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"
17 * Set to 1 to allow enumeration of devices behind PMP links
19 unsigned int sata_pmp_allow_link_enumeration_flag = 0;
21 const struct ata_port_operations sata_pmp_port_ops = {
22 .inherits = &sata_port_ops,
23 .pmp_prereset = ata_std_prereset,
24 .pmp_hardreset = sata_std_hardreset,
25 .pmp_postreset = ata_std_postreset,
26 .error_handler = sata_pmp_error_handler,
30 * sata_pmp_read - read PMP register
31 * @link: link to read PMP register for
32 * @reg: register to read
33 * @r_val: resulting value
38 * Kernel thread context (may sleep).
41 * 0 on success, AC_ERR_* mask on failure.
43 static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val)
45 struct ata_port *ap = link->ap;
46 struct ata_device *pmp_dev = ap->link.device;
47 struct ata_taskfile tf;
48 unsigned int err_mask;
50 ata_tf_init(pmp_dev, &tf);
51 tf.command = ATA_CMD_PMP_READ;
52 tf.protocol = ATA_PROT_NODATA;
53 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
55 tf.device = link->pmp;
57 err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
62 *r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24;
67 * sata_pmp_write - write PMP register
68 * @link: link to write PMP register for
69 * @reg: register to write
70 * @r_val: value to write
75 * Kernel thread context (may sleep).
78 * 0 on success, AC_ERR_* mask on failure.
80 static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val)
82 struct ata_port *ap = link->ap;
83 struct ata_device *pmp_dev = ap->link.device;
84 struct ata_taskfile tf;
86 ata_tf_init(pmp_dev, &tf);
87 tf.command = ATA_CMD_PMP_WRITE;
88 tf.protocol = ATA_PROT_NODATA;
89 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
91 tf.device = link->pmp;
92 tf.nsect = val & 0xff;
93 tf.lbal = (val >> 8) & 0xff;
94 tf.lbam = (val >> 16) & 0xff;
95 tf.lbah = (val >> 24) & 0xff;
97 return ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
102 * sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP
103 * @qc: ATA command in question
105 * A host which has command switching PMP support cannot issue
106 * commands to multiple links simultaneously.
109 * spin_lock_irqsave(host lock)
112 * ATA_DEFER_* if deferring is needed, 0 otherwise.
114 int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc)
116 struct ata_link *link = qc->dev->link;
117 struct ata_port *ap = link->ap;
119 if (ap->excl_link == NULL || ap->excl_link == link) {
120 if (ap->nr_active_links == 0 || ata_link_active(link)) {
121 qc->flags |= ATA_QCFLAG_CLEAR_EXCL;
122 return ata_std_qc_defer(qc);
125 ap->excl_link = link;
128 return ATA_DEFER_PORT;
132 * sata_pmp_scr_read - read PSCR
133 * @link: ATA link to read PSCR for
135 * @r_val: resulting value
137 * Read PSCR @reg into @r_val for @link, to be called from
141 * Kernel thread context (may sleep).
144 * 0 on success, -errno on failure.
146 int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val)
148 unsigned int err_mask;
150 if (reg > SATA_PMP_PSCR_CONTROL)
153 err_mask = sata_pmp_read(link, reg, r_val);
155 ata_link_printk(link, KERN_WARNING, "failed to read SCR %d "
156 "(Emask=0x%x)\n", reg, err_mask);
163 * sata_pmp_scr_write - write PSCR
164 * @link: ATA link to write PSCR for
165 * @reg: PSCR to write
166 * @val: value to be written
168 * Write @val to PSCR @reg for @link, to be called from
169 * ata_scr_write() and ata_scr_write_flush().
172 * Kernel thread context (may sleep).
175 * 0 on success, -errno on failure.
177 int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val)
179 unsigned int err_mask;
181 if (reg > SATA_PMP_PSCR_CONTROL)
184 err_mask = sata_pmp_write(link, reg, val);
186 ata_link_printk(link, KERN_WARNING, "failed to write SCR %d "
187 "(Emask=0x%x)\n", reg, err_mask);
194 * sata_pmp_set_lpm - configure LPM for a PMP link
195 * @link: PMP link to configure LPM for
196 * @policy: target LPM policy
199 * Configure LPM for @link. This function will contain any PMP
200 * specific workarounds if necessary.
206 * 0 on success, -errno on failure.
208 int sata_pmp_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
211 return sata_link_scr_lpm(link, policy, true);
215 * sata_pmp_read_gscr - read GSCR block of SATA PMP
217 * @gscr: buffer to read GSCR block into
219 * Read selected PMP GSCRs from the PMP at @dev. This will serve
220 * as configuration and identification info for the PMP.
223 * Kernel thread context (may sleep).
226 * 0 on success, -errno on failure.
228 static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr)
230 static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 };
233 for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) {
234 int reg = gscr_to_read[i];
235 unsigned int err_mask;
237 err_mask = sata_pmp_read(dev->link, reg, &gscr[reg]);
239 ata_dev_printk(dev, KERN_ERR, "failed to read PMP "
240 "GSCR[%d] (Emask=0x%x)\n", reg, err_mask);
248 static const char *sata_pmp_spec_rev_str(const u32 *gscr)
250 u32 rev = gscr[SATA_PMP_GSCR_REV];
261 #define PMP_GSCR_SII_POL 129
263 static int sata_pmp_configure(struct ata_device *dev, int print_info)
265 struct ata_port *ap = dev->link->ap;
266 u32 *gscr = dev->gscr;
267 u16 vendor = sata_pmp_gscr_vendor(gscr);
268 u16 devid = sata_pmp_gscr_devid(gscr);
269 unsigned int err_mask = 0;
273 nr_ports = sata_pmp_gscr_ports(gscr);
275 if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) {
277 reason = "invalid nr_ports";
281 if ((ap->flags & ATA_FLAG_AN) &&
282 (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY))
283 dev->flags |= ATA_DFLAG_AN;
285 /* monitor SERR_PHYRDY_CHG on fan-out ports */
286 err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN,
290 reason = "failed to write GSCR_ERROR_EN";
294 /* Disable sending Early R_OK.
295 * With "cached read" HDD testing and multiple ports busy on a SATA
296 * host controller, 3726 PMP will very rarely drop a deferred
297 * R_OK that was intended for the host. Symptom will be all
298 * 5 drives under test will timeout, get reset, and recover.
300 if (vendor == 0x1095 && devid == 0x3726) {
303 err_mask = sata_pmp_read(&ap->link, PMP_GSCR_SII_POL, ®);
306 reason = "failed to read Sil3726 Private Register";
310 err_mask = sata_pmp_write(&ap->link, PMP_GSCR_SII_POL, reg);
313 reason = "failed to write Sil3726 Private Register";
319 ata_dev_printk(dev, KERN_INFO, "Port Multiplier %s, "
320 "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n",
321 sata_pmp_spec_rev_str(gscr), vendor, devid,
322 sata_pmp_gscr_rev(gscr),
323 nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN],
324 gscr[SATA_PMP_GSCR_FEAT]);
326 if (!(dev->flags & ATA_DFLAG_AN))
327 ata_dev_printk(dev, KERN_INFO,
328 "Asynchronous notification not supported, "
329 "hotplug won't\n work on fan-out "
330 "ports. Use warm-plug instead.\n");
336 ata_dev_printk(dev, KERN_ERR,
337 "failed to configure Port Multiplier (%s, Emask=0x%x)\n",
342 static int sata_pmp_init_links (struct ata_port *ap, int nr_ports)
344 struct ata_link *pmp_link = ap->pmp_link;
348 pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS,
353 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
354 ata_link_init(ap, &pmp_link[i], i);
356 ap->pmp_link = pmp_link;
358 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) {
359 err = ata_tlink_add(&pmp_link[i]);
366 for (i = 0; i < nr_ports; i++) {
367 struct ata_link *link = &pmp_link[i];
368 struct ata_eh_context *ehc = &link->eh_context;
371 ehc->i.probe_mask |= ATA_ALL_DEVICES;
372 ehc->i.action |= ATA_EH_RESET;
378 ata_tlink_delete(&pmp_link[i]);
384 static void sata_pmp_quirks(struct ata_port *ap)
386 u32 *gscr = ap->link.device->gscr;
387 u16 vendor = sata_pmp_gscr_vendor(gscr);
388 u16 devid = sata_pmp_gscr_devid(gscr);
389 struct ata_link *link;
391 if (vendor == 0x1095 && devid == 0x3726) {
393 ata_for_each_link(link, ap, EDGE) {
394 /* link reports offline after LPM */
395 link->flags |= ATA_LFLAG_NO_LPM;
397 /* Class code report is unreliable and SRST
398 * times out under certain configurations.
401 link->flags |= ATA_LFLAG_NO_SRST |
402 ATA_LFLAG_ASSUME_ATA;
404 /* port 5 is for SEMB device and it doesn't like SRST */
406 link->flags |= ATA_LFLAG_NO_SRST |
407 ATA_LFLAG_ASSUME_SEMB;
409 } else if (vendor == 0x1095 && devid == 0x4723) {
411 ata_for_each_link(link, ap, EDGE) {
412 /* link reports offline after LPM */
413 link->flags |= ATA_LFLAG_NO_LPM;
415 /* class code report is unreliable */
417 link->flags |= ATA_LFLAG_ASSUME_ATA;
419 /* the config device at port 2 locks up on SRST */
421 link->flags |= ATA_LFLAG_NO_SRST |
422 ATA_LFLAG_ASSUME_ATA;
424 } else if (vendor == 0x1095 && devid == 0x4726) {
426 ata_for_each_link(link, ap, EDGE) {
427 /* link reports offline after LPM */
428 link->flags |= ATA_LFLAG_NO_LPM;
430 /* Class code report is unreliable and SRST
431 * times out under certain configurations.
432 * Config device can be at port 0 or 5 and
436 link->flags |= ATA_LFLAG_NO_SRST |
437 ATA_LFLAG_ASSUME_ATA;
439 /* Port 6 is for SEMB device which doesn't
443 link->flags |= ATA_LFLAG_NO_SRST |
444 ATA_LFLAG_ASSUME_SEMB;
446 } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 ||
447 devid == 0x5734 || devid == 0x5744)) {
448 /* sil5723/5744 quirks */
450 /* sil5723/5744 has either two or three downstream
451 * ports depending on operation mode. The last port
452 * is empty if any actual IO device is available or
453 * occupied by a pseudo configuration device
454 * otherwise. Don't try hard to recover it.
456 ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY;
461 * sata_pmp_attach - attach a SATA PMP device
462 * @dev: SATA PMP device to attach
464 * Configure and attach SATA PMP device @dev. This function is
465 * also responsible for allocating and initializing PMP links.
468 * Kernel thread context (may sleep).
471 * 0 on success, -errno on failure.
473 int sata_pmp_attach(struct ata_device *dev)
475 struct ata_link *link = dev->link;
476 struct ata_port *ap = link->ap;
478 struct ata_link *tlink;
481 /* is it hanging off the right place? */
482 if (!sata_pmp_supported(ap)) {
483 ata_dev_printk(dev, KERN_ERR,
484 "host does not support Port Multiplier\n");
488 if (!ata_is_host_link(link)) {
489 ata_dev_printk(dev, KERN_ERR,
490 "Port Multipliers cannot be nested\n");
495 ata_dev_printk(dev, KERN_ERR,
496 "Port Multiplier must be the first device\n");
500 WARN_ON(link->pmp != 0);
501 link->pmp = SATA_PMP_CTRL_PORT;
503 /* read GSCR block */
504 rc = sata_pmp_read_gscr(dev, dev->gscr);
509 rc = sata_pmp_configure(dev, 1);
513 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr));
515 ata_dev_printk(dev, KERN_INFO,
516 "failed to initialize PMP links\n");
521 spin_lock_irqsave(ap->lock, flags);
522 WARN_ON(ap->nr_pmp_links);
523 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr);
524 spin_unlock_irqrestore(ap->lock, flags);
528 if (ap->ops->pmp_attach)
529 ap->ops->pmp_attach(ap);
531 ata_for_each_link(tlink, ap, EDGE)
532 sata_link_init_spd(tlink);
534 ata_acpi_associate_sata_port(ap);
544 * sata_pmp_detach - detach a SATA PMP device
545 * @dev: SATA PMP device to detach
547 * Detach SATA PMP device @dev. This function is also
548 * responsible for deconfiguring PMP links.
551 * Kernel thread context (may sleep).
553 static void sata_pmp_detach(struct ata_device *dev)
555 struct ata_link *link = dev->link;
556 struct ata_port *ap = link->ap;
557 struct ata_link *tlink;
560 ata_dev_printk(dev, KERN_INFO, "Port Multiplier detaching\n");
562 WARN_ON(!ata_is_host_link(link) || dev->devno ||
563 link->pmp != SATA_PMP_CTRL_PORT);
565 if (ap->ops->pmp_detach)
566 ap->ops->pmp_detach(ap);
568 ata_for_each_link(tlink, ap, EDGE)
569 ata_eh_detach_dev(tlink->device);
571 spin_lock_irqsave(ap->lock, flags);
572 ap->nr_pmp_links = 0;
574 spin_unlock_irqrestore(ap->lock, flags);
576 ata_acpi_associate_sata_port(ap);
580 * sata_pmp_same_pmp - does new GSCR matches the configured PMP?
581 * @dev: PMP device to compare against
582 * @new_gscr: GSCR block of the new device
584 * Compare @new_gscr against @dev and determine whether @dev is
585 * the PMP described by @new_gscr.
591 * 1 if @dev matches @new_gscr, 0 otherwise.
593 static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr)
595 const u32 *old_gscr = dev->gscr;
596 u16 old_vendor, new_vendor, old_devid, new_devid;
597 int old_nr_ports, new_nr_ports;
599 old_vendor = sata_pmp_gscr_vendor(old_gscr);
600 new_vendor = sata_pmp_gscr_vendor(new_gscr);
601 old_devid = sata_pmp_gscr_devid(old_gscr);
602 new_devid = sata_pmp_gscr_devid(new_gscr);
603 old_nr_ports = sata_pmp_gscr_ports(old_gscr);
604 new_nr_ports = sata_pmp_gscr_ports(new_gscr);
606 if (old_vendor != new_vendor) {
607 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
608 "vendor mismatch '0x%x' != '0x%x'\n",
609 old_vendor, new_vendor);
613 if (old_devid != new_devid) {
614 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
615 "device ID mismatch '0x%x' != '0x%x'\n",
616 old_devid, new_devid);
620 if (old_nr_ports != new_nr_ports) {
621 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
622 "nr_ports mismatch '0x%x' != '0x%x'\n",
623 old_nr_ports, new_nr_ports);
631 * sata_pmp_revalidate - revalidate SATA PMP
632 * @dev: PMP device to revalidate
633 * @new_class: new class code
635 * Re-read GSCR block and make sure @dev is still attached to the
636 * port and properly configured.
639 * Kernel thread context (may sleep).
642 * 0 on success, -errno otherwise.
644 static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class)
646 struct ata_link *link = dev->link;
647 struct ata_port *ap = link->ap;
648 u32 *gscr = (void *)ap->sector_buf;
653 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE);
655 if (!ata_dev_enabled(dev)) {
661 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) {
667 rc = sata_pmp_read_gscr(dev, gscr);
671 /* is the pmp still there? */
672 if (!sata_pmp_same_pmp(dev, gscr)) {
677 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS);
679 rc = sata_pmp_configure(dev, 0);
683 ata_eh_done(link, NULL, ATA_EH_REVALIDATE);
685 DPRINTK("EXIT, rc=0\n");
689 ata_dev_printk(dev, KERN_ERR,
690 "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);
714 ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID "
715 "(Emask=0x%x)\n", err_mask);
719 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) {
720 ata_dev_printk(dev, KERN_ERR, "PMP product ID mismatch\n");
721 /* something weird is going on, request full PMP recovery */
729 * sata_pmp_eh_recover_pmp - recover PMP
730 * @ap: ATA port PMP is attached to
731 * @prereset: prereset method (can be NULL)
732 * @softreset: softreset method
733 * @hardreset: hardreset method
734 * @postreset: postreset method (can be NULL)
736 * Recover PMP attached to @ap. Recovery procedure is somewhat
737 * similar to that of ata_eh_recover() except that reset should
738 * always be performed in hard->soft sequence and recovery
739 * failure results in PMP detachment.
742 * Kernel thread context (may sleep).
745 * 0 on success, -errno on failure.
747 static int sata_pmp_eh_recover_pmp(struct ata_port *ap,
748 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
749 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
751 struct ata_link *link = &ap->link;
752 struct ata_eh_context *ehc = &link->eh_context;
753 struct ata_device *dev = link->device;
754 int tries = ATA_EH_PMP_TRIES;
755 int detach = 0, rc = 0;
756 int reval_failed = 0;
760 if (dev->flags & ATA_DFLAG_DETACH) {
766 ehc->classes[0] = ATA_DEV_UNKNOWN;
768 if (ehc->i.action & ATA_EH_RESET) {
769 struct ata_link *tlink;
772 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset,
775 ata_link_printk(link, KERN_ERR,
776 "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;
817 ata_dev_printk(dev, KERN_ERR, "failed to recover PMP "
818 "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);
865 ata_link_printk(link, KERN_ERR, "failed to clear "
866 "SError.N (errno=%d)\n", rc);
870 spin_lock_irqsave(ap->lock, flags);
873 spin_unlock_irqrestore(ap->lock, flags);
878 static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries)
880 struct ata_port *ap = link->ap;
883 if (link_tries[link->pmp] && --link_tries[link->pmp])
886 /* disable this link */
887 if (!(link->flags & ATA_LFLAG_DISABLED)) {
888 ata_link_printk(link, KERN_WARNING,
889 "failed to recover link after %d tries, disabling\n",
890 ATA_EH_PMP_LINK_TRIES);
892 spin_lock_irqsave(ap->lock, flags);
893 link->flags |= ATA_LFLAG_DISABLED;
894 spin_unlock_irqrestore(ap->lock, flags);
897 ata_dev_disable(link->device);
898 link->eh_context.i.action = 0;
904 * sata_pmp_eh_recover - recover PMP-enabled port
905 * @ap: ATA port to recover
907 * Drive EH recovery operation for PMP enabled port @ap. This
908 * function recovers host and PMP ports with proper retrials and
909 * fallbacks. Actual recovery operations are performed using
910 * ata_eh_recover() and sata_pmp_eh_recover_pmp().
913 * Kernel thread context (may sleep).
916 * 0 on success, -errno on failure.
918 static int sata_pmp_eh_recover(struct ata_port *ap)
920 struct ata_port_operations *ops = ap->ops;
921 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS];
922 struct ata_link *pmp_link = &ap->link;
923 struct ata_device *pmp_dev = pmp_link->device;
924 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context;
925 u32 *gscr = pmp_dev->gscr;
926 struct ata_link *link;
927 struct ata_device *dev;
928 unsigned int err_mask;
929 u32 gscr_error, sntf;
932 pmp_tries = ATA_EH_PMP_TRIES;
933 ata_for_each_link(link, ap, EDGE)
934 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
938 if (!sata_pmp_attached(ap)) {
939 rc = ata_eh_recover(ap, ops->prereset, ops->softreset,
940 ops->hardreset, ops->postreset, NULL);
942 ata_for_each_dev(dev, &ap->link, ALL)
943 ata_dev_disable(dev);
947 if (pmp_dev->class != ATA_DEV_PMP)
951 ata_for_each_link(link, ap, EDGE)
952 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
958 rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset,
959 ops->hardreset, ops->postreset);
963 if( sata_pmp_is_link_enumeration_allowed() == 0 ) {
964 ata_port_printk(ap, KERN_WARNING, "skipping pmp link enumeration based on kernel configuration");
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_allow_link_enumeration_flag);
1112 EXPORT_SYMBOL_GPL(sata_pmp_port_ops);
1113 EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
1114 EXPORT_SYMBOL_GPL(sata_pmp_error_handler);