Current File : //proc/self/root/usr/src/linux-headers-5.15.0-125/include/drm/drm_ioctl.h
/*
* Internal Header for the Direct Rendering Manager
*
* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
* Copyright (c) 2009-2010, Code Aurora Forum.
* All rights reserved.
*
* Author: Rickard E. (Rik) Faith <faith@valinux.com>
* Author: Gareth Hughes <gareth@valinux.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef _DRM_IOCTL_H_
#define _DRM_IOCTL_H_
#include <linux/types.h>
#include <linux/bitops.h>
#include <asm/ioctl.h>
struct drm_device;
struct drm_file;
struct file;
/**
* drm_ioctl_t - DRM ioctl function type.
* @dev: DRM device inode
* @data: private pointer of the ioctl call
* @file_priv: DRM file this ioctl was made on
*
* This is the DRM ioctl typedef. Note that drm_ioctl() has alrady copied @data
* into kernel-space, and will also copy it back, depending upon the read/write
* settings in the ioctl command code.
*/
typedef int drm_ioctl_t(struct drm_device *dev, void *data,
struct drm_file *file_priv);
/**
* drm_ioctl_compat_t - compatibility DRM ioctl function type.
* @filp: file pointer
* @cmd: ioctl command code
* @arg: DRM file this ioctl was made on
*
* Just a typedef to make declaring an array of compatibility handlers easier.
* New drivers shouldn't screw up the structure layout for their ioctl
* structures and hence never need this.
*/
typedef int drm_ioctl_compat_t(struct file *filp, unsigned int cmd,
unsigned long arg);
#define DRM_IOCTL_NR(n) _IOC_NR(n)
#define DRM_IOCTL_TYPE(n) _IOC_TYPE(n)
#define DRM_MAJOR 226
/**
* enum drm_ioctl_flags - DRM ioctl flags
*
* Various flags that can be set in &drm_ioctl_desc.flags to control how
* userspace can use a given ioctl.
*/
enum drm_ioctl_flags {
/**
* @DRM_AUTH:
*
* This is for ioctl which are used for rendering, and require that the
* file descriptor is either for a render node, or if it's a
* legacy/primary node, then it must be authenticated.
*/
DRM_AUTH = BIT(0),
/**
* @DRM_MASTER:
*
* This must be set for any ioctl which can change the modeset or
* display state. Userspace must call the ioctl through a primary node,
* while it is the active master.
*
* Note that read-only modeset ioctl can also be called by
* unauthenticated clients, or when a master is not the currently active
* one.
*/
DRM_MASTER = BIT(1),
/**
* @DRM_ROOT_ONLY:
*
* Anything that could potentially wreak a master file descriptor needs
* to have this flag set. Current that's only for the SETMASTER and
* DROPMASTER ioctl, which e.g. logind can call to force a non-behaving
* master (display compositor) into compliance.
*
* This is equivalent to callers with the SYSADMIN capability.
*/
DRM_ROOT_ONLY = BIT(2),
/**
* @DRM_UNLOCKED:
*
* Whether &drm_ioctl_desc.func should be called with the DRM BKL held
* or not. Enforced as the default for all modern drivers, hence there
* should never be a need to set this flag.
*
* Do not use anywhere else than for the VBLANK_WAIT IOCTL, which is the
* only legacy IOCTL which needs this.
*/
DRM_UNLOCKED = BIT(4),
/**
* @DRM_RENDER_ALLOW:
*
* This is used for all ioctl needed for rendering only, for drivers
* which support render nodes. This should be all new render drivers,
* and hence it should be always set for any ioctl with DRM_AUTH set.
* Note though that read-only query ioctl might have this set, but have
* not set DRM_AUTH because they do not require authentication.
*/
DRM_RENDER_ALLOW = BIT(5),
};
/**
* struct drm_ioctl_desc - DRM driver ioctl entry
* @cmd: ioctl command number, without flags
* @flags: a bitmask of &enum drm_ioctl_flags
* @func: handler for this ioctl
* @name: user-readable name for debug output
*
* For convenience it's easier to create these using the DRM_IOCTL_DEF_DRV()
* macro.
*/
struct drm_ioctl_desc {
unsigned int cmd;
enum drm_ioctl_flags flags;
drm_ioctl_t *func;
const char *name;
};
/**
* DRM_IOCTL_DEF_DRV() - helper macro to fill out a &struct drm_ioctl_desc
* @ioctl: ioctl command suffix
* @_func: handler for the ioctl
* @_flags: a bitmask of &enum drm_ioctl_flags
*
* Small helper macro to create a &struct drm_ioctl_desc entry. The ioctl
* command number is constructed by prepending ``DRM_IOCTL\_`` and passing that
* to DRM_IOCTL_NR().
*/
#define DRM_IOCTL_DEF_DRV(ioctl, _func, _flags) \
[DRM_IOCTL_NR(DRM_IOCTL_##ioctl) - DRM_COMMAND_BASE] = { \
.cmd = DRM_IOCTL_##ioctl, \
.func = _func, \
.flags = _flags, \
.name = #ioctl \
}
int drm_ioctl_permit(u32 flags, struct drm_file *file_priv);
long drm_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
long drm_ioctl_kernel(struct file *, drm_ioctl_t, void *, u32);
#ifdef CONFIG_COMPAT
long drm_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
#else
/* Let drm_compat_ioctl be assigned to .compat_ioctl unconditionally */
#define drm_compat_ioctl NULL
#endif
bool drm_ioctl_flags(unsigned int nr, unsigned int *flags);
int drm_noop(struct drm_device *dev, void *data,
struct drm_file *file_priv);
int drm_invalid_op(struct drm_device *dev, void *data,
struct drm_file *file_priv);
#endif /* _DRM_IOCTL_H_ */
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