drivers/tee/tee_private.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (c) 2015-2016, Linaro Limited
   4  */
   5 #ifndef TEE_PRIVATE_H
   6 #define TEE_PRIVATE_H
   7
   8 #include <linux/cdev.h>
   9 #include <linux/completion.h>
  10 #include <linux/device.h>
  11 #include <linux/kref.h>
  12 #include <linux/mutex.h>
  13 #include <linux/types.h>
  14
  15 /**
  16  * struct tee_shm_pool - shared memory pool
  17  * @private_mgr:        pool manager for shared memory only between kernel
  18  *                      and secure world
  19  * @dma_buf_mgr:        pool manager for shared memory exported to user space
  20  */
  21 struct tee_shm_pool {
  22         struct tee_shm_pool_mgr *private_mgr;
  23         struct tee_shm_pool_mgr *dma_buf_mgr;
  24 };
  25
  26 #define TEE_DEVICE_FLAG_REGISTERED      0x1
  27 #define TEE_MAX_DEV_NAME_LEN            32
  28
  29 /**
  30  * struct tee_device - TEE Device representation
  31  * @name:       name of device
  32  * @desc:       description of device
  33  * @id:         unique id of device
  34  * @flags:      represented by TEE_DEVICE_FLAG_REGISTERED above
  35  * @dev:        embedded basic device structure
  36  * @cdev:       embedded cdev
  37  * @num_users:  number of active users of this device
  38  * @c_no_user:  completion used when unregistering the device
  39  * @mutex:      mutex protecting @num_users and @idr
  40  * @idr:        register of user space shared memory objects allocated or
  41  *              registered on this device
  42  * @pool:       shared memory pool
  43  */
  44 struct tee_device {
  45         char name[TEE_MAX_DEV_NAME_LEN];
  46         const struct tee_desc *desc;
  47         int id;
  48         unsigned int flags;
  49
  50         struct device dev;
  51         struct cdev cdev;
  52
  53         size_t num_users;
  54         struct completion c_no_users;
  55         struct mutex mutex;     /* protects num_users and idr */
  56
  57         struct idr idr;
  58         struct tee_shm_pool *pool;
  59 };
  60
  61 int tee_shm_init(void);
  62
  63 int tee_shm_get_fd(struct tee_shm *shm);
  64
  65 bool tee_device_get(struct tee_device *teedev);
  66 void tee_device_put(struct tee_device *teedev);
  67
  68 void teedev_ctx_get(struct tee_context *ctx);
  69 void teedev_ctx_put(struct tee_context *ctx);
  70
  71 #endif /*TEE_PRIVATE_H*/