[PATCH 3/4] nouveau: populate buffers before exporting them.

[Dave Airlie <airlied@gmail.com>]

From: Dave Airlie <airlied@redhat.com>

Before exporting a buffer, make sure it has been populated with
pages at least once.

Signed-off-by: Dave Airlie <airlied@redhat.com>
---
 drivers/gpu/drm/nouveau/nouveau_prime.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/nouveau/nouveau_prime.c b/drivers/gpu/drm/nouveau/nouveau_prime.c
index cd95446d6851..caab60fc62f6 100644
--- a/drivers/gpu/drm/nouveau/nouveau_prime.c
+++ b/drivers/gpu/drm/nouveau/nouveau_prime.c
@@ -108,9 +108,21 @@ struct dma_buf *nouveau_gem_prime_export(struct drm_gem_object *gobj,
 					 int flags)
 {
 	struct nouveau_bo *nvbo = nouveau_gem_object(gobj);
+	struct ttm_operation_ctx ctx = {
+		.interruptible = true,
+		.no_wait_gpu = true,
+		/* We opt to avoid OOM on system pages allocations */
+		.gfp_retry_mayfail = true,
+		.allow_res_evict = false,
+	};
+	int ret;
 
 	if (nvbo->no_share)
 		return ERR_PTR(-EPERM);
 
+	ret = ttm_bo_setup_export(&nvbo->bo, &ctx);
+	if (ret)
+		return ERR_PTR(ret);
+
 	return drm_gem_prime_export(gobj, flags);
 }
-- 
2.50.1