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
  46 interruptAccountingInit(void)
  47 {
  48         int bootArgValue = 0;
  49
  50         if (PE_parse_boot_argn("interrupt_accounting", &bootArgValue, sizeof(bootArgValue))) {
  51                 gInterruptAccountingStatisticBitmask = bootArgValue;
  52         }
  53
  54         gInterruptAccountingDataListLock = IOLockAlloc();
  55
  56         assert(gInterruptAccountingDataListLock);
  57
  58         queue_init(&gInterruptAccountingDataList);
  59 }
  60
  61 void
  62 interruptAccountingDataAddToList(IOInterruptAccountingData * data)
  63 {
  64         IOLockLock(gInterruptAccountingDataListLock);
  65         queue_enter(&gInterruptAccountingDataList, data, IOInterruptAccountingData *, chain);
  66         IOLockUnlock(gInterruptAccountingDataListLock);
  67 }
  68
  69 void
  70 interruptAccountingDataRemoveFromList(IOInterruptAccountingData * data)
  71 {
  72         IOLockLock(gInterruptAccountingDataListLock);
  73         queue_remove(&gInterruptAccountingDataList, data, IOInterruptAccountingData *, chain);
  74         IOLockUnlock(gInterruptAccountingDataListLock);
  75 }
  76
  77 void
  78 interruptAccountingDataUpdateChannels(IOInterruptAccountingData * data, IOSimpleReporter * reporter)
  79 {
  80         uint64_t i = 0;
  81
  82         for (i = 0; i < IA_NUM_INTERRUPT_ACCOUNTING_STATISTICS; i++) {
  83                 if (IA_GET_STATISTIC_ENABLED(i)) {
  84                         reporter->setValue(IA_GET_CHANNEL_ID(data->interruptIndex, i), data->interruptStatistics[i]);
  85                 }
  86         }
  87 }
  88
  89 void
  90 interruptAccountingDataInheritChannels(IOInterruptAccountingData * data, IOSimpleReporter * reporter)
  91 {
  92         uint64_t i = 0;
  93
  94         for (i = 0; i < IA_NUM_INTERRUPT_ACCOUNTING_STATISTICS; i++) {
  95                 if (IA_GET_STATISTIC_ENABLED(i)) {
  96                         data->interruptStatistics[i] = reporter->getValue(IA_GET_CHANNEL_ID(data->interruptIndex, i));
  97                 }
  98         }
  99 }