drm/i915: allow cache sharing policy control
Expose the SNB+ cache sharing policy register in debugfs. The new file, i915_cache_sharing, has 4 values, 0-3, with 0 being "max uncore resources" and 3 being the minimum. Exposing this control should make benchmarking easier and help us choose a good default. Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: NKeith Packard <keithp@keithp.com>
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