On 12/12/2018 13:41, Chris Wilson wrote:
We currently require that our per-engine reset can be called from any
context, even hardirq, and in the future wish to perform the device
reset without holding struct_mutex (which requires some lockless
shenanigans that demand the lowlevel intel_reset_gpu() be able to be
used in atomic context). Test that we meet the current requirements by
calling i915_reset_engine() from under various atomic contexts.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
---
.../gpu/drm/i915/selftests/intel_hangcheck.c | 172 ++++++++++++++++++
1 file changed, 172 insertions(+)
diff --git a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
index 65c318d14077..5f2f67b149af 100644
--- a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
+++ b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
@@ -1470,6 +1470,177 @@ static int igt_handle_error(void *arg)
return err;
}
+static void __preempt_begin(void)
+{
+ preempt_disable();
+}
+
+static void __preempt_end(void)
+{
+ preempt_enable();
+}
+
+static void __softirq_begin(void)
+{
+ local_bh_disable();
+}
+
+static void __softirq_end(void)
+{
+ local_bh_enable();
+}
+
+static void __hardirq_begin(void)
+{
+ local_irq_disable();
+}
+
+static void __hardirq_end(void)
+{
+ local_irq_enable();
+}
+
+struct atomic_section {
+ const char *name;
+ void (*critical_section_begin)(void);
+ void (*critical_section_end)(void);
+};
+
+static int __igt_atomic_reset_engine(struct intel_engine_cs *engine,
+ const struct atomic_section *p,
+ const char *mode)
+{
+ struct tasklet_struct * const t = &engine->execlists.tasklet;
+ int err;
+
+ GEM_TRACE("i915_reset_engine(%s:%s) under %s\n",
+ engine->name, mode, p->name);
+
+ tasklet_disable_nosync(t);
+ p->critical_section_begin();
+
+ err = i915_reset_engine(engine, NULL);
+
+ p->critical_section_end();
+ tasklet_enable(t);
+
+ if (err)
+ pr_err("i915_reset_engine(%s:%s) failed under %s\n",
+ engine->name, mode, p->name);
+
+ return err;
+}
+
+static int igt_atomic_reset_engine(struct intel_engine_cs *engine,
+ const struct atomic_section *p)
+{
+ struct drm_i915_private *i915 = engine->i915;
+ struct i915_request *rq;
+ struct hang h;
+ int err;
+
+ err = __igt_atomic_reset_engine(engine, p, "idle");
+ if (err)
+ return err;
+
+ err = hang_init(&h, i915);
+ if (err)
+ return err;
+
+ rq = hang_create_request(&h, engine);
+ if (IS_ERR(rq)) {
+ err = PTR_ERR(rq);
+ goto out;
+ }
+
+ i915_request_get(rq);
+ i915_request_add(rq);
+
+ if (wait_until_running(&h, rq)) {
+ err = __igt_atomic_reset_engine(engine, p, "active");
+ } else {
+ pr_err("%s(%s): Failed to start request %llx, at %x\n",
+ __func__, engine->name,
+ rq->fence.seqno, hws_seqno(&h, rq));
+ err = -EIO;
+ }
+
+ if (err == 0) {
+ struct igt_wedge_me w;
+
+ igt_wedge_on_timeout(&w, i915, HZ / 20 /* 50ms timeout*/)
+ i915_request_wait(rq,
+ I915_WAIT_LOCKED,
+ MAX_SCHEDULE_TIMEOUT);
+ if (i915_terminally_wedged(&i915->gpu_error))
+ err = -EIO;
+ }
+
+ i915_request_put(rq);
+out:
+ hang_fini(&h);
+ return err;
+}
+
+static void force_reset(struct drm_i915_private *i915)
+{
+ i915_gem_set_wedged(i915);
+ set_bit(I915_RESET_HANDOFF, &i915->gpu_error.flags);
+ i915_reset(i915, 0, NULL);
+}
+
+static int igt_atomic_reset(void *arg)
+{
+ static const struct atomic_section phases[] = {
+ { "preempt", __preempt_begin, __preempt_end },
+ { "softirq", __softirq_begin, __softirq_end },
+ { "hardirq", __hardirq_begin, __hardirq_end },
+ { }
+ };
+ struct drm_i915_private *i915 = arg;
+ int err = 0;
+
+ /* Check that the resets are usable from atomic context */
+
+ if (USES_GUC_SUBMISSION(i915))
+ return 0; /* guc is dead; long live the guc */
+
+ igt_global_reset_lock(i915);
+ mutex_lock(&i915->drm.struct_mutex);
+ intel_runtime_pm_get(i915);
+
+ /* Flush any requests before we get started and check basics */
+ force_reset(i915);
+ if (i915_terminally_wedged(&i915->gpu_error))
+ goto unlock;
+
+ if (intel_has_reset_engine(i915)) {
This check could/should go earlier.
+ struct intel_engine_cs *engine;
+ enum intel_engine_id id;
+
+ for_each_engine(engine, i915, id) {
+ const typeof(*phases) *p;
+
+ for (p = phases; p->name; p++) {
+ err = igt_atomic_reset_engine(engine, p);
+ if (err)
+ goto out;
+ }
+ }
+ }
+
+out:
+ /* As we poke around the guts, do a full reset before continuing. */
+ force_reset(i915);
+
+unlock:
+ intel_runtime_pm_put(i915);
+ mutex_unlock(&i915->drm.struct_mutex);
+ igt_global_reset_unlock(i915);
+
+ return err;
+}
+
int intel_hangcheck_live_selftests(struct drm_i915_private *i915)
{
static const struct i915_subtest tests[] = {
@@ -1485,6 +1656,7 @@ int intel_hangcheck_live_selftests(struct drm_i915_private *i915)
SUBTEST(igt_reset_evict_ppgtt),
SUBTEST(igt_reset_evict_fence),
SUBTEST(igt_handle_error),
+ SUBTEST(igt_atomic_reset),
};
bool saved_hangcheck;
int err;
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Regards,
Tvrtko
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