2 * libata-pmp.c - libata port multiplier support
4 * Copyright (c) 2007 SUSE Linux Products GmbH
5 * Copyright (c) 2007 Tejun Heo <teheo@suse.de>
7 * This file is released under the GPLv2.
10 #include <linux/kernel.h>
11 #include <linux/libata.h>
15 * sata_pmp_read - read PMP register
16 * @link: link to read PMP register for
17 * @reg: register to read
18 * @r_val: resulting value
23 * Kernel thread context (may sleep).
26 * 0 on success, AC_ERR_* mask on failure.
28 static unsigned int sata_pmp_read(struct ata_link
*link
, int reg
, u32
*r_val
)
30 struct ata_port
*ap
= link
->ap
;
31 struct ata_device
*pmp_dev
= ap
->link
.device
;
32 struct ata_taskfile tf
;
33 unsigned int err_mask
;
35 ata_tf_init(pmp_dev
, &tf
);
36 tf
.command
= ATA_CMD_PMP_READ
;
37 tf
.protocol
= ATA_PROT_NODATA
;
38 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
| ATA_TFLAG_LBA48
;
40 tf
.device
= link
->pmp
;
42 err_mask
= ata_exec_internal(pmp_dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0,
43 SATA_PMP_SCR_TIMEOUT
);
47 *r_val
= tf
.nsect
| tf
.lbal
<< 8 | tf
.lbam
<< 16 | tf
.lbah
<< 24;
52 * sata_pmp_write - write PMP register
53 * @link: link to write PMP register for
54 * @reg: register to write
55 * @r_val: value to write
60 * Kernel thread context (may sleep).
63 * 0 on success, AC_ERR_* mask on failure.
65 static unsigned int sata_pmp_write(struct ata_link
*link
, int reg
, u32 val
)
67 struct ata_port
*ap
= link
->ap
;
68 struct ata_device
*pmp_dev
= ap
->link
.device
;
69 struct ata_taskfile tf
;
71 ata_tf_init(pmp_dev
, &tf
);
72 tf
.command
= ATA_CMD_PMP_WRITE
;
73 tf
.protocol
= ATA_PROT_NODATA
;
74 tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
| ATA_TFLAG_LBA48
;
76 tf
.device
= link
->pmp
;
77 tf
.nsect
= val
& 0xff;
78 tf
.lbal
= (val
>> 8) & 0xff;
79 tf
.lbam
= (val
>> 16) & 0xff;
80 tf
.lbah
= (val
>> 24) & 0xff;
82 return ata_exec_internal(pmp_dev
, &tf
, NULL
, DMA_NONE
, NULL
, 0,
83 SATA_PMP_SCR_TIMEOUT
);
87 * sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP
88 * @qc: ATA command in question
90 * A host which has command switching PMP support cannot issue
91 * commands to multiple links simultaneously.
94 * spin_lock_irqsave(host lock)
97 * ATA_DEFER_* if deferring is needed, 0 otherwise.
99 int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd
*qc
)
101 struct ata_link
*link
= qc
->dev
->link
;
102 struct ata_port
*ap
= link
->ap
;
104 if (ap
->excl_link
== NULL
|| ap
->excl_link
== link
) {
105 if (ap
->nr_active_links
== 0 || ata_link_active(link
)) {
106 qc
->flags
|= ATA_QCFLAG_CLEAR_EXCL
;
107 return ata_std_qc_defer(qc
);
110 ap
->excl_link
= link
;
113 return ATA_DEFER_PORT
;
117 * sata_pmp_scr_read - read PSCR
118 * @link: ATA link to read PSCR for
120 * @r_val: resulting value
122 * Read PSCR @reg into @r_val for @link, to be called from
126 * Kernel thread context (may sleep).
129 * 0 on success, -errno on failure.
131 int sata_pmp_scr_read(struct ata_link
*link
, int reg
, u32
*r_val
)
133 unsigned int err_mask
;
135 if (reg
> SATA_PMP_PSCR_CONTROL
)
138 err_mask
= sata_pmp_read(link
, reg
, r_val
);
140 ata_link_printk(link
, KERN_WARNING
, "failed to read SCR %d "
141 "(Emask=0x%x)\n", reg
, err_mask
);
148 * sata_pmp_scr_write - write PSCR
149 * @link: ATA link to write PSCR for
150 * @reg: PSCR to write
151 * @val: value to be written
153 * Write @val to PSCR @reg for @link, to be called from
154 * ata_scr_write() and ata_scr_write_flush().
157 * Kernel thread context (may sleep).
160 * 0 on success, -errno on failure.
162 int sata_pmp_scr_write(struct ata_link
*link
, int reg
, u32 val
)
164 unsigned int err_mask
;
166 if (reg
> SATA_PMP_PSCR_CONTROL
)
169 err_mask
= sata_pmp_write(link
, reg
, val
);
171 ata_link_printk(link
, KERN_WARNING
, "failed to write SCR %d "
172 "(Emask=0x%x)\n", reg
, err_mask
);
179 * sata_pmp_read_gscr - read GSCR block of SATA PMP
181 * @gscr: buffer to read GSCR block into
183 * Read selected PMP GSCRs from the PMP at @dev. This will serve
184 * as configuration and identification info for the PMP.
187 * Kernel thread context (may sleep).
190 * 0 on success, -errno on failure.
192 static int sata_pmp_read_gscr(struct ata_device
*dev
, u32
*gscr
)
194 static const int gscr_to_read
[] = { 0, 1, 2, 32, 33, 64, 96 };
197 for (i
= 0; i
< ARRAY_SIZE(gscr_to_read
); i
++) {
198 int reg
= gscr_to_read
[i
];
199 unsigned int err_mask
;
201 err_mask
= sata_pmp_read(dev
->link
, reg
, &gscr
[reg
]);
203 ata_dev_printk(dev
, KERN_ERR
, "failed to read PMP "
204 "GSCR[%d] (Emask=0x%x)\n", reg
, err_mask
);
212 static const char *sata_pmp_spec_rev_str(const u32
*gscr
)
214 u32 rev
= gscr
[SATA_PMP_GSCR_REV
];
223 static int sata_pmp_configure(struct ata_device
*dev
, int print_info
)
225 struct ata_port
*ap
= dev
->link
->ap
;
226 u32
*gscr
= dev
->gscr
;
227 unsigned int err_mask
= 0;
231 nr_ports
= sata_pmp_gscr_ports(gscr
);
233 if (nr_ports
<= 0 || nr_ports
> SATA_PMP_MAX_PORTS
) {
235 reason
= "invalid nr_ports";
239 if ((ap
->flags
& ATA_FLAG_AN
) &&
240 (gscr
[SATA_PMP_GSCR_FEAT
] & SATA_PMP_FEAT_NOTIFY
))
241 dev
->flags
|= ATA_DFLAG_AN
;
243 /* monitor SERR_PHYRDY_CHG on fan-out ports */
244 err_mask
= sata_pmp_write(dev
->link
, SATA_PMP_GSCR_ERROR_EN
,
248 reason
= "failed to write GSCR_ERROR_EN";
252 /* turn off notification till fan-out ports are reset and configured */
253 if (gscr
[SATA_PMP_GSCR_FEAT_EN
] & SATA_PMP_FEAT_NOTIFY
) {
254 gscr
[SATA_PMP_GSCR_FEAT_EN
] &= ~SATA_PMP_FEAT_NOTIFY
;
256 err_mask
= sata_pmp_write(dev
->link
, SATA_PMP_GSCR_FEAT_EN
,
257 gscr
[SATA_PMP_GSCR_FEAT_EN
]);
260 reason
= "failed to write GSCR_FEAT_EN";
266 ata_dev_printk(dev
, KERN_INFO
, "Port Multiplier %s, "
267 "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n",
268 sata_pmp_spec_rev_str(gscr
),
269 sata_pmp_gscr_vendor(gscr
),
270 sata_pmp_gscr_devid(gscr
),
271 sata_pmp_gscr_rev(gscr
),
272 nr_ports
, gscr
[SATA_PMP_GSCR_FEAT_EN
],
273 gscr
[SATA_PMP_GSCR_FEAT
]);
275 if (!(dev
->flags
& ATA_DFLAG_AN
))
276 ata_dev_printk(dev
, KERN_INFO
,
277 "Asynchronous notification not supported, "
278 "hotplug won't\n work on fan-out "
279 "ports. Use warm-plug instead.\n");
285 ata_dev_printk(dev
, KERN_ERR
,
286 "failed to configure Port Multiplier (%s, Emask=0x%x)\n",
291 static int sata_pmp_init_links(struct ata_port
*ap
, int nr_ports
)
293 struct ata_link
*pmp_link
= ap
->pmp_link
;
297 pmp_link
= kzalloc(sizeof(pmp_link
[0]) * SATA_PMP_MAX_PORTS
,
302 for (i
= 0; i
< SATA_PMP_MAX_PORTS
; i
++)
303 ata_link_init(ap
, &pmp_link
[i
], i
);
305 ap
->pmp_link
= pmp_link
;
308 for (i
= 0; i
< nr_ports
; i
++) {
309 struct ata_link
*link
= &pmp_link
[i
];
310 struct ata_eh_context
*ehc
= &link
->eh_context
;
313 ehc
->i
.probe_mask
|= ATA_ALL_DEVICES
;
314 ehc
->i
.action
|= ATA_EH_RESET
;
320 static void sata_pmp_quirks(struct ata_port
*ap
)
322 u32
*gscr
= ap
->link
.device
->gscr
;
323 u16 vendor
= sata_pmp_gscr_vendor(gscr
);
324 u16 devid
= sata_pmp_gscr_devid(gscr
);
325 struct ata_link
*link
;
327 if (vendor
== 0x1095 && devid
== 0x3726) {
329 ata_port_for_each_link(link
, ap
) {
330 /* class code report is unreliable */
332 link
->flags
|= ATA_LFLAG_ASSUME_ATA
;
334 /* port 5 is for SEMB device and it doesn't like SRST */
336 link
->flags
|= ATA_LFLAG_NO_SRST
|
337 ATA_LFLAG_ASSUME_SEMB
;
339 } else if (vendor
== 0x1095 && devid
== 0x4723) {
341 ata_port_for_each_link(link
, ap
) {
342 /* class code report is unreliable */
344 link
->flags
|= ATA_LFLAG_ASSUME_ATA
;
346 /* the config device at port 2 locks up on SRST */
348 link
->flags
|= ATA_LFLAG_NO_SRST
|
349 ATA_LFLAG_ASSUME_ATA
;
351 } else if (vendor
== 0x1095 && devid
== 0x4726) {
353 ata_port_for_each_link(link
, ap
) {
354 /* Class code report is unreliable and SRST
355 * times out under certain configurations.
356 * Config device can be at port 0 or 5 and
360 link
->flags
|= ATA_LFLAG_NO_SRST
|
361 ATA_LFLAG_ASSUME_ATA
;
363 /* Port 6 is for SEMB device which doesn't
367 link
->flags
|= ATA_LFLAG_NO_SRST
|
368 ATA_LFLAG_ASSUME_SEMB
;
370 } else if (vendor
== 0x1095 && (devid
== 0x5723 || devid
== 0x5733 ||
371 devid
== 0x5734 || devid
== 0x5744)) {
372 /* sil5723/5744 quirks */
374 /* sil5723/5744 has either two or three downstream
375 * ports depending on operation mode. The last port
376 * is empty if any actual IO device is available or
377 * occupied by a pseudo configuration device
378 * otherwise. Don't try hard to recover it.
380 ap
->pmp_link
[ap
->nr_pmp_links
- 1].flags
|= ATA_LFLAG_NO_RETRY
;
385 * sata_pmp_attach - attach a SATA PMP device
386 * @dev: SATA PMP device to attach
388 * Configure and attach SATA PMP device @dev. This function is
389 * also responsible for allocating and initializing PMP links.
392 * Kernel thread context (may sleep).
395 * 0 on success, -errno on failure.
397 int sata_pmp_attach(struct ata_device
*dev
)
399 struct ata_link
*link
= dev
->link
;
400 struct ata_port
*ap
= link
->ap
;
402 struct ata_link
*tlink
;
405 /* is it hanging off the right place? */
406 if (!(ap
->flags
& ATA_FLAG_PMP
)) {
407 ata_dev_printk(dev
, KERN_ERR
,
408 "host does not support Port Multiplier\n");
412 if (!ata_is_host_link(link
)) {
413 ata_dev_printk(dev
, KERN_ERR
,
414 "Port Multipliers cannot be nested\n");
419 ata_dev_printk(dev
, KERN_ERR
,
420 "Port Multiplier must be the first device\n");
424 WARN_ON(link
->pmp
!= 0);
425 link
->pmp
= SATA_PMP_CTRL_PORT
;
427 /* read GSCR block */
428 rc
= sata_pmp_read_gscr(dev
, dev
->gscr
);
433 rc
= sata_pmp_configure(dev
, 1);
437 rc
= sata_pmp_init_links(ap
, sata_pmp_gscr_ports(dev
->gscr
));
439 ata_dev_printk(dev
, KERN_INFO
,
440 "failed to initialize PMP links\n");
445 spin_lock_irqsave(ap
->lock
, flags
);
446 WARN_ON(ap
->nr_pmp_links
);
447 ap
->nr_pmp_links
= sata_pmp_gscr_ports(dev
->gscr
);
448 spin_unlock_irqrestore(ap
->lock
, flags
);
452 if (ap
->ops
->pmp_attach
)
453 ap
->ops
->pmp_attach(ap
);
455 ata_port_for_each_link(tlink
, ap
)
456 sata_link_init_spd(tlink
);
458 ata_acpi_associate_sata_port(ap
);
468 * sata_pmp_detach - detach a SATA PMP device
469 * @dev: SATA PMP device to detach
471 * Detach SATA PMP device @dev. This function is also
472 * responsible for deconfiguring PMP links.
475 * Kernel thread context (may sleep).
477 static void sata_pmp_detach(struct ata_device
*dev
)
479 struct ata_link
*link
= dev
->link
;
480 struct ata_port
*ap
= link
->ap
;
481 struct ata_link
*tlink
;
484 ata_dev_printk(dev
, KERN_INFO
, "Port Multiplier detaching\n");
486 WARN_ON(!ata_is_host_link(link
) || dev
->devno
||
487 link
->pmp
!= SATA_PMP_CTRL_PORT
);
489 if (ap
->ops
->pmp_detach
)
490 ap
->ops
->pmp_detach(ap
);
492 ata_port_for_each_link(tlink
, ap
)
493 ata_eh_detach_dev(tlink
->device
);
495 spin_lock_irqsave(ap
->lock
, flags
);
496 ap
->nr_pmp_links
= 0;
498 spin_unlock_irqrestore(ap
->lock
, flags
);
500 ata_acpi_associate_sata_port(ap
);
504 * sata_pmp_same_pmp - does new GSCR matches the configured PMP?
505 * @dev: PMP device to compare against
506 * @new_gscr: GSCR block of the new device
508 * Compare @new_gscr against @dev and determine whether @dev is
509 * the PMP described by @new_gscr.
515 * 1 if @dev matches @new_gscr, 0 otherwise.
517 static int sata_pmp_same_pmp(struct ata_device
*dev
, const u32
*new_gscr
)
519 const u32
*old_gscr
= dev
->gscr
;
520 u16 old_vendor
, new_vendor
, old_devid
, new_devid
;
521 int old_nr_ports
, new_nr_ports
;
523 old_vendor
= sata_pmp_gscr_vendor(old_gscr
);
524 new_vendor
= sata_pmp_gscr_vendor(new_gscr
);
525 old_devid
= sata_pmp_gscr_devid(old_gscr
);
526 new_devid
= sata_pmp_gscr_devid(new_gscr
);
527 old_nr_ports
= sata_pmp_gscr_ports(old_gscr
);
528 new_nr_ports
= sata_pmp_gscr_ports(new_gscr
);
530 if (old_vendor
!= new_vendor
) {
531 ata_dev_printk(dev
, KERN_INFO
, "Port Multiplier "
532 "vendor mismatch '0x%x' != '0x%x'\n",
533 old_vendor
, new_vendor
);
537 if (old_devid
!= new_devid
) {
538 ata_dev_printk(dev
, KERN_INFO
, "Port Multiplier "
539 "device ID mismatch '0x%x' != '0x%x'\n",
540 old_devid
, new_devid
);
544 if (old_nr_ports
!= new_nr_ports
) {
545 ata_dev_printk(dev
, KERN_INFO
, "Port Multiplier "
546 "nr_ports mismatch '0x%x' != '0x%x'\n",
547 old_nr_ports
, new_nr_ports
);
555 * sata_pmp_revalidate - revalidate SATA PMP
556 * @dev: PMP device to revalidate
557 * @new_class: new class code
559 * Re-read GSCR block and make sure @dev is still attached to the
560 * port and properly configured.
563 * Kernel thread context (may sleep).
566 * 0 on success, -errno otherwise.
568 static int sata_pmp_revalidate(struct ata_device
*dev
, unsigned int new_class
)
570 struct ata_link
*link
= dev
->link
;
571 struct ata_port
*ap
= link
->ap
;
572 u32
*gscr
= (void *)ap
->sector_buf
;
577 ata_eh_about_to_do(link
, NULL
, ATA_EH_REVALIDATE
);
579 if (!ata_dev_enabled(dev
)) {
585 if (ata_class_enabled(new_class
) && new_class
!= ATA_DEV_PMP
) {
591 rc
= sata_pmp_read_gscr(dev
, gscr
);
595 /* is the pmp still there? */
596 if (!sata_pmp_same_pmp(dev
, gscr
)) {
601 memcpy(dev
->gscr
, gscr
, sizeof(gscr
[0]) * SATA_PMP_GSCR_DWORDS
);
603 rc
= sata_pmp_configure(dev
, 0);
607 ata_eh_done(link
, NULL
, ATA_EH_REVALIDATE
);
609 DPRINTK("EXIT, rc=0\n");
613 ata_dev_printk(dev
, KERN_ERR
,
614 "PMP revalidation failed (errno=%d)\n", rc
);
615 DPRINTK("EXIT, rc=%d\n", rc
);
620 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly
621 * @dev: PMP device to revalidate
623 * Make sure the attached PMP is accessible.
626 * Kernel thread context (may sleep).
629 * 0 on success, -errno otherwise.
631 static int sata_pmp_revalidate_quick(struct ata_device
*dev
)
633 unsigned int err_mask
;
636 err_mask
= sata_pmp_read(dev
->link
, SATA_PMP_GSCR_PROD_ID
, &prod_id
);
638 ata_dev_printk(dev
, KERN_ERR
, "failed to read PMP product ID "
639 "(Emask=0x%x)\n", err_mask
);
643 if (prod_id
!= dev
->gscr
[SATA_PMP_GSCR_PROD_ID
]) {
644 ata_dev_printk(dev
, KERN_ERR
, "PMP product ID mismatch\n");
645 /* something weird is going on, request full PMP recovery */
653 * sata_pmp_eh_recover_pmp - recover PMP
654 * @ap: ATA port PMP is attached to
655 * @prereset: prereset method (can be NULL)
656 * @softreset: softreset method
657 * @hardreset: hardreset method
658 * @postreset: postreset method (can be NULL)
660 * Recover PMP attached to @ap. Recovery procedure is somewhat
661 * similar to that of ata_eh_recover() except that reset should
662 * always be performed in hard->soft sequence and recovery
663 * failure results in PMP detachment.
666 * Kernel thread context (may sleep).
669 * 0 on success, -errno on failure.
671 static int sata_pmp_eh_recover_pmp(struct ata_port
*ap
,
672 ata_prereset_fn_t prereset
, ata_reset_fn_t softreset
,
673 ata_reset_fn_t hardreset
, ata_postreset_fn_t postreset
)
675 struct ata_link
*link
= &ap
->link
;
676 struct ata_eh_context
*ehc
= &link
->eh_context
;
677 struct ata_device
*dev
= link
->device
;
678 int tries
= ATA_EH_PMP_TRIES
;
679 int detach
= 0, rc
= 0;
680 int reval_failed
= 0;
684 if (dev
->flags
& ATA_DFLAG_DETACH
) {
690 ehc
->classes
[0] = ATA_DEV_UNKNOWN
;
692 if (ehc
->i
.action
& ATA_EH_RESET
) {
693 struct ata_link
*tlink
;
695 ata_eh_freeze_port(ap
);
698 rc
= ata_eh_reset(link
, 0, prereset
, softreset
, hardreset
,
701 ata_link_printk(link
, KERN_ERR
,
702 "failed to reset PMP, giving up\n");
706 ata_eh_thaw_port(ap
);
708 /* PMP is reset, SErrors cannot be trusted, scan all */
709 ata_port_for_each_link(tlink
, ap
) {
710 struct ata_eh_context
*ehc
= &tlink
->eh_context
;
712 ehc
->i
.probe_mask
|= ATA_ALL_DEVICES
;
713 ehc
->i
.action
|= ATA_EH_RESET
;
717 /* If revalidation is requested, revalidate and reconfigure;
718 * otherwise, do quick revalidation.
720 if (ehc
->i
.action
& ATA_EH_REVALIDATE
)
721 rc
= sata_pmp_revalidate(dev
, ehc
->classes
[0]);
723 rc
= sata_pmp_revalidate_quick(dev
);
729 ehc
->i
.probe_mask
|= ATA_ALL_DEVICES
;
731 /* give it just two more chances */
732 tries
= min(tries
, 2);
736 int sleep
= ehc
->i
.flags
& ATA_EHI_DID_RESET
;
738 /* consecutive revalidation failures? speed down */
740 sata_down_spd_limit(link
);
744 ata_dev_printk(dev
, KERN_WARNING
,
745 "retrying reset%s\n",
746 sleep
? " in 5 secs" : "");
749 ehc
->i
.action
|= ATA_EH_RESET
;
752 ata_dev_printk(dev
, KERN_ERR
, "failed to recover PMP "
753 "after %d tries, giving up\n",
759 /* okay, PMP resurrected */
762 DPRINTK("EXIT, rc=0\n");
766 sata_pmp_detach(dev
);
768 ata_eh_detach_dev(dev
);
770 ata_dev_disable(dev
);
772 DPRINTK("EXIT, rc=%d\n", rc
);
776 static int sata_pmp_eh_handle_disabled_links(struct ata_port
*ap
)
778 struct ata_link
*link
;
782 spin_lock_irqsave(ap
->lock
, flags
);
784 ata_port_for_each_link(link
, ap
) {
785 if (!(link
->flags
& ATA_LFLAG_DISABLED
))
788 spin_unlock_irqrestore(ap
->lock
, flags
);
790 /* Some PMPs require hardreset sequence to get
793 sata_link_hardreset(link
, sata_deb_timing_normal
,
794 jiffies
+ ATA_TMOUT_INTERNAL_QUICK
, NULL
, NULL
);
796 /* unconditionally clear SError.N */
797 rc
= sata_scr_write(link
, SCR_ERROR
, SERR_PHYRDY_CHG
);
799 ata_link_printk(link
, KERN_ERR
, "failed to clear "
800 "SError.N (errno=%d)\n", rc
);
804 spin_lock_irqsave(ap
->lock
, flags
);
807 spin_unlock_irqrestore(ap
->lock
, flags
);
812 static int sata_pmp_handle_link_fail(struct ata_link
*link
, int *link_tries
)
814 struct ata_port
*ap
= link
->ap
;
817 if (link_tries
[link
->pmp
] && --link_tries
[link
->pmp
])
820 /* disable this link */
821 if (!(link
->flags
& ATA_LFLAG_DISABLED
)) {
822 ata_link_printk(link
, KERN_WARNING
,
823 "failed to recover link after %d tries, disabling\n",
824 ATA_EH_PMP_LINK_TRIES
);
826 spin_lock_irqsave(ap
->lock
, flags
);
827 link
->flags
|= ATA_LFLAG_DISABLED
;
828 spin_unlock_irqrestore(ap
->lock
, flags
);
831 ata_dev_disable(link
->device
);
832 link
->eh_context
.i
.action
= 0;
838 * sata_pmp_eh_recover - recover PMP-enabled port
839 * @ap: ATA port to recover
841 * Drive EH recovery operation for PMP enabled port @ap. This
842 * function recovers host and PMP ports with proper retrials and
843 * fallbacks. Actual recovery operations are performed using
844 * ata_eh_recover() and sata_pmp_eh_recover_pmp().
847 * Kernel thread context (may sleep).
850 * 0 on success, -errno on failure.
852 static int sata_pmp_eh_recover(struct ata_port
*ap
)
854 struct ata_port_operations
*ops
= ap
->ops
;
855 int pmp_tries
, link_tries
[SATA_PMP_MAX_PORTS
];
856 struct ata_link
*pmp_link
= &ap
->link
;
857 struct ata_device
*pmp_dev
= pmp_link
->device
;
858 struct ata_eh_context
*pmp_ehc
= &pmp_link
->eh_context
;
859 struct ata_link
*link
;
860 struct ata_device
*dev
;
861 unsigned int err_mask
;
862 u32 gscr_error
, sntf
;
865 pmp_tries
= ATA_EH_PMP_TRIES
;
866 ata_port_for_each_link(link
, ap
)
867 link_tries
[link
->pmp
] = ATA_EH_PMP_LINK_TRIES
;
871 if (!ap
->nr_pmp_links
) {
872 rc
= ata_eh_recover(ap
, ops
->prereset
, ops
->softreset
,
873 ops
->hardreset
, ops
->postreset
, NULL
);
875 ata_link_for_each_dev(dev
, &ap
->link
)
876 ata_dev_disable(dev
);
880 if (pmp_dev
->class != ATA_DEV_PMP
)
884 ata_port_for_each_link(link
, ap
)
885 link_tries
[link
->pmp
] = ATA_EH_PMP_LINK_TRIES
;
891 rc
= sata_pmp_eh_recover_pmp(ap
, ops
->prereset
, ops
->softreset
,
892 ops
->hardreset
, ops
->postreset
);
896 /* handle disabled links */
897 rc
= sata_pmp_eh_handle_disabled_links(ap
);
902 rc
= ata_eh_recover(ap
, ops
->pmp_prereset
, ops
->pmp_softreset
,
903 ops
->pmp_hardreset
, ops
->pmp_postreset
, &link
);
907 /* Connection status might have changed while resetting other
908 * links, check SATA_PMP_GSCR_ERROR before returning.
911 /* clear SNotification */
912 rc
= sata_scr_read(&ap
->link
, SCR_NOTIFICATION
, &sntf
);
914 sata_scr_write(&ap
->link
, SCR_NOTIFICATION
, sntf
);
916 /* enable notification */
917 if (pmp_dev
->flags
& ATA_DFLAG_AN
) {
918 pmp_dev
->gscr
[SATA_PMP_GSCR_FEAT_EN
] |= SATA_PMP_FEAT_NOTIFY
;
920 err_mask
= sata_pmp_write(pmp_dev
->link
, SATA_PMP_GSCR_FEAT_EN
,
921 pmp_dev
->gscr
[SATA_PMP_GSCR_FEAT_EN
]);
923 ata_dev_printk(pmp_dev
, KERN_ERR
, "failed to write "
924 "PMP_FEAT_EN (Emask=0x%x)\n", err_mask
);
930 /* check GSCR_ERROR */
931 err_mask
= sata_pmp_read(pmp_link
, SATA_PMP_GSCR_ERROR
, &gscr_error
);
933 ata_dev_printk(pmp_dev
, KERN_ERR
, "failed to read "
934 "PMP_GSCR_ERROR (Emask=0x%x)\n", err_mask
);
940 ata_port_for_each_link(link
, ap
) {
941 if (!(gscr_error
& (1 << link
->pmp
)))
944 if (sata_pmp_handle_link_fail(link
, link_tries
)) {
945 ata_ehi_hotplugged(&link
->eh_context
.i
);
948 ata_link_printk(link
, KERN_WARNING
,
949 "PHY status changed but maxed out on retries, "
951 ata_link_printk(link
, KERN_WARNING
,
952 "Manully issue scan to resume this link\n");
957 ata_port_printk(ap
, KERN_INFO
, "PMP SError.N set for some "
958 "ports, repeating recovery\n");
965 if (sata_pmp_handle_link_fail(link
, link_tries
)) {
966 pmp_ehc
->i
.action
|= ATA_EH_RESET
;
972 /* Control always ends up here after detaching PMP. Shut up
973 * and return if we're unloading.
975 if (ap
->pflags
& ATA_PFLAG_UNLOADING
)
978 if (!ap
->nr_pmp_links
)
982 ata_port_printk(ap
, KERN_WARNING
,
983 "failed to recover PMP, retrying in 5 secs\n");
984 pmp_ehc
->i
.action
|= ATA_EH_RESET
;
989 ata_port_printk(ap
, KERN_ERR
,
990 "failed to recover PMP after %d tries, giving up\n",
992 sata_pmp_detach(pmp_dev
);
993 ata_dev_disable(pmp_dev
);
999 * sata_pmp_error_handler - do standard error handling for PMP-enabled host
1000 * @ap: host port to handle error for
1002 * Perform standard error handling sequence for PMP-enabled host
1006 * Kernel thread context (may sleep).
1008 void sata_pmp_error_handler(struct ata_port
*ap
)
1012 sata_pmp_eh_recover(ap
);