[src/trunk]: src/sys/arch/arm/arm32 In bus_dmamap_sync(), we can no longer re...

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

details:   https://anonhg.NetBSD.org/src/rev/82f2d8140d53
branches:  trunk
changeset: 554593:82f2d8140d53
user:      scw <scw%NetBSD.org@localhost>
date:      Thu Oct 30 08:44:13 2003 +0000

description:
In bus_dmamap_sync(), we can no longer rely on the data cache being
flushed on every context switch as an indicator that a mapping is
not resident in the cache.

Instead, used the per-pmap flag maintained by the cpu_switch/pmap code.

diffstat:

 sys/arch/arm/arm32/bus_dma.c |  15 ++++++---------
 1 files changed, 6 insertions(+), 9 deletions(-)

diffs (38 lines):

diff -r 9477f55888b6 -r 82f2d8140d53 sys/arch/arm/arm32/bus_dma.c
--- a/sys/arch/arm/arm32/bus_dma.c      Thu Oct 30 08:25:19 2003 +0000
+++ b/sys/arch/arm/arm32/bus_dma.c      Thu Oct 30 08:44:13 2003 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: bus_dma.c,v 1.37 2003/10/29 05:03:41 mycroft Exp $     */
+/*     $NetBSD: bus_dma.c,v 1.38 2003/10/30 08:44:13 scw Exp $ */
 
 /*-
  * Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc.
@@ -40,7 +40,7 @@
 #define _ARM32_BUS_DMA_PRIVATE
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: bus_dma.c,v 1.37 2003/10/29 05:03:41 mycroft Exp $");
+__KERNEL_RCSID(0, "$NetBSD: bus_dma.c,v 1.38 2003/10/30 08:44:13 scw Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -618,15 +618,12 @@
        }
 
        /*
-        * If the mapping is not the kernel's and also not the
-        * current process's (XXX actually, vmspace), then we
-        * don't have anything to do, since the cache is Wb-Inv'd
-        * on context switch.
-        *
-        * XXX REVISIT WHEN WE DO FCSE!
+        * If the mapping belongs to a non-kernel vmspace, and the
+        * vmspace has not been active since the last time a full
+        * cache flush was performed, we don't need to do anything.
         */
        if (__predict_false(map->_dm_proc != NULL &&
-           curlwp != NULL && map->_dm_proc != curproc))
+           map->_dm_proc->p_vmspace->vm_map.pmap->pm_cstate.cs_cache_d == 0))
                return;
 
        switch (map->_dm_buftype) {