From: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Date: Thu, 27 Jan 2022 11:34:53 -0800
Subject: thermal: netlink: Add a new event to notify CPU capabilities change
Git-commit: e4b1eb24ce5a696ef7229f9926ff34d7502f0582
Patch-mainline: 5.18-rc1
References: jsc#PED-820
Add a new netlink event to notify change in CPU capabilities in terms of
performance and efficiency.
Firmware may change CPU capabilities as a result of thermal events in the
system or to account for changes in the TDP (thermal design power) level.
This notification type will allow user space to avoid running workloads
on certain CPUs or proactively adjust power limits to avoid future events.
The netlink message consists of a nested attribute
(THERMAL_GENL_ATTR_CPU_CAPABILITY) with three attributes:
* THERMAL_GENL_ATTR_CPU_CAPABILITY_ID (type u32):
-- logical CPU number
* THERMAL_GENL_ATTR_CPU_CAPABILITY_PERFORMANCE (type u32):
-- Scaled performance from 0-1023
* THERMAL_GENL_ATTR_CPU_CAPABILITY_EFFICIENCY (type u32):
-- Scaled efficiency from 0-1023
Reviewed-by: Len Brown <len.brown@intel.com>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
drivers/thermal/thermal_netlink.c | 53 ++++++++++++++++++++++++++++++++++++++
drivers/thermal/thermal_netlink.h | 14 ++++++++++
include/uapi/linux/thermal.h | 6 +++-
3 files changed, 72 insertions(+), 1 deletion(-)
--- a/drivers/thermal/thermal_netlink.c
+++ b/drivers/thermal/thermal_netlink.c
@@ -43,6 +43,11 @@ static const struct nla_policy thermal_g
[THERMAL_GENL_ATTR_CDEV_MAX_STATE] = { .type = NLA_U32 },
[THERMAL_GENL_ATTR_CDEV_NAME] = { .type = NLA_STRING,
.len = THERMAL_NAME_LENGTH },
+ /* CPU capabilities */
+ [THERMAL_GENL_ATTR_CPU_CAPABILITY] = { .type = NLA_NESTED },
+ [THERMAL_GENL_ATTR_CPU_CAPABILITY_ID] = { .type = NLA_U32 },
+ [THERMAL_GENL_ATTR_CPU_CAPABILITY_PERFORMANCE] = { .type = NLA_U32 },
+ [THERMAL_GENL_ATTR_CPU_CAPABILITY_EFFICIENCY] = { .type = NLA_U32 },
};
struct param {
@@ -58,6 +63,8 @@ struct param {
int temp;
int cdev_state;
int cdev_max_state;
+ struct thermal_genl_cpu_caps *cpu_capabilities;
+ int cpu_capabilities_count;
};
typedef int (*cb_t)(struct param *);
@@ -189,6 +196,42 @@ static int thermal_genl_event_gov_change
return 0;
}
+static int thermal_genl_event_cpu_capability_change(struct param *p)
+{
+ struct thermal_genl_cpu_caps *cpu_cap = p->cpu_capabilities;
+ struct sk_buff *msg = p->msg;
+ struct nlattr *start_cap;
+ int i;
+
+ start_cap = nla_nest_start(msg, THERMAL_GENL_ATTR_CPU_CAPABILITY);
+ if (!start_cap)
+ return -EMSGSIZE;
+
+ for (i = 0; i < p->cpu_capabilities_count; ++i) {
+ if (nla_put_u32(msg, THERMAL_GENL_ATTR_CPU_CAPABILITY_ID,
+ cpu_cap->cpu))
+ goto out_cancel_nest;
+
+ if (nla_put_u32(msg, THERMAL_GENL_ATTR_CPU_CAPABILITY_PERFORMANCE,
+ cpu_cap->performance))
+ goto out_cancel_nest;
+
+ if (nla_put_u32(msg, THERMAL_GENL_ATTR_CPU_CAPABILITY_EFFICIENCY,
+ cpu_cap->efficiency))
+ goto out_cancel_nest;
+
+ ++cpu_cap;
+ }
+
+ nla_nest_end(msg, start_cap);
+
+ return 0;
+out_cancel_nest:
+ nla_nest_cancel(msg, start_cap);
+
+ return -EMSGSIZE;
+}
+
int thermal_genl_event_tz_delete(struct param *p)
__attribute__((alias("thermal_genl_event_tz")));
@@ -218,6 +261,7 @@ static cb_t event_cb[] = {
[THERMAL_GENL_EVENT_CDEV_DELETE] = thermal_genl_event_cdev_delete,
[THERMAL_GENL_EVENT_CDEV_STATE_UPDATE] = thermal_genl_event_cdev_state_update,
[THERMAL_GENL_EVENT_TZ_GOV_CHANGE] = thermal_genl_event_gov_change,
+ [THERMAL_GENL_EVENT_CPU_CAPABILITY_CHANGE] = thermal_genl_event_cpu_capability_change,
};
/*
@@ -355,6 +399,15 @@ int thermal_notify_tz_gov_change(int tz_
return thermal_genl_send_event(THERMAL_GENL_EVENT_TZ_GOV_CHANGE, &p);
}
+int thermal_genl_cpu_capability_event(int count,
+ struct thermal_genl_cpu_caps *caps)
+{
+ struct param p = { .cpu_capabilities_count = count, .cpu_capabilities = caps };
+
+ return thermal_genl_send_event(THERMAL_GENL_EVENT_CPU_CAPABILITY_CHANGE, &p);
+}
+EXPORT_SYMBOL_GPL(thermal_genl_cpu_capability_event);
+
/*************************** Command encoding ********************************/
static int __thermal_genl_cmd_tz_get_id(struct thermal_zone_device *tz,
--- a/drivers/thermal/thermal_netlink.h
+++ b/drivers/thermal/thermal_netlink.h
@@ -4,6 +4,12 @@
* Author: Daniel Lezcano <daniel.lezcano@linaro.org>
*/
+struct thermal_genl_cpu_caps {
+ int cpu;
+ int performance;
+ int efficiency;
+};
+
/* Netlink notification function */
#ifdef CONFIG_THERMAL_NETLINK
int __init thermal_netlink_init(void);
@@ -23,6 +29,8 @@ int thermal_notify_cdev_add(int cdev_id,
int thermal_notify_cdev_delete(int cdev_id);
int thermal_notify_tz_gov_change(int tz_id, const char *name);
int thermal_genl_sampling_temp(int id, int temp);
+int thermal_genl_cpu_capability_event(int count,
+ struct thermal_genl_cpu_caps *caps);
#else
static inline int thermal_netlink_init(void)
{
@@ -101,4 +109,10 @@ static inline int thermal_genl_sampling_
{
return 0;
}
+
+static inline int thermal_genl_cpu_capability_event(int count, struct cpu_capability *caps)
+{
+ return 0;
+}
+
#endif /* CONFIG_THERMAL_NETLINK */
--- a/include/uapi/linux/thermal.h
+++ b/include/uapi/linux/thermal.h
@@ -44,7 +44,10 @@ enum thermal_genl_attr {
THERMAL_GENL_ATTR_CDEV_MAX_STATE,
THERMAL_GENL_ATTR_CDEV_NAME,
THERMAL_GENL_ATTR_GOV_NAME,
-
+ THERMAL_GENL_ATTR_CPU_CAPABILITY,
+ THERMAL_GENL_ATTR_CPU_CAPABILITY_ID,
+ THERMAL_GENL_ATTR_CPU_CAPABILITY_PERFORMANCE,
+ THERMAL_GENL_ATTR_CPU_CAPABILITY_EFFICIENCY,
__THERMAL_GENL_ATTR_MAX,
};
#define THERMAL_GENL_ATTR_MAX (__THERMAL_GENL_ATTR_MAX - 1)
@@ -71,6 +74,7 @@ enum thermal_genl_event {
THERMAL_GENL_EVENT_CDEV_DELETE, /* Cdev unbound */
THERMAL_GENL_EVENT_CDEV_STATE_UPDATE, /* Cdev state updated */
THERMAL_GENL_EVENT_TZ_GOV_CHANGE, /* Governor policy changed */
+ THERMAL_GENL_EVENT_CPU_CAPABILITY_CHANGE, /* CPU capability changed */
__THERMAL_GENL_EVENT_MAX,
};
#define THERMAL_GENL_EVENT_MAX (__THERMAL_GENL_EVENT_MAX - 1)