Added function pciSysfsFile to enable access to the PCI SYSFS files.

src/util/pci.c

 /*
- * Copyright (C) 2009-2011 Red Hat, Inc.
+ * Copyright (C) 2009-2012 Red Hat, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -2026,6 +2026,22 @@ out:
     return ret;
 }
 
+/*
+ * Returns a path to the PCI sysfs file given the BDF of the PCI function
+ */
+
+int
+pciSysfsFile(char *pciDeviceName, char **pci_sysfs_device_link)
+{
+    if (virAsprintf(pci_sysfs_device_link, PCI_SYSFS "devices/%s",
+                    pciDeviceName) < 0) {
+        virReportOOMError();
+        return -1;
+    }
+
+    return 0;
+}
+
 /*
  * Returns the network device name of a pci device
  */

src/util/pci.h

 /*
- * Copyright (C) 2009, 2011 Red Hat, Inc.
+ * Copyright (C) 2009, 2011-2012 Red Hat, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -109,4 +109,7 @@ int pciGetVirtualFunctionIndex(const char *pf_sysfs_device_link,
 
 int pciDeviceNetName(char *device_link_sysfs_path, char **netname);
 
+int pciSysfsFile(char *pciDeviceName, char **pci_sysfs_device_link)
+    ATTRIBUTE_RETURN_CHECK;
+
 #endif /* __VIR_PCI_H__ */