Hi Eric,
On 11/28/19 7:17 AM, Dong, Eric via Groups.Io wrote:
v2 changes:
Minor update based on comments.
v1 changes:
Nitpick, previous comments should not go into the commit description,
either on a cover letter, or after the '---' marker so they get stripped
out by git-am.
Another nitpick, remove the trailing dot in commit subject.
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2388
Current logic allocate Token every time when need to use it. The logic
caused SMI latency raised to very high. Update logic to allocate Token
buffer at driver's entry point. Later use the token from the allocated
token buffer. Only when all the buffer have been used, then need to
allocate new buffer.
Signed-off-by: Eric Dong <eric.d...@intel.com>
Cc: Ray Ni <ray...@intel.com>
Cc: Laszlo Ersek <ler...@redhat.com>
---
UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c | 56 ++++++++++++++++++++--
UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h | 16 +++++++
2 files changed, 68 insertions(+), 4 deletions(-)
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
b/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
index d8d2b6f444..4632e5b0c2 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
@@ -492,6 +492,23 @@ FreeTokens (
{
LIST_ENTRY *Link;
PROCEDURE_TOKEN *ProcToken;
+ TOKEN_BUFFER *TokenBuf;
+
+ //
+ // Not free the buffer, just clear the UsedTokenNum. In order to
+ // avoid later trig allcate action again when need to use token.
Maybe: "In order to avoid triggering allocate action when we need to use
the token, do not free the buffer."
Patch looks good otherwise.
+ //
+ gSmmCpuPrivate->UsedTokenNum = 0;
+
+ Link = GetFirstNode (&gSmmCpuPrivate->OldTokenBufList);
+ while (!IsNull (&gSmmCpuPrivate->OldTokenBufList, Link)) {
+ TokenBuf = TOKEN_BUFFER_FROM_LINK (Link);
+
+ Link = RemoveEntryList (&TokenBuf->Link);
+
+ FreePool (TokenBuf->Buffer);
+ FreePool (TokenBuf);
+ }
while (!IsListEmpty (&gSmmCpuPrivate->TokenList)) {
Link = GetFirstNode (&gSmmCpuPrivate->TokenList);
@@ -499,7 +516,6 @@ FreeTokens (
RemoveEntryList (&ProcToken->Link);
- FreePool ((VOID *)ProcToken->ProcedureToken);
FreePool (ProcToken);
}
}
@@ -1115,13 +1131,35 @@ CreateToken (
VOID
)
{
- PROCEDURE_TOKEN *ProcToken;
+ PROCEDURE_TOKEN *ProcToken;
SPIN_LOCK *CpuToken;
UINTN SpinLockSize;
+ TOKEN_BUFFER *TokenBuf;
SpinLockSize = GetSpinLockProperties ();
- CpuToken = AllocatePool (SpinLockSize);
- ASSERT (CpuToken != NULL);
+
+ if (gSmmCpuPrivate->UsedTokenNum == MAX_PRE_RESERVE_TOKEN_COUNT) {
+ DEBUG((DEBUG_INFO, "CpuSmm: No free token buffer, allocate new
buffer!\n"));
+
+ //
+ // Record current token buffer for later free action usage.
+ // Current used token buffer not in this list.
+ //
+ TokenBuf = AllocatePool (sizeof (TOKEN_BUFFER));
+ ASSERT (TokenBuf != NULL);
+ TokenBuf->Signature = TOKEN_BUFFER_SIGNATURE;
+ TokenBuf->Buffer = gSmmCpuPrivate->CurrentTokenBuf;
+
+ InsertTailList (&gSmmCpuPrivate->OldTokenBufList, &TokenBuf->Link);
+
+ gSmmCpuPrivate->CurrentTokenBuf = AllocateZeroPool (SpinLockSize *
MAX_PRE_RESERVE_TOKEN_COUNT);
+ ASSERT (gSmmCpuPrivate->CurrentTokenBuf != NULL);
+ gSmmCpuPrivate->UsedTokenNum = 0;
+ }
+
+ CpuToken = (SPIN_LOCK *)(gSmmCpuPrivate->CurrentTokenBuf + SpinLockSize *
gSmmCpuPrivate->UsedTokenNum);
+ gSmmCpuPrivate->UsedTokenNum++;
+
InitializeSpinLock (CpuToken);
AcquireSpinLock (CpuToken);
@@ -1737,10 +1775,20 @@ InitializeDataForMmMp (
VOID
)
{
+ UINTN SpinLockSize;
+
+ SpinLockSize = GetSpinLockProperties ();
+ DEBUG((DEBUG_INFO, "CpuSmm: SpinLock Size = 0x%x\n", SpinLockSize));
+
+ gSmmCpuPrivate->CurrentTokenBuf = AllocateZeroPool (SpinLockSize *
MAX_PRE_RESERVE_TOKEN_COUNT);
+ ASSERT (gSmmCpuPrivate->CurrentTokenBuf != NULL);
+ gSmmCpuPrivate->UsedTokenNum = 0;
+
gSmmCpuPrivate->ApWrapperFunc = AllocatePool (sizeof (PROCEDURE_WRAPPER) *
gSmmCpuPrivate->SmmCoreEntryContext.NumberOfCpus);
ASSERT (gSmmCpuPrivate->ApWrapperFunc != NULL);
InitializeListHead (&gSmmCpuPrivate->TokenList);
+ InitializeListHead (&gSmmCpuPrivate->OldTokenBufList);
}
/**
diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h
b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h
index 8c29f1a558..36fd0dae92 100644
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h
@@ -198,6 +198,7 @@ typedef UINT32
SMM_CPU_ARRIVAL_EXCEPTIONS;
#define ARRIVAL_EXCEPTION_DELAYED 0x2
#define ARRIVAL_EXCEPTION_SMI_DISABLED 0x4
+#define MAX_PRE_RESERVE_TOKEN_COUNT 0x512
//
// Wrapper used to convert EFI_AP_PROCEDURE2 and EFI_AP_PROCEDURE.
//
@@ -217,6 +218,17 @@ typedef struct {
#define PROCEDURE_TOKEN_FROM_LINK(a) CR (a, PROCEDURE_TOKEN, Link, PROCEDURE_TOKEN_SIGNATURE)
+#define TOKEN_BUFFER_SIGNATURE SIGNATURE_32 ('T', 'K', 'B', 'S')
+
+typedef struct {
+ UINTN Signature;
+ LIST_ENTRY Link;
+
+ UINT8 *Buffer;
+} TOKEN_BUFFER;
+
+#define TOKEN_BUFFER_FROM_LINK(a) CR (a, TOKEN_BUFFER, Link,
TOKEN_BUFFER_SIGNATURE)
+
//
// Private structure for the SMM CPU module that is stored in DXE Runtime
memory
// Contains the SMM Configuration Protocols that is produced.
@@ -243,6 +255,10 @@ typedef struct {
PROCEDURE_WRAPPER *ApWrapperFunc;
LIST_ENTRY TokenList;
+ LIST_ENTRY OldTokenBufList;
+
+ UINT8 *CurrentTokenBuf;
+ UINTN UsedTokenNum; // Only record tokens used
in CurrentTokenBuf.
} SMM_CPU_PRIVATE_DATA;
extern SMM_CPU_PRIVATE_DATA *gSmmCpuPrivate;
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