VirtualBox

source: vbox/trunk/src/VBox/Runtime/r0drv/linux/mp-r0drv-linux.c

Last change on this file was 106061, checked in by vboxsync, 2 months ago

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1/* $Id: mp-r0drv-linux.c 106061 2024-09-16 14:03:52Z vboxsync $ */
2/** @file
3 * IPRT - Multiprocessor, Ring-0 Driver, Linux.
4 */
5
6/*
7 * Copyright (C) 2008-2024 Oracle and/or its affiliates.
8 *
9 * This file is part of VirtualBox base platform packages, as
10 * available from https://www.virtualbox.org.
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation, in version 3 of the
15 * License.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, see <https://www.gnu.org/licenses>.
24 *
25 * The contents of this file may alternatively be used under the terms
26 * of the Common Development and Distribution License Version 1.0
27 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28 * in the VirtualBox distribution, in which case the provisions of the
29 * CDDL are applicable instead of those of the GPL.
30 *
31 * You may elect to license modified versions of this file under the
32 * terms and conditions of either the GPL or the CDDL or both.
33 *
34 * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35 */
36
37
38/*********************************************************************************************************************************
39* Header Files *
40*********************************************************************************************************************************/
41#include "the-linux-kernel.h"
42#include "internal/iprt.h"
43
44#include <iprt/mp.h>
45#include <iprt/cpuset.h>
46#include <iprt/err.h>
47#include <iprt/asm.h>
48#include <iprt/thread.h>
49#include "r0drv/mp-r0drv.h"
50
51
52/*********************************************************************************************************************************
53* Defined Constants And Macros *
54*********************************************************************************************************************************/
55#if defined(nr_cpumask_bits) || RTLNX_VER_MIN(2,6,28)
56# define VBOX_NR_CPUMASK_BITS (nr_cpumask_bits) /* same as nr_cpu_ids */
57#else
58# define VBOX_NR_CPUMASK_BITS (NR_CPUS)
59#endif
60
61
62RTDECL(RTCPUID) RTMpCpuId(void)
63{
64 return smp_processor_id();
65}
66RT_EXPORT_SYMBOL(RTMpCpuId);
67
68
69RTDECL(int) RTMpCurSetIndex(void)
70{
71 return smp_processor_id();
72}
73RT_EXPORT_SYMBOL(RTMpCurSetIndex);
74
75
76RTDECL(int) RTMpCurSetIndexAndId(PRTCPUID pidCpu)
77{
78 return *pidCpu = smp_processor_id();
79}
80RT_EXPORT_SYMBOL(RTMpCurSetIndexAndId);
81
82
83RTDECL(int) RTMpCpuIdToSetIndex(RTCPUID idCpu)
84{
85 return idCpu < RTCPUSET_MAX_CPUS && idCpu < VBOX_NR_CPUMASK_BITS ? (int)idCpu : -1;
86}
87RT_EXPORT_SYMBOL(RTMpCpuIdToSetIndex);
88
89
90RTDECL(RTCPUID) RTMpCpuIdFromSetIndex(int iCpu)
91{
92 return (unsigned)iCpu < VBOX_NR_CPUMASK_BITS ? (RTCPUID)iCpu : NIL_RTCPUID;
93}
94RT_EXPORT_SYMBOL(RTMpCpuIdFromSetIndex);
95
96
97RTDECL(RTCPUID) RTMpGetMaxCpuId(void)
98{
99 return VBOX_NR_CPUMASK_BITS - 1;
100}
101RT_EXPORT_SYMBOL(RTMpGetMaxCpuId);
102
103
104RTDECL(bool) RTMpIsCpuPossible(RTCPUID idCpu)
105{
106#if defined(CONFIG_SMP)
107# if RTLNX_VER_MIN(2,6,2) || defined(cpu_possible)
108 return idCpu < VBOX_NR_CPUMASK_BITS && cpu_possible(idCpu);
109# else /* < 2.5.29 */
110 return idCpu < (RTCPUID)(smp_num_cpus);
111# endif
112#else
113 return idCpu == RTMpCpuId();
114#endif
115}
116RT_EXPORT_SYMBOL(RTMpIsCpuPossible);
117
118
119RTDECL(PRTCPUSET) RTMpGetSet(PRTCPUSET pSet)
120{
121 RTCPUID idCpu;
122
123 RTCpuSetEmpty(pSet);
124 idCpu = RTMpGetMaxCpuId();
125 do
126 {
127 if (RTMpIsCpuPossible(idCpu))
128 RTCpuSetAdd(pSet, idCpu);
129 } while (idCpu-- > 0);
130 return pSet;
131}
132RT_EXPORT_SYMBOL(RTMpGetSet);
133
134
135RTDECL(RTCPUID) RTMpGetCount(void)
136{
137#ifdef CONFIG_SMP
138# if RTLNX_VER_MIN(2,6,4) || defined(num_possible_cpus)
139 return num_possible_cpus();
140# elif RTLNX_VER_MAX(2,5,0)
141 return smp_num_cpus;
142# else
143 RTCPUSET Set;
144 RTMpGetSet(&Set);
145 return RTCpuSetCount(&Set);
146# endif
147#else
148 return 1;
149#endif
150}
151RT_EXPORT_SYMBOL(RTMpGetCount);
152
153
154RTDECL(bool) RTMpIsCpuOnline(RTCPUID idCpu)
155{
156#ifdef CONFIG_SMP
157# if RTLNX_VER_MIN(2,6,0) || defined(cpu_online)
158 return idCpu < VBOX_NR_CPUMASK_BITS && cpu_online(idCpu);
159# else /* 2.4: */
160 return idCpu < VBOX_NR_CPUMASK_BITS && cpu_online_map & RT_BIT_64(idCpu);
161# endif
162#else
163 return idCpu == RTMpCpuId();
164#endif
165}
166RT_EXPORT_SYMBOL(RTMpIsCpuOnline);
167
168
169RTDECL(PRTCPUSET) RTMpGetOnlineSet(PRTCPUSET pSet)
170{
171#ifdef CONFIG_SMP
172 RTCPUID idCpu;
173
174 RTCpuSetEmpty(pSet);
175 idCpu = RTMpGetMaxCpuId();
176 do
177 {
178 if (RTMpIsCpuOnline(idCpu))
179 RTCpuSetAdd(pSet, idCpu);
180 } while (idCpu-- > 0);
181#else
182 RTCpuSetEmpty(pSet);
183 RTCpuSetAdd(pSet, RTMpCpuId());
184#endif
185 return pSet;
186}
187RT_EXPORT_SYMBOL(RTMpGetOnlineSet);
188
189
190RTDECL(RTCPUID) RTMpGetOnlineCount(void)
191{
192#ifdef CONFIG_SMP
193# if RTLNX_VER_MIN(2,6,0) || defined(num_online_cpus)
194 return num_online_cpus();
195# else
196 RTCPUSET Set;
197 RTMpGetOnlineSet(&Set);
198 return RTCpuSetCount(&Set);
199# endif
200#else
201 return 1;
202#endif
203}
204RT_EXPORT_SYMBOL(RTMpGetOnlineCount);
205
206
207RTDECL(bool) RTMpIsCpuWorkPending(void)
208{
209 /** @todo (not used on non-Windows platforms yet). */
210 return false;
211}
212RT_EXPORT_SYMBOL(RTMpIsCpuWorkPending);
213
214
215/**
216 * Wrapper between the native linux per-cpu callbacks and PFNRTWORKER.
217 *
218 * @param pvInfo Pointer to the RTMPARGS package.
219 */
220static void rtmpLinuxWrapper(void *pvInfo)
221{
222 PRTMPARGS pArgs = (PRTMPARGS)pvInfo;
223 ASMAtomicIncU32(&pArgs->cHits);
224 pArgs->pfnWorker(RTMpCpuId(), pArgs->pvUser1, pArgs->pvUser2);
225}
226
227#ifdef CONFIG_SMP
228
229# if RTLNX_VER_MIN(2,6,27)
230/**
231 * Wrapper between the native linux per-cpu callbacks and PFNRTWORKER, does hit
232 * increment after calling the worker.
233 *
234 * @param pvInfo Pointer to the RTMPARGS package.
235 */
236static void rtmpLinuxWrapperPostInc(void *pvInfo)
237{
238 PRTMPARGS pArgs = (PRTMPARGS)pvInfo;
239 pArgs->pfnWorker(RTMpCpuId(), pArgs->pvUser1, pArgs->pvUser2);
240 ASMAtomicIncU32(&pArgs->cHits);
241}
242# endif
243
244
245/**
246 * Wrapper between the native linux all-cpu callbacks and PFNRTWORKER.
247 *
248 * @param pvInfo Pointer to the RTMPARGS package.
249 */
250static void rtmpLinuxAllWrapper(void *pvInfo)
251{
252 PRTMPARGS pArgs = (PRTMPARGS)pvInfo;
253 PRTCPUSET pWorkerSet = pArgs->pWorkerSet;
254 RTCPUID idCpu = RTMpCpuId();
255 Assert(!RTThreadPreemptIsEnabled(NIL_RTTHREAD));
256
257 if (RTCpuSetIsMember(pWorkerSet, idCpu))
258 {
259 pArgs->pfnWorker(idCpu, pArgs->pvUser1, pArgs->pvUser2);
260 RTCpuSetDel(pWorkerSet, idCpu);
261 }
262}
263
264#endif /* CONFIG_SMP */
265
266RTDECL(int) RTMpOnAll(PFNRTMPWORKER pfnWorker, void *pvUser1, void *pvUser2)
267{
268 IPRT_LINUX_SAVE_EFL_AC();
269 RTMPARGS Args;
270 RTCPUSET OnlineSet;
271 RTCPUID idCpu;
272#ifdef CONFIG_SMP
273 uint32_t cLoops;
274#endif
275
276 RTTHREADPREEMPTSTATE PreemptState = RTTHREADPREEMPTSTATE_INITIALIZER;
277
278 Args.pfnWorker = pfnWorker;
279 Args.pvUser1 = pvUser1;
280 Args.pvUser2 = pvUser2;
281 Args.idCpu = NIL_RTCPUID;
282 Args.cHits = 0;
283
284 RTThreadPreemptDisable(&PreemptState);
285 RTMpGetOnlineSet(&OnlineSet);
286 Args.pWorkerSet = &OnlineSet;
287 idCpu = RTMpCpuId();
288
289#ifdef CONFIG_SMP
290 if (RTCpuSetCount(&OnlineSet) > 1)
291 {
292 /* Fire the function on all other CPUs without waiting for completion. */
293# if RTLNX_VER_MIN(5,3,0)
294 smp_call_function(rtmpLinuxAllWrapper, &Args, 0 /* wait */);
295# elif RTLNX_VER_MIN(2,6,27)
296 int rc = smp_call_function(rtmpLinuxAllWrapper, &Args, 0 /* wait */);
297 Assert(!rc); NOREF(rc);
298# else
299 int rc = smp_call_function(rtmpLinuxAllWrapper, &Args, 0 /* retry */, 0 /* wait */);
300 Assert(!rc); NOREF(rc);
301# endif
302 }
303#endif
304
305 /* Fire the function on this CPU. */
306 Args.pfnWorker(idCpu, Args.pvUser1, Args.pvUser2);
307 RTCpuSetDel(Args.pWorkerSet, idCpu);
308
309#ifdef CONFIG_SMP
310 /* Wait for all of them finish. */
311 cLoops = 64000;
312 while (!RTCpuSetIsEmpty(Args.pWorkerSet))
313 {
314 /* Periodically check if any CPU in the wait set has gone offline, if so update the wait set. */
315 if (!cLoops--)
316 {
317 RTCPUSET OnlineSetNow;
318 RTMpGetOnlineSet(&OnlineSetNow);
319 RTCpuSetAnd(Args.pWorkerSet, &OnlineSetNow);
320
321 cLoops = 64000;
322 }
323
324 ASMNopPause();
325 }
326#endif
327
328 RTThreadPreemptRestore(&PreemptState);
329 IPRT_LINUX_RESTORE_EFL_AC();
330 return VINF_SUCCESS;
331}
332RT_EXPORT_SYMBOL(RTMpOnAll);
333
334
335RTDECL(int) RTMpOnOthers(PFNRTMPWORKER pfnWorker, void *pvUser1, void *pvUser2)
336{
337#ifdef CONFIG_SMP
338 IPRT_LINUX_SAVE_EFL_AC();
339 RTMPARGS Args;
340
341 RTTHREADPREEMPTSTATE PreemptState = RTTHREADPREEMPTSTATE_INITIALIZER;
342 Args.pfnWorker = pfnWorker;
343 Args.pvUser1 = pvUser1;
344 Args.pvUser2 = pvUser2;
345 Args.idCpu = NIL_RTCPUID;
346 Args.cHits = 0;
347
348 RTThreadPreemptDisable(&PreemptState);
349# if RTLNX_VER_MIN(5,3,0)
350 smp_call_function(rtmpLinuxWrapper, &Args, 1 /* wait */);
351# elif RTLNX_VER_MIN(2,6,27)
352 int rc = smp_call_function(rtmpLinuxWrapper, &Args, 1 /* wait */);
353 Assert(rc == 0); NOREF(rc);
354# else /* older kernels */
355 int rc = smp_call_function(rtmpLinuxWrapper, &Args, 0 /* retry */, 1 /* wait */);
356 Assert(rc == 0); NOREF(rc);
357# endif /* older kernels */
358 RTThreadPreemptRestore(&PreemptState);
359
360 IPRT_LINUX_RESTORE_EFL_AC();
361#else
362 RT_NOREF(pfnWorker, pvUser1, pvUser2);
363#endif
364 return VINF_SUCCESS;
365}
366RT_EXPORT_SYMBOL(RTMpOnOthers);
367
368
369#if RTLNX_VER_MAX(2,6,27) && defined(CONFIG_SMP)
370/**
371 * Wrapper between the native linux per-cpu callbacks and PFNRTWORKER
372 * employed by RTMpOnPair on older kernels that lacks smp_call_function_many.
373 *
374 * @param pvInfo Pointer to the RTMPARGS package.
375 */
376static void rtMpLinuxOnPairWrapper(void *pvInfo)
377{
378 PRTMPARGS pArgs = (PRTMPARGS)pvInfo;
379 RTCPUID idCpu = RTMpCpuId();
380
381 if ( idCpu == pArgs->idCpu
382 || idCpu == pArgs->idCpu2)
383 {
384 pArgs->pfnWorker(idCpu, pArgs->pvUser1, pArgs->pvUser2);
385 ASMAtomicIncU32(&pArgs->cHits);
386 }
387}
388#endif
389
390
391RTDECL(int) RTMpOnPair(RTCPUID idCpu1, RTCPUID idCpu2, uint32_t fFlags, PFNRTMPWORKER pfnWorker, void *pvUser1, void *pvUser2)
392{
393#ifdef CONFIG_SMP
394 IPRT_LINUX_SAVE_EFL_AC();
395 int rc;
396 RTTHREADPREEMPTSTATE PreemptState = RTTHREADPREEMPTSTATE_INITIALIZER;
397# if RTLNX_VER_MIN(2,6,28) /* 2.6.28 introduces CONFIG_CPUMASK_OFFSTACK */
398 cpumask_var_t DstCpuMask;
399# elif RTLNX_VER_MIN(2,6,27)
400 cpumask_t DstCpuMask;
401# endif
402
403 AssertReturn(idCpu1 != idCpu2, VERR_INVALID_PARAMETER);
404 AssertReturn(!(fFlags & RTMPON_F_VALID_MASK), VERR_INVALID_FLAGS);
405
406 /*
407 * Prepare the CPU mask before we disable preemption.
408 */
409# if RTLNX_VER_MIN(2,6,30)
410 if (!zalloc_cpumask_var(&DstCpuMask, GFP_KERNEL))
411 return VERR_NO_MEMORY;
412 cpumask_set_cpu(idCpu1, DstCpuMask);
413 cpumask_set_cpu(idCpu2, DstCpuMask);
414# elif RTLNX_VER_MIN(2,6,28)
415 if (!alloc_cpumask_var(&DstCpuMask, GFP_KERNEL))
416 return VERR_NO_MEMORY;
417 cpumask_clear(DstCpuMask);
418 cpumask_set_cpu(idCpu1, DstCpuMask);
419 cpumask_set_cpu(idCpu2, DstCpuMask);
420# elif RTLNX_VER_MIN(2,6,27)
421 cpus_clear(DstCpuMask);
422 cpu_set(idCpu1, DstCpuMask);
423 cpu_set(idCpu2, DstCpuMask);
424# endif
425
426 /*
427 * Check that both CPUs are online before doing the broadcast call.
428 */
429 RTThreadPreemptDisable(&PreemptState);
430 if ( RTMpIsCpuOnline(idCpu1)
431 && RTMpIsCpuOnline(idCpu2))
432 {
433 /*
434 * Use the smp_call_function variant taking a cpu mask where available,
435 * falling back on broadcast with filter. Slight snag if one of the
436 * CPUs is the one we're running on, we must do the call and the post
437 * call wait ourselves.
438 */
439 RTCPUID idCpuSelf = RTMpCpuId();
440 bool const fCallSelf = idCpuSelf == idCpu1 || idCpuSelf == idCpu2;
441 RTMPARGS Args;
442 Args.pfnWorker = pfnWorker;
443 Args.pvUser1 = pvUser1;
444 Args.pvUser2 = pvUser2;
445 Args.idCpu = idCpu1;
446 Args.idCpu2 = idCpu2;
447 Args.cHits = 0;
448
449# if RTLNX_VER_MIN(2,6,28)
450 smp_call_function_many(DstCpuMask, rtmpLinuxWrapperPostInc, &Args, !fCallSelf /* wait */);
451 rc = 0;
452# elif RTLNX_VER_MIN(2,6,27)
453 rc = smp_call_function_mask(DstCpuMask, rtmpLinuxWrapperPostInc, &Args, !fCallSelf /* wait */);
454# else /* older kernels */
455 rc = smp_call_function(rtMpLinuxOnPairWrapper, &Args, 0 /* retry */, !fCallSelf /* wait */);
456# endif /* older kernels */
457 Assert(rc == 0);
458
459 /* Call ourselves if necessary and wait for the other party to be done. */
460 if (fCallSelf)
461 {
462 uint32_t cLoops = 0;
463 rtmpLinuxWrapper(&Args);
464 while (ASMAtomicReadU32(&Args.cHits) < 2)
465 {
466 if ((cLoops & 0x1ff) == 0 && !RTMpIsCpuOnline(idCpuSelf == idCpu1 ? idCpu2 : idCpu1))
467 break;
468 cLoops++;
469 ASMNopPause();
470 }
471 }
472
473 Assert(Args.cHits <= 2);
474 if (Args.cHits == 2)
475 rc = VINF_SUCCESS;
476 else if (Args.cHits == 1)
477 rc = VERR_NOT_ALL_CPUS_SHOWED;
478 else if (Args.cHits == 0)
479 rc = VERR_CPU_OFFLINE;
480 else
481 rc = VERR_CPU_IPE_1;
482 }
483 /*
484 * A CPU must be present to be considered just offline.
485 */
486 else if ( RTMpIsCpuPresent(idCpu1)
487 && RTMpIsCpuPresent(idCpu2))
488 rc = VERR_CPU_OFFLINE;
489 else
490 rc = VERR_CPU_NOT_FOUND;
491
492 RTThreadPreemptRestore(&PreemptState);;
493# if RTLNX_VER_MIN(2,6,28)
494 free_cpumask_var(DstCpuMask);
495# endif
496 IPRT_LINUX_RESTORE_EFL_AC();
497 return rc;
498
499#else /* !CONFIG_SMP */
500 RT_NOREF(idCpu1, idCpu2, fFlags, pfnWorker, pvUser1, pvUser2);
501 return VERR_CPU_NOT_FOUND;
502#endif /* !CONFIG_SMP */
503}
504RT_EXPORT_SYMBOL(RTMpOnPair);
505
506
507RTDECL(bool) RTMpOnPairIsConcurrentExecSupported(void)
508{
509 return true;
510}
511RT_EXPORT_SYMBOL(RTMpOnPairIsConcurrentExecSupported);
512
513
514#if RTLNX_VER_MAX(2,6,19) && defined(CONFIG_SMP)
515/**
516 * Wrapper between the native linux per-cpu callbacks and PFNRTWORKER
517 * employed by RTMpOnSpecific on older kernels that lacks smp_call_function_single.
518 *
519 * @param pvInfo Pointer to the RTMPARGS package.
520 */
521static void rtmpOnSpecificLinuxWrapper(void *pvInfo)
522{
523 PRTMPARGS pArgs = (PRTMPARGS)pvInfo;
524 RTCPUID idCpu = RTMpCpuId();
525
526 if (idCpu == pArgs->idCpu)
527 {
528 pArgs->pfnWorker(idCpu, pArgs->pvUser1, pArgs->pvUser2);
529 ASMAtomicIncU32(&pArgs->cHits);
530 }
531}
532#endif
533
534
535RTDECL(int) RTMpOnSpecific(RTCPUID idCpu, PFNRTMPWORKER pfnWorker, void *pvUser1, void *pvUser2)
536{
537 IPRT_LINUX_SAVE_EFL_AC();
538 int rc;
539 RTMPARGS Args;
540
541 RTTHREADPREEMPTSTATE PreemptState = RTTHREADPREEMPTSTATE_INITIALIZER;
542 Args.pfnWorker = pfnWorker;
543 Args.pvUser1 = pvUser1;
544 Args.pvUser2 = pvUser2;
545 Args.idCpu = idCpu;
546 Args.cHits = 0;
547
548 if (!RTMpIsCpuPossible(idCpu))
549 return VERR_CPU_NOT_FOUND;
550
551 RTThreadPreemptDisable(&PreemptState);
552 if (idCpu != RTMpCpuId())
553 {
554#ifdef CONFIG_SMP
555 if (RTMpIsCpuOnline(idCpu))
556 {
557# if RTLNX_VER_MIN(2,6,27)
558 rc = smp_call_function_single(idCpu, rtmpLinuxWrapper, &Args, 1 /* wait */);
559# elif RTLNX_VER_MIN(2,6,19)
560 rc = smp_call_function_single(idCpu, rtmpLinuxWrapper, &Args, 0 /* retry */, 1 /* wait */);
561# else /* older kernels */
562 rc = smp_call_function(rtmpOnSpecificLinuxWrapper, &Args, 0 /* retry */, 1 /* wait */);
563# endif /* older kernels */
564 Assert(rc == 0);
565 rc = Args.cHits ? VINF_SUCCESS : VERR_CPU_OFFLINE;
566 }
567 else
568#endif /* CONFIG_SMP */
569 rc = VERR_CPU_OFFLINE;
570 }
571 else
572 {
573 rtmpLinuxWrapper(&Args);
574 rc = VINF_SUCCESS;
575 }
576 RTThreadPreemptRestore(&PreemptState);;
577
578 NOREF(rc);
579 IPRT_LINUX_RESTORE_EFL_AC();
580 return rc;
581}
582RT_EXPORT_SYMBOL(RTMpOnSpecific);
583
584
585#if RTLNX_VER_MIN(2,6,19) && defined(CONFIG_SMP)
586/**
587 * Dummy callback used by RTMpPokeCpu.
588 *
589 * @param pvInfo Ignored.
590 */
591static void rtmpLinuxPokeCpuCallback(void *pvInfo)
592{
593 NOREF(pvInfo);
594}
595#endif
596
597
598RTDECL(int) RTMpPokeCpu(RTCPUID idCpu)
599{
600#if RTLNX_VER_MIN(2,6,19)
601 IPRT_LINUX_SAVE_EFL_AC();
602 int rc;
603 if (RTMpIsCpuPossible(idCpu))
604 {
605 if (RTMpIsCpuOnline(idCpu))
606 {
607# ifdef CONFIG_SMP
608# if RTLNX_VER_MIN(2,6,27)
609 rc = smp_call_function_single(idCpu, rtmpLinuxPokeCpuCallback, NULL, 0 /* wait */);
610# elif RTLNX_VER_MIN(2,6,19)
611 rc = smp_call_function_single(idCpu, rtmpLinuxPokeCpuCallback, NULL, 0 /* retry */, 0 /* wait */);
612# else /* older kernels */
613# error oops
614# endif /* older kernels */
615 Assert(rc == 0);
616# endif /* CONFIG_SMP */
617 rc = VINF_SUCCESS;
618 }
619 else
620 rc = VERR_CPU_OFFLINE;
621 }
622 else
623 rc = VERR_CPU_NOT_FOUND;
624 IPRT_LINUX_RESTORE_EFL_AC();
625 return rc;
626
627#else /* older kernels */
628 /* no unicast here? */
629 return VERR_NOT_SUPPORTED;
630#endif /* older kernels */
631}
632RT_EXPORT_SYMBOL(RTMpPokeCpu);
633
634
635RTDECL(bool) RTMpOnAllIsConcurrentSafe(void)
636{
637 return true;
638}
639RT_EXPORT_SYMBOL(RTMpOnAllIsConcurrentSafe);
640
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