[Mesa-dev] [PATCH] radeonsi: Disable asynchronous DMA except for PIPE_BUFFER

Michel Dänzer michel at daenzer.net
Wed Nov 12 22:52:48 PST 2014

From: Michel Dänzer <michel.daenzer at amd.com>

Using the asynchronous DMA engine for multi-dimensional operations seems
to cause random GPU lockups for various people. While the root cause for
this might need to be fixed in the kernel, let's disable it for now.

Before re-enabling this, please make sure you can hit all newly enabled
paths in your testing, preferably with both piglit and real world apps,
and get in touch with people on the bug reports below for stability

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=85647
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=83500
Cc: mesa-stable at lists.freedesktop.org
Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
 src/gallium/drivers/radeonsi/si_dma.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/gallium/drivers/radeonsi/si_dma.c b/src/gallium/drivers/radeonsi/si_dma.c
index b1bd5e7..1d3b524 100644
--- a/src/gallium/drivers/radeonsi/si_dma.c
+++ b/src/gallium/drivers/radeonsi/si_dma.c
@@ -250,6 +250,9 @@ void si_dma_copy(struct pipe_context *ctx,
+	/* XXX: The paths below cause lockups for some */
+	goto fallback;
 	if (src->format != dst->format || src_box->depth > 1 ||
 	    rdst->dirty_level_mask != 0 ||
 	    rdst->cmask.size || rdst->fmask.size ||

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