linux/debian/patches/patchset-pf/amd-rapl/0006-perf-x86-rapl-Rename-rapl_pmu-variables.patch

From 30e2cd787aeb9cb9c1148e07446aac76765f715e Mon Sep 17 00:00:00 2001
From: Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com>
Date: Fri, 15 Nov 2024 06:08:00 +0000
Subject: perf/x86/rapl: Rename rapl_pmu variables

Rename struct rapl_pmu variables from "pmu" to "rapl_pmu", to
avoid any confusion between the variables of two different
structs pmu and rapl_pmu. As rapl_pmu also contains a pointer to
struct pmu, which leads to situations in code like pmu->pmu,
which is needlessly confusing. Above scenario is replaced with
much more readable rapl_pmu->pmu with this change.

Also rename "pmus" member in rapl_pmus struct, for same reason.

No functional change.

Signed-off-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Reviewed-by: Zhang Rui <rui.zhang@intel.com>
Tested-by: Zhang Rui <rui.zhang@intel.com>
---
 arch/x86/events/rapl.c | 91 +++++++++++++++++++++---------------------
 1 file changed, 46 insertions(+), 45 deletions(-)

--- a/arch/x86/events/rapl.c
+++ b/arch/x86/events/rapl.c
@@ -129,7 +129,7 @@ struct rapl_pmu {
 struct rapl_pmus {
 	struct pmu		pmu;
 	unsigned int		nr_rapl_pmu;
-	struct rapl_pmu		*pmus[] __counted_by(nr_rapl_pmu);
+	struct rapl_pmu		*rapl_pmu[] __counted_by(nr_rapl_pmu);
 };
 
 enum rapl_unit_quirk {
@@ -227,34 +227,34 @@ static void rapl_start_hrtimer(struct ra
 
 static enum hrtimer_restart rapl_hrtimer_handle(struct hrtimer *hrtimer)
 {
-	struct rapl_pmu *pmu = container_of(hrtimer, struct rapl_pmu, hrtimer);
+	struct rapl_pmu *rapl_pmu = container_of(hrtimer, struct rapl_pmu, hrtimer);
 	struct perf_event *event;
 	unsigned long flags;
 
-	if (!pmu->n_active)
+	if (!rapl_pmu->n_active)
 		return HRTIMER_NORESTART;
 
-	raw_spin_lock_irqsave(&pmu->lock, flags);
+	raw_spin_lock_irqsave(&rapl_pmu->lock, flags);
 
-	list_for_each_entry(event, &pmu->active_list, active_entry)
+	list_for_each_entry(event, &rapl_pmu->active_list, active_entry)
 		rapl_event_update(event);
 
-	raw_spin_unlock_irqrestore(&pmu->lock, flags);
+	raw_spin_unlock_irqrestore(&rapl_pmu->lock, flags);
 
-	hrtimer_forward_now(hrtimer, pmu->timer_interval);
+	hrtimer_forward_now(hrtimer, rapl_pmu->timer_interval);
 
 	return HRTIMER_RESTART;
 }
 
-static void rapl_hrtimer_init(struct rapl_pmu *pmu)
+static void rapl_hrtimer_init(struct rapl_pmu *rapl_pmu)
 {
-	struct hrtimer *hr = &pmu->hrtimer;
+	struct hrtimer *hr = &rapl_pmu->hrtimer;
 
 	hrtimer_init(hr, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 	hr->function = rapl_hrtimer_handle;
 }
 
-static void __rapl_pmu_event_start(struct rapl_pmu *pmu,
+static void __rapl_pmu_event_start(struct rapl_pmu *rapl_pmu,
 				   struct perf_event *event)
 {
 	if (WARN_ON_ONCE(!(event->hw.state & PERF_HES_STOPPED)))
@@ -262,39 +262,39 @@ static void __rapl_pmu_event_start(struc
 
 	event->hw.state = 0;
 
-	list_add_tail(&event->active_entry, &pmu->active_list);
+	list_add_tail(&event->active_entry, &rapl_pmu->active_list);
 
 	local64_set(&event->hw.prev_count, rapl_read_counter(event));
 
-	pmu->n_active++;
-	if (pmu->n_active == 1)
-		rapl_start_hrtimer(pmu);
+	rapl_pmu->n_active++;
+	if (rapl_pmu->n_active == 1)
+		rapl_start_hrtimer(rapl_pmu);
 }
 
 static void rapl_pmu_event_start(struct perf_event *event, int mode)
 {
-	struct rapl_pmu *pmu = event->pmu_private;
+	struct rapl_pmu *rapl_pmu = event->pmu_private;
 	unsigned long flags;
 
-	raw_spin_lock_irqsave(&pmu->lock, flags);
-	__rapl_pmu_event_start(pmu, event);
-	raw_spin_unlock_irqrestore(&pmu->lock, flags);
+	raw_spin_lock_irqsave(&rapl_pmu->lock, flags);
+	__rapl_pmu_event_start(rapl_pmu, event);
+	raw_spin_unlock_irqrestore(&rapl_pmu->lock, flags);
 }
 
 static void rapl_pmu_event_stop(struct perf_event *event, int mode)
 {
-	struct rapl_pmu *pmu = event->pmu_private;
+	struct rapl_pmu *rapl_pmu = event->pmu_private;
 	struct hw_perf_event *hwc = &event->hw;
 	unsigned long flags;
 
-	raw_spin_lock_irqsave(&pmu->lock, flags);
+	raw_spin_lock_irqsave(&rapl_pmu->lock, flags);
 
 	/* mark event as deactivated and stopped */
 	if (!(hwc->state & PERF_HES_STOPPED)) {
-		WARN_ON_ONCE(pmu->n_active <= 0);
-		pmu->n_active--;
-		if (pmu->n_active == 0)
-			hrtimer_cancel(&pmu->hrtimer);
+		WARN_ON_ONCE(rapl_pmu->n_active <= 0);
+		rapl_pmu->n_active--;
+		if (rapl_pmu->n_active == 0)
+			hrtimer_cancel(&rapl_pmu->hrtimer);
 
 		list_del(&event->active_entry);
 
@@ -312,23 +312,23 @@ static void rapl_pmu_event_stop(struct p
 		hwc->state |= PERF_HES_UPTODATE;
 	}
 
-	raw_spin_unlock_irqrestore(&pmu->lock, flags);
+	raw_spin_unlock_irqrestore(&rapl_pmu->lock, flags);
 }
 
 static int rapl_pmu_event_add(struct perf_event *event, int mode)
 {
-	struct rapl_pmu *pmu = event->pmu_private;
+	struct rapl_pmu *rapl_pmu = event->pmu_private;
 	struct hw_perf_event *hwc = &event->hw;
 	unsigned long flags;
 
-	raw_spin_lock_irqsave(&pmu->lock, flags);
+	raw_spin_lock_irqsave(&rapl_pmu->lock, flags);
 
 	hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED;
 
 	if (mode & PERF_EF_START)
-		__rapl_pmu_event_start(pmu, event);
+		__rapl_pmu_event_start(rapl_pmu, event);
 
-	raw_spin_unlock_irqrestore(&pmu->lock, flags);
+	raw_spin_unlock_irqrestore(&rapl_pmu->lock, flags);
 
 	return 0;
 }
@@ -342,7 +342,7 @@ static int rapl_pmu_event_init(struct pe
 {
 	u64 cfg = event->attr.config & RAPL_EVENT_MASK;
 	int bit, ret = 0;
-	struct rapl_pmu *pmu;
+	struct rapl_pmu *rapl_pmu;
 	unsigned int rapl_pmu_idx;
 
 	/* only look at RAPL events */
@@ -375,10 +375,11 @@ static int rapl_pmu_event_init(struct pe
 		return -EINVAL;
 
 	/* must be done before validate_group */
-	pmu = rapl_pmus->pmus[rapl_pmu_idx];
-	if (!pmu)
+	rapl_pmu = rapl_pmus->rapl_pmu[rapl_pmu_idx];
+	if (!rapl_pmu)
 		return -EINVAL;
-	event->pmu_private = pmu;
+
+	event->pmu_private = rapl_pmu;
 	event->hw.event_base = rapl_msrs[bit].msr;
 	event->hw.config = cfg;
 	event->hw.idx = bit;
@@ -605,7 +606,7 @@ static void cleanup_rapl_pmus(void)
 	int i;
 
 	for (i = 0; i < rapl_pmus->nr_rapl_pmu; i++)
-		kfree(rapl_pmus->pmus[i]);
+		kfree(rapl_pmus->rapl_pmu[i]);
 	kfree(rapl_pmus);
 }
 
@@ -620,27 +621,27 @@ static const struct attribute_group *rap
 
 static int __init init_rapl_pmu(void)
 {
-	struct rapl_pmu *pmu;
+	struct rapl_pmu *rapl_pmu;
 	int idx;
 
 	for (idx = 0; idx < rapl_pmus->nr_rapl_pmu; idx++) {
-		pmu = kzalloc(sizeof(*pmu), GFP_KERNEL);
-		if (!pmu)
+		rapl_pmu = kzalloc(sizeof(*rapl_pmu), GFP_KERNEL);
+		if (!rapl_pmu)
 			goto free;
 
-		raw_spin_lock_init(&pmu->lock);
-		INIT_LIST_HEAD(&pmu->active_list);
-		pmu->pmu = &rapl_pmus->pmu;
-		pmu->timer_interval = ms_to_ktime(rapl_timer_ms);
-		rapl_hrtimer_init(pmu);
+		raw_spin_lock_init(&rapl_pmu->lock);
+		INIT_LIST_HEAD(&rapl_pmu->active_list);
+		rapl_pmu->pmu = &rapl_pmus->pmu;
+		rapl_pmu->timer_interval = ms_to_ktime(rapl_timer_ms);
+		rapl_hrtimer_init(rapl_pmu);
 
-		rapl_pmus->pmus[idx] = pmu;
+		rapl_pmus->rapl_pmu[idx] = rapl_pmu;
 	}
 
 	return 0;
 free:
 	for (; idx > 0; idx--)
-		kfree(rapl_pmus->pmus[idx - 1]);
+		kfree(rapl_pmus->rapl_pmu[idx - 1]);
 	return -ENOMEM;
 }
 
@@ -654,7 +655,7 @@ static int __init init_rapl_pmus(void)
 		rapl_pmu_scope = PERF_PMU_SCOPE_DIE;
 	}
 
-	rapl_pmus = kzalloc(struct_size(rapl_pmus, pmus, nr_rapl_pmu), GFP_KERNEL);
+	rapl_pmus = kzalloc(struct_size(rapl_pmus, rapl_pmu, nr_rapl_pmu), GFP_KERNEL);
 	if (!rapl_pmus)
 		return -ENOMEM;