linux-kernel - [PATCH v2 09/10] PM: EM: Implement em_notify_pd

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Message-ID: <20250613094428.267791-10-changwoo@igalia.com>
Date: Fri, 13 Jun 2025 18:44:27 +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 v2 09/10] PM: EM: Implement em_notify_pd_created/updated().

Implement two event notifications when a performance domain is created
(EM_CMD_PD_CREATED) and updated (EM_CMD_PD_UPDATED). The message format
of these two event notifications is the same as EM_CMD_GET_PD_TABLE --
containing the performance domain's ID and its energy model table.

Signed-off-by: Changwoo Min <changwoo@...lia.com>
---
 kernel/power/em_netlink.c | 38 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 36 insertions(+), 2 deletions(-)

diff --git a/kernel/power/em_netlink.c b/kernel/power/em_netlink.c
index 4e34799fd1f8..d42da92d1af4 100644
--- a/kernel/power/em_netlink.c
+++ b/kernel/power/em_netlink.c
@@ -215,14 +215,48 @@ int em_nl_get_pd_table_doit(struct sk_buff *skb, struct genl_info *info)
 
 
 /**************************** Event encoding *********************************/
+static int __em_notify_pd_table(const struct em_perf_domain *pd, int ntf_type)
+{
+	struct sk_buff *msg;
+	int msg_sz, ret;
+	void *hdr;
+
+	if (!genl_has_listeners(&em_nl_family, &init_net, EM_NLGRP_EVENT))
+		return 0;
+
+	msg_sz = __em_nl_get_pd_table_size(pd);
+
+	msg = genlmsg_new(msg_sz, GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	hdr = genlmsg_put(msg, 0, 0, &em_nl_family, 0, ntf_type);
+	if (!hdr)
+		goto out_free_msg;
+
+	ret = __em_nl_get_pd_table(msg, pd);
+	if (ret)
+		goto out_free_msg;
+
+	genlmsg_end(msg, hdr);
+
+	genlmsg_multicast(&em_nl_family, msg, 0, EM_NLGRP_EVENT, GFP_KERNEL);
+
+	return 0;
+
+out_free_msg:
+	nlmsg_free(msg);
+	return ret;
+}
+
 int em_notify_pd_created(const struct em_perf_domain *pd)
 {
-	return -EOPNOTSUPP;
+	return __em_notify_pd_table(pd, EM_CMD_PD_CREATED);
 }
 
 int em_notify_pd_updated(const struct em_perf_domain *pd)
 {
-	return -EOPNOTSUPP;
+	return __em_notify_pd_table(pd, EM_CMD_PD_UPDATED);
 }
 
 static int __em_notify_pd_deleted_size(const struct em_perf_domain *pd)
-- 
2.49.0