linux-kernel - [PATCH v2 0/4] irqchip/gic: Generalize use of HW-based retriggering

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Date:   Thu,  3 Sep 2020 19:32:02 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     Jason Cooper <jason@...edaemon.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Valentin Schneider <valentin.schneider@....com>,
        kernel-team@...roid.com
Subject: [PATCH v2 0/4] irqchip/gic: Generalize use of HW-based retriggering

Valentin recently pointed out that that relying on SW-based retrigger
with any of the GIC interrupt controllers is both inefficient and
slightly broken, as it messes the GIC's own state machine.

For this to work with the hierarchical irqchip model that the GIC
uses, we need check_irq_resend grow an understanding of hierarchies,
something it has been lacking for some time.

The 3 other patches simply implement the HW resend callbacks, and
finally prevent any SW resend for the GICs.

Unless anyone objects, I plan to take this into 5.10.

* From v1:
  - Dropped most of the patches in favour of a teaching the core
    kernel to use irq_chip_retriger_hierarchy()

Marc Zyngier (2):
  genirq: Walk the irq_data hierarchy when resending an interrupt
  irqchip/git-v3-its: Implement irq_retrigger callback for
    device-triggered LPIs

Valentin Schneider (2):
  irqchip/gic-v2, v3: Implement irq_chip->irq_retrigger()
  irqchip/gic-v2, v3: Prevent SW resends entirely

 drivers/irqchip/irq-gic-v3-its.c |  6 ++++++
 drivers/irqchip/irq-gic-v3.c     | 12 +++++++++++-
 drivers/irqchip/irq-gic.c        | 12 +++++++++++-
 kernel/irq/resend.c              | 15 +++++++++++++--
 4 files changed, 41 insertions(+), 4 deletions(-)

-- 
2.28.0