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1// SPDX-License-Identifier: MIT2/*3 * Copyright © 2019 Intel Corporation4 */5 6#include <linux/sort.h>7 8#include "intel_engine_regs.h"9#include "intel_gt_clock_utils.h"10 11#include "selftest_llc.h"12#include "selftest_rc6.h"13#include "selftest_rps.h"14 15static int cmp_u64(const void *A, const void *B)16{17	const u64 *a = A, *b = B;18 19	if (a < b)20		return -1;21	else if (a > b)22		return 1;23	else24		return 0;25}26 27static int cmp_u32(const void *A, const void *B)28{29	const u32 *a = A, *b = B;30 31	if (a < b)32		return -1;33	else if (a > b)34		return 1;35	else36		return 0;37}38 39static u32 read_timestamp(struct intel_engine_cs *engine)40{41	struct drm_i915_private *i915 = engine->i915;42 43	/* On i965 the first read tends to give a stale value */44	ENGINE_READ_FW(engine, RING_TIMESTAMP);45 46	if (GRAPHICS_VER(i915) == 5 || IS_G4X(i915))47		return ENGINE_READ_FW(engine, RING_TIMESTAMP_UDW);48	else49		return ENGINE_READ_FW(engine, RING_TIMESTAMP);50}51 52static void measure_clocks(struct intel_engine_cs *engine,53			   u32 *out_cycles, ktime_t *out_dt)54{55	ktime_t dt[5];56	u32 cycles[5];57	int i;58 59	for (i = 0; i < 5; i++) {60		local_irq_disable();61		cycles[i] = -read_timestamp(engine);62		dt[i] = ktime_get();63 64		udelay(1000);65 66		cycles[i] += read_timestamp(engine);67		dt[i] = ktime_sub(ktime_get(), dt[i]);68		local_irq_enable();69	}70 71	/* Use the median of both cycle/dt; close enough */72	sort(cycles, 5, sizeof(*cycles), cmp_u32, NULL);73	*out_cycles = (cycles[1] + 2 * cycles[2] + cycles[3]) / 4;74 75	sort(dt, 5, sizeof(*dt), cmp_u64, NULL);76	*out_dt = div_u64(dt[1] + 2 * dt[2] + dt[3], 4);77}78 79static int live_gt_clocks(void *arg)80{81	struct intel_gt *gt = arg;82	struct intel_engine_cs *engine;83	enum intel_engine_id id;84	intel_wakeref_t wakeref;85	int err = 0;86 87	if (!gt->clock_frequency) { /* unknown */88		pr_info("CS_TIMESTAMP frequency unknown\n");89		return 0;90	}91 92	if (GRAPHICS_VER(gt->i915) < 4) /* Any CS_TIMESTAMP? */93		return 0;94 95	wakeref = intel_gt_pm_get(gt);96	intel_uncore_forcewake_get(gt->uncore, FORCEWAKE_ALL);97 98	for_each_engine(engine, gt, id) {99		u32 cycles;100		u32 expected;101		u64 time;102		u64 dt;103 104		if (GRAPHICS_VER(engine->i915) < 7 && engine->id != RCS0)105			continue;106 107		measure_clocks(engine, &cycles, &dt);108 109		time = intel_gt_clock_interval_to_ns(engine->gt, cycles);110		expected = intel_gt_ns_to_clock_interval(engine->gt, dt);111 112		pr_info("%s: TIMESTAMP %d cycles [%lldns] in %lldns [%d cycles], using CS clock frequency of %uKHz\n",113			engine->name, cycles, time, dt, expected,114			engine->gt->clock_frequency / 1000);115 116		if (9 * time < 8 * dt || 8 * time > 9 * dt) {117			pr_err("%s: CS ticks did not match walltime!\n",118			       engine->name);119			err = -EINVAL;120			break;121		}122 123		if (9 * expected < 8 * cycles || 8 * expected > 9 * cycles) {124			pr_err("%s: walltime did not match CS ticks!\n",125			       engine->name);126			err = -EINVAL;127			break;128		}129	}130 131	intel_uncore_forcewake_put(gt->uncore, FORCEWAKE_ALL);132	intel_gt_pm_put(gt, wakeref);133 134	return err;135}136 137static int live_gt_resume(void *arg)138{139	struct intel_gt *gt = arg;140	IGT_TIMEOUT(end_time);141	int err;142 143	/* Do several suspend/resume cycles to check we don't explode! */144	do {145		intel_gt_suspend_prepare(gt);146		intel_gt_suspend_late(gt);147 148		if (gt->rc6.enabled) {149			pr_err("rc6 still enabled after suspend!\n");150			intel_gt_set_wedged_on_init(gt);151			err = -EINVAL;152			break;153		}154 155		err = intel_gt_resume(gt);156		if (err)157			break;158 159		if (gt->rc6.supported && !gt->rc6.enabled) {160			pr_err("rc6 not enabled upon resume!\n");161			intel_gt_set_wedged_on_init(gt);162			err = -EINVAL;163			break;164		}165 166		err = st_llc_verify(&gt->llc);167		if (err) {168			pr_err("llc state not restored upon resume!\n");169			intel_gt_set_wedged_on_init(gt);170			break;171		}172	} while (!__igt_timeout(end_time, NULL));173 174	return err;175}176 177int intel_gt_pm_live_selftests(struct drm_i915_private *i915)178{179	static const struct i915_subtest tests[] = {180		SUBTEST(live_gt_clocks),181		SUBTEST(live_rc6_manual),182		SUBTEST(live_rps_clock_interval),183		SUBTEST(live_rps_control),184		SUBTEST(live_rps_frequency_cs),185		SUBTEST(live_rps_frequency_srm),186		SUBTEST(live_rps_power),187		SUBTEST(live_rps_interrupt),188		SUBTEST(live_rps_dynamic),189		SUBTEST(live_gt_resume),190	};191 192	if (intel_gt_is_wedged(to_gt(i915)))193		return 0;194 195	return intel_gt_live_subtests(tests, to_gt(i915));196}197 198int intel_gt_pm_late_selftests(struct drm_i915_private *i915)199{200	static const struct i915_subtest tests[] = {201		/*202		 * These tests may leave the system in an undesirable state.203		 * They are intended to be run last in CI and the system204		 * rebooted afterwards.205		 */206		SUBTEST(live_rc6_ctx_wa),207	};208 209	if (intel_gt_is_wedged(to_gt(i915)))210		return 0;211 212	return intel_gt_live_subtests(tests, to_gt(i915));213}214