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drm/nv50: add a memory barrier to pushbuf submission
author
Maarten Maathuis
<madman2003@gmail.com>
Thu, 25 Feb 2010 19:00:38 +0000
(20:00 +0100)
committer
Ben Skeggs
<bskeggs@redhat.com>
Wed, 10 Mar 2010 06:07:35 +0000
(16:07 +1000)
- This is useful for vram pushbuffers that are write combined.
- pre-nv50 has one too (in WRITE_PUT).
Signed-off-by: Maarten Maathuis <madman2003@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
drivers/gpu/drm/nouveau/nouveau_dma.c
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diff --git
a/drivers/gpu/drm/nouveau/nouveau_dma.c
b/drivers/gpu/drm/nouveau/nouveau_dma.c
index
c8482a1
..
65c441a
100644
(file)
--- a/
drivers/gpu/drm/nouveau/nouveau_dma.c
+++ b/
drivers/gpu/drm/nouveau/nouveau_dma.c
@@
-190,6
+190,11
@@
nv50_dma_push(struct nouveau_channel *chan, struct nouveau_bo *bo,
nouveau_bo_wr32(pb, ip++, upper_32_bits(offset) | length << 8);
chan->dma.ib_put = (chan->dma.ib_put + 1) & chan->dma.ib_max;
+
+ DRM_MEMORYBARRIER();
+ /* Flush writes. */
+ nouveau_bo_rd32(pb, 0);
+
nvchan_wr32(chan, 0x8c, chan->dma.ib_put);
chan->dma.ib_free--;
}