[PATCH 46/81] drm/i915: Disable waitboosting for mmioflips/semaphores

[Chris Wilson]

Since

commit a6f766f3975185af66a31a2cea2cd38721645999
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon Apr 27 13:41:20 2015 +0100

    drm/i915: Limit ring synchronisation (sw sempahores) RPS boosts

and

commit bcafc4e38b6ad03f48989b7ecaff03845b5b7acf
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon Apr 27 13:41:21 2015 +0100

    drm/i915: Limit mmio flip RPS boosts

we have limited the waitboosting for semaphores and flips. Ideally we do
not want to boost in either of these instances as no consumer is waiting
upon the results. With the introduction of NO_WAITBOOST in the previous
patch, we can finally disable these needless boosts.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_debugfs.c  | 8 +-------
 drivers/gpu/drm/i915/i915_drv.h      | 2 --
 drivers/gpu/drm/i915/i915_gem.c      | 2 +-
 drivers/gpu/drm/i915/intel_display.c | 2 +-
 drivers/gpu/drm/i915/intel_pm.c      | 2 --
 5 files changed, 3 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 0e7bf67c70da..617cd9724384 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2430,13 +2430,7 @@ static int i915_rps_boost_info(struct seq_file *m, void *data)
 			   list_empty(&file_priv->rps.link) ? "" : ", active");
 		rcu_read_unlock();
 	}
-	seq_printf(m, "Semaphore boosts: %d%s\n",
-		   dev_priv->rps.semaphores.boosts,
-		   list_empty(&dev_priv->rps.semaphores.link) ? "" : ", active");
-	seq_printf(m, "MMIO flip boosts: %d%s\n",
-		   dev_priv->rps.mmioflips.boosts,
-		   list_empty(&dev_priv->rps.mmioflips.link) ? "" : ", active");
-	seq_printf(m, "Kernel boosts: %d\n", dev_priv->rps.boosts);
+	seq_printf(m, "Kernel (anonymous) boosts: %d\n", dev_priv->rps.boosts);
 	spin_unlock(&dev_priv->rps.client_lock);
 
 	return 0;
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 5ea3759a4134..24441e2daac9 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1155,8 +1155,6 @@ struct intel_gen6_power_mgmt {
 	struct delayed_work delayed_resume_work;
 	unsigned boosts;
 
-	struct intel_rps_client semaphores, mmioflips;
-
 	/* manual wa residency calculations */
 	struct intel_rps_ei up_ei, down_ei;
 
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 1384849a541b..8570813eafdd 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2575,7 +2575,7 @@ __i915_gem_object_sync(struct drm_i915_gem_object *obj,
 		ret = __i915_wait_request(from_req,
 					  i915->mm.interruptible,
 					  NULL,
-					  &i915->rps.semaphores);
+					  NO_WAITBOOST);
 		if (ret)
 			return ret;
 
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index ce6274fb308b..83b34b99b951 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11369,7 +11369,7 @@ static void intel_mmio_flip_work_func(struct work_struct *work)
 	if (mmio_flip->req) {
 		WARN_ON(__i915_wait_request(mmio_flip->req,
 					    false, NULL,
-					    &mmio_flip->i915->rps.mmioflips));
+					    NO_WAITBOOST));
 		i915_gem_request_put(mmio_flip->req);
 	}
 
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 3cdc68a924b2..2254949ed10c 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -7399,8 +7399,6 @@ void intel_pm_setup(struct drm_device *dev)
 	INIT_DELAYED_WORK(&dev_priv->rps.delayed_resume_work,
 			  intel_gen6_powersave_work);
 	INIT_LIST_HEAD(&dev_priv->rps.clients);
-	INIT_LIST_HEAD(&dev_priv->rps.semaphores.link);
-	INIT_LIST_HEAD(&dev_priv->rps.mmioflips.link);
 
 	dev_priv->pm.suspended = false;
 	atomic_set(&dev_priv->pm.wakeref_count, 0);
-- 
2.8.0.rc3