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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 <scsi/scsi_eh.h>
15#include <linux/libata.h>
16#include <asm/unaligned.h>
17
18#include "libata.h"
19#include "libata-transport.h"
20
21/* debounce timing parameters in msecs { interval, duration, timeout } */
22const unsigned int sata_deb_timing_normal[] = { 5, 100, 2000 };
23EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
24const unsigned int sata_deb_timing_hotplug[] = { 25, 500, 2000 };
25EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
26const unsigned int sata_deb_timing_long[] = { 100, 2000, 5000 };
27EXPORT_SYMBOL_GPL(sata_deb_timing_long);
28
29/**
30 * sata_scr_valid - test whether SCRs are accessible
31 * @link: ATA link to test SCR accessibility for
32 *
33 * Test whether SCRs are accessible for @link.
34 *
35 * LOCKING:
36 * None.
37 *
38 * RETURNS:
39 * 1 if SCRs are accessible, 0 otherwise.
40 */
41int sata_scr_valid(struct ata_link *link)
42{
43 struct ata_port *ap = link->ap;
44
45 return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
46}
47EXPORT_SYMBOL_GPL(sata_scr_valid);
48
49/**
50 * sata_scr_read - read SCR register of the specified port
51 * @link: ATA link to read SCR for
52 * @reg: SCR to read
53 * @val: Place to store read value
54 *
55 * Read SCR register @reg of @link into *@val. This function is
56 * guaranteed to succeed if @link is ap->link, the cable type of
57 * the port is SATA and the port implements ->scr_read.
58 *
59 * LOCKING:
60 * None if @link is ap->link. Kernel thread context otherwise.
61 *
62 * RETURNS:
63 * 0 on success, negative errno on failure.
64 */
65int sata_scr_read(struct ata_link *link, int reg, u32 *val)
66{
67 if (ata_is_host_link(link)) {
68 if (sata_scr_valid(link))
69 return link->ap->ops->scr_read(link, reg, val);
70 return -EOPNOTSUPP;
71 }
72
73 return sata_pmp_scr_read(link, reg, val);
74}
75EXPORT_SYMBOL_GPL(sata_scr_read);
76
77/**
78 * sata_scr_write - write SCR register of the specified port
79 * @link: ATA link to write SCR for
80 * @reg: SCR to write
81 * @val: value to write
82 *
83 * Write @val to SCR register @reg of @link. This function is
84 * guaranteed to succeed if @link is ap->link, the cable type of
85 * the port is SATA and the port implements ->scr_read.
86 *
87 * LOCKING:
88 * None if @link is ap->link. Kernel thread context otherwise.
89 *
90 * RETURNS:
91 * 0 on success, negative errno on failure.
92 */
93int sata_scr_write(struct ata_link *link, int reg, u32 val)
94{
95 if (ata_is_host_link(link)) {
96 if (sata_scr_valid(link))
97 return link->ap->ops->scr_write(link, reg, val);
98 return -EOPNOTSUPP;
99 }
100
101 return sata_pmp_scr_write(link, reg, val);
102}
103EXPORT_SYMBOL_GPL(sata_scr_write);
104
105/**
106 * sata_scr_write_flush - write SCR register of the specified port and flush
107 * @link: ATA link to write SCR for
108 * @reg: SCR to write
109 * @val: value to write
110 *
111 * This function is identical to sata_scr_write() except that this
112 * function performs flush after writing to the register.
113 *
114 * LOCKING:
115 * None if @link is ap->link. Kernel thread context otherwise.
116 *
117 * RETURNS:
118 * 0 on success, negative errno on failure.
119 */
120int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
121{
122 if (ata_is_host_link(link)) {
123 int rc;
124
125 if (sata_scr_valid(link)) {
126 rc = link->ap->ops->scr_write(link, reg, val);
127 if (rc == 0)
128 rc = link->ap->ops->scr_read(link, reg, &val);
129 return rc;
130 }
131 return -EOPNOTSUPP;
132 }
133
134 return sata_pmp_scr_write(link, reg, val);
135}
136EXPORT_SYMBOL_GPL(sata_scr_write_flush);
137
138/**
139 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
140 * @tf: Taskfile to convert
141 * @pmp: Port multiplier port
142 * @is_cmd: This FIS is for command
143 * @fis: Buffer into which data will output
144 *
145 * Converts a standard ATA taskfile to a Serial ATA
146 * FIS structure (Register - Host to Device).
147 *
148 * LOCKING:
149 * Inherited from caller.
150 */
151void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
152{
153 fis[0] = 0x27; /* Register - Host to Device FIS */
154 fis[1] = pmp & 0xf; /* Port multiplier number*/
155 if (is_cmd)
156 fis[1] |= (1 << 7); /* bit 7 indicates Command FIS */
157
158 fis[2] = tf->command;
159 fis[3] = tf->feature;
160
161 fis[4] = tf->lbal;
162 fis[5] = tf->lbam;
163 fis[6] = tf->lbah;
164 fis[7] = tf->device;
165
166 fis[8] = tf->hob_lbal;
167 fis[9] = tf->hob_lbam;
168 fis[10] = tf->hob_lbah;
169 fis[11] = tf->hob_feature;
170
171 fis[12] = tf->nsect;
172 fis[13] = tf->hob_nsect;
173 fis[14] = 0;
174 fis[15] = tf->ctl;
175
176 fis[16] = tf->auxiliary & 0xff;
177 fis[17] = (tf->auxiliary >> 8) & 0xff;
178 fis[18] = (tf->auxiliary >> 16) & 0xff;
179 fis[19] = (tf->auxiliary >> 24) & 0xff;
180}
181EXPORT_SYMBOL_GPL(ata_tf_to_fis);
182
183/**
184 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
185 * @fis: Buffer from which data will be input
186 * @tf: Taskfile to output
187 *
188 * Converts a serial ATA FIS structure to a standard ATA taskfile.
189 *
190 * LOCKING:
191 * Inherited from caller.
192 */
193
194void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
195{
196 tf->status = fis[2];
197 tf->error = fis[3];
198
199 tf->lbal = fis[4];
200 tf->lbam = fis[5];
201 tf->lbah = fis[6];
202 tf->device = fis[7];
203
204 tf->hob_lbal = fis[8];
205 tf->hob_lbam = fis[9];
206 tf->hob_lbah = fis[10];
207
208 tf->nsect = fis[12];
209 tf->hob_nsect = fis[13];
210}
211EXPORT_SYMBOL_GPL(ata_tf_from_fis);
212
213/**
214 * sata_link_debounce - debounce SATA phy status
215 * @link: ATA link to debounce SATA phy status for
216 * @params: timing parameters { interval, duration, timeout } in msec
217 * @deadline: deadline jiffies for the operation
218 *
219 * Make sure SStatus of @link reaches stable state, determined by
220 * holding the same value where DET is not 1 for @duration polled
221 * every @interval, before @timeout. Timeout constraints the
222 * beginning of the stable state. Because DET gets stuck at 1 on
223 * some controllers after hot unplugging, this functions waits
224 * until timeout then returns 0 if DET is stable at 1.
225 *
226 * @timeout is further limited by @deadline. The sooner of the
227 * two is used.
228 *
229 * LOCKING:
230 * Kernel thread context (may sleep)
231 *
232 * RETURNS:
233 * 0 on success, -errno on failure.
234 */
235int sata_link_debounce(struct ata_link *link, const unsigned int *params,
236 unsigned long deadline)
237{
238 unsigned int interval = params[0];
239 unsigned int duration = params[1];
240 unsigned long last_jiffies, t;
241 u32 last, cur;
242 int rc;
243
244 t = ata_deadline(jiffies, params[2]);
245 if (time_before(t, deadline))
246 deadline = t;
247
248 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
249 return rc;
250 cur &= 0xf;
251
252 last = cur;
253 last_jiffies = jiffies;
254
255 while (1) {
256 ata_msleep(link->ap, interval);
257 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
258 return rc;
259 cur &= 0xf;
260
261 /* DET stable? */
262 if (cur == last) {
263 if (cur == 1 && time_before(jiffies, deadline))
264 continue;
265 if (time_after(jiffies,
266 ata_deadline(last_jiffies, duration)))
267 return 0;
268 continue;
269 }
270
271 /* unstable, start over */
272 last = cur;
273 last_jiffies = jiffies;
274
275 /* Check deadline. If debouncing failed, return
276 * -EPIPE to tell upper layer to lower link speed.
277 */
278 if (time_after(jiffies, deadline))
279 return -EPIPE;
280 }
281}
282EXPORT_SYMBOL_GPL(sata_link_debounce);
283
284/**
285 * sata_link_resume - resume SATA link
286 * @link: ATA link to resume SATA
287 * @params: timing parameters { interval, duration, timeout } in msec
288 * @deadline: deadline jiffies for the operation
289 *
290 * Resume SATA phy @link and debounce it.
291 *
292 * LOCKING:
293 * Kernel thread context (may sleep)
294 *
295 * RETURNS:
296 * 0 on success, -errno on failure.
297 */
298int sata_link_resume(struct ata_link *link, const unsigned int *params,
299 unsigned long deadline)
300{
301 int tries = ATA_LINK_RESUME_TRIES;
302 u32 scontrol, serror;
303 int rc;
304
305 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
306 return rc;
307
308 /*
309 * Writes to SControl sometimes get ignored under certain
310 * controllers (ata_piix SIDPR). Make sure DET actually is
311 * cleared.
312 */
313 do {
314 scontrol = (scontrol & 0x0f0) | 0x300;
315 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
316 return rc;
317 /*
318 * Some PHYs react badly if SStatus is pounded
319 * immediately after resuming. Delay 200ms before
320 * debouncing.
321 */
322 if (!(link->flags & ATA_LFLAG_NO_DEBOUNCE_DELAY))
323 ata_msleep(link->ap, 200);
324
325 /* is SControl restored correctly? */
326 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
327 return rc;
328 } while ((scontrol & 0xf0f) != 0x300 && --tries);
329
330 if ((scontrol & 0xf0f) != 0x300) {
331 ata_link_warn(link, "failed to resume link (SControl %X)\n",
332 scontrol);
333 return 0;
334 }
335
336 if (tries < ATA_LINK_RESUME_TRIES)
337 ata_link_warn(link, "link resume succeeded after %d retries\n",
338 ATA_LINK_RESUME_TRIES - tries);
339
340 if ((rc = sata_link_debounce(link, params, deadline)))
341 return rc;
342
343 /* clear SError, some PHYs require this even for SRST to work */
344 if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
345 rc = sata_scr_write(link, SCR_ERROR, serror);
346
347 return rc != -EINVAL ? rc : 0;
348}
349EXPORT_SYMBOL_GPL(sata_link_resume);
350
351/**
352 * sata_link_scr_lpm - manipulate SControl IPM and SPM fields
353 * @link: ATA link to manipulate SControl for
354 * @policy: LPM policy to configure
355 * @spm_wakeup: initiate LPM transition to active state
356 *
357 * Manipulate the IPM field of the SControl register of @link
358 * according to @policy. If @policy is ATA_LPM_MAX_POWER and
359 * @spm_wakeup is %true, the SPM field is manipulated to wake up
360 * the link. This function also clears PHYRDY_CHG before
361 * returning.
362 *
363 * LOCKING:
364 * EH context.
365 *
366 * RETURNS:
367 * 0 on success, -errno otherwise.
368 */
369int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
370 bool spm_wakeup)
371{
372 struct ata_eh_context *ehc = &link->eh_context;
373 bool woken_up = false;
374 u32 scontrol;
375 int rc;
376
377 rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
378 if (rc)
379 return rc;
380
381 switch (policy) {
382 case ATA_LPM_MAX_POWER:
383 /* disable all LPM transitions */
384 scontrol |= (0x7 << 8);
385 /* initiate transition to active state */
386 if (spm_wakeup) {
387 scontrol |= (0x4 << 12);
388 woken_up = true;
389 }
390 break;
391 case ATA_LPM_MED_POWER:
392 /* allow LPM to PARTIAL */
393 scontrol &= ~(0x1 << 8);
394 scontrol |= (0x6 << 8);
395 break;
396 case ATA_LPM_MED_POWER_WITH_DIPM:
397 case ATA_LPM_MIN_POWER_WITH_PARTIAL:
398 case ATA_LPM_MIN_POWER:
399 if (ata_link_nr_enabled(link) > 0) {
400 /* assume no restrictions on LPM transitions */
401 scontrol &= ~(0x7 << 8);
402
403 /*
404 * If the controller does not support partial, slumber,
405 * or devsleep, then disallow these transitions.
406 */
407 if (link->ap->host->flags & ATA_HOST_NO_PART)
408 scontrol |= (0x1 << 8);
409
410 if (link->ap->host->flags & ATA_HOST_NO_SSC)
411 scontrol |= (0x2 << 8);
412
413 if (link->ap->host->flags & ATA_HOST_NO_DEVSLP)
414 scontrol |= (0x4 << 8);
415 } else {
416 /* empty port, power off */
417 scontrol &= ~0xf;
418 scontrol |= (0x1 << 2);
419 }
420 break;
421 default:
422 WARN_ON(1);
423 }
424
425 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
426 if (rc)
427 return rc;
428
429 /* give the link time to transit out of LPM state */
430 if (woken_up)
431 msleep(10);
432
433 /* clear PHYRDY_CHG from SError */
434 ehc->i.serror &= ~SERR_PHYRDY_CHG;
435 return sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
436}
437EXPORT_SYMBOL_GPL(sata_link_scr_lpm);
438
439static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
440{
441 struct ata_link *host_link = &link->ap->link;
442 u32 limit, target, spd;
443
444 limit = link->sata_spd_limit;
445
446 /* Don't configure downstream link faster than upstream link.
447 * It doesn't speed up anything and some PMPs choke on such
448 * configuration.
449 */
450 if (!ata_is_host_link(link) && host_link->sata_spd)
451 limit &= (1 << host_link->sata_spd) - 1;
452
453 if (limit == UINT_MAX)
454 target = 0;
455 else
456 target = fls(limit);
457
458 spd = (*scontrol >> 4) & 0xf;
459 *scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
460
461 return spd != target;
462}
463
464/**
465 * sata_set_spd_needed - is SATA spd configuration needed
466 * @link: Link in question
467 *
468 * Test whether the spd limit in SControl matches
469 * @link->sata_spd_limit. This function is used to determine
470 * whether hardreset is necessary to apply SATA spd
471 * configuration.
472 *
473 * LOCKING:
474 * Inherited from caller.
475 *
476 * RETURNS:
477 * 1 if SATA spd configuration is needed, 0 otherwise.
478 */
479static int sata_set_spd_needed(struct ata_link *link)
480{
481 u32 scontrol;
482
483 if (sata_scr_read(link, SCR_CONTROL, &scontrol))
484 return 1;
485
486 return __sata_set_spd_needed(link, &scontrol);
487}
488
489/**
490 * sata_set_spd - set SATA spd according to spd limit
491 * @link: Link to set SATA spd for
492 *
493 * Set SATA spd of @link according to sata_spd_limit.
494 *
495 * LOCKING:
496 * Inherited from caller.
497 *
498 * RETURNS:
499 * 0 if spd doesn't need to be changed, 1 if spd has been
500 * changed. Negative errno if SCR registers are inaccessible.
501 */
502int sata_set_spd(struct ata_link *link)
503{
504 u32 scontrol;
505 int rc;
506
507 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
508 return rc;
509
510 if (!__sata_set_spd_needed(link, &scontrol))
511 return 0;
512
513 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
514 return rc;
515
516 return 1;
517}
518EXPORT_SYMBOL_GPL(sata_set_spd);
519
520/**
521 * sata_link_hardreset - reset link via SATA phy reset
522 * @link: link to reset
523 * @timing: timing parameters { interval, duration, timeout } in msec
524 * @deadline: deadline jiffies for the operation
525 * @online: optional out parameter indicating link onlineness
526 * @check_ready: optional callback to check link readiness
527 *
528 * SATA phy-reset @link using DET bits of SControl register.
529 * After hardreset, link readiness is waited upon using
530 * ata_wait_ready() if @check_ready is specified. LLDs are
531 * allowed to not specify @check_ready and wait itself after this
532 * function returns. Device classification is LLD's
533 * responsibility.
534 *
535 * *@online is set to one iff reset succeeded and @link is online
536 * after reset.
537 *
538 * LOCKING:
539 * Kernel thread context (may sleep)
540 *
541 * RETURNS:
542 * 0 on success, -errno otherwise.
543 */
544int sata_link_hardreset(struct ata_link *link, const unsigned int *timing,
545 unsigned long deadline,
546 bool *online, int (*check_ready)(struct ata_link *))
547{
548 u32 scontrol;
549 int rc;
550
551 if (online)
552 *online = false;
553
554 if (sata_set_spd_needed(link)) {
555 /* SATA spec says nothing about how to reconfigure
556 * spd. To be on the safe side, turn off phy during
557 * reconfiguration. This works for at least ICH7 AHCI
558 * and Sil3124.
559 */
560 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
561 goto out;
562
563 scontrol = (scontrol & 0x0f0) | 0x304;
564
565 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
566 goto out;
567
568 sata_set_spd(link);
569 }
570
571 /* issue phy wake/reset */
572 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
573 goto out;
574
575 scontrol = (scontrol & 0x0f0) | 0x301;
576
577 if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
578 goto out;
579
580 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
581 * 10.4.2 says at least 1 ms.
582 */
583 ata_msleep(link->ap, 1);
584
585 /* bring link back */
586 rc = sata_link_resume(link, timing, deadline);
587 if (rc)
588 goto out;
589 /* if link is offline nothing more to do */
590 if (ata_phys_link_offline(link))
591 goto out;
592
593 /* Link is online. From this point, -ENODEV too is an error. */
594 if (online)
595 *online = true;
596
597 if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
598 /* If PMP is supported, we have to do follow-up SRST.
599 * Some PMPs don't send D2H Reg FIS after hardreset if
600 * the first port is empty. Wait only for
601 * ATA_TMOUT_PMP_SRST_WAIT.
602 */
603 if (check_ready) {
604 unsigned long pmp_deadline;
605
606 pmp_deadline = ata_deadline(jiffies,
607 ATA_TMOUT_PMP_SRST_WAIT);
608 if (time_after(pmp_deadline, deadline))
609 pmp_deadline = deadline;
610 ata_wait_ready(link, pmp_deadline, check_ready);
611 }
612 rc = -EAGAIN;
613 goto out;
614 }
615
616 rc = 0;
617 if (check_ready)
618 rc = ata_wait_ready(link, deadline, check_ready);
619 out:
620 if (rc && rc != -EAGAIN) {
621 /* online is set iff link is online && reset succeeded */
622 if (online)
623 *online = false;
624 }
625 return rc;
626}
627EXPORT_SYMBOL_GPL(sata_link_hardreset);
628
629/**
630 * ata_qc_complete_multiple - Complete multiple qcs successfully
631 * @ap: port in question
632 * @qc_active: new qc_active mask
633 *
634 * Complete in-flight commands. This functions is meant to be
635 * called from low-level driver's interrupt routine to complete
636 * requests normally. ap->qc_active and @qc_active is compared
637 * and commands are completed accordingly.
638 *
639 * Always use this function when completing multiple NCQ commands
640 * from IRQ handlers instead of calling ata_qc_complete()
641 * multiple times to keep IRQ expect status properly in sync.
642 *
643 * LOCKING:
644 * spin_lock_irqsave(host lock)
645 *
646 * RETURNS:
647 * Number of completed commands on success, -errno otherwise.
648 */
649int ata_qc_complete_multiple(struct ata_port *ap, u64 qc_active)
650{
651 u64 done_mask, ap_qc_active = ap->qc_active;
652 int nr_done = 0;
653
654 /*
655 * If the internal tag is set on ap->qc_active, then we care about
656 * bit0 on the passed in qc_active mask. Move that bit up to match
657 * the internal tag.
658 */
659 if (ap_qc_active & (1ULL << ATA_TAG_INTERNAL)) {
660 qc_active |= (qc_active & 0x01) << ATA_TAG_INTERNAL;
661 qc_active ^= qc_active & 0x01;
662 }
663
664 done_mask = ap_qc_active ^ qc_active;
665
666 if (unlikely(done_mask & qc_active)) {
667 ata_port_err(ap, "illegal qc_active transition (%08llx->%08llx)\n",
668 ap->qc_active, qc_active);
669 return -EINVAL;
670 }
671
672 if (ap->ops->qc_ncq_fill_rtf)
673 ap->ops->qc_ncq_fill_rtf(ap, done_mask);
674
675 while (done_mask) {
676 struct ata_queued_cmd *qc;
677 unsigned int tag = __ffs64(done_mask);
678
679 qc = ata_qc_from_tag(ap, tag);
680 if (qc) {
681 ata_qc_complete(qc);
682 nr_done++;
683 }
684 done_mask &= ~(1ULL << tag);
685 }
686
687 return nr_done;
688}
689EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
690
691/**
692 * ata_slave_link_init - initialize slave link
693 * @ap: port to initialize slave link for
694 *
695 * Create and initialize slave link for @ap. This enables slave
696 * link handling on the port.
697 *
698 * In libata, a port contains links and a link contains devices.
699 * There is single host link but if a PMP is attached to it,
700 * there can be multiple fan-out links. On SATA, there's usually
701 * a single device connected to a link but PATA and SATA
702 * controllers emulating TF based interface can have two - master
703 * and slave.
704 *
705 * However, there are a few controllers which don't fit into this
706 * abstraction too well - SATA controllers which emulate TF
707 * interface with both master and slave devices but also have
708 * separate SCR register sets for each device. These controllers
709 * need separate links for physical link handling
710 * (e.g. onlineness, link speed) but should be treated like a
711 * traditional M/S controller for everything else (e.g. command
712 * issue, softreset).
713 *
714 * slave_link is libata's way of handling this class of
715 * controllers without impacting core layer too much. For
716 * anything other than physical link handling, the default host
717 * link is used for both master and slave. For physical link
718 * handling, separate @ap->slave_link is used. All dirty details
719 * are implemented inside libata core layer. From LLD's POV, the
720 * only difference is that prereset, hardreset and postreset are
721 * called once more for the slave link, so the reset sequence
722 * looks like the following.
723 *
724 * prereset(M) -> prereset(S) -> hardreset(M) -> hardreset(S) ->
725 * softreset(M) -> postreset(M) -> postreset(S)
726 *
727 * Note that softreset is called only for the master. Softreset
728 * resets both M/S by definition, so SRST on master should handle
729 * both (the standard method will work just fine).
730 *
731 * LOCKING:
732 * Should be called before host is registered.
733 *
734 * RETURNS:
735 * 0 on success, -errno on failure.
736 */
737int ata_slave_link_init(struct ata_port *ap)
738{
739 struct ata_link *link;
740
741 WARN_ON(ap->slave_link);
742 WARN_ON(ap->flags & ATA_FLAG_PMP);
743
744 link = kzalloc(sizeof(*link), GFP_KERNEL);
745 if (!link)
746 return -ENOMEM;
747
748 ata_link_init(ap, link, 1);
749 ap->slave_link = link;
750 return 0;
751}
752EXPORT_SYMBOL_GPL(ata_slave_link_init);
753
754/**
755 * sata_lpm_ignore_phy_events - test if PHY event should be ignored
756 * @link: Link receiving the event
757 *
758 * Test whether the received PHY event has to be ignored or not.
759 *
760 * LOCKING:
761 * None:
762 *
763 * RETURNS:
764 * True if the event has to be ignored.
765 */
766bool sata_lpm_ignore_phy_events(struct ata_link *link)
767{
768 unsigned long lpm_timeout = link->last_lpm_change +
769 msecs_to_jiffies(ATA_TMOUT_SPURIOUS_PHY);
770
771 /* if LPM is enabled, PHYRDY doesn't mean anything */
772 if (link->lpm_policy > ATA_LPM_MAX_POWER)
773 return true;
774
775 /* ignore the first PHY event after the LPM policy changed
776 * as it is might be spurious
777 */
778 if ((link->flags & ATA_LFLAG_CHANGED) &&
779 time_before(jiffies, lpm_timeout))
780 return true;
781
782 return false;
783}
784EXPORT_SYMBOL_GPL(sata_lpm_ignore_phy_events);
785
786static const char *ata_lpm_policy_names[] = {
787 [ATA_LPM_UNKNOWN] = "keep_firmware_settings",
788 [ATA_LPM_MAX_POWER] = "max_performance",
789 [ATA_LPM_MED_POWER] = "medium_power",
790 [ATA_LPM_MED_POWER_WITH_DIPM] = "med_power_with_dipm",
791 [ATA_LPM_MIN_POWER_WITH_PARTIAL] = "min_power_with_partial",
792 [ATA_LPM_MIN_POWER] = "min_power",
793};
794
795static ssize_t ata_scsi_lpm_store(struct device *device,
796 struct device_attribute *attr,
797 const char *buf, size_t count)
798{
799 struct Scsi_Host *shost = class_to_shost(device);
800 struct ata_port *ap = ata_shost_to_port(shost);
801 struct ata_link *link;
802 struct ata_device *dev;
803 enum ata_lpm_policy policy;
804 unsigned long flags;
805
806 /* UNKNOWN is internal state, iterate from MAX_POWER */
807 for (policy = ATA_LPM_MAX_POWER;
808 policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) {
809 const char *name = ata_lpm_policy_names[policy];
810
811 if (strncmp(name, buf, strlen(name)) == 0)
812 break;
813 }
814 if (policy == ARRAY_SIZE(ata_lpm_policy_names))
815 return -EINVAL;
816
817 spin_lock_irqsave(ap->lock, flags);
818
819 ata_for_each_link(link, ap, EDGE) {
820 ata_for_each_dev(dev, &ap->link, ENABLED) {
821 if (dev->horkage & ATA_HORKAGE_NOLPM) {
822 count = -EOPNOTSUPP;
823 goto out_unlock;
824 }
825 }
826 }
827
828 ap->target_lpm_policy = policy;
829 ata_port_schedule_eh(ap);
830out_unlock:
831 spin_unlock_irqrestore(ap->lock, flags);
832 return count;
833}
834
835static ssize_t ata_scsi_lpm_show(struct device *dev,
836 struct device_attribute *attr, char *buf)
837{
838 struct Scsi_Host *shost = class_to_shost(dev);
839 struct ata_port *ap = ata_shost_to_port(shost);
840
841 if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names))
842 return -EINVAL;
843
844 return sysfs_emit(buf, "%s\n",
845 ata_lpm_policy_names[ap->target_lpm_policy]);
846}
847DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
848 ata_scsi_lpm_show, ata_scsi_lpm_store);
849EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy);
850
851static ssize_t ata_ncq_prio_supported_show(struct device *device,
852 struct device_attribute *attr,
853 char *buf)
854{
855 struct scsi_device *sdev = to_scsi_device(device);
856 struct ata_port *ap = ata_shost_to_port(sdev->host);
857 struct ata_device *dev;
858 bool ncq_prio_supported;
859 int rc = 0;
860
861 spin_lock_irq(ap->lock);
862 dev = ata_scsi_find_dev(ap, sdev);
863 if (!dev)
864 rc = -ENODEV;
865 else
866 ncq_prio_supported = dev->flags & ATA_DFLAG_NCQ_PRIO;
867 spin_unlock_irq(ap->lock);
868
869 return rc ? rc : sysfs_emit(buf, "%u\n", ncq_prio_supported);
870}
871
872DEVICE_ATTR(ncq_prio_supported, S_IRUGO, ata_ncq_prio_supported_show, NULL);
873EXPORT_SYMBOL_GPL(dev_attr_ncq_prio_supported);
874
875static ssize_t ata_ncq_prio_enable_show(struct device *device,
876 struct device_attribute *attr,
877 char *buf)
878{
879 struct scsi_device *sdev = to_scsi_device(device);
880 struct ata_port *ap = ata_shost_to_port(sdev->host);
881 struct ata_device *dev;
882 bool ncq_prio_enable;
883 int rc = 0;
884
885 spin_lock_irq(ap->lock);
886 dev = ata_scsi_find_dev(ap, sdev);
887 if (!dev)
888 rc = -ENODEV;
889 else
890 ncq_prio_enable = dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLED;
891 spin_unlock_irq(ap->lock);
892
893 return rc ? rc : sysfs_emit(buf, "%u\n", ncq_prio_enable);
894}
895
896static ssize_t ata_ncq_prio_enable_store(struct device *device,
897 struct device_attribute *attr,
898 const char *buf, size_t len)
899{
900 struct scsi_device *sdev = to_scsi_device(device);
901 struct ata_port *ap;
902 struct ata_device *dev;
903 long int input;
904 int rc = 0;
905
906 rc = kstrtol(buf, 10, &input);
907 if (rc)
908 return rc;
909 if ((input < 0) || (input > 1))
910 return -EINVAL;
911
912 ap = ata_shost_to_port(sdev->host);
913 dev = ata_scsi_find_dev(ap, sdev);
914 if (unlikely(!dev))
915 return -ENODEV;
916
917 spin_lock_irq(ap->lock);
918
919 if (!(dev->flags & ATA_DFLAG_NCQ_PRIO)) {
920 rc = -EINVAL;
921 goto unlock;
922 }
923
924 if (input) {
925 if (dev->flags & ATA_DFLAG_CDL_ENABLED) {
926 ata_dev_err(dev,
927 "CDL must be disabled to enable NCQ priority\n");
928 rc = -EINVAL;
929 goto unlock;
930 }
931 dev->flags |= ATA_DFLAG_NCQ_PRIO_ENABLED;
932 } else {
933 dev->flags &= ~ATA_DFLAG_NCQ_PRIO_ENABLED;
934 }
935
936unlock:
937 spin_unlock_irq(ap->lock);
938
939 return rc ? rc : len;
940}
941
942DEVICE_ATTR(ncq_prio_enable, S_IRUGO | S_IWUSR,
943 ata_ncq_prio_enable_show, ata_ncq_prio_enable_store);
944EXPORT_SYMBOL_GPL(dev_attr_ncq_prio_enable);
945
946static struct attribute *ata_ncq_sdev_attrs[] = {
947 &dev_attr_unload_heads.attr,
948 &dev_attr_ncq_prio_enable.attr,
949 &dev_attr_ncq_prio_supported.attr,
950 NULL
951};
952
953static const struct attribute_group ata_ncq_sdev_attr_group = {
954 .attrs = ata_ncq_sdev_attrs
955};
956
957const struct attribute_group *ata_ncq_sdev_groups[] = {
958 &ata_ncq_sdev_attr_group,
959 NULL
960};
961EXPORT_SYMBOL_GPL(ata_ncq_sdev_groups);
962
963static ssize_t
964ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr,
965 const char *buf, size_t count)
966{
967 struct Scsi_Host *shost = class_to_shost(dev);
968 struct ata_port *ap = ata_shost_to_port(shost);
969 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM))
970 return ap->ops->em_store(ap, buf, count);
971 return -EINVAL;
972}
973
974static ssize_t
975ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr,
976 char *buf)
977{
978 struct Scsi_Host *shost = class_to_shost(dev);
979 struct ata_port *ap = ata_shost_to_port(shost);
980
981 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM))
982 return ap->ops->em_show(ap, buf);
983 return -EINVAL;
984}
985DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR,
986 ata_scsi_em_message_show, ata_scsi_em_message_store);
987EXPORT_SYMBOL_GPL(dev_attr_em_message);
988
989static ssize_t
990ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr,
991 char *buf)
992{
993 struct Scsi_Host *shost = class_to_shost(dev);
994 struct ata_port *ap = ata_shost_to_port(shost);
995
996 return sysfs_emit(buf, "%d\n", ap->em_message_type);
997}
998DEVICE_ATTR(em_message_type, S_IRUGO,
999 ata_scsi_em_message_type_show, NULL);
1000EXPORT_SYMBOL_GPL(dev_attr_em_message_type);
1001
1002static ssize_t
1003ata_scsi_activity_show(struct device *dev, struct device_attribute *attr,
1004 char *buf)
1005{
1006 struct scsi_device *sdev = to_scsi_device(dev);
1007 struct ata_port *ap = ata_shost_to_port(sdev->host);
1008 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
1009
1010 if (atadev && ap->ops->sw_activity_show &&
1011 (ap->flags & ATA_FLAG_SW_ACTIVITY))
1012 return ap->ops->sw_activity_show(atadev, buf);
1013 return -EINVAL;
1014}
1015
1016static ssize_t
1017ata_scsi_activity_store(struct device *dev, struct device_attribute *attr,
1018 const char *buf, size_t count)
1019{
1020 struct scsi_device *sdev = to_scsi_device(dev);
1021 struct ata_port *ap = ata_shost_to_port(sdev->host);
1022 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
1023 enum sw_activity val;
1024 int rc;
1025
1026 if (atadev && ap->ops->sw_activity_store &&
1027 (ap->flags & ATA_FLAG_SW_ACTIVITY)) {
1028 val = simple_strtoul(buf, NULL, 0);
1029 switch (val) {
1030 case OFF: case BLINK_ON: case BLINK_OFF:
1031 rc = ap->ops->sw_activity_store(atadev, val);
1032 if (!rc)
1033 return count;
1034 else
1035 return rc;
1036 }
1037 }
1038 return -EINVAL;
1039}
1040DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show,
1041 ata_scsi_activity_store);
1042EXPORT_SYMBOL_GPL(dev_attr_sw_activity);
1043
1044/**
1045 * ata_change_queue_depth - Set a device maximum queue depth
1046 * @ap: ATA port of the target device
1047 * @sdev: SCSI device to configure queue depth for
1048 * @queue_depth: new queue depth
1049 *
1050 * Helper to set a device maximum queue depth, usable with both libsas
1051 * and libata.
1052 *
1053 */
1054int ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev,
1055 int queue_depth)
1056{
1057 struct ata_device *dev;
1058 unsigned long flags;
1059 int max_queue_depth;
1060
1061 spin_lock_irqsave(ap->lock, flags);
1062
1063 dev = ata_scsi_find_dev(ap, sdev);
1064 if (!dev || queue_depth < 1 || queue_depth == sdev->queue_depth) {
1065 spin_unlock_irqrestore(ap->lock, flags);
1066 return sdev->queue_depth;
1067 }
1068
1069 /*
1070 * Make sure that the queue depth requested does not exceed the device
1071 * capabilities.
1072 */
1073 max_queue_depth = min(ATA_MAX_QUEUE, sdev->host->can_queue);
1074 max_queue_depth = min(max_queue_depth, ata_id_queue_depth(dev->id));
1075 if (queue_depth > max_queue_depth) {
1076 spin_unlock_irqrestore(ap->lock, flags);
1077 return -EINVAL;
1078 }
1079
1080 /*
1081 * If NCQ is not supported by the device or if the target queue depth
1082 * is 1 (to disable drive side command queueing), turn off NCQ.
1083 */
1084 if (queue_depth == 1 || !ata_ncq_supported(dev)) {
1085 dev->flags |= ATA_DFLAG_NCQ_OFF;
1086 queue_depth = 1;
1087 } else {
1088 dev->flags &= ~ATA_DFLAG_NCQ_OFF;
1089 }
1090
1091 spin_unlock_irqrestore(ap->lock, flags);
1092
1093 if (queue_depth == sdev->queue_depth)
1094 return sdev->queue_depth;
1095
1096 return scsi_change_queue_depth(sdev, queue_depth);
1097}
1098EXPORT_SYMBOL_GPL(ata_change_queue_depth);
1099
1100/**
1101 * ata_scsi_change_queue_depth - SCSI callback for queue depth config
1102 * @sdev: SCSI device to configure queue depth for
1103 * @queue_depth: new queue depth
1104 *
1105 * This is libata standard hostt->change_queue_depth callback.
1106 * SCSI will call into this callback when user tries to set queue
1107 * depth via sysfs.
1108 *
1109 * LOCKING:
1110 * SCSI layer (we don't care)
1111 *
1112 * RETURNS:
1113 * Newly configured queue depth.
1114 */
1115int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
1116{
1117 struct ata_port *ap = ata_shost_to_port(sdev->host);
1118
1119 return ata_change_queue_depth(ap, sdev, queue_depth);
1120}
1121EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
1122
1123/**
1124 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device
1125 * @host: ATA host container for all SAS ports
1126 * @port_info: Information from low-level host driver
1127 * @shost: SCSI host that the scsi device is attached to
1128 *
1129 * LOCKING:
1130 * PCI/etc. bus probe sem.
1131 *
1132 * RETURNS:
1133 * ata_port pointer on success / NULL on failure.
1134 */
1135
1136struct ata_port *ata_sas_port_alloc(struct ata_host *host,
1137 struct ata_port_info *port_info,
1138 struct Scsi_Host *shost)
1139{
1140 struct ata_port *ap;
1141
1142 ap = ata_port_alloc(host);
1143 if (!ap)
1144 return NULL;
1145
1146 ap->port_no = 0;
1147 ap->lock = &host->lock;
1148 ap->pio_mask = port_info->pio_mask;
1149 ap->mwdma_mask = port_info->mwdma_mask;
1150 ap->udma_mask = port_info->udma_mask;
1151 ap->flags |= port_info->flags;
1152 ap->ops = port_info->port_ops;
1153 ap->cbl = ATA_CBL_SATA;
1154 ap->print_id = atomic_inc_return(&ata_print_id);
1155
1156 return ap;
1157}
1158EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
1159
1160int ata_sas_tport_add(struct device *parent, struct ata_port *ap)
1161{
1162 return ata_tport_add(parent, ap);
1163}
1164EXPORT_SYMBOL_GPL(ata_sas_tport_add);
1165
1166void ata_sas_tport_delete(struct ata_port *ap)
1167{
1168 ata_tport_delete(ap);
1169}
1170EXPORT_SYMBOL_GPL(ata_sas_tport_delete);
1171
1172/**
1173 * ata_sas_slave_configure - Default slave_config routine for libata devices
1174 * @sdev: SCSI device to configure
1175 * @ap: ATA port to which SCSI device is attached
1176 *
1177 * RETURNS:
1178 * Zero.
1179 */
1180
1181int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
1182{
1183 ata_scsi_sdev_config(sdev);
1184
1185 return ata_scsi_dev_config(sdev, ap->link.device);
1186}
1187EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
1188
1189/**
1190 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
1191 * @cmd: SCSI command to be sent
1192 * @ap: ATA port to which the command is being sent
1193 *
1194 * RETURNS:
1195 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
1196 * 0 otherwise.
1197 */
1198
1199int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap)
1200{
1201 int rc = 0;
1202
1203 if (likely(ata_dev_enabled(ap->link.device)))
1204 rc = __ata_scsi_queuecmd(cmd, ap->link.device);
1205 else {
1206 cmd->result = (DID_BAD_TARGET << 16);
1207 scsi_done(cmd);
1208 }
1209 return rc;
1210}
1211EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
1212
1213/**
1214 * sata_async_notification - SATA async notification handler
1215 * @ap: ATA port where async notification is received
1216 *
1217 * Handler to be called when async notification via SDB FIS is
1218 * received. This function schedules EH if necessary.
1219 *
1220 * LOCKING:
1221 * spin_lock_irqsave(host lock)
1222 *
1223 * RETURNS:
1224 * 1 if EH is scheduled, 0 otherwise.
1225 */
1226int sata_async_notification(struct ata_port *ap)
1227{
1228 u32 sntf;
1229 int rc;
1230
1231 if (!(ap->flags & ATA_FLAG_AN))
1232 return 0;
1233
1234 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
1235 if (rc == 0)
1236 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
1237
1238 if (!sata_pmp_attached(ap) || rc) {
1239 /* PMP is not attached or SNTF is not available */
1240 if (!sata_pmp_attached(ap)) {
1241 /* PMP is not attached. Check whether ATAPI
1242 * AN is configured. If so, notify media
1243 * change.
1244 */
1245 struct ata_device *dev = ap->link.device;
1246
1247 if ((dev->class == ATA_DEV_ATAPI) &&
1248 (dev->flags & ATA_DFLAG_AN))
1249 ata_scsi_media_change_notify(dev);
1250 return 0;
1251 } else {
1252 /* PMP is attached but SNTF is not available.
1253 * ATAPI async media change notification is
1254 * not used. The PMP must be reporting PHY
1255 * status change, schedule EH.
1256 */
1257 ata_port_schedule_eh(ap);
1258 return 1;
1259 }
1260 } else {
1261 /* PMP is attached and SNTF is available */
1262 struct ata_link *link;
1263
1264 /* check and notify ATAPI AN */
1265 ata_for_each_link(link, ap, EDGE) {
1266 if (!(sntf & (1 << link->pmp)))
1267 continue;
1268
1269 if ((link->device->class == ATA_DEV_ATAPI) &&
1270 (link->device->flags & ATA_DFLAG_AN))
1271 ata_scsi_media_change_notify(link->device);
1272 }
1273
1274 /* If PMP is reporting that PHY status of some
1275 * downstream ports has changed, schedule EH.
1276 */
1277 if (sntf & (1 << SATA_PMP_CTRL_PORT)) {
1278 ata_port_schedule_eh(ap);
1279 return 1;
1280 }
1281
1282 return 0;
1283 }
1284}
1285EXPORT_SYMBOL_GPL(sata_async_notification);
1286
1287/**
1288 * ata_eh_read_log_10h - Read log page 10h for NCQ error details
1289 * @dev: Device to read log page 10h from
1290 * @tag: Resulting tag of the failed command
1291 * @tf: Resulting taskfile registers of the failed command
1292 *
1293 * Read log page 10h to obtain NCQ error details and clear error
1294 * condition.
1295 *
1296 * LOCKING:
1297 * Kernel thread context (may sleep).
1298 *
1299 * RETURNS:
1300 * 0 on success, -errno otherwise.
1301 */
1302static int ata_eh_read_log_10h(struct ata_device *dev,
1303 int *tag, struct ata_taskfile *tf)
1304{
1305 u8 *buf = dev->link->ap->sector_buf;
1306 unsigned int err_mask;
1307 u8 csum;
1308 int i;
1309
1310 err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, 0, buf, 1);
1311 if (err_mask)
1312 return -EIO;
1313
1314 csum = 0;
1315 for (i = 0; i < ATA_SECT_SIZE; i++)
1316 csum += buf[i];
1317 if (csum)
1318 ata_dev_warn(dev, "invalid checksum 0x%x on log page 10h\n",
1319 csum);
1320
1321 if (buf[0] & 0x80)
1322 return -ENOENT;
1323
1324 *tag = buf[0] & 0x1f;
1325
1326 tf->status = buf[2];
1327 tf->error = buf[3];
1328 tf->lbal = buf[4];
1329 tf->lbam = buf[5];
1330 tf->lbah = buf[6];
1331 tf->device = buf[7];
1332 tf->hob_lbal = buf[8];
1333 tf->hob_lbam = buf[9];
1334 tf->hob_lbah = buf[10];
1335 tf->nsect = buf[12];
1336 tf->hob_nsect = buf[13];
1337 if (ata_id_has_ncq_autosense(dev->id) && (tf->status & ATA_SENSE))
1338 tf->auxiliary = buf[14] << 16 | buf[15] << 8 | buf[16];
1339
1340 return 0;
1341}
1342
1343/**
1344 * ata_eh_read_sense_success_ncq_log - Read the sense data for successful
1345 * NCQ commands log
1346 * @link: ATA link to get sense data for
1347 *
1348 * Read the sense data for successful NCQ commands log page to obtain
1349 * sense data for all NCQ commands that completed successfully with
1350 * the sense data available bit set.
1351 *
1352 * LOCKING:
1353 * Kernel thread context (may sleep).
1354 *
1355 * RETURNS:
1356 * 0 on success, -errno otherwise.
1357 */
1358int ata_eh_read_sense_success_ncq_log(struct ata_link *link)
1359{
1360 struct ata_device *dev = link->device;
1361 struct ata_port *ap = dev->link->ap;
1362 u8 *buf = ap->ncq_sense_buf;
1363 struct ata_queued_cmd *qc;
1364 unsigned int err_mask, tag;
1365 u8 *sense, sk = 0, asc = 0, ascq = 0;
1366 u64 sense_valid, val;
1367 int ret = 0;
1368
1369 err_mask = ata_read_log_page(dev, ATA_LOG_SENSE_NCQ, 0, buf, 2);
1370 if (err_mask) {
1371 ata_dev_err(dev,
1372 "Failed to read Sense Data for Successful NCQ Commands log\n");
1373 return -EIO;
1374 }
1375
1376 /* Check the log header */
1377 val = get_unaligned_le64(&buf[0]);
1378 if ((val & 0xffff) != 1 || ((val >> 16) & 0xff) != 0x0f) {
1379 ata_dev_err(dev,
1380 "Invalid Sense Data for Successful NCQ Commands log\n");
1381 return -EIO;
1382 }
1383
1384 sense_valid = (u64)buf[8] | ((u64)buf[9] << 8) |
1385 ((u64)buf[10] << 16) | ((u64)buf[11] << 24);
1386
1387 ata_qc_for_each_raw(ap, qc, tag) {
1388 if (!(qc->flags & ATA_QCFLAG_EH) ||
1389 !(qc->flags & ATA_QCFLAG_EH_SUCCESS_CMD) ||
1390 qc->err_mask ||
1391 ata_dev_phys_link(qc->dev) != link)
1392 continue;
1393
1394 /*
1395 * If the command does not have any sense data, clear ATA_SENSE.
1396 * Keep ATA_QCFLAG_EH_SUCCESS_CMD so that command is finished.
1397 */
1398 if (!(sense_valid & (1ULL << tag))) {
1399 qc->result_tf.status &= ~ATA_SENSE;
1400 continue;
1401 }
1402
1403 sense = &buf[32 + 24 * tag];
1404 sk = sense[0];
1405 asc = sense[1];
1406 ascq = sense[2];
1407
1408 if (!ata_scsi_sense_is_valid(sk, asc, ascq)) {
1409 ret = -EIO;
1410 continue;
1411 }
1412
1413 /* Set sense without also setting scsicmd->result */
1414 scsi_build_sense_buffer(dev->flags & ATA_DFLAG_D_SENSE,
1415 qc->scsicmd->sense_buffer, sk,
1416 asc, ascq);
1417 qc->flags |= ATA_QCFLAG_SENSE_VALID;
1418
1419 /*
1420 * If we have sense data, call scsi_check_sense() in order to
1421 * set the correct SCSI ML byte (if any). No point in checking
1422 * the return value, since the command has already completed
1423 * successfully.
1424 */
1425 scsi_check_sense(qc->scsicmd);
1426 }
1427
1428 return ret;
1429}
1430EXPORT_SYMBOL_GPL(ata_eh_read_sense_success_ncq_log);
1431
1432/**
1433 * ata_eh_analyze_ncq_error - analyze NCQ error
1434 * @link: ATA link to analyze NCQ error for
1435 *
1436 * Read log page 10h, determine the offending qc and acquire
1437 * error status TF. For NCQ device errors, all LLDDs have to do
1438 * is setting AC_ERR_DEV in ehi->err_mask. This function takes
1439 * care of the rest.
1440 *
1441 * LOCKING:
1442 * Kernel thread context (may sleep).
1443 */
1444void ata_eh_analyze_ncq_error(struct ata_link *link)
1445{
1446 struct ata_port *ap = link->ap;
1447 struct ata_eh_context *ehc = &link->eh_context;
1448 struct ata_device *dev = link->device;
1449 struct ata_queued_cmd *qc;
1450 struct ata_taskfile tf;
1451 int tag, rc;
1452
1453 /* if frozen, we can't do much */
1454 if (ata_port_is_frozen(ap))
1455 return;
1456
1457 /* is it NCQ device error? */
1458 if (!link->sactive || !(ehc->i.err_mask & AC_ERR_DEV))
1459 return;
1460
1461 /* has LLDD analyzed already? */
1462 ata_qc_for_each_raw(ap, qc, tag) {
1463 if (!(qc->flags & ATA_QCFLAG_EH))
1464 continue;
1465
1466 if (qc->err_mask)
1467 return;
1468 }
1469
1470 /* okay, this error is ours */
1471 memset(&tf, 0, sizeof(tf));
1472 rc = ata_eh_read_log_10h(dev, &tag, &tf);
1473 if (rc) {
1474 ata_link_err(link, "failed to read log page 10h (errno=%d)\n",
1475 rc);
1476 return;
1477 }
1478
1479 if (!(link->sactive & (1 << tag))) {
1480 ata_link_err(link, "log page 10h reported inactive tag %d\n",
1481 tag);
1482 return;
1483 }
1484
1485 /* we've got the perpetrator, condemn it */
1486 qc = __ata_qc_from_tag(ap, tag);
1487 memcpy(&qc->result_tf, &tf, sizeof(tf));
1488 qc->result_tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
1489 qc->err_mask |= AC_ERR_DEV | AC_ERR_NCQ;
1490
1491 /*
1492 * If the device supports NCQ autosense, ata_eh_read_log_10h() will have
1493 * stored the sense data in qc->result_tf.auxiliary.
1494 */
1495 if (qc->result_tf.auxiliary) {
1496 char sense_key, asc, ascq;
1497
1498 sense_key = (qc->result_tf.auxiliary >> 16) & 0xff;
1499 asc = (qc->result_tf.auxiliary >> 8) & 0xff;
1500 ascq = qc->result_tf.auxiliary & 0xff;
1501 if (ata_scsi_sense_is_valid(sense_key, asc, ascq)) {
1502 ata_scsi_set_sense(dev, qc->scsicmd, sense_key, asc,
1503 ascq);
1504 ata_scsi_set_sense_information(dev, qc->scsicmd,
1505 &qc->result_tf);
1506 qc->flags |= ATA_QCFLAG_SENSE_VALID;
1507 }
1508 }
1509
1510 ata_qc_for_each_raw(ap, qc, tag) {
1511 if (!(qc->flags & ATA_QCFLAG_EH) ||
1512 qc->flags & ATA_QCFLAG_EH_SUCCESS_CMD ||
1513 ata_dev_phys_link(qc->dev) != link)
1514 continue;
1515
1516 /* Skip the single QC which caused the NCQ error. */
1517 if (qc->err_mask)
1518 continue;
1519
1520 /*
1521 * For SATA, the STATUS and ERROR fields are shared for all NCQ
1522 * commands that were completed with the same SDB FIS.
1523 * Therefore, we have to clear the ATA_ERR bit for all QCs
1524 * except the one that caused the NCQ error.
1525 */
1526 qc->result_tf.status &= ~ATA_ERR;
1527 qc->result_tf.error = 0;
1528
1529 /*
1530 * If we get a NCQ error, that means that a single command was
1531 * aborted. All other failed commands for our link should be
1532 * retried and has no business of going though further scrutiny
1533 * by ata_eh_link_autopsy().
1534 */
1535 qc->flags |= ATA_QCFLAG_RETRY;
1536 }
1537
1538 ehc->i.err_mask &= ~AC_ERR_DEV;
1539}
1540EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error);