drivers/tee/amdtee/amdtee_private.h

   1 /* SPDX-License-Identifier: MIT */
   2
   3 /*
   4  * Copyright 2019 Advanced Micro Devices, Inc.
   5  */
   6
   7 #ifndef AMDTEE_PRIVATE_H
   8 #define AMDTEE_PRIVATE_H
   9
  10 #include <linux/mutex.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/tee_core.h>
  13 #include <linux/kref.h>
  14 #include <linux/types.h>
  15 #include "amdtee_if.h"
  16
  17 #define DRIVER_NAME     "amdtee"
  18 #define DRIVER_AUTHOR   "AMD-TEE Linux driver team"
  19
  20 /* Some GlobalPlatform error codes used in this driver */
  21 #define TEEC_SUCCESS                    0x00000000
  22 #define TEEC_ERROR_GENERIC              0xFFFF0000
  23 #define TEEC_ERROR_BAD_PARAMETERS       0xFFFF0006
  24 #define TEEC_ERROR_OUT_OF_MEMORY        0xFFFF000C
  25 #define TEEC_ERROR_COMMUNICATION        0xFFFF000E
  26
  27 #define TEEC_ORIGIN_COMMS               0x00000002
  28
  29 /* Maximum number of sessions which can be opened with a Trusted Application */
  30 #define TEE_NUM_SESSIONS                        32
  31
  32 #define TA_LOAD_PATH                            "/amdtee"
  33 #define TA_PATH_MAX                             60
  34
  35 /**
  36  * struct amdtee - main service struct
  37  * @teedev:             client device
  38  * @pool:               shared memory pool
  39  */
  40 struct amdtee {
  41         struct tee_device *teedev;
  42         struct tee_shm_pool *pool;
  43 };
  44
  45 /**
  46  * struct amdtee_session - Trusted Application (TA) session related information.
  47  * @ta_handle:     handle to Trusted Application (TA) loaded in TEE environment
  48  * @refcount:      counter to keep track of sessions opened for the TA instance
  49  * @session_info:  an array pointing to TA allocated session data.
  50  * @sess_mask:     session usage bit-mask. If a particular bit is set, then the
  51  *                 corresponding @session_info entry is in use or valid.
  52  *
  53  * Session structure is updated on open_session and this information is used for
  54  * subsequent operations with the Trusted Application.
  55  */
  56 struct amdtee_session {
  57         struct list_head list_node;
  58         u32 ta_handle;
  59         struct kref refcount;
  60         u32 session_info[TEE_NUM_SESSIONS];
  61         DECLARE_BITMAP(sess_mask, TEE_NUM_SESSIONS);
  62         spinlock_t lock;        /* synchronizes access to @sess_mask */
  63 };
  64
  65 /**
  66  * struct amdtee_context_data - AMD-TEE driver context data
  67  * @sess_list:    Keeps track of sessions opened in current TEE context
  68  * @shm_list:     Keeps track of buffers allocated and mapped in current TEE
  69  *                context
  70  */
  71 struct amdtee_context_data {
  72         struct list_head sess_list;
  73         struct list_head shm_list;
  74         struct mutex shm_mutex;   /* synchronizes access to @shm_list */
  75 };
  76
  77 struct amdtee_driver_data {
  78         struct amdtee *amdtee;
  79 };
  80
  81 struct shmem_desc {
  82         void *kaddr;
  83         u64 size;
  84 };
  85
  86 /**
  87  * struct amdtee_shm_data - Shared memory data
  88  * @kaddr:      Kernel virtual address of shared memory
  89  * @buf_id:     Buffer id of memory mapped by TEE_CMD_ID_MAP_SHARED_MEM
  90  */
  91 struct amdtee_shm_data {
  92         struct  list_head shm_node;
  93         void    *kaddr;
  94         u32     buf_id;
  95 };
  96
  97 /**
  98  * struct amdtee_ta_data - Keeps track of all TAs loaded in AMD Secure
  99  *                         Processor
 100  * @ta_handle:  Handle to TA loaded in TEE
 101  * @refcount:   Reference count for the loaded TA
 102  */
 103 struct amdtee_ta_data {
 104         struct list_head list_node;
 105         u32 ta_handle;
 106         u32 refcount;
 107 };
 108
 109 #define LOWER_TWO_BYTE_MASK     0x0000FFFF
 110
 111 /**
 112  * set_session_id() - Sets the session identifier.
 113  * @ta_handle:      [in] handle of the loaded Trusted Application (TA)
 114  * @session_index:  [in] Session index. Range: 0 to (TEE_NUM_SESSIONS - 1).
 115  * @session:        [out] Pointer to session id
 116  *
 117  * Lower two bytes of the session identifier represents the TA handle and the
 118  * upper two bytes is session index.
 119  */
 120 static inline void set_session_id(u32 ta_handle, u32 session_index,
 121                                   u32 *session)
 122 {
 123         *session = (session_index << 16) | (LOWER_TWO_BYTE_MASK & ta_handle);
 124 }
 125
 126 static inline u32 get_ta_handle(u32 session)
 127 {
 128         return session & LOWER_TWO_BYTE_MASK;
 129 }
 130
 131 static inline u32 get_session_index(u32 session)
 132 {
 133         return (session >> 16) & LOWER_TWO_BYTE_MASK;
 134 }
 135
 136 int amdtee_open_session(struct tee_context *ctx,
 137                         struct tee_ioctl_open_session_arg *arg,
 138                         struct tee_param *param);
 139
 140 int amdtee_close_session(struct tee_context *ctx, u32 session);
 141
 142 int amdtee_invoke_func(struct tee_context *ctx,
 143                        struct tee_ioctl_invoke_arg *arg,
 144                        struct tee_param *param);
 145
 146 int amdtee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session);
 147
 148 int amdtee_map_shmem(struct tee_shm *shm);
 149
 150 void amdtee_unmap_shmem(struct tee_shm *shm);
 151
 152 int handle_load_ta(void *data, u32 size,
 153                    struct tee_ioctl_open_session_arg *arg);
 154
 155 int handle_unload_ta(u32 ta_handle);
 156
 157 int handle_open_session(struct tee_ioctl_open_session_arg *arg, u32 *info,
 158                         struct tee_param *p);
 159
 160 int handle_close_session(u32 ta_handle, u32 info);
 161
 162 int handle_map_shmem(u32 count, struct shmem_desc *start, u32 *buf_id);
 163
 164 void handle_unmap_shmem(u32 buf_id);
 165
 166 int handle_invoke_cmd(struct tee_ioctl_invoke_arg *arg, u32 sinfo,
 167                       struct tee_param *p);
 168
 169 struct tee_shm_pool *amdtee_config_shm(void);
 170
 171 u32 get_buffer_id(struct tee_shm *shm);
 172 #endif /*AMDTEE_PRIVATE_H*/