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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.
120 lines
5.2 KiB
C++
120 lines
5.2 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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#include <Kernel/FileSystem/Inode.h>
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#include <Kernel/Locking/Spinlock.h>
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#include <Kernel/Memory/SharedFramebufferVMObject.h>
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namespace Kernel::Memory {
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ErrorOr<NonnullLockRefPtr<SharedFramebufferVMObject>> SharedFramebufferVMObject::try_create_for_physical_range(PhysicalAddress paddr, size_t size)
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{
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auto real_framebuffer_vmobject = TRY(AnonymousVMObject::try_create_for_physical_range(paddr, size));
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auto new_physical_pages = TRY(VMObject::try_create_physical_pages(size));
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auto committed_pages = TRY(MM.commit_physical_pages(ceil_div(size, static_cast<size_t>(PAGE_SIZE))));
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auto vm_object = TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) SharedFramebufferVMObject(move(new_physical_pages), move(committed_pages), real_framebuffer_vmobject)));
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TRY(vm_object->create_fake_writes_framebuffer_vm_object());
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TRY(vm_object->create_real_writes_framebuffer_vm_object());
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return vm_object;
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}
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ErrorOr<NonnullLockRefPtr<SharedFramebufferVMObject>> SharedFramebufferVMObject::try_create_at_arbitrary_physical_range(size_t size)
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{
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auto real_framebuffer_vmobject = TRY(AnonymousVMObject::try_create_with_size(size, AllocationStrategy::AllocateNow));
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auto new_physical_pages = TRY(VMObject::try_create_physical_pages(size));
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auto committed_pages = TRY(MM.commit_physical_pages(ceil_div(size, static_cast<size_t>(PAGE_SIZE))));
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auto vm_object = TRY(adopt_nonnull_lock_ref_or_enomem(new (nothrow) SharedFramebufferVMObject(move(new_physical_pages), move(committed_pages), real_framebuffer_vmobject)));
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TRY(vm_object->create_fake_writes_framebuffer_vm_object());
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TRY(vm_object->create_real_writes_framebuffer_vm_object());
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return vm_object;
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}
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ErrorOr<NonnullLockRefPtr<SharedFramebufferVMObject::FakeWritesFramebufferVMObject>> SharedFramebufferVMObject::FakeWritesFramebufferVMObject::try_create(Badge<SharedFramebufferVMObject>, SharedFramebufferVMObject const& parent_object)
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{
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auto new_physical_pages = TRY(VMObject::try_create_physical_pages(0));
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return adopt_nonnull_lock_ref_or_enomem(new (nothrow) FakeWritesFramebufferVMObject(parent_object, move(new_physical_pages)));
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}
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ErrorOr<NonnullLockRefPtr<SharedFramebufferVMObject::RealWritesFramebufferVMObject>> SharedFramebufferVMObject::RealWritesFramebufferVMObject::try_create(Badge<SharedFramebufferVMObject>, SharedFramebufferVMObject const& parent_object)
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{
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auto new_physical_pages = TRY(VMObject::try_create_physical_pages(0));
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return adopt_nonnull_lock_ref_or_enomem(new (nothrow) RealWritesFramebufferVMObject(parent_object, move(new_physical_pages)));
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}
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ErrorOr<void> SharedFramebufferVMObject::create_fake_writes_framebuffer_vm_object()
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{
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m_fake_writes_framebuffer_vmobject = TRY(FakeWritesFramebufferVMObject::try_create({}, *this));
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return {};
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}
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ErrorOr<void> SharedFramebufferVMObject::create_real_writes_framebuffer_vm_object()
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{
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m_real_writes_framebuffer_vmobject = TRY(RealWritesFramebufferVMObject::try_create({}, *this));
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return {};
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}
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Span<RefPtr<PhysicalPage>> SharedFramebufferVMObject::real_framebuffer_physical_pages()
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{
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return m_real_framebuffer_vmobject->physical_pages();
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}
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Span<RefPtr<PhysicalPage> const> SharedFramebufferVMObject::real_framebuffer_physical_pages() const
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{
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return m_real_framebuffer_vmobject->physical_pages();
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}
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Span<RefPtr<PhysicalPage>> SharedFramebufferVMObject::fake_sink_framebuffer_physical_pages()
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{
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return m_physical_pages.span();
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}
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Span<RefPtr<PhysicalPage> const> SharedFramebufferVMObject::fake_sink_framebuffer_physical_pages() const
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{
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return m_physical_pages.span();
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}
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void SharedFramebufferVMObject::switch_to_fake_sink_framebuffer_writes(Badge<Kernel::DisplayConnector>)
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{
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SpinlockLocker locker(m_writes_state_lock);
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m_writes_are_faked = true;
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for_each_region([](Region& region) {
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region.remap();
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});
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}
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void SharedFramebufferVMObject::switch_to_real_framebuffer_writes(Badge<Kernel::DisplayConnector>)
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{
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SpinlockLocker locker(m_writes_state_lock);
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m_writes_are_faked = false;
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for_each_region([](Region& region) {
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region.remap();
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});
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}
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Span<RefPtr<PhysicalPage> const> SharedFramebufferVMObject::physical_pages() const
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{
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SpinlockLocker locker(m_writes_state_lock);
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if (m_writes_are_faked)
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return VMObject::physical_pages();
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return m_real_framebuffer_vmobject->physical_pages();
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}
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Span<RefPtr<PhysicalPage>> SharedFramebufferVMObject::physical_pages()
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{
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SpinlockLocker locker(m_writes_state_lock);
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if (m_writes_are_faked)
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return VMObject::physical_pages();
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return m_real_framebuffer_vmobject->physical_pages();
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}
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SharedFramebufferVMObject::SharedFramebufferVMObject(FixedArray<RefPtr<PhysicalPage>>&& new_physical_pages, CommittedPhysicalPageSet committed_pages, AnonymousVMObject& real_framebuffer_vmobject)
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: VMObject(move(new_physical_pages))
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, m_real_framebuffer_vmobject(real_framebuffer_vmobject)
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, m_committed_pages(move(committed_pages))
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{
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// Allocate all pages right now. We know we can get all because we committed the amount needed
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for (size_t i = 0; i < page_count(); ++i)
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m_physical_pages[i] = m_committed_pages.take_one();
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}
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}
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