linux-kernel - Re: [PATCH v14 11/18] irqchip: Add RISC-V incoming MSI controller early driver

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Date: Fri, 23 Feb 2024 09:28:39 +0100
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-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, Anup Patel
 <apatel@...tanamicro.com>
Subject: Re: [PATCH v14 11/18] irqchip: Add RISC-V incoming MSI controller
 early driver

On Thu, Feb 22 2024 at 15:09, Anup Patel wrote:
> +	/*
> +	 * Setup cpuhp state (must be done after setting imsic_parent_irq)
> +	 *
> +	 * Don't disable per-CPU IMSIC file when CPU goes offline
> +	 * because this affects IPI and the masking/unmasking of
> +	 * virtual IPIs is done via generic IPI-Mux
> +	 */
> +	cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "irqchip/riscv/imsic:starting",
> +			  imsic_starting_cpu, imsic_dying_cpu);

This is not really correct. IPIs should be working right away when a CPU
comes online and on the unplug side until it really goes offline.

So this wants to be in the starting range, i.e. between CPUHP_AP_OFFLINE
and CPUHP_AP_ONLINE. No?

Thanks,

        tglx