Re: [PATCH] drm/amdgpu/display: reduce stack size in dml32_ModeSupportAndSystemConfigurationFull()

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Alex

On Wed, Jun 22, 2022 at 10:48 AM Alex Deucher <alexander.deucher@xxxxxxx> wrote:
>
> Move more stack variable in to dummy vars structure on the heap.
>
> Fixes stack frame size errors:
> drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn32/display_mode_vba_32.c: In function 'dml32_ModeSupportAndSystemConfigurationFull':
> drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn32/display_mode_vba_32.c:3833:1: error: the frame size of 2720 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]
>  3833 | } // ModeSupportAndSystemConfigurationFull
>       | ^
>
> Fixes: dda4fb85e433 ("drm/amd/display: DML changes for DCN32/321")
> Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
> Cc: Aurabindo Pillai <aurabindo.pillai@xxxxxxx>
> Cc: Rodrigo Siqueira Jordao <Rodrigo.Siqueira@xxxxxxx>
> Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
> ---
>  .../dc/dml/dcn32/display_mode_vba_32.c        | 77 ++++++++-----------
>  .../drm/amd/display/dc/dml/display_mode_vba.h |  3 +-
>  2 files changed, 36 insertions(+), 44 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_32.c b/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_32.c
> index 510b7a81ee12..7f144adb1e36 100644
> --- a/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_32.c
> +++ b/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_32.c
> @@ -1660,8 +1660,7 @@ static void DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerforman
>
>  void dml32_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_lib)
>  {
> -       bool dummy_boolean[2];
> -       unsigned int dummy_integer[1];
> +       unsigned int dummy_integer[4];
>         bool MPCCombineMethodAsNeededForPStateChangeAndVoltage;
>         bool MPCCombineMethodAsPossible;
>         enum odm_combine_mode dummy_odm_mode[DC__NUM_DPP__MAX];
> @@ -1973,10 +1972,10 @@ void dml32_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_l
>                         v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[5], /* Long            DETBufferSizeInKByte[]  */
>                         v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[6], /* Long            DETBufferSizeY[]  */
>                         v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[7], /* Long            DETBufferSizeC[]  */
> -                       &dummy_boolean[0], /* bool           *UnboundedRequestEnabled  */
> -                       &dummy_integer[0], /* Long           *CompressedBufferSizeInkByte  */
> +                       &v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_boolean_array[0][0], /* bool           *UnboundedRequestEnabled  */
> +                       &v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[0][0], /* Long           *CompressedBufferSizeInkByte  */
>                         mode_lib->vba.SingleDPPViewportSizeSupportPerSurface,/* bool ViewportSizeSupportPerSurface[] */
> -                       &dummy_boolean[1]); /* bool           *ViewportSizeSupport */
> +                       &v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_boolean_array[1][0]); /* bool           *ViewportSizeSupport */
>
>         MPCCombineMethodAsNeededForPStateChangeAndVoltage = false;
>         MPCCombineMethodAsPossible = false;
> @@ -2506,7 +2505,6 @@ void dml32_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_l
>         //
>         for (i = 0; i < (int) v->soc.num_states; ++i) {
>                 for (j = 0; j <= 1; ++j) {
> -                       bool dummy_boolean_array[1][DC__NUM_DPP__MAX];
>                         for (k = 0; k < mode_lib->vba.NumberOfActiveSurfaces; ++k) {
>                                 mode_lib->vba.RequiredDPPCLKThisState[k] = mode_lib->vba.RequiredDPPCLK[i][j][k];
>                                 mode_lib->vba.NoOfDPPThisState[k] = mode_lib->vba.NoOfDPP[i][j][k];
> @@ -2570,7 +2568,7 @@ void dml32_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_l
>                                         mode_lib->vba.DETBufferSizeCThisState,
>                                         &mode_lib->vba.UnboundedRequestEnabledThisState,
>                                         &mode_lib->vba.CompressedBufferSizeInkByteThisState,
> -                                       dummy_boolean_array[0],
> +                                       v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_boolean_array[0],
>                                         &mode_lib->vba.ViewportSizeSupport[i][j]);
>
>                         for (k = 0; k < mode_lib->vba.NumberOfActiveSurfaces; ++k) {
> @@ -2708,9 +2706,6 @@ void dml32_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_l
>                         }
>
>                         {
> -                               bool dummy_boolean_array[2][DC__NUM_DPP__MAX];
> -                               unsigned int dummy_integer_array[22][DC__NUM_DPP__MAX];
> -
>                                 dml32_CalculateVMRowAndSwath(
>                                                 mode_lib->vba.NumberOfActiveSurfaces,
>                                                 v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.SurfParameters,
> @@ -2733,32 +2728,32 @@ void dml32_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_l
>                                                 /* Output */
>                                                 mode_lib->vba.PTEBufferSizeNotExceededPerState,
>                                                 mode_lib->vba.DCCMetaBufferSizeNotExceededPerState,
> -                                               dummy_integer_array[0],
> -                                               dummy_integer_array[1],
> +                                               v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[0],
> +                                               v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[1],
>                                                 mode_lib->vba.dpte_row_height,
>                                                 mode_lib->vba.dpte_row_height_chroma,
> -                                               dummy_integer_array[2],
> -                                               dummy_integer_array[3],
> -                                               dummy_integer_array[4],
> -                                               dummy_integer_array[5],
> -                                               dummy_integer_array[6],
> -                                               dummy_integer_array[7],
> -                                               dummy_integer_array[8],
> -                                               dummy_integer_array[9],
> +                                               v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[2],
> +                                               v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[3],
> +                                               v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[4],
> +                                               v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[5],
> +                                               v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[6],
> +                                               v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[7],
> +                                               v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[8],
> +                                               v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[9],
>                                                 mode_lib->vba.meta_row_height,
>                                                 mode_lib->vba.meta_row_height_chroma,
> -                                               dummy_integer_array[10],
> +                                               v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[10],
>                                                 mode_lib->vba.dpte_group_bytes,
> -                                               dummy_integer_array[11],
> -                                               dummy_integer_array[12],
> -                                               dummy_integer_array[13],
> -                                               dummy_integer_array[14],
> -                                               dummy_integer_array[15],
> -                                               dummy_integer_array[16],
> -                                               dummy_integer_array[17],
> -                                               dummy_integer_array[18],
> -                                               dummy_integer_array[19],
> -                                               dummy_integer_array[20],
> +                                               v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[11],
> +                                               v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[12],
> +                                               v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[13],
> +                                               v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[14],
> +                                               v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[15],
> +                                               v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[16],
> +                                               v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[17],
> +                                               v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[18],
> +                                               v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[19],
> +                                               v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[20],
>                                                 mode_lib->vba.PrefetchLinesYThisState,
>                                                 mode_lib->vba.PrefetchLinesCThisState,
>                                                 mode_lib->vba.PrefillY,
> @@ -2772,9 +2767,9 @@ void dml32_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_l
>                                                 mode_lib->vba.MetaRowBytesThisState,
>                                                 mode_lib->vba.use_one_row_for_frame_this_state,
>                                                 mode_lib->vba.use_one_row_for_frame_flip_this_state,
> -                                               dummy_boolean_array[0], // Boolean UsesMALLForStaticScreen[]
> -                                               dummy_boolean_array[1], // Boolean PTE_BUFFER_MODE[]
> -                                               dummy_integer_array[21]); // Long BIGK_FRAGMENT_SIZE[]
> +                                               v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_boolean_array[0], // Boolean UsesMALLForStaticScreen[]
> +                                               v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_boolean_array[1], // Boolean PTE_BUFFER_MODE[]
> +                                               v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_integer_array[21]); // Long BIGK_FRAGMENT_SIZE[]
>                         }
>
>                         for (k = 0; k < mode_lib->vba.NumberOfActiveSurfaces; ++k) {
> @@ -3197,7 +3192,6 @@ void dml32_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_l
>
>                                 for (k = 0; k <= mode_lib->vba.NumberOfActiveSurfaces - 1; k++) {
>                                         DmlPipe myPipe;
> -                                       unsigned int dummy_integer;
>
>                                         mode_lib->vba.TWait = dml32_CalculateTWait(
>                                                         mode_lib->vba.PrefetchModePerState[i][j],
> @@ -3294,7 +3288,7 @@ void dml32_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_l
>                                                         &v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_single[0],         // double *Tdmdl_vm
>                                                         &v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_single[1],         // double *Tdmdl
>                                                         &v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_single[2],         // double *TSetup
> -                                                       &dummy_integer,                                                                     // unsigned int   *VUpdateOffsetPix
> +                                                       &dummy_integer[0],                                                                  // unsigned int   *VUpdateOffsetPix
>                                                         &v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_single[3],         // unsigned int   *VUpdateWidthPix
>                                                         &v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_single[4]);        // unsigned int   *VReadyOffsetPix
>                                 }
> @@ -3323,7 +3317,6 @@ void dml32_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_l
>                                 }
>
>                                 {
> -                                       double dummy_single[2];
>                                         dml32_CalculatePrefetchBandwithSupport(
>                                                         mode_lib->vba.NumberOfActiveSurfaces,
>                                                         mode_lib->vba.ReturnBWPerState[i][j],
> @@ -3346,8 +3339,8 @@ void dml32_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_l
>                                                         mode_lib->vba.UrgentBurstFactorCursorPre,
>
>                                                         /* output */
> -                                                       &dummy_single[0],   // Single  *PrefetchBandwidth
> -                                                       &dummy_single[1],   // Single  *FractionOfUrgentBandwidth
> +                                                       &v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_single[0],   // Single  *PrefetchBandwidth
> +                                                       &v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_single[1],   // Single  *FractionOfUrgentBandwidth
>                                                         &mode_lib->vba.PrefetchSupported[i][j]);
>                                 }
>
> @@ -3457,7 +3450,6 @@ void dml32_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_l
>                                         }
>
>                                         {
> -                                               double dummy_single[2];
>                                                 dml32_CalculateImmediateFlipBandwithSupport(mode_lib->vba.NumberOfActiveSurfaces,
>                                                                 mode_lib->vba.ReturnBWPerState[i][j],
>                                                                 mode_lib->vba.ImmediateFlipRequirement,
> @@ -3480,8 +3472,8 @@ void dml32_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_l
>                                                                 mode_lib->vba.UrgentBurstFactorCursorPre,
>
>                                                                 /* output */
> -                                                               &dummy_single[0], //  Single  *TotalBandwidth
> -                                                               &dummy_single[1], //  Single  *FractionOfUrgentBandwidth
> +                                                               &v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_single[0], //  Single  *TotalBandwidth
> +                                                               &v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.dummy_single[1], //  Single  *FractionOfUrgentBandwidth
>                                                                 &mode_lib->vba.ImmediateFlipSupportedForState[i][j]); // Boolean *ImmediateFlipBandwidthSupport
>                                         }
>
> @@ -3534,7 +3526,6 @@ void dml32_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_l
>                         v->dummy_vars.dml32_ModeSupportAndSystemConfigurationFull.mSOCParameters.SMNLatency = mode_lib->vba.SMNLatency;
>
>                         {
> -                               unsigned int dummy_integer[4];
>                                 dml32_CalculateWatermarksMALLUseAndDRAMSpeedChangeSupport(
>                                                 mode_lib->vba.USRRetrainingRequiredFinal,
>                                                 mode_lib->vba.UsesMALLForPStateChange,
> diff --git a/drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.h b/drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.h
> index 9ad49ad38814..10ff536ef2a4 100644
> --- a/drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.h
> +++ b/drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.h
> @@ -196,7 +196,7 @@ struct DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerformanceCal
>  };
>
>  struct dml32_ModeSupportAndSystemConfigurationFull {
> -       unsigned int dummy_integer_array[8][DC__NUM_DPP__MAX];
> +       unsigned int dummy_integer_array[22][DC__NUM_DPP__MAX];
>         double dummy_double_array[2][DC__NUM_DPP__MAX];
>         DmlPipe SurfParameters[DC__NUM_DPP__MAX];
>         double dummy_single[5];
> @@ -207,6 +207,7 @@ struct dml32_ModeSupportAndSystemConfigurationFull {
>         double DSTYAfterScaler[DC__NUM_DPP__MAX];
>         double DSTXAfterScaler[DC__NUM_DPP__MAX];
>         double MaxTotalVActiveRDBandwidth;
> +       bool dummy_boolean_array[2][DC__NUM_DPP__MAX];
>  };
>
>  struct dummy_vars {
> --
> 2.35.3
>



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