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: 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>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index ac88ec05eb70..36ffa1747e84 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -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)                      \