linux-kernel - Re: [PATCH 0/2] remove DC_FP

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 30 Mar 2022 08:41:30 -0400
From:   Rodrigo Siqueira Jordao <rjordrigo@....com>
To:     Melissa Wen <mwen@...lia.com>, amd-gfx@...ts.freedesktop.org,
        airlied@...ux.ie, alexander.deucher@....com,
        christian.koenig@....com, daniel@...ll.ch, harry.wentland@....com,
        Rodrigo.Siqueira@....com, sunpeng.li@....com, Xinhui.Pan@....com
Cc:     Qingqing Zhuo <qingqing.zhuo@....com>,
        Dmytro Laktyushkin <Dmytro.Laktyushkin@....com>,
        Jasdeep Dhillon <jdhillon@....com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] remove DC_FP_* wrappers in dml files



On 2022-03-26 16:24, Melissa Wen wrote:
>  From FPU documentation, developers must not use DC_FP_START/END in dml
> files, but invoke it when calling FPU-associated functions (isolated in
> dml folder). Therefore, the first patch renames dcn10_validate_bandwidth
> in dml/calcs to dcn_ for generalization, declares dcn10_validate_bandwidth
> in dcn10 - that calls dcn_validate_bandwidth and wraps with DC_FP_*
> accordingly. The second patch removes invocations of DC_FP_* from dml
> files and properly wraps FPU functions in dc code outside dml folder.
> 
> Melissa Wen (2):
>    drm/amd/display: detach fpu operations from dcn10_validate_bandwidth
>      in calcs
>    drm/amd/display: remove DC_FP_* wrapper from dml folder
> 
>   .../amd/display/dc/dcn10/dcn10_hw_sequencer.c | 10 ++++++++--
>   .../drm/amd/display/dc/dcn10/dcn10_resource.c | 16 ++++++++++++++++
>   .../drm/amd/display/dc/dml/calcs/dcn_calcs.c  | 19 +------------------
>   .../drm/amd/display/dc/dml/dcn20/dcn20_fpu.c  |  2 --
>   .../gpu/drm/amd/display/dc/inc/dcn_calcs.h    |  2 +-
>   5 files changed, 26 insertions(+), 23 deletions(-)
> 


Hi,

Thanks a lot for your patch!

I reviewed and tested this series and lgtm. Applied to amd-staging-drm-next.

Btw, I agree with Christian. Can you try to find a way to add a 
compilation error or warning if the developer tries to add DC_FP_* 
inside DML?

Also, about the question of recursive calling to DC_FP_*, it should be 
safe if using DC_FP_*.

Thanks
Siqueira