Commit | Line | Data |
---|---|---|
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, | |
bf1bff6f | 51 | SATA_PMP_RW_TIMEOUT); |
b06ce3e5 TH |
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, | |
bf1bff6f | 91 | SATA_PMP_RW_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 | ||
deeb003e SH |
224 | if (rev & (1 << 3)) |
225 | return "1.2"; | |
3af9a77a TH |
226 | if (rev & (1 << 2)) |
227 | return "1.1"; | |
228 | if (rev & (1 << 1)) | |
229 | return "1.0"; | |
230 | return "<unknown>"; | |
231 | } | |
232 | ||
233 | static int sata_pmp_configure(struct ata_device *dev, int print_info) | |
234 | { | |
235 | struct ata_port *ap = dev->link->ap; | |
236 | u32 *gscr = dev->gscr; | |
b06ce3e5 | 237 | unsigned int err_mask = 0; |
3af9a77a TH |
238 | const char *reason; |
239 | int nr_ports, rc; | |
240 | ||
241 | nr_ports = sata_pmp_gscr_ports(gscr); | |
242 | ||
243 | if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) { | |
244 | rc = -EINVAL; | |
245 | reason = "invalid nr_ports"; | |
246 | goto fail; | |
247 | } | |
248 | ||
249 | if ((ap->flags & ATA_FLAG_AN) && | |
250 | (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY)) | |
251 | dev->flags |= ATA_DFLAG_AN; | |
252 | ||
253 | /* monitor SERR_PHYRDY_CHG on fan-out ports */ | |
b06ce3e5 TH |
254 | err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN, |
255 | SERR_PHYRDY_CHG); | |
256 | if (err_mask) { | |
257 | rc = -EIO; | |
3af9a77a TH |
258 | reason = "failed to write GSCR_ERROR_EN"; |
259 | goto fail; | |
260 | } | |
261 | ||
3af9a77a TH |
262 | if (print_info) { |
263 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier %s, " | |
264 | "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n", | |
265 | sata_pmp_spec_rev_str(gscr), | |
266 | sata_pmp_gscr_vendor(gscr), | |
267 | sata_pmp_gscr_devid(gscr), | |
268 | sata_pmp_gscr_rev(gscr), | |
269 | nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN], | |
270 | gscr[SATA_PMP_GSCR_FEAT]); | |
271 | ||
272 | if (!(dev->flags & ATA_DFLAG_AN)) | |
273 | ata_dev_printk(dev, KERN_INFO, | |
274 | "Asynchronous notification not supported, " | |
275 | "hotplug won't\n work on fan-out " | |
276 | "ports. Use warm-plug instead.\n"); | |
277 | } | |
278 | ||
279 | return 0; | |
280 | ||
281 | fail: | |
282 | ata_dev_printk(dev, KERN_ERR, | |
b06ce3e5 TH |
283 | "failed to configure Port Multiplier (%s, Emask=0x%x)\n", |
284 | reason, err_mask); | |
3af9a77a TH |
285 | return rc; |
286 | } | |
287 | ||
288 | static int sata_pmp_init_links(struct ata_port *ap, int nr_ports) | |
289 | { | |
290 | struct ata_link *pmp_link = ap->pmp_link; | |
291 | int i; | |
292 | ||
293 | if (!pmp_link) { | |
294 | pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS, | |
295 | GFP_NOIO); | |
296 | if (!pmp_link) | |
297 | return -ENOMEM; | |
298 | ||
299 | for (i = 0; i < SATA_PMP_MAX_PORTS; i++) | |
300 | ata_link_init(ap, &pmp_link[i], i); | |
301 | ||
302 | ap->pmp_link = pmp_link; | |
303 | } | |
304 | ||
305 | for (i = 0; i < nr_ports; i++) { | |
306 | struct ata_link *link = &pmp_link[i]; | |
307 | struct ata_eh_context *ehc = &link->eh_context; | |
308 | ||
309 | link->flags = 0; | |
b558eddd | 310 | ehc->i.probe_mask |= ATA_ALL_DEVICES; |
cf480626 | 311 | ehc->i.action |= ATA_EH_RESET; |
3af9a77a TH |
312 | } |
313 | ||
314 | return 0; | |
315 | } | |
316 | ||
317 | static void sata_pmp_quirks(struct ata_port *ap) | |
318 | { | |
319 | u32 *gscr = ap->link.device->gscr; | |
320 | u16 vendor = sata_pmp_gscr_vendor(gscr); | |
321 | u16 devid = sata_pmp_gscr_devid(gscr); | |
322 | struct ata_link *link; | |
323 | ||
324 | if (vendor == 0x1095 && devid == 0x3726) { | |
325 | /* sil3726 quirks */ | |
1eca4365 | 326 | ata_for_each_link(link, ap, EDGE) { |
19ef9d5e TH |
327 | /* Class code report is unreliable and SRST |
328 | * times out under certain configurations. | |
329 | */ | |
3af9a77a | 330 | if (link->pmp < 5) |
19ef9d5e TH |
331 | link->flags |= ATA_LFLAG_NO_SRST | |
332 | ATA_LFLAG_ASSUME_ATA; | |
3af9a77a TH |
333 | |
334 | /* port 5 is for SEMB device and it doesn't like SRST */ | |
335 | if (link->pmp == 5) | |
336 | link->flags |= ATA_LFLAG_NO_SRST | | |
337 | ATA_LFLAG_ASSUME_SEMB; | |
338 | } | |
339 | } else if (vendor == 0x1095 && devid == 0x4723) { | |
340 | /* sil4723 quirks */ | |
1eca4365 | 341 | ata_for_each_link(link, ap, EDGE) { |
3af9a77a TH |
342 | /* class code report is unreliable */ |
343 | if (link->pmp < 2) | |
344 | link->flags |= ATA_LFLAG_ASSUME_ATA; | |
345 | ||
346 | /* the config device at port 2 locks up on SRST */ | |
347 | if (link->pmp == 2) | |
348 | link->flags |= ATA_LFLAG_NO_SRST | | |
349 | ATA_LFLAG_ASSUME_ATA; | |
350 | } | |
351 | } else if (vendor == 0x1095 && devid == 0x4726) { | |
352 | /* sil4726 quirks */ | |
1eca4365 | 353 | ata_for_each_link(link, ap, EDGE) { |
8048307d TH |
354 | /* Class code report is unreliable and SRST |
355 | * times out under certain configurations. | |
356 | * Config device can be at port 0 or 5 and | |
357 | * locks up on SRST. | |
3af9a77a | 358 | */ |
8048307d | 359 | if (link->pmp <= 5) |
3af9a77a TH |
360 | link->flags |= ATA_LFLAG_NO_SRST | |
361 | ATA_LFLAG_ASSUME_ATA; | |
362 | ||
363 | /* Port 6 is for SEMB device which doesn't | |
364 | * like SRST either. | |
365 | */ | |
366 | if (link->pmp == 6) | |
367 | link->flags |= ATA_LFLAG_NO_SRST | | |
368 | ATA_LFLAG_ASSUME_SEMB; | |
369 | } | |
370 | } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 || | |
371 | devid == 0x5734 || devid == 0x5744)) { | |
372 | /* sil5723/5744 quirks */ | |
373 | ||
374 | /* sil5723/5744 has either two or three downstream | |
375 | * ports depending on operation mode. The last port | |
376 | * is empty if any actual IO device is available or | |
377 | * occupied by a pseudo configuration device | |
378 | * otherwise. Don't try hard to recover it. | |
379 | */ | |
380 | ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY; | |
3af9a77a TH |
381 | } |
382 | } | |
383 | ||
384 | /** | |
385 | * sata_pmp_attach - attach a SATA PMP device | |
386 | * @dev: SATA PMP device to attach | |
387 | * | |
388 | * Configure and attach SATA PMP device @dev. This function is | |
389 | * also responsible for allocating and initializing PMP links. | |
390 | * | |
391 | * LOCKING: | |
392 | * Kernel thread context (may sleep). | |
393 | * | |
394 | * RETURNS: | |
395 | * 0 on success, -errno on failure. | |
396 | */ | |
397 | int sata_pmp_attach(struct ata_device *dev) | |
398 | { | |
399 | struct ata_link *link = dev->link; | |
400 | struct ata_port *ap = link->ap; | |
401 | unsigned long flags; | |
402 | struct ata_link *tlink; | |
403 | int rc; | |
404 | ||
405 | /* is it hanging off the right place? */ | |
071f44b1 | 406 | if (!sata_pmp_supported(ap)) { |
3af9a77a TH |
407 | ata_dev_printk(dev, KERN_ERR, |
408 | "host does not support Port Multiplier\n"); | |
409 | return -EINVAL; | |
410 | } | |
411 | ||
412 | if (!ata_is_host_link(link)) { | |
413 | ata_dev_printk(dev, KERN_ERR, | |
414 | "Port Multipliers cannot be nested\n"); | |
415 | return -EINVAL; | |
416 | } | |
417 | ||
418 | if (dev->devno) { | |
419 | ata_dev_printk(dev, KERN_ERR, | |
420 | "Port Multiplier must be the first device\n"); | |
421 | return -EINVAL; | |
422 | } | |
423 | ||
424 | WARN_ON(link->pmp != 0); | |
425 | link->pmp = SATA_PMP_CTRL_PORT; | |
426 | ||
427 | /* read GSCR block */ | |
428 | rc = sata_pmp_read_gscr(dev, dev->gscr); | |
429 | if (rc) | |
430 | goto fail; | |
431 | ||
432 | /* config PMP */ | |
433 | rc = sata_pmp_configure(dev, 1); | |
434 | if (rc) | |
435 | goto fail; | |
436 | ||
437 | rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr)); | |
438 | if (rc) { | |
439 | ata_dev_printk(dev, KERN_INFO, | |
440 | "failed to initialize PMP links\n"); | |
441 | goto fail; | |
442 | } | |
443 | ||
444 | /* attach it */ | |
445 | spin_lock_irqsave(ap->lock, flags); | |
446 | WARN_ON(ap->nr_pmp_links); | |
447 | ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr); | |
448 | spin_unlock_irqrestore(ap->lock, flags); | |
449 | ||
450 | sata_pmp_quirks(ap); | |
451 | ||
452 | if (ap->ops->pmp_attach) | |
453 | ap->ops->pmp_attach(ap); | |
454 | ||
1eca4365 | 455 | ata_for_each_link(tlink, ap, EDGE) |
3af9a77a TH |
456 | sata_link_init_spd(tlink); |
457 | ||
d0df8b5d TH |
458 | ata_acpi_associate_sata_port(ap); |
459 | ||
3af9a77a TH |
460 | return 0; |
461 | ||
462 | fail: | |
463 | link->pmp = 0; | |
464 | return rc; | |
465 | } | |
466 | ||
467 | /** | |
468 | * sata_pmp_detach - detach a SATA PMP device | |
469 | * @dev: SATA PMP device to detach | |
470 | * | |
471 | * Detach SATA PMP device @dev. This function is also | |
472 | * responsible for deconfiguring PMP links. | |
473 | * | |
474 | * LOCKING: | |
475 | * Kernel thread context (may sleep). | |
476 | */ | |
477 | static void sata_pmp_detach(struct ata_device *dev) | |
478 | { | |
479 | struct ata_link *link = dev->link; | |
480 | struct ata_port *ap = link->ap; | |
481 | struct ata_link *tlink; | |
482 | unsigned long flags; | |
483 | ||
484 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier detaching\n"); | |
485 | ||
486 | WARN_ON(!ata_is_host_link(link) || dev->devno || | |
487 | link->pmp != SATA_PMP_CTRL_PORT); | |
488 | ||
489 | if (ap->ops->pmp_detach) | |
490 | ap->ops->pmp_detach(ap); | |
491 | ||
1eca4365 | 492 | ata_for_each_link(tlink, ap, EDGE) |
3af9a77a TH |
493 | ata_eh_detach_dev(tlink->device); |
494 | ||
495 | spin_lock_irqsave(ap->lock, flags); | |
496 | ap->nr_pmp_links = 0; | |
497 | link->pmp = 0; | |
498 | spin_unlock_irqrestore(ap->lock, flags); | |
d0df8b5d TH |
499 | |
500 | ata_acpi_associate_sata_port(ap); | |
3af9a77a TH |
501 | } |
502 | ||
503 | /** | |
504 | * sata_pmp_same_pmp - does new GSCR matches the configured PMP? | |
505 | * @dev: PMP device to compare against | |
506 | * @new_gscr: GSCR block of the new device | |
507 | * | |
508 | * Compare @new_gscr against @dev and determine whether @dev is | |
509 | * the PMP described by @new_gscr. | |
510 | * | |
511 | * LOCKING: | |
512 | * None. | |
513 | * | |
514 | * RETURNS: | |
515 | * 1 if @dev matches @new_gscr, 0 otherwise. | |
516 | */ | |
517 | static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr) | |
518 | { | |
519 | const u32 *old_gscr = dev->gscr; | |
520 | u16 old_vendor, new_vendor, old_devid, new_devid; | |
521 | int old_nr_ports, new_nr_ports; | |
522 | ||
523 | old_vendor = sata_pmp_gscr_vendor(old_gscr); | |
524 | new_vendor = sata_pmp_gscr_vendor(new_gscr); | |
525 | old_devid = sata_pmp_gscr_devid(old_gscr); | |
526 | new_devid = sata_pmp_gscr_devid(new_gscr); | |
527 | old_nr_ports = sata_pmp_gscr_ports(old_gscr); | |
528 | new_nr_ports = sata_pmp_gscr_ports(new_gscr); | |
529 | ||
530 | if (old_vendor != new_vendor) { | |
531 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier " | |
532 | "vendor mismatch '0x%x' != '0x%x'\n", | |
533 | old_vendor, new_vendor); | |
534 | return 0; | |
535 | } | |
536 | ||
537 | if (old_devid != new_devid) { | |
538 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier " | |
539 | "device ID mismatch '0x%x' != '0x%x'\n", | |
540 | old_devid, new_devid); | |
541 | return 0; | |
542 | } | |
543 | ||
544 | if (old_nr_ports != new_nr_ports) { | |
545 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier " | |
546 | "nr_ports mismatch '0x%x' != '0x%x'\n", | |
547 | old_nr_ports, new_nr_ports); | |
548 | return 0; | |
549 | } | |
550 | ||
551 | return 1; | |
552 | } | |
553 | ||
554 | /** | |
555 | * sata_pmp_revalidate - revalidate SATA PMP | |
556 | * @dev: PMP device to revalidate | |
557 | * @new_class: new class code | |
558 | * | |
559 | * Re-read GSCR block and make sure @dev is still attached to the | |
560 | * port and properly configured. | |
561 | * | |
562 | * LOCKING: | |
563 | * Kernel thread context (may sleep). | |
564 | * | |
565 | * RETURNS: | |
566 | * 0 on success, -errno otherwise. | |
567 | */ | |
568 | static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class) | |
569 | { | |
570 | struct ata_link *link = dev->link; | |
571 | struct ata_port *ap = link->ap; | |
572 | u32 *gscr = (void *)ap->sector_buf; | |
573 | int rc; | |
574 | ||
575 | DPRINTK("ENTER\n"); | |
576 | ||
577 | ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE); | |
578 | ||
579 | if (!ata_dev_enabled(dev)) { | |
580 | rc = -ENODEV; | |
581 | goto fail; | |
582 | } | |
583 | ||
584 | /* wrong class? */ | |
585 | if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) { | |
586 | rc = -ENODEV; | |
587 | goto fail; | |
588 | } | |
589 | ||
590 | /* read GSCR */ | |
591 | rc = sata_pmp_read_gscr(dev, gscr); | |
592 | if (rc) | |
593 | goto fail; | |
594 | ||
595 | /* is the pmp still there? */ | |
596 | if (!sata_pmp_same_pmp(dev, gscr)) { | |
597 | rc = -ENODEV; | |
598 | goto fail; | |
599 | } | |
600 | ||
601 | memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS); | |
602 | ||
603 | rc = sata_pmp_configure(dev, 0); | |
604 | if (rc) | |
605 | goto fail; | |
606 | ||
607 | ata_eh_done(link, NULL, ATA_EH_REVALIDATE); | |
608 | ||
609 | DPRINTK("EXIT, rc=0\n"); | |
610 | return 0; | |
611 | ||
612 | fail: | |
613 | ata_dev_printk(dev, KERN_ERR, | |
614 | "PMP revalidation failed (errno=%d)\n", rc); | |
615 | DPRINTK("EXIT, rc=%d\n", rc); | |
616 | return rc; | |
617 | } | |
618 | ||
619 | /** | |
620 | * sata_pmp_revalidate_quick - revalidate SATA PMP quickly | |
621 | * @dev: PMP device to revalidate | |
622 | * | |
623 | * Make sure the attached PMP is accessible. | |
624 | * | |
625 | * LOCKING: | |
626 | * Kernel thread context (may sleep). | |
627 | * | |
628 | * RETURNS: | |
629 | * 0 on success, -errno otherwise. | |
630 | */ | |
631 | static int sata_pmp_revalidate_quick(struct ata_device *dev) | |
632 | { | |
b06ce3e5 | 633 | unsigned int err_mask; |
3af9a77a | 634 | u32 prod_id; |
3af9a77a | 635 | |
b06ce3e5 TH |
636 | err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id); |
637 | if (err_mask) { | |
638 | ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID " | |
639 | "(Emask=0x%x)\n", err_mask); | |
640 | return -EIO; | |
3af9a77a TH |
641 | } |
642 | ||
643 | if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) { | |
644 | ata_dev_printk(dev, KERN_ERR, "PMP product ID mismatch\n"); | |
645 | /* something weird is going on, request full PMP recovery */ | |
646 | return -EIO; | |
647 | } | |
648 | ||
649 | return 0; | |
650 | } | |
651 | ||
652 | /** | |
653 | * sata_pmp_eh_recover_pmp - recover PMP | |
654 | * @ap: ATA port PMP is attached to | |
655 | * @prereset: prereset method (can be NULL) | |
656 | * @softreset: softreset method | |
657 | * @hardreset: hardreset method | |
658 | * @postreset: postreset method (can be NULL) | |
659 | * | |
660 | * Recover PMP attached to @ap. Recovery procedure is somewhat | |
661 | * similar to that of ata_eh_recover() except that reset should | |
662 | * always be performed in hard->soft sequence and recovery | |
663 | * failure results in PMP detachment. | |
664 | * | |
665 | * LOCKING: | |
666 | * Kernel thread context (may sleep). | |
667 | * | |
668 | * RETURNS: | |
669 | * 0 on success, -errno on failure. | |
670 | */ | |
671 | static int sata_pmp_eh_recover_pmp(struct ata_port *ap, | |
672 | ata_prereset_fn_t prereset, ata_reset_fn_t softreset, | |
673 | ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) | |
674 | { | |
675 | struct ata_link *link = &ap->link; | |
676 | struct ata_eh_context *ehc = &link->eh_context; | |
677 | struct ata_device *dev = link->device; | |
678 | int tries = ATA_EH_PMP_TRIES; | |
679 | int detach = 0, rc = 0; | |
680 | int reval_failed = 0; | |
681 | ||
682 | DPRINTK("ENTER\n"); | |
683 | ||
684 | if (dev->flags & ATA_DFLAG_DETACH) { | |
685 | detach = 1; | |
686 | goto fail; | |
687 | } | |
688 | ||
689 | retry: | |
690 | ehc->classes[0] = ATA_DEV_UNKNOWN; | |
691 | ||
cf480626 | 692 | if (ehc->i.action & ATA_EH_RESET) { |
3af9a77a TH |
693 | struct ata_link *tlink; |
694 | ||
3af9a77a | 695 | /* reset */ |
3af9a77a TH |
696 | rc = ata_eh_reset(link, 0, prereset, softreset, hardreset, |
697 | postreset); | |
698 | if (rc) { | |
699 | ata_link_printk(link, KERN_ERR, | |
700 | "failed to reset PMP, giving up\n"); | |
701 | goto fail; | |
702 | } | |
703 | ||
3af9a77a | 704 | /* PMP is reset, SErrors cannot be trusted, scan all */ |
1eca4365 | 705 | ata_for_each_link(tlink, ap, EDGE) { |
b558eddd TH |
706 | struct ata_eh_context *ehc = &tlink->eh_context; |
707 | ||
708 | ehc->i.probe_mask |= ATA_ALL_DEVICES; | |
709 | ehc->i.action |= ATA_EH_RESET; | |
710 | } | |
3af9a77a TH |
711 | } |
712 | ||
713 | /* If revalidation is requested, revalidate and reconfigure; | |
714 | * otherwise, do quick revalidation. | |
715 | */ | |
716 | if (ehc->i.action & ATA_EH_REVALIDATE) | |
717 | rc = sata_pmp_revalidate(dev, ehc->classes[0]); | |
718 | else | |
719 | rc = sata_pmp_revalidate_quick(dev); | |
720 | ||
721 | if (rc) { | |
722 | tries--; | |
723 | ||
724 | if (rc == -ENODEV) { | |
b558eddd | 725 | ehc->i.probe_mask |= ATA_ALL_DEVICES; |
3af9a77a TH |
726 | detach = 1; |
727 | /* give it just two more chances */ | |
728 | tries = min(tries, 2); | |
729 | } | |
730 | ||
731 | if (tries) { | |
3af9a77a TH |
732 | /* consecutive revalidation failures? speed down */ |
733 | if (reval_failed) | |
a07d499b | 734 | sata_down_spd_limit(link, 0); |
3af9a77a TH |
735 | else |
736 | reval_failed = 1; | |
737 | ||
cf480626 | 738 | ehc->i.action |= ATA_EH_RESET; |
3af9a77a TH |
739 | goto retry; |
740 | } else { | |
741 | ata_dev_printk(dev, KERN_ERR, "failed to recover PMP " | |
742 | "after %d tries, giving up\n", | |
743 | ATA_EH_PMP_TRIES); | |
744 | goto fail; | |
745 | } | |
746 | } | |
747 | ||
748 | /* okay, PMP resurrected */ | |
749 | ehc->i.flags = 0; | |
750 | ||
751 | DPRINTK("EXIT, rc=0\n"); | |
752 | return 0; | |
753 | ||
754 | fail: | |
755 | sata_pmp_detach(dev); | |
756 | if (detach) | |
757 | ata_eh_detach_dev(dev); | |
758 | else | |
759 | ata_dev_disable(dev); | |
760 | ||
761 | DPRINTK("EXIT, rc=%d\n", rc); | |
762 | return rc; | |
763 | } | |
764 | ||
765 | static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap) | |
766 | { | |
767 | struct ata_link *link; | |
768 | unsigned long flags; | |
769 | int rc; | |
770 | ||
771 | spin_lock_irqsave(ap->lock, flags); | |
772 | ||
1eca4365 | 773 | ata_for_each_link(link, ap, EDGE) { |
3af9a77a TH |
774 | if (!(link->flags & ATA_LFLAG_DISABLED)) |
775 | continue; | |
776 | ||
777 | spin_unlock_irqrestore(ap->lock, flags); | |
778 | ||
779 | /* Some PMPs require hardreset sequence to get | |
780 | * SError.N working. | |
781 | */ | |
cf480626 | 782 | sata_link_hardreset(link, sata_deb_timing_normal, |
341c2c95 TH |
783 | ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK), |
784 | NULL, NULL); | |
3af9a77a TH |
785 | |
786 | /* unconditionally clear SError.N */ | |
787 | rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG); | |
788 | if (rc) { | |
789 | ata_link_printk(link, KERN_ERR, "failed to clear " | |
790 | "SError.N (errno=%d)\n", rc); | |
791 | return rc; | |
792 | } | |
793 | ||
794 | spin_lock_irqsave(ap->lock, flags); | |
795 | } | |
796 | ||
797 | spin_unlock_irqrestore(ap->lock, flags); | |
798 | ||
799 | return 0; | |
800 | } | |
801 | ||
802 | static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries) | |
803 | { | |
804 | struct ata_port *ap = link->ap; | |
805 | unsigned long flags; | |
806 | ||
807 | if (link_tries[link->pmp] && --link_tries[link->pmp]) | |
808 | return 1; | |
809 | ||
810 | /* disable this link */ | |
811 | if (!(link->flags & ATA_LFLAG_DISABLED)) { | |
812 | ata_link_printk(link, KERN_WARNING, | |
813 | "failed to recover link after %d tries, disabling\n", | |
814 | ATA_EH_PMP_LINK_TRIES); | |
815 | ||
816 | spin_lock_irqsave(ap->lock, flags); | |
817 | link->flags |= ATA_LFLAG_DISABLED; | |
818 | spin_unlock_irqrestore(ap->lock, flags); | |
819 | } | |
820 | ||
821 | ata_dev_disable(link->device); | |
822 | link->eh_context.i.action = 0; | |
823 | ||
824 | return 0; | |
825 | } | |
826 | ||
827 | /** | |
828 | * sata_pmp_eh_recover - recover PMP-enabled port | |
829 | * @ap: ATA port to recover | |
3af9a77a TH |
830 | * |
831 | * Drive EH recovery operation for PMP enabled port @ap. This | |
832 | * function recovers host and PMP ports with proper retrials and | |
833 | * fallbacks. Actual recovery operations are performed using | |
834 | * ata_eh_recover() and sata_pmp_eh_recover_pmp(). | |
835 | * | |
836 | * LOCKING: | |
837 | * Kernel thread context (may sleep). | |
838 | * | |
839 | * RETURNS: | |
840 | * 0 on success, -errno on failure. | |
841 | */ | |
a1efdaba | 842 | static int sata_pmp_eh_recover(struct ata_port *ap) |
3af9a77a | 843 | { |
a1efdaba | 844 | struct ata_port_operations *ops = ap->ops; |
3af9a77a TH |
845 | int pmp_tries, link_tries[SATA_PMP_MAX_PORTS]; |
846 | struct ata_link *pmp_link = &ap->link; | |
847 | struct ata_device *pmp_dev = pmp_link->device; | |
848 | struct ata_eh_context *pmp_ehc = &pmp_link->eh_context; | |
f1bbfb90 | 849 | u32 *gscr = pmp_dev->gscr; |
3af9a77a TH |
850 | struct ata_link *link; |
851 | struct ata_device *dev; | |
b06ce3e5 | 852 | unsigned int err_mask; |
3af9a77a TH |
853 | u32 gscr_error, sntf; |
854 | int cnt, rc; | |
855 | ||
856 | pmp_tries = ATA_EH_PMP_TRIES; | |
1eca4365 | 857 | ata_for_each_link(link, ap, EDGE) |
3af9a77a TH |
858 | link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; |
859 | ||
860 | retry: | |
861 | /* PMP attached? */ | |
071f44b1 | 862 | if (!sata_pmp_attached(ap)) { |
a1efdaba TH |
863 | rc = ata_eh_recover(ap, ops->prereset, ops->softreset, |
864 | ops->hardreset, ops->postreset, NULL); | |
3af9a77a | 865 | if (rc) { |
1eca4365 | 866 | ata_for_each_dev(dev, &ap->link, ALL) |
3af9a77a TH |
867 | ata_dev_disable(dev); |
868 | return rc; | |
869 | } | |
870 | ||
871 | if (pmp_dev->class != ATA_DEV_PMP) | |
872 | return 0; | |
873 | ||
874 | /* new PMP online */ | |
1eca4365 | 875 | ata_for_each_link(link, ap, EDGE) |
3af9a77a TH |
876 | link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; |
877 | ||
878 | /* fall through */ | |
879 | } | |
880 | ||
881 | /* recover pmp */ | |
a1efdaba TH |
882 | rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset, |
883 | ops->hardreset, ops->postreset); | |
3af9a77a TH |
884 | if (rc) |
885 | goto pmp_fail; | |
886 | ||
f1bbfb90 TH |
887 | /* PHY event notification can disturb reset and other recovery |
888 | * operations. Turn it off. | |
889 | */ | |
890 | if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) { | |
891 | gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY; | |
892 | ||
893 | err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN, | |
894 | gscr[SATA_PMP_GSCR_FEAT_EN]); | |
895 | if (err_mask) { | |
896 | ata_link_printk(pmp_link, KERN_WARNING, | |
897 | "failed to disable NOTIFY (err_mask=0x%x)\n", | |
898 | err_mask); | |
899 | goto pmp_fail; | |
900 | } | |
901 | } | |
902 | ||
3af9a77a TH |
903 | /* handle disabled links */ |
904 | rc = sata_pmp_eh_handle_disabled_links(ap); | |
905 | if (rc) | |
906 | goto pmp_fail; | |
907 | ||
908 | /* recover links */ | |
a1efdaba TH |
909 | rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset, |
910 | ops->pmp_hardreset, ops->pmp_postreset, &link); | |
3af9a77a TH |
911 | if (rc) |
912 | goto link_fail; | |
913 | ||
914 | /* Connection status might have changed while resetting other | |
915 | * links, check SATA_PMP_GSCR_ERROR before returning. | |
916 | */ | |
917 | ||
918 | /* clear SNotification */ | |
919 | rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf); | |
920 | if (rc == 0) | |
921 | sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf); | |
922 | ||
923 | /* enable notification */ | |
924 | if (pmp_dev->flags & ATA_DFLAG_AN) { | |
f1bbfb90 | 925 | gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY; |
3af9a77a | 926 | |
f1bbfb90 TH |
927 | err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN, |
928 | gscr[SATA_PMP_GSCR_FEAT_EN]); | |
b06ce3e5 TH |
929 | if (err_mask) { |
930 | ata_dev_printk(pmp_dev, KERN_ERR, "failed to write " | |
931 | "PMP_FEAT_EN (Emask=0x%x)\n", err_mask); | |
932 | rc = -EIO; | |
3af9a77a TH |
933 | goto pmp_fail; |
934 | } | |
935 | } | |
936 | ||
937 | /* check GSCR_ERROR */ | |
b06ce3e5 TH |
938 | err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error); |
939 | if (err_mask) { | |
940 | ata_dev_printk(pmp_dev, KERN_ERR, "failed to read " | |
941 | "PMP_GSCR_ERROR (Emask=0x%x)\n", err_mask); | |
942 | rc = -EIO; | |
3af9a77a TH |
943 | goto pmp_fail; |
944 | } | |
945 | ||
946 | cnt = 0; | |
1eca4365 | 947 | ata_for_each_link(link, ap, EDGE) { |
3af9a77a TH |
948 | if (!(gscr_error & (1 << link->pmp))) |
949 | continue; | |
950 | ||
951 | if (sata_pmp_handle_link_fail(link, link_tries)) { | |
952 | ata_ehi_hotplugged(&link->eh_context.i); | |
953 | cnt++; | |
954 | } else { | |
955 | ata_link_printk(link, KERN_WARNING, | |
956 | "PHY status changed but maxed out on retries, " | |
957 | "giving up\n"); | |
958 | ata_link_printk(link, KERN_WARNING, | |
959 | "Manully issue scan to resume this link\n"); | |
960 | } | |
961 | } | |
962 | ||
963 | if (cnt) { | |
964 | ata_port_printk(ap, KERN_INFO, "PMP SError.N set for some " | |
965 | "ports, repeating recovery\n"); | |
966 | goto retry; | |
967 | } | |
968 | ||
969 | return 0; | |
970 | ||
971 | link_fail: | |
972 | if (sata_pmp_handle_link_fail(link, link_tries)) { | |
cf480626 | 973 | pmp_ehc->i.action |= ATA_EH_RESET; |
3af9a77a TH |
974 | goto retry; |
975 | } | |
976 | ||
977 | /* fall through */ | |
978 | pmp_fail: | |
979 | /* Control always ends up here after detaching PMP. Shut up | |
980 | * and return if we're unloading. | |
981 | */ | |
982 | if (ap->pflags & ATA_PFLAG_UNLOADING) | |
983 | return rc; | |
984 | ||
071f44b1 | 985 | if (!sata_pmp_attached(ap)) |
3af9a77a TH |
986 | goto retry; |
987 | ||
988 | if (--pmp_tries) { | |
cf480626 | 989 | pmp_ehc->i.action |= ATA_EH_RESET; |
3af9a77a TH |
990 | goto retry; |
991 | } | |
992 | ||
993 | ata_port_printk(ap, KERN_ERR, | |
994 | "failed to recover PMP after %d tries, giving up\n", | |
995 | ATA_EH_PMP_TRIES); | |
996 | sata_pmp_detach(pmp_dev); | |
997 | ata_dev_disable(pmp_dev); | |
998 | ||
999 | return rc; | |
1000 | } | |
1001 | ||
1002 | /** | |
a1efdaba | 1003 | * sata_pmp_error_handler - do standard error handling for PMP-enabled host |
3af9a77a | 1004 | * @ap: host port to handle error for |
3af9a77a TH |
1005 | * |
1006 | * Perform standard error handling sequence for PMP-enabled host | |
1007 | * @ap. | |
1008 | * | |
1009 | * LOCKING: | |
1010 | * Kernel thread context (may sleep). | |
1011 | */ | |
a1efdaba | 1012 | void sata_pmp_error_handler(struct ata_port *ap) |
3af9a77a TH |
1013 | { |
1014 | ata_eh_autopsy(ap); | |
1015 | ata_eh_report(ap); | |
a1efdaba | 1016 | sata_pmp_eh_recover(ap); |
3af9a77a TH |
1017 | ata_eh_finish(ap); |
1018 | } | |
48515f6c TH |
1019 | |
1020 | EXPORT_SYMBOL_GPL(sata_pmp_port_ops); | |
1021 | EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch); | |
1022 | EXPORT_SYMBOL_GPL(sata_pmp_error_handler); |