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