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    • Dirk Brandewie's avatar
      intel_pstate: Add support for HWP · 2f86dc4c
      Dirk Brandewie authored
      
      Add support of Hardware Managed Performance States (HWP) described in Volume 3
      section 14.4 of the SDM.
      
      With HWP enbaled intel_pstate will no longer be responsible for selecting P
      states for the processor. intel_pstate will continue to register to
      the cpufreq core as the scaling driver for CPUs implementing
      HWP. In HWP mode intel_pstate provides three functions reporting
      frequency to the cpufreq core, support for the set_policy() interface
      from the core and maintaining the intel_pstate sysfs interface in
      /sys/devices/system/cpu/intel_pstate.  User preferences expressed via
      the set_policy() interface or the sysfs interface are forwared to the
      CPU via the HWP MSR interface.
      
      Signed-off-by: default avatarDirk Brandewie <dirk.j.brandewie@intel.com>
      Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      2f86dc4c
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