linux-kernel - Re: [PATCH v2 0/4] fpga: fpga-mgr: move compat_id from fpga

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Date:   Tue, 20 Jul 2021 12:47:51 -0700
From:   Tom Rix <trix@...hat.com>
To:     mdf@...nel.org, corbet@....net, hao.wu@...el.com
Cc:     linux-fpga@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/4] fpga: fpga-mgr: move compat_id from fpga_mgr to
 dfl


On 7/9/21 6:42 AM, trix@...hat.com wrote:
> From: Tom Rix <trix@...hat.com>
>
> A followup to
> https://lore.kernel.org/linux-fpga/aa06a7ca-eff3-5c0d-f3b0-f1d9ddb74526@redhat.com/
> The current storing of compat_id in fpga_manager is dfl specific.
> This makes the refactoring of the release()'s complicated because there
> is a dfl specific flavor of register().
>
> Keeping the compat_id sysfs abi, each implementation through the new
> compat_id_show() fpga_region op can print out whatever value they need
> to the sysfs.  Currently only dfl does.
>
> Since there are now two ops for fpga_region, give fpga_region its
> own ops table.  Add a wrapper for get_bridges().
>
> Changes from
> v1
>    Completely written to keep sysfs abi

Moritz and Hao,

Can you comment on v2 ?

The compat_id abi is unchanged, so dfl's opae userspace access will not 
change.

For ever other board, the nonuse error is the same.

Otherwise, the new region ops is consistent with manger ops.

I can split this first patch out if the refactor of compat_id is 
contentious .

Tom

>
> Tom Rix (4):
>    fpga: region: introduce fpga_region_ops
>    fpga: region: introduce compat_id_show op
>    fpga: dfl: implement the compat_id_show region op
>    fpga: remove compat_id from fpga_manager and fpga_region
>
>   Documentation/driver-api/fpga/fpga-region.rst |  6 ++-
>   drivers/fpga/dfl-fme-mgr.c                    | 23 ++++++-----
>   drivers/fpga/dfl-fme-pr.c                     |  2 +-
>   drivers/fpga/dfl-fme-region.c                 | 21 +++++++++-
>   drivers/fpga/dfl.h                            | 14 +++++++
>   drivers/fpga/fpga-region.c                    | 40 ++++++++++---------
>   drivers/fpga/of-fpga-region.c                 |  6 ++-
>   include/linux/fpga/fpga-mgr.h                 | 13 ------
>   include/linux/fpga/fpga-region.h              | 26 +++++++++---
>   9 files changed, 99 insertions(+), 52 deletions(-)
>