From: "Pasi Kärkkäinen" <pasik@iki.fi>
To: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Jan Beulich <JBeulich@suse.com>, Juergen Gross <jgross@suse.com>,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
bhelgaas@google.com, xen-devel@lists.xenproject.org,
roger.pau@citrix.com,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
George Dunlap <george.dunlap@eu.citrix.com>
Subject: Re: [Xen-devel] [PATCH V3 2/2] Xen/PCIback: Implement PCI flr/slot/bus reset with 'reset' SysFS attribute
Date: Tue, 18 Sep 2018 10:15:19 +0300 [thread overview]
Message-ID: <20180918071519.GG18222@reaktio.net> (raw)
In-Reply-To: <a726840b-8a5c-0890-73c6-3a95a7205153@oracle.com>
Hi,
On Mon, Sep 17, 2018 at 02:06:02PM -0400, Boris Ostrovsky wrote:
> On 9/16/18 7:43 AM, Pasi Kärkkäinen wrote:
> > Hi,
> >
> > On Mon, Dec 18, 2017 at 12:32:11PM -0500, Boris Ostrovsky wrote:
> >> On 12/18/2017 02:36 AM, Jan Beulich wrote:
> >>>>>> On 15.12.17 at 20:52, <Govinda.Tatti@Oracle.COM> wrote:
> >>>>>>> +static int pcistub_device_reset(struct pci_dev *dev)
> >>>>>>> +{
> >>>>>>> + struct xen_pcibk_dev_data *dev_data;
> >>>>>>> + bool slot = false, bus = false;
> >>>>>>> + struct pcistub_args arg = {};
> >>>>>>> +
> >>>>>>> + if (!dev)
> >>>>>>> + return -EINVAL;
> >>>>>>> +
> >>>>>>> + dev_dbg(&dev->dev, "[%s]\n", __func__);
> >>>>>>> +
> >>>>>>> + /* First check and try FLR */
> >>>>>>> + if (pcie_has_flr(dev)) {
> >>>>>>> + dev_dbg(&dev->dev, "resetting %s device using FLR\n",
> >>>>>>> + pci_name(dev));
> >>>>>>> + pcie_flr(dev);
> >>>>>> The lack of error check here puzzled me, but I see the function
> >>>>>> indeed returns void right now. I think the prereq patch should
> >>>>>> change this along with exporting the function - you really don't
> >>>>>> want the device to be handed to a guest when the FLR timed
> >>>>>> out.
> >>>>> We will change pcie_flr() to return error code. I will make this change
> >>>>> in the next version of this patch.
> >>>> I exchanged some emails with Bjorn/Christoph and it looks like Christoph
> >>>> as some planto restructure pcie flr specific functions but I don't know
> >>>> the exact time-frame. For now,I am planning to use existing pcie_flr()
> >>>> after checking FLR capability. We will switchto revised pcie_flr() once
> >>>> it is available.
> >>>>
> >>>> I hope you are fine with this approach. Please let me know. Thanks.
> >>> I've seen that other discussion. I don't think the change here
> >>> should be done prior to the error reporting being put in place,
> >>> for security reasons. But in the end it'll be Konrad as the
> >>> maintainer to judge.
> >>>
> >>> Or wait, looks like there's some confusion in ./MAINTAINERS:
> >>> Konrad is listed as maintainer for "XEN PCI SUBSYSTEM", but the
> >>> list of files doesn't include pciback. So it would instead be Boris
> >>> or Jürgen to give you a final word.
> >>
> >> This is now 4.16 material so we can at least wait until closer to
> >> opening of the merge window when we may have the PCI updates. (And I
> >> just noticed that you responded to Christoph.)
> >>
> >> Besides, we don't want to make kernel changes until the interface is
> >> settled (i.e the toolstack changes are accepted).
> >>
> > It seems Govinda's email address is giving an error, so I assume someone else needs to pick up this pciback 'reset' feature.
> > Is it likely someone else from Oracle can/will pick up and refresh this patch, with the review comments addressed?
>
>
> Govinda is no longer at Oracle.
>
Yep, thought so. Removed from CC list.
> What about the toolstack changes? Have they been accepted? I vaguely
> recall there was a discussion about those changes but don't remember how
> it ended.
>
I don't think toolstack/libxl patch has been applied yet either.
"[PATCH V1 0/1] Xen/Tools: PCI reset using 'reset' SysFS attribute":
https://lists.xen.org/archives/html/xen-devel/2017-12/msg00664.html
"[PATCH V1 1/1] Xen/libxl: Perform PCI reset using 'reset' SysFS attribute":
https://lists.xen.org/archives/html/xen-devel/2017-12/msg00663.html
George asked for some clarifications:
https://lists.xen.org/archives/html/xen-devel/2017-12/msg01044.html
https://lists.xen.org/archives/html/xen-devel/2017-12/msg01116.html
>
> -boris
>
Thanks,
-- Pasi
>
> >
> >
> > Meanwhile the pcie_has_flr() has been exported in upstream Linux kernel, so that's already available for use now.
> >
> > "PCI: Export pcie_has_flr()":
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2d2917f7747805a1f4188672f308d82a8ba01700
> >
> >
> >
>
next prev parent reply other threads:[~2018-09-18 7:15 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-07 22:21 [PATCH V3 0/2] Xen/PCIback: PCI reset using 'reset' SysFS attribute Govinda Tatti
2017-12-07 22:21 ` [PATCH V3 1/2] Drivers/PCI: Export pcie_has_flr() interface Govinda Tatti
2017-12-08 20:24 ` Bjorn Helgaas
2017-12-12 0:29 ` Govinda Tatti
2017-12-12 0:59 ` Bjorn Helgaas
2017-12-13 20:46 ` [Xen-devel] " Govinda Tatti
2017-12-13 21:24 ` Bjorn Helgaas
2017-12-14 12:52 ` Christoph Hellwig
2017-12-15 0:24 ` Bjorn Helgaas
2017-12-15 15:48 ` Govinda Tatti
2017-12-15 18:18 ` Bjorn Helgaas
2017-12-15 20:01 ` Govinda Tatti
2017-12-18 3:09 ` Alexey Kardashevskiy
2017-12-18 12:26 ` Christoph Hellwig
2017-12-18 17:22 ` Govinda Tatti
2018-09-09 18:59 ` Pasi Kärkkäinen
2018-09-10 2:33 ` Sinan Kaya
2018-09-10 9:52 ` Pasi Kärkkäinen
2018-09-10 17:04 ` Sinan Kaya
2017-12-12 15:07 ` Christoph Hellwig
2017-12-07 22:21 ` [PATCH V3 2/2] Xen/PCIback: Implement PCI flr/slot/bus reset with 'reset' SysFS attribute Govinda Tatti
2017-12-08 9:34 ` Jan Beulich
2017-12-12 15:01 ` Govinda Tatti
[not found] ` <8a3bc517-1255-4547-d244-5c400e44cc77@Oracle.COM>
2017-12-12 15:01 ` Jan Beulich
2017-12-12 15:14 ` [Xen-devel] " Govinda Tatti
2017-12-15 19:52 ` Govinda Tatti
2017-12-18 7:36 ` Jan Beulich
2017-12-18 17:32 ` Boris Ostrovsky
2018-09-16 11:43 ` [Xen-devel] " Pasi Kärkkäinen
2018-09-17 18:06 ` Boris Ostrovsky
2018-09-18 7:15 ` Pasi Kärkkäinen [this message]
2018-09-18 9:32 ` George Dunlap
2018-09-18 18:09 ` Boris Ostrovsky
2018-09-19 9:05 ` Roger Pau Monné
2018-10-03 15:51 ` Pasi Kärkkäinen
2018-10-08 14:32 ` Boris Ostrovsky
2019-08-26 21:05 ` Pasi Kärkkäinen
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