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PM: EM: Implement em_nl_get_pds_doit()

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When a userspace requests EM_CMD_GET_PDS, the kernel responds with
information on all performance domains. The message format of the
response is as follows:

EM_A_PDS_PD (NLA_NESTED)*
    EM_A_PD_PD_ID (NLA_U32)
    EM_A_PD_FLAGS (NLA_U64)
    EM_A_PD_CPUS (NLA_STRING)

where EM_A_PDS_PD can be repeated as many times as there are performance
domains, and EM_A_PD_CPUS is a hexadecimal string representing a CPU
bitmask.

Signed-off-by: Changwoo Min <changwoo@igalia.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Link: https://patch.msgid.link/20251020220914.320832-7-changwoo@igalia.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Changwoo Min
2025-10-21 07:09:10 +09:00
committed by Rafael J. Wysocki
parent 7928339cfe
commit d8eef04531
1 changed files with 81 additions and 1 deletions
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82
kernel/power/em_netlink.c
View File

@@ -17,9 +17,89 @@
#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)
{
return -EOPNOTSUPP;
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;
}
int em_nl_get_pd_table_doit(struct sk_buff *skb, struct genl_info *info)