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Commit 53812c11 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

amd-iommu: handle page table allocation failures in dma_ops code 



The code will be required when the aperture size increases dynamically
in the extended address allocator.

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent 8bda3092

arch/x86/kernel/amd_iommu.c

+18 −2
Original line number Diff line number Diff line
@@ -1193,6 +1193,8 @@ static dma_addr_t dma_ops_domain_map(struct amd_iommu *iommu, 
	paddr &= PAGE_MASK;



	pte  = dma_ops_get_pte(dom, address);

	if (!pte)

		return bad_dma_address;



	__pte = paddr | IOMMU_PTE_P | IOMMU_PTE_FC;
@@ -1248,7 +1250,7 @@ static dma_addr_t __map_single(struct device *dev, 
			       u64 dma_mask)

{

	dma_addr_t offset = paddr & ~PAGE_MASK;

	dma_addr_t address, start;

	dma_addr_t address, start, ret;

	unsigned int pages;

	unsigned long align_mask = 0;

	int i;
@@ -1271,7 +1273,10 @@ static dma_addr_t __map_single(struct device *dev, 


	start = address;

	for (i = 0; i < pages; ++i) {

		dma_ops_domain_map(iommu, dma_dom, start, paddr, dir);

		ret = dma_ops_domain_map(iommu, dma_dom, start, paddr, dir);

		if (ret == bad_dma_address)

			goto out_unmap;



		paddr += PAGE_SIZE;

		start += PAGE_SIZE;

	}
@@ -1287,6 +1292,17 @@ static dma_addr_t __map_single(struct device *dev, 


out:

	return address;



out_unmap:



	for (--i; i >= 0; --i) {

		start -= PAGE_SIZE;

		dma_ops_domain_unmap(iommu, dma_dom, start);

	}



	dma_ops_free_addresses(dma_dom, address, pages);



	return bad_dma_address;

}



/*