1/* SPDX-License-Identifier: MIT */
2/* Copyright © 2025 Intel Corporation */
3
4#ifndef __DRM_INTEL_DISPLAY_H__
5#define __DRM_INTEL_DISPLAY_H__
6
7#include <linux/build_bug.h>
8#include <linux/stddef.h>
9#include <linux/stringify.h>
10
11#include <drm/drm_device.h>
12
13struct intel_display;
14
15/*
16 * A dummy device struct to define the relative offsets of drm and display
17 * members. With the members identically placed in struct drm_i915_private and
18 * struct xe_device, this allows figuring out the struct intel_display pointer
19 * without the definition of either driver specific structure.
20 */
21struct __intel_generic_device {
22 struct drm_device drm;
23 struct intel_display *display;
24};
25
26/**
27 * INTEL_DISPLAY_MEMBER_STATIC_ASSERT() - ensure correct placing of drm and display members
28 * @type: The struct to check
29 * @drm_member: Name of the struct drm_device member
30 * @display_member: Name of the struct intel_display * member.
31 *
32 * Use this static assert macro to ensure the struct drm_i915_private and struct
33 * xe_device struct drm_device and struct intel_display * members are at the
34 * same relative offsets.
35 */
36#define INTEL_DISPLAY_MEMBER_STATIC_ASSERT(type, drm_member, display_member) \
37 static_assert( \
38 offsetof(struct __intel_generic_device, display) - offsetof(struct __intel_generic_device, drm) == \
39 offsetof(type, display_member) - offsetof(type, drm_member), \
40 __stringify(type) " " __stringify(drm_member) " and " __stringify(display_member) " members at invalid offsets")
41
42#endif
43

source code of linux/include/drm/intel/display_member.h