Merge git://git.infradead.org/intel-iommu

Pull intel iommu updates from David Woodhouse:
 "This adds "Shared Virtual Memory" (aka PASID support) for the Intel
  IOMMU.  This allows devices to do DMA using process address space,
  translated through the normal CPU page tables for the relevant mm.

  With corresponding support added to the i915 driver, this has been
  tested with the graphics device on Skylake.  We don't have the
  required TLP support in our PCIe root ports for supporting discrete
  devices yet, so it's only integrated devices that can do it so far"

* git://git.infradead.org/intel-iommu: (23 commits)
  iommu/vt-d: Fix rwxp flags in SVM device fault callback
  iommu/vt-d: Expose struct svm_dev_ops without CONFIG_INTEL_IOMMU_SVM
  iommu/vt-d: Clean up pasid_enabled() and ecs_enabled() dependencies
  iommu/vt-d: Handle Caching Mode implementations of SVM
  iommu/vt-d: Fix SVM IOTLB flush handling
  iommu/vt-d: Use dev_err(..) in intel_svm_device_to_iommu(..)
  iommu/vt-d: fix a loop in prq_event_thread()
  iommu/vt-d: Fix IOTLB flushing for global pages
  iommu/vt-d: Fix address shifting in page request handler
  iommu/vt-d: shift wrapping bug in prq_event_thread()
  iommu/vt-d: Fix NULL pointer dereference in page request error case
  iommu/vt-d: Implement SVM_FLAG_SUPERVISOR_MODE for kernel access
  iommu/vt-d: Implement SVM_FLAG_PRIVATE_PASID to allocate unique PASIDs
  iommu/vt-d: Add callback to device driver on page faults
  iommu/vt-d: Implement page request handling
  iommu/vt-d: Generalise DMAR MSI setup to allow for page request events
  iommu/vt-d: Implement deferred invalidate for SVM
  iommu/vt-d: Add basic SVM PASID support
  iommu/vt-d: Always enable PASID/PRI PCI capabilities before ATS
  iommu/vt-d: Add initial support for PASID tables
  ...

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index cbe6a890a93a..e1738f666417 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -134,6 +134,16 @@ config INTEL_IOMMU
 	  and include PCI device scope covered by these DMA
 	  remapping devices.
 
+config INTEL_IOMMU_SVM
+	bool "Support for Shared Virtual Memory with Intel IOMMU"
+	depends on INTEL_IOMMU && X86
+	select PCI_PASID
+	select MMU_NOTIFIER
+	help
+	  Shared Virtual Memory (SVM) provides a facility for devices
+	  to access DMA resources through process address space by
+	  means of a Process Address Space ID (PASID).
+
 config INTEL_IOMMU_DEFAULT_ON
 	def_bool y
 	prompt "Enable Intel DMA Remapping Devices by default"