static char *pcibus_get_dev_path(DeviceState *dev)
{
- PCIDevice *d = (PCIDevice *)dev;
- char path[16];
-
- snprintf(path, sizeof(path), "%04x:%02x:%02x.%x",
- pci_find_domain(d->bus),
- 0 /* TODO: need a persistent path for nested buses.
- * Note: pci_bus_num(d->bus) is not right as it's guest
- * assigned. */,
- PCI_SLOT(d->devfn), PCI_FUNC(d->devfn));
-
- return strdup(path);
+ PCIDevice *d = container_of(dev, PCIDevice, qdev);
+ PCIDevice *t;
+ int slot_depth;
+ /* Path format: Domain:00:Slot.Function:Slot.Function....:Slot.Function.
+ * 00 is added here to make this format compatible with
+ * domain:Bus:Slot.Func for systems without nested PCI bridges.
+ * Slot.Function list specifies the slot and function numbers for all
+ * devices on the path from root to the specific device. */
+ int domain_len = strlen("DDDD:00");
+ int slot_len = strlen(":SS.F");
+ int path_len;
+ char *path, *p;
+
+ /* Calculate # of slots on path between device and root. */;
+ slot_depth = 0;
+ for (t = d; t; t = t->bus->parent_dev) {
+ ++slot_depth;
+ }
+
+ path_len = domain_len + slot_len * slot_depth;
+
+ /* Allocate memory, fill in the terminating null byte. */
+ path = malloc(path_len + 1 /* For '\0' */);
+ path[path_len] = '\0';
+
+ /* First field is the domain. */
+ snprintf(path, domain_len, "%04x:00", pci_find_domain(d->bus));
+
+ /* Fill in slot numbers. We walk up from device to root, so need to print
+ * them in the reverse order, last to first. */
+ p = path + path_len;
+ for (t = d; t; t = t->bus->parent_dev) {
+ p -= slot_len;
+ snprintf(p, slot_len, ":%02x.%x", PCI_SLOT(t->devfn), PCI_FUNC(d->devfn));
+ }
+
+ return path;
}
static int pci_qdev_find_recursive(PCIBus *bus,