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>
14 const struct ata_port_operations sata_pmp_port_ops = {
15 .inherits = &sata_port_ops,
16 .pmp_prereset = ata_std_prereset,
17 .pmp_hardreset = sata_std_hardreset,
18 .pmp_postreset = ata_std_postreset,
19 .error_handler = sata_pmp_error_handler,
23 * sata_pmp_read - read PMP register
24 * @link: link to read PMP register for
25 * @reg: register to read
26 * @r_val: resulting value
31 * Kernel thread context (may sleep).
34 * 0 on success, AC_ERR_* mask on failure.
36 static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val)
38 struct ata_port *ap = link->ap;
39 struct ata_device *pmp_dev = ap->link.device;
40 struct ata_taskfile tf;
41 unsigned int err_mask;
43 ata_tf_init(pmp_dev, &tf);
44 tf.command = ATA_CMD_PMP_READ;
45 tf.protocol = ATA_PROT_NODATA;
46 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
48 tf.device = link->pmp;
50 err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
55 *r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24;
60 * sata_pmp_write - write PMP register
61 * @link: link to write PMP register for
62 * @reg: register to write
63 * @r_val: value to write
68 * Kernel thread context (may sleep).
71 * 0 on success, AC_ERR_* mask on failure.
73 static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val)
75 struct ata_port *ap = link->ap;
76 struct ata_device *pmp_dev = ap->link.device;
77 struct ata_taskfile tf;
79 ata_tf_init(pmp_dev, &tf);
80 tf.command = ATA_CMD_PMP_WRITE;
81 tf.protocol = ATA_PROT_NODATA;
82 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
84 tf.device = link->pmp;
85 tf.nsect = val & 0xff;
86 tf.lbal = (val >> 8) & 0xff;
87 tf.lbam = (val >> 16) & 0xff;
88 tf.lbah = (val >> 24) & 0xff;
90 return ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
95 * sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP
96 * @qc: ATA command in question
98 * A host which has command switching PMP support cannot issue
99 * commands to multiple links simultaneously.
102 * spin_lock_irqsave(host lock)
105 * ATA_DEFER_* if deferring is needed, 0 otherwise.
107 int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc)
109 struct ata_link *link = qc->dev->link;
110 struct ata_port *ap = link->ap;
112 if (ap->excl_link == NULL || ap->excl_link == link) {
113 if (ap->nr_active_links == 0 || ata_link_active(link)) {
114 qc->flags |= ATA_QCFLAG_CLEAR_EXCL;
115 return ata_std_qc_defer(qc);
118 ap->excl_link = link;
121 return ATA_DEFER_PORT;
125 * sata_pmp_scr_read - read PSCR
126 * @link: ATA link to read PSCR for
128 * @r_val: resulting value
130 * Read PSCR @reg into @r_val for @link, to be called from
134 * Kernel thread context (may sleep).
137 * 0 on success, -errno on failure.
139 int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val)
141 unsigned int err_mask;
143 if (reg > SATA_PMP_PSCR_CONTROL)
146 err_mask = sata_pmp_read(link, reg, r_val);
148 ata_link_printk(link, KERN_WARNING, "failed to read SCR %d "
149 "(Emask=0x%x)\n", reg, err_mask);
156 * sata_pmp_scr_write - write PSCR
157 * @link: ATA link to write PSCR for
158 * @reg: PSCR to write
159 * @val: value to be written
161 * Write @val to PSCR @reg for @link, to be called from
162 * ata_scr_write() and ata_scr_write_flush().
165 * Kernel thread context (may sleep).
168 * 0 on success, -errno on failure.
170 int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val)
172 unsigned int err_mask;
174 if (reg > SATA_PMP_PSCR_CONTROL)
177 err_mask = sata_pmp_write(link, reg, val);
179 ata_link_printk(link, KERN_WARNING, "failed to write SCR %d "
180 "(Emask=0x%x)\n", reg, err_mask);
187 * sata_pmp_read_gscr - read GSCR block of SATA PMP
189 * @gscr: buffer to read GSCR block into
191 * Read selected PMP GSCRs from the PMP at @dev. This will serve
192 * as configuration and identification info for the PMP.
195 * Kernel thread context (may sleep).
198 * 0 on success, -errno on failure.
200 static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr)
202 static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 };
205 for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) {
206 int reg = gscr_to_read[i];
207 unsigned int err_mask;
209 err_mask = sata_pmp_read(dev->link, reg, &gscr[reg]);
211 ata_dev_printk(dev, KERN_ERR, "failed to read PMP "
212 "GSCR[%d] (Emask=0x%x)\n", reg, err_mask);
220 static const char *sata_pmp_spec_rev_str(const u32 *gscr)
222 u32 rev = gscr[SATA_PMP_GSCR_REV];
231 static int sata_pmp_configure(struct ata_device *dev, int print_info)
233 struct ata_port *ap = dev->link->ap;
234 u32 *gscr = dev->gscr;
235 unsigned int err_mask = 0;
239 nr_ports = sata_pmp_gscr_ports(gscr);
241 if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) {
243 reason = "invalid nr_ports";
247 if ((ap->flags & ATA_FLAG_AN) &&
248 (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY))
249 dev->flags |= ATA_DFLAG_AN;
251 /* monitor SERR_PHYRDY_CHG on fan-out ports */
252 err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN,
256 reason = "failed to write GSCR_ERROR_EN";
261 ata_dev_printk(dev, KERN_INFO, "Port Multiplier %s, "
262 "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n",
263 sata_pmp_spec_rev_str(gscr),
264 sata_pmp_gscr_vendor(gscr),
265 sata_pmp_gscr_devid(gscr),
266 sata_pmp_gscr_rev(gscr),
267 nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN],
268 gscr[SATA_PMP_GSCR_FEAT]);
270 if (!(dev->flags & ATA_DFLAG_AN))
271 ata_dev_printk(dev, KERN_INFO,
272 "Asynchronous notification not supported, "
273 "hotplug won't\n work on fan-out "
274 "ports. Use warm-plug instead.\n");
280 ata_dev_printk(dev, KERN_ERR,
281 "failed to configure Port Multiplier (%s, Emask=0x%x)\n",
286 static int sata_pmp_init_links(struct ata_port *ap, int nr_ports)
288 struct ata_link *pmp_link = ap->pmp_link;
292 pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS,
297 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
298 ata_link_init(ap, &pmp_link[i], i);
300 ap->pmp_link = pmp_link;
303 for (i = 0; i < nr_ports; i++) {
304 struct ata_link *link = &pmp_link[i];
305 struct ata_eh_context *ehc = &link->eh_context;
308 ehc->i.probe_mask |= ATA_ALL_DEVICES;
309 ehc->i.action |= ATA_EH_RESET;
315 static void sata_pmp_quirks(struct ata_port *ap)
317 u32 *gscr = ap->link.device->gscr;
318 u16 vendor = sata_pmp_gscr_vendor(gscr);
319 u16 devid = sata_pmp_gscr_devid(gscr);
320 struct ata_link *link;
322 if (vendor == 0x1095 && devid == 0x3726) {
324 ata_port_for_each_link(link, ap) {
325 /* Class code report is unreliable and SRST
326 * times out under certain configurations.
329 link->flags |= ATA_LFLAG_NO_SRST |
330 ATA_LFLAG_ASSUME_ATA;
332 /* port 5 is for SEMB device and it doesn't like SRST */
334 link->flags |= ATA_LFLAG_NO_SRST |
335 ATA_LFLAG_ASSUME_SEMB;
337 } else if (vendor == 0x1095 && devid == 0x4723) {
339 ata_port_for_each_link(link, ap) {
340 /* class code report is unreliable */
342 link->flags |= ATA_LFLAG_ASSUME_ATA;
344 /* the config device at port 2 locks up on SRST */
346 link->flags |= ATA_LFLAG_NO_SRST |
347 ATA_LFLAG_ASSUME_ATA;
349 } else if (vendor == 0x1095 && devid == 0x4726) {
351 ata_port_for_each_link(link, ap) {
352 /* Class code report is unreliable and SRST
353 * times out under certain configurations.
354 * Config device can be at port 0 or 5 and
358 link->flags |= ATA_LFLAG_NO_SRST |
359 ATA_LFLAG_ASSUME_ATA;
361 /* Port 6 is for SEMB device which doesn't
365 link->flags |= ATA_LFLAG_NO_SRST |
366 ATA_LFLAG_ASSUME_SEMB;
368 } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 ||
369 devid == 0x5734 || devid == 0x5744)) {
370 /* sil5723/5744 quirks */
372 /* sil5723/5744 has either two or three downstream
373 * ports depending on operation mode. The last port
374 * is empty if any actual IO device is available or
375 * occupied by a pseudo configuration device
376 * otherwise. Don't try hard to recover it.
378 ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY;
383 * sata_pmp_attach - attach a SATA PMP device
384 * @dev: SATA PMP device to attach
386 * Configure and attach SATA PMP device @dev. This function is
387 * also responsible for allocating and initializing PMP links.
390 * Kernel thread context (may sleep).
393 * 0 on success, -errno on failure.
395 int sata_pmp_attach(struct ata_device *dev)
397 struct ata_link *link = dev->link;
398 struct ata_port *ap = link->ap;
400 struct ata_link *tlink;
403 /* is it hanging off the right place? */
404 if (!sata_pmp_supported(ap)) {
405 ata_dev_printk(dev, KERN_ERR,
406 "host does not support Port Multiplier\n");
410 if (!ata_is_host_link(link)) {
411 ata_dev_printk(dev, KERN_ERR,
412 "Port Multipliers cannot be nested\n");
417 ata_dev_printk(dev, KERN_ERR,
418 "Port Multiplier must be the first device\n");
422 WARN_ON(link->pmp != 0);
423 link->pmp = SATA_PMP_CTRL_PORT;
425 /* read GSCR block */
426 rc = sata_pmp_read_gscr(dev, dev->gscr);
431 rc = sata_pmp_configure(dev, 1);
435 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr));
437 ata_dev_printk(dev, KERN_INFO,
438 "failed to initialize PMP links\n");
443 spin_lock_irqsave(ap->lock, flags);
444 WARN_ON(ap->nr_pmp_links);
445 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr);
446 spin_unlock_irqrestore(ap->lock, flags);
450 if (ap->ops->pmp_attach)
451 ap->ops->pmp_attach(ap);
453 ata_port_for_each_link(tlink, ap)
454 sata_link_init_spd(tlink);
456 ata_acpi_associate_sata_port(ap);
466 * sata_pmp_detach - detach a SATA PMP device
467 * @dev: SATA PMP device to detach
469 * Detach SATA PMP device @dev. This function is also
470 * responsible for deconfiguring PMP links.
473 * Kernel thread context (may sleep).
475 static void sata_pmp_detach(struct ata_device *dev)
477 struct ata_link *link = dev->link;
478 struct ata_port *ap = link->ap;
479 struct ata_link *tlink;
482 ata_dev_printk(dev, KERN_INFO, "Port Multiplier detaching\n");
484 WARN_ON(!ata_is_host_link(link) || dev->devno ||
485 link->pmp != SATA_PMP_CTRL_PORT);
487 if (ap->ops->pmp_detach)
488 ap->ops->pmp_detach(ap);
490 ata_port_for_each_link(tlink, ap)
491 ata_eh_detach_dev(tlink->device);
493 spin_lock_irqsave(ap->lock, flags);
494 ap->nr_pmp_links = 0;
496 spin_unlock_irqrestore(ap->lock, flags);
498 ata_acpi_associate_sata_port(ap);
502 * sata_pmp_same_pmp - does new GSCR matches the configured PMP?
503 * @dev: PMP device to compare against
504 * @new_gscr: GSCR block of the new device
506 * Compare @new_gscr against @dev and determine whether @dev is
507 * the PMP described by @new_gscr.
513 * 1 if @dev matches @new_gscr, 0 otherwise.
515 static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr)
517 const u32 *old_gscr = dev->gscr;
518 u16 old_vendor, new_vendor, old_devid, new_devid;
519 int old_nr_ports, new_nr_ports;
521 old_vendor = sata_pmp_gscr_vendor(old_gscr);
522 new_vendor = sata_pmp_gscr_vendor(new_gscr);
523 old_devid = sata_pmp_gscr_devid(old_gscr);
524 new_devid = sata_pmp_gscr_devid(new_gscr);
525 old_nr_ports = sata_pmp_gscr_ports(old_gscr);
526 new_nr_ports = sata_pmp_gscr_ports(new_gscr);
528 if (old_vendor != new_vendor) {
529 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
530 "vendor mismatch '0x%x' != '0x%x'\n",
531 old_vendor, new_vendor);
535 if (old_devid != new_devid) {
536 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
537 "device ID mismatch '0x%x' != '0x%x'\n",
538 old_devid, new_devid);
542 if (old_nr_ports != new_nr_ports) {
543 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
544 "nr_ports mismatch '0x%x' != '0x%x'\n",
545 old_nr_ports, new_nr_ports);
553 * sata_pmp_revalidate - revalidate SATA PMP
554 * @dev: PMP device to revalidate
555 * @new_class: new class code
557 * Re-read GSCR block and make sure @dev is still attached to the
558 * port and properly configured.
561 * Kernel thread context (may sleep).
564 * 0 on success, -errno otherwise.
566 static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class)
568 struct ata_link *link = dev->link;
569 struct ata_port *ap = link->ap;
570 u32 *gscr = (void *)ap->sector_buf;
575 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE);
577 if (!ata_dev_enabled(dev)) {
583 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) {
589 rc = sata_pmp_read_gscr(dev, gscr);
593 /* is the pmp still there? */
594 if (!sata_pmp_same_pmp(dev, gscr)) {
599 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS);
601 rc = sata_pmp_configure(dev, 0);
605 ata_eh_done(link, NULL, ATA_EH_REVALIDATE);
607 DPRINTK("EXIT, rc=0\n");
611 ata_dev_printk(dev, KERN_ERR,
612 "PMP revalidation failed (errno=%d)\n", rc);
613 DPRINTK("EXIT, rc=%d\n", rc);
618 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly
619 * @dev: PMP device to revalidate
621 * Make sure the attached PMP is accessible.
624 * Kernel thread context (may sleep).
627 * 0 on success, -errno otherwise.
629 static int sata_pmp_revalidate_quick(struct ata_device *dev)
631 unsigned int err_mask;
634 err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id);
636 ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID "
637 "(Emask=0x%x)\n", err_mask);
641 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) {
642 ata_dev_printk(dev, KERN_ERR, "PMP product ID mismatch\n");
643 /* something weird is going on, request full PMP recovery */
651 * sata_pmp_eh_recover_pmp - recover PMP
652 * @ap: ATA port PMP is attached to
653 * @prereset: prereset method (can be NULL)
654 * @softreset: softreset method
655 * @hardreset: hardreset method
656 * @postreset: postreset method (can be NULL)
658 * Recover PMP attached to @ap. Recovery procedure is somewhat
659 * similar to that of ata_eh_recover() except that reset should
660 * always be performed in hard->soft sequence and recovery
661 * failure results in PMP detachment.
664 * Kernel thread context (may sleep).
667 * 0 on success, -errno on failure.
669 static int sata_pmp_eh_recover_pmp(struct ata_port *ap,
670 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
671 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
673 struct ata_link *link = &ap->link;
674 struct ata_eh_context *ehc = &link->eh_context;
675 struct ata_device *dev = link->device;
676 int tries = ATA_EH_PMP_TRIES;
677 int detach = 0, rc = 0;
678 int reval_failed = 0;
682 if (dev->flags & ATA_DFLAG_DETACH) {
688 ehc->classes[0] = ATA_DEV_UNKNOWN;
690 if (ehc->i.action & ATA_EH_RESET) {
691 struct ata_link *tlink;
694 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset,
697 ata_link_printk(link, KERN_ERR,
698 "failed to reset PMP, giving up\n");
702 /* PMP is reset, SErrors cannot be trusted, scan all */
703 ata_port_for_each_link(tlink, ap) {
704 struct ata_eh_context *ehc = &tlink->eh_context;
706 ehc->i.probe_mask |= ATA_ALL_DEVICES;
707 ehc->i.action |= ATA_EH_RESET;
711 /* If revalidation is requested, revalidate and reconfigure;
712 * otherwise, do quick revalidation.
714 if (ehc->i.action & ATA_EH_REVALIDATE)
715 rc = sata_pmp_revalidate(dev, ehc->classes[0]);
717 rc = sata_pmp_revalidate_quick(dev);
723 ehc->i.probe_mask |= ATA_ALL_DEVICES;
725 /* give it just two more chances */
726 tries = min(tries, 2);
730 int sleep = ehc->i.flags & ATA_EHI_DID_RESET;
732 /* consecutive revalidation failures? speed down */
734 sata_down_spd_limit(link);
738 ata_dev_printk(dev, KERN_WARNING,
739 "retrying reset%s\n",
740 sleep ? " in 5 secs" : "");
743 ehc->i.action |= ATA_EH_RESET;
746 ata_dev_printk(dev, KERN_ERR, "failed to recover PMP "
747 "after %d tries, giving up\n",
753 /* okay, PMP resurrected */
756 DPRINTK("EXIT, rc=0\n");
760 sata_pmp_detach(dev);
762 ata_eh_detach_dev(dev);
764 ata_dev_disable(dev);
766 DPRINTK("EXIT, rc=%d\n", rc);
770 static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap)
772 struct ata_link *link;
776 spin_lock_irqsave(ap->lock, flags);
778 ata_port_for_each_link(link, ap) {
779 if (!(link->flags & ATA_LFLAG_DISABLED))
782 spin_unlock_irqrestore(ap->lock, flags);
784 /* Some PMPs require hardreset sequence to get
787 sata_link_hardreset(link, sata_deb_timing_normal,
788 jiffies + ATA_TMOUT_INTERNAL_QUICK, NULL, NULL);
790 /* unconditionally clear SError.N */
791 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
793 ata_link_printk(link, KERN_ERR, "failed to clear "
794 "SError.N (errno=%d)\n", rc);
798 spin_lock_irqsave(ap->lock, flags);
801 spin_unlock_irqrestore(ap->lock, flags);
806 static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries)
808 struct ata_port *ap = link->ap;
811 if (link_tries[link->pmp] && --link_tries[link->pmp])
814 /* disable this link */
815 if (!(link->flags & ATA_LFLAG_DISABLED)) {
816 ata_link_printk(link, KERN_WARNING,
817 "failed to recover link after %d tries, disabling\n",
818 ATA_EH_PMP_LINK_TRIES);
820 spin_lock_irqsave(ap->lock, flags);
821 link->flags |= ATA_LFLAG_DISABLED;
822 spin_unlock_irqrestore(ap->lock, flags);
825 ata_dev_disable(link->device);
826 link->eh_context.i.action = 0;
832 * sata_pmp_eh_recover - recover PMP-enabled port
833 * @ap: ATA port to recover
835 * Drive EH recovery operation for PMP enabled port @ap. This
836 * function recovers host and PMP ports with proper retrials and
837 * fallbacks. Actual recovery operations are performed using
838 * ata_eh_recover() and sata_pmp_eh_recover_pmp().
841 * Kernel thread context (may sleep).
844 * 0 on success, -errno on failure.
846 static int sata_pmp_eh_recover(struct ata_port *ap)
848 struct ata_port_operations *ops = ap->ops;
849 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS];
850 struct ata_link *pmp_link = &ap->link;
851 struct ata_device *pmp_dev = pmp_link->device;
852 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context;
853 u32 *gscr = pmp_dev->gscr;
854 struct ata_link *link;
855 struct ata_device *dev;
856 unsigned int err_mask;
857 u32 gscr_error, sntf;
860 pmp_tries = ATA_EH_PMP_TRIES;
861 ata_port_for_each_link(link, ap)
862 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
866 if (!sata_pmp_attached(ap)) {
867 rc = ata_eh_recover(ap, ops->prereset, ops->softreset,
868 ops->hardreset, ops->postreset, NULL);
870 ata_link_for_each_dev(dev, &ap->link)
871 ata_dev_disable(dev);
875 if (pmp_dev->class != ATA_DEV_PMP)
879 ata_port_for_each_link(link, ap)
880 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
886 rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset,
887 ops->hardreset, ops->postreset);
891 /* PHY event notification can disturb reset and other recovery
892 * operations. Turn it off.
894 if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) {
895 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY;
897 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
898 gscr[SATA_PMP_GSCR_FEAT_EN]);
900 ata_link_printk(pmp_link, KERN_WARNING,
901 "failed to disable NOTIFY (err_mask=0x%x)\n",
907 /* handle disabled links */
908 rc = sata_pmp_eh_handle_disabled_links(ap);
913 rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset,
914 ops->pmp_hardreset, ops->pmp_postreset, &link);
918 /* Connection status might have changed while resetting other
919 * links, check SATA_PMP_GSCR_ERROR before returning.
922 /* clear SNotification */
923 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
925 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
927 /* enable notification */
928 if (pmp_dev->flags & ATA_DFLAG_AN) {
929 gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY;
931 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
932 gscr[SATA_PMP_GSCR_FEAT_EN]);
934 ata_dev_printk(pmp_dev, KERN_ERR, "failed to write "
935 "PMP_FEAT_EN (Emask=0x%x)\n", err_mask);
941 /* check GSCR_ERROR */
942 err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error);
944 ata_dev_printk(pmp_dev, KERN_ERR, "failed to read "
945 "PMP_GSCR_ERROR (Emask=0x%x)\n", err_mask);
951 ata_port_for_each_link(link, ap) {
952 if (!(gscr_error & (1 << link->pmp)))
955 if (sata_pmp_handle_link_fail(link, link_tries)) {
956 ata_ehi_hotplugged(&link->eh_context.i);
959 ata_link_printk(link, KERN_WARNING,
960 "PHY status changed but maxed out on retries, "
962 ata_link_printk(link, KERN_WARNING,
963 "Manully issue scan to resume this link\n");
968 ata_port_printk(ap, KERN_INFO, "PMP SError.N set for some "
969 "ports, repeating recovery\n");
976 if (sata_pmp_handle_link_fail(link, link_tries)) {
977 pmp_ehc->i.action |= ATA_EH_RESET;
983 /* Control always ends up here after detaching PMP. Shut up
984 * and return if we're unloading.
986 if (ap->pflags & ATA_PFLAG_UNLOADING)
989 if (!sata_pmp_attached(ap))
993 ata_port_printk(ap, KERN_WARNING,
994 "failed to recover PMP, retrying in 5 secs\n");
995 pmp_ehc->i.action |= ATA_EH_RESET;
1000 ata_port_printk(ap, KERN_ERR,
1001 "failed to recover PMP after %d tries, giving up\n",
1003 sata_pmp_detach(pmp_dev);
1004 ata_dev_disable(pmp_dev);
1010 * sata_pmp_error_handler - do standard error handling for PMP-enabled host
1011 * @ap: host port to handle error for
1013 * Perform standard error handling sequence for PMP-enabled host
1017 * Kernel thread context (may sleep).
1019 void sata_pmp_error_handler(struct ata_port *ap)
1023 sata_pmp_eh_recover(ap);
1027 EXPORT_SYMBOL_GPL(sata_pmp_port_ops);
1028 EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
1029 EXPORT_SYMBOL_GPL(sata_pmp_error_handler);