DBGFR3SampleReport.cpp

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1	/* $Id: DBGFR3SampleReport.cpp 106061 2024-09-16 14:03:52Z vboxsync $ */
2	/** @file
3	* DBGF - Debugger Facility, Sample report creation.
4	*/
5
6	/*
7	* Copyright (C) 2021-2024 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	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28
29	/** @page pg_dbgf_sample_report DBGFR3SampleReport - Sample Report Interface
30	*
31	* @todo
32	*/
33
34
35	/*********************************************************************************************************************************
36	* Header Files *
37	*********************************************************************************************************************************/
38	#define LOG_GROUP LOG_GROUP_DBGF
39	#include <VBox/vmm/dbgf.h>
40	#include "DBGFInternal.h"
41	#include <VBox/vmm/mm.h>
42	#include <VBox/vmm/uvm.h>
43	#include <VBox/vmm/vm.h>
44	#include <VBox/err.h>
45	#include <VBox/log.h>
46
47	#include <iprt/assert.h>
48	#include <iprt/semaphore.h>
49	#include <iprt/list.h>
50	#include <iprt/mem.h>
51	#include <iprt/time.h>
52	#include <iprt/timer.h>
53	#include <iprt/sort.h>
54	#include <iprt/string.h>
55	#include <iprt/stream.h>
56
57
58	/*********************************************************************************************************************************
59	* Defined Constants And Macros *
60	*********************************************************************************************************************************/
61
62	/** Maximum stack frame depth. */
63	#define DBGF_SAMPLE_REPORT_FRAME_DEPTH_MAX 64
64
65
66	/*********************************************************************************************************************************
67	* Structures and Typedefs *
68	*********************************************************************************************************************************/
69
70	/**
71	* Sample report state.
72	*/
73	typedef enum DBGFSAMPLEREPORTSTATE
74	{
75	/** Invalid state do not use. */
76	DBGFSAMPLEREPORTSTATE_INVALID = 0,
77	/** The sample report is ready to run. */
78	DBGFSAMPLEREPORTSTATE_READY,
79	/** The sampple process is running currently. */
80	DBGFSAMPLEREPORTSTATE_RUNNING,
81	/** The sample process is about to stop. */
82	DBGFSAMPLEREPORTSTATE_STOPPING,
83	/** 32bit hack. */
84	DBGFSAMPLEREPORTSTATE_32BIT_HACK = 0x7fffffff
85	} DBGFSAMPLEREPORTSTATE;
86
87	/** Pointer to a single sample frame. */
88	typedef struct DBGFSAMPLEFRAME *PDBGFSAMPLEFRAME;
89
90	/**
91	* Frame information.
92	*/
93	typedef struct DBGFSAMPLEFRAME
94	{
95	/** Frame address. */
96	DBGFADDRESS AddrFrame;
97	/** Number of times this frame was encountered. */
98	uint64_t cSamples;
99	/** Pointer to the array of frames below in the call stack. */
100	PDBGFSAMPLEFRAME paFrames;
101	/** Number of valid entries in the frams array. */
102	uint64_t cFramesValid;
103	/** Maximum number of entries in the frames array. */
104	uint64_t cFramesMax;
105	} DBGFSAMPLEFRAME;
106	typedef const DBGFSAMPLEFRAME *PCDBGFSAMPLEFRAME;
107
108
109	/**
110	* Per VCPU sample report data.
111	*/
112	typedef struct DBGFSAMPLEREPORTVCPU
113	{
114	/** The root frame. */
115	DBGFSAMPLEFRAME FrameRoot;
116	} DBGFSAMPLEREPORTVCPU;
117	/** Pointer to the per VCPU sample report data. */
118	typedef DBGFSAMPLEREPORTVCPU *PDBGFSAMPLEREPORTVCPU;
119	/** Pointer to const per VCPU sample report data. */
120	typedef const DBGFSAMPLEREPORTVCPU *PCDBGFSAMPLEREPORTVCPU;
121
122
123	/**
124	* Internal sample report instance data.
125	*/
126	typedef struct DBGFSAMPLEREPORTINT
127	{
128	/** References hold for this trace module. */
129	volatile uint32_t cRefs;
130	/** The user mode VM handle. */
131	PUVM pUVM;
132	/** State the sample report is currently in. */
133	volatile DBGFSAMPLEREPORTSTATE enmState;
134	/** Flags passed during report creation. */
135	uint32_t fFlags;
136	/** The timer handle for the sample report collector. */
137	PRTTIMER hTimer;
138	/** The sample interval in microseconds. */
139	uint32_t cSampleIntervalUs;
140	/** THe progress callback if set. */
141	PFNDBGFPROGRESS pfnProgress;
142	/** Opaque user data passed with the progress callback. */
143	void *pvProgressUser;
144	/** Number of microseconds left for sampling. */
145	uint64_t cSampleUsLeft;
146	/** The report created after sampling was stopped. */
147	char *pszReport;
148	/** Number of EMTs having a guest sample operation queued. */
149	volatile uint32_t cEmtsActive;
150	/** Array of per VCPU samples collected. */
151	DBGFSAMPLEREPORTVCPU aCpus[1];
152	} DBGFSAMPLEREPORTINT;
153	/** Pointer to a const internal trace module instance data. */
154	typedef DBGFSAMPLEREPORTINT *PDBGFSAMPLEREPORTINT;
155	/** Pointer to a const internal trace module instance data. */
156	typedef const DBGFSAMPLEREPORTINT *PCDBGFSAMPLEREPORTINT;
157
158
159	/**
160	* Structure to pass to DBGFR3Info() and for doing all other
161	* output during fatal dump.
162	*/
163	typedef struct DBGFSAMPLEREPORTINFOHLP
164	{
165	/** The helper core. */
166	DBGFINFOHLP Core;
167	/** Pointer to the allocated character buffer. */
168	char *pachBuf;
169	/** Number of bytes allocated for the character buffer. */
170	size_t cbBuf;
171	/** Offset into the character buffer. */
172	size_t offBuf;
173	} DBGFSAMPLEREPORTINFOHLP, *PDBGFSAMPLEREPORTINFOHLP;
174	/** Pointer to a DBGFSAMPLEREPORTINFOHLP structure. */
175	typedef const DBGFSAMPLEREPORTINFOHLP *PCDBGFSAMPLEREPORTINFOHLP;
176
177
178	/*********************************************************************************************************************************
179	* Internal Functions *
180	*********************************************************************************************************************************/
181
182	/**
183	* Print formatted string.
184	*
185	* @param pHlp Pointer to this structure.
186	* @param pszFormat The format string.
187	* @param ... Arguments.
188	*/
189	static DECLCALLBACK(void) dbgfR3SampleReportInfoHlp_pfnPrintf(PCDBGFINFOHLP pHlp, const char *pszFormat, ...)
190	{
191	va_list args;
192	va_start(args, pszFormat);
193	pHlp->pfnPrintfV(pHlp, pszFormat, args);
194	va_end(args);
195	}
196
197
198	/**
199	* Print formatted string.
200	*
201	* @param pHlp Pointer to this structure.
202	* @param pszFormat The format string.
203	* @param args Argument list.
204	*/
205	static DECLCALLBACK(void) dbgfR3SampleReportInfoHlp_pfnPrintfV(PCDBGFINFOHLP pHlp, const char *pszFormat, va_list args)
206	{
207	PDBGFSAMPLEREPORTINFOHLP pMyHlp = (PDBGFSAMPLEREPORTINFOHLP)pHlp;
208
209	va_list args2;
210	va_copy(args2, args);
211	ssize_t cch = RTStrPrintf2V(&pMyHlp->pachBuf[pMyHlp->offBuf], pMyHlp->cbBuf - pMyHlp->offBuf, pszFormat, args2);
212	if (cch < 0)
213	{
214	/* Try increase the buffer. */
215	char pachBufNew = (char )RTMemRealloc(pMyHlp->pachBuf, pMyHlp->cbBuf + RT_MAX(_4K, -cch));
216	if (pachBufNew)
217	{
218	pMyHlp->pachBuf = pachBufNew;
219	pMyHlp->cbBuf += RT_MAX(_4K, -cch);
220	cch = RTStrPrintf2V(&pMyHlp->pachBuf[pMyHlp->offBuf], pMyHlp->cbBuf - pMyHlp->offBuf, pszFormat, args2);
221	Assert(cch > 0);
222	pMyHlp->offBuf += cch;
223	}
224	}
225	else
226	pMyHlp->offBuf += cch;
227	va_end(args2);
228	}
229
230
231	/**
232	* Initializes the sample report output helper.
233	*
234	* @param pHlp The structure to initialize.
235	*/
236	static void dbgfR3SampleReportInfoHlpInit(PDBGFSAMPLEREPORTINFOHLP pHlp)
237	{
238	RT_BZERO(pHlp, sizeof(*pHlp));
239
240	pHlp->Core.pfnPrintf = dbgfR3SampleReportInfoHlp_pfnPrintf;
241	pHlp->Core.pfnPrintfV = dbgfR3SampleReportInfoHlp_pfnPrintfV;
242	pHlp->Core.pfnGetOptError = DBGFR3InfoGenericGetOptError;
243
244	pHlp->pachBuf = (char *)RTMemAllocZ(_4K);
245	if (pHlp->pachBuf)
246	pHlp->cbBuf = _4K;
247	}
248
249
250	/**
251	* Deletes the sample report output helper.
252	*
253	* @param pHlp The structure to delete.
254	*/
255	static void dbgfR3SampleReportInfoHlpDelete(PDBGFSAMPLEREPORTINFOHLP pHlp)
256	{
257	if (pHlp->pachBuf)
258	RTMemFree(pHlp->pachBuf);
259	}
260
261
262	/**
263	* Frees the given frame and all its descendants.
264	*
265	* @param pFrame The frame to free.
266	*/
267	static void dbgfR3SampleReportFrameFree(PDBGFSAMPLEFRAME pFrame)
268	{
269	for (uint32_t i = 0; i < pFrame->cFramesValid; i++)
270	dbgfR3SampleReportFrameFree(&pFrame->paFrames[i]); /** @todo Recursion... */
271
272	MMR3HeapFree(pFrame->paFrames);
273	memset(pFrame, 0, sizeof(*pFrame));
274	}
275
276
277	/**
278	* Destroys the given sample report freeing all allocated resources.
279	*
280	* @param pThis The sample report instance data.
281	*/
282	static void dbgfR3SampleReportDestroy(PDBGFSAMPLEREPORTINT pThis)
283	{
284	for (uint32_t i = 0; i < pThis->pUVM->cCpus; i++)
285	dbgfR3SampleReportFrameFree(&pThis->aCpus[i].FrameRoot);
286	MMR3HeapFree(pThis);
287	}
288
289
290	/**
291	* Returns the frame belonging to the given address or NULL if not found.
292	*
293	* @returns Pointer to the descendant frame or NULL if not found.
294	* @param pFrame The frame to look for descendants with the matching address.
295	* @param pAddr The guest address to search for.
296	*/
297	static PDBGFSAMPLEFRAME dbgfR3SampleReportFrameFindByAddr(PCDBGFSAMPLEFRAME pFrame, PCDBGFADDRESS pAddr)
298	{
299	for (uint32_t i = 0; i < pFrame->cFramesValid; i++)
300	if (!memcmp(pAddr, &pFrame->paFrames[i].AddrFrame, sizeof(*pAddr)))
301	return &pFrame->paFrames[i];
302
303	return NULL;
304	}
305
306
307	/**
308	* Adds the given address to as a descendant to the given frame.
309	*
310	* @returns Pointer to the newly inserted frame identified by the given address.
311	* @param pUVM The usermode VM handle.
312	* @param pFrame The frame to add the new one to as a descendant.
313	* @param pAddr The guest address to add.
314	*/
315	static PDBGFSAMPLEFRAME dbgfR3SampleReportAddFrameByAddr(PUVM pUVM, PDBGFSAMPLEFRAME pFrame, PCDBGFADDRESS pAddr)
316	{
317	if (pFrame->cFramesValid == pFrame->cFramesMax)
318	{
319	uint32_t cFramesMaxNew = pFrame->cFramesMax + 10;
320	PDBGFSAMPLEFRAME paFramesNew = NULL;
321	if (pFrame->paFrames)
322	paFramesNew = (PDBGFSAMPLEFRAME)MMR3HeapRealloc(pFrame->paFrames, sizeof(pFrame->paFrames) cFramesMaxNew);
323	else
324	paFramesNew = (PDBGFSAMPLEFRAME)MMR3HeapAllocZU(pUVM, MM_TAG_DBGF, sizeof(pFrame->paFrames) cFramesMaxNew);
325
326	if (!paFramesNew)
327	return NULL;
328
329	pFrame->cFramesMax = cFramesMaxNew;
330	pFrame->paFrames = paFramesNew;
331	}
332
333	PDBGFSAMPLEFRAME pFrameNew = &pFrame->paFrames[pFrame->cFramesValid++];
334	pFrameNew->AddrFrame = *pAddr;
335	pFrameNew->cSamples = 1;
336	pFrameNew->paFrames = NULL;
337	pFrameNew->cFramesMax = 0;
338	pFrameNew->cFramesValid = 0;
339	return pFrameNew;
340	}
341
342
343	/**
344	* @copydoc FNRTSORTCMP
345	*/
346	static DECLCALLBACK(int) dbgfR3SampleReportFrameSortCmp(void const pvElement1, void const pvElement2, void *pvUser)
347	{
348	RT_NOREF(pvUser);
349	PCDBGFSAMPLEFRAME pFrame1 = (PCDBGFSAMPLEFRAME)pvElement1;
350	PCDBGFSAMPLEFRAME pFrame2 = (PCDBGFSAMPLEFRAME)pvElement2;
351
352	if (pFrame1->cSamples < pFrame2->cSamples)
353	return 1;
354	if (pFrame1->cSamples > pFrame2->cSamples)
355	return -1;
356
357	return 0;
358	}
359
360
361	/**
362	* Dumps a single given frame to the release log.
363	*
364	* @param pHlp The debug info helper used for printing.
365	* @param pUVM The usermode VM handle.
366	* @param pFrame The frame to dump.
367	* @param idxFrame The frame number.
368	*/
369	static void dbgfR3SampleReportDumpFrame(PCDBGFINFOHLP pHlp, PUVM pUVM, PCDBGFSAMPLEFRAME pFrame, uint32_t idxFrame)
370	{
371	RTGCINTPTR offDisp;
372	RTDBGMOD hMod;
373	RTDBGSYMBOL SymPC;
374
375	if (DBGFR3AddrIsValid(pUVM, &pFrame->AddrFrame))
376	{
377	int rc = DBGFR3AsSymbolByAddr(pUVM, DBGF_AS_GLOBAL, &pFrame->AddrFrame,
378	RTDBGSYMADDR_FLAGS_LESS_OR_EQUAL \| RTDBGSYMADDR_FLAGS_SKIP_ABS_IN_DEFERRED,
379	&offDisp, &SymPC, &hMod);
380	if (RT_SUCCESS(rc))
381	{
382	const char *pszModName = hMod != NIL_RTDBGMOD ? RTDbgModName(hMod) : NULL;
383
384	pHlp->pfnPrintf(pHlp,
385	"%s%RU64 %s+%llx (%s) [%RGv]\n", idxFrame 4, " ",
386	pFrame->cSamples,
387	SymPC.szName, offDisp,
388	hMod ? pszModName : "",
389	pFrame->AddrFrame.FlatPtr);
390	RTDbgModRelease(hMod);
391	}
392	else
393	pHlp->pfnPrintf(pHlp, "%s%RU64 %RGv\n", idxFrame 4, " ", pFrame->cSamples, pFrame->AddrFrame.FlatPtr);
394	}
395	else
396	pHlp->pfnPrintf(pHlp, "%s%RU64 %RGv\n", idxFrame 4, " ", pFrame->cSamples, pFrame->AddrFrame.FlatPtr);
397
398	/* Sort by sample count. */
399	RTSortShell(pFrame->paFrames, pFrame->cFramesValid, sizeof(*pFrame->paFrames), dbgfR3SampleReportFrameSortCmp, NULL);
400
401	for (uint32_t i = 0; i < pFrame->cFramesValid; i++)
402	dbgfR3SampleReportDumpFrame(pHlp, pUVM, &pFrame->paFrames[i], idxFrame + 1);
403	}
404
405
406	/**
407	* Worker for dbgfR3SampleReportTakeSample(), doing the work in an EMT rendezvous point on
408	* each VCPU.
409	*
410	* @param pThis Pointer to the sample report instance.
411	*/
412	static DECLCALLBACK(void) dbgfR3SampleReportSample(PDBGFSAMPLEREPORTINT pThis)
413	{
414	PVM pVM = pThis->pUVM->pVM;
415	PVMCPU pVCpu = VMMGetCpu(pVM);
416
417	PCDBGFSTACKFRAME pFrameFirst;
418	int rc = DBGFR3StackWalkBegin(pThis->pUVM, pVCpu->idCpu, DBGFCODETYPE_GUEST, &pFrameFirst);
419	if (RT_SUCCESS(rc))
420	{
421	DBGFADDRESS aFrameAddresses[DBGF_SAMPLE_REPORT_FRAME_DEPTH_MAX];
422	uint32_t idxFrame = 0;
423
424	PDBGFSAMPLEFRAME pFrame = &pThis->aCpus[pVCpu->idCpu].FrameRoot;
425	pFrame->cSamples++;
426
427	for (PCDBGFSTACKFRAME pStackFrame = pFrameFirst;
428	pStackFrame && idxFrame < RT_ELEMENTS(aFrameAddresses);
429	pStackFrame = DBGFR3StackWalkNext(pStackFrame))
430	{
431	if (pThis->fFlags & DBGF_SAMPLE_REPORT_F_STACK_REVERSE)
432	{
433	PDBGFSAMPLEFRAME pFrameNext = dbgfR3SampleReportFrameFindByAddr(pFrame, &pStackFrame->AddrPC);
434	if (!pFrameNext)
435	pFrameNext = dbgfR3SampleReportAddFrameByAddr(pThis->pUVM, pFrame, &pStackFrame->AddrPC);
436	else
437	pFrameNext->cSamples++;
438
439	pFrame = pFrameNext;
440	}
441	else
442	aFrameAddresses[idxFrame] = pStackFrame->AddrPC;
443
444	idxFrame++;
445	}
446
447	DBGFR3StackWalkEnd(pFrameFirst);
448
449	if (!(pThis->fFlags & DBGF_SAMPLE_REPORT_F_STACK_REVERSE))
450	{
451	/* Walk the frame stack backwards and construct the call stack. */
452	while (idxFrame--)
453	{
454	PDBGFSAMPLEFRAME pFrameNext = dbgfR3SampleReportFrameFindByAddr(pFrame, &aFrameAddresses[idxFrame]);
455	if (!pFrameNext)
456	pFrameNext = dbgfR3SampleReportAddFrameByAddr(pThis->pUVM, pFrame, &aFrameAddresses[idxFrame]);
457	else
458	pFrameNext->cSamples++;
459
460	pFrame = pFrameNext;
461	}
462	}
463	}
464	else
465	LogRelMax(10, ("Sampling guest stack on VCPU %u failed with rc=%Rrc\n", pVCpu->idCpu, rc));
466
467	/* Last EMT finishes the report when sampling was stopped. */
468	uint32_t cEmtsActive = ASMAtomicDecU32(&pThis->cEmtsActive);
469	if ( ASMAtomicReadU32((volatile uint32_t *)&pThis->enmState) == DBGFSAMPLEREPORTSTATE_STOPPING
470	&& !cEmtsActive)
471	{
472	rc = RTTimerDestroy(pThis->hTimer); AssertRC(rc); RT_NOREF(rc);
473	pThis->hTimer = NULL;
474
475	DBGFSAMPLEREPORTINFOHLP Hlp;
476	PCDBGFINFOHLP pHlp = &Hlp.Core;
477
478	dbgfR3SampleReportInfoHlpInit(&Hlp);
479
480	/* Some early dump code. */
481	for (uint32_t i = 0; i < pThis->pUVM->cCpus; i++)
482	{
483	PCDBGFSAMPLEREPORTVCPU pSampleVCpu = &pThis->aCpus[i];
484
485	pHlp->pfnPrintf(pHlp, "Sample report for vCPU %u:\n", i);
486	dbgfR3SampleReportDumpFrame(pHlp, pThis->pUVM, &pSampleVCpu->FrameRoot, 0);
487	}
488
489	/* Shameless copy from VMMGuruMeditation.cpp */
490	static struct
491	{
492	const char *pszInfo;
493	const char *pszArgs;
494	} const aInfo[] =
495	{
496	{ "mappings", NULL },
497	{ "mode", "all" },
498	{ "handlers", "phys virt hyper stats" },
499	{ "timers", NULL },
500	{ "activetimers", NULL },
501	};
502	for (unsigned i = 0; i < RT_ELEMENTS(aInfo); i++)
503	{
504	pHlp->pfnPrintf(pHlp,
505	"!!\n"
506	"!! {%s, %s}\n"
507	"!!\n",
508	aInfo[i].pszInfo, aInfo[i].pszArgs);
509	DBGFR3Info(pVM->pUVM, aInfo[i].pszInfo, aInfo[i].pszArgs, pHlp);
510	}
511
512	/* All other info items */
513	DBGFR3InfoMulti(pVM,
514	"*",
515	"mappings\|hma\|cpum\|cpumguest\|cpumguesthwvirt\|cpumguestinstr\|cpumhyper\|cpumhost\|cpumvmxfeat\|mode\|cpuid"
516	"\|pgmpd\|pgmcr3\|timers\|activetimers\|handlers\|help\|cfgm",
517	"!!\n"
518	"!! {%s}\n"
519	"!!\n",
520	pHlp);
521
522
523	/* done */
524	pHlp->pfnPrintf(pHlp,
525	"!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n");
526
527	if (pThis->pszReport)
528	RTMemFree(pThis->pszReport);
529	pThis->pszReport = Hlp.pachBuf;
530	Hlp.pachBuf = NULL;
531	dbgfR3SampleReportInfoHlpDelete(&Hlp);
532
533	ASMAtomicXchgU32((volatile uint32_t *)&pThis->enmState, DBGFSAMPLEREPORTSTATE_READY);
534
535	if (pThis->pfnProgress)
536	{
537	pThis->pfnProgress(pThis->pvProgressUser, 100);
538	pThis->pfnProgress = NULL;
539	pThis->pvProgressUser = NULL;
540	}
541
542	DBGFR3SampleReportRelease(pThis);
543	}
544	}
545
546
547	/**
548	* @copydoc FNRTTIMER
549	*/
550	static DECLCALLBACK(void) dbgfR3SampleReportTakeSample(PRTTIMER pTimer, void *pvUser, uint64_t iTick)
551	{
552	PDBGFSAMPLEREPORTINT pThis = (PDBGFSAMPLEREPORTINT)pvUser;
553
554	if (pThis->cSampleUsLeft != UINT32_MAX)
555	{
556	int rc = VINF_SUCCESS;
557	uint64_t cUsSampled = iTick * pThis->cSampleIntervalUs; /** @todo Wrong if the timer resolution is different from what we've requested. */
558
559	/* Update progress. */
560	if (pThis->pfnProgress)
561	rc = pThis->pfnProgress(pThis->pvProgressUser, cUsSampled * 99 / pThis->cSampleUsLeft);
562
563	if ( cUsSampled >= pThis->cSampleUsLeft
564	\|\| rc == VERR_DBGF_CANCELLED)
565	{
566	/*
567	* Let the EMTs do one last round in order to be able to destroy the timer (can't do this on the timer thread)
568	* and gather information from the devices.
569	*/
570	ASMAtomicCmpXchgU32((volatile uint32_t *)&pThis->enmState, DBGFSAMPLEREPORTSTATE_STOPPING,
571	DBGFSAMPLEREPORTSTATE_RUNNING);
572
573	rc = RTTimerStop(pTimer); AssertRC(rc); RT_NOREF(rc);
574	}
575	}
576
577	ASMAtomicAddU32(&pThis->cEmtsActive, pThis->pUVM->cCpus);
578
579	for (uint32_t i = 0; i < pThis->pUVM->cCpus; i++)
580	{
581	int rc = VMR3ReqCallVoidNoWait(pThis->pUVM->pVM, i, (PFNRT)dbgfR3SampleReportSample, 1, pThis);
582	AssertRC(rc);
583	if (RT_FAILURE(rc))
584	ASMAtomicDecU32(&pThis->cEmtsActive);
585	}
586	}
587
588
589	/**
590	* Creates a new sample report instance for the specified VM.
591	*
592	* @returns VBox status code.
593	* @param pUVM The usermode VM handle.
594	* @param cSampleIntervalUs The sample interval in micro seconds.
595	* @param fFlags Combination of DBGF_SAMPLE_REPORT_F_XXX.
596	* @param phSample Where to return the handle to the sample report on success.
597	*/
598	VMMR3DECL(int) DBGFR3SampleReportCreate(PUVM pUVM, uint32_t cSampleIntervalUs, uint32_t fFlags, PDBGFSAMPLEREPORT phSample)
599	{
600	UVM_ASSERT_VALID_EXT_RETURN(pUVM, VERR_INVALID_VM_HANDLE);
601	AssertReturn(!(fFlags & ~DBGF_SAMPLE_REPORT_F_VALID_MASK), VERR_INVALID_PARAMETER);
602	AssertPtrReturn(phSample, VERR_INVALID_POINTER);
603
604	int rc = VINF_SUCCESS;
605	PDBGFSAMPLEREPORTINT pThis = (PDBGFSAMPLEREPORTINT)MMR3HeapAllocZU(pUVM, MM_TAG_DBGF,
606	RT_UOFFSETOF_DYN(DBGFSAMPLEREPORTINT, aCpus[pUVM->cCpus]));
607	if (RT_LIKELY(pThis))
608	{
609	pThis->cRefs = 1;
610	pThis->pUVM = pUVM;
611	pThis->fFlags = fFlags;
612	pThis->cSampleIntervalUs = cSampleIntervalUs;
613	pThis->enmState = DBGFSAMPLEREPORTSTATE_READY;
614	pThis->cEmtsActive = 0;
615
616	for (uint32_t i = 0; i < pUVM->cCpus; i++)
617	{
618	pThis->aCpus[i].FrameRoot.paFrames = NULL;
619	pThis->aCpus[i].FrameRoot.cSamples = 0;
620	pThis->aCpus[i].FrameRoot.cFramesValid = 0;
621	pThis->aCpus[i].FrameRoot.cFramesMax = 0;
622	}
623
624	*phSample = pThis;
625	return VINF_SUCCESS;
626	}
627	else
628	rc = VERR_NO_MEMORY;
629
630	return rc;
631	}
632
633
634	/**
635	* Retains a reference to the given sample report handle.
636	*
637	* @returns New reference count.
638	* @param hSample Sample report handle.
639	*/
640	VMMR3DECL(uint32_t) DBGFR3SampleReportRetain(DBGFSAMPLEREPORT hSample)
641	{
642	PDBGFSAMPLEREPORTINT pThis = hSample;
643	AssertPtrReturn(pThis, UINT32_MAX);
644
645	uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
646	AssertMsg(cRefs > 1 && cRefs < _1M, ("%#x %p\n", cRefs, pThis));
647	return cRefs;
648	}
649
650
651	/**
652	* Release a given sample report handle reference.
653	*
654	* @returns New reference count, on 0 the sample report instance is destroyed.
655	* @param hSample Sample report handle.
656	*/
657	VMMR3DECL(uint32_t) DBGFR3SampleReportRelease(DBGFSAMPLEREPORT hSample)
658	{
659	PDBGFSAMPLEREPORTINT pThis = hSample;
660	if (!pThis)
661	return 0;
662	AssertPtrReturn(pThis, UINT32_MAX);
663	AssertReturn(ASMAtomicReadU32((volatile uint32_t *)&pThis->enmState) == DBGFSAMPLEREPORTSTATE_READY,
664	0);
665
666	uint32_t cRefs = ASMAtomicDecU32(&pThis->cRefs);
667	AssertMsg(cRefs < _1M, ("%#x %p\n", cRefs, pThis));
668	if (cRefs == 0)
669	dbgfR3SampleReportDestroy(pThis);
670	return cRefs;
671	}
672
673
674	/**
675	* Starts collecting samples for the given sample report.
676	*
677	* @returns VBox status code.
678	* @param hSample Sample report handle.
679	* @param cSampleUs Number of microseconds to sample at the interval given during creation.
680	* Use UINT32_MAX to sample for an indefinite amount of time.
681	* @param pfnProgress Optional progress callback.
682	* @param pvUser Opaque user data to pass to the progress callback.
683	*/
684	VMMR3DECL(int) DBGFR3SampleReportStart(DBGFSAMPLEREPORT hSample, uint64_t cSampleUs, PFNDBGFPROGRESS pfnProgress, void *pvUser)
685	{
686	PDBGFSAMPLEREPORTINT pThis = hSample;
687
688	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
689	AssertReturn(ASMAtomicCmpXchgU32((volatile uint32_t *)&pThis->enmState, DBGFSAMPLEREPORTSTATE_RUNNING, DBGFSAMPLEREPORTSTATE_READY),
690	VERR_INVALID_STATE);
691
692	pThis->pfnProgress = pfnProgress;
693	pThis->pvProgressUser = pvUser;
694	pThis->cSampleUsLeft = cSampleUs;
695
696	/* Try to detect the guest OS first so we can get more accurate symbols and addressing. */
697	char szName[64];
698	int rc = DBGFR3OSDetect(pThis->pUVM, &szName[0], sizeof(szName));
699	if (RT_SUCCESS(rc))
700	{
701	LogRel(("DBGF/SampleReport: Detected guest OS \"%s\"\n", szName));
702	char szVersion[512];
703	int rc2 = DBGFR3OSQueryNameAndVersion(pThis->pUVM, NULL, 0, szVersion, sizeof(szVersion));
704	if (RT_SUCCESS(rc2))
705	LogRel(("DBGF/SampleReport: Version : \"%s\"\n", szVersion));
706	}
707	else
708	LogRel(("DBGF/SampleReport: Couldn't detect guest operating system rc=%Rcr\n", rc));
709
710	/*
711	* We keep an additional reference to ensure that the sample report stays alive,
712	* it will be dropped when the sample process is stopped.
713	*/
714	DBGFR3SampleReportRetain(pThis);
715
716	rc = RTTimerCreateEx(&pThis->hTimer, pThis->cSampleIntervalUs * 1000,
717	RTTIMER_FLAGS_CPU_ANY \| RTTIMER_FLAGS_HIGH_RES,
718	dbgfR3SampleReportTakeSample, pThis);
719	if (RT_SUCCESS(rc))
720	rc = RTTimerStart(pThis->hTimer, 0 /u64First/);
721	if (RT_FAILURE(rc))
722	{
723	if (pThis->hTimer)
724	{
725	int rc2 = RTTimerDestroy(pThis->hTimer);
726	AssertRC(rc2); RT_NOREF(rc2);
727	pThis->hTimer = NULL;
728	}
729
730	bool fXchg = ASMAtomicCmpXchgU32((volatile uint32_t *)&pThis->enmState, DBGFSAMPLEREPORTSTATE_READY,
731	DBGFSAMPLEREPORTSTATE_RUNNING);
732	Assert(fXchg); RT_NOREF(fXchg);
733	DBGFR3SampleReportRelease(pThis);
734	}
735
736	return rc;
737	}
738
739
740	/**
741	* Stops collecting samples for the given sample report.
742	*
743	* @returns VBox status code.
744	* @param hSample Sample report handle.
745	*/
746	VMMR3DECL(int) DBGFR3SampleReportStop(DBGFSAMPLEREPORT hSample)
747	{
748	PDBGFSAMPLEREPORTINT pThis = hSample;
749
750	AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
751	AssertReturn(ASMAtomicCmpXchgU32((volatile uint32_t *)&pThis->enmState, DBGFSAMPLEREPORTSTATE_STOPPING,
752	DBGFSAMPLEREPORTSTATE_RUNNING),
753	VERR_INVALID_STATE);
754	return VINF_SUCCESS;
755	}
756
757
758	/**
759	* Dumps the current sample report to the given file.
760	*
761	* @returns VBox status code.
762	* @retval VERR_INVALID_STATE if nothing was sampled so far for reporting.
763	* @param hSample Sample report handle.
764	* @param pszFilename The filename to dump the report to.
765	*/
766	VMMR3DECL(int) DBGFR3SampleReportDumpToFile(DBGFSAMPLEREPORT hSample, const char *pszFilename)
767	{
768	PDBGFSAMPLEREPORTINT pThis = hSample;
769
770	AssertReturn(pThis->pszReport, VERR_INVALID_STATE);
771
772	PRTSTREAM hStream;
773	int rc = RTStrmOpen(pszFilename, "w", &hStream);
774	if (RT_SUCCESS(rc))
775	{
776	rc = RTStrmPutStr(hStream, pThis->pszReport);
777	RTStrmClose(hStream);
778	}
779
780	return rc;
781	}
782

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source: vbox/trunk/src/VBox/VMM/VMMR3/DBGFR3SampleReport.cpp

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