[PATCH AUTOSEL 5.19 13/16] drm/amd/display: Reduce number of arguments of dml31's CalculateFlipSchedule()

From: Sasha Levin
Date: Wed Sep 21 2022 - 12:07:14 EST

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From: Nathan Chancellor <nathan@xxxxxxxxxx>

[ Upstream commit 21485d3da659b66c37d99071623af83ee1c6733d ]

Most of the arguments are identical between the two call sites and they
can be accessed through the 'struct vba_vars_st' pointer. This reduces
the total amount of stack space that
dml31_ModeSupportAndSystemConfigurationFull() uses by 112 bytes with
LLVM 16 (1976 -> 1864), helping clear up the following clang warning:

drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn31/display_mode_vba_31.c:3908:6: error: stack frame size (2216) exceeds limit (2048) in 'dml31_ModeSupportAndSystemConfigurationFull' [-Werror,-Wframe-larger-than]
void dml31_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_lib)
^
1 error generated.

Link: https://github.com/ClangBuiltLinux/linux/issues/1681
Reported-by: "Sudip Mukherjee (Codethink)" <sudipm.mukherjee@xxxxxxxxx>
Tested-by: Maíra Canal <mairacanal@xxxxxxxxxx>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx>
Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
.../dc/dml/dcn31/display_mode_vba_31.c | 172 +++++-------------
1 file changed, 47 insertions(+), 125 deletions(-)

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 586825d85d66..40a672236198 100644
--- 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
@@ -261,33 +261,13 @@ static void CalculateRowBandwidth(

static void CalculateFlipSchedule(
struct display_mode_lib *mode_lib,
+ unsigned int k,
double HostVMInefficiencyFactor,
double UrgentExtraLatency,
double UrgentLatency,
- unsigned int GPUVMMaxPageTableLevels,
- bool HostVMEnable,
- unsigned int HostVMMaxNonCachedPageTableLevels,
- bool GPUVMEnable,
- double HostVMMinPageSize,
double PDEAndMetaPTEBytesPerFrame,
double MetaRowBytes,
- double DPTEBytesPerRow,
- double BandwidthAvailableForImmediateFlip,
- unsigned int TotImmediateFlipBytes,
- enum source_format_class SourcePixelFormat,
- double LineTime,
- double VRatio,
- double VRatioChroma,
- double Tno_bw,
- bool DCCEnable,
- unsigned int dpte_row_height,
- unsigned int meta_row_height,
- unsigned int dpte_row_height_chroma,
- unsigned int meta_row_height_chroma,
- double *DestinationLinesToRequestVMInImmediateFlip,
- double *DestinationLinesToRequestRowInImmediateFlip,
- double *final_flip_bw,
- bool *ImmediateFlipSupportedForPipe);
+ double DPTEBytesPerRow);
static double CalculateWriteBackDelay(
enum source_format_class WritebackPixelFormat,
double WritebackHRatio,
@@ -2878,33 +2858,13 @@ static void DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerforman
for (k = 0; k < v->NumberOfActivePlanes; ++k) {
CalculateFlipSchedule(
mode_lib,
+ k,
HostVMInefficiencyFactor,
v->UrgentExtraLatency,
v->UrgentLatency,
- v->GPUVMMaxPageTableLevels,
- v->HostVMEnable,
- v->HostVMMaxNonCachedPageTableLevels,
- v->GPUVMEnable,
- v->HostVMMinPageSize,
v->PDEAndMetaPTEBytesFrame[k],
v->MetaRowByte[k],
- v->PixelPTEBytesPerRow[k],
- v->BandwidthAvailableForImmediateFlip,
- v->TotImmediateFlipBytes,
- v->SourcePixelFormat[k],
- v->HTotal[k] / v->PixelClock[k],
- v->VRatio[k],
- v->VRatioChroma[k],
- v->Tno_bw[k],
- v->DCCEnable[k],
- v->dpte_row_height[k],
- v->meta_row_height[k],
- v->dpte_row_height_chroma[k],
- v->meta_row_height_chroma[k],
- &v->DestinationLinesToRequestVMInImmediateFlip[k],
- &v->DestinationLinesToRequestRowInImmediateFlip[k],
- &v->final_flip_bw[k],
- &v->ImmediateFlipSupportedForPipe[k]);
+ v->PixelPTEBytesPerRow[k]);
}

v->total_dcn_read_bw_with_flip = 0.0;
@@ -3624,61 +3584,43 @@ static void CalculateRowBandwidth(

static void CalculateFlipSchedule(
struct display_mode_lib *mode_lib,
+ unsigned int k,
double HostVMInefficiencyFactor,
double UrgentExtraLatency,
double UrgentLatency,
- unsigned int GPUVMMaxPageTableLevels,
- bool HostVMEnable,
- unsigned int HostVMMaxNonCachedPageTableLevels,
- bool GPUVMEnable,
- double HostVMMinPageSize,
double PDEAndMetaPTEBytesPerFrame,
double MetaRowBytes,
- double DPTEBytesPerRow,
- double BandwidthAvailableForImmediateFlip,
- unsigned int TotImmediateFlipBytes,
- enum source_format_class SourcePixelFormat,
- double LineTime,
- double VRatio,
- double VRatioChroma,
- double Tno_bw,
- bool DCCEnable,
- unsigned int dpte_row_height,
- unsigned int meta_row_height,
- unsigned int dpte_row_height_chroma,
- unsigned int meta_row_height_chroma,
- double *DestinationLinesToRequestVMInImmediateFlip,
- double *DestinationLinesToRequestRowInImmediateFlip,
- double *final_flip_bw,
- bool *ImmediateFlipSupportedForPipe)
+ double DPTEBytesPerRow)
{
+ struct vba_vars_st *v = &mode_lib->vba;
double min_row_time = 0.0;
unsigned int HostVMDynamicLevelsTrips;
double TimeForFetchingMetaPTEImmediateFlip;
double TimeForFetchingRowInVBlankImmediateFlip;
double ImmediateFlipBW;
+ double LineTime = v->HTotal[k] / v->PixelClock[k];

- if (GPUVMEnable == true && HostVMEnable == true) {
- HostVMDynamicLevelsTrips = HostVMMaxNonCachedPageTableLevels;
+ if (v->GPUVMEnable == true && v->HostVMEnable == true) {
+ HostVMDynamicLevelsTrips = v->HostVMMaxNonCachedPageTableLevels;
} else {
HostVMDynamicLevelsTrips = 0;
}

- if (GPUVMEnable == true || DCCEnable == true) {
- ImmediateFlipBW = (PDEAndMetaPTEBytesPerFrame + MetaRowBytes + DPTEBytesPerRow) * BandwidthAvailableForImmediateFlip / TotImmediateFlipBytes;
+ if (v->GPUVMEnable == true || v->DCCEnable[k] == true) {
+ ImmediateFlipBW = (PDEAndMetaPTEBytesPerFrame + MetaRowBytes + DPTEBytesPerRow) * v->BandwidthAvailableForImmediateFlip / v->TotImmediateFlipBytes;
}

- if (GPUVMEnable == true) {
+ if (v->GPUVMEnable == true) {
TimeForFetchingMetaPTEImmediateFlip = dml_max3(
- Tno_bw + PDEAndMetaPTEBytesPerFrame * HostVMInefficiencyFactor / ImmediateFlipBW,
- UrgentExtraLatency + UrgentLatency * (GPUVMMaxPageTableLevels * (HostVMDynamicLevelsTrips + 1) - 1),
+ v->Tno_bw[k] + PDEAndMetaPTEBytesPerFrame * HostVMInefficiencyFactor / ImmediateFlipBW,
+ UrgentExtraLatency + UrgentLatency * (v->GPUVMMaxPageTableLevels * (HostVMDynamicLevelsTrips + 1) - 1),
LineTime / 4.0);
} else {
TimeForFetchingMetaPTEImmediateFlip = 0;
}

- *DestinationLinesToRequestVMInImmediateFlip = dml_ceil(4.0 * (TimeForFetchingMetaPTEImmediateFlip / LineTime), 1) / 4.0;
- if ((GPUVMEnable == true || DCCEnable == true)) {
+ v->DestinationLinesToRequestVMInImmediateFlip[k] = dml_ceil(4.0 * (TimeForFetchingMetaPTEImmediateFlip / LineTime), 1) / 4.0;
+ if ((v->GPUVMEnable == true || v->DCCEnable[k] == true)) {
TimeForFetchingRowInVBlankImmediateFlip = dml_max3(
(MetaRowBytes + DPTEBytesPerRow * HostVMInefficiencyFactor) / ImmediateFlipBW,
UrgentLatency * (HostVMDynamicLevelsTrips + 1),
@@ -3687,54 +3629,54 @@ static void CalculateFlipSchedule(
TimeForFetchingRowInVBlankImmediateFlip = 0;
}

- *DestinationLinesToRequestRowInImmediateFlip = dml_ceil(4.0 * (TimeForFetchingRowInVBlankImmediateFlip / LineTime), 1) / 4.0;
+ v->DestinationLinesToRequestRowInImmediateFlip[k] = dml_ceil(4.0 * (TimeForFetchingRowInVBlankImmediateFlip / LineTime), 1) / 4.0;

- if (GPUVMEnable == true) {
- *final_flip_bw = dml_max(
- PDEAndMetaPTEBytesPerFrame * HostVMInefficiencyFactor / (*DestinationLinesToRequestVMInImmediateFlip * LineTime),
- (MetaRowBytes + DPTEBytesPerRow * HostVMInefficiencyFactor) / (*DestinationLinesToRequestRowInImmediateFlip * LineTime));
- } else if ((GPUVMEnable == true || DCCEnable == true)) {
- *final_flip_bw = (MetaRowBytes + DPTEBytesPerRow * HostVMInefficiencyFactor) / (*DestinationLinesToRequestRowInImmediateFlip * LineTime);
+ if (v->GPUVMEnable == true) {
+ v->final_flip_bw[k] = dml_max(
+ PDEAndMetaPTEBytesPerFrame * HostVMInefficiencyFactor / (v->DestinationLinesToRequestVMInImmediateFlip[k] * LineTime),
+ (MetaRowBytes + DPTEBytesPerRow * HostVMInefficiencyFactor) / (v->DestinationLinesToRequestRowInImmediateFlip[k] * LineTime));
+ } else if ((v->GPUVMEnable == true || v->DCCEnable[k] == true)) {
+ v->final_flip_bw[k] = (MetaRowBytes + DPTEBytesPerRow * HostVMInefficiencyFactor) / (v->DestinationLinesToRequestRowInImmediateFlip[k] * LineTime);
} else {
- *final_flip_bw = 0;
+ v->final_flip_bw[k] = 0;
}

- if (SourcePixelFormat == dm_420_8 || SourcePixelFormat == dm_420_10 || SourcePixelFormat == dm_rgbe_alpha) {
- if (GPUVMEnable == true && DCCEnable != true) {
- min_row_time = dml_min(dpte_row_height * LineTime / VRatio, dpte_row_height_chroma * LineTime / VRatioChroma);
- } else if (GPUVMEnable != true && DCCEnable == true) {
- min_row_time = dml_min(meta_row_height * LineTime / VRatio, meta_row_height_chroma * LineTime / VRatioChroma);
+ if (v->SourcePixelFormat[k] == dm_420_8 || v->SourcePixelFormat[k] == dm_420_10 || v->SourcePixelFormat[k] == dm_rgbe_alpha) {
+ if (v->GPUVMEnable == true && v->DCCEnable[k] != true) {
+ min_row_time = dml_min(v->dpte_row_height[k] * LineTime / v->VRatio[k], v->dpte_row_height_chroma[k] * LineTime / v->VRatioChroma[k]);
+ } else if (v->GPUVMEnable != true && v->DCCEnable[k] == true) {
+ min_row_time = dml_min(v->meta_row_height[k] * LineTime / v->VRatio[k], v->meta_row_height_chroma[k] * LineTime / v->VRatioChroma[k]);
} else {
min_row_time = dml_min4(
- dpte_row_height * LineTime / VRatio,
- meta_row_height * LineTime / VRatio,
- dpte_row_height_chroma * LineTime / VRatioChroma,
- meta_row_height_chroma * LineTime / VRatioChroma);
+ v->dpte_row_height[k] * LineTime / v->VRatio[k],
+ v->meta_row_height[k] * LineTime / v->VRatio[k],
+ v->dpte_row_height_chroma[k] * LineTime / v->VRatioChroma[k],
+ v->meta_row_height_chroma[k] * LineTime / v->VRatioChroma[k]);
}
} else {
- if (GPUVMEnable == true && DCCEnable != true) {
- min_row_time = dpte_row_height * LineTime / VRatio;
- } else if (GPUVMEnable != true && DCCEnable == true) {
- min_row_time = meta_row_height * LineTime / VRatio;
+ if (v->GPUVMEnable == true && v->DCCEnable[k] != true) {
+ min_row_time = v->dpte_row_height[k] * LineTime / v->VRatio[k];
+ } else if (v->GPUVMEnable != true && v->DCCEnable[k] == true) {
+ min_row_time = v->meta_row_height[k] * LineTime / v->VRatio[k];
} else {
- min_row_time = dml_min(dpte_row_height * LineTime / VRatio, meta_row_height * LineTime / VRatio);
+ min_row_time = dml_min(v->dpte_row_height[k] * LineTime / v->VRatio[k], v->meta_row_height[k] * LineTime / v->VRatio[k]);
}
}

- if (*DestinationLinesToRequestVMInImmediateFlip >= 32 || *DestinationLinesToRequestRowInImmediateFlip >= 16
+ if (v->DestinationLinesToRequestVMInImmediateFlip[k] >= 32 || v->DestinationLinesToRequestRowInImmediateFlip[k] >= 16
|| TimeForFetchingMetaPTEImmediateFlip + 2 * TimeForFetchingRowInVBlankImmediateFlip > min_row_time) {
- *ImmediateFlipSupportedForPipe = false;
+ v->ImmediateFlipSupportedForPipe[k] = false;
} else {
- *ImmediateFlipSupportedForPipe = true;
+ v->ImmediateFlipSupportedForPipe[k] = true;
}

#ifdef __DML_VBA_DEBUG__
- dml_print("DML::%s: DestinationLinesToRequestVMInImmediateFlip = %f\n", __func__, *DestinationLinesToRequestVMInImmediateFlip);
- dml_print("DML::%s: DestinationLinesToRequestRowInImmediateFlip = %f\n", __func__, *DestinationLinesToRequestRowInImmediateFlip);
+ dml_print("DML::%s: DestinationLinesToRequestVMInImmediateFlip = %f\n", __func__, v->DestinationLinesToRequestVMInImmediateFlip[k]);
+ dml_print("DML::%s: DestinationLinesToRequestRowInImmediateFlip = %f\n", __func__, v->DestinationLinesToRequestRowInImmediateFlip[k]);
dml_print("DML::%s: TimeForFetchingMetaPTEImmediateFlip = %f\n", __func__, TimeForFetchingMetaPTEImmediateFlip);
dml_print("DML::%s: TimeForFetchingRowInVBlankImmediateFlip = %f\n", __func__, TimeForFetchingRowInVBlankImmediateFlip);
dml_print("DML::%s: min_row_time = %f\n", __func__, min_row_time);
- dml_print("DML::%s: ImmediateFlipSupportedForPipe = %d\n", __func__, *ImmediateFlipSupportedForPipe);
+ dml_print("DML::%s: ImmediateFlipSupportedForPipe = %d\n", __func__, v->ImmediateFlipSupportedForPipe[k]);
#endif

}
@@ -5325,33 +5267,13 @@ void dml31_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_l
for (k = 0; k < v->NumberOfActivePlanes; k++) {
CalculateFlipSchedule(
mode_lib,
+ k,
HostVMInefficiencyFactor,
v->ExtraLatency,
v->UrgLatency[i],
- v->GPUVMMaxPageTableLevels,
- v->HostVMEnable,
- v->HostVMMaxNonCachedPageTableLevels,
- v->GPUVMEnable,
- v->HostVMMinPageSize,
v->PDEAndMetaPTEBytesPerFrame[i][j][k],
v->MetaRowBytes[i][j][k],
- v->DPTEBytesPerRow[i][j][k],
- v->BandwidthAvailableForImmediateFlip,
- v->TotImmediateFlipBytes,
- v->SourcePixelFormat[k],
- v->HTotal[k] / v->PixelClock[k],
- v->VRatio[k],
- v->VRatioChroma[k],
- v->Tno_bw[k],
- v->DCCEnable[k],
- v->dpte_row_height[k],
- v->meta_row_height[k],
- v->dpte_row_height_chroma[k],
- v->meta_row_height_chroma[k],
- &v->DestinationLinesToRequestVMInImmediateFlip[k],
- &v->DestinationLinesToRequestRowInImmediateFlip[k],
- &v->final_flip_bw[k],
- &v->ImmediateFlipSupportedForPipe[k]);
+ v->DPTEBytesPerRow[i][j][k]);
}
v->total_dcn_read_bw_with_flip = 0.0;
for (k = 0; k < v->NumberOfActivePlanes; k++) {
--
2.35.1

Next message: Sasha Levin: "[PATCH AUTOSEL 5.19 14/16] drm/amd/display: Mark dml30's UseMinimumDCFCLK() as noinline for stack usage"
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