280 lines
6.4 KiB
C
280 lines
6.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2015-2021, Linaro Limited
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/tee_drv.h>
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#include "optee_private.h"
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#include "optee_rpc_cmd.h"
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static void handle_rpc_func_cmd_get_time(struct optee_msg_arg *arg)
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{
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struct timespec64 ts;
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if (arg->num_params != 1)
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goto bad;
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if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
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OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT)
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goto bad;
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ktime_get_real_ts64(&ts);
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arg->params[0].u.value.a = ts.tv_sec;
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arg->params[0].u.value.b = ts.tv_nsec;
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arg->ret = TEEC_SUCCESS;
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return;
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bad:
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arg->ret = TEEC_ERROR_BAD_PARAMETERS;
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}
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#if IS_REACHABLE(CONFIG_I2C)
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static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx,
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struct optee_msg_arg *arg)
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{
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struct optee *optee = tee_get_drvdata(ctx->teedev);
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struct tee_param *params;
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struct i2c_adapter *adapter;
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struct i2c_msg msg = { };
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size_t i;
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int ret = -EOPNOTSUPP;
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u8 attr[] = {
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TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT,
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TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT,
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TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT,
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TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT,
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};
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if (arg->num_params != ARRAY_SIZE(attr)) {
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arg->ret = TEEC_ERROR_BAD_PARAMETERS;
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return;
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}
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params = kmalloc_array(arg->num_params, sizeof(struct tee_param),
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GFP_KERNEL);
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if (!params) {
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arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
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return;
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}
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if (optee->ops->from_msg_param(optee, params, arg->num_params,
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arg->params))
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goto bad;
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for (i = 0; i < arg->num_params; i++) {
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if (params[i].attr != attr[i])
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goto bad;
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}
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adapter = i2c_get_adapter(params[0].u.value.b);
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if (!adapter)
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goto bad;
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if (params[1].u.value.a & OPTEE_RPC_I2C_FLAGS_TEN_BIT) {
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if (!i2c_check_functionality(adapter,
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I2C_FUNC_10BIT_ADDR)) {
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i2c_put_adapter(adapter);
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goto bad;
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}
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msg.flags = I2C_M_TEN;
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}
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msg.addr = params[0].u.value.c;
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msg.buf = params[2].u.memref.shm->kaddr;
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msg.len = params[2].u.memref.size;
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switch (params[0].u.value.a) {
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case OPTEE_RPC_I2C_TRANSFER_RD:
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msg.flags |= I2C_M_RD;
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break;
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case OPTEE_RPC_I2C_TRANSFER_WR:
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break;
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default:
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i2c_put_adapter(adapter);
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goto bad;
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}
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ret = i2c_transfer(adapter, &msg, 1);
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if (ret < 0) {
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arg->ret = TEEC_ERROR_COMMUNICATION;
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} else {
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params[3].u.value.a = msg.len;
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if (optee->ops->to_msg_param(optee, arg->params,
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arg->num_params, params))
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arg->ret = TEEC_ERROR_BAD_PARAMETERS;
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else
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arg->ret = TEEC_SUCCESS;
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}
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i2c_put_adapter(adapter);
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kfree(params);
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return;
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bad:
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kfree(params);
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arg->ret = TEEC_ERROR_BAD_PARAMETERS;
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}
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#else
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static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx,
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struct optee_msg_arg *arg)
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{
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arg->ret = TEEC_ERROR_NOT_SUPPORTED;
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}
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#endif
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static void handle_rpc_func_cmd_wq(struct optee *optee,
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struct optee_msg_arg *arg)
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{
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if (arg->num_params != 1)
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goto bad;
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if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
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OPTEE_MSG_ATTR_TYPE_VALUE_INPUT)
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goto bad;
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switch (arg->params[0].u.value.a) {
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case OPTEE_RPC_NOTIFICATION_WAIT:
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if (optee_notif_wait(optee, arg->params[0].u.value.b))
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goto bad;
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break;
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case OPTEE_RPC_NOTIFICATION_SEND:
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if (optee_notif_send(optee, arg->params[0].u.value.b))
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goto bad;
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break;
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default:
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goto bad;
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}
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arg->ret = TEEC_SUCCESS;
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return;
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bad:
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arg->ret = TEEC_ERROR_BAD_PARAMETERS;
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}
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static void handle_rpc_func_cmd_wait(struct optee_msg_arg *arg)
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{
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u32 msec_to_wait;
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if (arg->num_params != 1)
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goto bad;
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if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
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OPTEE_MSG_ATTR_TYPE_VALUE_INPUT)
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goto bad;
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msec_to_wait = arg->params[0].u.value.a;
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/* Go to interruptible sleep */
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msleep_interruptible(msec_to_wait);
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arg->ret = TEEC_SUCCESS;
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return;
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bad:
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arg->ret = TEEC_ERROR_BAD_PARAMETERS;
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}
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static void handle_rpc_supp_cmd(struct tee_context *ctx, struct optee *optee,
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struct optee_msg_arg *arg)
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{
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struct tee_param *params;
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arg->ret_origin = TEEC_ORIGIN_COMMS;
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params = kmalloc_array(arg->num_params, sizeof(struct tee_param),
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GFP_KERNEL);
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if (!params) {
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arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
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return;
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}
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if (optee->ops->from_msg_param(optee, params, arg->num_params,
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arg->params)) {
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arg->ret = TEEC_ERROR_BAD_PARAMETERS;
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goto out;
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}
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arg->ret = optee_supp_thrd_req(ctx, arg->cmd, arg->num_params, params);
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if (optee->ops->to_msg_param(optee, arg->params, arg->num_params,
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params))
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arg->ret = TEEC_ERROR_BAD_PARAMETERS;
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out:
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kfree(params);
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}
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struct tee_shm *optee_rpc_cmd_alloc_suppl(struct tee_context *ctx, size_t sz)
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{
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u32 ret;
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struct tee_param param;
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struct optee *optee = tee_get_drvdata(ctx->teedev);
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struct tee_shm *shm;
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param.attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT;
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param.u.value.a = OPTEE_RPC_SHM_TYPE_APPL;
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param.u.value.b = sz;
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param.u.value.c = 0;
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ret = optee_supp_thrd_req(ctx, OPTEE_RPC_CMD_SHM_ALLOC, 1, ¶m);
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if (ret)
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return ERR_PTR(-ENOMEM);
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mutex_lock(&optee->supp.mutex);
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/* Increases count as secure world doesn't have a reference */
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shm = tee_shm_get_from_id(optee->supp.ctx, param.u.value.c);
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mutex_unlock(&optee->supp.mutex);
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return shm;
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}
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void optee_rpc_cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm)
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{
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struct tee_param param;
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param.attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT;
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param.u.value.a = OPTEE_RPC_SHM_TYPE_APPL;
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param.u.value.b = tee_shm_get_id(shm);
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param.u.value.c = 0;
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/*
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* Match the tee_shm_get_from_id() in cmd_alloc_suppl() as secure
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* world has released its reference.
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*
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* It's better to do this before sending the request to supplicant
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* as we'd like to let the process doing the initial allocation to
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* do release the last reference too in order to avoid stacking
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* many pending fput() on the client process. This could otherwise
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* happen if secure world does many allocate and free in a single
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* invoke.
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*/
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tee_shm_put(shm);
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optee_supp_thrd_req(ctx, OPTEE_RPC_CMD_SHM_FREE, 1, ¶m);
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}
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void optee_rpc_cmd(struct tee_context *ctx, struct optee *optee,
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struct optee_msg_arg *arg)
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{
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switch (arg->cmd) {
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case OPTEE_RPC_CMD_GET_TIME:
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handle_rpc_func_cmd_get_time(arg);
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break;
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case OPTEE_RPC_CMD_NOTIFICATION:
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handle_rpc_func_cmd_wq(optee, arg);
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break;
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case OPTEE_RPC_CMD_SUSPEND:
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handle_rpc_func_cmd_wait(arg);
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break;
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case OPTEE_RPC_CMD_I2C_TRANSFER:
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handle_rpc_func_cmd_i2c_transfer(ctx, arg);
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break;
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default:
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handle_rpc_supp_cmd(ctx, optee, arg);
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}
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}
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