4.9-stable review patch. If anyone has any objections, please let me know.
------------------ From: Ben Skeggs <[email protected]> commit 77913bbcb43ac9a07a6fe849c2fd3bf85fc8bdd8 upstream. Even though we've zeroed the PDE, the GPU may have cached the PD, so we need to flush when deleting them. Noticed while working on replacement MMU code, but a backport might be a good idea, so let's fix it in the current code too. Signed-off-by: Ben Skeggs <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/gpu/drm/nouveau/nvkm/subdev/mmu/base.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/base.c +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/base.c @@ -240,6 +240,8 @@ nvkm_vm_unmap_pgt(struct nvkm_vm *vm, in mmu->func->map_pgt(vpgd->obj, pde, vpgt->mem); } + mmu->func->flush(vm); + nvkm_memory_del(&pgt); } }
