blob: 21b80c555c607768912953c1f355bf25615c8a22 [file] [log] [blame]
Tejun Heo3af9a772007-09-23 13:19:54 +09001/*
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>
Paul Gortmaker38789fd2011-07-17 15:33:58 -040011#include <linux/export.h>
Tejun Heo3af9a772007-09-23 13:19:54 +090012#include <linux/libata.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090013#include <linux/slab.h>
Tejun Heo3af9a772007-09-23 13:19:54 +090014#include "libata.h"
Gwendal Grignoud9027472010-05-25 12:31:38 -070015#include "libata-transport.h"
Tejun Heo3af9a772007-09-23 13:19:54 +090016
Tejun Heo48515f62008-04-07 22:47:21 +090017const struct ata_port_operations sata_pmp_port_ops = {
18 .inherits = &sata_port_ops,
19 .pmp_prereset = ata_std_prereset,
20 .pmp_hardreset = sata_std_hardreset,
21 .pmp_postreset = ata_std_postreset,
22 .error_handler = sata_pmp_error_handler,
23};
24
Tejun Heo3af9a772007-09-23 13:19:54 +090025/**
26 * sata_pmp_read - read PMP register
27 * @link: link to read PMP register for
28 * @reg: register to read
29 * @r_val: resulting value
30 *
Tejun Heob06ce3e2007-10-09 15:06:48 +090031 * Read PMP register.
Tejun Heo3af9a772007-09-23 13:19:54 +090032 *
33 * LOCKING:
34 * Kernel thread context (may sleep).
35 *
36 * RETURNS:
Tejun Heob06ce3e2007-10-09 15:06:48 +090037 * 0 on success, AC_ERR_* mask on failure.
Tejun Heo3af9a772007-09-23 13:19:54 +090038 */
Tejun Heob06ce3e2007-10-09 15:06:48 +090039static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val)
Tejun Heo3af9a772007-09-23 13:19:54 +090040{
41 struct ata_port *ap = link->ap;
42 struct ata_device *pmp_dev = ap->link.device;
Tejun Heob06ce3e2007-10-09 15:06:48 +090043 struct ata_taskfile tf;
44 unsigned int err_mask;
Tejun Heo3af9a772007-09-23 13:19:54 +090045
Tejun Heob06ce3e2007-10-09 15:06:48 +090046 ata_tf_init(pmp_dev, &tf);
47 tf.command = ATA_CMD_PMP_READ;
48 tf.protocol = ATA_PROT_NODATA;
Mark Lord39f25e72008-02-21 15:52:25 -050049 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
Tejun Heob06ce3e2007-10-09 15:06:48 +090050 tf.feature = reg;
51 tf.device = link->pmp;
Tejun Heo3af9a772007-09-23 13:19:54 +090052
Tejun Heob06ce3e2007-10-09 15:06:48 +090053 err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
Tejun Heobf1bff62008-05-19 01:15:10 +090054 SATA_PMP_RW_TIMEOUT);
Tejun Heob06ce3e2007-10-09 15:06:48 +090055 if (err_mask)
56 return err_mask;
57
58 *r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24;
59 return 0;
Tejun Heo3af9a772007-09-23 13:19:54 +090060}
61
62/**
63 * sata_pmp_write - write PMP register
64 * @link: link to write PMP register for
65 * @reg: register to write
66 * @r_val: value to write
67 *
Tejun Heob06ce3e2007-10-09 15:06:48 +090068 * Write PMP register.
Tejun Heo3af9a772007-09-23 13:19:54 +090069 *
70 * LOCKING:
71 * Kernel thread context (may sleep).
72 *
73 * RETURNS:
Tejun Heob06ce3e2007-10-09 15:06:48 +090074 * 0 on success, AC_ERR_* mask on failure.
Tejun Heo3af9a772007-09-23 13:19:54 +090075 */
Tejun Heob06ce3e2007-10-09 15:06:48 +090076static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val)
Tejun Heo3af9a772007-09-23 13:19:54 +090077{
78 struct ata_port *ap = link->ap;
79 struct ata_device *pmp_dev = ap->link.device;
Tejun Heob06ce3e2007-10-09 15:06:48 +090080 struct ata_taskfile tf;
Tejun Heo3af9a772007-09-23 13:19:54 +090081
Tejun Heob06ce3e2007-10-09 15:06:48 +090082 ata_tf_init(pmp_dev, &tf);
83 tf.command = ATA_CMD_PMP_WRITE;
84 tf.protocol = ATA_PROT_NODATA;
Mark Lord39f25e72008-02-21 15:52:25 -050085 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
Tejun Heob06ce3e2007-10-09 15:06:48 +090086 tf.feature = reg;
87 tf.device = link->pmp;
88 tf.nsect = val & 0xff;
89 tf.lbal = (val >> 8) & 0xff;
90 tf.lbam = (val >> 16) & 0xff;
91 tf.lbah = (val >> 24) & 0xff;
Tejun Heo3af9a772007-09-23 13:19:54 +090092
Tejun Heob06ce3e2007-10-09 15:06:48 +090093 return ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
Tejun Heobf1bff62008-05-19 01:15:10 +090094 SATA_PMP_RW_TIMEOUT);
Tejun Heo3af9a772007-09-23 13:19:54 +090095}
96
97/**
Tejun Heo31f88382007-09-23 13:19:54 +090098 * sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP
99 * @qc: ATA command in question
100 *
101 * A host which has command switching PMP support cannot issue
102 * commands to multiple links simultaneously.
103 *
104 * LOCKING:
105 * spin_lock_irqsave(host lock)
106 *
107 * RETURNS:
108 * ATA_DEFER_* if deferring is needed, 0 otherwise.
109 */
110int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc)
111{
112 struct ata_link *link = qc->dev->link;
113 struct ata_port *ap = link->ap;
114
115 if (ap->excl_link == NULL || ap->excl_link == link) {
116 if (ap->nr_active_links == 0 || ata_link_active(link)) {
117 qc->flags |= ATA_QCFLAG_CLEAR_EXCL;
118 return ata_std_qc_defer(qc);
119 }
120
121 ap->excl_link = link;
122 }
123
124 return ATA_DEFER_PORT;
125}
126
127/**
Tejun Heo3af9a772007-09-23 13:19:54 +0900128 * sata_pmp_scr_read - read PSCR
129 * @link: ATA link to read PSCR for
130 * @reg: PSCR to read
131 * @r_val: resulting value
132 *
133 * Read PSCR @reg into @r_val for @link, to be called from
134 * ata_scr_read().
135 *
136 * LOCKING:
137 * Kernel thread context (may sleep).
138 *
139 * RETURNS:
140 * 0 on success, -errno on failure.
141 */
142int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val)
143{
Tejun Heob06ce3e2007-10-09 15:06:48 +0900144 unsigned int err_mask;
145
Tejun Heo3af9a772007-09-23 13:19:54 +0900146 if (reg > SATA_PMP_PSCR_CONTROL)
147 return -EINVAL;
148
Tejun Heob06ce3e2007-10-09 15:06:48 +0900149 err_mask = sata_pmp_read(link, reg, r_val);
150 if (err_mask) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700151 ata_link_warn(link, "failed to read SCR %d (Emask=0x%x)\n",
152 reg, err_mask);
Tejun Heob06ce3e2007-10-09 15:06:48 +0900153 return -EIO;
154 }
155 return 0;
Tejun Heo3af9a772007-09-23 13:19:54 +0900156}
157
158/**
159 * sata_pmp_scr_write - write PSCR
160 * @link: ATA link to write PSCR for
161 * @reg: PSCR to write
162 * @val: value to be written
163 *
164 * Write @val to PSCR @reg for @link, to be called from
165 * ata_scr_write() and ata_scr_write_flush().
166 *
167 * LOCKING:
168 * Kernel thread context (may sleep).
169 *
170 * RETURNS:
171 * 0 on success, -errno on failure.
172 */
173int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val)
174{
Tejun Heob06ce3e2007-10-09 15:06:48 +0900175 unsigned int err_mask;
176
Tejun Heo3af9a772007-09-23 13:19:54 +0900177 if (reg > SATA_PMP_PSCR_CONTROL)
178 return -EINVAL;
179
Tejun Heob06ce3e2007-10-09 15:06:48 +0900180 err_mask = sata_pmp_write(link, reg, val);
181 if (err_mask) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700182 ata_link_warn(link, "failed to write SCR %d (Emask=0x%x)\n",
183 reg, err_mask);
Tejun Heob06ce3e2007-10-09 15:06:48 +0900184 return -EIO;
185 }
186 return 0;
Tejun Heo3af9a772007-09-23 13:19:54 +0900187}
188
189/**
Tejun Heo6c8ea892010-09-01 17:50:07 +0200190 * sata_pmp_set_lpm - configure LPM for a PMP link
191 * @link: PMP link to configure LPM for
192 * @policy: target LPM policy
193 * @hints: LPM hints
194 *
195 * Configure LPM for @link. This function will contain any PMP
196 * specific workarounds if necessary.
197 *
198 * LOCKING:
199 * EH context.
200 *
201 * RETURNS:
202 * 0 on success, -errno on failure.
203 */
204int sata_pmp_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
205 unsigned hints)
206{
207 return sata_link_scr_lpm(link, policy, true);
208}
209
210/**
Tejun Heo3af9a772007-09-23 13:19:54 +0900211 * sata_pmp_read_gscr - read GSCR block of SATA PMP
212 * @dev: PMP device
213 * @gscr: buffer to read GSCR block into
214 *
215 * Read selected PMP GSCRs from the PMP at @dev. This will serve
216 * as configuration and identification info for the PMP.
217 *
218 * LOCKING:
219 * Kernel thread context (may sleep).
220 *
221 * RETURNS:
222 * 0 on success, -errno on failure.
223 */
224static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr)
225{
226 static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 };
Tejun Heob06ce3e2007-10-09 15:06:48 +0900227 int i;
Tejun Heo3af9a772007-09-23 13:19:54 +0900228
229 for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) {
230 int reg = gscr_to_read[i];
Tejun Heob06ce3e2007-10-09 15:06:48 +0900231 unsigned int err_mask;
Tejun Heo3af9a772007-09-23 13:19:54 +0900232
Tejun Heob06ce3e2007-10-09 15:06:48 +0900233 err_mask = sata_pmp_read(dev->link, reg, &gscr[reg]);
234 if (err_mask) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700235 ata_dev_err(dev, "failed to read PMP GSCR[%d] (Emask=0x%x)\n",
236 reg, err_mask);
Tejun Heob06ce3e2007-10-09 15:06:48 +0900237 return -EIO;
Tejun Heo3af9a772007-09-23 13:19:54 +0900238 }
239 }
240
241 return 0;
242}
243
244static const char *sata_pmp_spec_rev_str(const u32 *gscr)
245{
246 u32 rev = gscr[SATA_PMP_GSCR_REV];
247
Shane Huangdeeb0032009-09-08 17:37:01 +0800248 if (rev & (1 << 3))
249 return "1.2";
Tejun Heo3af9a772007-09-23 13:19:54 +0900250 if (rev & (1 << 2))
251 return "1.1";
252 if (rev & (1 << 1))
253 return "1.0";
254 return "<unknown>";
255}
256
Grant Grundler4f2c7742010-04-14 18:43:32 -0700257#define PMP_GSCR_SII_POL 129
258
Tejun Heo3af9a772007-09-23 13:19:54 +0900259static int sata_pmp_configure(struct ata_device *dev, int print_info)
260{
261 struct ata_port *ap = dev->link->ap;
262 u32 *gscr = dev->gscr;
Grant Grundler4f2c7742010-04-14 18:43:32 -0700263 u16 vendor = sata_pmp_gscr_vendor(gscr);
264 u16 devid = sata_pmp_gscr_devid(gscr);
Tejun Heob06ce3e2007-10-09 15:06:48 +0900265 unsigned int err_mask = 0;
Tejun Heo3af9a772007-09-23 13:19:54 +0900266 const char *reason;
267 int nr_ports, rc;
268
269 nr_ports = sata_pmp_gscr_ports(gscr);
270
271 if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) {
272 rc = -EINVAL;
273 reason = "invalid nr_ports";
274 goto fail;
275 }
276
277 if ((ap->flags & ATA_FLAG_AN) &&
278 (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY))
279 dev->flags |= ATA_DFLAG_AN;
280
281 /* monitor SERR_PHYRDY_CHG on fan-out ports */
Tejun Heob06ce3e2007-10-09 15:06:48 +0900282 err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN,
283 SERR_PHYRDY_CHG);
284 if (err_mask) {
285 rc = -EIO;
Tejun Heo3af9a772007-09-23 13:19:54 +0900286 reason = "failed to write GSCR_ERROR_EN";
287 goto fail;
288 }
289
Grant Grundler4f2c7742010-04-14 18:43:32 -0700290 /* Disable sending Early R_OK.
291 * With "cached read" HDD testing and multiple ports busy on a SATA
292 * host controller, 3726 PMP will very rarely drop a deferred
293 * R_OK that was intended for the host. Symptom will be all
294 * 5 drives under test will timeout, get reset, and recover.
295 */
296 if (vendor == 0x1095 && devid == 0x3726) {
297 u32 reg;
298
299 err_mask = sata_pmp_read(&ap->link, PMP_GSCR_SII_POL, &reg);
300 if (err_mask) {
301 rc = -EIO;
302 reason = "failed to read Sil3726 Private Register";
303 goto fail;
304 }
305 reg &= ~0x1;
306 err_mask = sata_pmp_write(&ap->link, PMP_GSCR_SII_POL, reg);
307 if (err_mask) {
308 rc = -EIO;
309 reason = "failed to write Sil3726 Private Register";
310 goto fail;
311 }
312 }
313
Tejun Heo3af9a772007-09-23 13:19:54 +0900314 if (print_info) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700315 ata_dev_info(dev, "Port Multiplier %s, "
316 "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n",
317 sata_pmp_spec_rev_str(gscr), vendor, devid,
318 sata_pmp_gscr_rev(gscr),
319 nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN],
320 gscr[SATA_PMP_GSCR_FEAT]);
Tejun Heo3af9a772007-09-23 13:19:54 +0900321
322 if (!(dev->flags & ATA_DFLAG_AN))
Joe Perchesa9a79df2011-04-15 15:51:59 -0700323 ata_dev_info(dev,
Tejun Heo3af9a772007-09-23 13:19:54 +0900324 "Asynchronous notification not supported, "
Joe Perchesa9a79df2011-04-15 15:51:59 -0700325 "hotplug won't work on fan-out ports. Use warm-plug instead.\n");
Tejun Heo3af9a772007-09-23 13:19:54 +0900326 }
327
328 return 0;
329
330 fail:
Joe Perchesa9a79df2011-04-15 15:51:59 -0700331 ata_dev_err(dev,
332 "failed to configure Port Multiplier (%s, Emask=0x%x)\n",
333 reason, err_mask);
Tejun Heo3af9a772007-09-23 13:19:54 +0900334 return rc;
335}
336
Gwendal Grignoud9027472010-05-25 12:31:38 -0700337static int sata_pmp_init_links (struct ata_port *ap, int nr_ports)
Tejun Heo3af9a772007-09-23 13:19:54 +0900338{
339 struct ata_link *pmp_link = ap->pmp_link;
Gwendal Grignoud9027472010-05-25 12:31:38 -0700340 int i, err;
Tejun Heo3af9a772007-09-23 13:19:54 +0900341
342 if (!pmp_link) {
343 pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS,
344 GFP_NOIO);
345 if (!pmp_link)
346 return -ENOMEM;
347
348 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
349 ata_link_init(ap, &pmp_link[i], i);
350
351 ap->pmp_link = pmp_link;
Gwendal Grignoud9027472010-05-25 12:31:38 -0700352
353 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) {
354 err = ata_tlink_add(&pmp_link[i]);
355 if (err) {
356 goto err_tlink;
357 }
358 }
Tejun Heo3af9a772007-09-23 13:19:54 +0900359 }
360
361 for (i = 0; i < nr_ports; i++) {
362 struct ata_link *link = &pmp_link[i];
363 struct ata_eh_context *ehc = &link->eh_context;
364
365 link->flags = 0;
Tejun Heob558edd2008-01-24 00:05:14 +0900366 ehc->i.probe_mask |= ATA_ALL_DEVICES;
Tejun Heocf480622008-01-24 00:05:14 +0900367 ehc->i.action |= ATA_EH_RESET;
Tejun Heo3af9a772007-09-23 13:19:54 +0900368 }
369
370 return 0;
Gwendal Grignoud9027472010-05-25 12:31:38 -0700371 err_tlink:
372 while (--i >= 0)
373 ata_tlink_delete(&pmp_link[i]);
374 kfree(pmp_link);
375 ap->pmp_link = NULL;
376 return err;
Tejun Heo3af9a772007-09-23 13:19:54 +0900377}
378
379static void sata_pmp_quirks(struct ata_port *ap)
380{
381 u32 *gscr = ap->link.device->gscr;
382 u16 vendor = sata_pmp_gscr_vendor(gscr);
383 u16 devid = sata_pmp_gscr_devid(gscr);
384 struct ata_link *link;
385
386 if (vendor == 0x1095 && devid == 0x3726) {
387 /* sil3726 quirks */
Tejun Heo1eca4362008-11-03 20:03:17 +0900388 ata_for_each_link(link, ap, EDGE) {
Tejun Heo6c8ea892010-09-01 17:50:07 +0200389 /* link reports offline after LPM */
390 link->flags |= ATA_LFLAG_NO_LPM;
391
Gwendal Grignou7a46c072011-10-19 17:17:02 -0700392 /* Class code report is unreliable. */
Tejun Heo3af9a772007-09-23 13:19:54 +0900393 if (link->pmp < 5)
Gwendal Grignou7a46c072011-10-19 17:17:02 -0700394 link->flags |= ATA_LFLAG_ASSUME_ATA;
Tejun Heo3af9a772007-09-23 13:19:54 +0900395
396 /* port 5 is for SEMB device and it doesn't like SRST */
397 if (link->pmp == 5)
398 link->flags |= ATA_LFLAG_NO_SRST |
399 ATA_LFLAG_ASSUME_SEMB;
400 }
401 } else if (vendor == 0x1095 && devid == 0x4723) {
402 /* sil4723 quirks */
Tejun Heo1eca4362008-11-03 20:03:17 +0900403 ata_for_each_link(link, ap, EDGE) {
Tejun Heo6c8ea892010-09-01 17:50:07 +0200404 /* link reports offline after LPM */
405 link->flags |= ATA_LFLAG_NO_LPM;
406
Tejun Heo3af9a772007-09-23 13:19:54 +0900407 /* class code report is unreliable */
408 if (link->pmp < 2)
409 link->flags |= ATA_LFLAG_ASSUME_ATA;
410
411 /* the config device at port 2 locks up on SRST */
412 if (link->pmp == 2)
413 link->flags |= ATA_LFLAG_NO_SRST |
414 ATA_LFLAG_ASSUME_ATA;
415 }
416 } else if (vendor == 0x1095 && devid == 0x4726) {
417 /* sil4726 quirks */
Tejun Heo1eca4362008-11-03 20:03:17 +0900418 ata_for_each_link(link, ap, EDGE) {
Tejun Heo6c8ea892010-09-01 17:50:07 +0200419 /* link reports offline after LPM */
420 link->flags |= ATA_LFLAG_NO_LPM;
421
Tejun Heo80483072008-01-10 13:38:46 +0900422 /* Class code report is unreliable and SRST
423 * times out under certain configurations.
424 * Config device can be at port 0 or 5 and
425 * locks up on SRST.
Tejun Heo3af9a772007-09-23 13:19:54 +0900426 */
Tejun Heo80483072008-01-10 13:38:46 +0900427 if (link->pmp <= 5)
Tejun Heo3af9a772007-09-23 13:19:54 +0900428 link->flags |= ATA_LFLAG_NO_SRST |
429 ATA_LFLAG_ASSUME_ATA;
430
431 /* Port 6 is for SEMB device which doesn't
432 * like SRST either.
433 */
434 if (link->pmp == 6)
435 link->flags |= ATA_LFLAG_NO_SRST |
436 ATA_LFLAG_ASSUME_SEMB;
437 }
438 } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 ||
439 devid == 0x5734 || devid == 0x5744)) {
440 /* sil5723/5744 quirks */
441
442 /* sil5723/5744 has either two or three downstream
443 * ports depending on operation mode. The last port
444 * is empty if any actual IO device is available or
445 * occupied by a pseudo configuration device
446 * otherwise. Don't try hard to recover it.
447 */
448 ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY;
Pavel Herrmann0afc6f52011-04-28 22:32:54 +0200449 } else if (vendor == 0x197b && devid == 0x2352) {
450 /* chip found in Thermaltake BlackX Duet, jmicron JMB350? */
451 ata_for_each_link(link, ap, EDGE) {
452 /* SRST breaks detection and disks get misclassified
453 * LPM disabled to avoid potential problems
454 */
455 link->flags |= ATA_LFLAG_NO_LPM |
456 ATA_LFLAG_NO_SRST |
457 ATA_LFLAG_ASSUME_ATA;
458 }
Tejun Heo3af9a772007-09-23 13:19:54 +0900459 }
460}
461
462/**
463 * sata_pmp_attach - attach a SATA PMP device
464 * @dev: SATA PMP device to attach
465 *
466 * Configure and attach SATA PMP device @dev. This function is
467 * also responsible for allocating and initializing PMP links.
468 *
469 * LOCKING:
470 * Kernel thread context (may sleep).
471 *
472 * RETURNS:
473 * 0 on success, -errno on failure.
474 */
475int sata_pmp_attach(struct ata_device *dev)
476{
477 struct ata_link *link = dev->link;
478 struct ata_port *ap = link->ap;
479 unsigned long flags;
480 struct ata_link *tlink;
481 int rc;
482
483 /* is it hanging off the right place? */
Tejun Heo071f44b2008-04-07 22:47:22 +0900484 if (!sata_pmp_supported(ap)) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700485 ata_dev_err(dev, "host does not support Port Multiplier\n");
Tejun Heo3af9a772007-09-23 13:19:54 +0900486 return -EINVAL;
487 }
488
489 if (!ata_is_host_link(link)) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700490 ata_dev_err(dev, "Port Multipliers cannot be nested\n");
Tejun Heo3af9a772007-09-23 13:19:54 +0900491 return -EINVAL;
492 }
493
494 if (dev->devno) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700495 ata_dev_err(dev, "Port Multiplier must be the first device\n");
Tejun Heo3af9a772007-09-23 13:19:54 +0900496 return -EINVAL;
497 }
498
499 WARN_ON(link->pmp != 0);
500 link->pmp = SATA_PMP_CTRL_PORT;
501
502 /* read GSCR block */
503 rc = sata_pmp_read_gscr(dev, dev->gscr);
504 if (rc)
505 goto fail;
506
507 /* config PMP */
508 rc = sata_pmp_configure(dev, 1);
509 if (rc)
510 goto fail;
511
512 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr));
513 if (rc) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700514 ata_dev_info(dev, "failed to initialize PMP links\n");
Tejun Heo3af9a772007-09-23 13:19:54 +0900515 goto fail;
516 }
517
518 /* attach it */
519 spin_lock_irqsave(ap->lock, flags);
520 WARN_ON(ap->nr_pmp_links);
521 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr);
522 spin_unlock_irqrestore(ap->lock, flags);
523
524 sata_pmp_quirks(ap);
525
526 if (ap->ops->pmp_attach)
527 ap->ops->pmp_attach(ap);
528
Tejun Heo1eca4362008-11-03 20:03:17 +0900529 ata_for_each_link(tlink, ap, EDGE)
Tejun Heo3af9a772007-09-23 13:19:54 +0900530 sata_link_init_spd(tlink);
531
Tejun Heod0df8b5d2007-09-23 13:19:54 +0900532 ata_acpi_associate_sata_port(ap);
533
Tejun Heo3af9a772007-09-23 13:19:54 +0900534 return 0;
535
536 fail:
537 link->pmp = 0;
538 return rc;
539}
540
541/**
542 * sata_pmp_detach - detach a SATA PMP device
543 * @dev: SATA PMP device to detach
544 *
545 * Detach SATA PMP device @dev. This function is also
546 * responsible for deconfiguring PMP links.
547 *
548 * LOCKING:
549 * Kernel thread context (may sleep).
550 */
551static void sata_pmp_detach(struct ata_device *dev)
552{
553 struct ata_link *link = dev->link;
554 struct ata_port *ap = link->ap;
555 struct ata_link *tlink;
556 unsigned long flags;
557
Joe Perchesa9a79df2011-04-15 15:51:59 -0700558 ata_dev_info(dev, "Port Multiplier detaching\n");
Tejun Heo3af9a772007-09-23 13:19:54 +0900559
560 WARN_ON(!ata_is_host_link(link) || dev->devno ||
561 link->pmp != SATA_PMP_CTRL_PORT);
562
563 if (ap->ops->pmp_detach)
564 ap->ops->pmp_detach(ap);
565
Tejun Heo1eca4362008-11-03 20:03:17 +0900566 ata_for_each_link(tlink, ap, EDGE)
Tejun Heo3af9a772007-09-23 13:19:54 +0900567 ata_eh_detach_dev(tlink->device);
568
569 spin_lock_irqsave(ap->lock, flags);
570 ap->nr_pmp_links = 0;
571 link->pmp = 0;
572 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heod0df8b5d2007-09-23 13:19:54 +0900573
574 ata_acpi_associate_sata_port(ap);
Tejun Heo3af9a772007-09-23 13:19:54 +0900575}
576
577/**
578 * sata_pmp_same_pmp - does new GSCR matches the configured PMP?
579 * @dev: PMP device to compare against
580 * @new_gscr: GSCR block of the new device
581 *
582 * Compare @new_gscr against @dev and determine whether @dev is
583 * the PMP described by @new_gscr.
584 *
585 * LOCKING:
586 * None.
587 *
588 * RETURNS:
589 * 1 if @dev matches @new_gscr, 0 otherwise.
590 */
591static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr)
592{
593 const u32 *old_gscr = dev->gscr;
594 u16 old_vendor, new_vendor, old_devid, new_devid;
595 int old_nr_ports, new_nr_ports;
596
597 old_vendor = sata_pmp_gscr_vendor(old_gscr);
598 new_vendor = sata_pmp_gscr_vendor(new_gscr);
599 old_devid = sata_pmp_gscr_devid(old_gscr);
600 new_devid = sata_pmp_gscr_devid(new_gscr);
601 old_nr_ports = sata_pmp_gscr_ports(old_gscr);
602 new_nr_ports = sata_pmp_gscr_ports(new_gscr);
603
604 if (old_vendor != new_vendor) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700605 ata_dev_info(dev,
606 "Port Multiplier vendor mismatch '0x%x' != '0x%x'\n",
607 old_vendor, new_vendor);
Tejun Heo3af9a772007-09-23 13:19:54 +0900608 return 0;
609 }
610
611 if (old_devid != new_devid) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700612 ata_dev_info(dev,
613 "Port Multiplier device ID mismatch '0x%x' != '0x%x'\n",
614 old_devid, new_devid);
Tejun Heo3af9a772007-09-23 13:19:54 +0900615 return 0;
616 }
617
618 if (old_nr_ports != new_nr_ports) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700619 ata_dev_info(dev,
620 "Port Multiplier nr_ports mismatch '0x%x' != '0x%x'\n",
621 old_nr_ports, new_nr_ports);
Tejun Heo3af9a772007-09-23 13:19:54 +0900622 return 0;
623 }
624
625 return 1;
626}
627
628/**
629 * sata_pmp_revalidate - revalidate SATA PMP
630 * @dev: PMP device to revalidate
631 * @new_class: new class code
632 *
633 * Re-read GSCR block and make sure @dev is still attached to the
634 * port and properly configured.
635 *
636 * LOCKING:
637 * Kernel thread context (may sleep).
638 *
639 * RETURNS:
640 * 0 on success, -errno otherwise.
641 */
642static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class)
643{
644 struct ata_link *link = dev->link;
645 struct ata_port *ap = link->ap;
646 u32 *gscr = (void *)ap->sector_buf;
647 int rc;
648
649 DPRINTK("ENTER\n");
650
651 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE);
652
653 if (!ata_dev_enabled(dev)) {
654 rc = -ENODEV;
655 goto fail;
656 }
657
658 /* wrong class? */
659 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) {
660 rc = -ENODEV;
661 goto fail;
662 }
663
664 /* read GSCR */
665 rc = sata_pmp_read_gscr(dev, gscr);
666 if (rc)
667 goto fail;
668
669 /* is the pmp still there? */
670 if (!sata_pmp_same_pmp(dev, gscr)) {
671 rc = -ENODEV;
672 goto fail;
673 }
674
675 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS);
676
677 rc = sata_pmp_configure(dev, 0);
678 if (rc)
679 goto fail;
680
681 ata_eh_done(link, NULL, ATA_EH_REVALIDATE);
682
683 DPRINTK("EXIT, rc=0\n");
684 return 0;
685
686 fail:
Joe Perchesa9a79df2011-04-15 15:51:59 -0700687 ata_dev_err(dev, "PMP revalidation failed (errno=%d)\n", rc);
Tejun Heo3af9a772007-09-23 13:19:54 +0900688 DPRINTK("EXIT, rc=%d\n", rc);
689 return rc;
690}
691
692/**
693 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly
694 * @dev: PMP device to revalidate
695 *
696 * Make sure the attached PMP is accessible.
697 *
698 * LOCKING:
699 * Kernel thread context (may sleep).
700 *
701 * RETURNS:
702 * 0 on success, -errno otherwise.
703 */
704static int sata_pmp_revalidate_quick(struct ata_device *dev)
705{
Tejun Heob06ce3e2007-10-09 15:06:48 +0900706 unsigned int err_mask;
Tejun Heo3af9a772007-09-23 13:19:54 +0900707 u32 prod_id;
Tejun Heo3af9a772007-09-23 13:19:54 +0900708
Tejun Heob06ce3e2007-10-09 15:06:48 +0900709 err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id);
710 if (err_mask) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700711 ata_dev_err(dev,
712 "failed to read PMP product ID (Emask=0x%x)\n",
713 err_mask);
Tejun Heob06ce3e2007-10-09 15:06:48 +0900714 return -EIO;
Tejun Heo3af9a772007-09-23 13:19:54 +0900715 }
716
717 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700718 ata_dev_err(dev, "PMP product ID mismatch\n");
Tejun Heo3af9a772007-09-23 13:19:54 +0900719 /* something weird is going on, request full PMP recovery */
720 return -EIO;
721 }
722
723 return 0;
724}
725
726/**
727 * sata_pmp_eh_recover_pmp - recover PMP
728 * @ap: ATA port PMP is attached to
729 * @prereset: prereset method (can be NULL)
730 * @softreset: softreset method
731 * @hardreset: hardreset method
732 * @postreset: postreset method (can be NULL)
733 *
734 * Recover PMP attached to @ap. Recovery procedure is somewhat
735 * similar to that of ata_eh_recover() except that reset should
736 * always be performed in hard->soft sequence and recovery
737 * failure results in PMP detachment.
738 *
739 * LOCKING:
740 * Kernel thread context (may sleep).
741 *
742 * RETURNS:
743 * 0 on success, -errno on failure.
744 */
745static int sata_pmp_eh_recover_pmp(struct ata_port *ap,
746 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
747 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
748{
749 struct ata_link *link = &ap->link;
750 struct ata_eh_context *ehc = &link->eh_context;
751 struct ata_device *dev = link->device;
752 int tries = ATA_EH_PMP_TRIES;
753 int detach = 0, rc = 0;
754 int reval_failed = 0;
755
756 DPRINTK("ENTER\n");
757
758 if (dev->flags & ATA_DFLAG_DETACH) {
759 detach = 1;
760 goto fail;
761 }
762
763 retry:
764 ehc->classes[0] = ATA_DEV_UNKNOWN;
765
Tejun Heocf480622008-01-24 00:05:14 +0900766 if (ehc->i.action & ATA_EH_RESET) {
Tejun Heo3af9a772007-09-23 13:19:54 +0900767 struct ata_link *tlink;
768
Tejun Heo3af9a772007-09-23 13:19:54 +0900769 /* reset */
Tejun Heo3af9a772007-09-23 13:19:54 +0900770 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset,
771 postreset);
772 if (rc) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700773 ata_link_err(link, "failed to reset PMP, giving up\n");
Tejun Heo3af9a772007-09-23 13:19:54 +0900774 goto fail;
775 }
776
Tejun Heo3af9a772007-09-23 13:19:54 +0900777 /* PMP is reset, SErrors cannot be trusted, scan all */
Tejun Heo1eca4362008-11-03 20:03:17 +0900778 ata_for_each_link(tlink, ap, EDGE) {
Tejun Heob558edd2008-01-24 00:05:14 +0900779 struct ata_eh_context *ehc = &tlink->eh_context;
780
781 ehc->i.probe_mask |= ATA_ALL_DEVICES;
782 ehc->i.action |= ATA_EH_RESET;
783 }
Tejun Heo3af9a772007-09-23 13:19:54 +0900784 }
785
786 /* If revalidation is requested, revalidate and reconfigure;
787 * otherwise, do quick revalidation.
788 */
789 if (ehc->i.action & ATA_EH_REVALIDATE)
790 rc = sata_pmp_revalidate(dev, ehc->classes[0]);
791 else
792 rc = sata_pmp_revalidate_quick(dev);
793
794 if (rc) {
795 tries--;
796
797 if (rc == -ENODEV) {
Tejun Heob558edd2008-01-24 00:05:14 +0900798 ehc->i.probe_mask |= ATA_ALL_DEVICES;
Tejun Heo3af9a772007-09-23 13:19:54 +0900799 detach = 1;
800 /* give it just two more chances */
801 tries = min(tries, 2);
802 }
803
804 if (tries) {
Tejun Heo3af9a772007-09-23 13:19:54 +0900805 /* consecutive revalidation failures? speed down */
806 if (reval_failed)
Tejun Heoa07d4992009-01-29 20:31:33 +0900807 sata_down_spd_limit(link, 0);
Tejun Heo3af9a772007-09-23 13:19:54 +0900808 else
809 reval_failed = 1;
810
Tejun Heocf480622008-01-24 00:05:14 +0900811 ehc->i.action |= ATA_EH_RESET;
Tejun Heo3af9a772007-09-23 13:19:54 +0900812 goto retry;
813 } else {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700814 ata_dev_err(dev,
815 "failed to recover PMP after %d tries, giving up\n",
816 ATA_EH_PMP_TRIES);
Tejun Heo3af9a772007-09-23 13:19:54 +0900817 goto fail;
818 }
819 }
820
821 /* okay, PMP resurrected */
822 ehc->i.flags = 0;
823
824 DPRINTK("EXIT, rc=0\n");
825 return 0;
826
827 fail:
828 sata_pmp_detach(dev);
829 if (detach)
830 ata_eh_detach_dev(dev);
831 else
832 ata_dev_disable(dev);
833
834 DPRINTK("EXIT, rc=%d\n", rc);
835 return rc;
836}
837
838static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap)
839{
840 struct ata_link *link;
841 unsigned long flags;
842 int rc;
843
844 spin_lock_irqsave(ap->lock, flags);
845
Tejun Heo1eca4362008-11-03 20:03:17 +0900846 ata_for_each_link(link, ap, EDGE) {
Tejun Heo3af9a772007-09-23 13:19:54 +0900847 if (!(link->flags & ATA_LFLAG_DISABLED))
848 continue;
849
850 spin_unlock_irqrestore(ap->lock, flags);
851
852 /* Some PMPs require hardreset sequence to get
853 * SError.N working.
854 */
Tejun Heocf480622008-01-24 00:05:14 +0900855 sata_link_hardreset(link, sata_deb_timing_normal,
Tejun Heo341c2c92008-05-20 02:17:51 +0900856 ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK),
857 NULL, NULL);
Tejun Heo3af9a772007-09-23 13:19:54 +0900858
859 /* unconditionally clear SError.N */
860 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
861 if (rc) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700862 ata_link_err(link,
863 "failed to clear SError.N (errno=%d)\n",
864 rc);
Tejun Heo3af9a772007-09-23 13:19:54 +0900865 return rc;
866 }
867
868 spin_lock_irqsave(ap->lock, flags);
869 }
870
871 spin_unlock_irqrestore(ap->lock, flags);
872
873 return 0;
874}
875
876static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries)
877{
878 struct ata_port *ap = link->ap;
879 unsigned long flags;
880
881 if (link_tries[link->pmp] && --link_tries[link->pmp])
882 return 1;
883
884 /* disable this link */
885 if (!(link->flags & ATA_LFLAG_DISABLED)) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700886 ata_link_warn(link,
Tejun Heo3af9a772007-09-23 13:19:54 +0900887 "failed to recover link after %d tries, disabling\n",
888 ATA_EH_PMP_LINK_TRIES);
889
890 spin_lock_irqsave(ap->lock, flags);
891 link->flags |= ATA_LFLAG_DISABLED;
892 spin_unlock_irqrestore(ap->lock, flags);
893 }
894
895 ata_dev_disable(link->device);
896 link->eh_context.i.action = 0;
897
898 return 0;
899}
900
901/**
902 * sata_pmp_eh_recover - recover PMP-enabled port
903 * @ap: ATA port to recover
Tejun Heo3af9a772007-09-23 13:19:54 +0900904 *
905 * Drive EH recovery operation for PMP enabled port @ap. This
906 * function recovers host and PMP ports with proper retrials and
907 * fallbacks. Actual recovery operations are performed using
908 * ata_eh_recover() and sata_pmp_eh_recover_pmp().
909 *
910 * LOCKING:
911 * Kernel thread context (may sleep).
912 *
913 * RETURNS:
914 * 0 on success, -errno on failure.
915 */
Tejun Heoa1efdab2008-03-25 12:22:50 +0900916static int sata_pmp_eh_recover(struct ata_port *ap)
Tejun Heo3af9a772007-09-23 13:19:54 +0900917{
Tejun Heoa1efdab2008-03-25 12:22:50 +0900918 struct ata_port_operations *ops = ap->ops;
Tejun Heo3af9a772007-09-23 13:19:54 +0900919 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS];
920 struct ata_link *pmp_link = &ap->link;
921 struct ata_device *pmp_dev = pmp_link->device;
922 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context;
Tejun Heof1bbfb92008-05-19 01:15:11 +0900923 u32 *gscr = pmp_dev->gscr;
Tejun Heo3af9a772007-09-23 13:19:54 +0900924 struct ata_link *link;
925 struct ata_device *dev;
Tejun Heob06ce3e2007-10-09 15:06:48 +0900926 unsigned int err_mask;
Tejun Heo3af9a772007-09-23 13:19:54 +0900927 u32 gscr_error, sntf;
928 int cnt, rc;
929
930 pmp_tries = ATA_EH_PMP_TRIES;
Tejun Heo1eca4362008-11-03 20:03:17 +0900931 ata_for_each_link(link, ap, EDGE)
Tejun Heo3af9a772007-09-23 13:19:54 +0900932 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
933
934 retry:
935 /* PMP attached? */
Tejun Heo071f44b2008-04-07 22:47:22 +0900936 if (!sata_pmp_attached(ap)) {
Tejun Heoa1efdab2008-03-25 12:22:50 +0900937 rc = ata_eh_recover(ap, ops->prereset, ops->softreset,
938 ops->hardreset, ops->postreset, NULL);
Tejun Heo3af9a772007-09-23 13:19:54 +0900939 if (rc) {
Tejun Heo1eca4362008-11-03 20:03:17 +0900940 ata_for_each_dev(dev, &ap->link, ALL)
Tejun Heo3af9a772007-09-23 13:19:54 +0900941 ata_dev_disable(dev);
942 return rc;
943 }
944
945 if (pmp_dev->class != ATA_DEV_PMP)
946 return 0;
947
948 /* new PMP online */
Tejun Heo1eca4362008-11-03 20:03:17 +0900949 ata_for_each_link(link, ap, EDGE)
Tejun Heo3af9a772007-09-23 13:19:54 +0900950 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
951
952 /* fall through */
953 }
954
955 /* recover pmp */
Tejun Heoa1efdab2008-03-25 12:22:50 +0900956 rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset,
957 ops->hardreset, ops->postreset);
Tejun Heo3af9a772007-09-23 13:19:54 +0900958 if (rc)
959 goto pmp_fail;
960
Tejun Heof1bbfb92008-05-19 01:15:11 +0900961 /* PHY event notification can disturb reset and other recovery
962 * operations. Turn it off.
963 */
964 if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) {
965 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY;
966
967 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
968 gscr[SATA_PMP_GSCR_FEAT_EN]);
969 if (err_mask) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700970 ata_link_warn(pmp_link,
Tejun Heof1bbfb92008-05-19 01:15:11 +0900971 "failed to disable NOTIFY (err_mask=0x%x)\n",
972 err_mask);
973 goto pmp_fail;
974 }
975 }
976
Tejun Heo3af9a772007-09-23 13:19:54 +0900977 /* handle disabled links */
978 rc = sata_pmp_eh_handle_disabled_links(ap);
979 if (rc)
980 goto pmp_fail;
981
982 /* recover links */
Tejun Heoa1efdab2008-03-25 12:22:50 +0900983 rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset,
984 ops->pmp_hardreset, ops->pmp_postreset, &link);
Tejun Heo3af9a772007-09-23 13:19:54 +0900985 if (rc)
986 goto link_fail;
987
Tejun Heo3af9a772007-09-23 13:19:54 +0900988 /* clear SNotification */
989 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
990 if (rc == 0)
991 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
992
Tejun Heo6c8ea892010-09-01 17:50:07 +0200993 /*
994 * If LPM is active on any fan-out port, hotplug wouldn't
995 * work. Return w/ PHY event notification disabled.
996 */
997 ata_for_each_link(link, ap, EDGE)
998 if (link->lpm_policy > ATA_LPM_MAX_POWER)
999 return 0;
1000
1001 /*
1002 * Connection status might have changed while resetting other
1003 * links, enable notification and check SATA_PMP_GSCR_ERROR
1004 * before returning.
1005 */
1006
Tejun Heo3af9a772007-09-23 13:19:54 +09001007 /* enable notification */
1008 if (pmp_dev->flags & ATA_DFLAG_AN) {
Tejun Heof1bbfb92008-05-19 01:15:11 +09001009 gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY;
Tejun Heo3af9a772007-09-23 13:19:54 +09001010
Tejun Heof1bbfb92008-05-19 01:15:11 +09001011 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
1012 gscr[SATA_PMP_GSCR_FEAT_EN]);
Tejun Heob06ce3e2007-10-09 15:06:48 +09001013 if (err_mask) {
Joe Perchesa9a79df2011-04-15 15:51:59 -07001014 ata_dev_err(pmp_dev,
1015 "failed to write PMP_FEAT_EN (Emask=0x%x)\n",
1016 err_mask);
Tejun Heob06ce3e2007-10-09 15:06:48 +09001017 rc = -EIO;
Tejun Heo3af9a772007-09-23 13:19:54 +09001018 goto pmp_fail;
1019 }
1020 }
1021
1022 /* check GSCR_ERROR */
Tejun Heob06ce3e2007-10-09 15:06:48 +09001023 err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error);
1024 if (err_mask) {
Joe Perchesa9a79df2011-04-15 15:51:59 -07001025 ata_dev_err(pmp_dev,
1026 "failed to read PMP_GSCR_ERROR (Emask=0x%x)\n",
1027 err_mask);
Tejun Heob06ce3e2007-10-09 15:06:48 +09001028 rc = -EIO;
Tejun Heo3af9a772007-09-23 13:19:54 +09001029 goto pmp_fail;
1030 }
1031
1032 cnt = 0;
Tejun Heo1eca4362008-11-03 20:03:17 +09001033 ata_for_each_link(link, ap, EDGE) {
Tejun Heo3af9a772007-09-23 13:19:54 +09001034 if (!(gscr_error & (1 << link->pmp)))
1035 continue;
1036
1037 if (sata_pmp_handle_link_fail(link, link_tries)) {
1038 ata_ehi_hotplugged(&link->eh_context.i);
1039 cnt++;
1040 } else {
Joe Perchesa9a79df2011-04-15 15:51:59 -07001041 ata_link_warn(link,
1042 "PHY status changed but maxed out on retries, giving up\n");
1043 ata_link_warn(link,
1044 "Manually issue scan to resume this link\n");
Tejun Heo3af9a772007-09-23 13:19:54 +09001045 }
1046 }
1047
1048 if (cnt) {
Joe Perchesa9a79df2011-04-15 15:51:59 -07001049 ata_port_info(ap,
1050 "PMP SError.N set for some ports, repeating recovery\n");
Tejun Heo3af9a772007-09-23 13:19:54 +09001051 goto retry;
1052 }
1053
1054 return 0;
1055
1056 link_fail:
1057 if (sata_pmp_handle_link_fail(link, link_tries)) {
Tejun Heocf480622008-01-24 00:05:14 +09001058 pmp_ehc->i.action |= ATA_EH_RESET;
Tejun Heo3af9a772007-09-23 13:19:54 +09001059 goto retry;
1060 }
1061
1062 /* fall through */
1063 pmp_fail:
1064 /* Control always ends up here after detaching PMP. Shut up
1065 * and return if we're unloading.
1066 */
1067 if (ap->pflags & ATA_PFLAG_UNLOADING)
1068 return rc;
1069
Tejun Heo071f44b2008-04-07 22:47:22 +09001070 if (!sata_pmp_attached(ap))
Tejun Heo3af9a772007-09-23 13:19:54 +09001071 goto retry;
1072
1073 if (--pmp_tries) {
Tejun Heocf480622008-01-24 00:05:14 +09001074 pmp_ehc->i.action |= ATA_EH_RESET;
Tejun Heo3af9a772007-09-23 13:19:54 +09001075 goto retry;
1076 }
1077
Joe Perchesa9a79df2011-04-15 15:51:59 -07001078 ata_port_err(ap, "failed to recover PMP after %d tries, giving up\n",
1079 ATA_EH_PMP_TRIES);
Tejun Heo3af9a772007-09-23 13:19:54 +09001080 sata_pmp_detach(pmp_dev);
1081 ata_dev_disable(pmp_dev);
1082
1083 return rc;
1084}
1085
1086/**
Tejun Heoa1efdab2008-03-25 12:22:50 +09001087 * sata_pmp_error_handler - do standard error handling for PMP-enabled host
Tejun Heo3af9a772007-09-23 13:19:54 +09001088 * @ap: host port to handle error for
Tejun Heo3af9a772007-09-23 13:19:54 +09001089 *
1090 * Perform standard error handling sequence for PMP-enabled host
1091 * @ap.
1092 *
1093 * LOCKING:
1094 * Kernel thread context (may sleep).
1095 */
Tejun Heoa1efdab2008-03-25 12:22:50 +09001096void sata_pmp_error_handler(struct ata_port *ap)
Tejun Heo3af9a772007-09-23 13:19:54 +09001097{
1098 ata_eh_autopsy(ap);
1099 ata_eh_report(ap);
Tejun Heoa1efdab2008-03-25 12:22:50 +09001100 sata_pmp_eh_recover(ap);
Tejun Heo3af9a772007-09-23 13:19:54 +09001101 ata_eh_finish(ap);
1102}
Tejun Heo48515f62008-04-07 22:47:21 +09001103
1104EXPORT_SYMBOL_GPL(sata_pmp_port_ops);
1105EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
1106EXPORT_SYMBOL_GPL(sata_pmp_error_handler);