linux-kernel - Re: [PATCH v11 08/14] irqchip/riscv-imsic: Add support for platform MSI irqdomain

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Message-ID: <87edhi5vcw.ffs@tglx>
Date:   Wed, 25 Oct 2023 21:56:47 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Anup Patel <apatel@...tanamicro.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        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>
Cc:     Marc Zyngier <maz@...nel.org>,
        Björn Töpel <bjorn@...nel.org>,
        Atish Patra <atishp@...shpatra.org>,
        Andrew Jones <ajones@...tanamicro.com>,
        Sunil V L <sunilvl@...tanamicro.com>,
        Saravana Kannan <saravanak@...gle.com>,
        Anup Patel <anup@...infault.org>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Anup Patel <apatel@...tanamicro.com>
Subject: Re: [PATCH v11 08/14] irqchip/riscv-imsic: Add support for platform
 MSI irqdomain

On Mon, Oct 23 2023 at 22:57, Anup Patel wrote:
> The Linux platform MSI support requires a platform MSI irqdomain so
> let us add a platform irqchip driver for RISC-V IMSIC which provides
> a base IRQ domain and platform MSI domain. This driver assumes that
> the IMSIC state is already initialized by the IMSIC early driver.

Please no. The platform MSI cruft is really a horrible concept and there
is ongoing work (sadly mightily delayed) to convert the main (ab)user
ARM over to per device MSI domains.

  https://lore.kernel.org/r/20221121135653.208611233@linutronix.de