drm/i915: Drop fake breadcrumb irq

Missed breadcrumb detection is defunct due to the tight coupling with
dma_fence signaling and the myriad ways we may signal fences from
everywhere but from an interrupt, i.e. we frequently signal a fence
before we even see its interrupt. This means that even if we miss an
interrupt for a fence, it still is signaled before our breadcrumb
hangcheck fires, so simplify the breadcrumb hangchecking by moving it
into the GPU hangcheck and forgo fake interrupts.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190129205230.19056-3-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_debugfs.c

@@ -1321,9 +1321,6 @@ static int i915_hangcheck_info(struct seq_file *m, void *unused)
 			   intel_engine_last_submit(engine),
 			   jiffies_to_msecs(jiffies -
 					    engine->hangcheck.action_timestamp));
-		seq_printf(m, "\tfake irq active? %s\n",
-			   yesno(test_bit(engine->id,
-					  &dev_priv->gpu_error.missed_irq_rings)));
 
 		seq_printf(m, "\tACTHD = 0x%08llx [current 0x%08llx]\n",
 			   (long long)engine->hangcheck.acthd,
@@ -3899,94 +3896,6 @@ DEFINE_SIMPLE_ATTRIBUTE(i915_wedged_fops,
 			i915_wedged_get, i915_wedged_set,
 			"%llu\n");
 
-static int
-fault_irq_set(struct drm_i915_private *i915,
-	      unsigned long *irq,
-	      unsigned long val)
-{
-	int err;
-
-	err = mutex_lock_interruptible(&i915->drm.struct_mutex);
-	if (err)
-		return err;
-
-	err = i915_gem_wait_for_idle(i915,
-				     I915_WAIT_LOCKED |
-				     I915_WAIT_INTERRUPTIBLE,
-				     MAX_SCHEDULE_TIMEOUT);
-	if (err)
-		goto err_unlock;
-
-	*irq = val;
-	mutex_unlock(&i915->drm.struct_mutex);
-
-	/* Flush idle worker to disarm irq */
-	drain_delayed_work(&i915->gt.idle_work);
-
-	return 0;
-
-err_unlock:
-	mutex_unlock(&i915->drm.struct_mutex);
-	return err;
-}
-
-static int
-i915_ring_missed_irq_get(void *data, u64 *val)
-{
-	struct drm_i915_private *dev_priv = data;
-
-	*val = dev_priv->gpu_error.missed_irq_rings;
-	return 0;
-}
-
-static int
-i915_ring_missed_irq_set(void *data, u64 val)
-{
-	struct drm_i915_private *i915 = data;
-
-	return fault_irq_set(i915, &i915->gpu_error.missed_irq_rings, val);
-}
-
-DEFINE_SIMPLE_ATTRIBUTE(i915_ring_missed_irq_fops,
-			i915_ring_missed_irq_get, i915_ring_missed_irq_set,
-			"0x%08llx\n");
-
-static int
-i915_ring_test_irq_get(void *data, u64 *val)
-{
-	struct drm_i915_private *dev_priv = data;
-
-	*val = dev_priv->gpu_error.test_irq_rings;
-
-	return 0;
-}
-
-static int
-i915_ring_test_irq_set(void *data, u64 val)
-{
-	struct drm_i915_private *i915 = data;
-
-	/* GuC keeps the user interrupt permanently enabled for submission */
-	if (USES_GUC_SUBMISSION(i915))
-		return -ENODEV;
-
-	/*
-	 * From icl, we can no longer individually mask interrupt generation
-	 * from each engine.
-	 */
-	if (INTEL_GEN(i915) >= 11)
-		return -ENODEV;
-
-	val &= INTEL_INFO(i915)->ring_mask;
-	DRM_DEBUG_DRIVER("Masking interrupts on rings 0x%08llx\n", val);
-
-	return fault_irq_set(i915, &i915->gpu_error.test_irq_rings, val);
-}
-
-DEFINE_SIMPLE_ATTRIBUTE(i915_ring_test_irq_fops,
-			i915_ring_test_irq_get, i915_ring_test_irq_set,
-			"0x%08llx\n");
-
 #define DROP_UNBOUND	BIT(0)
 #define DROP_BOUND	BIT(1)
 #define DROP_RETIRE	BIT(2)
@@ -4750,8 +4659,6 @@ static const struct i915_debugfs_files {
 } i915_debugfs_files[] = {
 	{"i915_wedged", &i915_wedged_fops},
 	{"i915_cache_sharing", &i915_cache_sharing_fops},
-	{"i915_ring_missed_irq", &i915_ring_missed_irq_fops},
-	{"i915_ring_test_irq", &i915_ring_test_irq_fops},
 	{"i915_gem_drop_caches", &i915_drop_caches_fops},
 #if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
 	{"i915_error_state", &i915_error_state_fops},

drivers/gpu/drm/i915/i915_gpu_error.c

@@ -723,8 +723,6 @@ static void __err_print_to_sgl(struct drm_i915_error_state_buf *m,
 	err_printf(m, "FORCEWAKE: 0x%08x\n", error->forcewake);
 	err_printf(m, "DERRMR: 0x%08x\n", error->derrmr);
 	err_printf(m, "CCID: 0x%08x\n", error->ccid);
-	err_printf(m, "Missed interrupts: 0x%08lx\n",
-		   m->i915->gpu_error.missed_irq_rings);
 
 	for (i = 0; i < error->nfence; i++)
 		err_printf(m, "  fence[%d] = %08llx\n", i, error->fence[i]);

drivers/gpu/drm/i915/i915_gpu_error.h

@@ -204,8 +204,6 @@ struct i915_gpu_error {
 
 	atomic_t pending_fb_pin;
 
-	unsigned long missed_irq_rings;
-
 	/**
 	 * State variable controlling the reset flow and count
 	 *
@@ -274,9 +272,6 @@ struct i915_gpu_error {
 	 */
 	wait_queue_head_t reset_queue;
 
-	/* For missed irq/seqno simulation. */
-	unsigned long test_irq_rings;
-
 	struct i915_gpu_restart *restart;
 };
 

drivers/gpu/drm/i915/intel_breadcrumbs.c

@@ -91,7 +91,6 @@ bool intel_engine_breadcrumbs_irq(struct intel_engine_cs *engine)
 
 	spin_lock(&b->irq_lock);
 
-	b->irq_fired = true;
 	if (b->irq_armed && list_empty(&b->signalers))
 		__intel_breadcrumbs_disarm_irq(b);
 
@@ -172,86 +171,6 @@ static void signal_irq_work(struct irq_work *work)
 	intel_engine_breadcrumbs_irq(engine);
 }
 
-static unsigned long wait_timeout(void)
-{
-	return round_jiffies_up(jiffies + DRM_I915_HANGCHECK_JIFFIES);
-}
-
-static noinline void missed_breadcrumb(struct intel_engine_cs *engine)
-{
-	if (GEM_SHOW_DEBUG()) {
-		struct drm_printer p = drm_debug_printer(__func__);
-
-		intel_engine_dump(engine, &p,
-				  "%s missed breadcrumb at %pS\n",
-				  engine->name, __builtin_return_address(0));
-	}
-
-	set_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings);
-}
-
-static void intel_breadcrumbs_hangcheck(struct timer_list *t)
-{
-	struct intel_engine_cs *engine =
-		from_timer(engine, t, breadcrumbs.hangcheck);
-	struct intel_breadcrumbs *b = &engine->breadcrumbs;
-
-	if (!b->irq_armed)
-		return;
-
-	if (b->irq_fired)
-		goto rearm;
-
-	/*
-	 * We keep the hangcheck timer alive until we disarm the irq, even
-	 * if there are no waiters at present.
-	 *
-	 * If the waiter was currently running, assume it hasn't had a chance
-	 * to process the pending interrupt (e.g, low priority task on a loaded
-	 * system) and wait until it sleeps before declaring a missed interrupt.
-	 *
-	 * If the waiter was asleep (and not even pending a wakeup), then we
-	 * must have missed an interrupt as the GPU has stopped advancing
-	 * but we still have a waiter. Assuming all batches complete within
-	 * DRM_I915_HANGCHECK_JIFFIES [1.5s]!
-	 */
-	synchronize_hardirq(engine->i915->drm.irq);
-	if (intel_engine_signal_breadcrumbs(engine)) {
-		missed_breadcrumb(engine);
-		mod_timer(&b->fake_irq, jiffies + 1);
-	} else {
-rearm:
-		b->irq_fired = false;
-		mod_timer(&b->hangcheck, wait_timeout());
-	}
-}
-
-static void intel_breadcrumbs_fake_irq(struct timer_list *t)
-{
-	struct intel_engine_cs *engine =
-		from_timer(engine, t, breadcrumbs.fake_irq);
-	struct intel_breadcrumbs *b = &engine->breadcrumbs;
-
-	/*
-	 * The timer persists in case we cannot enable interrupts,
-	 * or if we have previously seen seqno/interrupt incoherency
-	 * ("missed interrupt" syndrome, better known as a "missed breadcrumb").
-	 * Here the worker will wake up every jiffie in order to kick the
-	 * oldest waiter to do the coherent seqno check.
-	 */
-
-	if (!intel_engine_signal_breadcrumbs(engine) && !b->irq_armed)
-		return;
-
-	/* If the user has disabled the fake-irq, restore the hangchecking */
-	if (!test_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings)) {
-		mod_timer(&b->hangcheck, wait_timeout());
-		return;
-	}
-
-	mod_timer(&b->fake_irq, jiffies + 1);
-}
-
 void intel_engine_pin_breadcrumbs_irq(struct intel_engine_cs *engine)
 {
 	struct intel_breadcrumbs *b = &engine->breadcrumbs;
@@ -274,43 +193,14 @@ void intel_engine_unpin_breadcrumbs_irq(struct intel_engine_cs *engine)
 	spin_unlock_irq(&b->irq_lock);
 }
 
-static bool use_fake_irq(const struct intel_breadcrumbs *b)
+static void __intel_breadcrumbs_arm_irq(struct intel_breadcrumbs *b)
-{
-	const struct intel_engine_cs *engine =
-		container_of(b, struct intel_engine_cs, breadcrumbs);
-
-	if (!test_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings))
-		return false;
-
-	/*
-	 * Only start with the heavy weight fake irq timer if we have not
-	 * seen any interrupts since enabling it the first time. If the
-	 * interrupts are still arriving, it means we made a mistake in our
-	 * engine->seqno_barrier(), a timing error that should be transient
-	 * and unlikely to reoccur.
-	 */
-	return !b->irq_fired;
-}
-
-static void enable_fake_irq(struct intel_breadcrumbs *b)
-{
-	/* Ensure we never sleep indefinitely */
-	if (!b->irq_enabled || use_fake_irq(b))
-		mod_timer(&b->fake_irq, jiffies + 1);
-	else
-		mod_timer(&b->hangcheck, wait_timeout());
-}
-
-static bool __intel_breadcrumbs_arm_irq(struct intel_breadcrumbs *b)
 {
 	struct intel_engine_cs *engine =
 		container_of(b, struct intel_engine_cs, breadcrumbs);
-	struct drm_i915_private *i915 = engine->i915;
-	bool enabled;
 
 	lockdep_assert_held(&b->irq_lock);
 	if (b->irq_armed)
-		return false;
+		return;
 
 	/*
 	 * The breadcrumb irq will be disarmed on the interrupt after the
@@ -328,16 +218,8 @@ static bool __intel_breadcrumbs_arm_irq(struct intel_breadcrumbs *b)
 	 * the driver is idle) we disarm the breadcrumbs.
 	 */
 
-	/* No interrupts? Kick the waiter every jiffie! */
+	if (!b->irq_enabled++)
-	enabled = false;
-	if (!b->irq_enabled++ &&
-	    !test_bit(engine->id, &i915->gpu_error.test_irq_rings)) {
 		irq_enable(engine);
-		enabled = true;
-	}
-
-	enable_fake_irq(b);
-	return enabled;
 }
 
 void intel_engine_init_breadcrumbs(struct intel_engine_cs *engine)
@@ -348,18 +230,6 @@ void intel_engine_init_breadcrumbs(struct intel_engine_cs *engine)
 	INIT_LIST_HEAD(&b->signalers);
 
 	init_irq_work(&b->irq_work, signal_irq_work);
-
-	timer_setup(&b->fake_irq, intel_breadcrumbs_fake_irq, 0);
-	timer_setup(&b->hangcheck, intel_breadcrumbs_hangcheck, 0);
-}
-
-static void cancel_fake_irq(struct intel_engine_cs *engine)
-{
-	struct intel_breadcrumbs *b = &engine->breadcrumbs;
-
-	del_timer_sync(&b->fake_irq); /* may queue b->hangcheck */
-	del_timer_sync(&b->hangcheck);
-	clear_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings);
 }
 
 void intel_engine_reset_breadcrumbs(struct intel_engine_cs *engine)
@@ -369,13 +239,6 @@ void intel_engine_reset_breadcrumbs(struct intel_engine_cs *engine)
 
 	spin_lock_irqsave(&b->irq_lock, flags);
 
-	/*
-	 * Leave the fake_irq timer enabled (if it is running), but clear the
-	 * bit so that it turns itself off on its next wake up and goes back
-	 * to the long hangcheck interval if still required.
-	 */
-	clear_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings);
-
 	if (b->irq_enabled)
 		irq_enable(engine);
 	else
@@ -386,7 +249,6 @@ void intel_engine_reset_breadcrumbs(struct intel_engine_cs *engine)
 
 void intel_engine_fini_breadcrumbs(struct intel_engine_cs *engine)
 {
-	cancel_fake_irq(engine);
 }
 
 bool i915_request_enable_breadcrumb(struct i915_request *rq)
@@ -482,7 +344,4 @@ void intel_engine_print_breadcrumbs(struct intel_engine_cs *engine,
 		}
 	}
 	spin_unlock_irq(&b->irq_lock);
-
-	if (test_bit(engine->id, &engine->i915->gpu_error.missed_irq_rings))
-		drm_printf(p, "Fake irq active\n");
 }

drivers/gpu/drm/i915/intel_hangcheck.c

@@ -275,6 +275,8 @@ static void i915_hangcheck_elapsed(struct work_struct *work)
 	for_each_engine(engine, dev_priv, id) {
 		struct hangcheck hc;
 
+		intel_engine_signal_breadcrumbs(engine);
+
 		hangcheck_load_sample(engine, &hc);
 		hangcheck_accumulate_sample(engine, &hc);
 		hangcheck_store_sample(engine, &hc);

drivers/gpu/drm/i915/intel_ringbuffer.h

@@ -387,14 +387,9 @@ struct intel_engine_cs {
 
 		struct irq_work irq_work; /* for use from inside irq_lock */
 
-		struct timer_list fake_irq; /* used after a missed interrupt */
-		struct timer_list hangcheck; /* detect missed interrupts */
-
-		unsigned int hangcheck_interrupts;
 		unsigned int irq_enabled;
 
 		bool irq_armed;
-		bool irq_fired;
 	} breadcrumbs;
 
 	struct {

drivers/gpu/drm/i915/selftests/igt_live_test.c

@@ -35,7 +35,6 @@ int igt_live_test_begin(struct igt_live_test *t,
 		return err;
 	}
 
-	i915->gpu_error.missed_irq_rings = 0;
 	t->reset_global = i915_reset_count(&i915->gpu_error);
 
 	for_each_engine(engine, i915, id)
@@ -75,11 +74,5 @@ int igt_live_test_end(struct igt_live_test *t)
 		return -EIO;
 	}
 
-	if (i915->gpu_error.missed_irq_rings) {
-		pr_err("%s(%s): Missed interrupts on engines %lx\n",
-		       t->func, t->name, i915->gpu_error.missed_irq_rings);
-		return -EIO;
-	}
-
 	return 0;
 }