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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 <[email protected]>
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
35struct drm_file;
36
37/**
38 * struct drm_master - drm master structure
39 *
40 * @refcount: Refcount for this master object.
41 * @dev: Link back to the DRM device
42 * @driver_priv: Pointer to driver-private information.
43 *
44 * Note that master structures are only relevant for the legacy/primary device
45 * nodes, hence there can only be one per device, not one per drm_minor.
46 */
47struct drm_master {
48 struct kref refcount;
49 struct drm_device *dev;
50 /**
51 * @unique: Unique identifier: e.g. busid. Protected by
52 * &drm_device.master_mutex.
53 */
54 char *unique;
55 /**
56 * @unique_len: Length of unique field. Protected by
57 * &drm_device.master_mutex.
58 */
59 int unique_len;
60 /**
61 * @magic_map: Map of used authentication tokens. Protected by
62 * &drm_device.master_mutex.
63 */
64 struct idr magic_map;
65 void *driver_priv;
66
67 /**
68 * @lessor:
69 *
70 * Lease grantor, only set if this &struct drm_master represents a
71 * lessee holding a lease of objects from @lessor. Full owners of the
72 * device have this set to NULL.
73 *
74 * The lessor does not change once it's set in drm_lease_create(), and
75 * each lessee holds a reference to its lessor that it releases upon
76 * being destroyed in drm_lease_destroy().
77 *
78 * See also the :ref:`section on display resource leasing
79 * <drm_leasing>`.
80 */
81 struct drm_master *lessor;
82
83 /**
84 * @lessee_id:
85 *
86 * ID for lessees. Owners (i.e. @lessor is NULL) always have ID 0.
87 * Protected by &drm_device.mode_config's &drm_mode_config.idr_mutex.
88 */
89 int lessee_id;
90
91 /**
92 * @lessee_list:
93 *
94 * List entry of lessees of @lessor, where they are linked to @lessees.
95 * Not used for owners. Protected by &drm_device.mode_config's
96 * &drm_mode_config.idr_mutex.
97 */
98 struct list_head lessee_list;
99
100 /**
101 * @lessees:
102 *
103 * List of drm_masters leasing from this one. Protected by
104 * &drm_device.mode_config's &drm_mode_config.idr_mutex.
105 *
106 * This list is empty if no leases have been granted, or if all lessees
107 * have been destroyed. Since lessors are referenced by all their
108 * lessees, this master cannot be destroyed unless the list is empty.
109 */
110 struct list_head lessees;
111
112 /**
113 * @leases:
114 *
115 * Objects leased to this drm_master. Protected by
116 * &drm_device.mode_config's &drm_mode_config.idr_mutex.
117 *
118 * Objects are leased all together in drm_lease_create(), and are
119 * removed all together when the lease is revoked.
120 */
121 struct idr leases;
122
123 /**
124 * @lessee_idr:
125 *
126 * All lessees under this owner (only used where @lessor is NULL).
127 * Protected by &drm_device.mode_config's &drm_mode_config.idr_mutex.
128 */
129 struct idr lessee_idr;
130};
131
132struct drm_master *drm_master_get(struct drm_master *master);
133struct drm_master *drm_file_get_master(struct drm_file *file_priv);
134void drm_master_put(struct drm_master **master);
135bool drm_is_current_master(struct drm_file *fpriv);
136
137struct drm_master *drm_master_create(struct drm_device *dev);
138
139#endif