EdkModulePkg/Library/EdkPeiPerformanceLib/PeiPerformanceLib.c

   1 /*++
   2
   3 Copyright (c) 2006, Intel Corporation
   4 All rights reserved. This program and the accompanying materials
   5 are licensed and made available under the terms and conditions of the BSD License
   6 which accompanies this distribution.  The full text of the license may be found at
   7 http://opensource.org/licenses/bsd-license.php
   8
   9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11
  12 Module Name:
  13
  14   PeiPerformanceLib.c
  15
  16 Abstract:
  17
  18   Performance Library
  19
  20 --*/
  21
  22 /**
  23   Gets PEI the GUID HOB for PEI performance.
  24
  25   This internal function searches for the GUID HOB for PEI performance.
  26   If that GUID HOB is not found, it will build a new one.
  27   It returns the data area of that GUID HOB to record performance log.
  28
  29   @param  Handle                  Pointer to environment specific context used
  30                                   to identify the component being measured.
  31   @param  Token                   Pointer to a Null-terminated ASCII string
  32                                   that identifies the component being measured.
  33   @param  Module                  Pointer to a Null-terminated ASCII string
  34                                   that identifies the module being measured.
  35
  36   @retval The index of log entry in the array.
  37
  38 **/
  39 PEI_PERFORMANCE_LOG_HEADER *
  40 InternalGetPerformanceHobLog (
  41   VOID
  42   )
  43 {
  44   EFI_HOB_GUID_TYPE           *GuidHob;
  45   PEI_PERFORMANCE_LOG_HEADER  *PeiPerformanceLog;
  46   UINTN                       PeiPerformanceLogSize;
  47
  48   GuidHob = GetFirstGuidHob (&gPeiPerformanceHobGuid);
  49
  50   if (GuidHob != NULL) {
  51     //
  52     // PEI Performance HOB was found, then return the existing one.
  53     //
  54     PeiPerformanceLog = GET_GUID_HOB_DATA (GuidHob);
  55   } else {
  56     //
  57     // PEI Performance HOB was not found, then build one.
  58     //
  59     PeiPerformanceLogSize = sizeof (PEI_PERFORMANCE_LOG_HEADER) +
  60                             sizeof (PEI_PERFORMANCE_LOG_ENTRY) * MAX_PEI_PERFORMANCE_LOG_ENTRIES;
  61     PeiPerformanceLog     = BuildGuidHob (&gPeiPerformanceHobGuid, PeiPerformanceLogSize);
  62     PeiPerformanceLog     = ZeroMem (PeiPerformanceLog, PeiPerformanceLogSize);
  63   }
  64
  65   return PeiPerformanceLog;
  66 }
  67
  68 /**
  69   Searches in the log array with keyword Handle, Token and Module.
  70
  71   This internal function searches for the log entry in the log array.
  72   If there is an entry that exactly matches the given key word triple
  73   and its end time stamp is zero, then the index of that log entry is returned;
  74   otherwise, the the number of log entries in the array is returned.
  75
  76   @param  Handle                  Pointer to environment specific context used
  77                                   to identify the component being measured.
  78   @param  Token                   Pointer to a Null-terminated ASCII string
  79                                   that identifies the component being measured.
  80   @param  Module                  Pointer to a Null-terminated ASCII string
  81                                   that identifies the module being measured.
  82
  83   @retval The index of log entry in the array.
  84
  85 **/
  86 UINT32
  87 InternalSearchForLogEntry (
  88   IN PEI_PERFORMANCE_LOG_HEADER *PeiPerformanceLog,
  89   IN CONST VOID                 *Handle,  OPTIONAL
  90   IN CONST CHAR8                *Token,   OPTIONAL
  91   IN CONST CHAR8                *Module   OPTIONAL
  92   )
  93 {
  94   UINT32                    Index;
  95   UINT32                    NumberOfEntries;
  96   PEI_PERFORMANCE_LOG_ENTRY *LogEntryArray;
  97
  98
  99   if (Token == NULL) {
 100     Token = "";
 101   }
 102   if (Module == NULL) {
 103     Module = "";
 104   }
 105   NumberOfEntries = PeiPerformanceLog->NumberOfEntries;
 106   LogEntryArray   = (PEI_PERFORMANCE_LOG_ENTRY *) (PeiPerformanceLog + 1);
 107
 108   for (Index = 0; Index < NumberOfEntries; Index++) {
 109     if ((LogEntryArray[Index].Handle == (EFI_PHYSICAL_ADDRESS) (UINTN) Handle) &&
 110          AsciiStrnCmp (LogEntryArray[Index].Token, Token, PEI_PERFORMANCE_STRING_LENGTH) == 0 &&
 111          AsciiStrnCmp (LogEntryArray[Index].Module, Module, PEI_PERFORMANCE_STRING_LENGTH) == 0 &&
 112          LogEntryArray[Index].EndTimeStamp == 0
 113        ) {
 114       break;
 115     }
 116   }
 117   return Index;
 118 }
 119
 120 /**
 121   Creates a record for the beginning of a performance measurement.
 122
 123   Creates a record that contains the Handle, Token, and Module.
 124   If TimeStamp is not zero, then TimeStamp is added to the record as the start time.
 125   If TimeStamp is zero, then this function reads the current time stamp
 126   and adds that time stamp value to the record as the start time.
 127
 128   @param  Handle                  Pointer to environment specific context used
 129                                   to identify the component being measured.
 130   @param  Token                   Pointer to a Null-terminated ASCII string
 131                                   that identifies the component being measured.
 132   @param  Module                  Pointer to a Null-terminated ASCII string
 133                                   that identifies the module being measured.
 134   @param  TimeStamp               64-bit time stamp.
 135
 136   @retval RETURN_SUCCESS          The start of the measurement was recorded.
 137   @retval RETURN_OUT_OF_RESOURCES There are not enough resources to record the measurement.
 138
 139 **/
 140 RETURN_STATUS
 141 EFIAPI
 142 StartPerformanceMeasurement (
 143   IN CONST VOID   *Handle,  OPTIONAL
 144   IN CONST CHAR8  *Token,   OPTIONAL
 145   IN CONST CHAR8  *Module,  OPTIONAL
 146   IN UINT64       TimeStamp
 147   )
 148 {
 149   PEI_PERFORMANCE_LOG_HEADER  *PeiPerformanceLog;
 150   PEI_PERFORMANCE_LOG_ENTRY   *LogEntryArray;
 151   UINT32                      Index;
 152
 153   PeiPerformanceLog = InternalGetPerformanceHobLog ();
 154
 155   if (PeiPerformanceLog->NumberOfEntries >= MAX_PEI_PERFORMANCE_LOG_ENTRIES) {
 156     return RETURN_OUT_OF_RESOURCES;
 157   }
 158   Index                       = PeiPerformanceLog->NumberOfEntries++;
 159   LogEntryArray               = (PEI_PERFORMANCE_LOG_ENTRY *) (PeiPerformanceLog + 1);
 160   LogEntryArray[Index].Handle = (EFI_PHYSICAL_ADDRESS) (UINTN) Handle;
 161
 162   if (Token != NULL) {
 163     AsciiStrnCpy (LogEntryArray[Index].Token, Token, PEI_PERFORMANCE_STRING_LENGTH);
 164   }
 165   if (Module != NULL) {
 166     AsciiStrnCpy (LogEntryArray[Index].Module, Module, PEI_PERFORMANCE_STRING_LENGTH);
 167   }
 168
 169   if (TimeStamp == 0) {
 170     TimeStamp = GetPerformanceCounter ();
 171   }
 172   LogEntryArray[Index].StartTimeStamp = TimeStamp;
 173
 174   return RETURN_SUCCESS;
 175 }
 176
 177 /**
 178   Fills in the end time of a performance measurement.
 179
 180   Looks up the record that matches Handle, Token, and Module.
 181   If the record can not be found then return RETURN_NOT_FOUND.
 182   If the record is found and TimeStamp is not zero,
 183   then TimeStamp is added to the record as the end time.
 184   If the record is found and TimeStamp is zero, then this function reads
 185   the current time stamp and adds that time stamp value to the record as the end time.
 186   If this function is called multiple times for the same record, then the end time is overwritten.
 187
 188   @param  Handle                  Pointer to environment specific context used
 189                                   to identify the component being measured.
 190   @param  Token                   Pointer to a Null-terminated ASCII string
 191                                   that identifies the component being measured.
 192   @param  Module                  Pointer to a Null-terminated ASCII string
 193                                   that identifies the module being measured.
 194   @param  TimeStamp               64-bit time stamp.
 195
 196   @retval RETURN_SUCCESS          The end of  the measurement was recorded.
 197   @retval RETURN_NOT_FOUND        The specified measurement record could not be found.
 198
 199 **/
 200 RETURN_STATUS
 201 EFIAPI
 202 EndPerformanceMeasurement (
 203   IN CONST VOID   *Handle,  OPTIONAL
 204   IN CONST CHAR8  *Token,   OPTIONAL
 205   IN CONST CHAR8  *Module,  OPTIONAL
 206   IN UINT64       TimeStamp
 207   )
 208 {
 209   PEI_PERFORMANCE_LOG_HEADER  *PeiPerformanceLog;
 210   PEI_PERFORMANCE_LOG_ENTRY   *LogEntryArray;
 211   UINT32                      Index;
 212
 213   if (TimeStamp == 0) {
 214     TimeStamp = GetPerformanceCounter ();
 215   }
 216
 217   PeiPerformanceLog = InternalGetPerformanceHobLog ();
 218   Index             = InternalSearchForLogEntry (PeiPerformanceLog, Handle, Token, Module);
 219   if (Index >= PeiPerformanceLog->NumberOfEntries) {
 220     return RETURN_NOT_FOUND;
 221   }
 222   LogEntryArray     = (PEI_PERFORMANCE_LOG_ENTRY *) (PeiPerformanceLog + 1);
 223   LogEntryArray[Index].EndTimeStamp = TimeStamp;
 224
 225   return RETURN_SUCCESS;
 226 }
 227
 228 /**
 229   Retrieves a previously logged performance measurement.
 230
 231   Looks up the record that matches Handle, Token, and Module.
 232   If the record can not be found then return RETURN_NOT_FOUND.
 233   If the record is found then the start of the measurement is returned in StartTimeStamp,
 234   and the end of the measurement is returned in EndTimeStamp.
 235
 236   @param  LogEntryKey             The key for the previous performance measurement log entry.
 237                                   If 0, then the first performance measurement log entry is retrieved.
 238   @param  Handle                  Pointer to environment specific context used
 239                                   to identify the component being measured.
 240   @param  Token                   Pointer to a Null-terminated ASCII string
 241                                   that identifies the component being measured.
 242   @param  Module                  Pointer to a Null-terminated ASCII string
 243                                   that identifies the module being measured.
 244   @param  StartTimeStamp          The 64-bit time stamp that was recorded when the measurement was started.
 245   @param  EndTimeStamp            The 64-bit time stamp that was recorded when the measurement was ended.
 246
 247   @return The key for the current performance log entry.
 248
 249 **/
 250 UINTN
 251 EFIAPI
 252 GetPerformanceMeasurement (
 253   UINTN           LogEntryKey,
 254   OUT CONST VOID  **Handle,
 255   OUT CONST CHAR8 **Token,
 256   OUT CONST CHAR8 **Module,
 257   OUT UINT64      *StartTimeStamp,
 258   OUT UINT64      *EndTimeStamp
 259   )
 260 {
 261   PEI_PERFORMANCE_LOG_HEADER  *PeiPerformanceLog;
 262   PEI_PERFORMANCE_LOG_ENTRY   *CurrentLogEntry;
 263   PEI_PERFORMANCE_LOG_ENTRY   *LogEntryArray;
 264   UINTN                       NumberOfEntries;
 265
 266   ASSERT (Handle != NULL);
 267   ASSERT (Token != NULL);
 268   ASSERT (Module != NULL);
 269   ASSERT (StartTimeStamp != NULL);
 270   ASSERT (EndTimeStamp != NULL);
 271
 272   PeiPerformanceLog = InternalGetPerformanceHobLog ();
 273
 274   NumberOfEntries   = (UINTN) (PeiPerformanceLog->NumberOfEntries);
 275   LogEntryArray     = (PEI_PERFORMANCE_LOG_ENTRY *) (PeiPerformanceLog + 1);
 276   //
 277   // Make sure that LogEntryKey is a valid log entry key.
 278   //
 279   ASSERT (LogEntryKey <= NumberOfEntries);
 280
 281   if (LogEntryKey == NumberOfEntries) {
 282     return 0;
 283   }
 284
 285   CurrentLogEntry = &(LogEntryArray[LogEntryKey++]);
 286
 287   *Handle         = (VOID *) (UINTN) (CurrentLogEntry->Handle);
 288   *Token          = CurrentLogEntry->Token;
 289   *Module         = CurrentLogEntry->Module;
 290   *StartTimeStamp = CurrentLogEntry->StartTimeStamp;
 291   *EndTimeStamp   = CurrentLogEntry->EndTimeStamp;
 292
 293   return LogEntryKey;
 294 }
 295
 296 /**
 297   Returns TRUE if the performance measurement macros are enabled.
 298
 299   This function returns TRUE if the PERFORMANCE_LIBRARY_PROPERTY_MEASUREMENT_ENABLED bit of
 300   PcdPerformanceLibraryPropertyMask is set.  Otherwise FALSE is returned.
 301
 302   @retval TRUE                    The PERFORMANCE_LIBRARY_PROPERTY_MEASUREMENT_ENABLED bit of
 303                                   PcdPerformanceLibraryPropertyMask is set.
 304   @retval FALSE                   The PERFORMANCE_LIBRARY_PROPERTY_MEASUREMENT_ENABLED bit of
 305                                   PcdPerformanceLibraryPropertyMask is clear.
 306
 307 **/
 308 BOOLEAN
 309 EFIAPI
 310 PerformanceMeasurementEnabled (
 311   VOID
 312   )
 313 {
 314   return ((PcdGet8(PcdPerformanceLibraryPropertyMask) & PERFORMANCE_LIBRARY_PROPERTY_MEASUREMENT_ENABLED) != 0);
 315 }