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While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1811200
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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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
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
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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