[edk2-devel] [PATCH v5] UefiCpuPkg/PiSmmCpuDxeSmm: Avoid allocate Token every time
Ni, Ray
ray.ni at intel.com
Thu Dec 5 07:43:47 UTC 2019
Reviewed-by: Ray Ni <ray.ni at intel.com>
> -----Original Message-----
> From: Dong, Eric <eric.dong at intel.com>
> Sent: Thursday, December 5, 2019 3:08 PM
> To: devel at edk2.groups.io
> Cc: Ni, Ray <ray.ni at intel.com>; Laszlo Ersek <lersek at redhat.com>
> Subject: [PATCH v5] UefiCpuPkg/PiSmmCpuDxeSmm: Avoid allocate Token
> every time
>
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2388
>
> Token is new introduced by MM MP Protocol. 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.dong at intel.com>
> Cc: Ray Ni <ray.ni at intel.com>
> Cc: Laszlo Ersek <lersek at redhat.com>
> ---
>
> V5 changes:
>
> Refine PCD names and some code comments.
>
> V4 changes:
>
> Specify PCD type to FixedPcd in code.
>
> V3 changes:
>
> Introduce PCD to control the pre allocated toke buffer size.
>
> v2 changes:
>
> Minor update based on comments.
>
>
> UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c | 67
> ++++++++++++++++++--
> UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h | 15 +++++
> UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf | 3 +
> UefiCpuPkg/UefiCpuPkg.dec | 4 ++
> UefiCpuPkg/UefiCpuPkg.uni | 3 +
> 5 files changed, 88 insertions(+), 4 deletions(-)
>
> diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
> b/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
> index 0685637c2b..757f1056f7 100644
> --- a/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
> +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
> @@ -492,6 +492,24 @@ FreeTokens (
> {
>
> LIST_ENTRY *Link;
>
> PROCEDURE_TOKEN *ProcToken;
>
> + TOKEN_BUFFER *TokenBuf;
>
> +
>
> + //
>
> + // Only free the token buffer recorded in the OldTOkenBufList
>
> + // upon exiting SMI. Current token buffer stays allocated so
>
> + // next SMI doesn't need to re-allocate.
>
> + //
>
> + 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 +517,6 @@ FreeTokens (
>
>
> RemoveEntryList (&ProcToken->Link);
>
>
>
> - FreePool ((VOID *)ProcToken->ProcedureToken);
>
> FreePool (ProcToken);
>
> }
>
> }
>
> @@ -1115,13 +1132,37 @@ CreateToken (
> VOID
>
> )
>
> {
>
> - PROCEDURE_TOKEN *ProcToken;
>
> + PROCEDURE_TOKEN *ProcToken;
>
> SPIN_LOCK *CpuToken;
>
> UINTN SpinLockSize;
>
> + TOKEN_BUFFER *TokenBuf;
>
> + UINT32 TokenCountPerChunk;
>
>
>
> SpinLockSize = GetSpinLockProperties ();
>
> - CpuToken = AllocatePool (SpinLockSize);
>
> - ASSERT (CpuToken != NULL);
>
> + TokenCountPerChunk = FixedPcdGet32
> (PcdCpuSmmMpTokenCountPerChunk);
>
> +
>
> + if (gSmmCpuPrivate->UsedTokenNum == TokenCountPerChunk) {
>
> + DEBUG ((DEBUG_VERBOSE, "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 = AllocatePool (SpinLockSize *
> TokenCountPerChunk);
>
> + ASSERT (gSmmCpuPrivate->CurrentTokenBuf != NULL);
>
> + gSmmCpuPrivate->UsedTokenNum = 0;
>
> + }
>
> +
>
> + CpuToken = (SPIN_LOCK *)(gSmmCpuPrivate->CurrentTokenBuf +
> SpinLockSize * gSmmCpuPrivate->UsedTokenNum);
>
> + gSmmCpuPrivate->UsedTokenNum++;
>
> +
>
> InitializeSpinLock (CpuToken);
>
> AcquireSpinLock (CpuToken);
>
>
>
> @@ -1732,10 +1773,28 @@ InitializeDataForMmMp (
> VOID
>
> )
>
> {
>
> + UINTN SpinLockSize;
>
> + UINT32 TokenCountPerChunk;
>
> +
>
> + SpinLockSize = GetSpinLockProperties ();
>
> + TokenCountPerChunk = FixedPcdGet32
> (PcdCpuSmmMpTokenCountPerChunk);
>
> + ASSERT (TokenCountPerChunk != 0);
>
> + if (TokenCountPerChunk == 0) {
>
> + DEBUG ((DEBUG_ERROR, "PcdCpuSmmMpTokenCountPerChunk should
> not be Zero!\n"));
>
> + CpuDeadLoop ();
>
> + }
>
> + DEBUG ((DEBUG_INFO, "CpuSmm: SpinLock Size = 0x%x,
> PcdCpuSmmMpTokenCountPerChunk = 0x%x\n", SpinLockSize,
> TokenCountPerChunk));
>
> +
>
> + gSmmCpuPrivate->CurrentTokenBuf = AllocatePool (SpinLockSize *
> TokenCountPerChunk);
>
> + 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 7e7c73f27f..5c1a01e42b 100644
> --- a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h
> +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h
> @@ -217,6 +217,17 @@ 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 +254,10 @@ typedef struct {
> PROCEDURE_WRAPPER *ApWrapperFunc;
>
> LIST_ENTRY TokenList;
>
>
>
> + LIST_ENTRY OldTokenBufList;
>
> +
>
> + UINT8 *CurrentTokenBuf;
>
> + UINT32 UsedTokenNum; // Only record tokens used in
> CurrentTokenBuf.
>
> } SMM_CPU_PRIVATE_DATA;
>
>
>
> extern SMM_CPU_PRIVATE_DATA *gSmmCpuPrivate;
>
> diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf
> b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf
> index b12b2691f8..76b1462996 100644
> --- a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf
> +++ b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf
> @@ -140,6 +140,9 @@
> gEfiMdeModulePkgTokenSpaceGuid.PcdHeapGuardPropertyMask
> ## CONSUMES
>
> gEfiMdePkgTokenSpaceGuid.PcdControlFlowEnforcementPropertyMask
> ## CONSUMES
>
>
>
> +[FixedPcd]
>
> + gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmMpTokenCountPerChunk
> ## CONSUMES
>
> +
>
> [Pcd.X64]
>
> gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmRestrictedMemoryAccess ##
> CONSUMES
>
>
>
> diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec
> index 12f4413ea5..797f948631 100644
> --- a/UefiCpuPkg/UefiCpuPkg.dec
> +++ b/UefiCpuPkg/UefiCpuPkg.dec
> @@ -148,6 +148,10 @@
> # @Prompt Specify size of good stack of exception which need switching
> stack.
>
>
> gUefiCpuPkgTokenSpaceGuid.PcdCpuKnownGoodStackSize|2048|UINT32|0
> x30002001
>
>
>
> + ## Count of pre allocated SMM MP tokens per chunk.
>
> + # @Prompt Specify the count of pre allocated SMM MP tokens per chunk.
>
> +
> gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmMpTokenCountPerChunk|64|UI
> NT32|0x30002002
>
> +
>
> [PcdsFixedAtBuild, PcdsPatchableInModule]
>
> ## This value is the CPU Local APIC base address, which aligns the address
> on a 4-KByte boundary.
>
> # @Prompt Configure base address of CPU Local APIC
>
> diff --git a/UefiCpuPkg/UefiCpuPkg.uni b/UefiCpuPkg/UefiCpuPkg.uni
> index bfd696f48c..442ce5cb85 100644
> --- a/UefiCpuPkg/UefiCpuPkg.uni
> +++ b/UefiCpuPkg/UefiCpuPkg.uni
> @@ -272,3 +272,6 @@
> "24000000 - 6th and 7th
> generation Intel Core processors and Intel Xeon W Processor
> Family(24MHz).<BR>\n"
>
> "19200000 - Intel Atom
> processors based on Goldmont Microarchitecture with CPUID signature
> 06_5CH(19.2MHz).<BR>\n"
>
>
>
> +#string
> STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuSmmMpTokenCountPerChunk_P
> ROMPT #language en-US "Specify the count of pre allocated SMM MP
> tokens per chunk.\n"
>
> +
>
> +#string
> STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuSmmMpTokenCountPerChunk_H
> ELP #language en-US "This value used to specify the count of pre allocated
> SMM MP tokens per chunk.\n"
> \ No newline at end of file
> --
> 2.23.0.windows.1
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