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authorGreg Kurz <gkurz@linux.vnet.ibm.com>2017-02-22 11:56:53 +0100
committerDavid Gibson <david@gibson.dropbear.id.au>2017-03-01 11:23:39 +1100
commita8eeafda1930f49e2080e66b7a5ef493564838d1 (patch)
tree8d3025a3c4044c342d60708bebccdff9c3e0cb65 /hw/pci
parentb63d043418f76229a3637842cc1777280b695df1 (diff)
downloadqemu-a8eeafda1930f49e2080e66b7a5ef493564838d1.tar.gz
spapr/pci: populate PCI DT in reverse order
Since commit 1d2d974244c6 "spapr_pci: enumerate and add PCI device tree", QEMU populates the PCI device tree in the opposite order compared to SLOF. Before 1d2d974244c6: Populating /pci@800000020000000 00 0000 (D) : 1af4 1000 virtio [ net ] 00 0800 (D) : 1af4 1001 virtio [ block ] 00 1000 (D) : 1af4 1009 virtio [ network ] Populating /pci@800000020000000/unknown-legacy-device@2 7e5294b8 : /pci@800000020000000 7e52b998 : |-- ethernet@0 7e52c0c8 : |-- scsi@1 7e52c7e8 : +-- unknown-legacy-device@2 ok Since 1d2d974244c6: Populating /pci@800000020000000 00 1000 (D) : 1af4 1009 virtio [ network ] Populating /pci@800000020000000/unknown-legacy-device@2 00 0800 (D) : 1af4 1001 virtio [ block ] 00 0000 (D) : 1af4 1000 virtio [ net ] 7e5e8118 : /pci@800000020000000 7e5ea6a0 : |-- unknown-legacy-device@2 7e5eadb8 : |-- scsi@1 7e5eb4d8 : +-- ethernet@0 ok This behaviour change is not actually a bug since no assumptions should be made on DT ordering. But it has no real justification either, other than being the consequence of the way fdt_add_subnode() inserts new elements to the front of the FDT rather than adding them to the tail. This patch reverts to the historical SLOF ordering by walking PCI devices in reverse order. This reconciles pseries with x86 machine types behavior. It is expected to make things easier when porting existing applications to power. Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com> Tested-by: Thomas Huth <thuth@redhat.com> Reviewed-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com> (slight update to the changelog) Signed-off-by: Greg Kurz <groug@kaod.org> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Diffstat (limited to 'hw/pci')
-rw-r--r--hw/pci/pci.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index a563555e7d..273f1e4602 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -1530,6 +1530,34 @@ static const pci_class_desc pci_class_descriptions[] =
{ 0, NULL}
};
+static void pci_for_each_device_under_bus_reverse(PCIBus *bus,
+ void (*fn)(PCIBus *b,
+ PCIDevice *d,
+ void *opaque),
+ void *opaque)
+{
+ PCIDevice *d;
+ int devfn;
+
+ for (devfn = 0; devfn < ARRAY_SIZE(bus->devices); devfn++) {
+ d = bus->devices[ARRAY_SIZE(bus->devices) - 1 - devfn];
+ if (d) {
+ fn(bus, d, opaque);
+ }
+ }
+}
+
+void pci_for_each_device_reverse(PCIBus *bus, int bus_num,
+ void (*fn)(PCIBus *b, PCIDevice *d, void *opaque),
+ void *opaque)
+{
+ bus = pci_find_bus_nr(bus, bus_num);
+
+ if (bus) {
+ pci_for_each_device_under_bus_reverse(bus, fn, opaque);
+ }
+}
+
static void pci_for_each_device_under_bus(PCIBus *bus,
void (*fn)(PCIBus *b, PCIDevice *d,
void *opaque),