From: Andi Shyti <andi.shyti@xxxxxxxxx> Add three basic tests for rc6 power status: 1. live_rc6_basic - simply checks if rc6 works when it's enabled or stops when it's disabled. 2. live_rc6_threshold - rc6 should not work when the evaluation interval is less than the threshold and should work otherwise. 3. live_rc6_busy - keeps the gpu busy and then goes in idle; checks that we don't fall in rc6 when busy and that we do fall in rc6 when idling. The three tests are added as sutest of the bigger live_late_gt_pm selftest. The basic rc6 functionality is tested by checking the reference counter within the evaluation interval. Signed-off-by: Andi Shyti <andi.shyti@xxxxxxxxx> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> --- I sent the wrong patch, sorry, this is the right one. Andi Changelog: * v4 -> v5: - added changes in v4 which I forgot to include - a small renaming and refactoring suggested by Mika to make clear the purpose of the test function. Now it's called "is_rc6_active" in a question format (and I believe Chris won't like my creativity) and it returns true if rc6 is active and false otherwise. Thanks, Mika! - fixed a couple of typos. * v3 -> v4: - just a small refactoring where test_rc6 becomes a measure function while another test_rc6 checks the return value from the measure. * v2 -> v3: - rebased on top of the latest drm-tip - fixed exiting order in rc6_basic to avoid exiting without releasing the pm reference * v1 -> v2: - some changes from Chris (thank you!). drivers/gpu/drm/i915/gt/selftest_gt_pm.c | 2 + drivers/gpu/drm/i915/gt/selftest_rc6.c | 179 +++++++++++++++++++++++ drivers/gpu/drm/i915/gt/selftest_rc6.h | 2 + 3 files changed, 183 insertions(+) diff --git a/drivers/gpu/drm/i915/gt/selftest_gt_pm.c b/drivers/gpu/drm/i915/gt/selftest_gt_pm.c index 09ff8e4f88af..5c7b92301a14 100644 --- a/drivers/gpu/drm/i915/gt/selftest_gt_pm.c +++ b/drivers/gpu/drm/i915/gt/selftest_gt_pm.c @@ -52,6 +52,8 @@ int intel_gt_pm_live_selftests(struct drm_i915_private *i915) { static const struct i915_subtest tests[] = { SUBTEST(live_rc6_manual), + SUBTEST(live_rc6_threshold), + SUBTEST(live_rc6_busy), SUBTEST(live_gt_resume), }; diff --git a/drivers/gpu/drm/i915/gt/selftest_rc6.c b/drivers/gpu/drm/i915/gt/selftest_rc6.c index 5f7e2dcf5686..7b5d476a8ad1 100644 --- a/drivers/gpu/drm/i915/gt/selftest_rc6.c +++ b/drivers/gpu/drm/i915/gt/selftest_rc6.c @@ -11,6 +11,7 @@ #include "selftest_rc6.h" #include "selftests/i915_random.h" +#include "selftests/igt_spinner.h" int live_rc6_manual(void *arg) { @@ -202,3 +203,181 @@ int live_rc6_ctx_wa(void *arg) kfree(engines); return err; } + +static u32 measure_rc6(struct intel_uncore *uncore, u32 interval) +{ + u32 ec1, ec2; + + ec1 = intel_uncore_read(uncore, GEN6_GT_GFX_RC6); + + /* + * It's not important to precisely wait the interval time. + * I'll wait at least twice the time in order to be sure + * that the counting happens in the reference counter. + */ + msleep(interval); + + ec2 = intel_uncore_read(uncore, GEN6_GT_GFX_RC6); + + pr_info("interval:%x [%dms], threshold:%x, rc6:%x\n", + intel_uncore_read(uncore, GEN6_RC_EVALUATION_INTERVAL), + interval, + intel_uncore_read(uncore, GEN6_RC6_THRESHOLD), + ec2 - ec1); + + /* paranoia? ec2 is always supposed to be bigger */ + return (ec2 >= ec1) ? ec2 - ec1 : 0; +} + +static bool is_rc6_active(struct intel_rc6 *rc6) +{ + struct intel_uncore *uncore = rc6_to_uncore(rc6); + intel_wakeref_t wakeref; + u32 interval; + + wakeref = intel_runtime_pm_get(uncore->rpm); + + interval = intel_uncore_read(uncore, GEN6_RC_EVALUATION_INTERVAL); + + /* + * the interval is stored in steps of 1.28us + */ + interval = div_u64(mul_u32_u32(interval, 128), + 100 * 1000); /* => milliseconds */ + + intel_runtime_pm_put(uncore->rpm, wakeref); + + return !!measure_rc6(uncore, 2 * interval); +} + +int live_rc6_threshold(void *arg) +{ + struct intel_gt *gt = arg; + struct intel_uncore *uncore = gt->uncore; + struct intel_rc6 *rc6 = >->rc6; + intel_wakeref_t wakeref; + u32 threshold, interval; + u32 t_orig, i_orig; + int err = 0; + + if (!rc6->manual) /* No interfering PCU! */ + return 0; + + wakeref = intel_runtime_pm_get(uncore->rpm); + + __intel_rc6_disable(rc6); /* stop before adjusting thresholds */ + + t_orig = intel_uncore_read(uncore, GEN6_RC6_THRESHOLD); + i_orig = intel_uncore_read(uncore, GEN6_RC_EVALUATION_INTERVAL); + + /* + * set the threshold to 50ms + * + * 50ms * 1000 = 50000us + * 50000 / (1.28 * 100) / 100 (we don't have floating point) + */ + threshold = 50 * 1000 / 128 * 100; + intel_uncore_write(uncore, GEN6_RC6_THRESHOLD, threshold); + + /* set interval indicatively to half the threshold */ + interval = threshold / 2; + intel_uncore_write(uncore, GEN6_RC_EVALUATION_INTERVAL, interval); + + intel_rc6_unpark(rc6); + + /* interval < threshold */ + if (is_rc6_active(rc6)) { + pr_err("i915 mismatch: rc6 with interval < threshold\n"); + err = -EINVAL; + } + + __intel_rc6_disable(rc6); + + /* set interval indicatively to twice the threshold */ + interval = threshold * 2; + intel_uncore_write(uncore, GEN6_RC_EVALUATION_INTERVAL, interval); + + intel_rc6_unpark(rc6); + + /* interval > threshold */ + if (!is_rc6_active(rc6)) { + pr_err("i915 mismatch: not in rc6 with interval > threshold\n"); + err = -EINVAL; + } + + __intel_rc6_disable(rc6); + + intel_uncore_write(uncore, GEN6_RC6_THRESHOLD, t_orig); + intel_uncore_write(uncore, GEN6_RC_EVALUATION_INTERVAL, i_orig); + + intel_rc6_park(rc6); + + intel_runtime_pm_put(uncore->rpm, wakeref); + + return err; +} + +int live_rc6_busy(void *arg) +{ + struct intel_gt *gt = arg; + struct intel_rc6 *rc6 = >->rc6; + struct intel_engine_cs *engine; + struct igt_spinner spin; + intel_wakeref_t wakeref; + enum intel_engine_id id; + int err; + + if (!rc6->supported) + return 0; + + err = igt_spinner_init(&spin, gt); + if (err) + return err; + + wakeref = intel_runtime_pm_get(gt->uncore->rpm); + for_each_engine(engine, gt, id) { + struct i915_request *rq; + + rq = igt_spinner_create_request(&spin, + engine->kernel_context, + MI_NOOP); + if (IS_ERR(rq)) { + err = PTR_ERR(rq); + break; + } + + i915_request_get(rq); + i915_request_add(rq); + + igt_wait_for_spinner(&spin, rq); /* it's enough waiting */ + + /* gpu is busy, we shouldn't be in rc6 */ + if (is_rc6_active(rc6)) { + pr_err("%s: never busy enough for having a nap\n", + engine->name); + err = -EINVAL; + } + + igt_spinner_end(&spin); + if (i915_request_wait(rq, 0, HZ / 5) < 0) + err = -ETIME; + i915_request_put(rq); + if (err) + break; + + intel_gt_wait_for_idle(gt, HZ / 5); + intel_gt_pm_wait_for_idle(gt); + + /* gpu is idle, we should be in rc6 */ + if (!is_rc6_active(rc6)) { + pr_err("%s is idle but doesn't go in rc6\n", + engine->name); + err = -EINVAL; + break; + } + } + intel_runtime_pm_put(gt->uncore->rpm, wakeref); + + igt_spinner_fini(&spin); + return err; +} diff --git a/drivers/gpu/drm/i915/gt/selftest_rc6.h b/drivers/gpu/drm/i915/gt/selftest_rc6.h index 762fd442d7b2..312894423dc2 100644 --- a/drivers/gpu/drm/i915/gt/selftest_rc6.h +++ b/drivers/gpu/drm/i915/gt/selftest_rc6.h @@ -7,7 +7,9 @@ #ifndef SELFTEST_RC6_H #define SELFTEST_RC6_H +int live_rc6_busy(void *arg); int live_rc6_ctx_wa(void *arg); int live_rc6_manual(void *arg); +int live_rc6_threshold(void *arg); #endif /* SELFTEST_RC6_H */ -- 2.25.0 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx