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Merge pull request #12282 from Wack0/mmu-tlb-patch 

MMU: Use VSID in segment register as additional TLB lookup key
This commit is contained in:
Tilka 2023-11-12 19:41:23 +00:00 committed by GitHub
parent 15a3200b70 2333fc2701
commit 4b38560323
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 13 additions and 11 deletions
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21
Source/Core/Core/PowerPC/MMU.cpp
View File

@ -1330,13 +1330,13 @@ enum class TLBLookupResult
};
static TLBLookupResult LookupTLBPageAddress(PowerPC::PowerPCState& ppc_state,
const XCheckTLBFlag flag, const u32 vpa, u32* paddr,
bool* wi)
const XCheckTLBFlag flag, const u32 vpa, const u32 vsid,
u32* paddr, bool* wi)
{
const u32 tag = vpa >> HW_PAGE_INDEX_SHIFT;
TLBEntry& tlbe = ppc_state.tlb[IsOpcodeFlag(flag)][tag & HW_PAGE_INDEX_MASK];
if (tlbe.tag[0] == tag)
if (tlbe.tag[0] == tag && tlbe.vsid[0] == vsid)
{
UPTE_Hi pte2(tlbe.pte[0]);
@ -1359,7 +1359,7 @@ static TLBLookupResult LookupTLBPageAddress(PowerPC::PowerPCState& ppc_state,
return TLBLookupResult::Found;
}
if (tlbe.tag[1] == tag)
if (tlbe.tag[1] == tag && tlbe.vsid[1] == vsid)
{
UPTE_Hi pte2(tlbe.pte[1]);
@ -1386,7 +1386,7 @@ static TLBLookupResult LookupTLBPageAddress(PowerPC::PowerPCState& ppc_state,
}
static void UpdateTLBEntry(PowerPC::PowerPCState& ppc_state, const XCheckTLBFlag flag, UPTE_Hi pte2,
const u32 address)
const u32 address, const u32 vsid)
{
if (IsNoExceptionFlag(flag))
return;
@ -1398,6 +1398,7 @@ static void UpdateTLBEntry(PowerPC::PowerPCState& ppc_state, const XCheckTLBFlag
tlbe.paddr[index] = pte2.RPN << HW_PAGE_INDEX_SHIFT;
tlbe.pte[index] = pte2.Hex;
tlbe.tag[index] = tag;
tlbe.vsid[index] = vsid;
}
void MMU::InvalidateTLBEntry(u32 address)
@ -1412,20 +1413,21 @@ void MMU::InvalidateTLBEntry(u32 address)
template <const XCheckTLBFlag flag>
MMU::TranslateAddressResult MMU::TranslatePageAddress(const EffectiveAddress address, bool* wi)
{
const auto sr = UReg_SR{m_ppc_state.sr[address.SR]};
const u32 VSID = sr.VSID; // 24 bit
// TLB cache
// This catches 99%+ of lookups in practice, so the actual page table entry code below doesn't
// benefit much from optimization.
u32 translated_address = 0;
const TLBLookupResult res =
LookupTLBPageAddress(m_ppc_state, flag, address.Hex, &translated_address, wi);
LookupTLBPageAddress(m_ppc_state, flag, address.Hex, VSID, &translated_address, wi);
if (res == TLBLookupResult::Found)
{
return TranslateAddressResult{TranslateAddressResultEnum::PAGE_TABLE_TRANSLATED,
translated_address};
}
const auto sr = UReg_SR{m_ppc_state.sr[address.SR]};
if (sr.T != 0)
return TranslateAddressResult{TranslateAddressResultEnum::DIRECT_STORE_SEGMENT, 0};
@ -1439,7 +1441,6 @@ MMU::TranslateAddressResult MMU::TranslatePageAddress(const EffectiveAddress add
const u32 offset = address.offset; // 12 bit
const u32 page_index = address.page_index; // 16 bit
const u32 VSID = sr.VSID; // 24 bit
const u32 api = address.API; // 6 bit (part of page_index)
// hash function no 1 "xor" .360
@ -1494,7 +1495,7 @@ MMU::TranslateAddressResult MMU::TranslatePageAddress(const EffectiveAddress add
// We already updated the TLB entry if this was caused by a C bit.
if (res != TLBLookupResult::UpdateC)
UpdateTLBEntry(m_ppc_state, flag, pte2, address.Hex);
UpdateTLBEntry(m_ppc_state, flag, pte2, address.Hex, VSID);
*wi = (pte2.WIMG & 0b1100) != 0;

1
Source/Core/Core/PowerPC/PowerPC.h
View File

@ -62,6 +62,7 @@ struct TLBEntry
WayArray tag{INVALID_TAG, INVALID_TAG};
WayArray paddr{};
WayArray vsid{};
WayArray pte{};
u32 recent = 0;

2
Source/Core/Core/State.cpp
View File

@ -93,7 +93,7 @@ static size_t s_state_writes_in_queue;
static std::condition_variable s_state_write_queue_is_empty;
// Don't forget to increase this after doing changes on the savestate system
constexpr u32 STATE_VERSION = 163; // Last changed in PR 12217
constexpr u32 STATE_VERSION = 164; // Last changed in PR 12282
// Increase this if the StateExtendedHeader definition changes
constexpr u32 EXTENDED_HEADER_VERSION = 1; // Last changed in PR 12217