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
15static 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;
31bad:
32	arg->ret = TEEC_ERROR_BAD_PARAMETERS;
33}
34
35#if IS_REACHABLE(CONFIG_I2C)
36static 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;
118bad:
119	kfree(params);
120	arg->ret = TEEC_ERROR_BAD_PARAMETERS;
121}
122#else
123static 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
130static 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;
155bad:
156	arg->ret = TEEC_ERROR_BAD_PARAMETERS;
157}
158
159static 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;
177bad:
178	arg->ret = TEEC_ERROR_BAD_PARAMETERS;
179}
180
181static 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;
206out:
207	kfree(params);
208}
209
210struct 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, &param);
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
233void 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, &param);
256}
257
258void 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