tree af621e8bd5a05f776d9ca90d9e5074cd2b13c372
parent ff0b0d6e1a7bc202241a9b1e28d1da4b744e0312
author Nicholas Piggin <npiggin@gmail.com> 1632322489 +1000
committer Michael Ellerman <mpe@ellerman.id.au> 1639650705 +1100

powerpc/64s/perf: add power_pmu_wants_prompt_pmi to say whether perf wants PMIs to be soft-NMI

Interrupt code enables MSR[EE] in some irq handlers while keeping local
irqs disabled via soft-mask, allowing PMI interrupts to be taken as
soft-NMI to improve profiling of irq handlers.

When perf is not enabled, there is no point to doing this, it's
additional overhead. So provide a function that can say if PMIs should
be taken promptly if possible.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210922145452.352571-4-npiggin@gmail.com