Author: andrew
Date: Thu Aug 25 10:53:03 2016
New Revision: 304799
URL: https://svnweb.freebsd.org/changeset/base/304799
Log:
Map coherent memory in a non-coherent dma tag as uncached. This is similar
to what the 32-bit arm code does, with the exception that it always assumes
the tag is non-coherent.
Tested by: jmcneill
Obtained from: ABT Systems Ltd
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Modified:
head/sys/arm64/arm64/busdma_bounce.c
Modified: head/sys/arm64/arm64/busdma_bounce.c
==============================================================================
--- head/sys/arm64/arm64/busdma_bounce.c Thu Aug 25 10:29:41 2016
(r304798)
+++ head/sys/arm64/arm64/busdma_bounce.c Thu Aug 25 10:53:03 2016
(r304799)
@@ -438,6 +438,13 @@ bounce_bus_dmamem_alloc(bus_dma_tag_t dm
mflags |= M_ZERO;
if (flags & BUS_DMA_NOCACHE)
attr = VM_MEMATTR_UNCACHEABLE;
+ else if ((flags & BUS_DMA_COHERENT) != 0 &&
+ (dmat->bounce_flags & BF_COHERENT) == 0)
+ /*
+ * If we have a non-coherent tag, and are trying to allocate
+ * a coherent block of memory it needs to be uncached.
+ */
+ attr = VM_MEMATTR_UNCACHEABLE;
else
attr = VM_MEMATTR_DEFAULT;
_______________________________________________
svn-src-all@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/svn-src-all
To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
