irqchip/gic-v3: Relax polling of GIC{R,D}_CTLR.RWP

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Recent work on the KVM GIC emulation has revealed that the GICv3
driver is a bit RWP-happy, as it polls this bit for each and
every write MMIO access involving a single interrupt.

As it turns out, polling RWP is only required when:
- Disabling an SGI, PPI or SPI
- Disabling LPIs at the redistributor level
- Disabling groups
- Enabling ARE
- Dealing with DPG*

Simplify the driver by removing all the other instances of RWP
polling, and add the one that was missing when enabling the distributor
(as that's where we set ARE).

Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220405183857.205960-4-maz@kernel.org

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Marc Zyngier 2022-04-05 19:38:57 +01:00

parent a837ed362e

commit 63f13483f0

1 changed files with 18 additions and 20 deletions

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drivers/irqchip/irq-gic-v3.c

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