include/drm/drm_auth.h

   1 /*
   2  * Internal Header for the Direct Rendering Manager
   3  *
   4  * Copyright 2016 Intel Corporation
   5  *
   6  * Author: Daniel Vetter <daniel.vetter@ffwll.ch>
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the next
  16  * paragraph) shall be included in all copies or substantial portions of the
  17  * Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  23  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  24  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  25  * OTHER DEALINGS IN THE SOFTWARE.
  26  */
  27
  28 #ifndef _DRM_AUTH_H_
  29 #define _DRM_AUTH_H_
  30
  31 /*
  32  * Legacy DRI1 locking data structure. Only here instead of in drm_legacy.h for
  33  * include ordering reasons.
  34  *
  35  * DO NOT USE.
  36  */
  37 struct drm_lock_data {
  38         struct drm_hw_lock *hw_lock;
  39         struct drm_file *file_priv;
  40         wait_queue_head_t lock_queue;
  41         unsigned long lock_time;
  42         spinlock_t spinlock;
  43         uint32_t kernel_waiters;
  44         uint32_t user_waiters;
  45         int idle_has_lock;
  46 };
  47
  48 /**
  49  * struct drm_master - drm master structure
  50  *
  51  * @refcount: Refcount for this master object.
  52  * @dev: Link back to the DRM device
  53  * @lock: DRI1 lock information.
  54  * @driver_priv: Pointer to driver-private information.
  55  * @lessor: Lease holder
  56  * @lessee_id: id for lessees. Owners always have id 0
  57  * @lessee_list: other lessees of the same master
  58  * @lessees: drm_masters leasing from this one
  59  * @leases: Objects leased to this drm_master.
  60  * @lessee_idr: All lessees under this owner (only used where lessor == NULL)
  61  *
  62  * Note that master structures are only relevant for the legacy/primary device
  63  * nodes, hence there can only be one per device, not one per drm_minor.
  64  */
  65 struct drm_master {
  66         struct kref refcount;
  67         struct drm_device *dev;
  68         /**
  69          * @unique: Unique identifier: e.g. busid. Protected by
  70          * &drm_device.master_mutex.
  71          */
  72         char *unique;
  73         /**
  74          * @unique_len: Length of unique field. Protected by
  75          * &drm_device.master_mutex.
  76          */
  77         int unique_len;
  78         /**
  79          * @magic_map: Map of used authentication tokens. Protected by
  80          * &drm_device.master_mutex.
  81          */
  82         struct idr magic_map;
  83         struct drm_lock_data lock;
  84         void *driver_priv;
  85
  86         /* Tree of display resource leases, each of which is a drm_master struct
  87          * All of these get activated simultaneously, so drm_device master points
  88          * at the top of the tree (for which lessor is NULL). Protected by
  89          * &drm_device.mode_config.idr_mutex.
  90          */
  91
  92         struct drm_master *lessor;
  93         int     lessee_id;
  94         struct list_head lessee_list;
  95         struct list_head lessees;
  96         struct idr leases;
  97         struct idr lessee_idr;
  98 };
  99
 100 struct drm_master *drm_master_get(struct drm_master *master);
 101 void drm_master_put(struct drm_master **master);
 102 bool drm_is_current_master(struct drm_file *fpriv);
 103
 104 struct drm_master *drm_master_create(struct drm_device *dev);
 105
 106 #endif