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