[U-Boot] [PATCH v6 4/7] cmd: efidebug: add drivers command

[Heinrich Schuchardt]

On 1/24/19 12:04 PM, AKASHI Takahiro wrote:
> "drivers" command prints all the uefi drivers on the system.
> 
> => efi drivers
> Driver           Name                 Image Path
> ================ ==================== ====================
> 000000007ef003d0 <NULL>               <built-in>
> 
> Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
> ---
>  cmd/efidebug.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 79 insertions(+), 1 deletion(-)
> 
> diff --git a/cmd/efidebug.c b/cmd/efidebug.c
> index 8a7f775b117a..1b788c76a895 100644
> --- a/cmd/efidebug.c
> +++ b/cmd/efidebug.c
> @@ -111,6 +111,80 @@ static int do_efi_show_devices(cmd_tbl_t *cmdtp, int flag,
>  	return CMD_RET_SUCCESS;
>  }
>  
> +static int efi_get_driver_handle_info(efi_handle_t handle, u16 **driver_name,
> +				      u16 **image_path)
> +{
> +	struct efi_handler *handler;
> +	struct efi_loaded_image *image;
> +	efi_status_t ret;
> +
> +	/*
> +	 * driver name
> +	 * TODO: support EFI_COMPONENT_NAME2_PROTOCOL
> +	 */
> +	*driver_name = NULL;
> +
> +	/* image name */
> +	ret = efi_search_protocol(handle, &efi_guid_loaded_image, &handler);
> +	if (ret != EFI_SUCCESS) {
> +		*image_path = NULL;
> +		return 0;
> +	}
> +
> +	image = handler->protocol_interface;
> +	*image_path = efi_dp_str(image->file_path);
> +
> +	return 0;
> +}
> +
> +static int do_efi_show_drivers(cmd_tbl_t *cmdtp, int flag,
> +			       int argc, char * const argv[])
> +{
> +	efi_handle_t *handles = NULL, *handle;
> +	efi_uintn_t size = 0;
> +	u16 *driver_name, *image_path_text;
> +	efi_status_t ret;
> +	int i;
> +

You are duplicating the logic of LocateHandleBuffer(). Why?

> +	ret = BS->locate_handle(BY_PROTOCOL, &efi_guid_driver_binding_protocol,
> +				NULL, &size, NULL);
> +	if (ret == EFI_BUFFER_TOO_SMALL) {
> +		handles = calloc(1, size);
> +		if (!handles)
> +			return CMD_RET_FAILURE;
> +
> +		ret = BS->locate_handle(BY_PROTOCOL,
> +					&efi_guid_driver_binding_protocol,
> +					NULL, &size, handles);
> +	}
> +	if (ret != EFI_SUCCESS) {
> +		free(handles);
> +		return CMD_RET_FAILURE;
> +	}
> +
> +	printf("Driver%.*s Name                 Image Path\n",
> +	       EFI_HANDLE_WIDTH - 6, spc);
> +	printf("%.*s ==================== ====================\n",
> +	       EFI_HANDLE_WIDTH, sep);
> +	handle = handles;
> +	for (i = 0; i < size / sizeof(*handle); i++) {
> +		if (!efi_get_driver_handle_info(*handle, &driver_name,
> +						&image_path_text)) {
> +			if (image_path_text)
> +				printf("%p %-20ls %ls\n",
> +				       *handle, driver_name, image_path_text);
> +			else
> +				printf("%p %-20ls <built-in>\n",
> +				       *handle, driver_name);
> +			efi_free_pool(driver_name);
> +			efi_free_pool(image_path_text);
> +		}
> +		handle++;
> +	}
> +

You are leaking 'handles' here.

Best regards

Heinrich

> +	return CMD_RET_SUCCESS;
> +}
> +
>  static int do_efi_boot_add(cmd_tbl_t *cmdtp, int flag,
>  			   int argc, char * const argv[])
>  {
> @@ -504,6 +578,8 @@ 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,
>  			 "", ""),
> +	U_BOOT_CMD_MKENT(drivers, CONFIG_SYS_MAXARGS, 1, do_efi_show_drivers,
> +			 "", ""),
>  };
>  
>  /* Interpreter command to configure UEFI environment */
> @@ -551,7 +627,9 @@ static char efidebug_help_text[] =
>  	"  - set/show UEFI boot order\n"
>  	"\n"
>  	"efidebug devices\n"
> -	"  - show uefi devices\n";
> +	"  - show uefi devices\n"
> +	"efidebug drivers\n"
> +	"  - show uefi drivers\n";
>  #endif
>  
>  U_BOOT_CMD(
>