1 /*
2 * Internal Header for the Direct Rendering Manager
3 *
4 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
5 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
6 * Copyright (c) 2009-2010, Code Aurora Forum.
7 * All rights reserved.
8 *
9 * Author: Rickard E. (Rik) Faith <faith@valinux.com>
10 * Author: Gareth Hughes <gareth@valinux.com>
11 *
12 * Permission is hereby granted, free of charge, to any person obtaining a
13 * copy of this software and associated documentation files (the "Software"),
14 * to deal in the Software without restriction, including without limitation
15 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
16 * and/or sell copies of the Software, and to permit persons to whom the
17 * Software is furnished to do so, subject to the following conditions:
18 *
19 * The above copyright notice and this permission notice (including the next
20 * paragraph) shall be included in all copies or substantial portions of the
21 * Software.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
24 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
25 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
26 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
27 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
28 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
29 * OTHER DEALINGS IN THE SOFTWARE.
30 */
31
32 #ifndef _DRM_IOCTL_H_
33 #define _DRM_IOCTL_H_
34
35 #include <linux/types.h>
36 #include <linux/bitops.h>
37
38 #include <asm/ioctl.h>
39
40 struct drm_device;
41 struct drm_file;
42 struct file;
43
44 /**
45 * drm_ioctl_t - DRM ioctl function type.
46 * @dev: DRM device inode
47 * @data: private pointer of the ioctl call
48 * @file_priv: DRM file this ioctl was made on
49 *
50 * This is the DRM ioctl typedef. Note that drm_ioctl() has alrady copied @data
51 * into kernel-space, and will also copy it back, depending upon the read/write
52 * settings in the ioctl command code.
53 */
54 typedef int drm_ioctl_t(struct drm_device *dev, void *data,
55 struct drm_file *file_priv);
56
57 /**
58 * drm_ioctl_compat_t - compatibility DRM ioctl function type.
59 * @filp: file pointer
60 * @cmd: ioctl command code
61 * @arg: DRM file this ioctl was made on
62 *
63 * Just a typedef to make declaring an array of compatibility handlers easier.
64 * New drivers shouldn't screw up the structure layout for their ioctl
65 * structures and hence never need this.
66 */
67 typedef int drm_ioctl_compat_t(struct file *filp, unsigned int cmd,
68 unsigned long arg);
69
70 #define DRM_IOCTL_NR(n) _IOC_NR(n)
71 #define DRM_MAJOR 226
72
73 /**
74 * enum drm_ioctl_flags - DRM ioctl flags
75 *
76 * Various flags that can be set in &drm_ioctl_desc.flags to control how
77 * userspace can use a given ioctl.
78 */
79 enum drm_ioctl_flags {
80 /**
81 * @DRM_AUTH:
82 *
83 * This is for ioctl which are used for rendering, and require that the
84 * file descriptor is either for a render node, or if it's a
85 * legacy/primary node, then it must be authenticated.
86 */
87 DRM_AUTH = BIT(0),
88 /**
89 * @DRM_MASTER:
90 *
91 * This must be set for any ioctl which can change the modeset or
92 * display state. Userspace must call the ioctl through a primary node,
93 * while it is the active master.
94 *
95 * Note that read-only modeset ioctl can also be called by
96 * unauthenticated clients, or when a master is not the currently active
97 * one.
98 */
99 DRM_MASTER = BIT(1),
100 /**
101 * @DRM_ROOT_ONLY:
102 *
103 * Anything that could potentially wreak a master file descriptor needs
104 * to have this flag set. Current that's only for the SETMASTER and
105 * DROPMASTER ioctl, which e.g. logind can call to force a non-behaving
106 * master (display compositor) into compliance.
107 *
108 * This is equivalent to callers with the SYSADMIN capability.
109 */
110 DRM_ROOT_ONLY = BIT(2),
111 /**
112 * @DRM_UNLOCKED:
113 *
114 * Whether &drm_ioctl_desc.func should be called with the DRM BKL held
115 * or not. Enforced as the default for all modern drivers, hence there
116 * should never be a need to set this flag.
117 *
118 * Do not use anywhere else than for the VBLANK_WAIT IOCTL, which is the
119 * only legacy IOCTL which needs this.
120 */
121 DRM_UNLOCKED = BIT(4),
122 /**
123 * @DRM_RENDER_ALLOW:
124 *
125 * This is used for all ioctl needed for rendering only, for drivers
126 * which support render nodes. This should be all new render drivers,
127 * and hence it should be always set for any ioctl with DRM_AUTH set.
128 * Note though that read-only query ioctl might have this set, but have
129 * not set DRM_AUTH because they do not require authentication.
130 */
131 DRM_RENDER_ALLOW = BIT(5),
132 };
133
134 /**
135 * struct drm_ioctl_desc - DRM driver ioctl entry
136 * @cmd: ioctl command number, without flags
137 * @flags: a bitmask of &enum drm_ioctl_flags
138 * @func: handler for this ioctl
139 * @name: user-readable name for debug output
140 *
141 * For convenience it's easier to create these using the DRM_IOCTL_DEF_DRV()
142 * macro.
143 */
144 struct drm_ioctl_desc {
145 unsigned int cmd;
146 enum drm_ioctl_flags flags;
147 drm_ioctl_t *func;
148 const char *name;
149 };
150
151 /**
152 * DRM_IOCTL_DEF_DRV() - helper macro to fill out a &struct drm_ioctl_desc
153 * @ioctl: ioctl command suffix
154 * @_func: handler for the ioctl
155 * @_flags: a bitmask of &enum drm_ioctl_flags
156 *
157 * Small helper macro to create a &struct drm_ioctl_desc entry. The ioctl
158 * command number is constructed by prepending ``DRM_IOCTL\_`` and passing that
159 * to DRM_IOCTL_NR().
160 */
161 #define DRM_IOCTL_DEF_DRV(ioctl, _func, _flags) \
162 [DRM_IOCTL_NR(DRM_IOCTL_##ioctl) - DRM_COMMAND_BASE] = { \
163 .cmd = DRM_IOCTL_##ioctl, \
164 .func = _func, \
165 .flags = _flags, \
166 .name = #ioctl \
167 }
168
169 int drm_ioctl_permit(u32 flags, struct drm_file *file_priv);
170 long drm_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
171 long drm_ioctl_kernel(struct file *, drm_ioctl_t, void *, u32);
172 #ifdef CONFIG_COMPAT
173 long drm_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
174 #else
175 /* Let drm_compat_ioctl be assigned to .compat_ioctl unconditionally */
176 #define drm_compat_ioctl NULL
177 #endif
178 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags);
179
180 int drm_noop(struct drm_device *dev, void *data,
181 struct drm_file *file_priv);
182 int drm_invalid_op(struct drm_device *dev, void *data,
183 struct drm_file *file_priv);
184
185 #endif /* _DRM_IOCTL_H_ */