Re: [edk2-devel] [PATCH v2] UefiCpuPkg/PiSmmCpuDxeSmm: Avoid allocate Token every time.

["Ni, Ray" <ray.ni@intel.com>]

Reviewed-by: Ray Ni <ray.ni@intel.com>

> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Dong,
> Eric
> Sent: Thursday, November 28, 2019 2:17 PM
> To: devel@edk2.groups.io
> Cc: Ni, Ray <ray.ni@intel.com>; Laszlo Ersek <lersek@redhat.com>
> Subject: [edk2-devel] [PATCH v2] UefiCpuPkg/PiSmmCpuDxeSmm: Avoid
> allocate Token every time.
> 
> v2 changes:
> 
>   Minor update based on comments.
> 
> 
> 
> v1 changes:
> 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.dong@intel.com>
> Cc: Ray Ni <ray.ni@intel.com>
> Cc: Laszlo Ersek <lersek@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.
> 
> +  //
> 
> +  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;
> 
> --
> 2.23.0.windows.1
> 
> 
> -=-=-=-=-=-=
> Groups.io Links: You receive all messages sent to this group.
> 
> View/Reply Online (#51442): https://edk2.groups.io/g/devel/message/51442
> Mute This Topic: https://groups.io/mt/63850169/1712937
> Group Owner: devel+owner@edk2.groups.io
> Unsubscribe: https://edk2.groups.io/g/devel/unsub  [ray.ni@intel.com]
> -=-=-=-=-=-=