From 77913bbcb43ac9a07a6fe849c2fd3bf85fc8bdd8 Mon Sep 17 00:00:00 2001 From: Ben Skeggs Date: Mon, 25 Sep 2017 15:05:38 +1000 Subject: [PATCH] drm/nouveau/mmu: flush tlbs before deleting page tables 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 Cc: stable@vger.kernel.org --- drivers/gpu/drm/nouveau/nvkm/subdev/mmu/base.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/base.c index d06ad2c372bf..455da298227f 100644 --- a/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/base.c +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/mmu/base.c @@ -241,6 +241,8 @@ 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); } } -- 2.20.1