Re: [Xen-devel] testing of Xen PCIbackend support for slot and bus reset

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Tue, Oct 28, 2014 at 11:58:41AM +0100, Martin Öhrling wrote:
> Any progress in testing the branch?
> 
> I can see one thing that could explain if the function isn't called. The
> reset file is only created if it doesn't exist. I know it's unlikely for a
> gpu, but have you verified that your driver didn't export a "reset"-file
> without these patches? As far as I can tell, the drivers reset function
> will be used instead of pcistub_reset_pci_dev() in the presence of a
> "reset"-file.

Use the 'do_flr' SysFS instead of the 'reset'. Once an PCI device
is 'owned' by PCIback the 'reset' is no longer routed to the GPU driver.

And the 'reset' does not do a bus-reset (whcih is what you need for
most GPUs).


> 
> /Martin
> 
> 2014-08-17 3:52 GMT+02:00 Richie <listmail@xxxxxxxxxxxx>:
> 
> >  @Konrad
> >
> > I'm interesting in testing your latest iteration of bus reset support.
> > Actually I cloned your devel/xen-pciback.slot_and_bus.v2.1
> > <http://git.kernel.org/cgit/linux/kernel/git/konrad/xen.git/log/?h=devel/xen-pciback.slot_and_bus.v2.1>
> > branch and tested that but did not seem to reset the vga card.  I did
> > capture dmesg output which was nice and clean regarding resetting the
> > device but don't have it handy.
> >
> > _______________________________________________
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> > Xen-devel@xxxxxxxxxxxxx
> > http://lists.xen.org/xen-devel
> >
> >

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