Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / drivers / ata / libata-pmp.c
blob21b80c555c607768912953c1f355bf25615c8a22
1 /*
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.
8 */
10 #include <linux/kernel.h>
11 #include <linux/export.h>
12 #include <linux/libata.h>
13 #include <linux/slab.h>
14 #include "libata.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,
25 /**
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
31 * Read PMP register.
33 * LOCKING:
34 * Kernel thread context (may sleep).
36 * RETURNS:
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;
50 tf.feature = reg;
51 tf.device = link->pmp;
53 err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
54 SATA_PMP_RW_TIMEOUT);
55 if (err_mask)
56 return err_mask;
58 *r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24;
59 return 0;
62 /**
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
68 * Write PMP register.
70 * LOCKING:
71 * Kernel thread context (may sleep).
73 * RETURNS:
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;
86 tf.feature = reg;
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,
94 SATA_PMP_RW_TIMEOUT);
97 /**
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.
104 * LOCKING:
105 * spin_lock_irqsave(host lock)
107 * RETURNS:
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
130 * @reg: PSCR to read
131 * @r_val: resulting value
133 * Read PSCR @reg into @r_val for @link, to be called from
134 * ata_scr_read().
136 * LOCKING:
137 * Kernel thread context (may sleep).
139 * RETURNS:
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)
147 return -EINVAL;
149 err_mask = sata_pmp_read(link, reg, r_val);
150 if (err_mask) {
151 ata_link_warn(link, "failed to read SCR %d (Emask=0x%x)\n",
152 reg, err_mask);
153 return -EIO;
155 return 0;
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().
167 * LOCKING:
168 * Kernel thread context (may sleep).
170 * RETURNS:
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)
178 return -EINVAL;
180 err_mask = sata_pmp_write(link, reg, val);
181 if (err_mask) {
182 ata_link_warn(link, "failed to write SCR %d (Emask=0x%x)\n",
183 reg, err_mask);
184 return -EIO;
186 return 0;
190 * sata_pmp_set_lpm - configure LPM for a PMP link
191 * @link: PMP link to configure LPM for
192 * @policy: target LPM policy
193 * @hints: LPM hints
195 * Configure LPM for @link. This function will contain any PMP
196 * specific workarounds if necessary.
198 * LOCKING:
199 * EH context.
201 * RETURNS:
202 * 0 on success, -errno on failure.
204 int sata_pmp_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
205 unsigned hints)
207 return sata_link_scr_lpm(link, policy, true);
211 * sata_pmp_read_gscr - read GSCR block of SATA PMP
212 * @dev: PMP device
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.
218 * LOCKING:
219 * Kernel thread context (may sleep).
221 * RETURNS:
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 };
227 int i;
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]);
234 if (err_mask) {
235 ata_dev_err(dev, "failed to read PMP GSCR[%d] (Emask=0x%x)\n",
236 reg, err_mask);
237 return -EIO;
241 return 0;
244 static const char *sata_pmp_spec_rev_str(const u32 *gscr)
246 u32 rev = gscr[SATA_PMP_GSCR_REV];
248 if (rev & (1 << 3))
249 return "1.2";
250 if (rev & (1 << 2))
251 return "1.1";
252 if (rev & (1 << 1))
253 return "1.0";
254 return "<unknown>";
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;
266 const char *reason;
267 int nr_ports, rc;
269 nr_ports = sata_pmp_gscr_ports(gscr);
271 if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) {
272 rc = -EINVAL;
273 reason = "invalid nr_ports";
274 goto fail;
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,
283 SERR_PHYRDY_CHG);
284 if (err_mask) {
285 rc = -EIO;
286 reason = "failed to write GSCR_ERROR_EN";
287 goto fail;
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) {
297 u32 reg;
299 err_mask = sata_pmp_read(&ap->link, PMP_GSCR_SII_POL, &reg);
300 if (err_mask) {
301 rc = -EIO;
302 reason = "failed to read Sil3726 Private Register";
303 goto fail;
305 reg &= ~0x1;
306 err_mask = sata_pmp_write(&ap->link, PMP_GSCR_SII_POL, reg);
307 if (err_mask) {
308 rc = -EIO;
309 reason = "failed to write Sil3726 Private Register";
310 goto fail;
314 if (print_info) {
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))
323 ata_dev_info(dev,
324 "Asynchronous notification not supported, "
325 "hotplug won't work on fan-out ports. Use warm-plug instead.\n");
328 return 0;
330 fail:
331 ata_dev_err(dev,
332 "failed to configure Port Multiplier (%s, Emask=0x%x)\n",
333 reason, err_mask);
334 return rc;
337 static int sata_pmp_init_links (struct ata_port *ap, int nr_ports)
339 struct ata_link *pmp_link = ap->pmp_link;
340 int i, err;
342 if (!pmp_link) {
343 pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS,
344 GFP_NOIO);
345 if (!pmp_link)
346 return -ENOMEM;
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]);
355 if (err) {
356 goto err_tlink;
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;
365 link->flags = 0;
366 ehc->i.probe_mask |= ATA_ALL_DEVICES;
367 ehc->i.action |= ATA_EH_RESET;
370 return 0;
371 err_tlink:
372 while (--i >= 0)
373 ata_tlink_delete(&pmp_link[i]);
374 kfree(pmp_link);
375 ap->pmp_link = NULL;
376 return err;
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) {
387 /* sil3726 quirks */
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. */
393 if (link->pmp < 5)
394 link->flags |= ATA_LFLAG_ASSUME_ATA;
396 /* port 5 is for SEMB device and it doesn't like SRST */
397 if (link->pmp == 5)
398 link->flags |= ATA_LFLAG_NO_SRST |
399 ATA_LFLAG_ASSUME_SEMB;
401 } else if (vendor == 0x1095 && devid == 0x4723) {
402 /* sil4723 quirks */
403 ata_for_each_link(link, ap, EDGE) {
404 /* link reports offline after LPM */
405 link->flags |= ATA_LFLAG_NO_LPM;
407 /* class code report is unreliable */
408 if (link->pmp < 2)
409 link->flags |= ATA_LFLAG_ASSUME_ATA;
411 /* the config device at port 2 locks up on SRST */
412 if (link->pmp == 2)
413 link->flags |= ATA_LFLAG_NO_SRST |
414 ATA_LFLAG_ASSUME_ATA;
416 } else if (vendor == 0x1095 && devid == 0x4726) {
417 /* sil4726 quirks */
418 ata_for_each_link(link, ap, EDGE) {
419 /* link reports offline after LPM */
420 link->flags |= ATA_LFLAG_NO_LPM;
422 /* Class code report is unreliable and SRST
423 * times out under certain configurations.
424 * Config device can be at port 0 or 5 and
425 * locks up on SRST.
427 if (link->pmp <= 5)
428 link->flags |= ATA_LFLAG_NO_SRST |
429 ATA_LFLAG_ASSUME_ATA;
431 /* Port 6 is for SEMB device which doesn't
432 * like SRST either.
434 if (link->pmp == 6)
435 link->flags |= ATA_LFLAG_NO_SRST |
436 ATA_LFLAG_ASSUME_SEMB;
438 } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 ||
439 devid == 0x5734 || devid == 0x5744)) {
440 /* sil5723/5744 quirks */
442 /* sil5723/5744 has either two or three downstream
443 * ports depending on operation mode. The last port
444 * is empty if any actual IO device is available or
445 * occupied by a pseudo configuration device
446 * otherwise. Don't try hard to recover it.
448 ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY;
449 } else if (vendor == 0x197b && devid == 0x2352) {
450 /* chip found in Thermaltake BlackX Duet, jmicron JMB350? */
451 ata_for_each_link(link, ap, EDGE) {
452 /* SRST breaks detection and disks get misclassified
453 * LPM disabled to avoid potential problems
455 link->flags |= ATA_LFLAG_NO_LPM |
456 ATA_LFLAG_NO_SRST |
457 ATA_LFLAG_ASSUME_ATA;
463 * sata_pmp_attach - attach a SATA PMP device
464 * @dev: SATA PMP device to attach
466 * Configure and attach SATA PMP device @dev. This function is
467 * also responsible for allocating and initializing PMP links.
469 * LOCKING:
470 * Kernel thread context (may sleep).
472 * RETURNS:
473 * 0 on success, -errno on failure.
475 int sata_pmp_attach(struct ata_device *dev)
477 struct ata_link *link = dev->link;
478 struct ata_port *ap = link->ap;
479 unsigned long flags;
480 struct ata_link *tlink;
481 int rc;
483 /* is it hanging off the right place? */
484 if (!sata_pmp_supported(ap)) {
485 ata_dev_err(dev, "host does not support Port Multiplier\n");
486 return -EINVAL;
489 if (!ata_is_host_link(link)) {
490 ata_dev_err(dev, "Port Multipliers cannot be nested\n");
491 return -EINVAL;
494 if (dev->devno) {
495 ata_dev_err(dev, "Port Multiplier must be the first device\n");
496 return -EINVAL;
499 WARN_ON(link->pmp != 0);
500 link->pmp = SATA_PMP_CTRL_PORT;
502 /* read GSCR block */
503 rc = sata_pmp_read_gscr(dev, dev->gscr);
504 if (rc)
505 goto fail;
507 /* config PMP */
508 rc = sata_pmp_configure(dev, 1);
509 if (rc)
510 goto fail;
512 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr));
513 if (rc) {
514 ata_dev_info(dev, "failed to initialize PMP links\n");
515 goto fail;
518 /* attach it */
519 spin_lock_irqsave(ap->lock, flags);
520 WARN_ON(ap->nr_pmp_links);
521 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr);
522 spin_unlock_irqrestore(ap->lock, flags);
524 sata_pmp_quirks(ap);
526 if (ap->ops->pmp_attach)
527 ap->ops->pmp_attach(ap);
529 ata_for_each_link(tlink, ap, EDGE)
530 sata_link_init_spd(tlink);
532 ata_acpi_associate_sata_port(ap);
534 return 0;
536 fail:
537 link->pmp = 0;
538 return rc;
542 * sata_pmp_detach - detach a SATA PMP device
543 * @dev: SATA PMP device to detach
545 * Detach SATA PMP device @dev. This function is also
546 * responsible for deconfiguring PMP links.
548 * LOCKING:
549 * Kernel thread context (may sleep).
551 static void sata_pmp_detach(struct ata_device *dev)
553 struct ata_link *link = dev->link;
554 struct ata_port *ap = link->ap;
555 struct ata_link *tlink;
556 unsigned long flags;
558 ata_dev_info(dev, "Port Multiplier detaching\n");
560 WARN_ON(!ata_is_host_link(link) || dev->devno ||
561 link->pmp != SATA_PMP_CTRL_PORT);
563 if (ap->ops->pmp_detach)
564 ap->ops->pmp_detach(ap);
566 ata_for_each_link(tlink, ap, EDGE)
567 ata_eh_detach_dev(tlink->device);
569 spin_lock_irqsave(ap->lock, flags);
570 ap->nr_pmp_links = 0;
571 link->pmp = 0;
572 spin_unlock_irqrestore(ap->lock, flags);
574 ata_acpi_associate_sata_port(ap);
578 * sata_pmp_same_pmp - does new GSCR matches the configured PMP?
579 * @dev: PMP device to compare against
580 * @new_gscr: GSCR block of the new device
582 * Compare @new_gscr against @dev and determine whether @dev is
583 * the PMP described by @new_gscr.
585 * LOCKING:
586 * None.
588 * RETURNS:
589 * 1 if @dev matches @new_gscr, 0 otherwise.
591 static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr)
593 const u32 *old_gscr = dev->gscr;
594 u16 old_vendor, new_vendor, old_devid, new_devid;
595 int old_nr_ports, new_nr_ports;
597 old_vendor = sata_pmp_gscr_vendor(old_gscr);
598 new_vendor = sata_pmp_gscr_vendor(new_gscr);
599 old_devid = sata_pmp_gscr_devid(old_gscr);
600 new_devid = sata_pmp_gscr_devid(new_gscr);
601 old_nr_ports = sata_pmp_gscr_ports(old_gscr);
602 new_nr_ports = sata_pmp_gscr_ports(new_gscr);
604 if (old_vendor != new_vendor) {
605 ata_dev_info(dev,
606 "Port Multiplier vendor mismatch '0x%x' != '0x%x'\n",
607 old_vendor, new_vendor);
608 return 0;
611 if (old_devid != new_devid) {
612 ata_dev_info(dev,
613 "Port Multiplier device ID mismatch '0x%x' != '0x%x'\n",
614 old_devid, new_devid);
615 return 0;
618 if (old_nr_ports != new_nr_ports) {
619 ata_dev_info(dev,
620 "Port Multiplier nr_ports mismatch '0x%x' != '0x%x'\n",
621 old_nr_ports, new_nr_ports);
622 return 0;
625 return 1;
629 * sata_pmp_revalidate - revalidate SATA PMP
630 * @dev: PMP device to revalidate
631 * @new_class: new class code
633 * Re-read GSCR block and make sure @dev is still attached to the
634 * port and properly configured.
636 * LOCKING:
637 * Kernel thread context (may sleep).
639 * RETURNS:
640 * 0 on success, -errno otherwise.
642 static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class)
644 struct ata_link *link = dev->link;
645 struct ata_port *ap = link->ap;
646 u32 *gscr = (void *)ap->sector_buf;
647 int rc;
649 DPRINTK("ENTER\n");
651 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE);
653 if (!ata_dev_enabled(dev)) {
654 rc = -ENODEV;
655 goto fail;
658 /* wrong class? */
659 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) {
660 rc = -ENODEV;
661 goto fail;
664 /* read GSCR */
665 rc = sata_pmp_read_gscr(dev, gscr);
666 if (rc)
667 goto fail;
669 /* is the pmp still there? */
670 if (!sata_pmp_same_pmp(dev, gscr)) {
671 rc = -ENODEV;
672 goto fail;
675 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS);
677 rc = sata_pmp_configure(dev, 0);
678 if (rc)
679 goto fail;
681 ata_eh_done(link, NULL, ATA_EH_REVALIDATE);
683 DPRINTK("EXIT, rc=0\n");
684 return 0;
686 fail:
687 ata_dev_err(dev, "PMP revalidation failed (errno=%d)\n", rc);
688 DPRINTK("EXIT, rc=%d\n", rc);
689 return rc;
693 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly
694 * @dev: PMP device to revalidate
696 * Make sure the attached PMP is accessible.
698 * LOCKING:
699 * Kernel thread context (may sleep).
701 * RETURNS:
702 * 0 on success, -errno otherwise.
704 static int sata_pmp_revalidate_quick(struct ata_device *dev)
706 unsigned int err_mask;
707 u32 prod_id;
709 err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id);
710 if (err_mask) {
711 ata_dev_err(dev,
712 "failed to read PMP product ID (Emask=0x%x)\n",
713 err_mask);
714 return -EIO;
717 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) {
718 ata_dev_err(dev, "PMP product ID mismatch\n");
719 /* something weird is going on, request full PMP recovery */
720 return -EIO;
723 return 0;
727 * sata_pmp_eh_recover_pmp - recover PMP
728 * @ap: ATA port PMP is attached to
729 * @prereset: prereset method (can be NULL)
730 * @softreset: softreset method
731 * @hardreset: hardreset method
732 * @postreset: postreset method (can be NULL)
734 * Recover PMP attached to @ap. Recovery procedure is somewhat
735 * similar to that of ata_eh_recover() except that reset should
736 * always be performed in hard->soft sequence and recovery
737 * failure results in PMP detachment.
739 * LOCKING:
740 * Kernel thread context (may sleep).
742 * RETURNS:
743 * 0 on success, -errno on failure.
745 static int sata_pmp_eh_recover_pmp(struct ata_port *ap,
746 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
747 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
749 struct ata_link *link = &ap->link;
750 struct ata_eh_context *ehc = &link->eh_context;
751 struct ata_device *dev = link->device;
752 int tries = ATA_EH_PMP_TRIES;
753 int detach = 0, rc = 0;
754 int reval_failed = 0;
756 DPRINTK("ENTER\n");
758 if (dev->flags & ATA_DFLAG_DETACH) {
759 detach = 1;
760 goto fail;
763 retry:
764 ehc->classes[0] = ATA_DEV_UNKNOWN;
766 if (ehc->i.action & ATA_EH_RESET) {
767 struct ata_link *tlink;
769 /* reset */
770 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset,
771 postreset);
772 if (rc) {
773 ata_link_err(link, "failed to reset PMP, giving up\n");
774 goto fail;
777 /* PMP is reset, SErrors cannot be trusted, scan all */
778 ata_for_each_link(tlink, ap, EDGE) {
779 struct ata_eh_context *ehc = &tlink->eh_context;
781 ehc->i.probe_mask |= ATA_ALL_DEVICES;
782 ehc->i.action |= ATA_EH_RESET;
786 /* If revalidation is requested, revalidate and reconfigure;
787 * otherwise, do quick revalidation.
789 if (ehc->i.action & ATA_EH_REVALIDATE)
790 rc = sata_pmp_revalidate(dev, ehc->classes[0]);
791 else
792 rc = sata_pmp_revalidate_quick(dev);
794 if (rc) {
795 tries--;
797 if (rc == -ENODEV) {
798 ehc->i.probe_mask |= ATA_ALL_DEVICES;
799 detach = 1;
800 /* give it just two more chances */
801 tries = min(tries, 2);
804 if (tries) {
805 /* consecutive revalidation failures? speed down */
806 if (reval_failed)
807 sata_down_spd_limit(link, 0);
808 else
809 reval_failed = 1;
811 ehc->i.action |= ATA_EH_RESET;
812 goto retry;
813 } else {
814 ata_dev_err(dev,
815 "failed to recover PMP after %d tries, giving up\n",
816 ATA_EH_PMP_TRIES);
817 goto fail;
821 /* okay, PMP resurrected */
822 ehc->i.flags = 0;
824 DPRINTK("EXIT, rc=0\n");
825 return 0;
827 fail:
828 sata_pmp_detach(dev);
829 if (detach)
830 ata_eh_detach_dev(dev);
831 else
832 ata_dev_disable(dev);
834 DPRINTK("EXIT, rc=%d\n", rc);
835 return rc;
838 static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap)
840 struct ata_link *link;
841 unsigned long flags;
842 int rc;
844 spin_lock_irqsave(ap->lock, flags);
846 ata_for_each_link(link, ap, EDGE) {
847 if (!(link->flags & ATA_LFLAG_DISABLED))
848 continue;
850 spin_unlock_irqrestore(ap->lock, flags);
852 /* Some PMPs require hardreset sequence to get
853 * SError.N working.
855 sata_link_hardreset(link, sata_deb_timing_normal,
856 ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK),
857 NULL, NULL);
859 /* unconditionally clear SError.N */
860 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
861 if (rc) {
862 ata_link_err(link,
863 "failed to clear SError.N (errno=%d)\n",
864 rc);
865 return rc;
868 spin_lock_irqsave(ap->lock, flags);
871 spin_unlock_irqrestore(ap->lock, flags);
873 return 0;
876 static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries)
878 struct ata_port *ap = link->ap;
879 unsigned long flags;
881 if (link_tries[link->pmp] && --link_tries[link->pmp])
882 return 1;
884 /* disable this link */
885 if (!(link->flags & ATA_LFLAG_DISABLED)) {
886 ata_link_warn(link,
887 "failed to recover link after %d tries, disabling\n",
888 ATA_EH_PMP_LINK_TRIES);
890 spin_lock_irqsave(ap->lock, flags);
891 link->flags |= ATA_LFLAG_DISABLED;
892 spin_unlock_irqrestore(ap->lock, flags);
895 ata_dev_disable(link->device);
896 link->eh_context.i.action = 0;
898 return 0;
902 * sata_pmp_eh_recover - recover PMP-enabled port
903 * @ap: ATA port to recover
905 * Drive EH recovery operation for PMP enabled port @ap. This
906 * function recovers host and PMP ports with proper retrials and
907 * fallbacks. Actual recovery operations are performed using
908 * ata_eh_recover() and sata_pmp_eh_recover_pmp().
910 * LOCKING:
911 * Kernel thread context (may sleep).
913 * RETURNS:
914 * 0 on success, -errno on failure.
916 static int sata_pmp_eh_recover(struct ata_port *ap)
918 struct ata_port_operations *ops = ap->ops;
919 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS];
920 struct ata_link *pmp_link = &ap->link;
921 struct ata_device *pmp_dev = pmp_link->device;
922 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context;
923 u32 *gscr = pmp_dev->gscr;
924 struct ata_link *link;
925 struct ata_device *dev;
926 unsigned int err_mask;
927 u32 gscr_error, sntf;
928 int cnt, rc;
930 pmp_tries = ATA_EH_PMP_TRIES;
931 ata_for_each_link(link, ap, EDGE)
932 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
934 retry:
935 /* PMP attached? */
936 if (!sata_pmp_attached(ap)) {
937 rc = ata_eh_recover(ap, ops->prereset, ops->softreset,
938 ops->hardreset, ops->postreset, NULL);
939 if (rc) {
940 ata_for_each_dev(dev, &ap->link, ALL)
941 ata_dev_disable(dev);
942 return rc;
945 if (pmp_dev->class != ATA_DEV_PMP)
946 return 0;
948 /* new PMP online */
949 ata_for_each_link(link, ap, EDGE)
950 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
952 /* fall through */
955 /* recover pmp */
956 rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset,
957 ops->hardreset, ops->postreset);
958 if (rc)
959 goto pmp_fail;
961 /* PHY event notification can disturb reset and other recovery
962 * operations. Turn it off.
964 if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) {
965 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY;
967 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
968 gscr[SATA_PMP_GSCR_FEAT_EN]);
969 if (err_mask) {
970 ata_link_warn(pmp_link,
971 "failed to disable NOTIFY (err_mask=0x%x)\n",
972 err_mask);
973 goto pmp_fail;
977 /* handle disabled links */
978 rc = sata_pmp_eh_handle_disabled_links(ap);
979 if (rc)
980 goto pmp_fail;
982 /* recover links */
983 rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset,
984 ops->pmp_hardreset, ops->pmp_postreset, &link);
985 if (rc)
986 goto link_fail;
988 /* clear SNotification */
989 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
990 if (rc == 0)
991 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
994 * If LPM is active on any fan-out port, hotplug wouldn't
995 * work. Return w/ PHY event notification disabled.
997 ata_for_each_link(link, ap, EDGE)
998 if (link->lpm_policy > ATA_LPM_MAX_POWER)
999 return 0;
1002 * Connection status might have changed while resetting other
1003 * links, enable notification and check SATA_PMP_GSCR_ERROR
1004 * before returning.
1007 /* enable notification */
1008 if (pmp_dev->flags & ATA_DFLAG_AN) {
1009 gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY;
1011 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
1012 gscr[SATA_PMP_GSCR_FEAT_EN]);
1013 if (err_mask) {
1014 ata_dev_err(pmp_dev,
1015 "failed to write PMP_FEAT_EN (Emask=0x%x)\n",
1016 err_mask);
1017 rc = -EIO;
1018 goto pmp_fail;
1022 /* check GSCR_ERROR */
1023 err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error);
1024 if (err_mask) {
1025 ata_dev_err(pmp_dev,
1026 "failed to read PMP_GSCR_ERROR (Emask=0x%x)\n",
1027 err_mask);
1028 rc = -EIO;
1029 goto pmp_fail;
1032 cnt = 0;
1033 ata_for_each_link(link, ap, EDGE) {
1034 if (!(gscr_error & (1 << link->pmp)))
1035 continue;
1037 if (sata_pmp_handle_link_fail(link, link_tries)) {
1038 ata_ehi_hotplugged(&link->eh_context.i);
1039 cnt++;
1040 } else {
1041 ata_link_warn(link,
1042 "PHY status changed but maxed out on retries, giving up\n");
1043 ata_link_warn(link,
1044 "Manually issue scan to resume this link\n");
1048 if (cnt) {
1049 ata_port_info(ap,
1050 "PMP SError.N set for some ports, repeating recovery\n");
1051 goto retry;
1054 return 0;
1056 link_fail:
1057 if (sata_pmp_handle_link_fail(link, link_tries)) {
1058 pmp_ehc->i.action |= ATA_EH_RESET;
1059 goto retry;
1062 /* fall through */
1063 pmp_fail:
1064 /* Control always ends up here after detaching PMP. Shut up
1065 * and return if we're unloading.
1067 if (ap->pflags & ATA_PFLAG_UNLOADING)
1068 return rc;
1070 if (!sata_pmp_attached(ap))
1071 goto retry;
1073 if (--pmp_tries) {
1074 pmp_ehc->i.action |= ATA_EH_RESET;
1075 goto retry;
1078 ata_port_err(ap, "failed to recover PMP after %d tries, giving up\n",
1079 ATA_EH_PMP_TRIES);
1080 sata_pmp_detach(pmp_dev);
1081 ata_dev_disable(pmp_dev);
1083 return rc;
1087 * sata_pmp_error_handler - do standard error handling for PMP-enabled host
1088 * @ap: host port to handle error for
1090 * Perform standard error handling sequence for PMP-enabled host
1091 * @ap.
1093 * LOCKING:
1094 * Kernel thread context (may sleep).
1096 void sata_pmp_error_handler(struct ata_port *ap)
1098 ata_eh_autopsy(ap);
1099 ata_eh_report(ap);
1100 sata_pmp_eh_recover(ap);
1101 ata_eh_finish(ap);
1104 EXPORT_SYMBOL_GPL(sata_pmp_port_ops);
1105 EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
1106 EXPORT_SYMBOL_GPL(sata_pmp_error_handler);