1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (c) 2015-2021, Linaro Limited 4 */ 5 6 #ifndef OPTEE_PRIVATE_H 7 #define OPTEE_PRIVATE_H 8 9 #include <linux/arm-smccc.h> 10 #include <linux/rhashtable.h> 11 #include <linux/semaphore.h> 12 #include <linux/tee_drv.h> 13 #include <linux/types.h> 14 #include "optee_msg.h" 15 16 #define DRIVER_NAME "optee" 17 18 #define OPTEE_MAX_ARG_SIZE 1024 19 20 /* Some Global Platform error codes used in this driver */ 21 #define TEEC_SUCCESS 0x00000000 22 #define TEEC_ERROR_BAD_PARAMETERS 0xFFFF0006 23 #define TEEC_ERROR_NOT_SUPPORTED 0xFFFF000A 24 #define TEEC_ERROR_COMMUNICATION 0xFFFF000E 25 #define TEEC_ERROR_OUT_OF_MEMORY 0xFFFF000C 26 #define TEEC_ERROR_BUSY 0xFFFF000D 27 #define TEEC_ERROR_SHORT_BUFFER 0xFFFF0010 28 29 #define TEEC_ORIGIN_COMMS 0x00000002 30 31 /* 32 * This value should be larger than the number threads in secure world to 33 * meet the need from secure world. The number of threads in secure world 34 * are usually not even close to 255 so we should be safe for now. 35 */ 36 #define OPTEE_DEFAULT_MAX_NOTIF_VALUE 255 37 38 typedef void (optee_invoke_fn)(unsigned long, unsigned long, unsigned long, 39 unsigned long, unsigned long, unsigned long, 40 unsigned long, unsigned long, 41 struct arm_smccc_res *); 42 43 struct optee_call_waiter { 44 struct list_head list_node; 45 struct completion c; 46 }; 47 48 struct optee_call_queue { 49 /* Serializes access to this struct */ 50 struct mutex mutex; 51 struct list_head waiters; 52 }; 53 54 struct optee_notif { 55 u_int max_key; 56 /* Serializes access to the elements below in this struct */ 57 spinlock_t lock; 58 struct list_head db; 59 u_long *bitmap; 60 }; 61 62 #define OPTEE_SHM_ARG_ALLOC_PRIV BIT(0) 63 #define OPTEE_SHM_ARG_SHARED BIT(1) 64 struct optee_shm_arg_entry; 65 struct optee_shm_arg_cache { 66 u32 flags; 67 /* Serializes access to this struct */ 68 struct mutex mutex; 69 struct list_head shm_args; 70 }; 71 72 /** 73 * struct optee_supp - supplicant synchronization struct 74 * @ctx the context of current connected supplicant. 75 * if !NULL the supplicant device is available for use, 76 * else busy 77 * @mutex: held while accessing content of this struct 78 * @req_id: current request id if supplicant is doing synchronous 79 * communication, else -1 80 * @reqs: queued request not yet retrieved by supplicant 81 * @idr: IDR holding all requests currently being processed 82 * by supplicant 83 * @reqs_c: completion used by supplicant when waiting for a 84 * request to be queued. 85 */ 86 struct optee_supp { 87 /* Serializes access to this struct */ 88 struct mutex mutex; 89 struct tee_context *ctx; 90 91 int req_id; 92 struct list_head reqs; 93 struct idr idr; 94 struct completion reqs_c; 95 }; 96 97 struct optee_smc { 98 optee_invoke_fn *invoke_fn; 99 void *memremaped_shm; 100 u32 sec_caps; 101 unsigned int notif_irq; 102 }; 103 104 /** 105 * struct optee_ffa_data - FFA communication struct 106 * @ffa_dev FFA device, contains the destination id, the id of 107 * OP-TEE in secure world 108 * @ffa_ops FFA operations 109 * @mutex Serializes access to @global_ids 110 * @global_ids FF-A shared memory global handle translation 111 */ 112 struct optee_ffa { 113 struct ffa_device *ffa_dev; 114 /* Serializes access to @global_ids */ 115 struct mutex mutex; 116 struct rhashtable global_ids; 117 }; 118 119 struct optee; 120 121 /** 122 * struct optee_ops - OP-TEE driver internal operations 123 * @do_call_with_arg: enters OP-TEE in secure world 124 * @to_msg_param: converts from struct tee_param to OPTEE_MSG parameters 125 * @from_msg_param: converts from OPTEE_MSG parameters to struct tee_param 126 * 127 * These OPs are only supposed to be used internally in the OP-TEE driver 128 * as a way of abstracting the different methogs of entering OP-TEE in 129 * secure world. 130 */ 131 struct optee_ops { 132 int (*do_call_with_arg)(struct tee_context *ctx, 133 struct tee_shm *shm_arg, u_int offs); 134 int (*to_msg_param)(struct optee *optee, 135 struct optee_msg_param *msg_params, 136 size_t num_params, const struct tee_param *params); 137 int (*from_msg_param)(struct optee *optee, struct tee_param *params, 138 size_t num_params, 139 const struct optee_msg_param *msg_params); 140 }; 141 142 /** 143 * struct optee - main service struct 144 * @supp_teedev: supplicant device 145 * @teedev: client device 146 * @ops: internal callbacks for different ways to reach secure 147 * world 148 * @ctx: driver internal TEE context 149 * @smc: specific to SMC ABI 150 * @ffa: specific to FF-A ABI 151 * @call_queue: queue of threads waiting to call @invoke_fn 152 * @notif: notification synchronization struct 153 * @supp: supplicant synchronization struct for RPC to supplicant 154 * @pool: shared memory pool 155 * @rpc_param_count: If > 0 number of RPC parameters to make room for 156 * @scan_bus_done flag if device registation was already done. 157 * @scan_bus_wq workqueue to scan optee bus and register optee drivers 158 * @scan_bus_work workq to scan optee bus and register optee drivers 159 */ 160 struct optee { 161 struct tee_device *supp_teedev; 162 struct tee_device *teedev; 163 const struct optee_ops *ops; 164 struct tee_context *ctx; 165 union { 166 struct optee_smc smc; 167 struct optee_ffa ffa; 168 }; 169 struct optee_shm_arg_cache shm_arg_cache; 170 struct optee_call_queue call_queue; 171 struct optee_notif notif; 172 struct optee_supp supp; 173 struct tee_shm_pool *pool; 174 unsigned int rpc_param_count; 175 bool scan_bus_done; 176 struct workqueue_struct *scan_bus_wq; 177 struct work_struct scan_bus_work; 178 }; 179 180 struct optee_session { 181 struct list_head list_node; 182 u32 session_id; 183 }; 184 185 struct optee_context_data { 186 /* Serializes access to this struct */ 187 struct mutex mutex; 188 struct list_head sess_list; 189 }; 190 191 struct optee_rpc_param { 192 u32 a0; 193 u32 a1; 194 u32 a2; 195 u32 a3; 196 u32 a4; 197 u32 a5; 198 u32 a6; 199 u32 a7; 200 }; 201 202 /* Holds context that is preserved during one STD call */ 203 struct optee_call_ctx { 204 /* information about pages list used in last allocation */ 205 void *pages_list; 206 size_t num_entries; 207 }; 208 209 int optee_notif_init(struct optee *optee, u_int max_key); 210 void optee_notif_uninit(struct optee *optee); 211 int optee_notif_wait(struct optee *optee, u_int key); 212 int optee_notif_send(struct optee *optee, u_int key); 213 214 u32 optee_supp_thrd_req(struct tee_context *ctx, u32 func, size_t num_params, 215 struct tee_param *param); 216 217 int optee_supp_read(struct tee_context *ctx, void __user *buf, size_t len); 218 int optee_supp_write(struct tee_context *ctx, void __user *buf, size_t len); 219 void optee_supp_init(struct optee_supp *supp); 220 void optee_supp_uninit(struct optee_supp *supp); 221 void optee_supp_release(struct optee_supp *supp); 222 223 int optee_supp_recv(struct tee_context *ctx, u32 *func, u32 *num_params, 224 struct tee_param *param); 225 int optee_supp_send(struct tee_context *ctx, u32 ret, u32 num_params, 226 struct tee_param *param); 227 228 int optee_open_session(struct tee_context *ctx, 229 struct tee_ioctl_open_session_arg *arg, 230 struct tee_param *param); 231 int optee_close_session_helper(struct tee_context *ctx, u32 session); 232 int optee_close_session(struct tee_context *ctx, u32 session); 233 int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg, 234 struct tee_param *param); 235 int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session); 236 237 #define PTA_CMD_GET_DEVICES 0x0 238 #define PTA_CMD_GET_DEVICES_SUPP 0x1 239 int optee_enumerate_devices(u32 func); 240 void optee_unregister_devices(void); 241 242 int optee_pool_op_alloc_helper(struct tee_shm_pool *pool, struct tee_shm *shm, 243 size_t size, size_t align, 244 int (*shm_register)(struct tee_context *ctx, 245 struct tee_shm *shm, 246 struct page **pages, 247 size_t num_pages, 248 unsigned long start)); 249 void optee_pool_op_free_helper(struct tee_shm_pool *pool, struct tee_shm *shm, 250 int (*shm_unregister)(struct tee_context *ctx, 251 struct tee_shm *shm)); 252 253 254 void optee_remove_common(struct optee *optee); 255 int optee_open(struct tee_context *ctx, bool cap_memref_null); 256 void optee_release(struct tee_context *ctx); 257 void optee_release_supp(struct tee_context *ctx); 258 259 static inline void optee_from_msg_param_value(struct tee_param *p, u32 attr, 260 const struct optee_msg_param *mp) 261 { 262 p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT + 263 attr - OPTEE_MSG_ATTR_TYPE_VALUE_INPUT; 264 p->u.value.a = mp->u.value.a; 265 p->u.value.b = mp->u.value.b; 266 p->u.value.c = mp->u.value.c; 267 } 268 269 static inline void optee_to_msg_param_value(struct optee_msg_param *mp, 270 const struct tee_param *p) 271 { 272 mp->attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT + p->attr - 273 TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT; 274 mp->u.value.a = p->u.value.a; 275 mp->u.value.b = p->u.value.b; 276 mp->u.value.c = p->u.value.c; 277 } 278 279 void optee_cq_wait_init(struct optee_call_queue *cq, 280 struct optee_call_waiter *w); 281 void optee_cq_wait_for_completion(struct optee_call_queue *cq, 282 struct optee_call_waiter *w); 283 void optee_cq_wait_final(struct optee_call_queue *cq, 284 struct optee_call_waiter *w); 285 int optee_check_mem_type(unsigned long start, size_t num_pages); 286 287 void optee_shm_arg_cache_init(struct optee *optee, u32 flags); 288 void optee_shm_arg_cache_uninit(struct optee *optee); 289 struct optee_msg_arg *optee_get_msg_arg(struct tee_context *ctx, 290 size_t num_params, 291 struct optee_shm_arg_entry **entry, 292 struct tee_shm **shm_ret, 293 u_int *offs); 294 void optee_free_msg_arg(struct tee_context *ctx, 295 struct optee_shm_arg_entry *entry, u_int offs); 296 size_t optee_msg_arg_size(size_t rpc_param_count); 297 298 299 struct tee_shm *optee_rpc_cmd_alloc_suppl(struct tee_context *ctx, size_t sz); 300 void optee_rpc_cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm); 301 void optee_rpc_cmd(struct tee_context *ctx, struct optee *optee, 302 struct optee_msg_arg *arg); 303 304 /* 305 * Small helpers 306 */ 307 308 static inline void *reg_pair_to_ptr(u32 reg0, u32 reg1) 309 { 310 return (void *)(unsigned long)(((u64)reg0 << 32) | reg1); 311 } 312 313 static inline void reg_pair_from_64(u32 *reg0, u32 *reg1, u64 val) 314 { 315 *reg0 = val >> 32; 316 *reg1 = val; 317 } 318 319 /* Registration of the ABIs */ 320 int optee_smc_abi_register(void); 321 void optee_smc_abi_unregister(void); 322 int optee_ffa_abi_register(void); 323 void optee_ffa_abi_unregister(void); 324 325 #endif /*OPTEE_PRIVATE_H*/ 326