drm/i915: Report execlists irq bit in debugfs

As part of the knowing whether there is outstanding data in the CSB,
also check whether there is an outstanding IRQ notification.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170721123238.16428-1-chris@chris-wilson.co.ukSigned-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_debugfs.c

@@ -3325,8 +3325,10 @@ static int i915_engine_info(struct seq_file *m, void *unused)
 			ptr = I915_READ(RING_CONTEXT_STATUS_PTR(engine));
 			read = GEN8_CSB_READ_PTR(ptr);
 			write = GEN8_CSB_WRITE_PTR(ptr);
-			seq_printf(m, "\tExeclist CSB read %d, write %d\n",
-				   read, write);
+			seq_printf(m, "\tExeclist CSB read %d, write %d, interrupt posted? %s\n",
+				   read, write,
+				   yesno(test_bit(ENGINE_IRQ_EXECLIST,
+						  &engine->irq_posted)));
 			if (read >= GEN8_CSB_ENTRIES)
 				read = 0;
 			if (write >= GEN8_CSB_ENTRIES)