On 11/25/20 5:42 AM, Christian König wrote:
Am 21.11.20 um 06:21 schrieb Andrey Grodzovsky:
It's needed to drop iommu backed pages on device unplug
before device's IOMMU group is released.
It would be cleaner if we could do the whole handling in TTM. I also need to
double check what you are doing with this function.
Christian.
Check patch "drm/amdgpu: Register IOMMU topology notifier per device." to see
how i use it. I don't see why this should go into TTM mid-layer - the stuff I do
inside
is vendor specific and also I don't think TTM is explicitly aware of IOMMU ?
Do you mean you prefer the IOMMU notifier to be registered from within TTM
and then use a hook to call into vendor specific handler ?
Andrey
Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@xxxxxxx>
---
drivers/gpu/drm/ttm/ttm_tt.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
index 1ccf1ef..29248a5 100644
--- a/drivers/gpu/drm/ttm/ttm_tt.c
+++ b/drivers/gpu/drm/ttm/ttm_tt.c
@@ -495,3 +495,4 @@ void ttm_tt_unpopulate(struct ttm_tt *ttm)
else
ttm_pool_unpopulate(ttm);
}
+EXPORT_SYMBOL(ttm_tt_unpopulate);
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