Commit 2d281d81 authored by Jacob Pan's avatar Jacob Pan Committed by Rafael J. Wysocki

PowerCap: Introduce Intel RAPL power capping driver

The Intel Running Average Power Limit (RAPL) technology provides platform
software with the ability to monitor, control, and get notifications on
power usage.

This feature is present in all Sandy Bridge and later Intel processors.
Newer models allow more fine grained controls to be applied.  In RAPL,
power control is divided into domains, which include package, DRAM
controller, CPU core (Power Plane 0), graphics uncore (power plane 1), etc.

The purpose of this driver is to expose the RAPL settings to userspace.
Overall, RAPL fits in the new powercap class driver in that platform
level power capping controls are exposed via this generic interface.

This driver is based on an earlier patch from Zhang Rui.

However, while the previous work was mainly focused on thermal monitoring
the focus here is on the usability from user space perspective.

References: https://lkml.org/lkml/2011/5/26/93Signed-off-by: default avatarSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: default avatarJacob Pan <jacob.jun.pan@linux.intel.com>
Reviewed-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent bfd1ff63
...@@ -15,5 +15,18 @@ menuconfig POWERCAP ...@@ -15,5 +15,18 @@ menuconfig POWERCAP
if POWERCAP if POWERCAP
# Client driver configurations go here. # Client driver configurations go here.
config INTEL_RAPL
tristate "Intel RAPL Support"
depends on X86
default n
---help---
This enables support for the Intel Running Average Power Limit (RAPL)
technology which allows power limits to be enforced and monitored on
modern Intel processors (Sandy Bridge and later).
In RAPL, the platform level settings are divided into domains for
fine grained control. These domains include processor package, DRAM
controller, CPU core (Power Plance 0), graphics uncore (Power Plane
1), etc.
endif endif
obj-$(CONFIG_POWERCAP) += powercap_sys.o obj-$(CONFIG_POWERCAP) += powercap_sys.o
obj-$(CONFIG_INTEL_RAPL) += intel_rapl.o
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