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 * Legacy DRI1 locking data structure. Only here instead of in drm_legacy.h for
  33 * include ordering reasons.
  34 *
  35 * DO NOT USE.
  36 */
  37struct 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 * @driver_priv: Pointer to driver-private information.
  54 * @lessor: Lease holder
  55 * @lessee_id: id for lessees. Owners always have id 0
  56 * @lessee_list: other lessees of the same master
  57 * @lessees: drm_masters leasing from this one
  58 * @leases: Objects leased to this drm_master.
  59 * @lessee_idr: All lessees under this owner (only used where lessor == NULL)
  60 *
  61 * Note that master structures are only relevant for the legacy/primary device
  62 * nodes, hence there can only be one per device, not one per drm_minor.
  63 */
  64struct drm_master {
  65        struct kref refcount;
  66        struct drm_device *dev;
  67        /**
  68         * @unique: Unique identifier: e.g. busid. Protected by
  69         * &drm_device.master_mutex.
  70         */
  71        char *unique;
  72        /**
  73         * @unique_len: Length of unique field. Protected by
  74         * &drm_device.master_mutex.
  75         */
  76        int unique_len;
  77        /**
  78         * @magic_map: Map of used authentication tokens. Protected by
  79         * &drm_device.master_mutex.
  80         */
  81        struct idr magic_map;
  82        void *driver_priv;
  83
  84        /* Tree of display resource leases, each of which is a drm_master struct
  85         * All of these get activated simultaneously, so drm_device master points
  86         * at the top of the tree (for which lessor is NULL). Protected by
  87         * &drm_device.mode_config.idr_mutex.
  88         */
  89
  90        struct drm_master *lessor;
  91        int     lessee_id;
  92        struct list_head lessee_list;
  93        struct list_head lessees;
  94        struct idr leases;
  95        struct idr lessee_idr;
  96        /* private: */
  97#if IS_ENABLED(CONFIG_DRM_LEGACY)
  98        struct drm_lock_data lock;
  99#endif
 100};
 101
 102struct drm_master *drm_master_get(struct drm_master *master);
 103void drm_master_put(struct drm_master **master);
 104bool drm_is_current_master(struct drm_file *fpriv);
 105
 106struct drm_master *drm_master_create(struct drm_device *dev);
 107
 108#endif
 109