drm/i915/perf: introduce a versioning of the i915-perf uapi
Reporting this version will help application figure out what level of the support the running kernel provides. v2: Add i915_perf_ioctl_version() (Chris) Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20191014201404.22468-1-chris@chris-wilson.co.uk
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