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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 struct drm_master *drm_file_get_master(struct drm_file *file_priv);
111 void drm_master_put(struct drm_master **master);
112 bool drm_is_current_master(struct drm_file *fpriv);
113 
114 struct drm_master *drm_master_create(struct drm_device *dev);
115 
116 #endif
117