?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
net: DCB: Validate DCB_ATTR_DCB_BUFFER argument
[linux/fpc-iii.git] / drivers / ata / libata-core.c
blob066b37963ad5f83ed844617e173e37d24ec968b0
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * libata-core.c - helper library for ATA
4 *
5 * Maintained by: Tejun Heo <tj@kernel.org>
6 * Please ALWAYS copy linux-ide@vger.kernel.org
7 * on emails.
8 *
9 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
10 * Copyright 2003-2004 Jeff Garzik
11 *
12 * libata documentation is available via 'make {ps|pdf}docs',
13 * as Documentation/driver-api/libata.rst
14 *
15 * Hardware documentation available from http://www.t13.org/ and
16 * http://www.sata-io.org/
17 *
18 * Standards documents from:
19 * http://www.t13.org (ATA standards, PCI DMA IDE spec)
20 * http://www.t10.org (SCSI MMC - for ATAPI MMC)
21 * http://www.sata-io.org (SATA)
22 * http://www.compactflash.org (CF)
23 * http://www.qic.org (QIC157 - Tape and DSC)
24 * http://www.ce-ata.org (CE-ATA: not supported)
25 */
26
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/pci.h>
30 #include <linux/init.h>
31 #include <linux/list.h>
32 #include <linux/mm.h>
33 #include <linux/spinlock.h>
34 #include <linux/blkdev.h>
35 #include <linux/delay.h>
36 #include <linux/timer.h>
37 #include <linux/time.h>
38 #include <linux/interrupt.h>
39 #include <linux/completion.h>
40 #include <linux/suspend.h>
41 #include <linux/workqueue.h>
42 #include <linux/scatterlist.h>
43 #include <linux/io.h>
44 #include <linux/log2.h>
45 #include <linux/slab.h>
46 #include <linux/glob.h>
47 #include <scsi/scsi.h>
48 #include <scsi/scsi_cmnd.h>
49 #include <scsi/scsi_host.h>
50 #include <linux/libata.h>
51 #include <asm/byteorder.h>
52 #include <asm/unaligned.h>
53 #include <linux/cdrom.h>
54 #include <linux/ratelimit.h>
55 #include <linux/leds.h>
56 #include <linux/pm_runtime.h>
57 #include <linux/platform_device.h>
58
59 #define CREATE_TRACE_POINTS
60 #include <trace/events/libata.h>
61
62 #include "libata.h"
63 #include "libata-transport.h"
64
65 /* debounce timing parameters in msecs { interval, duration, timeout } */
66 const unsigned long sata_deb_timing_normal[] = { 5, 100, 2000 };
67 const unsigned long sata_deb_timing_hotplug[] = { 25, 500, 2000 };
68 const unsigned long sata_deb_timing_long[] = { 100, 2000, 5000 };
69
70 const struct ata_port_operations ata_base_port_ops = {
71 .prereset = ata_std_prereset,
72 .postreset = ata_std_postreset,
73 .error_handler = ata_std_error_handler,
74 .sched_eh = ata_std_sched_eh,
75 .end_eh = ata_std_end_eh,
76 };
77
78 const struct ata_port_operations sata_port_ops = {
79 .inherits = &ata_base_port_ops,
80
81 .qc_defer = ata_std_qc_defer,
82 .hardreset = sata_std_hardreset,
83 };
84
85 static unsigned int ata_dev_init_params(struct ata_device *dev,
86 u16 heads, u16 sectors);
87 static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
88 static void ata_dev_xfermask(struct ata_device *dev);
89 static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
90
91 atomic_t ata_print_id = ATOMIC_INIT(0);
92
93 struct ata_force_param {
94 const char *name;
95 unsigned int cbl;
96 int spd_limit;
97 unsigned long xfer_mask;
98 unsigned int horkage_on;
99 unsigned int horkage_off;
100 unsigned int lflags;
101 };
102
103 struct ata_force_ent {
104 int port;
105 int device;
106 struct ata_force_param param;
107 };
108
109 static struct ata_force_ent *ata_force_tbl;
110 static int ata_force_tbl_size;
111
112 static char ata_force_param_buf[PAGE_SIZE] __initdata;
113 /* param_buf is thrown away after initialization, disallow read */
114 module_param_string(force, ata_force_param_buf, sizeof(ata_force_param_buf), 0);
115 MODULE_PARM_DESC(force, "Force ATA configurations including cable type, link speed and transfer mode (see Documentation/admin-guide/kernel-parameters.rst for details)");
116
117 static int atapi_enabled = 1;
118 module_param(atapi_enabled, int, 0444);
119 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on [default])");
120
121 static int atapi_dmadir = 0;
122 module_param(atapi_dmadir, int, 0444);
123 MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off [default], 1=on)");
124
125 int atapi_passthru16 = 1;
126 module_param(atapi_passthru16, int, 0444);
127 MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices (0=off, 1=on [default])");
128
129 int libata_fua = 0;
130 module_param_named(fua, libata_fua, int, 0444);
131 MODULE_PARM_DESC(fua, "FUA support (0=off [default], 1=on)");
132
133 static int ata_ignore_hpa;
134 module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644);
135 MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore limits, using full disk)");
136
137 static int libata_dma_mask = ATA_DMA_MASK_ATA|ATA_DMA_MASK_ATAPI|ATA_DMA_MASK_CFA;
138 module_param_named(dma, libata_dma_mask, int, 0444);
139 MODULE_PARM_DESC(dma, "DMA enable/disable (0x1==ATA, 0x2==ATAPI, 0x4==CF)");
140
141 static int ata_probe_timeout;
142 module_param(ata_probe_timeout, int, 0444);
143 MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
144
145 int libata_noacpi = 0;
146 module_param_named(noacpi, libata_noacpi, int, 0444);
147 MODULE_PARM_DESC(noacpi, "Disable the use of ACPI in probe/suspend/resume (0=off [default], 1=on)");
148
149 int libata_allow_tpm = 0;
150 module_param_named(allow_tpm, libata_allow_tpm, int, 0444);
151 MODULE_PARM_DESC(allow_tpm, "Permit the use of TPM commands (0=off [default], 1=on)");
152
153 static int atapi_an;
154 module_param(atapi_an, int, 0444);
155 MODULE_PARM_DESC(atapi_an, "Enable ATAPI AN media presence notification (0=0ff [default], 1=on)");
156
157 MODULE_AUTHOR("Jeff Garzik");
158 MODULE_DESCRIPTION("Library module for ATA devices");
159 MODULE_LICENSE("GPL");
160 MODULE_VERSION(DRV_VERSION);
161
162
163 static bool ata_sstatus_online(u32 sstatus)
164 {
165 return (sstatus & 0xf) == 0x3;
166 }
167
168 /**
169 * ata_link_next - link iteration helper
170 * @link: the previous link, NULL to start
171 * @ap: ATA port containing links to iterate
172 * @mode: iteration mode, one of ATA_LITER_*
173 *
174 * LOCKING:
175 * Host lock or EH context.
176 *
177 * RETURNS:
178 * Pointer to the next link.
179 */
180 struct ata_link *ata_link_next(struct ata_link *link, struct ata_port *ap,
181 enum ata_link_iter_mode mode)
182 {
183 BUG_ON(mode != ATA_LITER_EDGE &&
184 mode != ATA_LITER_PMP_FIRST && mode != ATA_LITER_HOST_FIRST);
185
186 /* NULL link indicates start of iteration */
187 if (!link)
188 switch (mode) {
189 case ATA_LITER_EDGE:
190 case ATA_LITER_PMP_FIRST:
191 if (sata_pmp_attached(ap))
192 return ap->pmp_link;
193 /* fall through */
194 case ATA_LITER_HOST_FIRST:
195 return &ap->link;
196 }
197
198 /* we just iterated over the host link, what's next? */
199 if (link == &ap->link)
200 switch (mode) {
201 case ATA_LITER_HOST_FIRST:
202 if (sata_pmp_attached(ap))
203 return ap->pmp_link;
204 /* fall through */
205 case ATA_LITER_PMP_FIRST:
206 if (unlikely(ap->slave_link))
207 return ap->slave_link;
208 /* fall through */
209 case ATA_LITER_EDGE:
210 return NULL;
211 }
212
213 /* slave_link excludes PMP */
214 if (unlikely(link == ap->slave_link))
215 return NULL;
216
217 /* we were over a PMP link */
218 if (++link < ap->pmp_link + ap->nr_pmp_links)
219 return link;
220
221 if (mode == ATA_LITER_PMP_FIRST)
222 return &ap->link;
223
224 return NULL;
225 }
226
227 /**
228 * ata_dev_next - device iteration helper
229 * @dev: the previous device, NULL to start
230 * @link: ATA link containing devices to iterate
231 * @mode: iteration mode, one of ATA_DITER_*
232 *
233 * LOCKING:
234 * Host lock or EH context.
235 *
236 * RETURNS:
237 * Pointer to the next device.
238 */
239 struct ata_device *ata_dev_next(struct ata_device *dev, struct ata_link *link,
240 enum ata_dev_iter_mode mode)
241 {
242 BUG_ON(mode != ATA_DITER_ENABLED && mode != ATA_DITER_ENABLED_REVERSE &&
243 mode != ATA_DITER_ALL && mode != ATA_DITER_ALL_REVERSE);
244
245 /* NULL dev indicates start of iteration */
246 if (!dev)
247 switch (mode) {
248 case ATA_DITER_ENABLED:
249 case ATA_DITER_ALL:
250 dev = link->device;
251 goto check;
252 case ATA_DITER_ENABLED_REVERSE:
253 case ATA_DITER_ALL_REVERSE:
254 dev = link->device + ata_link_max_devices(link) - 1;
255 goto check;
256 }
257
258 next:
259 /* move to the next one */
260 switch (mode) {
261 case ATA_DITER_ENABLED:
262 case ATA_DITER_ALL:
263 if (++dev < link->device + ata_link_max_devices(link))
264 goto check;
265 return NULL;
266 case ATA_DITER_ENABLED_REVERSE:
267 case ATA_DITER_ALL_REVERSE:
268 if (--dev >= link->device)
269 goto check;
270 return NULL;
271 }
272
273 check:
274 if ((mode == ATA_DITER_ENABLED || mode == ATA_DITER_ENABLED_REVERSE) &&
275 !ata_dev_enabled(dev))
276 goto next;
277 return dev;
278 }
279
280 /**
281 * ata_dev_phys_link - find physical link for a device
282 * @dev: ATA device to look up physical link for
283 *
284 * Look up physical link which @dev is attached to. Note that
285 * this is different from @dev->link only when @dev is on slave
286 * link. For all other cases, it's the same as @dev->link.
287 *
288 * LOCKING:
289 * Don't care.
290 *
291 * RETURNS:
292 * Pointer to the found physical link.
293 */
294 struct ata_link *ata_dev_phys_link(struct ata_device *dev)
295 {
296 struct ata_port *ap = dev->link->ap;
297
298 if (!ap->slave_link)
299 return dev->link;
300 if (!dev->devno)
301 return &ap->link;
302 return ap->slave_link;
303 }
304
305 /**
306 * ata_force_cbl - force cable type according to libata.force
307 * @ap: ATA port of interest
308 *
309 * Force cable type according to libata.force and whine about it.
310 * The last entry which has matching port number is used, so it
311 * can be specified as part of device force parameters. For
312 * example, both "a:40c,1.00:udma4" and "1.00:40c,udma4" have the
313 * same effect.
314 *
315 * LOCKING:
316 * EH context.
317 */
318 void ata_force_cbl(struct ata_port *ap)
319 {
320 int i;
321
322 for (i = ata_force_tbl_size - 1; i >= 0; i--) {
323 const struct ata_force_ent *fe = &ata_force_tbl[i];
324
325 if (fe->port != -1 && fe->port != ap->print_id)
326 continue;
327
328 if (fe->param.cbl == ATA_CBL_NONE)
329 continue;
330
331 ap->cbl = fe->param.cbl;
332 ata_port_notice(ap, "FORCE: cable set to %s\n", fe->param.name);
333 return;
334 }
335 }
336
337 /**
338 * ata_force_link_limits - force link limits according to libata.force
339 * @link: ATA link of interest
340 *
341 * Force link flags and SATA spd limit according to libata.force
342 * and whine about it. When only the port part is specified
343 * (e.g. 1:), the limit applies to all links connected to both
344 * the host link and all fan-out ports connected via PMP. If the
345 * device part is specified as 0 (e.g. 1.00:), it specifies the
346 * first fan-out link not the host link. Device number 15 always
347 * points to the host link whether PMP is attached or not. If the
348 * controller has slave link, device number 16 points to it.
349 *
350 * LOCKING:
351 * EH context.
352 */
353 static void ata_force_link_limits(struct ata_link *link)
354 {
355 bool did_spd = false;
356 int linkno = link->pmp;
357 int i;
358
359 if (ata_is_host_link(link))
360 linkno += 15;
361
362 for (i = ata_force_tbl_size - 1; i >= 0; i--) {
363 const struct ata_force_ent *fe = &ata_force_tbl[i];
364
365 if (fe->port != -1 && fe->port != link->ap->print_id)
366 continue;
367
368 if (fe->device != -1 && fe->device != linkno)
369 continue;
370
371 /* only honor the first spd limit */
372 if (!did_spd && fe->param.spd_limit) {
373 link->hw_sata_spd_limit = (1 << fe->param.spd_limit) - 1;
374 ata_link_notice(link, "FORCE: PHY spd limit set to %s\n",
375 fe->param.name);
376 did_spd = true;
377 }
378
379 /* let lflags stack */
380 if (fe->param.lflags) {
381 link->flags |= fe->param.lflags;
382 ata_link_notice(link,
383 "FORCE: link flag 0x%x forced -> 0x%x\n",
384 fe->param.lflags, link->flags);
385 }
386 }
387 }
388
389 /**
390 * ata_force_xfermask - force xfermask according to libata.force
391 * @dev: ATA device of interest
392 *
393 * Force xfer_mask according to libata.force and whine about it.
394 * For consistency with link selection, device number 15 selects
395 * the first device connected to the host link.
396 *
397 * LOCKING:
398 * EH context.
399 */
400 static void ata_force_xfermask(struct ata_device *dev)
401 {
402 int devno = dev->link->pmp + dev->devno;
403 int alt_devno = devno;
404 int i;
405
406 /* allow n.15/16 for devices attached to host port */
407 if (ata_is_host_link(dev->link))
408 alt_devno += 15;
409
410 for (i = ata_force_tbl_size - 1; i >= 0; i--) {
411 const struct ata_force_ent *fe = &ata_force_tbl[i];
412 unsigned long pio_mask, mwdma_mask, udma_mask;
413
414 if (fe->port != -1 && fe->port != dev->link->ap->print_id)
415 continue;
416
417 if (fe->device != -1 && fe->device != devno &&
418 fe->device != alt_devno)
419 continue;
420
421 if (!fe->param.xfer_mask)
422 continue;
423
424 ata_unpack_xfermask(fe->param.xfer_mask,
425 &pio_mask, &mwdma_mask, &udma_mask);
426 if (udma_mask)
427 dev->udma_mask = udma_mask;
428 else if (mwdma_mask) {
429 dev->udma_mask = 0;
430 dev->mwdma_mask = mwdma_mask;
431 } else {
432 dev->udma_mask = 0;
433 dev->mwdma_mask = 0;
434 dev->pio_mask = pio_mask;
435 }
436
437 ata_dev_notice(dev, "FORCE: xfer_mask set to %s\n",
438 fe->param.name);
439 return;
440 }
441 }
442
443 /**
444 * ata_force_horkage - force horkage according to libata.force
445 * @dev: ATA device of interest
446 *
447 * Force horkage according to libata.force and whine about it.
448 * For consistency with link selection, device number 15 selects
449 * the first device connected to the host link.
450 *
451 * LOCKING:
452 * EH context.
453 */
454 static void ata_force_horkage(struct ata_device *dev)
455 {
456 int devno = dev->link->pmp + dev->devno;
457 int alt_devno = devno;
458 int i;
459
460 /* allow n.15/16 for devices attached to host port */
461 if (ata_is_host_link(dev->link))
462 alt_devno += 15;
463
464 for (i = 0; i < ata_force_tbl_size; i++) {
465 const struct ata_force_ent *fe = &ata_force_tbl[i];
466
467 if (fe->port != -1 && fe->port != dev->link->ap->print_id)
468 continue;
469
470 if (fe->device != -1 && fe->device != devno &&
471 fe->device != alt_devno)
472 continue;
473
474 if (!(~dev->horkage & fe->param.horkage_on) &&
475 !(dev->horkage & fe->param.horkage_off))
476 continue;
477
478 dev->horkage |= fe->param.horkage_on;
479 dev->horkage &= ~fe->param.horkage_off;
480
481 ata_dev_notice(dev, "FORCE: horkage modified (%s)\n",
482 fe->param.name);
483 }
484 }
485
486 /**
487 * atapi_cmd_type - Determine ATAPI command type from SCSI opcode
488 * @opcode: SCSI opcode
489 *
490 * Determine ATAPI command type from @opcode.
491 *
492 * LOCKING:
493 * None.
494 *
495 * RETURNS:
496 * ATAPI_{READ|WRITE|READ_CD|PASS_THRU|MISC}
497 */
498 int atapi_cmd_type(u8 opcode)
499 {
500 switch (opcode) {
501 case GPCMD_READ_10:
502 case GPCMD_READ_12:
503 return ATAPI_READ;
504
505 case GPCMD_WRITE_10:
506 case GPCMD_WRITE_12:
507 case GPCMD_WRITE_AND_VERIFY_10:
508 return ATAPI_WRITE;
509
510 case GPCMD_READ_CD:
511 case GPCMD_READ_CD_MSF:
512 return ATAPI_READ_CD;
513
514 case ATA_16:
515 case ATA_12:
516 if (atapi_passthru16)
517 return ATAPI_PASS_THRU;
518 /* fall thru */
519 default:
520 return ATAPI_MISC;
521 }
522 }
523
524 /**
525 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
526 * @tf: Taskfile to convert
527 * @pmp: Port multiplier port
528 * @is_cmd: This FIS is for command
529 * @fis: Buffer into which data will output
530 *
531 * Converts a standard ATA taskfile to a Serial ATA
532 * FIS structure (Register - Host to Device).
533 *
534 * LOCKING:
535 * Inherited from caller.
536 */
537 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
538 {
539 fis[0] = 0x27; /* Register - Host to Device FIS */
540 fis[1] = pmp & 0xf; /* Port multiplier number*/
541 if (is_cmd)
542 fis[1] |= (1 << 7); /* bit 7 indicates Command FIS */
543
544 fis[2] = tf->command;
545 fis[3] = tf->feature;
546
547 fis[4] = tf->lbal;
548 fis[5] = tf->lbam;
549 fis[6] = tf->lbah;
550 fis[7] = tf->device;
551
552 fis[8] = tf->hob_lbal;
553 fis[9] = tf->hob_lbam;
554 fis[10] = tf->hob_lbah;
555 fis[11] = tf->hob_feature;
556
557 fis[12] = tf->nsect;
558 fis[13] = tf->hob_nsect;
559 fis[14] = 0;
560 fis[15] = tf->ctl;
561
562 fis[16] = tf->auxiliary & 0xff;
563 fis[17] = (tf->auxiliary >> 8) & 0xff;
564 fis[18] = (tf->auxiliary >> 16) & 0xff;
565 fis[19] = (tf->auxiliary >> 24) & 0xff;
566 }
567
568 /**
569 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile
570 * @fis: Buffer from which data will be input
571 * @tf: Taskfile to output
572 *
573 * Converts a serial ATA FIS structure to a standard ATA taskfile.
574 *
575 * LOCKING:
576 * Inherited from caller.
577 */
578
579 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
580 {
581 tf->command = fis[2]; /* status */
582 tf->feature = fis[3]; /* error */
583
584 tf->lbal = fis[4];
585 tf->lbam = fis[5];
586 tf->lbah = fis[6];
587 tf->device = fis[7];
588
589 tf->hob_lbal = fis[8];
590 tf->hob_lbam = fis[9];
591 tf->hob_lbah = fis[10];
592
593 tf->nsect = fis[12];
594 tf->hob_nsect = fis[13];
595 }
596
597 static const u8 ata_rw_cmds[] = {
598 /* pio multi */
599 ATA_CMD_READ_MULTI,
600 ATA_CMD_WRITE_MULTI,
601 ATA_CMD_READ_MULTI_EXT,
602 ATA_CMD_WRITE_MULTI_EXT,
603 0,
604 0,
605 0,
606 ATA_CMD_WRITE_MULTI_FUA_EXT,
607 /* pio */
608 ATA_CMD_PIO_READ,
609 ATA_CMD_PIO_WRITE,
610 ATA_CMD_PIO_READ_EXT,
611 ATA_CMD_PIO_WRITE_EXT,
612 0,
613 0,
614 0,
615 0,
616 /* dma */
617 ATA_CMD_READ,
618 ATA_CMD_WRITE,
619 ATA_CMD_READ_EXT,
620 ATA_CMD_WRITE_EXT,
621 0,
622 0,
623 0,
624 ATA_CMD_WRITE_FUA_EXT
625 };
626
627 /**
628 * ata_rwcmd_protocol - set taskfile r/w commands and protocol
629 * @tf: command to examine and configure
630 * @dev: device tf belongs to
631 *
632 * Examine the device configuration and tf->flags to calculate
633 * the proper read/write commands and protocol to use.
634 *
635 * LOCKING:
636 * caller.
637 */
638 static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
639 {
640 u8 cmd;
641
642 int index, fua, lba48, write;
643
644 fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
645 lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
646 write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
647
648 if (dev->flags & ATA_DFLAG_PIO) {
649 tf->protocol = ATA_PROT_PIO;
650 index = dev->multi_count ? 0 : 8;
651 } else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
652 /* Unable to use DMA due to host limitation */
653 tf->protocol = ATA_PROT_PIO;
654 index = dev->multi_count ? 0 : 8;
655 } else {
656 tf->protocol = ATA_PROT_DMA;
657 index = 16;
658 }
659
660 cmd = ata_rw_cmds[index + fua + lba48 + write];
661 if (cmd) {
662 tf->command = cmd;
663 return 0;
664 }
665 return -1;
666 }
667
668 /**
669 * ata_tf_read_block - Read block address from ATA taskfile
670 * @tf: ATA taskfile of interest
671 * @dev: ATA device @tf belongs to
672 *
673 * LOCKING:
674 * None.
675 *
676 * Read block address from @tf. This function can handle all
677 * three address formats - LBA, LBA48 and CHS. tf->protocol and
678 * flags select the address format to use.
679 *
680 * RETURNS:
681 * Block address read from @tf.
682 */
683 u64 ata_tf_read_block(const struct ata_taskfile *tf, struct ata_device *dev)
684 {
685 u64 block = 0;
686
687 if (tf->flags & ATA_TFLAG_LBA) {
688 if (tf->flags & ATA_TFLAG_LBA48) {
689 block |= (u64)tf->hob_lbah << 40;
690 block |= (u64)tf->hob_lbam << 32;
691 block |= (u64)tf->hob_lbal << 24;
692 } else
693 block |= (tf->device & 0xf) << 24;
694
695 block |= tf->lbah << 16;
696 block |= tf->lbam << 8;
697 block |= tf->lbal;
698 } else {
699 u32 cyl, head, sect;
700
701 cyl = tf->lbam | (tf->lbah << 8);
702 head = tf->device & 0xf;
703 sect = tf->lbal;
704
705 if (!sect) {
706 ata_dev_warn(dev,
707 "device reported invalid CHS sector 0\n");
708 return U64_MAX;
709 }
710
711 block = (cyl * dev->heads + head) * dev->sectors + sect - 1;
712 }
713
714 return block;
715 }
716
717 /**
718 * ata_build_rw_tf - Build ATA taskfile for given read/write request
719 * @tf: Target ATA taskfile
720 * @dev: ATA device @tf belongs to
721 * @block: Block address
722 * @n_block: Number of blocks
723 * @tf_flags: RW/FUA etc...
724 * @tag: tag
725 * @class: IO priority class
726 *
727 * LOCKING:
728 * None.
729 *
730 * Build ATA taskfile @tf for read/write request described by
731 * @block, @n_block, @tf_flags and @tag on @dev.
732 *
733 * RETURNS:
734 *
735 * 0 on success, -ERANGE if the request is too large for @dev,
736 * -EINVAL if the request is invalid.
737 */
738 int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
739 u64 block, u32 n_block, unsigned int tf_flags,
740 unsigned int tag, int class)
741 {
742 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
743 tf->flags |= tf_flags;
744
745 if (ata_ncq_enabled(dev) && !ata_tag_internal(tag)) {
746 /* yay, NCQ */
747 if (!lba_48_ok(block, n_block))
748 return -ERANGE;
749
750 tf->protocol = ATA_PROT_NCQ;
751 tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
752
753 if (tf->flags & ATA_TFLAG_WRITE)
754 tf->command = ATA_CMD_FPDMA_WRITE;
755 else
756 tf->command = ATA_CMD_FPDMA_READ;
757
758 tf->nsect = tag << 3;
759 tf->hob_feature = (n_block >> 8) & 0xff;
760 tf->feature = n_block & 0xff;
761
762 tf->hob_lbah = (block >> 40) & 0xff;
763 tf->hob_lbam = (block >> 32) & 0xff;
764 tf->hob_lbal = (block >> 24) & 0xff;
765 tf->lbah = (block >> 16) & 0xff;
766 tf->lbam = (block >> 8) & 0xff;
767 tf->lbal = block & 0xff;
768
769 tf->device = ATA_LBA;
770 if (tf->flags & ATA_TFLAG_FUA)
771 tf->device |= 1 << 7;
772
773 if (dev->flags & ATA_DFLAG_NCQ_PRIO) {
774 if (class == IOPRIO_CLASS_RT)
775 tf->hob_nsect |= ATA_PRIO_HIGH <<
776 ATA_SHIFT_PRIO;
777 }
778 } else if (dev->flags & ATA_DFLAG_LBA) {
779 tf->flags |= ATA_TFLAG_LBA;
780
781 if (lba_28_ok(block, n_block)) {
782 /* use LBA28 */
783 tf->device |= (block >> 24) & 0xf;
784 } else if (lba_48_ok(block, n_block)) {
785 if (!(dev->flags & ATA_DFLAG_LBA48))
786 return -ERANGE;
787
788 /* use LBA48 */
789 tf->flags |= ATA_TFLAG_LBA48;
790
791 tf->hob_nsect = (n_block >> 8) & 0xff;
792
793 tf->hob_lbah = (block >> 40) & 0xff;
794 tf->hob_lbam = (block >> 32) & 0xff;
795 tf->hob_lbal = (block >> 24) & 0xff;
796 } else
797 /* request too large even for LBA48 */
798 return -ERANGE;
799
800 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
801 return -EINVAL;
802
803 tf->nsect = n_block & 0xff;
804
805 tf->lbah = (block >> 16) & 0xff;
806 tf->lbam = (block >> 8) & 0xff;
807 tf->lbal = block & 0xff;
808
809 tf->device |= ATA_LBA;
810 } else {
811 /* CHS */
812 u32 sect, head, cyl, track;
813
814 /* The request -may- be too large for CHS addressing. */
815 if (!lba_28_ok(block, n_block))
816 return -ERANGE;
817
818 if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
819 return -EINVAL;
820
821 /* Convert LBA to CHS */
822 track = (u32)block / dev->sectors;
823 cyl = track / dev->heads;
824 head = track % dev->heads;
825 sect = (u32)block % dev->sectors + 1;
826
827 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
828 (u32)block, track, cyl, head, sect);
829
830 /* Check whether the converted CHS can fit.
831 Cylinder: 0-65535
832 Head: 0-15
833 Sector: 1-255*/
834 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
835 return -ERANGE;
836
837 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
838 tf->lbal = sect;
839 tf->lbam = cyl;
840 tf->lbah = cyl >> 8;
841 tf->device |= head;
842 }
843
844 return 0;
845 }
846
847 /**
848 * ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
849 * @pio_mask: pio_mask
850 * @mwdma_mask: mwdma_mask
851 * @udma_mask: udma_mask
852 *
853 * Pack @pio_mask, @mwdma_mask and @udma_mask into a single
854 * unsigned int xfer_mask.
855 *
856 * LOCKING:
857 * None.
858 *
859 * RETURNS:
860 * Packed xfer_mask.
861 */
862 unsigned long ata_pack_xfermask(unsigned long pio_mask,
863 unsigned long mwdma_mask,
864 unsigned long udma_mask)
865 {
866 return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
867 ((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
868 ((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
869 }
870
871 /**
872 * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
873 * @xfer_mask: xfer_mask to unpack
874 * @pio_mask: resulting pio_mask
875 * @mwdma_mask: resulting mwdma_mask
876 * @udma_mask: resulting udma_mask
877 *
878 * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
879 * Any NULL destination masks will be ignored.
880 */
881 void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
882 unsigned long *mwdma_mask, unsigned long *udma_mask)
883 {
884 if (pio_mask)
885 *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
886 if (mwdma_mask)
887 *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
888 if (udma_mask)
889 *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
890 }
891
892 static const struct ata_xfer_ent {
893 int shift, bits;
894 u8 base;
895 } ata_xfer_tbl[] = {
896 { ATA_SHIFT_PIO, ATA_NR_PIO_MODES, XFER_PIO_0 },
897 { ATA_SHIFT_MWDMA, ATA_NR_MWDMA_MODES, XFER_MW_DMA_0 },
898 { ATA_SHIFT_UDMA, ATA_NR_UDMA_MODES, XFER_UDMA_0 },
899 { -1, },
900 };
901
902 /**
903 * ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
904 * @xfer_mask: xfer_mask of interest
905 *
906 * Return matching XFER_* value for @xfer_mask. Only the highest
907 * bit of @xfer_mask is considered.
908 *
909 * LOCKING:
910 * None.
911 *
912 * RETURNS:
913 * Matching XFER_* value, 0xff if no match found.
914 */
915 u8 ata_xfer_mask2mode(unsigned long xfer_mask)
916 {
917 int highbit = fls(xfer_mask) - 1;
918 const struct ata_xfer_ent *ent;
919
920 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
921 if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
922 return ent->base + highbit - ent->shift;
923 return 0xff;
924 }
925
926 /**
927 * ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
928 * @xfer_mode: XFER_* of interest
929 *
930 * Return matching xfer_mask for @xfer_mode.
931 *
932 * LOCKING:
933 * None.
934 *
935 * RETURNS:
936 * Matching xfer_mask, 0 if no match found.
937 */
938 unsigned long ata_xfer_mode2mask(u8 xfer_mode)
939 {
940 const struct ata_xfer_ent *ent;
941
942 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
943 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
944 return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
945 & ~((1 << ent->shift) - 1);
946 return 0;
947 }
948
949 /**
950 * ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
951 * @xfer_mode: XFER_* of interest
952 *
953 * Return matching xfer_shift for @xfer_mode.
954 *
955 * LOCKING:
956 * None.
957 *
958 * RETURNS:
959 * Matching xfer_shift, -1 if no match found.
960 */
961 int ata_xfer_mode2shift(unsigned long xfer_mode)
962 {
963 const struct ata_xfer_ent *ent;
964
965 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
966 if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
967 return ent->shift;
968 return -1;
969 }
970
971 /**
972 * ata_mode_string - convert xfer_mask to string
973 * @xfer_mask: mask of bits supported; only highest bit counts.
974 *
975 * Determine string which represents the highest speed
976 * (highest bit in @modemask).
977 *
978 * LOCKING:
979 * None.
980 *
981 * RETURNS:
982 * Constant C string representing highest speed listed in
983 * @mode_mask, or the constant C string "<n/a>".
984 */
985 const char *ata_mode_string(unsigned long xfer_mask)
986 {
987 static const char * const xfer_mode_str[] = {
988 "PIO0",
989 "PIO1",
990 "PIO2",
991 "PIO3",
992 "PIO4",
993 "PIO5",
994 "PIO6",
995 "MWDMA0",
996 "MWDMA1",
997 "MWDMA2",
998 "MWDMA3",
999 "MWDMA4",
1000 "UDMA/16",
1001 "UDMA/25",
1002 "UDMA/33",
1003 "UDMA/44",
1004 "UDMA/66",
1005 "UDMA/100",
1006 "UDMA/133",
1007 "UDMA7",
1008 };
1009 int highbit;
1010
1011 highbit = fls(xfer_mask) - 1;
1012 if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
1013 return xfer_mode_str[highbit];
1014 return "<n/a>";
1015 }
1016
1017 const char *sata_spd_string(unsigned int spd)
1018 {
1019 static const char * const spd_str[] = {
1020 "1.5 Gbps",
1021 "3.0 Gbps",
1022 "6.0 Gbps",
1023 };
1024
1025 if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
1026 return "<unknown>";
1027 return spd_str[spd - 1];
1028 }
1029
1030 /**
1031 * ata_dev_classify - determine device type based on ATA-spec signature
1032 * @tf: ATA taskfile register set for device to be identified
1033 *
1034 * Determine from taskfile register contents whether a device is
1035 * ATA or ATAPI, as per "Signature and persistence" section
1036 * of ATA/PI spec (volume 1, sect 5.14).
1037 *
1038 * LOCKING:
1039 * None.
1040 *
1041 * RETURNS:
1042 * Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP,
1043 * %ATA_DEV_ZAC, or %ATA_DEV_UNKNOWN the event of failure.
1044 */
1045 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
1046 {
1047 /* Apple's open source Darwin code hints that some devices only
1048 * put a proper signature into the LBA mid/high registers,
1049 * So, we only check those. It's sufficient for uniqueness.
1050 *
1051 * ATA/ATAPI-7 (d1532v1r1: Feb. 19, 2003) specified separate
1052 * signatures for ATA and ATAPI devices attached on SerialATA,
1053 * 0x3c/0xc3 and 0x69/0x96 respectively. However, SerialATA
1054 * spec has never mentioned about using different signatures
1055 * for ATA/ATAPI devices. Then, Serial ATA II: Port
1056 * Multiplier specification began to use 0x69/0x96 to identify
1057 * port multpliers and 0x3c/0xc3 to identify SEMB device.
1058 * ATA/ATAPI-7 dropped descriptions about 0x3c/0xc3 and
1059 * 0x69/0x96 shortly and described them as reserved for
1060 * SerialATA.
1061 *
1062 * We follow the current spec and consider that 0x69/0x96
1063 * identifies a port multiplier and 0x3c/0xc3 a SEMB device.
1064 * Unfortunately, WDC WD1600JS-62MHB5 (a hard drive) reports
1065 * SEMB signature. This is worked around in
1066 * ata_dev_read_id().
1067 */
1068 if ((tf->lbam == 0) && (tf->lbah == 0)) {
1069 DPRINTK("found ATA device by sig\n");
1070 return ATA_DEV_ATA;
1071 }
1072
1073 if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
1074 DPRINTK("found ATAPI device by sig\n");
1075 return ATA_DEV_ATAPI;
1076 }
1077
1078 if ((tf->lbam == 0x69) && (tf->lbah == 0x96)) {
1079 DPRINTK("found PMP device by sig\n");
1080 return ATA_DEV_PMP;
1081 }
1082
1083 if ((tf->lbam == 0x3c) && (tf->lbah == 0xc3)) {
1084 DPRINTK("found SEMB device by sig (could be ATA device)\n");
1085 return ATA_DEV_SEMB;
1086 }
1087
1088 if ((tf->lbam == 0xcd) && (tf->lbah == 0xab)) {
1089 DPRINTK("found ZAC device by sig\n");
1090 return ATA_DEV_ZAC;
1091 }
1092
1093 DPRINTK("unknown device\n");
1094 return ATA_DEV_UNKNOWN;
1095 }
1096
1097 /**
1098 * ata_id_string - Convert IDENTIFY DEVICE page into string
1099 * @id: IDENTIFY DEVICE results we will examine
1100 * @s: string into which data is output
1101 * @ofs: offset into identify device page
1102 * @len: length of string to return. must be an even number.
1103 *
1104 * The strings in the IDENTIFY DEVICE page are broken up into
1105 * 16-bit chunks. Run through the string, and output each
1106 * 8-bit chunk linearly, regardless of platform.
1107 *
1108 * LOCKING:
1109 * caller.
1110 */
1111
1112 void ata_id_string(const u16 *id, unsigned char *s,
1113 unsigned int ofs, unsigned int len)
1114 {
1115 unsigned int c;
1116
1117 BUG_ON(len & 1);
1118
1119 while (len > 0) {
1120 c = id[ofs] >> 8;
1121 *s = c;
1122 s++;
1123
1124 c = id[ofs] & 0xff;
1125 *s = c;
1126 s++;
1127
1128 ofs++;
1129 len -= 2;
1130 }
1131 }
1132
1133 /**
1134 * ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1135 * @id: IDENTIFY DEVICE results we will examine
1136 * @s: string into which data is output
1137 * @ofs: offset into identify device page
1138 * @len: length of string to return. must be an odd number.
1139 *
1140 * This function is identical to ata_id_string except that it
1141 * trims trailing spaces and terminates the resulting string with
1142 * null. @len must be actual maximum length (even number) + 1.
1143 *
1144 * LOCKING:
1145 * caller.
1146 */
1147 void ata_id_c_string(const u16 *id, unsigned char *s,
1148 unsigned int ofs, unsigned int len)
1149 {
1150 unsigned char *p;
1151
1152 ata_id_string(id, s, ofs, len - 1);
1153
1154 p = s + strnlen(s, len - 1);
1155 while (p > s && p[-1] == ' ')
1156 p--;
1157 *p = '\0';
1158 }
1159
1160 static u64 ata_id_n_sectors(const u16 *id)
1161 {
1162 if (ata_id_has_lba(id)) {
1163 if (ata_id_has_lba48(id))
1164 return ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
1165 else
1166 return ata_id_u32(id, ATA_ID_LBA_CAPACITY);
1167 } else {
1168 if (ata_id_current_chs_valid(id))
1169 return id[ATA_ID_CUR_CYLS] * id[ATA_ID_CUR_HEADS] *
1170 id[ATA_ID_CUR_SECTORS];
1171 else
1172 return id[ATA_ID_CYLS] * id[ATA_ID_HEADS] *
1173 id[ATA_ID_SECTORS];
1174 }
1175 }
1176
1177 u64 ata_tf_to_lba48(const struct ata_taskfile *tf)
1178 {
1179 u64 sectors = 0;
1180
1181 sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
1182 sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
1183 sectors |= ((u64)(tf->hob_lbal & 0xff)) << 24;
1184 sectors |= (tf->lbah & 0xff) << 16;
1185 sectors |= (tf->lbam & 0xff) << 8;
1186 sectors |= (tf->lbal & 0xff);
1187
1188 return sectors;
1189 }
1190
1191 u64 ata_tf_to_lba(const struct ata_taskfile *tf)
1192 {
1193 u64 sectors = 0;
1194
1195 sectors |= (tf->device & 0x0f) << 24;
1196 sectors |= (tf->lbah & 0xff) << 16;
1197 sectors |= (tf->lbam & 0xff) << 8;
1198 sectors |= (tf->lbal & 0xff);
1199
1200 return sectors;
1201 }
1202
1203 /**
1204 * ata_read_native_max_address - Read native max address
1205 * @dev: target device
1206 * @max_sectors: out parameter for the result native max address
1207 *
1208 * Perform an LBA48 or LBA28 native size query upon the device in
1209 * question.
1210 *
1211 * RETURNS:
1212 * 0 on success, -EACCES if command is aborted by the drive.
1213 * -EIO on other errors.
1214 */
1215 static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
1216 {
1217 unsigned int err_mask;
1218 struct ata_taskfile tf;
1219 int lba48 = ata_id_has_lba48(dev->id);
1220
1221 ata_tf_init(dev, &tf);
1222
1223 /* always clear all address registers */
1224 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1225
1226 if (lba48) {
1227 tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
1228 tf.flags |= ATA_TFLAG_LBA48;
1229 } else
1230 tf.command = ATA_CMD_READ_NATIVE_MAX;
1231
1232 tf.protocol = ATA_PROT_NODATA;
1233 tf.device |= ATA_LBA;
1234
1235 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1236 if (err_mask) {
1237 ata_dev_warn(dev,
1238 "failed to read native max address (err_mask=0x%x)\n",
1239 err_mask);
1240 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
1241 return -EACCES;
1242 return -EIO;
1243 }
1244
1245 if (lba48)
1246 *max_sectors = ata_tf_to_lba48(&tf) + 1;
1247 else
1248 *max_sectors = ata_tf_to_lba(&tf) + 1;
1249 if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1250 (*max_sectors)--;
1251 return 0;
1252 }
1253
1254 /**
1255 * ata_set_max_sectors - Set max sectors
1256 * @dev: target device
1257 * @new_sectors: new max sectors value to set for the device
1258 *
1259 * Set max sectors of @dev to @new_sectors.
1260 *
1261 * RETURNS:
1262 * 0 on success, -EACCES if command is aborted or denied (due to
1263 * previous non-volatile SET_MAX) by the drive. -EIO on other
1264 * errors.
1265 */
1266 static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
1267 {
1268 unsigned int err_mask;
1269 struct ata_taskfile tf;
1270 int lba48 = ata_id_has_lba48(dev->id);
1271
1272 new_sectors--;
1273
1274 ata_tf_init(dev, &tf);
1275
1276 tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1277
1278 if (lba48) {
1279 tf.command = ATA_CMD_SET_MAX_EXT;
1280 tf.flags |= ATA_TFLAG_LBA48;
1281
1282 tf.hob_lbal = (new_sectors >> 24) & 0xff;
1283 tf.hob_lbam = (new_sectors >> 32) & 0xff;
1284 tf.hob_lbah = (new_sectors >> 40) & 0xff;
1285 } else {
1286 tf.command = ATA_CMD_SET_MAX;
1287
1288 tf.device |= (new_sectors >> 24) & 0xf;
1289 }
1290
1291 tf.protocol = ATA_PROT_NODATA;
1292 tf.device |= ATA_LBA;
1293
1294 tf.lbal = (new_sectors >> 0) & 0xff;
1295 tf.lbam = (new_sectors >> 8) & 0xff;
1296 tf.lbah = (new_sectors >> 16) & 0xff;
1297
1298 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1299 if (err_mask) {
1300 ata_dev_warn(dev,
1301 "failed to set max address (err_mask=0x%x)\n",
1302 err_mask);
1303 if (err_mask == AC_ERR_DEV &&
1304 (tf.feature & (ATA_ABORTED | ATA_IDNF)))
1305 return -EACCES;
1306 return -EIO;
1307 }
1308
1309 return 0;
1310 }
1311
1312 /**
1313 * ata_hpa_resize - Resize a device with an HPA set
1314 * @dev: Device to resize
1315 *
1316 * Read the size of an LBA28 or LBA48 disk with HPA features and resize
1317 * it if required to the full size of the media. The caller must check
1318 * the drive has the HPA feature set enabled.
1319 *
1320 * RETURNS:
1321 * 0 on success, -errno on failure.
1322 */
1323 static int ata_hpa_resize(struct ata_device *dev)
1324 {
1325 struct ata_eh_context *ehc = &dev->link->eh_context;
1326 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
1327 bool unlock_hpa = ata_ignore_hpa || dev->flags & ATA_DFLAG_UNLOCK_HPA;
1328 u64 sectors = ata_id_n_sectors(dev->id);
1329 u64 native_sectors;
1330 int rc;
1331
1332 /* do we need to do it? */
1333 if ((dev->class != ATA_DEV_ATA && dev->class != ATA_DEV_ZAC) ||
1334 !ata_id_has_lba(dev->id) || !ata_id_hpa_enabled(dev->id) ||
1335 (dev->horkage & ATA_HORKAGE_BROKEN_HPA))
1336 return 0;
1337
1338 /* read native max address */
1339 rc = ata_read_native_max_address(dev, &native_sectors);
1340 if (rc) {
1341 /* If device aborted the command or HPA isn't going to
1342 * be unlocked, skip HPA resizing.
1343 */
1344 if (rc == -EACCES || !unlock_hpa) {
1345 ata_dev_warn(dev,
1346 "HPA support seems broken, skipping HPA handling\n");
1347 dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1348
1349 /* we can continue if device aborted the command */
1350 if (rc == -EACCES)
1351 rc = 0;
1352 }
1353
1354 return rc;
1355 }
1356 dev->n_native_sectors = native_sectors;
1357
1358 /* nothing to do? */
1359 if (native_sectors <= sectors || !unlock_hpa) {
1360 if (!print_info || native_sectors == sectors)
1361 return 0;
1362
1363 if (native_sectors > sectors)
1364 ata_dev_info(dev,
1365 "HPA detected: current %llu, native %llu\n",
1366 (unsigned long long)sectors,
1367 (unsigned long long)native_sectors);
1368 else if (native_sectors < sectors)
1369 ata_dev_warn(dev,
1370 "native sectors (%llu) is smaller than sectors (%llu)\n",
1371 (unsigned long long)native_sectors,
1372 (unsigned long long)sectors);
1373 return 0;
1374 }
1375
1376 /* let's unlock HPA */
1377 rc = ata_set_max_sectors(dev, native_sectors);
1378 if (rc == -EACCES) {
1379 /* if device aborted the command, skip HPA resizing */
1380 ata_dev_warn(dev,
1381 "device aborted resize (%llu -> %llu), skipping HPA handling\n",
1382 (unsigned long long)sectors,
1383 (unsigned long long)native_sectors);
1384 dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1385 return 0;
1386 } else if (rc)
1387 return rc;
1388
1389 /* re-read IDENTIFY data */
1390 rc = ata_dev_reread_id(dev, 0);
1391 if (rc) {
1392 ata_dev_err(dev,
1393 "failed to re-read IDENTIFY data after HPA resizing\n");
1394 return rc;
1395 }
1396
1397 if (print_info) {
1398 u64 new_sectors = ata_id_n_sectors(dev->id);
1399 ata_dev_info(dev,
1400 "HPA unlocked: %llu -> %llu, native %llu\n",
1401 (unsigned long long)sectors,
1402 (unsigned long long)new_sectors,
1403 (unsigned long long)native_sectors);
1404 }
1405
1406 return 0;
1407 }
1408
1409 /**
1410 * ata_dump_id - IDENTIFY DEVICE info debugging output
1411 * @id: IDENTIFY DEVICE page to dump
1412 *
1413 * Dump selected 16-bit words from the given IDENTIFY DEVICE
1414 * page.
1415 *
1416 * LOCKING:
1417 * caller.
1418 */
1419
1420 static inline void ata_dump_id(const u16 *id)
1421 {
1422 DPRINTK("49==0x%04x "
1423 "53==0x%04x "
1424 "63==0x%04x "
1425 "64==0x%04x "
1426 "75==0x%04x \n",
1427 id[49],
1428 id[53],
1429 id[63],
1430 id[64],
1431 id[75]);
1432 DPRINTK("80==0x%04x "
1433 "81==0x%04x "
1434 "82==0x%04x "
1435 "83==0x%04x "
1436 "84==0x%04x \n",
1437 id[80],
1438 id[81],
1439 id[82],
1440 id[83],
1441 id[84]);
1442 DPRINTK("88==0x%04x "
1443 "93==0x%04x\n",
1444 id[88],
1445 id[93]);
1446 }
1447
1448 /**
1449 * ata_id_xfermask - Compute xfermask from the given IDENTIFY data
1450 * @id: IDENTIFY data to compute xfer mask from
1451 *
1452 * Compute the xfermask for this device. This is not as trivial
1453 * as it seems if we must consider early devices correctly.
1454 *
1455 * FIXME: pre IDE drive timing (do we care ?).
1456 *
1457 * LOCKING:
1458 * None.
1459 *
1460 * RETURNS:
1461 * Computed xfermask
1462 */
1463 unsigned long ata_id_xfermask(const u16 *id)
1464 {
1465 unsigned long pio_mask, mwdma_mask, udma_mask;
1466
1467 /* Usual case. Word 53 indicates word 64 is valid */
1468 if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
1469 pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
1470 pio_mask <<= 3;
1471 pio_mask |= 0x7;
1472 } else {
1473 /* If word 64 isn't valid then Word 51 high byte holds
1474 * the PIO timing number for the maximum. Turn it into
1475 * a mask.
1476 */
1477 u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1478 if (mode < 5) /* Valid PIO range */
1479 pio_mask = (2 << mode) - 1;
1480 else
1481 pio_mask = 1;
1482
1483 /* But wait.. there's more. Design your standards by
1484 * committee and you too can get a free iordy field to
1485 * process. However its the speeds not the modes that
1486 * are supported... Note drivers using the timing API
1487 * will get this right anyway
1488 */
1489 }
1490
1491 mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1492
1493 if (ata_id_is_cfa(id)) {
1494 /*
1495 * Process compact flash extended modes
1496 */
1497 int pio = (id[ATA_ID_CFA_MODES] >> 0) & 0x7;
1498 int dma = (id[ATA_ID_CFA_MODES] >> 3) & 0x7;
1499
1500 if (pio)
1501 pio_mask |= (1 << 5);
1502 if (pio > 1)
1503 pio_mask |= (1 << 6);
1504 if (dma)
1505 mwdma_mask |= (1 << 3);
1506 if (dma > 1)
1507 mwdma_mask |= (1 << 4);
1508 }
1509
1510 udma_mask = 0;
1511 if (id[ATA_ID_FIELD_VALID] & (1 << 2))
1512 udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1513
1514 return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
1515 }
1516
1517 static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1518 {
1519 struct completion *waiting = qc->private_data;
1520
1521 complete(waiting);
1522 }
1523
1524 /**
1525 * ata_exec_internal_sg - execute libata internal command
1526 * @dev: Device to which the command is sent
1527 * @tf: Taskfile registers for the command and the result
1528 * @cdb: CDB for packet command
1529 * @dma_dir: Data transfer direction of the command
1530 * @sgl: sg list for the data buffer of the command
1531 * @n_elem: Number of sg entries
1532 * @timeout: Timeout in msecs (0 for default)
1533 *
1534 * Executes libata internal command with timeout. @tf contains
1535 * command on entry and result on return. Timeout and error
1536 * conditions are reported via return value. No recovery action
1537 * is taken after a command times out. It's caller's duty to
1538 * clean up after timeout.
1539 *
1540 * LOCKING:
1541 * None. Should be called with kernel context, might sleep.
1542 *
1543 * RETURNS:
1544 * Zero on success, AC_ERR_* mask on failure
1545 */
1546 unsigned ata_exec_internal_sg(struct ata_device *dev,
1547 struct ata_taskfile *tf, const u8 *cdb,
1548 int dma_dir, struct scatterlist *sgl,
1549 unsigned int n_elem, unsigned long timeout)
1550 {
1551 struct ata_link *link = dev->link;
1552 struct ata_port *ap = link->ap;
1553 u8 command = tf->command;
1554 int auto_timeout = 0;
1555 struct ata_queued_cmd *qc;
1556 unsigned int preempted_tag;
1557 u32 preempted_sactive;
1558 u64 preempted_qc_active;
1559 int preempted_nr_active_links;
1560 DECLARE_COMPLETION_ONSTACK(wait);
1561 unsigned long flags;
1562 unsigned int err_mask;
1563 int rc;
1564
1565 spin_lock_irqsave(ap->lock, flags);
1566
1567 /* no internal command while frozen */
1568 if (ap->pflags & ATA_PFLAG_FROZEN) {
1569 spin_unlock_irqrestore(ap->lock, flags);
1570 return AC_ERR_SYSTEM;
1571 }
1572
1573 /* initialize internal qc */
1574 qc = __ata_qc_from_tag(ap, ATA_TAG_INTERNAL);
1575
1576 qc->tag = ATA_TAG_INTERNAL;
1577 qc->hw_tag = 0;
1578 qc->scsicmd = NULL;
1579 qc->ap = ap;
1580 qc->dev = dev;
1581 ata_qc_reinit(qc);
1582
1583 preempted_tag = link->active_tag;
1584 preempted_sactive = link->sactive;
1585 preempted_qc_active = ap->qc_active;
1586 preempted_nr_active_links = ap->nr_active_links;
1587 link->active_tag = ATA_TAG_POISON;
1588 link->sactive = 0;
1589 ap->qc_active = 0;
1590 ap->nr_active_links = 0;
1591
1592 /* prepare & issue qc */
1593 qc->tf = *tf;
1594 if (cdb)
1595 memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1596
1597 /* some SATA bridges need us to indicate data xfer direction */
1598 if (tf->protocol == ATAPI_PROT_DMA && (dev->flags & ATA_DFLAG_DMADIR) &&
1599 dma_dir == DMA_FROM_DEVICE)
1600 qc->tf.feature |= ATAPI_DMADIR;
1601
1602 qc->flags |= ATA_QCFLAG_RESULT_TF;
1603 qc->dma_dir = dma_dir;
1604 if (dma_dir != DMA_NONE) {
1605 unsigned int i, buflen = 0;
1606 struct scatterlist *sg;
1607
1608 for_each_sg(sgl, sg, n_elem, i)
1609 buflen += sg->length;
1610
1611 ata_sg_init(qc, sgl, n_elem);
1612 qc->nbytes = buflen;
1613 }
1614
1615 qc->private_data = &wait;
1616 qc->complete_fn = ata_qc_complete_internal;
1617
1618 ata_qc_issue(qc);
1619
1620 spin_unlock_irqrestore(ap->lock, flags);
1621
1622 if (!timeout) {
1623 if (ata_probe_timeout)
1624 timeout = ata_probe_timeout * 1000;
1625 else {
1626 timeout = ata_internal_cmd_timeout(dev, command);
1627 auto_timeout = 1;
1628 }
1629 }
1630
1631 if (ap->ops->error_handler)
1632 ata_eh_release(ap);
1633
1634 rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1635
1636 if (ap->ops->error_handler)
1637 ata_eh_acquire(ap);
1638
1639 ata_sff_flush_pio_task(ap);
1640
1641 if (!rc) {
1642 spin_lock_irqsave(ap->lock, flags);
1643
1644 /* We're racing with irq here. If we lose, the
1645 * following test prevents us from completing the qc
1646 * twice. If we win, the port is frozen and will be
1647 * cleaned up by ->post_internal_cmd().
1648 */
1649 if (qc->flags & ATA_QCFLAG_ACTIVE) {
1650 qc->err_mask |= AC_ERR_TIMEOUT;
1651
1652 if (ap->ops->error_handler)
1653 ata_port_freeze(ap);
1654 else
1655 ata_qc_complete(qc);
1656
1657 if (ata_msg_warn(ap))
1658 ata_dev_warn(dev, "qc timeout (cmd 0x%x)\n",
1659 command);
1660 }
1661
1662 spin_unlock_irqrestore(ap->lock, flags);
1663 }
1664
1665 /* do post_internal_cmd */
1666 if (ap->ops->post_internal_cmd)
1667 ap->ops->post_internal_cmd(qc);
1668
1669 /* perform minimal error analysis */
1670 if (qc->flags & ATA_QCFLAG_FAILED) {
1671 if (qc->result_tf.command & (ATA_ERR | ATA_DF))
1672 qc->err_mask |= AC_ERR_DEV;
1673
1674 if (!qc->err_mask)
1675 qc->err_mask |= AC_ERR_OTHER;
1676
1677 if (qc->err_mask & ~AC_ERR_OTHER)
1678 qc->err_mask &= ~AC_ERR_OTHER;
1679 } else if (qc->tf.command == ATA_CMD_REQ_SENSE_DATA) {
1680 qc->result_tf.command |= ATA_SENSE;
1681 }
1682
1683 /* finish up */
1684 spin_lock_irqsave(ap->lock, flags);
1685
1686 *tf = qc->result_tf;
1687 err_mask = qc->err_mask;
1688
1689 ata_qc_free(qc);
1690 link->active_tag = preempted_tag;
1691 link->sactive = preempted_sactive;
1692 ap->qc_active = preempted_qc_active;
1693 ap->nr_active_links = preempted_nr_active_links;
1694
1695 spin_unlock_irqrestore(ap->lock, flags);
1696
1697 if ((err_mask & AC_ERR_TIMEOUT) && auto_timeout)
1698 ata_internal_cmd_timed_out(dev, command);
1699
1700 return err_mask;
1701 }
1702
1703 /**
1704 * ata_exec_internal - execute libata internal command
1705 * @dev: Device to which the command is sent
1706 * @tf: Taskfile registers for the command and the result
1707 * @cdb: CDB for packet command
1708 * @dma_dir: Data transfer direction of the command
1709 * @buf: Data buffer of the command
1710 * @buflen: Length of data buffer
1711 * @timeout: Timeout in msecs (0 for default)
1712 *
1713 * Wrapper around ata_exec_internal_sg() which takes simple
1714 * buffer instead of sg list.
1715 *
1716 * LOCKING:
1717 * None. Should be called with kernel context, might sleep.
1718 *
1719 * RETURNS:
1720 * Zero on success, AC_ERR_* mask on failure
1721 */
1722 unsigned ata_exec_internal(struct ata_device *dev,
1723 struct ata_taskfile *tf, const u8 *cdb,
1724 int dma_dir, void *buf, unsigned int buflen,
1725 unsigned long timeout)
1726 {
1727 struct scatterlist *psg = NULL, sg;
1728 unsigned int n_elem = 0;
1729
1730 if (dma_dir != DMA_NONE) {
1731 WARN_ON(!buf);
1732 sg_init_one(&sg, buf, buflen);
1733 psg = &sg;
1734 n_elem++;
1735 }
1736
1737 return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
1738 timeout);
1739 }
1740
1741 /**
1742 * ata_pio_need_iordy - check if iordy needed
1743 * @adev: ATA device
1744 *
1745 * Check if the current speed of the device requires IORDY. Used
1746 * by various controllers for chip configuration.
1747 */
1748 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1749 {
1750 /* Don't set IORDY if we're preparing for reset. IORDY may
1751 * lead to controller lock up on certain controllers if the
1752 * port is not occupied. See bko#11703 for details.
1753 */
1754 if (adev->link->ap->pflags & ATA_PFLAG_RESETTING)
1755 return 0;
1756 /* Controller doesn't support IORDY. Probably a pointless
1757 * check as the caller should know this.
1758 */
1759 if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1760 return 0;
1761 /* CF spec. r4.1 Table 22 says no iordy on PIO5 and PIO6. */
1762 if (ata_id_is_cfa(adev->id)
1763 && (adev->pio_mode == XFER_PIO_5 || adev->pio_mode == XFER_PIO_6))
1764 return 0;
1765 /* PIO3 and higher it is mandatory */
1766 if (adev->pio_mode > XFER_PIO_2)
1767 return 1;
1768 /* We turn it on when possible */
1769 if (ata_id_has_iordy(adev->id))
1770 return 1;
1771 return 0;
1772 }
1773
1774 /**
1775 * ata_pio_mask_no_iordy - Return the non IORDY mask
1776 * @adev: ATA device
1777 *
1778 * Compute the highest mode possible if we are not using iordy. Return
1779 * -1 if no iordy mode is available.
1780 */
1781 static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
1782 {
1783 /* If we have no drive specific rule, then PIO 2 is non IORDY */
1784 if (adev->id[ATA_ID_FIELD_VALID] & 2) { /* EIDE */
1785 u16 pio = adev->id[ATA_ID_EIDE_PIO];
1786 /* Is the speed faster than the drive allows non IORDY ? */
1787 if (pio) {
1788 /* This is cycle times not frequency - watch the logic! */
1789 if (pio > 240) /* PIO2 is 240nS per cycle */
1790 return 3 << ATA_SHIFT_PIO;
1791 return 7 << ATA_SHIFT_PIO;
1792 }
1793 }
1794 return 3 << ATA_SHIFT_PIO;
1795 }
1796
1797 /**
1798 * ata_do_dev_read_id - default ID read method
1799 * @dev: device
1800 * @tf: proposed taskfile
1801 * @id: data buffer
1802 *
1803 * Issue the identify taskfile and hand back the buffer containing
1804 * identify data. For some RAID controllers and for pre ATA devices
1805 * this function is wrapped or replaced by the driver
1806 */
1807 unsigned int ata_do_dev_read_id(struct ata_device *dev,
1808 struct ata_taskfile *tf, u16 *id)
1809 {
1810 return ata_exec_internal(dev, tf, NULL, DMA_FROM_DEVICE,
1811 id, sizeof(id[0]) * ATA_ID_WORDS, 0);
1812 }
1813
1814 /**
1815 * ata_dev_read_id - Read ID data from the specified device
1816 * @dev: target device
1817 * @p_class: pointer to class of the target device (may be changed)
1818 * @flags: ATA_READID_* flags
1819 * @id: buffer to read IDENTIFY data into
1820 *
1821 * Read ID data from the specified device. ATA_CMD_ID_ATA is
1822 * performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1823 * devices. This function also issues ATA_CMD_INIT_DEV_PARAMS
1824 * for pre-ATA4 drives.
1825 *
1826 * FIXME: ATA_CMD_ID_ATA is optional for early drives and right
1827 * now we abort if we hit that case.
1828 *
1829 * LOCKING:
1830 * Kernel thread context (may sleep)
1831 *
1832 * RETURNS:
1833 * 0 on success, -errno otherwise.
1834 */
1835 int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1836 unsigned int flags, u16 *id)
1837 {
1838 struct ata_port *ap = dev->link->ap;
1839 unsigned int class = *p_class;
1840 struct ata_taskfile tf;
1841 unsigned int err_mask = 0;
1842 const char *reason;
1843 bool is_semb = class == ATA_DEV_SEMB;
1844 int may_fallback = 1, tried_spinup = 0;
1845 int rc;
1846
1847 if (ata_msg_ctl(ap))
1848 ata_dev_dbg(dev, "%s: ENTER\n", __func__);
1849
1850 retry:
1851 ata_tf_init(dev, &tf);
1852
1853 switch (class) {
1854 case ATA_DEV_SEMB:
1855 class = ATA_DEV_ATA; /* some hard drives report SEMB sig */
1856 /* fall through */
1857 case ATA_DEV_ATA:
1858 case ATA_DEV_ZAC:
1859 tf.command = ATA_CMD_ID_ATA;
1860 break;
1861 case ATA_DEV_ATAPI:
1862 tf.command = ATA_CMD_ID_ATAPI;
1863 break;
1864 default:
1865 rc = -ENODEV;
1866 reason = "unsupported class";
1867 goto err_out;
1868 }
1869
1870 tf.protocol = ATA_PROT_PIO;
1871
1872 /* Some devices choke if TF registers contain garbage. Make
1873 * sure those are properly initialized.
1874 */
1875 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1876
1877 /* Device presence detection is unreliable on some
1878 * controllers. Always poll IDENTIFY if available.
1879 */
1880 tf.flags |= ATA_TFLAG_POLLING;
1881
1882 if (ap->ops->read_id)
1883 err_mask = ap->ops->read_id(dev, &tf, id);
1884 else
1885 err_mask = ata_do_dev_read_id(dev, &tf, id);
1886
1887 if (err_mask) {
1888 if (err_mask & AC_ERR_NODEV_HINT) {
1889 ata_dev_dbg(dev, "NODEV after polling detection\n");
1890 return -ENOENT;
1891 }
1892
1893 if (is_semb) {
1894 ata_dev_info(dev,
1895 "IDENTIFY failed on device w/ SEMB sig, disabled\n");
1896 /* SEMB is not supported yet */
1897 *p_class = ATA_DEV_SEMB_UNSUP;
1898 return 0;
1899 }
1900
1901 if ((err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
1902 /* Device or controller might have reported
1903 * the wrong device class. Give a shot at the
1904 * other IDENTIFY if the current one is
1905 * aborted by the device.
1906 */
1907 if (may_fallback) {
1908 may_fallback = 0;
1909
1910 if (class == ATA_DEV_ATA)
1911 class = ATA_DEV_ATAPI;
1912 else
1913 class = ATA_DEV_ATA;
1914 goto retry;
1915 }
1916
1917 /* Control reaches here iff the device aborted
1918 * both flavors of IDENTIFYs which happens
1919 * sometimes with phantom devices.
1920 */
1921 ata_dev_dbg(dev,
1922 "both IDENTIFYs aborted, assuming NODEV\n");
1923 return -ENOENT;
1924 }
1925
1926 rc = -EIO;
1927 reason = "I/O error";
1928 goto err_out;
1929 }
1930
1931 if (dev->horkage & ATA_HORKAGE_DUMP_ID) {
1932 ata_dev_dbg(dev, "dumping IDENTIFY data, "
1933 "class=%d may_fallback=%d tried_spinup=%d\n",
1934 class, may_fallback, tried_spinup);
1935 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET,
1936 16, 2, id, ATA_ID_WORDS * sizeof(*id), true);
1937 }
1938
1939 /* Falling back doesn't make sense if ID data was read
1940 * successfully at least once.
1941 */
1942 may_fallback = 0;
1943
1944 swap_buf_le16(id, ATA_ID_WORDS);
1945
1946 /* sanity check */
1947 rc = -EINVAL;
1948 reason = "device reports invalid type";
1949
1950 if (class == ATA_DEV_ATA || class == ATA_DEV_ZAC) {
1951 if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
1952 goto err_out;
1953 if (ap->host->flags & ATA_HOST_IGNORE_ATA &&
1954 ata_id_is_ata(id)) {
1955 ata_dev_dbg(dev,
1956 "host indicates ignore ATA devices, ignored\n");
1957 return -ENOENT;
1958 }
1959 } else {
1960 if (ata_id_is_ata(id))
1961 goto err_out;
1962 }
1963
1964 if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) {
1965 tried_spinup = 1;
1966 /*
1967 * Drive powered-up in standby mode, and requires a specific
1968 * SET_FEATURES spin-up subcommand before it will accept
1969 * anything other than the original IDENTIFY command.
1970 */
1971 err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
1972 if (err_mask && id[2] != 0x738c) {
1973 rc = -EIO;
1974 reason = "SPINUP failed";
1975 goto err_out;
1976 }
1977 /*
1978 * If the drive initially returned incomplete IDENTIFY info,
1979 * we now must reissue the IDENTIFY command.
1980 */
1981 if (id[2] == 0x37c8)
1982 goto retry;
1983 }
1984
1985 if ((flags & ATA_READID_POSTRESET) &&
1986 (class == ATA_DEV_ATA || class == ATA_DEV_ZAC)) {
1987 /*
1988 * The exact sequence expected by certain pre-ATA4 drives is:
1989 * SRST RESET
1990 * IDENTIFY (optional in early ATA)
1991 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
1992 * anything else..
1993 * Some drives were very specific about that exact sequence.
1994 *
1995 * Note that ATA4 says lba is mandatory so the second check
1996 * should never trigger.
1997 */
1998 if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
1999 err_mask = ata_dev_init_params(dev, id[3], id[6]);
2000 if (err_mask) {
2001 rc = -EIO;
2002 reason = "INIT_DEV_PARAMS failed";
2003 goto err_out;
2004 }
2005
2006 /* current CHS translation info (id[53-58]) might be
2007 * changed. reread the identify device info.
2008 */
2009 flags &= ~ATA_READID_POSTRESET;
2010 goto retry;
2011 }
2012 }
2013
2014 *p_class = class;
2015
2016 return 0;
2017
2018 err_out:
2019 if (ata_msg_warn(ap))
2020 ata_dev_warn(dev, "failed to IDENTIFY (%s, err_mask=0x%x)\n",
2021 reason, err_mask);
2022 return rc;
2023 }
2024
2025 /**
2026 * ata_read_log_page - read a specific log page
2027 * @dev: target device
2028 * @log: log to read
2029 * @page: page to read
2030 * @buf: buffer to store read page
2031 * @sectors: number of sectors to read
2032 *
2033 * Read log page using READ_LOG_EXT command.
2034 *
2035 * LOCKING:
2036 * Kernel thread context (may sleep).
2037 *
2038 * RETURNS:
2039 * 0 on success, AC_ERR_* mask otherwise.
2040 */
2041 unsigned int ata_read_log_page(struct ata_device *dev, u8 log,
2042 u8 page, void *buf, unsigned int sectors)
2043 {
2044 unsigned long ap_flags = dev->link->ap->flags;
2045 struct ata_taskfile tf;
2046 unsigned int err_mask;
2047 bool dma = false;
2048
2049 DPRINTK("read log page - log 0x%x, page 0x%x\n", log, page);
2050
2051 /*
2052 * Return error without actually issuing the command on controllers
2053 * which e.g. lockup on a read log page.
2054 */
2055 if (ap_flags & ATA_FLAG_NO_LOG_PAGE)
2056 return AC_ERR_DEV;
2057
2058 retry:
2059 ata_tf_init(dev, &tf);
2060 if (dev->dma_mode && ata_id_has_read_log_dma_ext(dev->id) &&
2061 !(dev->horkage & ATA_HORKAGE_NO_DMA_LOG)) {
2062 tf.command = ATA_CMD_READ_LOG_DMA_EXT;
2063 tf.protocol = ATA_PROT_DMA;
2064 dma = true;
2065 } else {
2066 tf.command = ATA_CMD_READ_LOG_EXT;
2067 tf.protocol = ATA_PROT_PIO;
2068 dma = false;
2069 }
2070 tf.lbal = log;
2071 tf.lbam = page;
2072 tf.nsect = sectors;
2073 tf.hob_nsect = sectors >> 8;
2074 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_LBA48 | ATA_TFLAG_DEVICE;
2075
2076 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
2077 buf, sectors * ATA_SECT_SIZE, 0);
2078
2079 if (err_mask && dma) {
2080 dev->horkage |= ATA_HORKAGE_NO_DMA_LOG;
2081 ata_dev_warn(dev, "READ LOG DMA EXT failed, trying PIO\n");
2082 goto retry;
2083 }
2084
2085 DPRINTK("EXIT, err_mask=%x\n", err_mask);
2086 return err_mask;
2087 }
2088
2089 static bool ata_log_supported(struct ata_device *dev, u8 log)
2090 {
2091 struct ata_port *ap = dev->link->ap;
2092
2093 if (ata_read_log_page(dev, ATA_LOG_DIRECTORY, 0, ap->sector_buf, 1))
2094 return false;
2095 return get_unaligned_le16(&ap->sector_buf[log * 2]) ? true : false;
2096 }
2097
2098 static bool ata_identify_page_supported(struct ata_device *dev, u8 page)
2099 {
2100 struct ata_port *ap = dev->link->ap;
2101 unsigned int err, i;
2102
2103 if (!ata_log_supported(dev, ATA_LOG_IDENTIFY_DEVICE)) {
2104 ata_dev_warn(dev, "ATA Identify Device Log not supported\n");
2105 return false;
2106 }
2107
2108 /*
2109 * Read IDENTIFY DEVICE data log, page 0, to figure out if the page is
2110 * supported.
2111 */
2112 err = ata_read_log_page(dev, ATA_LOG_IDENTIFY_DEVICE, 0, ap->sector_buf,
2113 1);
2114 if (err) {
2115 ata_dev_info(dev,
2116 "failed to get Device Identify Log Emask 0x%x\n",
2117 err);
2118 return false;
2119 }
2120
2121 for (i = 0; i < ap->sector_buf[8]; i++) {
2122 if (ap->sector_buf[9 + i] == page)
2123 return true;
2124 }
2125
2126 return false;
2127 }
2128
2129 static int ata_do_link_spd_horkage(struct ata_device *dev)
2130 {
2131 struct ata_link *plink = ata_dev_phys_link(dev);
2132 u32 target, target_limit;
2133
2134 if (!sata_scr_valid(plink))
2135 return 0;
2136
2137 if (dev->horkage & ATA_HORKAGE_1_5_GBPS)
2138 target = 1;
2139 else
2140 return 0;
2141
2142 target_limit = (1 << target) - 1;
2143
2144 /* if already on stricter limit, no need to push further */
2145 if (plink->sata_spd_limit <= target_limit)
2146 return 0;
2147
2148 plink->sata_spd_limit = target_limit;
2149
2150 /* Request another EH round by returning -EAGAIN if link is
2151 * going faster than the target speed. Forward progress is
2152 * guaranteed by setting sata_spd_limit to target_limit above.
2153 */
2154 if (plink->sata_spd > target) {
2155 ata_dev_info(dev, "applying link speed limit horkage to %s\n",
2156 sata_spd_string(target));
2157 return -EAGAIN;
2158 }
2159 return 0;
2160 }
2161
2162 static inline u8 ata_dev_knobble(struct ata_device *dev)
2163 {
2164 struct ata_port *ap = dev->link->ap;
2165
2166 if (ata_dev_blacklisted(dev) & ATA_HORKAGE_BRIDGE_OK)
2167 return 0;
2168
2169 return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2170 }
2171
2172 static void ata_dev_config_ncq_send_recv(struct ata_device *dev)
2173 {
2174 struct ata_port *ap = dev->link->ap;
2175 unsigned int err_mask;
2176
2177 if (!ata_log_supported(dev, ATA_LOG_NCQ_SEND_RECV)) {
2178 ata_dev_warn(dev, "NCQ Send/Recv Log not supported\n");
2179 return;
2180 }
2181 err_mask = ata_read_log_page(dev, ATA_LOG_NCQ_SEND_RECV,
2182 0, ap->sector_buf, 1);
2183 if (err_mask) {
2184 ata_dev_dbg(dev,
2185 "failed to get NCQ Send/Recv Log Emask 0x%x\n",
2186 err_mask);
2187 } else {
2188 u8 *cmds = dev->ncq_send_recv_cmds;
2189
2190 dev->flags |= ATA_DFLAG_NCQ_SEND_RECV;
2191 memcpy(cmds, ap->sector_buf, ATA_LOG_NCQ_SEND_RECV_SIZE);
2192
2193 if (dev->horkage & ATA_HORKAGE_NO_NCQ_TRIM) {
2194 ata_dev_dbg(dev, "disabling queued TRIM support\n");
2195 cmds[ATA_LOG_NCQ_SEND_RECV_DSM_OFFSET] &=
2196 ~ATA_LOG_NCQ_SEND_RECV_DSM_TRIM;
2197 }
2198 }
2199 }
2200
2201 static void ata_dev_config_ncq_non_data(struct ata_device *dev)
2202 {
2203 struct ata_port *ap = dev->link->ap;
2204 unsigned int err_mask;
2205
2206 if (!ata_log_supported(dev, ATA_LOG_NCQ_NON_DATA)) {
2207 ata_dev_warn(dev,
2208 "NCQ Send/Recv Log not supported\n");
2209 return;
2210 }
2211 err_mask = ata_read_log_page(dev, ATA_LOG_NCQ_NON_DATA,
2212 0, ap->sector_buf, 1);
2213 if (err_mask) {
2214 ata_dev_dbg(dev,
2215 "failed to get NCQ Non-Data Log Emask 0x%x\n",
2216 err_mask);
2217 } else {
2218 u8 *cmds = dev->ncq_non_data_cmds;
2219
2220 memcpy(cmds, ap->sector_buf, ATA_LOG_NCQ_NON_DATA_SIZE);
2221 }
2222 }
2223
2224 static void ata_dev_config_ncq_prio(struct ata_device *dev)
2225 {
2226 struct ata_port *ap = dev->link->ap;
2227 unsigned int err_mask;
2228
2229 if (!(dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLE)) {
2230 dev->flags &= ~ATA_DFLAG_NCQ_PRIO;
2231 return;
2232 }
2233
2234 err_mask = ata_read_log_page(dev,
2235 ATA_LOG_IDENTIFY_DEVICE,
2236 ATA_LOG_SATA_SETTINGS,
2237 ap->sector_buf,
2238 1);
2239 if (err_mask) {
2240 ata_dev_dbg(dev,
2241 "failed to get Identify Device data, Emask 0x%x\n",
2242 err_mask);
2243 return;
2244 }
2245
2246 if (ap->sector_buf[ATA_LOG_NCQ_PRIO_OFFSET] & BIT(3)) {
2247 dev->flags |= ATA_DFLAG_NCQ_PRIO;
2248 } else {
2249 dev->flags &= ~ATA_DFLAG_NCQ_PRIO;
2250 ata_dev_dbg(dev, "SATA page does not support priority\n");
2251 }
2252
2253 }
2254
2255 static int ata_dev_config_ncq(struct ata_device *dev,
2256 char *desc, size_t desc_sz)
2257 {
2258 struct ata_port *ap = dev->link->ap;
2259 int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
2260 unsigned int err_mask;
2261 char *aa_desc = "";
2262
2263 if (!ata_id_has_ncq(dev->id)) {
2264 desc[0] = '\0';
2265 return 0;
2266 }
2267 if (dev->horkage & ATA_HORKAGE_NONCQ) {
2268 snprintf(desc, desc_sz, "NCQ (not used)");
2269 return 0;
2270 }
2271 if (ap->flags & ATA_FLAG_NCQ) {
2272 hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE);
2273 dev->flags |= ATA_DFLAG_NCQ;
2274 }
2275
2276 if (!(dev->horkage & ATA_HORKAGE_BROKEN_FPDMA_AA) &&
2277 (ap->flags & ATA_FLAG_FPDMA_AA) &&
2278 ata_id_has_fpdma_aa(dev->id)) {
2279 err_mask = ata_dev_set_feature(dev, SETFEATURES_SATA_ENABLE,
2280 SATA_FPDMA_AA);
2281 if (err_mask) {
2282 ata_dev_err(dev,
2283 "failed to enable AA (error_mask=0x%x)\n",
2284 err_mask);
2285 if (err_mask != AC_ERR_DEV) {
2286 dev->horkage |= ATA_HORKAGE_BROKEN_FPDMA_AA;
2287 return -EIO;
2288 }
2289 } else
2290 aa_desc = ", AA";
2291 }
2292
2293 if (hdepth >= ddepth)
2294 snprintf(desc, desc_sz, "NCQ (depth %d)%s", ddepth, aa_desc);
2295 else
2296 snprintf(desc, desc_sz, "NCQ (depth %d/%d)%s", hdepth,
2297 ddepth, aa_desc);
2298
2299 if ((ap->flags & ATA_FLAG_FPDMA_AUX)) {
2300 if (ata_id_has_ncq_send_and_recv(dev->id))
2301 ata_dev_config_ncq_send_recv(dev);
2302 if (ata_id_has_ncq_non_data(dev->id))
2303 ata_dev_config_ncq_non_data(dev);
2304 if (ata_id_has_ncq_prio(dev->id))
2305 ata_dev_config_ncq_prio(dev);
2306 }
2307
2308 return 0;
2309 }
2310
2311 static void ata_dev_config_sense_reporting(struct ata_device *dev)
2312 {
2313 unsigned int err_mask;
2314
2315 if (!ata_id_has_sense_reporting(dev->id))
2316 return;
2317
2318 if (ata_id_sense_reporting_enabled(dev->id))
2319 return;
2320
2321 err_mask = ata_dev_set_feature(dev, SETFEATURE_SENSE_DATA, 0x1);
2322 if (err_mask) {
2323 ata_dev_dbg(dev,
2324 "failed to enable Sense Data Reporting, Emask 0x%x\n",
2325 err_mask);
2326 }
2327 }
2328
2329 static void ata_dev_config_zac(struct ata_device *dev)
2330 {
2331 struct ata_port *ap = dev->link->ap;
2332 unsigned int err_mask;
2333 u8 *identify_buf = ap->sector_buf;
2334
2335 dev->zac_zones_optimal_open = U32_MAX;
2336 dev->zac_zones_optimal_nonseq = U32_MAX;
2337 dev->zac_zones_max_open = U32_MAX;
2338
2339 /*
2340 * Always set the 'ZAC' flag for Host-managed devices.
2341 */
2342 if (dev->class == ATA_DEV_ZAC)
2343 dev->flags |= ATA_DFLAG_ZAC;
2344 else if (ata_id_zoned_cap(dev->id) == 0x01)
2345 /*
2346 * Check for host-aware devices.
2347 */
2348 dev->flags |= ATA_DFLAG_ZAC;
2349
2350 if (!(dev->flags & ATA_DFLAG_ZAC))
2351 return;
2352
2353 if (!ata_identify_page_supported(dev, ATA_LOG_ZONED_INFORMATION)) {
2354 ata_dev_warn(dev,
2355 "ATA Zoned Information Log not supported\n");
2356 return;
2357 }
2358
2359 /*
2360 * Read IDENTIFY DEVICE data log, page 9 (Zoned-device information)
2361 */
2362 err_mask = ata_read_log_page(dev, ATA_LOG_IDENTIFY_DEVICE,
2363 ATA_LOG_ZONED_INFORMATION,
2364 identify_buf, 1);
2365 if (!err_mask) {
2366 u64 zoned_cap, opt_open, opt_nonseq, max_open;
2367
2368 zoned_cap = get_unaligned_le64(&identify_buf[8]);
2369 if ((zoned_cap >> 63))
2370 dev->zac_zoned_cap = (zoned_cap & 1);
2371 opt_open = get_unaligned_le64(&identify_buf[24]);
2372 if ((opt_open >> 63))
2373 dev->zac_zones_optimal_open = (u32)opt_open;
2374 opt_nonseq = get_unaligned_le64(&identify_buf[32]);
2375 if ((opt_nonseq >> 63))
2376 dev->zac_zones_optimal_nonseq = (u32)opt_nonseq;
2377 max_open = get_unaligned_le64(&identify_buf[40]);
2378 if ((max_open >> 63))
2379 dev->zac_zones_max_open = (u32)max_open;
2380 }
2381 }
2382
2383 static void ata_dev_config_trusted(struct ata_device *dev)
2384 {
2385 struct ata_port *ap = dev->link->ap;
2386 u64 trusted_cap;
2387 unsigned int err;
2388
2389 if (!ata_id_has_trusted(dev->id))
2390 return;
2391
2392 if (!ata_identify_page_supported(dev, ATA_LOG_SECURITY)) {
2393 ata_dev_warn(dev,
2394 "Security Log not supported\n");
2395 return;
2396 }
2397
2398 err = ata_read_log_page(dev, ATA_LOG_IDENTIFY_DEVICE, ATA_LOG_SECURITY,
2399 ap->sector_buf, 1);
2400 if (err) {
2401 ata_dev_dbg(dev,
2402 "failed to read Security Log, Emask 0x%x\n", err);
2403 return;
2404 }
2405
2406 trusted_cap = get_unaligned_le64(&ap->sector_buf[40]);
2407 if (!(trusted_cap & (1ULL << 63))) {
2408 ata_dev_dbg(dev,
2409 "Trusted Computing capability qword not valid!\n");
2410 return;
2411 }
2412
2413 if (trusted_cap & (1 << 0))
2414 dev->flags |= ATA_DFLAG_TRUSTED;
2415 }
2416
2417 /**
2418 * ata_dev_configure - Configure the specified ATA/ATAPI device
2419 * @dev: Target device to configure
2420 *
2421 * Configure @dev according to @dev->id. Generic and low-level
2422 * driver specific fixups are also applied.
2423 *
2424 * LOCKING:
2425 * Kernel thread context (may sleep)
2426 *
2427 * RETURNS:
2428 * 0 on success, -errno otherwise
2429 */
2430 int ata_dev_configure(struct ata_device *dev)
2431 {
2432 struct ata_port *ap = dev->link->ap;
2433 struct ata_eh_context *ehc = &dev->link->eh_context;
2434 int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2435 const u16 *id = dev->id;
2436 unsigned long xfer_mask;
2437 unsigned int err_mask;
2438 char revbuf[7]; /* XYZ-99\0 */
2439 char fwrevbuf[ATA_ID_FW_REV_LEN+1];
2440 char modelbuf[ATA_ID_PROD_LEN+1];
2441 int rc;
2442
2443 if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
2444 ata_dev_info(dev, "%s: ENTER/EXIT -- nodev\n", __func__);
2445 return 0;
2446 }
2447
2448 if (ata_msg_probe(ap))
2449 ata_dev_dbg(dev, "%s: ENTER\n", __func__);
2450
2451 /* set horkage */
2452 dev->horkage |= ata_dev_blacklisted(dev);
2453 ata_force_horkage(dev);
2454
2455 if (dev->horkage & ATA_HORKAGE_DISABLE) {
2456 ata_dev_info(dev, "unsupported device, disabling\n");
2457 ata_dev_disable(dev);
2458 return 0;
2459 }
2460
2461 if ((!atapi_enabled || (ap->flags & ATA_FLAG_NO_ATAPI)) &&
2462 dev->class == ATA_DEV_ATAPI) {
2463 ata_dev_warn(dev, "WARNING: ATAPI is %s, device ignored\n",
2464 atapi_enabled ? "not supported with this driver"
2465 : "disabled");
2466 ata_dev_disable(dev);
2467 return 0;
2468 }
2469
2470 rc = ata_do_link_spd_horkage(dev);
2471 if (rc)
2472 return rc;
2473
2474 /* some WD SATA-1 drives have issues with LPM, turn on NOLPM for them */
2475 if ((dev->horkage & ATA_HORKAGE_WD_BROKEN_LPM) &&
2476 (id[ATA_ID_SATA_CAPABILITY] & 0xe) == 0x2)
2477 dev->horkage |= ATA_HORKAGE_NOLPM;
2478
2479 if (ap->flags & ATA_FLAG_NO_LPM)
2480 dev->horkage |= ATA_HORKAGE_NOLPM;
2481
2482 if (dev->horkage & ATA_HORKAGE_NOLPM) {
2483 ata_dev_warn(dev, "LPM support broken, forcing max_power\n");
2484 dev->link->ap->target_lpm_policy = ATA_LPM_MAX_POWER;
2485 }
2486
2487 /* let ACPI work its magic */
2488 rc = ata_acpi_on_devcfg(dev);
2489 if (rc)
2490 return rc;
2491
2492 /* massage HPA, do it early as it might change IDENTIFY data */
2493 rc = ata_hpa_resize(dev);
2494 if (rc)
2495 return rc;
2496
2497 /* print device capabilities */
2498 if (ata_msg_probe(ap))
2499 ata_dev_dbg(dev,
2500 "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
2501 "85:%04x 86:%04x 87:%04x 88:%04x\n",
2502 __func__,
2503 id[49], id[82], id[83], id[84],
2504 id[85], id[86], id[87], id[88]);
2505
2506 /* initialize to-be-configured parameters */
2507 dev->flags &= ~ATA_DFLAG_CFG_MASK;
2508 dev->max_sectors = 0;
2509 dev->cdb_len = 0;
2510 dev->n_sectors = 0;
2511 dev->cylinders = 0;
2512 dev->heads = 0;
2513 dev->sectors = 0;
2514 dev->multi_count = 0;
2515
2516 /*
2517 * common ATA, ATAPI feature tests
2518 */
2519
2520 /* find max transfer mode; for printk only */
2521 xfer_mask = ata_id_xfermask(id);
2522
2523 if (ata_msg_probe(ap))
2524 ata_dump_id(id);
2525
2526 /* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
2527 ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
2528 sizeof(fwrevbuf));
2529
2530 ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
2531 sizeof(modelbuf));
2532
2533 /* ATA-specific feature tests */
2534 if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) {
2535 if (ata_id_is_cfa(id)) {
2536 /* CPRM may make this media unusable */
2537 if (id[ATA_ID_CFA_KEY_MGMT] & 1)
2538 ata_dev_warn(dev,
2539 "supports DRM functions and may not be fully accessible\n");
2540 snprintf(revbuf, 7, "CFA");
2541 } else {
2542 snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2543 /* Warn the user if the device has TPM extensions */
2544 if (ata_id_has_tpm(id))
2545 ata_dev_warn(dev,
2546 "supports DRM functions and may not be fully accessible\n");
2547 }
2548
2549 dev->n_sectors = ata_id_n_sectors(id);
2550
2551 /* get current R/W Multiple count setting */
2552 if ((dev->id[47] >> 8) == 0x80 && (dev->id[59] & 0x100)) {
2553 unsigned int max = dev->id[47] & 0xff;
2554 unsigned int cnt = dev->id[59] & 0xff;
2555 /* only recognize/allow powers of two here */
2556 if (is_power_of_2(max) && is_power_of_2(cnt))
2557 if (cnt <= max)
2558 dev->multi_count = cnt;
2559 }
2560
2561 if (ata_id_has_lba(id)) {
2562 const char *lba_desc;
2563 char ncq_desc[24];
2564
2565 lba_desc = "LBA";
2566 dev->flags |= ATA_DFLAG_LBA;
2567 if (ata_id_has_lba48(id)) {
2568 dev->flags |= ATA_DFLAG_LBA48;
2569 lba_desc = "LBA48";
2570
2571 if (dev->n_sectors >= (1UL << 28) &&
2572 ata_id_has_flush_ext(id))
2573 dev->flags |= ATA_DFLAG_FLUSH_EXT;
2574 }
2575
2576 /* config NCQ */
2577 rc = ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
2578 if (rc)
2579 return rc;
2580
2581 /* print device info to dmesg */
2582 if (ata_msg_drv(ap) && print_info) {
2583 ata_dev_info(dev, "%s: %s, %s, max %s\n",
2584 revbuf, modelbuf, fwrevbuf,
2585 ata_mode_string(xfer_mask));
2586 ata_dev_info(dev,
2587 "%llu sectors, multi %u: %s %s\n",
2588 (unsigned long long)dev->n_sectors,
2589 dev->multi_count, lba_desc, ncq_desc);
2590 }
2591 } else {
2592 /* CHS */
2593
2594 /* Default translation */
2595 dev->cylinders = id[1];
2596 dev->heads = id[3];
2597 dev->sectors = id[6];
2598
2599 if (ata_id_current_chs_valid(id)) {
2600 /* Current CHS translation is valid. */
2601 dev->cylinders = id[54];
2602 dev->heads = id[55];
2603 dev->sectors = id[56];
2604 }
2605
2606 /* print device info to dmesg */
2607 if (ata_msg_drv(ap) && print_info) {
2608 ata_dev_info(dev, "%s: %s, %s, max %s\n",
2609 revbuf, modelbuf, fwrevbuf,
2610 ata_mode_string(xfer_mask));
2611 ata_dev_info(dev,
2612 "%llu sectors, multi %u, CHS %u/%u/%u\n",
2613 (unsigned long long)dev->n_sectors,
2614 dev->multi_count, dev->cylinders,
2615 dev->heads, dev->sectors);
2616 }
2617 }
2618
2619 /* Check and mark DevSlp capability. Get DevSlp timing variables
2620 * from SATA Settings page of Identify Device Data Log.
2621 */
2622 if (ata_id_has_devslp(dev->id)) {
2623 u8 *sata_setting = ap->sector_buf;
2624 int i, j;
2625
2626 dev->flags |= ATA_DFLAG_DEVSLP;
2627 err_mask = ata_read_log_page(dev,
2628 ATA_LOG_IDENTIFY_DEVICE,
2629 ATA_LOG_SATA_SETTINGS,
2630 sata_setting,
2631 1);
2632 if (err_mask)
2633 ata_dev_dbg(dev,
2634 "failed to get Identify Device Data, Emask 0x%x\n",
2635 err_mask);
2636 else
2637 for (i = 0; i < ATA_LOG_DEVSLP_SIZE; i++) {
2638 j = ATA_LOG_DEVSLP_OFFSET + i;
2639 dev->devslp_timing[i] = sata_setting[j];
2640 }
2641 }
2642 ata_dev_config_sense_reporting(dev);
2643 ata_dev_config_zac(dev);
2644 ata_dev_config_trusted(dev);
2645 dev->cdb_len = 32;
2646 }
2647
2648 /* ATAPI-specific feature tests */
2649 else if (dev->class == ATA_DEV_ATAPI) {
2650 const char *cdb_intr_string = "";
2651 const char *atapi_an_string = "";
2652 const char *dma_dir_string = "";
2653 u32 sntf;
2654
2655 rc = atapi_cdb_len(id);
2656 if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2657 if (ata_msg_warn(ap))
2658 ata_dev_warn(dev, "unsupported CDB len\n");
2659 rc = -EINVAL;
2660 goto err_out_nosup;
2661 }
2662 dev->cdb_len = (unsigned int) rc;
2663
2664 /* Enable ATAPI AN if both the host and device have
2665 * the support. If PMP is attached, SNTF is required
2666 * to enable ATAPI AN to discern between PHY status
2667 * changed notifications and ATAPI ANs.
2668 */
2669 if (atapi_an &&
2670 (ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
2671 (!sata_pmp_attached(ap) ||
2672 sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
2673 /* issue SET feature command to turn this on */
2674 err_mask = ata_dev_set_feature(dev,
2675 SETFEATURES_SATA_ENABLE, SATA_AN);
2676 if (err_mask)
2677 ata_dev_err(dev,
2678 "failed to enable ATAPI AN (err_mask=0x%x)\n",
2679 err_mask);
2680 else {
2681 dev->flags |= ATA_DFLAG_AN;
2682 atapi_an_string = ", ATAPI AN";
2683 }
2684 }
2685
2686 if (ata_id_cdb_intr(dev->id)) {
2687 dev->flags |= ATA_DFLAG_CDB_INTR;
2688 cdb_intr_string = ", CDB intr";
2689 }
2690
2691 if (atapi_dmadir || (dev->horkage & ATA_HORKAGE_ATAPI_DMADIR) || atapi_id_dmadir(dev->id)) {
2692 dev->flags |= ATA_DFLAG_DMADIR;
2693 dma_dir_string = ", DMADIR";
2694 }
2695
2696 if (ata_id_has_da(dev->id)) {
2697 dev->flags |= ATA_DFLAG_DA;
2698 zpodd_init(dev);
2699 }
2700
2701 /* print device info to dmesg */
2702 if (ata_msg_drv(ap) && print_info)
2703 ata_dev_info(dev,
2704 "ATAPI: %s, %s, max %s%s%s%s\n",
2705 modelbuf, fwrevbuf,
2706 ata_mode_string(xfer_mask),
2707 cdb_intr_string, atapi_an_string,
2708 dma_dir_string);
2709 }
2710
2711 /* determine max_sectors */
2712 dev->max_sectors = ATA_MAX_SECTORS;
2713 if (dev->flags & ATA_DFLAG_LBA48)
2714 dev->max_sectors = ATA_MAX_SECTORS_LBA48;
2715
2716 /* Limit PATA drive on SATA cable bridge transfers to udma5,
2717 200 sectors */
2718 if (ata_dev_knobble(dev)) {
2719 if (ata_msg_drv(ap) && print_info)
2720 ata_dev_info(dev, "applying bridge limits\n");
2721 dev->udma_mask &= ATA_UDMA5;
2722 dev->max_sectors = ATA_MAX_SECTORS;
2723 }
2724
2725 if ((dev->class == ATA_DEV_ATAPI) &&
2726 (atapi_command_packet_set(id) == TYPE_TAPE)) {
2727 dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2728 dev->horkage |= ATA_HORKAGE_STUCK_ERR;
2729 }
2730
2731 if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2732 dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
2733 dev->max_sectors);
2734
2735 if (dev->horkage & ATA_HORKAGE_MAX_SEC_1024)
2736 dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_1024,
2737 dev->max_sectors);
2738
2739 if (dev->horkage & ATA_HORKAGE_MAX_SEC_LBA48)
2740 dev->max_sectors = ATA_MAX_SECTORS_LBA48;
2741
2742 if (ap->ops->dev_config)
2743 ap->ops->dev_config(dev);
2744
2745 if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
2746 /* Let the user know. We don't want to disallow opens for
2747 rescue purposes, or in case the vendor is just a blithering
2748 idiot. Do this after the dev_config call as some controllers
2749 with buggy firmware may want to avoid reporting false device
2750 bugs */
2751
2752 if (print_info) {
2753 ata_dev_warn(dev,
2754 "Drive reports diagnostics failure. This may indicate a drive\n");
2755 ata_dev_warn(dev,
2756 "fault or invalid emulation. Contact drive vendor for information.\n");
2757 }
2758 }
2759
2760 if ((dev->horkage & ATA_HORKAGE_FIRMWARE_WARN) && print_info) {
2761 ata_dev_warn(dev, "WARNING: device requires firmware update to be fully functional\n");
2762 ata_dev_warn(dev, " contact the vendor or visit http://ata.wiki.kernel.org\n");
2763 }
2764
2765 return 0;
2766
2767 err_out_nosup:
2768 if (ata_msg_probe(ap))
2769 ata_dev_dbg(dev, "%s: EXIT, err\n", __func__);
2770 return rc;
2771 }
2772
2773 /**
2774 * ata_cable_40wire - return 40 wire cable type
2775 * @ap: port
2776 *
2777 * Helper method for drivers which want to hardwire 40 wire cable
2778 * detection.
2779 */
2780
2781 int ata_cable_40wire(struct ata_port *ap)
2782 {
2783 return ATA_CBL_PATA40;
2784 }
2785
2786 /**
2787 * ata_cable_80wire - return 80 wire cable type
2788 * @ap: port
2789 *
2790 * Helper method for drivers which want to hardwire 80 wire cable
2791 * detection.
2792 */
2793
2794 int ata_cable_80wire(struct ata_port *ap)
2795 {
2796 return ATA_CBL_PATA80;
2797 }
2798
2799 /**
2800 * ata_cable_unknown - return unknown PATA cable.
2801 * @ap: port
2802 *
2803 * Helper method for drivers which have no PATA cable detection.
2804 */
2805
2806 int ata_cable_unknown(struct ata_port *ap)
2807 {
2808 return ATA_CBL_PATA_UNK;
2809 }
2810
2811 /**
2812 * ata_cable_ignore - return ignored PATA cable.
2813 * @ap: port
2814 *
2815 * Helper method for drivers which don't use cable type to limit
2816 * transfer mode.
2817 */
2818 int ata_cable_ignore(struct ata_port *ap)
2819 {
2820 return ATA_CBL_PATA_IGN;
2821 }
2822
2823 /**
2824 * ata_cable_sata - return SATA cable type
2825 * @ap: port
2826 *
2827 * Helper method for drivers which have SATA cables
2828 */
2829
2830 int ata_cable_sata(struct ata_port *ap)
2831 {
2832 return ATA_CBL_SATA;
2833 }
2834
2835 /**
2836 * ata_bus_probe - Reset and probe ATA bus
2837 * @ap: Bus to probe
2838 *
2839 * Master ATA bus probing function. Initiates a hardware-dependent
2840 * bus reset, then attempts to identify any devices found on
2841 * the bus.
2842 *
2843 * LOCKING:
2844 * PCI/etc. bus probe sem.
2845 *
2846 * RETURNS:
2847 * Zero on success, negative errno otherwise.
2848 */
2849
2850 int ata_bus_probe(struct ata_port *ap)
2851 {
2852 unsigned int classes[ATA_MAX_DEVICES];
2853 int tries[ATA_MAX_DEVICES];
2854 int rc;
2855 struct ata_device *dev;
2856
2857 ata_for_each_dev(dev, &ap->link, ALL)
2858 tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2859
2860 retry:
2861 ata_for_each_dev(dev, &ap->link, ALL) {
2862 /* If we issue an SRST then an ATA drive (not ATAPI)
2863 * may change configuration and be in PIO0 timing. If
2864 * we do a hard reset (or are coming from power on)
2865 * this is true for ATA or ATAPI. Until we've set a
2866 * suitable controller mode we should not touch the
2867 * bus as we may be talking too fast.
2868 */
2869 dev->pio_mode = XFER_PIO_0;
2870 dev->dma_mode = 0xff;
2871
2872 /* If the controller has a pio mode setup function
2873 * then use it to set the chipset to rights. Don't
2874 * touch the DMA setup as that will be dealt with when
2875 * configuring devices.
2876 */
2877 if (ap->ops->set_piomode)
2878 ap->ops->set_piomode(ap, dev);
2879 }
2880
2881 /* reset and determine device classes */
2882 ap->ops->phy_reset(ap);
2883
2884 ata_for_each_dev(dev, &ap->link, ALL) {
2885 if (dev->class != ATA_DEV_UNKNOWN)
2886 classes[dev->devno] = dev->class;
2887 else
2888 classes[dev->devno] = ATA_DEV_NONE;
2889
2890 dev->class = ATA_DEV_UNKNOWN;
2891 }
2892
2893 /* read IDENTIFY page and configure devices. We have to do the identify
2894 specific sequence bass-ackwards so that PDIAG- is released by
2895 the slave device */
2896
2897 ata_for_each_dev(dev, &ap->link, ALL_REVERSE) {
2898 if (tries[dev->devno])
2899 dev->class = classes[dev->devno];
2900
2901 if (!ata_dev_enabled(dev))
2902 continue;
2903
2904 rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
2905 dev->id);
2906 if (rc)
2907 goto fail;
2908 }
2909
2910 /* Now ask for the cable type as PDIAG- should have been released */
2911 if (ap->ops->cable_detect)
2912 ap->cbl = ap->ops->cable_detect(ap);
2913
2914 /* We may have SATA bridge glue hiding here irrespective of
2915 * the reported cable types and sensed types. When SATA
2916 * drives indicate we have a bridge, we don't know which end
2917 * of the link the bridge is which is a problem.
2918 */
2919 ata_for_each_dev(dev, &ap->link, ENABLED)
2920 if (ata_id_is_sata(dev->id))
2921 ap->cbl = ATA_CBL_SATA;
2922
2923 /* After the identify sequence we can now set up the devices. We do
2924 this in the normal order so that the user doesn't get confused */
2925
2926 ata_for_each_dev(dev, &ap->link, ENABLED) {
2927 ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2928 rc = ata_dev_configure(dev);
2929 ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2930 if (rc)
2931 goto fail;
2932 }
2933
2934 /* configure transfer mode */
2935 rc = ata_set_mode(&ap->link, &dev);
2936 if (rc)
2937 goto fail;
2938
2939 ata_for_each_dev(dev, &ap->link, ENABLED)
2940 return 0;
2941
2942 return -ENODEV;
2943
2944 fail:
2945 tries[dev->devno]--;
2946
2947 switch (rc) {
2948 case -EINVAL:
2949 /* eeek, something went very wrong, give up */
2950 tries[dev->devno] = 0;
2951 break;
2952
2953 case -ENODEV:
2954 /* give it just one more chance */
2955 tries[dev->devno] = min(tries[dev->devno], 1);
2956 /* fall through */
2957 case -EIO:
2958 if (tries[dev->devno] == 1) {
2959 /* This is the last chance, better to slow
2960 * down than lose it.
2961 */
2962 sata_down_spd_limit(&ap->link, 0);
2963 ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
2964 }
2965 }
2966
2967 if (!tries[dev->devno])
2968 ata_dev_disable(dev);
2969
2970 goto retry;
2971 }
2972
2973 /**
2974 * sata_print_link_status - Print SATA link status
2975 * @link: SATA link to printk link status about
2976 *
2977 * This function prints link speed and status of a SATA link.
2978 *
2979 * LOCKING:
2980 * None.
2981 */
2982 static void sata_print_link_status(struct ata_link *link)
2983 {
2984 u32 sstatus, scontrol, tmp;
2985
2986 if (sata_scr_read(link, SCR_STATUS, &sstatus))
2987 return;
2988 sata_scr_read(link, SCR_CONTROL, &scontrol);
2989
2990 if (ata_phys_link_online(link)) {
2991 tmp = (sstatus >> 4) & 0xf;
2992 ata_link_info(link, "SATA link up %s (SStatus %X SControl %X)\n",
2993 sata_spd_string(tmp), sstatus, scontrol);
2994 } else {
2995 ata_link_info(link, "SATA link down (SStatus %X SControl %X)\n",
2996 sstatus, scontrol);
2997 }
2998 }
2999
3000 /**
3001 * ata_dev_pair - return other device on cable
3002 * @adev: device
3003 *
3004 * Obtain the other device on the same cable, or if none is
3005 * present NULL is returned
3006 */
3007
3008 struct ata_device *ata_dev_pair(struct ata_device *adev)
3009 {
3010 struct ata_link *link = adev->link;
3011 struct ata_device *pair = &link->device[1 - adev->devno];
3012 if (!ata_dev_enabled(pair))
3013 return NULL;
3014 return pair;
3015 }
3016
3017 /**
3018 * sata_down_spd_limit - adjust SATA spd limit downward
3019 * @link: Link to adjust SATA spd limit for
3020 * @spd_limit: Additional limit
3021 *
3022 * Adjust SATA spd limit of @link downward. Note that this
3023 * function only adjusts the limit. The change must be applied
3024 * using sata_set_spd().
3025 *
3026 * If @spd_limit is non-zero, the speed is limited to equal to or
3027 * lower than @spd_limit if such speed is supported. If
3028 * @spd_limit is slower than any supported speed, only the lowest
3029 * supported speed is allowed.
3030 *
3031 * LOCKING:
3032 * Inherited from caller.
3033 *
3034 * RETURNS:
3035 * 0 on success, negative errno on failure
3036 */
3037 int sata_down_spd_limit(struct ata_link *link, u32 spd_limit)
3038 {
3039 u32 sstatus, spd, mask;
3040 int rc, bit;
3041
3042 if (!sata_scr_valid(link))
3043 return -EOPNOTSUPP;
3044
3045 /* If SCR can be read, use it to determine the current SPD.
3046 * If not, use cached value in link->sata_spd.
3047 */
3048 rc = sata_scr_read(link, SCR_STATUS, &sstatus);
3049 if (rc == 0 && ata_sstatus_online(sstatus))
3050 spd = (sstatus >> 4) & 0xf;
3051 else
3052 spd = link->sata_spd;
3053
3054 mask = link->sata_spd_limit;
3055 if (mask <= 1)
3056 return -EINVAL;
3057
3058 /* unconditionally mask off the highest bit */
3059 bit = fls(mask) - 1;
3060 mask &= ~(1 << bit);
3061
3062 /*
3063 * Mask off all speeds higher than or equal to the current one. At
3064 * this point, if current SPD is not available and we previously
3065 * recorded the link speed from SStatus, the driver has already
3066 * masked off the highest bit so mask should already be 1 or 0.
3067 * Otherwise, we should not force 1.5Gbps on a link where we have
3068 * not previously recorded speed from SStatus. Just return in this
3069 * case.
3070 */
3071 if (spd > 1)
3072 mask &= (1 << (spd - 1)) - 1;
3073 else
3074 return -EINVAL;
3075
3076 /* were we already at the bottom? */
3077 if (!mask)
3078 return -EINVAL;
3079
3080 if (spd_limit) {
3081 if (mask & ((1 << spd_limit) - 1))
3082 mask &= (1 << spd_limit) - 1;
3083 else {
3084 bit = ffs(mask) - 1;
3085 mask = 1 << bit;
3086 }
3087 }
3088
3089 link->sata_spd_limit = mask;
3090
3091 ata_link_warn(link, "limiting SATA link speed to %s\n",
3092 sata_spd_string(fls(mask)));
3093
3094 return 0;
3095 }
3096
3097 static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
3098 {
3099 struct ata_link *host_link = &link->ap->link;
3100 u32 limit, target, spd;
3101
3102 limit = link->sata_spd_limit;
3103
3104 /* Don't configure downstream link faster than upstream link.
3105 * It doesn't speed up anything and some PMPs choke on such
3106 * configuration.
3107 */
3108 if (!ata_is_host_link(link) && host_link->sata_spd)
3109 limit &= (1 << host_link->sata_spd) - 1;
3110
3111 if (limit == UINT_MAX)
3112 target = 0;
3113 else
3114 target = fls(limit);
3115
3116 spd = (*scontrol >> 4) & 0xf;
3117 *scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
3118
3119 return spd != target;
3120 }
3121
3122 /**
3123 * sata_set_spd_needed - is SATA spd configuration needed
3124 * @link: Link in question
3125 *
3126 * Test whether the spd limit in SControl matches
3127 * @link->sata_spd_limit. This function is used to determine
3128 * whether hardreset is necessary to apply SATA spd
3129 * configuration.
3130 *
3131 * LOCKING:
3132 * Inherited from caller.
3133 *
3134 * RETURNS:
3135 * 1 if SATA spd configuration is needed, 0 otherwise.
3136 */
3137 static int sata_set_spd_needed(struct ata_link *link)
3138 {
3139 u32 scontrol;
3140
3141 if (sata_scr_read(link, SCR_CONTROL, &scontrol))
3142 return 1;
3143
3144 return __sata_set_spd_needed(link, &scontrol);
3145 }
3146
3147 /**
3148 * sata_set_spd - set SATA spd according to spd limit
3149 * @link: Link to set SATA spd for
3150 *
3151 * Set SATA spd of @link according to sata_spd_limit.
3152 *
3153 * LOCKING:
3154 * Inherited from caller.
3155 *
3156 * RETURNS:
3157 * 0 if spd doesn't need to be changed, 1 if spd has been
3158 * changed. Negative errno if SCR registers are inaccessible.
3159 */
3160 int sata_set_spd(struct ata_link *link)
3161 {
3162 u32 scontrol;
3163 int rc;
3164
3165 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3166 return rc;
3167
3168 if (!__sata_set_spd_needed(link, &scontrol))
3169 return 0;
3170
3171 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3172 return rc;
3173
3174 return 1;
3175 }
3176
3177 /*
3178 * This mode timing computation functionality is ported over from
3179 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
3180 */
3181 /*
3182 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
3183 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
3184 * for UDMA6, which is currently supported only by Maxtor drives.
3185 *
3186 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
3187 */
3188
3189 static const struct ata_timing ata_timing[] = {
3190 /* { XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 0, 960, 0 }, */
3191 { XFER_PIO_0, 70, 290, 240, 600, 165, 150, 0, 600, 0 },
3192 { XFER_PIO_1, 50, 290, 93, 383, 125, 100, 0, 383, 0 },
3193 { XFER_PIO_2, 30, 290, 40, 330, 100, 90, 0, 240, 0 },
3194 { XFER_PIO_3, 30, 80, 70, 180, 80, 70, 0, 180, 0 },
3195 { XFER_PIO_4, 25, 70, 25, 120, 70, 25, 0, 120, 0 },
3196 { XFER_PIO_5, 15, 65, 25, 100, 65, 25, 0, 100, 0 },
3197 { XFER_PIO_6, 10, 55, 20, 80, 55, 20, 0, 80, 0 },
3198
3199 { XFER_SW_DMA_0, 120, 0, 0, 0, 480, 480, 50, 960, 0 },
3200 { XFER_SW_DMA_1, 90, 0, 0, 0, 240, 240, 30, 480, 0 },
3201 { XFER_SW_DMA_2, 60, 0, 0, 0, 120, 120, 20, 240, 0 },
3202
3203 { XFER_MW_DMA_0, 60, 0, 0, 0, 215, 215, 20, 480, 0 },
3204 { XFER_MW_DMA_1, 45, 0, 0, 0, 80, 50, 5, 150, 0 },
3205 { XFER_MW_DMA_2, 25, 0, 0, 0, 70, 25, 5, 120, 0 },
3206 { XFER_MW_DMA_3, 25, 0, 0, 0, 65, 25, 5, 100, 0 },
3207 { XFER_MW_DMA_4, 25, 0, 0, 0, 55, 20, 5, 80, 0 },
3208
3209 /* { XFER_UDMA_SLOW, 0, 0, 0, 0, 0, 0, 0, 0, 150 }, */
3210 { XFER_UDMA_0, 0, 0, 0, 0, 0, 0, 0, 0, 120 },
3211 { XFER_UDMA_1, 0, 0, 0, 0, 0, 0, 0, 0, 80 },
3212 { XFER_UDMA_2, 0, 0, 0, 0, 0, 0, 0, 0, 60 },
3213 { XFER_UDMA_3, 0, 0, 0, 0, 0, 0, 0, 0, 45 },
3214 { XFER_UDMA_4, 0, 0, 0, 0, 0, 0, 0, 0, 30 },
3215 { XFER_UDMA_5, 0, 0, 0, 0, 0, 0, 0, 0, 20 },
3216 { XFER_UDMA_6, 0, 0, 0, 0, 0, 0, 0, 0, 15 },
3217
3218 { 0xFF }
3219 };
3220
3221 #define ENOUGH(v, unit) (((v)-1)/(unit)+1)
3222 #define EZ(v, unit) ((v)?ENOUGH(((v) * 1000), unit):0)
3223
3224 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
3225 {
3226 q->setup = EZ(t->setup, T);
3227 q->act8b = EZ(t->act8b, T);
3228 q->rec8b = EZ(t->rec8b, T);
3229 q->cyc8b = EZ(t->cyc8b, T);
3230 q->active = EZ(t->active, T);
3231 q->recover = EZ(t->recover, T);
3232 q->dmack_hold = EZ(t->dmack_hold, T);
3233 q->cycle = EZ(t->cycle, T);
3234 q->udma = EZ(t->udma, UT);
3235 }
3236
3237 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
3238 struct ata_timing *m, unsigned int what)
3239 {
3240 if (what & ATA_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
3241 if (what & ATA_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
3242 if (what & ATA_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
3243 if (what & ATA_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
3244 if (what & ATA_TIMING_ACTIVE ) m->active = max(a->active, b->active);
3245 if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
3246 if (what & ATA_TIMING_DMACK_HOLD) m->dmack_hold = max(a->dmack_hold, b->dmack_hold);
3247 if (what & ATA_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
3248 if (what & ATA_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
3249 }
3250
3251 const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
3252 {
3253 const struct ata_timing *t = ata_timing;
3254
3255 while (xfer_mode > t->mode)
3256 t++;
3257
3258 if (xfer_mode == t->mode)
3259 return t;
3260
3261 WARN_ONCE(true, "%s: unable to find timing for xfer_mode 0x%x\n",
3262 __func__, xfer_mode);
3263
3264 return NULL;
3265 }
3266
3267 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
3268 struct ata_timing *t, int T, int UT)
3269 {
3270 const u16 *id = adev->id;
3271 const struct ata_timing *s;
3272 struct ata_timing p;
3273
3274 /*
3275 * Find the mode.
3276 */
3277
3278 if (!(s = ata_timing_find_mode(speed)))
3279 return -EINVAL;
3280
3281 memcpy(t, s, sizeof(*s));
3282
3283 /*
3284 * If the drive is an EIDE drive, it can tell us it needs extended
3285 * PIO/MW_DMA cycle timing.
3286 */
3287
3288 if (id[ATA_ID_FIELD_VALID] & 2) { /* EIDE drive */
3289 memset(&p, 0, sizeof(p));
3290
3291 if (speed >= XFER_PIO_0 && speed < XFER_SW_DMA_0) {
3292 if (speed <= XFER_PIO_2)
3293 p.cycle = p.cyc8b = id[ATA_ID_EIDE_PIO];
3294 else if ((speed <= XFER_PIO_4) ||
3295 (speed == XFER_PIO_5 && !ata_id_is_cfa(id)))
3296 p.cycle = p.cyc8b = id[ATA_ID_EIDE_PIO_IORDY];
3297 } else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2)
3298 p.cycle = id[ATA_ID_EIDE_DMA_MIN];
3299
3300 ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
3301 }
3302
3303 /*
3304 * Convert the timing to bus clock counts.
3305 */
3306
3307 ata_timing_quantize(t, t, T, UT);
3308
3309 /*
3310 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
3311 * S.M.A.R.T * and some other commands. We have to ensure that the
3312 * DMA cycle timing is slower/equal than the fastest PIO timing.
3313 */
3314
3315 if (speed > XFER_PIO_6) {
3316 ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
3317 ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
3318 }
3319
3320 /*
3321 * Lengthen active & recovery time so that cycle time is correct.
3322 */
3323
3324 if (t->act8b + t->rec8b < t->cyc8b) {
3325 t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
3326 t->rec8b = t->cyc8b - t->act8b;
3327 }
3328
3329 if (t->active + t->recover < t->cycle) {
3330 t->active += (t->cycle - (t->active + t->recover)) / 2;
3331 t->recover = t->cycle - t->active;
3332 }
3333
3334 /* In a few cases quantisation may produce enough errors to
3335 leave t->cycle too low for the sum of active and recovery
3336 if so we must correct this */
3337 if (t->active + t->recover > t->cycle)
3338 t->cycle = t->active + t->recover;
3339
3340 return 0;
3341 }
3342
3343 /**
3344 * ata_timing_cycle2mode - find xfer mode for the specified cycle duration
3345 * @xfer_shift: ATA_SHIFT_* value for transfer type to examine.
3346 * @cycle: cycle duration in ns
3347 *
3348 * Return matching xfer mode for @cycle. The returned mode is of
3349 * the transfer type specified by @xfer_shift. If @cycle is too
3350 * slow for @xfer_shift, 0xff is returned. If @cycle is faster
3351 * than the fastest known mode, the fasted mode is returned.
3352 *
3353 * LOCKING:
3354 * None.
3355 *
3356 * RETURNS:
3357 * Matching xfer_mode, 0xff if no match found.
3358 */
3359 u8 ata_timing_cycle2mode(unsigned int xfer_shift, int cycle)
3360 {
3361 u8 base_mode = 0xff, last_mode = 0xff;
3362 const struct ata_xfer_ent *ent;
3363 const struct ata_timing *t;
3364
3365 for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
3366 if (ent->shift == xfer_shift)
3367 base_mode = ent->base;
3368
3369 for (t = ata_timing_find_mode(base_mode);
3370 t && ata_xfer_mode2shift(t->mode) == xfer_shift; t++) {
3371 unsigned short this_cycle;
3372
3373 switch (xfer_shift) {
3374 case ATA_SHIFT_PIO:
3375 case ATA_SHIFT_MWDMA:
3376 this_cycle = t->cycle;
3377 break;
3378 case ATA_SHIFT_UDMA:
3379 this_cycle = t->udma;
3380 break;
3381 default:
3382 return 0xff;
3383 }
3384
3385 if (cycle > this_cycle)
3386 break;
3387
3388 last_mode = t->mode;
3389 }
3390
3391 return last_mode;
3392 }
3393
3394 /**
3395 * ata_down_xfermask_limit - adjust dev xfer masks downward
3396 * @dev: Device to adjust xfer masks
3397 * @sel: ATA_DNXFER_* selector
3398 *
3399 * Adjust xfer masks of @dev downward. Note that this function
3400 * does not apply the change. Invoking ata_set_mode() afterwards
3401 * will apply the limit.
3402 *
3403 * LOCKING:
3404 * Inherited from caller.
3405 *
3406 * RETURNS:
3407 * 0 on success, negative errno on failure
3408 */
3409 int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
3410 {
3411 char buf[32];
3412 unsigned long orig_mask, xfer_mask;
3413 unsigned long pio_mask, mwdma_mask, udma_mask;
3414 int quiet, highbit;
3415
3416 quiet = !!(sel & ATA_DNXFER_QUIET);
3417 sel &= ~ATA_DNXFER_QUIET;
3418
3419 xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
3420 dev->mwdma_mask,
3421 dev->udma_mask);
3422 ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
3423
3424 switch (sel) {
3425 case ATA_DNXFER_PIO:
3426 highbit = fls(pio_mask) - 1;
3427 pio_mask &= ~(1 << highbit);
3428 break;
3429
3430 case ATA_DNXFER_DMA:
3431 if (udma_mask) {
3432 highbit = fls(udma_mask) - 1;
3433 udma_mask &= ~(1 << highbit);
3434 if (!udma_mask)
3435 return -ENOENT;
3436 } else if (mwdma_mask) {
3437 highbit = fls(mwdma_mask) - 1;
3438 mwdma_mask &= ~(1 << highbit);
3439 if (!mwdma_mask)
3440 return -ENOENT;
3441 }
3442 break;
3443
3444 case ATA_DNXFER_40C:
3445 udma_mask &= ATA_UDMA_MASK_40C;
3446 break;
3447
3448 case ATA_DNXFER_FORCE_PIO0:
3449 pio_mask &= 1;
3450 /* fall through */
3451 case ATA_DNXFER_FORCE_PIO:
3452 mwdma_mask = 0;
3453 udma_mask = 0;
3454 break;
3455
3456 default:
3457 BUG();
3458 }
3459
3460 xfer_mask &= ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
3461
3462 if (!(xfer_mask & ATA_MASK_PIO) || xfer_mask == orig_mask)
3463 return -ENOENT;
3464
3465 if (!quiet) {
3466 if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
3467 snprintf(buf, sizeof(buf), "%s:%s",
3468 ata_mode_string(xfer_mask),
3469 ata_mode_string(xfer_mask & ATA_MASK_PIO));
3470 else
3471 snprintf(buf, sizeof(buf), "%s",
3472 ata_mode_string(xfer_mask));
3473
3474 ata_dev_warn(dev, "limiting speed to %s\n", buf);
3475 }
3476
3477 ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
3478 &dev->udma_mask);
3479
3480 return 0;
3481 }
3482
3483 static int ata_dev_set_mode(struct ata_device *dev)
3484 {
3485 struct ata_port *ap = dev->link->ap;
3486 struct ata_eh_context *ehc = &dev->link->eh_context;
3487 const bool nosetxfer = dev->horkage & ATA_HORKAGE_NOSETXFER;
3488 const char *dev_err_whine = "";
3489 int ign_dev_err = 0;
3490 unsigned int err_mask = 0;
3491 int rc;
3492
3493 dev->flags &= ~ATA_DFLAG_PIO;
3494 if (dev->xfer_shift == ATA_SHIFT_PIO)
3495 dev->flags |= ATA_DFLAG_PIO;
3496
3497 if (nosetxfer && ap->flags & ATA_FLAG_SATA && ata_id_is_sata(dev->id))
3498 dev_err_whine = " (SET_XFERMODE skipped)";
3499 else {
3500 if (nosetxfer)
3501 ata_dev_warn(dev,
3502 "NOSETXFER but PATA detected - can't "
3503 "skip SETXFER, might malfunction\n");
3504 err_mask = ata_dev_set_xfermode(dev);
3505 }
3506
3507 if (err_mask & ~AC_ERR_DEV)
3508 goto fail;
3509
3510 /* revalidate */
3511 ehc->i.flags |= ATA_EHI_POST_SETMODE;
3512 rc = ata_dev_revalidate(dev, ATA_DEV_UNKNOWN, 0);
3513 ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
3514 if (rc)
3515 return rc;
3516
3517 if (dev->xfer_shift == ATA_SHIFT_PIO) {
3518 /* Old CFA may refuse this command, which is just fine */
3519 if (ata_id_is_cfa(dev->id))
3520 ign_dev_err = 1;
3521 /* Catch several broken garbage emulations plus some pre
3522 ATA devices */
3523 if (ata_id_major_version(dev->id) == 0 &&
3524 dev->pio_mode <= XFER_PIO_2)
3525 ign_dev_err = 1;
3526 /* Some very old devices and some bad newer ones fail
3527 any kind of SET_XFERMODE request but support PIO0-2
3528 timings and no IORDY */
3529 if (!ata_id_has_iordy(dev->id) && dev->pio_mode <= XFER_PIO_2)
3530 ign_dev_err = 1;
3531 }
3532 /* Early MWDMA devices do DMA but don't allow DMA mode setting.
3533 Don't fail an MWDMA0 set IFF the device indicates it is in MWDMA0 */
3534 if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3535 dev->dma_mode == XFER_MW_DMA_0 &&
3536 (dev->id[63] >> 8) & 1)
3537 ign_dev_err = 1;
3538
3539 /* if the device is actually configured correctly, ignore dev err */
3540 if (dev->xfer_mode == ata_xfer_mask2mode(ata_id_xfermask(dev->id)))
3541 ign_dev_err = 1;
3542
3543 if (err_mask & AC_ERR_DEV) {
3544 if (!ign_dev_err)
3545 goto fail;
3546 else
3547 dev_err_whine = " (device error ignored)";
3548 }
3549
3550 DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
3551 dev->xfer_shift, (int)dev->xfer_mode);
3552
3553 if (!(ehc->i.flags & ATA_EHI_QUIET) ||
3554 ehc->i.flags & ATA_EHI_DID_HARDRESET)
3555 ata_dev_info(dev, "configured for %s%s\n",
3556 ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)),
3557 dev_err_whine);
3558
3559 return 0;
3560
3561 fail:
3562 ata_dev_err(dev, "failed to set xfermode (err_mask=0x%x)\n", err_mask);
3563 return -EIO;
3564 }
3565
3566 /**
3567 * ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3568 * @link: link on which timings will be programmed
3569 * @r_failed_dev: out parameter for failed device
3570 *
3571 * Standard implementation of the function used to tune and set
3572 * ATA device disk transfer mode (PIO3, UDMA6, etc.). If
3573 * ata_dev_set_mode() fails, pointer to the failing device is
3574 * returned in @r_failed_dev.
3575 *
3576 * LOCKING:
3577 * PCI/etc. bus probe sem.
3578 *
3579 * RETURNS:
3580 * 0 on success, negative errno otherwise
3581 */
3582
3583 int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3584 {
3585 struct ata_port *ap = link->ap;
3586 struct ata_device *dev;
3587 int rc = 0, used_dma = 0, found = 0;
3588
3589 /* step 1: calculate xfer_mask */
3590 ata_for_each_dev(dev, link, ENABLED) {
3591 unsigned long pio_mask, dma_mask;
3592 unsigned int mode_mask;
3593
3594 mode_mask = ATA_DMA_MASK_ATA;
3595 if (dev->class == ATA_DEV_ATAPI)
3596 mode_mask = ATA_DMA_MASK_ATAPI;
3597 else if (ata_id_is_cfa(dev->id))
3598 mode_mask = ATA_DMA_MASK_CFA;
3599
3600 ata_dev_xfermask(dev);
3601 ata_force_xfermask(dev);
3602
3603 pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
3604
3605 if (libata_dma_mask & mode_mask)
3606 dma_mask = ata_pack_xfermask(0, dev->mwdma_mask,
3607 dev->udma_mask);
3608 else
3609 dma_mask = 0;
3610
3611 dev->pio_mode = ata_xfer_mask2mode(pio_mask);
3612 dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3613
3614 found = 1;
3615 if (ata_dma_enabled(dev))
3616 used_dma = 1;
3617 }
3618 if (!found)
3619 goto out;
3620
3621 /* step 2: always set host PIO timings */
3622 ata_for_each_dev(dev, link, ENABLED) {
3623 if (dev->pio_mode == 0xff) {
3624 ata_dev_warn(dev, "no PIO support\n");
3625 rc = -EINVAL;
3626 goto out;
3627 }
3628
3629 dev->xfer_mode = dev->pio_mode;
3630 dev->xfer_shift = ATA_SHIFT_PIO;
3631 if (ap->ops->set_piomode)
3632 ap->ops->set_piomode(ap, dev);
3633 }
3634
3635 /* step 3: set host DMA timings */
3636 ata_for_each_dev(dev, link, ENABLED) {
3637 if (!ata_dma_enabled(dev))
3638 continue;
3639
3640 dev->xfer_mode = dev->dma_mode;
3641 dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
3642 if (ap->ops->set_dmamode)
3643 ap->ops->set_dmamode(ap, dev);
3644 }
3645
3646 /* step 4: update devices' xfer mode */
3647 ata_for_each_dev(dev, link, ENABLED) {
3648 rc = ata_dev_set_mode(dev);
3649 if (rc)
3650 goto out;
3651 }
3652
3653 /* Record simplex status. If we selected DMA then the other
3654 * host channels are not permitted to do so.
3655 */
3656 if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
3657 ap->host->simplex_claimed = ap;
3658
3659 out:
3660 if (rc)
3661 *r_failed_dev = dev;
3662 return rc;
3663 }
3664
3665 /**
3666 * ata_wait_ready - wait for link to become ready
3667 * @link: link to be waited on
3668 * @deadline: deadline jiffies for the operation
3669 * @check_ready: callback to check link readiness
3670 *
3671 * Wait for @link to become ready. @check_ready should return
3672 * positive number if @link is ready, 0 if it isn't, -ENODEV if
3673 * link doesn't seem to be occupied, other errno for other error
3674 * conditions.
3675 *
3676 * Transient -ENODEV conditions are allowed for
3677 * ATA_TMOUT_FF_WAIT.
3678 *
3679 * LOCKING:
3680 * EH context.
3681 *
3682 * RETURNS:
3683 * 0 if @link is ready before @deadline; otherwise, -errno.
3684 */
3685 int ata_wait_ready(struct ata_link *link, unsigned long deadline,
3686 int (*check_ready)(struct ata_link *link))
3687 {
3688 unsigned long start = jiffies;
3689 unsigned long nodev_deadline;
3690 int warned = 0;
3691
3692 /* choose which 0xff timeout to use, read comment in libata.h */
3693 if (link->ap->host->flags & ATA_HOST_PARALLEL_SCAN)
3694 nodev_deadline = ata_deadline(start, ATA_TMOUT_FF_WAIT_LONG);
3695 else
3696 nodev_deadline = ata_deadline(start, ATA_TMOUT_FF_WAIT);
3697
3698 /* Slave readiness can't be tested separately from master. On
3699 * M/S emulation configuration, this function should be called
3700 * only on the master and it will handle both master and slave.
3701 */
3702 WARN_ON(link == link->ap->slave_link);
3703
3704 if (time_after(nodev_deadline, deadline))
3705 nodev_deadline = deadline;
3706
3707 while (1) {
3708 unsigned long now = jiffies;
3709 int ready, tmp;
3710
3711 ready = tmp = check_ready(link);
3712 if (ready > 0)
3713 return 0;
3714
3715 /*
3716 * -ENODEV could be transient. Ignore -ENODEV if link
3717 * is online. Also, some SATA devices take a long
3718 * time to clear 0xff after reset. Wait for
3719 * ATA_TMOUT_FF_WAIT[_LONG] on -ENODEV if link isn't
3720 * offline.
3721 *
3722 * Note that some PATA controllers (pata_ali) explode
3723 * if status register is read more than once when
3724 * there's no device attached.
3725 */
3726 if (ready == -ENODEV) {
3727 if (ata_link_online(link))
3728 ready = 0;
3729 else if ((link->ap->flags & ATA_FLAG_SATA) &&
3730 !ata_link_offline(link) &&
3731 time_before(now, nodev_deadline))
3732 ready = 0;
3733 }
3734
3735 if (ready)
3736 return ready;
3737 if (time_after(now, deadline))
3738 return -EBUSY;
3739
3740 if (!warned && time_after(now, start + 5 * HZ) &&
3741 (deadline - now > 3 * HZ)) {
3742 ata_link_warn(link,
3743 "link is slow to respond, please be patient "
3744 "(ready=%d)\n", tmp);
3745 warned = 1;
3746 }
3747
3748 ata_msleep(link->ap, 50);
3749 }
3750 }
3751
3752 /**
3753 * ata_wait_after_reset - wait for link to become ready after reset
3754 * @link: link to be waited on
3755 * @deadline: deadline jiffies for the operation
3756 * @check_ready: callback to check link readiness
3757 *
3758 * Wait for @link to become ready after reset.
3759 *
3760 * LOCKING:
3761 * EH context.
3762 *
3763 * RETURNS:
3764 * 0 if @link is ready before @deadline; otherwise, -errno.
3765 */
3766 int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
3767 int (*check_ready)(struct ata_link *link))
3768 {
3769 ata_msleep(link->ap, ATA_WAIT_AFTER_RESET);
3770
3771 return ata_wait_ready(link, deadline, check_ready);
3772 }
3773
3774 /**
3775 * sata_link_debounce - debounce SATA phy status
3776 * @link: ATA link to debounce SATA phy status for
3777 * @params: timing parameters { interval, duration, timeout } in msec
3778 * @deadline: deadline jiffies for the operation
3779 *
3780 * Make sure SStatus of @link reaches stable state, determined by
3781 * holding the same value where DET is not 1 for @duration polled
3782 * every @interval, before @timeout. Timeout constraints the
3783 * beginning of the stable state. Because DET gets stuck at 1 on
3784 * some controllers after hot unplugging, this functions waits
3785 * until timeout then returns 0 if DET is stable at 1.
3786 *
3787 * @timeout is further limited by @deadline. The sooner of the
3788 * two is used.
3789 *
3790 * LOCKING:
3791 * Kernel thread context (may sleep)
3792 *
3793 * RETURNS:
3794 * 0 on success, -errno on failure.
3795 */
3796 int sata_link_debounce(struct ata_link *link, const unsigned long *params,
3797 unsigned long deadline)
3798 {
3799 unsigned long interval = params[0];
3800 unsigned long duration = params[1];
3801 unsigned long last_jiffies, t;
3802 u32 last, cur;
3803 int rc;
3804
3805 t = ata_deadline(jiffies, params[2]);
3806 if (time_before(t, deadline))
3807 deadline = t;
3808
3809 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3810 return rc;
3811 cur &= 0xf;
3812
3813 last = cur;
3814 last_jiffies = jiffies;
3815
3816 while (1) {
3817 ata_msleep(link->ap, interval);
3818 if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3819 return rc;
3820 cur &= 0xf;
3821
3822 /* DET stable? */
3823 if (cur == last) {
3824 if (cur == 1 && time_before(jiffies, deadline))
3825 continue;
3826 if (time_after(jiffies,
3827 ata_deadline(last_jiffies, duration)))
3828 return 0;
3829 continue;
3830 }
3831
3832 /* unstable, start over */
3833 last = cur;
3834 last_jiffies = jiffies;
3835
3836 /* Check deadline. If debouncing failed, return
3837 * -EPIPE to tell upper layer to lower link speed.
3838 */
3839 if (time_after(jiffies, deadline))
3840 return -EPIPE;
3841 }
3842 }
3843
3844 /**
3845 * sata_link_resume - resume SATA link
3846 * @link: ATA link to resume SATA
3847 * @params: timing parameters { interval, duration, timeout } in msec
3848 * @deadline: deadline jiffies for the operation
3849 *
3850 * Resume SATA phy @link and debounce it.
3851 *
3852 * LOCKING:
3853 * Kernel thread context (may sleep)
3854 *
3855 * RETURNS:
3856 * 0 on success, -errno on failure.
3857 */
3858 int sata_link_resume(struct ata_link *link, const unsigned long *params,
3859 unsigned long deadline)
3860 {
3861 int tries = ATA_LINK_RESUME_TRIES;
3862 u32 scontrol, serror;
3863 int rc;
3864
3865 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3866 return rc;
3867
3868 /*
3869 * Writes to SControl sometimes get ignored under certain
3870 * controllers (ata_piix SIDPR). Make sure DET actually is
3871 * cleared.
3872 */
3873 do {
3874 scontrol = (scontrol & 0x0f0) | 0x300;
3875 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3876 return rc;
3877 /*
3878 * Some PHYs react badly if SStatus is pounded
3879 * immediately after resuming. Delay 200ms before
3880 * debouncing.
3881 */
3882 if (!(link->flags & ATA_LFLAG_NO_DB_DELAY))
3883 ata_msleep(link->ap, 200);
3884
3885 /* is SControl restored correctly? */
3886 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3887 return rc;
3888 } while ((scontrol & 0xf0f) != 0x300 && --tries);
3889
3890 if ((scontrol & 0xf0f) != 0x300) {
3891 ata_link_warn(link, "failed to resume link (SControl %X)\n",
3892 scontrol);
3893 return 0;
3894 }
3895
3896 if (tries < ATA_LINK_RESUME_TRIES)
3897 ata_link_warn(link, "link resume succeeded after %d retries\n",
3898 ATA_LINK_RESUME_TRIES - tries);
3899
3900 if ((rc = sata_link_debounce(link, params, deadline)))
3901 return rc;
3902
3903 /* clear SError, some PHYs require this even for SRST to work */
3904 if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
3905 rc = sata_scr_write(link, SCR_ERROR, serror);
3906
3907 return rc != -EINVAL ? rc : 0;
3908 }
3909
3910 /**
3911 * sata_link_scr_lpm - manipulate SControl IPM and SPM fields
3912 * @link: ATA link to manipulate SControl for
3913 * @policy: LPM policy to configure
3914 * @spm_wakeup: initiate LPM transition to active state
3915 *
3916 * Manipulate the IPM field of the SControl register of @link
3917 * according to @policy. If @policy is ATA_LPM_MAX_POWER and
3918 * @spm_wakeup is %true, the SPM field is manipulated to wake up
3919 * the link. This function also clears PHYRDY_CHG before
3920 * returning.
3921 *
3922 * LOCKING:
3923 * EH context.
3924 *
3925 * RETURNS:
3926 * 0 on success, -errno otherwise.
3927 */
3928 int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
3929 bool spm_wakeup)
3930 {
3931 struct ata_eh_context *ehc = &link->eh_context;
3932 bool woken_up = false;
3933 u32 scontrol;
3934 int rc;
3935
3936 rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
3937 if (rc)
3938 return rc;
3939
3940 switch (policy) {
3941 case ATA_LPM_MAX_POWER:
3942 /* disable all LPM transitions */
3943 scontrol |= (0x7 << 8);
3944 /* initiate transition to active state */
3945 if (spm_wakeup) {
3946 scontrol |= (0x4 << 12);
3947 woken_up = true;
3948 }
3949 break;
3950 case ATA_LPM_MED_POWER:
3951 /* allow LPM to PARTIAL */
3952 scontrol &= ~(0x1 << 8);
3953 scontrol |= (0x6 << 8);
3954 break;
3955 case ATA_LPM_MED_POWER_WITH_DIPM:
3956 case ATA_LPM_MIN_POWER_WITH_PARTIAL:
3957 case ATA_LPM_MIN_POWER:
3958 if (ata_link_nr_enabled(link) > 0)
3959 /* no restrictions on LPM transitions */
3960 scontrol &= ~(0x7 << 8);
3961 else {
3962 /* empty port, power off */
3963 scontrol &= ~0xf;
3964 scontrol |= (0x1 << 2);
3965 }
3966 break;
3967 default:
3968 WARN_ON(1);
3969 }
3970
3971 rc = sata_scr_write(link, SCR_CONTROL, scontrol);
3972 if (rc)
3973 return rc;
3974
3975 /* give the link time to transit out of LPM state */
3976 if (woken_up)
3977 msleep(10);
3978
3979 /* clear PHYRDY_CHG from SError */
3980 ehc->i.serror &= ~SERR_PHYRDY_CHG;
3981 return sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
3982 }
3983
3984 /**
3985 * ata_std_prereset - prepare for reset
3986 * @link: ATA link to be reset
3987 * @deadline: deadline jiffies for the operation
3988 *
3989 * @link is about to be reset. Initialize it. Failure from
3990 * prereset makes libata abort whole reset sequence and give up
3991 * that port, so prereset should be best-effort. It does its
3992 * best to prepare for reset sequence but if things go wrong, it
3993 * should just whine, not fail.
3994 *
3995 * LOCKING:
3996 * Kernel thread context (may sleep)
3997 *
3998 * RETURNS:
3999 * 0 on success, -errno otherwise.
4000 */
4001 int ata_std_prereset(struct ata_link *link, unsigned long deadline)
4002 {
4003 struct ata_port *ap = link->ap;
4004 struct ata_eh_context *ehc = &link->eh_context;
4005 const unsigned long *timing = sata_ehc_deb_timing(ehc);
4006 int rc;
4007
4008 /* if we're about to do hardreset, nothing more to do */
4009 if (ehc->i.action & ATA_EH_HARDRESET)
4010 return 0;
4011
4012 /* if SATA, resume link */
4013 if (ap->flags & ATA_FLAG_SATA) {
4014 rc = sata_link_resume(link, timing, deadline);
4015 /* whine about phy resume failure but proceed */
4016 if (rc && rc != -EOPNOTSUPP)
4017 ata_link_warn(link,
4018 "failed to resume link for reset (errno=%d)\n",
4019 rc);
4020 }
4021
4022 /* no point in trying softreset on offline link */
4023 if (ata_phys_link_offline(link))
4024 ehc->i.action &= ~ATA_EH_SOFTRESET;
4025
4026 return 0;
4027 }
4028
4029 /**
4030 * sata_link_hardreset - reset link via SATA phy reset
4031 * @link: link to reset
4032 * @timing: timing parameters { interval, duration, timeout } in msec
4033 * @deadline: deadline jiffies for the operation
4034 * @online: optional out parameter indicating link onlineness
4035 * @check_ready: optional callback to check link readiness
4036 *
4037 * SATA phy-reset @link using DET bits of SControl register.
4038 * After hardreset, link readiness is waited upon using
4039 * ata_wait_ready() if @check_ready is specified. LLDs are
4040 * allowed to not specify @check_ready and wait itself after this
4041 * function returns. Device classification is LLD's
4042 * responsibility.
4043 *
4044 * *@online is set to one iff reset succeeded and @link is online
4045 * after reset.
4046 *
4047 * LOCKING:
4048 * Kernel thread context (may sleep)
4049 *
4050 * RETURNS:
4051 * 0 on success, -errno otherwise.
4052 */
4053 int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
4054 unsigned long deadline,
4055 bool *online, int (*check_ready)(struct ata_link *))
4056 {
4057 u32 scontrol;
4058 int rc;
4059
4060 DPRINTK("ENTER\n");
4061
4062 if (online)
4063 *online = false;
4064
4065 if (sata_set_spd_needed(link)) {
4066 /* SATA spec says nothing about how to reconfigure
4067 * spd. To be on the safe side, turn off phy during
4068 * reconfiguration. This works for at least ICH7 AHCI
4069 * and Sil3124.
4070 */
4071 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
4072 goto out;
4073
4074 scontrol = (scontrol & 0x0f0) | 0x304;
4075
4076 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
4077 goto out;
4078
4079 sata_set_spd(link);
4080 }
4081
4082 /* issue phy wake/reset */
4083 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
4084 goto out;
4085
4086 scontrol = (scontrol & 0x0f0) | 0x301;
4087
4088 if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
4089 goto out;
4090
4091 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
4092 * 10.4.2 says at least 1 ms.
4093 */
4094 ata_msleep(link->ap, 1);
4095
4096 /* bring link back */
4097 rc = sata_link_resume(link, timing, deadline);
4098 if (rc)
4099 goto out;
4100 /* if link is offline nothing more to do */
4101 if (ata_phys_link_offline(link))
4102 goto out;
4103
4104 /* Link is online. From this point, -ENODEV too is an error. */
4105 if (online)
4106 *online = true;
4107
4108 if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
4109 /* If PMP is supported, we have to do follow-up SRST.
4110 * Some PMPs don't send D2H Reg FIS after hardreset if
4111 * the first port is empty. Wait only for
4112 * ATA_TMOUT_PMP_SRST_WAIT.
4113 */
4114 if (check_ready) {
4115 unsigned long pmp_deadline;
4116
4117 pmp_deadline = ata_deadline(jiffies,
4118 ATA_TMOUT_PMP_SRST_WAIT);
4119 if (time_after(pmp_deadline, deadline))
4120 pmp_deadline = deadline;
4121 ata_wait_ready(link, pmp_deadline, check_ready);
4122 }
4123 rc = -EAGAIN;
4124 goto out;
4125 }
4126
4127 rc = 0;
4128 if (check_ready)
4129 rc = ata_wait_ready(link, deadline, check_ready);
4130 out:
4131 if (rc && rc != -EAGAIN) {
4132 /* online is set iff link is online && reset succeeded */
4133 if (online)
4134 *online = false;
4135 ata_link_err(link, "COMRESET failed (errno=%d)\n", rc);
4136 }
4137 DPRINTK("EXIT, rc=%d\n", rc);
4138 return rc;
4139 }
4140
4141 /**
4142 * sata_std_hardreset - COMRESET w/o waiting or classification
4143 * @link: link to reset
4144 * @class: resulting class of attached device
4145 * @deadline: deadline jiffies for the operation
4146 *
4147 * Standard SATA COMRESET w/o waiting or classification.
4148 *
4149 * LOCKING:
4150 * Kernel thread context (may sleep)
4151 *
4152 * RETURNS:
4153 * 0 if link offline, -EAGAIN if link online, -errno on errors.
4154 */
4155 int sata_std_hardreset(struct ata_link *link, unsigned int *class,
4156 unsigned long deadline)
4157 {
4158 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
4159 bool online;
4160 int rc;
4161
4162 /* do hardreset */
4163 rc = sata_link_hardreset(link, timing, deadline, &online, NULL);
4164 return online ? -EAGAIN : rc;
4165 }
4166
4167 /**
4168 * ata_std_postreset - standard postreset callback
4169 * @link: the target ata_link
4170 * @classes: classes of attached devices
4171 *
4172 * This function is invoked after a successful reset. Note that
4173 * the device might have been reset more than once using
4174 * different reset methods before postreset is invoked.
4175 *
4176 * LOCKING:
4177 * Kernel thread context (may sleep)
4178 */
4179 void ata_std_postreset(struct ata_link *link, unsigned int *classes)
4180 {
4181 u32 serror;
4182
4183 DPRINTK("ENTER\n");
4184
4185 /* reset complete, clear SError */
4186 if (!sata_scr_read(link, SCR_ERROR, &serror))
4187 sata_scr_write(link, SCR_ERROR, serror);
4188
4189 /* print link status */
4190 sata_print_link_status(link);
4191
4192 DPRINTK("EXIT\n");
4193 }
4194
4195 /**
4196 * ata_dev_same_device - Determine whether new ID matches configured device
4197 * @dev: device to compare against
4198 * @new_class: class of the new device
4199 * @new_id: IDENTIFY page of the new device
4200 *
4201 * Compare @new_class and @new_id against @dev and determine
4202 * whether @dev is the device indicated by @new_class and
4203 * @new_id.
4204 *
4205 * LOCKING:
4206 * None.
4207 *
4208 * RETURNS:
4209 * 1 if @dev matches @new_class and @new_id, 0 otherwise.
4210 */
4211 static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
4212 const u16 *new_id)
4213 {
4214 const u16 *old_id = dev->id;
4215 unsigned char model[2][ATA_ID_PROD_LEN + 1];
4216 unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
4217
4218 if (dev->class != new_class) {
4219 ata_dev_info(dev, "class mismatch %d != %d\n",
4220 dev->class, new_class);
4221 return 0;
4222 }
4223
4224 ata_id_c_string(old_id, model[0], ATA_ID_PROD, sizeof(model[0]));
4225 ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1]));
4226 ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0]));
4227 ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1]));
4228
4229 if (strcmp(model[0], model[1])) {
4230 ata_dev_info(dev, "model number mismatch '%s' != '%s'\n",
4231 model[0], model[1]);
4232 return 0;
4233 }
4234
4235 if (strcmp(serial[0], serial[1])) {
4236 ata_dev_info(dev, "serial number mismatch '%s' != '%s'\n",
4237 serial[0], serial[1]);
4238 return 0;
4239 }
4240
4241 return 1;
4242 }
4243
4244 /**
4245 * ata_dev_reread_id - Re-read IDENTIFY data
4246 * @dev: target ATA device
4247 * @readid_flags: read ID flags
4248 *
4249 * Re-read IDENTIFY page and make sure @dev is still attached to
4250 * the port.
4251 *
4252 * LOCKING:
4253 * Kernel thread context (may sleep)
4254 *
4255 * RETURNS:
4256 * 0 on success, negative errno otherwise
4257 */
4258 int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
4259 {
4260 unsigned int class = dev->class;
4261 u16 *id = (void *)dev->link->ap->sector_buf;
4262 int rc;
4263
4264 /* read ID data */
4265 rc = ata_dev_read_id(dev, &class, readid_flags, id);
4266 if (rc)
4267 return rc;
4268
4269 /* is the device still there? */
4270 if (!ata_dev_same_device(dev, class, id))
4271 return -ENODEV;
4272
4273 memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
4274 return 0;
4275 }
4276
4277 /**
4278 * ata_dev_revalidate - Revalidate ATA device
4279 * @dev: device to revalidate
4280 * @new_class: new class code
4281 * @readid_flags: read ID flags
4282 *
4283 * Re-read IDENTIFY page, make sure @dev is still attached to the
4284 * port and reconfigure it according to the new IDENTIFY page.
4285 *
4286 * LOCKING:
4287 * Kernel thread context (may sleep)
4288 *
4289 * RETURNS:
4290 * 0 on success, negative errno otherwise
4291 */
4292 int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
4293 unsigned int readid_flags)
4294 {
4295 u64 n_sectors = dev->n_sectors;
4296 u64 n_native_sectors = dev->n_native_sectors;
4297 int rc;
4298
4299 if (!ata_dev_enabled(dev))
4300 return -ENODEV;
4301
4302 /* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
4303 if (ata_class_enabled(new_class) &&
4304 new_class != ATA_DEV_ATA &&
4305 new_class != ATA_DEV_ATAPI &&
4306 new_class != ATA_DEV_ZAC &&
4307 new_class != ATA_DEV_SEMB) {
4308 ata_dev_info(dev, "class mismatch %u != %u\n",
4309 dev->class, new_class);
4310 rc = -ENODEV;
4311 goto fail;
4312 }
4313
4314 /* re-read ID */
4315 rc = ata_dev_reread_id(dev, readid_flags);
4316 if (rc)
4317 goto fail;
4318
4319 /* configure device according to the new ID */
4320 rc = ata_dev_configure(dev);
4321 if (rc)
4322 goto fail;
4323
4324 /* verify n_sectors hasn't changed */
4325 if (dev->class != ATA_DEV_ATA || !n_sectors ||
4326 dev->n_sectors == n_sectors)
4327 return 0;
4328
4329 /* n_sectors has changed */
4330 ata_dev_warn(dev, "n_sectors mismatch %llu != %llu\n",
4331 (unsigned long long)n_sectors,
4332 (unsigned long long)dev->n_sectors);
4333
4334 /*
4335 * Something could have caused HPA to be unlocked
4336 * involuntarily. If n_native_sectors hasn't changed and the
4337 * new size matches it, keep the device.
4338 */
4339 if (dev->n_native_sectors == n_native_sectors &&
4340 dev->n_sectors > n_sectors && dev->n_sectors == n_native_sectors) {
4341 ata_dev_warn(dev,
4342 "new n_sectors matches native, probably "
4343 "late HPA unlock, n_sectors updated\n");
4344 /* use the larger n_sectors */
4345 return 0;
4346 }
4347
4348 /*
4349 * Some BIOSes boot w/o HPA but resume w/ HPA locked. Try
4350 * unlocking HPA in those cases.
4351 *
4352 * https://bugzilla.kernel.org/show_bug.cgi?id=15396
4353 */
4354 if (dev->n_native_sectors == n_native_sectors &&
4355 dev->n_sectors < n_sectors && n_sectors == n_native_sectors &&
4356 !(dev->horkage & ATA_HORKAGE_BROKEN_HPA)) {
4357 ata_dev_warn(dev,
4358 "old n_sectors matches native, probably "
4359 "late HPA lock, will try to unlock HPA\n");
4360 /* try unlocking HPA */
4361 dev->flags |= ATA_DFLAG_UNLOCK_HPA;
4362 rc = -EIO;
4363 } else
4364 rc = -ENODEV;
4365
4366 /* restore original n_[native_]sectors and fail */
4367 dev->n_native_sectors = n_native_sectors;
4368 dev->n_sectors = n_sectors;
4369 fail:
4370 ata_dev_err(dev, "revalidation failed (errno=%d)\n", rc);
4371 return rc;
4372 }
4373
4374 struct ata_blacklist_entry {
4375 const char *model_num;
4376 const char *model_rev;
4377 unsigned long horkage;
4378 };
4379
4380 static const struct ata_blacklist_entry ata_device_blacklist [] = {
4381 /* Devices with DMA related problems under Linux */
4382 { "WDC AC11000H", NULL, ATA_HORKAGE_NODMA },
4383 { "WDC AC22100H", NULL, ATA_HORKAGE_NODMA },
4384 { "WDC AC32500H", NULL, ATA_HORKAGE_NODMA },
4385 { "WDC AC33100H", NULL, ATA_HORKAGE_NODMA },
4386 { "WDC AC31600H", NULL, ATA_HORKAGE_NODMA },
4387 { "WDC AC32100H", "24.09P07", ATA_HORKAGE_NODMA },
4388 { "WDC AC23200L", "21.10N21", ATA_HORKAGE_NODMA },
4389 { "Compaq CRD-8241B", NULL, ATA_HORKAGE_NODMA },
4390 { "CRD-8400B", NULL, ATA_HORKAGE_NODMA },
4391 { "CRD-848[02]B", NULL, ATA_HORKAGE_NODMA },
4392 { "CRD-84", NULL, ATA_HORKAGE_NODMA },
4393 { "SanDisk SDP3B", NULL, ATA_HORKAGE_NODMA },
4394 { "SanDisk SDP3B-64", NULL, ATA_HORKAGE_NODMA },
4395 { "SANYO CD-ROM CRD", NULL, ATA_HORKAGE_NODMA },
4396 { "HITACHI CDR-8", NULL, ATA_HORKAGE_NODMA },
4397 { "HITACHI CDR-8[34]35",NULL, ATA_HORKAGE_NODMA },
4398 { "Toshiba CD-ROM XM-6202B", NULL, ATA_HORKAGE_NODMA },
4399 { "TOSHIBA CD-ROM XM-1702BC", NULL, ATA_HORKAGE_NODMA },
4400 { "CD-532E-A", NULL, ATA_HORKAGE_NODMA },
4401 { "E-IDE CD-ROM CR-840",NULL, ATA_HORKAGE_NODMA },
4402 { "CD-ROM Drive/F5A", NULL, ATA_HORKAGE_NODMA },
4403 { "WPI CDD-820", NULL, ATA_HORKAGE_NODMA },
4404 { "SAMSUNG CD-ROM SC-148C", NULL, ATA_HORKAGE_NODMA },
4405 { "SAMSUNG CD-ROM SC", NULL, ATA_HORKAGE_NODMA },
4406 { "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
4407 { "_NEC DV5800A", NULL, ATA_HORKAGE_NODMA },
4408 { "SAMSUNG CD-ROM SN-124", "N001", ATA_HORKAGE_NODMA },
4409 { "Seagate STT20000A", NULL, ATA_HORKAGE_NODMA },
4410 { " 2GB ATA Flash Disk", "ADMA428M", ATA_HORKAGE_NODMA },
4411 { "VRFDFC22048UCHC-TE*", NULL, ATA_HORKAGE_NODMA },
4412 /* Odd clown on sil3726/4726 PMPs */
4413 { "Config Disk", NULL, ATA_HORKAGE_DISABLE },
4414
4415 /* Weird ATAPI devices */
4416 { "TORiSAN DVD-ROM DRD-N216", NULL, ATA_HORKAGE_MAX_SEC_128 },
4417 { "QUANTUM DAT DAT72-000", NULL, ATA_HORKAGE_ATAPI_MOD16_DMA },
4418 { "Slimtype DVD A DS8A8SH", NULL, ATA_HORKAGE_MAX_SEC_LBA48 },
4419 { "Slimtype DVD A DS8A9SH", NULL, ATA_HORKAGE_MAX_SEC_LBA48 },
4420
4421 /*
4422 * Causes silent data corruption with higher max sects.
4423 * http://lkml.kernel.org/g/x49wpy40ysk.fsf@segfault.boston.devel.redhat.com
4424 */
4425 { "ST380013AS", "3.20", ATA_HORKAGE_MAX_SEC_1024 },
4426
4427 /*
4428 * These devices time out with higher max sects.
4429 * https://bugzilla.kernel.org/show_bug.cgi?id=121671
4430 */
4431 { "LITEON CX1-JB*-HP", NULL, ATA_HORKAGE_MAX_SEC_1024 },
4432 { "LITEON EP1-*", NULL, ATA_HORKAGE_MAX_SEC_1024 },
4433
4434 /* Devices we expect to fail diagnostics */
4435
4436 /* Devices where NCQ should be avoided */
4437 /* NCQ is slow */
4438 { "WDC WD740ADFD-00", NULL, ATA_HORKAGE_NONCQ },
4439 { "WDC WD740ADFD-00NLR1", NULL, ATA_HORKAGE_NONCQ, },
4440 /* http://thread.gmane.org/gmane.linux.ide/14907 */
4441 { "FUJITSU MHT2060BH", NULL, ATA_HORKAGE_NONCQ },
4442 /* NCQ is broken */
4443 { "Maxtor *", "BANC*", ATA_HORKAGE_NONCQ },
4444 { "Maxtor 7V300F0", "VA111630", ATA_HORKAGE_NONCQ },
4445 { "ST380817AS", "3.42", ATA_HORKAGE_NONCQ },
4446 { "ST3160023AS", "3.42", ATA_HORKAGE_NONCQ },
4447 { "OCZ CORE_SSD", "02.10104", ATA_HORKAGE_NONCQ },
4448
4449 /* Seagate NCQ + FLUSH CACHE firmware bug */
4450 { "ST31500341AS", "SD1[5-9]", ATA_HORKAGE_NONCQ |
4451 ATA_HORKAGE_FIRMWARE_WARN },
4452
4453 { "ST31000333AS", "SD1[5-9]", ATA_HORKAGE_NONCQ |
4454 ATA_HORKAGE_FIRMWARE_WARN },
4455
4456 { "ST3640[36]23AS", "SD1[5-9]", ATA_HORKAGE_NONCQ |
4457 ATA_HORKAGE_FIRMWARE_WARN },
4458
4459 { "ST3320[68]13AS", "SD1[5-9]", ATA_HORKAGE_NONCQ |
4460 ATA_HORKAGE_FIRMWARE_WARN },
4461
4462 /* drives which fail FPDMA_AA activation (some may freeze afterwards)
4463 the ST disks also have LPM issues */
4464 { "ST1000LM024 HN-M101MBB", NULL, ATA_HORKAGE_BROKEN_FPDMA_AA |
4465 ATA_HORKAGE_NOLPM, },
4466 { "VB0250EAVER", "HPG7", ATA_HORKAGE_BROKEN_FPDMA_AA },
4467
4468 /* Blacklist entries taken from Silicon Image 3124/3132
4469 Windows driver .inf file - also several Linux problem reports */
4470 { "HTS541060G9SA00", "MB3OC60D", ATA_HORKAGE_NONCQ, },
4471 { "HTS541080G9SA00", "MB4OC60D", ATA_HORKAGE_NONCQ, },
4472 { "HTS541010G9SA00", "MBZOC60D", ATA_HORKAGE_NONCQ, },
4473
4474 /* https://bugzilla.kernel.org/show_bug.cgi?id=15573 */
4475 { "C300-CTFDDAC128MAG", "0001", ATA_HORKAGE_NONCQ, },
4476
4477 /* Sandisk SD7/8/9s lock up hard on large trims */
4478 { "SanDisk SD[789]*", NULL, ATA_HORKAGE_MAX_TRIM_128M, },
4479
4480 /* devices which puke on READ_NATIVE_MAX */
4481 { "HDS724040KLSA80", "KFAOA20N", ATA_HORKAGE_BROKEN_HPA, },
4482 { "WDC WD3200JD-00KLB0", "WD-WCAMR1130137", ATA_HORKAGE_BROKEN_HPA },
4483 { "WDC WD2500JD-00HBB0", "WD-WMAL71490727", ATA_HORKAGE_BROKEN_HPA },
4484 { "MAXTOR 6L080L4", "A93.0500", ATA_HORKAGE_BROKEN_HPA },
4485
4486 /* this one allows HPA unlocking but fails IOs on the area */
4487 { "OCZ-VERTEX", "1.30", ATA_HORKAGE_BROKEN_HPA },
4488
4489 /* Devices which report 1 sector over size HPA */
4490 { "ST340823A", NULL, ATA_HORKAGE_HPA_SIZE, },
4491 { "ST320413A", NULL, ATA_HORKAGE_HPA_SIZE, },
4492 { "ST310211A", NULL, ATA_HORKAGE_HPA_SIZE, },
4493
4494 /* Devices which get the IVB wrong */
4495 { "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
4496 /* Maybe we should just blacklist TSSTcorp... */
4497 { "TSSTcorp CDDVDW SH-S202[HJN]", "SB0[01]", ATA_HORKAGE_IVB, },
4498
4499 /* Devices that do not need bridging limits applied */
4500 { "MTRON MSP-SATA*", NULL, ATA_HORKAGE_BRIDGE_OK, },
4501 { "BUFFALO HD-QSU2/R5", NULL, ATA_HORKAGE_BRIDGE_OK, },
4502
4503 /* Devices which aren't very happy with higher link speeds */
4504 { "WD My Book", NULL, ATA_HORKAGE_1_5_GBPS, },
4505 { "Seagate FreeAgent GoFlex", NULL, ATA_HORKAGE_1_5_GBPS, },
4506
4507 /*
4508 * Devices which choke on SETXFER. Applies only if both the
4509 * device and controller are SATA.
4510 */
4511 { "PIONEER DVD-RW DVRTD08", NULL, ATA_HORKAGE_NOSETXFER },
4512 { "PIONEER DVD-RW DVRTD08A", NULL, ATA_HORKAGE_NOSETXFER },
4513 { "PIONEER DVD-RW DVR-215", NULL, ATA_HORKAGE_NOSETXFER },
4514 { "PIONEER DVD-RW DVR-212D", NULL, ATA_HORKAGE_NOSETXFER },
4515 { "PIONEER DVD-RW DVR-216D", NULL, ATA_HORKAGE_NOSETXFER },
4516
4517 /* Crucial BX100 SSD 500GB has broken LPM support */
4518 { "CT500BX100SSD1", NULL, ATA_HORKAGE_NOLPM },
4519
4520 /* 512GB MX100 with MU01 firmware has both queued TRIM and LPM issues */
4521 { "Crucial_CT512MX100*", "MU01", ATA_HORKAGE_NO_NCQ_TRIM |
4522 ATA_HORKAGE_ZERO_AFTER_TRIM |
4523 ATA_HORKAGE_NOLPM, },
4524 /* 512GB MX100 with newer firmware has only LPM issues */
4525 { "Crucial_CT512MX100*", NULL, ATA_HORKAGE_ZERO_AFTER_TRIM |
4526 ATA_HORKAGE_NOLPM, },
4527
4528 /* 480GB+ M500 SSDs have both queued TRIM and LPM issues */
4529 { "Crucial_CT480M500*", NULL, ATA_HORKAGE_NO_NCQ_TRIM |
4530 ATA_HORKAGE_ZERO_AFTER_TRIM |
4531 ATA_HORKAGE_NOLPM, },
4532 { "Crucial_CT960M500*", NULL, ATA_HORKAGE_NO_NCQ_TRIM |
4533 ATA_HORKAGE_ZERO_AFTER_TRIM |
4534 ATA_HORKAGE_NOLPM, },
4535
4536 /* These specific Samsung models/firmware-revs do not handle LPM well */
4537 { "SAMSUNG MZMPC128HBFU-000MV", "CXM14M1Q", ATA_HORKAGE_NOLPM, },
4538 { "SAMSUNG SSD PM830 mSATA *", "CXM13D1Q", ATA_HORKAGE_NOLPM, },
4539 { "SAMSUNG MZ7TD256HAFV-000L9", NULL, ATA_HORKAGE_NOLPM, },
4540 { "SAMSUNG MZ7TE512HMHP-000L1", "EXT06L0Q", ATA_HORKAGE_NOLPM, },
4541
4542 /* devices that don't properly handle queued TRIM commands */
4543 { "Micron_M500IT_*", "MU01", ATA_HORKAGE_NO_NCQ_TRIM |
4544 ATA_HORKAGE_ZERO_AFTER_TRIM, },
4545 { "Micron_M500_*", NULL, ATA_HORKAGE_NO_NCQ_TRIM |
4546 ATA_HORKAGE_ZERO_AFTER_TRIM, },
4547 { "Crucial_CT*M500*", NULL, ATA_HORKAGE_NO_NCQ_TRIM |
4548 ATA_HORKAGE_ZERO_AFTER_TRIM, },
4549 { "Micron_M5[15]0_*", "MU01", ATA_HORKAGE_NO_NCQ_TRIM |
4550 ATA_HORKAGE_ZERO_AFTER_TRIM, },
4551 { "Crucial_CT*M550*", "MU01", ATA_HORKAGE_NO_NCQ_TRIM |
4552 ATA_HORKAGE_ZERO_AFTER_TRIM, },
4553 { "Crucial_CT*MX100*", "MU01", ATA_HORKAGE_NO_NCQ_TRIM |
4554 ATA_HORKAGE_ZERO_AFTER_TRIM, },
4555 { "Samsung SSD 840*", NULL, ATA_HORKAGE_NO_NCQ_TRIM |
4556 ATA_HORKAGE_ZERO_AFTER_TRIM, },
4557 { "Samsung SSD 850*", NULL, ATA_HORKAGE_NO_NCQ_TRIM |
4558 ATA_HORKAGE_ZERO_AFTER_TRIM, },
4559 { "FCCT*M500*", NULL, ATA_HORKAGE_NO_NCQ_TRIM |
4560 ATA_HORKAGE_ZERO_AFTER_TRIM, },
4561
4562 /* devices that don't properly handle TRIM commands */
4563 { "SuperSSpeed S238*", NULL, ATA_HORKAGE_NOTRIM, },
4564
4565 /*
4566 * As defined, the DRAT (Deterministic Read After Trim) and RZAT
4567 * (Return Zero After Trim) flags in the ATA Command Set are
4568 * unreliable in the sense that they only define what happens if
4569 * the device successfully executed the DSM TRIM command. TRIM
4570 * is only advisory, however, and the device is free to silently
4571 * ignore all or parts of the request.
4572 *
4573 * Whitelist drives that are known to reliably return zeroes
4574 * after TRIM.
4575 */
4576
4577 /*
4578 * The intel 510 drive has buggy DRAT/RZAT. Explicitly exclude
4579 * that model before whitelisting all other intel SSDs.
4580 */
4581 { "INTEL*SSDSC2MH*", NULL, 0, },
4582
4583 { "Micron*", NULL, ATA_HORKAGE_ZERO_AFTER_TRIM, },
4584 { "Crucial*", NULL, ATA_HORKAGE_ZERO_AFTER_TRIM, },
4585 { "INTEL*SSD*", NULL, ATA_HORKAGE_ZERO_AFTER_TRIM, },
4586 { "SSD*INTEL*", NULL, ATA_HORKAGE_ZERO_AFTER_TRIM, },
4587 { "Samsung*SSD*", NULL, ATA_HORKAGE_ZERO_AFTER_TRIM, },
4588 { "SAMSUNG*SSD*", NULL, ATA_HORKAGE_ZERO_AFTER_TRIM, },
4589 { "SAMSUNG*MZ7KM*", NULL, ATA_HORKAGE_ZERO_AFTER_TRIM, },
4590 { "ST[1248][0248]0[FH]*", NULL, ATA_HORKAGE_ZERO_AFTER_TRIM, },
4591
4592 /*
4593 * Some WD SATA-I drives spin up and down erratically when the link
4594 * is put into the slumber mode. We don't have full list of the
4595 * affected devices. Disable LPM if the device matches one of the
4596 * known prefixes and is SATA-1. As a side effect LPM partial is
4597 * lost too.
4598 *
4599 * https://bugzilla.kernel.org/show_bug.cgi?id=57211
4600 */
4601 { "WDC WD800JD-*", NULL, ATA_HORKAGE_WD_BROKEN_LPM },
4602 { "WDC WD1200JD-*", NULL, ATA_HORKAGE_WD_BROKEN_LPM },
4603 { "WDC WD1600JD-*", NULL, ATA_HORKAGE_WD_BROKEN_LPM },
4604 { "WDC WD2000JD-*", NULL, ATA_HORKAGE_WD_BROKEN_LPM },
4605 { "WDC WD2500JD-*", NULL, ATA_HORKAGE_WD_BROKEN_LPM },
4606 { "WDC WD3000JD-*", NULL, ATA_HORKAGE_WD_BROKEN_LPM },
4607 { "WDC WD3200JD-*", NULL, ATA_HORKAGE_WD_BROKEN_LPM },
4608
4609 /* End Marker */
4610 { }
4611 };
4612
4613 static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
4614 {
4615 unsigned char model_num[ATA_ID_PROD_LEN + 1];
4616 unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4617 const struct ata_blacklist_entry *ad = ata_device_blacklist;
4618
4619 ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
4620 ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
4621
4622 while (ad->model_num) {
4623 if (glob_match(ad->model_num, model_num)) {
4624 if (ad->model_rev == NULL)
4625 return ad->horkage;
4626 if (glob_match(ad->model_rev, model_rev))
4627 return ad->horkage;
4628 }
4629 ad++;
4630 }
4631 return 0;
4632 }
4633
4634 static int ata_dma_blacklisted(const struct ata_device *dev)
4635 {
4636 /* We don't support polling DMA.
4637 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
4638 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
4639 */
4640 if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4641 (dev->flags & ATA_DFLAG_CDB_INTR))
4642 return 1;
4643 return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4644 }
4645
4646 /**
4647 * ata_is_40wire - check drive side detection
4648 * @dev: device
4649 *
4650 * Perform drive side detection decoding, allowing for device vendors
4651 * who can't follow the documentation.
4652 */
4653
4654 static int ata_is_40wire(struct ata_device *dev)
4655 {
4656 if (dev->horkage & ATA_HORKAGE_IVB)
4657 return ata_drive_40wire_relaxed(dev->id);
4658 return ata_drive_40wire(dev->id);
4659 }
4660
4661 /**
4662 * cable_is_40wire - 40/80/SATA decider
4663 * @ap: port to consider
4664 *
4665 * This function encapsulates the policy for speed management
4666 * in one place. At the moment we don't cache the result but
4667 * there is a good case for setting ap->cbl to the result when
4668 * we are called with unknown cables (and figuring out if it
4669 * impacts hotplug at all).
4670 *
4671 * Return 1 if the cable appears to be 40 wire.
4672 */
4673
4674 static int cable_is_40wire(struct ata_port *ap)
4675 {
4676 struct ata_link *link;
4677 struct ata_device *dev;
4678
4679 /* If the controller thinks we are 40 wire, we are. */
4680 if (ap->cbl == ATA_CBL_PATA40)
4681 return 1;
4682
4683 /* If the controller thinks we are 80 wire, we are. */
4684 if (ap->cbl == ATA_CBL_PATA80 || ap->cbl == ATA_CBL_SATA)
4685 return 0;
4686
4687 /* If the system is known to be 40 wire short cable (eg
4688 * laptop), then we allow 80 wire modes even if the drive
4689 * isn't sure.
4690 */
4691 if (ap->cbl == ATA_CBL_PATA40_SHORT)
4692 return 0;
4693
4694 /* If the controller doesn't know, we scan.
4695 *
4696 * Note: We look for all 40 wire detects at this point. Any
4697 * 80 wire detect is taken to be 80 wire cable because
4698 * - in many setups only the one drive (slave if present) will
4699 * give a valid detect
4700 * - if you have a non detect capable drive you don't want it
4701 * to colour the choice
4702 */
4703 ata_for_each_link(link, ap, EDGE) {
4704 ata_for_each_dev(dev, link, ENABLED) {
4705 if (!ata_is_40wire(dev))
4706 return 0;
4707 }
4708 }
4709 return 1;
4710 }
4711
4712 /**
4713 * ata_dev_xfermask - Compute supported xfermask of the given device
4714 * @dev: Device to compute xfermask for
4715 *
4716 * Compute supported xfermask of @dev and store it in
4717 * dev->*_mask. This function is responsible for applying all
4718 * known limits including host controller limits, device
4719 * blacklist, etc...
4720 *
4721 * LOCKING:
4722 * None.
4723 */
4724 static void ata_dev_xfermask(struct ata_device *dev)
4725 {
4726 struct ata_link *link = dev->link;
4727 struct ata_port *ap = link->ap;
4728 struct ata_host *host = ap->host;
4729 unsigned long xfer_mask;
4730
4731 /* controller modes available */
4732 xfer_mask = ata_pack_xfermask(ap->pio_mask,
4733 ap->mwdma_mask, ap->udma_mask);
4734
4735 /* drive modes available */
4736 xfer_mask &= ata_pack_xfermask(dev->pio_mask,
4737 dev->mwdma_mask, dev->udma_mask);
4738 xfer_mask &= ata_id_xfermask(dev->id);
4739
4740 /*
4741 * CFA Advanced TrueIDE timings are not allowed on a shared
4742 * cable
4743 */
4744 if (ata_dev_pair(dev)) {
4745 /* No PIO5 or PIO6 */
4746 xfer_mask &= ~(0x03 << (ATA_SHIFT_PIO + 5));
4747 /* No MWDMA3 or MWDMA 4 */
4748 xfer_mask &= ~(0x03 << (ATA_SHIFT_MWDMA + 3));
4749 }
4750
4751 if (ata_dma_blacklisted(dev)) {
4752 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4753 ata_dev_warn(dev,
4754 "device is on DMA blacklist, disabling DMA\n");
4755 }
4756
4757 if ((host->flags & ATA_HOST_SIMPLEX) &&
4758 host->simplex_claimed && host->simplex_claimed != ap) {
4759 xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4760 ata_dev_warn(dev,
4761 "simplex DMA is claimed by other device, disabling DMA\n");
4762 }
4763
4764 if (ap->flags & ATA_FLAG_NO_IORDY)
4765 xfer_mask &= ata_pio_mask_no_iordy(dev);
4766
4767 if (ap->ops->mode_filter)
4768 xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4769
4770 /* Apply cable rule here. Don't apply it early because when
4771 * we handle hot plug the cable type can itself change.
4772 * Check this last so that we know if the transfer rate was
4773 * solely limited by the cable.
4774 * Unknown or 80 wire cables reported host side are checked
4775 * drive side as well. Cases where we know a 40wire cable
4776 * is used safely for 80 are not checked here.
4777 */
4778 if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
4779 /* UDMA/44 or higher would be available */
4780 if (cable_is_40wire(ap)) {
4781 ata_dev_warn(dev,
4782 "limited to UDMA/33 due to 40-wire cable\n");
4783 xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
4784 }
4785
4786 ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
4787 &dev->mwdma_mask, &dev->udma_mask);
4788 }
4789
4790 /**
4791 * ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
4792 * @dev: Device to which command will be sent
4793 *
4794 * Issue SET FEATURES - XFER MODE command to device @dev
4795 * on port @ap.
4796 *
4797 * LOCKING:
4798 * PCI/etc. bus probe sem.
4799 *
4800 * RETURNS:
4801 * 0 on success, AC_ERR_* mask otherwise.
4802 */
4803
4804 static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
4805 {
4806 struct ata_taskfile tf;
4807 unsigned int err_mask;
4808
4809 /* set up set-features taskfile */
4810 DPRINTK("set features - xfer mode\n");
4811
4812 /* Some controllers and ATAPI devices show flaky interrupt
4813 * behavior after setting xfer mode. Use polling instead.
4814 */
4815 ata_tf_init(dev, &tf);
4816 tf.command = ATA_CMD_SET_FEATURES;
4817 tf.feature = SETFEATURES_XFER;
4818 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4819 tf.protocol = ATA_PROT_NODATA;
4820 /* If we are using IORDY we must send the mode setting command */
4821 if (ata_pio_need_iordy(dev))
4822 tf.nsect = dev->xfer_mode;
4823 /* If the device has IORDY and the controller does not - turn it off */
4824 else if (ata_id_has_iordy(dev->id))
4825 tf.nsect = 0x01;
4826 else /* In the ancient relic department - skip all of this */
4827 return 0;
4828
4829 /* On some disks, this command causes spin-up, so we need longer timeout */
4830 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 15000);
4831
4832 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4833 return err_mask;
4834 }
4835
4836 /**
4837 * ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4838 * @dev: Device to which command will be sent
4839 * @enable: Whether to enable or disable the feature
4840 * @feature: The sector count represents the feature to set
4841 *
4842 * Issue SET FEATURES - SATA FEATURES command to device @dev
4843 * on port @ap with sector count
4844 *
4845 * LOCKING:
4846 * PCI/etc. bus probe sem.
4847 *
4848 * RETURNS:
4849 * 0 on success, AC_ERR_* mask otherwise.
4850 */
4851 unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable, u8 feature)
4852 {
4853 struct ata_taskfile tf;
4854 unsigned int err_mask;
4855 unsigned long timeout = 0;
4856
4857 /* set up set-features taskfile */
4858 DPRINTK("set features - SATA features\n");
4859
4860 ata_tf_init(dev, &tf);
4861 tf.command = ATA_CMD_SET_FEATURES;
4862 tf.feature = enable;
4863 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4864 tf.protocol = ATA_PROT_NODATA;
4865 tf.nsect = feature;
4866
4867 if (enable == SETFEATURES_SPINUP)
4868 timeout = ata_probe_timeout ?
4869 ata_probe_timeout * 1000 : SETFEATURES_SPINUP_TIMEOUT;
4870 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, timeout);
4871
4872 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4873 return err_mask;
4874 }
4875 EXPORT_SYMBOL_GPL(ata_dev_set_feature);
4876
4877 /**
4878 * ata_dev_init_params - Issue INIT DEV PARAMS command
4879 * @dev: Device to which command will be sent
4880 * @heads: Number of heads (taskfile parameter)
4881 * @sectors: Number of sectors (taskfile parameter)
4882 *
4883 * LOCKING:
4884 * Kernel thread context (may sleep)
4885 *
4886 * RETURNS:
4887 * 0 on success, AC_ERR_* mask otherwise.
4888 */
4889 static unsigned int ata_dev_init_params(struct ata_device *dev,
4890 u16 heads, u16 sectors)
4891 {
4892 struct ata_taskfile tf;
4893 unsigned int err_mask;
4894
4895 /* Number of sectors per track 1-255. Number of heads 1-16 */
4896 if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4897 return AC_ERR_INVALID;
4898
4899 /* set up init dev params taskfile */
4900 DPRINTK("init dev params \n");
4901
4902 ata_tf_init(dev, &tf);
4903 tf.command = ATA_CMD_INIT_DEV_PARAMS;
4904 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4905 tf.protocol = ATA_PROT_NODATA;
4906 tf.nsect = sectors;
4907 tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
4908
4909 err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4910 /* A clean abort indicates an original or just out of spec drive
4911 and we should continue as we issue the setup based on the
4912 drive reported working geometry */
4913 if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
4914 err_mask = 0;
4915
4916 DPRINTK("EXIT, err_mask=%x\n", err_mask);
4917 return err_mask;
4918 }
4919
4920 /**
4921 * atapi_check_dma - Check whether ATAPI DMA can be supported
4922 * @qc: Metadata associated with taskfile to check
4923 *
4924 * Allow low-level driver to filter ATA PACKET commands, returning
4925 * a status indicating whether or not it is OK to use DMA for the
4926 * supplied PACKET command.
4927 *
4928 * LOCKING:
4929 * spin_lock_irqsave(host lock)
4930 *
4931 * RETURNS: 0 when ATAPI DMA can be used
4932 * nonzero otherwise
4933 */
4934 int atapi_check_dma(struct ata_queued_cmd *qc)
4935 {
4936 struct ata_port *ap = qc->ap;
4937
4938 /* Don't allow DMA if it isn't multiple of 16 bytes. Quite a
4939 * few ATAPI devices choke on such DMA requests.
4940 */
4941 if (!(qc->dev->horkage & ATA_HORKAGE_ATAPI_MOD16_DMA) &&
4942 unlikely(qc->nbytes & 15))
4943 return 1;
4944
4945 if (ap->ops->check_atapi_dma)
4946 return ap->ops->check_atapi_dma(qc);
4947
4948 return 0;
4949 }
4950
4951 /**
4952 * ata_std_qc_defer - Check whether a qc needs to be deferred
4953 * @qc: ATA command in question
4954 *
4955 * Non-NCQ commands cannot run with any other command, NCQ or
4956 * not. As upper layer only knows the queue depth, we are
4957 * responsible for maintaining exclusion. This function checks
4958 * whether a new command @qc can be issued.
4959 *
4960 * LOCKING:
4961 * spin_lock_irqsave(host lock)
4962 *
4963 * RETURNS:
4964 * ATA_DEFER_* if deferring is needed, 0 otherwise.
4965 */
4966 int ata_std_qc_defer(struct ata_queued_cmd *qc)
4967 {
4968 struct ata_link *link = qc->dev->link;
4969
4970 if (ata_is_ncq(qc->tf.protocol)) {
4971 if (!ata_tag_valid(link->active_tag))
4972 return 0;
4973 } else {
4974 if (!ata_tag_valid(link->active_tag) && !link->sactive)
4975 return 0;
4976 }
4977
4978 return ATA_DEFER_LINK;
4979 }
4980
4981 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
4982
4983 /**
4984 * ata_sg_init - Associate command with scatter-gather table.
4985 * @qc: Command to be associated
4986 * @sg: Scatter-gather table.
4987 * @n_elem: Number of elements in s/g table.
4988 *
4989 * Initialize the data-related elements of queued_cmd @qc
4990 * to point to a scatter-gather table @sg, containing @n_elem
4991 * elements.
4992 *
4993 * LOCKING:
4994 * spin_lock_irqsave(host lock)
4995 */
4996 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
4997 unsigned int n_elem)
4998 {
4999 qc->sg = sg;
5000 qc->n_elem = n_elem;
5001 qc->cursg = qc->sg;
5002 }
5003
5004 #ifdef CONFIG_HAS_DMA
5005
5006 /**
5007 * ata_sg_clean - Unmap DMA memory associated with command
5008 * @qc: Command containing DMA memory to be released
5009 *
5010 * Unmap all mapped DMA memory associated with this command.
5011 *
5012 * LOCKING:
5013 * spin_lock_irqsave(host lock)
5014 */
5015 static void ata_sg_clean(struct ata_queued_cmd *qc)
5016 {
5017 struct ata_port *ap = qc->ap;
5018 struct scatterlist *sg = qc->sg;
5019 int dir = qc->dma_dir;
5020
5021 WARN_ON_ONCE(sg == NULL);
5022
5023 VPRINTK("unmapping %u sg elements\n", qc->n_elem);
5024
5025 if (qc->n_elem)
5026 dma_unmap_sg(ap->dev, sg, qc->orig_n_elem, dir);
5027
5028 qc->flags &= ~ATA_QCFLAG_DMAMAP;
5029 qc->sg = NULL;
5030 }
5031
5032 /**
5033 * ata_sg_setup - DMA-map the scatter-gather table associated with a command.
5034 * @qc: Command with scatter-gather table to be mapped.
5035 *
5036 * DMA-map the scatter-gather table associated with queued_cmd @qc.
5037 *
5038 * LOCKING:
5039 * spin_lock_irqsave(host lock)
5040 *
5041 * RETURNS:
5042 * Zero on success, negative on error.
5043 *
5044 */
5045 static int ata_sg_setup(struct ata_queued_cmd *qc)
5046 {
5047 struct ata_port *ap = qc->ap;
5048 unsigned int n_elem;
5049
5050 VPRINTK("ENTER, ata%u\n", ap->print_id);
5051
5052 n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir);
5053 if (n_elem < 1)
5054 return -1;
5055
5056 VPRINTK("%d sg elements mapped\n", n_elem);
5057 qc->orig_n_elem = qc->n_elem;
5058 qc->n_elem = n_elem;
5059 qc->flags |= ATA_QCFLAG_DMAMAP;
5060
5061 return 0;
5062 }
5063
5064 #else /* !CONFIG_HAS_DMA */
5065
5066 static inline void ata_sg_clean(struct ata_queued_cmd *qc) {}
5067 static inline int ata_sg_setup(struct ata_queued_cmd *qc) { return -1; }
5068
5069 #endif /* !CONFIG_HAS_DMA */
5070
5071 /**
5072 * swap_buf_le16 - swap halves of 16-bit words in place
5073 * @buf: Buffer to swap
5074 * @buf_words: Number of 16-bit words in buffer.
5075 *
5076 * Swap halves of 16-bit words if needed to convert from
5077 * little-endian byte order to native cpu byte order, or
5078 * vice-versa.
5079 *
5080 * LOCKING:
5081 * Inherited from caller.
5082 */
5083 void swap_buf_le16(u16 *buf, unsigned int buf_words)
5084 {
5085 #ifdef __BIG_ENDIAN
5086 unsigned int i;
5087
5088 for (i = 0; i < buf_words; i++)
5089 buf[i] = le16_to_cpu(buf[i]);
5090 #endif /* __BIG_ENDIAN */
5091 }
5092
5093 /**
5094 * ata_qc_new_init - Request an available ATA command, and initialize it
5095 * @dev: Device from whom we request an available command structure
5096 * @tag: tag
5097 *
5098 * LOCKING:
5099 * None.
5100 */
5101
5102 struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev, int tag)
5103 {
5104 struct ata_port *ap = dev->link->ap;
5105 struct ata_queued_cmd *qc;
5106
5107 /* no command while frozen */
5108 if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
5109 return NULL;
5110
5111 /* libsas case */
5112 if (ap->flags & ATA_FLAG_SAS_HOST) {
5113 tag = ata_sas_allocate_tag(ap);
5114 if (tag < 0)
5115 return NULL;
5116 }
5117
5118 qc = __ata_qc_from_tag(ap, tag);
5119 qc->tag = qc->hw_tag = tag;
5120 qc->scsicmd = NULL;
5121 qc->ap = ap;
5122 qc->dev = dev;
5123
5124 ata_qc_reinit(qc);
5125
5126 return qc;
5127 }
5128
5129 /**
5130 * ata_qc_free - free unused ata_queued_cmd
5131 * @qc: Command to complete
5132 *
5133 * Designed to free unused ata_queued_cmd object
5134 * in case something prevents using it.
5135 *
5136 * LOCKING:
5137 * spin_lock_irqsave(host lock)
5138 */
5139 void ata_qc_free(struct ata_queued_cmd *qc)
5140 {
5141 struct ata_port *ap;
5142 unsigned int tag;
5143
5144 WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
5145 ap = qc->ap;
5146
5147 qc->flags = 0;
5148 tag = qc->tag;
5149 if (ata_tag_valid(tag)) {
5150 qc->tag = ATA_TAG_POISON;
5151 if (ap->flags & ATA_FLAG_SAS_HOST)
5152 ata_sas_free_tag(tag, ap);
5153 }
5154 }
5155
5156 void __ata_qc_complete(struct ata_queued_cmd *qc)
5157 {
5158 struct ata_port *ap;
5159 struct ata_link *link;
5160
5161 WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
5162 WARN_ON_ONCE(!(qc->flags & ATA_QCFLAG_ACTIVE));
5163 ap = qc->ap;
5164 link = qc->dev->link;
5165
5166 if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
5167 ata_sg_clean(qc);
5168
5169 /* command should be marked inactive atomically with qc completion */
5170 if (ata_is_ncq(qc->tf.protocol)) {
5171 link->sactive &= ~(1 << qc->hw_tag);
5172 if (!link->sactive)
5173 ap->nr_active_links--;
5174 } else {
5175 link->active_tag = ATA_TAG_POISON;
5176 ap->nr_active_links--;
5177 }
5178
5179 /* clear exclusive status */
5180 if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
5181 ap->excl_link == link))
5182 ap->excl_link = NULL;
5183
5184 /* atapi: mark qc as inactive to prevent the interrupt handler
5185 * from completing the command twice later, before the error handler
5186 * is called. (when rc != 0 and atapi request sense is needed)
5187 */
5188 qc->flags &= ~ATA_QCFLAG_ACTIVE;
5189 ap->qc_active &= ~(1ULL << qc->tag);
5190
5191 /* call completion callback */
5192 qc->complete_fn(qc);
5193 }
5194
5195 static void fill_result_tf(struct ata_queued_cmd *qc)
5196 {
5197 struct ata_port *ap = qc->ap;
5198
5199 qc->result_tf.flags = qc->tf.flags;
5200 ap->ops->qc_fill_rtf(qc);
5201 }
5202
5203 static void ata_verify_xfer(struct ata_queued_cmd *qc)
5204 {
5205 struct ata_device *dev = qc->dev;
5206
5207 if (!ata_is_data(qc->tf.protocol))
5208 return;
5209
5210 if ((dev->mwdma_mask || dev->udma_mask) && ata_is_pio(qc->tf.protocol))
5211 return;
5212
5213 dev->flags &= ~ATA_DFLAG_DUBIOUS_XFER;
5214 }
5215
5216 /**
5217 * ata_qc_complete - Complete an active ATA command
5218 * @qc: Command to complete
5219 *
5220 * Indicate to the mid and upper layers that an ATA command has
5221 * completed, with either an ok or not-ok status.
5222 *
5223 * Refrain from calling this function multiple times when
5224 * successfully completing multiple NCQ commands.
5225 * ata_qc_complete_multiple() should be used instead, which will
5226 * properly update IRQ expect state.
5227 *
5228 * LOCKING:
5229 * spin_lock_irqsave(host lock)
5230 */
5231 void ata_qc_complete(struct ata_queued_cmd *qc)
5232 {
5233 struct ata_port *ap = qc->ap;
5234
5235 /* Trigger the LED (if available) */
5236 ledtrig_disk_activity(!!(qc->tf.flags & ATA_TFLAG_WRITE));
5237
5238 /* XXX: New EH and old EH use different mechanisms to
5239 * synchronize EH with regular execution path.
5240 *
5241 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
5242 * Normal execution path is responsible for not accessing a
5243 * failed qc. libata core enforces the rule by returning NULL
5244 * from ata_qc_from_tag() for failed qcs.
5245 *
5246 * Old EH depends on ata_qc_complete() nullifying completion
5247 * requests if ATA_QCFLAG_EH_SCHEDULED is set. Old EH does
5248 * not synchronize with interrupt handler. Only PIO task is
5249 * taken care of.
5250 */
5251 if (ap->ops->error_handler) {
5252 struct ata_device *dev = qc->dev;
5253 struct ata_eh_info *ehi = &dev->link->eh_info;
5254
5255 if (unlikely(qc->err_mask))
5256 qc->flags |= ATA_QCFLAG_FAILED;
5257
5258 /*
5259 * Finish internal commands without any further processing
5260 * and always with the result TF filled.
5261 */
5262 if (unlikely(ata_tag_internal(qc->tag))) {
5263 fill_result_tf(qc);
5264 trace_ata_qc_complete_internal(qc);
5265 __ata_qc_complete(qc);
5266 return;
5267 }
5268
5269 /*
5270 * Non-internal qc has failed. Fill the result TF and
5271 * summon EH.
5272 */
5273 if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
5274 fill_result_tf(qc);
5275 trace_ata_qc_complete_failed(qc);
5276 ata_qc_schedule_eh(qc);
5277 return;
5278 }
5279
5280 WARN_ON_ONCE(ap->pflags & ATA_PFLAG_FROZEN);
5281
5282 /* read result TF if requested */
5283 if (qc->flags & ATA_QCFLAG_RESULT_TF)
5284 fill_result_tf(qc);
5285
5286 trace_ata_qc_complete_done(qc);
5287 /* Some commands need post-processing after successful
5288 * completion.
5289 */
5290 switch (qc->tf.command) {
5291 case ATA_CMD_SET_FEATURES:
5292 if (qc->tf.feature != SETFEATURES_WC_ON &&
5293 qc->tf.feature != SETFEATURES_WC_OFF &&
5294 qc->tf.feature != SETFEATURES_RA_ON &&
5295 qc->tf.feature != SETFEATURES_RA_OFF)
5296 break;
5297 /* fall through */
5298 case ATA_CMD_INIT_DEV_PARAMS: /* CHS translation changed */
5299 case ATA_CMD_SET_MULTI: /* multi_count changed */
5300 /* revalidate device */
5301 ehi->dev_action[dev->devno] |= ATA_EH_REVALIDATE;
5302 ata_port_schedule_eh(ap);
5303 break;
5304
5305 case ATA_CMD_SLEEP:
5306 dev->flags |= ATA_DFLAG_SLEEPING;
5307 break;
5308 }
5309
5310 if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
5311 ata_verify_xfer(qc);
5312
5313 __ata_qc_complete(qc);
5314 } else {
5315 if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
5316 return;
5317
5318 /* read result TF if failed or requested */
5319 if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
5320 fill_result_tf(qc);
5321
5322 __ata_qc_complete(qc);
5323 }
5324 }
5325
5326 /**
5327 * ata_qc_get_active - get bitmask of active qcs
5328 * @ap: port in question
5329 *
5330 * LOCKING:
5331 * spin_lock_irqsave(host lock)
5332 *
5333 * RETURNS:
5334 * Bitmask of active qcs
5335 */
5336 u64 ata_qc_get_active(struct ata_port *ap)
5337 {
5338 u64 qc_active = ap->qc_active;
5339
5340 /* ATA_TAG_INTERNAL is sent to hw as tag 0 */
5341 if (qc_active & (1ULL << ATA_TAG_INTERNAL)) {
5342 qc_active |= (1 << 0);
5343 qc_active &= ~(1ULL << ATA_TAG_INTERNAL);
5344 }
5345
5346 return qc_active;
5347 }
5348 EXPORT_SYMBOL_GPL(ata_qc_get_active);
5349
5350 /**
5351 * ata_qc_complete_multiple - Complete multiple qcs successfully
5352 * @ap: port in question
5353 * @qc_active: new qc_active mask
5354 *
5355 * Complete in-flight commands. This functions is meant to be
5356 * called from low-level driver's interrupt routine to complete
5357 * requests normally. ap->qc_active and @qc_active is compared
5358 * and commands are completed accordingly.
5359 *
5360 * Always use this function when completing multiple NCQ commands
5361 * from IRQ handlers instead of calling ata_qc_complete()
5362 * multiple times to keep IRQ expect status properly in sync.
5363 *
5364 * LOCKING:
5365 * spin_lock_irqsave(host lock)
5366 *
5367 * RETURNS:
5368 * Number of completed commands on success, -errno otherwise.
5369 */
5370 int ata_qc_complete_multiple(struct ata_port *ap, u64 qc_active)
5371 {
5372 u64 done_mask, ap_qc_active = ap->qc_active;
5373 int nr_done = 0;
5374
5375 /*
5376 * If the internal tag is set on ap->qc_active, then we care about
5377 * bit0 on the passed in qc_active mask. Move that bit up to match
5378 * the internal tag.
5379 */
5380 if (ap_qc_active & (1ULL << ATA_TAG_INTERNAL)) {
5381 qc_active |= (qc_active & 0x01) << ATA_TAG_INTERNAL;
5382 qc_active ^= qc_active & 0x01;
5383 }
5384
5385 done_mask = ap_qc_active ^ qc_active;
5386
5387 if (unlikely(done_mask & qc_active)) {
5388 ata_port_err(ap, "illegal qc_active transition (%08llx->%08llx)\n",
5389 ap->qc_active, qc_active);
5390 return -EINVAL;
5391 }
5392
5393 while (done_mask) {
5394 struct ata_queued_cmd *qc;
5395 unsigned int tag = __ffs64(done_mask);
5396
5397 qc = ata_qc_from_tag(ap, tag);
5398 if (qc) {
5399 ata_qc_complete(qc);
5400 nr_done++;
5401 }
5402 done_mask &= ~(1ULL << tag);
5403 }
5404
5405 return nr_done;
5406 }
5407
5408 /**
5409 * ata_qc_issue - issue taskfile to device
5410 * @qc: command to issue to device
5411 *
5412 * Prepare an ATA command to submission to device.
5413 * This includes mapping the data into a DMA-able
5414 * area, filling in the S/G table, and finally
5415 * writing the taskfile to hardware, starting the command.
5416 *
5417 * LOCKING:
5418 * spin_lock_irqsave(host lock)
5419 */
5420 void ata_qc_issue(struct ata_queued_cmd *qc)
5421 {
5422 struct ata_port *ap = qc->ap;
5423 struct ata_link *link = qc->dev->link;
5424 u8 prot = qc->tf.protocol;
5425
5426 /* Make sure only one non-NCQ command is outstanding. The
5427 * check is skipped for old EH because it reuses active qc to
5428 * request ATAPI sense.
5429 */
5430 WARN_ON_ONCE(ap->ops->error_handler && ata_tag_valid(link->active_tag));
5431
5432 if (ata_is_ncq(prot)) {
5433 WARN_ON_ONCE(link->sactive & (1 << qc->hw_tag));
5434
5435 if (!link->sactive)
5436 ap->nr_active_links++;
5437 link->sactive |= 1 << qc->hw_tag;
5438 } else {
5439 WARN_ON_ONCE(link->sactive);
5440
5441 ap->nr_active_links++;
5442 link->active_tag = qc->tag;
5443 }
5444
5445 qc->flags |= ATA_QCFLAG_ACTIVE;
5446 ap->qc_active |= 1ULL << qc->tag;
5447
5448 /*
5449 * We guarantee to LLDs that they will have at least one
5450 * non-zero sg if the command is a data command.
5451 */
5452 if (ata_is_data(prot) && (!qc->sg || !qc->n_elem || !qc->nbytes))
5453 goto sys_err;
5454
5455 if (ata_is_dma(prot) || (ata_is_pio(prot) &&
5456 (ap->flags & ATA_FLAG_PIO_DMA)))
5457 if (ata_sg_setup(qc))
5458 goto sys_err;
5459
5460 /* if device is sleeping, schedule reset and abort the link */
5461 if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
5462 link->eh_info.action |= ATA_EH_RESET;
5463 ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
5464 ata_link_abort(link);
5465 return;
5466 }
5467
5468 ap->ops->qc_prep(qc);
5469 trace_ata_qc_issue(qc);
5470 qc->err_mask |= ap->ops->qc_issue(qc);
5471 if (unlikely(qc->err_mask))
5472 goto err;
5473 return;
5474
5475 sys_err:
5476 qc->err_mask |= AC_ERR_SYSTEM;
5477 err:
5478 ata_qc_complete(qc);
5479 }
5480
5481 /**
5482 * sata_scr_valid - test whether SCRs are accessible
5483 * @link: ATA link to test SCR accessibility for
5484 *
5485 * Test whether SCRs are accessible for @link.
5486 *
5487 * LOCKING:
5488 * None.
5489 *
5490 * RETURNS:
5491 * 1 if SCRs are accessible, 0 otherwise.
5492 */
5493 int sata_scr_valid(struct ata_link *link)
5494 {
5495 struct ata_port *ap = link->ap;
5496
5497 return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
5498 }
5499
5500 /**
5501 * sata_scr_read - read SCR register of the specified port
5502 * @link: ATA link to read SCR for
5503 * @reg: SCR to read
5504 * @val: Place to store read value
5505 *
5506 * Read SCR register @reg of @link into *@val. This function is
5507 * guaranteed to succeed if @link is ap->link, the cable type of
5508 * the port is SATA and the port implements ->scr_read.
5509 *
5510 * LOCKING:
5511 * None if @link is ap->link. Kernel thread context otherwise.
5512 *
5513 * RETURNS:
5514 * 0 on success, negative errno on failure.
5515 */
5516 int sata_scr_read(struct ata_link *link, int reg, u32 *val)
5517 {
5518 if (ata_is_host_link(link)) {
5519 if (sata_scr_valid(link))
5520 return link->ap->ops->scr_read(link, reg, val);
5521 return -EOPNOTSUPP;
5522 }
5523
5524 return sata_pmp_scr_read(link, reg, val);
5525 }
5526
5527 /**
5528 * sata_scr_write - write SCR register of the specified port
5529 * @link: ATA link to write SCR for
5530 * @reg: SCR to write
5531 * @val: value to write
5532 *
5533 * Write @val to SCR register @reg of @link. This function is
5534 * guaranteed to succeed if @link is ap->link, the cable type of
5535 * the port is SATA and the port implements ->scr_read.
5536 *
5537 * LOCKING:
5538 * None if @link is ap->link. Kernel thread context otherwise.
5539 *
5540 * RETURNS:
5541 * 0 on success, negative errno on failure.
5542 */
5543 int sata_scr_write(struct ata_link *link, int reg, u32 val)
5544 {
5545 if (ata_is_host_link(link)) {
5546 if (sata_scr_valid(link))
5547 return link->ap->ops->scr_write(link, reg, val);
5548 return -EOPNOTSUPP;
5549 }
5550
5551 return sata_pmp_scr_write(link, reg, val);
5552 }
5553
5554 /**
5555 * sata_scr_write_flush - write SCR register of the specified port and flush
5556 * @link: ATA link to write SCR for
5557 * @reg: SCR to write
5558 * @val: value to write
5559 *
5560 * This function is identical to sata_scr_write() except that this
5561 * function performs flush after writing to the register.
5562 *
5563 * LOCKING:
5564 * None if @link is ap->link. Kernel thread context otherwise.
5565 *
5566 * RETURNS:
5567 * 0 on success, negative errno on failure.
5568 */
5569 int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
5570 {
5571 if (ata_is_host_link(link)) {
5572 int rc;
5573
5574 if (sata_scr_valid(link)) {
5575 rc = link->ap->ops->scr_write(link, reg, val);
5576 if (rc == 0)
5577 rc = link->ap->ops->scr_read(link, reg, &val);
5578 return rc;
5579 }
5580 return -EOPNOTSUPP;
5581 }
5582
5583 return sata_pmp_scr_write(link, reg, val);
5584 }
5585
5586 /**
5587 * ata_phys_link_online - test whether the given link is online
5588 * @link: ATA link to test
5589 *
5590 * Test whether @link is online. Note that this function returns
5591 * 0 if online status of @link cannot be obtained, so
5592 * ata_link_online(link) != !ata_link_offline(link).
5593 *
5594 * LOCKING:
5595 * None.
5596 *
5597 * RETURNS:
5598 * True if the port online status is available and online.
5599 */
5600 bool ata_phys_link_online(struct ata_link *link)
5601 {
5602 u32 sstatus;
5603
5604 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5605 ata_sstatus_online(sstatus))
5606 return true;
5607 return false;
5608 }
5609
5610 /**
5611 * ata_phys_link_offline - test whether the given link is offline
5612 * @link: ATA link to test
5613 *
5614 * Test whether @link is offline. Note that this function
5615 * returns 0 if offline status of @link cannot be obtained, so
5616 * ata_link_online(link) != !ata_link_offline(link).
5617 *
5618 * LOCKING:
5619 * None.
5620 *
5621 * RETURNS:
5622 * True if the port offline status is available and offline.
5623 */
5624 bool ata_phys_link_offline(struct ata_link *link)
5625 {
5626 u32 sstatus;
5627
5628 if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5629 !ata_sstatus_online(sstatus))
5630 return true;
5631 return false;
5632 }
5633
5634 /**
5635 * ata_link_online - test whether the given link is online
5636 * @link: ATA link to test
5637 *
5638 * Test whether @link is online. This is identical to
5639 * ata_phys_link_online() when there's no slave link. When
5640 * there's a slave link, this function should only be called on
5641 * the master link and will return true if any of M/S links is
5642 * online.
5643 *
5644 * LOCKING:
5645 * None.
5646 *
5647 * RETURNS:
5648 * True if the port online status is available and online.
5649 */
5650 bool ata_link_online(struct ata_link *link)
5651 {
5652 struct ata_link *slave = link->ap->slave_link;
5653
5654 WARN_ON(link == slave); /* shouldn't be called on slave link */
5655
5656 return ata_phys_link_online(link) ||
5657 (slave && ata_phys_link_online(slave));
5658 }
5659
5660 /**
5661 * ata_link_offline - test whether the given link is offline
5662 * @link: ATA link to test
5663 *
5664 * Test whether @link is offline. This is identical to
5665 * ata_phys_link_offline() when there's no slave link. When
5666 * there's a slave link, this function should only be called on
5667 * the master link and will return true if both M/S links are
5668 * offline.
5669 *
5670 * LOCKING:
5671 * None.
5672 *
5673 * RETURNS:
5674 * True if the port offline status is available and offline.
5675 */
5676 bool ata_link_offline(struct ata_link *link)
5677 {
5678 struct ata_link *slave = link->ap->slave_link;
5679
5680 WARN_ON(link == slave); /* shouldn't be called on slave link */
5681
5682 return ata_phys_link_offline(link) &&
5683 (!slave || ata_phys_link_offline(slave));
5684 }
5685
5686 #ifdef CONFIG_PM
5687 static void ata_port_request_pm(struct ata_port *ap, pm_message_t mesg,
5688 unsigned int action, unsigned int ehi_flags,
5689 bool async)
5690 {
5691 struct ata_link *link;
5692 unsigned long flags;
5693
5694 /* Previous resume operation might still be in
5695 * progress. Wait for PM_PENDING to clear.
5696 */
5697 if (ap->pflags & ATA_PFLAG_PM_PENDING) {
5698 ata_port_wait_eh(ap);
5699 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
5700 }
5701
5702 /* request PM ops to EH */
5703 spin_lock_irqsave(ap->lock, flags);
5704
5705 ap->pm_mesg = mesg;
5706 ap->pflags |= ATA_PFLAG_PM_PENDING;
5707 ata_for_each_link(link, ap, HOST_FIRST) {
5708 link->eh_info.action |= action;
5709 link->eh_info.flags |= ehi_flags;
5710 }
5711
5712 ata_port_schedule_eh(ap);
5713
5714 spin_unlock_irqrestore(ap->lock, flags);
5715
5716 if (!async) {
5717 ata_port_wait_eh(ap);
5718 WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
5719 }
5720 }
5721
5722 /*
5723 * On some hardware, device fails to respond after spun down for suspend. As
5724 * the device won't be used before being resumed, we don't need to touch the
5725 * device. Ask EH to skip the usual stuff and proceed directly to suspend.
5726 *
5727 * http://thread.gmane.org/gmane.linux.ide/46764
5728 */
5729 static const unsigned int ata_port_suspend_ehi = ATA_EHI_QUIET
5730 | ATA_EHI_NO_AUTOPSY
5731 | ATA_EHI_NO_RECOVERY;
5732
5733 static void ata_port_suspend(struct ata_port *ap, pm_message_t mesg)
5734 {
5735 ata_port_request_pm(ap, mesg, 0, ata_port_suspend_ehi, false);
5736 }
5737
5738 static void ata_port_suspend_async(struct ata_port *ap, pm_message_t mesg)
5739 {
5740 ata_port_request_pm(ap, mesg, 0, ata_port_suspend_ehi, true);
5741 }
5742
5743 static int ata_port_pm_suspend(struct device *dev)
5744 {
5745 struct ata_port *ap = to_ata_port(dev);
5746
5747 if (pm_runtime_suspended(dev))
5748 return 0;
5749
5750 ata_port_suspend(ap, PMSG_SUSPEND);
5751 return 0;
5752 }
5753
5754 static int ata_port_pm_freeze(struct device *dev)
5755 {
5756 struct ata_port *ap = to_ata_port(dev);
5757
5758 if (pm_runtime_suspended(dev))
5759 return 0;
5760
5761 ata_port_suspend(ap, PMSG_FREEZE);
5762 return 0;
5763 }
5764
5765 static int ata_port_pm_poweroff(struct device *dev)
5766 {
5767 ata_port_suspend(to_ata_port(dev), PMSG_HIBERNATE);
5768 return 0;
5769 }
5770
5771 static const unsigned int ata_port_resume_ehi = ATA_EHI_NO_AUTOPSY
5772 | ATA_EHI_QUIET;
5773
5774 static void ata_port_resume(struct ata_port *ap, pm_message_t mesg)
5775 {
5776 ata_port_request_pm(ap, mesg, ATA_EH_RESET, ata_port_resume_ehi, false);
5777 }
5778
5779 static void ata_port_resume_async(struct ata_port *ap, pm_message_t mesg)
5780 {
5781 ata_port_request_pm(ap, mesg, ATA_EH_RESET, ata_port_resume_ehi, true);
5782 }
5783
5784 static int ata_port_pm_resume(struct device *dev)
5785 {
5786 ata_port_resume_async(to_ata_port(dev), PMSG_RESUME);
5787 pm_runtime_disable(dev);
5788 pm_runtime_set_active(dev);
5789 pm_runtime_enable(dev);
5790 return 0;
5791 }
5792
5793 /*
5794 * For ODDs, the upper layer will poll for media change every few seconds,
5795 * which will make it enter and leave suspend state every few seconds. And
5796 * as each suspend will cause a hard/soft reset, the gain of runtime suspend
5797 * is very little and the ODD may malfunction after constantly being reset.
5798 * So the idle callback here will not proceed to suspend if a non-ZPODD capable
5799 * ODD is attached to the port.
5800 */
5801 static int ata_port_runtime_idle(struct device *dev)
5802 {
5803 struct ata_port *ap = to_ata_port(dev);
5804 struct ata_link *link;
5805 struct ata_device *adev;
5806
5807 ata_for_each_link(link, ap, HOST_FIRST) {
5808 ata_for_each_dev(adev, link, ENABLED)
5809 if (adev->class == ATA_DEV_ATAPI &&
5810 !zpodd_dev_enabled(adev))
5811 return -EBUSY;
5812 }
5813
5814 return 0;
5815 }
5816
5817 static int ata_port_runtime_suspend(struct device *dev)
5818 {
5819 ata_port_suspend(to_ata_port(dev), PMSG_AUTO_SUSPEND);
5820 return 0;
5821 }
5822
5823 static int ata_port_runtime_resume(struct device *dev)
5824 {
5825 ata_port_resume(to_ata_port(dev), PMSG_AUTO_RESUME);
5826 return 0;
5827 }
5828
5829 static const struct dev_pm_ops ata_port_pm_ops = {
5830 .suspend = ata_port_pm_suspend,
5831 .resume = ata_port_pm_resume,
5832 .freeze = ata_port_pm_freeze,
5833 .thaw = ata_port_pm_resume,
5834 .poweroff = ata_port_pm_poweroff,
5835 .restore = ata_port_pm_resume,
5836
5837 .runtime_suspend = ata_port_runtime_suspend,
5838 .runtime_resume = ata_port_runtime_resume,
5839 .runtime_idle = ata_port_runtime_idle,
5840 };
5841
5842 /* sas ports don't participate in pm runtime management of ata_ports,
5843 * and need to resume ata devices at the domain level, not the per-port
5844 * level. sas suspend/resume is async to allow parallel port recovery
5845 * since sas has multiple ata_port instances per Scsi_Host.
5846 */
5847 void ata_sas_port_suspend(struct ata_port *ap)
5848 {
5849 ata_port_suspend_async(ap, PMSG_SUSPEND);
5850 }
5851 EXPORT_SYMBOL_GPL(ata_sas_port_suspend);
5852
5853 void ata_sas_port_resume(struct ata_port *ap)
5854 {
5855 ata_port_resume_async(ap, PMSG_RESUME);
5856 }
5857 EXPORT_SYMBOL_GPL(ata_sas_port_resume);
5858
5859 /**
5860 * ata_host_suspend - suspend host
5861 * @host: host to suspend
5862 * @mesg: PM message
5863 *
5864 * Suspend @host. Actual operation is performed by port suspend.
5865 */
5866 int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5867 {
5868 host->dev->power.power_state = mesg;
5869 return 0;
5870 }
5871
5872 /**
5873 * ata_host_resume - resume host
5874 * @host: host to resume
5875 *
5876 * Resume @host. Actual operation is performed by port resume.
5877 */
5878 void ata_host_resume(struct ata_host *host)
5879 {
5880 host->dev->power.power_state = PMSG_ON;
5881 }
5882 #endif
5883
5884 const struct device_type ata_port_type = {
5885 .name = "ata_port",
5886 #ifdef CONFIG_PM
5887 .pm = &ata_port_pm_ops,
5888 #endif
5889 };
5890
5891 /**
5892 * ata_dev_init - Initialize an ata_device structure
5893 * @dev: Device structure to initialize
5894 *
5895 * Initialize @dev in preparation for probing.
5896 *
5897 * LOCKING:
5898 * Inherited from caller.
5899 */
5900 void ata_dev_init(struct ata_device *dev)
5901 {
5902 struct ata_link *link = ata_dev_phys_link(dev);
5903 struct ata_port *ap = link->ap;
5904 unsigned long flags;
5905
5906 /* SATA spd limit is bound to the attached device, reset together */
5907 link->sata_spd_limit = link->hw_sata_spd_limit;
5908 link->sata_spd = 0;
5909
5910 /* High bits of dev->flags are used to record warm plug
5911 * requests which occur asynchronously. Synchronize using
5912 * host lock.
5913 */
5914 spin_lock_irqsave(ap->lock, flags);
5915 dev->flags &= ~ATA_DFLAG_INIT_MASK;
5916 dev->horkage = 0;
5917 spin_unlock_irqrestore(ap->lock, flags);
5918
5919 memset((void *)dev + ATA_DEVICE_CLEAR_BEGIN, 0,
5920 ATA_DEVICE_CLEAR_END - ATA_DEVICE_CLEAR_BEGIN);
5921 dev->pio_mask = UINT_MAX;
5922 dev->mwdma_mask = UINT_MAX;
5923 dev->udma_mask = UINT_MAX;
5924 }
5925
5926 /**
5927 * ata_link_init - Initialize an ata_link structure
5928 * @ap: ATA port link is attached to
5929 * @link: Link structure to initialize
5930 * @pmp: Port multiplier port number
5931 *
5932 * Initialize @link.
5933 *
5934 * LOCKING:
5935 * Kernel thread context (may sleep)
5936 */
5937 void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
5938 {
5939 int i;
5940
5941 /* clear everything except for devices */
5942 memset((void *)link + ATA_LINK_CLEAR_BEGIN, 0,
5943 ATA_LINK_CLEAR_END - ATA_LINK_CLEAR_BEGIN);
5944
5945 link->ap = ap;
5946 link->pmp = pmp;
5947 link->active_tag = ATA_TAG_POISON;
5948 link->hw_sata_spd_limit = UINT_MAX;
5949
5950 /* can't use iterator, ap isn't initialized yet */
5951 for (i = 0; i < ATA_MAX_DEVICES; i++) {
5952 struct ata_device *dev = &link->device[i];
5953
5954 dev->link = link;
5955 dev->devno = dev - link->device;
5956 #ifdef CONFIG_ATA_ACPI
5957 dev->gtf_filter = ata_acpi_gtf_filter;
5958 #endif
5959 ata_dev_init(dev);
5960 }
5961 }
5962
5963 /**
5964 * sata_link_init_spd - Initialize link->sata_spd_limit
5965 * @link: Link to configure sata_spd_limit for
5966 *
5967 * Initialize @link->[hw_]sata_spd_limit to the currently
5968 * configured value.
5969 *
5970 * LOCKING:
5971 * Kernel thread context (may sleep).
5972 *
5973 * RETURNS:
5974 * 0 on success, -errno on failure.
5975 */
5976 int sata_link_init_spd(struct ata_link *link)
5977 {
5978 u8 spd;
5979 int rc;
5980
5981 rc = sata_scr_read(link, SCR_CONTROL, &link->saved_scontrol);
5982 if (rc)
5983 return rc;
5984
5985 spd = (link->saved_scontrol >> 4) & 0xf;
5986 if (spd)
5987 link->hw_sata_spd_limit &= (1 << spd) - 1;
5988
5989 ata_force_link_limits(link);
5990
5991 link->sata_spd_limit = link->hw_sata_spd_limit;
5992
5993 return 0;
5994 }
5995
5996 /**
5997 * ata_port_alloc - allocate and initialize basic ATA port resources
5998 * @host: ATA host this allocated port belongs to
5999 *
6000 * Allocate and initialize basic ATA port resources.
6001 *
6002 * RETURNS:
6003 * Allocate ATA port on success, NULL on failure.
6004 *
6005 * LOCKING:
6006 * Inherited from calling layer (may sleep).
6007 */
6008 struct ata_port *ata_port_alloc(struct ata_host *host)
6009 {
6010 struct ata_port *ap;
6011
6012 DPRINTK("ENTER\n");
6013
6014 ap = kzalloc(sizeof(*ap), GFP_KERNEL);
6015 if (!ap)
6016 return NULL;
6017
6018 ap->pflags |= ATA_PFLAG_INITIALIZING | ATA_PFLAG_FROZEN;
6019 ap->lock = &host->lock;
6020 ap->print_id = -1;
6021 ap->local_port_no = -1;
6022 ap->host = host;
6023 ap->dev = host->dev;
6024
6025 #if defined(ATA_VERBOSE_DEBUG)
6026 /* turn on all debugging levels */
6027 ap->msg_enable = 0x00FF;
6028 #elif defined(ATA_DEBUG)
6029 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_INFO | ATA_MSG_CTL | ATA_MSG_WARN | ATA_MSG_ERR;
6030 #else
6031 ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
6032 #endif
6033
6034 mutex_init(&ap->scsi_scan_mutex);
6035 INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
6036 INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
6037 INIT_LIST_HEAD(&ap->eh_done_q);
6038 init_waitqueue_head(&ap->eh_wait_q);
6039 init_completion(&ap->park_req_pending);
6040 timer_setup(&ap->fastdrain_timer, ata_eh_fastdrain_timerfn,
6041 TIMER_DEFERRABLE);
6042
6043 ap->cbl = ATA_CBL_NONE;
6044
6045 ata_link_init(ap, &ap->link, 0);
6046
6047 #ifdef ATA_IRQ_TRAP
6048 ap->stats.unhandled_irq = 1;
6049 ap->stats.idle_irq = 1;
6050 #endif
6051 ata_sff_port_init(ap);
6052
6053 return ap;
6054 }
6055
6056 static void ata_devres_release(struct device *gendev, void *res)
6057 {
6058 struct ata_host *host = dev_get_drvdata(gendev);
6059 int i;
6060
6061 for (i = 0; i < host->n_ports; i++) {
6062 struct ata_port *ap = host->ports[i];
6063
6064 if (!ap)
6065 continue;
6066
6067 if (ap->scsi_host)
6068 scsi_host_put(ap->scsi_host);
6069
6070 }
6071
6072 dev_set_drvdata(gendev, NULL);
6073 ata_host_put(host);
6074 }
6075
6076 static void ata_host_release(struct kref *kref)
6077 {
6078 struct ata_host *host = container_of(kref, struct ata_host, kref);
6079 int i;
6080
6081 for (i = 0; i < host->n_ports; i++) {
6082 struct ata_port *ap = host->ports[i];
6083
6084 kfree(ap->pmp_link);
6085 kfree(ap->slave_link);
6086 kfree(ap);
6087 host->ports[i] = NULL;
6088 }
6089 kfree(host);
6090 }
6091
6092 void ata_host_get(struct ata_host *host)
6093 {
6094 kref_get(&host->kref);
6095 }
6096
6097 void ata_host_put(struct ata_host *host)
6098 {
6099 kref_put(&host->kref, ata_host_release);
6100 }
6101
6102 /**
6103 * ata_host_alloc - allocate and init basic ATA host resources
6104 * @dev: generic device this host is associated with
6105 * @max_ports: maximum number of ATA ports associated with this host
6106 *
6107 * Allocate and initialize basic ATA host resources. LLD calls
6108 * this function to allocate a host, initializes it fully and
6109 * attaches it using ata_host_register().
6110 *
6111 * @max_ports ports are allocated and host->n_ports is
6112 * initialized to @max_ports. The caller is allowed to decrease
6113 * host->n_ports before calling ata_host_register(). The unused
6114 * ports will be automatically freed on registration.
6115 *
6116 * RETURNS:
6117 * Allocate ATA host on success, NULL on failure.
6118 *
6119 * LOCKING:
6120 * Inherited from calling layer (may sleep).
6121 */
6122 struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
6123 {
6124 struct ata_host *host;
6125 size_t sz;
6126 int i;
6127 void *dr;
6128
6129 DPRINTK("ENTER\n");
6130
6131 /* alloc a container for our list of ATA ports (buses) */
6132 sz = sizeof(struct ata_host) + (max_ports + 1) * sizeof(void *);
6133 host = kzalloc(sz, GFP_KERNEL);
6134 if (!host)
6135 return NULL;
6136
6137 if (!devres_open_group(dev, NULL, GFP_KERNEL))
6138 goto err_free;
6139
6140 dr = devres_alloc(ata_devres_release, 0, GFP_KERNEL);
6141 if (!dr)
6142 goto err_out;
6143
6144 devres_add(dev, dr);
6145 dev_set_drvdata(dev, host);
6146
6147 spin_lock_init(&host->lock);
6148 mutex_init(&host->eh_mutex);
6149 host->dev = dev;
6150 host->n_ports = max_ports;
6151 kref_init(&host->kref);
6152
6153 /* allocate ports bound to this host */
6154 for (i = 0; i < max_ports; i++) {
6155 struct ata_port *ap;
6156
6157 ap = ata_port_alloc(host);
6158 if (!ap)
6159 goto err_out;
6160
6161 ap->port_no = i;
6162 host->ports[i] = ap;
6163 }
6164
6165 devres_remove_group(dev, NULL);
6166 return host;
6167
6168 err_out:
6169 devres_release_group(dev, NULL);
6170 err_free:
6171 kfree(host);
6172 return NULL;
6173 }
6174
6175 /**
6176 * ata_host_alloc_pinfo - alloc host and init with port_info array
6177 * @dev: generic device this host is associated with
6178 * @ppi: array of ATA port_info to initialize host with
6179 * @n_ports: number of ATA ports attached to this host
6180 *
6181 * Allocate ATA host and initialize with info from @ppi. If NULL
6182 * terminated, @ppi may contain fewer entries than @n_ports. The
6183 * last entry will be used for the remaining ports.
6184 *
6185 * RETURNS:
6186 * Allocate ATA host on success, NULL on failure.
6187 *
6188 * LOCKING:
6189 * Inherited from calling layer (may sleep).
6190 */
6191 struct ata_host *ata_host_alloc_pinfo(struct device *dev,
6192 const struct ata_port_info * const * ppi,
6193 int n_ports)
6194 {
6195 const struct ata_port_info *pi;
6196 struct ata_host *host;
6197 int i, j;
6198
6199 host = ata_host_alloc(dev, n_ports);
6200 if (!host)
6201 return NULL;
6202
6203 for (i = 0, j = 0, pi = NULL; i < host->n_ports; i++) {
6204 struct ata_port *ap = host->ports[i];
6205
6206 if (ppi[j])
6207 pi = ppi[j++];
6208
6209 ap->pio_mask = pi->pio_mask;
6210 ap->mwdma_mask = pi->mwdma_mask;
6211 ap->udma_mask = pi->udma_mask;
6212 ap->flags |= pi->flags;
6213 ap->link.flags |= pi->link_flags;
6214 ap->ops = pi->port_ops;
6215
6216 if (!host->ops && (pi->port_ops != &ata_dummy_port_ops))
6217 host->ops = pi->port_ops;
6218 }
6219
6220 return host;
6221 }
6222
6223 /**
6224 * ata_slave_link_init - initialize slave link
6225 * @ap: port to initialize slave link for
6226 *
6227 * Create and initialize slave link for @ap. This enables slave
6228 * link handling on the port.
6229 *
6230 * In libata, a port contains links and a link contains devices.
6231 * There is single host link but if a PMP is attached to it,
6232 * there can be multiple fan-out links. On SATA, there's usually
6233 * a single device connected to a link but PATA and SATA
6234 * controllers emulating TF based interface can have two - master
6235 * and slave.
6236 *
6237 * However, there are a few controllers which don't fit into this
6238 * abstraction too well - SATA controllers which emulate TF
6239 * interface with both master and slave devices but also have
6240 * separate SCR register sets for each device. These controllers
6241 * need separate links for physical link handling
6242 * (e.g. onlineness, link speed) but should be treated like a
6243 * traditional M/S controller for everything else (e.g. command
6244 * issue, softreset).
6245 *
6246 * slave_link is libata's way of handling this class of
6247 * controllers without impacting core layer too much. For
6248 * anything other than physical link handling, the default host
6249 * link is used for both master and slave. For physical link
6250 * handling, separate @ap->slave_link is used. All dirty details
6251 * are implemented inside libata core layer. From LLD's POV, the
6252 * only difference is that prereset, hardreset and postreset are
6253 * called once more for the slave link, so the reset sequence
6254 * looks like the following.
6255 *
6256 * prereset(M) -> prereset(S) -> hardreset(M) -> hardreset(S) ->
6257 * softreset(M) -> postreset(M) -> postreset(S)
6258 *
6259 * Note that softreset is called only for the master. Softreset
6260 * resets both M/S by definition, so SRST on master should handle
6261 * both (the standard method will work just fine).
6262 *
6263 * LOCKING:
6264 * Should be called before host is registered.
6265 *
6266 * RETURNS:
6267 * 0 on success, -errno on failure.
6268 */
6269 int ata_slave_link_init(struct ata_port *ap)
6270 {
6271 struct ata_link *link;
6272
6273 WARN_ON(ap->slave_link);
6274 WARN_ON(ap->flags & ATA_FLAG_PMP);
6275
6276 link = kzalloc(sizeof(*link), GFP_KERNEL);
6277 if (!link)
6278 return -ENOMEM;
6279
6280 ata_link_init(ap, link, 1);
6281 ap->slave_link = link;
6282 return 0;
6283 }
6284
6285 static void ata_host_stop(struct device *gendev, void *res)
6286 {
6287 struct ata_host *host = dev_get_drvdata(gendev);
6288 int i;
6289
6290 WARN_ON(!(host->flags & ATA_HOST_STARTED));
6291
6292 for (i = 0; i < host->n_ports; i++) {
6293 struct ata_port *ap = host->ports[i];
6294
6295 if (ap->ops->port_stop)
6296 ap->ops->port_stop(ap);
6297 }
6298
6299 if (host->ops->host_stop)
6300 host->ops->host_stop(host);
6301 }
6302
6303 /**
6304 * ata_finalize_port_ops - finalize ata_port_operations
6305 * @ops: ata_port_operations to finalize
6306 *
6307 * An ata_port_operations can inherit from another ops and that
6308 * ops can again inherit from another. This can go on as many
6309 * times as necessary as long as there is no loop in the
6310 * inheritance chain.
6311 *
6312 * Ops tables are finalized when the host is started. NULL or
6313 * unspecified entries are inherited from the closet ancestor
6314 * which has the method and the entry is populated with it.
6315 * After finalization, the ops table directly points to all the
6316 * methods and ->inherits is no longer necessary and cleared.
6317 *
6318 * Using ATA_OP_NULL, inheriting ops can force a method to NULL.
6319 *
6320 * LOCKING:
6321 * None.
6322 */
6323 static void ata_finalize_port_ops(struct ata_port_operations *ops)
6324 {
6325 static DEFINE_SPINLOCK(lock);
6326 const struct ata_port_operations *cur;
6327 void **begin = (void **)ops;
6328 void **end = (void **)&ops->inherits;
6329 void **pp;
6330
6331 if (!ops || !ops->inherits)
6332 return;
6333
6334 spin_lock(&lock);
6335
6336 for (cur = ops->inherits; cur; cur = cur->inherits) {
6337 void **inherit = (void **)cur;
6338
6339 for (pp = begin; pp < end; pp++, inherit++)
6340 if (!*pp)
6341 *pp = *inherit;
6342 }
6343
6344 for (pp = begin; pp < end; pp++)
6345 if (IS_ERR(*pp))
6346 *pp = NULL;
6347
6348 ops->inherits = NULL;
6349
6350 spin_unlock(&lock);
6351 }
6352
6353 /**
6354 * ata_host_start - start and freeze ports of an ATA host
6355 * @host: ATA host to start ports for
6356 *
6357 * Start and then freeze ports of @host. Started status is
6358 * recorded in host->flags, so this function can be called
6359 * multiple times. Ports are guaranteed to get started only
6360 * once. If host->ops isn't initialized yet, its set to the
6361 * first non-dummy port ops.
6362 *
6363 * LOCKING:
6364 * Inherited from calling layer (may sleep).
6365 *
6366 * RETURNS:
6367 * 0 if all ports are started successfully, -errno otherwise.
6368 */
6369 int ata_host_start(struct ata_host *host)
6370 {
6371 int have_stop = 0;
6372 void *start_dr = NULL;
6373 int i, rc;
6374
6375 if (host->flags & ATA_HOST_STARTED)
6376 return 0;
6377
6378 ata_finalize_port_ops(host->ops);
6379
6380 for (i = 0; i < host->n_ports; i++) {
6381 struct ata_port *ap = host->ports[i];
6382
6383 ata_finalize_port_ops(ap->ops);
6384
6385 if (!host->ops && !ata_port_is_dummy(ap))
6386 host->ops = ap->ops;
6387
6388 if (ap->ops->port_stop)
6389 have_stop = 1;
6390 }
6391
6392 if (host->ops->host_stop)
6393 have_stop = 1;
6394
6395 if (have_stop) {
6396 start_dr = devres_alloc(ata_host_stop, 0, GFP_KERNEL);
6397 if (!start_dr)
6398 return -ENOMEM;
6399 }
6400
6401 for (i = 0; i < host->n_ports; i++) {
6402 struct ata_port *ap = host->ports[i];
6403
6404 if (ap->ops->port_start) {
6405 rc = ap->ops->port_start(ap);
6406 if (rc) {
6407 if (rc != -ENODEV)
6408 dev_err(host->dev,
6409 "failed to start port %d (errno=%d)\n",
6410 i, rc);
6411 goto err_out;
6412 }
6413 }
6414 ata_eh_freeze_port(ap);
6415 }
6416
6417 if (start_dr)
6418 devres_add(host->dev, start_dr);
6419 host->flags |= ATA_HOST_STARTED;
6420 return 0;
6421
6422 err_out:
6423 while (--i >= 0) {
6424 struct ata_port *ap = host->ports[i];
6425
6426 if (ap->ops->port_stop)
6427 ap->ops->port_stop(ap);
6428 }
6429 devres_free(start_dr);
6430 return rc;
6431 }
6432
6433 /**
6434 * ata_sas_host_init - Initialize a host struct for sas (ipr, libsas)
6435 * @host: host to initialize
6436 * @dev: device host is attached to
6437 * @ops: port_ops
6438 *
6439 */
6440 void ata_host_init(struct ata_host *host, struct device *dev,
6441 struct ata_port_operations *ops)
6442 {
6443 spin_lock_init(&host->lock);
6444 mutex_init(&host->eh_mutex);
6445 host->n_tags = ATA_MAX_QUEUE;
6446 host->dev = dev;
6447 host->ops = ops;
6448 kref_init(&host->kref);
6449 }
6450
6451 void __ata_port_probe(struct ata_port *ap)
6452 {
6453 struct ata_eh_info *ehi = &ap->link.eh_info;
6454 unsigned long flags;
6455
6456 /* kick EH for boot probing */
6457 spin_lock_irqsave(ap->lock, flags);
6458
6459 ehi->probe_mask |= ATA_ALL_DEVICES;
6460 ehi->action |= ATA_EH_RESET;
6461 ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
6462
6463 ap->pflags &= ~ATA_PFLAG_INITIALIZING;
6464 ap->pflags |= ATA_PFLAG_LOADING;
6465 ata_port_schedule_eh(ap);
6466
6467 spin_unlock_irqrestore(ap->lock, flags);
6468 }
6469
6470 int ata_port_probe(struct ata_port *ap)
6471 {
6472 int rc = 0;
6473
6474 if (ap->ops->error_handler) {
6475 __ata_port_probe(ap);
6476 ata_port_wait_eh(ap);
6477 } else {
6478 DPRINTK("ata%u: bus probe begin\n", ap->print_id);
6479 rc = ata_bus_probe(ap);
6480 DPRINTK("ata%u: bus probe end\n", ap->print_id);
6481 }
6482 return rc;
6483 }
6484
6485
6486 static void async_port_probe(void *data, async_cookie_t cookie)
6487 {
6488 struct ata_port *ap = data;
6489
6490 /*
6491 * If we're not allowed to scan this host in parallel,
6492 * we need to wait until all previous scans have completed
6493 * before going further.
6494 * Jeff Garzik says this is only within a controller, so we
6495 * don't need to wait for port 0, only for later ports.
6496 */
6497 if (!(ap->host->flags & ATA_HOST_PARALLEL_SCAN) && ap->port_no != 0)
6498 async_synchronize_cookie(cookie);
6499
6500 (void)ata_port_probe(ap);
6501
6502 /* in order to keep device order, we need to synchronize at this point */
6503 async_synchronize_cookie(cookie);
6504
6505 ata_scsi_scan_host(ap, 1);
6506 }
6507
6508 /**
6509 * ata_host_register - register initialized ATA host
6510 * @host: ATA host to register
6511 * @sht: template for SCSI host
6512 *
6513 * Register initialized ATA host. @host is allocated using
6514 * ata_host_alloc() and fully initialized by LLD. This function
6515 * starts ports, registers @host with ATA and SCSI layers and
6516 * probe registered devices.
6517 *
6518 * LOCKING:
6519 * Inherited from calling layer (may sleep).
6520 *
6521 * RETURNS:
6522 * 0 on success, -errno otherwise.
6523 */
6524 int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
6525 {
6526 int i, rc;
6527
6528 host->n_tags = clamp(sht->can_queue, 1, ATA_MAX_QUEUE);
6529
6530 /* host must have been started */
6531 if (!(host->flags & ATA_HOST_STARTED)) {
6532 dev_err(host->dev, "BUG: trying to register unstarted host\n");
6533 WARN_ON(1);
6534 return -EINVAL;
6535 }
6536
6537 /* Blow away unused ports. This happens when LLD can't
6538 * determine the exact number of ports to allocate at
6539 * allocation time.
6540 */
6541 for (i = host->n_ports; host->ports[i]; i++)
6542 kfree(host->ports[i]);
6543
6544 /* give ports names and add SCSI hosts */
6545 for (i = 0; i < host->n_ports; i++) {
6546 host->ports[i]->print_id = atomic_inc_return(&ata_print_id);
6547 host->ports[i]->local_port_no = i + 1;
6548 }
6549
6550 /* Create associated sysfs transport objects */
6551 for (i = 0; i < host->n_ports; i++) {
6552 rc = ata_tport_add(host->dev,host->ports[i]);
6553 if (rc) {
6554 goto err_tadd;
6555 }
6556 }
6557
6558 rc = ata_scsi_add_hosts(host, sht);
6559 if (rc)
6560 goto err_tadd;
6561
6562 /* set cable, sata_spd_limit and report */
6563 for (i = 0; i < host->n_ports; i++) {
6564 struct ata_port *ap = host->ports[i];
6565 unsigned long xfer_mask;
6566
6567 /* set SATA cable type if still unset */
6568 if (ap->cbl == ATA_CBL_NONE && (ap->flags & ATA_FLAG_SATA))
6569 ap->cbl = ATA_CBL_SATA;
6570
6571 /* init sata_spd_limit to the current value */
6572 sata_link_init_spd(&ap->link);
6573 if (ap->slave_link)
6574 sata_link_init_spd(ap->slave_link);
6575
6576 /* print per-port info to dmesg */
6577 xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
6578 ap->udma_mask);
6579
6580 if (!ata_port_is_dummy(ap)) {
6581 ata_port_info(ap, "%cATA max %s %s\n",
6582 (ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
6583 ata_mode_string(xfer_mask),
6584 ap->link.eh_info.desc);
6585 ata_ehi_clear_desc(&ap->link.eh_info);
6586 } else
6587 ata_port_info(ap, "DUMMY\n");
6588 }
6589
6590 /* perform each probe asynchronously */
6591 for (i = 0; i < host->n_ports; i++) {
6592 struct ata_port *ap = host->ports[i];
6593 ap->cookie = async_schedule(async_port_probe, ap);
6594 }
6595
6596 return 0;
6597
6598 err_tadd:
6599 while (--i >= 0) {
6600 ata_tport_delete(host->ports[i]);
6601 }
6602 return rc;
6603
6604 }
6605
6606 /**
6607 * ata_host_activate - start host, request IRQ and register it
6608 * @host: target ATA host
6609 * @irq: IRQ to request
6610 * @irq_handler: irq_handler used when requesting IRQ
6611 * @irq_flags: irq_flags used when requesting IRQ
6612 * @sht: scsi_host_template to use when registering the host
6613 *
6614 * After allocating an ATA host and initializing it, most libata
6615 * LLDs perform three steps to activate the host - start host,
6616 * request IRQ and register it. This helper takes necessary
6617 * arguments and performs the three steps in one go.
6618 *
6619 * An invalid IRQ skips the IRQ registration and expects the host to
6620 * have set polling mode on the port. In this case, @irq_handler
6621 * should be NULL.
6622 *
6623 * LOCKING:
6624 * Inherited from calling layer (may sleep).
6625 *
6626 * RETURNS:
6627 * 0 on success, -errno otherwise.
6628 */
6629 int ata_host_activate(struct ata_host *host, int irq,
6630 irq_handler_t irq_handler, unsigned long irq_flags,
6631 struct scsi_host_template *sht)
6632 {
6633 int i, rc;
6634 char *irq_desc;
6635
6636 rc = ata_host_start(host);
6637 if (rc)
6638 return rc;
6639
6640 /* Special case for polling mode */
6641 if (!irq) {
6642 WARN_ON(irq_handler);
6643 return ata_host_register(host, sht);
6644 }
6645
6646 irq_desc = devm_kasprintf(host->dev, GFP_KERNEL, "%s[%s]",
6647 dev_driver_string(host->dev),
6648 dev_name(host->dev));
6649 if (!irq_desc)
6650 return -ENOMEM;
6651
6652 rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
6653 irq_desc, host);
6654 if (rc)
6655 return rc;
6656
6657 for (i = 0; i < host->n_ports; i++)
6658 ata_port_desc(host->ports[i], "irq %d", irq);
6659
6660 rc = ata_host_register(host, sht);
6661 /* if failed, just free the IRQ and leave ports alone */
6662 if (rc)
6663 devm_free_irq(host->dev, irq, host);
6664
6665 return rc;
6666 }
6667
6668 /**
6669 * ata_port_detach - Detach ATA port in preparation of device removal
6670 * @ap: ATA port to be detached
6671 *
6672 * Detach all ATA devices and the associated SCSI devices of @ap;
6673 * then, remove the associated SCSI host. @ap is guaranteed to
6674 * be quiescent on return from this function.
6675 *
6676 * LOCKING:
6677 * Kernel thread context (may sleep).
6678 */
6679 static void ata_port_detach(struct ata_port *ap)
6680 {
6681 unsigned long flags;
6682 struct ata_link *link;
6683 struct ata_device *dev;
6684
6685 if (!ap->ops->error_handler)
6686 goto skip_eh;
6687
6688 /* tell EH we're leaving & flush EH */
6689 spin_lock_irqsave(ap->lock, flags);
6690 ap->pflags |= ATA_PFLAG_UNLOADING;
6691 ata_port_schedule_eh(ap);
6692 spin_unlock_irqrestore(ap->lock, flags);
6693
6694 /* wait till EH commits suicide */
6695 ata_port_wait_eh(ap);
6696
6697 /* it better be dead now */
6698 WARN_ON(!(ap->pflags & ATA_PFLAG_UNLOADED));
6699
6700 cancel_delayed_work_sync(&ap->hotplug_task);
6701
6702 skip_eh:
6703 /* clean up zpodd on port removal */
6704 ata_for_each_link(link, ap, HOST_FIRST) {
6705 ata_for_each_dev(dev, link, ALL) {
6706 if (zpodd_dev_enabled(dev))
6707 zpodd_exit(dev);
6708 }
6709 }
6710 if (ap->pmp_link) {
6711 int i;
6712 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
6713 ata_tlink_delete(&ap->pmp_link[i]);
6714 }
6715 /* remove the associated SCSI host */
6716 scsi_remove_host(ap->scsi_host);
6717 ata_tport_delete(ap);
6718 }
6719
6720 /**
6721 * ata_host_detach - Detach all ports of an ATA host
6722 * @host: Host to detach
6723 *
6724 * Detach all ports of @host.
6725 *
6726 * LOCKING:
6727 * Kernel thread context (may sleep).
6728 */
6729 void ata_host_detach(struct ata_host *host)
6730 {
6731 int i;
6732
6733 for (i = 0; i < host->n_ports; i++) {
6734 /* Ensure ata_port probe has completed */
6735 async_synchronize_cookie(host->ports[i]->cookie + 1);
6736 ata_port_detach(host->ports[i]);
6737 }
6738
6739 /* the host is dead now, dissociate ACPI */
6740 ata_acpi_dissociate(host);
6741 }
6742
6743 #ifdef CONFIG_PCI
6744
6745 /**
6746 * ata_pci_remove_one - PCI layer callback for device removal
6747 * @pdev: PCI device that was removed
6748 *
6749 * PCI layer indicates to libata via this hook that hot-unplug or
6750 * module unload event has occurred. Detach all ports. Resource
6751 * release is handled via devres.
6752 *
6753 * LOCKING:
6754 * Inherited from PCI layer (may sleep).
6755 */
6756 void ata_pci_remove_one(struct pci_dev *pdev)
6757 {
6758 struct ata_host *host = pci_get_drvdata(pdev);
6759
6760 ata_host_detach(host);
6761 }
6762
6763 void ata_pci_shutdown_one(struct pci_dev *pdev)
6764 {
6765 struct ata_host *host = pci_get_drvdata(pdev);
6766 int i;
6767
6768 for (i = 0; i < host->n_ports; i++) {
6769 struct ata_port *ap = host->ports[i];
6770
6771 ap->pflags |= ATA_PFLAG_FROZEN;
6772
6773 /* Disable port interrupts */
6774 if (ap->ops->freeze)
6775 ap->ops->freeze(ap);
6776
6777 /* Stop the port DMA engines */
6778 if (ap->ops->port_stop)
6779 ap->ops->port_stop(ap);
6780 }
6781 }
6782
6783 /* move to PCI subsystem */
6784 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
6785 {
6786 unsigned long tmp = 0;
6787
6788 switch (bits->width) {
6789 case 1: {
6790 u8 tmp8 = 0;
6791 pci_read_config_byte(pdev, bits->reg, &tmp8);
6792 tmp = tmp8;
6793 break;
6794 }
6795 case 2: {
6796 u16 tmp16 = 0;
6797 pci_read_config_word(pdev, bits->reg, &tmp16);
6798 tmp = tmp16;
6799 break;
6800 }
6801 case 4: {
6802 u32 tmp32 = 0;
6803 pci_read_config_dword(pdev, bits->reg, &tmp32);
6804 tmp = tmp32;
6805 break;
6806 }
6807
6808 default:
6809 return -EINVAL;
6810 }
6811
6812 tmp &= bits->mask;
6813
6814 return (tmp == bits->val) ? 1 : 0;
6815 }
6816
6817 #ifdef CONFIG_PM
6818 void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
6819 {
6820 pci_save_state(pdev);
6821 pci_disable_device(pdev);
6822
6823 if (mesg.event & PM_EVENT_SLEEP)
6824 pci_set_power_state(pdev, PCI_D3hot);
6825 }
6826
6827 int ata_pci_device_do_resume(struct pci_dev *pdev)
6828 {
6829 int rc;
6830
6831 pci_set_power_state(pdev, PCI_D0);
6832 pci_restore_state(pdev);
6833
6834 rc = pcim_enable_device(pdev);
6835 if (rc) {
6836 dev_err(&pdev->dev,
6837 "failed to enable device after resume (%d)\n", rc);
6838 return rc;
6839 }
6840
6841 pci_set_master(pdev);
6842 return 0;
6843 }
6844
6845 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6846 {
6847 struct ata_host *host = pci_get_drvdata(pdev);
6848 int rc = 0;
6849
6850 rc = ata_host_suspend(host, mesg);
6851 if (rc)
6852 return rc;
6853
6854 ata_pci_device_do_suspend(pdev, mesg);
6855
6856 return 0;
6857 }
6858
6859 int ata_pci_device_resume(struct pci_dev *pdev)
6860 {
6861 struct ata_host *host = pci_get_drvdata(pdev);
6862 int rc;
6863
6864 rc = ata_pci_device_do_resume(pdev);
6865 if (rc == 0)
6866 ata_host_resume(host);
6867 return rc;
6868 }
6869 #endif /* CONFIG_PM */
6870
6871 #endif /* CONFIG_PCI */
6872
6873 /**
6874 * ata_platform_remove_one - Platform layer callback for device removal
6875 * @pdev: Platform device that was removed
6876 *
6877 * Platform layer indicates to libata via this hook that hot-unplug or
6878 * module unload event has occurred. Detach all ports. Resource
6879 * release is handled via devres.
6880 *
6881 * LOCKING:
6882 * Inherited from platform layer (may sleep).
6883 */
6884 int ata_platform_remove_one(struct platform_device *pdev)
6885 {
6886 struct ata_host *host = platform_get_drvdata(pdev);
6887
6888 ata_host_detach(host);
6889
6890 return 0;
6891 }
6892
6893 static int __init ata_parse_force_one(char **cur,
6894 struct ata_force_ent *force_ent,
6895 const char **reason)
6896 {
6897 static const struct ata_force_param force_tbl[] __initconst = {
6898 { "40c", .cbl = ATA_CBL_PATA40 },
6899 { "80c", .cbl = ATA_CBL_PATA80 },
6900 { "short40c", .cbl = ATA_CBL_PATA40_SHORT },
6901 { "unk", .cbl = ATA_CBL_PATA_UNK },
6902 { "ign", .cbl = ATA_CBL_PATA_IGN },
6903 { "sata", .cbl = ATA_CBL_SATA },
6904 { "1.5Gbps", .spd_limit = 1 },
6905 { "3.0Gbps", .spd_limit = 2 },
6906 { "noncq", .horkage_on = ATA_HORKAGE_NONCQ },
6907 { "ncq", .horkage_off = ATA_HORKAGE_NONCQ },
6908 { "noncqtrim", .horkage_on = ATA_HORKAGE_NO_NCQ_TRIM },
6909 { "ncqtrim", .horkage_off = ATA_HORKAGE_NO_NCQ_TRIM },
6910 { "dump_id", .horkage_on = ATA_HORKAGE_DUMP_ID },
6911 { "pio0", .xfer_mask = 1 << (ATA_SHIFT_PIO + 0) },
6912 { "pio1", .xfer_mask = 1 << (ATA_SHIFT_PIO + 1) },
6913 { "pio2", .xfer_mask = 1 << (ATA_SHIFT_PIO + 2) },
6914 { "pio3", .xfer_mask = 1 << (ATA_SHIFT_PIO + 3) },
6915 { "pio4", .xfer_mask = 1 << (ATA_SHIFT_PIO + 4) },
6916 { "pio5", .xfer_mask = 1 << (ATA_SHIFT_PIO + 5) },
6917 { "pio6", .xfer_mask = 1 << (ATA_SHIFT_PIO + 6) },
6918 { "mwdma0", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 0) },
6919 { "mwdma1", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 1) },
6920 { "mwdma2", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 2) },
6921 { "mwdma3", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 3) },
6922 { "mwdma4", .xfer_mask = 1 << (ATA_SHIFT_MWDMA + 4) },
6923 { "udma0", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 0) },
6924 { "udma16", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 0) },
6925 { "udma/16", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 0) },
6926 { "udma1", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 1) },
6927 { "udma25", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 1) },
6928 { "udma/25", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 1) },
6929 { "udma2", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 2) },
6930 { "udma33", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 2) },
6931 { "udma/33", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 2) },
6932 { "udma3", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 3) },
6933 { "udma44", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 3) },
6934 { "udma/44", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 3) },
6935 { "udma4", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 4) },
6936 { "udma66", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 4) },
6937 { "udma/66", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 4) },
6938 { "udma5", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 5) },
6939 { "udma100", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 5) },
6940 { "udma/100", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 5) },
6941 { "udma6", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) },
6942 { "udma133", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) },
6943 { "udma/133", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 6) },
6944 { "udma7", .xfer_mask = 1 << (ATA_SHIFT_UDMA + 7) },
6945 { "nohrst", .lflags = ATA_LFLAG_NO_HRST },
6946 { "nosrst", .lflags = ATA_LFLAG_NO_SRST },
6947 { "norst", .lflags = ATA_LFLAG_NO_HRST | ATA_LFLAG_NO_SRST },
6948 { "rstonce", .lflags = ATA_LFLAG_RST_ONCE },
6949 { "atapi_dmadir", .horkage_on = ATA_HORKAGE_ATAPI_DMADIR },
6950 { "disable", .horkage_on = ATA_HORKAGE_DISABLE },
6951 };
6952 char *start = *cur, *p = *cur;
6953 char *id, *val, *endp;
6954 const struct ata_force_param *match_fp = NULL;
6955 int nr_matches = 0, i;
6956
6957 /* find where this param ends and update *cur */
6958 while (*p != '\0' && *p != ',')
6959 p++;
6960
6961 if (*p == '\0')
6962 *cur = p;
6963 else
6964 *cur = p + 1;
6965
6966 *p = '\0';
6967
6968 /* parse */
6969 p = strchr(start, ':');
6970 if (!p) {
6971 val = strstrip(start);
6972 goto parse_val;
6973 }
6974 *p = '\0';
6975
6976 id = strstrip(start);
6977 val = strstrip(p + 1);
6978
6979 /* parse id */
6980 p = strchr(id, '.');
6981 if (p) {
6982 *p++ = '\0';
6983 force_ent->device = simple_strtoul(p, &endp, 10);
6984 if (p == endp || *endp != '\0') {
6985 *reason = "invalid device";
6986 return -EINVAL;
6987 }
6988 }
6989
6990 force_ent->port = simple_strtoul(id, &endp, 10);
6991 if (id == endp || *endp != '\0') {
6992 *reason = "invalid port/link";
6993 return -EINVAL;
6994 }
6995
6996 parse_val:
6997 /* parse val, allow shortcuts so that both 1.5 and 1.5Gbps work */
6998 for (i = 0; i < ARRAY_SIZE(force_tbl); i++) {
6999 const struct ata_force_param *fp = &force_tbl[i];
7000
7001 if (strncasecmp(val, fp->name, strlen(val)))
7002 continue;
7003
7004 nr_matches++;
7005 match_fp = fp;
7006
7007 if (strcasecmp(val, fp->name) == 0) {
7008 nr_matches = 1;
7009 break;
7010 }
7011 }
7012
7013 if (!nr_matches) {
7014 *reason = "unknown value";
7015 return -EINVAL;
7016 }
7017 if (nr_matches > 1) {
7018 *reason = "ambiguous value";
7019 return -EINVAL;
7020 }
7021
7022 force_ent->param = *match_fp;
7023
7024 return 0;
7025 }
7026
7027 static void __init ata_parse_force_param(void)
7028 {
7029 int idx = 0, size = 1;
7030 int last_port = -1, last_device = -1;
7031 char *p, *cur, *next;
7032
7033 /* calculate maximum number of params and allocate force_tbl */
7034 for (p = ata_force_param_buf; *p; p++)
7035 if (*p == ',')
7036 size++;
7037
7038 ata_force_tbl = kcalloc(size, sizeof(ata_force_tbl[0]), GFP_KERNEL);
7039 if (!ata_force_tbl) {
7040 printk(KERN_WARNING "ata: failed to extend force table, "
7041 "libata.force ignored\n");
7042 return;
7043 }
7044
7045 /* parse and populate the table */
7046 for (cur = ata_force_param_buf; *cur != '\0'; cur = next) {
7047 const char *reason = "";
7048 struct ata_force_ent te = { .port = -1, .device = -1 };
7049
7050 next = cur;
7051 if (ata_parse_force_one(&next, &te, &reason)) {
7052 printk(KERN_WARNING "ata: failed to parse force "
7053 "parameter \"%s\" (%s)\n",
7054 cur, reason);
7055 continue;
7056 }
7057
7058 if (te.port == -1) {
7059 te.port = last_port;
7060 te.device = last_device;
7061 }
7062
7063 ata_force_tbl[idx++] = te;
7064
7065 last_port = te.port;
7066 last_device = te.device;
7067 }
7068
7069 ata_force_tbl_size = idx;
7070 }
7071
7072 static int __init ata_init(void)
7073 {
7074 int rc;
7075
7076 ata_parse_force_param();
7077
7078 rc = ata_sff_init();
7079 if (rc) {
7080 kfree(ata_force_tbl);
7081 return rc;
7082 }
7083
7084 libata_transport_init();
7085 ata_scsi_transport_template = ata_attach_transport();
7086 if (!ata_scsi_transport_template) {
7087 ata_sff_exit();
7088 rc = -ENOMEM;
7089 goto err_out;
7090 }
7091
7092 printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
7093 return 0;
7094
7095 err_out:
7096 return rc;
7097 }
7098
7099 static void __exit ata_exit(void)
7100 {
7101 ata_release_transport(ata_scsi_transport_template);
7102 libata_transport_exit();
7103 ata_sff_exit();
7104 kfree(ata_force_tbl);
7105 }
7106
7107 subsys_initcall(ata_init);
7108 module_exit(ata_exit);
7109
7110 static DEFINE_RATELIMIT_STATE(ratelimit, HZ / 5, 1);
7111
7112 int ata_ratelimit(void)
7113 {
7114 return __ratelimit(&ratelimit);
7115 }
7116
7117 /**
7118 * ata_msleep - ATA EH owner aware msleep
7119 * @ap: ATA port to attribute the sleep to
7120 * @msecs: duration to sleep in milliseconds
7121 *
7122 * Sleeps @msecs. If the current task is owner of @ap's EH, the
7123 * ownership is released before going to sleep and reacquired
7124 * after the sleep is complete. IOW, other ports sharing the
7125 * @ap->host will be allowed to own the EH while this task is
7126 * sleeping.
7127 *
7128 * LOCKING:
7129 * Might sleep.
7130 */
7131 void ata_msleep(struct ata_port *ap, unsigned int msecs)
7132 {
7133 bool owns_eh = ap && ap->host->eh_owner == current;
7134
7135 if (owns_eh)
7136 ata_eh_release(ap);
7137
7138 if (msecs < 20) {
7139 unsigned long usecs = msecs * USEC_PER_MSEC;
7140 usleep_range(usecs, usecs + 50);
7141 } else {
7142 msleep(msecs);
7143 }
7144
7145 if (owns_eh)
7146 ata_eh_acquire(ap);
7147 }
7148
7149 /**
7150 * ata_wait_register - wait until register value changes
7151 * @ap: ATA port to wait register for, can be NULL
7152 * @reg: IO-mapped register
7153 * @mask: Mask to apply to read register value
7154 * @val: Wait condition
7155 * @interval: polling interval in milliseconds
7156 * @timeout: timeout in milliseconds
7157 *
7158 * Waiting for some bits of register to change is a common
7159 * operation for ATA controllers. This function reads 32bit LE
7160 * IO-mapped register @reg and tests for the following condition.
7161 *
7162 * (*@reg & mask) != val
7163 *
7164 * If the condition is met, it returns; otherwise, the process is
7165 * repeated after @interval_msec until timeout.
7166 *
7167 * LOCKING:
7168 * Kernel thread context (may sleep)
7169 *
7170 * RETURNS:
7171 * The final register value.
7172 */
7173 u32 ata_wait_register(struct ata_port *ap, void __iomem *reg, u32 mask, u32 val,
7174 unsigned long interval, unsigned long timeout)
7175 {
7176 unsigned long deadline;
7177 u32 tmp;
7178
7179 tmp = ioread32(reg);
7180
7181 /* Calculate timeout _after_ the first read to make sure
7182 * preceding writes reach the controller before starting to
7183 * eat away the timeout.
7184 */
7185 deadline = ata_deadline(jiffies, timeout);
7186
7187 while ((tmp & mask) == val && time_before(jiffies, deadline)) {
7188 ata_msleep(ap, interval);
7189 tmp = ioread32(reg);
7190 }
7191
7192 return tmp;
7193 }
7194
7195 /**
7196 * sata_lpm_ignore_phy_events - test if PHY event should be ignored
7197 * @link: Link receiving the event
7198 *
7199 * Test whether the received PHY event has to be ignored or not.
7200 *
7201 * LOCKING:
7202 * None:
7203 *
7204 * RETURNS:
7205 * True if the event has to be ignored.
7206 */
7207 bool sata_lpm_ignore_phy_events(struct ata_link *link)
7208 {
7209 unsigned long lpm_timeout = link->last_lpm_change +
7210 msecs_to_jiffies(ATA_TMOUT_SPURIOUS_PHY);
7211
7212 /* if LPM is enabled, PHYRDY doesn't mean anything */
7213 if (link->lpm_policy > ATA_LPM_MAX_POWER)
7214 return true;
7215
7216 /* ignore the first PHY event after the LPM policy changed
7217 * as it is might be spurious
7218 */
7219 if ((link->flags & ATA_LFLAG_CHANGED) &&
7220 time_before(jiffies, lpm_timeout))
7221 return true;
7222
7223 return false;
7224 }
7225 EXPORT_SYMBOL_GPL(sata_lpm_ignore_phy_events);
7226
7227 /*
7228 * Dummy port_ops
7229 */
7230 static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
7231 {
7232 return AC_ERR_SYSTEM;
7233 }
7234
7235 static void ata_dummy_error_handler(struct ata_port *ap)
7236 {
7237 /* truly dummy */
7238 }
7239
7240 struct ata_port_operations ata_dummy_port_ops = {
7241 .qc_prep = ata_noop_qc_prep,
7242 .qc_issue = ata_dummy_qc_issue,
7243 .error_handler = ata_dummy_error_handler,
7244 .sched_eh = ata_std_sched_eh,
7245 .end_eh = ata_std_end_eh,
7246 };
7247
7248 const struct ata_port_info ata_dummy_port_info = {
7249 .port_ops = &ata_dummy_port_ops,
7250 };
7251
7252 /*
7253 * Utility print functions
7254 */
7255 void ata_port_printk(const struct ata_port *ap, const char *level,
7256 const char *fmt, ...)
7257 {
7258 struct va_format vaf;
7259 va_list args;
7260
7261 va_start(args, fmt);
7262
7263 vaf.fmt = fmt;
7264 vaf.va = &args;
7265
7266 printk("%sata%u: %pV", level, ap->print_id, &vaf);
7267
7268 va_end(args);
7269 }
7270 EXPORT_SYMBOL(ata_port_printk);
7271
7272 void ata_link_printk(const struct ata_link *link, const char *level,
7273 const char *fmt, ...)
7274 {
7275 struct va_format vaf;
7276 va_list args;
7277
7278 va_start(args, fmt);
7279
7280 vaf.fmt = fmt;
7281 vaf.va = &args;
7282
7283 if (sata_pmp_attached(link->ap) || link->ap->slave_link)
7284 printk("%sata%u.%02u: %pV",
7285 level, link->ap->print_id, link->pmp, &vaf);
7286 else
7287 printk("%sata%u: %pV",
7288 level, link->ap->print_id, &vaf);
7289
7290 va_end(args);
7291 }
7292 EXPORT_SYMBOL(ata_link_printk);
7293
7294 void ata_dev_printk(const struct ata_device *dev, const char *level,
7295 const char *fmt, ...)
7296 {
7297 struct va_format vaf;
7298 va_list args;
7299
7300 va_start(args, fmt);
7301
7302 vaf.fmt = fmt;
7303 vaf.va = &args;
7304
7305 printk("%sata%u.%02u: %pV",
7306 level, dev->link->ap->print_id, dev->link->pmp + dev->devno,
7307 &vaf);
7308
7309 va_end(args);
7310 }
7311 EXPORT_SYMBOL(ata_dev_printk);
7312
7313 void ata_print_version(const struct device *dev, const char *version)
7314 {
7315 dev_printk(KERN_DEBUG, dev, "version %s\n", version);
7316 }
7317 EXPORT_SYMBOL(ata_print_version);
7318
7319 /*
7320 * libata is essentially a library of internal helper functions for
7321 * low-level ATA host controller drivers. As such, the API/ABI is
7322 * likely to change as new drivers are added and updated.
7323 * Do not depend on ABI/API stability.
7324 */
7325 EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
7326 EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
7327 EXPORT_SYMBOL_GPL(sata_deb_timing_long);
7328 EXPORT_SYMBOL_GPL(ata_base_port_ops);
7329 EXPORT_SYMBOL_GPL(sata_port_ops);
7330 EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
7331 EXPORT_SYMBOL_GPL(ata_dummy_port_info);
7332 EXPORT_SYMBOL_GPL(ata_link_next);
7333 EXPORT_SYMBOL_GPL(ata_dev_next);
7334 EXPORT_SYMBOL_GPL(ata_std_bios_param);
7335 EXPORT_SYMBOL_GPL(ata_scsi_unlock_native_capacity);
7336 EXPORT_SYMBOL_GPL(ata_host_init);
7337 EXPORT_SYMBOL_GPL(ata_host_alloc);
7338 EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
7339 EXPORT_SYMBOL_GPL(ata_slave_link_init);
7340 EXPORT_SYMBOL_GPL(ata_host_start);
7341 EXPORT_SYMBOL_GPL(ata_host_register);
7342 EXPORT_SYMBOL_GPL(ata_host_activate);
7343 EXPORT_SYMBOL_GPL(ata_host_detach);
7344 EXPORT_SYMBOL_GPL(ata_sg_init);
7345 EXPORT_SYMBOL_GPL(ata_qc_complete);
7346 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
7347 EXPORT_SYMBOL_GPL(atapi_cmd_type);
7348 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
7349 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
7350 EXPORT_SYMBOL_GPL(ata_pack_xfermask);
7351 EXPORT_SYMBOL_GPL(ata_unpack_xfermask);
7352 EXPORT_SYMBOL_GPL(ata_xfer_mask2mode);
7353 EXPORT_SYMBOL_GPL(ata_xfer_mode2mask);
7354 EXPORT_SYMBOL_GPL(ata_xfer_mode2shift);
7355 EXPORT_SYMBOL_GPL(ata_mode_string);
7356 EXPORT_SYMBOL_GPL(ata_id_xfermask);
7357 EXPORT_SYMBOL_GPL(ata_do_set_mode);
7358 EXPORT_SYMBOL_GPL(ata_std_qc_defer);
7359 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
7360 EXPORT_SYMBOL_GPL(ata_dev_disable);
7361 EXPORT_SYMBOL_GPL(sata_set_spd);
7362 EXPORT_SYMBOL_GPL(ata_wait_after_reset);
7363 EXPORT_SYMBOL_GPL(sata_link_debounce);
7364 EXPORT_SYMBOL_GPL(sata_link_resume);
7365 EXPORT_SYMBOL_GPL(sata_link_scr_lpm);
7366 EXPORT_SYMBOL_GPL(ata_std_prereset);
7367 EXPORT_SYMBOL_GPL(sata_link_hardreset);
7368 EXPORT_SYMBOL_GPL(sata_std_hardreset);
7369 EXPORT_SYMBOL_GPL(ata_std_postreset);
7370 EXPORT_SYMBOL_GPL(ata_dev_classify);
7371 EXPORT_SYMBOL_GPL(ata_dev_pair);
7372 EXPORT_SYMBOL_GPL(ata_ratelimit);
7373 EXPORT_SYMBOL_GPL(ata_msleep);
7374 EXPORT_SYMBOL_GPL(ata_wait_register);
7375 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
7376 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
7377 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
7378 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
7379 EXPORT_SYMBOL_GPL(__ata_change_queue_depth);
7380 EXPORT_SYMBOL_GPL(sata_scr_valid);
7381 EXPORT_SYMBOL_GPL(sata_scr_read);
7382 EXPORT_SYMBOL_GPL(sata_scr_write);
7383 EXPORT_SYMBOL_GPL(sata_scr_write_flush);
7384 EXPORT_SYMBOL_GPL(ata_link_online);
7385 EXPORT_SYMBOL_GPL(ata_link_offline);
7386 #ifdef CONFIG_PM
7387 EXPORT_SYMBOL_GPL(ata_host_suspend);
7388 EXPORT_SYMBOL_GPL(ata_host_resume);
7389 #endif /* CONFIG_PM */
7390 EXPORT_SYMBOL_GPL(ata_id_string);
7391 EXPORT_SYMBOL_GPL(ata_id_c_string);
7392 EXPORT_SYMBOL_GPL(ata_do_dev_read_id);
7393 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
7394
7395 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
7396 EXPORT_SYMBOL_GPL(ata_timing_find_mode);
7397 EXPORT_SYMBOL_GPL(ata_timing_compute);
7398 EXPORT_SYMBOL_GPL(ata_timing_merge);
7399 EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
7400
7401 #ifdef CONFIG_PCI
7402 EXPORT_SYMBOL_GPL(pci_test_config_bits);
7403 EXPORT_SYMBOL_GPL(ata_pci_shutdown_one);
7404 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
7405 #ifdef CONFIG_PM
7406 EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
7407 EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
7408 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
7409 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
7410 #endif /* CONFIG_PM */
7411 #endif /* CONFIG_PCI */
7412
7413 EXPORT_SYMBOL_GPL(ata_platform_remove_one);
7414
7415 EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
7416 EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
7417 EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
7418 EXPORT_SYMBOL_GPL(ata_port_desc);
7419 #ifdef CONFIG_PCI
7420 EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
7421 #endif /* CONFIG_PCI */
7422 EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
7423 EXPORT_SYMBOL_GPL(ata_link_abort);
7424 EXPORT_SYMBOL_GPL(ata_port_abort);
7425 EXPORT_SYMBOL_GPL(ata_port_freeze);
7426 EXPORT_SYMBOL_GPL(sata_async_notification);
7427 EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
7428 EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
7429 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
7430 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
7431 EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error);
7432 EXPORT_SYMBOL_GPL(ata_do_eh);
7433 EXPORT_SYMBOL_GPL(ata_std_error_handler);
7434
7435 EXPORT_SYMBOL_GPL(ata_cable_40wire);
7436 EXPORT_SYMBOL_GPL(ata_cable_80wire);
7437 EXPORT_SYMBOL_GPL(ata_cable_unknown);
7438 EXPORT_SYMBOL_GPL(ata_cable_ignore);
7439 EXPORT_SYMBOL_GPL(ata_cable_sata);
7440 EXPORT_SYMBOL_GPL(ata_host_get);
7441 EXPORT_SYMBOL_GPL(ata_host_put);
Linux with added FPC-III support