1package xiangshan.mem 2 3import chisel3._ 4import chisel3.util._ 5import utils._ 6import xiangshan._ 7import xiangshan.cache._ 8import xiangshan.cache.{DCacheWordIO, DCacheLineIO, TlbRequestIO, MemoryOpConstants} 9import xiangshan.backend.LSUOpType 10import xiangshan.mem._ 11import xiangshan.backend.roq.RoqPtr 12import xiangshan.backend.fu.fpu.boxF32ToF64 13 14 15class LqPtr extends CircularQueuePtr(LqPtr.LoadQueueSize) { } 16 17object LqPtr extends HasXSParameter { 18 def apply(f: Bool, v: UInt): LqPtr = { 19 val ptr = Wire(new LqPtr) 20 ptr.flag := f 21 ptr.value := v 22 ptr 23 } 24} 25 26 27// Load Queue 28class LoadQueue extends XSModule with HasDCacheParameters with HasCircularQueuePtrHelper { 29 val io = IO(new Bundle() { 30 val enq = new Bundle() { 31 val canAccept = Output(Bool()) 32 val req = Vec(RenameWidth, Flipped(ValidIO(new MicroOp))) 33 val resp = Vec(RenameWidth, Output(new LqPtr)) 34 } 35 val brqRedirect = Input(Valid(new Redirect)) 36 val loadIn = Vec(LoadPipelineWidth, Flipped(Valid(new LsPipelineBundle))) 37 val storeIn = Vec(StorePipelineWidth, Flipped(Valid(new LsPipelineBundle))) // FIXME: Valid() only 38 val ldout = Vec(2, DecoupledIO(new ExuOutput)) // writeback load 39 val forward = Vec(LoadPipelineWidth, Flipped(new LoadForwardQueryIO)) 40 val commits = Flipped(Vec(CommitWidth, Valid(new RoqCommit))) 41 val rollback = Output(Valid(new Redirect)) // replay now starts from load instead of store 42 val dcache = new DCacheLineIO 43 val uncache = new DCacheWordIO 44 val roqDeqPtr = Input(new RoqPtr) 45 val exceptionAddr = new ExceptionAddrIO 46 // val refill = Flipped(Valid(new DCacheLineReq )) 47 }) 48 49 val uop = Reg(Vec(LoadQueueSize, new MicroOp)) 50 // val data = Reg(Vec(LoadQueueSize, new LsRoqEntry)) 51 val dataModule = Module(new LSQueueData(LoadQueueSize, LoadPipelineWidth)) 52 dataModule.io := DontCare 53 val allocated = RegInit(VecInit(List.fill(LoadQueueSize)(false.B))) // lq entry has been allocated 54 val valid = RegInit(VecInit(List.fill(LoadQueueSize)(false.B))) // data is valid 55 val writebacked = RegInit(VecInit(List.fill(LoadQueueSize)(false.B))) // inst has been writebacked to CDB 56 val commited = Reg(Vec(LoadQueueSize, Bool())) // inst has been writebacked to CDB 57 val miss = Reg(Vec(LoadQueueSize, Bool())) // load inst missed, waiting for miss queue to accept miss request 58 val listening = Reg(Vec(LoadQueueSize, Bool())) // waiting for refill result 59 val pending = Reg(Vec(LoadQueueSize, Bool())) // mmio pending: inst is an mmio inst, it will not be executed until it reachs the end of roq 60 61 val enqPtrExt = RegInit(0.U.asTypeOf(new LqPtr)) 62 val deqPtrExt = RegInit(0.U.asTypeOf(new LqPtr)) 63 val enqPtr = enqPtrExt.value 64 val deqPtr = deqPtrExt.value 65 val sameFlag = enqPtrExt.flag === deqPtrExt.flag 66 val isEmpty = enqPtr === deqPtr && sameFlag 67 val isFull = enqPtr === deqPtr && !sameFlag 68 val allowIn = !isFull 69 70 val loadCommit = (0 until CommitWidth).map(i => io.commits(i).valid && !io.commits(i).bits.isWalk && io.commits(i).bits.uop.ctrl.commitType === CommitType.LOAD) 71 val mcommitIdx = (0 until CommitWidth).map(i => io.commits(i).bits.uop.lqIdx.value) 72 73 val tailMask = (((1.U((LoadQueueSize + 1).W)) << deqPtr).asUInt - 1.U)(LoadQueueSize - 1, 0) 74 val headMask = (((1.U((LoadQueueSize + 1).W)) << enqPtr).asUInt - 1.U)(LoadQueueSize - 1, 0) 75 val enqDeqMask1 = tailMask ^ headMask 76 val enqDeqMask = Mux(sameFlag, enqDeqMask1, ~enqDeqMask1) 77 78 // Enqueue at dispatch 79 val validEntries = distanceBetween(enqPtrExt, deqPtrExt) 80 val firedDispatch = io.enq.req.map(_.valid) 81 io.enq.canAccept := validEntries <= (LoadQueueSize - RenameWidth).U 82 XSDebug(p"(ready, valid): ${io.enq.canAccept}, ${Binary(Cat(firedDispatch))}\n") 83 for (i <- 0 until RenameWidth) { 84 val offset = if (i == 0) 0.U else PopCount((0 until i).map(firedDispatch(_))) 85 val lqIdx = enqPtrExt + offset 86 val index = lqIdx.value 87 when(io.enq.req(i).valid) { 88 uop(index) := io.enq.req(i).bits 89 allocated(index) := true.B 90 valid(index) := false.B 91 writebacked(index) := false.B 92 commited(index) := false.B 93 miss(index) := false.B 94 listening(index) := false.B 95 pending(index) := false.B 96 } 97 io.enq.resp(i) := lqIdx 98 99 XSError(!io.enq.canAccept && io.enq.req(i).valid, "should not valid when not ready\n") 100 } 101 102 when(Cat(firedDispatch).orR) { 103 enqPtrExt := enqPtrExt + PopCount(firedDispatch) 104 XSInfo("dispatched %d insts to lq\n", PopCount(firedDispatch)) 105 } 106 107 // writeback load 108 (0 until LoadPipelineWidth).map(i => { 109 dataModule.io.wb(i).wen := false.B 110 when(io.loadIn(i).fire()) { 111 when(io.loadIn(i).bits.miss) { 112 XSInfo(io.loadIn(i).valid, "load miss write to lq idx %d pc 0x%x vaddr %x paddr %x data %x mask %x forwardData %x forwardMask: %x mmio %x roll %x exc %x\n", 113 io.loadIn(i).bits.uop.lqIdx.asUInt, 114 io.loadIn(i).bits.uop.cf.pc, 115 io.loadIn(i).bits.vaddr, 116 io.loadIn(i).bits.paddr, 117 io.loadIn(i).bits.data, 118 io.loadIn(i).bits.mask, 119 io.loadIn(i).bits.forwardData.asUInt, 120 io.loadIn(i).bits.forwardMask.asUInt, 121 io.loadIn(i).bits.mmio, 122 io.loadIn(i).bits.rollback, 123 io.loadIn(i).bits.uop.cf.exceptionVec.asUInt 124 ) 125 }.otherwise { 126 XSInfo(io.loadIn(i).valid, "load hit write to cbd lqidx %d pc 0x%x vaddr %x paddr %x data %x mask %x forwardData %x forwardMask: %x mmio %x roll %x exc %x\n", 127 io.loadIn(i).bits.uop.lqIdx.asUInt, 128 io.loadIn(i).bits.uop.cf.pc, 129 io.loadIn(i).bits.vaddr, 130 io.loadIn(i).bits.paddr, 131 io.loadIn(i).bits.data, 132 io.loadIn(i).bits.mask, 133 io.loadIn(i).bits.forwardData.asUInt, 134 io.loadIn(i).bits.forwardMask.asUInt, 135 io.loadIn(i).bits.mmio, 136 io.loadIn(i).bits.rollback, 137 io.loadIn(i).bits.uop.cf.exceptionVec.asUInt 138 ) 139 } 140 val loadWbIndex = io.loadIn(i).bits.uop.lqIdx.value 141 valid(loadWbIndex) := !io.loadIn(i).bits.miss && !io.loadIn(i).bits.mmio 142 writebacked(loadWbIndex) := !io.loadIn(i).bits.miss && !io.loadIn(i).bits.mmio 143 allocated(loadWbIndex) := !io.loadIn(i).bits.uop.cf.exceptionVec.asUInt.orR 144 145 val loadWbData = Wire(new LsqEntry) 146 loadWbData.paddr := io.loadIn(i).bits.paddr 147 loadWbData.vaddr := io.loadIn(i).bits.vaddr 148 loadWbData.mask := io.loadIn(i).bits.mask 149 loadWbData.data := io.loadIn(i).bits.data // for mmio / misc / debug 150 loadWbData.mmio := io.loadIn(i).bits.mmio 151 loadWbData.fwdMask := io.loadIn(i).bits.forwardMask 152 loadWbData.fwdData := io.loadIn(i).bits.forwardData 153 loadWbData.exception := io.loadIn(i).bits.uop.cf.exceptionVec.asUInt 154 dataModule.io.wbWrite(i, loadWbIndex, loadWbData) 155 dataModule.io.wb(i).wen := true.B 156 157 val dcacheMissed = io.loadIn(i).bits.miss && !io.loadIn(i).bits.mmio 158 miss(loadWbIndex) := dcacheMissed 159 listening(loadWbIndex) := dcacheMissed 160 pending(loadWbIndex) := io.loadIn(i).bits.mmio 161 } 162 }) 163 164 // cache miss request 165 val inflightReqs = RegInit(VecInit(Seq.fill(cfg.nLoadMissEntries)(0.U.asTypeOf(new InflightBlockInfo)))) 166 val inflightReqFull = inflightReqs.map(req => req.valid).reduce(_&&_) 167 val reqBlockIndex = PriorityEncoder(~VecInit(inflightReqs.map(req => req.valid)).asUInt) 168 169 val missRefillSelVec = VecInit( 170 (0 until LoadQueueSize).map{ i => 171 val inflight = inflightReqs.map(req => req.valid && req.block_addr === get_block_addr(dataModule.io.rdata(i).paddr)).reduce(_||_) 172 allocated(i) && miss(i) && !inflight 173 }) 174 175 val missRefillSel = getFirstOne(missRefillSelVec, tailMask) 176 val missRefillBlockAddr = get_block_addr(dataModule.io.rdata(missRefillSel).paddr) 177 io.dcache.req.valid := missRefillSelVec.asUInt.orR 178 io.dcache.req.bits.cmd := MemoryOpConstants.M_XRD 179 io.dcache.req.bits.addr := missRefillBlockAddr 180 io.dcache.req.bits.data := DontCare 181 io.dcache.req.bits.mask := DontCare 182 183 io.dcache.req.bits.meta.id := DontCare 184 io.dcache.req.bits.meta.vaddr := DontCare // dataModule.io.rdata(missRefillSel).vaddr 185 io.dcache.req.bits.meta.paddr := missRefillBlockAddr 186 io.dcache.req.bits.meta.uop := uop(missRefillSel) 187 io.dcache.req.bits.meta.mmio := false.B // dataModule.io.rdata(missRefillSel).mmio 188 io.dcache.req.bits.meta.tlb_miss := false.B 189 io.dcache.req.bits.meta.mask := DontCare 190 io.dcache.req.bits.meta.replay := false.B 191 192 io.dcache.resp.ready := true.B 193 194 assert(!(dataModule.io.rdata(missRefillSel).mmio && io.dcache.req.valid)) 195 196 when(io.dcache.req.fire()) { 197 miss(missRefillSel) := false.B 198 listening(missRefillSel) := true.B 199 200 // mark this block as inflight 201 inflightReqs(reqBlockIndex).valid := true.B 202 inflightReqs(reqBlockIndex).block_addr := missRefillBlockAddr 203 assert(!inflightReqs(reqBlockIndex).valid) 204 } 205 206 when(io.dcache.resp.fire()) { 207 val inflight = inflightReqs.map(req => req.valid && req.block_addr === get_block_addr(io.dcache.resp.bits.meta.paddr)).reduce(_||_) 208 assert(inflight) 209 for (i <- 0 until cfg.nLoadMissEntries) { 210 when (inflightReqs(i).valid && inflightReqs(i).block_addr === get_block_addr(io.dcache.resp.bits.meta.paddr)) { 211 inflightReqs(i).valid := false.B 212 } 213 } 214 } 215 216 217 when(io.dcache.req.fire()){ 218 XSDebug("miss req: pc:0x%x roqIdx:%d lqIdx:%d (p)addr:0x%x vaddr:0x%x\n", 219 io.dcache.req.bits.meta.uop.cf.pc, io.dcache.req.bits.meta.uop.roqIdx.asUInt, io.dcache.req.bits.meta.uop.lqIdx.asUInt, 220 io.dcache.req.bits.addr, io.dcache.req.bits.meta.vaddr 221 ) 222 } 223 224 when(io.dcache.resp.fire()){ 225 XSDebug("miss resp: pc:0x%x roqIdx:%d lqIdx:%d (p)addr:0x%x data %x\n", 226 io.dcache.resp.bits.meta.uop.cf.pc, io.dcache.resp.bits.meta.uop.roqIdx.asUInt, io.dcache.resp.bits.meta.uop.lqIdx.asUInt, 227 io.dcache.resp.bits.meta.paddr, io.dcache.resp.bits.data 228 ) 229 } 230 231 // Refill 64 bit in a cycle 232 // Refill data comes back from io.dcache.resp 233 dataModule.io.refill.dcache := io.dcache.resp.bits 234 235 (0 until LoadQueueSize).map(i => { 236 val blockMatch = get_block_addr(dataModule.io.rdata(i).paddr) === io.dcache.resp.bits.meta.paddr 237 dataModule.io.refill.wen(i) := false.B 238 when(allocated(i) && listening(i) && blockMatch && io.dcache.resp.fire()) { 239 dataModule.io.refill.wen(i) := true.B 240 valid(i) := true.B 241 listening(i) := false.B 242 } 243 }) 244 245 // writeback up to 2 missed load insts to CDB 246 // just randomly pick 2 missed load (data refilled), write them back to cdb 247 val loadWbSelVec = VecInit((0 until LoadQueueSize).map(i => { 248 allocated(i) && valid(i) && !writebacked(i) 249 })).asUInt() // use uint instead vec to reduce verilog lines 250 val loadWbSel = Wire(Vec(StorePipelineWidth, UInt(log2Up(LoadQueueSize).W))) 251 val loadWbSelV= Wire(Vec(StorePipelineWidth, Bool())) 252 val lselvec0 = PriorityEncoderOH(loadWbSelVec) 253 val lselvec1 = PriorityEncoderOH(loadWbSelVec & (~lselvec0).asUInt) 254 loadWbSel(0) := OHToUInt(lselvec0) 255 loadWbSelV(0):= lselvec0.orR 256 loadWbSel(1) := OHToUInt(lselvec1) 257 loadWbSelV(1) := lselvec1.orR 258 (0 until StorePipelineWidth).map(i => { 259 // data select 260 val rdata = dataModule.io.rdata(loadWbSel(i)).data 261 val func = uop(loadWbSel(i)).ctrl.fuOpType 262 val raddr = dataModule.io.rdata(loadWbSel(i)).paddr 263 val rdataSel = LookupTree(raddr(2, 0), List( 264 "b000".U -> rdata(63, 0), 265 "b001".U -> rdata(63, 8), 266 "b010".U -> rdata(63, 16), 267 "b011".U -> rdata(63, 24), 268 "b100".U -> rdata(63, 32), 269 "b101".U -> rdata(63, 40), 270 "b110".U -> rdata(63, 48), 271 "b111".U -> rdata(63, 56) 272 )) 273 val rdataPartialLoad = LookupTree(func, List( 274 LSUOpType.lb -> SignExt(rdataSel(7, 0) , XLEN), 275 LSUOpType.lh -> SignExt(rdataSel(15, 0), XLEN), 276 LSUOpType.lw -> SignExt(rdataSel(31, 0), XLEN), 277 LSUOpType.ld -> SignExt(rdataSel(63, 0), XLEN), 278 LSUOpType.lbu -> ZeroExt(rdataSel(7, 0) , XLEN), 279 LSUOpType.lhu -> ZeroExt(rdataSel(15, 0), XLEN), 280 LSUOpType.lwu -> ZeroExt(rdataSel(31, 0), XLEN), 281 LSUOpType.flw -> boxF32ToF64(rdataSel(31, 0)) 282 )) 283 io.ldout(i).bits.uop := uop(loadWbSel(i)) 284 io.ldout(i).bits.uop.cf.exceptionVec := dataModule.io.rdata(loadWbSel(i)).exception.asBools 285 io.ldout(i).bits.uop.lqIdx := loadWbSel(i).asTypeOf(new LqPtr) 286 io.ldout(i).bits.data := rdataPartialLoad 287 io.ldout(i).bits.redirectValid := false.B 288 io.ldout(i).bits.redirect := DontCare 289 io.ldout(i).bits.brUpdate := DontCare 290 io.ldout(i).bits.debug.isMMIO := dataModule.io.rdata(loadWbSel(i)).mmio 291 io.ldout(i).bits.fflags := DontCare 292 io.ldout(i).valid := loadWbSelVec(loadWbSel(i)) && loadWbSelV(i) 293 when(io.ldout(i).fire()) { 294 writebacked(loadWbSel(i)) := true.B 295 XSInfo("load miss write to cbd roqidx %d lqidx %d pc 0x%x paddr %x data %x mmio %x\n", 296 io.ldout(i).bits.uop.roqIdx.asUInt, 297 io.ldout(i).bits.uop.lqIdx.asUInt, 298 io.ldout(i).bits.uop.cf.pc, 299 dataModule.io.rdata(loadWbSel(i)).paddr, 300 dataModule.io.rdata(loadWbSel(i)).data, 301 dataModule.io.rdata(loadWbSel(i)).mmio 302 ) 303 } 304 }) 305 306 // move tailPtr 307 // allocatedMask: dequeuePtr can go to the next 1-bit 308 val allocatedMask = VecInit((0 until LoadQueueSize).map(i => allocated(i) || !enqDeqMask(i))) 309 // find the first one from deqPtr (deqPtr) 310 val nextTail1 = getFirstOneWithFlag(allocatedMask, tailMask, deqPtrExt.flag) 311 val nextTail = Mux(Cat(allocatedMask).orR, nextTail1, enqPtrExt) 312 deqPtrExt := nextTail 313 314 // When load commited, mark it as !allocated, this entry will be recycled later 315 (0 until CommitWidth).map(i => { 316 when(loadCommit(i)) { 317 allocated(mcommitIdx(i)) := false.B 318 XSDebug("load commit %d: idx %d %x\n", i.U, mcommitIdx(i), uop(mcommitIdx(i)).cf.pc) 319 } 320 }) 321 322 // rollback check 323 val rollback = Wire(Vec(StorePipelineWidth, Valid(new Redirect))) 324 325 def getFirstOne(mask: Vec[Bool], startMask: UInt) = { 326 val length = mask.length 327 val highBits = (0 until length).map(i => mask(i) & ~startMask(i)) 328 val highBitsUint = Cat(highBits.reverse) 329 PriorityEncoder(Mux(highBitsUint.orR(), highBitsUint, mask.asUInt)) 330 } 331 332 def getFirstOneWithFlag(mask: Vec[Bool], startMask: UInt, startFlag: Bool) = { 333 val length = mask.length 334 val highBits = (0 until length).map(i => mask(i) & ~startMask(i)) 335 val highBitsUint = Cat(highBits.reverse) 336 val changeDirection = !highBitsUint.orR() 337 val index = PriorityEncoder(Mux(!changeDirection, highBitsUint, mask.asUInt)) 338 LqPtr(startFlag ^ changeDirection, index) 339 } 340 341 def getOldestInTwo(valid: Seq[Bool], uop: Seq[MicroOp]) = { 342 assert(valid.length == uop.length) 343 assert(valid.length == 2) 344 Mux(valid(0) && valid(1), 345 Mux(isAfter(uop(0).roqIdx, uop(1).roqIdx), uop(1), uop(0)), 346 Mux(valid(0) && !valid(1), uop(0), uop(1))) 347 } 348 349 def getAfterMask(valid: Seq[Bool], uop: Seq[MicroOp]) = { 350 assert(valid.length == uop.length) 351 val length = valid.length 352 (0 until length).map(i => { 353 (0 until length).map(j => { 354 Mux(valid(i) && valid(j), 355 isAfter(uop(i).roqIdx, uop(j).roqIdx), 356 Mux(!valid(i), true.B, false.B)) 357 }) 358 }) 359 } 360 361 def rangeMask(start: LqPtr, end: LqPtr): UInt = { 362 val startMask = (1.U((LoadQueueSize + 1).W) << start.value).asUInt - 1.U 363 val endMask = (1.U((LoadQueueSize + 1).W) << end.value).asUInt - 1.U 364 val xorMask = startMask(LoadQueueSize - 1, 0) ^ endMask(LoadQueueSize - 1, 0) 365 Mux(start.flag === end.flag, xorMask, ~xorMask) 366 } 367 368 // ignore data forward 369 (0 until LoadPipelineWidth).foreach(i => { 370 io.forward(i).forwardMask := DontCare 371 io.forward(i).forwardData := DontCare 372 }) 373 374 // store backward query and rollback 375 // val needCheck = Seq.fill(8)(WireInit(true.B)) 376 (0 until StorePipelineWidth).foreach(i => { 377 rollback(i) := DontCare 378 379 when(io.storeIn(i).valid) { 380 val startIndex = io.storeIn(i).bits.uop.lqIdx.value 381 val lqIdxMask = ((1.U((LoadQueueSize + 1).W) << startIndex).asUInt - 1.U)(LoadQueueSize - 1, 0) 382 val xorMask = lqIdxMask ^ headMask 383 val sameFlag = io.storeIn(i).bits.uop.lqIdx.flag === enqPtrExt.flag 384 val toEnqPtrMask = Mux(sameFlag, xorMask, ~xorMask) 385 386 // check if load already in lq needs to be rolledback 387 val lqViolationVec = VecInit((0 until LoadQueueSize).map(j => { 388 val addrMatch = allocated(j) && 389 io.storeIn(i).bits.paddr(PAddrBits - 1, 3) === dataModule.io.rdata(j).paddr(PAddrBits - 1, 3) 390 val entryNeedCheck = toEnqPtrMask(j) && addrMatch && (valid(j) || listening(j) || miss(j)) 391 // TODO: update refilled data 392 val violationVec = (0 until 8).map(k => dataModule.io.rdata(j).mask(k) && io.storeIn(i).bits.mask(k)) 393 Cat(violationVec).orR() && entryNeedCheck 394 })) 395 val lqViolation = lqViolationVec.asUInt().orR() 396 val lqViolationIndex = getFirstOne(lqViolationVec, lqIdxMask) 397 val lqViolationUop = uop(lqViolationIndex) 398 XSDebug(lqViolation, p"${Binary(Cat(lqViolationVec))}, $startIndex, $lqViolationIndex\n") 399 400 // when l/s writeback to roq together, check if rollback is needed 401 val wbViolationVec = VecInit((0 until LoadPipelineWidth).map(j => { 402 io.loadIn(j).valid && 403 isAfter(io.loadIn(j).bits.uop.roqIdx, io.storeIn(i).bits.uop.roqIdx) && 404 io.storeIn(i).bits.paddr(PAddrBits - 1, 3) === io.loadIn(j).bits.paddr(PAddrBits - 1, 3) && 405 (io.storeIn(i).bits.mask & io.loadIn(j).bits.mask).orR 406 })) 407 val wbViolation = wbViolationVec.asUInt().orR() 408 val wbViolationUop = getOldestInTwo(wbViolationVec, io.loadIn.map(_.bits.uop)) 409 XSDebug(wbViolation, p"${Binary(Cat(wbViolationVec))}, $wbViolationUop\n") 410 411 // check if rollback is needed for load in l1 412 val l1ViolationVec = VecInit((0 until LoadPipelineWidth).map(j => { 413 io.forward(j).valid && // L4 valid\ 414 isAfter(io.forward(j).uop.roqIdx, io.storeIn(i).bits.uop.roqIdx) && 415 io.storeIn(i).bits.paddr(PAddrBits - 1, 3) === io.forward(j).paddr(PAddrBits - 1, 3) && 416 (io.storeIn(i).bits.mask & io.forward(j).mask).orR 417 })) 418 val l1Violation = l1ViolationVec.asUInt().orR() 419 val l1ViolationUop = getOldestInTwo(l1ViolationVec, io.forward.map(_.uop)) 420 XSDebug(l1Violation, p"${Binary(Cat(l1ViolationVec))}, $l1ViolationUop\n") 421 422 val rollbackValidVec = Seq(lqViolation, wbViolation, l1Violation) 423 val rollbackUopVec = Seq(lqViolationUop, wbViolationUop, l1ViolationUop) 424 rollback(i).valid := Cat(rollbackValidVec).orR 425 val mask = getAfterMask(rollbackValidVec, rollbackUopVec) 426 val oneAfterZero = mask(1)(0) 427 val rollbackUop = Mux(oneAfterZero && mask(2)(0), 428 rollbackUopVec(0), 429 Mux(!oneAfterZero && mask(2)(1), rollbackUopVec(1), rollbackUopVec(2))) 430 rollback(i).bits.roqIdx := rollbackUop.roqIdx - 1.U 431 432 rollback(i).bits.isReplay := true.B 433 rollback(i).bits.isMisPred := false.B 434 rollback(i).bits.isException := false.B 435 rollback(i).bits.isFlushPipe := false.B 436 437 XSDebug( 438 l1Violation, 439 "need rollback (l4 load) pc %x roqidx %d target %x\n", 440 io.storeIn(i).bits.uop.cf.pc, io.storeIn(i).bits.uop.roqIdx.asUInt, l1ViolationUop.roqIdx.asUInt 441 ) 442 XSDebug( 443 lqViolation, 444 "need rollback (ld wb before store) pc %x roqidx %d target %x\n", 445 io.storeIn(i).bits.uop.cf.pc, io.storeIn(i).bits.uop.roqIdx.asUInt, lqViolationUop.roqIdx.asUInt 446 ) 447 XSDebug( 448 wbViolation, 449 "need rollback (ld/st wb together) pc %x roqidx %d target %x\n", 450 io.storeIn(i).bits.uop.cf.pc, io.storeIn(i).bits.uop.roqIdx.asUInt, wbViolationUop.roqIdx.asUInt 451 ) 452 }.otherwise { 453 rollback(i).valid := false.B 454 } 455 }) 456 457 def rollbackSel(a: Valid[Redirect], b: Valid[Redirect]): ValidIO[Redirect] = { 458 Mux( 459 a.valid, 460 Mux( 461 b.valid, 462 Mux(isAfter(a.bits.roqIdx, b.bits.roqIdx), b, a), // a,b both valid, sel oldest 463 a // sel a 464 ), 465 b // sel b 466 ) 467 } 468 469 io.rollback := ParallelOperation(rollback, rollbackSel) 470 471 // Memory mapped IO / other uncached operations 472 473 // setup misc mem access req 474 // mask / paddr / data can be get from lq.data 475 val commitType = io.commits(0).bits.uop.ctrl.commitType 476 io.uncache.req.valid := pending(deqPtr) && allocated(deqPtr) && 477 commitType === CommitType.LOAD && 478 io.roqDeqPtr === uop(deqPtr).roqIdx && 479 !io.commits(0).bits.isWalk 480 481 io.uncache.req.bits.cmd := MemoryOpConstants.M_XRD 482 io.uncache.req.bits.addr := dataModule.io.rdata(deqPtr).paddr 483 io.uncache.req.bits.data := dataModule.io.rdata(deqPtr).data 484 io.uncache.req.bits.mask := dataModule.io.rdata(deqPtr).mask 485 486 io.uncache.req.bits.meta.id := DontCare // TODO: // FIXME 487 io.uncache.req.bits.meta.vaddr := DontCare 488 io.uncache.req.bits.meta.paddr := dataModule.io.rdata(deqPtr).paddr 489 io.uncache.req.bits.meta.uop := uop(deqPtr) 490 io.uncache.req.bits.meta.mmio := true.B // dataModule.io.rdata(deqPtr).mmio 491 io.uncache.req.bits.meta.tlb_miss := false.B 492 io.uncache.req.bits.meta.mask := dataModule.io.rdata(deqPtr).mask 493 io.uncache.req.bits.meta.replay := false.B 494 495 io.uncache.resp.ready := true.B 496 497 when(io.uncache.req.fire()){ 498 pending(deqPtr) := false.B 499 } 500 501 dataModule.io.uncache.wen := false.B 502 when(io.uncache.resp.fire()){ 503 valid(deqPtr) := true.B 504 dataModule.io.uncacheWrite(deqPtr, io.uncache.resp.bits.data(XLEN-1, 0)) 505 dataModule.io.uncache.wen := true.B 506 // TODO: write back exception info 507 } 508 509 when(io.uncache.req.fire()){ 510 XSDebug("uncache req: pc %x addr %x data %x op %x mask %x\n", 511 uop(deqPtr).cf.pc, 512 io.uncache.req.bits.addr, 513 io.uncache.req.bits.data, 514 io.uncache.req.bits.cmd, 515 io.uncache.req.bits.mask 516 ) 517 } 518 519 when(io.uncache.resp.fire()){ 520 XSDebug("uncache resp: data %x\n", io.dcache.resp.bits.data) 521 } 522 523 // Read vaddr for mem exception 524 io.exceptionAddr.vaddr := dataModule.io.rdata(io.exceptionAddr.lsIdx.lqIdx.value).vaddr 525 526 // misprediction recovery / exception redirect 527 // invalidate lq term using robIdx 528 val needCancel = Wire(Vec(LoadQueueSize, Bool())) 529 for (i <- 0 until LoadQueueSize) { 530 needCancel(i) := uop(i).roqIdx.needFlush(io.brqRedirect) && allocated(i) && !commited(i) 531 when(needCancel(i)) { 532 when(io.brqRedirect.bits.isReplay){ 533 valid(i) := false.B 534 writebacked(i) := false.B 535 listening(i) := false.B 536 miss(i) := false.B 537 pending(i) := false.B 538 }.otherwise{ 539 allocated(i) := false.B 540 } 541 } 542 } 543 when (io.brqRedirect.valid && io.brqRedirect.bits.isMisPred) { 544 enqPtrExt := enqPtrExt - PopCount(needCancel) 545 } 546 547 // assert(!io.rollback.valid) 548 when(io.rollback.valid) { 549 XSDebug("Mem rollback: pc %x roqidx %d\n", io.rollback.bits.pc, io.rollback.bits.roqIdx.asUInt) 550 } 551 552 // debug info 553 XSDebug("head %d:%d tail %d:%d\n", enqPtrExt.flag, enqPtr, deqPtrExt.flag, deqPtr) 554 555 def PrintFlag(flag: Bool, name: String): Unit = { 556 when(flag) { 557 XSDebug(false, true.B, name) 558 }.otherwise { 559 XSDebug(false, true.B, " ") 560 } 561 } 562 563 for (i <- 0 until LoadQueueSize) { 564 if (i % 4 == 0) XSDebug("") 565 XSDebug(false, true.B, "%x [%x] ", uop(i).cf.pc, dataModule.io.rdata(i).paddr) 566 PrintFlag(allocated(i), "a") 567 PrintFlag(allocated(i) && valid(i), "v") 568 PrintFlag(allocated(i) && writebacked(i), "w") 569 PrintFlag(allocated(i) && commited(i), "c") 570 PrintFlag(allocated(i) && miss(i), "m") 571 PrintFlag(allocated(i) && listening(i), "l") 572 PrintFlag(allocated(i) && pending(i), "p") 573 XSDebug(false, true.B, " ") 574 if (i % 4 == 3 || i == LoadQueueSize - 1) XSDebug(false, true.B, "\n") 575 } 576 577} 578