split into two caches, compiles
This commit is contained in:
Henry Cook
parent
29ed8eb31a
commit
8623d58724
@ -188,6 +188,7 @@ object Constants
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val NSDQ = 17; // number of secondary stores/AMOs
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val LG_REFILL_WIDTH = 4; // log2(cache bus width in bytes)
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val IDX_BITS = PGIDX_BITS - OFFSET_BITS;
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val NWAYS = 1;
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// external memory interface
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val IMEM_TAG_BITS = 1;
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@ -5,18 +5,19 @@ import Node._;
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import Constants._;
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import scala.math._;
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class ReplacementWayGen (width: Int, ways: Int) extends Component {
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class ReplacementWayGen extends Component {
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val io = new Bundle {
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val ways_en = Bits(width = width, dir = INPUT)
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val way_id = UFix(width = log2up(ways), dir = OUTPUT)
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val way_en = Bits(width = width, dir = INPUT)
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val way_id = UFix(width = log2up(NWAYS), dir = OUTPUT)
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}
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}
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class RandomReplacementWayGen (width: Int, ways: Int) extends ReplacementWayGen(width, ways) {
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val lfsr = Reg(resetVal = UFix(1, width))
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when (io.ways_en.orR) { lfsr <== Cat(lfsr(0)^lfsr(2)^lfsr(3)^lfsr(5), lfsr(width-1,1)) }
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class RandomReplacementWayGen extends ReplacementWayGen() {
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val width = max(6,log2up(NWAYS))
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val lfsr = Reg(resetVal = UFix(1, width))
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when (io.way_en.orR) { lfsr <== Cat(lfsr(0)^lfsr(2)^lfsr(3)^lfsr(5), lfsr(width-1,1)) }
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//TODO: Actually limit selection based on which ways are available (io.ways_en)
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io.way_id := lfsr(log2up(ways)-1,0).toUFix
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io.way_id := lfsr(log2up(NWAYS)-1,0).toUFix
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}
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class StoreMaskGen extends Component {
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@ -106,6 +107,7 @@ class Replay extends Bundle {
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val typ = Bits(width = 3)
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val sdq_id = UFix(width = log2up(NSDQ))
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val tag = Bits(width = DCACHE_TAG_BITS)
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val way_id = UFix(width = log2up(NWAYS))
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}
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class DataReq extends Bundle {
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@ -124,6 +126,11 @@ class DataArrayReq extends Bundle {
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val data = Bits(width = MEM_DATA_BITS)
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}
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class DataArrayArrayReq extends Bundle {
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val inner_req = new DataArrayReq()
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val way_en = Bits(width = NWAYS)
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}
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class MemReq extends Bundle {
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val rw = Bool()
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val addr = UFix(width = PPN_BITS+IDX_BITS)
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@ -133,6 +140,7 @@ class MemReq extends Bundle {
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class WritebackReq extends Bundle {
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val ppn = Bits(width = PPN_BITS)
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val idx = Bits(width = IDX_BITS)
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val way_id = UFix(width = log2up(NWAYS))
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}
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class MetaData extends Bundle {
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@ -147,6 +155,11 @@ class MetaArrayReq extends Bundle {
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val data = new MetaData()
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}
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class MetaArrayArrayReq extends Bundle {
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val inner_req = new MetaArrayReq()
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val way_en = Bits(width = NWAYS)
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}
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class MSHR(id: Int) extends Component {
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val io = new Bundle {
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val req_pri_val = Bool(INPUT)
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@ -160,14 +173,16 @@ class MSHR(id: Int) extends Component {
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val req_type = Bits(3, INPUT)
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val req_sdq_id = UFix(log2up(NSDQ), INPUT)
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val req_tag = Bits(DCACHE_TAG_BITS, INPUT)
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val req_way_id = UFix(log2up(NWAYS),INPUT)
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val idx_match = Bool(OUTPUT)
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val idx = Bits(IDX_BITS, OUTPUT)
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val tag = Bits(PPN_BITS, OUTPUT)
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val way_id = Bits(log2up(NWAYS), OUTPUT)
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val mem_resp_val = Bool(INPUT)
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val mem_req = (new ioDecoupled) { new MemReq() }.flip
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val meta_req = (new ioDecoupled) { new MetaArrayReq() }.flip
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val meta_req = (new ioDecoupled) { new MetaArrayArrayReq() }.flip
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val replay = (new ioDecoupled) { new Replay() }.flip
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}
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@ -177,6 +192,7 @@ class MSHR(id: Int) extends Component {
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val refilled = Reg { Bool() }
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val ppn = Reg { Bits() }
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val idx_ = Reg { Bits() }
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val way_id_ = Reg { Bits() }
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val req_load = (io.req_cmd === M_XRD) || (io.req_cmd === M_PFR)
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val req_use_rpq = (io.req_cmd != M_PFR) && (io.req_cmd != M_PFW)
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@ -200,6 +216,7 @@ class MSHR(id: Int) extends Component {
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refilled <== Bool(false)
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ppn <== io.req_ppn
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idx_ <== io.req_idx
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way_id_ <== io.req_way_id
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}
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when (io.mem_req.valid && io.mem_req.ready) {
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requested <== Bool(true)
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@ -215,15 +232,17 @@ class MSHR(id: Int) extends Component {
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io.idx_match := valid && (idx_ === io.req_idx)
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io.idx := idx_
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io.tag := ppn
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io.way_id := way_id_
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io.req_pri_rdy := !valid
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io.req_sec_rdy := sec_rdy && rpq.io.enq.ready
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io.meta_req.valid := valid && refilled && !rpq.io.deq.valid
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io.meta_req.bits.rw := Bool(true)
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io.meta_req.bits.idx := idx_
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io.meta_req.bits.data.valid := Bool(true)
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io.meta_req.bits.data.dirty := dirty
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io.meta_req.bits.data.tag := ppn
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io.meta_req.bits.inner_req.rw := Bool(true)
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io.meta_req.bits.inner_req.idx := idx_
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io.meta_req.bits.inner_req.data.valid := Bool(true)
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io.meta_req.bits.inner_req.data.dirty := dirty
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io.meta_req.bits.inner_req.data.tag := ppn
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io.meta_req.bits.way_en := UFixToOH(way_id_.toUFix, NWAYS)
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io.mem_req.valid := valid && !requested
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//io.mem_req.bits.itm := next_dirty
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@ -238,6 +257,7 @@ class MSHR(id: Int) extends Component {
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io.replay.bits.cmd := rpq.io.deq.bits.cmd
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io.replay.bits.typ := rpq.io.deq.bits.typ
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io.replay.bits.sdq_id := rpq.io.deq.bits.sdq_id
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io.replay.bits.way_id := way_id_.toUFix
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}
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class MSHRFile extends Component {
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@ -251,21 +271,24 @@ class MSHRFile extends Component {
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val req_type = Bits(3, INPUT)
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val req_tag = Bits(DCACHE_TAG_BITS, INPUT)
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val req_sdq_id = UFix(log2up(NSDQ), INPUT)
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val req_way_id = UFix(log2up(NWAYS), INPUT)
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val mem_resp_val = Bool(INPUT)
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val mem_resp_tag = Bits(DMEM_TAG_BITS, INPUT)
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val mem_resp_idx = Bits(IDX_BITS, OUTPUT)
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val mem_resp_way_id = UFix(log2up(NWAYS), OUTPUT)
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val fence_rdy = Bool(OUTPUT)
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val mem_req = (new ioDecoupled) { new MemReq() }.flip()
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val meta_req = (new ioDecoupled) { new MetaArrayReq() }.flip()
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val meta_req = (new ioDecoupled) { new MetaArrayArrayReq() }.flip()
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val replay = (new ioDecoupled) { new Replay() }.flip()
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}
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val tag_mux = new Mux1H(NMSHR, PPN_BITS)
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val mem_resp_idx_mux = new Mux1H(NMSHR, IDX_BITS)
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val meta_req_arb = (new Arbiter(NMSHR)) { new MetaArrayReq() }
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val mem_resp_way_id_mux = new Mux1H(NMSHR, log2up(NWAYS))
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val meta_req_arb = (new Arbiter(NMSHR)) { new MetaArrayArrayReq() }
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val mem_req_arb = (new Arbiter(NMSHR)) { new MemReq() }
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val replay_arb = (new Arbiter(NMSHR)) { new Replay() }
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@ -295,6 +318,7 @@ class MSHRFile extends Component {
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mshr.io.req_cmd := io.req_cmd
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mshr.io.req_type := io.req_type
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mshr.io.req_sdq_id := io.req_sdq_id
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mshr.io.req_way_id := io.req_way_id
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mshr.io.meta_req <> meta_req_arb.io.in(i)
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mshr.io.mem_req <> mem_req_arb.io.in(i)
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@ -304,6 +328,8 @@ class MSHRFile extends Component {
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mshr.io.mem_resp_val := mem_resp_val
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mem_resp_idx_mux.io.sel(i) := (UFix(i) === io.mem_resp_tag)
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mem_resp_idx_mux.io.in(i) := mshr.io.idx
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mem_resp_way_id_mux.io.sel(i) := (UFix(i) === io.mem_resp_tag)
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mem_resp_way_id_mux.io.in(i) := mshr.io.way_id
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pri_rdy = pri_rdy || mshr.io.req_pri_rdy
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sec_rdy = sec_rdy || mshr.io.req_sec_rdy
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@ -319,6 +345,7 @@ class MSHRFile extends Component {
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io.req_rdy := Mux(idx_match, tag_match && sec_rdy, pri_rdy)
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io.mem_resp_idx := mem_resp_idx_mux.io.out
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io.mem_resp_way_id := mem_resp_way_id_mux.io.out.toUFix
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io.fence_rdy := !fence
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}
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@ -326,6 +353,7 @@ class ReplayUnit extends Component {
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val io = new Bundle {
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val sdq_enq = (new ioDecoupled) { Bits(width = CPU_DATA_BITS) }
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val sdq_id = UFix(log2up(NSDQ), OUTPUT)
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val way_id = UFix(log2up(NWAYS), OUTPUT)
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val replay = (new ioDecoupled) { new Replay() }
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val data_req = (new ioDecoupled) { new DataReq() }.flip()
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val cpu_resp_val = Bool(OUTPUT)
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@ -370,6 +398,7 @@ class ReplayUnit extends Component {
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io.replay.ready := !replay_retry
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io.data_req.valid := replay_val
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io.way_id := rp.way_id
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io.data_req.bits.idx := rp.idx
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io.data_req.bits.offset := rp.offset
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io.data_req.bits.cmd := rp.cmd
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@ -383,7 +412,7 @@ class ReplayUnit extends Component {
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class WritebackUnit extends Component {
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val io = new Bundle {
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val req = (new ioDecoupled) { new WritebackReq() }
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val data_req = (new ioDecoupled) { new DataArrayReq() }.flip()
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val data_req = (new ioDecoupled) { new DataArrayArrayReq() }.flip()
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val data_resp = Bits(MEM_DATA_BITS, INPUT)
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val refill_req = (new ioDecoupled) { new MemReq() }
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val mem_req = (new ioDecoupled) { new MemReq() }.flip()
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@ -412,11 +441,12 @@ class WritebackUnit extends Component {
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io.req.ready := !valid
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io.data_req.valid := valid && (cnt < UFix(REFILL_CYCLES))
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io.data_req.bits.idx := addr.idx
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io.data_req.bits.offset := cnt
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io.data_req.bits.rw := Bool(false)
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io.data_req.bits.wmask := Bits(0)
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io.data_req.bits.data := Bits(0)
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io.data_req.bits.way_en := UFixToOH(addr.way_id, NWAYS)
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io.data_req.bits.inner_req.idx := addr.idx
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io.data_req.bits.inner_req.offset := cnt
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io.data_req.bits.inner_req.rw := Bool(false)
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io.data_req.bits.inner_req.wmask := Bits(0)
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io.data_req.bits.inner_req.data := Bits(0)
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io.refill_req.ready := io.mem_req.ready && !block_refill
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io.mem_req.valid := refill_val || wbq.io.deq.valid && (cnt === UFix(REFILL_CYCLES))
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@ -430,7 +460,7 @@ class FlushUnit(lines: Int) extends Component {
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val io = new Bundle {
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val req = (new ioDecoupled) { Bits(width = DCACHE_TAG_BITS) }
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val resp = (new ioDecoupled) { Bits(width = DCACHE_TAG_BITS) }.flip()
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val meta_req = (new ioDecoupled) { new MetaArrayReq() }.flip()
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val meta_req = (new ioDecoupled) { new MetaArrayArrayReq() }.flip()
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val meta_resp = (new MetaData).asInput()
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val wb_req = (new ioDecoupled) { new WritebackReq() }.flip()
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}
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@ -438,15 +468,23 @@ class FlushUnit(lines: Int) extends Component {
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val s_reset :: s_ready :: s_meta_read :: s_meta_wait :: s_meta_write :: s_done :: Nil = Enum(6) { UFix() }
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val state = Reg(resetVal = s_reset)
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val tag = Reg() { Bits() }
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val cnt = Reg(resetVal = UFix(0, log2up(lines)))
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val next_cnt = cnt + UFix(1)
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val idx_cnt = Reg(resetVal = UFix(0, log2up(lines)))
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val next_idx_cnt = idx_cnt + UFix(1)
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val way_cnt = Reg(resetVal = UFix(0, log2up(NWAYS)))
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val next_way_cnt = way_cnt + UFix(1)
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switch (state) {
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is(s_reset) { when (io.meta_req.ready) { state <== Mux(~cnt === UFix(0), s_ready, s_reset); cnt <== next_cnt } }
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is(s_reset) {
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when (io.meta_req.ready) {
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state <== Mux(~way_cnt === UFix(0) && ~idx_cnt === UFix(0), s_ready, s_reset);
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when (~way_cnt === UFix(0)) { idx_cnt <== next_idx_cnt };
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way_cnt <== next_way_cnt;
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}
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}
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is(s_ready) { when (io.req.valid) { state <== s_meta_read; tag <== io.req.bits } }
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is(s_meta_read) { when (io.meta_req.ready) { state <== s_meta_wait } }
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is(s_meta_wait) { state <== Mux(io.meta_resp.valid && io.meta_resp.dirty && !io.wb_req.ready, s_meta_read, s_meta_write) }
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is(s_meta_write) { when (io.meta_req.ready) { state <== Mux(~cnt === UFix(0), s_done, s_meta_read); cnt <== next_cnt } }
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is(s_meta_write) { when (io.meta_req.ready) { state <== Mux(~idx_cnt === UFix(0), s_done, s_meta_read); idx_cnt <== next_idx_cnt } }
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is(s_done) { when (io.resp.ready) { state <== s_ready } }
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}
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@ -454,21 +492,48 @@ class FlushUnit(lines: Int) extends Component {
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io.resp.valid := state === s_done
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io.resp.bits := tag
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io.meta_req.valid := (state === s_meta_read) || (state === s_meta_write) || (state === s_reset)
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io.meta_req.bits.idx := cnt
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io.meta_req.bits.rw := (state === s_meta_write) || (state === s_reset)
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io.meta_req.bits.data.valid := Bool(false)
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io.meta_req.bits.data.dirty := Bool(false)
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io.meta_req.bits.data.tag := UFix(0)
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io.meta_req.bits.way_en := UFixToOH(way_cnt, NWAYS)
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io.meta_req.bits.inner_req.idx := idx_cnt
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io.meta_req.bits.inner_req.rw := (state === s_meta_write) || (state === s_reset)
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io.meta_req.bits.inner_req.data.valid := Bool(false)
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io.meta_req.bits.inner_req.data.dirty := Bool(false)
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io.meta_req.bits.inner_req.data.tag := UFix(0)
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io.wb_req.valid := state === s_meta_wait
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io.wb_req.bits.ppn := io.meta_resp.tag
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io.wb_req.bits.idx := cnt
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io.wb_req.bits.idx := idx_cnt
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io.wb_req.bits.way_id := way_cnt
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}
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class MetaDataArrayArray(lines: Int) extends Component {
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val io = new Bundle {
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val req = (new ioDecoupled) { new MetaArrayArrayReq() }
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val resp = Vec(NWAYS){ (new MetaData).asOutput }
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val state_req = (new ioDecoupled) { new MetaArrayArrayReq() }
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}
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val way_arr = List.fill(NWAYS){ new MetaDataArray(lines) }
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val tag_ready_arr = Bits(width = NWAYS)
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val state_ready_arr = Bits(width = NWAYS)
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for(w <- 0 until NWAYS) {
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way_arr(w).io.req.bits ^^ io.req.bits.inner_req
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way_arr(w).io.req.ready := tag_ready_arr(w)
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way_arr(w).io.req.valid := io.req.valid && io.req.bits.way_en(w).toBool
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way_arr(w).io.state_req.bits ^^ io.req.bits.inner_req
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way_arr(w).io.state_req.ready := state_ready_arr(w)
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way_arr(w).io.state_req.valid := io.req.valid && io.req.bits.way_en(w).toBool
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io.resp(w) ^^ way_arr(w).io.resp
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}
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io.req.ready := tag_ready_arr.andR.toBool
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io.state_req.ready := state_ready_arr.andR.toBool
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}
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class MetaDataArray(lines: Int) extends Component {
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val io = new Bundle {
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val req = (new ioDecoupled) { new MetaArrayReq() }
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val resp = (new MetaData).asOutput()
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val state_req = (new ioDecoupled) { new MetaArrayReq() }
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}
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@ -494,6 +559,32 @@ class MetaDataArray(lines: Int) extends Component {
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io.req.ready := !vd_conflict
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}
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class DataArrayArray(lines: Int) extends Component {
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val io = new Bundle {
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val req = (new ioDecoupled) { new DataArrayArrayReq() }
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val resp = Vec(NWAYS){ Bits(width = MEM_DATA_BITS, dir = OUTPUT) }
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val way_en = Bits(width = NWAYS, dir = OUTPUT)
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}
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val way_en_ = Reg { Bits() }
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when (io.req.valid && io.req.ready) {
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way_en_ <== io.req.bits.way_en
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}
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val way_arr = List.fill(NWAYS){ new DataArray(lines) }
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val data_ready_arr = Bits(width = NWAYS)
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for(w <- 0 until NWAYS) {
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way_arr(w).io.req.bits ^^ io.req.bits.inner_req
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way_arr(w).io.req.ready := data_ready_arr(w)
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way_arr(w).io.req.valid := io.req.valid && io.req.bits.way_en(w).toBool
|
||||
io.resp(w) ^^ way_arr(w).io.resp
|
||||
}
|
||||
|
||||
io.way_en := way_en_
|
||||
io.req.ready := data_ready_arr.andR.toBool
|
||||
}
|
||||
|
||||
class DataArray(lines: Int) extends Component {
|
||||
val io = new Bundle {
|
||||
val req = (new ioDecoupled) { new DataArrayReq() }
|
||||
@ -540,20 +631,24 @@ class AMOALU extends Component {
|
||||
/* MIN[U]/MAX[U] */ cmp_out))));
|
||||
}
|
||||
|
||||
class HellaCache(lines: Int) extends Component {
|
||||
val io = new ioDCacheHella();
|
||||
//class HellaCache(lines: Int, ways: Int) extends Component {
|
||||
//
|
||||
//}
|
||||
|
||||
class HellaCacheDM(lines: Int) extends Component {
|
||||
val io = new ioDCacheHella()
|
||||
|
||||
val addrbits = PADDR_BITS;
|
||||
val indexbits = log2up(lines);
|
||||
val offsetbits = OFFSET_BITS;
|
||||
val tagmsb = PADDR_BITS-1;
|
||||
val taglsb = indexbits+offsetbits;
|
||||
val tagbits = tagmsb-taglsb+1;
|
||||
val indexmsb = taglsb-1;
|
||||
val indexlsb = offsetbits;
|
||||
val offsetmsb = indexlsb-1;
|
||||
val offsetlsb = log2up(CPU_DATA_BITS/8);
|
||||
val ramindexlsb = log2up(MEM_DATA_BITS/8);
|
||||
val addrbits = PADDR_BITS
|
||||
val indexbits = log2up(lines)
|
||||
val offsetbits = OFFSET_BITS
|
||||
val tagmsb = PADDR_BITS-1
|
||||
val taglsb = indexbits+offsetbits
|
||||
val tagbits = tagmsb-taglsb+1
|
||||
val indexmsb = taglsb-1
|
||||
val indexlsb = offsetbits
|
||||
val offsetmsb = indexlsb-1
|
||||
val offsetlsb = log2up(CPU_DATA_BITS/8)
|
||||
val ramindexlsb = log2up(MEM_DATA_BITS/8)
|
||||
|
||||
val early_nack = Reg { Bool() }
|
||||
val r_cpu_req_val_ = Reg(io.cpu.req_val && io.cpu.req_rdy, resetVal = Bool(false))
|
||||
@ -569,6 +664,7 @@ class HellaCache(lines: Int) extends Component {
|
||||
val p_store_idx = Reg() { Bits() }
|
||||
val p_store_cmd = Reg() { Bits() }
|
||||
val p_store_type = Reg() { Bits() }
|
||||
val p_store_way_id = Reg() { Bits() }
|
||||
val r_replay_amo = Reg(resetVal = Bool(false))
|
||||
|
||||
val req_store = (io.cpu.req_cmd === M_XWR)
|
||||
@ -586,7 +682,7 @@ class HellaCache(lines: Int) extends Component {
|
||||
val r_req_readwrite = r_req_read || r_req_write
|
||||
|
||||
// replay unit
|
||||
val replayer = new ReplayUnit
|
||||
val replayer = new ReplayUnit()
|
||||
val replay_amo_val = replayer.io.data_req.valid && replayer.io.data_req.bits.cmd(3).toBool
|
||||
|
||||
when (replay_amo_val) {
|
||||
@ -615,9 +711,6 @@ class HellaCache(lines: Int) extends Component {
|
||||
io.cpu.xcpt_ma_ld := r_cpu_req_val_ && r_req_read && misaligned
|
||||
io.cpu.xcpt_ma_st := r_cpu_req_val_ && r_req_write && misaligned
|
||||
|
||||
}
|
||||
|
||||
class HellaCacheDM(lines: Int) extends HellaCache(lines) {
|
||||
// tags
|
||||
val meta = new MetaDataArray(lines)
|
||||
val meta_arb = (new Arbiter(3)) { new MetaArrayReq() }
|
||||
@ -632,7 +725,10 @@ class HellaCacheDM(lines: Int) extends HellaCache(lines) {
|
||||
val wb = new WritebackUnit
|
||||
val wb_arb = (new Arbiter(2)) { new WritebackReq() }
|
||||
wb_arb.io.out <> wb.io.req
|
||||
wb.io.data_req <> data_arb.io.in(3)
|
||||
wb.io.data_req.bits.inner_req <> data_arb.io.in(3).bits
|
||||
wb.io.data_req.ready <> data_arb.io.in(3).ready
|
||||
wb.io.data_req.valid <> data_arb.io.in(3).valid
|
||||
|
||||
wb.io.data_resp <> data.io.resp
|
||||
|
||||
// cpu tag check
|
||||
@ -713,7 +809,7 @@ class HellaCacheDM(lines: Int) extends HellaCache(lines) {
|
||||
}
|
||||
|
||||
// miss handling
|
||||
val mshr = new MSHRFile
|
||||
val mshr = new MSHRFile()
|
||||
mshr.io.req_val := tag_miss && r_req_readwrite && (!dirty || wb_rdy) && (!r_req_write || replayer.io.sdq_enq.ready)
|
||||
mshr.io.req_ppn := io.cpu.req_ppn
|
||||
mshr.io.req_idx := r_cpu_req_idx(indexmsb,indexlsb)
|
||||
@ -810,4 +906,292 @@ class HellaCacheDM(lines: Int) extends HellaCache(lines) {
|
||||
io.mem.req_addr := wb.io.mem_req.bits.addr
|
||||
}
|
||||
|
||||
class HellaCacheAssoc(lines: Int) extends Component {
|
||||
val io = new ioDCacheHella()
|
||||
|
||||
val addrbits = PADDR_BITS
|
||||
val indexbits = log2up(lines)
|
||||
val offsetbits = OFFSET_BITS
|
||||
val tagmsb = PADDR_BITS-1
|
||||
val taglsb = indexbits+offsetbits
|
||||
val tagbits = tagmsb-taglsb+1
|
||||
val indexmsb = taglsb-1
|
||||
val indexlsb = offsetbits
|
||||
val offsetmsb = indexlsb-1
|
||||
val offsetlsb = log2up(CPU_DATA_BITS/8)
|
||||
val ramindexlsb = log2up(MEM_DATA_BITS/8)
|
||||
|
||||
val early_nack = Reg { Bool() }
|
||||
val r_cpu_req_val_ = Reg(io.cpu.req_val && io.cpu.req_rdy, resetVal = Bool(false))
|
||||
val r_cpu_req_val = r_cpu_req_val_ && !io.cpu.req_kill && !early_nack
|
||||
val r_cpu_req_idx = Reg() { Bits() }
|
||||
val r_cpu_req_cmd = Reg() { Bits() }
|
||||
val r_cpu_req_type = Reg() { Bits() }
|
||||
val r_cpu_req_tag = Reg() { Bits() }
|
||||
val r_cpu_req_data = Reg() { Bits() }
|
||||
|
||||
val p_store_valid = Reg(resetVal = Bool(false))
|
||||
val p_store_data = Reg() { Bits() }
|
||||
val p_store_idx = Reg() { Bits() }
|
||||
val p_store_cmd = Reg() { Bits() }
|
||||
val p_store_type = Reg() { Bits() }
|
||||
val p_store_way_id = Reg() { Bits() }
|
||||
val r_replay_amo = Reg(resetVal = Bool(false))
|
||||
|
||||
val req_store = (io.cpu.req_cmd === M_XWR)
|
||||
val req_load = (io.cpu.req_cmd === M_XRD)
|
||||
val req_amo = io.cpu.req_cmd(3).toBool
|
||||
val req_read = req_load || req_amo
|
||||
val req_write = req_store || req_amo
|
||||
val r_req_load = (r_cpu_req_cmd === M_XRD)
|
||||
val r_req_store = (r_cpu_req_cmd === M_XWR)
|
||||
val r_req_flush = (r_cpu_req_cmd === M_FLA)
|
||||
val r_req_fence = (r_cpu_req_cmd === M_FENCE)
|
||||
val r_req_amo = r_cpu_req_cmd(3).toBool
|
||||
val r_req_read = r_req_load || r_req_amo
|
||||
val r_req_write = r_req_store || r_req_amo
|
||||
val r_req_readwrite = r_req_read || r_req_write
|
||||
|
||||
// replay unit
|
||||
val replayer = new ReplayUnit()
|
||||
val replay_amo_val = replayer.io.data_req.valid && replayer.io.data_req.bits.cmd(3).toBool
|
||||
|
||||
when (replay_amo_val) {
|
||||
r_cpu_req_data <== replayer.io.data_req.bits.data
|
||||
}
|
||||
when (io.cpu.req_val) {
|
||||
r_cpu_req_idx <== io.cpu.req_idx
|
||||
r_cpu_req_cmd <== io.cpu.req_cmd
|
||||
r_cpu_req_type <== io.cpu.req_type
|
||||
r_cpu_req_tag <== io.cpu.req_tag
|
||||
when (req_write) {
|
||||
r_cpu_req_data <== io.cpu.req_data
|
||||
}
|
||||
}
|
||||
|
||||
// refill counter
|
||||
val rr_count = Reg(resetVal = UFix(0, log2up(REFILL_CYCLES)))
|
||||
val rr_count_next = rr_count + UFix(1)
|
||||
when (io.mem.resp_val) { rr_count <== rr_count_next }
|
||||
|
||||
val misaligned =
|
||||
(((r_cpu_req_type === MT_H) || (r_cpu_req_type === MT_HU)) && (r_cpu_req_idx(0) != Bits(0))) ||
|
||||
(((r_cpu_req_type === MT_W) || (r_cpu_req_type === MT_WU)) && (r_cpu_req_idx(1,0) != Bits(0))) ||
|
||||
((r_cpu_req_type === MT_D) && (r_cpu_req_idx(2,0) != Bits(0)));
|
||||
|
||||
io.cpu.xcpt_ma_ld := r_cpu_req_val_ && r_req_read && misaligned
|
||||
io.cpu.xcpt_ma_st := r_cpu_req_val_ && r_req_write && misaligned
|
||||
// tags
|
||||
val meta = new MetaDataArrayArray(lines)
|
||||
val meta_arb = (new Arbiter(3)) { new MetaArrayArrayReq() }
|
||||
meta_arb.io.out <> meta.io.req
|
||||
|
||||
// data
|
||||
val data = new DataArrayArray(lines)
|
||||
val data_arb = (new Arbiter(5)) { new DataArrayArrayReq() }
|
||||
data_arb.io.out <> data.io.req
|
||||
|
||||
// cpu tag check
|
||||
meta_arb.io.in(2).valid := io.cpu.req_val
|
||||
meta_arb.io.in(2).bits.inner_req.idx := io.cpu.req_idx(indexmsb,indexlsb)
|
||||
meta_arb.io.in(2).bits.inner_req.rw := Bool(false)
|
||||
meta_arb.io.in(2).bits.inner_req.data.valid := Bool(false) // don't care
|
||||
meta_arb.io.in(2).bits.inner_req.data.dirty := Bool(false) // don't care
|
||||
meta_arb.io.in(2).bits.inner_req.data.tag := UFix(0) // don't care
|
||||
meta_arb.io.in(2).bits.way_en := ~UFix(0, NWAYS)
|
||||
val early_tag_nack = !meta_arb.io.in(2).ready
|
||||
//val tag_match_arr = meta.io.resp.map(r => r.valid && (r.tag === io.cpu_req_ppn))
|
||||
val tag_match_arr = (0 until NWAYS).map( w => meta.io.resp(w).valid && (meta.io.resp(w).tag === io.cpu.req_ppn))
|
||||
val tag_match = Cat(Bits(0),tag_match_arr:_*).orR
|
||||
val tag_hit = r_cpu_req_val && tag_match
|
||||
val tag_miss = r_cpu_req_val && !tag_match
|
||||
val hit_way_id = OHToUFix(Cat(Bits(0),tag_match_arr:_*))
|
||||
val meta_hit_mux = meta.io.resp(hit_way_id)
|
||||
|
||||
// writeback unit
|
||||
val wb = new WritebackUnit
|
||||
val wb_arb = (new Arbiter(2)) { new WritebackReq() }
|
||||
wb_arb.io.out <> wb.io.req
|
||||
wb.io.data_req <> data_arb.io.in(3)
|
||||
val data_resp_way_id = Mux(data.io.way_en === ~UFix(0, NWAYS), hit_way_id, OHToUFix(data.io.way_en))
|
||||
val data_resp_mux = data.io.resp(data_resp_way_id)
|
||||
wb.io.data_resp <> data_resp_mux
|
||||
|
||||
// replacement policy
|
||||
val replacer = new RandomReplacementWayGen()
|
||||
replacer.io.way_en := tag_miss & ~UFix(0, NWAYS)
|
||||
val replaced_way_id = replacer.io.way_id
|
||||
val meta_wb_mux = meta.io.resp(replaced_way_id)
|
||||
val dirty = meta_wb_mux.valid && meta_wb_mux.dirty //TODO: check all dirty uses
|
||||
|
||||
// refill response
|
||||
val block_during_refill = !io.mem.resp_val && (rr_count != UFix(0))
|
||||
data_arb.io.in(0).bits.inner_req.offset := rr_count
|
||||
data_arb.io.in(0).bits.inner_req.rw := !block_during_refill
|
||||
data_arb.io.in(0).bits.inner_req.wmask := ~UFix(0, MEM_DATA_BITS/8)
|
||||
data_arb.io.in(0).bits.inner_req.data := io.mem.resp_data
|
||||
data_arb.io.in(0).valid := io.mem.resp_val || block_during_refill
|
||||
|
||||
// load hits
|
||||
data_arb.io.in(4).bits.inner_req.offset := io.cpu.req_idx(offsetmsb,ramindexlsb)
|
||||
data_arb.io.in(4).bits.inner_req.idx := io.cpu.req_idx(indexmsb,indexlsb)
|
||||
data_arb.io.in(4).bits.inner_req.rw := Bool(false)
|
||||
data_arb.io.in(4).bits.inner_req.wmask := UFix(0) // don't care
|
||||
data_arb.io.in(4).bits.inner_req.data := io.mem.resp_data // don't care
|
||||
data_arb.io.in(4).valid := io.cpu.req_val && req_read
|
||||
data_arb.io.in(4).bits.way_en := ~UFix(0, NWAYS) // intiate load on all ways, mux after tag check
|
||||
val early_load_nack = req_read && !data_arb.io.in(4).ready
|
||||
|
||||
// store hits and AMO hits and misses use a pending store register.
|
||||
// we nack new stores if a pending store can't retire for some reason.
|
||||
// we drain a pending store if the CPU performs a store or a
|
||||
// conflictig load, or if the cache is idle, or after a miss.
|
||||
val p_store_idx_match = p_store_valid && (r_cpu_req_idx(indexmsb,indexlsb) === p_store_idx(indexmsb,indexlsb))
|
||||
val p_store_offset_match = (r_cpu_req_idx(indexlsb-1,offsetlsb) === p_store_idx(indexlsb-1,offsetlsb))
|
||||
val p_store_match = r_cpu_req_val && r_req_read && p_store_idx_match && p_store_offset_match
|
||||
val drain_store_val = (p_store_valid && (!io.cpu.req_val || !req_read || Reg(tag_miss))) || p_store_match
|
||||
data_arb.io.in(2).bits.inner_req.offset := p_store_idx(offsetmsb,ramindexlsb)
|
||||
data_arb.io.in(2).bits.inner_req.idx := p_store_idx(indexmsb,indexlsb)
|
||||
data_arb.io.in(2).bits.inner_req.rw := Bool(true)
|
||||
data_arb.io.in(2).valid := drain_store_val
|
||||
data_arb.io.in(2).bits.way_en := UFixToOH(p_store_way_id.toUFix, NWAYS)
|
||||
val drain_store = drain_store_val && data_arb.io.in(2).ready
|
||||
val p_store_rdy = !p_store_valid || drain_store
|
||||
val p_amo = Reg(tag_hit && r_req_amo && p_store_rdy && !p_store_match || r_replay_amo, resetVal = Bool(false))
|
||||
p_store_valid <== !p_store_rdy || (tag_hit && r_req_store) || p_amo
|
||||
|
||||
// writeback
|
||||
val wb_rdy = wb_arb.io.in(1).ready && !p_store_idx_match
|
||||
wb_arb.io.in(1).valid := tag_miss && r_req_readwrite && dirty && !p_store_idx_match
|
||||
wb_arb.io.in(1).bits.ppn := meta_wb_mux.tag
|
||||
wb_arb.io.in(1).bits.idx := r_cpu_req_idx(indexmsb,indexlsb)
|
||||
wb_arb.io.in(1).bits.way_id := replaced_way_id
|
||||
|
||||
// tag update after a miss or a store to an exclusive clean line.
|
||||
val clear_valid = tag_miss && r_req_readwrite && meta_hit_mux.valid && (!dirty || wb_rdy)
|
||||
val set_dirty = tag_hit && !meta_hit_mux.dirty && r_req_write
|
||||
meta.io.state_req.bits.inner_req.rw := Bool(true)
|
||||
meta.io.state_req.bits.inner_req.idx := r_cpu_req_idx(indexmsb,indexlsb)
|
||||
meta.io.state_req.bits.inner_req.data.valid := tag_match
|
||||
meta.io.state_req.bits.inner_req.data.dirty := tag_match
|
||||
meta.io.state_req.valid := clear_valid || set_dirty
|
||||
meta.io.state_req.bits.way_en := Cat(Bits(0),tag_match_arr:_*)
|
||||
|
||||
// pending store data, also used for AMO RHS
|
||||
val storegen = new StoreDataGen
|
||||
val amoalu = new AMOALU
|
||||
storegen.io.typ := r_cpu_req_type
|
||||
storegen.io.din := r_cpu_req_data
|
||||
when (p_amo) {
|
||||
p_store_data <== amoalu.io.out
|
||||
}
|
||||
when (tag_hit && r_req_write && p_store_rdy || r_replay_amo) {
|
||||
p_store_idx <== Mux(r_replay_amo, Reg(Cat(replayer.io.data_req.bits.idx, replayer.io.data_req.bits.offset)), r_cpu_req_idx)
|
||||
p_store_way_id <== Mux(r_replay_amo, Reg(replayer.io.replay.bits.way_id), hit_way_id)
|
||||
p_store_type <== Mux(r_replay_amo, Reg(replayer.io.data_req.bits.typ), r_cpu_req_type)
|
||||
p_store_cmd <== Mux(r_replay_amo, Reg(replayer.io.data_req.bits.cmd), r_cpu_req_cmd)
|
||||
p_store_data <== storegen.io.dout
|
||||
}
|
||||
|
||||
// miss handling
|
||||
val mshr = new MSHRFile()
|
||||
mshr.io.req_val := tag_miss && r_req_readwrite && (!dirty || wb_rdy) && (!r_req_write || replayer.io.sdq_enq.ready)
|
||||
mshr.io.req_ppn := io.cpu.req_ppn
|
||||
mshr.io.req_idx := r_cpu_req_idx(indexmsb,indexlsb)
|
||||
mshr.io.req_tag := r_cpu_req_tag
|
||||
mshr.io.req_offset := r_cpu_req_idx(offsetmsb,0)
|
||||
mshr.io.req_cmd := r_cpu_req_cmd
|
||||
mshr.io.req_type := r_cpu_req_type
|
||||
mshr.io.req_sdq_id := replayer.io.sdq_id
|
||||
mshr.io.req_way_id := replaced_way_id
|
||||
mshr.io.mem_resp_val := io.mem.resp_val && (~rr_count === UFix(0))
|
||||
mshr.io.mem_resp_tag := io.mem.resp_tag
|
||||
mshr.io.mem_req <> wb.io.refill_req
|
||||
mshr.io.meta_req <> meta_arb.io.in(1)
|
||||
mshr.io.replay <> replayer.io.replay
|
||||
replayer.io.sdq_enq.valid := tag_miss && r_req_write && (!dirty || wb_rdy) && mshr.io.req_rdy
|
||||
replayer.io.sdq_enq.bits := storegen.io.dout
|
||||
data_arb.io.in(0).bits.inner_req.idx := mshr.io.mem_resp_idx
|
||||
data_arb.io.in(0).bits.way_en := UFixToOH(mshr.io.mem_resp_way_id.toUFix, NWAYS)
|
||||
|
||||
// replays
|
||||
val replay = replayer.io.data_req.bits
|
||||
val stall_replay = r_replay_amo || p_amo || p_store_valid
|
||||
val replay_val = replayer.io.data_req.valid && !stall_replay
|
||||
val replay_rdy = data_arb.io.in(1).ready
|
||||
data_arb.io.in(1).bits.inner_req.offset := replay.offset(offsetmsb,ramindexlsb)
|
||||
data_arb.io.in(1).bits.inner_req.idx := replay.idx
|
||||
data_arb.io.in(1).bits.inner_req.rw := replay.cmd === M_XWR
|
||||
data_arb.io.in(1).valid := replay_val
|
||||
data_arb.io.in(1).bits.way_en := UFixToOH(replayer.io.way_id, NWAYS)
|
||||
replayer.io.data_req.ready := replay_rdy && !stall_replay
|
||||
r_replay_amo <== replay_amo_val && replay_rdy && !stall_replay
|
||||
|
||||
// store write mask generation.
|
||||
// assumes store replays are higher-priority than pending stores.
|
||||
val maskgen = new StoreMaskGen
|
||||
val store_offset = Mux(!replay_val, p_store_idx(offsetmsb,0), replay.offset)
|
||||
maskgen.io.typ := Mux(!replay_val, p_store_type, replay.typ)
|
||||
maskgen.io.addr := store_offset(offsetlsb-1,0)
|
||||
val store_wmask_wide = maskgen.io.wmask << Cat(store_offset(ramindexlsb-1,offsetlsb), Bits(0, log2up(CPU_DATA_BITS/8))).toUFix
|
||||
val store_data = Mux(!replay_val, p_store_data, replay.data)
|
||||
val store_data_wide = Fill(MEM_DATA_BITS/CPU_DATA_BITS, store_data)
|
||||
data_arb.io.in(1).bits.inner_req.data := store_data_wide
|
||||
data_arb.io.in(1).bits.inner_req.wmask := store_wmask_wide
|
||||
data_arb.io.in(2).bits.inner_req.data := store_data_wide
|
||||
data_arb.io.in(2).bits.inner_req.wmask := store_wmask_wide
|
||||
|
||||
// load data subword mux/sign extension.
|
||||
// subword loads are delayed by one cycle.
|
||||
val loadgen = new LoadDataGen
|
||||
val loadgen_use_replay = Reg(replay_val && replay_rdy)
|
||||
loadgen.io.typ := Mux(loadgen_use_replay, Reg(replay.typ), r_cpu_req_type)
|
||||
loadgen.io.addr := Mux(loadgen_use_replay, Reg(replay.offset), r_cpu_req_idx)(ramindexlsb-1,0)
|
||||
loadgen.io.din := data_resp_mux
|
||||
|
||||
amoalu.io.cmd := p_store_cmd
|
||||
amoalu.io.typ := p_store_type
|
||||
amoalu.io.lhs := loadgen.io.r_dout.toUFix
|
||||
amoalu.io.rhs := p_store_data.toUFix
|
||||
|
||||
early_nack <== early_tag_nack || early_load_nack || r_cpu_req_val && r_req_amo || replay_amo_val || r_replay_amo
|
||||
|
||||
// reset and flush unit
|
||||
val flusher = new FlushUnit(lines)
|
||||
val flushed = Reg(resetVal = Bool(true))
|
||||
val flush_rdy = mshr.io.fence_rdy && wb_rdy && !p_store_valid
|
||||
flushed <== flushed && !r_cpu_req_val || r_cpu_req_val && r_req_flush && flush_rdy && flusher.io.req.ready
|
||||
flusher.io.req.valid := r_cpu_req_val && r_req_flush && flush_rdy && !flushed
|
||||
flusher.io.wb_req <> wb_arb.io.in(0)
|
||||
flusher.io.meta_req <> meta_arb.io.in(0)
|
||||
flusher.io.meta_resp <> meta.io.resp
|
||||
flusher.io.resp.ready := Bool(true) // we don't respond to flush requests
|
||||
|
||||
// we usually nack rather than reporting that the cache is not ready.
|
||||
// fences and flushes are the exceptions.
|
||||
val pending_fence = Reg(resetVal = Bool(false))
|
||||
pending_fence <== (r_cpu_req_val && r_req_fence || pending_fence) && !flush_rdy
|
||||
val nack_hit = p_store_match || r_req_write && !p_store_rdy
|
||||
val nack_miss = dirty && !wb_rdy || !mshr.io.req_rdy || r_req_write && !replayer.io.sdq_enq.ready
|
||||
val nack_flush = !flush_rdy && (r_req_fence || r_req_flush) ||
|
||||
!flushed && r_req_flush
|
||||
val nack = early_nack || r_req_readwrite && Mux(tag_match, nack_hit, nack_miss) || nack_flush
|
||||
|
||||
io.cpu.req_rdy := flusher.io.req.ready && !(r_cpu_req_val_ && r_req_flush) && !pending_fence
|
||||
io.cpu.resp_nack := r_cpu_req_val_ && !io.cpu.req_kill && nack
|
||||
io.cpu.resp_val := (tag_hit && !nack_hit && r_req_read) || replayer.io.cpu_resp_val
|
||||
io.cpu.resp_replay := replayer.io.cpu_resp_val
|
||||
io.cpu.resp_miss := tag_miss && !nack_miss && r_req_read
|
||||
io.cpu.resp_tag := Mux(replayer.io.cpu_resp_val, replayer.io.cpu_resp_tag, r_cpu_req_tag)
|
||||
io.cpu.resp_data := loadgen.io.dout
|
||||
io.cpu.resp_data_subword := loadgen.io.r_dout_subword
|
||||
|
||||
wb.io.mem_req.ready := io.mem.req_rdy
|
||||
io.mem.req_val := wb.io.mem_req.valid
|
||||
io.mem.req_rw := wb.io.mem_req.bits.rw
|
||||
io.mem.req_wdata := wb.io.mem_req_data
|
||||
io.mem.req_tag := wb.io.mem_req.bits.tag.toUFix
|
||||
io.mem.req_addr := wb.io.mem_req.bits.addr
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user