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Tejun Heoece1d632006-04-02 18:51:53 +09001/*
2 * libata-eh.c - libata error handling
3 *
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
6 * on emails.
7 *
8 * Copyright 2006 Tejun Heo <htejun@gmail.com>
9 *
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; see the file COPYING. If not, write to
23 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
24 * USA.
25 *
26 *
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
29 *
30 * Hardware documentation available from http://www.t13.org/ and
31 * http://www.sata-io.org/
32 *
33 */
34
Tejun Heoece1d632006-04-02 18:51:53 +090035#include <linux/kernel.h>
Jens Axboe242f9dc2008-09-14 05:55:09 -070036#include <linux/blkdev.h>
Jeff Garzik28555682007-10-11 17:12:35 -040037#include <linux/pci.h>
Tejun Heoece1d632006-04-02 18:51:53 +090038#include <scsi/scsi.h>
39#include <scsi/scsi_host.h>
40#include <scsi/scsi_eh.h>
41#include <scsi/scsi_device.h>
42#include <scsi/scsi_cmnd.h>
Robert Hancock65211482009-07-14 20:43:39 -060043#include <scsi/scsi_dbg.h>
Jeff Garzikc6fd2802006-08-10 07:31:37 -040044#include "../scsi/scsi_transport_api.h"
Tejun Heoece1d632006-04-02 18:51:53 +090045
46#include <linux/libata.h>
47
48#include "libata.h"
49
Tejun Heo7d47e8d2007-02-02 16:22:31 +090050enum {
Tejun Heo3884f7b2007-11-27 19:28:56 +090051 /* speed down verdicts */
Tejun Heo7d47e8d2007-02-02 16:22:31 +090052 ATA_EH_SPDN_NCQ_OFF = (1 << 0),
53 ATA_EH_SPDN_SPEED_DOWN = (1 << 1),
54 ATA_EH_SPDN_FALLBACK_TO_PIO = (1 << 2),
Tejun Heo76326ac2007-11-27 19:28:59 +090055 ATA_EH_SPDN_KEEP_ERRORS = (1 << 3),
Tejun Heo3884f7b2007-11-27 19:28:56 +090056
57 /* error flags */
58 ATA_EFLAG_IS_IO = (1 << 0),
Tejun Heo76326ac2007-11-27 19:28:59 +090059 ATA_EFLAG_DUBIOUS_XFER = (1 << 1),
Gwendal Grignoud9027472010-05-25 12:31:38 -070060 ATA_EFLAG_OLD_ER = (1 << 31),
Tejun Heo3884f7b2007-11-27 19:28:56 +090061
62 /* error categories */
63 ATA_ECAT_NONE = 0,
64 ATA_ECAT_ATA_BUS = 1,
65 ATA_ECAT_TOUT_HSM = 2,
66 ATA_ECAT_UNK_DEV = 3,
Tejun Heo75f9caf2008-01-03 01:21:14 +090067 ATA_ECAT_DUBIOUS_NONE = 4,
68 ATA_ECAT_DUBIOUS_ATA_BUS = 5,
69 ATA_ECAT_DUBIOUS_TOUT_HSM = 6,
70 ATA_ECAT_DUBIOUS_UNK_DEV = 7,
71 ATA_ECAT_NR = 8,
Tejun Heo7d47e8d2007-02-02 16:22:31 +090072
Tejun Heo87fbc5a2008-05-20 02:17:54 +090073 ATA_EH_CMD_DFL_TIMEOUT = 5000,
74
Tejun Heo0a2c0f52008-05-20 02:17:52 +090075 /* always put at least this amount of time between resets */
76 ATA_EH_RESET_COOL_DOWN = 5000,
77
Tejun Heo341c2c92008-05-20 02:17:51 +090078 /* Waiting in ->prereset can never be reliable. It's
79 * sometimes nice to wait there but it can't be depended upon;
80 * otherwise, we wouldn't be resetting. Just give it enough
81 * time for most drives to spin up.
82 */
83 ATA_EH_PRERESET_TIMEOUT = 10000,
84 ATA_EH_FASTDRAIN_INTERVAL = 3000,
Tejun Heo11fc33d2008-08-30 14:20:01 +020085
86 ATA_EH_UA_TRIES = 5,
Tejun Heoc2c7a892009-01-29 20:31:34 +090087
88 /* probe speed down parameters, see ata_eh_schedule_probe() */
89 ATA_EH_PROBE_TRIAL_INTERVAL = 60000, /* 1 min */
90 ATA_EH_PROBE_TRIALS = 2,
Tejun Heo31daabd2007-02-02 16:50:52 +090091};
92
93/* The following table determines how we sequence resets. Each entry
94 * represents timeout for that try. The first try can be soft or
95 * hardreset. All others are hardreset if available. In most cases
96 * the first reset w/ 10sec timeout should succeed. Following entries
97 * are mostly for error handling, hotplug and retarded devices.
98 */
99static const unsigned long ata_eh_reset_timeouts[] = {
Tejun Heo341c2c92008-05-20 02:17:51 +0900100 10000, /* most drives spin up by 10sec */
101 10000, /* > 99% working drives spin up before 20sec */
102 35000, /* give > 30 secs of idleness for retarded devices */
103 5000, /* and sweet one last chance */
Tejun Heod8af0eb2008-05-20 02:17:53 +0900104 ULONG_MAX, /* > 1 min has elapsed, give up */
Tejun Heo31daabd2007-02-02 16:50:52 +0900105};
106
Tejun Heo87fbc5a2008-05-20 02:17:54 +0900107static const unsigned long ata_eh_identify_timeouts[] = {
108 5000, /* covers > 99% of successes and not too boring on failures */
109 10000, /* combined time till here is enough even for media access */
110 30000, /* for true idiots */
111 ULONG_MAX,
112};
113
Tejun Heo6013efd2009-11-19 15:36:45 +0900114static const unsigned long ata_eh_flush_timeouts[] = {
115 15000, /* be generous with flush */
116 15000, /* ditto */
117 30000, /* and even more generous */
118 ULONG_MAX,
119};
120
Tejun Heo87fbc5a2008-05-20 02:17:54 +0900121static const unsigned long ata_eh_other_timeouts[] = {
122 5000, /* same rationale as identify timeout */
123 10000, /* ditto */
124 /* but no merciful 30sec for other commands, it just isn't worth it */
125 ULONG_MAX,
126};
127
128struct ata_eh_cmd_timeout_ent {
129 const u8 *commands;
130 const unsigned long *timeouts;
131};
132
133/* The following table determines timeouts to use for EH internal
134 * commands. Each table entry is a command class and matches the
135 * commands the entry applies to and the timeout table to use.
136 *
137 * On the retry after a command timed out, the next timeout value from
138 * the table is used. If the table doesn't contain further entries,
139 * the last value is used.
140 *
141 * ehc->cmd_timeout_idx keeps track of which timeout to use per
142 * command class, so if SET_FEATURES times out on the first try, the
143 * next try will use the second timeout value only for that class.
144 */
145#define CMDS(cmds...) (const u8 []){ cmds, 0 }
146static const struct ata_eh_cmd_timeout_ent
147ata_eh_cmd_timeout_table[ATA_EH_CMD_TIMEOUT_TABLE_SIZE] = {
148 { .commands = CMDS(ATA_CMD_ID_ATA, ATA_CMD_ID_ATAPI),
149 .timeouts = ata_eh_identify_timeouts, },
150 { .commands = CMDS(ATA_CMD_READ_NATIVE_MAX, ATA_CMD_READ_NATIVE_MAX_EXT),
151 .timeouts = ata_eh_other_timeouts, },
152 { .commands = CMDS(ATA_CMD_SET_MAX, ATA_CMD_SET_MAX_EXT),
153 .timeouts = ata_eh_other_timeouts, },
154 { .commands = CMDS(ATA_CMD_SET_FEATURES),
155 .timeouts = ata_eh_other_timeouts, },
156 { .commands = CMDS(ATA_CMD_INIT_DEV_PARAMS),
157 .timeouts = ata_eh_other_timeouts, },
Tejun Heo6013efd2009-11-19 15:36:45 +0900158 { .commands = CMDS(ATA_CMD_FLUSH, ATA_CMD_FLUSH_EXT),
159 .timeouts = ata_eh_flush_timeouts },
Tejun Heo87fbc5a2008-05-20 02:17:54 +0900160};
161#undef CMDS
162
Tejun Heoad9e2762006-05-15 20:58:12 +0900163static void __ata_port_freeze(struct ata_port *ap);
Tejun Heo6ffa01d2007-03-02 17:32:47 +0900164#ifdef CONFIG_PM
Tejun Heo500530f2006-07-03 16:07:27 +0900165static void ata_eh_handle_port_suspend(struct ata_port *ap);
166static void ata_eh_handle_port_resume(struct ata_port *ap);
Tejun Heo6ffa01d2007-03-02 17:32:47 +0900167#else /* CONFIG_PM */
168static void ata_eh_handle_port_suspend(struct ata_port *ap)
169{ }
170
171static void ata_eh_handle_port_resume(struct ata_port *ap)
172{ }
Tejun Heo6ffa01d2007-03-02 17:32:47 +0900173#endif /* CONFIG_PM */
Tejun Heoad9e2762006-05-15 20:58:12 +0900174
Tejun Heob64bbc32007-07-16 14:29:39 +0900175static void __ata_ehi_pushv_desc(struct ata_eh_info *ehi, const char *fmt,
176 va_list args)
177{
178 ehi->desc_len += vscnprintf(ehi->desc + ehi->desc_len,
179 ATA_EH_DESC_LEN - ehi->desc_len,
180 fmt, args);
181}
182
183/**
184 * __ata_ehi_push_desc - push error description without adding separator
185 * @ehi: target EHI
186 * @fmt: printf format string
187 *
188 * Format string according to @fmt and append it to @ehi->desc.
189 *
190 * LOCKING:
191 * spin_lock_irqsave(host lock)
192 */
193void __ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...)
194{
195 va_list args;
196
197 va_start(args, fmt);
198 __ata_ehi_pushv_desc(ehi, fmt, args);
199 va_end(args);
200}
201
202/**
203 * ata_ehi_push_desc - push error description with separator
204 * @ehi: target EHI
205 * @fmt: printf format string
206 *
207 * Format string according to @fmt and append it to @ehi->desc.
208 * If @ehi->desc is not empty, ", " is added in-between.
209 *
210 * LOCKING:
211 * spin_lock_irqsave(host lock)
212 */
213void ata_ehi_push_desc(struct ata_eh_info *ehi, const char *fmt, ...)
214{
215 va_list args;
216
217 if (ehi->desc_len)
218 __ata_ehi_push_desc(ehi, ", ");
219
220 va_start(args, fmt);
221 __ata_ehi_pushv_desc(ehi, fmt, args);
222 va_end(args);
223}
224
225/**
226 * ata_ehi_clear_desc - clean error description
227 * @ehi: target EHI
228 *
229 * Clear @ehi->desc.
230 *
231 * LOCKING:
232 * spin_lock_irqsave(host lock)
233 */
234void ata_ehi_clear_desc(struct ata_eh_info *ehi)
235{
236 ehi->desc[0] = '\0';
237 ehi->desc_len = 0;
238}
239
Tejun Heocbcdd872007-08-18 13:14:55 +0900240/**
241 * ata_port_desc - append port description
242 * @ap: target ATA port
243 * @fmt: printf format string
244 *
245 * Format string according to @fmt and append it to port
246 * description. If port description is not empty, " " is added
247 * in-between. This function is to be used while initializing
248 * ata_host. The description is printed on host registration.
249 *
250 * LOCKING:
251 * None.
252 */
253void ata_port_desc(struct ata_port *ap, const char *fmt, ...)
254{
255 va_list args;
256
257 WARN_ON(!(ap->pflags & ATA_PFLAG_INITIALIZING));
258
259 if (ap->link.eh_info.desc_len)
260 __ata_ehi_push_desc(&ap->link.eh_info, " ");
261
262 va_start(args, fmt);
263 __ata_ehi_pushv_desc(&ap->link.eh_info, fmt, args);
264 va_end(args);
265}
266
267#ifdef CONFIG_PCI
268
269/**
270 * ata_port_pbar_desc - append PCI BAR description
271 * @ap: target ATA port
272 * @bar: target PCI BAR
273 * @offset: offset into PCI BAR
274 * @name: name of the area
275 *
276 * If @offset is negative, this function formats a string which
277 * contains the name, address, size and type of the BAR and
278 * appends it to the port description. If @offset is zero or
279 * positive, only name and offsetted address is appended.
280 *
281 * LOCKING:
282 * None.
283 */
284void ata_port_pbar_desc(struct ata_port *ap, int bar, ssize_t offset,
285 const char *name)
286{
287 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
288 char *type = "";
289 unsigned long long start, len;
290
291 if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM)
292 type = "m";
293 else if (pci_resource_flags(pdev, bar) & IORESOURCE_IO)
294 type = "i";
295
296 start = (unsigned long long)pci_resource_start(pdev, bar);
297 len = (unsigned long long)pci_resource_len(pdev, bar);
298
299 if (offset < 0)
300 ata_port_desc(ap, "%s %s%llu@0x%llx", name, type, len, start);
301 else
Andrew Mortone6a73ab2007-12-13 16:01:37 -0800302 ata_port_desc(ap, "%s 0x%llx", name,
303 start + (unsigned long long)offset);
Tejun Heocbcdd872007-08-18 13:14:55 +0900304}
305
306#endif /* CONFIG_PCI */
307
Tejun Heo87fbc5a2008-05-20 02:17:54 +0900308static int ata_lookup_timeout_table(u8 cmd)
309{
310 int i;
311
312 for (i = 0; i < ATA_EH_CMD_TIMEOUT_TABLE_SIZE; i++) {
313 const u8 *cur;
314
315 for (cur = ata_eh_cmd_timeout_table[i].commands; *cur; cur++)
316 if (*cur == cmd)
317 return i;
318 }
319
320 return -1;
321}
322
323/**
324 * ata_internal_cmd_timeout - determine timeout for an internal command
325 * @dev: target device
326 * @cmd: internal command to be issued
327 *
328 * Determine timeout for internal command @cmd for @dev.
329 *
330 * LOCKING:
331 * EH context.
332 *
333 * RETURNS:
334 * Determined timeout.
335 */
336unsigned long ata_internal_cmd_timeout(struct ata_device *dev, u8 cmd)
337{
338 struct ata_eh_context *ehc = &dev->link->eh_context;
339 int ent = ata_lookup_timeout_table(cmd);
340 int idx;
341
342 if (ent < 0)
343 return ATA_EH_CMD_DFL_TIMEOUT;
344
345 idx = ehc->cmd_timeout_idx[dev->devno][ent];
346 return ata_eh_cmd_timeout_table[ent].timeouts[idx];
347}
348
349/**
350 * ata_internal_cmd_timed_out - notification for internal command timeout
351 * @dev: target device
352 * @cmd: internal command which timed out
353 *
354 * Notify EH that internal command @cmd for @dev timed out. This
355 * function should be called only for commands whose timeouts are
356 * determined using ata_internal_cmd_timeout().
357 *
358 * LOCKING:
359 * EH context.
360 */
361void ata_internal_cmd_timed_out(struct ata_device *dev, u8 cmd)
362{
363 struct ata_eh_context *ehc = &dev->link->eh_context;
364 int ent = ata_lookup_timeout_table(cmd);
365 int idx;
366
367 if (ent < 0)
368 return;
369
370 idx = ehc->cmd_timeout_idx[dev->devno][ent];
371 if (ata_eh_cmd_timeout_table[ent].timeouts[idx + 1] != ULONG_MAX)
372 ehc->cmd_timeout_idx[dev->devno][ent]++;
373}
374
Tejun Heo3884f7b2007-11-27 19:28:56 +0900375static void ata_ering_record(struct ata_ering *ering, unsigned int eflags,
Tejun Heo0c247c52006-05-15 20:58:19 +0900376 unsigned int err_mask)
377{
378 struct ata_ering_entry *ent;
379
380 WARN_ON(!err_mask);
381
382 ering->cursor++;
383 ering->cursor %= ATA_ERING_SIZE;
384
385 ent = &ering->ring[ering->cursor];
Tejun Heo3884f7b2007-11-27 19:28:56 +0900386 ent->eflags = eflags;
Tejun Heo0c247c52006-05-15 20:58:19 +0900387 ent->err_mask = err_mask;
388 ent->timestamp = get_jiffies_64();
389}
390
Tejun Heo76326ac2007-11-27 19:28:59 +0900391static struct ata_ering_entry *ata_ering_top(struct ata_ering *ering)
392{
393 struct ata_ering_entry *ent = &ering->ring[ering->cursor];
394
395 if (ent->err_mask)
396 return ent;
397 return NULL;
398}
399
Gwendal Grignoud9027472010-05-25 12:31:38 -0700400int ata_ering_map(struct ata_ering *ering,
401 int (*map_fn)(struct ata_ering_entry *, void *),
402 void *arg)
Tejun Heo0c247c52006-05-15 20:58:19 +0900403{
404 int idx, rc = 0;
405 struct ata_ering_entry *ent;
406
407 idx = ering->cursor;
408 do {
409 ent = &ering->ring[idx];
410 if (!ent->err_mask)
411 break;
412 rc = map_fn(ent, arg);
413 if (rc)
414 break;
415 idx = (idx - 1 + ATA_ERING_SIZE) % ATA_ERING_SIZE;
416 } while (idx != ering->cursor);
417
418 return rc;
419}
420
Gwendal Grignoud9027472010-05-25 12:31:38 -0700421int ata_ering_clear_cb(struct ata_ering_entry *ent, void *void_arg)
422{
423 ent->eflags |= ATA_EFLAG_OLD_ER;
424 return 0;
425}
426
427static void ata_ering_clear(struct ata_ering *ering)
428{
429 ata_ering_map(ering, ata_ering_clear_cb, NULL);
430}
431
Tejun Heo64f65ca2006-06-24 20:30:18 +0900432static unsigned int ata_eh_dev_action(struct ata_device *dev)
433{
Tejun Heo9af5c9c2007-08-06 18:36:22 +0900434 struct ata_eh_context *ehc = &dev->link->eh_context;
Tejun Heo64f65ca2006-06-24 20:30:18 +0900435
436 return ehc->i.action | ehc->i.dev_action[dev->devno];
437}
438
Tejun Heof58229f2007-08-06 18:36:23 +0900439static void ata_eh_clear_action(struct ata_link *link, struct ata_device *dev,
Tejun Heoaf181c22006-06-24 20:30:18 +0900440 struct ata_eh_info *ehi, unsigned int action)
441{
Tejun Heof58229f2007-08-06 18:36:23 +0900442 struct ata_device *tdev;
Tejun Heoaf181c22006-06-24 20:30:18 +0900443
444 if (!dev) {
445 ehi->action &= ~action;
Tejun Heo1eca4362008-11-03 20:03:17 +0900446 ata_for_each_dev(tdev, link, ALL)
Tejun Heof58229f2007-08-06 18:36:23 +0900447 ehi->dev_action[tdev->devno] &= ~action;
Tejun Heoaf181c22006-06-24 20:30:18 +0900448 } else {
449 /* doesn't make sense for port-wide EH actions */
450 WARN_ON(!(action & ATA_EH_PERDEV_MASK));
451
452 /* break ehi->action into ehi->dev_action */
453 if (ehi->action & action) {
Tejun Heo1eca4362008-11-03 20:03:17 +0900454 ata_for_each_dev(tdev, link, ALL)
Tejun Heof58229f2007-08-06 18:36:23 +0900455 ehi->dev_action[tdev->devno] |=
456 ehi->action & action;
Tejun Heoaf181c22006-06-24 20:30:18 +0900457 ehi->action &= ~action;
458 }
459
460 /* turn off the specified per-dev action */
461 ehi->dev_action[dev->devno] &= ~action;
462 }
463}
464
Tejun Heoece1d632006-04-02 18:51:53 +0900465/**
Tejun Heoc0c362b2010-09-06 17:57:14 +0200466 * ata_eh_acquire - acquire EH ownership
467 * @ap: ATA port to acquire EH ownership for
468 *
469 * Acquire EH ownership for @ap. This is the basic exclusion
470 * mechanism for ports sharing a host. Only one port hanging off
471 * the same host can claim the ownership of EH.
472 *
473 * LOCKING:
474 * EH context.
475 */
476void ata_eh_acquire(struct ata_port *ap)
477{
478 mutex_lock(&ap->host->eh_mutex);
479 WARN_ON_ONCE(ap->host->eh_owner);
480 ap->host->eh_owner = current;
481}
482
483/**
484 * ata_eh_release - release EH ownership
485 * @ap: ATA port to release EH ownership for
486 *
487 * Release EH ownership for @ap if the caller. The caller must
488 * have acquired EH ownership using ata_eh_acquire() previously.
489 *
490 * LOCKING:
491 * EH context.
492 */
493void ata_eh_release(struct ata_port *ap)
494{
495 WARN_ON_ONCE(ap->host->eh_owner != current);
496 ap->host->eh_owner = NULL;
497 mutex_unlock(&ap->host->eh_mutex);
498}
499
500/**
Tejun Heoece1d632006-04-02 18:51:53 +0900501 * ata_scsi_timed_out - SCSI layer time out callback
502 * @cmd: timed out SCSI command
503 *
504 * Handles SCSI layer timeout. We race with normal completion of
505 * the qc for @cmd. If the qc is already gone, we lose and let
506 * the scsi command finish (EH_HANDLED). Otherwise, the qc has
507 * timed out and EH should be invoked. Prevent ata_qc_complete()
508 * from finishing it by setting EH_SCHEDULED and return
509 * EH_NOT_HANDLED.
510 *
Tejun Heoad9e2762006-05-15 20:58:12 +0900511 * TODO: kill this function once old EH is gone.
512 *
Tejun Heoece1d632006-04-02 18:51:53 +0900513 * LOCKING:
514 * Called from timer context
515 *
516 * RETURNS:
517 * EH_HANDLED or EH_NOT_HANDLED
518 */
Jens Axboe242f9dc2008-09-14 05:55:09 -0700519enum blk_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd)
Tejun Heoece1d632006-04-02 18:51:53 +0900520{
521 struct Scsi_Host *host = cmd->device->host;
Jeff Garzik35bb94b2006-04-11 13:12:34 -0400522 struct ata_port *ap = ata_shost_to_port(host);
Tejun Heoece1d632006-04-02 18:51:53 +0900523 unsigned long flags;
524 struct ata_queued_cmd *qc;
Jens Axboe242f9dc2008-09-14 05:55:09 -0700525 enum blk_eh_timer_return ret;
Tejun Heoece1d632006-04-02 18:51:53 +0900526
527 DPRINTK("ENTER\n");
528
Tejun Heoad9e2762006-05-15 20:58:12 +0900529 if (ap->ops->error_handler) {
Jens Axboe242f9dc2008-09-14 05:55:09 -0700530 ret = BLK_EH_NOT_HANDLED;
Tejun Heoad9e2762006-05-15 20:58:12 +0900531 goto out;
532 }
533
Jens Axboe242f9dc2008-09-14 05:55:09 -0700534 ret = BLK_EH_HANDLED;
Jeff Garzikba6a1302006-06-22 23:46:10 -0400535 spin_lock_irqsave(ap->lock, flags);
Tejun Heo9af5c9c2007-08-06 18:36:22 +0900536 qc = ata_qc_from_tag(ap, ap->link.active_tag);
Tejun Heoece1d632006-04-02 18:51:53 +0900537 if (qc) {
538 WARN_ON(qc->scsicmd != cmd);
539 qc->flags |= ATA_QCFLAG_EH_SCHEDULED;
540 qc->err_mask |= AC_ERR_TIMEOUT;
Jens Axboe242f9dc2008-09-14 05:55:09 -0700541 ret = BLK_EH_NOT_HANDLED;
Tejun Heoece1d632006-04-02 18:51:53 +0900542 }
Jeff Garzikba6a1302006-06-22 23:46:10 -0400543 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoece1d632006-04-02 18:51:53 +0900544
Tejun Heoad9e2762006-05-15 20:58:12 +0900545 out:
Tejun Heoece1d632006-04-02 18:51:53 +0900546 DPRINTK("EXIT, ret=%d\n", ret);
547 return ret;
548}
549
Tejun Heoece180d2008-11-03 20:04:37 +0900550static void ata_eh_unload(struct ata_port *ap)
551{
552 struct ata_link *link;
553 struct ata_device *dev;
554 unsigned long flags;
555
556 /* Restore SControl IPM and SPD for the next driver and
557 * disable attached devices.
558 */
559 ata_for_each_link(link, ap, PMP_FIRST) {
560 sata_scr_write(link, SCR_CONTROL, link->saved_scontrol & 0xff0);
561 ata_for_each_dev(dev, link, ALL)
562 ata_dev_disable(dev);
563 }
564
565 /* freeze and set UNLOADED */
566 spin_lock_irqsave(ap->lock, flags);
567
568 ata_port_freeze(ap); /* won't be thawed */
569 ap->pflags &= ~ATA_PFLAG_EH_PENDING; /* clear pending from freeze */
570 ap->pflags |= ATA_PFLAG_UNLOADED;
571
572 spin_unlock_irqrestore(ap->lock, flags);
573}
574
Tejun Heoece1d632006-04-02 18:51:53 +0900575/**
576 * ata_scsi_error - SCSI layer error handler callback
577 * @host: SCSI host on which error occurred
578 *
579 * Handles SCSI-layer-thrown error events.
580 *
581 * LOCKING:
582 * Inherited from SCSI layer (none, can sleep)
583 *
584 * RETURNS:
585 * Zero.
586 */
Jeff Garzik381544b2006-04-11 13:04:39 -0400587void ata_scsi_error(struct Scsi_Host *host)
Tejun Heoece1d632006-04-02 18:51:53 +0900588{
Jeff Garzik35bb94b2006-04-11 13:12:34 -0400589 struct ata_port *ap = ata_shost_to_port(host);
Tejun Heoa1e10f72007-08-18 13:28:49 +0900590 int i;
Tejun Heoad9e2762006-05-15 20:58:12 +0900591 unsigned long flags;
Tejun Heoece1d632006-04-02 18:51:53 +0900592
593 DPRINTK("ENTER\n");
594
Tejun Heoc4291372010-05-10 21:41:38 +0200595 /* make sure sff pio task is not running */
596 ata_sff_flush_pio_task(ap);
Tejun Heoece1d632006-04-02 18:51:53 +0900597
Jeff Garzikcca39742006-08-24 03:19:22 -0400598 /* synchronize with host lock and sort out timeouts */
Tejun Heoece1d632006-04-02 18:51:53 +0900599
Tejun Heoad9e2762006-05-15 20:58:12 +0900600 /* For new EH, all qcs are finished in one of three ways -
601 * normal completion, error completion, and SCSI timeout.
Alan Coxc96f1732009-03-24 10:23:46 +0000602 * Both completions can race against SCSI timeout. When normal
Tejun Heoad9e2762006-05-15 20:58:12 +0900603 * completion wins, the qc never reaches EH. When error
604 * completion wins, the qc has ATA_QCFLAG_FAILED set.
605 *
606 * When SCSI timeout wins, things are a bit more complex.
607 * Normal or error completion can occur after the timeout but
608 * before this point. In such cases, both types of
609 * completions are honored. A scmd is determined to have
610 * timed out iff its associated qc is active and not failed.
611 */
612 if (ap->ops->error_handler) {
613 struct scsi_cmnd *scmd, *tmp;
614 int nr_timedout = 0;
Tejun Heoece1d632006-04-02 18:51:53 +0900615
Tejun Heoe30349d2006-07-03 03:02:15 +0900616 spin_lock_irqsave(ap->lock, flags);
Gwendal Grignoud9027472010-05-25 12:31:38 -0700617
Alan Coxc96f1732009-03-24 10:23:46 +0000618 /* This must occur under the ap->lock as we don't want
619 a polled recovery to race the real interrupt handler
Gwendal Grignoud9027472010-05-25 12:31:38 -0700620
Alan Coxc96f1732009-03-24 10:23:46 +0000621 The lost_interrupt handler checks for any completed but
622 non-notified command and completes much like an IRQ handler.
Gwendal Grignoud9027472010-05-25 12:31:38 -0700623
Alan Coxc96f1732009-03-24 10:23:46 +0000624 We then fall into the error recovery code which will treat
625 this as if normal completion won the race */
Tejun Heoad9e2762006-05-15 20:58:12 +0900626
Alan Coxc96f1732009-03-24 10:23:46 +0000627 if (ap->ops->lost_interrupt)
628 ap->ops->lost_interrupt(ap);
Gwendal Grignoud9027472010-05-25 12:31:38 -0700629
Tejun Heoad9e2762006-05-15 20:58:12 +0900630 list_for_each_entry_safe(scmd, tmp, &host->eh_cmd_q, eh_entry) {
631 struct ata_queued_cmd *qc;
632
633 for (i = 0; i < ATA_MAX_QUEUE; i++) {
634 qc = __ata_qc_from_tag(ap, i);
635 if (qc->flags & ATA_QCFLAG_ACTIVE &&
636 qc->scsicmd == scmd)
637 break;
638 }
639
640 if (i < ATA_MAX_QUEUE) {
641 /* the scmd has an associated qc */
642 if (!(qc->flags & ATA_QCFLAG_FAILED)) {
643 /* which hasn't failed yet, timeout */
644 qc->err_mask |= AC_ERR_TIMEOUT;
645 qc->flags |= ATA_QCFLAG_FAILED;
646 nr_timedout++;
647 }
648 } else {
649 /* Normal completion occurred after
650 * SCSI timeout but before this point.
651 * Successfully complete it.
652 */
653 scmd->retries = scmd->allowed;
654 scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
655 }
656 }
657
658 /* If we have timed out qcs. They belong to EH from
659 * this point but the state of the controller is
660 * unknown. Freeze the port to make sure the IRQ
661 * handler doesn't diddle with those qcs. This must
662 * be done atomically w.r.t. setting QCFLAG_FAILED.
663 */
664 if (nr_timedout)
665 __ata_port_freeze(ap);
666
Tejun Heoe30349d2006-07-03 03:02:15 +0900667 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoa1e10f72007-08-18 13:28:49 +0900668
669 /* initialize eh_tries */
670 ap->eh_tries = ATA_EH_MAX_TRIES;
Tejun Heoad9e2762006-05-15 20:58:12 +0900671 } else
Tejun Heoe30349d2006-07-03 03:02:15 +0900672 spin_unlock_wait(ap->lock);
Gwendal Grignoud9027472010-05-25 12:31:38 -0700673
Alan Coxc96f1732009-03-24 10:23:46 +0000674 /* If we timed raced normal completion and there is nothing to
675 recover nr_timedout == 0 why exactly are we doing error recovery ? */
Tejun Heoad9e2762006-05-15 20:58:12 +0900676
Tejun Heoad9e2762006-05-15 20:58:12 +0900677 /* invoke error handler */
678 if (ap->ops->error_handler) {
Tejun Heocf1b86c2007-08-06 18:36:23 +0900679 struct ata_link *link;
680
Tejun Heoc0c362b2010-09-06 17:57:14 +0200681 /* acquire EH ownership */
682 ata_eh_acquire(ap);
683 repeat:
Tejun Heo5ddf24c2007-07-16 14:29:41 +0900684 /* kill fast drain timer */
685 del_timer_sync(&ap->fastdrain_timer);
686
Tejun Heo500530f2006-07-03 16:07:27 +0900687 /* process port resume request */
688 ata_eh_handle_port_resume(ap);
689
Tejun Heof3e81b12006-05-15 20:58:21 +0900690 /* fetch & clear EH info */
Tejun Heoe30349d2006-07-03 03:02:15 +0900691 spin_lock_irqsave(ap->lock, flags);
Tejun Heof3e81b12006-05-15 20:58:21 +0900692
Tejun Heo1eca4362008-11-03 20:03:17 +0900693 ata_for_each_link(link, ap, HOST_FIRST) {
Tejun Heo00115e02007-11-27 19:28:58 +0900694 struct ata_eh_context *ehc = &link->eh_context;
695 struct ata_device *dev;
696
Tejun Heocf1b86c2007-08-06 18:36:23 +0900697 memset(&link->eh_context, 0, sizeof(link->eh_context));
698 link->eh_context.i = link->eh_info;
699 memset(&link->eh_info, 0, sizeof(link->eh_info));
Tejun Heo00115e02007-11-27 19:28:58 +0900700
Tejun Heo1eca4362008-11-03 20:03:17 +0900701 ata_for_each_dev(dev, link, ENABLED) {
Tejun Heo00115e02007-11-27 19:28:58 +0900702 int devno = dev->devno;
703
704 ehc->saved_xfer_mode[devno] = dev->xfer_mode;
705 if (ata_ncq_enabled(dev))
706 ehc->saved_ncq_enabled |= 1 << devno;
707 }
Tejun Heocf1b86c2007-08-06 18:36:23 +0900708 }
Tejun Heof3e81b12006-05-15 20:58:21 +0900709
Tejun Heob51e9e52006-06-29 01:29:30 +0900710 ap->pflags |= ATA_PFLAG_EH_IN_PROGRESS;
711 ap->pflags &= ~ATA_PFLAG_EH_PENDING;
Tejun Heoda917d62007-09-23 13:14:12 +0900712 ap->excl_link = NULL; /* don't maintain exclusion over EH */
Tejun Heof3e81b12006-05-15 20:58:21 +0900713
Tejun Heoe30349d2006-07-03 03:02:15 +0900714 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoad9e2762006-05-15 20:58:12 +0900715
Tejun Heo500530f2006-07-03 16:07:27 +0900716 /* invoke EH, skip if unloading or suspended */
717 if (!(ap->pflags & (ATA_PFLAG_UNLOADING | ATA_PFLAG_SUSPENDED)))
Tejun Heo720ba122006-05-31 18:28:13 +0900718 ap->ops->error_handler(ap);
Tejun Heoece180d2008-11-03 20:04:37 +0900719 else {
720 /* if unloading, commence suicide */
721 if ((ap->pflags & ATA_PFLAG_UNLOADING) &&
722 !(ap->pflags & ATA_PFLAG_UNLOADED))
723 ata_eh_unload(ap);
Tejun Heo720ba122006-05-31 18:28:13 +0900724 ata_eh_finish(ap);
Tejun Heoece180d2008-11-03 20:04:37 +0900725 }
Tejun Heoad9e2762006-05-15 20:58:12 +0900726
Tejun Heo500530f2006-07-03 16:07:27 +0900727 /* process port suspend request */
728 ata_eh_handle_port_suspend(ap);
729
Tejun Heoad9e2762006-05-15 20:58:12 +0900730 /* Exception might have happend after ->error_handler
731 * recovered the port but before this point. Repeat
732 * EH in such case.
733 */
Tejun Heoe30349d2006-07-03 03:02:15 +0900734 spin_lock_irqsave(ap->lock, flags);
Tejun Heoad9e2762006-05-15 20:58:12 +0900735
Tejun Heob51e9e52006-06-29 01:29:30 +0900736 if (ap->pflags & ATA_PFLAG_EH_PENDING) {
Tejun Heoa1e10f72007-08-18 13:28:49 +0900737 if (--ap->eh_tries) {
Tejun Heoe30349d2006-07-03 03:02:15 +0900738 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoad9e2762006-05-15 20:58:12 +0900739 goto repeat;
740 }
741 ata_port_printk(ap, KERN_ERR, "EH pending after %d "
Tejun Heoa1e10f72007-08-18 13:28:49 +0900742 "tries, giving up\n", ATA_EH_MAX_TRIES);
Tejun Heo914616a2007-06-25 21:47:11 +0900743 ap->pflags &= ~ATA_PFLAG_EH_PENDING;
Tejun Heoad9e2762006-05-15 20:58:12 +0900744 }
745
Tejun Heof3e81b12006-05-15 20:58:21 +0900746 /* this run is complete, make sure EH info is clear */
Tejun Heo1eca4362008-11-03 20:03:17 +0900747 ata_for_each_link(link, ap, HOST_FIRST)
Tejun Heocf1b86c2007-08-06 18:36:23 +0900748 memset(&link->eh_info, 0, sizeof(link->eh_info));
Tejun Heof3e81b12006-05-15 20:58:21 +0900749
Tejun Heoe30349d2006-07-03 03:02:15 +0900750 /* Clear host_eh_scheduled while holding ap->lock such
Tejun Heoad9e2762006-05-15 20:58:12 +0900751 * that if exception occurs after this point but
752 * before EH completion, SCSI midlayer will
753 * re-initiate EH.
754 */
755 host->host_eh_scheduled = 0;
756
Tejun Heoe30349d2006-07-03 03:02:15 +0900757 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoc0c362b2010-09-06 17:57:14 +0200758 ata_eh_release(ap);
Tejun Heoad9e2762006-05-15 20:58:12 +0900759 } else {
Tejun Heo9af5c9c2007-08-06 18:36:22 +0900760 WARN_ON(ata_qc_from_tag(ap, ap->link.active_tag) == NULL);
Tejun Heoad9e2762006-05-15 20:58:12 +0900761 ap->ops->eng_timeout(ap);
762 }
763
764 /* finish or retry handled scmd's and clean up */
Tejun Heoece1d632006-04-02 18:51:53 +0900765 WARN_ON(host->host_failed || !list_empty(&host->eh_cmd_q));
766
767 scsi_eh_flush_done_q(&ap->eh_done_q);
768
Tejun Heoad9e2762006-05-15 20:58:12 +0900769 /* clean up */
Tejun Heoe30349d2006-07-03 03:02:15 +0900770 spin_lock_irqsave(ap->lock, flags);
Tejun Heoad9e2762006-05-15 20:58:12 +0900771
Tejun Heo1cdaf532006-07-03 16:07:26 +0900772 if (ap->pflags & ATA_PFLAG_LOADING)
Tejun Heob51e9e52006-06-29 01:29:30 +0900773 ap->pflags &= ~ATA_PFLAG_LOADING;
Tejun Heo1cdaf532006-07-03 16:07:26 +0900774 else if (ap->pflags & ATA_PFLAG_SCSI_HOTPLUG)
Tejun Heoad72cf92010-07-02 10:03:52 +0200775 schedule_delayed_work(&ap->hotplug_task, 0);
Tejun Heo1cdaf532006-07-03 16:07:26 +0900776
777 if (ap->pflags & ATA_PFLAG_RECOVERED)
778 ata_port_printk(ap, KERN_INFO, "EH complete\n");
Tejun Heo580b21022006-05-31 18:28:05 +0900779
Tejun Heob51e9e52006-06-29 01:29:30 +0900780 ap->pflags &= ~(ATA_PFLAG_SCSI_HOTPLUG | ATA_PFLAG_RECOVERED);
Tejun Heoad9e2762006-05-15 20:58:12 +0900781
Tejun Heoc6cf9e92006-05-31 18:27:27 +0900782 /* tell wait_eh that we're done */
Tejun Heob51e9e52006-06-29 01:29:30 +0900783 ap->pflags &= ~ATA_PFLAG_EH_IN_PROGRESS;
Tejun Heoc6cf9e92006-05-31 18:27:27 +0900784 wake_up_all(&ap->eh_wait_q);
785
Tejun Heoe30349d2006-07-03 03:02:15 +0900786 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoad9e2762006-05-15 20:58:12 +0900787
Tejun Heoece1d632006-04-02 18:51:53 +0900788 DPRINTK("EXIT\n");
Tejun Heoece1d632006-04-02 18:51:53 +0900789}
790
791/**
Tejun Heoc6cf9e92006-05-31 18:27:27 +0900792 * ata_port_wait_eh - Wait for the currently pending EH to complete
793 * @ap: Port to wait EH for
794 *
795 * Wait until the currently pending EH is complete.
796 *
797 * LOCKING:
798 * Kernel thread context (may sleep).
799 */
800void ata_port_wait_eh(struct ata_port *ap)
801{
802 unsigned long flags;
803 DEFINE_WAIT(wait);
804
805 retry:
Jeff Garzikba6a1302006-06-22 23:46:10 -0400806 spin_lock_irqsave(ap->lock, flags);
Tejun Heoc6cf9e92006-05-31 18:27:27 +0900807
Tejun Heob51e9e52006-06-29 01:29:30 +0900808 while (ap->pflags & (ATA_PFLAG_EH_PENDING | ATA_PFLAG_EH_IN_PROGRESS)) {
Tejun Heoc6cf9e92006-05-31 18:27:27 +0900809 prepare_to_wait(&ap->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
Jeff Garzikba6a1302006-06-22 23:46:10 -0400810 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoc6cf9e92006-05-31 18:27:27 +0900811 schedule();
Jeff Garzikba6a1302006-06-22 23:46:10 -0400812 spin_lock_irqsave(ap->lock, flags);
Tejun Heoc6cf9e92006-05-31 18:27:27 +0900813 }
Tejun Heo0a1b6222006-06-11 11:01:38 +0900814 finish_wait(&ap->eh_wait_q, &wait);
Tejun Heoc6cf9e92006-05-31 18:27:27 +0900815
Jeff Garzikba6a1302006-06-22 23:46:10 -0400816 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoc6cf9e92006-05-31 18:27:27 +0900817
818 /* make sure SCSI EH is complete */
Jeff Garzikcca39742006-08-24 03:19:22 -0400819 if (scsi_host_in_recovery(ap->scsi_host)) {
Tejun Heo97750ce2010-09-06 17:56:29 +0200820 ata_msleep(ap, 10);
Tejun Heoc6cf9e92006-05-31 18:27:27 +0900821 goto retry;
822 }
823}
824
Tejun Heo5ddf24c2007-07-16 14:29:41 +0900825static int ata_eh_nr_in_flight(struct ata_port *ap)
826{
827 unsigned int tag;
828 int nr = 0;
829
830 /* count only non-internal commands */
831 for (tag = 0; tag < ATA_MAX_QUEUE - 1; tag++)
832 if (ata_qc_from_tag(ap, tag))
833 nr++;
834
835 return nr;
836}
837
838void ata_eh_fastdrain_timerfn(unsigned long arg)
839{
840 struct ata_port *ap = (void *)arg;
841 unsigned long flags;
842 int cnt;
843
844 spin_lock_irqsave(ap->lock, flags);
845
846 cnt = ata_eh_nr_in_flight(ap);
847
848 /* are we done? */
849 if (!cnt)
850 goto out_unlock;
851
852 if (cnt == ap->fastdrain_cnt) {
853 unsigned int tag;
854
855 /* No progress during the last interval, tag all
856 * in-flight qcs as timed out and freeze the port.
857 */
858 for (tag = 0; tag < ATA_MAX_QUEUE - 1; tag++) {
859 struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag);
860 if (qc)
861 qc->err_mask |= AC_ERR_TIMEOUT;
862 }
863
864 ata_port_freeze(ap);
865 } else {
866 /* some qcs have finished, give it another chance */
867 ap->fastdrain_cnt = cnt;
868 ap->fastdrain_timer.expires =
Tejun Heo341c2c92008-05-20 02:17:51 +0900869 ata_deadline(jiffies, ATA_EH_FASTDRAIN_INTERVAL);
Tejun Heo5ddf24c2007-07-16 14:29:41 +0900870 add_timer(&ap->fastdrain_timer);
871 }
872
873 out_unlock:
874 spin_unlock_irqrestore(ap->lock, flags);
875}
876
877/**
878 * ata_eh_set_pending - set ATA_PFLAG_EH_PENDING and activate fast drain
879 * @ap: target ATA port
880 * @fastdrain: activate fast drain
881 *
882 * Set ATA_PFLAG_EH_PENDING and activate fast drain if @fastdrain
883 * is non-zero and EH wasn't pending before. Fast drain ensures
884 * that EH kicks in in timely manner.
885 *
886 * LOCKING:
887 * spin_lock_irqsave(host lock)
888 */
889static void ata_eh_set_pending(struct ata_port *ap, int fastdrain)
890{
891 int cnt;
892
893 /* already scheduled? */
894 if (ap->pflags & ATA_PFLAG_EH_PENDING)
895 return;
896
897 ap->pflags |= ATA_PFLAG_EH_PENDING;
898
899 if (!fastdrain)
900 return;
901
902 /* do we have in-flight qcs? */
903 cnt = ata_eh_nr_in_flight(ap);
904 if (!cnt)
905 return;
906
907 /* activate fast drain */
908 ap->fastdrain_cnt = cnt;
Tejun Heo341c2c92008-05-20 02:17:51 +0900909 ap->fastdrain_timer.expires =
910 ata_deadline(jiffies, ATA_EH_FASTDRAIN_INTERVAL);
Tejun Heo5ddf24c2007-07-16 14:29:41 +0900911 add_timer(&ap->fastdrain_timer);
912}
913
Tejun Heof686bcb2006-05-15 20:58:05 +0900914/**
915 * ata_qc_schedule_eh - schedule qc for error handling
916 * @qc: command to schedule error handling for
917 *
918 * Schedule error handling for @qc. EH will kick in as soon as
919 * other commands are drained.
920 *
921 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -0400922 * spin_lock_irqsave(host lock)
Tejun Heof686bcb2006-05-15 20:58:05 +0900923 */
924void ata_qc_schedule_eh(struct ata_queued_cmd *qc)
925{
926 struct ata_port *ap = qc->ap;
Tejun Heofa41efd2010-04-15 08:57:37 +0900927 struct request_queue *q = qc->scsicmd->device->request_queue;
928 unsigned long flags;
Tejun Heof686bcb2006-05-15 20:58:05 +0900929
930 WARN_ON(!ap->ops->error_handler);
931
932 qc->flags |= ATA_QCFLAG_FAILED;
Tejun Heo5ddf24c2007-07-16 14:29:41 +0900933 ata_eh_set_pending(ap, 1);
Tejun Heof686bcb2006-05-15 20:58:05 +0900934
935 /* The following will fail if timeout has already expired.
936 * ata_scsi_error() takes care of such scmds on EH entry.
937 * Note that ATA_QCFLAG_FAILED is unconditionally set after
938 * this function completes.
939 */
Tejun Heofa41efd2010-04-15 08:57:37 +0900940 spin_lock_irqsave(q->queue_lock, flags);
Jens Axboe242f9dc2008-09-14 05:55:09 -0700941 blk_abort_request(qc->scsicmd->request);
Tejun Heofa41efd2010-04-15 08:57:37 +0900942 spin_unlock_irqrestore(q->queue_lock, flags);
Tejun Heof686bcb2006-05-15 20:58:05 +0900943}
944
Tejun Heo7b70fc02006-05-15 20:58:07 +0900945/**
946 * ata_port_schedule_eh - schedule error handling without a qc
947 * @ap: ATA port to schedule EH for
948 *
949 * Schedule error handling for @ap. EH will kick in as soon as
950 * all commands are drained.
951 *
952 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -0400953 * spin_lock_irqsave(host lock)
Tejun Heo7b70fc02006-05-15 20:58:07 +0900954 */
955void ata_port_schedule_eh(struct ata_port *ap)
956{
957 WARN_ON(!ap->ops->error_handler);
958
Tejun Heof4d6d002007-05-01 11:50:15 +0200959 if (ap->pflags & ATA_PFLAG_INITIALIZING)
960 return;
961
Tejun Heo5ddf24c2007-07-16 14:29:41 +0900962 ata_eh_set_pending(ap, 1);
Jeff Garzikcca39742006-08-24 03:19:22 -0400963 scsi_schedule_eh(ap->scsi_host);
Tejun Heo7b70fc02006-05-15 20:58:07 +0900964
965 DPRINTK("port EH scheduled\n");
966}
967
Tejun Heodbd82612007-08-06 18:36:23 +0900968static int ata_do_link_abort(struct ata_port *ap, struct ata_link *link)
Tejun Heo7b70fc02006-05-15 20:58:07 +0900969{
970 int tag, nr_aborted = 0;
971
972 WARN_ON(!ap->ops->error_handler);
973
Tejun Heo5ddf24c2007-07-16 14:29:41 +0900974 /* we're gonna abort all commands, no need for fast drain */
975 ata_eh_set_pending(ap, 0);
976
Tejun Heo7b70fc02006-05-15 20:58:07 +0900977 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
978 struct ata_queued_cmd *qc = ata_qc_from_tag(ap, tag);
979
Tejun Heodbd82612007-08-06 18:36:23 +0900980 if (qc && (!link || qc->dev->link == link)) {
Tejun Heo7b70fc02006-05-15 20:58:07 +0900981 qc->flags |= ATA_QCFLAG_FAILED;
982 ata_qc_complete(qc);
983 nr_aborted++;
984 }
985 }
986
987 if (!nr_aborted)
988 ata_port_schedule_eh(ap);
989
990 return nr_aborted;
991}
992
Tejun Heoe3180492006-05-15 20:58:09 +0900993/**
Tejun Heodbd82612007-08-06 18:36:23 +0900994 * ata_link_abort - abort all qc's on the link
995 * @link: ATA link to abort qc's for
996 *
997 * Abort all active qc's active on @link and schedule EH.
998 *
999 * LOCKING:
1000 * spin_lock_irqsave(host lock)
1001 *
1002 * RETURNS:
1003 * Number of aborted qc's.
1004 */
1005int ata_link_abort(struct ata_link *link)
1006{
1007 return ata_do_link_abort(link->ap, link);
1008}
1009
1010/**
1011 * ata_port_abort - abort all qc's on the port
1012 * @ap: ATA port to abort qc's for
1013 *
1014 * Abort all active qc's of @ap and schedule EH.
1015 *
1016 * LOCKING:
1017 * spin_lock_irqsave(host_set lock)
1018 *
1019 * RETURNS:
1020 * Number of aborted qc's.
1021 */
1022int ata_port_abort(struct ata_port *ap)
1023{
1024 return ata_do_link_abort(ap, NULL);
1025}
1026
1027/**
Tejun Heoe3180492006-05-15 20:58:09 +09001028 * __ata_port_freeze - freeze port
1029 * @ap: ATA port to freeze
1030 *
1031 * This function is called when HSM violation or some other
1032 * condition disrupts normal operation of the port. Frozen port
1033 * is not allowed to perform any operation until the port is
1034 * thawed, which usually follows a successful reset.
1035 *
1036 * ap->ops->freeze() callback can be used for freezing the port
1037 * hardware-wise (e.g. mask interrupt and stop DMA engine). If a
1038 * port cannot be frozen hardware-wise, the interrupt handler
1039 * must ack and clear interrupts unconditionally while the port
1040 * is frozen.
1041 *
1042 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04001043 * spin_lock_irqsave(host lock)
Tejun Heoe3180492006-05-15 20:58:09 +09001044 */
1045static void __ata_port_freeze(struct ata_port *ap)
1046{
1047 WARN_ON(!ap->ops->error_handler);
1048
1049 if (ap->ops->freeze)
1050 ap->ops->freeze(ap);
1051
Tejun Heob51e9e52006-06-29 01:29:30 +09001052 ap->pflags |= ATA_PFLAG_FROZEN;
Tejun Heoe3180492006-05-15 20:58:09 +09001053
Tejun Heo44877b42007-02-21 01:06:51 +09001054 DPRINTK("ata%u port frozen\n", ap->print_id);
Tejun Heoe3180492006-05-15 20:58:09 +09001055}
1056
1057/**
1058 * ata_port_freeze - abort & freeze port
1059 * @ap: ATA port to freeze
1060 *
Jeff Garzik54c38442009-04-07 19:13:15 -04001061 * Abort and freeze @ap. The freeze operation must be called
1062 * first, because some hardware requires special operations
1063 * before the taskfile registers are accessible.
Tejun Heoe3180492006-05-15 20:58:09 +09001064 *
1065 * LOCKING:
Jeff Garzikcca39742006-08-24 03:19:22 -04001066 * spin_lock_irqsave(host lock)
Tejun Heoe3180492006-05-15 20:58:09 +09001067 *
1068 * RETURNS:
1069 * Number of aborted commands.
1070 */
1071int ata_port_freeze(struct ata_port *ap)
1072{
1073 int nr_aborted;
1074
1075 WARN_ON(!ap->ops->error_handler);
1076
Tejun Heoe3180492006-05-15 20:58:09 +09001077 __ata_port_freeze(ap);
Jeff Garzik54c38442009-04-07 19:13:15 -04001078 nr_aborted = ata_port_abort(ap);
Tejun Heoe3180492006-05-15 20:58:09 +09001079
1080 return nr_aborted;
1081}
1082
1083/**
Tejun Heo7d77b242007-09-23 13:14:13 +09001084 * sata_async_notification - SATA async notification handler
1085 * @ap: ATA port where async notification is received
1086 *
1087 * Handler to be called when async notification via SDB FIS is
1088 * received. This function schedules EH if necessary.
1089 *
1090 * LOCKING:
1091 * spin_lock_irqsave(host lock)
1092 *
1093 * RETURNS:
1094 * 1 if EH is scheduled, 0 otherwise.
1095 */
1096int sata_async_notification(struct ata_port *ap)
1097{
1098 u32 sntf;
1099 int rc;
1100
1101 if (!(ap->flags & ATA_FLAG_AN))
1102 return 0;
1103
1104 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
1105 if (rc == 0)
1106 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
1107
Tejun Heo071f44b2008-04-07 22:47:22 +09001108 if (!sata_pmp_attached(ap) || rc) {
Tejun Heo7d77b242007-09-23 13:14:13 +09001109 /* PMP is not attached or SNTF is not available */
Tejun Heo071f44b2008-04-07 22:47:22 +09001110 if (!sata_pmp_attached(ap)) {
Tejun Heo7d77b242007-09-23 13:14:13 +09001111 /* PMP is not attached. Check whether ATAPI
1112 * AN is configured. If so, notify media
1113 * change.
1114 */
1115 struct ata_device *dev = ap->link.device;
1116
1117 if ((dev->class == ATA_DEV_ATAPI) &&
1118 (dev->flags & ATA_DFLAG_AN))
1119 ata_scsi_media_change_notify(dev);
1120 return 0;
1121 } else {
1122 /* PMP is attached but SNTF is not available.
1123 * ATAPI async media change notification is
1124 * not used. The PMP must be reporting PHY
1125 * status change, schedule EH.
1126 */
1127 ata_port_schedule_eh(ap);
1128 return 1;
1129 }
1130 } else {
1131 /* PMP is attached and SNTF is available */
1132 struct ata_link *link;
1133
1134 /* check and notify ATAPI AN */
Tejun Heo1eca4362008-11-03 20:03:17 +09001135 ata_for_each_link(link, ap, EDGE) {
Tejun Heo7d77b242007-09-23 13:14:13 +09001136 if (!(sntf & (1 << link->pmp)))
1137 continue;
1138
1139 if ((link->device->class == ATA_DEV_ATAPI) &&
1140 (link->device->flags & ATA_DFLAG_AN))
1141 ata_scsi_media_change_notify(link->device);
1142 }
1143
1144 /* If PMP is reporting that PHY status of some
1145 * downstream ports has changed, schedule EH.
1146 */
1147 if (sntf & (1 << SATA_PMP_CTRL_PORT)) {
1148 ata_port_schedule_eh(ap);
1149 return 1;
1150 }
1151
1152 return 0;
1153 }
1154}
1155
1156/**
Tejun Heoe3180492006-05-15 20:58:09 +09001157 * ata_eh_freeze_port - EH helper to freeze port
1158 * @ap: ATA port to freeze
1159 *
1160 * Freeze @ap.
1161 *
1162 * LOCKING:
1163 * None.
1164 */
1165void ata_eh_freeze_port(struct ata_port *ap)
1166{
1167 unsigned long flags;
1168
1169 if (!ap->ops->error_handler)
1170 return;
1171
Jeff Garzikba6a1302006-06-22 23:46:10 -04001172 spin_lock_irqsave(ap->lock, flags);
Tejun Heoe3180492006-05-15 20:58:09 +09001173 __ata_port_freeze(ap);
Jeff Garzikba6a1302006-06-22 23:46:10 -04001174 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoe3180492006-05-15 20:58:09 +09001175}
1176
1177/**
1178 * ata_port_thaw_port - EH helper to thaw port
1179 * @ap: ATA port to thaw
1180 *
1181 * Thaw frozen port @ap.
1182 *
1183 * LOCKING:
1184 * None.
1185 */
1186void ata_eh_thaw_port(struct ata_port *ap)
1187{
1188 unsigned long flags;
1189
1190 if (!ap->ops->error_handler)
1191 return;
1192
Jeff Garzikba6a1302006-06-22 23:46:10 -04001193 spin_lock_irqsave(ap->lock, flags);
Tejun Heoe3180492006-05-15 20:58:09 +09001194
Tejun Heob51e9e52006-06-29 01:29:30 +09001195 ap->pflags &= ~ATA_PFLAG_FROZEN;
Tejun Heoe3180492006-05-15 20:58:09 +09001196
1197 if (ap->ops->thaw)
1198 ap->ops->thaw(ap);
1199
Jeff Garzikba6a1302006-06-22 23:46:10 -04001200 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoe3180492006-05-15 20:58:09 +09001201
Tejun Heo44877b42007-02-21 01:06:51 +09001202 DPRINTK("ata%u port thawed\n", ap->print_id);
Tejun Heoe3180492006-05-15 20:58:09 +09001203}
1204
Tejun Heoece1d632006-04-02 18:51:53 +09001205static void ata_eh_scsidone(struct scsi_cmnd *scmd)
1206{
1207 /* nada */
1208}
1209
1210static void __ata_eh_qc_complete(struct ata_queued_cmd *qc)
1211{
1212 struct ata_port *ap = qc->ap;
1213 struct scsi_cmnd *scmd = qc->scsicmd;
1214 unsigned long flags;
1215
Jeff Garzikba6a1302006-06-22 23:46:10 -04001216 spin_lock_irqsave(ap->lock, flags);
Tejun Heoece1d632006-04-02 18:51:53 +09001217 qc->scsidone = ata_eh_scsidone;
1218 __ata_qc_complete(qc);
1219 WARN_ON(ata_tag_valid(qc->tag));
Jeff Garzikba6a1302006-06-22 23:46:10 -04001220 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heoece1d632006-04-02 18:51:53 +09001221
1222 scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
1223}
1224
1225/**
1226 * ata_eh_qc_complete - Complete an active ATA command from EH
1227 * @qc: Command to complete
1228 *
1229 * Indicate to the mid and upper layers that an ATA command has
1230 * completed. To be used from EH.
1231 */
1232void ata_eh_qc_complete(struct ata_queued_cmd *qc)
1233{
1234 struct scsi_cmnd *scmd = qc->scsicmd;
1235 scmd->retries = scmd->allowed;
1236 __ata_eh_qc_complete(qc);
1237}
1238
1239/**
1240 * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
1241 * @qc: Command to retry
1242 *
1243 * Indicate to the mid and upper layers that an ATA command
1244 * should be retried. To be used from EH.
1245 *
1246 * SCSI midlayer limits the number of retries to scmd->allowed.
1247 * scmd->retries is decremented for commands which get retried
1248 * due to unrelated failures (qc->err_mask is zero).
1249 */
1250void ata_eh_qc_retry(struct ata_queued_cmd *qc)
1251{
1252 struct scsi_cmnd *scmd = qc->scsicmd;
1253 if (!qc->err_mask && scmd->retries)
1254 scmd->retries--;
1255 __ata_eh_qc_complete(qc);
1256}
Tejun Heo022bdb02006-05-15 20:58:22 +09001257
1258/**
Tejun Heo678afac2009-01-29 20:31:30 +09001259 * ata_dev_disable - disable ATA device
1260 * @dev: ATA device to disable
1261 *
1262 * Disable @dev.
1263 *
1264 * Locking:
1265 * EH context.
1266 */
1267void ata_dev_disable(struct ata_device *dev)
1268{
1269 if (!ata_dev_enabled(dev))
1270 return;
1271
1272 if (ata_msg_drv(dev->link->ap))
1273 ata_dev_printk(dev, KERN_WARNING, "disabled\n");
1274 ata_acpi_on_disable(dev);
1275 ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 | ATA_DNXFER_QUIET);
1276 dev->class++;
Tejun Heo99cf6102009-01-29 20:31:32 +09001277
1278 /* From now till the next successful probe, ering is used to
1279 * track probe failures. Clear accumulated device error info.
1280 */
1281 ata_ering_clear(&dev->ering);
Tejun Heo678afac2009-01-29 20:31:30 +09001282}
1283
1284/**
Tejun Heo0ea035a2006-05-31 18:28:01 +09001285 * ata_eh_detach_dev - detach ATA device
1286 * @dev: ATA device to detach
1287 *
1288 * Detach @dev.
1289 *
1290 * LOCKING:
1291 * None.
1292 */
Tejun Heofb7fd612007-09-23 13:14:12 +09001293void ata_eh_detach_dev(struct ata_device *dev)
Tejun Heo0ea035a2006-05-31 18:28:01 +09001294{
Tejun Heof58229f2007-08-06 18:36:23 +09001295 struct ata_link *link = dev->link;
1296 struct ata_port *ap = link->ap;
Tejun Heo90484eb2008-10-26 15:43:03 +09001297 struct ata_eh_context *ehc = &link->eh_context;
Tejun Heo0ea035a2006-05-31 18:28:01 +09001298 unsigned long flags;
1299
1300 ata_dev_disable(dev);
1301
Jeff Garzikba6a1302006-06-22 23:46:10 -04001302 spin_lock_irqsave(ap->lock, flags);
Tejun Heo0ea035a2006-05-31 18:28:01 +09001303
1304 dev->flags &= ~ATA_DFLAG_DETACH;
1305
1306 if (ata_scsi_offline_dev(dev)) {
1307 dev->flags |= ATA_DFLAG_DETACHED;
Tejun Heob51e9e52006-06-29 01:29:30 +09001308 ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG;
Tejun Heo0ea035a2006-05-31 18:28:01 +09001309 }
1310
Tejun Heo90484eb2008-10-26 15:43:03 +09001311 /* clear per-dev EH info */
Tejun Heof58229f2007-08-06 18:36:23 +09001312 ata_eh_clear_action(link, dev, &link->eh_info, ATA_EH_PERDEV_MASK);
1313 ata_eh_clear_action(link, dev, &link->eh_context.i, ATA_EH_PERDEV_MASK);
Tejun Heo90484eb2008-10-26 15:43:03 +09001314 ehc->saved_xfer_mode[dev->devno] = 0;
1315 ehc->saved_ncq_enabled &= ~(1 << dev->devno);
Tejun Heobeb07c12006-06-24 20:30:19 +09001316
Jeff Garzikba6a1302006-06-22 23:46:10 -04001317 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heo0ea035a2006-05-31 18:28:01 +09001318}
1319
1320/**
Tejun Heo022bdb02006-05-15 20:58:22 +09001321 * ata_eh_about_to_do - about to perform eh_action
Tejun Heo955e57d2007-08-06 18:36:23 +09001322 * @link: target ATA link
Tejun Heo47005f22006-06-19 18:27:23 +09001323 * @dev: target ATA dev for per-dev action (can be NULL)
Tejun Heo022bdb02006-05-15 20:58:22 +09001324 * @action: action about to be performed
1325 *
1326 * Called just before performing EH actions to clear related bits
Tejun Heo955e57d2007-08-06 18:36:23 +09001327 * in @link->eh_info such that eh actions are not unnecessarily
1328 * repeated.
Tejun Heo022bdb02006-05-15 20:58:22 +09001329 *
1330 * LOCKING:
1331 * None.
1332 */
Tejun Heofb7fd612007-09-23 13:14:12 +09001333void ata_eh_about_to_do(struct ata_link *link, struct ata_device *dev,
1334 unsigned int action)
Tejun Heo022bdb02006-05-15 20:58:22 +09001335{
Tejun Heo955e57d2007-08-06 18:36:23 +09001336 struct ata_port *ap = link->ap;
1337 struct ata_eh_info *ehi = &link->eh_info;
1338 struct ata_eh_context *ehc = &link->eh_context;
Tejun Heo022bdb02006-05-15 20:58:22 +09001339 unsigned long flags;
1340
Jeff Garzikba6a1302006-06-22 23:46:10 -04001341 spin_lock_irqsave(ap->lock, flags);
Tejun Heo1cdaf532006-07-03 16:07:26 +09001342
Tejun Heo955e57d2007-08-06 18:36:23 +09001343 ata_eh_clear_action(link, dev, ehi, action);
Tejun Heo13abf502006-07-10 23:18:46 +09001344
Tejun Heoa568d1d2008-10-21 20:37:21 +09001345 /* About to take EH action, set RECOVERED. Ignore actions on
1346 * slave links as master will do them again.
1347 */
1348 if (!(ehc->i.flags & ATA_EHI_QUIET) && link != ap->slave_link)
Tejun Heo1cdaf532006-07-03 16:07:26 +09001349 ap->pflags |= ATA_PFLAG_RECOVERED;
1350
Jeff Garzikba6a1302006-06-22 23:46:10 -04001351 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heo022bdb02006-05-15 20:58:22 +09001352}
1353
1354/**
Tejun Heo47005f22006-06-19 18:27:23 +09001355 * ata_eh_done - EH action complete
Tejun Heo955e57d2007-08-06 18:36:23 +09001356* @ap: target ATA port
Tejun Heo47005f22006-06-19 18:27:23 +09001357 * @dev: target ATA dev for per-dev action (can be NULL)
1358 * @action: action just completed
1359 *
1360 * Called right after performing EH actions to clear related bits
Tejun Heo955e57d2007-08-06 18:36:23 +09001361 * in @link->eh_context.
Tejun Heo47005f22006-06-19 18:27:23 +09001362 *
1363 * LOCKING:
1364 * None.
1365 */
Tejun Heofb7fd612007-09-23 13:14:12 +09001366void ata_eh_done(struct ata_link *link, struct ata_device *dev,
1367 unsigned int action)
Tejun Heo47005f22006-06-19 18:27:23 +09001368{
Tejun Heo955e57d2007-08-06 18:36:23 +09001369 struct ata_eh_context *ehc = &link->eh_context;
Tejun Heo9af5c9c2007-08-06 18:36:22 +09001370
Tejun Heo955e57d2007-08-06 18:36:23 +09001371 ata_eh_clear_action(link, dev, &ehc->i, action);
Tejun Heo47005f22006-06-19 18:27:23 +09001372}
1373
1374/**
Tejun Heo022bdb02006-05-15 20:58:22 +09001375 * ata_err_string - convert err_mask to descriptive string
1376 * @err_mask: error mask to convert to string
1377 *
1378 * Convert @err_mask to descriptive string. Errors are
1379 * prioritized according to severity and only the most severe
1380 * error is reported.
1381 *
1382 * LOCKING:
1383 * None.
1384 *
1385 * RETURNS:
1386 * Descriptive string for @err_mask
1387 */
Jeff Garzik2dcb4072007-10-19 06:42:56 -04001388static const char *ata_err_string(unsigned int err_mask)
Tejun Heo022bdb02006-05-15 20:58:22 +09001389{
1390 if (err_mask & AC_ERR_HOST_BUS)
1391 return "host bus error";
1392 if (err_mask & AC_ERR_ATA_BUS)
1393 return "ATA bus error";
1394 if (err_mask & AC_ERR_TIMEOUT)
1395 return "timeout";
1396 if (err_mask & AC_ERR_HSM)
1397 return "HSM violation";
1398 if (err_mask & AC_ERR_SYSTEM)
1399 return "internal error";
1400 if (err_mask & AC_ERR_MEDIA)
1401 return "media error";
1402 if (err_mask & AC_ERR_INVALID)
1403 return "invalid argument";
1404 if (err_mask & AC_ERR_DEV)
1405 return "device error";
1406 return "unknown error";
1407}
1408
1409/**
Tejun Heoe8ee8452006-05-15 21:03:46 +09001410 * ata_read_log_page - read a specific log page
1411 * @dev: target device
1412 * @page: page to read
1413 * @buf: buffer to store read page
1414 * @sectors: number of sectors to read
1415 *
1416 * Read log page using READ_LOG_EXT command.
1417 *
1418 * LOCKING:
1419 * Kernel thread context (may sleep).
1420 *
1421 * RETURNS:
1422 * 0 on success, AC_ERR_* mask otherwise.
1423 */
1424static unsigned int ata_read_log_page(struct ata_device *dev,
1425 u8 page, void *buf, unsigned int sectors)
1426{
1427 struct ata_taskfile tf;
1428 unsigned int err_mask;
1429
1430 DPRINTK("read log page - page %d\n", page);
1431
1432 ata_tf_init(dev, &tf);
1433 tf.command = ATA_CMD_READ_LOG_EXT;
1434 tf.lbal = page;
1435 tf.nsect = sectors;
1436 tf.hob_nsect = sectors >> 8;
1437 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_LBA48 | ATA_TFLAG_DEVICE;
1438 tf.protocol = ATA_PROT_PIO;
1439
1440 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
Tejun Heo2b789102007-10-09 15:05:44 +09001441 buf, sectors * ATA_SECT_SIZE, 0);
Tejun Heoe8ee8452006-05-15 21:03:46 +09001442
1443 DPRINTK("EXIT, err_mask=%x\n", err_mask);
1444 return err_mask;
1445}
1446
1447/**
1448 * ata_eh_read_log_10h - Read log page 10h for NCQ error details
1449 * @dev: Device to read log page 10h from
1450 * @tag: Resulting tag of the failed command
1451 * @tf: Resulting taskfile registers of the failed command
1452 *
1453 * Read log page 10h to obtain NCQ error details and clear error
1454 * condition.
1455 *
1456 * LOCKING:
1457 * Kernel thread context (may sleep).
1458 *
1459 * RETURNS:
1460 * 0 on success, -errno otherwise.
1461 */
1462static int ata_eh_read_log_10h(struct ata_device *dev,
1463 int *tag, struct ata_taskfile *tf)
1464{
Tejun Heo9af5c9c2007-08-06 18:36:22 +09001465 u8 *buf = dev->link->ap->sector_buf;
Tejun Heoe8ee8452006-05-15 21:03:46 +09001466 unsigned int err_mask;
1467 u8 csum;
1468 int i;
1469
1470 err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, buf, 1);
1471 if (err_mask)
1472 return -EIO;
1473
1474 csum = 0;
1475 for (i = 0; i < ATA_SECT_SIZE; i++)
1476 csum += buf[i];
1477 if (csum)
1478 ata_dev_printk(dev, KERN_WARNING,
1479 "invalid checksum 0x%x on log page 10h\n", csum);
1480
1481 if (buf[0] & 0x80)
1482 return -ENOENT;
1483
1484 *tag = buf[0] & 0x1f;
1485
1486 tf->command = buf[2];
1487 tf->feature = buf[3];
1488 tf->lbal = buf[4];
1489 tf->lbam = buf[5];
1490 tf->lbah = buf[6];
1491 tf->device = buf[7];
1492 tf->hob_lbal = buf[8];
1493 tf->hob_lbam = buf[9];
1494 tf->hob_lbah = buf[10];
1495 tf->nsect = buf[12];
1496 tf->hob_nsect = buf[13];
1497
1498 return 0;
1499}
1500
1501/**
Tejun Heo11fc33d2008-08-30 14:20:01 +02001502 * atapi_eh_tur - perform ATAPI TEST_UNIT_READY
1503 * @dev: target ATAPI device
1504 * @r_sense_key: out parameter for sense_key
1505 *
1506 * Perform ATAPI TEST_UNIT_READY.
1507 *
1508 * LOCKING:
1509 * EH context (may sleep).
1510 *
1511 * RETURNS:
1512 * 0 on success, AC_ERR_* mask on failure.
1513 */
1514static unsigned int atapi_eh_tur(struct ata_device *dev, u8 *r_sense_key)
1515{
1516 u8 cdb[ATAPI_CDB_LEN] = { TEST_UNIT_READY, 0, 0, 0, 0, 0 };
1517 struct ata_taskfile tf;
1518 unsigned int err_mask;
1519
1520 ata_tf_init(dev, &tf);
1521
1522 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1523 tf.command = ATA_CMD_PACKET;
1524 tf.protocol = ATAPI_PROT_NODATA;
1525
1526 err_mask = ata_exec_internal(dev, &tf, cdb, DMA_NONE, NULL, 0, 0);
1527 if (err_mask == AC_ERR_DEV)
1528 *r_sense_key = tf.feature >> 4;
1529 return err_mask;
1530}
1531
1532/**
Tejun Heo022bdb02006-05-15 20:58:22 +09001533 * atapi_eh_request_sense - perform ATAPI REQUEST_SENSE
1534 * @dev: device to perform REQUEST_SENSE to
1535 * @sense_buf: result sense data buffer (SCSI_SENSE_BUFFERSIZE bytes long)
Tejun Heo3eabddb2008-06-10 18:28:05 +09001536 * @dfl_sense_key: default sense key to use
Tejun Heo022bdb02006-05-15 20:58:22 +09001537 *
1538 * Perform ATAPI REQUEST_SENSE after the device reported CHECK
1539 * SENSE. This function is EH helper.
1540 *
1541 * LOCKING:
1542 * Kernel thread context (may sleep).
1543 *
1544 * RETURNS:
1545 * 0 on success, AC_ERR_* mask on failure
1546 */
Tejun Heo3eabddb2008-06-10 18:28:05 +09001547static unsigned int atapi_eh_request_sense(struct ata_device *dev,
1548 u8 *sense_buf, u8 dfl_sense_key)
Tejun Heo022bdb02006-05-15 20:58:22 +09001549{
Tejun Heo3eabddb2008-06-10 18:28:05 +09001550 u8 cdb[ATAPI_CDB_LEN] =
1551 { REQUEST_SENSE, 0, 0, 0, SCSI_SENSE_BUFFERSIZE, 0 };
Tejun Heo9af5c9c2007-08-06 18:36:22 +09001552 struct ata_port *ap = dev->link->ap;
Tejun Heo022bdb02006-05-15 20:58:22 +09001553 struct ata_taskfile tf;
Tejun Heo022bdb02006-05-15 20:58:22 +09001554
1555 DPRINTK("ATAPI request sense\n");
1556
Tejun Heo022bdb02006-05-15 20:58:22 +09001557 /* FIXME: is this needed? */
1558 memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
1559
Albert Lee56287762007-04-02 11:30:46 +08001560 /* initialize sense_buf with the error register,
1561 * for the case where they are -not- overwritten
1562 */
Tejun Heo022bdb02006-05-15 20:58:22 +09001563 sense_buf[0] = 0x70;
Tejun Heo3eabddb2008-06-10 18:28:05 +09001564 sense_buf[2] = dfl_sense_key;
Albert Lee56287762007-04-02 11:30:46 +08001565
Jeff Garzika617c092007-05-21 20:14:23 -04001566 /* some devices time out if garbage left in tf */
Albert Lee56287762007-04-02 11:30:46 +08001567 ata_tf_init(dev, &tf);
Tejun Heo022bdb02006-05-15 20:58:22 +09001568
Tejun Heo022bdb02006-05-15 20:58:22 +09001569 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1570 tf.command = ATA_CMD_PACKET;
1571
1572 /* is it pointless to prefer PIO for "safety reasons"? */
1573 if (ap->flags & ATA_FLAG_PIO_DMA) {
Tejun Heo0dc36882007-12-18 16:34:43 -05001574 tf.protocol = ATAPI_PROT_DMA;
Tejun Heo022bdb02006-05-15 20:58:22 +09001575 tf.feature |= ATAPI_PKT_DMA;
1576 } else {
Tejun Heo0dc36882007-12-18 16:34:43 -05001577 tf.protocol = ATAPI_PROT_PIO;
Tejun Heof2dfc1a2007-12-12 12:12:46 +09001578 tf.lbam = SCSI_SENSE_BUFFERSIZE;
1579 tf.lbah = 0;
Tejun Heo022bdb02006-05-15 20:58:22 +09001580 }
1581
1582 return ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE,
Tejun Heo2b789102007-10-09 15:05:44 +09001583 sense_buf, SCSI_SENSE_BUFFERSIZE, 0);
Tejun Heo022bdb02006-05-15 20:58:22 +09001584}
1585
1586/**
1587 * ata_eh_analyze_serror - analyze SError for a failed port
Tejun Heo02607312007-08-06 18:36:23 +09001588 * @link: ATA link to analyze SError for
Tejun Heo022bdb02006-05-15 20:58:22 +09001589 *
1590 * Analyze SError if available and further determine cause of
1591 * failure.
1592 *
1593 * LOCKING:
1594 * None.
1595 */
Tejun Heo02607312007-08-06 18:36:23 +09001596static void ata_eh_analyze_serror(struct ata_link *link)
Tejun Heo022bdb02006-05-15 20:58:22 +09001597{
Tejun Heo02607312007-08-06 18:36:23 +09001598 struct ata_eh_context *ehc = &link->eh_context;
Tejun Heo022bdb02006-05-15 20:58:22 +09001599 u32 serror = ehc->i.serror;
1600 unsigned int err_mask = 0, action = 0;
Tejun Heof9df58c2007-09-23 13:14:13 +09001601 u32 hotplug_mask;
Tejun Heo022bdb02006-05-15 20:58:22 +09001602
Tejun Heoe0614db2008-05-19 01:15:09 +09001603 if (serror & (SERR_PERSISTENT | SERR_DATA)) {
Tejun Heo022bdb02006-05-15 20:58:22 +09001604 err_mask |= AC_ERR_ATA_BUS;
Tejun Heocf480622008-01-24 00:05:14 +09001605 action |= ATA_EH_RESET;
Tejun Heo022bdb02006-05-15 20:58:22 +09001606 }
1607 if (serror & SERR_PROTOCOL) {
1608 err_mask |= AC_ERR_HSM;
Tejun Heocf480622008-01-24 00:05:14 +09001609 action |= ATA_EH_RESET;
Tejun Heo022bdb02006-05-15 20:58:22 +09001610 }
1611 if (serror & SERR_INTERNAL) {
1612 err_mask |= AC_ERR_SYSTEM;
Tejun Heocf480622008-01-24 00:05:14 +09001613 action |= ATA_EH_RESET;
Tejun Heo022bdb02006-05-15 20:58:22 +09001614 }
Tejun Heof9df58c2007-09-23 13:14:13 +09001615
1616 /* Determine whether a hotplug event has occurred. Both
1617 * SError.N/X are considered hotplug events for enabled or
1618 * host links. For disabled PMP links, only N bit is
1619 * considered as X bit is left at 1 for link plugging.
1620 */
Tejun Heoeb0e85e2011-02-24 19:30:37 +01001621 if (link->lpm_policy > ATA_LPM_MAX_POWER)
Tejun Heo6b7ae952010-09-01 17:50:06 +02001622 hotplug_mask = 0; /* hotplug doesn't work w/ LPM */
1623 else if (!(link->flags & ATA_LFLAG_DISABLED) || ata_is_host_link(link))
Tejun Heof9df58c2007-09-23 13:14:13 +09001624 hotplug_mask = SERR_PHYRDY_CHG | SERR_DEV_XCHG;
1625 else
1626 hotplug_mask = SERR_PHYRDY_CHG;
1627
1628 if (serror & hotplug_mask)
Tejun Heo084fe632006-05-31 18:28:03 +09001629 ata_ehi_hotplugged(&ehc->i);
Tejun Heo022bdb02006-05-15 20:58:22 +09001630
1631 ehc->i.err_mask |= err_mask;
1632 ehc->i.action |= action;
1633}
1634
1635/**
Tejun Heoe8ee8452006-05-15 21:03:46 +09001636 * ata_eh_analyze_ncq_error - analyze NCQ error
Tejun Heo02607312007-08-06 18:36:23 +09001637 * @link: ATA link to analyze NCQ error for
Tejun Heoe8ee8452006-05-15 21:03:46 +09001638 *
1639 * Read log page 10h, determine the offending qc and acquire
1640 * error status TF. For NCQ device errors, all LLDDs have to do
1641 * is setting AC_ERR_DEV in ehi->err_mask. This function takes
1642 * care of the rest.
1643 *
1644 * LOCKING:
1645 * Kernel thread context (may sleep).
1646 */
Mark Lord10acf3b2008-05-02 02:14:53 -04001647void ata_eh_analyze_ncq_error(struct ata_link *link)
Tejun Heoe8ee8452006-05-15 21:03:46 +09001648{
Tejun Heo02607312007-08-06 18:36:23 +09001649 struct ata_port *ap = link->ap;
1650 struct ata_eh_context *ehc = &link->eh_context;
1651 struct ata_device *dev = link->device;
Tejun Heoe8ee8452006-05-15 21:03:46 +09001652 struct ata_queued_cmd *qc;
1653 struct ata_taskfile tf;
1654 int tag, rc;
1655
1656 /* if frozen, we can't do much */
Tejun Heob51e9e52006-06-29 01:29:30 +09001657 if (ap->pflags & ATA_PFLAG_FROZEN)
Tejun Heoe8ee8452006-05-15 21:03:46 +09001658 return;
1659
1660 /* is it NCQ device error? */
Tejun Heo02607312007-08-06 18:36:23 +09001661 if (!link->sactive || !(ehc->i.err_mask & AC_ERR_DEV))
Tejun Heoe8ee8452006-05-15 21:03:46 +09001662 return;
1663
1664 /* has LLDD analyzed already? */
1665 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
1666 qc = __ata_qc_from_tag(ap, tag);
1667
1668 if (!(qc->flags & ATA_QCFLAG_FAILED))
1669 continue;
1670
1671 if (qc->err_mask)
1672 return;
1673 }
1674
1675 /* okay, this error is ours */
Jeff Garzika09bf4c2010-04-22 21:59:13 -04001676 memset(&tf, 0, sizeof(tf));
Tejun Heoe8ee8452006-05-15 21:03:46 +09001677 rc = ata_eh_read_log_10h(dev, &tag, &tf);
1678 if (rc) {
Tejun Heo02607312007-08-06 18:36:23 +09001679 ata_link_printk(link, KERN_ERR, "failed to read log page 10h "
Tejun Heoe8ee8452006-05-15 21:03:46 +09001680 "(errno=%d)\n", rc);
1681 return;
1682 }
1683
Tejun Heo02607312007-08-06 18:36:23 +09001684 if (!(link->sactive & (1 << tag))) {
1685 ata_link_printk(link, KERN_ERR, "log page 10h reported "
Tejun Heoe8ee8452006-05-15 21:03:46 +09001686 "inactive tag %d\n", tag);
1687 return;
1688 }
1689
1690 /* we've got the perpetrator, condemn it */
1691 qc = __ata_qc_from_tag(ap, tag);
1692 memcpy(&qc->result_tf, &tf, sizeof(tf));
Mark Lorda6116c92008-04-23 22:36:25 -04001693 qc->result_tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
Tejun Heo5335b722007-07-16 14:29:40 +09001694 qc->err_mask |= AC_ERR_DEV | AC_ERR_NCQ;
Tejun Heoe8ee8452006-05-15 21:03:46 +09001695 ehc->i.err_mask &= ~AC_ERR_DEV;
1696}
1697
1698/**
Tejun Heo022bdb02006-05-15 20:58:22 +09001699 * ata_eh_analyze_tf - analyze taskfile of a failed qc
1700 * @qc: qc to analyze
1701 * @tf: Taskfile registers to analyze
1702 *
1703 * Analyze taskfile of @qc and further determine cause of
1704 * failure. This function also requests ATAPI sense data if
1705 * avaliable.
1706 *
1707 * LOCKING:
1708 * Kernel thread context (may sleep).
1709 *
1710 * RETURNS:
1711 * Determined recovery action
1712 */
1713static unsigned int ata_eh_analyze_tf(struct ata_queued_cmd *qc,
1714 const struct ata_taskfile *tf)
1715{
1716 unsigned int tmp, action = 0;
1717 u8 stat = tf->command, err = tf->feature;
1718
1719 if ((stat & (ATA_BUSY | ATA_DRQ | ATA_DRDY)) != ATA_DRDY) {
1720 qc->err_mask |= AC_ERR_HSM;
Tejun Heocf480622008-01-24 00:05:14 +09001721 return ATA_EH_RESET;
Tejun Heo022bdb02006-05-15 20:58:22 +09001722 }
1723
Tejun Heoa51d6442007-03-20 15:24:11 +09001724 if (stat & (ATA_ERR | ATA_DF))
1725 qc->err_mask |= AC_ERR_DEV;
1726 else
Tejun Heo022bdb02006-05-15 20:58:22 +09001727 return 0;
1728
1729 switch (qc->dev->class) {
1730 case ATA_DEV_ATA:
1731 if (err & ATA_ICRC)
1732 qc->err_mask |= AC_ERR_ATA_BUS;
1733 if (err & ATA_UNC)
1734 qc->err_mask |= AC_ERR_MEDIA;
1735 if (err & ATA_IDNF)
1736 qc->err_mask |= AC_ERR_INVALID;
1737 break;
1738
1739 case ATA_DEV_ATAPI:
Tejun Heoa569a302006-11-21 10:40:51 +09001740 if (!(qc->ap->pflags & ATA_PFLAG_FROZEN)) {
Tejun Heo3eabddb2008-06-10 18:28:05 +09001741 tmp = atapi_eh_request_sense(qc->dev,
1742 qc->scsicmd->sense_buffer,
1743 qc->result_tf.feature >> 4);
Tejun Heoa569a302006-11-21 10:40:51 +09001744 if (!tmp) {
1745 /* ATA_QCFLAG_SENSE_VALID is used to
1746 * tell atapi_qc_complete() that sense
1747 * data is already valid.
1748 *
1749 * TODO: interpret sense data and set
1750 * appropriate err_mask.
1751 */
1752 qc->flags |= ATA_QCFLAG_SENSE_VALID;
1753 } else
1754 qc->err_mask |= tmp;
1755 }
Tejun Heo022bdb02006-05-15 20:58:22 +09001756 }
1757
1758 if (qc->err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT | AC_ERR_ATA_BUS))
Tejun Heocf480622008-01-24 00:05:14 +09001759 action |= ATA_EH_RESET;
Tejun Heo022bdb02006-05-15 20:58:22 +09001760
1761 return action;
1762}
1763
Tejun Heo76326ac2007-11-27 19:28:59 +09001764static int ata_eh_categorize_error(unsigned int eflags, unsigned int err_mask,
1765 int *xfer_ok)
Tejun Heo022bdb02006-05-15 20:58:22 +09001766{
Tejun Heo76326ac2007-11-27 19:28:59 +09001767 int base = 0;
1768
1769 if (!(eflags & ATA_EFLAG_DUBIOUS_XFER))
1770 *xfer_ok = 1;
1771
1772 if (!*xfer_ok)
Tejun Heo75f9caf2008-01-03 01:21:14 +09001773 base = ATA_ECAT_DUBIOUS_NONE;
Tejun Heo76326ac2007-11-27 19:28:59 +09001774
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001775 if (err_mask & AC_ERR_ATA_BUS)
Tejun Heo76326ac2007-11-27 19:28:59 +09001776 return base + ATA_ECAT_ATA_BUS;
Tejun Heo022bdb02006-05-15 20:58:22 +09001777
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001778 if (err_mask & AC_ERR_TIMEOUT)
Tejun Heo76326ac2007-11-27 19:28:59 +09001779 return base + ATA_ECAT_TOUT_HSM;
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001780
Tejun Heo3884f7b2007-11-27 19:28:56 +09001781 if (eflags & ATA_EFLAG_IS_IO) {
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001782 if (err_mask & AC_ERR_HSM)
Tejun Heo76326ac2007-11-27 19:28:59 +09001783 return base + ATA_ECAT_TOUT_HSM;
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001784 if ((err_mask &
1785 (AC_ERR_DEV|AC_ERR_MEDIA|AC_ERR_INVALID)) == AC_ERR_DEV)
Tejun Heo76326ac2007-11-27 19:28:59 +09001786 return base + ATA_ECAT_UNK_DEV;
Tejun Heo022bdb02006-05-15 20:58:22 +09001787 }
1788
1789 return 0;
1790}
1791
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001792struct speed_down_verdict_arg {
Tejun Heo022bdb02006-05-15 20:58:22 +09001793 u64 since;
Tejun Heo76326ac2007-11-27 19:28:59 +09001794 int xfer_ok;
Tejun Heo3884f7b2007-11-27 19:28:56 +09001795 int nr_errors[ATA_ECAT_NR];
Tejun Heo022bdb02006-05-15 20:58:22 +09001796};
1797
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001798static int speed_down_verdict_cb(struct ata_ering_entry *ent, void *void_arg)
Tejun Heo022bdb02006-05-15 20:58:22 +09001799{
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001800 struct speed_down_verdict_arg *arg = void_arg;
Tejun Heo76326ac2007-11-27 19:28:59 +09001801 int cat;
Tejun Heo022bdb02006-05-15 20:58:22 +09001802
Gwendal Grignoud9027472010-05-25 12:31:38 -07001803 if ((ent->eflags & ATA_EFLAG_OLD_ER) || (ent->timestamp < arg->since))
Tejun Heo022bdb02006-05-15 20:58:22 +09001804 return -1;
1805
Tejun Heo76326ac2007-11-27 19:28:59 +09001806 cat = ata_eh_categorize_error(ent->eflags, ent->err_mask,
1807 &arg->xfer_ok);
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001808 arg->nr_errors[cat]++;
Tejun Heo76326ac2007-11-27 19:28:59 +09001809
Tejun Heo022bdb02006-05-15 20:58:22 +09001810 return 0;
1811}
1812
1813/**
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001814 * ata_eh_speed_down_verdict - Determine speed down verdict
Tejun Heo022bdb02006-05-15 20:58:22 +09001815 * @dev: Device of interest
1816 *
1817 * This function examines error ring of @dev and determines
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001818 * whether NCQ needs to be turned off, transfer speed should be
1819 * stepped down, or falling back to PIO is necessary.
Tejun Heo022bdb02006-05-15 20:58:22 +09001820 *
Tejun Heo3884f7b2007-11-27 19:28:56 +09001821 * ECAT_ATA_BUS : ATA_BUS error for any command
Tejun Heo022bdb02006-05-15 20:58:22 +09001822 *
Tejun Heo3884f7b2007-11-27 19:28:56 +09001823 * ECAT_TOUT_HSM : TIMEOUT for any command or HSM violation for
1824 * IO commands
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001825 *
Tejun Heo3884f7b2007-11-27 19:28:56 +09001826 * ECAT_UNK_DEV : Unknown DEV error for IO commands
Tejun Heo022bdb02006-05-15 20:58:22 +09001827 *
Tejun Heo76326ac2007-11-27 19:28:59 +09001828 * ECAT_DUBIOUS_* : Identical to above three but occurred while
1829 * data transfer hasn't been verified.
1830 *
Tejun Heo3884f7b2007-11-27 19:28:56 +09001831 * Verdicts are
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001832 *
Tejun Heo3884f7b2007-11-27 19:28:56 +09001833 * NCQ_OFF : Turn off NCQ.
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001834 *
Tejun Heo3884f7b2007-11-27 19:28:56 +09001835 * SPEED_DOWN : Speed down transfer speed but don't fall back
1836 * to PIO.
1837 *
1838 * FALLBACK_TO_PIO : Fall back to PIO.
1839 *
1840 * Even if multiple verdicts are returned, only one action is
Tejun Heo76326ac2007-11-27 19:28:59 +09001841 * taken per error. An action triggered by non-DUBIOUS errors
1842 * clears ering, while one triggered by DUBIOUS_* errors doesn't.
1843 * This is to expedite speed down decisions right after device is
1844 * initially configured.
Tejun Heo3884f7b2007-11-27 19:28:56 +09001845 *
Tejun Heo76326ac2007-11-27 19:28:59 +09001846 * The followings are speed down rules. #1 and #2 deal with
1847 * DUBIOUS errors.
1848 *
1849 * 1. If more than one DUBIOUS_ATA_BUS or DUBIOUS_TOUT_HSM errors
1850 * occurred during last 5 mins, SPEED_DOWN and FALLBACK_TO_PIO.
1851 *
1852 * 2. If more than one DUBIOUS_TOUT_HSM or DUBIOUS_UNK_DEV errors
1853 * occurred during last 5 mins, NCQ_OFF.
1854 *
1855 * 3. If more than 8 ATA_BUS, TOUT_HSM or UNK_DEV errors
Tejun Heo3884f7b2007-11-27 19:28:56 +09001856 * ocurred during last 5 mins, FALLBACK_TO_PIO
1857 *
Tejun Heo76326ac2007-11-27 19:28:59 +09001858 * 4. If more than 3 TOUT_HSM or UNK_DEV errors occurred
Tejun Heo3884f7b2007-11-27 19:28:56 +09001859 * during last 10 mins, NCQ_OFF.
1860 *
Tejun Heo76326ac2007-11-27 19:28:59 +09001861 * 5. If more than 3 ATA_BUS or TOUT_HSM errors, or more than 6
Tejun Heo3884f7b2007-11-27 19:28:56 +09001862 * UNK_DEV errors occurred during last 10 mins, SPEED_DOWN.
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001863 *
Tejun Heo022bdb02006-05-15 20:58:22 +09001864 * LOCKING:
1865 * Inherited from caller.
1866 *
1867 * RETURNS:
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001868 * OR of ATA_EH_SPDN_* flags.
Tejun Heo022bdb02006-05-15 20:58:22 +09001869 */
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001870static unsigned int ata_eh_speed_down_verdict(struct ata_device *dev)
Tejun Heo022bdb02006-05-15 20:58:22 +09001871{
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001872 const u64 j5mins = 5LLU * 60 * HZ, j10mins = 10LLU * 60 * HZ;
1873 u64 j64 = get_jiffies_64();
1874 struct speed_down_verdict_arg arg;
1875 unsigned int verdict = 0;
Tejun Heo022bdb02006-05-15 20:58:22 +09001876
Tejun Heo3884f7b2007-11-27 19:28:56 +09001877 /* scan past 5 mins of error history */
1878 memset(&arg, 0, sizeof(arg));
1879 arg.since = j64 - min(j64, j5mins);
1880 ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg);
1881
Tejun Heo76326ac2007-11-27 19:28:59 +09001882 if (arg.nr_errors[ATA_ECAT_DUBIOUS_ATA_BUS] +
1883 arg.nr_errors[ATA_ECAT_DUBIOUS_TOUT_HSM] > 1)
1884 verdict |= ATA_EH_SPDN_SPEED_DOWN |
1885 ATA_EH_SPDN_FALLBACK_TO_PIO | ATA_EH_SPDN_KEEP_ERRORS;
1886
1887 if (arg.nr_errors[ATA_ECAT_DUBIOUS_TOUT_HSM] +
1888 arg.nr_errors[ATA_ECAT_DUBIOUS_UNK_DEV] > 1)
1889 verdict |= ATA_EH_SPDN_NCQ_OFF | ATA_EH_SPDN_KEEP_ERRORS;
1890
Tejun Heo3884f7b2007-11-27 19:28:56 +09001891 if (arg.nr_errors[ATA_ECAT_ATA_BUS] +
1892 arg.nr_errors[ATA_ECAT_TOUT_HSM] +
Tejun Heo663f99b2007-11-27 19:28:57 +09001893 arg.nr_errors[ATA_ECAT_UNK_DEV] > 6)
Tejun Heo3884f7b2007-11-27 19:28:56 +09001894 verdict |= ATA_EH_SPDN_FALLBACK_TO_PIO;
1895
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001896 /* scan past 10 mins of error history */
Tejun Heo022bdb02006-05-15 20:58:22 +09001897 memset(&arg, 0, sizeof(arg));
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001898 arg.since = j64 - min(j64, j10mins);
1899 ata_ering_map(&dev->ering, speed_down_verdict_cb, &arg);
Tejun Heo022bdb02006-05-15 20:58:22 +09001900
Tejun Heo3884f7b2007-11-27 19:28:56 +09001901 if (arg.nr_errors[ATA_ECAT_TOUT_HSM] +
1902 arg.nr_errors[ATA_ECAT_UNK_DEV] > 3)
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001903 verdict |= ATA_EH_SPDN_NCQ_OFF;
Tejun Heo3884f7b2007-11-27 19:28:56 +09001904
1905 if (arg.nr_errors[ATA_ECAT_ATA_BUS] +
1906 arg.nr_errors[ATA_ECAT_TOUT_HSM] > 3 ||
Tejun Heo663f99b2007-11-27 19:28:57 +09001907 arg.nr_errors[ATA_ECAT_UNK_DEV] > 6)
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001908 verdict |= ATA_EH_SPDN_SPEED_DOWN;
Tejun Heo022bdb02006-05-15 20:58:22 +09001909
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001910 return verdict;
Tejun Heo022bdb02006-05-15 20:58:22 +09001911}
1912
1913/**
1914 * ata_eh_speed_down - record error and speed down if necessary
1915 * @dev: Failed device
Tejun Heo3884f7b2007-11-27 19:28:56 +09001916 * @eflags: mask of ATA_EFLAG_* flags
Tejun Heo022bdb02006-05-15 20:58:22 +09001917 * @err_mask: err_mask of the error
1918 *
1919 * Record error and examine error history to determine whether
1920 * adjusting transmission speed is necessary. It also sets
1921 * transmission limits appropriately if such adjustment is
1922 * necessary.
1923 *
1924 * LOCKING:
1925 * Kernel thread context (may sleep).
1926 *
1927 * RETURNS:
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001928 * Determined recovery action.
Tejun Heo022bdb02006-05-15 20:58:22 +09001929 */
Tejun Heo3884f7b2007-11-27 19:28:56 +09001930static unsigned int ata_eh_speed_down(struct ata_device *dev,
1931 unsigned int eflags, unsigned int err_mask)
Tejun Heo022bdb02006-05-15 20:58:22 +09001932{
Tejun Heob1c72912008-07-31 17:02:43 +09001933 struct ata_link *link = ata_dev_phys_link(dev);
Tejun Heo76326ac2007-11-27 19:28:59 +09001934 int xfer_ok = 0;
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001935 unsigned int verdict;
1936 unsigned int action = 0;
1937
1938 /* don't bother if Cat-0 error */
Tejun Heo76326ac2007-11-27 19:28:59 +09001939 if (ata_eh_categorize_error(eflags, err_mask, &xfer_ok) == 0)
Tejun Heo022bdb02006-05-15 20:58:22 +09001940 return 0;
1941
1942 /* record error and determine whether speed down is necessary */
Tejun Heo3884f7b2007-11-27 19:28:56 +09001943 ata_ering_record(&dev->ering, eflags, err_mask);
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001944 verdict = ata_eh_speed_down_verdict(dev);
Tejun Heo022bdb02006-05-15 20:58:22 +09001945
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001946 /* turn off NCQ? */
1947 if ((verdict & ATA_EH_SPDN_NCQ_OFF) &&
1948 (dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ |
1949 ATA_DFLAG_NCQ_OFF)) == ATA_DFLAG_NCQ) {
1950 dev->flags |= ATA_DFLAG_NCQ_OFF;
1951 ata_dev_printk(dev, KERN_WARNING,
1952 "NCQ disabled due to excessive errors\n");
1953 goto done;
1954 }
Tejun Heo022bdb02006-05-15 20:58:22 +09001955
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001956 /* speed down? */
1957 if (verdict & ATA_EH_SPDN_SPEED_DOWN) {
1958 /* speed down SATA link speed if possible */
Tejun Heoa07d4992009-01-29 20:31:33 +09001959 if (sata_down_spd_limit(link, 0) == 0) {
Tejun Heocf480622008-01-24 00:05:14 +09001960 action |= ATA_EH_RESET;
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001961 goto done;
1962 }
Tejun Heo022bdb02006-05-15 20:58:22 +09001963
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001964 /* lower transfer mode */
1965 if (dev->spdn_cnt < 2) {
1966 static const int dma_dnxfer_sel[] =
1967 { ATA_DNXFER_DMA, ATA_DNXFER_40C };
1968 static const int pio_dnxfer_sel[] =
1969 { ATA_DNXFER_PIO, ATA_DNXFER_FORCE_PIO0 };
1970 int sel;
Tejun Heo022bdb02006-05-15 20:58:22 +09001971
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001972 if (dev->xfer_shift != ATA_SHIFT_PIO)
1973 sel = dma_dnxfer_sel[dev->spdn_cnt];
1974 else
1975 sel = pio_dnxfer_sel[dev->spdn_cnt];
1976
1977 dev->spdn_cnt++;
1978
1979 if (ata_down_xfermask_limit(dev, sel) == 0) {
Tejun Heocf480622008-01-24 00:05:14 +09001980 action |= ATA_EH_RESET;
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001981 goto done;
1982 }
1983 }
1984 }
1985
1986 /* Fall back to PIO? Slowing down to PIO is meaningless for
Tejun Heo663f99b2007-11-27 19:28:57 +09001987 * SATA ATA devices. Consider it only for PATA and SATAPI.
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001988 */
1989 if ((verdict & ATA_EH_SPDN_FALLBACK_TO_PIO) && (dev->spdn_cnt >= 2) &&
Tejun Heo663f99b2007-11-27 19:28:57 +09001990 (link->ap->cbl != ATA_CBL_SATA || dev->class == ATA_DEV_ATAPI) &&
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001991 (dev->xfer_shift != ATA_SHIFT_PIO)) {
1992 if (ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO) == 0) {
1993 dev->spdn_cnt = 0;
Tejun Heocf480622008-01-24 00:05:14 +09001994 action |= ATA_EH_RESET;
Tejun Heo7d47e8d2007-02-02 16:22:31 +09001995 goto done;
1996 }
1997 }
1998
Tejun Heo022bdb02006-05-15 20:58:22 +09001999 return 0;
Tejun Heo7d47e8d2007-02-02 16:22:31 +09002000 done:
2001 /* device has been slowed down, blow error history */
Tejun Heo76326ac2007-11-27 19:28:59 +09002002 if (!(verdict & ATA_EH_SPDN_KEEP_ERRORS))
2003 ata_ering_clear(&dev->ering);
Tejun Heo7d47e8d2007-02-02 16:22:31 +09002004 return action;
Tejun Heo022bdb02006-05-15 20:58:22 +09002005}
2006
2007/**
Tejun Heo9b1e2652007-08-06 18:36:24 +09002008 * ata_eh_link_autopsy - analyze error and determine recovery action
2009 * @link: host link to perform autopsy on
Tejun Heo022bdb02006-05-15 20:58:22 +09002010 *
Tejun Heo02607312007-08-06 18:36:23 +09002011 * Analyze why @link failed and determine which recovery actions
2012 * are needed. This function also sets more detailed AC_ERR_*
2013 * values and fills sense data for ATAPI CHECK SENSE.
Tejun Heo022bdb02006-05-15 20:58:22 +09002014 *
2015 * LOCKING:
2016 * Kernel thread context (may sleep).
2017 */
Tejun Heo9b1e2652007-08-06 18:36:24 +09002018static void ata_eh_link_autopsy(struct ata_link *link)
Tejun Heo022bdb02006-05-15 20:58:22 +09002019{
Tejun Heo02607312007-08-06 18:36:23 +09002020 struct ata_port *ap = link->ap;
Tejun Heo936fd732007-08-06 18:36:23 +09002021 struct ata_eh_context *ehc = &link->eh_context;
Tejun Heodfcc1732007-10-31 10:17:05 +09002022 struct ata_device *dev;
Tejun Heo3884f7b2007-11-27 19:28:56 +09002023 unsigned int all_err_mask = 0, eflags = 0;
2024 int tag;
Tejun Heo022bdb02006-05-15 20:58:22 +09002025 u32 serror;
2026 int rc;
2027
2028 DPRINTK("ENTER\n");
2029
Tejun Heo1cdaf532006-07-03 16:07:26 +09002030 if (ehc->i.flags & ATA_EHI_NO_AUTOPSY)
2031 return;
2032
Tejun Heo022bdb02006-05-15 20:58:22 +09002033 /* obtain and analyze SError */
Tejun Heo936fd732007-08-06 18:36:23 +09002034 rc = sata_scr_read(link, SCR_ERROR, &serror);
Tejun Heo022bdb02006-05-15 20:58:22 +09002035 if (rc == 0) {
2036 ehc->i.serror |= serror;
Tejun Heo02607312007-08-06 18:36:23 +09002037 ata_eh_analyze_serror(link);
Tejun Heo4e57c512007-07-16 14:29:41 +09002038 } else if (rc != -EOPNOTSUPP) {
Tejun Heocf480622008-01-24 00:05:14 +09002039 /* SError read failed, force reset and probing */
Tejun Heob558edd2008-01-24 00:05:14 +09002040 ehc->i.probe_mask |= ATA_ALL_DEVICES;
Tejun Heocf480622008-01-24 00:05:14 +09002041 ehc->i.action |= ATA_EH_RESET;
Tejun Heo4e57c512007-07-16 14:29:41 +09002042 ehc->i.err_mask |= AC_ERR_OTHER;
2043 }
Tejun Heo022bdb02006-05-15 20:58:22 +09002044
Tejun Heoe8ee8452006-05-15 21:03:46 +09002045 /* analyze NCQ failure */
Tejun Heo02607312007-08-06 18:36:23 +09002046 ata_eh_analyze_ncq_error(link);
Tejun Heoe8ee8452006-05-15 21:03:46 +09002047
Tejun Heo022bdb02006-05-15 20:58:22 +09002048 /* any real error trumps AC_ERR_OTHER */
2049 if (ehc->i.err_mask & ~AC_ERR_OTHER)
2050 ehc->i.err_mask &= ~AC_ERR_OTHER;
2051
2052 all_err_mask |= ehc->i.err_mask;
2053
2054 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
2055 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
2056
Tejun Heob1c72912008-07-31 17:02:43 +09002057 if (!(qc->flags & ATA_QCFLAG_FAILED) ||
2058 ata_dev_phys_link(qc->dev) != link)
Tejun Heo022bdb02006-05-15 20:58:22 +09002059 continue;
2060
2061 /* inherit upper level err_mask */
2062 qc->err_mask |= ehc->i.err_mask;
2063
Tejun Heo022bdb02006-05-15 20:58:22 +09002064 /* analyze TF */
Tejun Heo4528e4d2006-07-08 20:17:26 +09002065 ehc->i.action |= ata_eh_analyze_tf(qc, &qc->result_tf);
Tejun Heo022bdb02006-05-15 20:58:22 +09002066
2067 /* DEV errors are probably spurious in case of ATA_BUS error */
2068 if (qc->err_mask & AC_ERR_ATA_BUS)
2069 qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_MEDIA |
2070 AC_ERR_INVALID);
2071
2072 /* any real error trumps unknown error */
2073 if (qc->err_mask & ~AC_ERR_OTHER)
2074 qc->err_mask &= ~AC_ERR_OTHER;
2075
2076 /* SENSE_VALID trumps dev/unknown error and revalidation */
Tejun Heof90f0822007-10-26 16:12:41 +09002077 if (qc->flags & ATA_QCFLAG_SENSE_VALID)
Tejun Heo022bdb02006-05-15 20:58:22 +09002078 qc->err_mask &= ~(AC_ERR_DEV | AC_ERR_OTHER);
Tejun Heo022bdb02006-05-15 20:58:22 +09002079
Tejun Heo03faab72008-03-27 19:14:24 +09002080 /* determine whether the command is worth retrying */
Tejun Heo534ead72010-01-14 16:18:09 +09002081 if (qc->flags & ATA_QCFLAG_IO ||
2082 (!(qc->err_mask & AC_ERR_INVALID) &&
2083 qc->err_mask != AC_ERR_DEV))
Tejun Heo03faab72008-03-27 19:14:24 +09002084 qc->flags |= ATA_QCFLAG_RETRY;
2085
Tejun Heo022bdb02006-05-15 20:58:22 +09002086 /* accumulate error info */
Tejun Heo4528e4d2006-07-08 20:17:26 +09002087 ehc->i.dev = qc->dev;
Tejun Heo022bdb02006-05-15 20:58:22 +09002088 all_err_mask |= qc->err_mask;
2089 if (qc->flags & ATA_QCFLAG_IO)
Tejun Heo3884f7b2007-11-27 19:28:56 +09002090 eflags |= ATA_EFLAG_IS_IO;
Tejun Heo022bdb02006-05-15 20:58:22 +09002091 }
2092
Tejun Heoa20f33f2006-05-16 12:58:24 +09002093 /* enforce default EH actions */
Tejun Heob51e9e52006-06-29 01:29:30 +09002094 if (ap->pflags & ATA_PFLAG_FROZEN ||
Tejun Heoa20f33f2006-05-16 12:58:24 +09002095 all_err_mask & (AC_ERR_HSM | AC_ERR_TIMEOUT))
Tejun Heocf480622008-01-24 00:05:14 +09002096 ehc->i.action |= ATA_EH_RESET;
Tejun Heo3884f7b2007-11-27 19:28:56 +09002097 else if (((eflags & ATA_EFLAG_IS_IO) && all_err_mask) ||
2098 (!(eflags & ATA_EFLAG_IS_IO) && (all_err_mask & ~AC_ERR_DEV)))
Tejun Heo4528e4d2006-07-08 20:17:26 +09002099 ehc->i.action |= ATA_EH_REVALIDATE;
Tejun Heo022bdb02006-05-15 20:58:22 +09002100
Tejun Heodfcc1732007-10-31 10:17:05 +09002101 /* If we have offending qcs and the associated failed device,
2102 * perform per-dev EH action only on the offending device.
2103 */
Tejun Heo4528e4d2006-07-08 20:17:26 +09002104 if (ehc->i.dev) {
Tejun Heo4528e4d2006-07-08 20:17:26 +09002105 ehc->i.dev_action[ehc->i.dev->devno] |=
2106 ehc->i.action & ATA_EH_PERDEV_MASK;
2107 ehc->i.action &= ~ATA_EH_PERDEV_MASK;
Tejun Heo47005f22006-06-19 18:27:23 +09002108 }
2109
Tejun Heo2695e362008-01-10 13:41:23 +09002110 /* propagate timeout to host link */
2111 if ((all_err_mask & AC_ERR_TIMEOUT) && !ata_is_host_link(link))
2112 ap->link.eh_context.i.err_mask |= AC_ERR_TIMEOUT;
2113
2114 /* record error and consider speeding down */
Tejun Heodfcc1732007-10-31 10:17:05 +09002115 dev = ehc->i.dev;
Tejun Heo2695e362008-01-10 13:41:23 +09002116 if (!dev && ((ata_link_max_devices(link) == 1 &&
2117 ata_dev_enabled(link->device))))
2118 dev = link->device;
Tejun Heodfcc1732007-10-31 10:17:05 +09002119
Tejun Heo76326ac2007-11-27 19:28:59 +09002120 if (dev) {
2121 if (dev->flags & ATA_DFLAG_DUBIOUS_XFER)
2122 eflags |= ATA_EFLAG_DUBIOUS_XFER;
Tejun Heo3884f7b2007-11-27 19:28:56 +09002123 ehc->i.action |= ata_eh_speed_down(dev, eflags, all_err_mask);
Tejun Heo76326ac2007-11-27 19:28:59 +09002124 }
Tejun Heodfcc1732007-10-31 10:17:05 +09002125
Tejun Heo022bdb02006-05-15 20:58:22 +09002126 DPRINTK("EXIT\n");
2127}
2128
2129/**
Tejun Heo9b1e2652007-08-06 18:36:24 +09002130 * ata_eh_autopsy - analyze error and determine recovery action
2131 * @ap: host port to perform autopsy on
2132 *
2133 * Analyze all links of @ap and determine why they failed and
2134 * which recovery actions are needed.
2135 *
2136 * LOCKING:
2137 * Kernel thread context (may sleep).
2138 */
Tejun Heofb7fd612007-09-23 13:14:12 +09002139void ata_eh_autopsy(struct ata_port *ap)
Tejun Heo9b1e2652007-08-06 18:36:24 +09002140{
2141 struct ata_link *link;
2142
Tejun Heo1eca4362008-11-03 20:03:17 +09002143 ata_for_each_link(link, ap, EDGE)
Tejun Heo9b1e2652007-08-06 18:36:24 +09002144 ata_eh_link_autopsy(link);
Tejun Heo2695e362008-01-10 13:41:23 +09002145
Tejun Heob1c72912008-07-31 17:02:43 +09002146 /* Handle the frigging slave link. Autopsy is done similarly
2147 * but actions and flags are transferred over to the master
2148 * link and handled from there.
2149 */
2150 if (ap->slave_link) {
2151 struct ata_eh_context *mehc = &ap->link.eh_context;
2152 struct ata_eh_context *sehc = &ap->slave_link->eh_context;
2153
Tejun Heo848e4c62008-10-21 14:26:39 +09002154 /* transfer control flags from master to slave */
2155 sehc->i.flags |= mehc->i.flags & ATA_EHI_TO_SLAVE_MASK;
2156
2157 /* perform autopsy on the slave link */
Tejun Heob1c72912008-07-31 17:02:43 +09002158 ata_eh_link_autopsy(ap->slave_link);
2159
Tejun Heo848e4c62008-10-21 14:26:39 +09002160 /* transfer actions from slave to master and clear slave */
Tejun Heob1c72912008-07-31 17:02:43 +09002161 ata_eh_about_to_do(ap->slave_link, NULL, ATA_EH_ALL_ACTIONS);
2162 mehc->i.action |= sehc->i.action;
2163 mehc->i.dev_action[1] |= sehc->i.dev_action[1];
2164 mehc->i.flags |= sehc->i.flags;
2165 ata_eh_done(ap->slave_link, NULL, ATA_EH_ALL_ACTIONS);
2166 }
2167
Tejun Heo2695e362008-01-10 13:41:23 +09002168 /* Autopsy of fanout ports can affect host link autopsy.
2169 * Perform host link autopsy last.
2170 */
Tejun Heo071f44b2008-04-07 22:47:22 +09002171 if (sata_pmp_attached(ap))
Tejun Heo2695e362008-01-10 13:41:23 +09002172 ata_eh_link_autopsy(&ap->link);
Tejun Heo9b1e2652007-08-06 18:36:24 +09002173}
2174
2175/**
Robert Hancock65211482009-07-14 20:43:39 -06002176 * ata_get_cmd_descript - get description for ATA command
2177 * @command: ATA command code to get description for
2178 *
2179 * Return a textual description of the given command, or NULL if the
2180 * command is not known.
2181 *
2182 * LOCKING:
2183 * None
2184 */
2185const char *ata_get_cmd_descript(u8 command)
2186{
2187#ifdef CONFIG_ATA_VERBOSE_ERROR
2188 static const struct
2189 {
2190 u8 command;
2191 const char *text;
2192 } cmd_descr[] = {
2193 { ATA_CMD_DEV_RESET, "DEVICE RESET" },
2194 { ATA_CMD_CHK_POWER, "CHECK POWER MODE" },
2195 { ATA_CMD_STANDBY, "STANDBY" },
2196 { ATA_CMD_IDLE, "IDLE" },
2197 { ATA_CMD_EDD, "EXECUTE DEVICE DIAGNOSTIC" },
2198 { ATA_CMD_DOWNLOAD_MICRO, "DOWNLOAD MICROCODE" },
2199 { ATA_CMD_NOP, "NOP" },
2200 { ATA_CMD_FLUSH, "FLUSH CACHE" },
2201 { ATA_CMD_FLUSH_EXT, "FLUSH CACHE EXT" },
2202 { ATA_CMD_ID_ATA, "IDENTIFY DEVICE" },
2203 { ATA_CMD_ID_ATAPI, "IDENTIFY PACKET DEVICE" },
2204 { ATA_CMD_SERVICE, "SERVICE" },
2205 { ATA_CMD_READ, "READ DMA" },
2206 { ATA_CMD_READ_EXT, "READ DMA EXT" },
2207 { ATA_CMD_READ_QUEUED, "READ DMA QUEUED" },
2208 { ATA_CMD_READ_STREAM_EXT, "READ STREAM EXT" },
2209 { ATA_CMD_READ_STREAM_DMA_EXT, "READ STREAM DMA EXT" },
2210 { ATA_CMD_WRITE, "WRITE DMA" },
2211 { ATA_CMD_WRITE_EXT, "WRITE DMA EXT" },
2212 { ATA_CMD_WRITE_QUEUED, "WRITE DMA QUEUED EXT" },
2213 { ATA_CMD_WRITE_STREAM_EXT, "WRITE STREAM EXT" },
2214 { ATA_CMD_WRITE_STREAM_DMA_EXT, "WRITE STREAM DMA EXT" },
2215 { ATA_CMD_WRITE_FUA_EXT, "WRITE DMA FUA EXT" },
2216 { ATA_CMD_WRITE_QUEUED_FUA_EXT, "WRITE DMA QUEUED FUA EXT" },
2217 { ATA_CMD_FPDMA_READ, "READ FPDMA QUEUED" },
2218 { ATA_CMD_FPDMA_WRITE, "WRITE FPDMA QUEUED" },
2219 { ATA_CMD_PIO_READ, "READ SECTOR(S)" },
2220 { ATA_CMD_PIO_READ_EXT, "READ SECTOR(S) EXT" },
2221 { ATA_CMD_PIO_WRITE, "WRITE SECTOR(S)" },
2222 { ATA_CMD_PIO_WRITE_EXT, "WRITE SECTOR(S) EXT" },
2223 { ATA_CMD_READ_MULTI, "READ MULTIPLE" },
2224 { ATA_CMD_READ_MULTI_EXT, "READ MULTIPLE EXT" },
2225 { ATA_CMD_WRITE_MULTI, "WRITE MULTIPLE" },
2226 { ATA_CMD_WRITE_MULTI_EXT, "WRITE MULTIPLE EXT" },
2227 { ATA_CMD_WRITE_MULTI_FUA_EXT, "WRITE MULTIPLE FUA EXT" },
2228 { ATA_CMD_SET_FEATURES, "SET FEATURES" },
2229 { ATA_CMD_SET_MULTI, "SET MULTIPLE MODE" },
2230 { ATA_CMD_VERIFY, "READ VERIFY SECTOR(S)" },
2231 { ATA_CMD_VERIFY_EXT, "READ VERIFY SECTOR(S) EXT" },
2232 { ATA_CMD_WRITE_UNCORR_EXT, "WRITE UNCORRECTABLE EXT" },
2233 { ATA_CMD_STANDBYNOW1, "STANDBY IMMEDIATE" },
2234 { ATA_CMD_IDLEIMMEDIATE, "IDLE IMMEDIATE" },
2235 { ATA_CMD_SLEEP, "SLEEP" },
2236 { ATA_CMD_INIT_DEV_PARAMS, "INITIALIZE DEVICE PARAMETERS" },
2237 { ATA_CMD_READ_NATIVE_MAX, "READ NATIVE MAX ADDRESS" },
2238 { ATA_CMD_READ_NATIVE_MAX_EXT, "READ NATIVE MAX ADDRESS EXT" },
2239 { ATA_CMD_SET_MAX, "SET MAX ADDRESS" },
2240 { ATA_CMD_SET_MAX_EXT, "SET MAX ADDRESS EXT" },
2241 { ATA_CMD_READ_LOG_EXT, "READ LOG EXT" },
2242 { ATA_CMD_WRITE_LOG_EXT, "WRITE LOG EXT" },
2243 { ATA_CMD_READ_LOG_DMA_EXT, "READ LOG DMA EXT" },
2244 { ATA_CMD_WRITE_LOG_DMA_EXT, "WRITE LOG DMA EXT" },
2245 { ATA_CMD_TRUSTED_RCV, "TRUSTED RECEIVE" },
2246 { ATA_CMD_TRUSTED_RCV_DMA, "TRUSTED RECEIVE DMA" },
2247 { ATA_CMD_TRUSTED_SND, "TRUSTED SEND" },
2248 { ATA_CMD_TRUSTED_SND_DMA, "TRUSTED SEND DMA" },
2249 { ATA_CMD_PMP_READ, "READ BUFFER" },
2250 { ATA_CMD_PMP_WRITE, "WRITE BUFFER" },
2251 { ATA_CMD_CONF_OVERLAY, "DEVICE CONFIGURATION OVERLAY" },
2252 { ATA_CMD_SEC_SET_PASS, "SECURITY SET PASSWORD" },
2253 { ATA_CMD_SEC_UNLOCK, "SECURITY UNLOCK" },
2254 { ATA_CMD_SEC_ERASE_PREP, "SECURITY ERASE PREPARE" },
2255 { ATA_CMD_SEC_ERASE_UNIT, "SECURITY ERASE UNIT" },
2256 { ATA_CMD_SEC_FREEZE_LOCK, "SECURITY FREEZE LOCK" },
2257 { ATA_CMD_SEC_DISABLE_PASS, "SECURITY DISABLE PASSWORD" },
2258 { ATA_CMD_CONFIG_STREAM, "CONFIGURE STREAM" },
2259 { ATA_CMD_SMART, "SMART" },
2260 { ATA_CMD_MEDIA_LOCK, "DOOR LOCK" },
2261 { ATA_CMD_MEDIA_UNLOCK, "DOOR UNLOCK" },
FUJITA Tomonoriacad762722010-07-05 15:45:20 +09002262 { ATA_CMD_DSM, "DATA SET MANAGEMENT" },
Robert Hancock65211482009-07-14 20:43:39 -06002263 { ATA_CMD_CHK_MED_CRD_TYP, "CHECK MEDIA CARD TYPE" },
2264 { ATA_CMD_CFA_REQ_EXT_ERR, "CFA REQUEST EXTENDED ERROR" },
2265 { ATA_CMD_CFA_WRITE_NE, "CFA WRITE SECTORS WITHOUT ERASE" },
2266 { ATA_CMD_CFA_TRANS_SECT, "CFA TRANSLATE SECTOR" },
2267 { ATA_CMD_CFA_ERASE, "CFA ERASE SECTORS" },
2268 { ATA_CMD_CFA_WRITE_MULT_NE, "CFA WRITE MULTIPLE WITHOUT ERASE" },
2269 { ATA_CMD_READ_LONG, "READ LONG (with retries)" },
2270 { ATA_CMD_READ_LONG_ONCE, "READ LONG (without retries)" },
2271 { ATA_CMD_WRITE_LONG, "WRITE LONG (with retries)" },
2272 { ATA_CMD_WRITE_LONG_ONCE, "WRITE LONG (without retries)" },
2273 { ATA_CMD_RESTORE, "RECALIBRATE" },
2274 { 0, NULL } /* terminate list */
2275 };
2276
2277 unsigned int i;
2278 for (i = 0; cmd_descr[i].text; i++)
2279 if (cmd_descr[i].command == command)
2280 return cmd_descr[i].text;
2281#endif
2282
2283 return NULL;
2284}
2285
2286/**
Tejun Heo9b1e2652007-08-06 18:36:24 +09002287 * ata_eh_link_report - report error handling to user
Tejun Heo02607312007-08-06 18:36:23 +09002288 * @link: ATA link EH is going on
Tejun Heo022bdb02006-05-15 20:58:22 +09002289 *
2290 * Report EH to user.
2291 *
2292 * LOCKING:
2293 * None.
2294 */
Tejun Heo9b1e2652007-08-06 18:36:24 +09002295static void ata_eh_link_report(struct ata_link *link)
Tejun Heo022bdb02006-05-15 20:58:22 +09002296{
Tejun Heo02607312007-08-06 18:36:23 +09002297 struct ata_port *ap = link->ap;
2298 struct ata_eh_context *ehc = &link->eh_context;
Tejun Heo022bdb02006-05-15 20:58:22 +09002299 const char *frozen, *desc;
Tejun Heoa1e10f72007-08-18 13:28:49 +09002300 char tries_buf[6];
Tejun Heo022bdb02006-05-15 20:58:22 +09002301 int tag, nr_failed = 0;
2302
Tejun Heo94ff3d52007-10-09 14:57:56 +09002303 if (ehc->i.flags & ATA_EHI_QUIET)
2304 return;
2305
Tejun Heo022bdb02006-05-15 20:58:22 +09002306 desc = NULL;
2307 if (ehc->i.desc[0] != '\0')
2308 desc = ehc->i.desc;
2309
2310 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
2311 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
2312
Tejun Heob1c72912008-07-31 17:02:43 +09002313 if (!(qc->flags & ATA_QCFLAG_FAILED) ||
2314 ata_dev_phys_link(qc->dev) != link ||
Tejun Heoe027bd32007-10-26 16:19:26 +09002315 ((qc->flags & ATA_QCFLAG_QUIET) &&
2316 qc->err_mask == AC_ERR_DEV))
Tejun Heo022bdb02006-05-15 20:58:22 +09002317 continue;
2318 if (qc->flags & ATA_QCFLAG_SENSE_VALID && !qc->err_mask)
2319 continue;
2320
2321 nr_failed++;
2322 }
2323
2324 if (!nr_failed && !ehc->i.err_mask)
2325 return;
2326
2327 frozen = "";
Tejun Heob51e9e52006-06-29 01:29:30 +09002328 if (ap->pflags & ATA_PFLAG_FROZEN)
Tejun Heo022bdb02006-05-15 20:58:22 +09002329 frozen = " frozen";
2330
Tejun Heoa1e10f72007-08-18 13:28:49 +09002331 memset(tries_buf, 0, sizeof(tries_buf));
2332 if (ap->eh_tries < ATA_EH_MAX_TRIES)
2333 snprintf(tries_buf, sizeof(tries_buf) - 1, " t%d",
2334 ap->eh_tries);
2335
Tejun Heo022bdb02006-05-15 20:58:22 +09002336 if (ehc->i.dev) {
Tejun Heoe8ee8452006-05-15 21:03:46 +09002337 ata_dev_printk(ehc->i.dev, KERN_ERR, "exception Emask 0x%x "
Tejun Heoa1e10f72007-08-18 13:28:49 +09002338 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
2339 ehc->i.err_mask, link->sactive, ehc->i.serror,
2340 ehc->i.action, frozen, tries_buf);
Tejun Heo022bdb02006-05-15 20:58:22 +09002341 if (desc)
Tejun Heob64bbc32007-07-16 14:29:39 +09002342 ata_dev_printk(ehc->i.dev, KERN_ERR, "%s\n", desc);
Tejun Heo022bdb02006-05-15 20:58:22 +09002343 } else {
Tejun Heo02607312007-08-06 18:36:23 +09002344 ata_link_printk(link, KERN_ERR, "exception Emask 0x%x "
Tejun Heoa1e10f72007-08-18 13:28:49 +09002345 "SAct 0x%x SErr 0x%x action 0x%x%s%s\n",
2346 ehc->i.err_mask, link->sactive, ehc->i.serror,
2347 ehc->i.action, frozen, tries_buf);
Tejun Heo022bdb02006-05-15 20:58:22 +09002348 if (desc)
Tejun Heo02607312007-08-06 18:36:23 +09002349 ata_link_printk(link, KERN_ERR, "%s\n", desc);
Tejun Heo022bdb02006-05-15 20:58:22 +09002350 }
2351
Robert Hancock65211482009-07-14 20:43:39 -06002352#ifdef CONFIG_ATA_VERBOSE_ERROR
Robert Hancock1333e192007-10-02 11:22:02 -04002353 if (ehc->i.serror)
Tejun Heoda0e21d2008-07-31 16:08:38 +09002354 ata_link_printk(link, KERN_ERR,
Robert Hancock1333e192007-10-02 11:22:02 -04002355 "SError: { %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s}\n",
2356 ehc->i.serror & SERR_DATA_RECOVERED ? "RecovData " : "",
2357 ehc->i.serror & SERR_COMM_RECOVERED ? "RecovComm " : "",
2358 ehc->i.serror & SERR_DATA ? "UnrecovData " : "",
2359 ehc->i.serror & SERR_PERSISTENT ? "Persist " : "",
2360 ehc->i.serror & SERR_PROTOCOL ? "Proto " : "",
2361 ehc->i.serror & SERR_INTERNAL ? "HostInt " : "",
2362 ehc->i.serror & SERR_PHYRDY_CHG ? "PHYRdyChg " : "",
2363 ehc->i.serror & SERR_PHY_INT_ERR ? "PHYInt " : "",
2364 ehc->i.serror & SERR_COMM_WAKE ? "CommWake " : "",
2365 ehc->i.serror & SERR_10B_8B_ERR ? "10B8B " : "",
2366 ehc->i.serror & SERR_DISPARITY ? "Dispar " : "",
2367 ehc->i.serror & SERR_CRC ? "BadCRC " : "",
2368 ehc->i.serror & SERR_HANDSHAKE ? "Handshk " : "",
2369 ehc->i.serror & SERR_LINK_SEQ_ERR ? "LinkSeq " : "",
2370 ehc->i.serror & SERR_TRANS_ST_ERROR ? "TrStaTrns " : "",
2371 ehc->i.serror & SERR_UNRECOG_FIS ? "UnrecFIS " : "",
Jeff Garzik2dcb4072007-10-19 06:42:56 -04002372 ehc->i.serror & SERR_DEV_XCHG ? "DevExch " : "");
Robert Hancock65211482009-07-14 20:43:39 -06002373#endif
Robert Hancock1333e192007-10-02 11:22:02 -04002374
Tejun Heo022bdb02006-05-15 20:58:22 +09002375 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
2376 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
Tejun Heo8a937582006-11-14 22:36:12 +09002377 struct ata_taskfile *cmd = &qc->tf, *res = &qc->result_tf;
Tejun Heoabb6a882007-11-28 23:16:09 +09002378 const u8 *cdb = qc->cdb;
2379 char data_buf[20] = "";
2380 char cdb_buf[70] = "";
Tejun Heo022bdb02006-05-15 20:58:22 +09002381
Tejun Heo02607312007-08-06 18:36:23 +09002382 if (!(qc->flags & ATA_QCFLAG_FAILED) ||
Tejun Heob1c72912008-07-31 17:02:43 +09002383 ata_dev_phys_link(qc->dev) != link || !qc->err_mask)
Tejun Heo022bdb02006-05-15 20:58:22 +09002384 continue;
2385
Tejun Heoabb6a882007-11-28 23:16:09 +09002386 if (qc->dma_dir != DMA_NONE) {
2387 static const char *dma_str[] = {
2388 [DMA_BIDIRECTIONAL] = "bidi",
2389 [DMA_TO_DEVICE] = "out",
2390 [DMA_FROM_DEVICE] = "in",
2391 };
2392 static const char *prot_str[] = {
2393 [ATA_PROT_PIO] = "pio",
2394 [ATA_PROT_DMA] = "dma",
2395 [ATA_PROT_NCQ] = "ncq",
Tejun Heo0dc36882007-12-18 16:34:43 -05002396 [ATAPI_PROT_PIO] = "pio",
2397 [ATAPI_PROT_DMA] = "dma",
Tejun Heoabb6a882007-11-28 23:16:09 +09002398 };
2399
2400 snprintf(data_buf, sizeof(data_buf), " %s %u %s",
2401 prot_str[qc->tf.protocol], qc->nbytes,
2402 dma_str[qc->dma_dir]);
2403 }
2404
Robert Hancock65211482009-07-14 20:43:39 -06002405 if (ata_is_atapi(qc->tf.protocol)) {
2406 if (qc->scsicmd)
2407 scsi_print_command(qc->scsicmd);
2408 else
2409 snprintf(cdb_buf, sizeof(cdb_buf),
Tejun Heoabb6a882007-11-28 23:16:09 +09002410 "cdb %02x %02x %02x %02x %02x %02x %02x %02x "
2411 "%02x %02x %02x %02x %02x %02x %02x %02x\n ",
2412 cdb[0], cdb[1], cdb[2], cdb[3],
2413 cdb[4], cdb[5], cdb[6], cdb[7],
2414 cdb[8], cdb[9], cdb[10], cdb[11],
2415 cdb[12], cdb[13], cdb[14], cdb[15]);
Robert Hancock65211482009-07-14 20:43:39 -06002416 } else {
2417 const char *descr = ata_get_cmd_descript(cmd->command);
2418 if (descr)
2419 ata_dev_printk(qc->dev, KERN_ERR,
2420 "failed command: %s\n", descr);
2421 }
Tejun Heoabb6a882007-11-28 23:16:09 +09002422
Tejun Heo8a937582006-11-14 22:36:12 +09002423 ata_dev_printk(qc->dev, KERN_ERR,
2424 "cmd %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
Tejun Heoabb6a882007-11-28 23:16:09 +09002425 "tag %d%s\n %s"
Tejun Heo8a937582006-11-14 22:36:12 +09002426 "res %02x/%02x:%02x:%02x:%02x:%02x/%02x:%02x:%02x:%02x:%02x/%02x "
Tejun Heo5335b722007-07-16 14:29:40 +09002427 "Emask 0x%x (%s)%s\n",
Tejun Heo8a937582006-11-14 22:36:12 +09002428 cmd->command, cmd->feature, cmd->nsect,
2429 cmd->lbal, cmd->lbam, cmd->lbah,
2430 cmd->hob_feature, cmd->hob_nsect,
2431 cmd->hob_lbal, cmd->hob_lbam, cmd->hob_lbah,
Tejun Heoabb6a882007-11-28 23:16:09 +09002432 cmd->device, qc->tag, data_buf, cdb_buf,
Tejun Heo8a937582006-11-14 22:36:12 +09002433 res->command, res->feature, res->nsect,
2434 res->lbal, res->lbam, res->lbah,
2435 res->hob_feature, res->hob_nsect,
2436 res->hob_lbal, res->hob_lbam, res->hob_lbah,
Tejun Heo5335b722007-07-16 14:29:40 +09002437 res->device, qc->err_mask, ata_err_string(qc->err_mask),
2438 qc->err_mask & AC_ERR_NCQ ? " <F>" : "");
Robert Hancock1333e192007-10-02 11:22:02 -04002439
Robert Hancock65211482009-07-14 20:43:39 -06002440#ifdef CONFIG_ATA_VERBOSE_ERROR
Robert Hancock1333e192007-10-02 11:22:02 -04002441 if (res->command & (ATA_BUSY | ATA_DRDY | ATA_DF | ATA_DRQ |
Jeff Garzik2dcb4072007-10-19 06:42:56 -04002442 ATA_ERR)) {
Robert Hancock1333e192007-10-02 11:22:02 -04002443 if (res->command & ATA_BUSY)
2444 ata_dev_printk(qc->dev, KERN_ERR,
Jeff Garzik2dcb4072007-10-19 06:42:56 -04002445 "status: { Busy }\n");
Robert Hancock1333e192007-10-02 11:22:02 -04002446 else
2447 ata_dev_printk(qc->dev, KERN_ERR,
2448 "status: { %s%s%s%s}\n",
2449 res->command & ATA_DRDY ? "DRDY " : "",
2450 res->command & ATA_DF ? "DF " : "",
2451 res->command & ATA_DRQ ? "DRQ " : "",
Jeff Garzik2dcb4072007-10-19 06:42:56 -04002452 res->command & ATA_ERR ? "ERR " : "");
Robert Hancock1333e192007-10-02 11:22:02 -04002453 }
2454
2455 if (cmd->command != ATA_CMD_PACKET &&
2456 (res->feature & (ATA_ICRC | ATA_UNC | ATA_IDNF |
2457 ATA_ABORTED)))
2458 ata_dev_printk(qc->dev, KERN_ERR,
2459 "error: { %s%s%s%s}\n",
2460 res->feature & ATA_ICRC ? "ICRC " : "",
2461 res->feature & ATA_UNC ? "UNC " : "",
2462 res->feature & ATA_IDNF ? "IDNF " : "",
Jeff Garzik2dcb4072007-10-19 06:42:56 -04002463 res->feature & ATA_ABORTED ? "ABRT " : "");
Robert Hancock65211482009-07-14 20:43:39 -06002464#endif
Tejun Heo022bdb02006-05-15 20:58:22 +09002465 }
2466}
2467
Tejun Heo9b1e2652007-08-06 18:36:24 +09002468/**
2469 * ata_eh_report - report error handling to user
2470 * @ap: ATA port to report EH about
2471 *
2472 * Report EH to user.
2473 *
2474 * LOCKING:
2475 * None.
2476 */
Tejun Heofb7fd612007-09-23 13:14:12 +09002477void ata_eh_report(struct ata_port *ap)
Tejun Heo9b1e2652007-08-06 18:36:24 +09002478{
2479 struct ata_link *link;
2480
Tejun Heo1eca4362008-11-03 20:03:17 +09002481 ata_for_each_link(link, ap, HOST_FIRST)
Tejun Heo9b1e2652007-08-06 18:36:24 +09002482 ata_eh_link_report(link);
2483}
2484
Tejun Heocc0680a2007-08-06 18:36:23 +09002485static int ata_do_reset(struct ata_link *link, ata_reset_fn_t reset,
Tejun Heob1c72912008-07-31 17:02:43 +09002486 unsigned int *classes, unsigned long deadline,
2487 bool clear_classes)
Tejun Heod87fa382006-05-31 18:28:24 +09002488{
Tejun Heof58229f2007-08-06 18:36:23 +09002489 struct ata_device *dev;
Tejun Heod87fa382006-05-31 18:28:24 +09002490
Tejun Heob1c72912008-07-31 17:02:43 +09002491 if (clear_classes)
Tejun Heo1eca4362008-11-03 20:03:17 +09002492 ata_for_each_dev(dev, link, ALL)
Tejun Heob1c72912008-07-31 17:02:43 +09002493 classes[dev->devno] = ATA_DEV_UNKNOWN;
Tejun Heod87fa382006-05-31 18:28:24 +09002494
Tejun Heof0465192008-05-19 01:15:08 +09002495 return reset(link, classes, deadline);
Tejun Heod87fa382006-05-31 18:28:24 +09002496}
2497
Tejun Heoae791c02007-09-23 13:14:12 +09002498static int ata_eh_followup_srst_needed(struct ata_link *link,
Tejun Heo5dbfc9c2008-07-31 16:08:02 +09002499 int rc, const unsigned int *classes)
Tejun Heo664faf02006-05-31 18:27:50 +09002500{
Tejun Heo45db2f62008-04-08 01:46:56 +09002501 if ((link->flags & ATA_LFLAG_NO_SRST) || ata_link_offline(link))
Tejun Heoae791c02007-09-23 13:14:12 +09002502 return 0;
Tejun Heo5dbfc9c2008-07-31 16:08:02 +09002503 if (rc == -EAGAIN)
2504 return 1;
Tejun Heo071f44b2008-04-07 22:47:22 +09002505 if (sata_pmp_supported(link->ap) && ata_is_host_link(link))
Tejun Heo3495de72007-09-23 13:19:53 +09002506 return 1;
Tejun Heo664faf02006-05-31 18:27:50 +09002507 return 0;
2508}
2509
Tejun Heofb7fd612007-09-23 13:14:12 +09002510int ata_eh_reset(struct ata_link *link, int classify,
2511 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
2512 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
Tejun Heo022bdb02006-05-15 20:58:22 +09002513{
Tejun Heoafaa5c32007-10-09 15:06:10 +09002514 struct ata_port *ap = link->ap;
Tejun Heob1c72912008-07-31 17:02:43 +09002515 struct ata_link *slave = ap->slave_link;
Tejun Heo936fd732007-08-06 18:36:23 +09002516 struct ata_eh_context *ehc = &link->eh_context;
Bartlomiej Zolnierkiewicz705d2012009-07-26 16:21:01 +02002517 struct ata_eh_context *sehc = slave ? &slave->eh_context : NULL;
Tejun Heo664faf02006-05-31 18:27:50 +09002518 unsigned int *classes = ehc->classes;
Tejun Heo416dc9e2007-10-31 10:17:03 +09002519 unsigned int lflags = link->flags;
Tejun Heo1cdaf532006-07-03 16:07:26 +09002520 int verbose = !(ehc->i.flags & ATA_EHI_QUIET);
Tejun Heod8af0eb2008-05-20 02:17:53 +09002521 int max_tries = 0, try = 0;
Tejun Heob1c72912008-07-31 17:02:43 +09002522 struct ata_link *failed_link;
Tejun Heof58229f2007-08-06 18:36:23 +09002523 struct ata_device *dev;
Tejun Heo416dc9e2007-10-31 10:17:03 +09002524 unsigned long deadline, now;
Tejun Heo022bdb02006-05-15 20:58:22 +09002525 ata_reset_fn_t reset;
Tejun Heoafaa5c32007-10-09 15:06:10 +09002526 unsigned long flags;
Tejun Heo416dc9e2007-10-31 10:17:03 +09002527 u32 sstatus;
Tejun Heob1c72912008-07-31 17:02:43 +09002528 int nr_unknown, rc;
Tejun Heo022bdb02006-05-15 20:58:22 +09002529
Tejun Heo932648b2008-05-19 01:15:06 +09002530 /*
2531 * Prepare to reset
2532 */
Tejun Heod8af0eb2008-05-20 02:17:53 +09002533 while (ata_eh_reset_timeouts[max_tries] != ULONG_MAX)
2534 max_tries++;
Tejun Heo05944bd2008-08-13 20:19:09 +09002535 if (link->flags & ATA_LFLAG_NO_HRST)
2536 hardreset = NULL;
2537 if (link->flags & ATA_LFLAG_NO_SRST)
2538 softreset = NULL;
Tejun Heod8af0eb2008-05-20 02:17:53 +09002539
Tejun Heo19b72322008-11-04 17:08:40 +09002540 /* make sure each reset attemp is at least COOL_DOWN apart */
2541 if (ehc->i.flags & ATA_EHI_DID_RESET) {
2542 now = jiffies;
2543 WARN_ON(time_after(ehc->last_reset, now));
2544 deadline = ata_deadline(ehc->last_reset,
2545 ATA_EH_RESET_COOL_DOWN);
2546 if (time_before(now, deadline))
2547 schedule_timeout_uninterruptible(deadline - now);
2548 }
Tejun Heo0a2c0f52008-05-20 02:17:52 +09002549
Tejun Heoafaa5c32007-10-09 15:06:10 +09002550 spin_lock_irqsave(ap->lock, flags);
2551 ap->pflags |= ATA_PFLAG_RESETTING;
2552 spin_unlock_irqrestore(ap->lock, flags);
2553
Tejun Heocf480622008-01-24 00:05:14 +09002554 ata_eh_about_to_do(link, NULL, ATA_EH_RESET);
Tejun Heo13abf502006-07-10 23:18:46 +09002555
Tejun Heo1eca4362008-11-03 20:03:17 +09002556 ata_for_each_dev(dev, link, ALL) {
Tejun Heocdeab112007-10-29 16:41:09 +09002557 /* If we issue an SRST then an ATA drive (not ATAPI)
2558 * may change configuration and be in PIO0 timing. If
2559 * we do a hard reset (or are coming from power on)
2560 * this is true for ATA or ATAPI. Until we've set a
2561 * suitable controller mode we should not touch the
2562 * bus as we may be talking too fast.
2563 */
2564 dev->pio_mode = XFER_PIO_0;
2565
2566 /* If the controller has a pio mode setup function
2567 * then use it to set the chipset to rights. Don't
2568 * touch the DMA setup as that will be dealt with when
2569 * configuring devices.
2570 */
2571 if (ap->ops->set_piomode)
2572 ap->ops->set_piomode(ap, dev);
2573 }
2574
Tejun Heocf480622008-01-24 00:05:14 +09002575 /* prefer hardreset */
Tejun Heo932648b2008-05-19 01:15:06 +09002576 reset = NULL;
Tejun Heocf480622008-01-24 00:05:14 +09002577 ehc->i.action &= ~ATA_EH_RESET;
2578 if (hardreset) {
2579 reset = hardreset;
Tejun Heoa6740502008-07-31 16:07:04 +09002580 ehc->i.action |= ATA_EH_HARDRESET;
Tejun Heo4f7faa32008-01-30 18:18:26 +09002581 } else if (softreset) {
Tejun Heocf480622008-01-24 00:05:14 +09002582 reset = softreset;
Tejun Heoa6740502008-07-31 16:07:04 +09002583 ehc->i.action |= ATA_EH_SOFTRESET;
Tejun Heocf480622008-01-24 00:05:14 +09002584 }
Tejun Heof5914a42006-05-31 18:27:48 +09002585
2586 if (prereset) {
Tejun Heob1c72912008-07-31 17:02:43 +09002587 unsigned long deadline = ata_deadline(jiffies,
2588 ATA_EH_PRERESET_TIMEOUT);
2589
2590 if (slave) {
2591 sehc->i.action &= ~ATA_EH_RESET;
2592 sehc->i.action |= ehc->i.action;
2593 }
2594
2595 rc = prereset(link, deadline);
2596
2597 /* If present, do prereset on slave link too. Reset
2598 * is skipped iff both master and slave links report
2599 * -ENOENT or clear ATA_EH_RESET.
2600 */
2601 if (slave && (rc == 0 || rc == -ENOENT)) {
2602 int tmp;
2603
2604 tmp = prereset(slave, deadline);
2605 if (tmp != -ENOENT)
2606 rc = tmp;
2607
2608 ehc->i.action |= sehc->i.action;
2609 }
2610
Tejun Heof5914a42006-05-31 18:27:48 +09002611 if (rc) {
Alan Coxc9619222006-09-26 17:53:38 +01002612 if (rc == -ENOENT) {
Tejun Heocc0680a2007-08-06 18:36:23 +09002613 ata_link_printk(link, KERN_DEBUG,
Tejun Heo4aa9ab62007-03-12 17:24:08 +09002614 "port disabled. ignoring.\n");
Tejun Heocf480622008-01-24 00:05:14 +09002615 ehc->i.action &= ~ATA_EH_RESET;
Tejun Heo4aa9ab62007-03-12 17:24:08 +09002616
Tejun Heo1eca4362008-11-03 20:03:17 +09002617 ata_for_each_dev(dev, link, ALL)
Tejun Heof58229f2007-08-06 18:36:23 +09002618 classes[dev->devno] = ATA_DEV_NONE;
Tejun Heo4aa9ab62007-03-12 17:24:08 +09002619
2620 rc = 0;
Alan Coxc9619222006-09-26 17:53:38 +01002621 } else
Tejun Heocc0680a2007-08-06 18:36:23 +09002622 ata_link_printk(link, KERN_ERR,
Tejun Heof5914a42006-05-31 18:27:48 +09002623 "prereset failed (errno=%d)\n", rc);
Tejun Heofccb6ea2007-07-16 14:29:41 +09002624 goto out;
Tejun Heof5914a42006-05-31 18:27:48 +09002625 }
Tejun Heof5914a42006-05-31 18:27:48 +09002626
Tejun Heo932648b2008-05-19 01:15:06 +09002627 /* prereset() might have cleared ATA_EH_RESET. If so,
Tejun Heod6515e62009-03-04 15:59:30 +09002628 * bang classes, thaw and return.
Tejun Heo932648b2008-05-19 01:15:06 +09002629 */
2630 if (reset && !(ehc->i.action & ATA_EH_RESET)) {
Tejun Heo1eca4362008-11-03 20:03:17 +09002631 ata_for_each_dev(dev, link, ALL)
Tejun Heo932648b2008-05-19 01:15:06 +09002632 classes[dev->devno] = ATA_DEV_NONE;
Tejun Heod6515e62009-03-04 15:59:30 +09002633 if ((ap->pflags & ATA_PFLAG_FROZEN) &&
2634 ata_is_host_link(link))
2635 ata_eh_thaw_port(ap);
Tejun Heo932648b2008-05-19 01:15:06 +09002636 rc = 0;
2637 goto out;
2638 }
Tejun Heof5914a42006-05-31 18:27:48 +09002639 }
2640
Tejun Heo022bdb02006-05-15 20:58:22 +09002641 retry:
Tejun Heo932648b2008-05-19 01:15:06 +09002642 /*
2643 * Perform reset
2644 */
Tejun Heodc98c322008-05-19 01:15:07 +09002645 if (ata_is_host_link(link))
2646 ata_eh_freeze_port(ap);
2647
Tejun Heo341c2c92008-05-20 02:17:51 +09002648 deadline = ata_deadline(jiffies, ata_eh_reset_timeouts[try++]);
Tejun Heo31daabd2007-02-02 16:50:52 +09002649
Tejun Heo932648b2008-05-19 01:15:06 +09002650 if (reset) {
2651 if (verbose)
2652 ata_link_printk(link, KERN_INFO, "%s resetting link\n",
2653 reset == softreset ? "soft" : "hard");
Tejun Heo022bdb02006-05-15 20:58:22 +09002654
Tejun Heo932648b2008-05-19 01:15:06 +09002655 /* mark that this EH session started with reset */
Tejun Heo19b72322008-11-04 17:08:40 +09002656 ehc->last_reset = jiffies;
Tejun Heo932648b2008-05-19 01:15:06 +09002657 if (reset == hardreset)
2658 ehc->i.flags |= ATA_EHI_DID_HARDRESET;
2659 else
2660 ehc->i.flags |= ATA_EHI_DID_SOFTRESET;
Tejun Heo022bdb02006-05-15 20:58:22 +09002661
Tejun Heob1c72912008-07-31 17:02:43 +09002662 rc = ata_do_reset(link, reset, classes, deadline, true);
2663 if (rc && rc != -EAGAIN) {
2664 failed_link = link;
Tejun Heo5dbfc9c2008-07-31 16:08:02 +09002665 goto fail;
Tejun Heob1c72912008-07-31 17:02:43 +09002666 }
Tejun Heo022bdb02006-05-15 20:58:22 +09002667
Tejun Heob1c72912008-07-31 17:02:43 +09002668 /* hardreset slave link if existent */
2669 if (slave && reset == hardreset) {
2670 int tmp;
2671
2672 if (verbose)
2673 ata_link_printk(slave, KERN_INFO,
2674 "hard resetting link\n");
2675
2676 ata_eh_about_to_do(slave, NULL, ATA_EH_RESET);
2677 tmp = ata_do_reset(slave, reset, classes, deadline,
2678 false);
2679 switch (tmp) {
2680 case -EAGAIN:
2681 rc = -EAGAIN;
2682 case 0:
2683 break;
2684 default:
2685 failed_link = slave;
2686 rc = tmp;
2687 goto fail;
2688 }
2689 }
2690
2691 /* perform follow-up SRST if necessary */
Tejun Heo932648b2008-05-19 01:15:06 +09002692 if (reset == hardreset &&
Tejun Heo5dbfc9c2008-07-31 16:08:02 +09002693 ata_eh_followup_srst_needed(link, rc, classes)) {
Tejun Heo932648b2008-05-19 01:15:06 +09002694 reset = softreset;
Tejun Heo664faf02006-05-31 18:27:50 +09002695
Tejun Heo932648b2008-05-19 01:15:06 +09002696 if (!reset) {
2697 ata_link_printk(link, KERN_ERR,
2698 "follow-up softreset required "
2699 "but no softreset avaliable\n");
Tejun Heob1c72912008-07-31 17:02:43 +09002700 failed_link = link;
Tejun Heo932648b2008-05-19 01:15:06 +09002701 rc = -EINVAL;
2702 goto fail;
2703 }
2704
2705 ata_eh_about_to_do(link, NULL, ATA_EH_RESET);
Tejun Heob1c72912008-07-31 17:02:43 +09002706 rc = ata_do_reset(link, reset, classes, deadline, true);
Tejun Heofe2c4d02009-07-08 12:16:37 +09002707 if (rc) {
2708 failed_link = link;
2709 goto fail;
2710 }
Tejun Heo664faf02006-05-31 18:27:50 +09002711 }
Tejun Heo932648b2008-05-19 01:15:06 +09002712 } else {
2713 if (verbose)
2714 ata_link_printk(link, KERN_INFO, "no reset method "
2715 "available, skipping reset\n");
2716 if (!(lflags & ATA_LFLAG_ASSUME_CLASS))
2717 lflags |= ATA_LFLAG_ASSUME_ATA;
Tejun Heo664faf02006-05-31 18:27:50 +09002718 }
2719
Tejun Heo932648b2008-05-19 01:15:06 +09002720 /*
2721 * Post-reset processing
2722 */
Tejun Heo1eca4362008-11-03 20:03:17 +09002723 ata_for_each_dev(dev, link, ALL) {
Tejun Heo416dc9e2007-10-31 10:17:03 +09002724 /* After the reset, the device state is PIO 0 and the
2725 * controller state is undefined. Reset also wakes up
2726 * drives from sleeping mode.
2727 */
2728 dev->pio_mode = XFER_PIO_0;
2729 dev->flags &= ~ATA_DFLAG_SLEEPING;
Tejun Heo664faf02006-05-31 18:27:50 +09002730
Tejun Heo3b761d32009-10-06 17:08:40 +09002731 if (ata_phys_link_offline(ata_dev_phys_link(dev)))
2732 continue;
2733
2734 /* apply class override */
2735 if (lflags & ATA_LFLAG_ASSUME_ATA)
2736 classes[dev->devno] = ATA_DEV_ATA;
2737 else if (lflags & ATA_LFLAG_ASSUME_SEMB)
2738 classes[dev->devno] = ATA_DEV_SEMB_UNSUP;
Tejun Heo022bdb02006-05-15 20:58:22 +09002739 }
2740
Tejun Heo416dc9e2007-10-31 10:17:03 +09002741 /* record current link speed */
2742 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0)
2743 link->sata_spd = (sstatus >> 4) & 0xf;
Tejun Heob1c72912008-07-31 17:02:43 +09002744 if (slave && sata_scr_read(slave, SCR_STATUS, &sstatus) == 0)
2745 slave->sata_spd = (sstatus >> 4) & 0xf;
Tejun Heo008a7892007-07-16 14:29:40 +09002746
Tejun Heodc98c322008-05-19 01:15:07 +09002747 /* thaw the port */
2748 if (ata_is_host_link(link))
2749 ata_eh_thaw_port(ap);
2750
Tejun Heof0465192008-05-19 01:15:08 +09002751 /* postreset() should clear hardware SError. Although SError
2752 * is cleared during link resume, clearing SError here is
2753 * necessary as some PHYs raise hotplug events after SRST.
2754 * This introduces race condition where hotplug occurs between
2755 * reset and here. This race is mediated by cross checking
2756 * link onlineness and classification result later.
2757 */
Tejun Heob1c72912008-07-31 17:02:43 +09002758 if (postreset) {
Tejun Heo416dc9e2007-10-31 10:17:03 +09002759 postreset(link, classes);
Tejun Heob1c72912008-07-31 17:02:43 +09002760 if (slave)
2761 postreset(slave, classes);
2762 }
Tejun Heo20952b62006-05-31 18:27:23 +09002763
Tejun Heo1e641062009-07-17 11:58:33 +09002764 /*
2765 * Some controllers can't be frozen very well and may set
2766 * spuruious error conditions during reset. Clear accumulated
2767 * error information. As reset is the final recovery action,
2768 * nothing is lost by doing this.
2769 */
Tejun Heof0465192008-05-19 01:15:08 +09002770 spin_lock_irqsave(link->ap->lock, flags);
Tejun Heo1e641062009-07-17 11:58:33 +09002771 memset(&link->eh_info, 0, sizeof(link->eh_info));
Tejun Heob1c72912008-07-31 17:02:43 +09002772 if (slave)
Tejun Heo1e641062009-07-17 11:58:33 +09002773 memset(&slave->eh_info, 0, sizeof(link->eh_info));
2774 ap->pflags &= ~ATA_PFLAG_EH_PENDING;
Tejun Heof0465192008-05-19 01:15:08 +09002775 spin_unlock_irqrestore(link->ap->lock, flags);
2776
Tejun Heo3b761d32009-10-06 17:08:40 +09002777 /*
2778 * Make sure onlineness and classification result correspond.
Tejun Heof0465192008-05-19 01:15:08 +09002779 * Hotplug could have happened during reset and some
2780 * controllers fail to wait while a drive is spinning up after
2781 * being hotplugged causing misdetection. By cross checking
Tejun Heo3b761d32009-10-06 17:08:40 +09002782 * link on/offlineness and classification result, those
2783 * conditions can be reliably detected and retried.
Tejun Heof0465192008-05-19 01:15:08 +09002784 */
Tejun Heob1c72912008-07-31 17:02:43 +09002785 nr_unknown = 0;
Tejun Heo1eca4362008-11-03 20:03:17 +09002786 ata_for_each_dev(dev, link, ALL) {
Tejun Heo3b761d32009-10-06 17:08:40 +09002787 if (ata_phys_link_online(ata_dev_phys_link(dev))) {
2788 if (classes[dev->devno] == ATA_DEV_UNKNOWN) {
2789 ata_dev_printk(dev, KERN_DEBUG, "link online "
2790 "but device misclassifed\n");
2791 classes[dev->devno] = ATA_DEV_NONE;
Tejun Heob1c72912008-07-31 17:02:43 +09002792 nr_unknown++;
Tejun Heo3b761d32009-10-06 17:08:40 +09002793 }
2794 } else if (ata_phys_link_offline(ata_dev_phys_link(dev))) {
2795 if (ata_class_enabled(classes[dev->devno]))
2796 ata_dev_printk(dev, KERN_DEBUG, "link offline, "
2797 "clearing class %d to NONE\n",
2798 classes[dev->devno]);
2799 classes[dev->devno] = ATA_DEV_NONE;
2800 } else if (classes[dev->devno] == ATA_DEV_UNKNOWN) {
2801 ata_dev_printk(dev, KERN_DEBUG, "link status unknown, "
2802 "clearing UNKNOWN to NONE\n");
2803 classes[dev->devno] = ATA_DEV_NONE;
Tejun Heob1c72912008-07-31 17:02:43 +09002804 }
Tejun Heof0465192008-05-19 01:15:08 +09002805 }
2806
Tejun Heob1c72912008-07-31 17:02:43 +09002807 if (classify && nr_unknown) {
Tejun Heof0465192008-05-19 01:15:08 +09002808 if (try < max_tries) {
2809 ata_link_printk(link, KERN_WARNING, "link online but "
Tejun Heo3b761d32009-10-06 17:08:40 +09002810 "%d devices misclassified, retrying\n",
2811 nr_unknown);
Tejun Heob1c72912008-07-31 17:02:43 +09002812 failed_link = link;
Tejun Heof0465192008-05-19 01:15:08 +09002813 rc = -EAGAIN;
2814 goto fail;
2815 }
2816 ata_link_printk(link, KERN_WARNING,
Tejun Heo3b761d32009-10-06 17:08:40 +09002817 "link online but %d devices misclassified, "
2818 "device detection might fail\n", nr_unknown);
Tejun Heof0465192008-05-19 01:15:08 +09002819 }
2820
Tejun Heo416dc9e2007-10-31 10:17:03 +09002821 /* reset successful, schedule revalidation */
Tejun Heocf480622008-01-24 00:05:14 +09002822 ata_eh_done(link, NULL, ATA_EH_RESET);
Tejun Heob1c72912008-07-31 17:02:43 +09002823 if (slave)
2824 ata_eh_done(slave, NULL, ATA_EH_RESET);
Tejun Heo6b7ae952010-09-01 17:50:06 +02002825 ehc->last_reset = jiffies; /* update to completion time */
Tejun Heo416dc9e2007-10-31 10:17:03 +09002826 ehc->i.action |= ATA_EH_REVALIDATE;
Tejun Heo6b7ae952010-09-01 17:50:06 +02002827 link->lpm_policy = ATA_LPM_UNKNOWN; /* reset LPM state */
Tejun Heoae791c02007-09-23 13:14:12 +09002828
Tejun Heo416dc9e2007-10-31 10:17:03 +09002829 rc = 0;
Tejun Heofccb6ea2007-07-16 14:29:41 +09002830 out:
2831 /* clear hotplug flag */
2832 ehc->i.flags &= ~ATA_EHI_HOTPLUGGED;
Tejun Heob1c72912008-07-31 17:02:43 +09002833 if (slave)
2834 sehc->i.flags &= ~ATA_EHI_HOTPLUGGED;
Tejun Heoafaa5c32007-10-09 15:06:10 +09002835
2836 spin_lock_irqsave(ap->lock, flags);
2837 ap->pflags &= ~ATA_PFLAG_RESETTING;
2838 spin_unlock_irqrestore(ap->lock, flags);
2839
Tejun Heo022bdb02006-05-15 20:58:22 +09002840 return rc;
Tejun Heo416dc9e2007-10-31 10:17:03 +09002841
2842 fail:
Tejun Heo5958e302008-04-07 22:47:20 +09002843 /* if SCR isn't accessible on a fan-out port, PMP needs to be reset */
2844 if (!ata_is_host_link(link) &&
2845 sata_scr_read(link, SCR_STATUS, &sstatus))
2846 rc = -ERESTART;
2847
Tejun Heo416dc9e2007-10-31 10:17:03 +09002848 if (rc == -ERESTART || try >= max_tries)
2849 goto out;
2850
2851 now = jiffies;
2852 if (time_before(now, deadline)) {
2853 unsigned long delta = deadline - now;
2854
Tejun Heob1c72912008-07-31 17:02:43 +09002855 ata_link_printk(failed_link, KERN_WARNING,
Tejun Heo0a2c0f52008-05-20 02:17:52 +09002856 "reset failed (errno=%d), retrying in %u secs\n",
2857 rc, DIV_ROUND_UP(jiffies_to_msecs(delta), 1000));
Tejun Heo416dc9e2007-10-31 10:17:03 +09002858
Tejun Heoc0c362b2010-09-06 17:57:14 +02002859 ata_eh_release(ap);
Tejun Heo416dc9e2007-10-31 10:17:03 +09002860 while (delta)
2861 delta = schedule_timeout_uninterruptible(delta);
Tejun Heoc0c362b2010-09-06 17:57:14 +02002862 ata_eh_acquire(ap);
Tejun Heo416dc9e2007-10-31 10:17:03 +09002863 }
2864
Tejun Heob1c72912008-07-31 17:02:43 +09002865 if (try == max_tries - 1) {
Tejun Heoa07d4992009-01-29 20:31:33 +09002866 sata_down_spd_limit(link, 0);
Tejun Heob1c72912008-07-31 17:02:43 +09002867 if (slave)
Tejun Heoa07d4992009-01-29 20:31:33 +09002868 sata_down_spd_limit(slave, 0);
Tejun Heob1c72912008-07-31 17:02:43 +09002869 } else if (rc == -EPIPE)
Tejun Heoa07d4992009-01-29 20:31:33 +09002870 sata_down_spd_limit(failed_link, 0);
Tejun Heob1c72912008-07-31 17:02:43 +09002871
Tejun Heo416dc9e2007-10-31 10:17:03 +09002872 if (hardreset)
2873 reset = hardreset;
2874 goto retry;
Tejun Heo022bdb02006-05-15 20:58:22 +09002875}
2876
Elias Oltmanns45fabbb2008-09-21 11:54:08 +02002877static inline void ata_eh_pull_park_action(struct ata_port *ap)
2878{
2879 struct ata_link *link;
2880 struct ata_device *dev;
2881 unsigned long flags;
2882
2883 /*
2884 * This function can be thought of as an extended version of
2885 * ata_eh_about_to_do() specially crafted to accommodate the
2886 * requirements of ATA_EH_PARK handling. Since the EH thread
2887 * does not leave the do {} while () loop in ata_eh_recover as
2888 * long as the timeout for a park request to *one* device on
2889 * the port has not expired, and since we still want to pick
2890 * up park requests to other devices on the same port or
2891 * timeout updates for the same device, we have to pull
2892 * ATA_EH_PARK actions from eh_info into eh_context.i
2893 * ourselves at the beginning of each pass over the loop.
2894 *
2895 * Additionally, all write accesses to &ap->park_req_pending
2896 * through INIT_COMPLETION() (see below) or complete_all()
2897 * (see ata_scsi_park_store()) are protected by the host lock.
2898 * As a result we have that park_req_pending.done is zero on
2899 * exit from this function, i.e. when ATA_EH_PARK actions for
2900 * *all* devices on port ap have been pulled into the
2901 * respective eh_context structs. If, and only if,
2902 * park_req_pending.done is non-zero by the time we reach
2903 * wait_for_completion_timeout(), another ATA_EH_PARK action
2904 * has been scheduled for at least one of the devices on port
2905 * ap and we have to cycle over the do {} while () loop in
2906 * ata_eh_recover() again.
2907 */
2908
2909 spin_lock_irqsave(ap->lock, flags);
2910 INIT_COMPLETION(ap->park_req_pending);
Tejun Heo1eca4362008-11-03 20:03:17 +09002911 ata_for_each_link(link, ap, EDGE) {
2912 ata_for_each_dev(dev, link, ALL) {
Elias Oltmanns45fabbb2008-09-21 11:54:08 +02002913 struct ata_eh_info *ehi = &link->eh_info;
2914
2915 link->eh_context.i.dev_action[dev->devno] |=
2916 ehi->dev_action[dev->devno] & ATA_EH_PARK;
2917 ata_eh_clear_action(link, dev, ehi, ATA_EH_PARK);
2918 }
2919 }
2920 spin_unlock_irqrestore(ap->lock, flags);
2921}
2922
2923static void ata_eh_park_issue_cmd(struct ata_device *dev, int park)
2924{
2925 struct ata_eh_context *ehc = &dev->link->eh_context;
2926 struct ata_taskfile tf;
2927 unsigned int err_mask;
2928
2929 ata_tf_init(dev, &tf);
2930 if (park) {
2931 ehc->unloaded_mask |= 1 << dev->devno;
2932 tf.command = ATA_CMD_IDLEIMMEDIATE;
2933 tf.feature = 0x44;
2934 tf.lbal = 0x4c;
2935 tf.lbam = 0x4e;
2936 tf.lbah = 0x55;
2937 } else {
2938 ehc->unloaded_mask &= ~(1 << dev->devno);
2939 tf.command = ATA_CMD_CHK_POWER;
2940 }
2941
2942 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
2943 tf.protocol |= ATA_PROT_NODATA;
2944 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
2945 if (park && (err_mask || tf.lbal != 0xc4)) {
2946 ata_dev_printk(dev, KERN_ERR, "head unload failed!\n");
2947 ehc->unloaded_mask &= ~(1 << dev->devno);
2948 }
2949}
2950
Tejun Heo02607312007-08-06 18:36:23 +09002951static int ata_eh_revalidate_and_attach(struct ata_link *link,
Tejun Heo084fe632006-05-31 18:28:03 +09002952 struct ata_device **r_failed_dev)
Tejun Heo022bdb02006-05-15 20:58:22 +09002953{
Tejun Heo02607312007-08-06 18:36:23 +09002954 struct ata_port *ap = link->ap;
2955 struct ata_eh_context *ehc = &link->eh_context;
Tejun Heo022bdb02006-05-15 20:58:22 +09002956 struct ata_device *dev;
Tejun Heo8c3c52a2007-03-22 22:24:19 +09002957 unsigned int new_mask = 0;
Tejun Heo084fe632006-05-31 18:28:03 +09002958 unsigned long flags;
Tejun Heof58229f2007-08-06 18:36:23 +09002959 int rc = 0;
Tejun Heo022bdb02006-05-15 20:58:22 +09002960
2961 DPRINTK("ENTER\n");
2962
Tejun Heo8c3c52a2007-03-22 22:24:19 +09002963 /* For PATA drive side cable detection to work, IDENTIFY must
2964 * be done backwards such that PDIAG- is released by the slave
2965 * device before the master device is identified.
2966 */
Tejun Heo1eca4362008-11-03 20:03:17 +09002967 ata_for_each_dev(dev, link, ALL_REVERSE) {
Tejun Heof58229f2007-08-06 18:36:23 +09002968 unsigned int action = ata_eh_dev_action(dev);
2969 unsigned int readid_flags = 0;
Tejun Heo47005f22006-06-19 18:27:23 +09002970
Tejun Heobff04642006-11-10 18:08:10 +09002971 if (ehc->i.flags & ATA_EHI_DID_RESET)
2972 readid_flags |= ATA_READID_POSTRESET;
2973
Tejun Heo9666f402007-05-04 21:27:47 +02002974 if ((action & ATA_EH_REVALIDATE) && ata_dev_enabled(dev)) {
Tejun Heo633273a2007-09-23 13:19:54 +09002975 WARN_ON(dev->class == ATA_DEV_PMP);
2976
Tejun Heob1c72912008-07-31 17:02:43 +09002977 if (ata_phys_link_offline(ata_dev_phys_link(dev))) {
Tejun Heo022bdb02006-05-15 20:58:22 +09002978 rc = -EIO;
Tejun Heo8c3c52a2007-03-22 22:24:19 +09002979 goto err;
Tejun Heo022bdb02006-05-15 20:58:22 +09002980 }
2981
Tejun Heo02607312007-08-06 18:36:23 +09002982 ata_eh_about_to_do(link, dev, ATA_EH_REVALIDATE);
Tejun Heo422c9da2007-09-23 13:14:12 +09002983 rc = ata_dev_revalidate(dev, ehc->classes[dev->devno],
2984 readid_flags);
Tejun Heo022bdb02006-05-15 20:58:22 +09002985 if (rc)
Tejun Heo8c3c52a2007-03-22 22:24:19 +09002986 goto err;
Tejun Heo022bdb02006-05-15 20:58:22 +09002987
Tejun Heo02607312007-08-06 18:36:23 +09002988 ata_eh_done(link, dev, ATA_EH_REVALIDATE);
Tejun Heo47005f22006-06-19 18:27:23 +09002989
Tejun Heobaa1e782006-11-01 18:39:27 +09002990 /* Configuration may have changed, reconfigure
2991 * transfer mode.
2992 */
2993 ehc->i.flags |= ATA_EHI_SETMODE;
2994
zhao, forrest3057ac32006-06-12 12:01:34 +08002995 /* schedule the scsi_rescan_device() here */
Tejun Heoad72cf92010-07-02 10:03:52 +02002996 schedule_work(&(ap->scsi_rescan_task));
Tejun Heo084fe632006-05-31 18:28:03 +09002997 } else if (dev->class == ATA_DEV_UNKNOWN &&
2998 ehc->tries[dev->devno] &&
2999 ata_class_enabled(ehc->classes[dev->devno])) {
Tejun Heo842faa62009-05-10 01:06:54 +09003000 /* Temporarily set dev->class, it will be
3001 * permanently set once all configurations are
3002 * complete. This is necessary because new
3003 * device configuration is done in two
3004 * separate loops.
3005 */
Tejun Heo084fe632006-05-31 18:28:03 +09003006 dev->class = ehc->classes[dev->devno];
3007
Tejun Heo633273a2007-09-23 13:19:54 +09003008 if (dev->class == ATA_DEV_PMP)
3009 rc = sata_pmp_attach(dev);
3010 else
3011 rc = ata_dev_read_id(dev, &dev->class,
3012 readid_flags, dev->id);
Tejun Heo842faa62009-05-10 01:06:54 +09003013
3014 /* read_id might have changed class, store and reset */
3015 ehc->classes[dev->devno] = dev->class;
3016 dev->class = ATA_DEV_UNKNOWN;
3017
Tejun Heo8c3c52a2007-03-22 22:24:19 +09003018 switch (rc) {
3019 case 0:
Tejun Heo99cf6102009-01-29 20:31:32 +09003020 /* clear error info accumulated during probe */
3021 ata_ering_clear(&dev->ering);
Tejun Heof58229f2007-08-06 18:36:23 +09003022 new_mask |= 1 << dev->devno;
Tejun Heo8c3c52a2007-03-22 22:24:19 +09003023 break;
3024 case -ENOENT:
Tejun Heo55a8e2c2006-11-10 18:08:10 +09003025 /* IDENTIFY was issued to non-existent
3026 * device. No need to reset. Just
Tejun Heo842faa62009-05-10 01:06:54 +09003027 * thaw and ignore the device.
Tejun Heo55a8e2c2006-11-10 18:08:10 +09003028 */
3029 ata_eh_thaw_port(ap);
Tejun Heo084fe632006-05-31 18:28:03 +09003030 break;
Tejun Heo8c3c52a2007-03-22 22:24:19 +09003031 default:
Tejun Heo8c3c52a2007-03-22 22:24:19 +09003032 goto err;
Tejun Heo55a8e2c2006-11-10 18:08:10 +09003033 }
Tejun Heo022bdb02006-05-15 20:58:22 +09003034 }
3035 }
3036
Tejun Heoc1c4e8d2007-04-23 02:05:53 +09003037 /* PDIAG- should have been released, ask cable type if post-reset */
Tejun Heo33267322008-02-13 09:15:09 +09003038 if ((ehc->i.flags & ATA_EHI_DID_RESET) && ata_is_host_link(link)) {
3039 if (ap->ops->cable_detect)
3040 ap->cbl = ap->ops->cable_detect(ap);
3041 ata_force_cbl(ap);
3042 }
Tejun Heoc1c4e8d2007-04-23 02:05:53 +09003043
Tejun Heo8c3c52a2007-03-22 22:24:19 +09003044 /* Configure new devices forward such that user doesn't see
3045 * device detection messages backwards.
3046 */
Tejun Heo1eca4362008-11-03 20:03:17 +09003047 ata_for_each_dev(dev, link, ALL) {
Tejun Heo4f7c2872009-10-15 23:37:32 +09003048 if (!(new_mask & (1 << dev->devno)))
Tejun Heo8c3c52a2007-03-22 22:24:19 +09003049 continue;
3050
Tejun Heo842faa62009-05-10 01:06:54 +09003051 dev->class = ehc->classes[dev->devno];
3052
Tejun Heo4f7c2872009-10-15 23:37:32 +09003053 if (dev->class == ATA_DEV_PMP)
3054 continue;
3055
Tejun Heo8c3c52a2007-03-22 22:24:19 +09003056 ehc->i.flags |= ATA_EHI_PRINTINFO;
3057 rc = ata_dev_configure(dev);
3058 ehc->i.flags &= ~ATA_EHI_PRINTINFO;
Tejun Heo842faa62009-05-10 01:06:54 +09003059 if (rc) {
3060 dev->class = ATA_DEV_UNKNOWN;
Tejun Heo8c3c52a2007-03-22 22:24:19 +09003061 goto err;
Tejun Heo842faa62009-05-10 01:06:54 +09003062 }
Tejun Heo8c3c52a2007-03-22 22:24:19 +09003063
3064 spin_lock_irqsave(ap->lock, flags);
3065 ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG;
3066 spin_unlock_irqrestore(ap->lock, flags);
3067
3068 /* new device discovered, configure xfermode */
3069 ehc->i.flags |= ATA_EHI_SETMODE;
3070 }
3071
3072 return 0;
3073
3074 err:
3075 *r_failed_dev = dev;
3076 DPRINTK("EXIT rc=%d\n", rc);
Tejun Heo022bdb02006-05-15 20:58:22 +09003077 return rc;
3078}
3079
Tejun Heo6f1d1e32007-11-27 19:28:55 +09003080/**
3081 * ata_set_mode - Program timings and issue SET FEATURES - XFER
3082 * @link: link on which timings will be programmed
Martin Olsson98a17082009-04-22 18:21:29 +02003083 * @r_failed_dev: out parameter for failed device
Tejun Heo6f1d1e32007-11-27 19:28:55 +09003084 *
3085 * Set ATA device disk transfer mode (PIO3, UDMA6, etc.). If
3086 * ata_set_mode() fails, pointer to the failing device is
3087 * returned in @r_failed_dev.
3088 *
3089 * LOCKING:
3090 * PCI/etc. bus probe sem.
3091 *
3092 * RETURNS:
3093 * 0 on success, negative errno otherwise
3094 */
3095int ata_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3096{
3097 struct ata_port *ap = link->ap;
Tejun Heo00115e02007-11-27 19:28:58 +09003098 struct ata_device *dev;
3099 int rc;
Tejun Heo6f1d1e32007-11-27 19:28:55 +09003100
Tejun Heo76326ac2007-11-27 19:28:59 +09003101 /* if data transfer is verified, clear DUBIOUS_XFER on ering top */
Tejun Heo1eca4362008-11-03 20:03:17 +09003102 ata_for_each_dev(dev, link, ENABLED) {
Tejun Heo76326ac2007-11-27 19:28:59 +09003103 if (!(dev->flags & ATA_DFLAG_DUBIOUS_XFER)) {
3104 struct ata_ering_entry *ent;
3105
3106 ent = ata_ering_top(&dev->ering);
3107 if (ent)
3108 ent->eflags &= ~ATA_EFLAG_DUBIOUS_XFER;
3109 }
3110 }
3111
Tejun Heo6f1d1e32007-11-27 19:28:55 +09003112 /* has private set_mode? */
3113 if (ap->ops->set_mode)
Tejun Heo00115e02007-11-27 19:28:58 +09003114 rc = ap->ops->set_mode(link, r_failed_dev);
3115 else
3116 rc = ata_do_set_mode(link, r_failed_dev);
3117
3118 /* if transfer mode has changed, set DUBIOUS_XFER on device */
Tejun Heo1eca4362008-11-03 20:03:17 +09003119 ata_for_each_dev(dev, link, ENABLED) {
Tejun Heo00115e02007-11-27 19:28:58 +09003120 struct ata_eh_context *ehc = &link->eh_context;
3121 u8 saved_xfer_mode = ehc->saved_xfer_mode[dev->devno];
3122 u8 saved_ncq = !!(ehc->saved_ncq_enabled & (1 << dev->devno));
3123
3124 if (dev->xfer_mode != saved_xfer_mode ||
3125 ata_ncq_enabled(dev) != saved_ncq)
3126 dev->flags |= ATA_DFLAG_DUBIOUS_XFER;
3127 }
3128
3129 return rc;
Tejun Heo6f1d1e32007-11-27 19:28:55 +09003130}
3131
Tejun Heo11fc33d2008-08-30 14:20:01 +02003132/**
3133 * atapi_eh_clear_ua - Clear ATAPI UNIT ATTENTION after reset
3134 * @dev: ATAPI device to clear UA for
3135 *
3136 * Resets and other operations can make an ATAPI device raise
3137 * UNIT ATTENTION which causes the next operation to fail. This
3138 * function clears UA.
3139 *
3140 * LOCKING:
3141 * EH context (may sleep).
3142 *
3143 * RETURNS:
3144 * 0 on success, -errno on failure.
3145 */
3146static int atapi_eh_clear_ua(struct ata_device *dev)
3147{
3148 int i;
3149
3150 for (i = 0; i < ATA_EH_UA_TRIES; i++) {
Tejun Heob5357082009-03-02 18:55:16 +09003151 u8 *sense_buffer = dev->link->ap->sector_buf;
Tejun Heo11fc33d2008-08-30 14:20:01 +02003152 u8 sense_key = 0;
3153 unsigned int err_mask;
3154
3155 err_mask = atapi_eh_tur(dev, &sense_key);
3156 if (err_mask != 0 && err_mask != AC_ERR_DEV) {
3157 ata_dev_printk(dev, KERN_WARNING, "TEST_UNIT_READY "
3158 "failed (err_mask=0x%x)\n", err_mask);
3159 return -EIO;
3160 }
3161
3162 if (!err_mask || sense_key != UNIT_ATTENTION)
3163 return 0;
3164
3165 err_mask = atapi_eh_request_sense(dev, sense_buffer, sense_key);
3166 if (err_mask) {
3167 ata_dev_printk(dev, KERN_WARNING, "failed to clear "
3168 "UNIT ATTENTION (err_mask=0x%x)\n", err_mask);
3169 return -EIO;
3170 }
3171 }
3172
3173 ata_dev_printk(dev, KERN_WARNING,
3174 "UNIT ATTENTION persists after %d tries\n", ATA_EH_UA_TRIES);
3175
3176 return 0;
3177}
3178
Tejun Heo6013efd2009-11-19 15:36:45 +09003179/**
3180 * ata_eh_maybe_retry_flush - Retry FLUSH if necessary
3181 * @dev: ATA device which may need FLUSH retry
3182 *
3183 * If @dev failed FLUSH, it needs to be reported upper layer
3184 * immediately as it means that @dev failed to remap and already
3185 * lost at least a sector and further FLUSH retrials won't make
3186 * any difference to the lost sector. However, if FLUSH failed
3187 * for other reasons, for example transmission error, FLUSH needs
3188 * to be retried.
3189 *
3190 * This function determines whether FLUSH failure retry is
3191 * necessary and performs it if so.
3192 *
3193 * RETURNS:
3194 * 0 if EH can continue, -errno if EH needs to be repeated.
3195 */
3196static int ata_eh_maybe_retry_flush(struct ata_device *dev)
3197{
3198 struct ata_link *link = dev->link;
3199 struct ata_port *ap = link->ap;
3200 struct ata_queued_cmd *qc;
3201 struct ata_taskfile tf;
3202 unsigned int err_mask;
3203 int rc = 0;
3204
3205 /* did flush fail for this device? */
3206 if (!ata_tag_valid(link->active_tag))
3207 return 0;
3208
3209 qc = __ata_qc_from_tag(ap, link->active_tag);
3210 if (qc->dev != dev || (qc->tf.command != ATA_CMD_FLUSH_EXT &&
3211 qc->tf.command != ATA_CMD_FLUSH))
3212 return 0;
3213
3214 /* if the device failed it, it should be reported to upper layers */
3215 if (qc->err_mask & AC_ERR_DEV)
3216 return 0;
3217
3218 /* flush failed for some other reason, give it another shot */
3219 ata_tf_init(dev, &tf);
3220
3221 tf.command = qc->tf.command;
3222 tf.flags |= ATA_TFLAG_DEVICE;
3223 tf.protocol = ATA_PROT_NODATA;
3224
3225 ata_dev_printk(dev, KERN_WARNING, "retrying FLUSH 0x%x Emask 0x%x\n",
3226 tf.command, qc->err_mask);
3227
3228 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
3229 if (!err_mask) {
3230 /*
3231 * FLUSH is complete but there's no way to
3232 * successfully complete a failed command from EH.
3233 * Making sure retry is allowed at least once and
3234 * retrying it should do the trick - whatever was in
3235 * the cache is already on the platter and this won't
3236 * cause infinite loop.
3237 */
3238 qc->scsicmd->allowed = max(qc->scsicmd->allowed, 1);
3239 } else {
3240 ata_dev_printk(dev, KERN_WARNING, "FLUSH failed Emask 0x%x\n",
3241 err_mask);
3242 rc = -EIO;
3243
3244 /* if device failed it, report it to upper layers */
3245 if (err_mask & AC_ERR_DEV) {
3246 qc->err_mask |= AC_ERR_DEV;
3247 qc->result_tf = tf;
3248 if (!(ap->pflags & ATA_PFLAG_FROZEN))
3249 rc = 0;
3250 }
3251 }
3252 return rc;
3253}
3254
Tejun Heo6b7ae952010-09-01 17:50:06 +02003255/**
3256 * ata_eh_set_lpm - configure SATA interface power management
3257 * @link: link to configure power management
3258 * @policy: the link power management policy
3259 * @r_failed_dev: out parameter for failed device
3260 *
3261 * Enable SATA Interface power management. This will enable
3262 * Device Interface Power Management (DIPM) for min_power
3263 * policy, and then call driver specific callbacks for
3264 * enabling Host Initiated Power management.
3265 *
3266 * LOCKING:
3267 * EH context.
3268 *
3269 * RETURNS:
3270 * 0 on success, -errno on failure.
3271 */
3272static int ata_eh_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
3273 struct ata_device **r_failed_dev)
3274{
Tejun Heo6c8ea892010-09-01 17:50:07 +02003275 struct ata_port *ap = ata_is_host_link(link) ? link->ap : NULL;
Tejun Heo6b7ae952010-09-01 17:50:06 +02003276 struct ata_eh_context *ehc = &link->eh_context;
3277 struct ata_device *dev, *link_dev = NULL, *lpm_dev = NULL;
Tejun Heoe5005b12010-12-09 16:13:15 +01003278 enum ata_lpm_policy old_policy = link->lpm_policy;
Tejun Heo6b7ae952010-09-01 17:50:06 +02003279 unsigned int hints = ATA_LPM_EMPTY | ATA_LPM_HIPM;
3280 unsigned int err_mask;
3281 int rc;
3282
3283 /* if the link or host doesn't do LPM, noop */
3284 if ((link->flags & ATA_LFLAG_NO_LPM) || (ap && !ap->ops->set_lpm))
3285 return 0;
3286
3287 /*
3288 * DIPM is enabled only for MIN_POWER as some devices
3289 * misbehave when the host NACKs transition to SLUMBER. Order
3290 * device and link configurations such that the host always
3291 * allows DIPM requests.
3292 */
3293 ata_for_each_dev(dev, link, ENABLED) {
3294 bool hipm = ata_id_has_hipm(dev->id);
3295 bool dipm = ata_id_has_dipm(dev->id);
3296
3297 /* find the first enabled and LPM enabled devices */
3298 if (!link_dev)
3299 link_dev = dev;
3300
3301 if (!lpm_dev && (hipm || dipm))
3302 lpm_dev = dev;
3303
3304 hints &= ~ATA_LPM_EMPTY;
3305 if (!hipm)
3306 hints &= ~ATA_LPM_HIPM;
3307
3308 /* disable DIPM before changing link config */
3309 if (policy != ATA_LPM_MIN_POWER && dipm) {
3310 err_mask = ata_dev_set_feature(dev,
3311 SETFEATURES_SATA_DISABLE, SATA_DIPM);
3312 if (err_mask && err_mask != AC_ERR_DEV) {
3313 ata_dev_printk(dev, KERN_WARNING,
3314 "failed to disable DIPM, Emask 0x%x\n",
3315 err_mask);
3316 rc = -EIO;
3317 goto fail;
3318 }
3319 }
3320 }
3321
Tejun Heo6c8ea892010-09-01 17:50:07 +02003322 if (ap) {
3323 rc = ap->ops->set_lpm(link, policy, hints);
3324 if (!rc && ap->slave_link)
3325 rc = ap->ops->set_lpm(ap->slave_link, policy, hints);
3326 } else
3327 rc = sata_pmp_set_lpm(link, policy, hints);
Tejun Heo6b7ae952010-09-01 17:50:06 +02003328
3329 /*
3330 * Attribute link config failure to the first (LPM) enabled
3331 * device on the link.
3332 */
3333 if (rc) {
3334 if (rc == -EOPNOTSUPP) {
3335 link->flags |= ATA_LFLAG_NO_LPM;
3336 return 0;
3337 }
3338 dev = lpm_dev ? lpm_dev : link_dev;
3339 goto fail;
3340 }
3341
Tejun Heoe5005b12010-12-09 16:13:15 +01003342 /*
3343 * Low level driver acked the transition. Issue DIPM command
3344 * with the new policy set.
3345 */
3346 link->lpm_policy = policy;
3347 if (ap && ap->slave_link)
3348 ap->slave_link->lpm_policy = policy;
3349
Tejun Heo6b7ae952010-09-01 17:50:06 +02003350 /* host config updated, enable DIPM if transitioning to MIN_POWER */
3351 ata_for_each_dev(dev, link, ENABLED) {
3352 if (policy == ATA_LPM_MIN_POWER && ata_id_has_dipm(dev->id)) {
3353 err_mask = ata_dev_set_feature(dev,
3354 SETFEATURES_SATA_ENABLE, SATA_DIPM);
3355 if (err_mask && err_mask != AC_ERR_DEV) {
3356 ata_dev_printk(dev, KERN_WARNING,
3357 "failed to enable DIPM, Emask 0x%x\n",
3358 err_mask);
3359 rc = -EIO;
3360 goto fail;
3361 }
3362 }
3363 }
3364
Tejun Heo6b7ae952010-09-01 17:50:06 +02003365 return 0;
3366
3367fail:
Tejun Heoe5005b12010-12-09 16:13:15 +01003368 /* restore the old policy */
3369 link->lpm_policy = old_policy;
3370 if (ap && ap->slave_link)
3371 ap->slave_link->lpm_policy = old_policy;
3372
Tejun Heo6b7ae952010-09-01 17:50:06 +02003373 /* if no device or only one more chance is left, disable LPM */
3374 if (!dev || ehc->tries[dev->devno] <= 2) {
3375 ata_link_printk(link, KERN_WARNING,
3376 "disabling LPM on the link\n");
3377 link->flags |= ATA_LFLAG_NO_LPM;
3378 }
3379 if (r_failed_dev)
3380 *r_failed_dev = dev;
3381 return rc;
3382}
3383
Tejun Heo02607312007-08-06 18:36:23 +09003384static int ata_link_nr_enabled(struct ata_link *link)
Tejun Heo022bdb02006-05-15 20:58:22 +09003385{
Tejun Heof58229f2007-08-06 18:36:23 +09003386 struct ata_device *dev;
3387 int cnt = 0;
Tejun Heo022bdb02006-05-15 20:58:22 +09003388
Tejun Heo1eca4362008-11-03 20:03:17 +09003389 ata_for_each_dev(dev, link, ENABLED)
3390 cnt++;
Tejun Heo022bdb02006-05-15 20:58:22 +09003391 return cnt;
3392}
3393
Tejun Heo02607312007-08-06 18:36:23 +09003394static int ata_link_nr_vacant(struct ata_link *link)
Tejun Heo084fe632006-05-31 18:28:03 +09003395{
Tejun Heof58229f2007-08-06 18:36:23 +09003396 struct ata_device *dev;
3397 int cnt = 0;
Tejun Heo084fe632006-05-31 18:28:03 +09003398
Tejun Heo1eca4362008-11-03 20:03:17 +09003399 ata_for_each_dev(dev, link, ALL)
Tejun Heof58229f2007-08-06 18:36:23 +09003400 if (dev->class == ATA_DEV_UNKNOWN)
Tejun Heo084fe632006-05-31 18:28:03 +09003401 cnt++;
3402 return cnt;
3403}
3404
Tejun Heo02607312007-08-06 18:36:23 +09003405static int ata_eh_skip_recovery(struct ata_link *link)
Tejun Heo084fe632006-05-31 18:28:03 +09003406{
Tejun Heo672b2d62008-01-24 00:05:14 +09003407 struct ata_port *ap = link->ap;
Tejun Heo02607312007-08-06 18:36:23 +09003408 struct ata_eh_context *ehc = &link->eh_context;
Tejun Heof58229f2007-08-06 18:36:23 +09003409 struct ata_device *dev;
Tejun Heo084fe632006-05-31 18:28:03 +09003410
Tejun Heof9df58c2007-09-23 13:14:13 +09003411 /* skip disabled links */
3412 if (link->flags & ATA_LFLAG_DISABLED)
3413 return 1;
3414
Tejun Heoe2f3d752010-09-07 14:05:31 +02003415 /* skip if explicitly requested */
3416 if (ehc->i.flags & ATA_EHI_NO_RECOVERY)
3417 return 1;
3418
Tejun Heo672b2d62008-01-24 00:05:14 +09003419 /* thaw frozen port and recover failed devices */
3420 if ((ap->pflags & ATA_PFLAG_FROZEN) || ata_link_nr_enabled(link))
3421 return 0;
3422
3423 /* reset at least once if reset is requested */
3424 if ((ehc->i.action & ATA_EH_RESET) &&
3425 !(ehc->i.flags & ATA_EHI_DID_RESET))
Tejun Heo084fe632006-05-31 18:28:03 +09003426 return 0;
3427
3428 /* skip if class codes for all vacant slots are ATA_DEV_NONE */
Tejun Heo1eca4362008-11-03 20:03:17 +09003429 ata_for_each_dev(dev, link, ALL) {
Tejun Heo084fe632006-05-31 18:28:03 +09003430 if (dev->class == ATA_DEV_UNKNOWN &&
3431 ehc->classes[dev->devno] != ATA_DEV_NONE)
3432 return 0;
3433 }
3434
3435 return 1;
3436}
3437
Tejun Heoc2c7a892009-01-29 20:31:34 +09003438static int ata_count_probe_trials_cb(struct ata_ering_entry *ent, void *void_arg)
3439{
3440 u64 interval = msecs_to_jiffies(ATA_EH_PROBE_TRIAL_INTERVAL);
3441 u64 now = get_jiffies_64();
3442 int *trials = void_arg;
3443
3444 if (ent->timestamp < now - min(now, interval))
3445 return -1;
3446
3447 (*trials)++;
3448 return 0;
3449}
3450
Tejun Heo02c05a22007-11-27 19:28:54 +09003451static int ata_eh_schedule_probe(struct ata_device *dev)
3452{
3453 struct ata_eh_context *ehc = &dev->link->eh_context;
Tejun Heoc2c7a892009-01-29 20:31:34 +09003454 struct ata_link *link = ata_dev_phys_link(dev);
3455 int trials = 0;
Tejun Heo02c05a22007-11-27 19:28:54 +09003456
3457 if (!(ehc->i.probe_mask & (1 << dev->devno)) ||
3458 (ehc->did_probe_mask & (1 << dev->devno)))
3459 return 0;
3460
3461 ata_eh_detach_dev(dev);
3462 ata_dev_init(dev);
3463 ehc->did_probe_mask |= (1 << dev->devno);
Tejun Heocf480622008-01-24 00:05:14 +09003464 ehc->i.action |= ATA_EH_RESET;
Tejun Heo00115e02007-11-27 19:28:58 +09003465 ehc->saved_xfer_mode[dev->devno] = 0;
3466 ehc->saved_ncq_enabled &= ~(1 << dev->devno);
Tejun Heo02c05a22007-11-27 19:28:54 +09003467
Tejun Heo6b7ae952010-09-01 17:50:06 +02003468 /* the link maybe in a deep sleep, wake it up */
Tejun Heo6c8ea892010-09-01 17:50:07 +02003469 if (link->lpm_policy > ATA_LPM_MAX_POWER) {
3470 if (ata_is_host_link(link))
3471 link->ap->ops->set_lpm(link, ATA_LPM_MAX_POWER,
3472 ATA_LPM_EMPTY);
3473 else
3474 sata_pmp_set_lpm(link, ATA_LPM_MAX_POWER,
3475 ATA_LPM_EMPTY);
3476 }
Tejun Heo6b7ae952010-09-01 17:50:06 +02003477
Tejun Heoc2c7a892009-01-29 20:31:34 +09003478 /* Record and count probe trials on the ering. The specific
3479 * error mask used is irrelevant. Because a successful device
3480 * detection clears the ering, this count accumulates only if
3481 * there are consecutive failed probes.
3482 *
3483 * If the count is equal to or higher than ATA_EH_PROBE_TRIALS
3484 * in the last ATA_EH_PROBE_TRIAL_INTERVAL, link speed is
3485 * forced to 1.5Gbps.
3486 *
3487 * This is to work around cases where failed link speed
3488 * negotiation results in device misdetection leading to
3489 * infinite DEVXCHG or PHRDY CHG events.
3490 */
3491 ata_ering_record(&dev->ering, 0, AC_ERR_OTHER);
3492 ata_ering_map(&dev->ering, ata_count_probe_trials_cb, &trials);
3493
3494 if (trials > ATA_EH_PROBE_TRIALS)
3495 sata_down_spd_limit(link, 1);
3496
Tejun Heo02c05a22007-11-27 19:28:54 +09003497 return 1;
3498}
3499
Tejun Heo9b1e2652007-08-06 18:36:24 +09003500static int ata_eh_handle_dev_fail(struct ata_device *dev, int err)
Tejun Heofee7ca72007-07-01 19:05:58 +09003501{
Tejun Heo9af5c9c2007-08-06 18:36:22 +09003502 struct ata_eh_context *ehc = &dev->link->eh_context;
Tejun Heofee7ca72007-07-01 19:05:58 +09003503
Tejun Heocf9a5902009-01-29 20:31:35 +09003504 /* -EAGAIN from EH routine indicates retry without prejudice.
3505 * The requester is responsible for ensuring forward progress.
3506 */
3507 if (err != -EAGAIN)
3508 ehc->tries[dev->devno]--;
Tejun Heofee7ca72007-07-01 19:05:58 +09003509
3510 switch (err) {
3511 case -ENODEV:
3512 /* device missing or wrong IDENTIFY data, schedule probing */
3513 ehc->i.probe_mask |= (1 << dev->devno);
3514 case -EINVAL:
3515 /* give it just one more chance */
3516 ehc->tries[dev->devno] = min(ehc->tries[dev->devno], 1);
3517 case -EIO:
Tejun Heod89293a2009-01-29 20:31:29 +09003518 if (ehc->tries[dev->devno] == 1) {
Tejun Heofee7ca72007-07-01 19:05:58 +09003519 /* This is the last chance, better to slow
3520 * down than lose it.
3521 */
Tejun Heoa07d4992009-01-29 20:31:33 +09003522 sata_down_spd_limit(ata_dev_phys_link(dev), 0);
Tejun Heod89293a2009-01-29 20:31:29 +09003523 if (dev->pio_mode > XFER_PIO_0)
3524 ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
Tejun Heofee7ca72007-07-01 19:05:58 +09003525 }
3526 }
3527
3528 if (ata_dev_enabled(dev) && !ehc->tries[dev->devno]) {
3529 /* disable device if it has used up all its chances */
3530 ata_dev_disable(dev);
3531
3532 /* detach if offline */
Tejun Heob1c72912008-07-31 17:02:43 +09003533 if (ata_phys_link_offline(ata_dev_phys_link(dev)))
Tejun Heofee7ca72007-07-01 19:05:58 +09003534 ata_eh_detach_dev(dev);
3535
Tejun Heo02c05a22007-11-27 19:28:54 +09003536 /* schedule probe if necessary */
Tejun Heo87fbc5a2008-05-20 02:17:54 +09003537 if (ata_eh_schedule_probe(dev)) {
Tejun Heofee7ca72007-07-01 19:05:58 +09003538 ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
Tejun Heo87fbc5a2008-05-20 02:17:54 +09003539 memset(ehc->cmd_timeout_idx[dev->devno], 0,
3540 sizeof(ehc->cmd_timeout_idx[dev->devno]));
3541 }
Tejun Heo9b1e2652007-08-06 18:36:24 +09003542
3543 return 1;
Tejun Heofee7ca72007-07-01 19:05:58 +09003544 } else {
Tejun Heocf480622008-01-24 00:05:14 +09003545 ehc->i.action |= ATA_EH_RESET;
Tejun Heo9b1e2652007-08-06 18:36:24 +09003546 return 0;
Tejun Heofee7ca72007-07-01 19:05:58 +09003547 }
3548}
3549
Tejun Heo022bdb02006-05-15 20:58:22 +09003550/**
3551 * ata_eh_recover - recover host port after error
3552 * @ap: host port to recover
Tejun Heof5914a42006-05-31 18:27:48 +09003553 * @prereset: prereset method (can be NULL)
Tejun Heo022bdb02006-05-15 20:58:22 +09003554 * @softreset: softreset method (can be NULL)
3555 * @hardreset: hardreset method (can be NULL)
3556 * @postreset: postreset method (can be NULL)
Tejun Heo9b1e2652007-08-06 18:36:24 +09003557 * @r_failed_link: out parameter for failed link
Tejun Heo022bdb02006-05-15 20:58:22 +09003558 *
3559 * This is the alpha and omega, eum and yang, heart and soul of
3560 * libata exception handling. On entry, actions required to
Tejun Heo9b1e2652007-08-06 18:36:24 +09003561 * recover each link and hotplug requests are recorded in the
3562 * link's eh_context. This function executes all the operations
3563 * with appropriate retrials and fallbacks to resurrect failed
Tejun Heo084fe632006-05-31 18:28:03 +09003564 * devices, detach goners and greet newcomers.
Tejun Heo022bdb02006-05-15 20:58:22 +09003565 *
3566 * LOCKING:
3567 * Kernel thread context (may sleep).
3568 *
3569 * RETURNS:
3570 * 0 on success, -errno on failure.
3571 */
Tejun Heofb7fd612007-09-23 13:14:12 +09003572int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
3573 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
3574 ata_postreset_fn_t postreset,
3575 struct ata_link **r_failed_link)
Tejun Heo022bdb02006-05-15 20:58:22 +09003576{
Tejun Heo9b1e2652007-08-06 18:36:24 +09003577 struct ata_link *link;
Tejun Heo022bdb02006-05-15 20:58:22 +09003578 struct ata_device *dev;
Tejun Heo6b7ae952010-09-01 17:50:06 +02003579 int rc, nr_fails;
Elias Oltmanns45fabbb2008-09-21 11:54:08 +02003580 unsigned long flags, deadline;
Tejun Heo022bdb02006-05-15 20:58:22 +09003581
3582 DPRINTK("ENTER\n");
3583
3584 /* prep for recovery */
Tejun Heo1eca4362008-11-03 20:03:17 +09003585 ata_for_each_link(link, ap, EDGE) {
Tejun Heo9b1e2652007-08-06 18:36:24 +09003586 struct ata_eh_context *ehc = &link->eh_context;
Tejun Heo084fe632006-05-31 18:28:03 +09003587
Tejun Heof9df58c2007-09-23 13:14:13 +09003588 /* re-enable link? */
3589 if (ehc->i.action & ATA_EH_ENABLE_LINK) {
3590 ata_eh_about_to_do(link, NULL, ATA_EH_ENABLE_LINK);
3591 spin_lock_irqsave(ap->lock, flags);
3592 link->flags &= ~ATA_LFLAG_DISABLED;
3593 spin_unlock_irqrestore(ap->lock, flags);
3594 ata_eh_done(link, NULL, ATA_EH_ENABLE_LINK);
3595 }
3596
Tejun Heo1eca4362008-11-03 20:03:17 +09003597 ata_for_each_dev(dev, link, ALL) {
Tejun Heofd995f72007-09-23 13:14:12 +09003598 if (link->flags & ATA_LFLAG_NO_RETRY)
3599 ehc->tries[dev->devno] = 1;
3600 else
3601 ehc->tries[dev->devno] = ATA_EH_DEV_TRIES;
Tejun Heo79a55b72007-01-18 17:22:18 +09003602
Tejun Heo9b1e2652007-08-06 18:36:24 +09003603 /* collect port action mask recorded in dev actions */
3604 ehc->i.action |= ehc->i.dev_action[dev->devno] &
3605 ~ATA_EH_PERDEV_MASK;
3606 ehc->i.dev_action[dev->devno] &= ATA_EH_PERDEV_MASK;
Tejun Heo084fe632006-05-31 18:28:03 +09003607
Tejun Heo9b1e2652007-08-06 18:36:24 +09003608 /* process hotplug request */
3609 if (dev->flags & ATA_DFLAG_DETACH)
3610 ata_eh_detach_dev(dev);
3611
Tejun Heo02c05a22007-11-27 19:28:54 +09003612 /* schedule probe if necessary */
3613 if (!ata_dev_enabled(dev))
3614 ata_eh_schedule_probe(dev);
Tejun Heo084fe632006-05-31 18:28:03 +09003615 }
Tejun Heo022bdb02006-05-15 20:58:22 +09003616 }
3617
3618 retry:
Tejun Heo022bdb02006-05-15 20:58:22 +09003619 rc = 0;
3620
Tejun Heoaeb2ecd2006-06-12 14:11:43 +09003621 /* if UNLOADING, finish immediately */
Tejun Heob51e9e52006-06-29 01:29:30 +09003622 if (ap->pflags & ATA_PFLAG_UNLOADING)
Tejun Heoaeb2ecd2006-06-12 14:11:43 +09003623 goto out;
3624
Tejun Heo9b1e2652007-08-06 18:36:24 +09003625 /* prep for EH */
Tejun Heo1eca4362008-11-03 20:03:17 +09003626 ata_for_each_link(link, ap, EDGE) {
Tejun Heo9b1e2652007-08-06 18:36:24 +09003627 struct ata_eh_context *ehc = &link->eh_context;
Tejun Heo022bdb02006-05-15 20:58:22 +09003628
Tejun Heo9b1e2652007-08-06 18:36:24 +09003629 /* skip EH if possible. */
3630 if (ata_eh_skip_recovery(link))
3631 ehc->i.action = 0;
3632
Tejun Heo1eca4362008-11-03 20:03:17 +09003633 ata_for_each_dev(dev, link, ALL)
Tejun Heo9b1e2652007-08-06 18:36:24 +09003634 ehc->classes[dev->devno] = ATA_DEV_UNKNOWN;
3635 }
Tejun Heo084fe632006-05-31 18:28:03 +09003636
Tejun Heo022bdb02006-05-15 20:58:22 +09003637 /* reset */
Tejun Heo1eca4362008-11-03 20:03:17 +09003638 ata_for_each_link(link, ap, EDGE) {
Tejun Heodc98c322008-05-19 01:15:07 +09003639 struct ata_eh_context *ehc = &link->eh_context;
Tejun Heo022bdb02006-05-15 20:58:22 +09003640
Tejun Heodc98c322008-05-19 01:15:07 +09003641 if (!(ehc->i.action & ATA_EH_RESET))
3642 continue;
Tejun Heo9b1e2652007-08-06 18:36:24 +09003643
Tejun Heodc98c322008-05-19 01:15:07 +09003644 rc = ata_eh_reset(link, ata_link_nr_vacant(link),
3645 prereset, softreset, hardreset, postreset);
3646 if (rc) {
3647 ata_link_printk(link, KERN_ERR,
3648 "reset failed, giving up\n");
3649 goto out;
Tejun Heo022bdb02006-05-15 20:58:22 +09003650 }
Tejun Heo022bdb02006-05-15 20:58:22 +09003651 }
3652
Elias Oltmanns45fabbb2008-09-21 11:54:08 +02003653 do {
3654 unsigned long now;
3655
3656 /*
3657 * clears ATA_EH_PARK in eh_info and resets
3658 * ap->park_req_pending
3659 */
3660 ata_eh_pull_park_action(ap);
3661
3662 deadline = jiffies;
Tejun Heo1eca4362008-11-03 20:03:17 +09003663 ata_for_each_link(link, ap, EDGE) {
3664 ata_for_each_dev(dev, link, ALL) {
Elias Oltmanns45fabbb2008-09-21 11:54:08 +02003665 struct ata_eh_context *ehc = &link->eh_context;
3666 unsigned long tmp;
3667
3668 if (dev->class != ATA_DEV_ATA)
3669 continue;
3670 if (!(ehc->i.dev_action[dev->devno] &
3671 ATA_EH_PARK))
3672 continue;
3673 tmp = dev->unpark_deadline;
3674 if (time_before(deadline, tmp))
3675 deadline = tmp;
3676 else if (time_before_eq(tmp, jiffies))
3677 continue;
3678 if (ehc->unloaded_mask & (1 << dev->devno))
3679 continue;
3680
3681 ata_eh_park_issue_cmd(dev, 1);
3682 }
3683 }
3684
3685 now = jiffies;
3686 if (time_before_eq(deadline, now))
3687 break;
3688
Tejun Heoc0c362b2010-09-06 17:57:14 +02003689 ata_eh_release(ap);
Elias Oltmanns45fabbb2008-09-21 11:54:08 +02003690 deadline = wait_for_completion_timeout(&ap->park_req_pending,
3691 deadline - now);
Tejun Heoc0c362b2010-09-06 17:57:14 +02003692 ata_eh_acquire(ap);
Elias Oltmanns45fabbb2008-09-21 11:54:08 +02003693 } while (deadline);
Tejun Heo1eca4362008-11-03 20:03:17 +09003694 ata_for_each_link(link, ap, EDGE) {
3695 ata_for_each_dev(dev, link, ALL) {
Elias Oltmanns45fabbb2008-09-21 11:54:08 +02003696 if (!(link->eh_context.unloaded_mask &
3697 (1 << dev->devno)))
3698 continue;
3699
3700 ata_eh_park_issue_cmd(dev, 0);
3701 ata_eh_done(link, dev, ATA_EH_PARK);
3702 }
3703 }
3704
Tejun Heo9b1e2652007-08-06 18:36:24 +09003705 /* the rest */
Tejun Heo6b7ae952010-09-01 17:50:06 +02003706 nr_fails = 0;
3707 ata_for_each_link(link, ap, PMP_FIRST) {
Tejun Heo9b1e2652007-08-06 18:36:24 +09003708 struct ata_eh_context *ehc = &link->eh_context;
Tejun Heo022bdb02006-05-15 20:58:22 +09003709
Tejun Heo6b7ae952010-09-01 17:50:06 +02003710 if (sata_pmp_attached(ap) && ata_is_host_link(link))
3711 goto config_lpm;
3712
Tejun Heo9b1e2652007-08-06 18:36:24 +09003713 /* revalidate existing devices and attach new ones */
3714 rc = ata_eh_revalidate_and_attach(link, &dev);
Tejun Heo4ae72a12007-02-02 16:22:30 +09003715 if (rc)
Tejun Heo6b7ae952010-09-01 17:50:06 +02003716 goto rest_fail;
Tejun Heo9b1e2652007-08-06 18:36:24 +09003717
Tejun Heo633273a2007-09-23 13:19:54 +09003718 /* if PMP got attached, return, pmp EH will take care of it */
3719 if (link->device->class == ATA_DEV_PMP) {
3720 ehc->i.action = 0;
3721 return 0;
3722 }
3723
Tejun Heo9b1e2652007-08-06 18:36:24 +09003724 /* configure transfer mode if necessary */
3725 if (ehc->i.flags & ATA_EHI_SETMODE) {
3726 rc = ata_set_mode(link, &dev);
3727 if (rc)
Tejun Heo6b7ae952010-09-01 17:50:06 +02003728 goto rest_fail;
Tejun Heo9b1e2652007-08-06 18:36:24 +09003729 ehc->i.flags &= ~ATA_EHI_SETMODE;
3730 }
3731
Tejun Heo11fc33d2008-08-30 14:20:01 +02003732 /* If reset has been issued, clear UA to avoid
3733 * disrupting the current users of the device.
3734 */
3735 if (ehc->i.flags & ATA_EHI_DID_RESET) {
Tejun Heo1eca4362008-11-03 20:03:17 +09003736 ata_for_each_dev(dev, link, ALL) {
Tejun Heo11fc33d2008-08-30 14:20:01 +02003737 if (dev->class != ATA_DEV_ATAPI)
3738 continue;
3739 rc = atapi_eh_clear_ua(dev);
3740 if (rc)
Tejun Heo6b7ae952010-09-01 17:50:06 +02003741 goto rest_fail;
Tejun Heo11fc33d2008-08-30 14:20:01 +02003742 }
3743 }
3744
Tejun Heo6013efd2009-11-19 15:36:45 +09003745 /* retry flush if necessary */
3746 ata_for_each_dev(dev, link, ALL) {
3747 if (dev->class != ATA_DEV_ATA)
3748 continue;
3749 rc = ata_eh_maybe_retry_flush(dev);
3750 if (rc)
Tejun Heo6b7ae952010-09-01 17:50:06 +02003751 goto rest_fail;
Tejun Heo6013efd2009-11-19 15:36:45 +09003752 }
3753
Tejun Heo6b7ae952010-09-01 17:50:06 +02003754 config_lpm:
Tejun Heo11fc33d2008-08-30 14:20:01 +02003755 /* configure link power saving */
Tejun Heo6b7ae952010-09-01 17:50:06 +02003756 if (link->lpm_policy != ap->target_lpm_policy) {
3757 rc = ata_eh_set_lpm(link, ap->target_lpm_policy, &dev);
3758 if (rc)
3759 goto rest_fail;
3760 }
Kristen Carlson Accardica773292007-10-25 00:58:59 -04003761
Tejun Heo9b1e2652007-08-06 18:36:24 +09003762 /* this link is okay now */
3763 ehc->i.flags = 0;
3764 continue;
3765
Tejun Heo6b7ae952010-09-01 17:50:06 +02003766 rest_fail:
3767 nr_fails++;
3768 if (dev)
3769 ata_eh_handle_dev_fail(dev, rc);
Tejun Heo9b1e2652007-08-06 18:36:24 +09003770
Tejun Heob06ce3e2007-10-09 15:06:48 +09003771 if (ap->pflags & ATA_PFLAG_FROZEN) {
3772 /* PMP reset requires working host port.
3773 * Can't retry if it's frozen.
3774 */
Tejun Heo071f44b2008-04-07 22:47:22 +09003775 if (sata_pmp_attached(ap))
Tejun Heob06ce3e2007-10-09 15:06:48 +09003776 goto out;
Tejun Heo9b1e2652007-08-06 18:36:24 +09003777 break;
Tejun Heob06ce3e2007-10-09 15:06:48 +09003778 }
Tejun Heo022bdb02006-05-15 20:58:22 +09003779 }
3780
Tejun Heo6b7ae952010-09-01 17:50:06 +02003781 if (nr_fails)
Tejun Heo9b1e2652007-08-06 18:36:24 +09003782 goto retry;
Tejun Heo022bdb02006-05-15 20:58:22 +09003783
Tejun Heo022bdb02006-05-15 20:58:22 +09003784 out:
Tejun Heo9b1e2652007-08-06 18:36:24 +09003785 if (rc && r_failed_link)
3786 *r_failed_link = link;
Tejun Heo022bdb02006-05-15 20:58:22 +09003787
3788 DPRINTK("EXIT, rc=%d\n", rc);
3789 return rc;
3790}
3791
3792/**
3793 * ata_eh_finish - finish up EH
3794 * @ap: host port to finish EH for
3795 *
3796 * Recovery is complete. Clean up EH states and retry or finish
3797 * failed qcs.
3798 *
3799 * LOCKING:
3800 * None.
3801 */
Tejun Heofb7fd612007-09-23 13:14:12 +09003802void ata_eh_finish(struct ata_port *ap)
Tejun Heo022bdb02006-05-15 20:58:22 +09003803{
3804 int tag;
3805
3806 /* retry or finish qcs */
3807 for (tag = 0; tag < ATA_MAX_QUEUE; tag++) {
3808 struct ata_queued_cmd *qc = __ata_qc_from_tag(ap, tag);
3809
3810 if (!(qc->flags & ATA_QCFLAG_FAILED))
3811 continue;
3812
3813 if (qc->err_mask) {
3814 /* FIXME: Once EH migration is complete,
3815 * generate sense data in this function,
3816 * considering both err_mask and tf.
3817 */
Tejun Heo03faab72008-03-27 19:14:24 +09003818 if (qc->flags & ATA_QCFLAG_RETRY)
Tejun Heo022bdb02006-05-15 20:58:22 +09003819 ata_eh_qc_retry(qc);
Tejun Heo03faab72008-03-27 19:14:24 +09003820 else
3821 ata_eh_qc_complete(qc);
Tejun Heo022bdb02006-05-15 20:58:22 +09003822 } else {
3823 if (qc->flags & ATA_QCFLAG_SENSE_VALID) {
3824 ata_eh_qc_complete(qc);
3825 } else {
3826 /* feed zero TF to sense generation */
3827 memset(&qc->result_tf, 0, sizeof(qc->result_tf));
3828 ata_eh_qc_retry(qc);
3829 }
3830 }
3831 }
Tejun Heoda917d62007-09-23 13:14:12 +09003832
3833 /* make sure nr_active_links is zero after EH */
3834 WARN_ON(ap->nr_active_links);
3835 ap->nr_active_links = 0;
Tejun Heo022bdb02006-05-15 20:58:22 +09003836}
3837
3838/**
3839 * ata_do_eh - do standard error handling
3840 * @ap: host port to handle error for
Tejun Heoa1efdab2008-03-25 12:22:50 +09003841 *
Tejun Heof5914a42006-05-31 18:27:48 +09003842 * @prereset: prereset method (can be NULL)
Tejun Heo022bdb02006-05-15 20:58:22 +09003843 * @softreset: softreset method (can be NULL)
3844 * @hardreset: hardreset method (can be NULL)
3845 * @postreset: postreset method (can be NULL)
3846 *
3847 * Perform standard error handling sequence.
3848 *
3849 * LOCKING:
3850 * Kernel thread context (may sleep).
3851 */
Tejun Heof5914a42006-05-31 18:27:48 +09003852void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
3853 ata_reset_fn_t softreset, ata_reset_fn_t hardreset,
3854 ata_postreset_fn_t postreset)
Tejun Heo022bdb02006-05-15 20:58:22 +09003855{
Tejun Heo9b1e2652007-08-06 18:36:24 +09003856 struct ata_device *dev;
3857 int rc;
3858
3859 ata_eh_autopsy(ap);
3860 ata_eh_report(ap);
3861
3862 rc = ata_eh_recover(ap, prereset, softreset, hardreset, postreset,
3863 NULL);
3864 if (rc) {
Tejun Heo1eca4362008-11-03 20:03:17 +09003865 ata_for_each_dev(dev, &ap->link, ALL)
Tejun Heo9b1e2652007-08-06 18:36:24 +09003866 ata_dev_disable(dev);
3867 }
3868
Tejun Heo022bdb02006-05-15 20:58:22 +09003869 ata_eh_finish(ap);
3870}
Tejun Heo500530f2006-07-03 16:07:27 +09003871
Tejun Heoa1efdab2008-03-25 12:22:50 +09003872/**
3873 * ata_std_error_handler - standard error handler
3874 * @ap: host port to handle error for
3875 *
3876 * Standard error handler
3877 *
3878 * LOCKING:
3879 * Kernel thread context (may sleep).
3880 */
3881void ata_std_error_handler(struct ata_port *ap)
3882{
3883 struct ata_port_operations *ops = ap->ops;
3884 ata_reset_fn_t hardreset = ops->hardreset;
3885
Tejun Heo57c9efd2008-04-07 22:47:19 +09003886 /* ignore built-in hardreset if SCR access is not available */
Tejun Heofe06e5f2010-05-10 21:41:39 +02003887 if (hardreset == sata_std_hardreset && !sata_scr_valid(&ap->link))
Tejun Heoa1efdab2008-03-25 12:22:50 +09003888 hardreset = NULL;
3889
3890 ata_do_eh(ap, ops->prereset, ops->softreset, hardreset, ops->postreset);
3891}
3892
Tejun Heo6ffa01d2007-03-02 17:32:47 +09003893#ifdef CONFIG_PM
Tejun Heo500530f2006-07-03 16:07:27 +09003894/**
3895 * ata_eh_handle_port_suspend - perform port suspend operation
3896 * @ap: port to suspend
3897 *
3898 * Suspend @ap.
3899 *
3900 * LOCKING:
3901 * Kernel thread context (may sleep).
3902 */
3903static void ata_eh_handle_port_suspend(struct ata_port *ap)
3904{
3905 unsigned long flags;
3906 int rc = 0;
3907
3908 /* are we suspending? */
3909 spin_lock_irqsave(ap->lock, flags);
3910 if (!(ap->pflags & ATA_PFLAG_PM_PENDING) ||
3911 ap->pm_mesg.event == PM_EVENT_ON) {
3912 spin_unlock_irqrestore(ap->lock, flags);
3913 return;
3914 }
3915 spin_unlock_irqrestore(ap->lock, flags);
3916
3917 WARN_ON(ap->pflags & ATA_PFLAG_SUSPENDED);
3918
Tejun Heo64578a32007-05-15 03:28:16 +09003919 /* tell ACPI we're suspending */
3920 rc = ata_acpi_on_suspend(ap);
3921 if (rc)
3922 goto out;
3923
Tejun Heo500530f2006-07-03 16:07:27 +09003924 /* suspend */
3925 ata_eh_freeze_port(ap);
3926
3927 if (ap->ops->port_suspend)
3928 rc = ap->ops->port_suspend(ap, ap->pm_mesg);
3929
Shaohua Libd3adca2007-11-02 09:32:38 +08003930 ata_acpi_set_state(ap, PMSG_SUSPEND);
Tejun Heo64578a32007-05-15 03:28:16 +09003931 out:
Tejun Heo500530f2006-07-03 16:07:27 +09003932 /* report result */
3933 spin_lock_irqsave(ap->lock, flags);
3934
3935 ap->pflags &= ~ATA_PFLAG_PM_PENDING;
3936 if (rc == 0)
3937 ap->pflags |= ATA_PFLAG_SUSPENDED;
Tejun Heo64578a32007-05-15 03:28:16 +09003938 else if (ap->pflags & ATA_PFLAG_FROZEN)
Tejun Heo500530f2006-07-03 16:07:27 +09003939 ata_port_schedule_eh(ap);
3940
3941 if (ap->pm_result) {
3942 *ap->pm_result = rc;
3943 ap->pm_result = NULL;
3944 }
3945
3946 spin_unlock_irqrestore(ap->lock, flags);
3947
3948 return;
3949}
3950
3951/**
3952 * ata_eh_handle_port_resume - perform port resume operation
3953 * @ap: port to resume
3954 *
3955 * Resume @ap.
3956 *
Tejun Heo500530f2006-07-03 16:07:27 +09003957 * LOCKING:
3958 * Kernel thread context (may sleep).
3959 */
3960static void ata_eh_handle_port_resume(struct ata_port *ap)
3961{
Tejun Heo6f9c1ea2009-04-23 09:55:28 +09003962 struct ata_link *link;
3963 struct ata_device *dev;
Tejun Heo500530f2006-07-03 16:07:27 +09003964 unsigned long flags;
Tejun Heo9666f402007-05-04 21:27:47 +02003965 int rc = 0;
Tejun Heo500530f2006-07-03 16:07:27 +09003966
3967 /* are we resuming? */
3968 spin_lock_irqsave(ap->lock, flags);
3969 if (!(ap->pflags & ATA_PFLAG_PM_PENDING) ||
3970 ap->pm_mesg.event != PM_EVENT_ON) {
3971 spin_unlock_irqrestore(ap->lock, flags);
3972 return;
3973 }
3974 spin_unlock_irqrestore(ap->lock, flags);
3975
Tejun Heo9666f402007-05-04 21:27:47 +02003976 WARN_ON(!(ap->pflags & ATA_PFLAG_SUSPENDED));
Tejun Heo500530f2006-07-03 16:07:27 +09003977
Tejun Heo6f9c1ea2009-04-23 09:55:28 +09003978 /*
3979 * Error timestamps are in jiffies which doesn't run while
3980 * suspended and PHY events during resume isn't too uncommon.
3981 * When the two are combined, it can lead to unnecessary speed
3982 * downs if the machine is suspended and resumed repeatedly.
3983 * Clear error history.
3984 */
3985 ata_for_each_link(link, ap, HOST_FIRST)
3986 ata_for_each_dev(dev, link, ALL)
3987 ata_ering_clear(&dev->ering);
3988
Shaohua Libd3adca2007-11-02 09:32:38 +08003989 ata_acpi_set_state(ap, PMSG_ON);
3990
Tejun Heo500530f2006-07-03 16:07:27 +09003991 if (ap->ops->port_resume)
3992 rc = ap->ops->port_resume(ap);
3993
Tejun Heo67465442007-05-15 03:28:16 +09003994 /* tell ACPI that we're resuming */
3995 ata_acpi_on_resume(ap);
3996
Tejun Heo9666f402007-05-04 21:27:47 +02003997 /* report result */
Tejun Heo500530f2006-07-03 16:07:27 +09003998 spin_lock_irqsave(ap->lock, flags);
3999 ap->pflags &= ~(ATA_PFLAG_PM_PENDING | ATA_PFLAG_SUSPENDED);
4000 if (ap->pm_result) {
4001 *ap->pm_result = rc;
4002 ap->pm_result = NULL;
4003 }
4004 spin_unlock_irqrestore(ap->lock, flags);
4005}
Tejun Heo6ffa01d2007-03-02 17:32:47 +09004006#endif /* CONFIG_PM */