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drm/i915/selftests: Disable preemption while setting up fence-timers 

The impossible happens and a future fence expired while we were still
initialising. The probable cause is that the test was preempted and we
lost our scheduler cpu slice. Disable preemption during this test to
rule out preemption as a source of timer disruption.

References: https://bugs.freedesktop.org/show_bug.cgi?id=110039
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190313205944.5768-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-03-13 20:59:44 +00:00
parent 628ac441e8
commit d2eeaf2bc0
1 changed files with 8 additions and 1 deletions
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9
drivers/gpu/drm/i915/selftests/i915_sw_fence.c
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@ -571,21 +571,27 @@ static int test_timer(void *arg)
unsigned long target, delay;
struct timed_fence tf;
preempt_disable();
timed_fence_init(&tf, target = jiffies);
if (!i915_sw_fence_done(&tf.fence)) {
pr_err("Fence with immediate expiration not signaled\n");
goto err;
}
preempt_enable();
timed_fence_fini(&tf);
for_each_prime_number(delay, i915_selftest.timeout_jiffies/2) {
preempt_disable();
timed_fence_init(&tf, target = jiffies + delay);
if (i915_sw_fence_done(&tf.fence)) {
pr_err("Fence with future expiration (%lu jiffies) already signaled\n", delay);
goto err;
}
preempt_enable();
i915_sw_fence_wait(&tf.fence);
preempt_disable();
if (!i915_sw_fence_done(&tf.fence)) {
pr_err("Fence not signaled after wait\n");
goto err;
@ -595,13 +601,14 @@ static int test_timer(void *arg)
target, jiffies);
goto err;
}
preempt_enable();
timed_fence_fini(&tf);
}
return 0;
err:
preempt_enable();
timed_fence_fini(&tf);
return -EINVAL;
}