Re: [PATCH v16 0/9] RISC-V IPI Improvements

From: Palmer Dabbelt
Date: Tue Feb 14 2023 - 22:17:18 EST


On Sun, 05 Feb 2023 03:04:14 PST (-0800), Marc Zyngier wrote:
On Tue, 03 Jan 2023 14:12:12 +0000,
Anup Patel <apatel@xxxxxxxxxxxxxxxx> wrote:

This series aims to improve IPI support in Linux RISC-V in following ways:
1) Treat IPIs as normal per-CPU interrupts instead of having custom RISC-V
specific hooks. This also makes Linux RISC-V IPI support aligned with
other architectures.
2) Remote TLB flushes and icache flushes should prefer local IPIs instead
of SBI calls whenever we have specialized hardware (such as RISC-V AIA
IMSIC and RISC-V SWI) which allows S-mode software to directly inject
IPIs without any assistance from M-mode runtime firmware.

[...]

I'm queuing patches 3 and 9 via the irqchip tree as they are
standalone.

For the rest, I need an Ack from the riscv maintainers as they change
a large amount of arch-specific code, and the couple of irqchip
patches depend on these changes.

Palmer, Paul?

I haven't gotten time to give this a proper review, but I think we've got enough of a mess with our interrupt handling that it doesn't really matter so

Acked-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>

if you want to take it for this cycle that's fine with me, but I'm also fine holding off so it can have a while to bake in linux-next -- there's no real rush for any of this, as there's no hardware yet.


Thanks,

M.