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Kernel: Make AnonymousVMObject physical page APIs OOM safe

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AnonymousVMObject::create_with_physical_page(s) can't be NonnullRefPtr
as it allocates internally. Fixing the API then surfaced an issue in
ScatterGatherList, where the code was attempting to create an
AnonymousVMObject in the constructor which will not be observable
during OOM.

Fix all of these issues and start propagating errors at the callers
of the AnonymousVMObject and ScatterGatherList APis.
This commit is contained in:
Brian Gianforcaro 2021-05-14 05:06:29 -07:00 • committed by Andreas Kling
parent d45db06826
commit a324d4d6a3
6 changed files with 20 additions and 13 deletions
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11
Kernel/VM/ScatterGatherList.cpp
View file

@ -8,13 +8,16 @@
namespace Kernel {
NonnullRefPtr<ScatterGatherList> ScatterGatherList::create(AsyncBlockDeviceRequest& request, NonnullRefPtrVector<PhysicalPage> allocated_pages, size_t device_block_size)
RefPtr<ScatterGatherList> ScatterGatherList::create(AsyncBlockDeviceRequest& request, NonnullRefPtrVector<PhysicalPage> allocated_pages, size_t device_block_size)
{
return adopt_ref(*new ScatterGatherList(request, allocated_pages, device_block_size));
auto vm_object = AnonymousVMObject::create_with_physical_pages(allocated_pages);
if (!vm_object)
return {};
return adopt_ref_if_nonnull(new ScatterGatherList(vm_object.release_nonnull(), request, device_block_size));
}
ScatterGatherList::ScatterGatherList(AsyncBlockDeviceRequest& request, NonnullRefPtrVector<PhysicalPage> allocated_pages, size_t device_block_size)
: m_vm_object(AnonymousVMObject::create_with_physical_pages(allocated_pages))
ScatterGatherList::ScatterGatherList(NonnullRefPtr<AnonymousVMObject> vm_object, AsyncBlockDeviceRequest& request, size_t device_block_size)
: m_vm_object(move(vm_object))
{
m_dma_region = MM.allocate_kernel_region_with_vmobject(m_vm_object, page_round_up((request.block_count() * device_block_size)), "AHCI Scattered DMA", Region::Access::Read | Region::Access::Write, Region::Cacheable::Yes);
}