linux-kernel - Re: [PATCH v13 08/13] irqchip/riscv-imsic: Add device MSI domain support for PCI devices

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Date: Tue, 20 Feb 2024 21:03:43 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Anup Patel <apatel@...tanamicro.com>
Cc: 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>, 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
Subject: Re: [PATCH v13 08/13] irqchip/riscv-imsic: Add device MSI domain
 support for PCI devices

On Tue, Feb 20 2024 at 22:51, Anup Patel wrote:

> On Tue, Feb 20, 2024 at 7:05 PM Thomas Gleixner <tglx@...utronix.de> wrote:
>>
>> On Tue, Feb 20 2024 at 11:37, Anup Patel wrote:
>> >  static bool imsic_init_dev_msi_info(struct device *dev,
>> >                                   struct irq_domain *domain,
>> >                                   struct irq_domain *real_parent,
>> > @@ -218,6 +241,7 @@ static bool imsic_init_dev_msi_info(struct device *dev,
>> >
>> >       /* MSI parent domain specific settings */
>> >       switch (real_parent->bus_token) {
>> > +     case DOMAIN_BUS_PCI_MSI:
>>
>>         case DOMAIN_BUS_PCI_DEVICE_MSIX:
>>
>> ?
>
> Actually, the DOMAIN_BUS_PCI_MSI is not needed because
> the real parent domain is always the IMSIC base irq_domain
> so DOMAIN_BUS_NEXUS is sufficient.

Indeed. Obviously I can't read.

> Better to just drop DOMAIN_BUS_PCI_MSI from this switch case ?

Yes. I actually would be a bug if that ends up as the real parent
domain.

Thanks,

       tglx