** Also affects: linux (Ubuntu Cosmic)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Disco)
Importance: Undecided
Assignee: Ike Panhc (ikepanhc)
Status: Incomplete
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1811200
Title:
Add Cavium ThunderX2 SoC UNCORE PMU driver
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Bionic:
New
Status in linux source package in Cosmic:
New
Status in linux source package in Disco:
Incomplete
Bug description:
[Impact]
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
[Fix]
Backport patches
82975c46da perf: Export perf_event_update_userpage (only for bionic)
d6310a3f33 Documentation: perf: Add documentation for ThunderX2 PMU uncore
driver
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
platform.
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