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>
15 const struct ata_port_operations sata_pmp_port_ops = {
16 .inherits = &sata_port_ops,
17 .pmp_prereset = ata_std_prereset,
18 .pmp_hardreset = sata_std_hardreset,
19 .pmp_postreset = ata_std_postreset,
20 .error_handler = sata_pmp_error_handler,
24 * sata_pmp_read - read PMP register
25 * @link: link to read PMP register for
26 * @reg: register to read
27 * @r_val: resulting value
32 * Kernel thread context (may sleep).
35 * 0 on success, AC_ERR_* mask on failure.
37 static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val)
39 struct ata_port *ap = link->ap;
40 struct ata_device *pmp_dev = ap->link.device;
41 struct ata_taskfile tf;
42 unsigned int err_mask;
44 ata_tf_init(pmp_dev, &tf);
45 tf.command = ATA_CMD_PMP_READ;
46 tf.protocol = ATA_PROT_NODATA;
47 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
49 tf.device = link->pmp;
51 err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
56 *r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24;
61 * sata_pmp_write - write PMP register
62 * @link: link to write PMP register for
63 * @reg: register to write
64 * @r_val: value to write
69 * Kernel thread context (may sleep).
72 * 0 on success, AC_ERR_* mask on failure.
74 static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val)
76 struct ata_port *ap = link->ap;
77 struct ata_device *pmp_dev = ap->link.device;
78 struct ata_taskfile tf;
80 ata_tf_init(pmp_dev, &tf);
81 tf.command = ATA_CMD_PMP_WRITE;
82 tf.protocol = ATA_PROT_NODATA;
83 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
85 tf.device = link->pmp;
86 tf.nsect = val & 0xff;
87 tf.lbal = (val >> 8) & 0xff;
88 tf.lbam = (val >> 16) & 0xff;
89 tf.lbah = (val >> 24) & 0xff;
91 return ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
96 * sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP
97 * @qc: ATA command in question
99 * A host which has command switching PMP support cannot issue
100 * commands to multiple links simultaneously.
103 * spin_lock_irqsave(host lock)
106 * ATA_DEFER_* if deferring is needed, 0 otherwise.
108 int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc)
110 struct ata_link *link = qc->dev->link;
111 struct ata_port *ap = link->ap;
113 if (ap->excl_link == NULL || ap->excl_link == link) {
114 if (ap->nr_active_links == 0 || ata_link_active(link)) {
115 qc->flags |= ATA_QCFLAG_CLEAR_EXCL;
116 return ata_std_qc_defer(qc);
119 ap->excl_link = link;
122 return ATA_DEFER_PORT;
126 * sata_pmp_scr_read - read PSCR
127 * @link: ATA link to read PSCR for
129 * @r_val: resulting value
131 * Read PSCR @reg into @r_val for @link, to be called from
135 * Kernel thread context (may sleep).
138 * 0 on success, -errno on failure.
140 int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val)
142 unsigned int err_mask;
144 if (reg > SATA_PMP_PSCR_CONTROL)
147 err_mask = sata_pmp_read(link, reg, r_val);
149 ata_link_printk(link, KERN_WARNING, "failed to read SCR %d "
150 "(Emask=0x%x)\n", reg, err_mask);
157 * sata_pmp_scr_write - write PSCR
158 * @link: ATA link to write PSCR for
159 * @reg: PSCR to write
160 * @val: value to be written
162 * Write @val to PSCR @reg for @link, to be called from
163 * ata_scr_write() and ata_scr_write_flush().
166 * Kernel thread context (may sleep).
169 * 0 on success, -errno on failure.
171 int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val)
173 unsigned int err_mask;
175 if (reg > SATA_PMP_PSCR_CONTROL)
178 err_mask = sata_pmp_write(link, reg, val);
180 ata_link_printk(link, KERN_WARNING, "failed to write SCR %d "
181 "(Emask=0x%x)\n", reg, err_mask);
188 * sata_pmp_read_gscr - read GSCR block of SATA PMP
190 * @gscr: buffer to read GSCR block into
192 * Read selected PMP GSCRs from the PMP at @dev. This will serve
193 * as configuration and identification info for the PMP.
196 * Kernel thread context (may sleep).
199 * 0 on success, -errno on failure.
201 static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr)
203 static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 };
206 for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) {
207 int reg = gscr_to_read[i];
208 unsigned int err_mask;
210 err_mask = sata_pmp_read(dev->link, reg, &gscr[reg]);
212 ata_dev_printk(dev, KERN_ERR, "failed to read PMP "
213 "GSCR[%d] (Emask=0x%x)\n", reg, err_mask);
221 static const char *sata_pmp_spec_rev_str(const u32 *gscr)
223 u32 rev = gscr[SATA_PMP_GSCR_REV];
234 #define PMP_GSCR_SII_POL 129
236 static int sata_pmp_configure(struct ata_device *dev, int print_info)
238 struct ata_port *ap = dev->link->ap;
239 u32 *gscr = dev->gscr;
240 u16 vendor = sata_pmp_gscr_vendor(gscr);
241 u16 devid = sata_pmp_gscr_devid(gscr);
242 unsigned int err_mask = 0;
246 nr_ports = sata_pmp_gscr_ports(gscr);
248 if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) {
250 reason = "invalid nr_ports";
254 if ((ap->flags & ATA_FLAG_AN) &&
255 (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY))
256 dev->flags |= ATA_DFLAG_AN;
258 /* monitor SERR_PHYRDY_CHG on fan-out ports */
259 err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN,
263 reason = "failed to write GSCR_ERROR_EN";
267 /* Disable sending Early R_OK.
268 * With "cached read" HDD testing and multiple ports busy on a SATA
269 * host controller, 3726 PMP will very rarely drop a deferred
270 * R_OK that was intended for the host. Symptom will be all
271 * 5 drives under test will timeout, get reset, and recover.
273 if (vendor == 0x1095 && devid == 0x3726) {
276 err_mask = sata_pmp_read(&ap->link, PMP_GSCR_SII_POL, ®);
279 reason = "failed to read Sil3726 Private Register";
283 err_mask = sata_pmp_write(&ap->link, PMP_GSCR_SII_POL, reg);
286 reason = "failed to write Sil3726 Private Register";
292 ata_dev_printk(dev, KERN_INFO, "Port Multiplier %s, "
293 "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n",
294 sata_pmp_spec_rev_str(gscr), vendor, devid,
295 sata_pmp_gscr_rev(gscr),
296 nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN],
297 gscr[SATA_PMP_GSCR_FEAT]);
299 if (!(dev->flags & ATA_DFLAG_AN))
300 ata_dev_printk(dev, KERN_INFO,
301 "Asynchronous notification not supported, "
302 "hotplug won't\n work on fan-out "
303 "ports. Use warm-plug instead.\n");
309 ata_dev_printk(dev, KERN_ERR,
310 "failed to configure Port Multiplier (%s, Emask=0x%x)\n",
315 static int sata_pmp_init_links(struct ata_port *ap, int nr_ports)
317 struct ata_link *pmp_link = ap->pmp_link;
321 pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS,
326 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
327 ata_link_init(ap, &pmp_link[i], i);
329 ap->pmp_link = pmp_link;
332 for (i = 0; i < nr_ports; i++) {
333 struct ata_link *link = &pmp_link[i];
334 struct ata_eh_context *ehc = &link->eh_context;
337 ehc->i.probe_mask |= ATA_ALL_DEVICES;
338 ehc->i.action |= ATA_EH_RESET;
344 static void sata_pmp_quirks(struct ata_port *ap)
346 u32 *gscr = ap->link.device->gscr;
347 u16 vendor = sata_pmp_gscr_vendor(gscr);
348 u16 devid = sata_pmp_gscr_devid(gscr);
349 struct ata_link *link;
351 if (vendor == 0x1095 && devid == 0x3726) {
353 ata_for_each_link(link, ap, EDGE) {
354 /* Class code report is unreliable and SRST
355 * times out under certain configurations.
358 link->flags |= ATA_LFLAG_NO_SRST |
359 ATA_LFLAG_ASSUME_ATA;
361 /* port 5 is for SEMB device and it doesn't like SRST */
363 link->flags |= ATA_LFLAG_NO_SRST |
364 ATA_LFLAG_ASSUME_SEMB;
366 } else if (vendor == 0x1095 && devid == 0x4723) {
368 ata_for_each_link(link, ap, EDGE) {
369 /* class code report is unreliable */
371 link->flags |= ATA_LFLAG_ASSUME_ATA;
373 /* the config device at port 2 locks up on SRST */
375 link->flags |= ATA_LFLAG_NO_SRST |
376 ATA_LFLAG_ASSUME_ATA;
378 } else if (vendor == 0x1095 && devid == 0x4726) {
380 ata_for_each_link(link, ap, EDGE) {
381 /* Class code report is unreliable and SRST
382 * times out under certain configurations.
383 * Config device can be at port 0 or 5 and
387 link->flags |= ATA_LFLAG_NO_SRST |
388 ATA_LFLAG_ASSUME_ATA;
390 /* Port 6 is for SEMB device which doesn't
394 link->flags |= ATA_LFLAG_NO_SRST |
395 ATA_LFLAG_ASSUME_SEMB;
397 } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 ||
398 devid == 0x5734 || devid == 0x5744)) {
399 /* sil5723/5744 quirks */
401 /* sil5723/5744 has either two or three downstream
402 * ports depending on operation mode. The last port
403 * is empty if any actual IO device is available or
404 * occupied by a pseudo configuration device
405 * otherwise. Don't try hard to recover it.
407 ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY;
412 * sata_pmp_attach - attach a SATA PMP device
413 * @dev: SATA PMP device to attach
415 * Configure and attach SATA PMP device @dev. This function is
416 * also responsible for allocating and initializing PMP links.
419 * Kernel thread context (may sleep).
422 * 0 on success, -errno on failure.
424 int sata_pmp_attach(struct ata_device *dev)
426 struct ata_link *link = dev->link;
427 struct ata_port *ap = link->ap;
429 struct ata_link *tlink;
432 /* is it hanging off the right place? */
433 if (!sata_pmp_supported(ap)) {
434 ata_dev_printk(dev, KERN_ERR,
435 "host does not support Port Multiplier\n");
439 if (!ata_is_host_link(link)) {
440 ata_dev_printk(dev, KERN_ERR,
441 "Port Multipliers cannot be nested\n");
446 ata_dev_printk(dev, KERN_ERR,
447 "Port Multiplier must be the first device\n");
451 WARN_ON(link->pmp != 0);
452 link->pmp = SATA_PMP_CTRL_PORT;
454 /* read GSCR block */
455 rc = sata_pmp_read_gscr(dev, dev->gscr);
460 rc = sata_pmp_configure(dev, 1);
464 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr));
466 ata_dev_printk(dev, KERN_INFO,
467 "failed to initialize PMP links\n");
472 spin_lock_irqsave(ap->lock, flags);
473 WARN_ON(ap->nr_pmp_links);
474 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr);
475 spin_unlock_irqrestore(ap->lock, flags);
479 if (ap->ops->pmp_attach)
480 ap->ops->pmp_attach(ap);
482 ata_for_each_link(tlink, ap, EDGE)
483 sata_link_init_spd(tlink);
485 ata_acpi_associate_sata_port(ap);
495 * sata_pmp_detach - detach a SATA PMP device
496 * @dev: SATA PMP device to detach
498 * Detach SATA PMP device @dev. This function is also
499 * responsible for deconfiguring PMP links.
502 * Kernel thread context (may sleep).
504 static void sata_pmp_detach(struct ata_device *dev)
506 struct ata_link *link = dev->link;
507 struct ata_port *ap = link->ap;
508 struct ata_link *tlink;
511 ata_dev_printk(dev, KERN_INFO, "Port Multiplier detaching\n");
513 WARN_ON(!ata_is_host_link(link) || dev->devno ||
514 link->pmp != SATA_PMP_CTRL_PORT);
516 if (ap->ops->pmp_detach)
517 ap->ops->pmp_detach(ap);
519 ata_for_each_link(tlink, ap, EDGE)
520 ata_eh_detach_dev(tlink->device);
522 spin_lock_irqsave(ap->lock, flags);
523 ap->nr_pmp_links = 0;
525 spin_unlock_irqrestore(ap->lock, flags);
527 ata_acpi_associate_sata_port(ap);
531 * sata_pmp_same_pmp - does new GSCR matches the configured PMP?
532 * @dev: PMP device to compare against
533 * @new_gscr: GSCR block of the new device
535 * Compare @new_gscr against @dev and determine whether @dev is
536 * the PMP described by @new_gscr.
542 * 1 if @dev matches @new_gscr, 0 otherwise.
544 static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr)
546 const u32 *old_gscr = dev->gscr;
547 u16 old_vendor, new_vendor, old_devid, new_devid;
548 int old_nr_ports, new_nr_ports;
550 old_vendor = sata_pmp_gscr_vendor(old_gscr);
551 new_vendor = sata_pmp_gscr_vendor(new_gscr);
552 old_devid = sata_pmp_gscr_devid(old_gscr);
553 new_devid = sata_pmp_gscr_devid(new_gscr);
554 old_nr_ports = sata_pmp_gscr_ports(old_gscr);
555 new_nr_ports = sata_pmp_gscr_ports(new_gscr);
557 if (old_vendor != new_vendor) {
558 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
559 "vendor mismatch '0x%x' != '0x%x'\n",
560 old_vendor, new_vendor);
564 if (old_devid != new_devid) {
565 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
566 "device ID mismatch '0x%x' != '0x%x'\n",
567 old_devid, new_devid);
571 if (old_nr_ports != new_nr_ports) {
572 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
573 "nr_ports mismatch '0x%x' != '0x%x'\n",
574 old_nr_ports, new_nr_ports);
582 * sata_pmp_revalidate - revalidate SATA PMP
583 * @dev: PMP device to revalidate
584 * @new_class: new class code
586 * Re-read GSCR block and make sure @dev is still attached to the
587 * port and properly configured.
590 * Kernel thread context (may sleep).
593 * 0 on success, -errno otherwise.
595 static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class)
597 struct ata_link *link = dev->link;
598 struct ata_port *ap = link->ap;
599 u32 *gscr = (void *)ap->sector_buf;
604 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE);
606 if (!ata_dev_enabled(dev)) {
612 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) {
618 rc = sata_pmp_read_gscr(dev, gscr);
622 /* is the pmp still there? */
623 if (!sata_pmp_same_pmp(dev, gscr)) {
628 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS);
630 rc = sata_pmp_configure(dev, 0);
634 ata_eh_done(link, NULL, ATA_EH_REVALIDATE);
636 DPRINTK("EXIT, rc=0\n");
640 ata_dev_printk(dev, KERN_ERR,
641 "PMP revalidation failed (errno=%d)\n", rc);
642 DPRINTK("EXIT, rc=%d\n", rc);
647 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly
648 * @dev: PMP device to revalidate
650 * Make sure the attached PMP is accessible.
653 * Kernel thread context (may sleep).
656 * 0 on success, -errno otherwise.
658 static int sata_pmp_revalidate_quick(struct ata_device *dev)
660 unsigned int err_mask;
663 err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id);
665 ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID "
666 "(Emask=0x%x)\n", err_mask);
670 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) {
671 ata_dev_printk(dev, KERN_ERR, "PMP product ID mismatch\n");
672 /* something weird is going on, request full PMP recovery */
680 * sata_pmp_eh_recover_pmp - recover PMP
681 * @ap: ATA port PMP is attached to
682 * @prereset: prereset method (can be NULL)
683 * @softreset: softreset method
684 * @hardreset: hardreset method
685 * @postreset: postreset method (can be NULL)
687 * Recover PMP attached to @ap. Recovery procedure is somewhat
688 * similar to that of ata_eh_recover() except that reset should
689 * always be performed in hard->soft sequence and recovery
690 * failure results in PMP detachment.
693 * Kernel thread context (may sleep).
696 * 0 on success, -errno on failure.
698 static int sata_pmp_eh_recover_pmp(struct ata_port *ap,
699 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
700 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
702 struct ata_link *link = &ap->link;
703 struct ata_eh_context *ehc = &link->eh_context;
704 struct ata_device *dev = link->device;
705 int tries = ATA_EH_PMP_TRIES;
706 int detach = 0, rc = 0;
707 int reval_failed = 0;
711 if (dev->flags & ATA_DFLAG_DETACH) {
717 ehc->classes[0] = ATA_DEV_UNKNOWN;
719 if (ehc->i.action & ATA_EH_RESET) {
720 struct ata_link *tlink;
723 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset,
726 ata_link_printk(link, KERN_ERR,
727 "failed to reset PMP, giving up\n");
731 /* PMP is reset, SErrors cannot be trusted, scan all */
732 ata_for_each_link(tlink, ap, EDGE) {
733 struct ata_eh_context *ehc = &tlink->eh_context;
735 ehc->i.probe_mask |= ATA_ALL_DEVICES;
736 ehc->i.action |= ATA_EH_RESET;
740 /* If revalidation is requested, revalidate and reconfigure;
741 * otherwise, do quick revalidation.
743 if (ehc->i.action & ATA_EH_REVALIDATE)
744 rc = sata_pmp_revalidate(dev, ehc->classes[0]);
746 rc = sata_pmp_revalidate_quick(dev);
752 ehc->i.probe_mask |= ATA_ALL_DEVICES;
754 /* give it just two more chances */
755 tries = min(tries, 2);
759 /* consecutive revalidation failures? speed down */
761 sata_down_spd_limit(link, 0);
765 ehc->i.action |= ATA_EH_RESET;
768 ata_dev_printk(dev, KERN_ERR, "failed to recover PMP "
769 "after %d tries, giving up\n",
775 /* okay, PMP resurrected */
778 DPRINTK("EXIT, rc=0\n");
782 sata_pmp_detach(dev);
784 ata_eh_detach_dev(dev);
786 ata_dev_disable(dev);
788 DPRINTK("EXIT, rc=%d\n", rc);
792 static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap)
794 struct ata_link *link;
798 spin_lock_irqsave(ap->lock, flags);
800 ata_for_each_link(link, ap, EDGE) {
801 if (!(link->flags & ATA_LFLAG_DISABLED))
804 spin_unlock_irqrestore(ap->lock, flags);
806 /* Some PMPs require hardreset sequence to get
809 sata_link_hardreset(link, sata_deb_timing_normal,
810 ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK),
813 /* unconditionally clear SError.N */
814 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
816 ata_link_printk(link, KERN_ERR, "failed to clear "
817 "SError.N (errno=%d)\n", rc);
821 spin_lock_irqsave(ap->lock, flags);
824 spin_unlock_irqrestore(ap->lock, flags);
829 static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries)
831 struct ata_port *ap = link->ap;
834 if (link_tries[link->pmp] && --link_tries[link->pmp])
837 /* disable this link */
838 if (!(link->flags & ATA_LFLAG_DISABLED)) {
839 ata_link_printk(link, KERN_WARNING,
840 "failed to recover link after %d tries, disabling\n",
841 ATA_EH_PMP_LINK_TRIES);
843 spin_lock_irqsave(ap->lock, flags);
844 link->flags |= ATA_LFLAG_DISABLED;
845 spin_unlock_irqrestore(ap->lock, flags);
848 ata_dev_disable(link->device);
849 link->eh_context.i.action = 0;
855 * sata_pmp_eh_recover - recover PMP-enabled port
856 * @ap: ATA port to recover
858 * Drive EH recovery operation for PMP enabled port @ap. This
859 * function recovers host and PMP ports with proper retrials and
860 * fallbacks. Actual recovery operations are performed using
861 * ata_eh_recover() and sata_pmp_eh_recover_pmp().
864 * Kernel thread context (may sleep).
867 * 0 on success, -errno on failure.
869 static int sata_pmp_eh_recover(struct ata_port *ap)
871 struct ata_port_operations *ops = ap->ops;
872 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS];
873 struct ata_link *pmp_link = &ap->link;
874 struct ata_device *pmp_dev = pmp_link->device;
875 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context;
876 u32 *gscr = pmp_dev->gscr;
877 struct ata_link *link;
878 struct ata_device *dev;
879 unsigned int err_mask;
880 u32 gscr_error, sntf;
883 pmp_tries = ATA_EH_PMP_TRIES;
884 ata_for_each_link(link, ap, EDGE)
885 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
889 if (!sata_pmp_attached(ap)) {
890 rc = ata_eh_recover(ap, ops->prereset, ops->softreset,
891 ops->hardreset, ops->postreset, NULL);
893 ata_for_each_dev(dev, &ap->link, ALL)
894 ata_dev_disable(dev);
898 if (pmp_dev->class != ATA_DEV_PMP)
902 ata_for_each_link(link, ap, EDGE)
903 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
909 rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset,
910 ops->hardreset, ops->postreset);
914 /* PHY event notification can disturb reset and other recovery
915 * operations. Turn it off.
917 if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) {
918 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY;
920 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
921 gscr[SATA_PMP_GSCR_FEAT_EN]);
923 ata_link_printk(pmp_link, KERN_WARNING,
924 "failed to disable NOTIFY (err_mask=0x%x)\n",
930 /* handle disabled links */
931 rc = sata_pmp_eh_handle_disabled_links(ap);
936 rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset,
937 ops->pmp_hardreset, ops->pmp_postreset, &link);
941 /* Connection status might have changed while resetting other
942 * links, check SATA_PMP_GSCR_ERROR before returning.
945 /* clear SNotification */
946 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
948 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
950 /* enable notification */
951 if (pmp_dev->flags & ATA_DFLAG_AN) {
952 gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY;
954 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
955 gscr[SATA_PMP_GSCR_FEAT_EN]);
957 ata_dev_printk(pmp_dev, KERN_ERR, "failed to write "
958 "PMP_FEAT_EN (Emask=0x%x)\n", err_mask);
964 /* check GSCR_ERROR */
965 err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error);
967 ata_dev_printk(pmp_dev, KERN_ERR, "failed to read "
968 "PMP_GSCR_ERROR (Emask=0x%x)\n", err_mask);
974 ata_for_each_link(link, ap, EDGE) {
975 if (!(gscr_error & (1 << link->pmp)))
978 if (sata_pmp_handle_link_fail(link, link_tries)) {
979 ata_ehi_hotplugged(&link->eh_context.i);
982 ata_link_printk(link, KERN_WARNING,
983 "PHY status changed but maxed out on retries, "
985 ata_link_printk(link, KERN_WARNING,
986 "Manully issue scan to resume this link\n");
991 ata_port_printk(ap, KERN_INFO, "PMP SError.N set for some "
992 "ports, repeating recovery\n");
999 if (sata_pmp_handle_link_fail(link, link_tries)) {
1000 pmp_ehc->i.action |= ATA_EH_RESET;
1006 /* Control always ends up here after detaching PMP. Shut up
1007 * and return if we're unloading.
1009 if (ap->pflags & ATA_PFLAG_UNLOADING)
1012 if (!sata_pmp_attached(ap))
1016 pmp_ehc->i.action |= ATA_EH_RESET;
1020 ata_port_printk(ap, KERN_ERR,
1021 "failed to recover PMP after %d tries, giving up\n",
1023 sata_pmp_detach(pmp_dev);
1024 ata_dev_disable(pmp_dev);
1030 * sata_pmp_error_handler - do standard error handling for PMP-enabled host
1031 * @ap: host port to handle error for
1033 * Perform standard error handling sequence for PMP-enabled host
1037 * Kernel thread context (may sleep).
1039 void sata_pmp_error_handler(struct ata_port *ap)
1043 sata_pmp_eh_recover(ap);
1047 EXPORT_SYMBOL_GPL(sata_pmp_port_ops);
1048 EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
1049 EXPORT_SYMBOL_GPL(sata_pmp_error_handler);