From 61363c1474b146114fb4c5e5af2908c8afcf1c5e Mon Sep 17 00:00:00 2001 From: Kuppuswamy Sathyanarayanan Date: Tue, 19 Feb 2019 11:06:10 -0800 Subject: iommu/vt-d: Enable ATS only if the device uses page aligned address. As per Intel vt-d specification, Rev 3.0 (section 7.5.1.1, title "Page Request Descriptor"), Intel IOMMU page request descriptor only uses bits[63:12] of the page address. Hence Intel IOMMU driver would only permit devices that advertise they would only send Page Aligned Requests to participate in ATS service. Cc: Ashok Raj Cc: Jacob Pan Cc: Keith Busch Suggested-by: Ashok Raj Signed-off-by: Kuppuswamy Sathyanarayanan Signed-off-by: Joerg Roedel --- drivers/iommu/intel-iommu.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/iommu') diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index a341927d9536..00f46021d690 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -1408,6 +1408,7 @@ static void iommu_enable_dev_iotlb(struct device_domain_info *info) info->pri_enabled = 1; #endif if (!pdev->untrusted && info->ats_supported && + pci_ats_page_aligned(pdev) && !pci_enable_ats(pdev, VTD_PAGE_SHIFT)) { info->ats_enabled = 1; domain_update_iotlb(info->domain); -- cgit v1.2.3