VBoxServiceCpuHotPlug.cpp@ 34079

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1	/* $Id: VBoxServiceCpuHotPlug.cpp 33468 2010-10-26 12:49:59Z vboxsync $ */
2	/** @file
3	* VBoxService - Guest Additions CPU Hot Plugging Service.
4	*/
5
6	/*
7	* Copyright (C) 2010 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	#endif
124
125	#ifdef RT_OS_LINUX
126	/**
127	* Probes for the correct path to the ACPI CPU object in sysfs for the
128	* various different kernel versions and distro's.
129	*
130	* @returns VBox status code.
131	*/
132	static int VBoxServiceCpuHotPlugProbePath(void)
133	{
134	int rc = VINF_SUCCESS;
135
136	/* Probe for the correct path if we didn't already. */
137	if (RT_UNLIKELY(g_aAcpiCpuPath[0].uId == ACPI_CPU_PATH_NOT_PROBED))
138	{
139	char pszPath = NULL; /* < Current path, increasing while we dig deeper. */
140
141	pszPath = RTStrDup(SYSFS_ACPI_CPU_PATH);
142	if (!pszPath)
143	return VERR_NO_MEMORY;
144
145	/*
146	* Simple algorithm to find the path.
147	* Performance is not a real problem because it is
148	* only executed once.
149	*/
150	for (unsigned iLvlCurr = 0; iLvlCurr < RT_ELEMENTS(g_aAcpiCpuPath); iLvlCurr++)
151	{
152	PSYSFSCPUPATH pAcpiCpuPathLvl = &g_aAcpiCpuPath[iLvlCurr];
153
154	for (unsigned iCompCurr = 0; iCompCurr < pAcpiCpuPathLvl->cComponents; iCompCurr++)
155	{
156	PCSYSFSCPUPATHCOMP pPathComponent = &pAcpiCpuPathLvl->aComponentsPossible[iCompCurr];
157
158	/* Open the directory */
159	PRTDIR pDirCurr = NULL;
160	char *pszPathTmp = RTPathJoinA(pszPath, pPathComponent->pcszName);
161	if (pszPathTmp)
162	{
163	rc = RTDirOpenFiltered(&pDirCurr, pszPathTmp, RTDIRFILTER_WINNT);
164	RTStrFree(pszPathTmp);
165	}
166	else
167	rc = VERR_NO_STR_MEMORY;
168	if (RT_FAILURE(rc))
169	break;
170
171	/* Search if the current directory contains one of the possible parts. */
172	size_t cchName = strlen(pPathComponent->pcszName);
173	RTDIRENTRY DirFolderContent;
174	bool fFound = false;
175	while (RT_SUCCESS(RTDirRead(pDirCurr, &DirFolderContent, NULL))) /* Assumption that szName has always enough space */
176	{
177	if ( DirFolderContent.cbName >= cchName
178	&& !strncmp(DirFolderContent.szName, pPathComponent->pcszName, cchName))
179	{
180	/* Found, use the complete name to dig deeper. */
181	fFound = true;
182	pAcpiCpuPathLvl->uId = iCompCurr;
183	char *pszPathLvl = RTPathJoinA(pszPath, DirFolderContent.szName);
184	if (pszPathLvl)
185	{
186	RTStrFree(pszPath);
187	pszPath = pszPathLvl;
188	}
189	else
190	rc = VERR_NO_STR_MEMORY;
191	break;
192	}
193	}
194	RTDirClose(pDirCurr);
195
196	if (fFound)
197	break;
198	} /* For every possible component. */
199
200	/* No matching component for this part, no need to continue */
201	if (RT_FAILURE(rc))
202	break;
203	} /* For every level */
204
205	VBoxServiceVerbose(1, "Final path after probing %s rc=%Rrc\n", pszPath, rc);
206	RTStrFree(pszPath);
207	}
208
209	return rc;
210	}
211
212	/**
213	* Returns the path of the ACPI CPU device with the given core and package ID.
214	*
215	* @returns VBox status code.
216	* @param ppszPath Where to store the path.
217	* @param idCpuCore The core ID of the CPU.
218	* @param idCpuPackage The package ID of the CPU.
219	*/
220	static int VBoxServiceCpuHotPlugGetACPIDevicePath(char **ppszPath, uint32_t idCpuCore, uint32_t idCpuPackage)
221	{
222	int rc = VINF_SUCCESS;
223
224	AssertPtrReturn(ppszPath, VERR_INVALID_PARAMETER);
225
226	rc = VBoxServiceCpuHotPlugProbePath();
227	if (RT_SUCCESS(rc))
228	{
229	/* Build the path from all components. */
230	bool fFound = false;
231	unsigned iLvlCurr = 0;
232	char *pszPath = NULL;
233	char *pszPathDir = NULL;
234	PSYSFSCPUPATH pAcpiCpuPathLvl = &g_aAcpiCpuPath[iLvlCurr];
235
236	/* Init everything. */
237	Assert(pAcpiCpuPathLvl->uId != ACPI_CPU_PATH_NOT_PROBED);
238	pszPath = RTPathJoinA(SYSFS_ACPI_CPU_PATH, pAcpiCpuPathLvl->aComponentsPossible[pAcpiCpuPathLvl->uId].pcszName);
239	if (!pszPath)
240	return VERR_NO_STR_MEMORY;
241
242	pAcpiCpuPathLvl->pszPath = RTStrDup(SYSFS_ACPI_CPU_PATH);
243	if (!pAcpiCpuPathLvl->pszPath)
244	{
245	RTStrFree(pszPath);
246	return VERR_NO_STR_MEMORY;
247	}
248
249	/* Open the directory */
250	rc = RTDirOpenFiltered(&pAcpiCpuPathLvl->pDir, pszPath, RTDIRFILTER_WINNT);
251	if (RT_SUCCESS(rc))
252	{
253	RTStrFree(pszPath);
254
255	/* Search for CPU */
256	while (!fFound)
257	{
258	/* Get the next directory. */
259	RTDIRENTRY DirFolderContent;
260	rc = RTDirRead(pAcpiCpuPathLvl->pDir, &DirFolderContent, NULL);
261	if (RT_SUCCESS(rc))
262	{
263	/* Create the new path. */
264	char *pszPathCurr = RTPathJoinA(pAcpiCpuPathLvl->pszPath, DirFolderContent.szName);
265	if (!pszPathCurr)
266	{
267	rc = VERR_NO_STR_MEMORY;
268	break;
269	}
270
271	/* If this is the last level check for the given core and package id. */
272	if (iLvlCurr == RT_ELEMENTS(g_aAcpiCpuPath) - 1)
273	{
274	/* Get the sysdev */
275	uint32_t idCore = RTLinuxSysFsReadIntFile(10, "%s/sysdev/topology/core_id",
276	pszPathCurr);
277	uint32_t idPackage = RTLinuxSysFsReadIntFile(10, "%s/sysdev/topology/physical_package_id",
278	pszPathCurr);
279	if ( idCore == idCpuCore
280	&& idPackage == idCpuPackage)
281	{
282	/* Return the path */
283	pszPath = pszPathCurr;
284	fFound = true;
285	VBoxServiceVerbose(3, "CPU found\n");
286	break;
287	}
288	else
289	{
290	/* Get the next directory. */
291	RTStrFree(pszPathCurr);
292	VBoxServiceVerbose(3, "CPU doesn't match, next directory\n");
293	}
294	}
295	else
296	{
297	/* Go deeper */
298	iLvlCurr++;
299
300	VBoxServiceVerbose(3, "Going deeper (iLvlCurr=%u)\n", iLvlCurr);
301
302	pAcpiCpuPathLvl = &g_aAcpiCpuPath[iLvlCurr];
303
304	Assert(!pAcpiCpuPathLvl->pDir);
305	Assert(!pAcpiCpuPathLvl->pszPath);
306	pAcpiCpuPathLvl->pszPath = pszPathCurr;
307	PCSYSFSCPUPATHCOMP pPathComponent = &pAcpiCpuPathLvl->aComponentsPossible[pAcpiCpuPathLvl->uId];
308
309	Assert(pAcpiCpuPathLvl->uId != ACPI_CPU_PATH_NOT_PROBED);
310
311	pszPathDir = RTPathJoinA(pszPathCurr, pPathComponent->pcszName);
312	if (!pszPathDir)
313	{
314	rc = VERR_NO_STR_MEMORY;
315	break;
316	}
317
318	VBoxServiceVerbose(3, "New path %s\n", pszPathDir);
319
320	/* Open the directory */
321	rc = RTDirOpenFiltered(&pAcpiCpuPathLvl->pDir, pszPathDir, RTDIRFILTER_WINNT);
322	if (RT_FAILURE(rc))
323	break;
324	}
325	}
326	else
327	{
328	/* Go back one level and try to get the next entry. */
329	Assert(iLvlCurr > 0);
330
331	RTDirClose(pAcpiCpuPathLvl->pDir);
332	RTStrFree(pAcpiCpuPathLvl->pszPath);
333	pAcpiCpuPathLvl->pDir = NULL;
334	pAcpiCpuPathLvl->pszPath = NULL;
335
336	iLvlCurr--;
337	pAcpiCpuPathLvl = &g_aAcpiCpuPath[iLvlCurr];
338	VBoxServiceVerbose(3, "Directory not found, going back (iLvlCurr=%u)\n", iLvlCurr);
339	}
340	} /* while not found */
341	} /* Successful init */
342
343	/* Cleanup */
344	for (unsigned i = 0; i < RT_ELEMENTS(g_aAcpiCpuPath); i++)
345	{
346	if (g_aAcpiCpuPath[i].pDir)
347	RTDirClose(g_aAcpiCpuPath[i].pDir);
348	if (g_aAcpiCpuPath[i].pszPath)
349	RTStrFree(g_aAcpiCpuPath[i].pszPath);
350	g_aAcpiCpuPath[i].pDir = NULL;
351	g_aAcpiCpuPath[i].pszPath = NULL;
352	}
353	if (pszPathDir)
354	RTStrFree(pszPathDir);
355	if (RT_FAILURE(rc) && pszPath)
356	RTStrFree(pszPath);
357
358	if (RT_SUCCESS(rc))
359	*ppszPath = pszPath;
360	}
361
362	return rc;
363	}
364	#endif /* RT_OS_LINUX */
365
366
367	/** @copydoc VBOXSERVICE::pfnPreInit */
368	static DECLCALLBACK(int) VBoxServiceCpuHotPlugPreInit(void)
369	{
370	return VINF_SUCCESS;
371	}
372
373
374	/** @copydoc VBOXSERVICE::pfnOption */
375	static DECLCALLBACK(int) VBoxServiceCpuHotPlugOption(const char ppszShort, int argc, char argv, int *pi)
376	{
377	NOREF(ppszShort);
378	NOREF(argc);
379	NOREF(argv);
380	NOREF(pi);
381	return VINF_SUCCESS;
382	}
383
384
385	/** @copydoc VBOXSERVICE::pfnInit */
386	static DECLCALLBACK(int) VBoxServiceCpuHotPlugInit(void)
387	{
388	return VINF_SUCCESS;
389	}
390
391
392	/**
393	* Handles VMMDevCpuEventType_Plug.
394	*
395	* @param idCpuCore The CPU core ID.
396	* @param idCpuPackage The CPU package ID.
397	*/
398	static void VBoxServiceCpuHotPlugHandlePlugEvent(uint32_t idCpuCore, uint32_t idCpuPackage)
399	{
400	#ifdef RT_OS_LINUX
401	/*
402	* The topology directory (containing the physical and core id properties)
403	* is not available until the CPU is online. So we just iterate over all directories
404	* and enable every CPU which is not online already.
405	* Because the directory might not be available immediately we try a few times.
406	*
407	* @todo: Maybe use udev to monitor hot-add events from the kernel
408	*/
409	bool fCpuOnline = false;
410	unsigned cTries = 5;
411
412	do
413	{
414	PRTDIR pDirDevices = NULL;
415	int rc = RTDirOpen(&pDirDevices, SYSFS_CPU_PATH);
416	if (RT_SUCCESS(rc))
417	{
418	RTDIRENTRY DirFolderContent;
419	while (RT_SUCCESS(RTDirRead(pDirDevices, &DirFolderContent, NULL))) /* Assumption that szName has always enough space */
420	{
421	/** @todo r-bird: This code is bringing all CPUs online; the idCpuCore and
422	* idCpuPackage parameters are unused!
423	* aeichner: These files are not available at this point unfortunately. (see comment above)
424	* bird: Yes, but isn't that easily dealt with by doing:
425	* if (matching_topology() \|\| !have_topology_directory())
426	* bring_cpu_online()
427	* That could save you the cpu0 and cpuidle checks to.
428	*/
429	/*
430	* Check if this is a CPU object.
431	* cpu0 is excluded because it is not possible to change the state
432	* of the first CPU on Linux (it doesn't even have an online file)
433	* and cpuidle is no CPU device. Prevents error messages later.
434	*/
435	if( !strncmp(DirFolderContent.szName, "cpu", 3)
436	&& strncmp(DirFolderContent.szName, "cpu0", 4)
437	&& strncmp(DirFolderContent.szName, "cpuidle", 7))
438	{
439	/* Get the sysdev */
440	RTFILE hFileCpuOnline = NIL_RTFILE;
441
442	rc = RTFileOpenF(&hFileCpuOnline, RTFILE_O_WRITE \| RTFILE_O_OPEN \| RTFILE_O_DENY_NONE,
443	"%s/%s/online", SYSFS_CPU_PATH, DirFolderContent.szName);
444	if (RT_SUCCESS(rc))
445	{
446	/* Write a 1 to online the CPU */
447	rc = RTFileWrite(hFileCpuOnline, "1", 1, NULL);
448	RTFileClose(hFileCpuOnline);
449	if (RT_SUCCESS(rc))
450	{
451	VBoxServiceVerbose(1, "CpuHotPlug: CPU %u/%u was brought online\n", idCpuPackage, idCpuCore);
452	fCpuOnline = true;
453	break;
454	}
455	/* Error means CPU not present or online already */
456	}
457	else
458	VBoxServiceError("CpuHotPlug: Failed to open \"%s/%s/online\" rc=%Rrc\n",
459	SYSFS_CPU_PATH, DirFolderContent.szName, rc);
460	}
461	}
462	}
463	else
464	VBoxServiceError("CpuHotPlug: Failed to open path %s rc=%Rrc\n", SYSFS_CPU_PATH, rc);
465
466	/* Sleep a bit */
467	if (!fCpuOnline)
468	RTThreadSleep(10);
469
470	} while ( !fCpuOnline
471	&& cTries-- > 0);
472	#else
473	# error "Port me"
474	#endif
475	}
476
477
478	/**
479	* Handles VMMDevCpuEventType_Unplug.
480	*
481	* @param idCpuCore The CPU core ID.
482	* @param idCpuPackage The CPU package ID.
483	*/
484	static void VBoxServiceCpuHotPlugHandleUnplugEvent(uint32_t idCpuCore, uint32_t idCpuPackage)
485	{
486	#ifdef RT_OS_LINUX
487	char *pszCpuDevicePath = NULL;
488	int rc = VBoxServiceCpuHotPlugGetACPIDevicePath(&pszCpuDevicePath, idCpuCore, idCpuPackage);
489	if (RT_SUCCESS(rc))
490	{
491	RTFILE hFileCpuEject;
492	rc = RTFileOpenF(&hFileCpuEject, RTFILE_O_WRITE \| RTFILE_O_OPEN \| RTFILE_O_DENY_NONE,
493	"%s/eject", pszCpuDevicePath);
494	if (RT_SUCCESS(rc))
495	{
496	/* Write a 1 to eject the CPU */
497	rc = RTFileWrite(hFileCpuEject, "1", 1, NULL);
498	if (RT_SUCCESS(rc))
499	VBoxServiceVerbose(1, "CpuHotPlug: CPU %u/%u was ejected\n", idCpuPackage, idCpuCore);
500	else
501	VBoxServiceError("CpuHotPlug: Failed to eject CPU %u/%u rc=%Rrc\n", idCpuPackage, idCpuCore, rc);
502
503	RTFileClose(hFileCpuEject);
504	}
505	else
506	VBoxServiceError("CpuHotPlug: Failed to open \"%s/eject\" rc=%Rrc\n", pszCpuDevicePath, rc);
507	RTStrFree(pszCpuDevicePath);
508	}
509	else
510	VBoxServiceError("CpuHotPlug: Failed to get CPU device path rc=%Rrc\n", rc);
511	#else
512	# error "Port me"
513	#endif
514	}
515
516
517	/** @copydoc VBOXSERVICE::pfnWorker */
518	DECLCALLBACK(int) VBoxServiceCpuHotPlugWorker(bool volatile *pfShutdown)
519	{
520	/*
521	* Tell the control thread that it can continue spawning services.
522	*/
523	RTThreadUserSignal(RTThreadSelf());
524
525	/*
526	* Enable the CPU hotplug notifier.
527	*/
528	int rc = VbglR3CpuHotPlugInit();
529	if (RT_FAILURE(rc))
530	return rc;
531
532	/*
533	* The Work Loop.
534	*/
535	for (;;)
536	{
537	/* Wait for CPU hot plugging event. */
538	uint32_t idCpuCore;
539	uint32_t idCpuPackage;
540	VMMDevCpuEventType enmEventType;
541	rc = VbglR3CpuHotPlugWaitForEvent(&enmEventType, &idCpuCore, &idCpuPackage);
542	if (RT_SUCCESS(rc))
543	{
544	VBoxServiceVerbose(3, "CpuHotPlug: Event happened idCpuCore=%u idCpuPackage=%u enmEventType=%d\n",
545	idCpuCore, idCpuPackage, enmEventType);
546	switch (enmEventType)
547	{
548	case VMMDevCpuEventType_Plug:
549	VBoxServiceCpuHotPlugHandlePlugEvent(idCpuCore, idCpuPackage);
550	break;
551
552	case VMMDevCpuEventType_Unplug:
553	VBoxServiceCpuHotPlugHandleUnplugEvent(idCpuCore, idCpuPackage);
554	break;
555
556	default:
557	{
558	static uint32_t s_iErrors = 0;
559	if (s_iErrors++ < 10)
560	VBoxServiceError("CpuHotPlug: Unknown event: idCpuCore=%u idCpuPackage=%u enmEventType=%d\n",
561	idCpuCore, idCpuPackage, enmEventType);
562	break;
563	}
564	}
565	}
566	else if (rc != VERR_INTERRUPTED && rc != VERR_TRY_AGAIN)
567	{
568	VBoxServiceError("CpuHotPlug: VbglR3CpuHotPlugWaitForEvent returned %Rrc\n", rc);
569	break;
570	}
571
572	if (*pfShutdown)
573	break;
574	}
575
576	VbglR3CpuHotPlugTerm();
577	return rc;
578	}
579
580
581	/** @copydoc VBOXSERVICE::pfnStop */
582	static DECLCALLBACK(void) VBoxServiceCpuHotPlugStop(void)
583	{
584	VbglR3InterruptEventWaits();
585	return;
586	}
587
588
589	/** @copydoc VBOXSERVICE::pfnTerm */
590	static DECLCALLBACK(void) VBoxServiceCpuHotPlugTerm(void)
591	{
592	return;
593	}
594
595
596	/**
597	* The 'timesync' 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	VBoxServiceCpuHotPlugPreInit,
611	VBoxServiceCpuHotPlugOption,
612	VBoxServiceCpuHotPlugInit,
613	VBoxServiceCpuHotPlugWorker,
614	VBoxServiceCpuHotPlugStop,
615	VBoxServiceCpuHotPlugTerm
616	};
617

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source: vbox/trunk/src/VBox/Additions/common/VBoxService/VBoxServiceCpuHotPlug.cpp@ 34079

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