On 11/21/20 9:13 AM, Christian König wrote:
Am 21.11.20 um 06:21 schrieb Andrey Grodzovsky:
Fixes oops.
That file doesn't even exist any more. What oops should this fix?
Which file ?
We set dma_address to NULL in every other place after unmap. This is so that
if dma address was already unmapped we skip it next time we enter
ttm_unmap_and_unpopulate_pages
with same tt for some reason.
The oops happens with IOMMU enabled. The device is removed from it's IOMMU group
during PCI remove but the BOs are all still alive if user mode client holds
reference to drm file.
Later when the refernece is droppped and device fini happens i get oops in
ttm_unmap_and_unpopulate_pages->dma_unmap_page becaue of IOMMU group structures
being gone already.
Patch [11/12] drm/amdgpu: Register IOMMU topology notifier per device together
with this patch solve the oops.
Andrey
Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@xxxxxxx>
---
drivers/gpu/drm/ttm/ttm_page_alloc.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c
b/drivers/gpu/drm/ttm/ttm_page_alloc.c
index b40a467..b0df328 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c
@@ -1160,6 +1160,8 @@ void ttm_unmap_and_unpopulate_pages(struct device *dev,
struct ttm_dma_tt *tt)
dma_unmap_page(dev, tt->dma_address[i], num_pages * PAGE_SIZE,
DMA_BIDIRECTIONAL);
+ tt->dma_address[i] = 0;
+
i += num_pages;
}
ttm_pool_unpopulate(&tt->ttm);
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