[src/trunk]: src/sys/dev/pci use dma64 if available so we don't have do bounc...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/3f6fef9c23b6
branches:  trunk
changeset: 811392:3f6fef9c23b6
user:      christos <christos%NetBSD.org@localhost>
date:      Tue Oct 27 23:08:27 2015 +0000

description:
use dma64 if available so we don't have do bounce around too much.

diffstat:

 sys/dev/pci/virtio.c |  9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diffs (30 lines):

diff -r bc01c1aba620 -r 3f6fef9c23b6 sys/dev/pci/virtio.c
--- a/sys/dev/pci/virtio.c      Tue Oct 27 22:28:56 2015 +0000
+++ b/sys/dev/pci/virtio.c      Tue Oct 27 23:08:27 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: virtio.c,v 1.11 2015/10/26 01:44:48 ozaki-r Exp $      */
+/*     $NetBSD: virtio.c,v 1.12 2015/10/27 23:08:27 christos Exp $     */
 
 /*
  * Copyright (c) 2010 Minoura Makoto.
@@ -26,7 +26,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: virtio.c,v 1.11 2015/10/26 01:44:48 ozaki-r Exp $");
+__KERNEL_RCSID(0, "$NetBSD: virtio.c,v 1.12 2015/10/27 23:08:27 christos Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -341,7 +341,10 @@
        sc->sc_pc = pc;
        sc->sc_tag = tag;
        sc->sc_iot = pa->pa_iot;
-       sc->sc_dmat = pa->pa_dmat;
+       if (pci_dma64_available(pa))
+               sc->sc_dmat = pa->pa_dmat64;
+       else
+               sc->sc_dmat = pa->pa_dmat;
        sc->sc_config_offset = VIRTIO_CONFIG_DEVICE_CONFIG_NOMSI;
 
        if (pci_mapreg_map(pa, PCI_MAPREG_START, PCI_MAPREG_TYPE_IO, 0,