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// SPDX-License-Identifier: GPL-2.0
/*
*
* Generic netlink for energy model.
*
* Copyright (c) 2025 Valve Corporation.
* Author: Changwoo Min <changwoo@igalia.com>
*/
#define pr_fmt(fmt) "energy_model: " fmt
#include <linux/energy_model.h>
#include <net/sock.h>
#include <net/genetlink.h>
#include <uapi/linux/energy_model.h>
#include "em_netlink.h"
#include "em_netlink_autogen.h"
#define EM_A_PD_CPUS_LEN 256
/*************************** Command encoding ********************************/
static int __em_nl_get_pd_size(struct em_perf_domain *pd, void *data)
{
char cpus_buf[EM_A_PD_CPUS_LEN];
int *tot_msg_sz = data;
int msg_sz, cpus_sz;
cpus_sz = snprintf(cpus_buf, sizeof(cpus_buf), "%*pb",
cpumask_pr_args(to_cpumask(pd->cpus)));
msg_sz = nla_total_size(0) + /* EM_A_PDS_PD */
nla_total_size(sizeof(u32)) + /* EM_A_PD_PD_ID */
nla_total_size_64bit(sizeof(u64)) + /* EM_A_PD_FLAGS */
nla_total_size(cpus_sz); /* EM_A_PD_CPUS */
*tot_msg_sz += nlmsg_total_size(genlmsg_msg_size(msg_sz));
return 0;
}
static int __em_nl_get_pd(struct em_perf_domain *pd, void *data)
{
char cpus_buf[EM_A_PD_CPUS_LEN];
struct sk_buff *msg = data;
struct nlattr *entry;
entry = nla_nest_start(msg, EM_A_PDS_PD);
if (!entry)
goto out_cancel_nest;
if (nla_put_u32(msg, EM_A_PD_PD_ID, pd->id))
goto out_cancel_nest;
if (nla_put_u64_64bit(msg, EM_A_PD_FLAGS, pd->flags, EM_A_PD_PAD))
goto out_cancel_nest;
snprintf(cpus_buf, sizeof(cpus_buf), "%*pb",
cpumask_pr_args(to_cpumask(pd->cpus)));
if (nla_put_string(msg, EM_A_PD_CPUS, cpus_buf))
goto out_cancel_nest;
nla_nest_end(msg, entry);
return 0;
out_cancel_nest:
nla_nest_cancel(msg, entry);
return -EMSGSIZE;
}
int em_nl_get_pds_doit(struct sk_buff *skb, struct genl_info *info)
{
struct sk_buff *msg;
void *hdr;
int cmd = info->genlhdr->cmd;
int ret = -EMSGSIZE, msg_sz = 0;
for_each_em_perf_domain(__em_nl_get_pd_size, &msg_sz);
msg = genlmsg_new(msg_sz, GFP_KERNEL);
if (!msg)
return -ENOMEM;
hdr = genlmsg_put_reply(msg, info, &em_nl_family, 0, cmd);
if (!hdr)
goto out_free_msg;
ret = for_each_em_perf_domain(__em_nl_get_pd, msg);
if (ret)
goto out_cancel_msg;
genlmsg_end(msg, hdr);
return genlmsg_reply(msg, info);
out_cancel_msg:
genlmsg_cancel(msg, hdr);
out_free_msg:
nlmsg_free(msg);
return ret;
}
static struct em_perf_domain *__em_nl_get_pd_table_id(struct nlattr **attrs)
{
struct em_perf_domain *pd;
int id;
if (!attrs[EM_A_PD_TABLE_PD_ID])
return NULL;
id = nla_get_u32(attrs[EM_A_PD_TABLE_PD_ID]);
pd = em_perf_domain_get_by_id(id);
return pd;
}
static int __em_nl_get_pd_table_size(const struct em_perf_domain *pd)
{
int id_sz, ps_sz;
id_sz = nla_total_size(sizeof(u32)); /* EM_A_PD_TABLE_PD_ID */
ps_sz = nla_total_size(0) + /* EM_A_PD_TABLE_PS */
nla_total_size_64bit(sizeof(u64)) + /* EM_A_PS_PERFORMANCE */
nla_total_size_64bit(sizeof(u64)) + /* EM_A_PS_FREQUENCY */
nla_total_size_64bit(sizeof(u64)) + /* EM_A_PS_POWER */
nla_total_size_64bit(sizeof(u64)) + /* EM_A_PS_COST */
nla_total_size_64bit(sizeof(u64)); /* EM_A_PS_FLAGS */
ps_sz *= pd->nr_perf_states;
return nlmsg_total_size(genlmsg_msg_size(id_sz + ps_sz));
}
static int __em_nl_get_pd_table(struct sk_buff *msg, const struct em_perf_domain *pd)
{
struct em_perf_state *table, *ps;
struct nlattr *entry;
int i;
if (nla_put_u32(msg, EM_A_PD_TABLE_PD_ID, pd->id))
goto out_err;
rcu_read_lock();
table = em_perf_state_from_pd((struct em_perf_domain *)pd);
for (i = 0; i < pd->nr_perf_states; i++) {
ps = &table[i];
entry = nla_nest_start(msg, EM_A_PD_TABLE_PS);
if (!entry)
goto out_unlock_ps;
if (nla_put_u64_64bit(msg, EM_A_PS_PERFORMANCE,
ps->performance, EM_A_PS_PAD))
goto out_cancel_ps_nest;
if (nla_put_u64_64bit(msg, EM_A_PS_FREQUENCY,
ps->frequency, EM_A_PS_PAD))
goto out_cancel_ps_nest;
if (nla_put_u64_64bit(msg, EM_A_PS_POWER,
ps->power, EM_A_PS_PAD))
goto out_cancel_ps_nest;
if (nla_put_u64_64bit(msg, EM_A_PS_COST,
ps->cost, EM_A_PS_PAD))
goto out_cancel_ps_nest;
if (nla_put_u64_64bit(msg, EM_A_PS_FLAGS,
ps->flags, EM_A_PS_PAD))
goto out_cancel_ps_nest;
nla_nest_end(msg, entry);
}
rcu_read_unlock();
return 0;
out_cancel_ps_nest:
nla_nest_cancel(msg, entry);
out_unlock_ps:
rcu_read_unlock();
out_err:
return -EMSGSIZE;
}
int em_nl_get_pd_table_doit(struct sk_buff *skb, struct genl_info *info)
{
int cmd = info->genlhdr->cmd;
int msg_sz, ret = -EMSGSIZE;
struct em_perf_domain *pd;
struct sk_buff *msg;
void *hdr;
pd = __em_nl_get_pd_table_id(info->attrs);
if (!pd)
return -EINVAL;
msg_sz = __em_nl_get_pd_table_size(pd);
msg = genlmsg_new(msg_sz, GFP_KERNEL);
if (!msg)
return -ENOMEM;
hdr = genlmsg_put_reply(msg, info, &em_nl_family, 0, cmd);
if (!hdr)
goto out_free_msg;
ret = __em_nl_get_pd_table(msg, pd);
if (ret)
goto out_free_msg;
genlmsg_end(msg, hdr);
return genlmsg_reply(msg, info);
out_free_msg:
nlmsg_free(msg);
return ret;
}
/**************************** 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 */
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);
}
postcore_initcall(em_netlink_init);
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