arm64: enable perf events based hard lockup detector

With the recent feature added to enable perf events to use pseudo NMIs as
interrupts on platforms which support GICv3 or later, its now been
possible to enable hard lockup detector (or NMI watchdog) on arm64
platforms.  So enable corresponding support.

One thing to note here is that normally lockup detector is initialized
just after the early initcalls but PMU on arm64 comes up much later as
device_initcall().  To cope with that, override
arch_perf_nmi_is_available() to let the watchdog framework know PMU not
ready, and inform the framework to re-initialize lockup detection once PMU
has been initialized.

[[email protected]: only HAVE_HARDLOCKUP_DETECTOR_PERF if the PMU config is enabled]
  Link: https://lkml.kernel.org/r/20230523073952.1.I60217a63acc35621e13f10be16c0cd7c363caf8c@changeid
Link: https://lkml.kernel.org/r/20230519101840.v5.18.Ia44852044cdcb074f387e80df6b45e892965d4a1@changeid
Co-developed-by: Sumit Garg <[email protected]>
Signed-off-by: Sumit Garg <[email protected]>
Co-developed-by: Pingfan Liu <[email protected]>
Signed-off-by: Pingfan Liu <[email protected]>
Signed-off-by: Lecopzer Chen <[email protected]>
Signed-off-by: Douglas Anderson <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Chen-Yu Tsai <[email protected]>
Cc: Christophe Leroy <[email protected]>
Cc: Colin Cross <[email protected]>
Cc: Daniel Thompson <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Guenter Roeck <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Masayoshi Mizuma <[email protected]>
Cc: Matthias Kaehlcke <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Nicholas Piggin <[email protected]>
Cc: Petr Mladek <[email protected]>
Cc: Randy Dunlap <[email protected]>
Cc: "Ravi V. Shankar" <[email protected]>
Cc: Ricardo Neri <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Stephen Boyd <[email protected]>
Cc: Tzung-Bi Shih <[email protected]>
Cc: Will Deacon <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions