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efivars: Expose efivars functionality to external drivers.

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Signed-off-by: Mike Waychison <mikew@google.com>
Cc: Matt Domsch <Matt_Domsch@dell.com>,
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Mike Waychison
2011-03-11 17:43:27 -08:00
committed by Greg Kroah-Hartman
parent 3295814d83
commit 4fc756bd9d
2 changed files with 44 additions and 27 deletions
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34
drivers/firmware/efivars.c
View File

@@ -89,28 +89,6 @@ MODULE_DESCRIPTION("sysfs interface to EFI Variables");
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");
MODULE_VERSION(EFIVARS_VERSION); MODULE_VERSION(EFIVARS_VERSION);
struct efivar_operations {
efi_get_variable_t *get_variable;
efi_get_next_variable_t *get_next_variable;
efi_set_variable_t *set_variable;
};
struct efivars {
/*
* ->lock protects two things:
* 1) ->list - adds, removals, reads, writes
* 2) ops.[gs]et_variable() calls.
* It must not be held when creating sysfs entries or calling kmalloc.
* ops.get_next_variable() is only called from register_efivars(),
* which is protected by the BKL, so that path is safe.
*/
spinlock_t lock;
struct list_head list;
struct kset *kset;
struct bin_attribute *new_var, *del_var;
const struct efivar_operations *ops;
};
/* /*
* The maximum size of VariableName + Data = 1024 * The maximum size of VariableName + Data = 1024
* Therefore, it's reasonable to save that much * Therefore, it's reasonable to save that much
@@ -706,7 +684,7 @@ out_free:
return error; return error;
} }
static void unregister_efivars(struct efivars *efivars) void unregister_efivars(struct efivars *efivars)
{ {
struct efivar_entry *entry, *n; struct efivar_entry *entry, *n;
@@ -724,10 +702,11 @@ static void unregister_efivars(struct efivars *efivars)
kfree(efivars->del_var); kfree(efivars->del_var);
kset_unregister(efivars->kset); kset_unregister(efivars->kset);
} }
EXPORT_SYMBOL_GPL(unregister_efivars);
static int register_efivars(struct efivars *efivars, int register_efivars(struct efivars *efivars,
const struct efivar_operations *ops, const struct efivar_operations *ops,
struct kobject *parent_kobj) struct kobject *parent_kobj)
{ {
efi_status_t status = EFI_NOT_FOUND; efi_status_t status = EFI_NOT_FOUND;
efi_guid_t vendor_guid; efi_guid_t vendor_guid;
@@ -789,6 +768,7 @@ out:
return error; return error;
} }
EXPORT_SYMBOL_GPL(register_efivars);
static struct efivars __efivars; static struct efivars __efivars;
static struct efivar_operations ops; static struct efivar_operations ops;
@@ -810,7 +790,7 @@ efivars_init(void)
EFIVARS_DATE); EFIVARS_DATE);
if (!efi_enabled) if (!efi_enabled)
return -ENODEV; return 0;
/* For now we'll register the efi directory at /sys/firmware/efi */ /* For now we'll register the efi directory at /sys/firmware/efi */
efi_kobj = kobject_create_and_add("efi", firmware_kobj); efi_kobj = kobject_create_and_add("efi", firmware_kobj);

37
include/linux/efi.h
View File

@@ -397,4 +397,41 @@ static inline void memrange_efi_to_native(u64 *addr, u64 *npages)
*addr &= PAGE_MASK; *addr &= PAGE_MASK;
} }
#if defined(CONFIG_EFI_VARS) || defined(CONFIG_EFI_VARS_MODULE)
/*
* EFI Variable support.
*
* Different firmware drivers can expose their EFI-like variables using
* the following.
*/
struct efivar_operations {
efi_get_variable_t *get_variable;
efi_get_next_variable_t *get_next_variable;
efi_set_variable_t *set_variable;
};
struct efivars {
/*
* ->lock protects two things:
* 1) ->list - adds, removals, reads, writes
* 2) ops.[gs]et_variable() calls.
* It must not be held when creating sysfs entries or calling kmalloc.
* ops.get_next_variable() is only called from register_efivars(),
* which is protected by the BKL, so that path is safe.
*/
spinlock_t lock;
struct list_head list;
struct kset *kset;
struct bin_attribute *new_var, *del_var;
const struct efivar_operations *ops;
};
int register_efivars(struct efivars *efivars,
const struct efivar_operations *ops,
struct kobject *parent_kobj);
void unregister_efivars(struct efivars *efivars);
#endif /* CONFIG_EFI_VARS */
#endif /* _LINUX_EFI_H */ #endif /* _LINUX_EFI_H */