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-rw-r--r--drivers/ata/libata-pmp.c1191
1 files changed, 1191 insertions, 0 deletions
diff --git a/drivers/ata/libata-pmp.c b/drivers/ata/libata-pmp.c
new file mode 100644
index 000000000000..c0c4dbcde091
--- /dev/null
+++ b/drivers/ata/libata-pmp.c
@@ -0,0 +1,1191 @@
1/*
2 * libata-pmp.c - libata port multiplier support
3 *
4 * Copyright (c) 2007 SUSE Linux Products GmbH
5 * Copyright (c) 2007 Tejun Heo <teheo@suse.de>
6 *
7 * This file is released under the GPLv2.
8 */
9
10#include <linux/kernel.h>
11#include <linux/libata.h>
12#include "libata.h"
13
14/**
15 * sata_pmp_read - read PMP register
16 * @link: link to read PMP register for
17 * @reg: register to read
18 * @r_val: resulting value
19 *
20 * Read PMP register.
21 *
22 * LOCKING:
23 * Kernel thread context (may sleep).
24 *
25 * RETURNS:
26 * 0 on success, AC_ERR_* mask on failure.
27 */
28static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val)
29{
30 struct ata_port *ap = link->ap;
31 struct ata_device *pmp_dev = ap->link.device;
32 struct ata_taskfile tf;
33 unsigned int err_mask;
34
35 ata_tf_init(pmp_dev, &tf);
36 tf.command = ATA_CMD_PMP_READ;
37 tf.protocol = ATA_PROT_NODATA;
38 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
39 tf.feature = reg;
40 tf.device = link->pmp;
41
42 err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
43 SATA_PMP_SCR_TIMEOUT);
44 if (err_mask)
45 return err_mask;
46
47 *r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24;
48 return 0;
49}
50
51/**
52 * sata_pmp_write - write PMP register
53 * @link: link to write PMP register for
54 * @reg: register to write
55 * @r_val: value to write
56 *
57 * Write PMP register.
58 *
59 * LOCKING:
60 * Kernel thread context (may sleep).
61 *
62 * RETURNS:
63 * 0 on success, AC_ERR_* mask on failure.
64 */
65static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val)
66{
67 struct ata_port *ap = link->ap;
68 struct ata_device *pmp_dev = ap->link.device;
69 struct ata_taskfile tf;
70
71 ata_tf_init(pmp_dev, &tf);
72 tf.command = ATA_CMD_PMP_WRITE;
73 tf.protocol = ATA_PROT_NODATA;
74 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
75 tf.feature = reg;
76 tf.device = link->pmp;
77 tf.nsect = val & 0xff;
78 tf.lbal = (val >> 8) & 0xff;
79 tf.lbam = (val >> 16) & 0xff;
80 tf.lbah = (val >> 24) & 0xff;
81
82 return ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
83 SATA_PMP_SCR_TIMEOUT);
84}
85
86/**
87 * sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP
88 * @qc: ATA command in question
89 *
90 * A host which has command switching PMP support cannot issue
91 * commands to multiple links simultaneously.
92 *
93 * LOCKING:
94 * spin_lock_irqsave(host lock)
95 *
96 * RETURNS:
97 * ATA_DEFER_* if deferring is needed, 0 otherwise.
98 */
99int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc)
100{
101 struct ata_link *link = qc->dev->link;
102 struct ata_port *ap = link->ap;
103
104 if (ap->excl_link == NULL || ap->excl_link == link) {
105 if (ap->nr_active_links == 0 || ata_link_active(link)) {
106 qc->flags |= ATA_QCFLAG_CLEAR_EXCL;
107 return ata_std_qc_defer(qc);
108 }
109
110 ap->excl_link = link;
111 }
112
113 return ATA_DEFER_PORT;
114}
115
116/**
117 * sata_pmp_scr_read - read PSCR
118 * @link: ATA link to read PSCR for
119 * @reg: PSCR to read
120 * @r_val: resulting value
121 *
122 * Read PSCR @reg into @r_val for @link, to be called from
123 * ata_scr_read().
124 *
125 * LOCKING:
126 * Kernel thread context (may sleep).
127 *
128 * RETURNS:
129 * 0 on success, -errno on failure.
130 */
131int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val)
132{
133 unsigned int err_mask;
134
135 if (reg > SATA_PMP_PSCR_CONTROL)
136 return -EINVAL;
137
138 err_mask = sata_pmp_read(link, reg, r_val);
139 if (err_mask) {
140 ata_link_printk(link, KERN_WARNING, "failed to read SCR %d "
141 "(Emask=0x%x)\n", reg, err_mask);
142 return -EIO;
143 }
144 return 0;
145}
146
147/**
148 * sata_pmp_scr_write - write PSCR
149 * @link: ATA link to write PSCR for
150 * @reg: PSCR to write
151 * @val: value to be written
152 *
153 * Write @val to PSCR @reg for @link, to be called from
154 * ata_scr_write() and ata_scr_write_flush().
155 *
156 * LOCKING:
157 * Kernel thread context (may sleep).
158 *
159 * RETURNS:
160 * 0 on success, -errno on failure.
161 */
162int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val)
163{
164 unsigned int err_mask;
165
166 if (reg > SATA_PMP_PSCR_CONTROL)
167 return -EINVAL;
168
169 err_mask = sata_pmp_write(link, reg, val);
170 if (err_mask) {
171 ata_link_printk(link, KERN_WARNING, "failed to write SCR %d "
172 "(Emask=0x%x)\n", reg, err_mask);
173 return -EIO;
174 }
175 return 0;
176}
177
178/**
179 * sata_pmp_std_prereset - prepare PMP link for reset
180 * @link: link to be reset
181 * @deadline: deadline jiffies for the operation
182 *
183 * @link is about to be reset. Initialize it.
184 *
185 * LOCKING:
186 * Kernel thread context (may sleep)
187 *
188 * RETURNS:
189 * 0 on success, -errno otherwise.
190 */
191int sata_pmp_std_prereset(struct ata_link *link, unsigned long deadline)
192{
193 struct ata_eh_context *ehc = &link->eh_context;
194 const unsigned long *timing = sata_ehc_deb_timing(ehc);
195 int rc;
196
197 /* force HRST? */
198 if (link->flags & ATA_LFLAG_NO_SRST)
199 ehc->i.action |= ATA_EH_HARDRESET;
200
201 /* handle link resume */
202 if ((ehc->i.flags & ATA_EHI_RESUME_LINK) &&
203 (link->flags & ATA_LFLAG_HRST_TO_RESUME))
204 ehc->i.action |= ATA_EH_HARDRESET;
205
206 /* if we're about to do hardreset, nothing more to do */
207 if (ehc->i.action & ATA_EH_HARDRESET)
208 return 0;
209
210 /* resume link */
211 rc = sata_link_resume(link, timing, deadline);
212 if (rc) {
213 /* phy resume failed */
214 ata_link_printk(link, KERN_WARNING, "failed to resume link "
215 "for reset (errno=%d)\n", rc);
216 return rc;
217 }
218
219 /* clear SError bits including .X which blocks the port when set */
220 rc = sata_scr_write(link, SCR_ERROR, 0xffffffff);
221 if (rc) {
222 ata_link_printk(link, KERN_ERR,
223 "failed to clear SError (errno=%d)\n", rc);
224 return rc;
225 }
226
227 return 0;
228}
229
230/**
231 * sata_pmp_std_hardreset - standard hardreset method for PMP link
232 * @link: link to be reset
233 * @class: resulting class of attached device
234 * @deadline: deadline jiffies for the operation
235 *
236 * Hardreset PMP port @link. Note that this function doesn't
237 * wait for BSY clearance. There simply isn't a generic way to
238 * wait the event. Instead, this function return -EAGAIN thus
239 * telling libata-EH to followup with softreset.
240 *
241 * LOCKING:
242 * Kernel thread context (may sleep)
243 *
244 * RETURNS:
245 * 0 on success, -errno otherwise.
246 */
247int sata_pmp_std_hardreset(struct ata_link *link, unsigned int *class,
248 unsigned long deadline)
249{
250 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
251 u32 tmp;
252 int rc;
253
254 DPRINTK("ENTER\n");
255
256 /* do hardreset */
257 rc = sata_link_hardreset(link, timing, deadline);
258 if (rc) {
259 ata_link_printk(link, KERN_ERR,
260 "COMRESET failed (errno=%d)\n", rc);
261 goto out;
262 }
263
264 /* clear SError bits including .X which blocks the port when set */
265 rc = sata_scr_write(link, SCR_ERROR, 0xffffffff);
266 if (rc) {
267 ata_link_printk(link, KERN_ERR, "failed to clear SError "
268 "during hardreset (errno=%d)\n", rc);
269 goto out;
270 }
271
272 /* if device is present, follow up with srst to wait for !BSY */
273 if (ata_link_online(link))
274 rc = -EAGAIN;
275 out:
276 /* if SCR isn't accessible, we need to reset the PMP */
277 if (rc && rc != -EAGAIN && sata_scr_read(link, SCR_STATUS, &tmp))
278 rc = -ERESTART;
279
280 DPRINTK("EXIT, rc=%d\n", rc);
281 return rc;
282}
283
284/**
285 * ata_std_postreset - standard postreset method for PMP link
286 * @link: the target ata_link
287 * @classes: classes of attached devices
288 *
289 * This function is invoked after a successful reset. Note that
290 * the device might have been reset more than once using
291 * different reset methods before postreset is invoked.
292 *
293 * LOCKING:
294 * Kernel thread context (may sleep)
295 */
296void sata_pmp_std_postreset(struct ata_link *link, unsigned int *class)
297{
298 u32 serror;
299
300 DPRINTK("ENTER\n");
301
302 /* clear SError */
303 if (sata_scr_read(link, SCR_ERROR, &serror) == 0)
304 sata_scr_write(link, SCR_ERROR, serror);
305
306 /* print link status */
307 sata_print_link_status(link);
308
309 DPRINTK("EXIT\n");
310}
311
312/**
313 * sata_pmp_read_gscr - read GSCR block of SATA PMP
314 * @dev: PMP device
315 * @gscr: buffer to read GSCR block into
316 *
317 * Read selected PMP GSCRs from the PMP at @dev. This will serve
318 * as configuration and identification info for the PMP.
319 *
320 * LOCKING:
321 * Kernel thread context (may sleep).
322 *
323 * RETURNS:
324 * 0 on success, -errno on failure.
325 */
326static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr)
327{
328 static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 };
329 int i;
330
331 for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) {
332 int reg = gscr_to_read[i];
333 unsigned int err_mask;
334
335 err_mask = sata_pmp_read(dev->link, reg, &gscr[reg]);
336 if (err_mask) {
337 ata_dev_printk(dev, KERN_ERR, "failed to read PMP "
338 "GSCR[%d] (Emask=0x%x)\n", reg, err_mask);
339 return -EIO;
340 }
341 }
342
343 return 0;
344}
345
346static const char *sata_pmp_spec_rev_str(const u32 *gscr)
347{
348 u32 rev = gscr[SATA_PMP_GSCR_REV];
349
350 if (rev & (1 << 2))
351 return "1.1";
352 if (rev & (1 << 1))
353 return "1.0";
354 return "<unknown>";
355}
356
357static int sata_pmp_configure(struct ata_device *dev, int print_info)
358{
359 struct ata_port *ap = dev->link->ap;
360 u32 *gscr = dev->gscr;
361 unsigned int err_mask = 0;
362 const char *reason;
363 int nr_ports, rc;
364
365 nr_ports = sata_pmp_gscr_ports(gscr);
366
367 if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) {
368 rc = -EINVAL;
369 reason = "invalid nr_ports";
370 goto fail;
371 }
372
373 if ((ap->flags & ATA_FLAG_AN) &&
374 (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY))
375 dev->flags |= ATA_DFLAG_AN;
376
377 /* monitor SERR_PHYRDY_CHG on fan-out ports */
378 err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN,
379 SERR_PHYRDY_CHG);
380 if (err_mask) {
381 rc = -EIO;
382 reason = "failed to write GSCR_ERROR_EN";
383 goto fail;
384 }
385
386 /* turn off notification till fan-out ports are reset and configured */
387 if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) {
388 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY;
389
390 err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_FEAT_EN,
391 gscr[SATA_PMP_GSCR_FEAT_EN]);
392 if (err_mask) {
393 rc = -EIO;
394 reason = "failed to write GSCR_FEAT_EN";
395 goto fail;
396 }
397 }
398
399 if (print_info) {
400 ata_dev_printk(dev, KERN_INFO, "Port Multiplier %s, "
401 "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n",
402 sata_pmp_spec_rev_str(gscr),
403 sata_pmp_gscr_vendor(gscr),
404 sata_pmp_gscr_devid(gscr),
405 sata_pmp_gscr_rev(gscr),
406 nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN],
407 gscr[SATA_PMP_GSCR_FEAT]);
408
409 if (!(dev->flags & ATA_DFLAG_AN))
410 ata_dev_printk(dev, KERN_INFO,
411 "Asynchronous notification not supported, "
412 "hotplug won't\n work on fan-out "
413 "ports. Use warm-plug instead.\n");
414 }
415
416 return 0;
417
418 fail:
419 ata_dev_printk(dev, KERN_ERR,
420 "failed to configure Port Multiplier (%s, Emask=0x%x)\n",
421 reason, err_mask);
422 return rc;
423}
424
425static int sata_pmp_init_links(struct ata_port *ap, int nr_ports)
426{
427 struct ata_link *pmp_link = ap->pmp_link;
428 int i;
429
430 if (!pmp_link) {
431 pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS,
432 GFP_NOIO);
433 if (!pmp_link)
434 return -ENOMEM;
435
436 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
437 ata_link_init(ap, &pmp_link[i], i);
438
439 ap->pmp_link = pmp_link;
440 }
441
442 for (i = 0; i < nr_ports; i++) {
443 struct ata_link *link = &pmp_link[i];
444 struct ata_eh_context *ehc = &link->eh_context;
445
446 link->flags = 0;
447 ehc->i.probe_mask |= 1;
448 ehc->i.action |= ATA_EH_SOFTRESET;
449 ehc->i.flags |= ATA_EHI_RESUME_LINK;
450 }
451
452 return 0;
453}
454
455static void sata_pmp_quirks(struct ata_port *ap)
456{
457 u32 *gscr = ap->link.device->gscr;
458 u16 vendor = sata_pmp_gscr_vendor(gscr);
459 u16 devid = sata_pmp_gscr_devid(gscr);
460 struct ata_link *link;
461
462 if (vendor == 0x1095 && devid == 0x3726) {
463 /* sil3726 quirks */
464 ata_port_for_each_link(link, ap) {
465 /* SError.N need a kick in the ass to get working */
466 link->flags |= ATA_LFLAG_HRST_TO_RESUME;
467
468 /* class code report is unreliable */
469 if (link->pmp < 5)
470 link->flags |= ATA_LFLAG_ASSUME_ATA;
471
472 /* port 5 is for SEMB device and it doesn't like SRST */
473 if (link->pmp == 5)
474 link->flags |= ATA_LFLAG_NO_SRST |
475 ATA_LFLAG_ASSUME_SEMB;
476 }
477 } else if (vendor == 0x1095 && devid == 0x4723) {
478 /* sil4723 quirks */
479 ata_port_for_each_link(link, ap) {
480 /* SError.N need a kick in the ass to get working */
481 link->flags |= ATA_LFLAG_HRST_TO_RESUME;
482
483 /* class code report is unreliable */
484 if (link->pmp < 2)
485 link->flags |= ATA_LFLAG_ASSUME_ATA;
486
487 /* the config device at port 2 locks up on SRST */
488 if (link->pmp == 2)
489 link->flags |= ATA_LFLAG_NO_SRST |
490 ATA_LFLAG_ASSUME_ATA;
491 }
492 } else if (vendor == 0x1095 && devid == 0x4726) {
493 /* sil4726 quirks */
494 ata_port_for_each_link(link, ap) {
495 /* SError.N need a kick in the ass to get working */
496 link->flags |= ATA_LFLAG_HRST_TO_RESUME;
497
498 /* class code report is unreliable */
499 if (link->pmp < 5)
500 link->flags |= ATA_LFLAG_ASSUME_ATA;
501
502 /* The config device, which can be either at
503 * port 0 or 5, locks up on SRST.
504 */
505 if (link->pmp == 0 || link->pmp == 5)
506 link->flags |= ATA_LFLAG_NO_SRST |
507 ATA_LFLAG_ASSUME_ATA;
508
509 /* Port 6 is for SEMB device which doesn't
510 * like SRST either.
511 */
512 if (link->pmp == 6)
513 link->flags |= ATA_LFLAG_NO_SRST |
514 ATA_LFLAG_ASSUME_SEMB;
515 }
516 } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 ||
517 devid == 0x5734 || devid == 0x5744)) {
518 /* sil5723/5744 quirks */
519
520 /* sil5723/5744 has either two or three downstream
521 * ports depending on operation mode. The last port
522 * is empty if any actual IO device is available or
523 * occupied by a pseudo configuration device
524 * otherwise. Don't try hard to recover it.
525 */
526 ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY;
527 } else if (vendor == 0x11ab && devid == 0x4140) {
528 /* Marvell 88SM4140 quirks. Fan-out ports require PHY
529 * reset to work; other than that, it behaves very
530 * nicely.
531 */
532 ata_port_for_each_link(link, ap)
533 link->flags |= ATA_LFLAG_HRST_TO_RESUME;
534 }
535}
536
537/**
538 * sata_pmp_attach - attach a SATA PMP device
539 * @dev: SATA PMP device to attach
540 *
541 * Configure and attach SATA PMP device @dev. This function is
542 * also responsible for allocating and initializing PMP links.
543 *
544 * LOCKING:
545 * Kernel thread context (may sleep).
546 *
547 * RETURNS:
548 * 0 on success, -errno on failure.
549 */
550int sata_pmp_attach(struct ata_device *dev)
551{
552 struct ata_link *link = dev->link;
553 struct ata_port *ap = link->ap;
554 unsigned long flags;
555 struct ata_link *tlink;
556 int rc;
557
558 /* is it hanging off the right place? */
559 if (!(ap->flags & ATA_FLAG_PMP)) {
560 ata_dev_printk(dev, KERN_ERR,
561 "host does not support Port Multiplier\n");
562 return -EINVAL;
563 }
564
565 if (!ata_is_host_link(link)) {
566 ata_dev_printk(dev, KERN_ERR,
567 "Port Multipliers cannot be nested\n");
568 return -EINVAL;
569 }
570
571 if (dev->devno) {
572 ata_dev_printk(dev, KERN_ERR,
573 "Port Multiplier must be the first device\n");
574 return -EINVAL;
575 }
576
577 WARN_ON(link->pmp != 0);
578 link->pmp = SATA_PMP_CTRL_PORT;
579
580 /* read GSCR block */
581 rc = sata_pmp_read_gscr(dev, dev->gscr);
582 if (rc)
583 goto fail;
584
585 /* config PMP */
586 rc = sata_pmp_configure(dev, 1);
587 if (rc)
588 goto fail;
589
590 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr));
591 if (rc) {
592 ata_dev_printk(dev, KERN_INFO,
593 "failed to initialize PMP links\n");
594 goto fail;
595 }
596
597 /* attach it */
598 spin_lock_irqsave(ap->lock, flags);
599 WARN_ON(ap->nr_pmp_links);
600 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr);
601 spin_unlock_irqrestore(ap->lock, flags);
602
603 sata_pmp_quirks(ap);
604
605 if (ap->ops->pmp_attach)
606 ap->ops->pmp_attach(ap);
607
608 ata_port_for_each_link(tlink, ap)
609 sata_link_init_spd(tlink);
610
611 ata_acpi_associate_sata_port(ap);
612
613 return 0;
614
615 fail:
616 link->pmp = 0;
617 return rc;
618}
619
620/**
621 * sata_pmp_detach - detach a SATA PMP device
622 * @dev: SATA PMP device to detach
623 *
624 * Detach SATA PMP device @dev. This function is also
625 * responsible for deconfiguring PMP links.
626 *
627 * LOCKING:
628 * Kernel thread context (may sleep).
629 */
630static void sata_pmp_detach(struct ata_device *dev)
631{
632 struct ata_link *link = dev->link;
633 struct ata_port *ap = link->ap;
634 struct ata_link *tlink;
635 unsigned long flags;
636
637 ata_dev_printk(dev, KERN_INFO, "Port Multiplier detaching\n");
638
639 WARN_ON(!ata_is_host_link(link) || dev->devno ||
640 link->pmp != SATA_PMP_CTRL_PORT);
641
642 if (ap->ops->pmp_detach)
643 ap->ops->pmp_detach(ap);
644
645 ata_port_for_each_link(tlink, ap)
646 ata_eh_detach_dev(tlink->device);
647
648 spin_lock_irqsave(ap->lock, flags);
649 ap->nr_pmp_links = 0;
650 link->pmp = 0;
651 spin_unlock_irqrestore(ap->lock, flags);
652
653 ata_acpi_associate_sata_port(ap);
654}
655
656/**
657 * sata_pmp_same_pmp - does new GSCR matches the configured PMP?
658 * @dev: PMP device to compare against
659 * @new_gscr: GSCR block of the new device
660 *
661 * Compare @new_gscr against @dev and determine whether @dev is
662 * the PMP described by @new_gscr.
663 *
664 * LOCKING:
665 * None.
666 *
667 * RETURNS:
668 * 1 if @dev matches @new_gscr, 0 otherwise.
669 */
670static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr)
671{
672 const u32 *old_gscr = dev->gscr;
673 u16 old_vendor, new_vendor, old_devid, new_devid;
674 int old_nr_ports, new_nr_ports;
675
676 old_vendor = sata_pmp_gscr_vendor(old_gscr);
677 new_vendor = sata_pmp_gscr_vendor(new_gscr);
678 old_devid = sata_pmp_gscr_devid(old_gscr);
679 new_devid = sata_pmp_gscr_devid(new_gscr);
680 old_nr_ports = sata_pmp_gscr_ports(old_gscr);
681 new_nr_ports = sata_pmp_gscr_ports(new_gscr);
682
683 if (old_vendor != new_vendor) {
684 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
685 "vendor mismatch '0x%x' != '0x%x'\n",
686 old_vendor, new_vendor);
687 return 0;
688 }
689
690 if (old_devid != new_devid) {
691 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
692 "device ID mismatch '0x%x' != '0x%x'\n",
693 old_devid, new_devid);
694 return 0;
695 }
696
697 if (old_nr_ports != new_nr_ports) {
698 ata_dev_printk(dev, KERN_INFO, "Port Multiplier "
699 "nr_ports mismatch '0x%x' != '0x%x'\n",
700 old_nr_ports, new_nr_ports);
701 return 0;
702 }
703
704 return 1;
705}
706
707/**
708 * sata_pmp_revalidate - revalidate SATA PMP
709 * @dev: PMP device to revalidate
710 * @new_class: new class code
711 *
712 * Re-read GSCR block and make sure @dev is still attached to the
713 * port and properly configured.
714 *
715 * LOCKING:
716 * Kernel thread context (may sleep).
717 *
718 * RETURNS:
719 * 0 on success, -errno otherwise.
720 */
721static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class)
722{
723 struct ata_link *link = dev->link;
724 struct ata_port *ap = link->ap;
725 u32 *gscr = (void *)ap->sector_buf;
726 int rc;
727
728 DPRINTK("ENTER\n");
729
730 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE);
731
732 if (!ata_dev_enabled(dev)) {
733 rc = -ENODEV;
734 goto fail;
735 }
736
737 /* wrong class? */
738 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) {
739 rc = -ENODEV;
740 goto fail;
741 }
742
743 /* read GSCR */
744 rc = sata_pmp_read_gscr(dev, gscr);
745 if (rc)
746 goto fail;
747
748 /* is the pmp still there? */
749 if (!sata_pmp_same_pmp(dev, gscr)) {
750 rc = -ENODEV;
751 goto fail;
752 }
753
754 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS);
755
756 rc = sata_pmp_configure(dev, 0);
757 if (rc)
758 goto fail;
759
760 ata_eh_done(link, NULL, ATA_EH_REVALIDATE);
761
762 DPRINTK("EXIT, rc=0\n");
763 return 0;
764
765 fail:
766 ata_dev_printk(dev, KERN_ERR,
767 "PMP revalidation failed (errno=%d)\n", rc);
768 DPRINTK("EXIT, rc=%d\n", rc);
769 return rc;
770}
771
772/**
773 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly
774 * @dev: PMP device to revalidate
775 *
776 * Make sure the attached PMP is accessible.
777 *
778 * LOCKING:
779 * Kernel thread context (may sleep).
780 *
781 * RETURNS:
782 * 0 on success, -errno otherwise.
783 */
784static int sata_pmp_revalidate_quick(struct ata_device *dev)
785{
786 unsigned int err_mask;
787 u32 prod_id;
788
789 err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id);
790 if (err_mask) {
791 ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID "
792 "(Emask=0x%x)\n", err_mask);
793 return -EIO;
794 }
795
796 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) {
797 ata_dev_printk(dev, KERN_ERR, "PMP product ID mismatch\n");
798 /* something weird is going on, request full PMP recovery */
799 return -EIO;
800 }
801
802 return 0;
803}
804
805/**
806 * sata_pmp_eh_recover_pmp - recover PMP
807 * @ap: ATA port PMP is attached to
808 * @prereset: prereset method (can be NULL)
809 * @softreset: softreset method
810 * @hardreset: hardreset method
811 * @postreset: postreset method (can be NULL)
812 *
813 * Recover PMP attached to @ap. Recovery procedure is somewhat
814 * similar to that of ata_eh_recover() except that reset should
815 * always be performed in hard->soft sequence and recovery
816 * failure results in PMP detachment.
817 *
818 * LOCKING:
819 * Kernel thread context (may sleep).
820 *
821 * RETURNS:
822 * 0 on success, -errno on failure.
823 */
824static int sata_pmp_eh_recover_pmp(struct ata_port *ap,
825 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
826 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
827{
828 struct ata_link *link = &ap->link;
829 struct ata_eh_context *ehc = &link->eh_context;
830 struct ata_device *dev = link->device;
831 int tries = ATA_EH_PMP_TRIES;
832 int detach = 0, rc = 0;
833 int reval_failed = 0;
834
835 DPRINTK("ENTER\n");
836
837 if (dev->flags & ATA_DFLAG_DETACH) {
838 detach = 1;
839 goto fail;
840 }
841
842 retry:
843 ehc->classes[0] = ATA_DEV_UNKNOWN;
844
845 if (ehc->i.action & ATA_EH_RESET_MASK) {
846 struct ata_link *tlink;
847
848 ata_eh_freeze_port(ap);
849
850 /* reset */
851 ehc->i.action = ATA_EH_HARDRESET;
852 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset,
853 postreset);
854 if (rc) {
855 ata_link_printk(link, KERN_ERR,
856 "failed to reset PMP, giving up\n");
857 goto fail;
858 }
859
860 ata_eh_thaw_port(ap);
861
862 /* PMP is reset, SErrors cannot be trusted, scan all */
863 ata_port_for_each_link(tlink, ap)
864 ata_ehi_schedule_probe(&tlink->eh_context.i);
865 }
866
867 /* If revalidation is requested, revalidate and reconfigure;
868 * otherwise, do quick revalidation.
869 */
870 if (ehc->i.action & ATA_EH_REVALIDATE)
871 rc = sata_pmp_revalidate(dev, ehc->classes[0]);
872 else
873 rc = sata_pmp_revalidate_quick(dev);
874
875 if (rc) {
876 tries--;
877
878 if (rc == -ENODEV) {
879 ehc->i.probe_mask |= 1;
880 detach = 1;
881 /* give it just two more chances */
882 tries = min(tries, 2);
883 }
884
885 if (tries) {
886 int sleep = ehc->i.flags & ATA_EHI_DID_RESET;
887
888 /* consecutive revalidation failures? speed down */
889 if (reval_failed)
890 sata_down_spd_limit(link);
891 else
892 reval_failed = 1;
893
894 ata_dev_printk(dev, KERN_WARNING,
895 "retrying hardreset%s\n",
896 sleep ? " in 5 secs" : "");
897 if (sleep)
898 ssleep(5);
899 ehc->i.action |= ATA_EH_HARDRESET;
900 goto retry;
901 } else {
902 ata_dev_printk(dev, KERN_ERR, "failed to recover PMP "
903 "after %d tries, giving up\n",
904 ATA_EH_PMP_TRIES);
905 goto fail;
906 }
907 }
908
909 /* okay, PMP resurrected */
910 ehc->i.flags = 0;
911
912 DPRINTK("EXIT, rc=0\n");
913 return 0;
914
915 fail:
916 sata_pmp_detach(dev);
917 if (detach)
918 ata_eh_detach_dev(dev);
919 else
920 ata_dev_disable(dev);
921
922 DPRINTK("EXIT, rc=%d\n", rc);
923 return rc;
924}
925
926static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap)
927{
928 struct ata_link *link;
929 unsigned long flags;
930 int rc;
931
932 spin_lock_irqsave(ap->lock, flags);
933
934 ata_port_for_each_link(link, ap) {
935 if (!(link->flags & ATA_LFLAG_DISABLED))
936 continue;
937
938 spin_unlock_irqrestore(ap->lock, flags);
939
940 /* Some PMPs require hardreset sequence to get
941 * SError.N working.
942 */
943 if ((link->flags & ATA_LFLAG_HRST_TO_RESUME) &&
944 (link->eh_context.i.flags & ATA_EHI_RESUME_LINK))
945 sata_link_hardreset(link, sata_deb_timing_normal,
946 jiffies + ATA_TMOUT_INTERNAL_QUICK);
947
948 /* unconditionally clear SError.N */
949 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
950 if (rc) {
951 ata_link_printk(link, KERN_ERR, "failed to clear "
952 "SError.N (errno=%d)\n", rc);
953 return rc;
954 }
955
956 spin_lock_irqsave(ap->lock, flags);
957 }
958
959 spin_unlock_irqrestore(ap->lock, flags);
960
961 return 0;
962}
963
964static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries)
965{
966 struct ata_port *ap = link->ap;
967 unsigned long flags;
968
969 if (link_tries[link->pmp] && --link_tries[link->pmp])
970 return 1;
971
972 /* disable this link */
973 if (!(link->flags & ATA_LFLAG_DISABLED)) {
974 ata_link_printk(link, KERN_WARNING,
975 "failed to recover link after %d tries, disabling\n",
976 ATA_EH_PMP_LINK_TRIES);
977
978 spin_lock_irqsave(ap->lock, flags);
979 link->flags |= ATA_LFLAG_DISABLED;
980 spin_unlock_irqrestore(ap->lock, flags);
981 }
982
983 ata_dev_disable(link->device);
984 link->eh_context.i.action = 0;
985
986 return 0;
987}
988
989/**
990 * sata_pmp_eh_recover - recover PMP-enabled port
991 * @ap: ATA port to recover
992 * @prereset: prereset method (can be NULL)
993 * @softreset: softreset method
994 * @hardreset: hardreset method
995 * @postreset: postreset method (can be NULL)
996 * @pmp_prereset: PMP prereset method (can be NULL)
997 * @pmp_softreset: PMP softreset method (can be NULL)
998 * @pmp_hardreset: PMP hardreset method (can be NULL)
999 * @pmp_postreset: PMP postreset method (can be NULL)
1000 *
1001 * Drive EH recovery operation for PMP enabled port @ap. This
1002 * function recovers host and PMP ports with proper retrials and
1003 * fallbacks. Actual recovery operations are performed using
1004 * ata_eh_recover() and sata_pmp_eh_recover_pmp().
1005 *
1006 * LOCKING:
1007 * Kernel thread context (may sleep).
1008 *
1009 * RETURNS:
1010 * 0 on success, -errno on failure.
1011 */
1012static int sata_pmp_eh_recover(struct ata_port *ap,
1013 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
1014 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset,
1015 ata_prereset_fn_t pmp_prereset, ata_reset_fn_t pmp_softreset,
1016 ata_reset_fn_t pmp_hardreset, ata_postreset_fn_t pmp_postreset)
1017{
1018 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS];
1019 struct ata_link *pmp_link = &ap->link;
1020 struct ata_device *pmp_dev = pmp_link->device;
1021 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context;
1022 struct ata_link *link;
1023 struct ata_device *dev;
1024 unsigned int err_mask;
1025 u32 gscr_error, sntf;
1026 int cnt, rc;
1027
1028 pmp_tries = ATA_EH_PMP_TRIES;
1029 ata_port_for_each_link(link, ap)
1030 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
1031
1032 retry:
1033 /* PMP attached? */
1034 if (!ap->nr_pmp_links) {
1035 rc = ata_eh_recover(ap, prereset, softreset, hardreset,
1036 postreset, NULL);
1037 if (rc) {
1038 ata_link_for_each_dev(dev, &ap->link)
1039 ata_dev_disable(dev);
1040 return rc;
1041 }
1042
1043 if (pmp_dev->class != ATA_DEV_PMP)
1044 return 0;
1045
1046 /* new PMP online */
1047 ata_port_for_each_link(link, ap)
1048 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
1049
1050 /* fall through */
1051 }
1052
1053 /* recover pmp */
1054 rc = sata_pmp_eh_recover_pmp(ap, prereset, softreset, hardreset,
1055 postreset);
1056 if (rc)
1057 goto pmp_fail;
1058
1059 /* handle disabled links */
1060 rc = sata_pmp_eh_handle_disabled_links(ap);
1061 if (rc)
1062 goto pmp_fail;
1063
1064 /* recover links */
1065 rc = ata_eh_recover(ap, pmp_prereset, pmp_softreset, pmp_hardreset,
1066 pmp_postreset, &link);
1067 if (rc)
1068 goto link_fail;
1069
1070 /* Connection status might have changed while resetting other
1071 * links, check SATA_PMP_GSCR_ERROR before returning.
1072 */
1073
1074 /* clear SNotification */
1075 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
1076 if (rc == 0)
1077 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
1078
1079 /* enable notification */
1080 if (pmp_dev->flags & ATA_DFLAG_AN) {
1081 pmp_dev->gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY;
1082
1083 err_mask = sata_pmp_write(pmp_dev->link, SATA_PMP_GSCR_FEAT_EN,
1084 pmp_dev->gscr[SATA_PMP_GSCR_FEAT_EN]);
1085 if (err_mask) {
1086 ata_dev_printk(pmp_dev, KERN_ERR, "failed to write "
1087 "PMP_FEAT_EN (Emask=0x%x)\n", err_mask);
1088 rc = -EIO;
1089 goto pmp_fail;
1090 }
1091 }
1092
1093 /* check GSCR_ERROR */
1094 err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error);
1095 if (err_mask) {
1096 ata_dev_printk(pmp_dev, KERN_ERR, "failed to read "
1097 "PMP_GSCR_ERROR (Emask=0x%x)\n", err_mask);
1098 rc = -EIO;
1099 goto pmp_fail;
1100 }
1101
1102 cnt = 0;
1103 ata_port_for_each_link(link, ap) {
1104 if (!(gscr_error & (1 << link->pmp)))
1105 continue;
1106
1107 if (sata_pmp_handle_link_fail(link, link_tries)) {
1108 ata_ehi_hotplugged(&link->eh_context.i);
1109 cnt++;
1110 } else {
1111 ata_link_printk(link, KERN_WARNING,
1112 "PHY status changed but maxed out on retries, "
1113 "giving up\n");
1114 ata_link_printk(link, KERN_WARNING,
1115 "Manully issue scan to resume this link\n");
1116 }
1117 }
1118
1119 if (cnt) {
1120 ata_port_printk(ap, KERN_INFO, "PMP SError.N set for some "
1121 "ports, repeating recovery\n");
1122 goto retry;
1123 }
1124
1125 return 0;
1126
1127 link_fail:
1128 if (sata_pmp_handle_link_fail(link, link_tries)) {
1129 pmp_ehc->i.action |= ATA_EH_HARDRESET;
1130 goto retry;
1131 }
1132
1133 /* fall through */
1134 pmp_fail:
1135 /* Control always ends up here after detaching PMP. Shut up
1136 * and return if we're unloading.
1137 */
1138 if (ap->pflags & ATA_PFLAG_UNLOADING)
1139 return rc;
1140
1141 if (!ap->nr_pmp_links)
1142 goto retry;
1143
1144 if (--pmp_tries) {
1145 ata_port_printk(ap, KERN_WARNING,
1146 "failed to recover PMP, retrying in 5 secs\n");
1147 pmp_ehc->i.action |= ATA_EH_HARDRESET;
1148 ssleep(5);
1149 goto retry;
1150 }
1151
1152 ata_port_printk(ap, KERN_ERR,
1153 "failed to recover PMP after %d tries, giving up\n",
1154 ATA_EH_PMP_TRIES);
1155 sata_pmp_detach(pmp_dev);
1156 ata_dev_disable(pmp_dev);
1157
1158 return rc;
1159}
1160
1161/**
1162 * sata_pmp_do_eh - do standard error handling for PMP-enabled host
1163 * @ap: host port to handle error for
1164 * @prereset: prereset method (can be NULL)
1165 * @softreset: softreset method
1166 * @hardreset: hardreset method
1167 * @postreset: postreset method (can be NULL)
1168 * @pmp_prereset: PMP prereset method (can be NULL)
1169 * @pmp_softreset: PMP softreset method (can be NULL)
1170 * @pmp_hardreset: PMP hardreset method (can be NULL)
1171 * @pmp_postreset: PMP postreset method (can be NULL)
1172 *
1173 * Perform standard error handling sequence for PMP-enabled host
1174 * @ap.
1175 *
1176 * LOCKING:
1177 * Kernel thread context (may sleep).
1178 */
1179void sata_pmp_do_eh(struct ata_port *ap,
1180 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
1181 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset,
1182 ata_prereset_fn_t pmp_prereset, ata_reset_fn_t pmp_softreset,
1183 ata_reset_fn_t pmp_hardreset, ata_postreset_fn_t pmp_postreset)
1184{
1185 ata_eh_autopsy(ap);
1186 ata_eh_report(ap);
1187 sata_pmp_eh_recover(ap, prereset, softreset, hardreset, postreset,
1188 pmp_prereset, pmp_softreset, pmp_hardreset,
1189 pmp_postreset);
1190 ata_eh_finish(ap);
1191}
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-01 21:17:11 -0500