drm/i915: Pull seqno started checks together

We have a few instances of checking seqno-1 to see if the HW has started
the request. Pull those together under a helper.

v2: Pull the !seqno assertion higher, as given seqno==1 we may indeed
check to see if we have started using seqno==0.

Suggested-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180806112605.20725-1-chris@chris-wilson.co.uk

1 files changed, 25 insertions, 14 deletions

diff --git a/drivers/gpu/drm/i915/i915_request.h b/drivers/gpu/drm/i915/i915_request.h
index e1c9365dfefb..9898301ab7ef 100644
--- a/drivers/gpu/drm/i915/i915_request.h
+++ b/drivers/gpu/drm/i915/i915_request.h
@@ -272,7 +272,10 @@ long i915_request_wait(struct i915_request *rq,
 #define I915_WAIT_ALL		BIT(2) /* used by i915_gem_object_wait() */
 #define I915_WAIT_FOR_IDLE_BOOST BIT(3)
 
-static inline u32 intel_engine_get_seqno(struct intel_engine_cs *engine);
+static inline bool intel_engine_has_started(struct intel_engine_cs *engine,
+					    u32 seqno);
+static inline bool intel_engine_has_completed(struct intel_engine_cs *engine,
+					      u32 seqno);
 
 /**
  * Returns true if seq1 is later than seq2.
@@ -282,11 +285,31 @@ static inline bool i915_seqno_passed(u32 seq1, u32 seq2)
 	return (s32)(seq1 - seq2) >= 0;
 }
 
+/**
+ * i915_request_started - check if the request has begun being executed
+ * @rq: the request
+ *
+ * Returns true if the request has been submitted to hardware, and the hardware
+ * has advanced passed the end of the previous request and so should be either
+ * currently processing the request (though it may be preempted and so
+ * not necessarily the next request to complete) or have completed the request.
+ */
+static inline bool i915_request_started(const struct i915_request *rq)
+{
+	u32 seqno;
+
+	seqno = i915_request_global_seqno(rq);
+	if (!seqno) /* not yet submitted to HW */
+		return false;
+
+	return intel_engine_has_started(rq->engine, seqno);
+}
+
 static inline bool
 __i915_request_completed(const struct i915_request *rq, u32 seqno)
 {
 	GEM_BUG_ON(!seqno);
-	return i915_seqno_passed(intel_engine_get_seqno(rq->engine), seqno) &&
+	return intel_engine_has_completed(rq->engine, seqno) &&
 		seqno == i915_request_global_seqno(rq);
 }
 
@@ -301,18 +324,6 @@ static inline bool i915_request_completed(const struct i915_request *rq)
 	return __i915_request_completed(rq, seqno);
 }
 
-static inline bool i915_request_started(const struct i915_request *rq)
-{
-	u32 seqno;
-
-	seqno = i915_request_global_seqno(rq);
-	if (!seqno)
-		return false;
-
-	return i915_seqno_passed(intel_engine_get_seqno(rq->engine),
-				 seqno - 1);
-}
-
 static inline bool i915_sched_node_signaled(const struct i915_sched_node *node)
 {
 	const struct i915_request *rq =