Commit 710c0b07 authored Sep 25, 2017 by Ben Skeggs Committed by Greg Kroah-Hartman Oct 27, 2017

drm/nouveau/mmu: flush tlbs before deleting page tables



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 <bskeggs@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent f4f0b6aa

drivers/gpu/drm/nouveau/nvkm/subdev/mmu/base.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -240,6 +240,8 @@ nvkm_vm_unmap_pgt(struct nvkm_vm *vm, int big, u32 fpde, u32 lpde)
		mmu->func->map_pgt(vpgd->obj, pde, vpgt->mem);
		}

		mmu->func->flush(vm);

		nvkm_memory_del(&pgt);
		}
		}