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![Patrick Delaunay](/assets/img/avatar_default.png)
For boot with OP-TEE on STM32MP13, the communication with the secure world no more use STMicroelectronics SMC but communication with the STM32MP BSEC TA, for data access (read/write) or lock operation: - all the request are sent to OP-TEE trusted application, - for upper OTP with ECC protection and with word programming only each OTP are permanently locked when programmed to avoid ECC error on the second write operation Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com> Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20230206134356.839737-18-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
298 lines
7.5 KiB
C
298 lines
7.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* OP-TEE STM32MP BSEC PTA interface, used by STM32 ROMEM driver
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*
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* Copyright (C) 2022, STMicroelectronics - All Rights Reserved
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*/
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#include <linux/tee_drv.h>
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#include "stm32-bsec-optee-ta.h"
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/*
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* Read OTP memory
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*
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* [in] value[0].a OTP start offset in byte
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* [in] value[0].b Access type (0:shadow, 1:fuse, 2:lock)
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* [out] memref[1].buffer Output buffer to store read values
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* [out] memref[1].size Size of OTP to be read
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*
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* Return codes:
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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_ACCESS_DENIED - OTP not accessible by caller
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*/
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#define PTA_BSEC_READ_MEM 0x0
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/*
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* Write OTP memory
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*
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* [in] value[0].a OTP start offset in byte
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* [in] value[0].b Access type (0:shadow, 1:fuse, 2:lock)
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* [in] memref[1].buffer Input buffer to read values
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* [in] memref[1].size Size of OTP to be written
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*
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* Return codes:
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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_ACCESS_DENIED - OTP not accessible by caller
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*/
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#define PTA_BSEC_WRITE_MEM 0x1
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/* value of PTA_BSEC access type = value[in] b */
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#define SHADOW_ACCESS 0
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#define FUSE_ACCESS 1
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#define LOCK_ACCESS 2
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/* Bitfield definition for LOCK status */
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#define LOCK_PERM BIT(30)
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/* OP-TEE STM32MP BSEC TA UUID */
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static const uuid_t stm32mp_bsec_ta_uuid =
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UUID_INIT(0x94cf71ad, 0x80e6, 0x40b5,
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0xa7, 0xc6, 0x3d, 0xc5, 0x01, 0xeb, 0x28, 0x03);
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/*
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* Check whether this driver supports the BSEC TA in the TEE instance
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* represented by the params (ver/data) to this function.
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*/
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static int stm32_bsec_optee_ta_match(struct tee_ioctl_version_data *ver,
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const void *data)
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{
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/* Currently this driver only supports GP compliant, OP-TEE based TA */
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if ((ver->impl_id == TEE_IMPL_ID_OPTEE) &&
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(ver->gen_caps & TEE_GEN_CAP_GP))
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return 1;
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else
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return 0;
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}
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/* Open a session to OP-TEE for STM32MP BSEC TA */
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static int stm32_bsec_ta_open_session(struct tee_context *ctx, u32 *id)
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{
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struct tee_ioctl_open_session_arg sess_arg;
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int rc;
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memset(&sess_arg, 0, sizeof(sess_arg));
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export_uuid(sess_arg.uuid, &stm32mp_bsec_ta_uuid);
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sess_arg.clnt_login = TEE_IOCTL_LOGIN_REE_KERNEL;
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sess_arg.num_params = 0;
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rc = tee_client_open_session(ctx, &sess_arg, NULL);
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if ((rc < 0) || (sess_arg.ret != 0)) {
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pr_err("%s: tee_client_open_session failed err:%#x, ret:%#x\n",
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__func__, sess_arg.ret, rc);
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if (!rc)
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rc = -EINVAL;
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} else {
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*id = sess_arg.session;
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}
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return rc;
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}
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/* close a session to OP-TEE for STM32MP BSEC TA */
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static void stm32_bsec_ta_close_session(void *ctx, u32 id)
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{
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tee_client_close_session(ctx, id);
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}
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/* stm32_bsec_optee_ta_open() - initialize the STM32MP BSEC TA */
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int stm32_bsec_optee_ta_open(struct tee_context **ctx)
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{
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struct tee_context *tee_ctx;
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u32 session_id;
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int rc;
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/* Open context with TEE driver */
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tee_ctx = tee_client_open_context(NULL, stm32_bsec_optee_ta_match, NULL, NULL);
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if (IS_ERR(tee_ctx)) {
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rc = PTR_ERR(tee_ctx);
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if (rc == -ENOENT)
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return -EPROBE_DEFER;
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pr_err("%s: tee_client_open_context failed (%d)\n", __func__, rc);
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return rc;
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}
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/* Check STM32MP BSEC TA presence */
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rc = stm32_bsec_ta_open_session(tee_ctx, &session_id);
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if (rc) {
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tee_client_close_context(tee_ctx);
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return rc;
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}
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stm32_bsec_ta_close_session(tee_ctx, session_id);
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*ctx = tee_ctx;
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return 0;
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}
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/* stm32_bsec_optee_ta_open() - release the PTA STM32MP BSEC TA */
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void stm32_bsec_optee_ta_close(void *ctx)
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{
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tee_client_close_context(ctx);
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}
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/* stm32_bsec_optee_ta_read() - nvmem read access using PTA client driver */
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int stm32_bsec_optee_ta_read(struct tee_context *ctx, unsigned int offset,
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void *buf, size_t bytes)
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{
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struct tee_shm *shm;
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struct tee_ioctl_invoke_arg arg;
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struct tee_param param[2];
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u8 *shm_buf;
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u32 start, num_bytes;
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int ret;
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u32 session_id;
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ret = stm32_bsec_ta_open_session(ctx, &session_id);
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if (ret)
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return ret;
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memset(&arg, 0, sizeof(arg));
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memset(¶m, 0, sizeof(param));
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arg.func = PTA_BSEC_READ_MEM;
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arg.session = session_id;
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arg.num_params = 2;
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/* align access on 32bits */
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start = ALIGN_DOWN(offset, 4);
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num_bytes = round_up(offset + bytes - start, 4);
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param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;
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param[0].u.value.a = start;
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param[0].u.value.b = SHADOW_ACCESS;
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shm = tee_shm_alloc_kernel_buf(ctx, num_bytes);
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if (IS_ERR(shm)) {
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ret = PTR_ERR(shm);
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goto out_tee_session;
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}
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param[1].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT;
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param[1].u.memref.shm = shm;
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param[1].u.memref.size = num_bytes;
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ret = tee_client_invoke_func(ctx, &arg, param);
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if (ret < 0 || arg.ret != 0) {
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pr_err("TA_BSEC invoke failed TEE err:%#x, ret:%#x\n",
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arg.ret, ret);
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if (!ret)
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ret = -EIO;
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}
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if (!ret) {
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shm_buf = tee_shm_get_va(shm, 0);
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if (IS_ERR(shm_buf)) {
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ret = PTR_ERR(shm_buf);
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pr_err("tee_shm_get_va failed for transmit (%d)\n", ret);
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} else {
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/* read data from 32 bits aligned buffer */
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memcpy(buf, &shm_buf[offset % 4], bytes);
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}
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}
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tee_shm_free(shm);
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out_tee_session:
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stm32_bsec_ta_close_session(ctx, session_id);
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return ret;
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}
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/* stm32_bsec_optee_ta_write() - nvmem write access using PTA client driver */
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int stm32_bsec_optee_ta_write(struct tee_context *ctx, unsigned int lower,
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unsigned int offset, void *buf, size_t bytes)
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{ struct tee_shm *shm;
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struct tee_ioctl_invoke_arg arg;
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struct tee_param param[2];
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u8 *shm_buf;
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int ret;
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u32 session_id;
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ret = stm32_bsec_ta_open_session(ctx, &session_id);
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if (ret)
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return ret;
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/* Allow only writing complete 32-bits aligned words */
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if ((bytes % 4) || (offset % 4))
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return -EINVAL;
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memset(&arg, 0, sizeof(arg));
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memset(¶m, 0, sizeof(param));
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arg.func = PTA_BSEC_WRITE_MEM;
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arg.session = session_id;
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arg.num_params = 2;
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param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;
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param[0].u.value.a = offset;
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param[0].u.value.b = FUSE_ACCESS;
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shm = tee_shm_alloc_kernel_buf(ctx, bytes);
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if (IS_ERR(shm)) {
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ret = PTR_ERR(shm);
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goto out_tee_session;
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}
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param[1].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT;
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param[1].u.memref.shm = shm;
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param[1].u.memref.size = bytes;
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shm_buf = tee_shm_get_va(shm, 0);
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if (IS_ERR(shm_buf)) {
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ret = PTR_ERR(shm_buf);
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pr_err("tee_shm_get_va failed for transmit (%d)\n", ret);
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tee_shm_free(shm);
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goto out_tee_session;
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}
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memcpy(shm_buf, buf, bytes);
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ret = tee_client_invoke_func(ctx, &arg, param);
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if (ret < 0 || arg.ret != 0) {
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pr_err("TA_BSEC invoke failed TEE err:%#x, ret:%#x\n", arg.ret, ret);
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if (!ret)
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ret = -EIO;
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}
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pr_debug("Write OTPs %d to %zu, ret=%d\n", offset / 4, (offset + bytes) / 4, ret);
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/* Lock the upper OTPs with ECC protection, word programming only */
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if (!ret && ((offset + bytes) >= (lower * 4))) {
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u32 start, nb_lock;
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u32 *lock = (u32 *)shm_buf;
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int i;
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/*
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* don't lock the lower OTPs, no ECC protection and incremental
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* bit programming, a second write is allowed
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*/
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start = max_t(u32, offset, lower * 4);
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nb_lock = (offset + bytes - start) / 4;
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param[0].u.value.a = start;
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param[0].u.value.b = LOCK_ACCESS;
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param[1].u.memref.size = nb_lock * 4;
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for (i = 0; i < nb_lock; i++)
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lock[i] = LOCK_PERM;
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ret = tee_client_invoke_func(ctx, &arg, param);
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if (ret < 0 || arg.ret != 0) {
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pr_err("TA_BSEC invoke failed TEE err:%#x, ret:%#x\n", arg.ret, ret);
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if (!ret)
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ret = -EIO;
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}
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pr_debug("Lock upper OTPs %d to %d, ret=%d\n",
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start / 4, start / 4 + nb_lock, ret);
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}
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tee_shm_free(shm);
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out_tee_session:
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stm32_bsec_ta_close_session(ctx, session_id);
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return ret;
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}
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