drm/i915: Remove pm park/unpark notifications

With the last user, i915_vma_parked(), retired, there are no more users
of the per-gt pm notifications and we can remove the unused
infrastructure.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191021183236.21790-2-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/gem/i915_gem_pm.c

@@ -11,24 +11,6 @@
 
 #include "i915_drv.h"
 
-static int pm_notifier(struct notifier_block *nb,
-		       unsigned long action,
-		       void *data)
-{
-	struct drm_i915_private *i915 =
-		container_of(nb, typeof(*i915), gem.pm_notifier);
-
-	switch (action) {
-	case INTEL_GT_UNPARK:
-		break;
-
-	case INTEL_GT_PARK:
-		break;
-	}
-
-	return NOTIFY_OK;
-}
-
 static bool switch_to_kernel_context_sync(struct intel_gt *gt)
 {
 	bool result = !intel_gt_is_wedged(gt);
@@ -206,10 +188,3 @@ void i915_gem_resume(struct drm_i915_private *i915)
 	}
 	goto out_unlock;
 }
-
-void i915_gem_init__pm(struct drm_i915_private *i915)
-{
-	i915->gem.pm_notifier.notifier_call = pm_notifier;
-	blocking_notifier_chain_register(&i915->gt.pm_notifications,
-					 &i915->gem.pm_notifier);
-}

drivers/gpu/drm/i915/gem/i915_gem_pm.h

@@ -12,8 +12,6 @@
 struct drm_i915_private;
 struct work_struct;
 
-void i915_gem_init__pm(struct drm_i915_private *i915);
-
 bool i915_gem_load_power_context(struct drm_i915_private *i915);
 void i915_gem_resume(struct drm_i915_private *i915);
 

drivers/gpu/drm/i915/gt/intel_gt_pm.c

@@ -16,11 +16,6 @@
 #include "intel_rc6.h"
 #include "intel_wakeref.h"
 
-static void pm_notify(struct intel_gt *gt, int state)
-{
-	blocking_notifier_call_chain(&gt->pm_notifications, state, gt->i915);
-}
-
 static int __gt_unpark(struct intel_wakeref *wf)
 {
 	struct intel_gt *gt = container_of(wf, typeof(*gt), wakeref);
@@ -55,8 +50,6 @@ static int __gt_unpark(struct intel_wakeref *wf)
 	intel_gt_queue_hangcheck(gt);
 	intel_gt_unpark_requests(gt);
 
-	pm_notify(gt, INTEL_GT_UNPARK);
-
 	return 0;
 }
 
@@ -68,7 +61,6 @@ static int __gt_park(struct intel_wakeref *wf)
 
 	GEM_TRACE("\n");
 
-	pm_notify(gt, INTEL_GT_PARK);
 	intel_gt_park_requests(gt);
 
 	i915_vma_parked(gt);
@@ -96,8 +88,6 @@ static const struct intel_wakeref_ops wf_ops = {
 void intel_gt_pm_init_early(struct intel_gt *gt)
 {
 	intel_wakeref_init(&gt->wakeref, gt->uncore->rpm, &wf_ops);
-
-	BLOCKING_INIT_NOTIFIER_HEAD(&gt->pm_notifications);
 }
 
 void intel_gt_pm_init(struct intel_gt *gt)

drivers/gpu/drm/i915/gt/intel_gt_pm.h

@@ -12,11 +12,6 @@
 #include "intel_gt_types.h"
 #include "intel_wakeref.h"
 
-enum {
-	INTEL_GT_UNPARK,
-	INTEL_GT_PARK,
-};
-
 static inline bool intel_gt_pm_is_awake(const struct intel_gt *gt)
 {
 	return intel_wakeref_is_active(&gt->wakeref);

drivers/gpu/drm/i915/gt/intel_gt_types.h

@@ -83,8 +83,6 @@ struct intel_gt {
 	struct intel_llc llc;
 	struct intel_rc6 rc6;
 
-	struct blocking_notifier_head pm_notifications;
-
 	ktime_t last_init_time;
 
 	struct i915_vma *scratch;

drivers/gpu/drm/i915/i915_gem.c

@@ -1432,7 +1432,6 @@ static void i915_gem_init__mm(struct drm_i915_private *i915)
 void i915_gem_init_early(struct drm_i915_private *dev_priv)
 {
 	i915_gem_init__mm(dev_priv);
-	i915_gem_init__pm(dev_priv);
 
 	spin_lock_init(&dev_priv->fb_tracking.lock);
 }