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2c72d495a3
I believe this to be safe, as the main thing that LockRefPtr provides over RefPtr is safe copying from a shared LockRefPtr instance. I've inspected the uses of RefPtr<PhysicalPage> and it seems they're all guarded by external locking. Some of it is less obvious, but this is an area where we're making continuous headway.
94 lines
4.8 KiB
C++
94 lines
4.8 KiB
C++
/*
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* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <Kernel/Forward.h>
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#include <Kernel/Memory/AllocationStrategy.h>
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#include <Kernel/Memory/AnonymousVMObject.h>
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#include <Kernel/Memory/MemoryManager.h>
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#include <Kernel/Memory/PageFaultResponse.h>
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#include <Kernel/PhysicalAddress.h>
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namespace Kernel::Memory {
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class SharedFramebufferVMObject final : public VMObject {
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public:
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class FakeWritesFramebufferVMObject final : public VMObject {
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public:
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static ErrorOr<NonnullLockRefPtr<FakeWritesFramebufferVMObject>> try_create(Badge<SharedFramebufferVMObject>, SharedFramebufferVMObject const& parent_object);
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private:
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FakeWritesFramebufferVMObject(SharedFramebufferVMObject const& parent_object, FixedArray<RefPtr<PhysicalPage>>&& new_physical_pages)
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: VMObject(move(new_physical_pages))
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, m_parent_object(parent_object)
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{
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}
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virtual StringView class_name() const override { return "FakeWritesFramebufferVMObject"sv; }
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virtual ErrorOr<NonnullLockRefPtr<VMObject>> try_clone() override { return Error::from_errno(ENOTIMPL); }
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virtual Span<RefPtr<PhysicalPage> const> physical_pages() const override { return m_parent_object->fake_sink_framebuffer_physical_pages(); }
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virtual Span<RefPtr<PhysicalPage>> physical_pages() override { return m_parent_object->fake_sink_framebuffer_physical_pages(); }
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NonnullLockRefPtr<SharedFramebufferVMObject> m_parent_object;
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};
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class RealWritesFramebufferVMObject final : public VMObject {
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public:
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static ErrorOr<NonnullLockRefPtr<RealWritesFramebufferVMObject>> try_create(Badge<SharedFramebufferVMObject>, SharedFramebufferVMObject const& parent_object);
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private:
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RealWritesFramebufferVMObject(SharedFramebufferVMObject const& parent_object, FixedArray<RefPtr<PhysicalPage>>&& new_physical_pages)
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: VMObject(move(new_physical_pages))
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, m_parent_object(parent_object)
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{
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}
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virtual StringView class_name() const override { return "RealWritesFramebufferVMObject"sv; }
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virtual ErrorOr<NonnullLockRefPtr<VMObject>> try_clone() override { return Error::from_errno(ENOTIMPL); }
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virtual Span<RefPtr<PhysicalPage> const> physical_pages() const override { return m_parent_object->real_framebuffer_physical_pages(); }
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virtual Span<RefPtr<PhysicalPage>> physical_pages() override { return m_parent_object->real_framebuffer_physical_pages(); }
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NonnullLockRefPtr<SharedFramebufferVMObject> m_parent_object;
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};
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virtual ~SharedFramebufferVMObject() override = default;
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static ErrorOr<NonnullLockRefPtr<SharedFramebufferVMObject>> try_create_for_physical_range(PhysicalAddress paddr, size_t size);
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static ErrorOr<NonnullLockRefPtr<SharedFramebufferVMObject>> try_create_at_arbitrary_physical_range(size_t size);
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virtual ErrorOr<NonnullLockRefPtr<VMObject>> try_clone() override { return Error::from_errno(ENOTIMPL); }
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void switch_to_fake_sink_framebuffer_writes(Badge<Kernel::DisplayConnector>);
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void switch_to_real_framebuffer_writes(Badge<Kernel::DisplayConnector>);
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virtual Span<RefPtr<PhysicalPage> const> physical_pages() const override;
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virtual Span<RefPtr<PhysicalPage>> physical_pages() override;
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Span<RefPtr<PhysicalPage>> fake_sink_framebuffer_physical_pages();
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Span<RefPtr<PhysicalPage> const> fake_sink_framebuffer_physical_pages() const;
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Span<RefPtr<PhysicalPage>> real_framebuffer_physical_pages();
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Span<RefPtr<PhysicalPage> const> real_framebuffer_physical_pages() const;
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FakeWritesFramebufferVMObject const& fake_writes_framebuffer_vmobject() const { return *m_fake_writes_framebuffer_vmobject; }
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FakeWritesFramebufferVMObject& fake_writes_framebuffer_vmobject() { return *m_fake_writes_framebuffer_vmobject; }
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RealWritesFramebufferVMObject const& real_writes_framebuffer_vmobject() const { return *m_real_writes_framebuffer_vmobject; }
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RealWritesFramebufferVMObject& real_writes_framebuffer_vmobject() { return *m_real_writes_framebuffer_vmobject; }
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private:
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SharedFramebufferVMObject(FixedArray<RefPtr<PhysicalPage>>&& new_physical_pages, CommittedPhysicalPageSet, AnonymousVMObject& real_framebuffer_vmobject);
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virtual StringView class_name() const override { return "SharedFramebufferVMObject"sv; }
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ErrorOr<void> create_fake_writes_framebuffer_vm_object();
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ErrorOr<void> create_real_writes_framebuffer_vm_object();
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NonnullLockRefPtr<AnonymousVMObject> m_real_framebuffer_vmobject;
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LockRefPtr<FakeWritesFramebufferVMObject> m_fake_writes_framebuffer_vmobject;
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LockRefPtr<RealWritesFramebufferVMObject> m_real_writes_framebuffer_vmobject;
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bool m_writes_are_faked { false };
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mutable RecursiveSpinlock m_writes_state_lock { LockRank::None };
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CommittedPhysicalPageSet m_committed_pages;
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};
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}
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