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 chipsalliance.rocketchip.config.Parameters 20import chisel3._ 21import chisel3.util._ 22import utils._ 23import xiangshan._ 24import xiangshan.cache._ 25import xiangshan.cache.{DCacheWordIO, DCacheLineIO, MemoryOpConstants} 26import xiangshan.cache.mmu.{TlbRequestIO} 27import xiangshan.mem._ 28import xiangshan.backend.rob.RobLsqIO 29 30class ExceptionAddrIO(implicit p: Parameters) extends XSBundle { 31 val lsIdx = Input(new LSIdx) 32 val isStore = Input(Bool()) 33 val vaddr = Output(UInt(VAddrBits.W)) 34} 35 36class FwdEntry extends Bundle { 37 val validFast = Bool() // validFast is generated the same cycle with query 38 val valid = Bool() // valid is generated 1 cycle after query request 39 val data = UInt(8.W) // data is generated 1 cycle after query request 40} 41 42// inflight miss block reqs 43class InflightBlockInfo(implicit p: Parameters) extends XSBundle { 44 val block_addr = UInt(PAddrBits.W) 45 val valid = Bool() 46} 47 48class LsqEnqIO(implicit p: Parameters) extends XSBundle { 49 val canAccept = Output(Bool()) 50 val needAlloc = Vec(RenameWidth, Input(UInt(2.W))) 51 val req = Vec(RenameWidth, Flipped(ValidIO(new MicroOp))) 52 val resp = Vec(RenameWidth, Output(new LSIdx)) 53} 54 55// Load / Store Queue Wrapper for XiangShan Out of Order LSU 56class LsqWrappper(implicit p: Parameters) extends XSModule with HasDCacheParameters { 57 val io = IO(new Bundle() { 58 val enq = new LsqEnqIO 59 val brqRedirect = Flipped(ValidIO(new Redirect)) 60 val loadIn = Vec(LoadPipelineWidth, Flipped(Valid(new LsPipelineBundle))) 61 val storeIn = Vec(StorePipelineWidth, Flipped(Valid(new LsPipelineBundle))) 62 val storeDataIn = Vec(StorePipelineWidth, Flipped(Valid(new StoreDataBundle))) // store data, send to sq from rs 63 val loadDataForwarded = Vec(LoadPipelineWidth, Input(Bool())) 64 val needReplayFromRS = Vec(LoadPipelineWidth, Input(Bool())) 65 val sbuffer = Vec(StorePipelineWidth, Decoupled(new DCacheWordReqWithVaddr)) 66 val ldout = Vec(2, DecoupledIO(new ExuOutput)) // writeback int load 67 val mmioStout = DecoupledIO(new ExuOutput) // writeback uncached store 68 val forward = Vec(LoadPipelineWidth, Flipped(new PipeLoadForwardQueryIO)) 69 val loadViolationQuery = Vec(LoadPipelineWidth, Flipped(new LoadViolationQueryIO)) 70 val rob = Flipped(new RobLsqIO) 71 val rollback = Output(Valid(new Redirect)) 72 val dcache = Flipped(ValidIO(new Refill)) 73 val release = Flipped(ValidIO(new Release)) 74 val uncache = new DCacheWordIO 75 val exceptionAddr = new ExceptionAddrIO 76 val sqempty = Output(Bool()) 77 val issuePtrExt = Output(new SqPtr) 78 val sqFull = Output(Bool()) 79 val lqFull = Output(Bool()) 80 }) 81 82 val loadQueue = Module(new LoadQueue) 83 val storeQueue = Module(new StoreQueue) 84 85 // io.enq logic 86 // LSQ: send out canAccept when both load queue and store queue are ready 87 // Dispatch: send instructions to LSQ only when they are ready 88 io.enq.canAccept := loadQueue.io.enq.canAccept && storeQueue.io.enq.canAccept 89 loadQueue.io.enq.sqCanAccept := storeQueue.io.enq.canAccept 90 storeQueue.io.enq.lqCanAccept := loadQueue.io.enq.canAccept 91 for (i <- 0 until RenameWidth) { 92 loadQueue.io.enq.needAlloc(i) := io.enq.needAlloc(i)(0) 93 loadQueue.io.enq.req(i).valid := io.enq.needAlloc(i)(0) && io.enq.req(i).valid 94 loadQueue.io.enq.req(i).bits := io.enq.req(i).bits 95 96 storeQueue.io.enq.needAlloc(i) := io.enq.needAlloc(i)(1) 97 storeQueue.io.enq.req(i).valid := io.enq.needAlloc(i)(1) && io.enq.req(i).valid 98 storeQueue.io.enq.req(i).bits := io.enq.req(i).bits 99 100 io.enq.resp(i).lqIdx := loadQueue.io.enq.resp(i) 101 io.enq.resp(i).sqIdx := storeQueue.io.enq.resp(i) 102 } 103 104 // load queue wiring 105 loadQueue.io.brqRedirect <> io.brqRedirect 106 loadQueue.io.loadIn <> io.loadIn 107 loadQueue.io.storeIn <> io.storeIn 108 loadQueue.io.loadDataForwarded <> io.loadDataForwarded 109 loadQueue.io.needReplayFromRS <> io.needReplayFromRS 110 loadQueue.io.ldout <> io.ldout 111 loadQueue.io.rob <> io.rob 112 loadQueue.io.rollback <> io.rollback 113 loadQueue.io.dcache <> io.dcache 114 loadQueue.io.release <> io.release 115 loadQueue.io.exceptionAddr.lsIdx := io.exceptionAddr.lsIdx 116 loadQueue.io.exceptionAddr.isStore := DontCare 117 118 // store queue wiring 119 // storeQueue.io <> DontCare 120 storeQueue.io.brqRedirect <> io.brqRedirect 121 storeQueue.io.storeIn <> io.storeIn 122 storeQueue.io.storeDataIn <> io.storeDataIn 123 storeQueue.io.sbuffer <> io.sbuffer 124 storeQueue.io.mmioStout <> io.mmioStout 125 storeQueue.io.rob <> io.rob 126 storeQueue.io.exceptionAddr.lsIdx := io.exceptionAddr.lsIdx 127 storeQueue.io.exceptionAddr.isStore := DontCare 128 storeQueue.io.issuePtrExt <> io.issuePtrExt 129 130 loadQueue.io.load_s1 <> io.forward 131 storeQueue.io.forward <> io.forward // overlap forwardMask & forwardData, DO NOT CHANGE SEQUENCE 132 133 loadQueue.io.loadViolationQuery <> io.loadViolationQuery 134 135 storeQueue.io.sqempty <> io.sqempty 136 137 io.exceptionAddr.vaddr := Mux(io.exceptionAddr.isStore, storeQueue.io.exceptionAddr.vaddr, loadQueue.io.exceptionAddr.vaddr) 138 139 // naive uncache arbiter 140 val s_idle :: s_load :: s_store :: Nil = Enum(3) 141 val pendingstate = RegInit(s_idle) 142 143 switch(pendingstate){ 144 is(s_idle){ 145 when(io.uncache.req.fire()){ 146 pendingstate := Mux(loadQueue.io.uncache.req.valid, s_load, s_store) 147 } 148 } 149 is(s_load){ 150 when(io.uncache.resp.fire()){ 151 pendingstate := s_idle 152 } 153 } 154 is(s_store){ 155 when(io.uncache.resp.fire()){ 156 pendingstate := s_idle 157 } 158 } 159 } 160 161 loadQueue.io.uncache := DontCare 162 storeQueue.io.uncache := DontCare 163 loadQueue.io.uncache.resp.valid := false.B 164 storeQueue.io.uncache.resp.valid := false.B 165 when(loadQueue.io.uncache.req.valid){ 166 io.uncache.req <> loadQueue.io.uncache.req 167 }.otherwise{ 168 io.uncache.req <> storeQueue.io.uncache.req 169 } 170 when(pendingstate === s_load){ 171 io.uncache.resp <> loadQueue.io.uncache.resp 172 }.otherwise{ 173 io.uncache.resp <> storeQueue.io.uncache.resp 174 } 175 176 assert(!(loadQueue.io.uncache.req.valid && storeQueue.io.uncache.req.valid)) 177 assert(!(loadQueue.io.uncache.resp.valid && storeQueue.io.uncache.resp.valid)) 178 assert(!((loadQueue.io.uncache.resp.valid || storeQueue.io.uncache.resp.valid) && pendingstate === s_idle)) 179 180 io.lqFull := loadQueue.io.lqFull 181 io.sqFull := storeQueue.io.sqFull 182} 183