linux-kernel - Re: [patch 01/33] genirq/msi: Rearrange MSI domain flags

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Message-ID: <Y3UuwHuyT0lq+zvg@nvidia.com>
Date:   Wed, 16 Nov 2022 14:41:04 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.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>,
        Dave Jiang <dave.jiang@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Ashok Raj <ashok.raj@...el.com>, Jon Mason <jdmason@...zu.us>,
        Allen Hubbe <allenbh@...il.com>,
        "Ahmed S. Darwish" <darwi@...utronix.de>,
        Reinette Chatre <reinette.chatre@...el.com>
Subject: Re: [patch 01/33] genirq/msi: Rearrange MSI domain flags

On Fri, Nov 11, 2022 at 02:58:12PM +0100, Thomas Gleixner wrote:
> These flags got added as necessary and have no obvious structure. For
> feature support checks and masking it's convenient to have two blocks of
> flags:
> 
>    1) Flags to control the internal behaviour like allocating/freeing
>       MSI descriptors. Those flags do not need any support from the
>       underlying MSI parent domain. They are mostly under the control
>       of the outermost domain which implements the actual MSI support.
> 
>    2) Flags to expose features, e.g. PCI multi-MSI or requirements
>       which can depend on a underlying domain.
> 
> No functional change.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
>  include/linux/msi.h |   49 ++++++++++++++++++++++++++++++++++---------------
>  1 file changed, 34 insertions(+), 15 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason