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/*
* SPDX-License-Identifier: GPL-2.0
*
* Copyright © 2018 Intel Corporation
*/
#include "i915_selftest.h"
#include "selftest_engine.h"
#include "selftests/igt_atomic.h"
static int live_engine_pm(void *arg)
{
struct intel_gt *gt = arg;
struct intel_engine_cs *engine;
enum intel_engine_id id;
/*
* Check we can call intel_engine_pm_put from any context. No
* failures are reported directly, but if we mess up lockdep should
* tell us.
*/
if (intel_gt_pm_wait_for_idle(gt)) {
pr_err("Unable to flush GT pm before test\n");
return -EBUSY;
}
GEM_BUG_ON(intel_gt_pm_is_awake(gt));
for_each_engine(engine, gt->i915, id) {
const typeof(*igt_atomic_phases) *p;
for (p = igt_atomic_phases; p->name; p++) {
/*
* Acquisition is always synchronous, except if we
* know that the engine is already awake, in which
* case we should use intel_engine_pm_get_if_awake()
* to atomically grab the wakeref.
*
* In practice,
* intel_engine_pm_get();
* intel_engine_pm_put();
* occurs in one thread, while simultaneously
* intel_engine_pm_get_if_awake();
* intel_engine_pm_put();
* occurs from atomic context in another.
*/
GEM_BUG_ON(intel_engine_pm_is_awake(engine));
intel_engine_pm_get(engine);
p->critical_section_begin();
if (!intel_engine_pm_get_if_awake(engine))
pr_err("intel_engine_pm_get_if_awake(%s) failed under %s\n",
engine->name, p->name);
else
intel_engine_pm_put(engine);
intel_engine_pm_put(engine);
p->critical_section_end();
/* engine wakeref is sync (instant) */
if (intel_engine_pm_is_awake(engine)) {
pr_err("%s is still awake after flushing pm\n",
engine->name);
return -EINVAL;
}
/* gt wakeref is async (deferred to workqueue) */
if (intel_gt_pm_wait_for_idle(gt)) {
pr_err("GT failed to idle\n");
return -EINVAL;
}
}
}
return 0;
}
int live_engine_pm_selftests(struct intel_gt *gt)
{
static const struct i915_subtest tests[] = {
SUBTEST(live_engine_pm),
};
return intel_gt_live_subtests(tests, gt);
}
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