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| author | Alexandre Courbot <acourbot@nvidia.com> | 2015-11-11 17:17:01 +0900 |
|---|---|---|
| committer | Alexandre Courbot <acourbot@nvidia.com> | 2016-01-15 14:32:53 +0900 |
| commit | a6557fa5b4d348eac83533efd7ebfa0bfa40496d (patch) | |
| tree | d2337743c70358522b872b89c511e1aa37271730 | |
| parent | 54a79a667652b511ffaf6f4f206954e91d9e0d8e (diff) | |
| download | nouveau-a6557fa5b4d348eac83533efd7ebfa0bfa40496d.tar.gz | |
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>
| -rw-r--r-- | drm/nouveau/nvkm/subdev/instmem/gk20a.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drm/nouveau/nvkm/subdev/instmem/gk20a.c b/drm/nouveau/nvkm/subdev/instmem/gk20a.c index 4c20fec64..6b8f2a19b 100644 --- a/drm/nouveau/nvkm/subdev/instmem/gk20a.c +++ b/drm/nouveau/nvkm/subdev/instmem/gk20a.c @@ -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); } |