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>
12 #include <linux/slab.h>
14 #include "libata-transport.h"
16 const struct ata_port_operations sata_pmp_port_ops = {
17 .inherits = &sata_port_ops,
18 .pmp_prereset = ata_std_prereset,
19 .pmp_hardreset = sata_std_hardreset,
20 .pmp_postreset = ata_std_postreset,
21 .error_handler = sata_pmp_error_handler,
25 * sata_pmp_read - read PMP register
26 * @link: link to read PMP register for
27 * @reg: register to read
28 * @r_val: resulting value
33 * Kernel thread context (may sleep).
36 * 0 on success, AC_ERR_* mask on failure.
38 static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val)
40 struct ata_port *ap = link->ap;
41 struct ata_device *pmp_dev = ap->link.device;
42 struct ata_taskfile tf;
43 unsigned int err_mask;
45 ata_tf_init(pmp_dev, &tf);
46 tf.command = ATA_CMD_PMP_READ;
47 tf.protocol = ATA_PROT_NODATA;
48 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
50 tf.device = link->pmp;
52 err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
57 *r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24;
62 * sata_pmp_write - write PMP register
63 * @link: link to write PMP register for
64 * @reg: register to write
65 * @r_val: value to write
70 * Kernel thread context (may sleep).
73 * 0 on success, AC_ERR_* mask on failure.
75 static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val)
77 struct ata_port *ap = link->ap;
78 struct ata_device *pmp_dev = ap->link.device;
79 struct ata_taskfile tf;
81 ata_tf_init(pmp_dev, &tf);
82 tf.command = ATA_CMD_PMP_WRITE;
83 tf.protocol = ATA_PROT_NODATA;
84 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
86 tf.device = link->pmp;
87 tf.nsect = val & 0xff;
88 tf.lbal = (val >> 8) & 0xff;
89 tf.lbam = (val >> 16) & 0xff;
90 tf.lbah = (val >> 24) & 0xff;
92 return ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
97 * sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP
98 * @qc: ATA command in question
100 * A host which has command switching PMP support cannot issue
101 * commands to multiple links simultaneously.
104 * spin_lock_irqsave(host lock)
107 * ATA_DEFER_* if deferring is needed, 0 otherwise.
109 int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc)
111 struct ata_link *link = qc->dev->link;
112 struct ata_port *ap = link->ap;
114 if (ap->excl_link == NULL || ap->excl_link == link) {
115 if (ap->nr_active_links == 0 || ata_link_active(link)) {
116 qc->flags |= ATA_QCFLAG_CLEAR_EXCL;
117 return ata_std_qc_defer(qc);
120 ap->excl_link = link;
123 return ATA_DEFER_PORT;
127 * sata_pmp_scr_read - read PSCR
128 * @link: ATA link to read PSCR for
130 * @r_val: resulting value
132 * Read PSCR @reg into @r_val for @link, to be called from
136 * Kernel thread context (may sleep).
139 * 0 on success, -errno on failure.
141 int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val)
143 unsigned int err_mask;
145 if (reg > SATA_PMP_PSCR_CONTROL)
148 err_mask = sata_pmp_read(link, reg, r_val);
150 ata_link_printk(link, KERN_WARNING, "failed to read SCR %d "
151 "(Emask=0x%x)\n", reg, err_mask);
158 * sata_pmp_scr_write - write PSCR
159 * @link: ATA link to write PSCR for
160 * @reg: PSCR to write
161 * @val: value to be written
163 * Write @val to PSCR @reg for @link, to be called from
164 * ata_scr_write() and ata_scr_write_flush().
167 * Kernel thread context (may sleep).
170 * 0 on success, -errno on failure.
172 int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val)
174 unsigned int err_mask;
176 if (reg > SATA_PMP_PSCR_CONTROL)
179 err_mask = sata_pmp_write(link, reg, val);
181 ata_link_printk(link, KERN_WARNING, "failed to write SCR %d "
182 "(Emask=0x%x)\n", reg, err_mask);
189 * sata_pmp_set_lpm - configure LPM for a PMP link
190 * @link: PMP link to configure LPM for
191 * @policy: target LPM policy
194 * Configure LPM for @link. This function will contain any PMP
195 * specific workarounds if necessary.
201 * 0 on success, -errno on failure.
203 int sata_pmp_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
206 return sata_link_scr_lpm(link, policy, true);
210 * sata_pmp_read_gscr - read GSCR block of SATA PMP
212 * @gscr: buffer to read GSCR block into
214 * Read selected PMP GSCRs from the PMP at @dev. This will serve
215 * as configuration and identification info for the PMP.
218 * Kernel thread context (may sleep).
221 * 0 on success, -errno on failure.
223 static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr)
225 static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 };
228 for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) {
229 int reg = gscr_to_read[i];
230 unsigned int err_mask;
232 err_mask = sata_pmp_read(dev->link, reg, &gscr[reg]);
234 ata_dev_printk(dev, KERN_ERR, "failed to read PMP "
235 "GSCR[%d] (Emask=0x%x)\n", reg, err_mask);
243 static const char *sata_pmp_spec_rev_str(const u32 *gscr)
245 u32 rev = gscr[SATA_PMP_GSCR_REV];
256 #define PMP_GSCR_SII_POL 129
258 static int sata_pmp_configure(struct ata_device *dev, int print_info)
260 struct ata_port *ap = dev->link->ap;
261 u32 *gscr = dev->gscr;
262 u16 vendor = sata_pmp_gscr_vendor(gscr);
263 u16 devid = sata_pmp_gscr_devid(gscr);
264 unsigned int err_mask = 0;
268 nr_ports = sata_pmp_gscr_ports(gscr);
270 if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) {
272 reason = "invalid nr_ports";
276 if ((ap->flags & ATA_FLAG_AN) &&
277 (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY))
278 dev->flags |= ATA_DFLAG_AN;
280 /* monitor SERR_PHYRDY_CHG on fan-out ports */
281 err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN,
285 reason = "failed to write GSCR_ERROR_EN";
289 /* Disable sending Early R_OK.
290 * With "cached read" HDD testing and multiple ports busy on a SATA
291 * host controller, 3726 PMP will very rarely drop a deferred
292 * R_OK that was intended for the host. Symptom will be all
293 * 5 drives under test will timeout, get reset, and recover.
295 if (vendor == 0x1095 && devid == 0x3726) {
298 err_mask = sata_pmp_read(&ap->link, PMP_GSCR_SII_POL, ®);
301 reason = "failed to read Sil3726 Private Register";
305 err_mask = sata_pmp_write(&ap->link, PMP_GSCR_SII_POL, reg);
308 reason = "failed to write Sil3726 Private Register";
314 ata_dev_printk(dev, KERN_INFO, "Port Multiplier %s, "
315 "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n",
316 sata_pmp_spec_rev_str(gscr), vendor, devid,
317 sata_pmp_gscr_rev(gscr),
318 nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN],
319 gscr[SATA_PMP_GSCR_FEAT]);
321 if (!(dev->flags & ATA_DFLAG_AN))
322 ata_dev_printk(dev, KERN_INFO,
323 "Asynchronous notification not supported, "
324 "hotplug won't\n work on fan-out "
325 "ports. Use warm-plug instead.\n");
331 ata_dev_printk(dev, KERN_ERR,
332 "failed to configure Port Multiplier (%s, Emask=0x%x)\n",
337 static int sata_pmp_init_links (struct ata_port *ap, int nr_ports)
339 struct ata_link *pmp_link = ap->pmp_link;
343 pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS,
348 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
349 ata_link_init(ap, &pmp_link[i], i);
351 ap->pmp_link = pmp_link;
353 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) {
354 err = ata_tlink_add(&pmp_link[i]);
361 for (i = 0; i < nr_ports; i++) {
362 struct ata_link *link = &pmp_link[i];
363 struct ata_eh_context *ehc = &link->eh_context;
366 ehc->i.probe_mask |= ATA_ALL_DEVICES;
367 ehc->i.action |= ATA_EH_RESET;
373 ata_tlink_delete(&pmp_link[i]);
379 static void sata_pmp_quirks(struct ata_port *ap)
381 u32 *gscr = ap->link.device->gscr;
382 u16 vendor = sata_pmp_gscr_vendor(gscr);
383 u16 devid = sata_pmp_gscr_devid(gscr);
384 struct ata_link *link;
386 if (vendor == 0x1095 && devid == 0x3726) {
388 ata_for_each_link(link, ap, EDGE) {
389 /* link reports offline after LPM */
390 link->flags |= ATA_LFLAG_NO_LPM;
392 /* Class code report is unreliable and SRST
393 * times out under certain configurations.
396 link->flags |= ATA_LFLAG_NO_SRST |
397 ATA_LFLAG_ASSUME_ATA;
399 /* port 5 is for SEMB device and it doesn't like SRST */
401 link->flags |= ATA_LFLAG_NO_SRST |
402 ATA_LFLAG_ASSUME_SEMB;
404 } else if (vendor == 0x1095 && devid == 0x4723) {
406 ata_for_each_link(link, ap, EDGE) {
407 /* link reports offline after LPM */
408 link->flags |= ATA_LFLAG_NO_LPM;
410 /* class code report is unreliable */
412 link->flags |= ATA_LFLAG_ASSUME_ATA;
414 /* the config device at port 2 locks up on SRST */
416 link->flags |= ATA_LFLAG_NO_SRST |
417 ATA_LFLAG_ASSUME_ATA;
419 } else if (vendor == 0x1095 && devid == 0x4726) {
421 ata_for_each_link(link, ap, EDGE) {
422 /* link reports offline after LPM */
423 link->flags |= ATA_LFLAG_NO_LPM;
425 /* Class code report is unreliable and SRST
426 * times out under certain configurations.
427 * Config device can be at port 0 or 5 and
431 link->flags |= ATA_LFLAG_NO_SRST |
432 ATA_LFLAG_ASSUME_ATA;
434 /* Port 6 is for SEMB device which doesn't
438 link->flags |= ATA_LFLAG_NO_SRST |
439 ATA_LFLAG_ASSUME_SEMB;
441 } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 ||
442 devid == 0x5734 || devid == 0x5744)) {
443 /* sil5723/5744 quirks */
445 /* sil5723/5744 has either two or three downstream
446 * ports depending on operation mode. The last port
447 * is empty if any actual IO device is available or
448 * occupied by a pseudo configuration device
449 * otherwise. Don't try hard to recover it.
451 ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY;
452 } else if (vendor == 0x197b && devid == 0x2352) {
453 /* chip found in Thermaltake BlackX Duet, jmicron JMB350? */
454 ata_for_each_link(link, ap, EDGE) {
455 /* SRST breaks detection and disks get misclassified
456 * LPM disabled to avoid potential problems
458 link->flags |= ATA_LFLAG_NO_LPM |
460 ATA_LFLAG_ASSUME_ATA;
466 * sata_pmp_attach - attach a SATA PMP device
467 * @dev: SATA PMP device to attach
469 * Configure and attach SATA PMP device @dev. This function is
470 * also responsible for allocating and initializing PMP links.
473 * Kernel thread context (may sleep).
476 * 0 on success, -errno on failure.
478 int sata_pmp_attach(struct ata_device *dev)
480 struct ata_link *link = dev->link;
481 struct ata_port *ap = link->ap;
483 struct ata_link *tlink;
486 /* is it hanging off the right place? */
487 if (!sata_pmp_supported(ap)) {
488 ata_dev_printk(dev, KERN_ERR,
489 "host does not support Port Multiplier\n");
493 if (!ata_is_host_link(link)) {
494 ata_dev_printk(dev, KERN_ERR,
495 "Port Multipliers cannot be nested\n");
500 ata_dev_printk(dev, KERN_ERR,
501 "Port Multiplier must be the first device\n");
505 WARN_ON(link->pmp != 0);
506 link->pmp = SATA_PMP_CTRL_PORT;
508 /* read GSCR block */
509 rc = sata_pmp_read_gscr(dev, dev->gscr);
514 rc = sata_pmp_configure(dev, 1);
518 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr));
520 ata_dev_printk(dev, KERN_INFO,
521 "failed to initialize PMP links\n");
526 spin_lock_irqsave(ap->lock, flags);
527 WARN_ON(ap->nr_pmp_links);
528 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr);
529 spin_unlock_irqrestore(ap->lock, flags);
533 if (ap->ops->pmp_attach)
534 ap->ops->pmp_attach(ap);
536 ata_for_each_link(tlink, ap, EDGE)
537 sata_link_init_spd(tlink);
539 ata_acpi_associate_sata_port(ap);
549 * sata_pmp_detach - detach a SATA PMP device
550 * @dev: SATA PMP device to detach
552 * Detach SATA PMP device @dev. This function is also
553 * responsible for deconfiguring PMP links.
556 * Kernel thread context (may sleep).
558 static void sata_pmp_detach(struct ata_device *dev)
560 struct ata_link *link = dev->link;
561 struct ata_port *ap = link->ap;
562 struct ata_link *tlink;
565 ata_dev_printk(dev, KERN_INFO, "Port Multiplier detaching\n");
567 WARN_ON(!ata_is_host_link(link) || dev->devno ||
568 link->pmp != SATA_PMP_CTRL_PORT);
570 if (ap->ops->pmp_detach)
571 ap->ops->pmp_detach(ap);
573 ata_for_each_link(tlink, ap, EDGE)
574 ata_eh_detach_dev(tlink->device);
576 spin_lock_irqsave(ap->lock, flags);
577 ap->nr_pmp_links = 0;
579 spin_unlock_irqrestore(ap->lock, flags);
581 ata_acpi_associate_sata_port(ap);
585 * sata_pmp_same_pmp - does new GSCR matches the configured PMP?
586 * @dev: PMP device to compare against
587 * @new_gscr: GSCR block of the new device
589 * Compare @new_gscr against @dev and determine whether @dev is
590 * the PMP described by @new_gscr.
596 * 1 if @dev matches @new_gscr, 0 otherwise.
598 static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr)
600 const u32 *old_gscr = dev->gscr;
601 u16 old_vendor, new_vendor, old_devid, new_devid;
602 int old_nr_ports, new_nr_ports;
604 old_vendor = sata_pmp_gscr_vendor(old_gscr);
605 new_vendor = sata_pmp_gscr_vendor(new_gscr);
606 old_devid = sata_pmp_gscr_devid(old_gscr);
607 new_devid = sata_pmp_gscr_devid(new_gscr);
608 old_nr_ports = sata_pmp_gscr_ports(old_gscr);
609 new_nr_ports = sata_pmp_gscr_ports(new_gscr);
611 if (old_vendor != new_vendor) {
612 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
613 "vendor mismatch '0x%x' != '0x%x'\n",
614 old_vendor, new_vendor);
618 if (old_devid != new_devid) {
619 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
620 "device ID mismatch '0x%x' != '0x%x'\n",
621 old_devid, new_devid);
625 if (old_nr_ports != new_nr_ports) {
626 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
627 "nr_ports mismatch '0x%x' != '0x%x'\n",
628 old_nr_ports, new_nr_ports);
636 * sata_pmp_revalidate - revalidate SATA PMP
637 * @dev: PMP device to revalidate
638 * @new_class: new class code
640 * Re-read GSCR block and make sure @dev is still attached to the
641 * port and properly configured.
644 * Kernel thread context (may sleep).
647 * 0 on success, -errno otherwise.
649 static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class)
651 struct ata_link *link = dev->link;
652 struct ata_port *ap = link->ap;
653 u32 *gscr = (void *)ap->sector_buf;
658 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE);
660 if (!ata_dev_enabled(dev)) {
666 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) {
672 rc = sata_pmp_read_gscr(dev, gscr);
676 /* is the pmp still there? */
677 if (!sata_pmp_same_pmp(dev, gscr)) {
682 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS);
684 rc = sata_pmp_configure(dev, 0);
688 ata_eh_done(link, NULL, ATA_EH_REVALIDATE);
690 DPRINTK("EXIT, rc=0\n");
694 ata_dev_printk(dev, KERN_ERR,
695 "PMP revalidation failed (errno=%d)\n", rc);
696 DPRINTK("EXIT, rc=%d\n", rc);
701 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly
702 * @dev: PMP device to revalidate
704 * Make sure the attached PMP is accessible.
707 * Kernel thread context (may sleep).
710 * 0 on success, -errno otherwise.
712 static int sata_pmp_revalidate_quick(struct ata_device *dev)
714 unsigned int err_mask;
717 err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id);
719 ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID "
720 "(Emask=0x%x)\n", err_mask);
724 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) {
725 ata_dev_printk(dev, KERN_ERR, "PMP product ID mismatch\n");
726 /* something weird is going on, request full PMP recovery */
734 * sata_pmp_eh_recover_pmp - recover PMP
735 * @ap: ATA port PMP is attached to
736 * @prereset: prereset method (can be NULL)
737 * @softreset: softreset method
738 * @hardreset: hardreset method
739 * @postreset: postreset method (can be NULL)
741 * Recover PMP attached to @ap. Recovery procedure is somewhat
742 * similar to that of ata_eh_recover() except that reset should
743 * always be performed in hard->soft sequence and recovery
744 * failure results in PMP detachment.
747 * Kernel thread context (may sleep).
750 * 0 on success, -errno on failure.
752 static int sata_pmp_eh_recover_pmp(struct ata_port *ap,
753 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
754 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
756 struct ata_link *link = &ap->link;
757 struct ata_eh_context *ehc = &link->eh_context;
758 struct ata_device *dev = link->device;
759 int tries = ATA_EH_PMP_TRIES;
760 int detach = 0, rc = 0;
761 int reval_failed = 0;
765 if (dev->flags & ATA_DFLAG_DETACH) {
771 ehc->classes[0] = ATA_DEV_UNKNOWN;
773 if (ehc->i.action & ATA_EH_RESET) {
774 struct ata_link *tlink;
777 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset,
780 ata_link_printk(link, KERN_ERR,
781 "failed to reset PMP, giving up\n");
785 /* PMP is reset, SErrors cannot be trusted, scan all */
786 ata_for_each_link(tlink, ap, EDGE) {
787 struct ata_eh_context *ehc = &tlink->eh_context;
789 ehc->i.probe_mask |= ATA_ALL_DEVICES;
790 ehc->i.action |= ATA_EH_RESET;
794 /* If revalidation is requested, revalidate and reconfigure;
795 * otherwise, do quick revalidation.
797 if (ehc->i.action & ATA_EH_REVALIDATE)
798 rc = sata_pmp_revalidate(dev, ehc->classes[0]);
800 rc = sata_pmp_revalidate_quick(dev);
806 ehc->i.probe_mask |= ATA_ALL_DEVICES;
808 /* give it just two more chances */
809 tries = min(tries, 2);
813 /* consecutive revalidation failures? speed down */
815 sata_down_spd_limit(link, 0);
819 ehc->i.action |= ATA_EH_RESET;
822 ata_dev_printk(dev, KERN_ERR, "failed to recover PMP "
823 "after %d tries, giving up\n",
829 /* okay, PMP resurrected */
832 DPRINTK("EXIT, rc=0\n");
836 sata_pmp_detach(dev);
838 ata_eh_detach_dev(dev);
840 ata_dev_disable(dev);
842 DPRINTK("EXIT, rc=%d\n", rc);
846 static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap)
848 struct ata_link *link;
852 spin_lock_irqsave(ap->lock, flags);
854 ata_for_each_link(link, ap, EDGE) {
855 if (!(link->flags & ATA_LFLAG_DISABLED))
858 spin_unlock_irqrestore(ap->lock, flags);
860 /* Some PMPs require hardreset sequence to get
863 sata_link_hardreset(link, sata_deb_timing_normal,
864 ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK),
867 /* unconditionally clear SError.N */
868 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
870 ata_link_printk(link, KERN_ERR, "failed to clear "
871 "SError.N (errno=%d)\n", rc);
875 spin_lock_irqsave(ap->lock, flags);
878 spin_unlock_irqrestore(ap->lock, flags);
883 static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries)
885 struct ata_port *ap = link->ap;
888 if (link_tries[link->pmp] && --link_tries[link->pmp])
891 /* disable this link */
892 if (!(link->flags & ATA_LFLAG_DISABLED)) {
893 ata_link_printk(link, KERN_WARNING,
894 "failed to recover link after %d tries, disabling\n",
895 ATA_EH_PMP_LINK_TRIES);
897 spin_lock_irqsave(ap->lock, flags);
898 link->flags |= ATA_LFLAG_DISABLED;
899 spin_unlock_irqrestore(ap->lock, flags);
902 ata_dev_disable(link->device);
903 link->eh_context.i.action = 0;
909 * sata_pmp_eh_recover - recover PMP-enabled port
910 * @ap: ATA port to recover
912 * Drive EH recovery operation for PMP enabled port @ap. This
913 * function recovers host and PMP ports with proper retrials and
914 * fallbacks. Actual recovery operations are performed using
915 * ata_eh_recover() and sata_pmp_eh_recover_pmp().
918 * Kernel thread context (may sleep).
921 * 0 on success, -errno on failure.
923 static int sata_pmp_eh_recover(struct ata_port *ap)
925 struct ata_port_operations *ops = ap->ops;
926 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS];
927 struct ata_link *pmp_link = &ap->link;
928 struct ata_device *pmp_dev = pmp_link->device;
929 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context;
930 u32 *gscr = pmp_dev->gscr;
931 struct ata_link *link;
932 struct ata_device *dev;
933 unsigned int err_mask;
934 u32 gscr_error, sntf;
937 pmp_tries = ATA_EH_PMP_TRIES;
938 ata_for_each_link(link, ap, EDGE)
939 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
943 if (!sata_pmp_attached(ap)) {
944 rc = ata_eh_recover(ap, ops->prereset, ops->softreset,
945 ops->hardreset, ops->postreset, NULL);
947 ata_for_each_dev(dev, &ap->link, ALL)
948 ata_dev_disable(dev);
952 if (pmp_dev->class != ATA_DEV_PMP)
956 ata_for_each_link(link, ap, EDGE)
957 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
963 rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset,
964 ops->hardreset, ops->postreset);
968 /* PHY event notification can disturb reset and other recovery
969 * operations. Turn it off.
971 if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) {
972 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY;
974 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
975 gscr[SATA_PMP_GSCR_FEAT_EN]);
977 ata_link_printk(pmp_link, KERN_WARNING,
978 "failed to disable NOTIFY (err_mask=0x%x)\n",
984 /* handle disabled links */
985 rc = sata_pmp_eh_handle_disabled_links(ap);
990 rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset,
991 ops->pmp_hardreset, ops->pmp_postreset, &link);
995 /* clear SNotification */
996 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
998 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
1001 * If LPM is active on any fan-out port, hotplug wouldn't
1002 * work. Return w/ PHY event notification disabled.
1004 ata_for_each_link(link, ap, EDGE)
1005 if (link->lpm_policy > ATA_LPM_MAX_POWER)
1009 * Connection status might have changed while resetting other
1010 * links, enable notification and check SATA_PMP_GSCR_ERROR
1014 /* enable notification */
1015 if (pmp_dev->flags & ATA_DFLAG_AN) {
1016 gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY;
1018 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
1019 gscr[SATA_PMP_GSCR_FEAT_EN]);
1021 ata_dev_printk(pmp_dev, KERN_ERR, "failed to write "
1022 "PMP_FEAT_EN (Emask=0x%x)\n", err_mask);
1028 /* check GSCR_ERROR */
1029 err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error);
1031 ata_dev_printk(pmp_dev, KERN_ERR, "failed to read "
1032 "PMP_GSCR_ERROR (Emask=0x%x)\n", err_mask);
1038 ata_for_each_link(link, ap, EDGE) {
1039 if (!(gscr_error & (1 << link->pmp)))
1042 if (sata_pmp_handle_link_fail(link, link_tries)) {
1043 ata_ehi_hotplugged(&link->eh_context.i);
1046 ata_link_printk(link, KERN_WARNING,
1047 "PHY status changed but maxed out on retries, "
1049 ata_link_printk(link, KERN_WARNING,
1050 "Manully issue scan to resume this link\n");
1055 ata_port_printk(ap, KERN_INFO, "PMP SError.N set for some "
1056 "ports, repeating recovery\n");
1063 if (sata_pmp_handle_link_fail(link, link_tries)) {
1064 pmp_ehc->i.action |= ATA_EH_RESET;
1070 /* Control always ends up here after detaching PMP. Shut up
1071 * and return if we're unloading.
1073 if (ap->pflags & ATA_PFLAG_UNLOADING)
1076 if (!sata_pmp_attached(ap))
1080 pmp_ehc->i.action |= ATA_EH_RESET;
1084 ata_port_printk(ap, KERN_ERR,
1085 "failed to recover PMP after %d tries, giving up\n",
1087 sata_pmp_detach(pmp_dev);
1088 ata_dev_disable(pmp_dev);
1094 * sata_pmp_error_handler - do standard error handling for PMP-enabled host
1095 * @ap: host port to handle error for
1097 * Perform standard error handling sequence for PMP-enabled host
1101 * Kernel thread context (may sleep).
1103 void sata_pmp_error_handler(struct ata_port *ap)
1107 sata_pmp_eh_recover(ap);
1111 EXPORT_SYMBOL_GPL(sata_pmp_port_ops);
1112 EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
1113 EXPORT_SYMBOL_GPL(sata_pmp_error_handler);