mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 11:19:37 +00:00
![Rijo Thomas](/assets/img/avatar_default.png)
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>
91 lines
2.7 KiB
C
91 lines
2.7 KiB
C
/* SPDX-License-Identifier: MIT */
|
|
/*
|
|
* AMD Trusted Execution Environment (TEE) interface
|
|
*
|
|
* Author: Rijo Thomas <Rijo-john.Thomas@amd.com>
|
|
*
|
|
* 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_ */
|