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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * linux/drivers/firmware/edd.c
0004  *  Copyright (C) 2002, 2003, 2004 Dell Inc.
0005  *  by Matt Domsch <Matt_Domsch@dell.com>
0006  *  disk signature by Matt Domsch, Andrew Wilks, and Sandeep K. Shandilya
0007  *  legacy CHS by Patrick J. LoPresti <patl@users.sourceforge.net>
0008  *
0009  * BIOS Enhanced Disk Drive Services (EDD)
0010  * conformant to T13 Committee www.t13.org
0011  *   projects 1572D, 1484D, 1386D, 1226DT
0012  *
0013  * This code takes information provided by BIOS EDD calls
0014  * fn41 - Check Extensions Present and
0015  * fn48 - Get Device Parameters with EDD extensions
0016  * made in setup.S, copied to safe structures in setup.c,
0017  * and presents it in sysfs.
0018  *
0019  * Please see http://linux.dell.com/edd/results.html for
0020  * the list of BIOSs which have been reported to implement EDD.
0021  */
0022 
0023 #include <linux/module.h>
0024 #include <linux/string.h>
0025 #include <linux/types.h>
0026 #include <linux/init.h>
0027 #include <linux/stat.h>
0028 #include <linux/err.h>
0029 #include <linux/ctype.h>
0030 #include <linux/slab.h>
0031 #include <linux/limits.h>
0032 #include <linux/device.h>
0033 #include <linux/pci.h>
0034 #include <linux/blkdev.h>
0035 #include <linux/edd.h>
0036 
0037 #define EDD_VERSION "0.16"
0038 #define EDD_DATE    "2004-Jun-25"
0039 
0040 MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>");
0041 MODULE_DESCRIPTION("sysfs interface to BIOS EDD information");
0042 MODULE_LICENSE("GPL");
0043 MODULE_VERSION(EDD_VERSION);
0044 
0045 #define left (PAGE_SIZE - (p - buf) - 1)
0046 
0047 struct edd_device {
0048     unsigned int index;
0049     unsigned int mbr_signature;
0050     struct edd_info *info;
0051     struct kobject kobj;
0052 };
0053 
0054 struct edd_attribute {
0055     struct attribute attr;
0056     ssize_t(*show) (struct edd_device * edev, char *buf);
0057     int (*test) (struct edd_device * edev);
0058 };
0059 
0060 /* forward declarations */
0061 static int edd_dev_is_type(struct edd_device *edev, const char *type);
0062 static struct pci_dev *edd_get_pci_dev(struct edd_device *edev);
0063 
0064 static struct edd_device *edd_devices[EDD_MBR_SIG_MAX];
0065 
0066 #define EDD_DEVICE_ATTR(_name,_mode,_show,_test) \
0067 struct edd_attribute edd_attr_##_name = {   \
0068     .attr = {.name = __stringify(_name), .mode = _mode },   \
0069     .show   = _show,                \
0070     .test   = _test,                \
0071 };
0072 
0073 static int
0074 edd_has_mbr_signature(struct edd_device *edev)
0075 {
0076     return edev->index < min_t(unsigned char, edd.mbr_signature_nr, EDD_MBR_SIG_MAX);
0077 }
0078 
0079 static int
0080 edd_has_edd_info(struct edd_device *edev)
0081 {
0082     return edev->index < min_t(unsigned char, edd.edd_info_nr, EDDMAXNR);
0083 }
0084 
0085 static inline struct edd_info *
0086 edd_dev_get_info(struct edd_device *edev)
0087 {
0088     return edev->info;
0089 }
0090 
0091 static inline void
0092 edd_dev_set_info(struct edd_device *edev, int i)
0093 {
0094     edev->index = i;
0095     if (edd_has_mbr_signature(edev))
0096         edev->mbr_signature = edd.mbr_signature[i];
0097     if (edd_has_edd_info(edev))
0098         edev->info = &edd.edd_info[i];
0099 }
0100 
0101 #define to_edd_attr(_attr) container_of(_attr,struct edd_attribute,attr)
0102 #define to_edd_device(obj) container_of(obj,struct edd_device,kobj)
0103 
0104 static ssize_t
0105 edd_attr_show(struct kobject * kobj, struct attribute *attr, char *buf)
0106 {
0107     struct edd_device *dev = to_edd_device(kobj);
0108     struct edd_attribute *edd_attr = to_edd_attr(attr);
0109     ssize_t ret = -EIO;
0110 
0111     if (edd_attr->show)
0112         ret = edd_attr->show(dev, buf);
0113     return ret;
0114 }
0115 
0116 static const struct sysfs_ops edd_attr_ops = {
0117     .show = edd_attr_show,
0118 };
0119 
0120 static ssize_t
0121 edd_show_host_bus(struct edd_device *edev, char *buf)
0122 {
0123     struct edd_info *info;
0124     char *p = buf;
0125     int i;
0126 
0127     if (!edev)
0128         return -EINVAL;
0129     info = edd_dev_get_info(edev);
0130     if (!info || !buf)
0131         return -EINVAL;
0132 
0133     for (i = 0; i < 4; i++) {
0134         if (isprint(info->params.host_bus_type[i])) {
0135             p += scnprintf(p, left, "%c", info->params.host_bus_type[i]);
0136         } else {
0137             p += scnprintf(p, left, " ");
0138         }
0139     }
0140 
0141     if (!strncmp(info->params.host_bus_type, "ISA", 3)) {
0142         p += scnprintf(p, left, "\tbase_address: %x\n",
0143                  info->params.interface_path.isa.base_address);
0144     } else if (!strncmp(info->params.host_bus_type, "PCIX", 4) ||
0145            !strncmp(info->params.host_bus_type, "PCI", 3) ||
0146            !strncmp(info->params.host_bus_type, "XPRS", 4)) {
0147         p += scnprintf(p, left,
0148                  "\t%02x:%02x.%d  channel: %u\n",
0149                  info->params.interface_path.pci.bus,
0150                  info->params.interface_path.pci.slot,
0151                  info->params.interface_path.pci.function,
0152                  info->params.interface_path.pci.channel);
0153     } else if (!strncmp(info->params.host_bus_type, "IBND", 4) ||
0154            !strncmp(info->params.host_bus_type, "HTPT", 4)) {
0155         p += scnprintf(p, left,
0156                  "\tTBD: %llx\n",
0157                  info->params.interface_path.ibnd.reserved);
0158 
0159     } else {
0160         p += scnprintf(p, left, "\tunknown: %llx\n",
0161                  info->params.interface_path.unknown.reserved);
0162     }
0163     return (p - buf);
0164 }
0165 
0166 static ssize_t
0167 edd_show_interface(struct edd_device *edev, char *buf)
0168 {
0169     struct edd_info *info;
0170     char *p = buf;
0171     int i;
0172 
0173     if (!edev)
0174         return -EINVAL;
0175     info = edd_dev_get_info(edev);
0176     if (!info || !buf)
0177         return -EINVAL;
0178 
0179     for (i = 0; i < 8; i++) {
0180         if (isprint(info->params.interface_type[i])) {
0181             p += scnprintf(p, left, "%c", info->params.interface_type[i]);
0182         } else {
0183             p += scnprintf(p, left, " ");
0184         }
0185     }
0186     if (!strncmp(info->params.interface_type, "ATAPI", 5)) {
0187         p += scnprintf(p, left, "\tdevice: %u  lun: %u\n",
0188                  info->params.device_path.atapi.device,
0189                  info->params.device_path.atapi.lun);
0190     } else if (!strncmp(info->params.interface_type, "ATA", 3)) {
0191         p += scnprintf(p, left, "\tdevice: %u\n",
0192                  info->params.device_path.ata.device);
0193     } else if (!strncmp(info->params.interface_type, "SCSI", 4)) {
0194         p += scnprintf(p, left, "\tid: %u  lun: %llu\n",
0195                  info->params.device_path.scsi.id,
0196                  info->params.device_path.scsi.lun);
0197     } else if (!strncmp(info->params.interface_type, "USB", 3)) {
0198         p += scnprintf(p, left, "\tserial_number: %llx\n",
0199                  info->params.device_path.usb.serial_number);
0200     } else if (!strncmp(info->params.interface_type, "1394", 4)) {
0201         p += scnprintf(p, left, "\teui: %llx\n",
0202                  info->params.device_path.i1394.eui);
0203     } else if (!strncmp(info->params.interface_type, "FIBRE", 5)) {
0204         p += scnprintf(p, left, "\twwid: %llx lun: %llx\n",
0205                  info->params.device_path.fibre.wwid,
0206                  info->params.device_path.fibre.lun);
0207     } else if (!strncmp(info->params.interface_type, "I2O", 3)) {
0208         p += scnprintf(p, left, "\tidentity_tag: %llx\n",
0209                  info->params.device_path.i2o.identity_tag);
0210     } else if (!strncmp(info->params.interface_type, "RAID", 4)) {
0211         p += scnprintf(p, left, "\tidentity_tag: %x\n",
0212                  info->params.device_path.raid.array_number);
0213     } else if (!strncmp(info->params.interface_type, "SATA", 4)) {
0214         p += scnprintf(p, left, "\tdevice: %u\n",
0215                  info->params.device_path.sata.device);
0216     } else {
0217         p += scnprintf(p, left, "\tunknown: %llx %llx\n",
0218                  info->params.device_path.unknown.reserved1,
0219                  info->params.device_path.unknown.reserved2);
0220     }
0221 
0222     return (p - buf);
0223 }
0224 
0225 /**
0226  * edd_show_raw_data() - copies raw data to buffer for userspace to parse
0227  * @edev: target edd_device
0228  * @buf: output buffer
0229  *
0230  * Returns: number of bytes written, or -EINVAL on failure
0231  */
0232 static ssize_t
0233 edd_show_raw_data(struct edd_device *edev, char *buf)
0234 {
0235     struct edd_info *info;
0236     ssize_t len = sizeof (info->params);
0237     if (!edev)
0238         return -EINVAL;
0239     info = edd_dev_get_info(edev);
0240     if (!info || !buf)
0241         return -EINVAL;
0242 
0243     if (!(info->params.key == 0xBEDD || info->params.key == 0xDDBE))
0244         len = info->params.length;
0245 
0246     /* In case of buggy BIOSs */
0247     if (len > (sizeof(info->params)))
0248         len = sizeof(info->params);
0249 
0250     memcpy(buf, &info->params, len);
0251     return len;
0252 }
0253 
0254 static ssize_t
0255 edd_show_version(struct edd_device *edev, char *buf)
0256 {
0257     struct edd_info *info;
0258     char *p = buf;
0259     if (!edev)
0260         return -EINVAL;
0261     info = edd_dev_get_info(edev);
0262     if (!info || !buf)
0263         return -EINVAL;
0264 
0265     p += scnprintf(p, left, "0x%02x\n", info->version);
0266     return (p - buf);
0267 }
0268 
0269 static ssize_t
0270 edd_show_mbr_signature(struct edd_device *edev, char *buf)
0271 {
0272     char *p = buf;
0273     p += scnprintf(p, left, "0x%08x\n", edev->mbr_signature);
0274     return (p - buf);
0275 }
0276 
0277 static ssize_t
0278 edd_show_extensions(struct edd_device *edev, char *buf)
0279 {
0280     struct edd_info *info;
0281     char *p = buf;
0282     if (!edev)
0283         return -EINVAL;
0284     info = edd_dev_get_info(edev);
0285     if (!info || !buf)
0286         return -EINVAL;
0287 
0288     if (info->interface_support & EDD_EXT_FIXED_DISK_ACCESS) {
0289         p += scnprintf(p, left, "Fixed disk access\n");
0290     }
0291     if (info->interface_support & EDD_EXT_DEVICE_LOCKING_AND_EJECTING) {
0292         p += scnprintf(p, left, "Device locking and ejecting\n");
0293     }
0294     if (info->interface_support & EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT) {
0295         p += scnprintf(p, left, "Enhanced Disk Drive support\n");
0296     }
0297     if (info->interface_support & EDD_EXT_64BIT_EXTENSIONS) {
0298         p += scnprintf(p, left, "64-bit extensions\n");
0299     }
0300     return (p - buf);
0301 }
0302 
0303 static ssize_t
0304 edd_show_info_flags(struct edd_device *edev, char *buf)
0305 {
0306     struct edd_info *info;
0307     char *p = buf;
0308     if (!edev)
0309         return -EINVAL;
0310     info = edd_dev_get_info(edev);
0311     if (!info || !buf)
0312         return -EINVAL;
0313 
0314     if (info->params.info_flags & EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT)
0315         p += scnprintf(p, left, "DMA boundary error transparent\n");
0316     if (info->params.info_flags & EDD_INFO_GEOMETRY_VALID)
0317         p += scnprintf(p, left, "geometry valid\n");
0318     if (info->params.info_flags & EDD_INFO_REMOVABLE)
0319         p += scnprintf(p, left, "removable\n");
0320     if (info->params.info_flags & EDD_INFO_WRITE_VERIFY)
0321         p += scnprintf(p, left, "write verify\n");
0322     if (info->params.info_flags & EDD_INFO_MEDIA_CHANGE_NOTIFICATION)
0323         p += scnprintf(p, left, "media change notification\n");
0324     if (info->params.info_flags & EDD_INFO_LOCKABLE)
0325         p += scnprintf(p, left, "lockable\n");
0326     if (info->params.info_flags & EDD_INFO_NO_MEDIA_PRESENT)
0327         p += scnprintf(p, left, "no media present\n");
0328     if (info->params.info_flags & EDD_INFO_USE_INT13_FN50)
0329         p += scnprintf(p, left, "use int13 fn50\n");
0330     return (p - buf);
0331 }
0332 
0333 static ssize_t
0334 edd_show_legacy_max_cylinder(struct edd_device *edev, char *buf)
0335 {
0336     struct edd_info *info;
0337     char *p = buf;
0338     if (!edev)
0339         return -EINVAL;
0340     info = edd_dev_get_info(edev);
0341     if (!info || !buf)
0342         return -EINVAL;
0343 
0344     p += scnprintf(p, left, "%u\n", info->legacy_max_cylinder);
0345     return (p - buf);
0346 }
0347 
0348 static ssize_t
0349 edd_show_legacy_max_head(struct edd_device *edev, char *buf)
0350 {
0351     struct edd_info *info;
0352     char *p = buf;
0353     if (!edev)
0354         return -EINVAL;
0355     info = edd_dev_get_info(edev);
0356     if (!info || !buf)
0357         return -EINVAL;
0358 
0359     p += scnprintf(p, left, "%u\n", info->legacy_max_head);
0360     return (p - buf);
0361 }
0362 
0363 static ssize_t
0364 edd_show_legacy_sectors_per_track(struct edd_device *edev, char *buf)
0365 {
0366     struct edd_info *info;
0367     char *p = buf;
0368     if (!edev)
0369         return -EINVAL;
0370     info = edd_dev_get_info(edev);
0371     if (!info || !buf)
0372         return -EINVAL;
0373 
0374     p += scnprintf(p, left, "%u\n", info->legacy_sectors_per_track);
0375     return (p - buf);
0376 }
0377 
0378 static ssize_t
0379 edd_show_default_cylinders(struct edd_device *edev, char *buf)
0380 {
0381     struct edd_info *info;
0382     char *p = buf;
0383     if (!edev)
0384         return -EINVAL;
0385     info = edd_dev_get_info(edev);
0386     if (!info || !buf)
0387         return -EINVAL;
0388 
0389     p += scnprintf(p, left, "%u\n", info->params.num_default_cylinders);
0390     return (p - buf);
0391 }
0392 
0393 static ssize_t
0394 edd_show_default_heads(struct edd_device *edev, char *buf)
0395 {
0396     struct edd_info *info;
0397     char *p = buf;
0398     if (!edev)
0399         return -EINVAL;
0400     info = edd_dev_get_info(edev);
0401     if (!info || !buf)
0402         return -EINVAL;
0403 
0404     p += scnprintf(p, left, "%u\n", info->params.num_default_heads);
0405     return (p - buf);
0406 }
0407 
0408 static ssize_t
0409 edd_show_default_sectors_per_track(struct edd_device *edev, char *buf)
0410 {
0411     struct edd_info *info;
0412     char *p = buf;
0413     if (!edev)
0414         return -EINVAL;
0415     info = edd_dev_get_info(edev);
0416     if (!info || !buf)
0417         return -EINVAL;
0418 
0419     p += scnprintf(p, left, "%u\n", info->params.sectors_per_track);
0420     return (p - buf);
0421 }
0422 
0423 static ssize_t
0424 edd_show_sectors(struct edd_device *edev, char *buf)
0425 {
0426     struct edd_info *info;
0427     char *p = buf;
0428     if (!edev)
0429         return -EINVAL;
0430     info = edd_dev_get_info(edev);
0431     if (!info || !buf)
0432         return -EINVAL;
0433 
0434     p += scnprintf(p, left, "%llu\n", info->params.number_of_sectors);
0435     return (p - buf);
0436 }
0437 
0438 
0439 /*
0440  * Some device instances may not have all the above attributes,
0441  * or the attribute values may be meaningless (i.e. if
0442  * the device is < EDD 3.0, it won't have host_bus and interface
0443  * information), so don't bother making files for them.  Likewise
0444  * if the default_{cylinders,heads,sectors_per_track} values
0445  * are zero, the BIOS doesn't provide sane values, don't bother
0446  * creating files for them either.
0447  */
0448 
0449 static int
0450 edd_has_legacy_max_cylinder(struct edd_device *edev)
0451 {
0452     struct edd_info *info;
0453     if (!edev)
0454         return 0;
0455     info = edd_dev_get_info(edev);
0456     if (!info)
0457         return 0;
0458     return info->legacy_max_cylinder > 0;
0459 }
0460 
0461 static int
0462 edd_has_legacy_max_head(struct edd_device *edev)
0463 {
0464     struct edd_info *info;
0465     if (!edev)
0466         return 0;
0467     info = edd_dev_get_info(edev);
0468     if (!info)
0469         return 0;
0470     return info->legacy_max_head > 0;
0471 }
0472 
0473 static int
0474 edd_has_legacy_sectors_per_track(struct edd_device *edev)
0475 {
0476     struct edd_info *info;
0477     if (!edev)
0478         return 0;
0479     info = edd_dev_get_info(edev);
0480     if (!info)
0481         return 0;
0482     return info->legacy_sectors_per_track > 0;
0483 }
0484 
0485 static int
0486 edd_has_default_cylinders(struct edd_device *edev)
0487 {
0488     struct edd_info *info;
0489     if (!edev)
0490         return 0;
0491     info = edd_dev_get_info(edev);
0492     if (!info)
0493         return 0;
0494     return info->params.num_default_cylinders > 0;
0495 }
0496 
0497 static int
0498 edd_has_default_heads(struct edd_device *edev)
0499 {
0500     struct edd_info *info;
0501     if (!edev)
0502         return 0;
0503     info = edd_dev_get_info(edev);
0504     if (!info)
0505         return 0;
0506     return info->params.num_default_heads > 0;
0507 }
0508 
0509 static int
0510 edd_has_default_sectors_per_track(struct edd_device *edev)
0511 {
0512     struct edd_info *info;
0513     if (!edev)
0514         return 0;
0515     info = edd_dev_get_info(edev);
0516     if (!info)
0517         return 0;
0518     return info->params.sectors_per_track > 0;
0519 }
0520 
0521 static int
0522 edd_has_edd30(struct edd_device *edev)
0523 {
0524     struct edd_info *info;
0525     int i;
0526     u8 csum = 0;
0527 
0528     if (!edev)
0529         return 0;
0530     info = edd_dev_get_info(edev);
0531     if (!info)
0532         return 0;
0533 
0534     if (!(info->params.key == 0xBEDD || info->params.key == 0xDDBE)) {
0535         return 0;
0536     }
0537 
0538 
0539     /* We support only T13 spec */
0540     if (info->params.device_path_info_length != 44)
0541         return 0;
0542 
0543     for (i = 30; i < info->params.device_path_info_length + 30; i++)
0544         csum += *(((u8 *)&info->params) + i);
0545 
0546     if (csum)
0547         return 0;
0548 
0549     return 1;
0550 }
0551 
0552 
0553 static EDD_DEVICE_ATTR(raw_data, 0444, edd_show_raw_data, edd_has_edd_info);
0554 static EDD_DEVICE_ATTR(version, 0444, edd_show_version, edd_has_edd_info);
0555 static EDD_DEVICE_ATTR(extensions, 0444, edd_show_extensions, edd_has_edd_info);
0556 static EDD_DEVICE_ATTR(info_flags, 0444, edd_show_info_flags, edd_has_edd_info);
0557 static EDD_DEVICE_ATTR(sectors, 0444, edd_show_sectors, edd_has_edd_info);
0558 static EDD_DEVICE_ATTR(legacy_max_cylinder, 0444,
0559                        edd_show_legacy_max_cylinder,
0560                edd_has_legacy_max_cylinder);
0561 static EDD_DEVICE_ATTR(legacy_max_head, 0444, edd_show_legacy_max_head,
0562                edd_has_legacy_max_head);
0563 static EDD_DEVICE_ATTR(legacy_sectors_per_track, 0444,
0564                        edd_show_legacy_sectors_per_track,
0565                edd_has_legacy_sectors_per_track);
0566 static EDD_DEVICE_ATTR(default_cylinders, 0444, edd_show_default_cylinders,
0567                edd_has_default_cylinders);
0568 static EDD_DEVICE_ATTR(default_heads, 0444, edd_show_default_heads,
0569                edd_has_default_heads);
0570 static EDD_DEVICE_ATTR(default_sectors_per_track, 0444,
0571                edd_show_default_sectors_per_track,
0572                edd_has_default_sectors_per_track);
0573 static EDD_DEVICE_ATTR(interface, 0444, edd_show_interface, edd_has_edd30);
0574 static EDD_DEVICE_ATTR(host_bus, 0444, edd_show_host_bus, edd_has_edd30);
0575 static EDD_DEVICE_ATTR(mbr_signature, 0444, edd_show_mbr_signature, edd_has_mbr_signature);
0576 
0577 /* These attributes are conditional and only added for some devices. */
0578 static struct edd_attribute * edd_attrs[] = {
0579     &edd_attr_raw_data,
0580     &edd_attr_version,
0581     &edd_attr_extensions,
0582     &edd_attr_info_flags,
0583     &edd_attr_sectors,
0584     &edd_attr_legacy_max_cylinder,
0585     &edd_attr_legacy_max_head,
0586     &edd_attr_legacy_sectors_per_track,
0587     &edd_attr_default_cylinders,
0588     &edd_attr_default_heads,
0589     &edd_attr_default_sectors_per_track,
0590     &edd_attr_interface,
0591     &edd_attr_host_bus,
0592     &edd_attr_mbr_signature,
0593     NULL,
0594 };
0595 
0596 /**
0597  *  edd_release - free edd structure
0598  *  @kobj:  kobject of edd structure
0599  *
0600  *  This is called when the refcount of the edd structure
0601  *  reaches 0. This should happen right after we unregister,
0602  *  but just in case, we use the release callback anyway.
0603  */
0604 
0605 static void edd_release(struct kobject * kobj)
0606 {
0607     struct edd_device * dev = to_edd_device(kobj);
0608     kfree(dev);
0609 }
0610 
0611 static struct kobj_type edd_ktype = {
0612     .release    = edd_release,
0613     .sysfs_ops  = &edd_attr_ops,
0614 };
0615 
0616 static struct kset *edd_kset;
0617 
0618 
0619 /**
0620  * edd_dev_is_type() - is this EDD device a 'type' device?
0621  * @edev: target edd_device
0622  * @type: a host bus or interface identifier string per the EDD spec
0623  *
0624  * Returns 1 (TRUE) if it is a 'type' device, 0 otherwise.
0625  */
0626 static int
0627 edd_dev_is_type(struct edd_device *edev, const char *type)
0628 {
0629     struct edd_info *info;
0630     if (!edev)
0631         return 0;
0632     info = edd_dev_get_info(edev);
0633 
0634     if (type && info) {
0635         if (!strncmp(info->params.host_bus_type, type, strlen(type)) ||
0636             !strncmp(info->params.interface_type, type, strlen(type)))
0637             return 1;
0638     }
0639     return 0;
0640 }
0641 
0642 /**
0643  * edd_get_pci_dev() - finds pci_dev that matches edev
0644  * @edev: edd_device
0645  *
0646  * Returns pci_dev if found, or NULL
0647  */
0648 static struct pci_dev *
0649 edd_get_pci_dev(struct edd_device *edev)
0650 {
0651     struct edd_info *info = edd_dev_get_info(edev);
0652 
0653     if (edd_dev_is_type(edev, "PCI") || edd_dev_is_type(edev, "XPRS")) {
0654         return pci_get_domain_bus_and_slot(0,
0655                 info->params.interface_path.pci.bus,
0656                 PCI_DEVFN(info->params.interface_path.pci.slot,
0657                 info->params.interface_path.pci.function));
0658     }
0659     return NULL;
0660 }
0661 
0662 static int
0663 edd_create_symlink_to_pcidev(struct edd_device *edev)
0664 {
0665 
0666     struct pci_dev *pci_dev = edd_get_pci_dev(edev);
0667     int ret;
0668     if (!pci_dev)
0669         return 1;
0670     ret = sysfs_create_link(&edev->kobj,&pci_dev->dev.kobj,"pci_dev");
0671     pci_dev_put(pci_dev);
0672     return ret;
0673 }
0674 
0675 static inline void
0676 edd_device_unregister(struct edd_device *edev)
0677 {
0678     kobject_put(&edev->kobj);
0679 }
0680 
0681 static void edd_populate_dir(struct edd_device * edev)
0682 {
0683     struct edd_attribute * attr;
0684     int error = 0;
0685     int i;
0686 
0687     for (i = 0; (attr = edd_attrs[i]) && !error; i++) {
0688         if (!attr->test || attr->test(edev))
0689             error = sysfs_create_file(&edev->kobj,&attr->attr);
0690     }
0691 
0692     if (!error) {
0693         edd_create_symlink_to_pcidev(edev);
0694     }
0695 }
0696 
0697 static int
0698 edd_device_register(struct edd_device *edev, int i)
0699 {
0700     int error;
0701 
0702     if (!edev)
0703         return 1;
0704     edd_dev_set_info(edev, i);
0705     edev->kobj.kset = edd_kset;
0706     error = kobject_init_and_add(&edev->kobj, &edd_ktype, NULL,
0707                      "int13_dev%02x", 0x80 + i);
0708     if (!error) {
0709         edd_populate_dir(edev);
0710         kobject_uevent(&edev->kobj, KOBJ_ADD);
0711     }
0712     return error;
0713 }
0714 
0715 static inline int edd_num_devices(void)
0716 {
0717     return max_t(unsigned char,
0718              min_t(unsigned char, EDD_MBR_SIG_MAX, edd.mbr_signature_nr),
0719              min_t(unsigned char, EDDMAXNR, edd.edd_info_nr));
0720 }
0721 
0722 /**
0723  * edd_init() - creates sysfs tree of EDD data
0724  */
0725 static int __init
0726 edd_init(void)
0727 {
0728     int i;
0729     int rc=0;
0730     struct edd_device *edev;
0731 
0732     if (!edd_num_devices())
0733         return -ENODEV;
0734 
0735     printk(KERN_INFO "BIOS EDD facility v%s %s, %d devices found\n",
0736            EDD_VERSION, EDD_DATE, edd_num_devices());
0737 
0738     edd_kset = kset_create_and_add("edd", NULL, firmware_kobj);
0739     if (!edd_kset)
0740         return -ENOMEM;
0741 
0742     for (i = 0; i < edd_num_devices(); i++) {
0743         edev = kzalloc(sizeof (*edev), GFP_KERNEL);
0744         if (!edev) {
0745             rc = -ENOMEM;
0746             goto out;
0747         }
0748 
0749         rc = edd_device_register(edev, i);
0750         if (rc) {
0751             kfree(edev);
0752             goto out;
0753         }
0754         edd_devices[i] = edev;
0755     }
0756 
0757     return 0;
0758 
0759 out:
0760     while (--i >= 0)
0761         edd_device_unregister(edd_devices[i]);
0762     kset_unregister(edd_kset);
0763     return rc;
0764 }
0765 
0766 static void __exit
0767 edd_exit(void)
0768 {
0769     int i;
0770     struct edd_device *edev;
0771 
0772     for (i = 0; i < edd_num_devices(); i++) {
0773         if ((edev = edd_devices[i]))
0774             edd_device_unregister(edev);
0775     }
0776     kset_unregister(edd_kset);
0777 }
0778 
0779 late_initcall(edd_init);
0780 module_exit(edd_exit);
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