PCI: Add support for PASID capability
Devices supporting Process Address Space Identifiers
(PASIDs) can use an IOMMU to access multiple IO address
spaces at the same time. A PCIe device indicates support for
this feature by implementing the PASID capability. This
patch adds support for the capability to the Linux kernel.
Reviewed-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/include/linux/pci_regs.h b/include/linux/pci_regs.h
index 7fc32af..b5d9657 100644
--- a/include/linux/pci_regs.h
+++ b/include/linux/pci_regs.h
@@ -675,6 +675,14 @@
#define PCI_PRI_MAX_REQ_OFF 0x08 /* Cap offset for max reqs supported */
#define PCI_PRI_ALLOC_REQ_OFF 0x0c /* Cap offset for max reqs allowed */
+/* PASID capability */
+#define PCI_PASID_CAP 0x1b /* PASID capability ID */
+#define PCI_PASID_CAP_OFF 0x04 /* PASID feature register */
+#define PCI_PASID_CONTROL_OFF 0x06 /* PASID control register */
+#define PCI_PASID_ENABLE 0x01 /* Enable/Supported bit */
+#define PCI_PASID_EXEC 0x02 /* Exec permissions Enable/Supported */
+#define PCI_PASID_PRIV 0x04 /* Priviledge Mode Enable/Support */
+
/* Single Root I/O Virtualization */
#define PCI_SRIOV_CAP 0x04 /* SR-IOV Capabilities */
#define PCI_SRIOV_CAP_VFM 0x01 /* VF Migration Capable */