From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Ralf Ramsauer <ralf.ramsauer@oth-regensburg.de>
Cc: Jiri Slaby <jslaby@suse.com>,
linux-serial@vger.kernel.org, jailhouse-dev@googlegroups.com,
Jay Dolan <jay.dolan@accesio.com>
Subject: Re: [PATCH] serial: 8250_pci: Implement MSI(-X) support
Date: Wed, 4 Sep 2019 09:22:06 +0200 [thread overview]
Message-ID: <20190904072206.GA30185@kroah.com> (raw)
In-Reply-To: <740fc1e7-fb3d-c0c7-c17b-2ea3a8864d89@oth-regensburg.de>
On Fri, Aug 30, 2019 at 12:33:09AM +0200, Ralf Ramsauer wrote:
> *ping* :)
>
> On 8/12/19 1:21 PM, Ralf Ramsauer wrote:
> > There may be setups, where legacy interrupts are not available. This is
> > the caese, e.g., when Linux runs as guest (aka. non-root cell) of the
> > partitioning hypervisor Jailhouse. There, only MSI(-X) interrupts are
> > available for guests.
> >
> > But the 8250_pci driver currently only supports legacy ints. So let's
> > enable MSI(-X) interrupts.
> >
> > Nevertheless, this needs to handled with care: while many 8250 devices
> > actually claim to support MSI(-X) interrupts it should not be enabled be
> > default. I had at least one device in my hands with broken MSI
> > implementation.
> >
> > So better introduce a whitelist with devices that are known to support
> > MSI(-X) interrupts. I tested all devices mentioned in the patch.
> >
> > Signed-off-by: Ralf Ramsauer <ralf.ramsauer@oth-regensburg.de>
Ok, will queue this up, let's see what breaks :)
prev parent reply other threads:[~2019-09-04 7:22 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-12 11:21 [PATCH] serial: 8250_pci: Implement MSI(-X) support Ralf Ramsauer
2019-08-29 22:33 ` Ralf Ramsauer
2019-09-04 7:22 ` Greg Kroah-Hartman [this message]
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