1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2005-2006 Dell Inc.
4  *
5  * Serial Attached SCSI (SAS) transport class.
6  *
7  * The SAS transport class contains common code to deal with SAS HBAs,
8  * an aproximated representation of SAS topologies in the driver model,
9  * and various sysfs attributes to expose these topologies and management
10  * interfaces to userspace.
11  *
12  * In addition to the basic SCSI core objects this transport class
13  * introduces two additional intermediate objects:  The SAS PHY
14  * as represented by struct sas_phy defines an "outgoing" PHY on
15  * a SAS HBA or Expander, and the SAS remote PHY represented by
16  * struct sas_rphy defines an "incoming" PHY on a SAS Expander or
17  * end device.  Note that this is purely a software concept, the
18  * underlying hardware for a PHY and a remote PHY is the exactly
19  * the same.
20  *
21  * There is no concept of a SAS port in this code, users can see
22  * what PHYs form a wide port based on the port_identifier attribute,
23  * which is the same for all PHYs in a port.
24  */
25 
26 #include <linux/init.h>
27 #include <linux/module.h>
28 #include <linux/jiffies.h>
29 #include <linux/err.h>
30 #include <linux/slab.h>
31 #include <linux/string.h>
32 #include <linux/blkdev.h>
33 #include <linux/bsg.h>
34 
35 #include <scsi/scsi.h>
36 #include <scsi/scsi_cmnd.h>
37 #include <scsi/scsi_device.h>
38 #include <scsi/scsi_host.h>
39 #include <scsi/scsi_transport.h>
40 #include <scsi/scsi_transport_sas.h>
41 
42 #include "scsi_sas_internal.h"
43 struct sas_host_attrs {
44 	struct list_head rphy_list;
45 	struct mutex lock;
46 	struct request_queue *q;
47 	u32 next_target_id;
48 	u32 next_expander_id;
49 	int next_port_id;
50 };
51 #define to_sas_host_attrs(host)	((struct sas_host_attrs *)(host)->shost_data)
52 
53 
54 /*
55  * Hack to allow attributes of the same name in different objects.
56  */
57 #define SAS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
58 	struct device_attribute dev_attr_##_prefix##_##_name = \
59 	__ATTR(_name,_mode,_show,_store)
60 
61 
62 /*
63  * Pretty printing helpers
64  */
65 
66 #define sas_bitfield_name_match(title, table)			\
67 static ssize_t							\
68 get_sas_##title##_names(u32 table_key, char *buf)		\
69 {								\
70 	char *prefix = "";					\
71 	ssize_t len = 0;					\
72 	int i;							\
73 								\
74 	for (i = 0; i < ARRAY_SIZE(table); i++) {		\
75 		if (table[i].value & table_key) {		\
76 			len += sprintf(buf + len, "%s%s",	\
77 				prefix, table[i].name);		\
78 			prefix = ", ";				\
79 		}						\
80 	}							\
81 	len += sprintf(buf + len, "\n");			\
82 	return len;						\
83 }
84 
85 #define sas_bitfield_name_set(title, table)			\
86 static ssize_t							\
87 set_sas_##title##_names(u32 *table_key, const char *buf)	\
88 {								\
89 	ssize_t len = 0;					\
90 	int i;							\
91 								\
92 	for (i = 0; i < ARRAY_SIZE(table); i++) {		\
93 		len = strlen(table[i].name);			\
94 		if (strncmp(buf, table[i].name, len) == 0 &&	\
95 		    (buf[len] == '\n' || buf[len] == '\0')) {	\
96 			*table_key = table[i].value;		\
97 			return 0;				\
98 		}						\
99 	}							\
100 	return -EINVAL;						\
101 }
102 
103 #define sas_bitfield_name_search(title, table)			\
104 static ssize_t							\
105 get_sas_##title##_names(u32 table_key, char *buf)		\
106 {								\
107 	ssize_t len = 0;					\
108 	int i;							\
109 								\
110 	for (i = 0; i < ARRAY_SIZE(table); i++) {		\
111 		if (table[i].value == table_key) {		\
112 			len += sprintf(buf + len, "%s",		\
113 				table[i].name);			\
114 			break;					\
115 		}						\
116 	}							\
117 	len += sprintf(buf + len, "\n");			\
118 	return len;						\
119 }
120 
121 static struct {
122 	u32		value;
123 	char		*name;
124 } sas_device_type_names[] = {
125 	{ SAS_PHY_UNUSED,		"unused" },
126 	{ SAS_END_DEVICE,		"end device" },
127 	{ SAS_EDGE_EXPANDER_DEVICE,	"edge expander" },
128 	{ SAS_FANOUT_EXPANDER_DEVICE,	"fanout expander" },
129 };
130 sas_bitfield_name_search(device_type, sas_device_type_names)
131 
132 
133 static struct {
134 	u32		value;
135 	char		*name;
136 } sas_protocol_names[] = {
137 	{ SAS_PROTOCOL_SATA,		"sata" },
138 	{ SAS_PROTOCOL_SMP,		"smp" },
139 	{ SAS_PROTOCOL_STP,		"stp" },
140 	{ SAS_PROTOCOL_SSP,		"ssp" },
141 };
142 sas_bitfield_name_match(protocol, sas_protocol_names)
143 
144 static struct {
145 	u32		value;
146 	char		*name;
147 } sas_linkspeed_names[] = {
148 	{ SAS_LINK_RATE_UNKNOWN,	"Unknown" },
149 	{ SAS_PHY_DISABLED,		"Phy disabled" },
150 	{ SAS_LINK_RATE_FAILED,		"Link Rate failed" },
151 	{ SAS_SATA_SPINUP_HOLD,		"Spin-up hold" },
152 	{ SAS_LINK_RATE_1_5_GBPS,	"1.5 Gbit" },
153 	{ SAS_LINK_RATE_3_0_GBPS,	"3.0 Gbit" },
154 	{ SAS_LINK_RATE_6_0_GBPS,	"6.0 Gbit" },
155 	{ SAS_LINK_RATE_12_0_GBPS,	"12.0 Gbit" },
156 	{ SAS_LINK_RATE_22_5_GBPS,	"22.5 Gbit" },
157 };
158 sas_bitfield_name_search(linkspeed, sas_linkspeed_names)
159 sas_bitfield_name_set(linkspeed, sas_linkspeed_names)
160 
161 static struct sas_end_device *sas_sdev_to_rdev(struct scsi_device *sdev)
162 {
163 	struct sas_rphy *rphy = target_to_rphy(sdev->sdev_target);
164 	struct sas_end_device *rdev;
165 
166 	BUG_ON(rphy->identify.device_type != SAS_END_DEVICE);
167 
168 	rdev = rphy_to_end_device(rphy);
169 	return rdev;
170 }
171 
172 static int sas_smp_dispatch(struct bsg_job *job)
173 {
174 	struct Scsi_Host *shost = dev_to_shost(job->dev);
175 	struct sas_rphy *rphy = NULL;
176 
177 	if (!scsi_is_host_device(job->dev))
178 		rphy = dev_to_rphy(job->dev);
179 
180 	if (!job->reply_payload.payload_len) {
181 		dev_warn(job->dev, "space for a smp response is missing\n");
182 		bsg_job_done(job, -EINVAL, 0);
183 		return 0;
184 	}
185 
186 	to_sas_internal(shost->transportt)->f->smp_handler(job, shost, rphy);
187 	return 0;
188 }
189 
190 static int sas_bsg_initialize(struct Scsi_Host *shost, struct sas_rphy *rphy)
191 {
192 	struct request_queue *q;
193 
194 	if (!to_sas_internal(shost->transportt)->f->smp_handler) {
195 		printk("%s can't handle SMP requests\n", shost->hostt->name);
196 		return 0;
197 	}
198 
199 	if (rphy) {
200 		q = bsg_setup_queue(&rphy->dev, dev_name(&rphy->dev),
201 				sas_smp_dispatch, NULL, 0);
202 		if (IS_ERR(q))
203 			return PTR_ERR(q);
204 		rphy->q = q;
205 	} else {
206 		char name[20];
207 
208 		snprintf(name, sizeof(name), "sas_host%d", shost->host_no);
209 		q = bsg_setup_queue(&shost->shost_gendev, name,
210 				sas_smp_dispatch, NULL, 0);
211 		if (IS_ERR(q))
212 			return PTR_ERR(q);
213 		to_sas_host_attrs(shost)->q = q;
214 	}
215 
216 	return 0;
217 }
218 
219 /*
220  * SAS host attributes
221  */
222 
223 static int sas_host_setup(struct transport_container *tc, struct device *dev,
224 			  struct device *cdev)
225 {
226 	struct Scsi_Host *shost = dev_to_shost(dev);
227 	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
228 	struct device *dma_dev = shost->dma_dev;
229 
230 	INIT_LIST_HEAD(&sas_host->rphy_list);
231 	mutex_init(&sas_host->lock);
232 	sas_host->next_target_id = 0;
233 	sas_host->next_expander_id = 0;
234 	sas_host->next_port_id = 0;
235 
236 	if (sas_bsg_initialize(shost, NULL))
237 		dev_printk(KERN_ERR, dev, "fail to a bsg device %d\n",
238 			   shost->host_no);
239 
240 	if (dma_dev->dma_mask) {
241 		shost->opt_sectors = min_t(unsigned int, shost->max_sectors,
242 				dma_opt_mapping_size(dma_dev) >> SECTOR_SHIFT);
243 	}
244 
245 	return 0;
246 }
247 
248 static int sas_host_remove(struct transport_container *tc, struct device *dev,
249 			   struct device *cdev)
250 {
251 	struct Scsi_Host *shost = dev_to_shost(dev);
252 	struct request_queue *q = to_sas_host_attrs(shost)->q;
253 
254 	bsg_remove_queue(q);
255 	return 0;
256 }
257 
258 static DECLARE_TRANSPORT_CLASS(sas_host_class,
259 		"sas_host", sas_host_setup, sas_host_remove, NULL);
260 
261 static int sas_host_match(struct attribute_container *cont,
262 			    struct device *dev)
263 {
264 	struct Scsi_Host *shost;
265 	struct sas_internal *i;
266 
267 	if (!scsi_is_host_device(dev))
268 		return 0;
269 	shost = dev_to_shost(dev);
270 
271 	if (!shost->transportt)
272 		return 0;
273 	if (shost->transportt->host_attrs.ac.class !=
274 			&sas_host_class.class)
275 		return 0;
276 
277 	i = to_sas_internal(shost->transportt);
278 	return &i->t.host_attrs.ac == cont;
279 }
280 
281 static int do_sas_phy_delete(struct device *dev, void *data)
282 {
283 	int pass = (int)(unsigned long)data;
284 
285 	if (pass == 0 && scsi_is_sas_port(dev))
286 		sas_port_delete(dev_to_sas_port(dev));
287 	else if (pass == 1 && scsi_is_sas_phy(dev))
288 		sas_phy_delete(dev_to_phy(dev));
289 	return 0;
290 }
291 
292 /**
293  * sas_remove_children  -  tear down a devices SAS data structures
294  * @dev:	device belonging to the sas object
295  *
296  * Removes all SAS PHYs and remote PHYs for a given object
297  */
298 void sas_remove_children(struct device *dev)
299 {
300 	device_for_each_child(dev, (void *)0, do_sas_phy_delete);
301 	device_for_each_child(dev, (void *)1, do_sas_phy_delete);
302 }
303 EXPORT_SYMBOL(sas_remove_children);
304 
305 /**
306  * sas_remove_host  -  tear down a Scsi_Host's SAS data structures
307  * @shost:	Scsi Host that is torn down
308  *
309  * Removes all SAS PHYs and remote PHYs for a given Scsi_Host and remove the
310  * Scsi_Host as well.
311  *
312  * Note: Do not call scsi_remove_host() on the Scsi_Host any more, as it is
313  * already removed.
314  */
315 void sas_remove_host(struct Scsi_Host *shost)
316 {
317 	sas_remove_children(&shost->shost_gendev);
318 	scsi_remove_host(shost);
319 }
320 EXPORT_SYMBOL(sas_remove_host);
321 
322 /**
323  * sas_get_address - return the SAS address of the device
324  * @sdev: scsi device
325  *
326  * Returns the SAS address of the scsi device
327  */
328 u64 sas_get_address(struct scsi_device *sdev)
329 {
330 	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
331 
332 	return rdev->rphy.identify.sas_address;
333 }
334 EXPORT_SYMBOL(sas_get_address);
335 
336 /**
337  * sas_tlr_supported - checking TLR bit in vpd 0x90
338  * @sdev: scsi device struct
339  *
340  * Check Transport Layer Retries are supported or not.
341  * If vpd page 0x90 is present, TRL is supported.
342  *
343  */
344 unsigned int
345 sas_tlr_supported(struct scsi_device *sdev)
346 {
347 	const int vpd_len = 32;
348 	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
349 	char *buffer = kzalloc(vpd_len, GFP_KERNEL);
350 	int ret = 0;
351 
352 	if (!buffer)
353 		goto out;
354 
355 	if (scsi_get_vpd_page(sdev, 0x90, buffer, vpd_len))
356 		goto out;
357 
358 	/*
359 	 * Magic numbers: the VPD Protocol page (0x90)
360 	 * has a 4 byte header and then one entry per device port
361 	 * the TLR bit is at offset 8 on each port entry
362 	 * if we take the first port, that's at total offset 12
363 	 */
364 	ret = buffer[12] & 0x01;
365 
366  out:
367 	kfree(buffer);
368 	rdev->tlr_supported = ret;
369 	return ret;
370 
371 }
372 EXPORT_SYMBOL_GPL(sas_tlr_supported);
373 
374 /**
375  * sas_disable_tlr - setting TLR flags
376  * @sdev: scsi device struct
377  *
378  * Seting tlr_enabled flag to 0.
379  *
380  */
381 void
382 sas_disable_tlr(struct scsi_device *sdev)
383 {
384 	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
385 
386 	rdev->tlr_enabled = 0;
387 }
388 EXPORT_SYMBOL_GPL(sas_disable_tlr);
389 
390 /**
391  * sas_enable_tlr - setting TLR flags
392  * @sdev: scsi device struct
393  *
394  * Seting tlr_enabled flag 1.
395  *
396  */
397 void sas_enable_tlr(struct scsi_device *sdev)
398 {
399 	unsigned int tlr_supported = 0;
400 	tlr_supported  = sas_tlr_supported(sdev);
401 
402 	if (tlr_supported) {
403 		struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
404 
405 		rdev->tlr_enabled = 1;
406 	}
407 
408 	return;
409 }
410 EXPORT_SYMBOL_GPL(sas_enable_tlr);
411 
412 unsigned int sas_is_tlr_enabled(struct scsi_device *sdev)
413 {
414 	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
415 	return rdev->tlr_enabled;
416 }
417 EXPORT_SYMBOL_GPL(sas_is_tlr_enabled);
418 
419 /*
420  * SAS Phy attributes
421  */
422 
423 #define sas_phy_show_simple(field, name, format_string, cast)		\
424 static ssize_t								\
425 show_sas_phy_##name(struct device *dev, 				\
426 		    struct device_attribute *attr, char *buf)		\
427 {									\
428 	struct sas_phy *phy = transport_class_to_phy(dev);		\
429 									\
430 	return snprintf(buf, 20, format_string, cast phy->field);	\
431 }
432 
433 #define sas_phy_simple_attr(field, name, format_string, type)		\
434 	sas_phy_show_simple(field, name, format_string, (type))	\
435 static DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
436 
437 #define sas_phy_show_protocol(field, name)				\
438 static ssize_t								\
439 show_sas_phy_##name(struct device *dev, 				\
440 		    struct device_attribute *attr, char *buf)		\
441 {									\
442 	struct sas_phy *phy = transport_class_to_phy(dev);		\
443 									\
444 	if (!phy->field)						\
445 		return snprintf(buf, 20, "none\n");			\
446 	return get_sas_protocol_names(phy->field, buf);		\
447 }
448 
449 #define sas_phy_protocol_attr(field, name)				\
450 	sas_phy_show_protocol(field, name)				\
451 static DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
452 
453 #define sas_phy_show_linkspeed(field)					\
454 static ssize_t								\
455 show_sas_phy_##field(struct device *dev, 				\
456 		     struct device_attribute *attr, char *buf)		\
457 {									\
458 	struct sas_phy *phy = transport_class_to_phy(dev);		\
459 									\
460 	return get_sas_linkspeed_names(phy->field, buf);		\
461 }
462 
463 /* Fudge to tell if we're minimum or maximum */
464 #define sas_phy_store_linkspeed(field)					\
465 static ssize_t								\
466 store_sas_phy_##field(struct device *dev, 				\
467 		      struct device_attribute *attr, 			\
468 		      const char *buf,	size_t count)			\
469 {									\
470 	struct sas_phy *phy = transport_class_to_phy(dev);		\
471 	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);	\
472 	struct sas_internal *i = to_sas_internal(shost->transportt);	\
473 	u32 value;							\
474 	struct sas_phy_linkrates rates = {0};				\
475 	int error;							\
476 									\
477 	error = set_sas_linkspeed_names(&value, buf);			\
478 	if (error)							\
479 		return error;						\
480 	rates.field = value;						\
481 	error = i->f->set_phy_speed(phy, &rates);			\
482 									\
483 	return error ? error : count;					\
484 }
485 
486 #define sas_phy_linkspeed_rw_attr(field)				\
487 	sas_phy_show_linkspeed(field)					\
488 	sas_phy_store_linkspeed(field)					\
489 static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field,		\
490 	store_sas_phy_##field)
491 
492 #define sas_phy_linkspeed_attr(field)					\
493 	sas_phy_show_linkspeed(field)					\
494 static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
495 
496 
497 #define sas_phy_show_linkerror(field)					\
498 static ssize_t								\
499 show_sas_phy_##field(struct device *dev, 				\
500 		     struct device_attribute *attr, char *buf)		\
501 {									\
502 	struct sas_phy *phy = transport_class_to_phy(dev);		\
503 	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);	\
504 	struct sas_internal *i = to_sas_internal(shost->transportt);	\
505 	int error;							\
506 									\
507 	error = i->f->get_linkerrors ? i->f->get_linkerrors(phy) : 0;	\
508 	if (error)							\
509 		return error;						\
510 	return snprintf(buf, 20, "%u\n", phy->field);			\
511 }
512 
513 #define sas_phy_linkerror_attr(field)					\
514 	sas_phy_show_linkerror(field)					\
515 static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
516 
517 
518 static ssize_t
519 show_sas_device_type(struct device *dev,
520 		     struct device_attribute *attr, char *buf)
521 {
522 	struct sas_phy *phy = transport_class_to_phy(dev);
523 
524 	if (!phy->identify.device_type)
525 		return snprintf(buf, 20, "none\n");
526 	return get_sas_device_type_names(phy->identify.device_type, buf);
527 }
528 static DEVICE_ATTR(device_type, S_IRUGO, show_sas_device_type, NULL);
529 
530 static ssize_t do_sas_phy_enable(struct device *dev,
531 		size_t count, int enable)
532 {
533 	struct sas_phy *phy = transport_class_to_phy(dev);
534 	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
535 	struct sas_internal *i = to_sas_internal(shost->transportt);
536 	int error;
537 
538 	error = i->f->phy_enable(phy, enable);
539 	if (error)
540 		return error;
541 	phy->enabled = enable;
542 	return count;
543 };
544 
545 static ssize_t
546 store_sas_phy_enable(struct device *dev, struct device_attribute *attr,
547 		     const char *buf, size_t count)
548 {
549 	if (count < 1)
550 		return -EINVAL;
551 
552 	switch (buf[0]) {
553 	case '0':
554 		do_sas_phy_enable(dev, count, 0);
555 		break;
556 	case '1':
557 		do_sas_phy_enable(dev, count, 1);
558 		break;
559 	default:
560 		return -EINVAL;
561 	}
562 
563 	return count;
564 }
565 
566 static ssize_t
567 show_sas_phy_enable(struct device *dev, struct device_attribute *attr,
568 		    char *buf)
569 {
570 	struct sas_phy *phy = transport_class_to_phy(dev);
571 
572 	return snprintf(buf, 20, "%d\n", phy->enabled);
573 }
574 
575 static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, show_sas_phy_enable,
576 			 store_sas_phy_enable);
577 
578 static ssize_t
579 do_sas_phy_reset(struct device *dev, size_t count, int hard_reset)
580 {
581 	struct sas_phy *phy = transport_class_to_phy(dev);
582 	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
583 	struct sas_internal *i = to_sas_internal(shost->transportt);
584 	int error;
585 
586 	error = i->f->phy_reset(phy, hard_reset);
587 	if (error)
588 		return error;
589 	phy->enabled = 1;
590 	return count;
591 };
592 
593 static ssize_t
594 store_sas_link_reset(struct device *dev, struct device_attribute *attr,
595 		     const char *buf, size_t count)
596 {
597 	return do_sas_phy_reset(dev, count, 0);
598 }
599 static DEVICE_ATTR(link_reset, S_IWUSR, NULL, store_sas_link_reset);
600 
601 static ssize_t
602 store_sas_hard_reset(struct device *dev, struct device_attribute *attr,
603 		     const char *buf, size_t count)
604 {
605 	return do_sas_phy_reset(dev, count, 1);
606 }
607 static DEVICE_ATTR(hard_reset, S_IWUSR, NULL, store_sas_hard_reset);
608 
609 sas_phy_protocol_attr(identify.initiator_port_protocols,
610 		initiator_port_protocols);
611 sas_phy_protocol_attr(identify.target_port_protocols,
612 		target_port_protocols);
613 sas_phy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
614 		unsigned long long);
615 sas_phy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
616 sas_phy_linkspeed_attr(negotiated_linkrate);
617 sas_phy_linkspeed_attr(minimum_linkrate_hw);
618 sas_phy_linkspeed_rw_attr(minimum_linkrate);
619 sas_phy_linkspeed_attr(maximum_linkrate_hw);
620 sas_phy_linkspeed_rw_attr(maximum_linkrate);
621 sas_phy_linkerror_attr(invalid_dword_count);
622 sas_phy_linkerror_attr(running_disparity_error_count);
623 sas_phy_linkerror_attr(loss_of_dword_sync_count);
624 sas_phy_linkerror_attr(phy_reset_problem_count);
625 
626 static int sas_phy_setup(struct transport_container *tc, struct device *dev,
627 			 struct device *cdev)
628 {
629 	struct sas_phy *phy = dev_to_phy(dev);
630 	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
631 	struct sas_internal *i = to_sas_internal(shost->transportt);
632 
633 	if (i->f->phy_setup)
634 		i->f->phy_setup(phy);
635 
636 	return 0;
637 }
638 
639 static DECLARE_TRANSPORT_CLASS(sas_phy_class,
640 		"sas_phy", sas_phy_setup, NULL, NULL);
641 
642 static int sas_phy_match(struct attribute_container *cont, struct device *dev)
643 {
644 	struct Scsi_Host *shost;
645 	struct sas_internal *i;
646 
647 	if (!scsi_is_sas_phy(dev))
648 		return 0;
649 	shost = dev_to_shost(dev->parent);
650 
651 	if (!shost->transportt)
652 		return 0;
653 	if (shost->transportt->host_attrs.ac.class !=
654 			&sas_host_class.class)
655 		return 0;
656 
657 	i = to_sas_internal(shost->transportt);
658 	return &i->phy_attr_cont.ac == cont;
659 }
660 
661 static void sas_phy_release(struct device *dev)
662 {
663 	struct sas_phy *phy = dev_to_phy(dev);
664 	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
665 	struct sas_internal *i = to_sas_internal(shost->transportt);
666 
667 	if (i->f->phy_release)
668 		i->f->phy_release(phy);
669 	put_device(dev->parent);
670 	kfree(phy);
671 }
672 
673 /**
674  * sas_phy_alloc  -  allocates and initialize a SAS PHY structure
675  * @parent:	Parent device
676  * @number:	Phy index
677  *
678  * Allocates an SAS PHY structure.  It will be added in the device tree
679  * below the device specified by @parent, which has to be either a Scsi_Host
680  * or sas_rphy.
681  *
682  * Returns:
683  *	SAS PHY allocated or %NULL if the allocation failed.
684  */
685 struct sas_phy *sas_phy_alloc(struct device *parent, int number)
686 {
687 	struct Scsi_Host *shost = dev_to_shost(parent);
688 	struct sas_phy *phy;
689 
690 	phy = kzalloc(sizeof(*phy), GFP_KERNEL);
691 	if (!phy)
692 		return NULL;
693 
694 	phy->number = number;
695 	phy->enabled = 1;
696 
697 	device_initialize(&phy->dev);
698 	phy->dev.parent = get_device(parent);
699 	phy->dev.release = sas_phy_release;
700 	INIT_LIST_HEAD(&phy->port_siblings);
701 	if (scsi_is_sas_expander_device(parent)) {
702 		struct sas_rphy *rphy = dev_to_rphy(parent);
703 		dev_set_name(&phy->dev, "phy-%d:%d:%d", shost->host_no,
704 			rphy->scsi_target_id, number);
705 	} else
706 		dev_set_name(&phy->dev, "phy-%d:%d", shost->host_no, number);
707 
708 	transport_setup_device(&phy->dev);
709 
710 	return phy;
711 }
712 EXPORT_SYMBOL(sas_phy_alloc);
713 
714 /**
715  * sas_phy_add  -  add a SAS PHY to the device hierarchy
716  * @phy:	The PHY to be added
717  *
718  * Publishes a SAS PHY to the rest of the system.
719  */
720 int sas_phy_add(struct sas_phy *phy)
721 {
722 	int error;
723 
724 	error = device_add(&phy->dev);
725 	if (error)
726 		return error;
727 
728 	error = transport_add_device(&phy->dev);
729 	if (error) {
730 		device_del(&phy->dev);
731 		return error;
732 	}
733 	transport_configure_device(&phy->dev);
734 
735 	return 0;
736 }
737 EXPORT_SYMBOL(sas_phy_add);
738 
739 /**
740  * sas_phy_free  -  free a SAS PHY
741  * @phy:	SAS PHY to free
742  *
743  * Frees the specified SAS PHY.
744  *
745  * Note:
746  *   This function must only be called on a PHY that has not
747  *   successfully been added using sas_phy_add().
748  */
749 void sas_phy_free(struct sas_phy *phy)
750 {
751 	transport_destroy_device(&phy->dev);
752 	put_device(&phy->dev);
753 }
754 EXPORT_SYMBOL(sas_phy_free);
755 
756 /**
757  * sas_phy_delete  -  remove SAS PHY
758  * @phy:	SAS PHY to remove
759  *
760  * Removes the specified SAS PHY.  If the SAS PHY has an
761  * associated remote PHY it is removed before.
762  */
763 void
764 sas_phy_delete(struct sas_phy *phy)
765 {
766 	struct device *dev = &phy->dev;
767 
768 	/* this happens if the phy is still part of a port when deleted */
769 	BUG_ON(!list_empty(&phy->port_siblings));
770 
771 	transport_remove_device(dev);
772 	device_del(dev);
773 	transport_destroy_device(dev);
774 	put_device(dev);
775 }
776 EXPORT_SYMBOL(sas_phy_delete);
777 
778 /**
779  * scsi_is_sas_phy  -  check if a struct device represents a SAS PHY
780  * @dev:	device to check
781  *
782  * Returns:
783  *	%1 if the device represents a SAS PHY, %0 else
784  */
785 int scsi_is_sas_phy(const struct device *dev)
786 {
787 	return dev->release == sas_phy_release;
788 }
789 EXPORT_SYMBOL(scsi_is_sas_phy);
790 
791 /*
792  * SAS Port attributes
793  */
794 #define sas_port_show_simple(field, name, format_string, cast)		\
795 static ssize_t								\
796 show_sas_port_##name(struct device *dev, 				\
797 		     struct device_attribute *attr, char *buf)		\
798 {									\
799 	struct sas_port *port = transport_class_to_sas_port(dev);	\
800 									\
801 	return snprintf(buf, 20, format_string, cast port->field);	\
802 }
803 
804 #define sas_port_simple_attr(field, name, format_string, type)		\
805 	sas_port_show_simple(field, name, format_string, (type))	\
806 static DEVICE_ATTR(name, S_IRUGO, show_sas_port_##name, NULL)
807 
808 sas_port_simple_attr(num_phys, num_phys, "%d\n", int);
809 
810 static DECLARE_TRANSPORT_CLASS(sas_port_class,
811 			       "sas_port", NULL, NULL, NULL);
812 
813 static int sas_port_match(struct attribute_container *cont, struct device *dev)
814 {
815 	struct Scsi_Host *shost;
816 	struct sas_internal *i;
817 
818 	if (!scsi_is_sas_port(dev))
819 		return 0;
820 	shost = dev_to_shost(dev->parent);
821 
822 	if (!shost->transportt)
823 		return 0;
824 	if (shost->transportt->host_attrs.ac.class !=
825 			&sas_host_class.class)
826 		return 0;
827 
828 	i = to_sas_internal(shost->transportt);
829 	return &i->port_attr_cont.ac == cont;
830 }
831 
832 
833 static void sas_port_release(struct device *dev)
834 {
835 	struct sas_port *port = dev_to_sas_port(dev);
836 
837 	BUG_ON(!list_empty(&port->phy_list));
838 
839 	put_device(dev->parent);
840 	kfree(port);
841 }
842 
843 static void sas_port_create_link(struct sas_port *port,
844 				 struct sas_phy *phy)
845 {
846 	int res;
847 
848 	res = sysfs_create_link(&port->dev.kobj, &phy->dev.kobj,
849 				dev_name(&phy->dev));
850 	if (res)
851 		goto err;
852 	res = sysfs_create_link(&phy->dev.kobj, &port->dev.kobj, "port");
853 	if (res)
854 		goto err;
855 	return;
856 err:
857 	printk(KERN_ERR "%s: Cannot create port links, err=%d\n",
858 	       __func__, res);
859 }
860 
861 static void sas_port_delete_link(struct sas_port *port,
862 				 struct sas_phy *phy)
863 {
864 	sysfs_remove_link(&port->dev.kobj, dev_name(&phy->dev));
865 	sysfs_remove_link(&phy->dev.kobj, "port");
866 }
867 
868 /** sas_port_alloc - allocate and initialize a SAS port structure
869  *
870  * @parent:	parent device
871  * @port_id:	port number
872  *
873  * Allocates a SAS port structure.  It will be added to the device tree
874  * below the device specified by @parent which must be either a Scsi_Host
875  * or a sas_expander_device.
876  *
877  * Returns %NULL on error
878  */
879 struct sas_port *sas_port_alloc(struct device *parent, int port_id)
880 {
881 	struct Scsi_Host *shost = dev_to_shost(parent);
882 	struct sas_port *port;
883 
884 	port = kzalloc(sizeof(*port), GFP_KERNEL);
885 	if (!port)
886 		return NULL;
887 
888 	port->port_identifier = port_id;
889 
890 	device_initialize(&port->dev);
891 
892 	port->dev.parent = get_device(parent);
893 	port->dev.release = sas_port_release;
894 
895 	mutex_init(&port->phy_list_mutex);
896 	INIT_LIST_HEAD(&port->phy_list);
897 
898 	if (scsi_is_sas_expander_device(parent)) {
899 		struct sas_rphy *rphy = dev_to_rphy(parent);
900 		dev_set_name(&port->dev, "port-%d:%d:%d", shost->host_no,
901 			     rphy->scsi_target_id, port->port_identifier);
902 	} else
903 		dev_set_name(&port->dev, "port-%d:%d", shost->host_no,
904 			     port->port_identifier);
905 
906 	transport_setup_device(&port->dev);
907 
908 	return port;
909 }
910 EXPORT_SYMBOL(sas_port_alloc);
911 
912 /** sas_port_alloc_num - allocate and initialize a SAS port structure
913  *
914  * @parent:	parent device
915  *
916  * Allocates a SAS port structure and a number to go with it.  This
917  * interface is really for adapters where the port number has no
918  * meansing, so the sas class should manage them.  It will be added to
919  * the device tree below the device specified by @parent which must be
920  * either a Scsi_Host or a sas_expander_device.
921  *
922  * Returns %NULL on error
923  */
924 struct sas_port *sas_port_alloc_num(struct device *parent)
925 {
926 	int index;
927 	struct Scsi_Host *shost = dev_to_shost(parent);
928 	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
929 
930 	/* FIXME: use idr for this eventually */
931 	mutex_lock(&sas_host->lock);
932 	if (scsi_is_sas_expander_device(parent)) {
933 		struct sas_rphy *rphy = dev_to_rphy(parent);
934 		struct sas_expander_device *exp = rphy_to_expander_device(rphy);
935 
936 		index = exp->next_port_id++;
937 	} else
938 		index = sas_host->next_port_id++;
939 	mutex_unlock(&sas_host->lock);
940 	return sas_port_alloc(parent, index);
941 }
942 EXPORT_SYMBOL(sas_port_alloc_num);
943 
944 /**
945  * sas_port_add - add a SAS port to the device hierarchy
946  * @port:	port to be added
947  *
948  * publishes a port to the rest of the system
949  */
950 int sas_port_add(struct sas_port *port)
951 {
952 	int error;
953 
954 	/* No phys should be added until this is made visible */
955 	BUG_ON(!list_empty(&port->phy_list));
956 
957 	error = device_add(&port->dev);
958 
959 	if (error)
960 		return error;
961 
962 	transport_add_device(&port->dev);
963 	transport_configure_device(&port->dev);
964 
965 	return 0;
966 }
967 EXPORT_SYMBOL(sas_port_add);
968 
969 /**
970  * sas_port_free  -  free a SAS PORT
971  * @port:	SAS PORT to free
972  *
973  * Frees the specified SAS PORT.
974  *
975  * Note:
976  *   This function must only be called on a PORT that has not
977  *   successfully been added using sas_port_add().
978  */
979 void sas_port_free(struct sas_port *port)
980 {
981 	transport_destroy_device(&port->dev);
982 	put_device(&port->dev);
983 }
984 EXPORT_SYMBOL(sas_port_free);
985 
986 /**
987  * sas_port_delete  -  remove SAS PORT
988  * @port:	SAS PORT to remove
989  *
990  * Removes the specified SAS PORT.  If the SAS PORT has an
991  * associated phys, unlink them from the port as well.
992  */
993 void sas_port_delete(struct sas_port *port)
994 {
995 	struct device *dev = &port->dev;
996 	struct sas_phy *phy, *tmp_phy;
997 
998 	if (port->rphy) {
999 		sas_rphy_delete(port->rphy);
1000 		port->rphy = NULL;
1001 	}
1002 
1003 	mutex_lock(&port->phy_list_mutex);
1004 	list_for_each_entry_safe(phy, tmp_phy, &port->phy_list,
1005 				 port_siblings) {
1006 		sas_port_delete_link(port, phy);
1007 		list_del_init(&phy->port_siblings);
1008 	}
1009 	mutex_unlock(&port->phy_list_mutex);
1010 
1011 	if (port->is_backlink) {
1012 		struct device *parent = port->dev.parent;
1013 
1014 		sysfs_remove_link(&port->dev.kobj, dev_name(parent));
1015 		port->is_backlink = 0;
1016 	}
1017 
1018 	transport_remove_device(dev);
1019 	device_del(dev);
1020 	transport_destroy_device(dev);
1021 	put_device(dev);
1022 }
1023 EXPORT_SYMBOL(sas_port_delete);
1024 
1025 /**
1026  * scsi_is_sas_port -  check if a struct device represents a SAS port
1027  * @dev:	device to check
1028  *
1029  * Returns:
1030  *	%1 if the device represents a SAS Port, %0 else
1031  */
1032 int scsi_is_sas_port(const struct device *dev)
1033 {
1034 	return dev->release == sas_port_release;
1035 }
1036 EXPORT_SYMBOL(scsi_is_sas_port);
1037 
1038 /**
1039  * sas_port_get_phy - try to take a reference on a port member
1040  * @port: port to check
1041  */
1042 struct sas_phy *sas_port_get_phy(struct sas_port *port)
1043 {
1044 	struct sas_phy *phy;
1045 
1046 	mutex_lock(&port->phy_list_mutex);
1047 	if (list_empty(&port->phy_list))
1048 		phy = NULL;
1049 	else {
1050 		struct list_head *ent = port->phy_list.next;
1051 
1052 		phy = list_entry(ent, typeof(*phy), port_siblings);
1053 		get_device(&phy->dev);
1054 	}
1055 	mutex_unlock(&port->phy_list_mutex);
1056 
1057 	return phy;
1058 }
1059 EXPORT_SYMBOL(sas_port_get_phy);
1060 
1061 /**
1062  * sas_port_add_phy - add another phy to a port to form a wide port
1063  * @port:	port to add the phy to
1064  * @phy:	phy to add
1065  *
1066  * When a port is initially created, it is empty (has no phys).  All
1067  * ports must have at least one phy to operated, and all wide ports
1068  * must have at least two.  The current code makes no difference
1069  * between ports and wide ports, but the only object that can be
1070  * connected to a remote device is a port, so ports must be formed on
1071  * all devices with phys if they're connected to anything.
1072  */
1073 void sas_port_add_phy(struct sas_port *port, struct sas_phy *phy)
1074 {
1075 	mutex_lock(&port->phy_list_mutex);
1076 	if (unlikely(!list_empty(&phy->port_siblings))) {
1077 		/* make sure we're already on this port */
1078 		struct sas_phy *tmp;
1079 
1080 		list_for_each_entry(tmp, &port->phy_list, port_siblings)
1081 			if (tmp == phy)
1082 				break;
1083 		/* If this trips, you added a phy that was already
1084 		 * part of a different port */
1085 		if (unlikely(tmp != phy)) {
1086 			dev_printk(KERN_ERR, &port->dev, "trying to add phy %s fails: it's already part of another port\n",
1087 				   dev_name(&phy->dev));
1088 			BUG();
1089 		}
1090 	} else {
1091 		sas_port_create_link(port, phy);
1092 		list_add_tail(&phy->port_siblings, &port->phy_list);
1093 		port->num_phys++;
1094 	}
1095 	mutex_unlock(&port->phy_list_mutex);
1096 }
1097 EXPORT_SYMBOL(sas_port_add_phy);
1098 
1099 /**
1100  * sas_port_delete_phy - remove a phy from a port or wide port
1101  * @port:	port to remove the phy from
1102  * @phy:	phy to remove
1103  *
1104  * This operation is used for tearing down ports again.  It must be
1105  * done to every port or wide port before calling sas_port_delete.
1106  */
1107 void sas_port_delete_phy(struct sas_port *port, struct sas_phy *phy)
1108 {
1109 	mutex_lock(&port->phy_list_mutex);
1110 	sas_port_delete_link(port, phy);
1111 	list_del_init(&phy->port_siblings);
1112 	port->num_phys--;
1113 	mutex_unlock(&port->phy_list_mutex);
1114 }
1115 EXPORT_SYMBOL(sas_port_delete_phy);
1116 
1117 void sas_port_mark_backlink(struct sas_port *port)
1118 {
1119 	int res;
1120 	struct device *parent = port->dev.parent->parent->parent;
1121 
1122 	if (port->is_backlink)
1123 		return;
1124 	port->is_backlink = 1;
1125 	res = sysfs_create_link(&port->dev.kobj, &parent->kobj,
1126 				dev_name(parent));
1127 	if (res)
1128 		goto err;
1129 	return;
1130 err:
1131 	printk(KERN_ERR "%s: Cannot create port backlink, err=%d\n",
1132 	       __func__, res);
1133 
1134 }
1135 EXPORT_SYMBOL(sas_port_mark_backlink);
1136 
1137 /*
1138  * SAS remote PHY attributes.
1139  */
1140 
1141 #define sas_rphy_show_simple(field, name, format_string, cast)		\
1142 static ssize_t								\
1143 show_sas_rphy_##name(struct device *dev, 				\
1144 		     struct device_attribute *attr, char *buf)		\
1145 {									\
1146 	struct sas_rphy *rphy = transport_class_to_rphy(dev);		\
1147 									\
1148 	return snprintf(buf, 20, format_string, cast rphy->field);	\
1149 }
1150 
1151 #define sas_rphy_simple_attr(field, name, format_string, type)		\
1152 	sas_rphy_show_simple(field, name, format_string, (type))	\
1153 static SAS_DEVICE_ATTR(rphy, name, S_IRUGO, 			\
1154 		show_sas_rphy_##name, NULL)
1155 
1156 #define sas_rphy_show_protocol(field, name)				\
1157 static ssize_t								\
1158 show_sas_rphy_##name(struct device *dev, 				\
1159 		     struct device_attribute *attr, char *buf)		\
1160 {									\
1161 	struct sas_rphy *rphy = transport_class_to_rphy(dev);		\
1162 									\
1163 	if (!rphy->field)					\
1164 		return snprintf(buf, 20, "none\n");			\
1165 	return get_sas_protocol_names(rphy->field, buf);	\
1166 }
1167 
1168 #define sas_rphy_protocol_attr(field, name)				\
1169 	sas_rphy_show_protocol(field, name)				\
1170 static SAS_DEVICE_ATTR(rphy, name, S_IRUGO,			\
1171 		show_sas_rphy_##name, NULL)
1172 
1173 static ssize_t
1174 show_sas_rphy_device_type(struct device *dev,
1175 			  struct device_attribute *attr, char *buf)
1176 {
1177 	struct sas_rphy *rphy = transport_class_to_rphy(dev);
1178 
1179 	if (!rphy->identify.device_type)
1180 		return snprintf(buf, 20, "none\n");
1181 	return get_sas_device_type_names(
1182 			rphy->identify.device_type, buf);
1183 }
1184 
1185 static SAS_DEVICE_ATTR(rphy, device_type, S_IRUGO,
1186 		show_sas_rphy_device_type, NULL);
1187 
1188 static ssize_t
1189 show_sas_rphy_enclosure_identifier(struct device *dev,
1190 				   struct device_attribute *attr, char *buf)
1191 {
1192 	struct sas_rphy *rphy = transport_class_to_rphy(dev);
1193 	struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
1194 	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
1195 	struct sas_internal *i = to_sas_internal(shost->transportt);
1196 	u64 identifier;
1197 	int error;
1198 
1199 	error = i->f->get_enclosure_identifier(rphy, &identifier);
1200 	if (error)
1201 		return error;
1202 	return sprintf(buf, "0x%llx\n", (unsigned long long)identifier);
1203 }
1204 
1205 static SAS_DEVICE_ATTR(rphy, enclosure_identifier, S_IRUGO,
1206 		show_sas_rphy_enclosure_identifier, NULL);
1207 
1208 static ssize_t
1209 show_sas_rphy_bay_identifier(struct device *dev,
1210 			     struct device_attribute *attr, char *buf)
1211 {
1212 	struct sas_rphy *rphy = transport_class_to_rphy(dev);
1213 	struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
1214 	struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
1215 	struct sas_internal *i = to_sas_internal(shost->transportt);
1216 	int val;
1217 
1218 	val = i->f->get_bay_identifier(rphy);
1219 	if (val < 0)
1220 		return val;
1221 	return sprintf(buf, "%d\n", val);
1222 }
1223 
1224 static SAS_DEVICE_ATTR(rphy, bay_identifier, S_IRUGO,
1225 		show_sas_rphy_bay_identifier, NULL);
1226 
1227 sas_rphy_protocol_attr(identify.initiator_port_protocols,
1228 		initiator_port_protocols);
1229 sas_rphy_protocol_attr(identify.target_port_protocols, target_port_protocols);
1230 sas_rphy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
1231 		unsigned long long);
1232 sas_rphy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
1233 sas_rphy_simple_attr(scsi_target_id, scsi_target_id, "%d\n", u32);
1234 
1235 /* only need 8 bytes of data plus header (4 or 8) */
1236 #define BUF_SIZE 64
1237 
1238 int sas_read_port_mode_page(struct scsi_device *sdev)
1239 {
1240 	char *buffer = kzalloc(BUF_SIZE, GFP_KERNEL), *msdata;
1241 	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
1242 	struct scsi_mode_data mode_data;
1243 	int error;
1244 
1245 	if (!buffer)
1246 		return -ENOMEM;
1247 
1248 	error = scsi_mode_sense(sdev, 1, 0x19, buffer, BUF_SIZE, 30*HZ, 3,
1249 				&mode_data, NULL);
1250 
1251 	if (error)
1252 		goto out;
1253 
1254 	msdata = buffer +  mode_data.header_length +
1255 		mode_data.block_descriptor_length;
1256 
1257 	if (msdata - buffer > BUF_SIZE - 8)
1258 		goto out;
1259 
1260 	error = 0;
1261 
1262 	rdev->ready_led_meaning = msdata[2] & 0x10 ? 1 : 0;
1263 	rdev->I_T_nexus_loss_timeout = (msdata[4] << 8) + msdata[5];
1264 	rdev->initiator_response_timeout = (msdata[6] << 8) + msdata[7];
1265 
1266  out:
1267 	kfree(buffer);
1268 	return error;
1269 }
1270 EXPORT_SYMBOL(sas_read_port_mode_page);
1271 
1272 static DECLARE_TRANSPORT_CLASS(sas_end_dev_class,
1273 			       "sas_end_device", NULL, NULL, NULL);
1274 
1275 #define sas_end_dev_show_simple(field, name, format_string, cast)	\
1276 static ssize_t								\
1277 show_sas_end_dev_##name(struct device *dev, 				\
1278 			struct device_attribute *attr, char *buf)	\
1279 {									\
1280 	struct sas_rphy *rphy = transport_class_to_rphy(dev);		\
1281 	struct sas_end_device *rdev = rphy_to_end_device(rphy);		\
1282 									\
1283 	return snprintf(buf, 20, format_string, cast rdev->field);	\
1284 }
1285 
1286 #define sas_end_dev_simple_attr(field, name, format_string, type)	\
1287 	sas_end_dev_show_simple(field, name, format_string, (type))	\
1288 static SAS_DEVICE_ATTR(end_dev, name, S_IRUGO, 			\
1289 		show_sas_end_dev_##name, NULL)
1290 
1291 sas_end_dev_simple_attr(ready_led_meaning, ready_led_meaning, "%d\n", int);
1292 sas_end_dev_simple_attr(I_T_nexus_loss_timeout, I_T_nexus_loss_timeout,
1293 			"%d\n", int);
1294 sas_end_dev_simple_attr(initiator_response_timeout, initiator_response_timeout,
1295 			"%d\n", int);
1296 sas_end_dev_simple_attr(tlr_supported, tlr_supported,
1297 			"%d\n", int);
1298 sas_end_dev_simple_attr(tlr_enabled, tlr_enabled,
1299 			"%d\n", int);
1300 
1301 static DECLARE_TRANSPORT_CLASS(sas_expander_class,
1302 			       "sas_expander", NULL, NULL, NULL);
1303 
1304 #define sas_expander_show_simple(field, name, format_string, cast)	\
1305 static ssize_t								\
1306 show_sas_expander_##name(struct device *dev, 				\
1307 			 struct device_attribute *attr, char *buf)	\
1308 {									\
1309 	struct sas_rphy *rphy = transport_class_to_rphy(dev);		\
1310 	struct sas_expander_device *edev = rphy_to_expander_device(rphy); \
1311 									\
1312 	return snprintf(buf, 20, format_string, cast edev->field);	\
1313 }
1314 
1315 #define sas_expander_simple_attr(field, name, format_string, type)	\
1316 	sas_expander_show_simple(field, name, format_string, (type))	\
1317 static SAS_DEVICE_ATTR(expander, name, S_IRUGO, 			\
1318 		show_sas_expander_##name, NULL)
1319 
1320 sas_expander_simple_attr(vendor_id, vendor_id, "%s\n", char *);
1321 sas_expander_simple_attr(product_id, product_id, "%s\n", char *);
1322 sas_expander_simple_attr(product_rev, product_rev, "%s\n", char *);
1323 sas_expander_simple_attr(component_vendor_id, component_vendor_id,
1324 			 "%s\n", char *);
1325 sas_expander_simple_attr(component_id, component_id, "%u\n", unsigned int);
1326 sas_expander_simple_attr(component_revision_id, component_revision_id, "%u\n",
1327 			 unsigned int);
1328 sas_expander_simple_attr(level, level, "%d\n", int);
1329 
1330 static DECLARE_TRANSPORT_CLASS(sas_rphy_class,
1331 		"sas_device", NULL, NULL, NULL);
1332 
1333 static int sas_rphy_match(struct attribute_container *cont, struct device *dev)
1334 {
1335 	struct Scsi_Host *shost;
1336 	struct sas_internal *i;
1337 
1338 	if (!scsi_is_sas_rphy(dev))
1339 		return 0;
1340 	shost = dev_to_shost(dev->parent->parent);
1341 
1342 	if (!shost->transportt)
1343 		return 0;
1344 	if (shost->transportt->host_attrs.ac.class !=
1345 			&sas_host_class.class)
1346 		return 0;
1347 
1348 	i = to_sas_internal(shost->transportt);
1349 	return &i->rphy_attr_cont.ac == cont;
1350 }
1351 
1352 static int sas_end_dev_match(struct attribute_container *cont,
1353 			     struct device *dev)
1354 {
1355 	struct Scsi_Host *shost;
1356 	struct sas_internal *i;
1357 	struct sas_rphy *rphy;
1358 
1359 	if (!scsi_is_sas_rphy(dev))
1360 		return 0;
1361 	shost = dev_to_shost(dev->parent->parent);
1362 	rphy = dev_to_rphy(dev);
1363 
1364 	if (!shost->transportt)
1365 		return 0;
1366 	if (shost->transportt->host_attrs.ac.class !=
1367 			&sas_host_class.class)
1368 		return 0;
1369 
1370 	i = to_sas_internal(shost->transportt);
1371 	return &i->end_dev_attr_cont.ac == cont &&
1372 		rphy->identify.device_type == SAS_END_DEVICE;
1373 }
1374 
1375 static int sas_expander_match(struct attribute_container *cont,
1376 			      struct device *dev)
1377 {
1378 	struct Scsi_Host *shost;
1379 	struct sas_internal *i;
1380 	struct sas_rphy *rphy;
1381 
1382 	if (!scsi_is_sas_rphy(dev))
1383 		return 0;
1384 	shost = dev_to_shost(dev->parent->parent);
1385 	rphy = dev_to_rphy(dev);
1386 
1387 	if (!shost->transportt)
1388 		return 0;
1389 	if (shost->transportt->host_attrs.ac.class !=
1390 			&sas_host_class.class)
1391 		return 0;
1392 
1393 	i = to_sas_internal(shost->transportt);
1394 	return &i->expander_attr_cont.ac == cont &&
1395 		(rphy->identify.device_type == SAS_EDGE_EXPANDER_DEVICE ||
1396 		 rphy->identify.device_type == SAS_FANOUT_EXPANDER_DEVICE);
1397 }
1398 
1399 static void sas_expander_release(struct device *dev)
1400 {
1401 	struct sas_rphy *rphy = dev_to_rphy(dev);
1402 	struct sas_expander_device *edev = rphy_to_expander_device(rphy);
1403 
1404 	put_device(dev->parent);
1405 	kfree(edev);
1406 }
1407 
1408 static void sas_end_device_release(struct device *dev)
1409 {
1410 	struct sas_rphy *rphy = dev_to_rphy(dev);
1411 	struct sas_end_device *edev = rphy_to_end_device(rphy);
1412 
1413 	put_device(dev->parent);
1414 	kfree(edev);
1415 }
1416 
1417 /**
1418  * sas_rphy_initialize - common rphy initialization
1419  * @rphy:	rphy to initialise
1420  *
1421  * Used by both sas_end_device_alloc() and sas_expander_alloc() to
1422  * initialise the common rphy component of each.
1423  */
1424 static void sas_rphy_initialize(struct sas_rphy *rphy)
1425 {
1426 	INIT_LIST_HEAD(&rphy->list);
1427 }
1428 
1429 /**
1430  * sas_end_device_alloc - allocate an rphy for an end device
1431  * @parent: which port
1432  *
1433  * Allocates an SAS remote PHY structure, connected to @parent.
1434  *
1435  * Returns:
1436  *	SAS PHY allocated or %NULL if the allocation failed.
1437  */
1438 struct sas_rphy *sas_end_device_alloc(struct sas_port *parent)
1439 {
1440 	struct Scsi_Host *shost = dev_to_shost(&parent->dev);
1441 	struct sas_end_device *rdev;
1442 
1443 	rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1444 	if (!rdev) {
1445 		return NULL;
1446 	}
1447 
1448 	device_initialize(&rdev->rphy.dev);
1449 	rdev->rphy.dev.parent = get_device(&parent->dev);
1450 	rdev->rphy.dev.release = sas_end_device_release;
1451 	if (scsi_is_sas_expander_device(parent->dev.parent)) {
1452 		struct sas_rphy *rphy = dev_to_rphy(parent->dev.parent);
1453 		dev_set_name(&rdev->rphy.dev, "end_device-%d:%d:%d",
1454 			     shost->host_no, rphy->scsi_target_id,
1455 			     parent->port_identifier);
1456 	} else
1457 		dev_set_name(&rdev->rphy.dev, "end_device-%d:%d",
1458 			     shost->host_no, parent->port_identifier);
1459 	rdev->rphy.identify.device_type = SAS_END_DEVICE;
1460 	sas_rphy_initialize(&rdev->rphy);
1461 	transport_setup_device(&rdev->rphy.dev);
1462 
1463 	return &rdev->rphy;
1464 }
1465 EXPORT_SYMBOL(sas_end_device_alloc);
1466 
1467 /**
1468  * sas_expander_alloc - allocate an rphy for an end device
1469  * @parent: which port
1470  * @type: SAS_EDGE_EXPANDER_DEVICE or SAS_FANOUT_EXPANDER_DEVICE
1471  *
1472  * Allocates an SAS remote PHY structure, connected to @parent.
1473  *
1474  * Returns:
1475  *	SAS PHY allocated or %NULL if the allocation failed.
1476  */
1477 struct sas_rphy *sas_expander_alloc(struct sas_port *parent,
1478 				    enum sas_device_type type)
1479 {
1480 	struct Scsi_Host *shost = dev_to_shost(&parent->dev);
1481 	struct sas_expander_device *rdev;
1482 	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1483 
1484 	BUG_ON(type != SAS_EDGE_EXPANDER_DEVICE &&
1485 	       type != SAS_FANOUT_EXPANDER_DEVICE);
1486 
1487 	rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1488 	if (!rdev) {
1489 		return NULL;
1490 	}
1491 
1492 	device_initialize(&rdev->rphy.dev);
1493 	rdev->rphy.dev.parent = get_device(&parent->dev);
1494 	rdev->rphy.dev.release = sas_expander_release;
1495 	mutex_lock(&sas_host->lock);
1496 	rdev->rphy.scsi_target_id = sas_host->next_expander_id++;
1497 	mutex_unlock(&sas_host->lock);
1498 	dev_set_name(&rdev->rphy.dev, "expander-%d:%d",
1499 		     shost->host_no, rdev->rphy.scsi_target_id);
1500 	rdev->rphy.identify.device_type = type;
1501 	sas_rphy_initialize(&rdev->rphy);
1502 	transport_setup_device(&rdev->rphy.dev);
1503 
1504 	return &rdev->rphy;
1505 }
1506 EXPORT_SYMBOL(sas_expander_alloc);
1507 
1508 /**
1509  * sas_rphy_add  -  add a SAS remote PHY to the device hierarchy
1510  * @rphy:	The remote PHY to be added
1511  *
1512  * Publishes a SAS remote PHY to the rest of the system.
1513  */
1514 int sas_rphy_add(struct sas_rphy *rphy)
1515 {
1516 	struct sas_port *parent = dev_to_sas_port(rphy->dev.parent);
1517 	struct Scsi_Host *shost = dev_to_shost(parent->dev.parent);
1518 	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1519 	struct sas_identify *identify = &rphy->identify;
1520 	int error;
1521 
1522 	if (parent->rphy)
1523 		return -ENXIO;
1524 	parent->rphy = rphy;
1525 
1526 	error = device_add(&rphy->dev);
1527 	if (error)
1528 		return error;
1529 	transport_add_device(&rphy->dev);
1530 	transport_configure_device(&rphy->dev);
1531 	if (sas_bsg_initialize(shost, rphy))
1532 		printk("fail to a bsg device %s\n", dev_name(&rphy->dev));
1533 
1534 
1535 	mutex_lock(&sas_host->lock);
1536 	list_add_tail(&rphy->list, &sas_host->rphy_list);
1537 	if (identify->device_type == SAS_END_DEVICE &&
1538 	    (identify->target_port_protocols &
1539 	     (SAS_PROTOCOL_SSP | SAS_PROTOCOL_STP | SAS_PROTOCOL_SATA)))
1540 		rphy->scsi_target_id = sas_host->next_target_id++;
1541 	else if (identify->device_type == SAS_END_DEVICE)
1542 		rphy->scsi_target_id = -1;
1543 	mutex_unlock(&sas_host->lock);
1544 
1545 	if (identify->device_type == SAS_END_DEVICE &&
1546 	    rphy->scsi_target_id != -1) {
1547 		int lun;
1548 
1549 		if (identify->target_port_protocols & SAS_PROTOCOL_SSP)
1550 			lun = SCAN_WILD_CARD;
1551 		else
1552 			lun = 0;
1553 
1554 		scsi_scan_target(&rphy->dev, 0, rphy->scsi_target_id, lun,
1555 				 SCSI_SCAN_INITIAL);
1556 	}
1557 
1558 	return 0;
1559 }
1560 EXPORT_SYMBOL(sas_rphy_add);
1561 
1562 /**
1563  * sas_rphy_free  -  free a SAS remote PHY
1564  * @rphy: SAS remote PHY to free
1565  *
1566  * Frees the specified SAS remote PHY.
1567  *
1568  * Note:
1569  *   This function must only be called on a remote
1570  *   PHY that has not successfully been added using
1571  *   sas_rphy_add() (or has been sas_rphy_remove()'d)
1572  */
1573 void sas_rphy_free(struct sas_rphy *rphy)
1574 {
1575 	struct device *dev = &rphy->dev;
1576 	struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent->parent);
1577 	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1578 
1579 	mutex_lock(&sas_host->lock);
1580 	list_del(&rphy->list);
1581 	mutex_unlock(&sas_host->lock);
1582 
1583 	transport_destroy_device(dev);
1584 
1585 	put_device(dev);
1586 }
1587 EXPORT_SYMBOL(sas_rphy_free);
1588 
1589 /**
1590  * sas_rphy_delete  -  remove and free SAS remote PHY
1591  * @rphy:	SAS remote PHY to remove and free
1592  *
1593  * Removes the specified SAS remote PHY and frees it.
1594  */
1595 void
1596 sas_rphy_delete(struct sas_rphy *rphy)
1597 {
1598 	sas_rphy_remove(rphy);
1599 	sas_rphy_free(rphy);
1600 }
1601 EXPORT_SYMBOL(sas_rphy_delete);
1602 
1603 /**
1604  * sas_rphy_unlink  -  unlink SAS remote PHY
1605  * @rphy:	SAS remote phy to unlink from its parent port
1606  *
1607  * Removes port reference to an rphy
1608  */
1609 void sas_rphy_unlink(struct sas_rphy *rphy)
1610 {
1611 	struct sas_port *parent = dev_to_sas_port(rphy->dev.parent);
1612 
1613 	parent->rphy = NULL;
1614 }
1615 EXPORT_SYMBOL(sas_rphy_unlink);
1616 
1617 /**
1618  * sas_rphy_remove  -  remove SAS remote PHY
1619  * @rphy:	SAS remote phy to remove
1620  *
1621  * Removes the specified SAS remote PHY.
1622  */
1623 void
1624 sas_rphy_remove(struct sas_rphy *rphy)
1625 {
1626 	struct device *dev = &rphy->dev;
1627 
1628 	switch (rphy->identify.device_type) {
1629 	case SAS_END_DEVICE:
1630 		scsi_remove_target(dev);
1631 		break;
1632 	case SAS_EDGE_EXPANDER_DEVICE:
1633 	case SAS_FANOUT_EXPANDER_DEVICE:
1634 		sas_remove_children(dev);
1635 		break;
1636 	default:
1637 		break;
1638 	}
1639 
1640 	sas_rphy_unlink(rphy);
1641 	bsg_remove_queue(rphy->q);
1642 	transport_remove_device(dev);
1643 	device_del(dev);
1644 }
1645 EXPORT_SYMBOL(sas_rphy_remove);
1646 
1647 /**
1648  * scsi_is_sas_rphy  -  check if a struct device represents a SAS remote PHY
1649  * @dev:	device to check
1650  *
1651  * Returns:
1652  *	%1 if the device represents a SAS remote PHY, %0 else
1653  */
1654 int scsi_is_sas_rphy(const struct device *dev)
1655 {
1656 	return dev->release == sas_end_device_release ||
1657 		dev->release == sas_expander_release;
1658 }
1659 EXPORT_SYMBOL(scsi_is_sas_rphy);
1660 
1661 
1662 /*
1663  * SCSI scan helper
1664  */
1665 
1666 static int sas_user_scan(struct Scsi_Host *shost, uint channel,
1667 		uint id, u64 lun)
1668 {
1669 	struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1670 	struct sas_rphy *rphy;
1671 
1672 	mutex_lock(&sas_host->lock);
1673 	list_for_each_entry(rphy, &sas_host->rphy_list, list) {
1674 		if (rphy->identify.device_type != SAS_END_DEVICE ||
1675 		    rphy->scsi_target_id == -1)
1676 			continue;
1677 
1678 		if ((channel == SCAN_WILD_CARD || channel == 0) &&
1679 		    (id == SCAN_WILD_CARD || id == rphy->scsi_target_id)) {
1680 			scsi_scan_target(&rphy->dev, 0, rphy->scsi_target_id,
1681 					 lun, SCSI_SCAN_MANUAL);
1682 		}
1683 	}
1684 	mutex_unlock(&sas_host->lock);
1685 
1686 	return 0;
1687 }
1688 
1689 
1690 /*
1691  * Setup / Teardown code
1692  */
1693 
1694 #define SETUP_TEMPLATE(attrb, field, perm, test)			\
1695 	i->private_##attrb[count] = dev_attr_##field;		\
1696 	i->private_##attrb[count].attr.mode = perm;			\
1697 	i->attrb[count] = &i->private_##attrb[count];			\
1698 	if (test)							\
1699 		count++
1700 
1701 #define SETUP_TEMPLATE_RW(attrb, field, perm, test, ro_test, ro_perm)	\
1702 	i->private_##attrb[count] = dev_attr_##field;		\
1703 	i->private_##attrb[count].attr.mode = perm;			\
1704 	if (ro_test) {							\
1705 		i->private_##attrb[count].attr.mode = ro_perm;		\
1706 		i->private_##attrb[count].store = NULL;			\
1707 	}								\
1708 	i->attrb[count] = &i->private_##attrb[count];			\
1709 	if (test)							\
1710 		count++
1711 
1712 #define SETUP_RPORT_ATTRIBUTE(field) 					\
1713 	SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, 1)
1714 
1715 #define SETUP_OPTIONAL_RPORT_ATTRIBUTE(field, func)			\
1716 	SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, i->f->func)
1717 
1718 #define SETUP_PHY_ATTRIBUTE(field)					\
1719 	SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, 1)
1720 
1721 #define SETUP_PHY_ATTRIBUTE_RW(field)					\
1722 	SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1,	\
1723 			!i->f->set_phy_speed, S_IRUGO)
1724 
1725 #define SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(field, func)			\
1726 	SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1,	\
1727 			  !i->f->func, S_IRUGO)
1728 
1729 #define SETUP_PORT_ATTRIBUTE(field)					\
1730 	SETUP_TEMPLATE(port_attrs, field, S_IRUGO, 1)
1731 
1732 #define SETUP_OPTIONAL_PHY_ATTRIBUTE(field, func)			\
1733 	SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, i->f->func)
1734 
1735 #define SETUP_PHY_ATTRIBUTE_WRONLY(field)				\
1736 	SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, 1)
1737 
1738 #define SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(field, func)		\
1739 	SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, i->f->func)
1740 
1741 #define SETUP_END_DEV_ATTRIBUTE(field)					\
1742 	SETUP_TEMPLATE(end_dev_attrs, field, S_IRUGO, 1)
1743 
1744 #define SETUP_EXPANDER_ATTRIBUTE(field)					\
1745 	SETUP_TEMPLATE(expander_attrs, expander_##field, S_IRUGO, 1)
1746 
1747 /**
1748  * sas_attach_transport  -  instantiate SAS transport template
1749  * @ft:		SAS transport class function template
1750  */
1751 struct scsi_transport_template *
1752 sas_attach_transport(struct sas_function_template *ft)
1753 {
1754 	struct sas_internal *i;
1755 	int count;
1756 
1757 	i = kzalloc(sizeof(struct sas_internal), GFP_KERNEL);
1758 	if (!i)
1759 		return NULL;
1760 
1761 	i->t.user_scan = sas_user_scan;
1762 
1763 	i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1764 	i->t.host_attrs.ac.class = &sas_host_class.class;
1765 	i->t.host_attrs.ac.match = sas_host_match;
1766 	transport_container_register(&i->t.host_attrs);
1767 	i->t.host_size = sizeof(struct sas_host_attrs);
1768 
1769 	i->phy_attr_cont.ac.class = &sas_phy_class.class;
1770 	i->phy_attr_cont.ac.attrs = &i->phy_attrs[0];
1771 	i->phy_attr_cont.ac.match = sas_phy_match;
1772 	transport_container_register(&i->phy_attr_cont);
1773 
1774 	i->port_attr_cont.ac.class = &sas_port_class.class;
1775 	i->port_attr_cont.ac.attrs = &i->port_attrs[0];
1776 	i->port_attr_cont.ac.match = sas_port_match;
1777 	transport_container_register(&i->port_attr_cont);
1778 
1779 	i->rphy_attr_cont.ac.class = &sas_rphy_class.class;
1780 	i->rphy_attr_cont.ac.attrs = &i->rphy_attrs[0];
1781 	i->rphy_attr_cont.ac.match = sas_rphy_match;
1782 	transport_container_register(&i->rphy_attr_cont);
1783 
1784 	i->end_dev_attr_cont.ac.class = &sas_end_dev_class.class;
1785 	i->end_dev_attr_cont.ac.attrs = &i->end_dev_attrs[0];
1786 	i->end_dev_attr_cont.ac.match = sas_end_dev_match;
1787 	transport_container_register(&i->end_dev_attr_cont);
1788 
1789 	i->expander_attr_cont.ac.class = &sas_expander_class.class;
1790 	i->expander_attr_cont.ac.attrs = &i->expander_attrs[0];
1791 	i->expander_attr_cont.ac.match = sas_expander_match;
1792 	transport_container_register(&i->expander_attr_cont);
1793 
1794 	i->f = ft;
1795 
1796 	count = 0;
1797 	SETUP_PHY_ATTRIBUTE(initiator_port_protocols);
1798 	SETUP_PHY_ATTRIBUTE(target_port_protocols);
1799 	SETUP_PHY_ATTRIBUTE(device_type);
1800 	SETUP_PHY_ATTRIBUTE(sas_address);
1801 	SETUP_PHY_ATTRIBUTE(phy_identifier);
1802 	SETUP_PHY_ATTRIBUTE(negotiated_linkrate);
1803 	SETUP_PHY_ATTRIBUTE(minimum_linkrate_hw);
1804 	SETUP_PHY_ATTRIBUTE_RW(minimum_linkrate);
1805 	SETUP_PHY_ATTRIBUTE(maximum_linkrate_hw);
1806 	SETUP_PHY_ATTRIBUTE_RW(maximum_linkrate);
1807 
1808 	SETUP_PHY_ATTRIBUTE(invalid_dword_count);
1809 	SETUP_PHY_ATTRIBUTE(running_disparity_error_count);
1810 	SETUP_PHY_ATTRIBUTE(loss_of_dword_sync_count);
1811 	SETUP_PHY_ATTRIBUTE(phy_reset_problem_count);
1812 	SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(link_reset, phy_reset);
1813 	SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(hard_reset, phy_reset);
1814 	SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(enable, phy_enable);
1815 	i->phy_attrs[count] = NULL;
1816 
1817 	count = 0;
1818 	SETUP_PORT_ATTRIBUTE(num_phys);
1819 	i->port_attrs[count] = NULL;
1820 
1821 	count = 0;
1822 	SETUP_RPORT_ATTRIBUTE(rphy_initiator_port_protocols);
1823 	SETUP_RPORT_ATTRIBUTE(rphy_target_port_protocols);
1824 	SETUP_RPORT_ATTRIBUTE(rphy_device_type);
1825 	SETUP_RPORT_ATTRIBUTE(rphy_sas_address);
1826 	SETUP_RPORT_ATTRIBUTE(rphy_phy_identifier);
1827 	SETUP_RPORT_ATTRIBUTE(rphy_scsi_target_id);
1828 	SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_enclosure_identifier,
1829 				       get_enclosure_identifier);
1830 	SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_bay_identifier,
1831 				       get_bay_identifier);
1832 	i->rphy_attrs[count] = NULL;
1833 
1834 	count = 0;
1835 	SETUP_END_DEV_ATTRIBUTE(end_dev_ready_led_meaning);
1836 	SETUP_END_DEV_ATTRIBUTE(end_dev_I_T_nexus_loss_timeout);
1837 	SETUP_END_DEV_ATTRIBUTE(end_dev_initiator_response_timeout);
1838 	SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_supported);
1839 	SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_enabled);
1840 	i->end_dev_attrs[count] = NULL;
1841 
1842 	count = 0;
1843 	SETUP_EXPANDER_ATTRIBUTE(vendor_id);
1844 	SETUP_EXPANDER_ATTRIBUTE(product_id);
1845 	SETUP_EXPANDER_ATTRIBUTE(product_rev);
1846 	SETUP_EXPANDER_ATTRIBUTE(component_vendor_id);
1847 	SETUP_EXPANDER_ATTRIBUTE(component_id);
1848 	SETUP_EXPANDER_ATTRIBUTE(component_revision_id);
1849 	SETUP_EXPANDER_ATTRIBUTE(level);
1850 	i->expander_attrs[count] = NULL;
1851 
1852 	return &i->t;
1853 }
1854 EXPORT_SYMBOL(sas_attach_transport);
1855 
1856 /**
1857  * sas_release_transport  -  release SAS transport template instance
1858  * @t:		transport template instance
1859  */
1860 void sas_release_transport(struct scsi_transport_template *t)
1861 {
1862 	struct sas_internal *i = to_sas_internal(t);
1863 
1864 	transport_container_unregister(&i->t.host_attrs);
1865 	transport_container_unregister(&i->phy_attr_cont);
1866 	transport_container_unregister(&i->port_attr_cont);
1867 	transport_container_unregister(&i->rphy_attr_cont);
1868 	transport_container_unregister(&i->end_dev_attr_cont);
1869 	transport_container_unregister(&i->expander_attr_cont);
1870 
1871 	kfree(i);
1872 }
1873 EXPORT_SYMBOL(sas_release_transport);
1874 
1875 static __init int sas_transport_init(void)
1876 {
1877 	int error;
1878 
1879 	error = transport_class_register(&sas_host_class);
1880 	if (error)
1881 		goto out;
1882 	error = transport_class_register(&sas_phy_class);
1883 	if (error)
1884 		goto out_unregister_transport;
1885 	error = transport_class_register(&sas_port_class);
1886 	if (error)
1887 		goto out_unregister_phy;
1888 	error = transport_class_register(&sas_rphy_class);
1889 	if (error)
1890 		goto out_unregister_port;
1891 	error = transport_class_register(&sas_end_dev_class);
1892 	if (error)
1893 		goto out_unregister_rphy;
1894 	error = transport_class_register(&sas_expander_class);
1895 	if (error)
1896 		goto out_unregister_end_dev;
1897 
1898 	return 0;
1899 
1900  out_unregister_end_dev:
1901 	transport_class_unregister(&sas_end_dev_class);
1902  out_unregister_rphy:
1903 	transport_class_unregister(&sas_rphy_class);
1904  out_unregister_port:
1905 	transport_class_unregister(&sas_port_class);
1906  out_unregister_phy:
1907 	transport_class_unregister(&sas_phy_class);
1908  out_unregister_transport:
1909 	transport_class_unregister(&sas_host_class);
1910  out:
1911 	return error;
1912 
1913 }
1914 
1915 static void __exit sas_transport_exit(void)
1916 {
1917 	transport_class_unregister(&sas_host_class);
1918 	transport_class_unregister(&sas_phy_class);
1919 	transport_class_unregister(&sas_port_class);
1920 	transport_class_unregister(&sas_rphy_class);
1921 	transport_class_unregister(&sas_end_dev_class);
1922 	transport_class_unregister(&sas_expander_class);
1923 }
1924 
1925 MODULE_AUTHOR("Christoph Hellwig");
1926 MODULE_DESCRIPTION("SAS Transport Attributes");
1927 MODULE_LICENSE("GPL");
1928 
1929 module_init(sas_transport_init);
1930 module_exit(sas_transport_exit);
1931