[PATCH v4 2/2] efi_loader: Reset system after CapsuleUpdate on disk

[AKASHI Takahiro]

On Thu, Feb 03, 2022 at 06:23:27PM +0900, Masami Hiramatsu wrote:
> Add a cold reset soon after processing capsule update on disk.
> This is required in UEFI specification 2.9 Section 8.5.5
> "Delivery of Capsules via file on Mass Storage device" as;
> 
>     In all cases that a capsule is identified for processing the system is
>     restarted after capsule processing is completed.

Once this behavior is enforced on U-Boot, CONFIG_EFI_CAPSULE_ON_DISK_EARLY
will make little sense. This option will have to always be set.
Otherwise, a user will see a sudden system reboot when he or she types
any of efi commands, like "env print -e".

-Takahiro Akashi


> This also reports the result of each capsule update so that the user can
> notice that the capsule update has been succeeded or not from console log.
> 
> Signed-off-by: Masami Hiramatsu <masami.hiramatsu at linaro.org>
> ---
>  Changes in v4:
>   - Do not use sysreset because that is a warm reset.
>   - Fix patch description.
> ---
>  lib/efi_loader/efi_capsule.c |   18 ++++++++++++++++--
>  1 file changed, 16 insertions(+), 2 deletions(-)
> 
> diff --git a/lib/efi_loader/efi_capsule.c b/lib/efi_loader/efi_capsule.c
> index 1ec7ea29ff..20d9490dbd 100644
> --- a/lib/efi_loader/efi_capsule.c
> +++ b/lib/efi_loader/efi_capsule.c
> @@ -14,6 +14,7 @@
>  #include <env.h>
>  #include <fdtdec.h>
>  #include <fs.h>
> +#include <hang.h>
>  #include <malloc.h>
>  #include <mapmem.h>
>  #include <sort.h>
> @@ -1120,8 +1121,11 @@ efi_status_t efi_launch_capsules(void)
>  		if (ret == EFI_SUCCESS) {
>  			ret = efi_capsule_update_firmware(capsule);
>  			if (ret != EFI_SUCCESS)
> -				log_err("Applying capsule %ls failed\n",
> +				log_err("Applying capsule %ls failed.\n",
>  					files[i]);
> +			else
> +				log_info("Applying capsule %ls succeeded.\n",
> +					 files[i]);
>  
>  			/* create CapsuleXXXX */
>  			set_capsule_result(index, capsule, ret);
> @@ -1142,6 +1146,16 @@ efi_status_t efi_launch_capsules(void)
>  		free(files[i]);
>  	free(files);
>  
> -	return ret;
> +	/*
> +	 * UEFI spec requires to reset system after complete processing capsule
> +	 * update on the storage.
> +	 */
> +	log_info("Reboot after firmware update");
> +	/* Cold reset is required for loading the new firmware. */
> +	do_reset(NULL, 0, 0, NULL);
> +	hang();
> +	/* not reach here */
> +
> +	return 0;
>  }
>  #endif /* CONFIG_EFI_CAPSULE_ON_DISK */
>