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drm/nouveau/ttm: wait for bo fence to signal before unmapping vmas
TTM was changed a while back to allow for pipelining of buffer moves, and part of this was the removal of waiting for a BO to idle before calling move(), placing the responsibility on the driver to do this if required. That's all well and good, except, we make use of move_notify() to handle mapping/unmapping from the GPU VMM as move() isn't called on all paths. This commit adds a wait before unmapping from a VMM in move_notify(), to prevent GPU page faults where a buffer is still being accessed. Signed-off-by: Ben Skeggs <bskeggs@redhat.com> Cc: stable@vger.kernel.org [v4.8+]
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@ -1209,6 +1209,7 @@ nouveau_bo_move_ntfy(struct ttm_buffer_object *bo, struct ttm_mem_reg *new_mem)
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nvbo->page_shift != vma->vm->mmu->lpg_shift)) {
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nvkm_vm_map(vma, new_mem->mm_node);
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} else {
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WARN_ON(ttm_bo_wait(bo, false, false));
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nvkm_vm_unmap(vma);
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}
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}
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