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bade7e1fbd
The AMD-TEE driver should check if TEE is available before registering itself with TEE subsystem. This ensures that there is a TEE which the driver can talk to before proceeding with tee device node allocation. Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Tom Lendacky <thomas.lendacky@amd.com> Acked-by: Jens Wiklander <jens.wiklander@linaro.org> Co-developed-by: Devaraj Rangasamy <Devaraj.Rangasamy@amd.com> Signed-off-by: Devaraj Rangasamy <Devaraj.Rangasamy@amd.com> Signed-off-by: Rijo Thomas <Rijo-john.Thomas@amd.com> Reviewed-by: Gary R Hook <gary.hook@amd.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* AMD Trusted Execution Environment (TEE) interface
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*
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* Author: Rijo Thomas <Rijo-john.Thomas@amd.com>
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*
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* Copyright 2019 Advanced Micro Devices, Inc.
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*
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*/
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#ifndef __PSP_TEE_H_
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#define __PSP_TEE_H_
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#include <linux/types.h>
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#include <linux/errno.h>
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/* This file defines the Trusted Execution Environment (TEE) interface commands
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* and the API exported by AMD Secure Processor driver to communicate with
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* AMD-TEE Trusted OS.
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*/
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/**
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* enum tee_cmd_id - TEE Interface Command IDs
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* @TEE_CMD_ID_LOAD_TA: Load Trusted Application (TA) binary into
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* TEE environment
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* @TEE_CMD_ID_UNLOAD_TA: Unload TA binary from TEE environment
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* @TEE_CMD_ID_OPEN_SESSION: Open session with loaded TA
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* @TEE_CMD_ID_CLOSE_SESSION: Close session with loaded TA
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* @TEE_CMD_ID_INVOKE_CMD: Invoke a command with loaded TA
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* @TEE_CMD_ID_MAP_SHARED_MEM: Map shared memory
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* @TEE_CMD_ID_UNMAP_SHARED_MEM: Unmap shared memory
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*/
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enum tee_cmd_id {
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TEE_CMD_ID_LOAD_TA = 1,
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TEE_CMD_ID_UNLOAD_TA,
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TEE_CMD_ID_OPEN_SESSION,
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TEE_CMD_ID_CLOSE_SESSION,
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TEE_CMD_ID_INVOKE_CMD,
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TEE_CMD_ID_MAP_SHARED_MEM,
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TEE_CMD_ID_UNMAP_SHARED_MEM,
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};
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#ifdef CONFIG_CRYPTO_DEV_SP_PSP
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/**
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* psp_tee_process_cmd() - Process command in Trusted Execution Environment
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* @cmd_id: TEE command ID (&enum tee_cmd_id)
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* @buf: Command buffer for TEE processing. On success, is updated
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* with the response
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* @len: Length of command buffer in bytes
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* @status: On success, holds the TEE command execution status
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*
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* This function submits a command to the Trusted OS for processing in the
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* TEE environment and waits for a response or until the command times out.
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*
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* Returns:
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* 0 if TEE successfully processed the command
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* -%ENODEV if PSP device not available
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* -%EINVAL if invalid input
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* -%ETIMEDOUT if TEE command timed out
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* -%EBUSY if PSP device is not responsive
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*/
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int psp_tee_process_cmd(enum tee_cmd_id cmd_id, void *buf, size_t len,
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u32 *status);
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/**
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* psp_check_tee_status() - Checks whether there is a TEE which a driver can
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* talk to.
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*
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* This function can be used by AMD-TEE driver to query if there is TEE with
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* which it can communicate.
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*
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* Returns:
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* 0 if the device has TEE
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* -%ENODEV if there is no TEE available
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*/
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int psp_check_tee_status(void);
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#else /* !CONFIG_CRYPTO_DEV_SP_PSP */
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static inline int psp_tee_process_cmd(enum tee_cmd_id cmd_id, void *buf,
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size_t len, u32 *status)
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{
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return -ENODEV;
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}
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static inline int psp_check_tee_status(void)
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{
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return -ENODEV;
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}
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#endif /* CONFIG_CRYPTO_DEV_SP_PSP */
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#endif /* __PSP_TEE_H_ */
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