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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 | ||
14 | /** | |
15 | * sata_pmp_read - read PMP register | |
16 | * @link: link to read PMP register for | |
17 | * @reg: register to read | |
18 | * @r_val: resulting value | |
19 | * | |
b06ce3e5 | 20 | * Read PMP register. |
3af9a77a TH |
21 | * |
22 | * LOCKING: | |
23 | * Kernel thread context (may sleep). | |
24 | * | |
25 | * RETURNS: | |
b06ce3e5 | 26 | * 0 on success, AC_ERR_* mask on failure. |
3af9a77a | 27 | */ |
b06ce3e5 | 28 | static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val) |
3af9a77a TH |
29 | { |
30 | struct ata_port *ap = link->ap; | |
31 | struct ata_device *pmp_dev = ap->link.device; | |
b06ce3e5 TH |
32 | struct ata_taskfile tf; |
33 | unsigned int err_mask; | |
34 | ||
35 | ata_tf_init(pmp_dev, &tf); | |
36 | tf.command = ATA_CMD_PMP_READ; | |
37 | tf.protocol = ATA_PROT_NODATA; | |
39f25e70 | 38 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; |
b06ce3e5 TH |
39 | tf.feature = reg; |
40 | tf.device = link->pmp; | |
41 | ||
42 | err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0, | |
43 | SATA_PMP_SCR_TIMEOUT); | |
44 | if (err_mask) | |
45 | return err_mask; | |
46 | ||
47 | *r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24; | |
48 | return 0; | |
3af9a77a TH |
49 | } |
50 | ||
51 | /** | |
52 | * sata_pmp_write - write PMP register | |
53 | * @link: link to write PMP register for | |
54 | * @reg: register to write | |
55 | * @r_val: value to write | |
56 | * | |
b06ce3e5 | 57 | * Write PMP register. |
3af9a77a TH |
58 | * |
59 | * LOCKING: | |
60 | * Kernel thread context (may sleep). | |
61 | * | |
62 | * RETURNS: | |
b06ce3e5 | 63 | * 0 on success, AC_ERR_* mask on failure. |
3af9a77a | 64 | */ |
b06ce3e5 | 65 | static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val) |
3af9a77a TH |
66 | { |
67 | struct ata_port *ap = link->ap; | |
68 | struct ata_device *pmp_dev = ap->link.device; | |
b06ce3e5 TH |
69 | struct ata_taskfile tf; |
70 | ||
71 | ata_tf_init(pmp_dev, &tf); | |
72 | tf.command = ATA_CMD_PMP_WRITE; | |
73 | tf.protocol = ATA_PROT_NODATA; | |
39f25e70 | 74 | tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; |
b06ce3e5 TH |
75 | tf.feature = reg; |
76 | tf.device = link->pmp; | |
77 | tf.nsect = val & 0xff; | |
78 | tf.lbal = (val >> 8) & 0xff; | |
79 | tf.lbam = (val >> 16) & 0xff; | |
80 | tf.lbah = (val >> 24) & 0xff; | |
81 | ||
82 | return ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0, | |
83 | SATA_PMP_SCR_TIMEOUT); | |
3af9a77a TH |
84 | } |
85 | ||
31f88384 TH |
86 | /** |
87 | * sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP | |
88 | * @qc: ATA command in question | |
89 | * | |
90 | * A host which has command switching PMP support cannot issue | |
91 | * commands to multiple links simultaneously. | |
92 | * | |
93 | * LOCKING: | |
94 | * spin_lock_irqsave(host lock) | |
95 | * | |
96 | * RETURNS: | |
97 | * ATA_DEFER_* if deferring is needed, 0 otherwise. | |
98 | */ | |
99 | int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc) | |
100 | { | |
101 | struct ata_link *link = qc->dev->link; | |
102 | struct ata_port *ap = link->ap; | |
103 | ||
104 | if (ap->excl_link == NULL || ap->excl_link == link) { | |
105 | if (ap->nr_active_links == 0 || ata_link_active(link)) { | |
106 | qc->flags |= ATA_QCFLAG_CLEAR_EXCL; | |
107 | return ata_std_qc_defer(qc); | |
108 | } | |
109 | ||
110 | ap->excl_link = link; | |
111 | } | |
112 | ||
113 | return ATA_DEFER_PORT; | |
114 | } | |
115 | ||
3af9a77a TH |
116 | /** |
117 | * sata_pmp_scr_read - read PSCR | |
118 | * @link: ATA link to read PSCR for | |
119 | * @reg: PSCR to read | |
120 | * @r_val: resulting value | |
121 | * | |
122 | * Read PSCR @reg into @r_val for @link, to be called from | |
123 | * ata_scr_read(). | |
124 | * | |
125 | * LOCKING: | |
126 | * Kernel thread context (may sleep). | |
127 | * | |
128 | * RETURNS: | |
129 | * 0 on success, -errno on failure. | |
130 | */ | |
131 | int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val) | |
132 | { | |
b06ce3e5 TH |
133 | unsigned int err_mask; |
134 | ||
3af9a77a TH |
135 | if (reg > SATA_PMP_PSCR_CONTROL) |
136 | return -EINVAL; | |
137 | ||
b06ce3e5 TH |
138 | err_mask = sata_pmp_read(link, reg, r_val); |
139 | if (err_mask) { | |
140 | ata_link_printk(link, KERN_WARNING, "failed to read SCR %d " | |
141 | "(Emask=0x%x)\n", reg, err_mask); | |
142 | return -EIO; | |
143 | } | |
144 | return 0; | |
3af9a77a TH |
145 | } |
146 | ||
147 | /** | |
148 | * sata_pmp_scr_write - write PSCR | |
149 | * @link: ATA link to write PSCR for | |
150 | * @reg: PSCR to write | |
151 | * @val: value to be written | |
152 | * | |
153 | * Write @val to PSCR @reg for @link, to be called from | |
154 | * ata_scr_write() and ata_scr_write_flush(). | |
155 | * | |
156 | * LOCKING: | |
157 | * Kernel thread context (may sleep). | |
158 | * | |
159 | * RETURNS: | |
160 | * 0 on success, -errno on failure. | |
161 | */ | |
162 | int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val) | |
163 | { | |
b06ce3e5 TH |
164 | unsigned int err_mask; |
165 | ||
3af9a77a TH |
166 | if (reg > SATA_PMP_PSCR_CONTROL) |
167 | return -EINVAL; | |
168 | ||
b06ce3e5 TH |
169 | err_mask = sata_pmp_write(link, reg, val); |
170 | if (err_mask) { | |
171 | ata_link_printk(link, KERN_WARNING, "failed to write SCR %d " | |
172 | "(Emask=0x%x)\n", reg, err_mask); | |
173 | return -EIO; | |
174 | } | |
175 | return 0; | |
3af9a77a TH |
176 | } |
177 | ||
178 | /** | |
179 | * sata_pmp_std_prereset - prepare PMP link for reset | |
180 | * @link: link to be reset | |
181 | * @deadline: deadline jiffies for the operation | |
182 | * | |
183 | * @link is about to be reset. Initialize it. | |
184 | * | |
185 | * LOCKING: | |
186 | * Kernel thread context (may sleep) | |
187 | * | |
188 | * RETURNS: | |
189 | * 0 on success, -errno otherwise. | |
190 | */ | |
191 | int sata_pmp_std_prereset(struct ata_link *link, unsigned long deadline) | |
192 | { | |
193 | struct ata_eh_context *ehc = &link->eh_context; | |
194 | const unsigned long *timing = sata_ehc_deb_timing(ehc); | |
195 | int rc; | |
196 | ||
197 | /* force HRST? */ | |
198 | if (link->flags & ATA_LFLAG_NO_SRST) | |
199 | ehc->i.action |= ATA_EH_HARDRESET; | |
200 | ||
201 | /* handle link resume */ | |
202 | if ((ehc->i.flags & ATA_EHI_RESUME_LINK) && | |
203 | (link->flags & ATA_LFLAG_HRST_TO_RESUME)) | |
204 | ehc->i.action |= ATA_EH_HARDRESET; | |
205 | ||
206 | /* if we're about to do hardreset, nothing more to do */ | |
207 | if (ehc->i.action & ATA_EH_HARDRESET) | |
208 | return 0; | |
209 | ||
210 | /* resume link */ | |
211 | rc = sata_link_resume(link, timing, deadline); | |
212 | if (rc) { | |
213 | /* phy resume failed */ | |
214 | ata_link_printk(link, KERN_WARNING, "failed to resume link " | |
215 | "for reset (errno=%d)\n", rc); | |
216 | return rc; | |
217 | } | |
218 | ||
219 | /* clear SError bits including .X which blocks the port when set */ | |
220 | rc = sata_scr_write(link, SCR_ERROR, 0xffffffff); | |
221 | if (rc) { | |
222 | ata_link_printk(link, KERN_ERR, | |
223 | "failed to clear SError (errno=%d)\n", rc); | |
224 | return rc; | |
225 | } | |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
230 | /** | |
231 | * sata_pmp_std_hardreset - standard hardreset method for PMP link | |
232 | * @link: link to be reset | |
233 | * @class: resulting class of attached device | |
234 | * @deadline: deadline jiffies for the operation | |
235 | * | |
236 | * Hardreset PMP port @link. Note that this function doesn't | |
237 | * wait for BSY clearance. There simply isn't a generic way to | |
238 | * wait the event. Instead, this function return -EAGAIN thus | |
239 | * telling libata-EH to followup with softreset. | |
240 | * | |
241 | * LOCKING: | |
242 | * Kernel thread context (may sleep) | |
243 | * | |
244 | * RETURNS: | |
245 | * 0 on success, -errno otherwise. | |
246 | */ | |
247 | int sata_pmp_std_hardreset(struct ata_link *link, unsigned int *class, | |
248 | unsigned long deadline) | |
249 | { | |
250 | const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context); | |
251 | u32 tmp; | |
252 | int rc; | |
253 | ||
254 | DPRINTK("ENTER\n"); | |
255 | ||
256 | /* do hardreset */ | |
257 | rc = sata_link_hardreset(link, timing, deadline); | |
258 | if (rc) { | |
259 | ata_link_printk(link, KERN_ERR, | |
260 | "COMRESET failed (errno=%d)\n", rc); | |
261 | goto out; | |
262 | } | |
263 | ||
264 | /* clear SError bits including .X which blocks the port when set */ | |
265 | rc = sata_scr_write(link, SCR_ERROR, 0xffffffff); | |
266 | if (rc) { | |
267 | ata_link_printk(link, KERN_ERR, "failed to clear SError " | |
268 | "during hardreset (errno=%d)\n", rc); | |
269 | goto out; | |
270 | } | |
271 | ||
272 | /* if device is present, follow up with srst to wait for !BSY */ | |
273 | if (ata_link_online(link)) | |
274 | rc = -EAGAIN; | |
275 | out: | |
276 | /* if SCR isn't accessible, we need to reset the PMP */ | |
277 | if (rc && rc != -EAGAIN && sata_scr_read(link, SCR_STATUS, &tmp)) | |
278 | rc = -ERESTART; | |
279 | ||
280 | DPRINTK("EXIT, rc=%d\n", rc); | |
281 | return rc; | |
282 | } | |
283 | ||
284 | /** | |
285 | * ata_std_postreset - standard postreset method for PMP link | |
286 | * @link: the target ata_link | |
287 | * @classes: classes of attached devices | |
288 | * | |
289 | * This function is invoked after a successful reset. Note that | |
290 | * the device might have been reset more than once using | |
291 | * different reset methods before postreset is invoked. | |
292 | * | |
293 | * LOCKING: | |
294 | * Kernel thread context (may sleep) | |
295 | */ | |
296 | void sata_pmp_std_postreset(struct ata_link *link, unsigned int *class) | |
297 | { | |
298 | u32 serror; | |
299 | ||
300 | DPRINTK("ENTER\n"); | |
301 | ||
302 | /* clear SError */ | |
303 | if (sata_scr_read(link, SCR_ERROR, &serror) == 0) | |
304 | sata_scr_write(link, SCR_ERROR, serror); | |
305 | ||
306 | /* print link status */ | |
307 | sata_print_link_status(link); | |
308 | ||
309 | DPRINTK("EXIT\n"); | |
310 | } | |
311 | ||
312 | /** | |
313 | * sata_pmp_read_gscr - read GSCR block of SATA PMP | |
314 | * @dev: PMP device | |
315 | * @gscr: buffer to read GSCR block into | |
316 | * | |
317 | * Read selected PMP GSCRs from the PMP at @dev. This will serve | |
318 | * as configuration and identification info for the PMP. | |
319 | * | |
320 | * LOCKING: | |
321 | * Kernel thread context (may sleep). | |
322 | * | |
323 | * RETURNS: | |
324 | * 0 on success, -errno on failure. | |
325 | */ | |
326 | static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr) | |
327 | { | |
328 | static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 }; | |
b06ce3e5 | 329 | int i; |
3af9a77a TH |
330 | |
331 | for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) { | |
332 | int reg = gscr_to_read[i]; | |
b06ce3e5 | 333 | unsigned int err_mask; |
3af9a77a | 334 | |
b06ce3e5 TH |
335 | err_mask = sata_pmp_read(dev->link, reg, &gscr[reg]); |
336 | if (err_mask) { | |
337 | ata_dev_printk(dev, KERN_ERR, "failed to read PMP " | |
338 | "GSCR[%d] (Emask=0x%x)\n", reg, err_mask); | |
339 | return -EIO; | |
3af9a77a TH |
340 | } |
341 | } | |
342 | ||
343 | return 0; | |
344 | } | |
345 | ||
346 | static const char *sata_pmp_spec_rev_str(const u32 *gscr) | |
347 | { | |
348 | u32 rev = gscr[SATA_PMP_GSCR_REV]; | |
349 | ||
350 | if (rev & (1 << 2)) | |
351 | return "1.1"; | |
352 | if (rev & (1 << 1)) | |
353 | return "1.0"; | |
354 | return "<unknown>"; | |
355 | } | |
356 | ||
357 | static int sata_pmp_configure(struct ata_device *dev, int print_info) | |
358 | { | |
359 | struct ata_port *ap = dev->link->ap; | |
360 | u32 *gscr = dev->gscr; | |
b06ce3e5 | 361 | unsigned int err_mask = 0; |
3af9a77a TH |
362 | const char *reason; |
363 | int nr_ports, rc; | |
364 | ||
365 | nr_ports = sata_pmp_gscr_ports(gscr); | |
366 | ||
367 | if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) { | |
368 | rc = -EINVAL; | |
369 | reason = "invalid nr_ports"; | |
370 | goto fail; | |
371 | } | |
372 | ||
373 | if ((ap->flags & ATA_FLAG_AN) && | |
374 | (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY)) | |
375 | dev->flags |= ATA_DFLAG_AN; | |
376 | ||
377 | /* monitor SERR_PHYRDY_CHG on fan-out ports */ | |
b06ce3e5 TH |
378 | err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN, |
379 | SERR_PHYRDY_CHG); | |
380 | if (err_mask) { | |
381 | rc = -EIO; | |
3af9a77a TH |
382 | reason = "failed to write GSCR_ERROR_EN"; |
383 | goto fail; | |
384 | } | |
385 | ||
386 | /* turn off notification till fan-out ports are reset and configured */ | |
387 | if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) { | |
388 | gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY; | |
389 | ||
b06ce3e5 TH |
390 | err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_FEAT_EN, |
391 | gscr[SATA_PMP_GSCR_FEAT_EN]); | |
392 | if (err_mask) { | |
393 | rc = -EIO; | |
3af9a77a TH |
394 | reason = "failed to write GSCR_FEAT_EN"; |
395 | goto fail; | |
396 | } | |
397 | } | |
398 | ||
399 | if (print_info) { | |
400 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier %s, " | |
401 | "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n", | |
402 | sata_pmp_spec_rev_str(gscr), | |
403 | sata_pmp_gscr_vendor(gscr), | |
404 | sata_pmp_gscr_devid(gscr), | |
405 | sata_pmp_gscr_rev(gscr), | |
406 | nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN], | |
407 | gscr[SATA_PMP_GSCR_FEAT]); | |
408 | ||
409 | if (!(dev->flags & ATA_DFLAG_AN)) | |
410 | ata_dev_printk(dev, KERN_INFO, | |
411 | "Asynchronous notification not supported, " | |
412 | "hotplug won't\n work on fan-out " | |
413 | "ports. Use warm-plug instead.\n"); | |
414 | } | |
415 | ||
416 | return 0; | |
417 | ||
418 | fail: | |
419 | ata_dev_printk(dev, KERN_ERR, | |
b06ce3e5 TH |
420 | "failed to configure Port Multiplier (%s, Emask=0x%x)\n", |
421 | reason, err_mask); | |
3af9a77a TH |
422 | return rc; |
423 | } | |
424 | ||
425 | static int sata_pmp_init_links(struct ata_port *ap, int nr_ports) | |
426 | { | |
427 | struct ata_link *pmp_link = ap->pmp_link; | |
428 | int i; | |
429 | ||
430 | if (!pmp_link) { | |
431 | pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS, | |
432 | GFP_NOIO); | |
433 | if (!pmp_link) | |
434 | return -ENOMEM; | |
435 | ||
436 | for (i = 0; i < SATA_PMP_MAX_PORTS; i++) | |
437 | ata_link_init(ap, &pmp_link[i], i); | |
438 | ||
439 | ap->pmp_link = pmp_link; | |
440 | } | |
441 | ||
442 | for (i = 0; i < nr_ports; i++) { | |
443 | struct ata_link *link = &pmp_link[i]; | |
444 | struct ata_eh_context *ehc = &link->eh_context; | |
445 | ||
446 | link->flags = 0; | |
447 | ehc->i.probe_mask |= 1; | |
448 | ehc->i.action |= ATA_EH_SOFTRESET; | |
449 | ehc->i.flags |= ATA_EHI_RESUME_LINK; | |
450 | } | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
455 | static void sata_pmp_quirks(struct ata_port *ap) | |
456 | { | |
457 | u32 *gscr = ap->link.device->gscr; | |
458 | u16 vendor = sata_pmp_gscr_vendor(gscr); | |
459 | u16 devid = sata_pmp_gscr_devid(gscr); | |
460 | struct ata_link *link; | |
461 | ||
462 | if (vendor == 0x1095 && devid == 0x3726) { | |
463 | /* sil3726 quirks */ | |
464 | ata_port_for_each_link(link, ap) { | |
465 | /* SError.N need a kick in the ass to get working */ | |
466 | link->flags |= ATA_LFLAG_HRST_TO_RESUME; | |
467 | ||
468 | /* class code report is unreliable */ | |
469 | if (link->pmp < 5) | |
470 | link->flags |= ATA_LFLAG_ASSUME_ATA; | |
471 | ||
472 | /* port 5 is for SEMB device and it doesn't like SRST */ | |
473 | if (link->pmp == 5) | |
474 | link->flags |= ATA_LFLAG_NO_SRST | | |
475 | ATA_LFLAG_ASSUME_SEMB; | |
476 | } | |
477 | } else if (vendor == 0x1095 && devid == 0x4723) { | |
478 | /* sil4723 quirks */ | |
479 | ata_port_for_each_link(link, ap) { | |
480 | /* SError.N need a kick in the ass to get working */ | |
481 | link->flags |= ATA_LFLAG_HRST_TO_RESUME; | |
482 | ||
483 | /* class code report is unreliable */ | |
484 | if (link->pmp < 2) | |
485 | link->flags |= ATA_LFLAG_ASSUME_ATA; | |
486 | ||
487 | /* the config device at port 2 locks up on SRST */ | |
488 | if (link->pmp == 2) | |
489 | link->flags |= ATA_LFLAG_NO_SRST | | |
490 | ATA_LFLAG_ASSUME_ATA; | |
491 | } | |
492 | } else if (vendor == 0x1095 && devid == 0x4726) { | |
493 | /* sil4726 quirks */ | |
494 | ata_port_for_each_link(link, ap) { | |
495 | /* SError.N need a kick in the ass to get working */ | |
496 | link->flags |= ATA_LFLAG_HRST_TO_RESUME; | |
497 | ||
8048307d TH |
498 | /* Class code report is unreliable and SRST |
499 | * times out under certain configurations. | |
500 | * Config device can be at port 0 or 5 and | |
501 | * locks up on SRST. | |
3af9a77a | 502 | */ |
8048307d | 503 | if (link->pmp <= 5) |
3af9a77a TH |
504 | link->flags |= ATA_LFLAG_NO_SRST | |
505 | ATA_LFLAG_ASSUME_ATA; | |
506 | ||
507 | /* Port 6 is for SEMB device which doesn't | |
508 | * like SRST either. | |
509 | */ | |
510 | if (link->pmp == 6) | |
511 | link->flags |= ATA_LFLAG_NO_SRST | | |
512 | ATA_LFLAG_ASSUME_SEMB; | |
513 | } | |
514 | } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 || | |
515 | devid == 0x5734 || devid == 0x5744)) { | |
516 | /* sil5723/5744 quirks */ | |
517 | ||
518 | /* sil5723/5744 has either two or three downstream | |
519 | * ports depending on operation mode. The last port | |
520 | * is empty if any actual IO device is available or | |
521 | * occupied by a pseudo configuration device | |
522 | * otherwise. Don't try hard to recover it. | |
523 | */ | |
524 | ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY; | |
525 | } else if (vendor == 0x11ab && devid == 0x4140) { | |
526 | /* Marvell 88SM4140 quirks. Fan-out ports require PHY | |
527 | * reset to work; other than that, it behaves very | |
528 | * nicely. | |
529 | */ | |
530 | ata_port_for_each_link(link, ap) | |
531 | link->flags |= ATA_LFLAG_HRST_TO_RESUME; | |
532 | } | |
533 | } | |
534 | ||
535 | /** | |
536 | * sata_pmp_attach - attach a SATA PMP device | |
537 | * @dev: SATA PMP device to attach | |
538 | * | |
539 | * Configure and attach SATA PMP device @dev. This function is | |
540 | * also responsible for allocating and initializing PMP links. | |
541 | * | |
542 | * LOCKING: | |
543 | * Kernel thread context (may sleep). | |
544 | * | |
545 | * RETURNS: | |
546 | * 0 on success, -errno on failure. | |
547 | */ | |
548 | int sata_pmp_attach(struct ata_device *dev) | |
549 | { | |
550 | struct ata_link *link = dev->link; | |
551 | struct ata_port *ap = link->ap; | |
552 | unsigned long flags; | |
553 | struct ata_link *tlink; | |
554 | int rc; | |
555 | ||
556 | /* is it hanging off the right place? */ | |
557 | if (!(ap->flags & ATA_FLAG_PMP)) { | |
558 | ata_dev_printk(dev, KERN_ERR, | |
559 | "host does not support Port Multiplier\n"); | |
560 | return -EINVAL; | |
561 | } | |
562 | ||
563 | if (!ata_is_host_link(link)) { | |
564 | ata_dev_printk(dev, KERN_ERR, | |
565 | "Port Multipliers cannot be nested\n"); | |
566 | return -EINVAL; | |
567 | } | |
568 | ||
569 | if (dev->devno) { | |
570 | ata_dev_printk(dev, KERN_ERR, | |
571 | "Port Multiplier must be the first device\n"); | |
572 | return -EINVAL; | |
573 | } | |
574 | ||
575 | WARN_ON(link->pmp != 0); | |
576 | link->pmp = SATA_PMP_CTRL_PORT; | |
577 | ||
578 | /* read GSCR block */ | |
579 | rc = sata_pmp_read_gscr(dev, dev->gscr); | |
580 | if (rc) | |
581 | goto fail; | |
582 | ||
583 | /* config PMP */ | |
584 | rc = sata_pmp_configure(dev, 1); | |
585 | if (rc) | |
586 | goto fail; | |
587 | ||
588 | rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr)); | |
589 | if (rc) { | |
590 | ata_dev_printk(dev, KERN_INFO, | |
591 | "failed to initialize PMP links\n"); | |
592 | goto fail; | |
593 | } | |
594 | ||
595 | /* attach it */ | |
596 | spin_lock_irqsave(ap->lock, flags); | |
597 | WARN_ON(ap->nr_pmp_links); | |
598 | ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr); | |
599 | spin_unlock_irqrestore(ap->lock, flags); | |
600 | ||
601 | sata_pmp_quirks(ap); | |
602 | ||
603 | if (ap->ops->pmp_attach) | |
604 | ap->ops->pmp_attach(ap); | |
605 | ||
606 | ata_port_for_each_link(tlink, ap) | |
607 | sata_link_init_spd(tlink); | |
608 | ||
d0df8b5d TH |
609 | ata_acpi_associate_sata_port(ap); |
610 | ||
3af9a77a TH |
611 | return 0; |
612 | ||
613 | fail: | |
614 | link->pmp = 0; | |
615 | return rc; | |
616 | } | |
617 | ||
618 | /** | |
619 | * sata_pmp_detach - detach a SATA PMP device | |
620 | * @dev: SATA PMP device to detach | |
621 | * | |
622 | * Detach SATA PMP device @dev. This function is also | |
623 | * responsible for deconfiguring PMP links. | |
624 | * | |
625 | * LOCKING: | |
626 | * Kernel thread context (may sleep). | |
627 | */ | |
628 | static void sata_pmp_detach(struct ata_device *dev) | |
629 | { | |
630 | struct ata_link *link = dev->link; | |
631 | struct ata_port *ap = link->ap; | |
632 | struct ata_link *tlink; | |
633 | unsigned long flags; | |
634 | ||
635 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier detaching\n"); | |
636 | ||
637 | WARN_ON(!ata_is_host_link(link) || dev->devno || | |
638 | link->pmp != SATA_PMP_CTRL_PORT); | |
639 | ||
640 | if (ap->ops->pmp_detach) | |
641 | ap->ops->pmp_detach(ap); | |
642 | ||
643 | ata_port_for_each_link(tlink, ap) | |
644 | ata_eh_detach_dev(tlink->device); | |
645 | ||
646 | spin_lock_irqsave(ap->lock, flags); | |
647 | ap->nr_pmp_links = 0; | |
648 | link->pmp = 0; | |
649 | spin_unlock_irqrestore(ap->lock, flags); | |
d0df8b5d TH |
650 | |
651 | ata_acpi_associate_sata_port(ap); | |
3af9a77a TH |
652 | } |
653 | ||
654 | /** | |
655 | * sata_pmp_same_pmp - does new GSCR matches the configured PMP? | |
656 | * @dev: PMP device to compare against | |
657 | * @new_gscr: GSCR block of the new device | |
658 | * | |
659 | * Compare @new_gscr against @dev and determine whether @dev is | |
660 | * the PMP described by @new_gscr. | |
661 | * | |
662 | * LOCKING: | |
663 | * None. | |
664 | * | |
665 | * RETURNS: | |
666 | * 1 if @dev matches @new_gscr, 0 otherwise. | |
667 | */ | |
668 | static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr) | |
669 | { | |
670 | const u32 *old_gscr = dev->gscr; | |
671 | u16 old_vendor, new_vendor, old_devid, new_devid; | |
672 | int old_nr_ports, new_nr_ports; | |
673 | ||
674 | old_vendor = sata_pmp_gscr_vendor(old_gscr); | |
675 | new_vendor = sata_pmp_gscr_vendor(new_gscr); | |
676 | old_devid = sata_pmp_gscr_devid(old_gscr); | |
677 | new_devid = sata_pmp_gscr_devid(new_gscr); | |
678 | old_nr_ports = sata_pmp_gscr_ports(old_gscr); | |
679 | new_nr_ports = sata_pmp_gscr_ports(new_gscr); | |
680 | ||
681 | if (old_vendor != new_vendor) { | |
682 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier " | |
683 | "vendor mismatch '0x%x' != '0x%x'\n", | |
684 | old_vendor, new_vendor); | |
685 | return 0; | |
686 | } | |
687 | ||
688 | if (old_devid != new_devid) { | |
689 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier " | |
690 | "device ID mismatch '0x%x' != '0x%x'\n", | |
691 | old_devid, new_devid); | |
692 | return 0; | |
693 | } | |
694 | ||
695 | if (old_nr_ports != new_nr_ports) { | |
696 | ata_dev_printk(dev, KERN_INFO, "Port Multiplier " | |
697 | "nr_ports mismatch '0x%x' != '0x%x'\n", | |
698 | old_nr_ports, new_nr_ports); | |
699 | return 0; | |
700 | } | |
701 | ||
702 | return 1; | |
703 | } | |
704 | ||
705 | /** | |
706 | * sata_pmp_revalidate - revalidate SATA PMP | |
707 | * @dev: PMP device to revalidate | |
708 | * @new_class: new class code | |
709 | * | |
710 | * Re-read GSCR block and make sure @dev is still attached to the | |
711 | * port and properly configured. | |
712 | * | |
713 | * LOCKING: | |
714 | * Kernel thread context (may sleep). | |
715 | * | |
716 | * RETURNS: | |
717 | * 0 on success, -errno otherwise. | |
718 | */ | |
719 | static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class) | |
720 | { | |
721 | struct ata_link *link = dev->link; | |
722 | struct ata_port *ap = link->ap; | |
723 | u32 *gscr = (void *)ap->sector_buf; | |
724 | int rc; | |
725 | ||
726 | DPRINTK("ENTER\n"); | |
727 | ||
728 | ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE); | |
729 | ||
730 | if (!ata_dev_enabled(dev)) { | |
731 | rc = -ENODEV; | |
732 | goto fail; | |
733 | } | |
734 | ||
735 | /* wrong class? */ | |
736 | if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) { | |
737 | rc = -ENODEV; | |
738 | goto fail; | |
739 | } | |
740 | ||
741 | /* read GSCR */ | |
742 | rc = sata_pmp_read_gscr(dev, gscr); | |
743 | if (rc) | |
744 | goto fail; | |
745 | ||
746 | /* is the pmp still there? */ | |
747 | if (!sata_pmp_same_pmp(dev, gscr)) { | |
748 | rc = -ENODEV; | |
749 | goto fail; | |
750 | } | |
751 | ||
752 | memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS); | |
753 | ||
754 | rc = sata_pmp_configure(dev, 0); | |
755 | if (rc) | |
756 | goto fail; | |
757 | ||
758 | ata_eh_done(link, NULL, ATA_EH_REVALIDATE); | |
759 | ||
760 | DPRINTK("EXIT, rc=0\n"); | |
761 | return 0; | |
762 | ||
763 | fail: | |
764 | ata_dev_printk(dev, KERN_ERR, | |
765 | "PMP revalidation failed (errno=%d)\n", rc); | |
766 | DPRINTK("EXIT, rc=%d\n", rc); | |
767 | return rc; | |
768 | } | |
769 | ||
770 | /** | |
771 | * sata_pmp_revalidate_quick - revalidate SATA PMP quickly | |
772 | * @dev: PMP device to revalidate | |
773 | * | |
774 | * Make sure the attached PMP is accessible. | |
775 | * | |
776 | * LOCKING: | |
777 | * Kernel thread context (may sleep). | |
778 | * | |
779 | * RETURNS: | |
780 | * 0 on success, -errno otherwise. | |
781 | */ | |
782 | static int sata_pmp_revalidate_quick(struct ata_device *dev) | |
783 | { | |
b06ce3e5 | 784 | unsigned int err_mask; |
3af9a77a | 785 | u32 prod_id; |
3af9a77a | 786 | |
b06ce3e5 TH |
787 | err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id); |
788 | if (err_mask) { | |
789 | ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID " | |
790 | "(Emask=0x%x)\n", err_mask); | |
791 | return -EIO; | |
3af9a77a TH |
792 | } |
793 | ||
794 | if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) { | |
795 | ata_dev_printk(dev, KERN_ERR, "PMP product ID mismatch\n"); | |
796 | /* something weird is going on, request full PMP recovery */ | |
797 | return -EIO; | |
798 | } | |
799 | ||
800 | return 0; | |
801 | } | |
802 | ||
803 | /** | |
804 | * sata_pmp_eh_recover_pmp - recover PMP | |
805 | * @ap: ATA port PMP is attached to | |
806 | * @prereset: prereset method (can be NULL) | |
807 | * @softreset: softreset method | |
808 | * @hardreset: hardreset method | |
809 | * @postreset: postreset method (can be NULL) | |
810 | * | |
811 | * Recover PMP attached to @ap. Recovery procedure is somewhat | |
812 | * similar to that of ata_eh_recover() except that reset should | |
813 | * always be performed in hard->soft sequence and recovery | |
814 | * failure results in PMP detachment. | |
815 | * | |
816 | * LOCKING: | |
817 | * Kernel thread context (may sleep). | |
818 | * | |
819 | * RETURNS: | |
820 | * 0 on success, -errno on failure. | |
821 | */ | |
822 | static int sata_pmp_eh_recover_pmp(struct ata_port *ap, | |
823 | ata_prereset_fn_t prereset, ata_reset_fn_t softreset, | |
824 | ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) | |
825 | { | |
826 | struct ata_link *link = &ap->link; | |
827 | struct ata_eh_context *ehc = &link->eh_context; | |
828 | struct ata_device *dev = link->device; | |
829 | int tries = ATA_EH_PMP_TRIES; | |
830 | int detach = 0, rc = 0; | |
831 | int reval_failed = 0; | |
832 | ||
833 | DPRINTK("ENTER\n"); | |
834 | ||
835 | if (dev->flags & ATA_DFLAG_DETACH) { | |
836 | detach = 1; | |
837 | goto fail; | |
838 | } | |
839 | ||
840 | retry: | |
841 | ehc->classes[0] = ATA_DEV_UNKNOWN; | |
842 | ||
843 | if (ehc->i.action & ATA_EH_RESET_MASK) { | |
844 | struct ata_link *tlink; | |
845 | ||
846 | ata_eh_freeze_port(ap); | |
847 | ||
848 | /* reset */ | |
849 | ehc->i.action = ATA_EH_HARDRESET; | |
850 | rc = ata_eh_reset(link, 0, prereset, softreset, hardreset, | |
851 | postreset); | |
852 | if (rc) { | |
853 | ata_link_printk(link, KERN_ERR, | |
854 | "failed to reset PMP, giving up\n"); | |
855 | goto fail; | |
856 | } | |
857 | ||
858 | ata_eh_thaw_port(ap); | |
859 | ||
860 | /* PMP is reset, SErrors cannot be trusted, scan all */ | |
861 | ata_port_for_each_link(tlink, ap) | |
862 | ata_ehi_schedule_probe(&tlink->eh_context.i); | |
863 | } | |
864 | ||
865 | /* If revalidation is requested, revalidate and reconfigure; | |
866 | * otherwise, do quick revalidation. | |
867 | */ | |
868 | if (ehc->i.action & ATA_EH_REVALIDATE) | |
869 | rc = sata_pmp_revalidate(dev, ehc->classes[0]); | |
870 | else | |
871 | rc = sata_pmp_revalidate_quick(dev); | |
872 | ||
873 | if (rc) { | |
874 | tries--; | |
875 | ||
876 | if (rc == -ENODEV) { | |
877 | ehc->i.probe_mask |= 1; | |
878 | detach = 1; | |
879 | /* give it just two more chances */ | |
880 | tries = min(tries, 2); | |
881 | } | |
882 | ||
883 | if (tries) { | |
884 | int sleep = ehc->i.flags & ATA_EHI_DID_RESET; | |
885 | ||
886 | /* consecutive revalidation failures? speed down */ | |
887 | if (reval_failed) | |
888 | sata_down_spd_limit(link); | |
889 | else | |
890 | reval_failed = 1; | |
891 | ||
892 | ata_dev_printk(dev, KERN_WARNING, | |
893 | "retrying hardreset%s\n", | |
894 | sleep ? " in 5 secs" : ""); | |
895 | if (sleep) | |
896 | ssleep(5); | |
897 | ehc->i.action |= ATA_EH_HARDRESET; | |
898 | goto retry; | |
899 | } else { | |
900 | ata_dev_printk(dev, KERN_ERR, "failed to recover PMP " | |
901 | "after %d tries, giving up\n", | |
902 | ATA_EH_PMP_TRIES); | |
903 | goto fail; | |
904 | } | |
905 | } | |
906 | ||
907 | /* okay, PMP resurrected */ | |
908 | ehc->i.flags = 0; | |
909 | ||
910 | DPRINTK("EXIT, rc=0\n"); | |
911 | return 0; | |
912 | ||
913 | fail: | |
914 | sata_pmp_detach(dev); | |
915 | if (detach) | |
916 | ata_eh_detach_dev(dev); | |
917 | else | |
918 | ata_dev_disable(dev); | |
919 | ||
920 | DPRINTK("EXIT, rc=%d\n", rc); | |
921 | return rc; | |
922 | } | |
923 | ||
924 | static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap) | |
925 | { | |
926 | struct ata_link *link; | |
927 | unsigned long flags; | |
928 | int rc; | |
929 | ||
930 | spin_lock_irqsave(ap->lock, flags); | |
931 | ||
932 | ata_port_for_each_link(link, ap) { | |
933 | if (!(link->flags & ATA_LFLAG_DISABLED)) | |
934 | continue; | |
935 | ||
936 | spin_unlock_irqrestore(ap->lock, flags); | |
937 | ||
938 | /* Some PMPs require hardreset sequence to get | |
939 | * SError.N working. | |
940 | */ | |
941 | if ((link->flags & ATA_LFLAG_HRST_TO_RESUME) && | |
942 | (link->eh_context.i.flags & ATA_EHI_RESUME_LINK)) | |
943 | sata_link_hardreset(link, sata_deb_timing_normal, | |
944 | jiffies + ATA_TMOUT_INTERNAL_QUICK); | |
945 | ||
946 | /* unconditionally clear SError.N */ | |
947 | rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG); | |
948 | if (rc) { | |
949 | ata_link_printk(link, KERN_ERR, "failed to clear " | |
950 | "SError.N (errno=%d)\n", rc); | |
951 | return rc; | |
952 | } | |
953 | ||
954 | spin_lock_irqsave(ap->lock, flags); | |
955 | } | |
956 | ||
957 | spin_unlock_irqrestore(ap->lock, flags); | |
958 | ||
959 | return 0; | |
960 | } | |
961 | ||
962 | static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries) | |
963 | { | |
964 | struct ata_port *ap = link->ap; | |
965 | unsigned long flags; | |
966 | ||
967 | if (link_tries[link->pmp] && --link_tries[link->pmp]) | |
968 | return 1; | |
969 | ||
970 | /* disable this link */ | |
971 | if (!(link->flags & ATA_LFLAG_DISABLED)) { | |
972 | ata_link_printk(link, KERN_WARNING, | |
973 | "failed to recover link after %d tries, disabling\n", | |
974 | ATA_EH_PMP_LINK_TRIES); | |
975 | ||
976 | spin_lock_irqsave(ap->lock, flags); | |
977 | link->flags |= ATA_LFLAG_DISABLED; | |
978 | spin_unlock_irqrestore(ap->lock, flags); | |
979 | } | |
980 | ||
981 | ata_dev_disable(link->device); | |
982 | link->eh_context.i.action = 0; | |
983 | ||
984 | return 0; | |
985 | } | |
986 | ||
987 | /** | |
988 | * sata_pmp_eh_recover - recover PMP-enabled port | |
989 | * @ap: ATA port to recover | |
990 | * @prereset: prereset method (can be NULL) | |
991 | * @softreset: softreset method | |
992 | * @hardreset: hardreset method | |
993 | * @postreset: postreset method (can be NULL) | |
994 | * @pmp_prereset: PMP prereset method (can be NULL) | |
995 | * @pmp_softreset: PMP softreset method (can be NULL) | |
996 | * @pmp_hardreset: PMP hardreset method (can be NULL) | |
997 | * @pmp_postreset: PMP postreset method (can be NULL) | |
998 | * | |
999 | * Drive EH recovery operation for PMP enabled port @ap. This | |
1000 | * function recovers host and PMP ports with proper retrials and | |
1001 | * fallbacks. Actual recovery operations are performed using | |
1002 | * ata_eh_recover() and sata_pmp_eh_recover_pmp(). | |
1003 | * | |
1004 | * LOCKING: | |
1005 | * Kernel thread context (may sleep). | |
1006 | * | |
1007 | * RETURNS: | |
1008 | * 0 on success, -errno on failure. | |
1009 | */ | |
1010 | static int sata_pmp_eh_recover(struct ata_port *ap, | |
1011 | ata_prereset_fn_t prereset, ata_reset_fn_t softreset, | |
1012 | ata_reset_fn_t hardreset, ata_postreset_fn_t postreset, | |
1013 | ata_prereset_fn_t pmp_prereset, ata_reset_fn_t pmp_softreset, | |
1014 | ata_reset_fn_t pmp_hardreset, ata_postreset_fn_t pmp_postreset) | |
1015 | { | |
1016 | int pmp_tries, link_tries[SATA_PMP_MAX_PORTS]; | |
1017 | struct ata_link *pmp_link = &ap->link; | |
1018 | struct ata_device *pmp_dev = pmp_link->device; | |
1019 | struct ata_eh_context *pmp_ehc = &pmp_link->eh_context; | |
1020 | struct ata_link *link; | |
1021 | struct ata_device *dev; | |
b06ce3e5 | 1022 | unsigned int err_mask; |
3af9a77a TH |
1023 | u32 gscr_error, sntf; |
1024 | int cnt, rc; | |
1025 | ||
1026 | pmp_tries = ATA_EH_PMP_TRIES; | |
1027 | ata_port_for_each_link(link, ap) | |
1028 | link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; | |
1029 | ||
1030 | retry: | |
1031 | /* PMP attached? */ | |
1032 | if (!ap->nr_pmp_links) { | |
1033 | rc = ata_eh_recover(ap, prereset, softreset, hardreset, | |
1034 | postreset, NULL); | |
1035 | if (rc) { | |
1036 | ata_link_for_each_dev(dev, &ap->link) | |
1037 | ata_dev_disable(dev); | |
1038 | return rc; | |
1039 | } | |
1040 | ||
1041 | if (pmp_dev->class != ATA_DEV_PMP) | |
1042 | return 0; | |
1043 | ||
1044 | /* new PMP online */ | |
1045 | ata_port_for_each_link(link, ap) | |
1046 | link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; | |
1047 | ||
1048 | /* fall through */ | |
1049 | } | |
1050 | ||
1051 | /* recover pmp */ | |
1052 | rc = sata_pmp_eh_recover_pmp(ap, prereset, softreset, hardreset, | |
1053 | postreset); | |
1054 | if (rc) | |
1055 | goto pmp_fail; | |
1056 | ||
1057 | /* handle disabled links */ | |
1058 | rc = sata_pmp_eh_handle_disabled_links(ap); | |
1059 | if (rc) | |
1060 | goto pmp_fail; | |
1061 | ||
1062 | /* recover links */ | |
1063 | rc = ata_eh_recover(ap, pmp_prereset, pmp_softreset, pmp_hardreset, | |
1064 | pmp_postreset, &link); | |
1065 | if (rc) | |
1066 | goto link_fail; | |
1067 | ||
1068 | /* Connection status might have changed while resetting other | |
1069 | * links, check SATA_PMP_GSCR_ERROR before returning. | |
1070 | */ | |
1071 | ||
1072 | /* clear SNotification */ | |
1073 | rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf); | |
1074 | if (rc == 0) | |
1075 | sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf); | |
1076 | ||
1077 | /* enable notification */ | |
1078 | if (pmp_dev->flags & ATA_DFLAG_AN) { | |
1079 | pmp_dev->gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY; | |
1080 | ||
b06ce3e5 TH |
1081 | err_mask = sata_pmp_write(pmp_dev->link, SATA_PMP_GSCR_FEAT_EN, |
1082 | pmp_dev->gscr[SATA_PMP_GSCR_FEAT_EN]); | |
1083 | if (err_mask) { | |
1084 | ata_dev_printk(pmp_dev, KERN_ERR, "failed to write " | |
1085 | "PMP_FEAT_EN (Emask=0x%x)\n", err_mask); | |
1086 | rc = -EIO; | |
3af9a77a TH |
1087 | goto pmp_fail; |
1088 | } | |
1089 | } | |
1090 | ||
1091 | /* check GSCR_ERROR */ | |
b06ce3e5 TH |
1092 | err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error); |
1093 | if (err_mask) { | |
1094 | ata_dev_printk(pmp_dev, KERN_ERR, "failed to read " | |
1095 | "PMP_GSCR_ERROR (Emask=0x%x)\n", err_mask); | |
1096 | rc = -EIO; | |
3af9a77a TH |
1097 | goto pmp_fail; |
1098 | } | |
1099 | ||
1100 | cnt = 0; | |
1101 | ata_port_for_each_link(link, ap) { | |
1102 | if (!(gscr_error & (1 << link->pmp))) | |
1103 | continue; | |
1104 | ||
1105 | if (sata_pmp_handle_link_fail(link, link_tries)) { | |
1106 | ata_ehi_hotplugged(&link->eh_context.i); | |
1107 | cnt++; | |
1108 | } else { | |
1109 | ata_link_printk(link, KERN_WARNING, | |
1110 | "PHY status changed but maxed out on retries, " | |
1111 | "giving up\n"); | |
1112 | ata_link_printk(link, KERN_WARNING, | |
1113 | "Manully issue scan to resume this link\n"); | |
1114 | } | |
1115 | } | |
1116 | ||
1117 | if (cnt) { | |
1118 | ata_port_printk(ap, KERN_INFO, "PMP SError.N set for some " | |
1119 | "ports, repeating recovery\n"); | |
1120 | goto retry; | |
1121 | } | |
1122 | ||
1123 | return 0; | |
1124 | ||
1125 | link_fail: | |
1126 | if (sata_pmp_handle_link_fail(link, link_tries)) { | |
1127 | pmp_ehc->i.action |= ATA_EH_HARDRESET; | |
1128 | goto retry; | |
1129 | } | |
1130 | ||
1131 | /* fall through */ | |
1132 | pmp_fail: | |
1133 | /* Control always ends up here after detaching PMP. Shut up | |
1134 | * and return if we're unloading. | |
1135 | */ | |
1136 | if (ap->pflags & ATA_PFLAG_UNLOADING) | |
1137 | return rc; | |
1138 | ||
1139 | if (!ap->nr_pmp_links) | |
1140 | goto retry; | |
1141 | ||
1142 | if (--pmp_tries) { | |
1143 | ata_port_printk(ap, KERN_WARNING, | |
1144 | "failed to recover PMP, retrying in 5 secs\n"); | |
1145 | pmp_ehc->i.action |= ATA_EH_HARDRESET; | |
1146 | ssleep(5); | |
1147 | goto retry; | |
1148 | } | |
1149 | ||
1150 | ata_port_printk(ap, KERN_ERR, | |
1151 | "failed to recover PMP after %d tries, giving up\n", | |
1152 | ATA_EH_PMP_TRIES); | |
1153 | sata_pmp_detach(pmp_dev); | |
1154 | ata_dev_disable(pmp_dev); | |
1155 | ||
1156 | return rc; | |
1157 | } | |
1158 | ||
1159 | /** | |
1160 | * sata_pmp_do_eh - do standard error handling for PMP-enabled host | |
1161 | * @ap: host port to handle error for | |
1162 | * @prereset: prereset method (can be NULL) | |
1163 | * @softreset: softreset method | |
1164 | * @hardreset: hardreset method | |
1165 | * @postreset: postreset method (can be NULL) | |
1166 | * @pmp_prereset: PMP prereset method (can be NULL) | |
1167 | * @pmp_softreset: PMP softreset method (can be NULL) | |
1168 | * @pmp_hardreset: PMP hardreset method (can be NULL) | |
1169 | * @pmp_postreset: PMP postreset method (can be NULL) | |
1170 | * | |
1171 | * Perform standard error handling sequence for PMP-enabled host | |
1172 | * @ap. | |
1173 | * | |
1174 | * LOCKING: | |
1175 | * Kernel thread context (may sleep). | |
1176 | */ | |
1177 | void sata_pmp_do_eh(struct ata_port *ap, | |
1178 | ata_prereset_fn_t prereset, ata_reset_fn_t softreset, | |
1179 | ata_reset_fn_t hardreset, ata_postreset_fn_t postreset, | |
1180 | ata_prereset_fn_t pmp_prereset, ata_reset_fn_t pmp_softreset, | |
1181 | ata_reset_fn_t pmp_hardreset, ata_postreset_fn_t pmp_postreset) | |
1182 | { | |
1183 | ata_eh_autopsy(ap); | |
1184 | ata_eh_report(ap); | |
1185 | sata_pmp_eh_recover(ap, prereset, softreset, hardreset, postreset, | |
1186 | pmp_prereset, pmp_softreset, pmp_hardreset, | |
1187 | pmp_postreset); | |
1188 | ata_eh_finish(ap); | |
1189 | } |