linux-kernel - Re: [patch V2 19/36] PCI/MSI: Store properties in device::msi::data

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Message-ID: <87k0gdzmu6.ffs@tglx>
Date:   Thu, 09 Dec 2021 18:53:37 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Jason Gunthorpe <jgg@...dia.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Marc Zygnier <maz@...nel.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Megha Dey <megha.dey@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, linux-pci@...r.kernel.org,
        Cedric Le Goater <clg@...d.org>,
        xen-devel@...ts.xenproject.org, Juergen Gross <jgross@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Will Deacon <will@...nel.org>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        iommu@...ts.linux-foundation.org, dmaengine@...r.kernel.org,
        Stuart Yoder <stuyoder@...il.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Nishanth Menon <nm@...com>, Tero Kristo <kristo@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Vinod Koul <vkoul@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Robin Murphy <robin.murphy@....com>,
        Sinan Kaya <okaya@...nel.org>
Subject: Re: [patch V2 19/36] PCI/MSI: Store properties in device::msi::data

On Wed, Dec 08 2021 at 11:58, Jason Gunthorpe wrote:
> On Mon, Dec 06, 2021 at 11:39:26PM +0100, Thomas Gleixner wrote:
>> Store the properties which are interesting for various places so the MSI
>> descriptor fiddling can be removed.
>> 
>> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
>> ---
>> V2: Use the setter function
>> ---
>>  drivers/pci/msi/msi.c |    8 ++++++++
>>  1 file changed, 8 insertions(+)
>
> I took more time to look at this, to summarize my remarks on the other
> patches
>
> I think we don't need properties. The info in the msi_desc can come
> from the pci_dev which we have easy access to. This seems overall
> clearer

I fixed that now.

> The notable one is the sysfs, but that is probably better handled by
> storing a
>
>   const char *sysfs_label
>
> in the dev->msi and emitting that instead of computing it.

I just compute is for now via is_pci_dev() and
to_pci_dev()->msi_enabled.

We are still debating to remove the whole thing completely.

Thanks,

        tglx