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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/dev_energymodel.h>
#include "em_netlink.h"
#include "em_netlink_autogen.h"
/*************************** Command encoding ********************************/
struct dump_ctx {
int idx;
int start;
struct sk_buff *skb;
struct netlink_callback *cb;
};
static int __em_nl_get_pd_size(struct em_perf_domain *pd, void *data)
{
int nr_cpus, msg_sz, cpus_sz;
int *tot_msg_sz = data;
nr_cpus = cpumask_weight(to_cpumask(pd->cpus));
cpus_sz = nla_total_size_64bit(sizeof(u64)) * nr_cpus;
msg_sz = nla_total_size(0) +
/* DEV_ENERGYMODEL_A_PERF_DOMAINS_PERF_DOMAIN */
nla_total_size(sizeof(u32)) +
/* DEV_ENERGYMODEL_A_PERF_DOMAIN_PERF_DOMAIN_ID */
nla_total_size_64bit(sizeof(u64)) +
/* DEV_ENERGYMODEL_A_PERF_DOMAIN_FLAGS */
nla_total_size(cpus_sz);
/* DEV_ENERGYMODEL_A_PERF_DOMAIN_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)
{
struct sk_buff *msg = data;
struct cpumask *cpumask;
int cpu;
if (nla_put_u32(msg, DEV_ENERGYMODEL_A_PERF_DOMAIN_PERF_DOMAIN_ID,
pd->id))
goto out_cancel_nest;
if (nla_put_u64_64bit(msg, DEV_ENERGYMODEL_A_PERF_DOMAIN_FLAGS,
pd->flags, DEV_ENERGYMODEL_A_PERF_DOMAIN_PAD))
goto out_cancel_nest;
cpumask = to_cpumask(pd->cpus);
for_each_cpu(cpu, cpumask) {
if (nla_put_u64_64bit(msg, DEV_ENERGYMODEL_A_PERF_DOMAIN_CPUS,
cpu, DEV_ENERGYMODEL_A_PERF_DOMAIN_PAD))
goto out_cancel_nest;
}
return 0;
out_cancel_nest:
return -EMSGSIZE;
}
static int __em_nl_get_pd_for_dump(struct em_perf_domain *pd, void *data)
{
const struct genl_info *info;
struct dump_ctx *ctx = data;
void *hdr;
int ret;
if (ctx->idx++ < ctx->start)
return 0;
info = genl_info_dump(ctx->cb);
hdr = genlmsg_iput(ctx->skb, info);
if (!hdr) {
genlmsg_cancel(ctx->skb, hdr);
return -EMSGSIZE;
}
ret = __em_nl_get_pd(pd, ctx->skb);
genlmsg_end(ctx->skb, hdr);
return ret;
}
int dev_energymodel_nl_get_perf_domains_doit(struct sk_buff *skb,
struct genl_info *info)
{
int id, ret = -EMSGSIZE, msg_sz = 0;
int cmd = info->genlhdr->cmd;
struct em_perf_domain *pd;
struct sk_buff *msg;
void *hdr;
if (!info->attrs[DEV_ENERGYMODEL_A_PERF_DOMAIN_PERF_DOMAIN_ID])
return -EINVAL;
id = nla_get_u32(info->attrs[DEV_ENERGYMODEL_A_PERF_DOMAIN_PERF_DOMAIN_ID]);
pd = em_perf_domain_get_by_id(id);
__em_nl_get_pd_size(pd, &msg_sz);
msg = genlmsg_new(msg_sz, GFP_KERNEL);
if (!msg)
return -ENOMEM;
hdr = genlmsg_put_reply(msg, info, &dev_energymodel_nl_family, 0, cmd);
if (!hdr)
goto out_free_msg;
ret = __em_nl_get_pd(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;
}
int dev_energymodel_nl_get_perf_domains_dumpit(struct sk_buff *skb,
struct netlink_callback *cb)
{
struct dump_ctx ctx = {
.idx = 0,
.start = cb->args[0],
.skb = skb,
.cb = cb,
};
return for_each_em_perf_domain(__em_nl_get_pd_for_dump, &ctx);
}
static struct em_perf_domain *__em_nl_get_pd_table_id(struct nlattr **attrs)
{
struct em_perf_domain *pd;
int id;
if (!attrs[DEV_ENERGYMODEL_A_PERF_TABLE_PERF_DOMAIN_ID])
return NULL;
id = nla_get_u32(attrs[DEV_ENERGYMODEL_A_PERF_TABLE_PERF_DOMAIN_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));
/* DEV_ENERGYMODEL_A_PERF_TABLE_PERF_DOMAIN_ID */
ps_sz = nla_total_size(0) +
/* DEV_ENERGYMODEL_A_PERF_TABLE_PERF_STATE */
nla_total_size_64bit(sizeof(u64)) +
/* DEV_ENERGYMODEL_A_PERF_STATE_PERFORMANCE */
nla_total_size_64bit(sizeof(u64)) +
/* DEV_ENERGYMODEL_A_PERF_STATE_FREQUENCY */
nla_total_size_64bit(sizeof(u64)) +
/* DEV_ENERGYMODEL_A_PERF_STATE_POWER */
nla_total_size_64bit(sizeof(u64)) +
/* DEV_ENERGYMODEL_A_PERF_STATE_COST */
nla_total_size_64bit(sizeof(u64));
/* DEV_ENERGYMODEL_A_PERF_STATE_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, DEV_ENERGYMODEL_A_PERF_TABLE_PERF_DOMAIN_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,
DEV_ENERGYMODEL_A_PERF_TABLE_PERF_STATE);
if (!entry)
goto out_unlock_ps;
if (nla_put_u64_64bit(msg,
DEV_ENERGYMODEL_A_PERF_STATE_PERFORMANCE,
ps->performance,
DEV_ENERGYMODEL_A_PERF_STATE_PAD))
goto out_cancel_ps_nest;
if (nla_put_u64_64bit(msg,
DEV_ENERGYMODEL_A_PERF_STATE_FREQUENCY,
ps->frequency,
DEV_ENERGYMODEL_A_PERF_STATE_PAD))
goto out_cancel_ps_nest;
if (nla_put_u64_64bit(msg,
DEV_ENERGYMODEL_A_PERF_STATE_POWER,
ps->power,
DEV_ENERGYMODEL_A_PERF_STATE_PAD))
goto out_cancel_ps_nest;
if (nla_put_u64_64bit(msg,
DEV_ENERGYMODEL_A_PERF_STATE_COST,
ps->cost,
DEV_ENERGYMODEL_A_PERF_STATE_PAD))
goto out_cancel_ps_nest;
if (nla_put_u64_64bit(msg,
DEV_ENERGYMODEL_A_PERF_STATE_FLAGS,
ps->flags,
DEV_ENERGYMODEL_A_PERF_STATE_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 dev_energymodel_nl_get_perf_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, &dev_energymodel_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(&dev_energymodel_nl_family, &init_net, DEV_ENERGYMODEL_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, &dev_energymodel_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(&dev_energymodel_nl_family, msg, 0,
DEV_ENERGYMODEL_NLGRP_EVENT, GFP_KERNEL);
return;
out_free_msg:
nlmsg_free(msg);
}
void em_notify_pd_created(const struct em_perf_domain *pd)
{
__em_notify_pd_table(pd, DEV_ENERGYMODEL_CMD_PERF_DOMAIN_CREATED);
}
void em_notify_pd_updated(const struct em_perf_domain *pd)
{
__em_notify_pd_table(pd, DEV_ENERGYMODEL_CMD_PERF_DOMAIN_UPDATED);
}
static int __em_notify_pd_deleted_size(const struct em_perf_domain *pd)
{
int id_sz = nla_total_size(sizeof(u32)); /* DEV_ENERGYMODEL_A_PERF_TABLE_PERF_DOMAIN_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(&dev_energymodel_nl_family, &init_net,
DEV_ENERGYMODEL_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, &dev_energymodel_nl_family, 0,
DEV_ENERGYMODEL_CMD_PERF_DOMAIN_DELETED);
if (!hdr)
goto out_free_msg;
if (nla_put_u32(msg, DEV_ENERGYMODEL_A_PERF_TABLE_PERF_DOMAIN_ID,
pd->id))
goto out_free_msg;
genlmsg_end(msg, hdr);
genlmsg_multicast(&dev_energymodel_nl_family, msg, 0,
DEV_ENERGYMODEL_NLGRP_EVENT, GFP_KERNEL);
return;
out_free_msg:
nlmsg_free(msg);
}
/**************************** Initialization *********************************/
static int __init em_netlink_init(void)
{
return genl_register_family(&dev_energymodel_nl_family);
}
postcore_initcall(em_netlink_init);
|
