The MBM (Memory Bandwidth Monitoring) and MBA (Memory Bandwidth Allocation)
features are not enabled for AMD systems. The reason was lack of perf
counters to compare the resctrl test results.
Starting with the commit
25e56847821f ("perf/x86/amd/uncore: Add memory controller support"), AMD
now supports the UMC (Unified Memory Controller) perf events. These events
can be used to compare the test results.
This series adds the support to detect the UMC events and enable MBM/MBA
tests for AMD systems.
v3:
Note: Based the series on top of latest kselftests/master
1613e604df0cd359cf2a7fbd9be7a0bcfacfabd0 (tag: v6.10-rc1).
Also applied the patches from the series
https://lore.kernel.org/lkml/20240531131142.1716-1-ilpo.jarvinen@xxxxxxxxxxxxxxx/
Separated the fix patch.
Renamed the imc to just mc to make it generic.
Changed the search string "uncore_imc_" and "amd_umc_"
Changes related rebase to latest kselftest tree.
v2: Changes.
a. Rebased on top of tip/master (Apr 25, 2024)
b. Addressed Ilpo comments except the one about close call.
It seems more clear to keep READ and WRITE separate.
https://lore.kernel.org/lkml/8e4badb7-6cc5-61f1-e041-d902209a90d5@xxxxxxxxxxxxxxx/
c. Used ksft_perror call when applicable.
d. Added vendor check for non contiguous CBM check.
v1: https://lore.kernel.org/lkml/cover.1708637563.git.babu.moger@xxxxxxx/
Babu Moger (4):
selftests/resctrl: Rename variables and functions to generic names
selftests/resctrl: Pass sysfs controller name of the vendor
selftests/resctrl: Add support for MBM and MBA tests on AMD
selftests/resctrl: Enable MBA/MBA tests on AMD
tools/testing/selftests/resctrl/mba_test.c | 25 +-
tools/testing/selftests/resctrl/mbm_test.c | 23 +-
tools/testing/selftests/resctrl/resctrl.h | 2 +-
tools/testing/selftests/resctrl/resctrl_val.c | 305 ++++++++++--------
tools/testing/selftests/resctrl/resctrlfs.c | 2 +-
5 files changed, 191 insertions(+), 166 deletions(-)
--
2.34.1
