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f85cd99e2c
The i915_gem_object_get_frontbuffer() name is rather confusing wrt. intel_frontbuffer_get(). Rename to i915_gem_object_frontbuffer_lookup() to make things less confusing. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patch.msgid.link/20251016185408.22735-11-ville.syrjala@linux.intel.com Reviewed-by: Jani Nikula <jani.nikula@intel.com>
85 lines
2.2 KiB
C
85 lines
2.2 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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struct i915_frontbuffer {
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struct intel_frontbuffer base;
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struct drm_i915_gem_object *obj;
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struct i915_active write;
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struct rcu_head rcu;
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struct kref ref;
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};
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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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struct i915_frontbuffer *i915_gem_object_frontbuffer_get(struct drm_i915_gem_object *obj);
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void i915_gem_object_frontbuffer_ref(struct i915_frontbuffer *front);
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void i915_gem_object_frontbuffer_put(struct i915_frontbuffer *front);
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/**
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* i915_gem_object_frontbuffer_lookup - Look up the object's frontbuffer
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* @obj: The object whose frontbuffer to look up.
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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 i915_frontbuffer *
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i915_gem_object_frontbuffer_lookup(const struct drm_i915_gem_object *obj)
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{
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struct i915_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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i915_gem_object_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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#endif
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