1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *  Copyright 2008 ioogle, Inc.  All rights reserved.
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_ZAC,			"zac" },
147 	{ ATA_DEV_NONE,			"none" }
148 };
149 ata_bitfield_name_search(class, ata_class_names)
150 
151 
152 static struct {
153 	u32		value;
154 	char		*name;
155 } ata_err_names[] = {
156 	{ AC_ERR_DEV,			"DeviceError" },
157 	{ AC_ERR_HSM,			"HostStateMachineError" },
158 	{ AC_ERR_TIMEOUT,		"Timeout" },
159 	{ AC_ERR_MEDIA,			"MediaError" },
160 	{ AC_ERR_ATA_BUS,		"BusError" },
161 	{ AC_ERR_HOST_BUS,		"HostBusError" },
162 	{ AC_ERR_SYSTEM,		"SystemError" },
163 	{ AC_ERR_INVALID,		"InvalidArg" },
164 	{ AC_ERR_OTHER,			"Unknown" },
165 	{ AC_ERR_NODEV_HINT,		"NoDeviceHint" },
166 	{ AC_ERR_NCQ,		 	"NCQError" }
167 };
168 ata_bitfield_name_match(err, ata_err_names)
169 
170 static struct {
171 	u32		value;
172 	char		*name;
173 } ata_xfer_names[] = {
174 	{ XFER_UDMA_7,			"XFER_UDMA_7" },
175 	{ XFER_UDMA_6,			"XFER_UDMA_6" },
176 	{ XFER_UDMA_5,			"XFER_UDMA_5" },
177 	{ XFER_UDMA_4,			"XFER_UDMA_4" },
178 	{ XFER_UDMA_3,			"XFER_UDMA_3" },
179 	{ XFER_UDMA_2,			"XFER_UDMA_2" },
180 	{ XFER_UDMA_1,			"XFER_UDMA_1" },
181 	{ XFER_UDMA_0,			"XFER_UDMA_0" },
182 	{ XFER_MW_DMA_4,		"XFER_MW_DMA_4" },
183 	{ XFER_MW_DMA_3,		"XFER_MW_DMA_3" },
184 	{ XFER_MW_DMA_2,		"XFER_MW_DMA_2" },
185 	{ XFER_MW_DMA_1,		"XFER_MW_DMA_1" },
186 	{ XFER_MW_DMA_0,		"XFER_MW_DMA_0" },
187 	{ XFER_SW_DMA_2,		"XFER_SW_DMA_2" },
188 	{ XFER_SW_DMA_1,		"XFER_SW_DMA_1" },
189 	{ XFER_SW_DMA_0,		"XFER_SW_DMA_0" },
190 	{ XFER_PIO_6,			"XFER_PIO_6" },
191 	{ XFER_PIO_5,			"XFER_PIO_5" },
192 	{ XFER_PIO_4,			"XFER_PIO_4" },
193 	{ XFER_PIO_3,			"XFER_PIO_3" },
194 	{ XFER_PIO_2,			"XFER_PIO_2" },
195 	{ XFER_PIO_1,			"XFER_PIO_1" },
196 	{ XFER_PIO_0,			"XFER_PIO_0" },
197 	{ XFER_PIO_SLOW,		"XFER_PIO_SLOW" }
198 };
199 ata_bitfield_name_match(xfer,ata_xfer_names)
200 
201 /*
202  * ATA Port attributes
203  */
204 #define ata_port_show_simple(field, name, format_string, cast)		\
205 static ssize_t								\
206 show_ata_port_##name(struct device *dev,				\
207 		     struct device_attribute *attr, char *buf)		\
208 {									\
209 	struct ata_port *ap = transport_class_to_port(dev);		\
210 									\
211 	return snprintf(buf, 20, format_string, cast ap->field);	\
212 }
213 
214 #define ata_port_simple_attr(field, name, format_string, type)		\
215 	ata_port_show_simple(field, name, format_string, (type))	\
216 static DEVICE_ATTR(name, S_IRUGO, show_ata_port_##name, NULL)
217 
218 ata_port_simple_attr(nr_pmp_links, nr_pmp_links, "%d\n", int);
219 ata_port_simple_attr(stats.idle_irq, idle_irq, "%ld\n", unsigned long);
220 ata_port_simple_attr(local_port_no, port_no, "%u\n", unsigned int);
221 
222 static DECLARE_TRANSPORT_CLASS(ata_port_class,
223 			       "ata_port", NULL, NULL, NULL);
224 
225 static void ata_tport_release(struct device *dev)
226 {
227 	struct ata_port *ap = tdev_to_port(dev);
228 	ata_host_put(ap->host);
229 }
230 
231 /**
232  * ata_is_port --  check if a struct device represents a ATA port
233  * @dev:	device to check
234  *
235  * Returns:
236  *	%1 if the device represents a ATA Port, %0 else
237  */
238 static int ata_is_port(const struct device *dev)
239 {
240 	return dev->release == ata_tport_release;
241 }
242 
243 static int ata_tport_match(struct attribute_container *cont,
244 			   struct device *dev)
245 {
246 	if (!ata_is_port(dev))
247 		return 0;
248 	return &ata_scsi_transport_template->host_attrs.ac == cont;
249 }
250 
251 /**
252  * ata_tport_delete  --  remove ATA PORT
253  * @port:	ATA PORT to remove
254  *
255  * Removes the specified ATA PORT.  Remove the associated link as well.
256  */
257 void ata_tport_delete(struct ata_port *ap)
258 {
259 	struct device *dev = &ap->tdev;
260 
261 	ata_tlink_delete(&ap->link);
262 
263 	transport_remove_device(dev);
264 	device_del(dev);
265 	transport_destroy_device(dev);
266 	put_device(dev);
267 }
268 
269 /** ata_tport_add - initialize a transport ATA port structure
270  *
271  * @parent:	parent device
272  * @ap:		existing ata_port structure
273  *
274  * Initialize a ATA port structure for sysfs.  It will be added to the device
275  * tree below the device specified by @parent which could be a PCI device.
276  *
277  * Returns %0 on success
278  */
279 int ata_tport_add(struct device *parent,
280 		  struct ata_port *ap)
281 {
282 	int error;
283 	struct device *dev = &ap->tdev;
284 
285 	device_initialize(dev);
286 	dev->type = &ata_port_type;
287 
288 	dev->parent = parent;
289 	ata_host_get(ap->host);
290 	dev->release = ata_tport_release;
291 	dev_set_name(dev, "ata%d", ap->print_id);
292 	transport_setup_device(dev);
293 	ata_acpi_bind_port(ap);
294 	error = device_add(dev);
295 	if (error) {
296 		goto tport_err;
297 	}
298 
299 	device_enable_async_suspend(dev);
300 	pm_runtime_set_active(dev);
301 	pm_runtime_enable(dev);
302 	pm_runtime_forbid(dev);
303 
304 	transport_add_device(dev);
305 	transport_configure_device(dev);
306 
307 	error = ata_tlink_add(&ap->link);
308 	if (error) {
309 		goto tport_link_err;
310 	}
311 	return 0;
312 
313  tport_link_err:
314 	transport_remove_device(dev);
315 	device_del(dev);
316 
317  tport_err:
318 	transport_destroy_device(dev);
319 	put_device(dev);
320 	ata_host_put(ap->host);
321 	return error;
322 }
323 
324 
325 /*
326  * ATA link attributes
327  */
328 static int noop(int x) { return x; }
329 
330 #define ata_link_show_linkspeed(field, format)			        \
331 static ssize_t								\
332 show_ata_link_##field(struct device *dev,				\
333 		      struct device_attribute *attr, char *buf)		\
334 {									\
335 	struct ata_link *link = transport_class_to_link(dev);		\
336 									\
337 	return sprintf(buf, "%s\n", sata_spd_string(format(link->field))); \
338 }
339 
340 #define ata_link_linkspeed_attr(field, format)				\
341 	ata_link_show_linkspeed(field, format)				\
342 static DEVICE_ATTR(field, S_IRUGO, show_ata_link_##field, NULL)
343 
344 ata_link_linkspeed_attr(hw_sata_spd_limit, fls);
345 ata_link_linkspeed_attr(sata_spd_limit, fls);
346 ata_link_linkspeed_attr(sata_spd, noop);
347 
348 
349 static DECLARE_TRANSPORT_CLASS(ata_link_class,
350 		"ata_link", NULL, NULL, NULL);
351 
352 static void ata_tlink_release(struct device *dev)
353 {
354 }
355 
356 /**
357  * ata_is_link --  check if a struct device represents a ATA link
358  * @dev:	device to check
359  *
360  * Returns:
361  *	%1 if the device represents a ATA link, %0 else
362  */
363 static int ata_is_link(const struct device *dev)
364 {
365 	return dev->release == ata_tlink_release;
366 }
367 
368 static int ata_tlink_match(struct attribute_container *cont,
369 			   struct device *dev)
370 {
371 	struct ata_internal* i = to_ata_internal(ata_scsi_transport_template);
372 	if (!ata_is_link(dev))
373 		return 0;
374 	return &i->link_attr_cont.ac == cont;
375 }
376 
377 /**
378  * ata_tlink_delete  --  remove ATA LINK
379  * @port:	ATA LINK to remove
380  *
381  * Removes the specified ATA LINK.  remove associated ATA device(s) as well.
382  */
383 void ata_tlink_delete(struct ata_link *link)
384 {
385 	struct device *dev = &link->tdev;
386 	struct ata_device *ata_dev;
387 
388 	ata_for_each_dev(ata_dev, link, ALL) {
389 		ata_tdev_delete(ata_dev);
390 	}
391 
392 	transport_remove_device(dev);
393 	device_del(dev);
394 	transport_destroy_device(dev);
395 	put_device(dev);
396 }
397 
398 /**
399  * ata_tlink_add  --  initialize a transport ATA link structure
400  * @link:	allocated ata_link structure.
401  *
402  * Initialize an ATA LINK structure for sysfs.  It will be added in the
403  * device tree below the ATA PORT it belongs to.
404  *
405  * Returns %0 on success
406  */
407 int ata_tlink_add(struct ata_link *link)
408 {
409 	struct device *dev = &link->tdev;
410 	struct ata_port *ap = link->ap;
411 	struct ata_device *ata_dev;
412 	int error;
413 
414 	device_initialize(dev);
415 	dev->parent = &ap->tdev;
416 	dev->release = ata_tlink_release;
417 	if (ata_is_host_link(link))
418 		dev_set_name(dev, "link%d", ap->print_id);
419         else
420 		dev_set_name(dev, "link%d.%d", ap->print_id, link->pmp);
421 
422 	transport_setup_device(dev);
423 
424 	error = device_add(dev);
425 	if (error) {
426 		goto tlink_err;
427 	}
428 
429 	transport_add_device(dev);
430 	transport_configure_device(dev);
431 
432 	ata_for_each_dev(ata_dev, link, ALL) {
433 		error = ata_tdev_add(ata_dev);
434 		if (error) {
435 			goto tlink_dev_err;
436 		}
437 	}
438 	return 0;
439   tlink_dev_err:
440 	while (--ata_dev >= link->device) {
441 		ata_tdev_delete(ata_dev);
442 	}
443 	transport_remove_device(dev);
444 	device_del(dev);
445   tlink_err:
446 	transport_destroy_device(dev);
447 	put_device(dev);
448 	return error;
449 }
450 
451 /*
452  * ATA device attributes
453  */
454 
455 #define ata_dev_show_class(title, field)				\
456 static ssize_t								\
457 show_ata_dev_##field(struct device *dev,				\
458 		     struct device_attribute *attr, char *buf)		\
459 {									\
460 	struct ata_device *ata_dev = transport_class_to_dev(dev);	\
461 									\
462 	return get_ata_##title##_names(ata_dev->field, buf);		\
463 }
464 
465 #define ata_dev_attr(title, field)					\
466 	ata_dev_show_class(title, field)				\
467 static DEVICE_ATTR(field, S_IRUGO, show_ata_dev_##field, NULL)
468 
469 ata_dev_attr(class, class);
470 ata_dev_attr(xfer, pio_mode);
471 ata_dev_attr(xfer, dma_mode);
472 ata_dev_attr(xfer, xfer_mode);
473 
474 
475 #define ata_dev_show_simple(field, format_string, cast)		\
476 static ssize_t								\
477 show_ata_dev_##field(struct device *dev,				\
478 		     struct device_attribute *attr, char *buf)		\
479 {									\
480 	struct ata_device *ata_dev = transport_class_to_dev(dev);	\
481 									\
482 	return snprintf(buf, 20, format_string, cast ata_dev->field);	\
483 }
484 
485 #define ata_dev_simple_attr(field, format_string, type)	\
486 	ata_dev_show_simple(field, format_string, (type))	\
487 static DEVICE_ATTR(field, S_IRUGO, 			\
488 		   show_ata_dev_##field, NULL)
489 
490 ata_dev_simple_attr(spdn_cnt, "%d\n", int);
491 
492 struct ata_show_ering_arg {
493 	char* buf;
494 	int written;
495 };
496 
497 static int ata_show_ering(struct ata_ering_entry *ent, void *void_arg)
498 {
499 	struct ata_show_ering_arg* arg = void_arg;
500 	u64 seconds;
501 	u32 rem;
502 
503 	seconds = div_u64_rem(ent->timestamp, HZ, &rem);
504 	arg->written += sprintf(arg->buf + arg->written,
505 			        "[%5llu.%09lu]", seconds,
506 				rem * NSEC_PER_SEC / HZ);
507 	arg->written += get_ata_err_names(ent->err_mask,
508 					  arg->buf + arg->written);
509 	return 0;
510 }
511 
512 static ssize_t
513 show_ata_dev_ering(struct device *dev,
514 		   struct device_attribute *attr, char *buf)
515 {
516 	struct ata_device *ata_dev = transport_class_to_dev(dev);
517 	struct ata_show_ering_arg arg = { buf, 0 };
518 
519 	ata_ering_map(&ata_dev->ering, ata_show_ering, &arg);
520 	return arg.written;
521 }
522 
523 
524 static DEVICE_ATTR(ering, S_IRUGO, show_ata_dev_ering, NULL);
525 
526 static ssize_t
527 show_ata_dev_id(struct device *dev,
528 		struct device_attribute *attr, char *buf)
529 {
530 	struct ata_device *ata_dev = transport_class_to_dev(dev);
531 	int written = 0, i = 0;
532 
533 	if (ata_dev->class == ATA_DEV_PMP)
534 		return 0;
535 	for(i=0;i<ATA_ID_WORDS;i++)  {
536 		written += snprintf(buf+written, 20, "%04x%c",
537 				    ata_dev->id[i],
538 				    ((i+1) & 7) ? ' ' : '\n');
539 	}
540 	return written;
541 }
542 
543 static DEVICE_ATTR(id, S_IRUGO, show_ata_dev_id, NULL);
544 
545 static ssize_t
546 show_ata_dev_gscr(struct device *dev,
547 		  struct device_attribute *attr, char *buf)
548 {
549 	struct ata_device *ata_dev = transport_class_to_dev(dev);
550 	int written = 0, i = 0;
551 
552 	if (ata_dev->class != ATA_DEV_PMP)
553 		return 0;
554 	for(i=0;i<SATA_PMP_GSCR_DWORDS;i++)  {
555 		written += snprintf(buf+written, 20, "%08x%c",
556 				    ata_dev->gscr[i],
557 				    ((i+1) & 3) ? ' ' : '\n');
558 	}
559 	if (SATA_PMP_GSCR_DWORDS & 3)
560 		buf[written-1] = '\n';
561 	return written;
562 }
563 
564 static DEVICE_ATTR(gscr, S_IRUGO, show_ata_dev_gscr, NULL);
565 
566 static ssize_t
567 show_ata_dev_trim(struct device *dev,
568 		  struct device_attribute *attr, char *buf)
569 {
570 	struct ata_device *ata_dev = transport_class_to_dev(dev);
571 	unsigned char *mode;
572 
573 	if (!ata_id_has_trim(ata_dev->id))
574 		mode = "unsupported";
575 	else if (ata_dev->horkage & ATA_HORKAGE_NOTRIM)
576 		mode = "forced_unsupported";
577 	else if (ata_dev->horkage & ATA_HORKAGE_NO_NCQ_TRIM)
578 			mode = "forced_unqueued";
579 	else if (ata_fpdma_dsm_supported(ata_dev))
580 		mode = "queued";
581 	else
582 		mode = "unqueued";
583 
584 	return snprintf(buf, 20, "%s\n", mode);
585 }
586 
587 static DEVICE_ATTR(trim, S_IRUGO, show_ata_dev_trim, NULL);
588 
589 static DECLARE_TRANSPORT_CLASS(ata_dev_class,
590 			       "ata_device", NULL, NULL, NULL);
591 
592 static void ata_tdev_release(struct device *dev)
593 {
594 }
595 
596 /**
597  * ata_is_ata_dev  --  check if a struct device represents a ATA device
598  * @dev:	device to check
599  *
600  * Returns:
601  *	%1 if the device represents a ATA device, %0 else
602  */
603 static int ata_is_ata_dev(const struct device *dev)
604 {
605 	return dev->release == ata_tdev_release;
606 }
607 
608 static int ata_tdev_match(struct attribute_container *cont,
609 			  struct device *dev)
610 {
611 	struct ata_internal* i = to_ata_internal(ata_scsi_transport_template);
612 	if (!ata_is_ata_dev(dev))
613 		return 0;
614 	return &i->dev_attr_cont.ac == cont;
615 }
616 
617 /**
618  * ata_tdev_free  --  free a ATA LINK
619  * @dev:	ATA PHY to free
620  *
621  * Frees the specified ATA PHY.
622  *
623  * Note:
624  *   This function must only be called on a PHY that has not
625  *   successfully been added using ata_tdev_add().
626  */
627 static void ata_tdev_free(struct ata_device *dev)
628 {
629 	transport_destroy_device(&dev->tdev);
630 	put_device(&dev->tdev);
631 }
632 
633 /**
634  * ata_tdev_delete  --  remove ATA device
635  * @port:	ATA PORT to remove
636  *
637  * Removes the specified ATA device.
638  */
639 static void ata_tdev_delete(struct ata_device *ata_dev)
640 {
641 	struct device *dev = &ata_dev->tdev;
642 
643 	transport_remove_device(dev);
644 	device_del(dev);
645 	ata_tdev_free(ata_dev);
646 }
647 
648 
649 /**
650  * ata_tdev_add  --  initialize a transport ATA device structure.
651  * @ata_dev:	ata_dev structure.
652  *
653  * Initialize an ATA device structure for sysfs.  It will be added in the
654  * device tree below the ATA LINK device it belongs to.
655  *
656  * Returns %0 on success
657  */
658 static int ata_tdev_add(struct ata_device *ata_dev)
659 {
660 	struct device *dev = &ata_dev->tdev;
661 	struct ata_link *link = ata_dev->link;
662 	struct ata_port *ap = link->ap;
663 	int error;
664 
665 	device_initialize(dev);
666 	dev->parent = &link->tdev;
667 	dev->release = ata_tdev_release;
668 	if (ata_is_host_link(link))
669 		dev_set_name(dev, "dev%d.%d", ap->print_id,ata_dev->devno);
670         else
671 		dev_set_name(dev, "dev%d.%d.0", ap->print_id, link->pmp);
672 
673 	transport_setup_device(dev);
674 	ata_acpi_bind_dev(ata_dev);
675 	error = device_add(dev);
676 	if (error) {
677 		ata_tdev_free(ata_dev);
678 		return error;
679 	}
680 
681 	transport_add_device(dev);
682 	transport_configure_device(dev);
683 	return 0;
684 }
685 
686 
687 /*
688  * Setup / Teardown code
689  */
690 
691 #define SETUP_TEMPLATE(attrb, field, perm, test)			\
692 	i->private_##attrb[count] = dev_attr_##field;		       	\
693 	i->private_##attrb[count].attr.mode = perm;			\
694 	i->attrb[count] = &i->private_##attrb[count];			\
695 	if (test)							\
696 		count++
697 
698 #define SETUP_LINK_ATTRIBUTE(field)					\
699 	SETUP_TEMPLATE(link_attrs, field, S_IRUGO, 1)
700 
701 #define SETUP_PORT_ATTRIBUTE(field)					\
702 	SETUP_TEMPLATE(port_attrs, field, S_IRUGO, 1)
703 
704 #define SETUP_DEV_ATTRIBUTE(field)					\
705 	SETUP_TEMPLATE(dev_attrs, field, S_IRUGO, 1)
706 
707 /**
708  * ata_attach_transport  --  instantiate ATA transport template
709  */
710 struct scsi_transport_template *ata_attach_transport(void)
711 {
712 	struct ata_internal *i;
713 	int count;
714 
715 	i = kzalloc(sizeof(struct ata_internal), GFP_KERNEL);
716 	if (!i)
717 		return NULL;
718 
719 	i->t.eh_strategy_handler	= ata_scsi_error;
720 	i->t.user_scan			= ata_scsi_user_scan;
721 
722 	i->t.host_attrs.ac.attrs = &i->port_attrs[0];
723 	i->t.host_attrs.ac.class = &ata_port_class.class;
724 	i->t.host_attrs.ac.match = ata_tport_match;
725 	transport_container_register(&i->t.host_attrs);
726 
727 	i->link_attr_cont.ac.class = &ata_link_class.class;
728 	i->link_attr_cont.ac.attrs = &i->link_attrs[0];
729 	i->link_attr_cont.ac.match = ata_tlink_match;
730 	transport_container_register(&i->link_attr_cont);
731 
732 	i->dev_attr_cont.ac.class = &ata_dev_class.class;
733 	i->dev_attr_cont.ac.attrs = &i->dev_attrs[0];
734 	i->dev_attr_cont.ac.match = ata_tdev_match;
735 	transport_container_register(&i->dev_attr_cont);
736 
737 	count = 0;
738 	SETUP_PORT_ATTRIBUTE(nr_pmp_links);
739 	SETUP_PORT_ATTRIBUTE(idle_irq);
740 	SETUP_PORT_ATTRIBUTE(port_no);
741 	BUG_ON(count > ATA_PORT_ATTRS);
742 	i->port_attrs[count] = NULL;
743 
744 	count = 0;
745 	SETUP_LINK_ATTRIBUTE(hw_sata_spd_limit);
746 	SETUP_LINK_ATTRIBUTE(sata_spd_limit);
747 	SETUP_LINK_ATTRIBUTE(sata_spd);
748 	BUG_ON(count > ATA_LINK_ATTRS);
749 	i->link_attrs[count] = NULL;
750 
751 	count = 0;
752 	SETUP_DEV_ATTRIBUTE(class);
753 	SETUP_DEV_ATTRIBUTE(pio_mode);
754 	SETUP_DEV_ATTRIBUTE(dma_mode);
755 	SETUP_DEV_ATTRIBUTE(xfer_mode);
756 	SETUP_DEV_ATTRIBUTE(spdn_cnt);
757 	SETUP_DEV_ATTRIBUTE(ering);
758 	SETUP_DEV_ATTRIBUTE(id);
759 	SETUP_DEV_ATTRIBUTE(gscr);
760 	SETUP_DEV_ATTRIBUTE(trim);
761 	BUG_ON(count > ATA_DEV_ATTRS);
762 	i->dev_attrs[count] = NULL;
763 
764 	return &i->t;
765 }
766 
767 /**
768  * ata_release_transport  --  release ATA transport template instance
769  * @t:		transport template instance
770  */
771 void ata_release_transport(struct scsi_transport_template *t)
772 {
773 	struct ata_internal *i = to_ata_internal(t);
774 
775 	transport_container_unregister(&i->t.host_attrs);
776 	transport_container_unregister(&i->link_attr_cont);
777 	transport_container_unregister(&i->dev_attr_cont);
778 
779 	kfree(i);
780 }
781 
782 __init int libata_transport_init(void)
783 {
784 	int error;
785 
786 	error = transport_class_register(&ata_link_class);
787 	if (error)
788 		goto out_unregister_transport;
789 	error = transport_class_register(&ata_port_class);
790 	if (error)
791 		goto out_unregister_link;
792 	error = transport_class_register(&ata_dev_class);
793 	if (error)
794 		goto out_unregister_port;
795 	return 0;
796 
797  out_unregister_port:
798 	transport_class_unregister(&ata_port_class);
799  out_unregister_link:
800 	transport_class_unregister(&ata_link_class);
801  out_unregister_transport:
802 	return error;
803 
804 }
805 
806 void __exit libata_transport_exit(void)
807 {
808 	transport_class_unregister(&ata_link_class);
809 	transport_class_unregister(&ata_port_class);
810 	transport_class_unregister(&ata_dev_class);
811 }
812