LXR linux/include/drm/drm

   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 * struct drm_master - drm master structure
  33 *
  34 * @refcount: Refcount for this master object.
  35 * @dev: Link back to the DRM device
  36 * @lock: DRI1 lock information.
  37 * @driver_priv: Pointer to driver-private information.
  38 *
  39 * Note that master structures are only relevant for the legacy/primary device
  40 * nodes, hence there can only be one per device, not one per drm_minor.
  41 */
  42struct drm_master {
  43        struct kref refcount;
  44        struct drm_device *dev;
  45        /**
  46         * @unique: Unique identifier: e.g. busid. Protected by
  47         * &drm_device.master_mutex.
  48         */
  49        char *unique;
  50        /**
  51         * @unique_len: Length of unique field. Protected by
  52         * &drm_device.master_mutex.
  53         */
  54        int unique_len;
  55        /**
  56         * @magic_map: Map of used authentication tokens. Protected by
  57         * &drm_device.master_mutex.
  58         */
  59        struct idr magic_map;
  60        struct drm_lock_data lock;
  61        void *driver_priv;
  62};
  63
  64struct drm_master *drm_master_get(struct drm_master *master);
  65void drm_master_put(struct drm_master **master);
  66bool drm_is_current_master(struct drm_file *fpriv);
  67
  68#endif
  69