Growing the batch/state buffer is a lot more dangerous than I thought.
A number of places emit multiple state buffer sections, and then write
data to the returned pointer, or save a pointer to brw->batch.state.bo
and then use it in relocations. If each call can grow, this can result
in stale map
Quoting Kenneth Graunke (2018-01-05 18:56:32)
> Growing the batch/state buffer is a lot more dangerous than I thought.
>
> A number of places emit multiple state buffer sections, and then write
> data to the returned pointer, or save a pointer to brw->batch.state.bo
> and then use it in relocation
