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

source code of linux/drivers/scsi/scsi_transport_sas.c