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/export.h>
12 #include <linux/libata.h>
13 #include <linux/slab.h>
15 #include "libata-transport.h"
17 const struct ata_port_operations sata_pmp_port_ops = {
18 .inherits = &sata_port_ops,
19 .pmp_prereset = ata_std_prereset,
20 .pmp_hardreset = sata_std_hardreset,
21 .pmp_postreset = ata_std_postreset,
22 .error_handler = sata_pmp_error_handler,
26 * sata_pmp_read - read PMP register
27 * @link: link to read PMP register for
28 * @reg: register to read
29 * @r_val: resulting value
34 * Kernel thread context (may sleep).
37 * 0 on success, AC_ERR_* mask on failure.
39 static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val)
41 struct ata_port *ap = link->ap;
42 struct ata_device *pmp_dev = ap->link.device;
43 struct ata_taskfile tf;
44 unsigned int err_mask;
46 ata_tf_init(pmp_dev, &tf);
47 tf.command = ATA_CMD_PMP_READ;
48 tf.protocol = ATA_PROT_NODATA;
49 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
51 tf.device = link->pmp;
53 err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
58 *r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24;
63 * sata_pmp_write - write PMP register
64 * @link: link to write PMP register for
65 * @reg: register to write
66 * @r_val: value to write
71 * Kernel thread context (may sleep).
74 * 0 on success, AC_ERR_* mask on failure.
76 static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val)
78 struct ata_port *ap = link->ap;
79 struct ata_device *pmp_dev = ap->link.device;
80 struct ata_taskfile tf;
82 ata_tf_init(pmp_dev, &tf);
83 tf.command = ATA_CMD_PMP_WRITE;
84 tf.protocol = ATA_PROT_NODATA;
85 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
87 tf.device = link->pmp;
88 tf.nsect = val & 0xff;
89 tf.lbal = (val >> 8) & 0xff;
90 tf.lbam = (val >> 16) & 0xff;
91 tf.lbah = (val >> 24) & 0xff;
93 return ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
98 * sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP
99 * @qc: ATA command in question
101 * A host which has command switching PMP support cannot issue
102 * commands to multiple links simultaneously.
105 * spin_lock_irqsave(host lock)
108 * ATA_DEFER_* if deferring is needed, 0 otherwise.
110 int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc)
112 struct ata_link *link = qc->dev->link;
113 struct ata_port *ap = link->ap;
115 if (ap->excl_link == NULL || ap->excl_link == link) {
116 if (ap->nr_active_links == 0 || ata_link_active(link)) {
117 qc->flags |= ATA_QCFLAG_CLEAR_EXCL;
118 return ata_std_qc_defer(qc);
121 ap->excl_link = link;
124 return ATA_DEFER_PORT;
128 * sata_pmp_scr_read - read PSCR
129 * @link: ATA link to read PSCR for
131 * @r_val: resulting value
133 * Read PSCR @reg into @r_val for @link, to be called from
137 * Kernel thread context (may sleep).
140 * 0 on success, -errno on failure.
142 int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val)
144 unsigned int err_mask;
146 if (reg > SATA_PMP_PSCR_CONTROL)
149 err_mask = sata_pmp_read(link, reg, r_val);
151 ata_link_warn(link, "failed to read SCR %d (Emask=0x%x)\n",
159 * sata_pmp_scr_write - write PSCR
160 * @link: ATA link to write PSCR for
161 * @reg: PSCR to write
162 * @val: value to be written
164 * Write @val to PSCR @reg for @link, to be called from
165 * ata_scr_write() and ata_scr_write_flush().
168 * Kernel thread context (may sleep).
171 * 0 on success, -errno on failure.
173 int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val)
175 unsigned int err_mask;
177 if (reg > SATA_PMP_PSCR_CONTROL)
180 err_mask = sata_pmp_write(link, reg, val);
182 ata_link_warn(link, "failed to write SCR %d (Emask=0x%x)\n",
190 * sata_pmp_set_lpm - configure LPM for a PMP link
191 * @link: PMP link to configure LPM for
192 * @policy: target LPM policy
195 * Configure LPM for @link. This function will contain any PMP
196 * specific workarounds if necessary.
202 * 0 on success, -errno on failure.
204 int sata_pmp_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
207 return sata_link_scr_lpm(link, policy, true);
211 * sata_pmp_read_gscr - read GSCR block of SATA PMP
213 * @gscr: buffer to read GSCR block into
215 * Read selected PMP GSCRs from the PMP at @dev. This will serve
216 * as configuration and identification info for the PMP.
219 * Kernel thread context (may sleep).
222 * 0 on success, -errno on failure.
224 static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr)
226 static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 };
229 for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) {
230 int reg = gscr_to_read[i];
231 unsigned int err_mask;
233 err_mask = sata_pmp_read(dev->link, reg, &gscr[reg]);
235 ata_dev_err(dev, "failed to read PMP GSCR[%d] (Emask=0x%x)\n",
244 static const char *sata_pmp_spec_rev_str(const u32 *gscr)
246 u32 rev = gscr[SATA_PMP_GSCR_REV];
257 #define PMP_GSCR_SII_POL 129
259 static int sata_pmp_configure(struct ata_device *dev, int print_info)
261 struct ata_port *ap = dev->link->ap;
262 u32 *gscr = dev->gscr;
263 u16 vendor = sata_pmp_gscr_vendor(gscr);
264 u16 devid = sata_pmp_gscr_devid(gscr);
265 unsigned int err_mask = 0;
269 nr_ports = sata_pmp_gscr_ports(gscr);
271 if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) {
273 reason = "invalid nr_ports";
277 if ((ap->flags & ATA_FLAG_AN) &&
278 (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY))
279 dev->flags |= ATA_DFLAG_AN;
281 /* monitor SERR_PHYRDY_CHG on fan-out ports */
282 err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN,
286 reason = "failed to write GSCR_ERROR_EN";
290 /* Disable sending Early R_OK.
291 * With "cached read" HDD testing and multiple ports busy on a SATA
292 * host controller, 3726 PMP will very rarely drop a deferred
293 * R_OK that was intended for the host. Symptom will be all
294 * 5 drives under test will timeout, get reset, and recover.
296 if (vendor == 0x1095 && devid == 0x3726) {
299 err_mask = sata_pmp_read(&ap->link, PMP_GSCR_SII_POL, ®);
302 reason = "failed to read Sil3726 Private Register";
306 err_mask = sata_pmp_write(&ap->link, PMP_GSCR_SII_POL, reg);
309 reason = "failed to write Sil3726 Private Register";
315 ata_dev_info(dev, "Port Multiplier %s, "
316 "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n",
317 sata_pmp_spec_rev_str(gscr), vendor, devid,
318 sata_pmp_gscr_rev(gscr),
319 nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN],
320 gscr[SATA_PMP_GSCR_FEAT]);
322 if (!(dev->flags & ATA_DFLAG_AN))
324 "Asynchronous notification not supported, "
325 "hotplug won't work on fan-out ports. Use warm-plug instead.\n");
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_err(dev, "host does not support Port Multiplier\n");
492 if (!ata_is_host_link(link)) {
493 ata_dev_err(dev, "Port Multipliers cannot be nested\n");
498 ata_dev_err(dev, "Port Multiplier must be the first device\n");
502 WARN_ON(link->pmp != 0);
503 link->pmp = SATA_PMP_CTRL_PORT;
505 /* read GSCR block */
506 rc = sata_pmp_read_gscr(dev, dev->gscr);
511 rc = sata_pmp_configure(dev, 1);
515 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr));
517 ata_dev_info(dev, "failed to initialize PMP links\n");
522 spin_lock_irqsave(ap->lock, flags);
523 WARN_ON(ap->nr_pmp_links);
524 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr);
525 spin_unlock_irqrestore(ap->lock, flags);
529 if (ap->ops->pmp_attach)
530 ap->ops->pmp_attach(ap);
532 ata_for_each_link(tlink, ap, EDGE)
533 sata_link_init_spd(tlink);
535 ata_acpi_associate_sata_port(ap);
545 * sata_pmp_detach - detach a SATA PMP device
546 * @dev: SATA PMP device to detach
548 * Detach SATA PMP device @dev. This function is also
549 * responsible for deconfiguring PMP links.
552 * Kernel thread context (may sleep).
554 static void sata_pmp_detach(struct ata_device *dev)
556 struct ata_link *link = dev->link;
557 struct ata_port *ap = link->ap;
558 struct ata_link *tlink;
561 ata_dev_info(dev, "Port Multiplier detaching\n");
563 WARN_ON(!ata_is_host_link(link) || dev->devno ||
564 link->pmp != SATA_PMP_CTRL_PORT);
566 if (ap->ops->pmp_detach)
567 ap->ops->pmp_detach(ap);
569 ata_for_each_link(tlink, ap, EDGE)
570 ata_eh_detach_dev(tlink->device);
572 spin_lock_irqsave(ap->lock, flags);
573 ap->nr_pmp_links = 0;
575 spin_unlock_irqrestore(ap->lock, flags);
577 ata_acpi_associate_sata_port(ap);
581 * sata_pmp_same_pmp - does new GSCR matches the configured PMP?
582 * @dev: PMP device to compare against
583 * @new_gscr: GSCR block of the new device
585 * Compare @new_gscr against @dev and determine whether @dev is
586 * the PMP described by @new_gscr.
592 * 1 if @dev matches @new_gscr, 0 otherwise.
594 static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr)
596 const u32 *old_gscr = dev->gscr;
597 u16 old_vendor, new_vendor, old_devid, new_devid;
598 int old_nr_ports, new_nr_ports;
600 old_vendor = sata_pmp_gscr_vendor(old_gscr);
601 new_vendor = sata_pmp_gscr_vendor(new_gscr);
602 old_devid = sata_pmp_gscr_devid(old_gscr);
603 new_devid = sata_pmp_gscr_devid(new_gscr);
604 old_nr_ports = sata_pmp_gscr_ports(old_gscr);
605 new_nr_ports = sata_pmp_gscr_ports(new_gscr);
607 if (old_vendor != new_vendor) {
609 "Port Multiplier vendor mismatch '0x%x' != '0x%x'\n",
610 old_vendor, new_vendor);
614 if (old_devid != new_devid) {
616 "Port Multiplier device ID mismatch '0x%x' != '0x%x'\n",
617 old_devid, new_devid);
621 if (old_nr_ports != new_nr_ports) {
623 "Port Multiplier nr_ports mismatch '0x%x' != '0x%x'\n",
624 old_nr_ports, new_nr_ports);
632 * sata_pmp_revalidate - revalidate SATA PMP
633 * @dev: PMP device to revalidate
634 * @new_class: new class code
636 * Re-read GSCR block and make sure @dev is still attached to the
637 * port and properly configured.
640 * Kernel thread context (may sleep).
643 * 0 on success, -errno otherwise.
645 static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class)
647 struct ata_link *link = dev->link;
648 struct ata_port *ap = link->ap;
649 u32 *gscr = (void *)ap->sector_buf;
654 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE);
656 if (!ata_dev_enabled(dev)) {
662 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) {
668 rc = sata_pmp_read_gscr(dev, gscr);
672 /* is the pmp still there? */
673 if (!sata_pmp_same_pmp(dev, gscr)) {
678 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS);
680 rc = sata_pmp_configure(dev, 0);
684 ata_eh_done(link, NULL, ATA_EH_REVALIDATE);
686 DPRINTK("EXIT, rc=0\n");
690 ata_dev_err(dev, "PMP revalidation failed (errno=%d)\n", rc);
691 DPRINTK("EXIT, rc=%d\n", rc);
696 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly
697 * @dev: PMP device to revalidate
699 * Make sure the attached PMP is accessible.
702 * Kernel thread context (may sleep).
705 * 0 on success, -errno otherwise.
707 static int sata_pmp_revalidate_quick(struct ata_device *dev)
709 unsigned int err_mask;
712 err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id);
715 "failed to read PMP product ID (Emask=0x%x)\n",
720 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) {
721 ata_dev_err(dev, "PMP product ID mismatch\n");
722 /* something weird is going on, request full PMP recovery */
730 * sata_pmp_eh_recover_pmp - recover PMP
731 * @ap: ATA port PMP is attached to
732 * @prereset: prereset method (can be NULL)
733 * @softreset: softreset method
734 * @hardreset: hardreset method
735 * @postreset: postreset method (can be NULL)
737 * Recover PMP attached to @ap. Recovery procedure is somewhat
738 * similar to that of ata_eh_recover() except that reset should
739 * always be performed in hard->soft sequence and recovery
740 * failure results in PMP detachment.
743 * Kernel thread context (may sleep).
746 * 0 on success, -errno on failure.
748 static int sata_pmp_eh_recover_pmp(struct ata_port *ap,
749 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
750 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
752 struct ata_link *link = &ap->link;
753 struct ata_eh_context *ehc = &link->eh_context;
754 struct ata_device *dev = link->device;
755 int tries = ATA_EH_PMP_TRIES;
756 int detach = 0, rc = 0;
757 int reval_failed = 0;
761 if (dev->flags & ATA_DFLAG_DETACH) {
767 ehc->classes[0] = ATA_DEV_UNKNOWN;
769 if (ehc->i.action & ATA_EH_RESET) {
770 struct ata_link *tlink;
773 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset,
776 ata_link_err(link, "failed to reset PMP, giving up\n");
780 /* PMP is reset, SErrors cannot be trusted, scan all */
781 ata_for_each_link(tlink, ap, EDGE) {
782 struct ata_eh_context *ehc = &tlink->eh_context;
784 ehc->i.probe_mask |= ATA_ALL_DEVICES;
785 ehc->i.action |= ATA_EH_RESET;
789 /* If revalidation is requested, revalidate and reconfigure;
790 * otherwise, do quick revalidation.
792 if (ehc->i.action & ATA_EH_REVALIDATE)
793 rc = sata_pmp_revalidate(dev, ehc->classes[0]);
795 rc = sata_pmp_revalidate_quick(dev);
801 ehc->i.probe_mask |= ATA_ALL_DEVICES;
803 /* give it just two more chances */
804 tries = min(tries, 2);
808 /* consecutive revalidation failures? speed down */
810 sata_down_spd_limit(link, 0);
814 ehc->i.action |= ATA_EH_RESET;
818 "failed to recover PMP after %d tries, giving up\n",
824 /* okay, PMP resurrected */
827 DPRINTK("EXIT, rc=0\n");
831 sata_pmp_detach(dev);
833 ata_eh_detach_dev(dev);
835 ata_dev_disable(dev);
837 DPRINTK("EXIT, rc=%d\n", rc);
841 static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap)
843 struct ata_link *link;
847 spin_lock_irqsave(ap->lock, flags);
849 ata_for_each_link(link, ap, EDGE) {
850 if (!(link->flags & ATA_LFLAG_DISABLED))
853 spin_unlock_irqrestore(ap->lock, flags);
855 /* Some PMPs require hardreset sequence to get
858 sata_link_hardreset(link, sata_deb_timing_normal,
859 ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK),
862 /* unconditionally clear SError.N */
863 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
866 "failed to clear SError.N (errno=%d)\n",
871 spin_lock_irqsave(ap->lock, flags);
874 spin_unlock_irqrestore(ap->lock, flags);
879 static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries)
881 struct ata_port *ap = link->ap;
884 if (link_tries[link->pmp] && --link_tries[link->pmp])
887 /* disable this link */
888 if (!(link->flags & ATA_LFLAG_DISABLED)) {
890 "failed to recover link after %d tries, disabling\n",
891 ATA_EH_PMP_LINK_TRIES);
893 spin_lock_irqsave(ap->lock, flags);
894 link->flags |= ATA_LFLAG_DISABLED;
895 spin_unlock_irqrestore(ap->lock, flags);
898 ata_dev_disable(link->device);
899 link->eh_context.i.action = 0;
905 * sata_pmp_eh_recover - recover PMP-enabled port
906 * @ap: ATA port to recover
908 * Drive EH recovery operation for PMP enabled port @ap. This
909 * function recovers host and PMP ports with proper retrials and
910 * fallbacks. Actual recovery operations are performed using
911 * ata_eh_recover() and sata_pmp_eh_recover_pmp().
914 * Kernel thread context (may sleep).
917 * 0 on success, -errno on failure.
919 static int sata_pmp_eh_recover(struct ata_port *ap)
921 struct ata_port_operations *ops = ap->ops;
922 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS];
923 struct ata_link *pmp_link = &ap->link;
924 struct ata_device *pmp_dev = pmp_link->device;
925 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context;
926 u32 *gscr = pmp_dev->gscr;
927 struct ata_link *link;
928 struct ata_device *dev;
929 unsigned int err_mask;
930 u32 gscr_error, sntf;
933 pmp_tries = ATA_EH_PMP_TRIES;
934 ata_for_each_link(link, ap, EDGE)
935 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
939 if (!sata_pmp_attached(ap)) {
940 rc = ata_eh_recover(ap, ops->prereset, ops->softreset,
941 ops->hardreset, ops->postreset, NULL);
943 ata_for_each_dev(dev, &ap->link, ALL)
944 ata_dev_disable(dev);
948 if (pmp_dev->class != ATA_DEV_PMP)
952 ata_for_each_link(link, ap, EDGE)
953 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
959 rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset,
960 ops->hardreset, ops->postreset);
964 /* PHY event notification can disturb reset and other recovery
965 * operations. Turn it off.
967 if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) {
968 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY;
970 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
971 gscr[SATA_PMP_GSCR_FEAT_EN]);
973 ata_link_warn(pmp_link,
974 "failed to disable NOTIFY (err_mask=0x%x)\n",
980 /* handle disabled links */
981 rc = sata_pmp_eh_handle_disabled_links(ap);
986 rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset,
987 ops->pmp_hardreset, ops->pmp_postreset, &link);
991 /* clear SNotification */
992 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
994 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
997 * If LPM is active on any fan-out port, hotplug wouldn't
998 * work. Return w/ PHY event notification disabled.
1000 ata_for_each_link(link, ap, EDGE)
1001 if (link->lpm_policy > ATA_LPM_MAX_POWER)
1005 * Connection status might have changed while resetting other
1006 * links, enable notification and check SATA_PMP_GSCR_ERROR
1010 /* enable notification */
1011 if (pmp_dev->flags & ATA_DFLAG_AN) {
1012 gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY;
1014 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
1015 gscr[SATA_PMP_GSCR_FEAT_EN]);
1017 ata_dev_err(pmp_dev,
1018 "failed to write PMP_FEAT_EN (Emask=0x%x)\n",
1025 /* check GSCR_ERROR */
1026 err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error);
1028 ata_dev_err(pmp_dev,
1029 "failed to read PMP_GSCR_ERROR (Emask=0x%x)\n",
1036 ata_for_each_link(link, ap, EDGE) {
1037 if (!(gscr_error & (1 << link->pmp)))
1040 if (sata_pmp_handle_link_fail(link, link_tries)) {
1041 ata_ehi_hotplugged(&link->eh_context.i);
1045 "PHY status changed but maxed out on retries, giving up\n");
1047 "Manually issue scan to resume this link\n");
1053 "PMP SError.N set for some ports, repeating recovery\n");
1060 if (sata_pmp_handle_link_fail(link, link_tries)) {
1061 pmp_ehc->i.action |= ATA_EH_RESET;
1067 /* Control always ends up here after detaching PMP. Shut up
1068 * and return if we're unloading.
1070 if (ap->pflags & ATA_PFLAG_UNLOADING)
1073 if (!sata_pmp_attached(ap))
1077 pmp_ehc->i.action |= ATA_EH_RESET;
1081 ata_port_err(ap, "failed to recover PMP after %d tries, giving up\n",
1083 sata_pmp_detach(pmp_dev);
1084 ata_dev_disable(pmp_dev);
1090 * sata_pmp_error_handler - do standard error handling for PMP-enabled host
1091 * @ap: host port to handle error for
1093 * Perform standard error handling sequence for PMP-enabled host
1097 * Kernel thread context (may sleep).
1099 void sata_pmp_error_handler(struct ata_port *ap)
1103 sata_pmp_eh_recover(ap);
1107 EXPORT_SYMBOL_GPL(sata_pmp_port_ops);
1108 EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
1109 EXPORT_SYMBOL_GPL(sata_pmp_error_handler);