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Kernel: Add DMA allocate functions that are TRY-able

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Add DMA allocate buffer helper functions in MemoryManager.
This commit is contained in:
Pankaj Raghav 2021-12-16 20:35:51 +05:30 • committed by Andreas Kling
parent 8489388e75
commit 602b35aa62
2 changed files with 21 additions and 0 deletions
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19
Kernel/Memory/MemoryManager.cpp
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@ -733,6 +733,25 @@ ErrorOr<NonnullOwnPtr<Region>> MemoryManager::allocate_contiguous_kernel_region(
return allocate_kernel_region_with_vmobject(range, move(vmobject), name, access, cacheable);
}
ErrorOr<NonnullOwnPtr<Memory::Region>> MemoryManager::allocate_dma_buffer_page(StringView name, Memory::Region::Access access, RefPtr<Memory::PhysicalPage>& dma_buffer_page)
{
dma_buffer_page = allocate_supervisor_physical_page();
if (dma_buffer_page.is_null())
return ENOMEM;
auto region_or_error = allocate_kernel_region(dma_buffer_page->paddr(), PAGE_SIZE, name, access);
return region_or_error;
}
ErrorOr<NonnullOwnPtr<Memory::Region>> MemoryManager::allocate_dma_buffer_pages(size_t size, StringView name, Memory::Region::Access access, NonnullRefPtrVector<Memory::PhysicalPage>& dma_buffer_pages)
{
VERIFY(!(size % PAGE_SIZE));
dma_buffer_pages = allocate_contiguous_supervisor_physical_pages(size);
if (dma_buffer_pages.is_empty())
return ENOMEM;
auto region_or_error = allocate_kernel_region(dma_buffer_pages.first().paddr(), size, name, access);
return region_or_error;
}
ErrorOr<NonnullOwnPtr<Region>> MemoryManager::allocate_kernel_region(size_t size, StringView name, Region::Access access, AllocationStrategy strategy, Region::Cacheable cacheable)
{
VERIFY(!(size % PAGE_SIZE));