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From: Nathan Chancellor <nathan@kernel.org>
To: Harry Wentland <harry.wentland@amd.com>
Cc: amd-gfx@lists.freedesktop.org, ndesaulniers@google.com,
	torvalds@linux-foundation.org, linux-kernel@vger.kernel.org,
	arnd@kernel.org, sunpeng.li@amd.com, alexander.deucher@amd.com,
	christian.koenig@amd.com, Xinhui.Pan@amd.com, linux@roeck-us.net,
	llvm@lists.linux.dev
Subject: Re: [PATCH 0/4] Fix stack usage of DML
Date: Thu, 9 Sep 2021 14:53:31 -0700	[thread overview]
Message-ID: <YTqCWyZ7mXDaJ5HQ@Ryzen-9-3900X.localdomain> (raw)
In-Reply-To: <20210909010023.29110-1-harry.wentland@amd.com>

On Wed, Sep 08, 2021 at 09:00:19PM -0400, Harry Wentland wrote:
> With the '-Werror' enablement patch the amdgpu build was failing
> on clang builds because a bunch of functions were blowing past
> the 1024 byte stack frame default. Due to this we also noticed
> that a lot of functions were passing large structs by value
> instead of by pointer.
> 
> This series attempts to fix this.
> 
> There is still one remaining function that blows the 1024 limit by 40 bytes:
> 
> drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn21/display_mode_vba_21.c:3397:6:
>  
> error: stack frame size of 1064 bytes in function 
> 'dml21_ModeSupportAndSystemConfigurationFull' [-Werror,-Wframe-larger-than=]
> 
> This will be a slightly more challenging fix but I'll see if we can get it
> below 1024 by breaking it into smaller functions.
> 
> With this series I can build amdgpu with CC=clang and a stack frame limit of 
> 1064.
> 
> This series boots on a Radeon RX 5500 XT.
> 
> Harry Wentland (4):
>   drm/amd/display: Pass display_pipe_params_st as const in DML
>   drm/amd/display: Pass all structs in display_rq_dlg_helpers by pointer
>   drm/amd/display: Fix rest of pass-by-value structs in DML
>   drm/amd/display: Allocate structs needed by dcn_bw_calc_rq_dlg_ttu in
>     pipe_ctx

This series resolves some warnings that were reported on our issue
tracker for 32-bit x86. I do see some other warnings in amdgpu with
clang in various configurations but this is a great start. Thank you for
taking a look at them. For the series:

Build-tested-by: Nathan Chancellor <nathan@kernel.org>

>  .../gpu/drm/amd/display/dc/calcs/dcn_calcs.c  |  55 ++--
>  .../drm/amd/display/dc/dcn20/dcn20_resource.c |   2 +-
>  .../dc/dml/dcn20/display_rq_dlg_calc_20.c     | 158 +++++------
>  .../dc/dml/dcn20/display_rq_dlg_calc_20.h     |   4 +-
>  .../dc/dml/dcn20/display_rq_dlg_calc_20v2.c   | 156 +++++------
>  .../dc/dml/dcn20/display_rq_dlg_calc_20v2.h   |   4 +-
>  .../dc/dml/dcn21/display_rq_dlg_calc_21.c     | 156 +++++------
>  .../dc/dml/dcn21/display_rq_dlg_calc_21.h     |   4 +-
>  .../dc/dml/dcn30/display_rq_dlg_calc_30.c     | 132 ++++-----
>  .../dc/dml/dcn30/display_rq_dlg_calc_30.h     |   4 +-
>  .../dc/dml/dcn31/display_rq_dlg_calc_31.c     | 166 ++++++------
>  .../dc/dml/dcn31/display_rq_dlg_calc_31.h     |   4 +-
>  .../drm/amd/display/dc/dml/display_mode_lib.h |   4 +-
>  .../display/dc/dml/display_rq_dlg_helpers.c   | 256 +++++++++---------
>  .../display/dc/dml/display_rq_dlg_helpers.h   |  20 +-
>  .../display/dc/dml/dml1_display_rq_dlg_calc.c | 246 ++++++++---------
>  .../display/dc/dml/dml1_display_rq_dlg_calc.h |  10 +-
>  .../gpu/drm/amd/display/dc/inc/core_types.h   |   3 +
>  18 files changed, 695 insertions(+), 689 deletions(-)
> 
> -- 
> 2.33.0

  parent reply	other threads:[~2021-09-09 21:53 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-09  1:00 [PATCH 0/4] Fix stack usage of DML Harry Wentland
2021-09-09  1:00 ` [PATCH 1/4] drm/amd/display: Pass display_pipe_params_st as const in DML Harry Wentland
2021-09-15 23:21   ` [1/4] " Anson Jacob
2021-09-09  1:00 ` [PATCH 2/4] drm/amd/display: Pass all structs in display_rq_dlg_helpers by pointer Harry Wentland
2021-09-15 23:23   ` [2/4] " Anson Jacob
2021-09-09  1:00 ` [PATCH 3/4] drm/amd/display: Fix rest of pass-by-value structs in DML Harry Wentland
2021-09-15 23:24   ` [3/4] " Anson Jacob
2021-09-09  1:00 ` [PATCH 4/4] drm/amd/display: Allocate structs needed by dcn_bw_calc_rq_dlg_ttu in pipe_ctx Harry Wentland
2021-09-09  8:04 ` [PATCH 0/4] Fix stack usage of DML Christian König
2021-09-09 21:53 ` Nathan Chancellor [this message]
2021-09-15 21:58 ` Leo Li
  -- strict thread matches above, loose matches on Subject: below --
2021-09-09  0:30 Harry Wentland

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