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thermal: netlink: Add a new event to notify CPU capabilities change

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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>
This commit is contained in:
Srinivas Pandruvada 2022-01-27 11:34:53 -08:00 • committed by Rafael J. Wysocki
parent ab09b0744a
commit e4b1eb24ce
3 changed files with 72 additions and 1 deletions
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6
include/uapi/linux/thermal.h
View file

@ -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)