linux-kernel - Re: [PATCH v2 1/5] drivers/accel: Introduce subsystem

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Date:   Sat, 26 Jan 2019 09:09:15 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Olof Johansson <olof@...om.net>, linux-kernel@...r.kernel.org
Cc:     linux-accelerators@...ts.ozlabs.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Frederic Barrat <fbarrat@...ux.ibm.com>,
        Andrew Donnellan <andrew.donnellan@....ibm.com>,
        ogabbay@...ana.ai, airlied@...hat.com, jglisse@...hat.com
Subject: Re: [PATCH v2 1/5] drivers/accel: Introduce subsystem

Hi,

Please see a few corrections inline...

On 1/25/19 1:13 PM, Olof Johansson wrote:
> 
>  Documentation/accelerators/README.rst | 42 +++++++++++++++++++++++++++++++++++
>  MAINTAINERS                           |  8 +++++++
>  drivers/Kconfig                       |  2 ++
>  drivers/Makefile                      |  1 +
>  drivers/accel/Kconfig                 | 16 +++++++++++++
>  drivers/accel/Makefile                |  5 +++++
>  6 files changed, 74 insertions(+)
>  create mode 100644 Documentation/accelerators/README.rst
>  create mode 100644 drivers/accel/Kconfig
>  create mode 100644 drivers/accel/Makefile
> 
> diff --git a/Documentation/accelerators/README.rst b/Documentation/accelerators/README.rst
> new file mode 100644
> index 0000000000000..79049ff99e93e
> --- /dev/null
> +++ b/Documentation/accelerators/README.rst
> @@ -0,0 +1,42 @@
> +.. _readme:
> +
> +Hardware offload accelerator subsystem
> +======================================
> +
> +This is a brief overview of the subsystem (grouping) of hardware
> +accelerators kept under drivers/accel
> +
> +Types of hardware supported
> +---------------------------
> +
> +  The general types of hardware supported are hardware devices that has

                                                                  that have

> +  general interactions of sending commands and buffers to the hardware,
> +  returning completions and possible filled buffers back, together
> +  with the usual driver pieces around hardware control, setup, error
> +  handling, etc.
> +
> +  Drivers that fit into other subsystems are expected to be merged
> +  there, and use the appropriate userspace interfaces of said functional
> +  areas. We don't expect to see drivers for network, storage, graphics
> +  and similar hardware implemented by drivers here.
> +
> +Expectations for contributions
> +------------------------------
> +
> + - Platforms and hardware that has fully open stacks, from Firmware to

                             that have

> +   Userspace, are always going to be given preferential treatment. These
> +   platforms give the best insight for behavior and interaction of all
> +   layers, including ability to improve implementation across the stack
> +   over time.
> +
> + - If a platform is partially proprietary, it is still expected that the
> +   portions that interact the driver can be shared in a form that allows

               that interact with the driver

> +   for exercising the hardware/driver and evolution of the interface over
> +   time. This could be separated into a shared library and test/sample
> +   programs, for example.
> +
> + - Over time, there is an expectation to converge drivers over to shared
> +   frameworks and interfaces. Until then, the general rule is that no
> +   more than one driver per vendor will be acceptable. For vendors that
> +   aren't participating in the work towards shared frameworks over time,
> +   we reserve the right to phase out support for the hardware.

> diff --git a/drivers/accel/Kconfig b/drivers/accel/Kconfig
> new file mode 100644
> index 0000000000000..13b36c0398895
> --- /dev/null
> +++ b/drivers/accel/Kconfig
> @@ -0,0 +1,16 @@
> +#
> +# Drivers for hardware offload accelerators
> +# See Documentation/accel/README.rst for more details
> +#
> +
> +menuconfig ACCEL
> +	bool "Hardware offload accelerator support"
> +        help

Use tab instead of spaces above.

> +	  HW offload accelerators are used for high-bandwidth workloads
> +	  where a higher-level kernel/userspace interface isn't suitable.
> +
> +if ACCEL
> +
> +comment "HW Accellerator drivers"
> +
> +endif


-- 
~Randy