linux-kernel - Re: [PATCH 2/2] uio: Prefer MSI(X) interrupts in PCI drivers

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Message-ID: <9ba3cdd6d330486a91cb5c376f012b5b963c4eae.camel@iis-extern.fraunhofer.de>
Date:   Wed, 4 Mar 2020 15:19:55 +0000
From:   "Stahl, Manuel" <manuel.stahl@...-extern.fraunhofer.de>
To:     "stephen@...workplumber.org" <stephen@...workplumber.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:     "hjk@...utronix.de" <hjk@...utronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        "sojkam1@....cvut.cz" <sojkam1@....cvut.cz>
Subject: Re: [PATCH 2/2] uio: Prefer MSI(X) interrupts in PCI drivers

Hi Greg,

so somehow this discussion stopped without any instructions how to proceed.
I think this kind of driver helps every FPGA developer to interface his design via PCIe to a Linux PC.
So if there is any chance to get this code merged, I'm glad to rebase this onto the latest kernel release.

Best regards,
Manuel Stahl

On Fr, 2017-10-20 at 14:58 +0200, Manuel Stahl wrote:
> Hi Greg,
> 
> it just uses MSI-X or MSI when available and falls back to legacy IRQ otherwise.
> 
> Regards,
> Manuel
> 
> On Fr, 2017-10-20 at 14:50 +0200, gregkh@...uxfoundation.org wrote:
> > On Fri, Oct 06, 2017 at 07:57:00AM -0700, Stephen Hemminger wrote:
> > > On Fri, 6 Oct 2017 13:50:44 +0000
> > > "Stahl, Manuel" <manuel.stahl@...-extern.fraunhofer.de> wrote:
> > > 
> > > > MSI(X) interrupts are not shared between devices. So when available
> > > > those should be preferred over legacy interrupts.
> > > > 
> > > > Signed-off-by: Manuel Stahl <manuel.stahl@....fraunhofer.de>
> > > > ---
> > > >  drivers/uio/uio_pci_dmem_genirq.c | 27 ++++++++++++++++++++-------
> > > >  drivers/uio/uio_pci_generic.c     | 24 ++++++++++++++++++------
> > > >  2 files changed, 38 insertions(+), 13 deletions(-)
> > > 
> > > The last time I tried to do MSI-X with pci-generic it got rejected
> > > by the maintainer.
> > 
> > Hm, yeah, this would break users today that do not have msi-x, right?
> > 
> > Not good, Manuel, how well did you test this?
> > 
> > thanks,
> > 
> > greg k-h