1/*************************************************************************************** 2* Copyright (c) 2020-2021 Institute of Computing Technology, Chinese Academy of Sciences 3* Copyright (c) 2020-2021 Peng Cheng Laboratory 4* 5* XiangShan is licensed under Mulan PSL v2. 6* You can use this software according to the terms and conditions of the Mulan PSL v2. 7* You may obtain a copy of Mulan PSL v2 at: 8* http://license.coscl.org.cn/MulanPSL2 9* 10* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, 11* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, 12* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE. 13* 14* See the Mulan PSL v2 for more details. 15***************************************************************************************/ 16 17package xiangshan.mem 18 19import org.chipsalliance.cde.config.Parameters 20import chisel3._ 21import chisel3.util._ 22import utils._ 23import utility._ 24import xiangshan._ 25import xiangshan.backend._ 26import xiangshan.backend.fu.fpu._ 27import xiangshan.backend.rob.RobLsqIO 28import xiangshan.cache._ 29import xiangshan.cache.mmu._ 30import xiangshan.frontend.FtqPtr 31import xiangshan.ExceptionNO._ 32import xiangshan.mem.mdp._ 33import xiangshan.backend.Bundles.{DynInst, MemExuOutput, MemMicroOpRbExt} 34import xiangshan.backend.rob.RobPtr 35 36class LqPtr(implicit p: Parameters) extends CircularQueuePtr[LqPtr]( 37 p => p(XSCoreParamsKey).VirtualLoadQueueSize 38){ 39} 40 41object LqPtr { 42 def apply(f: Bool, v: UInt)(implicit p: Parameters): LqPtr = { 43 val ptr = Wire(new LqPtr) 44 ptr.flag := f 45 ptr.value := v 46 ptr 47 } 48} 49 50trait HasLoadHelper { this: XSModule => 51 def rdataHelper(uop: DynInst, rdata: UInt): UInt = { 52 val fpWen = uop.fpWen 53 LookupTree(uop.fuOpType, List( 54 LSUOpType.lb -> SignExt(rdata(7, 0) , XLEN), 55 LSUOpType.lh -> SignExt(rdata(15, 0), XLEN), 56 /* 57 riscv-spec-20191213: 12.2 NaN Boxing of Narrower Values 58 Any operation that writes a narrower result to an f register must write 59 all 1s to the uppermost FLEN−n bits to yield a legal NaN-boxed value. 60 */ 61 LSUOpType.lw -> Mux(fpWen, FPU.box(rdata, FPU.S), SignExt(rdata(31, 0), XLEN)), 62 LSUOpType.ld -> Mux(fpWen, FPU.box(rdata, FPU.D), SignExt(rdata(63, 0), XLEN)), 63 LSUOpType.lbu -> ZeroExt(rdata(7, 0) , XLEN), 64 LSUOpType.lhu -> ZeroExt(rdata(15, 0), XLEN), 65 LSUOpType.lwu -> ZeroExt(rdata(31, 0), XLEN), 66 )) 67 } 68 69 def rdataVecHelper(alignedType: UInt, rdata: UInt): UInt = { 70 LookupTree(alignedType, List( 71 "b00".U -> ZeroExt(rdata(7, 0), VLEN), 72 "b01".U -> ZeroExt(rdata(15, 0), VLEN), 73 "b10".U -> ZeroExt(rdata(31, 0), VLEN), 74 "b11".U -> ZeroExt(rdata(63, 0), VLEN) 75 )) 76 } 77} 78 79class LqEnqIO(implicit p: Parameters) extends MemBlockBundle { 80 val canAccept = Output(Bool()) 81 val sqCanAccept = Input(Bool()) 82 val needAlloc = Vec(LSQEnqWidth, Input(Bool())) 83 val req = Vec(LSQEnqWidth, Flipped(ValidIO(new DynInst))) 84 val resp = Vec(LSQEnqWidth, Output(new LqPtr)) 85} 86 87class LqTriggerIO(implicit p: Parameters) extends XSBundle { 88 val hitLoadAddrTriggerHitVec = Input(Vec(TriggerNum, Bool())) 89 val lqLoadAddrTriggerHitVec = Output(Vec(TriggerNum, Bool())) 90} 91 92class LoadQueueTopDownIO(implicit p: Parameters) extends XSBundle { 93 val robHeadVaddr = Flipped(Valid(UInt(VAddrBits.W))) 94 val robHeadTlbReplay = Output(Bool()) 95 val robHeadTlbMiss = Output(Bool()) 96 val robHeadLoadVio = Output(Bool()) 97 val robHeadLoadMSHR = Output(Bool()) 98 val robHeadMissInDTlb = Input(Bool()) 99 val robHeadOtherReplay = Output(Bool()) 100} 101 102class LoadQueue(implicit p: Parameters) extends XSModule 103 with HasDCacheParameters 104 with HasCircularQueuePtrHelper 105 with HasLoadHelper 106 with HasPerfEvents 107{ 108 val io = IO(new Bundle() { 109 val redirect = Flipped(Valid(new Redirect)) 110 val vecFeedback = Vec(VecLoadPipelineWidth, Flipped(ValidIO(new FeedbackToLsqIO))) 111 val enq = new LqEnqIO 112 val ldu = new Bundle() { 113 val stld_nuke_query = Vec(LoadPipelineWidth, Flipped(new LoadNukeQueryIO)) // from load_s2 114 val ldld_nuke_query = Vec(LoadPipelineWidth, Flipped(new LoadNukeQueryIO)) // from load_s2 115 val ldin = Vec(LoadPipelineWidth, Flipped(Decoupled(new LqWriteBundle))) // from load_s3 116 } 117 val sta = new Bundle() { 118 val storeAddrIn = Vec(StorePipelineWidth, Flipped(Valid(new LsPipelineBundle))) // from store_s1 119 } 120 val std = new Bundle() { 121 val storeDataIn = Vec(StorePipelineWidth, Flipped(Valid(new MemExuOutput(isVector = true)))) // from store_s0, store data, send to sq from rs 122 } 123 val sq = new Bundle() { 124 val stAddrReadySqPtr = Input(new SqPtr) 125 val stAddrReadyVec = Input(Vec(StoreQueueSize, Bool())) 126 val stDataReadySqPtr = Input(new SqPtr) 127 val stDataReadyVec = Input(Vec(StoreQueueSize, Bool())) 128 val stIssuePtr = Input(new SqPtr) 129 val sqEmpty = Input(Bool()) 130 } 131 val ldout = Vec(LoadPipelineWidth, DecoupledIO(new MemExuOutput)) 132 val ld_raw_data = Vec(LoadPipelineWidth, Output(new LoadDataFromLQBundle)) 133 val replay = Vec(LoadPipelineWidth, Decoupled(new LsPipelineBundle)) 134 val refill = Flipped(ValidIO(new Refill)) 135 val tl_d_channel = Input(new DcacheToLduForwardIO) 136 val release = Flipped(Valid(new Release)) 137 val nuke_rollback = Output(Valid(new Redirect)) 138 val nack_rollback = Output(Valid(new Redirect)) 139 val rob = Flipped(new RobLsqIO) 140 val uncache = new UncacheWordIO 141 val exceptionAddr = new ExceptionAddrIO 142 val lqFull = Output(Bool()) 143 val lqDeq = Output(UInt(log2Up(CommitWidth + 1).W)) 144 val lqCancelCnt = Output(UInt(log2Up(VirtualLoadQueueSize+1).W)) 145 val lq_rep_full = Output(Bool()) 146 val tlbReplayDelayCycleCtrl = Vec(4, Input(UInt(ReSelectLen.W))) 147 val l2_hint = Input(Valid(new L2ToL1Hint())) 148 val tlb_hint = Flipped(new TlbHintIO) 149 val lqEmpty = Output(Bool()) 150 151 val lqDeqPtr = Output(new LqPtr) 152 153 val trigger = Vec(LoadPipelineWidth, new LqTriggerIO) 154 155 val debugTopDown = new LoadQueueTopDownIO 156 }) 157 158 val loadQueueRAR = Module(new LoadQueueRAR) // read-after-read violation 159 val loadQueueRAW = Module(new LoadQueueRAW) // read-after-write violation 160 val loadQueueReplay = Module(new LoadQueueReplay) // enqueue if need replay 161 val virtualLoadQueue = Module(new VirtualLoadQueue) // control state 162 val exceptionBuffer = Module(new LqExceptionBuffer) // exception buffer 163 val uncacheBuffer = Module(new UncacheBuffer) // uncache buffer 164 165 /** 166 * LoadQueueRAR 167 */ 168 loadQueueRAR.io.redirect <> io.redirect 169 loadQueueRAR.io.vecFeedback <> io.vecFeedback 170 loadQueueRAR.io.release <> io.release 171 loadQueueRAR.io.ldWbPtr <> virtualLoadQueue.io.ldWbPtr 172 for (w <- 0 until LoadPipelineWidth) { 173 loadQueueRAR.io.query(w).req <> io.ldu.ldld_nuke_query(w).req // from load_s1 174 loadQueueRAR.io.query(w).resp <> io.ldu.ldld_nuke_query(w).resp // to load_s2 175 loadQueueRAR.io.query(w).revoke := io.ldu.ldld_nuke_query(w).revoke // from load_s3 176 } 177 178 /** 179 * LoadQueueRAW 180 */ 181 loadQueueRAW.io.redirect <> io.redirect 182 loadQueueRAW.io.vecFeedback <> io.vecFeedback 183 loadQueueRAW.io.storeIn <> io.sta.storeAddrIn 184 loadQueueRAW.io.stAddrReadySqPtr <> io.sq.stAddrReadySqPtr 185 loadQueueRAW.io.stIssuePtr <> io.sq.stIssuePtr 186 for (w <- 0 until LoadPipelineWidth) { 187 loadQueueRAW.io.query(w).req <> io.ldu.stld_nuke_query(w).req // from load_s1 188 loadQueueRAW.io.query(w).resp <> io.ldu.stld_nuke_query(w).resp // to load_s2 189 loadQueueRAW.io.query(w).revoke := io.ldu.stld_nuke_query(w).revoke // from load_s3 190 } 191 192 /** 193 * VirtualLoadQueue 194 */ 195 virtualLoadQueue.io.redirect <> io.redirect 196 virtualLoadQueue.io.vecCommit <> io.vecFeedback 197 virtualLoadQueue.io.enq <> io.enq 198 virtualLoadQueue.io.ldin <> io.ldu.ldin // from load_s3 199 virtualLoadQueue.io.lqFull <> io.lqFull 200 virtualLoadQueue.io.lqDeq <> io.lqDeq 201 virtualLoadQueue.io.lqCancelCnt <> io.lqCancelCnt 202 virtualLoadQueue.io.lqEmpty <> io.lqEmpty 203 virtualLoadQueue.io.ldWbPtr <> io.lqDeqPtr 204 205 /** 206 * Load queue exception buffer 207 */ 208 exceptionBuffer.io.redirect <> io.redirect 209 for (i <- 0 until LoadPipelineWidth) { 210 exceptionBuffer.io.req(i).valid := io.ldu.ldin(i).valid && !io.ldu.ldin(i).bits.isvec // from load_s3 211 exceptionBuffer.io.req(i).bits := io.ldu.ldin(i).bits 212 } 213 // vlsu exception! 214 for (i <- 0 until VecLoadPipelineWidth) { 215 exceptionBuffer.io.req(LoadPipelineWidth + i).valid := io.vecFeedback(i).valid && io.vecFeedback(i).bits.feedback(VecFeedbacks.FLUSH) // have exception 216 exceptionBuffer.io.req(LoadPipelineWidth + i).bits := DontCare 217 exceptionBuffer.io.req(LoadPipelineWidth + i).bits.vaddr := io.vecFeedback(i).bits.vaddr 218 exceptionBuffer.io.req(LoadPipelineWidth + i).bits.uop.uopIdx := io.vecFeedback(i).bits.uopidx 219 exceptionBuffer.io.req(LoadPipelineWidth + i).bits.uop.robIdx := io.vecFeedback(i).bits.robidx 220 exceptionBuffer.io.req(LoadPipelineWidth + i).bits.uop.vpu.vstart := io.vecFeedback(i).bits.vstart 221 exceptionBuffer.io.req(LoadPipelineWidth + i).bits.uop.vpu.vl := io.vecFeedback(i).bits.vl 222 } 223 224 io.exceptionAddr <> exceptionBuffer.io.exceptionAddr 225 226 /** 227 * Load uncache buffer 228 */ 229 uncacheBuffer.io.redirect <> io.redirect 230 uncacheBuffer.io.ldout <> io.ldout 231 uncacheBuffer.io.ld_raw_data <> io.ld_raw_data 232 uncacheBuffer.io.rob <> io.rob 233 uncacheBuffer.io.uncache <> io.uncache 234 uncacheBuffer.io.trigger <> io.trigger 235 for ((buff, w) <- uncacheBuffer.io.req.zipWithIndex) { 236 buff.valid := io.ldu.ldin(w).valid // from load_s3 237 buff.bits := io.ldu.ldin(w).bits // from load_s3 238 } 239 240 241 io.nuke_rollback := loadQueueRAW.io.rollback 242 io.nack_rollback := uncacheBuffer.io.rollback 243 244 /* <------- DANGEROUS: Don't change sequence here ! -------> */ 245 246 /** 247 * LoadQueueReplay 248 */ 249 loadQueueReplay.io.redirect <> io.redirect 250 loadQueueReplay.io.enq <> io.ldu.ldin // from load_s3 251 loadQueueReplay.io.storeAddrIn <> io.sta.storeAddrIn // from store_s1 252 loadQueueReplay.io.storeDataIn <> io.std.storeDataIn // from store_s0 253 loadQueueReplay.io.replay <> io.replay 254 loadQueueReplay.io.refill <> io.refill 255 loadQueueReplay.io.tl_d_channel <> io.tl_d_channel 256 loadQueueReplay.io.stAddrReadySqPtr <> io.sq.stAddrReadySqPtr 257 loadQueueReplay.io.stAddrReadyVec <> io.sq.stAddrReadyVec 258 loadQueueReplay.io.stDataReadySqPtr <> io.sq.stDataReadySqPtr 259 loadQueueReplay.io.stDataReadyVec <> io.sq.stDataReadyVec 260 loadQueueReplay.io.sqEmpty <> io.sq.sqEmpty 261 loadQueueReplay.io.lqFull <> io.lq_rep_full 262 loadQueueReplay.io.ldWbPtr <> virtualLoadQueue.io.ldWbPtr 263 loadQueueReplay.io.rarFull <> loadQueueRAR.io.lqFull 264 loadQueueReplay.io.rawFull <> loadQueueRAW.io.lqFull 265 loadQueueReplay.io.l2_hint <> io.l2_hint 266 loadQueueReplay.io.tlb_hint <> io.tlb_hint 267 loadQueueReplay.io.tlbReplayDelayCycleCtrl <> io.tlbReplayDelayCycleCtrl 268 // TODO: implement it! 269 loadQueueReplay.io.vecFeedback := io.vecFeedback 270 271 loadQueueReplay.io.debugTopDown <> io.debugTopDown 272 273 val full_mask = Cat(loadQueueRAR.io.lqFull, loadQueueRAW.io.lqFull, loadQueueReplay.io.lqFull) 274 XSPerfAccumulate("full_mask_000", full_mask === 0.U) 275 XSPerfAccumulate("full_mask_001", full_mask === 1.U) 276 XSPerfAccumulate("full_mask_010", full_mask === 2.U) 277 XSPerfAccumulate("full_mask_011", full_mask === 3.U) 278 XSPerfAccumulate("full_mask_100", full_mask === 4.U) 279 XSPerfAccumulate("full_mask_101", full_mask === 5.U) 280 XSPerfAccumulate("full_mask_110", full_mask === 6.U) 281 XSPerfAccumulate("full_mask_111", full_mask === 7.U) 282 XSPerfAccumulate("nuke_rollback", io.nuke_rollback.valid) 283 XSPerfAccumulate("nack_rollabck", io.nack_rollback.valid) 284 285 // perf cnt 286 val perfEvents = Seq(virtualLoadQueue, loadQueueRAR, loadQueueRAW, loadQueueReplay).flatMap(_.getPerfEvents) ++ 287 Seq( 288 ("full_mask_000", full_mask === 0.U), 289 ("full_mask_001", full_mask === 1.U), 290 ("full_mask_010", full_mask === 2.U), 291 ("full_mask_011", full_mask === 3.U), 292 ("full_mask_100", full_mask === 4.U), 293 ("full_mask_101", full_mask === 5.U), 294 ("full_mask_110", full_mask === 6.U), 295 ("full_mask_111", full_mask === 7.U), 296 ("nuke_rollback", io.nuke_rollback.valid), 297 ("nack_rollback", io.nack_rollback.valid) 298 ) 299 generatePerfEvent() 300 // end 301}