| 1 | /* $Id: mpnotification-r0drv-linux.c 9313 2008-06-02 15:29:36Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Multiprocessor Event Notifications, Ring-0 Driver, Linux.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2008 Sun Microsystems, Inc.
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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 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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| 27 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
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| 28 | * additional information or have any questions.
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| 29 | *
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| 30 | */
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| 31 |
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| 32 | /*******************************************************************************
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| 33 | * Header Files *
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| 34 | *******************************************************************************/
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| 35 | #include "the-linux-kernel.h"
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| 36 |
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| 37 | #include <iprt/mp.h>
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| 38 | #include <iprt/err.h>
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| 39 | #include <iprt/cpuset.h>
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| 40 | #include "r0drv/mp-r0drv.h"
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| 41 |
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| 42 |
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| 43 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 71) && defined(CONFIG_SMP)
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| 44 |
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| 45 | /*******************************************************************************
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| 46 | * Internal Functions *
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| 47 | *******************************************************************************/
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| 48 | static int rtMpNotificationLinuxCallback(struct notifier_block *pNotifierBlock, unsigned long ulNativeEvent, void *pvCpu);
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| 49 |
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| 50 |
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| 51 | /*******************************************************************************
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| 52 | * Global Variables *
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| 53 | *******************************************************************************/
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| 54 | /**
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| 55 | * The notifier block we use for registering the callback.
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| 56 | */
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| 57 | static struct notifier_block g_NotifierBlock =
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| 58 | {
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| 59 | .notifier_call = rtMpNotificationLinuxCallback,
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| 60 | .next = NULL,
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| 61 | .priority = 0
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| 62 | };
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| 63 |
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| 64 | #ifdef CPU_DOWN_FAILED
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| 65 | /**
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| 66 | * The set of CPUs we've seen going offline recently.
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| 67 | */
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| 68 | static RTCPUSET g_MpPendingOfflineSet;
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| 69 | #endif
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| 70 |
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| 71 |
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| 72 | /**
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| 73 | * The native callback.
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| 74 | *
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| 75 | * @returns 0.
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| 76 | * @param pNotifierBlock Pointer to g_NotifierBlock.
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| 77 | * @param ulNativeEvent The native event.
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| 78 | * @param pvCpu The cpu id cast into a pointer value.
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| 79 | */
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| 80 | static int rtMpNotificationLinuxCallback(struct notifier_block *pNotifierBlock, unsigned long ulNativeEvent, void *pvCpu)
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| 81 | {
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| 82 | RTCPUID idCpu = (uintptr_t)pvCpu;
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| 83 | NOREF(pNotifierBlock);
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| 84 |
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| 85 | /* ASSUMES iCpu == RTCPUID */
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| 86 | switch (ulNativeEvent)
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| 87 | {
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| 88 | #ifdef CPU_DOWN_FAILED
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| 89 | case CPU_DOWN_FAILED:
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| 90 | # ifdef CPU_TASKS_FROZEN
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| 91 | case CPU_DOWN_FAILED_FROZEN:
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| 92 | # endif
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| 93 | if (!RTCpuSetIsMember(&g_MpPendingOfflineSet, idCpu))
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| 94 | return 0;
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| 95 | /* fall thru */
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| 96 | #endif
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| 97 | case CPU_ONLINE:
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| 98 | # ifdef CPU_TASKS_FROZEN
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| 99 | case CPU_ONLINE_FROZEN:
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| 100 | # endif
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| 101 | RTCpuSetDel(&g_MpPendingOfflineSet, idCpu);
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| 102 | rtMpNotificationDoCallbacks(RTMPEVENT_ONLINE, idCpu);
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| 103 | break;
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| 104 |
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| 105 | #ifdef CPU_DOWN_PREPARE
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| 106 | case CPU_DOWN_PREPARE:
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| 107 | # ifdef CPU_TASKS_FROZEN
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| 108 | case CPU_DOWN_PREPARE_FROZEN:
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| 109 | # endif
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| 110 | #else
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| 111 | case CPU_DEAD:
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| 112 | # ifdef CPU_TASKS_FROZEN
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| 113 | case CPU_DEAD_FROZEN:
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| 114 | # endif
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| 115 | #endif
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| 116 | rtMpNotificationDoCallbacks(RTMPEVENT_OFFLINE, idCpu);
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| 117 | RTCpuSetAdd(&g_MpPendingOfflineSet, idCpu);
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| 118 | break;
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| 119 | }
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| 120 |
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| 121 | return NOTIFY_DONE;
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| 122 | }
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| 123 |
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| 124 |
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| 125 | int rtR0MpNotificationNativeInit(void *pvOS)
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| 126 | {
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| 127 | int rc;
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| 128 | NOREF(pvOS);
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| 129 |
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| 130 | #ifdef CPU_DOWN_FAILED
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| 131 | RTCpuSetEmpty(&g_MpPendingOfflineSet);
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| 132 | #endif
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| 133 |
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| 134 | rc = register_cpu_notifier(&g_NotifierBlock);
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| 135 | AssertMsgReturn(!rc, ("%d\n", rc), RTErrConvertFromErrno(rc));
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| 136 | return VINF_SUCCESS;
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| 137 | }
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| 138 |
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| 139 |
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| 140 | void rtR0MpNotificationNativeTerm(void *pvOS)
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| 141 | {
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| 142 | unregister_cpu_notifier(&g_NotifierBlock);
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| 143 | }
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| 144 |
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| 145 | #else /* Not supported / Not needed */
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| 146 |
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| 147 | int rtR0MpNotificationNativeInit(void *pvOS)
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| 148 | {
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| 149 | NOREF(pvOS);
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| 150 | return VINF_SUCCESS;
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| 151 | }
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| 152 |
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| 153 | void rtR0MpNotificationNativeTerm(void *pvOS)
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| 154 | {
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| 155 | NOREF(pvOS);
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| 156 | }
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| 157 |
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| 158 | #endif /* Not supported / Not needed */
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| 159 |
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