PCI: Trace device node from PCI device

When nvLink and nVida's GPU included in PCI topology, we have the
emulated PCI devices to represent nvLinks, which is associated with
the real GPU PCI device with help of device-tree. The patch introduces
one more field "dn" to "struct pci_device" to make the job easier.

The patch also adds one more PHB operations "device_node_fixup", which
is to be called when populating PCI device node so that we have chance
to link the emulated PCI device and the real GPU device through device
tree.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/core/pci.c b/core/pci.c
index a8015cb..22d38b5 100644
--- a/core/pci.c
+++ b/core/pci.c
@@ -1342,7 +1342,7 @@ static void pci_add_one_node(struct phb *phb, struct pci_device *pd,
 	else
 		snprintf(name, MAX_NAME - 1, "%s@%x",
 			 cname, (pd->bdfn >> 3) & 0x1f);
-	np = dt_new(parent_node, name);
+	pd->dn = np = dt_new(parent_node, name);
 
 	/* XXX FIXME: make proper "compatible" properties */
 	if (pci_has_cap(pd, PCI_CFG_CAP_ID_EXP, false)) {
@@ -1386,9 +1386,12 @@ static void pci_add_one_node(struct phb *phb, struct pci_device *pd,
 	reg[1] = reg[2] = reg[3] = reg[4] = 0;
 	dt_add_property(np, "reg", reg, sizeof(reg));
 
+	/* Device node fixup */
+	if (phb->ops->device_node_fixup)
+		phb->ops->device_node_fixup(phb, pd);
+
 	/* Print summary info about the device */
 	pci_print_summary_line(phb, pd, np, rev_class, cname);
-
 	if (!pd->is_bridge)
 		return;