projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'for-linus' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / scsi / scsi_transport_sas.c
1 /*
2 * Copyright (C) 2005-2006 Dell Inc.
3 * Released under GPL v2.
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_device.h>
37 #include <scsi/scsi_host.h>
38 #include <scsi/scsi_transport.h>
39 #include <scsi/scsi_transport_sas.h>
40
41 #include "scsi_sas_internal.h"
42 struct sas_host_attrs {
43 struct list_head rphy_list;
44 struct mutex lock;
45 struct request_queue *q;
46 u32 next_target_id;
47 u32 next_expander_id;
48 int next_port_id;
49 };
50 #define to_sas_host_attrs(host) ((struct sas_host_attrs *)(host)->shost_data)
51
52
53 /*
54 * Hack to allow attributes of the same name in different objects.
55 */
56 #define SAS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
57 struct device_attribute dev_attr_##_prefix##_##_name = \
58 __ATTR(_name,_mode,_show,_store)
59
60
61 /*
62 * Pretty printing helpers
63 */
64
65 #define sas_bitfield_name_match(title, table) \
66 static ssize_t \
67 get_sas_##title##_names(u32 table_key, char *buf) \
68 { \
69 char *prefix = ""; \
70 ssize_t len = 0; \
71 int i; \
72 \
73 for (i = 0; i < ARRAY_SIZE(table); i++) { \
74 if (table[i].value & table_key) { \
75 len += sprintf(buf + len, "%s%s", \
76 prefix, table[i].name); \
77 prefix = ", "; \
78 } \
79 } \
80 len += sprintf(buf + len, "\n"); \
81 return len; \
82 }
83
84 #define sas_bitfield_name_set(title, table) \
85 static ssize_t \
86 set_sas_##title##_names(u32 *table_key, const char *buf) \
87 { \
88 ssize_t len = 0; \
89 int i; \
90 \
91 for (i = 0; i < ARRAY_SIZE(table); i++) { \
92 len = strlen(table[i].name); \
93 if (strncmp(buf, table[i].name, len) == 0 && \
94 (buf[len] == '\n' || buf[len] == '\0')) { \
95 *table_key = table[i].value; \
96 return 0; \
97 } \
98 } \
99 return -EINVAL; \
100 }
101
102 #define sas_bitfield_name_search(title, table) \
103 static ssize_t \
104 get_sas_##title##_names(u32 table_key, char *buf) \
105 { \
106 ssize_t len = 0; \
107 int i; \
108 \
109 for (i = 0; i < ARRAY_SIZE(table); i++) { \
110 if (table[i].value == table_key) { \
111 len += sprintf(buf + len, "%s", \
112 table[i].name); \
113 break; \
114 } \
115 } \
116 len += sprintf(buf + len, "\n"); \
117 return len; \
118 }
119
120 static struct {
121 u32 value;
122 char *name;
123 } sas_device_type_names[] = {
124 { SAS_PHY_UNUSED, "unused" },
125 { SAS_END_DEVICE, "end device" },
126 { SAS_EDGE_EXPANDER_DEVICE, "edge expander" },
127 { SAS_FANOUT_EXPANDER_DEVICE, "fanout expander" },
128 };
129 sas_bitfield_name_search(device_type, sas_device_type_names)
130
131
132 static struct {
133 u32 value;
134 char *name;
135 } sas_protocol_names[] = {
136 { SAS_PROTOCOL_SATA, "sata" },
137 { SAS_PROTOCOL_SMP, "smp" },
138 { SAS_PROTOCOL_STP, "stp" },
139 { SAS_PROTOCOL_SSP, "ssp" },
140 };
141 sas_bitfield_name_match(protocol, sas_protocol_names)
142
143 static struct {
144 u32 value;
145 char *name;
146 } sas_linkspeed_names[] = {
147 { SAS_LINK_RATE_UNKNOWN, "Unknown" },
148 { SAS_PHY_DISABLED, "Phy disabled" },
149 { SAS_LINK_RATE_FAILED, "Link Rate failed" },
150 { SAS_SATA_SPINUP_HOLD, "Spin-up hold" },
151 { SAS_LINK_RATE_1_5_GBPS, "1.5 Gbit" },
152 { SAS_LINK_RATE_3_0_GBPS, "3.0 Gbit" },
153 { SAS_LINK_RATE_6_0_GBPS, "6.0 Gbit" },
154 };
155 sas_bitfield_name_search(linkspeed, sas_linkspeed_names)
156 sas_bitfield_name_set(linkspeed, sas_linkspeed_names)
157
158 static struct sas_end_device *sas_sdev_to_rdev(struct scsi_device *sdev)
159 {
160 struct sas_rphy *rphy = target_to_rphy(sdev->sdev_target);
161 struct sas_end_device *rdev;
162
163 BUG_ON(rphy->identify.device_type != SAS_END_DEVICE);
164
165 rdev = rphy_to_end_device(rphy);
166 return rdev;
167 }
168
169 static void sas_smp_request(struct request_queue *q, struct Scsi_Host *shost,
170 struct sas_rphy *rphy)
171 {
172 struct request *req;
173 int ret;
174 int (*handler)(struct Scsi_Host *, struct sas_rphy *, struct request *);
175
176 while ((req = blk_fetch_request(q)) != NULL) {
177 spin_unlock_irq(q->queue_lock);
178
179 handler = to_sas_internal(shost->transportt)->f->smp_handler;
180 ret = handler(shost, rphy, req);
181 req->errors = ret;
182
183 blk_end_request_all(req, ret);
184
185 spin_lock_irq(q->queue_lock);
186 }
187 }
188
189 static void sas_host_smp_request(struct request_queue *q)
190 {
191 sas_smp_request(q, (struct Scsi_Host *)q->queuedata, NULL);
192 }
193
194 static void sas_non_host_smp_request(struct request_queue *q)
195 {
196 struct sas_rphy *rphy = q->queuedata;
197 sas_smp_request(q, rphy_to_shost(rphy), rphy);
198 }
199
200 static void sas_host_release(struct device *dev)
201 {
202 struct Scsi_Host *shost = dev_to_shost(dev);
203 struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
204 struct request_queue *q = sas_host->q;
205
206 if (q)
207 blk_cleanup_queue(q);
208 }
209
210 static int sas_bsg_initialize(struct Scsi_Host *shost, struct sas_rphy *rphy)
211 {
212 struct request_queue *q;
213 int error;
214 struct device *dev;
215 char namebuf[20];
216 const char *name;
217 void (*release)(struct device *);
218
219 if (!to_sas_internal(shost->transportt)->f->smp_handler) {
220 printk("%s can't handle SMP requests\n", shost->hostt->name);
221 return 0;
222 }
223
224 if (rphy) {
225 q = blk_init_queue(sas_non_host_smp_request, NULL);
226 dev = &rphy->dev;
227 name = dev_name(dev);
228 release = NULL;
229 } else {
230 q = blk_init_queue(sas_host_smp_request, NULL);
231 dev = &shost->shost_gendev;
232 snprintf(namebuf, sizeof(namebuf),
233 "sas_host%d", shost->host_no);
234 name = namebuf;
235 release = sas_host_release;
236 }
237 if (!q)
238 return -ENOMEM;
239
240 error = bsg_register_queue(q, dev, name, release);
241 if (error) {
242 blk_cleanup_queue(q);
243 return -ENOMEM;
244 }
245
246 if (rphy)
247 rphy->q = q;
248 else
249 to_sas_host_attrs(shost)->q = q;
250
251 if (rphy)
252 q->queuedata = rphy;
253 else
254 q->queuedata = shost;
255
256 queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
257 return 0;
258 }
259
260 static void sas_bsg_remove(struct Scsi_Host *shost, struct sas_rphy *rphy)
261 {
262 struct request_queue *q;
263
264 if (rphy)
265 q = rphy->q;
266 else
267 q = to_sas_host_attrs(shost)->q;
268
269 if (!q)
270 return;
271
272 bsg_unregister_queue(q);
273 }
274
275 /*
276 * SAS host attributes
277 */
278
279 static int sas_host_setup(struct transport_container *tc, struct device *dev,
280 struct device *cdev)
281 {
282 struct Scsi_Host *shost = dev_to_shost(dev);
283 struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
284
285 INIT_LIST_HEAD(&sas_host->rphy_list);
286 mutex_init(&sas_host->lock);
287 sas_host->next_target_id = 0;
288 sas_host->next_expander_id = 0;
289 sas_host->next_port_id = 0;
290
291 if (sas_bsg_initialize(shost, NULL))
292 dev_printk(KERN_ERR, dev, "fail to a bsg device %d\n",
293 shost->host_no);
294
295 return 0;
296 }
297
298 static int sas_host_remove(struct transport_container *tc, struct device *dev,
299 struct device *cdev)
300 {
301 struct Scsi_Host *shost = dev_to_shost(dev);
302
303 sas_bsg_remove(shost, NULL);
304
305 return 0;
306 }
307
308 static DECLARE_TRANSPORT_CLASS(sas_host_class,
309 "sas_host", sas_host_setup, sas_host_remove, NULL);
310
311 static int sas_host_match(struct attribute_container *cont,
312 struct device *dev)
313 {
314 struct Scsi_Host *shost;
315 struct sas_internal *i;
316
317 if (!scsi_is_host_device(dev))
318 return 0;
319 shost = dev_to_shost(dev);
320
321 if (!shost->transportt)
322 return 0;
323 if (shost->transportt->host_attrs.ac.class !=
324 &sas_host_class.class)
325 return 0;
326
327 i = to_sas_internal(shost->transportt);
328 return &i->t.host_attrs.ac == cont;
329 }
330
331 static int do_sas_phy_delete(struct device *dev, void *data)
332 {
333 int pass = (int)(unsigned long)data;
334
335 if (pass == 0 && scsi_is_sas_port(dev))
336 sas_port_delete(dev_to_sas_port(dev));
337 else if (pass == 1 && scsi_is_sas_phy(dev))
338 sas_phy_delete(dev_to_phy(dev));
339 return 0;
340 }
341
342 /**
343 * sas_remove_children - tear down a devices SAS data structures
344 * @dev: device belonging to the sas object
345 *
346 * Removes all SAS PHYs and remote PHYs for a given object
347 */
348 void sas_remove_children(struct device *dev)
349 {
350 device_for_each_child(dev, (void *)0, do_sas_phy_delete);
351 device_for_each_child(dev, (void *)1, do_sas_phy_delete);
352 }
353 EXPORT_SYMBOL(sas_remove_children);
354
355 /**
356 * sas_remove_host - tear down a Scsi_Host's SAS data structures
357 * @shost: Scsi Host that is torn down
358 *
359 * Removes all SAS PHYs and remote PHYs for a given Scsi_Host.
360 * Must be called just before scsi_remove_host for SAS HBAs.
361 */
362 void sas_remove_host(struct Scsi_Host *shost)
363 {
364 sas_remove_children(&shost->shost_gendev);
365 }
366 EXPORT_SYMBOL(sas_remove_host);
367
368 /**
369 * sas_tlr_supported - checking TLR bit in vpd 0x90
370 * @sdev: scsi device struct
371 *
372 * Check Transport Layer Retries are supported or not.
373 * If vpd page 0x90 is present, TRL is supported.
374 *
375 */
376 unsigned int
377 sas_tlr_supported(struct scsi_device *sdev)
378 {
379 const int vpd_len = 32;
380 struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
381 char *buffer = kzalloc(vpd_len, GFP_KERNEL);
382 int ret = 0;
383
384 if (scsi_get_vpd_page(sdev, 0x90, buffer, vpd_len))
385 goto out;
386
387 /*
388 * Magic numbers: the VPD Protocol page (0x90)
389 * has a 4 byte header and then one entry per device port
390 * the TLR bit is at offset 8 on each port entry
391 * if we take the first port, that's at total offset 12
392 */
393 ret = buffer[12] & 0x01;
394
395 out:
396 kfree(buffer);
397 rdev->tlr_supported = ret;
398 return ret;
399
400 }
401 EXPORT_SYMBOL_GPL(sas_tlr_supported);
402
403 /**
404 * sas_disable_tlr - setting TLR flags
405 * @sdev: scsi device struct
406 *
407 * Seting tlr_enabled flag to 0.
408 *
409 */
410 void
411 sas_disable_tlr(struct scsi_device *sdev)
412 {
413 struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
414
415 rdev->tlr_enabled = 0;
416 }
417 EXPORT_SYMBOL_GPL(sas_disable_tlr);
418
419 /**
420 * sas_enable_tlr - setting TLR flags
421 * @sdev: scsi device struct
422 *
423 * Seting tlr_enabled flag 1.
424 *
425 */
426 void sas_enable_tlr(struct scsi_device *sdev)
427 {
428 unsigned int tlr_supported = 0;
429 tlr_supported = sas_tlr_supported(sdev);
430
431 if (tlr_supported) {
432 struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
433
434 rdev->tlr_enabled = 1;
435 }
436
437 return;
438 }
439 EXPORT_SYMBOL_GPL(sas_enable_tlr);
440
441 unsigned int sas_is_tlr_enabled(struct scsi_device *sdev)
442 {
443 struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
444 return rdev->tlr_enabled;
445 }
446 EXPORT_SYMBOL_GPL(sas_is_tlr_enabled);
447
448 /*
449 * SAS Phy attributes
450 */
451
452 #define sas_phy_show_simple(field, name, format_string, cast) \
453 static ssize_t \
454 show_sas_phy_##name(struct device *dev, \
455 struct device_attribute *attr, char *buf) \
456 { \
457 struct sas_phy *phy = transport_class_to_phy(dev); \
458 \
459 return snprintf(buf, 20, format_string, cast phy->field); \
460 }
461
462 #define sas_phy_simple_attr(field, name, format_string, type) \
463 sas_phy_show_simple(field, name, format_string, (type)) \
464 static DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
465
466 #define sas_phy_show_protocol(field, name) \
467 static ssize_t \
468 show_sas_phy_##name(struct device *dev, \
469 struct device_attribute *attr, char *buf) \
470 { \
471 struct sas_phy *phy = transport_class_to_phy(dev); \
472 \
473 if (!phy->field) \
474 return snprintf(buf, 20, "none\n"); \
475 return get_sas_protocol_names(phy->field, buf); \
476 }
477
478 #define sas_phy_protocol_attr(field, name) \
479 sas_phy_show_protocol(field, name) \
480 static DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
481
482 #define sas_phy_show_linkspeed(field) \
483 static ssize_t \
484 show_sas_phy_##field(struct device *dev, \
485 struct device_attribute *attr, char *buf) \
486 { \
487 struct sas_phy *phy = transport_class_to_phy(dev); \
488 \
489 return get_sas_linkspeed_names(phy->field, buf); \
490 }
491
492 /* Fudge to tell if we're minimum or maximum */
493 #define sas_phy_store_linkspeed(field) \
494 static ssize_t \
495 store_sas_phy_##field(struct device *dev, \
496 struct device_attribute *attr, \
497 const char *buf, size_t count) \
498 { \
499 struct sas_phy *phy = transport_class_to_phy(dev); \
500 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); \
501 struct sas_internal *i = to_sas_internal(shost->transportt); \
502 u32 value; \
503 struct sas_phy_linkrates rates = {0}; \
504 int error; \
505 \
506 error = set_sas_linkspeed_names(&value, buf); \
507 if (error) \
508 return error; \
509 rates.field = value; \
510 error = i->f->set_phy_speed(phy, &rates); \
511 \
512 return error ? error : count; \
513 }
514
515 #define sas_phy_linkspeed_rw_attr(field) \
516 sas_phy_show_linkspeed(field) \
517 sas_phy_store_linkspeed(field) \
518 static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, \
519 store_sas_phy_##field)
520
521 #define sas_phy_linkspeed_attr(field) \
522 sas_phy_show_linkspeed(field) \
523 static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
524
525
526 #define sas_phy_show_linkerror(field) \
527 static ssize_t \
528 show_sas_phy_##field(struct device *dev, \
529 struct device_attribute *attr, char *buf) \
530 { \
531 struct sas_phy *phy = transport_class_to_phy(dev); \
532 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); \
533 struct sas_internal *i = to_sas_internal(shost->transportt); \
534 int error; \
535 \
536 error = i->f->get_linkerrors ? i->f->get_linkerrors(phy) : 0; \
537 if (error) \
538 return error; \
539 return snprintf(buf, 20, "%u\n", phy->field); \
540 }
541
542 #define sas_phy_linkerror_attr(field) \
543 sas_phy_show_linkerror(field) \
544 static DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
545
546
547 static ssize_t
548 show_sas_device_type(struct device *dev,
549 struct device_attribute *attr, char *buf)
550 {
551 struct sas_phy *phy = transport_class_to_phy(dev);
552
553 if (!phy->identify.device_type)
554 return snprintf(buf, 20, "none\n");
555 return get_sas_device_type_names(phy->identify.device_type, buf);
556 }
557 static DEVICE_ATTR(device_type, S_IRUGO, show_sas_device_type, NULL);
558
559 static ssize_t do_sas_phy_enable(struct device *dev,
560 size_t count, int enable)
561 {
562 struct sas_phy *phy = transport_class_to_phy(dev);
563 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
564 struct sas_internal *i = to_sas_internal(shost->transportt);
565 int error;
566
567 error = i->f->phy_enable(phy, enable);
568 if (error)
569 return error;
570 phy->enabled = enable;
571 return count;
572 };
573
574 static ssize_t
575 store_sas_phy_enable(struct device *dev, struct device_attribute *attr,
576 const char *buf, size_t count)
577 {
578 if (count < 1)
579 return -EINVAL;
580
581 switch (buf[0]) {
582 case '0':
583 do_sas_phy_enable(dev, count, 0);
584 break;
585 case '1':
586 do_sas_phy_enable(dev, count, 1);
587 break;
588 default:
589 return -EINVAL;
590 }
591
592 return count;
593 }
594
595 static ssize_t
596 show_sas_phy_enable(struct device *dev, struct device_attribute *attr,
597 char *buf)
598 {
599 struct sas_phy *phy = transport_class_to_phy(dev);
600
601 return snprintf(buf, 20, "%d", phy->enabled);
602 }
603
604 static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, show_sas_phy_enable,
605 store_sas_phy_enable);
606
607 static ssize_t
608 do_sas_phy_reset(struct device *dev, size_t count, int hard_reset)
609 {
610 struct sas_phy *phy = transport_class_to_phy(dev);
611 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
612 struct sas_internal *i = to_sas_internal(shost->transportt);
613 int error;
614
615 error = i->f->phy_reset(phy, hard_reset);
616 if (error)
617 return error;
618 phy->enabled = 1;
619 return count;
620 };
621
622 static ssize_t
623 store_sas_link_reset(struct device *dev, struct device_attribute *attr,
624 const char *buf, size_t count)
625 {
626 return do_sas_phy_reset(dev, count, 0);
627 }
628 static DEVICE_ATTR(link_reset, S_IWUSR, NULL, store_sas_link_reset);
629
630 static ssize_t
631 store_sas_hard_reset(struct device *dev, struct device_attribute *attr,
632 const char *buf, size_t count)
633 {
634 return do_sas_phy_reset(dev, count, 1);
635 }
636 static DEVICE_ATTR(hard_reset, S_IWUSR, NULL, store_sas_hard_reset);
637
638 sas_phy_protocol_attr(identify.initiator_port_protocols,
639 initiator_port_protocols);
640 sas_phy_protocol_attr(identify.target_port_protocols,
641 target_port_protocols);
642 sas_phy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
643 unsigned long long);
644 sas_phy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
645 //sas_phy_simple_attr(port_identifier, port_identifier, "%d\n", int);
646 sas_phy_linkspeed_attr(negotiated_linkrate);
647 sas_phy_linkspeed_attr(minimum_linkrate_hw);
648 sas_phy_linkspeed_rw_attr(minimum_linkrate);
649 sas_phy_linkspeed_attr(maximum_linkrate_hw);
650 sas_phy_linkspeed_rw_attr(maximum_linkrate);
651 sas_phy_linkerror_attr(invalid_dword_count);
652 sas_phy_linkerror_attr(running_disparity_error_count);
653 sas_phy_linkerror_attr(loss_of_dword_sync_count);
654 sas_phy_linkerror_attr(phy_reset_problem_count);
655
656 static int sas_phy_setup(struct transport_container *tc, struct device *dev,
657 struct device *cdev)
658 {
659 struct sas_phy *phy = dev_to_phy(dev);
660 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
661 struct sas_internal *i = to_sas_internal(shost->transportt);
662
663 if (i->f->phy_setup)
664 i->f->phy_setup(phy);
665
666 return 0;
667 }
668
669 static DECLARE_TRANSPORT_CLASS(sas_phy_class,
670 "sas_phy", sas_phy_setup, NULL, NULL);
671
672 static int sas_phy_match(struct attribute_container *cont, struct device *dev)
673 {
674 struct Scsi_Host *shost;
675 struct sas_internal *i;
676
677 if (!scsi_is_sas_phy(dev))
678 return 0;
679 shost = dev_to_shost(dev->parent);
680
681 if (!shost->transportt)
682 return 0;
683 if (shost->transportt->host_attrs.ac.class !=
684 &sas_host_class.class)
685 return 0;
686
687 i = to_sas_internal(shost->transportt);
688 return &i->phy_attr_cont.ac == cont;
689 }
690
691 static void sas_phy_release(struct device *dev)
692 {
693 struct sas_phy *phy = dev_to_phy(dev);
694 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
695 struct sas_internal *i = to_sas_internal(shost->transportt);
696
697 if (i->f->phy_release)
698 i->f->phy_release(phy);
699 put_device(dev->parent);
700 kfree(phy);
701 }
702
703 /**
704 * sas_phy_alloc - allocates and initialize a SAS PHY structure
705 * @parent: Parent device
706 * @number: Phy index
707 *
708 * Allocates an SAS PHY structure. It will be added in the device tree
709 * below the device specified by @parent, which has to be either a Scsi_Host
710 * or sas_rphy.
711 *
712 * Returns:
713 * SAS PHY allocated or %NULL if the allocation failed.
714 */
715 struct sas_phy *sas_phy_alloc(struct device *parent, int number)
716 {
717 struct Scsi_Host *shost = dev_to_shost(parent);
718 struct sas_phy *phy;
719
720 phy = kzalloc(sizeof(*phy), GFP_KERNEL);
721 if (!phy)
722 return NULL;
723
724 phy->number = number;
725 phy->enabled = 1;
726
727 device_initialize(&phy->dev);
728 phy->dev.parent = get_device(parent);
729 phy->dev.release = sas_phy_release;
730 INIT_LIST_HEAD(&phy->port_siblings);
731 if (scsi_is_sas_expander_device(parent)) {
732 struct sas_rphy *rphy = dev_to_rphy(parent);
733 dev_set_name(&phy->dev, "phy-%d:%d:%d", shost->host_no,
734 rphy->scsi_target_id, number);
735 } else
736 dev_set_name(&phy->dev, "phy-%d:%d", shost->host_no, number);
737
738 transport_setup_device(&phy->dev);
739
740 return phy;
741 }
742 EXPORT_SYMBOL(sas_phy_alloc);
743
744 /**
745 * sas_phy_add - add a SAS PHY to the device hierarchy
746 * @phy: The PHY to be added
747 *
748 * Publishes a SAS PHY to the rest of the system.
749 */
750 int sas_phy_add(struct sas_phy *phy)
751 {
752 int error;
753
754 error = device_add(&phy->dev);
755 if (!error) {
756 transport_add_device(&phy->dev);
757 transport_configure_device(&phy->dev);
758 }
759
760 return error;
761 }
762 EXPORT_SYMBOL(sas_phy_add);
763
764 /**
765 * sas_phy_free - free a SAS PHY
766 * @phy: SAS PHY to free
767 *
768 * Frees the specified SAS PHY.
769 *
770 * Note:
771 * This function must only be called on a PHY that has not
772 * successfully been added using sas_phy_add().
773 */
774 void sas_phy_free(struct sas_phy *phy)
775 {
776 transport_destroy_device(&phy->dev);
777 put_device(&phy->dev);
778 }
779 EXPORT_SYMBOL(sas_phy_free);
780
781 /**
782 * sas_phy_delete - remove SAS PHY
783 * @phy: SAS PHY to remove
784 *
785 * Removes the specified SAS PHY. If the SAS PHY has an
786 * associated remote PHY it is removed before.
787 */
788 void
789 sas_phy_delete(struct sas_phy *phy)
790 {
791 struct device *dev = &phy->dev;
792
793 /* this happens if the phy is still part of a port when deleted */
794 BUG_ON(!list_empty(&phy->port_siblings));
795
796 transport_remove_device(dev);
797 device_del(dev);
798 transport_destroy_device(dev);
799 put_device(dev);
800 }
801 EXPORT_SYMBOL(sas_phy_delete);
802
803 /**
804 * scsi_is_sas_phy - check if a struct device represents a SAS PHY
805 * @dev: device to check
806 *
807 * Returns:
808 * %1 if the device represents a SAS PHY, %0 else
809 */
810 int scsi_is_sas_phy(const struct device *dev)
811 {
812 return dev->release == sas_phy_release;
813 }
814 EXPORT_SYMBOL(scsi_is_sas_phy);
815
816 /*
817 * SAS Port attributes
818 */
819 #define sas_port_show_simple(field, name, format_string, cast) \
820 static ssize_t \
821 show_sas_port_##name(struct device *dev, \
822 struct device_attribute *attr, char *buf) \
823 { \
824 struct sas_port *port = transport_class_to_sas_port(dev); \
825 \
826 return snprintf(buf, 20, format_string, cast port->field); \
827 }
828
829 #define sas_port_simple_attr(field, name, format_string, type) \
830 sas_port_show_simple(field, name, format_string, (type)) \
831 static DEVICE_ATTR(name, S_IRUGO, show_sas_port_##name, NULL)
832
833 sas_port_simple_attr(num_phys, num_phys, "%d\n", int);
834
835 static DECLARE_TRANSPORT_CLASS(sas_port_class,
836 "sas_port", NULL, NULL, NULL);
837
838 static int sas_port_match(struct attribute_container *cont, struct device *dev)
839 {
840 struct Scsi_Host *shost;
841 struct sas_internal *i;
842
843 if (!scsi_is_sas_port(dev))
844 return 0;
845 shost = dev_to_shost(dev->parent);
846
847 if (!shost->transportt)
848 return 0;
849 if (shost->transportt->host_attrs.ac.class !=
850 &sas_host_class.class)
851 return 0;
852
853 i = to_sas_internal(shost->transportt);
854 return &i->port_attr_cont.ac == cont;
855 }
856
857
858 static void sas_port_release(struct device *dev)
859 {
860 struct sas_port *port = dev_to_sas_port(dev);
861
862 BUG_ON(!list_empty(&port->phy_list));
863
864 put_device(dev->parent);
865 kfree(port);
866 }
867
868 static void sas_port_create_link(struct sas_port *port,
869 struct sas_phy *phy)
870 {
871 int res;
872
873 res = sysfs_create_link(&port->dev.kobj, &phy->dev.kobj,
874 dev_name(&phy->dev));
875 if (res)
876 goto err;
877 res = sysfs_create_link(&phy->dev.kobj, &port->dev.kobj, "port");
878 if (res)
879 goto err;
880 return;
881 err:
882 printk(KERN_ERR "%s: Cannot create port links, err=%d\n",
883 __func__, res);
884 }
885
886 static void sas_port_delete_link(struct sas_port *port,
887 struct sas_phy *phy)
888 {
889 sysfs_remove_link(&port->dev.kobj, dev_name(&phy->dev));
890 sysfs_remove_link(&phy->dev.kobj, "port");
891 }
892
893 /** sas_port_alloc - allocate and initialize a SAS port structure
894 *
895 * @parent: parent device
896 * @port_id: port number
897 *
898 * Allocates a SAS port structure. It will be added to the device tree
899 * below the device specified by @parent which must be either a Scsi_Host
900 * or a sas_expander_device.
901 *
902 * Returns %NULL on error
903 */
904 struct sas_port *sas_port_alloc(struct device *parent, int port_id)
905 {
906 struct Scsi_Host *shost = dev_to_shost(parent);
907 struct sas_port *port;
908
909 port = kzalloc(sizeof(*port), GFP_KERNEL);
910 if (!port)
911 return NULL;
912
913 port->port_identifier = port_id;
914
915 device_initialize(&port->dev);
916
917 port->dev.parent = get_device(parent);
918 port->dev.release = sas_port_release;
919
920 mutex_init(&port->phy_list_mutex);
921 INIT_LIST_HEAD(&port->phy_list);
922
923 if (scsi_is_sas_expander_device(parent)) {
924 struct sas_rphy *rphy = dev_to_rphy(parent);
925 dev_set_name(&port->dev, "port-%d:%d:%d", shost->host_no,
926 rphy->scsi_target_id, port->port_identifier);
927 } else
928 dev_set_name(&port->dev, "port-%d:%d", shost->host_no,
929 port->port_identifier);
930
931 transport_setup_device(&port->dev);
932
933 return port;
934 }
935 EXPORT_SYMBOL(sas_port_alloc);
936
937 /** sas_port_alloc_num - allocate and initialize a SAS port structure
938 *
939 * @parent: parent device
940 *
941 * Allocates a SAS port structure and a number to go with it. This
942 * interface is really for adapters where the port number has no
943 * meansing, so the sas class should manage them. It will be added to
944 * the device tree below the device specified by @parent which must be
945 * either a Scsi_Host or a sas_expander_device.
946 *
947 * Returns %NULL on error
948 */
949 struct sas_port *sas_port_alloc_num(struct device *parent)
950 {
951 int index;
952 struct Scsi_Host *shost = dev_to_shost(parent);
953 struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
954
955 /* FIXME: use idr for this eventually */
956 mutex_lock(&sas_host->lock);
957 if (scsi_is_sas_expander_device(parent)) {
958 struct sas_rphy *rphy = dev_to_rphy(parent);
959 struct sas_expander_device *exp = rphy_to_expander_device(rphy);
960
961 index = exp->next_port_id++;
962 } else
963 index = sas_host->next_port_id++;
964 mutex_unlock(&sas_host->lock);
965 return sas_port_alloc(parent, index);
966 }
967 EXPORT_SYMBOL(sas_port_alloc_num);
968
969 /**
970 * sas_port_add - add a SAS port to the device hierarchy
971 * @port: port to be added
972 *
973 * publishes a port to the rest of the system
974 */
975 int sas_port_add(struct sas_port *port)
976 {
977 int error;
978
979 /* No phys should be added until this is made visible */
980 BUG_ON(!list_empty(&port->phy_list));
981
982 error = device_add(&port->dev);
983
984 if (error)
985 return error;
986
987 transport_add_device(&port->dev);
988 transport_configure_device(&port->dev);
989
990 return 0;
991 }
992 EXPORT_SYMBOL(sas_port_add);
993
994 /**
995 * sas_port_free - free a SAS PORT
996 * @port: SAS PORT to free
997 *
998 * Frees the specified SAS PORT.
999 *
1000 * Note:
1001 * This function must only be called on a PORT that has not
1002 * successfully been added using sas_port_add().
1003 */
1004 void sas_port_free(struct sas_port *port)
1005 {
1006 transport_destroy_device(&port->dev);
1007 put_device(&port->dev);
1008 }
1009 EXPORT_SYMBOL(sas_port_free);
1010
1011 /**
1012 * sas_port_delete - remove SAS PORT
1013 * @port: SAS PORT to remove
1014 *
1015 * Removes the specified SAS PORT. If the SAS PORT has an
1016 * associated phys, unlink them from the port as well.
1017 */
1018 void sas_port_delete(struct sas_port *port)
1019 {
1020 struct device *dev = &port->dev;
1021 struct sas_phy *phy, *tmp_phy;
1022
1023 if (port->rphy) {
1024 sas_rphy_delete(port->rphy);
1025 port->rphy = NULL;
1026 }
1027
1028 mutex_lock(&port->phy_list_mutex);
1029 list_for_each_entry_safe(phy, tmp_phy, &port->phy_list,
1030 port_siblings) {
1031 sas_port_delete_link(port, phy);
1032 list_del_init(&phy->port_siblings);
1033 }
1034 mutex_unlock(&port->phy_list_mutex);
1035
1036 if (port->is_backlink) {
1037 struct device *parent = port->dev.parent;
1038
1039 sysfs_remove_link(&port->dev.kobj, dev_name(parent));
1040 port->is_backlink = 0;
1041 }
1042
1043 transport_remove_device(dev);
1044 device_del(dev);
1045 transport_destroy_device(dev);
1046 put_device(dev);
1047 }
1048 EXPORT_SYMBOL(sas_port_delete);
1049
1050 /**
1051 * scsi_is_sas_port - check if a struct device represents a SAS port
1052 * @dev: device to check
1053 *
1054 * Returns:
1055 * %1 if the device represents a SAS Port, %0 else
1056 */
1057 int scsi_is_sas_port(const struct device *dev)
1058 {
1059 return dev->release == sas_port_release;
1060 }
1061 EXPORT_SYMBOL(scsi_is_sas_port);
1062
1063 /**
1064 * sas_port_get_phy - try to take a reference on a port member
1065 * @port: port to check
1066 */
1067 struct sas_phy *sas_port_get_phy(struct sas_port *port)
1068 {
1069 struct sas_phy *phy;
1070
1071 mutex_lock(&port->phy_list_mutex);
1072 if (list_empty(&port->phy_list))
1073 phy = NULL;
1074 else {
1075 struct list_head *ent = port->phy_list.next;
1076
1077 phy = list_entry(ent, typeof(*phy), port_siblings);
1078 get_device(&phy->dev);
1079 }
1080 mutex_unlock(&port->phy_list_mutex);
1081
1082 return phy;
1083 }
1084 EXPORT_SYMBOL(sas_port_get_phy);
1085
1086 /**
1087 * sas_port_add_phy - add another phy to a port to form a wide port
1088 * @port: port to add the phy to
1089 * @phy: phy to add
1090 *
1091 * When a port is initially created, it is empty (has no phys). All
1092 * ports must have at least one phy to operated, and all wide ports
1093 * must have at least two. The current code makes no difference
1094 * between ports and wide ports, but the only object that can be
1095 * connected to a remote device is a port, so ports must be formed on
1096 * all devices with phys if they're connected to anything.
1097 */
1098 void sas_port_add_phy(struct sas_port *port, struct sas_phy *phy)
1099 {
1100 mutex_lock(&port->phy_list_mutex);
1101 if (unlikely(!list_empty(&phy->port_siblings))) {
1102 /* make sure we're already on this port */
1103 struct sas_phy *tmp;
1104
1105 list_for_each_entry(tmp, &port->phy_list, port_siblings)
1106 if (tmp == phy)
1107 break;
1108 /* If this trips, you added a phy that was already
1109 * part of a different port */
1110 if (unlikely(tmp != phy)) {
1111 dev_printk(KERN_ERR, &port->dev, "trying to add phy %s fails: it's already part of another port\n",
1112 dev_name(&phy->dev));
1113 BUG();
1114 }
1115 } else {
1116 sas_port_create_link(port, phy);
1117 list_add_tail(&phy->port_siblings, &port->phy_list);
1118 port->num_phys++;
1119 }
1120 mutex_unlock(&port->phy_list_mutex);
1121 }
1122 EXPORT_SYMBOL(sas_port_add_phy);
1123
1124 /**
1125 * sas_port_delete_phy - remove a phy from a port or wide port
1126 * @port: port to remove the phy from
1127 * @phy: phy to remove
1128 *
1129 * This operation is used for tearing down ports again. It must be
1130 * done to every port or wide port before calling sas_port_delete.
1131 */
1132 void sas_port_delete_phy(struct sas_port *port, struct sas_phy *phy)
1133 {
1134 mutex_lock(&port->phy_list_mutex);
1135 sas_port_delete_link(port, phy);
1136 list_del_init(&phy->port_siblings);
1137 port->num_phys--;
1138 mutex_unlock(&port->phy_list_mutex);
1139 }
1140 EXPORT_SYMBOL(sas_port_delete_phy);
1141
1142 void sas_port_mark_backlink(struct sas_port *port)
1143 {
1144 int res;
1145 struct device *parent = port->dev.parent->parent->parent;
1146
1147 if (port->is_backlink)
1148 return;
1149 port->is_backlink = 1;
1150 res = sysfs_create_link(&port->dev.kobj, &parent->kobj,
1151 dev_name(parent));
1152 if (res)
1153 goto err;
1154 return;
1155 err:
1156 printk(KERN_ERR "%s: Cannot create port backlink, err=%d\n",
1157 __func__, res);
1158
1159 }
1160 EXPORT_SYMBOL(sas_port_mark_backlink);
1161
1162 /*
1163 * SAS remote PHY attributes.
1164 */
1165
1166 #define sas_rphy_show_simple(field, name, format_string, cast) \
1167 static ssize_t \
1168 show_sas_rphy_##name(struct device *dev, \
1169 struct device_attribute *attr, char *buf) \
1170 { \
1171 struct sas_rphy *rphy = transport_class_to_rphy(dev); \
1172 \
1173 return snprintf(buf, 20, format_string, cast rphy->field); \
1174 }
1175
1176 #define sas_rphy_simple_attr(field, name, format_string, type) \
1177 sas_rphy_show_simple(field, name, format_string, (type)) \
1178 static SAS_DEVICE_ATTR(rphy, name, S_IRUGO, \
1179 show_sas_rphy_##name, NULL)
1180
1181 #define sas_rphy_show_protocol(field, name) \
1182 static ssize_t \
1183 show_sas_rphy_##name(struct device *dev, \
1184 struct device_attribute *attr, char *buf) \
1185 { \
1186 struct sas_rphy *rphy = transport_class_to_rphy(dev); \
1187 \
1188 if (!rphy->field) \
1189 return snprintf(buf, 20, "none\n"); \
1190 return get_sas_protocol_names(rphy->field, buf); \
1191 }
1192
1193 #define sas_rphy_protocol_attr(field, name) \
1194 sas_rphy_show_protocol(field, name) \
1195 static SAS_DEVICE_ATTR(rphy, name, S_IRUGO, \
1196 show_sas_rphy_##name, NULL)
1197
1198 static ssize_t
1199 show_sas_rphy_device_type(struct device *dev,
1200 struct device_attribute *attr, char *buf)
1201 {
1202 struct sas_rphy *rphy = transport_class_to_rphy(dev);
1203
1204 if (!rphy->identify.device_type)
1205 return snprintf(buf, 20, "none\n");
1206 return get_sas_device_type_names(
1207 rphy->identify.device_type, buf);
1208 }
1209
1210 static SAS_DEVICE_ATTR(rphy, device_type, S_IRUGO,
1211 show_sas_rphy_device_type, NULL);
1212
1213 static ssize_t
1214 show_sas_rphy_enclosure_identifier(struct device *dev,
1215 struct device_attribute *attr, char *buf)
1216 {
1217 struct sas_rphy *rphy = transport_class_to_rphy(dev);
1218 struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
1219 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
1220 struct sas_internal *i = to_sas_internal(shost->transportt);
1221 u64 identifier;
1222 int error;
1223
1224 /*
1225 * Only devices behind an expander are supported, because the
1226 * enclosure identifier is a SMP feature.
1227 */
1228 if (scsi_is_sas_phy_local(phy))
1229 return -EINVAL;
1230
1231 error = i->f->get_enclosure_identifier(rphy, &identifier);
1232 if (error)
1233 return error;
1234 return sprintf(buf, "0x%llx\n", (unsigned long long)identifier);
1235 }
1236
1237 static SAS_DEVICE_ATTR(rphy, enclosure_identifier, S_IRUGO,
1238 show_sas_rphy_enclosure_identifier, NULL);
1239
1240 static ssize_t
1241 show_sas_rphy_bay_identifier(struct device *dev,
1242 struct device_attribute *attr, char *buf)
1243 {
1244 struct sas_rphy *rphy = transport_class_to_rphy(dev);
1245 struct sas_phy *phy = dev_to_phy(rphy->dev.parent);
1246 struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
1247 struct sas_internal *i = to_sas_internal(shost->transportt);
1248 int val;
1249
1250 if (scsi_is_sas_phy_local(phy))
1251 return -EINVAL;
1252
1253 val = i->f->get_bay_identifier(rphy);
1254 if (val < 0)
1255 return val;
1256 return sprintf(buf, "%d\n", val);
1257 }
1258
1259 static SAS_DEVICE_ATTR(rphy, bay_identifier, S_IRUGO,
1260 show_sas_rphy_bay_identifier, NULL);
1261
1262 sas_rphy_protocol_attr(identify.initiator_port_protocols,
1263 initiator_port_protocols);
1264 sas_rphy_protocol_attr(identify.target_port_protocols, target_port_protocols);
1265 sas_rphy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
1266 unsigned long long);
1267 sas_rphy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
1268
1269 /* only need 8 bytes of data plus header (4 or 8) */
1270 #define BUF_SIZE 64
1271
1272 int sas_read_port_mode_page(struct scsi_device *sdev)
1273 {
1274 char *buffer = kzalloc(BUF_SIZE, GFP_KERNEL), *msdata;
1275 struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
1276 struct scsi_mode_data mode_data;
1277 int res, error;
1278
1279 if (!buffer)
1280 return -ENOMEM;
1281
1282 res = scsi_mode_sense(sdev, 1, 0x19, buffer, BUF_SIZE, 30*HZ, 3,
1283 &mode_data, NULL);
1284
1285 error = -EINVAL;
1286 if (!scsi_status_is_good(res))
1287 goto out;
1288
1289 msdata = buffer + mode_data.header_length +
1290 mode_data.block_descriptor_length;
1291
1292 if (msdata - buffer > BUF_SIZE - 8)
1293 goto out;
1294
1295 error = 0;
1296
1297 rdev->ready_led_meaning = msdata[2] & 0x10 ? 1 : 0;
1298 rdev->I_T_nexus_loss_timeout = (msdata[4] << 8) + msdata[5];
1299 rdev->initiator_response_timeout = (msdata[6] << 8) + msdata[7];
1300
1301 out:
1302 kfree(buffer);
1303 return error;
1304 }
1305 EXPORT_SYMBOL(sas_read_port_mode_page);
1306
1307 static DECLARE_TRANSPORT_CLASS(sas_end_dev_class,
1308 "sas_end_device", NULL, NULL, NULL);
1309
1310 #define sas_end_dev_show_simple(field, name, format_string, cast) \
1311 static ssize_t \
1312 show_sas_end_dev_##name(struct device *dev, \
1313 struct device_attribute *attr, char *buf) \
1314 { \
1315 struct sas_rphy *rphy = transport_class_to_rphy(dev); \
1316 struct sas_end_device *rdev = rphy_to_end_device(rphy); \
1317 \
1318 return snprintf(buf, 20, format_string, cast rdev->field); \
1319 }
1320
1321 #define sas_end_dev_simple_attr(field, name, format_string, type) \
1322 sas_end_dev_show_simple(field, name, format_string, (type)) \
1323 static SAS_DEVICE_ATTR(end_dev, name, S_IRUGO, \
1324 show_sas_end_dev_##name, NULL)
1325
1326 sas_end_dev_simple_attr(ready_led_meaning, ready_led_meaning, "%d\n", int);
1327 sas_end_dev_simple_attr(I_T_nexus_loss_timeout, I_T_nexus_loss_timeout,
1328 "%d\n", int);
1329 sas_end_dev_simple_attr(initiator_response_timeout, initiator_response_timeout,
1330 "%d\n", int);
1331 sas_end_dev_simple_attr(tlr_supported, tlr_supported,
1332 "%d\n", int);
1333 sas_end_dev_simple_attr(tlr_enabled, tlr_enabled,
1334 "%d\n", int);
1335
1336 static DECLARE_TRANSPORT_CLASS(sas_expander_class,
1337 "sas_expander", NULL, NULL, NULL);
1338
1339 #define sas_expander_show_simple(field, name, format_string, cast) \
1340 static ssize_t \
1341 show_sas_expander_##name(struct device *dev, \
1342 struct device_attribute *attr, char *buf) \
1343 { \
1344 struct sas_rphy *rphy = transport_class_to_rphy(dev); \
1345 struct sas_expander_device *edev = rphy_to_expander_device(rphy); \
1346 \
1347 return snprintf(buf, 20, format_string, cast edev->field); \
1348 }
1349
1350 #define sas_expander_simple_attr(field, name, format_string, type) \
1351 sas_expander_show_simple(field, name, format_string, (type)) \
1352 static SAS_DEVICE_ATTR(expander, name, S_IRUGO, \
1353 show_sas_expander_##name, NULL)
1354
1355 sas_expander_simple_attr(vendor_id, vendor_id, "%s\n", char *);
1356 sas_expander_simple_attr(product_id, product_id, "%s\n", char *);
1357 sas_expander_simple_attr(product_rev, product_rev, "%s\n", char *);
1358 sas_expander_simple_attr(component_vendor_id, component_vendor_id,
1359 "%s\n", char *);
1360 sas_expander_simple_attr(component_id, component_id, "%u\n", unsigned int);
1361 sas_expander_simple_attr(component_revision_id, component_revision_id, "%u\n",
1362 unsigned int);
1363 sas_expander_simple_attr(level, level, "%d\n", int);
1364
1365 static DECLARE_TRANSPORT_CLASS(sas_rphy_class,
1366 "sas_device", NULL, NULL, NULL);
1367
1368 static int sas_rphy_match(struct attribute_container *cont, struct device *dev)
1369 {
1370 struct Scsi_Host *shost;
1371 struct sas_internal *i;
1372
1373 if (!scsi_is_sas_rphy(dev))
1374 return 0;
1375 shost = dev_to_shost(dev->parent->parent);
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->rphy_attr_cont.ac == cont;
1385 }
1386
1387 static int sas_end_dev_match(struct attribute_container *cont,
1388 struct device *dev)
1389 {
1390 struct Scsi_Host *shost;
1391 struct sas_internal *i;
1392 struct sas_rphy *rphy;
1393
1394 if (!scsi_is_sas_rphy(dev))
1395 return 0;
1396 shost = dev_to_shost(dev->parent->parent);
1397 rphy = dev_to_rphy(dev);
1398
1399 if (!shost->transportt)
1400 return 0;
1401 if (shost->transportt->host_attrs.ac.class !=
1402 &sas_host_class.class)
1403 return 0;
1404
1405 i = to_sas_internal(shost->transportt);
1406 return &i->end_dev_attr_cont.ac == cont &&
1407 rphy->identify.device_type == SAS_END_DEVICE;
1408 }
1409
1410 static int sas_expander_match(struct attribute_container *cont,
1411 struct device *dev)
1412 {
1413 struct Scsi_Host *shost;
1414 struct sas_internal *i;
1415 struct sas_rphy *rphy;
1416
1417 if (!scsi_is_sas_rphy(dev))
1418 return 0;
1419 shost = dev_to_shost(dev->parent->parent);
1420 rphy = dev_to_rphy(dev);
1421
1422 if (!shost->transportt)
1423 return 0;
1424 if (shost->transportt->host_attrs.ac.class !=
1425 &sas_host_class.class)
1426 return 0;
1427
1428 i = to_sas_internal(shost->transportt);
1429 return &i->expander_attr_cont.ac == cont &&
1430 (rphy->identify.device_type == SAS_EDGE_EXPANDER_DEVICE ||
1431 rphy->identify.device_type == SAS_FANOUT_EXPANDER_DEVICE);
1432 }
1433
1434 static void sas_expander_release(struct device *dev)
1435 {
1436 struct sas_rphy *rphy = dev_to_rphy(dev);
1437 struct sas_expander_device *edev = rphy_to_expander_device(rphy);
1438
1439 if (rphy->q)
1440 blk_cleanup_queue(rphy->q);
1441
1442 put_device(dev->parent);
1443 kfree(edev);
1444 }
1445
1446 static void sas_end_device_release(struct device *dev)
1447 {
1448 struct sas_rphy *rphy = dev_to_rphy(dev);
1449 struct sas_end_device *edev = rphy_to_end_device(rphy);
1450
1451 if (rphy->q)
1452 blk_cleanup_queue(rphy->q);
1453
1454 put_device(dev->parent);
1455 kfree(edev);
1456 }
1457
1458 /**
1459 * sas_rphy_initialize - common rphy intialization
1460 * @rphy: rphy to initialise
1461 *
1462 * Used by both sas_end_device_alloc() and sas_expander_alloc() to
1463 * initialise the common rphy component of each.
1464 */
1465 static void sas_rphy_initialize(struct sas_rphy *rphy)
1466 {
1467 INIT_LIST_HEAD(&rphy->list);
1468 }
1469
1470 /**
1471 * sas_end_device_alloc - allocate an rphy for an end device
1472 * @parent: which port
1473 *
1474 * Allocates an SAS remote PHY structure, connected to @parent.
1475 *
1476 * Returns:
1477 * SAS PHY allocated or %NULL if the allocation failed.
1478 */
1479 struct sas_rphy *sas_end_device_alloc(struct sas_port *parent)
1480 {
1481 struct Scsi_Host *shost = dev_to_shost(&parent->dev);
1482 struct sas_end_device *rdev;
1483
1484 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1485 if (!rdev) {
1486 return NULL;
1487 }
1488
1489 device_initialize(&rdev->rphy.dev);
1490 rdev->rphy.dev.parent = get_device(&parent->dev);
1491 rdev->rphy.dev.release = sas_end_device_release;
1492 if (scsi_is_sas_expander_device(parent->dev.parent)) {
1493 struct sas_rphy *rphy = dev_to_rphy(parent->dev.parent);
1494 dev_set_name(&rdev->rphy.dev, "end_device-%d:%d:%d",
1495 shost->host_no, rphy->scsi_target_id,
1496 parent->port_identifier);
1497 } else
1498 dev_set_name(&rdev->rphy.dev, "end_device-%d:%d",
1499 shost->host_no, parent->port_identifier);
1500 rdev->rphy.identify.device_type = SAS_END_DEVICE;
1501 sas_rphy_initialize(&rdev->rphy);
1502 transport_setup_device(&rdev->rphy.dev);
1503
1504 return &rdev->rphy;
1505 }
1506 EXPORT_SYMBOL(sas_end_device_alloc);
1507
1508 /**
1509 * sas_expander_alloc - allocate an rphy for an end device
1510 * @parent: which port
1511 * @type: SAS_EDGE_EXPANDER_DEVICE or SAS_FANOUT_EXPANDER_DEVICE
1512 *
1513 * Allocates an SAS remote PHY structure, connected to @parent.
1514 *
1515 * Returns:
1516 * SAS PHY allocated or %NULL if the allocation failed.
1517 */
1518 struct sas_rphy *sas_expander_alloc(struct sas_port *parent,
1519 enum sas_device_type type)
1520 {
1521 struct Scsi_Host *shost = dev_to_shost(&parent->dev);
1522 struct sas_expander_device *rdev;
1523 struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1524
1525 BUG_ON(type != SAS_EDGE_EXPANDER_DEVICE &&
1526 type != SAS_FANOUT_EXPANDER_DEVICE);
1527
1528 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1529 if (!rdev) {
1530 return NULL;
1531 }
1532
1533 device_initialize(&rdev->rphy.dev);
1534 rdev->rphy.dev.parent = get_device(&parent->dev);
1535 rdev->rphy.dev.release = sas_expander_release;
1536 mutex_lock(&sas_host->lock);
1537 rdev->rphy.scsi_target_id = sas_host->next_expander_id++;
1538 mutex_unlock(&sas_host->lock);
1539 dev_set_name(&rdev->rphy.dev, "expander-%d:%d",
1540 shost->host_no, rdev->rphy.scsi_target_id);
1541 rdev->rphy.identify.device_type = type;
1542 sas_rphy_initialize(&rdev->rphy);
1543 transport_setup_device(&rdev->rphy.dev);
1544
1545 return &rdev->rphy;
1546 }
1547 EXPORT_SYMBOL(sas_expander_alloc);
1548
1549 /**
1550 * sas_rphy_add - add a SAS remote PHY to the device hierarchy
1551 * @rphy: The remote PHY to be added
1552 *
1553 * Publishes a SAS remote PHY to the rest of the system.
1554 */
1555 int sas_rphy_add(struct sas_rphy *rphy)
1556 {
1557 struct sas_port *parent = dev_to_sas_port(rphy->dev.parent);
1558 struct Scsi_Host *shost = dev_to_shost(parent->dev.parent);
1559 struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1560 struct sas_identify *identify = &rphy->identify;
1561 int error;
1562
1563 if (parent->rphy)
1564 return -ENXIO;
1565 parent->rphy = rphy;
1566
1567 error = device_add(&rphy->dev);
1568 if (error)
1569 return error;
1570 transport_add_device(&rphy->dev);
1571 transport_configure_device(&rphy->dev);
1572 if (sas_bsg_initialize(shost, rphy))
1573 printk("fail to a bsg device %s\n", dev_name(&rphy->dev));
1574
1575
1576 mutex_lock(&sas_host->lock);
1577 list_add_tail(&rphy->list, &sas_host->rphy_list);
1578 if (identify->device_type == SAS_END_DEVICE &&
1579 (identify->target_port_protocols &
1580 (SAS_PROTOCOL_SSP|SAS_PROTOCOL_STP|SAS_PROTOCOL_SATA)))
1581 rphy->scsi_target_id = sas_host->next_target_id++;
1582 else if (identify->device_type == SAS_END_DEVICE)
1583 rphy->scsi_target_id = -1;
1584 mutex_unlock(&sas_host->lock);
1585
1586 if (identify->device_type == SAS_END_DEVICE &&
1587 rphy->scsi_target_id != -1) {
1588 int lun;
1589
1590 if (identify->target_port_protocols & SAS_PROTOCOL_SSP)
1591 lun = SCAN_WILD_CARD;
1592 else
1593 lun = 0;
1594
1595 scsi_scan_target(&rphy->dev, 0, rphy->scsi_target_id, lun, 0);
1596 }
1597
1598 return 0;
1599 }
1600 EXPORT_SYMBOL(sas_rphy_add);
1601
1602 /**
1603 * sas_rphy_free - free a SAS remote PHY
1604 * @rphy: SAS remote PHY to free
1605 *
1606 * Frees the specified SAS remote PHY.
1607 *
1608 * Note:
1609 * This function must only be called on a remote
1610 * PHY that has not successfully been added using
1611 * sas_rphy_add() (or has been sas_rphy_remove()'d)
1612 */
1613 void sas_rphy_free(struct sas_rphy *rphy)
1614 {
1615 struct device *dev = &rphy->dev;
1616 struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent->parent);
1617 struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1618
1619 mutex_lock(&sas_host->lock);
1620 list_del(&rphy->list);
1621 mutex_unlock(&sas_host->lock);
1622
1623 sas_bsg_remove(shost, rphy);
1624
1625 transport_destroy_device(dev);
1626
1627 put_device(dev);
1628 }
1629 EXPORT_SYMBOL(sas_rphy_free);
1630
1631 /**
1632 * sas_rphy_delete - remove and free SAS remote PHY
1633 * @rphy: SAS remote PHY to remove and free
1634 *
1635 * Removes the specified SAS remote PHY and frees it.
1636 */
1637 void
1638 sas_rphy_delete(struct sas_rphy *rphy)
1639 {
1640 sas_rphy_remove(rphy);
1641 sas_rphy_free(rphy);
1642 }
1643 EXPORT_SYMBOL(sas_rphy_delete);
1644
1645 /**
1646 * sas_rphy_unlink - unlink SAS remote PHY
1647 * @rphy: SAS remote phy to unlink from its parent port
1648 *
1649 * Removes port reference to an rphy
1650 */
1651 void sas_rphy_unlink(struct sas_rphy *rphy)
1652 {
1653 struct sas_port *parent = dev_to_sas_port(rphy->dev.parent);
1654
1655 parent->rphy = NULL;
1656 }
1657 EXPORT_SYMBOL(sas_rphy_unlink);
1658
1659 /**
1660 * sas_rphy_remove - remove SAS remote PHY
1661 * @rphy: SAS remote phy to remove
1662 *
1663 * Removes the specified SAS remote PHY.
1664 */
1665 void
1666 sas_rphy_remove(struct sas_rphy *rphy)
1667 {
1668 struct device *dev = &rphy->dev;
1669
1670 switch (rphy->identify.device_type) {
1671 case SAS_END_DEVICE:
1672 scsi_remove_target(dev);
1673 break;
1674 case SAS_EDGE_EXPANDER_DEVICE:
1675 case SAS_FANOUT_EXPANDER_DEVICE:
1676 sas_remove_children(dev);
1677 break;
1678 default:
1679 break;
1680 }
1681
1682 sas_rphy_unlink(rphy);
1683 transport_remove_device(dev);
1684 device_del(dev);
1685 }
1686 EXPORT_SYMBOL(sas_rphy_remove);
1687
1688 /**
1689 * scsi_is_sas_rphy - check if a struct device represents a SAS remote PHY
1690 * @dev: device to check
1691 *
1692 * Returns:
1693 * %1 if the device represents a SAS remote PHY, %0 else
1694 */
1695 int scsi_is_sas_rphy(const struct device *dev)
1696 {
1697 return dev->release == sas_end_device_release ||
1698 dev->release == sas_expander_release;
1699 }
1700 EXPORT_SYMBOL(scsi_is_sas_rphy);
1701
1702
1703 /*
1704 * SCSI scan helper
1705 */
1706
1707 static int sas_user_scan(struct Scsi_Host *shost, uint channel,
1708 uint id, uint lun)
1709 {
1710 struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
1711 struct sas_rphy *rphy;
1712
1713 mutex_lock(&sas_host->lock);
1714 list_for_each_entry(rphy, &sas_host->rphy_list, list) {
1715 if (rphy->identify.device_type != SAS_END_DEVICE ||
1716 rphy->scsi_target_id == -1)
1717 continue;
1718
1719 if ((channel == SCAN_WILD_CARD || channel == 0) &&
1720 (id == SCAN_WILD_CARD || id == rphy->scsi_target_id)) {
1721 scsi_scan_target(&rphy->dev, 0,
1722 rphy->scsi_target_id, lun, 1);
1723 }
1724 }
1725 mutex_unlock(&sas_host->lock);
1726
1727 return 0;
1728 }
1729
1730
1731 /*
1732 * Setup / Teardown code
1733 */
1734
1735 #define SETUP_TEMPLATE(attrb, field, perm, test) \
1736 i->private_##attrb[count] = dev_attr_##field; \
1737 i->private_##attrb[count].attr.mode = perm; \
1738 i->attrb[count] = &i->private_##attrb[count]; \
1739 if (test) \
1740 count++
1741
1742 #define SETUP_TEMPLATE_RW(attrb, field, perm, test, ro_test, ro_perm) \
1743 i->private_##attrb[count] = dev_attr_##field; \
1744 i->private_##attrb[count].attr.mode = perm; \
1745 if (ro_test) { \
1746 i->private_##attrb[count].attr.mode = ro_perm; \
1747 i->private_##attrb[count].store = NULL; \
1748 } \
1749 i->attrb[count] = &i->private_##attrb[count]; \
1750 if (test) \
1751 count++
1752
1753 #define SETUP_RPORT_ATTRIBUTE(field) \
1754 SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, 1)
1755
1756 #define SETUP_OPTIONAL_RPORT_ATTRIBUTE(field, func) \
1757 SETUP_TEMPLATE(rphy_attrs, field, S_IRUGO, i->f->func)
1758
1759 #define SETUP_PHY_ATTRIBUTE(field) \
1760 SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, 1)
1761
1762 #define SETUP_PHY_ATTRIBUTE_RW(field) \
1763 SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1, \
1764 !i->f->set_phy_speed, S_IRUGO)
1765
1766 #define SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(field, func) \
1767 SETUP_TEMPLATE_RW(phy_attrs, field, S_IRUGO | S_IWUSR, 1, \
1768 !i->f->func, S_IRUGO)
1769
1770 #define SETUP_PORT_ATTRIBUTE(field) \
1771 SETUP_TEMPLATE(port_attrs, field, S_IRUGO, 1)
1772
1773 #define SETUP_OPTIONAL_PHY_ATTRIBUTE(field, func) \
1774 SETUP_TEMPLATE(phy_attrs, field, S_IRUGO, i->f->func)
1775
1776 #define SETUP_PHY_ATTRIBUTE_WRONLY(field) \
1777 SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, 1)
1778
1779 #define SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(field, func) \
1780 SETUP_TEMPLATE(phy_attrs, field, S_IWUSR, i->f->func)
1781
1782 #define SETUP_END_DEV_ATTRIBUTE(field) \
1783 SETUP_TEMPLATE(end_dev_attrs, field, S_IRUGO, 1)
1784
1785 #define SETUP_EXPANDER_ATTRIBUTE(field) \
1786 SETUP_TEMPLATE(expander_attrs, expander_##field, S_IRUGO, 1)
1787
1788 /**
1789 * sas_attach_transport - instantiate SAS transport template
1790 * @ft: SAS transport class function template
1791 */
1792 struct scsi_transport_template *
1793 sas_attach_transport(struct sas_function_template *ft)
1794 {
1795 struct sas_internal *i;
1796 int count;
1797
1798 i = kzalloc(sizeof(struct sas_internal), GFP_KERNEL);
1799 if (!i)
1800 return NULL;
1801
1802 i->t.user_scan = sas_user_scan;
1803
1804 i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1805 i->t.host_attrs.ac.class = &sas_host_class.class;
1806 i->t.host_attrs.ac.match = sas_host_match;
1807 transport_container_register(&i->t.host_attrs);
1808 i->t.host_size = sizeof(struct sas_host_attrs);
1809
1810 i->phy_attr_cont.ac.class = &sas_phy_class.class;
1811 i->phy_attr_cont.ac.attrs = &i->phy_attrs[0];
1812 i->phy_attr_cont.ac.match = sas_phy_match;
1813 transport_container_register(&i->phy_attr_cont);
1814
1815 i->port_attr_cont.ac.class = &sas_port_class.class;
1816 i->port_attr_cont.ac.attrs = &i->port_attrs[0];
1817 i->port_attr_cont.ac.match = sas_port_match;
1818 transport_container_register(&i->port_attr_cont);
1819
1820 i->rphy_attr_cont.ac.class = &sas_rphy_class.class;
1821 i->rphy_attr_cont.ac.attrs = &i->rphy_attrs[0];
1822 i->rphy_attr_cont.ac.match = sas_rphy_match;
1823 transport_container_register(&i->rphy_attr_cont);
1824
1825 i->end_dev_attr_cont.ac.class = &sas_end_dev_class.class;
1826 i->end_dev_attr_cont.ac.attrs = &i->end_dev_attrs[0];
1827 i->end_dev_attr_cont.ac.match = sas_end_dev_match;
1828 transport_container_register(&i->end_dev_attr_cont);
1829
1830 i->expander_attr_cont.ac.class = &sas_expander_class.class;
1831 i->expander_attr_cont.ac.attrs = &i->expander_attrs[0];
1832 i->expander_attr_cont.ac.match = sas_expander_match;
1833 transport_container_register(&i->expander_attr_cont);
1834
1835 i->f = ft;
1836
1837 count = 0;
1838 SETUP_PHY_ATTRIBUTE(initiator_port_protocols);
1839 SETUP_PHY_ATTRIBUTE(target_port_protocols);
1840 SETUP_PHY_ATTRIBUTE(device_type);
1841 SETUP_PHY_ATTRIBUTE(sas_address);
1842 SETUP_PHY_ATTRIBUTE(phy_identifier);
1843 //SETUP_PHY_ATTRIBUTE(port_identifier);
1844 SETUP_PHY_ATTRIBUTE(negotiated_linkrate);
1845 SETUP_PHY_ATTRIBUTE(minimum_linkrate_hw);
1846 SETUP_PHY_ATTRIBUTE_RW(minimum_linkrate);
1847 SETUP_PHY_ATTRIBUTE(maximum_linkrate_hw);
1848 SETUP_PHY_ATTRIBUTE_RW(maximum_linkrate);
1849
1850 SETUP_PHY_ATTRIBUTE(invalid_dword_count);
1851 SETUP_PHY_ATTRIBUTE(running_disparity_error_count);
1852 SETUP_PHY_ATTRIBUTE(loss_of_dword_sync_count);
1853 SETUP_PHY_ATTRIBUTE(phy_reset_problem_count);
1854 SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(link_reset, phy_reset);
1855 SETUP_OPTIONAL_PHY_ATTRIBUTE_WRONLY(hard_reset, phy_reset);
1856 SETUP_OPTIONAL_PHY_ATTRIBUTE_RW(enable, phy_enable);
1857 i->phy_attrs[count] = NULL;
1858
1859 count = 0;
1860 SETUP_PORT_ATTRIBUTE(num_phys);
1861 i->port_attrs[count] = NULL;
1862
1863 count = 0;
1864 SETUP_RPORT_ATTRIBUTE(rphy_initiator_port_protocols);
1865 SETUP_RPORT_ATTRIBUTE(rphy_target_port_protocols);
1866 SETUP_RPORT_ATTRIBUTE(rphy_device_type);
1867 SETUP_RPORT_ATTRIBUTE(rphy_sas_address);
1868 SETUP_RPORT_ATTRIBUTE(rphy_phy_identifier);
1869 SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_enclosure_identifier,
1870 get_enclosure_identifier);
1871 SETUP_OPTIONAL_RPORT_ATTRIBUTE(rphy_bay_identifier,
1872 get_bay_identifier);
1873 i->rphy_attrs[count] = NULL;
1874
1875 count = 0;
1876 SETUP_END_DEV_ATTRIBUTE(end_dev_ready_led_meaning);
1877 SETUP_END_DEV_ATTRIBUTE(end_dev_I_T_nexus_loss_timeout);
1878 SETUP_END_DEV_ATTRIBUTE(end_dev_initiator_response_timeout);
1879 SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_supported);
1880 SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_enabled);
1881 i->end_dev_attrs[count] = NULL;
1882
1883 count = 0;
1884 SETUP_EXPANDER_ATTRIBUTE(vendor_id);
1885 SETUP_EXPANDER_ATTRIBUTE(product_id);
1886 SETUP_EXPANDER_ATTRIBUTE(product_rev);
1887 SETUP_EXPANDER_ATTRIBUTE(component_vendor_id);
1888 SETUP_EXPANDER_ATTRIBUTE(component_id);
1889 SETUP_EXPANDER_ATTRIBUTE(component_revision_id);
1890 SETUP_EXPANDER_ATTRIBUTE(level);
1891 i->expander_attrs[count] = NULL;
1892
1893 return &i->t;
1894 }
1895 EXPORT_SYMBOL(sas_attach_transport);
1896
1897 /**
1898 * sas_release_transport - release SAS transport template instance
1899 * @t: transport template instance
1900 */
1901 void sas_release_transport(struct scsi_transport_template *t)
1902 {
1903 struct sas_internal *i = to_sas_internal(t);
1904
1905 transport_container_unregister(&i->t.host_attrs);
1906 transport_container_unregister(&i->phy_attr_cont);
1907 transport_container_unregister(&i->port_attr_cont);
1908 transport_container_unregister(&i->rphy_attr_cont);
1909 transport_container_unregister(&i->end_dev_attr_cont);
1910 transport_container_unregister(&i->expander_attr_cont);
1911
1912 kfree(i);
1913 }
1914 EXPORT_SYMBOL(sas_release_transport);
1915
1916 static __init int sas_transport_init(void)
1917 {
1918 int error;
1919
1920 error = transport_class_register(&sas_host_class);
1921 if (error)
1922 goto out;
1923 error = transport_class_register(&sas_phy_class);
1924 if (error)
1925 goto out_unregister_transport;
1926 error = transport_class_register(&sas_port_class);
1927 if (error)
1928 goto out_unregister_phy;
1929 error = transport_class_register(&sas_rphy_class);
1930 if (error)
1931 goto out_unregister_port;
1932 error = transport_class_register(&sas_end_dev_class);
1933 if (error)
1934 goto out_unregister_rphy;
1935 error = transport_class_register(&sas_expander_class);
1936 if (error)
1937 goto out_unregister_end_dev;
1938
1939 return 0;
1940
1941 out_unregister_end_dev:
1942 transport_class_unregister(&sas_end_dev_class);
1943 out_unregister_rphy:
1944 transport_class_unregister(&sas_rphy_class);
1945 out_unregister_port:
1946 transport_class_unregister(&sas_port_class);
1947 out_unregister_phy:
1948 transport_class_unregister(&sas_phy_class);
1949 out_unregister_transport:
1950 transport_class_unregister(&sas_host_class);
1951 out:
1952 return error;
1953
1954 }
1955
1956 static void __exit sas_transport_exit(void)
1957 {
1958 transport_class_unregister(&sas_host_class);
1959 transport_class_unregister(&sas_phy_class);
1960 transport_class_unregister(&sas_port_class);
1961 transport_class_unregister(&sas_rphy_class);
1962 transport_class_unregister(&sas_end_dev_class);
1963 transport_class_unregister(&sas_expander_class);
1964 }
1965
1966 MODULE_AUTHOR("Christoph Hellwig");
1967 MODULE_DESCRIPTION("SAS Transport Attributes");
1968 MODULE_LICENSE("GPL");
1969
1970 module_init(sas_transport_init);
1971 module_exit(sas_transport_exit);
kernel source for telekom puls (alcatel/mediatek)