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

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Message-ID: <20171006075700.587a5e22@xeon-e3>
Date:   Fri, 6 Oct 2017 07:57:00 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     "Stahl, Manuel" <manuel.stahl@...-extern.fraunhofer.de>
Cc:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        "hjk@...utronix.de" <hjk@...utronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "sojkam1@....cvut.cz" <sojkam1@....cvut.cz>
Subject: Re: [PATCH 2/2] uio: Prefer MSI(X) interrupts in PCI drivers

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.