xref: /openbmc/linux/drivers/firmware/edd.c (revision ddc141e5)
1 /*
2  * linux/drivers/firmware/edd.c
3  *  Copyright (C) 2002, 2003, 2004 Dell Inc.
4  *  by Matt Domsch <Matt_Domsch@dell.com>
5  *  disk signature by Matt Domsch, Andrew Wilks, and Sandeep K. Shandilya
6  *  legacy CHS by Patrick J. LoPresti <patl@users.sourceforge.net>
7  *
8  * BIOS Enhanced Disk Drive Services (EDD)
9  * conformant to T13 Committee www.t13.org
10  *   projects 1572D, 1484D, 1386D, 1226DT
11  *
12  * This code takes information provided by BIOS EDD calls
13  * fn41 - Check Extensions Present and
14  * fn48 - Get Device Parameters with EDD extensions
15  * made in setup.S, copied to safe structures in setup.c,
16  * and presents it in sysfs.
17  *
18  * Please see http://linux.dell.com/edd/results.html for
19  * the list of BIOSs which have been reported to implement EDD.
20  *
21  * This program is free software; you can redistribute it and/or modify
22  * it under the terms of the GNU General Public License v2.0 as published by
23  * the Free Software Foundation
24  *
25  * This program is distributed in the hope that it will be useful,
26  * but WITHOUT ANY WARRANTY; without even the implied warranty of
27  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
28  * GNU General Public License for more details.
29  *
30  */
31 
32 #include <linux/module.h>
33 #include <linux/string.h>
34 #include <linux/types.h>
35 #include <linux/init.h>
36 #include <linux/stat.h>
37 #include <linux/err.h>
38 #include <linux/ctype.h>
39 #include <linux/slab.h>
40 #include <linux/limits.h>
41 #include <linux/device.h>
42 #include <linux/pci.h>
43 #include <linux/blkdev.h>
44 #include <linux/edd.h>
45 
46 #define EDD_VERSION "0.16"
47 #define EDD_DATE    "2004-Jun-25"
48 
49 MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>");
50 MODULE_DESCRIPTION("sysfs interface to BIOS EDD information");
51 MODULE_LICENSE("GPL");
52 MODULE_VERSION(EDD_VERSION);
53 
54 #define left (PAGE_SIZE - (p - buf) - 1)
55 
56 struct edd_device {
57 	unsigned int index;
58 	unsigned int mbr_signature;
59 	struct edd_info *info;
60 	struct kobject kobj;
61 };
62 
63 struct edd_attribute {
64 	struct attribute attr;
65 	ssize_t(*show) (struct edd_device * edev, char *buf);
66 	int (*test) (struct edd_device * edev);
67 };
68 
69 /* forward declarations */
70 static int edd_dev_is_type(struct edd_device *edev, const char *type);
71 static struct pci_dev *edd_get_pci_dev(struct edd_device *edev);
72 
73 static struct edd_device *edd_devices[EDD_MBR_SIG_MAX];
74 
75 #define EDD_DEVICE_ATTR(_name,_mode,_show,_test) \
76 struct edd_attribute edd_attr_##_name = { 	\
77 	.attr = {.name = __stringify(_name), .mode = _mode },	\
78 	.show	= _show,				\
79 	.test	= _test,				\
80 };
81 
82 static int
83 edd_has_mbr_signature(struct edd_device *edev)
84 {
85 	return edev->index < min_t(unsigned char, edd.mbr_signature_nr, EDD_MBR_SIG_MAX);
86 }
87 
88 static int
89 edd_has_edd_info(struct edd_device *edev)
90 {
91 	return edev->index < min_t(unsigned char, edd.edd_info_nr, EDDMAXNR);
92 }
93 
94 static inline struct edd_info *
95 edd_dev_get_info(struct edd_device *edev)
96 {
97 	return edev->info;
98 }
99 
100 static inline void
101 edd_dev_set_info(struct edd_device *edev, int i)
102 {
103 	edev->index = i;
104 	if (edd_has_mbr_signature(edev))
105 		edev->mbr_signature = edd.mbr_signature[i];
106 	if (edd_has_edd_info(edev))
107 		edev->info = &edd.edd_info[i];
108 }
109 
110 #define to_edd_attr(_attr) container_of(_attr,struct edd_attribute,attr)
111 #define to_edd_device(obj) container_of(obj,struct edd_device,kobj)
112 
113 static ssize_t
114 edd_attr_show(struct kobject * kobj, struct attribute *attr, char *buf)
115 {
116 	struct edd_device *dev = to_edd_device(kobj);
117 	struct edd_attribute *edd_attr = to_edd_attr(attr);
118 	ssize_t ret = -EIO;
119 
120 	if (edd_attr->show)
121 		ret = edd_attr->show(dev, buf);
122 	return ret;
123 }
124 
125 static const struct sysfs_ops edd_attr_ops = {
126 	.show = edd_attr_show,
127 };
128 
129 static ssize_t
130 edd_show_host_bus(struct edd_device *edev, char *buf)
131 {
132 	struct edd_info *info;
133 	char *p = buf;
134 	int i;
135 
136 	if (!edev)
137 		return -EINVAL;
138 	info = edd_dev_get_info(edev);
139 	if (!info || !buf)
140 		return -EINVAL;
141 
142 	for (i = 0; i < 4; i++) {
143 		if (isprint(info->params.host_bus_type[i])) {
144 			p += scnprintf(p, left, "%c", info->params.host_bus_type[i]);
145 		} else {
146 			p += scnprintf(p, left, " ");
147 		}
148 	}
149 
150 	if (!strncmp(info->params.host_bus_type, "ISA", 3)) {
151 		p += scnprintf(p, left, "\tbase_address: %x\n",
152 			     info->params.interface_path.isa.base_address);
153 	} else if (!strncmp(info->params.host_bus_type, "PCIX", 4) ||
154 		   !strncmp(info->params.host_bus_type, "PCI", 3) ||
155 		   !strncmp(info->params.host_bus_type, "XPRS", 4)) {
156 		p += scnprintf(p, left,
157 			     "\t%02x:%02x.%d  channel: %u\n",
158 			     info->params.interface_path.pci.bus,
159 			     info->params.interface_path.pci.slot,
160 			     info->params.interface_path.pci.function,
161 			     info->params.interface_path.pci.channel);
162 	} else if (!strncmp(info->params.host_bus_type, "IBND", 4) ||
163 		   !strncmp(info->params.host_bus_type, "HTPT", 4)) {
164 		p += scnprintf(p, left,
165 			     "\tTBD: %llx\n",
166 			     info->params.interface_path.ibnd.reserved);
167 
168 	} else {
169 		p += scnprintf(p, left, "\tunknown: %llx\n",
170 			     info->params.interface_path.unknown.reserved);
171 	}
172 	return (p - buf);
173 }
174 
175 static ssize_t
176 edd_show_interface(struct edd_device *edev, char *buf)
177 {
178 	struct edd_info *info;
179 	char *p = buf;
180 	int i;
181 
182 	if (!edev)
183 		return -EINVAL;
184 	info = edd_dev_get_info(edev);
185 	if (!info || !buf)
186 		return -EINVAL;
187 
188 	for (i = 0; i < 8; i++) {
189 		if (isprint(info->params.interface_type[i])) {
190 			p += scnprintf(p, left, "%c", info->params.interface_type[i]);
191 		} else {
192 			p += scnprintf(p, left, " ");
193 		}
194 	}
195 	if (!strncmp(info->params.interface_type, "ATAPI", 5)) {
196 		p += scnprintf(p, left, "\tdevice: %u  lun: %u\n",
197 			     info->params.device_path.atapi.device,
198 			     info->params.device_path.atapi.lun);
199 	} else if (!strncmp(info->params.interface_type, "ATA", 3)) {
200 		p += scnprintf(p, left, "\tdevice: %u\n",
201 			     info->params.device_path.ata.device);
202 	} else if (!strncmp(info->params.interface_type, "SCSI", 4)) {
203 		p += scnprintf(p, left, "\tid: %u  lun: %llu\n",
204 			     info->params.device_path.scsi.id,
205 			     info->params.device_path.scsi.lun);
206 	} else if (!strncmp(info->params.interface_type, "USB", 3)) {
207 		p += scnprintf(p, left, "\tserial_number: %llx\n",
208 			     info->params.device_path.usb.serial_number);
209 	} else if (!strncmp(info->params.interface_type, "1394", 4)) {
210 		p += scnprintf(p, left, "\teui: %llx\n",
211 			     info->params.device_path.i1394.eui);
212 	} else if (!strncmp(info->params.interface_type, "FIBRE", 5)) {
213 		p += scnprintf(p, left, "\twwid: %llx lun: %llx\n",
214 			     info->params.device_path.fibre.wwid,
215 			     info->params.device_path.fibre.lun);
216 	} else if (!strncmp(info->params.interface_type, "I2O", 3)) {
217 		p += scnprintf(p, left, "\tidentity_tag: %llx\n",
218 			     info->params.device_path.i2o.identity_tag);
219 	} else if (!strncmp(info->params.interface_type, "RAID", 4)) {
220 		p += scnprintf(p, left, "\tidentity_tag: %x\n",
221 			     info->params.device_path.raid.array_number);
222 	} else if (!strncmp(info->params.interface_type, "SATA", 4)) {
223 		p += scnprintf(p, left, "\tdevice: %u\n",
224 			     info->params.device_path.sata.device);
225 	} else {
226 		p += scnprintf(p, left, "\tunknown: %llx %llx\n",
227 			     info->params.device_path.unknown.reserved1,
228 			     info->params.device_path.unknown.reserved2);
229 	}
230 
231 	return (p - buf);
232 }
233 
234 /**
235  * edd_show_raw_data() - copies raw data to buffer for userspace to parse
236  * @edev: target edd_device
237  * @buf: output buffer
238  *
239  * Returns: number of bytes written, or -EINVAL on failure
240  */
241 static ssize_t
242 edd_show_raw_data(struct edd_device *edev, char *buf)
243 {
244 	struct edd_info *info;
245 	ssize_t len = sizeof (info->params);
246 	if (!edev)
247 		return -EINVAL;
248 	info = edd_dev_get_info(edev);
249 	if (!info || !buf)
250 		return -EINVAL;
251 
252 	if (!(info->params.key == 0xBEDD || info->params.key == 0xDDBE))
253 		len = info->params.length;
254 
255 	/* In case of buggy BIOSs */
256 	if (len > (sizeof(info->params)))
257 		len = sizeof(info->params);
258 
259 	memcpy(buf, &info->params, len);
260 	return len;
261 }
262 
263 static ssize_t
264 edd_show_version(struct edd_device *edev, char *buf)
265 {
266 	struct edd_info *info;
267 	char *p = buf;
268 	if (!edev)
269 		return -EINVAL;
270 	info = edd_dev_get_info(edev);
271 	if (!info || !buf)
272 		return -EINVAL;
273 
274 	p += scnprintf(p, left, "0x%02x\n", info->version);
275 	return (p - buf);
276 }
277 
278 static ssize_t
279 edd_show_mbr_signature(struct edd_device *edev, char *buf)
280 {
281 	char *p = buf;
282 	p += scnprintf(p, left, "0x%08x\n", edev->mbr_signature);
283 	return (p - buf);
284 }
285 
286 static ssize_t
287 edd_show_extensions(struct edd_device *edev, char *buf)
288 {
289 	struct edd_info *info;
290 	char *p = buf;
291 	if (!edev)
292 		return -EINVAL;
293 	info = edd_dev_get_info(edev);
294 	if (!info || !buf)
295 		return -EINVAL;
296 
297 	if (info->interface_support & EDD_EXT_FIXED_DISK_ACCESS) {
298 		p += scnprintf(p, left, "Fixed disk access\n");
299 	}
300 	if (info->interface_support & EDD_EXT_DEVICE_LOCKING_AND_EJECTING) {
301 		p += scnprintf(p, left, "Device locking and ejecting\n");
302 	}
303 	if (info->interface_support & EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT) {
304 		p += scnprintf(p, left, "Enhanced Disk Drive support\n");
305 	}
306 	if (info->interface_support & EDD_EXT_64BIT_EXTENSIONS) {
307 		p += scnprintf(p, left, "64-bit extensions\n");
308 	}
309 	return (p - buf);
310 }
311 
312 static ssize_t
313 edd_show_info_flags(struct edd_device *edev, char *buf)
314 {
315 	struct edd_info *info;
316 	char *p = buf;
317 	if (!edev)
318 		return -EINVAL;
319 	info = edd_dev_get_info(edev);
320 	if (!info || !buf)
321 		return -EINVAL;
322 
323 	if (info->params.info_flags & EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT)
324 		p += scnprintf(p, left, "DMA boundary error transparent\n");
325 	if (info->params.info_flags & EDD_INFO_GEOMETRY_VALID)
326 		p += scnprintf(p, left, "geometry valid\n");
327 	if (info->params.info_flags & EDD_INFO_REMOVABLE)
328 		p += scnprintf(p, left, "removable\n");
329 	if (info->params.info_flags & EDD_INFO_WRITE_VERIFY)
330 		p += scnprintf(p, left, "write verify\n");
331 	if (info->params.info_flags & EDD_INFO_MEDIA_CHANGE_NOTIFICATION)
332 		p += scnprintf(p, left, "media change notification\n");
333 	if (info->params.info_flags & EDD_INFO_LOCKABLE)
334 		p += scnprintf(p, left, "lockable\n");
335 	if (info->params.info_flags & EDD_INFO_NO_MEDIA_PRESENT)
336 		p += scnprintf(p, left, "no media present\n");
337 	if (info->params.info_flags & EDD_INFO_USE_INT13_FN50)
338 		p += scnprintf(p, left, "use int13 fn50\n");
339 	return (p - buf);
340 }
341 
342 static ssize_t
343 edd_show_legacy_max_cylinder(struct edd_device *edev, char *buf)
344 {
345 	struct edd_info *info;
346 	char *p = buf;
347 	if (!edev)
348 		return -EINVAL;
349 	info = edd_dev_get_info(edev);
350 	if (!info || !buf)
351 		return -EINVAL;
352 
353 	p += snprintf(p, left, "%u\n", info->legacy_max_cylinder);
354 	return (p - buf);
355 }
356 
357 static ssize_t
358 edd_show_legacy_max_head(struct edd_device *edev, char *buf)
359 {
360 	struct edd_info *info;
361 	char *p = buf;
362 	if (!edev)
363 		return -EINVAL;
364 	info = edd_dev_get_info(edev);
365 	if (!info || !buf)
366 		return -EINVAL;
367 
368 	p += snprintf(p, left, "%u\n", info->legacy_max_head);
369 	return (p - buf);
370 }
371 
372 static ssize_t
373 edd_show_legacy_sectors_per_track(struct edd_device *edev, char *buf)
374 {
375 	struct edd_info *info;
376 	char *p = buf;
377 	if (!edev)
378 		return -EINVAL;
379 	info = edd_dev_get_info(edev);
380 	if (!info || !buf)
381 		return -EINVAL;
382 
383 	p += snprintf(p, left, "%u\n", info->legacy_sectors_per_track);
384 	return (p - buf);
385 }
386 
387 static ssize_t
388 edd_show_default_cylinders(struct edd_device *edev, char *buf)
389 {
390 	struct edd_info *info;
391 	char *p = buf;
392 	if (!edev)
393 		return -EINVAL;
394 	info = edd_dev_get_info(edev);
395 	if (!info || !buf)
396 		return -EINVAL;
397 
398 	p += scnprintf(p, left, "%u\n", info->params.num_default_cylinders);
399 	return (p - buf);
400 }
401 
402 static ssize_t
403 edd_show_default_heads(struct edd_device *edev, char *buf)
404 {
405 	struct edd_info *info;
406 	char *p = buf;
407 	if (!edev)
408 		return -EINVAL;
409 	info = edd_dev_get_info(edev);
410 	if (!info || !buf)
411 		return -EINVAL;
412 
413 	p += scnprintf(p, left, "%u\n", info->params.num_default_heads);
414 	return (p - buf);
415 }
416 
417 static ssize_t
418 edd_show_default_sectors_per_track(struct edd_device *edev, char *buf)
419 {
420 	struct edd_info *info;
421 	char *p = buf;
422 	if (!edev)
423 		return -EINVAL;
424 	info = edd_dev_get_info(edev);
425 	if (!info || !buf)
426 		return -EINVAL;
427 
428 	p += scnprintf(p, left, "%u\n", info->params.sectors_per_track);
429 	return (p - buf);
430 }
431 
432 static ssize_t
433 edd_show_sectors(struct edd_device *edev, char *buf)
434 {
435 	struct edd_info *info;
436 	char *p = buf;
437 	if (!edev)
438 		return -EINVAL;
439 	info = edd_dev_get_info(edev);
440 	if (!info || !buf)
441 		return -EINVAL;
442 
443 	p += scnprintf(p, left, "%llu\n", info->params.number_of_sectors);
444 	return (p - buf);
445 }
446 
447 
448 /*
449  * Some device instances may not have all the above attributes,
450  * or the attribute values may be meaningless (i.e. if
451  * the device is < EDD 3.0, it won't have host_bus and interface
452  * information), so don't bother making files for them.  Likewise
453  * if the default_{cylinders,heads,sectors_per_track} values
454  * are zero, the BIOS doesn't provide sane values, don't bother
455  * creating files for them either.
456  */
457 
458 static int
459 edd_has_legacy_max_cylinder(struct edd_device *edev)
460 {
461 	struct edd_info *info;
462 	if (!edev)
463 		return 0;
464 	info = edd_dev_get_info(edev);
465 	if (!info)
466 		return 0;
467 	return info->legacy_max_cylinder > 0;
468 }
469 
470 static int
471 edd_has_legacy_max_head(struct edd_device *edev)
472 {
473 	struct edd_info *info;
474 	if (!edev)
475 		return 0;
476 	info = edd_dev_get_info(edev);
477 	if (!info)
478 		return 0;
479 	return info->legacy_max_head > 0;
480 }
481 
482 static int
483 edd_has_legacy_sectors_per_track(struct edd_device *edev)
484 {
485 	struct edd_info *info;
486 	if (!edev)
487 		return 0;
488 	info = edd_dev_get_info(edev);
489 	if (!info)
490 		return 0;
491 	return info->legacy_sectors_per_track > 0;
492 }
493 
494 static int
495 edd_has_default_cylinders(struct edd_device *edev)
496 {
497 	struct edd_info *info;
498 	if (!edev)
499 		return 0;
500 	info = edd_dev_get_info(edev);
501 	if (!info)
502 		return 0;
503 	return info->params.num_default_cylinders > 0;
504 }
505 
506 static int
507 edd_has_default_heads(struct edd_device *edev)
508 {
509 	struct edd_info *info;
510 	if (!edev)
511 		return 0;
512 	info = edd_dev_get_info(edev);
513 	if (!info)
514 		return 0;
515 	return info->params.num_default_heads > 0;
516 }
517 
518 static int
519 edd_has_default_sectors_per_track(struct edd_device *edev)
520 {
521 	struct edd_info *info;
522 	if (!edev)
523 		return 0;
524 	info = edd_dev_get_info(edev);
525 	if (!info)
526 		return 0;
527 	return info->params.sectors_per_track > 0;
528 }
529 
530 static int
531 edd_has_edd30(struct edd_device *edev)
532 {
533 	struct edd_info *info;
534 	int i;
535 	u8 csum = 0;
536 
537 	if (!edev)
538 		return 0;
539 	info = edd_dev_get_info(edev);
540 	if (!info)
541 		return 0;
542 
543 	if (!(info->params.key == 0xBEDD || info->params.key == 0xDDBE)) {
544 		return 0;
545 	}
546 
547 
548 	/* We support only T13 spec */
549 	if (info->params.device_path_info_length != 44)
550 		return 0;
551 
552 	for (i = 30; i < info->params.device_path_info_length + 30; i++)
553 		csum += *(((u8 *)&info->params) + i);
554 
555 	if (csum)
556 		return 0;
557 
558 	return 1;
559 }
560 
561 
562 static EDD_DEVICE_ATTR(raw_data, 0444, edd_show_raw_data, edd_has_edd_info);
563 static EDD_DEVICE_ATTR(version, 0444, edd_show_version, edd_has_edd_info);
564 static EDD_DEVICE_ATTR(extensions, 0444, edd_show_extensions, edd_has_edd_info);
565 static EDD_DEVICE_ATTR(info_flags, 0444, edd_show_info_flags, edd_has_edd_info);
566 static EDD_DEVICE_ATTR(sectors, 0444, edd_show_sectors, edd_has_edd_info);
567 static EDD_DEVICE_ATTR(legacy_max_cylinder, 0444,
568                        edd_show_legacy_max_cylinder,
569 		       edd_has_legacy_max_cylinder);
570 static EDD_DEVICE_ATTR(legacy_max_head, 0444, edd_show_legacy_max_head,
571 		       edd_has_legacy_max_head);
572 static EDD_DEVICE_ATTR(legacy_sectors_per_track, 0444,
573                        edd_show_legacy_sectors_per_track,
574 		       edd_has_legacy_sectors_per_track);
575 static EDD_DEVICE_ATTR(default_cylinders, 0444, edd_show_default_cylinders,
576 		       edd_has_default_cylinders);
577 static EDD_DEVICE_ATTR(default_heads, 0444, edd_show_default_heads,
578 		       edd_has_default_heads);
579 static EDD_DEVICE_ATTR(default_sectors_per_track, 0444,
580 		       edd_show_default_sectors_per_track,
581 		       edd_has_default_sectors_per_track);
582 static EDD_DEVICE_ATTR(interface, 0444, edd_show_interface, edd_has_edd30);
583 static EDD_DEVICE_ATTR(host_bus, 0444, edd_show_host_bus, edd_has_edd30);
584 static EDD_DEVICE_ATTR(mbr_signature, 0444, edd_show_mbr_signature, edd_has_mbr_signature);
585 
586 
587 /* These are default attributes that are added for every edd
588  * device discovered.  There are none.
589  */
590 static struct attribute * def_attrs[] = {
591 	NULL,
592 };
593 
594 /* These attributes are conditional and only added for some devices. */
595 static struct edd_attribute * edd_attrs[] = {
596 	&edd_attr_raw_data,
597 	&edd_attr_version,
598 	&edd_attr_extensions,
599 	&edd_attr_info_flags,
600 	&edd_attr_sectors,
601 	&edd_attr_legacy_max_cylinder,
602 	&edd_attr_legacy_max_head,
603 	&edd_attr_legacy_sectors_per_track,
604 	&edd_attr_default_cylinders,
605 	&edd_attr_default_heads,
606 	&edd_attr_default_sectors_per_track,
607 	&edd_attr_interface,
608 	&edd_attr_host_bus,
609 	&edd_attr_mbr_signature,
610 	NULL,
611 };
612 
613 /**
614  *	edd_release - free edd structure
615  *	@kobj:	kobject of edd structure
616  *
617  *	This is called when the refcount of the edd structure
618  *	reaches 0. This should happen right after we unregister,
619  *	but just in case, we use the release callback anyway.
620  */
621 
622 static void edd_release(struct kobject * kobj)
623 {
624 	struct edd_device * dev = to_edd_device(kobj);
625 	kfree(dev);
626 }
627 
628 static struct kobj_type edd_ktype = {
629 	.release	= edd_release,
630 	.sysfs_ops	= &edd_attr_ops,
631 	.default_attrs	= def_attrs,
632 };
633 
634 static struct kset *edd_kset;
635 
636 
637 /**
638  * edd_dev_is_type() - is this EDD device a 'type' device?
639  * @edev: target edd_device
640  * @type: a host bus or interface identifier string per the EDD spec
641  *
642  * Returns 1 (TRUE) if it is a 'type' device, 0 otherwise.
643  */
644 static int
645 edd_dev_is_type(struct edd_device *edev, const char *type)
646 {
647 	struct edd_info *info;
648 	if (!edev)
649 		return 0;
650 	info = edd_dev_get_info(edev);
651 
652 	if (type && info) {
653 		if (!strncmp(info->params.host_bus_type, type, strlen(type)) ||
654 		    !strncmp(info->params.interface_type, type, strlen(type)))
655 			return 1;
656 	}
657 	return 0;
658 }
659 
660 /**
661  * edd_get_pci_dev() - finds pci_dev that matches edev
662  * @edev: edd_device
663  *
664  * Returns pci_dev if found, or NULL
665  */
666 static struct pci_dev *
667 edd_get_pci_dev(struct edd_device *edev)
668 {
669 	struct edd_info *info = edd_dev_get_info(edev);
670 
671 	if (edd_dev_is_type(edev, "PCI") || edd_dev_is_type(edev, "XPRS")) {
672 		return pci_get_domain_bus_and_slot(0,
673 				info->params.interface_path.pci.bus,
674 				PCI_DEVFN(info->params.interface_path.pci.slot,
675 				info->params.interface_path.pci.function));
676 	}
677 	return NULL;
678 }
679 
680 static int
681 edd_create_symlink_to_pcidev(struct edd_device *edev)
682 {
683 
684 	struct pci_dev *pci_dev = edd_get_pci_dev(edev);
685 	int ret;
686 	if (!pci_dev)
687 		return 1;
688 	ret = sysfs_create_link(&edev->kobj,&pci_dev->dev.kobj,"pci_dev");
689 	pci_dev_put(pci_dev);
690 	return ret;
691 }
692 
693 static inline void
694 edd_device_unregister(struct edd_device *edev)
695 {
696 	kobject_put(&edev->kobj);
697 }
698 
699 static void edd_populate_dir(struct edd_device * edev)
700 {
701 	struct edd_attribute * attr;
702 	int error = 0;
703 	int i;
704 
705 	for (i = 0; (attr = edd_attrs[i]) && !error; i++) {
706 		if (!attr->test ||
707 		    (attr->test && attr->test(edev)))
708 			error = sysfs_create_file(&edev->kobj,&attr->attr);
709 	}
710 
711 	if (!error) {
712 		edd_create_symlink_to_pcidev(edev);
713 	}
714 }
715 
716 static int
717 edd_device_register(struct edd_device *edev, int i)
718 {
719 	int error;
720 
721 	if (!edev)
722 		return 1;
723 	edd_dev_set_info(edev, i);
724 	edev->kobj.kset = edd_kset;
725 	error = kobject_init_and_add(&edev->kobj, &edd_ktype, NULL,
726 				     "int13_dev%02x", 0x80 + i);
727 	if (!error) {
728 		edd_populate_dir(edev);
729 		kobject_uevent(&edev->kobj, KOBJ_ADD);
730 	}
731 	return error;
732 }
733 
734 static inline int edd_num_devices(void)
735 {
736 	return max_t(unsigned char,
737 		     min_t(unsigned char, EDD_MBR_SIG_MAX, edd.mbr_signature_nr),
738 		     min_t(unsigned char, EDDMAXNR, edd.edd_info_nr));
739 }
740 
741 /**
742  * edd_init() - creates sysfs tree of EDD data
743  */
744 static int __init
745 edd_init(void)
746 {
747 	int i;
748 	int rc=0;
749 	struct edd_device *edev;
750 
751 	printk(KERN_INFO "BIOS EDD facility v%s %s, %d devices found\n",
752 	       EDD_VERSION, EDD_DATE, edd_num_devices());
753 
754 	if (!edd_num_devices()) {
755 		printk(KERN_INFO "EDD information not available.\n");
756 		return -ENODEV;
757 	}
758 
759 	edd_kset = kset_create_and_add("edd", NULL, firmware_kobj);
760 	if (!edd_kset)
761 		return -ENOMEM;
762 
763 	for (i = 0; i < edd_num_devices(); i++) {
764 		edev = kzalloc(sizeof (*edev), GFP_KERNEL);
765 		if (!edev) {
766 			rc = -ENOMEM;
767 			goto out;
768 		}
769 
770 		rc = edd_device_register(edev, i);
771 		if (rc) {
772 			kfree(edev);
773 			goto out;
774 		}
775 		edd_devices[i] = edev;
776 	}
777 
778 	return 0;
779 
780 out:
781 	while (--i >= 0)
782 		edd_device_unregister(edd_devices[i]);
783 	kset_unregister(edd_kset);
784 	return rc;
785 }
786 
787 static void __exit
788 edd_exit(void)
789 {
790 	int i;
791 	struct edd_device *edev;
792 
793 	for (i = 0; i < edd_num_devices(); i++) {
794 		if ((edev = edd_devices[i]))
795 			edd_device_unregister(edev);
796 	}
797 	kset_unregister(edd_kset);
798 }
799 
800 late_initcall(edd_init);
801 module_exit(edd_exit);
802