Re: [RFC 1/4] drm/i915/pmu: Make more struct i915_pmu centric

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On Thu, 01 Aug 2019 12:18:22 +0200, Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx> wrote: 


From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>

Just tidy the code a bit by removing a sea of overly verbose i915->pmu.*.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
 drivers/gpu/drm/i915/i915_pmu.c | 194 +++++++++++++++++---------------
 1 file changed, 104 insertions(+), 90 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c 
index eff86483bec0..12008966b00e 100644
--- a/drivers/gpu/drm/i915/i915_pmu.c
+++ b/drivers/gpu/drm/i915/i915_pmu.c
@@ -74,8 +74,9 @@ static unsigned int event_enabled_bit(struct perf_event *event) 
 	return config_enabled_bit(event->attr.config);
 }
-static bool pmu_needs_timer(struct drm_i915_private *i915, bool gpu_active) 
+static bool pmu_needs_timer(struct i915_pmu *pmu, bool gpu_active)
 {
+	struct drm_i915_private *i915 = container_of(pmu, typeof(*i915), pmu);


maybe this can be promoted to pmu_to_i915() ?


 	u64 enable;
	/*
@@ -83,7 +84,7 @@ static bool pmu_needs_timer(struct drm_i915_private *i915, bool gpu_active) 
 	 *
 	 * We start with a bitmask of all currently enabled events.
 	 */
-	enable = i915->pmu.enable;
+	enable = pmu->enable;
	/*
 	 * Mask out all the ones which do not need the timer, or in
@@ -114,24 +115,26 @@ static bool pmu_needs_timer(struct drm_i915_private *i915, bool gpu_active) 
void i915_pmu_gt_parked(struct drm_i915_private *i915)


you should be more consistent and change this one too


 {
-	if (!i915->pmu.base.event_init)
+	struct i915_pmu *pmu = &i915->pmu;
+
+	if (!pmu->base.event_init)
 		return;
-	spin_lock_irq(&i915->pmu.lock);
+	spin_lock_irq(&pmu->lock);
 	/*
 	 * Signal sampling timer to stop if only engine events are enabled and
 	 * GPU went idle.
 	 */
-	i915->pmu.timer_enabled = pmu_needs_timer(i915, false);
-	spin_unlock_irq(&i915->pmu.lock);
+	pmu->timer_enabled = pmu_needs_timer(pmu, false);
+	spin_unlock_irq(&pmu->lock);
 }
-static void __i915_pmu_maybe_start_timer(struct drm_i915_private *i915)
+static void __i915_pmu_maybe_start_timer(struct i915_pmu *pmu)
 {
-	if (!i915->pmu.timer_enabled && pmu_needs_timer(i915, true)) {
-		i915->pmu.timer_enabled = true;
-		i915->pmu.timer_last = ktime_get();
-		hrtimer_start_range_ns(&i915->pmu.timer,
+	if (!pmu->timer_enabled && pmu_needs_timer(pmu, true)) {
+		pmu->timer_enabled = true;
+		pmu->timer_last = ktime_get();
+		hrtimer_start_range_ns(&pmu->timer,
 				       ns_to_ktime(PERIOD), 0,
 				       HRTIMER_MODE_REL_PINNED);
 	}
@@ -139,15 +142,17 @@ static void __i915_pmu_maybe_start_timer(struct drm_i915_private *i915) 
void i915_pmu_gt_unparked(struct drm_i915_private *i915)


and here (and even some more in whole .c file)


 {
-	if (!i915->pmu.base.event_init)
+	struct i915_pmu *pmu = &i915->pmu;
+
+	if (!pmu->base.event_init)
 		return;
-	spin_lock_irq(&i915->pmu.lock);
+	spin_lock_irq(&pmu->lock);
 	/*
 	 * Re-enable sampling timer when GPU goes active.
 	 */
-	__i915_pmu_maybe_start_timer(i915);
-	spin_unlock_irq(&i915->pmu.lock);
+	__i915_pmu_maybe_start_timer(pmu);
+	spin_unlock_irq(&pmu->lock);
 }
static void
@@ -251,15 +256,16 @@ static enum hrtimer_restart i915_sample(struct hrtimer *hrtimer) 
 {
 	struct drm_i915_private *i915 =
 		container_of(hrtimer, struct drm_i915_private, pmu.timer);
+	struct i915_pmu *pmu = &i915->pmu;
 	unsigned int period_ns;
 	ktime_t now;
-	if (!READ_ONCE(i915->pmu.timer_enabled))
+	if (!READ_ONCE(pmu->timer_enabled))
 		return HRTIMER_NORESTART;
	now = ktime_get();
-	period_ns = ktime_to_ns(ktime_sub(now, i915->pmu.timer_last));
-	i915->pmu.timer_last = now;
+	period_ns = ktime_to_ns(ktime_sub(now, pmu->timer_last));
+	pmu->timer_last = now;
	/*
 	 * Strictly speaking the passed in period may not be 100% accurate for
@@ -443,6 +449,7 @@ static u64 get_rc6(struct drm_i915_private *i915)


this can also take *pmu instead of *i915


 {
 #if IS_ENABLED(CONFIG_PM)
 	struct intel_runtime_pm *rpm = &i915->runtime_pm;
+	struct i915_pmu *pmu = &i915->pmu;
 	intel_wakeref_t wakeref;
 	unsigned long flags;
 	u64 val;
@@ -458,16 +465,16 @@ static u64 get_rc6(struct drm_i915_private *i915)
 		 * previously.
 		 */
-		spin_lock_irqsave(&i915->pmu.lock, flags);
+		spin_lock_irqsave(&pmu->lock, flags);
-		if (val >= i915->pmu.sample[__I915_SAMPLE_RC6_ESTIMATED].cur) {
-			i915->pmu.sample[__I915_SAMPLE_RC6_ESTIMATED].cur = 0;
-			i915->pmu.sample[__I915_SAMPLE_RC6].cur = val;
+		if (val >= pmu->sample[__I915_SAMPLE_RC6_ESTIMATED].cur) {
+			pmu->sample[__I915_SAMPLE_RC6_ESTIMATED].cur = 0;
+			pmu->sample[__I915_SAMPLE_RC6].cur = val;
 		} else {
-			val = i915->pmu.sample[__I915_SAMPLE_RC6_ESTIMATED].cur;
+			val = pmu->sample[__I915_SAMPLE_RC6_ESTIMATED].cur;
 		}
-		spin_unlock_irqrestore(&i915->pmu.lock, flags);
+		spin_unlock_irqrestore(&pmu->lock, flags);
 	} else {
 		struct device *kdev = rpm->kdev;
@@ -478,7 +485,7 @@ static u64 get_rc6(struct drm_i915_private *i915)
 		 * on top of the last known real value, as the approximated RC6
 		 * counter value.
 		 */
-		spin_lock_irqsave(&i915->pmu.lock, flags);
+		spin_lock_irqsave(&pmu->lock, flags);
		/*
 		 * After the above branch intel_runtime_pm_get_if_in_use failed
@@ -494,20 +501,20 @@ static u64 get_rc6(struct drm_i915_private *i915)
 		if (pm_runtime_status_suspended(kdev)) {
 			val = pm_runtime_suspended_time(kdev);
-			if (!i915->pmu.sample[__I915_SAMPLE_RC6_ESTIMATED].cur)
-				i915->pmu.suspended_time_last = val;
+			if (!pmu->sample[__I915_SAMPLE_RC6_ESTIMATED].cur)
+				pmu->suspended_time_last = val;
-			val -= i915->pmu.suspended_time_last;
-			val += i915->pmu.sample[__I915_SAMPLE_RC6].cur;
+			val -= pmu->suspended_time_last;
+			val += pmu->sample[__I915_SAMPLE_RC6].cur;
-			i915->pmu.sample[__I915_SAMPLE_RC6_ESTIMATED].cur = val;
-		} else if (i915->pmu.sample[__I915_SAMPLE_RC6_ESTIMATED].cur) {
-			val = i915->pmu.sample[__I915_SAMPLE_RC6_ESTIMATED].cur;
+			pmu->sample[__I915_SAMPLE_RC6_ESTIMATED].cur = val;
+		} else if (pmu->sample[__I915_SAMPLE_RC6_ESTIMATED].cur) {
+			val = pmu->sample[__I915_SAMPLE_RC6_ESTIMATED].cur;
 		} else {
-			val = i915->pmu.sample[__I915_SAMPLE_RC6].cur;
+			val = pmu->sample[__I915_SAMPLE_RC6].cur;
 		}
-		spin_unlock_irqrestore(&i915->pmu.lock, flags);
+		spin_unlock_irqrestore(&pmu->lock, flags);
 	}
	return val;
@@ -520,6 +527,7 @@ static u64 __i915_pmu_event_read(struct perf_event *event) 
 {
 	struct drm_i915_private *i915 =
 		container_of(event->pmu, typeof(*i915), pmu.base);
+	struct i915_pmu *pmu = &i915->pmu;
 	u64 val = 0;
	if (is_engine_event(event)) {
@@ -542,12 +550,12 @@ static u64 __i915_pmu_event_read(struct perf_event *event) 
 		switch (event->attr.config) {
 		case I915_PMU_ACTUAL_FREQUENCY:
 			val =
-			   div_u64(i915->pmu.sample[__I915_SAMPLE_FREQ_ACT].cur,
+			   div_u64(pmu->sample[__I915_SAMPLE_FREQ_ACT].cur,
 				   USEC_PER_SEC /* to MHz */);
 			break;
 		case I915_PMU_REQUESTED_FREQUENCY:
 			val =
-			   div_u64(i915->pmu.sample[__I915_SAMPLE_FREQ_REQ].cur,
+			   div_u64(pmu->sample[__I915_SAMPLE_FREQ_REQ].cur,
 				   USEC_PER_SEC /* to MHz */);
 			break;
 		case I915_PMU_INTERRUPTS:
@@ -582,24 +590,25 @@ static void i915_pmu_enable(struct perf_event *event) 
 	struct drm_i915_private *i915 =
 		container_of(event->pmu, typeof(*i915), pmu.base);
 	unsigned int bit = event_enabled_bit(event);
+	struct i915_pmu *pmu = &i915->pmu;
 	unsigned long flags;
-	spin_lock_irqsave(&i915->pmu.lock, flags);
+	spin_lock_irqsave(&pmu->lock, flags);
	/*
 	 * Update the bitmask of enabled events and increment
 	 * the event reference counter.
 	 */
-	BUILD_BUG_ON(ARRAY_SIZE(i915->pmu.enable_count) != I915_PMU_MASK_BITS);
-	GEM_BUG_ON(bit >= ARRAY_SIZE(i915->pmu.enable_count));
-	GEM_BUG_ON(i915->pmu.enable_count[bit] == ~0);
-	i915->pmu.enable |= BIT_ULL(bit);
-	i915->pmu.enable_count[bit]++;
+	BUILD_BUG_ON(ARRAY_SIZE(pmu->enable_count) != I915_PMU_MASK_BITS);
+	GEM_BUG_ON(bit >= ARRAY_SIZE(pmu->enable_count));
+	GEM_BUG_ON(pmu->enable_count[bit] == ~0);
+	pmu->enable |= BIT_ULL(bit);
+	pmu->enable_count[bit]++;
	/*
 	 * Start the sampling timer if needed and not already enabled.
 	 */
-	__i915_pmu_maybe_start_timer(i915);
+	__i915_pmu_maybe_start_timer(pmu);
	/*
 	 * For per-engine events the bitmask and reference counting
@@ -625,7 +634,7 @@ static void i915_pmu_enable(struct perf_event *event)
 		engine->pmu.enable_count[sample]++;
 	}
-	spin_unlock_irqrestore(&i915->pmu.lock, flags);
+	spin_unlock_irqrestore(&pmu->lock, flags);
	/*
 	 * Store the current counter value so we can report the correct delta
@@ -640,9 +649,10 @@ static void i915_pmu_disable(struct perf_event *event) 
 	struct drm_i915_private *i915 =
 		container_of(event->pmu, typeof(*i915), pmu.base);
 	unsigned int bit = event_enabled_bit(event);
+	struct i915_pmu *pmu = &i915->pmu;
 	unsigned long flags;
-	spin_lock_irqsave(&i915->pmu.lock, flags);
+	spin_lock_irqsave(&pmu->lock, flags);
	if (is_engine_event(event)) {
 		u8 sample = engine_event_sample(event);
@@ -664,18 +674,18 @@ static void i915_pmu_disable(struct perf_event *event) 
 			engine->pmu.enable &= ~BIT(sample);
 	}
-	GEM_BUG_ON(bit >= ARRAY_SIZE(i915->pmu.enable_count));
-	GEM_BUG_ON(i915->pmu.enable_count[bit] == 0);
+	GEM_BUG_ON(bit >= ARRAY_SIZE(pmu->enable_count));
+	GEM_BUG_ON(pmu->enable_count[bit] == 0);
 	/*
 	 * Decrement the reference count and clear the enabled
 	 * bitmask when the last listener on an event goes away.
 	 */
-	if (--i915->pmu.enable_count[bit] == 0) {
-		i915->pmu.enable &= ~BIT_ULL(bit);
-		i915->pmu.timer_enabled &= pmu_needs_timer(i915, true);
+	if (--pmu->enable_count[bit] == 0) {
+		pmu->enable &= ~BIT_ULL(bit);
+		pmu->timer_enabled &= pmu_needs_timer(pmu, true);
 	}
-	spin_unlock_irqrestore(&i915->pmu.lock, flags);
+	spin_unlock_irqrestore(&pmu->lock, flags);
 }
static void i915_pmu_event_start(struct perf_event *event, int flags)
@@ -824,8 +834,9 @@ add_pmu_attr(struct perf_pmu_events_attr *attr, const char *name, 
 }
static struct attribute **
-create_event_attributes(struct drm_i915_private *i915)
+create_event_attributes(struct i915_pmu *pmu)
 {
+	struct drm_i915_private *i915 = container_of(pmu, typeof(*i915), pmu);
 	static const struct {
 		u64 config;
 		const char *name;
@@ -939,8 +950,8 @@ create_event_attributes(struct drm_i915_private *i915) 
 		}
 	}
-	i915->pmu.i915_attr = i915_attr;
-	i915->pmu.pmu_attr = pmu_attr;
+	pmu->i915_attr = i915_attr;
+	pmu->pmu_attr = pmu_attr;
	return attr;
@@ -956,7 +967,7 @@ err:;
 	return NULL;
 }
-static void free_event_attributes(struct drm_i915_private *i915)
+static void free_event_attributes(struct i915_pmu *pmu)
 {
 	struct attribute **attr_iter = i915_pmu_events_attr_group.attrs;
@@ -964,12 +975,12 @@ static void free_event_attributes(struct drm_i915_private *i915) 
 		kfree((*attr_iter)->name);
	kfree(i915_pmu_events_attr_group.attrs);
-	kfree(i915->pmu.i915_attr);
-	kfree(i915->pmu.pmu_attr);
+	kfree(pmu->i915_attr);
+	kfree(pmu->pmu_attr);
	i915_pmu_events_attr_group.attrs = NULL;
-	i915->pmu.i915_attr = NULL;
-	i915->pmu.pmu_attr = NULL;
+	pmu->i915_attr = NULL;
+	pmu->pmu_attr = NULL;
 }
static int i915_pmu_cpu_online(unsigned int cpu, struct hlist_node *node)
@@ -1006,7 +1017,7 @@ static int i915_pmu_cpu_offline(unsigned int cpu, struct hlist_node *node) 
static enum cpuhp_state cpuhp_slot = CPUHP_INVALID;
-static int i915_pmu_register_cpuhp_state(struct drm_i915_private *i915)
+static int i915_pmu_register_cpuhp_state(struct i915_pmu *pmu)
 {
 	enum cpuhp_state slot;
 	int ret;
@@ -1019,7 +1030,7 @@ static int i915_pmu_register_cpuhp_state(struct drm_i915_private *i915) 
 		return ret;
	slot = ret;
-	ret = cpuhp_state_add_instance(slot, &i915->pmu.node);
+	ret = cpuhp_state_add_instance(slot, &pmu->node);
 	if (ret) {
 		cpuhp_remove_multi_state(slot);
 		return ret;
@@ -1029,15 +1040,16 @@ static int i915_pmu_register_cpuhp_state(struct drm_i915_private *i915) 
 	return 0;
 }
-static void i915_pmu_unregister_cpuhp_state(struct drm_i915_private *i915) 
+static void i915_pmu_unregister_cpuhp_state(struct i915_pmu *pmu)
 {
 	WARN_ON(cpuhp_slot == CPUHP_INVALID);
-	WARN_ON(cpuhp_state_remove_instance(cpuhp_slot, &i915->pmu.node));
+	WARN_ON(cpuhp_state_remove_instance(cpuhp_slot, &pmu->node));
 	cpuhp_remove_multi_state(cpuhp_slot);
 }
void i915_pmu_register(struct drm_i915_private *i915)


again


 {
+	struct i915_pmu *pmu = &i915->pmu;
 	int ret;
	if (INTEL_GEN(i915) <= 2) {
@@ -1045,56 +1057,58 @@ void i915_pmu_register(struct drm_i915_private *i915) 
 		return;
 	}
-	i915_pmu_events_attr_group.attrs = create_event_attributes(i915);
+	i915_pmu_events_attr_group.attrs = create_event_attributes(pmu);
 	if (!i915_pmu_events_attr_group.attrs) {
 		ret = -ENOMEM;
 		goto err;
 	}
-	i915->pmu.base.attr_groups	= i915_pmu_attr_groups;
-	i915->pmu.base.task_ctx_nr	= perf_invalid_context;
-	i915->pmu.base.event_init	= i915_pmu_event_init;
-	i915->pmu.base.add		= i915_pmu_event_add;
-	i915->pmu.base.del		= i915_pmu_event_del;
-	i915->pmu.base.start		= i915_pmu_event_start;
-	i915->pmu.base.stop		= i915_pmu_event_stop;
-	i915->pmu.base.read		= i915_pmu_event_read;
-	i915->pmu.base.event_idx	= i915_pmu_event_event_idx;
-
-	spin_lock_init(&i915->pmu.lock);
-	hrtimer_init(&i915->pmu.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
-	i915->pmu.timer.function = i915_sample;
-
-	ret = perf_pmu_register(&i915->pmu.base, "i915", -1);
+	pmu->base.attr_groups	= i915_pmu_attr_groups;
+	pmu->base.task_ctx_nr	= perf_invalid_context;
+	pmu->base.event_init	= i915_pmu_event_init;
+	pmu->base.add		= i915_pmu_event_add;
+	pmu->base.del		= i915_pmu_event_del;
+	pmu->base.start		= i915_pmu_event_start;
+	pmu->base.stop		= i915_pmu_event_stop;
+	pmu->base.read		= i915_pmu_event_read;
+	pmu->base.event_idx	= i915_pmu_event_event_idx;
+
+	spin_lock_init(&pmu->lock);
+	hrtimer_init(&pmu->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+	pmu->timer.function = i915_sample;
+
+	ret = perf_pmu_register(&pmu->base, "i915", -1);
 	if (ret)
 		goto err;
-	ret = i915_pmu_register_cpuhp_state(i915);
+	ret = i915_pmu_register_cpuhp_state(pmu);
 	if (ret)
 		goto err_unreg;
	return;
err_unreg:
-	perf_pmu_unregister(&i915->pmu.base);
+	perf_pmu_unregister(&pmu->base);
 err:
-	i915->pmu.base.event_init = NULL;
-	free_event_attributes(i915);
+	pmu->base.event_init = NULL;
+	free_event_attributes(pmu);
 	DRM_NOTE("Failed to register PMU! (err=%d)\n", ret);
 }
void i915_pmu_unregister(struct drm_i915_private *i915)


and again


 {
-	if (!i915->pmu.base.event_init)
+	struct i915_pmu *pmu = &i915->pmu;
+
+	if (!pmu->base.event_init)
 		return;
-	WARN_ON(i915->pmu.enable);
+	WARN_ON(pmu->enable);
-	hrtimer_cancel(&i915->pmu.timer);
+	hrtimer_cancel(&pmu->timer);
-	i915_pmu_unregister_cpuhp_state(i915);
+	i915_pmu_unregister_cpuhp_state(pmu);
-	perf_pmu_unregister(&i915->pmu.base);
-	i915->pmu.base.event_init = NULL;
-	free_event_attributes(i915);
+	perf_pmu_unregister(&pmu->base);
+	pmu->base.event_init = NULL;
+	free_event_attributes(pmu);
 }


with all possible replacements,

Reviewed-by: Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx>
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