1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (c) 2015-2021, 2023 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_core.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 /* 44 * struct optee_call_waiter - TEE entry may need to wait for a free TEE thread 45 * @list_node Reference in waiters list 46 * @c Waiting completion reference 47 * @sys_thread True if waiter belongs to a system thread 48 */ 49 struct optee_call_waiter { 50 struct list_head list_node; 51 struct completion c; 52 bool sys_thread; 53 }; 54 55 /* 56 * struct optee_call_queue - OP-TEE call queue management 57 * @mutex Serializes access to this struct 58 * @waiters List of threads waiting to enter OP-TEE 59 * @total_thread_count Overall number of thread context in OP-TEE or 0 60 * @free_thread_count Number of threads context free in OP-TEE 61 * @sys_thread_req_count Number of registered system thread sessions 62 */ 63 struct optee_call_queue { 64 /* Serializes access to this struct */ 65 struct mutex mutex; 66 struct list_head waiters; 67 int total_thread_count; 68 int free_thread_count; 69 int sys_thread_req_count; 70 }; 71 72 struct optee_notif { 73 u_int max_key; 74 /* Serializes access to the elements below in this struct */ 75 spinlock_t lock; 76 struct list_head db; 77 u_long *bitmap; 78 }; 79 80 #define OPTEE_SHM_ARG_ALLOC_PRIV BIT(0) 81 #define OPTEE_SHM_ARG_SHARED BIT(1) 82 struct optee_shm_arg_entry; 83 struct optee_shm_arg_cache { 84 u32 flags; 85 /* Serializes access to this struct */ 86 struct mutex mutex; 87 struct list_head shm_args; 88 }; 89 90 /** 91 * struct optee_supp - supplicant synchronization struct 92 * @ctx the context of current connected supplicant. 93 * if !NULL the supplicant device is available for use, 94 * else busy 95 * @mutex: held while accessing content of this struct 96 * @req_id: current request id if supplicant is doing synchronous 97 * communication, else -1 98 * @reqs: queued request not yet retrieved by supplicant 99 * @idr: IDR holding all requests currently being processed 100 * by supplicant 101 * @reqs_c: completion used by supplicant when waiting for a 102 * request to be queued. 103 */ 104 struct optee_supp { 105 /* Serializes access to this struct */ 106 struct mutex mutex; 107 struct tee_context *ctx; 108 109 int req_id; 110 struct list_head reqs; 111 struct idr idr; 112 struct completion reqs_c; 113 }; 114 115 /* 116 * struct optee_pcpu - per cpu notif private struct passed to work functions 117 * @optee optee device reference 118 */ 119 struct optee_pcpu { 120 struct optee *optee; 121 }; 122 123 /* 124 * struct optee_smc - optee smc communication struct 125 * @invoke_fn handler function to invoke secure monitor 126 * @memremaped_shm virtual address of memory in shared memory pool 127 * @sec_caps: secure world capabilities defined by 128 * OPTEE_SMC_SEC_CAP_* in optee_smc.h 129 * @notif_irq interrupt used as async notification by OP-TEE or 0 130 * @optee_pcpu per_cpu optee instance for per cpu work or NULL 131 * @notif_pcpu_wq workqueue for per cpu asynchronous notification or NULL 132 * @notif_pcpu_work work for per cpu asynchronous notification 133 * @notif_cpuhp_state CPU hotplug state assigned for pcpu interrupt management 134 */ 135 struct optee_smc { 136 optee_invoke_fn *invoke_fn; 137 void *memremaped_shm; 138 u32 sec_caps; 139 unsigned int notif_irq; 140 struct optee_pcpu __percpu *optee_pcpu; 141 struct workqueue_struct *notif_pcpu_wq; 142 struct work_struct notif_pcpu_work; 143 unsigned int notif_cpuhp_state; 144 }; 145 146 /** 147 * struct optee_ffa_data - FFA communication struct 148 * @ffa_dev FFA device, contains the destination id, the id of 149 * OP-TEE in secure world 150 * @bottom_half_value Notification ID used for bottom half signalling or 151 * U32_MAX if unused 152 * @mutex Serializes access to @global_ids 153 * @global_ids FF-A shared memory global handle translation 154 */ 155 struct optee_ffa { 156 struct ffa_device *ffa_dev; 157 u32 bottom_half_value; 158 /* Serializes access to @global_ids */ 159 struct mutex mutex; 160 struct rhashtable global_ids; 161 }; 162 163 struct optee; 164 165 /** 166 * struct optee_ops - OP-TEE driver internal operations 167 * @do_call_with_arg: enters OP-TEE in secure world 168 * @to_msg_param: converts from struct tee_param to OPTEE_MSG parameters 169 * @from_msg_param: converts from OPTEE_MSG parameters to struct tee_param 170 * 171 * These OPs are only supposed to be used internally in the OP-TEE driver 172 * as a way of abstracting the different methogs of entering OP-TEE in 173 * secure world. 174 */ 175 struct optee_ops { 176 int (*do_call_with_arg)(struct tee_context *ctx, 177 struct tee_shm *shm_arg, u_int offs, 178 bool system_thread); 179 int (*to_msg_param)(struct optee *optee, 180 struct optee_msg_param *msg_params, 181 size_t num_params, const struct tee_param *params); 182 int (*from_msg_param)(struct optee *optee, struct tee_param *params, 183 size_t num_params, 184 const struct optee_msg_param *msg_params); 185 }; 186 187 /** 188 * struct optee - main service struct 189 * @supp_teedev: supplicant device 190 * @teedev: client device 191 * @ops: internal callbacks for different ways to reach secure 192 * world 193 * @ctx: driver internal TEE context 194 * @smc: specific to SMC ABI 195 * @ffa: specific to FF-A ABI 196 * @call_queue: queue of threads waiting to call @invoke_fn 197 * @notif: notification synchronization struct 198 * @supp: supplicant synchronization struct for RPC to supplicant 199 * @pool: shared memory pool 200 * @rpc_param_count: If > 0 number of RPC parameters to make room for 201 * @scan_bus_done flag if device registation was already done. 202 * @scan_bus_work workq to scan optee bus and register optee drivers 203 */ 204 struct optee { 205 struct tee_device *supp_teedev; 206 struct tee_device *teedev; 207 const struct optee_ops *ops; 208 struct tee_context *ctx; 209 union { 210 struct optee_smc smc; 211 struct optee_ffa ffa; 212 }; 213 struct optee_shm_arg_cache shm_arg_cache; 214 struct optee_call_queue call_queue; 215 struct optee_notif notif; 216 struct optee_supp supp; 217 struct tee_shm_pool *pool; 218 unsigned int rpc_param_count; 219 bool scan_bus_done; 220 struct work_struct scan_bus_work; 221 }; 222 223 struct optee_session { 224 struct list_head list_node; 225 u32 session_id; 226 bool use_sys_thread; 227 }; 228 229 struct optee_context_data { 230 /* Serializes access to this struct */ 231 struct mutex mutex; 232 struct list_head sess_list; 233 }; 234 235 struct optee_rpc_param { 236 u32 a0; 237 u32 a1; 238 u32 a2; 239 u32 a3; 240 u32 a4; 241 u32 a5; 242 u32 a6; 243 u32 a7; 244 }; 245 246 /* Holds context that is preserved during one STD call */ 247 struct optee_call_ctx { 248 /* information about pages list used in last allocation */ 249 void *pages_list; 250 size_t num_entries; 251 }; 252 253 int optee_notif_init(struct optee *optee, u_int max_key); 254 void optee_notif_uninit(struct optee *optee); 255 int optee_notif_wait(struct optee *optee, u_int key); 256 int optee_notif_send(struct optee *optee, u_int key); 257 258 u32 optee_supp_thrd_req(struct tee_context *ctx, u32 func, size_t num_params, 259 struct tee_param *param); 260 261 void optee_supp_init(struct optee_supp *supp); 262 void optee_supp_uninit(struct optee_supp *supp); 263 void optee_supp_release(struct optee_supp *supp); 264 265 int optee_supp_recv(struct tee_context *ctx, u32 *func, u32 *num_params, 266 struct tee_param *param); 267 int optee_supp_send(struct tee_context *ctx, u32 ret, u32 num_params, 268 struct tee_param *param); 269 270 int optee_open_session(struct tee_context *ctx, 271 struct tee_ioctl_open_session_arg *arg, 272 struct tee_param *param); 273 int optee_system_session(struct tee_context *ctx, u32 session); 274 int optee_close_session_helper(struct tee_context *ctx, u32 session, 275 bool system_thread); 276 int optee_close_session(struct tee_context *ctx, u32 session); 277 int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg, 278 struct tee_param *param); 279 int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session); 280 281 #define PTA_CMD_GET_DEVICES 0x0 282 #define PTA_CMD_GET_DEVICES_SUPP 0x1 283 int optee_enumerate_devices(u32 func); 284 void optee_unregister_devices(void); 285 286 void optee_remove_common(struct optee *optee); 287 int optee_open(struct tee_context *ctx, bool cap_memref_null); 288 void optee_release(struct tee_context *ctx); 289 void optee_release_supp(struct tee_context *ctx); 290 291 static inline void optee_from_msg_param_value(struct tee_param *p, u32 attr, 292 const struct optee_msg_param *mp) 293 { 294 p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT + 295 attr - OPTEE_MSG_ATTR_TYPE_VALUE_INPUT; 296 p->u.value.a = mp->u.value.a; 297 p->u.value.b = mp->u.value.b; 298 p->u.value.c = mp->u.value.c; 299 } 300 301 static inline void optee_to_msg_param_value(struct optee_msg_param *mp, 302 const struct tee_param *p) 303 { 304 mp->attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT + p->attr - 305 TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT; 306 mp->u.value.a = p->u.value.a; 307 mp->u.value.b = p->u.value.b; 308 mp->u.value.c = p->u.value.c; 309 } 310 311 void optee_cq_init(struct optee_call_queue *cq, int thread_count); 312 void optee_cq_wait_init(struct optee_call_queue *cq, 313 struct optee_call_waiter *w, bool sys_thread); 314 void optee_cq_wait_for_completion(struct optee_call_queue *cq, 315 struct optee_call_waiter *w); 316 void optee_cq_wait_final(struct optee_call_queue *cq, 317 struct optee_call_waiter *w); 318 int optee_check_mem_type(unsigned long start, size_t num_pages); 319 320 void optee_shm_arg_cache_init(struct optee *optee, u32 flags); 321 void optee_shm_arg_cache_uninit(struct optee *optee); 322 struct optee_msg_arg *optee_get_msg_arg(struct tee_context *ctx, 323 size_t num_params, 324 struct optee_shm_arg_entry **entry, 325 struct tee_shm **shm_ret, 326 u_int *offs); 327 void optee_free_msg_arg(struct tee_context *ctx, 328 struct optee_shm_arg_entry *entry, u_int offs); 329 size_t optee_msg_arg_size(size_t rpc_param_count); 330 331 332 struct tee_shm *optee_rpc_cmd_alloc_suppl(struct tee_context *ctx, size_t sz); 333 void optee_rpc_cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm); 334 void optee_rpc_cmd(struct tee_context *ctx, struct optee *optee, 335 struct optee_msg_arg *arg); 336 337 int optee_do_bottom_half(struct tee_context *ctx); 338 int optee_stop_async_notif(struct tee_context *ctx); 339 340 /* 341 * Small helpers 342 */ 343 344 static inline void *reg_pair_to_ptr(u32 reg0, u32 reg1) 345 { 346 return (void *)(unsigned long)(((u64)reg0 << 32) | reg1); 347 } 348 349 static inline void reg_pair_from_64(u32 *reg0, u32 *reg1, u64 val) 350 { 351 *reg0 = val >> 32; 352 *reg1 = val; 353 } 354 355 /* Registration of the ABIs */ 356 int optee_smc_abi_register(void); 357 void optee_smc_abi_unregister(void); 358 int optee_ffa_abi_register(void); 359 void optee_ffa_abi_unregister(void); 360 361 #endif /*OPTEE_PRIVATE_H*/ 362