[src/trunk]: src/sys/arch/x86/pci Use 64-bit DMA, if it is available.

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

details:   https://anonhg.NetBSD.org/src/rev/45db05a53d72
branches:  trunk
changeset: 796812:45db05a53d72
user:      hikaru <hikaru%NetBSD.org@localhost>
date:      Thu Jun 19 13:20:28 2014 +0000

description:
Use 64-bit DMA, if it is available.
This fixes null packet handling on guest which have memory over than 3GB.

diffstat:

 sys/arch/x86/pci/if_vmx.c |  9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diffs (30 lines):

diff -r 283c781b8993 -r 45db05a53d72 sys/arch/x86/pci/if_vmx.c
--- a/sys/arch/x86/pci/if_vmx.c Thu Jun 19 13:20:13 2014 +0000
+++ b/sys/arch/x86/pci/if_vmx.c Thu Jun 19 13:20:28 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_vmx.c,v 1.2 2014/06/19 13:16:29 hikaru Exp $        */
+/*     $NetBSD: if_vmx.c,v 1.3 2014/06/19 13:20:28 hikaru Exp $        */
 /*     $OpenBSD: if_vmx.c,v 1.16 2014/01/22 06:04:17 brad Exp $        */
 
 /*
@@ -18,7 +18,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_vmx.c,v 1.2 2014/06/19 13:16:29 hikaru Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_vmx.c,v 1.3 2014/06/19 13:20:28 hikaru Exp $");
 
 #include <sys/param.h>
 #include <sys/bus.h>
@@ -238,7 +238,10 @@
        preg |= PCI_COMMAND_MASTER_ENABLE;
        pci_conf_write(pa->pa_pc, pa->pa_tag, PCI_COMMAND_STATUS_REG, preg);
 
-       sc->sc_dmat = pa->pa_dmat;
+       if (pci_dma64_available(pa))
+               sc->sc_dmat = pa->pa_dmat64;
+       else
+               sc->sc_dmat = pa->pa_dmat;
        if (vmxnet3_dma_init(sc)) {
                aprint_error_dev(sc->sc_dev, "failed to setup DMA\n");
                return;