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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-03-22 01:20:17 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-04-07 23:33:42 +0300
commitb9c273babce791cf228fc466577f55056a699f9c (patch)
treeea9f1103024da00c2ee7804984cac36366cd43bc /Documentation/networking/multiqueue.txt
parent5861381d486601430cccf64849bd0a226154bc0d (diff)
downloadlinux-b9c273babce791cf228fc466577f55056a699f9c.tar.xz
PM / arch: x86: MSR_IA32_ENERGY_PERF_BIAS sysfs interface
The Performance and Energy Bias Hint (EPB) is expected to be set by user space through the generic MSR interface, but that interface is not particularly nice and there are security concerns regarding it, so it is not always available. For this reason, add a sysfs interface for reading and updating the EPB, in the form of a new attribute, energy_perf_bias, located under /sys/devices/system/cpu/cpu#/power/ for online CPUs that support the EPB feature. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Acked-by: Borislav Petkov <bp@suse.de>
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