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drm_gem_atomic_helper.h
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/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef __DRM_GEM_ATOMIC_HELPER_H__
#define __DRM_GEM_ATOMIC_HELPER_H__
#include <linux/iosys-map.h>
#include <drm/drm_format_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_plane.h>
struct drm_simple_display_pipe;
/*
* Plane Helpers
*/
int drm_gem_plane_helper_prepare_fb(struct drm_plane *plane, struct drm_plane_state *state);
/*
* Helpers for planes with shadow buffers
*/
/**
* DRM_SHADOW_PLANE_MAX_WIDTH - Maximum width of a plane's shadow buffer in pixels
*
* For drivers with shadow planes, the maximum width of the framebuffer is
* usually independent from hardware limitations. Drivers can initialize struct
* drm_mode_config.max_width from DRM_SHADOW_PLANE_MAX_WIDTH.
*/
#define DRM_SHADOW_PLANE_MAX_WIDTH (4096u)
/**
* DRM_SHADOW_PLANE_MAX_HEIGHT - Maximum height of a plane's shadow buffer in scanlines
*
* For drivers with shadow planes, the maximum height of the framebuffer is
* usually independent from hardware limitations. Drivers can initialize struct
* drm_mode_config.max_height from DRM_SHADOW_PLANE_MAX_HEIGHT.
*/
#define DRM_SHADOW_PLANE_MAX_HEIGHT (4096u)
/**
* struct drm_shadow_plane_state - plane state for planes with shadow buffers
*
* For planes that use a shadow buffer, struct drm_shadow_plane_state
* provides the regular plane state plus mappings of the shadow buffer
* into kernel address space.
*/
struct drm_shadow_plane_state {
/** @base: plane state */
struct drm_plane_state base;
/**
* @fmtcnv_state: Format-conversion state
*
* Per-plane state for format conversion.
* Flags for copying shadow buffers into backend storage. Also holds
* temporary storage for format conversion.
*/
struct drm_format_conv_state fmtcnv_state;
/* Transitional state - do not export or duplicate */
/**
* @map: Mappings of the plane's framebuffer BOs in to kernel address space
*
* The memory mappings stored in map should be established in the plane's
* prepare_fb callback and removed in the cleanup_fb callback.
*/
struct iosys_map map[DRM_FORMAT_MAX_PLANES];
/**
* @data: Address of each framebuffer BO's data
*
* The address of the data stored in each mapping. This is different
* for framebuffers with non-zero offset fields.
*/
struct iosys_map data[DRM_FORMAT_MAX_PLANES];
};
/**
* to_drm_shadow_plane_state - upcasts from struct drm_plane_state
* @state: the plane state
*/
static inline struct drm_shadow_plane_state *
to_drm_shadow_plane_state(struct drm_plane_state *state)
{
return container_of(state, struct drm_shadow_plane_state, base);
}
void __drm_gem_duplicate_shadow_plane_state(struct drm_plane *plane,
struct drm_shadow_plane_state *new_shadow_plane_state);
void __drm_gem_destroy_shadow_plane_state(struct drm_shadow_plane_state *shadow_plane_state);
void __drm_gem_reset_shadow_plane(struct drm_plane *plane,
struct drm_shadow_plane_state *shadow_plane_state);
void drm_gem_reset_shadow_plane(struct drm_plane *plane);
struct drm_plane_state *drm_gem_duplicate_shadow_plane_state(struct drm_plane *plane);
void drm_gem_destroy_shadow_plane_state(struct drm_plane *plane,
struct drm_plane_state *plane_state);
/**
* DRM_GEM_SHADOW_PLANE_FUNCS -
* Initializes struct drm_plane_funcs for shadow-buffered planes
*
* Drivers may use GEM BOs as shadow buffers over the framebuffer memory. This
* macro initializes struct drm_plane_funcs to use the rsp helper functions.
*/
#define DRM_GEM_SHADOW_PLANE_FUNCS \
.reset = drm_gem_reset_shadow_plane, \
.atomic_duplicate_state = drm_gem_duplicate_shadow_plane_state, \
.atomic_destroy_state = drm_gem_destroy_shadow_plane_state
int drm_gem_begin_shadow_fb_access(struct drm_plane *plane, struct drm_plane_state *plane_state);
void drm_gem_end_shadow_fb_access(struct drm_plane *plane, struct drm_plane_state *plane_state);
/**
* DRM_GEM_SHADOW_PLANE_HELPER_FUNCS -
* Initializes struct drm_plane_helper_funcs for shadow-buffered planes
*
* Drivers may use GEM BOs as shadow buffers over the framebuffer memory. This
* macro initializes struct drm_plane_helper_funcs to use the rsp helper
* functions.
*/
#define DRM_GEM_SHADOW_PLANE_HELPER_FUNCS \
.begin_fb_access = drm_gem_begin_shadow_fb_access, \
.end_fb_access = drm_gem_end_shadow_fb_access
int drm_gem_simple_kms_begin_shadow_fb_access(struct drm_simple_display_pipe *pipe,
struct drm_plane_state *plane_state);
void drm_gem_simple_kms_end_shadow_fb_access(struct drm_simple_display_pipe *pipe,
struct drm_plane_state *plane_state);
void drm_gem_simple_kms_reset_shadow_plane(struct drm_simple_display_pipe *pipe);
struct drm_plane_state *
drm_gem_simple_kms_duplicate_shadow_plane_state(struct drm_simple_display_pipe *pipe);
void drm_gem_simple_kms_destroy_shadow_plane_state(struct drm_simple_display_pipe *pipe,
struct drm_plane_state *plane_state);
/**
* DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS -
* Initializes struct drm_simple_display_pipe_funcs for shadow-buffered planes
*
* Drivers may use GEM BOs as shadow buffers over the framebuffer memory. This
* macro initializes struct drm_simple_display_pipe_funcs to use the rsp helper
* functions.
*/
#define DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS \
.begin_fb_access = drm_gem_simple_kms_begin_shadow_fb_access, \
.end_fb_access = drm_gem_simple_kms_end_shadow_fb_access, \
.reset_plane = drm_gem_simple_kms_reset_shadow_plane, \
.duplicate_plane_state = drm_gem_simple_kms_duplicate_shadow_plane_state, \
.destroy_plane_state = drm_gem_simple_kms_destroy_shadow_plane_state
#endif /* __DRM_GEM_ATOMIC_HELPER_H__ */