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/*
* SPDX-License-Identifier: MIT
*
* Copyright © 2019 Intel Corporation
*/
#include <linux/sort.h>
#include "intel_gt_clock_utils.h"
#include "selftest_llc.h"
#include "selftest_rc6.h"
#include "selftest_rps.h"
static int cmp_u64(const void *A, const void *B)
{
const u64 *a = A, *b = B;
if (a < b)
return -1;
else if (a > b)
return 1;
else
return 0;
}
static int cmp_u32(const void *A, const void *B)
{
const u32 *a = A, *b = B;
if (a < b)
return -1;
else if (a > b)
return 1;
else
return 0;
}
static void measure_clocks(struct intel_engine_cs *engine,
u32 *out_cycles, ktime_t *out_dt)
{
ktime_t dt[5];
u32 cycles[5];
int i;
for (i = 0; i < 5; i++) {
preempt_disable();
cycles[i] = -ENGINE_READ_FW(engine, RING_TIMESTAMP);
dt[i] = ktime_get();
udelay(1000);
dt[i] = ktime_sub(ktime_get(), dt[i]);
cycles[i] += ENGINE_READ_FW(engine, RING_TIMESTAMP);
preempt_enable();
}
/* Use the median of both cycle/dt; close enough */
sort(cycles, 5, sizeof(*cycles), cmp_u32, NULL);
*out_cycles = (cycles[1] + 2 * cycles[2] + cycles[3]) / 4;
sort(dt, 5, sizeof(*dt), cmp_u64, NULL);
*out_dt = div_u64(dt[1] + 2 * dt[2] + dt[3], 4);
}
static int live_gt_clocks(void *arg)
{
struct intel_gt *gt = arg;
struct intel_engine_cs *engine;
enum intel_engine_id id;
int err = 0;
if (!RUNTIME_INFO(gt->i915)->cs_timestamp_frequency_hz) { /* unknown */
pr_info("CS_TIMESTAMP frequency unknown\n");
return 0;
}
if (INTEL_GEN(gt->i915) < 4) /* Any CS_TIMESTAMP? */
return 0;
if (IS_GEN(gt->i915, 5))
/*
* XXX CS_TIMESTAMP low dword is dysfunctional?
*
* Ville's experiments indicate the high dword still works,
* but at a correspondingly reduced frequency.
*/
return 0;
if (IS_GEN(gt->i915, 4))
/*
* XXX CS_TIMESTAMP appears gibberish
*
* Ville's experiments indicate that it mostly appears 'stuck'
* in that we see the register report the same cycle count
* for a couple of reads.
*/
return 0;
intel_gt_pm_get(gt);
intel_uncore_forcewake_get(gt->uncore, FORCEWAKE_ALL);
for_each_engine(engine, gt, id) {
u32 cycles;
u32 expected;
u64 time;
u64 dt;
if (INTEL_GEN(engine->i915) < 7 && engine->id != RCS0)
continue;
measure_clocks(engine, &cycles, &dt);
time = i915_cs_timestamp_ticks_to_ns(engine->i915, cycles);
expected = i915_cs_timestamp_ns_to_ticks(engine->i915, dt);
pr_info("%s: TIMESTAMP %d cycles [%lldns] in %lldns [%d cycles], using CS clock frequency of %uKHz\n",
engine->name, cycles, time, dt, expected,
RUNTIME_INFO(engine->i915)->cs_timestamp_frequency_hz / 1000);
if (9 * time < 8 * dt || 8 * time > 9 * dt) {
pr_err("%s: CS ticks did not match walltime!\n",
engine->name);
err = -EINVAL;
break;
}
if (9 * expected < 8 * cycles || 8 * expected > 9 * cycles) {
pr_err("%s: walltime did not match CS ticks!\n",
engine->name);
err = -EINVAL;
break;
}
}
intel_uncore_forcewake_put(gt->uncore, FORCEWAKE_ALL);
intel_gt_pm_put(gt);
return err;
}
static int live_gt_resume(void *arg)
{
struct intel_gt *gt = arg;
IGT_TIMEOUT(end_time);
int err;
/* Do several suspend/resume cycles to check we don't explode! */
do {
intel_gt_suspend_prepare(gt);
intel_gt_suspend_late(gt);
if (gt->rc6.enabled) {
pr_err("rc6 still enabled after suspend!\n");
intel_gt_set_wedged_on_init(gt);
err = -EINVAL;
break;
}
err = intel_gt_resume(gt);
if (err)
break;
if (gt->rc6.supported && !gt->rc6.enabled) {
pr_err("rc6 not enabled upon resume!\n");
intel_gt_set_wedged_on_init(gt);
err = -EINVAL;
break;
}
err = st_llc_verify(>->llc);
if (err) {
pr_err("llc state not restored upon resume!\n");
intel_gt_set_wedged_on_init(gt);
break;
}
} while (!__igt_timeout(end_time, NULL));
return err;
}
int intel_gt_pm_live_selftests(struct drm_i915_private *i915)
{
static const struct i915_subtest tests[] = {
SUBTEST(live_gt_clocks),
SUBTEST(live_rc6_manual),
SUBTEST(live_rps_clock_interval),
SUBTEST(live_rps_control),
SUBTEST(live_rps_frequency_cs),
SUBTEST(live_rps_frequency_srm),
SUBTEST(live_rps_power),
SUBTEST(live_rps_interrupt),
SUBTEST(live_rps_dynamic),
SUBTEST(live_gt_resume),
};
if (intel_gt_is_wedged(&i915->gt))
return 0;
return intel_gt_live_subtests(tests, &i915->gt);
}
int intel_gt_pm_late_selftests(struct drm_i915_private *i915)
{
static const struct i915_subtest tests[] = {
/*
* These tests may leave the system in an undesirable state.
* They are intended to be run last in CI and the system
* rebooted afterwards.
*/
SUBTEST(live_rc6_ctx_wa),
};
if (intel_gt_is_wedged(&i915->gt))
return 0;
return intel_gt_live_subtests(tests, &i915->gt);
}
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