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MOESI_hammer: fixed L2 to L1 infinite stalls and deadlock

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--HG--
extra : rebase_source : 90f217f28e195a8cee5d64b25c913b452d818676
This commit is contained in:
Brad Beckmann 2011-12-01 10:08:52 -08:00
parent cecbdb6d79
commit 8daad28a90
1 changed files with 46 additions and 20 deletions
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66
src/mem/protocol/MOESI_hammer-cache.sm
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@ -62,6 +62,13 @@ machine(L1Cache, "AMD Hammer-like protocol")
M, AccessPermission:Read_Only, desc="Modified (dirty)";
MM, AccessPermission:Read_Write, desc="Modified (dirty and locally modified)";
// Base states, locked and ready to service the mandatory queue
IR, AccessPermission:Invalid, desc="Idle";
SR, AccessPermission:Read_Only, desc="Shared";
OR, AccessPermission:Read_Only, desc="Owned";
MR, AccessPermission:Read_Only, desc="Modified (dirty)";
MMR, AccessPermission:Read_Write, desc="Modified (dirty and locally modified)";
// Transient States
IM, AccessPermission:Busy, "IM", desc="Issued GetX";
SM, AccessPermission:Read_Only, "SM", desc="Issued GetX, we still have a valid copy of the line";
@ -1217,6 +1224,11 @@ machine(L1Cache, "AMD Hammer-like protocol")
stall_and_wait(mandatoryQueue_in, address);
}
action(z_stall, "z", desc="stall") {
// do nothing and the special z_stall action will return a protocol stall
// so that the next port is checked
}
action(kd_wakeUpDependents, "kd", desc="wake-up dependents") {
wakeUpBuffers(address);
}
@ -1246,7 +1258,7 @@ machine(L1Cache, "AMD Hammer-like protocol")
zz_stallAndWaitMandatoryQueue;
}
transition({IM, SM, ISM, OM, IS, SS, MM_W, M_W, OI, MI, II, IT, ST, OT, MT, MMT, IM_F, SM_F, ISM_F, OM_F, MM_WF, MI_F, MM_F}, L1_to_L2) {
transition({IM, SM, ISM, OM, IS, SS, MM_W, M_W, OI, MI, II, IT, ST, OT, MT, MMT, IM_F, SM_F, ISM_F, OM_F, MM_WF, MI_F, MM_F, IR, SR, OR, MR, MMR}, L1_to_L2) {
zz_stallAndWaitMandatoryQueue;
}
@ -1259,7 +1271,11 @@ machine(L1Cache, "AMD Hammer-like protocol")
}
transition({IT, ST, OT, MT, MMT}, {Other_GETX, NC_DMA_GETS, Other_GETS, Merged_GETS, Other_GETS_No_Mig, Invalidate, Flush_line}) {
// stall
z_stall;
}
transition({IR, SR, OR, MR, MMR}, {Other_GETX, NC_DMA_GETS, Other_GETS, Merged_GETS, Other_GETS_No_Mig, Invalidate}) {
z_stall;
}
// Transitions moving data between the L1 and L2 caches
@ -1382,33 +1398,33 @@ machine(L1Cache, "AMD Hammer-like protocol")
ll_L2toL1Transfer;
}
transition(IT, Complete_L2_to_L1, I) {
transition(IT, Complete_L2_to_L1, IR) {
j_popTriggerQueue;
kd_wakeUpDependents;
}
transition(ST, Complete_L2_to_L1, S) {
transition(ST, Complete_L2_to_L1, SR) {
j_popTriggerQueue;
kd_wakeUpDependents;
}
transition(OT, Complete_L2_to_L1, O) {
transition(OT, Complete_L2_to_L1, OR) {
j_popTriggerQueue;
kd_wakeUpDependents;
}
transition(MT, Complete_L2_to_L1, M) {
transition(MT, Complete_L2_to_L1, MR) {
j_popTriggerQueue;
kd_wakeUpDependents;
}
transition(MMT, Complete_L2_to_L1, MM) {
transition(MMT, Complete_L2_to_L1, MMR) {
j_popTriggerQueue;
kd_wakeUpDependents;
}
// Transitions from Idle
transition(I, Load, IS) {
transition({I, IR}, Load, IS) {
ii_allocateL1DCacheBlock;
i_allocateTBE;
a_issueGETS;
@ -1416,7 +1432,7 @@ machine(L1Cache, "AMD Hammer-like protocol")
k_popMandatoryQueue;
}
transition(I, Ifetch, IS) {
transition({I, IR}, Ifetch, IS) {
jj_allocateL1ICacheBlock;
i_allocateTBE;
a_issueGETS;
@ -1424,7 +1440,7 @@ machine(L1Cache, "AMD Hammer-like protocol")
k_popMandatoryQueue;
}
transition(I, Store, IM) {
transition({I, IR}, Store, IM) {
ii_allocateL1DCacheBlock;
i_allocateTBE;
b_issueGETX;
@ -1432,7 +1448,7 @@ machine(L1Cache, "AMD Hammer-like protocol")
k_popMandatoryQueue;
}
transition(I, Flush_line, IM_F) {
transition({I, IR}, Flush_line, IM_F) {
it_allocateTBE;
bf_issueGETF;
uu_profileMiss;
@ -1455,14 +1471,19 @@ machine(L1Cache, "AMD Hammer-like protocol")
k_popMandatoryQueue;
}
transition(S, Store, SM) {
transition(SR, {Load, Ifetch}, S) {
h_load_hit;
k_popMandatoryQueue;
}
transition({S, SR}, Store, SM) {
i_allocateTBE;
b_issueGETX;
uu_profileMiss;
k_popMandatoryQueue;
}
transition(S, Flush_line, SM_F) {
transition({S, SR}, Flush_line, SM_F) {
i_allocateTBE;
bf_issueGETF;
uu_profileMiss;
@ -1491,14 +1512,19 @@ machine(L1Cache, "AMD Hammer-like protocol")
k_popMandatoryQueue;
}
transition(O, Store, OM) {
transition(OR, {Load, Ifetch}, O) {
h_load_hit;
k_popMandatoryQueue;
}
transition({O, OR}, Store, OM) {
i_allocateTBE;
b_issueGETX;
p_decrementNumberOfMessagesByOne;
uu_profileMiss;
k_popMandatoryQueue;
}
transition(O, Flush_line, OM_F) {
transition({O, OR}, Flush_line, OM_F) {
i_allocateTBE;
bf_issueGETF;
p_decrementNumberOfMessagesByOne;
@ -1530,17 +1556,17 @@ machine(L1Cache, "AMD Hammer-like protocol")
}
// Transitions from Modified
transition(MM, {Load, Ifetch}) {
transition({MM, MMR}, {Load, Ifetch}, MM) {
h_load_hit;
k_popMandatoryQueue;
}
transition(MM, Store) {
transition({MM, MMR}, Store, MM) {
hh_store_hit;
k_popMandatoryQueue;
}
transition({MM, M}, Flush_line, MM_F) {
transition({MM, M, MMR}, Flush_line, MM_F) {
i_allocateTBE;
bf_issueGETF;
p_decrementNumberOfMessagesByOne;
@ -1587,12 +1613,12 @@ machine(L1Cache, "AMD Hammer-like protocol")
}
// Transitions from Dirty Exclusive
transition(M, {Load, Ifetch}) {
transition({M, MR}, {Load, Ifetch}, M) {
h_load_hit;
k_popMandatoryQueue;
}
transition(M, Store, MM) {
transition({M, MR}, Store, MM) {
hh_store_hit;
k_popMandatoryQueue;
}