From 4516069f1b05d3e84f5e11a8490ee0ca09997731 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 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 Signed-off-by: Greg Kroah-Hartman --- 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 e04a2296ecd0..5bb7f7e0f11f 100644 --- 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, 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