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PM: EM: Implement em_notify_pd_created/updated()

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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@igalia.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Link: https://patch.msgid.link/20251020220914.320832-10-changwoo@igalia.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Changwoo Min 2025-10-21 07:09:13 +09:00 • committed by Rafael J. Wysocki
parent b2b1bbcac7
commit b95a0c02ad
2 changed files with 50 additions and 0 deletions
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44
kernel/power/em_netlink.c
View file

@ -215,6 +215,50 @@ out_free_msg:
/**************************** Event encoding *********************************/
static void __em_notify_pd_table(const struct em_perf_domain *pd, int ntf_type)
{
struct sk_buff *msg;
int msg_sz, ret = -EMSGSIZE;
void *hdr;
if (!genl_has_listeners(&em_nl_family, &init_net, EM_NLGRP_EVENT))
return;
msg_sz = __em_nl_get_pd_table_size(pd);
msg = genlmsg_new(msg_sz, GFP_KERNEL);
if (!msg)
return;
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;
out_free_msg:
nlmsg_free(msg);
return;
}
void em_notify_pd_created(const struct em_perf_domain *pd)
{
__em_notify_pd_table(pd, EM_CMD_PD_CREATED);
}
void em_notify_pd_updated(const struct em_perf_domain *pd)
{
__em_notify_pd_table(pd, EM_CMD_PD_UPDATED);
}
static int __em_notify_pd_deleted_size(const struct em_perf_domain *pd)
{
int id_sz = nla_total_size(sizeof(u32)); /* EM_A_PD_TABLE_PD_ID */

6
kernel/power/em_netlink.h
View file

@ -13,7 +13,9 @@
int for_each_em_perf_domain(int (*cb)(struct em_perf_domain*, void *),
void *data);
struct em_perf_domain *em_perf_domain_get_by_id(int id);
void em_notify_pd_created(const struct em_perf_domain *pd);
void em_notify_pd_deleted(const struct em_perf_domain *pd);
void em_notify_pd_updated(const struct em_perf_domain *pd);
#else
static inline
int for_each_em_perf_domain(int (*cb)(struct em_perf_domain*, void *),
@ -27,7 +29,11 @@ struct em_perf_domain *em_perf_domain_get_by_id(int id)
return NULL;
}
static inline void em_notify_pd_created(const struct em_perf_domain *pd) {}
static inline void em_notify_pd_deleted(const struct em_perf_domain *pd) {}
static inline void em_notify_pd_updated(const struct em_perf_domain *pd) {}
#endif
#endif /* _EM_NETLINK_H */