/*
* Copyright ( c ) 2014 - 2016 Intel Corporation
*
* 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
* THE AUTHORS OR COPYRIGHT HOLDERS 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 __INTEL_FRONTBUFFER_H__
#define __INTEL_FRONTBUFFER_H__
#include <linux/atomic.h>
#include <linux/bits.h>
#include <linux/kref.h>
#include "i915_active_types.h"
struct drm_gem_object;
struct intel_display;
enum fb_op_origin {
ORIGIN_CPU = 0 ,
ORIGIN_CS,
ORIGIN_FLIP,
ORIGIN_DIRTYFB,
ORIGIN_CURSOR_UPDATE,
};
struct intel_frontbuffer {
struct kref ref;
atomic_t bits;
struct i915_active write;
struct drm_gem_object *obj;
struct rcu_head rcu;
struct work_struct flush_work;
};
/*
* Frontbuffer tracking bits . Set in obj - > frontbuffer_bits while a gem bo is
* considered to be the frontbuffer for the given plane interface - wise . This
* doesn ' t mean that the hw necessarily already scans it out , but that any
* rendering ( by the cpu or gpu ) will land in the frontbuffer eventually .
*
* We have one bit per pipe and per scanout plane type .
*/
#define INTEL_FRONTBUFFER_BITS_PER_PIPE 8
#define INTEL_FRONTBUFFER(pipe, plane_id) \
BIT((plane_id) + INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe));
#define INTEL_FRONTBUFFER_OVERLAY(pipe) \
BIT(INTEL_FRONTBUFFER_BITS_PER_PIPE - 1 + INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe))
#define INTEL_FRONTBUFFER_ALL_MASK(pipe) \
GENMASK(INTEL_FRONTBUFFER_BITS_PER_PIPE * ((pipe) + 1 ) - 1 , \
INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe))
void intel_frontbuffer_flip_prepare(struct intel_display *display,
unsigned frontbuffer_bits);
void intel_frontbuffer_flip_complete(struct intel_display *display,
unsigned frontbuffer_bits);
void intel_frontbuffer_flip(struct intel_display *display,
unsigned frontbuffer_bits);
void intel_frontbuffer_put(struct intel_frontbuffer *front);
struct intel_frontbuffer *
intel_frontbuffer_get(struct drm_gem_object *obj);
void __intel_fb_invalidate(struct intel_frontbuffer *front,
enum fb_op_origin origin,
unsigned int frontbuffer_bits);
/**
* intel_frontbuffer_invalidate - invalidate frontbuffer object
* @ front : GEM object to invalidate
* @ origin : which operation caused the invalidation
*
* This function gets called every time rendering on the given object starts and
* frontbuffer caching ( fbc , low refresh rate for DRRS , panel self refresh ) must
* be invalidated . For ORIGIN_CS any subsequent invalidation will be delayed
* until the rendering completes or a flip on this frontbuffer plane is
* scheduled .
*/
static inline bool intel_frontbuffer_invalidate(struct intel_frontbuffer *front,
enum fb_op_origin origin)
{
unsigned int frontbuffer_bits;
if (!front)
return false ;
frontbuffer_bits = atomic_read(&front->bits);
if (!frontbuffer_bits)
return false ;
__intel_fb_invalidate(front, origin, frontbuffer_bits);
return true ;
}
void __intel_fb_flush(struct intel_frontbuffer *front,
enum fb_op_origin origin,
unsigned int frontbuffer_bits);
/**
* intel_frontbuffer_flush - flush frontbuffer object
* @ front : GEM object to flush
* @ origin : which operation caused the flush
*
* This function gets called every time rendering on the given object has
* completed and frontbuffer caching can be started again .
*/
static inline void intel_frontbuffer_flush(struct intel_frontbuffer *front,
enum fb_op_origin origin)
{
unsigned int frontbuffer_bits;
if (!front)
return ;
frontbuffer_bits = atomic_read(&front->bits);
if (!frontbuffer_bits)
return ;
__intel_fb_flush(front, origin, frontbuffer_bits);
}
void intel_frontbuffer_queue_flush(struct intel_frontbuffer *front);
void intel_frontbuffer_track(struct intel_frontbuffer *old,
struct intel_frontbuffer *new ,
unsigned int frontbuffer_bits);
#endif /* __INTEL_FRONTBUFFER_H__ */
Messung V0.5 in Prozent C=94 H=96 G=94
¤ Dauer der Verarbeitung: 0.8 Sekunden
(vorverarbeitet am 2026-10-12)
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