[RFC PATCH v1 0/9] Support shared percpu interrupts; clean up MIPS hacks

[Paul Burton <paul.burton@imgtec.com>]

This series introduces support for percpu shared interrupts and makes
use of this support to clean up some hacks that have been used to
support such interrupts on MIPS.

- Patch 1 allows users of shared interrupts to opt into IRQ_NOAUTOEN
  behaviour & avoid warnings from doing so.

- Patch 2 introduces support for shared percpu_devid interrupts.

- Patch 3 introduces a helper allowing users to detect whether an
  interrupt is a percpu_devid interrupt or not, which is useful
  during the transition phase where interrupts may be either.

- Patches 4 & 5 removes an ugly custom implementation of shared
  interrupts between the MIPS cevt-r4k timer driver & users of
  performance counters, in favor of using standard IRQF_SHARED &
  multiple handlers.

- Patches 6 & 7 add percpu interrupt support to the MIPS perf &
  cevt-r4k timer drivers respectively.

- Patch 8 configures the MIPS cop 0 count/compare, fast debug channel &
  performance counter overflow interrupts as percpu_devid when they are
  mapped by the irqchip-mips-cpu driver.

- Patch 9 removes a hack from the irqchip-mips-gic driver that was
  used to enable & disable an interrupt across all CPUs, which is no
  longer necessary with users of those interrupts using the percpu
  interrupt APIs correctly. This mirrors patch 8 for systems where we
  map the CPU local interrupts via the GIC.

There's a little more work necessary before this could go in - the
MIPS oprofile code needs adjusting to use the percpu interrupt APIs, as
does the fast debug channel driver.

Applies atop next-20170905.

Paul Burton (9):
  genirq: Allow shared interrupt users to opt into IRQ_NOAUTOEN
  genirq: Support shared per_cpu_devid interrupts
  genirq: Introduce irq_is_percpu_devid()
  MIPS: Remove perf_irq interrupt sharing fallback
  MIPS: Remove perf_irq
  MIPS: perf: percpu_devid interrupt support
  MIPS: cevt-r4k: percpu_devid interrupt support
  irqchip: mips-cpu: Set timer, FDC & perf interrupts percpu_devid
  irqchip: mips-gic: Remove gic_all_vpes_local_irq_controller

 arch/mips/include/asm/time.h            |  1 -
 arch/mips/kernel/cevt-r4k.c             | 77 ++++++++++++-----------------
 arch/mips/kernel/perf_event_mipsxx.c    | 71 +++++++++++----------------
 arch/mips/kernel/time.c                 |  9 ----
 arch/mips/kernel/traps.c                |  2 +-
 arch/mips/oprofile/op_impl.h            |  2 -
 arch/mips/oprofile/op_model_loongson3.c | 39 +++++++--------
 arch/mips/oprofile/op_model_mipsxx.c    | 10 +---
 drivers/irqchip/irq-mips-cpu.c          |  9 +++-
 drivers/irqchip/irq-mips-gic.c          | 69 +++-----------------------
 include/linux/interrupt.h               |  2 +
 include/linux/irqdesc.h                 |  8 +++
 kernel/irq/chip.c                       |  8 +--
 kernel/irq/handle.c                     |  8 ++-
 kernel/irq/manage.c                     | 86 +++++++++++++++++++++++++--------
 kernel/irq/settings.h                   |  5 ++
 16 files changed, 189 insertions(+), 217 deletions(-)

-- 
2.14.1