efi: Autoload efivars (28d54022) · Commits · 戴 / test

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:

Lee, Chun-Yi <jlee@suse.com> Cc: Ben Hutchings <ben@decadent.org.uk> Tested-by:

Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by:

Matt Fleming <matt.fleming@intel.com>

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);

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