501069dad5
As a preparation for Xe we want to remove all i915_gem_object details away from frontbuffer tacking code. Due to this move releasing gem object reference to i915_gem_object_set_frontbuffer. Signed-off-by: Jouni Högander <jouni.hogander@intel.com> Reviewed-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com> Link: https://patchwork.freedesktop.org/patch/msgid/20231012072158.4115795-2-jouni.hogander@intel.com
104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* Copyright © 2023 Intel Corporation
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*/
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#ifndef __I915_GEM_OBJECT_FRONTBUFFER_H__
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#define __I915_GEM_OBJECT_FRONTBUFFER_H__
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#include <linux/kref.h>
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#include <linux/rcupdate.h>
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#include "display/intel_frontbuffer.h"
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#include "i915_gem_object_types.h"
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void __i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,
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enum fb_op_origin origin);
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void __i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj,
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enum fb_op_origin origin);
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static inline void
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i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj,
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enum fb_op_origin origin)
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{
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if (unlikely(rcu_access_pointer(obj->frontbuffer)))
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__i915_gem_object_flush_frontbuffer(obj, origin);
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}
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static inline void
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i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj,
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enum fb_op_origin origin)
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{
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if (unlikely(rcu_access_pointer(obj->frontbuffer)))
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__i915_gem_object_invalidate_frontbuffer(obj, origin);
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}
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/**
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* i915_gem_object_get_frontbuffer - Get the object's frontbuffer
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* @obj: The object whose frontbuffer to get.
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*
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* Get pointer to object's frontbuffer if such exists. Please note that RCU
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* mechanism is used to handle e.g. ongoing removal of frontbuffer pointer.
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*
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* Return: pointer to object's frontbuffer is such exists or NULL
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*/
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static inline struct intel_frontbuffer *
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i915_gem_object_get_frontbuffer(const struct drm_i915_gem_object *obj)
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{
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struct intel_frontbuffer *front;
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if (likely(!rcu_access_pointer(obj->frontbuffer)))
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return NULL;
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rcu_read_lock();
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do {
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front = rcu_dereference(obj->frontbuffer);
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if (!front)
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break;
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if (unlikely(!kref_get_unless_zero(&front->ref)))
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continue;
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if (likely(front == rcu_access_pointer(obj->frontbuffer)))
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break;
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intel_frontbuffer_put(front);
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} while (1);
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rcu_read_unlock();
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return front;
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}
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/**
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* i915_gem_object_set_frontbuffer - Set the object's frontbuffer
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* @obj: The object whose frontbuffer to set.
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* @front: The frontbuffer to set
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*
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* Set object's frontbuffer pointer. If frontbuffer is already set for the
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* object keep it and return it's pointer to the caller. Please note that RCU
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* mechanism is used to handle e.g. ongoing removal of frontbuffer pointer. This
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* function is protected by i915->display.fb_tracking.lock
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*
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* Return: pointer to frontbuffer which was set.
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*/
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static inline struct intel_frontbuffer *
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i915_gem_object_set_frontbuffer(struct drm_i915_gem_object *obj,
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struct intel_frontbuffer *front)
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{
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struct intel_frontbuffer *cur = front;
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if (!front) {
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RCU_INIT_POINTER(obj->frontbuffer, NULL);
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drm_gem_object_put(intel_bo_to_drm_bo(obj));
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} else if (rcu_access_pointer(obj->frontbuffer)) {
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cur = rcu_dereference_protected(obj->frontbuffer, true);
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kref_get(&cur->ref);
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} else {
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drm_gem_object_get(intel_bo_to_drm_bo(obj));
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rcu_assign_pointer(obj->frontbuffer, front);
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}
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return cur;
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}
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#endif
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