include/drm/drm_auth.h

   1 #ifndef _DRM_AUTH_H_
   2 #define _DRM_AUTH_H_
   3
   4 /*
   5  * Internal Header for the Direct Rendering Manager
   6  *
   7  * Copyright 2016 Intel Corporation
   8  *
   9  * Author: Daniel Vetter <daniel.vetter@ffwll.ch>
  10  *
  11  * Permission is hereby granted, free of charge, to any person obtaining a
  12  * copy of this software and associated documentation files (the "Software"),
  13  * to deal in the Software without restriction, including without limitation
  14  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  15  * and/or sell copies of the Software, and to permit persons to whom the
  16  * Software is furnished to do so, subject to the following conditions:
  17  *
  18  * The above copyright notice and this permission notice (including the next
  19  * paragraph) shall be included in all copies or substantial portions of the
  20  * Software.
  21  *
  22  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  23  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  25  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  26  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  27  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  28  * OTHER DEALINGS IN THE SOFTWARE.
  29  */
  30
  31 #include <linux/idr.h>
  32 #include <linux/kref.h>
  33 #include <linux/wait.h>
  34
  35 struct drm_file;
  36 struct drm_hw_lock;
  37
  38 /*
  39  * Legacy DRI1 locking data structure. Only here instead of in drm_legacy.h for
  40  * include ordering reasons.
  41  *
  42  * DO NOT USE.
  43  */
  44 struct drm_lock_data {
  45         struct drm_hw_lock *hw_lock;
  46         struct drm_file *file_priv;
  47         wait_queue_head_t lock_queue;
  48         unsigned long lock_time;
  49         spinlock_t spinlock;
  50         uint32_t kernel_waiters;
  51         uint32_t user_waiters;
  52         int idle_has_lock;
  53 };
  54
  55 /**
  56  * struct drm_master - drm master structure
  57  *
  58  * @refcount: Refcount for this master object.
  59  * @dev: Link back to the DRM device
  60  * @driver_priv: Pointer to driver-private information.
  61  * @lessor: Lease holder
  62  * @lessee_id: id for lessees. Owners always have id 0
  63  * @lessee_list: other lessees of the same master
  64  * @lessees: drm_masters leasing from this one
  65  * @leases: Objects leased to this drm_master.
  66  * @lessee_idr: All lessees under this owner (only used where lessor == NULL)
  67  *
  68  * Note that master structures are only relevant for the legacy/primary device
  69  * nodes, hence there can only be one per device, not one per drm_minor.
  70  */
  71 struct drm_master {
  72         struct kref refcount;
  73         struct drm_device *dev;
  74         /**
  75          * @unique: Unique identifier: e.g. busid. Protected by
  76          * &drm_device.master_mutex.
  77          */
  78         char *unique;
  79         /**
  80          * @unique_len: Length of unique field. Protected by
  81          * &drm_device.master_mutex.
  82          */
  83         int unique_len;
  84         /**
  85          * @magic_map: Map of used authentication tokens. Protected by
  86          * &drm_device.master_mutex.
  87          */
  88         struct idr magic_map;
  89         void *driver_priv;
  90
  91         /* Tree of display resource leases, each of which is a drm_master struct
  92          * All of these get activated simultaneously, so drm_device master points
  93          * at the top of the tree (for which lessor is NULL). Protected by
  94          * &drm_device.mode_config.idr_mutex.
  95          */
  96
  97         struct drm_master *lessor;
  98         int     lessee_id;
  99         struct list_head lessee_list;
 100         struct list_head lessees;
 101         struct idr leases;
 102         struct idr lessee_idr;
 103         /* private: */
 104 #if IS_ENABLED(CONFIG_DRM_LEGACY)
 105         struct drm_lock_data lock;
 106 #endif
 107 };
 108
 109 struct drm_master *drm_master_get(struct drm_master *master);
 110 void drm_master_put(struct drm_master **master);
 111 bool drm_is_current_master(struct drm_file *fpriv);
 112
 113 struct drm_master *drm_master_create(struct drm_device *dev);
 114
 115 #endif