FAILED: Patch "drm/amdgpu: fix sync handling in amdgpu_dma_buf_move_notify" failed to apply to 6.1-stable tree

The patch below does not apply to the 6.1-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

From b18fc0ab837381c1a6ef28386602cd888f2d9edf Mon Sep 17 00:00:00 2001
From: Pierre-Eric Pelloux-Prayer <[email protected]>
Date: Mon, 9 Feb 2026 18:54:45 +0100
Subject: [PATCH] drm/amdgpu: fix sync handling in amdgpu_dma_buf_move_notify
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Invalidating a dmabuf will impact other users of the shared BO. In the scenario where process A moves the BO, it needs to inform process B about the move and process B will need to update its page table.

The commit fixes a synchronisation bug caused by the use of the
ticket: it made amdgpu_vm_handle_moved behave as if updating the page table immediately was correct but in this case it's not.

An example is the following scenario, with 2 GPUs and glxgears running on GPU0 and Xorg running on GPU1, on a system where P2P PCI isn't supported:

glxgears:
export linear buffer from GPU0 and import using GPU1 submit frame rendering to GPU0
submit tiled->linear blit
Xorg:
copy of linear buffer

The sequence of jobs would be:

  drm_sched_job_run                       # GPU0, frame rendering
  drm_sched_job_queue                     # GPU0, blit
  drm_sched_job_done                      # GPU0, frame rendering
  drm_sched_job_run                       # GPU0, blit
  move linear buffer for GPU1 access      #

amdgpu_dma_buf_move_notify -> update pt # GPU0

It this point the blit job on GPU0 is still running and would likely produce a page fault.

---
 drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

index b9c38a4fe546a..656c267dbe587 100644
@@ -514,8 +514,15 @@ amdgpu_dma_buf_move_notify(struct dma_buf_attachment *attach)
 		r = dma_resv_reserve_fences(resv, 2);
 		if (!r)
 			r = amdgpu_vm_clear_freed(adev, vm, NULL);
+
+		/* Don't pass 'ticket' to amdgpu_vm_handle_moved: we want the clear=true
+		 * path to be used otherwise we might update the PT of another process
+		 * while it's using the BO.
+		 * With clear=true, amdgpu_vm_bo_update will sync to command submission
+		 * from the same VM.
+		 */
 		if (!r)
-			r = amdgpu_vm_handle_moved(adev, vm, ticket);
+			r = amdgpu_vm_handle_moved(adev, vm, NULL);
 
 		if (r && r != -EBUSY)
 			DRM_ERROR("Failed to invalidate VM page tables (%d))\n",

2.51.0