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.cache.mmu 18 19import org.chipsalliance.cde.config.Parameters 20import chisel3._ 21import chisel3.util._ 22import difftest._ 23import freechips.rocketchip.util.SRAMAnnotation 24import xiangshan._ 25import utils._ 26import utility._ 27import xiangshan.backend.fu.{PMPChecker, PMPReqBundle, PMPConfig => XSPMPConfig} 28import xiangshan.backend.rob.RobPtr 29import xiangshan.backend.fu.util.HasCSRConst 30import freechips.rocketchip.rocket.PMPConfig 31 32/** TLB module 33 * support block request and non-block request io at the same time 34 * return paddr at next cycle, then go for pmp/pma check 35 * @param Width: The number of requestors 36 * @param Block: Blocked or not for each requestor ports 37 * @param q: TLB Parameters, like entry number, each TLB has its own parameters 38 * @param p: XiangShan Paramemters, like XLEN 39 */ 40 41class TLB(Width: Int, nRespDups: Int = 1, Block: Seq[Boolean], q: TLBParameters)(implicit p: Parameters) extends TlbModule 42 with HasCSRConst 43 with HasPerfEvents 44{ 45 val io = IO(new TlbIO(Width, nRespDups, q)) 46 47 val req = io.requestor.map(_.req) 48 val resp = io.requestor.map(_.resp) 49 val ptw = io.ptw 50 val pmp = io.pmp 51 val refill_to_mem = io.refill_to_mem 52 53 /** Sfence.vma & Svinval 54 * Sfence.vma will 1. flush old entries 2. flush inflight 3. flush pipe 55 * Svinval will 1. flush old entries 2. flush inflight 56 * So, Svinval will not flush pipe, which means 57 * it should not drop reqs from pipe and should return right resp 58 */ 59 val sfence = DelayN(io.sfence, q.fenceDelay) 60 val csr = io.csr 61 val satp = DelayN(io.csr.satp, q.fenceDelay) 62 val vsatp = DelayN(io.csr.vsatp, q.fenceDelay) 63 val hgatp = DelayN(io.csr.hgatp, q.fenceDelay) 64 val mPBMTE = DelayN(io.csr.mPBMTE, q.fenceDelay) 65 val hPBMTE = DelayN(io.csr.hPBMTE, q.fenceDelay) 66 67 val flush_mmu = DelayN(sfence.valid || csr.satp.changed || csr.vsatp.changed || csr.hgatp.changed, q.fenceDelay) 68 val mmu_flush_pipe = DelayN(sfence.valid && sfence.bits.flushPipe, q.fenceDelay) // for svinval, won't flush pipe 69 val flush_pipe = io.flushPipe 70 val redirect = io.redirect 71 val req_in = req 72 val req_out = req.map(a => RegEnable(a.bits, a.fire)) 73 val req_out_v = (0 until Width).map(i => ValidHold(req_in(i).fire && !req_in(i).bits.kill, resp(i).fire, flush_pipe(i))) 74 75 val isHyperInst = (0 until Width).map(i => req_out_v(i) && req_out(i).hyperinst) 76 77 // ATTENTION: csr and flush from backend are delayed. csr should not be later than flush. 78 // because, csr will influence tlb behavior. 79 val ifecth = if (q.fetchi) true.B else false.B 80 val mode_tmp = if (q.useDmode) csr.priv.dmode else csr.priv.imode 81 val mode = (0 until Width).map(i => Mux(isHyperInst(i), csr.priv.spvp, mode_tmp)) 82 val virt_in = csr.priv.virt 83 val virt_out = req.map(a => RegEnable(csr.priv.virt, a.fire)) 84 val sum = (0 until Width).map(i => Mux(virt_out(i) || isHyperInst(i), io.csr.priv.vsum, io.csr.priv.sum)) 85 val mxr = (0 until Width).map(i => Mux(virt_out(i) || isHyperInst(i), io.csr.priv.vmxr || io.csr.priv.mxr, io.csr.priv.mxr)) 86 val req_in_s2xlate = (0 until Width).map(i => MuxCase(noS2xlate, Seq( 87 (!(virt_in || req_in(i).bits.hyperinst)) -> noS2xlate, 88 (csr.vsatp.mode =/= 0.U && csr.hgatp.mode =/= 0.U) -> allStage, 89 (csr.vsatp.mode === 0.U) -> onlyStage2, 90 (csr.hgatp.mode === 0.U) -> onlyStage1 91 ))) 92 val req_out_s2xlate = (0 until Width).map(i => MuxCase(noS2xlate, Seq( 93 (!(virt_out(i) || isHyperInst(i))) -> noS2xlate, 94 (csr.vsatp.mode =/= 0.U && csr.hgatp.mode =/= 0.U) -> allStage, 95 (csr.vsatp.mode === 0.U) -> onlyStage2, 96 (csr.hgatp.mode === 0.U) -> onlyStage1 97 ))) 98 val need_gpa = RegInit(false.B) 99 val need_gpa_robidx = Reg(new RobPtr) 100 val need_gpa_vpn = Reg(UInt(vpnLen.W)) 101 val resp_gpa_gvpn = Reg(UInt(ptePPNLen.W)) 102 val resp_gpa_refill = RegInit(false.B) 103 val resp_s1_level = RegInit(0.U(log2Up(Level + 1).W)) 104 val resp_s1_isLeaf = RegInit(false.B) 105 val resp_s1_isFakePte = RegInit(false.B) 106 val hasGpf = Wire(Vec(Width, Bool())) 107 108 val Sv39Enable = satp.mode === 8.U 109 val Sv48Enable = satp.mode === 9.U 110 val Sv39x4Enable = vsatp.mode === 8.U || hgatp.mode === 8.U 111 val Sv48x4Enable = vsatp.mode === 9.U || hgatp.mode === 9.U 112 val vmEnable = (0 until Width).map(i => !(isHyperInst(i) || virt_out(i)) && ( 113 if (EnbaleTlbDebug) (Sv39Enable || Sv48Enable) 114 else (Sv39Enable || Sv48Enable) && (mode(i) < ModeM)) 115 ) 116 val s2xlateEnable = (0 until Width).map(i => (isHyperInst(i) || virt_out(i)) && (Sv39x4Enable || Sv48x4Enable) && (mode(i) < ModeM)) 117 val portTranslateEnable = (0 until Width).map(i => (vmEnable(i) || s2xlateEnable(i)) && RegEnable(!req(i).bits.no_translate, req(i).valid)) 118 119 // pre fault: check fault before real do translate 120 val prepf = WireInit(VecInit(Seq.fill(Width)(false.B))) 121 val pregpf = WireInit(VecInit(Seq.fill(Width)(false.B))) 122 val preaf = WireInit(VecInit(Seq.fill(Width)(false.B))) 123 val prevmEnable = (0 until Width).map(i => !(virt_in || req_in(i).bits.hyperinst) && ( 124 if (EnbaleTlbDebug) (Sv39Enable || Sv48Enable) 125 else (Sv39Enable || Sv48Enable) && (mode(i) < ModeM)) 126 ) 127 val pres2xlateEnable = (0 until Width).map(i => (virt_in || req_in(i).bits.hyperinst) && (Sv39x4Enable || Sv48x4Enable) && (mode(i) < ModeM)) 128 (0 until Width).foreach{i => 129 val pf48 = SignExt(req(i).bits.fullva(47, 0), XLEN) =/= req(i).bits.fullva 130 val pf39 = SignExt(req(i).bits.fullva(38, 0), XLEN) =/= req(i).bits.fullva 131 val gpf48 = req(i).bits.fullva(XLEN - 1, 48 + 2) =/= 0.U 132 val gpf39 = req(i).bits.fullva(XLEN - 1, 39 + 2) =/= 0.U 133 val af = req(i).bits.fullva(XLEN - 1, PAddrBits) =/= 0.U 134 when (req(i).valid && req(i).bits.checkfullva) { 135 when (prevmEnable(i) || pres2xlateEnable(i)) { 136 when (req_in_s2xlate(i) === onlyStage2) { 137 when (Sv48x4Enable) { 138 pregpf(i) := gpf48 139 } .elsewhen (Sv39x4Enable) { 140 pregpf(i) := gpf39 141 } 142 } .otherwise { 143 when (Sv48Enable) { 144 prepf(i) := pf48 145 } .elsewhen (Sv39Enable) { 146 prepf(i) := pf39 147 } 148 } 149 } .otherwise { 150 preaf(i) := af 151 } 152 } 153 } 154 155 val refill = ptw.resp.fire && !(ptw.resp.bits.getGpa) && !flush_mmu 156 refill_to_mem := DontCare 157 val entries = Module(new TlbStorageWrapper(Width, q, nRespDups)) 158 entries.io.base_connect(sfence, csr, satp) 159 if (q.outReplace) { io.replace <> entries.io.replace } 160 for (i <- 0 until Width) { 161 entries.io.r_req_apply(io.requestor(i).req.valid, get_pn(req_in(i).bits.vaddr), i, req_in_s2xlate(i)) 162 entries.io.w_apply(refill, ptw.resp.bits) 163 // TODO: RegNext enable:req.valid 164 resp(i).bits.debug.isFirstIssue := RegEnable(req(i).bits.debug.isFirstIssue, req(i).valid) 165 resp(i).bits.debug.robIdx := RegEnable(req(i).bits.debug.robIdx, req(i).valid) 166 } 167 168 // read TLB, get hit/miss, paddr, perm bits 169 val readResult = (0 until Width).map(TLBRead(_)) 170 val hitVec = readResult.map(_._1) 171 val missVec = readResult.map(_._2) 172 val pmp_addr = readResult.map(_._3) 173 val perm = readResult.map(_._4) 174 val g_perm = readResult.map(_._5) 175 val pbmt = readResult.map(_._6) 176 val g_pbmt = readResult.map(_._7) 177 // check pmp use paddr (for timing optization, use pmp_addr here) 178 // check permisson 179 (0 until Width).foreach{i => 180 val noTranslateReg = RegNext(req(i).bits.no_translate) 181 val addr = Mux(noTranslateReg, req(i).bits.pmp_addr, pmp_addr(i)) 182 pmp_check(addr, req_out(i).size, req_out(i).cmd, noTranslateReg, i) 183 for (d <- 0 until nRespDups) { 184 pbmt_check(i, d, pbmt(i)(d), g_pbmt(i)(d), req_out_s2xlate(i)) 185 perm_check(perm(i)(d), req_out(i).cmd, i, d, g_perm(i)(d), req_out(i).hlvx, req_out_s2xlate(i), prepf(i), pregpf(i), preaf(i)) 186 } 187 hasGpf(i) := hitVec(i) && (resp(i).bits.excp(0).gpf.ld || resp(i).bits.excp(0).gpf.st || resp(i).bits.excp(0).gpf.instr) 188 } 189 190 // handle block or non-block io 191 // for non-block io, just return the above result, send miss to ptw 192 // for block io, hold the request, send miss to ptw, 193 // when ptw back, return the result 194 (0 until Width) foreach {i => 195 if (Block(i)) handle_block(i) 196 else handle_nonblock(i) 197 } 198 io.ptw.resp.ready := true.B 199 200 /************************ main body above | method/log/perf below ****************************/ 201 def TLBRead(i: Int) = { 202 val (e_hit, e_ppn, e_perm, e_g_perm, e_s2xlate, e_pbmt, e_g_pbmt) = entries.io.r_resp_apply(i) 203 val (p_hit, p_ppn, p_pbmt, p_perm, p_gvpn, p_g_pbmt, p_g_perm, p_s2xlate, p_s1_level, p_s1_isLeaf, p_s1_isFakePte) = ptw_resp_bypass(get_pn(req_in(i).bits.vaddr), req_in_s2xlate(i)) 204 val enable = portTranslateEnable(i) 205 val isOnlys2xlate = req_out_s2xlate(i) === onlyStage2 206 val need_gpa_vpn_hit = need_gpa_vpn === get_pn(req_out(i).vaddr) 207 val isitlb = TlbCmd.isExec(req_out(i).cmd) 208 val isPrefetch = req_out(i).isPrefetch 209 val currentRedirect = req_out(i).debug.robIdx.needFlush(redirect) 210 val lastCycleRedirect = req_out(i).debug.robIdx.needFlush(RegNext(redirect)) 211 212 when (!isitlb && need_gpa_robidx.needFlush(redirect) || isitlb && flush_pipe(i)){ 213 need_gpa := false.B 214 resp_gpa_refill := false.B 215 need_gpa_vpn := 0.U 216 }.elsewhen (req_out_v(i) && !p_hit && !(resp_gpa_refill && need_gpa_vpn_hit) && !isOnlys2xlate && hasGpf(i) && need_gpa === false.B && !io.requestor(i).req_kill && !isPrefetch && !currentRedirect && !lastCycleRedirect) { 217 need_gpa := true.B 218 need_gpa_vpn := get_pn(req_out(i).vaddr) 219 resp_gpa_refill := false.B 220 need_gpa_robidx := req_out(i).debug.robIdx 221 }.elsewhen (ptw.resp.fire && need_gpa && need_gpa_vpn === ptw.resp.bits.getVpn(need_gpa_vpn)) { 222 resp_gpa_gvpn := Mux(ptw.resp.bits.s2xlate === onlyStage2, ptw.resp.bits.s2.entry.tag, ptw.resp.bits.s1.genGVPN(need_gpa_vpn)) 223 resp_s1_level := ptw.resp.bits.s1.entry.level.get 224 resp_s1_isLeaf := ptw.resp.bits.s1.isLeaf() 225 resp_s1_isFakePte := ptw.resp.bits.s1.isFakePte() 226 resp_gpa_refill := true.B 227 } 228 229 when (req_out_v(i) && hasGpf(i) && resp_gpa_refill && need_gpa_vpn_hit){ 230 need_gpa := false.B 231 } 232 233 val hit = e_hit || p_hit 234 val miss = (!hit && enable) || hasGpf(i) && !p_hit && !(resp_gpa_refill && need_gpa_vpn_hit) && !isOnlys2xlate && !isPrefetch && !lastCycleRedirect 235 hit.suggestName(s"hit_read_${i}") 236 miss.suggestName(s"miss_read_${i}") 237 238 val vaddr = SignExt(req_out(i).vaddr, PAddrBits) 239 resp(i).bits.miss := miss 240 resp(i).bits.ptwBack := ptw.resp.fire 241 resp(i).bits.memidx := RegEnable(req_in(i).bits.memidx, req_in(i).valid) 242 resp(i).bits.fastMiss := !hit && enable 243 244 val ppn = WireInit(VecInit(Seq.fill(nRespDups)(0.U(ppnLen.W)))) 245 val pbmt = WireInit(VecInit(Seq.fill(nRespDups)(0.U(ptePbmtLen.W)))) 246 val perm = WireInit(VecInit(Seq.fill(nRespDups)(0.U.asTypeOf(new TlbPermBundle)))) 247 val gvpn = WireInit(VecInit(Seq.fill(nRespDups)(0.U(ptePPNLen.W)))) 248 val level = WireInit(VecInit(Seq.fill(nRespDups)(0.U(log2Up(Level + 1).W)))) 249 val isLeaf = WireInit(VecInit(Seq.fill(nRespDups)(false.B))) 250 val isFakePte = WireInit(VecInit(Seq.fill(nRespDups)(false.B))) 251 val g_pbmt = WireInit(VecInit(Seq.fill(nRespDups)(0.U(ptePbmtLen.W)))) 252 val g_perm = WireInit(VecInit(Seq.fill(nRespDups)(0.U.asTypeOf(new TlbPermBundle)))) 253 val r_s2xlate = WireInit(VecInit(Seq.fill(nRespDups)(0.U(2.W)))) 254 for (d <- 0 until nRespDups) { 255 ppn(d) := Mux(p_hit, p_ppn, e_ppn(d)) 256 pbmt(d) := Mux(p_hit, p_pbmt, e_pbmt(d)) 257 perm(d) := Mux(p_hit, p_perm, e_perm(d)) 258 gvpn(d) := Mux(p_hit, p_gvpn, resp_gpa_gvpn) 259 level(d) := Mux(p_hit, p_s1_level, resp_s1_level) 260 isLeaf(d) := Mux(p_hit, p_s1_isLeaf, resp_s1_isLeaf) 261 isFakePte(d) := Mux(p_hit, p_s1_isFakePte, resp_s1_isFakePte) 262 g_pbmt(d) := Mux(p_hit, p_g_pbmt, e_g_pbmt(d)) 263 g_perm(d) := Mux(p_hit, p_g_perm, e_g_perm(d)) 264 r_s2xlate(d) := Mux(p_hit, p_s2xlate, e_s2xlate(d)) 265 val paddr = Cat(ppn(d), get_off(req_out(i).vaddr)) 266 val vpn_idx = Mux1H(Seq( 267 (isFakePte(d) && vsatp.mode === Sv39) -> 2.U, 268 (isFakePte(d) && vsatp.mode === Sv48) -> 3.U, 269 (!isFakePte(d)) -> (level(d) - 1.U), 270 )) 271 // We use `fullva` here when `isLeaf`, in order to cope with the situation of an unaligned load/store cross page 272 // for example, a `ld` instruction on address 0x81000ffb will be splited into two loads 273 // 1. ld 0x81000ff8. vaddr = 0x81000ff8, fullva = 0x80000ffb 274 // 2. ld 0x81001000. vaddr = 0x81001000, fullva = 0x80000ffb 275 // When load 1 trigger a guest page fault, we should use offset of fullva when generate gpaddr 276 // and when load 2 trigger a guest page fault, we should just use offset of vaddr(all zero). 277 // Whether cross-page will be determined in misalign buffer(situation 2) so we only need to judge situation 1 here. 278 val gpaddr_offset = Mux(isLeaf(d), get_off(req_out(i).fullva), Cat(getVpnn(get_pn(req_out(i).fullva), vpn_idx), 0.U(log2Up(XLEN/8).W))) 279 val gpaddr = Cat(gvpn(d), gpaddr_offset) 280 resp(i).bits.paddr(d) := Mux(enable, paddr, vaddr) 281 resp(i).bits.gpaddr(d) := Mux(r_s2xlate(d) === onlyStage2, vaddr, gpaddr) 282 } 283 284 XSDebug(req_out_v(i), p"(${i.U}) hit:${hit} miss:${miss} ppn:${Hexadecimal(ppn(0))} perm:${perm(0)}\n") 285 286 val pmp_paddr = resp(i).bits.paddr(0) 287 288 (hit, miss, pmp_paddr, perm, g_perm, pbmt, g_pbmt) 289 } 290 291 def getVpnn(vpn: UInt, idx: UInt): UInt = { 292 MuxLookup(idx, 0.U)(Seq( 293 0.U -> vpn(vpnnLen - 1, 0), 294 1.U -> vpn(vpnnLen * 2 - 1, vpnnLen), 295 2.U -> vpn(vpnnLen * 3 - 1, vpnnLen * 2), 296 3.U -> vpn(vpnnLen * 4 - 1, vpnnLen * 3)) 297 ) 298 } 299 300 def pmp_check(addr: UInt, size: UInt, cmd: UInt, noTranslate: Bool, idx: Int): Unit = { 301 pmp(idx).valid := resp(idx).valid || noTranslate 302 pmp(idx).bits.addr := addr 303 pmp(idx).bits.size := size 304 pmp(idx).bits.cmd := cmd 305 } 306 307 def pbmt_check(idx: Int, d: Int, pbmt: UInt, g_pbmt: UInt, s2xlate: UInt):Unit = { 308 val onlyS1 = s2xlate === onlyStage1 || s2xlate === noS2xlate 309 val pbmtRes = pbmt 310 val gpbmtRes = g_pbmt 311 val res = MuxLookup(s2xlate, 0.U)(Seq( 312 onlyStage1 -> pbmtRes, 313 onlyStage2 -> gpbmtRes, 314 allStage -> Mux(pbmtRes =/= 0.U, pbmtRes, gpbmtRes), 315 noS2xlate -> pbmtRes 316 )) 317 resp(idx).bits.pbmt(d) := Mux(portTranslateEnable(idx), res, 0.U) 318 } 319 320 // for timing optimization, pmp check is divided into dynamic and static 321 def perm_check(perm: TlbPermBundle, cmd: UInt, idx: Int, nDups: Int, g_perm: TlbPermBundle, hlvx: Bool, s2xlate: UInt, prepf: Bool = false.B, pregpf: Bool = false.B, preaf: Bool = false.B) = { 322 // dynamic: superpage (or full-connected reg entries) -> check pmp when translation done 323 // static: 4K pages (or sram entries) -> check pmp with pre-checked results 324 val hasS2xlate = s2xlate =/= noS2xlate 325 val onlyS1 = s2xlate === onlyStage1 326 val onlyS2 = s2xlate === onlyStage2 327 val af = perm.af || (hasS2xlate && g_perm.af) 328 329 // Stage 1 perm check 330 val pf = perm.pf 331 val isLd = TlbCmd.isRead(cmd) && !TlbCmd.isAmo(cmd) 332 val isSt = TlbCmd.isWrite(cmd) || TlbCmd.isAmo(cmd) 333 val isInst = TlbCmd.isExec(cmd) 334 val ldUpdate = !perm.a && isLd // update A/D through exception 335 val stUpdate = (!perm.a || !perm.d) && isSt // update A/D through exception 336 val instrUpdate = !perm.a && isInst // update A/D through exception 337 val modeCheck = !(mode(idx) === ModeU && !perm.u || mode(idx) === ModeS && perm.u && (!sum(idx) || ifecth)) 338 val ldPermFail = !(modeCheck && Mux(hlvx, perm.x, perm.r || mxr(idx) && perm.x)) 339 val stPermFail = !(modeCheck && perm.w) 340 val instrPermFail = !(modeCheck && perm.x) 341 val ldPf = (ldPermFail || pf) && isLd 342 val stPf = (stPermFail || pf) && isSt 343 val instrPf = (instrPermFail || pf) && isInst 344 val isFakePte = !perm.v && !perm.pf && !perm.af && !onlyS2 345 val isNonLeaf = !(perm.r || perm.w || perm.x) && perm.v && !perm.pf && !perm.af 346 val s1_valid = portTranslateEnable(idx) && !onlyS2 347 348 // Stage 2 perm check 349 val gpf = g_perm.pf 350 val g_ldUpdate = !g_perm.a && isLd 351 val g_stUpdate = (!g_perm.a || !g_perm.d) && isSt 352 val g_instrUpdate = !g_perm.a && isInst 353 val g_ldPermFail = !Mux(hlvx, g_perm.x, (g_perm.r || io.csr.priv.mxr && g_perm.x)) 354 val g_stPermFail = !g_perm.w 355 val g_instrPermFail = !g_perm.x 356 val ldGpf = (g_ldPermFail || gpf) && isLd 357 val stGpf = (g_stPermFail || gpf) && isSt 358 val instrGpf = (g_instrPermFail || gpf) && isInst 359 val s2_valid = portTranslateEnable(idx) && hasS2xlate && !onlyS1 360 361 val fault_valid = s1_valid || s2_valid 362 363 // when pf and gpf can't happens simultaneously 364 val hasPf = (ldPf || ldUpdate || stPf || stUpdate || instrPf || instrUpdate) && s1_valid && !af && !isFakePte && !isNonLeaf 365 // Only lsu need check related to high address truncation 366 when (RegNext(prepf || pregpf || preaf)) { 367 resp(idx).bits.isForVSnonLeafPTE := false.B 368 resp(idx).bits.excp(nDups).pf.ld := RegNext(prepf) && isLd 369 resp(idx).bits.excp(nDups).pf.st := RegNext(prepf) && isSt 370 resp(idx).bits.excp(nDups).pf.instr := false.B 371 372 resp(idx).bits.excp(nDups).gpf.ld := RegNext(pregpf) && isLd 373 resp(idx).bits.excp(nDups).gpf.st := RegNext(pregpf) && isSt 374 resp(idx).bits.excp(nDups).gpf.instr := false.B 375 376 resp(idx).bits.excp(nDups).af.ld := RegNext(preaf) && TlbCmd.isRead(cmd) 377 resp(idx).bits.excp(nDups).af.st := RegNext(preaf) && TlbCmd.isWrite(cmd) 378 resp(idx).bits.excp(nDups).af.instr := false.B 379 380 resp(idx).bits.excp(nDups).vaNeedExt := false.B 381 // overwrite miss & gpaddr when exception related to high address truncation happens 382 resp(idx).bits.miss := false.B 383 resp(idx).bits.gpaddr(nDups) := RegNext(req(idx).bits.fullva) 384 } .otherwise { 385 // isForVSnonLeafPTE is used only when gpf happens and it caused by a G-stage translation which supports VS-stage translation 386 // it will be sent to CSR in order to modify the m/htinst. 387 // Ref: The RISC-V Instruction Set Manual: Volume II: Privileged Architecture - 19.6.3. Transformed Instruction or Pseudoinstruction for mtinst or htinst 388 val isForVSnonLeafPTE = isNonLeaf || isFakePte 389 resp(idx).bits.isForVSnonLeafPTE := isForVSnonLeafPTE 390 resp(idx).bits.excp(nDups).pf.ld := (ldPf || ldUpdate) && s1_valid && !af && !isFakePte && !isNonLeaf 391 resp(idx).bits.excp(nDups).pf.st := (stPf || stUpdate) && s1_valid && !af && !isFakePte && !isNonLeaf 392 resp(idx).bits.excp(nDups).pf.instr := (instrPf || instrUpdate) && s1_valid && !af && !isFakePte && !isNonLeaf 393 // NOTE: pf need && with !af, page fault has higher priority than access fault 394 // but ptw may also have access fault, then af happens, the translation is wrong. 395 // In this case, pf has lower priority than af 396 397 resp(idx).bits.excp(nDups).gpf.ld := (ldGpf || g_ldUpdate) && s2_valid && !af && !hasPf 398 resp(idx).bits.excp(nDups).gpf.st := (stGpf || g_stUpdate) && s2_valid && !af && !hasPf 399 resp(idx).bits.excp(nDups).gpf.instr := (instrGpf || g_instrUpdate) && s2_valid && !af && !hasPf 400 401 resp(idx).bits.excp(nDups).af.ld := af && TlbCmd.isRead(cmd) && fault_valid 402 resp(idx).bits.excp(nDups).af.st := af && TlbCmd.isWrite(cmd) && fault_valid 403 resp(idx).bits.excp(nDups).af.instr := af && TlbCmd.isExec(cmd) && fault_valid 404 405 resp(idx).bits.excp(nDups).vaNeedExt := true.B 406 } 407 408 resp(idx).bits.excp(nDups).isHyper := isHyperInst(idx) 409 } 410 411 def handle_nonblock(idx: Int): Unit = { 412 io.requestor(idx).resp.valid := req_out_v(idx) 413 io.requestor(idx).req.ready := io.requestor(idx).resp.ready // should always be true 414 XSError(!io.requestor(idx).resp.ready, s"${q.name} port ${idx} is non-block, resp.ready must be true.B") 415 416 val req_need_gpa = hasGpf(idx) 417 val req_s2xlate = Wire(UInt(2.W)) 418 req_s2xlate := MuxCase(noS2xlate, Seq( 419 (!(virt_out(idx) || req_out(idx).hyperinst)) -> noS2xlate, 420 (csr.vsatp.mode =/= 0.U && csr.hgatp.mode =/= 0.U) -> allStage, 421 (csr.vsatp.mode === 0.U) -> onlyStage2, 422 (csr.hgatp.mode === 0.U || req_need_gpa) -> onlyStage1 423 )) 424 425 val ptw_just_back = ptw.resp.fire && req_s2xlate === ptw.resp.bits.s2xlate && ptw.resp.bits.hit(get_pn(req_out(idx).vaddr), io.csr.satp.asid, io.csr.vsatp.asid, io.csr.hgatp.vmid, true, false) 426 // TODO: RegNext enable: ptw.resp.valid ? req.valid 427 val ptw_resp_bits_reg = RegEnable(ptw.resp.bits, ptw.resp.valid) 428 val ptw_already_back = GatedValidRegNext(ptw.resp.fire) && req_s2xlate === ptw_resp_bits_reg.s2xlate && ptw_resp_bits_reg.hit(get_pn(req_out(idx).vaddr), io.csr.satp.asid, io.csr.vsatp.asid, io.csr.hgatp.vmid, allType = true) 429 val ptw_getGpa = req_need_gpa && hitVec(idx) 430 val need_gpa_vpn_hit = need_gpa_vpn === get_pn(req_out(idx).vaddr) 431 io.ptw.req(idx).valid := req_out_v(idx) && missVec(idx) && !(ptw_just_back || ptw_already_back || (!need_gpa_vpn_hit && req_out_v(idx) && need_gpa && !resp_gpa_refill && ptw_getGpa)) // TODO: remove the regnext, timing 432 io.tlbreplay(idx) := req_out_v(idx) && missVec(idx) && (ptw_just_back || ptw_already_back || (!need_gpa_vpn_hit && req_out_v(idx) && need_gpa && !resp_gpa_refill && ptw_getGpa)) 433 when (io.requestor(idx).req_kill && GatedValidRegNext(io.requestor(idx).req.fire)) { 434 io.ptw.req(idx).valid := false.B 435 io.tlbreplay(idx) := true.B 436 } 437 io.ptw.req(idx).bits.vpn := get_pn(req_out(idx).vaddr) 438 io.ptw.req(idx).bits.s2xlate := req_s2xlate 439 io.ptw.req(idx).bits.getGpa := ptw_getGpa 440 io.ptw.req(idx).bits.memidx := req_out(idx).memidx 441 } 442 443 def handle_block(idx: Int): Unit = { 444 // three valid: 1.if exist a entry; 2.if sent to ptw; 3.unset resp.valid 445 io.requestor(idx).req.ready := !req_out_v(idx) || io.requestor(idx).resp.fire 446 // req_out_v for if there is a request, may long latency, fixme 447 448 // miss request entries 449 val req_need_gpa = hasGpf(idx) 450 val miss_req_vpn = get_pn(req_out(idx).vaddr) 451 val miss_req_memidx = req_out(idx).memidx 452 val miss_req_s2xlate = Wire(UInt(2.W)) 453 miss_req_s2xlate := MuxCase(noS2xlate, Seq( 454 (!(virt_out(idx) || req_out(idx).hyperinst)) -> noS2xlate, 455 (csr.vsatp.mode =/= 0.U && csr.hgatp.mode =/= 0.U) -> allStage, 456 (csr.vsatp.mode === 0.U) -> onlyStage2, 457 (csr.hgatp.mode === 0.U || req_need_gpa) -> onlyStage1 458 )) 459 val miss_req_s2xlate_reg = RegEnable(miss_req_s2xlate, io.ptw.req(idx).fire) 460 val hasS2xlate = miss_req_s2xlate_reg =/= noS2xlate 461 val onlyS2 = miss_req_s2xlate_reg === onlyStage2 462 val hit_s1 = io.ptw.resp.bits.s1.hit(miss_req_vpn, Mux(hasS2xlate, io.csr.vsatp.asid, io.csr.satp.asid), io.csr.hgatp.vmid, allType = true, false, hasS2xlate) 463 val hit_s2 = io.ptw.resp.bits.s2.hit(miss_req_vpn, io.csr.hgatp.vmid) 464 val hit = Mux(onlyS2, hit_s2, hit_s1) && io.ptw.resp.valid && miss_req_s2xlate_reg === io.ptw.resp.bits.s2xlate 465 466 val new_coming_valid = WireInit(false.B) 467 new_coming_valid := req_in(idx).fire && !req_in(idx).bits.kill && !flush_pipe(idx) 468 val new_coming = GatedValidRegNext(new_coming_valid) 469 val miss_wire = new_coming && missVec(idx) 470 val miss_v = ValidHoldBypass(miss_wire, resp(idx).fire, flush_pipe(idx)) 471 val miss_req_v = ValidHoldBypass(miss_wire || (miss_v && flush_mmu && !mmu_flush_pipe), 472 io.ptw.req(idx).fire || resp(idx).fire, flush_pipe(idx)) 473 474 // when ptw resp, check if hit, reset miss_v, resp to lsu/ifu 475 resp(idx).valid := req_out_v(idx) && !(miss_v && portTranslateEnable(idx)) 476 when (io.ptw.resp.fire && hit && req_out_v(idx) && portTranslateEnable(idx)) { 477 val stage1 = io.ptw.resp.bits.s1 478 val stage2 = io.ptw.resp.bits.s2 479 val s2xlate = io.ptw.resp.bits.s2xlate 480 resp(idx).valid := true.B 481 resp(idx).bits.miss := false.B 482 val s1_paddr = Cat(stage1.genPPN(get_pn(req_out(idx).vaddr)), get_off(req_out(idx).vaddr)) 483 val s2_paddr = Cat(stage2.genPPNS2(get_pn(req_out(idx).vaddr)), get_off(req_out(idx).vaddr)) 484 for (d <- 0 until nRespDups) { 485 resp(idx).bits.paddr(d) := Mux(s2xlate =/= noS2xlate, s2_paddr, s1_paddr) 486 resp(idx).bits.gpaddr(d) := s1_paddr 487 pbmt_check(idx, d, io.ptw.resp.bits.s1.entry.pbmt, io.ptw.resp.bits.s2.entry.pbmt, s2xlate) 488 perm_check(stage1, req_out(idx).cmd, idx, d, stage2, req_out(idx).hlvx, s2xlate) 489 } 490 pmp_check(resp(idx).bits.paddr(0), req_out(idx).size, req_out(idx).cmd, false.B, idx) 491 492 // NOTE: the unfiltered req would be handled by Repeater 493 } 494 assert(RegNext(!resp(idx).valid || resp(idx).ready, true.B), "when tlb resp valid, ready should be true, must") 495 assert(RegNext(req_out_v(idx) || !(miss_v || miss_req_v), true.B), "when not req_out_v, should not set miss_v/miss_req_v") 496 497 val ptw_req = io.ptw.req(idx) 498 ptw_req.valid := miss_req_v 499 ptw_req.bits.vpn := miss_req_vpn 500 ptw_req.bits.s2xlate := miss_req_s2xlate 501 ptw_req.bits.getGpa := req_need_gpa && hitVec(idx) 502 ptw_req.bits.memidx := miss_req_memidx 503 504 io.tlbreplay(idx) := false.B 505 506 // NOTE: when flush pipe, tlb should abandon last req 507 // however, some outside modules like icache, dont care flushPipe, and still waiting for tlb resp 508 // just resp valid and raise page fault to go through. The pipe(ifu) will abandon it. 509 if (!q.outsideRecvFlush) { 510 when (req_out_v(idx) && flush_pipe(idx) && portTranslateEnable(idx)) { 511 resp(idx).valid := true.B 512 for (d <- 0 until nRespDups) { 513 resp(idx).bits.pbmt(d) := 0.U 514 resp(idx).bits.excp(d).pf.ld := true.B // sfence happened, pf for not to use this addr 515 resp(idx).bits.excp(d).pf.st := true.B 516 resp(idx).bits.excp(d).pf.instr := true.B 517 } 518 } 519 } 520 } 521 522 // when ptw resp, tlb at refill_idx maybe set to miss by force. 523 // Bypass ptw resp to check. 524 def ptw_resp_bypass(vpn: UInt, s2xlate: UInt) = { 525 // TODO: RegNext enable: ptw.resp.valid 526 val hasS2xlate = s2xlate =/= noS2xlate 527 val onlyS2 = s2xlate === onlyStage2 528 val onlyS1 = s2xlate === onlyStage1 529 val s2xlate_hit = s2xlate === ptw.resp.bits.s2xlate 530 val resp_hit = ptw.resp.bits.hit(vpn, io.csr.satp.asid, io.csr.vsatp.asid, io.csr.hgatp.vmid, true, false) 531 val p_hit = GatedValidRegNext(resp_hit && io.ptw.resp.fire && s2xlate_hit) 532 val ppn_s1 = ptw.resp.bits.s1.genPPN(vpn) 533 val gvpn = Mux(onlyS2, vpn, ppn_s1) 534 val ppn_s2 = ptw.resp.bits.s2.genPPNS2(gvpn) 535 val p_ppn = RegEnable(Mux(s2xlate === onlyStage2 || s2xlate === allStage, ppn_s2, ppn_s1), io.ptw.resp.fire) 536 val p_pbmt = RegEnable(ptw.resp.bits.s1.entry.pbmt,io.ptw.resp.fire) 537 val p_perm = RegEnable(ptwresp_to_tlbperm(ptw.resp.bits.s1), io.ptw.resp.fire) 538 val p_gvpn = RegEnable(Mux(onlyS2, ptw.resp.bits.s2.entry.tag, ptw.resp.bits.s1.genGVPN(vpn)), io.ptw.resp.fire) 539 val p_g_pbmt = RegEnable(ptw.resp.bits.s2.entry.pbmt,io.ptw.resp.fire) 540 val p_g_perm = RegEnable(hptwresp_to_tlbperm(ptw.resp.bits.s2), io.ptw.resp.fire) 541 val p_s2xlate = RegEnable(ptw.resp.bits.s2xlate, io.ptw.resp.fire) 542 val p_s1_level = RegEnable(ptw.resp.bits.s1.entry.level.get, io.ptw.resp.fire) 543 val p_s1_isLeaf = RegEnable(ptw.resp.bits.s1.isLeaf(), io.ptw.resp.fire) 544 val p_s1_isFakePte = RegEnable(ptw.resp.bits.s1.isFakePte(), io.ptw.resp.fire) 545 (p_hit, p_ppn, p_pbmt, p_perm, p_gvpn, p_g_pbmt, p_g_perm, p_s2xlate, p_s1_level, p_s1_isLeaf, p_s1_isFakePte) 546 } 547 548 // perf event 549 val result_ok = req_in.map(a => GatedValidRegNext(a.fire)) 550 val perfEvents = 551 Seq( 552 ("access", PopCount((0 until Width).map{i => if (Block(i)) io.requestor(i).req.fire else portTranslateEnable(i) && result_ok(i) })), 553 ("miss ", PopCount((0 until Width).map{i => if (Block(i)) portTranslateEnable(i) && result_ok(i) && missVec(i) else ptw.req(i).fire })), 554 ) 555 generatePerfEvent() 556 557 // perf log 558 for (i <- 0 until Width) { 559 if (Block(i)) { 560 XSPerfAccumulate(s"access${i}",result_ok(i) && portTranslateEnable(i)) 561 XSPerfAccumulate(s"miss${i}", result_ok(i) && missVec(i)) 562 } else { 563 XSPerfAccumulate("first_access" + Integer.toString(i, 10), result_ok(i) && portTranslateEnable(i) && RegEnable(req(i).bits.debug.isFirstIssue, req(i).valid)) 564 XSPerfAccumulate("access" + Integer.toString(i, 10), result_ok(i) && portTranslateEnable(i)) 565 XSPerfAccumulate("first_miss" + Integer.toString(i, 10), result_ok(i) && portTranslateEnable(i) && missVec(i) && RegEnable(req(i).bits.debug.isFirstIssue, req(i).valid)) 566 XSPerfAccumulate("miss" + Integer.toString(i, 10), result_ok(i) && portTranslateEnable(i) && missVec(i)) 567 } 568 } 569 XSPerfAccumulate("ptw_resp_count", ptw.resp.fire) 570 XSPerfAccumulate("ptw_resp_pf_count", ptw.resp.fire && ptw.resp.bits.s1.pf) 571 572 // Log 573 for(i <- 0 until Width) { 574 XSDebug(req(i).valid, p"req(${i.U}): (${req(i).valid} ${req(i).ready}) ${req(i).bits}\n") 575 XSDebug(resp(i).valid, p"resp(${i.U}): (${resp(i).valid} ${resp(i).ready}) ${resp(i).bits}\n") 576 } 577 578 XSDebug(io.sfence.valid, p"Sfence: ${io.sfence}\n") 579 XSDebug(ParallelOR(req_out_v) || ptw.resp.valid, p"vmEnable:${vmEnable} hit:${Binary(VecInit(hitVec).asUInt)} miss:${Binary(VecInit(missVec).asUInt)}\n") 580 for (i <- ptw.req.indices) { 581 XSDebug(ptw.req(i).fire, p"L2TLB req:${ptw.req(i).bits}\n") 582 } 583 XSDebug(ptw.resp.valid, p"L2TLB resp:${ptw.resp.bits} (v:${ptw.resp.valid}r:${ptw.resp.ready}) \n") 584 585 println(s"${q.name}: page: ${q.NWays} ${q.Associative} ${q.Replacer.get}") 586 587 if (env.EnableDifftest) { 588 for (i <- 0 until Width) { 589 val pf = io.requestor(i).resp.bits.excp(0).pf.instr || io.requestor(i).resp.bits.excp(0).pf.st || io.requestor(i).resp.bits.excp(0).pf.ld 590 val gpf = io.requestor(i).resp.bits.excp(0).gpf.instr || io.requestor(i).resp.bits.excp(0).gpf.st || io.requestor(i).resp.bits.excp(0).gpf.ld 591 val af = io.requestor(i).resp.bits.excp(0).af.instr || io.requestor(i).resp.bits.excp(0).af.st || io.requestor(i).resp.bits.excp(0).af.ld 592 val difftest = DifftestModule(new DiffL1TLBEvent) 593 difftest.coreid := io.hartId 594 difftest.valid := RegNext(io.requestor(i).req.fire) && !io.requestor(i).req_kill && io.requestor(i).resp.fire && !io.requestor(i).resp.bits.miss && !pf && !af && !gpf && portTranslateEnable(i) 595 if (!Seq("itlb", "ldtlb", "sttlb").contains(q.name)) { 596 difftest.valid := false.B 597 } 598 difftest.index := TLBDiffId(p(XSCoreParamsKey).HartId).U 599 difftest.vpn := RegEnable(get_pn(req_in(i).bits.vaddr), req_in(i).valid) 600 difftest.ppn := get_pn(io.requestor(i).resp.bits.paddr(0)) 601 difftest.satp := Cat(io.csr.satp.mode, io.csr.satp.asid, io.csr.satp.ppn) 602 difftest.vsatp := Cat(io.csr.vsatp.mode, io.csr.vsatp.asid, io.csr.vsatp.ppn) 603 difftest.hgatp := Cat(io.csr.hgatp.mode, io.csr.hgatp.vmid, io.csr.hgatp.ppn) 604 val req_need_gpa = gpf 605 val req_s2xlate = Wire(UInt(2.W)) 606 req_s2xlate := MuxCase(noS2xlate, Seq( 607 (!RegNext(virt_in || req_in(i).bits.hyperinst)) -> noS2xlate, 608 (vsatp.mode =/= 0.U && hgatp.mode =/= 0.U) -> allStage, 609 (vsatp.mode === 0.U) -> onlyStage2, 610 (hgatp.mode === 0.U || req_need_gpa) -> onlyStage1 611 )) 612 difftest.s2xlate := req_s2xlate 613 } 614 } 615} 616 617object TLBDiffId { 618 var i: Int = 0 619 var lastHartId: Int = -1 620 def apply(hartId: Int): Int = { 621 if (lastHartId != hartId) { 622 i = 0 623 lastHartId = hartId 624 } 625 i += 1 626 i - 1 627 } 628} 629 630class TLBNonBlock(Width: Int, nRespDups: Int = 1, q: TLBParameters)(implicit p: Parameters) extends TLB(Width, nRespDups, Seq.fill(Width)(false), q) 631class TLBBLock(Width: Int, nRespDups: Int = 1, q: TLBParameters)(implicit p: Parameters) extends TLB(Width, nRespDups, Seq.fill(Width)(true), q) 632 633class TlbReplace(Width: Int, q: TLBParameters)(implicit p: Parameters) extends TlbModule { 634 val io = IO(new TlbReplaceIO(Width, q)) 635 636 if (q.Associative == "fa") { 637 val re = ReplacementPolicy.fromString(q.Replacer, q.NWays) 638 re.access(io.page.access.map(_.touch_ways)) 639 io.page.refillIdx := re.way 640 } else { // set-acco && plru 641 val re = ReplacementPolicy.fromString(q.Replacer, q.NSets, q.NWays) 642 re.access(io.page.access.map(_.sets), io.page.access.map(_.touch_ways)) 643 io.page.refillIdx := { if (q.NWays == 1) 0.U else re.way(io.page.chosen_set) } 644 } 645} 646