VBoxServiceCpuHotPlug.cpp@ 52890

Last change on this file since 52890 was 51570, checked in by vboxsync, 11 years ago
Additions/common/VBoxService: provide default/null object implementations for service call-back functions.
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1	/* $Id: VBoxServiceCpuHotPlug.cpp 51570 2014-06-06 15:53:52Z vboxsync $ */
2	/** @file
3	* VBoxService - Guest Additions CPU Hot Plugging Service.
4	*/
5
6	/*
7	* Copyright (C) 2010-2012 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
18	/*******************************************************************************
19	* Header Files *
20	*******************************************************************************/
21	#include <iprt/assert.h>
22	#include <iprt/dir.h>
23	#include <iprt/file.h>
24	#include <iprt/mem.h>
25	#include <iprt/path.h>
26	#include <iprt/string.h>
27	#include <iprt/thread.h>
28	#include <VBox/VBoxGuestLib.h>
29	#include "VBoxServiceInternal.h"
30
31	#ifdef RT_OS_LINUX
32	# include <iprt/linux/sysfs.h>
33	# include <errno.h> /* For the sysfs API */
34	#endif
35
36
37	/*******************************************************************************
38	* Defined Constants And Macros *
39	*******************************************************************************/
40	#ifdef RT_OS_LINUX
41	/** @name Paths to access the CPU device
42	* @{
43	*/
44	# define SYSFS_ACPI_CPU_PATH "/sys/devices"
45	# define SYSFS_CPU_PATH "/sys/devices/system/cpu"
46	/** @} */
47
48	/** Path component for the ACPI CPU path. */
49	typedef struct SYSFSCPUPATHCOMP
50	{
51	/** Flag whether the name is suffixed with a number */
52	bool fNumberedSuffix;
53	/** Name of the component */
54	const char *pcszName;
55	} SYSFSCPUPATHCOMP, *PSYSFSCPUPATHCOMP;
56	/** Pointer to a const component. */
57	typedef const SYSFSCPUPATHCOMP *PCSYSFSCPUPATHCOMP;
58
59	/**
60	* Structure which defines how the entries are assembled.
61	*/
62	typedef struct SYSFSCPUPATH
63	{
64	/** Id when probing for the correct path. */
65	uint32_t uId;
66	/** Array holding the possible components. */
67	PCSYSFSCPUPATHCOMP aComponentsPossible;
68	/** Number of entries in the array, excluding the terminator. */
69	unsigned cComponents;
70	/** Directory handle */
71	PRTDIR pDir;
72	/** Current directory to try. */
73	char *pszPath;
74	} SYSFSCPUPATH, *PSYSFSCPUPATH;
75
76	/** Content of uId if the path wasn't probed yet. */
77	#define ACPI_CPU_PATH_NOT_PROBED UINT32_MAX
78
79	/** Possible combinations of all path components for level 1. */
80	const SYSFSCPUPATHCOMP g_aAcpiCpuPathLvl1[] =
81	{
82	/** LNXSYSTEM:<id> */
83	{true, "LNXSYSTM:*"}
84	};
85
86	/** Possible combinations of all path components for level 2. */
87	const SYSFSCPUPATHCOMP g_aAcpiCpuPathLvl2[] =
88	{
89	/** device:<id> */
90	{true, "device:*"},
91	/** LNXSYBUS:<id> */
92	{true, "LNXSYBUS:*"}
93	};
94
95	/** Possible combinations of all path components for level 3 */
96	const SYSFSCPUPATHCOMP g_aAcpiCpuPathLvl3[] =
97	{
98	/** ACPI0004:<id> */
99	{true, "ACPI0004:*"}
100	};
101
102	/** Possible combinations of all path components for level 4 */
103	const SYSFSCPUPATHCOMP g_aAcpiCpuPathLvl4[] =
104	{
105	/** LNXCPU:<id> */
106	{true, "LNXCPU:*"},
107	/** ACPI_CPU:<id> */
108	{true, "ACPI_CPU:*"}
109	};
110
111	/** All possible combinations. */
112	SYSFSCPUPATH g_aAcpiCpuPath[] =
113	{
114	/** Level 1 */
115	{ACPI_CPU_PATH_NOT_PROBED, g_aAcpiCpuPathLvl1, RT_ELEMENTS(g_aAcpiCpuPathLvl1), NULL, NULL},
116	/** Level 2 */
117	{ACPI_CPU_PATH_NOT_PROBED, g_aAcpiCpuPathLvl2, RT_ELEMENTS(g_aAcpiCpuPathLvl2), NULL, NULL},
118	/** Level 3 */
119	{ACPI_CPU_PATH_NOT_PROBED, g_aAcpiCpuPathLvl3, RT_ELEMENTS(g_aAcpiCpuPathLvl3), NULL, NULL},
120	/** Level 4 */
121	{ACPI_CPU_PATH_NOT_PROBED, g_aAcpiCpuPathLvl4, RT_ELEMENTS(g_aAcpiCpuPathLvl4), NULL, NULL},
122	};
123
124	/**
125	* Possible directories to get to the topology directory for reading core and package id.
126	*
127	* @remark: This is not part of the path above because the eject file is not in one of the directories
128	* below and would make the hot unplug code fail.
129	*/
130	const char *g_apszTopologyPath[] =
131	{
132	"sysdev",
133	"physical_node"
134	};
135	#endif
136
137	#ifdef RT_OS_LINUX
138	/**
139	* Probes for the correct path to the ACPI CPU object in sysfs for the
140	* various different kernel versions and distro's.
141	*
142	* @returns VBox status code.
143	*/
144	static int VBoxServiceCpuHotPlugProbePath(void)
145	{
146	int rc = VINF_SUCCESS;
147
148	/* Probe for the correct path if we didn't already. */
149	if (RT_UNLIKELY(g_aAcpiCpuPath[0].uId == ACPI_CPU_PATH_NOT_PROBED))
150	{
151	char pszPath = NULL; /* < Current path, increasing while we dig deeper. */
152
153	pszPath = RTStrDup(SYSFS_ACPI_CPU_PATH);
154	if (!pszPath)
155	return VERR_NO_MEMORY;
156
157	/*
158	* Simple algorithm to find the path.
159	* Performance is not a real problem because it is
160	* only executed once.
161	*/
162	for (unsigned iLvlCurr = 0; iLvlCurr < RT_ELEMENTS(g_aAcpiCpuPath); iLvlCurr++)
163	{
164	PSYSFSCPUPATH pAcpiCpuPathLvl = &g_aAcpiCpuPath[iLvlCurr];
165
166	for (unsigned iCompCurr = 0; iCompCurr < pAcpiCpuPathLvl->cComponents; iCompCurr++)
167	{
168	PCSYSFSCPUPATHCOMP pPathComponent = &pAcpiCpuPathLvl->aComponentsPossible[iCompCurr];
169
170	/* Open the directory */
171	PRTDIR pDirCurr = NULL;
172	char *pszPathTmp = RTPathJoinA(pszPath, pPathComponent->pcszName);
173	if (pszPathTmp)
174	{
175	rc = RTDirOpenFiltered(&pDirCurr, pszPathTmp, RTDIRFILTER_WINNT, 0);
176	RTStrFree(pszPathTmp);
177	}
178	else
179	rc = VERR_NO_STR_MEMORY;
180	if (RT_FAILURE(rc))
181	break;
182
183	/* Search if the current directory contains one of the possible parts. */
184	size_t cchName = strlen(pPathComponent->pcszName);
185	RTDIRENTRY DirFolderContent;
186	bool fFound = false;
187
188	/* Get rid of the * filter which is in the path component. */
189	if (pPathComponent->fNumberedSuffix)
190	cchName--;
191
192	while (RT_SUCCESS(RTDirRead(pDirCurr, &DirFolderContent, NULL))) /* Assumption that szName has always enough space */
193	{
194	if ( DirFolderContent.cbName >= cchName
195	&& !strncmp(DirFolderContent.szName, pPathComponent->pcszName, cchName))
196	{
197	/* Found, use the complete name to dig deeper. */
198	fFound = true;
199	pAcpiCpuPathLvl->uId = iCompCurr;
200	char *pszPathLvl = RTPathJoinA(pszPath, DirFolderContent.szName);
201	if (pszPathLvl)
202	{
203	RTStrFree(pszPath);
204	pszPath = pszPathLvl;
205	}
206	else
207	rc = VERR_NO_STR_MEMORY;
208	break;
209	}
210	}
211	RTDirClose(pDirCurr);
212
213	if (fFound)
214	break;
215	} /* For every possible component. */
216
217	/* No matching component for this part, no need to continue */
218	if (RT_FAILURE(rc))
219	break;
220	} /* For every level */
221
222	VBoxServiceVerbose(1, "Final path after probing %s rc=%Rrc\n", pszPath, rc);
223	RTStrFree(pszPath);
224	}
225
226	return rc;
227	}
228
229	/**
230	* Returns the path of the ACPI CPU device with the given core and package ID.
231	*
232	* @returns VBox status code.
233	* @param ppszPath Where to store the path.
234	* @param idCpuCore The core ID of the CPU.
235	* @param idCpuPackage The package ID of the CPU.
236	*/
237	static int VBoxServiceCpuHotPlugGetACPIDevicePath(char **ppszPath, uint32_t idCpuCore, uint32_t idCpuPackage)
238	{
239	int rc = VINF_SUCCESS;
240
241	AssertPtrReturn(ppszPath, VERR_INVALID_PARAMETER);
242
243	rc = VBoxServiceCpuHotPlugProbePath();
244	if (RT_SUCCESS(rc))
245	{
246	/* Build the path from all components. */
247	bool fFound = false;
248	unsigned iLvlCurr = 0;
249	char *pszPath = NULL;
250	char *pszPathDir = NULL;
251	PSYSFSCPUPATH pAcpiCpuPathLvl = &g_aAcpiCpuPath[iLvlCurr];
252
253	/* Init everything. */
254	Assert(pAcpiCpuPathLvl->uId != ACPI_CPU_PATH_NOT_PROBED);
255	pszPath = RTPathJoinA(SYSFS_ACPI_CPU_PATH, pAcpiCpuPathLvl->aComponentsPossible[pAcpiCpuPathLvl->uId].pcszName);
256	if (!pszPath)
257	return VERR_NO_STR_MEMORY;
258
259	pAcpiCpuPathLvl->pszPath = RTStrDup(SYSFS_ACPI_CPU_PATH);
260	if (!pAcpiCpuPathLvl->pszPath)
261	{
262	RTStrFree(pszPath);
263	return VERR_NO_STR_MEMORY;
264	}
265
266	/* Open the directory */
267	rc = RTDirOpenFiltered(&pAcpiCpuPathLvl->pDir, pszPath, RTDIRFILTER_WINNT, 0);
268	if (RT_SUCCESS(rc))
269	{
270	RTStrFree(pszPath);
271
272	/* Search for CPU */
273	while (!fFound)
274	{
275	/* Get the next directory. */
276	RTDIRENTRY DirFolderContent;
277	rc = RTDirRead(pAcpiCpuPathLvl->pDir, &DirFolderContent, NULL);
278	if (RT_SUCCESS(rc))
279	{
280	/* Create the new path. */
281	char *pszPathCurr = RTPathJoinA(pAcpiCpuPathLvl->pszPath, DirFolderContent.szName);
282	if (!pszPathCurr)
283	{
284	rc = VERR_NO_STR_MEMORY;
285	break;
286	}
287
288	/* If this is the last level check for the given core and package id. */
289	if (iLvlCurr == RT_ELEMENTS(g_aAcpiCpuPath) - 1)
290	{
291	/* Get the sysdev */
292	uint32_t idCore = 0;
293	uint32_t idPackage = 0;
294
295	for (unsigned i = 0; i < RT_ELEMENTS(g_apszTopologyPath); i++)
296	{
297	int64_t i64Core = RTLinuxSysFsReadIntFile(10, "%s/%s/topology/core_id",
298	pszPathCurr, g_apszTopologyPath[i]);
299	int64_t i64Package = RTLinuxSysFsReadIntFile(10, "%s/%s/topology/physical_package_id",
300	pszPathCurr, g_apszTopologyPath[i]);
301
302	if ( i64Core != -1
303	&& i64Package != -1)
304	{
305	idCore = (uint32_t)i64Core;
306	idPackage = (uint32_t)i64Package;
307	break;
308	}
309	}
310
311	if ( idCore == idCpuCore
312	&& idPackage == idCpuPackage)
313	{
314	/* Return the path */
315	pszPath = pszPathCurr;
316	fFound = true;
317	VBoxServiceVerbose(3, "CPU found\n");
318	break;
319	}
320	else
321	{
322	/* Get the next directory. */
323	RTStrFree(pszPathCurr);
324	VBoxServiceVerbose(3, "CPU doesn't match, next directory\n");
325	}
326	}
327	else
328	{
329	/* Go deeper */
330	iLvlCurr++;
331
332	VBoxServiceVerbose(3, "Going deeper (iLvlCurr=%u)\n", iLvlCurr);
333
334	pAcpiCpuPathLvl = &g_aAcpiCpuPath[iLvlCurr];
335
336	Assert(!pAcpiCpuPathLvl->pDir);
337	Assert(!pAcpiCpuPathLvl->pszPath);
338	pAcpiCpuPathLvl->pszPath = pszPathCurr;
339	PCSYSFSCPUPATHCOMP pPathComponent = &pAcpiCpuPathLvl->aComponentsPossible[pAcpiCpuPathLvl->uId];
340
341	Assert(pAcpiCpuPathLvl->uId != ACPI_CPU_PATH_NOT_PROBED);
342
343	pszPathDir = RTPathJoinA(pszPathCurr, pPathComponent->pcszName);
344	if (!pszPathDir)
345	{
346	rc = VERR_NO_STR_MEMORY;
347	break;
348	}
349
350	VBoxServiceVerbose(3, "New path %s\n", pszPathDir);
351
352	/* Open the directory */
353	rc = RTDirOpenFiltered(&pAcpiCpuPathLvl->pDir, pszPathDir, RTDIRFILTER_WINNT, 0);
354	if (RT_FAILURE(rc))
355	break;
356	}
357	}
358	else
359	{
360	/* Go back one level and try to get the next entry. */
361	Assert(iLvlCurr > 0);
362
363	RTDirClose(pAcpiCpuPathLvl->pDir);
364	RTStrFree(pAcpiCpuPathLvl->pszPath);
365	pAcpiCpuPathLvl->pDir = NULL;
366	pAcpiCpuPathLvl->pszPath = NULL;
367
368	iLvlCurr--;
369	pAcpiCpuPathLvl = &g_aAcpiCpuPath[iLvlCurr];
370	VBoxServiceVerbose(3, "Directory not found, going back (iLvlCurr=%u)\n", iLvlCurr);
371	}
372	} /* while not found */
373	} /* Successful init */
374
375	/* Cleanup */
376	for (unsigned i = 0; i < RT_ELEMENTS(g_aAcpiCpuPath); i++)
377	{
378	if (g_aAcpiCpuPath[i].pDir)
379	RTDirClose(g_aAcpiCpuPath[i].pDir);
380	if (g_aAcpiCpuPath[i].pszPath)
381	RTStrFree(g_aAcpiCpuPath[i].pszPath);
382	g_aAcpiCpuPath[i].pDir = NULL;
383	g_aAcpiCpuPath[i].pszPath = NULL;
384	}
385	if (pszPathDir)
386	RTStrFree(pszPathDir);
387	if (RT_FAILURE(rc) && pszPath)
388	RTStrFree(pszPath);
389
390	if (RT_SUCCESS(rc))
391	*ppszPath = pszPath;
392	}
393
394	return rc;
395	}
396	#endif /* RT_OS_LINUX */
397
398
399	/**
400	* Handles VMMDevCpuEventType_Plug.
401	*
402	* @param idCpuCore The CPU core ID.
403	* @param idCpuPackage The CPU package ID.
404	*/
405	static void VBoxServiceCpuHotPlugHandlePlugEvent(uint32_t idCpuCore, uint32_t idCpuPackage)
406	{
407	#ifdef RT_OS_LINUX
408	/*
409	* The topology directory (containing the physical and core id properties)
410	* is not available until the CPU is online. So we just iterate over all directories
411	* and enable every CPU which is not online already.
412	* Because the directory might not be available immediately we try a few times.
413	*
414	* @todo: Maybe use udev to monitor hot-add events from the kernel
415	*/
416	bool fCpuOnline = false;
417	unsigned cTries = 5;
418
419	do
420	{
421	PRTDIR pDirDevices = NULL;
422	int rc = RTDirOpen(&pDirDevices, SYSFS_CPU_PATH);
423	if (RT_SUCCESS(rc))
424	{
425	RTDIRENTRY DirFolderContent;
426	while (RT_SUCCESS(RTDirRead(pDirDevices, &DirFolderContent, NULL))) /* Assumption that szName has always enough space */
427	{
428	/** @todo r-bird: This code is bringing all CPUs online; the idCpuCore and
429	* idCpuPackage parameters are unused!
430	* aeichner: These files are not available at this point unfortunately. (see comment above)
431	* bird: Yes, but isn't that easily dealt with by doing:
432	* if (matching_topology() \|\| !have_topology_directory())
433	* bring_cpu_online()
434	* That could save you the cpu0 and cpuidle checks to.
435	*/
436	/*
437	* Check if this is a CPU object.
438	* cpu0 is excluded because it is not possible to change the state
439	* of the first CPU on Linux (it doesn't even have an online file)
440	* and cpuidle is no CPU device. Prevents error messages later.
441	*/
442	if( !strncmp(DirFolderContent.szName, "cpu", 3)
443	&& strncmp(DirFolderContent.szName, "cpu0", 4)
444	&& strncmp(DirFolderContent.szName, "cpuidle", 7))
445	{
446	/* Get the sysdev */
447	RTFILE hFileCpuOnline = NIL_RTFILE;
448
449	rc = RTFileOpenF(&hFileCpuOnline, RTFILE_O_WRITE \| RTFILE_O_OPEN \| RTFILE_O_DENY_NONE,
450	"%s/%s/online", SYSFS_CPU_PATH, DirFolderContent.szName);
451	if (RT_SUCCESS(rc))
452	{
453	/* Write a 1 to online the CPU */
454	rc = RTFileWrite(hFileCpuOnline, "1", 1, NULL);
455	RTFileClose(hFileCpuOnline);
456	if (RT_SUCCESS(rc))
457	{
458	VBoxServiceVerbose(1, "CpuHotPlug: CPU %u/%u was brought online\n", idCpuPackage, idCpuCore);
459	fCpuOnline = true;
460	break;
461	}
462	/* Error means CPU not present or online already */
463	}
464	else
465	VBoxServiceError("CpuHotPlug: Failed to open \"%s/%s/online\" rc=%Rrc\n",
466	SYSFS_CPU_PATH, DirFolderContent.szName, rc);
467	}
468	}
469	}
470	else
471	VBoxServiceError("CpuHotPlug: Failed to open path %s rc=%Rrc\n", SYSFS_CPU_PATH, rc);
472
473	/* Sleep a bit */
474	if (!fCpuOnline)
475	RTThreadSleep(10);
476
477	} while ( !fCpuOnline
478	&& cTries-- > 0);
479	#else
480	# error "Port me"
481	#endif
482	}
483
484
485	/**
486	* Handles VMMDevCpuEventType_Unplug.
487	*
488	* @param idCpuCore The CPU core ID.
489	* @param idCpuPackage The CPU package ID.
490	*/
491	static void VBoxServiceCpuHotPlugHandleUnplugEvent(uint32_t idCpuCore, uint32_t idCpuPackage)
492	{
493	#ifdef RT_OS_LINUX
494	char *pszCpuDevicePath = NULL;
495	int rc = VBoxServiceCpuHotPlugGetACPIDevicePath(&pszCpuDevicePath, idCpuCore, idCpuPackage);
496	if (RT_SUCCESS(rc))
497	{
498	RTFILE hFileCpuEject;
499	rc = RTFileOpenF(&hFileCpuEject, RTFILE_O_WRITE \| RTFILE_O_OPEN \| RTFILE_O_DENY_NONE,
500	"%s/eject", pszCpuDevicePath);
501	if (RT_SUCCESS(rc))
502	{
503	/* Write a 1 to eject the CPU */
504	rc = RTFileWrite(hFileCpuEject, "1", 1, NULL);
505	if (RT_SUCCESS(rc))
506	VBoxServiceVerbose(1, "CpuHotPlug: CPU %u/%u was ejected\n", idCpuPackage, idCpuCore);
507	else
508	VBoxServiceError("CpuHotPlug: Failed to eject CPU %u/%u rc=%Rrc\n", idCpuPackage, idCpuCore, rc);
509
510	RTFileClose(hFileCpuEject);
511	}
512	else
513	VBoxServiceError("CpuHotPlug: Failed to open \"%s/eject\" rc=%Rrc\n", pszCpuDevicePath, rc);
514	RTStrFree(pszCpuDevicePath);
515	}
516	else
517	VBoxServiceError("CpuHotPlug: Failed to get CPU device path rc=%Rrc\n", rc);
518	#else
519	# error "Port me"
520	#endif
521	}
522
523
524	/** @copydoc VBOXSERVICE::pfnWorker */
525	DECLCALLBACK(int) VBoxServiceCpuHotPlugWorker(bool volatile *pfShutdown)
526	{
527	/*
528	* Tell the control thread that it can continue spawning services.
529	*/
530	RTThreadUserSignal(RTThreadSelf());
531
532	/*
533	* Enable the CPU hotplug notifier.
534	*/
535	int rc = VbglR3CpuHotPlugInit();
536	if (RT_FAILURE(rc))
537	return rc;
538
539	/*
540	* The Work Loop.
541	*/
542	for (;;)
543	{
544	/* Wait for CPU hot plugging event. */
545	uint32_t idCpuCore;
546	uint32_t idCpuPackage;
547	VMMDevCpuEventType enmEventType;
548	rc = VbglR3CpuHotPlugWaitForEvent(&enmEventType, &idCpuCore, &idCpuPackage);
549	if (RT_SUCCESS(rc))
550	{
551	VBoxServiceVerbose(3, "CpuHotPlug: Event happened idCpuCore=%u idCpuPackage=%u enmEventType=%d\n",
552	idCpuCore, idCpuPackage, enmEventType);
553	switch (enmEventType)
554	{
555	case VMMDevCpuEventType_Plug:
556	VBoxServiceCpuHotPlugHandlePlugEvent(idCpuCore, idCpuPackage);
557	break;
558
559	case VMMDevCpuEventType_Unplug:
560	VBoxServiceCpuHotPlugHandleUnplugEvent(idCpuCore, idCpuPackage);
561	break;
562
563	default:
564	{
565	static uint32_t s_iErrors = 0;
566	if (s_iErrors++ < 10)
567	VBoxServiceError("CpuHotPlug: Unknown event: idCpuCore=%u idCpuPackage=%u enmEventType=%d\n",
568	idCpuCore, idCpuPackage, enmEventType);
569	break;
570	}
571	}
572	}
573	else if (rc != VERR_INTERRUPTED && rc != VERR_TRY_AGAIN)
574	{
575	VBoxServiceError("CpuHotPlug: VbglR3CpuHotPlugWaitForEvent returned %Rrc\n", rc);
576	break;
577	}
578
579	if (*pfShutdown)
580	break;
581	}
582
583	VbglR3CpuHotPlugTerm();
584	return rc;
585	}
586
587
588	/** @copydoc VBOXSERVICE::pfnStop */
589	static DECLCALLBACK(void) VBoxServiceCpuHotPlugStop(void)
590	{
591	VbglR3InterruptEventWaits();
592	return;
593	}
594
595
596	/**
597	* The 'CpuHotPlug' service description.
598	*/
599	VBOXSERVICE g_CpuHotPlug =
600	{
601	/* pszName. */
602	"cpuhotplug",
603	/* pszDescription. */
604	"CPU hot plugging monitor",
605	/* pszUsage. */
606	NULL,
607	/* pszOptions. */
608	NULL,
609	/* methods */
610	VBoxServiceDefaultPreInit,
611	VBoxServiceDefaultOption,
612	VBoxServiceDefaultInit,
613	VBoxServiceCpuHotPlugWorker,
614	VBoxServiceCpuHotPlugStop,
615	VBoxServiceDefaultTerm
616	};
617

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source: vbox/trunk/src/VBox/Additions/common/VBoxService/VBoxServiceCpuHotPlug.cpp@ 52890

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