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Commit eb74ff6c authored by Joerg Roedel's avatar Joerg Roedel
Browse files

AMD IOMMU: add domain unmap function for IOMMU API 



Impact: add a generic function to unmap pages into protection domains

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
parent c6229ca6

arch/x86/kernel/amd_iommu.c

+41 −0
Original line number Diff line number Diff line
@@ -445,6 +445,30 @@ static int iommu_map_page(struct protection_domain *dom, 
	return 0;

}



#ifdef CONFIG_IOMMU_API

static void iommu_unmap_page(struct protection_domain *dom,

			     unsigned long bus_addr)

{

	u64 *pte;



	pte = &dom->pt_root[IOMMU_PTE_L2_INDEX(bus_addr)];



	if (!IOMMU_PTE_PRESENT(*pte))

		return;



	pte = IOMMU_PTE_PAGE(*pte);

	pte = &pte[IOMMU_PTE_L1_INDEX(bus_addr)];



	if (!IOMMU_PTE_PRESENT(*pte))

		return;



	pte = IOMMU_PTE_PAGE(*pte);

	pte = &pte[IOMMU_PTE_L1_INDEX(bus_addr)];



	*pte = 0;

}

#endif



/*

 * This function checks if a specific unity mapping entry is needed for

 * this specific IOMMU.
@@ -1747,4 +1771,21 @@ static int amd_iommu_map_range(struct iommu_domain *dom, 
	return 0;

}



static void amd_iommu_unmap_range(struct iommu_domain *dom,

				  unsigned long iova, size_t size)

{



	struct protection_domain *domain = dom->priv;

	unsigned long i,  npages = iommu_num_pages(iova, size, PAGE_SIZE);



	iova  &= PAGE_MASK;



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

		iommu_unmap_page(domain, iova);

		iova  += PAGE_SIZE;

	}



	iommu_flush_domain(domain->id);

}



#endif