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Message-ID: <20250529001315.233492-11-changwoo@igalia.com>
Date: Thu, 29 May 2025 09:13:14 +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,
linux-kernel@...r.kernel.org,
Changwoo Min <changwoo@...lia.com>
Subject: [PATCH 10/11] PM: EM: Implement event notification.
Add the event notification infrastructure and implement event
notifications for three events -- when a performance domain is created
(EM_GENL_EVENT_PD_CREATE), deleted (EM_GENL_EVENT_PD_DELETE), or its
energy model is updated (EM_GENL_EVENT_PD_UPDATE).
The event contains the ID of the performance domain (EM_PD_GENL_ATTR_ID),
so the userspace can identify the changed performance domain for further
processing.
Signed-off-by: Changwoo Min <changwoo@...lia.com>
---
kernel/power/em_netlink.c | 89 +++++++++++++++++++++++++++++++++++++++
kernel/power/em_netlink.h | 19 +++++++++
2 files changed, 108 insertions(+)
diff --git a/kernel/power/em_netlink.c b/kernel/power/em_netlink.c
index 5f3d5aaa97d7..85d4077ec1b3 100644
--- a/kernel/power/em_netlink.c
+++ b/kernel/power/em_netlink.c
@@ -30,12 +30,101 @@ static const struct nla_policy em_genl_policy[EM_GENL_ATTR_MAX + 1] = {
struct param {
struct nlattr **attrs;
struct sk_buff *msg;
+ int pd_id;
};
typedef int (*cb_t)(struct param *);
static struct genl_family em_genl_family;
+/**************************** Event encoding *********************************/
+static int __em_genl_event_pd_id(struct param *p)
+{
+ if (nla_put_u32(p->msg, EM_PD_GENL_ATTR_ID, p->pd_id))
+ return -EMSGSIZE;
+
+ return 0;
+}
+
+static int em_genl_event_pd_create(struct param *p)
+{
+ return __em_genl_event_pd_id(p);
+}
+
+static int em_genl_event_pd_delete(struct param *p)
+{
+ return __em_genl_event_pd_id(p);
+}
+
+static int em_genl_event_pd_update(struct param *p)
+{
+ return __em_genl_event_pd_id(p);
+}
+
+static const cb_t event_cb[] = {
+ [EM_GENL_EVENT_PD_CREATE] = em_genl_event_pd_create,
+ [EM_GENL_EVENT_PD_DELETE] = em_genl_event_pd_delete,
+ [EM_GENL_EVENT_PD_UPDATE] = em_genl_event_pd_update,
+};
+
+static int em_genl_send_event(enum em_genl_event event, struct param *p)
+{
+ struct sk_buff *msg;
+ int ret = -EMSGSIZE;
+ void *hdr;
+
+ if (!genl_has_listeners(&em_genl_family, &init_net, EM_GENL_EVENT_GROUP))
+ return 0;
+
+ msg = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+ p->msg = msg;
+
+ hdr = genlmsg_put(msg, 0, 0, &em_genl_family, 0, event);
+ if (!hdr)
+ goto out_free_msg;
+
+ ret = event_cb[event](p);
+ if (ret)
+ goto out_cancel_msg;
+
+ genlmsg_end(msg, hdr);
+
+ genlmsg_multicast(&em_genl_family, msg, 0, EM_GENL_EVENT_GROUP, GFP_KERNEL);
+
+ return 0;
+
+out_cancel_msg:
+ genlmsg_cancel(msg, hdr);
+out_free_msg:
+ nlmsg_free(msg);
+
+ return ret;
+}
+
+int em_notify_pd_create(const struct em_perf_domain *pd)
+{
+ struct param p = { .pd_id = pd->id };
+
+ return em_genl_send_event(EM_GENL_EVENT_PD_CREATE, &p);
+}
+
+
+int em_notify_pd_delete(const struct em_perf_domain *pd)
+{
+ struct param p = { .pd_id = pd->id };
+
+ return em_genl_send_event(EM_GENL_EVENT_PD_DELETE, &p);
+}
+
+int em_notify_pd_update(const struct em_perf_domain *pd)
+{
+ struct param p = { .pd_id = pd->id };
+
+ return em_genl_send_event(EM_GENL_EVENT_PD_UPDATE, &p);
+}
+
/*************************** Command encoding ********************************/
static int __em_genl_cmd_pd_get_id(struct em_perf_domain *pd, void *data)
diff --git a/kernel/power/em_netlink.h b/kernel/power/em_netlink.h
index 8cedc6495916..34d5a98eec72 100644
--- a/kernel/power/em_netlink.h
+++ b/kernel/power/em_netlink.h
@@ -16,6 +16,10 @@ enum em_genl_multicast_groups {
#ifdef CONFIG_ENERGY_MODEL_NETLINK
int __init em_netlink_init(void);
void __init em_netlink_exit(void);
+
+int em_notify_pd_create(const struct em_perf_domain *pd);
+int em_notify_pd_delete(const struct em_perf_domain *pd);
+int em_notify_pd_update(const struct em_perf_domain *pd);
#else
static inline int em_netlink_init(void)
{
@@ -23,4 +27,19 @@ static inline int em_netlink_init(void)
}
static inline void em_netlink_exit(void) {}
+
+static inline int em_notify_pd_create(const struct em_perf_domain *pd)
+{
+ return 0;
+}
+
+static inline int em_notify_pd_delete(const struct em_perf_domain *pd)
+{
+ return 0;
+}
+
+static inline int em_notify_pd_update(const struct em_perf_domain *pd)
+{
+ return 0;
+}
#endif /* CONFIG_ENERGY_MODEL_NETLINK */
--
2.49.0
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