xact init transactors in coherence hub
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aa099a53fa
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@ -12,6 +12,12 @@ class HubMemReq extends Bundle {
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val is_probe_rep = Bool()
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}
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class TrackerAllocReq extends Bundle {
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val xact_init = new TransactionInit()
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val init_tile_id = Bits(width = TILE_ID_BITS)
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val data_valid = Bool()
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}
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class MemData extends Bundle {
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val data = Bits(width = MEM_DATA_BITS)
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}
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@ -154,6 +160,8 @@ trait FourStateCoherence extends CoherencePolicy {
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class XactTracker(id: Int) extends Component {
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val io = new Bundle {
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val mem_req = (new ioDecoupled) { new HubMemReq() }.flip
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val alloc_req = (new ioDecoupled) { new TrackerAllocReq() }
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val can_alloc = Bool(INPUT)
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val xact_finish = Bool(INPUT)
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val p_rep_has_data = Bool(INPUT)
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val x_init_has_data = Bool(INPUT)
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@ -162,22 +170,27 @@ class XactTracker(id: Int) extends Component {
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val rep_cnt_dec = Bits(NTILES, INPUT)
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val busy = Bool(OUTPUT)
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val addr = Bits(PADDR_BITS, OUTPUT)
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val tile_id = Bits(TILE_ID_BITS, OUTPUT)
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val init_tile_id = Bits(TILE_ID_BITS, OUTPUT)
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val tile_xact_id = Bits(TILE_XACT_ID_BITS, OUTPUT)
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val sharer_count = Bits(TILE_ID_BITS, OUTPUT)
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val t_type = Bits(TTYPE_BITS, OUTPUT)
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val pop_p_rep = Bool(OUTPUT)
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val pop_p_rep_data = Bool(OUTPUT)
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val pop_p_rep = Bits(NTILES, OUTPUT)
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val pop_p_rep_data = Bits(NTILES, OUTPUT)
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val pop_x_init = Bool(OUTPUT)
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val pop_x_init_data = Bool(OUTPUT)
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val send_x_rep_ack = Bool(OUTPUT)
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}
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val valid = Reg(resetVal = Bool(false))
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val addr = Reg{ Bits() }
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val t_type = Reg{ Bits() }
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val tile_id = Reg{ Bits() }
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val init_tile_id = Reg{ Bits() }
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val tile_xact_id = Reg{ Bits() }
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val probe_done = Reg{ Bits() }
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//TODO: Decrement the probe count when final data piece is written
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// Connent io.mem.ready sig to correct pop* outputs
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// P_rep and x_init must be popped on same cycle of receipt
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}
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abstract class CoherenceHub extends Component
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@ -204,23 +217,23 @@ class CoherenceHubNoDir extends CoherenceHub {
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}
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val trackerList = (0 until NGLOBAL_XACTS).map(new XactTracker(_))
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val busy_arr = Vec(NGLOBAL_XACTS){ Wire(){Bool()} }
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val addr_arr = Vec(NGLOBAL_XACTS){ Wire(){Bits(width=PADDR_BITS)} }
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val tile_id_arr = Vec(NGLOBAL_XACTS){ Wire(){Bits(width=TILE_ID_BITS)} }
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val tile_xact_id_arr = Vec(NGLOBAL_XACTS){ Wire(){Bits(width=TILE_XACT_ID_BITS)} }
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val t_type_arr = Vec(NGLOBAL_XACTS){ Wire(){Bits(width=TTYPE_BITS)} }
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val sh_count_arr = Vec(NGLOBAL_XACTS){ Wire(){Bits(width=TILE_ID_BITS)} }
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val send_x_rep_ack_arr = Vec(NGLOBAL_XACTS){ Wire(){Bool()} }
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val busy_arr = GenArray(NGLOBAL_XACTS){ Wire(){Bool()} }
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val addr_arr = GenArray(NGLOBAL_XACTS){ Wire(){Bits(width=PADDR_BITS)} }
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val init_tile_id_arr = GenArray(NGLOBAL_XACTS){ Wire(){Bits(width=TILE_ID_BITS)} }
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val tile_xact_id_arr = GenArray(NGLOBAL_XACTS){ Wire(){Bits(width=TILE_XACT_ID_BITS)} }
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val t_type_arr = GenArray(NGLOBAL_XACTS){ Wire(){Bits(width=TTYPE_BITS)} }
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val sh_count_arr = GenArray(NGLOBAL_XACTS){ Wire(){Bits(width=TILE_ID_BITS)} }
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val send_x_rep_ack_arr = GenArray(NGLOBAL_XACTS){ Wire(){Bool()} }
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val do_free_arr = Vec(NGLOBAL_XACTS){ Wire(){Bool()} }
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val p_rep_has_data_arr = Vec(NGLOBAL_XACTS){ Wire(){Bool()} }
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val p_rep_data_idx_arr = Vec(NGLOBAL_XACTS){ Wire(){Bits(width=log2up(NTILES))} }
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val rep_cnt_dec_arr = Vec(NGLOBAL_XACTS){ Wire(){Bits(width=NTILES)} }
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val do_free_arr = GenArray(NGLOBAL_XACTS){ Wire(){Bool()} }
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val p_rep_has_data_arr = GenArray(NGLOBAL_XACTS){ Wire(){Bool()} }
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val p_rep_data_idx_arr = GenArray(NGLOBAL_XACTS){ Wire(){Bits(width=log2up(NTILES))} }
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val rep_cnt_dec_arr = GenArray(NGLOBAL_XACTS){ Wire(){Bits(width=NTILES)} }
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for( i <- 0 until NGLOBAL_XACTS) {
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busy_arr.write( UFix(i), trackerList(i).io.busy)
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addr_arr.write( UFix(i), trackerList(i).io.addr)
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tile_id_arr.write( UFix(i), trackerList(i).io.tile_id)
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init_tile_id_arr.write( UFix(i), trackerList(i).io.init_tile_id)
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tile_xact_id_arr.write( UFix(i), trackerList(i).io.tile_xact_id)
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t_type_arr.write( UFix(i), trackerList(i).io.t_type)
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sh_count_arr.write( UFix(i), trackerList(i).io.sharer_count)
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@ -231,23 +244,6 @@ class CoherenceHubNoDir extends CoherenceHub {
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trackerList(i).io.rep_cnt_dec := rep_cnt_dec_arr.read(UFix(i))
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}
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// Nack conflicting transaction init attempts
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val aborting = Wire() { Bits(width = NTILES) }
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val initiating = Wire() { Bits(width = NTILES) }
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for( j <- 0 until NTILES ) {
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val init = io.tiles(j).xact_init
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val abort = io.tiles(j).xact_abort
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val conflicts = Bits(width = NGLOBAL_XACTS)
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for( i <- 0 until NGLOBAL_XACTS) {
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val t = trackerList(i).io
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conflicts(i) := t.busy(i) && coherenceConflict(t.addr, init.bits.address)
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}
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aborting(j) := (conflicts.orR || busy_arr.toBits().andR)
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abort.valid := init.valid && aborting
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abort.bits.tile_xact_id := init.bits.tile_xact_id
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init.ready := aborting(j) || initiating(j)
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}
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// Free finished transactions
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for( j <- 0 until NTILES ) {
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val finish = io.tiles(j).xact_finish
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@ -255,6 +251,7 @@ class CoherenceHubNoDir extends CoherenceHub {
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finish.ready := Bool(true)
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}
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// Reply to initial requestor
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// Forward memory responses from mem to tile
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val xrep_cnt = Reg(resetVal = UFix(0, log2up(REFILL_CYCLES)))
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val xrep_cnt_next = xrep_cnt + UFix(1)
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@ -267,11 +264,11 @@ class CoherenceHubNoDir extends CoherenceHub {
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io.tiles(j).xact_rep.bits.global_xact_id := idx
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io.tiles(j).xact_rep_data.bits.data := io.mem.resp_data
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readys := Mux(xrep_cnt === UFix(0), io.tiles(j).xact_rep.ready && io.tiles(j).xact_rep_data.ready, io.tiles(j).xact_rep_data.ready)
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io.tiles(j).xact_rep.valid := (UFix(j) === tile_id_arr.read(idx)) && ((io.mem.resp_val && xrep_cnt === UFix(0)) || send_x_rep_ack_arr.read(idx))
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io.tiles(j).xact_rep_data.valid := (UFix(j) === tile_id_arr.read(idx))
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io.tiles(j).xact_rep.valid := (UFix(j) === init_tile_id_arr.read(idx)) && ((io.mem.resp_val && xrep_cnt === UFix(0)) || send_x_rep_ack_arr.read(idx))
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io.tiles(j).xact_rep_data.valid := (UFix(j) === init_tile_id_arr.read(idx))
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}
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// If there were a ready signal due to e.g. intervening network use:
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//io.mem.resp_rdy := readys(tile_id_arr.read(idx)).xact_rep.ready
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//io.mem.resp_rdy := readys(init_tile_id_arr.read(idx)).xact_rep.ready
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// Create an arbiter for the one memory port
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// We have to arbitrate between the different trackers' memory requests
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@ -293,28 +290,70 @@ class CoherenceHubNoDir extends CoherenceHub {
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io.tiles(j).probe_rep_data.bits.data,
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io.tiles(j).xact_init_data.bits.data)))
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// Handle probe replies, which may or may not have data
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for( j <- 0 until NTILES ) {
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val p_rep = io.tiles(j).probe_rep
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val p_rep_data = io.tiles(j).probe_rep_data
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val idx = p_rep.bits.global_xact_id
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p_rep_has_data_arr.write(idx, p_rep.valid && p_rep.bits.has_data)
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p_rep_has_data_arr.write(idx, p_rep.valid && p_rep.bits.has_data && p_rep_data.valid)
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p_rep_data_idx_arr.write(idx, UFix(j))
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p_rep.ready := foldR(trackerList.map(_.io.pop_p_rep))(_ || _)
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p_rep_data.ready := foldR(trackerList.map(_.io.pop_p_rep_data))(_ || _)
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p_rep.ready := foldR(trackerList.map(_.io.pop_p_rep(j)))(_ || _)
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p_rep_data.ready := foldR(trackerList.map(_.io.pop_p_rep_data(j)))(_ || _)
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}
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for( i <- 0 until NGLOBAL_XACTS ) {
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val flags = Bits(width = NTILES)
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for( j <- 0 until NTILES) {
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val p_rep = io.tiles(j).probe_rep
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flags(j) := p_rep.valid && (p_rep.bits.global_xact_id === UFix(i))
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flags(j) := p_rep.valid && !p_rep.bits.has_data && (p_rep.bits.global_xact_id === UFix(i))
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}
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rep_cnt_dec_arr.write(UFix(i), flags)
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}
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// Nack conflicting transaction init attempts
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val aborting = Wire() { Bits(width = NTILES) }
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for( j <- 0 until NTILES ) {
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val x_init = io.tiles(j).xact_init
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val x_abort = io.tiles(j).xact_abort
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val conflicts = Bits(width = NGLOBAL_XACTS)
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for( i <- 0 until NGLOBAL_XACTS) {
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val t = trackerList(i).io
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conflicts(i) := t.busy(i) && coherenceConflict(t.addr, x_init.bits.address) &&
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!(x_init.bits.has_data && (UFix(j) === t.init_tile_id))
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// Don't abort writebacks stalled on mem.
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// TODO: This assumes overlapped writeback init reqs to
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// the same addr will never be issued; is this ok?
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}
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x_abort.bits.tile_xact_id := x_init.bits.tile_xact_id
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val want_to_abort = conflicts.orR || busy_arr.flatten().andR
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x_abort.valid := want_to_abort && x_init.valid
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aborting(j) := want_to_abort && x_abort.ready
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}
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// Handle transaction initiation requests
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// Only one allocation per cycle
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// Init requests may or may not have data
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val alloc_arb = (new Arbiter(NGLOBAL_XACTS)) { Bool() }
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val init_arb = (new Arbiter(NTILES)) { new TrackerAllocReq() }
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for( i <- 0 until NGLOBAL_XACTS ) {
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alloc_arb.io.in(i).valid := !trackerList(i).io.busy
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trackerList(i).io.can_alloc := alloc_arb.io.in(i).ready
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trackerList(i).io.alloc_req.bits := init_arb.io.out.bits
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trackerList(i).io.alloc_req.valid := init_arb.io.out.valid
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}
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// Pick a single request of these types to process
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//val xact_init_arb = (new Arbiter(NTILES)) { new TransactionInit() }
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//val probe_reply_arb = (new Arbiter(NTILES)) { new ProbeReply() }
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for( j <- 0 until NTILES ) {
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val x_init = io.tiles(j).xact_init
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val x_init_data = io.tiles(j).xact_init_data
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init_arb.io.in(j).valid := x_init.valid
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init_arb.io.in(j).bits.xact_init := x_init.bits
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init_arb.io.in(j).bits.init_tile_id := UFix(j)
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init_arb.io.in(j).bits.data_valid := x_init_data.valid
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x_init.ready := aborting(j) || foldR(trackerList.map(_.io.pop_x_init && init_arb.io.out.bits.init_tile_id === UFix(j)))(_||_)
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x_init_data.ready := aborting(j) || foldR(trackerList.map(_.io.pop_x_init_data && init_arb.io.out.bits.init_tile_id === UFix(j)))(_||_)
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}
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alloc_arb.io.out.ready := init_arb.io.out.valid && !busy_arr.flatten().andR &&
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!foldR(trackerList.map(t => t.io.busy && coherenceConflict(t.io.addr, init_arb.io.out.bits.xact_init.address)))(_||_)
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}
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