Fix Blackwell SMEM fragment alignment

src/main/scala/radiance/tile/RadianceTile.scala

@@ -21,7 +21,7 @@ import midas.targetutils.SynthesizePrintf
 import org.chipsalliance.cde.config._
 import radiance.core._
 import radiance.memory._
-import radiance.subsystem.{GPUMemParams, GPUMemory, RadianceSimArgs}
+import radiance.subsystem.{GPUMemParams, GPUMemory, RadianceSharedMemKey, RadianceSimArgs}
 
 /** For determining radiance core id.  This may be different from
  *  RadianceTileParams.tileId, when a cluster contains non-core tiles */
@@ -289,6 +289,11 @@ class RadianceTile private (
   }
 
   val tcSmemSize = numLsuLanes * 4
+  val tcSmemLineSize = p(RadianceSharedMemKey)
+    .map(k => k.numWords * k.wordSize)
+    .getOrElse(tcSmemSize)
+  val tcSmemClientMaxSize =
+    if (radianceParams.core.tensorCoreBlackwell) math.max(tcSmemSize, tcSmemLineSize) else tcSmemSize
   val numTensorWarps = radianceParams.core.numTensorWarps
   val numScalarWarps = numWarps - numTensorWarps
   require(numTensorWarps > 0 && numTensorWarps < numWarps,
@@ -300,6 +305,8 @@ class RadianceTile private (
     require(numLsuLanes == 4 || numLsuLanes == 8,
       s"Wu Blackwell binding supports 4 or 8 lanes, got ${numLsuLanes}")
     require(numTensorCores == numTensorWarps, "Wu Blackwell binding requires one Tensor Core per Tensor warp")
+    require(isPow2(tcSmemLineSize) && tcSmemLineSize >= tcSmemSize && (tcSmemLineSize % tcSmemSize) == 0,
+      s"Wu Blackwell SMEM line size (${tcSmemLineSize}) must be a power-of-two multiple of TC fragment size (${tcSmemSize})")
   }
   val tensorUsesAsyncMem = radianceParams.core.tensorCoreDecoupled || radianceParams.core.tensorCoreBlackwell
   val tcSmemNodeCount = if (radianceParams.core.tensorCoreDecoupled) 2 else if (radianceParams.core.tensorCoreBlackwell) numTensorCores else 0
@@ -309,9 +316,9 @@ class RadianceTile private (
         name = s"rad_tc_${radianceParams.coreId}_$i",
         sourceId = IdRange(0, 1 << smemSourceWidth),
         supports = TLSlaveToMasterTransferSizes(
-          probe = TransferSizes(1, tcSmemSize),
+          probe = TransferSizes(1, tcSmemClientMaxSize),
-          get = TransferSizes(1, tcSmemSize),
+          get = TransferSizes(1, tcSmemClientMaxSize),
-          putFull = TransferSizes(1, tcSmemSize),
+          putFull = TransferSizes(1, tcSmemClientMaxSize),
         ),
         requestFifo = true
       ))
@@ -854,18 +861,24 @@ class RadianceTileModuleImp(outer: RadianceTile)
 
         val nTC = outer.numTensorCores
         val tcPorts = 3
+        val tcCoreDataBits = 32 * 8
         val tcDataBits = outer.tcSmemSize * 8
+        val tcSmemLineBits = outer.tcSmemLineSize * 8
         val tmemAddrBits = 9
         val tmemDataBits = tcDataBits
         val tmemMaskBits = outer.tcSmemSize
         val tcTlSize = log2Ceil(outer.tcSmemSize)
+        val tcSmemLineTlSize = log2Ceil(outer.tcSmemLineSize)
 
         def slice(u: UInt, width: Int, idx: Int): UInt = u(width * (idx + 1) - 1, width * idx)
         def port(tc: Int, p: Int): Int = tc * tcPorts + p
+        def padToCoreData(u: UInt): UInt = {
+          if (u.getWidth == tcCoreDataBits) u else Cat(0.U((tcCoreDataBits - u.getWidth).W), u)
+        }
 
         val tcAReady = Wire(Vec(nTC * tcPorts, Bool()))
         val tcDValid = Wire(Vec(nTC * tcPorts, Bool()))
-        val tcDData = Wire(Vec(nTC * tcPorts, UInt(tcDataBits.W)))
+        val tcDData = Wire(Vec(nTC * tcPorts, UInt(tcCoreDataBits.W)))
         val tcDTag = Wire(Vec(nTC * tcPorts, UInt(outer.tensorTagWidth.W)))
         tcAReady.foreach(_ := false.B)
         tcDValid.foreach(_ := false.B)
@@ -930,27 +943,43 @@ class RadianceTileModuleImp(outer: RadianceTile)
         (0 until nTC).foreach { tc =>
           val p2 = port(tc, 2)
           val client = outer.tcSmemNodes(tc).out.head
+          val rawAddress = slice(core.io.tc_a_bits_address, 32, p2)
+          val lineAddress = rawAddress & (~((outer.tcSmemLineSize - 1).U(32.W))).asUInt
           val adapter = Module(new VortexTLAdapter(
             outer.smemSourceWidth,
-            new VortexBundleA(tagWidth = outer.tensorTagWidth, dataWidth = tcDataBits),
+            new VortexBundleA(tagWidth = outer.tensorTagWidth, dataWidth = tcSmemLineBits),
-            new VortexBundleD(tagWidth = outer.tensorTagWidth, dataWidth = tcDataBits),
+            new VortexBundleD(tagWidth = outer.tensorTagWidth, dataWidth = tcSmemLineBits),
             client
           ))
           adapter.io.inReq.bits <> DontCare
           adapter.io.inReq.valid := core.io.tc_a_valid(p2)
-          adapter.io.inReq.bits.address := slice(core.io.tc_a_bits_address, 32, p2)
+          adapter.io.inReq.bits.address := lineAddress
           adapter.io.inReq.bits.source := slice(core.io.tc_a_bits_tag, outer.tensorTagWidth, p2)
-          adapter.io.inReq.bits.size := tcTlSize.U
+          adapter.io.inReq.bits.size := tcSmemLineTlSize.U
           adapter.io.inReq.bits.opcode := Mux(core.io.tc_a_bits_write(p2).asBool, TLMessages.PutFullData, TLMessages.Get)
-          adapter.io.inReq.bits.mask := slice(core.io.tc_a_bits_mask, 32, p2)
+          adapter.io.inReq.bits.mask := Fill(outer.tcSmemLineSize, 1.U(1.W))
-          adapter.io.inReq.bits.data := slice(core.io.tc_a_bits_data, tcDataBits, p2)
+          adapter.io.inReq.bits.data := slice(core.io.tc_a_bits_data, tcCoreDataBits, p2)(tcSmemLineBits - 1, 0)
           adapter.io.inResp.ready := core.io.tc_d_ready(p2)
           client._1.a <> adapter.io.outReq
           adapter.io.outResp <> client._1.d
+          val lineData = adapter.io.inResp.bits.data
+          val fragmentData = if (outer.tcSmemLineSize == outer.tcSmemSize) {
+            lineData
+          } else {
+            val fragmentsPerLine = outer.tcSmemLineSize / outer.tcSmemSize
+            val fragmentIndex = RegInit(0.U(log2Ceil(fragmentsPerLine).W))
+            val requestFragmentIndex = ((rawAddress & (outer.tcSmemLineSize - 1).U) >>
+              log2Ceil(outer.tcSmemSize)).asUInt
+            val lineFragments = lineData.asTypeOf(Vec(fragmentsPerLine, UInt(tcDataBits.W)))
+            when(adapter.io.inReq.fire) {
+              fragmentIndex := requestFragmentIndex
+            }
+            lineFragments(fragmentIndex)
+          }
 
           tcAReady(p2) := adapter.io.inReq.ready
           tcDValid(p2) := adapter.io.inResp.valid
-          tcDData(p2) := adapter.io.inResp.bits.data
+          tcDData(p2) := padToCoreData(fragmentData)
           tcDTag(p2) := adapter.io.inResp.bits.source
         }
 
@@ -970,15 +999,15 @@ class RadianceTileModuleImp(outer: RadianceTile)
           gmemAdapter.io.inReq.bits.source := slice(core.io.tc_a_bits_tag, outer.tensorTagWidth, p0)
           gmemAdapter.io.inReq.bits.size := tcTlSize.U
           gmemAdapter.io.inReq.bits.opcode := Mux(core.io.tc_a_bits_write(p0).asBool, TLMessages.PutFullData, TLMessages.Get)
-          gmemAdapter.io.inReq.bits.mask := slice(core.io.tc_a_bits_mask, 32, p0)
+          gmemAdapter.io.inReq.bits.mask := slice(core.io.tc_a_bits_mask, 32, p0)(outer.tcSmemSize - 1, 0)
-          gmemAdapter.io.inReq.bits.data := slice(core.io.tc_a_bits_data, tcDataBits, p0)
+          gmemAdapter.io.inReq.bits.data := slice(core.io.tc_a_bits_data, tcCoreDataBits, p0)(tcDataBits - 1, 0)
           gmemAdapter.io.inResp.ready := core.io.tc_d_ready(p0)
           gmemClient._1.a <> gmemAdapter.io.outReq
           gmemAdapter.io.outResp <> gmemClient._1.d
 
           tcAReady(p0) := gmemAdapter.io.inReq.ready
           tcDValid(p0) := gmemAdapter.io.inResp.valid
-          tcDData(p0) := gmemAdapter.io.inResp.bits.data
+          tcDData(p0) := padToCoreData(gmemAdapter.io.inResp.bits.data)
           tcDTag(p0) := gmemAdapter.io.inResp.bits.source
         }