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/* SPDX-License-Identifier: MIT */
/*
* AMD Trusted Execution Environment (TEE) interface
*
* Author: Rijo Thomas <[email protected]>
*
* Copyright 2019 Advanced Micro Devices, Inc.
*
*/
#ifndef __PSP_TEE_H_
#define __PSP_TEE_H_
#include <linux/types.h>
#include <linux/errno.h>
/* This file defines the Trusted Execution Environment (TEE) interface commands
* and the API exported by AMD Secure Processor driver to communicate with
* AMD-TEE Trusted OS.
*/
/**
* enum tee_cmd_id - TEE Interface Command IDs
* @TEE_CMD_ID_LOAD_TA: Load Trusted Application (TA) binary into
* TEE environment
* @TEE_CMD_ID_UNLOAD_TA: Unload TA binary from TEE environment
* @TEE_CMD_ID_OPEN_SESSION: Open session with loaded TA
* @TEE_CMD_ID_CLOSE_SESSION: Close session with loaded TA
* @TEE_CMD_ID_INVOKE_CMD: Invoke a command with loaded TA
* @TEE_CMD_ID_MAP_SHARED_MEM: Map shared memory
* @TEE_CMD_ID_UNMAP_SHARED_MEM: Unmap shared memory
*/
enum tee_cmd_id {
TEE_CMD_ID_LOAD_TA = 1,
TEE_CMD_ID_UNLOAD_TA,
TEE_CMD_ID_OPEN_SESSION,
TEE_CMD_ID_CLOSE_SESSION,
TEE_CMD_ID_INVOKE_CMD,
TEE_CMD_ID_MAP_SHARED_MEM,
TEE_CMD_ID_UNMAP_SHARED_MEM,
};
#ifdef CONFIG_CRYPTO_DEV_SP_PSP
/**
* psp_tee_process_cmd() - Process command in Trusted Execution Environment
* @cmd_id: TEE command ID (&enum tee_cmd_id)
* @buf: Command buffer for TEE processing. On success, is updated
* with the response
* @len: Length of command buffer in bytes
* @status: On success, holds the TEE command execution status
*
* This function submits a command to the Trusted OS for processing in the
* TEE environment and waits for a response or until the command times out.
*
* Returns:
* 0 if TEE successfully processed the command
* -%ENODEV if PSP device not available
* -%EINVAL if invalid input
* -%ETIMEDOUT if TEE command timed out
* -%EBUSY if PSP device is not responsive
*/
int psp_tee_process_cmd(enum tee_cmd_id cmd_id, void *buf, size_t len,
u32 *status);
/**
* psp_check_tee_status() - Checks whether there is a TEE which a driver can
* talk to.
*
* This function can be used by AMD-TEE driver to query if there is TEE with
* which it can communicate.
*
* Returns:
* 0 if the device has TEE
* -%ENODEV if there is no TEE available
*/
int psp_check_tee_status(void);
#else /* !CONFIG_CRYPTO_DEV_SP_PSP */
static inline int psp_tee_process_cmd(enum tee_cmd_id cmd_id, void *buf,
size_t len, u32 *status)
{
return -ENODEV;
}
static inline int psp_check_tee_status(void)
{
return -ENODEV;
}
#endif /* CONFIG_CRYPTO_DEV_SP_PSP */
#endif /* __PSP_TEE_H_ */
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