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/* $Id: mpnotification-r0drv-linux.c $ */
/** @file
* IPRT - Multiprocessor Event Notifications, Ring-0 Driver, Linux.
*/
/*
* Copyright (C) 2008-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "the-linux-kernel.h"
#include "internal/iprt.h"
#include <iprt/asm-amd64-x86.h>
#include <iprt/errcore.h>
#include <iprt/cpuset.h>
#include <iprt/thread.h>
#include "r0drv/mp-r0drv.h"
#if RTLNX_VER_MIN(4,10,0)
static enum cpuhp_state g_rtR0MpOnline;
/*
* Linux 4.10 completely removed CPU notifiers. So let's switch to CPU hotplug
* notification.
*/
static int rtR0MpNotificationLinuxOnline(unsigned int cpu)
{
RTCPUID idCpu = RTMpCpuIdFromSetIndex(cpu);
rtMpNotificationDoCallbacks(RTMPEVENT_ONLINE, idCpu);
return 0;
}
static int rtR0MpNotificationLinuxOffline(unsigned int cpu)
{
RTCPUID idCpu = RTMpCpuIdFromSetIndex(cpu);
rtMpNotificationDoCallbacks(RTMPEVENT_OFFLINE, idCpu);
return 0;
}
DECLHIDDEN(int) rtR0MpNotificationNativeInit(void)
{
int rc;
IPRT_LINUX_SAVE_EFL_AC();
rc = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, "vboxdrv:online",
rtR0MpNotificationLinuxOnline, rtR0MpNotificationLinuxOffline);
IPRT_LINUX_RESTORE_EFL_AC();
/*
* cpuhp_setup_state_nocalls() returns a positive state number for
* CPUHP_AP_ONLINE_DYN or -ENOSPC if there is no free slot available
* (see cpuhp_reserve_state / definition of CPUHP_AP_ONLINE_DYN).
*/
AssertMsgReturn(rc > 0, ("%d\n", rc), RTErrConvertFromErrno(rc));
g_rtR0MpOnline = rc;
return VINF_SUCCESS;
}
DECLHIDDEN(void) rtR0MpNotificationNativeTerm(void)
{
IPRT_LINUX_SAVE_EFL_AC();
cpuhp_remove_state_nocalls(g_rtR0MpOnline);
IPRT_LINUX_RESTORE_EFL_AC();
}
#elif RTLNX_VER_MIN(2,5,71) && defined(CONFIG_SMP)
static int rtMpNotificationLinuxCallback(struct notifier_block *pNotifierBlock, unsigned long ulNativeEvent, void *pvCpu);
/**
* The notifier block we use for registering the callback.
*/
static struct notifier_block g_NotifierBlock =
{
.notifier_call = rtMpNotificationLinuxCallback,
.next = NULL,
.priority = 0
};
# ifdef CPU_DOWN_FAILED
/**
* The set of CPUs we've seen going offline recently.
*/
static RTCPUSET g_MpPendingOfflineSet;
# endif
/**
* The native callback.
*
* @returns NOTIFY_DONE.
* @param pNotifierBlock Pointer to g_NotifierBlock.
* @param ulNativeEvent The native event.
* @param pvCpu The cpu id cast into a pointer value.
*
* @remarks This can fire with preemption enabled and on any CPU.
*/
static int rtMpNotificationLinuxCallback(struct notifier_block *pNotifierBlock, unsigned long ulNativeEvent, void *pvCpu)
{
bool fProcessEvent = false;
RTCPUID idCpu = (uintptr_t)pvCpu;
NOREF(pNotifierBlock);
/*
* Note that redhat/CentOS ported _some_ of the FROZEN macros
* back to their 2.6.18-92.1.10.el5 kernel but actually don't
* use them. Thus we have to test for both CPU_TASKS_FROZEN and
* the individual event variants.
*/
switch (ulNativeEvent)
{
/*
* Pick up online events or failures to go offline.
* Ignore failure events for CPUs we didn't see go offline.
*/
# ifdef CPU_DOWN_FAILED
case CPU_DOWN_FAILED:
# if defined(CPU_TASKS_FROZEN) && defined(CPU_DOWN_FAILED_FROZEN)
case CPU_DOWN_FAILED_FROZEN:
# endif
if (!RTCpuSetIsMember(&g_MpPendingOfflineSet, idCpu))
break; /* fProcessEvents = false */
/* fall thru */
# endif
case CPU_ONLINE:
# if defined(CPU_TASKS_FROZEN) && defined(CPU_ONLINE_FROZEN)
case CPU_ONLINE_FROZEN:
# endif
# ifdef CPU_DOWN_FAILED
RTCpuSetDel(&g_MpPendingOfflineSet, idCpu);
# endif
fProcessEvent = true;
break;
/*
* Pick the earliest possible offline event.
* The only important thing here is that we get the event and that
* it's exactly one.
*/
# ifdef CPU_DOWN_PREPARE
case CPU_DOWN_PREPARE:
# if defined(CPU_TASKS_FROZEN) && defined(CPU_DOWN_PREPARE_FROZEN)
case CPU_DOWN_PREPARE_FROZEN:
# endif
fProcessEvent = true;
# else
case CPU_DEAD:
# if defined(CPU_TASKS_FROZEN) && defined(CPU_DEAD_FROZEN)
case CPU_DEAD_FROZEN:
# endif
/* Don't process CPU_DEAD notifications. */
# endif
# ifdef CPU_DOWN_FAILED
RTCpuSetAdd(&g_MpPendingOfflineSet, idCpu);
# endif
break;
}
if (!fProcessEvent)
return NOTIFY_DONE;
switch (ulNativeEvent)
{
# ifdef CPU_DOWN_FAILED
case CPU_DOWN_FAILED:
# if defined(CPU_TASKS_FROZEN) && defined(CPU_DOWN_FAILED_FROZEN)
case CPU_DOWN_FAILED_FROZEN:
# endif
# endif
case CPU_ONLINE:
# if defined(CPU_TASKS_FROZEN) && defined(CPU_ONLINE_FROZEN)
case CPU_ONLINE_FROZEN:
# endif
rtMpNotificationDoCallbacks(RTMPEVENT_ONLINE, idCpu);
break;
# ifdef CPU_DOWN_PREPARE
case CPU_DOWN_PREPARE:
# if defined(CPU_TASKS_FROZEN) && defined(CPU_DOWN_PREPARE_FROZEN)
case CPU_DOWN_PREPARE_FROZEN:
# endif
rtMpNotificationDoCallbacks(RTMPEVENT_OFFLINE, idCpu);
break;
# endif
}
return NOTIFY_DONE;
}
DECLHIDDEN(int) rtR0MpNotificationNativeInit(void)
{
int rc;
IPRT_LINUX_SAVE_EFL_AC();
# ifdef CPU_DOWN_FAILED
RTCpuSetEmpty(&g_MpPendingOfflineSet);
# endif
rc = register_cpu_notifier(&g_NotifierBlock);
IPRT_LINUX_RESTORE_EFL_AC();
AssertMsgReturn(!rc, ("%d\n", rc), RTErrConvertFromErrno(rc));
return VINF_SUCCESS;
}
DECLHIDDEN(void) rtR0MpNotificationNativeTerm(void)
{
IPRT_LINUX_SAVE_EFL_AC();
unregister_cpu_notifier(&g_NotifierBlock);
IPRT_LINUX_RESTORE_EFL_AC();
}
#else /* Not supported / Not needed */
DECLHIDDEN(int) rtR0MpNotificationNativeInit(void)
{
return VINF_SUCCESS;
}
DECLHIDDEN(void) rtR0MpNotificationNativeTerm(void)
{
}
#endif /* Not supported / Not needed */
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