linux-kernel - [PATCH 00/12] genirq/irqchip: Effective affinity fixups

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Date:   Tue, 15 Aug 2017 12:34:35 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Wei Xu <xuwei5@...ilicon.com>,
        James Hogan <james.hogan@...tec.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...e-electrons.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Kevin Cernekee <cernekee@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        Paul Burton <paul.burton@...tec.com>,
        Matt Redfearn <matt.redfearn@...tec.com>
Subject: [PATCH 00/12] genirq/irqchip: Effective affinity fixups

4.13 contains a number of updates to the core IRQ code to deal with
things like the effective affinity. This series attempts to fix a
number of small things that are now breaking:

1) The core code assumes that CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
   being defined implies that *all* interrupts have an effective
   affinity, while it may not be the case (I may have compiled in an
   irqchip driver that has this property, yet none of my interrupts are
   routed through it).

2) A large number of our irqchips are effectively single target (they
   will pick one CPU in the affinity list), and yet do not update the
   effective affinity cpumask.

(1) is solved by checking that the interrupt has been configured as
"single target" when reporting the effective affinity mask.

(2) is just a matter of updating the effective affinity when required,
and to mark the interrupts as "single target". I've kept them separate
so that people can directly pick the irqchip they are interested in,
but these 10 patches could as well be squashed into a single one.

I've lightly tested the ARM GIC stuff, and that's it. I'd appreciate
some feedback from the platform maintainers, specially for the more
exotic architectures such as metag and xtensa.

Thanks,

	M.

Marc Zyngier (12):
  genirq: Restrict effective affinity to single-target interrupts
  genirq/proc: Use the the accessor to report the effective affinity
  irqchip/gic: Report that effective affinity is a single target
  irqchip/gic-v3: Report that effective affinity is a single target
  irqchip/gic-v3-its: Report that effective affinity is a single target
  irqchip/armada-370-xp: Report that effective affinity is a single
    target
  irqchip/bcm-6345-l1: Report that effective affinity is a single target
  irqchip/bcm-7038-l1: Report that effective affinity is a single target
  irqchip/metag-ext: Report that effective affinity is a single target
  irqchip/hip04: Report that effective affinity is a single target
  irqchip/mips-gic: Report that effective affinity is a single target
  irqchip/xtensa-mx: Report that effective affinity is a single target

 arch/arm/mach-hisi/Kconfig          | 1 +
 arch/metag/Kconfig                  | 1 +
 drivers/irqchip/Kconfig             | 7 +++++++
 drivers/irqchip/irq-armada-370-xp.c | 3 +++
 drivers/irqchip/irq-bcm6345-l1.c    | 3 +++
 drivers/irqchip/irq-bcm7038-l1.c    | 3 +++
 drivers/irqchip/irq-gic-v3-its.c    | 7 ++++++-
 drivers/irqchip/irq-gic-v3.c        | 3 +++
 drivers/irqchip/irq-gic.c           | 3 +++
 drivers/irqchip/irq-hip04.c         | 3 +++
 drivers/irqchip/irq-metag-ext.c     | 4 ++++
 drivers/irqchip/irq-mips-gic.c      | 2 ++
 drivers/irqchip/irq-xtensa-mx.c     | 6 +++++-
 include/linux/irq.h                 | 5 ++++-
 kernel/irq/proc.c                   | 2 +-
 15 files changed, 49 insertions(+), 4 deletions(-)

-- 
2.11.0