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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/async.h>
45 #include <linux/log2.h>
46 #include <linux/slab.h>
47 #include <linux/glob.h>
48 #include <scsi/scsi.h>
49 #include <scsi/scsi_cmnd.h>
50 #include <scsi/scsi_host.h>
51 #include <linux/libata.h>
52 #include <asm/byteorder.h>
53 #include <asm/unaligned.h>
54 #include <linux/cdrom.h>
55 #include <linux/ratelimit.h>
56 #include <linux/leds.h>
57 #include <linux/pm_runtime.h>
58 #include <linux/platform_device.h>
59 
60 #define CREATE_TRACE_POINTS
61 #include <trace/events/libata.h>
62 
63 #include "libata.h"
64 #include "libata-transport.h"
65 
66 /* debounce timing parameters in msecs { interval, duration, timeout } */
67 const unsigned long sata_deb_timing_normal[]		= {   5,  100, 2000 };
68 const unsigned long sata_deb_timing_hotplug[]		= {  25,  500, 2000 };
69 const unsigned long sata_deb_timing_long[]		= { 100, 2000, 5000 };
70 
71 const struct ata_port_operations ata_base_port_ops = {
72 	.prereset		= ata_std_prereset,
73 	.postreset		= ata_std_postreset,
74 	.error_handler		= ata_std_error_handler,
75 	.sched_eh		= ata_std_sched_eh,
76 	.end_eh			= ata_std_end_eh,
77 };
78 
79 const struct ata_port_operations sata_port_ops = {
80 	.inherits		= &ata_base_port_ops,
81 
82 	.qc_defer		= ata_std_qc_defer,
83 	.hardreset		= sata_std_hardreset,
84 };
85 
86 static unsigned int ata_dev_init_params(struct ata_device *dev,
87 					u16 heads, u16 sectors);
88 static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
89 static void ata_dev_xfermask(struct ata_device *dev);
90 static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
91 
92 atomic_t ata_print_id = ATOMIC_INIT(0);
93 
94 struct ata_force_param {
95 	const char	*name;
96 	unsigned int	cbl;
97 	int		spd_limit;
98 	unsigned long	xfer_mask;
99 	unsigned int	horkage_on;
100 	unsigned int	horkage_off;
101 	unsigned int	lflags;
102 };
103 
104 struct ata_force_ent {
105 	int			port;
106 	int			device;
107 	struct ata_force_param	param;
108 };
109 
110 static struct ata_force_ent *ata_force_tbl;
111 static int ata_force_tbl_size;
112 
113 static char ata_force_param_buf[PAGE_SIZE] __initdata;
114 /* param_buf is thrown away after initialization, disallow read */
115 module_param_string(force, ata_force_param_buf, sizeof(ata_force_param_buf), 0);
116 MODULE_PARM_DESC(force, "Force ATA configurations including cable type, link speed and transfer mode (see Documentation/admin-guide/kernel-parameters.rst for details)");
117 
118 static int atapi_enabled = 1;
119 module_param(atapi_enabled, int, 0444);
120 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on [default])");
121 
122 static int atapi_dmadir = 0;
123 module_param(atapi_dmadir, int, 0444);
124 MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off [default], 1=on)");
125 
126 int atapi_passthru16 = 1;
127 module_param(atapi_passthru16, int, 0444);
128 MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices (0=off, 1=on [default])");
129 
130 int libata_fua = 0;
131 module_param_named(fua, libata_fua, int, 0444);
132 MODULE_PARM_DESC(fua, "FUA support (0=off [default], 1=on)");
133 
134 static int ata_ignore_hpa;
135 module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644);
136 MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore limits, using full disk)");
137 
138 static int libata_dma_mask = ATA_DMA_MASK_ATA|ATA_DMA_MASK_ATAPI|ATA_DMA_MASK_CFA;
139 module_param_named(dma, libata_dma_mask, int, 0444);
140 MODULE_PARM_DESC(dma, "DMA enable/disable (0x1==ATA, 0x2==ATAPI, 0x4==CF)");
141 
142 static int ata_probe_timeout;
143 module_param(ata_probe_timeout, int, 0444);
144 MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
145 
146 int libata_noacpi = 0;
147 module_param_named(noacpi, libata_noacpi, int, 0444);
148 MODULE_PARM_DESC(noacpi, "Disable the use of ACPI in probe/suspend/resume (0=off [default], 1=on)");
149 
150 int libata_allow_tpm = 0;
151 module_param_named(allow_tpm, libata_allow_tpm, int, 0444);
152 MODULE_PARM_DESC(allow_tpm, "Permit the use of TPM commands (0=off [default], 1=on)");
153 
154 static int atapi_an;
155 module_param(atapi_an, int, 0444);
156 MODULE_PARM_DESC(atapi_an, "Enable ATAPI AN media presence notification (0=0ff [default], 1=on)");
157 
158 MODULE_AUTHOR("Jeff Garzik");
159 MODULE_DESCRIPTION("Library module for ATA devices");
160 MODULE_LICENSE("GPL");
161 MODULE_VERSION(DRV_VERSION);
162 
163 
ata_sstatus_online(u32 sstatus)164 static bool ata_sstatus_online(u32 sstatus)
165 {
166 	return (sstatus & 0xf) == 0x3;
167 }
168 
169 /**
170  *	ata_link_next - link iteration helper
171  *	@link: the previous link, NULL to start
172  *	@ap: ATA port containing links to iterate
173  *	@mode: iteration mode, one of ATA_LITER_*
174  *
175  *	LOCKING:
176  *	Host lock or EH context.
177  *
178  *	RETURNS:
179  *	Pointer to the next link.
180  */
ata_link_next(struct ata_link * link,struct ata_port * ap,enum ata_link_iter_mode mode)181 struct ata_link *ata_link_next(struct ata_link *link, struct ata_port *ap,
182 			       enum ata_link_iter_mode mode)
183 {
184 	BUG_ON(mode != ATA_LITER_EDGE &&
185 	       mode != ATA_LITER_PMP_FIRST && mode != ATA_LITER_HOST_FIRST);
186 
187 	/* NULL link indicates start of iteration */
188 	if (!link)
189 		switch (mode) {
190 		case ATA_LITER_EDGE:
191 		case ATA_LITER_PMP_FIRST:
192 			if (sata_pmp_attached(ap))
193 				return ap->pmp_link;
194 			/* fall through */
195 		case ATA_LITER_HOST_FIRST:
196 			return &ap->link;
197 		}
198 
199 	/* we just iterated over the host link, what's next? */
200 	if (link == &ap->link)
201 		switch (mode) {
202 		case ATA_LITER_HOST_FIRST:
203 			if (sata_pmp_attached(ap))
204 				return ap->pmp_link;
205 			/* fall through */
206 		case ATA_LITER_PMP_FIRST:
207 			if (unlikely(ap->slave_link))
208 				return ap->slave_link;
209 			/* fall through */
210 		case ATA_LITER_EDGE:
211 			return NULL;
212 		}
213 
214 	/* slave_link excludes PMP */
215 	if (unlikely(link == ap->slave_link))
216 		return NULL;
217 
218 	/* we were over a PMP link */
219 	if (++link < ap->pmp_link + ap->nr_pmp_links)
220 		return link;
221 
222 	if (mode == ATA_LITER_PMP_FIRST)
223 		return &ap->link;
224 
225 	return NULL;
226 }
227 
228 /**
229  *	ata_dev_next - device iteration helper
230  *	@dev: the previous device, NULL to start
231  *	@link: ATA link containing devices to iterate
232  *	@mode: iteration mode, one of ATA_DITER_*
233  *
234  *	LOCKING:
235  *	Host lock or EH context.
236  *
237  *	RETURNS:
238  *	Pointer to the next device.
239  */
ata_dev_next(struct ata_device * dev,struct ata_link * link,enum ata_dev_iter_mode mode)240 struct ata_device *ata_dev_next(struct ata_device *dev, struct ata_link *link,
241 				enum ata_dev_iter_mode mode)
242 {
243 	BUG_ON(mode != ATA_DITER_ENABLED && mode != ATA_DITER_ENABLED_REVERSE &&
244 	       mode != ATA_DITER_ALL && mode != ATA_DITER_ALL_REVERSE);
245 
246 	/* NULL dev indicates start of iteration */
247 	if (!dev)
248 		switch (mode) {
249 		case ATA_DITER_ENABLED:
250 		case ATA_DITER_ALL:
251 			dev = link->device;
252 			goto check;
253 		case ATA_DITER_ENABLED_REVERSE:
254 		case ATA_DITER_ALL_REVERSE:
255 			dev = link->device + ata_link_max_devices(link) - 1;
256 			goto check;
257 		}
258 
259  next:
260 	/* move to the next one */
261 	switch (mode) {
262 	case ATA_DITER_ENABLED:
263 	case ATA_DITER_ALL:
264 		if (++dev < link->device + ata_link_max_devices(link))
265 			goto check;
266 		return NULL;
267 	case ATA_DITER_ENABLED_REVERSE:
268 	case ATA_DITER_ALL_REVERSE:
269 		if (--dev >= link->device)
270 			goto check;
271 		return NULL;
272 	}
273 
274  check:
275 	if ((mode == ATA_DITER_ENABLED || mode == ATA_DITER_ENABLED_REVERSE) &&
276 	    !ata_dev_enabled(dev))
277 		goto next;
278 	return dev;
279 }
280 
281 /**
282  *	ata_dev_phys_link - find physical link for a device
283  *	@dev: ATA device to look up physical link for
284  *
285  *	Look up physical link which @dev is attached to.  Note that
286  *	this is different from @dev->link only when @dev is on slave
287  *	link.  For all other cases, it's the same as @dev->link.
288  *
289  *	LOCKING:
290  *	Don't care.
291  *
292  *	RETURNS:
293  *	Pointer to the found physical link.
294  */
ata_dev_phys_link(struct ata_device * dev)295 struct ata_link *ata_dev_phys_link(struct ata_device *dev)
296 {
297 	struct ata_port *ap = dev->link->ap;
298 
299 	if (!ap->slave_link)
300 		return dev->link;
301 	if (!dev->devno)
302 		return &ap->link;
303 	return ap->slave_link;
304 }
305 
306 /**
307  *	ata_force_cbl - force cable type according to libata.force
308  *	@ap: ATA port of interest
309  *
310  *	Force cable type according to libata.force and whine about it.
311  *	The last entry which has matching port number is used, so it
312  *	can be specified as part of device force parameters.  For
313  *	example, both "a:40c,1.00:udma4" and "1.00:40c,udma4" have the
314  *	same effect.
315  *
316  *	LOCKING:
317  *	EH context.
318  */
ata_force_cbl(struct ata_port * ap)319 void ata_force_cbl(struct ata_port *ap)
320 {
321 	int i;
322 
323 	for (i = ata_force_tbl_size - 1; i >= 0; i--) {
324 		const struct ata_force_ent *fe = &ata_force_tbl[i];
325 
326 		if (fe->port != -1 && fe->port != ap->print_id)
327 			continue;
328 
329 		if (fe->param.cbl == ATA_CBL_NONE)
330 			continue;
331 
332 		ap->cbl = fe->param.cbl;
333 		ata_port_notice(ap, "FORCE: cable set to %s\n", fe->param.name);
334 		return;
335 	}
336 }
337 
338 /**
339  *	ata_force_link_limits - force link limits according to libata.force
340  *	@link: ATA link of interest
341  *
342  *	Force link flags and SATA spd limit according to libata.force
343  *	and whine about it.  When only the port part is specified
344  *	(e.g. 1:), the limit applies to all links connected to both
345  *	the host link and all fan-out ports connected via PMP.  If the
346  *	device part is specified as 0 (e.g. 1.00:), it specifies the
347  *	first fan-out link not the host link.  Device number 15 always
348  *	points to the host link whether PMP is attached or not.  If the
349  *	controller has slave link, device number 16 points to it.
350  *
351  *	LOCKING:
352  *	EH context.
353  */
ata_force_link_limits(struct ata_link * link)354 static void ata_force_link_limits(struct ata_link *link)
355 {
356 	bool did_spd = false;
357 	int linkno = link->pmp;
358 	int i;
359 
360 	if (ata_is_host_link(link))
361 		linkno += 15;
362 
363 	for (i = ata_force_tbl_size - 1; i >= 0; i--) {
364 		const struct ata_force_ent *fe = &ata_force_tbl[i];
365 
366 		if (fe->port != -1 && fe->port != link->ap->print_id)
367 			continue;
368 
369 		if (fe->device != -1 && fe->device != linkno)
370 			continue;
371 
372 		/* only honor the first spd limit */
373 		if (!did_spd && fe->param.spd_limit) {
374 			link->hw_sata_spd_limit = (1 << fe->param.spd_limit) - 1;
375 			ata_link_notice(link, "FORCE: PHY spd limit set to %s\n",
376 					fe->param.name);
377 			did_spd = true;
378 		}
379 
380 		/* let lflags stack */
381 		if (fe->param.lflags) {
382 			link->flags |= fe->param.lflags;
383 			ata_link_notice(link,
384 					"FORCE: link flag 0x%x forced -> 0x%x\n",
385 					fe->param.lflags, link->flags);
386 		}
387 	}
388 }
389 
390 /**
391  *	ata_force_xfermask - force xfermask according to libata.force
392  *	@dev: ATA device of interest
393  *
394  *	Force xfer_mask according to libata.force and whine about it.
395  *	For consistency with link selection, device number 15 selects
396  *	the first device connected to the host link.
397  *
398  *	LOCKING:
399  *	EH context.
400  */
ata_force_xfermask(struct ata_device * dev)401 static void ata_force_xfermask(struct ata_device *dev)
402 {
403 	int devno = dev->link->pmp + dev->devno;
404 	int alt_devno = devno;
405 	int i;
406 
407 	/* allow n.15/16 for devices attached to host port */
408 	if (ata_is_host_link(dev->link))
409 		alt_devno += 15;
410 
411 	for (i = ata_force_tbl_size - 1; i >= 0; i--) {
412 		const struct ata_force_ent *fe = &ata_force_tbl[i];
413 		unsigned long pio_mask, mwdma_mask, udma_mask;
414 
415 		if (fe->port != -1 && fe->port != dev->link->ap->print_id)
416 			continue;
417 
418 		if (fe->device != -1 && fe->device != devno &&
419 		    fe->device != alt_devno)
420 			continue;
421 
422 		if (!fe->param.xfer_mask)
423 			continue;
424 
425 		ata_unpack_xfermask(fe->param.xfer_mask,
426 				    &pio_mask, &mwdma_mask, &udma_mask);
427 		if (udma_mask)
428 			dev->udma_mask = udma_mask;
429 		else if (mwdma_mask) {
430 			dev->udma_mask = 0;
431 			dev->mwdma_mask = mwdma_mask;
432 		} else {
433 			dev->udma_mask = 0;
434 			dev->mwdma_mask = 0;
435 			dev->pio_mask = pio_mask;
436 		}
437 
438 		ata_dev_notice(dev, "FORCE: xfer_mask set to %s\n",
439 			       fe->param.name);
440 		return;
441 	}
442 }
443 
444 /**
445  *	ata_force_horkage - force horkage according to libata.force
446  *	@dev: ATA device of interest
447  *
448  *	Force horkage according to libata.force and whine about it.
449  *	For consistency with link selection, device number 15 selects
450  *	the first device connected to the host link.
451  *
452  *	LOCKING:
453  *	EH context.
454  */
ata_force_horkage(struct ata_device * dev)455 static void ata_force_horkage(struct ata_device *dev)
456 {
457 	int devno = dev->link->pmp + dev->devno;
458 	int alt_devno = devno;
459 	int i;
460 
461 	/* allow n.15/16 for devices attached to host port */
462 	if (ata_is_host_link(dev->link))
463 		alt_devno += 15;
464 
465 	for (i = 0; i < ata_force_tbl_size; i++) {
466 		const struct ata_force_ent *fe = &ata_force_tbl[i];
467 
468 		if (fe->port != -1 && fe->port != dev->link->ap->print_id)
469 			continue;
470 
471 		if (fe->device != -1 && fe->device != devno &&
472 		    fe->device != alt_devno)
473 			continue;
474 
475 		if (!(~dev->horkage & fe->param.horkage_on) &&
476 		    !(dev->horkage & fe->param.horkage_off))
477 			continue;
478 
479 		dev->horkage |= fe->param.horkage_on;
480 		dev->horkage &= ~fe->param.horkage_off;
481 
482 		ata_dev_notice(dev, "FORCE: horkage modified (%s)\n",
483 			       fe->param.name);
484 	}
485 }
486 
487 /**
488  *	atapi_cmd_type - Determine ATAPI command type from SCSI opcode
489  *	@opcode: SCSI opcode
490  *
491  *	Determine ATAPI command type from @opcode.
492  *
493  *	LOCKING:
494  *	None.
495  *
496  *	RETURNS:
497  *	ATAPI_{READ|WRITE|READ_CD|PASS_THRU|MISC}
498  */
atapi_cmd_type(u8 opcode)499 int atapi_cmd_type(u8 opcode)
500 {
501 	switch (opcode) {
502 	case GPCMD_READ_10:
503 	case GPCMD_READ_12:
504 		return ATAPI_READ;
505 
506 	case GPCMD_WRITE_10:
507 	case GPCMD_WRITE_12:
508 	case GPCMD_WRITE_AND_VERIFY_10:
509 		return ATAPI_WRITE;
510 
511 	case GPCMD_READ_CD:
512 	case GPCMD_READ_CD_MSF:
513 		return ATAPI_READ_CD;
514 
515 	case ATA_16:
516 	case ATA_12:
517 		if (atapi_passthru16)
518 			return ATAPI_PASS_THRU;
519 		/* fall thru */
520 	default:
521 		return ATAPI_MISC;
522 	}
523 }
524 
525 /**
526  *	ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
527  *	@tf: Taskfile to convert
528  *	@pmp: Port multiplier port
529  *	@is_cmd: This FIS is for command
530  *	@fis: Buffer into which data will output
531  *
532  *	Converts a standard ATA taskfile to a Serial ATA
533  *	FIS structure (Register - Host to Device).
534  *
535  *	LOCKING:
536  *	Inherited from caller.
537  */
ata_tf_to_fis(const struct ata_taskfile * tf,u8 pmp,int is_cmd,u8 * fis)538 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
539 {
540 	fis[0] = 0x27;			/* Register - Host to Device FIS */
541 	fis[1] = pmp & 0xf;		/* Port multiplier number*/
542 	if (is_cmd)
543 		fis[1] |= (1 << 7);	/* bit 7 indicates Command FIS */
544 
545 	fis[2] = tf->command;
546 	fis[3] = tf->feature;
547 
548 	fis[4] = tf->lbal;
549 	fis[5] = tf->lbam;
550 	fis[6] = tf->lbah;
551 	fis[7] = tf->device;
552 
553 	fis[8] = tf->hob_lbal;
554 	fis[9] = tf->hob_lbam;
555 	fis[10] = tf->hob_lbah;
556 	fis[11] = tf->hob_feature;
557 
558 	fis[12] = tf->nsect;
559 	fis[13] = tf->hob_nsect;
560 	fis[14] = 0;
561 	fis[15] = tf->ctl;
562 
563 	fis[16] = tf->auxiliary & 0xff;
564 	fis[17] = (tf->auxiliary >> 8) & 0xff;
565 	fis[18] = (tf->auxiliary >> 16) & 0xff;
566 	fis[19] = (tf->auxiliary >> 24) & 0xff;
567 }
568 
569 /**
570  *	ata_tf_from_fis - Convert SATA FIS to ATA taskfile
571  *	@fis: Buffer from which data will be input
572  *	@tf: Taskfile to output
573  *
574  *	Converts a serial ATA FIS structure to a standard ATA taskfile.
575  *
576  *	LOCKING:
577  *	Inherited from caller.
578  */
579 
ata_tf_from_fis(const u8 * fis,struct ata_taskfile * tf)580 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
581 {
582 	tf->command	= fis[2];	/* status */
583 	tf->feature	= fis[3];	/* error */
584 
585 	tf->lbal	= fis[4];
586 	tf->lbam	= fis[5];
587 	tf->lbah	= fis[6];
588 	tf->device	= fis[7];
589 
590 	tf->hob_lbal	= fis[8];
591 	tf->hob_lbam	= fis[9];
592 	tf->hob_lbah	= fis[10];
593 
594 	tf->nsect	= fis[12];
595 	tf->hob_nsect	= fis[13];
596 }
597 
598 static const u8 ata_rw_cmds[] = {
599 	/* pio multi */
600 	ATA_CMD_READ_MULTI,
601 	ATA_CMD_WRITE_MULTI,
602 	ATA_CMD_READ_MULTI_EXT,
603 	ATA_CMD_WRITE_MULTI_EXT,
604 	0,
605 	0,
606 	0,
607 	ATA_CMD_WRITE_MULTI_FUA_EXT,
608 	/* pio */
609 	ATA_CMD_PIO_READ,
610 	ATA_CMD_PIO_WRITE,
611 	ATA_CMD_PIO_READ_EXT,
612 	ATA_CMD_PIO_WRITE_EXT,
613 	0,
614 	0,
615 	0,
616 	0,
617 	/* dma */
618 	ATA_CMD_READ,
619 	ATA_CMD_WRITE,
620 	ATA_CMD_READ_EXT,
621 	ATA_CMD_WRITE_EXT,
622 	0,
623 	0,
624 	0,
625 	ATA_CMD_WRITE_FUA_EXT
626 };
627 
628 /**
629  *	ata_rwcmd_protocol - set taskfile r/w commands and protocol
630  *	@tf: command to examine and configure
631  *	@dev: device tf belongs to
632  *
633  *	Examine the device configuration and tf->flags to calculate
634  *	the proper read/write commands and protocol to use.
635  *
636  *	LOCKING:
637  *	caller.
638  */
ata_rwcmd_protocol(struct ata_taskfile * tf,struct ata_device * dev)639 static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
640 {
641 	u8 cmd;
642 
643 	int index, fua, lba48, write;
644 
645 	fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
646 	lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
647 	write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
648 
649 	if (dev->flags & ATA_DFLAG_PIO) {
650 		tf->protocol = ATA_PROT_PIO;
651 		index = dev->multi_count ? 0 : 8;
652 	} else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
653 		/* Unable to use DMA due to host limitation */
654 		tf->protocol = ATA_PROT_PIO;
655 		index = dev->multi_count ? 0 : 8;
656 	} else {
657 		tf->protocol = ATA_PROT_DMA;
658 		index = 16;
659 	}
660 
661 	cmd = ata_rw_cmds[index + fua + lba48 + write];
662 	if (cmd) {
663 		tf->command = cmd;
664 		return 0;
665 	}
666 	return -1;
667 }
668 
669 /**
670  *	ata_tf_read_block - Read block address from ATA taskfile
671  *	@tf: ATA taskfile of interest
672  *	@dev: ATA device @tf belongs to
673  *
674  *	LOCKING:
675  *	None.
676  *
677  *	Read block address from @tf.  This function can handle all
678  *	three address formats - LBA, LBA48 and CHS.  tf->protocol and
679  *	flags select the address format to use.
680  *
681  *	RETURNS:
682  *	Block address read from @tf.
683  */
ata_tf_read_block(const struct ata_taskfile * tf,struct ata_device * dev)684 u64 ata_tf_read_block(const struct ata_taskfile *tf, struct ata_device *dev)
685 {
686 	u64 block = 0;
687 
688 	if (tf->flags & ATA_TFLAG_LBA) {
689 		if (tf->flags & ATA_TFLAG_LBA48) {
690 			block |= (u64)tf->hob_lbah << 40;
691 			block |= (u64)tf->hob_lbam << 32;
692 			block |= (u64)tf->hob_lbal << 24;
693 		} else
694 			block |= (tf->device & 0xf) << 24;
695 
696 		block |= tf->lbah << 16;
697 		block |= tf->lbam << 8;
698 		block |= tf->lbal;
699 	} else {
700 		u32 cyl, head, sect;
701 
702 		cyl = tf->lbam | (tf->lbah << 8);
703 		head = tf->device & 0xf;
704 		sect = tf->lbal;
705 
706 		if (!sect) {
707 			ata_dev_warn(dev,
708 				     "device reported invalid CHS sector 0\n");
709 			return U64_MAX;
710 		}
711 
712 		block = (cyl * dev->heads + head) * dev->sectors + sect - 1;
713 	}
714 
715 	return block;
716 }
717 
718 /**
719  *	ata_build_rw_tf - Build ATA taskfile for given read/write request
720  *	@tf: Target ATA taskfile
721  *	@dev: ATA device @tf belongs to
722  *	@block: Block address
723  *	@n_block: Number of blocks
724  *	@tf_flags: RW/FUA etc...
725  *	@tag: tag
726  *	@class: IO priority class
727  *
728  *	LOCKING:
729  *	None.
730  *
731  *	Build ATA taskfile @tf for read/write request described by
732  *	@block, @n_block, @tf_flags and @tag on @dev.
733  *
734  *	RETURNS:
735  *
736  *	0 on success, -ERANGE if the request is too large for @dev,
737  *	-EINVAL if the request is invalid.
738  */
ata_build_rw_tf(struct ata_taskfile * tf,struct ata_device * dev,u64 block,u32 n_block,unsigned int tf_flags,unsigned int tag,int class)739 int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
740 		    u64 block, u32 n_block, unsigned int tf_flags,
741 		    unsigned int tag, int class)
742 {
743 	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
744 	tf->flags |= tf_flags;
745 
746 	if (ata_ncq_enabled(dev) && !ata_tag_internal(tag)) {
747 		/* yay, NCQ */
748 		if (!lba_48_ok(block, n_block))
749 			return -ERANGE;
750 
751 		tf->protocol = ATA_PROT_NCQ;
752 		tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
753 
754 		if (tf->flags & ATA_TFLAG_WRITE)
755 			tf->command = ATA_CMD_FPDMA_WRITE;
756 		else
757 			tf->command = ATA_CMD_FPDMA_READ;
758 
759 		tf->nsect = tag << 3;
760 		tf->hob_feature = (n_block >> 8) & 0xff;
761 		tf->feature = n_block & 0xff;
762 
763 		tf->hob_lbah = (block >> 40) & 0xff;
764 		tf->hob_lbam = (block >> 32) & 0xff;
765 		tf->hob_lbal = (block >> 24) & 0xff;
766 		tf->lbah = (block >> 16) & 0xff;
767 		tf->lbam = (block >> 8) & 0xff;
768 		tf->lbal = block & 0xff;
769 
770 		tf->device = ATA_LBA;
771 		if (tf->flags & ATA_TFLAG_FUA)
772 			tf->device |= 1 << 7;
773 
774 		if (dev->flags & ATA_DFLAG_NCQ_PRIO) {
775 			if (class == IOPRIO_CLASS_RT)
776 				tf->hob_nsect |= ATA_PRIO_HIGH <<
777 						 ATA_SHIFT_PRIO;
778 		}
779 	} else if (dev->flags & ATA_DFLAG_LBA) {
780 		tf->flags |= ATA_TFLAG_LBA;
781 
782 		if (lba_28_ok(block, n_block)) {
783 			/* use LBA28 */
784 			tf->device |= (block >> 24) & 0xf;
785 		} else if (lba_48_ok(block, n_block)) {
786 			if (!(dev->flags & ATA_DFLAG_LBA48))
787 				return -ERANGE;
788 
789 			/* use LBA48 */
790 			tf->flags |= ATA_TFLAG_LBA48;
791 
792 			tf->hob_nsect = (n_block >> 8) & 0xff;
793 
794 			tf->hob_lbah = (block >> 40) & 0xff;
795 			tf->hob_lbam = (block >> 32) & 0xff;
796 			tf->hob_lbal = (block >> 24) & 0xff;
797 		} else
798 			/* request too large even for LBA48 */
799 			return -ERANGE;
800 
801 		if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
802 			return -EINVAL;
803 
804 		tf->nsect = n_block & 0xff;
805 
806 		tf->lbah = (block >> 16) & 0xff;
807 		tf->lbam = (block >> 8) & 0xff;
808 		tf->lbal = block & 0xff;
809 
810 		tf->device |= ATA_LBA;
811 	} else {
812 		/* CHS */
813 		u32 sect, head, cyl, track;
814 
815 		/* The request -may- be too large for CHS addressing. */
816 		if (!lba_28_ok(block, n_block))
817 			return -ERANGE;
818 
819 		if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
820 			return -EINVAL;
821 
822 		/* Convert LBA to CHS */
823 		track = (u32)block / dev->sectors;
824 		cyl   = track / dev->heads;
825 		head  = track % dev->heads;
826 		sect  = (u32)block % dev->sectors + 1;
827 
828 		DPRINTK("block %u track %u cyl %u head %u sect %u\n",
829 			(u32)block, track, cyl, head, sect);
830 
831 		/* Check whether the converted CHS can fit.
832 		   Cylinder: 0-65535
833 		   Head: 0-15
834 		   Sector: 1-255*/
835 		if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
836 			return -ERANGE;
837 
838 		tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
839 		tf->lbal = sect;
840 		tf->lbam = cyl;
841 		tf->lbah = cyl >> 8;
842 		tf->device |= head;
843 	}
844 
845 	return 0;
846 }
847 
848 /**
849  *	ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
850  *	@pio_mask: pio_mask
851  *	@mwdma_mask: mwdma_mask
852  *	@udma_mask: udma_mask
853  *
854  *	Pack @pio_mask, @mwdma_mask and @udma_mask into a single
855  *	unsigned int xfer_mask.
856  *
857  *	LOCKING:
858  *	None.
859  *
860  *	RETURNS:
861  *	Packed xfer_mask.
862  */
ata_pack_xfermask(unsigned long pio_mask,unsigned long mwdma_mask,unsigned long udma_mask)863 unsigned long ata_pack_xfermask(unsigned long pio_mask,
864 				unsigned long mwdma_mask,
865 				unsigned long udma_mask)
866 {
867 	return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
868 		((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
869 		((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
870 }
871 
872 /**
873  *	ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
874  *	@xfer_mask: xfer_mask to unpack
875  *	@pio_mask: resulting pio_mask
876  *	@mwdma_mask: resulting mwdma_mask
877  *	@udma_mask: resulting udma_mask
878  *
879  *	Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
880  *	Any NULL destination masks will be ignored.
881  */
ata_unpack_xfermask(unsigned long xfer_mask,unsigned long * pio_mask,unsigned long * mwdma_mask,unsigned long * udma_mask)882 void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
883 			 unsigned long *mwdma_mask, unsigned long *udma_mask)
884 {
885 	if (pio_mask)
886 		*pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
887 	if (mwdma_mask)
888 		*mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
889 	if (udma_mask)
890 		*udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
891 }
892 
893 static const struct ata_xfer_ent {
894 	int shift, bits;
895 	u8 base;
896 } ata_xfer_tbl[] = {
897 	{ ATA_SHIFT_PIO, ATA_NR_PIO_MODES, XFER_PIO_0 },
898 	{ ATA_SHIFT_MWDMA, ATA_NR_MWDMA_MODES, XFER_MW_DMA_0 },
899 	{ ATA_SHIFT_UDMA, ATA_NR_UDMA_MODES, XFER_UDMA_0 },
900 	{ -1, },
901 };
902 
903 /**
904  *	ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
905  *	@xfer_mask: xfer_mask of interest
906  *
907  *	Return matching XFER_* value for @xfer_mask.  Only the highest
908  *	bit of @xfer_mask is considered.
909  *
910  *	LOCKING:
911  *	None.
912  *
913  *	RETURNS:
914  *	Matching XFER_* value, 0xff if no match found.
915  */
ata_xfer_mask2mode(unsigned long xfer_mask)916 u8 ata_xfer_mask2mode(unsigned long xfer_mask)
917 {
918 	int highbit = fls(xfer_mask) - 1;
919 	const struct ata_xfer_ent *ent;
920 
921 	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
922 		if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
923 			return ent->base + highbit - ent->shift;
924 	return 0xff;
925 }
926 
927 /**
928  *	ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
929  *	@xfer_mode: XFER_* of interest
930  *
931  *	Return matching xfer_mask for @xfer_mode.
932  *
933  *	LOCKING:
934  *	None.
935  *
936  *	RETURNS:
937  *	Matching xfer_mask, 0 if no match found.
938  */
ata_xfer_mode2mask(u8 xfer_mode)939 unsigned long ata_xfer_mode2mask(u8 xfer_mode)
940 {
941 	const struct ata_xfer_ent *ent;
942 
943 	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
944 		if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
945 			return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
946 				& ~((1 << ent->shift) - 1);
947 	return 0;
948 }
949 
950 /**
951  *	ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
952  *	@xfer_mode: XFER_* of interest
953  *
954  *	Return matching xfer_shift for @xfer_mode.
955  *
956  *	LOCKING:
957  *	None.
958  *
959  *	RETURNS:
960  *	Matching xfer_shift, -1 if no match found.
961  */
ata_xfer_mode2shift(unsigned long xfer_mode)962 int ata_xfer_mode2shift(unsigned long xfer_mode)
963 {
964 	const struct ata_xfer_ent *ent;
965 
966 	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
967 		if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
968 			return ent->shift;
969 	return -1;
970 }
971 
972 /**
973  *	ata_mode_string - convert xfer_mask to string
974  *	@xfer_mask: mask of bits supported; only highest bit counts.
975  *
976  *	Determine string which represents the highest speed
977  *	(highest bit in @modemask).
978  *
979  *	LOCKING:
980  *	None.
981  *
982  *	RETURNS:
983  *	Constant C string representing highest speed listed in
984  *	@mode_mask, or the constant C string "<n/a>".
985  */
ata_mode_string(unsigned long xfer_mask)986 const char *ata_mode_string(unsigned long xfer_mask)
987 {
988 	static const char * const xfer_mode_str[] = {
989 		"PIO0",
990 		"PIO1",
991 		"PIO2",
992 		"PIO3",
993 		"PIO4",
994 		"PIO5",
995 		"PIO6",
996 		"MWDMA0",
997 		"MWDMA1",
998 		"MWDMA2",
999 		"MWDMA3",
1000 		"MWDMA4",
1001 		"UDMA/16",
1002 		"UDMA/25",
1003 		"UDMA/33",
1004 		"UDMA/44",
1005 		"UDMA/66",
1006 		"UDMA/100",
1007 		"UDMA/133",
1008 		"UDMA7",
1009 	};
1010 	int highbit;
1011 
1012 	highbit = fls(xfer_mask) - 1;
1013 	if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
1014 		return xfer_mode_str[highbit];
1015 	return "<n/a>";
1016 }
1017 
sata_spd_string(unsigned int spd)1018 const char *sata_spd_string(unsigned int spd)
1019 {
1020 	static const char * const spd_str[] = {
1021 		"1.5 Gbps",
1022 		"3.0 Gbps",
1023 		"6.0 Gbps",
1024 	};
1025 
1026 	if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
1027 		return "<unknown>";
1028 	return spd_str[spd - 1];
1029 }
1030 
1031 /**
1032  *	ata_dev_classify - determine device type based on ATA-spec signature
1033  *	@tf: ATA taskfile register set for device to be identified
1034  *
1035  *	Determine from taskfile register contents whether a device is
1036  *	ATA or ATAPI, as per "Signature and persistence" section
1037  *	of ATA/PI spec (volume 1, sect 5.14).
1038  *
1039  *	LOCKING:
1040  *	None.
1041  *
1042  *	RETURNS:
1043  *	Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP,
1044  *	%ATA_DEV_ZAC, or %ATA_DEV_UNKNOWN the event of failure.
1045  */
ata_dev_classify(const struct ata_taskfile * tf)1046 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
1047 {
1048 	/* Apple's open source Darwin code hints that some devices only
1049 	 * put a proper signature into the LBA mid/high registers,
1050 	 * So, we only check those.  It's sufficient for uniqueness.
1051 	 *
1052 	 * ATA/ATAPI-7 (d1532v1r1: Feb. 19, 2003) specified separate
1053 	 * signatures for ATA and ATAPI devices attached on SerialATA,
1054 	 * 0x3c/0xc3 and 0x69/0x96 respectively.  However, SerialATA
1055 	 * spec has never mentioned about using different signatures
1056 	 * for ATA/ATAPI devices.  Then, Serial ATA II: Port
1057 	 * Multiplier specification began to use 0x69/0x96 to identify
1058 	 * port multpliers and 0x3c/0xc3 to identify SEMB device.
1059 	 * ATA/ATAPI-7 dropped descriptions about 0x3c/0xc3 and
1060 	 * 0x69/0x96 shortly and described them as reserved for
1061 	 * SerialATA.
1062 	 *
1063 	 * We follow the current spec and consider that 0x69/0x96
1064 	 * identifies a port multiplier and 0x3c/0xc3 a SEMB device.
1065 	 * Unfortunately, WDC WD1600JS-62MHB5 (a hard drive) reports
1066 	 * SEMB signature.  This is worked around in
1067 	 * ata_dev_read_id().
1068 	 */
1069 	if ((tf->lbam == 0) && (tf->lbah == 0)) {
1070 		DPRINTK("found ATA device by sig\n");
1071 		return ATA_DEV_ATA;
1072 	}
1073 
1074 	if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
1075 		DPRINTK("found ATAPI device by sig\n");
1076 		return ATA_DEV_ATAPI;
1077 	}
1078 
1079 	if ((tf->lbam == 0x69) && (tf->lbah == 0x96)) {
1080 		DPRINTK("found PMP device by sig\n");
1081 		return ATA_DEV_PMP;
1082 	}
1083 
1084 	if ((tf->lbam == 0x3c) && (tf->lbah == 0xc3)) {
1085 		DPRINTK("found SEMB device by sig (could be ATA device)\n");
1086 		return ATA_DEV_SEMB;
1087 	}
1088 
1089 	if ((tf->lbam == 0xcd) && (tf->lbah == 0xab)) {
1090 		DPRINTK("found ZAC device by sig\n");
1091 		return ATA_DEV_ZAC;
1092 	}
1093 
1094 	DPRINTK("unknown device\n");
1095 	return ATA_DEV_UNKNOWN;
1096 }
1097 
1098 /**
1099  *	ata_id_string - Convert IDENTIFY DEVICE page into string
1100  *	@id: IDENTIFY DEVICE results we will examine
1101  *	@s: string into which data is output
1102  *	@ofs: offset into identify device page
1103  *	@len: length of string to return. must be an even number.
1104  *
1105  *	The strings in the IDENTIFY DEVICE page are broken up into
1106  *	16-bit chunks.  Run through the string, and output each
1107  *	8-bit chunk linearly, regardless of platform.
1108  *
1109  *	LOCKING:
1110  *	caller.
1111  */
1112 
ata_id_string(const u16 * id,unsigned char * s,unsigned int ofs,unsigned int len)1113 void ata_id_string(const u16 *id, unsigned char *s,
1114 		   unsigned int ofs, unsigned int len)
1115 {
1116 	unsigned int c;
1117 
1118 	BUG_ON(len & 1);
1119 
1120 	while (len > 0) {
1121 		c = id[ofs] >> 8;
1122 		*s = c;
1123 		s++;
1124 
1125 		c = id[ofs] & 0xff;
1126 		*s = c;
1127 		s++;
1128 
1129 		ofs++;
1130 		len -= 2;
1131 	}
1132 }
1133 
1134 /**
1135  *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1136  *	@id: IDENTIFY DEVICE results we will examine
1137  *	@s: string into which data is output
1138  *	@ofs: offset into identify device page
1139  *	@len: length of string to return. must be an odd number.
1140  *
1141  *	This function is identical to ata_id_string except that it
1142  *	trims trailing spaces and terminates the resulting string with
1143  *	null.  @len must be actual maximum length (even number) + 1.
1144  *
1145  *	LOCKING:
1146  *	caller.
1147  */
ata_id_c_string(const u16 * id,unsigned char * s,unsigned int ofs,unsigned int len)1148 void ata_id_c_string(const u16 *id, unsigned char *s,
1149 		     unsigned int ofs, unsigned int len)
1150 {
1151 	unsigned char *p;
1152 
1153 	ata_id_string(id, s, ofs, len - 1);
1154 
1155 	p = s + strnlen(s, len - 1);
1156 	while (p > s && p[-1] == ' ')
1157 		p--;
1158 	*p = '\0';
1159 }
1160 
ata_id_n_sectors(const u16 * id)1161 static u64 ata_id_n_sectors(const u16 *id)
1162 {
1163 	if (ata_id_has_lba(id)) {
1164 		if (ata_id_has_lba48(id))
1165 			return ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
1166 		else
1167 			return ata_id_u32(id, ATA_ID_LBA_CAPACITY);
1168 	} else {
1169 		if (ata_id_current_chs_valid(id))
1170 			return id[ATA_ID_CUR_CYLS] * id[ATA_ID_CUR_HEADS] *
1171 			       id[ATA_ID_CUR_SECTORS];
1172 		else
1173 			return id[ATA_ID_CYLS] * id[ATA_ID_HEADS] *
1174 			       id[ATA_ID_SECTORS];
1175 	}
1176 }
1177 
ata_tf_to_lba48(const struct ata_taskfile * tf)1178 u64 ata_tf_to_lba48(const struct ata_taskfile *tf)
1179 {
1180 	u64 sectors = 0;
1181 
1182 	sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
1183 	sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
1184 	sectors |= ((u64)(tf->hob_lbal & 0xff)) << 24;
1185 	sectors |= (tf->lbah & 0xff) << 16;
1186 	sectors |= (tf->lbam & 0xff) << 8;
1187 	sectors |= (tf->lbal & 0xff);
1188 
1189 	return sectors;
1190 }
1191 
ata_tf_to_lba(const struct ata_taskfile * tf)1192 u64 ata_tf_to_lba(const struct ata_taskfile *tf)
1193 {
1194 	u64 sectors = 0;
1195 
1196 	sectors |= (tf->device & 0x0f) << 24;
1197 	sectors |= (tf->lbah & 0xff) << 16;
1198 	sectors |= (tf->lbam & 0xff) << 8;
1199 	sectors |= (tf->lbal & 0xff);
1200 
1201 	return sectors;
1202 }
1203 
1204 /**
1205  *	ata_read_native_max_address - Read native max address
1206  *	@dev: target device
1207  *	@max_sectors: out parameter for the result native max address
1208  *
1209  *	Perform an LBA48 or LBA28 native size query upon the device in
1210  *	question.
1211  *
1212  *	RETURNS:
1213  *	0 on success, -EACCES if command is aborted by the drive.
1214  *	-EIO on other errors.
1215  */
ata_read_native_max_address(struct ata_device * dev,u64 * max_sectors)1216 static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
1217 {
1218 	unsigned int err_mask;
1219 	struct ata_taskfile tf;
1220 	int lba48 = ata_id_has_lba48(dev->id);
1221 
1222 	ata_tf_init(dev, &tf);
1223 
1224 	/* always clear all address registers */
1225 	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1226 
1227 	if (lba48) {
1228 		tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
1229 		tf.flags |= ATA_TFLAG_LBA48;
1230 	} else
1231 		tf.command = ATA_CMD_READ_NATIVE_MAX;
1232 
1233 	tf.protocol = ATA_PROT_NODATA;
1234 	tf.device |= ATA_LBA;
1235 
1236 	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1237 	if (err_mask) {
1238 		ata_dev_warn(dev,
1239 			     "failed to read native max address (err_mask=0x%x)\n",
1240 			     err_mask);
1241 		if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
1242 			return -EACCES;
1243 		return -EIO;
1244 	}
1245 
1246 	if (lba48)
1247 		*max_sectors = ata_tf_to_lba48(&tf) + 1;
1248 	else
1249 		*max_sectors = ata_tf_to_lba(&tf) + 1;
1250 	if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1251 		(*max_sectors)--;
1252 	return 0;
1253 }
1254 
1255 /**
1256  *	ata_set_max_sectors - Set max sectors
1257  *	@dev: target device
1258  *	@new_sectors: new max sectors value to set for the device
1259  *
1260  *	Set max sectors of @dev to @new_sectors.
1261  *
1262  *	RETURNS:
1263  *	0 on success, -EACCES if command is aborted or denied (due to
1264  *	previous non-volatile SET_MAX) by the drive.  -EIO on other
1265  *	errors.
1266  */
ata_set_max_sectors(struct ata_device * dev,u64 new_sectors)1267 static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
1268 {
1269 	unsigned int err_mask;
1270 	struct ata_taskfile tf;
1271 	int lba48 = ata_id_has_lba48(dev->id);
1272 
1273 	new_sectors--;
1274 
1275 	ata_tf_init(dev, &tf);
1276 
1277 	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1278 
1279 	if (lba48) {
1280 		tf.command = ATA_CMD_SET_MAX_EXT;
1281 		tf.flags |= ATA_TFLAG_LBA48;
1282 
1283 		tf.hob_lbal = (new_sectors >> 24) & 0xff;
1284 		tf.hob_lbam = (new_sectors >> 32) & 0xff;
1285 		tf.hob_lbah = (new_sectors >> 40) & 0xff;
1286 	} else {
1287 		tf.command = ATA_CMD_SET_MAX;
1288 
1289 		tf.device |= (new_sectors >> 24) & 0xf;
1290 	}
1291 
1292 	tf.protocol = ATA_PROT_NODATA;
1293 	tf.device |= ATA_LBA;
1294 
1295 	tf.lbal = (new_sectors >> 0) & 0xff;
1296 	tf.lbam = (new_sectors >> 8) & 0xff;
1297 	tf.lbah = (new_sectors >> 16) & 0xff;
1298 
1299 	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1300 	if (err_mask) {
1301 		ata_dev_warn(dev,
1302 			     "failed to set max address (err_mask=0x%x)\n",
1303 			     err_mask);
1304 		if (err_mask == AC_ERR_DEV &&
1305 		    (tf.feature & (ATA_ABORTED | ATA_IDNF)))
1306 			return -EACCES;
1307 		return -EIO;
1308 	}
1309 
1310 	return 0;
1311 }
1312 
1313 /**
1314  *	ata_hpa_resize		-	Resize a device with an HPA set
1315  *	@dev: Device to resize
1316  *
1317  *	Read the size of an LBA28 or LBA48 disk with HPA features and resize
1318  *	it if required to the full size of the media. The caller must check
1319  *	the drive has the HPA feature set enabled.
1320  *
1321  *	RETURNS:
1322  *	0 on success, -errno on failure.
1323  */
ata_hpa_resize(struct ata_device * dev)1324 static int ata_hpa_resize(struct ata_device *dev)
1325 {
1326 	struct ata_eh_context *ehc = &dev->link->eh_context;
1327 	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
1328 	bool unlock_hpa = ata_ignore_hpa || dev->flags & ATA_DFLAG_UNLOCK_HPA;
1329 	u64 sectors = ata_id_n_sectors(dev->id);
1330 	u64 native_sectors;
1331 	int rc;
1332 
1333 	/* do we need to do it? */
1334 	if ((dev->class != ATA_DEV_ATA && dev->class != ATA_DEV_ZAC) ||
1335 	    !ata_id_has_lba(dev->id) || !ata_id_hpa_enabled(dev->id) ||
1336 	    (dev->horkage & ATA_HORKAGE_BROKEN_HPA))
1337 		return 0;
1338 
1339 	/* read native max address */
1340 	rc = ata_read_native_max_address(dev, &native_sectors);
1341 	if (rc) {
1342 		/* If device aborted the command or HPA isn't going to
1343 		 * be unlocked, skip HPA resizing.
1344 		 */
1345 		if (rc == -EACCES || !unlock_hpa) {
1346 			ata_dev_warn(dev,
1347 				     "HPA support seems broken, skipping HPA handling\n");
1348 			dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1349 
1350 			/* we can continue if device aborted the command */
1351 			if (rc == -EACCES)
1352 				rc = 0;
1353 		}
1354 
1355 		return rc;
1356 	}
1357 	dev->n_native_sectors = native_sectors;
1358 
1359 	/* nothing to do? */
1360 	if (native_sectors <= sectors || !unlock_hpa) {
1361 		if (!print_info || native_sectors == sectors)
1362 			return 0;
1363 
1364 		if (native_sectors > sectors)
1365 			ata_dev_info(dev,
1366 				"HPA detected: current %llu, native %llu\n",
1367 				(unsigned long long)sectors,
1368 				(unsigned long long)native_sectors);
1369 		else if (native_sectors < sectors)
1370 			ata_dev_warn(dev,
1371 				"native sectors (%llu) is smaller than sectors (%llu)\n",
1372 				(unsigned long long)native_sectors,
1373 				(unsigned long long)sectors);
1374 		return 0;
1375 	}
1376 
1377 	/* let's unlock HPA */
1378 	rc = ata_set_max_sectors(dev, native_sectors);
1379 	if (rc == -EACCES) {
1380 		/* if device aborted the command, skip HPA resizing */
1381 		ata_dev_warn(dev,
1382 			     "device aborted resize (%llu -> %llu), skipping HPA handling\n",
1383 			     (unsigned long long)sectors,
1384 			     (unsigned long long)native_sectors);
1385 		dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1386 		return 0;
1387 	} else if (rc)
1388 		return rc;
1389 
1390 	/* re-read IDENTIFY data */
1391 	rc = ata_dev_reread_id(dev, 0);
1392 	if (rc) {
1393 		ata_dev_err(dev,
1394 			    "failed to re-read IDENTIFY data after HPA resizing\n");
1395 		return rc;
1396 	}
1397 
1398 	if (print_info) {
1399 		u64 new_sectors = ata_id_n_sectors(dev->id);
1400 		ata_dev_info(dev,
1401 			"HPA unlocked: %llu -> %llu, native %llu\n",
1402 			(unsigned long long)sectors,
1403 			(unsigned long long)new_sectors,
1404 			(unsigned long long)native_sectors);
1405 	}
1406 
1407 	return 0;
1408 }
1409 
1410 /**
1411  *	ata_dump_id - IDENTIFY DEVICE info debugging output
1412  *	@id: IDENTIFY DEVICE page to dump
1413  *
1414  *	Dump selected 16-bit words from the given IDENTIFY DEVICE
1415  *	page.
1416  *
1417  *	LOCKING:
1418  *	caller.
1419  */
1420 
ata_dump_id(const u16 * id)1421 static inline void ata_dump_id(const u16 *id)
1422 {
1423 	DPRINTK("49==0x%04x  "
1424 		"53==0x%04x  "
1425 		"63==0x%04x  "
1426 		"64==0x%04x  "
1427 		"75==0x%04x  \n",
1428 		id[49],
1429 		id[53],
1430 		id[63],
1431 		id[64],
1432 		id[75]);
1433 	DPRINTK("80==0x%04x  "
1434 		"81==0x%04x  "
1435 		"82==0x%04x  "
1436 		"83==0x%04x  "
1437 		"84==0x%04x  \n",
1438 		id[80],
1439 		id[81],
1440 		id[82],
1441 		id[83],
1442 		id[84]);
1443 	DPRINTK("88==0x%04x  "
1444 		"93==0x%04x\n",
1445 		id[88],
1446 		id[93]);
1447 }
1448 
1449 /**
1450  *	ata_id_xfermask - Compute xfermask from the given IDENTIFY data
1451  *	@id: IDENTIFY data to compute xfer mask from
1452  *
1453  *	Compute the xfermask for this device. This is not as trivial
1454  *	as it seems if we must consider early devices correctly.
1455  *
1456  *	FIXME: pre IDE drive timing (do we care ?).
1457  *
1458  *	LOCKING:
1459  *	None.
1460  *
1461  *	RETURNS:
1462  *	Computed xfermask
1463  */
ata_id_xfermask(const u16 * id)1464 unsigned long ata_id_xfermask(const u16 *id)
1465 {
1466 	unsigned long pio_mask, mwdma_mask, udma_mask;
1467 
1468 	/* Usual case. Word 53 indicates word 64 is valid */
1469 	if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
1470 		pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
1471 		pio_mask <<= 3;
1472 		pio_mask |= 0x7;
1473 	} else {
1474 		/* If word 64 isn't valid then Word 51 high byte holds
1475 		 * the PIO timing number for the maximum. Turn it into
1476 		 * a mask.
1477 		 */
1478 		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1479 		if (mode < 5)	/* Valid PIO range */
1480 			pio_mask = (2 << mode) - 1;
1481 		else
1482 			pio_mask = 1;
1483 
1484 		/* But wait.. there's more. Design your standards by
1485 		 * committee and you too can get a free iordy field to
1486 		 * process. However its the speeds not the modes that
1487 		 * are supported... Note drivers using the timing API
1488 		 * will get this right anyway
1489 		 */
1490 	}
1491 
1492 	mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1493 
1494 	if (ata_id_is_cfa(id)) {
1495 		/*
1496 		 *	Process compact flash extended modes
1497 		 */
1498 		int pio = (id[ATA_ID_CFA_MODES] >> 0) & 0x7;
1499 		int dma = (id[ATA_ID_CFA_MODES] >> 3) & 0x7;
1500 
1501 		if (pio)
1502 			pio_mask |= (1 << 5);
1503 		if (pio > 1)
1504 			pio_mask |= (1 << 6);
1505 		if (dma)
1506 			mwdma_mask |= (1 << 3);
1507 		if (dma > 1)
1508 			mwdma_mask |= (1 << 4);
1509 	}
1510 
1511 	udma_mask = 0;
1512 	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
1513 		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1514 
1515 	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
1516 }
1517 
ata_qc_complete_internal(struct ata_queued_cmd * qc)1518 static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1519 {
1520 	struct completion *waiting = qc->private_data;
1521 
1522 	complete(waiting);
1523 }
1524 
1525 /**
1526  *	ata_exec_internal_sg - execute libata internal command
1527  *	@dev: Device to which the command is sent
1528  *	@tf: Taskfile registers for the command and the result
1529  *	@cdb: CDB for packet command
1530  *	@dma_dir: Data transfer direction of the command
1531  *	@sgl: sg list for the data buffer of the command
1532  *	@n_elem: Number of sg entries
1533  *	@timeout: Timeout in msecs (0 for default)
1534  *
1535  *	Executes libata internal command with timeout.  @tf contains
1536  *	command on entry and result on return.  Timeout and error
1537  *	conditions are reported via return value.  No recovery action
1538  *	is taken after a command times out.  It's caller's duty to
1539  *	clean up after timeout.
1540  *
1541  *	LOCKING:
1542  *	None.  Should be called with kernel context, might sleep.
1543  *
1544  *	RETURNS:
1545  *	Zero on success, AC_ERR_* mask on failure
1546  */
ata_exec_internal_sg(struct ata_device * dev,struct ata_taskfile * tf,const u8 * cdb,int dma_dir,struct scatterlist * sgl,unsigned int n_elem,unsigned long timeout)1547 unsigned ata_exec_internal_sg(struct ata_device *dev,
1548 			      struct ata_taskfile *tf, const u8 *cdb,
1549 			      int dma_dir, struct scatterlist *sgl,
1550 			      unsigned int n_elem, unsigned long timeout)
1551 {
1552 	struct ata_link *link = dev->link;
1553 	struct ata_port *ap = link->ap;
1554 	u8 command = tf->command;
1555 	int auto_timeout = 0;
1556 	struct ata_queued_cmd *qc;
1557 	unsigned int preempted_tag;
1558 	u32 preempted_sactive;
1559 	u64 preempted_qc_active;
1560 	int preempted_nr_active_links;
1561 	DECLARE_COMPLETION_ONSTACK(wait);
1562 	unsigned long flags;
1563 	unsigned int err_mask;
1564 	int rc;
1565 
1566 	spin_lock_irqsave(ap->lock, flags);
1567 
1568 	/* no internal command while frozen */
1569 	if (ap->pflags & ATA_PFLAG_FROZEN) {
1570 		spin_unlock_irqrestore(ap->lock, flags);
1571 		return AC_ERR_SYSTEM;
1572 	}
1573 
1574 	/* initialize internal qc */
1575 	qc = __ata_qc_from_tag(ap, ATA_TAG_INTERNAL);
1576 
1577 	qc->tag = ATA_TAG_INTERNAL;
1578 	qc->hw_tag = 0;
1579 	qc->scsicmd = NULL;
1580 	qc->ap = ap;
1581 	qc->dev = dev;
1582 	ata_qc_reinit(qc);
1583 
1584 	preempted_tag = link->active_tag;
1585 	preempted_sactive = link->sactive;
1586 	preempted_qc_active = ap->qc_active;
1587 	preempted_nr_active_links = ap->nr_active_links;
1588 	link->active_tag = ATA_TAG_POISON;
1589 	link->sactive = 0;
1590 	ap->qc_active = 0;
1591 	ap->nr_active_links = 0;
1592 
1593 	/* prepare & issue qc */
1594 	qc->tf = *tf;
1595 	if (cdb)
1596 		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1597 
1598 	/* some SATA bridges need us to indicate data xfer direction */
1599 	if (tf->protocol == ATAPI_PROT_DMA && (dev->flags & ATA_DFLAG_DMADIR) &&
1600 	    dma_dir == DMA_FROM_DEVICE)
1601 		qc->tf.feature |= ATAPI_DMADIR;
1602 
1603 	qc->flags |= ATA_QCFLAG_RESULT_TF;
1604 	qc->dma_dir = dma_dir;
1605 	if (dma_dir != DMA_NONE) {
1606 		unsigned int i, buflen = 0;
1607 		struct scatterlist *sg;
1608 
1609 		for_each_sg(sgl, sg, n_elem, i)
1610 			buflen += sg->length;
1611 
1612 		ata_sg_init(qc, sgl, n_elem);
1613 		qc->nbytes = buflen;
1614 	}
1615 
1616 	qc->private_data = &wait;
1617 	qc->complete_fn = ata_qc_complete_internal;
1618 
1619 	ata_qc_issue(qc);
1620 
1621 	spin_unlock_irqrestore(ap->lock, flags);
1622 
1623 	if (!timeout) {
1624 		if (ata_probe_timeout)
1625 			timeout = ata_probe_timeout * 1000;
1626 		else {
1627 			timeout = ata_internal_cmd_timeout(dev, command);
1628 			auto_timeout = 1;
1629 		}
1630 	}
1631 
1632 	if (ap->ops->error_handler)
1633 		ata_eh_release(ap);
1634 
1635 	rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1636 
1637 	if (ap->ops->error_handler)
1638 		ata_eh_acquire(ap);
1639 
1640 	ata_sff_flush_pio_task(ap);
1641 
1642 	if (!rc) {
1643 		spin_lock_irqsave(ap->lock, flags);
1644 
1645 		/* We're racing with irq here.  If we lose, the
1646 		 * following test prevents us from completing the qc
1647 		 * twice.  If we win, the port is frozen and will be
1648 		 * cleaned up by ->post_internal_cmd().
1649 		 */
1650 		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1651 			qc->err_mask |= AC_ERR_TIMEOUT;
1652 
1653 			if (ap->ops->error_handler)
1654 				ata_port_freeze(ap);
1655 			else
1656 				ata_qc_complete(qc);
1657 
1658 			if (ata_msg_warn(ap))
1659 				ata_dev_warn(dev, "qc timeout (cmd 0x%x)\n",
1660 					     command);
1661 		}
1662 
1663 		spin_unlock_irqrestore(ap->lock, flags);
1664 	}
1665 
1666 	/* do post_internal_cmd */
1667 	if (ap->ops->post_internal_cmd)
1668 		ap->ops->post_internal_cmd(qc);
1669 
1670 	/* perform minimal error analysis */
1671 	if (qc->flags & ATA_QCFLAG_FAILED) {
1672 		if (qc->result_tf.command & (ATA_ERR | ATA_DF))
1673 			qc->err_mask |= AC_ERR_DEV;
1674 
1675 		if (!qc->err_mask)
1676 			qc->err_mask |= AC_ERR_OTHER;
1677 
1678 		if (qc->err_mask & ~AC_ERR_OTHER)
1679 			qc->err_mask &= ~AC_ERR_OTHER;
1680 	} else if (qc->tf.command == ATA_CMD_REQ_SENSE_DATA) {
1681 		qc->result_tf.command |= ATA_SENSE;
1682 	}
1683 
1684 	/* finish up */
1685 	spin_lock_irqsave(ap->lock, flags);
1686 
1687 	*tf = qc->result_tf;
1688 	err_mask = qc->err_mask;
1689 
1690 	ata_qc_free(qc);
1691 	link->active_tag = preempted_tag;
1692 	link->sactive = preempted_sactive;
1693 	ap->qc_active = preempted_qc_active;
1694 	ap->nr_active_links = preempted_nr_active_links;
1695 
1696 	spin_unlock_irqrestore(ap->lock, flags);
1697 
1698 	if ((err_mask & AC_ERR_TIMEOUT) && auto_timeout)
1699 		ata_internal_cmd_timed_out(dev, command);
1700 
1701 	return err_mask;
1702 }
1703 
1704 /**
1705  *	ata_exec_internal - execute libata internal command
1706  *	@dev: Device to which the command is sent
1707  *	@tf: Taskfile registers for the command and the result
1708  *	@cdb: CDB for packet command
1709  *	@dma_dir: Data transfer direction of the command
1710  *	@buf: Data buffer of the command
1711  *	@buflen: Length of data buffer
1712  *	@timeout: Timeout in msecs (0 for default)
1713  *
1714  *	Wrapper around ata_exec_internal_sg() which takes simple
1715  *	buffer instead of sg list.
1716  *
1717  *	LOCKING:
1718  *	None.  Should be called with kernel context, might sleep.
1719  *
1720  *	RETURNS:
1721  *	Zero on success, AC_ERR_* mask on failure
1722  */
ata_exec_internal(struct ata_device * dev,struct ata_taskfile * tf,const u8 * cdb,int dma_dir,void * buf,unsigned int buflen,unsigned long timeout)1723 unsigned ata_exec_internal(struct ata_device *dev,
1724 			   struct ata_taskfile *tf, const u8 *cdb,
1725 			   int dma_dir, void *buf, unsigned int buflen,
1726 			   unsigned long timeout)
1727 {
1728 	struct scatterlist *psg = NULL, sg;
1729 	unsigned int n_elem = 0;
1730 
1731 	if (dma_dir != DMA_NONE) {
1732 		WARN_ON(!buf);
1733 		sg_init_one(&sg, buf, buflen);
1734 		psg = &sg;
1735 		n_elem++;
1736 	}
1737 
1738 	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
1739 				    timeout);
1740 }
1741 
1742 /**
1743  *	ata_pio_need_iordy	-	check if iordy needed
1744  *	@adev: ATA device
1745  *
1746  *	Check if the current speed of the device requires IORDY. Used
1747  *	by various controllers for chip configuration.
1748  */
ata_pio_need_iordy(const struct ata_device * adev)1749 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1750 {
1751 	/* Don't set IORDY if we're preparing for reset.  IORDY may
1752 	 * lead to controller lock up on certain controllers if the
1753 	 * port is not occupied.  See bko#11703 for details.
1754 	 */
1755 	if (adev->link->ap->pflags & ATA_PFLAG_RESETTING)
1756 		return 0;
1757 	/* Controller doesn't support IORDY.  Probably a pointless
1758 	 * check as the caller should know this.
1759 	 */
1760 	if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1761 		return 0;
1762 	/* CF spec. r4.1 Table 22 says no iordy on PIO5 and PIO6.  */
1763 	if (ata_id_is_cfa(adev->id)
1764 	    && (adev->pio_mode == XFER_PIO_5 || adev->pio_mode == XFER_PIO_6))
1765 		return 0;
1766 	/* PIO3 and higher it is mandatory */
1767 	if (adev->pio_mode > XFER_PIO_2)
1768 		return 1;
1769 	/* We turn it on when possible */
1770 	if (ata_id_has_iordy(adev->id))
1771 		return 1;
1772 	return 0;
1773 }
1774 
1775 /**
1776  *	ata_pio_mask_no_iordy	-	Return the non IORDY mask
1777  *	@adev: ATA device
1778  *
1779  *	Compute the highest mode possible if we are not using iordy. Return
1780  *	-1 if no iordy mode is available.
1781  */
ata_pio_mask_no_iordy(const struct ata_device * adev)1782 static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
1783 {
1784 	/* If we have no drive specific rule, then PIO 2 is non IORDY */
1785 	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE */
1786 		u16 pio = adev->id[ATA_ID_EIDE_PIO];
1787 		/* Is the speed faster than the drive allows non IORDY ? */
1788 		if (pio) {
1789 			/* This is cycle times not frequency - watch the logic! */
1790 			if (pio > 240)	/* PIO2 is 240nS per cycle */
1791 				return 3 << ATA_SHIFT_PIO;
1792 			return 7 << ATA_SHIFT_PIO;
1793 		}
1794 	}
1795 	return 3 << ATA_SHIFT_PIO;
1796 }
1797 
1798 /**
1799  *	ata_do_dev_read_id		-	default ID read method
1800  *	@dev: device
1801  *	@tf: proposed taskfile
1802  *	@id: data buffer
1803  *
1804  *	Issue the identify taskfile and hand back the buffer containing
1805  *	identify data. For some RAID controllers and for pre ATA devices
1806  *	this function is wrapped or replaced by the driver
1807  */
ata_do_dev_read_id(struct ata_device * dev,struct ata_taskfile * tf,u16 * id)1808 unsigned int ata_do_dev_read_id(struct ata_device *dev,
1809 					struct ata_taskfile *tf, u16 *id)
1810 {
1811 	return ata_exec_internal(dev, tf, NULL, DMA_FROM_DEVICE,
1812 				     id, sizeof(id[0]) * ATA_ID_WORDS, 0);
1813 }
1814 
1815 /**
1816  *	ata_dev_read_id - Read ID data from the specified device
1817  *	@dev: target device
1818  *	@p_class: pointer to class of the target device (may be changed)
1819  *	@flags: ATA_READID_* flags
1820  *	@id: buffer to read IDENTIFY data into
1821  *
1822  *	Read ID data from the specified device.  ATA_CMD_ID_ATA is
1823  *	performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1824  *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
1825  *	for pre-ATA4 drives.
1826  *
1827  *	FIXME: ATA_CMD_ID_ATA is optional for early drives and right
1828  *	now we abort if we hit that case.
1829  *
1830  *	LOCKING:
1831  *	Kernel thread context (may sleep)
1832  *
1833  *	RETURNS:
1834  *	0 on success, -errno otherwise.
1835  */
ata_dev_read_id(struct ata_device * dev,unsigned int * p_class,unsigned int flags,u16 * id)1836 int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1837 		    unsigned int flags, u16 *id)
1838 {
1839 	struct ata_port *ap = dev->link->ap;
1840 	unsigned int class = *p_class;
1841 	struct ata_taskfile tf;
1842 	unsigned int err_mask = 0;
1843 	const char *reason;
1844 	bool is_semb = class == ATA_DEV_SEMB;
1845 	int may_fallback = 1, tried_spinup = 0;
1846 	int rc;
1847 
1848 	if (ata_msg_ctl(ap))
1849 		ata_dev_dbg(dev, "%s: ENTER\n", __func__);
1850 
1851 retry:
1852 	ata_tf_init(dev, &tf);
1853 
1854 	switch (class) {
1855 	case ATA_DEV_SEMB:
1856 		class = ATA_DEV_ATA;	/* some hard drives report SEMB sig */
1857 		/* fall through */
1858 	case ATA_DEV_ATA:
1859 	case ATA_DEV_ZAC:
1860 		tf.command = ATA_CMD_ID_ATA;
1861 		break;
1862 	case ATA_DEV_ATAPI:
1863 		tf.command = ATA_CMD_ID_ATAPI;
1864 		break;
1865 	default:
1866 		rc = -ENODEV;
1867 		reason = "unsupported class";
1868 		goto err_out;
1869 	}
1870 
1871 	tf.protocol = ATA_PROT_PIO;
1872 
1873 	/* Some devices choke if TF registers contain garbage.  Make
1874 	 * sure those are properly initialized.
1875 	 */
1876 	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1877 
1878 	/* Device presence detection is unreliable on some
1879 	 * controllers.  Always poll IDENTIFY if available.
1880 	 */
1881 	tf.flags |= ATA_TFLAG_POLLING;
1882 
1883 	if (ap->ops->read_id)
1884 		err_mask = ap->ops->read_id(dev, &tf, id);
1885 	else
1886 		err_mask = ata_do_dev_read_id(dev, &tf, id);
1887 
1888 	if (err_mask) {
1889 		if (err_mask & AC_ERR_NODEV_HINT) {
1890 			ata_dev_dbg(dev, "NODEV after polling detection\n");
1891 			return -ENOENT;
1892 		}
1893 
1894 		if (is_semb) {
1895 			ata_dev_info(dev,
1896 		     "IDENTIFY failed on device w/ SEMB sig, disabled\n");
1897 			/* SEMB is not supported yet */
1898 			*p_class = ATA_DEV_SEMB_UNSUP;
1899 			return 0;
1900 		}
1901 
1902 		if ((err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
1903 			/* Device or controller might have reported
1904 			 * the wrong device class.  Give a shot at the
1905 			 * other IDENTIFY if the current one is
1906 			 * aborted by the device.
1907 			 */
1908 			if (may_fallback) {
1909 				may_fallback = 0;
1910 
1911 				if (class == ATA_DEV_ATA)
1912 					class = ATA_DEV_ATAPI;
1913 				else
1914 					class = ATA_DEV_ATA;
1915 				goto retry;
1916 			}
1917 
1918 			/* Control reaches here iff the device aborted
1919 			 * both flavors of IDENTIFYs which happens
1920 			 * sometimes with phantom devices.
1921 			 */
1922 			ata_dev_dbg(dev,
1923 				    "both IDENTIFYs aborted, assuming NODEV\n");
1924 			return -ENOENT;
1925 		}
1926 
1927 		rc = -EIO;
1928 		reason = "I/O error";
1929 		goto err_out;
1930 	}
1931 
1932 	if (dev->horkage & ATA_HORKAGE_DUMP_ID) {
1933 		ata_dev_dbg(dev, "dumping IDENTIFY data, "
1934 			    "class=%d may_fallback=%d tried_spinup=%d\n",
1935 			    class, may_fallback, tried_spinup);
1936 		print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET,
1937 			       16, 2, id, ATA_ID_WORDS * sizeof(*id), true);
1938 	}
1939 
1940 	/* Falling back doesn't make sense if ID data was read
1941 	 * successfully at least once.
1942 	 */
1943 	may_fallback = 0;
1944 
1945 	swap_buf_le16(id, ATA_ID_WORDS);
1946 
1947 	/* sanity check */
1948 	rc = -EINVAL;
1949 	reason = "device reports invalid type";
1950 
1951 	if (class == ATA_DEV_ATA || class == ATA_DEV_ZAC) {
1952 		if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
1953 			goto err_out;
1954 		if (ap->host->flags & ATA_HOST_IGNORE_ATA &&
1955 							ata_id_is_ata(id)) {
1956 			ata_dev_dbg(dev,
1957 				"host indicates ignore ATA devices, ignored\n");
1958 			return -ENOENT;
1959 		}
1960 	} else {
1961 		if (ata_id_is_ata(id))
1962 			goto err_out;
1963 	}
1964 
1965 	if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) {
1966 		tried_spinup = 1;
1967 		/*
1968 		 * Drive powered-up in standby mode, and requires a specific
1969 		 * SET_FEATURES spin-up subcommand before it will accept
1970 		 * anything other than the original IDENTIFY command.
1971 		 */
1972 		err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
1973 		if (err_mask && id[2] != 0x738c) {
1974 			rc = -EIO;
1975 			reason = "SPINUP failed";
1976 			goto err_out;
1977 		}
1978 		/*
1979 		 * If the drive initially returned incomplete IDENTIFY info,
1980 		 * we now must reissue the IDENTIFY command.
1981 		 */
1982 		if (id[2] == 0x37c8)
1983 			goto retry;
1984 	}
1985 
1986 	if ((flags & ATA_READID_POSTRESET) &&
1987 	    (class == ATA_DEV_ATA || class == ATA_DEV_ZAC)) {
1988 		/*
1989 		 * The exact sequence expected by certain pre-ATA4 drives is:
1990 		 * SRST RESET
1991 		 * IDENTIFY (optional in early ATA)
1992 		 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
1993 		 * anything else..
1994 		 * Some drives were very specific about that exact sequence.
1995 		 *
1996 		 * Note that ATA4 says lba is mandatory so the second check
1997 		 * should never trigger.
1998 		 */
1999 		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
2000 			err_mask = ata_dev_init_params(dev, id[3], id[6]);
2001 			if (err_mask) {
2002 				rc = -EIO;
2003 				reason = "INIT_DEV_PARAMS failed";
2004 				goto err_out;
2005 			}
2006 
2007 			/* current CHS translation info (id[53-58]) might be
2008 			 * changed. reread the identify device info.
2009 			 */
2010 			flags &= ~ATA_READID_POSTRESET;
2011 			goto retry;
2012 		}
2013 	}
2014 
2015 	*p_class = class;
2016 
2017 	return 0;
2018 
2019  err_out:
2020 	if (ata_msg_warn(ap))
2021 		ata_dev_warn(dev, "failed to IDENTIFY (%s, err_mask=0x%x)\n",
2022 			     reason, err_mask);
2023 	return rc;
2024 }
2025 
2026 /**
2027  *	ata_read_log_page - read a specific log page
2028  *	@dev: target device
2029  *	@log: log to read
2030  *	@page: page to read
2031  *	@buf: buffer to store read page
2032  *	@sectors: number of sectors to read
2033  *
2034  *	Read log page using READ_LOG_EXT command.
2035  *
2036  *	LOCKING:
2037  *	Kernel thread context (may sleep).
2038  *
2039  *	RETURNS:
2040  *	0 on success, AC_ERR_* mask otherwise.
2041  */
ata_read_log_page(struct ata_device * dev,u8 log,u8 page,void * buf,unsigned int sectors)2042 unsigned int ata_read_log_page(struct ata_device *dev, u8 log,
2043 			       u8 page, void *buf, unsigned int sectors)
2044 {
2045 	unsigned long ap_flags = dev->link->ap->flags;
2046 	struct ata_taskfile tf;
2047 	unsigned int err_mask;
2048 	bool dma = false;
2049 
2050 	DPRINTK("read log page - log 0x%x, page 0x%x\n", log, page);
2051 
2052 	/*
2053 	 * Return error without actually issuing the command on controllers
2054 	 * which e.g. lockup on a read log page.
2055 	 */
2056 	if (ap_flags & ATA_FLAG_NO_LOG_PAGE)
2057 		return AC_ERR_DEV;
2058 
2059 retry:
2060 	ata_tf_init(dev, &tf);
2061 	if (dev->dma_mode && ata_id_has_read_log_dma_ext(dev->id) &&
2062 	    !(dev->horkage & ATA_HORKAGE_NO_DMA_LOG)) {
2063 		tf.command = ATA_CMD_READ_LOG_DMA_EXT;
2064 		tf.protocol = ATA_PROT_DMA;
2065 		dma = true;
2066 	} else {
2067 		tf.command = ATA_CMD_READ_LOG_EXT;
2068 		tf.protocol = ATA_PROT_PIO;
2069 		dma = false;
2070 	}
2071 	tf.lbal = log;
2072 	tf.lbam = page;
2073 	tf.nsect = sectors;
2074 	tf.hob_nsect = sectors >> 8;
2075 	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_LBA48 | ATA_TFLAG_DEVICE;
2076 
2077 	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
2078 				     buf, sectors * ATA_SECT_SIZE, 0);
2079 
2080 	if (err_mask && dma) {
2081 		dev->horkage |= ATA_HORKAGE_NO_DMA_LOG;
2082 		ata_dev_warn(dev, "READ LOG DMA EXT failed, trying PIO\n");
2083 		goto retry;
2084 	}
2085 
2086 	DPRINTK("EXIT, err_mask=%x\n", err_mask);
2087 	return err_mask;
2088 }
2089 
ata_log_supported(struct ata_device * dev,u8 log)2090 static bool ata_log_supported(struct ata_device *dev, u8 log)
2091 {
2092 	struct ata_port *ap = dev->link->ap;
2093 
2094 	if (ata_read_log_page(dev, ATA_LOG_DIRECTORY, 0, ap->sector_buf, 1))
2095 		return false;
2096 	return get_unaligned_le16(&ap->sector_buf[log * 2]) ? true : false;
2097 }
2098 
ata_identify_page_supported(struct ata_device * dev,u8 page)2099 static bool ata_identify_page_supported(struct ata_device *dev, u8 page)
2100 {
2101 	struct ata_port *ap = dev->link->ap;
2102 	unsigned int err, i;
2103 
2104 	if (!ata_log_supported(dev, ATA_LOG_IDENTIFY_DEVICE)) {
2105 		ata_dev_warn(dev, "ATA Identify Device Log not supported\n");
2106 		return false;
2107 	}
2108 
2109 	/*
2110 	 * Read IDENTIFY DEVICE data log, page 0, to figure out if the page is
2111 	 * supported.
2112 	 */
2113 	err = ata_read_log_page(dev, ATA_LOG_IDENTIFY_DEVICE, 0, ap->sector_buf,
2114 				1);
2115 	if (err) {
2116 		ata_dev_info(dev,
2117 			     "failed to get Device Identify Log Emask 0x%x\n",
2118 			     err);
2119 		return false;
2120 	}
2121 
2122 	for (i = 0; i < ap->sector_buf[8]; i++) {
2123 		if (ap->sector_buf[9 + i] == page)
2124 			return true;
2125 	}
2126 
2127 	return false;
2128 }
2129 
ata_do_link_spd_horkage(struct ata_device * dev)2130 static int ata_do_link_spd_horkage(struct ata_device *dev)
2131 {
2132 	struct ata_link *plink = ata_dev_phys_link(dev);
2133 	u32 target, target_limit;
2134 
2135 	if (!sata_scr_valid(plink))
2136 		return 0;
2137 
2138 	if (dev->horkage & ATA_HORKAGE_1_5_GBPS)
2139 		target = 1;
2140 	else
2141 		return 0;
2142 
2143 	target_limit = (1 << target) - 1;
2144 
2145 	/* if already on stricter limit, no need to push further */
2146 	if (plink->sata_spd_limit <= target_limit)
2147 		return 0;
2148 
2149 	plink->sata_spd_limit = target_limit;
2150 
2151 	/* Request another EH round by returning -EAGAIN if link is
2152 	 * going faster than the target speed.  Forward progress is
2153 	 * guaranteed by setting sata_spd_limit to target_limit above.
2154 	 */
2155 	if (plink->sata_spd > target) {
2156 		ata_dev_info(dev, "applying link speed limit horkage to %s\n",
2157 			     sata_spd_string(target));
2158 		return -EAGAIN;
2159 	}
2160 	return 0;
2161 }
2162 
ata_dev_knobble(struct ata_device * dev)2163 static inline u8 ata_dev_knobble(struct ata_device *dev)
2164 {
2165 	struct ata_port *ap = dev->link->ap;
2166 
2167 	if (ata_dev_blacklisted(dev) & ATA_HORKAGE_BRIDGE_OK)
2168 		return 0;
2169 
2170 	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2171 }
2172 
ata_dev_config_ncq_send_recv(struct ata_device * dev)2173 static void ata_dev_config_ncq_send_recv(struct ata_device *dev)
2174 {
2175 	struct ata_port *ap = dev->link->ap;
2176 	unsigned int err_mask;
2177 
2178 	if (!ata_log_supported(dev, ATA_LOG_NCQ_SEND_RECV)) {
2179 		ata_dev_warn(dev, "NCQ Send/Recv Log not supported\n");
2180 		return;
2181 	}
2182 	err_mask = ata_read_log_page(dev, ATA_LOG_NCQ_SEND_RECV,
2183 				     0, ap->sector_buf, 1);
2184 	if (err_mask) {
2185 		ata_dev_dbg(dev,
2186 			    "failed to get NCQ Send/Recv Log Emask 0x%x\n",
2187 			    err_mask);
2188 	} else {
2189 		u8 *cmds = dev->ncq_send_recv_cmds;
2190 
2191 		dev->flags |= ATA_DFLAG_NCQ_SEND_RECV;
2192 		memcpy(cmds, ap->sector_buf, ATA_LOG_NCQ_SEND_RECV_SIZE);
2193 
2194 		if (dev->horkage & ATA_HORKAGE_NO_NCQ_TRIM) {
2195 			ata_dev_dbg(dev, "disabling queued TRIM support\n");
2196 			cmds[ATA_LOG_NCQ_SEND_RECV_DSM_OFFSET] &=
2197 				~ATA_LOG_NCQ_SEND_RECV_DSM_TRIM;
2198 		}
2199 	}
2200 }
2201 
ata_dev_config_ncq_non_data(struct ata_device * dev)2202 static void ata_dev_config_ncq_non_data(struct ata_device *dev)
2203 {
2204 	struct ata_port *ap = dev->link->ap;
2205 	unsigned int err_mask;
2206 
2207 	if (!ata_log_supported(dev, ATA_LOG_NCQ_NON_DATA)) {
2208 		ata_dev_warn(dev,
2209 			     "NCQ Send/Recv Log not supported\n");
2210 		return;
2211 	}
2212 	err_mask = ata_read_log_page(dev, ATA_LOG_NCQ_NON_DATA,
2213 				     0, ap->sector_buf, 1);
2214 	if (err_mask) {
2215 		ata_dev_dbg(dev,
2216 			    "failed to get NCQ Non-Data Log Emask 0x%x\n",
2217 			    err_mask);
2218 	} else {
2219 		u8 *cmds = dev->ncq_non_data_cmds;
2220 
2221 		memcpy(cmds, ap->sector_buf, ATA_LOG_NCQ_NON_DATA_SIZE);
2222 	}
2223 }
2224 
ata_dev_config_ncq_prio(struct ata_device * dev)2225 static void ata_dev_config_ncq_prio(struct ata_device *dev)
2226 {
2227 	struct ata_port *ap = dev->link->ap;
2228 	unsigned int err_mask;
2229 
2230 	if (!(dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLE)) {
2231 		dev->flags &= ~ATA_DFLAG_NCQ_PRIO;
2232 		return;
2233 	}
2234 
2235 	err_mask = ata_read_log_page(dev,
2236 				     ATA_LOG_IDENTIFY_DEVICE,
2237 				     ATA_LOG_SATA_SETTINGS,
2238 				     ap->sector_buf,
2239 				     1);
2240 	if (err_mask) {
2241 		ata_dev_dbg(dev,
2242 			    "failed to get Identify Device data, Emask 0x%x\n",
2243 			    err_mask);
2244 		return;
2245 	}
2246 
2247 	if (ap->sector_buf[ATA_LOG_NCQ_PRIO_OFFSET] & BIT(3)) {
2248 		dev->flags |= ATA_DFLAG_NCQ_PRIO;
2249 	} else {
2250 		dev->flags &= ~ATA_DFLAG_NCQ_PRIO;
2251 		ata_dev_dbg(dev, "SATA page does not support priority\n");
2252 	}
2253 
2254 }
2255 
ata_dev_config_ncq(struct ata_device * dev,char * desc,size_t desc_sz)2256 static int ata_dev_config_ncq(struct ata_device *dev,
2257 			       char *desc, size_t desc_sz)
2258 {
2259 	struct ata_port *ap = dev->link->ap;
2260 	int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
2261 	unsigned int err_mask;
2262 	char *aa_desc = "";
2263 
2264 	if (!ata_id_has_ncq(dev->id)) {
2265 		desc[0] = '\0';
2266 		return 0;
2267 	}
2268 	if (dev->horkage & ATA_HORKAGE_NONCQ) {
2269 		snprintf(desc, desc_sz, "NCQ (not used)");
2270 		return 0;
2271 	}
2272 	if (ap->flags & ATA_FLAG_NCQ) {
2273 		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE);
2274 		dev->flags |= ATA_DFLAG_NCQ;
2275 	}
2276 
2277 	if (!(dev->horkage & ATA_HORKAGE_BROKEN_FPDMA_AA) &&
2278 		(ap->flags & ATA_FLAG_FPDMA_AA) &&
2279 		ata_id_has_fpdma_aa(dev->id)) {
2280 		err_mask = ata_dev_set_feature(dev, SETFEATURES_SATA_ENABLE,
2281 			SATA_FPDMA_AA);
2282 		if (err_mask) {
2283 			ata_dev_err(dev,
2284 				    "failed to enable AA (error_mask=0x%x)\n",
2285 				    err_mask);
2286 			if (err_mask != AC_ERR_DEV) {
2287 				dev->horkage |= ATA_HORKAGE_BROKEN_FPDMA_AA;
2288 				return -EIO;
2289 			}
2290 		} else
2291 			aa_desc = ", AA";
2292 	}
2293 
2294 	if (hdepth >= ddepth)
2295 		snprintf(desc, desc_sz, "NCQ (depth %d)%s", ddepth, aa_desc);
2296 	else
2297 		snprintf(desc, desc_sz, "NCQ (depth %d/%d)%s", hdepth,
2298 			ddepth, aa_desc);
2299 
2300 	if ((ap->flags & ATA_FLAG_FPDMA_AUX)) {
2301 		if (ata_id_has_ncq_send_and_recv(dev->id))
2302 			ata_dev_config_ncq_send_recv(dev);
2303 		if (ata_id_has_ncq_non_data(dev->id))
2304 			ata_dev_config_ncq_non_data(dev);
2305 		if (ata_id_has_ncq_prio(dev->id))
2306 			ata_dev_config_ncq_prio(dev);
2307 	}
2308 
2309 	return 0;
2310 }
2311 
ata_dev_config_sense_reporting(struct ata_device * dev)2312 static void ata_dev_config_sense_reporting(struct ata_device *dev)
2313 {
2314 	unsigned int err_mask;
2315 
2316 	if (!ata_id_has_sense_reporting(dev->id))
2317 		return;
2318 
2319 	if (ata_id_sense_reporting_enabled(dev->id))
2320 		return;
2321 
2322 	err_mask = ata_dev_set_feature(dev, SETFEATURE_SENSE_DATA, 0x1);
2323 	if (err_mask) {
2324 		ata_dev_dbg(dev,
2325 			    "failed to enable Sense Data Reporting, Emask 0x%x\n",
2326 			    err_mask);
2327 	}
2328 }
2329 
ata_dev_config_zac(struct ata_device * dev)2330 static void ata_dev_config_zac(struct ata_device *dev)
2331 {
2332 	struct ata_port *ap = dev->link->ap;
2333 	unsigned int err_mask;
2334 	u8 *identify_buf = ap->sector_buf;
2335 
2336 	dev->zac_zones_optimal_open = U32_MAX;
2337 	dev->zac_zones_optimal_nonseq = U32_MAX;
2338 	dev->zac_zones_max_open = U32_MAX;
2339 
2340 	/*
2341 	 * Always set the 'ZAC' flag for Host-managed devices.
2342 	 */
2343 	if (dev->class == ATA_DEV_ZAC)
2344 		dev->flags |= ATA_DFLAG_ZAC;
2345 	else if (ata_id_zoned_cap(dev->id) == 0x01)
2346 		/*
2347 		 * Check for host-aware devices.
2348 		 */
2349 		dev->flags |= ATA_DFLAG_ZAC;
2350 
2351 	if (!(dev->flags & ATA_DFLAG_ZAC))
2352 		return;
2353 
2354 	if (!ata_identify_page_supported(dev, ATA_LOG_ZONED_INFORMATION)) {
2355 		ata_dev_warn(dev,
2356 			     "ATA Zoned Information Log not supported\n");
2357 		return;
2358 	}
2359 
2360 	/*
2361 	 * Read IDENTIFY DEVICE data log, page 9 (Zoned-device information)
2362 	 */
2363 	err_mask = ata_read_log_page(dev, ATA_LOG_IDENTIFY_DEVICE,
2364 				     ATA_LOG_ZONED_INFORMATION,
2365 				     identify_buf, 1);
2366 	if (!err_mask) {
2367 		u64 zoned_cap, opt_open, opt_nonseq, max_open;
2368 
2369 		zoned_cap = get_unaligned_le64(&identify_buf[8]);
2370 		if ((zoned_cap >> 63))
2371 			dev->zac_zoned_cap = (zoned_cap & 1);
2372 		opt_open = get_unaligned_le64(&identify_buf[24]);
2373 		if ((opt_open >> 63))
2374 			dev->zac_zones_optimal_open = (u32)opt_open;
2375 		opt_nonseq = get_unaligned_le64(&identify_buf[32]);
2376 		if ((opt_nonseq >> 63))
2377 			dev->zac_zones_optimal_nonseq = (u32)opt_nonseq;
2378 		max_open = get_unaligned_le64(&identify_buf[40]);
2379 		if ((max_open >> 63))
2380 			dev->zac_zones_max_open = (u32)max_open;
2381 	}
2382 }
2383 
ata_dev_config_trusted(struct ata_device * dev)2384 static void ata_dev_config_trusted(struct ata_device *dev)
2385 {
2386 	struct ata_port *ap = dev->link->ap;
2387 	u64 trusted_cap;
2388 	unsigned int err;
2389 
2390 	if (!ata_id_has_trusted(dev->id))
2391 		return;
2392 
2393 	if (!ata_identify_page_supported(dev, ATA_LOG_SECURITY)) {
2394 		ata_dev_warn(dev,
2395 			     "Security Log not supported\n");
2396 		return;
2397 	}
2398 
2399 	err = ata_read_log_page(dev, ATA_LOG_IDENTIFY_DEVICE, ATA_LOG_SECURITY,
2400 			ap->sector_buf, 1);
2401 	if (err) {
2402 		ata_dev_dbg(dev,
2403 			    "failed to read Security Log, Emask 0x%x\n", err);
2404 		return;
2405 	}
2406 
2407 	trusted_cap = get_unaligned_le64(&ap->sector_buf[40]);
2408 	if (!(trusted_cap & (1ULL << 63))) {
2409 		ata_dev_dbg(dev,
2410 			    "Trusted Computing capability qword not valid!\n");
2411 		return;
2412 	}
2413 
2414 	if (trusted_cap & (1 << 0))
2415 		dev->flags |= ATA_DFLAG_TRUSTED;
2416 }
2417 
2418 /**
2419  *	ata_dev_configure - Configure the specified ATA/ATAPI device
2420  *	@dev: Target device to configure
2421  *
2422  *	Configure @dev according to @dev->id.  Generic and low-level
2423  *	driver specific fixups are also applied.
2424  *
2425  *	LOCKING:
2426  *	Kernel thread context (may sleep)
2427  *
2428  *	RETURNS:
2429  *	0 on success, -errno otherwise
2430  */
ata_dev_configure(struct ata_device * dev)2431 int ata_dev_configure(struct ata_device *dev)
2432 {
2433 	struct ata_port *ap = dev->link->ap;
2434 	struct ata_eh_context *ehc = &dev->link->eh_context;
2435 	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2436 	const u16 *id = dev->id;
2437 	unsigned long xfer_mask;
2438 	unsigned int err_mask;
2439 	char revbuf[7];		/* XYZ-99\0 */
2440 	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
2441 	char modelbuf[ATA_ID_PROD_LEN+1];
2442 	int rc;
2443 
2444 	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
2445 		ata_dev_info(dev, "%s: ENTER/EXIT -- nodev\n", __func__);
2446 		return 0;
2447 	}
2448 
2449 	if (ata_msg_probe(ap))
2450 		ata_dev_dbg(dev, "%s: ENTER\n", __func__);
2451 
2452 	/* set horkage */
2453 	dev->horkage |= ata_dev_blacklisted(dev);
2454 	ata_force_horkage(dev);
2455 
2456 	if (dev->horkage & ATA_HORKAGE_DISABLE) {
2457 		ata_dev_info(dev, "unsupported device, disabling\n");
2458 		ata_dev_disable(dev);
2459 		return 0;
2460 	}
2461 
2462 	if ((!atapi_enabled || (ap->flags & ATA_FLAG_NO_ATAPI)) &&
2463 	    dev->class == ATA_DEV_ATAPI) {
2464 		ata_dev_warn(dev, "WARNING: ATAPI is %s, device ignored\n",
2465 			     atapi_enabled ? "not supported with this driver"
2466 			     : "disabled");
2467 		ata_dev_disable(dev);
2468 		return 0;
2469 	}
2470 
2471 	rc = ata_do_link_spd_horkage(dev);
2472 	if (rc)
2473 		return rc;
2474 
2475 	/* some WD SATA-1 drives have issues with LPM, turn on NOLPM for them */
2476 	if ((dev->horkage & ATA_HORKAGE_WD_BROKEN_LPM) &&
2477 	    (id[ATA_ID_SATA_CAPABILITY] & 0xe) == 0x2)
2478 		dev->horkage |= ATA_HORKAGE_NOLPM;
2479 
2480 	if (ap->flags & ATA_FLAG_NO_LPM)
2481 		dev->horkage |= ATA_HORKAGE_NOLPM;
2482 
2483 	if (dev->horkage & ATA_HORKAGE_NOLPM) {
2484 		ata_dev_warn(dev, "LPM support broken, forcing max_power\n");
2485 		dev->link->ap->target_lpm_policy = ATA_LPM_MAX_POWER;
2486 	}
2487 
2488 	/* let ACPI work its magic */
2489 	rc = ata_acpi_on_devcfg(dev);
2490 	if (rc)
2491 		return rc;
2492 
2493 	/* massage HPA, do it early as it might change IDENTIFY data */
2494 	rc = ata_hpa_resize(dev);
2495 	if (rc)
2496 		return rc;
2497 
2498 	/* print device capabilities */
2499 	if (ata_msg_probe(ap))
2500 		ata_dev_dbg(dev,
2501 			    "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
2502 			    "85:%04x 86:%04x 87:%04x 88:%04x\n",
2503 			    __func__,
2504 			    id[49], id[82], id[83], id[84],
2505 			    id[85], id[86], id[87], id[88]);
2506 
2507 	/* initialize to-be-configured parameters */
2508 	dev->flags &= ~ATA_DFLAG_CFG_MASK;
2509 	dev->max_sectors = 0;
2510 	dev->cdb_len = 0;
2511 	dev->n_sectors = 0;
2512 	dev->cylinders = 0;
2513 	dev->heads = 0;
2514 	dev->sectors = 0;
2515 	dev->multi_count = 0;
2516 
2517 	/*
2518 	 * common ATA, ATAPI feature tests
2519 	 */
2520 
2521 	/* find max transfer mode; for printk only */
2522 	xfer_mask = ata_id_xfermask(id);
2523 
2524 	if (ata_msg_probe(ap))
2525 		ata_dump_id(id);
2526 
2527 	/* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
2528 	ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
2529 			sizeof(fwrevbuf));
2530 
2531 	ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
2532 			sizeof(modelbuf));
2533 
2534 	/* ATA-specific feature tests */
2535 	if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) {
2536 		if (ata_id_is_cfa(id)) {
2537 			/* CPRM may make this media unusable */
2538 			if (id[ATA_ID_CFA_KEY_MGMT] & 1)
2539 				ata_dev_warn(dev,
2540 	"supports DRM functions and may not be fully accessible\n");
2541 			snprintf(revbuf, 7, "CFA");
2542 		} else {
2543 			snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2544 			/* Warn the user if the device has TPM extensions */
2545 			if (ata_id_has_tpm(id))
2546 				ata_dev_warn(dev,
2547 	"supports DRM functions and may not be fully accessible\n");
2548 		}
2549 
2550 		dev->n_sectors = ata_id_n_sectors(id);
2551 
2552 		/* get current R/W Multiple count setting */
2553 		if ((dev->id[47] >> 8) == 0x80 && (dev->id[59] & 0x100)) {
2554 			unsigned int max = dev->id[47] & 0xff;
2555 			unsigned int cnt = dev->id[59] & 0xff;
2556 			/* only recognize/allow powers of two here */
2557 			if (is_power_of_2(max) && is_power_of_2(cnt))
2558 				if (cnt <= max)
2559 					dev->multi_count = cnt;
2560 		}
2561 
2562 		if (ata_id_has_lba(id)) {
2563 			const char *lba_desc;
2564 			char ncq_desc[24];
2565 
2566 			lba_desc = "LBA";
2567 			dev->flags |= ATA_DFLAG_LBA;
2568 			if (ata_id_has_lba48(id)) {
2569 				dev->flags |= ATA_DFLAG_LBA48;
2570 				lba_desc = "LBA48";
2571 
2572 				if (dev->n_sectors >= (1UL << 28) &&
2573 				    ata_id_has_flush_ext(id))
2574 					dev->flags |= ATA_DFLAG_FLUSH_EXT;
2575 			}
2576 
2577 			/* config NCQ */
2578 			rc = ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
2579 			if (rc)
2580 				return rc;
2581 
2582 			/* print device info to dmesg */
2583 			if (ata_msg_drv(ap) && print_info) {
2584 				ata_dev_info(dev, "%s: %s, %s, max %s\n",
2585 					     revbuf, modelbuf, fwrevbuf,
2586 					     ata_mode_string(xfer_mask));
2587 				ata_dev_info(dev,
2588 					     "%llu sectors, multi %u: %s %s\n",
2589 					(unsigned long long)dev->n_sectors,
2590 					dev->multi_count, lba_desc, ncq_desc);
2591 			}
2592 		} else {
2593 			/* CHS */
2594 
2595 			/* Default translation */
2596 			dev->cylinders	= id[1];
2597 			dev->heads	= id[3];
2598 			dev->sectors	= id[6];
2599 
2600 			if (ata_id_current_chs_valid(id)) {
2601 				/* Current CHS translation is valid. */
2602 				dev->cylinders = id[54];
2603 				dev->heads     = id[55];
2604 				dev->sectors   = id[56];
2605 			}
2606 
2607 			/* print device info to dmesg */
2608 			if (ata_msg_drv(ap) && print_info) {
2609 				ata_dev_info(dev, "%s: %s, %s, max %s\n",
2610 					     revbuf,	modelbuf, fwrevbuf,
2611 					     ata_mode_string(xfer_mask));
2612 				ata_dev_info(dev,
2613 					     "%llu sectors, multi %u, CHS %u/%u/%u\n",
2614 					     (unsigned long long)dev->n_sectors,
2615 					     dev->multi_count, dev->cylinders,
2616 					     dev->heads, dev->sectors);
2617 			}
2618 		}
2619 
2620 		/* Check and mark DevSlp capability. Get DevSlp timing variables
2621 		 * from SATA Settings page of Identify Device Data Log.
2622 		 */
2623 		if (ata_id_has_devslp(dev->id)) {
2624 			u8 *sata_setting = ap->sector_buf;
2625 			int i, j;
2626 
2627 			dev->flags |= ATA_DFLAG_DEVSLP;
2628 			err_mask = ata_read_log_page(dev,
2629 						     ATA_LOG_IDENTIFY_DEVICE,
2630 						     ATA_LOG_SATA_SETTINGS,
2631 						     sata_setting,
2632 						     1);
2633 			if (err_mask)
2634 				ata_dev_dbg(dev,
2635 					    "failed to get Identify Device Data, Emask 0x%x\n",
2636 					    err_mask);
2637 			else
2638 				for (i = 0; i < ATA_LOG_DEVSLP_SIZE; i++) {
2639 					j = ATA_LOG_DEVSLP_OFFSET + i;
2640 					dev->devslp_timing[i] = sata_setting[j];
2641 				}
2642 		}
2643 		ata_dev_config_sense_reporting(dev);
2644 		ata_dev_config_zac(dev);
2645 		ata_dev_config_trusted(dev);
2646 		dev->cdb_len = 32;
2647 	}
2648 
2649 	/* ATAPI-specific feature tests */
2650 	else if (dev->class == ATA_DEV_ATAPI) {
2651 		const char *cdb_intr_string = "";
2652 		const char *atapi_an_string = "";
2653 		const char *dma_dir_string = "";
2654 		u32 sntf;
2655 
2656 		rc = atapi_cdb_len(id);
2657 		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2658 			if (ata_msg_warn(ap))
2659 				ata_dev_warn(dev, "unsupported CDB len\n");
2660 			rc = -EINVAL;
2661 			goto err_out_nosup;
2662 		}
2663 		dev->cdb_len = (unsigned int) rc;
2664 
2665 		/* Enable ATAPI AN if both the host and device have
2666 		 * the support.  If PMP is attached, SNTF is required
2667 		 * to enable ATAPI AN to discern between PHY status
2668 		 * changed notifications and ATAPI ANs.
2669 		 */
2670 		if (atapi_an &&
2671 		    (ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
2672 		    (!sata_pmp_attached(ap) ||
2673 		     sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
2674 			/* issue SET feature command to turn this on */
2675 			err_mask = ata_dev_set_feature(dev,
2676 					SETFEATURES_SATA_ENABLE, SATA_AN);
2677 			if (err_mask)
2678 				ata_dev_err(dev,
2679 					    "failed to enable ATAPI AN (err_mask=0x%x)\n",
2680 					    err_mask);
2681 			else {
2682 				dev->flags |= ATA_DFLAG_AN;
2683 				atapi_an_string = ", ATAPI AN";
2684 			}
2685 		}
2686 
2687 		if (ata_id_cdb_intr(dev->id)) {
2688 			dev->flags |= ATA_DFLAG_CDB_INTR;
2689 			cdb_intr_string = ", CDB intr";
2690 		}
2691 
2692 		if (atapi_dmadir || (dev->horkage & ATA_HORKAGE_ATAPI_DMADIR) || atapi_id_dmadir(dev->id)) {
2693 			dev->flags |= ATA_DFLAG_DMADIR;
2694 			dma_dir_string = ", DMADIR";
2695 		}
2696 
2697 		if (ata_id_has_da(dev->id)) {
2698 			dev->flags |= ATA_DFLAG_DA;
2699 			zpodd_init(dev);
2700 		}
2701 
2702 		/* print device info to dmesg */
2703 		if (ata_msg_drv(ap) && print_info)
2704 			ata_dev_info(dev,
2705 				     "ATAPI: %s, %s, max %s%s%s%s\n",
2706 				     modelbuf, fwrevbuf,
2707 				     ata_mode_string(xfer_mask),
2708 				     cdb_intr_string, atapi_an_string,
2709 				     dma_dir_string);
2710 	}
2711 
2712 	/* determine max_sectors */
2713 	dev->max_sectors = ATA_MAX_SECTORS;
2714 	if (dev->flags & ATA_DFLAG_LBA48)
2715 		dev->max_sectors = ATA_MAX_SECTORS_LBA48;
2716 
2717 	/* Limit PATA drive on SATA cable bridge transfers to udma5,
2718 	   200 sectors */
2719 	if (ata_dev_knobble(dev)) {
2720 		if (ata_msg_drv(ap) && print_info)
2721 			ata_dev_info(dev, "applying bridge limits\n");
2722 		dev->udma_mask &= ATA_UDMA5;
2723 		dev->max_sectors = ATA_MAX_SECTORS;
2724 	}
2725 
2726 	if ((dev->class == ATA_DEV_ATAPI) &&
2727 	    (atapi_command_packet_set(id) == TYPE_TAPE)) {
2728 		dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2729 		dev->horkage |= ATA_HORKAGE_STUCK_ERR;
2730 	}
2731 
2732 	if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2733 		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
2734 					 dev->max_sectors);
2735 
2736 	if (dev->horkage & ATA_HORKAGE_MAX_SEC_1024)
2737 		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_1024,
2738 					 dev->max_sectors);
2739 
2740 	if (dev->horkage & ATA_HORKAGE_MAX_SEC_LBA48)
2741 		dev->max_sectors = ATA_MAX_SECTORS_LBA48;
2742 
2743 	if (ap->ops->dev_config)
2744 		ap->ops->dev_config(dev);
2745 
2746 	if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
2747 		/* Let the user know. We don't want to disallow opens for
2748 		   rescue purposes, or in case the vendor is just a blithering
2749 		   idiot. Do this after the dev_config call as some controllers
2750 		   with buggy firmware may want to avoid reporting false device
2751 		   bugs */
2752 
2753 		if (print_info) {
2754 			ata_dev_warn(dev,
2755 "Drive reports diagnostics failure. This may indicate a drive\n");
2756 			ata_dev_warn(dev,
2757 "fault or invalid emulation. Contact drive vendor for information.\n");
2758 		}
2759 	}
2760 
2761 	if ((dev->horkage & ATA_HORKAGE_FIRMWARE_WARN) && print_info) {
2762 		ata_dev_warn(dev, "WARNING: device requires firmware update to be fully functional\n");
2763 		ata_dev_warn(dev, "         contact the vendor or visit http://ata.wiki.kernel.org\n");
2764 	}
2765 
2766 	return 0;
2767 
2768 err_out_nosup:
2769 	if (ata_msg_probe(ap))
2770 		ata_dev_dbg(dev, "%s: EXIT, err\n", __func__);
2771 	return rc;
2772 }
2773 
2774 /**
2775  *	ata_cable_40wire	-	return 40 wire cable type
2776  *	@ap: port
2777  *
2778  *	Helper method for drivers which want to hardwire 40 wire cable
2779  *	detection.
2780  */
2781 
ata_cable_40wire(struct ata_port * ap)2782 int ata_cable_40wire(struct ata_port *ap)
2783 {
2784 	return ATA_CBL_PATA40;
2785 }
2786 
2787 /**
2788  *	ata_cable_80wire	-	return 80 wire cable type
2789  *	@ap: port
2790  *
2791  *	Helper method for drivers which want to hardwire 80 wire cable
2792  *	detection.
2793  */
2794 
ata_cable_80wire(struct ata_port * ap)2795 int ata_cable_80wire(struct ata_port *ap)
2796 {
2797 	return ATA_CBL_PATA80;
2798 }
2799 
2800 /**
2801  *	ata_cable_unknown	-	return unknown PATA cable.
2802  *	@ap: port
2803  *
2804  *	Helper method for drivers which have no PATA cable detection.
2805  */
2806 
ata_cable_unknown(struct ata_port * ap)2807 int ata_cable_unknown(struct ata_port *ap)
2808 {
2809 	return ATA_CBL_PATA_UNK;
2810 }
2811 
2812 /**
2813  *	ata_cable_ignore	-	return ignored PATA cable.
2814  *	@ap: port
2815  *
2816  *	Helper method for drivers which don't use cable type to limit
2817  *	transfer mode.
2818  */
ata_cable_ignore(struct ata_port * ap)2819 int ata_cable_ignore(struct ata_port *ap)
2820 {
2821 	return ATA_CBL_PATA_IGN;
2822 }
2823 
2824 /**
2825  *	ata_cable_sata	-	return SATA cable type
2826  *	@ap: port
2827  *
2828  *	Helper method for drivers which have SATA cables
2829  */
2830 
ata_cable_sata(struct ata_port * ap)2831 int ata_cable_sata(struct ata_port *ap)
2832 {
2833 	return ATA_CBL_SATA;
2834 }
2835 
2836 /**
2837  *	ata_bus_probe - Reset and probe ATA bus
2838  *	@ap: Bus to probe
2839  *
2840  *	Master ATA bus probing function.  Initiates a hardware-dependent
2841  *	bus reset, then attempts to identify any devices found on
2842  *	the bus.
2843  *
2844  *	LOCKING:
2845  *	PCI/etc. bus probe sem.
2846  *
2847  *	RETURNS:
2848  *	Zero on success, negative errno otherwise.
2849  */
2850 
ata_bus_probe(struct ata_port * ap)2851 int ata_bus_probe(struct ata_port *ap)
2852 {
2853 	unsigned int classes[ATA_MAX_DEVICES];
2854 	int tries[ATA_MAX_DEVICES];
2855 	int rc;
2856 	struct ata_device *dev;
2857 
2858 	ata_for_each_dev(dev, &ap->link, ALL)
2859 		tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2860 
2861  retry:
2862 	ata_for_each_dev(dev, &ap->link, ALL) {
2863 		/* If we issue an SRST then an ATA drive (not ATAPI)
2864 		 * may change configuration and be in PIO0 timing. If
2865 		 * we do a hard reset (or are coming from power on)
2866 		 * this is true for ATA or ATAPI. Until we've set a
2867 		 * suitable controller mode we should not touch the
2868 		 * bus as we may be talking too fast.
2869 		 */
2870 		dev->pio_mode = XFER_PIO_0;
2871 		dev->dma_mode = 0xff;
2872 
2873 		/* If the controller has a pio mode setup function
2874 		 * then use it to set the chipset to rights. Don't
2875 		 * touch the DMA setup as that will be dealt with when
2876 		 * configuring devices.
2877 		 */
2878 		if (ap->ops->set_piomode)
2879 			ap->ops->set_piomode(ap, dev);
2880 	}
2881 
2882 	/* reset and determine device classes */
2883 	ap->ops->phy_reset(ap);
2884 
2885 	ata_for_each_dev(dev, &ap->link, ALL) {
2886 		if (dev->class != ATA_DEV_UNKNOWN)
2887 			classes[dev->devno] = dev->class;
2888 		else
2889 			classes[dev->devno] = ATA_DEV_NONE;
2890 
2891 		dev->class = ATA_DEV_UNKNOWN;
2892 	}
2893 
2894 	/* read IDENTIFY page and configure devices. We have to do the identify
2895 	   specific sequence bass-ackwards so that PDIAG- is released by
2896 	   the slave device */
2897 
2898 	ata_for_each_dev(dev, &ap->link, ALL_REVERSE) {
2899 		if (tries[dev->devno])
2900 			dev->class = classes[dev->devno];
2901 
2902 		if (!ata_dev_enabled(dev))
2903 			continue;
2904 
2905 		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
2906 				     dev->id);
2907 		if (rc)
2908 			goto fail;
2909 	}
2910 
2911 	/* Now ask for the cable type as PDIAG- should have been released */
2912 	if (ap->ops->cable_detect)
2913 		ap->cbl = ap->ops->cable_detect(ap);
2914 
2915 	/* We may have SATA bridge glue hiding here irrespective of
2916 	 * the reported cable types and sensed types.  When SATA
2917 	 * drives indicate we have a bridge, we don't know which end
2918 	 * of the link the bridge is which is a problem.
2919 	 */
2920 	ata_for_each_dev(dev, &ap->link, ENABLED)
2921 		if (ata_id_is_sata(dev->id))
2922 			ap->cbl = ATA_CBL_SATA;
2923 
2924 	/* After the identify sequence we can now set up the devices. We do
2925 	   this in the normal order so that the user doesn't get confused */
2926 
2927 	ata_for_each_dev(dev, &ap->link, ENABLED) {
2928 		ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2929 		rc = ata_dev_configure(dev);
2930 		ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2931 		if (rc)
2932 			goto fail;
2933 	}
2934 
2935 	/* configure transfer mode */
2936 	rc = ata_set_mode(&ap->link, &dev);
2937 	if (rc)
2938 		goto fail;
2939 
2940 	ata_for_each_dev(dev, &ap->link, ENABLED)
2941 		return 0;
2942 
2943 	return -ENODEV;
2944 
2945  fail:
2946 	tries[dev->devno]--;
2947 
2948 	switch (rc) {
2949 	case -EINVAL:
2950 		/* eeek, something went very wrong, give up */
2951 		tries[dev->devno] = 0;
2952 		break;
2953 
2954 	case -ENODEV:
2955 		/* give it just one more chance */
2956 		tries[dev->devno] = min(tries[dev->devno], 1);
2957 		/* fall through */
2958 	case -EIO:
2959 		if (tries[dev->devno] == 1) {
2960 			/* This is the last chance, better to slow
2961 			 * down than lose it.
2962 			 */
2963 			sata_down_spd_limit(&ap->link, 0);
2964 			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
2965 		}
2966 	}
2967 
2968 	if (!tries[dev->devno])
2969 		ata_dev_disable(dev);
2970 
2971 	goto retry;
2972 }
2973 
2974 /**
2975  *	sata_print_link_status - Print SATA link status
2976  *	@link: SATA link to printk link status about
2977  *
2978  *	This function prints link speed and status of a SATA link.
2979  *
2980  *	LOCKING:
2981  *	None.
2982  */
sata_print_link_status(struct ata_link * link)2983 static void sata_print_link_status(struct ata_link *link)
2984 {
2985 	u32 sstatus, scontrol, tmp;
2986 
2987 	if (sata_scr_read(link, SCR_STATUS, &sstatus))
2988 		return;
2989 	sata_scr_read(link, SCR_CONTROL, &scontrol);
2990 
2991 	if (ata_phys_link_online(link)) {
2992 		tmp = (sstatus >> 4) & 0xf;
2993 		ata_link_info(link, "SATA link up %s (SStatus %X SControl %X)\n",
2994 			      sata_spd_string(tmp), sstatus, scontrol);
2995 	} else {
2996 		ata_link_info(link, "SATA link down (SStatus %X SControl %X)\n",
2997 			      sstatus, scontrol);
2998 	}
2999 }
3000 
3001 /**
3002  *	ata_dev_pair		-	return other device on cable
3003  *	@adev: device
3004  *
3005  *	Obtain the other device on the same cable, or if none is
3006  *	present NULL is returned
3007  */
3008 
ata_dev_pair(struct ata_device * adev)3009 struct ata_device *ata_dev_pair(struct ata_device *adev)
3010 {
3011 	struct ata_link *link = adev->link;
3012 	struct ata_device *pair = &link->device[1 - adev->devno];
3013 	if (!ata_dev_enabled(pair))
3014 		return NULL;
3015 	return pair;
3016 }
3017 
3018 /**
3019  *	sata_down_spd_limit - adjust SATA spd limit downward
3020  *	@link: Link to adjust SATA spd limit for
3021  *	@spd_limit: Additional limit
3022  *
3023  *	Adjust SATA spd limit of @link downward.  Note that this
3024  *	function only adjusts the limit.  The change must be applied
3025  *	using sata_set_spd().
3026  *
3027  *	If @spd_limit is non-zero, the speed is limited to equal to or
3028  *	lower than @spd_limit if such speed is supported.  If
3029  *	@spd_limit is slower than any supported speed, only the lowest
3030  *	supported speed is allowed.
3031  *
3032  *	LOCKING:
3033  *	Inherited from caller.
3034  *
3035  *	RETURNS:
3036  *	0 on success, negative errno on failure
3037  */
sata_down_spd_limit(struct ata_link * link,u32 spd_limit)3038 int sata_down_spd_limit(struct ata_link *link, u32 spd_limit)
3039 {
3040 	u32 sstatus, spd, mask;
3041 	int rc, bit;
3042 
3043 	if (!sata_scr_valid(link))
3044 		return -EOPNOTSUPP;
3045 
3046 	/* If SCR can be read, use it to determine the current SPD.
3047 	 * If not, use cached value in link->sata_spd.
3048 	 */
3049 	rc = sata_scr_read(link, SCR_STATUS, &sstatus);
3050 	if (rc == 0 && ata_sstatus_online(sstatus))
3051 		spd = (sstatus >> 4) & 0xf;
3052 	else
3053 		spd = link->sata_spd;
3054 
3055 	mask = link->sata_spd_limit;
3056 	if (mask <= 1)
3057 		return -EINVAL;
3058 
3059 	/* unconditionally mask off the highest bit */
3060 	bit = fls(mask) - 1;
3061 	mask &= ~(1 << bit);
3062 
3063 	/*
3064 	 * Mask off all speeds higher than or equal to the current one.  At
3065 	 * this point, if current SPD is not available and we previously
3066 	 * recorded the link speed from SStatus, the driver has already
3067 	 * masked off the highest bit so mask should already be 1 or 0.
3068 	 * Otherwise, we should not force 1.5Gbps on a link where we have
3069 	 * not previously recorded speed from SStatus.  Just return in this
3070 	 * case.
3071 	 */
3072 	if (spd > 1)
3073 		mask &= (1 << (spd - 1)) - 1;
3074 	else
3075 		return -EINVAL;
3076 
3077 	/* were we already at the bottom? */
3078 	if (!mask)
3079 		return -EINVAL;
3080 
3081 	if (spd_limit) {
3082 		if (mask & ((1 << spd_limit) - 1))
3083 			mask &= (1 << spd_limit) - 1;
3084 		else {
3085 			bit = ffs(mask) - 1;
3086 			mask = 1 << bit;
3087 		}
3088 	}
3089 
3090 	link->sata_spd_limit = mask;
3091 
3092 	ata_link_warn(link, "limiting SATA link speed to %s\n",
3093 		      sata_spd_string(fls(mask)));
3094 
3095 	return 0;
3096 }
3097 
__sata_set_spd_needed(struct ata_link * link,u32 * scontrol)3098 static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
3099 {
3100 	struct ata_link *host_link = &link->ap->link;
3101 	u32 limit, target, spd;
3102 
3103 	limit = link->sata_spd_limit;
3104 
3105 	/* Don't configure downstream link faster than upstream link.
3106 	 * It doesn't speed up anything and some PMPs choke on such
3107 	 * configuration.
3108 	 */
3109 	if (!ata_is_host_link(link) && host_link->sata_spd)
3110 		limit &= (1 << host_link->sata_spd) - 1;
3111 
3112 	if (limit == UINT_MAX)
3113 		target = 0;
3114 	else
3115 		target = fls(limit);
3116 
3117 	spd = (*scontrol >> 4) & 0xf;
3118 	*scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
3119 
3120 	return spd != target;
3121 }
3122 
3123 /**
3124  *	sata_set_spd_needed - is SATA spd configuration needed
3125  *	@link: Link in question
3126  *
3127  *	Test whether the spd limit in SControl matches
3128  *	@link->sata_spd_limit.  This function is used to determine
3129  *	whether hardreset is necessary to apply SATA spd
3130  *	configuration.
3131  *
3132  *	LOCKING:
3133  *	Inherited from caller.
3134  *
3135  *	RETURNS:
3136  *	1 if SATA spd configuration is needed, 0 otherwise.
3137  */
sata_set_spd_needed(struct ata_link * link)3138 static int sata_set_spd_needed(struct ata_link *link)
3139 {
3140 	u32 scontrol;
3141 
3142 	if (sata_scr_read(link, SCR_CONTROL, &scontrol))
3143 		return 1;
3144 
3145 	return __sata_set_spd_needed(link, &scontrol);
3146 }
3147 
3148 /**
3149  *	sata_set_spd - set SATA spd according to spd limit
3150  *	@link: Link to set SATA spd for
3151  *
3152  *	Set SATA spd of @link according to sata_spd_limit.
3153  *
3154  *	LOCKING:
3155  *	Inherited from caller.
3156  *
3157  *	RETURNS:
3158  *	0 if spd doesn't need to be changed, 1 if spd has been
3159  *	changed.  Negative errno if SCR registers are inaccessible.
3160  */
sata_set_spd(struct ata_link * link)3161 int sata_set_spd(struct ata_link *link)
3162 {
3163 	u32 scontrol;
3164 	int rc;
3165 
3166 	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3167 		return rc;
3168 
3169 	if (!__sata_set_spd_needed(link, &scontrol))
3170 		return 0;
3171 
3172 	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3173 		return rc;
3174 
3175 	return 1;
3176 }
3177 
3178 /*
3179  * This mode timing computation functionality is ported over from
3180  * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
3181  */
3182 /*
3183  * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
3184  * These were taken from ATA/ATAPI-6 standard, rev 0a, except
3185  * for UDMA6, which is currently supported only by Maxtor drives.
3186  *
3187  * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
3188  */
3189 
3190 static const struct ata_timing ata_timing[] = {
3191 /*	{ XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 0,  960,   0 }, */
3192 	{ XFER_PIO_0,     70, 290, 240, 600, 165, 150, 0,  600,   0 },
3193 	{ XFER_PIO_1,     50, 290,  93, 383, 125, 100, 0,  383,   0 },
3194 	{ XFER_PIO_2,     30, 290,  40, 330, 100,  90, 0,  240,   0 },
3195 	{ XFER_PIO_3,     30,  80,  70, 180,  80,  70, 0,  180,   0 },
3196 	{ XFER_PIO_4,     25,  70,  25, 120,  70,  25, 0,  120,   0 },
3197 	{ XFER_PIO_5,     15,  65,  25, 100,  65,  25, 0,  100,   0 },
3198 	{ XFER_PIO_6,     10,  55,  20,  80,  55,  20, 0,   80,   0 },
3199 
3200 	{ XFER_SW_DMA_0, 120,   0,   0,   0, 480, 480, 50, 960,   0 },
3201 	{ XFER_SW_DMA_1,  90,   0,   0,   0, 240, 240, 30, 480,   0 },
3202 	{ XFER_SW_DMA_2,  60,   0,   0,   0, 120, 120, 20, 240,   0 },
3203 
3204 	{ XFER_MW_DMA_0,  60,   0,   0,   0, 215, 215, 20, 480,   0 },
3205 	{ XFER_MW_DMA_1,  45,   0,   0,   0,  80,  50, 5,  150,   0 },
3206 	{ XFER_MW_DMA_2,  25,   0,   0,   0,  70,  25, 5,  120,   0 },
3207 	{ XFER_MW_DMA_3,  25,   0,   0,   0,  65,  25, 5,  100,   0 },
3208 	{ XFER_MW_DMA_4,  25,   0,   0,   0,  55,  20, 5,   80,   0 },
3209 
3210 /*	{ XFER_UDMA_SLOW,  0,   0,   0,   0,   0,   0, 0,    0, 150 }, */
3211 	{ XFER_UDMA_0,     0,   0,   0,   0,   0,   0, 0,    0, 120 },
3212 	{ XFER_UDMA_1,     0,   0,   0,   0,   0,   0, 0,    0,  80 },
3213 	{ XFER_UDMA_2,     0,   0,   0,   0,   0,   0, 0,    0,  60 },
3214 	{ XFER_UDMA_3,     0,   0,   0,   0,   0,   0, 0,    0,  45 },
3215 	{ XFER_UDMA_4,     0,   0,   0,   0,   0,   0, 0,    0,  30 },
3216 	{ XFER_UDMA_5,     0,   0,   0,   0,   0,   0, 0,    0,  20 },
3217 	{ XFER_UDMA_6,     0,   0,   0,   0,   0,   0, 0,    0,  15 },
3218 
3219 	{ 0xFF }
3220 };
3221 
3222 #define ENOUGH(v, unit)		(((v)-1)/(unit)+1)
3223 #define EZ(v, unit)		((v)?ENOUGH(((v) * 1000), unit):0)
3224 
ata_timing_quantize(const struct ata_timing * t,struct ata_timing * q,int T,int UT)3225 static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
3226 {
3227 	q->setup	= EZ(t->setup,       T);
3228 	q->act8b	= EZ(t->act8b,       T);
3229 	q->rec8b	= EZ(t->rec8b,       T);
3230 	q->cyc8b	= EZ(t->cyc8b,       T);
3231 	q->active	= EZ(t->active,      T);
3232 	q->recover	= EZ(t->recover,     T);
3233 	q->dmack_hold	= EZ(t->dmack_hold,  T);
3234 	q->cycle	= EZ(t->cycle,       T);
3235 	q->udma		= EZ(t->udma,       UT);
3236 }
3237 
ata_timing_merge(const struct ata_timing * a,const struct ata_timing * b,struct ata_timing * m,unsigned int what)3238 void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
3239 		      struct ata_timing *m, unsigned int what)
3240 {
3241 	if (what & ATA_TIMING_SETUP  ) m->setup   = max(a->setup,   b->setup);
3242 	if (what & ATA_TIMING_ACT8B  ) m->act8b   = max(a->act8b,   b->act8b);
3243 	if (what & ATA_TIMING_REC8B  ) m->rec8b   = max(a->rec8b,   b->rec8b);
3244 	if (what & ATA_TIMING_CYC8B  ) m->cyc8b   = max(a->cyc8b,   b->cyc8b);
3245 	if (what & ATA_TIMING_ACTIVE ) m->active  = max(a->active,  b->active);
3246 	if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
3247 	if (what & ATA_TIMING_DMACK_HOLD) m->dmack_hold = max(a->dmack_hold, b->dmack_hold);
3248 	if (what & ATA_TIMING_CYCLE  ) m->cycle   = max(a->cycle,   b->cycle);
3249 	if (what & ATA_TIMING_UDMA   ) m->udma    = max(a->udma,    b->udma);
3250 }
3251 
ata_timing_find_mode(u8 xfer_mode)3252 const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
3253 {
3254 	const struct ata_timing *t = ata_timing;
3255 
3256 	while (xfer_mode > t->mode)
3257 		t++;
3258 
3259 	if (xfer_mode == t->mode)
3260 		return t;
3261 
3262 	WARN_ONCE(true, "%s: unable to find timing for xfer_mode 0x%x\n",
3263 			__func__, xfer_mode);
3264 
3265 	return NULL;
3266 }
3267 
ata_timing_compute(struct ata_device * adev,unsigned short speed,struct ata_timing * t,int T,int UT)3268 int ata_timing_compute(struct ata_device *adev, unsigned short speed,
3269 		       struct ata_timing *t, int T, int UT)
3270 {
3271 	const u16 *id = adev->id;
3272 	const struct ata_timing *s;
3273 	struct ata_timing p;
3274 
3275 	/*
3276 	 * Find the mode.
3277 	 */
3278 
3279 	if (!(s = ata_timing_find_mode(speed)))
3280 		return -EINVAL;
3281 
3282 	memcpy(t, s, sizeof(*s));
3283 
3284 	/*
3285 	 * If the drive is an EIDE drive, it can tell us it needs extended
3286 	 * PIO/MW_DMA cycle timing.
3287 	 */
3288 
3289 	if (id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE drive */
3290 		memset(&p, 0, sizeof(p));
3291 
3292 		if (speed >= XFER_PIO_0 && speed < XFER_SW_DMA_0) {
3293 			if (speed <= XFER_PIO_2)
3294 				p.cycle = p.cyc8b = id[ATA_ID_EIDE_PIO];
3295 			else if ((speed <= XFER_PIO_4) ||
3296 				 (speed == XFER_PIO_5 && !ata_id_is_cfa(id)))
3297 				p.cycle = p.cyc8b = id[ATA_ID_EIDE_PIO_IORDY];
3298 		} else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2)
3299 			p.cycle = id[ATA_ID_EIDE_DMA_MIN];
3300 
3301 		ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
3302 	}
3303 
3304 	/*
3305 	 * Convert the timing to bus clock counts.
3306 	 */
3307 
3308 	ata_timing_quantize(t, t, T, UT);
3309 
3310 	/*
3311 	 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
3312 	 * S.M.A.R.T * and some other commands. We have to ensure that the
3313 	 * DMA cycle timing is slower/equal than the fastest PIO timing.
3314 	 */
3315 
3316 	if (speed > XFER_PIO_6) {
3317 		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
3318 		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
3319 	}
3320 
3321 	/*
3322 	 * Lengthen active & recovery time so that cycle time is correct.
3323 	 */
3324 
3325 	if (t->act8b + t->rec8b < t->cyc8b) {
3326 		t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
3327 		t->rec8b = t->cyc8b - t->act8b;
3328 	}
3329 
3330 	if (t->active + t->recover < t->cycle) {
3331 		t->active += (t->cycle - (t->active + t->recover)) / 2;
3332 		t->recover = t->cycle - t->active;
3333 	}
3334 
3335 	/* In a few cases quantisation may produce enough errors to
3336 	   leave t->cycle too low for the sum of active and recovery
3337 	   if so we must correct this */
3338 	if (t->active + t->recover > t->cycle)
3339 		t->cycle = t->active + t->recover;
3340 
3341 	return 0;
3342 }
3343 
3344 /**
3345  *	ata_timing_cycle2mode - find xfer mode for the specified cycle duration
3346  *	@xfer_shift: ATA_SHIFT_* value for transfer type to examine.
3347  *	@cycle: cycle duration in ns
3348  *
3349  *	Return matching xfer mode for @cycle.  The returned mode is of
3350  *	the transfer type specified by @xfer_shift.  If @cycle is too
3351  *	slow for @xfer_shift, 0xff is returned.  If @cycle is faster
3352  *	than the fastest known mode, the fasted mode is returned.
3353  *
3354  *	LOCKING:
3355  *	None.
3356  *
3357  *	RETURNS:
3358  *	Matching xfer_mode, 0xff if no match found.
3359  */
ata_timing_cycle2mode(unsigned int xfer_shift,int cycle)3360 u8 ata_timing_cycle2mode(unsigned int xfer_shift, int cycle)
3361 {
3362 	u8 base_mode = 0xff, last_mode = 0xff;
3363 	const struct ata_xfer_ent *ent;
3364 	const struct ata_timing *t;
3365 
3366 	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
3367 		if (ent->shift == xfer_shift)
3368 			base_mode = ent->base;
3369 
3370 	for (t = ata_timing_find_mode(base_mode);
3371 	     t && ata_xfer_mode2shift(t->mode) == xfer_shift; t++) {
3372 		unsigned short this_cycle;
3373 
3374 		switch (xfer_shift) {
3375 		case ATA_SHIFT_PIO:
3376 		case ATA_SHIFT_MWDMA:
3377 			this_cycle = t->cycle;
3378 			break;
3379 		case ATA_SHIFT_UDMA:
3380 			this_cycle = t->udma;
3381 			break;
3382 		default:
3383 			return 0xff;
3384 		}
3385 
3386 		if (cycle > this_cycle)
3387 			break;
3388 
3389 		last_mode = t->mode;
3390 	}
3391 
3392 	return last_mode;
3393 }
3394 
3395 /**
3396  *	ata_down_xfermask_limit - adjust dev xfer masks downward
3397  *	@dev: Device to adjust xfer masks
3398  *	@sel: ATA_DNXFER_* selector
3399  *
3400  *	Adjust xfer masks of @dev downward.  Note that this function
3401  *	does not apply the change.  Invoking ata_set_mode() afterwards
3402  *	will apply the limit.
3403  *
3404  *	LOCKING:
3405  *	Inherited from caller.
3406  *
3407  *	RETURNS:
3408  *	0 on success, negative errno on failure
3409  */
ata_down_xfermask_limit(struct ata_device * dev,unsigned int sel)3410 int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
3411 {
3412 	char buf[32];
3413 	unsigned long orig_mask, xfer_mask;
3414 	unsigned long pio_mask, mwdma_mask, udma_mask;
3415 	int quiet, highbit;
3416 
3417 	quiet = !!(sel & ATA_DNXFER_QUIET);
3418 	sel &= ~ATA_DNXFER_QUIET;
3419 
3420 	xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
3421 						  dev->mwdma_mask,
3422 						  dev->udma_mask);
3423 	ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
3424 
3425 	switch (sel) {
3426 	case ATA_DNXFER_PIO:
3427 		highbit = fls(pio_mask) - 1;
3428 		pio_mask &= ~(1 << highbit);
3429 		break;
3430 
3431 	case ATA_DNXFER_DMA:
3432 		if (udma_mask) {
3433 			highbit = fls(udma_mask) - 1;
3434 			udma_mask &= ~(1 << highbit);
3435 			if (!udma_mask)
3436 				return -ENOENT;
3437 		} else if (mwdma_mask) {
3438 			highbit = fls(mwdma_mask) - 1;
3439 			mwdma_mask &= ~(1 << highbit);
3440 			if (!mwdma_mask)
3441 				return -ENOENT;
3442 		}
3443 		break;
3444 
3445 	case ATA_DNXFER_40C:
3446 		udma_mask &= ATA_UDMA_MASK_40C;
3447 		break;
3448 
3449 	case ATA_DNXFER_FORCE_PIO0:
3450 		pio_mask &= 1;
3451 		/* fall through */
3452 	case ATA_DNXFER_FORCE_PIO:
3453 		mwdma_mask = 0;
3454 		udma_mask = 0;
3455 		break;
3456 
3457 	default:
3458 		BUG();
3459 	}
3460 
3461 	xfer_mask &= ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
3462 
3463 	if (!(xfer_mask & ATA_MASK_PIO) || xfer_mask == orig_mask)
3464 		return -ENOENT;
3465 
3466 	if (!quiet) {
3467 		if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
3468 			snprintf(buf, sizeof(buf), "%s:%s",
3469 				 ata_mode_string(xfer_mask),
3470 				 ata_mode_string(xfer_mask & ATA_MASK_PIO));
3471 		else
3472 			snprintf(buf, sizeof(buf), "%s",
3473 				 ata_mode_string(xfer_mask));
3474 
3475 		ata_dev_warn(dev, "limiting speed to %s\n", buf);
3476 	}
3477 
3478 	ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
3479 			    &dev->udma_mask);
3480 
3481 	return 0;
3482 }
3483 
ata_dev_set_mode(struct ata_device * dev)3484 static int ata_dev_set_mode(struct ata_device *dev)
3485 {
3486 	struct ata_port *ap = dev->link->ap;
3487 	struct ata_eh_context *ehc = &dev->link->eh_context;
3488 	const bool nosetxfer = dev->horkage & ATA_HORKAGE_NOSETXFER;
3489 	const char *dev_err_whine = "";
3490 	int ign_dev_err = 0;
3491 	unsigned int err_mask = 0;
3492 	int rc;
3493 
3494 	dev->flags &= ~ATA_DFLAG_PIO;
3495 	if (dev->xfer_shift == ATA_SHIFT_PIO)
3496 		dev->flags |= ATA_DFLAG_PIO;
3497 
3498 	if (nosetxfer && ap->flags & ATA_FLAG_SATA && ata_id_is_sata(dev->id))
3499 		dev_err_whine = " (SET_XFERMODE skipped)";
3500 	else {
3501 		if (nosetxfer)
3502 			ata_dev_warn(dev,
3503 				     "NOSETXFER but PATA detected - can't "
3504 				     "skip SETXFER, might malfunction\n");
3505 		err_mask = ata_dev_set_xfermode(dev);
3506 	}
3507 
3508 	if (err_mask & ~AC_ERR_DEV)
3509 		goto fail;
3510 
3511 	/* revalidate */
3512 	ehc->i.flags |= ATA_EHI_POST_SETMODE;
3513 	rc = ata_dev_revalidate(dev, ATA_DEV_UNKNOWN, 0);
3514 	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
3515 	if (rc)
3516 		return rc;
3517 
3518 	if (dev->xfer_shift == ATA_SHIFT_PIO) {
3519 		/* Old CFA may refuse this command, which is just fine */
3520 		if (ata_id_is_cfa(dev->id))
3521 			ign_dev_err = 1;
3522 		/* Catch several broken garbage emulations plus some pre
3523 		   ATA devices */
3524 		if (ata_id_major_version(dev->id) == 0 &&
3525 					dev->pio_mode <= XFER_PIO_2)
3526 			ign_dev_err = 1;
3527 		/* Some very old devices and some bad newer ones fail
3528 		   any kind of SET_XFERMODE request but support PIO0-2
3529 		   timings and no IORDY */
3530 		if (!ata_id_has_iordy(dev->id) && dev->pio_mode <= XFER_PIO_2)
3531 			ign_dev_err = 1;
3532 	}
3533 	/* Early MWDMA devices do DMA but don't allow DMA mode setting.
3534 	   Don't fail an MWDMA0 set IFF the device indicates it is in MWDMA0 */
3535 	if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3536 	    dev->dma_mode == XFER_MW_DMA_0 &&
3537 	    (dev->id[63] >> 8) & 1)
3538 		ign_dev_err = 1;
3539 
3540 	/* if the device is actually configured correctly, ignore dev err */
3541 	if (dev->xfer_mode == ata_xfer_mask2mode(ata_id_xfermask(dev->id)))
3542 		ign_dev_err = 1;
3543 
3544 	if (err_mask & AC_ERR_DEV) {
3545 		if (!ign_dev_err)
3546 			goto fail;
3547 		else
3548 			dev_err_whine = " (device error ignored)";
3549 	}
3550 
3551 	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
3552 		dev->xfer_shift, (int)dev->xfer_mode);
3553 
3554 	if (!(ehc->i.flags & ATA_EHI_QUIET) ||
3555 	    ehc->i.flags & ATA_EHI_DID_HARDRESET)
3556 		ata_dev_info(dev, "configured for %s%s\n",
3557 			     ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)),
3558 			     dev_err_whine);
3559 
3560 	return 0;
3561 
3562  fail:
3563 	ata_dev_err(dev, "failed to set xfermode (err_mask=0x%x)\n", err_mask);
3564 	return -EIO;
3565 }
3566 
3567 /**
3568  *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3569  *	@link: link on which timings will be programmed
3570  *	@r_failed_dev: out parameter for failed device
3571  *
3572  *	Standard implementation of the function used to tune and set
3573  *	ATA device disk transfer mode (PIO3, UDMA6, etc.).  If
3574  *	ata_dev_set_mode() fails, pointer to the failing device is
3575  *	returned in @r_failed_dev.
3576  *
3577  *	LOCKING:
3578  *	PCI/etc. bus probe sem.
3579  *
3580  *	RETURNS:
3581  *	0 on success, negative errno otherwise
3582  */
3583 
ata_do_set_mode(struct ata_link * link,struct ata_device ** r_failed_dev)3584 int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3585 {
3586 	struct ata_port *ap = link->ap;
3587 	struct ata_device *dev;
3588 	int rc = 0, used_dma = 0, found = 0;
3589 
3590 	/* step 1: calculate xfer_mask */
3591 	ata_for_each_dev(dev, link, ENABLED) {
3592 		unsigned long pio_mask, dma_mask;
3593 		unsigned int mode_mask;
3594 
3595 		mode_mask = ATA_DMA_MASK_ATA;
3596 		if (dev->class == ATA_DEV_ATAPI)
3597 			mode_mask = ATA_DMA_MASK_ATAPI;
3598 		else if (ata_id_is_cfa(dev->id))
3599 			mode_mask = ATA_DMA_MASK_CFA;
3600 
3601 		ata_dev_xfermask(dev);
3602 		ata_force_xfermask(dev);
3603 
3604 		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
3605 
3606 		if (libata_dma_mask & mode_mask)
3607 			dma_mask = ata_pack_xfermask(0, dev->mwdma_mask,
3608 						     dev->udma_mask);
3609 		else
3610 			dma_mask = 0;
3611 
3612 		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
3613 		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3614 
3615 		found = 1;
3616 		if (ata_dma_enabled(dev))
3617 			used_dma = 1;
3618 	}
3619 	if (!found)
3620 		goto out;
3621 
3622 	/* step 2: always set host PIO timings */
3623 	ata_for_each_dev(dev, link, ENABLED) {
3624 		if (dev->pio_mode == 0xff) {
3625 			ata_dev_warn(dev, "no PIO support\n");
3626 			rc = -EINVAL;
3627 			goto out;
3628 		}
3629 
3630 		dev->xfer_mode = dev->pio_mode;
3631 		dev->xfer_shift = ATA_SHIFT_PIO;
3632 		if (ap->ops->set_piomode)
3633 			ap->ops->set_piomode(ap, dev);
3634 	}
3635 
3636 	/* step 3: set host DMA timings */
3637 	ata_for_each_dev(dev, link, ENABLED) {
3638 		if (!ata_dma_enabled(dev))
3639 			continue;
3640 
3641 		dev->xfer_mode = dev->dma_mode;
3642 		dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
3643 		if (ap->ops->set_dmamode)
3644 			ap->ops->set_dmamode(ap, dev);
3645 	}
3646 
3647 	/* step 4: update devices' xfer mode */
3648 	ata_for_each_dev(dev, link, ENABLED) {
3649 		rc = ata_dev_set_mode(dev);
3650 		if (rc)
3651 			goto out;
3652 	}
3653 
3654 	/* Record simplex status. If we selected DMA then the other
3655 	 * host channels are not permitted to do so.
3656 	 */
3657 	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
3658 		ap->host->simplex_claimed = ap;
3659 
3660  out:
3661 	if (rc)
3662 		*r_failed_dev = dev;
3663 	return rc;
3664 }
3665 
3666 /**
3667  *	ata_wait_ready - wait for link to become ready
3668  *	@link: link to be waited on
3669  *	@deadline: deadline jiffies for the operation
3670  *	@check_ready: callback to check link readiness
3671  *
3672  *	Wait for @link to become ready.  @check_ready should return
3673  *	positive number if @link is ready, 0 if it isn't, -ENODEV if
3674  *	link doesn't seem to be occupied, other errno for other error
3675  *	conditions.
3676  *
3677  *	Transient -ENODEV conditions are allowed for
3678  *	ATA_TMOUT_FF_WAIT.
3679  *
3680  *	LOCKING:
3681  *	EH context.
3682  *
3683  *	RETURNS:
3684  *	0 if @link is ready before @deadline; otherwise, -errno.
3685  */
ata_wait_ready(struct ata_link * link,unsigned long deadline,int (* check_ready)(struct ata_link * link))3686 int ata_wait_ready(struct ata_link *link, unsigned long deadline,
3687 		   int (*check_ready)(struct ata_link *link))
3688 {
3689 	unsigned long start = jiffies;
3690 	unsigned long nodev_deadline;
3691 	int warned = 0;
3692 
3693 	/* choose which 0xff timeout to use, read comment in libata.h */
3694 	if (link->ap->host->flags & ATA_HOST_PARALLEL_SCAN)
3695 		nodev_deadline = ata_deadline(start, ATA_TMOUT_FF_WAIT_LONG);
3696 	else
3697 		nodev_deadline = ata_deadline(start, ATA_TMOUT_FF_WAIT);
3698 
3699 	/* Slave readiness can't be tested separately from master.  On
3700 	 * M/S emulation configuration, this function should be called
3701 	 * only on the master and it will handle both master and slave.
3702 	 */
3703 	WARN_ON(link == link->ap->slave_link);
3704 
3705 	if (time_after(nodev_deadline, deadline))
3706 		nodev_deadline = deadline;
3707 
3708 	while (1) {
3709 		unsigned long now = jiffies;
3710 		int ready, tmp;
3711 
3712 		ready = tmp = check_ready(link);
3713 		if (ready > 0)
3714 			return 0;
3715 
3716 		/*
3717 		 * -ENODEV could be transient.  Ignore -ENODEV if link
3718 		 * is online.  Also, some SATA devices take a long
3719 		 * time to clear 0xff after reset.  Wait for
3720 		 * ATA_TMOUT_FF_WAIT[_LONG] on -ENODEV if link isn't
3721 		 * offline.
3722 		 *
3723 		 * Note that some PATA controllers (pata_ali) explode
3724 		 * if status register is read more than once when
3725 		 * there's no device attached.
3726 		 */
3727 		if (ready == -ENODEV) {
3728 			if (ata_link_online(link))
3729 				ready = 0;
3730 			else if ((link->ap->flags & ATA_FLAG_SATA) &&
3731 				 !ata_link_offline(link) &&
3732 				 time_before(now, nodev_deadline))
3733 				ready = 0;
3734 		}
3735 
3736 		if (ready)
3737 			return ready;
3738 		if (time_after(now, deadline))
3739 			return -EBUSY;
3740 
3741 		if (!warned && time_after(now, start + 5 * HZ) &&
3742 		    (deadline - now > 3 * HZ)) {
3743 			ata_link_warn(link,
3744 				"link is slow to respond, please be patient "
3745 				"(ready=%d)\n", tmp);
3746 			warned = 1;
3747 		}
3748 
3749 		ata_msleep(link->ap, 50);
3750 	}
3751 }
3752 
3753 /**
3754  *	ata_wait_after_reset - wait for link to become ready after reset
3755  *	@link: link to be waited on
3756  *	@deadline: deadline jiffies for the operation
3757  *	@check_ready: callback to check link readiness
3758  *
3759  *	Wait for @link to become ready after reset.
3760  *
3761  *	LOCKING:
3762  *	EH context.
3763  *
3764  *	RETURNS:
3765  *	0 if @link is ready before @deadline; otherwise, -errno.
3766  */
ata_wait_after_reset(struct ata_link * link,unsigned long deadline,int (* check_ready)(struct ata_link * link))3767 int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
3768 				int (*check_ready)(struct ata_link *link))
3769 {
3770 	ata_msleep(link->ap, ATA_WAIT_AFTER_RESET);
3771 
3772 	return ata_wait_ready(link, deadline, check_ready);
3773 }
3774 
3775 /**
3776  *	sata_link_debounce - debounce SATA phy status
3777  *	@link: ATA link to debounce SATA phy status for
3778  *	@params: timing parameters { interval, duration, timeout } in msec
3779  *	@deadline: deadline jiffies for the operation
3780  *
3781  *	Make sure SStatus of @link reaches stable state, determined by
3782  *	holding the same value where DET is not 1 for @duration polled
3783  *	every @interval, before @timeout.  Timeout constraints the
3784  *	beginning of the stable state.  Because DET gets stuck at 1 on
3785  *	some controllers after hot unplugging, this functions waits
3786  *	until timeout then returns 0 if DET is stable at 1.
3787  *
3788  *	@timeout is further limited by @deadline.  The sooner of the
3789  *	two is used.
3790  *
3791  *	LOCKING:
3792  *	Kernel thread context (may sleep)
3793  *
3794  *	RETURNS:
3795  *	0 on success, -errno on failure.
3796  */
sata_link_debounce(struct ata_link * link,const unsigned long * params,unsigned long deadline)3797 int sata_link_debounce(struct ata_link *link, const unsigned long *params,
3798 		       unsigned long deadline)
3799 {
3800 	unsigned long interval = params[0];
3801 	unsigned long duration = params[1];
3802 	unsigned long last_jiffies, t;
3803 	u32 last, cur;
3804 	int rc;
3805 
3806 	t = ata_deadline(jiffies, params[2]);
3807 	if (time_before(t, deadline))
3808 		deadline = t;
3809 
3810 	if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3811 		return rc;
3812 	cur &= 0xf;
3813 
3814 	last = cur;
3815 	last_jiffies = jiffies;
3816 
3817 	while (1) {
3818 		ata_msleep(link->ap, interval);
3819 		if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3820 			return rc;
3821 		cur &= 0xf;
3822 
3823 		/* DET stable? */
3824 		if (cur == last) {
3825 			if (cur == 1 && time_before(jiffies, deadline))
3826 				continue;
3827 			if (time_after(jiffies,
3828 				       ata_deadline(last_jiffies, duration)))
3829 				return 0;
3830 			continue;
3831 		}
3832 
3833 		/* unstable, start over */
3834 		last = cur;
3835 		last_jiffies = jiffies;
3836 
3837 		/* Check deadline.  If debouncing failed, return
3838 		 * -EPIPE to tell upper layer to lower link speed.
3839 		 */
3840 		if (time_after(jiffies, deadline))
3841 			return -EPIPE;
3842 	}
3843 }
3844 
3845 /**
3846  *	sata_link_resume - resume SATA link
3847  *	@link: ATA link to resume SATA
3848  *	@params: timing parameters { interval, duration, timeout } in msec
3849  *	@deadline: deadline jiffies for the operation
3850  *
3851  *	Resume SATA phy @link and debounce it.
3852  *
3853  *	LOCKING:
3854  *	Kernel thread context (may sleep)
3855  *
3856  *	RETURNS:
3857  *	0 on success, -errno on failure.
3858  */
sata_link_resume(struct ata_link * link,const unsigned long * params,unsigned long deadline)3859 int sata_link_resume(struct ata_link *link, const unsigned long *params,
3860 		     unsigned long deadline)
3861 {
3862 	int tries = ATA_LINK_RESUME_TRIES;
3863 	u32 scontrol, serror;
3864 	int rc;
3865 
3866 	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3867 		return rc;
3868 
3869 	/*
3870 	 * Writes to SControl sometimes get ignored under certain
3871 	 * controllers (ata_piix SIDPR).  Make sure DET actually is
3872 	 * cleared.
3873 	 */
3874 	do {
3875 		scontrol = (scontrol & 0x0f0) | 0x300;
3876 		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3877 			return rc;
3878 		/*
3879 		 * Some PHYs react badly if SStatus is pounded
3880 		 * immediately after resuming.  Delay 200ms before
3881 		 * debouncing.
3882 		 */
3883 		if (!(link->flags & ATA_LFLAG_NO_DB_DELAY))
3884 			ata_msleep(link->ap, 200);
3885 
3886 		/* is SControl restored correctly? */
3887 		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3888 			return rc;
3889 	} while ((scontrol & 0xf0f) != 0x300 && --tries);
3890 
3891 	if ((scontrol & 0xf0f) != 0x300) {
3892 		ata_link_warn(link, "failed to resume link (SControl %X)\n",
3893 			     scontrol);
3894 		return 0;
3895 	}
3896 
3897 	if (tries < ATA_LINK_RESUME_TRIES)
3898 		ata_link_warn(link, "link resume succeeded after %d retries\n",
3899 			      ATA_LINK_RESUME_TRIES - tries);
3900 
3901 	if ((rc = sata_link_debounce(link, params, deadline)))
3902 		return rc;
3903 
3904 	/* clear SError, some PHYs require this even for SRST to work */
3905 	if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
3906 		rc = sata_scr_write(link, SCR_ERROR, serror);
3907 
3908 	return rc != -EINVAL ? rc : 0;
3909 }
3910 
3911 /**
3912  *	sata_link_scr_lpm - manipulate SControl IPM and SPM fields
3913  *	@link: ATA link to manipulate SControl for
3914  *	@policy: LPM policy to configure
3915  *	@spm_wakeup: initiate LPM transition to active state
3916  *
3917  *	Manipulate the IPM field of the SControl register of @link
3918  *	according to @policy.  If @policy is ATA_LPM_MAX_POWER and
3919  *	@spm_wakeup is %true, the SPM field is manipulated to wake up
3920  *	the link.  This function also clears PHYRDY_CHG before
3921  *	returning.
3922  *
3923  *	LOCKING:
3924  *	EH context.
3925  *
3926  *	RETURNS:
3927  *	0 on success, -errno otherwise.
3928  */
sata_link_scr_lpm(struct ata_link * link,enum ata_lpm_policy policy,bool spm_wakeup)3929 int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
3930 		      bool spm_wakeup)
3931 {
3932 	struct ata_eh_context *ehc = &link->eh_context;
3933 	bool woken_up = false;
3934 	u32 scontrol;
3935 	int rc;
3936 
3937 	rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
3938 	if (rc)
3939 		return rc;
3940 
3941 	switch (policy) {
3942 	case ATA_LPM_MAX_POWER:
3943 		/* disable all LPM transitions */
3944 		scontrol |= (0x7 << 8);
3945 		/* initiate transition to active state */
3946 		if (spm_wakeup) {
3947 			scontrol |= (0x4 << 12);
3948 			woken_up = true;
3949 		}
3950 		break;
3951 	case ATA_LPM_MED_POWER:
3952 		/* allow LPM to PARTIAL */
3953 		scontrol &= ~(0x1 << 8);
3954 		scontrol |= (0x6 << 8);
3955 		break;
3956 	case ATA_LPM_MED_POWER_WITH_DIPM:
3957 	case ATA_LPM_MIN_POWER_WITH_PARTIAL:
3958 	case ATA_LPM_MIN_POWER:
3959 		if (ata_link_nr_enabled(link) > 0)
3960 			/* no restrictions on LPM transitions */
3961 			scontrol &= ~(0x7 << 8);
3962 		else {
3963 			/* empty port, power off */
3964 			scontrol &= ~0xf;
3965 			scontrol |= (0x1 << 2);
3966 		}
3967 		break;
3968 	default:
3969 		WARN_ON(1);
3970 	}
3971 
3972 	rc = sata_scr_write(link, SCR_CONTROL, scontrol);
3973 	if (rc)
3974 		return rc;
3975 
3976 	/* give the link time to transit out of LPM state */
3977 	if (woken_up)
3978 		msleep(10);
3979 
3980 	/* clear PHYRDY_CHG from SError */
3981 	ehc->i.serror &= ~SERR_PHYRDY_CHG;
3982 	return sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
3983 }
3984 
3985 /**
3986  *	ata_std_prereset - prepare for reset
3987  *	@link: ATA link to be reset
3988  *	@deadline: deadline jiffies for the operation
3989  *
3990  *	@link is about to be reset.  Initialize it.  Failure from
3991  *	prereset makes libata abort whole reset sequence and give up
3992  *	that port, so prereset should be best-effort.  It does its
3993  *	best to prepare for reset sequence but if things go wrong, it
3994  *	should just whine, not fail.
3995  *
3996  *	LOCKING:
3997  *	Kernel thread context (may sleep)
3998  *
3999  *	RETURNS:
4000  *	0 on success, -errno otherwise.
4001  */
ata_std_prereset(struct ata_link * link,unsigned long deadline)4002 int ata_std_prereset(struct ata_link *link, unsigned long deadline)
4003 {
4004 	struct ata_port *ap = link->ap;
4005 	struct ata_eh_context *ehc = &link->eh_context;
4006 	const unsigned long *timing = sata_ehc_deb_timing(ehc);
4007 	int rc;
4008 
4009 	/* if we're about to do hardreset, nothing more to do */
4010 	if (ehc->i.action & ATA_EH_HARDRESET)
4011 		return 0;
4012 
4013 	/* if SATA, resume link */
4014 	if (ap->flags & ATA_FLAG_SATA) {
4015 		rc = sata_link_resume(link, timing, deadline);
4016 		/* whine about phy resume failure but proceed */
4017 		if (rc && rc != -EOPNOTSUPP)
4018 			ata_link_warn(link,
4019 				      "failed to resume link for reset (errno=%d)\n",
4020 				      rc);
4021 	}
4022 
4023 	/* no point in trying softreset on offline link */
4024 	if (ata_phys_link_offline(link))
4025 		ehc->i.action &= ~ATA_EH_SOFTRESET;
4026 
4027 	return 0;
4028 }
4029 
4030 /**
4031  *	sata_link_hardreset - reset link via SATA phy reset
4032  *	@link: link to reset
4033  *	@timing: timing parameters { interval, duration, timeout } in msec
4034  *	@deadline: deadline jiffies for the operation
4035  *	@online: optional out parameter indicating link onlineness
4036  *	@check_ready: optional callback to check link readiness
4037  *
4038  *	SATA phy-reset @link using DET bits of SControl register.
4039  *	After hardreset, link readiness is waited upon using
4040  *	ata_wait_ready() if @check_ready is specified.  LLDs are
4041  *	allowed to not specify @check_ready and wait itself after this
4042  *	function returns.  Device classification is LLD's
4043  *	responsibility.
4044  *
4045  *	*@online is set to one iff reset succeeded and @link is online
4046  *	after reset.
4047  *
4048  *	LOCKING:
4049  *	Kernel thread context (may sleep)
4050  *
4051  *	RETURNS:
4052  *	0 on success, -errno otherwise.
4053  */
sata_link_hardreset(struct ata_link * link,const unsigned long * timing,unsigned long deadline,bool * online,int (* check_ready)(struct ata_link *))4054 int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
4055 			unsigned long deadline,
4056 			bool *online, int (*check_ready)(struct ata_link *))
4057 {
4058 	u32 scontrol;
4059 	int rc;
4060 
4061 	DPRINTK("ENTER\n");
4062 
4063 	if (online)
4064 		*online = false;
4065 
4066 	if (sata_set_spd_needed(link)) {
4067 		/* SATA spec says nothing about how to reconfigure
4068 		 * spd.  To be on the safe side, turn off phy during
4069 		 * reconfiguration.  This works for at least ICH7 AHCI
4070 		 * and Sil3124.
4071 		 */
4072 		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
4073 			goto out;
4074 
4075 		scontrol = (scontrol & 0x0f0) | 0x304;
4076 
4077 		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
4078 			goto out;
4079 
4080 		sata_set_spd(link);
4081 	}
4082 
4083 	/* issue phy wake/reset */
4084 	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
4085 		goto out;
4086 
4087 	scontrol = (scontrol & 0x0f0) | 0x301;
4088 
4089 	if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
4090 		goto out;
4091 
4092 	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
4093 	 * 10.4.2 says at least 1 ms.
4094 	 */
4095 	ata_msleep(link->ap, 1);
4096 
4097 	/* bring link back */
4098 	rc = sata_link_resume(link, timing, deadline);
4099 	if (rc)
4100 		goto out;
4101 	/* if link is offline nothing more to do */
4102 	if (ata_phys_link_offline(link))
4103 		goto out;
4104 
4105 	/* Link is online.  From this point, -ENODEV too is an error. */
4106 	if (online)
4107 		*online = true;
4108 
4109 	if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
4110 		/* If PMP is supported, we have to do follow-up SRST.
4111 		 * Some PMPs don't send D2H Reg FIS after hardreset if
4112 		 * the first port is empty.  Wait only for
4113 		 * ATA_TMOUT_PMP_SRST_WAIT.
4114 		 */
4115 		if (check_ready) {
4116 			unsigned long pmp_deadline;
4117 
4118 			pmp_deadline = ata_deadline(jiffies,
4119 						    ATA_TMOUT_PMP_SRST_WAIT);
4120 			if (time_after(pmp_deadline, deadline))
4121 				pmp_deadline = deadline;
4122 			ata_wait_ready(link, pmp_deadline, check_ready);
4123 		}
4124 		rc = -EAGAIN;
4125 		goto out;
4126 	}
4127 
4128 	rc = 0;
4129 	if (check_ready)
4130 		rc = ata_wait_ready(link, deadline, check_ready);
4131  out:
4132 	if (rc && rc != -EAGAIN) {
4133 		/* online is set iff link is online && reset succeeded */
4134 		if (online)
4135 			*online = false;
4136 		ata_link_err(link, "COMRESET failed (errno=%d)\n", rc);
4137 	}
4138 	DPRINTK("EXIT, rc=%d\n", rc);
4139 	return rc;
4140 }
4141 
4142 /**
4143  *	sata_std_hardreset - COMRESET w/o waiting or classification
4144  *	@link: link to reset
4145  *	@class: resulting class of attached device
4146  *	@deadline: deadline jiffies for the operation
4147  *
4148  *	Standard SATA COMRESET w/o waiting or classification.
4149  *
4150  *	LOCKING:
4151  *	Kernel thread context (may sleep)
4152  *
4153  *	RETURNS:
4154  *	0 if link offline, -EAGAIN if link online, -errno on errors.
4155  */
sata_std_hardreset(struct ata_link * link,unsigned int * class,unsigned long deadline)4156 int sata_std_hardreset(struct ata_link *link, unsigned int *class,
4157 		       unsigned long deadline)
4158 {
4159 	const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
4160 	bool online;
4161 	int rc;
4162 
4163 	/* do hardreset */
4164 	rc = sata_link_hardreset(link, timing, deadline, &online, NULL);
4165 	return online ? -EAGAIN : rc;
4166 }
4167 
4168 /**
4169  *	ata_std_postreset - standard postreset callback
4170  *	@link: the target ata_link
4171  *	@classes: classes of attached devices
4172  *
4173  *	This function is invoked after a successful reset.  Note that
4174  *	the device might have been reset more than once using
4175  *	different reset methods before postreset is invoked.
4176  *
4177  *	LOCKING:
4178  *	Kernel thread context (may sleep)
4179  */
ata_std_postreset(struct ata_link * link,unsigned int * classes)4180 void ata_std_postreset(struct ata_link *link, unsigned int *classes)
4181 {
4182 	u32 serror;
4183 
4184 	DPRINTK("ENTER\n");
4185 
4186 	/* reset complete, clear SError */
4187 	if (!sata_scr_read(link, SCR_ERROR, &serror))
4188 		sata_scr_write(link, SCR_ERROR, serror);
4189 
4190 	/* print link status */
4191 	sata_print_link_status(link);
4192 
4193 	DPRINTK("EXIT\n");
4194 }
4195 
4196 /**
4197  *	ata_dev_same_device - Determine whether new ID matches configured device
4198  *	@dev: device to compare against
4199  *	@new_class: class of the new device
4200  *	@new_id: IDENTIFY page of the new device
4201  *
4202  *	Compare @new_class and @new_id against @dev and determine
4203  *	whether @dev is the device indicated by @new_class and
4204  *	@new_id.
4205  *
4206  *	LOCKING:
4207  *	None.
4208  *
4209  *	RETURNS:
4210  *	1 if @dev matches @new_class and @new_id, 0 otherwise.
4211  */
ata_dev_same_device(struct ata_device * dev,unsigned int new_class,const u16 * new_id)4212 static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
4213 			       const u16 *new_id)
4214 {
4215 	const u16 *old_id = dev->id;
4216 	unsigned char model[2][ATA_ID_PROD_LEN + 1];
4217 	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
4218 
4219 	if (dev->class != new_class) {
4220 		ata_dev_info(dev, "class mismatch %d != %d\n",
4221 			     dev->class, new_class);
4222 		return 0;
4223 	}
4224 
4225 	ata_id_c_string(old_id, model[0], ATA_ID_PROD, sizeof(model[0]));
4226 	ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1]));
4227 	ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0]));
4228 	ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1]));
4229 
4230 	if (strcmp(model[0], model[1])) {
4231 		ata_dev_info(dev, "model number mismatch '%s' != '%s'\n",
4232 			     model[0], model[1]);
4233 		return 0;
4234 	}
4235 
4236 	if (strcmp(serial[0], serial[1])) {
4237 		ata_dev_info(dev, "serial number mismatch '%s' != '%s'\n",
4238 			     serial[0], serial[1]);
4239 		return 0;
4240 	}
4241 
4242 	return 1;
4243 }
4244 
4245 /**
4246  *	ata_dev_reread_id - Re-read IDENTIFY data
4247  *	@dev: target ATA device
4248  *	@readid_flags: read ID flags
4249  *
4250  *	Re-read IDENTIFY page and make sure @dev is still attached to
4251  *	the port.
4252  *
4253  *	LOCKING:
4254  *	Kernel thread context (may sleep)
4255  *
4256  *	RETURNS:
4257  *	0 on success, negative errno otherwise
4258  */
ata_dev_reread_id(struct ata_device * dev,unsigned int readid_flags)4259 int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
4260 {
4261 	unsigned int class = dev->class;
4262 	u16 *id = (void *)dev->link->ap->sector_buf;
4263 	int rc;
4264 
4265 	/* read ID data */
4266 	rc = ata_dev_read_id(dev, &class, readid_flags, id);
4267 	if (rc)
4268 		return rc;
4269 
4270 	/* is the device still there? */
4271 	if (!ata_dev_same_device(dev, class, id))
4272 		return -ENODEV;
4273 
4274 	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
4275 	return 0;
4276 }
4277 
4278 /**
4279  *	ata_dev_revalidate - Revalidate ATA device
4280  *	@dev: device to revalidate
4281  *	@new_class: new class code
4282  *	@readid_flags: read ID flags
4283  *
4284  *	Re-read IDENTIFY page, make sure @dev is still attached to the
4285  *	port and reconfigure it according to the new IDENTIFY page.
4286  *
4287  *	LOCKING:
4288  *	Kernel thread context (may sleep)
4289  *
4290  *	RETURNS:
4291  *	0 on success, negative errno otherwise
4292  */
ata_dev_revalidate(struct ata_device * dev,unsigned int new_class,unsigned int readid_flags)4293 int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
4294 		       unsigned int readid_flags)
4295 {
4296 	u64 n_sectors = dev->n_sectors;
4297 	u64 n_native_sectors = dev->n_native_sectors;
4298 	int rc;
4299 
4300 	if (!ata_dev_enabled(dev))
4301 		return -ENODEV;
4302 
4303 	/* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
4304 	if (ata_class_enabled(new_class) &&
4305 	    new_class != ATA_DEV_ATA &&
4306 	    new_class != ATA_DEV_ATAPI &&
4307 	    new_class != ATA_DEV_ZAC &&
4308 	    new_class != ATA_DEV_SEMB) {
4309 		ata_dev_info(dev, "class mismatch %u != %u\n",
4310 			     dev->class, new_class);
4311 		rc = -ENODEV;
4312 		goto fail;
4313 	}
4314 
4315 	/* re-read ID */
4316 	rc = ata_dev_reread_id(dev, readid_flags);
4317 	if (rc)
4318 		goto fail;
4319 
4320 	/* configure device according to the new ID */
4321 	rc = ata_dev_configure(dev);
4322 	if (rc)
4323 		goto fail;
4324 
4325 	/* verify n_sectors hasn't changed */
4326 	if (dev->class != ATA_DEV_ATA || !n_sectors ||
4327 	    dev->n_sectors == n_sectors)
4328 		return 0;
4329 
4330 	/* n_sectors has changed */
4331 	ata_dev_warn(dev, "n_sectors mismatch %llu != %llu\n",
4332 		     (unsigned long long)n_sectors,
4333 		     (unsigned long long)dev->n_sectors);
4334 
4335 	/*
4336 	 * Something could have caused HPA to be unlocked
4337 	 * involuntarily.  If n_native_sectors hasn't changed and the
4338 	 * new size matches it, keep the device.
4339 	 */
4340 	if (dev->n_native_sectors == n_native_sectors &&
4341 	    dev->n_sectors > n_sectors && dev->n_sectors == n_native_sectors) {
4342 		ata_dev_warn(dev,
4343 			     "new n_sectors matches native, probably "
4344 			     "late HPA unlock, n_sectors updated\n");
4345 		/* use the larger n_sectors */
4346 		return 0;
4347 	}
4348 
4349 	/*
4350 	 * Some BIOSes boot w/o HPA but resume w/ HPA locked.  Try
4351 	 * unlocking HPA in those cases.
4352 	 *
4353 	 * https://bugzilla.kernel.org/show_bug.cgi?id=15396
4354 	 */
4355 	if (dev->n_native_sectors == n_native_sectors &&
4356 	    dev->n_sectors < n_sectors && n_sectors == n_native_sectors &&
4357 	    !(dev->horkage & ATA_HORKAGE_BROKEN_HPA)) {
4358 		ata_dev_warn(dev,
4359 			     "old n_sectors matches native, probably "
4360 			     "late HPA lock, will try to unlock HPA\n");
4361 		/* try unlocking HPA */
4362 		dev->flags |= ATA_DFLAG_UNLOCK_HPA;
4363 		rc = -EIO;
4364 	} else
4365 		rc = -ENODEV;
4366 
4367 	/* restore original n_[native_]sectors and fail */
4368 	dev->n_native_sectors = n_native_sectors;
4369 	dev->n_sectors = n_sectors;
4370  fail:
4371 	ata_dev_err(dev, "revalidation failed (errno=%d)\n", rc);
4372 	return rc;
4373 }
4374 
4375 struct ata_blacklist_entry {
4376 	const char *model_num;
4377 	const char *model_rev;
4378 	unsigned long horkage;
4379 };
4380 
4381 static const struct ata_blacklist_entry ata_device_blacklist [] = {
4382 	/* Devices with DMA related problems under Linux */
4383 	{ "WDC AC11000H",	NULL,		ATA_HORKAGE_NODMA },
4384 	{ "WDC AC22100H",	NULL,		ATA_HORKAGE_NODMA },
4385 	{ "WDC AC32500H",	NULL,		ATA_HORKAGE_NODMA },
4386 	{ "WDC AC33100H",	NULL,		ATA_HORKAGE_NODMA },
4387 	{ "WDC AC31600H",	NULL,		ATA_HORKAGE_NODMA },
4388 	{ "WDC AC32100H",	"24.09P07",	ATA_HORKAGE_NODMA },
4389 	{ "WDC AC23200L",	"21.10N21",	ATA_HORKAGE_NODMA },
4390 	{ "Compaq CRD-8241B", 	NULL,		ATA_HORKAGE_NODMA },
4391 	{ "CRD-8400B",		NULL, 		ATA_HORKAGE_NODMA },
4392 	{ "CRD-848[02]B",	NULL,		ATA_HORKAGE_NODMA },
4393 	{ "CRD-84",		NULL,		ATA_HORKAGE_NODMA },
4394 	{ "SanDisk SDP3B",	NULL,		ATA_HORKAGE_NODMA },
4395 	{ "SanDisk SDP3B-64",	NULL,		ATA_HORKAGE_NODMA },
4396 	{ "SANYO CD-ROM CRD",	NULL,		ATA_HORKAGE_NODMA },
4397 	{ "HITACHI CDR-8",	NULL,		ATA_HORKAGE_NODMA },
4398 	{ "HITACHI CDR-8[34]35",NULL,		ATA_HORKAGE_NODMA },
4399 	{ "Toshiba CD-ROM XM-6202B", NULL,	ATA_HORKAGE_NODMA },
4400 	{ "TOSHIBA CD-ROM XM-1702BC", NULL,	ATA_HORKAGE_NODMA },
4401 	{ "CD-532E-A", 		NULL,		ATA_HORKAGE_NODMA },
4402 	{ "E-IDE CD-ROM CR-840",NULL,		ATA_HORKAGE_NODMA },
4403 	{ "CD-ROM Drive/F5A",	NULL,		ATA_HORKAGE_NODMA },
4404 	{ "WPI CDD-820", 	NULL,		ATA_HORKAGE_NODMA },
4405 	{ "SAMSUNG CD-ROM SC-148C", NULL,	ATA_HORKAGE_NODMA },
4406 	{ "SAMSUNG CD-ROM SC",	NULL,		ATA_HORKAGE_NODMA },
4407 	{ "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
4408 	{ "_NEC DV5800A", 	NULL,		ATA_HORKAGE_NODMA },
4409 	{ "SAMSUNG CD-ROM SN-124", "N001",	ATA_HORKAGE_NODMA },
4410 	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
4411 	{ " 2GB ATA Flash Disk", "ADMA428M",	ATA_HORKAGE_NODMA },
4412 	{ "VRFDFC22048UCHC-TE*", NULL,		ATA_HORKAGE_NODMA },
4413 	/* Odd clown on sil3726/4726 PMPs */
4414 	{ "Config  Disk",	NULL,		ATA_HORKAGE_DISABLE },
4415 
4416 	/* Weird ATAPI devices */
4417 	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
4418 	{ "QUANTUM DAT    DAT72-000", NULL,	ATA_HORKAGE_ATAPI_MOD16_DMA },
4419 	{ "Slimtype DVD A  DS8A8SH", NULL,	ATA_HORKAGE_MAX_SEC_LBA48 },
4420 	{ "Slimtype DVD A  DS8A9SH", NULL,	ATA_HORKAGE_MAX_SEC_LBA48 },
4421 
4422 	/*
4423 	 * Causes silent data corruption with higher max sects.
4424 	 * http://lkml.kernel.org/g/x49wpy40ysk.fsf@segfault.boston.devel.redhat.com
4425 	 */
4426 	{ "ST380013AS",		"3.20",		ATA_HORKAGE_MAX_SEC_1024 },
4427 
4428 	/*
4429 	 * These devices time out with higher max sects.
4430 	 * https://bugzilla.kernel.org/show_bug.cgi?id=121671
4431 	 */
4432 	{ "LITEON CX1-JB*-HP",	NULL,		ATA_HORKAGE_MAX_SEC_1024 },
4433 	{ "LITEON EP1-*",	NULL,		ATA_HORKAGE_MAX_SEC_1024 },
4434 
4435 	/* Devices we expect to fail diagnostics */
4436 
4437 	/* Devices where NCQ should be avoided */
4438 	/* NCQ is slow */
4439 	{ "WDC WD740ADFD-00",	NULL,		ATA_HORKAGE_NONCQ },
4440 	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ, },
4441 	/* http://thread.gmane.org/gmane.linux.ide/14907 */
4442 	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
4443 	/* NCQ is broken */
4444 	{ "Maxtor *",		"BANC*",	ATA_HORKAGE_NONCQ },
4445 	{ "Maxtor 7V300F0",	"VA111630",	ATA_HORKAGE_NONCQ },
4446 	{ "ST380817AS",		"3.42",		ATA_HORKAGE_NONCQ },
4447 	{ "ST3160023AS",	"3.42",		ATA_HORKAGE_NONCQ },
4448 	{ "OCZ CORE_SSD",	"02.10104",	ATA_HORKAGE_NONCQ },
4449 
4450 	/* Seagate NCQ + FLUSH CACHE firmware bug */
4451 	{ "ST31500341AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
4452 						ATA_HORKAGE_FIRMWARE_WARN },
4453 
4454 	{ "ST31000333AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
4455 						ATA_HORKAGE_FIRMWARE_WARN },
4456 
4457 	{ "ST3640[36]23AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
4458 						ATA_HORKAGE_FIRMWARE_WARN },
4459 
4460 	{ "ST3320[68]13AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
4461 						ATA_HORKAGE_FIRMWARE_WARN },
4462 
4463 	/* drives which fail FPDMA_AA activation (some may freeze afterwards)
4464 	   the ST disks also have LPM issues */
4465 	{ "ST1000LM024 HN-M101MBB", NULL,	ATA_HORKAGE_BROKEN_FPDMA_AA |
4466 						ATA_HORKAGE_NOLPM, },
4467 	{ "VB0250EAVER",	"HPG7",		ATA_HORKAGE_BROKEN_FPDMA_AA },
4468 
4469 	/* Blacklist entries taken from Silicon Image 3124/3132
4470 	   Windows driver .inf file - also several Linux problem reports */
4471 	{ "HTS541060G9SA00",    "MB3OC60D",     ATA_HORKAGE_NONCQ, },
4472 	{ "HTS541080G9SA00",    "MB4OC60D",     ATA_HORKAGE_NONCQ, },
4473 	{ "HTS541010G9SA00",    "MBZOC60D",     ATA_HORKAGE_NONCQ, },
4474 
4475 	/* https://bugzilla.kernel.org/show_bug.cgi?id=15573 */
4476 	{ "C300-CTFDDAC128MAG",	"0001",		ATA_HORKAGE_NONCQ, },
4477 
4478 	/* Some Sandisk SSDs lock up hard with NCQ enabled.  Reported on
4479 	   SD7SN6S256G and SD8SN8U256G */
4480 	{ "SanDisk SD[78]SN*G",	NULL,		ATA_HORKAGE_NONCQ, },
4481 
4482 	/* devices which puke on READ_NATIVE_MAX */
4483 	{ "HDS724040KLSA80",	"KFAOA20N",	ATA_HORKAGE_BROKEN_HPA, },
4484 	{ "WDC WD3200JD-00KLB0", "WD-WCAMR1130137", ATA_HORKAGE_BROKEN_HPA },
4485 	{ "WDC WD2500JD-00HBB0", "WD-WMAL71490727", ATA_HORKAGE_BROKEN_HPA },
4486 	{ "MAXTOR 6L080L4",	"A93.0500",	ATA_HORKAGE_BROKEN_HPA },
4487 
4488 	/* this one allows HPA unlocking but fails IOs on the area */
4489 	{ "OCZ-VERTEX",		    "1.30",	ATA_HORKAGE_BROKEN_HPA },
4490 
4491 	/* Devices which report 1 sector over size HPA */
4492 	{ "ST340823A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4493 	{ "ST320413A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4494 	{ "ST310211A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4495 
4496 	/* Devices which get the IVB wrong */
4497 	{ "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
4498 	/* Maybe we should just blacklist TSSTcorp... */
4499 	{ "TSSTcorp CDDVDW SH-S202[HJN]", "SB0[01]",  ATA_HORKAGE_IVB, },
4500 
4501 	/* Devices that do not need bridging limits applied */
4502 	{ "MTRON MSP-SATA*",		NULL,	ATA_HORKAGE_BRIDGE_OK, },
4503 	{ "BUFFALO HD-QSU2/R5",		NULL,	ATA_HORKAGE_BRIDGE_OK, },
4504 
4505 	/* Devices which aren't very happy with higher link speeds */
4506 	{ "WD My Book",			NULL,	ATA_HORKAGE_1_5_GBPS, },
4507 	{ "Seagate FreeAgent GoFlex",	NULL,	ATA_HORKAGE_1_5_GBPS, },
4508 
4509 	/*
4510 	 * Devices which choke on SETXFER.  Applies only if both the
4511 	 * device and controller are SATA.
4512 	 */
4513 	{ "PIONEER DVD-RW  DVRTD08",	NULL,	ATA_HORKAGE_NOSETXFER },
4514 	{ "PIONEER DVD-RW  DVRTD08A",	NULL,	ATA_HORKAGE_NOSETXFER },
4515 	{ "PIONEER DVD-RW  DVR-215",	NULL,	ATA_HORKAGE_NOSETXFER },
4516 	{ "PIONEER DVD-RW  DVR-212D",	NULL,	ATA_HORKAGE_NOSETXFER },
4517 	{ "PIONEER DVD-RW  DVR-216D",	NULL,	ATA_HORKAGE_NOSETXFER },
4518 
4519 	/* Crucial BX100 SSD 500GB has broken LPM support */
4520 	{ "CT500BX100SSD1",		NULL,	ATA_HORKAGE_NOLPM },
4521 
4522 	/* 512GB MX100 with MU01 firmware has both queued TRIM and LPM issues */
4523 	{ "Crucial_CT512MX100*",	"MU01",	ATA_HORKAGE_NO_NCQ_TRIM |
4524 						ATA_HORKAGE_ZERO_AFTER_TRIM |
4525 						ATA_HORKAGE_NOLPM, },
4526 	/* 512GB MX100 with newer firmware has only LPM issues */
4527 	{ "Crucial_CT512MX100*",	NULL,	ATA_HORKAGE_ZERO_AFTER_TRIM |
4528 						ATA_HORKAGE_NOLPM, },
4529 
4530 	/* 480GB+ M500 SSDs have both queued TRIM and LPM issues */
4531 	{ "Crucial_CT480M500*",		NULL,	ATA_HORKAGE_NO_NCQ_TRIM |
4532 						ATA_HORKAGE_ZERO_AFTER_TRIM |
4533 						ATA_HORKAGE_NOLPM, },
4534 	{ "Crucial_CT960M500*",		NULL,	ATA_HORKAGE_NO_NCQ_TRIM |
4535 						ATA_HORKAGE_ZERO_AFTER_TRIM |
4536 						ATA_HORKAGE_NOLPM, },
4537 
4538 	/* These specific Samsung models/firmware-revs do not handle LPM well */
4539 	{ "SAMSUNG MZMPC128HBFU-000MV", "CXM14M1Q", ATA_HORKAGE_NOLPM, },
4540 	{ "SAMSUNG SSD PM830 mSATA *",  "CXM13D1Q", ATA_HORKAGE_NOLPM, },
4541 	{ "SAMSUNG MZ7TD256HAFV-000L9", NULL,       ATA_HORKAGE_NOLPM, },
4542 	{ "SAMSUNG MZ7TE512HMHP-000L1", "EXT06L0Q", ATA_HORKAGE_NOLPM, },
4543 
4544 	/* devices that don't properly handle queued TRIM commands */
4545 	{ "Micron_M500IT_*",		"MU01",	ATA_HORKAGE_NO_NCQ_TRIM |
4546 						ATA_HORKAGE_ZERO_AFTER_TRIM, },
4547 	{ "Micron_M500_*",		NULL,	ATA_HORKAGE_NO_NCQ_TRIM |
4548 						ATA_HORKAGE_ZERO_AFTER_TRIM, },
4549 	{ "Crucial_CT*M500*",		NULL,	ATA_HORKAGE_NO_NCQ_TRIM |
4550 						ATA_HORKAGE_ZERO_AFTER_TRIM, },
4551 	{ "Micron_M5[15]0_*",		"MU01",	ATA_HORKAGE_NO_NCQ_TRIM |
4552 						ATA_HORKAGE_ZERO_AFTER_TRIM, },
4553 	{ "Crucial_CT*M550*",		"MU01",	ATA_HORKAGE_NO_NCQ_TRIM |
4554 						ATA_HORKAGE_ZERO_AFTER_TRIM, },
4555 	{ "Crucial_CT*MX100*",		"MU01",	ATA_HORKAGE_NO_NCQ_TRIM |
4556 						ATA_HORKAGE_ZERO_AFTER_TRIM, },
4557 	{ "Samsung SSD 840*",		NULL,	ATA_HORKAGE_NO_NCQ_TRIM |
4558 						ATA_HORKAGE_ZERO_AFTER_TRIM, },
4559 	{ "Samsung SSD 850*",		NULL,	ATA_HORKAGE_NO_NCQ_TRIM |
4560 						ATA_HORKAGE_ZERO_AFTER_TRIM, },
4561 	{ "FCCT*M500*",			NULL,	ATA_HORKAGE_NO_NCQ_TRIM |
4562 						ATA_HORKAGE_ZERO_AFTER_TRIM, },
4563 
4564 	/* devices that don't properly handle TRIM commands */
4565 	{ "SuperSSpeed S238*",		NULL,	ATA_HORKAGE_NOTRIM, },
4566 
4567 	/*
4568 	 * As defined, the DRAT (Deterministic Read After Trim) and RZAT
4569 	 * (Return Zero After Trim) flags in the ATA Command Set are
4570 	 * unreliable in the sense that they only define what happens if
4571 	 * the device successfully executed the DSM TRIM command. TRIM
4572 	 * is only advisory, however, and the device is free to silently
4573 	 * ignore all or parts of the request.
4574 	 *
4575 	 * Whitelist drives that are known to reliably return zeroes
4576 	 * after TRIM.
4577 	 */
4578 
4579 	/*
4580 	 * The intel 510 drive has buggy DRAT/RZAT. Explicitly exclude
4581 	 * that model before whitelisting all other intel SSDs.
4582 	 */
4583 	{ "INTEL*SSDSC2MH*",		NULL,	0, },
4584 
4585 	{ "Micron*",			NULL,	ATA_HORKAGE_ZERO_AFTER_TRIM, },
4586 	{ "Crucial*",			NULL,	ATA_HORKAGE_ZERO_AFTER_TRIM, },
4587 	{ "INTEL*SSD*", 		NULL,	ATA_HORKAGE_ZERO_AFTER_TRIM, },
4588 	{ "SSD*INTEL*",			NULL,	ATA_HORKAGE_ZERO_AFTER_TRIM, },
4589 	{ "Samsung*SSD*",		NULL,	ATA_HORKAGE_ZERO_AFTER_TRIM, },
4590 	{ "SAMSUNG*SSD*",		NULL,	ATA_HORKAGE_ZERO_AFTER_TRIM, },
4591 	{ "SAMSUNG*MZ7KM*",		NULL,	ATA_HORKAGE_ZERO_AFTER_TRIM, },
4592 	{ "ST[1248][0248]0[FH]*",	NULL,	ATA_HORKAGE_ZERO_AFTER_TRIM, },
4593 
4594 	/*
4595 	 * Some WD SATA-I drives spin up and down erratically when the link
4596 	 * is put into the slumber mode.  We don't have full list of the
4597 	 * affected devices.  Disable LPM if the device matches one of the
4598 	 * known prefixes and is SATA-1.  As a side effect LPM partial is
4599 	 * lost too.
4600 	 *
4601 	 * https://bugzilla.kernel.org/show_bug.cgi?id=57211
4602 	 */
4603 	{ "WDC WD800JD-*",		NULL,	ATA_HORKAGE_WD_BROKEN_LPM },
4604 	{ "WDC WD1200JD-*",		NULL,	ATA_HORKAGE_WD_BROKEN_LPM },
4605 	{ "WDC WD1600JD-*",		NULL,	ATA_HORKAGE_WD_BROKEN_LPM },
4606 	{ "WDC WD2000JD-*",		NULL,	ATA_HORKAGE_WD_BROKEN_LPM },
4607 	{ "WDC WD2500JD-*",		NULL,	ATA_HORKAGE_WD_BROKEN_LPM },
4608 	{ "WDC WD3000JD-*",		NULL,	ATA_HORKAGE_WD_BROKEN_LPM },
4609 	{ "WDC WD3200JD-*",		NULL,	ATA_HORKAGE_WD_BROKEN_LPM },
4610 
4611 	/* End Marker */
4612 	{ }
4613 };
4614 
ata_dev_blacklisted(const struct ata_device * dev)4615 static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
4616 {
4617 	unsigned char model_num[ATA_ID_PROD_LEN + 1];
4618 	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4619 	const struct ata_blacklist_entry *ad = ata_device_blacklist;
4620 
4621 	ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
4622 	ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
4623 
4624 	while (ad->model_num) {
4625 		if (glob_match(ad->model_num, model_num)) {
4626 			if (ad->model_rev == NULL)
4627 				return ad->horkage;
4628 			if (glob_match(ad->model_rev, model_rev))
4629 				return ad->horkage;
4630 		}
4631 		ad++;
4632 	}
4633 	return 0;
4634 }
4635 
ata_dma_blacklisted(const struct ata_device * dev)4636 static int ata_dma_blacklisted(const struct ata_device *dev)
4637 {
4638 	/* We don't support polling DMA.
4639 	 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
4640 	 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
4641 	 */
4642 	if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4643 	    (dev->flags & ATA_DFLAG_CDB_INTR))
4644 		return 1;
4645 	return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4646 }
4647 
4648 /**
4649  *	ata_is_40wire		-	check drive side detection
4650  *	@dev: device
4651  *
4652  *	Perform drive side detection decoding, allowing for device vendors
4653  *	who can't follow the documentation.
4654  */
4655 
ata_is_40wire(struct ata_device * dev)4656 static int ata_is_40wire(struct ata_device *dev)
4657 {
4658 	if (dev->horkage & ATA_HORKAGE_IVB)
4659 		return ata_drive_40wire_relaxed(dev->id);
4660 	return ata_drive_40wire(dev->id);
4661 }
4662 
4663 /**
4664  *	cable_is_40wire		-	40/80/SATA decider
4665  *	@ap: port to consider
4666  *
4667  *	This function encapsulates the policy for speed management
4668  *	in one place. At the moment we don't cache the result but
4669  *	there is a good case for setting ap->cbl to the result when
4670  *	we are called with unknown cables (and figuring out if it
4671  *	impacts hotplug at all).
4672  *
4673  *	Return 1 if the cable appears to be 40 wire.
4674  */
4675 
cable_is_40wire(struct ata_port * ap)4676 static int cable_is_40wire(struct ata_port *ap)
4677 {
4678 	struct ata_link *link;
4679 	struct ata_device *dev;
4680 
4681 	/* If the controller thinks we are 40 wire, we are. */
4682 	if (ap->cbl == ATA_CBL_PATA40)
4683 		return 1;
4684 
4685 	/* If the controller thinks we are 80 wire, we are. */
4686 	if (ap->cbl == ATA_CBL_PATA80 || ap->cbl == ATA_CBL_SATA)
4687 		return 0;
4688 
4689 	/* If the system is known to be 40 wire short cable (eg
4690 	 * laptop), then we allow 80 wire modes even if the drive
4691 	 * isn't sure.
4692 	 */
4693 	if (ap->cbl == ATA_CBL_PATA40_SHORT)
4694 		return 0;
4695 
4696 	/* If the controller doesn't know, we scan.
4697 	 *
4698 	 * Note: We look for all 40 wire detects at this point.  Any
4699 	 *       80 wire detect is taken to be 80 wire cable because
4700 	 * - in many setups only the one drive (slave if present) will
4701 	 *   give a valid detect
4702 	 * - if you have a non detect capable drive you don't want it
4703 	 *   to colour the choice
4704 	 */
4705 	ata_for_each_link(link, ap, EDGE) {
4706 		ata_for_each_dev(dev, link, ENABLED) {
4707 			if (!ata_is_40wire(dev))
4708 				return 0;
4709 		}
4710 	}
4711 	return 1;
4712 }
4713 
4714 /**
4715  *	ata_dev_xfermask - Compute supported xfermask of the given device
4716  *	@dev: Device to compute xfermask for
4717  *
4718  *	Compute supported xfermask of @dev and store it in
4719  *	dev->*_mask.  This function is responsible for applying all
4720  *	known limits including host controller limits, device
4721  *	blacklist, etc...
4722  *
4723  *	LOCKING:
4724  *	None.
4725  */
ata_dev_xfermask(struct ata_device * dev)4726 static void ata_dev_xfermask(struct ata_device *dev)
4727 {
4728 	struct ata_link *link = dev->link;
4729 	struct ata_port *ap = link->ap;
4730 	struct ata_host *host = ap->host;
4731 	unsigned long xfer_mask;
4732 
4733 	/* controller modes available */
4734 	xfer_mask = ata_pack_xfermask(ap->pio_mask,
4735 				      ap->mwdma_mask, ap->udma_mask);
4736 
4737 	/* drive modes available */
4738 	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
4739 				       dev->mwdma_mask, dev->udma_mask);
4740 	xfer_mask &= ata_id_xfermask(dev->id);
4741 
4742 	/*
4743 	 *	CFA Advanced TrueIDE timings are not allowed on a shared
4744 	 *	cable
4745 	 */
4746 	if (ata_dev_pair(dev)) {
4747 		/* No PIO5 or PIO6 */
4748 		xfer_mask &= ~(0x03 << (ATA_SHIFT_PIO + 5));
4749 		/* No MWDMA3 or MWDMA 4 */
4750 		xfer_mask &= ~(0x03 << (ATA_SHIFT_MWDMA + 3));
4751 	}
4752 
4753 	if (ata_dma_blacklisted(dev)) {
4754 		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4755 		ata_dev_warn(dev,
4756 			     "device is on DMA blacklist, disabling DMA\n");
4757 	}
4758 
4759 	if ((host->flags & ATA_HOST_SIMPLEX) &&
4760 	    host->simplex_claimed && host->simplex_claimed != ap) {
4761 		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4762 		ata_dev_warn(dev,
4763 			     "simplex DMA is claimed by other device, disabling DMA\n");
4764 	}
4765 
4766 	if (ap->flags & ATA_FLAG_NO_IORDY)
4767 		xfer_mask &= ata_pio_mask_no_iordy(dev);
4768 
4769 	if (ap->ops->mode_filter)
4770 		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4771 
4772 	/* Apply cable rule here.  Don't apply it early because when
4773 	 * we handle hot plug the cable type can itself change.
4774 	 * Check this last so that we know if the transfer rate was
4775 	 * solely limited by the cable.
4776 	 * Unknown or 80 wire cables reported host side are checked
4777 	 * drive side as well. Cases where we know a 40wire cable
4778 	 * is used safely for 80 are not checked here.
4779 	 */
4780 	if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
4781 		/* UDMA/44 or higher would be available */
4782 		if (cable_is_40wire(ap)) {
4783 			ata_dev_warn(dev,
4784 				     "limited to UDMA/33 due to 40-wire cable\n");
4785 			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
4786 		}
4787 
4788 	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
4789 			    &dev->mwdma_mask, &dev->udma_mask);
4790 }
4791 
4792 /**
4793  *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
4794  *	@dev: Device to which command will be sent
4795  *
4796  *	Issue SET FEATURES - XFER MODE command to device @dev
4797  *	on port @ap.
4798  *
4799  *	LOCKING:
4800  *	PCI/etc. bus probe sem.
4801  *
4802  *	RETURNS:
4803  *	0 on success, AC_ERR_* mask otherwise.
4804  */
4805 
ata_dev_set_xfermode(struct ata_device * dev)4806 static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
4807 {
4808 	struct ata_taskfile tf;
4809 	unsigned int err_mask;
4810 
4811 	/* set up set-features taskfile */
4812 	DPRINTK("set features - xfer mode\n");
4813 
4814 	/* Some controllers and ATAPI devices show flaky interrupt
4815 	 * behavior after setting xfer mode.  Use polling instead.
4816 	 */
4817 	ata_tf_init(dev, &tf);
4818 	tf.command = ATA_CMD_SET_FEATURES;
4819 	tf.feature = SETFEATURES_XFER;
4820 	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4821 	tf.protocol = ATA_PROT_NODATA;
4822 	/* If we are using IORDY we must send the mode setting command */
4823 	if (ata_pio_need_iordy(dev))
4824 		tf.nsect = dev->xfer_mode;
4825 	/* If the device has IORDY and the controller does not - turn it off */
4826  	else if (ata_id_has_iordy(dev->id))
4827 		tf.nsect = 0x01;
4828 	else /* In the ancient relic department - skip all of this */
4829 		return 0;
4830 
4831 	/* On some disks, this command causes spin-up, so we need longer timeout */
4832 	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 15000);
4833 
4834 	DPRINTK("EXIT, err_mask=%x\n", err_mask);
4835 	return err_mask;
4836 }
4837 
4838 /**
4839  *	ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4840  *	@dev: Device to which command will be sent
4841  *	@enable: Whether to enable or disable the feature
4842  *	@feature: The sector count represents the feature to set
4843  *
4844  *	Issue SET FEATURES - SATA FEATURES command to device @dev
4845  *	on port @ap with sector count
4846  *
4847  *	LOCKING:
4848  *	PCI/etc. bus probe sem.
4849  *
4850  *	RETURNS:
4851  *	0 on success, AC_ERR_* mask otherwise.
4852  */
ata_dev_set_feature(struct ata_device * dev,u8 enable,u8 feature)4853 unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable, u8 feature)
4854 {
4855 	struct ata_taskfile tf;
4856 	unsigned int err_mask;
4857 	unsigned long timeout = 0;
4858 
4859 	/* set up set-features taskfile */
4860 	DPRINTK("set features - SATA features\n");
4861 
4862 	ata_tf_init(dev, &tf);
4863 	tf.command = ATA_CMD_SET_FEATURES;
4864 	tf.feature = enable;
4865 	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4866 	tf.protocol = ATA_PROT_NODATA;
4867 	tf.nsect = feature;
4868 
4869 	if (enable == SETFEATURES_SPINUP)
4870 		timeout = ata_probe_timeout ?
4871 			  ata_probe_timeout * 1000 : SETFEATURES_SPINUP_TIMEOUT;
4872 	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, timeout);
4873 
4874 	DPRINTK("EXIT, err_mask=%x\n", err_mask);
4875 	return err_mask;
4876 }
4877 EXPORT_SYMBOL_GPL(ata_dev_set_feature);
4878 
4879 /**
4880  *	ata_dev_init_params - Issue INIT DEV PARAMS command
4881  *	@dev: Device to which command will be sent
4882  *	@heads: Number of heads (taskfile parameter)
4883  *	@sectors: Number of sectors (taskfile parameter)
4884  *
4885  *	LOCKING:
4886  *	Kernel thread context (may sleep)
4887  *
4888  *	RETURNS:
4889  *	0 on success, AC_ERR_* mask otherwise.
4890  */
ata_dev_init_params(struct ata_device * dev,u16 heads,u16 sectors)4891 static unsigned int ata_dev_init_params(struct ata_device *dev,
4892 					u16 heads, u16 sectors)
4893 {
4894 	struct ata_taskfile tf;
4895 	unsigned int err_mask;
4896 
4897 	/* Number of sectors per track 1-255. Number of heads 1-16 */
4898 	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4899 		return AC_ERR_INVALID;
4900 
4901 	/* set up init dev params taskfile */
4902 	DPRINTK("init dev params \n");
4903 
4904 	ata_tf_init(dev, &tf);
4905 	tf.command = ATA_CMD_INIT_DEV_PARAMS;
4906 	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4907 	tf.protocol = ATA_PROT_NODATA;
4908 	tf.nsect = sectors;
4909 	tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
4910 
4911 	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4912 	/* A clean abort indicates an original or just out of spec drive
4913 	   and we should continue as we issue the setup based on the
4914 	   drive reported working geometry */
4915 	if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
4916 		err_mask = 0;
4917 
4918 	DPRINTK("EXIT, err_mask=%x\n", err_mask);
4919 	return err_mask;
4920 }
4921 
4922 /**
4923  *	atapi_check_dma - Check whether ATAPI DMA can be supported
4924  *	@qc: Metadata associated with taskfile to check
4925  *
4926  *	Allow low-level driver to filter ATA PACKET commands, returning
4927  *	a status indicating whether or not it is OK to use DMA for the
4928  *	supplied PACKET command.
4929  *
4930  *	LOCKING:
4931  *	spin_lock_irqsave(host lock)
4932  *
4933  *	RETURNS: 0 when ATAPI DMA can be used
4934  *               nonzero otherwise
4935  */
atapi_check_dma(struct ata_queued_cmd * qc)4936 int atapi_check_dma(struct ata_queued_cmd *qc)
4937 {
4938 	struct ata_port *ap = qc->ap;
4939 
4940 	/* Don't allow DMA if it isn't multiple of 16 bytes.  Quite a
4941 	 * few ATAPI devices choke on such DMA requests.
4942 	 */
4943 	if (!(qc->dev->horkage & ATA_HORKAGE_ATAPI_MOD16_DMA) &&
4944 	    unlikely(qc->nbytes & 15))
4945 		return 1;
4946 
4947 	if (ap->ops->check_atapi_dma)
4948 		return ap->ops->check_atapi_dma(qc);
4949 
4950 	return 0;
4951 }
4952 
4953 /**
4954  *	ata_std_qc_defer - Check whether a qc needs to be deferred
4955  *	@qc: ATA command in question
4956  *
4957  *	Non-NCQ commands cannot run with any other command, NCQ or
4958  *	not.  As upper layer only knows the queue depth, we are
4959  *	responsible for maintaining exclusion.  This function checks
4960  *	whether a new command @qc can be issued.
4961  *
4962  *	LOCKING:
4963  *	spin_lock_irqsave(host lock)
4964  *
4965  *	RETURNS:
4966  *	ATA_DEFER_* if deferring is needed, 0 otherwise.
4967  */
ata_std_qc_defer(struct ata_queued_cmd * qc)4968 int ata_std_qc_defer(struct ata_queued_cmd *qc)
4969 {
4970 	struct ata_link *link = qc->dev->link;
4971 
4972 	if (ata_is_ncq(qc->tf.protocol)) {
4973 		if (!ata_tag_valid(link->active_tag))
4974 			return 0;
4975 	} else {
4976 		if (!ata_tag_valid(link->active_tag) && !link->sactive)
4977 			return 0;
4978 	}
4979 
4980 	return ATA_DEFER_LINK;
4981 }
4982 
ata_noop_qc_prep(struct ata_queued_cmd * qc)4983 void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
4984 
4985 /**
4986  *	ata_sg_init - Associate command with scatter-gather table.
4987  *	@qc: Command to be associated
4988  *	@sg: Scatter-gather table.
4989  *	@n_elem: Number of elements in s/g table.
4990  *
4991  *	Initialize the data-related elements of queued_cmd @qc
4992  *	to point to a scatter-gather table @sg, containing @n_elem
4993  *	elements.
4994  *
4995  *	LOCKING:
4996  *	spin_lock_irqsave(host lock)
4997  */
ata_sg_init(struct ata_queued_cmd * qc,struct scatterlist * sg,unsigned int n_elem)4998 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
4999 		 unsigned int n_elem)
5000 {
5001 	qc->sg = sg;
5002 	qc->n_elem = n_elem;
5003 	qc->cursg = qc->sg;
5004 }
5005 
5006 #ifdef CONFIG_HAS_DMA
5007 
5008 /**
5009  *	ata_sg_clean - Unmap DMA memory associated with command
5010  *	@qc: Command containing DMA memory to be released
5011  *
5012  *	Unmap all mapped DMA memory associated with this command.
5013  *
5014  *	LOCKING:
5015  *	spin_lock_irqsave(host lock)
5016  */
ata_sg_clean(struct ata_queued_cmd * qc)5017 static void ata_sg_clean(struct ata_queued_cmd *qc)
5018 {
5019 	struct ata_port *ap = qc->ap;
5020 	struct scatterlist *sg = qc->sg;
5021 	int dir = qc->dma_dir;
5022 
5023 	WARN_ON_ONCE(sg == NULL);
5024 
5025 	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
5026 
5027 	if (qc->n_elem)
5028 		dma_unmap_sg(ap->dev, sg, qc->orig_n_elem, dir);
5029 
5030 	qc->flags &= ~ATA_QCFLAG_DMAMAP;
5031 	qc->sg = NULL;
5032 }
5033 
5034 /**
5035  *	ata_sg_setup - DMA-map the scatter-gather table associated with a command.
5036  *	@qc: Command with scatter-gather table to be mapped.
5037  *
5038  *	DMA-map the scatter-gather table associated with queued_cmd @qc.
5039  *
5040  *	LOCKING:
5041  *	spin_lock_irqsave(host lock)
5042  *
5043  *	RETURNS:
5044  *	Zero on success, negative on error.
5045  *
5046  */
ata_sg_setup(struct ata_queued_cmd * qc)5047 static int ata_sg_setup(struct ata_queued_cmd *qc)
5048 {
5049 	struct ata_port *ap = qc->ap;
5050 	unsigned int n_elem;
5051 
5052 	VPRINTK("ENTER, ata%u\n", ap->print_id);
5053 
5054 	n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir);
5055 	if (n_elem < 1)
5056 		return -1;
5057 
5058 	VPRINTK("%d sg elements mapped\n", n_elem);
5059 	qc->orig_n_elem = qc->n_elem;
5060 	qc->n_elem = n_elem;
5061 	qc->flags |= ATA_QCFLAG_DMAMAP;
5062 
5063 	return 0;
5064 }
5065 
5066 #else /* !CONFIG_HAS_DMA */
5067 
ata_sg_clean(struct ata_queued_cmd * qc)5068 static inline void ata_sg_clean(struct ata_queued_cmd *qc) {}
ata_sg_setup(struct ata_queued_cmd * qc)5069 static inline int ata_sg_setup(struct ata_queued_cmd *qc) { return -1; }
5070 
5071 #endif /* !CONFIG_HAS_DMA */
5072 
5073 /**
5074  *	swap_buf_le16 - swap halves of 16-bit words in place
5075  *	@buf:  Buffer to swap
5076  *	@buf_words:  Number of 16-bit words in buffer.
5077  *
5078  *	Swap halves of 16-bit words if needed to convert from
5079  *	little-endian byte order to native cpu byte order, or
5080  *	vice-versa.
5081  *
5082  *	LOCKING:
5083  *	Inherited from caller.
5084  */
swap_buf_le16(u16 * buf,unsigned int buf_words)5085 void swap_buf_le16(u16 *buf, unsigned int buf_words)
5086 {
5087 #ifdef __BIG_ENDIAN
5088 	unsigned int i;
5089 
5090 	for (i = 0; i < buf_words; i++)
5091 		buf[i] = le16_to_cpu(buf[i]);
5092 #endif /* __BIG_ENDIAN */
5093 }
5094 
5095 /**
5096  *	ata_qc_new_init - Request an available ATA command, and initialize it
5097  *	@dev: Device from whom we request an available command structure
5098  *	@tag: tag
5099  *
5100  *	LOCKING:
5101  *	None.
5102  */
5103 
ata_qc_new_init(struct ata_device * dev,int tag)5104 struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev, int tag)
5105 {
5106 	struct ata_port *ap = dev->link->ap;
5107 	struct ata_queued_cmd *qc;
5108 
5109 	/* no command while frozen */
5110 	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
5111 		return NULL;
5112 
5113 	/* libsas case */
5114 	if (ap->flags & ATA_FLAG_SAS_HOST) {
5115 		tag = ata_sas_allocate_tag(ap);
5116 		if (tag < 0)
5117 			return NULL;
5118 	}
5119 
5120 	qc = __ata_qc_from_tag(ap, tag);
5121 	qc->tag = qc->hw_tag = tag;
5122 	qc->scsicmd = NULL;
5123 	qc->ap = ap;
5124 	qc->dev = dev;
5125 
5126 	ata_qc_reinit(qc);
5127 
5128 	return qc;
5129 }
5130 
5131 /**
5132  *	ata_qc_free - free unused ata_queued_cmd
5133  *	@qc: Command to complete
5134  *
5135  *	Designed to free unused ata_queued_cmd object
5136  *	in case something prevents using it.
5137  *
5138  *	LOCKING:
5139  *	spin_lock_irqsave(host lock)
5140  */
ata_qc_free(struct ata_queued_cmd * qc)5141 void ata_qc_free(struct ata_queued_cmd *qc)
5142 {
5143 	struct ata_port *ap;
5144 	unsigned int tag;
5145 
5146 	WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
5147 	ap = qc->ap;
5148 
5149 	qc->flags = 0;
5150 	tag = qc->tag;
5151 	if (ata_tag_valid(tag)) {
5152 		qc->tag = ATA_TAG_POISON;
5153 		if (ap->flags & ATA_FLAG_SAS_HOST)
5154 			ata_sas_free_tag(tag, ap);
5155 	}
5156 }
5157 
__ata_qc_complete(struct ata_queued_cmd * qc)5158 void __ata_qc_complete(struct ata_queued_cmd *qc)
5159 {
5160 	struct ata_port *ap;
5161 	struct ata_link *link;
5162 
5163 	WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
5164 	WARN_ON_ONCE(!(qc->flags & ATA_QCFLAG_ACTIVE));
5165 	ap = qc->ap;
5166 	link = qc->dev->link;
5167 
5168 	if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
5169 		ata_sg_clean(qc);
5170 
5171 	/* command should be marked inactive atomically with qc completion */
5172 	if (ata_is_ncq(qc->tf.protocol)) {
5173 		link->sactive &= ~(1 << qc->hw_tag);
5174 		if (!link->sactive)
5175 			ap->nr_active_links--;
5176 	} else {
5177 		link->active_tag = ATA_TAG_POISON;
5178 		ap->nr_active_links--;
5179 	}
5180 
5181 	/* clear exclusive status */
5182 	if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
5183 		     ap->excl_link == link))
5184 		ap->excl_link = NULL;
5185 
5186 	/* atapi: mark qc as inactive to prevent the interrupt handler
5187 	 * from completing the command twice later, before the error handler
5188 	 * is called. (when rc != 0 and atapi request sense is needed)
5189 	 */
5190 	qc->flags &= ~ATA_QCFLAG_ACTIVE;
5191 	ap->qc_active &= ~(1ULL << qc->tag);
5192 
5193 	/* call completion callback */
5194 	qc->complete_fn(qc);
5195 }
5196 
fill_result_tf(struct ata_queued_cmd * qc)5197 static void fill_result_tf(struct ata_queued_cmd *qc)
5198 {
5199 	struct ata_port *ap = qc->ap;
5200 
5201 	qc->result_tf.flags = qc->tf.flags;
5202 	ap->ops->qc_fill_rtf(qc);
5203 }
5204 
ata_verify_xfer(struct ata_queued_cmd * qc)5205 static void ata_verify_xfer(struct ata_queued_cmd *qc)
5206 {
5207 	struct ata_device *dev = qc->dev;
5208 
5209 	if (!ata_is_data(qc->tf.protocol))
5210 		return;
5211 
5212 	if ((dev->mwdma_mask || dev->udma_mask) && ata_is_pio(qc->tf.protocol))
5213 		return;
5214 
5215 	dev->flags &= ~ATA_DFLAG_DUBIOUS_XFER;
5216 }
5217 
5218 /**
5219  *	ata_qc_complete - Complete an active ATA command
5220  *	@qc: Command to complete
5221  *
5222  *	Indicate to the mid and upper layers that an ATA command has
5223  *	completed, with either an ok or not-ok status.
5224  *
5225  *	Refrain from calling this function multiple times when
5226  *	successfully completing multiple NCQ commands.
5227  *	ata_qc_complete_multiple() should be used instead, which will
5228  *	properly update IRQ expect state.
5229  *
5230  *	LOCKING:
5231  *	spin_lock_irqsave(host lock)
5232  */
ata_qc_complete(struct ata_queued_cmd * qc)5233 void ata_qc_complete(struct ata_queued_cmd *qc)
5234 {
5235 	struct ata_port *ap = qc->ap;
5236 
5237 	/* Trigger the LED (if available) */
5238 	ledtrig_disk_activity(!!(qc->tf.flags & ATA_TFLAG_WRITE));
5239 
5240 	/* XXX: New EH and old EH use different mechanisms to
5241 	 * synchronize EH with regular execution path.
5242 	 *
5243 	 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
5244 	 * Normal execution path is responsible for not accessing a
5245 	 * failed qc.  libata core enforces the rule by returning NULL
5246 	 * from ata_qc_from_tag() for failed qcs.
5247 	 *
5248 	 * Old EH depends on ata_qc_complete() nullifying completion
5249 	 * requests if ATA_QCFLAG_EH_SCHEDULED is set.  Old EH does
5250 	 * not synchronize with interrupt handler.  Only PIO task is
5251 	 * taken care of.
5252 	 */
5253 	if (ap->ops->error_handler) {
5254 		struct ata_device *dev = qc->dev;
5255 		struct ata_eh_info *ehi = &dev->link->eh_info;
5256 
5257 		if (unlikely(qc->err_mask))
5258 			qc->flags |= ATA_QCFLAG_FAILED;
5259 
5260 		/*
5261 		 * Finish internal commands without any further processing
5262 		 * and always with the result TF filled.
5263 		 */
5264 		if (unlikely(ata_tag_internal(qc->tag))) {
5265 			fill_result_tf(qc);
5266 			trace_ata_qc_complete_internal(qc);
5267 			__ata_qc_complete(qc);
5268 			return;
5269 		}
5270 
5271 		/*
5272 		 * Non-internal qc has failed.  Fill the result TF and
5273 		 * summon EH.
5274 		 */
5275 		if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
5276 			fill_result_tf(qc);
5277 			trace_ata_qc_complete_failed(qc);
5278 			ata_qc_schedule_eh(qc);
5279 			return;
5280 		}
5281 
5282 		WARN_ON_ONCE(ap->pflags & ATA_PFLAG_FROZEN);
5283 
5284 		/* read result TF if requested */
5285 		if (qc->flags & ATA_QCFLAG_RESULT_TF)
5286 			fill_result_tf(qc);
5287 
5288 		trace_ata_qc_complete_done(qc);
5289 		/* Some commands need post-processing after successful
5290 		 * completion.
5291 		 */
5292 		switch (qc->tf.command) {
5293 		case ATA_CMD_SET_FEATURES:
5294 			if (qc->tf.feature != SETFEATURES_WC_ON &&
5295 			    qc->tf.feature != SETFEATURES_WC_OFF &&
5296 			    qc->tf.feature != SETFEATURES_RA_ON &&
5297 			    qc->tf.feature != SETFEATURES_RA_OFF)
5298 				break;
5299 			/* fall through */
5300 		case ATA_CMD_INIT_DEV_PARAMS: /* CHS translation changed */
5301 		case ATA_CMD_SET_MULTI: /* multi_count changed */
5302 			/* revalidate device */
5303 			ehi->dev_action[dev->devno] |= ATA_EH_REVALIDATE;
5304 			ata_port_schedule_eh(ap);
5305 			break;
5306 
5307 		case ATA_CMD_SLEEP:
5308 			dev->flags |= ATA_DFLAG_SLEEPING;
5309 			break;
5310 		}
5311 
5312 		if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
5313 			ata_verify_xfer(qc);
5314 
5315 		__ata_qc_complete(qc);
5316 	} else {
5317 		if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
5318 			return;
5319 
5320 		/* read result TF if failed or requested */
5321 		if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
5322 			fill_result_tf(qc);
5323 
5324 		__ata_qc_complete(qc);
5325 	}
5326 }
5327 
5328 /**
5329  *	ata_qc_get_active - get bitmask of active qcs
5330  *	@ap: port in question
5331  *
5332  *	LOCKING:
5333  *	spin_lock_irqsave(host lock)
5334  *
5335  *	RETURNS:
5336  *	Bitmask of active qcs
5337  */
ata_qc_get_active(struct ata_port * ap)5338 u64 ata_qc_get_active(struct ata_port *ap)
5339 {
5340 	u64 qc_active = ap->qc_active;
5341 
5342 	/* ATA_TAG_INTERNAL is sent to hw as tag 0 */
5343 	if (qc_active & (1ULL << ATA_TAG_INTERNAL)) {
5344 		qc_active |= (1 << 0);
5345 		qc_active &= ~(1ULL << ATA_TAG_INTERNAL);
5346 	}
5347 
5348 	return qc_active;
5349 }
5350 EXPORT_SYMBOL_GPL(ata_qc_get_active);
5351 
5352 /**
5353  *	ata_qc_complete_multiple - Complete multiple qcs successfully
5354  *	@ap: port in question
5355  *	@qc_active: new qc_active mask
5356  *
5357  *	Complete in-flight commands.  This functions is meant to be
5358  *	called from low-level driver's interrupt routine to complete
5359  *	requests normally.  ap->qc_active and @qc_active is compared
5360  *	and commands are completed accordingly.
5361  *
5362  *	Always use this function when completing multiple NCQ commands
5363  *	from IRQ handlers instead of calling ata_qc_complete()
5364  *	multiple times to keep IRQ expect status properly in sync.
5365  *
5366  *	LOCKING:
5367  *	spin_lock_irqsave(host lock)
5368  *
5369  *	RETURNS:
5370  *	Number of completed commands on success, -errno otherwise.
5371  */
ata_qc_complete_multiple(struct ata_port * ap,u64 qc_active)5372 int ata_qc_complete_multiple(struct ata_port *ap, u64 qc_active)
5373 {
5374 	u64 done_mask, ap_qc_active = ap->qc_active;
5375 	int nr_done = 0;
5376 
5377 	/*
5378 	 * If the internal tag is set on ap->qc_active, then we care about
5379 	 * bit0 on the passed in qc_active mask. Move that bit up to match
5380 	 * the internal tag.
5381 	 */
5382 	if (ap_qc_active & (1ULL << ATA_TAG_INTERNAL)) {
5383 		qc_active |= (qc_active & 0x01) << ATA_TAG_INTERNAL;
5384 		qc_active ^= qc_active & 0x01;
5385 	}
5386 
5387 	done_mask = ap_qc_active ^ qc_active;
5388 
5389 	if (unlikely(done_mask & qc_active)) {
5390 		ata_port_err(ap, "illegal qc_active transition (%08llx->%08llx)\n",
5391 			     ap->qc_active, qc_active);
5392 		return -EINVAL;
5393 	}
5394 
5395 	while (done_mask) {
5396 		struct ata_queued_cmd *qc;
5397 		unsigned int tag = __ffs64(done_mask);
5398 
5399 		qc = ata_qc_from_tag(ap, tag);
5400 		if (qc) {
5401 			ata_qc_complete(qc);
5402 			nr_done++;
5403 		}
5404 		done_mask &= ~(1ULL << tag);
5405 	}
5406 
5407 	return nr_done;
5408 }
5409 
5410 /**
5411  *	ata_qc_issue - issue taskfile to device
5412  *	@qc: command to issue to device
5413  *
5414  *	Prepare an ATA command to submission to device.
5415  *	This includes mapping the data into a DMA-able
5416  *	area, filling in the S/G table, and finally
5417  *	writing the taskfile to hardware, starting the command.
5418  *
5419  *	LOCKING:
5420  *	spin_lock_irqsave(host lock)
5421  */
ata_qc_issue(struct ata_queued_cmd * qc)5422 void ata_qc_issue(struct ata_queued_cmd *qc)
5423 {
5424 	struct ata_port *ap = qc->ap;
5425 	struct ata_link *link = qc->dev->link;
5426 	u8 prot = qc->tf.protocol;
5427 
5428 	/* Make sure only one non-NCQ command is outstanding.  The
5429 	 * check is skipped for old EH because it reuses active qc to
5430 	 * request ATAPI sense.
5431 	 */
5432 	WARN_ON_ONCE(ap->ops->error_handler && ata_tag_valid(link->active_tag));
5433 
5434 	if (ata_is_ncq(prot)) {
5435 		WARN_ON_ONCE(link->sactive & (1 << qc->hw_tag));
5436 
5437 		if (!link->sactive)
5438 			ap->nr_active_links++;
5439 		link->sactive |= 1 << qc->hw_tag;
5440 	} else {
5441 		WARN_ON_ONCE(link->sactive);
5442 
5443 		ap->nr_active_links++;
5444 		link->active_tag = qc->tag;
5445 	}
5446 
5447 	qc->flags |= ATA_QCFLAG_ACTIVE;
5448 	ap->qc_active |= 1ULL << qc->tag;
5449 
5450 	/*
5451 	 * We guarantee to LLDs that they will have at least one
5452 	 * non-zero sg if the command is a data command.
5453 	 */
5454 	if (ata_is_data(prot) && (!qc->sg || !qc->n_elem || !qc->nbytes))
5455 		goto sys_err;
5456 
5457 	if (ata_is_dma(prot) || (ata_is_pio(prot) &&
5458 				 (ap->flags & ATA_FLAG_PIO_DMA)))
5459 		if (ata_sg_setup(qc))
5460 			goto sys_err;
5461 
5462 	/* if device is sleeping, schedule reset and abort the link */
5463 	if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
5464 		link->eh_info.action |= ATA_EH_RESET;
5465 		ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
5466 		ata_link_abort(link);
5467 		return;
5468 	}
5469 
5470 	ap->ops->qc_prep(qc);
5471 	trace_ata_qc_issue(qc);
5472 	qc->err_mask |= ap->ops->qc_issue(qc);
5473 	if (unlikely(qc->err_mask))
5474 		goto err;
5475 	return;
5476 
5477 sys_err:
5478 	qc->err_mask |= AC_ERR_SYSTEM;
5479 err:
5480 	ata_qc_complete(qc);
5481 }
5482 
5483 /**
5484  *	sata_scr_valid - test whether SCRs are accessible
5485  *	@link: ATA link to test SCR accessibility for
5486  *
5487  *	Test whether SCRs are accessible for @link.
5488  *
5489  *	LOCKING:
5490  *	None.
5491  *
5492  *	RETURNS:
5493  *	1 if SCRs are accessible, 0 otherwise.
5494  */
sata_scr_valid(struct ata_link * link)5495 int sata_scr_valid(struct ata_link *link)
5496 {
5497 	struct ata_port *ap = link->ap;
5498 
5499 	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
5500 }
5501 
5502 /**
5503  *	sata_scr_read - read SCR register of the specified port
5504  *	@link: ATA link to read SCR for
5505  *	@reg: SCR to read
5506  *	@val: Place to store read value
5507  *
5508  *	Read SCR register @reg of @link into *@val.  This function is
5509  *	guaranteed to succeed if @link is ap->link, the cable type of
5510  *	the port is SATA and the port implements ->scr_read.
5511  *
5512  *	LOCKING:
5513  *	None if @link is ap->link.  Kernel thread context otherwise.
5514  *
5515  *	RETURNS:
5516  *	0 on success, negative errno on failure.
5517  */
sata_scr_read(struct ata_link * link,int reg,u32 * val)5518 int sata_scr_read(struct ata_link *link, int reg, u32 *val)
5519 {
5520 	if (ata_is_host_link(link)) {
5521 		if (sata_scr_valid(link))
5522 			return link->ap->ops->scr_read(link, reg, val);
5523 		return -EOPNOTSUPP;
5524 	}
5525 
5526 	return sata_pmp_scr_read(link, reg, val);
5527 }
5528 
5529 /**
5530  *	sata_scr_write - write SCR register of the specified port
5531  *	@link: ATA link to write SCR for
5532  *	@reg: SCR to write
5533  *	@val: value to write
5534  *
5535  *	Write @val to SCR register @reg of @link.  This function is
5536  *	guaranteed to succeed if @link is ap->link, the cable type of
5537  *	the port is SATA and the port implements ->scr_read.
5538  *
5539  *	LOCKING:
5540  *	None if @link is ap->link.  Kernel thread context otherwise.
5541  *
5542  *	RETURNS:
5543  *	0 on success, negative errno on failure.
5544  */
sata_scr_write(struct ata_link * link,int reg,u32 val)5545 int sata_scr_write(struct ata_link *link, int reg, u32 val)
5546 {
5547 	if (ata_is_host_link(link)) {
5548 		if (sata_scr_valid(link))
5549 			return link->ap->ops->scr_write(link, reg, val);
5550 		return -EOPNOTSUPP;
5551 	}
5552 
5553 	return sata_pmp_scr_write(link, reg, val);
5554 }
5555 
5556 /**
5557  *	sata_scr_write_flush - write SCR register of the specified port and flush
5558  *	@link: ATA link to write SCR for
5559  *	@reg: SCR to write
5560  *	@val: value to write
5561  *
5562  *	This function is identical to sata_scr_write() except that this
5563  *	function performs flush after writing to the register.
5564  *
5565  *	LOCKING:
5566  *	None if @link is ap->link.  Kernel thread context otherwise.
5567  *
5568  *	RETURNS:
5569  *	0 on success, negative errno on failure.
5570  */
sata_scr_write_flush(struct ata_link * link,int reg,u32 val)5571 int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
5572 {
5573 	if (ata_is_host_link(link)) {
5574 		int rc;
5575 
5576 		if (sata_scr_valid(link)) {
5577 			rc = link->ap->ops->scr_write(link, reg, val);
5578 			if (rc == 0)
5579 				rc = link->ap->ops->scr_read(link, reg, &val);
5580 			return rc;
5581 		}
5582 		return -EOPNOTSUPP;
5583 	}
5584 
5585 	return sata_pmp_scr_write(link, reg, val);
5586 }
5587 
5588 /**
5589  *	ata_phys_link_online - test whether the given link is online
5590  *	@link: ATA link to test
5591  *
5592  *	Test whether @link is online.  Note that this function returns
5593  *	0 if online status of @link cannot be obtained, so
5594  *	ata_link_online(link) != !ata_link_offline(link).
5595  *
5596  *	LOCKING:
5597  *	None.
5598  *
5599  *	RETURNS:
5600  *	True if the port online status is available and online.
5601  */
ata_phys_link_online(struct ata_link * link)5602 bool ata_phys_link_online(struct ata_link *link)
5603 {
5604 	u32 sstatus;
5605 
5606 	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5607 	    ata_sstatus_online(sstatus))
5608 		return true;
5609 	return false;
5610 }
5611 
5612 /**
5613  *	ata_phys_link_offline - test whether the given link is offline
5614  *	@link: ATA link to test
5615  *
5616  *	Test whether @link is offline.  Note that this function
5617  *	returns 0 if offline status of @link cannot be obtained, so
5618  *	ata_link_online(link) != !ata_link_offline(link).
5619  *
5620  *	LOCKING:
5621  *	None.
5622  *
5623  *	RETURNS:
5624  *	True if the port offline status is available and offline.
5625  */
ata_phys_link_offline(struct ata_link * link)5626 bool ata_phys_link_offline(struct ata_link *link)
5627 {
5628 	u32 sstatus;
5629 
5630 	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5631 	    !ata_sstatus_online(sstatus))
5632 		return true;
5633 	return false;
5634 }
5635 
5636 /**
5637  *	ata_link_online - test whether the given link is online
5638  *	@link: ATA link to test
5639  *
5640  *	Test whether @link is online.  This is identical to
5641  *	ata_phys_link_online() when there's no slave link.  When
5642  *	there's a slave link, this function should only be called on
5643  *	the master link and will return true if any of M/S links is
5644  *	online.
5645  *
5646  *	LOCKING:
5647  *	None.
5648  *
5649  *	RETURNS:
5650  *	True if the port online status is available and online.
5651  */
ata_link_online(struct ata_link * link)5652 bool ata_link_online(struct ata_link *link)
5653 {
5654 	struct ata_link *slave = link->ap->slave_link;
5655 
5656 	WARN_ON(link == slave);	/* shouldn't be called on slave link */
5657 
5658 	return ata_phys_link_online(link) ||
5659 		(slave && ata_phys_link_online(slave));
5660 }
5661 
5662 /**
5663  *	ata_link_offline - test whether the given link is offline
5664  *	@link: ATA link to test
5665  *
5666  *	Test whether @link is offline.  This is identical to
5667  *	ata_phys_link_offline() when there's no slave link.  When
5668  *	there's a slave link, this function should only be called on
5669  *	the master link and will return true if both M/S links are
5670  *	offline.
5671  *
5672  *	LOCKING:
5673  *	None.
5674  *
5675  *	RETURNS:
5676  *	True if the port offline status is available and offline.
5677  */
ata_link_offline(struct ata_link * link)5678 bool ata_link_offline(struct ata_link *link)
5679 {
5680 	struct ata_link *slave = link->ap->slave_link;
5681 
5682 	WARN_ON(link == slave);	/* shouldn't be called on slave link */
5683 
5684 	return ata_phys_link_offline(link) &&
5685 		(!slave || ata_phys_link_offline(slave));
5686 }
5687 
5688 #ifdef CONFIG_PM
ata_port_request_pm(struct ata_port * ap,pm_message_t mesg,unsigned int action,unsigned int ehi_flags,bool async)5689 static void ata_port_request_pm(struct ata_port *ap, pm_message_t mesg,
5690 				unsigned int action, unsigned int ehi_flags,
5691 				bool async)
5692 {
5693 	struct ata_link *link;
5694 	unsigned long flags;
5695 
5696 	/* Previous resume operation might still be in
5697 	 * progress.  Wait for PM_PENDING to clear.
5698 	 */
5699 	if (ap->pflags & ATA_PFLAG_PM_PENDING) {
5700 		ata_port_wait_eh(ap);
5701 		WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
5702 	}
5703 
5704 	/* request PM ops to EH */
5705 	spin_lock_irqsave(ap->lock, flags);
5706 
5707 	ap->pm_mesg = mesg;
5708 	ap->pflags |= ATA_PFLAG_PM_PENDING;
5709 	ata_for_each_link(link, ap, HOST_FIRST) {
5710 		link->eh_info.action |= action;
5711 		link->eh_info.flags |= ehi_flags;
5712 	}
5713 
5714 	ata_port_schedule_eh(ap);
5715 
5716 	spin_unlock_irqrestore(ap->lock, flags);
5717 
5718 	if (!async) {
5719 		ata_port_wait_eh(ap);
5720 		WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
5721 	}
5722 }
5723 
5724 /*
5725  * On some hardware, device fails to respond after spun down for suspend.  As
5726  * the device won't be used before being resumed, we don't need to touch the
5727  * device.  Ask EH to skip the usual stuff and proceed directly to suspend.
5728  *
5729  * http://thread.gmane.org/gmane.linux.ide/46764
5730  */
5731 static const unsigned int ata_port_suspend_ehi = ATA_EHI_QUIET
5732 						 | ATA_EHI_NO_AUTOPSY
5733 						 | ATA_EHI_NO_RECOVERY;
5734 
ata_port_suspend(struct ata_port * ap,pm_message_t mesg)5735 static void ata_port_suspend(struct ata_port *ap, pm_message_t mesg)
5736 {
5737 	ata_port_request_pm(ap, mesg, 0, ata_port_suspend_ehi, false);
5738 }
5739 
ata_port_suspend_async(struct ata_port * ap,pm_message_t mesg)5740 static void ata_port_suspend_async(struct ata_port *ap, pm_message_t mesg)
5741 {
5742 	ata_port_request_pm(ap, mesg, 0, ata_port_suspend_ehi, true);
5743 }
5744 
ata_port_pm_suspend(struct device * dev)5745 static int ata_port_pm_suspend(struct device *dev)
5746 {
5747 	struct ata_port *ap = to_ata_port(dev);
5748 
5749 	if (pm_runtime_suspended(dev))
5750 		return 0;
5751 
5752 	ata_port_suspend(ap, PMSG_SUSPEND);
5753 	return 0;
5754 }
5755 
ata_port_pm_freeze(struct device * dev)5756 static int ata_port_pm_freeze(struct device *dev)
5757 {
5758 	struct ata_port *ap = to_ata_port(dev);
5759 
5760 	if (pm_runtime_suspended(dev))
5761 		return 0;
5762 
5763 	ata_port_suspend(ap, PMSG_FREEZE);
5764 	return 0;
5765 }
5766 
ata_port_pm_poweroff(struct device * dev)5767 static int ata_port_pm_poweroff(struct device *dev)
5768 {
5769 	ata_port_suspend(to_ata_port(dev), PMSG_HIBERNATE);
5770 	return 0;
5771 }
5772 
5773 static const unsigned int ata_port_resume_ehi = ATA_EHI_NO_AUTOPSY
5774 						| ATA_EHI_QUIET;
5775 
ata_port_resume(struct ata_port * ap,pm_message_t mesg)5776 static void ata_port_resume(struct ata_port *ap, pm_message_t mesg)
5777 {
5778 	ata_port_request_pm(ap, mesg, ATA_EH_RESET, ata_port_resume_ehi, false);
5779 }
5780 
ata_port_resume_async(struct ata_port * ap,pm_message_t mesg)5781 static void ata_port_resume_async(struct ata_port *ap, pm_message_t mesg)
5782 {
5783 	ata_port_request_pm(ap, mesg, ATA_EH_RESET, ata_port_resume_ehi, true);
5784 }
5785 
ata_port_pm_resume(struct device * dev)5786 static int ata_port_pm_resume(struct device *dev)
5787 {
5788 	ata_port_resume_async(to_ata_port(dev), PMSG_RESUME);
5789 	pm_runtime_disable(dev);
5790 	pm_runtime_set_active(dev);
5791 	pm_runtime_enable(dev);
5792 	return 0;
5793 }
5794 
5795 /*
5796  * For ODDs, the upper layer will poll for media change every few seconds,
5797  * which will make it enter and leave suspend state every few seconds. And
5798  * as each suspend will cause a hard/soft reset, the gain of runtime suspend
5799  * is very little and the ODD may malfunction after constantly being reset.
5800  * So the idle callback here will not proceed to suspend if a non-ZPODD capable
5801  * ODD is attached to the port.
5802  */
ata_port_runtime_idle(struct device * dev)5803 static int ata_port_runtime_idle(struct device *dev)
5804 {
5805 	struct ata_port *ap = to_ata_port(dev);
5806 	struct ata_link *link;
5807 	struct ata_device *adev;
5808 
5809 	ata_for_each_link(link, ap, HOST_FIRST) {
5810 		ata_for_each_dev(adev, link, ENABLED)
5811 			if (adev->class == ATA_DEV_ATAPI &&
5812 			    !zpodd_dev_enabled(adev))
5813 				return -EBUSY;
5814 	}
5815 
5816 	return 0;
5817 }
5818 
ata_port_runtime_suspend(struct device * dev)5819 static int ata_port_runtime_suspend(struct device *dev)
5820 {
5821 	ata_port_suspend(to_ata_port(dev), PMSG_AUTO_SUSPEND);
5822 	return 0;
5823 }
5824 
ata_port_runtime_resume(struct device * dev)5825 static int ata_port_runtime_resume(struct device *dev)
5826 {
5827 	ata_port_resume(to_ata_port(dev), PMSG_AUTO_RESUME);
5828 	return 0;
5829 }
5830 
5831 static const struct dev_pm_ops ata_port_pm_ops = {
5832 	.suspend = ata_port_pm_suspend,
5833 	.resume = ata_port_pm_resume,
5834 	.freeze = ata_port_pm_freeze,
5835 	.thaw = ata_port_pm_resume,
5836 	.poweroff = ata_port_pm_poweroff,
5837 	.restore = ata_port_pm_resume,
5838 
5839 	.runtime_suspend = ata_port_runtime_suspend,
5840 	.runtime_resume = ata_port_runtime_resume,
5841 	.runtime_idle = ata_port_runtime_idle,
5842 };
5843 
5844 /* sas ports don't participate in pm runtime management of ata_ports,
5845  * and need to resume ata devices at the domain level, not the per-port
5846  * level. sas suspend/resume is async to allow parallel port recovery
5847  * since sas has multiple ata_port instances per Scsi_Host.
5848  */
ata_sas_port_suspend(struct ata_port * ap)5849 void ata_sas_port_suspend(struct ata_port *ap)
5850 {
5851 	ata_port_suspend_async(ap, PMSG_SUSPEND);
5852 }
5853 EXPORT_SYMBOL_GPL(ata_sas_port_suspend);
5854 
ata_sas_port_resume(struct ata_port * ap)5855 void ata_sas_port_resume(struct ata_port *ap)
5856 {
5857 	ata_port_resume_async(ap, PMSG_RESUME);
5858 }
5859 EXPORT_SYMBOL_GPL(ata_sas_port_resume);
5860 
5861 /**
5862  *	ata_host_suspend - suspend host
5863  *	@host: host to suspend
5864  *	@mesg: PM message
5865  *
5866  *	Suspend @host.  Actual operation is performed by port suspend.
5867  */
ata_host_suspend(struct ata_host * host,pm_message_t mesg)5868 int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5869 {
5870 	host->dev->power.power_state = mesg;
5871 	return 0;
5872 }
5873 
5874 /**
5875  *	ata_host_resume - resume host
5876  *	@host: host to resume
5877  *
5878  *	Resume @host.  Actual operation is performed by port resume.
5879  */
ata_host_resume(struct ata_host * host)5880 void ata_host_resume(struct ata_host *host)
5881 {
5882 	host->dev->power.power_state = PMSG_ON;
5883 }
5884 #endif
5885 
5886 const struct device_type ata_port_type = {
5887 	.name = "ata_port",
5888 #ifdef CONFIG_PM
5889 	.pm = &ata_port_pm_ops,
5890 #endif
5891 };
5892 
5893 /**
5894  *	ata_dev_init - Initialize an ata_device structure
5895  *	@dev: Device structure to initialize
5896  *
5897  *	Initialize @dev in preparation for probing.
5898  *
5899  *	LOCKING:
5900  *	Inherited from caller.
5901  */
ata_dev_init(struct ata_device * dev)5902 void ata_dev_init(struct ata_device *dev)
5903 {
5904 	struct ata_link *link = ata_dev_phys_link(dev);
5905 	struct ata_port *ap = link->ap;
5906 	unsigned long flags;
5907 
5908 	/* SATA spd limit is bound to the attached device, reset together */
5909 	link->sata_spd_limit = link->hw_sata_spd_limit;
5910 	link->sata_spd = 0;
5911 
5912 	/* High bits of dev->flags are used to record warm plug
5913 	 * requests which occur asynchronously.  Synchronize using
5914 	 * host lock.
5915 	 */
5916 	spin_lock_irqsave(ap->lock, flags);
5917 	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5918 	dev->horkage = 0;
5919 	spin_unlock_irqrestore(ap->lock, flags);
5920 
5921 	memset((void *)dev + ATA_DEVICE_CLEAR_BEGIN, 0,
5922 	       ATA_DEVICE_CLEAR_END - ATA_DEVICE_CLEAR_BEGIN);
5923 	dev->pio_mask = UINT_MAX;
5924 	dev->mwdma_mask = UINT_MAX;
5925 	dev->udma_mask = UINT_MAX;
5926 }
5927 
5928 /**
5929  *	ata_link_init - Initialize an ata_link structure
5930  *	@ap: ATA port link is attached to
5931  *	@link: Link structure to initialize
5932  *	@pmp: Port multiplier port number
5933  *
5934  *	Initialize @link.
5935  *
5936  *	LOCKING:
5937  *	Kernel thread context (may sleep)
5938  */
ata_link_init(struct ata_port * ap,struct ata_link * link,int pmp)5939 void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
5940 {
5941 	int i;
5942 
5943 	/* clear everything except for devices */
5944 	memset((void *)link + ATA_LINK_CLEAR_BEGIN, 0,
5945 	       ATA_LINK_CLEAR_END - ATA_LINK_CLEAR_BEGIN);
5946 
5947 	link->ap = ap;
5948 	link->pmp = pmp;
5949 	link->active_tag = ATA_TAG_POISON;
5950 	link->hw_sata_spd_limit = UINT_MAX;
5951 
5952 	/* can't use iterator, ap isn't initialized yet */
5953 	for (i = 0; i < ATA_MAX_DEVICES; i++) {
5954 		struct ata_device *dev = &link->device[i];
5955 
5956 		dev->link = link;
5957 		dev->devno = dev - link->device;
5958 #ifdef CONFIG_ATA_ACPI
5959 		dev->gtf_filter = ata_acpi_gtf_filter;
5960 #endif
5961 		ata_dev_init(dev);
5962 	}
5963 }
5964 
5965 /**
5966  *	sata_link_init_spd - Initialize link->sata_spd_limit
5967  *	@link: Link to configure sata_spd_limit for
5968  *
5969  *	Initialize @link->[hw_]sata_spd_limit to the currently
5970  *	configured value.
5971  *
5972  *	LOCKING:
5973  *	Kernel thread context (may sleep).
5974  *
5975  *	RETURNS:
5976  *	0 on success, -errno on failure.
5977  */
sata_link_init_spd(struct ata_link * link)5978 int sata_link_init_spd(struct ata_link *link)
5979 {
5980 	u8 spd;
5981 	int rc;
5982 
5983 	rc = sata_scr_read(link, SCR_CONTROL, &link->saved_scontrol);
5984 	if (rc)
5985 		return rc;
5986 
5987 	spd = (link->saved_scontrol >> 4) & 0xf;
5988 	if (spd)
5989 		link->hw_sata_spd_limit &= (1 << spd) - 1;
5990 
5991 	ata_force_link_limits(link);
5992 
5993 	link->sata_spd_limit = link->hw_sata_spd_limit;
5994 
5995 	return 0;
5996 }
5997 
5998 /**
5999  *	ata_port_alloc - allocate and initialize basic ATA port resources
6000  *	@host: ATA host this allocated port belongs to
6001  *
6002  *	Allocate and initialize basic ATA port resources.
6003  *
6004  *	RETURNS:
6005  *	Allocate ATA port on success, NULL on failure.
6006  *
6007  *	LOCKING:
6008  *	Inherited from calling layer (may sleep).
6009  */
ata_port_alloc(struct ata_host * host)6010 struct ata_port *ata_port_alloc(struct ata_host *host)
6011 {
6012 	struct ata_port *ap;
6013 
6014 	DPRINTK("ENTER\n");
6015 
6016 	ap = kzalloc(sizeof(*ap), GFP_KERNEL);
6017 	if (!ap)
6018 		return NULL;
6019 
6020 	ap->pflags |= ATA_PFLAG_INITIALIZING | ATA_PFLAG_FROZEN;
6021 	ap->lock = &host->lock;
6022 	ap->print_id = -1;
6023 	ap->local_port_no = -1;
6024 	ap->host = host;
6025 	ap->dev = host->dev;
6026 
6027 #if defined(ATA_VERBOSE_DEBUG)
6028 	/* turn on all debugging levels */
6029 	ap->msg_enable = 0x00FF;
6030 #elif defined(ATA_DEBUG)
6031 	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_INFO | ATA_MSG_CTL | ATA_MSG_WARN | ATA_MSG_ERR;
6032 #else
6033 	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
6034 #endif
6035 
6036 	mutex_init(&ap->scsi_scan_mutex);
6037 	INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
6038 	INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
6039 	INIT_LIST_HEAD(&ap->eh_done_q);
6040 	init_waitqueue_head(&ap->eh_wait_q);
6041 	init_completion(&ap->park_req_pending);
6042 	timer_setup(&ap->fastdrain_timer, ata_eh_fastdrain_timerfn,
6043 		    TIMER_DEFERRABLE);
6044 
6045 	ap->cbl = ATA_CBL_NONE;
6046 
6047 	ata_link_init(ap, &ap->link, 0);
6048 
6049 #ifdef ATA_IRQ_TRAP
6050 	ap->stats.unhandled_irq = 1;
6051 	ap->stats.idle_irq = 1;
6052 #endif
6053 	ata_sff_port_init(ap);
6054 
6055 	return ap;
6056 }
6057 
ata_devres_release(struct device * gendev,void * res)6058 static void ata_devres_release(struct device *gendev, void *res)
6059 {
6060 	struct ata_host *host = dev_get_drvdata(gendev);
6061 	int i;
6062 
6063 	for (i = 0; i < host->n_ports; i++) {
6064 		struct ata_port *ap = host->ports[i];
6065 
6066 		if (!ap)
6067 			continue;
6068 
6069 		if (ap->scsi_host)
6070 			scsi_host_put(ap->scsi_host);
6071 
6072 	}
6073 
6074 	dev_set_drvdata(gendev, NULL);
6075 	ata_host_put(host);
6076 }
6077 
ata_host_release(struct kref * kref)6078 static void ata_host_release(struct kref *kref)
6079 {
6080 	struct ata_host *host = container_of(kref, struct ata_host, kref);
6081 	int i;
6082 
6083 	for (i = 0; i < host->n_ports; i++) {
6084 		struct ata_port *ap = host->ports[i];
6085 
6086 		kfree(ap->pmp_link);
6087 		kfree(ap->slave_link);
6088 		kfree(ap);
6089 		host->ports[i] = NULL;
6090 	}
6091 	kfree(host);
6092 }
6093 
ata_host_get(struct ata_host * host)6094 void ata_host_get(struct ata_host *host)
6095 {
6096 	kref_get(&host->kref);
6097 }
6098 
ata_host_put(struct ata_host * host)6099 void ata_host_put(struct ata_host *host)
6100 {
6101 	kref_put(&host->kref, ata_host_release);
6102 }
6103 
6104 /**
6105  *	ata_host_alloc - allocate and init basic ATA host resources
6106  *	@dev: generic device this host is associated with
6107  *	@max_ports: maximum number of ATA ports associated with this host
6108  *
6109  *	Allocate and initialize basic ATA host resources.  LLD calls
6110  *	this function to allocate a host, initializes it fully and
6111  *	attaches it using ata_host_register().
6112  *
6113  *	@max_ports ports are allocated and host->n_ports is
6114  *	initialized to @max_ports.  The caller is allowed to decrease
6115  *	host->n_ports before calling ata_host_register().  The unused
6116  *	ports will be automatically freed on registration.
6117  *
6118  *	RETURNS:
6119  *	Allocate ATA host on success, NULL on failure.
6120  *
6121  *	LOCKING:
6122  *	Inherited from calling layer (may sleep).
6123  */
ata_host_alloc(struct device * dev,int max_ports)6124 struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
6125 {
6126 	struct ata_host *host;
6127 	size_t sz;
6128 	int i;
6129 	void *dr;
6130 
6131 	DPRINTK("ENTER\n");
6132 
6133 	/* alloc a container for our list of ATA ports (buses) */
6134 	sz = sizeof(struct ata_host) + (max_ports + 1) * sizeof(void *);
6135 	host = kzalloc(sz, GFP_KERNEL);
6136 	if (!host)
6137 		return NULL;
6138 
6139 	if (!devres_open_group(dev, NULL, GFP_KERNEL))
6140 		goto err_free;
6141 
6142 	dr = devres_alloc(ata_devres_release, 0, GFP_KERNEL);
6143 	if (!dr)
6144 		goto err_out;
6145 
6146 	devres_add(dev, dr);
6147 	dev_set_drvdata(dev, host);
6148 
6149 	spin_lock_init(&host->lock);
6150 	mutex_init(&host->eh_mutex);
6151 	host->dev = dev;
6152 	host->n_ports = max_ports;
6153 	kref_init(&host->kref);
6154 
6155 	/* allocate ports bound to this host */
6156 	for (i = 0; i < max_ports; i++) {
6157 		struct ata_port *ap;
6158 
6159 		ap = ata_port_alloc(host);
6160 		if (!ap)
6161 			goto err_out;
6162 
6163 		ap->port_no = i;
6164 		host->ports[i] = ap;
6165 	}
6166 
6167 	devres_remove_group(dev, NULL);
6168 	return host;
6169 
6170  err_out:
6171 	devres_release_group(dev, NULL);
6172  err_free:
6173 	kfree(host);
6174 	return NULL;
6175 }
6176 
6177 /**
6178  *	ata_host_alloc_pinfo - alloc host and init with port_info array
6179  *	@dev: generic device this host is associated with
6180  *	@ppi: array of ATA port_info to initialize host with
6181  *	@n_ports: number of ATA ports attached to this host
6182  *
6183  *	Allocate ATA host and initialize with info from @ppi.  If NULL
6184  *	terminated, @ppi may contain fewer entries than @n_ports.  The
6185  *	last entry will be used for the remaining ports.
6186  *
6187  *	RETURNS:
6188  *	Allocate ATA host on success, NULL on failure.
6189  *
6190  *	LOCKING:
6191  *	Inherited from calling layer (may sleep).
6192  */
ata_host_alloc_pinfo(struct device * dev,const struct ata_port_info * const * ppi,int n_ports)6193 struct ata_host *ata_host_alloc_pinfo(struct device *dev,
6194 				      const struct ata_port_info * const * ppi,
6195 				      int n_ports)
6196 {
6197 	const struct ata_port_info *pi;
6198 	struct ata_host *host;
6199 	int i, j;
6200 
6201 	host = ata_host_alloc(dev, n_ports);
6202 	if (!host)
6203 		return NULL;
6204 
6205 	for (i = 0, j = 0, pi = NULL; i < host->n_ports; i++) {
6206 		struct ata_port *ap = host->ports[i];
6207 
6208 		if (ppi[j])
6209 			pi = ppi[j++];
6210 
6211 		ap->pio_mask = pi->pio_mask;
6212 		ap->mwdma_mask = pi->mwdma_mask;
6213 		ap->udma_mask = pi->udma_mask;
6214 		ap->flags |= pi->flags;
6215 		ap->link.flags |= pi->link_flags;
6216 		ap->ops = pi->port_ops;
6217 
6218 		if (!host->ops && (pi->port_ops != &ata_dummy_port_ops))
6219 			host->ops = pi->port_ops;
6220 	}
6221 
6222 	return host;
6223 }
6224 
6225 /**
6226  *	ata_slave_link_init - initialize slave link
6227  *	@ap: port to initialize slave link for
6228  *
6229  *	Create and initialize slave link for @ap.  This enables slave
6230  *	link handling on the port.
6231  *
6232  *	In libata, a port contains links and a link contains devices.
6233  *	There is single host link but if a PMP is attached to it,
6234  *	there can be multiple fan-out links.  On SATA, there's usually
6235  *	a single device connected to a link but PATA and SATA
6236  *	controllers emulating TF based interface can have two - master
6237  *	and slave.
6238  *
6239  *	However, there are a few controllers which don't fit into this
6240  *	abstraction too well - SATA controllers which emulate TF
6241  *	interface with both master and slave devices but also have
6242  *	separate SCR register sets for each device.  These controllers
6243  *	need separate links for physical link handling
6244  *	(e.g. onlineness, link speed) but should be treated like a
6245  *	traditional M/S controller for everything else (e.g. command
6246  *	issue, softreset).
6247  *
6248  *	slave_link is libata's way of handling this class of
6249  *	controllers without impacting core layer too much.  For
6250  *	anything other than physical link handling, the default host
6251  *	link is used for both master and slave.  For physical link
6252  *	handling, separate @ap->slave_link is used.  All dirty details
6253  *	are implemented inside libata core layer.  From LLD's POV, the
6254  *	only difference is that prereset, hardreset and postreset are
6255  *	called once more for the slave link, so the reset sequence
6256  *	looks like the following.
6257  *
6258  *	prereset(M) -> prereset(S) -> hardreset(M) -> hardreset(S) ->
6259  *	softreset(M) -> postreset(M) -> postreset(S)
6260  *
6261  *	Note that softreset is called only for the master.  Softreset
6262  *	resets both M/S by definition, so SRST on master should handle
6263  *	both (the standard method will work just fine).
6264  *
6265  *	LOCKING:
6266  *	Should be called before host is registered.
6267  *
6268  *	RETURNS:
6269  *	0 on success, -errno on failure.
6270  */
ata_slave_link_init(struct ata_port * ap)6271 int ata_slave_link_init(struct ata_port *ap)
6272 {
6273 	struct ata_link *link;
6274 
6275 	WARN_ON(ap->slave_link);
6276 	WARN_ON(ap->flags & ATA_FLAG_PMP);
6277 
6278 	link = kzalloc(sizeof(*link), GFP_KERNEL);
6279 	if (!link)
6280 		return -ENOMEM;
6281 
6282 	ata_link_init(ap, link, 1);
6283 	ap->slave_link = link;
6284 	return 0;
6285 }
6286 
ata_host_stop(struct device * gendev,void * res)6287 static void ata_host_stop(struct device *gendev, void *res)
6288 {
6289 	struct ata_host *host = dev_get_drvdata(gendev);
6290 	int i;
6291 
6292 	WARN_ON(!(host->flags & ATA_HOST_STARTED));
6293 
6294 	for (i = 0; i < host->n_ports; i++) {
6295 		struct ata_port *ap = host->ports[i];
6296 
6297 		if (ap->ops->port_stop)
6298 			ap->ops->port_stop(ap);
6299 	}
6300 
6301 	if (host->ops->host_stop)
6302 		host->ops->host_stop(host);
6303 }
6304 
6305 /**
6306  *	ata_finalize_port_ops - finalize ata_port_operations
6307  *	@ops: ata_port_operations to finalize
6308  *
6309  *	An ata_port_operations can inherit from another ops and that
6310  *	ops can again inherit from another.  This can go on as many
6311  *	times as necessary as long as there is no loop in the
6312  *	inheritance chain.
6313  *
6314  *	Ops tables are finalized when the host is started.  NULL or
6315  *	unspecified entries are inherited from the closet ancestor
6316  *	which has the method and the entry is populated with it.
6317  *	After finalization, the ops table directly points to all the
6318  *	methods and ->inherits is no longer necessary and cleared.
6319  *
6320  *	Using ATA_OP_NULL, inheriting ops can force a method to NULL.
6321  *
6322  *	LOCKING:
6323  *	None.
6324  */
ata_finalize_port_ops(struct ata_port_operations * ops)6325 static void ata_finalize_port_ops(struct ata_port_operations *ops)
6326 {
6327 	static DEFINE_SPINLOCK(lock);
6328 	const struct ata_port_operations *cur;
6329 	void **begin = (void **)ops;
6330 	void **end = (void **)&ops->inherits;
6331 	void **pp;
6332 
6333 	if (!ops || !ops->inherits)
6334 		return;
6335 
6336 	spin_lock(&lock);
6337 
6338 	for (cur = ops->inherits; cur; cur = cur->inherits) {
6339 		void **inherit = (void **)cur;
6340 
6341 		for (pp = begin; pp < end; pp++, inherit++)
6342 			if (!*pp)
6343 				*pp = *inherit;
6344 	}
6345 
6346 	for (pp = begin; pp < end; pp++)
6347 		if (IS_ERR(*pp))
6348 			*pp = NULL;
6349 
6350 	ops->inherits = NULL;
6351 
6352 	spin_unlock(&lock);
6353 }
6354 
6355 /**
6356  *	ata_host_start - start and freeze ports of an ATA host
6357  *	@host: ATA host to start ports for
6358  *
6359  *	Start and then freeze ports of @host.  Started status is
6360  *	recorded in host->flags, so this function can be called
6361  *	multiple times.  Ports are guaranteed to get started only
6362  *	once.  If host->ops isn't initialized yet, its set to the
6363  *	first non-dummy port ops.
6364  *
6365  *	LOCKING:
6366  *	Inherited from calling layer (may sleep).
6367  *
6368  *	RETURNS:
6369  *	0 if all ports are started successfully, -errno otherwise.
6370  */
ata_host_start(struct ata_host * host)6371 int ata_host_start(struct ata_host *host)
6372 {
6373 	int have_stop = 0;
6374 	void *start_dr = NULL;
6375 	int i, rc;
6376 
6377 	if (host->flags & ATA_HOST_STARTED)
6378 		return 0;
6379 
6380 	ata_finalize_port_ops(host->ops);
6381 
6382 	for (i = 0; i < host->n_ports; i++) {
6383 		struct ata_port *ap = host->ports[i];
6384 
6385 		ata_finalize_port_ops(ap->ops);
6386 
6387 		if (!host->ops && !ata_port_is_dummy(ap))
6388 			host->ops = ap->ops;
6389 
6390 		if (ap->ops->port_stop)
6391 			have_stop = 1;
6392 	}
6393 
6394 	if (host->ops->host_stop)
6395 		have_stop = 1;
6396 
6397 	if (have_stop) {
6398 		start_dr = devres_alloc(ata_host_stop, 0, GFP_KERNEL);
6399 		if (!start_dr)
6400 			return -ENOMEM;
6401 	}
6402 
6403 	for (i = 0; i < host->n_ports; i++) {
6404 		struct ata_port *ap = host->ports[i];
6405 
6406 		if (ap->ops->port_start) {
6407 			rc = ap->ops->port_start(ap);
6408 			if (rc) {
6409 				if (rc != -ENODEV)
6410 					dev_err(host->dev,
6411 						"failed to start port %d (errno=%d)\n",
6412 						i, rc);
6413 				goto err_out;
6414 			}
6415 		}
6416 		ata_eh_freeze_port(ap);
6417 	}
6418 
6419 	if (start_dr)
6420 		devres_add(host->dev, start_dr);
6421 	host->flags |= ATA_HOST_STARTED;
6422 	return 0;
6423 
6424  err_out:
6425 	while (--i >= 0) {
6426 		struct ata_port *ap = host->ports[i];
6427 
6428 		if (ap->ops->port_stop)
6429 			ap->ops->port_stop(ap);
6430 	}
6431 	devres_free(start_dr);
6432 	return rc;
6433 }
6434 
6435 /**
6436  *	ata_sas_host_init - Initialize a host struct for sas (ipr, libsas)
6437  *	@host:	host to initialize
6438  *	@dev:	device host is attached to
6439  *	@ops:	port_ops
6440  *
6441  */
ata_host_init(struct ata_host * host,struct device * dev,struct ata_port_operations * ops)6442 void ata_host_init(struct ata_host *host, struct device *dev,
6443 		   struct ata_port_operations *ops)
6444 {
6445 	spin_lock_init(&host->lock);
6446 	mutex_init(&host->eh_mutex);
6447 	host->n_tags = ATA_MAX_QUEUE;
6448 	host->dev = dev;
6449 	host->ops = ops;
6450 	kref_init(&host->kref);
6451 }
6452 
__ata_port_probe(struct ata_port * ap)6453 void __ata_port_probe(struct ata_port *ap)
6454 {
6455 	struct ata_eh_info *ehi = &ap->link.eh_info;
6456 	unsigned long flags;
6457 
6458 	/* kick EH for boot probing */
6459 	spin_lock_irqsave(ap->lock, flags);
6460 
6461 	ehi->probe_mask |= ATA_ALL_DEVICES;
6462 	ehi->action |= ATA_EH_RESET;
6463 	ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
6464 
6465 	ap->pflags &= ~ATA_PFLAG_INITIALIZING;
6466 	ap->pflags |= ATA_PFLAG_LOADING;
6467 	ata_port_schedule_eh(ap);
6468 
6469 	spin_unlock_irqrestore(ap->lock, flags);
6470 }
6471 
ata_port_probe(struct ata_port * ap)6472 int ata_port_probe(struct ata_port *ap)
6473 {
6474 	int rc = 0;
6475 
6476 	if (ap->ops->error_handler) {
6477 		__ata_port_probe(ap);
6478 		ata_port_wait_eh(ap);
6479 	} else {
6480 		DPRINTK("ata%u: bus probe begin\n", ap->print_id);
6481 		rc = ata_bus_probe(ap);
6482 		DPRINTK("ata%u: bus probe end\n", ap->print_id);
6483 	}
6484 	return rc;
6485 }
6486 
6487 
async_port_probe(void * data,async_cookie_t cookie)6488 static void async_port_probe(void *data, async_cookie_t cookie)
6489 {
6490 	struct ata_port *ap = data;
6491 
6492 	/*
6493 	 * If we're not allowed to scan this host in parallel,
6494 	 * we need to wait until all previous scans have completed
6495 	 * before going further.
6496 	 * Jeff Garzik says this is only within a controller, so we
6497 	 * don't need to wait for port 0, only for later ports.
6498 	 */
6499 	if (!(ap->host->flags & ATA_HOST_PARALLEL_SCAN) && ap->port_no != 0)
6500 		async_synchronize_cookie(cookie);
6501 
6502 	(void)ata_port_probe(ap);
6503 
6504 	/* in order to keep device order, we need to synchronize at this point */
6505 	async_synchronize_cookie(cookie);
6506 
6507 	ata_scsi_scan_host(ap, 1);
6508 }
6509 
6510 /**
6511  *	ata_host_register - register initialized ATA host
6512  *	@host: ATA host to register
6513  *	@sht: template for SCSI host
6514  *
6515  *	Register initialized ATA host.  @host is allocated using
6516  *	ata_host_alloc() and fully initialized by LLD.  This function
6517  *	starts ports, registers @host with ATA and SCSI layers and
6518  *	probe registered devices.
6519  *
6520  *	LOCKING:
6521  *	Inherited from calling layer (may sleep).
6522  *
6523  *	RETURNS:
6524  *	0 on success, -errno otherwise.
6525  */
ata_host_register(struct ata_host * host,struct scsi_host_template * sht)6526 int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
6527 {
6528 	int i, rc;
6529 
6530 	host->n_tags = clamp(sht->can_queue, 1, ATA_MAX_QUEUE);
6531 
6532 	/* host must have been started */
6533 	if (!(host->flags & ATA_HOST_STARTED)) {
6534 		dev_err(host->dev, "BUG: trying to register unstarted host\n");
6535 		WARN_ON(1);
6536 		return -EINVAL;
6537 	}
6538 
6539 	/* Blow away unused ports.  This happens when LLD can't
6540 	 * determine the exact number of ports to allocate at
6541 	 * allocation time.
6542 	 */
6543 	for (i = host->n_ports; host->ports[i]; i++)
6544 		kfree(host->ports[i]);
6545 
6546 	/* give ports names and add SCSI hosts */
6547 	for (i = 0; i < host->n_ports; i++) {
6548 		host->ports[i]->print_id = atomic_inc_return(&ata_print_id);
6549 		host->ports[i]->local_port_no = i + 1;
6550 	}
6551 
6552 	/* Create associated sysfs transport objects  */
6553 	for (i = 0; i < host->n_ports; i++) {
6554 		rc = ata_tport_add(host->dev,host->ports[i]);
6555 		if (rc) {
6556 			goto err_tadd;
6557 		}
6558 	}
6559 
6560 	rc = ata_scsi_add_hosts(host, sht);
6561 	if (rc)
6562 		goto err_tadd;
6563 
6564 	/* set cable, sata_spd_limit and report */
6565 	for (i = 0; i < host->n_ports; i++) {
6566 		struct ata_port *ap = host->ports[i];
6567 		unsigned long xfer_mask;
6568 
6569 		/* set SATA cable type if still unset */
6570 		if (ap->cbl == ATA_CBL_NONE && (ap->flags & ATA_FLAG_SATA))
6571 			ap->cbl = ATA_CBL_SATA;
6572 
6573 		/* init sata_spd_limit to the current value */
6574 		sata_link_init_spd(&ap->link);
6575 		if (ap->slave_link)
6576 			sata_link_init_spd(ap->slave_link);
6577 
6578 		/* print per-port info to dmesg */
6579 		xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
6580 					      ap->udma_mask);
6581 
6582 		if (!ata_port_is_dummy(ap)) {
6583 			ata_port_info(ap, "%cATA max %s %s\n",
6584 				      (ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
6585 				      ata_mode_string(xfer_mask),
6586 				      ap->link.eh_info.desc);
6587 			ata_ehi_clear_desc(&ap->link.eh_info);
6588 		} else
6589 			ata_port_info(ap, "DUMMY\n");
6590 	}
6591 
6592 	/* perform each probe asynchronously */
6593 	for (i = 0; i < host->n_ports; i++) {
6594 		struct ata_port *ap = host->ports[i];
6595 		async_schedule(async_port_probe, ap);
6596 	}
6597 
6598 	return 0;
6599 
6600  err_tadd:
6601 	while (--i >= 0) {
6602 		ata_tport_delete(host->ports[i]);
6603 	}
6604 	return rc;
6605 
6606 }
6607 
6608 /**
6609  *	ata_host_activate - start host, request IRQ and register it
6610  *	@host: target ATA host
6611  *	@irq: IRQ to request
6612  *	@irq_handler: irq_handler used when requesting IRQ
6613  *	@irq_flags: irq_flags used when requesting IRQ
6614  *	@sht: scsi_host_template to use when registering the host
6615  *
6616  *	After allocating an ATA host and initializing it, most libata
6617  *	LLDs perform three steps to activate the host - start host,
6618  *	request IRQ and register it.  This helper takes necessary
6619  *	arguments and performs the three steps in one go.
6620  *
6621  *	An invalid IRQ skips the IRQ registration and expects the host to
6622  *	have set polling mode on the port. In this case, @irq_handler
6623  *	should be NULL.
6624  *
6625  *	LOCKING:
6626  *	Inherited from calling layer (may sleep).
6627  *
6628  *	RETURNS:
6629  *	0 on success, -errno otherwise.
6630  */
ata_host_activate(struct ata_host * host,int irq,irq_handler_t irq_handler,unsigned long irq_flags,struct scsi_host_template * sht)6631 int ata_host_activate(struct ata_host *host, int irq,
6632 		      irq_handler_t irq_handler, unsigned long irq_flags,
6633 		      struct scsi_host_template *sht)
6634 {
6635 	int i, rc;
6636 	char *irq_desc;
6637 
6638 	rc = ata_host_start(host);
6639 	if (rc)
6640 		return rc;
6641 
6642 	/* Special case for polling mode */
6643 	if (!irq) {
6644 		WARN_ON(irq_handler);
6645 		return ata_host_register(host, sht);
6646 	}
6647 
6648 	irq_desc = devm_kasprintf(host->dev, GFP_KERNEL, "%s[%s]",
6649 				  dev_driver_string(host->dev),
6650 				  dev_name(host->dev));
6651 	if (!irq_desc)
6652 		return -ENOMEM;
6653 
6654 	rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
6655 			      irq_desc, host);
6656 	if (rc)
6657 		return rc;
6658 
6659 	for (i = 0; i < host->n_ports; i++)
6660 		ata_port_desc(host->ports[i], "irq %d", irq);
6661 
6662 	rc = ata_host_register(host, sht);
6663 	/* if failed, just free the IRQ and leave ports alone */
6664 	if (rc)
6665 		devm_free_irq(host->dev, irq, host);
6666 
6667 	return rc;
6668 }
6669 
6670 /**
6671  *	ata_port_detach - Detach ATA port in preparation of device removal
6672  *	@ap: ATA port to be detached
6673  *
6674  *	Detach all ATA devices and the associated SCSI devices of @ap;
6675  *	then, remove the associated SCSI host.  @ap is guaranteed to
6676  *	be quiescent on return from this function.
6677  *
6678  *	LOCKING:
6679  *	Kernel thread context (may sleep).
6680  */
ata_port_detach(struct ata_port * ap)6681 static void ata_port_detach(struct ata_port *ap)
6682 {
6683 	unsigned long flags;
6684 	struct ata_link *link;
6685 	struct ata_device *dev;
6686 
6687 	if (!ap->ops->error_handler)
6688 		goto skip_eh;
6689 
6690 	/* tell EH we're leaving & flush EH */
6691 	spin_lock_irqsave(ap->lock, flags);
6692 	ap->pflags |= ATA_PFLAG_UNLOADING;
6693 	ata_port_schedule_eh(ap);
6694 	spin_unlock_irqrestore(ap->lock, flags);
6695 
6696 	/* wait till EH commits suicide */
6697 	ata_port_wait_eh(ap);
6698 
6699 	/* it better be dead now */
6700 	WARN_ON(!(ap->pflags & ATA_PFLAG_UNLOADED));
6701 
6702 	cancel_delayed_work_sync(&ap->hotplug_task);
6703 
6704  skip_eh:
6705 	/* clean up zpodd on port removal */
6706 	ata_for_each_link(link, ap, HOST_FIRST) {
6707 		ata_for_each_dev(dev, link, ALL) {
6708 			if (zpodd_dev_enabled(dev))
6709 				zpodd_exit(dev);
6710 		}
6711 	}
6712 	if (ap->pmp_link) {
6713 		int i;
6714 		for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
6715 			ata_tlink_delete(&ap->pmp_link[i]);
6716 	}
6717 	/* remove the associated SCSI host */
6718 	scsi_remove_host(ap->scsi_host);
6719 	ata_tport_delete(ap);
6720 }
6721 
6722 /**
6723  *	ata_host_detach - Detach all ports of an ATA host
6724  *	@host: Host to detach
6725  *
6726  *	Detach all ports of @host.
6727  *
6728  *	LOCKING:
6729  *	Kernel thread context (may sleep).
6730  */
ata_host_detach(struct ata_host * host)6731 void ata_host_detach(struct ata_host *host)
6732 {
6733 	int i;
6734 
6735 	/* Ensure ata_port probe has completed */
6736 	async_synchronize_full();
6737 
6738 	for (i = 0; i < host->n_ports; i++)
6739 		ata_port_detach(host->ports[i]);
6740 
6741 	/* the host is dead now, dissociate ACPI */
6742 	ata_acpi_dissociate(host);
6743 }
6744 
6745 #ifdef CONFIG_PCI
6746 
6747 /**
6748  *	ata_pci_remove_one - PCI layer callback for device removal
6749  *	@pdev: PCI device that was removed
6750  *
6751  *	PCI layer indicates to libata via this hook that hot-unplug or
6752  *	module unload event has occurred.  Detach all ports.  Resource
6753  *	release is handled via devres.
6754  *
6755  *	LOCKING:
6756  *	Inherited from PCI layer (may sleep).
6757  */
ata_pci_remove_one(struct pci_dev * pdev)6758 void ata_pci_remove_one(struct pci_dev *pdev)
6759 {
6760 	struct ata_host *host = pci_get_drvdata(pdev);
6761 
6762 	ata_host_detach(host);
6763 }
6764 
6765 /* move to PCI subsystem */
pci_test_config_bits(struct pci_dev * pdev,const struct pci_bits * bits)6766 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
6767 {
6768 	unsigned long tmp = 0;
6769 
6770 	switch (bits->width) {
6771 	case 1: {
6772 		u8 tmp8 = 0;
6773 		pci_read_config_byte(pdev, bits->reg, &tmp8);
6774 		tmp = tmp8;
6775 		break;
6776 	}
6777 	case 2: {
6778 		u16 tmp16 = 0;
6779 		pci_read_config_word(pdev, bits->reg, &tmp16);
6780 		tmp = tmp16;
6781 		break;
6782 	}
6783 	case 4: {
6784 		u32 tmp32 = 0;
6785 		pci_read_config_dword(pdev, bits->reg, &tmp32);
6786 		tmp = tmp32;
6787 		break;
6788 	}
6789 
6790 	default:
6791 		return -EINVAL;
6792 	}
6793 
6794 	tmp &= bits->mask;
6795 
6796 	return (tmp == bits->val) ? 1 : 0;
6797 }
6798 
6799 #ifdef CONFIG_PM
ata_pci_device_do_suspend(struct pci_dev * pdev,pm_message_t mesg)6800 void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
6801 {
6802 	pci_save_state(pdev);
6803 	pci_disable_device(pdev);
6804 
6805 	if (mesg.event & PM_EVENT_SLEEP)
6806 		pci_set_power_state(pdev, PCI_D3hot);
6807 }
6808 
ata_pci_device_do_resume(struct pci_dev * pdev)6809 int ata_pci_device_do_resume(struct pci_dev *pdev)
6810 {
6811 	int rc;
6812 
6813 	pci_set_power_state(pdev, PCI_D0);
6814 	pci_restore_state(pdev);
6815 
6816 	rc = pcim_enable_device(pdev);
6817 	if (rc) {
6818 		dev_err(&pdev->dev,
6819 			"failed to enable device after resume (%d)\n", rc);
6820 		return rc;
6821 	}
6822 
6823 	pci_set_master(pdev);
6824 	return 0;
6825 }
6826 
ata_pci_device_suspend(struct pci_dev * pdev,pm_message_t mesg)6827 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6828 {
6829 	struct ata_host *host = pci_get_drvdata(pdev);
6830 	int rc = 0;
6831 
6832 	rc = ata_host_suspend(host, mesg);
6833 	if (rc)
6834 		return rc;
6835 
6836 	ata_pci_device_do_suspend(pdev, mesg);
6837 
6838 	return 0;
6839 }
6840 
ata_pci_device_resume(struct pci_dev * pdev)6841 int ata_pci_device_resume(struct pci_dev *pdev)
6842 {
6843 	struct ata_host *host = pci_get_drvdata(pdev);
6844 	int rc;
6845 
6846 	rc = ata_pci_device_do_resume(pdev);
6847 	if (rc == 0)
6848 		ata_host_resume(host);
6849 	return rc;
6850 }
6851 #endif /* CONFIG_PM */
6852 
6853 #endif /* CONFIG_PCI */
6854 
6855 /**
6856  *	ata_platform_remove_one - Platform layer callback for device removal
6857  *	@pdev: Platform device that was removed
6858  *
6859  *	Platform layer indicates to libata via this hook that hot-unplug or
6860  *	module unload event has occurred.  Detach all ports.  Resource
6861  *	release is handled via devres.
6862  *
6863  *	LOCKING:
6864  *	Inherited from platform layer (may sleep).
6865  */
ata_platform_remove_one(struct platform_device * pdev)6866 int ata_platform_remove_one(struct platform_device *pdev)
6867 {
6868 	struct ata_host *host = platform_get_drvdata(pdev);
6869 
6870 	ata_host_detach(host);
6871 
6872 	return 0;
6873 }
6874 
ata_parse_force_one(char ** cur,struct ata_force_ent * force_ent,const char ** reason)6875 static int __init ata_parse_force_one(char **cur,
6876 				      struct ata_force_ent *force_ent,
6877 				      const char **reason)
6878 {
6879 	static const struct ata_force_param force_tbl[] __initconst = {
6880 		{ "40c",	.cbl		= ATA_CBL_PATA40 },
6881 		{ "80c",	.cbl		= ATA_CBL_PATA80 },
6882 		{ "short40c",	.cbl		= ATA_CBL_PATA40_SHORT },
6883 		{ "unk",	.cbl		= ATA_CBL_PATA_UNK },
6884 		{ "ign",	.cbl		= ATA_CBL_PATA_IGN },
6885 		{ "sata",	.cbl		= ATA_CBL_SATA },
6886 		{ "1.5Gbps",	.spd_limit	= 1 },
6887 		{ "3.0Gbps",	.spd_limit	= 2 },
6888 		{ "noncq",	.horkage_on	= ATA_HORKAGE_NONCQ },
6889 		{ "ncq",	.horkage_off	= ATA_HORKAGE_NONCQ },
6890 		{ "noncqtrim",	.horkage_on	= ATA_HORKAGE_NO_NCQ_TRIM },
6891 		{ "ncqtrim",	.horkage_off	= ATA_HORKAGE_NO_NCQ_TRIM },
6892 		{ "dump_id",	.horkage_on	= ATA_HORKAGE_DUMP_ID },
6893 		{ "pio0",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 0) },
6894 		{ "pio1",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 1) },
6895 		{ "pio2",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 2) },
6896 		{ "pio3",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 3) },
6897 		{ "pio4",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 4) },
6898 		{ "pio5",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 5) },
6899 		{ "pio6",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 6) },
6900 		{ "mwdma0",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 0) },
6901 		{ "mwdma1",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 1) },
6902 		{ "mwdma2",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 2) },
6903 		{ "mwdma3",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 3) },
6904 		{ "mwdma4",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 4) },
6905 		{ "udma0",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 0) },
6906 		{ "udma16",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 0) },
6907 		{ "udma/16",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 0) },
6908 		{ "udma1",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 1) },
6909 		{ "udma25",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 1) },
6910 		{ "udma/25",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 1) },
6911 		{ "udma2",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 2) },
6912 		{ "udma33",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 2) },
6913 		{ "udma/33",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 2) },
6914 		{ "udma3",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 3) },
6915 		{ "udma44",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 3) },
6916 		{ "udma/44",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 3) },
6917 		{ "udma4",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 4) },
6918 		{ "udma66",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 4) },
6919 		{ "udma/66",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 4) },
6920 		{ "udma5",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 5) },
6921 		{ "udma100",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 5) },
6922 		{ "udma/100",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 5) },
6923 		{ "udma6",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 6) },
6924 		{ "udma133",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 6) },
6925 		{ "udma/133",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 6) },
6926 		{ "udma7",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 7) },
6927 		{ "nohrst",	.lflags		= ATA_LFLAG_NO_HRST },
6928 		{ "nosrst",	.lflags		= ATA_LFLAG_NO_SRST },
6929 		{ "norst",	.lflags		= ATA_LFLAG_NO_HRST | ATA_LFLAG_NO_SRST },
6930 		{ "rstonce",	.lflags		= ATA_LFLAG_RST_ONCE },
6931 		{ "atapi_dmadir", .horkage_on	= ATA_HORKAGE_ATAPI_DMADIR },
6932 		{ "disable",	.horkage_on	= ATA_HORKAGE_DISABLE },
6933 	};
6934 	char *start = *cur, *p = *cur;
6935 	char *id, *val, *endp;
6936 	const struct ata_force_param *match_fp = NULL;
6937 	int nr_matches = 0, i;
6938 
6939 	/* find where this param ends and update *cur */
6940 	while (*p != '\0' && *p != ',')
6941 		p++;
6942 
6943 	if (*p == '\0')
6944 		*cur = p;
6945 	else
6946 		*cur = p + 1;
6947 
6948 	*p = '\0';
6949 
6950 	/* parse */
6951 	p = strchr(start, ':');
6952 	if (!p) {
6953 		val = strstrip(start);
6954 		goto parse_val;
6955 	}
6956 	*p = '\0';
6957 
6958 	id = strstrip(start);
6959 	val = strstrip(p + 1);
6960 
6961 	/* parse id */
6962 	p = strchr(id, '.');
6963 	if (p) {
6964 		*p++ = '\0';
6965 		force_ent->device = simple_strtoul(p, &endp, 10);
6966 		if (p == endp || *endp != '\0') {
6967 			*reason = "invalid device";
6968 			return -EINVAL;
6969 		}
6970 	}
6971 
6972 	force_ent->port = simple_strtoul(id, &endp, 10);
6973 	if (id == endp || *endp != '\0') {
6974 		*reason = "invalid port/link";
6975 		return -EINVAL;
6976 	}
6977 
6978  parse_val:
6979 	/* parse val, allow shortcuts so that both 1.5 and 1.5Gbps work */
6980 	for (i = 0; i < ARRAY_SIZE(force_tbl); i++) {
6981 		const struct ata_force_param *fp = &force_tbl[i];
6982 
6983 		if (strncasecmp(val, fp->name, strlen(val)))
6984 			continue;
6985 
6986 		nr_matches++;
6987 		match_fp = fp;
6988 
6989 		if (strcasecmp(val, fp->name) == 0) {
6990 			nr_matches = 1;
6991 			break;
6992 		}
6993 	}
6994 
6995 	if (!nr_matches) {
6996 		*reason = "unknown value";
6997 		return -EINVAL;
6998 	}
6999 	if (nr_matches > 1) {
7000 		*reason = "ambiguous value";
7001 		return -EINVAL;
7002 	}
7003 
7004 	force_ent->param = *match_fp;
7005 
7006 	return 0;
7007 }
7008 
ata_parse_force_param(void)7009 static void __init ata_parse_force_param(void)
7010 {
7011 	int idx = 0, size = 1;
7012 	int last_port = -1, last_device = -1;
7013 	char *p, *cur, *next;
7014 
7015 	/* calculate maximum number of params and allocate force_tbl */
7016 	for (p = ata_force_param_buf; *p; p++)
7017 		if (*p == ',')
7018 			size++;
7019 
7020 	ata_force_tbl = kcalloc(size, sizeof(ata_force_tbl[0]), GFP_KERNEL);
7021 	if (!ata_force_tbl) {
7022 		printk(KERN_WARNING "ata: failed to extend force table, "
7023 		       "libata.force ignored\n");
7024 		return;
7025 	}
7026 
7027 	/* parse and populate the table */
7028 	for (cur = ata_force_param_buf; *cur != '\0'; cur = next) {
7029 		const char *reason = "";
7030 		struct ata_force_ent te = { .port = -1, .device = -1 };
7031 
7032 		next = cur;
7033 		if (ata_parse_force_one(&next, &te, &reason)) {
7034 			printk(KERN_WARNING "ata: failed to parse force "
7035 			       "parameter \"%s\" (%s)\n",
7036 			       cur, reason);
7037 			continue;
7038 		}
7039 
7040 		if (te.port == -1) {
7041 			te.port = last_port;
7042 			te.device = last_device;
7043 		}
7044 
7045 		ata_force_tbl[idx++] = te;
7046 
7047 		last_port = te.port;
7048 		last_device = te.device;
7049 	}
7050 
7051 	ata_force_tbl_size = idx;
7052 }
7053 
ata_init(void)7054 static int __init ata_init(void)
7055 {
7056 	int rc;
7057 
7058 	ata_parse_force_param();
7059 
7060 	rc = ata_sff_init();
7061 	if (rc) {
7062 		kfree(ata_force_tbl);
7063 		return rc;
7064 	}
7065 
7066 	libata_transport_init();
7067 	ata_scsi_transport_template = ata_attach_transport();
7068 	if (!ata_scsi_transport_template) {
7069 		ata_sff_exit();
7070 		rc = -ENOMEM;
7071 		goto err_out;
7072 	}
7073 
7074 	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
7075 	return 0;
7076 
7077 err_out:
7078 	return rc;
7079 }
7080 
ata_exit(void)7081 static void __exit ata_exit(void)
7082 {
7083 	ata_release_transport(ata_scsi_transport_template);
7084 	libata_transport_exit();
7085 	ata_sff_exit();
7086 	kfree(ata_force_tbl);
7087 }
7088 
7089 subsys_initcall(ata_init);
7090 module_exit(ata_exit);
7091 
7092 static DEFINE_RATELIMIT_STATE(ratelimit, HZ / 5, 1);
7093 
ata_ratelimit(void)7094 int ata_ratelimit(void)
7095 {
7096 	return __ratelimit(&ratelimit);
7097 }
7098 
7099 /**
7100  *	ata_msleep - ATA EH owner aware msleep
7101  *	@ap: ATA port to attribute the sleep to
7102  *	@msecs: duration to sleep in milliseconds
7103  *
7104  *	Sleeps @msecs.  If the current task is owner of @ap's EH, the
7105  *	ownership is released before going to sleep and reacquired
7106  *	after the sleep is complete.  IOW, other ports sharing the
7107  *	@ap->host will be allowed to own the EH while this task is
7108  *	sleeping.
7109  *
7110  *	LOCKING:
7111  *	Might sleep.
7112  */
ata_msleep(struct ata_port * ap,unsigned int msecs)7113 void ata_msleep(struct ata_port *ap, unsigned int msecs)
7114 {
7115 	bool owns_eh = ap && ap->host->eh_owner == current;
7116 
7117 	if (owns_eh)
7118 		ata_eh_release(ap);
7119 
7120 	if (msecs < 20) {
7121 		unsigned long usecs = msecs * USEC_PER_MSEC;
7122 		usleep_range(usecs, usecs + 50);
7123 	} else {
7124 		msleep(msecs);
7125 	}
7126 
7127 	if (owns_eh)
7128 		ata_eh_acquire(ap);
7129 }
7130 
7131 /**
7132  *	ata_wait_register - wait until register value changes
7133  *	@ap: ATA port to wait register for, can be NULL
7134  *	@reg: IO-mapped register
7135  *	@mask: Mask to apply to read register value
7136  *	@val: Wait condition
7137  *	@interval: polling interval in milliseconds
7138  *	@timeout: timeout in milliseconds
7139  *
7140  *	Waiting for some bits of register to change is a common
7141  *	operation for ATA controllers.  This function reads 32bit LE
7142  *	IO-mapped register @reg and tests for the following condition.
7143  *
7144  *	(*@reg & mask) != val
7145  *
7146  *	If the condition is met, it returns; otherwise, the process is
7147  *	repeated after @interval_msec until timeout.
7148  *
7149  *	LOCKING:
7150  *	Kernel thread context (may sleep)
7151  *
7152  *	RETURNS:
7153  *	The final register value.
7154  */
ata_wait_register(struct ata_port * ap,void __iomem * reg,u32 mask,u32 val,unsigned long interval,unsigned long timeout)7155 u32 ata_wait_register(struct ata_port *ap, void __iomem *reg, u32 mask, u32 val,
7156 		      unsigned long interval, unsigned long timeout)
7157 {
7158 	unsigned long deadline;
7159 	u32 tmp;
7160 
7161 	tmp = ioread32(reg);
7162 
7163 	/* Calculate timeout _after_ the first read to make sure
7164 	 * preceding writes reach the controller before starting to
7165 	 * eat away the timeout.
7166 	 */
7167 	deadline = ata_deadline(jiffies, timeout);
7168 
7169 	while ((tmp & mask) == val && time_before(jiffies, deadline)) {
7170 		ata_msleep(ap, interval);
7171 		tmp = ioread32(reg);
7172 	}
7173 
7174 	return tmp;
7175 }
7176 
7177 /**
7178  *	sata_lpm_ignore_phy_events - test if PHY event should be ignored
7179  *	@link: Link receiving the event
7180  *
7181  *	Test whether the received PHY event has to be ignored or not.
7182  *
7183  *	LOCKING:
7184  *	None:
7185  *
7186  *	RETURNS:
7187  *	True if the event has to be ignored.
7188  */
sata_lpm_ignore_phy_events(struct ata_link * link)7189 bool sata_lpm_ignore_phy_events(struct ata_link *link)
7190 {
7191 	unsigned long lpm_timeout = link->last_lpm_change +
7192 				    msecs_to_jiffies(ATA_TMOUT_SPURIOUS_PHY);
7193 
7194 	/* if LPM is enabled, PHYRDY doesn't mean anything */
7195 	if (link->lpm_policy > ATA_LPM_MAX_POWER)
7196 		return true;
7197 
7198 	/* ignore the first PHY event after the LPM policy changed
7199 	 * as it is might be spurious
7200 	 */
7201 	if ((link->flags & ATA_LFLAG_CHANGED) &&
7202 	    time_before(jiffies, lpm_timeout))
7203 		return true;
7204 
7205 	return false;
7206 }
7207 EXPORT_SYMBOL_GPL(sata_lpm_ignore_phy_events);
7208 
7209 /*
7210  * Dummy port_ops
7211  */
ata_dummy_qc_issue(struct ata_queued_cmd * qc)7212 static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
7213 {
7214 	return AC_ERR_SYSTEM;
7215 }
7216 
ata_dummy_error_handler(struct ata_port * ap)7217 static void ata_dummy_error_handler(struct ata_port *ap)
7218 {
7219 	/* truly dummy */
7220 }
7221 
7222 struct ata_port_operations ata_dummy_port_ops = {
7223 	.qc_prep		= ata_noop_qc_prep,
7224 	.qc_issue		= ata_dummy_qc_issue,
7225 	.error_handler		= ata_dummy_error_handler,
7226 	.sched_eh		= ata_std_sched_eh,
7227 	.end_eh			= ata_std_end_eh,
7228 };
7229 
7230 const struct ata_port_info ata_dummy_port_info = {
7231 	.port_ops		= &ata_dummy_port_ops,
7232 };
7233 
7234 /*
7235  * Utility print functions
7236  */
ata_port_printk(const struct ata_port * ap,const char * level,const char * fmt,...)7237 void ata_port_printk(const struct ata_port *ap, const char *level,
7238 		     const char *fmt, ...)
7239 {
7240 	struct va_format vaf;
7241 	va_list args;
7242 
7243 	va_start(args, fmt);
7244 
7245 	vaf.fmt = fmt;
7246 	vaf.va = &args;
7247 
7248 	printk("%sata%u: %pV", level, ap->print_id, &vaf);
7249 
7250 	va_end(args);
7251 }
7252 EXPORT_SYMBOL(ata_port_printk);
7253 
ata_link_printk(const struct ata_link * link,const char * level,const char * fmt,...)7254 void ata_link_printk(const struct ata_link *link, const char *level,
7255 		     const char *fmt, ...)
7256 {
7257 	struct va_format vaf;
7258 	va_list args;
7259 
7260 	va_start(args, fmt);
7261 
7262 	vaf.fmt = fmt;
7263 	vaf.va = &args;
7264 
7265 	if (sata_pmp_attached(link->ap) || link->ap->slave_link)
7266 		printk("%sata%u.%02u: %pV",
7267 		       level, link->ap->print_id, link->pmp, &vaf);
7268 	else
7269 		printk("%sata%u: %pV",
7270 		       level, link->ap->print_id, &vaf);
7271 
7272 	va_end(args);
7273 }
7274 EXPORT_SYMBOL(ata_link_printk);
7275 
ata_dev_printk(const struct ata_device * dev,const char * level,const char * fmt,...)7276 void ata_dev_printk(const struct ata_device *dev, const char *level,
7277 		    const char *fmt, ...)
7278 {
7279 	struct va_format vaf;
7280 	va_list args;
7281 
7282 	va_start(args, fmt);
7283 
7284 	vaf.fmt = fmt;
7285 	vaf.va = &args;
7286 
7287 	printk("%sata%u.%02u: %pV",
7288 	       level, dev->link->ap->print_id, dev->link->pmp + dev->devno,
7289 	       &vaf);
7290 
7291 	va_end(args);
7292 }
7293 EXPORT_SYMBOL(ata_dev_printk);
7294 
ata_print_version(const struct device * dev,const char * version)7295 void ata_print_version(const struct device *dev, const char *version)
7296 {
7297 	dev_printk(KERN_DEBUG, dev, "version %s\n", version);
7298 }
7299 EXPORT_SYMBOL(ata_print_version);
7300 
7301 /*
7302  * libata is essentially a library of internal helper functions for
7303  * low-level ATA host controller drivers.  As such, the API/ABI is
7304  * likely to change as new drivers are added and updated.
7305  * Do not depend on ABI/API stability.
7306  */
7307 EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
7308 EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
7309 EXPORT_SYMBOL_GPL(sata_deb_timing_long);
7310 EXPORT_SYMBOL_GPL(ata_base_port_ops);
7311 EXPORT_SYMBOL_GPL(sata_port_ops);
7312 EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
7313 EXPORT_SYMBOL_GPL(ata_dummy_port_info);
7314 EXPORT_SYMBOL_GPL(ata_link_next);
7315 EXPORT_SYMBOL_GPL(ata_dev_next);
7316 EXPORT_SYMBOL_GPL(ata_std_bios_param);
7317 EXPORT_SYMBOL_GPL(ata_scsi_unlock_native_capacity);
7318 EXPORT_SYMBOL_GPL(ata_host_init);
7319 EXPORT_SYMBOL_GPL(ata_host_alloc);
7320 EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
7321 EXPORT_SYMBOL_GPL(ata_slave_link_init);
7322 EXPORT_SYMBOL_GPL(ata_host_start);
7323 EXPORT_SYMBOL_GPL(ata_host_register);
7324 EXPORT_SYMBOL_GPL(ata_host_activate);
7325 EXPORT_SYMBOL_GPL(ata_host_detach);
7326 EXPORT_SYMBOL_GPL(ata_sg_init);
7327 EXPORT_SYMBOL_GPL(ata_qc_complete);
7328 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
7329 EXPORT_SYMBOL_GPL(atapi_cmd_type);
7330 EXPORT_SYMBOL_GPL(ata_tf_to_fis);
7331 EXPORT_SYMBOL_GPL(ata_tf_from_fis);
7332 EXPORT_SYMBOL_GPL(ata_pack_xfermask);
7333 EXPORT_SYMBOL_GPL(ata_unpack_xfermask);
7334 EXPORT_SYMBOL_GPL(ata_xfer_mask2mode);
7335 EXPORT_SYMBOL_GPL(ata_xfer_mode2mask);
7336 EXPORT_SYMBOL_GPL(ata_xfer_mode2shift);
7337 EXPORT_SYMBOL_GPL(ata_mode_string);
7338 EXPORT_SYMBOL_GPL(ata_id_xfermask);
7339 EXPORT_SYMBOL_GPL(ata_do_set_mode);
7340 EXPORT_SYMBOL_GPL(ata_std_qc_defer);
7341 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
7342 EXPORT_SYMBOL_GPL(ata_dev_disable);
7343 EXPORT_SYMBOL_GPL(sata_set_spd);
7344 EXPORT_SYMBOL_GPL(ata_wait_after_reset);
7345 EXPORT_SYMBOL_GPL(sata_link_debounce);
7346 EXPORT_SYMBOL_GPL(sata_link_resume);
7347 EXPORT_SYMBOL_GPL(sata_link_scr_lpm);
7348 EXPORT_SYMBOL_GPL(ata_std_prereset);
7349 EXPORT_SYMBOL_GPL(sata_link_hardreset);
7350 EXPORT_SYMBOL_GPL(sata_std_hardreset);
7351 EXPORT_SYMBOL_GPL(ata_std_postreset);
7352 EXPORT_SYMBOL_GPL(ata_dev_classify);
7353 EXPORT_SYMBOL_GPL(ata_dev_pair);
7354 EXPORT_SYMBOL_GPL(ata_ratelimit);
7355 EXPORT_SYMBOL_GPL(ata_msleep);
7356 EXPORT_SYMBOL_GPL(ata_wait_register);
7357 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
7358 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
7359 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
7360 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
7361 EXPORT_SYMBOL_GPL(__ata_change_queue_depth);
7362 EXPORT_SYMBOL_GPL(sata_scr_valid);
7363 EXPORT_SYMBOL_GPL(sata_scr_read);
7364 EXPORT_SYMBOL_GPL(sata_scr_write);
7365 EXPORT_SYMBOL_GPL(sata_scr_write_flush);
7366 EXPORT_SYMBOL_GPL(ata_link_online);
7367 EXPORT_SYMBOL_GPL(ata_link_offline);
7368 #ifdef CONFIG_PM
7369 EXPORT_SYMBOL_GPL(ata_host_suspend);
7370 EXPORT_SYMBOL_GPL(ata_host_resume);
7371 #endif /* CONFIG_PM */
7372 EXPORT_SYMBOL_GPL(ata_id_string);
7373 EXPORT_SYMBOL_GPL(ata_id_c_string);
7374 EXPORT_SYMBOL_GPL(ata_do_dev_read_id);
7375 EXPORT_SYMBOL_GPL(ata_scsi_simulate);
7376 
7377 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
7378 EXPORT_SYMBOL_GPL(ata_timing_find_mode);
7379 EXPORT_SYMBOL_GPL(ata_timing_compute);
7380 EXPORT_SYMBOL_GPL(ata_timing_merge);
7381 EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
7382 
7383 #ifdef CONFIG_PCI
7384 EXPORT_SYMBOL_GPL(pci_test_config_bits);
7385 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
7386 #ifdef CONFIG_PM
7387 EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
7388 EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
7389 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
7390 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
7391 #endif /* CONFIG_PM */
7392 #endif /* CONFIG_PCI */
7393 
7394 EXPORT_SYMBOL_GPL(ata_platform_remove_one);
7395 
7396 EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
7397 EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
7398 EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
7399 EXPORT_SYMBOL_GPL(ata_port_desc);
7400 #ifdef CONFIG_PCI
7401 EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
7402 #endif /* CONFIG_PCI */
7403 EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
7404 EXPORT_SYMBOL_GPL(ata_link_abort);
7405 EXPORT_SYMBOL_GPL(ata_port_abort);
7406 EXPORT_SYMBOL_GPL(ata_port_freeze);
7407 EXPORT_SYMBOL_GPL(sata_async_notification);
7408 EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
7409 EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
7410 EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
7411 EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
7412 EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error);
7413 EXPORT_SYMBOL_GPL(ata_do_eh);
7414 EXPORT_SYMBOL_GPL(ata_std_error_handler);
7415 
7416 EXPORT_SYMBOL_GPL(ata_cable_40wire);
7417 EXPORT_SYMBOL_GPL(ata_cable_80wire);
7418 EXPORT_SYMBOL_GPL(ata_cable_unknown);
7419 EXPORT_SYMBOL_GPL(ata_cable_ignore);
7420 EXPORT_SYMBOL_GPL(ata_cable_sata);
7421 EXPORT_SYMBOL_GPL(ata_host_get);
7422 EXPORT_SYMBOL_GPL(ata_host_put);
7423