linux-kernel - Re: [RFC PATCH 3/7] vfio: add spimdev support

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Date:   Thu, 2 Aug 2018 11:07:01 +0800
From:   Kenneth Lee <liguozhu@...ilicon.com>
To:     Randy Dunlap <rdunlap@...radead.org>
CC:     Kenneth Lee <nek.in.cn@...il.com>,
        Jonathan Corbet <corbet@....net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Joerg Roedel <joro@...tes.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Hao Fang <fanghao11@...wei.com>,
        Zhou Wang <wangzhou1@...ilicon.com>,
        Zaibo Xu <xuzaibo@...wei.com>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-crypto@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
        <kvm@...r.kernel.org>, <linux-accelerators@...ts.ozlabs.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Sanjay Kumar <sanjay.k.kumar@...el.com>, <linuxarm@...wei.com>
Subject: Re: [RFC PATCH 3/7] vfio: add spimdev support

On Wed, Aug 01, 2018 at 09:23:52AM -0700, Randy Dunlap wrote:
> Date: Wed, 1 Aug 2018 09:23:52 -0700
> From: Randy Dunlap <rdunlap@...radead.org>
> To: Kenneth Lee <nek.in.cn@...il.com>, Jonathan Corbet <corbet@....net>,
>  Herbert Xu <herbert@...dor.apana.org.au>, "David S . Miller"
>  <davem@...emloft.net>, Joerg Roedel <joro@...tes.org>, Alex Williamson
>  <alex.williamson@...hat.com>, Kenneth Lee <liguozhu@...ilicon.com>, Hao
>  Fang <fanghao11@...wei.com>, Zhou Wang <wangzhou1@...ilicon.com>, Zaibo Xu
>  <xuzaibo@...wei.com>, Philippe Ombredanne <pombredanne@...b.com>, Greg
>  Kroah-Hartman <gregkh@...uxfoundation.org>, Thomas Gleixner
>  <tglx@...utronix.de>, linux-doc@...r.kernel.org,
>  linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
>  iommu@...ts.linux-foundation.org, kvm@...r.kernel.org,
>  linux-accelerators@...ts.ozlabs.org, Lu Baolu <baolu.lu@...ux.intel.com>,
>  Sanjay Kumar <sanjay.k.kumar@...el.com>
> CC: linuxarm@...wei.com
> Subject: Re: [RFC PATCH 3/7] vfio: add spimdev support
> User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101
>  Thunderbird/52.9.1
> Message-ID: <d11c7745-2f31-0f33-1bd8-78379dc66e6e@...radead.org>
> 
> On 08/01/2018 03:22 AM, Kenneth Lee wrote:
> > From: Kenneth Lee <liguozhu@...ilicon.com>
> > 
> > SPIMDEV is "Share Parent IOMMU Mdev". It is a vfio-mdev. But differ from
> > the general vfio-mdev:
> > 
> > 1. It shares its parent's IOMMU.
> > 2. There is no hardware resource attached to the mdev is created. The
> > hardware resource (A `queue') is allocated only when the mdev is
> > opened.
> > 
> > Currently only the vfio type-1 driver is updated to make it to be aware
> > of.
> > 
> > Signed-off-by: Kenneth Lee <liguozhu@...ilicon.com>
> > Signed-off-by: Zaibo Xu <xuzaibo@...wei.com>
> > Signed-off-by: Zhou Wang <wangzhou1@...ilicon.com>
> > ---
> >  drivers/vfio/Kconfig                |   1 +
> >  drivers/vfio/Makefile               |   1 +
> >  drivers/vfio/spimdev/Kconfig        |  10 +
> >  drivers/vfio/spimdev/Makefile       |   3 +
> >  drivers/vfio/spimdev/vfio_spimdev.c | 421 ++++++++++++++++++++++++++++
> >  drivers/vfio/vfio_iommu_type1.c     | 136 ++++++++-
> >  include/linux/vfio_spimdev.h        |  95 +++++++
> >  include/uapi/linux/vfio_spimdev.h   |  28 ++
> >  8 files changed, 689 insertions(+), 6 deletions(-)
> >  create mode 100644 drivers/vfio/spimdev/Kconfig
> >  create mode 100644 drivers/vfio/spimdev/Makefile
> >  create mode 100644 drivers/vfio/spimdev/vfio_spimdev.c
> >  create mode 100644 include/linux/vfio_spimdev.h
> >  create mode 100644 include/uapi/linux/vfio_spimdev.h
> > 
> > diff --git a/drivers/vfio/spimdev/Kconfig b/drivers/vfio/spimdev/Kconfig
> > new file mode 100644
> > index 000000000000..1226301f9d0e
> > --- /dev/null
> > +++ b/drivers/vfio/spimdev/Kconfig
> > @@ -0,0 +1,10 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +config VFIO_SPIMDEV
> > +	tristate "Support for Share Parent IOMMU MDEV"
> > +	depends on VFIO_MDEV_DEVICE
> > +	help
> > +	  Support for VFIO Share Parent IOMMU MDEV, which enable the kernel to
> 
> 	                                                  enables
> 
> > +	  support for the light weight hardware accelerator framework, WrapDrive.
> 
> 	  support the lightweight hardware accelerator framework, WrapDrive.
> 
> > +
> > +	  To compile this as a module, choose M here: the module will be called
> > +	  spimdev.
> 
> 
> -- 
> ~Randy

Thanks, I will update it in next version.

-- 
			-Kenneth(Hisilicon)

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