linux-kernel - Re: [PATCH 4/4] irqchip/sg2042-msi: Set MSI_FLAG_MULTI_PCI

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Message-ID: <87349y7wt9.ffs@tglx>
Date: Mon, 11 Aug 2025 16:33:06 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Inochi Amaoto <inochiama@...il.com>, Bjorn Helgaas
 <bhelgaas@...gle.com>, Marc Zyngier <maz@...nel.org>, Lorenzo Pieralisi
 <lpieralisi@...nel.org>, Inochi Amaoto <inochiama@...il.com>, Saurabh
 Sengar <ssengar@...ux.microsoft.com>, Shradha Gupta
 <shradhagupta@...ux.microsoft.com>, Jonathan Cameron
 <Jonathan.Cameron@...ei.com>, Nicolin Chen <nicolinc@...dia.com>, Jason
 Gunthorpe <jgg@...pe.ca>, Chen Wang <unicorn_wang@...look.com>
Cc: linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org, Yixun Lan
 <dlan@...too.org>, Longbin Li <looong.bin@...il.com>
Subject: Re: [PATCH 4/4] irqchip/sg2042-msi: Set MSI_FLAG_MULTI_PCI_MSI
 flags for SG2044

On Thu, Aug 07 2025 at 19:23, Inochi Amaoto wrote:

> The MSI controller on SG2044 has the ability to allocate
> multiple PCI MSI interrupt if the controller supports it.

interrupts ...

Which controller?

if the PCI device supports multi MSI.

> Add the missing flag so the controller can make full use
> of it.

Again, the controller does not make use of it. The controller supports
it and the device driver can use it if both the PCI device and the
underlying MSI controller support it.