linux/drivers/tee/tee_private.h
Jens Wiklander f1bbacedb0 tee: don't assign shm id for private shms
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>
2020-02-28 13:37:42 +01:00

72 lines
1.8 KiB
C

/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) 2015-2016, Linaro Limited
*/
#ifndef TEE_PRIVATE_H
#define TEE_PRIVATE_H
#include <linux/cdev.h>
#include <linux/completion.h>
#include <linux/device.h>
#include <linux/kref.h>
#include <linux/mutex.h>
#include <linux/types.h>
/**
* struct tee_shm_pool - shared memory pool
* @private_mgr: pool manager for shared memory only between kernel
* and secure world
* @dma_buf_mgr: pool manager for shared memory exported to user space
*/
struct tee_shm_pool {
struct tee_shm_pool_mgr *private_mgr;
struct tee_shm_pool_mgr *dma_buf_mgr;
};
#define TEE_DEVICE_FLAG_REGISTERED 0x1
#define TEE_MAX_DEV_NAME_LEN 32
/**
* struct tee_device - TEE Device representation
* @name: name of device
* @desc: description of device
* @id: unique id of device
* @flags: represented by TEE_DEVICE_FLAG_REGISTERED above
* @dev: embedded basic device structure
* @cdev: embedded cdev
* @num_users: number of active users of this device
* @c_no_user: completion used when unregistering the device
* @mutex: mutex protecting @num_users and @idr
* @idr: register of user space shared memory objects allocated or
* registered on this device
* @pool: shared memory pool
*/
struct tee_device {
char name[TEE_MAX_DEV_NAME_LEN];
const struct tee_desc *desc;
int id;
unsigned int flags;
struct device dev;
struct cdev cdev;
size_t num_users;
struct completion c_no_users;
struct mutex mutex; /* protects num_users and idr */
struct idr idr;
struct tee_shm_pool *pool;
};
int tee_shm_init(void);
int tee_shm_get_fd(struct tee_shm *shm);
bool tee_device_get(struct tee_device *teedev);
void tee_device_put(struct tee_device *teedev);
void teedev_ctx_get(struct tee_context *ctx);
void teedev_ctx_put(struct tee_context *ctx);
#endif /*TEE_PRIVATE_H*/