linux-kernel - RE: [patch V2 03/33] genirq/msi: Provide data structs for per device domains

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Date:   Wed, 23 Nov 2022 07:57:49 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
CC:     "x86@...nel.org" <x86@...nel.org>, Joerg Roedel <joro@...tes.org>,
        "Will Deacon" <will@...nel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Lorenzo Pieralisi" <lorenzo.pieralisi@....com>,
        Marc Zyngier <maz@...nel.org>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        Jason Gunthorpe <jgg@...lanox.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        "Raj, Ashok" <ashok.raj@...el.com>, Jon Mason <jdmason@...zu.us>,
        Allen Hubbe <allenbh@...il.com>
Subject: RE: [patch V2 03/33] genirq/msi: Provide data structs for per device
 domains

> From: Thomas Gleixner <tglx@...utronix.de>
> Sent: Monday, November 21, 2022 10:38 PM
> 
> Provide struct msi_domain_template which contains a bundle of struct
> irq_chip, struct msi_domain_ops and struct msi_domain_info and a name
> field.
> 
> This template is used by MSI device domain implementations to provide the
> domain specific functionality, feature bits etc.
> 
> When a MSI domain is created the template is duplicated in the core code
> so that it can be modified per instance. That means templates can be
> marked const at the MSI device domain code.
> 
> The template is a bundle to avoid several allocations and duplications
> of the involved structures.
> 
> The name field is used to construct the final domain and chip name via:
> 
>     $PREFIX-$NAME-$DEVNAME

$PREFIX$NAME-$DEVNAME