libpci: sysfs: Implement support for PCI_FILL_PARENT

diff --git a/lib/sysfs.c b/lib/sysfs.c
index db54110547edfe47e3f09ccea60014789bc49a7e..735c14445ab8992ce9878820ba7c0bb394e5047b 100644 (file)
--- a/lib/sysfs.c
+++ b/lib/sysfs.c
@@ -381,6 +381,39 @@ sysfs_fill_info(struct pci_dev *d, unsigned int flags)
          d->irq = sysfs_get_value(d, "irq", 1);
       if (want_fill(d, flags, PCI_FILL_BASES | PCI_FILL_ROM_BASE | PCI_FILL_SIZES | PCI_FILL_IO_FLAGS | PCI_FILL_BRIDGE_BASES))
          sysfs_get_resources(d);
+      if (want_fill(d, flags, PCI_FILL_PARENT))
+       {
+         unsigned int domain, bus, dev, func;
+         char *path_abs, *path_canon, *name;
+         char path_rel[OBJNAMELEN];
+         struct pci_dev *parent;
+
+         /* Construct sysfs path for parent device */
+         sysfs_obj_name(d, "..", path_rel);
+         path_abs = realpath(path_rel, NULL);
+         name = path_abs ? strrchr(path_abs, '/') : NULL;
+         name = name ? name+1 : name;
+         parent = NULL;
+
+         if (name && sscanf(name, "%x:%x:%x.%d", &domain, &bus, &dev, &func) == 4 && domain <= 0x7fffffff)
+           for (parent = d->access->devices; parent; parent = parent->next)
+             if (parent->domain == (int)domain && parent->bus == bus && parent->dev == dev && parent->func == func)
+               break;
+
+         if (parent)
+           {
+             /* Check if parsed BDF address from parent sysfs device is really expected PCI device */
+             sysfs_obj_name(parent, ".", path_rel);
+             path_canon = realpath(path_rel, NULL);
+             if (!path_canon || strcmp(path_canon, path_abs) != 0)
+               parent = NULL;
+           }
+
+         if (parent)
+           d->parent = parent;
+         else
+           clear_fill(d, PCI_FILL_PARENT);
+       }
     }
 
   if (want_fill(d, flags, PCI_FILL_PHYS_SLOT))