On Fri, 24 Jan 2020 at 11:51, Chris Wilson <[email protected]> wrote:
>
> Using a clear page for scratch means that we have relatively benign
> errors in case it is accidentally used, but that can be rather too
> benign for debugging. If we poison the scratch, ideally it quickly
> results in an obvious error.
>
> v2: Set each page individually just in case we are using highmem for our
> scratch page.
> v3: Pick a new scratch register as MI_STORE_REGISTER_MEM does not work
> with GPR0 on gen7, unbelievably.
> v4: Haswell still considers 3DPRIM a privileged register!
>
> Suggested-by: Mika Kuoppala <[email protected]>
> Signed-off-by: Chris Wilson <[email protected]>
> Cc: Mika Kuoppala <[email protected]>
> Cc: Matthew Auld <[email protected]>
Reviewed-by: Matthew Auld <[email protected]>
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