linux-kernel - Re: [PATCH] vfio: re-arrange vfio region definitions

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Date:   Wed, 31 Jul 2019 15:33:27 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Auger Eric <eric.auger@...hat.com>
Cc:     Cornelia Huck <cohuck@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vfio: re-arrange vfio region definitions

On Wed, 31 Jul 2019 20:47:07 +0200
Auger Eric <eric.auger@...hat.com> wrote:

> Hi Connie,
> 
> On 7/17/19 1:49 PM, Cornelia Huck wrote:
> > It is easy to miss already defined region types. Let's re-arrange
> > the definitions a bit and add more comments to make it hopefully
> > a bit clearer.
> > 
> > No functional change.
> > 
> > Signed-off-by: Cornelia Huck <cohuck@...hat.com>
> > ---
> >  include/uapi/linux/vfio.h | 19 ++++++++++++-------
> >  1 file changed, 12 insertions(+), 7 deletions(-)
> > 
> > diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
> > index 8f10748dac79..d9bcf40240be 100644
> > --- a/include/uapi/linux/vfio.h
> > +++ b/include/uapi/linux/vfio.h
> > @@ -295,15 +295,23 @@ struct vfio_region_info_cap_type {
> >  	__u32 subtype;	/* type specific */
> >  };
> >  
> > +/*
> > + * List of region types, global per bus driver.
> > + * If you introduce a new type, please add it here.
> > + */
> > +
> > +/* PCI region type containing a PCI vendor part */
> >  #define VFIO_REGION_TYPE_PCI_VENDOR_TYPE	(1 << 31)
> >  #define VFIO_REGION_TYPE_PCI_VENDOR_MASK	(0xffff)
> > +#define VFIO_REGION_TYPE_GFX                    (1)
> > +#define VFIO_REGION_TYPE_CCW			(2)
> >  
> > -/* 8086 Vendor sub-types */
> > +/* 8086 vendor PCI sub-types */
> >  #define VFIO_REGION_SUBTYPE_INTEL_IGD_OPREGION	(1)
> >  #define VFIO_REGION_SUBTYPE_INTEL_IGD_HOST_CFG	(2)
> >  #define VFIO_REGION_SUBTYPE_INTEL_IGD_LPC_CFG	(3)
> >  
> > -#define VFIO_REGION_TYPE_GFX                    (1)
> > +/* GFX sub-types */
> >  #define VFIO_REGION_SUBTYPE_GFX_EDID            (1)
> >  
> >  /**
> > @@ -353,20 +361,17 @@ struct vfio_region_gfx_edid {
> >  #define VFIO_DEVICE_GFX_LINK_STATE_DOWN  2
> >  };
> >  
> > -#define VFIO_REGION_TYPE_CCW			(2)
> >  /* ccw sub-types */
> >  #define VFIO_REGION_SUBTYPE_CCW_ASYNC_CMD	(1)
> >  
> > +/* 10de vendor PCI sub-types */
> >  /*
> > - * 10de vendor sub-type
> > - *
> >   * NVIDIA GPU NVlink2 RAM is coherent RAM mapped onto the host address space.
> >   */
> >  #define VFIO_REGION_SUBTYPE_NVIDIA_NVLINK2_RAM	(1)
> >  
> > +/* 1014 vendor PCI sub-types*/
> >  /*
> > - * 1014 vendor sub-type  
> Maybe the 10de vendor sub-type and 1014 vendor sub-type could be put
> just after /* 8086 vendor PCI sub-types */
> 
> More generally if it were possible to leave the subtypes close to their
> parent type too, this would be beneficial I think.
> 
> Besides that becomes sensible to put all those definitions together.

Any sort of consolidation or grouping is an improvement here, thanks
for taking this on, Connie!  I haven't started my branch yet for v5.4,
but if you want to iterate to something agreeable, I'll happily take
the end product :)  The original patch here looks like a good degree of
consolidating the type definitions and improving consistency without
moving large chunks of code.  Thanks,

Alex