[PATCH 0/3] arm64: perf: Add support for Perf NMI interrupts

[Lecopzer Chen]

These series implement Perf NMI funxtionality and depends on
Pseudo NMI [1] which has been upstreamed.

In arm64 with GICv3, Pseudo NMI was implemented for NMI-like interruts.
That can be extended to Perf NMI which is the prerequisite for hard-lockup
detector which had already a standard interface inside Linux.

Thus the first step we need to implement perf NMI interface and make sure
it works fine.

Perf NMI has been test by dd if=/dev/urandom of=/dev/null like the link [2]
did.

[1] https://lkml.org/lkml/2019/1/31/535
[2] https://www.linaro.org/blog/debugging-arm-kernels-using-nmifiq


Lecopzer Chen (3):
  arm_pmu: Add support for perf NMI interrupts registration
  arm64: perf: Support NMI context for perf event ISR
  arm64: Kconfig: Add support for the Perf NMI

 arch/arm64/Kconfig             | 10 +++++++
 arch/arm64/kernel/perf_event.c | 36 ++++++++++++++++++------
 drivers/perf/arm_pmu.c         | 51 ++++++++++++++++++++++++++++++----
 include/linux/perf/arm_pmu.h   |  6 ++++
 4 files changed, 88 insertions(+), 15 deletions(-)

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2.25.1