710 lines
29 KiB
Scala
710 lines
29 KiB
Scala
package rocket
|
|
|
|
import Chisel._
|
|
import Constants._
|
|
|
|
class MemData extends Bundle {
|
|
val data = Bits(width = MEM_DATA_BITS)
|
|
}
|
|
|
|
class MemReqCmd() extends Bundle
|
|
{
|
|
val rw = Bool()
|
|
val addr = UFix(width = PADDR_BITS - OFFSET_BITS)
|
|
val tag = Bits(width = MEM_TAG_BITS)
|
|
}
|
|
|
|
class MemResp () extends MemData
|
|
{
|
|
val tag = Bits(width = MEM_TAG_BITS)
|
|
}
|
|
|
|
class ioMem() extends Bundle
|
|
{
|
|
val req_cmd = (new ioDecoupled) { new MemReqCmd() }
|
|
val req_data = (new ioDecoupled) { new MemData() }
|
|
val resp = (new ioPipe) { new MemResp() }.flip
|
|
}
|
|
|
|
class TrackerProbeData extends Bundle {
|
|
val tile_id = Bits(width = TILE_ID_BITS)
|
|
}
|
|
|
|
class TrackerAllocReq extends Bundle {
|
|
val xact_init = new TransactionInit()
|
|
val tile_id = Bits(width = TILE_ID_BITS)
|
|
}
|
|
|
|
class TrackerDependency extends Bundle {
|
|
val global_xact_id = Bits(width = GLOBAL_XACT_ID_BITS)
|
|
}
|
|
|
|
class TransactionInit extends Bundle {
|
|
val t_type = Bits(width = X_INIT_TYPE_BITS)
|
|
val tile_xact_id = Bits(width = TILE_XACT_ID_BITS)
|
|
val address = UFix(width = PADDR_BITS - OFFSET_BITS)
|
|
}
|
|
|
|
class TransactionInitData extends MemData
|
|
|
|
class TransactionAbort extends Bundle {
|
|
val tile_xact_id = Bits(width = TILE_XACT_ID_BITS)
|
|
}
|
|
|
|
class ProbeRequest extends Bundle {
|
|
val p_type = Bits(width = P_REQ_TYPE_BITS)
|
|
val global_xact_id = Bits(width = GLOBAL_XACT_ID_BITS)
|
|
val address = Bits(width = PADDR_BITS - OFFSET_BITS)
|
|
}
|
|
|
|
class ProbeReply extends Bundle {
|
|
val p_type = Bits(width = P_REP_TYPE_BITS)
|
|
val global_xact_id = Bits(width = GLOBAL_XACT_ID_BITS)
|
|
}
|
|
|
|
class ProbeReplyData extends MemData
|
|
|
|
class TransactionReply extends MemData {
|
|
val t_type = Bits(width = X_REP_TYPE_BITS)
|
|
val tile_xact_id = Bits(width = TILE_XACT_ID_BITS)
|
|
val global_xact_id = Bits(width = GLOBAL_XACT_ID_BITS)
|
|
val require_ack = Bool()
|
|
}
|
|
|
|
class TransactionFinish extends Bundle {
|
|
val global_xact_id = Bits(width = GLOBAL_XACT_ID_BITS)
|
|
}
|
|
|
|
class ioTileLink extends Bundle {
|
|
val xact_init = (new ioDecoupled) { new TransactionInit() }
|
|
val xact_init_data = (new ioDecoupled) { new TransactionInitData() }
|
|
val xact_abort = (new ioDecoupled) { new TransactionAbort() }.flip
|
|
val probe_req = (new ioDecoupled) { new ProbeRequest() }.flip
|
|
val probe_rep = (new ioDecoupled) { new ProbeReply() }
|
|
val probe_rep_data = (new ioDecoupled) { new ProbeReplyData() }
|
|
val xact_rep = (new ioPipe) { new TransactionReply() }.flip
|
|
val xact_finish = (new ioDecoupled) { new TransactionFinish() }
|
|
}
|
|
|
|
object cpuCmdToRW {
|
|
def apply(cmd: Bits): (Bool, Bool) = {
|
|
val store = (cmd === M_XWR)
|
|
val load = (cmd === M_XRD)
|
|
val amo = cmd(3).toBool
|
|
val read = load || amo || (cmd === M_PFR) || (cmd === M_PFW)
|
|
val write = store || amo
|
|
(read, write)
|
|
}
|
|
}
|
|
|
|
trait CoherencePolicy { }
|
|
|
|
trait ThreeStateIncoherence extends CoherencePolicy {
|
|
val tileInvalid :: tileClean :: tileDirty :: Nil = Enum(3){ UFix() }
|
|
|
|
def isHit ( cmd: Bits, state: UFix): Bool = {
|
|
val (read, write) = cpuCmdToRW(cmd)
|
|
( state === tileClean || state === tileDirty)
|
|
}
|
|
|
|
def isValid (state: UFix): Bool = {
|
|
state != tileInvalid
|
|
}
|
|
|
|
def needsWriteback (state: UFix): Bool = {
|
|
state === tileDirty
|
|
}
|
|
|
|
def newStateOnWriteback() = tileInvalid
|
|
def newStateOnFlush() = tileInvalid
|
|
def newState(cmd: Bits, state: UFix): UFix = {
|
|
val (read, write) = cpuCmdToRW(cmd)
|
|
Mux(write, tileDirty, Mux(read, Mux(state === tileDirty, tileDirty, tileClean), state))
|
|
}
|
|
def newStateOnHit(cmd: Bits, state: UFix): UFix = newState(cmd, state)
|
|
def newTransactionOnPrimaryMiss(cmd: Bits, state: UFix): UFix = {
|
|
val (read, write) = cpuCmdToRW(cmd)
|
|
Mux(write || cmd === M_PFW, X_INIT_READ_EXCLUSIVE, X_INIT_READ_SHARED)
|
|
}
|
|
def newTransactionOnSecondaryMiss(cmd: Bits, state: UFix, outstanding: TransactionInit): UFix = {
|
|
val (read, write) = cpuCmdToRW(cmd)
|
|
Mux(write, X_INIT_READ_EXCLUSIVE, outstanding.t_type)
|
|
}
|
|
def needsSecondaryXact(cmd: Bits, outstanding: TransactionInit): Bool = Bool(false)
|
|
def newStateOnTransactionRep(incoming: TransactionReply, outstanding: TransactionInit): UFix = {
|
|
Mux(outstanding.t_type === X_INIT_READ_EXCLUSIVE, tileDirty, tileClean)
|
|
}
|
|
def newStateOnProbeReq(incoming: ProbeRequest, state: UFix): Bits = state
|
|
def newProbeReply (incoming: ProbeRequest, has_data: Bool): ProbeReply = {
|
|
val reply = Wire() { new ProbeReply() }
|
|
reply.p_type := P_REP_INVALIDATE_ACK
|
|
reply.global_xact_id := UFix(0)
|
|
reply
|
|
}
|
|
def probeReplyHasData (reply: ProbeReply): Bool = Bool(false)
|
|
def transactionInitHasData (init: TransactionInit): Bool = (init.t_type === X_INIT_WRITE_UNCACHED)
|
|
}
|
|
|
|
trait FourStateCoherence extends CoherencePolicy {
|
|
|
|
val tileInvalid :: tileShared :: tileExclusiveClean :: tileExclusiveDirty :: Nil = Enum(4){ UFix() }
|
|
val globalInvalid :: globalShared :: globalExclusiveClean :: Nil = Enum(3){ UFix() }
|
|
val probeInvalidate :: probeDowngrade :: probeCopy :: Nil = Enum(3){ UFix() }
|
|
|
|
def isHit ( cmd: Bits, state: UFix): Bool = {
|
|
val (read, write) = cpuCmdToRW(cmd)
|
|
Mux(write, (state === tileExclusiveClean || state === tileExclusiveDirty),
|
|
(state === tileShared || state === tileExclusiveClean || state === tileExclusiveDirty))
|
|
}
|
|
|
|
//TODO: do we need isPresent() for determining that a line needs to be
|
|
//upgraded but that no replacement is needed?
|
|
|
|
def isValid (state: UFix): Bool = {
|
|
state != tileInvalid
|
|
}
|
|
|
|
def needsWriteback (state: UFix): Bool = {
|
|
state === tileExclusiveDirty
|
|
}
|
|
|
|
def newStateOnWriteback() = tileInvalid
|
|
def newStateOnFlush() = tileInvalid
|
|
def newStateOnHit(cmd: Bits, state: UFix): UFix = {
|
|
val (read, write) = cpuCmdToRW(cmd)
|
|
Mux(write, tileExclusiveDirty, state)
|
|
}
|
|
def newTransactionOnPrimaryMiss(cmd: Bits, state: UFix): UFix = {
|
|
val (read, write) = cpuCmdToRW(cmd)
|
|
Mux(write || cmd === M_PFW, X_INIT_READ_EXCLUSIVE, X_INIT_READ_SHARED)
|
|
}
|
|
def newTransactionOnSecondaryMiss(cmd: Bits, state: UFix, outstanding: TransactionInit): UFix = {
|
|
val (read, write) = cpuCmdToRW(cmd)
|
|
Mux(write, X_INIT_READ_EXCLUSIVE, outstanding.t_type)
|
|
}
|
|
def needsSecondaryXact(cmd: Bits, outstanding: TransactionInit): Bool = {
|
|
val (read, write) = cpuCmdToRW(cmd)
|
|
(read && (outstanding.t_type === X_INIT_READ_UNCACHED || outstanding.t_type === X_INIT_WRITE_UNCACHED)) ||
|
|
(write && (outstanding.t_type != X_INIT_READ_EXCLUSIVE))
|
|
}
|
|
def newStateOnTransactionRep(incoming: TransactionReply, outstanding: TransactionInit): UFix = {
|
|
MuxLookup(incoming.t_type, tileInvalid, Array(
|
|
X_REP_READ_SHARED -> tileShared,
|
|
X_REP_READ_EXCLUSIVE -> Mux(outstanding.t_type === X_INIT_READ_EXCLUSIVE, tileExclusiveDirty, tileExclusiveClean),
|
|
X_REP_READ_EXCLUSIVE_ACK -> tileExclusiveDirty,
|
|
X_REP_READ_UNCACHED -> tileInvalid,
|
|
X_REP_WRITE_UNCACHED -> tileInvalid
|
|
))
|
|
}
|
|
|
|
def newStateOnProbeReq(incoming: ProbeRequest, state: UFix): Bits = {
|
|
MuxLookup(incoming.p_type, state, Array(
|
|
probeInvalidate -> tileInvalid,
|
|
probeDowngrade -> tileShared,
|
|
probeCopy -> state
|
|
))
|
|
}
|
|
|
|
def newProbeReply (incoming: ProbeRequest, state: UFix): ProbeReply = {
|
|
val reply = Wire() { new ProbeReply() }
|
|
val with_data = MuxLookup(incoming.p_type, P_REP_INVALIDATE_DATA, Array(
|
|
probeInvalidate -> P_REP_INVALIDATE_DATA,
|
|
probeDowngrade -> P_REP_DOWNGRADE_DATA,
|
|
probeCopy -> P_REP_COPY_DATA
|
|
))
|
|
val without_data = MuxLookup(incoming.p_type, P_REP_INVALIDATE_ACK, Array(
|
|
probeInvalidate -> P_REP_INVALIDATE_ACK,
|
|
probeDowngrade -> P_REP_DOWNGRADE_ACK,
|
|
probeCopy -> P_REP_COPY_ACK
|
|
))
|
|
reply.p_type := Mux(needsWriteback(state), with_data, without_data)
|
|
reply.global_xact_id := incoming.global_xact_id
|
|
reply
|
|
}
|
|
def probeReplyHasData (reply: ProbeReply): Bool = {
|
|
(reply.p_type === P_REP_INVALIDATE_DATA ||
|
|
reply.p_type === P_REP_DOWNGRADE_DATA ||
|
|
reply.p_type === P_REP_COPY_DATA)
|
|
}
|
|
def transactionInitHasData (init: TransactionInit): Bool = {
|
|
(init.t_type === X_INIT_WRITE_UNCACHED)
|
|
}
|
|
def transactionReplyHasData (reply: TransactionReply): Bool = {
|
|
(reply.t_type != X_REP_WRITE_UNCACHED && reply.t_type != X_REP_READ_EXCLUSIVE_ACK)
|
|
}
|
|
}
|
|
|
|
class XactTracker(ntiles: Int, id: Int) extends Component with FourStateCoherence {
|
|
val io = new Bundle {
|
|
val alloc_req = (new ioDecoupled) { new TrackerAllocReq }.flip
|
|
val p_data = (new ioPipe) { new TrackerProbeData }
|
|
val can_alloc = Bool(INPUT)
|
|
val xact_finish = Bool(INPUT)
|
|
val p_rep_cnt_dec = Bits(ntiles, INPUT)
|
|
val p_req_cnt_inc = Bits(ntiles, INPUT)
|
|
val p_rep_data = (new ioPipe) { new ProbeReplyData }.flip
|
|
val x_init_data = (new ioPipe) { new TransactionInitData }.flip
|
|
val sent_x_rep_ack = Bool(INPUT)
|
|
val p_rep_data_dep = (new ioPipe) { new TrackerDependency }.flip
|
|
val x_init_data_dep = (new ioPipe) { new TrackerDependency }.flip
|
|
|
|
val mem_req_cmd = (new ioDecoupled) { new MemReqCmd }
|
|
val mem_req_data = (new ioDecoupled) { new MemData }
|
|
val mem_req_lock = Bool(OUTPUT)
|
|
val probe_req = (new ioDecoupled) { new ProbeRequest }
|
|
val busy = Bool(OUTPUT)
|
|
val addr = Bits(PADDR_BITS - OFFSET_BITS, OUTPUT)
|
|
val init_tile_id = Bits(TILE_ID_BITS, OUTPUT)
|
|
val p_rep_tile_id = Bits(TILE_ID_BITS, OUTPUT)
|
|
val tile_xact_id = Bits(TILE_XACT_ID_BITS, OUTPUT)
|
|
val sharer_count = Bits(TILE_ID_BITS+1, OUTPUT)
|
|
val t_type = Bits(X_INIT_TYPE_BITS, OUTPUT)
|
|
val push_p_req = Bits(ntiles, OUTPUT)
|
|
val pop_p_rep = Bits(ntiles, OUTPUT)
|
|
val pop_p_rep_data = Bits(ntiles, OUTPUT)
|
|
val pop_p_rep_dep = Bits(ntiles, OUTPUT)
|
|
val pop_x_init = Bits(ntiles, OUTPUT)
|
|
val pop_x_init_data = Bits(ntiles, OUTPUT)
|
|
val pop_x_init_dep = Bits(ntiles, OUTPUT)
|
|
val send_x_rep_ack = Bool(OUTPUT)
|
|
}
|
|
|
|
def sendProbeReqType(t_type: UFix, global_state: UFix): UFix = {
|
|
MuxLookup(t_type, P_REQ_COPY, Array(
|
|
X_INIT_READ_SHARED -> P_REQ_DOWNGRADE,
|
|
X_INIT_READ_EXCLUSIVE -> P_REQ_INVALIDATE,
|
|
X_INIT_READ_UNCACHED -> P_REQ_COPY,
|
|
X_INIT_WRITE_UNCACHED -> P_REQ_INVALIDATE
|
|
))
|
|
}
|
|
|
|
def needsMemRead(t_type: UFix, global_state: UFix): Bool = {
|
|
(t_type != X_INIT_WRITE_UNCACHED)
|
|
}
|
|
|
|
def needsAckRep(t_type: UFix, global_state: UFix): Bool = {
|
|
(t_type === X_INIT_WRITE_UNCACHED)
|
|
}
|
|
|
|
def doMemReqWrite(req_cmd: ioDecoupled[MemReqCmd], req_data: ioDecoupled[MemData], lock: Bool, data: ioPipe[MemData], trigger: Bool, cmd_sent: Bool, pop_data: Bits, pop_dep: Bits, at_front_of_dep_queue: Bool, tile_id: UFix) {
|
|
req_cmd.valid := !cmd_sent && at_front_of_dep_queue
|
|
req_cmd.bits.rw := Bool(true)
|
|
req_data.valid := data.valid && at_front_of_dep_queue
|
|
req_data.bits := data.bits
|
|
lock := at_front_of_dep_queue
|
|
when(req_cmd.ready && req_cmd.valid) {
|
|
cmd_sent := Bool(true)
|
|
}
|
|
when(req_data.ready && req_data.valid) {
|
|
pop_data := UFix(1) << tile_id
|
|
mem_cnt := mem_cnt_next
|
|
when(mem_cnt_next === UFix(0)) {
|
|
pop_dep := UFix(1) << tile_id
|
|
trigger := Bool(false)
|
|
}
|
|
}
|
|
}
|
|
|
|
def doMemReqRead(req_cmd: ioDecoupled[MemReqCmd], trigger: Bool) {
|
|
req_cmd.valid := Bool(true)
|
|
req_cmd.bits.rw := Bool(false)
|
|
when(req_cmd.ready) {
|
|
trigger := Bool(false)
|
|
}
|
|
}
|
|
|
|
val s_idle :: s_ack :: s_mem :: s_probe :: s_busy :: Nil = Enum(5){ UFix() }
|
|
val state = Reg(resetVal = s_idle)
|
|
val addr_ = Reg{ UFix() }
|
|
val t_type_ = Reg{ Bits() }
|
|
val init_tile_id_ = Reg{ Bits() }
|
|
val tile_xact_id_ = Reg{ Bits() }
|
|
val p_rep_count = if (ntiles == 1) UFix(0) else Reg(resetVal = UFix(0, width = log2up(ntiles)))
|
|
val p_req_flags = Reg(resetVal = Bits(0, width = ntiles))
|
|
val p_rep_tile_id_ = Reg{ Bits() }
|
|
val x_needs_read = Reg(resetVal = Bool(false))
|
|
val x_init_data_needs_write = Reg(resetVal = Bool(false))
|
|
val p_rep_data_needs_write = Reg(resetVal = Bool(false))
|
|
val x_w_mem_cmd_sent = Reg(resetVal = Bool(false))
|
|
val p_w_mem_cmd_sent = Reg(resetVal = Bool(false))
|
|
val mem_cnt = Reg(resetVal = UFix(0, width = log2up(REFILL_CYCLES)))
|
|
val mem_cnt_next = mem_cnt + UFix(1)
|
|
val mem_cnt_max = ~UFix(0, width = log2up(REFILL_CYCLES))
|
|
|
|
io.busy := state != s_idle
|
|
io.addr := addr_
|
|
io.init_tile_id := init_tile_id_
|
|
io.p_rep_tile_id := p_rep_tile_id_
|
|
io.tile_xact_id := tile_xact_id_
|
|
io.sharer_count := UFix(ntiles) // TODO: Broadcast only
|
|
io.t_type := t_type_
|
|
|
|
io.mem_req_cmd.valid := Bool(false)
|
|
io.mem_req_cmd.bits.rw := Bool(false)
|
|
io.mem_req_cmd.bits.addr := addr_
|
|
io.mem_req_cmd.bits.tag := UFix(id)
|
|
io.mem_req_data.valid := Bool(false)
|
|
io.mem_req_data.bits.data := UFix(0)
|
|
io.mem_req_lock := Bool(false)
|
|
io.probe_req.valid := Bool(false)
|
|
io.probe_req.bits.p_type := sendProbeReqType(t_type_, UFix(0))
|
|
io.probe_req.bits.global_xact_id := UFix(id)
|
|
io.probe_req.bits.address := addr_
|
|
io.push_p_req := Bits(0, width = ntiles)
|
|
io.pop_p_rep := Bits(0, width = ntiles)
|
|
io.pop_p_rep_data := Bits(0, width = ntiles)
|
|
io.pop_p_rep_dep := Bits(0, width = ntiles)
|
|
io.pop_x_init := Bits(0, width = ntiles)
|
|
io.pop_x_init_data := Bits(0, width = ntiles)
|
|
io.pop_x_init_dep := Bits(0, width = ntiles)
|
|
io.send_x_rep_ack := Bool(false)
|
|
|
|
switch (state) {
|
|
is(s_idle) {
|
|
when( io.alloc_req.valid && io.can_alloc ) {
|
|
addr_ := io.alloc_req.bits.xact_init.address
|
|
t_type_ := io.alloc_req.bits.xact_init.t_type
|
|
init_tile_id_ := io.alloc_req.bits.tile_id
|
|
tile_xact_id_ := io.alloc_req.bits.xact_init.tile_xact_id
|
|
x_init_data_needs_write := transactionInitHasData(io.alloc_req.bits.xact_init)
|
|
x_needs_read := needsMemRead(io.alloc_req.bits.xact_init.t_type, UFix(0))
|
|
if(ntiles > 1) p_rep_count := UFix(ntiles-1)
|
|
val p_req_initial_flags = ~( UFix(1) << io.alloc_req.bits.tile_id ) //TODO: Broadcast only
|
|
p_req_flags := p_req_initial_flags
|
|
mem_cnt := UFix(0)
|
|
p_w_mem_cmd_sent := Bool(false)
|
|
x_w_mem_cmd_sent := Bool(false)
|
|
io.pop_x_init := UFix(1) << io.alloc_req.bits.tile_id
|
|
state := Mux(p_req_initial_flags.orR, s_probe, s_mem)
|
|
}
|
|
}
|
|
is(s_probe) {
|
|
when(p_req_flags.orR) {
|
|
io.push_p_req := p_req_flags
|
|
io.probe_req.valid := Bool(true)
|
|
}
|
|
when(io.p_req_cnt_inc.orR) {
|
|
p_req_flags := p_req_flags & ~io.p_req_cnt_inc // unflag sent reqs
|
|
}
|
|
when(io.p_rep_cnt_dec.orR) {
|
|
val p_rep_count_next = p_rep_count - PopCount(io.p_rep_cnt_dec)
|
|
io.pop_p_rep := io.p_rep_cnt_dec
|
|
if(ntiles > 1) p_rep_count := p_rep_count_next
|
|
when(p_rep_count === UFix(1)) {
|
|
io.pop_p_rep := Bool(true)
|
|
state := s_mem
|
|
}
|
|
}
|
|
when(io.p_data.valid) {
|
|
p_rep_data_needs_write := Bool(true)
|
|
p_rep_tile_id_ := io.p_data.bits.tile_id
|
|
}
|
|
}
|
|
is(s_mem) {
|
|
when (p_rep_data_needs_write) {
|
|
doMemReqWrite(io.mem_req_cmd,
|
|
io.mem_req_data,
|
|
io.mem_req_lock,
|
|
io.p_rep_data,
|
|
p_rep_data_needs_write,
|
|
p_w_mem_cmd_sent,
|
|
io.pop_p_rep_data,
|
|
io.pop_p_rep_dep,
|
|
io.p_rep_data_dep.valid && (io.p_rep_data_dep.bits.global_xact_id === UFix(id)),
|
|
p_rep_tile_id_)
|
|
} . elsewhen(x_init_data_needs_write) {
|
|
doMemReqWrite(io.mem_req_cmd,
|
|
io.mem_req_data,
|
|
io.mem_req_lock,
|
|
io.x_init_data,
|
|
x_init_data_needs_write,
|
|
x_w_mem_cmd_sent,
|
|
io.pop_x_init_data,
|
|
io.pop_x_init_dep,
|
|
io.x_init_data_dep.valid && (io.x_init_data_dep.bits.global_xact_id === UFix(id)),
|
|
init_tile_id_)
|
|
} . elsewhen (x_needs_read) {
|
|
doMemReqRead(io.mem_req_cmd, x_needs_read)
|
|
} . otherwise {
|
|
state := Mux(needsAckRep(t_type_, UFix(0)), s_ack, s_busy)
|
|
}
|
|
}
|
|
is(s_ack) {
|
|
io.send_x_rep_ack := Bool(true)
|
|
when(io.sent_x_rep_ack) { state := s_busy }
|
|
}
|
|
is(s_busy) { // Nothing left to do but wait for transaction to complete
|
|
when (io.xact_finish) {
|
|
state := s_idle
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
abstract class CoherenceHub(ntiles: Int) extends Component with CoherencePolicy {
|
|
val io = new Bundle {
|
|
val tiles = Vec(ntiles) { new ioTileLink() }.flip
|
|
val mem = new ioMem
|
|
}
|
|
}
|
|
|
|
class CoherenceHubNull extends CoherenceHub(1) {
|
|
|
|
val x_init = io.tiles(0).xact_init
|
|
val is_write = x_init.bits.t_type === X_INIT_WRITE_UNCACHED
|
|
x_init.ready := io.mem.req_cmd.ready && !(is_write && io.mem.resp.valid) //stall write req/resp to handle previous read resp
|
|
io.mem.req_cmd.valid := x_init.valid && !(is_write && io.mem.resp.valid)
|
|
io.mem.req_cmd.bits.rw := is_write
|
|
io.mem.req_cmd.bits.tag := x_init.bits.tile_xact_id
|
|
io.mem.req_cmd.bits.addr := x_init.bits.address
|
|
io.mem.req_data <> io.tiles(0).xact_init_data
|
|
|
|
val x_rep = io.tiles(0).xact_rep
|
|
x_rep.bits.t_type := Mux(io.mem.resp.valid, X_REP_READ_EXCLUSIVE, X_REP_WRITE_UNCACHED)
|
|
x_rep.bits.tile_xact_id := Mux(io.mem.resp.valid, io.mem.resp.bits.tag, x_init.bits.tile_xact_id)
|
|
x_rep.bits.global_xact_id := UFix(0) // don't care
|
|
x_rep.bits.data := io.mem.resp.bits.data
|
|
x_rep.bits.require_ack := Bool(true)
|
|
x_rep.valid := io.mem.resp.valid || x_init.valid && is_write && io.mem.req_cmd.ready
|
|
|
|
io.tiles(0).xact_abort.valid := Bool(false)
|
|
io.tiles(0).xact_finish.ready := Bool(true)
|
|
io.tiles(0).probe_req.valid := Bool(false)
|
|
io.tiles(0).probe_rep.ready := Bool(true)
|
|
io.tiles(0).probe_rep_data.ready := Bool(true)
|
|
}
|
|
|
|
|
|
class CoherenceHubBroadcast(ntiles: Int) extends CoherenceHub(ntiles) with FourStateCoherence{
|
|
|
|
def coherenceConflict(addr1: Bits, addr2: Bits): Bool = (addr1 === addr2)
|
|
|
|
def getTransactionReplyType(t_type: UFix, count: UFix): Bits = {
|
|
MuxLookup(t_type, X_REP_READ_UNCACHED, Array(
|
|
X_INIT_READ_SHARED -> Mux(count > UFix(0), X_REP_READ_SHARED, X_REP_READ_EXCLUSIVE),
|
|
X_INIT_READ_EXCLUSIVE -> X_REP_READ_EXCLUSIVE,
|
|
X_INIT_READ_UNCACHED -> X_REP_READ_UNCACHED,
|
|
X_INIT_WRITE_UNCACHED -> X_REP_WRITE_UNCACHED
|
|
))
|
|
}
|
|
|
|
val trackerList = (0 until NGLOBAL_XACTS).map(new XactTracker(ntiles, _))
|
|
|
|
val busy_arr = Vec(NGLOBAL_XACTS){ Wire(){Bool()} }
|
|
val addr_arr = Vec(NGLOBAL_XACTS){ Wire(){Bits(width=PADDR_BITS-OFFSET_BITS)} }
|
|
val init_tile_id_arr = Vec(NGLOBAL_XACTS){ Wire(){Bits(width=TILE_ID_BITS)} }
|
|
val tile_xact_id_arr = Vec(NGLOBAL_XACTS){ Wire(){Bits(width=TILE_XACT_ID_BITS)} }
|
|
val t_type_arr = Vec(NGLOBAL_XACTS){ Wire(){Bits(width=X_INIT_TYPE_BITS)} }
|
|
val sh_count_arr = Vec(NGLOBAL_XACTS){ Wire(){Bits(width=TILE_ID_BITS)} }
|
|
val send_x_rep_ack_arr = Vec(NGLOBAL_XACTS){ Wire(){Bool()} }
|
|
|
|
val do_free_arr = Vec(NGLOBAL_XACTS){ Wire(){Bool()} }
|
|
val p_rep_cnt_dec_arr = VecBuf(NGLOBAL_XACTS){ Vec(ntiles){ Wire(){Bool()} } }
|
|
val p_req_cnt_inc_arr = VecBuf(NGLOBAL_XACTS){ Vec(ntiles){ Wire(){Bool()} } }
|
|
val sent_x_rep_ack_arr = Vec(NGLOBAL_XACTS){ Wire(){ Bool()} }
|
|
val p_data_tile_id_arr = Vec(NGLOBAL_XACTS){ Wire(){ Bits(width = TILE_ID_BITS)} }
|
|
val p_data_valid_arr = Vec(NGLOBAL_XACTS){ Wire(){ Bool()} }
|
|
|
|
for( i <- 0 until NGLOBAL_XACTS) {
|
|
val t = trackerList(i).io
|
|
busy_arr(i) := t.busy
|
|
addr_arr(i) := t.addr
|
|
init_tile_id_arr(i) := t.init_tile_id
|
|
tile_xact_id_arr(i) := t.tile_xact_id
|
|
t_type_arr(i) := t.t_type
|
|
sh_count_arr(i) := t.sharer_count
|
|
send_x_rep_ack_arr(i) := t.send_x_rep_ack
|
|
t.xact_finish := do_free_arr(i)
|
|
t.p_data.bits.tile_id := p_data_tile_id_arr(i)
|
|
t.p_data.valid := p_data_valid_arr(i)
|
|
t.p_rep_cnt_dec := p_rep_cnt_dec_arr(i).toBits
|
|
t.p_req_cnt_inc := p_req_cnt_inc_arr(i).toBits
|
|
t.sent_x_rep_ack := sent_x_rep_ack_arr(i)
|
|
do_free_arr(i) := Bool(false)
|
|
sent_x_rep_ack_arr(i) := Bool(false)
|
|
p_data_tile_id_arr(i) := Bits(0, width = TILE_ID_BITS)
|
|
p_data_valid_arr(i) := Bool(false)
|
|
for( j <- 0 until ntiles) {
|
|
p_rep_cnt_dec_arr(i)(j) := Bool(false)
|
|
p_req_cnt_inc_arr(i)(j) := Bool(false)
|
|
}
|
|
}
|
|
|
|
val p_rep_data_dep_list = List.fill(ntiles)((new queue(NGLOBAL_XACTS)){new TrackerDependency}) // depth must >= NPRIMARY
|
|
val x_init_data_dep_list = List.fill(ntiles)((new queue(NGLOBAL_XACTS)){new TrackerDependency}) // depth should >= NPRIMARY
|
|
|
|
// Free finished transactions
|
|
for( j <- 0 until ntiles ) {
|
|
val finish = io.tiles(j).xact_finish
|
|
do_free_arr(finish.bits.global_xact_id) := finish.valid
|
|
finish.ready := Bool(true)
|
|
}
|
|
|
|
// Reply to initial requestor
|
|
// Forward memory responses from mem to tile or arbitrate to ack
|
|
val mem_idx = io.mem.resp.bits.tag
|
|
val ack_idx = PriorityEncoder(send_x_rep_ack_arr.toBits)
|
|
for( j <- 0 until ntiles ) {
|
|
val rep = io.tiles(j).xact_rep
|
|
rep.bits.t_type := UFix(0)
|
|
rep.bits.tile_xact_id := UFix(0)
|
|
rep.bits.global_xact_id := UFix(0)
|
|
rep.bits.data := io.mem.resp.bits.data
|
|
rep.bits.require_ack := Bool(true)
|
|
rep.valid := Bool(false)
|
|
when(io.mem.resp.valid) {
|
|
rep.bits.t_type := getTransactionReplyType(t_type_arr(mem_idx), sh_count_arr(mem_idx))
|
|
rep.bits.tile_xact_id := tile_xact_id_arr(mem_idx)
|
|
rep.bits.global_xact_id := mem_idx
|
|
rep.valid := (UFix(j) === init_tile_id_arr(mem_idx))
|
|
} . otherwise {
|
|
rep.bits.t_type := getTransactionReplyType(t_type_arr(ack_idx), sh_count_arr(ack_idx))
|
|
rep.bits.tile_xact_id := tile_xact_id_arr(ack_idx)
|
|
rep.bits.global_xact_id := ack_idx
|
|
val do_send_ack = (UFix(j) === init_tile_id_arr(ack_idx)) && send_x_rep_ack_arr.toBits.orR
|
|
rep.valid := do_send_ack
|
|
sent_x_rep_ack_arr(ack_idx) := do_send_ack
|
|
}
|
|
}
|
|
// If there were a ready signal due to e.g. intervening network use:
|
|
//io.mem.resp.ready := io.tiles(init_tile_id_arr.read(mem_idx)).xact_rep.ready
|
|
|
|
// Create an arbiter for the one memory port
|
|
// We have to arbitrate between the different trackers' memory requests
|
|
// and once we have picked a request, get the right write data
|
|
val mem_req_cmd_arb = (new LockingArbiter(NGLOBAL_XACTS)) { new MemReqCmd() }
|
|
val mem_req_data_arb = (new LockingArbiter(NGLOBAL_XACTS)) { new MemData() }
|
|
for( i <- 0 until NGLOBAL_XACTS ) {
|
|
mem_req_cmd_arb.io.in(i) <> trackerList(i).io.mem_req_cmd
|
|
mem_req_cmd_arb.io.lock(i) <> trackerList(i).io.mem_req_lock
|
|
mem_req_data_arb.io.in(i) <> trackerList(i).io.mem_req_data
|
|
mem_req_data_arb.io.lock(i) <> trackerList(i).io.mem_req_lock
|
|
}
|
|
io.mem.req_cmd <> mem_req_cmd_arb.io.out
|
|
io.mem.req_data <> mem_req_data_arb.io.out
|
|
|
|
// Handle probe replies, which may or may not have data
|
|
for( j <- 0 until ntiles ) {
|
|
val p_rep = io.tiles(j).probe_rep
|
|
val p_rep_data = io.tiles(j).probe_rep_data
|
|
val idx = p_rep.bits.global_xact_id
|
|
val pop_p_reps = trackerList.map(_.io.pop_p_rep(j).toBool)
|
|
val do_pop = foldR(pop_p_reps)(_ || _)
|
|
p_rep.ready := Bool(true)
|
|
p_rep_data_dep_list(j).io.enq.valid := do_pop
|
|
p_rep_data_dep_list(j).io.enq.bits.global_xact_id := OHToUFix(pop_p_reps)
|
|
p_rep_data.ready := foldR(trackerList.map(_.io.pop_p_rep_data(j)))(_ || _)
|
|
p_data_valid_arr(idx) := p_rep.valid && probeReplyHasData(p_rep.bits)
|
|
p_data_tile_id_arr(idx) := UFix(j)
|
|
p_rep_data_dep_list(j).io.deq.ready := foldR(trackerList.map(_.io.pop_p_rep_dep(j).toBool))(_||_)
|
|
}
|
|
for( i <- 0 until NGLOBAL_XACTS ) {
|
|
trackerList(i).io.p_rep_data.valid := io.tiles(trackerList(i).io.p_rep_tile_id).probe_rep_data.valid
|
|
trackerList(i).io.p_rep_data.bits := io.tiles(trackerList(i).io.p_rep_tile_id).probe_rep_data.bits
|
|
|
|
trackerList(i).io.p_rep_data_dep.valid := MuxLookup(trackerList(i).io.p_rep_tile_id, p_rep_data_dep_list(0).io.deq.valid, (0 until ntiles).map( j => UFix(j) -> p_rep_data_dep_list(j).io.deq.valid))
|
|
trackerList(i).io.p_rep_data_dep.bits := MuxLookup(trackerList(i).io.p_rep_tile_id, p_rep_data_dep_list(0).io.deq.bits, (0 until ntiles).map( j => UFix(j) -> p_rep_data_dep_list(j).io.deq.bits))
|
|
|
|
for( j <- 0 until ntiles) {
|
|
val p_rep = io.tiles(j).probe_rep
|
|
p_rep_cnt_dec_arr(i)(j) := p_rep.valid && (p_rep.bits.global_xact_id === UFix(i))
|
|
}
|
|
}
|
|
|
|
// Nack conflicting transaction init attempts
|
|
val s_idle :: s_abort_drain :: s_abort_send :: s_abort_complete :: Nil = Enum(4){ UFix() }
|
|
val abort_state_arr = Vec(ntiles) { Reg(resetVal = s_idle) }
|
|
val want_to_abort_arr = Vec(ntiles) { Wire() { Bool()} }
|
|
for( j <- 0 until ntiles ) {
|
|
val x_init = io.tiles(j).xact_init
|
|
val x_init_data = io.tiles(j).xact_init_data
|
|
val x_abort = io.tiles(j).xact_abort
|
|
val abort_cnt = Reg(resetVal = UFix(0, width = log2up(REFILL_CYCLES)))
|
|
val conflicts = Vec(NGLOBAL_XACTS) { Wire() { Bool() } }
|
|
for( i <- 0 until NGLOBAL_XACTS) {
|
|
val t = trackerList(i).io
|
|
conflicts(i) := t.busy && x_init.valid && coherenceConflict(t.addr, x_init.bits.address)
|
|
}
|
|
x_abort.bits.tile_xact_id := x_init.bits.tile_xact_id
|
|
want_to_abort_arr(j) := x_init.valid && (conflicts.toBits.orR || busy_arr.toBits.andR || (!x_init_data_dep_list(j).io.enq.ready && transactionInitHasData(x_init.bits)))
|
|
|
|
x_abort.valid := Bool(false)
|
|
switch(abort_state_arr(j)) {
|
|
is(s_idle) {
|
|
when(want_to_abort_arr(j)) {
|
|
when(transactionInitHasData(x_init.bits)) {
|
|
abort_state_arr(j) := s_abort_drain
|
|
} . otherwise {
|
|
abort_state_arr(j) := s_abort_send
|
|
}
|
|
}
|
|
}
|
|
is(s_abort_drain) { // raises x_init_data.ready below
|
|
when(x_init_data.valid) {
|
|
abort_cnt := abort_cnt + UFix(1)
|
|
}
|
|
when(abort_cnt === ~UFix(0, width = log2up(REFILL_CYCLES))) {
|
|
abort_state_arr(j) := s_abort_send
|
|
}
|
|
}
|
|
is(s_abort_send) { // nothing is dequeued for now
|
|
x_abort.valid := Bool(true)
|
|
when(x_abort.ready) {
|
|
abort_state_arr(j) := s_abort_complete
|
|
}
|
|
}
|
|
is(s_abort_complete) { // raises x_init.ready below
|
|
abort_state_arr(j) := s_idle
|
|
}
|
|
}
|
|
}
|
|
|
|
// Handle transaction initiation requests
|
|
// Only one allocation per cycle
|
|
// Init requests may or may not have data
|
|
val alloc_arb = (new Arbiter(NGLOBAL_XACTS)) { Bool() }
|
|
val init_arb = (new Arbiter(ntiles)) { new TrackerAllocReq() }
|
|
for( i <- 0 until NGLOBAL_XACTS ) {
|
|
alloc_arb.io.in(i).valid := !trackerList(i).io.busy
|
|
trackerList(i).io.can_alloc := alloc_arb.io.in(i).ready
|
|
trackerList(i).io.alloc_req.bits := init_arb.io.out.bits
|
|
trackerList(i).io.alloc_req.valid := init_arb.io.out.valid
|
|
|
|
trackerList(i).io.x_init_data.bits := io.tiles(trackerList(i).io.init_tile_id).xact_init_data.bits
|
|
trackerList(i).io.x_init_data.valid := io.tiles(trackerList(i).io.init_tile_id).xact_init_data.valid
|
|
trackerList(i).io.x_init_data_dep.bits := MuxLookup(trackerList(i).io.init_tile_id, x_init_data_dep_list(0).io.deq.bits, (0 until ntiles).map( j => UFix(j) -> x_init_data_dep_list(j).io.deq.bits))
|
|
trackerList(i).io.x_init_data_dep.valid := MuxLookup(trackerList(i).io.init_tile_id, x_init_data_dep_list(0).io.deq.valid, (0 until ntiles).map( j => UFix(j) -> x_init_data_dep_list(j).io.deq.valid))
|
|
}
|
|
for( j <- 0 until ntiles ) {
|
|
val x_init = io.tiles(j).xact_init
|
|
val x_init_data = io.tiles(j).xact_init_data
|
|
val x_init_data_dep = x_init_data_dep_list(j).io.deq
|
|
init_arb.io.in(j).valid := (abort_state_arr(j) === s_idle) && !want_to_abort_arr(j) && x_init.valid
|
|
init_arb.io.in(j).bits.xact_init := x_init.bits
|
|
init_arb.io.in(j).bits.tile_id := UFix(j)
|
|
val pop_x_inits = trackerList.map(_.io.pop_x_init(j).toBool)
|
|
val do_pop = foldR(pop_x_inits)(_||_)
|
|
x_init_data_dep_list(j).io.enq.valid := do_pop && transactionInitHasData(x_init.bits) && (abort_state_arr(j) === s_idle)
|
|
x_init_data_dep_list(j).io.enq.bits.global_xact_id := OHToUFix(pop_x_inits)
|
|
x_init.ready := (abort_state_arr(j) === s_abort_complete) || do_pop
|
|
x_init_data.ready := (abort_state_arr(j) === s_abort_drain) || foldR(trackerList.map(_.io.pop_x_init_data(j).toBool))(_||_)
|
|
x_init_data_dep.ready := foldR(trackerList.map(_.io.pop_x_init_dep(j).toBool))(_||_)
|
|
}
|
|
|
|
alloc_arb.io.out.ready := init_arb.io.out.valid
|
|
|
|
// Handle probe request generation
|
|
// Must arbitrate for each request port
|
|
val p_req_arb_arr = List.fill(ntiles)((new Arbiter(NGLOBAL_XACTS)) { new ProbeRequest() })
|
|
for( j <- 0 until ntiles ) {
|
|
for( i <- 0 until NGLOBAL_XACTS ) {
|
|
val t = trackerList(i).io
|
|
p_req_arb_arr(j).io.in(i).bits := t.probe_req.bits
|
|
p_req_arb_arr(j).io.in(i).valid := t.probe_req.valid && t.push_p_req(j)
|
|
p_req_cnt_inc_arr(i)(j) := p_req_arb_arr(j).io.in(i).ready
|
|
}
|
|
p_req_arb_arr(j).io.out <> io.tiles(j).probe_req
|
|
}
|
|
|
|
}
|