Commit ce48fa93 authored by Maarten Maathuis's avatar Maarten Maathuis Committed by Ben Skeggs
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drm/nv50: add a memory barrier to pushbuf submission 



- This is useful for vram pushbuffers that are write combined.
- pre-nv50 has one too (in WRITE_PUT).

Signed-off-by: default avatarMaarten Maathuis <madman2003@gmail.com>
Signed-off-by: default avatarBen Skeggs <bskeggs@redhat.com>
parent 81441570

drivers/gpu/drm/nouveau/nouveau_dma.c

+5 −0
Original line number Diff line number Diff line
@@ -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--;

}