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MdeMoudlePkg/CapsulePei: Optimize GetScatterGatherHeadEntries 

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1853

Rename the MACRO from MAX_SG_LIST_HEADS to DEFAULT_SG_LIST_HEADS.
GetScatterGatherHeadEntries: use allocated buffer instead of fixed
array to handle the condition which the SG list is larger then the
array size.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Sean Brogan <sean.brogan@microsoft.com>
Cc: Michael Turner <Michael.Turner@microsoft.com>
Cc: Bret Barkelew <Bret.Barkelew@microsoft.com>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Signed-off-by: Zhichao gao <zhichao.gao@intel.com>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>
This commit is contained in:
Zhichao Gao 2019-06-10 09:52:22 +08:00 committed by Hao A Wu
parent f654a18b66
commit d96f83de5e
1 changed files with 37 additions and 14 deletions
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51
MdeModulePkg/Universal/CapsulePei/UefiCapsule.c
View File

@ -10,6 +10,8 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
#include "Capsule.h"
#define DEFAULT_SG_LIST_HEADS (20)
#ifdef MDE_CPU_IA32
//
// Global Descriptor Table (GDT)
@ -841,8 +843,6 @@ AreCapsulesStaged (
return FALSE;
}
#define MAX_SG_LIST_HEADS (20)
/**
Check all the variables for SG list heads and get the count and addresses.
@ -861,17 +861,19 @@ GetScatterGatherHeadEntries (
OUT EFI_PHYSICAL_ADDRESS **HeadList
)
{
EFI_STATUS Status;
UINTN Size;
UINTN Index;
UINTN TempIndex;
UINTN ValidIndex;
BOOLEAN Flag;
CHAR16 CapsuleVarName[30];
CHAR16 *TempVarName;
EFI_PHYSICAL_ADDRESS CapsuleDataPtr64;
EFI_PEI_READ_ONLY_VARIABLE2_PPI *PPIVariableServices;
EFI_PHYSICAL_ADDRESS TempList[MAX_SG_LIST_HEADS];
EFI_STATUS Status;
UINTN Size;
UINTN Index;
UINTN TempIndex;
UINTN ValidIndex;
BOOLEAN Flag;
CHAR16 CapsuleVarName[30];
CHAR16 *TempVarName;
EFI_PHYSICAL_ADDRESS CapsuleDataPtr64;
EFI_PEI_READ_ONLY_VARIABLE2_PPI *PPIVariableServices;
EFI_PHYSICAL_ADDRESS *TempList;
EFI_PHYSICAL_ADDRESS *EnlargedTempList;
UINTN TempListLength;
Index = 0;
TempVarName = NULL;
@ -901,12 +903,22 @@ GetScatterGatherHeadEntries (
return Status;
}
//
// Allocate memory for sg list head
//
TempListLength = DEFAULT_SG_LIST_HEADS * sizeof (EFI_PHYSICAL_ADDRESS);
TempList = AllocateZeroPool (TempListLength);
if (TempList == NULL) {
DEBUG((DEBUG_ERROR, "Failed to allocate memory\n"));
return EFI_OUT_OF_RESOURCES;
}
//
// setup var name buffer for update capsules
//
StrCpyS (CapsuleVarName, sizeof (CapsuleVarName) / sizeof (CHAR16), EFI_CAPSULE_VARIABLE_NAME);
TempVarName = CapsuleVarName + StrLen (CapsuleVarName);
while (ValidIndex < MAX_SG_LIST_HEADS) {
while (TRUE) {
if (Index != 0) {
UnicodeValueToStringS (
TempVarName,
@ -948,6 +960,17 @@ GetScatterGatherHeadEntries (
continue;
}
//
// The TempList is full, enlarge it
//
if ((ValidIndex + 1) >= TempListLength) {
EnlargedTempList = AllocateZeroPool (TempListLength * 2);
CopyMem (EnlargedTempList, TempList, TempListLength);
FreePool (TempList);
TempList = EnlargedTempList;
TempListLength *= 2;
}
//
// add it to the cached list
//