aboutsummaryrefslogtreecommitdiff
path: root/drivers/ata/libata-transport.c
blob: 08e67285645bbd1cfabf68ed36c84c0ea3550892 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
/*
 *  Copyright 2008 ioogle, Inc.  All rights reserved.
 *	Released under GPL v2.
 *
 * Libata transport class.
 *
 * The ATA transport class contains common code to deal with ATA HBAs,
 * an approximated representation of ATA topologies in the driver model,
 * and various sysfs attributes to expose these topologies and management
 * interfaces to user-space.
 *
 * There are 3 objects defined in in this class:
 * - ata_port
 * - ata_link
 * - ata_device
 * Each port has a link object. Each link can have up to two devices for PATA
 * and generally one for SATA.
 * If there is SATA port multiplier [PMP], 15 additional ata_link object are
 * created.
 *
 * These objects are created when the ata host is initialized and when a PMP is
 * found. They are removed only when the HBA is removed, cleaned before the
 * error handler runs.
 */


#include <linux/kernel.h>
#include <linux/blkdev.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <scsi/scsi_transport.h>
#include <linux/libata.h>
#include <linux/hdreg.h>
#include <linux/uaccess.h>
#include <linux/pm_runtime.h>

#include "libata.h"
#include "libata-transport.h"

#define ATA_PORT_ATTRS		2
#define ATA_LINK_ATTRS		3
#define ATA_DEV_ATTRS		9

struct scsi_transport_template;
struct scsi_transport_template *ata_scsi_transport_template;

struct ata_internal {
	struct scsi_transport_template t;

	struct device_attribute private_port_attrs[ATA_PORT_ATTRS];
	struct device_attribute private_link_attrs[ATA_LINK_ATTRS];
	struct device_attribute private_dev_attrs[ATA_DEV_ATTRS];

	struct transport_container link_attr_cont;
	struct transport_container dev_attr_cont;

	/*
	 * The array of null terminated pointers to attributes
	 * needed by scsi_sysfs.c
	 */
	struct device_attribute *link_attrs[ATA_LINK_ATTRS + 1];
	struct device_attribute *port_attrs[ATA_PORT_ATTRS + 1];
	struct device_attribute *dev_attrs[ATA_DEV_ATTRS + 1];
};
#define to_ata_internal(tmpl)	container_of(tmpl, struct ata_internal, t)


#define tdev_to_device(d)					\
	container_of((d), struct ata_device, tdev)
#define transport_class_to_dev(dev)				\
	tdev_to_device((dev)->parent)

#define tdev_to_link(d)						\
	container_of((d), struct ata_link, tdev)
#define transport_class_to_link(dev)				\
	tdev_to_link((dev)->parent)

#define tdev_to_port(d)						\
	container_of((d), struct ata_port, tdev)
#define transport_class_to_port(dev)				\
	tdev_to_port((dev)->parent)


/* Device objects are always created whit link objects */
static int ata_tdev_add(struct ata_device *dev);
static void ata_tdev_delete(struct ata_device *dev);


/*
 * Hack to allow attributes of the same name in different objects.
 */
#define ATA_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
	struct device_attribute device_attr_##_prefix##_##_name = \
	__ATTR(_name,_mode,_show,_store)

#define ata_bitfield_name_match(title, table)			\
static ssize_t							\
get_ata_##title##_names(u32 table_key, char *buf)		\
{								\
	char *prefix = "";					\
	ssize_t len = 0;					\
	int i;							\
								\
	for (i = 0; i < ARRAY_SIZE(table); i++) {		\
		if (table[i].value & table_key) {		\
			len += sprintf(buf + len, "%s%s",	\
				prefix, table[i].name);		\
			prefix = ", ";				\
		}						\
	}							\
	len += sprintf(buf + len, "\n");			\
	return len;						\
}

#define ata_bitfield_name_search(title, table)			\
static ssize_t							\
get_ata_##title##_names(u32 table_key, char *buf)		\
{								\
	ssize_t len = 0;					\
	int i;							\
								\
	for (i = 0; i < ARRAY_SIZE(table); i++) {		\
		if (table[i].value == table_key) {		\
			len += sprintf(buf + len, "%s",		\
				table[i].name);			\
			break;					\
		}						\
	}							\
	len += sprintf(buf + len, "\n");			\
	return len;						\
}

static struct {
	u32		value;
	char		*name;
} ata_class_names[] = {
	{ ATA_DEV_UNKNOWN,		"unknown" },
	{ ATA_DEV_ATA,			"ata" },
	{ ATA_DEV_ATA_UNSUP,		"ata" },
	{ ATA_DEV_ATAPI,		"atapi" },
	{ ATA_DEV_ATAPI_UNSUP,		"atapi" },
	{ ATA_DEV_PMP,			"pmp" },
	{ ATA_DEV_PMP_UNSUP,		"pmp" },
	{ ATA_DEV_SEMB,			"semb" },
	{ ATA_DEV_SEMB_UNSUP,		"semb" },
	{ ATA_DEV_NONE,			"none" }
};
ata_bitfield_name_search(class, ata_class_names)


static struct {
	u32		value;
	char		*name;
} ata_err_names[] = {
	{ AC_ERR_DEV,			"DeviceError" },
	{ AC_ERR_HSM,			"HostStateMachineError" },
	{ AC_ERR_TIMEOUT,		"Timeout" },
	{ AC_ERR_MEDIA,			"MediaError" },
	{ AC_ERR_ATA_BUS,		"BusError" },
	{ AC_ERR_HOST_BUS,		"HostBusError" },
	{ AC_ERR_SYSTEM,		"SystemError" },
	{ AC_ERR_INVALID,		"InvalidArg" },
	{ AC_ERR_OTHER,			"Unknown" },
	{ AC_ERR_NODEV_HINT,		"NoDeviceHint" },
	{ AC_ERR_NCQ,		 	"NCQError" }
};
ata_bitfield_name_match(err, ata_err_names)

static struct {
	u32		value;
	char		*name;
} ata_xfer_names[] = {
	{ XFER_UDMA_7,			"XFER_UDMA_7" },
	{ XFER_UDMA_6,			"XFER_UDMA_6" },
	{ XFER_UDMA_5,			"XFER_UDMA_5" },
	{ XFER_UDMA_4,			"XFER_UDMA_4" },
	{ XFER_UDMA_3,			"XFER_UDMA_3" },
	{ XFER_UDMA_2,			"XFER_UDMA_2" },
	{ XFER_UDMA_1,			"XFER_UDMA_1" },
	{ XFER_UDMA_0,			"XFER_UDMA_0" },
	{ XFER_MW_DMA_4,		"XFER_MW_DMA_4" },
	{ XFER_MW_DMA_3,		"XFER_MW_DMA_3" },
	{ XFER_MW_DMA_2,		"XFER_MW_DMA_2" },
	{ XFER_MW_DMA_1,		"XFER_MW_DMA_1" },
	{ XFER_MW_DMA_0,		"XFER_MW_DMA_0" },
	{ XFER_SW_DMA_2,		"XFER_SW_DMA_2" },
	{ XFER_SW_DMA_1,		"XFER_SW_DMA_1" },
	{ XFER_SW_DMA_0,		"XFER_SW_DMA_0" },
	{ XFER_PIO_6,			"XFER_PIO_6" },
	{ XFER_PIO_5,			"XFER_PIO_5" },
	{ XFER_PIO_4,			"XFER_PIO_4" },
	{ XFER_PIO_3,			"XFER_PIO_3" },
	{ XFER_PIO_2,			"XFER_PIO_2" },
	{ XFER_PIO_1,			"XFER_PIO_1" },
	{ XFER_PIO_0,			"XFER_PIO_0" },
	{ XFER_PIO_SLOW,		"XFER_PIO_SLOW" }
};
ata_bitfield_name_match(xfer,ata_xfer_names)

/*
 * ATA Port attributes
 */
#define ata_port_show_simple(field, name, format_string, cast)		\
static ssize_t								\
show_ata_port_##name(struct device *dev,				\
		     struct device_attribute *attr, char *buf)		\
{									\
	struct ata_port *ap = transport_class_to_port(dev);		\
									\
	return snprintf(buf, 20, format_string, cast ap->field);	\
}

#define ata_port_simple_attr(field, name, format_string, type)		\
	ata_port_show_simple(field, name, format_string, (type))	\
static DEVICE_ATTR(name, S_IRUGO, show_ata_port_##name, NULL)

ata_port_simple_attr(nr_pmp_links, nr_pmp_links, "%d\n", int);
ata_port_simple_attr(stats.idle_irq, idle_irq, "%ld\n", unsigned long);

static DECLARE_TRANSPORT_CLASS(ata_port_class,
			       "ata_port", NULL, NULL, NULL);

static void ata_tport_release(struct device *dev)
{
	put_device(dev->parent);
}

/**
 * ata_is_port --  check if a struct device represents a ATA port
 * @dev:	device to check
 *
 * Returns:
 *	%1 if the device represents a ATA Port, %0 else
 */
static int ata_is_port(const struct device *dev)
{
	return dev->release == ata_tport_release;
}

static int ata_tport_match(struct attribute_container *cont,
			   struct device *dev)
{
	if (!ata_is_port(dev))
		return 0;
	return &ata_scsi_transport_template->host_attrs.ac == cont;
}

/**
 * ata_tport_delete  --  remove ATA PORT
 * @port:	ATA PORT to remove
 *
 * Removes the specified ATA PORT.  Remove the associated link as well.
 */
void ata_tport_delete(struct ata_port *ap)
{
	struct device *dev = &ap->tdev;

	ata_tlink_delete(&ap->link);

	transport_remove_device(dev);
	device_del(dev);
	transport_destroy_device(dev);
	put_device(dev);
}

/** ata_tport_add - initialize a transport ATA port structure
 *
 * @parent:	parent device
 * @ap:		existing ata_port structure
 *
 * Initialize a ATA port structure for sysfs.  It will be added to the device
 * tree below the device specified by @parent which could be a PCI device.
 *
 * Returns %0 on success
 */
int ata_tport_add(struct device *parent,
		  struct ata_port *ap)
{
	int error;
	struct device *dev = &ap->tdev;

	device_initialize(dev);
	dev->type = &ata_port_type;

	dev->parent = get_device(parent);
	dev->release = ata_tport_release;
	dev_set_name(dev, "ata%d", ap->print_id);
	transport_setup_device(dev);
	error = device_add(dev);
	if (error) {
		goto tport_err;
	}

	device_enable_async_suspend(dev);
	pm_runtime_set_active(dev);
	pm_runtime_enable(dev);
	pm_runtime_forbid(dev);

	transport_add_device(dev);
	transport_configure_device(dev);

	error = ata_tlink_add(&ap->link);
	if (error) {
		goto tport_link_err;
	}
	return 0;

 tport_link_err:
	transport_remove_device(dev);
	device_del(dev);

 tport_err:
	transport_destroy_device(dev);
	put_device(dev);
	return error;
}


/*
 * ATA link attributes
 */
static int noop(int x) { return x; }

#define ata_link_show_linkspeed(field, format)			        \
static ssize_t								\
show_ata_link_##field(struct device *dev,				\
		      struct device_attribute *attr, char *buf)		\
{									\
	struct ata_link *link = transport_class_to_link(dev);		\
									\
	return sprintf(buf, "%s\n", sata_spd_string(format(link->field))); \
}

#define ata_link_linkspeed_attr(field, format)				\
	ata_link_show_linkspeed(field, format)				\
static DEVICE_ATTR(field, S_IRUGO, show_ata_link_##field, NULL)

ata_link_linkspeed_attr(hw_sata_spd_limit, fls);
ata_link_linkspeed_attr(sata_spd_limit, fls);
ata_link_linkspeed_attr(sata_spd, noop);


static DECLARE_TRANSPORT_CLASS(ata_link_class,
		"ata_link", NULL, NULL, NULL);

static void ata_tlink_release(struct device *dev)
{
	put_device(dev->parent);
}

/**
 * ata_is_link --  check if a struct device represents a ATA link
 * @dev:	device to check
 *
 * Returns:
 *	%1 if the device represents a ATA link, %0 else
 */
static int ata_is_link(const struct device *dev)
{
	return dev->release == ata_tlink_release;
}

static int ata_tlink_match(struct attribute_container *cont,
			   struct device *dev)
{
	struct ata_internal* i = to_ata_internal(ata_scsi_transport_template);
	if (!ata_is_link(dev))
		return 0;
	return &i->link_attr_cont.ac == cont;
}

/**
 * ata_tlink_delete  --  remove ATA LINK
 * @port:	ATA LINK to remove
 *
 * Removes the specified ATA LINK.  remove associated ATA device(s) as well.
 */
void ata_tlink_delete(struct ata_link *link)
{
	struct device *dev = &link->tdev;
	struct ata_device *ata_dev;

	ata_for_each_dev(ata_dev, link, ALL) {
		ata_tdev_delete(ata_dev);
	}

	transport_remove_device(dev);
	device_del(dev);
	transport_destroy_device(dev);
	put_device(dev);
}

/**
 * ata_tlink_add  --  initialize a transport ATA link structure
 * @link:	allocated ata_link structure.
 *
 * Initialize an ATA LINK structure for sysfs.  It will be added in the
 * device tree below the ATA PORT it belongs to.
 *
 * Returns %0 on success
 */
int ata_tlink_add(struct ata_link *link)
{
	struct device *dev = &link->tdev;
	struct ata_port *ap = link->ap;
	struct ata_device *ata_dev;
	int error;

	device_initialize(dev);
	dev->parent = get_device(&ap->tdev);
	dev->release = ata_tlink_release;
	if (ata_is_host_link(link))
		dev_set_name(dev, "link%d", ap->print_id);
        else
		dev_set_name(dev, "link%d.%d", ap->print_id, link->pmp);

	transport_setup_device(dev);

	error = device_add(dev);
	if (error) {
		goto tlink_err;
	}

	transport_add_device(dev);
	transport_configure_device(dev);

	ata_for_each_dev(ata_dev, link, ALL) {
		error = ata_tdev_add(ata_dev);
		if (error) {
			goto tlink_dev_err;
		}
	}
	return 0;
  tlink_dev_err:
	while (--ata_dev >= link->device) {
		ata_tdev_delete(ata_dev);
	}
	transport_remove_device(dev);
	device_del(dev);
  tlink_err:
	transport_destroy_device(dev);
	put_device(dev);
	return error;
}

/*
 * ATA device attributes
 */

#define ata_dev_show_class(title, field)				\
static ssize_t								\
show_ata_dev_##field(struct device *dev,				\
		     struct device_attribute *attr, char *buf)		\
{									\
	struct ata_device *ata_dev = transport_class_to_dev(dev);	\
									\
	return get_ata_##title##_names(ata_dev->field, buf);		\
}

#define ata_dev_attr(title, field)					\
	ata_dev_show_class(title, field)				\
static DEVICE_ATTR(field, S_IRUGO, show_ata_dev_##field, NULL)

ata_dev_attr(class, class);
ata_dev_attr(xfer, pio_mode);
ata_dev_attr(xfer, dma_mode);
ata_dev_attr(xfer, xfer_mode);


#define ata_dev_show_simple(field, format_string, cast)		\
static ssize_t								\
show_ata_dev_##field(struct device *dev,				\
		     struct device_attribute *attr, char *buf)		\
{									\
	struct ata_device *ata_dev = transport_class_to_dev(dev);	\
									\
	return snprintf(buf, 20, format_string, cast ata_dev->field);	\
}

#define ata_dev_simple_attr(field, format_string, type)	\
	ata_dev_show_simple(field, format_string, (type))	\
static DEVICE_ATTR(field, S_IRUGO, 			\
		   show_ata_dev_##field, NULL)

ata_dev_simple_attr(spdn_cnt, "%d\n", int);

struct ata_show_ering_arg {
	char* buf;
	int written;
};

static int ata_show_ering(struct ata_ering_entry *ent, void *void_arg)
{
	struct ata_show_ering_arg* arg = void_arg;
	struct timespec time;

	jiffies_to_timespec(ent->timestamp,&time);
	arg->written += sprintf(arg->buf + arg->written,
			       "[%5lu.%06lu]",
			       time.tv_sec, time.tv_nsec);
	arg->written += get_ata_err_names(ent->err_mask,
					  arg->buf + arg->written);
	return 0;
}

static ssize_t
show_ata_dev_ering(struct device *dev,
		   struct device_attribute *attr, char *buf)
{
	struct ata_device *ata_dev = transport_class_to_dev(dev);
	struct ata_show_ering_arg arg = { buf, 0 };

	ata_ering_map(&ata_dev->ering, ata_show_ering, &arg);
	return arg.written;
}


static DEVICE_ATTR(ering, S_IRUGO, show_ata_dev_ering, NULL);

static ssize_t
show_ata_dev_id(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct ata_device *ata_dev = transport_class_to_dev(dev);
	int written = 0, i = 0;

	if (ata_dev->class == ATA_DEV_PMP)
		return 0;
	for(i=0;i<ATA_ID_WORDS;i++)  {
		written += snprintf(buf+written, 20, "%04x%c",
				    ata_dev->id[i],
				    ((i+1) & 7) ? ' ' : '\n');
	}
	return written;
}

static DEVICE_ATTR(id, S_IRUGO, show_ata_dev_id, NULL);

static ssize_t
show_ata_dev_gscr(struct device *dev,
		  struct device_attribute *attr, char *buf)
{
	struct ata_device *ata_dev = transport_class_to_dev(dev);
	int written = 0, i = 0;

	if (ata_dev->class != ATA_DEV_PMP)
		return 0;
	for(i=0;i<SATA_PMP_GSCR_DWORDS;i++)  {
		written += snprintf(buf+written, 20, "%08x%c",
				    ata_dev->gscr[i],
				    ((i+1) & 3) ? ' ' : '\n');
	}
	if (SATA_PMP_GSCR_DWORDS & 3)
		buf[written-1] = '\n';
	return written;
}

static DEVICE_ATTR(gscr, S_IRUGO, show_ata_dev_gscr, NULL);

static DECLARE_TRANSPORT_CLASS(ata_dev_class,
			       "ata_device", NULL, NULL, NULL);

static void ata_tdev_release(struct device *dev)
{
	put_device(dev->parent);
}

/**
 * ata_is_ata_dev  --  check if a struct device represents a ATA device
 * @dev:	device to check
 *
 * Returns:
 *	%1 if the device represents a ATA device, %0 else
 */
static int ata_is_ata_dev(const struct device *dev)
{
	return dev->release == ata_tdev_release;
}

static int ata_tdev_match(struct attribute_container *cont,
			  struct device *dev)
{
	struct ata_internal* i = to_ata_internal(ata_scsi_transport_template);
	if (!ata_is_ata_dev(dev))
		return 0;
	return &i->dev_attr_cont.ac == cont;
}

/**
 * ata_tdev_free  --  free a ATA LINK
 * @dev:	ATA PHY to free
 *
 * Frees the specified ATA PHY.
 *
 * Note:
 *   This function must only be called on a PHY that has not
 *   successfully been added using ata_tdev_add().
 */
static void ata_tdev_free(struct ata_device *dev)
{
	transport_destroy_device(&dev->tdev);
	put_device(&dev->tdev);
}

/**
 * ata_tdev_delete  --  remove ATA device
 * @port:	ATA PORT to remove
 *
 * Removes the specified ATA device.
 */
static void ata_tdev_delete(struct ata_device *ata_dev)
{
	struct device *dev = &ata_dev->tdev;

	transport_remove_device(dev);
	device_del(dev);
	ata_tdev_free(ata_dev);
}


/**
 * ata_tdev_add  --  initialize a transport ATA device structure.
 * @ata_dev:	ata_dev structure.
 *
 * Initialize an ATA device structure for sysfs.  It will be added in the
 * device tree below the ATA LINK device it belongs to.
 *
 * Returns %0 on success
 */
static int ata_tdev_add(struct ata_device *ata_dev)
{
	struct device *dev = &ata_dev->tdev;
	struct ata_link *link = ata_dev->link;
	struct ata_port *ap = link->ap;
	int error;

	device_initialize(dev);
	dev->parent = get_device(&link->tdev);
	dev->release = ata_tdev_release;
	if (ata_is_host_link(link))
		dev_set_name(dev, "dev%d.%d", ap->print_id,ata_dev->devno);
        else
		dev_set_name(dev, "dev%d.%d.0", ap->print_id, link->pmp);

	transport_setup_device(dev);
	error = device_add(dev);
	if (error) {
		ata_tdev_free(ata_dev);
		return error;
	}

	transport_add_device(dev);
	transport_configure_device(dev);
	return 0;
}


/*
 * Setup / Teardown code
 */

#define SETUP_TEMPLATE(attrb, field, perm, test)			\
	i->private_##attrb[count] = dev_attr_##field;		       	\
	i->private_##attrb[count].attr.mode = perm;			\
	i->attrb[count] = &i->private_##attrb[count];			\
	if (test)							\
		count++

#define SETUP_LINK_ATTRIBUTE(field)					\
	SETUP_TEMPLATE(link_attrs, field, S_IRUGO, 1)

#define SETUP_PORT_ATTRIBUTE(field)					\
	SETUP_TEMPLATE(port_attrs, field, S_IRUGO, 1)

#define SETUP_DEV_ATTRIBUTE(field)					\
	SETUP_TEMPLATE(dev_attrs, field, S_IRUGO, 1)

/**
 * ata_attach_transport  --  instantiate ATA transport template
 */
struct scsi_transport_template *ata_attach_transport(void)
{
	struct ata_internal *i;
	int count;

	i = kzalloc(sizeof(struct ata_internal), GFP_KERNEL);
	if (!i)
		return NULL;

	i->t.eh_strategy_handler	= ata_scsi_error;
	i->t.eh_timed_out		= ata_scsi_timed_out;
	i->t.user_scan			= ata_scsi_user_scan;

	i->t.host_attrs.ac.attrs = &i->port_attrs[0];
	i->t.host_attrs.ac.class = &ata_port_class.class;
	i->t.host_attrs.ac.match = ata_tport_match;
	transport_container_register(&i->t.host_attrs);

	i->link_attr_cont.ac.class = &ata_link_class.class;
	i->link_attr_cont.ac.attrs = &i->link_attrs[0];
	i->link_attr_cont.ac.match = ata_tlink_match;
	transport_container_register(&i->link_attr_cont);

	i->dev_attr_cont.ac.class = &ata_dev_class.class;
	i->dev_attr_cont.ac.attrs = &i->dev_attrs[0];
	i->dev_attr_cont.ac.match = ata_tdev_match;
	transport_container_register(&i->dev_attr_cont);

	count = 0;
	SETUP_PORT_ATTRIBUTE(nr_pmp_links);
	SETUP_PORT_ATTRIBUTE(idle_irq);
	BUG_ON(count > ATA_PORT_ATTRS);
	i->port_attrs[count] = NULL;

	count = 0;
	SETUP_LINK_ATTRIBUTE(hw_sata_spd_limit);
	SETUP_LINK_ATTRIBUTE(sata_spd_limit);
	SETUP_LINK_ATTRIBUTE(sata_spd);
	BUG_ON(count > ATA_LINK_ATTRS);
	i->link_attrs[count] = NULL;

	count = 0;
	SETUP_DEV_ATTRIBUTE(class);
	SETUP_DEV_ATTRIBUTE(pio_mode);
	SETUP_DEV_ATTRIBUTE(dma_mode);
	SETUP_DEV_ATTRIBUTE(xfer_mode);
	SETUP_DEV_ATTRIBUTE(spdn_cnt);
	SETUP_DEV_ATTRIBUTE(ering);
	SETUP_DEV_ATTRIBUTE(id);
	SETUP_DEV_ATTRIBUTE(gscr);
	BUG_ON(count > ATA_DEV_ATTRS);
	i->dev_attrs[count] = NULL;

	return &i->t;
}

/**
 * ata_release_transport  --  release ATA transport template instance
 * @t:		transport template instance
 */
void ata_release_transport(struct scsi_transport_template *t)
{
	struct ata_internal *i = to_ata_internal(t);

	transport_container_unregister(&i->t.host_attrs);
	transport_container_unregister(&i->link_attr_cont);
	transport_container_unregister(&i->dev_attr_cont);

	kfree(i);
}

__init int libata_transport_init(void)
{
	int error;

	error = transport_class_register(&ata_link_class);
	if (error)
		goto out_unregister_transport;
	error = transport_class_register(&ata_port_class);
	if (error)
		goto out_unregister_link;
	error = transport_class_register(&ata_dev_class);
	if (error)
		goto out_unregister_port;
	return 0;

 out_unregister_port:
	transport_class_unregister(&ata_port_class);
 out_unregister_link:
	transport_class_unregister(&ata_link_class);
 out_unregister_transport:
	return error;

}

void __exit libata_transport_exit(void)
{
	transport_class_unregister(&ata_link_class);
	transport_class_unregister(&ata_port_class);
	transport_class_unregister(&ata_dev_class);
}