From: "Chen, Chen-Yu" <Chen-Yu.Chen@amd.com>
To: Alex Hung <alex.hung@amd.com>, amd-gfx@lists.freedesktop.org
Cc: Harry Wentland <harry.wentland@amd.com>,
Leo Li <sunpeng.li@amd.com>,
Aurabindo Pillai <aurabindo.pillai@amd.com>,
Roman Li <roman.li@amd.com>, Wayne Lin <wayne.lin@amd.com>,
Tom Chung <chiahsuan.chung@amd.com>,
Fangzhi Zuo <jerry.zuo@amd.com>,
Dan Wheeler <daniel.wheeler@amd.com>, Ray Wu <Ray.Wu@amd.com>,
Ivan Lipski <ivan.lipski@amd.com>,
Austin Zheng <austin.zheng@amd.com>
Subject: Re: [PATCH 4/6] drm/amd/display: Refactor dml_core_mode_support to reduce stack frame
Date: Wed, 3 Dec 2025 17:42:07 +0800 [thread overview]
Message-ID: <0bb4a734-5263-4011-9ca6-eedcbf3bc50a@amd.com> (raw)
In-Reply-To: <7eba047f-b427-4191-94c0-eda17bbb99ed@amd.com>
Hi Alex,
I wiil add it before upstream.
Regards,
Chenyu
On 12/3/2025 12:31 AM, Alex Hung wrote:
>
>
> On 12/2/25 09:29, Alex Hung wrote:
>>
>>
>> On 12/2/25 03:21, Chenyu Chen wrote:
>>> From: Alex Hung <alex.hung@amd.com>
>>>
>>> [WHAT]
>>> When compiling Linux kernel with clang, the following warning / error
>>> messages pops up:
>>>
>>> drivers/gpu/drm/amd/amdgpu/../dal-dev/dc/dml2_0/
>>> display_mode_core.c:6853:12:
>>> error: stack frame size (2120) exceeds limit (2056) in
>>> 'dml_core_mode_support' [-Werror,-Wframe-larger-than]
>>> 6853 | dml_bool_t dml_core_mode_support(struct display_mode_lib_st
>>> *mode_lib)
>>>
>>> [HOW]
>>> Refactoring CalculateVMRowAndSwath_params assignments to a new function
>>> helps reduce the stack frame size in dml_core_mode_support.
>>>
>> Hi Chenyu,
>>
>> A bug seems to be related. Can you add a buglink? Thanks.
>>
>> Buglink: https://gitlab.freedesktop.org/drm/amd/-/issues/4733
>
> Correction, Add "Closes" instead of "Buglink"
>
>>
>>> Reviewed-by: Austin Zheng <austin.zheng@amd.com>
>>> Reviewed-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
>>> Signed-off-by: Alex Hung <alex.hung@amd.com>
>>> Signed-off-by: Chenyu Chen <chen-yu.chen@amd.com>
>>> ---
>>> .../amd/display/dc/dml2_0/display_mode_core.c | 134 ++++++++++--------
>>> 1 file changed, 71 insertions(+), 63 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/amd/display/dc/dml2_0/display_mode_core.c
>>> b/drivers/gpu/drm/amd/display/dc/dml2_0/display_mode_core.c
>>> index c468f492b876..09303c282495 100644
>>> --- a/drivers/gpu/drm/amd/display/dc/dml2_0/display_mode_core.c
>>> +++ b/drivers/gpu/drm/amd/display/dc/dml2_0/display_mode_core.c
>>> @@ -6711,6 +6711,76 @@ static noinline_for_stack void
>>> dml_prefetch_check(struct display_mode_lib_st *mo
>>> } // for j
>>> }
>>> +static noinline_for_stack void set_vm_row_and_swath_parameters(struct
>>> display_mode_lib_st *mode_lib)
>>> +{
>>> + struct CalculateVMRowAndSwath_params_st
>>> *CalculateVMRowAndSwath_params = &mode_lib-
>>>> scratch.CalculateVMRowAndSwath_params;
>>> + struct dml_core_mode_support_locals_st *s = &mode_lib-
>>>> scratch.dml_core_mode_support_locals;
>>> +
>>> + CalculateVMRowAndSwath_params->NumberOfActiveSurfaces = mode_lib-
>>>> ms.num_active_planes;
>>> + CalculateVMRowAndSwath_params->myPipe = s->SurfParameters;
>>> + CalculateVMRowAndSwath_params->SurfaceSizeInMALL = mode_lib-
>>>> ms.SurfaceSizeInMALL;
>>> + CalculateVMRowAndSwath_params->PTEBufferSizeInRequestsLuma =
>>> mode_lib->ms.ip.dpte_buffer_size_in_pte_reqs_luma;
>>> + CalculateVMRowAndSwath_params->PTEBufferSizeInRequestsChroma =
>>> mode_lib->ms.ip.dpte_buffer_size_in_pte_reqs_chroma;
>>> + CalculateVMRowAndSwath_params->DCCMetaBufferSizeBytes = mode_lib-
>>>> ms.ip.dcc_meta_buffer_size_bytes;
>>> + CalculateVMRowAndSwath_params->UseMALLForStaticScreen = mode_lib-
>>>> ms.cache_display_cfg.plane.UseMALLForStaticScreen;
>>> + CalculateVMRowAndSwath_params->UseMALLForPStateChange = mode_lib-
>>>> ms.cache_display_cfg.plane.UseMALLForPStateChange;
>>> + CalculateVMRowAndSwath_params->MALLAllocatedForDCN = mode_lib-
>>>> ms.soc.mall_allocated_for_dcn_mbytes;
>>> + CalculateVMRowAndSwath_params->SwathWidthY = mode_lib-
>>>> ms.SwathWidthYThisState;
>>> + CalculateVMRowAndSwath_params->SwathWidthC = mode_lib-
>>>> ms.SwathWidthCThisState;
>>> + CalculateVMRowAndSwath_params->GPUVMEnable = mode_lib-
>>>> ms.cache_display_cfg.plane.GPUVMEnable;
>>> + CalculateVMRowAndSwath_params->HostVMEnable = mode_lib-
>>>> ms.cache_display_cfg.plane.HostVMEnable;
>>> + CalculateVMRowAndSwath_params->HostVMMaxNonCachedPageTableLevels
>>> = mode_lib->ms.cache_display_cfg.plane.HostVMMaxPageTableLevels;
>>> + CalculateVMRowAndSwath_params->GPUVMMaxPageTableLevels =
>>> mode_lib->ms.cache_display_cfg.plane.GPUVMMaxPageTableLevels;
>>> + CalculateVMRowAndSwath_params->GPUVMMinPageSizeKBytes = mode_lib-
>>>> ms.cache_display_cfg.plane.GPUVMMinPageSizeKBytes;
>>> + CalculateVMRowAndSwath_params->HostVMMinPageSize = mode_lib-
>>>> ms.soc.hostvm_min_page_size_kbytes * 1024;
>>> + CalculateVMRowAndSwath_params->PTEBufferModeOverrideEn =
>>> mode_lib->ms.cache_display_cfg.plane.PTEBufferModeOverrideEn;
>>> + CalculateVMRowAndSwath_params->PTEBufferModeOverrideVal =
>>> mode_lib->ms.cache_display_cfg.plane.PTEBufferMode;
>>> + CalculateVMRowAndSwath_params->PTEBufferSizeNotExceeded =
>>> mode_lib->ms.PTEBufferSizeNotExceededPerState;
>>> + CalculateVMRowAndSwath_params->DCCMetaBufferSizeNotExceeded =
>>> mode_lib->ms.DCCMetaBufferSizeNotExceededPerState;
>>> + CalculateVMRowAndSwath_params->dpte_row_width_luma_ub = s-
>>>> dummy_integer_array[0];
>>> + CalculateVMRowAndSwath_params->dpte_row_width_chroma_ub = s-
>>>> dummy_integer_array[1];
>>> + CalculateVMRowAndSwath_params->dpte_row_height_luma = mode_lib-
>>>> ms.dpte_row_height;
>>> + CalculateVMRowAndSwath_params->dpte_row_height_chroma = mode_lib-
>>>> ms.dpte_row_height_chroma;
>>> + CalculateVMRowAndSwath_params->dpte_row_height_linear_luma = s-
>>>> dummy_integer_array[2]; // VBA_DELTA
>>> + CalculateVMRowAndSwath_params->dpte_row_height_linear_chroma = s-
>>>> dummy_integer_array[3]; // VBA_DELTA
>>> + CalculateVMRowAndSwath_params->meta_req_width = s-
>>>> dummy_integer_array[4];
>>> + CalculateVMRowAndSwath_params->meta_req_width_chroma = s-
>>>> dummy_integer_array[5];
>>> + CalculateVMRowAndSwath_params->meta_req_height = s-
>>>> dummy_integer_array[6];
>>> + CalculateVMRowAndSwath_params->meta_req_height_chroma = s-
>>>> dummy_integer_array[7];
>>> + CalculateVMRowAndSwath_params->meta_row_width = s-
>>>> dummy_integer_array[8];
>>> + CalculateVMRowAndSwath_params->meta_row_width_chroma = s-
>>>> dummy_integer_array[9];
>>> + CalculateVMRowAndSwath_params->meta_row_height = mode_lib-
>>>> ms.meta_row_height;
>>> + CalculateVMRowAndSwath_params->meta_row_height_chroma = mode_lib-
>>>> ms.meta_row_height_chroma;
>>> + CalculateVMRowAndSwath_params->vm_group_bytes = s-
>>>> dummy_integer_array[10];
>>> + CalculateVMRowAndSwath_params->dpte_group_bytes = mode_lib-
>>>> ms.dpte_group_bytes;
>>> + CalculateVMRowAndSwath_params->PixelPTEReqWidthY = s-
>>>> dummy_integer_array[11];
>>> + CalculateVMRowAndSwath_params->PixelPTEReqHeightY = s-
>>>> dummy_integer_array[12];
>>> + CalculateVMRowAndSwath_params->PTERequestSizeY = s-
>>>> dummy_integer_array[13];
>>> + CalculateVMRowAndSwath_params->PixelPTEReqWidthC = s-
>>>> dummy_integer_array[14];
>>> + CalculateVMRowAndSwath_params->PixelPTEReqHeightC = s-
>>>> dummy_integer_array[15];
>>> + CalculateVMRowAndSwath_params->PTERequestSizeC = s-
>>>> dummy_integer_array[16];
>>> + CalculateVMRowAndSwath_params->dpde0_bytes_per_frame_ub_l = s-
>>>> dummy_integer_array[17];
>>> + CalculateVMRowAndSwath_params->meta_pte_bytes_per_frame_ub_l = s-
>>>> dummy_integer_array[18];
>>> + CalculateVMRowAndSwath_params->dpde0_bytes_per_frame_ub_c = s-
>>>> dummy_integer_array[19];
>>> + CalculateVMRowAndSwath_params->meta_pte_bytes_per_frame_ub_c = s-
>>>> dummy_integer_array[20];
>>> + CalculateVMRowAndSwath_params->PrefetchSourceLinesY = mode_lib-
>>>> ms.PrefetchLinesYThisState;
>>> + CalculateVMRowAndSwath_params->PrefetchSourceLinesC = mode_lib-
>>>> ms.PrefetchLinesCThisState;
>>> + CalculateVMRowAndSwath_params->VInitPreFillY = mode_lib-
>>>> ms.PrefillY;
>>> + CalculateVMRowAndSwath_params->VInitPreFillC = mode_lib-
>>>> ms.PrefillC;
>>> + CalculateVMRowAndSwath_params->MaxNumSwathY = mode_lib-
>>>> ms.MaxNumSwY;
>>> + CalculateVMRowAndSwath_params->MaxNumSwathC = mode_lib-
>>>> ms.MaxNumSwC;
>>> + CalculateVMRowAndSwath_params->meta_row_bw = mode_lib-
>>>> ms.meta_row_bandwidth_this_state;
>>> + CalculateVMRowAndSwath_params->dpte_row_bw = mode_lib-
>>>> ms.dpte_row_bandwidth_this_state;
>>> + CalculateVMRowAndSwath_params->PixelPTEBytesPerRow = mode_lib-
>>>> ms.DPTEBytesPerRowThisState;
>>> + CalculateVMRowAndSwath_params->PDEAndMetaPTEBytesFrame =
>>> mode_lib->ms.PDEAndMetaPTEBytesPerFrameThisState;
>>> + CalculateVMRowAndSwath_params->MetaRowByte = mode_lib-
>>>> ms.MetaRowBytesThisState;
>>> + CalculateVMRowAndSwath_params->use_one_row_for_frame = mode_lib-
>>>> ms.use_one_row_for_frame_this_state;
>>> + CalculateVMRowAndSwath_params->use_one_row_for_frame_flip =
>>> mode_lib->ms.use_one_row_for_frame_flip_this_state;
>>> + CalculateVMRowAndSwath_params->UsesMALLForStaticScreen = s-
>>>> dummy_boolean_array[0];
>>> + CalculateVMRowAndSwath_params->PTE_BUFFER_MODE = s-
>>>> dummy_boolean_array[1];
>>> + CalculateVMRowAndSwath_params->BIGK_FRAGMENT_SIZE = s-
>>>> dummy_integer_array[21];
>>> +}
>>> +
>>> /// @brief The Mode Support function.
>>> dml_bool_t dml_core_mode_support(struct display_mode_lib_st *mode_lib)
>>> {
>>> @@ -7683,69 +7753,7 @@ dml_bool_t dml_core_mode_support(struct
>>> display_mode_lib_st *mode_lib)
>>> s->SurfParameters[k].SwathHeightC = mode_lib-
>>>> ms.SwathHeightCThisState[k];
>>> }
>>> - CalculateVMRowAndSwath_params->NumberOfActiveSurfaces =
>>> mode_lib->ms.num_active_planes;
>>> - CalculateVMRowAndSwath_params->myPipe = s->SurfParameters;
>>> - CalculateVMRowAndSwath_params->SurfaceSizeInMALL = mode_lib-
>>>> ms.SurfaceSizeInMALL;
>>> - CalculateVMRowAndSwath_params->PTEBufferSizeInRequestsLuma =
>>> mode_lib->ms.ip.dpte_buffer_size_in_pte_reqs_luma;
>>> - CalculateVMRowAndSwath_params->PTEBufferSizeInRequestsChroma
>>> = mode_lib->ms.ip.dpte_buffer_size_in_pte_reqs_chroma;
>>> - CalculateVMRowAndSwath_params->DCCMetaBufferSizeBytes =
>>> mode_lib->ms.ip.dcc_meta_buffer_size_bytes;
>>> - CalculateVMRowAndSwath_params->UseMALLForStaticScreen =
>>> mode_lib->ms.cache_display_cfg.plane.UseMALLForStaticScreen;
>>> - CalculateVMRowAndSwath_params->UseMALLForPStateChange =
>>> mode_lib->ms.cache_display_cfg.plane.UseMALLForPStateChange;
>>> - CalculateVMRowAndSwath_params->MALLAllocatedForDCN =
>>> mode_lib->ms.soc.mall_allocated_for_dcn_mbytes;
>>> - CalculateVMRowAndSwath_params->SwathWidthY = mode_lib-
>>>> ms.SwathWidthYThisState;
>>> - CalculateVMRowAndSwath_params->SwathWidthC = mode_lib-
>>>> ms.SwathWidthCThisState;
>>> - CalculateVMRowAndSwath_params->GPUVMEnable = mode_lib-
>>>> ms.cache_display_cfg.plane.GPUVMEnable;
>>> - CalculateVMRowAndSwath_params->HostVMEnable = mode_lib-
>>>> ms.cache_display_cfg.plane.HostVMEnable;
>>> - CalculateVMRowAndSwath_params-
>>>> HostVMMaxNonCachedPageTableLevels = mode_lib-
>>>> ms.cache_display_cfg.plane.HostVMMaxPageTableLevels;
>>> - CalculateVMRowAndSwath_params->GPUVMMaxPageTableLevels =
>>> mode_lib->ms.cache_display_cfg.plane.GPUVMMaxPageTableLevels;
>>> - CalculateVMRowAndSwath_params->GPUVMMinPageSizeKBytes =
>>> mode_lib->ms.cache_display_cfg.plane.GPUVMMinPageSizeKBytes;
>>> - CalculateVMRowAndSwath_params->HostVMMinPageSize = mode_lib-
>>>> ms.soc.hostvm_min_page_size_kbytes * 1024;
>>> - CalculateVMRowAndSwath_params->PTEBufferModeOverrideEn =
>>> mode_lib->ms.cache_display_cfg.plane.PTEBufferModeOverrideEn;
>>> - CalculateVMRowAndSwath_params->PTEBufferModeOverrideVal =
>>> mode_lib->ms.cache_display_cfg.plane.PTEBufferMode;
>>> - CalculateVMRowAndSwath_params->PTEBufferSizeNotExceeded =
>>> mode_lib->ms.PTEBufferSizeNotExceededPerState;
>>> - CalculateVMRowAndSwath_params->DCCMetaBufferSizeNotExceeded =
>>> mode_lib->ms.DCCMetaBufferSizeNotExceededPerState;
>>> - CalculateVMRowAndSwath_params->dpte_row_width_luma_ub = s-
>>>> dummy_integer_array[0];
>>> - CalculateVMRowAndSwath_params->dpte_row_width_chroma_ub = s-
>>>> dummy_integer_array[1];
>>> - CalculateVMRowAndSwath_params->dpte_row_height_luma =
>>> mode_lib->ms.dpte_row_height;
>>> - CalculateVMRowAndSwath_params->dpte_row_height_chroma =
>>> mode_lib->ms.dpte_row_height_chroma;
>>> - CalculateVMRowAndSwath_params->dpte_row_height_linear_luma =
>>> s->dummy_integer_array[2]; // VBA_DELTA
>>> - CalculateVMRowAndSwath_params->dpte_row_height_linear_chroma
>>> = s->dummy_integer_array[3]; // VBA_DELTA
>>> - CalculateVMRowAndSwath_params->meta_req_width = s-
>>>> dummy_integer_array[4];
>>> - CalculateVMRowAndSwath_params->meta_req_width_chroma = s-
>>>> dummy_integer_array[5];
>>> - CalculateVMRowAndSwath_params->meta_req_height = s-
>>>> dummy_integer_array[6];
>>> - CalculateVMRowAndSwath_params->meta_req_height_chroma = s-
>>>> dummy_integer_array[7];
>>> - CalculateVMRowAndSwath_params->meta_row_width = s-
>>>> dummy_integer_array[8];
>>> - CalculateVMRowAndSwath_params->meta_row_width_chroma = s-
>>>> dummy_integer_array[9];
>>> - CalculateVMRowAndSwath_params->meta_row_height = mode_lib-
>>>> ms.meta_row_height;
>>> - CalculateVMRowAndSwath_params->meta_row_height_chroma =
>>> mode_lib->ms.meta_row_height_chroma;
>>> - CalculateVMRowAndSwath_params->vm_group_bytes = s-
>>>> dummy_integer_array[10];
>>> - CalculateVMRowAndSwath_params->dpte_group_bytes = mode_lib-
>>>> ms.dpte_group_bytes;
>>> - CalculateVMRowAndSwath_params->PixelPTEReqWidthY = s-
>>>> dummy_integer_array[11];
>>> - CalculateVMRowAndSwath_params->PixelPTEReqHeightY = s-
>>>> dummy_integer_array[12];
>>> - CalculateVMRowAndSwath_params->PTERequestSizeY = s-
>>>> dummy_integer_array[13];
>>> - CalculateVMRowAndSwath_params->PixelPTEReqWidthC = s-
>>>> dummy_integer_array[14];
>>> - CalculateVMRowAndSwath_params->PixelPTEReqHeightC = s-
>>>> dummy_integer_array[15];
>>> - CalculateVMRowAndSwath_params->PTERequestSizeC = s-
>>>> dummy_integer_array[16];
>>> - CalculateVMRowAndSwath_params->dpde0_bytes_per_frame_ub_l =
>>> s->dummy_integer_array[17];
>>> - CalculateVMRowAndSwath_params->meta_pte_bytes_per_frame_ub_l
>>> = s->dummy_integer_array[18];
>>> - CalculateVMRowAndSwath_params->dpde0_bytes_per_frame_ub_c =
>>> s->dummy_integer_array[19];
>>> - CalculateVMRowAndSwath_params->meta_pte_bytes_per_frame_ub_c
>>> = s->dummy_integer_array[20];
>>> - CalculateVMRowAndSwath_params->PrefetchSourceLinesY =
>>> mode_lib->ms.PrefetchLinesYThisState;
>>> - CalculateVMRowAndSwath_params->PrefetchSourceLinesC =
>>> mode_lib->ms.PrefetchLinesCThisState;
>>> - CalculateVMRowAndSwath_params->VInitPreFillY = mode_lib-
>>>> ms.PrefillY;
>>> - CalculateVMRowAndSwath_params->VInitPreFillC = mode_lib-
>>>> ms.PrefillC;
>>> - CalculateVMRowAndSwath_params->MaxNumSwathY = mode_lib-
>>>> ms.MaxNumSwY;
>>> - CalculateVMRowAndSwath_params->MaxNumSwathC = mode_lib-
>>>> ms.MaxNumSwC;
>>> - CalculateVMRowAndSwath_params->meta_row_bw = mode_lib-
>>>> ms.meta_row_bandwidth_this_state;
>>> - CalculateVMRowAndSwath_params->dpte_row_bw = mode_lib-
>>>> ms.dpte_row_bandwidth_this_state;
>>> - CalculateVMRowAndSwath_params->PixelPTEBytesPerRow =
>>> mode_lib->ms.DPTEBytesPerRowThisState;
>>> - CalculateVMRowAndSwath_params->PDEAndMetaPTEBytesFrame =
>>> mode_lib->ms.PDEAndMetaPTEBytesPerFrameThisState;
>>> - CalculateVMRowAndSwath_params->MetaRowByte = mode_lib-
>>>> ms.MetaRowBytesThisState;
>>> - CalculateVMRowAndSwath_params->use_one_row_for_frame =
>>> mode_lib->ms.use_one_row_for_frame_this_state;
>>> - CalculateVMRowAndSwath_params->use_one_row_for_frame_flip =
>>> mode_lib->ms.use_one_row_for_frame_flip_this_state;
>>> - CalculateVMRowAndSwath_params->UsesMALLForStaticScreen = s-
>>>> dummy_boolean_array[0];
>>> - CalculateVMRowAndSwath_params->PTE_BUFFER_MODE = s-
>>>> dummy_boolean_array[1];
>>> - CalculateVMRowAndSwath_params->BIGK_FRAGMENT_SIZE = s-
>>>> dummy_integer_array[21];
>>> + set_vm_row_and_swath_parameters(mode_lib);
>>> CalculateVMRowAndSwath(&mode_lib->scratch,
>>> CalculateVMRowAndSwath_params);
>>
>
next prev parent reply other threads:[~2025-12-03 9:42 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-02 10:21 [PATCH 0/6] DC Patches Dec 08 2025 Chenyu Chen
2025-12-02 10:21 ` [PATCH 1/6] drm/amd/display: Defer transitions from minimal state to final state Chenyu Chen
2025-12-02 10:21 ` [PATCH 2/6] drm/amd/display: Remove periodic detection callbacks from dcn35+ Chenyu Chen
2025-12-02 10:21 ` [PATCH 3/6] drm/amd/display: Fixes for S0i3 exit Chenyu Chen
2025-12-02 10:21 ` [PATCH 4/6] drm/amd/display: Refactor dml_core_mode_support to reduce stack frame Chenyu Chen
2025-12-02 16:29 ` Alex Hung
2025-12-02 16:31 ` Alex Hung
2025-12-03 9:42 ` Chen, Chen-Yu [this message]
2025-12-02 10:21 ` [PATCH 5/6] drm/amd/display: Additional info from DML for DMU Chenyu Chen
2025-12-02 10:21 ` [PATCH 6/6] drm/amd/display: Promote DC to 3.2.362 Chenyu Chen
2025-12-08 13:58 ` [PATCH 0/6] DC Patches Dec 08 2025 Wheeler, Daniel
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