drivers/tee/optee/call.c - kernel/linux-linaro-stable.git - Linaro Git Browser

 /*
  * Copyright (c) 2015, 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.
  *
  */
 #include <linux/types.h>
 #include <linux/err.h>
 #include <linux/errno.h>
 #include <linux/slab.h>
 #include <linux/uaccess.h>
 #include <linux/device.h>
 #include <linux/tee_drv.h>
 #include <linux/arm-smccc.h>
 #include "optee_private.h"
 #include "optee_smc.h"

 struct optee_call_waiter {
 	struct list_head list_node;
 	struct completion c;
 	bool completed;
 };

 static void optee_cq_wait_init(struct optee_call_queue *cq,
 			struct optee_call_waiter *w)
 {
 	mutex_lock(&cq->mutex);
 	/*
 	 * We add ourselves to the queue, but we don't wait. This
 	 * guarentees that we don't lose a completion if secure world
 	 * returns busy and another thread just exited and try to complete
 	 * someone.
 	 */
 	w->completed = false;
 	init_completion(&w->c);
 	list_add_tail(&w->list_node, &cq->waiters);
 	mutex_unlock(&cq->mutex);
 }

 static void optee_cq_wait_for_completion(struct optee_call_queue *cq,
 			struct optee_call_waiter *w)
 {
 	wait_for_completion(&w->c);

 	mutex_lock(&cq->mutex);

 	/* Move to end of list to get out of the way for other waiters */
 	list_del(&w->list_node);
 	w->completed = false;
 	reinit_completion(&w->c);
 	list_add_tail(&w->list_node, &cq->waiters);

 	mutex_unlock(&cq->mutex);
 }

 static void optee_cq_complete_one(struct optee_call_queue *cq)
 {
 	struct optee_call_waiter *w;

 	list_for_each_entry(w, &cq->waiters, list_node) {
 		if (!w->completed) {
 			complete(&w->c);
 			w->completed = true;
 			break;
 		}
 	}
 }

 static void optee_cq_wait_final(struct optee_call_queue *cq,
 			struct optee_call_waiter *w)
 {
 	mutex_lock(&cq->mutex);

 	/* Get out of the list */
 	list_del(&w->list_node);

 	optee_cq_complete_one(cq);
 	/*
 	 * If we're completed we've got a completion that some other task
 	 * could have used instead.
 	 */
 	if (w->completed)
 		optee_cq_complete_one(cq);

 	mutex_unlock(&cq->mutex);
 }

 /* Requires the filpstate mutex to be held */
 static struct optee_session *find_session(struct optee_context_data *ctxdata,
 			u32 session_id)
 {
 	struct optee_session *sess;

 	list_for_each_entry(sess, &ctxdata->sess_list, list_node)
 		if (sess->session_id == session_id)
 			return sess;
 	return NULL;
 }

 u32 optee_do_call_with_arg(struct tee_context *ctx, phys_addr_t parg)
 {
 	struct optee *optee = tee_get_drvdata(ctx->teedev);
 	struct optee_call_waiter w;
 	struct optee_rpc_param param = { };
 	u32 ret;

 	param.a0 = OPTEE_SMC_CALL_WITH_ARG;
 	reg_pair_from_64(&param.a1, &param.a2, parg);
 	/* Initialize waiter */
 	optee_cq_wait_init(&optee->call_queue, &w);
 	while (true) {
 		struct arm_smccc_res res;

 		optee->invoke_fn(param.a0, param.a1, param.a2, param.a3,
 				 param.a4, param.a5, param.a6, param.a7,
 				 &res);

 		if (res.a0 == OPTEE_SMC_RETURN_ETHREAD_LIMIT) {
 			/*
 			 * Out of threads in secure world, wait for a thread
 			 * become available.
 			 */
 			optee_cq_wait_for_completion(&optee->call_queue, &w);
 		} else if (OPTEE_SMC_RETURN_IS_RPC(res.a0)) {
 			param.a0 = res.a0;
 			param.a1 = res.a1;
 			param.a2 = res.a2;
 			param.a3 = res.a3;
 			optee_handle_rpc(ctx, &param);
 		} else {
 			ret = res.a0;
 			break;
 		}
 	}
 	/*
 	 * We're done with our thread in secure world, if there's any
 	 * thread waiters wake up one.
 	 */
 	optee_cq_wait_final(&optee->call_queue, &w);
 	return ret;
 }

 static struct tee_shm *get_msg_arg(struct tee_context *ctx, size_t num_params,
 			struct optee_msg_arg **msg_arg, phys_addr_t *msg_parg)
 {
 	int rc;
 	struct tee_shm *shm;
 	struct optee_msg_arg *ma;

 	shm = tee_shm_alloc(ctx->teedev, OPTEE_MSG_GET_ARG_SIZE(num_params),
 			    TEE_SHM_MAPPED);
 	if (IS_ERR(shm))
 		return shm;
 	ma = tee_shm_get_va(shm, 0);
 	if (IS_ERR(ma)) {
 		rc = PTR_ERR(ma);
 		goto out;
 	}
 	rc = tee_shm_get_pa(shm, 0, msg_parg);
 	if (rc)
 		goto out;

 	memset(ma, 0, OPTEE_MSG_GET_ARG_SIZE(num_params));
 	ma->num_params = num_params;
 	*msg_arg = ma;
 out:
 	if (rc) {
 		tee_shm_free(shm);
 		return ERR_PTR(rc);
 	}
 	return shm;
 }

 int optee_open_session(struct tee_context *ctx,
 			struct tee_ioctl_open_session_arg *arg,
 			struct tee_param *param)
 {
 	struct optee_context_data *ctxdata = ctx->data;
 	int rc;
 	struct tee_shm *shm;
 	struct optee_msg_arg *msg_arg;
 	phys_addr_t msg_parg;
 	struct optee_msg_param *msg_param;
 	struct optee_session *sess = NULL;

 	/* +2 for the meta parameters added below */
 	shm = get_msg_arg(ctx, arg->num_params + 2, &msg_arg, &msg_parg);
 	if (IS_ERR(shm))
 		return PTR_ERR(shm);

 	msg_arg->cmd = OPTEE_MSG_CMD_OPEN_SESSION;
 	msg_arg->cancel_id = arg->cancel_id;
 	msg_param = OPTEE_MSG_GET_PARAMS(msg_arg);

 	/*
 	 * Initialize and add the meta parameters needed when opening a
 	 * session.
 	 */
 	msg_param[0].attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT |
 			    OPTEE_MSG_ATTR_META;
 	msg_param[1].attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT |
 			    OPTEE_MSG_ATTR_META;
 	memcpy(&msg_param[0].u.value, arg->uuid, sizeof(arg->uuid));
 	memcpy(&msg_param[1].u.value, arg->uuid, sizeof(arg->clnt_uuid));
 	msg_param[1].u.value.c = arg->clnt_login;

 	rc = optee_to_msg_param(msg_param + 2, arg->num_params, param);
 	if (rc)
 		goto out;

 	sess = kzalloc(sizeof(struct optee_session), GFP_KERNEL);
 	if (!sess) {
 		rc = -ENOMEM;
 		goto out;
 	}

 	if (optee_do_call_with_arg(ctx, msg_parg)) {
 		msg_arg->ret = TEEC_ERROR_COMMUNICATION;
 		msg_arg->ret_origin = TEEC_ORIGIN_COMMS;
 	}

 	if (msg_arg->ret == TEEC_SUCCESS) {
 		/* A new session has been created, add it to the list. */
 		sess->session_id = msg_arg->session;
 		mutex_lock(&ctxdata->mutex);
 		list_add(&sess->list_node, &ctxdata->sess_list);
 		mutex_unlock(&ctxdata->mutex);
 		sess = NULL;
 	}

 	if (optee_from_msg_param(param, arg->num_params, msg_param + 2)) {
 		arg->ret = TEEC_ERROR_COMMUNICATION;
 		arg->ret_origin = TEEC_ORIGIN_COMMS;
 		/* Close session again to avoid leakage */
 		optee_close_session(ctx, msg_arg->session);
 	} else {
 		arg->session = msg_arg->session;
 		arg->ret = msg_arg->ret;
 		arg->ret_origin = msg_arg->ret_origin;
 	}
 out:
 	kfree(sess);
 	tee_shm_free(shm);
 	return rc;
 }

 int optee_close_session(struct tee_context *ctx, u32 session)
 {
 	struct optee_context_data *ctxdata = ctx->data;
 	struct tee_shm *shm;
 	struct optee_msg_arg *msg_arg;
 	phys_addr_t msg_parg;
 	struct optee_session *sess;

 	/* Check that the session is valid and remove it from the list */
 	mutex_lock(&ctxdata->mutex);
 	sess = find_session(ctxdata, session);
 	if (sess)
 		list_del(&sess->list_node);
 	mutex_unlock(&ctxdata->mutex);
 	if (!sess)
 		return -EINVAL;
 	kfree(sess);

 	shm = get_msg_arg(ctx, 0, &msg_arg, &msg_parg);
 	if (IS_ERR(shm))
 		return PTR_ERR(shm);

 	msg_arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION;
 	msg_arg->session = session;
 	optee_do_call_with_arg(ctx, msg_parg);

 	tee_shm_free(shm);
 	return 0;
 }

 int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,
 			struct tee_param *param)
 {
 	struct optee_context_data *ctxdata = ctx->data;
 	struct tee_shm *shm;
 	struct optee_msg_arg *msg_arg;
 	phys_addr_t msg_parg;
 	struct optee_msg_param *msg_param;
 	struct optee_session *sess;
 	int rc;

 	/* Check that the session is valid */
 	mutex_lock(&ctxdata->mutex);
 	sess = find_session(ctxdata, arg->session);
 	mutex_unlock(&ctxdata->mutex);
 	if (!sess)
 		return -EINVAL;

 	shm = get_msg_arg(ctx, arg->num_params, &msg_arg, &msg_parg);
 	if (IS_ERR(shm))
 		return PTR_ERR(shm);
 	msg_arg->cmd = OPTEE_MSG_CMD_INVOKE_COMMAND;
 	msg_arg->func = arg->func;
 	msg_arg->session = arg->session;
 	msg_arg->cancel_id = arg->cancel_id;
 	msg_param = OPTEE_MSG_GET_PARAMS(msg_arg);

 	rc = optee_to_msg_param(msg_param, arg->num_params, param);
 	if (rc)
 		goto out;

 	if (optee_do_call_with_arg(ctx, msg_parg)) {
 		msg_arg->ret = TEEC_ERROR_COMMUNICATION;
 		msg_arg->ret_origin = TEEC_ORIGIN_COMMS;
 	}

 	if (optee_from_msg_param(param, arg->num_params, msg_param)) {
 		msg_arg->ret = TEEC_ERROR_COMMUNICATION;
 		msg_arg->ret_origin = TEEC_ORIGIN_COMMS;
 	}

 	arg->ret = msg_arg->ret;
 	arg->ret_origin = msg_arg->ret_origin;
 out:
 	tee_shm_free(shm);
 	return rc;
 }

 int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session)
 {
 	struct optee_context_data *ctxdata = ctx->data;
 	struct tee_shm *shm;
 	struct optee_msg_arg *msg_arg;
 	phys_addr_t msg_parg;
 	struct optee_session *sess;

 	/* Check that the session is valid */
 	mutex_lock(&ctxdata->mutex);
 	sess = find_session(ctxdata, session);
 	mutex_unlock(&ctxdata->mutex);
 	if (!sess)
 		return -EINVAL;

 	shm = get_msg_arg(ctx, 0, &msg_arg, &msg_parg);
 	if (IS_ERR(shm))
 		return PTR_ERR(shm);

 	msg_arg->cmd = OPTEE_MSG_CMD_CANCEL;
 	msg_arg->session = session;
 	msg_arg->cancel_id = cancel_id;
 	optee_do_call_with_arg(ctx, msg_parg);

 	tee_shm_free(shm);
 	return 0;
 }

 void optee_enable_shm_cache(struct optee *optee)
 {
 	struct optee_call_waiter w;

 	/* We need to retry until secure world isn't busy. */
 	optee_cq_wait_init(&optee->call_queue, &w);
 	while (true) {
 		struct arm_smccc_res res;

 		optee->invoke_fn(OPTEE_SMC_ENABLE_SHM_CACHE, 0, 0, 0, 0, 0, 0,
 				 0, &res);
 		if (res.a0 == OPTEE_SMC_RETURN_OK)
 			break;
 		optee_cq_wait_for_completion(&optee->call_queue, &w);
 	}
 	optee_cq_wait_final(&optee->call_queue, &w);
 }

 void optee_disable_shm_cache(struct optee *optee)
 {
 	struct optee_call_waiter w;

 	/* We need to retry until secure world isn't busy. */
 	optee_cq_wait_init(&optee->call_queue, &w);
 	while (true) {
 		struct arm_smccc_res res;

 		optee->invoke_fn(OPTEE_SMC_DISABLE_SHM_CACHE, 0, 0, 0, 0, 0, 0,
 				 0, &res);
 		if (res.a0 == OPTEE_SMC_RETURN_ENOTAVAIL)
 			break; /* All shm's freed */
 		if (res.a0 == OPTEE_SMC_RETURN_OK) {
 			struct tee_shm *shm;

 			shm = reg_pair_to_ptr(res.a1, res.a2);
 			tee_shm_free(shm);
 		} else
 			optee_cq_wait_for_completion(&optee->call_queue, &w);
 	}
 	optee_cq_wait_final(&optee->call_queue, &w);
 }
	/*
	* Copyright (c) 2015, 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.
	*
	*/
	#include <linux/types.h>
	#include <linux/err.h>
	#include <linux/errno.h>
	#include <linux/slab.h>
	#include <linux/uaccess.h>
	#include <linux/device.h>
	#include <linux/tee_drv.h>
	#include <linux/arm-smccc.h>
	#include "optee_private.h"
	#include "optee_smc.h"

	struct optee_call_waiter {
	struct list_head list_node;
	struct completion c;
	bool completed;
	};

	static void optee_cq_wait_init(struct optee_call_queue *cq,
	struct optee_call_waiter *w)
	{
	mutex_lock(&cq->mutex);
	/*
	* We add ourselves to the queue, but we don't wait. This
	* guarentees that we don't lose a completion if secure world
	* returns busy and another thread just exited and try to complete
	* someone.
	*/
	w->completed = false;
	init_completion(&w->c);
	list_add_tail(&w->list_node, &cq->waiters);
	mutex_unlock(&cq->mutex);
	}

	static void optee_cq_wait_for_completion(struct optee_call_queue *cq,
	struct optee_call_waiter *w)
	{
	wait_for_completion(&w->c);

	mutex_lock(&cq->mutex);

	/* Move to end of list to get out of the way for other waiters */
	list_del(&w->list_node);
	w->completed = false;
	reinit_completion(&w->c);
	list_add_tail(&w->list_node, &cq->waiters);

	mutex_unlock(&cq->mutex);
	}

	static void optee_cq_complete_one(struct optee_call_queue *cq)
	{
	struct optee_call_waiter *w;

	list_for_each_entry(w, &cq->waiters, list_node) {
	if (!w->completed) {
	complete(&w->c);
	w->completed = true;
	break;
	}
	}
	}

	static void optee_cq_wait_final(struct optee_call_queue *cq,
	struct optee_call_waiter *w)
	{
	mutex_lock(&cq->mutex);

	/* Get out of the list */
	list_del(&w->list_node);

	optee_cq_complete_one(cq);
	/*
	* If we're completed we've got a completion that some other task
	* could have used instead.
	*/
	if (w->completed)
	optee_cq_complete_one(cq);

	mutex_unlock(&cq->mutex);
	}

	/* Requires the filpstate mutex to be held */
	static struct optee_session find_session(struct optee_context_data ctxdata,
	u32 session_id)
	{
	struct optee_session *sess;

	list_for_each_entry(sess, &ctxdata->sess_list, list_node)
	if (sess->session_id == session_id)
	return sess;
	return NULL;
	}

	u32 optee_do_call_with_arg(struct tee_context *ctx, phys_addr_t parg)
	{
	struct optee *optee = tee_get_drvdata(ctx->teedev);
	struct optee_call_waiter w;
	struct optee_rpc_param param = { };
	u32 ret;

	param.a0 = OPTEE_SMC_CALL_WITH_ARG;
	reg_pair_from_64(&param.a1, &param.a2, parg);
	/* Initialize waiter */
	optee_cq_wait_init(&optee->call_queue, &w);
	while (true) {
	struct arm_smccc_res res;

	optee->invoke_fn(param.a0, param.a1, param.a2, param.a3,
	param.a4, param.a5, param.a6, param.a7,
	&res);

	if (res.a0 == OPTEE_SMC_RETURN_ETHREAD_LIMIT) {
	/*
	* Out of threads in secure world, wait for a thread
	* become available.
	*/
	optee_cq_wait_for_completion(&optee->call_queue, &w);
	} else if (OPTEE_SMC_RETURN_IS_RPC(res.a0)) {
	param.a0 = res.a0;
	param.a1 = res.a1;
	param.a2 = res.a2;
	param.a3 = res.a3;
	optee_handle_rpc(ctx, &param);
	} else {
	ret = res.a0;
	break;
	}
	}
	/*
	* We're done with our thread in secure world, if there's any
	* thread waiters wake up one.
	*/
	optee_cq_wait_final(&optee->call_queue, &w);
	return ret;
	}

	static struct tee_shm get_msg_arg(struct tee_context ctx, size_t num_params,
	struct optee_msg_arg *msg_arg, phys_addr_t msg_parg)
	{
	int rc;
	struct tee_shm *shm;
	struct optee_msg_arg *ma;

	shm = tee_shm_alloc(ctx->teedev, OPTEE_MSG_GET_ARG_SIZE(num_params),
	TEE_SHM_MAPPED);
	if (IS_ERR(shm))
	return shm;
	ma = tee_shm_get_va(shm, 0);
	if (IS_ERR(ma)) {
	rc = PTR_ERR(ma);
	goto out;
	}
	rc = tee_shm_get_pa(shm, 0, msg_parg);
	if (rc)
	goto out;

	memset(ma, 0, OPTEE_MSG_GET_ARG_SIZE(num_params));
	ma->num_params = num_params;
	*msg_arg = ma;
	out:
	if (rc) {
	tee_shm_free(shm);
	return ERR_PTR(rc);
	}
	return shm;
	}

	int optee_open_session(struct tee_context *ctx,
	struct tee_ioctl_open_session_arg *arg,
	struct tee_param *param)
	{
	struct optee_context_data *ctxdata = ctx->data;
	int rc;
	struct tee_shm *shm;
	struct optee_msg_arg *msg_arg;
	phys_addr_t msg_parg;
	struct optee_msg_param *msg_param;
	struct optee_session *sess = NULL;

	/* +2 for the meta parameters added below */
	shm = get_msg_arg(ctx, arg->num_params + 2, &msg_arg, &msg_parg);
	if (IS_ERR(shm))
	return PTR_ERR(shm);

	msg_arg->cmd = OPTEE_MSG_CMD_OPEN_SESSION;
	msg_arg->cancel_id = arg->cancel_id;
	msg_param = OPTEE_MSG_GET_PARAMS(msg_arg);

	/*
	* Initialize and add the meta parameters needed when opening a
	* session.
	*/
	msg_param[0].attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT \|
	OPTEE_MSG_ATTR_META;
	msg_param[1].attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT \|
	OPTEE_MSG_ATTR_META;
	memcpy(&msg_param[0].u.value, arg->uuid, sizeof(arg->uuid));
	memcpy(&msg_param[1].u.value, arg->uuid, sizeof(arg->clnt_uuid));
	msg_param[1].u.value.c = arg->clnt_login;

	rc = optee_to_msg_param(msg_param + 2, arg->num_params, param);
	if (rc)
	goto out;

	sess = kzalloc(sizeof(struct optee_session), GFP_KERNEL);
	if (!sess) {
	rc = -ENOMEM;
	goto out;
	}

	if (optee_do_call_with_arg(ctx, msg_parg)) {
	msg_arg->ret = TEEC_ERROR_COMMUNICATION;
	msg_arg->ret_origin = TEEC_ORIGIN_COMMS;
	}

	if (msg_arg->ret == TEEC_SUCCESS) {
	/* A new session has been created, add it to the list. */
	sess->session_id = msg_arg->session;
	mutex_lock(&ctxdata->mutex);
	list_add(&sess->list_node, &ctxdata->sess_list);
	mutex_unlock(&ctxdata->mutex);
	sess = NULL;
	}

	if (optee_from_msg_param(param, arg->num_params, msg_param + 2)) {
	arg->ret = TEEC_ERROR_COMMUNICATION;
	arg->ret_origin = TEEC_ORIGIN_COMMS;
	/* Close session again to avoid leakage */
	optee_close_session(ctx, msg_arg->session);
	} else {
	arg->session = msg_arg->session;
	arg->ret = msg_arg->ret;
	arg->ret_origin = msg_arg->ret_origin;
	}
	out:
	kfree(sess);
	tee_shm_free(shm);
	return rc;
	}

	int optee_close_session(struct tee_context *ctx, u32 session)
	{
	struct optee_context_data *ctxdata = ctx->data;
	struct tee_shm *shm;
	struct optee_msg_arg *msg_arg;
	phys_addr_t msg_parg;
	struct optee_session *sess;

	/* Check that the session is valid and remove it from the list */
	mutex_lock(&ctxdata->mutex);
	sess = find_session(ctxdata, session);
	if (sess)
	list_del(&sess->list_node);
	mutex_unlock(&ctxdata->mutex);
	if (!sess)
	return -EINVAL;
	kfree(sess);

	shm = get_msg_arg(ctx, 0, &msg_arg, &msg_parg);
	if (IS_ERR(shm))
	return PTR_ERR(shm);

	msg_arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION;
	msg_arg->session = session;
	optee_do_call_with_arg(ctx, msg_parg);

	tee_shm_free(shm);
	return 0;
	}

	int optee_invoke_func(struct tee_context ctx, struct tee_ioctl_invoke_arg arg,
	struct tee_param *param)
	{
	struct optee_context_data *ctxdata = ctx->data;
	struct tee_shm *shm;
	struct optee_msg_arg *msg_arg;
	phys_addr_t msg_parg;
	struct optee_msg_param *msg_param;
	struct optee_session *sess;
	int rc;

	/* Check that the session is valid */
	mutex_lock(&ctxdata->mutex);
	sess = find_session(ctxdata, arg->session);
	mutex_unlock(&ctxdata->mutex);
	if (!sess)
	return -EINVAL;

	shm = get_msg_arg(ctx, arg->num_params, &msg_arg, &msg_parg);
	if (IS_ERR(shm))
	return PTR_ERR(shm);
	msg_arg->cmd = OPTEE_MSG_CMD_INVOKE_COMMAND;
	msg_arg->func = arg->func;
	msg_arg->session = arg->session;
	msg_arg->cancel_id = arg->cancel_id;
	msg_param = OPTEE_MSG_GET_PARAMS(msg_arg);

	rc = optee_to_msg_param(msg_param, arg->num_params, param);
	if (rc)
	goto out;

	if (optee_do_call_with_arg(ctx, msg_parg)) {
	msg_arg->ret = TEEC_ERROR_COMMUNICATION;
	msg_arg->ret_origin = TEEC_ORIGIN_COMMS;
	}

	if (optee_from_msg_param(param, arg->num_params, msg_param)) {
	msg_arg->ret = TEEC_ERROR_COMMUNICATION;
	msg_arg->ret_origin = TEEC_ORIGIN_COMMS;
	}

	arg->ret = msg_arg->ret;
	arg->ret_origin = msg_arg->ret_origin;
	out:
	tee_shm_free(shm);
	return rc;
	}

	int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session)
	{
	struct optee_context_data *ctxdata = ctx->data;
	struct tee_shm *shm;
	struct optee_msg_arg *msg_arg;
	phys_addr_t msg_parg;
	struct optee_session *sess;

	/* Check that the session is valid */
	mutex_lock(&ctxdata->mutex);
	sess = find_session(ctxdata, session);
	mutex_unlock(&ctxdata->mutex);
	if (!sess)
	return -EINVAL;

	shm = get_msg_arg(ctx, 0, &msg_arg, &msg_parg);
	if (IS_ERR(shm))
	return PTR_ERR(shm);

	msg_arg->cmd = OPTEE_MSG_CMD_CANCEL;
	msg_arg->session = session;
	msg_arg->cancel_id = cancel_id;
	optee_do_call_with_arg(ctx, msg_parg);

	tee_shm_free(shm);
	return 0;
	}

	void optee_enable_shm_cache(struct optee *optee)
	{
	struct optee_call_waiter w;

	/* We need to retry until secure world isn't busy. */
	optee_cq_wait_init(&optee->call_queue, &w);
	while (true) {
	struct arm_smccc_res res;

	optee->invoke_fn(OPTEE_SMC_ENABLE_SHM_CACHE, 0, 0, 0, 0, 0, 0,
	0, &res);
	if (res.a0 == OPTEE_SMC_RETURN_OK)
	break;
	optee_cq_wait_for_completion(&optee->call_queue, &w);
	}
	optee_cq_wait_final(&optee->call_queue, &w);
	}

	void optee_disable_shm_cache(struct optee *optee)
	{
	struct optee_call_waiter w;

	/* We need to retry until secure world isn't busy. */
	optee_cq_wait_init(&optee->call_queue, &w);
	while (true) {
	struct arm_smccc_res res;

	optee->invoke_fn(OPTEE_SMC_DISABLE_SHM_CACHE, 0, 0, 0, 0, 0, 0,
	0, &res);
	if (res.a0 == OPTEE_SMC_RETURN_ENOTAVAIL)
	break; /* All shm's freed */
	if (res.a0 == OPTEE_SMC_RETURN_OK) {
	struct tee_shm *shm;

	shm = reg_pair_to_ptr(res.a1, res.a2);
	tee_shm_free(shm);
	} else
	optee_cq_wait_for_completion(&optee->call_queue, &w);
	}
	optee_cq_wait_final(&optee->call_queue, &w);
	}