2 * Copyright (c) 2015-2016, Linaro Limited
4 * This software is licensed under the terms of the GNU General Public
5 * License version 2, as published by the Free Software Foundation, and
6 * may be copied, distributed, and modified under those terms.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17 #include <linux/delay.h>
18 #include <linux/device.h>
19 #include <linux/slab.h>
20 #include <linux/tee_drv.h>
21 #include "optee_private.h"
22 #include "optee_smc.h"
25 struct list_head link;
30 void optee_wait_queue_init(struct optee_wait_queue *priv)
32 mutex_init(&priv->mu);
33 INIT_LIST_HEAD(&priv->db);
36 void optee_wait_queue_exit(struct optee_wait_queue *priv)
38 mutex_destroy(&priv->mu);
41 static void handle_rpc_func_cmd_get_time(struct optee_msg_arg *arg)
45 if (arg->num_params != 1)
47 if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
48 OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT)
51 getnstimeofday64(&ts);
52 arg->params[0].u.value.a = ts.tv_sec;
53 arg->params[0].u.value.b = ts.tv_nsec;
55 arg->ret = TEEC_SUCCESS;
58 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
61 static struct wq_entry *wq_entry_get(struct optee_wait_queue *wq, u32 key)
67 list_for_each_entry(w, &wq->db, link)
71 w = kmalloc(sizeof(*w), GFP_KERNEL);
73 init_completion(&w->c);
75 list_add_tail(&w->link, &wq->db);
78 mutex_unlock(&wq->mu);
82 static void wq_sleep(struct optee_wait_queue *wq, u32 key)
84 struct wq_entry *w = wq_entry_get(wq, key);
87 wait_for_completion(&w->c);
90 mutex_unlock(&wq->mu);
95 static void wq_wakeup(struct optee_wait_queue *wq, u32 key)
97 struct wq_entry *w = wq_entry_get(wq, key);
103 static void handle_rpc_func_cmd_wq(struct optee *optee,
104 struct optee_msg_arg *arg)
106 if (arg->num_params != 1)
109 if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
110 OPTEE_MSG_ATTR_TYPE_VALUE_INPUT)
113 switch (arg->params[0].u.value.a) {
114 case OPTEE_MSG_RPC_WAIT_QUEUE_SLEEP:
115 wq_sleep(&optee->wait_queue, arg->params[0].u.value.b);
117 case OPTEE_MSG_RPC_WAIT_QUEUE_WAKEUP:
118 wq_wakeup(&optee->wait_queue, arg->params[0].u.value.b);
124 arg->ret = TEEC_SUCCESS;
127 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
130 static void handle_rpc_func_cmd_wait(struct optee_msg_arg *arg)
134 if (arg->num_params != 1)
137 if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
138 OPTEE_MSG_ATTR_TYPE_VALUE_INPUT)
141 msec_to_wait = arg->params[0].u.value.a;
143 /* Go to interruptible sleep */
144 msleep_interruptible(msec_to_wait);
146 arg->ret = TEEC_SUCCESS;
149 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
152 static void handle_rpc_supp_cmd(struct tee_context *ctx,
153 struct optee_msg_arg *arg)
155 struct tee_param *params;
157 arg->ret_origin = TEEC_ORIGIN_COMMS;
159 params = kmalloc_array(arg->num_params, sizeof(struct tee_param),
162 arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
166 if (optee_from_msg_param(params, arg->num_params, arg->params)) {
167 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
171 arg->ret = optee_supp_thrd_req(ctx, arg->cmd, arg->num_params, params);
173 if (optee_to_msg_param(arg->params, arg->num_params, params))
174 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
179 static struct tee_shm *cmd_alloc_suppl(struct tee_context *ctx, size_t sz)
182 struct tee_param param;
183 struct optee *optee = tee_get_drvdata(ctx->teedev);
186 param.attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT;
187 param.u.value.a = OPTEE_MSG_RPC_SHM_TYPE_APPL;
188 param.u.value.b = sz;
191 ret = optee_supp_thrd_req(ctx, OPTEE_MSG_RPC_CMD_SHM_ALLOC, 1, ¶m);
193 return ERR_PTR(-ENOMEM);
195 mutex_lock(&optee->supp.ctx_mutex);
196 /* Increases count as secure world doesn't have a reference */
197 shm = tee_shm_get_from_id(optee->supp.ctx, param.u.value.c);
198 mutex_unlock(&optee->supp.ctx_mutex);
202 static void handle_rpc_func_cmd_shm_alloc(struct tee_context *ctx,
203 struct optee_msg_arg *arg)
210 arg->ret_origin = TEEC_ORIGIN_COMMS;
212 if (!arg->num_params ||
213 arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
214 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
218 for (n = 1; n < arg->num_params; n++) {
219 if (arg->params[n].attr != OPTEE_MSG_ATTR_TYPE_NONE) {
220 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
225 sz = arg->params[0].u.value.b;
226 switch (arg->params[0].u.value.a) {
227 case OPTEE_MSG_RPC_SHM_TYPE_APPL:
228 shm = cmd_alloc_suppl(ctx, sz);
230 case OPTEE_MSG_RPC_SHM_TYPE_KERNEL:
231 shm = tee_shm_alloc(ctx, sz, TEE_SHM_MAPPED);
234 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
239 arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
243 if (tee_shm_get_pa(shm, 0, &pa)) {
244 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
248 arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT;
249 arg->params[0].u.tmem.buf_ptr = pa;
250 arg->params[0].u.tmem.size = sz;
251 arg->params[0].u.tmem.shm_ref = (unsigned long)shm;
252 arg->ret = TEEC_SUCCESS;
258 static void cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm)
260 struct tee_param param;
262 param.attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT;
263 param.u.value.a = OPTEE_MSG_RPC_SHM_TYPE_APPL;
264 param.u.value.b = tee_shm_get_id(shm);
268 * Match the tee_shm_get_from_id() in cmd_alloc_suppl() as secure
269 * world has released its reference.
271 * It's better to do this before sending the request to supplicant
272 * as we'd like to let the process doing the initial allocation to
273 * do release the last reference too in order to avoid stacking
274 * many pending fput() on the client process. This could otherwise
275 * happen if secure world does many allocate and free in a single
280 optee_supp_thrd_req(ctx, OPTEE_MSG_RPC_CMD_SHM_FREE, 1, ¶m);
283 static void handle_rpc_func_cmd_shm_free(struct tee_context *ctx,
284 struct optee_msg_arg *arg)
288 arg->ret_origin = TEEC_ORIGIN_COMMS;
290 if (arg->num_params != 1 ||
291 arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
292 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
296 shm = (struct tee_shm *)(unsigned long)arg->params[0].u.value.b;
297 switch (arg->params[0].u.value.a) {
298 case OPTEE_MSG_RPC_SHM_TYPE_APPL:
299 cmd_free_suppl(ctx, shm);
301 case OPTEE_MSG_RPC_SHM_TYPE_KERNEL:
305 arg->ret = TEEC_ERROR_BAD_PARAMETERS;
307 arg->ret = TEEC_SUCCESS;
310 static void handle_rpc_func_cmd(struct tee_context *ctx, struct optee *optee,
313 struct optee_msg_arg *arg;
315 arg = tee_shm_get_va(shm, 0);
317 pr_err("%s: tee_shm_get_va %p failed\n", __func__, shm);
322 case OPTEE_MSG_RPC_CMD_GET_TIME:
323 handle_rpc_func_cmd_get_time(arg);
325 case OPTEE_MSG_RPC_CMD_WAIT_QUEUE:
326 handle_rpc_func_cmd_wq(optee, arg);
328 case OPTEE_MSG_RPC_CMD_SUSPEND:
329 handle_rpc_func_cmd_wait(arg);
331 case OPTEE_MSG_RPC_CMD_SHM_ALLOC:
332 handle_rpc_func_cmd_shm_alloc(ctx, arg);
334 case OPTEE_MSG_RPC_CMD_SHM_FREE:
335 handle_rpc_func_cmd_shm_free(ctx, arg);
338 handle_rpc_supp_cmd(ctx, arg);
343 * optee_handle_rpc() - handle RPC from secure world
344 * @ctx: context doing the RPC
345 * @param: value of registers for the RPC
347 * Result of RPC is written back into @param.
349 void optee_handle_rpc(struct tee_context *ctx, struct optee_rpc_param *param)
351 struct tee_device *teedev = ctx->teedev;
352 struct optee *optee = tee_get_drvdata(teedev);
356 switch (OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0)) {
357 case OPTEE_SMC_RPC_FUNC_ALLOC:
358 shm = tee_shm_alloc(ctx, param->a1, TEE_SHM_MAPPED);
359 if (!IS_ERR(shm) && !tee_shm_get_pa(shm, 0, &pa)) {
360 reg_pair_from_64(¶m->a1, ¶m->a2, pa);
361 reg_pair_from_64(¶m->a4, ¶m->a5,
370 case OPTEE_SMC_RPC_FUNC_FREE:
371 shm = reg_pair_to_ptr(param->a1, param->a2);
374 case OPTEE_SMC_RPC_FUNC_FOREIGN_INTR:
376 * A foreign interrupt was raised while secure world was
377 * executing, since they are handled in Linux a dummy RPC is
378 * performed to let Linux take the interrupt through the normal
382 case OPTEE_SMC_RPC_FUNC_CMD:
383 shm = reg_pair_to_ptr(param->a1, param->a2);
384 handle_rpc_func_cmd(ctx, optee, shm);
387 pr_warn("Unknown RPC func 0x%x\n",
388 (u32)OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0));
392 param->a0 = OPTEE_SMC_CALL_RETURN_FROM_RPC;