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Commit 28d54022 authored by Lee, Chun-Yi's avatar Lee, Chun-Yi Committed by Matt Fleming
Browse files

efi: Autoload efivars 

The original patch is from Ben Hutchings's contribution to debian
kernel. Got Ben's permission to remove the code of efi-pstore.c and
send to linux-efi:
https://github.com/BlankOn/linux-debian/blob/master/debian/patches/features/all/efi-autoload-efivars.patch



efivars is generally useful to have on EFI systems, and in some cases
it may be impossible to load it after a kernel upgrade in order to
complete a boot loader update. At the same time we don't want to waste
memory on non-EFI systems by making them built-in.

Instead, give them module aliases as if they are platform drivers, and
register a corresponding platform device whenever EFI runtime services
are available.  This should trigger udev to load them.

Signed-off-by: default avatarLee, Chun-Yi <jlee@suse.com>
Cc: Ben Hutchings <ben@decadent.org.uk>
Tested-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: default avatarMatt Fleming <matt.fleming@intel.com>
parent 82f990a8

drivers/firmware/efi/efi.c

+15 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
#include <linux/of.h>

#include <linux/of_fdt.h>

#include <linux/io.h>

#include <linux/platform_device.h>



struct efi __read_mostly efi = {

	.mps        = EFI_INVALID_TABLE_ADDR,
@@ -324,6 +325,20 @@ int __init efi_config_init(efi_config_table_type_t *arch_tables) 
	return 0;

}



#ifdef CONFIG_EFI_VARS_MODULE

static int __init efi_load_efivars(void)

{

	struct platform_device *pdev;



	if (!efi_enabled(EFI_RUNTIME_SERVICES))

		return 0;



	pdev = platform_device_register_simple("efivars", 0, NULL, 0);

	return IS_ERR(pdev) ? PTR_ERR(pdev) : 0;

}

device_initcall(efi_load_efivars);

#endif



#ifdef CONFIG_EFI_PARAMS_FROM_FDT



#define UEFI_PARAM(name, prop, field)			   \

drivers/firmware/efi/efivars.c

+1 −0
Original line number Diff line number Diff line
@@ -78,6 +78,7 @@ MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>"); 
MODULE_DESCRIPTION("sysfs interface to EFI Variables");

MODULE_LICENSE("GPL");

MODULE_VERSION(EFIVARS_VERSION);

MODULE_ALIAS("platform:efivars");



LIST_HEAD(efivar_sysfs_list);

EXPORT_SYMBOL_GPL(efivar_sysfs_list);