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authorJacob Pan <jacob.jun.pan@linux.intel.com>2013-10-17 10:28:35 -0700
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-10-18 13:29:52 +0200
commit2d281d8196e38dd3a4ee9af26621ddde8329f269 (patch)
treef3cce224bd2909635e8b311ae27d6234b9b0d9cc /drivers/usb
parentbfd1ff6375c82930bfb3b401eee2c96720fa8e84 (diff)
downloadlinux-2d281d8196e38dd3a4ee9af26621ddde8329f269.tar.bz2
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/2011/5/26/93 Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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