linux-kernel - [PATCH v5 10/10] PM: EM: Notify an event when the performance domain changes

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Message-ID: <20251014001055.772422-11-changwoo@igalia.com>
Date: Tue, 14 Oct 2025 09:10:55 +0900
From: Changwoo Min <changwoo@...lia.com>
To: lukasz.luba@....com,
	rafael@...nel.org,
	len.brown@...el.com,
	pavel@...nel.org
Cc: christian.loehle@....com,
	tj@...nel.org,
	kernel-dev@...lia.com,
	linux-pm@...r.kernel.org,
	sched-ext@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Changwoo Min <changwoo@...lia.com>
Subject: [PATCH v5 10/10] PM: EM: Notify an event when the performance domain changes

Send an event to userspace when a performance domain is created or deleted,
or its energy model is updated.

Signed-off-by: Changwoo Min <changwoo@...lia.com>
Reviewed-by: Lukasz Luba <lukasz.luba@....com>
---
 kernel/power/energy_model.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c
index 43a243f9cfa2..92c12b5983ed 100644
--- a/kernel/power/energy_model.c
+++ b/kernel/power/energy_model.c
@@ -352,6 +352,8 @@ int em_dev_update_perf_domain(struct device *dev,
 	em_table_free(old_table);
 
 	mutex_unlock(&em_pd_mutex);
+
+	em_notify_pd_updated(pd);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(em_dev_update_perf_domain);
@@ -696,6 +698,7 @@ int em_dev_register_pd_no_update(struct device *dev, unsigned int nr_states,
 	list_add_tail(&dev->em_pd->node, &em_pd_list);
 	mutex_unlock(&em_pd_list_mutex);
 
+	em_notify_pd_created(dev->em_pd);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(em_dev_register_pd_no_update);
@@ -718,6 +721,8 @@ void em_dev_unregister_perf_domain(struct device *dev)
 	list_del_init(&dev->em_pd->node);
 	mutex_unlock(&em_pd_list_mutex);
 
+	em_notify_pd_deleted(dev->em_pd);
+
 	/*
 	 * The mutex separates all register/unregister requests and protects
 	 * from potential clean-up/setup issues in the debugfs directories.
-- 
2.51.0