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** Tags added: verification-needed-cosmic

** Tags added: verification-needed-bionic

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  Add Cavium ThunderX2 SoC UNCORE PMU driver

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Bionic:
  Fix Committed
Status in linux source package in Cosmic:
  Fix Committed
Status in linux source package in Disco:
  Fix Committed

Bug description:
  No driver for PMU of L3 cache controller (L3C) and the DDR4 Memory Controller 
(DMC) for Cavium ThunderX2 SoC

  [Test Case]
  sudo perf stat -a -e \
  > uncore_dmc_0/cnt_cycles/,\
  > uncore_dmc_0/data_transfers/,\
  > uncore_dmc_0/read_txns/,\
  > uncore_dmc_0/write_txns/ sleep 1

  sudo perf stat -a -e \
  > uncore_l3c_0/read_request/,\
  > uncore_l3c_0/read_hit/,\
  > uncore_l3c_0/inv_request/,\
  > uncore_l3c_0/inv_hit/ sleep 1

  sudo perf stat -a -e uncore_dmc_0/cnt_cycles/ sleep 1

  Backport patches
  82975c46da  perf: Export perf_event_update_userpage (only for bionic)
  d6310a3f33  Documentation: perf: Add documentation for ThunderX2 PMU uncore 
  69c32972d5  drivers/perf: Add Cavium ThunderX2 SoC UNCORE PMU driver
  and enable CONFIG_THUNDERX2_PMU=m

  [Regression Risk]
  This driver only loaded when CAV901C in ACPI table, lowest risk for other 

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