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  *
  56  * Note that master structures are only relevant for the legacy/primary device
  57  * nodes, hence there can only be one per device, not one per drm_minor.
  58  */
  59 struct drm_master {
  60         struct kref refcount;
  61         struct drm_device *dev;
  62         /**
  63          * @unique: Unique identifier: e.g. busid. Protected by
  64          * &drm_device.master_mutex.
  65          */
  66         char *unique;
  67         /**
  68          * @unique_len: Length of unique field. Protected by
  69          * &drm_device.master_mutex.
  70          */
  71         int unique_len;
  72         /**
  73          * @magic_map: Map of used authentication tokens. Protected by
  74          * &drm_device.master_mutex.
  75          */
  76         struct idr magic_map;
  77         struct drm_lock_data lock;
  78         void *driver_priv;
  79 };
  80
  81 struct drm_master *drm_master_get(struct drm_master *master);
  82 void drm_master_put(struct drm_master **master);
  83 bool drm_is_current_master(struct drm_file *fpriv);
  84
  85 #endif