// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/drivers/firmware/edd.c
* Copyright (C) 2002, 2003, 2004 Dell Inc.
* by Matt Domsch <[email protected]>
* disk signature by Matt Domsch, Andrew Wilks, and Sandeep K. Shandilya
* legacy CHS by Patrick J. LoPresti <[email protected]>
*
* BIOS Enhanced Disk Drive Services (EDD)
* conformant to T13 Committee www.t13.org
* projects 1572D, 1484D, 1386D, 1226DT
*
* This code takes information provided by BIOS EDD calls
* fn41 - Check Extensions Present and
* fn48 - Get Device Parameters with EDD extensions
* made in setup.S, copied to safe structures in setup.c,
* and presents it in sysfs.
*
* Please see http://linux.dell.com/edd/results.html for
* the list of BIOSs which have been reported to implement EDD.
*/
#include <linux/module.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/stat.h>
#include <linux/err.h>
#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/limits.h>
#include <linux/device.h>
#include <linux/pci.h>
#include <linux/blkdev.h>
#include <linux/edd.h>
#define EDD_VERSION "0.16"
#define EDD_DATE "2004-Jun-25"
MODULE_AUTHOR("Matt Domsch <[email protected]>");
MODULE_DESCRIPTION("sysfs interface to BIOS EDD information");
MODULE_LICENSE("GPL");
MODULE_VERSION(EDD_VERSION);
#define left (PAGE_SIZE - (p - buf) - 1)
struct edd_device {
unsigned int index;
unsigned int mbr_signature;
struct edd_info *info;
struct kobject kobj;
};
struct edd_attribute {
struct attribute attr;
ssize_t(*show) (struct edd_device * edev, char *buf);
int (*test) (struct edd_device * edev);
};
/* forward declarations */
static int edd_dev_is_type(struct edd_device *edev, const char *type);
static struct pci_dev *edd_get_pci_dev(struct edd_device *edev);
static struct edd_device *edd_devices[EDD_MBR_SIG_MAX];
#define EDD_DEVICE_ATTR(_name,_mode,_show,_test) \
struct edd_attribute edd_attr_##_name = { \
.attr = {.name = __stringify(_name), .mode = _mode }, \
.show = _show, \
.test = _test, \
};
static int
edd_has_mbr_signature(struct edd_device *edev)
{
return edev->index < min_t(unsigned char, edd.mbr_signature_nr, EDD_MBR_SIG_MAX);
}
static int
edd_has_edd_info(struct edd_device *edev)
{
return edev->index < min_t(unsigned char, edd.edd_info_nr, EDDMAXNR);
}
static inline struct edd_info *
edd_dev_get_info(struct edd_device *edev)
{
return edev->info;
}
static inline void
edd_dev_set_info(struct edd_device *edev, int i)
{
edev->index = i;
if (edd_has_mbr_signature(edev))
edev->mbr_signature = edd.mbr_signature[i];
if (edd_has_edd_info(edev))
edev->info = &edd.edd_info[i];
}
#define to_edd_attr(_attr) container_of(_attr,struct edd_attribute,attr)
#define to_edd_device(obj) container_of(obj,struct edd_device,kobj)
static ssize_t
edd_attr_show(struct kobject * kobj, struct attribute *attr, char *buf)
{
struct edd_device *dev = to_edd_device(kobj);
struct edd_attribute *edd_attr = to_edd_attr(attr);
ssize_t ret = -EIO;
if (edd_attr->show)
ret = edd_attr->show(dev, buf);
return ret;
}
static const struct sysfs_ops edd_attr_ops = {
.show = edd_attr_show,
};
static ssize_t
edd_show_host_bus(struct edd_device *edev, char *buf)
{
struct edd_info *info;
char *p = buf;
int i;
if (!edev)
return -EINVAL;
info = edd_dev_get_info(edev);
if (!info || !buf)
return -EINVAL;
for (i = 0; i < 4; i++) {
if (isprint(info->params.host_bus_type[i])) {
p += scnprintf(p, left, "%c", info->params.host_bus_type[i]);
} else {
p += scnprintf(p, left, " ");
}
}
if (!strncmp(info->params.host_bus_type, "ISA", 3)) {
p += scnprintf(p, left, "\tbase_address: %x\n",
info->params.interface_path.isa.base_address);
} else if (!strncmp(info->params.host_bus_type, "PCIX", 4) ||
!strncmp(info->params.host_bus_type, "PCI", 3) ||
!strncmp(info->params.host_bus_type, "XPRS", 4)) {
p += scnprintf(p, left,
"\t%02x:%02x.%d channel: %u\n",
info->params.interface_path.pci.bus,
info->params.interface_path.pci.slot,
info->params.interface_path.pci.function,
info->params.interface_path.pci.channel);
} else if (!strncmp(info->params.host_bus_type, "IBND", 4) ||
!strncmp(info->params.host_bus_type, "HTPT", 4)) {
p += scnprintf(p, left,
"\tTBD: %llx\n",
info->params.interface_path.ibnd.reserved);
} else {
p += scnprintf(p, left, "\tunknown: %llx\n",
info->params.interface_path.unknown.reserved);
}
return (p - buf);
}
static ssize_t
edd_show_interface(struct edd_device *edev, char *buf)
{
struct edd_info *info;
char *p = buf;
int i;
if (!edev)
return -EINVAL;
info = edd_dev_get_info(edev);
if (!info || !buf)
return -EINVAL;
for (i = 0; i < 8; i++) {
if (isprint(info->params.interface_type[i])) {
p += scnprintf(p, left, "%c", info->params.interface_type[i]);
} else {
p += scnprintf(p, left, " ");
}
}
if (!strncmp(info->params.interface_type, "ATAPI", 5)) {
p += scnprintf(p, left, "\tdevice: %u lun: %u\n",
info->params.device_path.atapi.device,
info->params.device_path.atapi.lun);
} else if (!strncmp(info->params.interface_type, "ATA", 3)) {
p += scnprintf(p, left, "\tdevice: %u\n",
info->params.device_path.ata.device);
} else if (!strncmp(info->params.interface_type, "SCSI", 4)) {
p += scnprintf(p, left, "\tid: %u lun: %llu\n",
info->params.device_path.scsi.id,
info->params.device_path.scsi.lun);
} else if (!strncmp(info->params.interface_type, "USB", 3)) {
p += scnprintf(p, left, "\tserial_number: %llx\n",
info->params.device_path.usb.serial_number);
} else if (!strncmp(info->params.interface_type, "1394", 4)) {
p += scnprintf(p, left, "\teui: %llx\n",
info->params.device_path.i1394.eui);
} else if (!strncmp(info->params.interface_type, "FIBRE", 5)) {
p += scnprintf(p, left, "\twwid: %llx lun: %llx\n",
info->params.device_path.fibre.wwid,
info->params.device_path.fibre.lun);
} else if (!strncmp(info->params.interface_type, "I2O", 3)) {
p += scnprintf(p, left, "\tidentity_tag: %llx\n",
info->params.device_path.i2o.identity_tag);
} else if (!strncmp(info->params.interface_type, "RAID", 4)) {
p += scnprintf(p, left, "\tidentity_tag: %x\n",
info->params.device_path.raid.array_number);
} else if (!strncmp(info->params.interface_type, "SATA", 4)) {
p += scnprintf(p, left, "\tdevice: %u\n",
info->params.device_path.sata.device);
} else {
p += scnprintf(p, left, "\tunknown: %llx %llx\n",
info->params.device_path.unknown.reserved1,
info->params.device_path.unknown.reserved2);
}
return (p - buf);
}
/**
* edd_show_raw_data() - copies raw data to buffer for userspace to parse
* @edev: target edd_device
* @buf: output buffer
*
* Returns: number of bytes written, or -EINVAL on failure
*/
static ssize_t
edd_show_raw_data(struct edd_device *edev, char *buf)
{
struct edd_info *info;
ssize_t len = sizeof (info->params);
if (!edev)
return -EINVAL;
info = edd_dev_get_info(edev);
if (!info || !buf)
return -EINVAL;
if (!(info->params.key == 0xBEDD || info->params.key == 0xDDBE))
len = info->params.length;
/* In case of buggy BIOSs */
if (len > (sizeof(info->params)))
len = sizeof(info->params);
memcpy(buf, &info->params, len);
return len;
}
static ssize_t
edd_show_version(struct edd_device *edev, char *buf)
{
struct edd_info *info;
char *p = buf;
if (!edev)
return -EINVAL;
info = edd_dev_get_info(edev);
if (!info || !buf)
return -EINVAL;
p += scnprintf(p, left, "0x%02x\n", info->version);
return (p - buf);
}
static ssize_t
edd_show_mbr_signature(struct edd_device *edev, char *buf)
{
char *p = buf;
p += scnprintf(p, left, "0x%08x\n", edev->mbr_signature);
return (p - buf);
}
static ssize_t
edd_show_extensions(struct edd_device *edev, char *buf)
{
struct edd_info *info;
char *p = buf;
if (!edev)
return -EINVAL;
info = edd_dev_get_info(edev);
if (!info || !buf)
return -EINVAL;
if (info->interface_support & EDD_EXT_FIXED_DISK_ACCESS) {
p += scnprintf(p, left, "Fixed disk access\n");
}
if (info->interface_support & EDD_EXT_DEVICE_LOCKING_AND_EJECTING) {
p += scnprintf(p, left, "Device locking and ejecting\n");
}
if (info->interface_support & EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT) {
p += scnprintf(p, left, "Enhanced Disk Drive support\n");
}
if (info->interface_support & EDD_EXT_64BIT_EXTENSIONS) {
p += scnprintf(p, left, "64-bit extensions\n");
}
return (p - buf);
}
static ssize_t
edd_show_info_flags(struct edd_device *edev, char *buf)
{
struct edd_info *info;
char *p = buf;
if (!edev)
return -EINVAL;
info = edd_dev_get_info(edev);
if (!info || !buf)
return -EINVAL;
if (info->params.info_flags & EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT)
p += scnprintf(p, left, "DMA boundary error transparent\n");
if (info->params.info_flags & EDD_INFO_GEOMETRY_VALID)
p += scnprintf(p, left, "geometry valid\n");
if (info->params.info_flags & EDD_INFO_REMOVABLE)
p += scnprintf(p, left, "removable\n");
if (info->params.info_flags & EDD_INFO_WRITE_VERIFY)
p += scnprintf(p, left, "write verify\n");
if (info->params.info_flags & EDD_INFO_MEDIA_CHANGE_NOTIFICATION)
p += scnprintf(p, left, "media change notification\n");
if (info->params.info_flags & EDD_INFO_LOCKABLE)
p += scnprintf(p, left, "lockable\n");
if (info->params.info_flags & EDD_INFO_NO_MEDIA_PRESENT)
p += scnprintf(p, left, "no media present\n");
if (info->params.info_flags & EDD_INFO_USE_INT13_FN50)
p += scnprintf(p, left, "use int13 fn50\n");
return (p - buf);
}
static ssize_t
edd_show_legacy_max_cylinder(struct edd_device *edev, char *buf)
{
struct edd_info *info;
char *p = buf;
if (!edev)
return -EINVAL;
info = edd_dev_get_info(edev);
if (!info || !buf)
return -EINVAL;
p += scnprintf(p, left, "%u\n", info->legacy_max_cylinder);
return (p - buf);
}
static ssize_t
edd_show_legacy_max_head(struct edd_device *edev, char *buf)
{
struct edd_info *info;
char *p = buf;
if (!edev)
return -EINVAL;
info = edd_dev_get_info(edev);
if (!info || !buf)
return -EINVAL;
p += scnprintf(p, left, "%u\n", info->legacy_max_head);
return (p - buf);
}
static ssize_t
edd_show_legacy_sectors_per_track(struct edd_device *edev, char *buf)
{
struct edd_info *info;
char *p = buf;
if (!edev)
return -EINVAL;
info = edd_dev_get_info(edev);
if (!info || !buf)
return -EINVAL;
p += scnprintf(p, left, "%u\n", info->legacy_sectors_per_track);
return (p - buf);
}
static ssize_t
edd_show_default_cylinders(struct edd_device *edev, char *buf)
{
struct edd_info *info;
char *p = buf;
if (!edev)
return -EINVAL;
info = edd_dev_get_info(edev);
if (!info || !buf)
return -EINVAL;
p += scnprintf(p, left, "%u\n", info->params.num_default_cylinders);
return (p - buf);
}
static ssize_t
edd_show_default_heads(struct edd_device *edev, char *buf)
{
struct edd_info *info;
char *p = buf;
if (!edev)
return -EINVAL;
info = edd_dev_get_info(edev);
if (!info || !buf)
return -EINVAL;
p += scnprintf(p, left, "%u\n", info->params.num_default_heads);
return (p - buf);
}
static ssize_t
edd_show_default_sectors_per_track(struct edd_device *edev, char *buf)
{
struct edd_info *info;
char *p = buf;
if (!edev)
return -EINVAL;
info = edd_dev_get_info(edev);
if (!info || !buf)
return -EINVAL;
p += scnprintf(p, left, "%u\n", info->params.sectors_per_track);
return (p - buf);
}
static ssize_t
edd_show_sectors(struct edd_device *edev, char *buf)
{
struct edd_info *info;
char *p = buf;
if (!edev)
return -EINVAL;
info = edd_dev_get_info(edev);
if (!info || !buf)
return -EINVAL;
p += scnprintf(p, left, "%llu\n", info->params.number_of_sectors);
return (p - buf);
}
/*
* Some device instances may not have all the above attributes,
* or the attribute values may be meaningless (i.e. if
* the device is < EDD 3.0, it won't have host_bus and interface
* information), so don't bother making files for them. Likewise
* if the default_{cylinders,heads,sectors_per_track} values
* are zero, the BIOS doesn't provide sane values, don't bother
* creating files for them either.
*/
static int
edd_has_legacy_max_cylinder(struct edd_device *edev)
{
struct edd_info *info;
if (!edev)
return 0;
info = edd_dev_get_info(edev);
if (!info)
return 0;
return info->legacy_max_cylinder > 0;
}
static int
edd_has_legacy_max_head(struct edd_device *edev)
{
struct edd_info *info;
if (!edev)
return 0;
info = edd_dev_get_info(edev);
if (!info)
return 0;
return info->legacy_max_head > 0;
}
static int
edd_has_legacy_sectors_per_track(struct edd_device *edev)
{
struct edd_info *info;
if (!edev)
return 0;
info = edd_dev_get_info(edev);
if (!info)
return 0;
return info->legacy_sectors_per_track > 0;
}
static int
edd_has_default_cylinders(struct edd_device *edev)
{
struct edd_info *info;
if (!edev)
return 0;
info = edd_dev_get_info(edev);
if (!info)
return 0;
return info->params.num_default_cylinders > 0;
}
static int
edd_has_default_heads(struct edd_device *edev)
{
struct edd_info *info;
if (!edev)
return 0;
info = edd_dev_get_info(edev);
if (!info)
return 0;
return info->params.num_default_heads > 0;
}
static int
edd_has_default_sectors_per_track(struct edd_device *edev)
{
struct edd_info *info;
if (!edev)
return 0;
info = edd_dev_get_info(edev);
if (!info)
return 0;
return info->params.sectors_per_track > 0;
}
static int
edd_has_edd30(struct edd_device *edev)
{
struct edd_info *info;
int i;
u8 csum = 0;
if (!edev)
return 0;
info = edd_dev_get_info(edev);
if (!info)
return 0;
if (!(info->params.key == 0xBEDD || info->params.key == 0xDDBE)) {
return 0;
}
/* We support only T13 spec */
if (info->params.device_path_info_length != 44)
return 0;
for (i = 30; i < info->params.device_path_info_length + 30; i++)
csum += *(((u8 *)&info->params) + i);
if (csum)
return 0;
return 1;
}
static EDD_DEVICE_ATTR(raw_data, 0444, edd_show_raw_data, edd_has_edd_info);
static EDD_DEVICE_ATTR(version, 0444, edd_show_version, edd_has_edd_info);
static EDD_DEVICE_ATTR(extensions, 0444, edd_show_extensions, edd_has_edd_info);
static EDD_DEVICE_ATTR(info_flags, 0444, edd_show_info_flags, edd_has_edd_info);
static EDD_DEVICE_ATTR(sectors, 0444, edd_show_sectors, edd_has_edd_info);
static EDD_DEVICE_ATTR(legacy_max_cylinder, 0444,
edd_show_legacy_max_cylinder,
edd_has_legacy_max_cylinder);
static EDD_DEVICE_ATTR(legacy_max_head, 0444, edd_show_legacy_max_head,
edd_has_legacy_max_head);
static EDD_DEVICE_ATTR(legacy_sectors_per_track, 0444,
edd_show_legacy_sectors_per_track,
edd_has_legacy_sectors_per_track);
static EDD_DEVICE_ATTR(default_cylinders, 0444, edd_show_default_cylinders,
edd_has_default_cylinders);
static EDD_DEVICE_ATTR(default_heads, 0444, edd_show_default_heads,
edd_has_default_heads);
static EDD_DEVICE_ATTR(default_sectors_per_track, 0444,
edd_show_default_sectors_per_track,
edd_has_default_sectors_per_track);
static EDD_DEVICE_ATTR(interface, 0444, edd_show_interface, edd_has_edd30);
static EDD_DEVICE_ATTR(host_bus, 0444, edd_show_host_bus, edd_has_edd30);
static EDD_DEVICE_ATTR(mbr_signature, 0444, edd_show_mbr_signature, edd_has_mbr_signature);
/* These attributes are conditional and only added for some devices. */
static struct edd_attribute * edd_attrs[] = {
&edd_attr_raw_data,
&edd_attr_version,
&edd_attr_extensions,
&edd_attr_info_flags,
&edd_attr_sectors,
&edd_attr_legacy_max_cylinder,
&edd_attr_legacy_max_head,
&edd_attr_legacy_sectors_per_track,
&edd_attr_default_cylinders,
&edd_attr_default_heads,
&edd_attr_default_sectors_per_track,
&edd_attr_interface,
&edd_attr_host_bus,
&edd_attr_mbr_signature,
NULL,
};
/**
* edd_release - free edd structure
* @kobj: kobject of edd structure
*
* This is called when the refcount of the edd structure
* reaches 0. This should happen right after we unregister,
* but just in case, we use the release callback anyway.
*/
static void edd_release(struct kobject * kobj)
{
struct edd_device * dev = to_edd_device(kobj);
kfree(dev);
}
static const struct kobj_type edd_ktype = {
.release = edd_release,
.sysfs_ops = &edd_attr_ops,
};
static struct kset *edd_kset;
/**
* edd_dev_is_type() - is this EDD device a 'type' device?
* @edev: target edd_device
* @type: a host bus or interface identifier string per the EDD spec
*
* Returns 1 (TRUE) if it is a 'type' device, 0 otherwise.
*/
static int
edd_dev_is_type(struct edd_device *edev, const char *type)
{
struct edd_info *info;
if (!edev)
return 0;
info = edd_dev_get_info(edev);
if (type && info) {
if (!strncmp(info->params.host_bus_type, type, strlen(type)) ||
!strncmp(info->params.interface_type, type, strlen(type)))
return 1;
}
return 0;
}
/**
* edd_get_pci_dev() - finds pci_dev that matches edev
* @edev: edd_device
*
* Returns pci_dev if found, or NULL
*/
static struct pci_dev *
edd_get_pci_dev(struct edd_device *edev)
{
struct edd_info *info = edd_dev_get_info(edev);
if (edd_dev_is_type(edev, "PCI") || edd_dev_is_type(edev, "XPRS")) {
return pci_get_domain_bus_and_slot(0,
info->params.interface_path.pci.bus,
PCI_DEVFN(info->params.interface_path.pci.slot,
info->params.interface_path.pci.function));
}
return NULL;
}
static int
edd_create_symlink_to_pcidev(struct edd_device *edev)
{
struct pci_dev *pci_dev = edd_get_pci_dev(edev);
int ret;
if (!pci_dev)
return 1;
ret = sysfs_create_link(&edev->kobj,&pci_dev->dev.kobj,"pci_dev");
pci_dev_put(pci_dev);
return ret;
}
static inline void
edd_device_unregister(struct edd_device *edev)
{
kobject_put(&edev->kobj);
}
static void edd_populate_dir(struct edd_device * edev)
{
struct edd_attribute * attr;
int error = 0;
int i;
for (i = 0; (attr = edd_attrs[i]) && !error; i++) {
if (!attr->test || attr->test(edev))
error = sysfs_create_file(&edev->kobj,&attr->attr);
}
if (!error) {
edd_create_symlink_to_pcidev(edev);
}
}
static int
edd_device_register(struct edd_device *edev, int i)
{
int error;
if (!edev)
return 1;
edd_dev_set_info(edev, i);
edev->kobj.kset = edd_kset;
error = kobject_init_and_add(&edev->kobj, &edd_ktype, NULL,
"int13_dev%02x", 0x80 + i);
if (!error) {
edd_populate_dir(edev);
kobject_uevent(&edev->kobj, KOBJ_ADD);
}
return error;
}
static inline int edd_num_devices(void)
{
return max_t(unsigned char,
min_t(unsigned char, EDD_MBR_SIG_MAX, edd.mbr_signature_nr),
min_t(unsigned char, EDDMAXNR, edd.edd_info_nr));
}
/**
* edd_init() - creates sysfs tree of EDD data
*/
static int __init
edd_init(void)
{
int i;
int rc=0;
struct edd_device *edev;
if (!edd_num_devices())
return -ENODEV;
printk(KERN_INFO "BIOS EDD facility v%s %s, %d devices found\n",
EDD_VERSION, EDD_DATE, edd_num_devices());
edd_kset = kset_create_and_add("edd", NULL, firmware_kobj);
if (!edd_kset)
return -ENOMEM;
for (i = 0; i < edd_num_devices(); i++) {
edev = kzalloc(sizeof (*edev), GFP_KERNEL);
if (!edev) {
rc = -ENOMEM;
goto out;
}
rc = edd_device_register(edev, i);
if (rc) {
kfree(edev);
goto out;
}
edd_devices[i] = edev;
}
return 0;
out:
while (--i >= 0)
edd_device_unregister(edd_devices[i]);
kset_unregister(edd_kset);
return rc;
}
static void __exit
edd_exit(void)
{
int i;
struct edd_device *edev;
for (i = 0; i < edd_num_devices(); i++) {
if ((edev = edd_devices[i]))
edd_device_unregister(edev);
}
kset_unregister(edd_kset);
}
late_initcall(edd_init);
module_exit(edd_exit);
Codebase Browser
linux