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drm/i915/selftests: Force a failed engine reset

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Inject a fault into the engine reset and check that the outstanding
requests are completed despite the failed reset.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210113205049.22565-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2021-01-13 20:50:49 +00:00
parent 007c457876
commit 106a9368dc
1 changed files with 144 additions and 0 deletions
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144
drivers/gpu/drm/i915/gt/selftest_hangcheck.c
View File

@ -540,6 +540,149 @@ static int igt_reset_nop_engine(void *arg)
return 0;
}
static void force_reset_timeout(struct intel_engine_cs *engine)
{
engine->reset_timeout.probability = 999;
atomic_set(&engine->reset_timeout.times, -1);
}
static void cancel_reset_timeout(struct intel_engine_cs *engine)
{
memset(&engine->reset_timeout, 0, sizeof(engine->reset_timeout));
}
static int igt_reset_fail_engine(void *arg)
{
struct intel_gt *gt = arg;
struct intel_engine_cs *engine;
enum intel_engine_id id;
/* Check that we can recover from engine-reset failues */
if (!intel_has_reset_engine(gt))
return 0;
for_each_engine(engine, gt, id) {
unsigned int count;
struct intel_context *ce;
IGT_TIMEOUT(end_time);
int err;
ce = intel_context_create(engine);
if (IS_ERR(ce))
return PTR_ERR(ce);
st_engine_heartbeat_disable(engine);
set_bit(I915_RESET_ENGINE + id, &gt->reset.flags);
force_reset_timeout(engine);
err = intel_engine_reset(engine, NULL);
cancel_reset_timeout(engine);
if (err == 0) /* timeouts only generated on gen8+ */
goto skip;
count = 0;
do {
struct i915_request *last = NULL;
int i;
if (!wait_for_idle(engine)) {
pr_err("%s failed to idle before reset\n",
engine->name);
err = -EIO;
break;
}
for (i = 0; i < count % 15; i++) {
struct i915_request *rq;
rq = intel_context_create_request(ce);
if (IS_ERR(rq)) {
struct drm_printer p =
drm_info_printer(gt->i915->drm.dev);
intel_engine_dump(engine, &p,
"%s(%s): failed to submit request\n",
__func__,
engine->name);
GEM_TRACE("%s(%s): failed to submit request\n",
__func__,
engine->name);
GEM_TRACE_DUMP();
intel_gt_set_wedged(gt);
if (last)
i915_request_put(last);
err = PTR_ERR(rq);
goto out;
}
if (last)
i915_request_put(last);
last = i915_request_get(rq);
i915_request_add(rq);
}
if (count & 1) {
err = intel_engine_reset(engine, NULL);
if (err) {
GEM_TRACE_ERR("intel_engine_reset(%s) failed, err:%d\n",
engine->name, err);
GEM_TRACE_DUMP();
i915_request_put(last);
break;
}
} else {
force_reset_timeout(engine);
err = intel_engine_reset(engine, NULL);
cancel_reset_timeout(engine);
if (err != -ETIMEDOUT) {
pr_err("intel_engine_reset(%s) did not fail, err:%d\n",
engine->name, err);
i915_request_put(last);
break;
}
}
err = 0;
if (last) {
if (i915_request_wait(last, 0, HZ / 2) < 0) {
struct drm_printer p =
drm_info_printer(gt->i915->drm.dev);
intel_engine_dump(engine, &p,
"%s(%s): failed to complete request\n",
__func__,
engine->name);
GEM_TRACE("%s(%s): failed to complete request\n",
__func__,
engine->name);
GEM_TRACE_DUMP();
err = -EIO;
}
i915_request_put(last);
}
count++;
} while (err == 0 && time_before(jiffies, end_time));
out:
pr_info("%s(%s): %d resets\n", __func__, engine->name, count);
skip:
clear_bit(I915_RESET_ENGINE + id, &gt->reset.flags);
st_engine_heartbeat_enable(engine);
intel_context_put(ce);
if (igt_flush_test(gt->i915))
err = -EIO;
if (err)
return err;
}
return 0;
}
static int __igt_reset_engine(struct intel_gt *gt, bool active)
{
struct i915_gpu_error *global = &gt->i915->gpu_error;
@ -1694,6 +1837,7 @@ int intel_hangcheck_live_selftests(struct drm_i915_private *i915)
SUBTEST(igt_reset_nop_engine),
SUBTEST(igt_reset_idle_engine),
SUBTEST(igt_reset_active_engine),
SUBTEST(igt_reset_fail_engine),
SUBTEST(igt_reset_engines),
SUBTEST(igt_reset_engines_atomic),
SUBTEST(igt_reset_queue),