1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2015-2021, Linaro Limited
4 */
5
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7
8 #include <linux/delay.h>
9 #include <linux/i2c.h>
10 #include <linux/slab.h>
11 #include <linux/tee_drv.h>
12 #include "optee_private.h"
13 #include "optee_rpc_cmd.h"
14
handle_rpc_func_cmd_get_time(struct optee_msg_arg * arg)15 static void handle_rpc_func_cmd_get_time(struct optee_msg_arg *arg)
16 {
17 struct timespec64 ts;
18
19 if (arg->num_params != 1)
20 goto bad;
21 if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
22 OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT)
23 goto bad;
24
25 ktime_get_real_ts64(&ts);
26 arg->params[0].u.value.a = ts.tv_sec;
27 arg->params[0].u.value.b = ts.tv_nsec;
28
29 arg->ret = TEEC_SUCCESS;
30 return;
31 bad:
32 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
33 }
34
35 #if IS_REACHABLE(CONFIG_I2C)
handle_rpc_func_cmd_i2c_transfer(struct tee_context * ctx,struct optee_msg_arg * arg)36 static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx,
37 struct optee_msg_arg *arg)
38 {
39 struct optee *optee = tee_get_drvdata(ctx->teedev);
40 struct tee_param *params;
41 struct i2c_adapter *adapter;
42 struct i2c_msg msg = { };
43 size_t i;
44 int ret = -EOPNOTSUPP;
45 u8 attr[] = {
46 TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT,
47 TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT,
48 TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT,
49 TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT,
50 };
51
52 if (arg->num_params != ARRAY_SIZE(attr)) {
53 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
54 return;
55 }
56
57 params = kmalloc_array(arg->num_params, sizeof(struct tee_param),
58 GFP_KERNEL);
59 if (!params) {
60 arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
61 return;
62 }
63
64 if (optee->ops->from_msg_param(optee, params, arg->num_params,
65 arg->params))
66 goto bad;
67
68 for (i = 0; i < arg->num_params; i++) {
69 if (params[i].attr != attr[i])
70 goto bad;
71 }
72
73 adapter = i2c_get_adapter(params[0].u.value.b);
74 if (!adapter)
75 goto bad;
76
77 if (params[1].u.value.a & OPTEE_RPC_I2C_FLAGS_TEN_BIT) {
78 if (!i2c_check_functionality(adapter,
79 I2C_FUNC_10BIT_ADDR)) {
80 i2c_put_adapter(adapter);
81 goto bad;
82 }
83
84 msg.flags = I2C_M_TEN;
85 }
86
87 msg.addr = params[0].u.value.c;
88 msg.buf = params[2].u.memref.shm->kaddr;
89 msg.len = params[2].u.memref.size;
90
91 switch (params[0].u.value.a) {
92 case OPTEE_RPC_I2C_TRANSFER_RD:
93 msg.flags |= I2C_M_RD;
94 break;
95 case OPTEE_RPC_I2C_TRANSFER_WR:
96 break;
97 default:
98 i2c_put_adapter(adapter);
99 goto bad;
100 }
101
102 ret = i2c_transfer(adapter, &msg, 1);
103
104 if (ret < 0) {
105 arg->ret = TEEC_ERROR_COMMUNICATION;
106 } else {
107 params[3].u.value.a = msg.len;
108 if (optee->ops->to_msg_param(optee, arg->params,
109 arg->num_params, params))
110 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
111 else
112 arg->ret = TEEC_SUCCESS;
113 }
114
115 i2c_put_adapter(adapter);
116 kfree(params);
117 return;
118 bad:
119 kfree(params);
120 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
121 }
122 #else
handle_rpc_func_cmd_i2c_transfer(struct tee_context * ctx,struct optee_msg_arg * arg)123 static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx,
124 struct optee_msg_arg *arg)
125 {
126 arg->ret = TEEC_ERROR_NOT_SUPPORTED;
127 }
128 #endif
129
handle_rpc_func_cmd_wq(struct optee * optee,struct optee_msg_arg * arg)130 static void handle_rpc_func_cmd_wq(struct optee *optee,
131 struct optee_msg_arg *arg)
132 {
133 if (arg->num_params != 1)
134 goto bad;
135
136 if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
137 OPTEE_MSG_ATTR_TYPE_VALUE_INPUT)
138 goto bad;
139
140 switch (arg->params[0].u.value.a) {
141 case OPTEE_RPC_NOTIFICATION_WAIT:
142 if (optee_notif_wait(optee, arg->params[0].u.value.b))
143 goto bad;
144 break;
145 case OPTEE_RPC_NOTIFICATION_SEND:
146 if (optee_notif_send(optee, arg->params[0].u.value.b))
147 goto bad;
148 break;
149 default:
150 goto bad;
151 }
152
153 arg->ret = TEEC_SUCCESS;
154 return;
155 bad:
156 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
157 }
158
handle_rpc_func_cmd_wait(struct optee_msg_arg * arg)159 static void handle_rpc_func_cmd_wait(struct optee_msg_arg *arg)
160 {
161 u32 msec_to_wait;
162
163 if (arg->num_params != 1)
164 goto bad;
165
166 if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
167 OPTEE_MSG_ATTR_TYPE_VALUE_INPUT)
168 goto bad;
169
170 msec_to_wait = arg->params[0].u.value.a;
171
172 /* Go to interruptible sleep */
173 msleep_interruptible(msec_to_wait);
174
175 arg->ret = TEEC_SUCCESS;
176 return;
177 bad:
178 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
179 }
180
handle_rpc_supp_cmd(struct tee_context * ctx,struct optee * optee,struct optee_msg_arg * arg)181 static void handle_rpc_supp_cmd(struct tee_context *ctx, struct optee *optee,
182 struct optee_msg_arg *arg)
183 {
184 struct tee_param *params;
185
186 arg->ret_origin = TEEC_ORIGIN_COMMS;
187
188 params = kmalloc_array(arg->num_params, sizeof(struct tee_param),
189 GFP_KERNEL);
190 if (!params) {
191 arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
192 return;
193 }
194
195 if (optee->ops->from_msg_param(optee, params, arg->num_params,
196 arg->params)) {
197 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
198 goto out;
199 }
200
201 arg->ret = optee_supp_thrd_req(ctx, arg->cmd, arg->num_params, params);
202
203 if (optee->ops->to_msg_param(optee, arg->params, arg->num_params,
204 params))
205 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
206 out:
207 kfree(params);
208 }
209
optee_rpc_cmd_alloc_suppl(struct tee_context * ctx,size_t sz)210 struct tee_shm *optee_rpc_cmd_alloc_suppl(struct tee_context *ctx, size_t sz)
211 {
212 u32 ret;
213 struct tee_param param;
214 struct optee *optee = tee_get_drvdata(ctx->teedev);
215 struct tee_shm *shm;
216
217 param.attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT;
218 param.u.value.a = OPTEE_RPC_SHM_TYPE_APPL;
219 param.u.value.b = sz;
220 param.u.value.c = 0;
221
222 ret = optee_supp_thrd_req(ctx, OPTEE_RPC_CMD_SHM_ALLOC, 1, ¶m);
223 if (ret)
224 return ERR_PTR(-ENOMEM);
225
226 mutex_lock(&optee->supp.mutex);
227 /* Increases count as secure world doesn't have a reference */
228 shm = tee_shm_get_from_id(optee->supp.ctx, param.u.value.c);
229 mutex_unlock(&optee->supp.mutex);
230 return shm;
231 }
232
optee_rpc_cmd_free_suppl(struct tee_context * ctx,struct tee_shm * shm)233 void optee_rpc_cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm)
234 {
235 struct tee_param param;
236
237 param.attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT;
238 param.u.value.a = OPTEE_RPC_SHM_TYPE_APPL;
239 param.u.value.b = tee_shm_get_id(shm);
240 param.u.value.c = 0;
241
242 /*
243 * Match the tee_shm_get_from_id() in cmd_alloc_suppl() as secure
244 * world has released its reference.
245 *
246 * It's better to do this before sending the request to supplicant
247 * as we'd like to let the process doing the initial allocation to
248 * do release the last reference too in order to avoid stacking
249 * many pending fput() on the client process. This could otherwise
250 * happen if secure world does many allocate and free in a single
251 * invoke.
252 */
253 tee_shm_put(shm);
254
255 optee_supp_thrd_req(ctx, OPTEE_RPC_CMD_SHM_FREE, 1, ¶m);
256 }
257
optee_rpc_cmd(struct tee_context * ctx,struct optee * optee,struct optee_msg_arg * arg)258 void optee_rpc_cmd(struct tee_context *ctx, struct optee *optee,
259 struct optee_msg_arg *arg)
260 {
261 switch (arg->cmd) {
262 case OPTEE_RPC_CMD_GET_TIME:
263 handle_rpc_func_cmd_get_time(arg);
264 break;
265 case OPTEE_RPC_CMD_NOTIFICATION:
266 handle_rpc_func_cmd_wq(optee, arg);
267 break;
268 case OPTEE_RPC_CMD_SUSPEND:
269 handle_rpc_func_cmd_wait(arg);
270 break;
271 case OPTEE_RPC_CMD_I2C_TRANSFER:
272 handle_rpc_func_cmd_i2c_transfer(ctx, arg);
273 break;
274 default:
275 handle_rpc_supp_cmd(ctx, optee, arg);
276 }
277 }
278
279
280