On Tue, 08 Jul, at 11:00:58AM, Lee, Chun-Yi wrote:
> 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
> then patch 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.
>
> Cc: Ben Hutchings <[email protected]>
> Cc: Matt Fleming <[email protected]>
> Signed-off-by: Lee, Chun-Yi <[email protected]>
> ---
> arch/x86/platform/efi/efi.c | 15 +++++++++++++++
> drivers/firmware/efi/efivars.c | 1 +
> 2 files changed, 16 insertions(+)
>
> diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
> index 87fc96b..c295c08 100644
> --- a/arch/x86/platform/efi/efi.c
> +++ b/arch/x86/platform/efi/efi.c
> @@ -44,6 +44,7 @@
> #include <linux/io.h>
> #include <linux/reboot.h>
> #include <linux/bcd.h>
> +#include <linux/platform_device.h>
>
> #include <asm/setup.h>
> #include <asm/efi.h>
> @@ -780,6 +781,20 @@ void __init efi_late_init(void)
> efi_bgrt_init();
> }
>
> +#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
> +
Could this be moved to drivers/firmware/efi/efi.c? That way the arm64
folks could benefit from it too.
> void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
> {
> u64 addr, npages;
> diff --git a/drivers/firmware/efi/efivars.c b/drivers/firmware/efi/efivars.c
> index 463c565..f256ecd 100644
> --- a/drivers/firmware/efi/efivars.c
> +++ b/drivers/firmware/efi/efivars.c
> @@ -78,6 +78,7 @@ MODULE_AUTHOR("Matt Domsch <[email protected]>");
> 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);
> --
> 1.8.4.5
>
> --
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--
Matt Fleming, Intel Open Source Technology Center
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