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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"
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);
}
/**
* i915_gem_object_get_frontbuffer - Get the object's frontbuffer
* @obj: The object whose frontbuffer to get.
*
* 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 intel_frontbuffer *
i915_gem_object_get_frontbuffer(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;
}
/**
* i915_gem_object_set_frontbuffer - Set the object's frontbuffer
* @obj: The object whose frontbuffer to set.
* @front: The frontbuffer to set
*
* Set object's frontbuffer pointer. If frontbuffer is already set for the
* object keep it and return it's pointer to the caller. Please note that RCU
* mechanism is used to handle e.g. ongoing removal of frontbuffer pointer. This
* function is protected by i915->display.fb_tracking.lock
*
* Return: pointer to frontbuffer which was set.
*/
static inline struct intel_frontbuffer *
i915_gem_object_set_frontbuffer(struct drm_i915_gem_object *obj,
struct intel_frontbuffer *front)
{
struct intel_frontbuffer *cur = front;
if (!front) {
RCU_INIT_POINTER(obj->frontbuffer, NULL);
} else if (rcu_access_pointer(obj->frontbuffer)) {
cur = rcu_dereference_protected(obj->frontbuffer, true);
kref_get(&cur->ref);
} else {
drm_gem_object_get(intel_bo_to_drm_bo(obj));
rcu_assign_pointer(obj->frontbuffer, front);
}
return cur;
}
#endif
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