blob: 61c59ee45ce9275af707d68a5328d276863c57df [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
532 return 0;
533
534 fail:
535 link->pmp = 0;
536 return rc;
537}
538
539/**
540 * sata_pmp_detach - detach a SATA PMP device
541 * @dev: SATA PMP device to detach
542 *
543 * Detach SATA PMP device @dev. This function is also
544 * responsible for deconfiguring PMP links.
545 *
546 * LOCKING:
547 * Kernel thread context (may sleep).
548 */
549static void sata_pmp_detach(struct ata_device *dev)
550{
551 struct ata_link *link = dev->link;
552 struct ata_port *ap = link->ap;
553 struct ata_link *tlink;
554 unsigned long flags;
555
Joe Perchesa9a79df2011-04-15 15:51:59 -0700556 ata_dev_info(dev, "Port Multiplier detaching\n");
Tejun Heo3af9a772007-09-23 13:19:54 +0900557
558 WARN_ON(!ata_is_host_link(link) || dev->devno ||
559 link->pmp != SATA_PMP_CTRL_PORT);
560
561 if (ap->ops->pmp_detach)
562 ap->ops->pmp_detach(ap);
563
Tejun Heo1eca4362008-11-03 20:03:17 +0900564 ata_for_each_link(tlink, ap, EDGE)
Tejun Heo3af9a772007-09-23 13:19:54 +0900565 ata_eh_detach_dev(tlink->device);
566
567 spin_lock_irqsave(ap->lock, flags);
568 ap->nr_pmp_links = 0;
569 link->pmp = 0;
570 spin_unlock_irqrestore(ap->lock, flags);
Tejun Heo3af9a772007-09-23 13:19:54 +0900571}
572
573/**
574 * sata_pmp_same_pmp - does new GSCR matches the configured PMP?
575 * @dev: PMP device to compare against
576 * @new_gscr: GSCR block of the new device
577 *
578 * Compare @new_gscr against @dev and determine whether @dev is
579 * the PMP described by @new_gscr.
580 *
581 * LOCKING:
582 * None.
583 *
584 * RETURNS:
585 * 1 if @dev matches @new_gscr, 0 otherwise.
586 */
587static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr)
588{
589 const u32 *old_gscr = dev->gscr;
590 u16 old_vendor, new_vendor, old_devid, new_devid;
591 int old_nr_ports, new_nr_ports;
592
593 old_vendor = sata_pmp_gscr_vendor(old_gscr);
594 new_vendor = sata_pmp_gscr_vendor(new_gscr);
595 old_devid = sata_pmp_gscr_devid(old_gscr);
596 new_devid = sata_pmp_gscr_devid(new_gscr);
597 old_nr_ports = sata_pmp_gscr_ports(old_gscr);
598 new_nr_ports = sata_pmp_gscr_ports(new_gscr);
599
600 if (old_vendor != new_vendor) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700601 ata_dev_info(dev,
602 "Port Multiplier vendor mismatch '0x%x' != '0x%x'\n",
603 old_vendor, new_vendor);
Tejun Heo3af9a772007-09-23 13:19:54 +0900604 return 0;
605 }
606
607 if (old_devid != new_devid) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700608 ata_dev_info(dev,
609 "Port Multiplier device ID mismatch '0x%x' != '0x%x'\n",
610 old_devid, new_devid);
Tejun Heo3af9a772007-09-23 13:19:54 +0900611 return 0;
612 }
613
614 if (old_nr_ports != new_nr_ports) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700615 ata_dev_info(dev,
616 "Port Multiplier nr_ports mismatch '0x%x' != '0x%x'\n",
617 old_nr_ports, new_nr_ports);
Tejun Heo3af9a772007-09-23 13:19:54 +0900618 return 0;
619 }
620
621 return 1;
622}
623
624/**
625 * sata_pmp_revalidate - revalidate SATA PMP
626 * @dev: PMP device to revalidate
627 * @new_class: new class code
628 *
629 * Re-read GSCR block and make sure @dev is still attached to the
630 * port and properly configured.
631 *
632 * LOCKING:
633 * Kernel thread context (may sleep).
634 *
635 * RETURNS:
636 * 0 on success, -errno otherwise.
637 */
638static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class)
639{
640 struct ata_link *link = dev->link;
641 struct ata_port *ap = link->ap;
642 u32 *gscr = (void *)ap->sector_buf;
643 int rc;
644
645 DPRINTK("ENTER\n");
646
647 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE);
648
649 if (!ata_dev_enabled(dev)) {
650 rc = -ENODEV;
651 goto fail;
652 }
653
654 /* wrong class? */
655 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) {
656 rc = -ENODEV;
657 goto fail;
658 }
659
660 /* read GSCR */
661 rc = sata_pmp_read_gscr(dev, gscr);
662 if (rc)
663 goto fail;
664
665 /* is the pmp still there? */
666 if (!sata_pmp_same_pmp(dev, gscr)) {
667 rc = -ENODEV;
668 goto fail;
669 }
670
671 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS);
672
673 rc = sata_pmp_configure(dev, 0);
674 if (rc)
675 goto fail;
676
677 ata_eh_done(link, NULL, ATA_EH_REVALIDATE);
678
679 DPRINTK("EXIT, rc=0\n");
680 return 0;
681
682 fail:
Joe Perchesa9a79df2011-04-15 15:51:59 -0700683 ata_dev_err(dev, "PMP revalidation failed (errno=%d)\n", rc);
Tejun Heo3af9a772007-09-23 13:19:54 +0900684 DPRINTK("EXIT, rc=%d\n", rc);
685 return rc;
686}
687
688/**
689 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly
690 * @dev: PMP device to revalidate
691 *
692 * Make sure the attached PMP is accessible.
693 *
694 * LOCKING:
695 * Kernel thread context (may sleep).
696 *
697 * RETURNS:
698 * 0 on success, -errno otherwise.
699 */
700static int sata_pmp_revalidate_quick(struct ata_device *dev)
701{
Tejun Heob06ce3e2007-10-09 15:06:48 +0900702 unsigned int err_mask;
Tejun Heo3af9a772007-09-23 13:19:54 +0900703 u32 prod_id;
Tejun Heo3af9a772007-09-23 13:19:54 +0900704
Tejun Heob06ce3e2007-10-09 15:06:48 +0900705 err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id);
706 if (err_mask) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700707 ata_dev_err(dev,
708 "failed to read PMP product ID (Emask=0x%x)\n",
709 err_mask);
Tejun Heob06ce3e2007-10-09 15:06:48 +0900710 return -EIO;
Tejun Heo3af9a772007-09-23 13:19:54 +0900711 }
712
713 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700714 ata_dev_err(dev, "PMP product ID mismatch\n");
Tejun Heo3af9a772007-09-23 13:19:54 +0900715 /* something weird is going on, request full PMP recovery */
716 return -EIO;
717 }
718
719 return 0;
720}
721
722/**
723 * sata_pmp_eh_recover_pmp - recover PMP
724 * @ap: ATA port PMP is attached to
725 * @prereset: prereset method (can be NULL)
726 * @softreset: softreset method
727 * @hardreset: hardreset method
728 * @postreset: postreset method (can be NULL)
729 *
730 * Recover PMP attached to @ap. Recovery procedure is somewhat
731 * similar to that of ata_eh_recover() except that reset should
732 * always be performed in hard->soft sequence and recovery
733 * failure results in PMP detachment.
734 *
735 * LOCKING:
736 * Kernel thread context (may sleep).
737 *
738 * RETURNS:
739 * 0 on success, -errno on failure.
740 */
741static int sata_pmp_eh_recover_pmp(struct ata_port *ap,
742 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
743 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
744{
745 struct ata_link *link = &ap->link;
746 struct ata_eh_context *ehc = &link->eh_context;
747 struct ata_device *dev = link->device;
748 int tries = ATA_EH_PMP_TRIES;
749 int detach = 0, rc = 0;
750 int reval_failed = 0;
751
752 DPRINTK("ENTER\n");
753
754 if (dev->flags & ATA_DFLAG_DETACH) {
755 detach = 1;
756 goto fail;
757 }
758
759 retry:
760 ehc->classes[0] = ATA_DEV_UNKNOWN;
761
Tejun Heocf480622008-01-24 00:05:14 +0900762 if (ehc->i.action & ATA_EH_RESET) {
Tejun Heo3af9a772007-09-23 13:19:54 +0900763 struct ata_link *tlink;
764
Tejun Heo3af9a772007-09-23 13:19:54 +0900765 /* reset */
Tejun Heo3af9a772007-09-23 13:19:54 +0900766 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset,
767 postreset);
768 if (rc) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700769 ata_link_err(link, "failed to reset PMP, giving up\n");
Tejun Heo3af9a772007-09-23 13:19:54 +0900770 goto fail;
771 }
772
Tejun Heo3af9a772007-09-23 13:19:54 +0900773 /* PMP is reset, SErrors cannot be trusted, scan all */
Tejun Heo1eca4362008-11-03 20:03:17 +0900774 ata_for_each_link(tlink, ap, EDGE) {
Tejun Heob558edd2008-01-24 00:05:14 +0900775 struct ata_eh_context *ehc = &tlink->eh_context;
776
777 ehc->i.probe_mask |= ATA_ALL_DEVICES;
778 ehc->i.action |= ATA_EH_RESET;
779 }
Tejun Heo3af9a772007-09-23 13:19:54 +0900780 }
781
782 /* If revalidation is requested, revalidate and reconfigure;
783 * otherwise, do quick revalidation.
784 */
785 if (ehc->i.action & ATA_EH_REVALIDATE)
786 rc = sata_pmp_revalidate(dev, ehc->classes[0]);
787 else
788 rc = sata_pmp_revalidate_quick(dev);
789
790 if (rc) {
791 tries--;
792
793 if (rc == -ENODEV) {
Tejun Heob558edd2008-01-24 00:05:14 +0900794 ehc->i.probe_mask |= ATA_ALL_DEVICES;
Tejun Heo3af9a772007-09-23 13:19:54 +0900795 detach = 1;
796 /* give it just two more chances */
797 tries = min(tries, 2);
798 }
799
800 if (tries) {
Tejun Heo3af9a772007-09-23 13:19:54 +0900801 /* consecutive revalidation failures? speed down */
802 if (reval_failed)
Tejun Heoa07d4992009-01-29 20:31:33 +0900803 sata_down_spd_limit(link, 0);
Tejun Heo3af9a772007-09-23 13:19:54 +0900804 else
805 reval_failed = 1;
806
Tejun Heocf480622008-01-24 00:05:14 +0900807 ehc->i.action |= ATA_EH_RESET;
Tejun Heo3af9a772007-09-23 13:19:54 +0900808 goto retry;
809 } else {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700810 ata_dev_err(dev,
811 "failed to recover PMP after %d tries, giving up\n",
812 ATA_EH_PMP_TRIES);
Tejun Heo3af9a772007-09-23 13:19:54 +0900813 goto fail;
814 }
815 }
816
817 /* okay, PMP resurrected */
818 ehc->i.flags = 0;
819
820 DPRINTK("EXIT, rc=0\n");
821 return 0;
822
823 fail:
824 sata_pmp_detach(dev);
825 if (detach)
826 ata_eh_detach_dev(dev);
827 else
828 ata_dev_disable(dev);
829
830 DPRINTK("EXIT, rc=%d\n", rc);
831 return rc;
832}
833
834static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap)
835{
836 struct ata_link *link;
837 unsigned long flags;
838 int rc;
839
840 spin_lock_irqsave(ap->lock, flags);
841
Tejun Heo1eca4362008-11-03 20:03:17 +0900842 ata_for_each_link(link, ap, EDGE) {
Tejun Heo3af9a772007-09-23 13:19:54 +0900843 if (!(link->flags & ATA_LFLAG_DISABLED))
844 continue;
845
846 spin_unlock_irqrestore(ap->lock, flags);
847
848 /* Some PMPs require hardreset sequence to get
849 * SError.N working.
850 */
Tejun Heocf480622008-01-24 00:05:14 +0900851 sata_link_hardreset(link, sata_deb_timing_normal,
Tejun Heo341c2c92008-05-20 02:17:51 +0900852 ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK),
853 NULL, NULL);
Tejun Heo3af9a772007-09-23 13:19:54 +0900854
855 /* unconditionally clear SError.N */
856 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
857 if (rc) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700858 ata_link_err(link,
859 "failed to clear SError.N (errno=%d)\n",
860 rc);
Tejun Heo3af9a772007-09-23 13:19:54 +0900861 return rc;
862 }
863
864 spin_lock_irqsave(ap->lock, flags);
865 }
866
867 spin_unlock_irqrestore(ap->lock, flags);
868
869 return 0;
870}
871
872static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries)
873{
874 struct ata_port *ap = link->ap;
875 unsigned long flags;
876
877 if (link_tries[link->pmp] && --link_tries[link->pmp])
878 return 1;
879
880 /* disable this link */
881 if (!(link->flags & ATA_LFLAG_DISABLED)) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700882 ata_link_warn(link,
Tejun Heo3af9a772007-09-23 13:19:54 +0900883 "failed to recover link after %d tries, disabling\n",
884 ATA_EH_PMP_LINK_TRIES);
885
886 spin_lock_irqsave(ap->lock, flags);
887 link->flags |= ATA_LFLAG_DISABLED;
888 spin_unlock_irqrestore(ap->lock, flags);
889 }
890
891 ata_dev_disable(link->device);
892 link->eh_context.i.action = 0;
893
894 return 0;
895}
896
897/**
898 * sata_pmp_eh_recover - recover PMP-enabled port
899 * @ap: ATA port to recover
Tejun Heo3af9a772007-09-23 13:19:54 +0900900 *
901 * Drive EH recovery operation for PMP enabled port @ap. This
902 * function recovers host and PMP ports with proper retrials and
903 * fallbacks. Actual recovery operations are performed using
904 * ata_eh_recover() and sata_pmp_eh_recover_pmp().
905 *
906 * LOCKING:
907 * Kernel thread context (may sleep).
908 *
909 * RETURNS:
910 * 0 on success, -errno on failure.
911 */
Tejun Heoa1efdab2008-03-25 12:22:50 +0900912static int sata_pmp_eh_recover(struct ata_port *ap)
Tejun Heo3af9a772007-09-23 13:19:54 +0900913{
Tejun Heoa1efdab2008-03-25 12:22:50 +0900914 struct ata_port_operations *ops = ap->ops;
Tejun Heo3af9a772007-09-23 13:19:54 +0900915 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS];
916 struct ata_link *pmp_link = &ap->link;
917 struct ata_device *pmp_dev = pmp_link->device;
918 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context;
Tejun Heof1bbfb92008-05-19 01:15:11 +0900919 u32 *gscr = pmp_dev->gscr;
Tejun Heo3af9a772007-09-23 13:19:54 +0900920 struct ata_link *link;
921 struct ata_device *dev;
Tejun Heob06ce3e2007-10-09 15:06:48 +0900922 unsigned int err_mask;
Tejun Heo3af9a772007-09-23 13:19:54 +0900923 u32 gscr_error, sntf;
924 int cnt, rc;
925
926 pmp_tries = ATA_EH_PMP_TRIES;
Tejun Heo1eca4362008-11-03 20:03:17 +0900927 ata_for_each_link(link, ap, EDGE)
Tejun Heo3af9a772007-09-23 13:19:54 +0900928 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
929
930 retry:
931 /* PMP attached? */
Tejun Heo071f44b2008-04-07 22:47:22 +0900932 if (!sata_pmp_attached(ap)) {
Tejun Heoa1efdab2008-03-25 12:22:50 +0900933 rc = ata_eh_recover(ap, ops->prereset, ops->softreset,
934 ops->hardreset, ops->postreset, NULL);
Tejun Heo3af9a772007-09-23 13:19:54 +0900935 if (rc) {
Tejun Heo1eca4362008-11-03 20:03:17 +0900936 ata_for_each_dev(dev, &ap->link, ALL)
Tejun Heo3af9a772007-09-23 13:19:54 +0900937 ata_dev_disable(dev);
938 return rc;
939 }
940
941 if (pmp_dev->class != ATA_DEV_PMP)
942 return 0;
943
944 /* new PMP online */
Tejun Heo1eca4362008-11-03 20:03:17 +0900945 ata_for_each_link(link, ap, EDGE)
Tejun Heo3af9a772007-09-23 13:19:54 +0900946 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
947
948 /* fall through */
949 }
950
951 /* recover pmp */
Tejun Heoa1efdab2008-03-25 12:22:50 +0900952 rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset,
953 ops->hardreset, ops->postreset);
Tejun Heo3af9a772007-09-23 13:19:54 +0900954 if (rc)
955 goto pmp_fail;
956
Tejun Heof1bbfb92008-05-19 01:15:11 +0900957 /* PHY event notification can disturb reset and other recovery
958 * operations. Turn it off.
959 */
960 if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) {
961 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY;
962
963 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
964 gscr[SATA_PMP_GSCR_FEAT_EN]);
965 if (err_mask) {
Joe Perchesa9a79df2011-04-15 15:51:59 -0700966 ata_link_warn(pmp_link,
Tejun Heof1bbfb92008-05-19 01:15:11 +0900967 "failed to disable NOTIFY (err_mask=0x%x)\n",
968 err_mask);
969 goto pmp_fail;
970 }
971 }
972
Tejun Heo3af9a772007-09-23 13:19:54 +0900973 /* handle disabled links */
974 rc = sata_pmp_eh_handle_disabled_links(ap);
975 if (rc)
976 goto pmp_fail;
977
978 /* recover links */
Tejun Heoa1efdab2008-03-25 12:22:50 +0900979 rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset,
980 ops->pmp_hardreset, ops->pmp_postreset, &link);
Tejun Heo3af9a772007-09-23 13:19:54 +0900981 if (rc)
982 goto link_fail;
983
Tejun Heo3af9a772007-09-23 13:19:54 +0900984 /* clear SNotification */
985 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
986 if (rc == 0)
987 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
988
Tejun Heo6c8ea892010-09-01 17:50:07 +0200989 /*
990 * If LPM is active on any fan-out port, hotplug wouldn't
991 * work. Return w/ PHY event notification disabled.
992 */
993 ata_for_each_link(link, ap, EDGE)
994 if (link->lpm_policy > ATA_LPM_MAX_POWER)
995 return 0;
996
997 /*
998 * Connection status might have changed while resetting other
999 * links, enable notification and check SATA_PMP_GSCR_ERROR
1000 * before returning.
1001 */
1002
Tejun Heo3af9a772007-09-23 13:19:54 +09001003 /* enable notification */
1004 if (pmp_dev->flags & ATA_DFLAG_AN) {
Tejun Heof1bbfb92008-05-19 01:15:11 +09001005 gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY;
Tejun Heo3af9a772007-09-23 13:19:54 +09001006
Tejun Heof1bbfb92008-05-19 01:15:11 +09001007 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
1008 gscr[SATA_PMP_GSCR_FEAT_EN]);
Tejun Heob06ce3e2007-10-09 15:06:48 +09001009 if (err_mask) {
Joe Perchesa9a79df2011-04-15 15:51:59 -07001010 ata_dev_err(pmp_dev,
1011 "failed to write PMP_FEAT_EN (Emask=0x%x)\n",
1012 err_mask);
Tejun Heob06ce3e2007-10-09 15:06:48 +09001013 rc = -EIO;
Tejun Heo3af9a772007-09-23 13:19:54 +09001014 goto pmp_fail;
1015 }
1016 }
1017
1018 /* check GSCR_ERROR */
Tejun Heob06ce3e2007-10-09 15:06:48 +09001019 err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error);
1020 if (err_mask) {
Joe Perchesa9a79df2011-04-15 15:51:59 -07001021 ata_dev_err(pmp_dev,
1022 "failed to read PMP_GSCR_ERROR (Emask=0x%x)\n",
1023 err_mask);
Tejun Heob06ce3e2007-10-09 15:06:48 +09001024 rc = -EIO;
Tejun Heo3af9a772007-09-23 13:19:54 +09001025 goto pmp_fail;
1026 }
1027
1028 cnt = 0;
Tejun Heo1eca4362008-11-03 20:03:17 +09001029 ata_for_each_link(link, ap, EDGE) {
Tejun Heo3af9a772007-09-23 13:19:54 +09001030 if (!(gscr_error & (1 << link->pmp)))
1031 continue;
1032
1033 if (sata_pmp_handle_link_fail(link, link_tries)) {
1034 ata_ehi_hotplugged(&link->eh_context.i);
1035 cnt++;
1036 } else {
Joe Perchesa9a79df2011-04-15 15:51:59 -07001037 ata_link_warn(link,
1038 "PHY status changed but maxed out on retries, giving up\n");
1039 ata_link_warn(link,
1040 "Manually issue scan to resume this link\n");
Tejun Heo3af9a772007-09-23 13:19:54 +09001041 }
1042 }
1043
1044 if (cnt) {
Joe Perchesa9a79df2011-04-15 15:51:59 -07001045 ata_port_info(ap,
1046 "PMP SError.N set for some ports, repeating recovery\n");
Tejun Heo3af9a772007-09-23 13:19:54 +09001047 goto retry;
1048 }
1049
1050 return 0;
1051
1052 link_fail:
1053 if (sata_pmp_handle_link_fail(link, link_tries)) {
Tejun Heocf480622008-01-24 00:05:14 +09001054 pmp_ehc->i.action |= ATA_EH_RESET;
Tejun Heo3af9a772007-09-23 13:19:54 +09001055 goto retry;
1056 }
1057
1058 /* fall through */
1059 pmp_fail:
1060 /* Control always ends up here after detaching PMP. Shut up
1061 * and return if we're unloading.
1062 */
1063 if (ap->pflags & ATA_PFLAG_UNLOADING)
1064 return rc;
1065
Tejun Heo071f44b2008-04-07 22:47:22 +09001066 if (!sata_pmp_attached(ap))
Tejun Heo3af9a772007-09-23 13:19:54 +09001067 goto retry;
1068
1069 if (--pmp_tries) {
Tejun Heocf480622008-01-24 00:05:14 +09001070 pmp_ehc->i.action |= ATA_EH_RESET;
Tejun Heo3af9a772007-09-23 13:19:54 +09001071 goto retry;
1072 }
1073
Joe Perchesa9a79df2011-04-15 15:51:59 -07001074 ata_port_err(ap, "failed to recover PMP after %d tries, giving up\n",
1075 ATA_EH_PMP_TRIES);
Tejun Heo3af9a772007-09-23 13:19:54 +09001076 sata_pmp_detach(pmp_dev);
1077 ata_dev_disable(pmp_dev);
1078
1079 return rc;
1080}
1081
1082/**
Tejun Heoa1efdab2008-03-25 12:22:50 +09001083 * sata_pmp_error_handler - do standard error handling for PMP-enabled host
Tejun Heo3af9a772007-09-23 13:19:54 +09001084 * @ap: host port to handle error for
Tejun Heo3af9a772007-09-23 13:19:54 +09001085 *
1086 * Perform standard error handling sequence for PMP-enabled host
1087 * @ap.
1088 *
1089 * LOCKING:
1090 * Kernel thread context (may sleep).
1091 */
Tejun Heoa1efdab2008-03-25 12:22:50 +09001092void sata_pmp_error_handler(struct ata_port *ap)
Tejun Heo3af9a772007-09-23 13:19:54 +09001093{
1094 ata_eh_autopsy(ap);
1095 ata_eh_report(ap);
Tejun Heoa1efdab2008-03-25 12:22:50 +09001096 sata_pmp_eh_recover(ap);
Tejun Heo3af9a772007-09-23 13:19:54 +09001097 ata_eh_finish(ap);
1098}
Tejun Heo48515f62008-04-07 22:47:21 +09001099
1100EXPORT_SYMBOL_GPL(sata_pmp_port_ops);
1101EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
1102EXPORT_SYMBOL_GPL(sata_pmp_error_handler);