- 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, 1 insertions, 0 deletions

diff --git a/sys/dev/cardbus/cardbus.c b/sys/dev/cardbus/cardbus.c
index ea75770..608c1fe 100644
--- a/sys/dev/cardbus/cardbus.c
+++ b/sys/dev/cardbus/cardbus.c
@@ -316,6 +316,7 @@ static device_method_t cardbus_methods[] = {
 	DEVMETHOD(device_resume,	cardbus_resume),
 
 	/* Bus interface */
+	DEVMETHOD(bus_get_dma_tag,	bus_generic_get_dma_tag),
 	DEVMETHOD(bus_read_ivar,	cardbus_read_ivar),
 	DEVMETHOD(bus_driver_added,	cardbus_driver_added),