Author: nwhitehorn
Date: Mon Sep 16 15:10:11 2013
New Revision: 255615
URL: http://svnweb.freebsd.org/changeset/base/255615
Log:
Add a loader tunable to use only device tree-provided PCI devices. This is
needed on some more fragile systems to avoid machine checks when blindly
probing the PCI bus. Also reduce ofw_pcibus's priority slightly so that it
can be overridden.
Approved by: re (gjb)
Modified:
head/sys/powerpc/ofw/ofw_pcibus.c
Modified: head/sys/powerpc/ofw/ofw_pcibus.c
==============================================================================
--- head/sys/powerpc/ofw/ofw_pcibus.c Mon Sep 16 14:32:56 2013
(r255614)
+++ head/sys/powerpc/ofw/ofw_pcibus.c Mon Sep 16 15:10:11 2013
(r255615)
@@ -101,6 +101,9 @@ DRIVER_MODULE(ofw_pcibus, pcib, ofw_pcib
MODULE_VERSION(ofw_pcibus, 1);
MODULE_DEPEND(ofw_pcibus, pci, 1, 1, 1);
+static int ofw_devices_only = 0;
+TUNABLE_INT("hw.pci.ofw_devices_only", &ofw_devices_only);
+
static int
ofw_pcibus_probe(device_t dev)
{
@@ -109,7 +112,7 @@ ofw_pcibus_probe(device_t dev)
return (ENXIO);
device_set_desc(dev, "OFW PCI bus");
- return (0);
+ return (BUS_PROBE_DEFAULT);
}
static int
@@ -137,7 +140,8 @@ ofw_pcibus_attach(device_t dev)
* functions on multi-function cards.
*/
- ofw_pcibus_enum_bus(dev, domain, busno);
+ if (!ofw_devices_only)
+ ofw_pcibus_enum_bus(dev, domain, busno);
return (bus_generic_attach(dev));
}
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