KVM: arm64: PMUv3 Event Counter Tests

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. Fixes now are upstream.

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 'pmu-chained-sw-incr'

With KVM:
- 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.

The series can be found at:
https://github.com/eauger/kut/tree/pmu_event_counters_v4

History:
v3 -> v4:
- Drew reported that some report messages were repeated. This version makes sure all messages are different.

v2 -> v3:
- Took into account numerous comments from Drew
- Applied Andre's R-b when code has not changed too much
- Don't check PMCR.IMP anymore
- better handling of version
- put simple SW_INCR tests for easier TCG testing

v1 -> v2:
- 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

Andrew Jones (1):
arm64: Provide read/write_sysreg_s

Eric Auger (11):
arm: pmu: Let pmu tests take a sub-test parameter
arm: pmu: Don't check PMCR.IMP anymore
arm: pmu: Add a pmu struct
arm: pmu: Introduce defines for PMU versions
arm: pmu: Check Required Event Support
arm: pmu: Basic event counter Tests
arm: pmu: Test SW_INCR event count
arm: pmu: Test chained counters
arm: pmu: test 32-bit <-> 64-bit transitions
arm: gic: Introduce gic_irq_set_clr_enable() helper
arm: pmu: Test overflow interrupts

 arm/pmu.c              | 838 +++++++++++++++++++++++++++++++++++++++--
 arm/unittests.cfg      |  61 ++-
 lib/arm/asm/gic.h      |   4 +
 lib/arm/gic.c          |  31 ++
 lib/arm64/asm/sysreg.h |  17 +
 lib/bitops.h           |   3 +
 6 files changed, 917 insertions(+), 37 deletions(-)

2.20.1