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// SPDX-License-Identifier: MIT
/* Copyright © 2025 Intel Corporation */
#include <drm/intel/display_parent_interface.h>
#include "i915_drv.h"
#include "i915_gem_object_frontbuffer.h"
static int frontbuffer_active(struct i915_active *ref)
{
struct i915_frontbuffer *front =
container_of(ref, typeof(*front), write);
kref_get(&front->ref);
return 0;
}
static void frontbuffer_retire(struct i915_active *ref)
{
struct i915_frontbuffer *front =
container_of(ref, typeof(*front), write);
intel_frontbuffer_flush(&front->base, ORIGIN_CS);
i915_gem_object_frontbuffer_put(front);
}
struct i915_frontbuffer *
i915_gem_object_frontbuffer_get(struct drm_i915_gem_object *obj)
{
struct drm_i915_private *i915 = to_i915(obj->base.dev);
struct i915_frontbuffer *front, *cur;
front = i915_gem_object_frontbuffer_lookup(obj);
if (front)
return front;
front = kmalloc_obj(*front);
if (!front)
return NULL;
intel_frontbuffer_init(&front->base, &i915->drm);
kref_init(&front->ref);
i915_gem_object_get(obj);
front->obj = obj;
i915_active_init(&front->write,
frontbuffer_active,
frontbuffer_retire,
I915_ACTIVE_RETIRE_SLEEPS);
spin_lock(&i915->frontbuffer_lock);
if (rcu_access_pointer(obj->frontbuffer)) {
cur = rcu_dereference_protected(obj->frontbuffer, true);
kref_get(&cur->ref);
} else {
cur = front;
rcu_assign_pointer(obj->frontbuffer, front);
}
spin_unlock(&i915->frontbuffer_lock);
if (cur != front) {
i915_gem_object_put(obj);
intel_frontbuffer_fini(&front->base);
kfree(front);
}
return cur;
}
void i915_gem_object_frontbuffer_ref(struct i915_frontbuffer *front)
{
kref_get(&front->ref);
}
static void frontbuffer_release(struct kref *ref)
__releases(&i915->frontbuffer_lock)
{
struct i915_frontbuffer *front =
container_of(ref, typeof(*front), ref);
struct drm_i915_gem_object *obj = front->obj;
struct drm_i915_private *i915 = to_i915(obj->base.dev);
i915_ggtt_clear_scanout(obj);
RCU_INIT_POINTER(obj->frontbuffer, NULL);
spin_unlock(&i915->frontbuffer_lock);
i915_active_fini(&front->write);
i915_gem_object_put(obj);
intel_frontbuffer_fini(&front->base);
kfree_rcu(front, rcu);
}
void i915_gem_object_frontbuffer_put(struct i915_frontbuffer *front)
{
struct drm_i915_private *i915 = to_i915(front->obj->base.dev);
kref_put_lock(&front->ref, frontbuffer_release,
&i915->frontbuffer_lock);
}
void __i915_gem_object_frontbuffer_flush(struct drm_i915_gem_object *obj,
enum fb_op_origin origin)
{
struct i915_frontbuffer *front;
front = i915_gem_object_frontbuffer_lookup(obj);
if (front) {
intel_frontbuffer_flush(&front->base, origin);
i915_gem_object_frontbuffer_put(front);
}
}
void __i915_gem_object_frontbuffer_invalidate(struct drm_i915_gem_object *obj,
enum fb_op_origin origin)
{
struct i915_frontbuffer *front;
front = i915_gem_object_frontbuffer_lookup(obj);
if (front) {
intel_frontbuffer_invalidate(&front->base, origin);
i915_gem_object_frontbuffer_put(front);
}
}
static struct intel_frontbuffer *i915_frontbuffer_get(struct drm_gem_object *_obj)
{
struct drm_i915_gem_object *obj = to_intel_bo(_obj);
struct i915_frontbuffer *front;
front = i915_gem_object_frontbuffer_get(obj);
if (!front)
return NULL;
return &front->base;
}
static void i915_frontbuffer_ref(struct intel_frontbuffer *_front)
{
struct i915_frontbuffer *front =
container_of(_front, typeof(*front), base);
i915_gem_object_frontbuffer_ref(front);
}
static void i915_frontbuffer_put(struct intel_frontbuffer *_front)
{
struct i915_frontbuffer *front =
container_of(_front, typeof(*front), base);
return i915_gem_object_frontbuffer_put(front);
}
static void i915_frontbuffer_flush_for_display(struct intel_frontbuffer *_front)
{
struct i915_frontbuffer *front =
container_of(_front, typeof(*front), base);
i915_gem_object_flush_if_display(front->obj);
}
const struct intel_display_frontbuffer_interface i915_display_frontbuffer_interface = {
.get = i915_frontbuffer_get,
.ref = i915_frontbuffer_ref,
.put = i915_frontbuffer_put,
.flush_for_display = i915_frontbuffer_flush_for_display,
};
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