This series implements tests exercising the PMUv3 event counters.
It tests both the 32-bit and 64-bit versions. Overflow interrupts
also are checked. Those tests only are written for arm64.
It allowed to reveal some issues related to SW_INCR implementation
(esp. related to 64-bit implementation), some problems related to
32-bit <-> 64-bit transitions and consistency of enabled states
of odd and event counters (See [1]).
Overflow interrupt testing relies of one patch from Andre
("arm: gic: Provide per-IRQ helper functions") to enable the
PPI 23, coming from "arm: gic: Test SPIs and interrupt groups"
(https://patchwork.kernel.org/cover/11234975/). Drew kindly
provided "arm64: Provide read/write_sysreg_s".
All PMU tests can be launched with:
./run_tests.sh -g pmu
Tests also can be launched individually. For example:
./arm-run arm/pmu.flat -append 'chained-sw-incr'
With KVM:
- chain-promotion and chained-sw-incr are known to be failing.
[1] proposed a fix.
- On TX2, I have some random failures due to MEM_ACCESS event
measured with a great disparity. This is not observed on
other machines I have access to.
With TCG:
- all new tests are skipped
The series can be found at:
https://github.com/eauger/kut/tree/pmu_event_counters_v2
References:
[1] [PATCH 0/4] KVM/ARM: Misc PMU fixes
(https://www.spinics.net/lists/kvm-arm/msg38886.html)
History:
- Took into account Andre's comments except I did not
use cnbz in the mem_access_loop() and I did not use
@loop directly. Those changes had side effects I
cannot explain on the tests. Anyway I think this can
be improved later on.
- removed [kvm-unit-tests PATCH 09/10] arm/arm64: gic:
Introduce setup_irq() helper
RFC -> v1:
- Use new report() proto
- Style cleanup
- do not warn about ARM spec recommendations
- add a comment about PMCEID0/1 splits
Andre Przywara (1):
arm: gic: Provide per-IRQ helper functions
Andrew Jones (1):
arm64: Provide read/write_sysreg_s
Eric Auger (7):
arm: pmu: Let pmu tests take a sub-test parameter
arm: pmu: Add a pmu struct
arm: pmu: Check Required Event Support
arm: pmu: Basic event counter Tests
arm: pmu: Test chained counter
arm: pmu: test 32-bit <-> 64-bit transitions
arm: pmu: Test overflow interrupts
arm/pmu.c | 786 ++++++++++++++++++++++++++++++++++++++++-
arm/unittests.cfg | 55 ++-
lib/arm/asm/gic-v3.h | 2 +
lib/arm/asm/gic.h | 9 +
lib/arm/gic.c | 90 +++++
lib/arm64/asm/sysreg.h | 11 +
6 files changed, 936 insertions(+), 17 deletions(-)
--
2.20.1
