Commit e02d586d authored Mar 03, 2016 by Alexandre Courbot Committed by Ben Skeggs Mar 14, 2016

drm/nouveau/instmem/gk20a: add write barrier when releasing DMA object



When using the DMA-API for instmem, we may obtain a write-combined
mapping. For such cases, add a write barrier in
gk20a_instobj_release_dma() to make sure that all writes have reached
memory at this time.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

parent 1733a2ad

drivers/gpu/drm/nouveau/nvkm/subdev/instmem/gk20a.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -228,6 +228,8 @@ gk20a_instobj_release_dma(struct nvkm_memory *memory)
		struct gk20a_instmem *imem = node->imem;
		struct nvkm_ltc *ltc = imem->base.subdev.device->ltc;

		/* in case we got a write-combined mapping */
		wmb();
		nvkm_ltc_invalidate(ltc);
		}