[Intel-gfx] [PATCH 29/39] drm/i915: Use b->irq_enable() as predicate for mock engine

[Chris Wilson]

References: d4ccceb05591 ("drm/i915/icl: Ringbuffer interrupt handling")
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/intel_breadcrumbs.c     | 39 ++++++++------------
 drivers/gpu/drm/i915/intel_engine_cs.c       | 11 ++----
 drivers/gpu/drm/i915/intel_ringbuffer.h      |  1 -
 drivers/gpu/drm/i915/selftests/mock_engine.c |  1 -
 4 files changed, 20 insertions(+), 32 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_breadcrumbs.c b/drivers/gpu/drm/i915/intel_breadcrumbs.c
index 4ed7105d7ff5..7b517bf83507 100644
--- a/drivers/gpu/drm/i915/intel_breadcrumbs.c
+++ b/drivers/gpu/drm/i915/intel_breadcrumbs.c
@@ -158,6 +158,9 @@ static void intel_breadcrumbs_fake_irq(struct timer_list *t)
 
 static void irq_enable(struct intel_engine_cs *engine)
 {
+	if (!engine->irq_enable)
+		return;
+
 	/*
 	 * FIXME: Ideally we want this on the API boundary, but for the
 	 * sake of testing with mock breadcrumbs (no HW so unable to
@@ -167,21 +170,20 @@ static void irq_enable(struct intel_engine_cs *engine)
 	GEM_BUG_ON(!intel_irqs_enabled(engine->i915));
 
 	/* Caller disables interrupts */
-	if (engine->irq_enable) {
-		spin_lock(&engine->i915->irq_lock);
-		engine->irq_enable(engine);
-		spin_unlock(&engine->i915->irq_lock);
-	}
+	spin_lock(&engine->i915->irq_lock);
+	engine->irq_enable(engine);
+	spin_unlock(&engine->i915->irq_lock);
 }
 
 static void irq_disable(struct intel_engine_cs *engine)
 {
+	if (!engine->irq_disable)
+		return;
+
 	/* Caller disables interrupts */
-	if (engine->irq_disable) {
-		spin_lock(&engine->i915->irq_lock);
-		engine->irq_disable(engine);
-		spin_unlock(&engine->i915->irq_lock);
-	}
+	spin_lock(&engine->i915->irq_lock);
+	engine->irq_disable(engine);
+	spin_unlock(&engine->i915->irq_lock);
 }
 
 void __intel_engine_disarm_breadcrumbs(struct intel_engine_cs *engine)
@@ -293,25 +295,16 @@ static bool __intel_breadcrumbs_enable_irq(struct intel_breadcrumbs *b)
 	if (b->irq_armed)
 		return false;
 
-	/* The breadcrumb irq will be disarmed on the interrupt after the
+	/*
+	 * The breadcrumb irq will be disarmed on the interrupt after the
 	 * waiters are signaled. This gives us a single interrupt window in
 	 * which we can add a new waiter and avoid the cost of re-enabling
 	 * the irq.
 	 */
 	b->irq_armed = true;
 
-	if (I915_SELFTEST_ONLY(b->mock)) {
-		/* For our mock objects we want to avoid interaction
-		 * with the real hardware (which is not set up). So
-		 * we simply pretend we have enabled the powerwell
-		 * and the irq, and leave it up to the mock
-		 * implementation to call intel_engine_wakeup()
-		 * itself when it wants to simulate a user interrupt,
-		 */
-		return true;
-	}
-
-	/* Since we are waiting on a request, the GPU should be busy
+	/*
+	 * Since we are waiting on a request, the GPU should be busy
 	 * and should have its own rpm reference. This is tracked
 	 * by i915->gt.awake, we can forgo holding our own wakref
 	 * for the interrupt as before i915->gt.awake is released (when
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index 36177546f68b..7b80a087cc32 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -917,6 +917,9 @@ static bool ring_is_idle(struct intel_engine_cs *engine)
 	intel_wakeref_t wakeref;
 	bool idle = true;
 
+	if (I915_SELFTEST_ONLY(!engine->mmio_base))
+		return true;
+
 	/* If the whole device is asleep, the engine must be idle */
 	wakeref = intel_runtime_pm_get_if_in_use(dev_priv);
 	if (!wakeref)
@@ -955,9 +958,6 @@ bool intel_engine_is_idle(struct intel_engine_cs *engine)
 	if (!intel_engine_signaled(engine, intel_engine_last_submit(engine)))
 		return false;
 
-	if (I915_SELFTEST_ONLY(engine->breadcrumbs.mock))
-		return true;
-
 	/* Waiting to drain ELSP? */
 	if (READ_ONCE(engine->execlists.active)) {
 		struct tasklet_struct *t = &engine->execlists.tasklet;
@@ -983,10 +983,7 @@ bool intel_engine_is_idle(struct intel_engine_cs *engine)
 		return false;
 
 	/* Ring stopped? */
-	if (!ring_is_idle(engine))
-		return false;
-
-	return true;
+	return ring_is_idle(engine);
 }
 
 bool intel_engines_are_idle(struct drm_i915_private *dev_priv)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index bedb25d27469..452c13f3dded 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -397,7 +397,6 @@ struct intel_engine_cs {
 		unsigned int irq_count;
 
 		bool irq_armed : 1;
-		I915_SELFTEST_DECLARE(bool mock : 1);
 	} breadcrumbs;
 
 	struct {
diff --git a/drivers/gpu/drm/i915/selftests/mock_engine.c b/drivers/gpu/drm/i915/selftests/mock_engine.c
index 50e1a0b1af7e..9fe5b2c8f8d4 100644
--- a/drivers/gpu/drm/i915/selftests/mock_engine.c
+++ b/drivers/gpu/drm/i915/selftests/mock_engine.c
@@ -201,7 +201,6 @@ struct intel_engine_cs *mock_engine(struct drm_i915_private *i915,
 	i915_timeline_set_subclass(&engine->base.timeline, TIMELINE_ENGINE);
 
 	intel_engine_init_breadcrumbs(&engine->base);
-	engine->base.breadcrumbs.mock = true; /* prevent touching HW for irqs */
 
 	/* fake hw queue */
 	spin_lock_init(&engine->hw_lock);
-- 
2.20.1