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/*++
Copyright (c) 2006, Intel Corporation
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
Module Name:
DxePerformanceLib.c
Abstract:
Performance Library
--*/
STATIC PERFORMANCE_PROTOCOL *mPerformance = NULL;
/**
The constructor function caches the pointer to Performance protocol.
The constructor function locates Performance protocol from protocol database.
It will ASSERT() if that operation fails and it will always return EFI_SUCCESS.
@retval EFI_SUCCESS Performance protocol is successfully located.
@retval Other Performance protocol is not located to log performance.
**/
STATIC
EFI_STATUS
GetPerformanceProtocol (
VOID
)
{
EFI_STATUS Status;
PERFORMANCE_PROTOCOL *Performance;
if (mPerformance != NULL) {
return EFI_SUCCESS;
}
Status = gBS->LocateProtocol (&gPerformanceProtocolGuid, NULL, (VOID **) &Performance);
if (!EFI_ERROR (Status)) {
ASSERT (Performance != NULL);
//
// Cache performance protocol.
//
mPerformance = Performance;
}
return Status;
}
/**
Creates a record for the beginning of a performance measurement.
Creates a record that contains the Handle, Token, and Module.
If TimeStamp is not zero, then TimeStamp is added to the record as the start time.
If TimeStamp is zero, then this function reads the current time stamp
and adds that time stamp value to the record as the start time.
@param Handle Pointer to environment specific context used
to identify the component being measured.
@param Token Pointer to a Null-terminated ASCII string
that identifies the component being measured.
@param Module Pointer to a Null-terminated ASCII string
that identifies the module being measured.
@param TimeStamp 64-bit time stamp.
@retval RETURN_SUCCESS The start of the measurement was recorded.
@retval RETURN_OUT_OF_RESOURCES There are not enough resources to record the measurement.
**/
RETURN_STATUS
EFIAPI
StartPerformanceMeasurement (
IN CONST VOID *Handle, OPTIONAL
IN CONST CHAR8 *Token, OPTIONAL
IN CONST CHAR8 *Module, OPTIONAL
IN UINT64 TimeStamp
)
{
EFI_STATUS Status;
Status = GetPerformanceProtocol ();
if (EFI_ERROR (Status)) {
return RETURN_OUT_OF_RESOURCES;
}
Status = mPerformance->StartGauge (Handle, Token, Module, TimeStamp);
return (RETURN_STATUS) Status;
}
/**
Fills in the end time of a performance measurement.
Looks up the record that matches Handle, Token, and Module.
If the record can not be found then return RETURN_NOT_FOUND.
If the record is found and TimeStamp is not zero,
then TimeStamp is added to the record as the end time.
If the record is found and TimeStamp is zero, then this function reads
the current time stamp and adds that time stamp value to the record as the end time.
If this function is called multiple times for the same record, then the end time is overwritten.
@param Handle Pointer to environment specific context used
to identify the component being measured.
@param Token Pointer to a Null-terminated ASCII string
that identifies the component being measured.
@param Module Pointer to a Null-terminated ASCII string
that identifies the module being measured.
@param TimeStamp 64-bit time stamp.
@retval RETURN_SUCCESS The end of the measurement was recorded.
@retval RETURN_NOT_FOUND The specified measurement record could not be found.
**/
RETURN_STATUS
EFIAPI
EndPerformanceMeasurement (
IN CONST VOID *Handle, OPTIONAL
IN CONST CHAR8 *Token, OPTIONAL
IN CONST CHAR8 *Module, OPTIONAL
IN UINT64 TimeStamp
)
{
EFI_STATUS Status;
Status = GetPerformanceProtocol ();
if (EFI_ERROR (Status)) {
return RETURN_NOT_FOUND;
}
Status = mPerformance->EndGauge (Handle, Token, Module, TimeStamp);
return (RETURN_STATUS) Status;
}
/**
Attempts to retrieve a performance measurement log entry from the performance measurement log.
Attempts to retrieve the performance log entry specified by LogEntryKey. If LogEntryKey is
zero on entry, then an attempt is made to retrieve the first entry from the performance log,
and the key for the second entry in the log is returned. If the performance log is empty,
then no entry is retrieved and zero is returned. If LogEntryKey is not zero, then the performance
log entry associated with LogEntryKey is retrieved, and the key for the next entry in the log is
returned. If LogEntryKey is the key for the last entry in the log, then the last log entry is
retrieved and an implementation specific non-zero key value that specifies the end of the performance
log is returned. If LogEntryKey is equal this implementation specific non-zero key value, then no entry
is retrieved and zero is returned. In the cases where a performance log entry can be returned,
the log entry is returned in Handle, Token, Module, StartTimeStamp, and EndTimeStamp.
If LogEntryKey is not a valid log entry key for the performance measurement log, then ASSERT().
If Handle is NULL, then ASSERT().
If Token is NULL, then ASSERT().
If Module is NULL, then ASSERT().
If StartTimeStamp is NULL, then ASSERT().
If EndTimeStamp is NULL, then ASSERT().
@param LogEntryKey On entry, the key of the performance measurement log entry to retrieve.
0, then the first performance measurement log entry is retrieved.
On exit, the key of the next performance lof entry entry.
@param Handle Pointer to environment specific context used to identify the component
being measured.
@param Token Pointer to a Null-terminated ASCII string that identifies the component
being measured.
@param Module Pointer to a Null-terminated ASCII string that identifies the module
being measured.
@param StartTimeStamp Pointer to the 64-bit time stamp that was recorded when the measurement
was started.
@param EndTimeStamp Pointer to the 64-bit time stamp that was recorded when the measurement
was ended.
@return The key for the next performance log entry (in general case).
**/
UINTN
EFIAPI
GetPerformanceMeasurement (
IN UINTN LogEntryKey,
OUT CONST VOID **Handle,
OUT CONST CHAR8 **Token,
OUT CONST CHAR8 **Module,
OUT UINT64 *StartTimeStamp,
OUT UINT64 *EndTimeStamp
)
{
EFI_STATUS Status;
GAUGE_DATA_ENTRY *GaugeData;
ASSERT (Handle != NULL);
ASSERT (Token != NULL);
ASSERT (Module != NULL);
ASSERT (StartTimeStamp != NULL);
ASSERT (EndTimeStamp != NULL);
Status = GetPerformanceProtocol ();
if (EFI_ERROR (Status)) {
return 0;
}
Status = mPerformance->GetGauge (LogEntryKey++, &GaugeData);
//
// Make sure that LogEntryKey is a valid log entry key,
//
ASSERT (Status != EFI_INVALID_PARAMETER);
if (EFI_ERROR (Status)) {
//
// The LogEntryKey is the last entry (equals to the total entry number).
//
return 0;
}
ASSERT (GaugeData != NULL);
*Handle = (VOID *) (UINTN) GaugeData->Handle;
*Token = GaugeData->Token;
*Module = GaugeData->Module;
*StartTimeStamp = GaugeData->StartTimeStamp;
*EndTimeStamp = GaugeData->EndTimeStamp;
return LogEntryKey;
}
/**
Returns TRUE if the performance measurement macros are enabled.
This function returns TRUE if the PERFORMANCE_LIBRARY_PROPERTY_MEASUREMENT_ENABLED bit of
PcdPerformanceLibraryPropertyMask is set. Otherwise FALSE is returned.
@retval TRUE The PERFORMANCE_LIBRARY_PROPERTY_MEASUREMENT_ENABLED bit of
PcdPerformanceLibraryPropertyMask is set.
@retval FALSE The PERFORMANCE_LIBRARY_PROPERTY_MEASUREMENT_ENABLED bit of
PcdPerformanceLibraryPropertyMask is clear.
**/
BOOLEAN
EFIAPI
PerformanceMeasurementEnabled (
VOID
)
{
return (BOOLEAN) ((PcdGet8(PcdPerformanceLibraryPropertyMask) & PERFORMANCE_LIBRARY_PROPERTY_MEASUREMENT_ENABLED) != 0);
}
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