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
reg_pair_to_ptr(u32 reg0,u32 reg1)191 static inline void *reg_pair_to_ptr(u32 reg0, u32 reg1)
192 {
193 return (void *)(unsigned long)(((u64)reg0 << 32) | reg1);
194 }
195
reg_pair_from_64(u32 * reg0,u32 * reg1,u64 val)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*/
203