drm/i915: store ring hangcheck action

For guilty batchbuffer analysis later on when rings are reset,
store what state the ring was on when hang was declared.
This helps to weed out the waiting rings from the active ones.
Signed-off-by: NMika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk>
Acked-by: NBen Widawsky <ben@bwidawsk.net>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_irq.c

@@ -2380,7 +2380,8 @@ static void semaphore_clear_deadlocks(struct drm_i915_private *dev_priv)
 		ring->hangcheck.deadlock = false;
 }
 
-static enum { wait, active, kick, hung } ring_stuck(struct intel_ring_buffer *ring, u32 acthd)
+static enum intel_ring_hangcheck_action
+ring_stuck(struct intel_ring_buffer *ring, u32 acthd)
 {
 	struct drm_device *dev = ring->dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -2483,7 +2484,10 @@ void i915_hangcheck_elapsed(unsigned long data)
 				 * being repeatedly kicked and so responsible
 				 * for stalling the machine.
 				 */
-				switch (ring_stuck(ring, acthd)) {
+				ring->hangcheck.action = ring_stuck(ring,
+								    acthd);
+
+				switch (ring->hangcheck.action) {
 				case wait:
 					score = 0;
 					break;

drivers/gpu/drm/i915/intel_ringbuffer.h

@@ -37,11 +37,14 @@ struct  intel_hw_status_page {
 #define I915_READ_SYNC_0(ring) I915_READ(RING_SYNC_0((ring)->mmio_base))
 #define I915_READ_SYNC_1(ring) I915_READ(RING_SYNC_1((ring)->mmio_base))
 
+enum intel_ring_hangcheck_action { wait, active, kick, hung };
+
 struct intel_ring_hangcheck {
 	bool deadlock;
 	u32 seqno;
 	u32 acthd;
 	int score;
+	enum intel_ring_hangcheck_action action;
 };
 
 struct  intel_ring_buffer {