commit 93a6423bd84d977bd768a001c6c3868e6a20b63a
author David S. Miller <davem@davemloft.net> Tue Aug 12 23:22:39 2014 -0700
committer David S. Miller <davem@davemloft.net> Wed Aug 13 21:17:49 2014 -0700
tree 5134930d02aaa372ded8a4f78bcd1ceae53dcae6
parent f0094b28f3038936c1985be64dbe83f0e950b671

sparc64: Expand PCI bridge probing debug logging.

Dump the various aspects of the PCI bridge probed at boot time, most
importantly the bridge number ranges, and the ranges property.

This helps diagnose PCI resource issues and other problems by giving
ofpci_debug=1 on the boot command line.

Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/kernel/pci.c

diff --git a/arch/sparc/kernel/pci.c b/arch/sparc/kernel/pci.c
index 539babf..da24fb6 100644
--- a/arch/sparc/kernel/pci.c
+++ b/arch/sparc/kernel/pci.c
@@ -432,6 +432,11 @@
 		       node->full_name);
 		return;
 	}
+
+	if (ofpci_verbose)
+		printk("    Bridge bus range [%u --> %u]\n",
+		       busrange[0], busrange[1]);
+
 	ranges = of_get_property(node, "ranges", &len);
 	simba = 0;
 	if (ranges == NULL) {
@@ -451,6 +456,10 @@
 	pci_bus_insert_busn_res(bus, busrange[0], busrange[1]);
 	bus->bridge_ctl = 0;
 
+	if (ofpci_verbose)
+		printk("    Bridge ranges[%p] simba[%d]\n",
+		       ranges, simba);
+
 	/* parse ranges property, or cook one up by hand for Simba */
 	/* PCI #address-cells == 3 and #size-cells == 2 always */
 	res = &dev->resource[PCI_BRIDGE_RESOURCES];
@@ -468,6 +477,14 @@
 	}
 	i = 1;
 	for (; len >= 32; len -= 32, ranges += 8) {
+		u64 start;
+
+		if (ofpci_verbose)
+			printk("    RAW Range[%08x:%08x:%08x:%08x:%08x:%08x:"
+			       "%08x:%08x]\n",
+			       ranges[0], ranges[1], ranges[2], ranges[3],
+			       ranges[4], ranges[5], ranges[6], ranges[7]);
+
 		flags = pci_parse_of_flags(ranges[0]);
 		size = GET_64BIT(ranges, 6);
 		if (flags == 0 || size == 0)
@@ -490,8 +507,13 @@
 		}
 
 		res->flags = flags;
-		region.start = GET_64BIT(ranges, 1);
+		region.start = start = GET_64BIT(ranges, 1);
 		region.end = region.start + size - 1;
+
+		if (ofpci_verbose)
+			printk("      Using flags[%08x] start[%016llx] size[%016llx]\n",
+			       flags, start, size);
+
 		pcibios_bus_to_resource(dev->bus, res, &region);
 	}
 after_ranges: