[PATCH v3 5/5] 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.

v2:
- Rebase on dynamic exporter. Update the igt_dmabuf_import_same_driver
  selftest to migrate if we are LMEM capable.

Signed-off-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c           | 7 ++++++-
 drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c | 4 +++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
index 1d1eeb167d28..5207aa3af009 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
@@ -29,7 +29,12 @@ static struct sg_table *i915_gem_map_dma_buf(struct dma_buf_attachment *attachme
 
 	assert_object_held(obj);
 
-	ret = i915_gem_object_pin_pages(obj);
+	if (!i915_gem_object_can_migrate(obj, INTEL_REGION_SMEM))
+		return ERR_PTR(-EOPNOTSUPP);
+
+	ret = i915_gem_object_migrate(obj, NULL, INTEL_REGION_SMEM);
+	if (!ret)
+		ret = i915_gem_object_pin_pages(obj);
 	if (ret)
 		goto err;
 
diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c
index 24735d6c12a2..b6278dba98d0 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c
@@ -94,7 +94,9 @@ static int igt_dmabuf_import_same_driver(void *arg)
 	int err;
 
 	force_different_devices = true;
-	obj = i915_gem_object_create_shmem(i915, PAGE_SIZE);
+	obj = i915_gem_object_create_lmem(i915, PAGE_SIZE, 0);
+	if (IS_ERR(obj))
+		obj = i915_gem_object_create_shmem(i915, PAGE_SIZE);
 	if (IS_ERR(obj))
 		goto out_ret;
 
-- 
2.31.1