[PATCH v3 0/9] arm_pmu: Use NMI for perf interrupt

Julien Thierry julien.thierry at arm.com
Mon Jul 8 07:32:48 PDT 2019


Hi,

After fixing the arm64 Pseudo-NMIs, I'm dusting off this series.

The series makes the arm_pmu driver use NMIs for the perf interrupt when
NMIs are available on the platform (currently, only arm64 + GICv3).

* Patches 1 to 4 remove the need to use spinlocks for the Arm PMU
  driver for Armv7 and Armv8 (aarch64).
* Patches 5 moves the locking to Armv6 specific code which is the sole
  user
* Patches 6 and 7 make the PMU interrupt handler NMI-safe
* Patches 8 and 9 enable using pseudo-NMI for the PMU interrupt when
  the feature is available

Changes since v2[1]:
- Rebased on recent linux-next (next-20190708)
- Fixed a number of bugs with indices (reported by Wei)
- Minor style fixes

Changes since v1[2]:
- Rebased on v5.1-rc1
- Pseudo-NMI has changed a lot since then, use the (now merged) NMI API
- Remove locking from armv7 perf_event
- Use locking only in armv6 perf_event
- Use direct counter/type registers insted of selector register for armv8

[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2019-March/640536.html
[2] http://lists.infradead.org/pipermail/linux-arm-kernel/2018-January/554611.html

Cheers,

Julien

-->

Julien Thierry (8):
  arm64: perf: Remove PMU locking
  arm: perf: save/resore pmsel
  arm: perf: Remove Remove PMU locking
  perf/arm_pmu: Move PMU lock to ARMv6 events
  arm64: perf: Do not call irq_work_run in NMI context
  arm/arm64: kvm: pmu: Make overflow handler NMI safe
  arm_pmu: Introduce pmu_irq_ops
  arm_pmu: Use NMIs for PMU

Mark Rutland (1):
  arm64: perf: avoid PMXEV* indirection

 arch/arm/kernel/perf_event_v6.c |  26 +++++---
 arch/arm/kernel/perf_event_v7.c |  77 +++++++---------------
 arch/arm64/kernel/perf_event.c  | 131 ++++++++++++++++++++++++------------
 drivers/perf/arm_pmu.c          | 143 ++++++++++++++++++++++++++++++++++------
 include/kvm/arm_pmu.h           |   1 +
 include/linux/perf/arm_pmu.h    |   5 --
 virt/kvm/arm/pmu.c              |  25 ++++++-
 7 files changed, 277 insertions(+), 131 deletions(-)

--
1.9.1



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