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Adds AMD-TEE driver. * targets AMD APUs which has AMD Secure Processor with software-based Trusted Execution Environment (TEE) support * registers with TEE subsystem * defines tee_driver_ops function callbacks * kernel allocated memory is used as shared memory between normal world and secure world. * acts as REE (Rich Execution Environment) communication agent, which uses the services of AMD Secure Processor driver to submit commands for processing in TEE environment 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>
160 lines
4.2 KiB
C
160 lines
4.2 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* Copyright 2019 Advanced Micro Devices, Inc.
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*/
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#ifndef AMDTEE_PRIVATE_H
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#define AMDTEE_PRIVATE_H
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#include <linux/mutex.h>
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#include <linux/spinlock.h>
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#include <linux/tee_drv.h>
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#include <linux/kref.h>
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#include <linux/types.h>
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#include "amdtee_if.h"
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#define DRIVER_NAME "amdtee"
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#define DRIVER_AUTHOR "AMD-TEE Linux driver team"
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/* Some GlobalPlatform error codes used in this driver */
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#define TEEC_SUCCESS 0x00000000
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#define TEEC_ERROR_GENERIC 0xFFFF0000
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#define TEEC_ERROR_BAD_PARAMETERS 0xFFFF0006
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#define TEEC_ERROR_COMMUNICATION 0xFFFF000E
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#define TEEC_ORIGIN_COMMS 0x00000002
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/* Maximum number of sessions which can be opened with a Trusted Application */
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#define TEE_NUM_SESSIONS 32
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#define TA_LOAD_PATH "/amdtee"
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#define TA_PATH_MAX 60
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/**
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* struct amdtee - main service struct
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* @teedev: client device
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* @pool: shared memory pool
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*/
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struct amdtee {
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struct tee_device *teedev;
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struct tee_shm_pool *pool;
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};
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/**
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* struct amdtee_session - Trusted Application (TA) session related information.
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* @ta_handle: handle to Trusted Application (TA) loaded in TEE environment
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* @refcount: counter to keep track of sessions opened for the TA instance
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* @session_info: an array pointing to TA allocated session data.
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* @sess_mask: session usage bit-mask. If a particular bit is set, then the
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* corresponding @session_info entry is in use or valid.
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*
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* Session structure is updated on open_session and this information is used for
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* subsequent operations with the Trusted Application.
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*/
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struct amdtee_session {
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struct list_head list_node;
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u32 ta_handle;
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struct kref refcount;
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u32 session_info[TEE_NUM_SESSIONS];
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DECLARE_BITMAP(sess_mask, TEE_NUM_SESSIONS);
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spinlock_t lock; /* synchronizes access to @sess_mask */
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};
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/**
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* struct amdtee_context_data - AMD-TEE driver context data
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* @sess_list: Keeps track of sessions opened in current TEE context
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*/
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struct amdtee_context_data {
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struct list_head sess_list;
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};
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struct amdtee_driver_data {
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struct amdtee *amdtee;
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};
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struct shmem_desc {
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void *kaddr;
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u64 size;
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};
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/**
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* struct amdtee_shm_data - Shared memory data
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* @kaddr: Kernel virtual address of shared memory
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* @buf_id: Buffer id of memory mapped by TEE_CMD_ID_MAP_SHARED_MEM
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*/
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struct amdtee_shm_data {
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struct list_head shm_node;
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void *kaddr;
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u32 buf_id;
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};
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struct amdtee_shm_context {
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struct list_head shmdata_list;
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};
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#define LOWER_TWO_BYTE_MASK 0x0000FFFF
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/**
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* set_session_id() - Sets the session identifier.
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* @ta_handle: [in] handle of the loaded Trusted Application (TA)
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* @session_index: [in] Session index. Range: 0 to (TEE_NUM_SESSIONS - 1).
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* @session: [out] Pointer to session id
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*
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* Lower two bytes of the session identifier represents the TA handle and the
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* upper two bytes is session index.
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*/
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static inline void set_session_id(u32 ta_handle, u32 session_index,
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u32 *session)
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{
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*session = (session_index << 16) | (LOWER_TWO_BYTE_MASK & ta_handle);
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}
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static inline u32 get_ta_handle(u32 session)
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{
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return session & LOWER_TWO_BYTE_MASK;
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}
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static inline u32 get_session_index(u32 session)
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{
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return (session >> 16) & LOWER_TWO_BYTE_MASK;
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}
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int amdtee_open_session(struct tee_context *ctx,
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struct tee_ioctl_open_session_arg *arg,
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struct tee_param *param);
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int amdtee_close_session(struct tee_context *ctx, u32 session);
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int amdtee_invoke_func(struct tee_context *ctx,
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struct tee_ioctl_invoke_arg *arg,
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struct tee_param *param);
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int amdtee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session);
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int amdtee_map_shmem(struct tee_shm *shm);
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void amdtee_unmap_shmem(struct tee_shm *shm);
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int handle_load_ta(void *data, u32 size,
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struct tee_ioctl_open_session_arg *arg);
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int handle_unload_ta(u32 ta_handle);
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int handle_open_session(struct tee_ioctl_open_session_arg *arg, u32 *info,
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struct tee_param *p);
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int handle_close_session(u32 ta_handle, u32 info);
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int handle_map_shmem(u32 count, struct shmem_desc *start, u32 *buf_id);
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void handle_unmap_shmem(u32 buf_id);
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int handle_invoke_cmd(struct tee_ioctl_invoke_arg *arg, u32 sinfo,
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struct tee_param *p);
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struct tee_shm_pool *amdtee_config_shm(void);
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u32 get_buffer_id(struct tee_shm *shm);
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#endif /*AMDTEE_PRIVATE_H*/
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