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While the Sandybridge PRM doesn't have any documentation on the GPU's performance counters, a lot of information can be gleaned from the older Ironlake PRM. Oddly, none of the information documented there actually appears to apply to Ironlake. However, it apparently works just great on Sandybridge. Since this information has all been publicly available on the internet for around three years, we can use it. Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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