refactored dmem arbiter
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93f41d3359
commit
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@ -164,9 +164,10 @@ object Constants
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val PERM_BITS = 6;
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// rocketNBDCache parameters
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val DCACHE_PORTS = 2
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val CPU_DATA_BITS = 64;
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val CPU_TAG_BITS = 9;
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val DCACHE_TAG_BITS = 1 + CPU_TAG_BITS;
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val DCACHE_TAG_BITS = log2up(DCACHE_PORTS) + CPU_TAG_BITS
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val OFFSET_BITS = 6; // log2(cache line size in bytes)
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val NMSHR = 2; // number of primary misses
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val NRPQ = 16; // number of secondary misses
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@ -30,7 +30,7 @@ class rocketProc(resetSignal: Bool = null) extends Component(resetSignal)
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val itlb = new rocketITLB(ITLB_ENTRIES);
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val vitlb = new rocketITLB(ITLB_ENTRIES);
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val ptw = new rocketPTW();
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val arb = new rocketDmemArbiter();
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val arb = new rocketDmemArbiter(DCACHE_PORTS)
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var vu: vu = null
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if (HAVE_VEC)
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@ -93,8 +93,8 @@ class rocketProc(resetSignal: Bool = null) extends Component(resetSignal)
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dtlb.io.invalidate := dpath.io.ptbr_wen
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dtlb.io.status := dpath.io.ctrl.status
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arb.io.cpu.req_ppn := dtlb.io.cpu_resp.ppn;
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ctrl.io.dmem.req_rdy := dtlb.io.cpu_req.ready && arb.io.cpu.req_rdy;
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arb.io.requestor(0).req_ppn := dtlb.io.cpu_resp.ppn;
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ctrl.io.dmem.req_rdy := dtlb.io.cpu_req.ready && arb.io.requestor(0).req_rdy;
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// connect DTLB to D$ arbiter
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ctrl.io.xcpt_ma_ld := io.dmem.xcpt_ma_ld
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@ -104,8 +104,8 @@ class rocketProc(resetSignal: Bool = null) extends Component(resetSignal)
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ptw.io.dtlb <> dtlb.io.ptw;
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ptw.io.itlb <> itlb.io.ptw;
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ptw.io.ptbr := dpath.io.ptbr;
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arb.io.ptw <> ptw.io.dmem;
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arb.io.mem <> io.dmem
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arb.io.requestor(1) <> ptw.io.dmem
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arb.io.dmem <> io.dmem
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ctrl.io.dpath <> dpath.io.ctrl;
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dpath.io.host <> io.host;
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@ -129,22 +129,22 @@ class rocketProc(resetSignal: Bool = null) extends Component(resetSignal)
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io.imem.itlb_miss := itlb.io.cpu.resp_miss;
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// connect arbiter to ctrl+dpath+DTLB
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arb.io.cpu.req_val := ctrl.io.dmem.req_val;
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arb.io.cpu.req_cmd := ctrl.io.dmem.req_cmd;
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arb.io.cpu.req_type := ctrl.io.dmem.req_type;
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arb.io.cpu.req_kill := ctrl.io.dmem.req_kill;
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arb.io.cpu.req_idx := dpath.io.dmem.req_addr(PGIDX_BITS-1,0);
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arb.io.cpu.req_data := dpath.io.dmem.req_data;
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arb.io.cpu.req_tag := dpath.io.dmem.req_tag;
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ctrl.io.dmem.resp_miss := arb.io.cpu.resp_miss;
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ctrl.io.dmem.resp_replay:= arb.io.cpu.resp_replay;
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ctrl.io.dmem.resp_nack := arb.io.cpu.resp_nack;
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dpath.io.dmem.resp_val := arb.io.cpu.resp_val;
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dpath.io.dmem.resp_miss := arb.io.cpu.resp_miss;
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dpath.io.dmem.resp_replay := arb.io.cpu.resp_replay;
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arb.io.requestor(0).req_val := ctrl.io.dmem.req_val;
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arb.io.requestor(0).req_cmd := ctrl.io.dmem.req_cmd;
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arb.io.requestor(0).req_type := ctrl.io.dmem.req_type;
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arb.io.requestor(0).req_kill := ctrl.io.dmem.req_kill;
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arb.io.requestor(0).req_idx := dpath.io.dmem.req_addr(PGIDX_BITS-1,0);
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arb.io.requestor(0).req_data := dpath.io.dmem.req_data;
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arb.io.requestor(0).req_tag := dpath.io.dmem.req_tag;
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ctrl.io.dmem.resp_miss := arb.io.requestor(0).resp_miss;
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ctrl.io.dmem.resp_replay:= arb.io.requestor(0).resp_replay;
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ctrl.io.dmem.resp_nack := arb.io.requestor(0).resp_nack;
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dpath.io.dmem.resp_val := arb.io.requestor(0).resp_val;
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dpath.io.dmem.resp_miss := arb.io.requestor(0).resp_miss;
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dpath.io.dmem.resp_replay := arb.io.requestor(0).resp_replay;
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dpath.io.dmem.resp_type := io.dmem.resp_type;
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dpath.io.dmem.resp_tag := arb.io.cpu.resp_tag;
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dpath.io.dmem.resp_data := arb.io.cpu.resp_data;
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dpath.io.dmem.resp_tag := arb.io.requestor(0).resp_tag;
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dpath.io.dmem.resp_data := arb.io.requestor(0).resp_data;
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dpath.io.dmem.resp_data_subword := io.dmem.resp_data_subword;
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var fpu: rocketFPU = null
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@ -5,47 +5,63 @@ import Node._;
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import Constants._;
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import scala.math._;
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class ioDmemArbiter extends Bundle
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class ioDmemArbiter(n: Int) extends Bundle
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{
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val ptw = new ioDmem(List("req_val", "req_rdy", "req_cmd", "req_type", "req_idx", "req_ppn", "resp_data", "resp_val", "resp_replay", "resp_nack"));
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val cpu = new ioDmem();
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val mem = new ioDmem().flip();
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val dmem = new ioDmem().flip()
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val requestor = Vec(n) { new ioDmem() }
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}
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class rocketDmemArbiter extends Component
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class rocketDmemArbiter(n: Int) extends Component
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{
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val io = new ioDmemArbiter();
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// must delay ppn part of address from PTW by 1 cycle (to match TLB behavior)
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val r_ptw_req_val = Reg(io.ptw.req_val);
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val r_ptw_req_ppn = Reg(io.ptw.req_ppn);
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val r_cpu_req_val = Reg(io.cpu.req_val && io.cpu.req_rdy);
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io.mem.req_val := io.ptw.req_val || io.cpu.req_val;
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io.mem.req_cmd := Mux(io.ptw.req_val, io.ptw.req_cmd, io.cpu.req_cmd);
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io.mem.req_type := Mux(io.ptw.req_val, io.ptw.req_type, io.cpu.req_type);
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io.mem.req_idx := Mux(io.ptw.req_val, io.ptw.req_idx, io.cpu.req_idx);
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io.mem.req_ppn := Mux(r_ptw_req_val, r_ptw_req_ppn, io.cpu.req_ppn);
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io.mem.req_data := io.cpu.req_data;
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io.mem.req_tag := Cat(io.cpu.req_tag, io.ptw.req_val);
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io.mem.req_kill := io.cpu.req_kill && r_cpu_req_val;
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io.ptw.req_rdy := io.mem.req_rdy;
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io.cpu.req_rdy := io.mem.req_rdy && !io.ptw.req_val;
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io.cpu.resp_miss := io.mem.resp_miss && !io.mem.resp_tag(0).toBool;
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val io = new ioDmemArbiter(n)
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require(DCACHE_TAG_BITS >= log2up(n) + CPU_TAG_BITS)
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io.cpu.resp_nack := io.mem.resp_nack && !r_ptw_req_val
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io.ptw.resp_nack := io.mem.resp_nack && r_ptw_req_val
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var req_val = Bool(false)
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var req_rdy = io.dmem.req_rdy
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for (i <- 0 until n)
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{
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io.requestor(i).req_rdy := req_rdy
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req_val = req_val || io.requestor(i).req_val
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req_rdy = req_rdy && !io.requestor(i).req_val
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}
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io.cpu.resp_val := io.mem.resp_val && !io.mem.resp_tag(0).toBool;
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io.ptw.resp_val := io.mem.resp_val && io.mem.resp_tag(0).toBool;
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var req_cmd = io.requestor(n-1).req_cmd
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var req_type = io.requestor(n-1).req_type
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var req_idx = io.requestor(n-1).req_idx
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var req_ppn = io.requestor(n-1).req_ppn
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var req_data = io.requestor(n-1).req_data
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var req_tag = io.requestor(n-1).req_tag
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var req_kill = io.requestor(n-1).req_kill
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for (i <- n-1 to 0 by -1)
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{
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req_cmd = Mux(io.requestor(i).req_val, io.requestor(i).req_cmd, req_cmd)
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req_type = Mux(io.requestor(i).req_val, io.requestor(i).req_type, req_type)
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req_idx = Mux(io.requestor(i).req_val, io.requestor(i).req_idx, req_idx)
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req_ppn = Mux(Reg(io.requestor(i).req_val), io.requestor(i).req_ppn, req_ppn)
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req_data = Mux(Reg(io.requestor(i).req_val), io.requestor(i).req_data, req_data)
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req_tag = Mux(io.requestor(i).req_val, Cat(io.requestor(i).req_tag, UFix(i, log2up(n))), req_tag)
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req_kill = Mux(Reg(io.requestor(i).req_val), io.requestor(i).req_kill, req_kill)
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}
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io.cpu.resp_replay := io.mem.resp_replay && !io.mem.resp_tag(0).toBool;
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io.ptw.resp_replay := io.mem.resp_replay && io.mem.resp_tag(0).toBool;
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io.dmem.req_val := req_val
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io.dmem.req_cmd := req_cmd
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io.dmem.req_type := req_type
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io.dmem.req_idx := req_idx
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io.dmem.req_ppn := req_ppn
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io.dmem.req_data := req_data
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io.dmem.req_tag := req_tag
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io.dmem.req_kill := req_kill
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io.ptw.resp_data := io.mem.resp_data;
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io.cpu.resp_data := io.mem.resp_data;
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io.cpu.resp_tag := io.mem.resp_tag >> UFix(1);
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for (i <- 0 until n)
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{
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val tag_hit = io.dmem.resp_tag(log2up(n)-1,0) === UFix(i)
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io.requestor(i).resp_miss := io.dmem.resp_miss && tag_hit
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io.requestor(i).resp_nack := io.dmem.resp_nack && Reg(io.requestor(i).req_val)
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io.requestor(i).resp_val := io.dmem.resp_val && tag_hit
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io.requestor(i).resp_replay := io.dmem.resp_replay && tag_hit
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io.requestor(i).resp_data := io.dmem.resp_data
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io.requestor(i).resp_tag := io.dmem.resp_tag >> UFix(log2up(n))
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}
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}
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class ioPTW extends Bundle
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@ -102,9 +118,9 @@ class rocketPTW extends Component
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io.dmem.req_cmd := M_XRD;
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io.dmem.req_type := MT_D;
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// io.dmem.req_addr := req_addr;
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io.dmem.req_idx := req_addr(PGIDX_BITS-1,0);
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io.dmem.req_ppn := req_addr(PADDR_BITS-1,PGIDX_BITS);
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io.dmem.req_ppn := Reg(req_addr(PADDR_BITS-1,PGIDX_BITS))
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io.dmem.req_kill := Bool(false)
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val resp_val = (state === s_done) || (state === s_l1_fake) || (state === s_l2_fake);
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val resp_err = (state === s_error);
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