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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 <linux/slab.h> | |
13 | #include "libata.h" | |
14 | #include "libata-transport.h" | |
15 | ||
16 | const struct ata_port_operations sata_pmp_port_ops = { | |
17 | .inherits = &sata_port_ops, | |
18 | .pmp_prereset = ata_std_prereset, | |
19 | .pmp_hardreset = sata_std_hardreset, | |
20 | .pmp_postreset = ata_std_postreset, | |
21 | .error_handler = sata_pmp_error_handler, | |
22 | }; | |
23 | ||
24 | /** | |
25 | * sata_pmp_read - read PMP register | |
26 | * @link: link to read PMP register for | |
27 | * @reg: register to read | |
28 | * @r_val: resulting value | |
29 | * | |
30 | * Read PMP register. | |
31 | * | |
32 | * LOCKING: | |
33 | * Kernel thread context (may sleep). | |
34 | * | |
35 | * RETURNS: | |
36 | * 0 on success, AC_ERR_* mask on failure. | |
37 | */ | |
38 | static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val) | |
39 | { | |
40 | struct ata_port *ap = link->ap; | |
41 | struct ata_device *pmp_dev = ap->link.device; | |
42 | struct ata_taskfile tf; | |
43 | unsigned int err_mask; | |
44 | ||
45 | ata_tf_init(pmp_dev, &tf); | |
46 | tf.command = ATA_CMD_PMP_READ; | |
47 | tf.protocol = ATA_PROT_NODATA; | |
48 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; | |
49 | tf.feature = reg; | |
50 | tf.device = link->pmp; | |
51 | ||
52 | err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0, | |
53 | SATA_PMP_RW_TIMEOUT); | |
54 | if (err_mask) | |
55 | return err_mask; | |
56 | ||
57 | *r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24; | |
58 | return 0; | |
59 | } | |
60 | ||
61 | /** | |
62 | * sata_pmp_write - write PMP register | |
63 | * @link: link to write PMP register for | |
64 | * @reg: register to write | |
65 | * @r_val: value to write | |
66 | * | |
67 | * Write PMP register. | |
68 | * | |
69 | * LOCKING: | |
70 | * Kernel thread context (may sleep). | |
71 | * | |
72 | * RETURNS: | |
73 | * 0 on success, AC_ERR_* mask on failure. | |
74 | */ | |
75 | static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val) | |
76 | { | |
77 | struct ata_port *ap = link->ap; | |
78 | struct ata_device *pmp_dev = ap->link.device; | |
79 | struct ata_taskfile tf; | |
80 | ||
81 | ata_tf_init(pmp_dev, &tf); | |
82 | tf.command = ATA_CMD_PMP_WRITE; | |
83 | tf.protocol = ATA_PROT_NODATA; | |
84 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; | |
85 | tf.feature = reg; | |
86 | tf.device = link->pmp; | |
87 | tf.nsect = val & 0xff; | |
88 | tf.lbal = (val >> 8) & 0xff; | |
89 | tf.lbam = (val >> 16) & 0xff; | |
90 | tf.lbah = (val >> 24) & 0xff; | |
91 | ||
92 | return ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0, | |
93 | SATA_PMP_RW_TIMEOUT); | |
94 | } | |
95 | ||
96 | /** | |
97 | * sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP | |
98 | * @qc: ATA command in question | |
99 | * | |
100 | * A host which has command switching PMP support cannot issue | |
101 | * commands to multiple links simultaneously. | |
102 | * | |
103 | * LOCKING: | |
104 | * spin_lock_irqsave(host lock) | |
105 | * | |
106 | * RETURNS: | |
107 | * ATA_DEFER_* if deferring is needed, 0 otherwise. | |
108 | */ | |
109 | int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc) | |
110 | { | |
111 | struct ata_link *link = qc->dev->link; | |
112 | struct ata_port *ap = link->ap; | |
113 | ||
114 | if (ap->excl_link == NULL || ap->excl_link == link) { | |
115 | if (ap->nr_active_links == 0 || ata_link_active(link)) { | |
116 | qc->flags |= ATA_QCFLAG_CLEAR_EXCL; | |
117 | return ata_std_qc_defer(qc); | |
118 | } | |
119 | ||
120 | ap->excl_link = link; | |
121 | } | |
122 | ||
123 | return ATA_DEFER_PORT; | |
124 | } | |
125 | ||
126 | /** | |
127 | * sata_pmp_scr_read - read PSCR | |
128 | * @link: ATA link to read PSCR for | |
129 | * @reg: PSCR to read | |
130 | * @r_val: resulting value | |
131 | * | |
132 | * Read PSCR @reg into @r_val for @link, to be called from | |
133 | * ata_scr_read(). | |
134 | * | |
135 | * LOCKING: | |
136 | * Kernel thread context (may sleep). | |
137 | * | |
138 | * RETURNS: | |
139 | * 0 on success, -errno on failure. | |
140 | */ | |
141 | int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val) | |
142 | { | |
143 | unsigned int err_mask; | |
144 | ||
145 | if (reg > SATA_PMP_PSCR_CONTROL) | |
146 | return -EINVAL; | |
147 | ||
148 | err_mask = sata_pmp_read(link, reg, r_val); | |
149 | if (err_mask) { | |
150 | ata_link_printk(link, KERN_WARNING, "failed to read SCR %d " | |
151 | "(Emask=0x%x)\n", reg, err_mask); | |
152 | return -EIO; | |
153 | } | |
154 | return 0; | |
155 | } | |
156 | ||
157 | /** | |
158 | * sata_pmp_scr_write - write PSCR | |
159 | * @link: ATA link to write PSCR for | |
160 | * @reg: PSCR to write | |
161 | * @val: value to be written | |
162 | * | |
163 | * Write @val to PSCR @reg for @link, to be called from | |
164 | * ata_scr_write() and ata_scr_write_flush(). | |
165 | * | |
166 | * LOCKING: | |
167 | * Kernel thread context (may sleep). | |
168 | * | |
169 | * RETURNS: | |
170 | * 0 on success, -errno on failure. | |
171 | */ | |
172 | int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val) | |
173 | { | |
174 | unsigned int err_mask; | |
175 | ||
176 | if (reg > SATA_PMP_PSCR_CONTROL) | |
177 | return -EINVAL; | |
178 | ||
179 | err_mask = sata_pmp_write(link, reg, val); | |
180 | if (err_mask) { | |
181 | ata_link_printk(link, KERN_WARNING, "failed to write SCR %d " | |
182 | "(Emask=0x%x)\n", reg, err_mask); | |
183 | return -EIO; | |
184 | } | |
185 | return 0; | |
186 | } | |
187 | ||
188 | /** | |
189 | * sata_pmp_read_gscr - read GSCR block of SATA PMP | |
190 | * @dev: PMP device | |
191 | * @gscr: buffer to read GSCR block into | |
192 | * | |
193 | * Read selected PMP GSCRs from the PMP at @dev. This will serve | |
194 | * as configuration and identification info for the PMP. | |
195 | * | |
196 | * LOCKING: | |
197 | * Kernel thread context (may sleep). | |
198 | * | |
199 | * RETURNS: | |
200 | * 0 on success, -errno on failure. | |
201 | */ | |
202 | static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr) | |
203 | { | |
204 | static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 }; | |
205 | int i; | |
206 | ||
207 | for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) { | |
208 | int reg = gscr_to_read[i]; | |
209 | unsigned int err_mask; | |
210 | ||
211 | err_mask = sata_pmp_read(dev->link, reg, &gscr[reg]); | |
212 | if (err_mask) { | |
213 | ata_dev_printk(dev, KERN_ERR, "failed to read PMP " | |
214 | "GSCR[%d] (Emask=0x%x)\n", reg, err_mask); | |
215 | return -EIO; | |
216 | } | |
217 | } | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | static const char *sata_pmp_spec_rev_str(const u32 *gscr) | |
223 | { | |
224 | u32 rev = gscr[SATA_PMP_GSCR_REV]; | |
225 | ||
226 | if (rev & (1 << 3)) | |
227 | return "1.2"; | |
228 | if (rev & (1 << 2)) | |
229 | return "1.1"; | |
230 | if (rev & (1 << 1)) | |
231 | return "1.0"; | |
232 | return "<unknown>"; | |
233 | } | |
234 | ||
235 | #define PMP_GSCR_SII_POL 129 | |
236 | ||
237 | static int sata_pmp_configure(struct ata_device *dev, int print_info) | |
238 | { | |
239 | struct ata_port *ap = dev->link->ap; | |
240 | u32 *gscr = dev->gscr; | |
241 | u16 vendor = sata_pmp_gscr_vendor(gscr); | |
242 | u16 devid = sata_pmp_gscr_devid(gscr); | |
243 | unsigned int err_mask = 0; | |
244 | const char *reason; | |
245 | int nr_ports, rc; | |
246 | ||
247 | nr_ports = sata_pmp_gscr_ports(gscr); | |
248 | ||
249 | if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) { | |
250 | rc = -EINVAL; | |
251 | reason = "invalid nr_ports"; | |
252 | goto fail; | |
253 | } | |
254 | ||
255 | if ((ap->flags & ATA_FLAG_AN) && | |
256 | (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY)) | |
257 | dev->flags |= ATA_DFLAG_AN; | |
258 | ||
259 | /* monitor SERR_PHYRDY_CHG on fan-out ports */ | |
260 | err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN, | |
261 | SERR_PHYRDY_CHG); | |
262 | if (err_mask) { | |
263 | rc = -EIO; | |
264 | reason = "failed to write GSCR_ERROR_EN"; | |
265 | goto fail; | |
266 | } | |
267 | ||
268 | /* Disable sending Early R_OK. | |
269 | * With "cached read" HDD testing and multiple ports busy on a SATA | |
270 | * host controller, 3726 PMP will very rarely drop a deferred | |
271 | * R_OK that was intended for the host. Symptom will be all | |
272 | * 5 drives under test will timeout, get reset, and recover. | |
273 | */ | |
274 | if (vendor == 0x1095 && devid == 0x3726) { | |
275 | u32 reg; | |
276 | ||
277 | err_mask = sata_pmp_read(&ap->link, PMP_GSCR_SII_POL, ®); | |
278 | if (err_mask) { | |
279 | rc = -EIO; | |
280 | reason = "failed to read Sil3726 Private Register"; | |
281 | goto fail; | |
282 | } | |
283 | reg &= ~0x1; | |
284 | err_mask = sata_pmp_write(&ap->link, PMP_GSCR_SII_POL, reg); | |
285 | if (err_mask) { | |
286 | rc = -EIO; | |
287 | reason = "failed to write Sil3726 Private Register"; | |
288 | goto fail; | |
289 | } | |
290 | } | |
291 | ||
292 | if (print_info) { | |
293 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier %s, " | |
294 | "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n", | |
295 | sata_pmp_spec_rev_str(gscr), vendor, devid, | |
296 | sata_pmp_gscr_rev(gscr), | |
297 | nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN], | |
298 | gscr[SATA_PMP_GSCR_FEAT]); | |
299 | ||
300 | if (!(dev->flags & ATA_DFLAG_AN)) | |
301 | ata_dev_printk(dev, KERN_INFO, | |
302 | "Asynchronous notification not supported, " | |
303 | "hotplug won't\n work on fan-out " | |
304 | "ports. Use warm-plug instead.\n"); | |
305 | } | |
306 | ||
307 | return 0; | |
308 | ||
309 | fail: | |
310 | ata_dev_printk(dev, KERN_ERR, | |
311 | "failed to configure Port Multiplier (%s, Emask=0x%x)\n", | |
312 | reason, err_mask); | |
313 | return rc; | |
314 | } | |
315 | ||
316 | static int sata_pmp_init_links (struct ata_port *ap, int nr_ports) | |
317 | { | |
318 | struct ata_link *pmp_link = ap->pmp_link; | |
319 | int i, err; | |
320 | ||
321 | if (!pmp_link) { | |
322 | pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS, | |
323 | GFP_NOIO); | |
324 | if (!pmp_link) | |
325 | return -ENOMEM; | |
326 | ||
327 | for (i = 0; i < SATA_PMP_MAX_PORTS; i++) | |
328 | ata_link_init(ap, &pmp_link[i], i); | |
329 | ||
330 | ap->pmp_link = pmp_link; | |
331 | ||
332 | for (i = 0; i < SATA_PMP_MAX_PORTS; i++) { | |
333 | err = ata_tlink_add(&pmp_link[i]); | |
334 | if (err) { | |
335 | goto err_tlink; | |
336 | } | |
337 | } | |
338 | } | |
339 | ||
340 | for (i = 0; i < nr_ports; i++) { | |
341 | struct ata_link *link = &pmp_link[i]; | |
342 | struct ata_eh_context *ehc = &link->eh_context; | |
343 | ||
344 | link->flags = 0; | |
345 | ehc->i.probe_mask |= ATA_ALL_DEVICES; | |
346 | ehc->i.action |= ATA_EH_RESET; | |
347 | } | |
348 | ||
349 | return 0; | |
350 | err_tlink: | |
351 | while (--i >= 0) | |
352 | ata_tlink_delete(&pmp_link[i]); | |
353 | kfree(pmp_link); | |
354 | ap->pmp_link = NULL; | |
355 | return err; | |
356 | } | |
357 | ||
358 | static void sata_pmp_quirks(struct ata_port *ap) | |
359 | { | |
360 | u32 *gscr = ap->link.device->gscr; | |
361 | u16 vendor = sata_pmp_gscr_vendor(gscr); | |
362 | u16 devid = sata_pmp_gscr_devid(gscr); | |
363 | struct ata_link *link; | |
364 | ||
365 | if (vendor == 0x1095 && devid == 0x3726) { | |
366 | /* sil3726 quirks */ | |
367 | ata_for_each_link(link, ap, EDGE) { | |
368 | /* Class code report is unreliable and SRST | |
369 | * times out under certain configurations. | |
370 | */ | |
371 | if (link->pmp < 5) | |
372 | link->flags |= ATA_LFLAG_NO_SRST | | |
373 | ATA_LFLAG_ASSUME_ATA; | |
374 | ||
375 | /* port 5 is for SEMB device and it doesn't like SRST */ | |
376 | if (link->pmp == 5) | |
377 | link->flags |= ATA_LFLAG_NO_SRST | | |
378 | ATA_LFLAG_ASSUME_SEMB; | |
379 | } | |
380 | } else if (vendor == 0x1095 && devid == 0x4723) { | |
381 | /* sil4723 quirks */ | |
382 | ata_for_each_link(link, ap, EDGE) { | |
383 | /* class code report is unreliable */ | |
384 | if (link->pmp < 2) | |
385 | link->flags |= ATA_LFLAG_ASSUME_ATA; | |
386 | ||
387 | /* the config device at port 2 locks up on SRST */ | |
388 | if (link->pmp == 2) | |
389 | link->flags |= ATA_LFLAG_NO_SRST | | |
390 | ATA_LFLAG_ASSUME_ATA; | |
391 | } | |
392 | } else if (vendor == 0x1095 && devid == 0x4726) { | |
393 | /* sil4726 quirks */ | |
394 | ata_for_each_link(link, ap, EDGE) { | |
395 | /* Class code report is unreliable and SRST | |
396 | * times out under certain configurations. | |
397 | * Config device can be at port 0 or 5 and | |
398 | * locks up on SRST. | |
399 | */ | |
400 | if (link->pmp <= 5) | |
401 | link->flags |= ATA_LFLAG_NO_SRST | | |
402 | ATA_LFLAG_ASSUME_ATA; | |
403 | ||
404 | /* Port 6 is for SEMB device which doesn't | |
405 | * like SRST either. | |
406 | */ | |
407 | if (link->pmp == 6) | |
408 | link->flags |= ATA_LFLAG_NO_SRST | | |
409 | ATA_LFLAG_ASSUME_SEMB; | |
410 | } | |
411 | } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 || | |
412 | devid == 0x5734 || devid == 0x5744)) { | |
413 | /* sil5723/5744 quirks */ | |
414 | ||
415 | /* sil5723/5744 has either two or three downstream | |
416 | * ports depending on operation mode. The last port | |
417 | * is empty if any actual IO device is available or | |
418 | * occupied by a pseudo configuration device | |
419 | * otherwise. Don't try hard to recover it. | |
420 | */ | |
421 | ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY; | |
422 | } | |
423 | } | |
424 | ||
425 | /** | |
426 | * sata_pmp_attach - attach a SATA PMP device | |
427 | * @dev: SATA PMP device to attach | |
428 | * | |
429 | * Configure and attach SATA PMP device @dev. This function is | |
430 | * also responsible for allocating and initializing PMP links. | |
431 | * | |
432 | * LOCKING: | |
433 | * Kernel thread context (may sleep). | |
434 | * | |
435 | * RETURNS: | |
436 | * 0 on success, -errno on failure. | |
437 | */ | |
438 | int sata_pmp_attach(struct ata_device *dev) | |
439 | { | |
440 | struct ata_link *link = dev->link; | |
441 | struct ata_port *ap = link->ap; | |
442 | unsigned long flags; | |
443 | struct ata_link *tlink; | |
444 | int rc; | |
445 | ||
446 | /* is it hanging off the right place? */ | |
447 | if (!sata_pmp_supported(ap)) { | |
448 | ata_dev_printk(dev, KERN_ERR, | |
449 | "host does not support Port Multiplier\n"); | |
450 | return -EINVAL; | |
451 | } | |
452 | ||
453 | if (!ata_is_host_link(link)) { | |
454 | ata_dev_printk(dev, KERN_ERR, | |
455 | "Port Multipliers cannot be nested\n"); | |
456 | return -EINVAL; | |
457 | } | |
458 | ||
459 | if (dev->devno) { | |
460 | ata_dev_printk(dev, KERN_ERR, | |
461 | "Port Multiplier must be the first device\n"); | |
462 | return -EINVAL; | |
463 | } | |
464 | ||
465 | WARN_ON(link->pmp != 0); | |
466 | link->pmp = SATA_PMP_CTRL_PORT; | |
467 | ||
468 | /* read GSCR block */ | |
469 | rc = sata_pmp_read_gscr(dev, dev->gscr); | |
470 | if (rc) | |
471 | goto fail; | |
472 | ||
473 | /* config PMP */ | |
474 | rc = sata_pmp_configure(dev, 1); | |
475 | if (rc) | |
476 | goto fail; | |
477 | ||
478 | rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr)); | |
479 | if (rc) { | |
480 | ata_dev_printk(dev, KERN_INFO, | |
481 | "failed to initialize PMP links\n"); | |
482 | goto fail; | |
483 | } | |
484 | ||
485 | /* attach it */ | |
486 | spin_lock_irqsave(ap->lock, flags); | |
487 | WARN_ON(ap->nr_pmp_links); | |
488 | ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr); | |
489 | spin_unlock_irqrestore(ap->lock, flags); | |
490 | ||
491 | sata_pmp_quirks(ap); | |
492 | ||
493 | if (ap->ops->pmp_attach) | |
494 | ap->ops->pmp_attach(ap); | |
495 | ||
496 | ata_for_each_link(tlink, ap, EDGE) | |
497 | sata_link_init_spd(tlink); | |
498 | ||
499 | ata_acpi_associate_sata_port(ap); | |
500 | ||
501 | return 0; | |
502 | ||
503 | fail: | |
504 | link->pmp = 0; | |
505 | return rc; | |
506 | } | |
507 | ||
508 | /** | |
509 | * sata_pmp_detach - detach a SATA PMP device | |
510 | * @dev: SATA PMP device to detach | |
511 | * | |
512 | * Detach SATA PMP device @dev. This function is also | |
513 | * responsible for deconfiguring PMP links. | |
514 | * | |
515 | * LOCKING: | |
516 | * Kernel thread context (may sleep). | |
517 | */ | |
518 | static void sata_pmp_detach(struct ata_device *dev) | |
519 | { | |
520 | struct ata_link *link = dev->link; | |
521 | struct ata_port *ap = link->ap; | |
522 | struct ata_link *tlink; | |
523 | unsigned long flags; | |
524 | ||
525 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier detaching\n"); | |
526 | ||
527 | WARN_ON(!ata_is_host_link(link) || dev->devno || | |
528 | link->pmp != SATA_PMP_CTRL_PORT); | |
529 | ||
530 | if (ap->ops->pmp_detach) | |
531 | ap->ops->pmp_detach(ap); | |
532 | ||
533 | ata_for_each_link(tlink, ap, EDGE) | |
534 | ata_eh_detach_dev(tlink->device); | |
535 | ||
536 | spin_lock_irqsave(ap->lock, flags); | |
537 | ap->nr_pmp_links = 0; | |
538 | link->pmp = 0; | |
539 | spin_unlock_irqrestore(ap->lock, flags); | |
540 | ||
541 | ata_acpi_associate_sata_port(ap); | |
542 | } | |
543 | ||
544 | /** | |
545 | * sata_pmp_same_pmp - does new GSCR matches the configured PMP? | |
546 | * @dev: PMP device to compare against | |
547 | * @new_gscr: GSCR block of the new device | |
548 | * | |
549 | * Compare @new_gscr against @dev and determine whether @dev is | |
550 | * the PMP described by @new_gscr. | |
551 | * | |
552 | * LOCKING: | |
553 | * None. | |
554 | * | |
555 | * RETURNS: | |
556 | * 1 if @dev matches @new_gscr, 0 otherwise. | |
557 | */ | |
558 | static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr) | |
559 | { | |
560 | const u32 *old_gscr = dev->gscr; | |
561 | u16 old_vendor, new_vendor, old_devid, new_devid; | |
562 | int old_nr_ports, new_nr_ports; | |
563 | ||
564 | old_vendor = sata_pmp_gscr_vendor(old_gscr); | |
565 | new_vendor = sata_pmp_gscr_vendor(new_gscr); | |
566 | old_devid = sata_pmp_gscr_devid(old_gscr); | |
567 | new_devid = sata_pmp_gscr_devid(new_gscr); | |
568 | old_nr_ports = sata_pmp_gscr_ports(old_gscr); | |
569 | new_nr_ports = sata_pmp_gscr_ports(new_gscr); | |
570 | ||
571 | if (old_vendor != new_vendor) { | |
572 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier " | |
573 | "vendor mismatch '0x%x' != '0x%x'\n", | |
574 | old_vendor, new_vendor); | |
575 | return 0; | |
576 | } | |
577 | ||
578 | if (old_devid != new_devid) { | |
579 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier " | |
580 | "device ID mismatch '0x%x' != '0x%x'\n", | |
581 | old_devid, new_devid); | |
582 | return 0; | |
583 | } | |
584 | ||
585 | if (old_nr_ports != new_nr_ports) { | |
586 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier " | |
587 | "nr_ports mismatch '0x%x' != '0x%x'\n", | |
588 | old_nr_ports, new_nr_ports); | |
589 | return 0; | |
590 | } | |
591 | ||
592 | return 1; | |
593 | } | |
594 | ||
595 | /** | |
596 | * sata_pmp_revalidate - revalidate SATA PMP | |
597 | * @dev: PMP device to revalidate | |
598 | * @new_class: new class code | |
599 | * | |
600 | * Re-read GSCR block and make sure @dev is still attached to the | |
601 | * port and properly configured. | |
602 | * | |
603 | * LOCKING: | |
604 | * Kernel thread context (may sleep). | |
605 | * | |
606 | * RETURNS: | |
607 | * 0 on success, -errno otherwise. | |
608 | */ | |
609 | static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class) | |
610 | { | |
611 | struct ata_link *link = dev->link; | |
612 | struct ata_port *ap = link->ap; | |
613 | u32 *gscr = (void *)ap->sector_buf; | |
614 | int rc; | |
615 | ||
616 | DPRINTK("ENTER\n"); | |
617 | ||
618 | ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE); | |
619 | ||
620 | if (!ata_dev_enabled(dev)) { | |
621 | rc = -ENODEV; | |
622 | goto fail; | |
623 | } | |
624 | ||
625 | /* wrong class? */ | |
626 | if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) { | |
627 | rc = -ENODEV; | |
628 | goto fail; | |
629 | } | |
630 | ||
631 | /* read GSCR */ | |
632 | rc = sata_pmp_read_gscr(dev, gscr); | |
633 | if (rc) | |
634 | goto fail; | |
635 | ||
636 | /* is the pmp still there? */ | |
637 | if (!sata_pmp_same_pmp(dev, gscr)) { | |
638 | rc = -ENODEV; | |
639 | goto fail; | |
640 | } | |
641 | ||
642 | memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS); | |
643 | ||
644 | rc = sata_pmp_configure(dev, 0); | |
645 | if (rc) | |
646 | goto fail; | |
647 | ||
648 | ata_eh_done(link, NULL, ATA_EH_REVALIDATE); | |
649 | ||
650 | DPRINTK("EXIT, rc=0\n"); | |
651 | return 0; | |
652 | ||
653 | fail: | |
654 | ata_dev_printk(dev, KERN_ERR, | |
655 | "PMP revalidation failed (errno=%d)\n", rc); | |
656 | DPRINTK("EXIT, rc=%d\n", rc); | |
657 | return rc; | |
658 | } | |
659 | ||
660 | /** | |
661 | * sata_pmp_revalidate_quick - revalidate SATA PMP quickly | |
662 | * @dev: PMP device to revalidate | |
663 | * | |
664 | * Make sure the attached PMP is accessible. | |
665 | * | |
666 | * LOCKING: | |
667 | * Kernel thread context (may sleep). | |
668 | * | |
669 | * RETURNS: | |
670 | * 0 on success, -errno otherwise. | |
671 | */ | |
672 | static int sata_pmp_revalidate_quick(struct ata_device *dev) | |
673 | { | |
674 | unsigned int err_mask; | |
675 | u32 prod_id; | |
676 | ||
677 | err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id); | |
678 | if (err_mask) { | |
679 | ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID " | |
680 | "(Emask=0x%x)\n", err_mask); | |
681 | return -EIO; | |
682 | } | |
683 | ||
684 | if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) { | |
685 | ata_dev_printk(dev, KERN_ERR, "PMP product ID mismatch\n"); | |
686 | /* something weird is going on, request full PMP recovery */ | |
687 | return -EIO; | |
688 | } | |
689 | ||
690 | return 0; | |
691 | } | |
692 | ||
693 | /** | |
694 | * sata_pmp_eh_recover_pmp - recover PMP | |
695 | * @ap: ATA port PMP is attached to | |
696 | * @prereset: prereset method (can be NULL) | |
697 | * @softreset: softreset method | |
698 | * @hardreset: hardreset method | |
699 | * @postreset: postreset method (can be NULL) | |
700 | * | |
701 | * Recover PMP attached to @ap. Recovery procedure is somewhat | |
702 | * similar to that of ata_eh_recover() except that reset should | |
703 | * always be performed in hard->soft sequence and recovery | |
704 | * failure results in PMP detachment. | |
705 | * | |
706 | * LOCKING: | |
707 | * Kernel thread context (may sleep). | |
708 | * | |
709 | * RETURNS: | |
710 | * 0 on success, -errno on failure. | |
711 | */ | |
712 | static int sata_pmp_eh_recover_pmp(struct ata_port *ap, | |
713 | ata_prereset_fn_t prereset, ata_reset_fn_t softreset, | |
714 | ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) | |
715 | { | |
716 | struct ata_link *link = &ap->link; | |
717 | struct ata_eh_context *ehc = &link->eh_context; | |
718 | struct ata_device *dev = link->device; | |
719 | int tries = ATA_EH_PMP_TRIES; | |
720 | int detach = 0, rc = 0; | |
721 | int reval_failed = 0; | |
722 | ||
723 | DPRINTK("ENTER\n"); | |
724 | ||
725 | if (dev->flags & ATA_DFLAG_DETACH) { | |
726 | detach = 1; | |
727 | goto fail; | |
728 | } | |
729 | ||
730 | retry: | |
731 | ehc->classes[0] = ATA_DEV_UNKNOWN; | |
732 | ||
733 | if (ehc->i.action & ATA_EH_RESET) { | |
734 | struct ata_link *tlink; | |
735 | ||
736 | /* reset */ | |
737 | rc = ata_eh_reset(link, 0, prereset, softreset, hardreset, | |
738 | postreset); | |
739 | if (rc) { | |
740 | ata_link_printk(link, KERN_ERR, | |
741 | "failed to reset PMP, giving up\n"); | |
742 | goto fail; | |
743 | } | |
744 | ||
745 | /* PMP is reset, SErrors cannot be trusted, scan all */ | |
746 | ata_for_each_link(tlink, ap, EDGE) { | |
747 | struct ata_eh_context *ehc = &tlink->eh_context; | |
748 | ||
749 | ehc->i.probe_mask |= ATA_ALL_DEVICES; | |
750 | ehc->i.action |= ATA_EH_RESET; | |
751 | } | |
752 | } | |
753 | ||
754 | /* If revalidation is requested, revalidate and reconfigure; | |
755 | * otherwise, do quick revalidation. | |
756 | */ | |
757 | if (ehc->i.action & ATA_EH_REVALIDATE) | |
758 | rc = sata_pmp_revalidate(dev, ehc->classes[0]); | |
759 | else | |
760 | rc = sata_pmp_revalidate_quick(dev); | |
761 | ||
762 | if (rc) { | |
763 | tries--; | |
764 | ||
765 | if (rc == -ENODEV) { | |
766 | ehc->i.probe_mask |= ATA_ALL_DEVICES; | |
767 | detach = 1; | |
768 | /* give it just two more chances */ | |
769 | tries = min(tries, 2); | |
770 | } | |
771 | ||
772 | if (tries) { | |
773 | /* consecutive revalidation failures? speed down */ | |
774 | if (reval_failed) | |
775 | sata_down_spd_limit(link, 0); | |
776 | else | |
777 | reval_failed = 1; | |
778 | ||
779 | ehc->i.action |= ATA_EH_RESET; | |
780 | goto retry; | |
781 | } else { | |
782 | ata_dev_printk(dev, KERN_ERR, "failed to recover PMP " | |
783 | "after %d tries, giving up\n", | |
784 | ATA_EH_PMP_TRIES); | |
785 | goto fail; | |
786 | } | |
787 | } | |
788 | ||
789 | /* okay, PMP resurrected */ | |
790 | ehc->i.flags = 0; | |
791 | ||
792 | DPRINTK("EXIT, rc=0\n"); | |
793 | return 0; | |
794 | ||
795 | fail: | |
796 | sata_pmp_detach(dev); | |
797 | if (detach) | |
798 | ata_eh_detach_dev(dev); | |
799 | else | |
800 | ata_dev_disable(dev); | |
801 | ||
802 | DPRINTK("EXIT, rc=%d\n", rc); | |
803 | return rc; | |
804 | } | |
805 | ||
806 | static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap) | |
807 | { | |
808 | struct ata_link *link; | |
809 | unsigned long flags; | |
810 | int rc; | |
811 | ||
812 | spin_lock_irqsave(ap->lock, flags); | |
813 | ||
814 | ata_for_each_link(link, ap, EDGE) { | |
815 | if (!(link->flags & ATA_LFLAG_DISABLED)) | |
816 | continue; | |
817 | ||
818 | spin_unlock_irqrestore(ap->lock, flags); | |
819 | ||
820 | /* Some PMPs require hardreset sequence to get | |
821 | * SError.N working. | |
822 | */ | |
823 | sata_link_hardreset(link, sata_deb_timing_normal, | |
824 | ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK), | |
825 | NULL, NULL); | |
826 | ||
827 | /* unconditionally clear SError.N */ | |
828 | rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG); | |
829 | if (rc) { | |
830 | ata_link_printk(link, KERN_ERR, "failed to clear " | |
831 | "SError.N (errno=%d)\n", rc); | |
832 | return rc; | |
833 | } | |
834 | ||
835 | spin_lock_irqsave(ap->lock, flags); | |
836 | } | |
837 | ||
838 | spin_unlock_irqrestore(ap->lock, flags); | |
839 | ||
840 | return 0; | |
841 | } | |
842 | ||
843 | static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries) | |
844 | { | |
845 | struct ata_port *ap = link->ap; | |
846 | unsigned long flags; | |
847 | ||
848 | if (link_tries[link->pmp] && --link_tries[link->pmp]) | |
849 | return 1; | |
850 | ||
851 | /* disable this link */ | |
852 | if (!(link->flags & ATA_LFLAG_DISABLED)) { | |
853 | ata_link_printk(link, KERN_WARNING, | |
854 | "failed to recover link after %d tries, disabling\n", | |
855 | ATA_EH_PMP_LINK_TRIES); | |
856 | ||
857 | spin_lock_irqsave(ap->lock, flags); | |
858 | link->flags |= ATA_LFLAG_DISABLED; | |
859 | spin_unlock_irqrestore(ap->lock, flags); | |
860 | } | |
861 | ||
862 | ata_dev_disable(link->device); | |
863 | link->eh_context.i.action = 0; | |
864 | ||
865 | return 0; | |
866 | } | |
867 | ||
868 | /** | |
869 | * sata_pmp_eh_recover - recover PMP-enabled port | |
870 | * @ap: ATA port to recover | |
871 | * | |
872 | * Drive EH recovery operation for PMP enabled port @ap. This | |
873 | * function recovers host and PMP ports with proper retrials and | |
874 | * fallbacks. Actual recovery operations are performed using | |
875 | * ata_eh_recover() and sata_pmp_eh_recover_pmp(). | |
876 | * | |
877 | * LOCKING: | |
878 | * Kernel thread context (may sleep). | |
879 | * | |
880 | * RETURNS: | |
881 | * 0 on success, -errno on failure. | |
882 | */ | |
883 | static int sata_pmp_eh_recover(struct ata_port *ap) | |
884 | { | |
885 | struct ata_port_operations *ops = ap->ops; | |
886 | int pmp_tries, link_tries[SATA_PMP_MAX_PORTS]; | |
887 | struct ata_link *pmp_link = &ap->link; | |
888 | struct ata_device *pmp_dev = pmp_link->device; | |
889 | struct ata_eh_context *pmp_ehc = &pmp_link->eh_context; | |
890 | u32 *gscr = pmp_dev->gscr; | |
891 | struct ata_link *link; | |
892 | struct ata_device *dev; | |
893 | unsigned int err_mask; | |
894 | u32 gscr_error, sntf; | |
895 | int cnt, rc; | |
896 | ||
897 | pmp_tries = ATA_EH_PMP_TRIES; | |
898 | ata_for_each_link(link, ap, EDGE) | |
899 | link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; | |
900 | ||
901 | retry: | |
902 | /* PMP attached? */ | |
903 | if (!sata_pmp_attached(ap)) { | |
904 | rc = ata_eh_recover(ap, ops->prereset, ops->softreset, | |
905 | ops->hardreset, ops->postreset, NULL); | |
906 | if (rc) { | |
907 | ata_for_each_dev(dev, &ap->link, ALL) | |
908 | ata_dev_disable(dev); | |
909 | return rc; | |
910 | } | |
911 | ||
912 | if (pmp_dev->class != ATA_DEV_PMP) | |
913 | return 0; | |
914 | ||
915 | /* new PMP online */ | |
916 | ata_for_each_link(link, ap, EDGE) | |
917 | link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; | |
918 | ||
919 | /* fall through */ | |
920 | } | |
921 | ||
922 | /* recover pmp */ | |
923 | rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset, | |
924 | ops->hardreset, ops->postreset); | |
925 | if (rc) | |
926 | goto pmp_fail; | |
927 | ||
928 | /* PHY event notification can disturb reset and other recovery | |
929 | * operations. Turn it off. | |
930 | */ | |
931 | if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) { | |
932 | gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY; | |
933 | ||
934 | err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN, | |
935 | gscr[SATA_PMP_GSCR_FEAT_EN]); | |
936 | if (err_mask) { | |
937 | ata_link_printk(pmp_link, KERN_WARNING, | |
938 | "failed to disable NOTIFY (err_mask=0x%x)\n", | |
939 | err_mask); | |
940 | goto pmp_fail; | |
941 | } | |
942 | } | |
943 | ||
944 | /* handle disabled links */ | |
945 | rc = sata_pmp_eh_handle_disabled_links(ap); | |
946 | if (rc) | |
947 | goto pmp_fail; | |
948 | ||
949 | /* recover links */ | |
950 | rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset, | |
951 | ops->pmp_hardreset, ops->pmp_postreset, &link); | |
952 | if (rc) | |
953 | goto link_fail; | |
954 | ||
955 | /* Connection status might have changed while resetting other | |
956 | * links, check SATA_PMP_GSCR_ERROR before returning. | |
957 | */ | |
958 | ||
959 | /* clear SNotification */ | |
960 | rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf); | |
961 | if (rc == 0) | |
962 | sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf); | |
963 | ||
964 | /* enable notification */ | |
965 | if (pmp_dev->flags & ATA_DFLAG_AN) { | |
966 | gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY; | |
967 | ||
968 | err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN, | |
969 | gscr[SATA_PMP_GSCR_FEAT_EN]); | |
970 | if (err_mask) { | |
971 | ata_dev_printk(pmp_dev, KERN_ERR, "failed to write " | |
972 | "PMP_FEAT_EN (Emask=0x%x)\n", err_mask); | |
973 | rc = -EIO; | |
974 | goto pmp_fail; | |
975 | } | |
976 | } | |
977 | ||
978 | /* check GSCR_ERROR */ | |
979 | err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error); | |
980 | if (err_mask) { | |
981 | ata_dev_printk(pmp_dev, KERN_ERR, "failed to read " | |
982 | "PMP_GSCR_ERROR (Emask=0x%x)\n", err_mask); | |
983 | rc = -EIO; | |
984 | goto pmp_fail; | |
985 | } | |
986 | ||
987 | cnt = 0; | |
988 | ata_for_each_link(link, ap, EDGE) { | |
989 | if (!(gscr_error & (1 << link->pmp))) | |
990 | continue; | |
991 | ||
992 | if (sata_pmp_handle_link_fail(link, link_tries)) { | |
993 | ata_ehi_hotplugged(&link->eh_context.i); | |
994 | cnt++; | |
995 | } else { | |
996 | ata_link_printk(link, KERN_WARNING, | |
997 | "PHY status changed but maxed out on retries, " | |
998 | "giving up\n"); | |
999 | ata_link_printk(link, KERN_WARNING, | |
1000 | "Manully issue scan to resume this link\n"); | |
1001 | } | |
1002 | } | |
1003 | ||
1004 | if (cnt) { | |
1005 | ata_port_printk(ap, KERN_INFO, "PMP SError.N set for some " | |
1006 | "ports, repeating recovery\n"); | |
1007 | goto retry; | |
1008 | } | |
1009 | ||
1010 | return 0; | |
1011 | ||
1012 | link_fail: | |
1013 | if (sata_pmp_handle_link_fail(link, link_tries)) { | |
1014 | pmp_ehc->i.action |= ATA_EH_RESET; | |
1015 | goto retry; | |
1016 | } | |
1017 | ||
1018 | /* fall through */ | |
1019 | pmp_fail: | |
1020 | /* Control always ends up here after detaching PMP. Shut up | |
1021 | * and return if we're unloading. | |
1022 | */ | |
1023 | if (ap->pflags & ATA_PFLAG_UNLOADING) | |
1024 | return rc; | |
1025 | ||
1026 | if (!sata_pmp_attached(ap)) | |
1027 | goto retry; | |
1028 | ||
1029 | if (--pmp_tries) { | |
1030 | pmp_ehc->i.action |= ATA_EH_RESET; | |
1031 | goto retry; | |
1032 | } | |
1033 | ||
1034 | ata_port_printk(ap, KERN_ERR, | |
1035 | "failed to recover PMP after %d tries, giving up\n", | |
1036 | ATA_EH_PMP_TRIES); | |
1037 | sata_pmp_detach(pmp_dev); | |
1038 | ata_dev_disable(pmp_dev); | |
1039 | ||
1040 | return rc; | |
1041 | } | |
1042 | ||
1043 | /** | |
1044 | * sata_pmp_error_handler - do standard error handling for PMP-enabled host | |
1045 | * @ap: host port to handle error for | |
1046 | * | |
1047 | * Perform standard error handling sequence for PMP-enabled host | |
1048 | * @ap. | |
1049 | * | |
1050 | * LOCKING: | |
1051 | * Kernel thread context (may sleep). | |
1052 | */ | |
1053 | void sata_pmp_error_handler(struct ata_port *ap) | |
1054 | { | |
1055 | ata_eh_autopsy(ap); | |
1056 | ata_eh_report(ap); | |
1057 | sata_pmp_eh_recover(ap); | |
1058 | ata_eh_finish(ap); | |
1059 | } | |
1060 | ||
1061 | EXPORT_SYMBOL_GPL(sata_pmp_port_ops); | |
1062 | EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch); | |
1063 | EXPORT_SYMBOL_GPL(sata_pmp_error_handler); |