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Merge pull request #982 from freechipsproject/frontbus3

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Add a FrontBus to which low-bandwidth bus masters attach
This commit is contained in:
Wesley W. Terpstra 2017-09-06 02:38:55 +02:00 committed by GitHub
commit 55a0df4186
8 changed files with 178 additions and 49 deletions
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60
src/main/scala/coreplex/FrontBus.scala Normal file
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@ -0,0 +1,60 @@
// See LICENSE.SiFive for license details.
package freechips.rocketchip.coreplex
import Chisel._
import freechips.rocketchip.config.{Field, Parameters}
import freechips.rocketchip.diplomacy._
import freechips.rocketchip.tilelink._
import freechips.rocketchip.util._
case class FrontBusParams(
beatBytes: Int,
blockBytes: Int,
masterBuffering: BufferParams = BufferParams.default,
slaveBuffering: BufferParams = BufferParams.default
) extends TLBusParams
case object FrontBusParams extends Field[FrontBusParams]
class FrontBus(params: FrontBusParams)(implicit p: Parameters) extends TLBusWrapper(params, "FrontBus") {
private val master_buffer = LazyModule(new TLBuffer(params.masterBuffering))
private val master_fixer = LazyModule(new TLFIFOFixer(TLFIFOFixer.all))
master_buffer.suggestName(s"${busName}_master_TLBuffer")
master_fixer.suggestName(s"${busName}_master_TLFIFOFixer")
master_fixer.node :=* master_buffer.node
inwardNode :=* master_fixer.node
def fromSyncPorts(addBuffers: Int = 0, name: Option[String] = None): TLInwardNode = {
val (in, out) = bufferChain(addBuffers, name)
master_buffer.node :=* out
in
}
def fromSyncMasters(addBuffers: Int = 0, name: Option[String] = None): TLInwardNode = {
val (in, out) = bufferChain(addBuffers, name)
master_buffer.node :=* out
in
}
def fromCoherentChip: TLInwardNode = inwardNode
def toSystemBus : TLOutwardNode = outwardBufNode
}
/** Provides buses that serve as attachment points,
* for use in traits that connect individual devices or external ports.
*/
trait HasFrontBus extends HasSystemBus {
private val frontbusParams = p(FrontBusParams)
val frontbusBeatBytes = frontbusParams.beatBytes
val fbus = new FrontBus(frontbusParams)
sbus.fromFrontBus := fbus.toSystemBus
}

4
src/main/scala/coreplex/MemoryBus.scala
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@ -43,9 +43,7 @@ case class MemoryBusParams(
case object MemoryBusParams extends Field[MemoryBusParams]
/** Wrapper for creating TL nodes from a bus connected to the back of each mem channel */
class MemoryBus(params: MemoryBusParams)(implicit p: Parameters) extends TLBusWrapper(params)(p) {
xbar.suggestName("MemoryBus")
class MemoryBus(params: MemoryBusParams)(implicit p: Parameters) extends TLBusWrapper(params, "MemoryBus")(p) {
def fromCoherenceManager: TLInwardNode = inwardBufNode
def toDRAMController: TLOutwardNode = outwardBufNode
def toVariableWidthSlave: TLOutwardNode = outwardFragNode

5
src/main/scala/coreplex/PeripheryBus.scala
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@ -21,8 +21,7 @@ case class PeripheryBusParams(
case object PeripheryBusParams extends Field[PeripheryBusParams]
class PeripheryBus(params: PeripheryBusParams)(implicit p: Parameters) extends TLBusWrapper(params) {
xbar.suggestName("PeripheryBus")
class PeripheryBus(params: PeripheryBusParams)(implicit p: Parameters) extends TLBusWrapper(params, "PeripheryBus") {
def toFixedWidthSingleBeatSlave(widthBytes: Int) = {
TLFragmenter(widthBytes, params.blockBytes)(outwardWWNode)
@ -49,5 +48,5 @@ trait HasPeripheryBus extends HasSystemBus {
val pbus = new PeripheryBus(pbusParams)
// The peripheryBus hangs off of systemBus; here we convert TL-UH -> TL-UL
pbus.fromSystemBus := sbus.toPeripheryBus
pbus.fromSystemBus := sbus.toPeripheryBus()
}

26
src/main/scala/coreplex/RocketCoreplex.scala
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@ -35,34 +35,34 @@ trait HasRocketTiles extends HasSystemBus
// Make a wrapper for each tile that will wire it to coreplex devices and crossbars,
// according to the specified type of clock crossing.
val wiringTuple = localIntNodes.zip(tileParams).zipWithIndex
val rocket_tiles: Seq[RocketTileWrapper] = wiringTuple.map { case ((lip, c), i) =>
val rocket_tiles: Seq[RocketTileWrapper] = wiringTuple.map { case ((lip, tp), i) =>
val pWithExtra = p.alterPartial {
case TileKey => c
case BuildRoCC => c.rocc
case TileKey => tp
case BuildRoCC => tp.rocc
case SharedMemoryTLEdge => sharedMemoryTLEdge
}
val wrapper = crossing match {
case SynchronousCrossing(params) => {
val wrapper = LazyModule(new SyncRocketTile(c, i)(pWithExtra))
sbus.fromSyncTiles(params) :=* wrapper.masterNode
val wrapper = LazyModule(new SyncRocketTile(tp, i)(pWithExtra))
sbus.fromSyncTiles(params, tp.externalBuffers, tp.name) :=* wrapper.masterNode
wrapper.slaveNode :*= pbus.bufferToSlaves
wrapper
}
case AsynchronousCrossing(depth, sync) => {
val wrapper = LazyModule(new AsyncRocketTile(c, i)(pWithExtra))
sbus.fromAsyncTiles(depth, sync) :=* wrapper.masterNode
wrapper.slaveNode :*= pbus.toAsyncSlaves(sync)
val wrapper = LazyModule(new AsyncRocketTile(tp, i)(pWithExtra))
sbus.fromAsyncTiles(depth, sync, tp.externalBuffers, tp.name) :=* wrapper.masterNode
wrapper.slaveNode :*= pbus.toAsyncSlaves(sync, tp.name)
wrapper
}
case RationalCrossing(direction) => {
val wrapper = LazyModule(new RationalRocketTile(c, i)(pWithExtra))
sbus.fromRationalTiles(direction) :=* wrapper.masterNode
wrapper.slaveNode :*= pbus.toRationalSlaves
val wrapper = LazyModule(new RationalRocketTile(tp, i)(pWithExtra))
sbus.fromRationalTiles(direction, tp.externalBuffers, tp.name) :=* wrapper.masterNode
wrapper.slaveNode :*= pbus.toRationalSlaves(tp.name)
wrapper
}
}
wrapper.suggestName("tile") // Try to stabilize this name for downstream tools
tp.name.foreach(wrapper.suggestName) // Try to stabilize this name for downstream tools
// Local Interrupts must be synchronized to the core clock
// before being passed into this module.
@ -77,7 +77,7 @@ trait HasRocketTiles extends HasSystemBus
val periphIntXbar = LazyModule(new IntXbar)
periphIntXbar.intnode := clint.intnode // msip+mtip
periphIntXbar.intnode := plic.intnode // meip
if (c.core.useVM) periphIntXbar.intnode := plic.intnode // seip
if (tp.core.useVM) periphIntXbar.intnode := plic.intnode // seip
wrapper.periphIntNode := periphIntXbar.intnode
val coreIntXbar = LazyModule(new IntXbar)

69
src/main/scala/coreplex/SystemBus.scala
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@ -17,10 +17,10 @@ case class SystemBusParams(
case object SystemBusParams extends Field[SystemBusParams]
class SystemBus(params: SystemBusParams)(implicit p: Parameters) extends TLBusWrapper(params) {
xbar.suggestName("SystemBus")
class SystemBus(params: SystemBusParams)(implicit p: Parameters) extends TLBusWrapper(params, "SystemBus") {
private val master_splitter = LazyModule(new TLSplitter) // Allows cycle-free connection to external networks
master_splitter.suggestName(s"${busName}_master_TLSplitter")
inwardNode :=* master_splitter.node
def busView = master_splitter.node.edgesIn.head
@ -28,15 +28,24 @@ class SystemBus(params: SystemBusParams)(implicit p: Parameters) extends TLBusWr
protected def outwardSplitNode: TLOutwardNode = master_splitter.node
private val tile_fixer = LazyModule(new TLFIFOFixer(TLFIFOFixer.allUncacheable))
private val port_fixer = LazyModule(new TLFIFOFixer(TLFIFOFixer.all))
private val pbus_fixer = LazyModule(new TLFIFOFixer(TLFIFOFixer.all))
tile_fixer.suggestName(s"${busName}_tile_TLFIFOFixer")
master_splitter.node :=* tile_fixer.node
private val port_fixer = LazyModule(new TLFIFOFixer(TLFIFOFixer.all))
port_fixer.suggestName(s"${busName}_port_TLFIFOFixer")
master_splitter.node :=* port_fixer.node
private val pbus_fixer = LazyModule(new TLFIFOFixer(TLFIFOFixer.all))
pbus_fixer.suggestName(s"${busName}_pbus_TLFIFOFixer")
pbus_fixer.node :*= outwardWWNode
def toSplitSlaves: TLOutwardNode = outwardSplitNode
val toPeripheryBus: TLOutwardNode = pbus_fixer.node
def toPeripheryBus(addBuffers: Int = 0): TLOutwardNode = {
val (in, out) = bufferChain(addBuffers, name = Some("pbus"))
in := pbus_fixer.node
out
}
val toMemoryBus: TLOutwardNode = outwardNode
@ -44,27 +53,41 @@ class SystemBus(params: SystemBusParams)(implicit p: Parameters) extends TLBusWr
def fromCoherentChip: TLInwardNode = inwardNode
def fromSyncTiles(params: BufferParams): TLInwardNode = {
val buf = LazyModule(new TLBuffer(params))
tile_fixer.node :=* buf.node
buf.node
def fromFrontBus: TLInwardNode = master_splitter.node
def fromSyncTiles(params: BufferParams, addBuffers: Int = 0, name: Option[String] = None): TLInwardNode = {
val tile_buf = LazyModule(new TLBuffer(params))
name.foreach { n => tile_buf.suggestName(s"${busName}_${n}_TLBuffer") }
val (in, out) = bufferChain(addBuffers, name = name)
tile_fixer.node :=* out
in :=* tile_buf.node
tile_buf.node
}
def fromRationalTiles(dir: RationalDirection): TLRationalInwardNode = {
val sink = LazyModule(new TLRationalCrossingSink(direction = dir))
tile_fixer.node :=* sink.node
sink.node
def fromRationalTiles(dir: RationalDirection, addBuffers: Int = 0, name: Option[String] = None): TLRationalInwardNode = {
val tile_sink = LazyModule(new TLRationalCrossingSink(direction = dir))
name.foreach { n => tile_sink.suggestName(s"${busName}_${n}_TLRationalCrossingSink") }
val (in, out) = bufferChain(addBuffers, name = name)
tile_fixer.node :=* out
in :=* tile_sink.node
tile_sink.node
}
def fromAsyncTiles(depth: Int, sync: Int): TLAsyncInwardNode = {
val sink = LazyModule(new TLAsyncCrossingSink(depth, sync))
tile_fixer.node :=* sink.node
sink.node
def fromAsyncTiles(depth: Int, sync: Int, addBuffers: Int = 0, name: Option[String] = None): TLAsyncInwardNode = {
val tile_sink = LazyModule(new TLAsyncCrossingSink(depth, sync))
name.foreach { n => tile_sink.suggestName(s"${busName}_${n}_TLAsyncCrossingSink") }
val (in, out) = bufferChain(addBuffers, name = name)
tile_fixer.node :=* out
in :=* tile_sink.node
tile_sink.node
}
def fromSyncPorts(params: BufferParams = BufferParams.default, name: Option[String] = None): TLInwardNode = {
val buffer = LazyModule(new TLBuffer(params))
name.foreach{ n => buffer.suggestName(s"${n}_TLBuffer") }
name.foreach { n => buffer.suggestName(s"${busName}_${n}_TLBuffer") }
port_fixer.node :=* buffer.node
buffer.node
}
@ -73,21 +96,23 @@ class SystemBus(params: SystemBusParams)(implicit p: Parameters) extends TLBusWr
fromSyncPorts(params, name)
}
def fromAsyncPorts(depth: Int = 8, sync: Int = 3): TLAsyncInwardNode = {
def fromAsyncPorts(depth: Int = 8, sync: Int = 3, name : Option[String] = None): TLAsyncInwardNode = {
val sink = LazyModule(new TLAsyncCrossingSink(depth, sync))
name.foreach { n => sink.suggestName(s"${busName}_${n}_TLAsyncCrossingSink") }
port_fixer.node :=* sink.node
sink.node
}
def fromAsyncFIFOMaster(depth: Int = 8, sync: Int = 3): TLAsyncInwardNode = fromAsyncPorts(depth, sync)
def fromAsyncFIFOMaster(depth: Int = 8, sync: Int = 3, name: Option[String] = None): TLAsyncInwardNode = fromAsyncPorts(depth, sync, name)
def fromRationalPorts(dir: RationalDirection): TLRationalInwardNode = {
def fromRationalPorts(dir: RationalDirection, name: Option[String] = None): TLRationalInwardNode = {
val sink = LazyModule(new TLRationalCrossingSink(dir))
name.foreach{ n => sink.suggestName(s"${busName}_${n}_TLRationalCrossingSink") }
port_fixer.node :=* sink.node
sink.node
}
def fromRationalFIFOMaster(dir: RationalDirection): TLRationalInwardNode = fromRationalPorts(dir)
def fromRationalFIFOMaster(dir: RationalDirection, name: Option[String] = None): TLRationalInwardNode = fromRationalPorts(dir, name)
}
/** Provides buses that serve as attachment points,

4
src/main/scala/tile/RocketTile.scala
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@ -18,7 +18,9 @@ case class RocketTileParams(
rocc: Seq[RoCCParams] = Nil,
btb: Option[BTBParams] = Some(BTBParams()),
dataScratchpadBytes: Int = 0,
boundaryBuffers: Boolean = false) extends TileParams {
boundaryBuffers: Boolean = false,
name: Option[String] = Some("tile"),
externalBuffers: Int = 0) extends TileParams {
require(icache.isDefined)
require(dcache.isDefined)
}

25
src/main/scala/tilelink/Buffer.scala
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@ -77,3 +77,28 @@ object TLBuffer
buffer.node
}
}
class TLBufferChain(depth: Int)(implicit p: Parameters) extends LazyModule {
val nodeIn = TLInputNode()
val nodeOut = TLOutputNode()
val buf_chain = if (depth > 0) {
val chain = List.fill(depth)(LazyModule(new TLBuffer(BufferParams.default)))
(chain.init zip chain.tail) foreach { case(prev, next) => next.node :=* prev.node }
chain
} else {
List(LazyModule(new TLBuffer(BufferParams.none)))
}
buf_chain.head.node :=* nodeIn
nodeOut :=* buf_chain.last.node
lazy val module = new LazyModuleImp(this) {
val io = new Bundle {
val in = nodeIn.bundleIn
val out = nodeOut.bundleOut
}
}
}

34
src/main/scala/tilelink/Bus.scala
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@ -21,7 +21,8 @@ trait TLBusParams {
def blockOffset: Int = log2Up(blockBytes)
}
abstract class TLBusWrapper(params: TLBusParams)(implicit p: Parameters) extends TLBusParams {
abstract class TLBusWrapper(params: TLBusParams, val busName: String)(implicit p: Parameters) extends TLBusParams {
val beatBytes = params.beatBytes
val blockBytes = params.blockBytes
val masterBuffering = params.masterBuffering
@ -30,10 +31,17 @@ abstract class TLBusWrapper(params: TLBusParams)(implicit p: Parameters) extends
private val delayProb = p(TLBusDelayProbability)
protected val xbar = LazyModule(new TLXbar)
xbar.suggestName(busName)
private val master_buffer = LazyModule(new TLBuffer(masterBuffering))
master_buffer.suggestName(s"${busName}_master_TLBuffer")
private val slave_buffer = LazyModule(new TLBuffer(slaveBuffering))
slave_buffer.suggestName(s"${busName}_slave_TLBuffer")
private val slave_frag = LazyModule(new TLFragmenter(beatBytes, blockBytes))
slave_frag.suggestName(s"${busName}_slave_TLFragmenter")
private val slave_ww = LazyModule(new TLWidthWidget(beatBytes))
slave_ww.suggestName(s"${busName}_slave_TLWidthWidget")
private val delayedNode = if (delayProb > 0.0) {
val firstDelay = LazyModule(new TLDelayer(delayProb))
@ -59,46 +67,58 @@ abstract class TLBusWrapper(params: TLBusParams)(implicit p: Parameters) extends
protected def inwardNode: TLInwardNode = xbar.node
protected def inwardBufNode: TLInwardNode = master_buffer.node
protected def bufferChain(depth: Int, name: Option[String] = None): (TLInwardNode, TLOutwardNode) = {
val chain = LazyModule(new TLBufferChain(depth))
name.foreach { n => chain.suggestName(s"${busName}_${n}_TLBufferChain")}
(chain.nodeIn, chain.nodeOut)
}
def bufferFromMasters: TLInwardNode = inwardBufNode
def bufferToSlaves: TLOutwardNode = outwardBufNode
def toAsyncSlaves(sync: Int = 3): TLAsyncOutwardNode = {
def toAsyncSlaves(sync: Int = 3, name: Option[String] = None): TLAsyncOutwardNode = {
val source = LazyModule(new TLAsyncCrossingSource(sync))
name.foreach{ n => source.suggestName(s"${busName}_${n}_TLAsyncCrossingSource")}
source.node :*= outwardNode
source.node
}
def toRationalSlaves: TLRationalOutwardNode = {
def toRationalSlaves(name: Option[String] = None): TLRationalOutwardNode = {
val source = LazyModule(new TLRationalCrossingSource())
name.foreach{ n => source.suggestName(s"${busName}_${n}_TLRationalCrossingSource")}
source.node :*= outwardNode
source.node
}
def toVariableWidthSlaves: TLOutwardNode = outwardFragNode
def toAsyncVariableWidthSlaves(sync: Int = 3): TLAsyncOutwardNode = {
def toAsyncVariableWidthSlaves(sync: Int = 3, name: Option[String] = None): TLAsyncOutwardNode = {
val source = LazyModule(new TLAsyncCrossingSource(sync))
name.foreach {n => source.suggestName(s"${busName}_${name}_TLAsyncCrossingSource")}
source.node :*= outwardFragNode
source.node
}
def toRationalVariableWidthSlaves: TLRationalOutwardNode = {
def toRationalVariableWidthSlaves(name: Option[String] = None): TLRationalOutwardNode = {
val source = LazyModule(new TLRationalCrossingSource())
name.foreach {n => source.suggestName(s"${busName}_${name}_TLRationalCrossingSource")}
source.node :*= outwardFragNode
source.node
}
def toFixedWidthSlaves: TLOutwardNode = outwardWWNode
def toAsyncFixedWidthSlaves(sync: Int = 3): TLAsyncOutwardNode = {
def toAsyncFixedWidthSlaves(sync: Int = 3, name: Option[String] = None): TLAsyncOutwardNode = {
val source = LazyModule(new TLAsyncCrossingSource(sync))
name.foreach { n => source.suggestName(s"${busName}_${name}_TLAsyncCrossingSource")}
source.node := outwardWWNode
source.node
}
def toRationalFixedWidthSlaves: TLRationalOutwardNode = {
def toRationalFixedWidthSlaves(name: Option[String] = None): TLRationalOutwardNode = {
val source = LazyModule(new TLRationalCrossingSource())
name.foreach {n => source.suggestName(s"${busName}_${name}_TLRationalCrossingSource")}
source.node :*= outwardWWNode
source.node
}