From c1f42ce3d433c5e6595db2cd2398ecca0e016a43 Mon Sep 17 00:00:00 2001
From: Howard Mao <zhehao.mao@gmail.com>
Date: Fri, 30 Oct 2015 12:49:57 -0700
Subject: [PATCH] add an L1 cache request generator

---
 groundtest/src/main/scala/generator.scala | 53 ++++++++++++++++++++++-
 groundtest/src/main/scala/tile.scala      | 29 ++++++++++---
 2 files changed, 73 insertions(+), 9 deletions(-)

diff --git a/groundtest/src/main/scala/generator.scala b/groundtest/src/main/scala/generator.scala
index 0292e1ed..d104c22f 100644
--- a/groundtest/src/main/scala/generator.scala
+++ b/groundtest/src/main/scala/generator.scala
@@ -3,6 +3,7 @@ package groundtest
 import Chisel._
 import uncore._
 import junctions._
+import rocket._
 import scala.util.Random
 import cde.{Parameters, Field}
 
@@ -20,7 +21,7 @@ class UncachedTileLinkGenerator(id: Int)
     (implicit p: Parameters) extends TLModule()(p) with HasGeneratorParams {
 
   private val tlBlockOffset = tlBeatAddrBits + tlByteAddrBits
-  private val maxAddress = (p(MMIOBase) >> tlBlockOffset).toInt
+  private val maxAddress = (p(MMIOBase) >> tlBlockOffset).toInt / 2
   private val totalRequests = maxAddress / nGens
 
   val io = new Bundle {
@@ -81,6 +82,54 @@ class UncachedTileLinkGenerator(id: Int)
 
   assert(!io.mem.grant.valid || state != s_get ||
     io.mem.grant.bits.data === get_data,
-    s"Get received incorrect data in generator ${id}")
+    s"Get received incorrect data in uncached generator ${id}")
 }
 
+class HellaCacheGenerator(id: Int)
+    (implicit p: Parameters) extends L1HellaCacheModule()(p) with HasGeneratorParams {
+
+  private val wordOffset = log2Up(coreDataBits / 8)
+  private val maxAddress = (p(MMIOBase) >> wordOffset).toInt
+  private val startAddress = maxAddress / 2
+  private val totalRequests = (maxAddress - startAddress) / nGens
+
+  val io = new Bundle {
+    val finished = Bool(OUTPUT)
+    val mem = new HellaCacheIO
+  }
+
+  val (s_start :: s_write :: s_read :: s_finished :: Nil) = Enum(Bits(), 4)
+  val state = Reg(init = s_start)
+  val sending = Reg(init = Bool(false))
+
+  val (req_cnt, req_wrap) = Counter(
+    io.mem.resp.valid && io.mem.resp.bits.has_data, totalRequests)
+
+  val req_addr = UInt(startAddress) +
+                 Cat(req_cnt, UInt(id, log2Up(nGens)), UInt(0, wordOffset))
+  val req_data = Cat(UInt(id, log2Up(nGens)), req_cnt, req_addr)
+
+  io.mem.req.valid := sending
+  io.mem.req.bits.addr := req_addr
+  io.mem.req.bits.data := req_data
+  io.mem.req.bits.typ  := MT_D
+  io.mem.req.bits.cmd  := Mux(state === s_write, M_XWR, M_XRD)
+  io.mem.req.bits.tag  := UInt(0)
+  io.mem.req.bits.kill := Bool(false)
+  io.mem.req.bits.phys := Bool(true)
+
+  when (state === s_start) { sending := Bool(true); state := s_write }
+
+  when (io.mem.req.fire()) { sending := Bool(false) }
+
+  when (io.mem.resp.valid) {
+    sending := Bool(true)
+    state := Mux(state === s_write, s_read, s_write)
+  }
+
+  when (req_wrap) { sending := Bool(false); state := s_finished }
+
+  assert(!io.mem.resp.valid || !io.mem.resp.bits.has_data ||
+    io.mem.resp.bits.data === req_data,
+    s"Received incorrect data in cached generator ${id}")
+}
diff --git a/groundtest/src/main/scala/tile.scala b/groundtest/src/main/scala/tile.scala
index c481f68f..b9e50042 100644
--- a/groundtest/src/main/scala/tile.scala
+++ b/groundtest/src/main/scala/tile.scala
@@ -36,19 +36,34 @@ class DummyCache(implicit val p: Parameters) extends Module
 class GeneratorTile(id: Int, resetSignal: Bool)
                    (implicit val p: Parameters) extends Tile(resetSignal)(p)
                    with HasGeneratorParams {
-  val gen_finished = Wire(Vec(nGensPerTile, Bool()))
 
-  val arb = Module(new ClientUncachedTileLinkIOArbiter(nGensPerTile))
+  val gen_finished = Wire(Vec(2 * nGensPerTile, Bool()))
+
+  val uncacheArb = Module(new ClientUncachedTileLinkIOArbiter(nGensPerTile))
+  val cacheArb = Module(new HellaCacheArbiter(nGensPerTile)(dcacheParams))
+  val cache = Module(new HellaCache()(dcacheParams))
 
   for (i <- 0 until nGensPerTile) {
     val genid = id * nGensPerTile + i
-    val generator = Module(new UncachedTileLinkGenerator(genid))
-    arb.io.in(i) <> generator.io.mem
-    gen_finished(i) := generator.io.finished
+    val uncacheGen = Module(new UncachedTileLinkGenerator(genid))
+    val cacheGen = Module(new HellaCacheGenerator(genid)(dcacheParams))
+    val cacheIF = Module(new SimpleHellaCacheIF()(dcacheParams))
+    uncacheArb.io.in(i) <> uncacheGen.io.mem
+    cacheIF.io.requestor <> cacheGen.io.mem
+    cacheArb.io.requestor(i) <> cacheIF.io.cache
+    gen_finished(2 * i) := uncacheGen.io.finished
+    gen_finished(2 * i + 1) := cacheGen.io.finished
   }
 
-  io.uncached(0) <> arb.io.out
-  io.cached(0) <> Module(new DummyCache).io
+  cache.io.ptw.req.ready := Bool(false)
+  cache.io.ptw.resp.valid := Bool(false)
+  cache.io.cpu <> cacheArb.io.mem
+
+  assert(!cache.io.ptw.req.valid, 
+    "Cache should not be using virtual addressing")
+
+  io.uncached(0) <> uncacheArb.io.out
+  io.cached(0) <> cache.io.mem
 
   val all_done = gen_finished.reduce(_ && _)