[PATCH] efi: add bootsource detection

[Sascha Hauer]

On Tue, Feb 20, 2018 at 12:17:06PM +0100, Enrico Jorns wrote:
> We check the supported protocol of the parent EFI device of
> 'efi_loaded_image' to see if we are booted from USB or not (HD)
> 
> Signed-off-by: Enrico Jorns <ejo at pengutronix.de>
> ---
>  drivers/efi/efi-device.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 48 insertions(+)

Applied, thanks

Sascha

> 
> diff --git a/drivers/efi/efi-device.c b/drivers/efi/efi-device.c
> index 9975aea6f7..3a27323a00 100644
> --- a/drivers/efi/efi-device.c
> +++ b/drivers/efi/efi-device.c
> @@ -17,6 +17,7 @@
>   *
>   */
>  
> +#include <bootsource.h>
>  #include <command.h>
>  #include <common.h>
>  #include <driver.h>
> @@ -385,6 +386,51 @@ static int efi_is_setup_mode(void)
>  	return ret != 1;
>  }
>  
> +static int is_bio_usbdev(struct efi_device *efidev)
> +{
> +	int i;
> +
> +	for (i = 0; i < efidev->num_guids; i++) {
> +		if (!efi_guidcmp(efidev->guids[i], EFI_USB_IO_PROTOCOL_GUID))
> +			return 1;
> +	}
> +
> +	return 0;
> +}
> +
> +static void efi_set_bootsource(void)
> +{
> +	enum bootsource src = BOOTSOURCE_UNKNOWN;
> +	int instance = BOOTSOURCE_INSTANCE_UNKNOWN;
> +
> +	efi_handle_t *efi_parent;
> +	struct efi_device *bootdev;
> +
> +	if (!efi_loaded_image->parent_handle)
> +		goto out;
> +
> +	efi_parent = efi_find_parent(efi_loaded_image->device_handle);
> +
> +	if (!efi_parent)
> +		goto out;
> +
> +	bootdev = efi_find_device(efi_parent);
> +
> +	if (!bootdev)
> +		goto out;
> +
> +	if (is_bio_usbdev(bootdev)) {
> +		src = BOOTSOURCE_USB;
> +	} else {
> +		src = BOOTSOURCE_HD;
> +	}
> +
> +out:
> +
> +	bootsource_set(src);
> +	bootsource_set_instance(instance);
> +}
> +
>  static int efi_init_devices(void)
>  {
>  	char *fw_vendor = NULL;
> @@ -415,6 +461,8 @@ static int efi_init_devices(void)
>  
>  	efi_register_devices();
>  
> +	efi_set_bootsource();
> +
>  	return 0;
>  }
>  core_initcall(efi_init_devices);
> -- 
> 2.16.1
> 
> 
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> 

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