[PATCH v5 3/4] drm: allocate GPFIFOs and fences coherently

[Alexandre Courbot]

Specify TTM_PL_FLAG_UNCACHED when allocating GPFIFOs and fences to
allow them to be safely accessed by the kernel without being synced
on non-coherent architectures.

Signed-off-by: Alexandre Courbot <acourbot@xxxxxxxxxx>
---
 drm/nouveau_chan.c | 2 +-
 drm/nv84_fence.c   | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drm/nouveau_chan.c b/drm/nouveau_chan.c
index 77c81d6b45ee..0f3da86840f2 100644
--- a/drm/nouveau_chan.c
+++ b/drm/nouveau_chan.c
@@ -102,7 +102,7 @@ nouveau_channel_prep(struct nouveau_drm *drm, struct nvif_device *device,
 	chan->drm = drm;
 
 	/* allocate memory for dma push buffer */
-	target = TTM_PL_FLAG_TT;
+	target = TTM_PL_FLAG_TT | TTM_PL_FLAG_UNCACHED;
 	if (nouveau_vram_pushbuf)
 		target = TTM_PL_FLAG_VRAM;
 
diff --git a/drm/nv84_fence.c b/drm/nv84_fence.c
index d6c6c87c3f07..4d79be7558d8 100644
--- a/drm/nv84_fence.c
+++ b/drm/nv84_fence.c
@@ -246,8 +246,8 @@ nv84_fence_create(struct nouveau_drm *drm)
 
 	if (ret == 0)
 		ret = nouveau_bo_new(drm->dev, 16 * priv->base.contexts, 0,
-				     TTM_PL_FLAG_TT, 0, 0, NULL, NULL,
-				     &priv->bo_gart);
+				     TTM_PL_FLAG_TT | TTM_PL_FLAG_UNCACHED, 0,
+				     0, NULL, NULL, &priv->bo_gart);
 	if (ret == 0) {
 		ret = nouveau_bo_pin(priv->bo_gart, TTM_PL_FLAG_TT);
 		if (ret == 0) {
-- 
2.1.2

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