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;
456 * sata_pmp_attach - attach a SATA PMP device
457 * @dev: SATA PMP device to attach
459 * Configure and attach SATA PMP device @dev. This function is
460 * also responsible for allocating and initializing PMP links.
463 * Kernel thread context (may sleep).
466 * 0 on success, -errno on failure.
468 int sata_pmp_attach(struct ata_device *dev)
470 struct ata_link *link = dev->link;
471 struct ata_port *ap = link->ap;
473 struct ata_link *tlink;
476 /* is it hanging off the right place? */
477 if (!sata_pmp_supported(ap)) {
478 ata_dev_printk(dev, KERN_ERR,
479 "host does not support Port Multiplier\n");
483 if (!ata_is_host_link(link)) {
484 ata_dev_printk(dev, KERN_ERR,
485 "Port Multipliers cannot be nested\n");
490 ata_dev_printk(dev, KERN_ERR,
491 "Port Multiplier must be the first device\n");
495 WARN_ON(link->pmp != 0);
496 link->pmp = SATA_PMP_CTRL_PORT;
498 /* read GSCR block */
499 rc = sata_pmp_read_gscr(dev, dev->gscr);
504 rc = sata_pmp_configure(dev, 1);
508 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr));
510 ata_dev_printk(dev, KERN_INFO,
511 "failed to initialize PMP links\n");
516 spin_lock_irqsave(ap->lock, flags);
517 WARN_ON(ap->nr_pmp_links);
518 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr);
519 spin_unlock_irqrestore(ap->lock, flags);
523 if (ap->ops->pmp_attach)
524 ap->ops->pmp_attach(ap);
526 ata_for_each_link(tlink, ap, EDGE)
527 sata_link_init_spd(tlink);
529 ata_acpi_associate_sata_port(ap);
539 * sata_pmp_detach - detach a SATA PMP device
540 * @dev: SATA PMP device to detach
542 * Detach SATA PMP device @dev. This function is also
543 * responsible for deconfiguring PMP links.
546 * Kernel thread context (may sleep).
548 static void sata_pmp_detach(struct ata_device *dev)
550 struct ata_link *link = dev->link;
551 struct ata_port *ap = link->ap;
552 struct ata_link *tlink;
555 ata_dev_printk(dev, KERN_INFO, "Port Multiplier detaching\n");
557 WARN_ON(!ata_is_host_link(link) || dev->devno ||
558 link->pmp != SATA_PMP_CTRL_PORT);
560 if (ap->ops->pmp_detach)
561 ap->ops->pmp_detach(ap);
563 ata_for_each_link(tlink, ap, EDGE)
564 ata_eh_detach_dev(tlink->device);
566 spin_lock_irqsave(ap->lock, flags);
567 ap->nr_pmp_links = 0;
569 spin_unlock_irqrestore(ap->lock, flags);
571 ata_acpi_associate_sata_port(ap);
575 * sata_pmp_same_pmp - does new GSCR matches the configured PMP?
576 * @dev: PMP device to compare against
577 * @new_gscr: GSCR block of the new device
579 * Compare @new_gscr against @dev and determine whether @dev is
580 * the PMP described by @new_gscr.
586 * 1 if @dev matches @new_gscr, 0 otherwise.
588 static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr)
590 const u32 *old_gscr = dev->gscr;
591 u16 old_vendor, new_vendor, old_devid, new_devid;
592 int old_nr_ports, new_nr_ports;
594 old_vendor = sata_pmp_gscr_vendor(old_gscr);
595 new_vendor = sata_pmp_gscr_vendor(new_gscr);
596 old_devid = sata_pmp_gscr_devid(old_gscr);
597 new_devid = sata_pmp_gscr_devid(new_gscr);
598 old_nr_ports = sata_pmp_gscr_ports(old_gscr);
599 new_nr_ports = sata_pmp_gscr_ports(new_gscr);
601 if (old_vendor != new_vendor) {
602 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
603 "vendor mismatch '0x%x' != '0x%x'\n",
604 old_vendor, new_vendor);
608 if (old_devid != new_devid) {
609 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
610 "device ID mismatch '0x%x' != '0x%x'\n",
611 old_devid, new_devid);
615 if (old_nr_ports != new_nr_ports) {
616 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
617 "nr_ports mismatch '0x%x' != '0x%x'\n",
618 old_nr_ports, new_nr_ports);
626 * sata_pmp_revalidate - revalidate SATA PMP
627 * @dev: PMP device to revalidate
628 * @new_class: new class code
630 * Re-read GSCR block and make sure @dev is still attached to the
631 * port and properly configured.
634 * Kernel thread context (may sleep).
637 * 0 on success, -errno otherwise.
639 static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class)
641 struct ata_link *link = dev->link;
642 struct ata_port *ap = link->ap;
643 u32 *gscr = (void *)ap->sector_buf;
648 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE);
650 if (!ata_dev_enabled(dev)) {
656 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) {
662 rc = sata_pmp_read_gscr(dev, gscr);
666 /* is the pmp still there? */
667 if (!sata_pmp_same_pmp(dev, gscr)) {
672 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS);
674 rc = sata_pmp_configure(dev, 0);
678 ata_eh_done(link, NULL, ATA_EH_REVALIDATE);
680 DPRINTK("EXIT, rc=0\n");
684 ata_dev_printk(dev, KERN_ERR,
685 "PMP revalidation failed (errno=%d)\n", rc);
686 DPRINTK("EXIT, rc=%d\n", rc);
691 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly
692 * @dev: PMP device to revalidate
694 * Make sure the attached PMP is accessible.
697 * Kernel thread context (may sleep).
700 * 0 on success, -errno otherwise.
702 static int sata_pmp_revalidate_quick(struct ata_device *dev)
704 unsigned int err_mask;
707 err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id);
709 ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID "
710 "(Emask=0x%x)\n", err_mask);
714 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) {
715 ata_dev_printk(dev, KERN_ERR, "PMP product ID mismatch\n");
716 /* something weird is going on, request full PMP recovery */
724 * sata_pmp_eh_recover_pmp - recover PMP
725 * @ap: ATA port PMP is attached to
726 * @prereset: prereset method (can be NULL)
727 * @softreset: softreset method
728 * @hardreset: hardreset method
729 * @postreset: postreset method (can be NULL)
731 * Recover PMP attached to @ap. Recovery procedure is somewhat
732 * similar to that of ata_eh_recover() except that reset should
733 * always be performed in hard->soft sequence and recovery
734 * failure results in PMP detachment.
737 * Kernel thread context (may sleep).
740 * 0 on success, -errno on failure.
742 static int sata_pmp_eh_recover_pmp(struct ata_port *ap,
743 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
744 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
746 struct ata_link *link = &ap->link;
747 struct ata_eh_context *ehc = &link->eh_context;
748 struct ata_device *dev = link->device;
749 int tries = ATA_EH_PMP_TRIES;
750 int detach = 0, rc = 0;
751 int reval_failed = 0;
755 if (dev->flags & ATA_DFLAG_DETACH) {
761 ehc->classes[0] = ATA_DEV_UNKNOWN;
763 if (ehc->i.action & ATA_EH_RESET) {
764 struct ata_link *tlink;
767 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset,
770 ata_link_printk(link, KERN_ERR,
771 "failed to reset PMP, giving up\n");
775 /* PMP is reset, SErrors cannot be trusted, scan all */
776 ata_for_each_link(tlink, ap, EDGE) {
777 struct ata_eh_context *ehc = &tlink->eh_context;
779 ehc->i.probe_mask |= ATA_ALL_DEVICES;
780 ehc->i.action |= ATA_EH_RESET;
784 /* If revalidation is requested, revalidate and reconfigure;
785 * otherwise, do quick revalidation.
787 if (ehc->i.action & ATA_EH_REVALIDATE)
788 rc = sata_pmp_revalidate(dev, ehc->classes[0]);
790 rc = sata_pmp_revalidate_quick(dev);
796 ehc->i.probe_mask |= ATA_ALL_DEVICES;
798 /* give it just two more chances */
799 tries = min(tries, 2);
803 /* consecutive revalidation failures? speed down */
805 sata_down_spd_limit(link, 0);
809 ehc->i.action |= ATA_EH_RESET;
812 ata_dev_printk(dev, KERN_ERR, "failed to recover PMP "
813 "after %d tries, giving up\n",
819 /* okay, PMP resurrected */
822 DPRINTK("EXIT, rc=0\n");
826 sata_pmp_detach(dev);
828 ata_eh_detach_dev(dev);
830 ata_dev_disable(dev);
832 DPRINTK("EXIT, rc=%d\n", rc);
836 static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap)
838 struct ata_link *link;
842 spin_lock_irqsave(ap->lock, flags);
844 ata_for_each_link(link, ap, EDGE) {
845 if (!(link->flags & ATA_LFLAG_DISABLED))
848 spin_unlock_irqrestore(ap->lock, flags);
850 /* Some PMPs require hardreset sequence to get
853 sata_link_hardreset(link, sata_deb_timing_normal,
854 ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK),
857 /* unconditionally clear SError.N */
858 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
860 ata_link_printk(link, KERN_ERR, "failed to clear "
861 "SError.N (errno=%d)\n", rc);
865 spin_lock_irqsave(ap->lock, flags);
868 spin_unlock_irqrestore(ap->lock, flags);
873 static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries)
875 struct ata_port *ap = link->ap;
878 if (link_tries[link->pmp] && --link_tries[link->pmp])
881 /* disable this link */
882 if (!(link->flags & ATA_LFLAG_DISABLED)) {
883 ata_link_printk(link, KERN_WARNING,
884 "failed to recover link after %d tries, disabling\n",
885 ATA_EH_PMP_LINK_TRIES);
887 spin_lock_irqsave(ap->lock, flags);
888 link->flags |= ATA_LFLAG_DISABLED;
889 spin_unlock_irqrestore(ap->lock, flags);
892 ata_dev_disable(link->device);
893 link->eh_context.i.action = 0;
899 * sata_pmp_eh_recover - recover PMP-enabled port
900 * @ap: ATA port to recover
902 * Drive EH recovery operation for PMP enabled port @ap. This
903 * function recovers host and PMP ports with proper retrials and
904 * fallbacks. Actual recovery operations are performed using
905 * ata_eh_recover() and sata_pmp_eh_recover_pmp().
908 * Kernel thread context (may sleep).
911 * 0 on success, -errno on failure.
913 static int sata_pmp_eh_recover(struct ata_port *ap)
915 struct ata_port_operations *ops = ap->ops;
916 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS];
917 struct ata_link *pmp_link = &ap->link;
918 struct ata_device *pmp_dev = pmp_link->device;
919 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context;
920 u32 *gscr = pmp_dev->gscr;
921 struct ata_link *link;
922 struct ata_device *dev;
923 unsigned int err_mask;
924 u32 gscr_error, sntf;
927 pmp_tries = ATA_EH_PMP_TRIES;
928 ata_for_each_link(link, ap, EDGE)
929 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
933 if (!sata_pmp_attached(ap)) {
934 rc = ata_eh_recover(ap, ops->prereset, ops->softreset,
935 ops->hardreset, ops->postreset, NULL);
937 ata_for_each_dev(dev, &ap->link, ALL)
938 ata_dev_disable(dev);
942 if (pmp_dev->class != ATA_DEV_PMP)
946 ata_for_each_link(link, ap, EDGE)
947 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
953 rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset,
954 ops->hardreset, ops->postreset);
958 /* PHY event notification can disturb reset and other recovery
959 * operations. Turn it off.
961 if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) {
962 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY;
964 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
965 gscr[SATA_PMP_GSCR_FEAT_EN]);
967 ata_link_printk(pmp_link, KERN_WARNING,
968 "failed to disable NOTIFY (err_mask=0x%x)\n",
974 /* handle disabled links */
975 rc = sata_pmp_eh_handle_disabled_links(ap);
980 rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset,
981 ops->pmp_hardreset, ops->pmp_postreset, &link);
985 /* clear SNotification */
986 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
988 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
991 * If LPM is active on any fan-out port, hotplug wouldn't
992 * work. Return w/ PHY event notification disabled.
994 ata_for_each_link(link, ap, EDGE)
995 if (link->lpm_policy > ATA_LPM_MAX_POWER)
999 * Connection status might have changed while resetting other
1000 * links, enable notification and check SATA_PMP_GSCR_ERROR
1004 /* enable notification */
1005 if (pmp_dev->flags & ATA_DFLAG_AN) {
1006 gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY;
1008 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
1009 gscr[SATA_PMP_GSCR_FEAT_EN]);
1011 ata_dev_printk(pmp_dev, KERN_ERR, "failed to write "
1012 "PMP_FEAT_EN (Emask=0x%x)\n", err_mask);
1018 /* check GSCR_ERROR */
1019 err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error);
1021 ata_dev_printk(pmp_dev, KERN_ERR, "failed to read "
1022 "PMP_GSCR_ERROR (Emask=0x%x)\n", err_mask);
1028 ata_for_each_link(link, ap, EDGE) {
1029 if (!(gscr_error & (1 << link->pmp)))
1032 if (sata_pmp_handle_link_fail(link, link_tries)) {
1033 ata_ehi_hotplugged(&link->eh_context.i);
1036 ata_link_printk(link, KERN_WARNING,
1037 "PHY status changed but maxed out on retries, "
1039 ata_link_printk(link, KERN_WARNING,
1040 "Manully issue scan to resume this link\n");
1045 ata_port_printk(ap, KERN_INFO, "PMP SError.N set for some "
1046 "ports, repeating recovery\n");
1053 if (sata_pmp_handle_link_fail(link, link_tries)) {
1054 pmp_ehc->i.action |= ATA_EH_RESET;
1060 /* Control always ends up here after detaching PMP. Shut up
1061 * and return if we're unloading.
1063 if (ap->pflags & ATA_PFLAG_UNLOADING)
1066 if (!sata_pmp_attached(ap))
1070 pmp_ehc->i.action |= ATA_EH_RESET;
1074 ata_port_printk(ap, KERN_ERR,
1075 "failed to recover PMP after %d tries, giving up\n",
1077 sata_pmp_detach(pmp_dev);
1078 ata_dev_disable(pmp_dev);
1084 * sata_pmp_error_handler - do standard error handling for PMP-enabled host
1085 * @ap: host port to handle error for
1087 * Perform standard error handling sequence for PMP-enabled host
1091 * Kernel thread context (may sleep).
1093 void sata_pmp_error_handler(struct ata_port *ap)
1097 sata_pmp_eh_recover(ap);
1101 EXPORT_SYMBOL_GPL(sata_pmp_port_ops);
1102 EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
1103 EXPORT_SYMBOL_GPL(sata_pmp_error_handler);