[mirror_ubuntu-focal-kernel.git] / drivers / tee / optee / rpc.c

/*
 * Copyright (c) 2015-2016, Linaro Limited
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/delay.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/tee_drv.h>
#include "optee_private.h"
#include "optee_smc.h"

struct wq_entry {
	struct list_head link;
	struct completion c;
	u32 key;
};

void optee_wait_queue_init(struct optee_wait_queue *priv)
{
	mutex_init(&priv->mu);
	INIT_LIST_HEAD(&priv->db);
}

void optee_wait_queue_exit(struct optee_wait_queue *priv)
{
	mutex_destroy(&priv->mu);
}

static void handle_rpc_func_cmd_get_time(struct optee_msg_arg *arg)
{
	struct timespec64 ts;

	if (arg->num_params != 1)
		goto bad;
	if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
			OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT)
		goto bad;

	getnstimeofday64(&ts);
	arg->params[0].u.value.a = ts.tv_sec;
	arg->params[0].u.value.b = ts.tv_nsec;

	arg->ret = TEEC_SUCCESS;
	return;
bad:
	arg->ret = TEEC_ERROR_BAD_PARAMETERS;
}

static struct wq_entry *wq_entry_get(struct optee_wait_queue *wq, u32 key)
{
	struct wq_entry *w;

	mutex_lock(&wq->mu);

	list_for_each_entry(w, &wq->db, link)
		if (w->key == key)
			goto out;

	w = kmalloc(sizeof(*w), GFP_KERNEL);
	if (w) {
		init_completion(&w->c);
		w->key = key;
		list_add_tail(&w->link, &wq->db);
	}
out:
	mutex_unlock(&wq->mu);
	return w;
}

static void wq_sleep(struct optee_wait_queue *wq, u32 key)
{
	struct wq_entry *w = wq_entry_get(wq, key);

	if (w) {
		wait_for_completion(&w->c);
		mutex_lock(&wq->mu);
		list_del(&w->link);
		mutex_unlock(&wq->mu);
		kfree(w);
	}
}

static void wq_wakeup(struct optee_wait_queue *wq, u32 key)
{
	struct wq_entry *w = wq_entry_get(wq, key);

	if (w)
		complete(&w->c);
}

static void handle_rpc_func_cmd_wq(struct optee *optee,
				   struct optee_msg_arg *arg)
{
	if (arg->num_params != 1)
		goto bad;

	if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
			OPTEE_MSG_ATTR_TYPE_VALUE_INPUT)
		goto bad;

	switch (arg->params[0].u.value.a) {
	case OPTEE_MSG_RPC_WAIT_QUEUE_SLEEP:
		wq_sleep(&optee->wait_queue, arg->params[0].u.value.b);
		break;
	case OPTEE_MSG_RPC_WAIT_QUEUE_WAKEUP:
		wq_wakeup(&optee->wait_queue, arg->params[0].u.value.b);
		break;
	default:
		goto bad;
	}

	arg->ret = TEEC_SUCCESS;
	return;
bad:
	arg->ret = TEEC_ERROR_BAD_PARAMETERS;
}

static void handle_rpc_func_cmd_wait(struct optee_msg_arg *arg)
{
	u32 msec_to_wait;

	if (arg->num_params != 1)
		goto bad;

	if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
			OPTEE_MSG_ATTR_TYPE_VALUE_INPUT)
		goto bad;

	msec_to_wait = arg->params[0].u.value.a;

	/* set task's state to interruptible sleep */
	set_current_state(TASK_INTERRUPTIBLE);

	/* take a nap */
	msleep(msec_to_wait);

	arg->ret = TEEC_SUCCESS;
	return;
bad:
	arg->ret = TEEC_ERROR_BAD_PARAMETERS;
}

static void handle_rpc_supp_cmd(struct tee_context *ctx,
				struct optee_msg_arg *arg)
{
	struct tee_param *params;

	arg->ret_origin = TEEC_ORIGIN_COMMS;

	params = kmalloc_array(arg->num_params, sizeof(struct tee_param),
			       GFP_KERNEL);
	if (!params) {
		arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
		return;
	}

	if (optee_from_msg_param(params, arg->num_params, arg->params)) {
		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
		goto out;
	}

	arg->ret = optee_supp_thrd_req(ctx, arg->cmd, arg->num_params, params);

	if (optee_to_msg_param(arg->params, arg->num_params, params))
		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
out:
	kfree(params);
}

static struct tee_shm *cmd_alloc_suppl(struct tee_context *ctx, size_t sz)
{
	u32 ret;
	struct tee_param param;
	struct optee *optee = tee_get_drvdata(ctx->teedev);
	struct tee_shm *shm;

	param.attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT;
	param.u.value.a = OPTEE_MSG_RPC_SHM_TYPE_APPL;
	param.u.value.b = sz;
	param.u.value.c = 0;

	ret = optee_supp_thrd_req(ctx, OPTEE_MSG_RPC_CMD_SHM_ALLOC, 1, &param);
	if (ret)
		return ERR_PTR(-ENOMEM);

	mutex_lock(&optee->supp.ctx_mutex);
	/* Increases count as secure world doesn't have a reference */
	shm = tee_shm_get_from_id(optee->supp.ctx, param.u.value.c);
	mutex_unlock(&optee->supp.ctx_mutex);
	return shm;
}

static void handle_rpc_func_cmd_shm_alloc(struct tee_context *ctx,
					  struct optee_msg_arg *arg)
{
	phys_addr_t pa;
	struct tee_shm *shm;
	size_t sz;
	size_t n;

	arg->ret_origin = TEEC_ORIGIN_COMMS;

	if (!arg->num_params ||
	    arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
		return;
	}

	for (n = 1; n < arg->num_params; n++) {
		if (arg->params[n].attr != OPTEE_MSG_ATTR_TYPE_NONE) {
			arg->ret = TEEC_ERROR_BAD_PARAMETERS;
			return;
		}
	}

	sz = arg->params[0].u.value.b;
	switch (arg->params[0].u.value.a) {
	case OPTEE_MSG_RPC_SHM_TYPE_APPL:
		shm = cmd_alloc_suppl(ctx, sz);
		break;
	case OPTEE_MSG_RPC_SHM_TYPE_KERNEL:
		shm = tee_shm_alloc(ctx, sz, TEE_SHM_MAPPED);
		break;
	default:
		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
		return;
	}

	if (IS_ERR(shm)) {
		arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
		return;
	}

	if (tee_shm_get_pa(shm, 0, &pa)) {
		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
		goto bad;
	}

	arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT;
	arg->params[0].u.tmem.buf_ptr = pa;
	arg->params[0].u.tmem.size = sz;
	arg->params[0].u.tmem.shm_ref = (unsigned long)shm;
	arg->ret = TEEC_SUCCESS;
	return;
bad:
	tee_shm_free(shm);
}

static void cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm)
{
	struct tee_param param;

	param.attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT;
	param.u.value.a = OPTEE_MSG_RPC_SHM_TYPE_APPL;
	param.u.value.b = tee_shm_get_id(shm);
	param.u.value.c = 0;

	/*
	 * Match the tee_shm_get_from_id() in cmd_alloc_suppl() as secure
	 * world has released its reference.
	 *
	 * It's better to do this before sending the request to supplicant
	 * as we'd like to let the process doing the initial allocation to
	 * do release the last reference too in order to avoid stacking
	 * many pending fput() on the client process. This could otherwise
	 * happen if secure world does many allocate and free in a single
	 * invoke.
	 */
	tee_shm_put(shm);

	optee_supp_thrd_req(ctx, OPTEE_MSG_RPC_CMD_SHM_FREE, 1, &param);
}

static void handle_rpc_func_cmd_shm_free(struct tee_context *ctx,
					 struct optee_msg_arg *arg)
{
	struct tee_shm *shm;

	arg->ret_origin = TEEC_ORIGIN_COMMS;

	if (arg->num_params != 1 ||
	    arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
		return;
	}

	shm = (struct tee_shm *)(unsigned long)arg->params[0].u.value.b;
	switch (arg->params[0].u.value.a) {
	case OPTEE_MSG_RPC_SHM_TYPE_APPL:
		cmd_free_suppl(ctx, shm);
		break;
	case OPTEE_MSG_RPC_SHM_TYPE_KERNEL:
		tee_shm_free(shm);
		break;
	default:
		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
	}
	arg->ret = TEEC_SUCCESS;
}

static void handle_rpc_func_cmd(struct tee_context *ctx, struct optee *optee,
				struct tee_shm *shm)
{
	struct optee_msg_arg *arg;

	arg = tee_shm_get_va(shm, 0);
	if (IS_ERR(arg)) {
		pr_err("%s: tee_shm_get_va %p failed\n", __func__, shm);
		return;
	}

	switch (arg->cmd) {
	case OPTEE_MSG_RPC_CMD_GET_TIME:
		handle_rpc_func_cmd_get_time(arg);
		break;
	case OPTEE_MSG_RPC_CMD_WAIT_QUEUE:
		handle_rpc_func_cmd_wq(optee, arg);
		break;
	case OPTEE_MSG_RPC_CMD_SUSPEND:
		handle_rpc_func_cmd_wait(arg);
		break;
	case OPTEE_MSG_RPC_CMD_SHM_ALLOC:
		handle_rpc_func_cmd_shm_alloc(ctx, arg);
		break;
	case OPTEE_MSG_RPC_CMD_SHM_FREE:
		handle_rpc_func_cmd_shm_free(ctx, arg);
		break;
	default:
		handle_rpc_supp_cmd(ctx, arg);
	}
}

/**
 * optee_handle_rpc() - handle RPC from secure world
 * @ctx:	context doing the RPC
 * @param:	value of registers for the RPC
 *
 * Result of RPC is written back into @param.
 */
void optee_handle_rpc(struct tee_context *ctx, struct optee_rpc_param *param)
{
	struct tee_device *teedev = ctx->teedev;
	struct optee *optee = tee_get_drvdata(teedev);
	struct tee_shm *shm;
	phys_addr_t pa;

	switch (OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0)) {
	case OPTEE_SMC_RPC_FUNC_ALLOC:
		shm = tee_shm_alloc(ctx, param->a1, TEE_SHM_MAPPED);
		if (!IS_ERR(shm) && !tee_shm_get_pa(shm, 0, &pa)) {
			reg_pair_from_64(&param->a1, &param->a2, pa);
			reg_pair_from_64(&param->a4, &param->a5,
					 (unsigned long)shm);
		} else {
			param->a1 = 0;
			param->a2 = 0;
			param->a4 = 0;
			param->a5 = 0;
		}
		break;
	case OPTEE_SMC_RPC_FUNC_FREE:
		shm = reg_pair_to_ptr(param->a1, param->a2);
		tee_shm_free(shm);
		break;
	case OPTEE_SMC_RPC_FUNC_IRQ:
		/*
		 * An IRQ was raised while secure world was executing,
		 * since all IRQs are handled in Linux a dummy RPC is
		 * performed to let Linux take the IRQ through the normal
		 * vector.
		 */
		break;
	case OPTEE_SMC_RPC_FUNC_CMD:
		shm = reg_pair_to_ptr(param->a1, param->a2);
		handle_rpc_func_cmd(ctx, optee, shm);
		break;
	default:
		pr_warn("Unknown RPC func 0x%x\n",
			(u32)OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0));
		break;
	}

	param->a0 = OPTEE_SMC_CALL_RETURN_FROM_RPC;
}
Commit	Line	Data
4fb0a5eb JW	1	/*
	2	* Copyright (c) 2015-2016, Linaro Limited
	3	*
	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.
	7	*
	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.
	12	*
	13	*/
	14
	15	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	16
	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"
	23
	24	struct wq_entry {
	25	struct list_head link;
	26	struct completion c;
	27	u32 key;
	28	};
	29
	30	void optee_wait_queue_init(struct optee_wait_queue *priv)
	31	{
	32	mutex_init(&priv->mu);
	33	INIT_LIST_HEAD(&priv->db);
	34	}
	35
	36	void optee_wait_queue_exit(struct optee_wait_queue *priv)
	37	{
	38	mutex_destroy(&priv->mu);
	39	}
	40
	41	static void handle_rpc_func_cmd_get_time(struct optee_msg_arg *arg)
	42	{
	43	struct timespec64 ts;
	44
	45	if (arg->num_params != 1)
	46	goto bad;
	47	if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
	48	OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT)
	49	goto bad;
	50
	51	getnstimeofday64(&ts);
	52	arg->params[0].u.value.a = ts.tv_sec;
	53	arg->params[0].u.value.b = ts.tv_nsec;
	54
	55	arg->ret = TEEC_SUCCESS;
	56	return;
	57	bad:
	58	arg->ret = TEEC_ERROR_BAD_PARAMETERS;
	59	}
	60
	61	static struct wq_entry wq_entry_get(struct optee_wait_queue wq, u32 key)
	62	{
	63	struct wq_entry *w;
	64
65	mutex_lock(&wq->mu);
66
67	list_for_each_entry(w, &wq->db, link)
68	if (w->key == key)
69	goto out;
70
71	w = kmalloc(sizeof(*w), GFP_KERNEL);
72	if (w) {
73	init_completion(&w->c);
74	w->key = key;
75	list_add_tail(&w->link, &wq->db);
76	}
77	out:
78	mutex_unlock(&wq->mu);
79	return w;
80	}
81
82	static void wq_sleep(struct optee_wait_queue *wq, u32 key)
83	{
84	struct wq_entry *w = wq_entry_get(wq, key);
85
86	if (w) {
87	wait_for_completion(&w->c);
88	mutex_lock(&wq->mu);
89	list_del(&w->link);
90	mutex_unlock(&wq->mu);
91	kfree(w);
92	}
93	}
94
95	static void wq_wakeup(struct optee_wait_queue *wq, u32 key)
96	{
97	struct wq_entry *w = wq_entry_get(wq, key);
98
99	if (w)
100	complete(&w->c);
101	}
102
103	static void handle_rpc_func_cmd_wq(struct optee *optee,
104	struct optee_msg_arg *arg)
105	{
106	if (arg->num_params != 1)
107	goto bad;
108
109	if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
110	OPTEE_MSG_ATTR_TYPE_VALUE_INPUT)
111	goto bad;
112
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);
116	break;
117	case OPTEE_MSG_RPC_WAIT_QUEUE_WAKEUP:
118	wq_wakeup(&optee->wait_queue, arg->params[0].u.value.b);
119	break;
120	default:
121	goto bad;
122	}
123
124	arg->ret = TEEC_SUCCESS;
125	return;
126	bad:
127	arg->ret = TEEC_ERROR_BAD_PARAMETERS;
128	}
129
130	static void handle_rpc_func_cmd_wait(struct optee_msg_arg *arg)
131	{
132	u32 msec_to_wait;
133
134	if (arg->num_params != 1)
135	goto bad;
136
137	if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
138	OPTEE_MSG_ATTR_TYPE_VALUE_INPUT)
139	goto bad;
140
141	msec_to_wait = arg->params[0].u.value.a;
142
143	/* set task's state to interruptible sleep */
144	set_current_state(TASK_INTERRUPTIBLE);
145
146	/* take a nap */
147	msleep(msec_to_wait);
148
149	arg->ret = TEEC_SUCCESS;
150	return;
151	bad:
152	arg->ret = TEEC_ERROR_BAD_PARAMETERS;
153	}
154
155	static void handle_rpc_supp_cmd(struct tee_context *ctx,
156	struct optee_msg_arg *arg)
157	{
158	struct tee_param *params;
159
160	arg->ret_origin = TEEC_ORIGIN_COMMS;
161
162	params = kmalloc_array(arg->num_params, sizeof(struct tee_param),
163	GFP_KERNEL);
164	if (!params) {
165	arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
166	return;
167	}
168
169	if (optee_from_msg_param(params, arg->num_params, arg->params)) {
170	arg->ret = TEEC_ERROR_BAD_PARAMETERS;
171	goto out;
172	}
173
174	arg->ret = optee_supp_thrd_req(ctx, arg->cmd, arg->num_params, params);
175
176	if (optee_to_msg_param(arg->params, arg->num_params, params))
177	arg->ret = TEEC_ERROR_BAD_PARAMETERS;
178	out:
179	kfree(params);
180	}
181
182	static struct tee_shm cmd_alloc_suppl(struct tee_context ctx, size_t sz)
183	{
184	u32 ret;
185	struct tee_param param;
186	struct optee *optee = tee_get_drvdata(ctx->teedev);
187	struct tee_shm *shm;
188
189	param.attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT;
190	param.u.value.a = OPTEE_MSG_RPC_SHM_TYPE_APPL;
191	param.u.value.b = sz;
192	param.u.value.c = 0;
193
194	ret = optee_supp_thrd_req(ctx, OPTEE_MSG_RPC_CMD_SHM_ALLOC, 1, &param);
195	if (ret)
196	return ERR_PTR(-ENOMEM);
197
198	mutex_lock(&optee->supp.ctx_mutex);
199	/* Increases count as secure world doesn't have a reference */
200	shm = tee_shm_get_from_id(optee->supp.ctx, param.u.value.c);
201	mutex_unlock(&optee->supp.ctx_mutex);
202	return shm;
203	}
204
205	static void handle_rpc_func_cmd_shm_alloc(struct tee_context *ctx,
206	struct optee_msg_arg *arg)
207	{
208	phys_addr_t pa;
209	struct tee_shm *shm;
210	size_t sz;
211	size_t n;
212
213	arg->ret_origin = TEEC_ORIGIN_COMMS;
214
215	if (!arg->num_params \|\|
216	arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
217	arg->ret = TEEC_ERROR_BAD_PARAMETERS;
218	return;
219	}
220
221	for (n = 1; n < arg->num_params; n++) {
222	if (arg->params[n].attr != OPTEE_MSG_ATTR_TYPE_NONE) {
223	arg->ret = TEEC_ERROR_BAD_PARAMETERS;
224	return;
225	}
226	}
227
228	sz = arg->params[0].u.value.b;
229	switch (arg->params[0].u.value.a) {
230	case OPTEE_MSG_RPC_SHM_TYPE_APPL:
231	shm = cmd_alloc_suppl(ctx, sz);
232	break;
233	case OPTEE_MSG_RPC_SHM_TYPE_KERNEL:
234	shm = tee_shm_alloc(ctx, sz, TEE_SHM_MAPPED);
235	break;
236	default:
237	arg->ret = TEEC_ERROR_BAD_PARAMETERS;
238	return;
239	}
240
241	if (IS_ERR(shm)) {
242	arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
243	return;
244	}
245
246	if (tee_shm_get_pa(shm, 0, &pa)) {
247	arg->ret = TEEC_ERROR_BAD_PARAMETERS;
248	goto bad;
249	}
250
251	arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT;
252	arg->params[0].u.tmem.buf_ptr = pa;
253	arg->params[0].u.tmem.size = sz;
254	arg->params[0].u.tmem.shm_ref = (unsigned long)shm;
255	arg->ret = TEEC_SUCCESS;
256	return;
257	bad:
258	tee_shm_free(shm);
259	}
260
261	static void cmd_free_suppl(struct tee_context ctx, struct tee_shm shm)
262	{
263	struct tee_param param;
264
265	param.attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT;
266	param.u.value.a = OPTEE_MSG_RPC_SHM_TYPE_APPL;
267	param.u.value.b = tee_shm_get_id(shm);
268	param.u.value.c = 0;
269
270	/*
271	* Match the tee_shm_get_from_id() in cmd_alloc_suppl() as secure
272	* world has released its reference.
273	*
274	* It's better to do this before sending the request to supplicant
275	* as we'd like to let the process doing the initial allocation to
276	* do release the last reference too in order to avoid stacking
277	* many pending fput() on the client process. This could otherwise
278	* happen if secure world does many allocate and free in a single
279	* invoke.
280	*/
281	tee_shm_put(shm);
282
283	optee_supp_thrd_req(ctx, OPTEE_MSG_RPC_CMD_SHM_FREE, 1, &param);
284	}
285
286	static void handle_rpc_func_cmd_shm_free(struct tee_context *ctx,
287	struct optee_msg_arg *arg)
288	{
289	struct tee_shm *shm;
290
291	arg->ret_origin = TEEC_ORIGIN_COMMS;
292
293	if (arg->num_params != 1 \|\|
294	arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
295	arg->ret = TEEC_ERROR_BAD_PARAMETERS;
296	return;
297	}
298
299	shm = (struct tee_shm *)(unsigned long)arg->params[0].u.value.b;
300	switch (arg->params[0].u.value.a) {
301	case OPTEE_MSG_RPC_SHM_TYPE_APPL:
302	cmd_free_suppl(ctx, shm);
303	break;
304	case OPTEE_MSG_RPC_SHM_TYPE_KERNEL:
305	tee_shm_free(shm);
306	break;
307	default:
308	arg->ret = TEEC_ERROR_BAD_PARAMETERS;
309	}
310	arg->ret = TEEC_SUCCESS;
311	}
312
313	static void handle_rpc_func_cmd(struct tee_context ctx, struct optee optee,
314	struct tee_shm *shm)
315	{
316	struct optee_msg_arg *arg;
317
318	arg = tee_shm_get_va(shm, 0);
319	if (IS_ERR(arg)) {
320	pr_err("%s: tee_shm_get_va %p failed\n", __func__, shm);
321	return;
322	}
323
324	switch (arg->cmd) {
325	case OPTEE_MSG_RPC_CMD_GET_TIME:
326	handle_rpc_func_cmd_get_time(arg);
327	break;
328	case OPTEE_MSG_RPC_CMD_WAIT_QUEUE:
329	handle_rpc_func_cmd_wq(optee, arg);
330	break;
331	case OPTEE_MSG_RPC_CMD_SUSPEND:
332	handle_rpc_func_cmd_wait(arg);
333	break;
334	case OPTEE_MSG_RPC_CMD_SHM_ALLOC:
335	handle_rpc_func_cmd_shm_alloc(ctx, arg);
336	break;
337	case OPTEE_MSG_RPC_CMD_SHM_FREE:
338	handle_rpc_func_cmd_shm_free(ctx, arg);
339	break;
340	default:
341	handle_rpc_supp_cmd(ctx, arg);
342	}
343	}
344
345	/**
346	* optee_handle_rpc() - handle RPC from secure world
347	* @ctx: context doing the RPC
348	* @param: value of registers for the RPC
349	*
350	* Result of RPC is written back into @param.
351	*/
352	void optee_handle_rpc(struct tee_context ctx, struct optee_rpc_param param)
353	{
354	struct tee_device *teedev = ctx->teedev;
355	struct optee *optee = tee_get_drvdata(teedev);
356	struct tee_shm *shm;
357	phys_addr_t pa;
358
359	switch (OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0)) {
360	case OPTEE_SMC_RPC_FUNC_ALLOC:
361	shm = tee_shm_alloc(ctx, param->a1, TEE_SHM_MAPPED);
362	if (!IS_ERR(shm) && !tee_shm_get_pa(shm, 0, &pa)) {
363	reg_pair_from_64(&param->a1, &param->a2, pa);
364	reg_pair_from_64(&param->a4, &param->a5,
365	(unsigned long)shm);
366	} else {
367	param->a1 = 0;
368	param->a2 = 0;
369	param->a4 = 0;
370	param->a5 = 0;
371	}
372	break;
373	case OPTEE_SMC_RPC_FUNC_FREE:
374	shm = reg_pair_to_ptr(param->a1, param->a2);
375	tee_shm_free(shm);
376	break;
377	case OPTEE_SMC_RPC_FUNC_IRQ:
378	/*
379	* An IRQ was raised while secure world was executing,
380	* since all IRQs are handled in Linux a dummy RPC is
381	* performed to let Linux take the IRQ through the normal
382	* vector.
383	*/
384	break;
385	case OPTEE_SMC_RPC_FUNC_CMD:
386	shm = reg_pair_to_ptr(param->a1, param->a2);
387	handle_rpc_func_cmd(ctx, optee, shm);
388	break;
389	default:
390	pr_warn("Unknown RPC func 0x%x\n",
391	(u32)OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0));
392	break;
393	}
394
395	param->a0 = OPTEE_SMC_CALL_RETURN_FROM_RPC;
396	}