SegmentLinking
diff --git a/‎Configuration/ProcessModifiers/python/trackingIters01_cff.py
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diff --git a/‎Configuration/ProcessModifiers/python/trackingLST_cff.py
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diff --git a/‎Configuration/PyReleaseValidation/README.md
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diff --git a/‎Configuration/PyReleaseValidation/python/relval_Run4.py
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diff --git a/‎Configuration/PyReleaseValidation/python/upgradeWorkflowComponents.py
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diff --git a/‎RecoTracker/ConversionSeedGenerators/python/ConversionStep_cff.py
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diff --git a/‎RecoTracker/FinalTrackSelectors/python/MergeTrackCollections_cff.py
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diff --git a/‎RecoTracker/FinalTrackSelectors/python/earlyGeneralTracks_cfi.py
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diff --git a/‎RecoTracker/IterativeTracking/python/HighPtTripletStep_cff.py
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diff --git a/‎RecoTracker/IterativeTracking/python/LowPtQuadStep_cff.py
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@@ -0,0 +1,4 @@
+import FWCore.ParameterSet.Config as cms
+
+# This modifier sets the iterative tracking to use a minimal set of iterations, first two
+trackingIters01 = cms.Modifier()
@@ -0,0 +1,5 @@
+import FWCore.ParameterSet.Config as cms
+
+# This modifier sets the LST (Phase-2 line segment tracking) used for track building
+trackingLST = cms.Modifier()
+
@@ -65,6 +65,8 @@ The offsets currently in use are:
 * 0.7: trackingMkFit modifier
 * 0.701: DisplacedRegionalStep tracking iteration for Run-3
 * 0.702: trackingMkFit modifier for Phase-2 (initialStep only)
+* 0.703: LST tracking, initialStep+HighPtTripletStep only, on CPU
+* 0.704: LST tracking, initialStep+HighPtTripletStep only, on GPU
 * 0.75: HLT phase-2 timing menu
 * 0.751: HLT phase-2 timing menu Alpaka variant
 * 0.752: HLT phase-2 timing menu ticl_v5 variant
 
@@ -36,6 +36,9 @@
 numWFIB.extend([31234.0]) #Run4D114
 numWFIB.extend([32034.0]) #Run4D115
 
+# Temporary placement for LST workflow to workaround PR conflicts - to be formatted and placed in an upcoming PR
+numWFIB.extend([24834.703,24834.704]) #2026D98 LST tracking (initialStep+HighPtTripletStep only): CPU, GPU
+
 #Additional sample for short matrix and IB
 #Default Phase-2 Det NoPU
 numWFIB.extend([prefixDet+34.911]) #DD4hep XML
 
@@ -490,6 +490,56 @@ def condition_(self, fragment, stepList, key, hasHarvest):
     '--procModifiers': 'trackingMkFitCommon,trackingMkFitInitialStep'
 }
 
+# LST on CPU, initialStep+highPtTripletStep-only tracking-only
+class UpgradeWorkflow_lstOnCPUIters01TrackingOnly(UpgradeWorkflowTracking):
+    def setup__(self, step, stepName, stepDict, k, properties):
+        if 'Reco' in step: stepDict[stepName][k] = merge([self.step3, stepDict[step][k]])
+        elif 'HARVEST' in step: stepDict[stepName][k] = merge([{'-s': 'HARVESTING:@trackingOnlyValidation+@trackingOnlyDQM'}, stepDict[step][k]])
+        elif 'ALCA' in step: stepDict[stepName][k] = None
+    def condition_(self, fragment, stepList, key, hasHarvest):
+        return ('Run4' in key)
+upgradeWFs['lstOnCPUIters01TrackingOnly'] = UpgradeWorkflow_lstOnCPUIters01TrackingOnly(
+    steps = [
+        'RecoGlobal',
+        'HARVESTGlobal',
+        # Add ALCA steps explicitly, so that they can be properly removed
+        'ALCA',
+        'ALCAPhase2'
+    ],
+    PU = [],
+    suffix = '_lstOnCPUIters01TrackingOnly',
+    offset = 0.703,
+)
+upgradeWFs['lstOnCPUIters01TrackingOnly'].step3 = upgradeWFs['trackingOnly'].step3 | {
+    '--procModifiers': 'trackingIters01,trackingLST',
+    '--accelerators' : 'cpu'
+}
+
+# LST on GPU, initialStep+highPtTripletStep-only tracking-only
+class UpgradeWorkflow_lstOnGPUIters01TrackingOnly(UpgradeWorkflowTracking):
+    def setup__(self, step, stepName, stepDict, k, properties):
+        if 'Reco' in step: stepDict[stepName][k] = merge([self.step3, stepDict[step][k]])
+        elif 'HARVEST' in step: stepDict[stepName][k] = merge([{'-s': 'HARVESTING:@trackingOnlyValidation+@trackingOnlyDQM'}, stepDict[step][k]])
+        elif 'ALCA' in step: stepDict[stepName][k] = None
+    def condition_(self, fragment, stepList, key, hasHarvest):
+        return ('Run4' in key)
+upgradeWFs['lstOnGPUIters01TrackingOnly'] = UpgradeWorkflow_lstOnGPUIters01TrackingOnly(
+    steps = [
+        'RecoGlobal',
+        'HARVESTGlobal',
+        # Add ALCA steps explicitly, so that they can be properly removed
+        'ALCA',
+        'ALCAPhase2'
+    ],
+    PU = [],
+    suffix = '_lstOnGPUIters01TrackingOnly',
+    offset = 0.704,
+)
+upgradeWFs['lstOnGPUIters01TrackingOnly'].step3 = upgradeWFs['trackingOnly'].step3 | {
+    '--procModifiers': 'trackingIters01,trackingLST',
+    '--accelerators' : 'gpu-*'
+}
+
 #DeepCore seeding for JetCore iteration workflow
 class UpgradeWorkflow_seedingDeepCore(UpgradeWorkflow):
     def setup_(self, step, stepName, stepDict, k, properties):
 
@@ -33,6 +33,16 @@
     oldClusterRemovalInfo                    = 'detachedQuadStepClusters',
     overrideTrkQuals                         = 'detachedQuadStepSelector:detachedQuadStepTrk'
 ))
+from Configuration.ProcessModifiers.trackingIters01_cff import trackingIters01
+trackingIters01.toModify(convClusters,
+                         trajectories          = "highPtTripletStepTracks",
+                         oldClusterRemovalInfo = "highPtTripletStepClusters",
+                         overrideTrkQuals      = "highPtTripletStepSelector:highPtTripletStep"
+)
+from Configuration.ProcessModifiers.trackingLST_cff import trackingLST
+(trackingIters01 & trackingPhase2PU140 & trackingLST).toModify(convClusters,
+                         overrideTrkQuals      = ""
+)
 
 _convLayerPairsStripOnlyLayers = ['TIB1+TID1_pos', 
                                  'TIB1+TID1_neg', 
 
@@ -17,6 +17,8 @@
     ttrhBuilderName   = "WithAngleAndTemplate",
     chi2EstimatorName = "duplicateTrackCandidatesChi2Est"
 )
+from Configuration.ProcessModifiers.trackingIters01_cff import trackingIters01
+trackingIters01.toModify(duplicateTrackCandidates, source = "earlyGeneralTracks")
 
 import RecoTracker.TrackProducer.TrackProducer_cfi
 mergedDuplicateTracks = RecoTracker.TrackProducer.TrackProducer_cfi.TrackProducer.clone(
@@ -44,6 +46,10 @@
     candidateSource     = "duplicateTrackCandidates:candidates",
     candidateComponents = "duplicateTrackCandidates:candidateMap"
 )
+trackingIters01.toModify(generalTracks,
+                         originalSource = "earlyGeneralTracks",
+                         originalMVAVals = "earlyGeneralTracks:MVAValues"
+)
 
 generalTracksTask = cms.Task(
     duplicateTrackCandidates,
 
@@ -109,6 +109,16 @@ def _extend_displacedGeneral(x):
     makeReKeyedSeeds = cms.untracked.bool(False)
     )
 )
+from Configuration.ProcessModifiers.trackingIters01_cff import trackingIters01
+trackingIters01.toModify(earlyGeneralTracks,
+                         TrackProducers = ['initialStepTracks', 'highPtTripletStepTracks'],
+                         hasSelector = [1,1],
+                         indivShareFrac = [1,0.16],
+                         selectedTrackQuals = ['initialStepSelector:initialStep',
+                                               'highPtTripletStepSelector:highPtTripletStep'
+                         ],
+                         setsToMerge = {0: dict(tLists = [0,1])}
+)
 from Configuration.ProcessModifiers.vectorHits_cff import vectorHits
 def _extend_pixelLess(x):
     x.TrackProducers += ['pixelLessStepTracks']
@@ -118,3 +128,13 @@ def _extend_pixelLess(x):
     x.setsToMerge[0].tLists += [6]
 (trackingPhase2PU140 & vectorHits).toModify(earlyGeneralTracks, _extend_pixelLess)
 
+from Configuration.ProcessModifiers.trackingLST_cff import trackingLST
+(trackingPhase2PU140 & trackingLST).toModify(earlyGeneralTracks,
+                         TrackProducers = ['highPtTripletStepLSTpTracks', 'highPtTripletStepLSTT5Tracks'],
+                         hasSelector = [1,0],
+                         indivShareFrac = [0.1,0.1],
+                         selectedTrackQuals = ['highPtTripletStepSelector:highPtTripletStep',
+                                               'highPtTripletStepSelectorLSTT5:highPtTripletStepLSTT5'
+                         ],
+                         setsToMerge = {0: dict(tLists = [0,1])}
+)
@@ -259,6 +259,10 @@
     phase2clustersToSkip = 'highPtTripletStepClusters'
 )
 
+from Configuration.ProcessModifiers.trackingLST_cff import trackingLST
+from RecoTracker.LST.lstOutputConverter_cfi import lstOutputConverter as _lstOutputConverter
+(trackingPhase2PU140 & trackingLST).toReplaceWith(highPtTripletStepTrackCandidates, _lstOutputConverter.clone())
+
 #For FastSim phase1 tracking 
 import FastSimulation.Tracking.TrackCandidateProducer_cfi
 _fastSim_highPtTripletStepTrackCandidates = FastSimulation.Tracking.TrackCandidateProducer_cfi.trackCandidateProducer.clone(
@@ -280,6 +284,25 @@
 from Configuration.Eras.Modifier_phase2_timing_layer_cff import phase2_timing_layer
 phase2_timing_layer.toModify(highPtTripletStepTracks, TrajectoryInEvent = True)
 
+highPtTripletStepLSTpTracks = highPtTripletStepTracks.clone(
+     src           = 'highPtTripletStepTrackCandidates:pTCsLST'
+)
+highPtTripletStepLSTT5Tracks = highPtTripletStepTracks.clone(
+     src           = 'highPtTripletStepTrackCandidates:t5TCsLST'
+)
+_highPtTripletStepTracks_LST = RecoTracker.FinalTrackSelectors.trackListMerger_cfi.trackListMerger.clone(
+    TrackProducers     = ['highPtTripletStepLSTpTracks',
+                          'highPtTripletStepLSTT5Tracks'],
+    hasSelector        = [1,0],
+    indivShareFrac     = [0.1,0.1],
+    selectedTrackQuals = ['highPtTripletStepSelector:highPtTripletStep',
+                          'highPtTripletStepSelectorLSTT5:highPtTripletStepLSTT5'],
+    copyExtras         = True,
+    copyMVA            = False,
+    setsToMerge        = [cms.PSet( tLists=cms.vint32(0,1), pQual=cms.bool(True) )]
+)
+(trackingPhase2PU140 & trackingLST).toReplaceWith(highPtTripletStepTracks, _highPtTripletStepTracks_LST)
+
 # Final selection
 from RecoTracker.FinalTrackSelectors.TrackMVAClassifierPrompt_cfi import *
 highPtTripletStep = TrackMVAClassifierPrompt.clone(
@@ -357,6 +380,28 @@
 from Configuration.ProcessModifiers.vectorHits_cff import vectorHits
 vectorHits.toModify(highPtTripletStepSelector.trackSelectors[2], minNumberLayers = 3, minNumber3DLayers = 3, d0_par1 = ( 0.5, 4.0 ), dz_par1 = ( 0.6, 4.0 ))
 
+(trackingPhase2PU140 & trackingLST).toModify(highPtTripletStepSelector, src = 'highPtTripletStepLSTpTracks')
+# Passthrough selector to satisfy the TrackListMerger requirement for selector values
+highPtTripletStepSelectorLSTT5 = RecoTracker.FinalTrackSelectors.multiTrackSelector_cfi.multiTrackSelector.clone(
+    src = 'highPtTripletStepLSTT5Tracks',
+    trackSelectors = [
+        RecoTracker.FinalTrackSelectors.multiTrackSelector_cfi.looseMTS.clone(
+            name = 'highPtTripletStepLSTT5Loose',
+            minHitsToBypassChecks = 0
+            ), #end of pset
+        RecoTracker.FinalTrackSelectors.multiTrackSelector_cfi.tightMTS.clone(
+            name = 'highPtTripletStepLSTT5Tight',
+            preFilterName = 'highPtTripletStepLSTT5Loose',
+            minHitsToBypassChecks = 0
+            ),
+        RecoTracker.FinalTrackSelectors.multiTrackSelector_cfi.highpurityMTS.clone(
+            name = 'highPtTripletStepLSTT5',
+            preFilterName = 'highPtTripletStepLSTT5Tight',
+            minHitsToBypassChecks = 0
+            ),
+    ] #end of vpset
+) #end of clone
+
 # Final sequence
 HighPtTripletStepTask = cms.Task(highPtTripletStepClusters,
                                  highPtTripletStepSeedLayers,
@@ -378,6 +423,17 @@
 _HighPtTripletStep_Phase2PU140 = cms.Sequence(_HighPtTripletStepTask_Phase2PU140)
 trackingPhase2PU140.toReplaceWith(HighPtTripletStepTask, _HighPtTripletStepTask_Phase2PU140)
 
+_HighPtTripletStepTask_LST = HighPtTripletStepTask.copy()
+from RecoLocalTracker.Phase2TrackerRecHits.Phase2TrackerRecHits_cfi import siPhase2RecHits
+from RecoTracker.LST.lstSeedTracks_cff import lstInitialStepSeedTracks,lstHighPtTripletStepSeedTracks
+from RecoTracker.LST.lstPixelSeedInputProducer_cfi import lstPixelSeedInputProducer
+from RecoTracker.LST.lstPhase2OTHitsInputProducer_cfi import lstPhase2OTHitsInputProducer
+from RecoTracker.LST.lstProducerTask_cff import *
+
+_HighPtTripletStepTask_LST.add(siPhase2RecHits, lstInitialStepSeedTracks, lstHighPtTripletStepSeedTracks, lstPixelSeedInputProducer, lstPhase2OTHitsInputProducer,
+                               lstProducerTask, highPtTripletStepLSTpTracks, highPtTripletStepLSTT5Tracks, highPtTripletStepSelectorLSTT5)
+(trackingPhase2PU140 & trackingLST).toReplaceWith(HighPtTripletStepTask, _HighPtTripletStepTask_LST)
+
 # fast tracking mask producer 
 from FastSimulation.Tracking.FastTrackerRecHitMaskProducer_cfi import maskProducerFromClusterRemover
 highPtTripletStepMasks = maskProducerFromClusterRemover(highPtTripletStepClusters)
 
@@ -14,6 +14,9 @@
 for _eraName, _postfix, _era in _cfg.nonDefaultEras():
     _era.toReplaceWith(lowPtQuadStepClusters, _cfg.clusterRemoverForIter('LowPtQuadStep', _eraName, _postfix))
 
+from Configuration.ProcessModifiers.trackingLST_cff import trackingLST
+# with LST, this is the first iteration with proper cluster masking
+trackingLST.toModify(lowPtQuadStepClusters, oldClusterRemovalInfo = "")
 
 # SEEDING LAYERS
 import RecoTracker.TkSeedingLayers.PixelLayerQuadruplets_cfi