[PATCH 39/78] 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 6ede748b4493..ade74341b3dc 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2435,13 +2435,7 @@ 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);
 	mutex_unlock(&dev->filelist_mutex);
 
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 5fd124530257..78dd57769993 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1157,8 +1157,6 @@ 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 8163b0b84632..c50472e82585 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2557,7 +2557,7 @@ __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 b630595291a2..be90599a0492 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11362,7 +11362,7 @@ 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 884c542f1383..4d401922f442 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -7441,8 +7441,6 @@ 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);
-- 
2.8.1