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drm/i915/selftests: Assert that the idle_pulse is sent 

When checking the heartbeat pulse, we expect it to have been sent by the
time we have slept. We can verify this by checking the engine serial
number to see if that matches the predicted pulse serial. It will always
be true if, and only if, the pulse was sent by itself (as designed by
the test).

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191031094259.23028-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-10-31 09:42:59 +00:00
parent 29b27657db
commit 1db257c55f
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/i915/gt/selftest_engine_heartbeat.c
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@ -97,6 +97,8 @@ static int __live_idle_pulse(struct intel_engine_cs *engine,
goto out;
}
GEM_BUG_ON(READ_ONCE(engine->serial) != engine->wakeref_serial);
pulse_unlock_wait(p); /* synchronize with the retirement callback */
if (!i915_active_is_idle(&p->active)) {
@ -337,7 +339,7 @@ int intel_heartbeat_live_selftests(struct drm_i915_private *i915)
saved_hangcheck = i915_modparams.enable_hangcheck;
i915_modparams.enable_hangcheck = INT_MAX;
err = intel_gt_live_subtests(tests, &i915->gt);
err = intel_gt_live_subtests(tests, &i915->gt);
i915_modparams.enable_hangcheck = saved_hangcheck;
return err;