Re: [PATCH 2/2] tee: optee: discover services dependent on tee-supplicant

[Patrick DELAUNAY <patrick.delaunay@foss.st.com>]

Hi,

On 12/7/22 16:30, Etienne Carriere wrote:
> Makes OP-TEE to enumerate also services depending on tee-supplicant
> support in U-Boot. This change allows OP-TEE services like fTPM TA
> to be discovered and get a TPM device registered in U-Boot.
>
> Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
> ---
>   drivers/tee/optee/core.c | 32 +++++++++++++++++++++++---------
>   1 file changed, 23 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
> index 604fd1414f..b21031d7d8 100644
> --- a/drivers/tee/optee/core.c
> +++ b/drivers/tee/optee/core.c
> @@ -102,13 +102,14 @@ static int bind_service_list(struct udevice *dev, struct tee_shm *service_list,
>   	return 0;
>   }
>   
> -static int __enum_services(struct udevice *dev, struct tee_shm *shm, size_t *shm_size, u32 tee_sess)
> +static int __enum_services(struct udevice *dev, struct tee_shm *shm, size_t *shm_size, u32 tee_sess,
> +			   unsigned int pta_cmd)
>   {
>   	struct tee_invoke_arg arg = { };
>   	struct tee_param param = { };
>   	int ret = 0;
>   
> -	arg.func = PTA_CMD_GET_DEVICES;
> +	arg.func = pta_cmd;
>   	arg.session = tee_sess;
>   
>   	/* Fill invoke cmd params */
> @@ -118,7 +119,7 @@ static int __enum_services(struct udevice *dev, struct tee_shm *shm, size_t *shm
>   
>   	ret = tee_invoke_func(dev, &arg, 1, &param);
>   	if (ret || (arg.ret && arg.ret != TEE_ERROR_SHORT_BUFFER)) {
> -		dev_err(dev, "PTA_CMD_GET_DEVICES invoke function err: 0x%x\n", arg.ret);
> +		dev_err(dev, "Enumeration command 0x%x failed: 0x%x\n", pta_cmd, arg.ret);
>   		return -EINVAL;
>   	}
>   
> @@ -127,12 +128,13 @@ static int __enum_services(struct udevice *dev, struct tee_shm *shm, size_t *shm
>   	return 0;
>   }
>   
> -static int enum_services(struct udevice *dev, struct tee_shm **shm, size_t *count, u32 tee_sess)
> +static int enum_services(struct udevice *dev, struct tee_shm **shm, size_t *count, u32 tee_sess,
> +			 unsigned int pta_cmd)
>   {
>   	size_t shm_size = 0;
>   	int ret;
>   
> -	ret = __enum_services(dev, NULL, &shm_size, tee_sess);
> +	ret = __enum_services(dev, NULL, &shm_size, tee_sess, pta_cmd);
>   	if (ret)
>   		return ret;
>   
> @@ -142,7 +144,7 @@ static int enum_services(struct udevice *dev, struct tee_shm **shm, size_t *coun
>   		return ret;
>   	}
>   
> -	ret = __enum_services(dev, *shm, &shm_size, tee_sess);
> +	ret = __enum_services(dev, *shm, &shm_size, tee_sess, pta_cmd);
>   	if (!ret)
>   		*count = shm_size / sizeof(struct tee_optee_ta_uuid);
>   
> @@ -174,20 +176,32 @@ static int bind_service_drivers(struct udevice *dev)
>   	struct tee_shm *service_list = NULL;
>   	size_t service_count;
>   	u32 tee_sess;
> -	int ret;
> +	int ret, ret2;
>   
>   	ret = open_enum_session(dev, &tee_sess);
>   	if (ret)
>   		return ret;
>   
> -	ret = enum_services(dev, &service_list, &service_count, tee_sess);
> +	ret = enum_services(dev, &service_list, &service_count, tee_sess,
> +			    PTA_CMD_GET_DEVICES);
>   	if (!ret)
>   		ret = bind_service_list(dev, service_list, service_count);
>   
>   	tee_shm_free(service_list);

can you move part of duplicate code in enum_services() function ?
=> variables service_list and service_count
=> call to bind_service_list()
=> call to tee_shm_free(service_list);

then the call is more simple :

static int bind_service_drivers(struct udevice *dev)
  	u32 tee_sess;
	int ret, ret2;

  	ret = open_enum_session(dev, &tee_sess);
  	if (ret)
  		return ret;

	ret = enum_services(dev, tee_sess, PTA_CMD_GET_DEVICES);
	ret2 = enum_services(dev, tee_sess, PTA_CMD_GET_DEVICES_SUPP);

  	tee_close_session(dev, tee_sess);
  
	if (ret)
		return ret;

	return ret2;

}

> +
> +	ret2 = enum_services(dev, &service_list, &service_count, tee_sess,
> +			     PTA_CMD_GET_DEVICES_SUPP);
> +	if (!ret2)
> +		ret2 = bind_service_list(dev, service_list, service_count);
> +
> +	tee_shm_free(service_list);
> +
>   	tee_close_session(dev, tee_sess);
>   
> -	return ret;
> +	if (ret)
> +		return ret;
> +
> +	return ret2;
>   }
>   
>   /**

with or without


Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>

Thanks
Patrick