[PATCH 3/5 v2] cmd: efidebug: Add support for querying UEFI variable storage

[Heinrich Schuchardt <xypron.glpk@gmx.de>]

On 5/11/20 8:14 PM, Ilias Apalodimas wrote:
> With the previous patches that use OP-TEE and StandAloneMM for UEFI
> variable storage we've added functionality for efi_query_variable_info.
> So let's add the relevant command to efidebug and retrieve information
> about the container used to store UEFI variables
>
> Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

For now attributes (e.g. EFI_VARIABLE_NON_VOLATILE) cannot be passed to
the 'efidebug query' sub-command instead a fixed value is used. We can
add attributes on the command line later.

> ---
>  cmd/efidebug.c | 44 +++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 43 insertions(+), 1 deletion(-)
>
> diff --git a/cmd/efidebug.c b/cmd/efidebug.c
> index d8a76d78a388..a3980772c934 100644
> --- a/cmd/efidebug.c
> +++ b/cmd/efidebug.c
> @@ -1160,6 +1160,44 @@ static int do_efi_test(cmd_tbl_t *cmdtp, int flag,
>  	return cp->cmd(cmdtp, flag, argc, argv);
>  }
>
> +/**
> + * do_efi_query_info() - QueryVariableInfo EFI service
> + *
> + * @cmdtp:	Command table
> + * @flag:	Command flag
> + * @argc:	Number of arguments
> + * @argv:	Argument array
> + * Return:	CMD_RET_SUCCESS on success,
> + *		CMD_RET_USAGE or CMD_RET_FAILURE on failure
> + *
> + * Implement efidebug "test" sub-command.
> + */
> +
> +static int do_efi_query_info(cmd_tbl_t *cmdtp, int flag,
> +			     int argc, char * const argv[])
> +{
> +	efi_status_t ret;
> +	u32 attr = EFI_VARIABLE_BOOTSERVICE_ACCESS |
> +			EFI_VARIABLE_RUNTIME_ACCESS |
> +			EFI_VARIABLE_NON_VOLATILE;

As we do not support variables at runtime currently shouldn't we remove
EFI_VARIABLE_RUNTIME_ACCESS from the default value? I could do that when
merging.

Otherwise:

Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>


> +	u64 max_variable_storage_size;
> +	u64 remain_variable_storage_size;
> +	u64 max_variable_size;
> +
> +	ret = EFI_CALL(efi_query_variable_info(attr,
> +					       &max_variable_storage_size,
> +					       &remain_variable_storage_size,
> +					       &max_variable_size));
> +	if (ret != EFI_SUCCESS)
> +		return CMD_RET_FAILURE;
> +
> +	printf("Max storage size %llu\n", max_variable_storage_size);
> +	printf("Remaining storage size %llu\n", remain_variable_storage_size);
> +	printf("Max variable size %llu\n", max_variable_size);
> +
> +	return CMD_RET_SUCCESS;
> +}
> +
>  static cmd_tbl_t cmd_efidebug_sub[] = {
>  	U_BOOT_CMD_MKENT(boot, CONFIG_SYS_MAXARGS, 1, do_efi_boot_opt, "", ""),
>  	U_BOOT_CMD_MKENT(devices, CONFIG_SYS_MAXARGS, 1, do_efi_show_devices,
> @@ -1176,6 +1214,8 @@ static cmd_tbl_t cmd_efidebug_sub[] = {
>  			 "", ""),
>  	U_BOOT_CMD_MKENT(test, CONFIG_SYS_MAXARGS, 1, do_efi_test,
>  			 "", ""),
> +	U_BOOT_CMD_MKENT(query, CONFIG_SYS_MAXARGS, 1, do_efi_query_info,
> +			 "", ""),
>  };
>
>  /**
> @@ -1247,7 +1287,9 @@ static char efidebug_help_text[] =
>  	"efidebug tables\n"
>  	"  - show UEFI configuration tables\n"
>  	"efidebug test bootmgr\n"
> -	"  - run simple bootmgr for test\n";
> +	"  - run simple bootmgr for test\n"
> +	"efidebug query\n"
> +	"  - show size of UEFI variables store\n";
>  #endif
>
>  U_BOOT_CMD(
>