Commit b2b1bbca authored by Changwoo Min's avatar Changwoo Min Committed by Rafael J. Wysocki
Browse files

PM: EM: Implement em_notify_pd_deleted() 



Add the event notification infrastructure and implement the event
notification for when a performance domain is deleted (EM_CMD_PD_DELETED).

The event contains the ID of the performance domain (EM_A_PD_TABLE_PD_ID)
so the userspace can identify the changed performance domain for further
processing.

Signed-off-by: default avatarChangwoo Min <changwoo@igalia.com>
Reviewed-by: default avatarLukasz Luba <lukasz.luba@arm.com>
Link: https://patch.msgid.link/20251020220914.320832-9-changwoo@igalia.com


Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent f2d2946e

kernel/power/em_netlink.c

+44 −0
Original line number Diff line number Diff line
@@ -213,6 +213,50 @@ int em_nl_get_pd_table_doit(struct sk_buff *skb, struct genl_info *info) 
	return ret;

}





/**************************** Event encoding *********************************/

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 */



	return nlmsg_total_size(genlmsg_msg_size(id_sz));

}



void em_notify_pd_deleted(const struct em_perf_domain *pd)

{

	struct sk_buff *msg;

	void *hdr;

	int msg_sz;



	if (!genl_has_listeners(&em_nl_family, &init_net, EM_NLGRP_EVENT))

		return;



	msg_sz = __em_notify_pd_deleted_size(pd);



	msg = genlmsg_new(msg_sz, GFP_KERNEL);

	if (!msg)

		return;



	hdr = genlmsg_put(msg, 0, 0, &em_nl_family, 0, EM_CMD_PD_DELETED);

	if (!hdr)

		goto out_free_msg;



	if (nla_put_u32(msg, EM_A_PD_TABLE_PD_ID, pd->id)) {

		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;

}



/**************************** Initialization *********************************/

static int __init em_netlink_init(void)

{

	return genl_register_family(&em_nl_family);

kernel/power/em_netlink.h

+3 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 
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_deleted(const struct em_perf_domain *pd);

#else

static inline

int for_each_em_perf_domain(int (*cb)(struct em_perf_domain*, void *),
@@ -25,6 +26,8 @@ struct em_perf_domain *em_perf_domain_get_by_id(int id) 
{

	return NULL;

}



static inline void em_notify_pd_deleted(const struct em_perf_domain *pd) {}

#endif



#endif /* _EM_NETLINK_H */