- Add a bus_dma tag to each PCI bus that is a child of a Host-PCI bridge.

  The tag enforces a single restriction that all DMA transactions must not
  cross a 4GB boundary.  Note that while this restriction technically only
  applies to PCI-express, this change applies it to all PCI devices as it
  is simpler to implement that way and errs on the side of caution.
- Add a softc structure for PCI bus devices to hold the bus_dma tag and
  a new pci_attach_common() routine that performs actions common to the
  attach phase of all PCI bus drivers.  Right now this only consists of
  a bootverbose printf and the allocate of a bus_dma tag if necessary.
- Adjust all PCI bus drivers to allocate a PCI bus softc and to call
  pci_attach_common() from their attach routines.

MFC after:	2 weeks

1 files changed, 6 insertions, 5 deletions

diff --git a/sys/powerpc/ofw/ofw_pcibus.c b/sys/powerpc/ofw/ofw_pcibus.c
index 9618e4c..c611bb5 100644
--- a/sys/powerpc/ofw/ofw_pcibus.c
+++ b/sys/powerpc/ofw/ofw_pcibus.c
@@ -95,8 +95,8 @@ struct ofw_pcibus_devinfo {
 
 static devclass_t pci_devclass;
 
-DEFINE_CLASS_1(pci, ofw_pcibus_driver, ofw_pcibus_methods, 1 /* no softc */,
-    pci_driver);
+DEFINE_CLASS_1(pci, ofw_pcibus_driver, ofw_pcibus_methods,
+    sizeof(struct pci_softc), pci_driver);
 DRIVER_MODULE(ofw_pcibus, pcib, ofw_pcibus_driver, pci_devclass, 0, 0);
 MODULE_VERSION(ofw_pcibus, 1);
 MODULE_DEPEND(ofw_pcibus, pci, 1, 1, 1);
@@ -116,12 +116,13 @@ static int
 ofw_pcibus_attach(device_t dev)
 {
 	u_int busno, domain;
+	int error;
 
+	error = pci_attach_common(dev);
+	if (error)
+		return (error);
 	domain = pcib_get_domain(dev);
 	busno = pcib_get_bus(dev);
-	if (bootverbose)
-		device_printf(dev, "domain=%d, physical bus=%d\n",
-		    domain, busno);
 
 	/*
 	 * Attach those children represented in the device tree.