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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * SATA specific part of ATA helper library
4 *
5 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
6 * Copyright 2003-2004 Jeff Garzik
7 * Copyright 2006 Tejun Heo <htejun@gmail.com>
8 */
9
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <scsi/scsi_cmnd.h>
13#include <scsi/scsi_device.h>
14#include <linux/libata.h>
15
16#include "libata.h"
17#include "libata-transport.h"
18
19/* debounce timing parameters in msecs { interval, duration, timeout } */
20const unsigned long sata_deb_timing_normal[] = { 5, 100, 2000 };
21EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
22const unsigned long sata_deb_timing_hotplug[] = { 25, 500, 2000 };
23EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
24const unsigned long sata_deb_timing_long[] = { 100, 2000, 5000 };
25EXPORT_SYMBOL_GPL(sata_deb_timing_long);
26
27/**
28 * sata_scr_valid - test whether SCRs are accessible
29 * @link: ATA link to test SCR accessibility for
30 *
31 * Test whether SCRs are accessible for @link.
32 *
33 * LOCKING:
34 * None.
35 *
36 * RETURNS:
37 * 1 if SCRs are accessible, 0 otherwise.
38 */
39int sata_scr_valid(struct ata_link *link)
40{
41 struct ata_port *ap = link->ap;
42
43 return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
44}
45EXPORT_SYMBOL_GPL(sata_scr_valid);
46
47/**
48 * sata_scr_read - read SCR register of the specified port
49 * @link: ATA link to read SCR for
50 * @reg: SCR to read
51 * @val: Place to store read value
52 *
53 * Read SCR register @reg of @link into *@val. This function is
54 * guaranteed to succeed if @link is ap->link, the cable type of
55 * the port is SATA and the port implements ->scr_read.
56 *
57 * LOCKING:
58 * None if @link is ap->link. Kernel thread context otherwise.
59 *
60 * RETURNS:
61 * 0 on success, negative errno on failure.
62 */
63int sata_scr_read(struct ata_link *link, int reg, u32 *val)
64{
65 if (ata_is_host_link(link)) {
66 if (sata_scr_valid(link))
67 return link->ap->ops->scr_read(link, reg, val);
68 return -EOPNOTSUPP;
69 }
70
71 return sata_pmp_scr_read(link, reg, val);
72}
73EXPORT_SYMBOL_GPL(sata_scr_read);
74
75/**
76 * sata_scr_write - write SCR register of the specified port
77 * @link: ATA link to write SCR for
78 * @reg: SCR to write
79 * @val: value to write
80 *
81 * Write @val to SCR register @reg of @link. This function is
82 * guaranteed to succeed if @link is ap->link, the cable type of
83 * the port is SATA and the port implements ->scr_read.
84 *
85 * LOCKING:
86 * None if @link is ap->link. Kernel thread context otherwise.
87 *
88 * RETURNS:
89 * 0 on success, negative errno on failure.
90 */
91int sata_scr_write(struct ata_link *link, int reg, u32 val)
92{
93 if (ata_is_host_link(link)) {
94 if (sata_scr_valid(link))
95 return link->ap->ops->scr_write(link, reg, val);
96 return -EOPNOTSUPP;
97 }
98
99 return sata_pmp_scr_write(link, reg, val);
100}
101EXPORT_SYMBOL_GPL(sata_scr_write);
102
103/**
104 * sata_scr_write_flush - write SCR register of the specified port and flush
105 * @link: ATA link to write SCR for
106 * @reg: SCR to write
107 * @val: value to write
108 *
109 * This function is identical to sata_scr_write() except that this
110 * function performs flush after writing to the register.
111 *
112 * LOCKING:
113 * None if @link is ap->link. Kernel thread context otherwise.
114 *
115 * RETURNS:
116 * 0 on success, negative errno on failure.
117 */
118int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
119{
120 if (ata_is_host_link(link)) {
121 int rc;
122
123 if (sata_scr_valid(link)) {
124 rc = link->ap->ops->scr_write(link, reg, val);
125 if (rc == 0)
126 rc = link->ap->ops->scr_read(link, reg, &val);
127 return rc;
128 }
129 return -EOPNOTSUPP;
130 }
131
132 return sata_pmp_scr_write(link, reg, val);
133}
134EXPORT_SYMBOL_GPL(sata_scr_write_flush);
135
136/**
137 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
138 * @tf: Taskfile to convert
139 * @pmp: Port multiplier port
140 * @is_cmd: This FIS is for command
141 * @fis: Buffer into which data will output
142 *
143 * Converts a standard ATA taskfile to a Serial ATA
144 * FIS structure (Register - Host to Device).
145 *
146 * LOCKING:
147 * Inherited from caller.
148 */
149void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
150{
151 fis[0] = 0x27; /* Register - Host to Device FIS */
152 fis[1] = pmp & 0xf; /* Port multiplier number*/
153 if (is_cmd)
154 fis[1] |= (1 << 7); /* bit 7 indicates Command FIS */
155
156 fis[2] = tf->command;
157 fis[3] = tf->feature;
158
159 fis[4] = tf->lbal;
160 fis[5] = tf->lbam;
161 fis[6] = tf->lbah;
162 fis[7] = tf->device;
163
164 fis[8] = tf->hob_lbal;
165 fis[9] = tf->hob_lbam;
166 fis[10] = tf->hob_lbah;
167 fis[11] = tf->hob_feature;
168
169 fis[12] = tf->nsect;
170 fis[13] = tf->hob_nsect;
171 fis[14] = 0;
172 fis[15] = tf->ctl;
173
174 fis[16] = tf->auxiliary & 0xff;
175 fis[17] = (tf->auxiliary >> 8) & 0xff;
176 fis[18] = (tf->auxiliary >> 16) & 0xff;
177 fis[19] = (tf->auxiliary >> 24) & 0xff;
178}
179EXPORT_SYMBOL_GPL(ata_tf_to_fis);
180
181/**
182 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
183 * @fis: Buffer from which data will be input
184 * @tf: Taskfile to output
185 *
186 * Converts a serial ATA FIS structure to a standard ATA taskfile.
187 *
188 * LOCKING:
189 * Inherited from caller.
190 */
191
192void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
193{
194 tf->command = fis[2]; /* status */
195 tf->feature = fis[3]; /* error */
196
197 tf->lbal = fis[4];
198 tf->lbam = fis[5];
199 tf->lbah = fis[6];
200 tf->device = fis[7];
201
202 tf->hob_lbal = fis[8];
203 tf->hob_lbam = fis[9];
204 tf->hob_lbah = fis[10];
205
206 tf->nsect = fis[12];
207 tf->hob_nsect = fis[13];
208}
209EXPORT_SYMBOL_GPL(ata_tf_from_fis);
210
211/**
212 * sata_link_debounce - debounce SATA phy status
213 * @link: ATA link to debounce SATA phy status for
214 * @params: timing parameters { interval, duration, timeout } in msec
215 * @deadline: deadline jiffies for the operation
216 *
217 * Make sure SStatus of @link reaches stable state, determined by
218 * holding the same value where DET is not 1 for @duration polled
219 * every @interval, before @timeout. Timeout constraints the
220 * beginning of the stable state. Because DET gets stuck at 1 on
221 * some controllers after hot unplugging, this functions waits
222 * until timeout then returns 0 if DET is stable at 1.
223 *
224 * @timeout is further limited by @deadline. The sooner of the
225 * two is used.
226 *
227 * LOCKING:
228 * Kernel thread context (may sleep)
229 *
230 * RETURNS:
231 * 0 on success, -errno on failure.
232 */
233int sata_link_debounce(struct ata_link *link, const unsigned long *params,
234 unsigned long deadline)
235{
236 unsigned long interval = params[0];
237 unsigned long duration = params[1];
238 unsigned long last_jiffies, t;
239 u32 last, cur;
240 int rc;
241
242 t = ata_deadline(jiffies, params[2]);
243 if (time_before(t, deadline))
244 deadline = t;
245
246 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
247 return rc;
248 cur &= 0xf;
249
250 last = cur;
251 last_jiffies = jiffies;
252
253 while (1) {
254 ata_msleep(link->ap, interval);
255 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
256 return rc;
257 cur &= 0xf;
258
259 /* DET stable? */
260 if (cur == last) {
261 if (cur == 1 && time_before(jiffies, deadline))
262 continue;
263 if (time_after(jiffies,
264 ata_deadline(last_jiffies, duration)))
265 return 0;
266 continue;
267 }
268
269 /* unstable, start over */
270 last = cur;
271 last_jiffies = jiffies;
272
273 /* Check deadline. If debouncing failed, return
274 * -EPIPE to tell upper layer to lower link speed.
275 */
276 if (time_after(jiffies, deadline))
277 return -EPIPE;
278 }
279}
280EXPORT_SYMBOL_GPL(sata_link_debounce);
281
282/**
283 * sata_link_resume - resume SATA link
284 * @link: ATA link to resume SATA
285 * @params: timing parameters { interval, duration, timeout } in msec
286 * @deadline: deadline jiffies for the operation
287 *
288 * Resume SATA phy @link and debounce it.
289 *
290 * LOCKING:
291 * Kernel thread context (may sleep)
292 *
293 * RETURNS:
294 * 0 on success, -errno on failure.
295 */
296int sata_link_resume(struct ata_link *link, const unsigned long *params,
297 unsigned long deadline)
298{
299 int tries = ATA_LINK_RESUME_TRIES;
300 u32 scontrol, serror;
301 int rc;
302
303 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
304 return rc;
305
306 /*
307 * Writes to SControl sometimes get ignored under certain
308 * controllers (ata_piix SIDPR). Make sure DET actually is
309 * cleared.
310 */
311 do {
312 scontrol = (scontrol & 0x0f0) | 0x300;
313 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
314 return rc;
315 /*
316 * Some PHYs react badly if SStatus is pounded
317 * immediately after resuming. Delay 200ms before
318 * debouncing.
319 */
320 if (!(link->flags & ATA_LFLAG_NO_DB_DELAY))
321 ata_msleep(link->ap, 200);
322
323 /* is SControl restored correctly? */
324 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
325 return rc;
326 } while ((scontrol & 0xf0f) != 0x300 && --tries);
327
328 if ((scontrol & 0xf0f) != 0x300) {
329 ata_link_warn(link, "failed to resume link (SControl %X)\n",
330 scontrol);
331 return 0;
332 }
333
334 if (tries < ATA_LINK_RESUME_TRIES)
335 ata_link_warn(link, "link resume succeeded after %d retries\n",
336 ATA_LINK_RESUME_TRIES - tries);
337
338 if ((rc = sata_link_debounce(link, params, deadline)))
339 return rc;
340
341 /* clear SError, some PHYs require this even for SRST to work */
342 if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
343 rc = sata_scr_write(link, SCR_ERROR, serror);
344
345 return rc != -EINVAL ? rc : 0;
346}
347EXPORT_SYMBOL_GPL(sata_link_resume);
348
349/**
350 * sata_link_scr_lpm - manipulate SControl IPM and SPM fields
351 * @link: ATA link to manipulate SControl for
352 * @policy: LPM policy to configure
353 * @spm_wakeup: initiate LPM transition to active state
354 *
355 * Manipulate the IPM field of the SControl register of @link
356 * according to @policy. If @policy is ATA_LPM_MAX_POWER and
357 * @spm_wakeup is %true, the SPM field is manipulated to wake up
358 * the link. This function also clears PHYRDY_CHG before
359 * returning.
360 *
361 * LOCKING:
362 * EH context.
363 *
364 * RETURNS:
365 * 0 on success, -errno otherwise.
366 */
367int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
368 bool spm_wakeup)
369{
370 struct ata_eh_context *ehc = &link->eh_context;
371 bool woken_up = false;
372 u32 scontrol;
373 int rc;
374
375 rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
376 if (rc)
377 return rc;
378
379 switch (policy) {
380 case ATA_LPM_MAX_POWER:
381 /* disable all LPM transitions */
382 scontrol |= (0x7 << 8);
383 /* initiate transition to active state */
384 if (spm_wakeup) {
385 scontrol |= (0x4 << 12);
386 woken_up = true;
387 }
388 break;
389 case ATA_LPM_MED_POWER:
390 /* allow LPM to PARTIAL */
391 scontrol &= ~(0x1 << 8);
392 scontrol |= (0x6 << 8);
393 break;
394 case ATA_LPM_MED_POWER_WITH_DIPM:
395 case ATA_LPM_MIN_POWER_WITH_PARTIAL:
396 case ATA_LPM_MIN_POWER:
397 if (ata_link_nr_enabled(link) > 0)
398 /* no restrictions on LPM transitions */
399 scontrol &= ~(0x7 << 8);
400 else {
401 /* empty port, power off */
402 scontrol &= ~0xf;
403 scontrol |= (0x1 << 2);
404 }
405 break;
406 default:
407 WARN_ON(1);
408 }
409
410 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
411 if (rc)
412 return rc;
413
414 /* give the link time to transit out of LPM state */
415 if (woken_up)
416 msleep(10);
417
418 /* clear PHYRDY_CHG from SError */
419 ehc->i.serror &= ~SERR_PHYRDY_CHG;
420 return sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
421}
422EXPORT_SYMBOL_GPL(sata_link_scr_lpm);
423
424static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
425{
426 struct ata_link *host_link = &link->ap->link;
427 u32 limit, target, spd;
428
429 limit = link->sata_spd_limit;
430
431 /* Don't configure downstream link faster than upstream link.
432 * It doesn't speed up anything and some PMPs choke on such
433 * configuration.
434 */
435 if (!ata_is_host_link(link) && host_link->sata_spd)
436 limit &= (1 << host_link->sata_spd) - 1;
437
438 if (limit == UINT_MAX)
439 target = 0;
440 else
441 target = fls(limit);
442
443 spd = (*scontrol >> 4) & 0xf;
444 *scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
445
446 return spd != target;
447}
448
449/**
450 * sata_set_spd_needed - is SATA spd configuration needed
451 * @link: Link in question
452 *
453 * Test whether the spd limit in SControl matches
454 * @link->sata_spd_limit. This function is used to determine
455 * whether hardreset is necessary to apply SATA spd
456 * configuration.
457 *
458 * LOCKING:
459 * Inherited from caller.
460 *
461 * RETURNS:
462 * 1 if SATA spd configuration is needed, 0 otherwise.
463 */
464static int sata_set_spd_needed(struct ata_link *link)
465{
466 u32 scontrol;
467
468 if (sata_scr_read(link, SCR_CONTROL, &scontrol))
469 return 1;
470
471 return __sata_set_spd_needed(link, &scontrol);
472}
473
474/**
475 * sata_set_spd - set SATA spd according to spd limit
476 * @link: Link to set SATA spd for
477 *
478 * Set SATA spd of @link according to sata_spd_limit.
479 *
480 * LOCKING:
481 * Inherited from caller.
482 *
483 * RETURNS:
484 * 0 if spd doesn't need to be changed, 1 if spd has been
485 * changed. Negative errno if SCR registers are inaccessible.
486 */
487int sata_set_spd(struct ata_link *link)
488{
489 u32 scontrol;
490 int rc;
491
492 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
493 return rc;
494
495 if (!__sata_set_spd_needed(link, &scontrol))
496 return 0;
497
498 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
499 return rc;
500
501 return 1;
502}
503EXPORT_SYMBOL_GPL(sata_set_spd);
504
505/**
506 * sata_link_hardreset - reset link via SATA phy reset
507 * @link: link to reset
508 * @timing: timing parameters { interval, duration, timeout } in msec
509 * @deadline: deadline jiffies for the operation
510 * @online: optional out parameter indicating link onlineness
511 * @check_ready: optional callback to check link readiness
512 *
513 * SATA phy-reset @link using DET bits of SControl register.
514 * After hardreset, link readiness is waited upon using
515 * ata_wait_ready() if @check_ready is specified. LLDs are
516 * allowed to not specify @check_ready and wait itself after this
517 * function returns. Device classification is LLD's
518 * responsibility.
519 *
520 * *@online is set to one iff reset succeeded and @link is online
521 * after reset.
522 *
523 * LOCKING:
524 * Kernel thread context (may sleep)
525 *
526 * RETURNS:
527 * 0 on success, -errno otherwise.
528 */
529int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
530 unsigned long deadline,
531 bool *online, int (*check_ready)(struct ata_link *))
532{
533 u32 scontrol;
534 int rc;
535
536 DPRINTK("ENTER\n");
537
538 if (online)
539 *online = false;
540
541 if (sata_set_spd_needed(link)) {
542 /* SATA spec says nothing about how to reconfigure
543 * spd. To be on the safe side, turn off phy during
544 * reconfiguration. This works for at least ICH7 AHCI
545 * and Sil3124.
546 */
547 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
548 goto out;
549
550 scontrol = (scontrol & 0x0f0) | 0x304;
551
552 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
553 goto out;
554
555 sata_set_spd(link);
556 }
557
558 /* issue phy wake/reset */
559 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
560 goto out;
561
562 scontrol = (scontrol & 0x0f0) | 0x301;
563
564 if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
565 goto out;
566
567 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
568 * 10.4.2 says at least 1 ms.
569 */
570 ata_msleep(link->ap, 1);
571
572 /* bring link back */
573 rc = sata_link_resume(link, timing, deadline);
574 if (rc)
575 goto out;
576 /* if link is offline nothing more to do */
577 if (ata_phys_link_offline(link))
578 goto out;
579
580 /* Link is online. From this point, -ENODEV too is an error. */
581 if (online)
582 *online = true;
583
584 if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
585 /* If PMP is supported, we have to do follow-up SRST.
586 * Some PMPs don't send D2H Reg FIS after hardreset if
587 * the first port is empty. Wait only for
588 * ATA_TMOUT_PMP_SRST_WAIT.
589 */
590 if (check_ready) {
591 unsigned long pmp_deadline;
592
593 pmp_deadline = ata_deadline(jiffies,
594 ATA_TMOUT_PMP_SRST_WAIT);
595 if (time_after(pmp_deadline, deadline))
596 pmp_deadline = deadline;
597 ata_wait_ready(link, pmp_deadline, check_ready);
598 }
599 rc = -EAGAIN;
600 goto out;
601 }
602
603 rc = 0;
604 if (check_ready)
605 rc = ata_wait_ready(link, deadline, check_ready);
606 out:
607 if (rc && rc != -EAGAIN) {
608 /* online is set iff link is online && reset succeeded */
609 if (online)
610 *online = false;
611 ata_link_err(link, "COMRESET failed (errno=%d)\n", rc);
612 }
613 DPRINTK("EXIT, rc=%d\n", rc);
614 return rc;
615}
616EXPORT_SYMBOL_GPL(sata_link_hardreset);
617
618/**
619 * ata_qc_complete_multiple - Complete multiple qcs successfully
620 * @ap: port in question
621 * @qc_active: new qc_active mask
622 *
623 * Complete in-flight commands. This functions is meant to be
624 * called from low-level driver's interrupt routine to complete
625 * requests normally. ap->qc_active and @qc_active is compared
626 * and commands are completed accordingly.
627 *
628 * Always use this function when completing multiple NCQ commands
629 * from IRQ handlers instead of calling ata_qc_complete()
630 * multiple times to keep IRQ expect status properly in sync.
631 *
632 * LOCKING:
633 * spin_lock_irqsave(host lock)
634 *
635 * RETURNS:
636 * Number of completed commands on success, -errno otherwise.
637 */
638int ata_qc_complete_multiple(struct ata_port *ap, u64 qc_active)
639{
640 u64 done_mask, ap_qc_active = ap->qc_active;
641 int nr_done = 0;
642
643 /*
644 * If the internal tag is set on ap->qc_active, then we care about
645 * bit0 on the passed in qc_active mask. Move that bit up to match
646 * the internal tag.
647 */
648 if (ap_qc_active & (1ULL << ATA_TAG_INTERNAL)) {
649 qc_active |= (qc_active & 0x01) << ATA_TAG_INTERNAL;
650 qc_active ^= qc_active & 0x01;
651 }
652
653 done_mask = ap_qc_active ^ qc_active;
654
655 if (unlikely(done_mask & qc_active)) {
656 ata_port_err(ap, "illegal qc_active transition (%08llx->%08llx)\n",
657 ap->qc_active, qc_active);
658 return -EINVAL;
659 }
660
661 while (done_mask) {
662 struct ata_queued_cmd *qc;
663 unsigned int tag = __ffs64(done_mask);
664
665 qc = ata_qc_from_tag(ap, tag);
666 if (qc) {
667 ata_qc_complete(qc);
668 nr_done++;
669 }
670 done_mask &= ~(1ULL << tag);
671 }
672
673 return nr_done;
674}
675EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
676
677/**
678 * ata_slave_link_init - initialize slave link
679 * @ap: port to initialize slave link for
680 *
681 * Create and initialize slave link for @ap. This enables slave
682 * link handling on the port.
683 *
684 * In libata, a port contains links and a link contains devices.
685 * There is single host link but if a PMP is attached to it,
686 * there can be multiple fan-out links. On SATA, there's usually
687 * a single device connected to a link but PATA and SATA
688 * controllers emulating TF based interface can have two - master
689 * and slave.
690 *
691 * However, there are a few controllers which don't fit into this
692 * abstraction too well - SATA controllers which emulate TF
693 * interface with both master and slave devices but also have
694 * separate SCR register sets for each device. These controllers
695 * need separate links for physical link handling
696 * (e.g. onlineness, link speed) but should be treated like a
697 * traditional M/S controller for everything else (e.g. command
698 * issue, softreset).
699 *
700 * slave_link is libata's way of handling this class of
701 * controllers without impacting core layer too much. For
702 * anything other than physical link handling, the default host
703 * link is used for both master and slave. For physical link
704 * handling, separate @ap->slave_link is used. All dirty details
705 * are implemented inside libata core layer. From LLD's POV, the
706 * only difference is that prereset, hardreset and postreset are
707 * called once more for the slave link, so the reset sequence
708 * looks like the following.
709 *
710 * prereset(M) -> prereset(S) -> hardreset(M) -> hardreset(S) ->
711 * softreset(M) -> postreset(M) -> postreset(S)
712 *
713 * Note that softreset is called only for the master. Softreset
714 * resets both M/S by definition, so SRST on master should handle
715 * both (the standard method will work just fine).
716 *
717 * LOCKING:
718 * Should be called before host is registered.
719 *
720 * RETURNS:
721 * 0 on success, -errno on failure.
722 */
723int ata_slave_link_init(struct ata_port *ap)
724{
725 struct ata_link *link;
726
727 WARN_ON(ap->slave_link);
728 WARN_ON(ap->flags & ATA_FLAG_PMP);
729
730 link = kzalloc(sizeof(*link), GFP_KERNEL);
731 if (!link)
732 return -ENOMEM;
733
734 ata_link_init(ap, link, 1);
735 ap->slave_link = link;
736 return 0;
737}
738EXPORT_SYMBOL_GPL(ata_slave_link_init);
739
740/**
741 * sata_lpm_ignore_phy_events - test if PHY event should be ignored
742 * @link: Link receiving the event
743 *
744 * Test whether the received PHY event has to be ignored or not.
745 *
746 * LOCKING:
747 * None:
748 *
749 * RETURNS:
750 * True if the event has to be ignored.
751 */
752bool sata_lpm_ignore_phy_events(struct ata_link *link)
753{
754 unsigned long lpm_timeout = link->last_lpm_change +
755 msecs_to_jiffies(ATA_TMOUT_SPURIOUS_PHY);
756
757 /* if LPM is enabled, PHYRDY doesn't mean anything */
758 if (link->lpm_policy > ATA_LPM_MAX_POWER)
759 return true;
760
761 /* ignore the first PHY event after the LPM policy changed
762 * as it is might be spurious
763 */
764 if ((link->flags & ATA_LFLAG_CHANGED) &&
765 time_before(jiffies, lpm_timeout))
766 return true;
767
768 return false;
769}
770EXPORT_SYMBOL_GPL(sata_lpm_ignore_phy_events);
771
772static const char *ata_lpm_policy_names[] = {
773 [ATA_LPM_UNKNOWN] = "max_performance",
774 [ATA_LPM_MAX_POWER] = "max_performance",
775 [ATA_LPM_MED_POWER] = "medium_power",
776 [ATA_LPM_MED_POWER_WITH_DIPM] = "med_power_with_dipm",
777 [ATA_LPM_MIN_POWER_WITH_PARTIAL] = "min_power_with_partial",
778 [ATA_LPM_MIN_POWER] = "min_power",
779};
780
781static ssize_t ata_scsi_lpm_store(struct device *device,
782 struct device_attribute *attr,
783 const char *buf, size_t count)
784{
785 struct Scsi_Host *shost = class_to_shost(device);
786 struct ata_port *ap = ata_shost_to_port(shost);
787 struct ata_link *link;
788 struct ata_device *dev;
789 enum ata_lpm_policy policy;
790 unsigned long flags;
791
792 /* UNKNOWN is internal state, iterate from MAX_POWER */
793 for (policy = ATA_LPM_MAX_POWER;
794 policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) {
795 const char *name = ata_lpm_policy_names[policy];
796
797 if (strncmp(name, buf, strlen(name)) == 0)
798 break;
799 }
800 if (policy == ARRAY_SIZE(ata_lpm_policy_names))
801 return -EINVAL;
802
803 spin_lock_irqsave(ap->lock, flags);
804
805 ata_for_each_link(link, ap, EDGE) {
806 ata_for_each_dev(dev, &ap->link, ENABLED) {
807 if (dev->horkage & ATA_HORKAGE_NOLPM) {
808 count = -EOPNOTSUPP;
809 goto out_unlock;
810 }
811 }
812 }
813
814 ap->target_lpm_policy = policy;
815 ata_port_schedule_eh(ap);
816out_unlock:
817 spin_unlock_irqrestore(ap->lock, flags);
818 return count;
819}
820
821static ssize_t ata_scsi_lpm_show(struct device *dev,
822 struct device_attribute *attr, char *buf)
823{
824 struct Scsi_Host *shost = class_to_shost(dev);
825 struct ata_port *ap = ata_shost_to_port(shost);
826
827 if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names))
828 return -EINVAL;
829
830 return snprintf(buf, PAGE_SIZE, "%s\n",
831 ata_lpm_policy_names[ap->target_lpm_policy]);
832}
833DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
834 ata_scsi_lpm_show, ata_scsi_lpm_store);
835EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy);
836
837static ssize_t ata_ncq_prio_enable_show(struct device *device,
838 struct device_attribute *attr,
839 char *buf)
840{
841 struct scsi_device *sdev = to_scsi_device(device);
842 struct ata_port *ap;
843 struct ata_device *dev;
844 bool ncq_prio_enable;
845 int rc = 0;
846
847 ap = ata_shost_to_port(sdev->host);
848
849 spin_lock_irq(ap->lock);
850 dev = ata_scsi_find_dev(ap, sdev);
851 if (!dev) {
852 rc = -ENODEV;
853 goto unlock;
854 }
855
856 ncq_prio_enable = dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLE;
857
858unlock:
859 spin_unlock_irq(ap->lock);
860
861 return rc ? rc : snprintf(buf, 20, "%u\n", ncq_prio_enable);
862}
863
864static ssize_t ata_ncq_prio_enable_store(struct device *device,
865 struct device_attribute *attr,
866 const char *buf, size_t len)
867{
868 struct scsi_device *sdev = to_scsi_device(device);
869 struct ata_port *ap;
870 struct ata_device *dev;
871 long int input;
872 int rc;
873
874 rc = kstrtol(buf, 10, &input);
875 if (rc)
876 return rc;
877 if ((input < 0) || (input > 1))
878 return -EINVAL;
879
880 ap = ata_shost_to_port(sdev->host);
881 dev = ata_scsi_find_dev(ap, sdev);
882 if (unlikely(!dev))
883 return -ENODEV;
884
885 spin_lock_irq(ap->lock);
886 if (input)
887 dev->flags |= ATA_DFLAG_NCQ_PRIO_ENABLE;
888 else
889 dev->flags &= ~ATA_DFLAG_NCQ_PRIO_ENABLE;
890
891 dev->link->eh_info.action |= ATA_EH_REVALIDATE;
892 dev->link->eh_info.flags |= ATA_EHI_QUIET;
893 ata_port_schedule_eh(ap);
894 spin_unlock_irq(ap->lock);
895
896 ata_port_wait_eh(ap);
897
898 if (input) {
899 spin_lock_irq(ap->lock);
900 if (!(dev->flags & ATA_DFLAG_NCQ_PRIO)) {
901 dev->flags &= ~ATA_DFLAG_NCQ_PRIO_ENABLE;
902 rc = -EIO;
903 }
904 spin_unlock_irq(ap->lock);
905 }
906
907 return rc ? rc : len;
908}
909
910DEVICE_ATTR(ncq_prio_enable, S_IRUGO | S_IWUSR,
911 ata_ncq_prio_enable_show, ata_ncq_prio_enable_store);
912EXPORT_SYMBOL_GPL(dev_attr_ncq_prio_enable);
913
914struct device_attribute *ata_ncq_sdev_attrs[] = {
915 &dev_attr_unload_heads,
916 &dev_attr_ncq_prio_enable,
917 NULL
918};
919EXPORT_SYMBOL_GPL(ata_ncq_sdev_attrs);
920
921static ssize_t
922ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr,
923 const char *buf, size_t count)
924{
925 struct Scsi_Host *shost = class_to_shost(dev);
926 struct ata_port *ap = ata_shost_to_port(shost);
927 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM))
928 return ap->ops->em_store(ap, buf, count);
929 return -EINVAL;
930}
931
932static ssize_t
933ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr,
934 char *buf)
935{
936 struct Scsi_Host *shost = class_to_shost(dev);
937 struct ata_port *ap = ata_shost_to_port(shost);
938
939 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM))
940 return ap->ops->em_show(ap, buf);
941 return -EINVAL;
942}
943DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR,
944 ata_scsi_em_message_show, ata_scsi_em_message_store);
945EXPORT_SYMBOL_GPL(dev_attr_em_message);
946
947static ssize_t
948ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr,
949 char *buf)
950{
951 struct Scsi_Host *shost = class_to_shost(dev);
952 struct ata_port *ap = ata_shost_to_port(shost);
953
954 return snprintf(buf, 23, "%d\n", ap->em_message_type);
955}
956DEVICE_ATTR(em_message_type, S_IRUGO,
957 ata_scsi_em_message_type_show, NULL);
958EXPORT_SYMBOL_GPL(dev_attr_em_message_type);
959
960static ssize_t
961ata_scsi_activity_show(struct device *dev, struct device_attribute *attr,
962 char *buf)
963{
964 struct scsi_device *sdev = to_scsi_device(dev);
965 struct ata_port *ap = ata_shost_to_port(sdev->host);
966 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
967
968 if (atadev && ap->ops->sw_activity_show &&
969 (ap->flags & ATA_FLAG_SW_ACTIVITY))
970 return ap->ops->sw_activity_show(atadev, buf);
971 return -EINVAL;
972}
973
974static ssize_t
975ata_scsi_activity_store(struct device *dev, struct device_attribute *attr,
976 const char *buf, size_t count)
977{
978 struct scsi_device *sdev = to_scsi_device(dev);
979 struct ata_port *ap = ata_shost_to_port(sdev->host);
980 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
981 enum sw_activity val;
982 int rc;
983
984 if (atadev && ap->ops->sw_activity_store &&
985 (ap->flags & ATA_FLAG_SW_ACTIVITY)) {
986 val = simple_strtoul(buf, NULL, 0);
987 switch (val) {
988 case OFF: case BLINK_ON: case BLINK_OFF:
989 rc = ap->ops->sw_activity_store(atadev, val);
990 if (!rc)
991 return count;
992 else
993 return rc;
994 }
995 }
996 return -EINVAL;
997}
998DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show,
999 ata_scsi_activity_store);
1000EXPORT_SYMBOL_GPL(dev_attr_sw_activity);
1001
1002/**
1003 * __ata_change_queue_depth - helper for ata_scsi_change_queue_depth
1004 * @ap: ATA port to which the device change the queue depth
1005 * @sdev: SCSI device to configure queue depth for
1006 * @queue_depth: new queue depth
1007 *
1008 * libsas and libata have different approaches for associating a sdev to
1009 * its ata_port.
1010 *
1011 */
1012int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev,
1013 int queue_depth)
1014{
1015 struct ata_device *dev;
1016 unsigned long flags;
1017
1018 if (queue_depth < 1 || queue_depth == sdev->queue_depth)
1019 return sdev->queue_depth;
1020
1021 dev = ata_scsi_find_dev(ap, sdev);
1022 if (!dev || !ata_dev_enabled(dev))
1023 return sdev->queue_depth;
1024
1025 /* NCQ enabled? */
1026 spin_lock_irqsave(ap->lock, flags);
1027 dev->flags &= ~ATA_DFLAG_NCQ_OFF;
1028 if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
1029 dev->flags |= ATA_DFLAG_NCQ_OFF;
1030 queue_depth = 1;
1031 }
1032 spin_unlock_irqrestore(ap->lock, flags);
1033
1034 /* limit and apply queue depth */
1035 queue_depth = min(queue_depth, sdev->host->can_queue);
1036 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
1037 queue_depth = min(queue_depth, ATA_MAX_QUEUE);
1038
1039 if (sdev->queue_depth == queue_depth)
1040 return -EINVAL;
1041
1042 return scsi_change_queue_depth(sdev, queue_depth);
1043}
1044EXPORT_SYMBOL_GPL(__ata_change_queue_depth);
1045
1046/**
1047 * ata_scsi_change_queue_depth - SCSI callback for queue depth config
1048 * @sdev: SCSI device to configure queue depth for
1049 * @queue_depth: new queue depth
1050 *
1051 * This is libata standard hostt->change_queue_depth callback.
1052 * SCSI will call into this callback when user tries to set queue
1053 * depth via sysfs.
1054 *
1055 * LOCKING:
1056 * SCSI layer (we don't care)
1057 *
1058 * RETURNS:
1059 * Newly configured queue depth.
1060 */
1061int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
1062{
1063 struct ata_port *ap = ata_shost_to_port(sdev->host);
1064
1065 return __ata_change_queue_depth(ap, sdev, queue_depth);
1066}
1067EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
1068
1069/**
1070 * port_alloc - Allocate port for a SAS attached SATA device
1071 * @host: ATA host container for all SAS ports
1072 * @port_info: Information from low-level host driver
1073 * @shost: SCSI host that the scsi device is attached to
1074 *
1075 * LOCKING:
1076 * PCI/etc. bus probe sem.
1077 *
1078 * RETURNS:
1079 * ata_port pointer on success / NULL on failure.
1080 */
1081
1082struct ata_port *ata_sas_port_alloc(struct ata_host *host,
1083 struct ata_port_info *port_info,
1084 struct Scsi_Host *shost)
1085{
1086 struct ata_port *ap;
1087
1088 ap = ata_port_alloc(host);
1089 if (!ap)
1090 return NULL;
1091
1092 ap->port_no = 0;
1093 ap->lock = &host->lock;
1094 ap->pio_mask = port_info->pio_mask;
1095 ap->mwdma_mask = port_info->mwdma_mask;
1096 ap->udma_mask = port_info->udma_mask;
1097 ap->flags |= port_info->flags;
1098 ap->ops = port_info->port_ops;
1099 ap->cbl = ATA_CBL_SATA;
1100
1101 return ap;
1102}
1103EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
1104
1105/**
1106 * ata_sas_port_start - Set port up for dma.
1107 * @ap: Port to initialize
1108 *
1109 * Called just after data structures for each port are
1110 * initialized.
1111 *
1112 * May be used as the port_start() entry in ata_port_operations.
1113 *
1114 * LOCKING:
1115 * Inherited from caller.
1116 */
1117int ata_sas_port_start(struct ata_port *ap)
1118{
1119 /*
1120 * the port is marked as frozen at allocation time, but if we don't
1121 * have new eh, we won't thaw it
1122 */
1123 if (!ap->ops->error_handler)
1124 ap->pflags &= ~ATA_PFLAG_FROZEN;
1125 return 0;
1126}
1127EXPORT_SYMBOL_GPL(ata_sas_port_start);
1128
1129/**
1130 * ata_port_stop - Undo ata_sas_port_start()
1131 * @ap: Port to shut down
1132 *
1133 * May be used as the port_stop() entry in ata_port_operations.
1134 *
1135 * LOCKING:
1136 * Inherited from caller.
1137 */
1138
1139void ata_sas_port_stop(struct ata_port *ap)
1140{
1141}
1142EXPORT_SYMBOL_GPL(ata_sas_port_stop);
1143
1144/**
1145 * ata_sas_async_probe - simply schedule probing and return
1146 * @ap: Port to probe
1147 *
1148 * For batch scheduling of probe for sas attached ata devices, assumes
1149 * the port has already been through ata_sas_port_init()
1150 */
1151void ata_sas_async_probe(struct ata_port *ap)
1152{
1153 __ata_port_probe(ap);
1154}
1155EXPORT_SYMBOL_GPL(ata_sas_async_probe);
1156
1157int ata_sas_sync_probe(struct ata_port *ap)
1158{
1159 return ata_port_probe(ap);
1160}
1161EXPORT_SYMBOL_GPL(ata_sas_sync_probe);
1162
1163
1164/**
1165 * ata_sas_port_init - Initialize a SATA device
1166 * @ap: SATA port to initialize
1167 *
1168 * LOCKING:
1169 * PCI/etc. bus probe sem.
1170 *
1171 * RETURNS:
1172 * Zero on success, non-zero on error.
1173 */
1174
1175int ata_sas_port_init(struct ata_port *ap)
1176{
1177 int rc = ap->ops->port_start(ap);
1178
1179 if (rc)
1180 return rc;
1181 ap->print_id = atomic_inc_return(&ata_print_id);
1182 return 0;
1183}
1184EXPORT_SYMBOL_GPL(ata_sas_port_init);
1185
1186int ata_sas_tport_add(struct device *parent, struct ata_port *ap)
1187{
1188 return ata_tport_add(parent, ap);
1189}
1190EXPORT_SYMBOL_GPL(ata_sas_tport_add);
1191
1192void ata_sas_tport_delete(struct ata_port *ap)
1193{
1194 ata_tport_delete(ap);
1195}
1196EXPORT_SYMBOL_GPL(ata_sas_tport_delete);
1197
1198/**
1199 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
1200 * @ap: SATA port to destroy
1201 *
1202 */
1203
1204void ata_sas_port_destroy(struct ata_port *ap)
1205{
1206 if (ap->ops->port_stop)
1207 ap->ops->port_stop(ap);
1208 kfree(ap);
1209}
1210EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
1211
1212/**
1213 * ata_sas_slave_configure - Default slave_config routine for libata devices
1214 * @sdev: SCSI device to configure
1215 * @ap: ATA port to which SCSI device is attached
1216 *
1217 * RETURNS:
1218 * Zero.
1219 */
1220
1221int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
1222{
1223 ata_scsi_sdev_config(sdev);
1224 ata_scsi_dev_config(sdev, ap->link.device);
1225 return 0;
1226}
1227EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
1228
1229/**
1230 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
1231 * @cmd: SCSI command to be sent
1232 * @ap: ATA port to which the command is being sent
1233 *
1234 * RETURNS:
1235 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
1236 * 0 otherwise.
1237 */
1238
1239int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap)
1240{
1241 int rc = 0;
1242
1243 ata_scsi_dump_cdb(ap, cmd);
1244
1245 if (likely(ata_dev_enabled(ap->link.device)))
1246 rc = __ata_scsi_queuecmd(cmd, ap->link.device);
1247 else {
1248 cmd->result = (DID_BAD_TARGET << 16);
1249 cmd->scsi_done(cmd);
1250 }
1251 return rc;
1252}
1253EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
1254
1255int ata_sas_allocate_tag(struct ata_port *ap)
1256{
1257 unsigned int max_queue = ap->host->n_tags;
1258 unsigned int i, tag;
1259
1260 for (i = 0, tag = ap->sas_last_tag + 1; i < max_queue; i++, tag++) {
1261 tag = tag < max_queue ? tag : 0;
1262
1263 /* the last tag is reserved for internal command. */
1264 if (ata_tag_internal(tag))
1265 continue;
1266
1267 if (!test_and_set_bit(tag, &ap->sas_tag_allocated)) {
1268 ap->sas_last_tag = tag;
1269 return tag;
1270 }
1271 }
1272 return -1;
1273}
1274
1275void ata_sas_free_tag(unsigned int tag, struct ata_port *ap)
1276{
1277 clear_bit(tag, &ap->sas_tag_allocated);
1278}
1279
1280/**
1281 * sata_async_notification - SATA async notification handler
1282 * @ap: ATA port where async notification is received
1283 *
1284 * Handler to be called when async notification via SDB FIS is
1285 * received. This function schedules EH if necessary.
1286 *
1287 * LOCKING:
1288 * spin_lock_irqsave(host lock)
1289 *
1290 * RETURNS:
1291 * 1 if EH is scheduled, 0 otherwise.
1292 */
1293int sata_async_notification(struct ata_port *ap)
1294{
1295 u32 sntf;
1296 int rc;
1297
1298 if (!(ap->flags & ATA_FLAG_AN))
1299 return 0;
1300
1301 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
1302 if (rc == 0)
1303 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
1304
1305 if (!sata_pmp_attached(ap) || rc) {
1306 /* PMP is not attached or SNTF is not available */
1307 if (!sata_pmp_attached(ap)) {
1308 /* PMP is not attached. Check whether ATAPI
1309 * AN is configured. If so, notify media
1310 * change.
1311 */
1312 struct ata_device *dev = ap->link.device;
1313
1314 if ((dev->class == ATA_DEV_ATAPI) &&
1315 (dev->flags & ATA_DFLAG_AN))
1316 ata_scsi_media_change_notify(dev);
1317 return 0;
1318 } else {
1319 /* PMP is attached but SNTF is not available.
1320 * ATAPI async media change notification is
1321 * not used. The PMP must be reporting PHY
1322 * status change, schedule EH.
1323 */
1324 ata_port_schedule_eh(ap);
1325 return 1;
1326 }
1327 } else {
1328 /* PMP is attached and SNTF is available */
1329 struct ata_link *link;
1330
1331 /* check and notify ATAPI AN */
1332 ata_for_each_link(link, ap, EDGE) {
1333 if (!(sntf & (1 << link->pmp)))
1334 continue;
1335
1336 if ((link->device->class == ATA_DEV_ATAPI) &&
1337 (link->device->flags & ATA_DFLAG_AN))
1338 ata_scsi_media_change_notify(link->device);
1339 }
1340
1341 /* If PMP is reporting that PHY status of some
1342 * downstream ports has changed, schedule EH.
1343 */
1344 if (sntf & (1 << SATA_PMP_CTRL_PORT)) {
1345 ata_port_schedule_eh(ap);
1346 return 1;
1347 }
1348
1349 return 0;
1350 }
1351}
1352EXPORT_SYMBOL_GPL(sata_async_notification);
1353
1354/**
1355 * ata_eh_read_log_10h - Read log page 10h for NCQ error details
1356 * @dev: Device to read log page 10h from
1357 * @tag: Resulting tag of the failed command
1358 * @tf: Resulting taskfile registers of the failed command
1359 *
1360 * Read log page 10h to obtain NCQ error details and clear error
1361 * condition.
1362 *
1363 * LOCKING:
1364 * Kernel thread context (may sleep).
1365 *
1366 * RETURNS:
1367 * 0 on success, -errno otherwise.
1368 */
1369static int ata_eh_read_log_10h(struct ata_device *dev,
1370 int *tag, struct ata_taskfile *tf)
1371{
1372 u8 *buf = dev->link->ap->sector_buf;
1373 unsigned int err_mask;
1374 u8 csum;
1375 int i;
1376
1377 err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, 0, buf, 1);
1378 if (err_mask)
1379 return -EIO;
1380
1381 csum = 0;
1382 for (i = 0; i < ATA_SECT_SIZE; i++)
1383 csum += buf[i];
1384 if (csum)
1385 ata_dev_warn(dev, "invalid checksum 0x%x on log page 10h\n",
1386 csum);
1387
1388 if (buf[0] & 0x80)
1389 return -ENOENT;
1390
1391 *tag = buf[0] & 0x1f;
1392
1393 tf->command = buf[2];
1394 tf->feature = buf[3];
1395 tf->lbal = buf[4];
1396 tf->lbam = buf[5];
1397 tf->lbah = buf[6];
1398 tf->device = buf[7];
1399 tf->hob_lbal = buf[8];
1400 tf->hob_lbam = buf[9];
1401 tf->hob_lbah = buf[10];
1402 tf->nsect = buf[12];
1403 tf->hob_nsect = buf[13];
1404 if (dev->class == ATA_DEV_ZAC && ata_id_has_ncq_autosense(dev->id))
1405 tf->auxiliary = buf[14] << 16 | buf[15] << 8 | buf[16];
1406
1407 return 0;
1408}
1409
1410/**
1411 * ata_eh_analyze_ncq_error - analyze NCQ error
1412 * @link: ATA link to analyze NCQ error for
1413 *
1414 * Read log page 10h, determine the offending qc and acquire
1415 * error status TF. For NCQ device errors, all LLDDs have to do
1416 * is setting AC_ERR_DEV in ehi->err_mask. This function takes
1417 * care of the rest.
1418 *
1419 * LOCKING:
1420 * Kernel thread context (may sleep).
1421 */
1422void ata_eh_analyze_ncq_error(struct ata_link *link)
1423{
1424 struct ata_port *ap = link->ap;
1425 struct ata_eh_context *ehc = &link->eh_context;
1426 struct ata_device *dev = link->device;
1427 struct ata_queued_cmd *qc;
1428 struct ata_taskfile tf;
1429 int tag, rc;
1430
1431 /* if frozen, we can't do much */
1432 if (ap->pflags & ATA_PFLAG_FROZEN)
1433 return;
1434
1435 /* is it NCQ device error? */
1436 if (!link->sactive || !(ehc->i.err_mask & AC_ERR_DEV))
1437 return;
1438
1439 /* has LLDD analyzed already? */
1440 ata_qc_for_each_raw(ap, qc, tag) {
1441 if (!(qc->flags & ATA_QCFLAG_FAILED))
1442 continue;
1443
1444 if (qc->err_mask)
1445 return;
1446 }
1447
1448 /* okay, this error is ours */
1449 memset(&tf, 0, sizeof(tf));
1450 rc = ata_eh_read_log_10h(dev, &tag, &tf);
1451 if (rc) {
1452 ata_link_err(link, "failed to read log page 10h (errno=%d)\n",
1453 rc);
1454 return;
1455 }
1456
1457 if (!(link->sactive & (1 << tag))) {
1458 ata_link_err(link, "log page 10h reported inactive tag %d\n",
1459 tag);
1460 return;
1461 }
1462
1463 /* we've got the perpetrator, condemn it */
1464 qc = __ata_qc_from_tag(ap, tag);
1465 memcpy(&qc->result_tf, &tf, sizeof(tf));
1466 qc->result_tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
1467 qc->err_mask |= AC_ERR_DEV | AC_ERR_NCQ;
1468 if (dev->class == ATA_DEV_ZAC &&
1469 ((qc->result_tf.command & ATA_SENSE) || qc->result_tf.auxiliary)) {
1470 char sense_key, asc, ascq;
1471
1472 sense_key = (qc->result_tf.auxiliary >> 16) & 0xff;
1473 asc = (qc->result_tf.auxiliary >> 8) & 0xff;
1474 ascq = qc->result_tf.auxiliary & 0xff;
1475 ata_scsi_set_sense(dev, qc->scsicmd, sense_key, asc, ascq);
1476 ata_scsi_set_sense_information(dev, qc->scsicmd,
1477 &qc->result_tf);
1478 qc->flags |= ATA_QCFLAG_SENSE_VALID;
1479 }
1480
1481 ehc->i.err_mask &= ~AC_ERR_DEV;
1482}
1483EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error);