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Merge tag 'for-v3.11' of git://git.infradead.org/battery-2.6
[deliverable/linux.git] / drivers / ata / libata-transport.c
1 /*
2 * Copyright 2008 ioogle, Inc. All rights reserved.
3 * Released under GPL v2.
4 *
5 * Libata transport class.
6 *
7 * The ATA transport class contains common code to deal with ATA HBAs,
8 * an approximated representation of ATA topologies in the driver model,
9 * and various sysfs attributes to expose these topologies and management
10 * interfaces to user-space.
11 *
12 * There are 3 objects defined in in this class:
13 * - ata_port
14 * - ata_link
15 * - ata_device
16 * Each port has a link object. Each link can have up to two devices for PATA
17 * and generally one for SATA.
18 * If there is SATA port multiplier [PMP], 15 additional ata_link object are
19 * created.
20 *
21 * These objects are created when the ata host is initialized and when a PMP is
22 * found. They are removed only when the HBA is removed, cleaned before the
23 * error handler runs.
24 */
25
26
27 #include <linux/kernel.h>
28 #include <linux/blkdev.h>
29 #include <linux/spinlock.h>
30 #include <linux/slab.h>
31 #include <scsi/scsi_transport.h>
32 #include <linux/libata.h>
33 #include <linux/hdreg.h>
34 #include <linux/uaccess.h>
35 #include <linux/pm_runtime.h>
36
37 #include "libata.h"
38 #include "libata-transport.h"
39
40 #define ATA_PORT_ATTRS 3
41 #define ATA_LINK_ATTRS 3
42 #define ATA_DEV_ATTRS 9
43
44 struct scsi_transport_template;
45 struct scsi_transport_template *ata_scsi_transport_template;
46
47 struct ata_internal {
48 struct scsi_transport_template t;
49
50 struct device_attribute private_port_attrs[ATA_PORT_ATTRS];
51 struct device_attribute private_link_attrs[ATA_LINK_ATTRS];
52 struct device_attribute private_dev_attrs[ATA_DEV_ATTRS];
53
54 struct transport_container link_attr_cont;
55 struct transport_container dev_attr_cont;
56
57 /*
58 * The array of null terminated pointers to attributes
59 * needed by scsi_sysfs.c
60 */
61 struct device_attribute *link_attrs[ATA_LINK_ATTRS + 1];
62 struct device_attribute *port_attrs[ATA_PORT_ATTRS + 1];
63 struct device_attribute *dev_attrs[ATA_DEV_ATTRS + 1];
64 };
65 #define to_ata_internal(tmpl) container_of(tmpl, struct ata_internal, t)
66
67
68 #define tdev_to_device(d) \
69 container_of((d), struct ata_device, tdev)
70 #define transport_class_to_dev(dev) \
71 tdev_to_device((dev)->parent)
72
73 #define tdev_to_link(d) \
74 container_of((d), struct ata_link, tdev)
75 #define transport_class_to_link(dev) \
76 tdev_to_link((dev)->parent)
77
78 #define tdev_to_port(d) \
79 container_of((d), struct ata_port, tdev)
80 #define transport_class_to_port(dev) \
81 tdev_to_port((dev)->parent)
82
83
84 /* Device objects are always created whit link objects */
85 static int ata_tdev_add(struct ata_device *dev);
86 static void ata_tdev_delete(struct ata_device *dev);
87
88
89 /*
90 * Hack to allow attributes of the same name in different objects.
91 */
92 #define ATA_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
93 struct device_attribute device_attr_##_prefix##_##_name = \
94 __ATTR(_name,_mode,_show,_store)
95
96 #define ata_bitfield_name_match(title, table) \
97 static ssize_t \
98 get_ata_##title##_names(u32 table_key, char *buf) \
99 { \
100 char *prefix = ""; \
101 ssize_t len = 0; \
102 int i; \
103 \
104 for (i = 0; i < ARRAY_SIZE(table); i++) { \
105 if (table[i].value & table_key) { \
106 len += sprintf(buf + len, "%s%s", \
107 prefix, table[i].name); \
108 prefix = ", "; \
109 } \
110 } \
111 len += sprintf(buf + len, "\n"); \
112 return len; \
113 }
114
115 #define ata_bitfield_name_search(title, table) \
116 static ssize_t \
117 get_ata_##title##_names(u32 table_key, char *buf) \
118 { \
119 ssize_t len = 0; \
120 int i; \
121 \
122 for (i = 0; i < ARRAY_SIZE(table); i++) { \
123 if (table[i].value == table_key) { \
124 len += sprintf(buf + len, "%s", \
125 table[i].name); \
126 break; \
127 } \
128 } \
129 len += sprintf(buf + len, "\n"); \
130 return len; \
131 }
132
133 static struct {
134 u32 value;
135 char *name;
136 } ata_class_names[] = {
137 { ATA_DEV_UNKNOWN, "unknown" },
138 { ATA_DEV_ATA, "ata" },
139 { ATA_DEV_ATA_UNSUP, "ata" },
140 { ATA_DEV_ATAPI, "atapi" },
141 { ATA_DEV_ATAPI_UNSUP, "atapi" },
142 { ATA_DEV_PMP, "pmp" },
143 { ATA_DEV_PMP_UNSUP, "pmp" },
144 { ATA_DEV_SEMB, "semb" },
145 { ATA_DEV_SEMB_UNSUP, "semb" },
146 { ATA_DEV_NONE, "none" }
147 };
148 ata_bitfield_name_search(class, ata_class_names)
149
150
151 static struct {
152 u32 value;
153 char *name;
154 } ata_err_names[] = {
155 { AC_ERR_DEV, "DeviceError" },
156 { AC_ERR_HSM, "HostStateMachineError" },
157 { AC_ERR_TIMEOUT, "Timeout" },
158 { AC_ERR_MEDIA, "MediaError" },
159 { AC_ERR_ATA_BUS, "BusError" },
160 { AC_ERR_HOST_BUS, "HostBusError" },
161 { AC_ERR_SYSTEM, "SystemError" },
162 { AC_ERR_INVALID, "InvalidArg" },
163 { AC_ERR_OTHER, "Unknown" },
164 { AC_ERR_NODEV_HINT, "NoDeviceHint" },
165 { AC_ERR_NCQ, "NCQError" }
166 };
167 ata_bitfield_name_match(err, ata_err_names)
168
169 static struct {
170 u32 value;
171 char *name;
172 } ata_xfer_names[] = {
173 { XFER_UDMA_7, "XFER_UDMA_7" },
174 { XFER_UDMA_6, "XFER_UDMA_6" },
175 { XFER_UDMA_5, "XFER_UDMA_5" },
176 { XFER_UDMA_4, "XFER_UDMA_4" },
177 { XFER_UDMA_3, "XFER_UDMA_3" },
178 { XFER_UDMA_2, "XFER_UDMA_2" },
179 { XFER_UDMA_1, "XFER_UDMA_1" },
180 { XFER_UDMA_0, "XFER_UDMA_0" },
181 { XFER_MW_DMA_4, "XFER_MW_DMA_4" },
182 { XFER_MW_DMA_3, "XFER_MW_DMA_3" },
183 { XFER_MW_DMA_2, "XFER_MW_DMA_2" },
184 { XFER_MW_DMA_1, "XFER_MW_DMA_1" },
185 { XFER_MW_DMA_0, "XFER_MW_DMA_0" },
186 { XFER_SW_DMA_2, "XFER_SW_DMA_2" },
187 { XFER_SW_DMA_1, "XFER_SW_DMA_1" },
188 { XFER_SW_DMA_0, "XFER_SW_DMA_0" },
189 { XFER_PIO_6, "XFER_PIO_6" },
190 { XFER_PIO_5, "XFER_PIO_5" },
191 { XFER_PIO_4, "XFER_PIO_4" },
192 { XFER_PIO_3, "XFER_PIO_3" },
193 { XFER_PIO_2, "XFER_PIO_2" },
194 { XFER_PIO_1, "XFER_PIO_1" },
195 { XFER_PIO_0, "XFER_PIO_0" },
196 { XFER_PIO_SLOW, "XFER_PIO_SLOW" }
197 };
198 ata_bitfield_name_match(xfer,ata_xfer_names)
199
200 /*
201 * ATA Port attributes
202 */
203 #define ata_port_show_simple(field, name, format_string, cast) \
204 static ssize_t \
205 show_ata_port_##name(struct device *dev, \
206 struct device_attribute *attr, char *buf) \
207 { \
208 struct ata_port *ap = transport_class_to_port(dev); \
209 \
210 return snprintf(buf, 20, format_string, cast ap->field); \
211 }
212
213 #define ata_port_simple_attr(field, name, format_string, type) \
214 ata_port_show_simple(field, name, format_string, (type)) \
215 static DEVICE_ATTR(name, S_IRUGO, show_ata_port_##name, NULL)
216
217 ata_port_simple_attr(nr_pmp_links, nr_pmp_links, "%d\n", int);
218 ata_port_simple_attr(stats.idle_irq, idle_irq, "%ld\n", unsigned long);
219 ata_port_simple_attr(local_port_no, port_no, "%u\n", unsigned int);
220
221 static DECLARE_TRANSPORT_CLASS(ata_port_class,
222 "ata_port", NULL, NULL, NULL);
223
224 static void ata_tport_release(struct device *dev)
225 {
226 put_device(dev->parent);
227 }
228
229 /**
230 * ata_is_port -- check if a struct device represents a ATA port
231 * @dev: device to check
232 *
233 * Returns:
234 * %1 if the device represents a ATA Port, %0 else
235 */
236 static int ata_is_port(const struct device *dev)
237 {
238 return dev->release == ata_tport_release;
239 }
240
241 static int ata_tport_match(struct attribute_container *cont,
242 struct device *dev)
243 {
244 if (!ata_is_port(dev))
245 return 0;
246 return &ata_scsi_transport_template->host_attrs.ac == cont;
247 }
248
249 /**
250 * ata_tport_delete -- remove ATA PORT
251 * @port: ATA PORT to remove
252 *
253 * Removes the specified ATA PORT. Remove the associated link as well.
254 */
255 void ata_tport_delete(struct ata_port *ap)
256 {
257 struct device *dev = &ap->tdev;
258
259 ata_tlink_delete(&ap->link);
260
261 transport_remove_device(dev);
262 device_del(dev);
263 transport_destroy_device(dev);
264 put_device(dev);
265 }
266
267 /** ata_tport_add - initialize a transport ATA port structure
268 *
269 * @parent: parent device
270 * @ap: existing ata_port structure
271 *
272 * Initialize a ATA port structure for sysfs. It will be added to the device
273 * tree below the device specified by @parent which could be a PCI device.
274 *
275 * Returns %0 on success
276 */
277 int ata_tport_add(struct device *parent,
278 struct ata_port *ap)
279 {
280 int error;
281 struct device *dev = &ap->tdev;
282
283 device_initialize(dev);
284 dev->type = &ata_port_type;
285
286 dev->parent = get_device(parent);
287 dev->release = ata_tport_release;
288 dev_set_name(dev, "ata%d", ap->print_id);
289 transport_setup_device(dev);
290 error = device_add(dev);
291 if (error) {
292 goto tport_err;
293 }
294
295 device_enable_async_suspend(dev);
296 pm_runtime_set_active(dev);
297 pm_runtime_enable(dev);
298 pm_runtime_forbid(dev);
299
300 transport_add_device(dev);
301 transport_configure_device(dev);
302
303 error = ata_tlink_add(&ap->link);
304 if (error) {
305 goto tport_link_err;
306 }
307 return 0;
308
309 tport_link_err:
310 transport_remove_device(dev);
311 device_del(dev);
312
313 tport_err:
314 transport_destroy_device(dev);
315 put_device(dev);
316 return error;
317 }
318
319
320 /*
321 * ATA link attributes
322 */
323
324
325 #define ata_link_show_linkspeed(field) \
326 static ssize_t \
327 show_ata_link_##field(struct device *dev, \
328 struct device_attribute *attr, char *buf) \
329 { \
330 struct ata_link *link = transport_class_to_link(dev); \
331 \
332 return sprintf(buf,"%s\n", sata_spd_string(fls(link->field))); \
333 }
334
335 #define ata_link_linkspeed_attr(field) \
336 ata_link_show_linkspeed(field) \
337 static DEVICE_ATTR(field, S_IRUGO, show_ata_link_##field, NULL)
338
339 ata_link_linkspeed_attr(hw_sata_spd_limit);
340 ata_link_linkspeed_attr(sata_spd_limit);
341 ata_link_linkspeed_attr(sata_spd);
342
343
344 static DECLARE_TRANSPORT_CLASS(ata_link_class,
345 "ata_link", NULL, NULL, NULL);
346
347 static void ata_tlink_release(struct device *dev)
348 {
349 put_device(dev->parent);
350 }
351
352 /**
353 * ata_is_link -- check if a struct device represents a ATA link
354 * @dev: device to check
355 *
356 * Returns:
357 * %1 if the device represents a ATA link, %0 else
358 */
359 static int ata_is_link(const struct device *dev)
360 {
361 return dev->release == ata_tlink_release;
362 }
363
364 static int ata_tlink_match(struct attribute_container *cont,
365 struct device *dev)
366 {
367 struct ata_internal* i = to_ata_internal(ata_scsi_transport_template);
368 if (!ata_is_link(dev))
369 return 0;
370 return &i->link_attr_cont.ac == cont;
371 }
372
373 /**
374 * ata_tlink_delete -- remove ATA LINK
375 * @port: ATA LINK to remove
376 *
377 * Removes the specified ATA LINK. remove associated ATA device(s) as well.
378 */
379 void ata_tlink_delete(struct ata_link *link)
380 {
381 struct device *dev = &link->tdev;
382 struct ata_device *ata_dev;
383
384 ata_for_each_dev(ata_dev, link, ALL) {
385 ata_tdev_delete(ata_dev);
386 }
387
388 transport_remove_device(dev);
389 device_del(dev);
390 transport_destroy_device(dev);
391 put_device(dev);
392 }
393
394 /**
395 * ata_tlink_add -- initialize a transport ATA link structure
396 * @link: allocated ata_link structure.
397 *
398 * Initialize an ATA LINK structure for sysfs. It will be added in the
399 * device tree below the ATA PORT it belongs to.
400 *
401 * Returns %0 on success
402 */
403 int ata_tlink_add(struct ata_link *link)
404 {
405 struct device *dev = &link->tdev;
406 struct ata_port *ap = link->ap;
407 struct ata_device *ata_dev;
408 int error;
409
410 device_initialize(dev);
411 dev->parent = get_device(&ap->tdev);
412 dev->release = ata_tlink_release;
413 if (ata_is_host_link(link))
414 dev_set_name(dev, "link%d", ap->print_id);
415 else
416 dev_set_name(dev, "link%d.%d", ap->print_id, link->pmp);
417
418 transport_setup_device(dev);
419
420 error = device_add(dev);
421 if (error) {
422 goto tlink_err;
423 }
424
425 transport_add_device(dev);
426 transport_configure_device(dev);
427
428 ata_for_each_dev(ata_dev, link, ALL) {
429 error = ata_tdev_add(ata_dev);
430 if (error) {
431 goto tlink_dev_err;
432 }
433 }
434 return 0;
435 tlink_dev_err:
436 while (--ata_dev >= link->device) {
437 ata_tdev_delete(ata_dev);
438 }
439 transport_remove_device(dev);
440 device_del(dev);
441 tlink_err:
442 transport_destroy_device(dev);
443 put_device(dev);
444 return error;
445 }
446
447 /*
448 * ATA device attributes
449 */
450
451 #define ata_dev_show_class(title, field) \
452 static ssize_t \
453 show_ata_dev_##field(struct device *dev, \
454 struct device_attribute *attr, char *buf) \
455 { \
456 struct ata_device *ata_dev = transport_class_to_dev(dev); \
457 \
458 return get_ata_##title##_names(ata_dev->field, buf); \
459 }
460
461 #define ata_dev_attr(title, field) \
462 ata_dev_show_class(title, field) \
463 static DEVICE_ATTR(field, S_IRUGO, show_ata_dev_##field, NULL)
464
465 ata_dev_attr(class, class);
466 ata_dev_attr(xfer, pio_mode);
467 ata_dev_attr(xfer, dma_mode);
468 ata_dev_attr(xfer, xfer_mode);
469
470
471 #define ata_dev_show_simple(field, format_string, cast) \
472 static ssize_t \
473 show_ata_dev_##field(struct device *dev, \
474 struct device_attribute *attr, char *buf) \
475 { \
476 struct ata_device *ata_dev = transport_class_to_dev(dev); \
477 \
478 return snprintf(buf, 20, format_string, cast ata_dev->field); \
479 }
480
481 #define ata_dev_simple_attr(field, format_string, type) \
482 ata_dev_show_simple(field, format_string, (type)) \
483 static DEVICE_ATTR(field, S_IRUGO, \
484 show_ata_dev_##field, NULL)
485
486 ata_dev_simple_attr(spdn_cnt, "%d\n", int);
487
488 struct ata_show_ering_arg {
489 char* buf;
490 int written;
491 };
492
493 static int ata_show_ering(struct ata_ering_entry *ent, void *void_arg)
494 {
495 struct ata_show_ering_arg* arg = void_arg;
496 struct timespec time;
497
498 jiffies_to_timespec(ent->timestamp,&time);
499 arg->written += sprintf(arg->buf + arg->written,
500 "[%5lu.%06lu]",
501 time.tv_sec, time.tv_nsec);
502 arg->written += get_ata_err_names(ent->err_mask,
503 arg->buf + arg->written);
504 return 0;
505 }
506
507 static ssize_t
508 show_ata_dev_ering(struct device *dev,
509 struct device_attribute *attr, char *buf)
510 {
511 struct ata_device *ata_dev = transport_class_to_dev(dev);
512 struct ata_show_ering_arg arg = { buf, 0 };
513
514 ata_ering_map(&ata_dev->ering, ata_show_ering, &arg);
515 return arg.written;
516 }
517
518
519 static DEVICE_ATTR(ering, S_IRUGO, show_ata_dev_ering, NULL);
520
521 static ssize_t
522 show_ata_dev_id(struct device *dev,
523 struct device_attribute *attr, char *buf)
524 {
525 struct ata_device *ata_dev = transport_class_to_dev(dev);
526 int written = 0, i = 0;
527
528 if (ata_dev->class == ATA_DEV_PMP)
529 return 0;
530 for(i=0;i<ATA_ID_WORDS;i++) {
531 written += snprintf(buf+written, 20, "%04x%c",
532 ata_dev->id[i],
533 ((i+1) & 7) ? ' ' : '\n');
534 }
535 return written;
536 }
537
538 static DEVICE_ATTR(id, S_IRUGO, show_ata_dev_id, NULL);
539
540 static ssize_t
541 show_ata_dev_gscr(struct device *dev,
542 struct device_attribute *attr, char *buf)
543 {
544 struct ata_device *ata_dev = transport_class_to_dev(dev);
545 int written = 0, i = 0;
546
547 if (ata_dev->class != ATA_DEV_PMP)
548 return 0;
549 for(i=0;i<SATA_PMP_GSCR_DWORDS;i++) {
550 written += snprintf(buf+written, 20, "%08x%c",
551 ata_dev->gscr[i],
552 ((i+1) & 3) ? ' ' : '\n');
553 }
554 if (SATA_PMP_GSCR_DWORDS & 3)
555 buf[written-1] = '\n';
556 return written;
557 }
558
559 static DEVICE_ATTR(gscr, S_IRUGO, show_ata_dev_gscr, NULL);
560
561 static DECLARE_TRANSPORT_CLASS(ata_dev_class,
562 "ata_device", NULL, NULL, NULL);
563
564 static void ata_tdev_release(struct device *dev)
565 {
566 put_device(dev->parent);
567 }
568
569 /**
570 * ata_is_ata_dev -- check if a struct device represents a ATA device
571 * @dev: device to check
572 *
573 * Returns:
574 * %1 if the device represents a ATA device, %0 else
575 */
576 static int ata_is_ata_dev(const struct device *dev)
577 {
578 return dev->release == ata_tdev_release;
579 }
580
581 static int ata_tdev_match(struct attribute_container *cont,
582 struct device *dev)
583 {
584 struct ata_internal* i = to_ata_internal(ata_scsi_transport_template);
585 if (!ata_is_ata_dev(dev))
586 return 0;
587 return &i->dev_attr_cont.ac == cont;
588 }
589
590 /**
591 * ata_tdev_free -- free a ATA LINK
592 * @dev: ATA PHY to free
593 *
594 * Frees the specified ATA PHY.
595 *
596 * Note:
597 * This function must only be called on a PHY that has not
598 * successfully been added using ata_tdev_add().
599 */
600 static void ata_tdev_free(struct ata_device *dev)
601 {
602 transport_destroy_device(&dev->tdev);
603 put_device(&dev->tdev);
604 }
605
606 /**
607 * ata_tdev_delete -- remove ATA device
608 * @port: ATA PORT to remove
609 *
610 * Removes the specified ATA device.
611 */
612 static void ata_tdev_delete(struct ata_device *ata_dev)
613 {
614 struct device *dev = &ata_dev->tdev;
615
616 transport_remove_device(dev);
617 device_del(dev);
618 ata_tdev_free(ata_dev);
619 }
620
621
622 /**
623 * ata_tdev_add -- initialize a transport ATA device structure.
624 * @ata_dev: ata_dev structure.
625 *
626 * Initialize an ATA device structure for sysfs. It will be added in the
627 * device tree below the ATA LINK device it belongs to.
628 *
629 * Returns %0 on success
630 */
631 static int ata_tdev_add(struct ata_device *ata_dev)
632 {
633 struct device *dev = &ata_dev->tdev;
634 struct ata_link *link = ata_dev->link;
635 struct ata_port *ap = link->ap;
636 int error;
637
638 device_initialize(dev);
639 dev->parent = get_device(&link->tdev);
640 dev->release = ata_tdev_release;
641 if (ata_is_host_link(link))
642 dev_set_name(dev, "dev%d.%d", ap->print_id,ata_dev->devno);
643 else
644 dev_set_name(dev, "dev%d.%d.0", ap->print_id, link->pmp);
645
646 transport_setup_device(dev);
647 error = device_add(dev);
648 if (error) {
649 ata_tdev_free(ata_dev);
650 return error;
651 }
652
653 transport_add_device(dev);
654 transport_configure_device(dev);
655 return 0;
656 }
657
658
659 /*
660 * Setup / Teardown code
661 */
662
663 #define SETUP_TEMPLATE(attrb, field, perm, test) \
664 i->private_##attrb[count] = dev_attr_##field; \
665 i->private_##attrb[count].attr.mode = perm; \
666 i->attrb[count] = &i->private_##attrb[count]; \
667 if (test) \
668 count++
669
670 #define SETUP_LINK_ATTRIBUTE(field) \
671 SETUP_TEMPLATE(link_attrs, field, S_IRUGO, 1)
672
673 #define SETUP_PORT_ATTRIBUTE(field) \
674 SETUP_TEMPLATE(port_attrs, field, S_IRUGO, 1)
675
676 #define SETUP_DEV_ATTRIBUTE(field) \
677 SETUP_TEMPLATE(dev_attrs, field, S_IRUGO, 1)
678
679 /**
680 * ata_attach_transport -- instantiate ATA transport template
681 */
682 struct scsi_transport_template *ata_attach_transport(void)
683 {
684 struct ata_internal *i;
685 int count;
686
687 i = kzalloc(sizeof(struct ata_internal), GFP_KERNEL);
688 if (!i)
689 return NULL;
690
691 i->t.eh_strategy_handler = ata_scsi_error;
692 i->t.eh_timed_out = ata_scsi_timed_out;
693 i->t.user_scan = ata_scsi_user_scan;
694
695 i->t.host_attrs.ac.attrs = &i->port_attrs[0];
696 i->t.host_attrs.ac.class = &ata_port_class.class;
697 i->t.host_attrs.ac.match = ata_tport_match;
698 transport_container_register(&i->t.host_attrs);
699
700 i->link_attr_cont.ac.class = &ata_link_class.class;
701 i->link_attr_cont.ac.attrs = &i->link_attrs[0];
702 i->link_attr_cont.ac.match = ata_tlink_match;
703 transport_container_register(&i->link_attr_cont);
704
705 i->dev_attr_cont.ac.class = &ata_dev_class.class;
706 i->dev_attr_cont.ac.attrs = &i->dev_attrs[0];
707 i->dev_attr_cont.ac.match = ata_tdev_match;
708 transport_container_register(&i->dev_attr_cont);
709
710 count = 0;
711 SETUP_PORT_ATTRIBUTE(nr_pmp_links);
712 SETUP_PORT_ATTRIBUTE(idle_irq);
713 SETUP_PORT_ATTRIBUTE(port_no);
714 BUG_ON(count > ATA_PORT_ATTRS);
715 i->port_attrs[count] = NULL;
716
717 count = 0;
718 SETUP_LINK_ATTRIBUTE(hw_sata_spd_limit);
719 SETUP_LINK_ATTRIBUTE(sata_spd_limit);
720 SETUP_LINK_ATTRIBUTE(sata_spd);
721 BUG_ON(count > ATA_LINK_ATTRS);
722 i->link_attrs[count] = NULL;
723
724 count = 0;
725 SETUP_DEV_ATTRIBUTE(class);
726 SETUP_DEV_ATTRIBUTE(pio_mode);
727 SETUP_DEV_ATTRIBUTE(dma_mode);
728 SETUP_DEV_ATTRIBUTE(xfer_mode);
729 SETUP_DEV_ATTRIBUTE(spdn_cnt);
730 SETUP_DEV_ATTRIBUTE(ering);
731 SETUP_DEV_ATTRIBUTE(id);
732 SETUP_DEV_ATTRIBUTE(gscr);
733 BUG_ON(count > ATA_DEV_ATTRS);
734 i->dev_attrs[count] = NULL;
735
736 return &i->t;
737 }
738
739 /**
740 * ata_release_transport -- release ATA transport template instance
741 * @t: transport template instance
742 */
743 void ata_release_transport(struct scsi_transport_template *t)
744 {
745 struct ata_internal *i = to_ata_internal(t);
746
747 transport_container_unregister(&i->t.host_attrs);
748 transport_container_unregister(&i->link_attr_cont);
749 transport_container_unregister(&i->dev_attr_cont);
750
751 kfree(i);
752 }
753
754 __init int libata_transport_init(void)
755 {
756 int error;
757
758 error = transport_class_register(&ata_link_class);
759 if (error)
760 goto out_unregister_transport;
761 error = transport_class_register(&ata_port_class);
762 if (error)
763 goto out_unregister_link;
764 error = transport_class_register(&ata_dev_class);
765 if (error)
766 goto out_unregister_port;
767 return 0;
768
769 out_unregister_port:
770 transport_class_unregister(&ata_port_class);
771 out_unregister_link:
772 transport_class_unregister(&ata_link_class);
773 out_unregister_transport:
774 return error;
775
776 }
777
778 void __exit libata_transport_exit(void)
779 {
780 transport_class_unregister(&ata_link_class);
781 transport_class_unregister(&ata_port_class);
782 transport_class_unregister(&ata_dev_class);
783 }
Linux kernel - Deliverables
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