VirtualBox

source: vbox/trunk/src/VBox/Runtime/r0drv/solaris/mpnotification-r0drv-solaris.c@ 81106

Last change on this file since 81106 was 76553, checked in by vboxsync, 6 years ago

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  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 4.6 KB
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1/* $Id: mpnotification-r0drv-solaris.c 76553 2019-01-01 01:45:53Z vboxsync $ */
2/** @file
3 * IPRT - Multiprocessor Event Notifications, Ring-0 Driver, Solaris.
4 */
5
6/*
7 * Copyright (C) 2008-2019 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 *
17 * The contents of this file may alternatively be used under the terms
18 * of the Common Development and Distribution License Version 1.0
19 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20 * VirtualBox OSE distribution, in which case the provisions of the
21 * CDDL are applicable instead of those of the GPL.
22 *
23 * You may elect to license modified versions of this file under the
24 * terms and conditions of either the GPL or the CDDL or both.
25 */
26
27
28/*********************************************************************************************************************************
29* Header Files *
30*********************************************************************************************************************************/
31#include "the-solaris-kernel.h"
32#include "internal/iprt.h"
33
34#include <iprt/errcore.h>
35#include <iprt/mp.h>
36#include <iprt/cpuset.h>
37#include <iprt/string.h>
38#include <iprt/thread.h>
39#include "r0drv/mp-r0drv.h"
40
41
42/*********************************************************************************************************************************
43* Global Variables *
44*********************************************************************************************************************************/
45/** Whether CPUs are being watched or not. */
46static volatile bool g_fSolCpuWatch = false;
47/** Set of online cpus that is maintained by the MP callback.
48 * This avoids locking issues querying the set from the kernel as well as
49 * eliminating any uncertainty regarding the online status during the
50 * callback. */
51RTCPUSET g_rtMpSolCpuSet;
52
53/**
54 * Internal solaris representation for watching CPUs.
55 */
56typedef struct RTMPSOLWATCHCPUS
57{
58 /** Function pointer to Mp worker. */
59 PFNRTMPWORKER pfnWorker;
60 /** Argument to pass to the Mp worker. */
61 void *pvArg;
62} RTMPSOLWATCHCPUS;
63typedef RTMPSOLWATCHCPUS *PRTMPSOLWATCHCPUS;
64
65
66/**
67 * Solaris callback function for Mp event notification.
68 *
69 * @returns Solaris error code.
70 * @param CpuState The current event/state of the CPU.
71 * @param iCpu Which CPU is this event for.
72 * @param pvArg Ignored.
73 *
74 * @remarks This function assumes index == RTCPUID.
75 * We may -not- be firing on the CPU going online/offline and called
76 * with preemption enabled.
77 */
78static int rtMpNotificationCpuEvent(cpu_setup_t CpuState, int iCpu, void *pvArg)
79{
80 RTMPEVENT enmMpEvent;
81
82 /*
83 * Update our CPU set structures first regardless of whether we've been
84 * scheduled on the right CPU or not, this is just atomic accounting.
85 */
86 if (CpuState == CPU_ON)
87 {
88 enmMpEvent = RTMPEVENT_ONLINE;
89 RTCpuSetAdd(&g_rtMpSolCpuSet, iCpu);
90 }
91 else if (CpuState == CPU_OFF)
92 {
93 enmMpEvent = RTMPEVENT_OFFLINE;
94 RTCpuSetDel(&g_rtMpSolCpuSet, iCpu);
95 }
96 else
97 return 0;
98
99 rtMpNotificationDoCallbacks(enmMpEvent, iCpu);
100 NOREF(pvArg);
101 return 0;
102}
103
104
105DECLHIDDEN(int) rtR0MpNotificationNativeInit(void)
106{
107 if (ASMAtomicReadBool(&g_fSolCpuWatch) == true)
108 return VERR_WRONG_ORDER;
109
110 /*
111 * Register the callback building the online cpu set as we do so.
112 */
113 RTCpuSetEmpty(&g_rtMpSolCpuSet);
114
115 mutex_enter(&cpu_lock);
116 register_cpu_setup_func(rtMpNotificationCpuEvent, NULL /* pvArg */);
117
118 for (int i = 0; i < (int)RTMpGetCount(); ++i)
119 if (cpu_is_online(cpu[i]))
120 rtMpNotificationCpuEvent(CPU_ON, i, NULL /* pvArg */);
121
122 ASMAtomicWriteBool(&g_fSolCpuWatch, true);
123 mutex_exit(&cpu_lock);
124
125 return VINF_SUCCESS;
126}
127
128
129DECLHIDDEN(void) rtR0MpNotificationNativeTerm(void)
130{
131 if (ASMAtomicReadBool(&g_fSolCpuWatch) == true)
132 {
133 mutex_enter(&cpu_lock);
134 unregister_cpu_setup_func(rtMpNotificationCpuEvent, NULL /* pvArg */);
135 ASMAtomicWriteBool(&g_fSolCpuWatch, false);
136 mutex_exit(&cpu_lock);
137 }
138}
139
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