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/* SPDX-License-Identifier: MIT */
/*
* Copyright © 2023 Intel Corporation
*/
#ifndef __I915_GEM_OBJECT_FRONTBUFFER_H__
#define __I915_GEM_OBJECT_FRONTBUFFER_H__
#include <linux/kref.h>
#include <linux/rcupdate.h>
#include "display/intel_frontbuffer.h"
#include "i915_gem_object_types.h"
struct i915_frontbuffer {
struct intel_frontbuffer base;
struct drm_i915_gem_object *obj;
struct i915_active write;
struct rcu_head rcu;
struct kref ref;
};
void __i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,
enum fb_op_origin origin);
void __i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj,
enum fb_op_origin origin);
static inline void
i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,
enum fb_op_origin origin)
{
if (unlikely(rcu_access_pointer(obj->frontbuffer)))
__i915_gem_object_flush_frontbuffer(obj, origin);
}
static inline void
i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj,
enum fb_op_origin origin)
{
if (unlikely(rcu_access_pointer(obj->frontbuffer)))
__i915_gem_object_invalidate_frontbuffer(obj, origin);
}
struct i915_frontbuffer *i915_gem_object_frontbuffer_get(struct drm_i915_gem_object *obj);
void i915_gem_object_frontbuffer_ref(struct i915_frontbuffer *front);
void i915_gem_object_frontbuffer_put(struct i915_frontbuffer *front);
/**
* i915_gem_object_frontbuffer_lookup - Look up the object's frontbuffer
* @obj: The object whose frontbuffer to look up.
*
* Get pointer to object's frontbuffer if such exists. Please note that RCU
* mechanism is used to handle e.g. ongoing removal of frontbuffer pointer.
*
* Return: pointer to object's frontbuffer is such exists or NULL
*/
static inline struct i915_frontbuffer *
i915_gem_object_frontbuffer_lookup(const struct drm_i915_gem_object *obj)
{
struct i915_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;
i915_gem_object_frontbuffer_put(front);
} while (1);
rcu_read_unlock();
return front;
}
#endif
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