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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>
104 lines
2.3 KiB
C
104 lines
2.3 KiB
C
// SPDX-License-Identifier: MIT
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/* Copyright © 2025 Intel Corporation */
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#include "i915_drv.h"
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#include "i915_gem_object_frontbuffer.h"
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static int frontbuffer_active(struct i915_active *ref)
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{
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struct i915_frontbuffer *front =
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container_of(ref, typeof(*front), write);
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kref_get(&front->ref);
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return 0;
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}
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static void frontbuffer_retire(struct i915_active *ref)
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{
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struct i915_frontbuffer *front =
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container_of(ref, typeof(*front), write);
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intel_frontbuffer_flush(&front->base, ORIGIN_CS);
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i915_gem_object_frontbuffer_put(front);
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}
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struct i915_frontbuffer *
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i915_gem_object_frontbuffer_get(struct drm_i915_gem_object *obj)
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{
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struct drm_i915_private *i915 = to_i915(obj->base.dev);
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struct i915_frontbuffer *front, *cur;
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front = i915_gem_object_frontbuffer_lookup(obj);
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if (front)
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return front;
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front = kmalloc(sizeof(*front), GFP_KERNEL);
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if (!front)
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return NULL;
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intel_frontbuffer_init(&front->base, &i915->drm);
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kref_init(&front->ref);
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i915_gem_object_get(obj);
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front->obj = obj;
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i915_active_init(&front->write,
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frontbuffer_active,
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frontbuffer_retire,
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I915_ACTIVE_RETIRE_SLEEPS);
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spin_lock(&i915->frontbuffer_lock);
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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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cur = front;
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rcu_assign_pointer(obj->frontbuffer, front);
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}
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spin_unlock(&i915->frontbuffer_lock);
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if (cur != front) {
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i915_gem_object_put(obj);
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intel_frontbuffer_fini(&front->base);
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kfree(front);
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}
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return cur;
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}
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void i915_gem_object_frontbuffer_ref(struct i915_frontbuffer *front)
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{
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kref_get(&front->ref);
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}
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static void frontbuffer_release(struct kref *ref)
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__releases(&i915->frontbuffer_lock)
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{
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struct i915_frontbuffer *front =
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container_of(ref, typeof(*front), ref);
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struct drm_i915_gem_object *obj = front->obj;
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struct drm_i915_private *i915 = to_i915(obj->base.dev);
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i915_ggtt_clear_scanout(obj);
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RCU_INIT_POINTER(obj->frontbuffer, NULL);
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spin_unlock(&i915->frontbuffer_lock);
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i915_active_fini(&front->write);
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i915_gem_object_put(obj);
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intel_frontbuffer_fini(&front->base);
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kfree_rcu(front, rcu);
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}
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void i915_gem_object_frontbuffer_put(struct i915_frontbuffer *front)
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{
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struct drm_i915_private *i915 = to_i915(front->obj->base.dev);
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kref_put_lock(&front->ref, frontbuffer_release,
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&i915->frontbuffer_lock);
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}
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