[PATCH 4/6] drm/amd/amdgpu: Pin bos from imported dma-bufs to GTT.

[raof at ubuntu.com]

From: Christopher James Halse Rogers <christopher.halse.rogers at canonical.com>

Attempting to migrate the bo will break the sharing of the buffer.

Signed-off-by: Christopher James Halse Rogers <christopher.halse.rogers at canonical.com>
CC: amd-gfx at lists.freedesktop.org
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c
index 3826d5aea0a6..3c84ec5c6ac8 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_prime.c
@@ -74,6 +74,17 @@ amdgpu_gem_prime_import_sg_table(struct drm_device *dev,
 	if (ret)
 		return ERR_PTR(ret);
 
+	/* Imported bo must be pinned to GTT, as moving it breaks sharing */
+	ret = amdgpu_bo_reserve(bo, false);
+	if (ret)
+		return ERR_PTR(ret);
+
+	ret = amdgpu_bo_pin(bo, AMDGPU_GEM_DOMAIN_GTT, NULL);
+	if (ret)
+		return ERR_PTR(ret);
+
+	amdgpu_bo_unreserve(bo);
+
 	bo->prime_shared_count = 1;
 	return &bo->gem_base;
 }
-- 
2.11.0