[Xen-devel] [PATCH v2] xen/pci: Try harder to get PXM information for Xen

[Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>]

If the device being added to Xen is not contained in the ACPI table,
walk the PCI device tree to find a parent that is contained in the ACPI
table before finding the PXM information from this device.

Previously, it would try to get a handle for the device, then the
device's bridge, then the physfn.  This changes the order so that it
tries to get a handle for the device, then the physfn, the walks up the
PCI device tree.

Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
---
 drivers/xen/pci.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/xen/pci.c b/drivers/xen/pci.c
index 95ee430..7494dbe 100644
--- a/drivers/xen/pci.c
+++ b/drivers/xen/pci.c
@@ -19,6 +19,7 @@
 
 #include <linux/pci.h>
 #include <linux/acpi.h>
+#include <linux/pci-acpi.h>
 #include <xen/xen.h>
 #include <xen/interface/physdev.h>
 #include <xen/interface/xen.h>
@@ -67,12 +68,22 @@ static int xen_add_device(struct device *dev)
 
 #ifdef CONFIG_ACPI
                handle = ACPI_HANDLE(&pci_dev->dev);
-               if (!handle && pci_dev->bus->bridge)
-                       handle = ACPI_HANDLE(pci_dev->bus->bridge);
 #ifdef CONFIG_PCI_IOV
                if (!handle && pci_dev->is_virtfn)
                        handle = ACPI_HANDLE(physfn->bus->bridge);
 #endif
+               if (!handle) {
+                       /*
+                        * This device was not listed in the ACPI name space at
+                        * all. Try to get acpi handle of parent pci bus.
+                        */
+                       struct pci_bus *pbus;
+                       for (pbus = pci_dev->bus; pbus; pbus = pbus->parent) {
+                               handle = acpi_pci_get_bridge_handle(pbus);
+                               if (handle)
+                                       break;
+                       }
+               }
                if (handle) {
                        acpi_status status;
 
-- 
2.1.0


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