drm/nouveau/pm/nv50: add compute and graphics signals/sources
These signals and sources have been reverse engineered from NVIDIA PerfKit (Windows) and CUPTI (Linux), they will be used to build complex hardware events from the userspace. This commit also adds a new class for GT200. Signed-off-by: NSamuel Pitoiset <samuel.pitoiset@gmail.com> Signed-off-by: NBen Skeggs <bskeggs@redhat.com>
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