1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
/* SPDX-License-Identifier: MIT */
/*
* Copyright 2019 Advanced Micro Devices, Inc.
*/
#ifndef AMDTEE_PRIVATE_H
#define AMDTEE_PRIVATE_H
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/tee_drv.h>
#include <linux/kref.h>
#include <linux/types.h>
#include "amdtee_if.h"
#define DRIVER_NAME "amdtee"
#define DRIVER_AUTHOR "AMD-TEE Linux driver team"
/* Some GlobalPlatform error codes used in this driver */
#define TEEC_SUCCESS 0x00000000
#define TEEC_ERROR_GENERIC 0xFFFF0000
#define TEEC_ERROR_BAD_PARAMETERS 0xFFFF0006
#define TEEC_ERROR_COMMUNICATION 0xFFFF000E
#define TEEC_ORIGIN_COMMS 0x00000002
/* Maximum number of sessions which can be opened with a Trusted Application */
#define TEE_NUM_SESSIONS 32
#define TA_LOAD_PATH "/amdtee"
#define TA_PATH_MAX 60
/**
* struct amdtee - main service struct
* @teedev: client device
* @pool: shared memory pool
*/
struct amdtee {
struct tee_device *teedev;
struct tee_shm_pool *pool;
};
/**
* struct amdtee_session - Trusted Application (TA) session related information.
* @ta_handle: handle to Trusted Application (TA) loaded in TEE environment
* @refcount: counter to keep track of sessions opened for the TA instance
* @session_info: an array pointing to TA allocated session data.
* @sess_mask: session usage bit-mask. If a particular bit is set, then the
* corresponding @session_info entry is in use or valid.
*
* Session structure is updated on open_session and this information is used for
* subsequent operations with the Trusted Application.
*/
struct amdtee_session {
struct list_head list_node;
u32 ta_handle;
struct kref refcount;
u32 session_info[TEE_NUM_SESSIONS];
DECLARE_BITMAP(sess_mask, TEE_NUM_SESSIONS);
spinlock_t lock; /* synchronizes access to @sess_mask */
};
/**
* struct amdtee_context_data - AMD-TEE driver context data
* @sess_list: Keeps track of sessions opened in current TEE context
* @shm_list: Keeps track of buffers allocated and mapped in current TEE
* context
*/
struct amdtee_context_data {
struct list_head sess_list;
struct list_head shm_list;
struct mutex shm_mutex; /* synchronizes access to @shm_list */
};
struct amdtee_driver_data {
struct amdtee *amdtee;
};
struct shmem_desc {
void *kaddr;
u64 size;
};
/**
* struct amdtee_shm_data - Shared memory data
* @kaddr: Kernel virtual address of shared memory
* @buf_id: Buffer id of memory mapped by TEE_CMD_ID_MAP_SHARED_MEM
*/
struct amdtee_shm_data {
struct list_head shm_node;
void *kaddr;
u32 buf_id;
};
#define LOWER_TWO_BYTE_MASK 0x0000FFFF
/**
* set_session_id() - Sets the session identifier.
* @ta_handle: [in] handle of the loaded Trusted Application (TA)
* @session_index: [in] Session index. Range: 0 to (TEE_NUM_SESSIONS - 1).
* @session: [out] Pointer to session id
*
* Lower two bytes of the session identifier represents the TA handle and the
* upper two bytes is session index.
*/
static inline void set_session_id(u32 ta_handle, u32 session_index,
u32 *session)
{
*session = (session_index << 16) | (LOWER_TWO_BYTE_MASK & ta_handle);
}
static inline u32 get_ta_handle(u32 session)
{
return session & LOWER_TWO_BYTE_MASK;
}
static inline u32 get_session_index(u32 session)
{
return (session >> 16) & LOWER_TWO_BYTE_MASK;
}
int amdtee_open_session(struct tee_context *ctx,
struct tee_ioctl_open_session_arg *arg,
struct tee_param *param);
int amdtee_close_session(struct tee_context *ctx, u32 session);
int amdtee_invoke_func(struct tee_context *ctx,
struct tee_ioctl_invoke_arg *arg,
struct tee_param *param);
int amdtee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session);
int amdtee_map_shmem(struct tee_shm *shm);
void amdtee_unmap_shmem(struct tee_shm *shm);
int handle_load_ta(void *data, u32 size,
struct tee_ioctl_open_session_arg *arg);
int handle_unload_ta(u32 ta_handle);
int handle_open_session(struct tee_ioctl_open_session_arg *arg, u32 *info,
struct tee_param *p);
int handle_close_session(u32 ta_handle, u32 info);
int handle_map_shmem(u32 count, struct shmem_desc *start, u32 *buf_id);
void handle_unmap_shmem(u32 buf_id);
int handle_invoke_cmd(struct tee_ioctl_invoke_arg *arg, u32 sinfo,
struct tee_param *p);
struct tee_shm_pool *amdtee_config_shm(void);
u32 get_buffer_id(struct tee_shm *shm);
#endif /*AMDTEE_PRIVATE_H*/
|
