drm/i915: Convert 'i915_seqno_passed' calls into 'i915_gem_request_completed'

Almost everywhere that caled i915_seqno_passed() was really asking 'has the
given seqno popped out of the hardware yet?'. Thus it had to query the current
hardware seqno and then do a signed delta comparison (which copes with wrapping
around zero but not with seqno values more than 2GB apart, although the latter
is unlikely!).

Now that the majority of seqno instances have been replaced with request
structures, it is possible to convert this test to be request based as well.
There is now a 'i915_gem_request_completed()' function which takes a request and
returns true or false as appropriate. Note that this currently just wraps up the
original _passed() test but a later patch in the series will reduce this to
simply returning a cached internal value, i.e.:
  _completed(req) { return req->completed; }'

This checkin converts almost all _seqno_passed() calls. The only one left is in
the semaphore code which still requires seqnos not request structures.

For: VIZ-4377
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: Thomas Daniel <Thomas.Daniel@intel.com>
[danvet: Drop hunk touching the trace_irq code since I've dropped the
patch which converts that, and resolve resulting conflict.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_debugfs.c

@@ -547,8 +547,7 @@ static int i915_gem_pageflip_info(struct seq_file *m, void *data)
 					   i915_gem_request_get_seqno(work->flip_queued_req),
 					   dev_priv->next_seqno,
 					   work->flip_queued_ring->get_seqno(work->flip_queued_ring, true),
-					   i915_seqno_passed(work->flip_queued_ring->get_seqno(work->flip_queued_ring, true),
-							     i915_gem_request_get_seqno(work->flip_queued_req)));
+					   i915_gem_request_completed(work->flip_queued_req, true));
 			} else
 				seq_printf(m, "Flip not associated with any ring\n");
 			seq_printf(m, "Flip queued on frame %d, (was ready on frame %d), now %d\n",

drivers/gpu/drm/i915/i915_drv.h

@@ -2062,6 +2062,12 @@ static inline void i915_gem_request_assign(struct drm_i915_gem_request **pdst,
 	*pdst = src;
 }
 
+/*
+ * XXX: i915_gem_request_completed should be here but currently needs the
+ * definition of i915_seqno_passed() which is below. It will be moved in
+ * a later patch when the call to i915_seqno_passed() is obsoleted...
+ */
+
 struct drm_i915_file_private {
 	struct drm_i915_private *dev_priv;
 	struct drm_file *file;
@@ -2563,6 +2569,18 @@ i915_seqno_passed(uint32_t seq1, uint32_t seq2)
 	return (int32_t)(seq1 - seq2) >= 0;
 }
 
+static inline bool i915_gem_request_completed(struct drm_i915_gem_request *req,
+					      bool lazy_coherency)
+{
+	u32 seqno;
+
+	BUG_ON(req == NULL);
+
+	seqno = req->ring->get_seqno(req->ring, lazy_coherency);
+
+	return i915_seqno_passed(seqno, req->seqno);
+}
+
 int __must_check i915_gem_get_seqno(struct drm_device *dev, u32 *seqno);
 int __must_check i915_gem_set_seqno(struct drm_device *dev, u32 seqno);
 int __must_check i915_gem_object_get_fence(struct drm_i915_gem_object *obj);

drivers/gpu/drm/i915/i915_gem.c

@@ -1223,8 +1223,7 @@ int __i915_wait_request(struct drm_i915_gem_request *req,
 
 	WARN(!intel_irqs_enabled(dev_priv), "IRQs disabled");
 
-	if (i915_seqno_passed(ring->get_seqno(ring, true),
-			      i915_gem_request_get_seqno(req)))
+	if (i915_gem_request_completed(req, true))
 		return 0;
 
 	timeout_expire = timeout ? jiffies + nsecs_to_jiffies((u64)*timeout) : 0;
@@ -1260,8 +1259,7 @@ int __i915_wait_request(struct drm_i915_gem_request *req,
 			break;
 		}
 
-		if (i915_seqno_passed(ring->get_seqno(ring, false),
-				      i915_gem_request_get_seqno(req))) {
+		if (i915_gem_request_completed(req, false)) {
 			ret = 0;
 			break;
 		}
@@ -2333,8 +2331,7 @@ i915_gem_object_retire(struct drm_i915_gem_object *obj)
 	if (ring == NULL)
 		return;
 
-	if (i915_seqno_passed(ring->get_seqno(ring, true),
-			      i915_gem_request_get_seqno(obj->last_read_req)))
+	if (i915_gem_request_completed(obj->last_read_req, true))
 		i915_gem_object_move_to_inactive(obj);
 }
 
@@ -2601,12 +2598,9 @@ struct drm_i915_gem_request *
 i915_gem_find_active_request(struct intel_engine_cs *ring)
 {
 	struct drm_i915_gem_request *request;
-	u32 completed_seqno;
-
-	completed_seqno = ring->get_seqno(ring, false);
 
 	list_for_each_entry(request, &ring->request_list, list) {
-		if (i915_seqno_passed(completed_seqno, request->seqno))
+		if (i915_gem_request_completed(request, false))
 			continue;
 
 		return request;
@@ -2734,15 +2728,11 @@ void i915_gem_reset(struct drm_device *dev)
 void
 i915_gem_retire_requests_ring(struct intel_engine_cs *ring)
 {
-	uint32_t seqno;
-
 	if (list_empty(&ring->request_list))
 		return;
 
 	WARN_ON(i915_verify_lists(ring->dev));
 
-	seqno = ring->get_seqno(ring, true);
-
 	/* Move any buffers on the active list that are no longer referenced
 	 * by the ringbuffer to the flushing/inactive lists as appropriate,
 	 * before we free the context associated with the requests.
@@ -2754,8 +2744,7 @@ i915_gem_retire_requests_ring(struct intel_engine_cs *ring)
 				      struct drm_i915_gem_object,
 				      ring_list);
 
-		if (!i915_seqno_passed(seqno,
-			     i915_gem_request_get_seqno(obj->last_read_req)))
+		if (!i915_gem_request_completed(obj->last_read_req, true))
 			break;
 
 		i915_gem_object_move_to_inactive(obj);
@@ -2770,7 +2759,7 @@ i915_gem_retire_requests_ring(struct intel_engine_cs *ring)
 					   struct drm_i915_gem_request,
 					   list);
 
-		if (!i915_seqno_passed(seqno, request->seqno))
+		if (!i915_gem_request_completed(request, true))
 			break;
 
 		trace_i915_gem_request_retire(request);
@@ -2797,7 +2786,8 @@ i915_gem_retire_requests_ring(struct intel_engine_cs *ring)
 	}
 
 	if (unlikely(ring->trace_irq_seqno &&
-		     i915_seqno_passed(seqno, ring->trace_irq_seqno))) {
+		     i915_seqno_passed(ring->get_seqno(ring, true),
+				       ring->trace_irq_seqno))) {
 		ring->irq_put(ring);
 		ring->trace_irq_seqno = 0;
 	}

drivers/gpu/drm/i915/i915_irq.c

@@ -2760,8 +2760,7 @@ static bool
 ring_idle(struct intel_engine_cs *ring)
 {
 	return (list_empty(&ring->request_list) ||
-		i915_seqno_passed(ring->get_seqno(ring, false),
-			i915_gem_request_get_seqno(ring_last_request(ring))));
+		i915_gem_request_completed(ring_last_request(ring), false));
 }
 
 static bool

drivers/gpu/drm/i915/intel_display.c

@@ -9742,11 +9742,7 @@ static bool __intel_pageflip_stall_check(struct drm_device *dev,
 
 	if (work->flip_ready_vblank == 0) {
 		if (work->flip_queued_ring) {
-			uint32_t s1 = work->flip_queued_ring->get_seqno(
-					       work->flip_queued_ring, true);
-			uint32_t s2 = i915_gem_request_get_seqno(
-						      work->flip_queued_req);
-			if (!i915_seqno_passed(s1, s2))
+			if (!i915_gem_request_completed(work->flip_queued_req, true))
 				return false;
 		}