iokit/Kernel/IOInterruptAccounting.cpp

   1 /*
   2  * Copyright (c) 2014 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 #include <IOKit/IOInterruptAccountingPrivate.h>
  30 #include <IOKit/IOKernelReporters.h>
  31
  32 uint32_t gInterruptAccountingStatisticBitmask =
  33 #if !defined(__arm__)
  34         /* Disable timestamps for older ARM platforms; they are expensive. */
  35         IA_GET_ENABLE_BIT(kInterruptAccountingFirstLevelTimeIndex) |
  36         IA_GET_ENABLE_BIT(kInterruptAccountingSecondLevelCPUTimeIndex) |
  37         IA_GET_ENABLE_BIT(kInterruptAccountingSecondLevelSystemTimeIndex) |
  38 #endif
  39         IA_GET_ENABLE_BIT(kInterruptAccountingFirstLevelCountIndex) |
  40         IA_GET_ENABLE_BIT(kInterruptAccountingSecondLevelCountIndex);
  41
  42 IOLock * gInterruptAccountingDataListLock = NULL;
  43 queue_head_t gInterruptAccountingDataList;
  44
  45 void interruptAccountingInit(void)
  46 {
  47         int bootArgValue = 0;
  48
  49         if (PE_parse_boot_argn("interrupt_accounting", &bootArgValue, sizeof(bootArgValue)))
  50                 gInterruptAccountingStatisticBitmask = bootArgValue;
  51
  52         gInterruptAccountingDataListLock = IOLockAlloc();
  53
  54         assert(gInterruptAccountingDataListLock);
  55
  56         queue_init(&gInterruptAccountingDataList);
  57 }
  58
  59 void interruptAccountingDataAddToList(IOInterruptAccountingData * data)
  60 {
  61         IOLockLock(gInterruptAccountingDataListLock);
  62         queue_enter(&gInterruptAccountingDataList, data, IOInterruptAccountingData *, chain);
  63         IOLockUnlock(gInterruptAccountingDataListLock);
  64 }
  65
  66 void interruptAccountingDataRemoveFromList(IOInterruptAccountingData * data)
  67 {
  68         IOLockLock(gInterruptAccountingDataListLock);
  69         queue_remove(&gInterruptAccountingDataList, data, IOInterruptAccountingData *, chain);
  70         IOLockUnlock(gInterruptAccountingDataListLock);
  71 }
  72
  73 void interruptAccountingDataUpdateChannels(IOInterruptAccountingData * data, IOSimpleReporter * reporter)
  74 {
  75         uint64_t i = 0;
  76
  77         for (i = 0; i < IA_NUM_INTERRUPT_ACCOUNTING_STATISTICS; i++) {
  78                 if (IA_GET_STATISTIC_ENABLED(i))
  79                 reporter->setValue(IA_GET_CHANNEL_ID(data->interruptIndex, i), data->interruptStatistics[i]);
  80         }
  81 }
  82
  83 void interruptAccountingDataInheritChannels(IOInterruptAccountingData * data, IOSimpleReporter * reporter)
  84 {
  85         uint64_t i = 0;
  86
  87         for (i = 0; i < IA_NUM_INTERRUPT_ACCOUNTING_STATISTICS; i++) {
  88                 if (IA_GET_STATISTIC_ENABLED(i))
  89                 data->interruptStatistics[i] = reporter->getValue(IA_GET_CHANNEL_ID(data->interruptIndex, i));
  90         }
  91 }
  92