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thermal: netlink: Add genetlink bind/unbind notifications

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Introduce a new feature to the thermal netlink framework, enabling the
registration of sub drivers to receive events via a notifier mechanism.
Specifically, implement genetlink family bind and unbind callbacks to send
BIND and UNBIND events.

The primary purpose of this enhancement is to facilitate the tracking of
user-space consumers by the Intel HFI driver. By leveraging these
notifications, the driver can determine when consumers are present
or absent.

Suggested-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Stanislaw Gruszka 2024-02-23 16:59:40 +01:00 committed by Rafael J. Wysocki
parent f67cf45dee
commit cf580ad490
2 changed files with 61 additions and 5 deletions
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40
drivers/thermal/thermal_netlink.c
View file

@ -7,17 +7,13 @@
* Generic netlink for thermal management framework
*/
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/kernel.h>
#include <net/genetlink.h>
#include <uapi/linux/thermal.h>
#include "thermal_core.h"
enum thermal_genl_multicast_groups {
THERMAL_GENL_SAMPLING_GROUP = 0,
THERMAL_GENL_EVENT_GROUP = 1,
};
static const struct genl_multicast_group thermal_genl_mcgrps[] = {
[THERMAL_GENL_SAMPLING_GROUP] = { .name = THERMAL_GENL_SAMPLING_GROUP_NAME, },
[THERMAL_GENL_EVENT_GROUP] = { .name = THERMAL_GENL_EVENT_GROUP_NAME, },
@ -75,6 +71,7 @@ struct param {
typedef int (*cb_t)(struct param *);
static struct genl_family thermal_gnl_family;
static BLOCKING_NOTIFIER_HEAD(thermal_genl_chain);
static int thermal_group_has_listeners(enum thermal_genl_multicast_groups group)
{
@ -645,6 +642,27 @@ out_free_msg:
return ret;
}
static int thermal_genl_bind(int mcgrp)
{
struct thermal_genl_notify n = { .mcgrp = mcgrp };
if (WARN_ON_ONCE(mcgrp > THERMAL_GENL_MAX_GROUP))
return -EINVAL;
blocking_notifier_call_chain(&thermal_genl_chain, THERMAL_NOTIFY_BIND, &n);
return 0;
}
static void thermal_genl_unbind(int mcgrp)
{
struct thermal_genl_notify n = { .mcgrp = mcgrp };
if (WARN_ON_ONCE(mcgrp > THERMAL_GENL_MAX_GROUP))
return;
blocking_notifier_call_chain(&thermal_genl_chain, THERMAL_NOTIFY_UNBIND, &n);
}
static const struct genl_small_ops thermal_genl_ops[] = {
{
.cmd = THERMAL_GENL_CMD_TZ_GET_ID,
@ -679,6 +697,8 @@ static struct genl_family thermal_gnl_family __ro_after_init = {
.version = THERMAL_GENL_VERSION,
.maxattr = THERMAL_GENL_ATTR_MAX,
.policy = thermal_genl_policy,
.bind = thermal_genl_bind,
.unbind = thermal_genl_unbind,
.small_ops = thermal_genl_ops,
.n_small_ops = ARRAY_SIZE(thermal_genl_ops),
.resv_start_op = THERMAL_GENL_CMD_CDEV_GET + 1,
@ -686,6 +706,16 @@ static struct genl_family thermal_gnl_family __ro_after_init = {
.n_mcgrps = ARRAY_SIZE(thermal_genl_mcgrps),
};
int thermal_genl_register_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_register(&thermal_genl_chain, nb);
}
int thermal_genl_unregister_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_unregister(&thermal_genl_chain, nb);
}
int __init thermal_netlink_init(void)
{
return genl_register_family(&thermal_gnl_family);

26
drivers/thermal/thermal_netlink.h
View file

@ -10,6 +10,19 @@ struct thermal_genl_cpu_caps {
int efficiency;
};
enum thermal_genl_multicast_groups {
THERMAL_GENL_SAMPLING_GROUP = 0,
THERMAL_GENL_EVENT_GROUP = 1,
THERMAL_GENL_MAX_GROUP = THERMAL_GENL_EVENT_GROUP,
};
#define THERMAL_NOTIFY_BIND 0
#define THERMAL_NOTIFY_UNBIND 1
struct thermal_genl_notify {
int mcgrp;
};
struct thermal_zone_device;
struct thermal_trip;
struct thermal_cooling_device;
@ -18,6 +31,9 @@ struct thermal_cooling_device;
#ifdef CONFIG_THERMAL_NETLINK
int __init thermal_netlink_init(void);
void __init thermal_netlink_exit(void);
int thermal_genl_register_notifier(struct notifier_block *nb);
int thermal_genl_unregister_notifier(struct notifier_block *nb);
int thermal_notify_tz_create(const struct thermal_zone_device *tz);
int thermal_notify_tz_delete(const struct thermal_zone_device *tz);
int thermal_notify_tz_enable(const struct thermal_zone_device *tz);
@ -48,6 +64,16 @@ static inline int thermal_notify_tz_create(const struct thermal_zone_device *tz)
return 0;
}
static inline int thermal_genl_register_notifier(struct notifier_block *nb)
{
return 0;
}
static inline int thermal_genl_unregister_notifier(struct notifier_block *nb)
{
return 0;
}
static inline int thermal_notify_tz_delete(const struct thermal_zone_device *tz)
{
return 0;