Quoting Chris Wilson (2019-02-12 22:39:46)
> As we track when we put the GT device to sleep upon idling, we can use
> that callback to sample the current rc6 counters and record the
> timestamp for estimating samples after that point while asleep.
Bah, the perf_pmu/rc6 test bypasses the GPU and pokes the forcewake bit
instead. This needs
@@ -1495,9 +1496,11 @@ test_rc6(int gem_fd, unsigned int flags)
igt_assert(fw >= 0);
usleep(1e3); /* wait for the rc6 cycle counter to stop ticking */
+ spin = igt_spin_batch_new(gem_fd, .engine = I915_EXEC_RENDER);
prev = pmu_read_single(fd);
usleep(duration_ns / 1000);
busy = pmu_read_single(fd);
+ igt_spin_batch_end(spin);
to paper over the difference.
-Chris
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