This is a component that exports power information for Intel Xeon Phi cards (MIC).
The component makes use of the MicAccessAPI distributed with the Intel Manycore Platform Software Stack.
(http://software.intel.com/en-us/articles/intel-manycore-platform-software-stack-mpss)
Specifically in the intel-mic-sysmgmt package.

A configure script allows for non-default locations for the sysmgmt sdk. see ./configure --help

About the data, PAPI retrieves the data via the MicGetPowerUsage call.
Per the SDK documentation:
MicGetPowerUsage - Retrieve power usage values of Intel® Xeon Phi™ Coprocessor and components.
   Data Fields
   MicPwrPws  total0
              Total power utilization by Intel® Xeon Phi™ product codenamed “Knights Corner” device, Averaged over Time Window 0 (uWatts).
   MicPwrPws  total1
              Total power utilization by Intel® Xeon Phi™ product codenamed “Knights Corner” device, Averaged over Time Window 1 (uWatts).
   MicPwrPws  inst
              Instantaneous power (uWatts).
   MicPwrPws  imax
              Max instantaneous power (uWatts).
   MicPwrPws  pcie
              PCI-E connector power (uWatts).
   MicPwrPws  c2x3
              2x3 connector power (uWatts).
   MicPwrPws  c2x4
              2x4 connector power (uWatts).
   MicPwrVrr  vccp
              Core rail (uVolts).
   MicPwrVrr  vddg
              Uncore rail (uVolts).
   MicPwrVrr  vddq
              Memory subsystem rail (uVolts).