tests/perf_pmu: Simplify interrupt testing

Rather than calibrate and emit nop batches, use a manually signalled chain
of spinners to generate the desired interrupts.

v2: Two flavours of interrupt generation. (Chris Wilson)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
1 file changed