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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 <bskeggs@redhat.com>
Cc: stable@vger.kernel.org
lynxis/untested/v4.19.128
Ben Skeggs 4 years ago
parent
commit
77913bbcb4
  1. 2
      drivers/gpu/drm/nouveau/nvkm/subdev/mmu/base.c

2
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);
}
}

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