linux-kernel - Re: [PATCH v12 00/25] Linux RISC-V AIA Support

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Message-ID: <CAK9=C2VLf96D8cm86D26=hJMsqehUM5x_=Cjyy+7kVcAZ5KrUQ@mail.gmail.com>
Date: Wed, 7 Feb 2024 18:40:40 +0530
From: Anup Patel <apatel@...tanamicro.com>
To: Björn Töpel <bjorn@...nel.org>
Cc: Anup Patel <anup@...infault.org>, Palmer Dabbelt <palmer@...belt.com>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Thomas Gleixner <tglx@...utronix.de>, 
	Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Frank Rowand <frowand.list@...il.com>, 
	Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org, 
	Saravana Kannan <saravanak@...gle.com>, Marc Zyngier <maz@...nel.org>, linux-kernel@...r.kernel.org, 
	Atish Patra <atishp@...shpatra.org>, linux-riscv@...ts.infradead.org, 
	linux-arm-kernel@...ts.infradead.org, Andrew Jones <ajones@...tanamicro.com>
Subject: Re: [PATCH v12 00/25] Linux RISC-V AIA Support

On Wed, Feb 7, 2024 at 6:25 PM Björn Töpel <bjorn@...nel.org> wrote:
>
> Björn Töpel <bjorn@...nel.org> writes:
>
> >>> Hmm, seems like we're talking past each other, or at least I get the
> >>> feeling I can't get my opinions out right. I'll try to do a quick PoC,
> >>> to show you what I mean. That's probably easier than just talking about
> >>> it. ...and maybe I'll come realizing I'm all wrong!
> >>
> >> I suggest to wait for my v13 and try something on top of that
> >> otherwise we might duplicate efforts.
> >
> > OK!
>
> I did some really rough code sketching, and I'm confident that you can
> get rid of all ids_enabled_bitmap, hwirqs_used_bitmap, and the
> corresponding functions/locks. I'd say one lock is enough, and the key
> is having the per-cpu imsic_local_priv.vectors change from struct
> imsic_vector * to struct imsic_vector **.
>
> Using smp_call_function_single() to IPI enable (and disable if you don't
> want to use the lazy timer disable mechanism) seems feasible as well!
>
> (Let me know if you don't have the spare cycles, and I can help out.)

If you can help upstream IOMMU driver then that would be awesome.

Regards,
Anup