linux-kernel - Re: [PATCH 8/9] vfio/pci: export nvlink2 support into vendor vfio

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Date:   Wed, 10 Mar 2021 09:02:46 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Max Gurtovoy <mgurtovoy@...dia.com>
Cc:     Alexey Kardashevskiy <aik@...abs.ru>, alex.williamson@...hat.com,
        cohuck@...hat.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, liranl@...dia.com, oren@...dia.com,
        tzahio@...dia.com, leonro@...dia.com, yarong@...dia.com,
        aviadye@...dia.com, shahafs@...dia.com, artemp@...dia.com,
        kwankhede@...dia.com, ACurrid@...dia.com, cjia@...dia.com,
        yishaih@...dia.com, mjrosato@...ux.ibm.com, hch@....de
Subject: Re: [PATCH 8/9] vfio/pci: export nvlink2 support into vendor
 vfio_pci drivers

On Wed, Mar 10, 2021 at 02:57:57PM +0200, Max Gurtovoy wrote:

> > > +    .err_handler        = &vfio_pci_core_err_handlers,
> > > +};
> > > +
> > > +#ifdef CONFIG_VFIO_PCI_DRIVER_COMPAT
> > > +struct pci_driver *get_nvlink2gpu_vfio_pci_driver(struct pci_dev *pdev)
> > > +{
> > > +    if (pci_match_id(nvlink2gpu_vfio_pci_driver.id_table, pdev))
> > > +        return &nvlink2gpu_vfio_pci_driver;
> > 
> > 
> > Why do we need matching PCI ids here instead of looking at the FDT which
> > will work better?
> 
> what is FDT ? any is it better to use it instead of match_id ?

This is emulating the device_driver match for the pci_driver.

I don't think we can combine FDT matching with pci_driver, can we?

Jason