linux-kernel - Re: [PATCH v3 4/7] xen/pciback: Implement PCI reset slot or bus with 'do

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Message-ID: <20140708184626.GA15548@laptop.dumpdata.com>
Date:	Tue, 8 Jul 2014 14:46:26 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	David Vrabel <david.vrabel@...rix.com>
Cc:	konrad@...nel.org, xen-devel@...ts.xenproject.org,
	boris.ostrovsky@...cle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/7] xen/pciback: Implement PCI reset slot or bus with
 'do_flr' SysFS attribute

On Tue, Jul 08, 2014 at 07:02:51PM +0100, David Vrabel wrote:
> On 08/07/14 19:58, konrad@...nel.org wrote:
> > --- a/Documentation/ABI/testing/sysfs-driver-pciback
> > +++ b/Documentation/ABI/testing/sysfs-driver-pciback
> > @@ -82,3 +82,14 @@ Description:
> >                  device is shared, enabled, or on a level interrupt line.
> >                  Writing a string of DDDD:BB:DD.F will toggle the state.
> >                  This is Domain:Bus:Device.Function where domain is optional.
> > +
> > +What:           /sys/bus/pci/drivers/pciback/do_flr
> > +Date:           July 2014
> > +KernelVersion:  3.16
> > +Contact:        xen-devel@...ts.xenproject.org
> > +Description:
> > +                An option to slot or bus reset an PCI device owned by
> > +                Xen PCI backend. Writing a string of DDDD:BB:DD.F will cause
> > +                the driver to perform an slot or bus reset if the device
> > +                supports. It also checks to make sure that all of the devices
> > +                under the bridge are owned by Xen PCI backend.
> 
> Not sure I like this new interface.  I solved this by adding a new reset
> file that looked like the regular one the pci would have if it supported
> FLR.  I'm fairly sure I posted a series for this.  Was there a reason
> you didn't do this?

It did not work.

During bootup kobject would complain about a secondary 'reset' SysFS
on the PCI device.

> 
> David
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