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

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Message-ID: <fxwrkdaipw7sgr34wtgrh2m757xiras6bfaaugcgopuaxe2e5n@3ipw3t5hg5i7>
Date: Tue, 12 Aug 2025 07:15:10 +0800
From: Inochi Amaoto <inochiama@...il.com>
To: Thomas Gleixner <tglx@...utronix.de>, 
	Inochi Amaoto <inochiama@...il.com>, Bjorn Helgaas <bhelgaas@...gle.com>, 
	Marc Zyngier <maz@...nel.org>, Lorenzo Pieralisi <lpieralisi@...nel.org>, 
	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 Tue, Aug 12, 2025 at 06:36:20AM +0800, Inochi Amaoto wrote:
> On Mon, Aug 11, 2025 at 04:33:06PM +0200, Thomas Gleixner wrote:
> > 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.
> > 
> 
> The PCIe controller, in detail, the Synopsys DesignWare PCIe controller.
> I will update the comment.

This is still too short, I mean if the PCIe controller also supports 
this feature, so the MSI controller and the PCIe device driver can
negotiate and then use this feature.

> 
> > > 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.
> > 

Yeah, this does thing I want to describe.

Regards,
Inochi