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/notifier.h>
11 #include <linux/rhashtable.h>
12 #include <linux/rpmb.h>
13 #include <linux/semaphore.h>
14 #include <linux/tee_core.h>
15 #include <linux/types.h>
16 #include "optee_msg.h"
17
18 #define DRIVER_NAME "optee"
19
20 #define OPTEE_MAX_ARG_SIZE 1024
21
22 /* Some Global Platform error codes used in this driver */
23 #define TEEC_SUCCESS 0x00000000
24 #define TEEC_ERROR_BAD_PARAMETERS 0xFFFF0006
25 #define TEEC_ERROR_ITEM_NOT_FOUND 0xFFFF0008
26 #define TEEC_ERROR_NOT_SUPPORTED 0xFFFF000A
27 #define TEEC_ERROR_COMMUNICATION 0xFFFF000E
28 #define TEEC_ERROR_OUT_OF_MEMORY 0xFFFF000C
29 #define TEEC_ERROR_BUSY 0xFFFF000D
30 #define TEEC_ERROR_SHORT_BUFFER 0xFFFF0010
31
32 /* API Return Codes are from the GP TEE Internal Core API Specification */
33 #define TEE_ERROR_TIMEOUT 0xFFFF3001
34 #define TEE_ERROR_STORAGE_NOT_AVAILABLE 0xF0100003
35
36 #define TEEC_ORIGIN_COMMS 0x00000002
37
38 /*
39 * This value should be larger than the number threads in secure world to
40 * meet the need from secure world. The number of threads in secure world
41 * are usually not even close to 255 so we should be safe for now.
42 */
43 #define OPTEE_DEFAULT_MAX_NOTIF_VALUE 255
44
45 typedef void (optee_invoke_fn)(unsigned long, unsigned long, unsigned long,
46 unsigned long, unsigned long, unsigned long,
47 unsigned long, unsigned long,
48 struct arm_smccc_res *);
49
50 /*
51 * struct optee_call_waiter - TEE entry may need to wait for a free TEE thread
52 * @list_node Reference in waiters list
53 * @c Waiting completion reference
54 * @sys_thread True if waiter belongs to a system thread
55 */
56 struct optee_call_waiter {
57 struct list_head list_node;
58 struct completion c;
59 bool sys_thread;
60 };
61
62 /*
63 * struct optee_call_queue - OP-TEE call queue management
64 * @mutex Serializes access to this struct
65 * @waiters List of threads waiting to enter OP-TEE
66 * @total_thread_count Overall number of thread context in OP-TEE or 0
67 * @free_thread_count Number of threads context free in OP-TEE
68 * @sys_thread_req_count Number of registered system thread sessions
69 */
70 struct optee_call_queue {
71 /* Serializes access to this struct */
72 struct mutex mutex;
73 struct list_head waiters;
74 int total_thread_count;
75 int free_thread_count;
76 int sys_thread_req_count;
77 };
78
79 struct optee_notif {
80 u_int max_key;
81 /* Serializes access to the elements below in this struct */
82 spinlock_t lock;
83 struct list_head db;
84 u_long *bitmap;
85 };
86
87 #define OPTEE_SHM_ARG_ALLOC_PRIV BIT(0)
88 #define OPTEE_SHM_ARG_SHARED BIT(1)
89 struct optee_shm_arg_entry;
90 struct optee_shm_arg_cache {
91 u32 flags;
92 /* Serializes access to this struct */
93 struct mutex mutex;
94 struct list_head shm_args;
95 };
96
97 /**
98 * struct optee_supp - supplicant synchronization struct
99 * @ctx the context of current connected supplicant.
100 * if !NULL the supplicant device is available for use,
101 * else busy
102 * @mutex: held while accessing content of this struct
103 * @req_id: current request id if supplicant is doing synchronous
104 * communication, else -1
105 * @reqs: queued request not yet retrieved by supplicant
106 * @idr: IDR holding all requests currently being processed
107 * by supplicant
108 * @reqs_c: completion used by supplicant when waiting for a
109 * request to be queued.
110 */
111 struct optee_supp {
112 /* Serializes access to this struct */
113 struct mutex mutex;
114 struct tee_context *ctx;
115
116 int req_id;
117 struct list_head reqs;
118 struct idr idr;
119 struct completion reqs_c;
120 };
121
122 /*
123 * struct optee_pcpu - per cpu notif private struct passed to work functions
124 * @optee optee device reference
125 */
126 struct optee_pcpu {
127 struct optee *optee;
128 };
129
130 /*
131 * struct optee_smc - optee smc communication struct
132 * @invoke_fn handler function to invoke secure monitor
133 * @memremaped_shm virtual address of memory in shared memory pool
134 * @sec_caps: secure world capabilities defined by
135 * OPTEE_SMC_SEC_CAP_* in optee_smc.h
136 * @notif_irq interrupt used as async notification by OP-TEE or 0
137 * @optee_pcpu per_cpu optee instance for per cpu work or NULL
138 * @notif_pcpu_wq workqueue for per cpu asynchronous notification or NULL
139 * @notif_pcpu_work work for per cpu asynchronous notification
140 * @notif_cpuhp_state CPU hotplug state assigned for pcpu interrupt management
141 */
142 struct optee_smc {
143 optee_invoke_fn *invoke_fn;
144 void *memremaped_shm;
145 u32 sec_caps;
146 unsigned int notif_irq;
147 struct optee_pcpu __percpu *optee_pcpu;
148 struct workqueue_struct *notif_pcpu_wq;
149 struct work_struct notif_pcpu_work;
150 unsigned int notif_cpuhp_state;
151 };
152
153 /**
154 * struct optee_ffa_data - FFA communication struct
155 * @ffa_dev FFA device, contains the destination id, the id of
156 * OP-TEE in secure world
157 * @bottom_half_value Notification ID used for bottom half signalling or
158 * U32_MAX if unused
159 * @mutex Serializes access to @global_ids
160 * @global_ids FF-A shared memory global handle translation
161 */
162 struct optee_ffa {
163 struct ffa_device *ffa_dev;
164 u32 bottom_half_value;
165 /* Serializes access to @global_ids */
166 struct mutex mutex;
167 struct rhashtable global_ids;
168 struct workqueue_struct *notif_wq;
169 struct work_struct notif_work;
170 };
171
172 struct optee;
173
174 /**
175 * struct optee_ops - OP-TEE driver internal operations
176 * @do_call_with_arg: enters OP-TEE in secure world
177 * @to_msg_param: converts from struct tee_param to OPTEE_MSG parameters
178 * @from_msg_param: converts from OPTEE_MSG parameters to struct tee_param
179 *
180 * These OPs are only supposed to be used internally in the OP-TEE driver
181 * as a way of abstracting the different methogs of entering OP-TEE in
182 * secure world.
183 */
184 struct optee_ops {
185 int (*do_call_with_arg)(struct tee_context *ctx,
186 struct tee_shm *shm_arg, u_int offs,
187 bool system_thread);
188 int (*to_msg_param)(struct optee *optee,
189 struct optee_msg_param *msg_params,
190 size_t num_params, const struct tee_param *params);
191 int (*from_msg_param)(struct optee *optee, struct tee_param *params,
192 size_t num_params,
193 const struct optee_msg_param *msg_params);
194 };
195
196 /**
197 * struct optee - main service struct
198 * @supp_teedev: supplicant device
199 * @teedev: client device
200 * @ops: internal callbacks for different ways to reach secure
201 * world
202 * @ctx: driver internal TEE context
203 * @smc: specific to SMC ABI
204 * @ffa: specific to FF-A ABI
205 * @call_queue: queue of threads waiting to call @invoke_fn
206 * @notif: notification synchronization struct
207 * @supp: supplicant synchronization struct for RPC to supplicant
208 * @pool: shared memory pool
209 * @mutex: mutex protecting @rpmb_dev
210 * @rpmb_dev: current RPMB device or NULL
211 * @rpmb_scan_bus_done flag if device registation of RPMB dependent devices
212 * was already done
213 * @rpmb_scan_bus_work workq to for an RPMB device and to scan optee bus
214 * and register RPMB dependent optee drivers
215 * @rpc_param_count: If > 0 number of RPC parameters to make room for
216 * @scan_bus_done flag if device registation was already done.
217 * @scan_bus_work workq to scan optee bus and register optee drivers
218 */
219 struct optee {
220 struct tee_device *supp_teedev;
221 struct tee_device *teedev;
222 const struct optee_ops *ops;
223 struct tee_context *ctx;
224 union {
225 struct optee_smc smc;
226 struct optee_ffa ffa;
227 };
228 struct optee_shm_arg_cache shm_arg_cache;
229 struct optee_call_queue call_queue;
230 struct optee_notif notif;
231 struct optee_supp supp;
232 struct tee_shm_pool *pool;
233 /* Protects rpmb_dev pointer */
234 struct mutex rpmb_dev_mutex;
235 struct rpmb_dev *rpmb_dev;
236 struct notifier_block rpmb_intf;
237 unsigned int rpc_param_count;
238 bool scan_bus_done;
239 bool rpmb_scan_bus_done;
240 bool in_kernel_rpmb_routing;
241 struct work_struct scan_bus_work;
242 struct work_struct rpmb_scan_bus_work;
243 };
244
245 struct optee_session {
246 struct list_head list_node;
247 u32 session_id;
248 bool use_sys_thread;
249 };
250
251 struct optee_context_data {
252 /* Serializes access to this struct */
253 struct mutex mutex;
254 struct list_head sess_list;
255 };
256
257 struct optee_rpc_param {
258 u32 a0;
259 u32 a1;
260 u32 a2;
261 u32 a3;
262 u32 a4;
263 u32 a5;
264 u32 a6;
265 u32 a7;
266 };
267
268 /* Holds context that is preserved during one STD call */
269 struct optee_call_ctx {
270 /* information about pages list used in last allocation */
271 void *pages_list;
272 size_t num_entries;
273 };
274
275 extern struct blocking_notifier_head optee_rpmb_intf_added;
276
277 int optee_notif_init(struct optee *optee, u_int max_key);
278 void optee_notif_uninit(struct optee *optee);
279 int optee_notif_wait(struct optee *optee, u_int key, u32 timeout);
280 int optee_notif_send(struct optee *optee, u_int key);
281
282 u32 optee_supp_thrd_req(struct tee_context *ctx, u32 func, size_t num_params,
283 struct tee_param *param);
284
285 void optee_supp_init(struct optee_supp *supp);
286 void optee_supp_uninit(struct optee_supp *supp);
287 void optee_supp_release(struct optee_supp *supp);
288
289 int optee_supp_recv(struct tee_context *ctx, u32 *func, u32 *num_params,
290 struct tee_param *param);
291 int optee_supp_send(struct tee_context *ctx, u32 ret, u32 num_params,
292 struct tee_param *param);
293
294 int optee_open_session(struct tee_context *ctx,
295 struct tee_ioctl_open_session_arg *arg,
296 struct tee_param *param);
297 int optee_system_session(struct tee_context *ctx, u32 session);
298 int optee_close_session_helper(struct tee_context *ctx, u32 session,
299 bool system_thread);
300 int optee_close_session(struct tee_context *ctx, u32 session);
301 int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,
302 struct tee_param *param);
303 int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session);
304
305 #define PTA_CMD_GET_DEVICES 0x0
306 #define PTA_CMD_GET_DEVICES_SUPP 0x1
307 #define PTA_CMD_GET_DEVICES_RPMB 0x2
308 int optee_enumerate_devices(u32 func);
309 void optee_unregister_devices(void);
310 void optee_bus_scan_rpmb(struct work_struct *work);
311 int optee_rpmb_intf_rdev(struct notifier_block *intf, unsigned long action,
312 void *data);
313
314 void optee_set_dev_group(struct optee *optee);
315 void optee_remove_common(struct optee *optee);
316 int optee_open(struct tee_context *ctx, bool cap_memref_null);
317 void optee_release(struct tee_context *ctx);
318 void optee_release_supp(struct tee_context *ctx);
319
optee_from_msg_param_value(struct tee_param * p,u32 attr,const struct optee_msg_param * mp)320 static inline void optee_from_msg_param_value(struct tee_param *p, u32 attr,
321 const struct optee_msg_param *mp)
322 {
323 p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT +
324 attr - OPTEE_MSG_ATTR_TYPE_VALUE_INPUT;
325 p->u.value.a = mp->u.value.a;
326 p->u.value.b = mp->u.value.b;
327 p->u.value.c = mp->u.value.c;
328 }
329
optee_to_msg_param_value(struct optee_msg_param * mp,const struct tee_param * p)330 static inline void optee_to_msg_param_value(struct optee_msg_param *mp,
331 const struct tee_param *p)
332 {
333 mp->attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT + p->attr -
334 TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;
335 mp->u.value.a = p->u.value.a;
336 mp->u.value.b = p->u.value.b;
337 mp->u.value.c = p->u.value.c;
338 }
339
340 void optee_cq_init(struct optee_call_queue *cq, int thread_count);
341 void optee_cq_wait_init(struct optee_call_queue *cq,
342 struct optee_call_waiter *w, bool sys_thread);
343 void optee_cq_wait_for_completion(struct optee_call_queue *cq,
344 struct optee_call_waiter *w);
345 void optee_cq_wait_final(struct optee_call_queue *cq,
346 struct optee_call_waiter *w);
347 int optee_check_mem_type(unsigned long start, size_t num_pages);
348
349 void optee_shm_arg_cache_init(struct optee *optee, u32 flags);
350 void optee_shm_arg_cache_uninit(struct optee *optee);
351 struct optee_msg_arg *optee_get_msg_arg(struct tee_context *ctx,
352 size_t num_params,
353 struct optee_shm_arg_entry **entry,
354 struct tee_shm **shm_ret,
355 u_int *offs);
356 void optee_free_msg_arg(struct tee_context *ctx,
357 struct optee_shm_arg_entry *entry, u_int offs);
358 size_t optee_msg_arg_size(size_t rpc_param_count);
359
360
361 struct tee_shm *optee_rpc_cmd_alloc_suppl(struct tee_context *ctx, size_t sz);
362 void optee_rpc_cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm);
363 void optee_rpc_cmd(struct tee_context *ctx, struct optee *optee,
364 struct optee_msg_arg *arg);
365
366 int optee_do_bottom_half(struct tee_context *ctx);
367 int optee_stop_async_notif(struct tee_context *ctx);
368
369 /*
370 * Small helpers
371 */
372
reg_pair_to_ptr(u32 reg0,u32 reg1)373 static inline void *reg_pair_to_ptr(u32 reg0, u32 reg1)
374 {
375 return (void *)(unsigned long)(((u64)reg0 << 32) | reg1);
376 }
377
reg_pair_from_64(u32 * reg0,u32 * reg1,u64 val)378 static inline void reg_pair_from_64(u32 *reg0, u32 *reg1, u64 val)
379 {
380 *reg0 = val >> 32;
381 *reg1 = val;
382 }
383
384 /* Registration of the ABIs */
385 int optee_smc_abi_register(void);
386 void optee_smc_abi_unregister(void);
387 int optee_ffa_abi_register(void);
388 void optee_ffa_abi_unregister(void);
389
390 #endif /*OPTEE_PRIVATE_H*/
391