Merge tag 'iommu-updates-v5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu

Pull IOMMU updates from Joerg Roedel:

 - A big cleanup and optimization patch-set for the Tegra GART driver

 - Documentation updates and fixes for the IOMMU-API

 - Support for page request in Intel VT-d scalable mode

 - Intel VT-d dma_[un]map_resource() support

 - Updates to the ATS enabling code for PCI (acked by Bjorn) and Intel
   VT-d to align with the latest version of the ATS spec

 - Relaxed IRQ source checking in the Intel VT-d driver for some aliased
   devices, needed for future devices which send IRQ messages from more
   than on request-ID

 - IRQ remapping driver for Hyper-V

 - Patches to make generic IOVA and IO-Page-Table code usable outside of
   the IOMMU code

 - Various other small fixes and cleanups

* tag 'iommu-updates-v5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: (60 commits)
  iommu/vt-d: Get domain ID before clear pasid entry
  iommu/vt-d: Fix NULL pointer reference in intel_svm_bind_mm()
  iommu/vt-d: Set context field after value initialized
  iommu/vt-d: Disable ATS support on untrusted devices
  iommu/mediatek: Fix semicolon code style issue
  MAINTAINERS: Add Hyper-V IOMMU driver into Hyper-V CORE AND DRIVERS scope
  iommu/hyper-v: Add Hyper-V stub IOMMU driver
  x86/Hyper-V: Set x2apic destination mode to physical when x2apic is available
  PCI/ATS: Add inline to pci_prg_resp_pasid_required()
  iommu/vt-d: Check identity map for hot-added devices
  iommu: Fix IOMMU debugfs fallout
  iommu: Document iommu_ops.is_attach_deferred()
  iommu: Document iommu_ops.iotlb_sync_map()
  iommu/vt-d: Enable ATS only if the device uses page aligned address.
  PCI/ATS: Add pci_ats_page_aligned() interface
  iommu/vt-d: Fix PRI/PASID dependency issue.
  PCI/ATS: Add pci_prg_resp_pasid_required() interface.
  iommu/vt-d: Allow interrupts from the entire bus for aliased devices
  iommu/vt-d: Add helper to set an IRTE to verify only the bus number
  iommu: Fix flush_tlb_all typo
  ...

1 files changed, 57 insertions, 0 deletions

diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c
index 5b78f3b1b918..97c08146534a 100644
--- a/drivers/pci/ats.c
+++ b/drivers/pci/ats.c
@@ -142,6 +142,33 @@ int pci_ats_queue_depth(struct pci_dev *dev)
 }
 EXPORT_SYMBOL_GPL(pci_ats_queue_depth);
 
+/**
+ * pci_ats_page_aligned - Return Page Aligned Request bit status.
+ * @pdev: the PCI device
+ *
+ * Returns 1, if the Untranslated Addresses generated by the device
+ * are always aligned or 0 otherwise.
+ *
+ * Per PCIe spec r4.0, sec 10.5.1.2, if the Page Aligned Request bit
+ * is set, it indicates the Untranslated Addresses generated by the
+ * device are always aligned to a 4096 byte boundary.
+ */
+int pci_ats_page_aligned(struct pci_dev *pdev)
+{
+	u16 cap;
+
+	if (!pdev->ats_cap)
+		return 0;
+
+	pci_read_config_word(pdev, pdev->ats_cap + PCI_ATS_CAP, &cap);
+
+	if (cap & PCI_ATS_CAP_PAGE_ALIGNED)
+		return 1;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(pci_ats_page_aligned);
+
 #ifdef CONFIG_PCI_PRI
 /**
  * pci_enable_pri - Enable PRI capability
@@ -368,6 +395,36 @@ int pci_pasid_features(struct pci_dev *pdev)
 }
 EXPORT_SYMBOL_GPL(pci_pasid_features);
 
+/**
+ * pci_prg_resp_pasid_required - Return PRG Response PASID Required bit
+ *				 status.
+ * @pdev: PCI device structure
+ *
+ * Returns 1 if PASID is required in PRG Response Message, 0 otherwise.
+ *
+ * Even though the PRG response PASID status is read from PRI Status
+ * Register, since this API will mainly be used by PASID users, this
+ * function is defined within #ifdef CONFIG_PCI_PASID instead of
+ * CONFIG_PCI_PRI.
+ */
+int pci_prg_resp_pasid_required(struct pci_dev *pdev)
+{
+	u16 status;
+	int pos;
+
+	pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI);
+	if (!pos)
+		return 0;
+
+	pci_read_config_word(pdev, pos + PCI_PRI_STATUS, &status);
+
+	if (status & PCI_PRI_STATUS_PASID)
+		return 1;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(pci_prg_resp_pasid_required);
+
 #define PASID_NUMBER_SHIFT	8
 #define PASID_NUMBER_MASK	(0x1f << PASID_NUMBER_SHIFT)
 /**