linux-kernel - Re: [RFC PATCH 0/5] Firmware Upload Framework

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Date:   Mon, 15 Nov 2021 05:57:01 -0800
From:   Tom Rix <trix@...hat.com>
To:     Russ Weight <russell.h.weight@...el.com>, sudeep.holla@....com,
        cristian.marussi@....com, ardb@...nel.org,
        bjorn.andersson@...aro.org, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org
Cc:     lgoncalv@...hat.com, yilun.xu@...el.com, hao.wu@...el.com,
        matthew.gerlach@...el.com, "Gong, Richard" <richard.gong@...el.com>
Subject: Re: [RFC PATCH 0/5] Firmware Upload Framework


On 11/10/21 5:13 PM, Russ Weight wrote:
> The Firmware Upload framework provides a common API for uploading firmware
> files to target devices. An example use case involves FPGA devices that
> load FPGA, Card BMC, and firmware images from FLASH when the card boots.
> Users need the ability to update these firmware images while the card is
> in use.
>
> Device drivers that instantiate the Firmware Upload class driver will
> interact with the target device to transfer and authenticate the firmware
> data. Uploads are performed in the context of a kernel worker thread in
> order to facilitate progress indicators during lengthy uploads.
>
> This driver was previously submitted in the context of the FPGA sub-
> system as the "FPGA Image Load Framework", but the framework is generic
> enough to support other devices as well. The previous submission of this
> patch-set can be viewed here:
>
> https://marc.info/?l=linux-kernel&m=163295640216820&w=2
>
> The n3000bmc-sec-update driver is the first driver to use the Firmware
> Upload API. A recent version of these patches can be viewed here:
>
> https://marc.info/?l=linux-kernel&m=163295697217095&w=2
>
> I don't think I am duplicating any functionality that is currently covered
> in the firmware subsystem. I appreciate your feedback on these patches.

This may be a common api for fpga/dfl-, but it is not likely common for 
general devices.

Could the scope of this patchset be reduced to just fpga/dfl for now ?

Something more like stratix10-rsu.

Tom

>
> - Russ
>
> Russ Weight (5):
>    firmware: Create firmware upload framework
>    firmware: upload: Enable firmware uploads
>    firmware: upload: Signal eventfd when complete
>    firmware: upload: Add status ioctl
>    firmware: upload: Enable cancel of firmware upload
>
>   .../driver-api/firmware/firmware-upload.rst   |  54 +++
>   Documentation/driver-api/firmware/index.rst   |   1 +
>   MAINTAINERS                                   |   9 +
>   drivers/firmware/Kconfig                      |   8 +
>   drivers/firmware/Makefile                     |   1 +
>   drivers/firmware/firmware-upload.c            | 413 ++++++++++++++++++
>   include/linux/firmware/firmware-upload.h      |  69 +++
>   include/uapi/linux/firmware-upload.h          |  73 ++++
>   8 files changed, 628 insertions(+)
>   create mode 100644 Documentation/driver-api/firmware/firmware-upload.rst
>   create mode 100644 drivers/firmware/firmware-upload.c
>   create mode 100644 include/linux/firmware/firmware-upload.h
>   create mode 100644 include/uapi/linux/firmware-upload.h
>