Thanks Pasi for your response. Please see below for my comments.
On 11/8/2017 11:38 AM, Pasi Kärkkäinen wrote:
> Hi,
>
> On Wed, Nov 08, 2017 at 09:44:48AM -0600, Govinda Tatti wrote:
>> Thanks Jan for your review comments. Please see below for my comments.
>>
>> On 11/7/2017 8:40 AM, Jan Beulich wrote:
>>>>>> On 06.11.17 at 18:48, <[email protected]> wrote:
>>>> --- a/Documentation/ABI/testing/sysfs-driver-pciback
>>>> +++ b/Documentation/ABI/testing/sysfs-driver-pciback
>>>> @@ -11,3 +11,15 @@ Description:
>>>> #echo 00:19.0-E0:2:FF > /sys/bus/pci/drivers/pciback/quirks
>>>> will allow the guest to read and write to the configuration
>>>> register 0x0E.
>>>> +
>>>> +What: /sys/bus/pci/drivers/pciback/do_flr
>>>> +Date: Nov 2017
>>>> +KernelVersion: 4.15
>>>> +Contact: [email protected]
>>>> +Description:
>>>> + An option to perform a slot or bus reset when a PCI device
>>>> + is owned by Xen PCI backend. Writing a string of DDDD:BB:DD.F
>>>> + will cause the pciback driver to perform a slot or bus reset
>>>> + if the device supports it. It also checks to make sure that
>>>> + all of the devices under the bridge are owned by Xen PCI
>>>> + backend.
>>> Why do you name this "do_flr" when you don't even try FLR, but
>>> go to slot or then bus reset right away.
>> Yes, I agree but xen toolstack has already been modified to consume"do_flr"
>> attribute. Hence, we are using the
>> function that matches with sysfs attribute.
>>
> Hmm.. I remember some discussion from ages ago related to this.
>
> Back then it was suggested to "emulate" the flr capability (by doing slot or bus reset) for devices which don't have *native* flr available? So is this patch perhaps related to that?
I don't think so but either Konrad or someone can comment on it.
>
> If the PCI device in question has native flr capability, then native flr is used, right ?
Yes.
> I guess I should read the full patch..
Please check it and let us know your comments.
Cheers
GOVINDA
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