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Commit 8f7a017c authored by Joerg Roedel's avatar Joerg Roedel
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x86/amd-iommu: Use 2-level page tables for dma_ops domains 



The driver now supports a dynamic number of levels for IO
page tables. This allows to reduce the number of levels for
dma_ops domains by one because a dma_ops domain has usually
an address space size between 128MB and 4G.

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent bad1cac2

arch/x86/kernel/amd_iommu.c

+1 −1
Original line number Diff line number Diff line
@@ -1010,7 +1010,7 @@ static struct dma_ops_domain *dma_ops_domain_alloc(struct amd_iommu *iommu) 
	dma_dom->domain.id = domain_id_alloc();

	if (dma_dom->domain.id == 0)

		goto free_dma_dom;

	dma_dom->domain.mode = PAGE_MODE_3_LEVEL;

	dma_dom->domain.mode = PAGE_MODE_2_LEVEL;

	dma_dom->domain.pt_root = (void *)get_zeroed_page(GFP_KERNEL);

	dma_dom->domain.flags = PD_DMA_OPS_MASK;

	dma_dom->domain.priv = dma_dom;