[PATCH 4/4] drm/i915/gem: Migrate to system at dma-buf map time

[Thomas Hellström]

Until we support p2p dma or as a complement to that, migrate data
to system memory at dma-buf map time if possible.

Signed-off-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
index 616c3a2f1baf..a52f885bc09a 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
@@ -25,7 +25,14 @@ static struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachme
 	struct scatterlist *src, *dst;
 	int ret, i;
 
-	ret = i915_gem_object_pin_pages_unlocked(obj);
+	ret = i915_gem_object_lock_interruptible(obj, NULL);
+	if (ret)
+		return ERR_PTR(ret);
+
+	ret = i915_gem_object_migrate(obj, NULL, INTEL_REGION_SMEM);
+	if (!ret)
+		ret = i915_gem_object_pin_pages(obj);
+	i915_gem_object_unlock(obj);
 	if (ret)
 		goto err;
 
-- 
2.31.1