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Commit d794dc9b authored by David Woodhouse's avatar David Woodhouse
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intel-iommu: Make dma_pte_free_pagetable() take pfns as argument 



With some cleanup of intel_unmap_page(), intel_unmap_sg() and
vm_domain_exit() to no longer play with 64-bit addresses.

Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
parent 6660c63a

drivers/pci/intel-iommu.c

+28 −40
Original line number Diff line number Diff line
@@ -796,11 +796,10 @@ static void dma_pte_clear_range(struct dmar_domain *domain, 


/* free page table pages. last level pte should already be cleared */

static void dma_pte_free_pagetable(struct dmar_domain *domain,

	u64 start, u64 end)

				   unsigned long start_pfn,

				   unsigned long last_pfn)

{

	int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT;

	unsigned long start_pfn = start >> VTD_PAGE_SHIFT;

	unsigned long last_pfn = (end-1) >> VTD_PAGE_SHIFT;

	struct dma_pte *pte;

	int total = agaw_to_level(domain->agaw);

	int level;
@@ -832,7 +831,7 @@ static void dma_pte_free_pagetable(struct dmar_domain *domain, 
		level++;

	}

	/* free pgd */

	if (start == 0 && last_pfn == DOMAIN_MAX_PFN(domain->gaw)) {

	if (start_pfn == 0 && last_pfn == DOMAIN_MAX_PFN(domain->gaw)) {

		free_pgtable_page(domain->pgd);

		domain->pgd = NULL;

	}
@@ -1416,7 +1415,6 @@ static void domain_exit(struct dmar_domain *domain) 
{

	struct dmar_drhd_unit *drhd;

	struct intel_iommu *iommu;

	u64 end;



	/* Domain 0 is reserved, so dont process it */

	if (!domain)
@@ -1425,14 +1423,12 @@ static void domain_exit(struct dmar_domain *domain) 
	domain_remove_dev_info(domain);

	/* destroy iovas */

	put_iova_domain(&domain->iovad);

	end = DOMAIN_MAX_ADDR(domain->gaw);

	end = end & (~PAGE_MASK);



	/* clear ptes */

	dma_pte_clear_range(domain, 0, DOMAIN_MAX_PFN(domain->gaw));



	/* free page tables */

	dma_pte_free_pagetable(domain, 0, end);

	dma_pte_free_pagetable(domain, 0, DOMAIN_MAX_PFN(domain->gaw));



	for_each_active_iommu(iommu, drhd)

		if (test_bit(iommu->seq_id, &domain->iommu_bmp))
@@ -2601,7 +2597,7 @@ static void intel_unmap_page(struct device *dev, dma_addr_t dev_addr, 
{

	struct pci_dev *pdev = to_pci_dev(dev);

	struct dmar_domain *domain;

	unsigned long start_addr;

	unsigned long start_pfn, last_pfn;

	struct iova *iova;

	struct intel_iommu *iommu;
@@ -2617,20 +2613,22 @@ static void intel_unmap_page(struct device *dev, dma_addr_t dev_addr, 
	if (!iova)

		return;



	start_addr = iova->pfn_lo << PAGE_SHIFT;

	size = aligned_size((u64)dev_addr, size);

	start_pfn = mm_to_dma_pfn(iova->pfn_lo);

	last_pfn = mm_to_dma_pfn(iova->pfn_hi + 1) - 1;



	pr_debug("Device %s unmapping: %zx@%llx\n",

		pci_name(pdev), size, (unsigned long long)start_addr);

	pr_debug("Device %s unmapping: pfn %lx-%lx\n",

		 pci_name(pdev), start_pfn, last_pfn);



	/*  clear the whole page */

	dma_pte_clear_range(domain, start_addr >> VTD_PAGE_SHIFT,

			    (start_addr + size - 1) >> VTD_PAGE_SHIFT);

	dma_pte_clear_range(domain, start_pfn, last_pfn);



	/* free page tables */

	dma_pte_free_pagetable(domain, start_addr, start_addr + size);

	dma_pte_free_pagetable(domain, start_pfn, last_pfn);



	if (intel_iommu_strict) {

		iommu_flush_iotlb_psi(iommu, domain->id, start_addr,

				      size >> VTD_PAGE_SHIFT);

		iommu_flush_iotlb_psi(iommu, domain->id,

				      start_pfn << VTD_PAGE_SHIFT,

				      last_pfn - start_pfn + 1);

		/* free iova */

		__free_iova(&domain->iovad, iova);

	} else {
@@ -2688,14 +2686,10 @@ static void intel_unmap_sg(struct device *hwdev, struct scatterlist *sglist, 
			   int nelems, enum dma_data_direction dir,

			   struct dma_attrs *attrs)

{

	int i;

	struct pci_dev *pdev = to_pci_dev(hwdev);

	struct dmar_domain *domain;

	unsigned long start_addr;

	unsigned long start_pfn, last_pfn;

	struct iova *iova;

	size_t size = 0;

	phys_addr_t addr;

	struct scatterlist *sg;

	struct intel_iommu *iommu;



	if (iommu_no_mapping(pdev))
@@ -2709,21 +2703,19 @@ static void intel_unmap_sg(struct device *hwdev, struct scatterlist *sglist, 
	iova = find_iova(&domain->iovad, IOVA_PFN(sglist[0].dma_address));

	if (!iova)

		return;

	for_each_sg(sglist, sg, nelems, i) {

		addr = page_to_phys(sg_page(sg)) + sg->offset;

		size += aligned_size((u64)addr, sg->length);

	}



	start_addr = iova->pfn_lo << PAGE_SHIFT;

	start_pfn = mm_to_dma_pfn(iova->pfn_lo);

	last_pfn = mm_to_dma_pfn(iova->pfn_hi + 1) - 1;



	/*  clear the whole page */

	dma_pte_clear_range(domain, start_addr >> VTD_PAGE_SHIFT,

			    (start_addr + size - 1) >> VTD_PAGE_SHIFT);

	dma_pte_clear_range(domain, start_pfn, last_pfn);



	/* free page tables */

	dma_pte_free_pagetable(domain, start_addr, start_addr + size);

	dma_pte_free_pagetable(domain, start_pfn, last_pfn);



	iommu_flush_iotlb_psi(iommu, domain->id, start_addr,

			      size >> VTD_PAGE_SHIFT);

	iommu_flush_iotlb_psi(iommu, domain->id,

			      start_pfn << VTD_PAGE_SHIFT,

			      (last_pfn - start_pfn + 1));



	/* free iova */

	__free_iova(&domain->iovad, iova);
@@ -2804,8 +2796,8 @@ static int intel_map_sg(struct device *hwdev, struct scatterlist *sglist, int ne 
					    start_addr >> VTD_PAGE_SHIFT,

					    (start_addr + offset - 1) >> VTD_PAGE_SHIFT);

			/* free page tables */

			dma_pte_free_pagetable(domain, start_addr,

				  start_addr + offset);

			dma_pte_free_pagetable(domain, start_addr >> VTD_PAGE_SHIFT,

					       (start_addr + offset - 1) >> VTD_PAGE_SHIFT);

			/* free iova */

			__free_iova(&domain->iovad, iova);

			return 0;
@@ -3378,8 +3370,6 @@ static void iommu_free_vm_domain(struct dmar_domain *domain) 


static void vm_domain_exit(struct dmar_domain *domain)

{

	u64 end;



	/* Domain 0 is reserved, so dont process it */

	if (!domain)

		return;
@@ -3387,14 +3377,12 @@ static void vm_domain_exit(struct dmar_domain *domain) 
	vm_domain_remove_all_dev_info(domain);

	/* destroy iovas */

	put_iova_domain(&domain->iovad);

	end = DOMAIN_MAX_ADDR(domain->gaw);

	end = end & (~VTD_PAGE_MASK);



	/* clear ptes */

	dma_pte_clear_range(domain, 0, DOMAIN_MAX_PFN(domain->gaw));



	/* free page tables */

	dma_pte_free_pagetable(domain, 0, end);

	dma_pte_free_pagetable(domain, 0, DOMAIN_MAX_PFN(domain->gaw));



	iommu_free_vm_domain(domain);

	free_domain_mem(domain);