linux-kernel - Re: [PATCH v3 2/2] uacce: add uacce driver

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Date:   Wed, 4 Sep 2019 14:38:03 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Zhangfei Gao <zhangfei.gao@...aro.org>
Cc:     Arnd Bergmann <arnd@...db.de>, jonathan.cameron@...wei.com,
        kenneth-lee-2012@...mail.com, Wangzhou <wangzhou1@...ilicon.com>,
        linux-accelerators@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Kenneth Lee <liguozhu@...ilicon.com>,
        Zaibo Xu <xuzaibo@...wei.com>
Subject: Re: [PATCH v3 2/2] uacce: add uacce driver

On Tue, Sep 03, 2019 at 12:14:47PM +0800, Zhangfei Gao wrote:
> From: Kenneth Lee <liguozhu@...ilicon.com>
> 
> Uacce (Unified/User-space-access-intended Accelerator Framework) targets to
> provide Shared Virtual Addressing (SVA) between accelerators and processes.
> So accelerator can access any data structure of the main cpu.
> This differs from the data sharing between cpu and io device, which share
> data content rather than address.
> Since unified address, hardware and user space of process can share the
> same virtual address in the communication.
> 
> Uacce create a chrdev for every registration, the queue is allocated to
> the process when the chrdev is opened. Then the process can access the
> hardware resource by interact with the queue file. By mmap the queue
> file space to user space, the process can directly put requests to the
> hardware without syscall to the kernel space.
> 
> Signed-off-by: Kenneth Lee <liguozhu@...ilicon.com>
> Signed-off-by: Zaibo Xu <xuzaibo@...wei.com>
> Signed-off-by: Zhou Wang <wangzhou1@...ilicon.com>
> Signed-off-by: Zhangfei Gao <zhangfei.gao@...aro.org>
> ---
>  Documentation/ABI/testing/sysfs-driver-uacce |   47 ++
>  drivers/misc/Kconfig                         |    1 +
>  drivers/misc/Makefile                        |    1 +
>  drivers/misc/uacce/Kconfig                   |   13 +
>  drivers/misc/uacce/Makefile                  |    2 +
>  drivers/misc/uacce/uacce.c                   | 1096 ++++++++++++++++++++++++++
>  include/linux/uacce.h                        |  172 ++++
>  include/uapi/misc/uacce.h                    |   39 +
>  8 files changed, 1371 insertions(+)
>  create mode 100644 Documentation/ABI/testing/sysfs-driver-uacce
>  create mode 100644 drivers/misc/uacce/Kconfig
>  create mode 100644 drivers/misc/uacce/Makefile
>  create mode 100644 drivers/misc/uacce/uacce.c
>  create mode 100644 include/linux/uacce.h
>  create mode 100644 include/uapi/misc/uacce.h
> 
> diff --git a/Documentation/ABI/testing/sysfs-driver-uacce b/Documentation/ABI/testing/sysfs-driver-uacce
> new file mode 100644
> index 0000000..ee0a66e
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-driver-uacce
> @@ -0,0 +1,47 @@
> +What:           /sys/class/uacce/hisi_zip-<n>/id
> +Date:           Sep 2019
> +KernelVersion:  5.3

5.3 will be released in a week or so, without this file in it, so that's
not ok here :(