drm/amd/display: Reduce stack size for dml31_ModeSupportAndSystemConfigurationFull

Move code using the Pipe struct to a new helper function.

Works around[0] this warning (resulting in failure to build a RHEL debug
kernel with Werror enabled):

../drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn31/display_mode_vba_31.c: In function ‘dml31_ModeSupportAndSystemConfigurationFull’:
../drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn31/display_mode_vba_31.c:5740:1: warning: the frame size of 2144 bytes is larger than 2048 bytes [-Wframe-larger-than=]

The culprit seems to be the Pipe struct, so pull the relevant block out
into its own sub-function. (This is porting
commit a62427ef9b55 ("drm/amd/display: Reduce stack size for dml21_ModeSupportAndSystemConfigurationFull")
from dml31 to dml21)

[0] AFAICT this doesn't actually reduce the total amount of stack which
can be used, just moves some of it from
dml31_ModeSupportAndSystemConfigurationFull to the new helper function,
so the former happens to no longer exceed the limit for a single
function.

Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Michel Dänzer <mdaenzer@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn31/display_mode_vba_31.c b/drivers/gpu/drm/amd/display/dc/dml/dcn31/display_mode_vba_31.c
index 7e937bd..8965f9a 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn31/display_mode_vba_31.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn31/display_mode_vba_31.c
@@ -3949,6 +3949,102 @@ static double TruncToValidBPP(
        return BPP_INVALID;
 }
 
+static noinline void CalculatePrefetchSchedulePerPlane(
+               struct display_mode_lib *mode_lib,
+               double HostVMInefficiencyFactor,
+               int i,
+               unsigned j,
+               unsigned k)
+{
+       struct vba_vars_st *v = &mode_lib->vba;
+       Pipe myPipe;
+
+       myPipe.DPPCLK = v->RequiredDPPCLK[i][j][k];
+       myPipe.DISPCLK = v->RequiredDISPCLK[i][j];
+       myPipe.PixelClock = v->PixelClock[k];
+       myPipe.DCFCLKDeepSleep = v->ProjectedDCFCLKDeepSleep[i][j];
+       myPipe.DPPPerPlane = v->NoOfDPP[i][j][k];
+       myPipe.ScalerEnabled = v->ScalerEnabled[k];
+       myPipe.SourceScan = v->SourceScan[k];
+       myPipe.BlockWidth256BytesY = v->Read256BlockWidthY[k];
+       myPipe.BlockHeight256BytesY = v->Read256BlockHeightY[k];
+       myPipe.BlockWidth256BytesC = v->Read256BlockWidthC[k];
+       myPipe.BlockHeight256BytesC = v->Read256BlockHeightC[k];
+       myPipe.InterlaceEnable = v->Interlace[k];
+       myPipe.NumberOfCursors = v->NumberOfCursors[k];
+       myPipe.VBlank = v->VTotal[k] - v->VActive[k];
+       myPipe.HTotal = v->HTotal[k];
+       myPipe.DCCEnable = v->DCCEnable[k];
+       myPipe.ODMCombineIsEnabled = v->ODMCombineEnablePerState[i][k] == dm_odm_combine_mode_4to1
+               || v->ODMCombineEnablePerState[i][k] == dm_odm_combine_mode_2to1;
+       myPipe.SourcePixelFormat = v->SourcePixelFormat[k];
+       myPipe.BytePerPixelY = v->BytePerPixelY[k];
+       myPipe.BytePerPixelC = v->BytePerPixelC[k];
+       myPipe.ProgressiveToInterlaceUnitInOPP = v->ProgressiveToInterlaceUnitInOPP;
+       v->NoTimeForPrefetch[i][j][k] = CalculatePrefetchSchedule(
+               mode_lib,
+               HostVMInefficiencyFactor,
+               &myPipe,
+               v->DSCDelayPerState[i][k],
+               v->DPPCLKDelaySubtotal + v->DPPCLKDelayCNVCFormater,
+               v->DPPCLKDelaySCL,
+               v->DPPCLKDelaySCLLBOnly,
+               v->DPPCLKDelayCNVCCursor,
+               v->DISPCLKDelaySubtotal,
+               v->SwathWidthYThisState[k] / v->HRatio[k],
+               v->OutputFormat[k],
+               v->MaxInterDCNTileRepeaters,
+               dml_min(v->MaxVStartup, v->MaximumVStartup[i][j][k]),
+               v->MaximumVStartup[i][j][k],
+               v->GPUVMMaxPageTableLevels,
+               v->GPUVMEnable,
+               v->HostVMEnable,
+               v->HostVMMaxNonCachedPageTableLevels,
+               v->HostVMMinPageSize,
+               v->DynamicMetadataEnable[k],
+               v->DynamicMetadataVMEnabled,
+               v->DynamicMetadataLinesBeforeActiveRequired[k],
+               v->DynamicMetadataTransmittedBytes[k],
+               v->UrgLatency[i],
+               v->ExtraLatency,
+               v->TimeCalc,
+               v->PDEAndMetaPTEBytesPerFrame[i][j][k],
+               v->MetaRowBytes[i][j][k],
+               v->DPTEBytesPerRow[i][j][k],
+               v->PrefetchLinesY[i][j][k],
+               v->SwathWidthYThisState[k],
+               v->PrefillY[k],
+               v->MaxNumSwY[k],
+               v->PrefetchLinesC[i][j][k],
+               v->SwathWidthCThisState[k],
+               v->PrefillC[k],
+               v->MaxNumSwC[k],
+               v->swath_width_luma_ub_this_state[k],
+               v->swath_width_chroma_ub_this_state[k],
+               v->SwathHeightYThisState[k],
+               v->SwathHeightCThisState[k],
+               v->TWait,
+               &v->DSTXAfterScaler[k],
+               &v->DSTYAfterScaler[k],
+               &v->LineTimesForPrefetch[k],
+               &v->PrefetchBW[k],
+               &v->LinesForMetaPTE[k],
+               &v->LinesForMetaAndDPTERow[k],
+               &v->VRatioPreY[i][j][k],
+               &v->VRatioPreC[i][j][k],
+               &v->RequiredPrefetchPixelDataBWLuma[i][j][k],
+               &v->RequiredPrefetchPixelDataBWChroma[i][j][k],
+               &v->NoTimeForDynamicMetadata[i][j][k],
+               &v->Tno_bw[k],
+               &v->prefetch_vmrow_bw[k],
+               &v->dummy7[k],
+               &v->dummy8[k],
+               &v->dummy13[k],
+               &v->VUpdateOffsetPix[k],
+               &v->VUpdateWidthPix[k],
+               &v->VReadyOffsetPix[k]);
+}
+
 void dml31_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_lib)
 {
        struct vba_vars_st *v = &mode_lib->vba;
@@ -5276,92 +5372,9 @@ void dml31_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_l
                                                v->SREnterPlusExitTime);
 
                                for (k = 0; k < v->NumberOfActivePlanes; k++) {
-                                       Pipe myPipe;
-
-                                       myPipe.DPPCLK = v->RequiredDPPCLK[i][j][k];
-                                       myPipe.DISPCLK = v->RequiredDISPCLK[i][j];
-                                       myPipe.PixelClock = v->PixelClock[k];
-                                       myPipe.DCFCLKDeepSleep = v->ProjectedDCFCLKDeepSleep[i][j];
-                                       myPipe.DPPPerPlane = v->NoOfDPP[i][j][k];
-                                       myPipe.ScalerEnabled = v->ScalerEnabled[k];
-                                       myPipe.SourceScan = v->SourceScan[k];
-                                       myPipe.BlockWidth256BytesY = v->Read256BlockWidthY[k];
-                                       myPipe.BlockHeight256BytesY = v->Read256BlockHeightY[k];
-                                       myPipe.BlockWidth256BytesC = v->Read256BlockWidthC[k];
-                                       myPipe.BlockHeight256BytesC = v->Read256BlockHeightC[k];
-                                       myPipe.InterlaceEnable = v->Interlace[k];
-                                       myPipe.NumberOfCursors = v->NumberOfCursors[k];
-                                       myPipe.VBlank = v->VTotal[k] - v->VActive[k];
-                                       myPipe.HTotal = v->HTotal[k];
-                                       myPipe.DCCEnable = v->DCCEnable[k];
-                                       myPipe.ODMCombineIsEnabled = v->ODMCombineEnablePerState[i][k] == dm_odm_combine_mode_4to1
-                                                       || v->ODMCombineEnablePerState[i][k] == dm_odm_combine_mode_2to1;
-                                       myPipe.SourcePixelFormat = v->SourcePixelFormat[k];
-                                       myPipe.BytePerPixelY = v->BytePerPixelY[k];
-                                       myPipe.BytePerPixelC = v->BytePerPixelC[k];
-                                       myPipe.ProgressiveToInterlaceUnitInOPP = v->ProgressiveToInterlaceUnitInOPP;
-                                       v->NoTimeForPrefetch[i][j][k] = CalculatePrefetchSchedule(
-                                                       mode_lib,
-                                                       HostVMInefficiencyFactor,
-                                                       &myPipe,
-                                                       v->DSCDelayPerState[i][k],
-                                                       v->DPPCLKDelaySubtotal + v->DPPCLKDelayCNVCFormater,
-                                                       v->DPPCLKDelaySCL,
-                                                       v->DPPCLKDelaySCLLBOnly,
-                                                       v->DPPCLKDelayCNVCCursor,
-                                                       v->DISPCLKDelaySubtotal,
-                                                       v->SwathWidthYThisState[k] / v->HRatio[k],
-                                                       v->OutputFormat[k],
-                                                       v->MaxInterDCNTileRepeaters,
-                                                       dml_min(v->MaxVStartup, v->MaximumVStartup[i][j][k]),
-                                                       v->MaximumVStartup[i][j][k],
-                                                       v->GPUVMMaxPageTableLevels,
-                                                       v->GPUVMEnable,
-                                                       v->HostVMEnable,
-                                                       v->HostVMMaxNonCachedPageTableLevels,
-                                                       v->HostVMMinPageSize,
-                                                       v->DynamicMetadataEnable[k],
-                                                       v->DynamicMetadataVMEnabled,
-                                                       v->DynamicMetadataLinesBeforeActiveRequired[k],
-                                                       v->DynamicMetadataTransmittedBytes[k],
-                                                       v->UrgLatency[i],
-                                                       v->ExtraLatency,
-                                                       v->TimeCalc,
-                                                       v->PDEAndMetaPTEBytesPerFrame[i][j][k],
-                                                       v->MetaRowBytes[i][j][k],
-                                                       v->DPTEBytesPerRow[i][j][k],
-                                                       v->PrefetchLinesY[i][j][k],
-                                                       v->SwathWidthYThisState[k],
-                                                       v->PrefillY[k],
-                                                       v->MaxNumSwY[k],
-                                                       v->PrefetchLinesC[i][j][k],
-                                                       v->SwathWidthCThisState[k],
-                                                       v->PrefillC[k],
-                                                       v->MaxNumSwC[k],
-                                                       v->swath_width_luma_ub_this_state[k],
-                                                       v->swath_width_chroma_ub_this_state[k],
-                                                       v->SwathHeightYThisState[k],
-                                                       v->SwathHeightCThisState[k],
-                                                       v->TWait,
-                                                       &v->DSTXAfterScaler[k],
-                                                       &v->DSTYAfterScaler[k],
-                                                       &v->LineTimesForPrefetch[k],
-                                                       &v->PrefetchBW[k],
-                                                       &v->LinesForMetaPTE[k],
-                                                       &v->LinesForMetaAndDPTERow[k],
-                                                       &v->VRatioPreY[i][j][k],
-                                                       &v->VRatioPreC[i][j][k],
-                                                       &v->RequiredPrefetchPixelDataBWLuma[i][j][k],
-                                                       &v->RequiredPrefetchPixelDataBWChroma[i][j][k],
-                                                       &v->NoTimeForDynamicMetadata[i][j][k],
-                                                       &v->Tno_bw[k],
-                                                       &v->prefetch_vmrow_bw[k],
-                                                       &v->dummy7[k],
-                                                       &v->dummy8[k],
-                                                       &v->dummy13[k],
-                                                       &v->VUpdateOffsetPix[k],
-                                                       &v->VUpdateWidthPix[k],
-                                                       &v->VReadyOffsetPix[k]);
+                                       CalculatePrefetchSchedulePerPlane(mode_lib,
+                                                                         HostVMInefficiencyFactor,
+                                                                         i, j, k);
                                }
 
                                for (k = 0; k < v->NumberOfActivePlanes; k++) {