[PATCH] libata: if condition fix for ata_dev_identify()
[linux-2.6] / drivers / scsi / scsi_transport_sas.c
1 /*
2  * Copyright (C) 2005 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 managment
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/err.h>
29 #include <linux/slab.h>
30 #include <linux/string.h>
31
32 #include <scsi/scsi_device.h>
33 #include <scsi/scsi_host.h>
34 #include <scsi/scsi_transport.h>
35 #include <scsi/scsi_transport_sas.h>
36
37
38 #define SAS_HOST_ATTRS          0
39 #define SAS_PORT_ATTRS          17
40 #define SAS_RPORT_ATTRS         5
41
42 struct sas_internal {
43         struct scsi_transport_template t;
44         struct sas_function_template *f;
45
46         struct class_device_attribute private_host_attrs[SAS_HOST_ATTRS];
47         struct class_device_attribute private_phy_attrs[SAS_PORT_ATTRS];
48         struct class_device_attribute private_rphy_attrs[SAS_RPORT_ATTRS];
49
50         struct transport_container phy_attr_cont;
51         struct transport_container rphy_attr_cont;
52
53         /*
54          * The array of null terminated pointers to attributes
55          * needed by scsi_sysfs.c
56          */
57         struct class_device_attribute *host_attrs[SAS_HOST_ATTRS + 1];
58         struct class_device_attribute *phy_attrs[SAS_PORT_ATTRS + 1];
59         struct class_device_attribute *rphy_attrs[SAS_RPORT_ATTRS + 1];
60 };
61 #define to_sas_internal(tmpl)   container_of(tmpl, struct sas_internal, t)
62
63 struct sas_host_attrs {
64         struct list_head rphy_list;
65         spinlock_t lock;
66         u32 next_target_id;
67 };
68 #define to_sas_host_attrs(host) ((struct sas_host_attrs *)(host)->shost_data)
69
70
71 /*
72  * Hack to allow attributes of the same name in different objects.
73  */
74 #define SAS_CLASS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
75         struct class_device_attribute class_device_attr_##_prefix##_##_name = \
76         __ATTR(_name,_mode,_show,_store)
77
78
79 /*
80  * Pretty printing helpers
81  */
82
83 #define sas_bitfield_name_match(title, table)                   \
84 static ssize_t                                                  \
85 get_sas_##title##_names(u32 table_key, char *buf)               \
86 {                                                               \
87         char *prefix = "";                                      \
88         ssize_t len = 0;                                        \
89         int i;                                                  \
90                                                                 \
91         for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) {  \
92                 if (table[i].value & table_key) {               \
93                         len += sprintf(buf + len, "%s%s",       \
94                                 prefix, table[i].name);         \
95                         prefix = ", ";                          \
96                 }                                               \
97         }                                                       \
98         len += sprintf(buf + len, "\n");                        \
99         return len;                                             \
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 < sizeof(table)/sizeof(table[0]); 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 };
154 sas_bitfield_name_search(linkspeed, sas_linkspeed_names)
155
156
157 /*
158  * SAS host attributes
159  */
160
161 static int sas_host_setup(struct transport_container *tc, struct device *dev,
162                           struct class_device *cdev)
163 {
164         struct Scsi_Host *shost = dev_to_shost(dev);
165         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
166
167         INIT_LIST_HEAD(&sas_host->rphy_list);
168         spin_lock_init(&sas_host->lock);
169         sas_host->next_target_id = 0;
170         return 0;
171 }
172
173 static DECLARE_TRANSPORT_CLASS(sas_host_class,
174                 "sas_host", sas_host_setup, NULL, NULL);
175
176 static int sas_host_match(struct attribute_container *cont,
177                             struct device *dev)
178 {
179         struct Scsi_Host *shost;
180         struct sas_internal *i;
181
182         if (!scsi_is_host_device(dev))
183                 return 0;
184         shost = dev_to_shost(dev);
185
186         if (!shost->transportt)
187                 return 0;
188         if (shost->transportt->host_attrs.ac.class !=
189                         &sas_host_class.class)
190                 return 0;
191
192         i = to_sas_internal(shost->transportt);
193         return &i->t.host_attrs.ac == cont;
194 }
195
196 static int do_sas_phy_delete(struct device *dev, void *data)
197 {
198         if (scsi_is_sas_phy(dev))
199                 sas_phy_delete(dev_to_phy(dev));
200         return 0;
201 }
202
203 /**
204  * sas_remove_host  --  tear down a Scsi_Host's SAS data structures
205  * @shost:      Scsi Host that is torn down
206  *
207  * Removes all SAS PHYs and remote PHYs for a given Scsi_Host.
208  * Must be called just before scsi_remove_host for SAS HBAs.
209  */
210 void sas_remove_host(struct Scsi_Host *shost)
211 {
212         device_for_each_child(&shost->shost_gendev, NULL, do_sas_phy_delete);
213 }
214 EXPORT_SYMBOL(sas_remove_host);
215
216
217 /*
218  * SAS Port attributes
219  */
220
221 #define sas_phy_show_simple(field, name, format_string, cast)           \
222 static ssize_t                                                          \
223 show_sas_phy_##name(struct class_device *cdev, char *buf)               \
224 {                                                                       \
225         struct sas_phy *phy = transport_class_to_phy(cdev);             \
226                                                                         \
227         return snprintf(buf, 20, format_string, cast phy->field);       \
228 }
229
230 #define sas_phy_simple_attr(field, name, format_string, type)           \
231         sas_phy_show_simple(field, name, format_string, (type)) \
232 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
233
234 #define sas_phy_show_protocol(field, name)                              \
235 static ssize_t                                                          \
236 show_sas_phy_##name(struct class_device *cdev, char *buf)               \
237 {                                                                       \
238         struct sas_phy *phy = transport_class_to_phy(cdev);             \
239                                                                         \
240         if (!phy->field)                                                \
241                 return snprintf(buf, 20, "none\n");                     \
242         return get_sas_protocol_names(phy->field, buf);         \
243 }
244
245 #define sas_phy_protocol_attr(field, name)                              \
246         sas_phy_show_protocol(field, name)                              \
247 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_sas_phy_##name, NULL)
248
249 #define sas_phy_show_linkspeed(field)                                   \
250 static ssize_t                                                          \
251 show_sas_phy_##field(struct class_device *cdev, char *buf)              \
252 {                                                                       \
253         struct sas_phy *phy = transport_class_to_phy(cdev);             \
254                                                                         \
255         return get_sas_linkspeed_names(phy->field, buf);                \
256 }
257
258 #define sas_phy_linkspeed_attr(field)                                   \
259         sas_phy_show_linkspeed(field)                                   \
260 static CLASS_DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
261
262 #define sas_phy_show_linkerror(field)                                   \
263 static ssize_t                                                          \
264 show_sas_phy_##field(struct class_device *cdev, char *buf)              \
265 {                                                                       \
266         struct sas_phy *phy = transport_class_to_phy(cdev);             \
267         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);        \
268         struct sas_internal *i = to_sas_internal(shost->transportt);    \
269         int error;                                                      \
270                                                                         \
271         if (!phy->local_attached)                                       \
272                 return -EINVAL;                                         \
273                                                                         \
274         error = i->f->get_linkerrors(phy);                              \
275         if (error)                                                      \
276                 return error;                                           \
277         return snprintf(buf, 20, "%u\n", phy->field);                   \
278 }
279
280 #define sas_phy_linkerror_attr(field)                                   \
281         sas_phy_show_linkerror(field)                                   \
282 static CLASS_DEVICE_ATTR(field, S_IRUGO, show_sas_phy_##field, NULL)
283
284
285 static ssize_t
286 show_sas_device_type(struct class_device *cdev, char *buf)
287 {
288         struct sas_phy *phy = transport_class_to_phy(cdev);
289
290         if (!phy->identify.device_type)
291                 return snprintf(buf, 20, "none\n");
292         return get_sas_device_type_names(phy->identify.device_type, buf);
293 }
294 static CLASS_DEVICE_ATTR(device_type, S_IRUGO, show_sas_device_type, NULL);
295
296 static ssize_t do_sas_phy_reset(struct class_device *cdev,
297                 size_t count, int hard_reset)
298 {
299         struct sas_phy *phy = transport_class_to_phy(cdev);
300         struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
301         struct sas_internal *i = to_sas_internal(shost->transportt);
302         int error;
303
304         if (!phy->local_attached)
305                 return -EINVAL;
306
307         error = i->f->phy_reset(phy, hard_reset);
308         if (error)
309                 return error;
310         return count;
311 };
312
313 static ssize_t store_sas_link_reset(struct class_device *cdev,
314                 const char *buf, size_t count)
315 {
316         return do_sas_phy_reset(cdev, count, 0);
317 }
318 static CLASS_DEVICE_ATTR(link_reset, S_IWUSR, NULL, store_sas_link_reset);
319
320 static ssize_t store_sas_hard_reset(struct class_device *cdev,
321                 const char *buf, size_t count)
322 {
323         return do_sas_phy_reset(cdev, count, 1);
324 }
325 static CLASS_DEVICE_ATTR(hard_reset, S_IWUSR, NULL, store_sas_hard_reset);
326
327 sas_phy_protocol_attr(identify.initiator_port_protocols,
328                 initiator_port_protocols);
329 sas_phy_protocol_attr(identify.target_port_protocols,
330                 target_port_protocols);
331 sas_phy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
332                 unsigned long long);
333 sas_phy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
334 sas_phy_simple_attr(port_identifier, port_identifier, "%d\n", u8);
335 sas_phy_linkspeed_attr(negotiated_linkrate);
336 sas_phy_linkspeed_attr(minimum_linkrate_hw);
337 sas_phy_linkspeed_attr(minimum_linkrate);
338 sas_phy_linkspeed_attr(maximum_linkrate_hw);
339 sas_phy_linkspeed_attr(maximum_linkrate);
340 sas_phy_linkerror_attr(invalid_dword_count);
341 sas_phy_linkerror_attr(running_disparity_error_count);
342 sas_phy_linkerror_attr(loss_of_dword_sync_count);
343 sas_phy_linkerror_attr(phy_reset_problem_count);
344
345
346 static DECLARE_TRANSPORT_CLASS(sas_phy_class,
347                 "sas_phy", NULL, NULL, NULL);
348
349 static int sas_phy_match(struct attribute_container *cont, struct device *dev)
350 {
351         struct Scsi_Host *shost;
352         struct sas_internal *i;
353
354         if (!scsi_is_sas_phy(dev))
355                 return 0;
356         shost = dev_to_shost(dev->parent);
357
358         if (!shost->transportt)
359                 return 0;
360         if (shost->transportt->host_attrs.ac.class !=
361                         &sas_host_class.class)
362                 return 0;
363
364         i = to_sas_internal(shost->transportt);
365         return &i->phy_attr_cont.ac == cont;
366 }
367
368 static void sas_phy_release(struct device *dev)
369 {
370         struct sas_phy *phy = dev_to_phy(dev);
371
372         put_device(dev->parent);
373         kfree(phy);
374 }
375
376 /**
377  * sas_phy_alloc  --  allocates and initialize a SAS PHY structure
378  * @parent:     Parent device
379  * @number:     Port number
380  *
381  * Allocates an SAS PHY structure.  It will be added in the device tree
382  * below the device specified by @parent, which has to be either a Scsi_Host
383  * or sas_rphy.
384  *
385  * Returns:
386  *      SAS PHY allocated or %NULL if the allocation failed.
387  */
388 struct sas_phy *sas_phy_alloc(struct device *parent, int number)
389 {
390         struct Scsi_Host *shost = dev_to_shost(parent);
391         struct sas_phy *phy;
392
393         phy = kmalloc(sizeof(*phy), GFP_KERNEL);
394         if (!phy)
395                 return NULL;
396         memset(phy, 0, sizeof(*phy));
397
398         get_device(parent);
399
400         phy->number = number;
401
402         device_initialize(&phy->dev);
403         phy->dev.parent = get_device(parent);
404         phy->dev.release = sas_phy_release;
405         sprintf(phy->dev.bus_id, "phy-%d:%d", shost->host_no, number);
406
407         transport_setup_device(&phy->dev);
408
409         return phy;
410 }
411 EXPORT_SYMBOL(sas_phy_alloc);
412
413 /**
414  * sas_phy_add  --  add a SAS PHY to the device hierachy
415  * @phy:        The PHY to be added
416  *
417  * Publishes a SAS PHY to the rest of the system.
418  */
419 int sas_phy_add(struct sas_phy *phy)
420 {
421         int error;
422
423         error = device_add(&phy->dev);
424         if (!error) {
425                 transport_add_device(&phy->dev);
426                 transport_configure_device(&phy->dev);
427         }
428
429         return error;
430 }
431 EXPORT_SYMBOL(sas_phy_add);
432
433 /**
434  * sas_phy_free  --  free a SAS PHY
435  * @phy:        SAS PHY to free
436  *
437  * Frees the specified SAS PHY.
438  *
439  * Note:
440  *   This function must only be called on a PHY that has not
441  *   sucessfully been added using sas_phy_add().
442  */
443 void sas_phy_free(struct sas_phy *phy)
444 {
445         transport_destroy_device(&phy->dev);
446         put_device(phy->dev.parent);
447         put_device(phy->dev.parent);
448         put_device(phy->dev.parent);
449         kfree(phy);
450 }
451 EXPORT_SYMBOL(sas_phy_free);
452
453 /**
454  * sas_phy_delete  --  remove SAS PHY
455  * @phy:        SAS PHY to remove
456  *
457  * Removes the specified SAS PHY.  If the SAS PHY has an
458  * associated remote PHY it is removed before.
459  */
460 void
461 sas_phy_delete(struct sas_phy *phy)
462 {
463         struct device *dev = &phy->dev;
464
465         if (phy->rphy)
466                 sas_rphy_delete(phy->rphy);
467
468         transport_remove_device(dev);
469         device_del(dev);
470         transport_destroy_device(dev);
471         put_device(dev->parent);
472 }
473 EXPORT_SYMBOL(sas_phy_delete);
474
475 /**
476  * scsi_is_sas_phy  --  check if a struct device represents a SAS PHY
477  * @dev:        device to check
478  *
479  * Returns:
480  *      %1 if the device represents a SAS PHY, %0 else
481  */
482 int scsi_is_sas_phy(const struct device *dev)
483 {
484         return dev->release == sas_phy_release;
485 }
486 EXPORT_SYMBOL(scsi_is_sas_phy);
487
488 /*
489  * SAS remote PHY attributes.
490  */
491
492 #define sas_rphy_show_simple(field, name, format_string, cast)          \
493 static ssize_t                                                          \
494 show_sas_rphy_##name(struct class_device *cdev, char *buf)              \
495 {                                                                       \
496         struct sas_rphy *rphy = transport_class_to_rphy(cdev);  \
497                                                                         \
498         return snprintf(buf, 20, format_string, cast rphy->field);      \
499 }
500
501 #define sas_rphy_simple_attr(field, name, format_string, type)          \
502         sas_rphy_show_simple(field, name, format_string, (type))        \
503 static SAS_CLASS_DEVICE_ATTR(rphy, name, S_IRUGO,                       \
504                 show_sas_rphy_##name, NULL)
505
506 #define sas_rphy_show_protocol(field, name)                             \
507 static ssize_t                                                          \
508 show_sas_rphy_##name(struct class_device *cdev, char *buf)              \
509 {                                                                       \
510         struct sas_rphy *rphy = transport_class_to_rphy(cdev);  \
511                                                                         \
512         if (!rphy->field)                                       \
513                 return snprintf(buf, 20, "none\n");                     \
514         return get_sas_protocol_names(rphy->field, buf);        \
515 }
516
517 #define sas_rphy_protocol_attr(field, name)                             \
518         sas_rphy_show_protocol(field, name)                             \
519 static SAS_CLASS_DEVICE_ATTR(rphy, name, S_IRUGO,                       \
520                 show_sas_rphy_##name, NULL)
521
522 static ssize_t
523 show_sas_rphy_device_type(struct class_device *cdev, char *buf)
524 {
525         struct sas_rphy *rphy = transport_class_to_rphy(cdev);
526
527         if (!rphy->identify.device_type)
528                 return snprintf(buf, 20, "none\n");
529         return get_sas_device_type_names(
530                         rphy->identify.device_type, buf);
531 }
532
533 static SAS_CLASS_DEVICE_ATTR(rphy, device_type, S_IRUGO,
534                 show_sas_rphy_device_type, NULL);
535
536 sas_rphy_protocol_attr(identify.initiator_port_protocols,
537                 initiator_port_protocols);
538 sas_rphy_protocol_attr(identify.target_port_protocols, target_port_protocols);
539 sas_rphy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
540                 unsigned long long);
541 sas_rphy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
542
543 static DECLARE_TRANSPORT_CLASS(sas_rphy_class,
544                 "sas_rphy", NULL, NULL, NULL);
545
546 static int sas_rphy_match(struct attribute_container *cont, struct device *dev)
547 {
548         struct Scsi_Host *shost;
549         struct sas_internal *i;
550
551         if (!scsi_is_sas_rphy(dev))
552                 return 0;
553         shost = dev_to_shost(dev->parent->parent);
554
555         if (!shost->transportt)
556                 return 0;
557         if (shost->transportt->host_attrs.ac.class !=
558                         &sas_host_class.class)
559                 return 0;
560
561         i = to_sas_internal(shost->transportt);
562         return &i->rphy_attr_cont.ac == cont;
563 }
564
565 static void sas_rphy_release(struct device *dev)
566 {
567         struct sas_rphy *rphy = dev_to_rphy(dev);
568
569         put_device(dev->parent);
570         kfree(rphy);
571 }
572
573 /**
574  * sas_rphy_alloc  --  allocates and initialize a SAS remote PHY structure
575  * @parent:             SAS PHY this remote PHY is conneted to
576  *
577  * Allocates an SAS remote PHY structure, connected to @parent.
578  *
579  * Returns:
580  *      SAS PHY allocated or %NULL if the allocation failed.
581  */
582 struct sas_rphy *sas_rphy_alloc(struct sas_phy *parent)
583 {
584         struct Scsi_Host *shost = dev_to_shost(&parent->dev);
585         struct sas_rphy *rphy;
586
587         rphy = kmalloc(sizeof(*rphy), GFP_KERNEL);
588         if (!rphy) {
589                 put_device(&parent->dev);
590                 return NULL;
591         }
592         memset(rphy, 0, sizeof(*rphy));
593
594         device_initialize(&rphy->dev);
595         rphy->dev.parent = get_device(&parent->dev);
596         rphy->dev.release = sas_rphy_release;
597         sprintf(rphy->dev.bus_id, "rphy-%d:%d",
598                 shost->host_no, parent->number);
599         transport_setup_device(&rphy->dev);
600
601         return rphy;
602 }
603 EXPORT_SYMBOL(sas_rphy_alloc);
604
605 /**
606  * sas_rphy_add  --  add a SAS remote PHY to the device hierachy
607  * @rphy:       The remote PHY to be added
608  *
609  * Publishes a SAS remote PHY to the rest of the system.
610  */
611 int sas_rphy_add(struct sas_rphy *rphy)
612 {
613         struct sas_phy *parent = dev_to_phy(rphy->dev.parent);
614         struct Scsi_Host *shost = dev_to_shost(parent->dev.parent);
615         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
616         struct sas_identify *identify = &rphy->identify;
617         int error;
618
619         if (parent->rphy)
620                 return -ENXIO;
621         parent->rphy = rphy;
622
623         error = device_add(&rphy->dev);
624         if (error)
625                 return error;
626         transport_add_device(&rphy->dev);
627         transport_configure_device(&rphy->dev);
628
629         spin_lock(&sas_host->lock);
630         list_add_tail(&rphy->list, &sas_host->rphy_list);
631         if (identify->device_type == SAS_END_DEVICE &&
632             (identify->target_port_protocols &
633              (SAS_PROTOCOL_SSP|SAS_PROTOCOL_STP|SAS_PROTOCOL_SATA)))
634                 rphy->scsi_target_id = sas_host->next_target_id++;
635         else
636                 rphy->scsi_target_id = -1;
637         spin_unlock(&sas_host->lock);
638
639         if (rphy->scsi_target_id != -1) {
640                 scsi_scan_target(&rphy->dev, parent->number,
641                                 rphy->scsi_target_id, ~0, 0);
642         }
643
644         return 0;
645 }
646 EXPORT_SYMBOL(sas_rphy_add);
647
648 /**
649  * sas_rphy_free  --  free a SAS remote PHY
650  * @rphy        SAS remote PHY to free
651  *
652  * Frees the specified SAS remote PHY.
653  *
654  * Note:
655  *   This function must only be called on a remote
656  *   PHY that has not sucessfully been added using
657  *   sas_rphy_add().
658  */
659 void sas_rphy_free(struct sas_rphy *rphy)
660 {
661         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent->parent);
662         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
663
664         spin_lock(&sas_host->lock);
665         list_del(&rphy->list);
666         spin_unlock(&sas_host->lock);
667
668         transport_destroy_device(&rphy->dev);
669         put_device(rphy->dev.parent);
670         put_device(rphy->dev.parent);
671         put_device(rphy->dev.parent);
672         kfree(rphy);
673 }
674 EXPORT_SYMBOL(sas_rphy_free);
675
676 /**
677  * sas_rphy_delete  --  remove SAS remote PHY
678  * @rphy:       SAS remote PHY to remove
679  *
680  * Removes the specified SAS remote PHY.
681  */
682 void
683 sas_rphy_delete(struct sas_rphy *rphy)
684 {
685         struct device *dev = &rphy->dev;
686         struct sas_phy *parent = dev_to_phy(dev->parent);
687         struct Scsi_Host *shost = dev_to_shost(parent->dev.parent);
688         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
689
690         scsi_remove_target(dev);
691
692         transport_remove_device(dev);
693         device_del(dev);
694         transport_destroy_device(dev);
695
696         spin_lock(&sas_host->lock);
697         list_del(&rphy->list);
698         spin_unlock(&sas_host->lock);
699
700         put_device(&parent->dev);
701 }
702 EXPORT_SYMBOL(sas_rphy_delete);
703
704 /**
705  * scsi_is_sas_rphy  --  check if a struct device represents a SAS remote PHY
706  * @dev:        device to check
707  *
708  * Returns:
709  *      %1 if the device represents a SAS remote PHY, %0 else
710  */
711 int scsi_is_sas_rphy(const struct device *dev)
712 {
713         return dev->release == sas_rphy_release;
714 }
715 EXPORT_SYMBOL(scsi_is_sas_rphy);
716
717
718 /*
719  * SCSI scan helper
720  */
721
722 static struct device *sas_target_parent(struct Scsi_Host *shost,
723                                         int channel, uint id)
724 {
725         struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
726         struct sas_rphy *rphy;
727         struct device *dev = NULL;
728
729         spin_lock(&sas_host->lock);
730         list_for_each_entry(rphy, &sas_host->rphy_list, list) {
731                 struct sas_phy *parent = dev_to_phy(rphy->dev.parent);
732                 if (parent->number == channel &&
733                     rphy->scsi_target_id == id)
734                         dev = &rphy->dev;
735         }
736         spin_unlock(&sas_host->lock);
737
738         return dev;
739 }
740
741
742 /*
743  * Setup / Teardown code
744  */
745
746 #define SETUP_RPORT_ATTRIBUTE(field)                                    \
747         i->private_rphy_attrs[count] = class_device_attr_##field;       \
748         i->private_rphy_attrs[count].attr.mode = S_IRUGO;               \
749         i->private_rphy_attrs[count].store = NULL;                      \
750         i->rphy_attrs[count] = &i->private_rphy_attrs[count];   \
751         count++
752
753 #define SETUP_PORT_ATTRIBUTE(field)                                     \
754         i->private_phy_attrs[count] = class_device_attr_##field;        \
755         i->private_phy_attrs[count].attr.mode = S_IRUGO;                \
756         i->private_phy_attrs[count].store = NULL;                       \
757         i->phy_attrs[count] = &i->private_phy_attrs[count];             \
758         count++
759
760 #define SETUP_PORT_ATTRIBUTE_WRONLY(field)                              \
761         i->private_phy_attrs[count] = class_device_attr_##field;        \
762         i->private_phy_attrs[count].attr.mode = S_IWUGO;                \
763         i->private_phy_attrs[count].show = NULL;                        \
764         i->phy_attrs[count] = &i->private_phy_attrs[count];             \
765         count++
766
767
768 /**
769  * sas_attach_transport  --  instantiate SAS transport template
770  * @ft:         SAS transport class function template
771  */
772 struct scsi_transport_template *
773 sas_attach_transport(struct sas_function_template *ft)
774 {
775         struct sas_internal *i;
776         int count;
777
778         i = kmalloc(sizeof(struct sas_internal), GFP_KERNEL);
779         if (!i)
780                 return NULL;
781         memset(i, 0, sizeof(struct sas_internal));
782
783         i->t.target_parent = sas_target_parent;
784
785         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
786         i->t.host_attrs.ac.class = &sas_host_class.class;
787         i->t.host_attrs.ac.match = sas_host_match;
788         transport_container_register(&i->t.host_attrs);
789         i->t.host_size = sizeof(struct sas_host_attrs);
790
791         i->phy_attr_cont.ac.class = &sas_phy_class.class;
792         i->phy_attr_cont.ac.attrs = &i->phy_attrs[0];
793         i->phy_attr_cont.ac.match = sas_phy_match;
794         transport_container_register(&i->phy_attr_cont);
795
796         i->rphy_attr_cont.ac.class = &sas_rphy_class.class;
797         i->rphy_attr_cont.ac.attrs = &i->rphy_attrs[0];
798         i->rphy_attr_cont.ac.match = sas_rphy_match;
799         transport_container_register(&i->rphy_attr_cont);
800
801         i->f = ft;
802
803         count = 0;
804         i->host_attrs[count] = NULL;
805
806         count = 0;
807         SETUP_PORT_ATTRIBUTE(initiator_port_protocols);
808         SETUP_PORT_ATTRIBUTE(target_port_protocols);
809         SETUP_PORT_ATTRIBUTE(device_type);
810         SETUP_PORT_ATTRIBUTE(sas_address);
811         SETUP_PORT_ATTRIBUTE(phy_identifier);
812         SETUP_PORT_ATTRIBUTE(port_identifier);
813         SETUP_PORT_ATTRIBUTE(negotiated_linkrate);
814         SETUP_PORT_ATTRIBUTE(minimum_linkrate_hw);
815         SETUP_PORT_ATTRIBUTE(minimum_linkrate);
816         SETUP_PORT_ATTRIBUTE(maximum_linkrate_hw);
817         SETUP_PORT_ATTRIBUTE(maximum_linkrate);
818
819         SETUP_PORT_ATTRIBUTE(invalid_dword_count);
820         SETUP_PORT_ATTRIBUTE(running_disparity_error_count);
821         SETUP_PORT_ATTRIBUTE(loss_of_dword_sync_count);
822         SETUP_PORT_ATTRIBUTE(phy_reset_problem_count);
823         SETUP_PORT_ATTRIBUTE_WRONLY(link_reset);
824         SETUP_PORT_ATTRIBUTE_WRONLY(hard_reset);
825         i->phy_attrs[count] = NULL;
826
827         count = 0;
828         SETUP_RPORT_ATTRIBUTE(rphy_initiator_port_protocols);
829         SETUP_RPORT_ATTRIBUTE(rphy_target_port_protocols);
830         SETUP_RPORT_ATTRIBUTE(rphy_device_type);
831         SETUP_RPORT_ATTRIBUTE(rphy_sas_address);
832         SETUP_RPORT_ATTRIBUTE(rphy_phy_identifier);
833         i->rphy_attrs[count] = NULL;
834
835         return &i->t;
836 }
837 EXPORT_SYMBOL(sas_attach_transport);
838
839 /**
840  * sas_release_transport  --  release SAS transport template instance
841  * @t:          transport template instance
842  */
843 void sas_release_transport(struct scsi_transport_template *t)
844 {
845         struct sas_internal *i = to_sas_internal(t);
846
847         transport_container_unregister(&i->t.host_attrs);
848         transport_container_unregister(&i->phy_attr_cont);
849         transport_container_unregister(&i->rphy_attr_cont);
850
851         kfree(i);
852 }
853 EXPORT_SYMBOL(sas_release_transport);
854
855 static __init int sas_transport_init(void)
856 {
857         int error;
858
859         error = transport_class_register(&sas_host_class);
860         if (error)
861                 goto out;
862         error = transport_class_register(&sas_phy_class);
863         if (error)
864                 goto out_unregister_transport;
865         error = transport_class_register(&sas_rphy_class);
866         if (error)
867                 goto out_unregister_phy;
868
869         return 0;
870
871  out_unregister_phy:
872         transport_class_unregister(&sas_phy_class);
873  out_unregister_transport:
874         transport_class_unregister(&sas_host_class);
875  out:
876         return error;
877
878 }
879
880 static void __exit sas_transport_exit(void)
881 {
882         transport_class_unregister(&sas_host_class);
883         transport_class_unregister(&sas_phy_class);
884         transport_class_unregister(&sas_rphy_class);
885 }
886
887 MODULE_AUTHOR("Christoph Hellwig");
888 MODULE_DESCRIPTION("SAS Transphy Attributes");
889 MODULE_LICENSE("GPL");
890
891 module_init(sas_transport_init);
892 module_exit(sas_transport_exit);