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279 lines
6.4 KiB
279 lines
6.4 KiB
// 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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