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

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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

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