[CI 07/20] drm/i915: Remove the lazy_coherency parameter from request-completed?

[Chris Wilson <chris@chris-wilson.co.uk>]

Now that we have split out the seqno-barrier from the
engine->get_seqno() callback itself, we can move the users of the
seqno-barrier to the required callsites simplifying the common code and
making the required workaround handling much more explicit.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_debugfs.c  |  2 +-
 drivers/gpu/drm/i915/i915_drv.h      | 17 ++++++++---------
 drivers/gpu/drm/i915/i915_gem.c      | 24 ++++++++++++++++--------
 drivers/gpu/drm/i915/intel_display.c |  2 +-
 drivers/gpu/drm/i915/intel_pm.c      |  4 ++--
 5 files changed, 28 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 02a923feeb7d..a4287d729fd9 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -632,7 +632,7 @@ 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,
 					   engine->get_seqno(engine),
-					   i915_gem_request_completed(work->flip_queued_req, true));
+					   i915_gem_request_completed(work->flip_queued_req));
 			} 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",
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 7b329464e8eb..6e24b404542d 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3142,20 +3142,14 @@ i915_seqno_passed(uint32_t seq1, uint32_t seq2)
 	return (int32_t)(seq1 - seq2) >= 0;
 }
 
-static inline bool i915_gem_request_started(struct drm_i915_gem_request *req,
-					   bool lazy_coherency)
+static inline bool i915_gem_request_started(struct drm_i915_gem_request *req)
 {
-	if (!lazy_coherency && req->engine->irq_seqno_barrier)
-		req->engine->irq_seqno_barrier(req->engine);
 	return i915_seqno_passed(req->engine->get_seqno(req->engine),
 				 req->previous_seqno);
 }
 
-static inline bool i915_gem_request_completed(struct drm_i915_gem_request *req,
-					      bool lazy_coherency)
+static inline bool i915_gem_request_completed(struct drm_i915_gem_request *req)
 {
-	if (!lazy_coherency && req->engine->irq_seqno_barrier)
-		req->engine->irq_seqno_barrier(req->engine);
 	return i915_seqno_passed(req->engine->get_seqno(req->engine),
 				 req->seqno);
 }
@@ -3823,6 +3817,8 @@ static inline void i915_trace_irq_get(struct intel_engine_cs *engine,
 
 static inline bool __i915_request_irq_complete(struct drm_i915_gem_request *req)
 {
+	struct intel_engine_cs *engine = req->engine;
+
 	/* Ensure our read of the seqno is coherent so that we
 	 * do not "miss an interrupt" (i.e. if this is the last
 	 * request and the seqno write from the GPU is not visible
@@ -3834,7 +3830,10 @@ static inline bool __i915_request_irq_complete(struct drm_i915_gem_request *req)
 	 * but it is easier and safer to do it every time the waiter
 	 * is woken.
 	 */
-	if (i915_gem_request_completed(req, false))
+	if (engine->irq_seqno_barrier)
+		engine->irq_seqno_barrier(engine);
+
+	if (i915_gem_request_completed(req))
 		return true;
 
 	/* We need to check whether any gpu reset happened in between
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 9348b5d7de0e..16ef7682ed0c 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1171,12 +1171,12 @@ static bool __i915_spin_request(struct drm_i915_gem_request *req, int state)
 	 */
 
 	/* Only spin if we know the GPU is processing this request */
-	if (!i915_gem_request_started(req, true))
+	if (!i915_gem_request_started(req))
 		return false;
 
 	timeout = local_clock_us(&cpu) + 5;
 	do {
-		if (i915_gem_request_completed(req, true))
+		if (i915_gem_request_completed(req))
 			return true;
 
 		if (signal_pending_state(state, current))
@@ -1223,7 +1223,7 @@ int __i915_wait_request(struct drm_i915_gem_request *req,
 	if (list_empty(&req->list))
 		return 0;
 
-	if (i915_gem_request_completed(req, true))
+	if (i915_gem_request_completed(req))
 		return 0;
 
 	timeout_remain = MAX_SCHEDULE_TIMEOUT;
@@ -2776,8 +2776,16 @@ i915_gem_find_active_request(struct intel_engine_cs *engine)
 {
 	struct drm_i915_gem_request *request;
 
+	/* We are called by the error capture and reset at a random
+	 * point in time. In particular, note that neither is crucially
+	 * ordered with an interrupt. After a hang, the GPU is dead and we
+	 * assume that no more writes can happen (we waited long enough for
+	 * all writes that were in transaction to be flushed) - adding an
+	 * extra delay for a recent interrupt is pointless. Hence, we do
+	 * not need an engine->irq_seqno_barrier() before the seqno reads.
+	 */
 	list_for_each_entry(request, &engine->request_list, list) {
-		if (i915_gem_request_completed(request, false))
+		if (i915_gem_request_completed(request))
 			continue;
 
 		return request;
@@ -2908,7 +2916,7 @@ i915_gem_retire_requests_ring(struct intel_engine_cs *engine)
 					   struct drm_i915_gem_request,
 					   list);
 
-		if (!i915_gem_request_completed(request, true))
+		if (!i915_gem_request_completed(request))
 			break;
 
 		i915_gem_request_retire(request);
@@ -2932,7 +2940,7 @@ i915_gem_retire_requests_ring(struct intel_engine_cs *engine)
 	}
 
 	if (unlikely(engine->trace_irq_req &&
-		     i915_gem_request_completed(engine->trace_irq_req, true))) {
+		     i915_gem_request_completed(engine->trace_irq_req))) {
 		engine->irq_put(engine);
 		i915_gem_request_assign(&engine->trace_irq_req, NULL);
 	}
@@ -3029,7 +3037,7 @@ i915_gem_object_flush_active(struct drm_i915_gem_object *obj)
 		if (req == NULL)
 			continue;
 
-		if (i915_gem_request_completed(req, true))
+		if (i915_gem_request_completed(req))
 			i915_gem_object_retire__read(obj, i);
 	}
 
@@ -3135,7 +3143,7 @@ __i915_gem_object_sync(struct drm_i915_gem_object *obj,
 	if (to == from)
 		return 0;
 
-	if (i915_gem_request_completed(from_req, true))
+	if (i915_gem_request_completed(from_req))
 		return 0;
 
 	if (!i915_semaphore_is_enabled(to_i915(obj->base.dev))) {
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 94d28c795e22..4f90920b10a7 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11449,7 +11449,7 @@ static bool __intel_pageflip_stall_check(struct drm_device *dev,
 
 	if (work->flip_ready_vblank == 0) {
 		if (work->flip_queued_req &&
-		    !i915_gem_request_completed(work->flip_queued_req, true))
+		    !i915_gem_request_completed(work->flip_queued_req))
 			return false;
 
 		work->flip_ready_vblank = drm_crtc_vblank_count(crtc);
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index adb64638f595..abb6ab84ad3c 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -7531,7 +7531,7 @@ static void __intel_rps_boost_work(struct work_struct *work)
 	struct request_boost *boost = container_of(work, struct request_boost, work);
 	struct drm_i915_gem_request *req = boost->req;
 
-	if (!i915_gem_request_completed(req, true))
+	if (!i915_gem_request_completed(req))
 		gen6_rps_boost(req->i915, NULL, req->emitted_jiffies);
 
 	i915_gem_request_unreference(req);
@@ -7545,7 +7545,7 @@ void intel_queue_rps_boost_for_request(struct drm_i915_gem_request *req)
 	if (req == NULL || INTEL_GEN(req->i915) < 6)
 		return;
 
-	if (i915_gem_request_completed(req, true))
+	if (i915_gem_request_completed(req))
 		return;
 
 	boost = kmalloc(sizeof(*boost), GFP_ATOMIC);
-- 
2.8.1

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