kernel_common_drivers/drivers/aml_tee/optee/rpc.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2015-2021, Linaro Limited
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/amlogic/tee_drv.h>
#include "optee_private.h"
#include "optee_rpc_cmd.h"

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;

	ktime_get_real_ts64(&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;
}

#if IS_REACHABLE(CONFIG_I2C)
static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx,
					     struct optee_msg_arg *arg)
{
	struct optee *optee = tee_get_drvdata(ctx->teedev);
	struct tee_param *params;
	struct i2c_adapter *adapter;
	struct i2c_msg msg = { };
	size_t i;
	int ret = -EOPNOTSUPP;
	u8 attr[] = {
		TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT,
		TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT,
		TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT,
		TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT,
	};

	if (arg->num_params != ARRAY_SIZE(attr)) {
		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
		return;
	}

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

	if (optee->ops->from_msg_param(optee, params, arg->num_params,
				       arg->params))
		goto bad;

	for (i = 0; i < arg->num_params; i++) {
		if (params[i].attr != attr[i])
			goto bad;
	}

	adapter = i2c_get_adapter(params[0].u.value.b);
	if (!adapter)
		goto bad;

	if (params[1].u.value.a & OPTEE_RPC_I2C_FLAGS_TEN_BIT) {
		if (!i2c_check_functionality(adapter,
					     I2C_FUNC_10BIT_ADDR)) {
			i2c_put_adapter(adapter);
			goto bad;
		}

		msg.flags = I2C_M_TEN;
	}

	msg.addr = params[0].u.value.c;
	msg.buf  = params[2].u.memref.shm->kaddr;
	msg.len  = params[2].u.memref.size;

	switch (params[0].u.value.a) {
	case OPTEE_RPC_I2C_TRANSFER_RD:
		msg.flags |= I2C_M_RD;
		break;
	case OPTEE_RPC_I2C_TRANSFER_WR:
		break;
	default:
		i2c_put_adapter(adapter);
		goto bad;
	}

	ret = i2c_transfer(adapter, &msg, 1);

	if (ret < 0) {
		arg->ret = TEEC_ERROR_COMMUNICATION;
	} else {
		params[3].u.value.a = msg.len;
		if (optee->ops->to_msg_param(optee, arg->params,
					     arg->num_params, params))
			arg->ret = TEEC_ERROR_BAD_PARAMETERS;
		else
			arg->ret = TEEC_SUCCESS;
	}

	i2c_put_adapter(adapter);
	kfree(params);
	return;
bad:
	kfree(params);
	arg->ret = TEEC_ERROR_BAD_PARAMETERS;
}
#else
static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx,
					     struct optee_msg_arg *arg)
{
	arg->ret = TEEC_ERROR_NOT_SUPPORTED;
}
#endif

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_RPC_NOTIFICATION_WAIT:
		if (optee_notif_wait(optee, arg->params[0].u.value.b))
			goto bad;
		break;
	case OPTEE_RPC_NOTIFICATION_SEND:
		if (optee_notif_send(optee, arg->params[0].u.value.b))
			goto bad;
		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;

	/* Go to interruptible sleep */
	msleep_interruptible(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 *optee,
				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->ops->from_msg_param(optee, 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->ops->to_msg_param(optee, arg->params, arg->num_params,
				     params))
		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
out:
	kfree(params);
}

struct tee_shm *optee_rpc_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_RPC_SHM_TYPE_APPL;
	param.u.value.b = sz;
	param.u.value.c = 0;

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

	mutex_lock(&optee->supp.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.mutex);
	return shm;
}

void optee_rpc_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_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_RPC_CMD_SHM_FREE, 1, &param);
}

#define TEE_SECURE_TIMER_FLAG_ONESHOT   0
#define TEE_SECURE_TIMER_FLAG_PERIOD    1
struct optee_timer_data {
	struct tee_context *ctx;
	u32 sess;
	u32 handle;
	u32 flags;
	u32 timeout;
	struct delayed_work work;
	struct list_head list_node;
	u32 delay_cancel;
	u32 working;
};

static void timer_work_task(struct work_struct *work)
{
	struct tee_ioctl_invoke_arg arg = { 0 };
	struct tee_param params[4] = { 0 };
	struct optee_timer_data *timer_data = container_of((struct delayed_work *)work,
			struct optee_timer_data, work);
	struct tee_context *ctx = timer_data->ctx;
	struct tee_device *teedev = ctx->teedev;
	struct optee *optee = NULL;
	struct optee_timer *timer = NULL;
	struct workqueue_struct *wq = NULL;
	int ret = 0;

	optee = tee_get_drvdata(teedev);
	if (!optee) {
		pr_err("Can't find teedev!\n");
		return;
	}

	timer = &optee->timer;
	wq = timer->wq;

	params[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;
	params[1].attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
	params[2].attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
	params[3].attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;

	params[0].u.value.a = timer_data->handle;

	arg.session = timer_data->sess;
	arg.num_params = 4;
	arg.func = 0xFFFFFFFE;
	mutex_lock(&timer->mutex);
	timer_data->working = 1;
	mutex_unlock(&timer->mutex);
	ret = optee_invoke_func(ctx, &arg, params);
	if (ret != 0)
		pr_err("%s: invoke cmd failed ret = 0x%x\n", __func__, ret);

	mutex_lock(&timer->mutex);
	if (timer_data->delay_cancel ||
			(!(timer_data->flags & TEE_SECURE_TIMER_FLAG_PERIOD))) {
		list_del(&timer_data->list_node);
		kfree(timer_data);
		mutex_unlock(&timer->mutex);
	} else {
		timer_data->working = 0;
		mutex_unlock(&timer->mutex);
		queue_delayed_work(wq, &timer_data->work,
				msecs_to_jiffies(timer_data->timeout));
	}
}

void optee_timer_init(struct optee_timer *timer)
{
	struct workqueue_struct *wq = NULL;

	mutex_init(&timer->mutex);
	INIT_LIST_HEAD(&timer->timer_list);

	wq = create_freezable_workqueue("tee_timer");
	if (!wq)
		return;
	timer->wq = wq;
}

void optee_timer_destroy(struct optee_timer *timer)
{
	struct optee_timer_data *timer_data = NULL;
	struct optee_timer_data *temp = NULL;

	mutex_lock(&timer->mutex);
	list_for_each_entry_safe(timer_data, temp, &timer->timer_list, list_node) {
		if (timer_data) {
			cancel_delayed_work_sync(&timer_data->work);
			list_del(&timer_data->list_node);
			kfree(timer_data);
		}
	}
	mutex_unlock(&timer->mutex);

	mutex_destroy(&timer->mutex);
	destroy_workqueue(timer->wq);
}

void optee_timer_missed_destroy(struct tee_context *ctx, u32 session)
{
	struct optee_timer_data *timer_data = NULL;
	struct optee_timer_data *temp = NULL;
	struct tee_device *teedev = ctx->teedev;
	struct optee *optee = tee_get_drvdata(teedev);
	struct optee_timer *timer = &optee->timer;

	mutex_lock(&timer->mutex);
	list_for_each_entry_safe(timer_data, temp, &timer->timer_list, list_node) {
		if (timer_data && timer_data->ctx == ctx && timer_data->sess == session) {
			if (timer_data->working) {
				timer_data->delay_cancel = 1;
				continue;
			}
			cancel_delayed_work_sync(&timer_data->work);
			list_del(&timer_data->list_node);
			kfree(timer_data);
		}
	}
	mutex_unlock(&timer->mutex);
}

static void handle_rpc_func_cmd_timer_create(struct tee_context *ctx,
					 struct optee_msg_arg *arg)
{
	struct optee_timer_data *timer_data;
	struct tee_device *teedev = ctx->teedev;
	struct optee *optee = tee_get_drvdata(teedev);
	struct optee_timer *timer = &optee->timer;
	struct workqueue_struct *wq = timer->wq;

	if (arg->num_params != 2 ||
	    arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT ||
	    arg->params[1].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
		return;
	}

	timer_data = kmalloc(sizeof(struct optee_timer_data), GFP_KERNEL);
	if (!timer_data) {
		arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
		return;
	}

	timer_data->ctx = ctx;
	timer_data->sess = arg->params[0].u.value.a;
	timer_data->handle = arg->params[0].u.value.b;
	timer_data->timeout = arg->params[1].u.value.a;
	timer_data->flags = arg->params[1].u.value.b;
	timer_data->delay_cancel = 0;
	timer_data->working = 0;
	INIT_DELAYED_WORK(&timer_data->work, timer_work_task);

	mutex_lock(&timer->mutex);
	list_add_tail(&timer_data->list_node, &timer->timer_list);
	mutex_unlock(&timer->mutex);

	queue_delayed_work(wq, &timer_data->work, msecs_to_jiffies(timer_data->timeout));

	arg->ret = TEEC_SUCCESS;
}

static void handle_rpc_func_cmd_timer_destroy(struct tee_context *ctx,
					 struct optee_msg_arg *arg)
{
	u32 handle;
	struct tee_device *teedev = ctx->teedev;
	struct optee *optee = tee_get_drvdata(teedev);
	struct optee_timer *timer = &optee->timer;
	struct optee_timer_data *timer_data;

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

	handle = arg->params[0].u.value.b;

	mutex_lock(&timer->mutex);
	list_for_each_entry(timer_data, &timer->timer_list, list_node) {
		if (timer_data->handle == handle) {
			if (timer_data->working) {
				timer_data->delay_cancel = 1;
				arg->ret = TEEC_SUCCESS;
				goto out;
			}
			cancel_delayed_work(&timer_data->work);
			list_del(&timer_data->list_node);
			kfree(timer_data);

			arg->ret = TEEC_SUCCESS;
			goto out;
		}
	}

	arg->ret = TEEC_ERROR_BAD_PARAMETERS;
out:
	mutex_unlock(&timer->mutex);
}

void optee_rpc_cmd(struct tee_context *ctx, struct optee *optee,
		   struct optee_msg_arg *arg)
{
	switch (arg->cmd) {
	case OPTEE_RPC_CMD_GET_TIME:
		handle_rpc_func_cmd_get_time(arg);
		break;
	case OPTEE_RPC_CMD_NOTIFICATION:
		handle_rpc_func_cmd_wq(optee, arg);
		break;
	case OPTEE_RPC_CMD_SUSPEND:
		handle_rpc_func_cmd_wait(arg);
		break;
	case OPTEE_RPC_CMD_I2C_TRANSFER:
		handle_rpc_func_cmd_i2c_transfer(ctx, arg);
		break;
	case OPTEE_RPC_CMD_TIMER_CREATE:
		handle_rpc_func_cmd_timer_create(ctx, arg);
		break;
	case OPTEE_RPC_CMD_TIMER_DESTROY:
		handle_rpc_func_cmd_timer_destroy(ctx, arg);
		break;
	default:
		handle_rpc_supp_cmd(ctx, optee, arg);
	}
}