[PATCH 7/9] drm/i915: Disable waitboosting for mmioflips/semaphores

Chris Wilson
2016-07-15T10:11:50Z

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@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 55fd3d9cc448..618f8cf210fc 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2465,13 +2465,7 @@ 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 a4767c198413..08d9c081e9c8 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1195,8 +1195,6 @@ struct intel_gen6_power_mgmt {
struct delayed_work autoenable_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 40cc3da68611..2ec78aa7279e 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2849,7 +2849,7 @@ __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 9337d3a7b83d..813c9c3b32ca 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11473,7 +11473,7 @@ 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 fa6b341c2792..a1bf5f8fbb1c 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -7810,8 +7810,6 @@ void intel_pm_setup(struct drm_device *dev)
INIT_DELAYED_WORK(&dev_priv->rps.autoenable_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