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https://github.com/AsahiLinux/u-boot
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57fb86a97d
Changes optee_rng driver to register itself has a OP-TEE service so that a device is bound for the driver when OP-TEE enumerates the PTA RNG service. Cc: Sughosh Ganu <sughosh.ganu@linaro.org> Cc: Patrick Delaunay <patrick.delaunay@foss.st.com> Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org> Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
189 lines
4.3 KiB
C
189 lines
4.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later OR BSD-3-Clause
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/*
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* Copyright (C) 2022, STMicroelectronics - All Rights Reserved
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*/
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#define LOG_CATEGORY UCLASS_RNG
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#include <common.h>
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#include <rng.h>
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#include <tee.h>
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#include <dm/device.h>
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#include <dm/device_compat.h>
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#include <linux/sizes.h>
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#include <tee/optee_service.h>
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#define DRIVER_NAME "optee-rng"
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#define TEE_ERROR_HEALTH_TEST_FAIL 0x00000001
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/*
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* TA_CMD_GET_ENTROPY - Get Entropy from RNG
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*
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* param[0] (inout memref) - Entropy buffer memory reference
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* param[1] unused
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* param[2] unused
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* param[3] unused
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*
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* Result:
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* TEE_SUCCESS - Invoke command success
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* TEE_ERROR_BAD_PARAMETERS - Incorrect input param
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* TEE_ERROR_NOT_SUPPORTED - Requested entropy size greater than size of pool
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* TEE_ERROR_HEALTH_TEST_FAIL - Continuous health testing failed
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*/
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#define TA_CMD_GET_ENTROPY 0x0
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#define MAX_ENTROPY_REQ_SZ SZ_4K
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#define TA_HWRNG_UUID { 0xab7a617c, 0xb8e7, 0x4d8f, \
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{ 0x83, 0x01, 0xd0, 0x9b, 0x61, 0x03, 0x6b, 0x64 } }
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OPTEE_SERVICE_DRIVER(optee_rng, TA_HWRNG_UUID, DRIVER_NAME);
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/** open_session_ta_hwrng() - Open session with hwrng Trusted App
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*
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* @dev: device
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* @session_id: return the RNG TA session identifier
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* Return: 0 if ok
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*/
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static int open_session_ta_hwrng(struct udevice *dev, u32 *session_id)
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{
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const struct tee_optee_ta_uuid uuid = TA_HWRNG_UUID;
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struct tee_open_session_arg sess_arg = {0};
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int ret;
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/* Open session with hwrng Trusted App */
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tee_optee_ta_uuid_to_octets(sess_arg.uuid, &uuid);
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sess_arg.clnt_login = TEE_LOGIN_PUBLIC;
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ret = tee_open_session(dev->parent, &sess_arg, 0, NULL);
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if (ret || sess_arg.ret) {
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if (!ret)
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ret = -EIO;
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return ret;
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}
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*session_id = sess_arg.session;
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return 0;
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}
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/**
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* get_optee_rng_data() - read RNG data from OP-TEE TA
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*
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* @dev: device
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* @session_id: the RNG TA session identifier
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* @entropy_shm_pool: shared memory pool used for TEE message
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* @buf: buffer to receive data
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* @size: size of buffer, limited by entropy_shm_pool size
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* Return: 0 if ok
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*/
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static int get_optee_rng_data(struct udevice *dev, u32 session_id,
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struct tee_shm *entropy_shm_pool,
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void *buf, size_t *size)
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{
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int ret = 0;
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struct tee_invoke_arg arg = {0};
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struct tee_param param = {0};
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/* Invoke TA_CMD_GET_ENTROPY function of Trusted App */
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arg.func = TA_CMD_GET_ENTROPY;
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arg.session = session_id;
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/* Fill invoke cmd params */
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param.attr = TEE_PARAM_ATTR_TYPE_MEMREF_INOUT;
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param.u.memref.shm = entropy_shm_pool;
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param.u.memref.size = *size;
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ret = tee_invoke_func(dev->parent, &arg, 1, ¶m);
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if (ret || arg.ret) {
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if (!ret)
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ret = -EPROTO;
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dev_err(dev, "TA_CMD_GET_ENTROPY invoke err: %d 0x%x\n", ret, arg.ret);
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*size = 0;
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return ret;
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}
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memcpy(buf, param.u.memref.shm->addr, param.u.memref.size);
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*size = param.u.memref.size;
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return 0;
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}
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/**
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* optee_rng_read() - rng read ops for OP-TEE RNG device
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*
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* @dev: device
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* @buf: buffer to receive data
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* @len: size of buffer
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* Return: 0 if ok
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*/
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static int optee_rng_read(struct udevice *dev, void *buf, size_t len)
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{
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size_t read = 0, rng_size = 0;
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struct tee_shm *entropy_shm_pool;
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u8 *data = buf;
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int ret;
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u32 session_id = 0;
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ret = open_session_ta_hwrng(dev, &session_id);
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if (ret) {
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dev_err(dev, "can't open session: %d\n", ret);
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return ret;
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}
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ret = tee_shm_alloc(dev->parent, MAX_ENTROPY_REQ_SZ, 0, &entropy_shm_pool);
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if (ret) {
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dev_err(dev, "tee_shm_alloc failed: %d\n", ret);
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goto session_close;
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}
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while (read < len) {
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rng_size = min(len - read, (size_t)MAX_ENTROPY_REQ_SZ);
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ret = get_optee_rng_data(dev, session_id, entropy_shm_pool, data, &rng_size);
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if (ret)
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goto shm_free;
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data += rng_size;
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read += rng_size;
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}
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shm_free:
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tee_shm_free(entropy_shm_pool);
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session_close:
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tee_close_session(dev->parent, session_id);
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return ret;
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}
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/**
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* optee_rng_probe() - probe function for OP-TEE RNG device
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*
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* @dev: device
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* Return: 0 if ok
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*/
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static int optee_rng_probe(struct udevice *dev)
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{
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int ret;
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u32 session_id;
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ret = open_session_ta_hwrng(dev, &session_id);
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if (ret) {
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dev_err(dev, "can't open session: %d\n", ret);
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return ret;
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}
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tee_close_session(dev->parent, session_id);
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return 0;
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}
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static const struct dm_rng_ops optee_rng_ops = {
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.read = optee_rng_read,
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};
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U_BOOT_DRIVER(optee_rng) = {
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.name = DRIVER_NAME,
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.id = UCLASS_RNG,
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.ops = &optee_rng_ops,
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.probe = optee_rng_probe,
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};
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