1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  libata-core.c - helper library for ATA
4  *
5  *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
6  *  Copyright 2003-2004 Jeff Garzik
7  *
8  *  libata documentation is available via 'make {ps|pdf}docs',
9  *  as Documentation/driver-api/libata.rst
10  *
11  *  Hardware documentation available from http://www.t13.org/ and
12  *  http://www.sata-io.org/
13  *
14  *  Standards documents from:
15  *	http://www.t13.org (ATA standards, PCI DMA IDE spec)
16  *	http://www.t10.org (SCSI MMC - for ATAPI MMC)
17  *	http://www.sata-io.org (SATA)
18  *	http://www.compactflash.org (CF)
19  *	http://www.qic.org (QIC157 - Tape and DSC)
20  *	http://www.ce-ata.org (CE-ATA: not supported)
21  *
22  * libata is essentially a library of internal helper functions for
23  * low-level ATA host controller drivers.  As such, the API/ABI is
24  * likely to change as new drivers are added and updated.
25  * Do not depend on ABI/API stability.
26  */
27 
28 #include <linux/kernel.h>
29 #include <linux/module.h>
30 #include <linux/pci.h>
31 #include <linux/init.h>
32 #include <linux/list.h>
33 #include <linux/mm.h>
34 #include <linux/spinlock.h>
35 #include <linux/blkdev.h>
36 #include <linux/delay.h>
37 #include <linux/timer.h>
38 #include <linux/time.h>
39 #include <linux/interrupt.h>
40 #include <linux/completion.h>
41 #include <linux/suspend.h>
42 #include <linux/workqueue.h>
43 #include <linux/scatterlist.h>
44 #include <linux/io.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 #include <asm/setup.h>
60 
61 #define CREATE_TRACE_POINTS
62 #include <trace/events/libata.h>
63 
64 #include "libata.h"
65 #include "libata-transport.h"
66 
67 const struct ata_port_operations ata_base_port_ops = {
68 	.prereset		= ata_std_prereset,
69 	.postreset		= ata_std_postreset,
70 	.error_handler		= ata_std_error_handler,
71 	.sched_eh		= ata_std_sched_eh,
72 	.end_eh			= ata_std_end_eh,
73 };
74 
75 const struct ata_port_operations sata_port_ops = {
76 	.inherits		= &ata_base_port_ops,
77 
78 	.qc_defer		= ata_std_qc_defer,
79 	.hardreset		= sata_std_hardreset,
80 };
81 EXPORT_SYMBOL_GPL(sata_port_ops);
82 
83 static unsigned int ata_dev_init_params(struct ata_device *dev,
84 					u16 heads, u16 sectors);
85 static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
86 static void ata_dev_xfermask(struct ata_device *dev);
87 static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
88 
89 atomic_t ata_print_id = ATOMIC_INIT(0);
90 
91 #ifdef CONFIG_ATA_FORCE
92 struct ata_force_param {
93 	const char	*name;
94 	u8		cbl;
95 	u8		spd_limit;
96 	unsigned long	xfer_mask;
97 	unsigned int	horkage_on;
98 	unsigned int	horkage_off;
99 	u16		lflags_on;
100 	u16		lflags_off;
101 };
102 
103 struct ata_force_ent {
104 	int			port;
105 	int			device;
106 	struct ata_force_param	param;
107 };
108 
109 static struct ata_force_ent *ata_force_tbl;
110 static int ata_force_tbl_size;
111 
112 static char ata_force_param_buf[COMMAND_LINE_SIZE] __initdata;
113 /* param_buf is thrown away after initialization, disallow read */
114 module_param_string(force, ata_force_param_buf, sizeof(ata_force_param_buf), 0);
115 MODULE_PARM_DESC(force, "Force ATA configurations including cable type, link speed and transfer mode (see Documentation/admin-guide/kernel-parameters.rst for details)");
116 #endif
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 
ata_dev_print_info(struct ata_device * dev)163 static inline bool ata_dev_print_info(struct ata_device *dev)
164 {
165 	struct ata_eh_context *ehc = &dev->link->eh_context;
166 
167 	return ehc->i.flags & ATA_EHI_PRINTINFO;
168 }
169 
ata_sstatus_online(u32 sstatus)170 static bool ata_sstatus_online(u32 sstatus)
171 {
172 	return (sstatus & 0xf) == 0x3;
173 }
174 
175 /**
176  *	ata_link_next - link iteration helper
177  *	@link: the previous link, NULL to start
178  *	@ap: ATA port containing links to iterate
179  *	@mode: iteration mode, one of ATA_LITER_*
180  *
181  *	LOCKING:
182  *	Host lock or EH context.
183  *
184  *	RETURNS:
185  *	Pointer to the next link.
186  */
ata_link_next(struct ata_link * link,struct ata_port * ap,enum ata_link_iter_mode mode)187 struct ata_link *ata_link_next(struct ata_link *link, struct ata_port *ap,
188 			       enum ata_link_iter_mode mode)
189 {
190 	BUG_ON(mode != ATA_LITER_EDGE &&
191 	       mode != ATA_LITER_PMP_FIRST && mode != ATA_LITER_HOST_FIRST);
192 
193 	/* NULL link indicates start of iteration */
194 	if (!link)
195 		switch (mode) {
196 		case ATA_LITER_EDGE:
197 		case ATA_LITER_PMP_FIRST:
198 			if (sata_pmp_attached(ap))
199 				return ap->pmp_link;
200 			fallthrough;
201 		case ATA_LITER_HOST_FIRST:
202 			return &ap->link;
203 		}
204 
205 	/* we just iterated over the host link, what's next? */
206 	if (link == &ap->link)
207 		switch (mode) {
208 		case ATA_LITER_HOST_FIRST:
209 			if (sata_pmp_attached(ap))
210 				return ap->pmp_link;
211 			fallthrough;
212 		case ATA_LITER_PMP_FIRST:
213 			if (unlikely(ap->slave_link))
214 				return ap->slave_link;
215 			fallthrough;
216 		case ATA_LITER_EDGE:
217 			return NULL;
218 		}
219 
220 	/* slave_link excludes PMP */
221 	if (unlikely(link == ap->slave_link))
222 		return NULL;
223 
224 	/* we were over a PMP link */
225 	if (++link < ap->pmp_link + ap->nr_pmp_links)
226 		return link;
227 
228 	if (mode == ATA_LITER_PMP_FIRST)
229 		return &ap->link;
230 
231 	return NULL;
232 }
233 EXPORT_SYMBOL_GPL(ata_link_next);
234 
235 /**
236  *	ata_dev_next - device iteration helper
237  *	@dev: the previous device, NULL to start
238  *	@link: ATA link containing devices to iterate
239  *	@mode: iteration mode, one of ATA_DITER_*
240  *
241  *	LOCKING:
242  *	Host lock or EH context.
243  *
244  *	RETURNS:
245  *	Pointer to the next device.
246  */
ata_dev_next(struct ata_device * dev,struct ata_link * link,enum ata_dev_iter_mode mode)247 struct ata_device *ata_dev_next(struct ata_device *dev, struct ata_link *link,
248 				enum ata_dev_iter_mode mode)
249 {
250 	BUG_ON(mode != ATA_DITER_ENABLED && mode != ATA_DITER_ENABLED_REVERSE &&
251 	       mode != ATA_DITER_ALL && mode != ATA_DITER_ALL_REVERSE);
252 
253 	/* NULL dev indicates start of iteration */
254 	if (!dev)
255 		switch (mode) {
256 		case ATA_DITER_ENABLED:
257 		case ATA_DITER_ALL:
258 			dev = link->device;
259 			goto check;
260 		case ATA_DITER_ENABLED_REVERSE:
261 		case ATA_DITER_ALL_REVERSE:
262 			dev = link->device + ata_link_max_devices(link) - 1;
263 			goto check;
264 		}
265 
266  next:
267 	/* move to the next one */
268 	switch (mode) {
269 	case ATA_DITER_ENABLED:
270 	case ATA_DITER_ALL:
271 		if (++dev < link->device + ata_link_max_devices(link))
272 			goto check;
273 		return NULL;
274 	case ATA_DITER_ENABLED_REVERSE:
275 	case ATA_DITER_ALL_REVERSE:
276 		if (--dev >= link->device)
277 			goto check;
278 		return NULL;
279 	}
280 
281  check:
282 	if ((mode == ATA_DITER_ENABLED || mode == ATA_DITER_ENABLED_REVERSE) &&
283 	    !ata_dev_enabled(dev))
284 		goto next;
285 	return dev;
286 }
287 EXPORT_SYMBOL_GPL(ata_dev_next);
288 
289 /**
290  *	ata_dev_phys_link - find physical link for a device
291  *	@dev: ATA device to look up physical link for
292  *
293  *	Look up physical link which @dev is attached to.  Note that
294  *	this is different from @dev->link only when @dev is on slave
295  *	link.  For all other cases, it's the same as @dev->link.
296  *
297  *	LOCKING:
298  *	Don't care.
299  *
300  *	RETURNS:
301  *	Pointer to the found physical link.
302  */
ata_dev_phys_link(struct ata_device * dev)303 struct ata_link *ata_dev_phys_link(struct ata_device *dev)
304 {
305 	struct ata_port *ap = dev->link->ap;
306 
307 	if (!ap->slave_link)
308 		return dev->link;
309 	if (!dev->devno)
310 		return &ap->link;
311 	return ap->slave_link;
312 }
313 
314 #ifdef CONFIG_ATA_FORCE
315 /**
316  *	ata_force_cbl - force cable type according to libata.force
317  *	@ap: ATA port of interest
318  *
319  *	Force cable type according to libata.force and whine about it.
320  *	The last entry which has matching port number is used, so it
321  *	can be specified as part of device force parameters.  For
322  *	example, both "a:40c,1.00:udma4" and "1.00:40c,udma4" have the
323  *	same effect.
324  *
325  *	LOCKING:
326  *	EH context.
327  */
ata_force_cbl(struct ata_port * ap)328 void ata_force_cbl(struct ata_port *ap)
329 {
330 	int i;
331 
332 	for (i = ata_force_tbl_size - 1; i >= 0; i--) {
333 		const struct ata_force_ent *fe = &ata_force_tbl[i];
334 
335 		if (fe->port != -1 && fe->port != ap->print_id)
336 			continue;
337 
338 		if (fe->param.cbl == ATA_CBL_NONE)
339 			continue;
340 
341 		ap->cbl = fe->param.cbl;
342 		ata_port_notice(ap, "FORCE: cable set to %s\n", fe->param.name);
343 		return;
344 	}
345 }
346 
347 /**
348  *	ata_force_link_limits - force link limits according to libata.force
349  *	@link: ATA link of interest
350  *
351  *	Force link flags and SATA spd limit according to libata.force
352  *	and whine about it.  When only the port part is specified
353  *	(e.g. 1:), the limit applies to all links connected to both
354  *	the host link and all fan-out ports connected via PMP.  If the
355  *	device part is specified as 0 (e.g. 1.00:), it specifies the
356  *	first fan-out link not the host link.  Device number 15 always
357  *	points to the host link whether PMP is attached or not.  If the
358  *	controller has slave link, device number 16 points to it.
359  *
360  *	LOCKING:
361  *	EH context.
362  */
ata_force_link_limits(struct ata_link * link)363 static void ata_force_link_limits(struct ata_link *link)
364 {
365 	bool did_spd = false;
366 	int linkno = link->pmp;
367 	int i;
368 
369 	if (ata_is_host_link(link))
370 		linkno += 15;
371 
372 	for (i = ata_force_tbl_size - 1; i >= 0; i--) {
373 		const struct ata_force_ent *fe = &ata_force_tbl[i];
374 
375 		if (fe->port != -1 && fe->port != link->ap->print_id)
376 			continue;
377 
378 		if (fe->device != -1 && fe->device != linkno)
379 			continue;
380 
381 		/* only honor the first spd limit */
382 		if (!did_spd && fe->param.spd_limit) {
383 			link->hw_sata_spd_limit = (1 << fe->param.spd_limit) - 1;
384 			ata_link_notice(link, "FORCE: PHY spd limit set to %s\n",
385 					fe->param.name);
386 			did_spd = true;
387 		}
388 
389 		/* let lflags stack */
390 		if (fe->param.lflags_on) {
391 			link->flags |= fe->param.lflags_on;
392 			ata_link_notice(link,
393 					"FORCE: link flag 0x%x forced -> 0x%x\n",
394 					fe->param.lflags_on, link->flags);
395 		}
396 		if (fe->param.lflags_off) {
397 			link->flags &= ~fe->param.lflags_off;
398 			ata_link_notice(link,
399 				"FORCE: link flag 0x%x cleared -> 0x%x\n",
400 				fe->param.lflags_off, link->flags);
401 		}
402 	}
403 }
404 
405 /**
406  *	ata_force_xfermask - force xfermask according to libata.force
407  *	@dev: ATA device of interest
408  *
409  *	Force xfer_mask according to libata.force and whine about it.
410  *	For consistency with link selection, device number 15 selects
411  *	the first device connected to the host link.
412  *
413  *	LOCKING:
414  *	EH context.
415  */
ata_force_xfermask(struct ata_device * dev)416 static void ata_force_xfermask(struct ata_device *dev)
417 {
418 	int devno = dev->link->pmp + dev->devno;
419 	int alt_devno = devno;
420 	int i;
421 
422 	/* allow n.15/16 for devices attached to host port */
423 	if (ata_is_host_link(dev->link))
424 		alt_devno += 15;
425 
426 	for (i = ata_force_tbl_size - 1; i >= 0; i--) {
427 		const struct ata_force_ent *fe = &ata_force_tbl[i];
428 		unsigned long pio_mask, mwdma_mask, udma_mask;
429 
430 		if (fe->port != -1 && fe->port != dev->link->ap->print_id)
431 			continue;
432 
433 		if (fe->device != -1 && fe->device != devno &&
434 		    fe->device != alt_devno)
435 			continue;
436 
437 		if (!fe->param.xfer_mask)
438 			continue;
439 
440 		ata_unpack_xfermask(fe->param.xfer_mask,
441 				    &pio_mask, &mwdma_mask, &udma_mask);
442 		if (udma_mask)
443 			dev->udma_mask = udma_mask;
444 		else if (mwdma_mask) {
445 			dev->udma_mask = 0;
446 			dev->mwdma_mask = mwdma_mask;
447 		} else {
448 			dev->udma_mask = 0;
449 			dev->mwdma_mask = 0;
450 			dev->pio_mask = pio_mask;
451 		}
452 
453 		ata_dev_notice(dev, "FORCE: xfer_mask set to %s\n",
454 			       fe->param.name);
455 		return;
456 	}
457 }
458 
459 /**
460  *	ata_force_horkage - force horkage according to libata.force
461  *	@dev: ATA device of interest
462  *
463  *	Force horkage according to libata.force and whine about it.
464  *	For consistency with link selection, device number 15 selects
465  *	the first device connected to the host link.
466  *
467  *	LOCKING:
468  *	EH context.
469  */
ata_force_horkage(struct ata_device * dev)470 static void ata_force_horkage(struct ata_device *dev)
471 {
472 	int devno = dev->link->pmp + dev->devno;
473 	int alt_devno = devno;
474 	int i;
475 
476 	/* allow n.15/16 for devices attached to host port */
477 	if (ata_is_host_link(dev->link))
478 		alt_devno += 15;
479 
480 	for (i = 0; i < ata_force_tbl_size; i++) {
481 		const struct ata_force_ent *fe = &ata_force_tbl[i];
482 
483 		if (fe->port != -1 && fe->port != dev->link->ap->print_id)
484 			continue;
485 
486 		if (fe->device != -1 && fe->device != devno &&
487 		    fe->device != alt_devno)
488 			continue;
489 
490 		if (!(~dev->horkage & fe->param.horkage_on) &&
491 		    !(dev->horkage & fe->param.horkage_off))
492 			continue;
493 
494 		dev->horkage |= fe->param.horkage_on;
495 		dev->horkage &= ~fe->param.horkage_off;
496 
497 		ata_dev_notice(dev, "FORCE: horkage modified (%s)\n",
498 			       fe->param.name);
499 	}
500 }
501 #else
ata_force_link_limits(struct ata_link * link)502 static inline void ata_force_link_limits(struct ata_link *link) { }
ata_force_xfermask(struct ata_device * dev)503 static inline void ata_force_xfermask(struct ata_device *dev) { }
ata_force_horkage(struct ata_device * dev)504 static inline void ata_force_horkage(struct ata_device *dev) { }
505 #endif
506 
507 /**
508  *	atapi_cmd_type - Determine ATAPI command type from SCSI opcode
509  *	@opcode: SCSI opcode
510  *
511  *	Determine ATAPI command type from @opcode.
512  *
513  *	LOCKING:
514  *	None.
515  *
516  *	RETURNS:
517  *	ATAPI_{READ|WRITE|READ_CD|PASS_THRU|MISC}
518  */
atapi_cmd_type(u8 opcode)519 int atapi_cmd_type(u8 opcode)
520 {
521 	switch (opcode) {
522 	case GPCMD_READ_10:
523 	case GPCMD_READ_12:
524 		return ATAPI_READ;
525 
526 	case GPCMD_WRITE_10:
527 	case GPCMD_WRITE_12:
528 	case GPCMD_WRITE_AND_VERIFY_10:
529 		return ATAPI_WRITE;
530 
531 	case GPCMD_READ_CD:
532 	case GPCMD_READ_CD_MSF:
533 		return ATAPI_READ_CD;
534 
535 	case ATA_16:
536 	case ATA_12:
537 		if (atapi_passthru16)
538 			return ATAPI_PASS_THRU;
539 		fallthrough;
540 	default:
541 		return ATAPI_MISC;
542 	}
543 }
544 EXPORT_SYMBOL_GPL(atapi_cmd_type);
545 
546 static const u8 ata_rw_cmds[] = {
547 	/* pio multi */
548 	ATA_CMD_READ_MULTI,
549 	ATA_CMD_WRITE_MULTI,
550 	ATA_CMD_READ_MULTI_EXT,
551 	ATA_CMD_WRITE_MULTI_EXT,
552 	0,
553 	0,
554 	0,
555 	ATA_CMD_WRITE_MULTI_FUA_EXT,
556 	/* pio */
557 	ATA_CMD_PIO_READ,
558 	ATA_CMD_PIO_WRITE,
559 	ATA_CMD_PIO_READ_EXT,
560 	ATA_CMD_PIO_WRITE_EXT,
561 	0,
562 	0,
563 	0,
564 	0,
565 	/* dma */
566 	ATA_CMD_READ,
567 	ATA_CMD_WRITE,
568 	ATA_CMD_READ_EXT,
569 	ATA_CMD_WRITE_EXT,
570 	0,
571 	0,
572 	0,
573 	ATA_CMD_WRITE_FUA_EXT
574 };
575 
576 /**
577  *	ata_rwcmd_protocol - set taskfile r/w commands and protocol
578  *	@tf: command to examine and configure
579  *	@dev: device tf belongs to
580  *
581  *	Examine the device configuration and tf->flags to calculate
582  *	the proper read/write commands and protocol to use.
583  *
584  *	LOCKING:
585  *	caller.
586  */
ata_rwcmd_protocol(struct ata_taskfile * tf,struct ata_device * dev)587 static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
588 {
589 	u8 cmd;
590 
591 	int index, fua, lba48, write;
592 
593 	fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
594 	lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
595 	write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
596 
597 	if (dev->flags & ATA_DFLAG_PIO) {
598 		tf->protocol = ATA_PROT_PIO;
599 		index = dev->multi_count ? 0 : 8;
600 	} else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
601 		/* Unable to use DMA due to host limitation */
602 		tf->protocol = ATA_PROT_PIO;
603 		index = dev->multi_count ? 0 : 8;
604 	} else {
605 		tf->protocol = ATA_PROT_DMA;
606 		index = 16;
607 	}
608 
609 	cmd = ata_rw_cmds[index + fua + lba48 + write];
610 	if (cmd) {
611 		tf->command = cmd;
612 		return 0;
613 	}
614 	return -1;
615 }
616 
617 /**
618  *	ata_tf_read_block - Read block address from ATA taskfile
619  *	@tf: ATA taskfile of interest
620  *	@dev: ATA device @tf belongs to
621  *
622  *	LOCKING:
623  *	None.
624  *
625  *	Read block address from @tf.  This function can handle all
626  *	three address formats - LBA, LBA48 and CHS.  tf->protocol and
627  *	flags select the address format to use.
628  *
629  *	RETURNS:
630  *	Block address read from @tf.
631  */
ata_tf_read_block(const struct ata_taskfile * tf,struct ata_device * dev)632 u64 ata_tf_read_block(const struct ata_taskfile *tf, struct ata_device *dev)
633 {
634 	u64 block = 0;
635 
636 	if (tf->flags & ATA_TFLAG_LBA) {
637 		if (tf->flags & ATA_TFLAG_LBA48) {
638 			block |= (u64)tf->hob_lbah << 40;
639 			block |= (u64)tf->hob_lbam << 32;
640 			block |= (u64)tf->hob_lbal << 24;
641 		} else
642 			block |= (tf->device & 0xf) << 24;
643 
644 		block |= tf->lbah << 16;
645 		block |= tf->lbam << 8;
646 		block |= tf->lbal;
647 	} else {
648 		u32 cyl, head, sect;
649 
650 		cyl = tf->lbam | (tf->lbah << 8);
651 		head = tf->device & 0xf;
652 		sect = tf->lbal;
653 
654 		if (!sect) {
655 			ata_dev_warn(dev,
656 				     "device reported invalid CHS sector 0\n");
657 			return U64_MAX;
658 		}
659 
660 		block = (cyl * dev->heads + head) * dev->sectors + sect - 1;
661 	}
662 
663 	return block;
664 }
665 
666 /**
667  *	ata_build_rw_tf - Build ATA taskfile for given read/write request
668  *	@tf: Target ATA taskfile
669  *	@dev: ATA device @tf belongs to
670  *	@block: Block address
671  *	@n_block: Number of blocks
672  *	@tf_flags: RW/FUA etc...
673  *	@tag: tag
674  *	@class: IO priority class
675  *
676  *	LOCKING:
677  *	None.
678  *
679  *	Build ATA taskfile @tf for read/write request described by
680  *	@block, @n_block, @tf_flags and @tag on @dev.
681  *
682  *	RETURNS:
683  *
684  *	0 on success, -ERANGE if the request is too large for @dev,
685  *	-EINVAL if the request is invalid.
686  */
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)687 int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
688 		    u64 block, u32 n_block, unsigned int tf_flags,
689 		    unsigned int tag, int class)
690 {
691 	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
692 	tf->flags |= tf_flags;
693 
694 	if (ata_ncq_enabled(dev) && !ata_tag_internal(tag)) {
695 		/* yay, NCQ */
696 		if (!lba_48_ok(block, n_block))
697 			return -ERANGE;
698 
699 		tf->protocol = ATA_PROT_NCQ;
700 		tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
701 
702 		if (tf->flags & ATA_TFLAG_WRITE)
703 			tf->command = ATA_CMD_FPDMA_WRITE;
704 		else
705 			tf->command = ATA_CMD_FPDMA_READ;
706 
707 		tf->nsect = tag << 3;
708 		tf->hob_feature = (n_block >> 8) & 0xff;
709 		tf->feature = n_block & 0xff;
710 
711 		tf->hob_lbah = (block >> 40) & 0xff;
712 		tf->hob_lbam = (block >> 32) & 0xff;
713 		tf->hob_lbal = (block >> 24) & 0xff;
714 		tf->lbah = (block >> 16) & 0xff;
715 		tf->lbam = (block >> 8) & 0xff;
716 		tf->lbal = block & 0xff;
717 
718 		tf->device = ATA_LBA;
719 		if (tf->flags & ATA_TFLAG_FUA)
720 			tf->device |= 1 << 7;
721 
722 		if (dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLE &&
723 		    class == IOPRIO_CLASS_RT)
724 			tf->hob_nsect |= ATA_PRIO_HIGH << ATA_SHIFT_PRIO;
725 	} else if (dev->flags & ATA_DFLAG_LBA) {
726 		tf->flags |= ATA_TFLAG_LBA;
727 
728 		if (lba_28_ok(block, n_block)) {
729 			/* use LBA28 */
730 			tf->device |= (block >> 24) & 0xf;
731 		} else if (lba_48_ok(block, n_block)) {
732 			if (!(dev->flags & ATA_DFLAG_LBA48))
733 				return -ERANGE;
734 
735 			/* use LBA48 */
736 			tf->flags |= ATA_TFLAG_LBA48;
737 
738 			tf->hob_nsect = (n_block >> 8) & 0xff;
739 
740 			tf->hob_lbah = (block >> 40) & 0xff;
741 			tf->hob_lbam = (block >> 32) & 0xff;
742 			tf->hob_lbal = (block >> 24) & 0xff;
743 		} else
744 			/* request too large even for LBA48 */
745 			return -ERANGE;
746 
747 		if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
748 			return -EINVAL;
749 
750 		tf->nsect = n_block & 0xff;
751 
752 		tf->lbah = (block >> 16) & 0xff;
753 		tf->lbam = (block >> 8) & 0xff;
754 		tf->lbal = block & 0xff;
755 
756 		tf->device |= ATA_LBA;
757 	} else {
758 		/* CHS */
759 		u32 sect, head, cyl, track;
760 
761 		/* The request -may- be too large for CHS addressing. */
762 		if (!lba_28_ok(block, n_block))
763 			return -ERANGE;
764 
765 		if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
766 			return -EINVAL;
767 
768 		/* Convert LBA to CHS */
769 		track = (u32)block / dev->sectors;
770 		cyl   = track / dev->heads;
771 		head  = track % dev->heads;
772 		sect  = (u32)block % dev->sectors + 1;
773 
774 		/* Check whether the converted CHS can fit.
775 		   Cylinder: 0-65535
776 		   Head: 0-15
777 		   Sector: 1-255*/
778 		if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
779 			return -ERANGE;
780 
781 		tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
782 		tf->lbal = sect;
783 		tf->lbam = cyl;
784 		tf->lbah = cyl >> 8;
785 		tf->device |= head;
786 	}
787 
788 	return 0;
789 }
790 
791 /**
792  *	ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
793  *	@pio_mask: pio_mask
794  *	@mwdma_mask: mwdma_mask
795  *	@udma_mask: udma_mask
796  *
797  *	Pack @pio_mask, @mwdma_mask and @udma_mask into a single
798  *	unsigned int xfer_mask.
799  *
800  *	LOCKING:
801  *	None.
802  *
803  *	RETURNS:
804  *	Packed xfer_mask.
805  */
ata_pack_xfermask(unsigned long pio_mask,unsigned long mwdma_mask,unsigned long udma_mask)806 unsigned long ata_pack_xfermask(unsigned long pio_mask,
807 				unsigned long mwdma_mask,
808 				unsigned long udma_mask)
809 {
810 	return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
811 		((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
812 		((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
813 }
814 EXPORT_SYMBOL_GPL(ata_pack_xfermask);
815 
816 /**
817  *	ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
818  *	@xfer_mask: xfer_mask to unpack
819  *	@pio_mask: resulting pio_mask
820  *	@mwdma_mask: resulting mwdma_mask
821  *	@udma_mask: resulting udma_mask
822  *
823  *	Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
824  *	Any NULL destination masks will be ignored.
825  */
ata_unpack_xfermask(unsigned long xfer_mask,unsigned long * pio_mask,unsigned long * mwdma_mask,unsigned long * udma_mask)826 void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
827 			 unsigned long *mwdma_mask, unsigned long *udma_mask)
828 {
829 	if (pio_mask)
830 		*pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
831 	if (mwdma_mask)
832 		*mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
833 	if (udma_mask)
834 		*udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
835 }
836 
837 static const struct ata_xfer_ent {
838 	int shift, bits;
839 	u8 base;
840 } ata_xfer_tbl[] = {
841 	{ ATA_SHIFT_PIO, ATA_NR_PIO_MODES, XFER_PIO_0 },
842 	{ ATA_SHIFT_MWDMA, ATA_NR_MWDMA_MODES, XFER_MW_DMA_0 },
843 	{ ATA_SHIFT_UDMA, ATA_NR_UDMA_MODES, XFER_UDMA_0 },
844 	{ -1, },
845 };
846 
847 /**
848  *	ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
849  *	@xfer_mask: xfer_mask of interest
850  *
851  *	Return matching XFER_* value for @xfer_mask.  Only the highest
852  *	bit of @xfer_mask is considered.
853  *
854  *	LOCKING:
855  *	None.
856  *
857  *	RETURNS:
858  *	Matching XFER_* value, 0xff if no match found.
859  */
ata_xfer_mask2mode(unsigned long xfer_mask)860 u8 ata_xfer_mask2mode(unsigned long xfer_mask)
861 {
862 	int highbit = fls(xfer_mask) - 1;
863 	const struct ata_xfer_ent *ent;
864 
865 	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
866 		if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
867 			return ent->base + highbit - ent->shift;
868 	return 0xff;
869 }
870 EXPORT_SYMBOL_GPL(ata_xfer_mask2mode);
871 
872 /**
873  *	ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
874  *	@xfer_mode: XFER_* of interest
875  *
876  *	Return matching xfer_mask for @xfer_mode.
877  *
878  *	LOCKING:
879  *	None.
880  *
881  *	RETURNS:
882  *	Matching xfer_mask, 0 if no match found.
883  */
ata_xfer_mode2mask(u8 xfer_mode)884 unsigned long ata_xfer_mode2mask(u8 xfer_mode)
885 {
886 	const struct ata_xfer_ent *ent;
887 
888 	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
889 		if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
890 			return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
891 				& ~((1 << ent->shift) - 1);
892 	return 0;
893 }
894 EXPORT_SYMBOL_GPL(ata_xfer_mode2mask);
895 
896 /**
897  *	ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
898  *	@xfer_mode: XFER_* of interest
899  *
900  *	Return matching xfer_shift for @xfer_mode.
901  *
902  *	LOCKING:
903  *	None.
904  *
905  *	RETURNS:
906  *	Matching xfer_shift, -1 if no match found.
907  */
ata_xfer_mode2shift(u8 xfer_mode)908 int ata_xfer_mode2shift(u8 xfer_mode)
909 {
910 	const struct ata_xfer_ent *ent;
911 
912 	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
913 		if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
914 			return ent->shift;
915 	return -1;
916 }
917 EXPORT_SYMBOL_GPL(ata_xfer_mode2shift);
918 
919 /**
920  *	ata_mode_string - convert xfer_mask to string
921  *	@xfer_mask: mask of bits supported; only highest bit counts.
922  *
923  *	Determine string which represents the highest speed
924  *	(highest bit in @modemask).
925  *
926  *	LOCKING:
927  *	None.
928  *
929  *	RETURNS:
930  *	Constant C string representing highest speed listed in
931  *	@mode_mask, or the constant C string "<n/a>".
932  */
ata_mode_string(unsigned long xfer_mask)933 const char *ata_mode_string(unsigned long xfer_mask)
934 {
935 	static const char * const xfer_mode_str[] = {
936 		"PIO0",
937 		"PIO1",
938 		"PIO2",
939 		"PIO3",
940 		"PIO4",
941 		"PIO5",
942 		"PIO6",
943 		"MWDMA0",
944 		"MWDMA1",
945 		"MWDMA2",
946 		"MWDMA3",
947 		"MWDMA4",
948 		"UDMA/16",
949 		"UDMA/25",
950 		"UDMA/33",
951 		"UDMA/44",
952 		"UDMA/66",
953 		"UDMA/100",
954 		"UDMA/133",
955 		"UDMA7",
956 	};
957 	int highbit;
958 
959 	highbit = fls(xfer_mask) - 1;
960 	if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
961 		return xfer_mode_str[highbit];
962 	return "<n/a>";
963 }
964 EXPORT_SYMBOL_GPL(ata_mode_string);
965 
sata_spd_string(unsigned int spd)966 const char *sata_spd_string(unsigned int spd)
967 {
968 	static const char * const spd_str[] = {
969 		"1.5 Gbps",
970 		"3.0 Gbps",
971 		"6.0 Gbps",
972 	};
973 
974 	if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
975 		return "<unknown>";
976 	return spd_str[spd - 1];
977 }
978 
979 /**
980  *	ata_dev_classify - determine device type based on ATA-spec signature
981  *	@tf: ATA taskfile register set for device to be identified
982  *
983  *	Determine from taskfile register contents whether a device is
984  *	ATA or ATAPI, as per "Signature and persistence" section
985  *	of ATA/PI spec (volume 1, sect 5.14).
986  *
987  *	LOCKING:
988  *	None.
989  *
990  *	RETURNS:
991  *	Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP,
992  *	%ATA_DEV_ZAC, or %ATA_DEV_UNKNOWN the event of failure.
993  */
ata_dev_classify(const struct ata_taskfile * tf)994 unsigned int ata_dev_classify(const struct ata_taskfile *tf)
995 {
996 	/* Apple's open source Darwin code hints that some devices only
997 	 * put a proper signature into the LBA mid/high registers,
998 	 * So, we only check those.  It's sufficient for uniqueness.
999 	 *
1000 	 * ATA/ATAPI-7 (d1532v1r1: Feb. 19, 2003) specified separate
1001 	 * signatures for ATA and ATAPI devices attached on SerialATA,
1002 	 * 0x3c/0xc3 and 0x69/0x96 respectively.  However, SerialATA
1003 	 * spec has never mentioned about using different signatures
1004 	 * for ATA/ATAPI devices.  Then, Serial ATA II: Port
1005 	 * Multiplier specification began to use 0x69/0x96 to identify
1006 	 * port multpliers and 0x3c/0xc3 to identify SEMB device.
1007 	 * ATA/ATAPI-7 dropped descriptions about 0x3c/0xc3 and
1008 	 * 0x69/0x96 shortly and described them as reserved for
1009 	 * SerialATA.
1010 	 *
1011 	 * We follow the current spec and consider that 0x69/0x96
1012 	 * identifies a port multiplier and 0x3c/0xc3 a SEMB device.
1013 	 * Unfortunately, WDC WD1600JS-62MHB5 (a hard drive) reports
1014 	 * SEMB signature.  This is worked around in
1015 	 * ata_dev_read_id().
1016 	 */
1017 	if (tf->lbam == 0 && tf->lbah == 0)
1018 		return ATA_DEV_ATA;
1019 
1020 	if (tf->lbam == 0x14 && tf->lbah == 0xeb)
1021 		return ATA_DEV_ATAPI;
1022 
1023 	if (tf->lbam == 0x69 && tf->lbah == 0x96)
1024 		return ATA_DEV_PMP;
1025 
1026 	if (tf->lbam == 0x3c && tf->lbah == 0xc3)
1027 		return ATA_DEV_SEMB;
1028 
1029 	if (tf->lbam == 0xcd && tf->lbah == 0xab)
1030 		return ATA_DEV_ZAC;
1031 
1032 	return ATA_DEV_UNKNOWN;
1033 }
1034 EXPORT_SYMBOL_GPL(ata_dev_classify);
1035 
1036 /**
1037  *	ata_id_string - Convert IDENTIFY DEVICE page into string
1038  *	@id: IDENTIFY DEVICE results we will examine
1039  *	@s: string into which data is output
1040  *	@ofs: offset into identify device page
1041  *	@len: length of string to return. must be an even number.
1042  *
1043  *	The strings in the IDENTIFY DEVICE page are broken up into
1044  *	16-bit chunks.  Run through the string, and output each
1045  *	8-bit chunk linearly, regardless of platform.
1046  *
1047  *	LOCKING:
1048  *	caller.
1049  */
1050 
ata_id_string(const u16 * id,unsigned char * s,unsigned int ofs,unsigned int len)1051 void ata_id_string(const u16 *id, unsigned char *s,
1052 		   unsigned int ofs, unsigned int len)
1053 {
1054 	unsigned int c;
1055 
1056 	BUG_ON(len & 1);
1057 
1058 	while (len > 0) {
1059 		c = id[ofs] >> 8;
1060 		*s = c;
1061 		s++;
1062 
1063 		c = id[ofs] & 0xff;
1064 		*s = c;
1065 		s++;
1066 
1067 		ofs++;
1068 		len -= 2;
1069 	}
1070 }
1071 EXPORT_SYMBOL_GPL(ata_id_string);
1072 
1073 /**
1074  *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1075  *	@id: IDENTIFY DEVICE results we will examine
1076  *	@s: string into which data is output
1077  *	@ofs: offset into identify device page
1078  *	@len: length of string to return. must be an odd number.
1079  *
1080  *	This function is identical to ata_id_string except that it
1081  *	trims trailing spaces and terminates the resulting string with
1082  *	null.  @len must be actual maximum length (even number) + 1.
1083  *
1084  *	LOCKING:
1085  *	caller.
1086  */
ata_id_c_string(const u16 * id,unsigned char * s,unsigned int ofs,unsigned int len)1087 void ata_id_c_string(const u16 *id, unsigned char *s,
1088 		     unsigned int ofs, unsigned int len)
1089 {
1090 	unsigned char *p;
1091 
1092 	ata_id_string(id, s, ofs, len - 1);
1093 
1094 	p = s + strnlen(s, len - 1);
1095 	while (p > s && p[-1] == ' ')
1096 		p--;
1097 	*p = '\0';
1098 }
1099 EXPORT_SYMBOL_GPL(ata_id_c_string);
1100 
ata_id_n_sectors(const u16 * id)1101 static u64 ata_id_n_sectors(const u16 *id)
1102 {
1103 	if (ata_id_has_lba(id)) {
1104 		if (ata_id_has_lba48(id))
1105 			return ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
1106 		else
1107 			return ata_id_u32(id, ATA_ID_LBA_CAPACITY);
1108 	} else {
1109 		if (ata_id_current_chs_valid(id))
1110 			return id[ATA_ID_CUR_CYLS] * id[ATA_ID_CUR_HEADS] *
1111 			       id[ATA_ID_CUR_SECTORS];
1112 		else
1113 			return id[ATA_ID_CYLS] * id[ATA_ID_HEADS] *
1114 			       id[ATA_ID_SECTORS];
1115 	}
1116 }
1117 
ata_tf_to_lba48(const struct ata_taskfile * tf)1118 u64 ata_tf_to_lba48(const struct ata_taskfile *tf)
1119 {
1120 	u64 sectors = 0;
1121 
1122 	sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
1123 	sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
1124 	sectors |= ((u64)(tf->hob_lbal & 0xff)) << 24;
1125 	sectors |= (tf->lbah & 0xff) << 16;
1126 	sectors |= (tf->lbam & 0xff) << 8;
1127 	sectors |= (tf->lbal & 0xff);
1128 
1129 	return sectors;
1130 }
1131 
ata_tf_to_lba(const struct ata_taskfile * tf)1132 u64 ata_tf_to_lba(const struct ata_taskfile *tf)
1133 {
1134 	u64 sectors = 0;
1135 
1136 	sectors |= (tf->device & 0x0f) << 24;
1137 	sectors |= (tf->lbah & 0xff) << 16;
1138 	sectors |= (tf->lbam & 0xff) << 8;
1139 	sectors |= (tf->lbal & 0xff);
1140 
1141 	return sectors;
1142 }
1143 
1144 /**
1145  *	ata_read_native_max_address - Read native max address
1146  *	@dev: target device
1147  *	@max_sectors: out parameter for the result native max address
1148  *
1149  *	Perform an LBA48 or LBA28 native size query upon the device in
1150  *	question.
1151  *
1152  *	RETURNS:
1153  *	0 on success, -EACCES if command is aborted by the drive.
1154  *	-EIO on other errors.
1155  */
ata_read_native_max_address(struct ata_device * dev,u64 * max_sectors)1156 static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
1157 {
1158 	unsigned int err_mask;
1159 	struct ata_taskfile tf;
1160 	int lba48 = ata_id_has_lba48(dev->id);
1161 
1162 	ata_tf_init(dev, &tf);
1163 
1164 	/* always clear all address registers */
1165 	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1166 
1167 	if (lba48) {
1168 		tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
1169 		tf.flags |= ATA_TFLAG_LBA48;
1170 	} else
1171 		tf.command = ATA_CMD_READ_NATIVE_MAX;
1172 
1173 	tf.protocol = ATA_PROT_NODATA;
1174 	tf.device |= ATA_LBA;
1175 
1176 	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1177 	if (err_mask) {
1178 		ata_dev_warn(dev,
1179 			     "failed to read native max address (err_mask=0x%x)\n",
1180 			     err_mask);
1181 		if (err_mask == AC_ERR_DEV && (tf.error & ATA_ABORTED))
1182 			return -EACCES;
1183 		return -EIO;
1184 	}
1185 
1186 	if (lba48)
1187 		*max_sectors = ata_tf_to_lba48(&tf) + 1;
1188 	else
1189 		*max_sectors = ata_tf_to_lba(&tf) + 1;
1190 	if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1191 		(*max_sectors)--;
1192 	return 0;
1193 }
1194 
1195 /**
1196  *	ata_set_max_sectors - Set max sectors
1197  *	@dev: target device
1198  *	@new_sectors: new max sectors value to set for the device
1199  *
1200  *	Set max sectors of @dev to @new_sectors.
1201  *
1202  *	RETURNS:
1203  *	0 on success, -EACCES if command is aborted or denied (due to
1204  *	previous non-volatile SET_MAX) by the drive.  -EIO on other
1205  *	errors.
1206  */
ata_set_max_sectors(struct ata_device * dev,u64 new_sectors)1207 static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
1208 {
1209 	unsigned int err_mask;
1210 	struct ata_taskfile tf;
1211 	int lba48 = ata_id_has_lba48(dev->id);
1212 
1213 	new_sectors--;
1214 
1215 	ata_tf_init(dev, &tf);
1216 
1217 	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1218 
1219 	if (lba48) {
1220 		tf.command = ATA_CMD_SET_MAX_EXT;
1221 		tf.flags |= ATA_TFLAG_LBA48;
1222 
1223 		tf.hob_lbal = (new_sectors >> 24) & 0xff;
1224 		tf.hob_lbam = (new_sectors >> 32) & 0xff;
1225 		tf.hob_lbah = (new_sectors >> 40) & 0xff;
1226 	} else {
1227 		tf.command = ATA_CMD_SET_MAX;
1228 
1229 		tf.device |= (new_sectors >> 24) & 0xf;
1230 	}
1231 
1232 	tf.protocol = ATA_PROT_NODATA;
1233 	tf.device |= ATA_LBA;
1234 
1235 	tf.lbal = (new_sectors >> 0) & 0xff;
1236 	tf.lbam = (new_sectors >> 8) & 0xff;
1237 	tf.lbah = (new_sectors >> 16) & 0xff;
1238 
1239 	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1240 	if (err_mask) {
1241 		ata_dev_warn(dev,
1242 			     "failed to set max address (err_mask=0x%x)\n",
1243 			     err_mask);
1244 		if (err_mask == AC_ERR_DEV &&
1245 		    (tf.error & (ATA_ABORTED | ATA_IDNF)))
1246 			return -EACCES;
1247 		return -EIO;
1248 	}
1249 
1250 	return 0;
1251 }
1252 
1253 /**
1254  *	ata_hpa_resize		-	Resize a device with an HPA set
1255  *	@dev: Device to resize
1256  *
1257  *	Read the size of an LBA28 or LBA48 disk with HPA features and resize
1258  *	it if required to the full size of the media. The caller must check
1259  *	the drive has the HPA feature set enabled.
1260  *
1261  *	RETURNS:
1262  *	0 on success, -errno on failure.
1263  */
ata_hpa_resize(struct ata_device * dev)1264 static int ata_hpa_resize(struct ata_device *dev)
1265 {
1266 	bool print_info = ata_dev_print_info(dev);
1267 	bool unlock_hpa = ata_ignore_hpa || dev->flags & ATA_DFLAG_UNLOCK_HPA;
1268 	u64 sectors = ata_id_n_sectors(dev->id);
1269 	u64 native_sectors;
1270 	int rc;
1271 
1272 	/* do we need to do it? */
1273 	if ((dev->class != ATA_DEV_ATA && dev->class != ATA_DEV_ZAC) ||
1274 	    !ata_id_has_lba(dev->id) || !ata_id_hpa_enabled(dev->id) ||
1275 	    (dev->horkage & ATA_HORKAGE_BROKEN_HPA))
1276 		return 0;
1277 
1278 	/* read native max address */
1279 	rc = ata_read_native_max_address(dev, &native_sectors);
1280 	if (rc) {
1281 		/* If device aborted the command or HPA isn't going to
1282 		 * be unlocked, skip HPA resizing.
1283 		 */
1284 		if (rc == -EACCES || !unlock_hpa) {
1285 			ata_dev_warn(dev,
1286 				     "HPA support seems broken, skipping HPA handling\n");
1287 			dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1288 
1289 			/* we can continue if device aborted the command */
1290 			if (rc == -EACCES)
1291 				rc = 0;
1292 		}
1293 
1294 		return rc;
1295 	}
1296 	dev->n_native_sectors = native_sectors;
1297 
1298 	/* nothing to do? */
1299 	if (native_sectors <= sectors || !unlock_hpa) {
1300 		if (!print_info || native_sectors == sectors)
1301 			return 0;
1302 
1303 		if (native_sectors > sectors)
1304 			ata_dev_info(dev,
1305 				"HPA detected: current %llu, native %llu\n",
1306 				(unsigned long long)sectors,
1307 				(unsigned long long)native_sectors);
1308 		else if (native_sectors < sectors)
1309 			ata_dev_warn(dev,
1310 				"native sectors (%llu) is smaller than sectors (%llu)\n",
1311 				(unsigned long long)native_sectors,
1312 				(unsigned long long)sectors);
1313 		return 0;
1314 	}
1315 
1316 	/* let's unlock HPA */
1317 	rc = ata_set_max_sectors(dev, native_sectors);
1318 	if (rc == -EACCES) {
1319 		/* if device aborted the command, skip HPA resizing */
1320 		ata_dev_warn(dev,
1321 			     "device aborted resize (%llu -> %llu), skipping HPA handling\n",
1322 			     (unsigned long long)sectors,
1323 			     (unsigned long long)native_sectors);
1324 		dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
1325 		return 0;
1326 	} else if (rc)
1327 		return rc;
1328 
1329 	/* re-read IDENTIFY data */
1330 	rc = ata_dev_reread_id(dev, 0);
1331 	if (rc) {
1332 		ata_dev_err(dev,
1333 			    "failed to re-read IDENTIFY data after HPA resizing\n");
1334 		return rc;
1335 	}
1336 
1337 	if (print_info) {
1338 		u64 new_sectors = ata_id_n_sectors(dev->id);
1339 		ata_dev_info(dev,
1340 			"HPA unlocked: %llu -> %llu, native %llu\n",
1341 			(unsigned long long)sectors,
1342 			(unsigned long long)new_sectors,
1343 			(unsigned long long)native_sectors);
1344 	}
1345 
1346 	return 0;
1347 }
1348 
1349 /**
1350  *	ata_dump_id - IDENTIFY DEVICE info debugging output
1351  *	@dev: device from which the information is fetched
1352  *	@id: IDENTIFY DEVICE page to dump
1353  *
1354  *	Dump selected 16-bit words from the given IDENTIFY DEVICE
1355  *	page.
1356  *
1357  *	LOCKING:
1358  *	caller.
1359  */
1360 
ata_dump_id(struct ata_device * dev,const u16 * id)1361 static inline void ata_dump_id(struct ata_device *dev, const u16 *id)
1362 {
1363 	ata_dev_dbg(dev,
1364 		"49==0x%04x  53==0x%04x  63==0x%04x  64==0x%04x  75==0x%04x\n"
1365 		"80==0x%04x  81==0x%04x  82==0x%04x  83==0x%04x  84==0x%04x\n"
1366 		"88==0x%04x  93==0x%04x\n",
1367 		id[49], id[53], id[63], id[64], id[75], id[80],
1368 		id[81], id[82], id[83], id[84], id[88], id[93]);
1369 }
1370 
1371 /**
1372  *	ata_id_xfermask - Compute xfermask from the given IDENTIFY data
1373  *	@id: IDENTIFY data to compute xfer mask from
1374  *
1375  *	Compute the xfermask for this device. This is not as trivial
1376  *	as it seems if we must consider early devices correctly.
1377  *
1378  *	FIXME: pre IDE drive timing (do we care ?).
1379  *
1380  *	LOCKING:
1381  *	None.
1382  *
1383  *	RETURNS:
1384  *	Computed xfermask
1385  */
ata_id_xfermask(const u16 * id)1386 unsigned long ata_id_xfermask(const u16 *id)
1387 {
1388 	unsigned long pio_mask, mwdma_mask, udma_mask;
1389 
1390 	/* Usual case. Word 53 indicates word 64 is valid */
1391 	if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
1392 		pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
1393 		pio_mask <<= 3;
1394 		pio_mask |= 0x7;
1395 	} else {
1396 		/* If word 64 isn't valid then Word 51 high byte holds
1397 		 * the PIO timing number for the maximum. Turn it into
1398 		 * a mask.
1399 		 */
1400 		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1401 		if (mode < 5)	/* Valid PIO range */
1402 			pio_mask = (2 << mode) - 1;
1403 		else
1404 			pio_mask = 1;
1405 
1406 		/* But wait.. there's more. Design your standards by
1407 		 * committee and you too can get a free iordy field to
1408 		 * process. However it is the speeds not the modes that
1409 		 * are supported... Note drivers using the timing API
1410 		 * will get this right anyway
1411 		 */
1412 	}
1413 
1414 	mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1415 
1416 	if (ata_id_is_cfa(id)) {
1417 		/*
1418 		 *	Process compact flash extended modes
1419 		 */
1420 		int pio = (id[ATA_ID_CFA_MODES] >> 0) & 0x7;
1421 		int dma = (id[ATA_ID_CFA_MODES] >> 3) & 0x7;
1422 
1423 		if (pio)
1424 			pio_mask |= (1 << 5);
1425 		if (pio > 1)
1426 			pio_mask |= (1 << 6);
1427 		if (dma)
1428 			mwdma_mask |= (1 << 3);
1429 		if (dma > 1)
1430 			mwdma_mask |= (1 << 4);
1431 	}
1432 
1433 	udma_mask = 0;
1434 	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
1435 		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1436 
1437 	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
1438 }
1439 EXPORT_SYMBOL_GPL(ata_id_xfermask);
1440 
ata_qc_complete_internal(struct ata_queued_cmd * qc)1441 static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1442 {
1443 	struct completion *waiting = qc->private_data;
1444 
1445 	complete(waiting);
1446 }
1447 
1448 /**
1449  *	ata_exec_internal_sg - execute libata internal command
1450  *	@dev: Device to which the command is sent
1451  *	@tf: Taskfile registers for the command and the result
1452  *	@cdb: CDB for packet command
1453  *	@dma_dir: Data transfer direction of the command
1454  *	@sgl: sg list for the data buffer of the command
1455  *	@n_elem: Number of sg entries
1456  *	@timeout: Timeout in msecs (0 for default)
1457  *
1458  *	Executes libata internal command with timeout.  @tf contains
1459  *	command on entry and result on return.  Timeout and error
1460  *	conditions are reported via return value.  No recovery action
1461  *	is taken after a command times out.  It's caller's duty to
1462  *	clean up after timeout.
1463  *
1464  *	LOCKING:
1465  *	None.  Should be called with kernel context, might sleep.
1466  *
1467  *	RETURNS:
1468  *	Zero on success, AC_ERR_* mask on failure
1469  */
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)1470 unsigned ata_exec_internal_sg(struct ata_device *dev,
1471 			      struct ata_taskfile *tf, const u8 *cdb,
1472 			      int dma_dir, struct scatterlist *sgl,
1473 			      unsigned int n_elem, unsigned long timeout)
1474 {
1475 	struct ata_link *link = dev->link;
1476 	struct ata_port *ap = link->ap;
1477 	u8 command = tf->command;
1478 	int auto_timeout = 0;
1479 	struct ata_queued_cmd *qc;
1480 	unsigned int preempted_tag;
1481 	u32 preempted_sactive;
1482 	u64 preempted_qc_active;
1483 	int preempted_nr_active_links;
1484 	DECLARE_COMPLETION_ONSTACK(wait);
1485 	unsigned long flags;
1486 	unsigned int err_mask;
1487 	int rc;
1488 
1489 	spin_lock_irqsave(ap->lock, flags);
1490 
1491 	/* no internal command while frozen */
1492 	if (ap->pflags & ATA_PFLAG_FROZEN) {
1493 		spin_unlock_irqrestore(ap->lock, flags);
1494 		return AC_ERR_SYSTEM;
1495 	}
1496 
1497 	/* initialize internal qc */
1498 	qc = __ata_qc_from_tag(ap, ATA_TAG_INTERNAL);
1499 
1500 	qc->tag = ATA_TAG_INTERNAL;
1501 	qc->hw_tag = 0;
1502 	qc->scsicmd = NULL;
1503 	qc->ap = ap;
1504 	qc->dev = dev;
1505 	ata_qc_reinit(qc);
1506 
1507 	preempted_tag = link->active_tag;
1508 	preempted_sactive = link->sactive;
1509 	preempted_qc_active = ap->qc_active;
1510 	preempted_nr_active_links = ap->nr_active_links;
1511 	link->active_tag = ATA_TAG_POISON;
1512 	link->sactive = 0;
1513 	ap->qc_active = 0;
1514 	ap->nr_active_links = 0;
1515 
1516 	/* prepare & issue qc */
1517 	qc->tf = *tf;
1518 	if (cdb)
1519 		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1520 
1521 	/* some SATA bridges need us to indicate data xfer direction */
1522 	if (tf->protocol == ATAPI_PROT_DMA && (dev->flags & ATA_DFLAG_DMADIR) &&
1523 	    dma_dir == DMA_FROM_DEVICE)
1524 		qc->tf.feature |= ATAPI_DMADIR;
1525 
1526 	qc->flags |= ATA_QCFLAG_RESULT_TF;
1527 	qc->dma_dir = dma_dir;
1528 	if (dma_dir != DMA_NONE) {
1529 		unsigned int i, buflen = 0;
1530 		struct scatterlist *sg;
1531 
1532 		for_each_sg(sgl, sg, n_elem, i)
1533 			buflen += sg->length;
1534 
1535 		ata_sg_init(qc, sgl, n_elem);
1536 		qc->nbytes = buflen;
1537 	}
1538 
1539 	qc->private_data = &wait;
1540 	qc->complete_fn = ata_qc_complete_internal;
1541 
1542 	ata_qc_issue(qc);
1543 
1544 	spin_unlock_irqrestore(ap->lock, flags);
1545 
1546 	if (!timeout) {
1547 		if (ata_probe_timeout)
1548 			timeout = ata_probe_timeout * 1000;
1549 		else {
1550 			timeout = ata_internal_cmd_timeout(dev, command);
1551 			auto_timeout = 1;
1552 		}
1553 	}
1554 
1555 	if (ap->ops->error_handler)
1556 		ata_eh_release(ap);
1557 
1558 	rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1559 
1560 	if (ap->ops->error_handler)
1561 		ata_eh_acquire(ap);
1562 
1563 	ata_sff_flush_pio_task(ap);
1564 
1565 	if (!rc) {
1566 		spin_lock_irqsave(ap->lock, flags);
1567 
1568 		/* We're racing with irq here.  If we lose, the
1569 		 * following test prevents us from completing the qc
1570 		 * twice.  If we win, the port is frozen and will be
1571 		 * cleaned up by ->post_internal_cmd().
1572 		 */
1573 		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1574 			qc->err_mask |= AC_ERR_TIMEOUT;
1575 
1576 			if (ap->ops->error_handler)
1577 				ata_port_freeze(ap);
1578 			else
1579 				ata_qc_complete(qc);
1580 
1581 			ata_dev_warn(dev, "qc timeout (cmd 0x%x)\n",
1582 				     command);
1583 		}
1584 
1585 		spin_unlock_irqrestore(ap->lock, flags);
1586 	}
1587 
1588 	/* do post_internal_cmd */
1589 	if (ap->ops->post_internal_cmd)
1590 		ap->ops->post_internal_cmd(qc);
1591 
1592 	/* perform minimal error analysis */
1593 	if (qc->flags & ATA_QCFLAG_FAILED) {
1594 		if (qc->result_tf.status & (ATA_ERR | ATA_DF))
1595 			qc->err_mask |= AC_ERR_DEV;
1596 
1597 		if (!qc->err_mask)
1598 			qc->err_mask |= AC_ERR_OTHER;
1599 
1600 		if (qc->err_mask & ~AC_ERR_OTHER)
1601 			qc->err_mask &= ~AC_ERR_OTHER;
1602 	} else if (qc->tf.command == ATA_CMD_REQ_SENSE_DATA) {
1603 		qc->result_tf.status |= ATA_SENSE;
1604 	}
1605 
1606 	/* finish up */
1607 	spin_lock_irqsave(ap->lock, flags);
1608 
1609 	*tf = qc->result_tf;
1610 	err_mask = qc->err_mask;
1611 
1612 	ata_qc_free(qc);
1613 	link->active_tag = preempted_tag;
1614 	link->sactive = preempted_sactive;
1615 	ap->qc_active = preempted_qc_active;
1616 	ap->nr_active_links = preempted_nr_active_links;
1617 
1618 	spin_unlock_irqrestore(ap->lock, flags);
1619 
1620 	if ((err_mask & AC_ERR_TIMEOUT) && auto_timeout)
1621 		ata_internal_cmd_timed_out(dev, command);
1622 
1623 	return err_mask;
1624 }
1625 
1626 /**
1627  *	ata_exec_internal - execute libata internal command
1628  *	@dev: Device to which the command is sent
1629  *	@tf: Taskfile registers for the command and the result
1630  *	@cdb: CDB for packet command
1631  *	@dma_dir: Data transfer direction of the command
1632  *	@buf: Data buffer of the command
1633  *	@buflen: Length of data buffer
1634  *	@timeout: Timeout in msecs (0 for default)
1635  *
1636  *	Wrapper around ata_exec_internal_sg() which takes simple
1637  *	buffer instead of sg list.
1638  *
1639  *	LOCKING:
1640  *	None.  Should be called with kernel context, might sleep.
1641  *
1642  *	RETURNS:
1643  *	Zero on success, AC_ERR_* mask on failure
1644  */
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)1645 unsigned ata_exec_internal(struct ata_device *dev,
1646 			   struct ata_taskfile *tf, const u8 *cdb,
1647 			   int dma_dir, void *buf, unsigned int buflen,
1648 			   unsigned long timeout)
1649 {
1650 	struct scatterlist *psg = NULL, sg;
1651 	unsigned int n_elem = 0;
1652 
1653 	if (dma_dir != DMA_NONE) {
1654 		WARN_ON(!buf);
1655 		sg_init_one(&sg, buf, buflen);
1656 		psg = &sg;
1657 		n_elem++;
1658 	}
1659 
1660 	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
1661 				    timeout);
1662 }
1663 
1664 /**
1665  *	ata_pio_need_iordy	-	check if iordy needed
1666  *	@adev: ATA device
1667  *
1668  *	Check if the current speed of the device requires IORDY. Used
1669  *	by various controllers for chip configuration.
1670  */
ata_pio_need_iordy(const struct ata_device * adev)1671 unsigned int ata_pio_need_iordy(const struct ata_device *adev)
1672 {
1673 	/* Don't set IORDY if we're preparing for reset.  IORDY may
1674 	 * lead to controller lock up on certain controllers if the
1675 	 * port is not occupied.  See bko#11703 for details.
1676 	 */
1677 	if (adev->link->ap->pflags & ATA_PFLAG_RESETTING)
1678 		return 0;
1679 	/* Controller doesn't support IORDY.  Probably a pointless
1680 	 * check as the caller should know this.
1681 	 */
1682 	if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1683 		return 0;
1684 	/* CF spec. r4.1 Table 22 says no iordy on PIO5 and PIO6.  */
1685 	if (ata_id_is_cfa(adev->id)
1686 	    && (adev->pio_mode == XFER_PIO_5 || adev->pio_mode == XFER_PIO_6))
1687 		return 0;
1688 	/* PIO3 and higher it is mandatory */
1689 	if (adev->pio_mode > XFER_PIO_2)
1690 		return 1;
1691 	/* We turn it on when possible */
1692 	if (ata_id_has_iordy(adev->id))
1693 		return 1;
1694 	return 0;
1695 }
1696 EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
1697 
1698 /**
1699  *	ata_pio_mask_no_iordy	-	Return the non IORDY mask
1700  *	@adev: ATA device
1701  *
1702  *	Compute the highest mode possible if we are not using iordy. Return
1703  *	-1 if no iordy mode is available.
1704  */
ata_pio_mask_no_iordy(const struct ata_device * adev)1705 static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
1706 {
1707 	/* If we have no drive specific rule, then PIO 2 is non IORDY */
1708 	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE */
1709 		u16 pio = adev->id[ATA_ID_EIDE_PIO];
1710 		/* Is the speed faster than the drive allows non IORDY ? */
1711 		if (pio) {
1712 			/* This is cycle times not frequency - watch the logic! */
1713 			if (pio > 240)	/* PIO2 is 240nS per cycle */
1714 				return 3 << ATA_SHIFT_PIO;
1715 			return 7 << ATA_SHIFT_PIO;
1716 		}
1717 	}
1718 	return 3 << ATA_SHIFT_PIO;
1719 }
1720 
1721 /**
1722  *	ata_do_dev_read_id		-	default ID read method
1723  *	@dev: device
1724  *	@tf: proposed taskfile
1725  *	@id: data buffer
1726  *
1727  *	Issue the identify taskfile and hand back the buffer containing
1728  *	identify data. For some RAID controllers and for pre ATA devices
1729  *	this function is wrapped or replaced by the driver
1730  */
ata_do_dev_read_id(struct ata_device * dev,struct ata_taskfile * tf,__le16 * id)1731 unsigned int ata_do_dev_read_id(struct ata_device *dev,
1732 				struct ata_taskfile *tf, __le16 *id)
1733 {
1734 	return ata_exec_internal(dev, tf, NULL, DMA_FROM_DEVICE,
1735 				     id, sizeof(id[0]) * ATA_ID_WORDS, 0);
1736 }
1737 EXPORT_SYMBOL_GPL(ata_do_dev_read_id);
1738 
1739 /**
1740  *	ata_dev_read_id - Read ID data from the specified device
1741  *	@dev: target device
1742  *	@p_class: pointer to class of the target device (may be changed)
1743  *	@flags: ATA_READID_* flags
1744  *	@id: buffer to read IDENTIFY data into
1745  *
1746  *	Read ID data from the specified device.  ATA_CMD_ID_ATA is
1747  *	performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
1748  *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
1749  *	for pre-ATA4 drives.
1750  *
1751  *	FIXME: ATA_CMD_ID_ATA is optional for early drives and right
1752  *	now we abort if we hit that case.
1753  *
1754  *	LOCKING:
1755  *	Kernel thread context (may sleep)
1756  *
1757  *	RETURNS:
1758  *	0 on success, -errno otherwise.
1759  */
ata_dev_read_id(struct ata_device * dev,unsigned int * p_class,unsigned int flags,u16 * id)1760 int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1761 		    unsigned int flags, u16 *id)
1762 {
1763 	struct ata_port *ap = dev->link->ap;
1764 	unsigned int class = *p_class;
1765 	struct ata_taskfile tf;
1766 	unsigned int err_mask = 0;
1767 	const char *reason;
1768 	bool is_semb = class == ATA_DEV_SEMB;
1769 	int may_fallback = 1, tried_spinup = 0;
1770 	int rc;
1771 
1772 retry:
1773 	ata_tf_init(dev, &tf);
1774 
1775 	switch (class) {
1776 	case ATA_DEV_SEMB:
1777 		class = ATA_DEV_ATA;	/* some hard drives report SEMB sig */
1778 		fallthrough;
1779 	case ATA_DEV_ATA:
1780 	case ATA_DEV_ZAC:
1781 		tf.command = ATA_CMD_ID_ATA;
1782 		break;
1783 	case ATA_DEV_ATAPI:
1784 		tf.command = ATA_CMD_ID_ATAPI;
1785 		break;
1786 	default:
1787 		rc = -ENODEV;
1788 		reason = "unsupported class";
1789 		goto err_out;
1790 	}
1791 
1792 	tf.protocol = ATA_PROT_PIO;
1793 
1794 	/* Some devices choke if TF registers contain garbage.  Make
1795 	 * sure those are properly initialized.
1796 	 */
1797 	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1798 
1799 	/* Device presence detection is unreliable on some
1800 	 * controllers.  Always poll IDENTIFY if available.
1801 	 */
1802 	tf.flags |= ATA_TFLAG_POLLING;
1803 
1804 	if (ap->ops->read_id)
1805 		err_mask = ap->ops->read_id(dev, &tf, (__le16 *)id);
1806 	else
1807 		err_mask = ata_do_dev_read_id(dev, &tf, (__le16 *)id);
1808 
1809 	if (err_mask) {
1810 		if (err_mask & AC_ERR_NODEV_HINT) {
1811 			ata_dev_dbg(dev, "NODEV after polling detection\n");
1812 			return -ENOENT;
1813 		}
1814 
1815 		if (is_semb) {
1816 			ata_dev_info(dev,
1817 		     "IDENTIFY failed on device w/ SEMB sig, disabled\n");
1818 			/* SEMB is not supported yet */
1819 			*p_class = ATA_DEV_SEMB_UNSUP;
1820 			return 0;
1821 		}
1822 
1823 		if ((err_mask == AC_ERR_DEV) && (tf.error & ATA_ABORTED)) {
1824 			/* Device or controller might have reported
1825 			 * the wrong device class.  Give a shot at the
1826 			 * other IDENTIFY if the current one is
1827 			 * aborted by the device.
1828 			 */
1829 			if (may_fallback) {
1830 				may_fallback = 0;
1831 
1832 				if (class == ATA_DEV_ATA)
1833 					class = ATA_DEV_ATAPI;
1834 				else
1835 					class = ATA_DEV_ATA;
1836 				goto retry;
1837 			}
1838 
1839 			/* Control reaches here iff the device aborted
1840 			 * both flavors of IDENTIFYs which happens
1841 			 * sometimes with phantom devices.
1842 			 */
1843 			ata_dev_dbg(dev,
1844 				    "both IDENTIFYs aborted, assuming NODEV\n");
1845 			return -ENOENT;
1846 		}
1847 
1848 		rc = -EIO;
1849 		reason = "I/O error";
1850 		goto err_out;
1851 	}
1852 
1853 	if (dev->horkage & ATA_HORKAGE_DUMP_ID) {
1854 		ata_dev_info(dev, "dumping IDENTIFY data, "
1855 			    "class=%d may_fallback=%d tried_spinup=%d\n",
1856 			    class, may_fallback, tried_spinup);
1857 		print_hex_dump(KERN_INFO, "", DUMP_PREFIX_OFFSET,
1858 			       16, 2, id, ATA_ID_WORDS * sizeof(*id), true);
1859 	}
1860 
1861 	/* Falling back doesn't make sense if ID data was read
1862 	 * successfully at least once.
1863 	 */
1864 	may_fallback = 0;
1865 
1866 	swap_buf_le16(id, ATA_ID_WORDS);
1867 
1868 	/* sanity check */
1869 	rc = -EINVAL;
1870 	reason = "device reports invalid type";
1871 
1872 	if (class == ATA_DEV_ATA || class == ATA_DEV_ZAC) {
1873 		if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
1874 			goto err_out;
1875 		if (ap->host->flags & ATA_HOST_IGNORE_ATA &&
1876 							ata_id_is_ata(id)) {
1877 			ata_dev_dbg(dev,
1878 				"host indicates ignore ATA devices, ignored\n");
1879 			return -ENOENT;
1880 		}
1881 	} else {
1882 		if (ata_id_is_ata(id))
1883 			goto err_out;
1884 	}
1885 
1886 	if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) {
1887 		tried_spinup = 1;
1888 		/*
1889 		 * Drive powered-up in standby mode, and requires a specific
1890 		 * SET_FEATURES spin-up subcommand before it will accept
1891 		 * anything other than the original IDENTIFY command.
1892 		 */
1893 		err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
1894 		if (err_mask && id[2] != 0x738c) {
1895 			rc = -EIO;
1896 			reason = "SPINUP failed";
1897 			goto err_out;
1898 		}
1899 		/*
1900 		 * If the drive initially returned incomplete IDENTIFY info,
1901 		 * we now must reissue the IDENTIFY command.
1902 		 */
1903 		if (id[2] == 0x37c8)
1904 			goto retry;
1905 	}
1906 
1907 	if ((flags & ATA_READID_POSTRESET) &&
1908 	    (class == ATA_DEV_ATA || class == ATA_DEV_ZAC)) {
1909 		/*
1910 		 * The exact sequence expected by certain pre-ATA4 drives is:
1911 		 * SRST RESET
1912 		 * IDENTIFY (optional in early ATA)
1913 		 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
1914 		 * anything else..
1915 		 * Some drives were very specific about that exact sequence.
1916 		 *
1917 		 * Note that ATA4 says lba is mandatory so the second check
1918 		 * should never trigger.
1919 		 */
1920 		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
1921 			err_mask = ata_dev_init_params(dev, id[3], id[6]);
1922 			if (err_mask) {
1923 				rc = -EIO;
1924 				reason = "INIT_DEV_PARAMS failed";
1925 				goto err_out;
1926 			}
1927 
1928 			/* current CHS translation info (id[53-58]) might be
1929 			 * changed. reread the identify device info.
1930 			 */
1931 			flags &= ~ATA_READID_POSTRESET;
1932 			goto retry;
1933 		}
1934 	}
1935 
1936 	*p_class = class;
1937 
1938 	return 0;
1939 
1940  err_out:
1941 	ata_dev_warn(dev, "failed to IDENTIFY (%s, err_mask=0x%x)\n",
1942 		     reason, err_mask);
1943 	return rc;
1944 }
1945 
1946 /**
1947  *	ata_read_log_page - read a specific log page
1948  *	@dev: target device
1949  *	@log: log to read
1950  *	@page: page to read
1951  *	@buf: buffer to store read page
1952  *	@sectors: number of sectors to read
1953  *
1954  *	Read log page using READ_LOG_EXT command.
1955  *
1956  *	LOCKING:
1957  *	Kernel thread context (may sleep).
1958  *
1959  *	RETURNS:
1960  *	0 on success, AC_ERR_* mask otherwise.
1961  */
ata_read_log_page(struct ata_device * dev,u8 log,u8 page,void * buf,unsigned int sectors)1962 unsigned int ata_read_log_page(struct ata_device *dev, u8 log,
1963 			       u8 page, void *buf, unsigned int sectors)
1964 {
1965 	unsigned long ap_flags = dev->link->ap->flags;
1966 	struct ata_taskfile tf;
1967 	unsigned int err_mask;
1968 	bool dma = false;
1969 
1970 	ata_dev_dbg(dev, "read log page - log 0x%x, page 0x%x\n", log, page);
1971 
1972 	/*
1973 	 * Return error without actually issuing the command on controllers
1974 	 * which e.g. lockup on a read log page.
1975 	 */
1976 	if (ap_flags & ATA_FLAG_NO_LOG_PAGE)
1977 		return AC_ERR_DEV;
1978 
1979 retry:
1980 	ata_tf_init(dev, &tf);
1981 	if (ata_dma_enabled(dev) && ata_id_has_read_log_dma_ext(dev->id) &&
1982 	    !(dev->horkage & ATA_HORKAGE_NO_DMA_LOG)) {
1983 		tf.command = ATA_CMD_READ_LOG_DMA_EXT;
1984 		tf.protocol = ATA_PROT_DMA;
1985 		dma = true;
1986 	} else {
1987 		tf.command = ATA_CMD_READ_LOG_EXT;
1988 		tf.protocol = ATA_PROT_PIO;
1989 		dma = false;
1990 	}
1991 	tf.lbal = log;
1992 	tf.lbam = page;
1993 	tf.nsect = sectors;
1994 	tf.hob_nsect = sectors >> 8;
1995 	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_LBA48 | ATA_TFLAG_DEVICE;
1996 
1997 	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
1998 				     buf, sectors * ATA_SECT_SIZE, 0);
1999 
2000 	if (err_mask) {
2001 		if (dma) {
2002 			dev->horkage |= ATA_HORKAGE_NO_DMA_LOG;
2003 			goto retry;
2004 		}
2005 		ata_dev_err(dev,
2006 			    "Read log 0x%02x page 0x%02x failed, Emask 0x%x\n",
2007 			    (unsigned int)log, (unsigned int)page, err_mask);
2008 	}
2009 
2010 	return err_mask;
2011 }
2012 
ata_log_supported(struct ata_device * dev,u8 log)2013 static int ata_log_supported(struct ata_device *dev, u8 log)
2014 {
2015 	struct ata_port *ap = dev->link->ap;
2016 
2017 	if (dev->horkage & ATA_HORKAGE_NO_LOG_DIR)
2018 		return 0;
2019 
2020 	if (ata_read_log_page(dev, ATA_LOG_DIRECTORY, 0, ap->sector_buf, 1))
2021 		return 0;
2022 	return get_unaligned_le16(&ap->sector_buf[log * 2]);
2023 }
2024 
ata_identify_page_supported(struct ata_device * dev,u8 page)2025 static bool ata_identify_page_supported(struct ata_device *dev, u8 page)
2026 {
2027 	struct ata_port *ap = dev->link->ap;
2028 	unsigned int err, i;
2029 
2030 	if (dev->horkage & ATA_HORKAGE_NO_ID_DEV_LOG)
2031 		return false;
2032 
2033 	if (!ata_log_supported(dev, ATA_LOG_IDENTIFY_DEVICE)) {
2034 		/*
2035 		 * IDENTIFY DEVICE data log is defined as mandatory starting
2036 		 * with ACS-3 (ATA version 10). Warn about the missing log
2037 		 * for drives which implement this ATA level or above.
2038 		 */
2039 		if (ata_id_major_version(dev->id) >= 10)
2040 			ata_dev_warn(dev,
2041 				"ATA Identify Device Log not supported\n");
2042 		dev->horkage |= ATA_HORKAGE_NO_ID_DEV_LOG;
2043 		return false;
2044 	}
2045 
2046 	/*
2047 	 * Read IDENTIFY DEVICE data log, page 0, to figure out if the page is
2048 	 * supported.
2049 	 */
2050 	err = ata_read_log_page(dev, ATA_LOG_IDENTIFY_DEVICE, 0, ap->sector_buf,
2051 				1);
2052 	if (err)
2053 		return false;
2054 
2055 	for (i = 0; i < ap->sector_buf[8]; i++) {
2056 		if (ap->sector_buf[9 + i] == page)
2057 			return true;
2058 	}
2059 
2060 	return false;
2061 }
2062 
ata_do_link_spd_horkage(struct ata_device * dev)2063 static int ata_do_link_spd_horkage(struct ata_device *dev)
2064 {
2065 	struct ata_link *plink = ata_dev_phys_link(dev);
2066 	u32 target, target_limit;
2067 
2068 	if (!sata_scr_valid(plink))
2069 		return 0;
2070 
2071 	if (dev->horkage & ATA_HORKAGE_1_5_GBPS)
2072 		target = 1;
2073 	else
2074 		return 0;
2075 
2076 	target_limit = (1 << target) - 1;
2077 
2078 	/* if already on stricter limit, no need to push further */
2079 	if (plink->sata_spd_limit <= target_limit)
2080 		return 0;
2081 
2082 	plink->sata_spd_limit = target_limit;
2083 
2084 	/* Request another EH round by returning -EAGAIN if link is
2085 	 * going faster than the target speed.  Forward progress is
2086 	 * guaranteed by setting sata_spd_limit to target_limit above.
2087 	 */
2088 	if (plink->sata_spd > target) {
2089 		ata_dev_info(dev, "applying link speed limit horkage to %s\n",
2090 			     sata_spd_string(target));
2091 		return -EAGAIN;
2092 	}
2093 	return 0;
2094 }
2095 
ata_dev_knobble(struct ata_device * dev)2096 static inline u8 ata_dev_knobble(struct ata_device *dev)
2097 {
2098 	struct ata_port *ap = dev->link->ap;
2099 
2100 	if (ata_dev_blacklisted(dev) & ATA_HORKAGE_BRIDGE_OK)
2101 		return 0;
2102 
2103 	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2104 }
2105 
ata_dev_config_ncq_send_recv(struct ata_device * dev)2106 static void ata_dev_config_ncq_send_recv(struct ata_device *dev)
2107 {
2108 	struct ata_port *ap = dev->link->ap;
2109 	unsigned int err_mask;
2110 
2111 	if (!ata_log_supported(dev, ATA_LOG_NCQ_SEND_RECV)) {
2112 		ata_dev_warn(dev, "NCQ Send/Recv Log not supported\n");
2113 		return;
2114 	}
2115 	err_mask = ata_read_log_page(dev, ATA_LOG_NCQ_SEND_RECV,
2116 				     0, ap->sector_buf, 1);
2117 	if (!err_mask) {
2118 		u8 *cmds = dev->ncq_send_recv_cmds;
2119 
2120 		dev->flags |= ATA_DFLAG_NCQ_SEND_RECV;
2121 		memcpy(cmds, ap->sector_buf, ATA_LOG_NCQ_SEND_RECV_SIZE);
2122 
2123 		if (dev->horkage & ATA_HORKAGE_NO_NCQ_TRIM) {
2124 			ata_dev_dbg(dev, "disabling queued TRIM support\n");
2125 			cmds[ATA_LOG_NCQ_SEND_RECV_DSM_OFFSET] &=
2126 				~ATA_LOG_NCQ_SEND_RECV_DSM_TRIM;
2127 		}
2128 	}
2129 }
2130 
ata_dev_config_ncq_non_data(struct ata_device * dev)2131 static void ata_dev_config_ncq_non_data(struct ata_device *dev)
2132 {
2133 	struct ata_port *ap = dev->link->ap;
2134 	unsigned int err_mask;
2135 
2136 	if (!ata_log_supported(dev, ATA_LOG_NCQ_NON_DATA)) {
2137 		ata_dev_warn(dev,
2138 			     "NCQ Send/Recv Log not supported\n");
2139 		return;
2140 	}
2141 	err_mask = ata_read_log_page(dev, ATA_LOG_NCQ_NON_DATA,
2142 				     0, ap->sector_buf, 1);
2143 	if (!err_mask) {
2144 		u8 *cmds = dev->ncq_non_data_cmds;
2145 
2146 		memcpy(cmds, ap->sector_buf, ATA_LOG_NCQ_NON_DATA_SIZE);
2147 	}
2148 }
2149 
ata_dev_config_ncq_prio(struct ata_device * dev)2150 static void ata_dev_config_ncq_prio(struct ata_device *dev)
2151 {
2152 	struct ata_port *ap = dev->link->ap;
2153 	unsigned int err_mask;
2154 
2155 	if (!ata_identify_page_supported(dev, ATA_LOG_SATA_SETTINGS))
2156 		return;
2157 
2158 	err_mask = ata_read_log_page(dev,
2159 				     ATA_LOG_IDENTIFY_DEVICE,
2160 				     ATA_LOG_SATA_SETTINGS,
2161 				     ap->sector_buf,
2162 				     1);
2163 	if (err_mask)
2164 		goto not_supported;
2165 
2166 	if (!(ap->sector_buf[ATA_LOG_NCQ_PRIO_OFFSET] & BIT(3)))
2167 		goto not_supported;
2168 
2169 	dev->flags |= ATA_DFLAG_NCQ_PRIO;
2170 
2171 	return;
2172 
2173 not_supported:
2174 	dev->flags &= ~ATA_DFLAG_NCQ_PRIO_ENABLE;
2175 	dev->flags &= ~ATA_DFLAG_NCQ_PRIO;
2176 }
2177 
ata_dev_check_adapter(struct ata_device * dev,unsigned short vendor_id)2178 static bool ata_dev_check_adapter(struct ata_device *dev,
2179 				  unsigned short vendor_id)
2180 {
2181 	struct pci_dev *pcidev = NULL;
2182 	struct device *parent_dev = NULL;
2183 
2184 	for (parent_dev = dev->tdev.parent; parent_dev != NULL;
2185 	     parent_dev = parent_dev->parent) {
2186 		if (dev_is_pci(parent_dev)) {
2187 			pcidev = to_pci_dev(parent_dev);
2188 			if (pcidev->vendor == vendor_id)
2189 				return true;
2190 			break;
2191 		}
2192 	}
2193 
2194 	return false;
2195 }
2196 
ata_dev_config_ncq(struct ata_device * dev,char * desc,size_t desc_sz)2197 static int ata_dev_config_ncq(struct ata_device *dev,
2198 			       char *desc, size_t desc_sz)
2199 {
2200 	struct ata_port *ap = dev->link->ap;
2201 	int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
2202 	unsigned int err_mask;
2203 	char *aa_desc = "";
2204 
2205 	if (!ata_id_has_ncq(dev->id)) {
2206 		desc[0] = '\0';
2207 		return 0;
2208 	}
2209 	if (!IS_ENABLED(CONFIG_SATA_HOST))
2210 		return 0;
2211 	if (dev->horkage & ATA_HORKAGE_NONCQ) {
2212 		snprintf(desc, desc_sz, "NCQ (not used)");
2213 		return 0;
2214 	}
2215 
2216 	if (dev->horkage & ATA_HORKAGE_NO_NCQ_ON_ATI &&
2217 	    ata_dev_check_adapter(dev, PCI_VENDOR_ID_ATI)) {
2218 		snprintf(desc, desc_sz, "NCQ (not used)");
2219 		return 0;
2220 	}
2221 
2222 	if (ap->flags & ATA_FLAG_NCQ) {
2223 		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE);
2224 		dev->flags |= ATA_DFLAG_NCQ;
2225 	}
2226 
2227 	if (!(dev->horkage & ATA_HORKAGE_BROKEN_FPDMA_AA) &&
2228 		(ap->flags & ATA_FLAG_FPDMA_AA) &&
2229 		ata_id_has_fpdma_aa(dev->id)) {
2230 		err_mask = ata_dev_set_feature(dev, SETFEATURES_SATA_ENABLE,
2231 			SATA_FPDMA_AA);
2232 		if (err_mask) {
2233 			ata_dev_err(dev,
2234 				    "failed to enable AA (error_mask=0x%x)\n",
2235 				    err_mask);
2236 			if (err_mask != AC_ERR_DEV) {
2237 				dev->horkage |= ATA_HORKAGE_BROKEN_FPDMA_AA;
2238 				return -EIO;
2239 			}
2240 		} else
2241 			aa_desc = ", AA";
2242 	}
2243 
2244 	if (hdepth >= ddepth)
2245 		snprintf(desc, desc_sz, "NCQ (depth %d)%s", ddepth, aa_desc);
2246 	else
2247 		snprintf(desc, desc_sz, "NCQ (depth %d/%d)%s", hdepth,
2248 			ddepth, aa_desc);
2249 
2250 	if ((ap->flags & ATA_FLAG_FPDMA_AUX)) {
2251 		if (ata_id_has_ncq_send_and_recv(dev->id))
2252 			ata_dev_config_ncq_send_recv(dev);
2253 		if (ata_id_has_ncq_non_data(dev->id))
2254 			ata_dev_config_ncq_non_data(dev);
2255 		if (ata_id_has_ncq_prio(dev->id))
2256 			ata_dev_config_ncq_prio(dev);
2257 	}
2258 
2259 	return 0;
2260 }
2261 
ata_dev_config_sense_reporting(struct ata_device * dev)2262 static void ata_dev_config_sense_reporting(struct ata_device *dev)
2263 {
2264 	unsigned int err_mask;
2265 
2266 	if (!ata_id_has_sense_reporting(dev->id))
2267 		return;
2268 
2269 	if (ata_id_sense_reporting_enabled(dev->id))
2270 		return;
2271 
2272 	err_mask = ata_dev_set_feature(dev, SETFEATURE_SENSE_DATA, 0x1);
2273 	if (err_mask) {
2274 		ata_dev_dbg(dev,
2275 			    "failed to enable Sense Data Reporting, Emask 0x%x\n",
2276 			    err_mask);
2277 	}
2278 }
2279 
ata_dev_config_zac(struct ata_device * dev)2280 static void ata_dev_config_zac(struct ata_device *dev)
2281 {
2282 	struct ata_port *ap = dev->link->ap;
2283 	unsigned int err_mask;
2284 	u8 *identify_buf = ap->sector_buf;
2285 
2286 	dev->zac_zones_optimal_open = U32_MAX;
2287 	dev->zac_zones_optimal_nonseq = U32_MAX;
2288 	dev->zac_zones_max_open = U32_MAX;
2289 
2290 	/*
2291 	 * Always set the 'ZAC' flag for Host-managed devices.
2292 	 */
2293 	if (dev->class == ATA_DEV_ZAC)
2294 		dev->flags |= ATA_DFLAG_ZAC;
2295 	else if (ata_id_zoned_cap(dev->id) == 0x01)
2296 		/*
2297 		 * Check for host-aware devices.
2298 		 */
2299 		dev->flags |= ATA_DFLAG_ZAC;
2300 
2301 	if (!(dev->flags & ATA_DFLAG_ZAC))
2302 		return;
2303 
2304 	if (!ata_identify_page_supported(dev, ATA_LOG_ZONED_INFORMATION)) {
2305 		ata_dev_warn(dev,
2306 			     "ATA Zoned Information Log not supported\n");
2307 		return;
2308 	}
2309 
2310 	/*
2311 	 * Read IDENTIFY DEVICE data log, page 9 (Zoned-device information)
2312 	 */
2313 	err_mask = ata_read_log_page(dev, ATA_LOG_IDENTIFY_DEVICE,
2314 				     ATA_LOG_ZONED_INFORMATION,
2315 				     identify_buf, 1);
2316 	if (!err_mask) {
2317 		u64 zoned_cap, opt_open, opt_nonseq, max_open;
2318 
2319 		zoned_cap = get_unaligned_le64(&identify_buf[8]);
2320 		if ((zoned_cap >> 63))
2321 			dev->zac_zoned_cap = (zoned_cap & 1);
2322 		opt_open = get_unaligned_le64(&identify_buf[24]);
2323 		if ((opt_open >> 63))
2324 			dev->zac_zones_optimal_open = (u32)opt_open;
2325 		opt_nonseq = get_unaligned_le64(&identify_buf[32]);
2326 		if ((opt_nonseq >> 63))
2327 			dev->zac_zones_optimal_nonseq = (u32)opt_nonseq;
2328 		max_open = get_unaligned_le64(&identify_buf[40]);
2329 		if ((max_open >> 63))
2330 			dev->zac_zones_max_open = (u32)max_open;
2331 	}
2332 }
2333 
ata_dev_config_trusted(struct ata_device * dev)2334 static void ata_dev_config_trusted(struct ata_device *dev)
2335 {
2336 	struct ata_port *ap = dev->link->ap;
2337 	u64 trusted_cap;
2338 	unsigned int err;
2339 
2340 	if (!ata_id_has_trusted(dev->id))
2341 		return;
2342 
2343 	if (!ata_identify_page_supported(dev, ATA_LOG_SECURITY)) {
2344 		ata_dev_warn(dev,
2345 			     "Security Log not supported\n");
2346 		return;
2347 	}
2348 
2349 	err = ata_read_log_page(dev, ATA_LOG_IDENTIFY_DEVICE, ATA_LOG_SECURITY,
2350 			ap->sector_buf, 1);
2351 	if (err)
2352 		return;
2353 
2354 	trusted_cap = get_unaligned_le64(&ap->sector_buf[40]);
2355 	if (!(trusted_cap & (1ULL << 63))) {
2356 		ata_dev_dbg(dev,
2357 			    "Trusted Computing capability qword not valid!\n");
2358 		return;
2359 	}
2360 
2361 	if (trusted_cap & (1 << 0))
2362 		dev->flags |= ATA_DFLAG_TRUSTED;
2363 }
2364 
ata_dev_config_lba(struct ata_device * dev)2365 static int ata_dev_config_lba(struct ata_device *dev)
2366 {
2367 	const u16 *id = dev->id;
2368 	const char *lba_desc;
2369 	char ncq_desc[24];
2370 	int ret;
2371 
2372 	dev->flags |= ATA_DFLAG_LBA;
2373 
2374 	if (ata_id_has_lba48(id)) {
2375 		lba_desc = "LBA48";
2376 		dev->flags |= ATA_DFLAG_LBA48;
2377 		if (dev->n_sectors >= (1UL << 28) &&
2378 		    ata_id_has_flush_ext(id))
2379 			dev->flags |= ATA_DFLAG_FLUSH_EXT;
2380 	} else {
2381 		lba_desc = "LBA";
2382 	}
2383 
2384 	/* config NCQ */
2385 	ret = ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
2386 
2387 	/* print device info to dmesg */
2388 	if (ata_dev_print_info(dev))
2389 		ata_dev_info(dev,
2390 			     "%llu sectors, multi %u: %s %s\n",
2391 			     (unsigned long long)dev->n_sectors,
2392 			     dev->multi_count, lba_desc, ncq_desc);
2393 
2394 	return ret;
2395 }
2396 
ata_dev_config_chs(struct ata_device * dev)2397 static void ata_dev_config_chs(struct ata_device *dev)
2398 {
2399 	const u16 *id = dev->id;
2400 
2401 	if (ata_id_current_chs_valid(id)) {
2402 		/* Current CHS translation is valid. */
2403 		dev->cylinders = id[54];
2404 		dev->heads     = id[55];
2405 		dev->sectors   = id[56];
2406 	} else {
2407 		/* Default translation */
2408 		dev->cylinders	= id[1];
2409 		dev->heads	= id[3];
2410 		dev->sectors	= id[6];
2411 	}
2412 
2413 	/* print device info to dmesg */
2414 	if (ata_dev_print_info(dev))
2415 		ata_dev_info(dev,
2416 			     "%llu sectors, multi %u, CHS %u/%u/%u\n",
2417 			     (unsigned long long)dev->n_sectors,
2418 			     dev->multi_count, dev->cylinders,
2419 			     dev->heads, dev->sectors);
2420 }
2421 
ata_dev_config_devslp(struct ata_device * dev)2422 static void ata_dev_config_devslp(struct ata_device *dev)
2423 {
2424 	u8 *sata_setting = dev->link->ap->sector_buf;
2425 	unsigned int err_mask;
2426 	int i, j;
2427 
2428 	/*
2429 	 * Check device sleep capability. Get DevSlp timing variables
2430 	 * from SATA Settings page of Identify Device Data Log.
2431 	 */
2432 	if (!ata_id_has_devslp(dev->id) ||
2433 	    !ata_identify_page_supported(dev, ATA_LOG_SATA_SETTINGS))
2434 		return;
2435 
2436 	err_mask = ata_read_log_page(dev,
2437 				     ATA_LOG_IDENTIFY_DEVICE,
2438 				     ATA_LOG_SATA_SETTINGS,
2439 				     sata_setting, 1);
2440 	if (err_mask)
2441 		return;
2442 
2443 	dev->flags |= ATA_DFLAG_DEVSLP;
2444 	for (i = 0; i < ATA_LOG_DEVSLP_SIZE; i++) {
2445 		j = ATA_LOG_DEVSLP_OFFSET + i;
2446 		dev->devslp_timing[i] = sata_setting[j];
2447 	}
2448 }
2449 
ata_dev_config_cpr(struct ata_device * dev)2450 static void ata_dev_config_cpr(struct ata_device *dev)
2451 {
2452 	unsigned int err_mask;
2453 	size_t buf_len;
2454 	int i, nr_cpr = 0;
2455 	struct ata_cpr_log *cpr_log = NULL;
2456 	u8 *desc, *buf = NULL;
2457 
2458 	if (ata_id_major_version(dev->id) < 11)
2459 		goto out;
2460 
2461 	buf_len = ata_log_supported(dev, ATA_LOG_CONCURRENT_POSITIONING_RANGES);
2462 	if (buf_len == 0)
2463 		goto out;
2464 
2465 	/*
2466 	 * Read the concurrent positioning ranges log (0x47). We can have at
2467 	 * most 255 32B range descriptors plus a 64B header. This log varies in
2468 	 * size, so use the size reported in the GPL directory. Reading beyond
2469 	 * the supported length will result in an error.
2470 	 */
2471 	buf_len <<= 9;
2472 	buf = kzalloc(buf_len, GFP_KERNEL);
2473 	if (!buf)
2474 		goto out;
2475 
2476 	err_mask = ata_read_log_page(dev, ATA_LOG_CONCURRENT_POSITIONING_RANGES,
2477 				     0, buf, buf_len >> 9);
2478 	if (err_mask)
2479 		goto out;
2480 
2481 	nr_cpr = buf[0];
2482 	if (!nr_cpr)
2483 		goto out;
2484 
2485 	cpr_log = kzalloc(struct_size(cpr_log, cpr, nr_cpr), GFP_KERNEL);
2486 	if (!cpr_log)
2487 		goto out;
2488 
2489 	cpr_log->nr_cpr = nr_cpr;
2490 	desc = &buf[64];
2491 	for (i = 0; i < nr_cpr; i++, desc += 32) {
2492 		cpr_log->cpr[i].num = desc[0];
2493 		cpr_log->cpr[i].num_storage_elements = desc[1];
2494 		cpr_log->cpr[i].start_lba = get_unaligned_le64(&desc[8]);
2495 		cpr_log->cpr[i].num_lbas = get_unaligned_le64(&desc[16]);
2496 	}
2497 
2498 out:
2499 	swap(dev->cpr_log, cpr_log);
2500 	kfree(cpr_log);
2501 	kfree(buf);
2502 }
2503 
ata_dev_print_features(struct ata_device * dev)2504 static void ata_dev_print_features(struct ata_device *dev)
2505 {
2506 	if (!(dev->flags & ATA_DFLAG_FEATURES_MASK))
2507 		return;
2508 
2509 	ata_dev_info(dev,
2510 		     "Features:%s%s%s%s%s%s\n",
2511 		     dev->flags & ATA_DFLAG_TRUSTED ? " Trust" : "",
2512 		     dev->flags & ATA_DFLAG_DA ? " Dev-Attention" : "",
2513 		     dev->flags & ATA_DFLAG_DEVSLP ? " Dev-Sleep" : "",
2514 		     dev->flags & ATA_DFLAG_NCQ_SEND_RECV ? " NCQ-sndrcv" : "",
2515 		     dev->flags & ATA_DFLAG_NCQ_PRIO ? " NCQ-prio" : "",
2516 		     dev->cpr_log ? " CPR" : "");
2517 }
2518 
2519 /**
2520  *	ata_dev_configure - Configure the specified ATA/ATAPI device
2521  *	@dev: Target device to configure
2522  *
2523  *	Configure @dev according to @dev->id.  Generic and low-level
2524  *	driver specific fixups are also applied.
2525  *
2526  *	LOCKING:
2527  *	Kernel thread context (may sleep)
2528  *
2529  *	RETURNS:
2530  *	0 on success, -errno otherwise
2531  */
ata_dev_configure(struct ata_device * dev)2532 int ata_dev_configure(struct ata_device *dev)
2533 {
2534 	struct ata_port *ap = dev->link->ap;
2535 	bool print_info = ata_dev_print_info(dev);
2536 	const u16 *id = dev->id;
2537 	unsigned long xfer_mask;
2538 	unsigned int err_mask;
2539 	char revbuf[7];		/* XYZ-99\0 */
2540 	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
2541 	char modelbuf[ATA_ID_PROD_LEN+1];
2542 	int rc;
2543 
2544 	if (!ata_dev_enabled(dev)) {
2545 		ata_dev_dbg(dev, "no device\n");
2546 		return 0;
2547 	}
2548 
2549 	/* set horkage */
2550 	dev->horkage |= ata_dev_blacklisted(dev);
2551 	ata_force_horkage(dev);
2552 
2553 	if (dev->horkage & ATA_HORKAGE_DISABLE) {
2554 		ata_dev_info(dev, "unsupported device, disabling\n");
2555 		ata_dev_disable(dev);
2556 		return 0;
2557 	}
2558 
2559 	if ((!atapi_enabled || (ap->flags & ATA_FLAG_NO_ATAPI)) &&
2560 	    dev->class == ATA_DEV_ATAPI) {
2561 		ata_dev_warn(dev, "WARNING: ATAPI is %s, device ignored\n",
2562 			     atapi_enabled ? "not supported with this driver"
2563 			     : "disabled");
2564 		ata_dev_disable(dev);
2565 		return 0;
2566 	}
2567 
2568 	rc = ata_do_link_spd_horkage(dev);
2569 	if (rc)
2570 		return rc;
2571 
2572 	/* some WD SATA-1 drives have issues with LPM, turn on NOLPM for them */
2573 	if ((dev->horkage & ATA_HORKAGE_WD_BROKEN_LPM) &&
2574 	    (id[ATA_ID_SATA_CAPABILITY] & 0xe) == 0x2)
2575 		dev->horkage |= ATA_HORKAGE_NOLPM;
2576 
2577 	if (ap->flags & ATA_FLAG_NO_LPM)
2578 		dev->horkage |= ATA_HORKAGE_NOLPM;
2579 
2580 	if (dev->horkage & ATA_HORKAGE_NOLPM) {
2581 		ata_dev_warn(dev, "LPM support broken, forcing max_power\n");
2582 		dev->link->ap->target_lpm_policy = ATA_LPM_MAX_POWER;
2583 	}
2584 
2585 	/* let ACPI work its magic */
2586 	rc = ata_acpi_on_devcfg(dev);
2587 	if (rc)
2588 		return rc;
2589 
2590 	/* massage HPA, do it early as it might change IDENTIFY data */
2591 	rc = ata_hpa_resize(dev);
2592 	if (rc)
2593 		return rc;
2594 
2595 	/* print device capabilities */
2596 	ata_dev_dbg(dev,
2597 		    "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
2598 		    "85:%04x 86:%04x 87:%04x 88:%04x\n",
2599 		    __func__,
2600 		    id[49], id[82], id[83], id[84],
2601 		    id[85], id[86], id[87], id[88]);
2602 
2603 	/* initialize to-be-configured parameters */
2604 	dev->flags &= ~ATA_DFLAG_CFG_MASK;
2605 	dev->max_sectors = 0;
2606 	dev->cdb_len = 0;
2607 	dev->n_sectors = 0;
2608 	dev->cylinders = 0;
2609 	dev->heads = 0;
2610 	dev->sectors = 0;
2611 	dev->multi_count = 0;
2612 
2613 	/*
2614 	 * common ATA, ATAPI feature tests
2615 	 */
2616 
2617 	/* find max transfer mode; for printk only */
2618 	xfer_mask = ata_id_xfermask(id);
2619 
2620 	ata_dump_id(dev, id);
2621 
2622 	/* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
2623 	ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
2624 			sizeof(fwrevbuf));
2625 
2626 	ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
2627 			sizeof(modelbuf));
2628 
2629 	/* ATA-specific feature tests */
2630 	if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) {
2631 		if (ata_id_is_cfa(id)) {
2632 			/* CPRM may make this media unusable */
2633 			if (id[ATA_ID_CFA_KEY_MGMT] & 1)
2634 				ata_dev_warn(dev,
2635 	"supports DRM functions and may not be fully accessible\n");
2636 			snprintf(revbuf, 7, "CFA");
2637 		} else {
2638 			snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2639 			/* Warn the user if the device has TPM extensions */
2640 			if (ata_id_has_tpm(id))
2641 				ata_dev_warn(dev,
2642 	"supports DRM functions and may not be fully accessible\n");
2643 		}
2644 
2645 		dev->n_sectors = ata_id_n_sectors(id);
2646 
2647 		/* get current R/W Multiple count setting */
2648 		if ((dev->id[47] >> 8) == 0x80 && (dev->id[59] & 0x100)) {
2649 			unsigned int max = dev->id[47] & 0xff;
2650 			unsigned int cnt = dev->id[59] & 0xff;
2651 			/* only recognize/allow powers of two here */
2652 			if (is_power_of_2(max) && is_power_of_2(cnt))
2653 				if (cnt <= max)
2654 					dev->multi_count = cnt;
2655 		}
2656 
2657 		/* print device info to dmesg */
2658 		if (print_info)
2659 			ata_dev_info(dev, "%s: %s, %s, max %s\n",
2660 				     revbuf, modelbuf, fwrevbuf,
2661 				     ata_mode_string(xfer_mask));
2662 
2663 		if (ata_id_has_lba(id)) {
2664 			rc = ata_dev_config_lba(dev);
2665 			if (rc)
2666 				return rc;
2667 		} else {
2668 			ata_dev_config_chs(dev);
2669 		}
2670 
2671 		ata_dev_config_devslp(dev);
2672 		ata_dev_config_sense_reporting(dev);
2673 		ata_dev_config_zac(dev);
2674 		ata_dev_config_trusted(dev);
2675 		ata_dev_config_cpr(dev);
2676 		dev->cdb_len = 32;
2677 
2678 		if (print_info)
2679 			ata_dev_print_features(dev);
2680 	}
2681 
2682 	/* ATAPI-specific feature tests */
2683 	else if (dev->class == ATA_DEV_ATAPI) {
2684 		const char *cdb_intr_string = "";
2685 		const char *atapi_an_string = "";
2686 		const char *dma_dir_string = "";
2687 		u32 sntf;
2688 
2689 		rc = atapi_cdb_len(id);
2690 		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2691 			ata_dev_warn(dev, "unsupported CDB len %d\n", rc);
2692 			rc = -EINVAL;
2693 			goto err_out_nosup;
2694 		}
2695 		dev->cdb_len = (unsigned int) rc;
2696 
2697 		/* Enable ATAPI AN if both the host and device have
2698 		 * the support.  If PMP is attached, SNTF is required
2699 		 * to enable ATAPI AN to discern between PHY status
2700 		 * changed notifications and ATAPI ANs.
2701 		 */
2702 		if (atapi_an &&
2703 		    (ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
2704 		    (!sata_pmp_attached(ap) ||
2705 		     sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
2706 			/* issue SET feature command to turn this on */
2707 			err_mask = ata_dev_set_feature(dev,
2708 					SETFEATURES_SATA_ENABLE, SATA_AN);
2709 			if (err_mask)
2710 				ata_dev_err(dev,
2711 					    "failed to enable ATAPI AN (err_mask=0x%x)\n",
2712 					    err_mask);
2713 			else {
2714 				dev->flags |= ATA_DFLAG_AN;
2715 				atapi_an_string = ", ATAPI AN";
2716 			}
2717 		}
2718 
2719 		if (ata_id_cdb_intr(dev->id)) {
2720 			dev->flags |= ATA_DFLAG_CDB_INTR;
2721 			cdb_intr_string = ", CDB intr";
2722 		}
2723 
2724 		if (atapi_dmadir || (dev->horkage & ATA_HORKAGE_ATAPI_DMADIR) || atapi_id_dmadir(dev->id)) {
2725 			dev->flags |= ATA_DFLAG_DMADIR;
2726 			dma_dir_string = ", DMADIR";
2727 		}
2728 
2729 		if (ata_id_has_da(dev->id)) {
2730 			dev->flags |= ATA_DFLAG_DA;
2731 			zpodd_init(dev);
2732 		}
2733 
2734 		/* print device info to dmesg */
2735 		if (print_info)
2736 			ata_dev_info(dev,
2737 				     "ATAPI: %s, %s, max %s%s%s%s\n",
2738 				     modelbuf, fwrevbuf,
2739 				     ata_mode_string(xfer_mask),
2740 				     cdb_intr_string, atapi_an_string,
2741 				     dma_dir_string);
2742 	}
2743 
2744 	/* determine max_sectors */
2745 	dev->max_sectors = ATA_MAX_SECTORS;
2746 	if (dev->flags & ATA_DFLAG_LBA48)
2747 		dev->max_sectors = ATA_MAX_SECTORS_LBA48;
2748 
2749 	/* Limit PATA drive on SATA cable bridge transfers to udma5,
2750 	   200 sectors */
2751 	if (ata_dev_knobble(dev)) {
2752 		if (print_info)
2753 			ata_dev_info(dev, "applying bridge limits\n");
2754 		dev->udma_mask &= ATA_UDMA5;
2755 		dev->max_sectors = ATA_MAX_SECTORS;
2756 	}
2757 
2758 	if ((dev->class == ATA_DEV_ATAPI) &&
2759 	    (atapi_command_packet_set(id) == TYPE_TAPE)) {
2760 		dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2761 		dev->horkage |= ATA_HORKAGE_STUCK_ERR;
2762 	}
2763 
2764 	if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2765 		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
2766 					 dev->max_sectors);
2767 
2768 	if (dev->horkage & ATA_HORKAGE_MAX_SEC_1024)
2769 		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_1024,
2770 					 dev->max_sectors);
2771 
2772 	if (dev->horkage & ATA_HORKAGE_MAX_SEC_LBA48)
2773 		dev->max_sectors = ATA_MAX_SECTORS_LBA48;
2774 
2775 	if (ap->ops->dev_config)
2776 		ap->ops->dev_config(dev);
2777 
2778 	if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
2779 		/* Let the user know. We don't want to disallow opens for
2780 		   rescue purposes, or in case the vendor is just a blithering
2781 		   idiot. Do this after the dev_config call as some controllers
2782 		   with buggy firmware may want to avoid reporting false device
2783 		   bugs */
2784 
2785 		if (print_info) {
2786 			ata_dev_warn(dev,
2787 "Drive reports diagnostics failure. This may indicate a drive\n");
2788 			ata_dev_warn(dev,
2789 "fault or invalid emulation. Contact drive vendor for information.\n");
2790 		}
2791 	}
2792 
2793 	if ((dev->horkage & ATA_HORKAGE_FIRMWARE_WARN) && print_info) {
2794 		ata_dev_warn(dev, "WARNING: device requires firmware update to be fully functional\n");
2795 		ata_dev_warn(dev, "         contact the vendor or visit http://ata.wiki.kernel.org\n");
2796 	}
2797 
2798 	return 0;
2799 
2800 err_out_nosup:
2801 	return rc;
2802 }
2803 
2804 /**
2805  *	ata_cable_40wire	-	return 40 wire cable type
2806  *	@ap: port
2807  *
2808  *	Helper method for drivers which want to hardwire 40 wire cable
2809  *	detection.
2810  */
2811 
ata_cable_40wire(struct ata_port * ap)2812 int ata_cable_40wire(struct ata_port *ap)
2813 {
2814 	return ATA_CBL_PATA40;
2815 }
2816 EXPORT_SYMBOL_GPL(ata_cable_40wire);
2817 
2818 /**
2819  *	ata_cable_80wire	-	return 80 wire cable type
2820  *	@ap: port
2821  *
2822  *	Helper method for drivers which want to hardwire 80 wire cable
2823  *	detection.
2824  */
2825 
ata_cable_80wire(struct ata_port * ap)2826 int ata_cable_80wire(struct ata_port *ap)
2827 {
2828 	return ATA_CBL_PATA80;
2829 }
2830 EXPORT_SYMBOL_GPL(ata_cable_80wire);
2831 
2832 /**
2833  *	ata_cable_unknown	-	return unknown PATA cable.
2834  *	@ap: port
2835  *
2836  *	Helper method for drivers which have no PATA cable detection.
2837  */
2838 
ata_cable_unknown(struct ata_port * ap)2839 int ata_cable_unknown(struct ata_port *ap)
2840 {
2841 	return ATA_CBL_PATA_UNK;
2842 }
2843 EXPORT_SYMBOL_GPL(ata_cable_unknown);
2844 
2845 /**
2846  *	ata_cable_ignore	-	return ignored PATA cable.
2847  *	@ap: port
2848  *
2849  *	Helper method for drivers which don't use cable type to limit
2850  *	transfer mode.
2851  */
ata_cable_ignore(struct ata_port * ap)2852 int ata_cable_ignore(struct ata_port *ap)
2853 {
2854 	return ATA_CBL_PATA_IGN;
2855 }
2856 EXPORT_SYMBOL_GPL(ata_cable_ignore);
2857 
2858 /**
2859  *	ata_cable_sata	-	return SATA cable type
2860  *	@ap: port
2861  *
2862  *	Helper method for drivers which have SATA cables
2863  */
2864 
ata_cable_sata(struct ata_port * ap)2865 int ata_cable_sata(struct ata_port *ap)
2866 {
2867 	return ATA_CBL_SATA;
2868 }
2869 EXPORT_SYMBOL_GPL(ata_cable_sata);
2870 
2871 /**
2872  *	ata_bus_probe - Reset and probe ATA bus
2873  *	@ap: Bus to probe
2874  *
2875  *	Master ATA bus probing function.  Initiates a hardware-dependent
2876  *	bus reset, then attempts to identify any devices found on
2877  *	the bus.
2878  *
2879  *	LOCKING:
2880  *	PCI/etc. bus probe sem.
2881  *
2882  *	RETURNS:
2883  *	Zero on success, negative errno otherwise.
2884  */
2885 
ata_bus_probe(struct ata_port * ap)2886 int ata_bus_probe(struct ata_port *ap)
2887 {
2888 	unsigned int classes[ATA_MAX_DEVICES];
2889 	int tries[ATA_MAX_DEVICES];
2890 	int rc;
2891 	struct ata_device *dev;
2892 
2893 	ata_for_each_dev(dev, &ap->link, ALL)
2894 		tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2895 
2896  retry:
2897 	ata_for_each_dev(dev, &ap->link, ALL) {
2898 		/* If we issue an SRST then an ATA drive (not ATAPI)
2899 		 * may change configuration and be in PIO0 timing. If
2900 		 * we do a hard reset (or are coming from power on)
2901 		 * this is true for ATA or ATAPI. Until we've set a
2902 		 * suitable controller mode we should not touch the
2903 		 * bus as we may be talking too fast.
2904 		 */
2905 		dev->pio_mode = XFER_PIO_0;
2906 		dev->dma_mode = 0xff;
2907 
2908 		/* If the controller has a pio mode setup function
2909 		 * then use it to set the chipset to rights. Don't
2910 		 * touch the DMA setup as that will be dealt with when
2911 		 * configuring devices.
2912 		 */
2913 		if (ap->ops->set_piomode)
2914 			ap->ops->set_piomode(ap, dev);
2915 	}
2916 
2917 	/* reset and determine device classes */
2918 	ap->ops->phy_reset(ap);
2919 
2920 	ata_for_each_dev(dev, &ap->link, ALL) {
2921 		if (dev->class != ATA_DEV_UNKNOWN)
2922 			classes[dev->devno] = dev->class;
2923 		else
2924 			classes[dev->devno] = ATA_DEV_NONE;
2925 
2926 		dev->class = ATA_DEV_UNKNOWN;
2927 	}
2928 
2929 	/* read IDENTIFY page and configure devices. We have to do the identify
2930 	   specific sequence bass-ackwards so that PDIAG- is released by
2931 	   the slave device */
2932 
2933 	ata_for_each_dev(dev, &ap->link, ALL_REVERSE) {
2934 		if (tries[dev->devno])
2935 			dev->class = classes[dev->devno];
2936 
2937 		if (!ata_dev_enabled(dev))
2938 			continue;
2939 
2940 		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
2941 				     dev->id);
2942 		if (rc)
2943 			goto fail;
2944 	}
2945 
2946 	/* Now ask for the cable type as PDIAG- should have been released */
2947 	if (ap->ops->cable_detect)
2948 		ap->cbl = ap->ops->cable_detect(ap);
2949 
2950 	/* We may have SATA bridge glue hiding here irrespective of
2951 	 * the reported cable types and sensed types.  When SATA
2952 	 * drives indicate we have a bridge, we don't know which end
2953 	 * of the link the bridge is which is a problem.
2954 	 */
2955 	ata_for_each_dev(dev, &ap->link, ENABLED)
2956 		if (ata_id_is_sata(dev->id))
2957 			ap->cbl = ATA_CBL_SATA;
2958 
2959 	/* After the identify sequence we can now set up the devices. We do
2960 	   this in the normal order so that the user doesn't get confused */
2961 
2962 	ata_for_each_dev(dev, &ap->link, ENABLED) {
2963 		ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2964 		rc = ata_dev_configure(dev);
2965 		ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2966 		if (rc)
2967 			goto fail;
2968 	}
2969 
2970 	/* configure transfer mode */
2971 	rc = ata_set_mode(&ap->link, &dev);
2972 	if (rc)
2973 		goto fail;
2974 
2975 	ata_for_each_dev(dev, &ap->link, ENABLED)
2976 		return 0;
2977 
2978 	return -ENODEV;
2979 
2980  fail:
2981 	tries[dev->devno]--;
2982 
2983 	switch (rc) {
2984 	case -EINVAL:
2985 		/* eeek, something went very wrong, give up */
2986 		tries[dev->devno] = 0;
2987 		break;
2988 
2989 	case -ENODEV:
2990 		/* give it just one more chance */
2991 		tries[dev->devno] = min(tries[dev->devno], 1);
2992 		fallthrough;
2993 	case -EIO:
2994 		if (tries[dev->devno] == 1) {
2995 			/* This is the last chance, better to slow
2996 			 * down than lose it.
2997 			 */
2998 			sata_down_spd_limit(&ap->link, 0);
2999 			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
3000 		}
3001 	}
3002 
3003 	if (!tries[dev->devno])
3004 		ata_dev_disable(dev);
3005 
3006 	goto retry;
3007 }
3008 
3009 /**
3010  *	sata_print_link_status - Print SATA link status
3011  *	@link: SATA link to printk link status about
3012  *
3013  *	This function prints link speed and status of a SATA link.
3014  *
3015  *	LOCKING:
3016  *	None.
3017  */
sata_print_link_status(struct ata_link * link)3018 static void sata_print_link_status(struct ata_link *link)
3019 {
3020 	u32 sstatus, scontrol, tmp;
3021 
3022 	if (sata_scr_read(link, SCR_STATUS, &sstatus))
3023 		return;
3024 	sata_scr_read(link, SCR_CONTROL, &scontrol);
3025 
3026 	if (ata_phys_link_online(link)) {
3027 		tmp = (sstatus >> 4) & 0xf;
3028 		ata_link_info(link, "SATA link up %s (SStatus %X SControl %X)\n",
3029 			      sata_spd_string(tmp), sstatus, scontrol);
3030 	} else {
3031 		ata_link_info(link, "SATA link down (SStatus %X SControl %X)\n",
3032 			      sstatus, scontrol);
3033 	}
3034 }
3035 
3036 /**
3037  *	ata_dev_pair		-	return other device on cable
3038  *	@adev: device
3039  *
3040  *	Obtain the other device on the same cable, or if none is
3041  *	present NULL is returned
3042  */
3043 
ata_dev_pair(struct ata_device * adev)3044 struct ata_device *ata_dev_pair(struct ata_device *adev)
3045 {
3046 	struct ata_link *link = adev->link;
3047 	struct ata_device *pair = &link->device[1 - adev->devno];
3048 	if (!ata_dev_enabled(pair))
3049 		return NULL;
3050 	return pair;
3051 }
3052 EXPORT_SYMBOL_GPL(ata_dev_pair);
3053 
3054 /**
3055  *	sata_down_spd_limit - adjust SATA spd limit downward
3056  *	@link: Link to adjust SATA spd limit for
3057  *	@spd_limit: Additional limit
3058  *
3059  *	Adjust SATA spd limit of @link downward.  Note that this
3060  *	function only adjusts the limit.  The change must be applied
3061  *	using sata_set_spd().
3062  *
3063  *	If @spd_limit is non-zero, the speed is limited to equal to or
3064  *	lower than @spd_limit if such speed is supported.  If
3065  *	@spd_limit is slower than any supported speed, only the lowest
3066  *	supported speed is allowed.
3067  *
3068  *	LOCKING:
3069  *	Inherited from caller.
3070  *
3071  *	RETURNS:
3072  *	0 on success, negative errno on failure
3073  */
sata_down_spd_limit(struct ata_link * link,u32 spd_limit)3074 int sata_down_spd_limit(struct ata_link *link, u32 spd_limit)
3075 {
3076 	u32 sstatus, spd, mask;
3077 	int rc, bit;
3078 
3079 	if (!sata_scr_valid(link))
3080 		return -EOPNOTSUPP;
3081 
3082 	/* If SCR can be read, use it to determine the current SPD.
3083 	 * If not, use cached value in link->sata_spd.
3084 	 */
3085 	rc = sata_scr_read(link, SCR_STATUS, &sstatus);
3086 	if (rc == 0 && ata_sstatus_online(sstatus))
3087 		spd = (sstatus >> 4) & 0xf;
3088 	else
3089 		spd = link->sata_spd;
3090 
3091 	mask = link->sata_spd_limit;
3092 	if (mask <= 1)
3093 		return -EINVAL;
3094 
3095 	/* unconditionally mask off the highest bit */
3096 	bit = fls(mask) - 1;
3097 	mask &= ~(1 << bit);
3098 
3099 	/*
3100 	 * Mask off all speeds higher than or equal to the current one.  At
3101 	 * this point, if current SPD is not available and we previously
3102 	 * recorded the link speed from SStatus, the driver has already
3103 	 * masked off the highest bit so mask should already be 1 or 0.
3104 	 * Otherwise, we should not force 1.5Gbps on a link where we have
3105 	 * not previously recorded speed from SStatus.  Just return in this
3106 	 * case.
3107 	 */
3108 	if (spd > 1)
3109 		mask &= (1 << (spd - 1)) - 1;
3110 	else
3111 		return -EINVAL;
3112 
3113 	/* were we already at the bottom? */
3114 	if (!mask)
3115 		return -EINVAL;
3116 
3117 	if (spd_limit) {
3118 		if (mask & ((1 << spd_limit) - 1))
3119 			mask &= (1 << spd_limit) - 1;
3120 		else {
3121 			bit = ffs(mask) - 1;
3122 			mask = 1 << bit;
3123 		}
3124 	}
3125 
3126 	link->sata_spd_limit = mask;
3127 
3128 	ata_link_warn(link, "limiting SATA link speed to %s\n",
3129 		      sata_spd_string(fls(mask)));
3130 
3131 	return 0;
3132 }
3133 
3134 #ifdef CONFIG_ATA_ACPI
3135 /**
3136  *	ata_timing_cycle2mode - find xfer mode for the specified cycle duration
3137  *	@xfer_shift: ATA_SHIFT_* value for transfer type to examine.
3138  *	@cycle: cycle duration in ns
3139  *
3140  *	Return matching xfer mode for @cycle.  The returned mode is of
3141  *	the transfer type specified by @xfer_shift.  If @cycle is too
3142  *	slow for @xfer_shift, 0xff is returned.  If @cycle is faster
3143  *	than the fastest known mode, the fasted mode is returned.
3144  *
3145  *	LOCKING:
3146  *	None.
3147  *
3148  *	RETURNS:
3149  *	Matching xfer_mode, 0xff if no match found.
3150  */
ata_timing_cycle2mode(unsigned int xfer_shift,int cycle)3151 u8 ata_timing_cycle2mode(unsigned int xfer_shift, int cycle)
3152 {
3153 	u8 base_mode = 0xff, last_mode = 0xff;
3154 	const struct ata_xfer_ent *ent;
3155 	const struct ata_timing *t;
3156 
3157 	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
3158 		if (ent->shift == xfer_shift)
3159 			base_mode = ent->base;
3160 
3161 	for (t = ata_timing_find_mode(base_mode);
3162 	     t && ata_xfer_mode2shift(t->mode) == xfer_shift; t++) {
3163 		unsigned short this_cycle;
3164 
3165 		switch (xfer_shift) {
3166 		case ATA_SHIFT_PIO:
3167 		case ATA_SHIFT_MWDMA:
3168 			this_cycle = t->cycle;
3169 			break;
3170 		case ATA_SHIFT_UDMA:
3171 			this_cycle = t->udma;
3172 			break;
3173 		default:
3174 			return 0xff;
3175 		}
3176 
3177 		if (cycle > this_cycle)
3178 			break;
3179 
3180 		last_mode = t->mode;
3181 	}
3182 
3183 	return last_mode;
3184 }
3185 #endif
3186 
3187 /**
3188  *	ata_down_xfermask_limit - adjust dev xfer masks downward
3189  *	@dev: Device to adjust xfer masks
3190  *	@sel: ATA_DNXFER_* selector
3191  *
3192  *	Adjust xfer masks of @dev downward.  Note that this function
3193  *	does not apply the change.  Invoking ata_set_mode() afterwards
3194  *	will apply the limit.
3195  *
3196  *	LOCKING:
3197  *	Inherited from caller.
3198  *
3199  *	RETURNS:
3200  *	0 on success, negative errno on failure
3201  */
ata_down_xfermask_limit(struct ata_device * dev,unsigned int sel)3202 int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
3203 {
3204 	char buf[32];
3205 	unsigned long orig_mask, xfer_mask;
3206 	unsigned long pio_mask, mwdma_mask, udma_mask;
3207 	int quiet, highbit;
3208 
3209 	quiet = !!(sel & ATA_DNXFER_QUIET);
3210 	sel &= ~ATA_DNXFER_QUIET;
3211 
3212 	xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
3213 						  dev->mwdma_mask,
3214 						  dev->udma_mask);
3215 	ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
3216 
3217 	switch (sel) {
3218 	case ATA_DNXFER_PIO:
3219 		highbit = fls(pio_mask) - 1;
3220 		pio_mask &= ~(1 << highbit);
3221 		break;
3222 
3223 	case ATA_DNXFER_DMA:
3224 		if (udma_mask) {
3225 			highbit = fls(udma_mask) - 1;
3226 			udma_mask &= ~(1 << highbit);
3227 			if (!udma_mask)
3228 				return -ENOENT;
3229 		} else if (mwdma_mask) {
3230 			highbit = fls(mwdma_mask) - 1;
3231 			mwdma_mask &= ~(1 << highbit);
3232 			if (!mwdma_mask)
3233 				return -ENOENT;
3234 		}
3235 		break;
3236 
3237 	case ATA_DNXFER_40C:
3238 		udma_mask &= ATA_UDMA_MASK_40C;
3239 		break;
3240 
3241 	case ATA_DNXFER_FORCE_PIO0:
3242 		pio_mask &= 1;
3243 		fallthrough;
3244 	case ATA_DNXFER_FORCE_PIO:
3245 		mwdma_mask = 0;
3246 		udma_mask = 0;
3247 		break;
3248 
3249 	default:
3250 		BUG();
3251 	}
3252 
3253 	xfer_mask &= ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
3254 
3255 	if (!(xfer_mask & ATA_MASK_PIO) || xfer_mask == orig_mask)
3256 		return -ENOENT;
3257 
3258 	if (!quiet) {
3259 		if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
3260 			snprintf(buf, sizeof(buf), "%s:%s",
3261 				 ata_mode_string(xfer_mask),
3262 				 ata_mode_string(xfer_mask & ATA_MASK_PIO));
3263 		else
3264 			snprintf(buf, sizeof(buf), "%s",
3265 				 ata_mode_string(xfer_mask));
3266 
3267 		ata_dev_warn(dev, "limiting speed to %s\n", buf);
3268 	}
3269 
3270 	ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
3271 			    &dev->udma_mask);
3272 
3273 	return 0;
3274 }
3275 
ata_dev_set_mode(struct ata_device * dev)3276 static int ata_dev_set_mode(struct ata_device *dev)
3277 {
3278 	struct ata_port *ap = dev->link->ap;
3279 	struct ata_eh_context *ehc = &dev->link->eh_context;
3280 	const bool nosetxfer = dev->horkage & ATA_HORKAGE_NOSETXFER;
3281 	const char *dev_err_whine = "";
3282 	int ign_dev_err = 0;
3283 	unsigned int err_mask = 0;
3284 	int rc;
3285 
3286 	dev->flags &= ~ATA_DFLAG_PIO;
3287 	if (dev->xfer_shift == ATA_SHIFT_PIO)
3288 		dev->flags |= ATA_DFLAG_PIO;
3289 
3290 	if (nosetxfer && ap->flags & ATA_FLAG_SATA && ata_id_is_sata(dev->id))
3291 		dev_err_whine = " (SET_XFERMODE skipped)";
3292 	else {
3293 		if (nosetxfer)
3294 			ata_dev_warn(dev,
3295 				     "NOSETXFER but PATA detected - can't "
3296 				     "skip SETXFER, might malfunction\n");
3297 		err_mask = ata_dev_set_xfermode(dev);
3298 	}
3299 
3300 	if (err_mask & ~AC_ERR_DEV)
3301 		goto fail;
3302 
3303 	/* revalidate */
3304 	ehc->i.flags |= ATA_EHI_POST_SETMODE;
3305 	rc = ata_dev_revalidate(dev, ATA_DEV_UNKNOWN, 0);
3306 	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
3307 	if (rc)
3308 		return rc;
3309 
3310 	if (dev->xfer_shift == ATA_SHIFT_PIO) {
3311 		/* Old CFA may refuse this command, which is just fine */
3312 		if (ata_id_is_cfa(dev->id))
3313 			ign_dev_err = 1;
3314 		/* Catch several broken garbage emulations plus some pre
3315 		   ATA devices */
3316 		if (ata_id_major_version(dev->id) == 0 &&
3317 					dev->pio_mode <= XFER_PIO_2)
3318 			ign_dev_err = 1;
3319 		/* Some very old devices and some bad newer ones fail
3320 		   any kind of SET_XFERMODE request but support PIO0-2
3321 		   timings and no IORDY */
3322 		if (!ata_id_has_iordy(dev->id) && dev->pio_mode <= XFER_PIO_2)
3323 			ign_dev_err = 1;
3324 	}
3325 	/* Early MWDMA devices do DMA but don't allow DMA mode setting.
3326 	   Don't fail an MWDMA0 set IFF the device indicates it is in MWDMA0 */
3327 	if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3328 	    dev->dma_mode == XFER_MW_DMA_0 &&
3329 	    (dev->id[63] >> 8) & 1)
3330 		ign_dev_err = 1;
3331 
3332 	/* if the device is actually configured correctly, ignore dev err */
3333 	if (dev->xfer_mode == ata_xfer_mask2mode(ata_id_xfermask(dev->id)))
3334 		ign_dev_err = 1;
3335 
3336 	if (err_mask & AC_ERR_DEV) {
3337 		if (!ign_dev_err)
3338 			goto fail;
3339 		else
3340 			dev_err_whine = " (device error ignored)";
3341 	}
3342 
3343 	ata_dev_dbg(dev, "xfer_shift=%u, xfer_mode=0x%x\n",
3344 		    dev->xfer_shift, (int)dev->xfer_mode);
3345 
3346 	if (!(ehc->i.flags & ATA_EHI_QUIET) ||
3347 	    ehc->i.flags & ATA_EHI_DID_HARDRESET)
3348 		ata_dev_info(dev, "configured for %s%s\n",
3349 			     ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)),
3350 			     dev_err_whine);
3351 
3352 	return 0;
3353 
3354  fail:
3355 	ata_dev_err(dev, "failed to set xfermode (err_mask=0x%x)\n", err_mask);
3356 	return -EIO;
3357 }
3358 
3359 /**
3360  *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3361  *	@link: link on which timings will be programmed
3362  *	@r_failed_dev: out parameter for failed device
3363  *
3364  *	Standard implementation of the function used to tune and set
3365  *	ATA device disk transfer mode (PIO3, UDMA6, etc.).  If
3366  *	ata_dev_set_mode() fails, pointer to the failing device is
3367  *	returned in @r_failed_dev.
3368  *
3369  *	LOCKING:
3370  *	PCI/etc. bus probe sem.
3371  *
3372  *	RETURNS:
3373  *	0 on success, negative errno otherwise
3374  */
3375 
ata_do_set_mode(struct ata_link * link,struct ata_device ** r_failed_dev)3376 int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
3377 {
3378 	struct ata_port *ap = link->ap;
3379 	struct ata_device *dev;
3380 	int rc = 0, used_dma = 0, found = 0;
3381 
3382 	/* step 1: calculate xfer_mask */
3383 	ata_for_each_dev(dev, link, ENABLED) {
3384 		unsigned long pio_mask, dma_mask;
3385 		unsigned int mode_mask;
3386 
3387 		mode_mask = ATA_DMA_MASK_ATA;
3388 		if (dev->class == ATA_DEV_ATAPI)
3389 			mode_mask = ATA_DMA_MASK_ATAPI;
3390 		else if (ata_id_is_cfa(dev->id))
3391 			mode_mask = ATA_DMA_MASK_CFA;
3392 
3393 		ata_dev_xfermask(dev);
3394 		ata_force_xfermask(dev);
3395 
3396 		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
3397 
3398 		if (libata_dma_mask & mode_mask)
3399 			dma_mask = ata_pack_xfermask(0, dev->mwdma_mask,
3400 						     dev->udma_mask);
3401 		else
3402 			dma_mask = 0;
3403 
3404 		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
3405 		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3406 
3407 		found = 1;
3408 		if (ata_dma_enabled(dev))
3409 			used_dma = 1;
3410 	}
3411 	if (!found)
3412 		goto out;
3413 
3414 	/* step 2: always set host PIO timings */
3415 	ata_for_each_dev(dev, link, ENABLED) {
3416 		if (dev->pio_mode == 0xff) {
3417 			ata_dev_warn(dev, "no PIO support\n");
3418 			rc = -EINVAL;
3419 			goto out;
3420 		}
3421 
3422 		dev->xfer_mode = dev->pio_mode;
3423 		dev->xfer_shift = ATA_SHIFT_PIO;
3424 		if (ap->ops->set_piomode)
3425 			ap->ops->set_piomode(ap, dev);
3426 	}
3427 
3428 	/* step 3: set host DMA timings */
3429 	ata_for_each_dev(dev, link, ENABLED) {
3430 		if (!ata_dma_enabled(dev))
3431 			continue;
3432 
3433 		dev->xfer_mode = dev->dma_mode;
3434 		dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
3435 		if (ap->ops->set_dmamode)
3436 			ap->ops->set_dmamode(ap, dev);
3437 	}
3438 
3439 	/* step 4: update devices' xfer mode */
3440 	ata_for_each_dev(dev, link, ENABLED) {
3441 		rc = ata_dev_set_mode(dev);
3442 		if (rc)
3443 			goto out;
3444 	}
3445 
3446 	/* Record simplex status. If we selected DMA then the other
3447 	 * host channels are not permitted to do so.
3448 	 */
3449 	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
3450 		ap->host->simplex_claimed = ap;
3451 
3452  out:
3453 	if (rc)
3454 		*r_failed_dev = dev;
3455 	return rc;
3456 }
3457 EXPORT_SYMBOL_GPL(ata_do_set_mode);
3458 
3459 /**
3460  *	ata_wait_ready - wait for link to become ready
3461  *	@link: link to be waited on
3462  *	@deadline: deadline jiffies for the operation
3463  *	@check_ready: callback to check link readiness
3464  *
3465  *	Wait for @link to become ready.  @check_ready should return
3466  *	positive number if @link is ready, 0 if it isn't, -ENODEV if
3467  *	link doesn't seem to be occupied, other errno for other error
3468  *	conditions.
3469  *
3470  *	Transient -ENODEV conditions are allowed for
3471  *	ATA_TMOUT_FF_WAIT.
3472  *
3473  *	LOCKING:
3474  *	EH context.
3475  *
3476  *	RETURNS:
3477  *	0 if @link is ready before @deadline; otherwise, -errno.
3478  */
ata_wait_ready(struct ata_link * link,unsigned long deadline,int (* check_ready)(struct ata_link * link))3479 int ata_wait_ready(struct ata_link *link, unsigned long deadline,
3480 		   int (*check_ready)(struct ata_link *link))
3481 {
3482 	unsigned long start = jiffies;
3483 	unsigned long nodev_deadline;
3484 	int warned = 0;
3485 
3486 	/* choose which 0xff timeout to use, read comment in libata.h */
3487 	if (link->ap->host->flags & ATA_HOST_PARALLEL_SCAN)
3488 		nodev_deadline = ata_deadline(start, ATA_TMOUT_FF_WAIT_LONG);
3489 	else
3490 		nodev_deadline = ata_deadline(start, ATA_TMOUT_FF_WAIT);
3491 
3492 	/* Slave readiness can't be tested separately from master.  On
3493 	 * M/S emulation configuration, this function should be called
3494 	 * only on the master and it will handle both master and slave.
3495 	 */
3496 	WARN_ON(link == link->ap->slave_link);
3497 
3498 	if (time_after(nodev_deadline, deadline))
3499 		nodev_deadline = deadline;
3500 
3501 	while (1) {
3502 		unsigned long now = jiffies;
3503 		int ready, tmp;
3504 
3505 		ready = tmp = check_ready(link);
3506 		if (ready > 0)
3507 			return 0;
3508 
3509 		/*
3510 		 * -ENODEV could be transient.  Ignore -ENODEV if link
3511 		 * is online.  Also, some SATA devices take a long
3512 		 * time to clear 0xff after reset.  Wait for
3513 		 * ATA_TMOUT_FF_WAIT[_LONG] on -ENODEV if link isn't
3514 		 * offline.
3515 		 *
3516 		 * Note that some PATA controllers (pata_ali) explode
3517 		 * if status register is read more than once when
3518 		 * there's no device attached.
3519 		 */
3520 		if (ready == -ENODEV) {
3521 			if (ata_link_online(link))
3522 				ready = 0;
3523 			else if ((link->ap->flags & ATA_FLAG_SATA) &&
3524 				 !ata_link_offline(link) &&
3525 				 time_before(now, nodev_deadline))
3526 				ready = 0;
3527 		}
3528 
3529 		if (ready)
3530 			return ready;
3531 		if (time_after(now, deadline))
3532 			return -EBUSY;
3533 
3534 		if (!warned && time_after(now, start + 5 * HZ) &&
3535 		    (deadline - now > 3 * HZ)) {
3536 			ata_link_warn(link,
3537 				"link is slow to respond, please be patient "
3538 				"(ready=%d)\n", tmp);
3539 			warned = 1;
3540 		}
3541 
3542 		ata_msleep(link->ap, 50);
3543 	}
3544 }
3545 
3546 /**
3547  *	ata_wait_after_reset - wait for link to become ready after reset
3548  *	@link: link to be waited on
3549  *	@deadline: deadline jiffies for the operation
3550  *	@check_ready: callback to check link readiness
3551  *
3552  *	Wait for @link to become ready after reset.
3553  *
3554  *	LOCKING:
3555  *	EH context.
3556  *
3557  *	RETURNS:
3558  *	0 if @link is ready before @deadline; otherwise, -errno.
3559  */
ata_wait_after_reset(struct ata_link * link,unsigned long deadline,int (* check_ready)(struct ata_link * link))3560 int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
3561 				int (*check_ready)(struct ata_link *link))
3562 {
3563 	ata_msleep(link->ap, ATA_WAIT_AFTER_RESET);
3564 
3565 	return ata_wait_ready(link, deadline, check_ready);
3566 }
3567 EXPORT_SYMBOL_GPL(ata_wait_after_reset);
3568 
3569 /**
3570  *	ata_std_prereset - prepare for reset
3571  *	@link: ATA link to be reset
3572  *	@deadline: deadline jiffies for the operation
3573  *
3574  *	@link is about to be reset.  Initialize it.  Failure from
3575  *	prereset makes libata abort whole reset sequence and give up
3576  *	that port, so prereset should be best-effort.  It does its
3577  *	best to prepare for reset sequence but if things go wrong, it
3578  *	should just whine, not fail.
3579  *
3580  *	LOCKING:
3581  *	Kernel thread context (may sleep)
3582  *
3583  *	RETURNS:
3584  *	Always 0.
3585  */
ata_std_prereset(struct ata_link * link,unsigned long deadline)3586 int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3587 {
3588 	struct ata_port *ap = link->ap;
3589 	struct ata_eh_context *ehc = &link->eh_context;
3590 	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3591 	int rc;
3592 
3593 	/* if we're about to do hardreset, nothing more to do */
3594 	if (ehc->i.action & ATA_EH_HARDRESET)
3595 		return 0;
3596 
3597 	/* if SATA, resume link */
3598 	if (ap->flags & ATA_FLAG_SATA) {
3599 		rc = sata_link_resume(link, timing, deadline);
3600 		/* whine about phy resume failure but proceed */
3601 		if (rc && rc != -EOPNOTSUPP)
3602 			ata_link_warn(link,
3603 				      "failed to resume link for reset (errno=%d)\n",
3604 				      rc);
3605 	}
3606 
3607 	/* no point in trying softreset on offline link */
3608 	if (ata_phys_link_offline(link))
3609 		ehc->i.action &= ~ATA_EH_SOFTRESET;
3610 
3611 	return 0;
3612 }
3613 EXPORT_SYMBOL_GPL(ata_std_prereset);
3614 
3615 /**
3616  *	sata_std_hardreset - COMRESET w/o waiting or classification
3617  *	@link: link to reset
3618  *	@class: resulting class of attached device
3619  *	@deadline: deadline jiffies for the operation
3620  *
3621  *	Standard SATA COMRESET w/o waiting or classification.
3622  *
3623  *	LOCKING:
3624  *	Kernel thread context (may sleep)
3625  *
3626  *	RETURNS:
3627  *	0 if link offline, -EAGAIN if link online, -errno on errors.
3628  */
sata_std_hardreset(struct ata_link * link,unsigned int * class,unsigned long deadline)3629 int sata_std_hardreset(struct ata_link *link, unsigned int *class,
3630 		       unsigned long deadline)
3631 {
3632 	const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
3633 	bool online;
3634 	int rc;
3635 
3636 	/* do hardreset */
3637 	rc = sata_link_hardreset(link, timing, deadline, &online, NULL);
3638 	return online ? -EAGAIN : rc;
3639 }
3640 EXPORT_SYMBOL_GPL(sata_std_hardreset);
3641 
3642 /**
3643  *	ata_std_postreset - standard postreset callback
3644  *	@link: the target ata_link
3645  *	@classes: classes of attached devices
3646  *
3647  *	This function is invoked after a successful reset.  Note that
3648  *	the device might have been reset more than once using
3649  *	different reset methods before postreset is invoked.
3650  *
3651  *	LOCKING:
3652  *	Kernel thread context (may sleep)
3653  */
ata_std_postreset(struct ata_link * link,unsigned int * classes)3654 void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3655 {
3656 	u32 serror;
3657 
3658 	/* reset complete, clear SError */
3659 	if (!sata_scr_read(link, SCR_ERROR, &serror))
3660 		sata_scr_write(link, SCR_ERROR, serror);
3661 
3662 	/* print link status */
3663 	sata_print_link_status(link);
3664 }
3665 EXPORT_SYMBOL_GPL(ata_std_postreset);
3666 
3667 /**
3668  *	ata_dev_same_device - Determine whether new ID matches configured device
3669  *	@dev: device to compare against
3670  *	@new_class: class of the new device
3671  *	@new_id: IDENTIFY page of the new device
3672  *
3673  *	Compare @new_class and @new_id against @dev and determine
3674  *	whether @dev is the device indicated by @new_class and
3675  *	@new_id.
3676  *
3677  *	LOCKING:
3678  *	None.
3679  *
3680  *	RETURNS:
3681  *	1 if @dev matches @new_class and @new_id, 0 otherwise.
3682  */
ata_dev_same_device(struct ata_device * dev,unsigned int new_class,const u16 * new_id)3683 static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
3684 			       const u16 *new_id)
3685 {
3686 	const u16 *old_id = dev->id;
3687 	unsigned char model[2][ATA_ID_PROD_LEN + 1];
3688 	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3689 
3690 	if (dev->class != new_class) {
3691 		ata_dev_info(dev, "class mismatch %d != %d\n",
3692 			     dev->class, new_class);
3693 		return 0;
3694 	}
3695 
3696 	ata_id_c_string(old_id, model[0], ATA_ID_PROD, sizeof(model[0]));
3697 	ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1]));
3698 	ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0]));
3699 	ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1]));
3700 
3701 	if (strcmp(model[0], model[1])) {
3702 		ata_dev_info(dev, "model number mismatch '%s' != '%s'\n",
3703 			     model[0], model[1]);
3704 		return 0;
3705 	}
3706 
3707 	if (strcmp(serial[0], serial[1])) {
3708 		ata_dev_info(dev, "serial number mismatch '%s' != '%s'\n",
3709 			     serial[0], serial[1]);
3710 		return 0;
3711 	}
3712 
3713 	return 1;
3714 }
3715 
3716 /**
3717  *	ata_dev_reread_id - Re-read IDENTIFY data
3718  *	@dev: target ATA device
3719  *	@readid_flags: read ID flags
3720  *
3721  *	Re-read IDENTIFY page and make sure @dev is still attached to
3722  *	the port.
3723  *
3724  *	LOCKING:
3725  *	Kernel thread context (may sleep)
3726  *
3727  *	RETURNS:
3728  *	0 on success, negative errno otherwise
3729  */
ata_dev_reread_id(struct ata_device * dev,unsigned int readid_flags)3730 int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3731 {
3732 	unsigned int class = dev->class;
3733 	u16 *id = (void *)dev->link->ap->sector_buf;
3734 	int rc;
3735 
3736 	/* read ID data */
3737 	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3738 	if (rc)
3739 		return rc;
3740 
3741 	/* is the device still there? */
3742 	if (!ata_dev_same_device(dev, class, id))
3743 		return -ENODEV;
3744 
3745 	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3746 	return 0;
3747 }
3748 
3749 /**
3750  *	ata_dev_revalidate - Revalidate ATA device
3751  *	@dev: device to revalidate
3752  *	@new_class: new class code
3753  *	@readid_flags: read ID flags
3754  *
3755  *	Re-read IDENTIFY page, make sure @dev is still attached to the
3756  *	port and reconfigure it according to the new IDENTIFY page.
3757  *
3758  *	LOCKING:
3759  *	Kernel thread context (may sleep)
3760  *
3761  *	RETURNS:
3762  *	0 on success, negative errno otherwise
3763  */
ata_dev_revalidate(struct ata_device * dev,unsigned int new_class,unsigned int readid_flags)3764 int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
3765 		       unsigned int readid_flags)
3766 {
3767 	u64 n_sectors = dev->n_sectors;
3768 	u64 n_native_sectors = dev->n_native_sectors;
3769 	int rc;
3770 
3771 	if (!ata_dev_enabled(dev))
3772 		return -ENODEV;
3773 
3774 	/* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
3775 	if (ata_class_enabled(new_class) &&
3776 	    new_class != ATA_DEV_ATA &&
3777 	    new_class != ATA_DEV_ATAPI &&
3778 	    new_class != ATA_DEV_ZAC &&
3779 	    new_class != ATA_DEV_SEMB) {
3780 		ata_dev_info(dev, "class mismatch %u != %u\n",
3781 			     dev->class, new_class);
3782 		rc = -ENODEV;
3783 		goto fail;
3784 	}
3785 
3786 	/* re-read ID */
3787 	rc = ata_dev_reread_id(dev, readid_flags);
3788 	if (rc)
3789 		goto fail;
3790 
3791 	/* configure device according to the new ID */
3792 	rc = ata_dev_configure(dev);
3793 	if (rc)
3794 		goto fail;
3795 
3796 	/* verify n_sectors hasn't changed */
3797 	if (dev->class != ATA_DEV_ATA || !n_sectors ||
3798 	    dev->n_sectors == n_sectors)
3799 		return 0;
3800 
3801 	/* n_sectors has changed */
3802 	ata_dev_warn(dev, "n_sectors mismatch %llu != %llu\n",
3803 		     (unsigned long long)n_sectors,
3804 		     (unsigned long long)dev->n_sectors);
3805 
3806 	/*
3807 	 * Something could have caused HPA to be unlocked
3808 	 * involuntarily.  If n_native_sectors hasn't changed and the
3809 	 * new size matches it, keep the device.
3810 	 */
3811 	if (dev->n_native_sectors == n_native_sectors &&
3812 	    dev->n_sectors > n_sectors && dev->n_sectors == n_native_sectors) {
3813 		ata_dev_warn(dev,
3814 			     "new n_sectors matches native, probably "
3815 			     "late HPA unlock, n_sectors updated\n");
3816 		/* use the larger n_sectors */
3817 		return 0;
3818 	}
3819 
3820 	/*
3821 	 * Some BIOSes boot w/o HPA but resume w/ HPA locked.  Try
3822 	 * unlocking HPA in those cases.
3823 	 *
3824 	 * https://bugzilla.kernel.org/show_bug.cgi?id=15396
3825 	 */
3826 	if (dev->n_native_sectors == n_native_sectors &&
3827 	    dev->n_sectors < n_sectors && n_sectors == n_native_sectors &&
3828 	    !(dev->horkage & ATA_HORKAGE_BROKEN_HPA)) {
3829 		ata_dev_warn(dev,
3830 			     "old n_sectors matches native, probably "
3831 			     "late HPA lock, will try to unlock HPA\n");
3832 		/* try unlocking HPA */
3833 		dev->flags |= ATA_DFLAG_UNLOCK_HPA;
3834 		rc = -EIO;
3835 	} else
3836 		rc = -ENODEV;
3837 
3838 	/* restore original n_[native_]sectors and fail */
3839 	dev->n_native_sectors = n_native_sectors;
3840 	dev->n_sectors = n_sectors;
3841  fail:
3842 	ata_dev_err(dev, "revalidation failed (errno=%d)\n", rc);
3843 	return rc;
3844 }
3845 
3846 struct ata_blacklist_entry {
3847 	const char *model_num;
3848 	const char *model_rev;
3849 	unsigned long horkage;
3850 };
3851 
3852 static const struct ata_blacklist_entry ata_device_blacklist [] = {
3853 	/* Devices with DMA related problems under Linux */
3854 	{ "WDC AC11000H",	NULL,		ATA_HORKAGE_NODMA },
3855 	{ "WDC AC22100H",	NULL,		ATA_HORKAGE_NODMA },
3856 	{ "WDC AC32500H",	NULL,		ATA_HORKAGE_NODMA },
3857 	{ "WDC AC33100H",	NULL,		ATA_HORKAGE_NODMA },
3858 	{ "WDC AC31600H",	NULL,		ATA_HORKAGE_NODMA },
3859 	{ "WDC AC32100H",	"24.09P07",	ATA_HORKAGE_NODMA },
3860 	{ "WDC AC23200L",	"21.10N21",	ATA_HORKAGE_NODMA },
3861 	{ "Compaq CRD-8241B", 	NULL,		ATA_HORKAGE_NODMA },
3862 	{ "CRD-8400B",		NULL, 		ATA_HORKAGE_NODMA },
3863 	{ "CRD-848[02]B",	NULL,		ATA_HORKAGE_NODMA },
3864 	{ "CRD-84",		NULL,		ATA_HORKAGE_NODMA },
3865 	{ "SanDisk SDP3B",	NULL,		ATA_HORKAGE_NODMA },
3866 	{ "SanDisk SDP3B-64",	NULL,		ATA_HORKAGE_NODMA },
3867 	{ "SANYO CD-ROM CRD",	NULL,		ATA_HORKAGE_NODMA },
3868 	{ "HITACHI CDR-8",	NULL,		ATA_HORKAGE_NODMA },
3869 	{ "HITACHI CDR-8[34]35",NULL,		ATA_HORKAGE_NODMA },
3870 	{ "Toshiba CD-ROM XM-6202B", NULL,	ATA_HORKAGE_NODMA },
3871 	{ "TOSHIBA CD-ROM XM-1702BC", NULL,	ATA_HORKAGE_NODMA },
3872 	{ "CD-532E-A", 		NULL,		ATA_HORKAGE_NODMA },
3873 	{ "E-IDE CD-ROM CR-840",NULL,		ATA_HORKAGE_NODMA },
3874 	{ "CD-ROM Drive/F5A",	NULL,		ATA_HORKAGE_NODMA },
3875 	{ "WPI CDD-820", 	NULL,		ATA_HORKAGE_NODMA },
3876 	{ "SAMSUNG CD-ROM SC-148C", NULL,	ATA_HORKAGE_NODMA },
3877 	{ "SAMSUNG CD-ROM SC",	NULL,		ATA_HORKAGE_NODMA },
3878 	{ "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
3879 	{ "_NEC DV5800A", 	NULL,		ATA_HORKAGE_NODMA },
3880 	{ "SAMSUNG CD-ROM SN-124", "N001",	ATA_HORKAGE_NODMA },
3881 	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
3882 	{ " 2GB ATA Flash Disk", "ADMA428M",	ATA_HORKAGE_NODMA },
3883 	{ "VRFDFC22048UCHC-TE*", NULL,		ATA_HORKAGE_NODMA },
3884 	/* Odd clown on sil3726/4726 PMPs */
3885 	{ "Config  Disk",	NULL,		ATA_HORKAGE_DISABLE },
3886 	/* Similar story with ASMedia 1092 */
3887 	{ "ASMT109x- Config",	NULL,		ATA_HORKAGE_DISABLE },
3888 
3889 	/* Weird ATAPI devices */
3890 	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
3891 	{ "QUANTUM DAT    DAT72-000", NULL,	ATA_HORKAGE_ATAPI_MOD16_DMA },
3892 	{ "Slimtype DVD A  DS8A8SH", NULL,	ATA_HORKAGE_MAX_SEC_LBA48 },
3893 	{ "Slimtype DVD A  DS8A9SH", NULL,	ATA_HORKAGE_MAX_SEC_LBA48 },
3894 
3895 	/*
3896 	 * Causes silent data corruption with higher max sects.
3897 	 * http://lkml.kernel.org/g/x49wpy40ysk.fsf@segfault.boston.devel.redhat.com
3898 	 */
3899 	{ "ST380013AS",		"3.20",		ATA_HORKAGE_MAX_SEC_1024 },
3900 
3901 	/*
3902 	 * These devices time out with higher max sects.
3903 	 * https://bugzilla.kernel.org/show_bug.cgi?id=121671
3904 	 */
3905 	{ "LITEON CX1-JB*-HP",	NULL,		ATA_HORKAGE_MAX_SEC_1024 },
3906 	{ "LITEON EP1-*",	NULL,		ATA_HORKAGE_MAX_SEC_1024 },
3907 
3908 	/* Devices we expect to fail diagnostics */
3909 
3910 	/* Devices where NCQ should be avoided */
3911 	/* NCQ is slow */
3912 	{ "WDC WD740ADFD-00",	NULL,		ATA_HORKAGE_NONCQ },
3913 	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ },
3914 	/* http://thread.gmane.org/gmane.linux.ide/14907 */
3915 	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
3916 	/* NCQ is broken */
3917 	{ "Maxtor *",		"BANC*",	ATA_HORKAGE_NONCQ },
3918 	{ "Maxtor 7V300F0",	"VA111630",	ATA_HORKAGE_NONCQ },
3919 	{ "ST380817AS",		"3.42",		ATA_HORKAGE_NONCQ },
3920 	{ "ST3160023AS",	"3.42",		ATA_HORKAGE_NONCQ },
3921 	{ "OCZ CORE_SSD",	"02.10104",	ATA_HORKAGE_NONCQ },
3922 
3923 	/* Seagate NCQ + FLUSH CACHE firmware bug */
3924 	{ "ST31500341AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
3925 						ATA_HORKAGE_FIRMWARE_WARN },
3926 
3927 	{ "ST31000333AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
3928 						ATA_HORKAGE_FIRMWARE_WARN },
3929 
3930 	{ "ST3640[36]23AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
3931 						ATA_HORKAGE_FIRMWARE_WARN },
3932 
3933 	{ "ST3320[68]13AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
3934 						ATA_HORKAGE_FIRMWARE_WARN },
3935 
3936 	/* drives which fail FPDMA_AA activation (some may freeze afterwards)
3937 	   the ST disks also have LPM issues */
3938 	{ "ST1000LM024 HN-M101MBB", NULL,	ATA_HORKAGE_BROKEN_FPDMA_AA |
3939 						ATA_HORKAGE_NOLPM },
3940 	{ "VB0250EAVER",	"HPG7",		ATA_HORKAGE_BROKEN_FPDMA_AA },
3941 
3942 	/* Blacklist entries taken from Silicon Image 3124/3132
3943 	   Windows driver .inf file - also several Linux problem reports */
3944 	{ "HTS541060G9SA00",    "MB3OC60D",     ATA_HORKAGE_NONCQ },
3945 	{ "HTS541080G9SA00",    "MB4OC60D",     ATA_HORKAGE_NONCQ },
3946 	{ "HTS541010G9SA00",    "MBZOC60D",     ATA_HORKAGE_NONCQ },
3947 
3948 	/* https://bugzilla.kernel.org/show_bug.cgi?id=15573 */
3949 	{ "C300-CTFDDAC128MAG",	"0001",		ATA_HORKAGE_NONCQ },
3950 
3951 	/* Sandisk SD7/8/9s lock up hard on large trims */
3952 	{ "SanDisk SD[789]*",	NULL,		ATA_HORKAGE_MAX_TRIM_128M },
3953 
3954 	/* devices which puke on READ_NATIVE_MAX */
3955 	{ "HDS724040KLSA80",	"KFAOA20N",	ATA_HORKAGE_BROKEN_HPA },
3956 	{ "WDC WD3200JD-00KLB0", "WD-WCAMR1130137", ATA_HORKAGE_BROKEN_HPA },
3957 	{ "WDC WD2500JD-00HBB0", "WD-WMAL71490727", ATA_HORKAGE_BROKEN_HPA },
3958 	{ "MAXTOR 6L080L4",	"A93.0500",	ATA_HORKAGE_BROKEN_HPA },
3959 
3960 	/* this one allows HPA unlocking but fails IOs on the area */
3961 	{ "OCZ-VERTEX",		    "1.30",	ATA_HORKAGE_BROKEN_HPA },
3962 
3963 	/* Devices which report 1 sector over size HPA */
3964 	{ "ST340823A",		NULL,		ATA_HORKAGE_HPA_SIZE },
3965 	{ "ST320413A",		NULL,		ATA_HORKAGE_HPA_SIZE },
3966 	{ "ST310211A",		NULL,		ATA_HORKAGE_HPA_SIZE },
3967 
3968 	/* Devices which get the IVB wrong */
3969 	{ "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB },
3970 	/* Maybe we should just blacklist TSSTcorp... */
3971 	{ "TSSTcorp CDDVDW SH-S202[HJN]", "SB0[01]",  ATA_HORKAGE_IVB },
3972 
3973 	/* Devices that do not need bridging limits applied */
3974 	{ "MTRON MSP-SATA*",		NULL,	ATA_HORKAGE_BRIDGE_OK },
3975 	{ "BUFFALO HD-QSU2/R5",		NULL,	ATA_HORKAGE_BRIDGE_OK },
3976 
3977 	/* Devices which aren't very happy with higher link speeds */
3978 	{ "WD My Book",			NULL,	ATA_HORKAGE_1_5_GBPS },
3979 	{ "Seagate FreeAgent GoFlex",	NULL,	ATA_HORKAGE_1_5_GBPS },
3980 
3981 	/*
3982 	 * Devices which choke on SETXFER.  Applies only if both the
3983 	 * device and controller are SATA.
3984 	 */
3985 	{ "PIONEER DVD-RW  DVRTD08",	NULL,	ATA_HORKAGE_NOSETXFER },
3986 	{ "PIONEER DVD-RW  DVRTD08A",	NULL,	ATA_HORKAGE_NOSETXFER },
3987 	{ "PIONEER DVD-RW  DVR-215",	NULL,	ATA_HORKAGE_NOSETXFER },
3988 	{ "PIONEER DVD-RW  DVR-212D",	NULL,	ATA_HORKAGE_NOSETXFER },
3989 	{ "PIONEER DVD-RW  DVR-216D",	NULL,	ATA_HORKAGE_NOSETXFER },
3990 
3991 	/* Crucial BX100 SSD 500GB has broken LPM support */
3992 	{ "CT500BX100SSD1",		NULL,	ATA_HORKAGE_NOLPM },
3993 
3994 	/* 512GB MX100 with MU01 firmware has both queued TRIM and LPM issues */
3995 	{ "Crucial_CT512MX100*",	"MU01",	ATA_HORKAGE_NO_NCQ_TRIM |
3996 						ATA_HORKAGE_ZERO_AFTER_TRIM |
3997 						ATA_HORKAGE_NOLPM },
3998 	/* 512GB MX100 with newer firmware has only LPM issues */
3999 	{ "Crucial_CT512MX100*",	NULL,	ATA_HORKAGE_ZERO_AFTER_TRIM |
4000 						ATA_HORKAGE_NOLPM },
4001 
4002 	/* 480GB+ M500 SSDs have both queued TRIM and LPM issues */
4003 	{ "Crucial_CT480M500*",		NULL,	ATA_HORKAGE_NO_NCQ_TRIM |
4004 						ATA_HORKAGE_ZERO_AFTER_TRIM |
4005 						ATA_HORKAGE_NOLPM },
4006 	{ "Crucial_CT960M500*",		NULL,	ATA_HORKAGE_NO_NCQ_TRIM |
4007 						ATA_HORKAGE_ZERO_AFTER_TRIM |
4008 						ATA_HORKAGE_NOLPM },
4009 
4010 	/* These specific Samsung models/firmware-revs do not handle LPM well */
4011 	{ "SAMSUNG MZMPC128HBFU-000MV", "CXM14M1Q", ATA_HORKAGE_NOLPM },
4012 	{ "SAMSUNG SSD PM830 mSATA *",  "CXM13D1Q", ATA_HORKAGE_NOLPM },
4013 	{ "SAMSUNG MZ7TD256HAFV-000L9", NULL,       ATA_HORKAGE_NOLPM },
4014 	{ "SAMSUNG MZ7TE512HMHP-000L1", "EXT06L0Q", ATA_HORKAGE_NOLPM },
4015 
4016 	/* devices that don't properly handle queued TRIM commands */
4017 	{ "Micron_M500IT_*",		"MU01",	ATA_HORKAGE_NO_NCQ_TRIM |
4018 						ATA_HORKAGE_ZERO_AFTER_TRIM },
4019 	{ "Micron_M500_*",		NULL,	ATA_HORKAGE_NO_NCQ_TRIM |
4020 						ATA_HORKAGE_ZERO_AFTER_TRIM },
4021 	{ "Crucial_CT*M500*",		NULL,	ATA_HORKAGE_NO_NCQ_TRIM |
4022 						ATA_HORKAGE_ZERO_AFTER_TRIM },
4023 	{ "Micron_M5[15]0_*",		"MU01",	ATA_HORKAGE_NO_NCQ_TRIM |
4024 						ATA_HORKAGE_ZERO_AFTER_TRIM },
4025 	{ "Crucial_CT*M550*",		"MU01",	ATA_HORKAGE_NO_NCQ_TRIM |
4026 						ATA_HORKAGE_ZERO_AFTER_TRIM },
4027 	{ "Crucial_CT*MX100*",		"MU01",	ATA_HORKAGE_NO_NCQ_TRIM |
4028 						ATA_HORKAGE_ZERO_AFTER_TRIM },
4029 	{ "Samsung SSD 840 EVO*",	NULL,	ATA_HORKAGE_NO_NCQ_TRIM |
4030 						ATA_HORKAGE_NO_DMA_LOG |
4031 						ATA_HORKAGE_ZERO_AFTER_TRIM },
4032 	{ "Samsung SSD 840*",		NULL,	ATA_HORKAGE_NO_NCQ_TRIM |
4033 						ATA_HORKAGE_ZERO_AFTER_TRIM },
4034 	{ "Samsung SSD 850*",		NULL,	ATA_HORKAGE_NO_NCQ_TRIM |
4035 						ATA_HORKAGE_ZERO_AFTER_TRIM },
4036 	{ "Samsung SSD 860*",		NULL,	ATA_HORKAGE_NO_NCQ_TRIM |
4037 						ATA_HORKAGE_ZERO_AFTER_TRIM |
4038 						ATA_HORKAGE_NO_NCQ_ON_ATI },
4039 	{ "Samsung SSD 870*",		NULL,	ATA_HORKAGE_NO_NCQ_TRIM |
4040 						ATA_HORKAGE_ZERO_AFTER_TRIM |
4041 						ATA_HORKAGE_NO_NCQ_ON_ATI },
4042 	{ "FCCT*M500*",			NULL,	ATA_HORKAGE_NO_NCQ_TRIM |
4043 						ATA_HORKAGE_ZERO_AFTER_TRIM },
4044 
4045 	/* devices that don't properly handle TRIM commands */
4046 	{ "SuperSSpeed S238*",		NULL,	ATA_HORKAGE_NOTRIM },
4047 	{ "M88V29*",			NULL,	ATA_HORKAGE_NOTRIM },
4048 
4049 	/*
4050 	 * As defined, the DRAT (Deterministic Read After Trim) and RZAT
4051 	 * (Return Zero After Trim) flags in the ATA Command Set are
4052 	 * unreliable in the sense that they only define what happens if
4053 	 * the device successfully executed the DSM TRIM command. TRIM
4054 	 * is only advisory, however, and the device is free to silently
4055 	 * ignore all or parts of the request.
4056 	 *
4057 	 * Whitelist drives that are known to reliably return zeroes
4058 	 * after TRIM.
4059 	 */
4060 
4061 	/*
4062 	 * The intel 510 drive has buggy DRAT/RZAT. Explicitly exclude
4063 	 * that model before whitelisting all other intel SSDs.
4064 	 */
4065 	{ "INTEL*SSDSC2MH*",		NULL,	0 },
4066 
4067 	{ "Micron*",			NULL,	ATA_HORKAGE_ZERO_AFTER_TRIM },
4068 	{ "Crucial*",			NULL,	ATA_HORKAGE_ZERO_AFTER_TRIM },
4069 	{ "INTEL*SSD*", 		NULL,	ATA_HORKAGE_ZERO_AFTER_TRIM },
4070 	{ "SSD*INTEL*",			NULL,	ATA_HORKAGE_ZERO_AFTER_TRIM },
4071 	{ "Samsung*SSD*",		NULL,	ATA_HORKAGE_ZERO_AFTER_TRIM },
4072 	{ "SAMSUNG*SSD*",		NULL,	ATA_HORKAGE_ZERO_AFTER_TRIM },
4073 	{ "SAMSUNG*MZ7KM*",		NULL,	ATA_HORKAGE_ZERO_AFTER_TRIM },
4074 	{ "ST[1248][0248]0[FH]*",	NULL,	ATA_HORKAGE_ZERO_AFTER_TRIM },
4075 
4076 	/*
4077 	 * Some WD SATA-I drives spin up and down erratically when the link
4078 	 * is put into the slumber mode.  We don't have full list of the
4079 	 * affected devices.  Disable LPM if the device matches one of the
4080 	 * known prefixes and is SATA-1.  As a side effect LPM partial is
4081 	 * lost too.
4082 	 *
4083 	 * https://bugzilla.kernel.org/show_bug.cgi?id=57211
4084 	 */
4085 	{ "WDC WD800JD-*",		NULL,	ATA_HORKAGE_WD_BROKEN_LPM },
4086 	{ "WDC WD1200JD-*",		NULL,	ATA_HORKAGE_WD_BROKEN_LPM },
4087 	{ "WDC WD1600JD-*",		NULL,	ATA_HORKAGE_WD_BROKEN_LPM },
4088 	{ "WDC WD2000JD-*",		NULL,	ATA_HORKAGE_WD_BROKEN_LPM },
4089 	{ "WDC WD2500JD-*",		NULL,	ATA_HORKAGE_WD_BROKEN_LPM },
4090 	{ "WDC WD3000JD-*",		NULL,	ATA_HORKAGE_WD_BROKEN_LPM },
4091 	{ "WDC WD3200JD-*",		NULL,	ATA_HORKAGE_WD_BROKEN_LPM },
4092 
4093 	/*
4094 	 * This sata dom device goes on a walkabout when the ATA_LOG_DIRECTORY
4095 	 * log page is accessed. Ensure we never ask for this log page with
4096 	 * these devices.
4097 	 */
4098 	{ "SATADOM-ML 3ME",		NULL,	ATA_HORKAGE_NO_LOG_DIR },
4099 
4100 	/* End Marker */
4101 	{ }
4102 };
4103 
ata_dev_blacklisted(const struct ata_device * dev)4104 static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
4105 {
4106 	unsigned char model_num[ATA_ID_PROD_LEN + 1];
4107 	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4108 	const struct ata_blacklist_entry *ad = ata_device_blacklist;
4109 
4110 	ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
4111 	ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
4112 
4113 	while (ad->model_num) {
4114 		if (glob_match(ad->model_num, model_num)) {
4115 			if (ad->model_rev == NULL)
4116 				return ad->horkage;
4117 			if (glob_match(ad->model_rev, model_rev))
4118 				return ad->horkage;
4119 		}
4120 		ad++;
4121 	}
4122 	return 0;
4123 }
4124 
ata_dma_blacklisted(const struct ata_device * dev)4125 static int ata_dma_blacklisted(const struct ata_device *dev)
4126 {
4127 	/* We don't support polling DMA.
4128 	 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
4129 	 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
4130 	 */
4131 	if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4132 	    (dev->flags & ATA_DFLAG_CDB_INTR))
4133 		return 1;
4134 	return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4135 }
4136 
4137 /**
4138  *	ata_is_40wire		-	check drive side detection
4139  *	@dev: device
4140  *
4141  *	Perform drive side detection decoding, allowing for device vendors
4142  *	who can't follow the documentation.
4143  */
4144 
ata_is_40wire(struct ata_device * dev)4145 static int ata_is_40wire(struct ata_device *dev)
4146 {
4147 	if (dev->horkage & ATA_HORKAGE_IVB)
4148 		return ata_drive_40wire_relaxed(dev->id);
4149 	return ata_drive_40wire(dev->id);
4150 }
4151 
4152 /**
4153  *	cable_is_40wire		-	40/80/SATA decider
4154  *	@ap: port to consider
4155  *
4156  *	This function encapsulates the policy for speed management
4157  *	in one place. At the moment we don't cache the result but
4158  *	there is a good case for setting ap->cbl to the result when
4159  *	we are called with unknown cables (and figuring out if it
4160  *	impacts hotplug at all).
4161  *
4162  *	Return 1 if the cable appears to be 40 wire.
4163  */
4164 
cable_is_40wire(struct ata_port * ap)4165 static int cable_is_40wire(struct ata_port *ap)
4166 {
4167 	struct ata_link *link;
4168 	struct ata_device *dev;
4169 
4170 	/* If the controller thinks we are 40 wire, we are. */
4171 	if (ap->cbl == ATA_CBL_PATA40)
4172 		return 1;
4173 
4174 	/* If the controller thinks we are 80 wire, we are. */
4175 	if (ap->cbl == ATA_CBL_PATA80 || ap->cbl == ATA_CBL_SATA)
4176 		return 0;
4177 
4178 	/* If the system is known to be 40 wire short cable (eg
4179 	 * laptop), then we allow 80 wire modes even if the drive
4180 	 * isn't sure.
4181 	 */
4182 	if (ap->cbl == ATA_CBL_PATA40_SHORT)
4183 		return 0;
4184 
4185 	/* If the controller doesn't know, we scan.
4186 	 *
4187 	 * Note: We look for all 40 wire detects at this point.  Any
4188 	 *       80 wire detect is taken to be 80 wire cable because
4189 	 * - in many setups only the one drive (slave if present) will
4190 	 *   give a valid detect
4191 	 * - if you have a non detect capable drive you don't want it
4192 	 *   to colour the choice
4193 	 */
4194 	ata_for_each_link(link, ap, EDGE) {
4195 		ata_for_each_dev(dev, link, ENABLED) {
4196 			if (!ata_is_40wire(dev))
4197 				return 0;
4198 		}
4199 	}
4200 	return 1;
4201 }
4202 
4203 /**
4204  *	ata_dev_xfermask - Compute supported xfermask of the given device
4205  *	@dev: Device to compute xfermask for
4206  *
4207  *	Compute supported xfermask of @dev and store it in
4208  *	dev->*_mask.  This function is responsible for applying all
4209  *	known limits including host controller limits, device
4210  *	blacklist, etc...
4211  *
4212  *	LOCKING:
4213  *	None.
4214  */
ata_dev_xfermask(struct ata_device * dev)4215 static void ata_dev_xfermask(struct ata_device *dev)
4216 {
4217 	struct ata_link *link = dev->link;
4218 	struct ata_port *ap = link->ap;
4219 	struct ata_host *host = ap->host;
4220 	unsigned long xfer_mask;
4221 
4222 	/* controller modes available */
4223 	xfer_mask = ata_pack_xfermask(ap->pio_mask,
4224 				      ap->mwdma_mask, ap->udma_mask);
4225 
4226 	/* drive modes available */
4227 	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
4228 				       dev->mwdma_mask, dev->udma_mask);
4229 	xfer_mask &= ata_id_xfermask(dev->id);
4230 
4231 	/*
4232 	 *	CFA Advanced TrueIDE timings are not allowed on a shared
4233 	 *	cable
4234 	 */
4235 	if (ata_dev_pair(dev)) {
4236 		/* No PIO5 or PIO6 */
4237 		xfer_mask &= ~(0x03 << (ATA_SHIFT_PIO + 5));
4238 		/* No MWDMA3 or MWDMA 4 */
4239 		xfer_mask &= ~(0x03 << (ATA_SHIFT_MWDMA + 3));
4240 	}
4241 
4242 	if (ata_dma_blacklisted(dev)) {
4243 		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4244 		ata_dev_warn(dev,
4245 			     "device is on DMA blacklist, disabling DMA\n");
4246 	}
4247 
4248 	if ((host->flags & ATA_HOST_SIMPLEX) &&
4249 	    host->simplex_claimed && host->simplex_claimed != ap) {
4250 		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4251 		ata_dev_warn(dev,
4252 			     "simplex DMA is claimed by other device, disabling DMA\n");
4253 	}
4254 
4255 	if (ap->flags & ATA_FLAG_NO_IORDY)
4256 		xfer_mask &= ata_pio_mask_no_iordy(dev);
4257 
4258 	if (ap->ops->mode_filter)
4259 		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4260 
4261 	/* Apply cable rule here.  Don't apply it early because when
4262 	 * we handle hot plug the cable type can itself change.
4263 	 * Check this last so that we know if the transfer rate was
4264 	 * solely limited by the cable.
4265 	 * Unknown or 80 wire cables reported host side are checked
4266 	 * drive side as well. Cases where we know a 40wire cable
4267 	 * is used safely for 80 are not checked here.
4268 	 */
4269 	if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
4270 		/* UDMA/44 or higher would be available */
4271 		if (cable_is_40wire(ap)) {
4272 			ata_dev_warn(dev,
4273 				     "limited to UDMA/33 due to 40-wire cable\n");
4274 			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
4275 		}
4276 
4277 	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
4278 			    &dev->mwdma_mask, &dev->udma_mask);
4279 }
4280 
4281 /**
4282  *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
4283  *	@dev: Device to which command will be sent
4284  *
4285  *	Issue SET FEATURES - XFER MODE command to device @dev
4286  *	on port @ap.
4287  *
4288  *	LOCKING:
4289  *	PCI/etc. bus probe sem.
4290  *
4291  *	RETURNS:
4292  *	0 on success, AC_ERR_* mask otherwise.
4293  */
4294 
ata_dev_set_xfermode(struct ata_device * dev)4295 static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
4296 {
4297 	struct ata_taskfile tf;
4298 	unsigned int err_mask;
4299 
4300 	/* set up set-features taskfile */
4301 	ata_dev_dbg(dev, "set features - xfer mode\n");
4302 
4303 	/* Some controllers and ATAPI devices show flaky interrupt
4304 	 * behavior after setting xfer mode.  Use polling instead.
4305 	 */
4306 	ata_tf_init(dev, &tf);
4307 	tf.command = ATA_CMD_SET_FEATURES;
4308 	tf.feature = SETFEATURES_XFER;
4309 	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4310 	tf.protocol = ATA_PROT_NODATA;
4311 	/* If we are using IORDY we must send the mode setting command */
4312 	if (ata_pio_need_iordy(dev))
4313 		tf.nsect = dev->xfer_mode;
4314 	/* If the device has IORDY and the controller does not - turn it off */
4315  	else if (ata_id_has_iordy(dev->id))
4316 		tf.nsect = 0x01;
4317 	else /* In the ancient relic department - skip all of this */
4318 		return 0;
4319 
4320 	/* On some disks, this command causes spin-up, so we need longer timeout */
4321 	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 15000);
4322 
4323 	return err_mask;
4324 }
4325 
4326 /**
4327  *	ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4328  *	@dev: Device to which command will be sent
4329  *	@enable: Whether to enable or disable the feature
4330  *	@feature: The sector count represents the feature to set
4331  *
4332  *	Issue SET FEATURES - SATA FEATURES command to device @dev
4333  *	on port @ap with sector count
4334  *
4335  *	LOCKING:
4336  *	PCI/etc. bus probe sem.
4337  *
4338  *	RETURNS:
4339  *	0 on success, AC_ERR_* mask otherwise.
4340  */
ata_dev_set_feature(struct ata_device * dev,u8 enable,u8 feature)4341 unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable, u8 feature)
4342 {
4343 	struct ata_taskfile tf;
4344 	unsigned int err_mask;
4345 	unsigned long timeout = 0;
4346 
4347 	/* set up set-features taskfile */
4348 	ata_dev_dbg(dev, "set features - SATA features\n");
4349 
4350 	ata_tf_init(dev, &tf);
4351 	tf.command = ATA_CMD_SET_FEATURES;
4352 	tf.feature = enable;
4353 	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4354 	tf.protocol = ATA_PROT_NODATA;
4355 	tf.nsect = feature;
4356 
4357 	if (enable == SETFEATURES_SPINUP)
4358 		timeout = ata_probe_timeout ?
4359 			  ata_probe_timeout * 1000 : SETFEATURES_SPINUP_TIMEOUT;
4360 	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, timeout);
4361 
4362 	return err_mask;
4363 }
4364 EXPORT_SYMBOL_GPL(ata_dev_set_feature);
4365 
4366 /**
4367  *	ata_dev_init_params - Issue INIT DEV PARAMS command
4368  *	@dev: Device to which command will be sent
4369  *	@heads: Number of heads (taskfile parameter)
4370  *	@sectors: Number of sectors (taskfile parameter)
4371  *
4372  *	LOCKING:
4373  *	Kernel thread context (may sleep)
4374  *
4375  *	RETURNS:
4376  *	0 on success, AC_ERR_* mask otherwise.
4377  */
ata_dev_init_params(struct ata_device * dev,u16 heads,u16 sectors)4378 static unsigned int ata_dev_init_params(struct ata_device *dev,
4379 					u16 heads, u16 sectors)
4380 {
4381 	struct ata_taskfile tf;
4382 	unsigned int err_mask;
4383 
4384 	/* Number of sectors per track 1-255. Number of heads 1-16 */
4385 	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4386 		return AC_ERR_INVALID;
4387 
4388 	/* set up init dev params taskfile */
4389 	ata_dev_dbg(dev, "init dev params \n");
4390 
4391 	ata_tf_init(dev, &tf);
4392 	tf.command = ATA_CMD_INIT_DEV_PARAMS;
4393 	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
4394 	tf.protocol = ATA_PROT_NODATA;
4395 	tf.nsect = sectors;
4396 	tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
4397 
4398 	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4399 	/* A clean abort indicates an original or just out of spec drive
4400 	   and we should continue as we issue the setup based on the
4401 	   drive reported working geometry */
4402 	if (err_mask == AC_ERR_DEV && (tf.error & ATA_ABORTED))
4403 		err_mask = 0;
4404 
4405 	return err_mask;
4406 }
4407 
4408 /**
4409  *	atapi_check_dma - Check whether ATAPI DMA can be supported
4410  *	@qc: Metadata associated with taskfile to check
4411  *
4412  *	Allow low-level driver to filter ATA PACKET commands, returning
4413  *	a status indicating whether or not it is OK to use DMA for the
4414  *	supplied PACKET command.
4415  *
4416  *	LOCKING:
4417  *	spin_lock_irqsave(host lock)
4418  *
4419  *	RETURNS: 0 when ATAPI DMA can be used
4420  *               nonzero otherwise
4421  */
atapi_check_dma(struct ata_queued_cmd * qc)4422 int atapi_check_dma(struct ata_queued_cmd *qc)
4423 {
4424 	struct ata_port *ap = qc->ap;
4425 
4426 	/* Don't allow DMA if it isn't multiple of 16 bytes.  Quite a
4427 	 * few ATAPI devices choke on such DMA requests.
4428 	 */
4429 	if (!(qc->dev->horkage & ATA_HORKAGE_ATAPI_MOD16_DMA) &&
4430 	    unlikely(qc->nbytes & 15))
4431 		return 1;
4432 
4433 	if (ap->ops->check_atapi_dma)
4434 		return ap->ops->check_atapi_dma(qc);
4435 
4436 	return 0;
4437 }
4438 
4439 /**
4440  *	ata_std_qc_defer - Check whether a qc needs to be deferred
4441  *	@qc: ATA command in question
4442  *
4443  *	Non-NCQ commands cannot run with any other command, NCQ or
4444  *	not.  As upper layer only knows the queue depth, we are
4445  *	responsible for maintaining exclusion.  This function checks
4446  *	whether a new command @qc can be issued.
4447  *
4448  *	LOCKING:
4449  *	spin_lock_irqsave(host lock)
4450  *
4451  *	RETURNS:
4452  *	ATA_DEFER_* if deferring is needed, 0 otherwise.
4453  */
ata_std_qc_defer(struct ata_queued_cmd * qc)4454 int ata_std_qc_defer(struct ata_queued_cmd *qc)
4455 {
4456 	struct ata_link *link = qc->dev->link;
4457 
4458 	if (ata_is_ncq(qc->tf.protocol)) {
4459 		if (!ata_tag_valid(link->active_tag))
4460 			return 0;
4461 	} else {
4462 		if (!ata_tag_valid(link->active_tag) && !link->sactive)
4463 			return 0;
4464 	}
4465 
4466 	return ATA_DEFER_LINK;
4467 }
4468 EXPORT_SYMBOL_GPL(ata_std_qc_defer);
4469 
ata_noop_qc_prep(struct ata_queued_cmd * qc)4470 enum ata_completion_errors ata_noop_qc_prep(struct ata_queued_cmd *qc)
4471 {
4472 	return AC_ERR_OK;
4473 }
4474 EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
4475 
4476 /**
4477  *	ata_sg_init - Associate command with scatter-gather table.
4478  *	@qc: Command to be associated
4479  *	@sg: Scatter-gather table.
4480  *	@n_elem: Number of elements in s/g table.
4481  *
4482  *	Initialize the data-related elements of queued_cmd @qc
4483  *	to point to a scatter-gather table @sg, containing @n_elem
4484  *	elements.
4485  *
4486  *	LOCKING:
4487  *	spin_lock_irqsave(host lock)
4488  */
ata_sg_init(struct ata_queued_cmd * qc,struct scatterlist * sg,unsigned int n_elem)4489 void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
4490 		 unsigned int n_elem)
4491 {
4492 	qc->sg = sg;
4493 	qc->n_elem = n_elem;
4494 	qc->cursg = qc->sg;
4495 }
4496 
4497 #ifdef CONFIG_HAS_DMA
4498 
4499 /**
4500  *	ata_sg_clean - Unmap DMA memory associated with command
4501  *	@qc: Command containing DMA memory to be released
4502  *
4503  *	Unmap all mapped DMA memory associated with this command.
4504  *
4505  *	LOCKING:
4506  *	spin_lock_irqsave(host lock)
4507  */
ata_sg_clean(struct ata_queued_cmd * qc)4508 static void ata_sg_clean(struct ata_queued_cmd *qc)
4509 {
4510 	struct ata_port *ap = qc->ap;
4511 	struct scatterlist *sg = qc->sg;
4512 	int dir = qc->dma_dir;
4513 
4514 	WARN_ON_ONCE(sg == NULL);
4515 
4516 	if (qc->n_elem)
4517 		dma_unmap_sg(ap->dev, sg, qc->orig_n_elem, dir);
4518 
4519 	qc->flags &= ~ATA_QCFLAG_DMAMAP;
4520 	qc->sg = NULL;
4521 }
4522 
4523 /**
4524  *	ata_sg_setup - DMA-map the scatter-gather table associated with a command.
4525  *	@qc: Command with scatter-gather table to be mapped.
4526  *
4527  *	DMA-map the scatter-gather table associated with queued_cmd @qc.
4528  *
4529  *	LOCKING:
4530  *	spin_lock_irqsave(host lock)
4531  *
4532  *	RETURNS:
4533  *	Zero on success, negative on error.
4534  *
4535  */
ata_sg_setup(struct ata_queued_cmd * qc)4536 static int ata_sg_setup(struct ata_queued_cmd *qc)
4537 {
4538 	struct ata_port *ap = qc->ap;
4539 	unsigned int n_elem;
4540 
4541 	n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir);
4542 	if (n_elem < 1)
4543 		return -1;
4544 
4545 	qc->orig_n_elem = qc->n_elem;
4546 	qc->n_elem = n_elem;
4547 	qc->flags |= ATA_QCFLAG_DMAMAP;
4548 
4549 	return 0;
4550 }
4551 
4552 #else /* !CONFIG_HAS_DMA */
4553 
ata_sg_clean(struct ata_queued_cmd * qc)4554 static inline void ata_sg_clean(struct ata_queued_cmd *qc) {}
ata_sg_setup(struct ata_queued_cmd * qc)4555 static inline int ata_sg_setup(struct ata_queued_cmd *qc) { return -1; }
4556 
4557 #endif /* !CONFIG_HAS_DMA */
4558 
4559 /**
4560  *	swap_buf_le16 - swap halves of 16-bit words in place
4561  *	@buf:  Buffer to swap
4562  *	@buf_words:  Number of 16-bit words in buffer.
4563  *
4564  *	Swap halves of 16-bit words if needed to convert from
4565  *	little-endian byte order to native cpu byte order, or
4566  *	vice-versa.
4567  *
4568  *	LOCKING:
4569  *	Inherited from caller.
4570  */
swap_buf_le16(u16 * buf,unsigned int buf_words)4571 void swap_buf_le16(u16 *buf, unsigned int buf_words)
4572 {
4573 #ifdef __BIG_ENDIAN
4574 	unsigned int i;
4575 
4576 	for (i = 0; i < buf_words; i++)
4577 		buf[i] = le16_to_cpu(buf[i]);
4578 #endif /* __BIG_ENDIAN */
4579 }
4580 
4581 /**
4582  *	ata_qc_free - free unused ata_queued_cmd
4583  *	@qc: Command to complete
4584  *
4585  *	Designed to free unused ata_queued_cmd object
4586  *	in case something prevents using it.
4587  *
4588  *	LOCKING:
4589  *	spin_lock_irqsave(host lock)
4590  */
ata_qc_free(struct ata_queued_cmd * qc)4591 void ata_qc_free(struct ata_queued_cmd *qc)
4592 {
4593 	qc->flags = 0;
4594 	if (ata_tag_valid(qc->tag))
4595 		qc->tag = ATA_TAG_POISON;
4596 }
4597 
__ata_qc_complete(struct ata_queued_cmd * qc)4598 void __ata_qc_complete(struct ata_queued_cmd *qc)
4599 {
4600 	struct ata_port *ap;
4601 	struct ata_link *link;
4602 
4603 	WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4604 	WARN_ON_ONCE(!(qc->flags & ATA_QCFLAG_ACTIVE));
4605 	ap = qc->ap;
4606 	link = qc->dev->link;
4607 
4608 	if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
4609 		ata_sg_clean(qc);
4610 
4611 	/* command should be marked inactive atomically with qc completion */
4612 	if (ata_is_ncq(qc->tf.protocol)) {
4613 		link->sactive &= ~(1 << qc->hw_tag);
4614 		if (!link->sactive)
4615 			ap->nr_active_links--;
4616 	} else {
4617 		link->active_tag = ATA_TAG_POISON;
4618 		ap->nr_active_links--;
4619 	}
4620 
4621 	/* clear exclusive status */
4622 	if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
4623 		     ap->excl_link == link))
4624 		ap->excl_link = NULL;
4625 
4626 	/* atapi: mark qc as inactive to prevent the interrupt handler
4627 	 * from completing the command twice later, before the error handler
4628 	 * is called. (when rc != 0 and atapi request sense is needed)
4629 	 */
4630 	qc->flags &= ~ATA_QCFLAG_ACTIVE;
4631 	ap->qc_active &= ~(1ULL << qc->tag);
4632 
4633 	/* call completion callback */
4634 	qc->complete_fn(qc);
4635 }
4636 
fill_result_tf(struct ata_queued_cmd * qc)4637 static void fill_result_tf(struct ata_queued_cmd *qc)
4638 {
4639 	struct ata_port *ap = qc->ap;
4640 
4641 	qc->result_tf.flags = qc->tf.flags;
4642 	ap->ops->qc_fill_rtf(qc);
4643 }
4644 
ata_verify_xfer(struct ata_queued_cmd * qc)4645 static void ata_verify_xfer(struct ata_queued_cmd *qc)
4646 {
4647 	struct ata_device *dev = qc->dev;
4648 
4649 	if (!ata_is_data(qc->tf.protocol))
4650 		return;
4651 
4652 	if ((dev->mwdma_mask || dev->udma_mask) && ata_is_pio(qc->tf.protocol))
4653 		return;
4654 
4655 	dev->flags &= ~ATA_DFLAG_DUBIOUS_XFER;
4656 }
4657 
4658 /**
4659  *	ata_qc_complete - Complete an active ATA command
4660  *	@qc: Command to complete
4661  *
4662  *	Indicate to the mid and upper layers that an ATA command has
4663  *	completed, with either an ok or not-ok status.
4664  *
4665  *	Refrain from calling this function multiple times when
4666  *	successfully completing multiple NCQ commands.
4667  *	ata_qc_complete_multiple() should be used instead, which will
4668  *	properly update IRQ expect state.
4669  *
4670  *	LOCKING:
4671  *	spin_lock_irqsave(host lock)
4672  */
ata_qc_complete(struct ata_queued_cmd * qc)4673 void ata_qc_complete(struct ata_queued_cmd *qc)
4674 {
4675 	struct ata_port *ap = qc->ap;
4676 
4677 	/* Trigger the LED (if available) */
4678 	ledtrig_disk_activity(!!(qc->tf.flags & ATA_TFLAG_WRITE));
4679 
4680 	/* XXX: New EH and old EH use different mechanisms to
4681 	 * synchronize EH with regular execution path.
4682 	 *
4683 	 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
4684 	 * Normal execution path is responsible for not accessing a
4685 	 * failed qc.  libata core enforces the rule by returning NULL
4686 	 * from ata_qc_from_tag() for failed qcs.
4687 	 *
4688 	 * Old EH depends on ata_qc_complete() nullifying completion
4689 	 * requests if ATA_QCFLAG_EH_SCHEDULED is set.  Old EH does
4690 	 * not synchronize with interrupt handler.  Only PIO task is
4691 	 * taken care of.
4692 	 */
4693 	if (ap->ops->error_handler) {
4694 		struct ata_device *dev = qc->dev;
4695 		struct ata_eh_info *ehi = &dev->link->eh_info;
4696 
4697 		if (unlikely(qc->err_mask))
4698 			qc->flags |= ATA_QCFLAG_FAILED;
4699 
4700 		/*
4701 		 * Finish internal commands without any further processing
4702 		 * and always with the result TF filled.
4703 		 */
4704 		if (unlikely(ata_tag_internal(qc->tag))) {
4705 			fill_result_tf(qc);
4706 			trace_ata_qc_complete_internal(qc);
4707 			__ata_qc_complete(qc);
4708 			return;
4709 		}
4710 
4711 		/*
4712 		 * Non-internal qc has failed.  Fill the result TF and
4713 		 * summon EH.
4714 		 */
4715 		if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
4716 			fill_result_tf(qc);
4717 			trace_ata_qc_complete_failed(qc);
4718 			ata_qc_schedule_eh(qc);
4719 			return;
4720 		}
4721 
4722 		WARN_ON_ONCE(ap->pflags & ATA_PFLAG_FROZEN);
4723 
4724 		/* read result TF if requested */
4725 		if (qc->flags & ATA_QCFLAG_RESULT_TF)
4726 			fill_result_tf(qc);
4727 
4728 		trace_ata_qc_complete_done(qc);
4729 		/* Some commands need post-processing after successful
4730 		 * completion.
4731 		 */
4732 		switch (qc->tf.command) {
4733 		case ATA_CMD_SET_FEATURES:
4734 			if (qc->tf.feature != SETFEATURES_WC_ON &&
4735 			    qc->tf.feature != SETFEATURES_WC_OFF &&
4736 			    qc->tf.feature != SETFEATURES_RA_ON &&
4737 			    qc->tf.feature != SETFEATURES_RA_OFF)
4738 				break;
4739 			fallthrough;
4740 		case ATA_CMD_INIT_DEV_PARAMS: /* CHS translation changed */
4741 		case ATA_CMD_SET_MULTI: /* multi_count changed */
4742 			/* revalidate device */
4743 			ehi->dev_action[dev->devno] |= ATA_EH_REVALIDATE;
4744 			ata_port_schedule_eh(ap);
4745 			break;
4746 
4747 		case ATA_CMD_SLEEP:
4748 			dev->flags |= ATA_DFLAG_SLEEPING;
4749 			break;
4750 		}
4751 
4752 		if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
4753 			ata_verify_xfer(qc);
4754 
4755 		__ata_qc_complete(qc);
4756 	} else {
4757 		if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
4758 			return;
4759 
4760 		/* read result TF if failed or requested */
4761 		if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
4762 			fill_result_tf(qc);
4763 
4764 		__ata_qc_complete(qc);
4765 	}
4766 }
4767 EXPORT_SYMBOL_GPL(ata_qc_complete);
4768 
4769 /**
4770  *	ata_qc_get_active - get bitmask of active qcs
4771  *	@ap: port in question
4772  *
4773  *	LOCKING:
4774  *	spin_lock_irqsave(host lock)
4775  *
4776  *	RETURNS:
4777  *	Bitmask of active qcs
4778  */
ata_qc_get_active(struct ata_port * ap)4779 u64 ata_qc_get_active(struct ata_port *ap)
4780 {
4781 	u64 qc_active = ap->qc_active;
4782 
4783 	/* ATA_TAG_INTERNAL is sent to hw as tag 0 */
4784 	if (qc_active & (1ULL << ATA_TAG_INTERNAL)) {
4785 		qc_active |= (1 << 0);
4786 		qc_active &= ~(1ULL << ATA_TAG_INTERNAL);
4787 	}
4788 
4789 	return qc_active;
4790 }
4791 EXPORT_SYMBOL_GPL(ata_qc_get_active);
4792 
4793 /**
4794  *	ata_qc_issue - issue taskfile to device
4795  *	@qc: command to issue to device
4796  *
4797  *	Prepare an ATA command to submission to device.
4798  *	This includes mapping the data into a DMA-able
4799  *	area, filling in the S/G table, and finally
4800  *	writing the taskfile to hardware, starting the command.
4801  *
4802  *	LOCKING:
4803  *	spin_lock_irqsave(host lock)
4804  */
ata_qc_issue(struct ata_queued_cmd * qc)4805 void ata_qc_issue(struct ata_queued_cmd *qc)
4806 {
4807 	struct ata_port *ap = qc->ap;
4808 	struct ata_link *link = qc->dev->link;
4809 	u8 prot = qc->tf.protocol;
4810 
4811 	/* Make sure only one non-NCQ command is outstanding.  The
4812 	 * check is skipped for old EH because it reuses active qc to
4813 	 * request ATAPI sense.
4814 	 */
4815 	WARN_ON_ONCE(ap->ops->error_handler && ata_tag_valid(link->active_tag));
4816 
4817 	if (ata_is_ncq(prot)) {
4818 		WARN_ON_ONCE(link->sactive & (1 << qc->hw_tag));
4819 
4820 		if (!link->sactive)
4821 			ap->nr_active_links++;
4822 		link->sactive |= 1 << qc->hw_tag;
4823 	} else {
4824 		WARN_ON_ONCE(link->sactive);
4825 
4826 		ap->nr_active_links++;
4827 		link->active_tag = qc->tag;
4828 	}
4829 
4830 	qc->flags |= ATA_QCFLAG_ACTIVE;
4831 	ap->qc_active |= 1ULL << qc->tag;
4832 
4833 	/*
4834 	 * We guarantee to LLDs that they will have at least one
4835 	 * non-zero sg if the command is a data command.
4836 	 */
4837 	if (ata_is_data(prot) && (!qc->sg || !qc->n_elem || !qc->nbytes))
4838 		goto sys_err;
4839 
4840 	if (ata_is_dma(prot) || (ata_is_pio(prot) &&
4841 				 (ap->flags & ATA_FLAG_PIO_DMA)))
4842 		if (ata_sg_setup(qc))
4843 			goto sys_err;
4844 
4845 	/* if device is sleeping, schedule reset and abort the link */
4846 	if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
4847 		link->eh_info.action |= ATA_EH_RESET;
4848 		ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
4849 		ata_link_abort(link);
4850 		return;
4851 	}
4852 
4853 	trace_ata_qc_prep(qc);
4854 	qc->err_mask |= ap->ops->qc_prep(qc);
4855 	if (unlikely(qc->err_mask))
4856 		goto err;
4857 	trace_ata_qc_issue(qc);
4858 	qc->err_mask |= ap->ops->qc_issue(qc);
4859 	if (unlikely(qc->err_mask))
4860 		goto err;
4861 	return;
4862 
4863 sys_err:
4864 	qc->err_mask |= AC_ERR_SYSTEM;
4865 err:
4866 	ata_qc_complete(qc);
4867 }
4868 
4869 /**
4870  *	ata_phys_link_online - test whether the given link is online
4871  *	@link: ATA link to test
4872  *
4873  *	Test whether @link is online.  Note that this function returns
4874  *	0 if online status of @link cannot be obtained, so
4875  *	ata_link_online(link) != !ata_link_offline(link).
4876  *
4877  *	LOCKING:
4878  *	None.
4879  *
4880  *	RETURNS:
4881  *	True if the port online status is available and online.
4882  */
ata_phys_link_online(struct ata_link * link)4883 bool ata_phys_link_online(struct ata_link *link)
4884 {
4885 	u32 sstatus;
4886 
4887 	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
4888 	    ata_sstatus_online(sstatus))
4889 		return true;
4890 	return false;
4891 }
4892 
4893 /**
4894  *	ata_phys_link_offline - test whether the given link is offline
4895  *	@link: ATA link to test
4896  *
4897  *	Test whether @link is offline.  Note that this function
4898  *	returns 0 if offline status of @link cannot be obtained, so
4899  *	ata_link_online(link) != !ata_link_offline(link).
4900  *
4901  *	LOCKING:
4902  *	None.
4903  *
4904  *	RETURNS:
4905  *	True if the port offline status is available and offline.
4906  */
ata_phys_link_offline(struct ata_link * link)4907 bool ata_phys_link_offline(struct ata_link *link)
4908 {
4909 	u32 sstatus;
4910 
4911 	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
4912 	    !ata_sstatus_online(sstatus))
4913 		return true;
4914 	return false;
4915 }
4916 
4917 /**
4918  *	ata_link_online - test whether the given link is online
4919  *	@link: ATA link to test
4920  *
4921  *	Test whether @link is online.  This is identical to
4922  *	ata_phys_link_online() when there's no slave link.  When
4923  *	there's a slave link, this function should only be called on
4924  *	the master link and will return true if any of M/S links is
4925  *	online.
4926  *
4927  *	LOCKING:
4928  *	None.
4929  *
4930  *	RETURNS:
4931  *	True if the port online status is available and online.
4932  */
ata_link_online(struct ata_link * link)4933 bool ata_link_online(struct ata_link *link)
4934 {
4935 	struct ata_link *slave = link->ap->slave_link;
4936 
4937 	WARN_ON(link == slave);	/* shouldn't be called on slave link */
4938 
4939 	return ata_phys_link_online(link) ||
4940 		(slave && ata_phys_link_online(slave));
4941 }
4942 EXPORT_SYMBOL_GPL(ata_link_online);
4943 
4944 /**
4945  *	ata_link_offline - test whether the given link is offline
4946  *	@link: ATA link to test
4947  *
4948  *	Test whether @link is offline.  This is identical to
4949  *	ata_phys_link_offline() when there's no slave link.  When
4950  *	there's a slave link, this function should only be called on
4951  *	the master link and will return true if both M/S links are
4952  *	offline.
4953  *
4954  *	LOCKING:
4955  *	None.
4956  *
4957  *	RETURNS:
4958  *	True if the port offline status is available and offline.
4959  */
ata_link_offline(struct ata_link * link)4960 bool ata_link_offline(struct ata_link *link)
4961 {
4962 	struct ata_link *slave = link->ap->slave_link;
4963 
4964 	WARN_ON(link == slave);	/* shouldn't be called on slave link */
4965 
4966 	return ata_phys_link_offline(link) &&
4967 		(!slave || ata_phys_link_offline(slave));
4968 }
4969 EXPORT_SYMBOL_GPL(ata_link_offline);
4970 
4971 #ifdef CONFIG_PM
ata_port_request_pm(struct ata_port * ap,pm_message_t mesg,unsigned int action,unsigned int ehi_flags,bool async)4972 static void ata_port_request_pm(struct ata_port *ap, pm_message_t mesg,
4973 				unsigned int action, unsigned int ehi_flags,
4974 				bool async)
4975 {
4976 	struct ata_link *link;
4977 	unsigned long flags;
4978 
4979 	/* Previous resume operation might still be in
4980 	 * progress.  Wait for PM_PENDING to clear.
4981 	 */
4982 	if (ap->pflags & ATA_PFLAG_PM_PENDING) {
4983 		ata_port_wait_eh(ap);
4984 		WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
4985 	}
4986 
4987 	/* request PM ops to EH */
4988 	spin_lock_irqsave(ap->lock, flags);
4989 
4990 	ap->pm_mesg = mesg;
4991 	ap->pflags |= ATA_PFLAG_PM_PENDING;
4992 	ata_for_each_link(link, ap, HOST_FIRST) {
4993 		link->eh_info.action |= action;
4994 		link->eh_info.flags |= ehi_flags;
4995 	}
4996 
4997 	ata_port_schedule_eh(ap);
4998 
4999 	spin_unlock_irqrestore(ap->lock, flags);
5000 
5001 	if (!async) {
5002 		ata_port_wait_eh(ap);
5003 		WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
5004 	}
5005 }
5006 
5007 /*
5008  * On some hardware, device fails to respond after spun down for suspend.  As
5009  * the device won't be used before being resumed, we don't need to touch the
5010  * device.  Ask EH to skip the usual stuff and proceed directly to suspend.
5011  *
5012  * http://thread.gmane.org/gmane.linux.ide/46764
5013  */
5014 static const unsigned int ata_port_suspend_ehi = ATA_EHI_QUIET
5015 						 | ATA_EHI_NO_AUTOPSY
5016 						 | ATA_EHI_NO_RECOVERY;
5017 
ata_port_suspend(struct ata_port * ap,pm_message_t mesg)5018 static void ata_port_suspend(struct ata_port *ap, pm_message_t mesg)
5019 {
5020 	ata_port_request_pm(ap, mesg, 0, ata_port_suspend_ehi, false);
5021 }
5022 
ata_port_suspend_async(struct ata_port * ap,pm_message_t mesg)5023 static void ata_port_suspend_async(struct ata_port *ap, pm_message_t mesg)
5024 {
5025 	ata_port_request_pm(ap, mesg, 0, ata_port_suspend_ehi, true);
5026 }
5027 
ata_port_pm_suspend(struct device * dev)5028 static int ata_port_pm_suspend(struct device *dev)
5029 {
5030 	struct ata_port *ap = to_ata_port(dev);
5031 
5032 	if (pm_runtime_suspended(dev))
5033 		return 0;
5034 
5035 	ata_port_suspend(ap, PMSG_SUSPEND);
5036 	return 0;
5037 }
5038 
ata_port_pm_freeze(struct device * dev)5039 static int ata_port_pm_freeze(struct device *dev)
5040 {
5041 	struct ata_port *ap = to_ata_port(dev);
5042 
5043 	if (pm_runtime_suspended(dev))
5044 		return 0;
5045 
5046 	ata_port_suspend(ap, PMSG_FREEZE);
5047 	return 0;
5048 }
5049 
ata_port_pm_poweroff(struct device * dev)5050 static int ata_port_pm_poweroff(struct device *dev)
5051 {
5052 	ata_port_suspend(to_ata_port(dev), PMSG_HIBERNATE);
5053 	return 0;
5054 }
5055 
5056 static const unsigned int ata_port_resume_ehi = ATA_EHI_NO_AUTOPSY
5057 						| ATA_EHI_QUIET;
5058 
ata_port_resume(struct ata_port * ap,pm_message_t mesg)5059 static void ata_port_resume(struct ata_port *ap, pm_message_t mesg)
5060 {
5061 	ata_port_request_pm(ap, mesg, ATA_EH_RESET, ata_port_resume_ehi, false);
5062 }
5063 
ata_port_resume_async(struct ata_port * ap,pm_message_t mesg)5064 static void ata_port_resume_async(struct ata_port *ap, pm_message_t mesg)
5065 {
5066 	ata_port_request_pm(ap, mesg, ATA_EH_RESET, ata_port_resume_ehi, true);
5067 }
5068 
ata_port_pm_resume(struct device * dev)5069 static int ata_port_pm_resume(struct device *dev)
5070 {
5071 	ata_port_resume_async(to_ata_port(dev), PMSG_RESUME);
5072 	pm_runtime_disable(dev);
5073 	pm_runtime_set_active(dev);
5074 	pm_runtime_enable(dev);
5075 	return 0;
5076 }
5077 
5078 /*
5079  * For ODDs, the upper layer will poll for media change every few seconds,
5080  * which will make it enter and leave suspend state every few seconds. And
5081  * as each suspend will cause a hard/soft reset, the gain of runtime suspend
5082  * is very little and the ODD may malfunction after constantly being reset.
5083  * So the idle callback here will not proceed to suspend if a non-ZPODD capable
5084  * ODD is attached to the port.
5085  */
ata_port_runtime_idle(struct device * dev)5086 static int ata_port_runtime_idle(struct device *dev)
5087 {
5088 	struct ata_port *ap = to_ata_port(dev);
5089 	struct ata_link *link;
5090 	struct ata_device *adev;
5091 
5092 	ata_for_each_link(link, ap, HOST_FIRST) {
5093 		ata_for_each_dev(adev, link, ENABLED)
5094 			if (adev->class == ATA_DEV_ATAPI &&
5095 			    !zpodd_dev_enabled(adev))
5096 				return -EBUSY;
5097 	}
5098 
5099 	return 0;
5100 }
5101 
ata_port_runtime_suspend(struct device * dev)5102 static int ata_port_runtime_suspend(struct device *dev)
5103 {
5104 	ata_port_suspend(to_ata_port(dev), PMSG_AUTO_SUSPEND);
5105 	return 0;
5106 }
5107 
ata_port_runtime_resume(struct device * dev)5108 static int ata_port_runtime_resume(struct device *dev)
5109 {
5110 	ata_port_resume(to_ata_port(dev), PMSG_AUTO_RESUME);
5111 	return 0;
5112 }
5113 
5114 static const struct dev_pm_ops ata_port_pm_ops = {
5115 	.suspend = ata_port_pm_suspend,
5116 	.resume = ata_port_pm_resume,
5117 	.freeze = ata_port_pm_freeze,
5118 	.thaw = ata_port_pm_resume,
5119 	.poweroff = ata_port_pm_poweroff,
5120 	.restore = ata_port_pm_resume,
5121 
5122 	.runtime_suspend = ata_port_runtime_suspend,
5123 	.runtime_resume = ata_port_runtime_resume,
5124 	.runtime_idle = ata_port_runtime_idle,
5125 };
5126 
5127 /* sas ports don't participate in pm runtime management of ata_ports,
5128  * and need to resume ata devices at the domain level, not the per-port
5129  * level. sas suspend/resume is async to allow parallel port recovery
5130  * since sas has multiple ata_port instances per Scsi_Host.
5131  */
ata_sas_port_suspend(struct ata_port * ap)5132 void ata_sas_port_suspend(struct ata_port *ap)
5133 {
5134 	ata_port_suspend_async(ap, PMSG_SUSPEND);
5135 }
5136 EXPORT_SYMBOL_GPL(ata_sas_port_suspend);
5137 
ata_sas_port_resume(struct ata_port * ap)5138 void ata_sas_port_resume(struct ata_port *ap)
5139 {
5140 	ata_port_resume_async(ap, PMSG_RESUME);
5141 }
5142 EXPORT_SYMBOL_GPL(ata_sas_port_resume);
5143 
5144 /**
5145  *	ata_host_suspend - suspend host
5146  *	@host: host to suspend
5147  *	@mesg: PM message
5148  *
5149  *	Suspend @host.  Actual operation is performed by port suspend.
5150  */
ata_host_suspend(struct ata_host * host,pm_message_t mesg)5151 void ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5152 {
5153 	host->dev->power.power_state = mesg;
5154 }
5155 EXPORT_SYMBOL_GPL(ata_host_suspend);
5156 
5157 /**
5158  *	ata_host_resume - resume host
5159  *	@host: host to resume
5160  *
5161  *	Resume @host.  Actual operation is performed by port resume.
5162  */
ata_host_resume(struct ata_host * host)5163 void ata_host_resume(struct ata_host *host)
5164 {
5165 	host->dev->power.power_state = PMSG_ON;
5166 }
5167 EXPORT_SYMBOL_GPL(ata_host_resume);
5168 #endif
5169 
5170 const struct device_type ata_port_type = {
5171 	.name = "ata_port",
5172 #ifdef CONFIG_PM
5173 	.pm = &ata_port_pm_ops,
5174 #endif
5175 };
5176 
5177 /**
5178  *	ata_dev_init - Initialize an ata_device structure
5179  *	@dev: Device structure to initialize
5180  *
5181  *	Initialize @dev in preparation for probing.
5182  *
5183  *	LOCKING:
5184  *	Inherited from caller.
5185  */
ata_dev_init(struct ata_device * dev)5186 void ata_dev_init(struct ata_device *dev)
5187 {
5188 	struct ata_link *link = ata_dev_phys_link(dev);
5189 	struct ata_port *ap = link->ap;
5190 	unsigned long flags;
5191 
5192 	/* SATA spd limit is bound to the attached device, reset together */
5193 	link->sata_spd_limit = link->hw_sata_spd_limit;
5194 	link->sata_spd = 0;
5195 
5196 	/* High bits of dev->flags are used to record warm plug
5197 	 * requests which occur asynchronously.  Synchronize using
5198 	 * host lock.
5199 	 */
5200 	spin_lock_irqsave(ap->lock, flags);
5201 	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5202 	dev->horkage = 0;
5203 	spin_unlock_irqrestore(ap->lock, flags);
5204 
5205 	memset((void *)dev + ATA_DEVICE_CLEAR_BEGIN, 0,
5206 	       ATA_DEVICE_CLEAR_END - ATA_DEVICE_CLEAR_BEGIN);
5207 	dev->pio_mask = UINT_MAX;
5208 	dev->mwdma_mask = UINT_MAX;
5209 	dev->udma_mask = UINT_MAX;
5210 }
5211 
5212 /**
5213  *	ata_link_init - Initialize an ata_link structure
5214  *	@ap: ATA port link is attached to
5215  *	@link: Link structure to initialize
5216  *	@pmp: Port multiplier port number
5217  *
5218  *	Initialize @link.
5219  *
5220  *	LOCKING:
5221  *	Kernel thread context (may sleep)
5222  */
ata_link_init(struct ata_port * ap,struct ata_link * link,int pmp)5223 void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
5224 {
5225 	int i;
5226 
5227 	/* clear everything except for devices */
5228 	memset((void *)link + ATA_LINK_CLEAR_BEGIN, 0,
5229 	       ATA_LINK_CLEAR_END - ATA_LINK_CLEAR_BEGIN);
5230 
5231 	link->ap = ap;
5232 	link->pmp = pmp;
5233 	link->active_tag = ATA_TAG_POISON;
5234 	link->hw_sata_spd_limit = UINT_MAX;
5235 
5236 	/* can't use iterator, ap isn't initialized yet */
5237 	for (i = 0; i < ATA_MAX_DEVICES; i++) {
5238 		struct ata_device *dev = &link->device[i];
5239 
5240 		dev->link = link;
5241 		dev->devno = dev - link->device;
5242 #ifdef CONFIG_ATA_ACPI
5243 		dev->gtf_filter = ata_acpi_gtf_filter;
5244 #endif
5245 		ata_dev_init(dev);
5246 	}
5247 }
5248 
5249 /**
5250  *	sata_link_init_spd - Initialize link->sata_spd_limit
5251  *	@link: Link to configure sata_spd_limit for
5252  *
5253  *	Initialize ``link->[hw_]sata_spd_limit`` to the currently
5254  *	configured value.
5255  *
5256  *	LOCKING:
5257  *	Kernel thread context (may sleep).
5258  *
5259  *	RETURNS:
5260  *	0 on success, -errno on failure.
5261  */
sata_link_init_spd(struct ata_link * link)5262 int sata_link_init_spd(struct ata_link *link)
5263 {
5264 	u8 spd;
5265 	int rc;
5266 
5267 	rc = sata_scr_read(link, SCR_CONTROL, &link->saved_scontrol);
5268 	if (rc)
5269 		return rc;
5270 
5271 	spd = (link->saved_scontrol >> 4) & 0xf;
5272 	if (spd)
5273 		link->hw_sata_spd_limit &= (1 << spd) - 1;
5274 
5275 	ata_force_link_limits(link);
5276 
5277 	link->sata_spd_limit = link->hw_sata_spd_limit;
5278 
5279 	return 0;
5280 }
5281 
5282 /**
5283  *	ata_port_alloc - allocate and initialize basic ATA port resources
5284  *	@host: ATA host this allocated port belongs to
5285  *
5286  *	Allocate and initialize basic ATA port resources.
5287  *
5288  *	RETURNS:
5289  *	Allocate ATA port on success, NULL on failure.
5290  *
5291  *	LOCKING:
5292  *	Inherited from calling layer (may sleep).
5293  */
ata_port_alloc(struct ata_host * host)5294 struct ata_port *ata_port_alloc(struct ata_host *host)
5295 {
5296 	struct ata_port *ap;
5297 
5298 	ap = kzalloc(sizeof(*ap), GFP_KERNEL);
5299 	if (!ap)
5300 		return NULL;
5301 
5302 	ap->pflags |= ATA_PFLAG_INITIALIZING | ATA_PFLAG_FROZEN;
5303 	ap->lock = &host->lock;
5304 	ap->print_id = -1;
5305 	ap->local_port_no = -1;
5306 	ap->host = host;
5307 	ap->dev = host->dev;
5308 
5309 	mutex_init(&ap->scsi_scan_mutex);
5310 	INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
5311 	INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
5312 	INIT_LIST_HEAD(&ap->eh_done_q);
5313 	init_waitqueue_head(&ap->eh_wait_q);
5314 	init_completion(&ap->park_req_pending);
5315 	timer_setup(&ap->fastdrain_timer, ata_eh_fastdrain_timerfn,
5316 		    TIMER_DEFERRABLE);
5317 
5318 	ap->cbl = ATA_CBL_NONE;
5319 
5320 	ata_link_init(ap, &ap->link, 0);
5321 
5322 #ifdef ATA_IRQ_TRAP
5323 	ap->stats.unhandled_irq = 1;
5324 	ap->stats.idle_irq = 1;
5325 #endif
5326 	ata_sff_port_init(ap);
5327 
5328 	return ap;
5329 }
5330 
ata_devres_release(struct device * gendev,void * res)5331 static void ata_devres_release(struct device *gendev, void *res)
5332 {
5333 	struct ata_host *host = dev_get_drvdata(gendev);
5334 	int i;
5335 
5336 	for (i = 0; i < host->n_ports; i++) {
5337 		struct ata_port *ap = host->ports[i];
5338 
5339 		if (!ap)
5340 			continue;
5341 
5342 		if (ap->scsi_host)
5343 			scsi_host_put(ap->scsi_host);
5344 
5345 	}
5346 
5347 	dev_set_drvdata(gendev, NULL);
5348 	ata_host_put(host);
5349 }
5350 
ata_host_release(struct kref * kref)5351 static void ata_host_release(struct kref *kref)
5352 {
5353 	struct ata_host *host = container_of(kref, struct ata_host, kref);
5354 	int i;
5355 
5356 	for (i = 0; i < host->n_ports; i++) {
5357 		struct ata_port *ap = host->ports[i];
5358 
5359 		kfree(ap->pmp_link);
5360 		kfree(ap->slave_link);
5361 		kfree(ap);
5362 		host->ports[i] = NULL;
5363 	}
5364 	kfree(host);
5365 }
5366 
ata_host_get(struct ata_host * host)5367 void ata_host_get(struct ata_host *host)
5368 {
5369 	kref_get(&host->kref);
5370 }
5371 
ata_host_put(struct ata_host * host)5372 void ata_host_put(struct ata_host *host)
5373 {
5374 	kref_put(&host->kref, ata_host_release);
5375 }
5376 EXPORT_SYMBOL_GPL(ata_host_put);
5377 
5378 /**
5379  *	ata_host_alloc - allocate and init basic ATA host resources
5380  *	@dev: generic device this host is associated with
5381  *	@max_ports: maximum number of ATA ports associated with this host
5382  *
5383  *	Allocate and initialize basic ATA host resources.  LLD calls
5384  *	this function to allocate a host, initializes it fully and
5385  *	attaches it using ata_host_register().
5386  *
5387  *	@max_ports ports are allocated and host->n_ports is
5388  *	initialized to @max_ports.  The caller is allowed to decrease
5389  *	host->n_ports before calling ata_host_register().  The unused
5390  *	ports will be automatically freed on registration.
5391  *
5392  *	RETURNS:
5393  *	Allocate ATA host on success, NULL on failure.
5394  *
5395  *	LOCKING:
5396  *	Inherited from calling layer (may sleep).
5397  */
ata_host_alloc(struct device * dev,int max_ports)5398 struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
5399 {
5400 	struct ata_host *host;
5401 	size_t sz;
5402 	int i;
5403 	void *dr;
5404 
5405 	/* alloc a container for our list of ATA ports (buses) */
5406 	sz = sizeof(struct ata_host) + (max_ports + 1) * sizeof(void *);
5407 	host = kzalloc(sz, GFP_KERNEL);
5408 	if (!host)
5409 		return NULL;
5410 
5411 	if (!devres_open_group(dev, NULL, GFP_KERNEL))
5412 		goto err_free;
5413 
5414 	dr = devres_alloc(ata_devres_release, 0, GFP_KERNEL);
5415 	if (!dr)
5416 		goto err_out;
5417 
5418 	devres_add(dev, dr);
5419 	dev_set_drvdata(dev, host);
5420 
5421 	spin_lock_init(&host->lock);
5422 	mutex_init(&host->eh_mutex);
5423 	host->dev = dev;
5424 	host->n_ports = max_ports;
5425 	kref_init(&host->kref);
5426 
5427 	/* allocate ports bound to this host */
5428 	for (i = 0; i < max_ports; i++) {
5429 		struct ata_port *ap;
5430 
5431 		ap = ata_port_alloc(host);
5432 		if (!ap)
5433 			goto err_out;
5434 
5435 		ap->port_no = i;
5436 		host->ports[i] = ap;
5437 	}
5438 
5439 	devres_remove_group(dev, NULL);
5440 	return host;
5441 
5442  err_out:
5443 	devres_release_group(dev, NULL);
5444  err_free:
5445 	kfree(host);
5446 	return NULL;
5447 }
5448 EXPORT_SYMBOL_GPL(ata_host_alloc);
5449 
5450 /**
5451  *	ata_host_alloc_pinfo - alloc host and init with port_info array
5452  *	@dev: generic device this host is associated with
5453  *	@ppi: array of ATA port_info to initialize host with
5454  *	@n_ports: number of ATA ports attached to this host
5455  *
5456  *	Allocate ATA host and initialize with info from @ppi.  If NULL
5457  *	terminated, @ppi may contain fewer entries than @n_ports.  The
5458  *	last entry will be used for the remaining ports.
5459  *
5460  *	RETURNS:
5461  *	Allocate ATA host on success, NULL on failure.
5462  *
5463  *	LOCKING:
5464  *	Inherited from calling layer (may sleep).
5465  */
ata_host_alloc_pinfo(struct device * dev,const struct ata_port_info * const * ppi,int n_ports)5466 struct ata_host *ata_host_alloc_pinfo(struct device *dev,
5467 				      const struct ata_port_info * const * ppi,
5468 				      int n_ports)
5469 {
5470 	const struct ata_port_info *pi = &ata_dummy_port_info;
5471 	struct ata_host *host;
5472 	int i, j;
5473 
5474 	host = ata_host_alloc(dev, n_ports);
5475 	if (!host)
5476 		return NULL;
5477 
5478 	for (i = 0, j = 0; i < host->n_ports; i++) {
5479 		struct ata_port *ap = host->ports[i];
5480 
5481 		if (ppi[j])
5482 			pi = ppi[j++];
5483 
5484 		ap->pio_mask = pi->pio_mask;
5485 		ap->mwdma_mask = pi->mwdma_mask;
5486 		ap->udma_mask = pi->udma_mask;
5487 		ap->flags |= pi->flags;
5488 		ap->link.flags |= pi->link_flags;
5489 		ap->ops = pi->port_ops;
5490 
5491 		if (!host->ops && (pi->port_ops != &ata_dummy_port_ops))
5492 			host->ops = pi->port_ops;
5493 	}
5494 
5495 	return host;
5496 }
5497 EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
5498 
ata_host_stop(struct device * gendev,void * res)5499 static void ata_host_stop(struct device *gendev, void *res)
5500 {
5501 	struct ata_host *host = dev_get_drvdata(gendev);
5502 	int i;
5503 
5504 	WARN_ON(!(host->flags & ATA_HOST_STARTED));
5505 
5506 	for (i = 0; i < host->n_ports; i++) {
5507 		struct ata_port *ap = host->ports[i];
5508 
5509 		if (ap->ops->port_stop)
5510 			ap->ops->port_stop(ap);
5511 	}
5512 
5513 	if (host->ops->host_stop)
5514 		host->ops->host_stop(host);
5515 }
5516 
5517 /**
5518  *	ata_finalize_port_ops - finalize ata_port_operations
5519  *	@ops: ata_port_operations to finalize
5520  *
5521  *	An ata_port_operations can inherit from another ops and that
5522  *	ops can again inherit from another.  This can go on as many
5523  *	times as necessary as long as there is no loop in the
5524  *	inheritance chain.
5525  *
5526  *	Ops tables are finalized when the host is started.  NULL or
5527  *	unspecified entries are inherited from the closet ancestor
5528  *	which has the method and the entry is populated with it.
5529  *	After finalization, the ops table directly points to all the
5530  *	methods and ->inherits is no longer necessary and cleared.
5531  *
5532  *	Using ATA_OP_NULL, inheriting ops can force a method to NULL.
5533  *
5534  *	LOCKING:
5535  *	None.
5536  */
ata_finalize_port_ops(struct ata_port_operations * ops)5537 static void ata_finalize_port_ops(struct ata_port_operations *ops)
5538 {
5539 	static DEFINE_SPINLOCK(lock);
5540 	const struct ata_port_operations *cur;
5541 	void **begin = (void **)ops;
5542 	void **end = (void **)&ops->inherits;
5543 	void **pp;
5544 
5545 	if (!ops || !ops->inherits)
5546 		return;
5547 
5548 	spin_lock(&lock);
5549 
5550 	for (cur = ops->inherits; cur; cur = cur->inherits) {
5551 		void **inherit = (void **)cur;
5552 
5553 		for (pp = begin; pp < end; pp++, inherit++)
5554 			if (!*pp)
5555 				*pp = *inherit;
5556 	}
5557 
5558 	for (pp = begin; pp < end; pp++)
5559 		if (IS_ERR(*pp))
5560 			*pp = NULL;
5561 
5562 	ops->inherits = NULL;
5563 
5564 	spin_unlock(&lock);
5565 }
5566 
5567 /**
5568  *	ata_host_start - start and freeze ports of an ATA host
5569  *	@host: ATA host to start ports for
5570  *
5571  *	Start and then freeze ports of @host.  Started status is
5572  *	recorded in host->flags, so this function can be called
5573  *	multiple times.  Ports are guaranteed to get started only
5574  *	once.  If host->ops is not initialized yet, it is set to the
5575  *	first non-dummy port ops.
5576  *
5577  *	LOCKING:
5578  *	Inherited from calling layer (may sleep).
5579  *
5580  *	RETURNS:
5581  *	0 if all ports are started successfully, -errno otherwise.
5582  */
ata_host_start(struct ata_host * host)5583 int ata_host_start(struct ata_host *host)
5584 {
5585 	int have_stop = 0;
5586 	void *start_dr = NULL;
5587 	int i, rc;
5588 
5589 	if (host->flags & ATA_HOST_STARTED)
5590 		return 0;
5591 
5592 	ata_finalize_port_ops(host->ops);
5593 
5594 	for (i = 0; i < host->n_ports; i++) {
5595 		struct ata_port *ap = host->ports[i];
5596 
5597 		ata_finalize_port_ops(ap->ops);
5598 
5599 		if (!host->ops && !ata_port_is_dummy(ap))
5600 			host->ops = ap->ops;
5601 
5602 		if (ap->ops->port_stop)
5603 			have_stop = 1;
5604 	}
5605 
5606 	if (host->ops && host->ops->host_stop)
5607 		have_stop = 1;
5608 
5609 	if (have_stop) {
5610 		start_dr = devres_alloc(ata_host_stop, 0, GFP_KERNEL);
5611 		if (!start_dr)
5612 			return -ENOMEM;
5613 	}
5614 
5615 	for (i = 0; i < host->n_ports; i++) {
5616 		struct ata_port *ap = host->ports[i];
5617 
5618 		if (ap->ops->port_start) {
5619 			rc = ap->ops->port_start(ap);
5620 			if (rc) {
5621 				if (rc != -ENODEV)
5622 					dev_err(host->dev,
5623 						"failed to start port %d (errno=%d)\n",
5624 						i, rc);
5625 				goto err_out;
5626 			}
5627 		}
5628 		ata_eh_freeze_port(ap);
5629 	}
5630 
5631 	if (start_dr)
5632 		devres_add(host->dev, start_dr);
5633 	host->flags |= ATA_HOST_STARTED;
5634 	return 0;
5635 
5636  err_out:
5637 	while (--i >= 0) {
5638 		struct ata_port *ap = host->ports[i];
5639 
5640 		if (ap->ops->port_stop)
5641 			ap->ops->port_stop(ap);
5642 	}
5643 	devres_free(start_dr);
5644 	return rc;
5645 }
5646 EXPORT_SYMBOL_GPL(ata_host_start);
5647 
5648 /**
5649  *	ata_host_init - Initialize a host struct for sas (ipr, libsas)
5650  *	@host:	host to initialize
5651  *	@dev:	device host is attached to
5652  *	@ops:	port_ops
5653  *
5654  */
ata_host_init(struct ata_host * host,struct device * dev,struct ata_port_operations * ops)5655 void ata_host_init(struct ata_host *host, struct device *dev,
5656 		   struct ata_port_operations *ops)
5657 {
5658 	spin_lock_init(&host->lock);
5659 	mutex_init(&host->eh_mutex);
5660 	host->n_tags = ATA_MAX_QUEUE;
5661 	host->dev = dev;
5662 	host->ops = ops;
5663 	kref_init(&host->kref);
5664 }
5665 EXPORT_SYMBOL_GPL(ata_host_init);
5666 
__ata_port_probe(struct ata_port * ap)5667 void __ata_port_probe(struct ata_port *ap)
5668 {
5669 	struct ata_eh_info *ehi = &ap->link.eh_info;
5670 	unsigned long flags;
5671 
5672 	/* kick EH for boot probing */
5673 	spin_lock_irqsave(ap->lock, flags);
5674 
5675 	ehi->probe_mask |= ATA_ALL_DEVICES;
5676 	ehi->action |= ATA_EH_RESET;
5677 	ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
5678 
5679 	ap->pflags &= ~ATA_PFLAG_INITIALIZING;
5680 	ap->pflags |= ATA_PFLAG_LOADING;
5681 	ata_port_schedule_eh(ap);
5682 
5683 	spin_unlock_irqrestore(ap->lock, flags);
5684 }
5685 
ata_port_probe(struct ata_port * ap)5686 int ata_port_probe(struct ata_port *ap)
5687 {
5688 	int rc = 0;
5689 
5690 	if (ap->ops->error_handler) {
5691 		__ata_port_probe(ap);
5692 		ata_port_wait_eh(ap);
5693 	} else {
5694 		rc = ata_bus_probe(ap);
5695 	}
5696 	return rc;
5697 }
5698 
5699 
async_port_probe(void * data,async_cookie_t cookie)5700 static void async_port_probe(void *data, async_cookie_t cookie)
5701 {
5702 	struct ata_port *ap = data;
5703 
5704 	/*
5705 	 * If we're not allowed to scan this host in parallel,
5706 	 * we need to wait until all previous scans have completed
5707 	 * before going further.
5708 	 * Jeff Garzik says this is only within a controller, so we
5709 	 * don't need to wait for port 0, only for later ports.
5710 	 */
5711 	if (!(ap->host->flags & ATA_HOST_PARALLEL_SCAN) && ap->port_no != 0)
5712 		async_synchronize_cookie(cookie);
5713 
5714 	(void)ata_port_probe(ap);
5715 
5716 	/* in order to keep device order, we need to synchronize at this point */
5717 	async_synchronize_cookie(cookie);
5718 
5719 	ata_scsi_scan_host(ap, 1);
5720 }
5721 
5722 /**
5723  *	ata_host_register - register initialized ATA host
5724  *	@host: ATA host to register
5725  *	@sht: template for SCSI host
5726  *
5727  *	Register initialized ATA host.  @host is allocated using
5728  *	ata_host_alloc() and fully initialized by LLD.  This function
5729  *	starts ports, registers @host with ATA and SCSI layers and
5730  *	probe registered devices.
5731  *
5732  *	LOCKING:
5733  *	Inherited from calling layer (may sleep).
5734  *
5735  *	RETURNS:
5736  *	0 on success, -errno otherwise.
5737  */
ata_host_register(struct ata_host * host,struct scsi_host_template * sht)5738 int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
5739 {
5740 	int i, rc;
5741 
5742 	host->n_tags = clamp(sht->can_queue, 1, ATA_MAX_QUEUE);
5743 
5744 	/* host must have been started */
5745 	if (!(host->flags & ATA_HOST_STARTED)) {
5746 		dev_err(host->dev, "BUG: trying to register unstarted host\n");
5747 		WARN_ON(1);
5748 		return -EINVAL;
5749 	}
5750 
5751 	/* Blow away unused ports.  This happens when LLD can't
5752 	 * determine the exact number of ports to allocate at
5753 	 * allocation time.
5754 	 */
5755 	for (i = host->n_ports; host->ports[i]; i++)
5756 		kfree(host->ports[i]);
5757 
5758 	/* give ports names and add SCSI hosts */
5759 	for (i = 0; i < host->n_ports; i++) {
5760 		host->ports[i]->print_id = atomic_inc_return(&ata_print_id);
5761 		host->ports[i]->local_port_no = i + 1;
5762 	}
5763 
5764 	/* Create associated sysfs transport objects  */
5765 	for (i = 0; i < host->n_ports; i++) {
5766 		rc = ata_tport_add(host->dev,host->ports[i]);
5767 		if (rc) {
5768 			goto err_tadd;
5769 		}
5770 	}
5771 
5772 	rc = ata_scsi_add_hosts(host, sht);
5773 	if (rc)
5774 		goto err_tadd;
5775 
5776 	/* set cable, sata_spd_limit and report */
5777 	for (i = 0; i < host->n_ports; i++) {
5778 		struct ata_port *ap = host->ports[i];
5779 		unsigned long xfer_mask;
5780 
5781 		/* set SATA cable type if still unset */
5782 		if (ap->cbl == ATA_CBL_NONE && (ap->flags & ATA_FLAG_SATA))
5783 			ap->cbl = ATA_CBL_SATA;
5784 
5785 		/* init sata_spd_limit to the current value */
5786 		sata_link_init_spd(&ap->link);
5787 		if (ap->slave_link)
5788 			sata_link_init_spd(ap->slave_link);
5789 
5790 		/* print per-port info to dmesg */
5791 		xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
5792 					      ap->udma_mask);
5793 
5794 		if (!ata_port_is_dummy(ap)) {
5795 			ata_port_info(ap, "%cATA max %s %s\n",
5796 				      (ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
5797 				      ata_mode_string(xfer_mask),
5798 				      ap->link.eh_info.desc);
5799 			ata_ehi_clear_desc(&ap->link.eh_info);
5800 		} else
5801 			ata_port_info(ap, "DUMMY\n");
5802 	}
5803 
5804 	/* perform each probe asynchronously */
5805 	for (i = 0; i < host->n_ports; i++) {
5806 		struct ata_port *ap = host->ports[i];
5807 		ap->cookie = async_schedule(async_port_probe, ap);
5808 	}
5809 
5810 	return 0;
5811 
5812  err_tadd:
5813 	while (--i >= 0) {
5814 		ata_tport_delete(host->ports[i]);
5815 	}
5816 	return rc;
5817 
5818 }
5819 EXPORT_SYMBOL_GPL(ata_host_register);
5820 
5821 /**
5822  *	ata_host_activate - start host, request IRQ and register it
5823  *	@host: target ATA host
5824  *	@irq: IRQ to request
5825  *	@irq_handler: irq_handler used when requesting IRQ
5826  *	@irq_flags: irq_flags used when requesting IRQ
5827  *	@sht: scsi_host_template to use when registering the host
5828  *
5829  *	After allocating an ATA host and initializing it, most libata
5830  *	LLDs perform three steps to activate the host - start host,
5831  *	request IRQ and register it.  This helper takes necessary
5832  *	arguments and performs the three steps in one go.
5833  *
5834  *	An invalid IRQ skips the IRQ registration and expects the host to
5835  *	have set polling mode on the port. In this case, @irq_handler
5836  *	should be NULL.
5837  *
5838  *	LOCKING:
5839  *	Inherited from calling layer (may sleep).
5840  *
5841  *	RETURNS:
5842  *	0 on success, -errno otherwise.
5843  */
ata_host_activate(struct ata_host * host,int irq,irq_handler_t irq_handler,unsigned long irq_flags,struct scsi_host_template * sht)5844 int ata_host_activate(struct ata_host *host, int irq,
5845 		      irq_handler_t irq_handler, unsigned long irq_flags,
5846 		      struct scsi_host_template *sht)
5847 {
5848 	int i, rc;
5849 	char *irq_desc;
5850 
5851 	rc = ata_host_start(host);
5852 	if (rc)
5853 		return rc;
5854 
5855 	/* Special case for polling mode */
5856 	if (!irq) {
5857 		WARN_ON(irq_handler);
5858 		return ata_host_register(host, sht);
5859 	}
5860 
5861 	irq_desc = devm_kasprintf(host->dev, GFP_KERNEL, "%s[%s]",
5862 				  dev_driver_string(host->dev),
5863 				  dev_name(host->dev));
5864 	if (!irq_desc)
5865 		return -ENOMEM;
5866 
5867 	rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
5868 			      irq_desc, host);
5869 	if (rc)
5870 		return rc;
5871 
5872 	for (i = 0; i < host->n_ports; i++)
5873 		ata_port_desc(host->ports[i], "irq %d", irq);
5874 
5875 	rc = ata_host_register(host, sht);
5876 	/* if failed, just free the IRQ and leave ports alone */
5877 	if (rc)
5878 		devm_free_irq(host->dev, irq, host);
5879 
5880 	return rc;
5881 }
5882 EXPORT_SYMBOL_GPL(ata_host_activate);
5883 
5884 /**
5885  *	ata_port_detach - Detach ATA port in preparation of device removal
5886  *	@ap: ATA port to be detached
5887  *
5888  *	Detach all ATA devices and the associated SCSI devices of @ap;
5889  *	then, remove the associated SCSI host.  @ap is guaranteed to
5890  *	be quiescent on return from this function.
5891  *
5892  *	LOCKING:
5893  *	Kernel thread context (may sleep).
5894  */
ata_port_detach(struct ata_port * ap)5895 static void ata_port_detach(struct ata_port *ap)
5896 {
5897 	unsigned long flags;
5898 	struct ata_link *link;
5899 	struct ata_device *dev;
5900 
5901 	if (!ap->ops->error_handler)
5902 		goto skip_eh;
5903 
5904 	/* tell EH we're leaving & flush EH */
5905 	spin_lock_irqsave(ap->lock, flags);
5906 	ap->pflags |= ATA_PFLAG_UNLOADING;
5907 	ata_port_schedule_eh(ap);
5908 	spin_unlock_irqrestore(ap->lock, flags);
5909 
5910 	/* wait till EH commits suicide */
5911 	ata_port_wait_eh(ap);
5912 
5913 	/* it better be dead now */
5914 	WARN_ON(!(ap->pflags & ATA_PFLAG_UNLOADED));
5915 
5916 	cancel_delayed_work_sync(&ap->hotplug_task);
5917 
5918  skip_eh:
5919 	/* clean up zpodd on port removal */
5920 	ata_for_each_link(link, ap, HOST_FIRST) {
5921 		ata_for_each_dev(dev, link, ALL) {
5922 			if (zpodd_dev_enabled(dev))
5923 				zpodd_exit(dev);
5924 		}
5925 	}
5926 	if (ap->pmp_link) {
5927 		int i;
5928 		for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
5929 			ata_tlink_delete(&ap->pmp_link[i]);
5930 	}
5931 	/* remove the associated SCSI host */
5932 	scsi_remove_host(ap->scsi_host);
5933 	ata_tport_delete(ap);
5934 }
5935 
5936 /**
5937  *	ata_host_detach - Detach all ports of an ATA host
5938  *	@host: Host to detach
5939  *
5940  *	Detach all ports of @host.
5941  *
5942  *	LOCKING:
5943  *	Kernel thread context (may sleep).
5944  */
ata_host_detach(struct ata_host * host)5945 void ata_host_detach(struct ata_host *host)
5946 {
5947 	int i;
5948 
5949 	for (i = 0; i < host->n_ports; i++) {
5950 		/* Ensure ata_port probe has completed */
5951 		async_synchronize_cookie(host->ports[i]->cookie + 1);
5952 		ata_port_detach(host->ports[i]);
5953 	}
5954 
5955 	/* the host is dead now, dissociate ACPI */
5956 	ata_acpi_dissociate(host);
5957 }
5958 EXPORT_SYMBOL_GPL(ata_host_detach);
5959 
5960 #ifdef CONFIG_PCI
5961 
5962 /**
5963  *	ata_pci_remove_one - PCI layer callback for device removal
5964  *	@pdev: PCI device that was removed
5965  *
5966  *	PCI layer indicates to libata via this hook that hot-unplug or
5967  *	module unload event has occurred.  Detach all ports.  Resource
5968  *	release is handled via devres.
5969  *
5970  *	LOCKING:
5971  *	Inherited from PCI layer (may sleep).
5972  */
ata_pci_remove_one(struct pci_dev * pdev)5973 void ata_pci_remove_one(struct pci_dev *pdev)
5974 {
5975 	struct ata_host *host = pci_get_drvdata(pdev);
5976 
5977 	ata_host_detach(host);
5978 }
5979 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
5980 
ata_pci_shutdown_one(struct pci_dev * pdev)5981 void ata_pci_shutdown_one(struct pci_dev *pdev)
5982 {
5983 	struct ata_host *host = pci_get_drvdata(pdev);
5984 	int i;
5985 
5986 	for (i = 0; i < host->n_ports; i++) {
5987 		struct ata_port *ap = host->ports[i];
5988 
5989 		ap->pflags |= ATA_PFLAG_FROZEN;
5990 
5991 		/* Disable port interrupts */
5992 		if (ap->ops->freeze)
5993 			ap->ops->freeze(ap);
5994 
5995 		/* Stop the port DMA engines */
5996 		if (ap->ops->port_stop)
5997 			ap->ops->port_stop(ap);
5998 	}
5999 }
6000 EXPORT_SYMBOL_GPL(ata_pci_shutdown_one);
6001 
6002 /* move to PCI subsystem */
pci_test_config_bits(struct pci_dev * pdev,const struct pci_bits * bits)6003 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
6004 {
6005 	unsigned long tmp = 0;
6006 
6007 	switch (bits->width) {
6008 	case 1: {
6009 		u8 tmp8 = 0;
6010 		pci_read_config_byte(pdev, bits->reg, &tmp8);
6011 		tmp = tmp8;
6012 		break;
6013 	}
6014 	case 2: {
6015 		u16 tmp16 = 0;
6016 		pci_read_config_word(pdev, bits->reg, &tmp16);
6017 		tmp = tmp16;
6018 		break;
6019 	}
6020 	case 4: {
6021 		u32 tmp32 = 0;
6022 		pci_read_config_dword(pdev, bits->reg, &tmp32);
6023 		tmp = tmp32;
6024 		break;
6025 	}
6026 
6027 	default:
6028 		return -EINVAL;
6029 	}
6030 
6031 	tmp &= bits->mask;
6032 
6033 	return (tmp == bits->val) ? 1 : 0;
6034 }
6035 EXPORT_SYMBOL_GPL(pci_test_config_bits);
6036 
6037 #ifdef CONFIG_PM
ata_pci_device_do_suspend(struct pci_dev * pdev,pm_message_t mesg)6038 void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
6039 {
6040 	pci_save_state(pdev);
6041 	pci_disable_device(pdev);
6042 
6043 	if (mesg.event & PM_EVENT_SLEEP)
6044 		pci_set_power_state(pdev, PCI_D3hot);
6045 }
6046 EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
6047 
ata_pci_device_do_resume(struct pci_dev * pdev)6048 int ata_pci_device_do_resume(struct pci_dev *pdev)
6049 {
6050 	int rc;
6051 
6052 	pci_set_power_state(pdev, PCI_D0);
6053 	pci_restore_state(pdev);
6054 
6055 	rc = pcim_enable_device(pdev);
6056 	if (rc) {
6057 		dev_err(&pdev->dev,
6058 			"failed to enable device after resume (%d)\n", rc);
6059 		return rc;
6060 	}
6061 
6062 	pci_set_master(pdev);
6063 	return 0;
6064 }
6065 EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
6066 
ata_pci_device_suspend(struct pci_dev * pdev,pm_message_t mesg)6067 int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6068 {
6069 	struct ata_host *host = pci_get_drvdata(pdev);
6070 
6071 	ata_host_suspend(host, mesg);
6072 
6073 	ata_pci_device_do_suspend(pdev, mesg);
6074 
6075 	return 0;
6076 }
6077 EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
6078 
ata_pci_device_resume(struct pci_dev * pdev)6079 int ata_pci_device_resume(struct pci_dev *pdev)
6080 {
6081 	struct ata_host *host = pci_get_drvdata(pdev);
6082 	int rc;
6083 
6084 	rc = ata_pci_device_do_resume(pdev);
6085 	if (rc == 0)
6086 		ata_host_resume(host);
6087 	return rc;
6088 }
6089 EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6090 #endif /* CONFIG_PM */
6091 #endif /* CONFIG_PCI */
6092 
6093 /**
6094  *	ata_platform_remove_one - Platform layer callback for device removal
6095  *	@pdev: Platform device that was removed
6096  *
6097  *	Platform layer indicates to libata via this hook that hot-unplug or
6098  *	module unload event has occurred.  Detach all ports.  Resource
6099  *	release is handled via devres.
6100  *
6101  *	LOCKING:
6102  *	Inherited from platform layer (may sleep).
6103  */
ata_platform_remove_one(struct platform_device * pdev)6104 int ata_platform_remove_one(struct platform_device *pdev)
6105 {
6106 	struct ata_host *host = platform_get_drvdata(pdev);
6107 
6108 	ata_host_detach(host);
6109 
6110 	return 0;
6111 }
6112 EXPORT_SYMBOL_GPL(ata_platform_remove_one);
6113 
6114 #ifdef CONFIG_ATA_FORCE
6115 
6116 #define force_cbl(name, flag)				\
6117 	{ #name,	.cbl		= (flag) }
6118 
6119 #define force_spd_limit(spd, val)			\
6120 	{ #spd,	.spd_limit		= (val) }
6121 
6122 #define force_xfer(mode, shift)				\
6123 	{ #mode,	.xfer_mask	= (1UL << (shift)) }
6124 
6125 #define force_lflag_on(name, flags)			\
6126 	{ #name,	.lflags_on	= (flags) }
6127 
6128 #define force_lflag_onoff(name, flags)			\
6129 	{ "no" #name,	.lflags_on	= (flags) },	\
6130 	{ #name,	.lflags_off	= (flags) }
6131 
6132 #define force_horkage_on(name, flag)			\
6133 	{ #name,	.horkage_on	= (flag) }
6134 
6135 #define force_horkage_onoff(name, flag)			\
6136 	{ "no" #name,	.horkage_on	= (flag) },	\
6137 	{ #name,	.horkage_off	= (flag) }
6138 
6139 static const struct ata_force_param force_tbl[] __initconst = {
6140 	force_cbl(40c,			ATA_CBL_PATA40),
6141 	force_cbl(80c,			ATA_CBL_PATA80),
6142 	force_cbl(short40c,		ATA_CBL_PATA40_SHORT),
6143 	force_cbl(unk,			ATA_CBL_PATA_UNK),
6144 	force_cbl(ign,			ATA_CBL_PATA_IGN),
6145 	force_cbl(sata,			ATA_CBL_SATA),
6146 
6147 	force_spd_limit(1.5Gbps,	1),
6148 	force_spd_limit(3.0Gbps,	2),
6149 
6150 	force_xfer(pio0,		ATA_SHIFT_PIO + 0),
6151 	force_xfer(pio1,		ATA_SHIFT_PIO + 1),
6152 	force_xfer(pio2,		ATA_SHIFT_PIO + 2),
6153 	force_xfer(pio3,		ATA_SHIFT_PIO + 3),
6154 	force_xfer(pio4,		ATA_SHIFT_PIO + 4),
6155 	force_xfer(pio5,		ATA_SHIFT_PIO + 5),
6156 	force_xfer(pio6,		ATA_SHIFT_PIO + 6),
6157 	force_xfer(mwdma0,		ATA_SHIFT_MWDMA + 0),
6158 	force_xfer(mwdma1,		ATA_SHIFT_MWDMA + 1),
6159 	force_xfer(mwdma2,		ATA_SHIFT_MWDMA + 2),
6160 	force_xfer(mwdma3,		ATA_SHIFT_MWDMA + 3),
6161 	force_xfer(mwdma4,		ATA_SHIFT_MWDMA + 4),
6162 	force_xfer(udma0,		ATA_SHIFT_UDMA + 0),
6163 	force_xfer(udma16,		ATA_SHIFT_UDMA + 0),
6164 	force_xfer(udma/16,		ATA_SHIFT_UDMA + 0),
6165 	force_xfer(udma1,		ATA_SHIFT_UDMA + 1),
6166 	force_xfer(udma25,		ATA_SHIFT_UDMA + 1),
6167 	force_xfer(udma/25,		ATA_SHIFT_UDMA + 1),
6168 	force_xfer(udma2,		ATA_SHIFT_UDMA + 2),
6169 	force_xfer(udma33,		ATA_SHIFT_UDMA + 2),
6170 	force_xfer(udma/33,		ATA_SHIFT_UDMA + 2),
6171 	force_xfer(udma3,		ATA_SHIFT_UDMA + 3),
6172 	force_xfer(udma44,		ATA_SHIFT_UDMA + 3),
6173 	force_xfer(udma/44,		ATA_SHIFT_UDMA + 3),
6174 	force_xfer(udma4,		ATA_SHIFT_UDMA + 4),
6175 	force_xfer(udma66,		ATA_SHIFT_UDMA + 4),
6176 	force_xfer(udma/66,		ATA_SHIFT_UDMA + 4),
6177 	force_xfer(udma5,		ATA_SHIFT_UDMA + 5),
6178 	force_xfer(udma100,		ATA_SHIFT_UDMA + 5),
6179 	force_xfer(udma/100,		ATA_SHIFT_UDMA + 5),
6180 	force_xfer(udma6,		ATA_SHIFT_UDMA + 6),
6181 	force_xfer(udma133,		ATA_SHIFT_UDMA + 6),
6182 	force_xfer(udma/133,		ATA_SHIFT_UDMA + 6),
6183 	force_xfer(udma7,		ATA_SHIFT_UDMA + 7),
6184 
6185 	force_lflag_on(nohrst,		ATA_LFLAG_NO_HRST),
6186 	force_lflag_on(nosrst,		ATA_LFLAG_NO_SRST),
6187 	force_lflag_on(norst,		ATA_LFLAG_NO_HRST | ATA_LFLAG_NO_SRST),
6188 	force_lflag_on(rstonce,		ATA_LFLAG_RST_ONCE),
6189 	force_lflag_onoff(dbdelay,	ATA_LFLAG_NO_DEBOUNCE_DELAY),
6190 
6191 	force_horkage_onoff(ncq,	ATA_HORKAGE_NONCQ),
6192 	force_horkage_onoff(ncqtrim,	ATA_HORKAGE_NO_NCQ_TRIM),
6193 	force_horkage_onoff(ncqati,	ATA_HORKAGE_NO_NCQ_ON_ATI),
6194 
6195 	force_horkage_onoff(trim,	ATA_HORKAGE_NOTRIM),
6196 	force_horkage_on(trim_zero,	ATA_HORKAGE_ZERO_AFTER_TRIM),
6197 	force_horkage_on(max_trim_128m, ATA_HORKAGE_MAX_TRIM_128M),
6198 
6199 	force_horkage_onoff(dma,	ATA_HORKAGE_NODMA),
6200 	force_horkage_on(atapi_dmadir,	ATA_HORKAGE_ATAPI_DMADIR),
6201 	force_horkage_on(atapi_mod16_dma, ATA_HORKAGE_ATAPI_MOD16_DMA),
6202 
6203 	force_horkage_onoff(dmalog,	ATA_HORKAGE_NO_DMA_LOG),
6204 	force_horkage_onoff(iddevlog,	ATA_HORKAGE_NO_ID_DEV_LOG),
6205 	force_horkage_onoff(logdir,	ATA_HORKAGE_NO_LOG_DIR),
6206 
6207 	force_horkage_on(max_sec_128,	ATA_HORKAGE_MAX_SEC_128),
6208 	force_horkage_on(max_sec_1024,	ATA_HORKAGE_MAX_SEC_1024),
6209 	force_horkage_on(max_sec_lba48,	ATA_HORKAGE_MAX_SEC_LBA48),
6210 
6211 	force_horkage_onoff(lpm,	ATA_HORKAGE_NOLPM),
6212 	force_horkage_onoff(setxfer,	ATA_HORKAGE_NOSETXFER),
6213 	force_horkage_on(dump_id,	ATA_HORKAGE_DUMP_ID),
6214 
6215 	force_horkage_on(disable,	ATA_HORKAGE_DISABLE),
6216 };
6217 
ata_parse_force_one(char ** cur,struct ata_force_ent * force_ent,const char ** reason)6218 static int __init ata_parse_force_one(char **cur,
6219 				      struct ata_force_ent *force_ent,
6220 				      const char **reason)
6221 {
6222 	char *start = *cur, *p = *cur;
6223 	char *id, *val, *endp;
6224 	const struct ata_force_param *match_fp = NULL;
6225 	int nr_matches = 0, i;
6226 
6227 	/* find where this param ends and update *cur */
6228 	while (*p != '\0' && *p != ',')
6229 		p++;
6230 
6231 	if (*p == '\0')
6232 		*cur = p;
6233 	else
6234 		*cur = p + 1;
6235 
6236 	*p = '\0';
6237 
6238 	/* parse */
6239 	p = strchr(start, ':');
6240 	if (!p) {
6241 		val = strstrip(start);
6242 		goto parse_val;
6243 	}
6244 	*p = '\0';
6245 
6246 	id = strstrip(start);
6247 	val = strstrip(p + 1);
6248 
6249 	/* parse id */
6250 	p = strchr(id, '.');
6251 	if (p) {
6252 		*p++ = '\0';
6253 		force_ent->device = simple_strtoul(p, &endp, 10);
6254 		if (p == endp || *endp != '\0') {
6255 			*reason = "invalid device";
6256 			return -EINVAL;
6257 		}
6258 	}
6259 
6260 	force_ent->port = simple_strtoul(id, &endp, 10);
6261 	if (id == endp || *endp != '\0') {
6262 		*reason = "invalid port/link";
6263 		return -EINVAL;
6264 	}
6265 
6266  parse_val:
6267 	/* parse val, allow shortcuts so that both 1.5 and 1.5Gbps work */
6268 	for (i = 0; i < ARRAY_SIZE(force_tbl); i++) {
6269 		const struct ata_force_param *fp = &force_tbl[i];
6270 
6271 		if (strncasecmp(val, fp->name, strlen(val)))
6272 			continue;
6273 
6274 		nr_matches++;
6275 		match_fp = fp;
6276 
6277 		if (strcasecmp(val, fp->name) == 0) {
6278 			nr_matches = 1;
6279 			break;
6280 		}
6281 	}
6282 
6283 	if (!nr_matches) {
6284 		*reason = "unknown value";
6285 		return -EINVAL;
6286 	}
6287 	if (nr_matches > 1) {
6288 		*reason = "ambiguous value";
6289 		return -EINVAL;
6290 	}
6291 
6292 	force_ent->param = *match_fp;
6293 
6294 	return 0;
6295 }
6296 
ata_parse_force_param(void)6297 static void __init ata_parse_force_param(void)
6298 {
6299 	int idx = 0, size = 1;
6300 	int last_port = -1, last_device = -1;
6301 	char *p, *cur, *next;
6302 
6303 	/* Calculate maximum number of params and allocate ata_force_tbl */
6304 	for (p = ata_force_param_buf; *p; p++)
6305 		if (*p == ',')
6306 			size++;
6307 
6308 	ata_force_tbl = kcalloc(size, sizeof(ata_force_tbl[0]), GFP_KERNEL);
6309 	if (!ata_force_tbl) {
6310 		printk(KERN_WARNING "ata: failed to extend force table, "
6311 		       "libata.force ignored\n");
6312 		return;
6313 	}
6314 
6315 	/* parse and populate the table */
6316 	for (cur = ata_force_param_buf; *cur != '\0'; cur = next) {
6317 		const char *reason = "";
6318 		struct ata_force_ent te = { .port = -1, .device = -1 };
6319 
6320 		next = cur;
6321 		if (ata_parse_force_one(&next, &te, &reason)) {
6322 			printk(KERN_WARNING "ata: failed to parse force "
6323 			       "parameter \"%s\" (%s)\n",
6324 			       cur, reason);
6325 			continue;
6326 		}
6327 
6328 		if (te.port == -1) {
6329 			te.port = last_port;
6330 			te.device = last_device;
6331 		}
6332 
6333 		ata_force_tbl[idx++] = te;
6334 
6335 		last_port = te.port;
6336 		last_device = te.device;
6337 	}
6338 
6339 	ata_force_tbl_size = idx;
6340 }
6341 
ata_free_force_param(void)6342 static void ata_free_force_param(void)
6343 {
6344 	kfree(ata_force_tbl);
6345 }
6346 #else
ata_parse_force_param(void)6347 static inline void ata_parse_force_param(void) { }
ata_free_force_param(void)6348 static inline void ata_free_force_param(void) { }
6349 #endif
6350 
ata_init(void)6351 static int __init ata_init(void)
6352 {
6353 	int rc;
6354 
6355 	ata_parse_force_param();
6356 
6357 	rc = ata_sff_init();
6358 	if (rc) {
6359 		ata_free_force_param();
6360 		return rc;
6361 	}
6362 
6363 	libata_transport_init();
6364 	ata_scsi_transport_template = ata_attach_transport();
6365 	if (!ata_scsi_transport_template) {
6366 		ata_sff_exit();
6367 		rc = -ENOMEM;
6368 		goto err_out;
6369 	}
6370 
6371 	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
6372 	return 0;
6373 
6374 err_out:
6375 	return rc;
6376 }
6377 
ata_exit(void)6378 static void __exit ata_exit(void)
6379 {
6380 	ata_release_transport(ata_scsi_transport_template);
6381 	libata_transport_exit();
6382 	ata_sff_exit();
6383 	ata_free_force_param();
6384 }
6385 
6386 subsys_initcall(ata_init);
6387 module_exit(ata_exit);
6388 
6389 static DEFINE_RATELIMIT_STATE(ratelimit, HZ / 5, 1);
6390 
ata_ratelimit(void)6391 int ata_ratelimit(void)
6392 {
6393 	return __ratelimit(&ratelimit);
6394 }
6395 EXPORT_SYMBOL_GPL(ata_ratelimit);
6396 
6397 /**
6398  *	ata_msleep - ATA EH owner aware msleep
6399  *	@ap: ATA port to attribute the sleep to
6400  *	@msecs: duration to sleep in milliseconds
6401  *
6402  *	Sleeps @msecs.  If the current task is owner of @ap's EH, the
6403  *	ownership is released before going to sleep and reacquired
6404  *	after the sleep is complete.  IOW, other ports sharing the
6405  *	@ap->host will be allowed to own the EH while this task is
6406  *	sleeping.
6407  *
6408  *	LOCKING:
6409  *	Might sleep.
6410  */
ata_msleep(struct ata_port * ap,unsigned int msecs)6411 void ata_msleep(struct ata_port *ap, unsigned int msecs)
6412 {
6413 	bool owns_eh = ap && ap->host->eh_owner == current;
6414 
6415 	if (owns_eh)
6416 		ata_eh_release(ap);
6417 
6418 	if (msecs < 20) {
6419 		unsigned long usecs = msecs * USEC_PER_MSEC;
6420 		usleep_range(usecs, usecs + 50);
6421 	} else {
6422 		msleep(msecs);
6423 	}
6424 
6425 	if (owns_eh)
6426 		ata_eh_acquire(ap);
6427 }
6428 EXPORT_SYMBOL_GPL(ata_msleep);
6429 
6430 /**
6431  *	ata_wait_register - wait until register value changes
6432  *	@ap: ATA port to wait register for, can be NULL
6433  *	@reg: IO-mapped register
6434  *	@mask: Mask to apply to read register value
6435  *	@val: Wait condition
6436  *	@interval: polling interval in milliseconds
6437  *	@timeout: timeout in milliseconds
6438  *
6439  *	Waiting for some bits of register to change is a common
6440  *	operation for ATA controllers.  This function reads 32bit LE
6441  *	IO-mapped register @reg and tests for the following condition.
6442  *
6443  *	(*@reg & mask) != val
6444  *
6445  *	If the condition is met, it returns; otherwise, the process is
6446  *	repeated after @interval_msec until timeout.
6447  *
6448  *	LOCKING:
6449  *	Kernel thread context (may sleep)
6450  *
6451  *	RETURNS:
6452  *	The final register value.
6453  */
ata_wait_register(struct ata_port * ap,void __iomem * reg,u32 mask,u32 val,unsigned long interval,unsigned long timeout)6454 u32 ata_wait_register(struct ata_port *ap, void __iomem *reg, u32 mask, u32 val,
6455 		      unsigned long interval, unsigned long timeout)
6456 {
6457 	unsigned long deadline;
6458 	u32 tmp;
6459 
6460 	tmp = ioread32(reg);
6461 
6462 	/* Calculate timeout _after_ the first read to make sure
6463 	 * preceding writes reach the controller before starting to
6464 	 * eat away the timeout.
6465 	 */
6466 	deadline = ata_deadline(jiffies, timeout);
6467 
6468 	while ((tmp & mask) == val && time_before(jiffies, deadline)) {
6469 		ata_msleep(ap, interval);
6470 		tmp = ioread32(reg);
6471 	}
6472 
6473 	return tmp;
6474 }
6475 EXPORT_SYMBOL_GPL(ata_wait_register);
6476 
6477 /*
6478  * Dummy port_ops
6479  */
ata_dummy_qc_issue(struct ata_queued_cmd * qc)6480 static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
6481 {
6482 	return AC_ERR_SYSTEM;
6483 }
6484 
ata_dummy_error_handler(struct ata_port * ap)6485 static void ata_dummy_error_handler(struct ata_port *ap)
6486 {
6487 	/* truly dummy */
6488 }
6489 
6490 struct ata_port_operations ata_dummy_port_ops = {
6491 	.qc_prep		= ata_noop_qc_prep,
6492 	.qc_issue		= ata_dummy_qc_issue,
6493 	.error_handler		= ata_dummy_error_handler,
6494 	.sched_eh		= ata_std_sched_eh,
6495 	.end_eh			= ata_std_end_eh,
6496 };
6497 EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
6498 
6499 const struct ata_port_info ata_dummy_port_info = {
6500 	.port_ops		= &ata_dummy_port_ops,
6501 };
6502 EXPORT_SYMBOL_GPL(ata_dummy_port_info);
6503 
ata_print_version(const struct device * dev,const char * version)6504 void ata_print_version(const struct device *dev, const char *version)
6505 {
6506 	dev_printk(KERN_DEBUG, dev, "version %s\n", version);
6507 }
6508 EXPORT_SYMBOL(ata_print_version);
6509 
6510 EXPORT_TRACEPOINT_SYMBOL_GPL(ata_tf_load);
6511 EXPORT_TRACEPOINT_SYMBOL_GPL(ata_exec_command);
6512 EXPORT_TRACEPOINT_SYMBOL_GPL(ata_bmdma_setup);
6513 EXPORT_TRACEPOINT_SYMBOL_GPL(ata_bmdma_start);
6514 EXPORT_TRACEPOINT_SYMBOL_GPL(ata_bmdma_status);
6515