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 struct tee_device;
  25
  26 /**
  27  * struct tee_shm - shared memory object
  28  * @teedev:     device used to allocate the object
  29  * @ctx:        context using the object, if NULL the context is gone
  30  * @link        link element
  31  * @paddr:      physical address of the shared memory
  32  * @kaddr:      virtual address of the shared memory
  33  * @size:       size of shared memory
  34  * @dmabuf:     dmabuf used to for exporting to user space
  35  * @flags:      defined by TEE_SHM_* in tee_drv.h
  36  * @id:         unique id of a shared memory object on this device
  37  */
  38 struct tee_shm {
  39         struct tee_device *teedev;
  40         struct tee_context *ctx;
  41         struct list_head link;
  42         phys_addr_t paddr;
  43         void *kaddr;
  44         size_t size;
  45         struct dma_buf *dmabuf;
  46         u32 flags;
  47         int id;
  48 };
  49
  50 struct tee_shm_pool_mgr;
  51
  52 /**
  53  * struct tee_shm_pool_mgr_ops - shared memory pool manager operations
  54  * @alloc:      called when allocating shared memory
  55  * @free:       called when freeing shared memory
  56  */
  57 struct tee_shm_pool_mgr_ops {
  58         int (*alloc)(struct tee_shm_pool_mgr *poolmgr, struct tee_shm *shm,
  59                      size_t size);
  60         void (*free)(struct tee_shm_pool_mgr *poolmgr, struct tee_shm *shm);
  61 };
  62
  63 /**
  64  * struct tee_shm_pool_mgr - shared memory manager
  65  * @ops:                operations
  66  * @private_data:       private data for the shared memory manager
  67  */
  68 struct tee_shm_pool_mgr {
  69         const struct tee_shm_pool_mgr_ops *ops;
  70         void *private_data;
  71 };
  72
  73 /**
  74  * struct tee_shm_pool - shared memory pool
  75  * @private_mgr:        pool manager for shared memory only between kernel
  76  *                      and secure world
  77  * @dma_buf_mgr:        pool manager for shared memory exported to user space
  78  * @destroy:            called when destroying the pool
  79  * @private_data:       private data for the pool
  80  */
  81 struct tee_shm_pool {
  82         struct tee_shm_pool_mgr private_mgr;
  83         struct tee_shm_pool_mgr dma_buf_mgr;
  84         void (*destroy)(struct tee_shm_pool *pool);
  85         void *private_data;
  86 };
  87
  88 #define TEE_DEVICE_FLAG_REGISTERED      0x1
  89 #define TEE_MAX_DEV_NAME_LEN            32
  90
  91 /**
  92  * struct tee_device - TEE Device representation
  93  * @name:       name of device
  94  * @desc:       description of device
  95  * @id:         unique id of device
  96  * @flags:      represented by TEE_DEVICE_FLAG_REGISTERED above
  97  * @dev:        embedded basic device structure
  98  * @cdev:       embedded cdev
  99  * @num_users:  number of active users of this device
 100  * @c_no_user:  completion used when unregistering the device
 101  * @mutex:      mutex protecting @num_users and @idr
 102  * @idr:        register of shared memory object allocated on this device
 103  * @pool:       shared memory pool
 104  */
 105 struct tee_device {
 106         char name[TEE_MAX_DEV_NAME_LEN];
 107         const struct tee_desc *desc;
 108         int id;
 109         unsigned int flags;
 110
 111         struct device dev;
 112         struct cdev cdev;
 113
 114         size_t num_users;
 115         struct completion c_no_users;
 116         struct mutex mutex;     /* protects num_users and idr */
 117
 118         struct idr idr;
 119         struct tee_shm_pool *pool;
 120 };
 121
 122 int tee_shm_init(void);
 123
 124 int tee_shm_get_fd(struct tee_shm *shm);
 125
 126 bool tee_device_get(struct tee_device *teedev);
 127 void tee_device_put(struct tee_device *teedev);
 128
 129 #endif /*TEE_PRIVATE_H*/