Commit | Line | Data |
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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 | ||
48515f6c TH |
14 | const struct ata_port_operations sata_pmp_port_ops = { |
15 | .inherits = &sata_port_ops, | |
16 | .pmp_prereset = ata_std_prereset, | |
17 | .pmp_hardreset = sata_std_hardreset, | |
18 | .pmp_postreset = ata_std_postreset, | |
19 | .error_handler = sata_pmp_error_handler, | |
20 | }; | |
21 | ||
3af9a77a TH |
22 | /** |
23 | * sata_pmp_read - read PMP register | |
24 | * @link: link to read PMP register for | |
25 | * @reg: register to read | |
26 | * @r_val: resulting value | |
27 | * | |
b06ce3e5 | 28 | * Read PMP register. |
3af9a77a TH |
29 | * |
30 | * LOCKING: | |
31 | * Kernel thread context (may sleep). | |
32 | * | |
33 | * RETURNS: | |
b06ce3e5 | 34 | * 0 on success, AC_ERR_* mask on failure. |
3af9a77a | 35 | */ |
b06ce3e5 | 36 | static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val) |
3af9a77a TH |
37 | { |
38 | struct ata_port *ap = link->ap; | |
39 | struct ata_device *pmp_dev = ap->link.device; | |
b06ce3e5 TH |
40 | struct ata_taskfile tf; |
41 | unsigned int err_mask; | |
42 | ||
43 | ata_tf_init(pmp_dev, &tf); | |
44 | tf.command = ATA_CMD_PMP_READ; | |
45 | tf.protocol = ATA_PROT_NODATA; | |
39f25e70 | 46 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; |
b06ce3e5 TH |
47 | tf.feature = reg; |
48 | tf.device = link->pmp; | |
49 | ||
50 | err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0, | |
51 | SATA_PMP_SCR_TIMEOUT); | |
52 | if (err_mask) | |
53 | return err_mask; | |
54 | ||
55 | *r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24; | |
56 | return 0; | |
3af9a77a TH |
57 | } |
58 | ||
59 | /** | |
60 | * sata_pmp_write - write PMP register | |
61 | * @link: link to write PMP register for | |
62 | * @reg: register to write | |
63 | * @r_val: value to write | |
64 | * | |
b06ce3e5 | 65 | * Write PMP register. |
3af9a77a TH |
66 | * |
67 | * LOCKING: | |
68 | * Kernel thread context (may sleep). | |
69 | * | |
70 | * RETURNS: | |
b06ce3e5 | 71 | * 0 on success, AC_ERR_* mask on failure. |
3af9a77a | 72 | */ |
b06ce3e5 | 73 | static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val) |
3af9a77a TH |
74 | { |
75 | struct ata_port *ap = link->ap; | |
76 | struct ata_device *pmp_dev = ap->link.device; | |
b06ce3e5 TH |
77 | struct ata_taskfile tf; |
78 | ||
79 | ata_tf_init(pmp_dev, &tf); | |
80 | tf.command = ATA_CMD_PMP_WRITE; | |
81 | tf.protocol = ATA_PROT_NODATA; | |
39f25e70 | 82 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; |
b06ce3e5 TH |
83 | tf.feature = reg; |
84 | tf.device = link->pmp; | |
85 | tf.nsect = val & 0xff; | |
86 | tf.lbal = (val >> 8) & 0xff; | |
87 | tf.lbam = (val >> 16) & 0xff; | |
88 | tf.lbah = (val >> 24) & 0xff; | |
89 | ||
90 | return ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0, | |
91 | SATA_PMP_SCR_TIMEOUT); | |
3af9a77a TH |
92 | } |
93 | ||
31f88384 TH |
94 | /** |
95 | * sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP | |
96 | * @qc: ATA command in question | |
97 | * | |
98 | * A host which has command switching PMP support cannot issue | |
99 | * commands to multiple links simultaneously. | |
100 | * | |
101 | * LOCKING: | |
102 | * spin_lock_irqsave(host lock) | |
103 | * | |
104 | * RETURNS: | |
105 | * ATA_DEFER_* if deferring is needed, 0 otherwise. | |
106 | */ | |
107 | int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc) | |
108 | { | |
109 | struct ata_link *link = qc->dev->link; | |
110 | struct ata_port *ap = link->ap; | |
111 | ||
112 | if (ap->excl_link == NULL || ap->excl_link == link) { | |
113 | if (ap->nr_active_links == 0 || ata_link_active(link)) { | |
114 | qc->flags |= ATA_QCFLAG_CLEAR_EXCL; | |
115 | return ata_std_qc_defer(qc); | |
116 | } | |
117 | ||
118 | ap->excl_link = link; | |
119 | } | |
120 | ||
121 | return ATA_DEFER_PORT; | |
122 | } | |
123 | ||
3af9a77a TH |
124 | /** |
125 | * sata_pmp_scr_read - read PSCR | |
126 | * @link: ATA link to read PSCR for | |
127 | * @reg: PSCR to read | |
128 | * @r_val: resulting value | |
129 | * | |
130 | * Read PSCR @reg into @r_val for @link, to be called from | |
131 | * ata_scr_read(). | |
132 | * | |
133 | * LOCKING: | |
134 | * Kernel thread context (may sleep). | |
135 | * | |
136 | * RETURNS: | |
137 | * 0 on success, -errno on failure. | |
138 | */ | |
139 | int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val) | |
140 | { | |
b06ce3e5 TH |
141 | unsigned int err_mask; |
142 | ||
3af9a77a TH |
143 | if (reg > SATA_PMP_PSCR_CONTROL) |
144 | return -EINVAL; | |
145 | ||
b06ce3e5 TH |
146 | err_mask = sata_pmp_read(link, reg, r_val); |
147 | if (err_mask) { | |
148 | ata_link_printk(link, KERN_WARNING, "failed to read SCR %d " | |
149 | "(Emask=0x%x)\n", reg, err_mask); | |
150 | return -EIO; | |
151 | } | |
152 | return 0; | |
3af9a77a TH |
153 | } |
154 | ||
155 | /** | |
156 | * sata_pmp_scr_write - write PSCR | |
157 | * @link: ATA link to write PSCR for | |
158 | * @reg: PSCR to write | |
159 | * @val: value to be written | |
160 | * | |
161 | * Write @val to PSCR @reg for @link, to be called from | |
162 | * ata_scr_write() and ata_scr_write_flush(). | |
163 | * | |
164 | * LOCKING: | |
165 | * Kernel thread context (may sleep). | |
166 | * | |
167 | * RETURNS: | |
168 | * 0 on success, -errno on failure. | |
169 | */ | |
170 | int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val) | |
171 | { | |
b06ce3e5 TH |
172 | unsigned int err_mask; |
173 | ||
3af9a77a TH |
174 | if (reg > SATA_PMP_PSCR_CONTROL) |
175 | return -EINVAL; | |
176 | ||
b06ce3e5 TH |
177 | err_mask = sata_pmp_write(link, reg, val); |
178 | if (err_mask) { | |
179 | ata_link_printk(link, KERN_WARNING, "failed to write SCR %d " | |
180 | "(Emask=0x%x)\n", reg, err_mask); | |
181 | return -EIO; | |
182 | } | |
183 | return 0; | |
3af9a77a TH |
184 | } |
185 | ||
3af9a77a TH |
186 | /** |
187 | * sata_pmp_read_gscr - read GSCR block of SATA PMP | |
188 | * @dev: PMP device | |
189 | * @gscr: buffer to read GSCR block into | |
190 | * | |
191 | * Read selected PMP GSCRs from the PMP at @dev. This will serve | |
192 | * as configuration and identification info for the PMP. | |
193 | * | |
194 | * LOCKING: | |
195 | * Kernel thread context (may sleep). | |
196 | * | |
197 | * RETURNS: | |
198 | * 0 on success, -errno on failure. | |
199 | */ | |
200 | static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr) | |
201 | { | |
202 | static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 }; | |
b06ce3e5 | 203 | int i; |
3af9a77a TH |
204 | |
205 | for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) { | |
206 | int reg = gscr_to_read[i]; | |
b06ce3e5 | 207 | unsigned int err_mask; |
3af9a77a | 208 | |
b06ce3e5 TH |
209 | err_mask = sata_pmp_read(dev->link, reg, &gscr[reg]); |
210 | if (err_mask) { | |
211 | ata_dev_printk(dev, KERN_ERR, "failed to read PMP " | |
212 | "GSCR[%d] (Emask=0x%x)\n", reg, err_mask); | |
213 | return -EIO; | |
3af9a77a TH |
214 | } |
215 | } | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
220 | static const char *sata_pmp_spec_rev_str(const u32 *gscr) | |
221 | { | |
222 | u32 rev = gscr[SATA_PMP_GSCR_REV]; | |
223 | ||
224 | if (rev & (1 << 2)) | |
225 | return "1.1"; | |
226 | if (rev & (1 << 1)) | |
227 | return "1.0"; | |
228 | return "<unknown>"; | |
229 | } | |
230 | ||
231 | static int sata_pmp_configure(struct ata_device *dev, int print_info) | |
232 | { | |
233 | struct ata_port *ap = dev->link->ap; | |
234 | u32 *gscr = dev->gscr; | |
b06ce3e5 | 235 | unsigned int err_mask = 0; |
3af9a77a TH |
236 | const char *reason; |
237 | int nr_ports, rc; | |
238 | ||
239 | nr_ports = sata_pmp_gscr_ports(gscr); | |
240 | ||
241 | if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) { | |
242 | rc = -EINVAL; | |
243 | reason = "invalid nr_ports"; | |
244 | goto fail; | |
245 | } | |
246 | ||
247 | if ((ap->flags & ATA_FLAG_AN) && | |
248 | (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY)) | |
249 | dev->flags |= ATA_DFLAG_AN; | |
250 | ||
251 | /* monitor SERR_PHYRDY_CHG on fan-out ports */ | |
b06ce3e5 TH |
252 | err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN, |
253 | SERR_PHYRDY_CHG); | |
254 | if (err_mask) { | |
255 | rc = -EIO; | |
3af9a77a TH |
256 | reason = "failed to write GSCR_ERROR_EN"; |
257 | goto fail; | |
258 | } | |
259 | ||
260 | /* turn off notification till fan-out ports are reset and configured */ | |
261 | if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) { | |
262 | gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY; | |
263 | ||
b06ce3e5 TH |
264 | err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_FEAT_EN, |
265 | gscr[SATA_PMP_GSCR_FEAT_EN]); | |
266 | if (err_mask) { | |
267 | rc = -EIO; | |
3af9a77a TH |
268 | reason = "failed to write GSCR_FEAT_EN"; |
269 | goto fail; | |
270 | } | |
271 | } | |
272 | ||
273 | if (print_info) { | |
274 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier %s, " | |
275 | "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n", | |
276 | sata_pmp_spec_rev_str(gscr), | |
277 | sata_pmp_gscr_vendor(gscr), | |
278 | sata_pmp_gscr_devid(gscr), | |
279 | sata_pmp_gscr_rev(gscr), | |
280 | nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN], | |
281 | gscr[SATA_PMP_GSCR_FEAT]); | |
282 | ||
283 | if (!(dev->flags & ATA_DFLAG_AN)) | |
284 | ata_dev_printk(dev, KERN_INFO, | |
285 | "Asynchronous notification not supported, " | |
286 | "hotplug won't\n work on fan-out " | |
287 | "ports. Use warm-plug instead.\n"); | |
288 | } | |
289 | ||
290 | return 0; | |
291 | ||
292 | fail: | |
293 | ata_dev_printk(dev, KERN_ERR, | |
b06ce3e5 TH |
294 | "failed to configure Port Multiplier (%s, Emask=0x%x)\n", |
295 | reason, err_mask); | |
3af9a77a TH |
296 | return rc; |
297 | } | |
298 | ||
299 | static int sata_pmp_init_links(struct ata_port *ap, int nr_ports) | |
300 | { | |
301 | struct ata_link *pmp_link = ap->pmp_link; | |
302 | int i; | |
303 | ||
304 | if (!pmp_link) { | |
305 | pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS, | |
306 | GFP_NOIO); | |
307 | if (!pmp_link) | |
308 | return -ENOMEM; | |
309 | ||
310 | for (i = 0; i < SATA_PMP_MAX_PORTS; i++) | |
311 | ata_link_init(ap, &pmp_link[i], i); | |
312 | ||
313 | ap->pmp_link = pmp_link; | |
314 | } | |
315 | ||
316 | for (i = 0; i < nr_ports; i++) { | |
317 | struct ata_link *link = &pmp_link[i]; | |
318 | struct ata_eh_context *ehc = &link->eh_context; | |
319 | ||
320 | link->flags = 0; | |
b558eddd | 321 | ehc->i.probe_mask |= ATA_ALL_DEVICES; |
cf480626 | 322 | ehc->i.action |= ATA_EH_RESET; |
3af9a77a TH |
323 | } |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
328 | static void sata_pmp_quirks(struct ata_port *ap) | |
329 | { | |
330 | u32 *gscr = ap->link.device->gscr; | |
331 | u16 vendor = sata_pmp_gscr_vendor(gscr); | |
332 | u16 devid = sata_pmp_gscr_devid(gscr); | |
333 | struct ata_link *link; | |
334 | ||
335 | if (vendor == 0x1095 && devid == 0x3726) { | |
336 | /* sil3726 quirks */ | |
337 | ata_port_for_each_link(link, ap) { | |
3af9a77a TH |
338 | /* class code report is unreliable */ |
339 | if (link->pmp < 5) | |
340 | link->flags |= ATA_LFLAG_ASSUME_ATA; | |
341 | ||
342 | /* port 5 is for SEMB device and it doesn't like SRST */ | |
343 | if (link->pmp == 5) | |
344 | link->flags |= ATA_LFLAG_NO_SRST | | |
345 | ATA_LFLAG_ASSUME_SEMB; | |
346 | } | |
347 | } else if (vendor == 0x1095 && devid == 0x4723) { | |
348 | /* sil4723 quirks */ | |
349 | ata_port_for_each_link(link, ap) { | |
3af9a77a TH |
350 | /* class code report is unreliable */ |
351 | if (link->pmp < 2) | |
352 | link->flags |= ATA_LFLAG_ASSUME_ATA; | |
353 | ||
354 | /* the config device at port 2 locks up on SRST */ | |
355 | if (link->pmp == 2) | |
356 | link->flags |= ATA_LFLAG_NO_SRST | | |
357 | ATA_LFLAG_ASSUME_ATA; | |
358 | } | |
359 | } else if (vendor == 0x1095 && devid == 0x4726) { | |
360 | /* sil4726 quirks */ | |
361 | ata_port_for_each_link(link, ap) { | |
8048307d TH |
362 | /* Class code report is unreliable and SRST |
363 | * times out under certain configurations. | |
364 | * Config device can be at port 0 or 5 and | |
365 | * locks up on SRST. | |
3af9a77a | 366 | */ |
8048307d | 367 | if (link->pmp <= 5) |
3af9a77a TH |
368 | link->flags |= ATA_LFLAG_NO_SRST | |
369 | ATA_LFLAG_ASSUME_ATA; | |
370 | ||
371 | /* Port 6 is for SEMB device which doesn't | |
372 | * like SRST either. | |
373 | */ | |
374 | if (link->pmp == 6) | |
375 | link->flags |= ATA_LFLAG_NO_SRST | | |
376 | ATA_LFLAG_ASSUME_SEMB; | |
377 | } | |
378 | } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 || | |
379 | devid == 0x5734 || devid == 0x5744)) { | |
380 | /* sil5723/5744 quirks */ | |
381 | ||
382 | /* sil5723/5744 has either two or three downstream | |
383 | * ports depending on operation mode. The last port | |
384 | * is empty if any actual IO device is available or | |
385 | * occupied by a pseudo configuration device | |
386 | * otherwise. Don't try hard to recover it. | |
387 | */ | |
388 | ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY; | |
3af9a77a TH |
389 | } |
390 | } | |
391 | ||
392 | /** | |
393 | * sata_pmp_attach - attach a SATA PMP device | |
394 | * @dev: SATA PMP device to attach | |
395 | * | |
396 | * Configure and attach SATA PMP device @dev. This function is | |
397 | * also responsible for allocating and initializing PMP links. | |
398 | * | |
399 | * LOCKING: | |
400 | * Kernel thread context (may sleep). | |
401 | * | |
402 | * RETURNS: | |
403 | * 0 on success, -errno on failure. | |
404 | */ | |
405 | int sata_pmp_attach(struct ata_device *dev) | |
406 | { | |
407 | struct ata_link *link = dev->link; | |
408 | struct ata_port *ap = link->ap; | |
409 | unsigned long flags; | |
410 | struct ata_link *tlink; | |
411 | int rc; | |
412 | ||
413 | /* is it hanging off the right place? */ | |
414 | if (!(ap->flags & ATA_FLAG_PMP)) { | |
415 | ata_dev_printk(dev, KERN_ERR, | |
416 | "host does not support Port Multiplier\n"); | |
417 | return -EINVAL; | |
418 | } | |
419 | ||
420 | if (!ata_is_host_link(link)) { | |
421 | ata_dev_printk(dev, KERN_ERR, | |
422 | "Port Multipliers cannot be nested\n"); | |
423 | return -EINVAL; | |
424 | } | |
425 | ||
426 | if (dev->devno) { | |
427 | ata_dev_printk(dev, KERN_ERR, | |
428 | "Port Multiplier must be the first device\n"); | |
429 | return -EINVAL; | |
430 | } | |
431 | ||
432 | WARN_ON(link->pmp != 0); | |
433 | link->pmp = SATA_PMP_CTRL_PORT; | |
434 | ||
435 | /* read GSCR block */ | |
436 | rc = sata_pmp_read_gscr(dev, dev->gscr); | |
437 | if (rc) | |
438 | goto fail; | |
439 | ||
440 | /* config PMP */ | |
441 | rc = sata_pmp_configure(dev, 1); | |
442 | if (rc) | |
443 | goto fail; | |
444 | ||
445 | rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr)); | |
446 | if (rc) { | |
447 | ata_dev_printk(dev, KERN_INFO, | |
448 | "failed to initialize PMP links\n"); | |
449 | goto fail; | |
450 | } | |
451 | ||
452 | /* attach it */ | |
453 | spin_lock_irqsave(ap->lock, flags); | |
454 | WARN_ON(ap->nr_pmp_links); | |
455 | ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr); | |
456 | spin_unlock_irqrestore(ap->lock, flags); | |
457 | ||
458 | sata_pmp_quirks(ap); | |
459 | ||
460 | if (ap->ops->pmp_attach) | |
461 | ap->ops->pmp_attach(ap); | |
462 | ||
463 | ata_port_for_each_link(tlink, ap) | |
464 | sata_link_init_spd(tlink); | |
465 | ||
d0df8b5d TH |
466 | ata_acpi_associate_sata_port(ap); |
467 | ||
3af9a77a TH |
468 | return 0; |
469 | ||
470 | fail: | |
471 | link->pmp = 0; | |
472 | return rc; | |
473 | } | |
474 | ||
475 | /** | |
476 | * sata_pmp_detach - detach a SATA PMP device | |
477 | * @dev: SATA PMP device to detach | |
478 | * | |
479 | * Detach SATA PMP device @dev. This function is also | |
480 | * responsible for deconfiguring PMP links. | |
481 | * | |
482 | * LOCKING: | |
483 | * Kernel thread context (may sleep). | |
484 | */ | |
485 | static void sata_pmp_detach(struct ata_device *dev) | |
486 | { | |
487 | struct ata_link *link = dev->link; | |
488 | struct ata_port *ap = link->ap; | |
489 | struct ata_link *tlink; | |
490 | unsigned long flags; | |
491 | ||
492 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier detaching\n"); | |
493 | ||
494 | WARN_ON(!ata_is_host_link(link) || dev->devno || | |
495 | link->pmp != SATA_PMP_CTRL_PORT); | |
496 | ||
497 | if (ap->ops->pmp_detach) | |
498 | ap->ops->pmp_detach(ap); | |
499 | ||
500 | ata_port_for_each_link(tlink, ap) | |
501 | ata_eh_detach_dev(tlink->device); | |
502 | ||
503 | spin_lock_irqsave(ap->lock, flags); | |
504 | ap->nr_pmp_links = 0; | |
505 | link->pmp = 0; | |
506 | spin_unlock_irqrestore(ap->lock, flags); | |
d0df8b5d TH |
507 | |
508 | ata_acpi_associate_sata_port(ap); | |
3af9a77a TH |
509 | } |
510 | ||
511 | /** | |
512 | * sata_pmp_same_pmp - does new GSCR matches the configured PMP? | |
513 | * @dev: PMP device to compare against | |
514 | * @new_gscr: GSCR block of the new device | |
515 | * | |
516 | * Compare @new_gscr against @dev and determine whether @dev is | |
517 | * the PMP described by @new_gscr. | |
518 | * | |
519 | * LOCKING: | |
520 | * None. | |
521 | * | |
522 | * RETURNS: | |
523 | * 1 if @dev matches @new_gscr, 0 otherwise. | |
524 | */ | |
525 | static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr) | |
526 | { | |
527 | const u32 *old_gscr = dev->gscr; | |
528 | u16 old_vendor, new_vendor, old_devid, new_devid; | |
529 | int old_nr_ports, new_nr_ports; | |
530 | ||
531 | old_vendor = sata_pmp_gscr_vendor(old_gscr); | |
532 | new_vendor = sata_pmp_gscr_vendor(new_gscr); | |
533 | old_devid = sata_pmp_gscr_devid(old_gscr); | |
534 | new_devid = sata_pmp_gscr_devid(new_gscr); | |
535 | old_nr_ports = sata_pmp_gscr_ports(old_gscr); | |
536 | new_nr_ports = sata_pmp_gscr_ports(new_gscr); | |
537 | ||
538 | if (old_vendor != new_vendor) { | |
539 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier " | |
540 | "vendor mismatch '0x%x' != '0x%x'\n", | |
541 | old_vendor, new_vendor); | |
542 | return 0; | |
543 | } | |
544 | ||
545 | if (old_devid != new_devid) { | |
546 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier " | |
547 | "device ID mismatch '0x%x' != '0x%x'\n", | |
548 | old_devid, new_devid); | |
549 | return 0; | |
550 | } | |
551 | ||
552 | if (old_nr_ports != new_nr_ports) { | |
553 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier " | |
554 | "nr_ports mismatch '0x%x' != '0x%x'\n", | |
555 | old_nr_ports, new_nr_ports); | |
556 | return 0; | |
557 | } | |
558 | ||
559 | return 1; | |
560 | } | |
561 | ||
562 | /** | |
563 | * sata_pmp_revalidate - revalidate SATA PMP | |
564 | * @dev: PMP device to revalidate | |
565 | * @new_class: new class code | |
566 | * | |
567 | * Re-read GSCR block and make sure @dev is still attached to the | |
568 | * port and properly configured. | |
569 | * | |
570 | * LOCKING: | |
571 | * Kernel thread context (may sleep). | |
572 | * | |
573 | * RETURNS: | |
574 | * 0 on success, -errno otherwise. | |
575 | */ | |
576 | static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class) | |
577 | { | |
578 | struct ata_link *link = dev->link; | |
579 | struct ata_port *ap = link->ap; | |
580 | u32 *gscr = (void *)ap->sector_buf; | |
581 | int rc; | |
582 | ||
583 | DPRINTK("ENTER\n"); | |
584 | ||
585 | ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE); | |
586 | ||
587 | if (!ata_dev_enabled(dev)) { | |
588 | rc = -ENODEV; | |
589 | goto fail; | |
590 | } | |
591 | ||
592 | /* wrong class? */ | |
593 | if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) { | |
594 | rc = -ENODEV; | |
595 | goto fail; | |
596 | } | |
597 | ||
598 | /* read GSCR */ | |
599 | rc = sata_pmp_read_gscr(dev, gscr); | |
600 | if (rc) | |
601 | goto fail; | |
602 | ||
603 | /* is the pmp still there? */ | |
604 | if (!sata_pmp_same_pmp(dev, gscr)) { | |
605 | rc = -ENODEV; | |
606 | goto fail; | |
607 | } | |
608 | ||
609 | memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS); | |
610 | ||
611 | rc = sata_pmp_configure(dev, 0); | |
612 | if (rc) | |
613 | goto fail; | |
614 | ||
615 | ata_eh_done(link, NULL, ATA_EH_REVALIDATE); | |
616 | ||
617 | DPRINTK("EXIT, rc=0\n"); | |
618 | return 0; | |
619 | ||
620 | fail: | |
621 | ata_dev_printk(dev, KERN_ERR, | |
622 | "PMP revalidation failed (errno=%d)\n", rc); | |
623 | DPRINTK("EXIT, rc=%d\n", rc); | |
624 | return rc; | |
625 | } | |
626 | ||
627 | /** | |
628 | * sata_pmp_revalidate_quick - revalidate SATA PMP quickly | |
629 | * @dev: PMP device to revalidate | |
630 | * | |
631 | * Make sure the attached PMP is accessible. | |
632 | * | |
633 | * LOCKING: | |
634 | * Kernel thread context (may sleep). | |
635 | * | |
636 | * RETURNS: | |
637 | * 0 on success, -errno otherwise. | |
638 | */ | |
639 | static int sata_pmp_revalidate_quick(struct ata_device *dev) | |
640 | { | |
b06ce3e5 | 641 | unsigned int err_mask; |
3af9a77a | 642 | u32 prod_id; |
3af9a77a | 643 | |
b06ce3e5 TH |
644 | err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id); |
645 | if (err_mask) { | |
646 | ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID " | |
647 | "(Emask=0x%x)\n", err_mask); | |
648 | return -EIO; | |
3af9a77a TH |
649 | } |
650 | ||
651 | if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) { | |
652 | ata_dev_printk(dev, KERN_ERR, "PMP product ID mismatch\n"); | |
653 | /* something weird is going on, request full PMP recovery */ | |
654 | return -EIO; | |
655 | } | |
656 | ||
657 | return 0; | |
658 | } | |
659 | ||
660 | /** | |
661 | * sata_pmp_eh_recover_pmp - recover PMP | |
662 | * @ap: ATA port PMP is attached to | |
663 | * @prereset: prereset method (can be NULL) | |
664 | * @softreset: softreset method | |
665 | * @hardreset: hardreset method | |
666 | * @postreset: postreset method (can be NULL) | |
667 | * | |
668 | * Recover PMP attached to @ap. Recovery procedure is somewhat | |
669 | * similar to that of ata_eh_recover() except that reset should | |
670 | * always be performed in hard->soft sequence and recovery | |
671 | * failure results in PMP detachment. | |
672 | * | |
673 | * LOCKING: | |
674 | * Kernel thread context (may sleep). | |
675 | * | |
676 | * RETURNS: | |
677 | * 0 on success, -errno on failure. | |
678 | */ | |
679 | static int sata_pmp_eh_recover_pmp(struct ata_port *ap, | |
680 | ata_prereset_fn_t prereset, ata_reset_fn_t softreset, | |
681 | ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) | |
682 | { | |
683 | struct ata_link *link = &ap->link; | |
684 | struct ata_eh_context *ehc = &link->eh_context; | |
685 | struct ata_device *dev = link->device; | |
686 | int tries = ATA_EH_PMP_TRIES; | |
687 | int detach = 0, rc = 0; | |
688 | int reval_failed = 0; | |
689 | ||
690 | DPRINTK("ENTER\n"); | |
691 | ||
692 | if (dev->flags & ATA_DFLAG_DETACH) { | |
693 | detach = 1; | |
694 | goto fail; | |
695 | } | |
696 | ||
697 | retry: | |
698 | ehc->classes[0] = ATA_DEV_UNKNOWN; | |
699 | ||
cf480626 | 700 | if (ehc->i.action & ATA_EH_RESET) { |
3af9a77a TH |
701 | struct ata_link *tlink; |
702 | ||
703 | ata_eh_freeze_port(ap); | |
704 | ||
705 | /* reset */ | |
3af9a77a TH |
706 | rc = ata_eh_reset(link, 0, prereset, softreset, hardreset, |
707 | postreset); | |
708 | if (rc) { | |
709 | ata_link_printk(link, KERN_ERR, | |
710 | "failed to reset PMP, giving up\n"); | |
711 | goto fail; | |
712 | } | |
713 | ||
714 | ata_eh_thaw_port(ap); | |
715 | ||
716 | /* PMP is reset, SErrors cannot be trusted, scan all */ | |
b558eddd TH |
717 | ata_port_for_each_link(tlink, ap) { |
718 | struct ata_eh_context *ehc = &tlink->eh_context; | |
719 | ||
720 | ehc->i.probe_mask |= ATA_ALL_DEVICES; | |
721 | ehc->i.action |= ATA_EH_RESET; | |
722 | } | |
3af9a77a TH |
723 | } |
724 | ||
725 | /* If revalidation is requested, revalidate and reconfigure; | |
726 | * otherwise, do quick revalidation. | |
727 | */ | |
728 | if (ehc->i.action & ATA_EH_REVALIDATE) | |
729 | rc = sata_pmp_revalidate(dev, ehc->classes[0]); | |
730 | else | |
731 | rc = sata_pmp_revalidate_quick(dev); | |
732 | ||
733 | if (rc) { | |
734 | tries--; | |
735 | ||
736 | if (rc == -ENODEV) { | |
b558eddd | 737 | ehc->i.probe_mask |= ATA_ALL_DEVICES; |
3af9a77a TH |
738 | detach = 1; |
739 | /* give it just two more chances */ | |
740 | tries = min(tries, 2); | |
741 | } | |
742 | ||
743 | if (tries) { | |
744 | int sleep = ehc->i.flags & ATA_EHI_DID_RESET; | |
745 | ||
746 | /* consecutive revalidation failures? speed down */ | |
747 | if (reval_failed) | |
748 | sata_down_spd_limit(link); | |
749 | else | |
750 | reval_failed = 1; | |
751 | ||
752 | ata_dev_printk(dev, KERN_WARNING, | |
cf480626 | 753 | "retrying reset%s\n", |
3af9a77a TH |
754 | sleep ? " in 5 secs" : ""); |
755 | if (sleep) | |
756 | ssleep(5); | |
cf480626 | 757 | ehc->i.action |= ATA_EH_RESET; |
3af9a77a TH |
758 | goto retry; |
759 | } else { | |
760 | ata_dev_printk(dev, KERN_ERR, "failed to recover PMP " | |
761 | "after %d tries, giving up\n", | |
762 | ATA_EH_PMP_TRIES); | |
763 | goto fail; | |
764 | } | |
765 | } | |
766 | ||
767 | /* okay, PMP resurrected */ | |
768 | ehc->i.flags = 0; | |
769 | ||
770 | DPRINTK("EXIT, rc=0\n"); | |
771 | return 0; | |
772 | ||
773 | fail: | |
774 | sata_pmp_detach(dev); | |
775 | if (detach) | |
776 | ata_eh_detach_dev(dev); | |
777 | else | |
778 | ata_dev_disable(dev); | |
779 | ||
780 | DPRINTK("EXIT, rc=%d\n", rc); | |
781 | return rc; | |
782 | } | |
783 | ||
784 | static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap) | |
785 | { | |
786 | struct ata_link *link; | |
787 | unsigned long flags; | |
788 | int rc; | |
789 | ||
790 | spin_lock_irqsave(ap->lock, flags); | |
791 | ||
792 | ata_port_for_each_link(link, ap) { | |
793 | if (!(link->flags & ATA_LFLAG_DISABLED)) | |
794 | continue; | |
795 | ||
796 | spin_unlock_irqrestore(ap->lock, flags); | |
797 | ||
798 | /* Some PMPs require hardreset sequence to get | |
799 | * SError.N working. | |
800 | */ | |
cf480626 | 801 | sata_link_hardreset(link, sata_deb_timing_normal, |
9dadd45b | 802 | jiffies + ATA_TMOUT_INTERNAL_QUICK, NULL, NULL); |
3af9a77a TH |
803 | |
804 | /* unconditionally clear SError.N */ | |
805 | rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG); | |
806 | if (rc) { | |
807 | ata_link_printk(link, KERN_ERR, "failed to clear " | |
808 | "SError.N (errno=%d)\n", rc); | |
809 | return rc; | |
810 | } | |
811 | ||
812 | spin_lock_irqsave(ap->lock, flags); | |
813 | } | |
814 | ||
815 | spin_unlock_irqrestore(ap->lock, flags); | |
816 | ||
817 | return 0; | |
818 | } | |
819 | ||
820 | static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries) | |
821 | { | |
822 | struct ata_port *ap = link->ap; | |
823 | unsigned long flags; | |
824 | ||
825 | if (link_tries[link->pmp] && --link_tries[link->pmp]) | |
826 | return 1; | |
827 | ||
828 | /* disable this link */ | |
829 | if (!(link->flags & ATA_LFLAG_DISABLED)) { | |
830 | ata_link_printk(link, KERN_WARNING, | |
831 | "failed to recover link after %d tries, disabling\n", | |
832 | ATA_EH_PMP_LINK_TRIES); | |
833 | ||
834 | spin_lock_irqsave(ap->lock, flags); | |
835 | link->flags |= ATA_LFLAG_DISABLED; | |
836 | spin_unlock_irqrestore(ap->lock, flags); | |
837 | } | |
838 | ||
839 | ata_dev_disable(link->device); | |
840 | link->eh_context.i.action = 0; | |
841 | ||
842 | return 0; | |
843 | } | |
844 | ||
845 | /** | |
846 | * sata_pmp_eh_recover - recover PMP-enabled port | |
847 | * @ap: ATA port to recover | |
3af9a77a TH |
848 | * |
849 | * Drive EH recovery operation for PMP enabled port @ap. This | |
850 | * function recovers host and PMP ports with proper retrials and | |
851 | * fallbacks. Actual recovery operations are performed using | |
852 | * ata_eh_recover() and sata_pmp_eh_recover_pmp(). | |
853 | * | |
854 | * LOCKING: | |
855 | * Kernel thread context (may sleep). | |
856 | * | |
857 | * RETURNS: | |
858 | * 0 on success, -errno on failure. | |
859 | */ | |
a1efdaba | 860 | static int sata_pmp_eh_recover(struct ata_port *ap) |
3af9a77a | 861 | { |
a1efdaba | 862 | struct ata_port_operations *ops = ap->ops; |
3af9a77a TH |
863 | int pmp_tries, link_tries[SATA_PMP_MAX_PORTS]; |
864 | struct ata_link *pmp_link = &ap->link; | |
865 | struct ata_device *pmp_dev = pmp_link->device; | |
866 | struct ata_eh_context *pmp_ehc = &pmp_link->eh_context; | |
867 | struct ata_link *link; | |
868 | struct ata_device *dev; | |
b06ce3e5 | 869 | unsigned int err_mask; |
3af9a77a TH |
870 | u32 gscr_error, sntf; |
871 | int cnt, rc; | |
872 | ||
873 | pmp_tries = ATA_EH_PMP_TRIES; | |
874 | ata_port_for_each_link(link, ap) | |
875 | link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; | |
876 | ||
877 | retry: | |
878 | /* PMP attached? */ | |
879 | if (!ap->nr_pmp_links) { | |
a1efdaba TH |
880 | rc = ata_eh_recover(ap, ops->prereset, ops->softreset, |
881 | ops->hardreset, ops->postreset, NULL); | |
3af9a77a TH |
882 | if (rc) { |
883 | ata_link_for_each_dev(dev, &ap->link) | |
884 | ata_dev_disable(dev); | |
885 | return rc; | |
886 | } | |
887 | ||
888 | if (pmp_dev->class != ATA_DEV_PMP) | |
889 | return 0; | |
890 | ||
891 | /* new PMP online */ | |
892 | ata_port_for_each_link(link, ap) | |
893 | link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; | |
894 | ||
895 | /* fall through */ | |
896 | } | |
897 | ||
898 | /* recover pmp */ | |
a1efdaba TH |
899 | rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset, |
900 | ops->hardreset, ops->postreset); | |
3af9a77a TH |
901 | if (rc) |
902 | goto pmp_fail; | |
903 | ||
904 | /* handle disabled links */ | |
905 | rc = sata_pmp_eh_handle_disabled_links(ap); | |
906 | if (rc) | |
907 | goto pmp_fail; | |
908 | ||
909 | /* recover links */ | |
a1efdaba TH |
910 | rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset, |
911 | ops->pmp_hardreset, ops->pmp_postreset, &link); | |
3af9a77a TH |
912 | if (rc) |
913 | goto link_fail; | |
914 | ||
915 | /* Connection status might have changed while resetting other | |
916 | * links, check SATA_PMP_GSCR_ERROR before returning. | |
917 | */ | |
918 | ||
919 | /* clear SNotification */ | |
920 | rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf); | |
921 | if (rc == 0) | |
922 | sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf); | |
923 | ||
924 | /* enable notification */ | |
925 | if (pmp_dev->flags & ATA_DFLAG_AN) { | |
926 | pmp_dev->gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY; | |
927 | ||
b06ce3e5 TH |
928 | err_mask = sata_pmp_write(pmp_dev->link, SATA_PMP_GSCR_FEAT_EN, |
929 | pmp_dev->gscr[SATA_PMP_GSCR_FEAT_EN]); | |
930 | if (err_mask) { | |
931 | ata_dev_printk(pmp_dev, KERN_ERR, "failed to write " | |
932 | "PMP_FEAT_EN (Emask=0x%x)\n", err_mask); | |
933 | rc = -EIO; | |
3af9a77a TH |
934 | goto pmp_fail; |
935 | } | |
936 | } | |
937 | ||
938 | /* check GSCR_ERROR */ | |
b06ce3e5 TH |
939 | err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error); |
940 | if (err_mask) { | |
941 | ata_dev_printk(pmp_dev, KERN_ERR, "failed to read " | |
942 | "PMP_GSCR_ERROR (Emask=0x%x)\n", err_mask); | |
943 | rc = -EIO; | |
3af9a77a TH |
944 | goto pmp_fail; |
945 | } | |
946 | ||
947 | cnt = 0; | |
948 | ata_port_for_each_link(link, ap) { | |
949 | if (!(gscr_error & (1 << link->pmp))) | |
950 | continue; | |
951 | ||
952 | if (sata_pmp_handle_link_fail(link, link_tries)) { | |
953 | ata_ehi_hotplugged(&link->eh_context.i); | |
954 | cnt++; | |
955 | } else { | |
956 | ata_link_printk(link, KERN_WARNING, | |
957 | "PHY status changed but maxed out on retries, " | |
958 | "giving up\n"); | |
959 | ata_link_printk(link, KERN_WARNING, | |
960 | "Manully issue scan to resume this link\n"); | |
961 | } | |
962 | } | |
963 | ||
964 | if (cnt) { | |
965 | ata_port_printk(ap, KERN_INFO, "PMP SError.N set for some " | |
966 | "ports, repeating recovery\n"); | |
967 | goto retry; | |
968 | } | |
969 | ||
970 | return 0; | |
971 | ||
972 | link_fail: | |
973 | if (sata_pmp_handle_link_fail(link, link_tries)) { | |
cf480626 | 974 | pmp_ehc->i.action |= ATA_EH_RESET; |
3af9a77a TH |
975 | goto retry; |
976 | } | |
977 | ||
978 | /* fall through */ | |
979 | pmp_fail: | |
980 | /* Control always ends up here after detaching PMP. Shut up | |
981 | * and return if we're unloading. | |
982 | */ | |
983 | if (ap->pflags & ATA_PFLAG_UNLOADING) | |
984 | return rc; | |
985 | ||
986 | if (!ap->nr_pmp_links) | |
987 | goto retry; | |
988 | ||
989 | if (--pmp_tries) { | |
990 | ata_port_printk(ap, KERN_WARNING, | |
991 | "failed to recover PMP, retrying in 5 secs\n"); | |
cf480626 | 992 | pmp_ehc->i.action |= ATA_EH_RESET; |
3af9a77a TH |
993 | ssleep(5); |
994 | goto retry; | |
995 | } | |
996 | ||
997 | ata_port_printk(ap, KERN_ERR, | |
998 | "failed to recover PMP after %d tries, giving up\n", | |
999 | ATA_EH_PMP_TRIES); | |
1000 | sata_pmp_detach(pmp_dev); | |
1001 | ata_dev_disable(pmp_dev); | |
1002 | ||
1003 | return rc; | |
1004 | } | |
1005 | ||
1006 | /** | |
a1efdaba | 1007 | * sata_pmp_error_handler - do standard error handling for PMP-enabled host |
3af9a77a | 1008 | * @ap: host port to handle error for |
3af9a77a TH |
1009 | * |
1010 | * Perform standard error handling sequence for PMP-enabled host | |
1011 | * @ap. | |
1012 | * | |
1013 | * LOCKING: | |
1014 | * Kernel thread context (may sleep). | |
1015 | */ | |
a1efdaba | 1016 | void sata_pmp_error_handler(struct ata_port *ap) |
3af9a77a TH |
1017 | { |
1018 | ata_eh_autopsy(ap); | |
1019 | ata_eh_report(ap); | |
a1efdaba | 1020 | sata_pmp_eh_recover(ap); |
3af9a77a TH |
1021 | ata_eh_finish(ap); |
1022 | } | |
48515f6c TH |
1023 | |
1024 | EXPORT_SYMBOL_GPL(sata_pmp_port_ops); | |
1025 | EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch); | |
1026 | EXPORT_SYMBOL_GPL(sata_pmp_error_handler); |