Merge branch 'remotes/lorenzo/pci/vmd'

- Use Shadow MEMBAR registers for QEMU/KVM guests (Jon Derrick)

* remotes/lorenzo/pci/vmd:
  PCI: vmd: Use Shadow MEMBAR registers for QEMU/KVM guests

Author: bjorn-helgaas

drivers/pci/controller/vmd.c

@@ -40,13 +40,19 @@ enum vmd_features {
 	 * membars, in order to allow proper address translation during
 	 * resource assignment to enable guest virtualization
 	 */
-	VMD_FEAT_HAS_MEMBAR_SHADOW	= (1 << 0),
+	VMD_FEAT_HAS_MEMBAR_SHADOW		= (1 << 0),
 
 	/*
 	 * Device may provide root port configuration information which limits
 	 * bus numbering
 	 */
-	VMD_FEAT_HAS_BUS_RESTRICTIONS	= (1 << 1),
+	VMD_FEAT_HAS_BUS_RESTRICTIONS		= (1 << 1),
+
+	/*
+	 * Device contains physical location shadow registers in
+	 * vendor-specific capability space
+	 */
+	VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP	= (1 << 2),
 };
 
 /*
@@ -454,6 +460,28 @@ static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features)
 		}
 	}
 
+	if (features & VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP) {
+		int pos = pci_find_capability(vmd->dev, PCI_CAP_ID_VNDR);
+		u32 reg, regu;
+
+		pci_read_config_dword(vmd->dev, pos + 4, &reg);
+
+		/* "SHDW" */
+		if (pos && reg == 0x53484457) {
+			pci_read_config_dword(vmd->dev, pos + 8, &reg);
+			pci_read_config_dword(vmd->dev, pos + 12, &regu);
+			offset[0] = vmd->dev->resource[VMD_MEMBAR1].start -
+					(((u64) regu << 32 | reg) &
+					 PCI_BASE_ADDRESS_MEM_MASK);
+
+			pci_read_config_dword(vmd->dev, pos + 16, &reg);
+			pci_read_config_dword(vmd->dev, pos + 20, &regu);
+			offset[1] = vmd->dev->resource[VMD_MEMBAR2].start -
+					(((u64) regu << 32 | reg) &
+					 PCI_BASE_ADDRESS_MEM_MASK);
+		}
+	}
+
 	/*
 	 * Certain VMD devices may have a root port configuration option which
 	 * limits the bus range to between 0-127, 128-255, or 224-255
@@ -716,16 +744,20 @@ static int vmd_resume(struct device *dev)
 static SIMPLE_DEV_PM_OPS(vmd_dev_pm_ops, vmd_suspend, vmd_resume);
 
 static const struct pci_device_id vmd_ids[] = {
-	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_VMD_201D),},
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_VMD_201D),
+		.driver_data = VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP,},
 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_VMD_28C0),
 		.driver_data = VMD_FEAT_HAS_MEMBAR_SHADOW |
 				VMD_FEAT_HAS_BUS_RESTRICTIONS,},
 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x467f),
-		.driver_data = VMD_FEAT_HAS_BUS_RESTRICTIONS,},
+		.driver_data = VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP |
+				VMD_FEAT_HAS_BUS_RESTRICTIONS,},
 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x4c3d),
-		.driver_data = VMD_FEAT_HAS_BUS_RESTRICTIONS,},
+		.driver_data = VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP |
+				VMD_FEAT_HAS_BUS_RESTRICTIONS,},
 	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_VMD_9A0B),
-		.driver_data = VMD_FEAT_HAS_BUS_RESTRICTIONS,},
+		.driver_data = VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP |
+				VMD_FEAT_HAS_BUS_RESTRICTIONS,},
 	{0,}
 };
 MODULE_DEVICE_TABLE(pci, vmd_ids);