Commit 4fc756bd authored by Mike Waychison's avatar Mike Waychison Committed by Greg Kroah-Hartman
Browse files

efivars: Expose efivars functionality to external drivers. 



Signed-off-by: default avatarMike Waychison <mikew@google.com>
Cc: Matt Domsch <Matt_Domsch@dell.com>,
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 3295814d

drivers/firmware/efivars.c

+7 −27
Original line number Diff line number Diff line
@@ -89,28 +89,6 @@ MODULE_DESCRIPTION("sysfs interface to EFI Variables"); 
MODULE_LICENSE("GPL");

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

 * Therefore, it's reasonable to save that much
@@ -706,7 +684,7 @@ create_efivars_bin_attributes(struct efivars *efivars) 
	return error;

}



static void unregister_efivars(struct efivars *efivars)

void unregister_efivars(struct efivars *efivars)

{

	struct efivar_entry *entry, *n;
@@ -724,8 +702,9 @@ static void unregister_efivars(struct efivars *efivars) 
	kfree(efivars->del_var);

	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,

		     struct kobject *parent_kobj)

{
@@ -789,6 +768,7 @@ static int register_efivars(struct efivars *efivars, 


	return error;

}

EXPORT_SYMBOL_GPL(register_efivars);



static struct efivars __efivars;

static struct efivar_operations ops;
@@ -810,7 +790,7 @@ efivars_init(void) 
	       EFIVARS_DATE);



	if (!efi_enabled)

		return -ENODEV;

		return 0;



	/* For now we'll register the efi directory at /sys/firmware/efi */

	efi_kobj = kobject_create_and_add("efi", firmware_kobj);

include/linux/efi.h

+37 −0
Original line number Diff line number Diff line
@@ -397,4 +397,41 @@ 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.

 *

 * 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 */