linux-kernel - Re: [RFC PATCH v3 1/4] vfio: Define device specific irq type capability

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Message-ID: <20190627102047.elwxbzqcyw4ixy7x@sirius.home.kraxel.org>
Date:   Thu, 27 Jun 2019 12:20:47 +0200
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     "Zhang, Tina" <tina.zhang@...el.com>
Cc:     "Tian, Kevin" <kevin.tian@...el.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "zhenyuw@...ux.intel.com" <zhenyuw@...ux.intel.com>,
        "Yuan, Hang" <hang.yuan@...el.com>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "Lv, Zhiyuan" <zhiyuan.lv@...el.com>,
        "intel-gvt-dev@...ts.freedesktop.org" 
        <intel-gvt-dev@...ts.freedesktop.org>,
        "Wang, Zhi A" <zhi.a.wang@...el.com>
Subject: Re: [RFC PATCH v3 1/4] vfio: Define device specific irq type
 capability

On Thu, Jun 27, 2019 at 08:55:21AM +0000, Zhang, Tina wrote:
> 
> 
> > -----Original Message-----
> > From: intel-gvt-dev [mailto:intel-gvt-dev-bounces@...ts.freedesktop.org] On
> > Behalf Of Gerd Hoffmann
> > Sent: Thursday, June 27, 2019 2:20 PM
> > To: Zhang, Tina <tina.zhang@...el.com>
> > Cc: Tian, Kevin <kevin.tian@...el.com>; kvm@...r.kernel.org; linux-
> > kernel@...r.kernel.org; zhenyuw@...ux.intel.com; Yuan, Hang
> > <hang.yuan@...el.com>; alex.williamson@...hat.com; Lv, Zhiyuan
> > <zhiyuan.lv@...el.com>; intel-gvt-dev@...ts.freedesktop.org; Wang, Zhi A
> > <zhi.a.wang@...el.com>
> > Subject: Re: [RFC PATCH v3 1/4] vfio: Define device specific irq type
> > capability
> > 
> >   Hi,
> > 
> > > +struct vfio_irq_info_cap_type {
> > > +	struct vfio_info_cap_header header;
> > > +	__u32 type;     /* global per bus driver */
> > > +	__u32 subtype;  /* type specific */
> > 
> > Do we really need both type and subtype?
> Then, if one device has several irqs, how can we identify them?
> Thanks.

Just assign multiple types?

cheers,
  Gerd