linux-kernel - [PATCH 0/3] genirq: oneshot-safe threaded EOIs

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Message-Id: <20221126234134.32660-1-samuel@sholland.org>
Date:   Sat, 26 Nov 2022 17:41:31 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Marc Zyngier <maz@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Palmer Dabbelt <palmer@...belt.com>
Cc:     linux-riscv@...ts.infradead.org,
        Samuel Holland <samuel@...lland.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/3] genirq: oneshot-safe threaded EOIs

This is the optimization that I promised back in
https://lore.kernel.org/lkml/20220701202440.59059-1-samuel@sholland.org/
and got back around to cleaning up. To quote that cover letter:

"A further optimization is to take advantage of the fact that multiple
IRQs can be claimed at once. This allows removing the mask operations
for oneshot IRQs -- i.e. the combination of IRQCHIP_ONESHOT_SAFE and
IRQCHIP_EOI_THREADED, which is not currently supported."

Or in other words, we reuse the oneshot infrastructure for EOIs instead
of masking.

There a a few functions/variables that probably should be renamed now
that I have muddied what "oneshot" means. I elected not to do that in
this version to avoid distracting from the functional changes.

Samuel Holland (3):
  genirq: Simplify cond_unmask_eoi_irq()
  genirq: Add support for oneshot-safe threaded EOIs
  irqchip/sifive-plic: Enable oneshot-safe threaded EOIs

 drivers/irqchip/irq-sifive-plic.c |  2 ++
 kernel/irq/chip.c                 | 21 ++++++++++++---------
 kernel/irq/manage.c               | 15 ++++++++++-----
 3 files changed, 24 insertions(+), 14 deletions(-)

-- 
2.37.4