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.
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  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 #include <IOKit/IOInterruptAccountingPrivate.h>
  30 #include <IOKit/IOKernelReporters.h>
  31
  32 uint32_t gInterruptAccountingStatisticBitmask =
  33         /* Disable timestamps for older ARM platforms; they are expensive. */
  34         IA_GET_ENABLE_BIT(kInterruptAccountingFirstLevelTimeIndex) |
  35         IA_GET_ENABLE_BIT(kInterruptAccountingSecondLevelCPUTimeIndex) |
  36         IA_GET_ENABLE_BIT(kInterruptAccountingSecondLevelSystemTimeIndex) |
  37         IA_GET_ENABLE_BIT(kInterruptAccountingFirstLevelCountIndex) |
  38         IA_GET_ENABLE_BIT(kInterruptAccountingSecondLevelCountIndex);
  39
  40 IOLock * gInterruptAccountingDataListLock = NULL;
  41 queue_head_t gInterruptAccountingDataList;
  42
  43 void interruptAccountingInit(void)
  44 {
  45         int bootArgValue = 0;
  46
  47         if (PE_parse_boot_argn("interrupt_accounting", &bootArgValue, sizeof(bootArgValue)))
  48                 gInterruptAccountingStatisticBitmask = bootArgValue;
  49
  50         gInterruptAccountingDataListLock = IOLockAlloc();
  51
  52         assert(gInterruptAccountingDataListLock);
  53
  54         queue_init(&gInterruptAccountingDataList);
  55 }
  56
  57 void interruptAccountingDataAddToList(IOInterruptAccountingData * data)
  58 {
  59         IOLockLock(gInterruptAccountingDataListLock);
  60         queue_enter(&gInterruptAccountingDataList, data, IOInterruptAccountingData *, chain);
  61         IOLockUnlock(gInterruptAccountingDataListLock);
  62 }
  63
  64 void interruptAccountingDataRemoveFromList(IOInterruptAccountingData * data)
  65 {
  66         IOLockLock(gInterruptAccountingDataListLock);
  67         queue_remove(&gInterruptAccountingDataList, data, IOInterruptAccountingData *, chain);
  68         IOLockUnlock(gInterruptAccountingDataListLock);
  69 }
  70
  71 void interruptAccountingDataUpdateChannels(IOInterruptAccountingData * data, IOSimpleReporter * reporter)
  72 {
  73         uint64_t i = 0;
  74
  75         for (i = 0; i < IA_NUM_INTERRUPT_ACCOUNTING_STATISTICS; i++) {
  76                 if (IA_GET_STATISTIC_ENABLED(i))
  77                 reporter->setValue(IA_GET_CHANNEL_ID(data->interruptIndex, i), data->interruptStatistics[i]);
  78         }
  79 }
  80
  81 void interruptAccountingDataInheritChannels(IOInterruptAccountingData * data, IOSimpleReporter * reporter)
  82 {
  83         uint64_t i = 0;
  84
  85         for (i = 0; i < IA_NUM_INTERRUPT_ACCOUNTING_STATISTICS; i++) {
  86                 if (IA_GET_STATISTIC_ENABLED(i))
  87                 data->interruptStatistics[i] = reporter->getValue(IA_GET_CHANNEL_ID(data->interruptIndex, i));
  88         }
  89 }
  90