1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
|
/* $Id: mpnotification-r0drv-linux.c $ */
/** @file
* IPRT - Multiprocessor Event Notifications, Ring-0 Driver, Linux.
*/
/*
* Copyright (C) 2008-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE 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.
*/
/*********************************************************************************************************************************
* 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 LINUX_VERSION_CODE >= KERNEL_VERSION(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 LINUX_VERSION_CODE >= KERNEL_VERSION(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 */
|
