->device;
Tejun Heodfcc1732007-10-31 10:17:05 +09002243
Tejun Heo76326ac2007-11-27 19:28:59 +09002244 if (dev) {
2245 if (dev->flags & ATA_DFLAG_DUBIOUS_XFER)
2246 eflags |= ATA_EFLAG_DUBIOUS_XFER;
Tejun Heo3884f7b2007-11-27 19:28:56 +09002247 ehc->i.action |= ata_eh_speed_down(dev, eflags, all_err_mask);
Tejun Heo76326ac2007-11-27 19:28:59 +09002248 }
Hannes Reinecke255c03d2015-03-27 16:46:38 +01002249 trace_ata_eh_link_autopsy(dev, ehc->i.action, all_err_mask);
Tejun Heo022bdb02006-05-15 20:58:22 +09002250 DPRINTK("EXIT\n");
2251}
2252
2253/**
Tejun Heo9b1e2652007-08-06 18:36:24 +09002254 * ata_eh_autopsy - analyze error and determine recovery action
2255 * @ap: host port to perform autopsy on
2256 *
2257 * Analyze all links of @ap and determine why they failed and
2258 * which recovery actions are needed.
2259 *
2260 * LOCKING:
2261 * Kernel thread context (may sleep).
2262 */
Tejun Heofb7fd612007-09-23 13:14:12 +09002263void ata_eh_autopsy(struct ata_port *ap)
Tejun Heo9b1e2652007-08-06 18:36:24 +09002264{
2265 struct ata_link *link;
2266
Tejun Heo1eca4362008-11-03 20:03:17 +09002267 ata_for_each_link(link, ap, EDGE)
Tejun Heo9b1e2652007-08-06 18:36:24 +09002268 ata_eh_link_autopsy(link);
Tejun Heo2695e362008-01-10 13:41:23 +09002269
Tejun Heob1c72912008-07-31 17:02:43 +09002270 /* Handle the frigging slave link. Autopsy is done similarly
2271 * but actions and flags are transferred over to the master
2272 * link and handled from there.
2273 */
2274 if (ap->slave_link) {
2275 struct ata_eh_context *mehc = &ap->link.eh_context;
2276 struct ata_eh_context *sehc = &ap->slave_link->eh_context;
2277
Tejun Heo848e4c62008-10-21 14:26:39 +09002278 /* transfer control flags from master to slave */
2279 sehc->i.flags |= mehc->i.flags & ATA_EHI_TO_SLAVE_MASK;
2280
2281 /* perform autopsy on the slave link */
Tejun Heob1c72912008-07-31 17:02:43 +09002282 ata_eh_link_autopsy(ap->slave_link);
2283
Tejun Heo848e4c62008-10-21 14:26:39 +09002284 /* transfer actions from slave to master and clear slave */
Tejun Heob1c72912008-07-31 17:02:43 +09002285 ata_eh_about_to_do(ap->slave_link, NULL, ATA_EH_ALL_ACTIONS);
2286 mehc->i.action |= sehc->i.action;
2287 mehc->i.dev_action[1] |= sehc->i.dev_action[1];
2288 mehc->i.flags |= sehc->i.flags;
2289 ata_eh_done(ap->slave_link, NULL, ATA_EH_ALL_ACTIONS);
2290 }
2291
Tejun Heo2695e362008-01-10 13:41:23 +09002292 /* Autopsy of fanout ports can affect host link autopsy.
2293 * Perform host link autopsy last.
2294 */
Tejun Heo071f44b2008-04-07 22:47:22 +09002295 if (sata_pmp_attached(ap))
Tejun Heo2695e362008-01-10 13:41:23 +09002296 ata_eh_link_autopsy(&ap->link);
Tejun Heo9b1e2652007-08-06 18:36:24 +09002297}
2298
2299/**
Robert Hancock65211482009-07-14 20:43:39 -06002300 * ata_get_cmd_descript - get description for ATA command
2301 * @command: ATA command code to get description for
2302 *
2303 * Return a textual description of the given command, or NULL if the
2304 * command is not known.
2305 *
2306 * LOCKING:
2307 * None
2308 */
2309const char *ata_get_cmd_descript(u8 command)
2310{
2311#ifdef CONFIG_ATA_VERBOSE_ERROR
2312 static const struct
2313 {
2314 u8 command;
2315 const char *text;
2316 } cmd_descr[] = {
2317 { ATA_CMD_DEV_RESET, "DEVICE RESET" },
Hannes Reinecke825e2d82015-03-27 16:46:31 +01002318 { ATA_CMD_CHK_POWER, "CHECK POWER MODE" },
2319 { ATA_CMD_STANDBY, "STANDBY" },
2320 { ATA_CMD_IDLE, "IDLE" },
2321 { ATA_CMD_EDD, "EXECUTE DEVICE DIAGNOSTIC" },
2322 { ATA_CMD_DOWNLOAD_MICRO, "DOWNLOAD MICROCODE" },
Robert Hancock3915c3b2013-10-21 19:26:30 -06002323 { ATA_CMD_DOWNLOAD_MICRO_DMA, "DOWNLOAD MICROCODE DMA" },
Robert Hancock65211482009-07-14 20:43:39 -06002324 { ATA_CMD_NOP, "NOP" },
Hannes Reinecke825e2d82015-03-27 16:46:31 +01002325 { ATA_CMD_FLUSH, "FLUSH CACHE" },
2326 { ATA_CMD_FLUSH_EXT, "FLUSH CACHE EXT" },
2327 { ATA_CMD_ID_ATA, "IDENTIFY DEVICE" },
2328 { ATA_CMD_ID_ATAPI, "IDENTIFY PACKET DEVICE" },
2329 { ATA_CMD_SERVICE, "SERVICE" },
2330 { ATA_CMD_READ, "READ DMA" },
2331 { ATA_CMD_READ_EXT, "READ DMA EXT" },
2332 { ATA_CMD_READ_QUEUED, "READ DMA QUEUED" },
2333 { ATA_CMD_READ_STREAM_EXT, "READ STREAM EXT" },
Robert Hancock65211482009-07-14 20:43:39 -06002334 { ATA_CMD_READ_STREAM_DMA_EXT, "READ STREAM DMA EXT" },
Hannes Reinecke825e2d82015-03-27 16:46:31 +01002335 { ATA_CMD_WRITE, "WRITE DMA" },
2336 { ATA_CMD_WRITE_EXT, "WRITE DMA EXT" },
2337 { ATA_CMD_WRITE_QUEUED, "WRITE DMA QUEUED EXT" },
2338 { ATA_CMD_WRITE_STREAM_EXT, "WRITE STREAM EXT" },
Robert Hancock65211482009-07-14 20:43:39 -06002339 { ATA_CMD_WRITE_STREAM_DMA_EXT, "WRITE STREAM DMA EXT" },
2340 { ATA_CMD_WRITE_FUA_EXT, "WRITE DMA FUA EXT" },
2341 { ATA_CMD_WRITE_QUEUED_FUA_EXT, "WRITE DMA QUEUED FUA EXT" },
2342 { ATA_CMD_FPDMA_READ, "READ FPDMA QUEUED" },
2343 { ATA_CMD_FPDMA_WRITE, "WRITE FPDMA QUEUED" },
Robert Hancock3915c3b2013-10-21 19:26:30 -06002344 { ATA_CMD_FPDMA_SEND, "SEND FPDMA QUEUED" },
2345 { ATA_CMD_FPDMA_RECV, "RECEIVE FPDMA QUEUED" },
Robert Hancock65211482009-07-14 20:43:39 -06002346 { ATA_CMD_PIO_READ, "READ SECTOR(S)" },
2347 { ATA_CMD_PIO_READ_EXT, "READ SECTOR(S) EXT" },
2348 { ATA_CMD_PIO_WRITE, "WRITE SECTOR(S)" },
2349 { ATA_CMD_PIO_WRITE_EXT, "WRITE SECTOR(S) EXT" },
2350 { ATA_CMD_READ_MULTI, "READ MULTIPLE" },
2351 { ATA_CMD_READ_MULTI_EXT, "READ MULTIPLE EXT" },
2352 { ATA_CMD_WRITE_MULTI, "WRITE MULTIPLE" },
2353 { ATA_CMD_WRITE_MULTI_EXT, "WRITE MULTIPLE EXT" },
Hannes Reinecke825e2d82015-03-27 16:46:31 +01002354 { ATA_CMD_WRITE_MULTI_FUA_EXT, "WRITE MULTIPLE FUA EXT" },
Robert Hancock65211482009-07-14 20:43:39 -06002355 { ATA_CMD_SET_FEATURES, "SET FEATURES" },
2356 { ATA_CMD_SET_MULTI, "SET MULTIPLE MODE" },
2357 { ATA_CMD_VERIFY, "READ VERIFY SECTOR(S)" },
2358 { ATA_CMD_VERIFY_EXT, "READ VERIFY SECTOR(S) EXT" },
2359 { ATA_CMD_WRITE_UNCORR_EXT, "WRITE UNCORRECTABLE EXT" },
2360 { ATA_CMD_STANDBYNOW1, "STANDBY IMMEDIATE" },
2361 { ATA_CMD_IDLEIMMEDIATE, "IDLE IMMEDIATE" },
2362 { ATA_CMD_SLEEP, "SLEEP" },
2363 { ATA_CMD_INIT_DEV_PARAMS, "INITIALIZE DEVICE PARAMETERS" },
2364 { ATA_CMD_READ_NATIVE_MAX, "READ NATIVE MAX ADDRESS" },
2365 { ATA_CMD_READ_NATIVE_MAX_EXT, "READ NATIVE MAX ADDRESS EXT" },
2366 { ATA_CMD_SET_MAX, "SET MAX ADDRESS" },
2367 { ATA_CMD_SET_MAX_EXT, "SET MAX ADDRESS EXT" },
2368 { ATA_CMD_READ_LOG_EXT, "READ LOG EXT" },
2369 { ATA_CMD_WRITE_LOG_EXT, "WRITE LOG EXT" },
2370 { ATA_CMD_READ_LOG_DMA_EXT, "READ LOG DMA EXT" },
Hannes Reinecke825e2d82015-03-27 16:46:31 +01002371 { ATA_CMD_WRITE_LOG_DMA_EXT, "WRITE LOG DMA EXT" },
Robert Hancock3915c3b2013-10-21 19:26:30 -06002372 { ATA_CMD_TRUSTED_NONDATA, "TRUSTED NON-DATA" },
Robert Hancock65211482009-07-14 20:43:39 -06002373 { ATA_CMD_TRUSTED_RCV, "TRUSTED RECEIVE" },
Hannes Reinecke825e2d82015-03-27 16:46:31 +01002374 { ATA_CMD_TRUSTED_RCV_DMA, "TRUSTED RECEIVE DMA" },
Robert Hancock65211482009-07-14 20:43:39 -06002375 { ATA_CMD_TRUSTED_SND, "TRUSTED SEND" },
Hannes Reinecke825e2d82015-03-27 16:46:31 +01002376 { ATA_CMD_TRUSTED_SND_DMA, "TRUSTED SEND DMA" },
Robert Hancock65211482009-07-14 20:43:39 -06002377 { ATA_CMD_PMP_READ, "READ BUFFER" },
Robert Hancock3915c3b2013-10-21 19:26:30 -06002378 { ATA_CMD_PMP_READ_DMA, "READ BUFFER DMA" },
Robert Hancock65211482009-07-14 20:43:39 -06002379 { ATA_CMD_PMP_WRITE, "WRITE BUFFER" },
Robert Hancock3915c3b2013-10-21 19:26:30 -06002380 { ATA_CMD_PMP_WRITE_DMA, "WRITE BUFFER DMA" },
Robert Hancock65211482009-07-14 20:43:39 -06002381 { ATA_CMD_CONF_OVERLAY, "DEVICE CONFIGURATION OVERLAY" },
2382 { ATA_CMD_SEC_SET_PASS, "SECURITY SET PASSWORD" },
2383 { ATA_CMD_SEC_UNLOCK, "SECURITY UNLOCK" },
2384 { ATA_CMD_SEC_ERASE_PREP, "SECURITY ERASE PREPARE" },
2385 { ATA_CMD_SEC_ERASE_UNIT, "SECURITY ERASE UNIT" },
2386 { ATA_CMD_SEC_FREEZE_LOCK, "SECURITY FREEZE LOCK" },
2387 { ATA_CMD_SEC_DISABLE_PASS, "SECURITY DISABLE PASSWORD" },
2388 { ATA_CMD_CONFIG_STREAM, "CONFIGURE STREAM" },
2389 { ATA_CMD_SMART, "SMART" },
2390 { ATA_CMD_MEDIA_LOCK, "DOOR LOCK" },
2391 { ATA_CMD_MEDIA_UNLOCK, "DOOR UNLOCK" },
FUJITA Tomonoriacad762722010-07-05 15:45:20 +09002392 { ATA_CMD_DSM, "DATA SET MANAGEMENT" },
Hannes Reinecke825e2d82015-03-27 16:46:31 +01002393 { ATA_CMD_CHK_MED_CRD_TYP, "CHECK MEDIA CARD TYPE" },
2394 { ATA_CMD_CFA_REQ_EXT_ERR, "CFA REQUEST EXTENDED ERROR" },
Robert Hancock65211482009-07-14 20:43:39 -06002395 { ATA_CMD_CFA_WRITE_NE, "CFA WRITE SECTORS WITHOUT ERASE" },
2396 { ATA_CMD_CFA_TRANS_SECT, "CFA TRANSLATE SECTOR" },
2397 { ATA_CMD_CFA_ERASE, "CFA ERASE SECTORS" },
Hannes Reinecke825e2d82015-03-27 16:46:31 +01002398 { ATA_CMD_CFA_WRITE_MULT_NE, "CFA WRITE MULTIPLE WITHOUT ERASE" },
Robert Hancock3915c3b2013-10-21 19:26:30 -06002399 { ATA_CMD_REQ_SENSE_DATA, "REQUEST SENSE DATA EXT" },
2400 { ATA_CMD_SANITIZE_DEVICE, "SANITIZE DEVICE" },
Robert Hancock65211482009-07-14 20:43:39 -06002401 { ATA_CMD_READ_LONG, "READ LONG (with retries)" },
2402 { ATA_CMD_READ_LONG_ONCE, "READ LONG (without retries)" },
2403 { ATA_CMD_WRITE_LONG, "WRITE LONG (with retries)" },
2404 { ATA_CMD_WRITE_LONG_ONCE, "WRITE LONG (without retries)" },
2405 { ATA_CMD_RESTORE, "RECALIBRATE" },
2406 { 0, NULL } /* terminate list */
2407 };
2408
2409 unsigned int i;
2410 for (i = 0; cmd_descr[i].text; i++)
2411 if (cmd_descr[i].command == command)
2412 return cmd_descr[i].text;
2413#endif
2414
2415 return NULL;
2416}
Andy Shevchenko36aae282014-12-12 17:16:31 +02002417EXPORT_SYMBOL_GPL(ata_get_cmd_descript);
Robert Hancock65211482009-07-14 20:43:39 -06002418
2419/**
Tejun Heo9b1e2652007-08-06 18:36:24 +09002420 * ata_eh_link_report - report error handling to user
Tejun Heo02607312007-08-06 18:36:23 +09002421 * @link: ATA link EH is going on
Tejun Heo022bdb02006-05-15 20:58:22 +09002422 *
2423 * Report EH to user.
2424 *
2425 * LOCKING:
2426 * None.
2427 */
Tejun Heo9b1e2652007-08-06 18:36:24 +09002428static void ata_eh_link_report(struct ata_link *link)
Tejun Heo022bdb02006-05-15 20:58:22 +09002429{
Tejun Heo02607312007-08-06 18:36:23 +09002430 struct ata_port *ap = link->ap;
2431 struct ata_eh_context *ehc = &link->eh_context;
Tejun Heo022bdb02006-05-15 20:58:22 +09002432 const char *frozen, *desc;
Levente Kurusa462098b2013-10-29 20:01:46 +01002433 char tries_buf[6] = "";
Tejun Heo022bdb02006-05-15 20:58:22 +09002434 int tag, nr_failed = 0;
2435
Tejun Heo94ff3d52007-10-09 14:57:56 +09002436 if (ehc->i.flags & ATA_EHI_QUIET)
2437 return;
2438
Tejun Heo022bdb02006-05-15 20:58:22 +09002439 desc = NULL;
2440 if (ehc->i.desc[0] != '\0')
2441 desc = ehc->i.desc;
2442
2443 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
2444 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
2445
Tejun Heob1c72912008-07-31 17:02:43 +09002446 if (!(qc->flags & ATA_QCFLAG_FAILED) ||
2447 ata_dev_phys_link(qc->dev) != link ||
Tejun Heoe027bd32007-10-26 16:19:26 +09002448 ((qc->flags & ATA_QCFLAG_QUIET) &&
2449 qc->err_mask == AC_ERR_DEV))
Tejun Heo022bdb02006-05-15 20:58:22 +09002450 continue;
2451 if (qc->flags & ATA_QCFLAG_SENSE_VALID && !qc->err_mask)
2452 continue;
2453
2454 nr_failed++;
2455 }
2456
2457 if (!nr_failed && !ehc->i.err_mask)
2458 return;
2459
2460 frozen = "";
Tejun Heob51e9e52006-06-29 01:29:30 +09002461 if (ap->pflags & ATA_PFLAG_FROZEN)
Tejun Heo022bdb02006-05-15 20:58:22 +09002462 frozen = " frozen";
2463
Tejun Heoa1e10f72007-08-18 13:28:49 +09002464 if (ap->eh_tries < ATA_EH_MAX_TRIES)
Levente Kurusa462098b2013-10-29 20:01:46 +01002465 snprintf(tries_buf, sizeof(tries_buf), " t%d",
Tejun Heoa1e10f72007-08-18 13:28:49 +09002466 ap->eh_tries);
2467
Tejun Heo022bdb02006-05-15 20:58:22 +09002468 if (ehc->i.dev) {
Joe Perchesa9a79df2011-04-15 15:51:59 -07002469 ata_dev_err(ehc->i.dev, "exception Emask 0x%x "
2470 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
2471 ehc->i.err_mask, link->sactive, ehc->i.serror,
2472 ehc->i.action, frozen, tries_buf);
Tejun Heo022bdb02006-05-15 20:58:22 +09002473 if (desc)
Joe Perchesa9a79df2011-04-15 15:51:59 -07002474 ata_dev_err(ehc->i.dev, "%s\n", desc);
Tejun Heo022bdb02006-05-15 20:58:22 +09002475 } else {
Joe Perchesa9a79df2011-04-15 15:51:59 -07002476 ata_link_err(link, "exception Emask 0x%x "
2477 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
2478 ehc->i.err_mask, link->sactive, ehc->i.serror,
2479 ehc->i.action, frozen, tries_buf);
Tejun Heo022bdb02006-05-15 20:58:22 +09002480 if (desc)
Joe Perchesa9a79df2011-04-15 15:51:59 -07002481 ata_link_err(link, "%s\n", desc);
Tejun Heo022bdb02006-05-15 20:58:22 +09002482 }
2483
Robert Hancock65211482009-07-14 20:43:39 -06002484#ifdef CONFIG_ATA_VERBOSE_ERROR
Robert Hancock1333e192007-10-02 11:22:02 -04002485 if (ehc->i.serror)
Joe Perchesa9a79df2011-04-15 15:51:59 -07002486 ata_link_err(link,
Robert Hancock1333e192007-10-02 11:22:02 -04002487 "SError: { %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s}\n",
2488 ehc->i.serror & SERR_DATA_RECOVERED ? "RecovData " : "",
2489 ehc->i.serror & SERR_COMM_RECOVERED ? "RecovComm " : "",
2490 ehc->i.serror & SERR_DATA ? "UnrecovData " : "",
2491 ehc->i.serror & SERR_PERSISTENT ? "Persist " : "",
2492 ehc->i.serror & SERR_PROTOCOL ? "Proto " : "",
2493 ehc->i.serror & SERR_INTERNAL ? "HostInt " : "",
2494 ehc->i.serror & SERR_PHYRDY_CHG ? "PHYRdyChg " : "",
2495 ehc->i.serror & SERR_PHY_INT_ERR ? "PHYInt " : "",
2496 ehc->i.serror & SERR_COMM_WAKE ? "CommWake " : "",
2497 ehc->i.serror & SERR_10B_8B_ERR ? "10B8B " : "",
2498 ehc->i.serror & SERR_DISPARITY ? "Dispar " : "",
2499 ehc->i.serror & SERR_CRC ? "BadCRC " : "",
2500 ehc->i.serror & SERR_HANDSHAKE ? "Handshk " : "",
2501 ehc->i.serror & SERR_LINK_SEQ_ERR ? "LinkSeq " : "",
2502 ehc->i.serror & SERR_TRANS_ST_ERROR ? "TrStaTrns " : "",
2503 ehc->i.serror & SERR_UNRECOG_FIS ? "UnrecFIS " : "",
Jeff Garzik2dcb4072007-10-19 06:42:56 -04002504 ehc->i.serror & SERR_DEV_XCHG ? "DevExch " : "");
Robert Hancock65211482009-07-14 20:43:39 -06002505#endif
Robert Hancock1333e192007-10-02 11:22:02 -04002506
Tejun Heo022bdb02006-05-15 20:58:22 +09002507 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
2508 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
Tejun Heo8a937582006-11-14 22:36:12 +09002509 struct ata_taskfile *cmd = &qc->tf, *res = &qc->result_tf;
Tejun Heoabb6a882007-11-28 23:16:09 +09002510 char data_buf[20] = "";
2511 char cdb_buf[70] = "";
Tejun Heo022bdb02006-05-15 20:58:22 +09002512
Tejun Heo02607312007-08-06 18:36:23 +09002513 if (!(qc->flags & ATA_QCFLAG_FAILED) ||
Tejun Heob1c72912008-07-31 17:02:43 +09002514 ata_dev_phys_link(qc->dev) != link || !qc->err_mask)
Tejun Heo022bdb02006-05-15 20:58:22 +09002515 continue;
2516
Tejun Heoabb6a882007-11-28 23:16:09 +09002517 if (qc->dma_dir != DMA_NONE) {
2518 static const char *dma_str[] = {
2519 [DMA_BIDIRECTIONAL] = "bidi",
2520 [DMA_TO_DEVICE] = "out",
2521 [DMA_FROM_DEVICE] = "in",
2522 };
2523 static const char *prot_str[] = {
2524 [ATA_PROT_PIO] = "pio",
2525 [ATA_PROT_DMA] = "dma",
2526 [ATA_PROT_NCQ] = "ncq",
Tejun Heo0dc36882007-12-18 16:34:43 -05002527 [ATAPI_PROT_PIO] = "pio",
2528 [ATAPI_PROT_DMA] = "dma",
Tejun Heoabb6a882007-11-28 23:16:09 +09002529 };
2530
2531 snprintf(data_buf, sizeof(data_buf), " %s %u %s",
2532 prot_str[qc->tf.protocol], qc->nbytes,
2533 dma_str[qc->dma_dir]);
2534 }
2535
Robert Hancock65211482009-07-14 20:43:39 -06002536 if (ata_is_atapi(qc->tf.protocol)) {
Hannes Reineckea13b0c92015-01-19 16:55:38 +01002537 const u8 *cdb = qc->cdb;
2538 size_t cdb_len = qc->dev->cdb_len;
2539
Hannes Reineckecbba5b02015-01-08 07:43:45 +01002540 if (qc->scsicmd) {
2541 cdb = qc->scsicmd->cmnd;
2542 cdb_len = qc->scsicmd->cmd_len;
2543 }
2544 __scsi_format_command(cdb_buf, sizeof(cdb_buf),
2545 cdb, cdb_len);
Robert Hancock65211482009-07-14 20:43:39 -06002546 } else {
2547 const char *descr = ata_get_cmd_descript(cmd->command);
2548 if (descr)
Joe Perchesa9a79df2011-04-15 15:51:59 -07002549 ata_dev_err(qc->dev, "failed command: %s\n",
2550 descr);
Robert Hancock65211482009-07-14 20:43:39 -06002551 }
Tejun Heoabb6a882007-11-28 23:16:09 +09002552
Joe Perchesa9a79df2011-04-15 15:51:59 -07002553 ata_dev_err(qc->dev,
Tejun Heo8a937582006-11-14 22:36:12 +09002554 "cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
Tejun Heoabb6a882007-11-28 23:16:09 +09002555 "tag %d%s\n %s"
Tejun Heo8a937582006-11-14 22:36:12 +09002556 "res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
Tejun Heo5335b722007-07-16 14:29:40 +09002557 "Emask 0x%x (%s)%s\n",
Tejun Heo8a937582006-11-14 22:36:12 +09002558 cmd->command, cmd->feature, cmd->nsect,
2559 cmd->lbal, cmd->lbam, cmd->lbah,
2560 cmd->hob_feature, cmd->hob_nsect,
2561 cmd->hob_lbal, cmd->hob_lbam, cmd->hob_lbah,
Tejun Heoabb6a882007-11-28 23:16:09 +09002562 cmd->device, qc->tag, data_buf, cdb_buf,
Tejun Heo8a937582006-11-14 22:36:12 +09002563 res->command, res->feature, res->nsect,
2564 res->lbal, res->lbam, res->lbah,
2565 res->hob_feature, res->hob_nsect,
2566 res->hob_lbal, res->hob_lbam, res->hob_lbah,
Tejun Heo5335b722007-07-16 14:29:40 +09002567 res->device, qc->err_mask, ata_err_string(qc->err_mask),
2568 qc->err_mask & AC_ERR_NCQ ? " <F>" : "");
Robert Hancock1333e192007-10-02 11:22:02 -04002569
Robert Hancock65211482009-07-14 20:43:39 -06002570#ifdef CONFIG_ATA_VERBOSE_ERROR
Robert Hancock1333e192007-10-02 11:22:02 -04002571 if (res->command & (ATA_BUSY | ATA_DRDY | ATA_DF | ATA_DRQ |
Tejun Heo84ded2f2015-08-03 11:45:34 -04002572 ATA_ERR)) {
Robert Hancock1333e192007-10-02 11:22:02 -04002573 if (res->command & ATA_BUSY)
Joe Perchesa9a79df2011-04-15 15:51:59 -07002574 ata_dev_err(qc->dev, "status: { Busy }\n");
Robert Hancock1333e192007-10-02 11:22:02 -04002575 else
Tejun Heo84ded2f2015-08-03 11:45:34 -04002576 ata_dev_err(qc->dev, "status: { %s%s%s%s}\n",
Robert Hancock1333e192007-10-02 11:22:02 -04002577 res->command & ATA_DRDY ? "DRDY " : "",
2578 res->command & ATA_DF ? "DF " : "",
2579 res->command & ATA_DRQ ? "DRQ " : "",
Jeff Garzik2dcb4072007-10-19 06:42:56 -04002580 res->command & ATA_ERR ? "ERR " : "");
Robert Hancock1333e192007-10-02 11:22:02 -04002581 }
2582
2583 if (cmd->command != ATA_CMD_PACKET &&
Alexey Asemoveec7e1c2014-07-15 10:28:42 +04002584 (res->feature & (ATA_ICRC | ATA_UNC | ATA_AMNF |
2585 ATA_IDNF | ATA_ABORTED)))
2586 ata_dev_err(qc->dev, "error: { %s%s%s%s%s}\n",
Robert Hancock1333e192007-10-02 11:22:02 -04002587 res->feature & ATA_ICRC ? "ICRC " : "",
2588 res->feature & ATA_UNC ? "UNC " : "",
Alexey Asemoveec7e1c2014-07-15 10:28:42 +04002589 res->feature & ATA_AMNF ? "AMNF " : "",
Robert Hancock1333e192007-10-02 11:22:02 -04002590 res->feature & ATA_IDNF ? "IDNF " : "",
Jeff Garzik2dcb4072007-10-19 06:42:56 -04002591 res->feature & ATA_ABORTED ? "ABRT " : "");
Robert Hancock65211482009-07-14 20:43:39 -06002592#endif
Tejun Heo022bdb02006-05-15 20:58:22 +09002593 }
2594}
2595
Tejun Heo9b1e2652007-08-06 18:36:24 +09002596/**
2597 * ata_eh_report - report error handling to user
2598 * @ap: ATA port to report EH about
2599 *
2600 * Report EH to user.
2601 *
2602 * LOCKING:
2603 * None.
2604 */
Tejun Heofb7fd612007-09-23 13:14:12 +09002605void ata_eh_report(struct ata_port *ap)
Tejun Heo9b1e2652007-08-06 18:36:24 +09002606{
2607 struct ata_link *link;
2608
Tejun Heo1eca4362008-11-03 20:03:17 +09002609 ata_for_each_link(link, ap, HOST_FIRST)
Tejun Heo9b1e2652007-08-06 18:36:24 +09002610 ata_eh_link_report(link);
2611}
2612
Tejun Heocc0680a2007-08-06 18:36:23 +09002613static int ata_do_reset(struct ata_link *link, ata_reset_fn_t reset,
Tejun Heob1c72912008-07-31 17:02:43 +09002614 unsigned int *classes, unsigned long deadline,
2615 bool clear_classes)
Tejun Heod87fa382006-05-31 18:28:24 +09002616{
Tejun Heof58229f2007-08-06 18:36:23 +09002617 struct ata_device *dev;
Tejun Heod87fa382006-05-31 18:28:24 +09002618
Tejun Heob1c72912008-07-31 17:02:43 +09002619 if (clear_classes)
Tejun Heo1eca4362008-11-03 20:03:17 +09002620 ata_for_each_dev(dev, link, ALL)
Tejun Heob1c72912008-07-31 17:02:43 +09002621 classes[dev->devno] = ATA_DEV_UNKNOWN;
Tejun Heod87fa382006-05-31 18:28:24 +09002622
Tejun Heof0465192008-05-19 01:15:08 +09002623 return reset(link, classes, deadline);
Tejun Heod87fa382006-05-31 18:28:24 +09002624}
2625
Sergei Shtylyove8411fb2011-08-09 23:25:50 +04002626static int ata_eh_followup_srst_needed(struct ata_link *link, int rc)
Tejun Heo664faf02006-05-31 18:27:50 +09002627{
Tejun Heo45db2f62008-04-08 01:46:56 +09002628 if ((link->flags & ATA_LFLAG_NO_SRST) || ata_link_offline(link))
Tejun Heoae791c02007-09-23 13:14:12 +09002629 return 0;
Tejun Heo5dbfc9c2008-07-31 16:08:02 +09002630 if (rc == -EAGAIN)
2631 return 1;
Tejun Heo071f44b2008-04-07 22:47:22 +09002632 if (sata_pmp_supported(link->ap) && ata_is_host_link(link))
Tejun Heo3495de72007-09-23 13:19:53 +09002633 return 1;
Tejun Heo664faf02006-05-31 18:27:50 +09002634 return 0;
2635}
2636
Tejun Heofb7fd612007-09-23 13:14:12 +09002637int ata_eh_reset(struct ata_link *link, int classify,
2638 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
2639 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
Tejun Heo022bdb02006-05-15 20:58:22 +09002640{
Tejun Heoafaa5c32007-10-09 15:06:10 +09002641 struct ata_port *ap = link->ap;
Tejun Heob1c72912008-07-31 17:02:43 +09002642 struct ata_link *slave = ap->slave_link;
Tejun Heo936fd732007-08-06 18:36:23 +09002643 struct ata_eh_context *ehc = &link->eh_context;
Bartlomiej Zolnierkiewicz705d2012009-07-26 16:21:01 +02002644 struct ata_eh_context *sehc = slave ? &slave->eh_context : NULL;
Tejun Heo664faf02006-05-31 18:27:50 +09002645 unsigned int *classes = ehc->classes;
Tejun Heo416dc9e2007-10-31 10:17:03 +09002646 unsigned int lflags = link->flags;
Tejun Heo1cdaf532006-07-03 16:07:26 +09002647 int verbose = !(ehc->i.flags & ATA_EHI_QUIET);
Tejun Heod8af0eb2008-05-20 02:17:53 +09002648 int max_tries = 0, try = 0;
Tejun Heob1c72912008-07-31 17:02:43 +09002649 struct ata_link *failed_link;
Tejun Heof58229f2007-08-06 18:36:23 +09002650 struct ata_device *dev;
Tejun Heo416dc9e2007-10-31 10:17:03 +09002651 unsigned long deadline, now;
Tejun Heo022bdb02006-05-15 20:58:22 +09002652 ata_reset_fn_t reset;
Tejun Heoafaa5c32007-10-09 15:06:10 +09002653 unsigned long flags;
Tejun Heo416dc9e2007-10-31 10:17:03 +09002654 u32 sstatus;
Tejun Heob1c72912008-07-31 17:02:43 +09002655 int nr_unknown, rc;
Tejun Heo022bdb02006-05-15 20:58:22 +09002656
Tejun Heo932648b2008-05-19 01:15:06 +09002657 /*
2658 * Prepare to reset
2659 */
Tejun Heod8af0eb2008-05-20 02:17:53 +09002660 while (ata_eh_reset_timeouts[max_tries] != ULONG_MAX)
2661 max_tries++;
Dan Williamsca6d43b2012-06-21 23:41:41 -07002662 if (link->flags & ATA_LFLAG_RST_ONCE)
2663 max_tries = 1;
Tejun Heo05944bd2008-08-13 20:19:09 +09002664 if (link->flags & ATA_LFLAG_NO_HRST)
2665 hardreset = NULL;
2666 if (link->flags & ATA_LFLAG_NO_SRST)
2667 softreset = NULL;
Tejun Heod8af0eb2008-05-20 02:17:53 +09002668
Lucas De Marchi25985ed2011-03-30 22:57:33 -03002669 /* make sure each reset attempt is at least COOL_DOWN apart */
Tejun Heo19b72322008-11-04 17:08:40 +09002670 if (ehc->i.flags & ATA_EHI_DID_RESET) {
2671 now = jiffies;
2672 WARN_ON(time_after(ehc->last_reset, now));
2673 deadline = ata_deadline(ehc->last_reset,
2674 ATA_EH_RESET_COOL_DOWN);
2675 if (time_before(now, deadline))
2676 schedule_timeout_uninterruptible(deadline - now);
2677 }
Tejun Heo0a2c0f52008-05-20 02:17:52 +09002678
Tejun Heoafaa5c32007-10-09 15:06:10 +09002679 spin_lock_irqsave(ap->lock, flags);
2680 ap->pflags |= ATA_PFLAG_RESETTING;
2681 spin_unlock_irqrestore(ap->lock, flags);
2682
Tejun Heocf480622008-01-24 00:05:14 +09002683 ata_eh_about_to_do(link, NULL, ATA_EH_RESET);
Tejun Heo13abf502006-07-10 23:18:46 +09002684
Tejun Heo1eca4362008-11-03 20:03:17 +09002685 ata_for_each_dev(dev, link, ALL) {
Tejun Heocdeab112007-10-29 16:41:09 +09002686 /* If we issue an SRST then an ATA drive (not ATAPI)
2687 * may change configuration and be in PIO0 timing. If
2688 * we do a hard reset (or are coming from power on)
2689 * this is true for ATA or ATAPI. Until we've set a
2690 * suitable controller mode we should not touch the
2691 * bus as we may be talking too fast.
2692 */
2693 dev->pio_mode = XFER_PIO_0;
Aaron Lu54169122012-12-03 11:35:02 +08002694 dev->dma_mode = 0xff;
Tejun Heocdeab112007-10-29 16:41:09 +09002695
2696 /* If the controller has a pio mode setup function
2697 * then use it to set the chipset to rights. Don't
2698 * touch the DMA setup as that will be dealt with when
2699 * configuring devices.
2700 */
2701 if (ap->ops->set_piomode)
2702 ap->ops->set_piomode(ap, dev);
2703 }
2704
Tejun Heocf480622008-01-24 00:05:14 +09002705 /* prefer hardreset */
Tejun Heo932648b2008-05-19 01:15:06 +09002706 reset = NULL;
Tejun Heocf480622008-01-24 00:05:14 +09002707 ehc->i.action &= ~ATA_EH_RESET;
2708 if (hardreset) {
2709 reset = hardreset;
Tejun Heoa6740502008-07-31 16:07:04 +09002710 ehc->i.action |= ATA_EH_HARDRESET;
Tejun Heo4f7faa32008-01-30 18:18:26 +09002711 } else if (softreset) {
Tejun Heocf480622008-01-24 00:05:14 +09002712 reset = softreset;
Tejun Heoa6740502008-07-31 16:07:04 +09002713 ehc->i.action |= ATA_EH_SOFTRESET;
Tejun Heocf480622008-01-24 00:05:14 +09002714 }
Tejun Heof5914a42006-05-31 18:27:48 +09002715
2716 if (prereset) {
Tejun Heob1c72912008-07-31 17:02:43 +09002717 unsigned long deadline = ata_deadline(jiffies,
2718 ATA_EH_PRERESET_TIMEOUT);
2719
2720 if (slave) {
2721 sehc->i.action &= ~ATA_EH_RESET;
2722 sehc->i.action |= ehc->i.action;
2723 }
2724
2725 rc = prereset(link, deadline);
2726
2727 /* If present, do prereset on slave link too. Reset
2728 * is skipped iff both master and slave links report
2729 * -ENOENT or clear ATA_EH_RESET.
2730 */
2731 if (slave && (rc == 0 || rc == -ENOENT)) {
2732 int tmp;
2733
2734 tmp = prereset(slave, deadline);
2735 if (tmp != -ENOENT)
2736 rc = tmp;
2737
2738 ehc->i.action |= sehc->i.action;
2739 }
2740
Tejun Heof5914a42006-05-31 18:27:48 +09002741 if (rc) {
Alan Coxc9619222006-09-26 17:53:38 +01002742 if (rc == -ENOENT) {
Joe Perchesa9a79df2011-04-15 15:51:59 -07002743 ata_link_dbg(link, "port disabled--ignoring\n");
Tejun Heocf480622008-01-24 00:05:14 +09002744 ehc->i.action &= ~ATA_EH_RESET;
Tejun Heo4aa9ab62007-03-12 17:24:08 +09002745
Tejun Heo1eca4362008-11-03 20:03:17 +09002746 ata_for_each_dev(dev, link, ALL)
Tejun Heof58229f2007-08-06 18:36:23 +09002747 classes[dev->devno] = ATA_DEV_NONE;
Tejun Heo4aa9ab62007-03-12 17:24:08 +09002748
2749 rc = 0;
Alan Coxc9619222006-09-26 17:53:38 +01002750 } else
Joe Perchesa9a79df2011-04-15 15:51:59 -07002751 ata_link_err(link,
2752 "prereset failed (errno=%d)\n",
2753 rc);
Tejun Heofccb6ea2007-07-16 14:29:41 +09002754 goto out;
Tejun Heof5914a42006-05-31 18:27:48 +09002755 }
Tejun Heof5914a42006-05-31 18:27:48 +09002756
Tejun Heo932648b2008-05-19 01:15:06 +09002757 /* prereset() might have cleared ATA_EH_RESET. If so,
Tejun Heod6515e62009-03-04 15:59:30 +09002758 * bang classes, thaw and return.
Tejun Heo932648b2008-05-19 01:15:06 +09002759 */
2760 if (reset && !(ehc->i.action & ATA_EH_RESET)) {
Tejun Heo1eca4362008-11-03 20:03:17 +09002761 ata_for_each_dev(dev, link, ALL)
Tejun Heo932648b2008-05-19 01:15:06 +09002762 classes[dev->devno] = ATA_DEV_NONE;
Tejun Heod6515e62009-03-04 15:59:30 +09002763 if ((ap->pflags & ATA_PFLAG_FROZEN) &&
2764 ata_is_host_link(link))
2765 ata_eh_thaw_port(ap);
Tejun Heo932648b2008-05-19 01:15:06 +09002766 rc = 0;
2767 goto out;
2768 }
Tejun Heof5914a42006-05-31 18:27:48 +09002769 }
2770
Tejun Heo022bdb02006-05-15 20:58:22 +09002771 retry:
Tejun Heo932648b2008-05-19 01:15:06 +09002772 /*
2773 * Perform reset
2774 */
Tejun Heodc98c322008-05-19 01:15:07 +09002775 if (ata_is_host_link(link))
2776 ata_eh_freeze_port(ap);
2777
Tejun Heo341c2c92008-05-20 02:17:51 +09002778 deadline = ata_deadline(jiffies, ata_eh_reset_timeouts[try++]);
Tejun Heo31daabd2007-02-02 16:50:52 +09002779
Tejun Heo932648b2008-05-19 01:15:06 +09002780 if (reset) {
2781 if (verbose)
Joe Perchesa9a79df2011-04-15 15:51:59 -07002782 ata_link_info(link, "%s resetting link\n",
2783 reset == softreset ? "soft" : "hard");
Tejun Heo022bdb02006-05-15 20:58:22 +09002784
Tejun Heo932648b2008-05-19 01:15:06 +09002785 /* mark that this EH session started with reset */
Tejun Heo19b72322008-11-04 17:08:40 +09002786 ehc->last_reset = jiffies;
Tejun Heo932648b2008-05-19 01:15:06 +09002787 if (reset == hardreset)
2788 ehc->i.flags |= ATA_EHI_DID_HARDRESET;
2789 else
2790 ehc->i.flags |= ATA_EHI_DID_SOFTRESET;
Tejun Heo022bdb02006-05-15 20:58:22 +09002791
Tejun Heob1c72912008-07-31 17:02:43 +09002792 rc = ata_do_reset(link, reset, classes, deadline, true);
2793 if (rc && rc != -EAGAIN) {
2794 failed_link = link;
Tejun Heo5dbfc9c2008-07-31 16:08:02 +09002795 goto fail;
Tejun Heob1c72912008-07-31 17:02:43 +09002796 }
Tejun Heo022bdb02006-05-15 20:58:22 +09002797
Tejun Heob1c72912008-07-31 17:02:43 +09002798 /* hardreset slave link if existent */
2799 if (slave && reset == hardreset) {
2800 int tmp;
2801
2802 if (verbose)
Joe Perchesa9a79df2011-04-15 15:51:59 -07002803 ata_link_info(slave, "hard resetting link\n");
Tejun Heob1c72912008-07-31 17:02:43 +09002804
2805 ata_eh_about_to_do(slave, NULL, ATA_EH_RESET);
2806 tmp = ata_do_reset(slave, reset, classes, deadline,
2807 false);
2808 switch (tmp) {
2809 case -EAGAIN:
2810 rc = -EAGAIN;
2811 case 0:
2812 break;
2813 default:
2814 failed_link = slave;
2815 rc = tmp;
2816 goto fail;
2817 }
2818 }
2819
2820 /* perform follow-up SRST if necessary */
Tejun Heo932648b2008-05-19 01:15:06 +09002821 if (reset == hardreset &&
Sergei Shtylyove8411fb2011-08-09 23:25:50 +04002822 ata_eh_followup_srst_needed(link, rc)) {
Tejun Heo932648b2008-05-19 01:15:06 +09002823 reset = softreset;
Tejun Heo664faf02006-05-31 18:27:50 +09002824
Tejun Heo932648b2008-05-19 01:15:06 +09002825 if (!reset) {
Joe Perchesa9a79df2011-04-15 15:51:59 -07002826 ata_link_err(link,
2827 "follow-up softreset required but no softreset available\n");
Tejun Heob1c72912008-07-31 17:02:43 +09002828 failed_link = link;
Tejun Heo932648b2008-05-19 01:15:06 +09002829 rc = -EINVAL;
2830 goto fail;
2831 }
2832
2833 ata_eh_about_to_do(link, NULL, ATA_EH_RESET);
Tejun Heob1c72912008-07-31 17:02:43 +09002834 rc = ata_do_reset(link, reset, classes, deadline, true);
Tejun Heofe2c4d02009-07-08 12:16:37 +09002835 if (rc) {
2836 failed_link = link;
2837 goto fail;
2838 }
Tejun Heo664faf02006-05-31 18:27:50 +09002839 }
Tejun Heo932648b2008-05-19 01:15:06 +09002840 } else {
2841 if (verbose)
Joe Perchesa9a79df2011-04-15 15:51:59 -07002842 ata_link_info(link,
2843 "no reset method available, skipping reset\n");
Tejun Heo932648b2008-05-19 01:15:06 +09002844 if (!(lflags & ATA_LFLAG_ASSUME_CLASS))
2845 lflags |= ATA_LFLAG_ASSUME_ATA;
Tejun Heo664faf02006-05-31 18:27:50 +09002846 }
2847
Tejun Heo932648b2008-05-19 01:15:06 +09002848 /*
2849 * Post-reset processing
2850 */
Tejun Heo1eca4362008-11-03 20:03:17 +09002851 ata_for_each_dev(dev, link, ALL) {
Tejun Heo416dc9e2007-10-31 10:17:03 +09002852 /* After the reset, the device state is PIO 0 and the
2853 * controller state is undefined. Reset also wakes up
2854 * drives from sleeping mode.
2855 */
2856 dev->pio_mode = XFER_PIO_0;
2857 dev->flags &= ~ATA_DFLAG_SLEEPING;
Tejun Heo664faf02006-05-31 18:27:50 +09002858
Tejun Heo3b761d32009-10-06 17:08:40 +09002859 if (ata_phys_link_offline(ata_dev_phys_link(dev)))
2860 continue;
2861
2862 /* apply class override */
2863 if (lflags & ATA_LFLAG_ASSUME_ATA)
2864 classes[dev->devno] = ATA_DEV_ATA;
2865 else if (lflags & ATA_LFLAG_ASSUME_SEMB)
2866 classes[dev->devno] = ATA_DEV_SEMB_UNSUP;
Tejun Heo022bdb02006-05-15 20:58:22 +09002867 }
2868
Tejun Heo416dc9e2007-10-31 10:17:03 +09002869 /* record current link speed */
2870 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0)
2871 link->sata_spd = (sstatus >> 4) & 0xf;
Tejun Heob1c72912008-07-31 17:02:43 +09002872 if (slave && sata_scr_read(slave, SCR_STATUS, &sstatus) == 0)
2873 slave->sata_spd = (sstatus >> 4) & 0xf;
Tejun Heo008a7892007-07-16 14:29:40 +09002874
Tejun Heodc98c322008-05-19 01:15:07 +09002875 /* thaw the port */
2876 if (ata_is_host_link(link))
2877 ata_eh_thaw_port(ap);
2878
Tejun Heof0465192008-05-19 01:15:08 +09002879 /* postreset() should clear hardware SError. Although SError
2880 * is cleared during link resume, clearing SError here is
2881 * necessary as some PHYs raise hotplug events after SRST.
2882 * This introduces race condition where hotplug occurs between
2883 * reset and here. This race is mediated by cross checking
2884 * link onlineness and classification result later.
2885 */
Tejun Heob1c72912008-07-31 17:02:43 +09002886 if (postreset) {
Tejun Heo416dc9e2007-10-31 10:17:03 +09002887 postreset(link, classes);
Tejun Heob1c72912008-07-31 17:02:43 +09002888 if (slave)
2889 postreset(slave, classes);
2890 }
Tejun Heo20952b62006-05-31 18:27:23 +09002891
Tejun Heo1e641062009-07-17 11:58:33 +09002892 /*
Tejun Heo8c56cac2011-05-25 13:19:39 +02002893 * Some controllers can't be frozen very well and may set spurious
2894 * error conditions during reset. Clear accumulated error
2895 * information and re-thaw the port if frozen. As reset is the
2896 * final recovery action and we cross check link onlineness against
2897 * device classification later, no hotplug event is lost by this.
Tejun Heo1e641062009-07-17 11:58:33 +09002898 */
Tejun Heof0465192008-05-19 01:15:08 +09002899 spin_lock_irqsave(link->ap->lock, flags);
Tejun Heo1e641062009-07-17 11:58:33 +09002900 memset(&link->eh_info, 0, sizeof(link->eh_info));
Tejun Heob1c72912008-07-31 17:02:43 +09002901 if (slave)
Tejun Heo1e641062009-07-17 11:58:33 +09002902 memset(&slave->eh_info, 0, sizeof(link->eh_info));
2903 ap->pflags &= ~ATA_PFLAG_EH_PENDING;
Tejun Heof0465192008-05-19 01:15:08 +09002904 spin_unlock_irqrestore(link->ap->lock, flags);
2905
Tejun Heo8c56cac2011-05-25 13:19:39 +02002906 if (ap->pflags & ATA_PFLAG_FROZEN)
2907 ata_eh_thaw_port(ap);
2908
Tejun Heo3b761d32009-10-06 17:08:40 +09002909 /*
2910 * Make sure onlineness and classification result correspond.
Tejun Heof0465192008-05-19 01:15:08 +09002911 * Hotplug could have happened during reset and some
2912 * controllers fail to wait while a drive is spinning up after
2913 * being hotplugged causing misdetection. By cross checking
Tejun Heo3b761d32009-10-06 17:08:40 +09002914 * link on/offlineness and classification result, those
2915 * conditions can be reliably detected and retried.
Tejun Heof0465192008-05-19 01:15:08 +09002916 */
Tejun Heob1c72912008-07-31 17:02:43 +09002917 nr_unknown = 0;
Tejun Heo1eca4362008-11-03 20:03:17 +09002918 ata_for_each_dev(dev, link, ALL) {
Tejun Heo3b761d32009-10-06 17:08:40 +09002919 if (ata_phys_link_online(ata_dev_phys_link(dev))) {
2920 if (classes[dev->devno] == ATA_DEV_UNKNOWN) {
Joe Perchesa9a79df2011-04-15 15:51:59 -07002921 ata_dev_dbg(dev, "link online but device misclassified\n");
Tejun Heo3b761d32009-10-06 17:08:40 +09002922 classes[dev->devno] = ATA_DEV_NONE;
Tejun Heob1c72912008-07-31 17:02:43 +09002923 nr_unknown++;
Tejun Heo3b761d32009-10-06 17:08:40 +09002924 }
2925 } else if (ata_phys_link_offline(ata_dev_phys_link(dev))) {
2926 if (ata_class_enabled(classes[dev->devno]))
Joe Perchesa9a79df2011-04-15 15:51:59 -07002927 ata_dev_dbg(dev,
2928 "link offline, clearing class %d to NONE\n",
2929 classes[dev->devno]);
Tejun Heo3b761d32009-10-06 17:08:40 +09002930 classes[dev->devno] = ATA_DEV_NONE;
2931 } else if (classes[dev->devno] == ATA_DEV_UNKNOWN) {
Joe Perchesa9a79df2011-04-15 15:51:59 -07002932 ata_dev_dbg(dev,
2933 "link status unknown, clearing UNKNOWN to NONE\n");
Tejun Heo3b761d32009-10-06 17:08:40 +09002934 classes[dev->devno] = ATA_DEV_NONE;
Tejun Heob1c72912008-07-31 17:02:43 +09002935 }
Tejun Heof0465192008-05-19 01:15:08 +09002936 }
2937
Tejun Heob1c72912008-07-31 17:02:43 +09002938 if (classify && nr_unknown) {
Tejun Heof0465192008-05-19 01:15:08 +09002939 if (try < max_tries) {
Joe Perchesa9a79df2011-04-15 15:51:59 -07002940 ata_link_warn(link,
2941 "link online but %d devices misclassified, retrying\n",
2942 nr_unknown);
Tejun Heob1c72912008-07-31 17:02:43 +09002943 failed_link = link;
Tejun Heof0465192008-05-19 01:15:08 +09002944 rc = -EAGAIN;
2945 goto fail;
2946 }
Joe Perchesa9a79df2011-04-15 15:51:59 -07002947 ata_link_warn(link,
2948 "link online but %d devices misclassified, "
2949 "device detection might fail\n", nr_unknown);
Tejun Heof0465192008-05-19 01:15:08 +09002950 }
2951
Tejun Heo416dc9e2007-10-31 10:17:03 +09002952 /* reset successful, schedule revalidation */
Tejun Heocf480622008-01-24 00:05:14 +09002953 ata_eh_done(link, NULL, ATA_EH_RESET);
Tejun Heob1c72912008-07-31 17:02:43 +09002954 if (slave)
2955 ata_eh_done(slave, NULL, ATA_EH_RESET);
Tejun Heo6b7ae952010-09-01 17:50:06 +02002956 ehc->last_reset = jiffies; /* update to completion time */
Tejun Heo416dc9e2007-10-31 10:17:03 +09002957 ehc->i.action |= ATA_EH_REVALIDATE;
Tejun Heo6b7ae952010-09-01 17:50:06 +02002958 link->lpm_policy = ATA_LPM_UNKNOWN; /* reset LPM state */
Tejun Heoae791c02007-09-23 13:14:12 +09002959
Tejun Heo416dc9e2007-10-31 10:17:03 +09002960 rc = 0;
Tejun Heofccb6ea2007-07-16 14:29:41 +09002961 out:
2962 /* clear hotplug flag */
2963 ehc->i.flags &= ~ATA_EHI_HOTPLUGGED;
Tejun Heob1c72912008-07-31 17:02:43 +09002964 if (slave)
2965 sehc->i.flags &= ~ATA_EHI_HOTPLUGGED;
Tejun Heoafaa5c32007-10-09 15:06:10 +09002966
2967 spin_lock_irqsave(ap->lock, flags);
2968 ap->pflags &= ~ATA_PFLAG_RESETTING;
2969 spin_unlock_irqrestore(ap->lock, flags);
2970
Tejun Heo022bdb02006-05-15 20:58:22 +09002971 return rc;
Tejun Heo416dc9e2007-10-31 10:17:03 +09002972
2973 fail:
Tejun Heo5958e302008-04-07 22:47:20 +09002974 /* if SCR isn't accessible on a fan-out port, PMP needs to be reset */
2975 if (!ata_is_host_link(link) &&
2976 sata_scr_read(link, SCR_STATUS, &sstatus))
2977 rc = -ERESTART;
2978
Gwendal Grignou7a46c072011-10-19 17:17:02 -07002979 if (try >= max_tries) {
Tejun Heo8ea76452011-05-25 12:23:56 +02002980 /*
2981 * Thaw host port even if reset failed, so that the port
2982 * can be retried on the next phy event. This risks
2983 * repeated EH runs but seems to be a better tradeoff than
2984 * shutting down a port after a botched hotplug attempt.
2985 */
2986 if (ata_is_host_link(link))
2987 ata_eh_thaw_port(ap);
Tejun Heo416dc9e2007-10-31 10:17:03 +09002988 goto out;
Tejun Heo8ea76452011-05-25 12:23:56 +02002989 }
Tejun Heo416dc9e2007-10-31 10:17:03 +09002990
2991 now = jiffies;
2992 if (time_before(now, deadline)) {
2993 unsigned long delta = deadline - now;
2994
Joe Perchesa9a79df2011-04-15 15:51:59 -07002995 ata_link_warn(failed_link,
Tejun Heo0a2c0f52008-05-20 02:17:52 +09002996 "reset failed (errno=%d), retrying in %u secs\n",
2997 rc, DIV_ROUND_UP(jiffies_to_msecs(delta), 1000));
Tejun Heo416dc9e2007-10-31 10:17:03 +09002998
Tejun Heoc0c362b2010-09-06 17:57:14 +02002999 ata_eh_release(ap);
Tejun Heo416dc9e2007-10-31 10:17:03 +09003000 while (delta)
3001 delta = schedule_timeout_uninterruptible(delta);
Tejun Heoc0c362b2010-09-06 17:57:14 +02003002 ata_eh_acquire(ap);
Tejun Heo416dc9e2007-10-31 10:17:03 +09003003 }
3004
Gwendal Grignou7a46c072011-10-19 17:17:02 -07003005 /*
3006 * While disks spinup behind PMP, some controllers fail sending SRST.
3007 * They need to be reset - as well as the PMP - before retrying.
3008 */
3009 if (rc == -ERESTART) {
3010 if (ata_is_host_link(link))
3011 ata_eh_thaw_port(ap);
3012 goto out;
3013 }
3014
Tejun Heob1c72912008-07-31 17:02:43 +09003015 if (try == max_tries - 1) {
Tejun Heoa07d4992009-01-29 20:31:33 +09003016 sata_down_spd_limit(link, 0);
Tejun Heob1c72912008-07-31 17:02:43 +09003017 if (slave)
Tejun Heoa07d4992009-01-29 20:31:33 +09003018 sata_down_spd_limit(slave, 0);
Tejun Heob1c72912008-07-31 17:02:43 +09003019 } else if (rc == -EPIPE)
Tejun Heoa07d4992009-01-29 20:31:33 +09003020 sata_down_spd_limit(failed_link, 0);
Tejun Heob1c72912008-07-31 17:02:43 +09003021
Tejun Heo416dc9e2007-10-31 10:17:03 +09003022 if (hardreset)
3023 reset = hardreset;
3024 goto retry;
Tejun Heo022bdb02006-05-15 20:58:22 +09003025}
3026
Elias Oltmanns45fabbb2008-09-21 11:54:08 +02003027static inline void ata_eh_pull_park_action(struct ata_port *ap)
3028{
3029 struct ata_link *link;
3030 struct ata_device *dev;
3031 unsigned long flags;
3032
3033 /*
3034 * This function can be thought of as an extended version of
3035 * ata_eh_about_to_do() specially crafted to accommodate the
3036 * requirements of ATA_EH_PARK handling. Since the EH thread
3037 * does not leave the do {} while () loop in ata_eh_recover as
3038 * long as the timeout for a park request to *one* device on
3039 * the port has not expired, and since we still want to pick
3040 * up park requests to other devices on the same port or
3041 * timeout updates for the same device, we have to pull
3042 * ATA_EH_PARK actions from eh_info into eh_context.i
3043 * ourselves at the beginning of each pass over the loop.
3044 *
3045 * Additionally, all write accesses to &ap->park_req_pending
Wolfram Sang16735d02013-11-14 14:32:02 -08003046 * through reinit_completion() (see below) or complete_all()
Elias Oltmanns45fabbb2008-09-21 11:54:08 +02003047 * (see ata_scsi_park_store()) are protected by the host lock.
3048 * As a result we have that park_req_pending.done is zero on
3049 * exit from this function, i.e. when ATA_EH_PARK actions for
3050 * *all* devices on port ap have been pulled into the
3051 * respective eh_context structs. If, and only if,
3052 * park_req_pending.done is non-zero by the time we reach
3053 * wait_for_completion_timeout(), another ATA_EH_PARK action
3054 * has been scheduled for at least one of the devices on port
3055 * ap and we have to cycle over the do {} while () loop in
3056 * ata_eh_recover() again.
3057 */
3058
3059 spin_lock_irqsave(ap->lock, flags);
Wolfram Sang16735d02013-11-14 14:32:02 -08003060 reinit_completion(&ap->park_req_pending);
Tejun Heo1eca4362008-11-03 20:03:17 +09003061 ata_for_each_link(link, ap, EDGE) {
3062 ata_for_each_dev(dev, link, ALL) {
Elias Oltmanns45fabbb2008-09-21 11:54:08 +02003063 struct ata_eh_info *ehi = &link->eh_info;
3064
3065 link->eh_context.i.dev_action[dev->devno] |=
3066 ehi->dev_action[dev->devno] & ATA_EH_PARK;
3067 ata_eh_clear_action(link, dev, ehi, ATA_EH_PARK);
3068 }
3069 }
3070 spin_unlock_irqrestore(ap->lock, flags);
3071}
3072
3073static void ata_eh_park_issue_cmd(struct ata_device *dev, int park)
3074{
3075 struct ata_eh_context *ehc = &dev->link->eh_context;
3076 struct ata_taskfile tf;
3077 unsigned int err_mask;
3078
3079 ata_tf_init(dev, &tf);
3080 if (park) {
3081 ehc->unloaded_mask |= 1 << dev->devno;
3082 tf.command = ATA_CMD_IDLEIMMEDIATE;
3083 tf.feature = 0x44;
3084 tf.lbal = 0x4c;
3085 tf.lbam = 0x4e;
3086 tf.lbah = 0x55;
3087 } else {
3088 ehc->unloaded_mask &= ~(1 << dev->devno);
3089 tf.command = ATA_CMD_CHK_POWER;
3090 }
3091
3092 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
3093 tf.protocol |= ATA_PROT_NODATA;
3094 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
3095 if (park && (err_mask || tf.lbal != 0xc4)) {
Joe Perchesa9a79df2011-04-15 15:51:59 -07003096 ata_dev_err(dev, "head unload failed!\n");
Elias Oltmanns45fabbb2008-09-21 11:54:08 +02003097 ehc->unloaded_mask &= ~(1 << dev->devno);
3098 }
3099}
3100
Tejun Heo02607312007-08-06 18:36:23 +09003101static int ata_eh_revalidate_and_attach(struct ata_link *link,
Tejun Heo084fe632006-05-31 18:28:03 +09003102 struct ata_device **r_failed_dev)
Tejun Heo022bdb02006-05-15 20:58:22 +09003103{
Tejun Heo02607312007-08-06 18:36:23 +09003104 struct ata_port *ap = link->ap;
3105 struct ata_eh_context *ehc = &link->eh_context;
Tejun Heo022bdb02006-05-15 20:58:22 +09003106 struct ata_device *dev;
Tejun Heo8c3c52a2007-03-22 22:24:19 +09003107 unsigned int new_mask = 0;
Tejun Heo084fe632006-05-31 18:28:03 +09003108 unsigned long flags;
Tejun Heof58229f2007-08-06 18:36:23 +09003109 int rc = 0;
Tejun Heo022bdb02006-05-15 20:58:22 +09003110
3111 DPRINTK("ENTER\n");
3112
Tejun Heo8c3c52a2007-03-22 22:24:19 +09003113 /* For PATA drive side cable detection to work, IDENTIFY must
3114 * be done backwards such that PDIAG- is released by the slave
3115 * device before the master device is identified.
3116 */
Tejun Heo1eca4362008-11-03 20:03:17 +09003117 ata_for_each_dev(dev, link, ALL_REVERSE) {
Tejun Heof58229f2007-08-06 18:36:23 +09003118 unsigned int action = ata_eh_dev_action(dev);
3119 unsigned int readid_flags = 0;
Tejun Heo47005f22006-06-19 18:27:23 +09003120
Tejun Heobff04642006-11-10 18:08:10 +09003121 if (ehc->i.flags & ATA_EHI_DID_RESET)
3122 readid_flags |= ATA_READID_POSTRESET;
3123
Tejun Heo9666f402007-05-04 21:27:47 +02003124 if ((action & ATA_EH_REVALIDATE) && ata_dev_enabled(dev)) {
Tejun Heo633273a32007-09-23 13:19:54 +09003125 WARN_ON(dev->class == ATA_DEV_PMP);
3126
Tejun Heob1c72912008-07-31 17:02:43 +09003127 if (ata_phys_link_offline(ata_dev_phys_link(dev))) {
Tejun Heo022bdb02006-05-15 20:58:22 +09003128 rc = -EIO;
Tejun Heo8c3c52a2007-03-22 22:24:19 +09003129 goto err;
Tejun Heo022bdb02006-05-15 20:58:22 +09003130 }
3131
Tejun Heo02607312007-08-06 18:36:23 +09003132 ata_eh_about_to_do(link, dev, ATA_EH_REVALIDATE);
Tejun Heo422c9da2007-09-23 13:14:12 +09003133 rc = ata_dev_revalidate(dev, ehc->classes[dev->devno],
3134 readid_flags);
Tejun Heo022bdb02006-05-15 20:58:22 +09003135 if (rc)
Tejun Heo8c3c52a2007-03-22 22:24:19 +09003136 goto err;
Tejun Heo022bdb02006-05-15 20:58:22 +09003137
Tejun Heo02607312007-08-06 18:36:23 +09003138 ata_eh_done(link, dev, ATA_EH_REVALIDATE);
Tejun Heo47005f22006-06-19 18:27:23 +09003139
Tejun Heobaa1e782006-11-01 18:39:27 +09003140 /* Configuration may have changed, reconfigure
3141 * transfer mode.
3142 */
3143 ehc->i.flags |= ATA_EHI_SETMODE;
3144
zhao, forrest3057ac32006-06-12 12:01:34 +08003145 /* schedule the scsi_rescan_device() here */
Tejun Heoad72cf92010-07-02 10:03:52 +02003146 schedule_work(&(ap->scsi_rescan_task));
Tejun Heo084fe632006-05-31 18:28:03 +09003147 } else if (dev->class == ATA_DEV_UNKNOWN &&
3148 ehc->tries[dev->devno] &&
3149 ata_class_enabled(ehc->classes[dev->devno])) {
Tejun Heo842faa62009-05-10 01:06:54 +09003150 /* Temporarily set dev->class, it will be
3151 * permanently set once all configurations are
3152 * complete. This is necessary because new
3153 * device configuration is done in two
3154 * separate loops.
3155 */
Tejun Heo084fe632006-05-31 18:28:03 +09003156 dev->class = ehc->classes[dev->devno];
3157
Tejun Heo633273a32007-09-23 13:19:54 +09003158 if (dev->class == ATA_DEV_PMP)
3159 rc = sata_pmp_attach(dev);
3160 else
3161 rc = ata_dev_read_id(dev, &dev->class,
3162 readid_flags, dev->id);
Tejun Heo842faa62009-05-10 01:06:54 +09003163
3164 /* read_id might have changed class, store and reset */
3165 ehc->classes[dev->devno] = dev->class;
3166 dev->class = ATA_DEV_UNKNOWN;
3167
Tejun Heo8c3c52a2007-03-22 22:24:19 +09003168 switch (rc) {
3169 case 0:
Tejun Heo99cf6102009-01-29 20:31:32 +09003170 /* clear error info accumulated during probe */
3171 ata_ering_clear(&dev->ering);
Tejun Heof58229f2007-08-06 18:36:23 +09003172 new_mask |= 1 << dev->devno;
Tejun Heo8c3c52a2007-03-22 22:24:19 +09003173 break;
3174 case -ENOENT:
Tejun Heo55a8e2c2006-11-10 18:08:10 +09003175 /* IDENTIFY was issued to non-existent
3176 * device. No need to reset. Just
Tejun Heo842faa62009-05-10 01:06:54 +09003177 * thaw and ignore the device.
Tejun Heo55a8e2c2006-11-10 18:08:10 +09003178 */
3179 ata_eh_thaw_port(ap);
Tejun Heo084fe632006-05-31 18:28:03 +09003180 break;
Tejun Heo8c3c52a2007-03-22 22:24:19 +09003181 default:
Tejun Heo8c3c52a2007-03-22 22:24:19 +09003182 goto err;
Tejun Heo55a8e2c2006-11-10 18:08:10 +09003183 }
Tejun Heo022bdb02006-05-15 20:58:22 +09003184 }
3185 }
3186
Tejun Heoc1c4e8d2007-04-23 02:05:53 +09003187 /* PDIAG- should have been released, ask cable type if post-reset */
Tejun Heo33267322008-02-13 09:15:09 +09003188 if ((ehc->i.flags & ATA_EHI_DID_RESET) && ata_is_host_link(link)) {
3189 if (ap->ops->cable_detect)
3190 ap->cbl = ap->ops->cable_detect(ap);
3191 ata_force_cbl(ap);
3192 }
Tejun Heoc1c4e8d2007-04-23 02:05:53 +09003193
Tejun Heo8c3c52a2007-03-22 22:24:19 +09003194 /* Configure new devices forward such that user doesn't see
3195 * device detection messages backwards.
3196 */
Tejun Heo1eca4362008-11-03 20:03:17 +09003197 ata_for_each_dev(dev, link, ALL) {
Tejun Heo4f7c2872009-10-15 23:37:32 +09003198 if (!(new_mask & (1 << dev->devno)))
Tejun Heo8c3c52a2007-03-22 22:24:19 +09003199 continue;
3200
Tejun Heo842faa62009-05-10 01:06:54 +09003201 dev->class = ehc->classes[dev->devno];
3202
Tejun Heo4f7c2872009-10-15 23:37:32 +09003203 if (dev->class == ATA_DEV_PMP)
3204 continue;
3205
Tejun Heo8c3c52a2007-03-22 22:24:19 +09003206 ehc->i.flags |= ATA_EHI_PRINTINFO;
3207 rc = ata_dev_configure(dev);
3208 ehc->i.flags &= ~ATA_EHI_PRINTINFO;
Tejun Heo842faa62009-05-10 01:06:54 +09003209 if (rc) {
3210 dev->class = ATA_DEV_UNKNOWN;
Tejun Heo8c3c52a2007-03-22 22:24:19 +09003211 goto err;
Tejun Heo842faa62009-05-10 01:06:54 +09003212 }
Tejun Heo8c3c52a2007-03-22 22:24:19 +09003213
3214 spin_lock_irqsave(ap->lock, flags);
3215 ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG;
3216 spin_unlock_irqrestore(ap->lock, flags);
3217
3218 /* new device discovered, configure xfermode */
3219 ehc->i.flags |= ATA_EHI_SETMODE;
3220 }
3221
3222 return 0;
3223
3224 err:
3225 *r_failed_dev = dev;
3226 DPRINTK("EXIT rc=%d\n", rc);
Tejun Heo022bdb02006-05-15 20:58:22 +09003227 return rc;
3228}
3229
Tejun Heo6f1d1e32007-11-27 19:28:55 +09003230/**
3231 * ata_set_mode - Program timings and issue SET FEATURES - XFER
3232 * @link: link on which timings will be programmed
Martin Olsson98a17082009-04-22 18:21:29 +02003233 * @r_failed_dev: out parameter for failed device
Tejun Heo6f1d1e32007-11-27 19:28:55 +09003234 *
3235 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
3236 * ata_set_mode() fails, pointer to the failing device is
3237 * returned in @r_failed_dev.
3238 *
3239 * LOCKING:
3240 * PCI/etc. bus probe sem.
3241 *
3242 * RETURNS:
3243 * 0 on success, negative errno otherwise
3244 */
3245int ata_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3246{
3247 struct ata_port *ap = link->ap;
Tejun Heo00115e02007-11-27 19:28:58 +09003248 struct ata_device *dev;
3249 int rc;
Tejun Heo6f1d1e32007-11-27 19:28:55 +09003250
Tejun Heo76326ac2007-11-27 19:28:59 +09003251 /* if data transfer is verified, clear DUBIOUS_XFER on ering top */
Tejun Heo1eca4362008-11-03 20:03:17 +09003252 ata_for_each_dev(dev, link, ENABLED) {
Tejun Heo76326ac2007-11-27 19:28:59 +09003253 if (!(dev->flags & ATA_DFLAG_DUBIOUS_XFER)) {
3254 struct ata_ering_entry *ent;
3255
3256 ent = ata_ering_top(&dev->ering);
3257 if (ent)
3258 ent->eflags &= ~ATA_EFLAG_DUBIOUS_XFER;
3259 }
3260 }
3261
Tejun Heo6f1d1e32007-11-27 19:28:55 +09003262 /* has private set_mode? */
3263 if (ap->ops->set_mode)
Tejun Heo00115e02007-11-27 19:28:58 +09003264 rc = ap->ops->set_mode(link, r_failed_dev);
3265 else
3266 rc = ata_do_set_mode(link, r_failed_dev);
3267
3268 /* if transfer mode has changed, set DUBIOUS_XFER on device */
Tejun Heo1eca4362008-11-03 20:03:17 +09003269 ata_for_each_dev(dev, link, ENABLED) {
Tejun Heo00115e02007-11-27 19:28:58 +09003270 struct ata_eh_context *ehc = &link->eh_context;
3271 u8 saved_xfer_mode = ehc->saved_xfer_mode[dev->devno];
3272 u8 saved_ncq = !!(ehc->saved_ncq_enabled & (1 << dev->devno));
3273
3274 if (dev->xfer_mode != saved_xfer_mode ||
3275 ata_ncq_enabled(dev) != saved_ncq)
3276 dev->flags |= ATA_DFLAG_DUBIOUS_XFER;
3277 }
3278
3279 return rc;
Tejun Heo6f1d1e32007-11-27 19:28:55 +09003280}
3281
Tejun Heo11fc33d2008-08-30 14:20:01 +02003282/**
3283 * atapi_eh_clear_ua - Clear ATAPI UNIT ATTENTION after reset
3284 * @dev: ATAPI device to clear UA for
3285 *
3286 * Resets and other operations can make an ATAPI device raise
3287 * UNIT ATTENTION which causes the next operation to fail. This
3288 * function clears UA.
3289 *
3290 * LOCKING:
3291 * EH context (may sleep).
3292 *
3293 * RETURNS:
3294 * 0 on success, -errno on failure.
3295 */
3296static int atapi_eh_clear_ua(struct ata_device *dev)
3297{
3298 int i;
3299
3300 for (i = 0; i < ATA_EH_UA_TRIES; i++) {
Tejun Heob5357082009-03-02 18:55:16 +09003301 u8 *sense_buffer = dev->link->ap->sector_buf;
Tejun Heo11fc33d2008-08-30 14:20:01 +02003302 u8 sense_key = 0;
3303 unsigned int err_mask;
3304
3305 err_mask = atapi_eh_tur(dev, &sense_key);
3306 if (err_mask != 0 && err_mask != AC_ERR_DEV) {
Joe Perchesa9a79df2011-04-15 15:51:59 -07003307 ata_dev_warn(dev,
3308 "TEST_UNIT_READY failed (err_mask=0x%x)\n",
3309 err_mask);
Tejun Heo11fc33d2008-08-30 14:20:01 +02003310 return -EIO;
3311 }
3312
3313 if (!err_mask || sense_key != UNIT_ATTENTION)
3314 return 0;
3315
3316 err_mask = atapi_eh_request_sense(dev, sense_buffer, sense_key);
3317 if (err_mask) {
Joe Perchesa9a79df2011-04-15 15:51:59 -07003318 ata_dev_warn(dev, "failed to clear "
Tejun Heo11fc33d2008-08-30 14:20:01 +02003319 "UNIT ATTENTION (err_mask=0x%x)\n", err_mask);
3320 return -EIO;
3321 }
3322 }
3323
Joe Perchesa9a79df2011-04-15 15:51:59 -07003324 ata_dev_warn(dev, "UNIT ATTENTION persists after %d tries\n",
3325 ATA_EH_UA_TRIES);
Tejun Heo11fc33d2008-08-30 14:20:01 +02003326
3327 return 0;
3328}
3329
Tejun Heo6013efd2009-11-19 15:36:45 +09003330/**
3331 * ata_eh_maybe_retry_flush - Retry FLUSH if necessary
3332 * @dev: ATA device which may need FLUSH retry
3333 *
3334 * If @dev failed FLUSH, it needs to be reported upper layer
3335 * immediately as it means that @dev failed to remap and already
3336 * lost at least a sector and further FLUSH retrials won't make
3337 * any difference to the lost sector. However, if FLUSH failed
3338 * for other reasons, for example transmission error, FLUSH needs
3339 * to be retried.
3340 *
3341 * This function determines whether FLUSH failure retry is
3342 * necessary and performs it if so.
3343 *
3344 * RETURNS:
3345 * 0 if EH can continue, -errno if EH needs to be repeated.
3346 */
3347static int ata_eh_maybe_retry_flush(struct ata_device *dev)
3348{
3349 struct ata_link *link = dev->link;
3350 struct ata_port *ap = link->ap;
3351 struct ata_queued_cmd *qc;
3352 struct ata_taskfile tf;
3353 unsigned int err_mask;
3354 int rc = 0;
3355
3356 /* did flush fail for this device? */
3357 if (!ata_tag_valid(link->active_tag))
3358 return 0;
3359
3360 qc = __ata_qc_from_tag(ap, link->active_tag);
3361 if (qc->dev != dev || (qc->tf.command != ATA_CMD_FLUSH_EXT &&
3362 qc->tf.command != ATA_CMD_FLUSH))
3363 return 0;
3364
3365 /* if the device failed it, it should be reported to upper layers */
3366 if (qc->err_mask & AC_ERR_DEV)
3367 return 0;
3368
3369 /* flush failed for some other reason, give it another shot */
3370 ata_tf_init(dev, &tf);
3371
3372 tf.command = qc->tf.command;
3373 tf.flags |= ATA_TFLAG_DEVICE;
3374 tf.protocol = ATA_PROT_NODATA;
3375
Joe Perchesa9a79df2011-04-15 15:51:59 -07003376 ata_dev_warn(dev, "retrying FLUSH 0x%x Emask 0x%x\n",
Tejun Heo6013efd2009-11-19 15:36:45 +09003377 tf.command, qc->err_mask);
3378
3379 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
3380 if (!err_mask) {
3381 /*
3382 * FLUSH is complete but there's no way to
3383 * successfully complete a failed command from EH.
3384 * Making sure retry is allowed at least once and
3385 * retrying it should do the trick - whatever was in
3386 * the cache is already on the platter and this won't
3387 * cause infinite loop.
3388 */
3389 qc->scsicmd->allowed = max(qc->scsicmd->allowed, 1);
3390 } else {
Joe Perchesa9a79df2011-04-15 15:51:59 -07003391 ata_dev_warn(dev, "FLUSH failed Emask 0x%x\n",
Tejun Heo6013efd2009-11-19 15:36:45 +09003392 err_mask);
3393 rc = -EIO;
3394
3395 /* if device failed it, report it to upper layers */
3396 if (err_mask & AC_ERR_DEV) {
3397 qc->err_mask |= AC_ERR_DEV;
3398 qc->result_tf = tf;
3399 if (!(ap->pflags & ATA_PFLAG_FROZEN))
3400 rc = 0;
3401 }
3402 }
3403 return rc;
3404}
3405
Tejun Heo6b7ae952010-09-01 17:50:06 +02003406/**
3407 * ata_eh_set_lpm - configure SATA interface power management
3408 * @link: link to configure power management
3409 * @policy: the link power management policy
3410 * @r_failed_dev: out parameter for failed device
3411 *
3412 * Enable SATA Interface power management. This will enable
3413 * Device Interface Power Management (DIPM) for min_power
3414 * policy, and then call driver specific callbacks for
3415 * enabling Host Initiated Power management.
3416 *
3417 * LOCKING:
3418 * EH context.
3419 *
3420 * RETURNS:
3421 * 0 on success, -errno on failure.
3422 */
3423static int ata_eh_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
3424 struct ata_device **r_failed_dev)
3425{
Tejun Heo6c8ea892010-09-01 17:50:07 +02003426 struct ata_port *ap = ata_is_host_link(link) ? link->ap : NULL;
Tejun Heo6b7ae952010-09-01 17:50:06 +02003427 struct ata_eh_context *ehc = &link->eh_context;
3428 struct ata_device *dev, *link_dev = NULL, *lpm_dev = NULL;
Tejun Heoe5005b12010-12-09 16:13:15 +01003429 enum ata_lpm_policy old_policy = link->lpm_policy;
Tejun Heo5f6f12c2011-05-09 16:04:11 +02003430 bool no_dipm = link->ap->flags & ATA_FLAG_NO_DIPM;
Tejun Heo6b7ae952010-09-01 17:50:06 +02003431 unsigned int hints = ATA_LPM_EMPTY | ATA_LPM_HIPM;
3432 unsigned int err_mask;
3433 int rc;
3434
3435 /* if the link or host doesn't do LPM, noop */
3436 if ((link->flags & ATA_LFLAG_NO_LPM) || (ap && !ap->ops->set_lpm))
3437 return 0;
3438
3439 /*
3440 * DIPM is enabled only for MIN_POWER as some devices
3441 * misbehave when the host NACKs transition to SLUMBER. Order
3442 * device and link configurations such that the host always
3443 * allows DIPM requests.
3444 */
3445 ata_for_each_dev(dev, link, ENABLED) {
3446 bool hipm = ata_id_has_hipm(dev->id);
Tejun Heoae01b242011-03-16 11:14:55 +01003447 bool dipm = ata_id_has_dipm(dev->id) && !no_dipm;
Tejun Heo6b7ae952010-09-01 17:50:06 +02003448
3449 /* find the first enabled and LPM enabled devices */
3450 if (!link_dev)
3451 link_dev = dev;
3452
3453 if (!lpm_dev && (hipm || dipm))
3454 lpm_dev = dev;
3455
3456 hints &= ~ATA_LPM_EMPTY;
3457 if (!hipm)
3458 hints &= ~ATA_LPM_HIPM;
3459
3460 /* disable DIPM before changing link config */
3461 if (policy != ATA_LPM_MIN_POWER && dipm) {
3462 err_mask = ata_dev_set_feature(dev,
3463 SETFEATURES_SATA_DISABLE, SATA_DIPM);
3464 if (err_mask && err_mask != AC_ERR_DEV) {
Joe Perchesa9a79df2011-04-15 15:51:59 -07003465 ata_dev_warn(dev,
3466 "failed to disable DIPM, Emask 0x%x\n",
3467 err_mask);
Tejun Heo6b7ae952010-09-01 17:50:06 +02003468 rc = -EIO;
3469 goto fail;
3470 }
3471 }
3472 }
3473
Tejun Heo6c8ea892010-09-01 17:50:07 +02003474 if (ap) {
3475 rc = ap->ops->set_lpm(link, policy, hints);
3476 if (!rc && ap->slave_link)
3477 rc = ap->ops->set_lpm(ap->slave_link, policy, hints);
3478 } else
3479 rc = sata_pmp_set_lpm(link, policy, hints);
Tejun Heo6b7ae952010-09-01 17:50:06 +02003480
3481 /*
3482 * Attribute link config failure to the first (LPM) enabled
3483 * device on the link.
3484 */
3485 if (rc) {
3486 if (rc == -EOPNOTSUPP) {
3487 link->flags |= ATA_LFLAG_NO_LPM;
3488 return 0;
3489 }
3490 dev = lpm_dev ? lpm_dev : link_dev;
3491 goto fail;
3492 }
3493
Tejun Heoe5005b12010-12-09 16:13:15 +01003494 /*
3495 * Low level driver acked the transition. Issue DIPM command
3496 * with the new policy set.
3497 */
3498 link->lpm_policy = policy;
3499 if (ap && ap->slave_link)
3500 ap->slave_link->lpm_policy = policy;
3501
Tejun Heo6b7ae952010-09-01 17:50:06 +02003502 /* host config updated, enable DIPM if transitioning to MIN_POWER */
3503 ata_for_each_dev(dev, link, ENABLED) {
Tejun Heoae01b242011-03-16 11:14:55 +01003504 if (policy == ATA_LPM_MIN_POWER && !no_dipm &&
3505 ata_id_has_dipm(dev->id)) {
Tejun Heo6b7ae952010-09-01 17:50:06 +02003506 err_mask = ata_dev_set_feature(dev,
3507 SETFEATURES_SATA_ENABLE, SATA_DIPM);
3508 if (err_mask && err_mask != AC_ERR_DEV) {
Joe Perchesa9a79df2011-04-15 15:51:59 -07003509 ata_dev_warn(dev,
Tejun Heo6b7ae952010-09-01 17:50:06 +02003510 "failed to enable DIPM, Emask 0x%x\n",
3511 err_mask);
3512 rc = -EIO;
3513 goto fail;
3514 }
3515 }
3516 }
3517
Gabriele Mazzotta09c5b482015-04-25 19:52:37 +02003518 link->last_lpm_change = jiffies;
3519 link->flags |= ATA_LFLAG_CHANGED;
3520
Tejun Heo6b7ae952010-09-01 17:50:06 +02003521 return 0;
3522
3523fail:
Tejun Heoe5005b12010-12-09 16:13:15 +01003524 /* restore the old policy */
3525 link->lpm_policy = old_policy;
3526 if (ap && ap->slave_link)
3527 ap->slave_link->lpm_policy = old_policy;
3528
Tejun Heo6b7ae952010-09-01 17:50:06 +02003529 /* if no device or only one more chance is left, disable LPM */
3530 if (!dev || ehc->tries[dev->devno] <= 2) {
Joe Perchesa9a79df2011-04-15 15:51:59 -07003531 ata_link_warn(link, "disabling LPM on the link\n");
Tejun Heo6b7ae952010-09-01 17:50:06 +02003532 link->flags |= ATA_LFLAG_NO_LPM;
3533 }
3534 if (r_failed_dev)
3535 *r_failed_dev = dev;
3536 return rc;
3537}
3538
Kristen Carlson Accardi8a745f12011-03-04 10:24:11 -08003539int ata_link_nr_enabled(struct ata_link *link)
Tejun Heo022bdb02006-05-15 20:58:22 +09003540{
Tejun Heof58229f2007-08-06 18:36:23 +09003541 struct ata_device *dev;
3542 int cnt = 0;
Tejun Heo022bdb02006-05-15 20:58:22 +09003543
Tejun Heo1eca4362008-11-03 20:03:17 +09003544 ata_for_each_dev(dev, link, ENABLED)
3545 cnt++;
Tejun Heo022bdb02006-05-15 20:58:22 +09003546 return cnt;
3547}
3548
Tejun Heo02607312007-08-06 18:36:23 +09003549static int ata_link_nr_vacant(struct ata_link *link)
Tejun Heo084fe632006-05-31 18:28:03 +09003550{
Tejun Heof58229f2007-08-06 18:36:23 +09003551 struct ata_device *dev;
3552 int cnt = 0;
Tejun Heo084fe632006-05-31 18:28:03 +09003553
Tejun Heo1eca4362008-11-03 20:03:17 +09003554 ata_for_each_dev(dev, link, ALL)
Tejun Heof58229f2007-08-06 18:36:23 +09003555 if (dev->class == ATA_DEV_UNKNOWN)
Tejun Heo084fe632006-05-31 18:28:03 +09003556 cnt++;
3557 return cnt;
3558}
3559
Tejun Heo02607312007-08-06 18:36:23 +09003560static int ata_eh_skip_recovery(struct ata_link *link)
Tejun Heo084fe632006-05-31 18:28:03 +09003561{
Tejun Heo672b2d62008-01-24 00:05:14 +09003562 struct ata_port *ap = link->ap;
Tejun Heo02607312007-08-06 18:36:23 +09003563 struct ata_eh_context *ehc = &link->eh_context;
Tejun Heof58229f2007-08-06 18:36:23 +09003564 struct ata_device *dev;
Tejun Heo084fe632006-05-31 18:28:03 +09003565
Tejun Heof9df58c2007-09-23 13:14:13 +09003566 /* skip disabled links */
3567 if (link->flags & ATA_LFLAG_DISABLED)
3568 return 1;
3569
Tejun Heoe2f3d752010-09-07 14:05:31 +02003570 /* skip if explicitly requested */
3571 if (ehc->i.flags & ATA_EHI_NO_RECOVERY)
3572 return 1;
3573
Tejun Heo672b2d62008-01-24 00:05:14 +09003574 /* thaw frozen port and recover failed devices */
3575 if ((ap->pflags & ATA_PFLAG_FROZEN) || ata_link_nr_enabled(link))
3576 return 0;
3577
3578 /* reset at least once if reset is requested */
3579 if ((ehc->i.action & ATA_EH_RESET) &&
3580 !(ehc->i.flags & ATA_EHI_DID_RESET))
Tejun Heo084fe632006-05-31 18:28:03 +09003581 return 0;
3582
3583 /* skip if class codes for all vacant slots are ATA_DEV_NONE */
Tejun Heo1eca4362008-11-03 20:03:17 +09003584 ata_for_each_dev(dev, link, ALL) {
Tejun Heo084fe632006-05-31 18:28:03 +09003585 if (dev->class == ATA_DEV_UNKNOWN &&
3586 ehc->classes[dev->devno] != ATA_DEV_NONE)
3587 return 0;
3588 }
3589
3590 return 1;
3591}
3592
Tejun Heoc2c7a892009-01-29 20:31:34 +09003593static int ata_count_probe_trials_cb(struct ata_ering_entry *ent, void *void_arg)
3594{
3595 u64 interval = msecs_to_jiffies(ATA_EH_PROBE_TRIAL_INTERVAL);
3596 u64 now = get_jiffies_64();
3597 int *trials = void_arg;
3598
Lin Ming68682252012-05-03 22:15:07 +08003599 if ((ent->eflags & ATA_EFLAG_OLD_ER) ||
3600 (ent->timestamp < now - min(now, interval)))
Tejun Heoc2c7a892009-01-29 20:31:34 +09003601 return -1;
3602
3603 (*trials)++;
3604 return 0;
3605}
3606
Tejun Heo02c05a22007-11-27 19:28:54 +09003607static int ata_eh_schedule_probe(struct ata_device *dev)
3608{
3609 struct ata_eh_context *ehc = &dev->link->eh_context;
Tejun Heoc2c7a892009-01-29 20:31:34 +09003610 struct ata_link *link = ata_dev_phys_link(dev);
3611 int trials = 0;
Tejun Heo02c05a22007-11-27 19:28:54 +09003612
3613 if (!(ehc->i.probe_mask & (1 << dev->devno)) ||
3614 (ehc->did_probe_mask & (1 << dev->devno)))
3615 return 0;
3616
3617 ata_eh_detach_dev(dev);
3618 ata_dev_init(dev);
3619 ehc->did_probe_mask |= (1 << dev->devno);
Tejun Heocf480622008-01-24 00:05:14 +09003620 ehc->i.action |= ATA_EH_RESET;
Tejun Heo00115e02007-11-27 19:28:58 +09003621 ehc->saved_xfer_mode[dev->devno] = 0;
3622 ehc->saved_ncq_enabled &= ~(1 << dev->devno);
Tejun Heo02c05a22007-11-27 19:28:54 +09003623
Tejun Heo6b7ae952010-09-01 17:50:06 +02003624 /* the link maybe in a deep sleep, wake it up */
Tejun Heo6c8ea892010-09-01 17:50:07 +02003625 if (link->lpm_policy > ATA_LPM_MAX_POWER) {
3626 if (ata_is_host_link(link))
3627 link->ap->ops->set_lpm(link, ATA_LPM_MAX_POWER,
3628 ATA_LPM_EMPTY);
3629 else
3630 sata_pmp_set_lpm(link, ATA_LPM_MAX_POWER,
3631 ATA_LPM_EMPTY);
3632 }
Tejun Heo6b7ae952010-09-01 17:50:06 +02003633
Tejun Heoc2c7a892009-01-29 20:31:34 +09003634 /* Record and count probe trials on the ering. The specific
3635 * error mask used is irrelevant. Because a successful device
3636 * detection clears the ering, this count accumulates only if
3637 * there are consecutive failed probes.
3638 *
3639 * If the count is equal to or higher than ATA_EH_PROBE_TRIALS
3640 * in the last ATA_EH_PROBE_TRIAL_INTERVAL, link speed is
3641 * forced to 1.5Gbps.
3642 *
3643 * This is to work around cases where failed link speed
3644 * negotiation results in device misdetection leading to
3645 * infinite DEVXCHG or PHRDY CHG events.
3646 */
3647 ata_ering_record(&dev->ering, 0, AC_ERR_OTHER);
3648 ata_ering_map(&dev->ering, ata_count_probe_trials_cb, &trials);
3649
3650 if (trials > ATA_EH_PROBE_TRIALS)
3651 sata_down_spd_limit(link, 1);
3652
Tejun Heo02c05a22007-11-27 19:28:54 +09003653 return 1;
3654}
3655
Tejun Heo9b1e2652007-08-06 18:36:24 +09003656static int ata_eh_handle_dev_fail(struct ata_device *dev, int err)
Tejun Heofee7ca72007-07-01 19:05:58 +09003657{
Tejun Heo9af5c9c2007-08-06 18:36:22 +09003658 struct ata_eh_context *ehc = &dev->link->eh_context;
Tejun Heofee7ca72007-07-01 19:05:58 +09003659
Tejun Heocf9a5902009-01-29 20:31:35 +09003660 /* -EAGAIN from EH routine indicates retry without prejudice.
3661 * The requester is responsible for ensuring forward progress.
3662 */
3663 if (err != -EAGAIN)
3664 ehc->tries[dev->devno]--;
Tejun Heofee7ca72007-07-01 19:05:58 +09003665
3666 switch (err) {
3667 case -ENODEV:
3668 /* device missing or wrong IDENTIFY data, schedule probing */
3669 ehc->i.probe_mask |= (1 << dev->devno);
3670 case -EINVAL:
3671 /* give it just one more chance */
3672 ehc->tries[dev->devno] = min(ehc->tries[dev->devno], 1);
3673 case -EIO:
Tejun Heod89293a2009-01-29 20:31:29 +09003674 if (ehc->tries[dev->devno] == 1) {
Tejun Heofee7ca72007-07-01 19:05:58 +09003675 /* This is the last chance, better to slow
3676 * down than lose it.
3677 */
Tejun Heoa07d4992009-01-29 20:31:33 +09003678 sata_down_spd_limit(ata_dev_phys_link(dev), 0);
Tejun Heod89293a2009-01-29 20:31:29 +09003679 if (dev->pio_mode > XFER_PIO_0)
3680 ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
Tejun Heofee7ca72007-07-01 19:05:58 +09003681 }
3682 }
3683
3684 if (ata_dev_enabled(dev) && !ehc->tries[dev->devno]) {
3685 /* disable device if it has used up all its chances */
3686 ata_dev_disable(dev);
3687
3688 /* detach if offline */
Tejun Heob1c72912008-07-31 17:02:43 +09003689 if (ata_phys_link_offline(ata_dev_phys_link(dev)))
Tejun Heofee7ca72007-07-01 19:05:58 +09003690 ata_eh_detach_dev(dev);
3691
Tejun Heo02c05a22007-11-27 19:28:54 +09003692 /* schedule probe if necessary */
Tejun Heo87fbc5a2008-05-20 02:17:54 +09003693 if (ata_eh_schedule_probe(dev)) {
Tejun Heofee7ca72007-07-01 19:05:58 +09003694 ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
Tejun Heo87fbc5a2008-05-20 02:17:54 +09003695 memset(ehc->cmd_timeout_idx[dev->devno], 0,
3696 sizeof(ehc->cmd_timeout_idx[dev->devno]));
3697 }
Tejun Heo9b1e2652007-08-06 18:36:24 +09003698
3699 return 1;
Tejun Heofee7ca72007-07-01 19:05:58 +09003700 } else {
Tejun Heocf480622008-01-24 00:05:14 +09003701 ehc->i.action |= ATA_EH_RESET;
Tejun Heo9b1e2652007-08-06 18:36:24 +09003702 return 0;
Tejun Heofee7ca72007-07-01 19:05:58 +09003703 }
3704}
3705
Tejun Heo022bdb02006-05-15 20:58:22 +09003706/**
3707 * ata_eh_recover - recover host port after error
3708 * @ap: host port to recover
Tejun Heof5914a42006-05-31 18:27:48 +09003709 * @prereset: prereset method (can be NULL)
Tejun Heo022bdb02006-05-15 20:58:22 +09003710 * @softreset: softreset method (can be NULL)
3711 * @hardreset: hardreset method (can be NULL)
3712 * @postreset: postreset method (can be NULL)
Tejun Heo9b1e2652007-08-06 18:36:24 +09003713 * @r_failed_link: out parameter for failed link
Tejun Heo022bdb02006-05-15 20:58:22 +09003714 *
3715 * This is the alpha and omega, eum and yang, heart and soul of
3716 * libata exception handling. On entry, actions required to
Tejun Heo9b1e2652007-08-06 18:36:24 +09003717 * recover each link and hotplug requests are recorded in the
3718 * link's eh_context. This function executes all the operations
3719 * with appropriate retrials and fallbacks to resurrect failed
Tejun Heo084fe632006-05-31 18:28:03 +09003720 * devices, detach goners and greet newcomers.
Tejun Heo022bdb02006-05-15 20:58:22 +09003721 *
3722 * LOCKING:
3723 * Kernel thread context (may sleep).
3724 *
3725 * RETURNS:
3726 * 0 on success, -errno on failure.
3727 */
Tejun Heofb7fd612007-09-23 13:14:12 +09003728int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
3729 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
3730 ata_postreset_fn_t postreset,
3731 struct ata_link **r_failed_link)
Tejun Heo022bdb02006-05-15 20:58:22 +09003732{
Tejun Heo9b1e2652007-08-06 18:36:24 +09003733 struct ata_link *link;
Tejun Heo022bdb02006-05-15 20:58:22 +09003734 struct ata_device *dev;
Tejun Heo6b7ae952010-09-01 17:50:06 +02003735 int rc, nr_fails;
Elias Oltmanns45fabbb2008-09-21 11:54:08 +02003736 unsigned long flags, deadline;
Tejun Heo022bdb02006-05-15 20:58:22 +09003737
3738 DPRINTK("ENTER\n");
3739
3740 /* prep for recovery */
Tejun Heo1eca4362008-11-03 20:03:17 +09003741 ata_for_each_link(link, ap, EDGE) {
Tejun Heo9b1e2652007-08-06 18:36:24 +09003742 struct ata_eh_context *ehc = &link->eh_context;
Tejun Heo084fe632006-05-31 18:28:03 +09003743
Tejun Heof9df58c2007-09-23 13:14:13 +09003744 /* re-enable link? */
3745 if (ehc->i.action & ATA_EH_ENABLE_LINK) {
3746 ata_eh_about_to_do(link, NULL, ATA_EH_ENABLE_LINK);
3747 spin_lock_irqsave(ap->lock, flags);
3748 link->flags &= ~ATA_LFLAG_DISABLED;
3749 spin_unlock_irqrestore(ap->lock, flags);
3750 ata_eh_done(link, NULL, ATA_EH_ENABLE_LINK);
3751 }
3752
Tejun Heo1eca4362008-11-03 20:03:17 +09003753 ata_for_each_dev(dev, link, ALL) {
Tejun Heofd995f72007-09-23 13:14:12 +09003754 if (link->flags & ATA_LFLAG_NO_RETRY)
3755 ehc->tries[dev->devno] = 1;
3756 else
3757 ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
Tejun Heo79a55b72007-01-18 17:22:18 +09003758
Tejun Heo9b1e2652007-08-06 18:36:24 +09003759 /* collect port action mask recorded in dev actions */
3760 ehc->i.action |= ehc->i.dev_action[dev->devno] &
3761 ~ATA_EH_PERDEV_MASK;
3762 ehc->i.dev_action[dev->devno] &= ATA_EH_PERDEV_MASK;
Tejun Heo084fe632006-05-31 18:28:03 +09003763
Tejun Heo9b1e2652007-08-06 18:36:24 +09003764 /* process hotplug request */
3765 if (dev->flags & ATA_DFLAG_DETACH)
3766 ata_eh_detach_dev(dev);
3767
Tejun Heo02c05a22007-11-27 19:28:54 +09003768 /* schedule probe if necessary */
3769 if (!ata_dev_enabled(dev))
3770 ata_eh_schedule_probe(dev);
Tejun Heo084fe632006-05-31 18:28:03 +09003771 }
Tejun Heo022bdb02006-05-15 20:58:22 +09003772 }
3773
3774 retry:
Tejun Heo022bdb02006-05-15 20:58:22 +09003775 rc = 0;
3776
Tejun Heoaeb2ecd2006-06-12 14:11:43 +09003777 /* if UNLOADING, finish immediately */
Tejun Heob51e9e52006-06-29 01:29:30 +09003778 if (ap->pflags & ATA_PFLAG_UNLOADING)
Tejun Heoaeb2ecd2006-06-12 14:11:43 +09003779 goto out;
3780
Tejun Heo9b1e2652007-08-06 18:36:24 +09003781 /* prep for EH */
Tejun Heo1eca4362008-11-03 20:03:17 +09003782 ata_for_each_link(link, ap, EDGE) {
Tejun Heo9b1e2652007-08-06 18:36:24 +09003783 struct ata_eh_context *ehc = &link->eh_context;
Tejun Heo022bdb02006-05-15 20:58:22 +09003784
Tejun Heo9b1e2652007-08-06 18:36:24 +09003785 /* skip EH if possible. */
3786 if (ata_eh_skip_recovery(link))
3787 ehc->i.action = 0;
3788
Tejun Heo1eca4362008-11-03 20:03:17 +09003789 ata_for_each_dev(dev, link, ALL)
Tejun Heo9b1e2652007-08-06 18:36:24 +09003790 ehc->classes[dev->devno] = ATA_DEV_UNKNOWN;
3791 }
Tejun Heo084fe632006-05-31 18:28:03 +09003792
Tejun Heo022bdb02006-05-15 20:58:22 +09003793 /* reset */
Tejun Heo1eca4362008-11-03 20:03:17 +09003794 ata_for_each_link(link, ap, EDGE) {
Tejun Heodc98c322008-05-19 01:15:07 +09003795 struct ata_eh_context *ehc = &link->eh_context;
Tejun Heo022bdb02006-05-15 20:58:22 +09003796
Tejun Heodc98c322008-05-19 01:15:07 +09003797 if (!(ehc->i.action & ATA_EH_RESET))
3798 continue;
Tejun Heo9b1e2652007-08-06 18:36:24 +09003799
Tejun Heodc98c322008-05-19 01:15:07 +09003800 rc = ata_eh_reset(link, ata_link_nr_vacant(link),
3801 prereset, softreset, hardreset, postreset);
3802 if (rc) {
Joe Perchesa9a79df2011-04-15 15:51:59 -07003803 ata_link_err(link, "reset failed, giving up\n");
Tejun Heodc98c322008-05-19 01:15:07 +09003804 goto out;
Tejun Heo022bdb02006-05-15 20:58:22 +09003805 }
Tejun Heo022bdb02006-05-15 20:58:22 +09003806 }
3807
Elias Oltmanns45fabbb2008-09-21 11:54:08 +02003808 do {
3809 unsigned long now;
3810
3811 /*
3812 * clears ATA_EH_PARK in eh_info and resets
3813 * ap->park_req_pending
3814 */
3815 ata_eh_pull_park_action(ap);
3816
3817 deadline = jiffies;
Tejun Heo1eca4362008-11-03 20:03:17 +09003818 ata_for_each_link(link, ap, EDGE) {
3819 ata_for_each_dev(dev, link, ALL) {
Elias Oltmanns45fabbb2008-09-21 11:54:08 +02003820 struct ata_eh_context *ehc = &link->eh_context;
3821 unsigned long tmp;
3822
Hannes Reinecke9162c652014-11-05 13:08:21 +01003823 if (dev->class != ATA_DEV_ATA &&
3824 dev->class != ATA_DEV_ZAC)
Elias Oltmanns45fabbb2008-09-21 11:54:08 +02003825 continue;
3826 if (!(ehc->i.dev_action[dev->devno] &
3827 ATA_EH_PARK))
3828 continue;
3829 tmp = dev->unpark_deadline;
3830 if (time_before(deadline, tmp))
3831 deadline = tmp;
3832 else if (time_before_eq(tmp, jiffies))
3833 continue;
3834 if (ehc->unloaded_mask & (1 << dev->devno))
3835 continue;
3836
3837 ata_eh_park_issue_cmd(dev, 1);
3838 }
3839 }
3840
3841 now = jiffies;
3842 if (time_before_eq(deadline, now))
3843 break;
3844
Tejun Heoc0c362b2010-09-06 17:57:14 +02003845 ata_eh_release(ap);
Elias Oltmanns45fabbb2008-09-21 11:54:08 +02003846 deadline = wait_for_completion_timeout(&ap->park_req_pending,
3847 deadline - now);
Tejun Heoc0c362b2010-09-06 17:57:14 +02003848 ata_eh_acquire(ap);
Elias Oltmanns45fabbb2008-09-21 11:54:08 +02003849 } while (deadline);
Tejun Heo1eca4362008-11-03 20:03:17 +09003850 ata_for_each_link(link, ap, EDGE) {
3851 ata_for_each_dev(dev, link, ALL) {
Elias Oltmanns45fabbb2008-09-21 11:54:08 +02003852 if (!(link->eh_context.unloaded_mask &
3853 (1 << dev->devno)))
3854 continue;
3855
3856 ata_eh_park_issue_cmd(dev, 0);
3857 ata_eh_done(link, dev, ATA_EH_PARK);
3858 }
3859 }
3860
Tejun Heo9b1e2652007-08-06 18:36:24 +09003861 /* the rest */
Tejun Heo6b7ae952010-09-01 17:50:06 +02003862 nr_fails = 0;
3863 ata_for_each_link(link, ap, PMP_FIRST) {
Tejun Heo9b1e2652007-08-06 18:36:24 +09003864 struct ata_eh_context *ehc = &link->eh_context;
Tejun Heo022bdb02006-05-15 20:58:22 +09003865
Tejun Heo6b7ae952010-09-01 17:50:06 +02003866 if (sata_pmp_attached(ap) && ata_is_host_link(link))
3867 goto config_lpm;
3868
Tejun Heo9b1e2652007-08-06 18:36:24 +09003869 /* revalidate existing devices and attach new ones */
3870 rc = ata_eh_revalidate_and_attach(link, &dev);
Tejun Heo4ae72a12007-02-02 16:22:30 +09003871 if (rc)
Tejun Heo6b7ae952010-09-01 17:50:06 +02003872 goto rest_fail;
Tejun Heo9b1e2652007-08-06 18:36:24 +09003873
Tejun Heo633273a32007-09-23 13:19:54 +09003874 /* if PMP got attached, return, pmp EH will take care of it */
3875 if (link->device->class == ATA_DEV_PMP) {
3876 ehc->i.action = 0;
3877 return 0;
3878 }
3879
Tejun Heo9b1e2652007-08-06 18:36:24 +09003880 /* configure transfer mode if necessary */
3881 if (ehc->i.flags & ATA_EHI_SETMODE) {
3882 rc = ata_set_mode(link, &dev);
3883 if (rc)
Tejun Heo6b7ae952010-09-01 17:50:06 +02003884 goto rest_fail;
Tejun Heo9b1e2652007-08-06 18:36:24 +09003885 ehc->i.flags &= ~ATA_EHI_SETMODE;
3886 }
3887
Tejun Heo11fc33d2008-08-30 14:20:01 +02003888 /* If reset has been issued, clear UA to avoid
3889 * disrupting the current users of the device.
3890 */
3891 if (ehc->i.flags & ATA_EHI_DID_RESET) {
Tejun Heo1eca4362008-11-03 20:03:17 +09003892 ata_for_each_dev(dev, link, ALL) {
Tejun Heo11fc33d2008-08-30 14:20:01 +02003893 if (dev->class != ATA_DEV_ATAPI)
3894 continue;
3895 rc = atapi_eh_clear_ua(dev);
3896 if (rc)
Tejun Heo6b7ae952010-09-01 17:50:06 +02003897 goto rest_fail;
Aaron Lu21334202013-01-15 17:21:01 +08003898 if (zpodd_dev_enabled(dev))
3899 zpodd_post_poweron(dev);
Tejun Heo11fc33d2008-08-30 14:20:01 +02003900 }
3901 }
3902
Tejun Heo6013efd2009-11-19 15:36:45 +09003903 /* retry flush if necessary */
3904 ata_for_each_dev(dev, link, ALL) {
Hannes Reinecke9162c652014-11-05 13:08:21 +01003905 if (dev->class != ATA_DEV_ATA &&
3906 dev->class != ATA_DEV_ZAC)
Tejun Heo6013efd2009-11-19 15:36:45 +09003907 continue;
3908 rc = ata_eh_maybe_retry_flush(dev);
3909 if (rc)
Tejun Heo6b7ae952010-09-01 17:50:06 +02003910 goto rest_fail;
Tejun Heo6013efd2009-11-19 15:36:45 +09003911 }
3912
Tejun Heo6b7ae952010-09-01 17:50:06 +02003913 config_lpm:
Tejun Heo11fc33d2008-08-30 14:20:01 +02003914 /* configure link power saving */
Tejun Heo6b7ae952010-09-01 17:50:06 +02003915 if (link->lpm_policy != ap->target_lpm_policy) {
3916 rc = ata_eh_set_lpm(link, ap->target_lpm_policy, &dev);
3917 if (rc)
3918 goto rest_fail;
3919 }
Kristen Carlson Accardica773292007-10-25 00:58:59 -04003920
Tejun Heo9b1e2652007-08-06 18:36:24 +09003921 /* this link is okay now */
3922 ehc->i.flags = 0;
3923 continue;
3924
Tejun Heo6b7ae952010-09-01 17:50:06 +02003925 rest_fail:
3926 nr_fails++;
3927 if (dev)
3928 ata_eh_handle_dev_fail(dev, rc);
Tejun Heo9b1e2652007-08-06 18:36:24 +09003929
Tejun Heob06ce3e2007-10-09 15:06:48 +09003930 if (ap->pflags & ATA_PFLAG_FROZEN) {
3931 /* PMP reset requires working host port.
3932 * Can't retry if it's frozen.
3933 */
Tejun Heo071f44b2008-04-07 22:47:22 +09003934 if (sata_pmp_attached(ap))
Tejun Heob06ce3e2007-10-09 15:06:48 +09003935 goto out;
Tejun Heo9b1e2652007-08-06 18:36:24 +09003936 break;
Tejun Heob06ce3e2007-10-09 15:06:48 +09003937 }
Tejun Heo022bdb02006-05-15 20:58:22 +09003938 }
3939
Tejun Heo6b7ae952010-09-01 17:50:06 +02003940 if (nr_fails)
Tejun Heo9b1e2652007-08-06 18:36:24 +09003941 goto retry;
Tejun Heo022bdb02006-05-15 20:58:22 +09003942
Tejun Heo022bdb02006-05-15 20:58:22 +09003943 out:
Tejun Heo9b1e2652007-08-06 18:36:24 +09003944 if (rc && r_failed_link)
3945 *r_failed_link = link;
Tejun Heo022bdb02006-05-15 20:58:22 +09003946
3947 DPRINTK("EXIT, rc=%d\n", rc);
3948 return rc;
3949}
3950
3951/**
3952 * ata_eh_finish - finish up EH
3953 * @ap: host port to finish EH for
3954 *
3955 * Recovery is complete. Clean up EH states and retry or finish
3956 * failed qcs.
3957 *
3958 * LOCKING:
3959 * None.
3960 */
Tejun Heofb7fd612007-09-23 13:14:12 +09003961void ata_eh_finish(struct ata_port *ap)
Tejun Heo022bdb02006-05-15 20:58:22 +09003962{
3963 int tag;
3964
3965 /* retry or finish qcs */
3966 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
3967 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
3968
3969 if (!(qc->flags & ATA_QCFLAG_FAILED))
3970 continue;
3971
3972 if (qc->err_mask) {
3973 /* FIXME: Once EH migration is complete,
3974 * generate sense data in this function,
3975 * considering both err_mask and tf.
3976 */
Tejun Heo03faab72008-03-27 19:14:24 +09003977 if (qc->flags & ATA_QCFLAG_RETRY)
Tejun Heo022bdb02006-05-15 20:58:22 +09003978 ata_eh_qc_retry(qc);
Tejun Heo03faab72008-03-27 19:14:24 +09003979 else
3980 ata_eh_qc_complete(qc);
Tejun Heo022bdb02006-05-15 20:58:22 +09003981 } else {
3982 if (qc->flags & ATA_QCFLAG_SENSE_VALID) {
3983 ata_eh_qc_complete(qc);
3984 } else {
3985 /* feed zero TF to sense generation */
3986 memset(&qc->result_tf, 0, sizeof(qc->result_tf));
3987 ata_eh_qc_retry(qc);
3988 }
3989 }
3990 }
Tejun Heoda917d62007-09-23 13:14:12 +09003991
3992 /* make sure nr_active_links is zero after EH */
3993 WARN_ON(ap->nr_active_links);
3994 ap->nr_active_links = 0;
Tejun Heo022bdb02006-05-15 20:58:22 +09003995}
3996
3997/**
3998 * ata_do_eh - do standard error handling
3999 * @ap: host port to handle error for
Tejun Heoa1efdab2008-03-25 12:22:50 +09004000 *
Tejun Heof5914a42006-05-31 18:27:48 +09004001 * @prereset: prereset method (can be NULL)
Tejun Heo022bdb02006-05-15 20:58:22 +09004002 * @softreset: softreset method (can be NULL)
4003 * @hardreset: hardreset method (can be NULL)
4004 * @postreset: postreset method (can be NULL)
4005 *
4006 * Perform standard error handling sequence.
4007 *
4008 * LOCKING:
4009 * Kernel thread context (may sleep).
4010 */
Tejun Heof5914a42006-05-31 18:27:48 +09004011void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
4012 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
4013 ata_postreset_fn_t postreset)
Tejun Heo022bdb02006-05-15 20:58:22 +09004014{
Tejun Heo9b1e2652007-08-06 18:36:24 +09004015 struct ata_device *dev;
4016 int rc;
4017
4018 ata_eh_autopsy(ap);
4019 ata_eh_report(ap);
4020
4021 rc = ata_eh_recover(ap, prereset, softreset, hardreset, postreset,
4022 NULL);
4023 if (rc) {
Tejun Heo1eca4362008-11-03 20:03:17 +09004024 ata_for_each_dev(dev, &ap->link, ALL)
Tejun Heo9b1e2652007-08-06 18:36:24 +09004025 ata_dev_disable(dev);
4026 }
4027
Tejun Heo022bdb02006-05-15 20:58:22 +09004028 ata_eh_finish(ap);
4029}
Tejun Heo500530f2006-07-03 16:07:27 +09004030
Tejun Heoa1efdab2008-03-25 12:22:50 +09004031/**
4032 * ata_std_error_handler - standard error handler
4033 * @ap: host port to handle error for
4034 *
4035 * Standard error handler
4036 *
4037 * LOCKING:
4038 * Kernel thread context (may sleep).
4039 */
4040void ata_std_error_handler(struct ata_port *ap)
4041{
4042 struct ata_port_operations *ops = ap->ops;
4043 ata_reset_fn_t hardreset = ops->hardreset;
4044
Tejun Heo57c9efd2008-04-07 22:47:19 +09004045 /* ignore built-in hardreset if SCR access is not available */
Tejun Heofe06e5f2010-05-10 21:41:39 +02004046 if (hardreset == sata_std_hardreset && !sata_scr_valid(&ap->link))
Tejun Heoa1efdab2008-03-25 12:22:50 +09004047 hardreset = NULL;
4048
4049 ata_do_eh(ap, ops->prereset, ops->softreset, hardreset, ops->postreset);
4050}
4051
Tejun Heo6ffa01d2007-03-02 17:32:47 +09004052#ifdef CONFIG_PM
Tejun Heo500530f2006-07-03 16:07:27 +09004053/**
4054 * ata_eh_handle_port_suspend - perform port suspend operation
4055 * @ap: port to suspend
4056 *
4057 * Suspend @ap.
4058 *
4059 * LOCKING:
4060 * Kernel thread context (may sleep).
4061 */
4062static void ata_eh_handle_port_suspend(struct ata_port *ap)
4063{
4064 unsigned long flags;
4065 int rc = 0;
Aaron Lu3dc67442013-01-15 17:21:00 +08004066 struct ata_device *dev;
Tejun Heo500530f2006-07-03 16:07:27 +09004067
4068 /* are we suspending? */
4069 spin_lock_irqsave(ap->lock, flags);
4070 if (!(ap->pflags & ATA_PFLAG_PM_PENDING) ||
Aaron Lua7ff60d2013-01-25 14:29:35 +08004071 ap->pm_mesg.event & PM_EVENT_RESUME) {
Tejun Heo500530f2006-07-03 16:07:27 +09004072 spin_unlock_irqrestore(ap->lock, flags);
4073 return;
4074 }
4075 spin_unlock_irqrestore(ap->lock, flags);
4076
4077 WARN_ON(ap->pflags & ATA_PFLAG_SUSPENDED);
4078
Aaron Lu3dc67442013-01-15 17:21:00 +08004079 /*
4080 * If we have a ZPODD attached, check its zero
4081 * power ready status before the port is frozen.
Aaron Lua7ff60d2013-01-25 14:29:35 +08004082 * Only needed for runtime suspend.
Aaron Lu3dc67442013-01-15 17:21:00 +08004083 */
Aaron Lua7ff60d2013-01-25 14:29:35 +08004084 if (PMSG_IS_AUTO(ap->pm_mesg)) {
4085 ata_for_each_dev(dev, &ap->link, ENABLED) {
4086 if (zpodd_dev_enabled(dev))
4087 zpodd_on_suspend(dev);
4088 }
Aaron Lu3dc67442013-01-15 17:21:00 +08004089 }
4090
Tejun Heo64578a32007-05-15 03:28:16 +09004091 /* tell ACPI we're suspending */
4092 rc = ata_acpi_on_suspend(ap);
4093 if (rc)
4094 goto out;
4095
Tejun Heo500530f2006-07-03 16:07:27 +09004096 /* suspend */
4097 ata_eh_freeze_port(ap);
4098
4099 if (ap->ops->port_suspend)
4100 rc = ap->ops->port_suspend(ap, ap->pm_mesg);
4101
Aaron Lua7ff60d2013-01-25 14:29:35 +08004102 ata_acpi_set_state(ap, ap->pm_mesg);
Tejun Heo64578a32007-05-15 03:28:16 +09004103 out:
Dan Williamsbc6e7c42014-03-14 13:52:48 -07004104 /* update the flags */
Tejun Heo500530f2006-07-03 16:07:27 +09004105 spin_lock_irqsave(ap->lock, flags);
4106
4107 ap->pflags &= ~ATA_PFLAG_PM_PENDING;
4108 if (rc == 0)
4109 ap->pflags |= ATA_PFLAG_SUSPENDED;
Tejun Heo64578a32007-05-15 03:28:16 +09004110 else if (ap->pflags & ATA_PFLAG_FROZEN)
Tejun Heo500530f2006-07-03 16:07:27 +09004111 ata_port_schedule_eh(ap);
4112
Tejun Heo500530f2006-07-03 16:07:27 +09004113 spin_unlock_irqrestore(ap->lock, flags);
4114
4115 return;
4116}
4117
4118/**
4119 * ata_eh_handle_port_resume - perform port resume operation
4120 * @ap: port to resume
4121 *
4122 * Resume @ap.
4123 *
Tejun Heo500530f2006-07-03 16:07:27 +09004124 * LOCKING:
4125 * Kernel thread context (may sleep).
4126 */
4127static void ata_eh_handle_port_resume(struct ata_port *ap)
4128{
Tejun Heo6f9c1ea2009-04-23 09:55:28 +09004129 struct ata_link *link;
4130 struct ata_device *dev;
Tejun Heo500530f2006-07-03 16:07:27 +09004131 unsigned long flags;
Tejun Heo9666f402007-05-04 21:27:47 +02004132 int rc = 0;
Tejun Heo500530f2006-07-03 16:07:27 +09004133
4134 /* are we resuming? */
4135 spin_lock_irqsave(ap->lock, flags);
4136 if (!(ap->pflags & ATA_PFLAG_PM_PENDING) ||
Aaron Lua7ff60d2013-01-25 14:29:35 +08004137 !(ap->pm_mesg.event & PM_EVENT_RESUME)) {
Tejun Heo500530f2006-07-03 16:07:27 +09004138 spin_unlock_irqrestore(ap->lock, flags);
4139 return;
4140 }
4141 spin_unlock_irqrestore(ap->lock, flags);
4142
Tejun Heo9666f402007-05-04 21:27:47 +02004143 WARN_ON(!(ap->pflags & ATA_PFLAG_SUSPENDED));
Tejun Heo500530f2006-07-03 16:07:27 +09004144
Tejun Heo6f9c1ea2009-04-23 09:55:28 +09004145 /*
4146 * Error timestamps are in jiffies which doesn't run while
4147 * suspended and PHY events during resume isn't too uncommon.
4148 * When the two are combined, it can lead to unnecessary speed
4149 * downs if the machine is suspended and resumed repeatedly.
4150 * Clear error history.
4151 */
4152 ata_for_each_link(link, ap, HOST_FIRST)
4153 ata_for_each_dev(dev, link, ALL)
4154 ata_ering_clear(&dev->ering);
4155
Aaron Lua7ff60d2013-01-25 14:29:35 +08004156 ata_acpi_set_state(ap, ap->pm_mesg);
Shaohua Libd3adca2007-11-02 09:32:38 +08004157
Tejun Heo500530f2006-07-03 16:07:27 +09004158 if (ap->ops->port_resume)
4159 rc = ap->ops->port_resume(ap);
4160
Tejun Heo67465442007-05-15 03:28:16 +09004161 /* tell ACPI that we're resuming */
4162 ata_acpi_on_resume(ap);
4163
Dan Williamsbc6e7c42014-03-14 13:52:48 -07004164 /* update the flags */
Tejun Heo500530f2006-07-03 16:07:27 +09004165 spin_lock_irqsave(ap->lock, flags);
4166 ap->pflags &= ~(ATA_PFLAG_PM_PENDING | ATA_PFLAG_SUSPENDED);
Tejun Heo500530f2006-07-03 16:07:27 +09004167 spin_unlock_irqrestore(ap->lock, flags);
4168}
Tejun Heo6ffa01d2007-03-02 17:32:47 +09004169#endif /* CONFIG_PM */