drivers/tee/optee/optee_private.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (c) 2015, Linaro Limited
   4  */
   5
   6 #ifndef OPTEE_PRIVATE_H
   7 #define OPTEE_PRIVATE_H
   8
   9 #include <linux/arm-smccc.h>
  10 #include <linux/semaphore.h>
  11 #include <linux/tee_drv.h>
  12 #include <linux/types.h>
  13 #include "optee_msg.h"
  14
  15 #define OPTEE_MAX_ARG_SIZE      1024
  16
  17 /* Some Global Platform error codes used in this driver */
  18 #define TEEC_SUCCESS                    0x00000000
  19 #define TEEC_ERROR_BAD_PARAMETERS       0xFFFF0006
  20 #define TEEC_ERROR_NOT_SUPPORTED        0xFFFF000A
  21 #define TEEC_ERROR_COMMUNICATION        0xFFFF000E
  22 #define TEEC_ERROR_OUT_OF_MEMORY        0xFFFF000C
  23 #define TEEC_ERROR_SHORT_BUFFER         0xFFFF0010
  24
  25 #define TEEC_ORIGIN_COMMS               0x00000002
  26
  27 typedef void (optee_invoke_fn)(unsigned long, unsigned long, unsigned long,
  28                                 unsigned long, unsigned long, unsigned long,
  29                                 unsigned long, unsigned long,
  30                                 struct arm_smccc_res *);
  31
  32 struct optee_call_queue {
  33         /* Serializes access to this struct */
  34         struct mutex mutex;
  35         struct list_head waiters;
  36 };
  37
  38 struct optee_wait_queue {
  39         /* Serializes access to this struct */
  40         struct mutex mu;
  41         struct list_head db;
  42 };
  43
  44 /**
  45  * struct optee_supp - supplicant synchronization struct
  46  * @ctx                 the context of current connected supplicant.
  47  *                      if !NULL the supplicant device is available for use,
  48  *                      else busy
  49  * @mutex:              held while accessing content of this struct
  50  * @req_id:             current request id if supplicant is doing synchronous
  51  *                      communication, else -1
  52  * @reqs:               queued request not yet retrieved by supplicant
  53  * @idr:                IDR holding all requests currently being processed
  54  *                      by supplicant
  55  * @reqs_c:             completion used by supplicant when waiting for a
  56  *                      request to be queued.
  57  */
  58 struct optee_supp {
  59         /* Serializes access to this struct */
  60         struct mutex mutex;
  61         struct tee_context *ctx;
  62
  63         int req_id;
  64         struct list_head reqs;
  65         struct idr idr;
  66         struct completion reqs_c;
  67 };
  68
  69 /**
  70  * struct optee - main service struct
  71  * @supp_teedev:        supplicant device
  72  * @teedev:             client device
  73  * @invoke_fn:          function to issue smc or hvc
  74  * @call_queue:         queue of threads waiting to call @invoke_fn
  75  * @wait_queue:         queue of threads from secure world waiting for a
  76  *                      secure world sync object
  77  * @supp:               supplicant synchronization struct for RPC to supplicant
  78  * @pool:               shared memory pool
  79  * @memremaped_shm      virtual address of memory in shared memory pool
  80  * @sec_caps:           secure world capabilities defined by
  81  *                      OPTEE_SMC_SEC_CAP_* in optee_smc.h
  82  * @scan_bus_done       flag if device registation was already done.
  83  * @scan_bus_wq         workqueue to scan optee bus and register optee drivers
  84  * @scan_bus_work       workq to scan optee bus and register optee drivers
  85  */
  86 struct optee {
  87         struct tee_device *supp_teedev;
  88         struct tee_device *teedev;
  89         optee_invoke_fn *invoke_fn;
  90         struct optee_call_queue call_queue;
  91         struct optee_wait_queue wait_queue;
  92         struct optee_supp supp;
  93         struct tee_shm_pool *pool;
  94         void *memremaped_shm;
  95         u32 sec_caps;
  96         bool   scan_bus_done;
  97         struct workqueue_struct *scan_bus_wq;
  98         struct work_struct scan_bus_work;
  99 };
 100
 101 struct optee_session {
 102         struct list_head list_node;
 103         u32 session_id;
 104 };
 105
 106 struct optee_context_data {
 107         /* Serializes access to this struct */
 108         struct mutex mutex;
 109         struct list_head sess_list;
 110 };
 111
 112 struct optee_rpc_param {
 113         u32     a0;
 114         u32     a1;
 115         u32     a2;
 116         u32     a3;
 117         u32     a4;
 118         u32     a5;
 119         u32     a6;
 120         u32     a7;
 121 };
 122
 123 /* Holds context that is preserved during one STD call */
 124 struct optee_call_ctx {
 125         /* information about pages list used in last allocation */
 126         void *pages_list;
 127         size_t num_entries;
 128 };
 129
 130 void optee_handle_rpc(struct tee_context *ctx, struct optee_rpc_param *param,
 131                       struct optee_call_ctx *call_ctx);
 132 void optee_rpc_finalize_call(struct optee_call_ctx *call_ctx);
 133
 134 void optee_wait_queue_init(struct optee_wait_queue *wq);
 135 void optee_wait_queue_exit(struct optee_wait_queue *wq);
 136
 137 u32 optee_supp_thrd_req(struct tee_context *ctx, u32 func, size_t num_params,
 138                         struct tee_param *param);
 139
 140 int optee_supp_read(struct tee_context *ctx, void __user *buf, size_t len);
 141 int optee_supp_write(struct tee_context *ctx, void __user *buf, size_t len);
 142 void optee_supp_init(struct optee_supp *supp);
 143 void optee_supp_uninit(struct optee_supp *supp);
 144 void optee_supp_release(struct optee_supp *supp);
 145
 146 int optee_supp_recv(struct tee_context *ctx, u32 *func, u32 *num_params,
 147                     struct tee_param *param);
 148 int optee_supp_send(struct tee_context *ctx, u32 ret, u32 num_params,
 149                     struct tee_param *param);
 150
 151 u32 optee_do_call_with_arg(struct tee_context *ctx, phys_addr_t parg);
 152 int optee_open_session(struct tee_context *ctx,
 153                        struct tee_ioctl_open_session_arg *arg,
 154                        struct tee_param *param);
 155 int optee_close_session(struct tee_context *ctx, u32 session);
 156 int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,
 157                       struct tee_param *param);
 158 int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session);
 159
 160 void optee_enable_shm_cache(struct optee *optee);
 161 void optee_disable_shm_cache(struct optee *optee);
 162
 163 int optee_shm_register(struct tee_context *ctx, struct tee_shm *shm,
 164                        struct page **pages, size_t num_pages,
 165                        unsigned long start);
 166 int optee_shm_unregister(struct tee_context *ctx, struct tee_shm *shm);
 167
 168 int optee_shm_register_supp(struct tee_context *ctx, struct tee_shm *shm,
 169                             struct page **pages, size_t num_pages,
 170                             unsigned long start);
 171 int optee_shm_unregister_supp(struct tee_context *ctx, struct tee_shm *shm);
 172
 173 int optee_from_msg_param(struct tee_param *params, size_t num_params,
 174                          const struct optee_msg_param *msg_params);
 175 int optee_to_msg_param(struct optee_msg_param *msg_params, size_t num_params,
 176                        const struct tee_param *params);
 177
 178 u64 *optee_allocate_pages_list(size_t num_entries);
 179 void optee_free_pages_list(void *array, size_t num_entries);
 180 void optee_fill_pages_list(u64 *dst, struct page **pages, int num_pages,
 181                            size_t page_offset);
 182
 183 #define PTA_CMD_GET_DEVICES             0x0
 184 #define PTA_CMD_GET_DEVICES_SUPP        0x1
 185 int optee_enumerate_devices(u32 func);
 186
 187 /*
 188  * Small helpers
 189  */
 190
 191 static inline void *reg_pair_to_ptr(u32 reg0, u32 reg1)
 192 {
 193         return (void *)(unsigned long)(((u64)reg0 << 32) | reg1);
 194 }
 195
 196 static inline void reg_pair_from_64(u32 *reg0, u32 *reg1, u64 val)
 197 {
 198         *reg0 = val >> 32;
 199         *reg1 = val;
 200 }
 201
 202 #endif /*OPTEE_PRIVATE_H*/