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, 3x26 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 || devid == 0x3826)) {
299 err_mask = sata_pmp_read(&ap->link, PMP_GSCR_SII_POL, ®);
302 reason = "failed to read Sil3x26 Private Register";
306 err_mask = sata_pmp_write(&ap->link, PMP_GSCR_SII_POL, reg);
309 reason = "failed to write Sil3x26 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 || devid == 0x3826)) {
388 ata_for_each_link(link, ap, EDGE) {
389 /* link reports offline after LPM */
390 link->flags |= ATA_LFLAG_NO_LPM;
393 * Class code report is unreliable and SRST times
394 * out under certain configurations.
397 link->flags |= ATA_LFLAG_NO_SRST |
398 ATA_LFLAG_ASSUME_ATA;
400 /* port 5 is for SEMB device and it doesn't like SRST */
402 link->flags |= ATA_LFLAG_NO_SRST |
403 ATA_LFLAG_ASSUME_SEMB;
405 } else if (vendor == 0x1095 && devid == 0x4723) {
409 * Link reports offline after LPM. Class code report is
410 * unreliable. SIMG PMPs never got SRST reliable and the
411 * config device at port 2 locks up on SRST.
413 ata_for_each_link(link, ap, EDGE)
414 link->flags |= ATA_LFLAG_NO_LPM |
416 ATA_LFLAG_ASSUME_ATA;
417 } else if (vendor == 0x1095 && devid == 0x4726) {
419 ata_for_each_link(link, ap, EDGE) {
420 /* link reports offline after LPM */
421 link->flags |= ATA_LFLAG_NO_LPM;
423 /* Class code report is unreliable and SRST
424 * times out under certain configurations.
425 * Config device can be at port 0 or 5 and
429 link->flags |= ATA_LFLAG_NO_SRST |
430 ATA_LFLAG_ASSUME_ATA;
432 /* Port 6 is for SEMB device which doesn't
436 link->flags |= ATA_LFLAG_NO_SRST |
437 ATA_LFLAG_ASSUME_SEMB;
439 } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 ||
440 devid == 0x5734 || devid == 0x5744)) {
441 /* sil5723/5744 quirks */
443 /* sil5723/5744 has either two or three downstream
444 * ports depending on operation mode. The last port
445 * is empty if any actual IO device is available or
446 * occupied by a pseudo configuration device
447 * otherwise. Don't try hard to recover it.
449 ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY;
450 } else if (vendor == 0x197b && (devid == 0x2352 || devid == 0x0325)) {
452 * 0x2352: found in Thermaltake BlackX Duet, jmicron JMB350?
453 * 0x0325: jmicron JMB394.
455 ata_for_each_link(link, ap, EDGE) {
456 /* SRST breaks detection and disks get misclassified
457 * LPM disabled to avoid potential problems
459 link->flags |= ATA_LFLAG_NO_LPM |
461 ATA_LFLAG_ASSUME_ATA;
463 } else if (vendor == 0x11ab && devid == 0x4140) {
464 /* Marvell 4140 quirks */
465 ata_for_each_link(link, ap, EDGE) {
466 /* port 4 is for SEMB device and it doesn't like SRST */
468 link->flags |= ATA_LFLAG_DISABLED;
474 * sata_pmp_attach - attach a SATA PMP device
475 * @dev: SATA PMP device to attach
477 * Configure and attach SATA PMP device @dev. This function is
478 * also responsible for allocating and initializing PMP links.
481 * Kernel thread context (may sleep).
484 * 0 on success, -errno on failure.
486 int sata_pmp_attach(struct ata_device *dev)
488 struct ata_link *link = dev->link;
489 struct ata_port *ap = link->ap;
491 struct ata_link *tlink;
494 /* is it hanging off the right place? */
495 if (!sata_pmp_supported(ap)) {
496 ata_dev_err(dev, "host does not support Port Multiplier\n");
500 if (!ata_is_host_link(link)) {
501 ata_dev_err(dev, "Port Multipliers cannot be nested\n");
506 ata_dev_err(dev, "Port Multiplier must be the first device\n");
510 WARN_ON(link->pmp != 0);
511 link->pmp = SATA_PMP_CTRL_PORT;
513 /* read GSCR block */
514 rc = sata_pmp_read_gscr(dev, dev->gscr);
519 rc = sata_pmp_configure(dev, 1);
523 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr));
525 ata_dev_info(dev, "failed to initialize PMP links\n");
530 spin_lock_irqsave(ap->lock, flags);
531 WARN_ON(ap->nr_pmp_links);
532 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr);
533 spin_unlock_irqrestore(ap->lock, flags);
537 if (ap->ops->pmp_attach)
538 ap->ops->pmp_attach(ap);
540 ata_for_each_link(tlink, ap, EDGE)
541 sata_link_init_spd(tlink);
543 ata_acpi_associate_sata_port(ap);
553 * sata_pmp_detach - detach a SATA PMP device
554 * @dev: SATA PMP device to detach
556 * Detach SATA PMP device @dev. This function is also
557 * responsible for deconfiguring PMP links.
560 * Kernel thread context (may sleep).
562 static void sata_pmp_detach(struct ata_device *dev)
564 struct ata_link *link = dev->link;
565 struct ata_port *ap = link->ap;
566 struct ata_link *tlink;
569 ata_dev_info(dev, "Port Multiplier detaching\n");
571 WARN_ON(!ata_is_host_link(link) || dev->devno ||
572 link->pmp != SATA_PMP_CTRL_PORT);
574 if (ap->ops->pmp_detach)
575 ap->ops->pmp_detach(ap);
577 ata_for_each_link(tlink, ap, EDGE)
578 ata_eh_detach_dev(tlink->device);
580 spin_lock_irqsave(ap->lock, flags);
581 ap->nr_pmp_links = 0;
583 spin_unlock_irqrestore(ap->lock, flags);
585 ata_acpi_associate_sata_port(ap);
589 * sata_pmp_same_pmp - does new GSCR matches the configured PMP?
590 * @dev: PMP device to compare against
591 * @new_gscr: GSCR block of the new device
593 * Compare @new_gscr against @dev and determine whether @dev is
594 * the PMP described by @new_gscr.
600 * 1 if @dev matches @new_gscr, 0 otherwise.
602 static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr)
604 const u32 *old_gscr = dev->gscr;
605 u16 old_vendor, new_vendor, old_devid, new_devid;
606 int old_nr_ports, new_nr_ports;
608 old_vendor = sata_pmp_gscr_vendor(old_gscr);
609 new_vendor = sata_pmp_gscr_vendor(new_gscr);
610 old_devid = sata_pmp_gscr_devid(old_gscr);
611 new_devid = sata_pmp_gscr_devid(new_gscr);
612 old_nr_ports = sata_pmp_gscr_ports(old_gscr);
613 new_nr_ports = sata_pmp_gscr_ports(new_gscr);
615 if (old_vendor != new_vendor) {
617 "Port Multiplier vendor mismatch '0x%x' != '0x%x'\n",
618 old_vendor, new_vendor);
622 if (old_devid != new_devid) {
624 "Port Multiplier device ID mismatch '0x%x' != '0x%x'\n",
625 old_devid, new_devid);
629 if (old_nr_ports != new_nr_ports) {
631 "Port Multiplier nr_ports mismatch '0x%x' != '0x%x'\n",
632 old_nr_ports, new_nr_ports);
640 * sata_pmp_revalidate - revalidate SATA PMP
641 * @dev: PMP device to revalidate
642 * @new_class: new class code
644 * Re-read GSCR block and make sure @dev is still attached to the
645 * port and properly configured.
648 * Kernel thread context (may sleep).
651 * 0 on success, -errno otherwise.
653 static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class)
655 struct ata_link *link = dev->link;
656 struct ata_port *ap = link->ap;
657 u32 *gscr = (void *)ap->sector_buf;
662 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE);
664 if (!ata_dev_enabled(dev)) {
670 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) {
676 rc = sata_pmp_read_gscr(dev, gscr);
680 /* is the pmp still there? */
681 if (!sata_pmp_same_pmp(dev, gscr)) {
686 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS);
688 rc = sata_pmp_configure(dev, 0);
692 ata_eh_done(link, NULL, ATA_EH_REVALIDATE);
694 DPRINTK("EXIT, rc=0\n");
698 ata_dev_err(dev, "PMP revalidation failed (errno=%d)\n", rc);
699 DPRINTK("EXIT, rc=%d\n", rc);
704 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly
705 * @dev: PMP device to revalidate
707 * Make sure the attached PMP is accessible.
710 * Kernel thread context (may sleep).
713 * 0 on success, -errno otherwise.
715 static int sata_pmp_revalidate_quick(struct ata_device *dev)
717 unsigned int err_mask;
720 err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id);
723 "failed to read PMP product ID (Emask=0x%x)\n",
728 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) {
729 ata_dev_err(dev, "PMP product ID mismatch\n");
730 /* something weird is going on, request full PMP recovery */
738 * sata_pmp_eh_recover_pmp - recover PMP
739 * @ap: ATA port PMP is attached to
740 * @prereset: prereset method (can be NULL)
741 * @softreset: softreset method
742 * @hardreset: hardreset method
743 * @postreset: postreset method (can be NULL)
745 * Recover PMP attached to @ap. Recovery procedure is somewhat
746 * similar to that of ata_eh_recover() except that reset should
747 * always be performed in hard->soft sequence and recovery
748 * failure results in PMP detachment.
751 * Kernel thread context (may sleep).
754 * 0 on success, -errno on failure.
756 static int sata_pmp_eh_recover_pmp(struct ata_port *ap,
757 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
758 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
760 struct ata_link *link = &ap->link;
761 struct ata_eh_context *ehc = &link->eh_context;
762 struct ata_device *dev = link->device;
763 int tries = ATA_EH_PMP_TRIES;
764 int detach = 0, rc = 0;
765 int reval_failed = 0;
769 if (dev->flags & ATA_DFLAG_DETACH) {
775 ehc->classes[0] = ATA_DEV_UNKNOWN;
777 if (ehc->i.action & ATA_EH_RESET) {
778 struct ata_link *tlink;
781 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset,
784 ata_link_err(link, "failed to reset PMP, giving up\n");
788 /* PMP is reset, SErrors cannot be trusted, scan all */
789 ata_for_each_link(tlink, ap, EDGE) {
790 struct ata_eh_context *ehc = &tlink->eh_context;
792 ehc->i.probe_mask |= ATA_ALL_DEVICES;
793 ehc->i.action |= ATA_EH_RESET;
797 /* If revalidation is requested, revalidate and reconfigure;
798 * otherwise, do quick revalidation.
800 if (ehc->i.action & ATA_EH_REVALIDATE)
801 rc = sata_pmp_revalidate(dev, ehc->classes[0]);
803 rc = sata_pmp_revalidate_quick(dev);
809 ehc->i.probe_mask |= ATA_ALL_DEVICES;
811 /* give it just two more chances */
812 tries = min(tries, 2);
816 /* consecutive revalidation failures? speed down */
818 sata_down_spd_limit(link, 0);
822 ehc->i.action |= ATA_EH_RESET;
826 "failed to recover PMP after %d tries, giving up\n",
832 /* okay, PMP resurrected */
835 DPRINTK("EXIT, rc=0\n");
839 sata_pmp_detach(dev);
841 ata_eh_detach_dev(dev);
843 ata_dev_disable(dev);
845 DPRINTK("EXIT, rc=%d\n", rc);
849 static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap)
851 struct ata_link *link;
855 spin_lock_irqsave(ap->lock, flags);
857 ata_for_each_link(link, ap, EDGE) {
858 if (!(link->flags & ATA_LFLAG_DISABLED))
861 spin_unlock_irqrestore(ap->lock, flags);
863 /* Some PMPs require hardreset sequence to get
866 sata_link_hardreset(link, sata_deb_timing_normal,
867 ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK),
870 /* unconditionally clear SError.N */
871 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
874 "failed to clear SError.N (errno=%d)\n",
879 spin_lock_irqsave(ap->lock, flags);
882 spin_unlock_irqrestore(ap->lock, flags);
887 static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries)
889 struct ata_port *ap = link->ap;
892 if (link_tries[link->pmp] && --link_tries[link->pmp])
895 /* disable this link */
896 if (!(link->flags & ATA_LFLAG_DISABLED)) {
898 "failed to recover link after %d tries, disabling\n",
899 ATA_EH_PMP_LINK_TRIES);
901 spin_lock_irqsave(ap->lock, flags);
902 link->flags |= ATA_LFLAG_DISABLED;
903 spin_unlock_irqrestore(ap->lock, flags);
906 ata_dev_disable(link->device);
907 link->eh_context.i.action = 0;
913 * sata_pmp_eh_recover - recover PMP-enabled port
914 * @ap: ATA port to recover
916 * Drive EH recovery operation for PMP enabled port @ap. This
917 * function recovers host and PMP ports with proper retrials and
918 * fallbacks. Actual recovery operations are performed using
919 * ata_eh_recover() and sata_pmp_eh_recover_pmp().
922 * Kernel thread context (may sleep).
925 * 0 on success, -errno on failure.
927 static int sata_pmp_eh_recover(struct ata_port *ap)
929 struct ata_port_operations *ops = ap->ops;
930 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS];
931 struct ata_link *pmp_link = &ap->link;
932 struct ata_device *pmp_dev = pmp_link->device;
933 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context;
934 u32 *gscr = pmp_dev->gscr;
935 struct ata_link *link;
936 struct ata_device *dev;
937 unsigned int err_mask;
938 u32 gscr_error, sntf;
941 pmp_tries = ATA_EH_PMP_TRIES;
942 ata_for_each_link(link, ap, EDGE)
943 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
947 if (!sata_pmp_attached(ap)) {
948 rc = ata_eh_recover(ap, ops->prereset, ops->softreset,
949 ops->hardreset, ops->postreset, NULL);
951 ata_for_each_dev(dev, &ap->link, ALL)
952 ata_dev_disable(dev);
956 if (pmp_dev->class != ATA_DEV_PMP)
960 ata_for_each_link(link, ap, EDGE)
961 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
967 rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset,
968 ops->hardreset, ops->postreset);
972 /* PHY event notification can disturb reset and other recovery
973 * operations. Turn it off.
975 if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) {
976 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY;
978 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
979 gscr[SATA_PMP_GSCR_FEAT_EN]);
981 ata_link_warn(pmp_link,
982 "failed to disable NOTIFY (err_mask=0x%x)\n",
988 /* handle disabled links */
989 rc = sata_pmp_eh_handle_disabled_links(ap);
994 rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset,
995 ops->pmp_hardreset, ops->pmp_postreset, &link);
999 /* clear SNotification */
1000 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
1002 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
1005 * If LPM is active on any fan-out port, hotplug wouldn't
1006 * work. Return w/ PHY event notification disabled.
1008 ata_for_each_link(link, ap, EDGE)
1009 if (link->lpm_policy > ATA_LPM_MAX_POWER)
1013 * Connection status might have changed while resetting other
1014 * links, enable notification and check SATA_PMP_GSCR_ERROR
1018 /* enable notification */
1019 if (pmp_dev->flags & ATA_DFLAG_AN) {
1020 gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY;
1022 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
1023 gscr[SATA_PMP_GSCR_FEAT_EN]);
1025 ata_dev_err(pmp_dev,
1026 "failed to write PMP_FEAT_EN (Emask=0x%x)\n",
1033 /* check GSCR_ERROR */
1034 err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error);
1036 ata_dev_err(pmp_dev,
1037 "failed to read PMP_GSCR_ERROR (Emask=0x%x)\n",
1044 ata_for_each_link(link, ap, EDGE) {
1045 if (!(gscr_error & (1 << link->pmp)))
1048 if (sata_pmp_handle_link_fail(link, link_tries)) {
1049 ata_ehi_hotplugged(&link->eh_context.i);
1053 "PHY status changed but maxed out on retries, giving up\n");
1055 "Manually issue scan to resume this link\n");
1061 "PMP SError.N set for some ports, repeating recovery\n");
1068 if (sata_pmp_handle_link_fail(link, link_tries)) {
1069 pmp_ehc->i.action |= ATA_EH_RESET;
1075 /* Control always ends up here after detaching PMP. Shut up
1076 * and return if we're unloading.
1078 if (ap->pflags & ATA_PFLAG_UNLOADING)
1081 if (!sata_pmp_attached(ap))
1085 pmp_ehc->i.action |= ATA_EH_RESET;
1089 ata_port_err(ap, "failed to recover PMP after %d tries, giving up\n",
1091 sata_pmp_detach(pmp_dev);
1092 ata_dev_disable(pmp_dev);
1098 * sata_pmp_error_handler - do standard error handling for PMP-enabled host
1099 * @ap: host port to handle error for
1101 * Perform standard error handling sequence for PMP-enabled host
1105 * Kernel thread context (may sleep).
1107 void sata_pmp_error_handler(struct ata_port *ap)
1111 sata_pmp_eh_recover(ap);
1115 EXPORT_SYMBOL_GPL(sata_pmp_port_ops);
1116 EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
1117 EXPORT_SYMBOL_GPL(sata_pmp_error_handler);