Re: [PATCH] pci: Display PCI IRQ pin in "info pci"

["Michael S. Tsirkin" <mst@redhat.com>]

On Wed, Mar 18, 2020 at 06:06:02PM +0100, Philippe Mathieu-Daudé wrote:
> On 3/17/20 9:11 PM, Peter Xu wrote:
> > On Tue, Mar 17, 2020 at 03:02:57PM -0500, Eric Blake wrote:
> > > On 3/17/20 2:59 PM, Peter Xu wrote:
> > > > Sometimes it would be good to be able to read the pin number along
> > > > with the IRQ number allocated.  Since we'll dump the IRQ number, no
> > > > reason to not dump the pin information.  For example, the vfio-pci
> > > > device will overwrite the pin with the hardware pin number.  It would
> > > > be nice to know the pin number of one assigned device from QMP/HMP.
> > > > 
> > > > CC: Dr. David Alan Gilbert <dgilbert@redhat.com>
> > > > CC: Alex Williamson <alex.williamson@redhat.com>
> > > > CC: Michael S. Tsirkin <mst@redhat.com>
> > > > CC: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
> > > > CC: Julia Suvorova <jusual@redhat.com>
> > > > CC: Markus Armbruster <armbru@redhat.com>
> > > > Signed-off-by: Peter Xu <peterx@redhat.com>
> > > > ---
> > > > 
> > > > This helped me to debug an IRQ sharing issue, so may good to have it
> > > > in master too.
> > > 
> > > We're right at soft freeze.
> > > 
> > > 
> > > > +++ b/qapi/misc.json
> > > > @@ -403,6 +403,8 @@
> > > >    #
> > > >    # @irq: if an IRQ is assigned to the device, the IRQ number
> > > >    #
> > > > +# @irq_pin: the IRQ pin, zero means no IRQ (since 5.1)
> > > > +#
> > > 
> > > But if we really do want it in 5.0, this needs a tweak.  Does the delay
> > > hurt?
> > 
> > No it won't; it's something good to have only.  I'll let the
> > maintainers to decide...
> > 
> > > 
> > > Naming convention: We prefer  unless there is a consistency
> > > issue....
> > > 
> > > >    # @qdev_id: the device name of the PCI device
> > > >    #
> > > >    # @pci_bridge: if the device is a PCI bridge, the bridge information
> > > > @@ -417,8 +419,8 @@
> > > >    { 'struct': 'PciDeviceInfo',
> > > >      'data': {'bus': 'int', 'slot': 'int', 'function': 'int',
> > > >               'class_info': 'PciDeviceClass', 'id': 'PciDeviceId',
> > > > -           '*irq': 'int', 'qdev_id': 'str', '*pci_bridge': 'PciBridgeInfo',
> > > > -           'regions': ['PciMemoryRegion']} }
> > > > +           '*irq': 'int', 'irq_pin': 'int', 'qdev_id': 'str',
> > > > +           '*pci_bridge': 'PciBridgeInfo', 'regions': ['PciMemoryRegion'] }}
> > > 
> > > and the pre-existing pci_bridge is indeed the consistency issue.
> > 
> > Yeh, actually every key in this struct. :)
> 
> Using 'irq-pin':
> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>


Peter can you fix and repost pls?

> > 
> > Thanks,
> >