aboutsummaryrefslogblamecommitdiffstats
path: root/drivers/scsi/scsi_transport_sas.c
blob: 1d145d2f9a38b37ed6a3b0b281f60e78aa1ee7c5 (plain) (tree)
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





























































































































































                                                                               

                                                                             





















































































































































































































































































































































































































































































                                                                               
                                
 


                                      




                                     


















































































































































































                                                                             
/*
 * Copyright (C) 2005 Dell Inc.
 *	Released under GPL v2.
 *
 * Serial Attached SCSI (SAS) transport class.
 *
 * The SAS transport class contains common code to deal with SAS HBAs,
 * an aproximated representation of SAS topologies in the driver model,
 * and various sysfs attributes to expose these topologies and managment
 * interfaces to userspace.
 *
 * In addition to the basic SCSI core objects this transport class
 * introduces two additional intermediate objects:  The SAS PHY
 * as represented by struct sas_phy defines an "outgoing" PHY on
 * a SAS HBA or Expander, and the SAS remote PHY represented by
 * struct sas_rphy defines an "incoming" PHY on a SAS Expander or
 * end device.  Note that this is purely a software concept, the
 * underlying hardware for a PHY and a remote PHY is the exactly
 * the same.
 *
 * There is no concept of a SAS port in this code, users can see
 * what PHYs form a wide port based on the port_identifier attribute,
 * which is the same for all PHYs in a port.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/err.h>

#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_sas.h>


#define SAS_HOST_ATTRS		0
#define SAS_PORT_ATTRS		11
#define SAS_RPORT_ATTRS		5

struct sas_internal {
	struct scsi_transport_template t;
	struct sas_function_template *f;

	struct class_device_attribute private_host_attrs[SAS_HOST_ATTRS];
	struct class_device_attribute private_phy_attrs[SAS_PORT_ATTRS];
	struct class_device_attribute private_rphy_attrs[SAS_RPORT_ATTRS];

	struct transport_container phy_attr_cont;
	struct transport_container rphy_attr_cont;

	/*
	 * The array of null terminated pointers to attributes
	 * needed by scsi_sysfs.c
	 */
	struct class_device_attribute *host_attrs[SAS_HOST_ATTRS + 1];
	struct class_device_attribute *phy_attrs[SAS_PORT_ATTRS + 1];
	struct class_device_attribute *rphy_attrs[SAS_RPORT_ATTRS + 1];
};
#define to_sas_internal(tmpl)	container_of(tmpl, struct sas_internal, t)

struct sas_host_attrs {
	struct list_head rphy_list;
	spinlock_t lock;
	u32 next_target_id;
};
#define to_sas_host_attrs(host)	((struct sas_host_attrs *)(host)->shost_data)


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


/*
 * Pretty printing helpers
 */

#define sas_bitfield_name_match(title, table)			\
static ssize_t							\
get_sas_##title##_names(u32 table_key, char *buf)		\
{								\
	char *prefix = "";					\
	ssize_t len = 0;					\
	int i;							\
								\
	for (i = 0; i < sizeof(table)/sizeof(table[0]); 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 sas_bitfield_name_search(title, table)			\
static ssize_t							\
get_sas_##title##_names(u32 table_key, char *buf)		\
{								\
	ssize_t len = 0;					\
	int i;							\
								\
	for (i = 0; i < sizeof(table)/sizeof(table[0]); 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;
} sas_device_type_names[] = {
	{ SAS_PHY_UNUSED,		"unused" },
	{ SAS_END_DEVICE,		"end device" },
	{ SAS_EDGE_EXPANDER_DEVICE,	"edge expander" },
	{ SAS_FANOUT_EXPANDER_DEVICE,	"fanout expander" },
};
sas_bitfield_name_search(device_type, sas_device_type_names)


static struct {
	u32		value;
	char		*name;
} sas_protocol_names[] = {
	{ SAS_PROTOCOL_SATA,		"sata" },
	{ SAS_PROTOCOL_SMP,		"smp" },
	{ SAS_PROTOCOL_STP,		"stp" },
	{ SAS_PROTOCOL_SSP,		"ssp" },
};
sas_bitfield_name_match(protocol, sas_protocol_names)

static struct {
	u32		value;
	char		*name;
} sas_linkspeed_names[] = {
	{ SAS_LINK_RATE_UNKNOWN,	"Unknown" },
	{ SAS_PHY_DISABLED,		"Phy disabled" },
	{ SAS_LINK_RATE_FAILED,		"Link Rate failed" },
	{ SAS_SATA_SPINUP_HOLD,		"Spin-up hold" },
	{ SAS_LINK_RATE_1_5_GBPS,	"1.5 Gbit" },
	{ SAS_LINK_RATE_3_0_GBPS,	"3.0 Gbit" },
};
sas_bitfield_name_search(linkspeed, sas_linkspeed_names)


/*
 * SAS host attributes
 */

static int sas_host_setup(struct transport_container *tc, struct device *dev,
			  struct class_device *cdev)
{
	struct Scsi_Host *shost = dev_to_shost(dev);
	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);

	INIT_LIST_HEAD(&sas_host->rphy_list);
	spin_lock_init(&sas_host->lock);
	sas_host->next_target_id = 0;
	return 0;
}

static DECLARE_TRANSPORT_CLASS(sas_host_class,
		"sas_host", sas_host_setup, NULL, NULL);

static int sas_host_match(struct attribute_container *cont,
			    struct device *dev)
{
	struct Scsi_Host *shost;
	struct sas_internal *i;

	if (!scsi_is_host_device(dev))
		return 0;
	shost = dev_to_shost(dev);

	if (!shost->transportt)
		return 0;
	if (shost->transportt->host_attrs.ac.class !=
			&sas_host_class.class)
		return 0;

	i = to_sas_internal(shost->transportt);
	return &i->t.host_attrs.ac == cont;
}

static int do_sas_phy_delete(struct device *dev, void *data)
{
	if (scsi_is_sas_phy(dev))
		sas_phy_delete(dev_to_phy(dev));
	return 0;
}

/**
 * sas_remove_host  --  tear down a Scsi_Host's SAS data structures
 * @shost:	Scsi Host that is torn down
 *
 * Removes all SAS PHYs and remote PHYs for a given Scsi_Host.
 * Must be called just before scsi_remove_host for SAS HBAs.
 */
void sas_remove_host(struct Scsi_Host *shost)
{
	device_for_each_child(&shost->shost_gendev, NULL, do_sas_phy_delete);
}
EXPORT_SYMBOL(sas_remove_host);


/*
 * SAS Port attributes
 */

#define sas_phy_show_simple(field, name, format_string, cast)		\
static ssize_t								\
show_sas_phy_##name(struct class_device *cdev, char *buf)		\
{									\
	struct sas_phy *phy = transport_class_to_phy(cdev);		\
									\
	return snprintf(buf, 20, format_string, cast phy->field);	\
}

#define sas_phy_simple_attr(field, name, format_string, type)		\
	sas_phy_show_simple(field, name, format_string, (type))	\
static CLASS_DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)

#define sas_phy_show_protocol(field, name)				\
static ssize_t								\
show_sas_phy_##name(struct class_device *cdev, char *buf)		\
{									\
	struct sas_phy *phy = transport_class_to_phy(cdev);		\
									\
	if (!phy->field)						\
		return snprintf(buf, 20, "none\n");			\
	return get_sas_protocol_names(phy->field, buf);		\
}

#define sas_phy_protocol_attr(field, name)				\
	sas_phy_show_protocol(field, name)				\
static CLASS_DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)

#define sas_phy_show_linkspeed(field)					\
static ssize_t								\
show_sas_phy_##field(struct class_device *cdev, char *buf)		\
{									\
	struct sas_phy *phy = transport_class_to_phy(cdev);		\
									\
	return get_sas_linkspeed_names(phy->field, buf);		\
}

#define sas_phy_linkspeed_attr(field)					\
	sas_phy_show_linkspeed(field)					\
static CLASS_DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)

static ssize_t
show_sas_device_type(struct class_device *cdev, char *buf)
{
	struct sas_phy *phy = transport_class_to_phy(cdev);

	if (!phy->identify.device_type)
		return snprintf(buf, 20, "none\n");
	return get_sas_device_type_names(phy->identify.device_type, buf);
}

static CLASS_DEVICE_ATTR(device_type, S_IRUGO, show_sas_device_type, NULL);

sas_phy_protocol_attr(identify.initiator_port_protocols,
		initiator_port_protocols);
sas_phy_protocol_attr(identify.target_port_protocols,
		target_port_protocols);
sas_phy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
		unsigned long long);
sas_phy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
sas_phy_simple_attr(port_identifier, port_identifier, "%d\n", u8);
sas_phy_linkspeed_attr(negotiated_linkrate);
sas_phy_linkspeed_attr(minimum_linkrate_hw);
sas_phy_linkspeed_attr(minimum_linkrate);
sas_phy_linkspeed_attr(maximum_linkrate_hw);
sas_phy_linkspeed_attr(maximum_linkrate);


static DECLARE_TRANSPORT_CLASS(sas_phy_class,
		"sas_phy", NULL, NULL, NULL);

static int sas_phy_match(struct attribute_container *cont, struct device *dev)
{
	struct Scsi_Host *shost;
	struct sas_internal *i;

	if (!scsi_is_sas_phy(dev))
		return 0;
	shost = dev_to_shost(dev->parent);

	if (!shost->transportt)
		return 0;
	if (shost->transportt->host_attrs.ac.class !=
			&sas_host_class.class)
		return 0;

	i = to_sas_internal(shost->transportt);
	return &i->phy_attr_cont.ac == cont;
}

static void sas_phy_release(struct device *dev)
{
	struct sas_phy *phy = dev_to_phy(dev);

	put_device(dev->parent);
	kfree(phy);
}

/**
 * sas_phy_alloc  --  allocates and initialize a SAS PHY structure
 * @parent:	Parent device
 * @number:	Port number
 *
 * Allocates an SAS PHY structure.  It will be added in the device tree
 * below the device specified by @parent, which has to be either a Scsi_Host
 * or sas_rphy.
 *
 * Returns:
 *	SAS PHY allocated or %NULL if the allocation failed.
 */
struct sas_phy *sas_phy_alloc(struct device *parent, int number)
{
	struct Scsi_Host *shost = dev_to_shost(parent);
	struct sas_phy *phy;

	phy = kmalloc(sizeof(*phy), GFP_KERNEL);
	if (!phy)
		return NULL;
	memset(phy, 0, sizeof(*phy));

	get_device(parent);

	phy->number = number;

	device_initialize(&phy->dev);
	phy->dev.parent = get_device(parent);
	phy->dev.release = sas_phy_release;
	sprintf(phy->dev.bus_id, "phy-%d:%d", shost->host_no, number);

	transport_setup_device(&phy->dev);

	return phy;
}
EXPORT_SYMBOL(sas_phy_alloc);

/**
 * sas_phy_add  --  add a SAS PHY to the device hierachy
 * @phy:	The PHY to be added
 *
 * Publishes a SAS PHY to the rest of the system.
 */
int sas_phy_add(struct sas_phy *phy)
{
	int error;

	error = device_add(&phy->dev);
	if (!error) {
		transport_add_device(&phy->dev);
		transport_configure_device(&phy->dev);
	}

	return error;
}
EXPORT_SYMBOL(sas_phy_add);

/**
 * sas_phy_free  --  free a SAS PHY
 * @phy:	SAS PHY to free
 *
 * Frees the specified SAS PHY.
 *
 * Note:
 *   This function must only be called on a PHY that has not
 *   sucessfully been added using sas_phy_add().
 */
void sas_phy_free(struct sas_phy *phy)
{
	transport_destroy_device(&phy->dev);
	put_device(phy->dev.parent);
	put_device(phy->dev.parent);
	put_device(phy->dev.parent);
	kfree(phy);
}
EXPORT_SYMBOL(sas_phy_free);

/**
 * sas_phy_delete  --  remove SAS PHY
 * @phy:	SAS PHY to remove
 *
 * Removes the specified SAS PHY.  If the SAS PHY has an
 * associated remote PHY it is removed before.
 */
void
sas_phy_delete(struct sas_phy *phy)
{
	struct device *dev = &phy->dev;

	if (phy->rphy)
		sas_rphy_delete(phy->rphy);

	transport_remove_device(dev);
	device_del(dev);
	transport_destroy_device(dev);
	put_device(dev->parent);
}
EXPORT_SYMBOL(sas_phy_delete);

/**
 * scsi_is_sas_phy  --  check if a struct device represents a SAS PHY
 * @dev:	device to check
 *
 * Returns:
 *	%1 if the device represents a SAS PHY, %0 else
 */
int scsi_is_sas_phy(const struct device *dev)
{
	return dev->release == sas_phy_release;
}
EXPORT_SYMBOL(scsi_is_sas_phy);

/*
 * SAS remote PHY attributes.
 */

#define sas_rphy_show_simple(field, name, format_string, cast)		\
static ssize_t								\
show_sas_rphy_##name(struct class_device *cdev, char *buf)		\
{									\
	struct sas_rphy *rphy = transport_class_to_rphy(cdev);	\
									\
	return snprintf(buf, 20, format_string, cast rphy->field);	\
}

#define sas_rphy_simple_attr(field, name, format_string, type)		\
	sas_rphy_show_simple(field, name, format_string, (type))	\
static SAS_CLASS_DEVICE_ATTR(rphy, name, S_IRUGO, 			\
		show_sas_rphy_##name, NULL)

#define sas_rphy_show_protocol(field, name)				\
static ssize_t								\
show_sas_rphy_##name(struct class_device *cdev, char *buf)		\
{									\
	struct sas_rphy *rphy = transport_class_to_rphy(cdev);	\
									\
	if (!rphy->field)					\
		return snprintf(buf, 20, "none\n");			\
	return get_sas_protocol_names(rphy->field, buf);	\
}

#define sas_rphy_protocol_attr(field, name)				\
	sas_rphy_show_protocol(field, name)				\
static SAS_CLASS_DEVICE_ATTR(rphy, name, S_IRUGO,			\
		show_sas_rphy_##name, NULL)

static ssize_t
show_sas_rphy_device_type(struct class_device *cdev, char *buf)
{
	struct sas_rphy *rphy = transport_class_to_rphy(cdev);

	if (!rphy->identify.device_type)
		return snprintf(buf, 20, "none\n");
	return get_sas_device_type_names(
			rphy->identify.device_type, buf);
}

static SAS_CLASS_DEVICE_ATTR(rphy, device_type, S_IRUGO,
		show_sas_rphy_device_type, NULL);

sas_rphy_protocol_attr(identify.initiator_port_protocols,
		initiator_port_protocols);
sas_rphy_protocol_attr(identify.target_port_protocols, target_port_protocols);
sas_rphy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
		unsigned long long);
sas_rphy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);

static DECLARE_TRANSPORT_CLASS(sas_rphy_class,
		"sas_rphy", NULL, NULL, NULL);

static int sas_rphy_match(struct attribute_container *cont, struct device *dev)
{
	struct Scsi_Host *shost;
	struct sas_internal *i;

	if (!scsi_is_sas_rphy(dev))
		return 0;
	shost = dev_to_shost(dev->parent->parent);

	if (!shost->transportt)
		return 0;
	if (shost->transportt->host_attrs.ac.class !=
			&sas_host_class.class)
		return 0;

	i = to_sas_internal(shost->transportt);
	return &i->rphy_attr_cont.ac == cont;
}

static void sas_rphy_release(struct device *dev)
{
	struct sas_rphy *rphy = dev_to_rphy(dev);

	put_device(dev->parent);
	kfree(rphy);
}

/**
 * sas_rphy_alloc  --  allocates and initialize a SAS remote PHY structure
 * @parent:		SAS PHY this remote PHY is conneted to
 *
 * Allocates an SAS remote PHY structure, connected to @parent.
 *
 * Returns:
 *	SAS PHY allocated or %NULL if the allocation failed.
 */
struct sas_rphy *sas_rphy_alloc(struct sas_phy *parent)
{
	struct Scsi_Host *shost = dev_to_shost(&parent->dev);
	struct sas_rphy *rphy;

	rphy = kmalloc(sizeof(*rphy), GFP_KERNEL);
	if (!rphy) {
		put_device(&parent->dev);
		return NULL;
	}
	memset(rphy, 0, sizeof(*rphy));

	device_initialize(&rphy->dev);
	rphy->dev.parent = get_device(&parent->dev);
	rphy->dev.release = sas_rphy_release;
	sprintf(rphy->dev.bus_id, "rphy-%d:%d",
		shost->host_no, parent->number);
	transport_setup_device(&rphy->dev);

	return rphy;
}
EXPORT_SYMBOL(sas_rphy_alloc);

/**
 * sas_rphy_add  --  add a SAS remote PHY to the device hierachy
 * @rphy:	The remote PHY to be added
 *
 * Publishes a SAS remote PHY to the rest of the system.
 */
int sas_rphy_add(struct sas_rphy *rphy)
{
	struct sas_phy *parent = dev_to_phy(rphy->dev.parent);
	struct Scsi_Host *shost = dev_to_shost(parent->dev.parent);
	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
	struct sas_identify *identify = &rphy->identify;
	int error;

	if (parent->rphy)
		return -ENXIO;
	parent->rphy = rphy;

	error = device_add(&rphy->dev);
	if (error)
		return error;
	transport_add_device(&rphy->dev);
	transport_configure_device(&rphy->dev);

	spin_lock(&sas_host->lock);
	list_add_tail(&rphy->list, &sas_host->rphy_list);
	if (identify->device_type == SAS_END_DEVICE &&
	    (identify->target_port_protocols &
	     (SAS_PROTOCOL_SSP|SAS_PROTOCOL_STP|SAS_PROTOCOL_SATA)))
		rphy->scsi_target_id = sas_host->next_target_id++;
	else
		rphy->scsi_target_id = -1;
	spin_unlock(&sas_host->lock);

	if (rphy->scsi_target_id != -1) {
		scsi_scan_target(&rphy->dev, parent->number,
				rphy->scsi_target_id, ~0, 0);
	}

	return 0;
}
EXPORT_SYMBOL(sas_rphy_add);

/**
 * sas_rphy_free  --  free a SAS remote PHY
 * @rphy	SAS remote PHY to free
 *
 * Frees the specified SAS remote PHY.
 *
 * Note:
 *   This function must only be called on a remote
 *   PHY that has not sucessfully been added using
 *   sas_rphy_add().
 */
void sas_rphy_free(struct sas_rphy *rphy)
{
	struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent->parent);
	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);

	spin_lock(&sas_host->lock);
	list_del(&rphy->list);
	spin_unlock(&sas_host->lock);

	transport_destroy_device(&rphy->dev);
	put_device(rphy->dev.parent);
	put_device(rphy->dev.parent);
	put_device(rphy->dev.parent);
	kfree(rphy);
}
EXPORT_SYMBOL(sas_rphy_free);

/**
 * sas_rphy_delete  --  remove SAS remote PHY
 * @rphy:	SAS remote PHY to remove
 *
 * Removes the specified SAS remote PHY.
 */
void
sas_rphy_delete(struct sas_rphy *rphy)
{
	struct device *dev = &rphy->dev;
	struct sas_phy *parent = dev_to_phy(dev->parent);
	struct Scsi_Host *shost = dev_to_shost(parent->dev.parent);
	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);

	scsi_remove_target(dev);

	transport_remove_device(dev);
	device_del(dev);
	transport_destroy_device(dev);

	spin_lock(&sas_host->lock);
	list_del(&rphy->list);
	spin_unlock(&sas_host->lock);

	put_device(&parent->dev);
}
EXPORT_SYMBOL(sas_rphy_delete);

/**
 * scsi_is_sas_rphy  --  check if a struct device represents a SAS remote PHY
 * @dev:	device to check
 *
 * Returns:
 *	%1 if the device represents a SAS remote PHY, %0 else
 */
int scsi_is_sas_rphy(const struct device *dev)
{
	return dev->release == sas_rphy_release;
}
EXPORT_SYMBOL(scsi_is_sas_rphy);


/*
 * SCSI scan helper
 */

static struct device *sas_target_parent(struct Scsi_Host *shost,
					int channel, uint id)
{
	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
	struct sas_rphy *rphy;
	struct device *dev = NULL;

	spin_lock(&sas_host->lock);
	list_for_each_entry(rphy, &sas_host->rphy_list, list) {
		struct sas_phy *parent = dev_to_phy(rphy->dev.parent);
		if (parent->number == channel &&
		    rphy->scsi_target_id == id)
			dev = &rphy->dev;
	}
	spin_unlock(&sas_host->lock);

	return dev;
}


/*
 * Setup / Teardown code
 */

#define SETUP_RPORT_ATTRIBUTE(field)					\
	i->private_rphy_attrs[count] = class_device_attr_##field;	\
	i->private_rphy_attrs[count].attr.mode = S_IRUGO;		\
	i->private_rphy_attrs[count].store = NULL;			\
	i->rphy_attrs[count] = &i->private_rphy_attrs[count];	\
	count++

#define SETUP_PORT_ATTRIBUTE(field)					\
	i->private_phy_attrs[count] = class_device_attr_##field;	\
        i->private_phy_attrs[count].attr.mode = S_IRUGO;		\
        i->private_phy_attrs[count].store = NULL;			\
        i->phy_attrs[count] = &i->private_phy_attrs[count];		\
	count++


/**
 * sas_attach_transport  --  instantiate SAS transport template
 * @ft:		SAS transport class function template
 */
struct scsi_transport_template *
sas_attach_transport(struct sas_function_template *ft)
{
	struct sas_internal *i;
	int count;

	i = kmalloc(sizeof(struct sas_internal), GFP_KERNEL);
	if (!i)
		return NULL;
	memset(i, 0, sizeof(struct sas_internal));

	i->t.target_parent = sas_target_parent;

	i->t.host_attrs.ac.attrs = &i->host_attrs[0];
	i->t.host_attrs.ac.class = &sas_host_class.class;
	i->t.host_attrs.ac.match = sas_host_match;
	transport_container_register(&i->t.host_attrs);
	i->t.host_size = sizeof(struct sas_host_attrs);

	i->phy_attr_cont.ac.class = &sas_phy_class.class;
	i->phy_attr_cont.ac.attrs = &i->phy_attrs[0];
	i->phy_attr_cont.ac.match = sas_phy_match;
	transport_container_register(&i->phy_attr_cont);

	i->rphy_attr_cont.ac.class = &sas_rphy_class.class;
	i->rphy_attr_cont.ac.attrs = &i->rphy_attrs[0];
	i->rphy_attr_cont.ac.match = sas_rphy_match;
	transport_container_register(&i->rphy_attr_cont);

	i->f = ft;

	count = 0;
	i->host_attrs[count] = NULL;

	count = 0;
	SETUP_PORT_ATTRIBUTE(initiator_port_protocols);
	SETUP_PORT_ATTRIBUTE(target_port_protocols);
	SETUP_PORT_ATTRIBUTE(device_type);
	SETUP_PORT_ATTRIBUTE(sas_address);
	SETUP_PORT_ATTRIBUTE(phy_identifier);
	SETUP_PORT_ATTRIBUTE(port_identifier);
	SETUP_PORT_ATTRIBUTE(negotiated_linkrate);
	SETUP_PORT_ATTRIBUTE(minimum_linkrate_hw);
	SETUP_PORT_ATTRIBUTE(minimum_linkrate);
	SETUP_PORT_ATTRIBUTE(maximum_linkrate_hw);
	SETUP_PORT_ATTRIBUTE(maximum_linkrate);
	i->phy_attrs[count] = NULL;

	count = 0;
	SETUP_RPORT_ATTRIBUTE(rphy_initiator_port_protocols);
	SETUP_RPORT_ATTRIBUTE(rphy_target_port_protocols);
	SETUP_RPORT_ATTRIBUTE(rphy_device_type);
	SETUP_RPORT_ATTRIBUTE(rphy_sas_address);
	SETUP_RPORT_ATTRIBUTE(rphy_phy_identifier);
	i->rphy_attrs[count] = NULL;

	return &i->t;
}
EXPORT_SYMBOL(sas_attach_transport);

/**
 * sas_release_transport  --  release SAS transport template instance
 * @t:		transport template instance
 */
void sas_release_transport(struct scsi_transport_template *t)
{
	struct sas_internal *i = to_sas_internal(t);

	transport_container_unregister(&i->t.host_attrs);
	transport_container_unregister(&i->phy_attr_cont);
	transport_container_unregister(&i->rphy_attr_cont);

	kfree(i);
}
EXPORT_SYMBOL(sas_release_transport);

static __init int sas_transport_init(void)
{
	int error;

	error = transport_class_register(&sas_host_class);
	if (error)
		goto out;
	error = transport_class_register(&sas_phy_class);
	if (error)
		goto out_unregister_transport;
	error = transport_class_register(&sas_rphy_class);
	if (error)
		goto out_unregister_phy;

	return 0;

 out_unregister_phy:
	transport_class_unregister(&sas_phy_class);
 out_unregister_transport:
	transport_class_unregister(&sas_host_class);
 out:
	return error;

}

static void __exit sas_transport_exit(void)
{
	transport_class_unregister(&sas_host_class);
	transport_class_unregister(&sas_phy_class);
	transport_class_unregister(&sas_rphy_class);
}

MODULE_AUTHOR("Christoph Hellwig");
MODULE_DESCRIPTION("SAS Transphy Attributes");
MODULE_LICENSE("GPL");

module_init(sas_transport_init);
module_exit(sas_transport_exit);