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-rw-r--r--src/mem/protocol/MESI_Three_Level-L0cache.sm70
-rw-r--r--src/mem/protocol/MESI_Three_Level-L1cache.sm90
-rw-r--r--src/mem/protocol/MESI_Three_Level-msg.sm5
3 files changed, 66 insertions, 99 deletions
diff --git a/src/mem/protocol/MESI_Three_Level-L0cache.sm b/src/mem/protocol/MESI_Three_Level-L0cache.sm
index 8ab0a92cb..5bbc83bd0 100644
--- a/src/mem/protocol/MESI_Three_Level-L0cache.sm
+++ b/src/mem/protocol/MESI_Three_Level-L0cache.sm
@@ -48,9 +48,6 @@ machine(L0Cache, "MESI Directory L0 Cache")
// Base states
// The cache entry has not been allocated.
- NP, AccessPermission:Invalid, desc="Not present in either cache";
-
- // The cache entry has been allocated, but is not in use.
I, AccessPermission:Invalid;
// The cache entry is in shared mode. The processor can read this entry
@@ -67,6 +64,10 @@ machine(L0Cache, "MESI Directory L0 Cache")
// Transient States
+ // The cache controller has requested an instruction. It will be stored
+ // in the shared state so that the processor can read it.
+ Inst_IS, AccessPermission:Busy;
+
// The cache controller has requested that this entry be fetched in
// shared state so that the processor can read it.
IS, AccessPermission:Busy;
@@ -100,7 +101,6 @@ machine(L0Cache, "MESI Directory L0 Cache")
Data, desc="Data for processor";
Data_Exclusive, desc="Data for processor";
- Data_Stale, desc="Data for processor, but not for storage";
Ack, desc="Ack for processor";
Ack_all, desc="Last ack for processor";
@@ -172,7 +172,7 @@ machine(L0Cache, "MESI Directory L0 Cache")
} else if (is_valid(cache_entry)) {
return cache_entry.CacheState;
}
- return State:NP;
+ return State:I;
}
void setState(TBE tbe, Entry cache_entry, Address addr, State state) {
@@ -266,8 +266,6 @@ machine(L0Cache, "MESI Directory L0 Cache")
trigger(Event:Data_Exclusive, in_msg.Addr, cache_entry, tbe);
} else if(in_msg.Class == CoherenceClass:DATA) {
trigger(Event:Data, in_msg.Addr, cache_entry, tbe);
- } else if(in_msg.Class == CoherenceClass:STALE_DATA) {
- trigger(Event:Data_Stale, in_msg.Addr, cache_entry, tbe);
} else if (in_msg.Class == CoherenceClass:ACK) {
trigger(Event:Ack, in_msg.Addr, cache_entry, tbe);
} else if (in_msg.Class == CoherenceClass:WB_ACK) {
@@ -421,6 +419,7 @@ machine(L0Cache, "MESI Directory L0 Cache")
out_msg.Dest := createMachineID(MachineType:L1Cache, version);
out_msg.MessageSize := MessageSizeType:Writeback_Data;
}
+ cache_entry.Dirty := false;
}
action(fi_sendInvAck, "fi", desc="send data to the L2 cache") {
@@ -447,13 +446,13 @@ machine(L0Cache, "MESI Directory L0 Cache")
assert(is_valid(cache_entry));
out_msg.Addr := address;
out_msg.Class := CoherenceClass:PUTX;
- out_msg.DataBlk := cache_entry.DataBlk;
out_msg.Dirty := cache_entry.Dirty;
out_msg.Sender:= machineID;
out_msg.Dest := createMachineID(MachineType:L1Cache, version);
if (cache_entry.Dirty) {
out_msg.MessageSize := MessageSizeType:Writeback_Data;
+ out_msg.DataBlk := cache_entry.DataBlk;
} else {
out_msg.MessageSize := MessageSizeType:Writeback_Control;
}
@@ -466,6 +465,12 @@ machine(L0Cache, "MESI Directory L0 Cache")
sequencer.readCallback(address, cache_entry.DataBlk);
}
+ action(hx_load_hit, "hx", desc="If not prefetch, notify sequencer the load completed.") {
+ assert(is_valid(cache_entry));
+ DPRINTF(RubySlicc, "%s\n", cache_entry.DataBlk);
+ sequencer.readCallback(address, cache_entry.DataBlk, true);
+ }
+
action(hh_store_hit, "\h", desc="If not prefetch, notify sequencer that store completed.") {
assert(is_valid(cache_entry));
DPRINTF(RubySlicc, "%s\n", cache_entry.DataBlk);
@@ -473,6 +478,13 @@ machine(L0Cache, "MESI Directory L0 Cache")
cache_entry.Dirty := true;
}
+ action(hhx_store_hit, "\hx", desc="If not prefetch, notify sequencer that store completed.") {
+ assert(is_valid(cache_entry));
+ DPRINTF(RubySlicc, "%s\n", cache_entry.DataBlk);
+ sequencer.writeCallback(address, cache_entry.DataBlk, true);
+ cache_entry.Dirty := true;
+ }
+
action(i_allocateTBE, "i", desc="Allocate TBE (number of invalidates=0)") {
check_allocate(TBEs);
assert(is_valid(cache_entry));
@@ -505,7 +517,13 @@ machine(L0Cache, "MESI Directory L0 Cache")
peek(messgeBuffer_in, CoherenceMsg) {
assert(is_valid(cache_entry));
cache_entry.DataBlk := in_msg.DataBlk;
- cache_entry.Dirty := in_msg.Dirty;
+ }
+ }
+
+ action(u_writeInstToCache, "ui", desc="Write data to cache") {
+ peek(messgeBuffer_in, CoherenceMsg) {
+ assert(is_valid(cache_entry));
+ cache_entry.DataBlk := in_msg.DataBlk;
}
}
@@ -560,16 +578,12 @@ machine(L0Cache, "MESI Directory L0 Cache")
//*****************************************************
// Transitions for Load/Store/Replacement/WriteBack from transient states
- transition({IS, IM, SM}, {Load, Ifetch, Store, L0_Replacement}) {
+ transition({Inst_IS, IS, IM, SM}, {Load, Ifetch, Store, L0_Replacement}) {
z_stallAndWaitMandatoryQueue;
}
// Transitions from Idle
- transition({NP,I}, L0_Replacement) {
- ff_deallocateCacheBlock;
- }
-
- transition({NP,I}, Load, IS) {
+ transition(I, Load, IS) {
oo_allocateDCacheBlock;
i_allocateTBE;
a_issueGETS;
@@ -577,7 +591,7 @@ machine(L0Cache, "MESI Directory L0 Cache")
k_popMandatoryQueue;
}
- transition({NP,I}, Ifetch, IS) {
+ transition(I, Ifetch, Inst_IS) {
pp_allocateICacheBlock;
i_allocateTBE;
a_issueGETS;
@@ -585,7 +599,7 @@ machine(L0Cache, "MESI Directory L0 Cache")
k_popMandatoryQueue;
}
- transition({NP,I}, Store, IM) {
+ transition(I, Store, IM) {
oo_allocateDCacheBlock;
i_allocateTBE;
b_issueGETX;
@@ -593,7 +607,7 @@ machine(L0Cache, "MESI Directory L0 Cache")
k_popMandatoryQueue;
}
- transition({NP, I, IS, IM}, Inv) {
+ transition({I, IS, IM, Inst_IS}, Inv) {
fi_sendInvAck;
l_popRequestQueue;
}
@@ -682,7 +696,7 @@ machine(L0Cache, "MESI Directory L0 Cache")
transition(IS, Data, S) {
u_writeDataToCache;
- h_load_hit;
+ hx_load_hit;
s_deallocateTBE;
o_popIncomingResponseQueue;
kd_wakeUpDependents;
@@ -690,15 +704,23 @@ machine(L0Cache, "MESI Directory L0 Cache")
transition(IS, Data_Exclusive, E) {
u_writeDataToCache;
- h_load_hit;
+ hx_load_hit;
s_deallocateTBE;
o_popIncomingResponseQueue;
kd_wakeUpDependents;
}
- transition(IS, Data_Stale, I) {
- u_writeDataToCache;
- h_load_hit;
+ transition(Inst_IS, Data, S) {
+ u_writeInstToCache;
+ hx_load_hit;
+ s_deallocateTBE;
+ o_popIncomingResponseQueue;
+ kd_wakeUpDependents;
+ }
+
+ transition(Inst_IS, Data_Exclusive, E) {
+ u_writeInstToCache;
+ hx_load_hit;
s_deallocateTBE;
o_popIncomingResponseQueue;
kd_wakeUpDependents;
@@ -706,7 +728,7 @@ machine(L0Cache, "MESI Directory L0 Cache")
transition({IM,SM}, Data_Exclusive, M) {
u_writeDataToCache;
- hh_store_hit;
+ hhx_store_hit;
s_deallocateTBE;
o_popIncomingResponseQueue;
kd_wakeUpDependents;
diff --git a/src/mem/protocol/MESI_Three_Level-L1cache.sm b/src/mem/protocol/MESI_Three_Level-L1cache.sm
index 7db3daede..737430765 100644
--- a/src/mem/protocol/MESI_Three_Level-L1cache.sm
+++ b/src/mem/protocol/MESI_Three_Level-L1cache.sm
@@ -59,7 +59,6 @@ machine(L1Cache, "MESI Directory L1 Cache CMP")
// STATES
state_declaration(State, desc="Cache states", default="L1Cache_State_I") {
// Base states
- NP, AccessPermission:Invalid, desc="Not present in either cache";
I, AccessPermission:Invalid, desc="a L1 cache entry Idle";
S, AccessPermission:Read_Only, desc="a L1 cache entry Shared";
SS, AccessPermission:Read_Only, desc="a L1 cache entry Shared";
@@ -72,8 +71,6 @@ machine(L1Cache, "MESI Directory L1 Cache CMP")
IS, AccessPermission:Busy, desc="L1 idle, issued GETS, have not seen response yet";
IM, AccessPermission:Busy, desc="L1 idle, issued GETX, have not seen response yet";
SM, AccessPermission:Read_Only, desc="L1 idle, issued GETX, have not seen response yet";
- IS_I, AccessPermission:Busy, desc="L1 idle, issued GETS, saw Inv before data because directory doesn't block on GETS hit";
-
M_I, AccessPermission:Busy, desc="L1 replacing, waiting for ACK";
SINK_WB_ACK, AccessPermission:Busy, desc="This is to sink WB_Acks from L2";
@@ -174,7 +171,7 @@ machine(L1Cache, "MESI Directory L1 Cache CMP")
} else if (is_valid(cache_entry)) {
return cache_entry.CacheState;
}
- return State:NP;
+ return State:I;
}
void setState(TBE tbe, Entry cache_entry, Address addr, State state) {
@@ -279,8 +276,7 @@ machine(L1Cache, "MESI Directory L1 Cache CMP")
if(in_msg.Type == CoherenceResponseType:DATA_EXCLUSIVE) {
trigger(Event:Data_Exclusive, in_msg.Addr, cache_entry, tbe);
} else if(in_msg.Type == CoherenceResponseType:DATA) {
- if ((getState(tbe, cache_entry, in_msg.Addr) == State:IS ||
- getState(tbe, cache_entry, in_msg.Addr) == State:IS_I) &&
+ if (getState(tbe, cache_entry, in_msg.Addr) == State:IS &&
machineIDToMachineType(in_msg.Sender) == MachineType:L1Cache) {
trigger(Event:DataS_fromL1, in_msg.Addr, cache_entry, tbe);
@@ -561,13 +557,13 @@ machine(L1Cache, "MESI Directory L1 Cache CMP")
assert(is_valid(cache_entry));
out_msg.Addr := address;
out_msg.Type := CoherenceRequestType:PUTX;
- out_msg.DataBlk := cache_entry.DataBlk;
out_msg.Dirty := cache_entry.Dirty;
out_msg.Requestor:= machineID;
out_msg.Destination.add(mapAddressToRange(address, MachineType:L2Cache,
l2_select_low_bit, l2_select_num_bits, clusterID));
if (cache_entry.Dirty) {
out_msg.MessageSize := MessageSizeType:Writeback_Data;
+ out_msg.DataBlk := cache_entry.DataBlk;
} else {
out_msg.MessageSize := MessageSizeType:Writeback_Control;
}
@@ -608,21 +604,6 @@ machine(L1Cache, "MESI Directory L1 Cache CMP")
out_msg.Sender := machineID;
out_msg.Dest := createMachineID(MachineType:L0Cache, version);
out_msg.DataBlk := cache_entry.DataBlk;
- out_msg.Dirty := cache_entry.Dirty;
- out_msg.MessageSize := MessageSizeType:Response_Data;
- }
- }
-
- action(h_stale_data_to_l0, "hs", desc="If not prefetch, send data to the L0 cache.") {
- enqueue(bufferToL0_out, CoherenceMsg, l1_response_latency) {
- assert(is_valid(cache_entry));
-
- out_msg.Addr := address;
- out_msg.Class := CoherenceClass:STALE_DATA;
- out_msg.Sender := machineID;
- out_msg.Dest := createMachineID(MachineType:L0Cache, version);
- out_msg.DataBlk := cache_entry.DataBlk;
- out_msg.Dirty := cache_entry.Dirty;
out_msg.MessageSize := MessageSizeType:Response_Data;
}
}
@@ -639,7 +620,7 @@ machine(L1Cache, "MESI Directory L1 Cache CMP")
out_msg.Dirty := cache_entry.Dirty;
out_msg.MessageSize := MessageSizeType:Response_Data;
- cache_entry.Dirty := true;
+ //cache_entry.Dirty := true;
}
}
@@ -674,8 +655,10 @@ machine(L1Cache, "MESI Directory L1 Cache CMP")
action(u_writeDataFromL0Request, "ureql0", desc="Write data to cache") {
peek(messageBufferFromL0_in, CoherenceMsg) {
assert(is_valid(cache_entry));
- cache_entry.DataBlk := in_msg.DataBlk;
- cache_entry.Dirty := in_msg.Dirty;
+ if (in_msg.Dirty) {
+ cache_entry.DataBlk := in_msg.DataBlk;
+ cache_entry.Dirty := in_msg.Dirty;
+ }
}
}
@@ -683,15 +666,16 @@ machine(L1Cache, "MESI Directory L1 Cache CMP")
peek(responseNetwork_in, ResponseMsg) {
assert(is_valid(cache_entry));
cache_entry.DataBlk := in_msg.DataBlk;
- cache_entry.Dirty := in_msg.Dirty;
}
}
action(u_writeDataFromL0Response, "uresl0", desc="Write data to cache") {
peek(messageBufferFromL0_in, CoherenceMsg) {
assert(is_valid(cache_entry));
- cache_entry.DataBlk := in_msg.DataBlk;
- cache_entry.Dirty := in_msg.Dirty;
+ if (in_msg.Dirty) {
+ cache_entry.DataBlk := in_msg.DataBlk;
+ cache_entry.Dirty := in_msg.Dirty;
+ }
}
}
@@ -745,17 +729,12 @@ machine(L1Cache, "MESI Directory L1 Cache CMP")
//*****************************************************
// Transitions for Load/Store/Replacement/WriteBack from transient states
- transition({IS, IM, IS_I, M_I, SM, SINK_WB_ACK, S_IL0, M_IL0, E_IL0, MM_IL0},
+ transition({IS, IM, M_I, SM, SINK_WB_ACK, S_IL0, M_IL0, E_IL0, MM_IL0},
{Load, Store, L1_Replacement}) {
z0_stallAndWaitL0Queue;
}
- // Transitions from Idle
- transition({NP,I}, L1_Replacement) {
- ff_deallocateCacheBlock;
- }
-
- transition({NP,I}, Load, IS) {
+ transition(I, Load, IS) {
oo_allocateCacheBlock;
i_allocateTBE;
a_issueGETS;
@@ -763,7 +742,7 @@ machine(L1Cache, "MESI Directory L1 Cache CMP")
k_popL0RequestQueue;
}
- transition({NP,I}, Store, IM) {
+ transition(I, Store, IM) {
oo_allocateCacheBlock;
i_allocateTBE;
b_issueGETX;
@@ -771,7 +750,7 @@ machine(L1Cache, "MESI Directory L1 Cache CMP")
k_popL0RequestQueue;
}
- transition({NP, I}, Inv) {
+ transition(I, Inv) {
fi_sendInvAck;
l_popL2RequestQueue;
}
@@ -869,6 +848,7 @@ machine(L1Cache, "MESI Directory L1 Cache CMP")
transition(M_I, WB_Ack, I) {
s_deallocateTBE;
o_popL2ResponseQueue;
+ ff_deallocateCacheBlock;
kd_wakeUpDependents;
}
@@ -885,6 +865,7 @@ machine(L1Cache, "MESI Directory L1 Cache CMP")
transition(MM, Fwd_GETX, I) {
d_sendDataToRequestor;
+ ff_deallocateCacheBlock;
l_popL2RequestQueue;
}
@@ -910,11 +891,6 @@ machine(L1Cache, "MESI Directory L1 Cache CMP")
}
// Transitions from IS
- transition({IS,IS_I}, Inv, IS_I) {
- fi_sendInvAck;
- l_popL2RequestQueue;
- }
-
transition(IS, Data_all_Acks, S) {
u_writeDataFromL2Response;
h_data_to_l0;
@@ -923,14 +899,6 @@ machine(L1Cache, "MESI Directory L1 Cache CMP")
kd_wakeUpDependents;
}
- transition(IS_I, Data_all_Acks, I) {
- u_writeDataFromL2Response;
- h_stale_data_to_l0;
- s_deallocateTBE;
- o_popL2ResponseQueue;
- kd_wakeUpDependents;
- }
-
transition(IS, DataS_fromL1, S) {
u_writeDataFromL2Response;
j_sendUnblock;
@@ -940,15 +908,6 @@ machine(L1Cache, "MESI Directory L1 Cache CMP")
kd_wakeUpDependents;
}
- transition(IS_I, DataS_fromL1, I) {
- u_writeDataFromL2Response;
- j_sendUnblock;
- h_stale_data_to_l0;
- s_deallocateTBE;
- o_popL2ResponseQueue;
- kd_wakeUpDependents;
- }
-
// directory is blocked when sending exclusive data
transition(IS, Data_Exclusive, E) {
u_writeDataFromL2Response;
@@ -959,16 +918,6 @@ machine(L1Cache, "MESI Directory L1 Cache CMP")
kd_wakeUpDependents;
}
- // directory is blocked when sending exclusive data
- transition(IS_I, Data_Exclusive, E) {
- u_writeDataFromL2Response;
- hh_xdata_to_l0;
- jj_sendExclusiveUnblock;
- s_deallocateTBE;
- o_popL2ResponseQueue;
- kd_wakeUpDependents;
- }
-
// Transitions from IM
transition({IM,SM}, Inv, IM) {
fi_sendInvAck;
@@ -1015,6 +964,7 @@ machine(L1Cache, "MESI Directory L1 Cache CMP")
transition(SINK_WB_ACK, WB_Ack, I){
s_deallocateTBE;
o_popL2ResponseQueue;
+ ff_deallocateCacheBlock;
kd_wakeUpDependents;
}
@@ -1058,7 +1008,7 @@ machine(L1Cache, "MESI Directory L1 Cache CMP")
z2_stallAndWaitL2Queue;
}
- transition({S_IL0, M_IL0, E_IL0, MM_IL0}, {Inv, Fwd_GETX, Fwd_GETS}) {
+ transition({IS, S_IL0, M_IL0, E_IL0, MM_IL0}, {Inv, Fwd_GETX, Fwd_GETS}) {
z2_stallAndWaitL2Queue;
}
}
diff --git a/src/mem/protocol/MESI_Three_Level-msg.sm b/src/mem/protocol/MESI_Three_Level-msg.sm
index 968d26964..1769995a0 100644
--- a/src/mem/protocol/MESI_Three_Level-msg.sm
+++ b/src/mem/protocol/MESI_Three_Level-msg.sm
@@ -46,11 +46,6 @@ enumeration(CoherenceClass, desc="...") {
DATA, desc="Data block for L1 cache in S state";
DATA_EXCLUSIVE, desc="Data block for L1 cache in M/E state";
ACK, desc="Generic invalidate ack";
-
- // This is a special case in which the L1 cache lost permissions to the
- // shared block before it got the data. So the L0 cache can use the data
- // but not store it.
- STALE_DATA;
}
// Class for messages sent between the L0 and the L1 controllers.
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-25 23:49:19 +0000