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Private shared memory object must not be referenced from user space. To guarantee that, don't assign an id to shared memory objects which are driver private. Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2015-2016, Linaro Limited
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*/
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#ifndef TEE_PRIVATE_H
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#define TEE_PRIVATE_H
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#include <linux/cdev.h>
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#include <linux/completion.h>
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#include <linux/device.h>
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#include <linux/kref.h>
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#include <linux/mutex.h>
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#include <linux/types.h>
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/**
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* struct tee_shm_pool - shared memory pool
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* @private_mgr: pool manager for shared memory only between kernel
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* and secure world
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* @dma_buf_mgr: pool manager for shared memory exported to user space
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*/
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struct tee_shm_pool {
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struct tee_shm_pool_mgr *private_mgr;
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struct tee_shm_pool_mgr *dma_buf_mgr;
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};
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#define TEE_DEVICE_FLAG_REGISTERED 0x1
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#define TEE_MAX_DEV_NAME_LEN 32
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/**
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* struct tee_device - TEE Device representation
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* @name: name of device
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* @desc: description of device
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* @id: unique id of device
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* @flags: represented by TEE_DEVICE_FLAG_REGISTERED above
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* @dev: embedded basic device structure
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* @cdev: embedded cdev
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* @num_users: number of active users of this device
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* @c_no_user: completion used when unregistering the device
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* @mutex: mutex protecting @num_users and @idr
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* @idr: register of user space shared memory objects allocated or
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* registered on this device
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* @pool: shared memory pool
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*/
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struct tee_device {
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char name[TEE_MAX_DEV_NAME_LEN];
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const struct tee_desc *desc;
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int id;
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unsigned int flags;
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struct device dev;
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struct cdev cdev;
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size_t num_users;
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struct completion c_no_users;
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struct mutex mutex; /* protects num_users and idr */
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struct idr idr;
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struct tee_shm_pool *pool;
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};
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int tee_shm_init(void);
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int tee_shm_get_fd(struct tee_shm *shm);
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bool tee_device_get(struct tee_device *teedev);
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void tee_device_put(struct tee_device *teedev);
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void teedev_ctx_get(struct tee_context *ctx);
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void teedev_ctx_put(struct tee_context *ctx);
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#endif /*TEE_PRIVATE_H*/
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