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drm/i915: Order assert forcewake test 

Read the current value before computing the expected to ensure that if
the timer does complete early (against our will), it should not cause a
false positive.

v2: The local irq disable did not prevent the timer from running.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111074
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190705074604.16496-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-07-05 08:45:57 +01:00
parent eef037ea02
commit badf1f2724
1 changed files with 3 additions and 4 deletions
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7
drivers/gpu/drm/i915/intel_uncore.c
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@ -758,19 +758,18 @@ void assert_forcewakes_active(struct intel_uncore *uncore,
* Check that the caller has an explicit wakeref and we don't mistake
* it for the auto wakeref.
*/
local_irq_disable();
for_each_fw_domain_masked(domain, fw_domains, uncore, tmp) {
unsigned int actual = READ_ONCE(domain->wake_count);
unsigned int expect = 1;
if (hrtimer_active(&domain->timer) && READ_ONCE(domain->active))
expect++; /* pending automatic release */
if (WARN(domain->wake_count < expect,
if (WARN(actual < expect,
"Expected domain %d to be held awake by caller, count=%d\n",
domain->id, domain->wake_count))
domain->id, actual))
break;
}
local_irq_enable();
}
/* We give fast paths for the really cool registers */