From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx> 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 its required to enforce that the device will only send page request with page-aligned address. So, this patch set adds support to verify whether the device uses page aligned address before enabling the ATS service in Intel IOMMU driver. Changes since v1: * Fixed issue with PCI_ATS_CAP_PAGE_ALIGNED macro. * Fixed comments. Kuppuswamy Sathyanarayanan (2): PCI/ATS: Add pci_ats_page_aligned() interface iommu/vt-d: Enable ATS only if the device uses page aligned address. drivers/iommu/intel-iommu.c | 1 + drivers/pci/ats.c | 27 +++++++++++++++++++++++++++ include/linux/pci.h | 2 ++ include/uapi/linux/pci_regs.h | 1 + 4 files changed, 31 insertions(+) -- 2.20.1
