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// 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/tee_core.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)
{
int rc = 0;
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:
rc = optee_notif_wait(optee, arg->params[0].u.value.b, arg->params[0].u.value.c);
if (rc)
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:
if (rc == -ETIMEDOUT)
arg->ret = TEE_ERROR_TIMEOUT;
else
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, ¶m);
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, ¶m);
}
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;
default:
handle_rpc_supp_cmd(ctx, optee, arg);
}
}
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