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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.
31 lines
1.3 KiB
C++
31 lines
1.3 KiB
C++
/*
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* Copyright (c) 2021, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Memory/ScatterGatherList.h>
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namespace Kernel::Memory {
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LockRefPtr<ScatterGatherList> ScatterGatherList::try_create(AsyncBlockDeviceRequest& request, Span<NonnullRefPtr<PhysicalPage>> allocated_pages, size_t device_block_size)
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{
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auto maybe_vm_object = AnonymousVMObject::try_create_with_physical_pages(allocated_pages);
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if (maybe_vm_object.is_error()) {
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// FIXME: Would be nice to be able to return a ErrorOr here.
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return {};
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}
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return adopt_lock_ref_if_nonnull(new (nothrow) ScatterGatherList(maybe_vm_object.release_value(), request, device_block_size));
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}
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ScatterGatherList::ScatterGatherList(NonnullLockRefPtr<AnonymousVMObject> vm_object, AsyncBlockDeviceRequest& request, size_t device_block_size)
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: m_vm_object(move(vm_object))
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{
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auto region_or_error = MM.allocate_kernel_region_with_vmobject(m_vm_object, page_round_up((request.block_count() * device_block_size)).release_value_but_fixme_should_propagate_errors(), "AHCI Scattered DMA"sv, Region::Access::Read | Region::Access::Write, Region::Cacheable::Yes);
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if (region_or_error.is_error())
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TODO();
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m_dma_region = region_or_error.release_value();
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}
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}
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