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 #ifdef __linux__ 71 #define DRM_IOCTL_NR(n) _IOC_NR(n) 72 #define DRM_IOCTL_TYPE(n) _IOC_TYPE(n) 73 #define DRM_MAJOR 226 74 #else 75 #define DRM_IOCTL_NR(n) ((n) & 0xff) 76 #define DRM_IOCTL_TYPE(n) IOCGROUP(n) 77 #endif 78 79 /** 80 * enum drm_ioctl_flags - DRM ioctl flags 81 * 82 * Various flags that can be set in &drm_ioctl_desc.flags to control how 83 * userspace can use a given ioctl. 84 */ 85 enum drm_ioctl_flags { 86 /** 87 * @DRM_AUTH: 88 * 89 * This is for ioctl which are used for rendering, and require that the 90 * file descriptor is either for a render node, or if it's a 91 * legacy/primary node, then it must be authenticated. 92 */ 93 DRM_AUTH = BIT(0), 94 /** 95 * @DRM_MASTER: 96 * 97 * This must be set for any ioctl which can change the modeset or 98 * display state. Userspace must call the ioctl through a primary node, 99 * while it is the active master. 100 * 101 * Note that read-only modeset ioctl can also be called by 102 * unauthenticated clients, or when a master is not the currently active 103 * one. 104 */ 105 DRM_MASTER = BIT(1), 106 /** 107 * @DRM_ROOT_ONLY: 108 * 109 * Anything that could potentially wreak a master file descriptor needs 110 * to have this flag set. Current that's only for the SETMASTER and 111 * DROPMASTER ioctl, which e.g. logind can call to force a non-behaving 112 * master (display compositor) into compliance. 113 * 114 * This is equivalent to callers with the SYSADMIN capability. 115 */ 116 DRM_ROOT_ONLY = BIT(2), 117 /** 118 * @DRM_UNLOCKED: 119 * 120 * Whether &drm_ioctl_desc.func should be called with the DRM BKL held 121 * or not. Enforced as the default for all modern drivers, hence there 122 * should never be a need to set this flag. 123 * 124 * Do not use anywhere else than for the VBLANK_WAIT IOCTL, which is the 125 * only legacy IOCTL which needs this. 126 */ 127 DRM_UNLOCKED = BIT(4), 128 /** 129 * @DRM_RENDER_ALLOW: 130 * 131 * This is used for all ioctl needed for rendering only, for drivers 132 * which support render nodes. This should be all new render drivers, 133 * and hence it should be always set for any ioctl with DRM_AUTH set. 134 * Note though that read-only query ioctl might have this set, but have 135 * not set DRM_AUTH because they do not require authentication. 136 */ 137 DRM_RENDER_ALLOW = BIT(5), 138 }; 139 140 /** 141 * struct drm_ioctl_desc - DRM driver ioctl entry 142 * @cmd: ioctl command number, without flags 143 * @flags: a bitmask of &enum drm_ioctl_flags 144 * @func: handler for this ioctl 145 * @name: user-readable name for debug output 146 * 147 * For convenience it's easier to create these using the DRM_IOCTL_DEF_DRV() 148 * macro. 149 */ 150 struct drm_ioctl_desc { 151 unsigned int cmd; 152 enum drm_ioctl_flags flags; 153 drm_ioctl_t *func; 154 const char *name; 155 }; 156 157 /** 158 * DRM_IOCTL_DEF_DRV() - helper macro to fill out a &struct drm_ioctl_desc 159 * @ioctl: ioctl command suffix 160 * @_func: handler for the ioctl 161 * @_flags: a bitmask of &enum drm_ioctl_flags 162 * 163 * Small helper macro to create a &struct drm_ioctl_desc entry. The ioctl 164 * command number is constructed by prepending ``DRM_IOCTL\_`` and passing that 165 * to DRM_IOCTL_NR(). 166 */ 167 #define DRM_IOCTL_DEF_DRV(ioctl, _func, _flags) \ 168 [DRM_IOCTL_NR(DRM_IOCTL_##ioctl) - DRM_COMMAND_BASE] = { \ 169 .cmd = DRM_IOCTL_##ioctl, \ 170 .func = _func, \ 171 .flags = _flags, \ 172 .name = #ioctl \ 173 } 174 175 long drm_ioctl(struct file *filp, unsigned int cmd, unsigned long arg); 176 long drm_ioctl_kernel(struct file *, drm_ioctl_t, void *, u32); 177 #ifdef CONFIG_COMPAT 178 long drm_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg); 179 #else 180 /* Let drm_compat_ioctl be assigned to .compat_ioctl unconditionally */ 181 #define drm_compat_ioctl NULL 182 #endif 183 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags); 184 185 int drm_noop(struct drm_device *dev, void *data, 186 struct drm_file *file_priv); 187 int drm_invalid_op(struct drm_device *dev, void *data, 188 struct drm_file *file_priv); 189 190 #endif /* _DRM_IOCTL_H_ */ 191