linux-kernel - Re: [Xen-devel] [PATCH] Xen/pciback: Implement PCI slot or bus reset with 'do

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Date:   Thu, 30 Nov 2017 01:29:57 -0700
From:   "Jan Beulich" <JBeulich@...e.com>
To:     "Govinda Tatti" <govinda.tatti@...cle.com>
Cc:     <xen-devel@...ts.xenproject.org>,
        "Boris Ostrovsky" <boris.ostrovsky@...cle.com>,
        "Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>,
        "Juergen Gross" <jgross@...e.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH] Xen/pciback: Implement PCI slot or bus
 reset with 'do_flr' SysFS attribute

>>> On 29.11.17 at 20:44, <govinda.tatti@...cle.com> wrote:
> So, we will use the following sequence to reset the requested 
> device/function.
> 
> - FLR (as first option)
> - BUS/SLOT reset (as fall-back option) if FLR is not supported or any 
> issue with FLR

It looks to me as if the slot reset could also fail despite the probe
having succeeded. In such a case it might be better to try a bus
reset, i.e. the sequence would become
- FLR
- slot reset if FLR failed
- bus reset if slot reset failed

Jan