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/*
* SPDX-License-Identifier: MIT
*
* Copyright © 2018 Intel Corporation
*/
#include "i915_drv.h"
#include "intel_gt_requests.h"
#include "i915_selftest.h"
struct pulse {
struct i915_active active;
struct kref kref;
};
static int pulse_active(struct i915_active *active)
{
kref_get(&container_of(active, struct pulse, active)->kref);
return 0;
}
static void pulse_free(struct kref *kref)
{
kfree(container_of(kref, struct pulse, kref));
}
static void pulse_put(struct pulse *p)
{
kref_put(&p->kref, pulse_free);
}
static void pulse_retire(struct i915_active *active)
{
pulse_put(container_of(active, struct pulse, active));
}
static struct pulse *pulse_create(void)
{
struct pulse *p;
p = kmalloc(sizeof(*p), GFP_KERNEL);
if (!p)
return p;
kref_init(&p->kref);
i915_active_init(&p->active, pulse_active, pulse_retire);
return p;
}
static void pulse_unlock_wait(struct pulse *p)
{
mutex_lock(&p->active.mutex);
mutex_unlock(&p->active.mutex);
}
static int __live_idle_pulse(struct intel_engine_cs *engine,
int (*fn)(struct intel_engine_cs *cs))
{
struct pulse *p;
int err;
GEM_BUG_ON(!intel_engine_pm_is_awake(engine));
p = pulse_create();
if (!p)
return -ENOMEM;
err = i915_active_acquire(&p->active);
if (err)
goto out;
err = i915_active_acquire_preallocate_barrier(&p->active, engine);
if (err) {
i915_active_release(&p->active);
goto out;
}
i915_active_acquire_barrier(&p->active);
i915_active_release(&p->active);
GEM_BUG_ON(i915_active_is_idle(&p->active));
GEM_BUG_ON(llist_empty(&engine->barrier_tasks));
err = fn(engine);
if (err)
goto out;
GEM_BUG_ON(!llist_empty(&engine->barrier_tasks));
if (intel_gt_retire_requests_timeout(engine->gt, HZ / 5)) {
err = -ETIME;
goto out;
}
pulse_unlock_wait(p); /* synchronize with the retirement callback */
if (!i915_active_is_idle(&p->active)) {
pr_err("%s: heartbeat pulse did not flush idle tasks\n",
engine->name);
err = -EINVAL;
goto out;
}
out:
pulse_put(p);
return err;
}
static int live_idle_flush(void *arg)
{
struct intel_gt *gt = arg;
struct intel_engine_cs *engine;
enum intel_engine_id id;
int err = 0;
/* Check that we can flush the idle barriers */
for_each_engine(engine, gt, id) {
intel_engine_pm_get(engine);
err = __live_idle_pulse(engine, intel_engine_flush_barriers);
intel_engine_pm_put(engine);
if (err)
break;
}
return err;
}
static int live_idle_pulse(void *arg)
{
struct intel_gt *gt = arg;
struct intel_engine_cs *engine;
enum intel_engine_id id;
int err = 0;
/* Check that heartbeat pulses flush the idle barriers */
for_each_engine(engine, gt, id) {
intel_engine_pm_get(engine);
err = __live_idle_pulse(engine, intel_engine_pulse);
intel_engine_pm_put(engine);
if (err && err != -ENODEV)
break;
err = 0;
}
return err;
}
int intel_heartbeat_live_selftests(struct drm_i915_private *i915)
{
static const struct i915_subtest tests[] = {
SUBTEST(live_idle_flush),
SUBTEST(live_idle_pulse),
};
int saved_hangcheck;
int err;
if (intel_gt_is_wedged(&i915->gt))
return 0;
saved_hangcheck = i915_modparams.enable_hangcheck;
i915_modparams.enable_hangcheck = INT_MAX;
err = intel_gt_live_subtests(tests, &i915->gt);
i915_modparams.enable_hangcheck = saved_hangcheck;
return err;
}
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