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/*
* Copyright (c) 2015-2016, Linaro Limited
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#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_device;
/**
* struct tee_shm - shared memory object
* @teedev: device used to allocate the object
* @ctx: context using the object, if NULL the context is gone
* @link link element
* @paddr: physical address of the shared memory
* @kaddr: virtual address of the shared memory
* @size: size of shared memory
* @dmabuf: dmabuf used to for exporting to user space
* @flags: defined by TEE_SHM_* in tee_drv.h
* @id: unique id of a shared memory object on this device
*/
struct tee_shm {
struct tee_device *teedev;
struct tee_context *ctx;
struct list_head link;
phys_addr_t paddr;
void *kaddr;
size_t size;
struct dma_buf *dmabuf;
u32 flags;
int id;
};
struct tee_shm_pool_mgr;
/**
* struct tee_shm_pool_mgr_ops - shared memory pool manager operations
* @alloc: called when allocating shared memory
* @free: called when freeing shared memory
*/
struct tee_shm_pool_mgr_ops {
int (*alloc)(struct tee_shm_pool_mgr *poolmgr, struct tee_shm *shm,
size_t size);
void (*free)(struct tee_shm_pool_mgr *poolmgr, struct tee_shm *shm);
};
/**
* struct tee_shm_pool_mgr - shared memory manager
* @ops: operations
* @private_data: private data for the shared memory manager
*/
struct tee_shm_pool_mgr {
const struct tee_shm_pool_mgr_ops *ops;
void *private_data;
};
/**
* 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
* @destroy: called when destroying the pool
* @private_data: private data for the pool
*/
struct tee_shm_pool {
struct tee_shm_pool_mgr private_mgr;
struct tee_shm_pool_mgr dma_buf_mgr;
void (*destroy)(struct tee_shm_pool *pool);
void *private_data;
};
#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 shared memory object allocated 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);
#endif /*TEE_PRIVATE_H*/
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