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/*
* 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 "gem/i915_gem_object_types.h"
#include "i915_active_types.h"
struct drm_i915_private;
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_i915_gem_object *obj;
struct rcu_head rcu;
};
/*
* 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 drm_i915_private *i915,
unsigned frontbuffer_bits);
void intel_frontbuffer_flip_complete(struct drm_i915_private *i915,
unsigned frontbuffer_bits);
void intel_frontbuffer_flip(struct drm_i915_private *i915,
unsigned frontbuffer_bits);
void intel_frontbuffer_put(struct intel_frontbuffer *front);
static inline struct intel_frontbuffer *
__intel_frontbuffer_get(const struct drm_i915_gem_object *obj)
{
struct intel_frontbuffer *front;
if (likely(!rcu_access_pointer(obj->frontbuffer)))
return NULL;
rcu_read_lock();
do {
front = rcu_dereference(obj->frontbuffer);
if (!front)
break;
if (unlikely(!kref_get_unless_zero(&front->ref)))
continue;
if (likely(front == rcu_access_pointer(obj->frontbuffer)))
break;
intel_frontbuffer_put(front);
} while (1);
rcu_read_unlock();
return front;
}
struct intel_frontbuffer *
intel_frontbuffer_get(struct drm_i915_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_track(struct intel_frontbuffer *old,
struct intel_frontbuffer *new,
unsigned int frontbuffer_bits);
#endif /* __INTEL_FRONTBUFFER_H__ */
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