drm/i915/guc: keep breadcrumb irq always enabled

We rely on the tasklet to update the GT PM refcount, so we can't disable
it even if we've processed all the requests for the engine because we
might have detected the request completion before the interrupt arrived.

Since on all platforms on which we plan to support guc submission we
don't allow disabling the breadcrumb interrupts, we can further siplify
the park/unpark flow by removing the interrupt pin/unpin. A BUG_ON has
been added to catch changes to this flow that would require us to
restore some kind of pinning.

v2: split removal of engine_pin/unpin_breadcrumbs_irq to its own
    patch (chris)
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190812233152.2172-1-daniele.ceraolospurio@intel.com

drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c

@@ -1059,18 +1059,6 @@ static void guc_interrupts_release(struct intel_gt *gt)
 	rps->pm_intrmsk_mbz &= ~ARAT_EXPIRED_INTRMSK;
 }
 
-static void guc_submission_park(struct intel_engine_cs *engine)
-{
-	intel_engine_unpin_breadcrumbs_irq(engine);
-	engine->flags &= ~I915_ENGINE_NEEDS_BREADCRUMB_TASKLET;
-}
-
-static void guc_submission_unpark(struct intel_engine_cs *engine)
-{
-	engine->flags |= I915_ENGINE_NEEDS_BREADCRUMB_TASKLET;
-	intel_engine_pin_breadcrumbs_irq(engine);
-}
-
 static void guc_set_default_submission(struct intel_engine_cs *engine)
 {
 	/*
@@ -1088,8 +1076,8 @@ static void guc_set_default_submission(struct intel_engine_cs *engine)
 
 	engine->execlists.tasklet.func = guc_submission_tasklet;
 
-	engine->park = guc_submission_park;
-	engine->unpark = guc_submission_unpark;
+	/* do not use execlists park/unpark */
+	engine->park = engine->unpark = NULL;
 
 	engine->reset.prepare = guc_reset_prepare;
 	engine->reset.reset = guc_reset;
@@ -1098,6 +1086,15 @@ static void guc_set_default_submission(struct intel_engine_cs *engine)
 	engine->cancel_requests = guc_cancel_requests;
 
 	engine->flags &= ~I915_ENGINE_SUPPORTS_STATS;
+	engine->flags |= I915_ENGINE_NEEDS_BREADCRUMB_TASKLET;
+
+	/*
+	 * For the breadcrumb irq to work we need the interrupts to stay
+	 * enabled. However, on all platforms on which we'll have support for
+	 * GuC submission we don't allow disabling the interrupts at runtime, so
+	 * we're always safe with the current flow.
+	 */
+	GEM_BUG_ON(engine->irq_enable || engine->irq_disable);
 }
 
 int intel_guc_submission_enable(struct intel_guc *guc)