linux-kernel - [PATCH v5 2/3] drm/i915: Move on the new pm runtime interface

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Message-Id: <1545388436-7489-3-git-send-email-vincent.guittot@linaro.org>
Date:   Fri, 21 Dec 2018 11:33:55 +0100
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        rjw@...ysocki.net, thara.gopinath@...aro.org,
        jani.nikula@...ux.intel.com, joonas.lahtinen@...ux.intel.com,
        rodrigo.vivi@...el.com, airlied@...ux.ie,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Cc:     ulf.hansson@...aro.org,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: [PATCH v5 2/3] drm/i915: Move on the new pm runtime interface

Use the new pm runtime interface to get the accounted suspended time:
pm_runtime_suspended_time().
This new interface helps to simplify and cleanup the code that computes
__I915_SAMPLE_RC6_ESTIMATED and to remove direct access to internals of
PM runtime.

Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
---
 drivers/gpu/drm/i915/i915_pmu.c | 16 ++++++----------
 drivers/gpu/drm/i915/i915_pmu.h |  4 ++--
 2 files changed, 8 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
index d6c8f8f..3f76f60 100644
--- a/drivers/gpu/drm/i915/i915_pmu.c
+++ b/drivers/gpu/drm/i915/i915_pmu.c
@@ -5,6 +5,7 @@
  */
 
 #include <linux/irq.h>
+#include <linux/pm_runtime.h>
 #include "i915_pmu.h"
 #include "intel_ringbuffer.h"
 #include "i915_drv.h"
@@ -478,7 +479,6 @@ static u64 get_rc6(struct drm_i915_private *i915)
 		 * counter value.
 		 */
 		spin_lock_irqsave(&i915->pmu.lock, flags);
-		spin_lock(&kdev->power.lock);
 
 		/*
 		 * After the above branch intel_runtime_pm_get_if_in_use failed
@@ -491,16 +491,13 @@ static u64 get_rc6(struct drm_i915_private *i915)
 		 * suspended and if not we cannot do better than report the last
 		 * known RC6 value.
 		 */
-		if (kdev->power.runtime_status == RPM_SUSPENDED) {
-			if (!i915->pmu.sample[__I915_SAMPLE_RC6_ESTIMATED].cur)
-				i915->pmu.suspended_jiffies_last =
-						  kdev->power.suspended_jiffies;
+		if (pm_runtime_status_suspended(kdev)) {
+			val = pm_runtime_suspended_time(kdev);
 
-			val = kdev->power.suspended_jiffies -
-			      i915->pmu.suspended_jiffies_last;
-			val += jiffies - kdev->power.accounting_timestamp;
+			if (!i915->pmu.sample[__I915_SAMPLE_RC6_ESTIMATED].cur)
+				i915->pmu.suspended_time_last = val;
 
-			val = jiffies_to_nsecs(val);
+			val -= i915->pmu.suspended_time_last;
 			val += i915->pmu.sample[__I915_SAMPLE_RC6].cur;
 
 			i915->pmu.sample[__I915_SAMPLE_RC6_ESTIMATED].cur = val;
@@ -510,7 +507,6 @@ static u64 get_rc6(struct drm_i915_private *i915)
 			val = i915->pmu.sample[__I915_SAMPLE_RC6].cur;
 		}
 
-		spin_unlock(&kdev->power.lock);
 		spin_unlock_irqrestore(&i915->pmu.lock, flags);
 	}
 
diff --git a/drivers/gpu/drm/i915/i915_pmu.h b/drivers/gpu/drm/i915/i915_pmu.h
index 7f164ca..3dc2a30 100644
--- a/drivers/gpu/drm/i915/i915_pmu.h
+++ b/drivers/gpu/drm/i915/i915_pmu.h
@@ -95,9 +95,9 @@ struct i915_pmu {
 	 */
 	struct i915_pmu_sample sample[__I915_NUM_PMU_SAMPLERS];
 	/**
-	 * @suspended_jiffies_last: Cached suspend time from PM core.
+	 * @suspended_time_last: Cached suspend time from PM core.
 	 */
-	unsigned long suspended_jiffies_last;
+	u64 suspended_time_last;
 	/**
 	 * @i915_attr: Memory block holding device attributes.
 	 */
-- 
2.7.4