linux-kernel - Re: [PATCH 1/3] PCI: endpoint: Add RC-to-EP doorbell support using platform MSI controller

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Message-ID: <ZPiT/LJGpNbCRDZk@lizhi-Precision-Tower-5810>
Date:   Wed, 6 Sep 2023 11:00:12 -0400
From:   Frank Li <Frank.li@....com>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     tglx@...utronix.de, aisheng.dong@....com, bhelgaas@...gle.com,
        devicetree@...r.kernel.org, festevam@...il.com,
        imx@...ts.linux.dev, jdmason@...zu.us, kernel@...gutronix.de,
        kishon@...com, krzysztof.kozlowski+dt@...aro.org, kw@...ux.com,
        linux-arm-kernel@...ts.infradead.org, linux-imx@....com,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        lorenzo.pieralisi@....com, lpieralisi@...nel.org, maz@...nel.org,
        ntb@...ts.linux.dev, peng.fan@....com, robh+dt@...nel.org,
        s.hauer@...gutronix.de, shawnguo@...nel.org
Subject: Re: [PATCH 1/3] PCI: endpoint: Add RC-to-EP doorbell support using
 platform MSI controller

On Wed, Sep 06, 2023 at 08:22:27PM +0530, Manivannan Sadhasivam wrote:
> > > 
> > > Can't you assign it in the EPF driver itself? I do not want any OF reference in
> > > the EPF core since it has no OF support.
> > 
> > If that, Each EPF driver need do duplicate work. 
> > 
> 
> Yes, and that's how it should be. EPF core has no job in supplying the of_node.
> It is the responsibility of the EPF drivers as they depend on OF for platform
> support.

EPF driver still not depend on OF. such pci-epf-test, which was probed by
configfs.

Frank 

> 
> - Mani
> 
> > IMS will support per-device MSI domain, then we can implement customized
> > MSI irq allocated. But so far, it is simplest solution, we can update it
> > after IMS implementation at kernel. Only one place need be changed.
> > 
> மணிவண்ணன் சதாசிவம்