1 | /* $Id: mpnotification-r0drv-solaris.c 76553 2019-01-01 01:45:53Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - Multiprocessor Event Notifications, Ring-0 Driver, Solaris.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2008-2019 Oracle Corporation
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8 | *
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9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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10 | * available from http://www.virtualbox.org. This file is free software;
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11 | * you can redistribute it and/or modify it under the terms of the GNU
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12 | * General Public License (GPL) as published by the Free Software
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13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | *
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17 | * The contents of this file may alternatively be used under the terms
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18 | * of the Common Development and Distribution License Version 1.0
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19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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20 | * VirtualBox OSE distribution, in which case the provisions of the
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21 | * CDDL are applicable instead of those of the GPL.
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22 | *
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23 | * You may elect to license modified versions of this file under the
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24 | * terms and conditions of either the GPL or the CDDL or both.
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25 | */
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26 |
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27 |
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28 | /*********************************************************************************************************************************
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29 | * Header Files *
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30 | *********************************************************************************************************************************/
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31 | #include "the-solaris-kernel.h"
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32 | #include "internal/iprt.h"
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33 |
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34 | #include <iprt/errcore.h>
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35 | #include <iprt/mp.h>
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36 | #include <iprt/cpuset.h>
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37 | #include <iprt/string.h>
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38 | #include <iprt/thread.h>
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39 | #include "r0drv/mp-r0drv.h"
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40 |
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41 |
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42 | /*********************************************************************************************************************************
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43 | * Global Variables *
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44 | *********************************************************************************************************************************/
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45 | /** Whether CPUs are being watched or not. */
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46 | static volatile bool g_fSolCpuWatch = false;
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47 | /** Set of online cpus that is maintained by the MP callback.
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48 | * This avoids locking issues querying the set from the kernel as well as
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49 | * eliminating any uncertainty regarding the online status during the
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50 | * callback. */
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51 | RTCPUSET g_rtMpSolCpuSet;
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52 |
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53 | /**
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54 | * Internal solaris representation for watching CPUs.
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55 | */
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56 | typedef struct RTMPSOLWATCHCPUS
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57 | {
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58 | /** Function pointer to Mp worker. */
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59 | PFNRTMPWORKER pfnWorker;
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60 | /** Argument to pass to the Mp worker. */
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61 | void *pvArg;
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62 | } RTMPSOLWATCHCPUS;
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63 | typedef RTMPSOLWATCHCPUS *PRTMPSOLWATCHCPUS;
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64 |
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65 |
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66 | /**
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67 | * Solaris callback function for Mp event notification.
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68 | *
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69 | * @returns Solaris error code.
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70 | * @param CpuState The current event/state of the CPU.
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71 | * @param iCpu Which CPU is this event for.
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72 | * @param pvArg Ignored.
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73 | *
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74 | * @remarks This function assumes index == RTCPUID.
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75 | * We may -not- be firing on the CPU going online/offline and called
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76 | * with preemption enabled.
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77 | */
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78 | static int rtMpNotificationCpuEvent(cpu_setup_t CpuState, int iCpu, void *pvArg)
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79 | {
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80 | RTMPEVENT enmMpEvent;
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81 |
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82 | /*
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83 | * Update our CPU set structures first regardless of whether we've been
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84 | * scheduled on the right CPU or not, this is just atomic accounting.
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85 | */
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86 | if (CpuState == CPU_ON)
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87 | {
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88 | enmMpEvent = RTMPEVENT_ONLINE;
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89 | RTCpuSetAdd(&g_rtMpSolCpuSet, iCpu);
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90 | }
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91 | else if (CpuState == CPU_OFF)
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92 | {
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93 | enmMpEvent = RTMPEVENT_OFFLINE;
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94 | RTCpuSetDel(&g_rtMpSolCpuSet, iCpu);
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95 | }
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96 | else
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97 | return 0;
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98 |
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99 | rtMpNotificationDoCallbacks(enmMpEvent, iCpu);
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100 | NOREF(pvArg);
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101 | return 0;
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102 | }
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103 |
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104 |
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105 | DECLHIDDEN(int) rtR0MpNotificationNativeInit(void)
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106 | {
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107 | if (ASMAtomicReadBool(&g_fSolCpuWatch) == true)
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108 | return VERR_WRONG_ORDER;
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109 |
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110 | /*
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111 | * Register the callback building the online cpu set as we do so.
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112 | */
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113 | RTCpuSetEmpty(&g_rtMpSolCpuSet);
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114 |
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115 | mutex_enter(&cpu_lock);
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116 | register_cpu_setup_func(rtMpNotificationCpuEvent, NULL /* pvArg */);
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117 |
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118 | for (int i = 0; i < (int)RTMpGetCount(); ++i)
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119 | if (cpu_is_online(cpu[i]))
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120 | rtMpNotificationCpuEvent(CPU_ON, i, NULL /* pvArg */);
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121 |
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122 | ASMAtomicWriteBool(&g_fSolCpuWatch, true);
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123 | mutex_exit(&cpu_lock);
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124 |
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125 | return VINF_SUCCESS;
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126 | }
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127 |
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128 |
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129 | DECLHIDDEN(void) rtR0MpNotificationNativeTerm(void)
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130 | {
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131 | if (ASMAtomicReadBool(&g_fSolCpuWatch) == true)
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132 | {
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133 | mutex_enter(&cpu_lock);
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134 | unregister_cpu_setup_func(rtMpNotificationCpuEvent, NULL /* pvArg */);
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135 | ASMAtomicWriteBool(&g_fSolCpuWatch, false);
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136 | mutex_exit(&cpu_lock);
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137 | }
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138 | }
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139 |
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