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authorKorey Sewell <ksewell@umich.edu>2010-01-31 18:29:18 -0500
committerKorey Sewell <ksewell@umich.edu>2010-01-31 18:29:18 -0500
commit82c5a754e684af6522f339ab30d2c661ee9c220c (patch)
treec70b9e14c48dd30ef2de8927eca338a56218e951 /src/cpu/inorder/resources
parent349d86c0e4afb02962c9899bd5a3887ff2c55626 (diff)
downloadgem5-82c5a754e684af6522f339ab30d2c661ee9c220c.tar.xz
inorder: recvRetry bug fix
- on certain retry requests you can get an assertion failure - fix by allowing the request to literally "Retry" itself if it wasnt successful before, and then block any requests through cache port while waiting for the cache to be made available for access
Diffstat (limited to 'src/cpu/inorder/resources')
-rw-r--r--src/cpu/inorder/resources/cache_unit.cc53
-rw-r--r--src/cpu/inorder/resources/cache_unit.hh16
2 files changed, 16 insertions, 53 deletions
diff --git a/src/cpu/inorder/resources/cache_unit.cc b/src/cpu/inorder/resources/cache_unit.cc
index 4f9ed3eca..65782cb73 100644
--- a/src/cpu/inorder/resources/cache_unit.cc
+++ b/src/cpu/inorder/resources/cache_unit.cc
@@ -84,8 +84,7 @@ CacheUnit::CachePort::recvRetry()
CacheUnit::CacheUnit(string res_name, int res_id, int res_width,
int res_latency, InOrderCPU *_cpu, ThePipeline::Params *params)
: Resource(res_name, res_id, res_width, res_latency, _cpu),
- retryPkt(NULL), retrySlot(-1), cacheBlocked(false),
- predecoder(NULL)
+ cachePortBlocked(false), predecoder(NULL)
{
cachePort = new CachePort(this);
@@ -351,8 +350,8 @@ CacheUnit::write(DynInstPtr inst, T data, Addr addr, unsigned flags,
void
CacheUnit::execute(int slot_num)
{
- if (cacheBlocked) {
- DPRINTF(InOrderCachePort, "Cache Blocked. Cannot Access\n");
+ if (cachePortBlocked) {
+ DPRINTF(InOrderCachePort, "Cache Port Blocked. Cannot Access\n");
return;
}
@@ -470,8 +469,7 @@ CacheUnit::prefetch(DynInstPtr inst)
// Clean-Up cache resource request so
// other memory insts. can use them
cache_req->setCompleted();
- cacheStatus = cacheAccessComplete;
- cacheBlocked = false;
+ cachePortBlocked = false;
cache_req->setMemAccPending(false);
cache_req->setMemAccCompleted();
inst->unsetMemAddr();
@@ -490,8 +488,7 @@ CacheUnit::writeHint(DynInstPtr inst)
// Clean-Up cache resource request so
// other memory insts. can use them
cache_req->setCompleted();
- cacheStatus = cacheAccessComplete;
- cacheBlocked = false;
+ cachePortBlocked = false;
cache_req->setMemAccPending(false);
cache_req->setMemAccCompleted();
inst->unsetMemAddr();
@@ -555,28 +552,18 @@ CacheUnit::doCacheAccess(DynInstPtr inst, uint64_t *write_res)
if (do_access) {
if (!cachePort->sendTiming(cache_req->dataPkt)) {
DPRINTF(InOrderCachePort,
- "[tid:%i] [sn:%i] is waiting to retry request\n",
- tid, inst->seqNum);
-
- retrySlot = cache_req->getSlot();
- retryReq = cache_req;
- retryPkt = cache_req->dataPkt;
-
- cacheStatus = cacheWaitRetry;
-
- //cacheBlocked = true;
-
- DPRINTF(InOrderStall, "STALL: \n");
-
+ "[tid:%i] [sn:%i] cannot access cache, because port "
+ "is blocked. now waiting to retry request\n", tid,
+ inst->seqNum);
cache_req->setCompleted(false);
+ cachePortBlocked = true;
} else {
DPRINTF(InOrderCachePort,
"[tid:%i] [sn:%i] is now waiting for cache response\n",
tid, inst->seqNum);
cache_req->setCompleted();
cache_req->setMemAccPending();
- cacheStatus = cacheWaitResponse;
- cacheBlocked = false;
+ cachePortBlocked = false;
}
} else if (!do_access && memReq->isLLSC()){
// Store-Conditional instructions complete even if they "failed"
@@ -737,22 +724,12 @@ CacheUnit::processCacheCompletion(PacketPtr pkt)
void
CacheUnit::recvRetry()
{
- DPRINTF(InOrderCachePort, "Retrying Request for [tid:%i] [sn:%i]\n",
- retryReq->inst->readTid(), retryReq->inst->seqNum);
-
- assert(retryPkt != NULL);
- assert(cacheBlocked);
- assert(cacheStatus == cacheWaitRetry);
+ DPRINTF(InOrderCachePort, "Unblocking Cache Port. \n");
+
+ assert(cachePortBlocked);
- if (cachePort->sendTiming(retryPkt)) {
- cacheStatus = cacheWaitResponse;
- retryPkt = NULL;
- cacheBlocked = false;
- } else {
- DPRINTF(InOrderCachePort,
- "Retry Request for [tid:%i] [sn:%i] failed\n",
- retryReq->inst->readTid(), retryReq->inst->seqNum);
- }
+ // Clear the cache port for use again
+ cachePortBlocked = false;
}
CacheUnitEvent::CacheUnitEvent()
diff --git a/src/cpu/inorder/resources/cache_unit.hh b/src/cpu/inorder/resources/cache_unit.hh
index 26f6859ed..4162102c7 100644
--- a/src/cpu/inorder/resources/cache_unit.hh
+++ b/src/cpu/inorder/resources/cache_unit.hh
@@ -119,12 +119,6 @@ class CacheUnit : public Resource
virtual void recvRetry();
};
- enum CachePortStatus {
- cacheWaitResponse,
- cacheWaitRetry,
- cacheAccessComplete
- };
-
void init();
virtual ResourceRequest* getRequest(DynInstPtr _inst, int stage_num,
@@ -188,15 +182,7 @@ class CacheUnit : public Resource
/** Cache interface. */
CachePort *cachePort;
- CachePortStatus cacheStatus;
-
- CacheReqPtr retryReq;
-
- PacketPtr retryPkt;
-
- int retrySlot;
-
- bool cacheBlocked;
+ bool cachePortBlocked;
std::vector<Addr> addrList[ThePipeline::MaxThreads];