drivers/tee/tee_private.h

   1 /*
   2  * Copyright (c) 2015-2016, Linaro Limited
   3  *
   4  * This software is licensed under the terms of the GNU General Public
   5  * License version 2, as published by the Free Software Foundation, and
   6  * may be copied, distributed, and modified under those terms.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  */
  14 #ifndef TEE_PRIVATE_H
  15 #define TEE_PRIVATE_H
  16
  17 #include <linux/cdev.h>
  18 #include <linux/completion.h>
  19 #include <linux/device.h>
  20 #include <linux/kref.h>
  21 #include <linux/mutex.h>
  22 #include <linux/types.h>
  23
  24 /**
  25  * struct tee_shm_pool - shared memory pool
  26  * @private_mgr:        pool manager for shared memory only between kernel
  27  *                      and secure world
  28  * @dma_buf_mgr:        pool manager for shared memory exported to user space
  29  */
  30 struct tee_shm_pool {
  31         struct tee_shm_pool_mgr *private_mgr;
  32         struct tee_shm_pool_mgr *dma_buf_mgr;
  33 };
  34
  35 #define TEE_DEVICE_FLAG_REGISTERED      0x1
  36 #define TEE_MAX_DEV_NAME_LEN            32
  37
  38 /**
  39  * struct tee_device - TEE Device representation
  40  * @name:       name of device
  41  * @desc:       description of device
  42  * @id:         unique id of device
  43  * @flags:      represented by TEE_DEVICE_FLAG_REGISTERED above
  44  * @dev:        embedded basic device structure
  45  * @cdev:       embedded cdev
  46  * @num_users:  number of active users of this device
  47  * @c_no_user:  completion used when unregistering the device
  48  * @mutex:      mutex protecting @num_users and @idr
  49  * @idr:        register of shared memory object allocated on this device
  50  * @pool:       shared memory pool
  51  */
  52 struct tee_device {
  53         char name[TEE_MAX_DEV_NAME_LEN];
  54         const struct tee_desc *desc;
  55         int id;
  56         unsigned int flags;
  57
  58         struct device dev;
  59         struct cdev cdev;
  60
  61         size_t num_users;
  62         struct completion c_no_users;
  63         struct mutex mutex;     /* protects num_users and idr */
  64
  65         struct idr idr;
  66         struct tee_shm_pool *pool;
  67 };
  68
  69 int tee_shm_init(void);
  70
  71 int tee_shm_get_fd(struct tee_shm *shm);
  72
  73 bool tee_device_get(struct tee_device *teedev);
  74 void tee_device_put(struct tee_device *teedev);
  75
  76 void teedev_ctx_get(struct tee_context *ctx);
  77 void teedev_ctx_put(struct tee_context *ctx);
  78
  79 #endif /*TEE_PRIVATE_H*/