mirror of https://gitee.com/openkylin/linux.git
Merge branch 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86/efi changes from Peter Anvin: "The bulk of these changes are cleaning up the efivars handling and breaking it up into a tree of files. There are a number of fixes as well. The entire changeset is pretty big, but most of it is code movement. Several of these commits are quite new; the history got very messed up due to a mismerge with the urgent changes for rc8 which completely broke IA64, and so Ingo requested that we rebase it to straighten it out." * 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: efi: remove "kfree(NULL)" efi: locking fix in efivar_entry_set_safe() efi, pstore: Read data from variable store before memcpy() efi, pstore: Remove entry from list when erasing efi, pstore: Initialise 'entry' before iterating efi: split efisubsystem from efivars efivarfs: Move to fs/efivarfs efivars: Move pstore code into the new EFI directory efivars: efivar_entry API efivars: Keep a private global pointer to efivars efi: move utf16 string functions to efi.h x86, efi: Make efi_memblock_x86_reserve_range more readable efivarfs: convert to use simple_open()
This commit is contained in:
Linus Torvalds
commit
b9394d8a65
13
MAINTAINERS
13
MAINTAINERS
|
|
@ -3025,9 +3025,18 @@ F: arch/ia64/kernel/efi.c
|
|||
F: arch/x86/boot/compressed/eboot.[ch]
|
||||
F: arch/x86/include/asm/efi.h
|
||||
F: arch/x86/platform/efi/*
|
||||
F: drivers/firmware/efivars.c
|
||||
F: drivers/firmware/efi/*
|
||||
F: include/linux/efi*.h
|
||||
|
||||
EFI VARIABLE FILESYSTEM
|
||||
M: Matthew Garrett <matthew.garrett@nebula.com>
|
||||
M: Jeremy Kerr <jk@ozlabs.org>
|
||||
M: Matt Fleming <matt.fleming@intel.com>
|
||||
T: git git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi.git
|
||||
L: linux-efi@vger.kernel.org
|
||||
S: Maintained
|
||||
F: fs/efivarfs/
|
||||
|
||||
EFIFB FRAMEBUFFER DRIVER
|
||||
L: linux-fbdev@vger.kernel.org
|
||||
M: Peter Jones <pjones@redhat.com>
|
||||
|
|
@ -6391,7 +6400,7 @@ S: Maintained
|
|||
T: git git://git.infradead.org/users/cbou/linux-pstore.git
|
||||
F: fs/pstore/
|
||||
F: include/linux/pstore*
|
||||
F: drivers/firmware/efivars.c
|
||||
F: drivers/firmware/efi/efi-pstore.c
|
||||
F: drivers/acpi/apei/erst.c
|
||||
|
||||
PTP HARDWARE CLOCK SUPPORT
|
||||
|
|
|
|||
|
|
@ -110,6 +110,7 @@ config DMI
|
|||
|
||||
config EFI
|
||||
bool
|
||||
select UCS2_STRING
|
||||
default y
|
||||
|
||||
config SCHED_OMIT_FRAME_POINTER
|
||||
|
|
|
|||
|
|
@ -453,24 +453,25 @@ static void __init do_add_efi_memmap(void)
|
|||
|
||||
int __init efi_memblock_x86_reserve_range(void)
|
||||
{
|
||||
struct efi_info *e = &boot_params.efi_info;
|
||||
unsigned long pmap;
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
/* Can't handle data above 4GB at this time */
|
||||
if (boot_params.efi_info.efi_memmap_hi) {
|
||||
if (e->efi_memmap_hi) {
|
||||
pr_err("Memory map is above 4GB, disabling EFI.\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
pmap = boot_params.efi_info.efi_memmap;
|
||||
pmap = e->efi_memmap;
|
||||
#else
|
||||
pmap = (boot_params.efi_info.efi_memmap |
|
||||
((__u64)boot_params.efi_info.efi_memmap_hi<<32));
|
||||
pmap = (e->efi_memmap | ((__u64)e->efi_memmap_hi << 32));
|
||||
#endif
|
||||
memmap.phys_map = (void *)pmap;
|
||||
memmap.nr_map = boot_params.efi_info.efi_memmap_size /
|
||||
boot_params.efi_info.efi_memdesc_size;
|
||||
memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
|
||||
memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
|
||||
memmap.phys_map = (void *)pmap;
|
||||
memmap.nr_map = e->efi_memmap_size /
|
||||
e->efi_memdesc_size;
|
||||
memmap.desc_size = e->efi_memdesc_size;
|
||||
memmap.desc_version = e->efi_memdesc_version;
|
||||
|
||||
memblock_reserve(pmap, memmap.nr_map * memmap.desc_size);
|
||||
|
||||
return 0;
|
||||
|
|
|
|||
|
|
@ -36,42 +36,6 @@ config FIRMWARE_MEMMAP
|
|||
|
||||
See also Documentation/ABI/testing/sysfs-firmware-memmap.
|
||||
|
||||
config EFI_VARS
|
||||
tristate "EFI Variable Support via sysfs"
|
||||
depends on EFI
|
||||
select UCS2_STRING
|
||||
default n
|
||||
help
|
||||
If you say Y here, you are able to get EFI (Extensible Firmware
|
||||
Interface) variable information via sysfs. You may read,
|
||||
write, create, and destroy EFI variables through this interface.
|
||||
|
||||
Note that using this driver in concert with efibootmgr requires
|
||||
at least test release version 0.5.0-test3 or later, which is
|
||||
available from Matt Domsch's website located at:
|
||||
<http://linux.dell.com/efibootmgr/testing/efibootmgr-0.5.0-test3.tar.gz>
|
||||
|
||||
Subsequent efibootmgr releases may be found at:
|
||||
<http://linux.dell.com/efibootmgr>
|
||||
|
||||
config EFI_VARS_PSTORE
|
||||
bool "Register efivars backend for pstore"
|
||||
depends on EFI_VARS && PSTORE
|
||||
default y
|
||||
help
|
||||
Say Y here to enable use efivars as a backend to pstore. This
|
||||
will allow writing console messages, crash dumps, or anything
|
||||
else supported by pstore to EFI variables.
|
||||
|
||||
config EFI_VARS_PSTORE_DEFAULT_DISABLE
|
||||
bool "Disable using efivars as a pstore backend by default"
|
||||
depends on EFI_VARS_PSTORE
|
||||
default n
|
||||
help
|
||||
Saying Y here will disable the use of efivars as a storage
|
||||
backend for pstore by default. This setting can be overridden
|
||||
using the efivars module's pstore_disable parameter.
|
||||
|
||||
config EFI_PCDP
|
||||
bool "Console device selection via EFI PCDP or HCDP table"
|
||||
depends on ACPI && EFI && IA64
|
||||
|
|
@ -165,5 +129,6 @@ config ISCSI_IBFT
|
|||
Otherwise, say N.
|
||||
|
||||
source "drivers/firmware/google/Kconfig"
|
||||
source "drivers/firmware/efi/Kconfig"
|
||||
|
||||
endmenu
|
||||
|
|
|
|||
|
|
@ -4,7 +4,6 @@
|
|||
obj-$(CONFIG_DMI) += dmi_scan.o
|
||||
obj-$(CONFIG_DMI_SYSFS) += dmi-sysfs.o
|
||||
obj-$(CONFIG_EDD) += edd.o
|
||||
obj-$(CONFIG_EFI_VARS) += efivars.o
|
||||
obj-$(CONFIG_EFI_PCDP) += pcdp.o
|
||||
obj-$(CONFIG_DELL_RBU) += dell_rbu.o
|
||||
obj-$(CONFIG_DCDBAS) += dcdbas.o
|
||||
|
|
@ -14,3 +13,4 @@ obj-$(CONFIG_ISCSI_IBFT) += iscsi_ibft.o
|
|||
obj-$(CONFIG_FIRMWARE_MEMMAP) += memmap.o
|
||||
|
||||
obj-$(CONFIG_GOOGLE_FIRMWARE) += google/
|
||||
obj-$(CONFIG_EFI) += efi/
|
||||
|
|
|
|||
|
|
@ -0,0 +1,39 @@
|
|||
menu "EFI (Extensible Firmware Interface) Support"
|
||||
depends on EFI
|
||||
|
||||
config EFI_VARS
|
||||
tristate "EFI Variable Support via sysfs"
|
||||
depends on EFI
|
||||
default n
|
||||
help
|
||||
If you say Y here, you are able to get EFI (Extensible Firmware
|
||||
Interface) variable information via sysfs. You may read,
|
||||
write, create, and destroy EFI variables through this interface.
|
||||
|
||||
Note that using this driver in concert with efibootmgr requires
|
||||
at least test release version 0.5.0-test3 or later, which is
|
||||
available from Matt Domsch's website located at:
|
||||
<http://linux.dell.com/efibootmgr/testing/efibootmgr-0.5.0-test3.tar.gz>
|
||||
|
||||
Subsequent efibootmgr releases may be found at:
|
||||
<http://linux.dell.com/efibootmgr>
|
||||
|
||||
config EFI_VARS_PSTORE
|
||||
tristate "Register efivars backend for pstore"
|
||||
depends on EFI_VARS && PSTORE
|
||||
default y
|
||||
help
|
||||
Say Y here to enable use efivars as a backend to pstore. This
|
||||
will allow writing console messages, crash dumps, or anything
|
||||
else supported by pstore to EFI variables.
|
||||
|
||||
config EFI_VARS_PSTORE_DEFAULT_DISABLE
|
||||
bool "Disable using efivars as a pstore backend by default"
|
||||
depends on EFI_VARS_PSTORE
|
||||
default n
|
||||
help
|
||||
Saying Y here will disable the use of efivars as a storage
|
||||
backend for pstore by default. This setting can be overridden
|
||||
using the efivars module's pstore_disable parameter.
|
||||
|
||||
endmenu
|
||||
|
|
@ -0,0 +1,6 @@
|
|||
#
|
||||
# Makefile for linux kernel
|
||||
#
|
||||
obj-y += efi.o vars.o
|
||||
obj-$(CONFIG_EFI_VARS) += efivars.o
|
||||
obj-$(CONFIG_EFI_VARS_PSTORE) += efi-pstore.o
|
||||
|
|
@ -0,0 +1,251 @@
|
|||
#include <linux/efi.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/pstore.h>
|
||||
#include <linux/ucs2_string.h>
|
||||
|
||||
#define DUMP_NAME_LEN 52
|
||||
|
||||
static bool efivars_pstore_disable =
|
||||
IS_ENABLED(CONFIG_EFI_VARS_PSTORE_DEFAULT_DISABLE);
|
||||
|
||||
module_param_named(pstore_disable, efivars_pstore_disable, bool, 0644);
|
||||
|
||||
#define PSTORE_EFI_ATTRIBUTES \
|
||||
(EFI_VARIABLE_NON_VOLATILE | \
|
||||
EFI_VARIABLE_BOOTSERVICE_ACCESS | \
|
||||
EFI_VARIABLE_RUNTIME_ACCESS)
|
||||
|
||||
static int efi_pstore_open(struct pstore_info *psi)
|
||||
{
|
||||
efivar_entry_iter_begin();
|
||||
psi->data = NULL;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int efi_pstore_close(struct pstore_info *psi)
|
||||
{
|
||||
efivar_entry_iter_end();
|
||||
psi->data = NULL;
|
||||
return 0;
|
||||
}
|
||||
|
||||
struct pstore_read_data {
|
||||
u64 *id;
|
||||
enum pstore_type_id *type;
|
||||
int *count;
|
||||
struct timespec *timespec;
|
||||
char **buf;
|
||||
};
|
||||
|
||||
static int efi_pstore_read_func(struct efivar_entry *entry, void *data)
|
||||
{
|
||||
efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
|
||||
struct pstore_read_data *cb_data = data;
|
||||
char name[DUMP_NAME_LEN];
|
||||
int i;
|
||||
int cnt;
|
||||
unsigned int part;
|
||||
unsigned long time, size;
|
||||
|
||||
if (efi_guidcmp(entry->var.VendorGuid, vendor))
|
||||
return 0;
|
||||
|
||||
for (i = 0; i < DUMP_NAME_LEN; i++)
|
||||
name[i] = entry->var.VariableName[i];
|
||||
|
||||
if (sscanf(name, "dump-type%u-%u-%d-%lu",
|
||||
cb_data->type, &part, &cnt, &time) == 4) {
|
||||
*cb_data->id = part;
|
||||
*cb_data->count = cnt;
|
||||
cb_data->timespec->tv_sec = time;
|
||||
cb_data->timespec->tv_nsec = 0;
|
||||
} else if (sscanf(name, "dump-type%u-%u-%lu",
|
||||
cb_data->type, &part, &time) == 3) {
|
||||
/*
|
||||
* Check if an old format,
|
||||
* which doesn't support holding
|
||||
* multiple logs, remains.
|
||||
*/
|
||||
*cb_data->id = part;
|
||||
*cb_data->count = 0;
|
||||
cb_data->timespec->tv_sec = time;
|
||||
cb_data->timespec->tv_nsec = 0;
|
||||
} else
|
||||
return 0;
|
||||
|
||||
entry->var.DataSize = 1024;
|
||||
__efivar_entry_get(entry, &entry->var.Attributes,
|
||||
&entry->var.DataSize, entry->var.Data);
|
||||
size = entry->var.DataSize;
|
||||
|
||||
*cb_data->buf = kmalloc(size, GFP_KERNEL);
|
||||
if (*cb_data->buf == NULL)
|
||||
return -ENOMEM;
|
||||
memcpy(*cb_data->buf, entry->var.Data, size);
|
||||
return size;
|
||||
}
|
||||
|
||||
static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type,
|
||||
int *count, struct timespec *timespec,
|
||||
char **buf, struct pstore_info *psi)
|
||||
{
|
||||
struct pstore_read_data data;
|
||||
|
||||
data.id = id;
|
||||
data.type = type;
|
||||
data.count = count;
|
||||
data.timespec = timespec;
|
||||
data.buf = buf;
|
||||
|
||||
return __efivar_entry_iter(efi_pstore_read_func, &efivar_sysfs_list, &data,
|
||||
(struct efivar_entry **)&psi->data);
|
||||
}
|
||||
|
||||
static int efi_pstore_write(enum pstore_type_id type,
|
||||
enum kmsg_dump_reason reason, u64 *id,
|
||||
unsigned int part, int count, size_t size,
|
||||
struct pstore_info *psi)
|
||||
{
|
||||
char name[DUMP_NAME_LEN];
|
||||
efi_char16_t efi_name[DUMP_NAME_LEN];
|
||||
efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
|
||||
int i, ret = 0;
|
||||
|
||||
sprintf(name, "dump-type%u-%u-%d-%lu", type, part, count,
|
||||
get_seconds());
|
||||
|
||||
for (i = 0; i < DUMP_NAME_LEN; i++)
|
||||
efi_name[i] = name[i];
|
||||
|
||||
efivar_entry_set_safe(efi_name, vendor, PSTORE_EFI_ATTRIBUTES,
|
||||
!pstore_cannot_block_path(reason),
|
||||
size, psi->buf);
|
||||
|
||||
if (reason == KMSG_DUMP_OOPS)
|
||||
efivar_run_worker();
|
||||
|
||||
*id = part;
|
||||
return ret;
|
||||
};
|
||||
|
||||
struct pstore_erase_data {
|
||||
u64 id;
|
||||
enum pstore_type_id type;
|
||||
int count;
|
||||
struct timespec time;
|
||||
efi_char16_t *name;
|
||||
};
|
||||
|
||||
/*
|
||||
* Clean up an entry with the same name
|
||||
*/
|
||||
static int efi_pstore_erase_func(struct efivar_entry *entry, void *data)
|
||||
{
|
||||
struct pstore_erase_data *ed = data;
|
||||
efi_guid_t vendor = LINUX_EFI_CRASH_GUID;
|
||||
efi_char16_t efi_name_old[DUMP_NAME_LEN];
|
||||
efi_char16_t *efi_name = ed->name;
|
||||
unsigned long ucs2_len = ucs2_strlen(ed->name);
|
||||
char name_old[DUMP_NAME_LEN];
|
||||
int i;
|
||||
|
||||
if (efi_guidcmp(entry->var.VendorGuid, vendor))
|
||||
return 0;
|
||||
|
||||
if (ucs2_strncmp(entry->var.VariableName,
|
||||
efi_name, (size_t)ucs2_len)) {
|
||||
/*
|
||||
* Check if an old format, which doesn't support
|
||||
* holding multiple logs, remains.
|
||||
*/
|
||||
sprintf(name_old, "dump-type%u-%u-%lu", ed->type,
|
||||
(unsigned int)ed->id, ed->time.tv_sec);
|
||||
|
||||
for (i = 0; i < DUMP_NAME_LEN; i++)
|
||||
efi_name_old[i] = name_old[i];
|
||||
|
||||
if (ucs2_strncmp(entry->var.VariableName, efi_name_old,
|
||||
ucs2_strlen(efi_name_old)))
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* found */
|
||||
__efivar_entry_delete(entry);
|
||||
list_del(&entry->list);
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int efi_pstore_erase(enum pstore_type_id type, u64 id, int count,
|
||||
struct timespec time, struct pstore_info *psi)
|
||||
{
|
||||
struct pstore_erase_data edata;
|
||||
struct efivar_entry *entry = NULL;
|
||||
char name[DUMP_NAME_LEN];
|
||||
efi_char16_t efi_name[DUMP_NAME_LEN];
|
||||
int found, i;
|
||||
|
||||
sprintf(name, "dump-type%u-%u-%d-%lu", type, (unsigned int)id, count,
|
||||
time.tv_sec);
|
||||
|
||||
for (i = 0; i < DUMP_NAME_LEN; i++)
|
||||
efi_name[i] = name[i];
|
||||
|
||||
edata.id = id;
|
||||
edata.type = type;
|
||||
edata.count = count;
|
||||
edata.time = time;
|
||||
edata.name = efi_name;
|
||||
|
||||
efivar_entry_iter_begin();
|
||||
found = __efivar_entry_iter(efi_pstore_erase_func, &efivar_sysfs_list, &edata, &entry);
|
||||
efivar_entry_iter_end();
|
||||
|
||||
if (found)
|
||||
efivar_unregister(entry);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct pstore_info efi_pstore_info = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = "efi",
|
||||
.open = efi_pstore_open,
|
||||
.close = efi_pstore_close,
|
||||
.read = efi_pstore_read,
|
||||
.write = efi_pstore_write,
|
||||
.erase = efi_pstore_erase,
|
||||
};
|
||||
|
||||
static __init int efivars_pstore_init(void)
|
||||
{
|
||||
if (!efi_enabled(EFI_RUNTIME_SERVICES))
|
||||
return 0;
|
||||
|
||||
if (!efivars_kobject())
|
||||
return 0;
|
||||
|
||||
if (efivars_pstore_disable)
|
||||
return 0;
|
||||
|
||||
efi_pstore_info.buf = kmalloc(4096, GFP_KERNEL);
|
||||
if (!efi_pstore_info.buf)
|
||||
return -ENOMEM;
|
||||
|
||||
efi_pstore_info.bufsize = 1024;
|
||||
spin_lock_init(&efi_pstore_info.buf_lock);
|
||||
|
||||
pstore_register(&efi_pstore_info);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static __exit void efivars_pstore_exit(void)
|
||||
{
|
||||
}
|
||||
|
||||
module_init(efivars_pstore_init);
|
||||
module_exit(efivars_pstore_exit);
|
||||
|
||||
MODULE_DESCRIPTION("EFI variable backend for pstore");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
|
@ -0,0 +1,134 @@
|
|||
/*
|
||||
* efi.c - EFI subsystem
|
||||
*
|
||||
* Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com>
|
||||
* Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com>
|
||||
* Copyright (C) 2013 Tom Gundersen <teg@jklm.no>
|
||||
*
|
||||
* This code registers /sys/firmware/efi{,/efivars} when EFI is supported,
|
||||
* allowing the efivarfs to be mounted or the efivars module to be loaded.
|
||||
* The existance of /sys/firmware/efi may also be used by userspace to
|
||||
* determine that the system supports EFI.
|
||||
*
|
||||
* This file is released under the GPLv2.
|
||||
*/
|
||||
|
||||
#include <linux/kobject.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/device.h>
|
||||
#include <linux/efi.h>
|
||||
|
||||
static struct kobject *efi_kobj;
|
||||
static struct kobject *efivars_kobj;
|
||||
|
||||
/*
|
||||
* Let's not leave out systab information that snuck into
|
||||
* the efivars driver
|
||||
*/
|
||||
static ssize_t systab_show(struct kobject *kobj,
|
||||
struct kobj_attribute *attr, char *buf)
|
||||
{
|
||||
char *str = buf;
|
||||
|
||||
if (!kobj || !buf)
|
||||
return -EINVAL;
|
||||
|
||||
if (efi.mps != EFI_INVALID_TABLE_ADDR)
|
||||
str += sprintf(str, "MPS=0x%lx\n", efi.mps);
|
||||
if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
|
||||
str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20);
|
||||
if (efi.acpi != EFI_INVALID_TABLE_ADDR)
|
||||
str += sprintf(str, "ACPI=0x%lx\n", efi.acpi);
|
||||
if (efi.smbios != EFI_INVALID_TABLE_ADDR)
|
||||
str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios);
|
||||
if (efi.hcdp != EFI_INVALID_TABLE_ADDR)
|
||||
str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp);
|
||||
if (efi.boot_info != EFI_INVALID_TABLE_ADDR)
|
||||
str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info);
|
||||
if (efi.uga != EFI_INVALID_TABLE_ADDR)
|
||||
str += sprintf(str, "UGA=0x%lx\n", efi.uga);
|
||||
|
||||
return str - buf;
|
||||
}
|
||||
|
||||
static struct kobj_attribute efi_attr_systab =
|
||||
__ATTR(systab, 0400, systab_show, NULL);
|
||||
|
||||
static struct attribute *efi_subsys_attrs[] = {
|
||||
&efi_attr_systab.attr,
|
||||
NULL, /* maybe more in the future? */
|
||||
};
|
||||
|
||||
static struct attribute_group efi_subsys_attr_group = {
|
||||
.attrs = efi_subsys_attrs,
|
||||
};
|
||||
|
||||
static struct efivars generic_efivars;
|
||||
static struct efivar_operations generic_ops;
|
||||
|
||||
static int generic_ops_register(void)
|
||||
{
|
||||
generic_ops.get_variable = efi.get_variable;
|
||||
generic_ops.set_variable = efi.set_variable;
|
||||
generic_ops.get_next_variable = efi.get_next_variable;
|
||||
generic_ops.query_variable_store = efi_query_variable_store;
|
||||
|
||||
return efivars_register(&generic_efivars, &generic_ops, efi_kobj);
|
||||
}
|
||||
|
||||
static void generic_ops_unregister(void)
|
||||
{
|
||||
efivars_unregister(&generic_efivars);
|
||||
}
|
||||
|
||||
/*
|
||||
* We register the efi subsystem with the firmware subsystem and the
|
||||
* efivars subsystem with the efi subsystem, if the system was booted with
|
||||
* EFI.
|
||||
*/
|
||||
static int __init efisubsys_init(void)
|
||||
{
|
||||
int error;
|
||||
|
||||
if (!efi_enabled(EFI_BOOT))
|
||||
return 0;
|
||||
|
||||
/* We register the efi directory at /sys/firmware/efi */
|
||||
efi_kobj = kobject_create_and_add("efi", firmware_kobj);
|
||||
if (!efi_kobj) {
|
||||
pr_err("efi: Firmware registration failed.\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
error = generic_ops_register();
|
||||
if (error)
|
||||
goto err_put;
|
||||
|
||||
error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group);
|
||||
if (error) {
|
||||
pr_err("efi: Sysfs attribute export failed with error %d.\n",
|
||||
error);
|
||||
goto err_unregister;
|
||||
}
|
||||
|
||||
/* and the standard mountpoint for efivarfs */
|
||||
efivars_kobj = kobject_create_and_add("efivars", efi_kobj);
|
||||
if (!efivars_kobj) {
|
||||
pr_err("efivars: Subsystem registration failed.\n");
|
||||
error = -ENOMEM;
|
||||
goto err_remove_group;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
err_remove_group:
|
||||
sysfs_remove_group(efi_kobj, &efi_subsys_attr_group);
|
||||
err_unregister:
|
||||
generic_ops_unregister();
|
||||
err_put:
|
||||
kobject_put(efi_kobj);
|
||||
return error;
|
||||
}
|
||||
|
||||
subsys_initcall(efisubsys_init);
|
||||
|
|
@ -0,0 +1,616 @@
|
|||
/*
|
||||
* Originally from efivars.c,
|
||||
*
|
||||
* Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com>
|
||||
* Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com>
|
||||
*
|
||||
* This code takes all variables accessible from EFI runtime and
|
||||
* exports them via sysfs
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||||
*
|
||||
* Changelog:
|
||||
*
|
||||
* 17 May 2004 - Matt Domsch <Matt_Domsch@dell.com>
|
||||
* remove check for efi_enabled in exit
|
||||
* add MODULE_VERSION
|
||||
*
|
||||
* 26 Apr 2004 - Matt Domsch <Matt_Domsch@dell.com>
|
||||
* minor bug fixes
|
||||
*
|
||||
* 21 Apr 2004 - Matt Tolentino <matthew.e.tolentino@intel.com)
|
||||
* converted driver to export variable information via sysfs
|
||||
* and moved to drivers/firmware directory
|
||||
* bumped revision number to v0.07 to reflect conversion & move
|
||||
*
|
||||
* 10 Dec 2002 - Matt Domsch <Matt_Domsch@dell.com>
|
||||
* fix locking per Peter Chubb's findings
|
||||
*
|
||||
* 25 Mar 2002 - Matt Domsch <Matt_Domsch@dell.com>
|
||||
* move uuid_unparse() to include/asm-ia64/efi.h:efi_guid_unparse()
|
||||
*
|
||||
* 12 Feb 2002 - Matt Domsch <Matt_Domsch@dell.com>
|
||||
* use list_for_each_safe when deleting vars.
|
||||
* remove ifdef CONFIG_SMP around include <linux/smp.h>
|
||||
* v0.04 release to linux-ia64@linuxia64.org
|
||||
*
|
||||
* 20 April 2001 - Matt Domsch <Matt_Domsch@dell.com>
|
||||
* Moved vars from /proc/efi to /proc/efi/vars, and made
|
||||
* efi.c own the /proc/efi directory.
|
||||
* v0.03 release to linux-ia64@linuxia64.org
|
||||
*
|
||||
* 26 March 2001 - Matt Domsch <Matt_Domsch@dell.com>
|
||||
* At the request of Stephane, moved ownership of /proc/efi
|
||||
* to efi.c, and now efivars lives under /proc/efi/vars.
|
||||
*
|
||||
* 12 March 2001 - Matt Domsch <Matt_Domsch@dell.com>
|
||||
* Feedback received from Stephane Eranian incorporated.
|
||||
* efivar_write() checks copy_from_user() return value.
|
||||
* efivar_read/write() returns proper errno.
|
||||
* v0.02 release to linux-ia64@linuxia64.org
|
||||
*
|
||||
* 26 February 2001 - Matt Domsch <Matt_Domsch@dell.com>
|
||||
* v0.01 release to linux-ia64@linuxia64.org
|
||||
*/
|
||||
|
||||
#include <linux/efi.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/ucs2_string.h>
|
||||
|
||||
#define EFIVARS_VERSION "0.08"
|
||||
#define EFIVARS_DATE "2004-May-17"
|
||||
|
||||
MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>");
|
||||
MODULE_DESCRIPTION("sysfs interface to EFI Variables");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_VERSION(EFIVARS_VERSION);
|
||||
|
||||
LIST_HEAD(efivar_sysfs_list);
|
||||
EXPORT_SYMBOL_GPL(efivar_sysfs_list);
|
||||
|
||||
static struct kset *efivars_kset;
|
||||
|
||||
static struct bin_attribute *efivars_new_var;
|
||||
static struct bin_attribute *efivars_del_var;
|
||||
|
||||
struct efivar_attribute {
|
||||
struct attribute attr;
|
||||
ssize_t (*show) (struct efivar_entry *entry, char *buf);
|
||||
ssize_t (*store)(struct efivar_entry *entry, const char *buf, size_t count);
|
||||
};
|
||||
|
||||
#define EFIVAR_ATTR(_name, _mode, _show, _store) \
|
||||
struct efivar_attribute efivar_attr_##_name = { \
|
||||
.attr = {.name = __stringify(_name), .mode = _mode}, \
|
||||
.show = _show, \
|
||||
.store = _store, \
|
||||
};
|
||||
|
||||
#define to_efivar_attr(_attr) container_of(_attr, struct efivar_attribute, attr)
|
||||
#define to_efivar_entry(obj) container_of(obj, struct efivar_entry, kobj)
|
||||
|
||||
/*
|
||||
* Prototype for sysfs creation function
|
||||
*/
|
||||
static int
|
||||
efivar_create_sysfs_entry(struct efivar_entry *new_var);
|
||||
|
||||
static ssize_t
|
||||
efivar_guid_read(struct efivar_entry *entry, char *buf)
|
||||
{
|
||||
struct efi_variable *var = &entry->var;
|
||||
char *str = buf;
|
||||
|
||||
if (!entry || !buf)
|
||||
return 0;
|
||||
|
||||
efi_guid_unparse(&var->VendorGuid, str);
|
||||
str += strlen(str);
|
||||
str += sprintf(str, "\n");
|
||||
|
||||
return str - buf;
|
||||
}
|
||||
|
||||
static ssize_t
|
||||
efivar_attr_read(struct efivar_entry *entry, char *buf)
|
||||
{
|
||||
struct efi_variable *var = &entry->var;
|
||||
char *str = buf;
|
||||
|
||||
if (!entry || !buf)
|
||||
return -EINVAL;
|
||||
|
||||
var->DataSize = 1024;
|
||||
if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data))
|
||||
return -EIO;
|
||||
|
||||
if (var->Attributes & EFI_VARIABLE_NON_VOLATILE)
|
||||
str += sprintf(str, "EFI_VARIABLE_NON_VOLATILE\n");
|
||||
if (var->Attributes & EFI_VARIABLE_BOOTSERVICE_ACCESS)
|
||||
str += sprintf(str, "EFI_VARIABLE_BOOTSERVICE_ACCESS\n");
|
||||
if (var->Attributes & EFI_VARIABLE_RUNTIME_ACCESS)
|
||||
str += sprintf(str, "EFI_VARIABLE_RUNTIME_ACCESS\n");
|
||||
if (var->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD)
|
||||
str += sprintf(str, "EFI_VARIABLE_HARDWARE_ERROR_RECORD\n");
|
||||
if (var->Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS)
|
||||
str += sprintf(str,
|
||||
"EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS\n");
|
||||
if (var->Attributes &
|
||||
EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS)
|
||||
str += sprintf(str,
|
||||
"EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS\n");
|
||||
if (var->Attributes & EFI_VARIABLE_APPEND_WRITE)
|
||||
str += sprintf(str, "EFI_VARIABLE_APPEND_WRITE\n");
|
||||
return str - buf;
|
||||
}
|
||||
|
||||
static ssize_t
|
||||
efivar_size_read(struct efivar_entry *entry, char *buf)
|
||||
{
|
||||
struct efi_variable *var = &entry->var;
|
||||
char *str = buf;
|
||||
|
||||
if (!entry || !buf)
|
||||
return -EINVAL;
|
||||
|
||||
var->DataSize = 1024;
|
||||
if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data))
|
||||
return -EIO;
|
||||
|
||||
str += sprintf(str, "0x%lx\n", var->DataSize);
|
||||
return str - buf;
|
||||
}
|
||||
|
||||
static ssize_t
|
||||
efivar_data_read(struct efivar_entry *entry, char *buf)
|
||||
{
|
||||
struct efi_variable *var = &entry->var;
|
||||
|
||||
if (!entry || !buf)
|
||||
return -EINVAL;
|
||||
|
||||
var->DataSize = 1024;
|
||||
if (efivar_entry_get(entry, &var->Attributes, &var->DataSize, var->Data))
|
||||
return -EIO;
|
||||
|
||||
memcpy(buf, var->Data, var->DataSize);
|
||||
return var->DataSize;
|
||||
}
|
||||
/*
|
||||
* We allow each variable to be edited via rewriting the
|
||||
* entire efi variable structure.
|
||||
*/
|
||||
static ssize_t
|
||||
efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count)
|
||||
{
|
||||
struct efi_variable *new_var, *var = &entry->var;
|
||||
int err;
|
||||
|
||||
if (count != sizeof(struct efi_variable))
|
||||
return -EINVAL;
|
||||
|
||||
new_var = (struct efi_variable *)buf;
|
||||
/*
|
||||
* If only updating the variable data, then the name
|
||||
* and guid should remain the same
|
||||
*/
|
||||
if (memcmp(new_var->VariableName, var->VariableName, sizeof(var->VariableName)) ||
|
||||
efi_guidcmp(new_var->VendorGuid, var->VendorGuid)) {
|
||||
printk(KERN_ERR "efivars: Cannot edit the wrong variable!\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if ((new_var->DataSize <= 0) || (new_var->Attributes == 0)){
|
||||
printk(KERN_ERR "efivars: DataSize & Attributes must be valid!\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 ||
|
||||
efivar_validate(new_var, new_var->Data, new_var->DataSize) == false) {
|
||||
printk(KERN_ERR "efivars: Malformed variable content\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
memcpy(&entry->var, new_var, count);
|
||||
|
||||
err = efivar_entry_set(entry, new_var->Attributes,
|
||||
new_var->DataSize, new_var->Data, false);
|
||||
if (err) {
|
||||
printk(KERN_WARNING "efivars: set_variable() failed: status=%d\n", err);
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
return count;
|
||||
}
|
||||
|
||||
static ssize_t
|
||||
efivar_show_raw(struct efivar_entry *entry, char *buf)
|
||||
{
|
||||
struct efi_variable *var = &entry->var;
|
||||
|
||||
if (!entry || !buf)
|
||||
return 0;
|
||||
|
||||
var->DataSize = 1024;
|
||||
if (efivar_entry_get(entry, &entry->var.Attributes,
|
||||
&entry->var.DataSize, entry->var.Data))
|
||||
return -EIO;
|
||||
|
||||
memcpy(buf, var, sizeof(*var));
|
||||
|
||||
return sizeof(*var);
|
||||
}
|
||||
|
||||
/*
|
||||
* Generic read/write functions that call the specific functions of
|
||||
* the attributes...
|
||||
*/
|
||||
static ssize_t efivar_attr_show(struct kobject *kobj, struct attribute *attr,
|
||||
char *buf)
|
||||
{
|
||||
struct efivar_entry *var = to_efivar_entry(kobj);
|
||||
struct efivar_attribute *efivar_attr = to_efivar_attr(attr);
|
||||
ssize_t ret = -EIO;
|
||||
|
||||
if (!capable(CAP_SYS_ADMIN))
|
||||
return -EACCES;
|
||||
|
||||
if (efivar_attr->show) {
|
||||
ret = efivar_attr->show(var, buf);
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
static ssize_t efivar_attr_store(struct kobject *kobj, struct attribute *attr,
|
||||
const char *buf, size_t count)
|
||||
{
|
||||
struct efivar_entry *var = to_efivar_entry(kobj);
|
||||
struct efivar_attribute *efivar_attr = to_efivar_attr(attr);
|
||||
ssize_t ret = -EIO;
|
||||
|
||||
if (!capable(CAP_SYS_ADMIN))
|
||||
return -EACCES;
|
||||
|
||||
if (efivar_attr->store)
|
||||
ret = efivar_attr->store(var, buf, count);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static const struct sysfs_ops efivar_attr_ops = {
|
||||
.show = efivar_attr_show,
|
||||
.store = efivar_attr_store,
|
||||
};
|
||||
|
||||
static void efivar_release(struct kobject *kobj)
|
||||
{
|
||||
struct efivar_entry *var = container_of(kobj, struct efivar_entry, kobj);
|
||||
kfree(var);
|
||||
}
|
||||
|
||||
static EFIVAR_ATTR(guid, 0400, efivar_guid_read, NULL);
|
||||
static EFIVAR_ATTR(attributes, 0400, efivar_attr_read, NULL);
|
||||
static EFIVAR_ATTR(size, 0400, efivar_size_read, NULL);
|
||||
static EFIVAR_ATTR(data, 0400, efivar_data_read, NULL);
|
||||
static EFIVAR_ATTR(raw_var, 0600, efivar_show_raw, efivar_store_raw);
|
||||
|
||||
static struct attribute *def_attrs[] = {
|
||||
&efivar_attr_guid.attr,
|
||||
&efivar_attr_size.attr,
|
||||
&efivar_attr_attributes.attr,
|
||||
&efivar_attr_data.attr,
|
||||
&efivar_attr_raw_var.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
static struct kobj_type efivar_ktype = {
|
||||
.release = efivar_release,
|
||||
.sysfs_ops = &efivar_attr_ops,
|
||||
.default_attrs = def_attrs,
|
||||
};
|
||||
|
||||
static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
|
||||
struct bin_attribute *bin_attr,
|
||||
char *buf, loff_t pos, size_t count)
|
||||
{
|
||||
struct efi_variable *new_var = (struct efi_variable *)buf;
|
||||
struct efivar_entry *new_entry;
|
||||
int err;
|
||||
|
||||
if (!capable(CAP_SYS_ADMIN))
|
||||
return -EACCES;
|
||||
|
||||
if ((new_var->Attributes & ~EFI_VARIABLE_MASK) != 0 ||
|
||||
efivar_validate(new_var, new_var->Data, new_var->DataSize) == false) {
|
||||
printk(KERN_ERR "efivars: Malformed variable content\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
new_entry = kzalloc(sizeof(*new_entry), GFP_KERNEL);
|
||||
if (!new_entry)
|
||||
return -ENOMEM;
|
||||
|
||||
memcpy(&new_entry->var, new_var, sizeof(*new_var));
|
||||
|
||||
err = efivar_entry_set(new_entry, new_var->Attributes, new_var->DataSize,
|
||||
new_var->Data, &efivar_sysfs_list);
|
||||
if (err) {
|
||||
if (err == -EEXIST)
|
||||
err = -EINVAL;
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (efivar_create_sysfs_entry(new_entry)) {
|
||||
printk(KERN_WARNING "efivars: failed to create sysfs entry.\n");
|
||||
kfree(new_entry);
|
||||
}
|
||||
return count;
|
||||
|
||||
out:
|
||||
kfree(new_entry);
|
||||
return err;
|
||||
}
|
||||
|
||||
static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
|
||||
struct bin_attribute *bin_attr,
|
||||
char *buf, loff_t pos, size_t count)
|
||||
{
|
||||
struct efi_variable *del_var = (struct efi_variable *)buf;
|
||||
struct efivar_entry *entry;
|
||||
int err = 0;
|
||||
|
||||
if (!capable(CAP_SYS_ADMIN))
|
||||
return -EACCES;
|
||||
|
||||
efivar_entry_iter_begin();
|
||||
entry = efivar_entry_find(del_var->VariableName, del_var->VendorGuid,
|
||||
&efivar_sysfs_list, true);
|
||||
if (!entry)
|
||||
err = -EINVAL;
|
||||
else if (__efivar_entry_delete(entry))
|
||||
err = -EIO;
|
||||
|
||||
efivar_entry_iter_end();
|
||||
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
efivar_unregister(entry);
|
||||
|
||||
/* It's dead Jim.... */
|
||||
return count;
|
||||
}
|
||||
|
||||
/**
|
||||
* efivar_create_sysfs_entry - create a new entry in sysfs
|
||||
* @new_var: efivar entry to create
|
||||
*
|
||||
* Returns 1 on failure, 0 on success
|
||||
*/
|
||||
static int
|
||||
efivar_create_sysfs_entry(struct efivar_entry *new_var)
|
||||
{
|
||||
int i, short_name_size;
|
||||
char *short_name;
|
||||
unsigned long variable_name_size;
|
||||
efi_char16_t *variable_name;
|
||||
|
||||
variable_name = new_var->var.VariableName;
|
||||
variable_name_size = ucs2_strlen(variable_name) * sizeof(efi_char16_t);
|
||||
|
||||
/*
|
||||
* Length of the variable bytes in ASCII, plus the '-' separator,
|
||||
* plus the GUID, plus trailing NUL
|
||||
*/
|
||||
short_name_size = variable_name_size / sizeof(efi_char16_t)
|
||||
+ 1 + EFI_VARIABLE_GUID_LEN + 1;
|
||||
|
||||
short_name = kzalloc(short_name_size, GFP_KERNEL);
|
||||
|
||||
if (!short_name)
|
||||
return 1;
|
||||
|
||||
/* Convert Unicode to normal chars (assume top bits are 0),
|
||||
ala UTF-8 */
|
||||
for (i=0; i < (int)(variable_name_size / sizeof(efi_char16_t)); i++) {
|
||||
short_name[i] = variable_name[i] & 0xFF;
|
||||
}
|
||||
/* This is ugly, but necessary to separate one vendor's
|
||||
private variables from another's. */
|
||||
|
||||
*(short_name + strlen(short_name)) = '-';
|
||||
efi_guid_unparse(&new_var->var.VendorGuid,
|
||||
short_name + strlen(short_name));
|
||||
|
||||
new_var->kobj.kset = efivars_kset;
|
||||
|
||||
i = kobject_init_and_add(&new_var->kobj, &efivar_ktype,
|
||||
NULL, "%s", short_name);
|
||||
kfree(short_name);
|
||||
if (i)
|
||||
return 1;
|
||||
|
||||
kobject_uevent(&new_var->kobj, KOBJ_ADD);
|
||||
efivar_entry_add(new_var, &efivar_sysfs_list);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
create_efivars_bin_attributes(void)
|
||||
{
|
||||
struct bin_attribute *attr;
|
||||
int error;
|
||||
|
||||
/* new_var */
|
||||
attr = kzalloc(sizeof(*attr), GFP_KERNEL);
|
||||
if (!attr)
|
||||
return -ENOMEM;
|
||||
|
||||
attr->attr.name = "new_var";
|
||||
attr->attr.mode = 0200;
|
||||
attr->write = efivar_create;
|
||||
efivars_new_var = attr;
|
||||
|
||||
/* del_var */
|
||||
attr = kzalloc(sizeof(*attr), GFP_KERNEL);
|
||||
if (!attr) {
|
||||
error = -ENOMEM;
|
||||
goto out_free;
|
||||
}
|
||||
attr->attr.name = "del_var";
|
||||
attr->attr.mode = 0200;
|
||||
attr->write = efivar_delete;
|
||||
efivars_del_var = attr;
|
||||
|
||||
sysfs_bin_attr_init(efivars_new_var);
|
||||
sysfs_bin_attr_init(efivars_del_var);
|
||||
|
||||
/* Register */
|
||||
error = sysfs_create_bin_file(&efivars_kset->kobj, efivars_new_var);
|
||||
if (error) {
|
||||
printk(KERN_ERR "efivars: unable to create new_var sysfs file"
|
||||
" due to error %d\n", error);
|
||||
goto out_free;
|
||||
}
|
||||
|
||||
error = sysfs_create_bin_file(&efivars_kset->kobj, efivars_del_var);
|
||||
if (error) {
|
||||
printk(KERN_ERR "efivars: unable to create del_var sysfs file"
|
||||
" due to error %d\n", error);
|
||||
sysfs_remove_bin_file(&efivars_kset->kobj, efivars_new_var);
|
||||
goto out_free;
|
||||
}
|
||||
|
||||
return 0;
|
||||
out_free:
|
||||
kfree(efivars_del_var);
|
||||
efivars_del_var = NULL;
|
||||
kfree(efivars_new_var);
|
||||
efivars_new_var = NULL;
|
||||
return error;
|
||||
}
|
||||
|
||||
static int efivar_update_sysfs_entry(efi_char16_t *name, efi_guid_t vendor,
|
||||
unsigned long name_size, void *data)
|
||||
{
|
||||
struct efivar_entry *entry = data;
|
||||
|
||||
if (efivar_entry_find(name, vendor, &efivar_sysfs_list, false))
|
||||
return 0;
|
||||
|
||||
memcpy(entry->var.VariableName, name, name_size);
|
||||
memcpy(&(entry->var.VendorGuid), &vendor, sizeof(efi_guid_t));
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
static void efivar_update_sysfs_entries(struct work_struct *work)
|
||||
{
|
||||
struct efivar_entry *entry;
|
||||
int err;
|
||||
|
||||
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
|
||||
if (!entry)
|
||||
return;
|
||||
|
||||
/* Add new sysfs entries */
|
||||
while (1) {
|
||||
memset(entry, 0, sizeof(*entry));
|
||||
|
||||
err = efivar_init(efivar_update_sysfs_entry, entry,
|
||||
true, false, &efivar_sysfs_list);
|
||||
if (!err)
|
||||
break;
|
||||
|
||||
efivar_create_sysfs_entry(entry);
|
||||
}
|
||||
|
||||
kfree(entry);
|
||||
}
|
||||
|
||||
static int efivars_sysfs_callback(efi_char16_t *name, efi_guid_t vendor,
|
||||
unsigned long name_size, void *data)
|
||||
{
|
||||
struct efivar_entry *entry;
|
||||
|
||||
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
|
||||
if (!entry)
|
||||
return -ENOMEM;
|
||||
|
||||
memcpy(entry->var.VariableName, name, name_size);
|
||||
memcpy(&(entry->var.VendorGuid), &vendor, sizeof(efi_guid_t));
|
||||
|
||||
efivar_create_sysfs_entry(entry);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int efivar_sysfs_destroy(struct efivar_entry *entry, void *data)
|
||||
{
|
||||
efivar_entry_remove(entry);
|
||||
efivar_unregister(entry);
|
||||
return 0;
|
||||
}
|
||||
|
||||
void efivars_sysfs_exit(void)
|
||||
{
|
||||
/* Remove all entries and destroy */
|
||||
__efivar_entry_iter(efivar_sysfs_destroy, &efivar_sysfs_list, NULL, NULL);
|
||||
|
||||
if (efivars_new_var)
|
||||
sysfs_remove_bin_file(&efivars_kset->kobj, efivars_new_var);
|
||||
if (efivars_del_var)
|
||||
sysfs_remove_bin_file(&efivars_kset->kobj, efivars_del_var);
|
||||
kfree(efivars_new_var);
|
||||
kfree(efivars_del_var);
|
||||
kset_unregister(efivars_kset);
|
||||
}
|
||||
|
||||
int efivars_sysfs_init(void)
|
||||
{
|
||||
struct kobject *parent_kobj = efivars_kobject();
|
||||
int error = 0;
|
||||
|
||||
/* No efivars has been registered yet */
|
||||
if (!parent_kobj)
|
||||
return 0;
|
||||
|
||||
printk(KERN_INFO "EFI Variables Facility v%s %s\n", EFIVARS_VERSION,
|
||||
EFIVARS_DATE);
|
||||
|
||||
efivars_kset = kset_create_and_add("vars", NULL, parent_kobj);
|
||||
if (!efivars_kset) {
|
||||
printk(KERN_ERR "efivars: Subsystem registration failed.\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
efivar_init(efivars_sysfs_callback, NULL, false,
|
||||
true, &efivar_sysfs_list);
|
||||
|
||||
error = create_efivars_bin_attributes();
|
||||
if (error) {
|
||||
efivars_sysfs_exit();
|
||||
return error;
|
||||
}
|
||||
|
||||
INIT_WORK(&efivar_work, efivar_update_sysfs_entries);
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(efivars_sysfs_init);
|
||||
|
||||
module_init(efivars_sysfs_init);
|
||||
module_exit(efivars_sysfs_exit);
|
||||
File diff suppressed because it is too large
Load Diff
File diff suppressed because it is too large
Load Diff
|
|
@ -28,6 +28,7 @@
|
|||
#include <linux/reboot.h>
|
||||
#include <linux/efi.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/ucs2_string.h>
|
||||
|
||||
#define GSMI_SHUTDOWN_CLEAN 0 /* Clean Shutdown */
|
||||
/* TODO(mikew@google.com): Tie in HARDLOCKUP_DETECTOR with NMIWDT */
|
||||
|
|
@ -288,17 +289,6 @@ static int gsmi_exec(u8 func, u8 sub)
|
|||
return rc;
|
||||
}
|
||||
|
||||
/* Return the number of unicode characters in data */
|
||||
static size_t
|
||||
utf16_strlen(efi_char16_t *data, unsigned long maxlength)
|
||||
{
|
||||
unsigned long length = 0;
|
||||
|
||||
while (*data++ != 0 && length < maxlength)
|
||||
length++;
|
||||
return length;
|
||||
}
|
||||
|
||||
static efi_status_t gsmi_get_variable(efi_char16_t *name,
|
||||
efi_guid_t *vendor, u32 *attr,
|
||||
unsigned long *data_size,
|
||||
|
|
@ -311,7 +301,7 @@ static efi_status_t gsmi_get_variable(efi_char16_t *name,
|
|||
};
|
||||
efi_status_t ret = EFI_SUCCESS;
|
||||
unsigned long flags;
|
||||
size_t name_len = utf16_strlen(name, GSMI_BUF_SIZE / 2);
|
||||
size_t name_len = ucs2_strnlen(name, GSMI_BUF_SIZE / 2);
|
||||
int rc;
|
||||
|
||||
if (name_len >= GSMI_BUF_SIZE / 2)
|
||||
|
|
@ -380,7 +370,7 @@ static efi_status_t gsmi_get_next_variable(unsigned long *name_size,
|
|||
return EFI_BAD_BUFFER_SIZE;
|
||||
|
||||
/* Let's make sure the thing is at least null-terminated */
|
||||
if (utf16_strlen(name, GSMI_BUF_SIZE / 2) == GSMI_BUF_SIZE / 2)
|
||||
if (ucs2_strnlen(name, GSMI_BUF_SIZE / 2) == GSMI_BUF_SIZE / 2)
|
||||
return EFI_INVALID_PARAMETER;
|
||||
|
||||
spin_lock_irqsave(&gsmi_dev.lock, flags);
|
||||
|
|
@ -408,7 +398,7 @@ static efi_status_t gsmi_get_next_variable(unsigned long *name_size,
|
|||
|
||||
/* Copy the name back */
|
||||
memcpy(name, gsmi_dev.name_buf->start, GSMI_BUF_SIZE);
|
||||
*name_size = utf16_strlen(name, GSMI_BUF_SIZE / 2) * 2;
|
||||
*name_size = ucs2_strnlen(name, GSMI_BUF_SIZE / 2) * 2;
|
||||
|
||||
/* copy guid to return buffer */
|
||||
memcpy(vendor, ¶m.guid, sizeof(param.guid));
|
||||
|
|
@ -434,7 +424,7 @@ static efi_status_t gsmi_set_variable(efi_char16_t *name,
|
|||
EFI_VARIABLE_BOOTSERVICE_ACCESS |
|
||||
EFI_VARIABLE_RUNTIME_ACCESS,
|
||||
};
|
||||
size_t name_len = utf16_strlen(name, GSMI_BUF_SIZE / 2);
|
||||
size_t name_len = ucs2_strnlen(name, GSMI_BUF_SIZE / 2);
|
||||
efi_status_t ret = EFI_SUCCESS;
|
||||
int rc;
|
||||
unsigned long flags;
|
||||
|
|
@ -893,12 +883,19 @@ static __init int gsmi_init(void)
|
|||
goto out_remove_bin_file;
|
||||
}
|
||||
|
||||
ret = register_efivars(&efivars, &efivar_ops, gsmi_kobj);
|
||||
ret = efivars_register(&efivars, &efivar_ops, gsmi_kobj);
|
||||
if (ret) {
|
||||
printk(KERN_INFO "gsmi: Failed to register efivars\n");
|
||||
goto out_remove_sysfs_files;
|
||||
}
|
||||
|
||||
ret = efivars_sysfs_init();
|
||||
if (ret) {
|
||||
printk(KERN_INFO "gsmi: Failed to create efivars files\n");
|
||||
efivars_unregister(&efivars);
|
||||
goto out_remove_sysfs_files;
|
||||
}
|
||||
|
||||
register_reboot_notifier(&gsmi_reboot_notifier);
|
||||
register_die_notifier(&gsmi_die_notifier);
|
||||
atomic_notifier_chain_register(&panic_notifier_list,
|
||||
|
|
@ -930,7 +927,7 @@ static void __exit gsmi_exit(void)
|
|||
unregister_die_notifier(&gsmi_die_notifier);
|
||||
atomic_notifier_chain_unregister(&panic_notifier_list,
|
||||
&gsmi_panic_notifier);
|
||||
unregister_efivars(&efivars);
|
||||
efivars_unregister(&efivars);
|
||||
|
||||
sysfs_remove_files(gsmi_kobj, gsmi_attrs);
|
||||
sysfs_remove_bin_file(gsmi_kobj, &eventlog_bin_attr);
|
||||
|
|
|
|||
|
|
@ -211,6 +211,7 @@ source "fs/sysv/Kconfig"
|
|||
source "fs/ufs/Kconfig"
|
||||
source "fs/exofs/Kconfig"
|
||||
source "fs/f2fs/Kconfig"
|
||||
source "fs/efivarfs/Kconfig"
|
||||
|
||||
endif # MISC_FILESYSTEMS
|
||||
|
||||
|
|
|
|||
|
|
@ -125,3 +125,4 @@ obj-$(CONFIG_F2FS_FS) += f2fs/
|
|||
obj-y += exofs/ # Multiple modules
|
||||
obj-$(CONFIG_CEPH_FS) += ceph/
|
||||
obj-$(CONFIG_PSTORE) += pstore/
|
||||
obj-$(CONFIG_EFIVAR_FS) += efivarfs/
|
||||
|
|
|
|||
|
|
@ -0,0 +1,12 @@
|
|||
config EFIVAR_FS
|
||||
tristate "EFI Variable filesystem"
|
||||
depends on EFI
|
||||
help
|
||||
efivarfs is a replacement filesystem for the old EFI
|
||||
variable support via sysfs, as it doesn't suffer from the
|
||||
same 1024-byte variable size limit.
|
||||
|
||||
To compile this file system support as a module, choose M
|
||||
here. The module will be called efivarfs.
|
||||
|
||||
If unsure, say N.
|
||||
|
|
@ -0,0 +1,7 @@
|
|||
#
|
||||
# Makefile for the efivarfs filesystem
|
||||
#
|
||||
|
||||
obj-$(CONFIG_EFIVAR_FS) += efivarfs.o
|
||||
|
||||
efivarfs-objs := inode.o file.o super.o
|
||||
|
|
@ -0,0 +1,105 @@
|
|||
/*
|
||||
* Copyright (C) 2012 Red Hat, Inc.
|
||||
* Copyright (C) 2012 Jeremy Kerr <jeremy.kerr@canonical.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#include <linux/efi.h>
|
||||
#include <linux/fs.h>
|
||||
|
||||
#include "internal.h"
|
||||
|
||||
static ssize_t efivarfs_file_write(struct file *file,
|
||||
const char __user *userbuf, size_t count, loff_t *ppos)
|
||||
{
|
||||
struct efivar_entry *var = file->private_data;
|
||||
void *data;
|
||||
u32 attributes;
|
||||
struct inode *inode = file->f_mapping->host;
|
||||
unsigned long datasize = count - sizeof(attributes);
|
||||
ssize_t bytes = 0;
|
||||
bool set = false;
|
||||
|
||||
if (count < sizeof(attributes))
|
||||
return -EINVAL;
|
||||
|
||||
if (copy_from_user(&attributes, userbuf, sizeof(attributes)))
|
||||
return -EFAULT;
|
||||
|
||||
if (attributes & ~(EFI_VARIABLE_MASK))
|
||||
return -EINVAL;
|
||||
|
||||
data = kmalloc(datasize, GFP_KERNEL);
|
||||
if (!data)
|
||||
return -ENOMEM;
|
||||
|
||||
if (copy_from_user(data, userbuf + sizeof(attributes), datasize)) {
|
||||
bytes = -EFAULT;
|
||||
goto out;
|
||||
}
|
||||
|
||||
bytes = efivar_entry_set_get_size(var, attributes, &datasize,
|
||||
data, &set);
|
||||
if (!set && bytes)
|
||||
goto out;
|
||||
|
||||
if (bytes == -ENOENT) {
|
||||
drop_nlink(inode);
|
||||
d_delete(file->f_dentry);
|
||||
dput(file->f_dentry);
|
||||
} else {
|
||||
mutex_lock(&inode->i_mutex);
|
||||
i_size_write(inode, datasize + sizeof(attributes));
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
}
|
||||
|
||||
bytes = count;
|
||||
|
||||
out:
|
||||
kfree(data);
|
||||
|
||||
return bytes;
|
||||
}
|
||||
|
||||
static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf,
|
||||
size_t count, loff_t *ppos)
|
||||
{
|
||||
struct efivar_entry *var = file->private_data;
|
||||
unsigned long datasize = 0;
|
||||
u32 attributes;
|
||||
void *data;
|
||||
ssize_t size = 0;
|
||||
int err;
|
||||
|
||||
err = efivar_entry_size(var, &datasize);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
data = kmalloc(datasize + sizeof(attributes), GFP_KERNEL);
|
||||
|
||||
if (!data)
|
||||
return -ENOMEM;
|
||||
|
||||
size = efivar_entry_get(var, &attributes, &datasize,
|
||||
data + sizeof(attributes));
|
||||
if (size)
|
||||
goto out_free;
|
||||
|
||||
memcpy(data, &attributes, sizeof(attributes));
|
||||
size = simple_read_from_buffer(userbuf, count, ppos,
|
||||
data, datasize + sizeof(attributes));
|
||||
out_free:
|
||||
kfree(data);
|
||||
|
||||
return size;
|
||||
}
|
||||
|
||||
const struct file_operations efivarfs_file_operations = {
|
||||
.open = simple_open,
|
||||
.read = efivarfs_file_read,
|
||||
.write = efivarfs_file_write,
|
||||
.llseek = no_llseek,
|
||||
};
|
||||
|
|
@ -0,0 +1,173 @@
|
|||
/*
|
||||
* Copyright (C) 2012 Red Hat, Inc.
|
||||
* Copyright (C) 2012 Jeremy Kerr <jeremy.kerr@canonical.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#include <linux/efi.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/ctype.h>
|
||||
|
||||
#include "internal.h"
|
||||
|
||||
struct inode *efivarfs_get_inode(struct super_block *sb,
|
||||
const struct inode *dir, int mode, dev_t dev)
|
||||
{
|
||||
struct inode *inode = new_inode(sb);
|
||||
|
||||
if (inode) {
|
||||
inode->i_ino = get_next_ino();
|
||||
inode->i_mode = mode;
|
||||
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
|
||||
switch (mode & S_IFMT) {
|
||||
case S_IFREG:
|
||||
inode->i_fop = &efivarfs_file_operations;
|
||||
break;
|
||||
case S_IFDIR:
|
||||
inode->i_op = &efivarfs_dir_inode_operations;
|
||||
inode->i_fop = &simple_dir_operations;
|
||||
inc_nlink(inode);
|
||||
break;
|
||||
}
|
||||
}
|
||||
return inode;
|
||||
}
|
||||
|
||||
/*
|
||||
* Return true if 'str' is a valid efivarfs filename of the form,
|
||||
*
|
||||
* VariableName-12345678-1234-1234-1234-1234567891bc
|
||||
*/
|
||||
bool efivarfs_valid_name(const char *str, int len)
|
||||
{
|
||||
static const char dashes[EFI_VARIABLE_GUID_LEN] = {
|
||||
[8] = 1, [13] = 1, [18] = 1, [23] = 1
|
||||
};
|
||||
const char *s = str + len - EFI_VARIABLE_GUID_LEN;
|
||||
int i;
|
||||
|
||||
/*
|
||||
* We need a GUID, plus at least one letter for the variable name,
|
||||
* plus the '-' separator
|
||||
*/
|
||||
if (len < EFI_VARIABLE_GUID_LEN + 2)
|
||||
return false;
|
||||
|
||||
/* GUID must be preceded by a '-' */
|
||||
if (*(s - 1) != '-')
|
||||
return false;
|
||||
|
||||
/*
|
||||
* Validate that 's' is of the correct format, e.g.
|
||||
*
|
||||
* 12345678-1234-1234-1234-123456789abc
|
||||
*/
|
||||
for (i = 0; i < EFI_VARIABLE_GUID_LEN; i++) {
|
||||
if (dashes[i]) {
|
||||
if (*s++ != '-')
|
||||
return false;
|
||||
} else {
|
||||
if (!isxdigit(*s++))
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
static void efivarfs_hex_to_guid(const char *str, efi_guid_t *guid)
|
||||
{
|
||||
guid->b[0] = hex_to_bin(str[6]) << 4 | hex_to_bin(str[7]);
|
||||
guid->b[1] = hex_to_bin(str[4]) << 4 | hex_to_bin(str[5]);
|
||||
guid->b[2] = hex_to_bin(str[2]) << 4 | hex_to_bin(str[3]);
|
||||
guid->b[3] = hex_to_bin(str[0]) << 4 | hex_to_bin(str[1]);
|
||||
guid->b[4] = hex_to_bin(str[11]) << 4 | hex_to_bin(str[12]);
|
||||
guid->b[5] = hex_to_bin(str[9]) << 4 | hex_to_bin(str[10]);
|
||||
guid->b[6] = hex_to_bin(str[16]) << 4 | hex_to_bin(str[17]);
|
||||
guid->b[7] = hex_to_bin(str[14]) << 4 | hex_to_bin(str[15]);
|
||||
guid->b[8] = hex_to_bin(str[19]) << 4 | hex_to_bin(str[20]);
|
||||
guid->b[9] = hex_to_bin(str[21]) << 4 | hex_to_bin(str[22]);
|
||||
guid->b[10] = hex_to_bin(str[24]) << 4 | hex_to_bin(str[25]);
|
||||
guid->b[11] = hex_to_bin(str[26]) << 4 | hex_to_bin(str[27]);
|
||||
guid->b[12] = hex_to_bin(str[28]) << 4 | hex_to_bin(str[29]);
|
||||
guid->b[13] = hex_to_bin(str[30]) << 4 | hex_to_bin(str[31]);
|
||||
guid->b[14] = hex_to_bin(str[32]) << 4 | hex_to_bin(str[33]);
|
||||
guid->b[15] = hex_to_bin(str[34]) << 4 | hex_to_bin(str[35]);
|
||||
}
|
||||
|
||||
static int efivarfs_create(struct inode *dir, struct dentry *dentry,
|
||||
umode_t mode, bool excl)
|
||||
{
|
||||
struct inode *inode;
|
||||
struct efivar_entry *var;
|
||||
int namelen, i = 0, err = 0;
|
||||
|
||||
if (!efivarfs_valid_name(dentry->d_name.name, dentry->d_name.len))
|
||||
return -EINVAL;
|
||||
|
||||
inode = efivarfs_get_inode(dir->i_sb, dir, mode, 0);
|
||||
if (!inode)
|
||||
return -ENOMEM;
|
||||
|
||||
var = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL);
|
||||
if (!var) {
|
||||
err = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
|
||||
/* length of the variable name itself: remove GUID and separator */
|
||||
namelen = dentry->d_name.len - EFI_VARIABLE_GUID_LEN - 1;
|
||||
|
||||
efivarfs_hex_to_guid(dentry->d_name.name + namelen + 1,
|
||||
&var->var.VendorGuid);
|
||||
|
||||
for (i = 0; i < namelen; i++)
|
||||
var->var.VariableName[i] = dentry->d_name.name[i];
|
||||
|
||||
var->var.VariableName[i] = '\0';
|
||||
|
||||
inode->i_private = var;
|
||||
|
||||
efivar_entry_add(var, &efivarfs_list);
|
||||
d_instantiate(dentry, inode);
|
||||
dget(dentry);
|
||||
out:
|
||||
if (err) {
|
||||
kfree(var);
|
||||
iput(inode);
|
||||
}
|
||||
return err;
|
||||
}
|
||||
|
||||
static int efivarfs_unlink(struct inode *dir, struct dentry *dentry)
|
||||
{
|
||||
struct efivar_entry *var = dentry->d_inode->i_private;
|
||||
|
||||
if (efivar_entry_delete(var))
|
||||
return -EINVAL;
|
||||
|
||||
drop_nlink(dentry->d_inode);
|
||||
dput(dentry);
|
||||
return 0;
|
||||
};
|
||||
|
||||
/*
|
||||
* Handle negative dentry.
|
||||
*/
|
||||
static struct dentry *efivarfs_lookup(struct inode *dir, struct dentry *dentry,
|
||||
unsigned int flags)
|
||||
{
|
||||
if (dentry->d_name.len > NAME_MAX)
|
||||
return ERR_PTR(-ENAMETOOLONG);
|
||||
d_add(dentry, NULL);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
const struct inode_operations efivarfs_dir_inode_operations = {
|
||||
.lookup = efivarfs_lookup,
|
||||
.unlink = efivarfs_unlink,
|
||||
.create = efivarfs_create,
|
||||
};
|
||||
|
|
@ -0,0 +1,22 @@
|
|||
/*
|
||||
* Copyright (C) 2012 Red Hat, Inc.
|
||||
* Copyright (C) 2012 Jeremy Kerr <jeremy.kerr@canonical.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
#ifndef EFIVAR_FS_INTERNAL_H
|
||||
#define EFIVAR_FS_INTERNAL_H
|
||||
|
||||
#include <linux/list.h>
|
||||
|
||||
extern const struct file_operations efivarfs_file_operations;
|
||||
extern const struct inode_operations efivarfs_dir_inode_operations;
|
||||
extern bool efivarfs_valid_name(const char *str, int len);
|
||||
extern struct inode *efivarfs_get_inode(struct super_block *sb,
|
||||
const struct inode *dir, int mode, dev_t dev);
|
||||
|
||||
extern struct list_head efivarfs_list;
|
||||
|
||||
#endif /* EFIVAR_FS_INTERNAL_H */
|
||||
|
|
@ -0,0 +1,268 @@
|
|||
/*
|
||||
* Copyright (C) 2012 Red Hat, Inc.
|
||||
* Copyright (C) 2012 Jeremy Kerr <jeremy.kerr@canonical.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#include <linux/ctype.h>
|
||||
#include <linux/efi.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/pagemap.h>
|
||||
#include <linux/ucs2_string.h>
|
||||
|
||||
#include "internal.h"
|
||||
|
||||
LIST_HEAD(efivarfs_list);
|
||||
|
||||
static void efivarfs_evict_inode(struct inode *inode)
|
||||
{
|
||||
clear_inode(inode);
|
||||
}
|
||||
|
||||
static const struct super_operations efivarfs_ops = {
|
||||
.statfs = simple_statfs,
|
||||
.drop_inode = generic_delete_inode,
|
||||
.evict_inode = efivarfs_evict_inode,
|
||||
.show_options = generic_show_options,
|
||||
};
|
||||
|
||||
static struct super_block *efivarfs_sb;
|
||||
|
||||
/*
|
||||
* Compare two efivarfs file names.
|
||||
*
|
||||
* An efivarfs filename is composed of two parts,
|
||||
*
|
||||
* 1. A case-sensitive variable name
|
||||
* 2. A case-insensitive GUID
|
||||
*
|
||||
* So we need to perform a case-sensitive match on part 1 and a
|
||||
* case-insensitive match on part 2.
|
||||
*/
|
||||
static int efivarfs_d_compare(const struct dentry *parent, const struct inode *pinode,
|
||||
const struct dentry *dentry, const struct inode *inode,
|
||||
unsigned int len, const char *str,
|
||||
const struct qstr *name)
|
||||
{
|
||||
int guid = len - EFI_VARIABLE_GUID_LEN;
|
||||
|
||||
if (name->len != len)
|
||||
return 1;
|
||||
|
||||
/* Case-sensitive compare for the variable name */
|
||||
if (memcmp(str, name->name, guid))
|
||||
return 1;
|
||||
|
||||
/* Case-insensitive compare for the GUID */
|
||||
return strncasecmp(name->name + guid, str + guid, EFI_VARIABLE_GUID_LEN);
|
||||
}
|
||||
|
||||
static int efivarfs_d_hash(const struct dentry *dentry,
|
||||
const struct inode *inode, struct qstr *qstr)
|
||||
{
|
||||
unsigned long hash = init_name_hash();
|
||||
const unsigned char *s = qstr->name;
|
||||
unsigned int len = qstr->len;
|
||||
|
||||
if (!efivarfs_valid_name(s, len))
|
||||
return -EINVAL;
|
||||
|
||||
while (len-- > EFI_VARIABLE_GUID_LEN)
|
||||
hash = partial_name_hash(*s++, hash);
|
||||
|
||||
/* GUID is case-insensitive. */
|
||||
while (len--)
|
||||
hash = partial_name_hash(tolower(*s++), hash);
|
||||
|
||||
qstr->hash = end_name_hash(hash);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Retaining negative dentries for an in-memory filesystem just wastes
|
||||
* memory and lookup time: arrange for them to be deleted immediately.
|
||||
*/
|
||||
static int efivarfs_delete_dentry(const struct dentry *dentry)
|
||||
{
|
||||
return 1;
|
||||
}
|
||||
|
||||
static struct dentry_operations efivarfs_d_ops = {
|
||||
.d_compare = efivarfs_d_compare,
|
||||
.d_hash = efivarfs_d_hash,
|
||||
.d_delete = efivarfs_delete_dentry,
|
||||
};
|
||||
|
||||
static struct dentry *efivarfs_alloc_dentry(struct dentry *parent, char *name)
|
||||
{
|
||||
struct dentry *d;
|
||||
struct qstr q;
|
||||
int err;
|
||||
|
||||
q.name = name;
|
||||
q.len = strlen(name);
|
||||
|
||||
err = efivarfs_d_hash(NULL, NULL, &q);
|
||||
if (err)
|
||||
return ERR_PTR(err);
|
||||
|
||||
d = d_alloc(parent, &q);
|
||||
if (d)
|
||||
return d;
|
||||
|
||||
return ERR_PTR(-ENOMEM);
|
||||
}
|
||||
|
||||
static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor,
|
||||
unsigned long name_size, void *data)
|
||||
{
|
||||
struct super_block *sb = (struct super_block *)data;
|
||||
struct efivar_entry *entry;
|
||||
struct inode *inode = NULL;
|
||||
struct dentry *dentry, *root = sb->s_root;
|
||||
unsigned long size = 0;
|
||||
char *name;
|
||||
int len, i;
|
||||
int err = -ENOMEM;
|
||||
|
||||
entry = kmalloc(sizeof(*entry), GFP_KERNEL);
|
||||
if (!entry)
|
||||
return err;
|
||||
|
||||
memcpy(entry->var.VariableName, name16, name_size);
|
||||
memcpy(&(entry->var.VendorGuid), &vendor, sizeof(efi_guid_t));
|
||||
|
||||
len = ucs2_strlen(entry->var.VariableName);
|
||||
|
||||
/* name, plus '-', plus GUID, plus NUL*/
|
||||
name = kmalloc(len + 1 + EFI_VARIABLE_GUID_LEN + 1, GFP_KERNEL);
|
||||
if (!name)
|
||||
goto fail;
|
||||
|
||||
for (i = 0; i < len; i++)
|
||||
name[i] = entry->var.VariableName[i] & 0xFF;
|
||||
|
||||
name[len] = '-';
|
||||
|
||||
efi_guid_unparse(&entry->var.VendorGuid, name + len + 1);
|
||||
|
||||
name[len + EFI_VARIABLE_GUID_LEN+1] = '\0';
|
||||
|
||||
inode = efivarfs_get_inode(sb, root->d_inode, S_IFREG | 0644, 0);
|
||||
if (!inode)
|
||||
goto fail_name;
|
||||
|
||||
dentry = efivarfs_alloc_dentry(root, name);
|
||||
if (IS_ERR(dentry)) {
|
||||
err = PTR_ERR(dentry);
|
||||
goto fail_inode;
|
||||
}
|
||||
|
||||
/* copied by the above to local storage in the dentry. */
|
||||
kfree(name);
|
||||
|
||||
efivar_entry_size(entry, &size);
|
||||
efivar_entry_add(entry, &efivarfs_list);
|
||||
|
||||
mutex_lock(&inode->i_mutex);
|
||||
inode->i_private = entry;
|
||||
i_size_write(inode, size + sizeof(entry->var.Attributes));
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
d_add(dentry, inode);
|
||||
|
||||
return 0;
|
||||
|
||||
fail_inode:
|
||||
iput(inode);
|
||||
fail_name:
|
||||
kfree(name);
|
||||
fail:
|
||||
kfree(entry);
|
||||
return err;
|
||||
}
|
||||
|
||||
static int efivarfs_destroy(struct efivar_entry *entry, void *data)
|
||||
{
|
||||
efivar_entry_remove(entry);
|
||||
kfree(entry);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int efivarfs_fill_super(struct super_block *sb, void *data, int silent)
|
||||
{
|
||||
struct inode *inode = NULL;
|
||||
struct dentry *root;
|
||||
int err;
|
||||
|
||||
efivarfs_sb = sb;
|
||||
|
||||
sb->s_maxbytes = MAX_LFS_FILESIZE;
|
||||
sb->s_blocksize = PAGE_CACHE_SIZE;
|
||||
sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
|
||||
sb->s_magic = EFIVARFS_MAGIC;
|
||||
sb->s_op = &efivarfs_ops;
|
||||
sb->s_d_op = &efivarfs_d_ops;
|
||||
sb->s_time_gran = 1;
|
||||
|
||||
inode = efivarfs_get_inode(sb, NULL, S_IFDIR | 0755, 0);
|
||||
if (!inode)
|
||||
return -ENOMEM;
|
||||
inode->i_op = &efivarfs_dir_inode_operations;
|
||||
|
||||
root = d_make_root(inode);
|
||||
sb->s_root = root;
|
||||
if (!root)
|
||||
return -ENOMEM;
|
||||
|
||||
INIT_LIST_HEAD(&efivarfs_list);
|
||||
|
||||
err = efivar_init(efivarfs_callback, (void *)sb, false,
|
||||
true, &efivarfs_list);
|
||||
if (err)
|
||||
__efivar_entry_iter(efivarfs_destroy, &efivarfs_list, NULL, NULL);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static struct dentry *efivarfs_mount(struct file_system_type *fs_type,
|
||||
int flags, const char *dev_name, void *data)
|
||||
{
|
||||
return mount_single(fs_type, flags, data, efivarfs_fill_super);
|
||||
}
|
||||
|
||||
static void efivarfs_kill_sb(struct super_block *sb)
|
||||
{
|
||||
kill_litter_super(sb);
|
||||
efivarfs_sb = NULL;
|
||||
|
||||
/* Remove all entries and destroy */
|
||||
__efivar_entry_iter(efivarfs_destroy, &efivarfs_list, NULL, NULL);
|
||||
}
|
||||
|
||||
static struct file_system_type efivarfs_type = {
|
||||
.name = "efivarfs",
|
||||
.mount = efivarfs_mount,
|
||||
.kill_sb = efivarfs_kill_sb,
|
||||
};
|
||||
|
||||
static __init int efivarfs_init(void)
|
||||
{
|
||||
if (!efi_enabled(EFI_RUNTIME_SERVICES))
|
||||
return 0;
|
||||
|
||||
if (!efivars_kobject())
|
||||
return 0;
|
||||
|
||||
return register_filesystem(&efivarfs_type);
|
||||
}
|
||||
|
||||
MODULE_AUTHOR("Matthew Garrett, Jeremy Kerr");
|
||||
MODULE_DESCRIPTION("EFI Variable Filesystem");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS_FS("efivarfs");
|
||||
|
||||
module_init(efivarfs_init);
|
||||
|
|
@ -669,6 +669,12 @@ static inline int efi_enabled(int facility)
|
|||
EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS | \
|
||||
EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS | \
|
||||
EFI_VARIABLE_APPEND_WRITE)
|
||||
/*
|
||||
* Length of a GUID string (strlen("aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee"))
|
||||
* not including trailing NUL
|
||||
*/
|
||||
#define EFI_VARIABLE_GUID_LEN 36
|
||||
|
||||
/*
|
||||
* The type of search to perform when calling boottime->locate_handle
|
||||
*/
|
||||
|
|
@ -726,7 +732,6 @@ static inline void memrange_efi_to_native(u64 *addr, u64 *npages)
|
|||
*addr &= PAGE_MASK;
|
||||
}
|
||||
|
||||
#if defined(CONFIG_EFI_VARS) || defined(CONFIG_EFI_VARS_MODULE)
|
||||
/*
|
||||
* EFI Variable support.
|
||||
*
|
||||
|
|
@ -752,19 +757,88 @@ struct efivars {
|
|||
* which is protected by the BKL, so that path is safe.
|
||||
*/
|
||||
spinlock_t lock;
|
||||
struct list_head list;
|
||||
struct kset *kset;
|
||||
struct kobject *kobject;
|
||||
struct bin_attribute *new_var, *del_var;
|
||||
const struct efivar_operations *ops;
|
||||
struct efivar_entry *walk_entry;
|
||||
struct pstore_info efi_pstore_info;
|
||||
};
|
||||
|
||||
int register_efivars(struct efivars *efivars,
|
||||
/*
|
||||
* The maximum size of VariableName + Data = 1024
|
||||
* Therefore, it's reasonable to save that much
|
||||
* space in each part of the structure,
|
||||
* and we use a page for reading/writing.
|
||||
*/
|
||||
|
||||
struct efi_variable {
|
||||
efi_char16_t VariableName[1024/sizeof(efi_char16_t)];
|
||||
efi_guid_t VendorGuid;
|
||||
unsigned long DataSize;
|
||||
__u8 Data[1024];
|
||||
efi_status_t Status;
|
||||
__u32 Attributes;
|
||||
} __attribute__((packed));
|
||||
|
||||
struct efivar_entry {
|
||||
struct efi_variable var;
|
||||
struct list_head list;
|
||||
struct kobject kobj;
|
||||
};
|
||||
|
||||
extern struct list_head efivar_sysfs_list;
|
||||
|
||||
static inline void
|
||||
efivar_unregister(struct efivar_entry *var)
|
||||
{
|
||||
kobject_put(&var->kobj);
|
||||
}
|
||||
|
||||
int efivars_register(struct efivars *efivars,
|
||||
const struct efivar_operations *ops,
|
||||
struct kobject *parent_kobj);
|
||||
void unregister_efivars(struct efivars *efivars);
|
||||
struct kobject *kobject);
|
||||
int efivars_unregister(struct efivars *efivars);
|
||||
struct kobject *efivars_kobject(void);
|
||||
|
||||
int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *),
|
||||
void *data, bool atomic, bool duplicates,
|
||||
struct list_head *head);
|
||||
|
||||
void efivar_entry_add(struct efivar_entry *entry, struct list_head *head);
|
||||
void efivar_entry_remove(struct efivar_entry *entry);
|
||||
|
||||
int __efivar_entry_delete(struct efivar_entry *entry);
|
||||
int efivar_entry_delete(struct efivar_entry *entry);
|
||||
|
||||
int efivar_entry_size(struct efivar_entry *entry, unsigned long *size);
|
||||
int __efivar_entry_get(struct efivar_entry *entry, u32 *attributes,
|
||||
unsigned long *size, void *data);
|
||||
int efivar_entry_get(struct efivar_entry *entry, u32 *attributes,
|
||||
unsigned long *size, void *data);
|
||||
int efivar_entry_set(struct efivar_entry *entry, u32 attributes,
|
||||
unsigned long size, void *data, struct list_head *head);
|
||||
int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes,
|
||||
unsigned long *size, void *data, bool *set);
|
||||
int efivar_entry_set_safe(efi_char16_t *name, efi_guid_t vendor, u32 attributes,
|
||||
bool block, unsigned long size, void *data);
|
||||
|
||||
void efivar_entry_iter_begin(void);
|
||||
void efivar_entry_iter_end(void);
|
||||
|
||||
int __efivar_entry_iter(int (*func)(struct efivar_entry *, void *),
|
||||
struct list_head *head, void *data,
|
||||
struct efivar_entry **prev);
|
||||
int efivar_entry_iter(int (*func)(struct efivar_entry *, void *),
|
||||
struct list_head *head, void *data);
|
||||
|
||||
struct efivar_entry *efivar_entry_find(efi_char16_t *name, efi_guid_t guid,
|
||||
struct list_head *head, bool remove);
|
||||
|
||||
bool efivar_validate(struct efi_variable *var, u8 *data, unsigned long len);
|
||||
|
||||
extern struct work_struct efivar_work;
|
||||
void efivar_run_worker(void);
|
||||
|
||||
#if defined(CONFIG_EFI_VARS) || defined(CONFIG_EFI_VARS_MODULE)
|
||||
int efivars_sysfs_init(void);
|
||||
|
||||
#endif /* CONFIG_EFI_VARS */
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue