Check that if we submit a request that is held up by an external fence,
that we conserve power during the wait as the GPU is idle.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Venkata Sandeep Dhanalakota <venkata.s.dhanalakota@xxxxxxxxx>
---
tests/i915/i915_pm_rc6_residency.c | 82 ++++++++++++++++++++++++++++++
1 file changed, 82 insertions(+)
diff --git a/tests/i915/i915_pm_rc6_residency.c b/tests/i915/i915_pm_rc6_residency.c
index 144bcd028..810415b48 100644
--- a/tests/i915/i915_pm_rc6_residency.c
+++ b/tests/i915/i915_pm_rc6_residency.c
@@ -38,6 +38,7 @@
#include "igt_perf.h"
#include "igt_rapl.h"
#include "igt_sysfs.h"
+#include "sw_sync.h"
#define SLEEP_DURATION 3 /* in seconds */
@@ -447,6 +448,80 @@ static void rc6_idle(int i915)
}
}
+static void rc6_fence(int i915)
+{
+ const int64_t duration_ns = SLEEP_DURATION * (int64_t)NSEC_PER_SEC;
+ const int tolerance = 20; /* Some RC6 is better than none! */
+ const int gen = intel_gen(intel_get_drm_devid(i915));
+ const struct intel_execution_engine2 *e;
+ struct power_sample sample[2];
+ unsigned long slept;
+ uint64_t rc6, ts[2];
+ struct rapl rapl;
+ int fd;
+
+ igt_require_sw_sync();
+
+ fd = open_pmu(i915, I915_PMU_RC6_RESIDENCY);
+ igt_drop_caches_set(i915, DROP_IDLE);
+ igt_require(__pmu_wait_for_rc6(fd));
+ gpu_power_open(&rapl);
+
+ /* While idle check full RC6. */
+ rapl_read(&rapl, &sample[0]);
+ rc6 = -__pmu_read_single(fd, &ts[0]);
+ slept = measured_usleep(duration_ns / 1000);
+ rc6 += __pmu_read_single(fd, &ts[1]);
+ igt_debug("slept=%lu perf=%"PRIu64", rc6=%"PRIu64"\n",
+ slept, ts[1] - ts[0], rc6);
+ if (rapl_read(&rapl, &sample[1])) {
+ double idle = power_J(&rapl, &sample[0], &sample[1]);
+ igt_log(IGT_LOG_DOMAIN,
+ idle > 1e-3 && gen > 6 ? IGT_LOG_WARN : IGT_LOG_INFO,
+ "Total energy used while idle: %.1fmJ\n", idle * 1e3);
+ }
+ assert_within_epsilon(rc6, ts[1] - ts[0], 5);
+
+ /* Submit but delay execution, we should be idle and conserving power */
+ __for_each_physical_engine(i915, e) {
+ igt_spin_t *spin;
+ int timeline;
+ int fence;
+
+ timeline = sw_sync_timeline_create();
+ fence = sw_sync_timeline_create_fence(timeline, 1);
+ spin = igt_spin_new(i915,
+ .engine = e->flags,
+ .fence = fence,
+ .flags = IGT_SPIN_FENCE_IN);
+ close(fence);
+
+ rapl_read(&rapl, &sample[0]);
+ rc6 = -__pmu_read_single(fd, &ts[0]);
+ slept = measured_usleep(duration_ns / 1000);
+ rc6 += __pmu_read_single(fd, &ts[1]);
+ igt_debug("%s: slept=%lu perf=%"PRIu64", rc6=%"PRIu64"\n",
+ e->name, slept, ts[1] - ts[0], rc6);
+ if (rapl_read(&rapl, &sample[1])) {
+ uint64_t power = power_J(&rapl, &sample[0], &sample[1]);
+ igt_info("Total energy used for %s: %.1fmJ (%.1fmW)\n",
+ e->name,
+ power * 1e3,
+ power * 1e12 / slept);
+ }
+
+ igt_assert(gem_bo_busy(i915, spin->handle));
+ igt_spin_free(i915, spin);
+
+ close(timeline);
+
+ assert_within_epsilon(rc6, ts[1] - ts[0], tolerance);
+ }
+
+ rapl_close(&rapl);
+ close(fd);
+}
+
igt_main
{
int i915 = -1;
@@ -463,6 +538,13 @@ igt_main
rc6_idle(i915);
}
+ igt_subtest("rc6-fence") {
+ igt_require_gem(i915);
+ gem_quiescent_gpu(i915);
+
+ rc6_fence(i915);
+ }
+
igt_subtest_group {
unsigned int rc6_enabled = 0;
unsigned int devid = 0;
--
2.27.0.rc0
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