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3af9a77a TH |
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 | * Wrapper around ap->ops->pmp_read to make it easier to call and | |
21 | * nomarlize error return value. | |
22 | * | |
23 | * LOCKING: | |
24 | * Kernel thread context (may sleep). | |
25 | * | |
26 | * RETURNS: | |
27 | * 0 on success, -errno on failure. | |
28 | */ | |
29 | static int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val) | |
30 | { | |
31 | struct ata_port *ap = link->ap; | |
32 | struct ata_device *pmp_dev = ap->link.device; | |
33 | int rc; | |
34 | ||
35 | might_sleep(); | |
36 | ||
37 | rc = ap->ops->pmp_read(pmp_dev, link->pmp, reg, r_val); | |
38 | if (rc) | |
39 | rc = -EIO; | |
40 | return rc; | |
41 | } | |
42 | ||
43 | /** | |
44 | * sata_pmp_write - write PMP register | |
45 | * @link: link to write PMP register for | |
46 | * @reg: register to write | |
47 | * @r_val: value to write | |
48 | * | |
49 | * Wrapper around ap->ops->pmp_write to make it easier to call | |
50 | * and nomarlize error return value. | |
51 | * | |
52 | * LOCKING: | |
53 | * Kernel thread context (may sleep). | |
54 | * | |
55 | * RETURNS: | |
56 | * 0 on success, -errno on failure. | |
57 | */ | |
58 | static int sata_pmp_write(struct ata_link *link, int reg, u32 val) | |
59 | { | |
60 | struct ata_port *ap = link->ap; | |
61 | struct ata_device *pmp_dev = ap->link.device; | |
62 | int rc; | |
63 | ||
64 | might_sleep(); | |
65 | ||
66 | rc = ap->ops->pmp_write(pmp_dev, link->pmp, reg, val); | |
67 | if (rc) | |
68 | rc = -EIO; | |
69 | return rc; | |
70 | } | |
71 | ||
31f88384 TH |
72 | /** |
73 | * sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP | |
74 | * @qc: ATA command in question | |
75 | * | |
76 | * A host which has command switching PMP support cannot issue | |
77 | * commands to multiple links simultaneously. | |
78 | * | |
79 | * LOCKING: | |
80 | * spin_lock_irqsave(host lock) | |
81 | * | |
82 | * RETURNS: | |
83 | * ATA_DEFER_* if deferring is needed, 0 otherwise. | |
84 | */ | |
85 | int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc) | |
86 | { | |
87 | struct ata_link *link = qc->dev->link; | |
88 | struct ata_port *ap = link->ap; | |
89 | ||
90 | if (ap->excl_link == NULL || ap->excl_link == link) { | |
91 | if (ap->nr_active_links == 0 || ata_link_active(link)) { | |
92 | qc->flags |= ATA_QCFLAG_CLEAR_EXCL; | |
93 | return ata_std_qc_defer(qc); | |
94 | } | |
95 | ||
96 | ap->excl_link = link; | |
97 | } | |
98 | ||
99 | return ATA_DEFER_PORT; | |
100 | } | |
101 | ||
3af9a77a TH |
102 | /** |
103 | * sata_pmp_read_init_tf - initialize TF for PMP read | |
104 | * @tf: taskfile to initialize | |
105 | * @dev: PMP dev | |
106 | * @pmp: port multiplier port number | |
107 | * @reg: register to read | |
108 | * | |
109 | * Initialize @tf for PMP read command. | |
110 | * | |
111 | * LOCKING: | |
112 | * None. | |
113 | */ | |
114 | void sata_pmp_read_init_tf(struct ata_taskfile *tf, | |
115 | struct ata_device *dev, int pmp, int reg) | |
116 | { | |
117 | ata_tf_init(dev, tf); | |
118 | tf->command = ATA_CMD_PMP_READ; | |
119 | tf->protocol = ATA_PROT_NODATA; | |
120 | tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; | |
121 | tf->feature = reg; | |
122 | tf->device = pmp; | |
123 | } | |
124 | ||
125 | /** | |
126 | * sata_pmp_read_val - extract PMP read result from TF | |
127 | * @tf: target TF | |
128 | * | |
129 | * Determine PMP read result from @tf. | |
130 | * | |
131 | * LOCKING: | |
132 | * None. | |
133 | */ | |
134 | u32 sata_pmp_read_val(const struct ata_taskfile *tf) | |
135 | { | |
136 | return tf->nsect | tf->lbal << 8 | tf->lbam << 16 | tf->lbah << 24; | |
137 | } | |
138 | ||
139 | /** | |
140 | * sata_pmp_read_init_tf - initialize TF for PMP write | |
141 | * @tf: taskfile to initialize | |
142 | * @dev: PMP dev | |
143 | * @pmp: port multiplier port number | |
144 | * @reg: register to read | |
145 | * @val: value to write | |
146 | * | |
147 | * Initialize @tf for PMP write command. | |
148 | * | |
149 | * LOCKING: | |
150 | * None. | |
151 | */ | |
152 | void sata_pmp_write_init_tf(struct ata_taskfile *tf, | |
153 | struct ata_device *dev, int pmp, int reg, u32 val) | |
154 | { | |
155 | ata_tf_init(dev, tf); | |
156 | tf->command = ATA_CMD_PMP_WRITE; | |
157 | tf->protocol = ATA_PROT_NODATA; | |
158 | tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; | |
159 | tf->feature = reg; | |
160 | tf->device = pmp; | |
161 | tf->nsect = val & 0xff; | |
162 | tf->lbal = (val >> 8) & 0xff; | |
163 | tf->lbam = (val >> 16) & 0xff; | |
164 | tf->lbah = (val >> 24) & 0xff; | |
165 | } | |
166 | ||
167 | /** | |
168 | * sata_pmp_scr_read - read PSCR | |
169 | * @link: ATA link to read PSCR for | |
170 | * @reg: PSCR to read | |
171 | * @r_val: resulting value | |
172 | * | |
173 | * Read PSCR @reg into @r_val for @link, to be called from | |
174 | * ata_scr_read(). | |
175 | * | |
176 | * LOCKING: | |
177 | * Kernel thread context (may sleep). | |
178 | * | |
179 | * RETURNS: | |
180 | * 0 on success, -errno on failure. | |
181 | */ | |
182 | int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val) | |
183 | { | |
184 | if (reg > SATA_PMP_PSCR_CONTROL) | |
185 | return -EINVAL; | |
186 | ||
187 | return sata_pmp_read(link, reg, r_val); | |
188 | } | |
189 | ||
190 | /** | |
191 | * sata_pmp_scr_write - write PSCR | |
192 | * @link: ATA link to write PSCR for | |
193 | * @reg: PSCR to write | |
194 | * @val: value to be written | |
195 | * | |
196 | * Write @val to PSCR @reg for @link, to be called from | |
197 | * ata_scr_write() and ata_scr_write_flush(). | |
198 | * | |
199 | * LOCKING: | |
200 | * Kernel thread context (may sleep). | |
201 | * | |
202 | * RETURNS: | |
203 | * 0 on success, -errno on failure. | |
204 | */ | |
205 | int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val) | |
206 | { | |
207 | if (reg > SATA_PMP_PSCR_CONTROL) | |
208 | return -EINVAL; | |
209 | ||
210 | return sata_pmp_write(link, reg, val); | |
211 | } | |
212 | ||
213 | /** | |
214 | * sata_pmp_std_prereset - prepare PMP link for reset | |
215 | * @link: link to be reset | |
216 | * @deadline: deadline jiffies for the operation | |
217 | * | |
218 | * @link is about to be reset. Initialize it. | |
219 | * | |
220 | * LOCKING: | |
221 | * Kernel thread context (may sleep) | |
222 | * | |
223 | * RETURNS: | |
224 | * 0 on success, -errno otherwise. | |
225 | */ | |
226 | int sata_pmp_std_prereset(struct ata_link *link, unsigned long deadline) | |
227 | { | |
228 | struct ata_eh_context *ehc = &link->eh_context; | |
229 | const unsigned long *timing = sata_ehc_deb_timing(ehc); | |
230 | int rc; | |
231 | ||
232 | /* force HRST? */ | |
233 | if (link->flags & ATA_LFLAG_NO_SRST) | |
234 | ehc->i.action |= ATA_EH_HARDRESET; | |
235 | ||
236 | /* handle link resume */ | |
237 | if ((ehc->i.flags & ATA_EHI_RESUME_LINK) && | |
238 | (link->flags & ATA_LFLAG_HRST_TO_RESUME)) | |
239 | ehc->i.action |= ATA_EH_HARDRESET; | |
240 | ||
241 | /* if we're about to do hardreset, nothing more to do */ | |
242 | if (ehc->i.action & ATA_EH_HARDRESET) | |
243 | return 0; | |
244 | ||
245 | /* resume link */ | |
246 | rc = sata_link_resume(link, timing, deadline); | |
247 | if (rc) { | |
248 | /* phy resume failed */ | |
249 | ata_link_printk(link, KERN_WARNING, "failed to resume link " | |
250 | "for reset (errno=%d)\n", rc); | |
251 | return rc; | |
252 | } | |
253 | ||
254 | /* clear SError bits including .X which blocks the port when set */ | |
255 | rc = sata_scr_write(link, SCR_ERROR, 0xffffffff); | |
256 | if (rc) { | |
257 | ata_link_printk(link, KERN_ERR, | |
258 | "failed to clear SError (errno=%d)\n", rc); | |
259 | return rc; | |
260 | } | |
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
265 | /** | |
266 | * sata_pmp_std_hardreset - standard hardreset method for PMP link | |
267 | * @link: link to be reset | |
268 | * @class: resulting class of attached device | |
269 | * @deadline: deadline jiffies for the operation | |
270 | * | |
271 | * Hardreset PMP port @link. Note that this function doesn't | |
272 | * wait for BSY clearance. There simply isn't a generic way to | |
273 | * wait the event. Instead, this function return -EAGAIN thus | |
274 | * telling libata-EH to followup with softreset. | |
275 | * | |
276 | * LOCKING: | |
277 | * Kernel thread context (may sleep) | |
278 | * | |
279 | * RETURNS: | |
280 | * 0 on success, -errno otherwise. | |
281 | */ | |
282 | int sata_pmp_std_hardreset(struct ata_link *link, unsigned int *class, | |
283 | unsigned long deadline) | |
284 | { | |
285 | const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context); | |
286 | u32 tmp; | |
287 | int rc; | |
288 | ||
289 | DPRINTK("ENTER\n"); | |
290 | ||
291 | /* do hardreset */ | |
292 | rc = sata_link_hardreset(link, timing, deadline); | |
293 | if (rc) { | |
294 | ata_link_printk(link, KERN_ERR, | |
295 | "COMRESET failed (errno=%d)\n", rc); | |
296 | goto out; | |
297 | } | |
298 | ||
299 | /* clear SError bits including .X which blocks the port when set */ | |
300 | rc = sata_scr_write(link, SCR_ERROR, 0xffffffff); | |
301 | if (rc) { | |
302 | ata_link_printk(link, KERN_ERR, "failed to clear SError " | |
303 | "during hardreset (errno=%d)\n", rc); | |
304 | goto out; | |
305 | } | |
306 | ||
307 | /* if device is present, follow up with srst to wait for !BSY */ | |
308 | if (ata_link_online(link)) | |
309 | rc = -EAGAIN; | |
310 | out: | |
311 | /* if SCR isn't accessible, we need to reset the PMP */ | |
312 | if (rc && rc != -EAGAIN && sata_scr_read(link, SCR_STATUS, &tmp)) | |
313 | rc = -ERESTART; | |
314 | ||
315 | DPRINTK("EXIT, rc=%d\n", rc); | |
316 | return rc; | |
317 | } | |
318 | ||
319 | /** | |
320 | * ata_std_postreset - standard postreset method for PMP link | |
321 | * @link: the target ata_link | |
322 | * @classes: classes of attached devices | |
323 | * | |
324 | * This function is invoked after a successful reset. Note that | |
325 | * the device might have been reset more than once using | |
326 | * different reset methods before postreset is invoked. | |
327 | * | |
328 | * LOCKING: | |
329 | * Kernel thread context (may sleep) | |
330 | */ | |
331 | void sata_pmp_std_postreset(struct ata_link *link, unsigned int *class) | |
332 | { | |
333 | u32 serror; | |
334 | ||
335 | DPRINTK("ENTER\n"); | |
336 | ||
337 | /* clear SError */ | |
338 | if (sata_scr_read(link, SCR_ERROR, &serror) == 0) | |
339 | sata_scr_write(link, SCR_ERROR, serror); | |
340 | ||
341 | /* print link status */ | |
342 | sata_print_link_status(link); | |
343 | ||
344 | DPRINTK("EXIT\n"); | |
345 | } | |
346 | ||
347 | /** | |
348 | * sata_pmp_read_gscr - read GSCR block of SATA PMP | |
349 | * @dev: PMP device | |
350 | * @gscr: buffer to read GSCR block into | |
351 | * | |
352 | * Read selected PMP GSCRs from the PMP at @dev. This will serve | |
353 | * as configuration and identification info for the PMP. | |
354 | * | |
355 | * LOCKING: | |
356 | * Kernel thread context (may sleep). | |
357 | * | |
358 | * RETURNS: | |
359 | * 0 on success, -errno on failure. | |
360 | */ | |
361 | static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr) | |
362 | { | |
363 | static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 }; | |
364 | int i, rc; | |
365 | ||
366 | for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) { | |
367 | int reg = gscr_to_read[i]; | |
368 | ||
369 | rc = sata_pmp_read(dev->link, reg, &gscr[reg]); | |
370 | if (rc) { | |
371 | ata_dev_printk(dev, KERN_ERR, "failed to read " | |
372 | "PMP GSCR[%d] (errno=%d)\n", reg, rc); | |
373 | return rc; | |
374 | } | |
375 | } | |
376 | ||
377 | return 0; | |
378 | } | |
379 | ||
380 | static const char *sata_pmp_spec_rev_str(const u32 *gscr) | |
381 | { | |
382 | u32 rev = gscr[SATA_PMP_GSCR_REV]; | |
383 | ||
384 | if (rev & (1 << 2)) | |
385 | return "1.1"; | |
386 | if (rev & (1 << 1)) | |
387 | return "1.0"; | |
388 | return "<unknown>"; | |
389 | } | |
390 | ||
391 | static int sata_pmp_configure(struct ata_device *dev, int print_info) | |
392 | { | |
393 | struct ata_port *ap = dev->link->ap; | |
394 | u32 *gscr = dev->gscr; | |
395 | const char *reason; | |
396 | int nr_ports, rc; | |
397 | ||
398 | nr_ports = sata_pmp_gscr_ports(gscr); | |
399 | ||
400 | if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) { | |
401 | rc = -EINVAL; | |
402 | reason = "invalid nr_ports"; | |
403 | goto fail; | |
404 | } | |
405 | ||
406 | if ((ap->flags & ATA_FLAG_AN) && | |
407 | (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY)) | |
408 | dev->flags |= ATA_DFLAG_AN; | |
409 | ||
410 | /* monitor SERR_PHYRDY_CHG on fan-out ports */ | |
411 | rc = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN, SERR_PHYRDY_CHG); | |
412 | if (rc) { | |
413 | reason = "failed to write GSCR_ERROR_EN"; | |
414 | goto fail; | |
415 | } | |
416 | ||
417 | /* turn off notification till fan-out ports are reset and configured */ | |
418 | if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) { | |
419 | gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY; | |
420 | ||
421 | rc = sata_pmp_write(dev->link, SATA_PMP_GSCR_FEAT_EN, | |
422 | gscr[SATA_PMP_GSCR_FEAT_EN]); | |
423 | if (rc) { | |
424 | reason = "failed to write GSCR_FEAT_EN"; | |
425 | goto fail; | |
426 | } | |
427 | } | |
428 | ||
429 | if (print_info) { | |
430 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier %s, " | |
431 | "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n", | |
432 | sata_pmp_spec_rev_str(gscr), | |
433 | sata_pmp_gscr_vendor(gscr), | |
434 | sata_pmp_gscr_devid(gscr), | |
435 | sata_pmp_gscr_rev(gscr), | |
436 | nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN], | |
437 | gscr[SATA_PMP_GSCR_FEAT]); | |
438 | ||
439 | if (!(dev->flags & ATA_DFLAG_AN)) | |
440 | ata_dev_printk(dev, KERN_INFO, | |
441 | "Asynchronous notification not supported, " | |
442 | "hotplug won't\n work on fan-out " | |
443 | "ports. Use warm-plug instead.\n"); | |
444 | } | |
445 | ||
446 | return 0; | |
447 | ||
448 | fail: | |
449 | ata_dev_printk(dev, KERN_ERR, | |
450 | "failed to configure Port Multiplier (%s)\n", reason); | |
451 | return rc; | |
452 | } | |
453 | ||
454 | static int sata_pmp_init_links(struct ata_port *ap, int nr_ports) | |
455 | { | |
456 | struct ata_link *pmp_link = ap->pmp_link; | |
457 | int i; | |
458 | ||
459 | if (!pmp_link) { | |
460 | pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS, | |
461 | GFP_NOIO); | |
462 | if (!pmp_link) | |
463 | return -ENOMEM; | |
464 | ||
465 | for (i = 0; i < SATA_PMP_MAX_PORTS; i++) | |
466 | ata_link_init(ap, &pmp_link[i], i); | |
467 | ||
468 | ap->pmp_link = pmp_link; | |
469 | } | |
470 | ||
471 | for (i = 0; i < nr_ports; i++) { | |
472 | struct ata_link *link = &pmp_link[i]; | |
473 | struct ata_eh_context *ehc = &link->eh_context; | |
474 | ||
475 | link->flags = 0; | |
476 | ehc->i.probe_mask |= 1; | |
477 | ehc->i.action |= ATA_EH_SOFTRESET; | |
478 | ehc->i.flags |= ATA_EHI_RESUME_LINK; | |
479 | } | |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
484 | static void sata_pmp_quirks(struct ata_port *ap) | |
485 | { | |
486 | u32 *gscr = ap->link.device->gscr; | |
487 | u16 vendor = sata_pmp_gscr_vendor(gscr); | |
488 | u16 devid = sata_pmp_gscr_devid(gscr); | |
489 | struct ata_link *link; | |
490 | ||
491 | if (vendor == 0x1095 && devid == 0x3726) { | |
492 | /* sil3726 quirks */ | |
493 | ata_port_for_each_link(link, ap) { | |
494 | /* SError.N need a kick in the ass to get working */ | |
495 | link->flags |= ATA_LFLAG_HRST_TO_RESUME; | |
496 | ||
497 | /* class code report is unreliable */ | |
498 | if (link->pmp < 5) | |
499 | link->flags |= ATA_LFLAG_ASSUME_ATA; | |
500 | ||
501 | /* port 5 is for SEMB device and it doesn't like SRST */ | |
502 | if (link->pmp == 5) | |
503 | link->flags |= ATA_LFLAG_NO_SRST | | |
504 | ATA_LFLAG_ASSUME_SEMB; | |
505 | } | |
506 | } else if (vendor == 0x1095 && devid == 0x4723) { | |
507 | /* sil4723 quirks */ | |
508 | ata_port_for_each_link(link, ap) { | |
509 | /* SError.N need a kick in the ass to get working */ | |
510 | link->flags |= ATA_LFLAG_HRST_TO_RESUME; | |
511 | ||
512 | /* class code report is unreliable */ | |
513 | if (link->pmp < 2) | |
514 | link->flags |= ATA_LFLAG_ASSUME_ATA; | |
515 | ||
516 | /* the config device at port 2 locks up on SRST */ | |
517 | if (link->pmp == 2) | |
518 | link->flags |= ATA_LFLAG_NO_SRST | | |
519 | ATA_LFLAG_ASSUME_ATA; | |
520 | } | |
521 | } else if (vendor == 0x1095 && devid == 0x4726) { | |
522 | /* sil4726 quirks */ | |
523 | ata_port_for_each_link(link, ap) { | |
524 | /* SError.N need a kick in the ass to get working */ | |
525 | link->flags |= ATA_LFLAG_HRST_TO_RESUME; | |
526 | ||
527 | /* class code report is unreliable */ | |
528 | if (link->pmp < 5) | |
529 | link->flags |= ATA_LFLAG_ASSUME_ATA; | |
530 | ||
531 | /* The config device, which can be either at | |
532 | * port 0 or 5, locks up on SRST. | |
533 | */ | |
534 | if (link->pmp == 0 || link->pmp == 5) | |
535 | link->flags |= ATA_LFLAG_NO_SRST | | |
536 | ATA_LFLAG_ASSUME_ATA; | |
537 | ||
538 | /* Port 6 is for SEMB device which doesn't | |
539 | * like SRST either. | |
540 | */ | |
541 | if (link->pmp == 6) | |
542 | link->flags |= ATA_LFLAG_NO_SRST | | |
543 | ATA_LFLAG_ASSUME_SEMB; | |
544 | } | |
545 | } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 || | |
546 | devid == 0x5734 || devid == 0x5744)) { | |
547 | /* sil5723/5744 quirks */ | |
548 | ||
549 | /* sil5723/5744 has either two or three downstream | |
550 | * ports depending on operation mode. The last port | |
551 | * is empty if any actual IO device is available or | |
552 | * occupied by a pseudo configuration device | |
553 | * otherwise. Don't try hard to recover it. | |
554 | */ | |
555 | ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY; | |
556 | } else if (vendor == 0x11ab && devid == 0x4140) { | |
557 | /* Marvell 88SM4140 quirks. Fan-out ports require PHY | |
558 | * reset to work; other than that, it behaves very | |
559 | * nicely. | |
560 | */ | |
561 | ata_port_for_each_link(link, ap) | |
562 | link->flags |= ATA_LFLAG_HRST_TO_RESUME; | |
563 | } | |
564 | } | |
565 | ||
566 | /** | |
567 | * sata_pmp_attach - attach a SATA PMP device | |
568 | * @dev: SATA PMP device to attach | |
569 | * | |
570 | * Configure and attach SATA PMP device @dev. This function is | |
571 | * also responsible for allocating and initializing PMP links. | |
572 | * | |
573 | * LOCKING: | |
574 | * Kernel thread context (may sleep). | |
575 | * | |
576 | * RETURNS: | |
577 | * 0 on success, -errno on failure. | |
578 | */ | |
579 | int sata_pmp_attach(struct ata_device *dev) | |
580 | { | |
581 | struct ata_link *link = dev->link; | |
582 | struct ata_port *ap = link->ap; | |
583 | unsigned long flags; | |
584 | struct ata_link *tlink; | |
585 | int rc; | |
586 | ||
587 | /* is it hanging off the right place? */ | |
588 | if (!(ap->flags & ATA_FLAG_PMP)) { | |
589 | ata_dev_printk(dev, KERN_ERR, | |
590 | "host does not support Port Multiplier\n"); | |
591 | return -EINVAL; | |
592 | } | |
593 | ||
594 | if (!ata_is_host_link(link)) { | |
595 | ata_dev_printk(dev, KERN_ERR, | |
596 | "Port Multipliers cannot be nested\n"); | |
597 | return -EINVAL; | |
598 | } | |
599 | ||
600 | if (dev->devno) { | |
601 | ata_dev_printk(dev, KERN_ERR, | |
602 | "Port Multiplier must be the first device\n"); | |
603 | return -EINVAL; | |
604 | } | |
605 | ||
606 | WARN_ON(link->pmp != 0); | |
607 | link->pmp = SATA_PMP_CTRL_PORT; | |
608 | ||
609 | /* read GSCR block */ | |
610 | rc = sata_pmp_read_gscr(dev, dev->gscr); | |
611 | if (rc) | |
612 | goto fail; | |
613 | ||
614 | /* config PMP */ | |
615 | rc = sata_pmp_configure(dev, 1); | |
616 | if (rc) | |
617 | goto fail; | |
618 | ||
619 | rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr)); | |
620 | if (rc) { | |
621 | ata_dev_printk(dev, KERN_INFO, | |
622 | "failed to initialize PMP links\n"); | |
623 | goto fail; | |
624 | } | |
625 | ||
626 | /* attach it */ | |
627 | spin_lock_irqsave(ap->lock, flags); | |
628 | WARN_ON(ap->nr_pmp_links); | |
629 | ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr); | |
630 | spin_unlock_irqrestore(ap->lock, flags); | |
631 | ||
632 | sata_pmp_quirks(ap); | |
633 | ||
634 | if (ap->ops->pmp_attach) | |
635 | ap->ops->pmp_attach(ap); | |
636 | ||
637 | ata_port_for_each_link(tlink, ap) | |
638 | sata_link_init_spd(tlink); | |
639 | ||
d0df8b5d TH |
640 | ata_acpi_associate_sata_port(ap); |
641 | ||
3af9a77a TH |
642 | return 0; |
643 | ||
644 | fail: | |
645 | link->pmp = 0; | |
646 | return rc; | |
647 | } | |
648 | ||
649 | /** | |
650 | * sata_pmp_detach - detach a SATA PMP device | |
651 | * @dev: SATA PMP device to detach | |
652 | * | |
653 | * Detach SATA PMP device @dev. This function is also | |
654 | * responsible for deconfiguring PMP links. | |
655 | * | |
656 | * LOCKING: | |
657 | * Kernel thread context (may sleep). | |
658 | */ | |
659 | static void sata_pmp_detach(struct ata_device *dev) | |
660 | { | |
661 | struct ata_link *link = dev->link; | |
662 | struct ata_port *ap = link->ap; | |
663 | struct ata_link *tlink; | |
664 | unsigned long flags; | |
665 | ||
666 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier detaching\n"); | |
667 | ||
668 | WARN_ON(!ata_is_host_link(link) || dev->devno || | |
669 | link->pmp != SATA_PMP_CTRL_PORT); | |
670 | ||
671 | if (ap->ops->pmp_detach) | |
672 | ap->ops->pmp_detach(ap); | |
673 | ||
674 | ata_port_for_each_link(tlink, ap) | |
675 | ata_eh_detach_dev(tlink->device); | |
676 | ||
677 | spin_lock_irqsave(ap->lock, flags); | |
678 | ap->nr_pmp_links = 0; | |
679 | link->pmp = 0; | |
680 | spin_unlock_irqrestore(ap->lock, flags); | |
d0df8b5d TH |
681 | |
682 | ata_acpi_associate_sata_port(ap); | |
3af9a77a TH |
683 | } |
684 | ||
685 | /** | |
686 | * sata_pmp_same_pmp - does new GSCR matches the configured PMP? | |
687 | * @dev: PMP device to compare against | |
688 | * @new_gscr: GSCR block of the new device | |
689 | * | |
690 | * Compare @new_gscr against @dev and determine whether @dev is | |
691 | * the PMP described by @new_gscr. | |
692 | * | |
693 | * LOCKING: | |
694 | * None. | |
695 | * | |
696 | * RETURNS: | |
697 | * 1 if @dev matches @new_gscr, 0 otherwise. | |
698 | */ | |
699 | static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr) | |
700 | { | |
701 | const u32 *old_gscr = dev->gscr; | |
702 | u16 old_vendor, new_vendor, old_devid, new_devid; | |
703 | int old_nr_ports, new_nr_ports; | |
704 | ||
705 | old_vendor = sata_pmp_gscr_vendor(old_gscr); | |
706 | new_vendor = sata_pmp_gscr_vendor(new_gscr); | |
707 | old_devid = sata_pmp_gscr_devid(old_gscr); | |
708 | new_devid = sata_pmp_gscr_devid(new_gscr); | |
709 | old_nr_ports = sata_pmp_gscr_ports(old_gscr); | |
710 | new_nr_ports = sata_pmp_gscr_ports(new_gscr); | |
711 | ||
712 | if (old_vendor != new_vendor) { | |
713 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier " | |
714 | "vendor mismatch '0x%x' != '0x%x'\n", | |
715 | old_vendor, new_vendor); | |
716 | return 0; | |
717 | } | |
718 | ||
719 | if (old_devid != new_devid) { | |
720 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier " | |
721 | "device ID mismatch '0x%x' != '0x%x'\n", | |
722 | old_devid, new_devid); | |
723 | return 0; | |
724 | } | |
725 | ||
726 | if (old_nr_ports != new_nr_ports) { | |
727 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier " | |
728 | "nr_ports mismatch '0x%x' != '0x%x'\n", | |
729 | old_nr_ports, new_nr_ports); | |
730 | return 0; | |
731 | } | |
732 | ||
733 | return 1; | |
734 | } | |
735 | ||
736 | /** | |
737 | * sata_pmp_revalidate - revalidate SATA PMP | |
738 | * @dev: PMP device to revalidate | |
739 | * @new_class: new class code | |
740 | * | |
741 | * Re-read GSCR block and make sure @dev is still attached to the | |
742 | * port and properly configured. | |
743 | * | |
744 | * LOCKING: | |
745 | * Kernel thread context (may sleep). | |
746 | * | |
747 | * RETURNS: | |
748 | * 0 on success, -errno otherwise. | |
749 | */ | |
750 | static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class) | |
751 | { | |
752 | struct ata_link *link = dev->link; | |
753 | struct ata_port *ap = link->ap; | |
754 | u32 *gscr = (void *)ap->sector_buf; | |
755 | int rc; | |
756 | ||
757 | DPRINTK("ENTER\n"); | |
758 | ||
759 | ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE); | |
760 | ||
761 | if (!ata_dev_enabled(dev)) { | |
762 | rc = -ENODEV; | |
763 | goto fail; | |
764 | } | |
765 | ||
766 | /* wrong class? */ | |
767 | if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) { | |
768 | rc = -ENODEV; | |
769 | goto fail; | |
770 | } | |
771 | ||
772 | /* read GSCR */ | |
773 | rc = sata_pmp_read_gscr(dev, gscr); | |
774 | if (rc) | |
775 | goto fail; | |
776 | ||
777 | /* is the pmp still there? */ | |
778 | if (!sata_pmp_same_pmp(dev, gscr)) { | |
779 | rc = -ENODEV; | |
780 | goto fail; | |
781 | } | |
782 | ||
783 | memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS); | |
784 | ||
785 | rc = sata_pmp_configure(dev, 0); | |
786 | if (rc) | |
787 | goto fail; | |
788 | ||
789 | ata_eh_done(link, NULL, ATA_EH_REVALIDATE); | |
790 | ||
791 | DPRINTK("EXIT, rc=0\n"); | |
792 | return 0; | |
793 | ||
794 | fail: | |
795 | ata_dev_printk(dev, KERN_ERR, | |
796 | "PMP revalidation failed (errno=%d)\n", rc); | |
797 | DPRINTK("EXIT, rc=%d\n", rc); | |
798 | return rc; | |
799 | } | |
800 | ||
801 | /** | |
802 | * sata_pmp_revalidate_quick - revalidate SATA PMP quickly | |
803 | * @dev: PMP device to revalidate | |
804 | * | |
805 | * Make sure the attached PMP is accessible. | |
806 | * | |
807 | * LOCKING: | |
808 | * Kernel thread context (may sleep). | |
809 | * | |
810 | * RETURNS: | |
811 | * 0 on success, -errno otherwise. | |
812 | */ | |
813 | static int sata_pmp_revalidate_quick(struct ata_device *dev) | |
814 | { | |
815 | u32 prod_id; | |
816 | int rc; | |
817 | ||
818 | rc = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id); | |
819 | if (rc) { | |
820 | ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID\n"); | |
821 | return rc; | |
822 | } | |
823 | ||
824 | if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) { | |
825 | ata_dev_printk(dev, KERN_ERR, "PMP product ID mismatch\n"); | |
826 | /* something weird is going on, request full PMP recovery */ | |
827 | return -EIO; | |
828 | } | |
829 | ||
830 | return 0; | |
831 | } | |
832 | ||
833 | /** | |
834 | * sata_pmp_eh_recover_pmp - recover PMP | |
835 | * @ap: ATA port PMP is attached to | |
836 | * @prereset: prereset method (can be NULL) | |
837 | * @softreset: softreset method | |
838 | * @hardreset: hardreset method | |
839 | * @postreset: postreset method (can be NULL) | |
840 | * | |
841 | * Recover PMP attached to @ap. Recovery procedure is somewhat | |
842 | * similar to that of ata_eh_recover() except that reset should | |
843 | * always be performed in hard->soft sequence and recovery | |
844 | * failure results in PMP detachment. | |
845 | * | |
846 | * LOCKING: | |
847 | * Kernel thread context (may sleep). | |
848 | * | |
849 | * RETURNS: | |
850 | * 0 on success, -errno on failure. | |
851 | */ | |
852 | static int sata_pmp_eh_recover_pmp(struct ata_port *ap, | |
853 | ata_prereset_fn_t prereset, ata_reset_fn_t softreset, | |
854 | ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) | |
855 | { | |
856 | struct ata_link *link = &ap->link; | |
857 | struct ata_eh_context *ehc = &link->eh_context; | |
858 | struct ata_device *dev = link->device; | |
859 | int tries = ATA_EH_PMP_TRIES; | |
860 | int detach = 0, rc = 0; | |
861 | int reval_failed = 0; | |
862 | ||
863 | DPRINTK("ENTER\n"); | |
864 | ||
865 | if (dev->flags & ATA_DFLAG_DETACH) { | |
866 | detach = 1; | |
867 | goto fail; | |
868 | } | |
869 | ||
870 | retry: | |
871 | ehc->classes[0] = ATA_DEV_UNKNOWN; | |
872 | ||
873 | if (ehc->i.action & ATA_EH_RESET_MASK) { | |
874 | struct ata_link *tlink; | |
875 | ||
876 | ata_eh_freeze_port(ap); | |
877 | ||
878 | /* reset */ | |
879 | ehc->i.action = ATA_EH_HARDRESET; | |
880 | rc = ata_eh_reset(link, 0, prereset, softreset, hardreset, | |
881 | postreset); | |
882 | if (rc) { | |
883 | ata_link_printk(link, KERN_ERR, | |
884 | "failed to reset PMP, giving up\n"); | |
885 | goto fail; | |
886 | } | |
887 | ||
888 | ata_eh_thaw_port(ap); | |
889 | ||
890 | /* PMP is reset, SErrors cannot be trusted, scan all */ | |
891 | ata_port_for_each_link(tlink, ap) | |
892 | ata_ehi_schedule_probe(&tlink->eh_context.i); | |
893 | } | |
894 | ||
895 | /* If revalidation is requested, revalidate and reconfigure; | |
896 | * otherwise, do quick revalidation. | |
897 | */ | |
898 | if (ehc->i.action & ATA_EH_REVALIDATE) | |
899 | rc = sata_pmp_revalidate(dev, ehc->classes[0]); | |
900 | else | |
901 | rc = sata_pmp_revalidate_quick(dev); | |
902 | ||
903 | if (rc) { | |
904 | tries--; | |
905 | ||
906 | if (rc == -ENODEV) { | |
907 | ehc->i.probe_mask |= 1; | |
908 | detach = 1; | |
909 | /* give it just two more chances */ | |
910 | tries = min(tries, 2); | |
911 | } | |
912 | ||
913 | if (tries) { | |
914 | int sleep = ehc->i.flags & ATA_EHI_DID_RESET; | |
915 | ||
916 | /* consecutive revalidation failures? speed down */ | |
917 | if (reval_failed) | |
918 | sata_down_spd_limit(link); | |
919 | else | |
920 | reval_failed = 1; | |
921 | ||
922 | ata_dev_printk(dev, KERN_WARNING, | |
923 | "retrying hardreset%s\n", | |
924 | sleep ? " in 5 secs" : ""); | |
925 | if (sleep) | |
926 | ssleep(5); | |
927 | ehc->i.action |= ATA_EH_HARDRESET; | |
928 | goto retry; | |
929 | } else { | |
930 | ata_dev_printk(dev, KERN_ERR, "failed to recover PMP " | |
931 | "after %d tries, giving up\n", | |
932 | ATA_EH_PMP_TRIES); | |
933 | goto fail; | |
934 | } | |
935 | } | |
936 | ||
937 | /* okay, PMP resurrected */ | |
938 | ehc->i.flags = 0; | |
939 | ||
940 | DPRINTK("EXIT, rc=0\n"); | |
941 | return 0; | |
942 | ||
943 | fail: | |
944 | sata_pmp_detach(dev); | |
945 | if (detach) | |
946 | ata_eh_detach_dev(dev); | |
947 | else | |
948 | ata_dev_disable(dev); | |
949 | ||
950 | DPRINTK("EXIT, rc=%d\n", rc); | |
951 | return rc; | |
952 | } | |
953 | ||
954 | static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap) | |
955 | { | |
956 | struct ata_link *link; | |
957 | unsigned long flags; | |
958 | int rc; | |
959 | ||
960 | spin_lock_irqsave(ap->lock, flags); | |
961 | ||
962 | ata_port_for_each_link(link, ap) { | |
963 | if (!(link->flags & ATA_LFLAG_DISABLED)) | |
964 | continue; | |
965 | ||
966 | spin_unlock_irqrestore(ap->lock, flags); | |
967 | ||
968 | /* Some PMPs require hardreset sequence to get | |
969 | * SError.N working. | |
970 | */ | |
971 | if ((link->flags & ATA_LFLAG_HRST_TO_RESUME) && | |
972 | (link->eh_context.i.flags & ATA_EHI_RESUME_LINK)) | |
973 | sata_link_hardreset(link, sata_deb_timing_normal, | |
974 | jiffies + ATA_TMOUT_INTERNAL_QUICK); | |
975 | ||
976 | /* unconditionally clear SError.N */ | |
977 | rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG); | |
978 | if (rc) { | |
979 | ata_link_printk(link, KERN_ERR, "failed to clear " | |
980 | "SError.N (errno=%d)\n", rc); | |
981 | return rc; | |
982 | } | |
983 | ||
984 | spin_lock_irqsave(ap->lock, flags); | |
985 | } | |
986 | ||
987 | spin_unlock_irqrestore(ap->lock, flags); | |
988 | ||
989 | return 0; | |
990 | } | |
991 | ||
992 | static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries) | |
993 | { | |
994 | struct ata_port *ap = link->ap; | |
995 | unsigned long flags; | |
996 | ||
997 | if (link_tries[link->pmp] && --link_tries[link->pmp]) | |
998 | return 1; | |
999 | ||
1000 | /* disable this link */ | |
1001 | if (!(link->flags & ATA_LFLAG_DISABLED)) { | |
1002 | ata_link_printk(link, KERN_WARNING, | |
1003 | "failed to recover link after %d tries, disabling\n", | |
1004 | ATA_EH_PMP_LINK_TRIES); | |
1005 | ||
1006 | spin_lock_irqsave(ap->lock, flags); | |
1007 | link->flags |= ATA_LFLAG_DISABLED; | |
1008 | spin_unlock_irqrestore(ap->lock, flags); | |
1009 | } | |
1010 | ||
1011 | ata_dev_disable(link->device); | |
1012 | link->eh_context.i.action = 0; | |
1013 | ||
1014 | return 0; | |
1015 | } | |
1016 | ||
1017 | /** | |
1018 | * sata_pmp_eh_recover - recover PMP-enabled port | |
1019 | * @ap: ATA port to recover | |
1020 | * @prereset: prereset method (can be NULL) | |
1021 | * @softreset: softreset method | |
1022 | * @hardreset: hardreset method | |
1023 | * @postreset: postreset method (can be NULL) | |
1024 | * @pmp_prereset: PMP prereset method (can be NULL) | |
1025 | * @pmp_softreset: PMP softreset method (can be NULL) | |
1026 | * @pmp_hardreset: PMP hardreset method (can be NULL) | |
1027 | * @pmp_postreset: PMP postreset method (can be NULL) | |
1028 | * | |
1029 | * Drive EH recovery operation for PMP enabled port @ap. This | |
1030 | * function recovers host and PMP ports with proper retrials and | |
1031 | * fallbacks. Actual recovery operations are performed using | |
1032 | * ata_eh_recover() and sata_pmp_eh_recover_pmp(). | |
1033 | * | |
1034 | * LOCKING: | |
1035 | * Kernel thread context (may sleep). | |
1036 | * | |
1037 | * RETURNS: | |
1038 | * 0 on success, -errno on failure. | |
1039 | */ | |
1040 | static int sata_pmp_eh_recover(struct ata_port *ap, | |
1041 | ata_prereset_fn_t prereset, ata_reset_fn_t softreset, | |
1042 | ata_reset_fn_t hardreset, ata_postreset_fn_t postreset, | |
1043 | ata_prereset_fn_t pmp_prereset, ata_reset_fn_t pmp_softreset, | |
1044 | ata_reset_fn_t pmp_hardreset, ata_postreset_fn_t pmp_postreset) | |
1045 | { | |
1046 | int pmp_tries, link_tries[SATA_PMP_MAX_PORTS]; | |
1047 | struct ata_link *pmp_link = &ap->link; | |
1048 | struct ata_device *pmp_dev = pmp_link->device; | |
1049 | struct ata_eh_context *pmp_ehc = &pmp_link->eh_context; | |
1050 | struct ata_link *link; | |
1051 | struct ata_device *dev; | |
1052 | u32 gscr_error, sntf; | |
1053 | int cnt, rc; | |
1054 | ||
1055 | pmp_tries = ATA_EH_PMP_TRIES; | |
1056 | ata_port_for_each_link(link, ap) | |
1057 | link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; | |
1058 | ||
1059 | retry: | |
1060 | /* PMP attached? */ | |
1061 | if (!ap->nr_pmp_links) { | |
1062 | rc = ata_eh_recover(ap, prereset, softreset, hardreset, | |
1063 | postreset, NULL); | |
1064 | if (rc) { | |
1065 | ata_link_for_each_dev(dev, &ap->link) | |
1066 | ata_dev_disable(dev); | |
1067 | return rc; | |
1068 | } | |
1069 | ||
1070 | if (pmp_dev->class != ATA_DEV_PMP) | |
1071 | return 0; | |
1072 | ||
1073 | /* new PMP online */ | |
1074 | ata_port_for_each_link(link, ap) | |
1075 | link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; | |
1076 | ||
1077 | /* fall through */ | |
1078 | } | |
1079 | ||
1080 | /* recover pmp */ | |
1081 | rc = sata_pmp_eh_recover_pmp(ap, prereset, softreset, hardreset, | |
1082 | postreset); | |
1083 | if (rc) | |
1084 | goto pmp_fail; | |
1085 | ||
1086 | /* handle disabled links */ | |
1087 | rc = sata_pmp_eh_handle_disabled_links(ap); | |
1088 | if (rc) | |
1089 | goto pmp_fail; | |
1090 | ||
1091 | /* recover links */ | |
1092 | rc = ata_eh_recover(ap, pmp_prereset, pmp_softreset, pmp_hardreset, | |
1093 | pmp_postreset, &link); | |
1094 | if (rc) | |
1095 | goto link_fail; | |
1096 | ||
1097 | /* Connection status might have changed while resetting other | |
1098 | * links, check SATA_PMP_GSCR_ERROR before returning. | |
1099 | */ | |
1100 | ||
1101 | /* clear SNotification */ | |
1102 | rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf); | |
1103 | if (rc == 0) | |
1104 | sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf); | |
1105 | ||
1106 | /* enable notification */ | |
1107 | if (pmp_dev->flags & ATA_DFLAG_AN) { | |
1108 | pmp_dev->gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY; | |
1109 | ||
1110 | rc = sata_pmp_write(pmp_dev->link, SATA_PMP_GSCR_FEAT_EN, | |
1111 | pmp_dev->gscr[SATA_PMP_GSCR_FEAT_EN]); | |
1112 | if (rc) { | |
1113 | ata_dev_printk(pmp_dev, KERN_ERR, | |
1114 | "failed to write PMP_FEAT_EN\n"); | |
1115 | goto pmp_fail; | |
1116 | } | |
1117 | } | |
1118 | ||
1119 | /* check GSCR_ERROR */ | |
1120 | rc = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error); | |
1121 | if (rc) { | |
1122 | ata_dev_printk(pmp_dev, KERN_ERR, | |
1123 | "failed to read PMP_GSCR_ERROR\n"); | |
1124 | goto pmp_fail; | |
1125 | } | |
1126 | ||
1127 | cnt = 0; | |
1128 | ata_port_for_each_link(link, ap) { | |
1129 | if (!(gscr_error & (1 << link->pmp))) | |
1130 | continue; | |
1131 | ||
1132 | if (sata_pmp_handle_link_fail(link, link_tries)) { | |
1133 | ata_ehi_hotplugged(&link->eh_context.i); | |
1134 | cnt++; | |
1135 | } else { | |
1136 | ata_link_printk(link, KERN_WARNING, | |
1137 | "PHY status changed but maxed out on retries, " | |
1138 | "giving up\n"); | |
1139 | ata_link_printk(link, KERN_WARNING, | |
1140 | "Manully issue scan to resume this link\n"); | |
1141 | } | |
1142 | } | |
1143 | ||
1144 | if (cnt) { | |
1145 | ata_port_printk(ap, KERN_INFO, "PMP SError.N set for some " | |
1146 | "ports, repeating recovery\n"); | |
1147 | goto retry; | |
1148 | } | |
1149 | ||
1150 | return 0; | |
1151 | ||
1152 | link_fail: | |
1153 | if (sata_pmp_handle_link_fail(link, link_tries)) { | |
1154 | pmp_ehc->i.action |= ATA_EH_HARDRESET; | |
1155 | goto retry; | |
1156 | } | |
1157 | ||
1158 | /* fall through */ | |
1159 | pmp_fail: | |
1160 | /* Control always ends up here after detaching PMP. Shut up | |
1161 | * and return if we're unloading. | |
1162 | */ | |
1163 | if (ap->pflags & ATA_PFLAG_UNLOADING) | |
1164 | return rc; | |
1165 | ||
1166 | if (!ap->nr_pmp_links) | |
1167 | goto retry; | |
1168 | ||
1169 | if (--pmp_tries) { | |
1170 | ata_port_printk(ap, KERN_WARNING, | |
1171 | "failed to recover PMP, retrying in 5 secs\n"); | |
1172 | pmp_ehc->i.action |= ATA_EH_HARDRESET; | |
1173 | ssleep(5); | |
1174 | goto retry; | |
1175 | } | |
1176 | ||
1177 | ata_port_printk(ap, KERN_ERR, | |
1178 | "failed to recover PMP after %d tries, giving up\n", | |
1179 | ATA_EH_PMP_TRIES); | |
1180 | sata_pmp_detach(pmp_dev); | |
1181 | ata_dev_disable(pmp_dev); | |
1182 | ||
1183 | return rc; | |
1184 | } | |
1185 | ||
1186 | /** | |
1187 | * sata_pmp_do_eh - do standard error handling for PMP-enabled host | |
1188 | * @ap: host port to handle error for | |
1189 | * @prereset: prereset method (can be NULL) | |
1190 | * @softreset: softreset method | |
1191 | * @hardreset: hardreset method | |
1192 | * @postreset: postreset method (can be NULL) | |
1193 | * @pmp_prereset: PMP prereset method (can be NULL) | |
1194 | * @pmp_softreset: PMP softreset method (can be NULL) | |
1195 | * @pmp_hardreset: PMP hardreset method (can be NULL) | |
1196 | * @pmp_postreset: PMP postreset method (can be NULL) | |
1197 | * | |
1198 | * Perform standard error handling sequence for PMP-enabled host | |
1199 | * @ap. | |
1200 | * | |
1201 | * LOCKING: | |
1202 | * Kernel thread context (may sleep). | |
1203 | */ | |
1204 | void sata_pmp_do_eh(struct ata_port *ap, | |
1205 | ata_prereset_fn_t prereset, ata_reset_fn_t softreset, | |
1206 | ata_reset_fn_t hardreset, ata_postreset_fn_t postreset, | |
1207 | ata_prereset_fn_t pmp_prereset, ata_reset_fn_t pmp_softreset, | |
1208 | ata_reset_fn_t pmp_hardreset, ata_postreset_fn_t pmp_postreset) | |
1209 | { | |
1210 | ata_eh_autopsy(ap); | |
1211 | ata_eh_report(ap); | |
1212 | sata_pmp_eh_recover(ap, prereset, softreset, hardreset, postreset, | |
1213 | pmp_prereset, pmp_softreset, pmp_hardreset, | |
1214 | pmp_postreset); | |
1215 | ata_eh_finish(ap); | |
1216 | } |