[vfio-users] How to hard-reset a PCI-e device?

[Taiidan at gmx.com]

This is for a server, so that isn't useful.

I can't understand why the maintainers of vfio don't do a hard reset if 
FLR doesn't work.


On 02/13/2017 04:16 PM, Benny Johnson wrote:
> I've had some success with just suspending my system and then waking 
> it back up to reset the graphics card (GTX 580). I believe there is a 
> way to do it directly on the card, but I never got around to setting 
> it up.
>
>
> On 02/13/2017 01:45 PM, Taiidan at gmx.com wrote:
>> Sometimes when trying to start a VM with a graphics card (nvidia of 
>> course) I receive these errors in dmesg and then I must restart the 
>> entire system to be able to assign that card again as it gets stuck 
>> in S3 mode.
>> I would like to know exactly how I can hard reset the card so that it 
>> can be usable again, such as killing and then restoring power to the 
>> slot.
>>
>> [  144.090784] pciehp 0000:00:02.0:pcie004: Timeout on hotplug 
>> command 0x13f1 (issued 139840 msec ago)
>> [  145.103321] pciehp 0000:00:02.0:pcie004: Timeout on hotplug 
>> command 0x03f1 (issued 1012 msec ago)
>> [  146.135888] pciehp 0000:00:02.0:pcie004: Timeout on hotplug 
>> command 0x03f1 (issued 2044 msec ago)
>> [  146.167911] vfio-pci 0000:00:13.2: enabling device (0000 -> 0002)
>> [  146.216069] vfio_cap_init: 0000:00:13.2 hiding cap 0xa
>> [  146.267953] pciehp 0000:00:0b.0:pcie004: Timeout on hotplug 
>> command 0x13f1 (issued 139980 msec ago)
>> [  147.280511] pciehp 0000:00:0b.0:pcie004: Timeout on hotplug 
>> command 0x03f1 (issued 1012 msec ago)
>> [  147.311080] AMD-Vi: Event logged [
>> [  147.311086] INVALID_DEVICE_REQUEST device=00:0c.0 
>> address=0x000000fdf8920000 flags=0x0a00]
>> [  148.313042] pciehp 0000:00:0b.0:pcie004: Timeout on hotplug 
>> command 0x03f1 (issued 2044 msec ago)
>> [  148.485141] pciehp 0000:00:02.0:pcie004: Timeout on hotplug 
>> command 0x13f1 (issued 2348 msec ago)
>> [  149.493675] pciehp 0000:00:02.0:pcie004: Timeout on hotplug 
>> command 0x03f1 (issued 1008 msec ago)
>> [  150.554217] pciehp 0000:00:02.0:pcie004: Timeout on hotplug 
>> command 0x03f1 (issued 2068 msec ago)
>> [  150.554534] vfio_bar_restore: 0000:05:00.1 reset recovery - 
>> restoring bars
>> [  150.554566] vfio_bar_restore: 0000:05:00.1 reset recovery - 
>> restoring bars
>> [  150.554696] vfio_bar_restore: 0000:05:00.0 reset recovery - 
>> restoring bars
>> [  150.554730] vfio_bar_restore: 0000:05:00.0 reset recovery - 
>> restoring bars
>> [  151.262550] vfio_bar_restore: 0000:05:00.0 reset recovery - 
>> restoring bars
>> [  151.293927] vfio_bar_restore: 0000:05:00.1 reset recovery - 
>> restoring bars
>>
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>