inorder-mem: skeleton support for prefetch/writehints

9 files changed, 105 insertions, 36 deletions

diff --git a/src/cpu/inorder/cpu.cc b/src/cpu/inorder/cpu.cc
index c5f06c3b2..e17d82041 100644
--- a/src/cpu/inorder/cpu.cc
+++ b/src/cpu/inorder/cpu.cc
@@ -1264,6 +1264,21 @@ InOrderCPU::write(DynInstPtr inst)
     return mem_res->doDataAccess(inst);
 }
 
+void
+InOrderCPU::prefetch(DynInstPtr inst)
+{
+    Resource *mem_res = resPool->getResource(dataPortIdx);
+    return mem_res->prefetch(inst);
+}
+
+void
+InOrderCPU::writeHint(DynInstPtr inst)
+{
+    Resource *mem_res = resPool->getResource(dataPortIdx);
+    return mem_res->writeHint(inst);
+}
+
+
 TheISA::TLB*
 InOrderCPU::getITBPtr()
 {
diff --git a/src/cpu/inorder/cpu.hh b/src/cpu/inorder/cpu.hh
index fda2e4366..9426171c1 100644
--- a/src/cpu/inorder/cpu.hh
+++ b/src/cpu/inorder/cpu.hh
@@ -497,6 +497,16 @@ class InOrderCPU : public BaseCPU
      */
     Fault write(DynInstPtr inst);
 
+    /** Forwards an instruction prefetch to the appropriate data
+     *  resource (indexes into Resource Pool thru "dataPortIdx")
+     */
+    void prefetch(DynInstPtr inst);
+
+    /** Forwards an instruction writeHint to the appropriate data
+     *  resource (indexes into Resource Pool thru "dataPortIdx")
+     */
+    void writeHint(DynInstPtr inst);
+
     /** Executes a syscall.*/
     void syscall(int64_t callnum, int tid);
 
diff --git a/src/cpu/inorder/inorder_dyn_inst.cc b/src/cpu/inorder/inorder_dyn_inst.cc
index 692e3ff73..9355a9f6f 100644
--- a/src/cpu/inorder/inorder_dyn_inst.cc
+++ b/src/cpu/inorder/inorder_dyn_inst.cc
@@ -296,13 +296,13 @@ InOrderDynInst::syscall(int64_t callnum)
 void
 InOrderDynInst::prefetch(Addr addr, unsigned flags)
 {
-    panic("Prefetch Unimplemented\n");
+    cpu->prefetch(this);
 }
 
 void
 InOrderDynInst::writeHint(Addr addr, int size, unsigned flags)
 {
-    panic("Write-Hint Unimplemented\n");
+    cpu->writeHint(this);
 }
 
 /**
diff --git a/src/cpu/inorder/resource.hh b/src/cpu/inorder/resource.hh
index b857e59ed..0c0aad758 100644
--- a/src/cpu/inorder/resource.hh
+++ b/src/cpu/inorder/resource.hh
@@ -143,6 +143,13 @@ class Resource {
     virtual Fault doDataAccess(DynInstPtr inst)
     { panic("doDataAccess undefined for %s", name()); return NoFault; }
 
+    virtual void prefetch(DynInstPtr inst)
+    { panic("prefetch undefined for %s", name()); }
+
+    virtual void writeHint(DynInstPtr inst)
+    { panic("doDataAccess undefined for %s", name()); }
+
+
     /** Squash All Requests After This Seq Num */
     virtual void squash(DynInstPtr inst, int stage_num, InstSeqNum squash_seq_num, unsigned tid);
 
diff --git a/src/cpu/inorder/resources/agen_unit.cc b/src/cpu/inorder/resources/agen_unit.cc
index f462b12ea..44cd002ef 100644
--- a/src/cpu/inorder/resources/agen_unit.cc
+++ b/src/cpu/inorder/resources/agen_unit.cc
@@ -55,35 +55,18 @@ AGENUnit::execute(int slot_num)
             // Load/Store Instruction
             if (inst->isMemRef()) {
                 DPRINTF(InOrderAGEN, "[tid:%i] Generating Address for [sn:%i] (%s).\n",
-                    tid, inst->seqNum, inst->staticInst->getName());
+                        tid, inst->seqNum, inst->staticInst->getName());
 
+                fault = inst->calcEA();
+                inst->setMemAddr(inst->getEA());
 
-                // We are not handdling Prefetches quite yet
-                if (inst->isDataPrefetch() || inst->isInstPrefetch()) {
-                    panic("Prefetches arent handled yet.\n");
-                } else {
-                    if (inst->isLoad()) {
-                        fault = inst->calcEA();
-                        inst->setMemAddr(inst->getEA());
-                        //inst->setExecuted();
-
-                        DPRINTF(InOrderAGEN, "[tid:%i] [sn:%i] Effective address calculated to be: "
-                                "%#x.\n", tid, inst->seqNum, inst->getEA());
-                    } else if (inst->isStore()) {
-                        fault = inst->calcEA();
-                        inst->setMemAddr(inst->getEA());
+                DPRINTF(InOrderAGEN, "[tid:%i] [sn:%i] Effective address calculated to be: "
+                        "%#x.\n", tid, inst->seqNum, inst->getEA());
 
-                        DPRINTF(InOrderAGEN, "[tid:%i] [sn:%i] Effective address calculated to be: "
-                                "%#x.\n", tid, inst->seqNum, inst->getEA());
-                    } else {
-                        panic("Unexpected memory type!\n");
-                    }
-
-                    if (fault == NoFault) {
-                        agen_req->done();
-                    } else {
-                        fatal("%s encountered @ [sn:%i]",fault->name(), seq_num);
-                    }
+                if (fault == NoFault) {
+                    agen_req->done();
+                } else {
+                    fatal("%s encountered while calculating address for [sn:%i]",fault->name(), seq_num);
                 }
             } else {
                 DPRINTF(InOrderAGEN, "[tid:] Ignoring non-memory instruction [sn:%i].\n", tid, seq_num);
diff --git a/src/cpu/inorder/resources/cache_unit.cc b/src/cpu/inorder/resources/cache_unit.cc
index 6fe0bcf76..5e374fa40 100644
--- a/src/cpu/inorder/resources/cache_unit.cc
+++ b/src/cpu/inorder/resources/cache_unit.cc
@@ -230,11 +230,10 @@ CacheUnit::execute(int slot_num)
 
     DynInstPtr inst = cache_req->inst;
     int tid;
-    tid = inst->readTid();
     int seq_num;
-    seq_num = inst->seqNum;
-    //int stage_num = cache_req->getStageNum();
 
+    tid = inst->readTid();
+    seq_num = inst->seqNum;
     cache_req->fault = NoFault;
 
     switch (cache_req->cmd)
@@ -304,8 +303,13 @@ CacheUnit::execute(int slot_num)
                 tid, name(), cache_req->inst->getMemAddr());
 
         inst->setCurResSlot(slot_num);
-        //inst->memAccess();
-        inst->initiateAcc();
+
+        if (inst->isDataPrefetch() || inst->isInstPrefetch()) {
+            inst->execute();
+        } else {
+            inst->initiateAcc();
+        }
+
         break;
 
       case CompleteReadData:
@@ -313,7 +317,10 @@ CacheUnit::execute(int slot_num)
         DPRINTF(InOrderCachePort,
                 "[tid:%i]: [sn:%i]: Trying to Complete Data Access\n",
                 tid, inst->seqNum);
-        if (cache_req->isMemAccComplete()) {
+
+        if (cache_req->isMemAccComplete() ||
+            inst->isDataPrefetch() ||
+            inst->isInstPrefetch()) {
             cache_req->done();
         } else {
             DPRINTF(InOrderStall, "STALL: [tid:%i]: Data miss from %08p\n",
@@ -327,6 +334,45 @@ CacheUnit::execute(int slot_num)
     }
 }
 
+void
+CacheUnit::prefetch(DynInstPtr inst)
+{
+    warn_once("Prefetching currently unimplemented");
+
+    CacheReqPtr cache_req
+        = dynamic_cast<CacheReqPtr>(reqMap[inst->getCurResSlot()]);
+    assert(cache_req);
+
+    // Clean-Up cache resource request so
+    // other memory insts. can use them
+    cache_req->setCompleted();
+    cacheStatus = cacheAccessComplete;
+    cacheBlocked = false;
+    cache_req->setMemAccPending(false);
+    cache_req->setMemAccCompleted();
+    inst->unsetMemAddr();
+}
+
+
+void
+CacheUnit::writeHint(DynInstPtr inst)
+{
+    warn_once("Write Hints currently unimplemented");
+
+    CacheReqPtr cache_req
+        = dynamic_cast<CacheReqPtr>(reqMap[inst->getCurResSlot()]);
+    assert(cache_req);
+
+    // Clean-Up cache resource request so
+    // other memory insts. can use them
+    cache_req->setCompleted();
+    cacheStatus = cacheAccessComplete;
+    cacheBlocked = false;
+    cache_req->setMemAccPending(false);
+    cache_req->setMemAccCompleted();
+    inst->unsetMemAddr();
+}
+
 Fault
 CacheUnit::doDataAccess(DynInstPtr inst)
 {
diff --git a/src/cpu/inorder/resources/cache_unit.hh b/src/cpu/inorder/resources/cache_unit.hh
index 8cd2b89cb..219329683 100644
--- a/src/cpu/inorder/resources/cache_unit.hh
+++ b/src/cpu/inorder/resources/cache_unit.hh
@@ -172,6 +172,10 @@ class CacheUnit : public Resource
      */
     Fault doDataAccess(DynInstPtr inst);
 
+    void prefetch(DynInstPtr inst);
+
+    void writeHint(DynInstPtr inst);
+
     uint64_t getMemData(Packet *packet);
 
   protected:
diff --git a/src/cpu/inorder/resources/tlb_unit.cc b/src/cpu/inorder/resources/tlb_unit.cc
index dbf799661..8532a30ed 100644
--- a/src/cpu/inorder/resources/tlb_unit.cc
+++ b/src/cpu/inorder/resources/tlb_unit.cc
@@ -158,8 +158,8 @@ TLBUnit::execute(int slot_idx)
 
             if (tlb_req->fault != NoFault) {
                 DPRINTF(InOrderTLB, "[tid:%i]: %s encountered while translating "
-                        "addr:%08p for [sn:%i].\n", tid, tlb_req->fault->name(),
-                        tlb_req->memReq->getVaddr(), seq_num);
+                        "addr:%08p for [sn:%i] %s.\n", tid, tlb_req->fault->name(),
+                        tlb_req->memReq->getVaddr(), seq_num, inst->instName());
                 //insert(inst);
                 cpu->pipelineStage[stage_num]->setResStall(tlb_req, tid);
                 tlbBlocked[tid] = true;
diff --git a/src/cpu/inorder/resources/tlb_unit.hh b/src/cpu/inorder/resources/tlb_unit.hh
index b0cdac2a2..67e1bda1d 100644
--- a/src/cpu/inorder/resources/tlb_unit.hh
+++ b/src/cpu/inorder/resources/tlb_unit.hh
@@ -112,6 +112,10 @@ class TLBUnitRequest : public ResourceRequest {
             flags = inst->getMemFlags();
         }
 
+        if (req_size == 0 && (inst->isDataPrefetch() || inst->isInstPrefetch())) {
+            req_size = 8;
+        }
+
         // @TODO: Add Vaddr & Paddr functions
         inst->memReq = new Request(inst->readTid(), aligned_addr, req_size,
                                    flags, inst->readPC(), res->cpu->readCpuId(), inst->readTid());