[PATCH 30/74] drm/i915: Disable waitboosting for mmioflips/semaphores

[Chris Wilson]

Since commit a6f766f39751 ("drm/i915: Limit ring synchronisation (sw
sempahores) RPS boosts") and commit bcafc4e38b6a ("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 1512c4697cf9..9eee27d547e7 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2463,13 +2463,7 @@ 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 0e0af6fc518a..69fa25af072f 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1185,8 +1185,6 @@ 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 15547b4174e6..228007ac016d 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2825,7 +2825,7 @@ __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 514c7ea28d78..4a70bd52067c 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11559,7 +11559,7 @@ static void intel_mmio_flip_work_func(struct work_struct *w)
 	if (work->flip_queued_req)
 		WARN_ON(__i915_wait_request(work->flip_queued_req,
 					    false, NULL,
-					    &dev_priv->rps.mmioflips));
+					    NO_WAITBOOST));
 
 	/* For framebuffer backed by dmabuf, wait for fence */
 	resv = i915_gem_object_get_dmabuf_resv(obj);
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 504f45d7ea51..235f1a371d90 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -7835,8 +7835,6 @@ void intel_pm_setup(struct drm_device *dev)
 	INIT_DELAYED_WORK(&dev_priv->rps.delayed_resume_work,
 			  __intel_autoenable_gt_powersave);
 	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