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| author | Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | 2022-01-27 11:34:54 -0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-02-03 19:50:49 +0100 |
| commit | bd30cdfd9bd73b68e4977ce7c5540aa7b14c25cd (patch) | |
| tree | 543219e79331a3edbc9b9f007331b2556d4f2209 /drivers/thermal/intel/Kconfig | |
| parent | e4b1eb24ce5a696ef7229f9926ff34d7502f0582 (diff) | |
| download | linux-bd30cdfd9bd73b68e4977ce7c5540aa7b14c25cd.tar.bz2 | |
thermal: intel: hfi: Notify user space for HFI events
When the hardware issues an HFI event, relay a notification to user space.
This allows user space to respond by reading performance and efficiency of
each CPU and take appropriate action.
For example, when the performance and efficiency of a CPU is 0, user space
can either offline the CPU or inject idle. Also, if user space notices a
downward trend in performance, it may proactively adjust power limits to
avoid future situations in which performance drops to 0.
To avoid excessive notifications, the rate is limited by one HZ per event.
To limit the netlink message size, send parameters for up to 16 CPUs in a
single message. If there are more than 16 CPUs, issue as many messages as
needed to notify the status of all CPUs.
In the HFI specification, both performance and efficiency capabilities are
defined in the [0, 255] range. The existing implementations of HFI hardware
do not scale the maximum values to 255. Since userspace cares about
capability values that are either 0 or show a downward/upward trend, this
fact does not matter much. Relative changes in capabilities are enough. To
comply with the thermal netlink ABI, scale both performance and efficiency
capabilities to the [0, 1023] interval.
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>
Diffstat (limited to 'drivers/thermal/intel/Kconfig')
| -rw-r--r-- | drivers/thermal/intel/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/thermal/intel/Kconfig b/drivers/thermal/intel/Kconfig index e9d2925227d4..6cf3fe36a4ae 100644 --- a/drivers/thermal/intel/Kconfig +++ b/drivers/thermal/intel/Kconfig @@ -104,6 +104,7 @@ config INTEL_HFI_THERMAL bool "Intel Hardware Feedback Interface" depends on CPU_SUP_INTEL depends on X86_THERMAL_VECTOR + select THERMAL_NETLINK help Select this option to enable the Hardware Feedback Interface. If selected, hardware provides guidance to the operating system on |