1// SPDX-License-Identifier: GPL-2.0-only 
   2
   3#include "util/cgroup.h"
   4#include "util/data.h"
   5#include "util/debug.h"
   6#include "util/dso.h"
   7#include "util/event.h"
   8#include "util/evlist.h"
   9#include "util/machine.h"
  10#include "util/map.h"
  11#include "util/map_symbol.h"
  12#include "util/branch.h"
  13#include "util/memswap.h"
  14#include "util/namespaces.h"
  15#include "util/session.h"
  16#include "util/stat.h"
  17#include "util/symbol.h"
  18#include "util/synthetic-events.h"
  19#include "util/target.h"
  20#include "util/time-utils.h"
 
  21#include <linux/bitops.h>
  22#include <linux/kernel.h>
  23#include <linux/string.h>
  24#include <linux/zalloc.h>
  25#include <linux/perf_event.h>
  26#include <asm/bug.h>
  27#include <perf/evsel.h>
  28#include <perf/cpumap.h>
  29#include <internal/lib.h> // page_size
  30#include <internal/threadmap.h>
  31#include <perf/threadmap.h>
  32#include <symbol/kallsyms.h>
  33#include <dirent.h>
  34#include <errno.h>
  35#include <inttypes.h>
  36#include <stdio.h>
  37#include <string.h>
  38#include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */
  39#include <api/fs/fs.h>
  40#include <api/io.h>
  41#include <sys/types.h>
  42#include <sys/stat.h>
  43#include <fcntl.h>
  44#include <unistd.h>
  45
  46#define DEFAULT_PROC_MAP_PARSE_TIMEOUT 500
  47
  48unsigned int proc_map_timeout = DEFAULT_PROC_MAP_PARSE_TIMEOUT;
  49
  50int perf_tool__process_synth_event(struct perf_tool *tool,
  51				   union perf_event *event,
  52				   struct machine *machine,
  53				   perf_event__handler_t process)
  54{
  55	struct perf_sample synth_sample = {
  56		.pid	   = -1,
  57		.tid	   = -1,
  58		.time	   = -1,
  59		.stream_id = -1,
  60		.cpu	   = -1,
  61		.period	   = 1,
  62		.cpumode   = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK,
  63	};
  64
  65	return process(tool, event, &synth_sample, machine);
  66};
  67
  68/*
  69 * Assumes that the first 4095 bytes of /proc/pid/stat contains
  70 * the comm, tgid and ppid.
  71 */
  72static int perf_event__get_comm_ids(pid_t pid, pid_t tid, char *comm, size_t len,
  73				    pid_t *tgid, pid_t *ppid, bool *kernel)
  74{
  75	char bf[4096];
  76	int fd;
  77	size_t size = 0;
  78	ssize_t n;
  79	char *name, *tgids, *ppids, *vmpeak, *threads;
  80
  81	*tgid = -1;
  82	*ppid = -1;
  83
  84	if (pid)
  85		snprintf(bf, sizeof(bf), "/proc/%d/task/%d/status", pid, tid);
  86	else
  87		snprintf(bf, sizeof(bf), "/proc/%d/status", tid);
  88
  89	fd = open(bf, O_RDONLY);
  90	if (fd < 0) {
  91		pr_debug("couldn't open %s\n", bf);
  92		return -1;
  93	}
  94
  95	n = read(fd, bf, sizeof(bf) - 1);
  96	close(fd);
  97	if (n <= 0) {
  98		pr_warning("Couldn't get COMM, tigd and ppid for pid %d\n",
  99			   tid);
 100		return -1;
 101	}
 102	bf[n] = '\0';
 103
 104	name = strstr(bf, "Name:");
 105	tgids = strstr(name ?: bf, "Tgid:");
 106	ppids = strstr(tgids ?: bf, "PPid:");
 107	vmpeak = strstr(ppids ?: bf, "VmPeak:");
 108
 109	if (vmpeak)
 110		threads = NULL;
 111	else
 112		threads = strstr(ppids ?: bf, "Threads:");
 113
 114	if (name) {
 115		char *nl;
 116
 117		name = skip_spaces(name + 5);  /* strlen("Name:") */
 118		nl = strchr(name, '\n');
 119		if (nl)
 120			*nl = '\0';
 121
 122		size = strlen(name);
 123		if (size >= len)
 124			size = len - 1;
 125		memcpy(comm, name, size);
 126		comm[size] = '\0';
 127	} else {
 128		pr_debug("Name: string not found for pid %d\n", tid);
 129	}
 130
 131	if (tgids) {
 132		tgids += 5;  /* strlen("Tgid:") */
 133		*tgid = atoi(tgids);
 134	} else {
 135		pr_debug("Tgid: string not found for pid %d\n", tid);
 136	}
 137
 138	if (ppids) {
 139		ppids += 5;  /* strlen("PPid:") */
 140		*ppid = atoi(ppids);
 141	} else {
 142		pr_debug("PPid: string not found for pid %d\n", tid);
 143	}
 144
 145	if (!vmpeak && threads)
 146		*kernel = true;
 147	else
 148		*kernel = false;
 149
 150	return 0;
 151}
 152
 153static int perf_event__prepare_comm(union perf_event *event, pid_t pid, pid_t tid,
 154				    struct machine *machine,
 155				    pid_t *tgid, pid_t *ppid, bool *kernel)
 156{
 157	size_t size;
 158
 159	*ppid = -1;
 160
 161	memset(&event->comm, 0, sizeof(event->comm));
 162
 163	if (machine__is_host(machine)) {
 164		if (perf_event__get_comm_ids(pid, tid, event->comm.comm,
 165					     sizeof(event->comm.comm),
 166					     tgid, ppid, kernel) != 0) {
 167			return -1;
 168		}
 169	} else {
 170		*tgid = machine->pid;
 171	}
 172
 173	if (*tgid < 0)
 174		return -1;
 175
 176	event->comm.pid = *tgid;
 177	event->comm.header.type = PERF_RECORD_COMM;
 178
 179	size = strlen(event->comm.comm) + 1;
 180	size = PERF_ALIGN(size, sizeof(u64));
 181	memset(event->comm.comm + size, 0, machine->id_hdr_size);
 182	event->comm.header.size = (sizeof(event->comm) -
 183				(sizeof(event->comm.comm) - size) +
 184				machine->id_hdr_size);
 185	event->comm.tid = tid;
 186
 187	return 0;
 188}
 189
 190pid_t perf_event__synthesize_comm(struct perf_tool *tool,
 191					 union perf_event *event, pid_t pid,
 192					 perf_event__handler_t process,
 193					 struct machine *machine)
 194{
 195	pid_t tgid, ppid;
 196	bool kernel_thread;
 197
 198	if (perf_event__prepare_comm(event, 0, pid, machine, &tgid, &ppid,
 199				     &kernel_thread) != 0)
 200		return -1;
 201
 202	if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
 203		return -1;
 204
 205	return tgid;
 206}
 207
 208static void perf_event__get_ns_link_info(pid_t pid, const char *ns,
 209					 struct perf_ns_link_info *ns_link_info)
 210{
 211	struct stat64 st;
 212	char proc_ns[128];
 213
 214	sprintf(proc_ns, "/proc/%u/ns/%s", pid, ns);
 215	if (stat64(proc_ns, &st) == 0) {
 216		ns_link_info->dev = st.st_dev;
 217		ns_link_info->ino = st.st_ino;
 218	}
 219}
 220
 221int perf_event__synthesize_namespaces(struct perf_tool *tool,
 222				      union perf_event *event,
 223				      pid_t pid, pid_t tgid,
 224				      perf_event__handler_t process,
 225				      struct machine *machine)
 226{
 227	u32 idx;
 228	struct perf_ns_link_info *ns_link_info;
 229
 230	if (!tool || !tool->namespace_events)
 231		return 0;
 232
 233	memset(&event->namespaces, 0, (sizeof(event->namespaces) +
 234	       (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 235	       machine->id_hdr_size));
 236
 237	event->namespaces.pid = tgid;
 238	event->namespaces.tid = pid;
 239
 240	event->namespaces.nr_namespaces = NR_NAMESPACES;
 241
 242	ns_link_info = event->namespaces.link_info;
 243
 244	for (idx = 0; idx < event->namespaces.nr_namespaces; idx++)
 245		perf_event__get_ns_link_info(pid, perf_ns__name(idx),
 246					     &ns_link_info[idx]);
 247
 248	event->namespaces.header.type = PERF_RECORD_NAMESPACES;
 249
 250	event->namespaces.header.size = (sizeof(event->namespaces) +
 251			(NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 252			machine->id_hdr_size);
 253
 254	if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
 255		return -1;
 256
 257	return 0;
 258}
 259
 260static int perf_event__synthesize_fork(struct perf_tool *tool,
 261				       union perf_event *event,
 262				       pid_t pid, pid_t tgid, pid_t ppid,
 263				       perf_event__handler_t process,
 264				       struct machine *machine)
 265{
 266	memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size);
 267
 268	/*
 269	 * for main thread set parent to ppid from status file. For other
 270	 * threads set parent pid to main thread. ie., assume main thread
 271	 * spawns all threads in a process
 272	*/
 273	if (tgid == pid) {
 274		event->fork.ppid = ppid;
 275		event->fork.ptid = ppid;
 276	} else {
 277		event->fork.ppid = tgid;
 278		event->fork.ptid = tgid;
 279	}
 280	event->fork.pid  = tgid;
 281	event->fork.tid  = pid;
 282	event->fork.header.type = PERF_RECORD_FORK;
 283	event->fork.header.misc = PERF_RECORD_MISC_FORK_EXEC;
 284
 285	event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size);
 286
 287	if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
 288		return -1;
 289
 290	return 0;
 291}
 292
 293static bool read_proc_maps_line(struct io *io, __u64 *start, __u64 *end,
 294				u32 *prot, u32 *flags, __u64 *offset,
 295				u32 *maj, u32 *min,
 296				__u64 *inode,
 297				ssize_t pathname_size, char *pathname)
 298{
 299	__u64 temp;
 300	int ch;
 301	char *start_pathname = pathname;
 302
 303	if (io__get_hex(io, start) != '-')
 304		return false;
 305	if (io__get_hex(io, end) != ' ')
 306		return false;
 307
 308	/* map protection and flags bits */
 309	*prot = 0;
 310	ch = io__get_char(io);
 311	if (ch == 'r')
 312		*prot |= PROT_READ;
 313	else if (ch != '-')
 314		return false;
 315	ch = io__get_char(io);
 316	if (ch == 'w')
 317		*prot |= PROT_WRITE;
 318	else if (ch != '-')
 319		return false;
 320	ch = io__get_char(io);
 321	if (ch == 'x')
 322		*prot |= PROT_EXEC;
 323	else if (ch != '-')
 324		return false;
 325	ch = io__get_char(io);
 326	if (ch == 's')
 327		*flags = MAP_SHARED;
 328	else if (ch == 'p')
 329		*flags = MAP_PRIVATE;
 330	else
 331		return false;
 332	if (io__get_char(io) != ' ')
 333		return false;
 334
 335	if (io__get_hex(io, offset) != ' ')
 336		return false;
 337
 338	if (io__get_hex(io, &temp) != ':')
 339		return false;
 340	*maj = temp;
 341	if (io__get_hex(io, &temp) != ' ')
 342		return false;
 343	*min = temp;
 344
 345	ch = io__get_dec(io, inode);
 346	if (ch != ' ') {
 347		*pathname = '\0';
 348		return ch == '\n';
 349	}
 350	do {
 351		ch = io__get_char(io);
 352	} while (ch == ' ');
 353	while (true) {
 354		if (ch < 0)
 355			return false;
 356		if (ch == '\0' || ch == '\n' ||
 357		    (pathname + 1 - start_pathname) >= pathname_size) {
 358			*pathname = '\0';
 359			return true;
 360		}
 361		*pathname++ = ch;
 362		ch = io__get_char(io);
 363	}
 364}
 365
 366static void perf_record_mmap2__read_build_id(struct perf_record_mmap2 *event,
 367					     struct machine *machine,
 368					     bool is_kernel)
 369{
 370	struct build_id bid;
 371	struct nsinfo *nsi;
 372	struct nscookie nc;
 373	struct dso *dso = NULL;
 374	struct dso_id id;
 375	int rc;
 376
 377	if (is_kernel) {
 378		rc = sysfs__read_build_id("/sys/kernel/notes", &bid);
 379		goto out;
 380	}
 381
 382	id.maj = event->maj;
 383	id.min = event->min;
 384	id.ino = event->ino;
 385	id.ino_generation = event->ino_generation;
 386
 387	dso = dsos__findnew_id(&machine->dsos, event->filename, &id);
 388	if (dso && dso->has_build_id) {
 389		bid = dso->bid;
 390		rc = 0;
 391		goto out;
 392	}
 393
 394	nsi = nsinfo__new(event->pid);
 395	nsinfo__mountns_enter(nsi, &nc);
 396
 397	rc = filename__read_build_id(event->filename, &bid) > 0 ? 0 : -1;
 398
 399	nsinfo__mountns_exit(&nc);
 400	nsinfo__put(nsi);
 401
 402out:
 403	if (rc == 0) {
 404		memcpy(event->build_id, bid.data, sizeof(bid.data));
 405		event->build_id_size = (u8) bid.size;
 406		event->header.misc |= PERF_RECORD_MISC_MMAP_BUILD_ID;
 407		event->__reserved_1 = 0;
 408		event->__reserved_2 = 0;
 409
 410		if (dso && !dso->has_build_id)
 411			dso__set_build_id(dso, &bid);
 412	} else {
 413		if (event->filename[0] == '/') {
 414			pr_debug2("Failed to read build ID for %s\n",
 415				  event->filename);
 416		}
 417	}
 418	dso__put(dso);
 419}
 420
 421int perf_event__synthesize_mmap_events(struct perf_tool *tool,
 422				       union perf_event *event,
 423				       pid_t pid, pid_t tgid,
 424				       perf_event__handler_t process,
 425				       struct machine *machine,
 426				       bool mmap_data)
 427{
 428	unsigned long long t;
 429	char bf[BUFSIZ];
 430	struct io io;
 431	bool truncation = false;
 432	unsigned long long timeout = proc_map_timeout * 1000000ULL;
 433	int rc = 0;
 434	const char *hugetlbfs_mnt = hugetlbfs__mountpoint();
 435	int hugetlbfs_mnt_len = hugetlbfs_mnt ? strlen(hugetlbfs_mnt) : 0;
 436
 437	if (machine__is_default_guest(machine))
 438		return 0;
 439
 440	snprintf(bf, sizeof(bf), "%s/proc/%d/task/%d/maps",
 441		machine->root_dir, pid, pid);
 442
 443	io.fd = open(bf, O_RDONLY, 0);
 444	if (io.fd < 0) {
 445		/*
 446		 * We raced with a task exiting - just return:
 447		 */
 448		pr_debug("couldn't open %s\n", bf);
 449		return -1;
 450	}
 451	io__init(&io, io.fd, bf, sizeof(bf));
 452
 453	event->header.type = PERF_RECORD_MMAP2;
 454	t = rdclock();
 455
 456	while (!io.eof) {
 457		static const char anonstr[] = "//anon";
 458		size_t size, aligned_size;
 459
 460		/* ensure null termination since stack will be reused. */
 461		event->mmap2.filename[0] = '\0';
 462
 463		/* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
 464		if (!read_proc_maps_line(&io,
 465					&event->mmap2.start,
 466					&event->mmap2.len,
 467					&event->mmap2.prot,
 468					&event->mmap2.flags,
 469					&event->mmap2.pgoff,
 470					&event->mmap2.maj,
 471					&event->mmap2.min,
 472					&event->mmap2.ino,
 473					sizeof(event->mmap2.filename),
 474					event->mmap2.filename))
 475			continue;
 476
 477		if ((rdclock() - t) > timeout) {
 478			pr_warning("Reading %s/proc/%d/task/%d/maps time out. "
 479				   "You may want to increase "
 480				   "the time limit by --proc-map-timeout\n",
 481				   machine->root_dir, pid, pid);
 482			truncation = true;
 483			goto out;
 484		}
 485
 486		event->mmap2.ino_generation = 0;
 487
 488		/*
 489		 * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
 490		 */
 491		if (machine__is_host(machine))
 492			event->header.misc = PERF_RECORD_MISC_USER;
 493		else
 494			event->header.misc = PERF_RECORD_MISC_GUEST_USER;
 495
 496		if ((event->mmap2.prot & PROT_EXEC) == 0) {
 497			if (!mmap_data || (event->mmap2.prot & PROT_READ) == 0)
 498				continue;
 499
 500			event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
 501		}
 502
 503out:
 504		if (truncation)
 505			event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT;
 506
 507		if (!strcmp(event->mmap2.filename, ""))
 508			strcpy(event->mmap2.filename, anonstr);
 509
 510		if (hugetlbfs_mnt_len &&
 511		    !strncmp(event->mmap2.filename, hugetlbfs_mnt,
 512			     hugetlbfs_mnt_len)) {
 513			strcpy(event->mmap2.filename, anonstr);
 514			event->mmap2.flags |= MAP_HUGETLB;
 515		}
 516
 517		size = strlen(event->mmap2.filename) + 1;
 518		aligned_size = PERF_ALIGN(size, sizeof(u64));
 519		event->mmap2.len -= event->mmap.start;
 520		event->mmap2.header.size = (sizeof(event->mmap2) -
 521					(sizeof(event->mmap2.filename) - aligned_size));
 522		memset(event->mmap2.filename + size, 0, machine->id_hdr_size +
 523			(aligned_size - size));
 524		event->mmap2.header.size += machine->id_hdr_size;
 525		event->mmap2.pid = tgid;
 526		event->mmap2.tid = pid;
 527
 528		if (symbol_conf.buildid_mmap2)
 529			perf_record_mmap2__read_build_id(&event->mmap2, machine, false);
 530
 531		if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
 532			rc = -1;
 533			break;
 534		}
 535
 536		if (truncation)
 537			break;
 538	}
 539
 540	close(io.fd);
 541	return rc;
 542}
 543
 544#ifdef HAVE_FILE_HANDLE
 545static int perf_event__synthesize_cgroup(struct perf_tool *tool,
 546					 union perf_event *event,
 547					 char *path, size_t mount_len,
 548					 perf_event__handler_t process,
 549					 struct machine *machine)
 550{
 551	size_t event_size = sizeof(event->cgroup) - sizeof(event->cgroup.path);
 552	size_t path_len = strlen(path) - mount_len + 1;
 553	struct {
 554		struct file_handle fh;
 555		uint64_t cgroup_id;
 556	} handle;
 557	int mount_id;
 558
 559	while (path_len % sizeof(u64))
 560		path[mount_len + path_len++] = '\0';
 561
 562	memset(&event->cgroup, 0, event_size);
 563
 564	event->cgroup.header.type = PERF_RECORD_CGROUP;
 565	event->cgroup.header.size = event_size + path_len + machine->id_hdr_size;
 566
 567	handle.fh.handle_bytes = sizeof(handle.cgroup_id);
 568	if (name_to_handle_at(AT_FDCWD, path, &handle.fh, &mount_id, 0) < 0) {
 569		pr_debug("stat failed: %s\n", path);
 570		return -1;
 571	}
 572
 573	event->cgroup.id = handle.cgroup_id;
 574	strncpy(event->cgroup.path, path + mount_len, path_len);
 575	memset(event->cgroup.path + path_len, 0, machine->id_hdr_size);
 576
 577	if (perf_tool__process_synth_event(tool, event, machine, process) < 0) {
 578		pr_debug("process synth event failed\n");
 579		return -1;
 580	}
 581
 582	return 0;
 583}
 584
 585static int perf_event__walk_cgroup_tree(struct perf_tool *tool,
 586					union perf_event *event,
 587					char *path, size_t mount_len,
 588					perf_event__handler_t process,
 589					struct machine *machine)
 590{
 591	size_t pos = strlen(path);
 592	DIR *d;
 593	struct dirent *dent;
 594	int ret = 0;
 595
 596	if (perf_event__synthesize_cgroup(tool, event, path, mount_len,
 597					  process, machine) < 0)
 598		return -1;
 599
 600	d = opendir(path);
 601	if (d == NULL) {
 602		pr_debug("failed to open directory: %s\n", path);
 603		return -1;
 604	}
 605
 606	while ((dent = readdir(d)) != NULL) {
 607		if (dent->d_type != DT_DIR)
 608			continue;
 609		if (!strcmp(dent->d_name, ".") ||
 610		    !strcmp(dent->d_name, ".."))
 611			continue;
 612
 613		/* any sane path should be less than PATH_MAX */
 614		if (strlen(path) + strlen(dent->d_name) + 1 >= PATH_MAX)
 615			continue;
 616
 617		if (path[pos - 1] != '/')
 618			strcat(path, "/");
 619		strcat(path, dent->d_name);
 620
 621		ret = perf_event__walk_cgroup_tree(tool, event, path,
 622						   mount_len, process, machine);
 623		if (ret < 0)
 624			break;
 625
 626		path[pos] = '\0';
 627	}
 628
 629	closedir(d);
 630	return ret;
 631}
 632
 633int perf_event__synthesize_cgroups(struct perf_tool *tool,
 634				   perf_event__handler_t process,
 635				   struct machine *machine)
 636{
 637	union perf_event event;
 638	char cgrp_root[PATH_MAX];
 639	size_t mount_len;  /* length of mount point in the path */
 640
 641	if (!tool || !tool->cgroup_events)
 642		return 0;
 643
 644	if (cgroupfs_find_mountpoint(cgrp_root, PATH_MAX, "perf_event") < 0) {
 645		pr_debug("cannot find cgroup mount point\n");
 646		return -1;
 647	}
 648
 649	mount_len = strlen(cgrp_root);
 650	/* make sure the path starts with a slash (after mount point) */
 651	strcat(cgrp_root, "/");
 652
 653	if (perf_event__walk_cgroup_tree(tool, &event, cgrp_root, mount_len,
 654					 process, machine) < 0)
 655		return -1;
 656
 657	return 0;
 658}
 659#else
 660int perf_event__synthesize_cgroups(struct perf_tool *tool __maybe_unused,
 661				   perf_event__handler_t process __maybe_unused,
 662				   struct machine *machine __maybe_unused)
 663{
 664	return -1;
 665}
 666#endif
 667
 668struct perf_event__synthesize_modules_maps_cb_args {
 669	struct perf_tool *tool;
 670	perf_event__handler_t process;
 671	struct machine *machine;
 672	union perf_event *event;
 673};
 674
 675static int perf_event__synthesize_modules_maps_cb(struct map *map, void *data)
 676{
 677	struct perf_event__synthesize_modules_maps_cb_args *args = data;
 678	union perf_event *event = args->event;
 679	struct dso *dso;
 680	size_t size;
 681
 682	if (!__map__is_kmodule(map))
 683		return 0;
 684
 685	dso = map__dso(map);
 686	if (symbol_conf.buildid_mmap2) {
 687		size = PERF_ALIGN(dso->long_name_len + 1, sizeof(u64));
 688		event->mmap2.header.type = PERF_RECORD_MMAP2;
 689		event->mmap2.header.size = (sizeof(event->mmap2) -
 690					(sizeof(event->mmap2.filename) - size));
 691		memset(event->mmap2.filename + size, 0, args->machine->id_hdr_size);
 692		event->mmap2.header.size += args->machine->id_hdr_size;
 693		event->mmap2.start = map__start(map);
 694		event->mmap2.len   = map__size(map);
 695		event->mmap2.pid   = args->machine->pid;
 696
 697		memcpy(event->mmap2.filename, dso->long_name, dso->long_name_len + 1);
 698
 699		perf_record_mmap2__read_build_id(&event->mmap2, args->machine, false);
 700	} else {
 701		size = PERF_ALIGN(dso->long_name_len + 1, sizeof(u64));
 702		event->mmap.header.type = PERF_RECORD_MMAP;
 703		event->mmap.header.size = (sizeof(event->mmap) -
 704					(sizeof(event->mmap.filename) - size));
 705		memset(event->mmap.filename + size, 0, args->machine->id_hdr_size);
 706		event->mmap.header.size += args->machine->id_hdr_size;
 707		event->mmap.start = map__start(map);
 708		event->mmap.len   = map__size(map);
 709		event->mmap.pid   = args->machine->pid;
 710
 711		memcpy(event->mmap.filename, dso->long_name, dso->long_name_len + 1);
 712	}
 713
 714	if (perf_tool__process_synth_event(args->tool, event, args->machine, args->process) != 0)
 715		return -1;
 716
 717	return 0;
 718}
 719
 720int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t process,
 721				   struct machine *machine)
 722{
 723	int rc;
 
 724	struct maps *maps = machine__kernel_maps(machine);
 725	struct perf_event__synthesize_modules_maps_cb_args args = {
 726		.tool = tool,
 727		.process = process,
 728		.machine = machine,
 729	};
 730	size_t size = symbol_conf.buildid_mmap2
 731		? sizeof(args.event->mmap2)
 732		: sizeof(args.event->mmap);
 733
 734	args.event = zalloc(size + machine->id_hdr_size);
 735	if (args.event == NULL) {
 736		pr_debug("Not enough memory synthesizing mmap event "
 737			 "for kernel modules\n");
 738		return -1;
 739	}
 740
 741	/*
 742	 * kernel uses 0 for user space maps, see kernel/perf_event.c
 743	 * __perf_event_mmap
 744	 */
 745	if (machine__is_host(machine))
 746		args.event->header.misc = PERF_RECORD_MISC_KERNEL;
 747	else
 748		args.event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 749
 750	rc = maps__for_each_map(maps, perf_event__synthesize_modules_maps_cb, &args);
 
 
 
 
 751
 752	free(args.event);
 753	return rc;
 754}
 755
 756static int filter_task(const struct dirent *dirent)
 757{
 758	return isdigit(dirent->d_name[0]);
 759}
 760
 761static int __event__synthesize_thread(union perf_event *comm_event,
 762				      union perf_event *mmap_event,
 763				      union perf_event *fork_event,
 764				      union perf_event *namespaces_event,
 765				      pid_t pid, int full, perf_event__handler_t process,
 766				      struct perf_tool *tool, struct machine *machine,
 767				      bool needs_mmap, bool mmap_data)
 768{
 769	char filename[PATH_MAX];
 770	struct dirent **dirent;
 771	pid_t tgid, ppid;
 772	int rc = 0;
 773	int i, n;
 774
 775	/* special case: only send one comm event using passed in pid */
 776	if (!full) {
 777		tgid = perf_event__synthesize_comm(tool, comm_event, pid,
 778						   process, machine);
 779
 780		if (tgid == -1)
 781			return -1;
 782
 783		if (perf_event__synthesize_namespaces(tool, namespaces_event, pid,
 784						      tgid, process, machine) < 0)
 785			return -1;
 786
 787		/*
 788		 * send mmap only for thread group leader
 789		 * see thread__init_maps()
 790		 */
 791		if (pid == tgid && needs_mmap &&
 792		    perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 793						       process, machine, mmap_data))
 794			return -1;
 795
 796		return 0;
 797	}
 798
 799	if (machine__is_default_guest(machine))
 800		return 0;
 801
 802	snprintf(filename, sizeof(filename), "%s/proc/%d/task",
 803		 machine->root_dir, pid);
 804
 805	n = scandir(filename, &dirent, filter_task, NULL);
 806	if (n < 0)
 807		return n;
 808
 809	for (i = 0; i < n; i++) {
 810		char *end;
 811		pid_t _pid;
 812		bool kernel_thread = false;
 813
 814		_pid = strtol(dirent[i]->d_name, &end, 10);
 815		if (*end)
 816			continue;
 817
 818		/* some threads may exit just after scan, ignore it */
 819		if (perf_event__prepare_comm(comm_event, pid, _pid, machine,
 820					     &tgid, &ppid, &kernel_thread) != 0)
 821			continue;
 822
 823		rc = -1;
 824		if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
 825						ppid, process, machine) < 0)
 826			break;
 827
 828		if (perf_event__synthesize_namespaces(tool, namespaces_event, _pid,
 829						      tgid, process, machine) < 0)
 830			break;
 831
 832		/*
 833		 * Send the prepared comm event
 834		 */
 835		if (perf_tool__process_synth_event(tool, comm_event, machine, process) != 0)
 836			break;
 837
 838		rc = 0;
 839		if (_pid == pid && !kernel_thread && needs_mmap) {
 840			/* process the parent's maps too */
 841			rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 842						process, machine, mmap_data);
 843			if (rc)
 844				break;
 845		}
 846	}
 847
 848	for (i = 0; i < n; i++)
 849		zfree(&dirent[i]);
 850	free(dirent);
 851
 852	return rc;
 853}
 854
 855int perf_event__synthesize_thread_map(struct perf_tool *tool,
 856				      struct perf_thread_map *threads,
 857				      perf_event__handler_t process,
 858				      struct machine *machine,
 859				      bool needs_mmap, bool mmap_data)
 860{
 861	union perf_event *comm_event, *mmap_event, *fork_event;
 862	union perf_event *namespaces_event;
 863	int err = -1, thread, j;
 864
 865	comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 866	if (comm_event == NULL)
 867		goto out;
 868
 869	mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
 870	if (mmap_event == NULL)
 871		goto out_free_comm;
 872
 873	fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
 874	if (fork_event == NULL)
 875		goto out_free_mmap;
 876
 877	namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
 878				  (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 879				  machine->id_hdr_size);
 880	if (namespaces_event == NULL)
 881		goto out_free_fork;
 882
 883	err = 0;
 884	for (thread = 0; thread < threads->nr; ++thread) {
 885		if (__event__synthesize_thread(comm_event, mmap_event,
 886					       fork_event, namespaces_event,
 887					       perf_thread_map__pid(threads, thread), 0,
 888					       process, tool, machine,
 889					       needs_mmap, mmap_data)) {
 890			err = -1;
 891			break;
 892		}
 893
 894		/*
 895		 * comm.pid is set to thread group id by
 896		 * perf_event__synthesize_comm
 897		 */
 898		if ((int) comm_event->comm.pid != perf_thread_map__pid(threads, thread)) {
 899			bool need_leader = true;
 900
 901			/* is thread group leader in thread_map? */
 902			for (j = 0; j < threads->nr; ++j) {
 903				if ((int) comm_event->comm.pid == perf_thread_map__pid(threads, j)) {
 904					need_leader = false;
 905					break;
 906				}
 907			}
 908
 909			/* if not, generate events for it */
 910			if (need_leader &&
 911			    __event__synthesize_thread(comm_event, mmap_event,
 912						       fork_event, namespaces_event,
 913						       comm_event->comm.pid, 0,
 914						       process, tool, machine,
 915						       needs_mmap, mmap_data)) {
 916				err = -1;
 917				break;
 918			}
 919		}
 920	}
 921	free(namespaces_event);
 922out_free_fork:
 923	free(fork_event);
 924out_free_mmap:
 925	free(mmap_event);
 926out_free_comm:
 927	free(comm_event);
 928out:
 929	return err;
 930}
 931
 932static int __perf_event__synthesize_threads(struct perf_tool *tool,
 933					    perf_event__handler_t process,
 934					    struct machine *machine,
 935					    bool needs_mmap,
 936					    bool mmap_data,
 937					    struct dirent **dirent,
 938					    int start,
 939					    int num)
 940{
 941	union perf_event *comm_event, *mmap_event, *fork_event;
 942	union perf_event *namespaces_event;
 943	int err = -1;
 944	char *end;
 945	pid_t pid;
 946	int i;
 947
 948	comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 949	if (comm_event == NULL)
 950		goto out;
 951
 952	mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
 953	if (mmap_event == NULL)
 954		goto out_free_comm;
 955
 956	fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
 957	if (fork_event == NULL)
 958		goto out_free_mmap;
 959
 960	namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
 961				  (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 962				  machine->id_hdr_size);
 963	if (namespaces_event == NULL)
 964		goto out_free_fork;
 965
 966	for (i = start; i < start + num; i++) {
 967		if (!isdigit(dirent[i]->d_name[0]))
 968			continue;
 969
 970		pid = (pid_t)strtol(dirent[i]->d_name, &end, 10);
 971		/* only interested in proper numerical dirents */
 972		if (*end)
 973			continue;
 974		/*
 975		 * We may race with exiting thread, so don't stop just because
 976		 * one thread couldn't be synthesized.
 977		 */
 978		__event__synthesize_thread(comm_event, mmap_event, fork_event,
 979					   namespaces_event, pid, 1, process,
 980					   tool, machine, needs_mmap, mmap_data);
 981	}
 982	err = 0;
 983
 984	free(namespaces_event);
 985out_free_fork:
 986	free(fork_event);
 987out_free_mmap:
 988	free(mmap_event);
 989out_free_comm:
 990	free(comm_event);
 991out:
 992	return err;
 993}
 994
 995struct synthesize_threads_arg {
 996	struct perf_tool *tool;
 997	perf_event__handler_t process;
 998	struct machine *machine;
 999	bool needs_mmap;
1000	bool mmap_data;
1001	struct dirent **dirent;
1002	int num;
1003	int start;
1004};
1005
1006static void *synthesize_threads_worker(void *arg)
1007{
1008	struct synthesize_threads_arg *args = arg;
1009
1010	__perf_event__synthesize_threads(args->tool, args->process,
1011					 args->machine,
1012					 args->needs_mmap, args->mmap_data,
1013					 args->dirent,
1014					 args->start, args->num);
1015	return NULL;
1016}
1017
1018int perf_event__synthesize_threads(struct perf_tool *tool,
1019				   perf_event__handler_t process,
1020				   struct machine *machine,
1021				   bool needs_mmap, bool mmap_data,
1022				   unsigned int nr_threads_synthesize)
1023{
1024	struct synthesize_threads_arg *args = NULL;
1025	pthread_t *synthesize_threads = NULL;
1026	char proc_path[PATH_MAX];
1027	struct dirent **dirent;
1028	int num_per_thread;
1029	int m, n, i, j;
1030	int thread_nr;
1031	int base = 0;
1032	int err = -1;
1033
1034
1035	if (machine__is_default_guest(machine))
1036		return 0;
1037
1038	snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
1039	n = scandir(proc_path, &dirent, filter_task, NULL);
1040	if (n < 0)
1041		return err;
1042
1043	if (nr_threads_synthesize == UINT_MAX)
1044		thread_nr = sysconf(_SC_NPROCESSORS_ONLN);
1045	else
1046		thread_nr = nr_threads_synthesize;
1047
1048	if (thread_nr <= 1) {
1049		err = __perf_event__synthesize_threads(tool, process,
1050						       machine,
1051						       needs_mmap, mmap_data,
1052						       dirent, base, n);
1053		goto free_dirent;
1054	}
1055	if (thread_nr > n)
1056		thread_nr = n;
1057
1058	synthesize_threads = calloc(thread_nr, sizeof(pthread_t));
1059	if (synthesize_threads == NULL)
1060		goto free_dirent;
1061
1062	args = calloc(thread_nr, sizeof(*args));
1063	if (args == NULL)
1064		goto free_threads;
1065
1066	num_per_thread = n / thread_nr;
1067	m = n % thread_nr;
1068	for (i = 0; i < thread_nr; i++) {
1069		args[i].tool = tool;
1070		args[i].process = process;
1071		args[i].machine = machine;
1072		args[i].needs_mmap = needs_mmap;
1073		args[i].mmap_data = mmap_data;
1074		args[i].dirent = dirent;
1075	}
1076	for (i = 0; i < m; i++) {
1077		args[i].num = num_per_thread + 1;
1078		args[i].start = i * args[i].num;
1079	}
1080	if (i != 0)
1081		base = args[i-1].start + args[i-1].num;
1082	for (j = i; j < thread_nr; j++) {
1083		args[j].num = num_per_thread;
1084		args[j].start = base + (j - i) * args[i].num;
1085	}
1086
1087	for (i = 0; i < thread_nr; i++) {
1088		if (pthread_create(&synthesize_threads[i], NULL,
1089				   synthesize_threads_worker, &args[i]))
1090			goto out_join;
1091	}
1092	err = 0;
1093out_join:
1094	for (i = 0; i < thread_nr; i++)
1095		pthread_join(synthesize_threads[i], NULL);
1096	free(args);
1097free_threads:
1098	free(synthesize_threads);
1099free_dirent:
1100	for (i = 0; i < n; i++)
1101		zfree(&dirent[i]);
1102	free(dirent);
1103
1104	return err;
1105}
1106
1107int __weak perf_event__synthesize_extra_kmaps(struct perf_tool *tool __maybe_unused,
1108					      perf_event__handler_t process __maybe_unused,
1109					      struct machine *machine __maybe_unused)
1110{
1111	return 0;
1112}
1113
1114static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
1115						perf_event__handler_t process,
1116						struct machine *machine)
1117{
1118	union perf_event *event;
1119	size_t size = symbol_conf.buildid_mmap2 ?
1120			sizeof(event->mmap2) : sizeof(event->mmap);
1121	struct map *map = machine__kernel_map(machine);
1122	struct kmap *kmap;
1123	int err;
1124
1125	if (map == NULL)
1126		return -1;
1127
1128	kmap = map__kmap(map);
1129	if (!kmap->ref_reloc_sym)
1130		return -1;
1131
1132	/*
1133	 * We should get this from /sys/kernel/sections/.text, but till that is
1134	 * available use this, and after it is use this as a fallback for older
1135	 * kernels.
1136	 */
1137	event = zalloc(size + machine->id_hdr_size);
1138	if (event == NULL) {
1139		pr_debug("Not enough memory synthesizing mmap event "
1140			 "for kernel modules\n");
1141		return -1;
1142	}
1143
1144	if (machine__is_host(machine)) {
1145		/*
1146		 * kernel uses PERF_RECORD_MISC_USER for user space maps,
1147		 * see kernel/perf_event.c __perf_event_mmap
1148		 */
1149		event->header.misc = PERF_RECORD_MISC_KERNEL;
1150	} else {
1151		event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
1152	}
1153
1154	if (symbol_conf.buildid_mmap2) {
1155		size = snprintf(event->mmap2.filename, sizeof(event->mmap2.filename),
1156				"%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
1157		size = PERF_ALIGN(size, sizeof(u64));
1158		event->mmap2.header.type = PERF_RECORD_MMAP2;
1159		event->mmap2.header.size = (sizeof(event->mmap2) -
1160				(sizeof(event->mmap2.filename) - size) + machine->id_hdr_size);
1161		event->mmap2.pgoff = kmap->ref_reloc_sym->addr;
1162		event->mmap2.start = map__start(map);
1163		event->mmap2.len   = map__end(map) - event->mmap.start;
1164		event->mmap2.pid   = machine->pid;
1165
1166		perf_record_mmap2__read_build_id(&event->mmap2, machine, true);
1167	} else {
1168		size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
1169				"%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
1170		size = PERF_ALIGN(size, sizeof(u64));
1171		event->mmap.header.type = PERF_RECORD_MMAP;
1172		event->mmap.header.size = (sizeof(event->mmap) -
1173				(sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
1174		event->mmap.pgoff = kmap->ref_reloc_sym->addr;
1175		event->mmap.start = map__start(map);
1176		event->mmap.len   = map__end(map) - event->mmap.start;
1177		event->mmap.pid   = machine->pid;
1178	}
1179
1180	err = perf_tool__process_synth_event(tool, event, machine, process);
1181	free(event);
1182
1183	return err;
1184}
1185
1186int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
1187				       perf_event__handler_t process,
1188				       struct machine *machine)
1189{
1190	int err;
1191
1192	err = __perf_event__synthesize_kernel_mmap(tool, process, machine);
1193	if (err < 0)
1194		return err;
1195
1196	return perf_event__synthesize_extra_kmaps(tool, process, machine);
1197}
1198
1199int perf_event__synthesize_thread_map2(struct perf_tool *tool,
1200				      struct perf_thread_map *threads,
1201				      perf_event__handler_t process,
1202				      struct machine *machine)
1203{
1204	union perf_event *event;
1205	int i, err, size;
1206
1207	size  = sizeof(event->thread_map);
1208	size +=	threads->nr * sizeof(event->thread_map.entries[0]);
1209
1210	event = zalloc(size);
1211	if (!event)
1212		return -ENOMEM;
1213
1214	event->header.type = PERF_RECORD_THREAD_MAP;
1215	event->header.size = size;
1216	event->thread_map.nr = threads->nr;
1217
1218	for (i = 0; i < threads->nr; i++) {
1219		struct perf_record_thread_map_entry *entry = &event->thread_map.entries[i];
1220		char *comm = perf_thread_map__comm(threads, i);
1221
1222		if (!comm)
1223			comm = (char *) "";
1224
1225		entry->pid = perf_thread_map__pid(threads, i);
1226		strncpy((char *) &entry->comm, comm, sizeof(entry->comm));
1227	}
1228
1229	err = process(tool, event, NULL, machine);
1230
1231	free(event);
1232	return err;
1233}
1234
1235struct synthesize_cpu_map_data {
1236	const struct perf_cpu_map *map;
1237	int nr;
1238	int min_cpu;
1239	int max_cpu;
1240	int has_any_cpu;
1241	int type;
1242	size_t size;
1243	struct perf_record_cpu_map_data *data;
1244};
1245
1246static void synthesize_cpus(struct synthesize_cpu_map_data *data)
1247{
1248	data->data->type = PERF_CPU_MAP__CPUS;
1249	data->data->cpus_data.nr = data->nr;
1250	for (int i = 0; i < data->nr; i++)
1251		data->data->cpus_data.cpu[i] = perf_cpu_map__cpu(data->map, i).cpu;
 
 
1252}
1253
1254static void synthesize_mask(struct synthesize_cpu_map_data *data)
 
1255{
1256	int idx;
1257	struct perf_cpu cpu;
1258
1259	/* Due to padding, the 4bytes per entry mask variant is always smaller. */
1260	data->data->type = PERF_CPU_MAP__MASK;
1261	data->data->mask32_data.nr = BITS_TO_U32(data->max_cpu);
1262	data->data->mask32_data.long_size = 4;
1263
1264	perf_cpu_map__for_each_cpu(cpu, idx, data->map) {
1265		int bit_word = cpu.cpu / 32;
1266		u32 bit_mask = 1U << (cpu.cpu & 31);
1267
1268		data->data->mask32_data.mask[bit_word] |= bit_mask;
1269	}
 
1270}
1271
1272static void synthesize_range_cpus(struct synthesize_cpu_map_data *data)
1273{
1274	data->data->type = PERF_CPU_MAP__RANGE_CPUS;
1275	data->data->range_cpu_data.any_cpu = data->has_any_cpu;
1276	data->data->range_cpu_data.start_cpu = data->min_cpu;
1277	data->data->range_cpu_data.end_cpu = data->max_cpu;
 
 
 
 
 
 
 
 
 
1278}
1279
1280static void *cpu_map_data__alloc(struct synthesize_cpu_map_data *syn_data,
1281				 size_t header_size)
1282{
1283	size_t size_cpus, size_mask;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1284
1285	syn_data->nr = perf_cpu_map__nr(syn_data->map);
1286	syn_data->has_any_cpu = (perf_cpu_map__cpu(syn_data->map, 0).cpu == -1) ? 1 : 0;
 
 
 
 
 
1287
1288	syn_data->min_cpu = perf_cpu_map__cpu(syn_data->map, syn_data->has_any_cpu).cpu;
1289	syn_data->max_cpu = perf_cpu_map__max(syn_data->map).cpu;
1290	if (syn_data->max_cpu - syn_data->min_cpu + 1 == syn_data->nr - syn_data->has_any_cpu) {
1291		/* A consecutive range of CPUs can be encoded using a range. */
1292		assert(sizeof(u16) + sizeof(struct perf_record_range_cpu_map) == sizeof(u64));
1293		syn_data->type = PERF_CPU_MAP__RANGE_CPUS;
1294		syn_data->size = header_size + sizeof(u64);
1295		return zalloc(syn_data->size);
1296	}
1297
1298	size_cpus = sizeof(u16) + sizeof(struct cpu_map_entries) + syn_data->nr * sizeof(u16);
1299	/* Due to padding, the 4bytes per entry mask variant is always smaller. */
1300	size_mask = sizeof(u16) + sizeof(struct perf_record_mask_cpu_map32) +
1301		BITS_TO_U32(syn_data->max_cpu) * sizeof(__u32);
1302	if (syn_data->has_any_cpu || size_cpus < size_mask) {
1303		/* Follow the CPU map encoding. */
1304		syn_data->type = PERF_CPU_MAP__CPUS;
1305		syn_data->size = header_size + PERF_ALIGN(size_cpus, sizeof(u64));
1306		return zalloc(syn_data->size);
1307	}
1308	/* Encode using a bitmask. */
1309	syn_data->type = PERF_CPU_MAP__MASK;
1310	syn_data->size = header_size + PERF_ALIGN(size_mask, sizeof(u64));
1311	return zalloc(syn_data->size);
1312}
1313
1314static void cpu_map_data__synthesize(struct synthesize_cpu_map_data *data)
 
1315{
1316	switch (data->type) {
 
 
1317	case PERF_CPU_MAP__CPUS:
1318		synthesize_cpus(data);
1319		break;
1320	case PERF_CPU_MAP__MASK:
1321		synthesize_mask(data);
1322		break;
1323	case PERF_CPU_MAP__RANGE_CPUS:
1324		synthesize_range_cpus(data);
1325		break;
1326	default:
1327		break;
1328	}
1329}
1330
1331static struct perf_record_cpu_map *cpu_map_event__new(const struct perf_cpu_map *map)
1332{
1333	struct synthesize_cpu_map_data syn_data = { .map = map };
1334	struct perf_record_cpu_map *event;
 
 
1335
1336
1337	event = cpu_map_data__alloc(&syn_data, sizeof(struct perf_event_header));
1338	if (!event)
1339		return NULL;
1340
1341	syn_data.data = &event->data;
1342	event->header.type = PERF_RECORD_CPU_MAP;
1343	event->header.size = syn_data.size;
1344	cpu_map_data__synthesize(&syn_data);
 
 
1345	return event;
1346}
1347
1348
1349int perf_event__synthesize_cpu_map(struct perf_tool *tool,
1350				   const struct perf_cpu_map *map,
1351				   perf_event__handler_t process,
1352				   struct machine *machine)
1353{
1354	struct perf_record_cpu_map *event;
1355	int err;
1356
1357	event = cpu_map_event__new(map);
1358	if (!event)
1359		return -ENOMEM;
1360
1361	err = process(tool, (union perf_event *) event, NULL, machine);
1362
1363	free(event);
1364	return err;
1365}
1366
1367int perf_event__synthesize_stat_config(struct perf_tool *tool,
1368				       struct perf_stat_config *config,
1369				       perf_event__handler_t process,
1370				       struct machine *machine)
1371{
1372	struct perf_record_stat_config *event;
1373	int size, i = 0, err;
1374
1375	size  = sizeof(*event);
1376	size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0]));
1377
1378	event = zalloc(size);
1379	if (!event)
1380		return -ENOMEM;
1381
1382	event->header.type = PERF_RECORD_STAT_CONFIG;
1383	event->header.size = size;
1384	event->nr          = PERF_STAT_CONFIG_TERM__MAX;
1385
1386#define ADD(__term, __val)					\
1387	event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term;	\
1388	event->data[i].val = __val;				\
1389	i++;
1390
1391	ADD(AGGR_MODE,	config->aggr_mode)
1392	ADD(INTERVAL,	config->interval)
1393	ADD(SCALE,	config->scale)
1394	ADD(AGGR_LEVEL,	config->aggr_level)
1395
1396	WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX,
1397		  "stat config terms unbalanced\n");
1398#undef ADD
1399
1400	err = process(tool, (union perf_event *) event, NULL, machine);
1401
1402	free(event);
1403	return err;
1404}
1405
1406int perf_event__synthesize_stat(struct perf_tool *tool,
1407				struct perf_cpu cpu, u32 thread, u64 id,
1408				struct perf_counts_values *count,
1409				perf_event__handler_t process,
1410				struct machine *machine)
1411{
1412	struct perf_record_stat event;
1413
1414	event.header.type = PERF_RECORD_STAT;
1415	event.header.size = sizeof(event);
1416	event.header.misc = 0;
1417
1418	event.id        = id;
1419	event.cpu       = cpu.cpu;
1420	event.thread    = thread;
1421	event.val       = count->val;
1422	event.ena       = count->ena;
1423	event.run       = count->run;
1424
1425	return process(tool, (union perf_event *) &event, NULL, machine);
1426}
1427
1428int perf_event__synthesize_stat_round(struct perf_tool *tool,
1429				      u64 evtime, u64 type,
1430				      perf_event__handler_t process,
1431				      struct machine *machine)
1432{
1433	struct perf_record_stat_round event;
1434
1435	event.header.type = PERF_RECORD_STAT_ROUND;
1436	event.header.size = sizeof(event);
1437	event.header.misc = 0;
1438
1439	event.time = evtime;
1440	event.type = type;
1441
1442	return process(tool, (union perf_event *) &event, NULL, machine);
1443}
1444
1445size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type, u64 read_format)
1446{
1447	size_t sz, result = sizeof(struct perf_record_sample);
1448
1449	if (type & PERF_SAMPLE_IDENTIFIER)
1450		result += sizeof(u64);
1451
1452	if (type & PERF_SAMPLE_IP)
1453		result += sizeof(u64);
1454
1455	if (type & PERF_SAMPLE_TID)
1456		result += sizeof(u64);
1457
1458	if (type & PERF_SAMPLE_TIME)
1459		result += sizeof(u64);
1460
1461	if (type & PERF_SAMPLE_ADDR)
1462		result += sizeof(u64);
1463
1464	if (type & PERF_SAMPLE_ID)
1465		result += sizeof(u64);
1466
1467	if (type & PERF_SAMPLE_STREAM_ID)
1468		result += sizeof(u64);
1469
1470	if (type & PERF_SAMPLE_CPU)
1471		result += sizeof(u64);
1472
1473	if (type & PERF_SAMPLE_PERIOD)
1474		result += sizeof(u64);
1475
1476	if (type & PERF_SAMPLE_READ) {
1477		result += sizeof(u64);
1478		if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1479			result += sizeof(u64);
1480		if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1481			result += sizeof(u64);
1482		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1483		if (read_format & PERF_FORMAT_GROUP) {
1484			sz = sample_read_value_size(read_format);
1485			result += sz * sample->read.group.nr;
 
1486		} else {
1487			result += sizeof(u64);
1488			if (read_format & PERF_FORMAT_LOST)
1489				result += sizeof(u64);
1490		}
1491	}
1492
1493	if (type & PERF_SAMPLE_CALLCHAIN) {
1494		sz = (sample->callchain->nr + 1) * sizeof(u64);
1495		result += sz;
1496	}
1497
1498	if (type & PERF_SAMPLE_RAW) {
1499		result += sizeof(u32);
1500		result += sample->raw_size;
1501	}
1502
1503	if (type & PERF_SAMPLE_BRANCH_STACK) {
1504		sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1505		/* nr, hw_idx */
1506		sz += 2 * sizeof(u64);
1507		result += sz;
1508	}
1509
1510	if (type & PERF_SAMPLE_REGS_USER) {
1511		if (sample->user_regs.abi) {
1512			result += sizeof(u64);
1513			sz = hweight64(sample->user_regs.mask) * sizeof(u64);
1514			result += sz;
1515		} else {
1516			result += sizeof(u64);
1517		}
1518	}
1519
1520	if (type & PERF_SAMPLE_STACK_USER) {
1521		sz = sample->user_stack.size;
1522		result += sizeof(u64);
1523		if (sz) {
1524			result += sz;
1525			result += sizeof(u64);
1526		}
1527	}
1528
1529	if (type & PERF_SAMPLE_WEIGHT_TYPE)
1530		result += sizeof(u64);
1531
1532	if (type & PERF_SAMPLE_DATA_SRC)
1533		result += sizeof(u64);
1534
1535	if (type & PERF_SAMPLE_TRANSACTION)
1536		result += sizeof(u64);
1537
1538	if (type & PERF_SAMPLE_REGS_INTR) {
1539		if (sample->intr_regs.abi) {
1540			result += sizeof(u64);
1541			sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
1542			result += sz;
1543		} else {
1544			result += sizeof(u64);
1545		}
1546	}
1547
1548	if (type & PERF_SAMPLE_PHYS_ADDR)
1549		result += sizeof(u64);
1550
1551	if (type & PERF_SAMPLE_CGROUP)
1552		result += sizeof(u64);
1553
1554	if (type & PERF_SAMPLE_DATA_PAGE_SIZE)
1555		result += sizeof(u64);
1556
1557	if (type & PERF_SAMPLE_CODE_PAGE_SIZE)
1558		result += sizeof(u64);
1559
1560	if (type & PERF_SAMPLE_AUX) {
1561		result += sizeof(u64);
1562		result += sample->aux_sample.size;
1563	}
1564
1565	return result;
1566}
1567
1568void __weak arch_perf_synthesize_sample_weight(const struct perf_sample *data,
1569					       __u64 *array, u64 type __maybe_unused)
1570{
1571	*array = data->weight;
1572}
1573
1574static __u64 *copy_read_group_values(__u64 *array, __u64 read_format,
1575				     const struct perf_sample *sample)
1576{
1577	size_t sz = sample_read_value_size(read_format);
1578	struct sample_read_value *v = sample->read.group.values;
1579
1580	sample_read_group__for_each(v, sample->read.group.nr, read_format) {
1581		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1582		memcpy(array, v, sz);
1583		array = (void *)array + sz;
1584	}
1585	return array;
1586}
1587
1588int perf_event__synthesize_sample(union perf_event *event, u64 type, u64 read_format,
1589				  const struct perf_sample *sample)
1590{
1591	__u64 *array;
1592	size_t sz;
1593	/*
1594	 * used for cross-endian analysis. See git commit 65014ab3
1595	 * for why this goofiness is needed.
1596	 */
1597	union u64_swap u;
1598
1599	array = event->sample.array;
1600
1601	if (type & PERF_SAMPLE_IDENTIFIER) {
1602		*array = sample->id;
1603		array++;
1604	}
1605
1606	if (type & PERF_SAMPLE_IP) {
1607		*array = sample->ip;
1608		array++;
1609	}
1610
1611	if (type & PERF_SAMPLE_TID) {
1612		u.val32[0] = sample->pid;
1613		u.val32[1] = sample->tid;
1614		*array = u.val64;
1615		array++;
1616	}
1617
1618	if (type & PERF_SAMPLE_TIME) {
1619		*array = sample->time;
1620		array++;
1621	}
1622
1623	if (type & PERF_SAMPLE_ADDR) {
1624		*array = sample->addr;
1625		array++;
1626	}
1627
1628	if (type & PERF_SAMPLE_ID) {
1629		*array = sample->id;
1630		array++;
1631	}
1632
1633	if (type & PERF_SAMPLE_STREAM_ID) {
1634		*array = sample->stream_id;
1635		array++;
1636	}
1637
1638	if (type & PERF_SAMPLE_CPU) {
1639		u.val32[0] = sample->cpu;
1640		u.val32[1] = 0;
1641		*array = u.val64;
1642		array++;
1643	}
1644
1645	if (type & PERF_SAMPLE_PERIOD) {
1646		*array = sample->period;
1647		array++;
1648	}
1649
1650	if (type & PERF_SAMPLE_READ) {
1651		if (read_format & PERF_FORMAT_GROUP)
1652			*array = sample->read.group.nr;
1653		else
1654			*array = sample->read.one.value;
1655		array++;
1656
1657		if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1658			*array = sample->read.time_enabled;
1659			array++;
1660		}
1661
1662		if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1663			*array = sample->read.time_running;
1664			array++;
1665		}
1666
1667		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1668		if (read_format & PERF_FORMAT_GROUP) {
1669			array = copy_read_group_values(array, read_format,
1670						       sample);
 
 
1671		} else {
1672			*array = sample->read.one.id;
1673			array++;
1674
1675			if (read_format & PERF_FORMAT_LOST) {
1676				*array = sample->read.one.lost;
1677				array++;
1678			}
1679		}
1680	}
1681
1682	if (type & PERF_SAMPLE_CALLCHAIN) {
1683		sz = (sample->callchain->nr + 1) * sizeof(u64);
1684		memcpy(array, sample->callchain, sz);
1685		array = (void *)array + sz;
1686	}
1687
1688	if (type & PERF_SAMPLE_RAW) {
1689		u.val32[0] = sample->raw_size;
1690		*array = u.val64;
1691		array = (void *)array + sizeof(u32);
1692
1693		memcpy(array, sample->raw_data, sample->raw_size);
1694		array = (void *)array + sample->raw_size;
1695	}
1696
1697	if (type & PERF_SAMPLE_BRANCH_STACK) {
1698		sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1699		/* nr, hw_idx */
1700		sz += 2 * sizeof(u64);
1701		memcpy(array, sample->branch_stack, sz);
1702		array = (void *)array + sz;
1703	}
1704
1705	if (type & PERF_SAMPLE_REGS_USER) {
1706		if (sample->user_regs.abi) {
1707			*array++ = sample->user_regs.abi;
1708			sz = hweight64(sample->user_regs.mask) * sizeof(u64);
1709			memcpy(array, sample->user_regs.regs, sz);
1710			array = (void *)array + sz;
1711		} else {
1712			*array++ = 0;
1713		}
1714	}
1715
1716	if (type & PERF_SAMPLE_STACK_USER) {
1717		sz = sample->user_stack.size;
1718		*array++ = sz;
1719		if (sz) {
1720			memcpy(array, sample->user_stack.data, sz);
1721			array = (void *)array + sz;
1722			*array++ = sz;
1723		}
1724	}
1725
1726	if (type & PERF_SAMPLE_WEIGHT_TYPE) {
1727		arch_perf_synthesize_sample_weight(sample, array, type);
1728		array++;
1729	}
1730
1731	if (type & PERF_SAMPLE_DATA_SRC) {
1732		*array = sample->data_src;
1733		array++;
1734	}
1735
1736	if (type & PERF_SAMPLE_TRANSACTION) {
1737		*array = sample->transaction;
1738		array++;
1739	}
1740
1741	if (type & PERF_SAMPLE_REGS_INTR) {
1742		if (sample->intr_regs.abi) {
1743			*array++ = sample->intr_regs.abi;
1744			sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
1745			memcpy(array, sample->intr_regs.regs, sz);
1746			array = (void *)array + sz;
1747		} else {
1748			*array++ = 0;
1749		}
1750	}
1751
1752	if (type & PERF_SAMPLE_PHYS_ADDR) {
1753		*array = sample->phys_addr;
1754		array++;
1755	}
1756
1757	if (type & PERF_SAMPLE_CGROUP) {
1758		*array = sample->cgroup;
1759		array++;
1760	}
1761
1762	if (type & PERF_SAMPLE_DATA_PAGE_SIZE) {
1763		*array = sample->data_page_size;
1764		array++;
1765	}
1766
1767	if (type & PERF_SAMPLE_CODE_PAGE_SIZE) {
1768		*array = sample->code_page_size;
1769		array++;
1770	}
1771
1772	if (type & PERF_SAMPLE_AUX) {
1773		sz = sample->aux_sample.size;
1774		*array++ = sz;
1775		memcpy(array, sample->aux_sample.data, sz);
1776		array = (void *)array + sz;
1777	}
1778
1779	return 0;
1780}
1781
1782int perf_event__synthesize_id_sample(__u64 *array, u64 type, const struct perf_sample *sample)
1783{
1784	__u64 *start = array;
1785
1786	/*
1787	 * used for cross-endian analysis. See git commit 65014ab3
1788	 * for why this goofiness is needed.
1789	 */
1790	union u64_swap u;
1791
1792	if (type & PERF_SAMPLE_TID) {
1793		u.val32[0] = sample->pid;
1794		u.val32[1] = sample->tid;
1795		*array = u.val64;
1796		array++;
1797	}
1798
1799	if (type & PERF_SAMPLE_TIME) {
1800		*array = sample->time;
1801		array++;
1802	}
1803
1804	if (type & PERF_SAMPLE_ID) {
1805		*array = sample->id;
1806		array++;
1807	}
1808
1809	if (type & PERF_SAMPLE_STREAM_ID) {
1810		*array = sample->stream_id;
1811		array++;
1812	}
1813
1814	if (type & PERF_SAMPLE_CPU) {
1815		u.val32[0] = sample->cpu;
1816		u.val32[1] = 0;
1817		*array = u.val64;
1818		array++;
1819	}
1820
1821	if (type & PERF_SAMPLE_IDENTIFIER) {
1822		*array = sample->id;
1823		array++;
1824	}
1825
1826	return (void *)array - (void *)start;
1827}
1828
1829int __perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process,
1830				      struct evlist *evlist, struct machine *machine, size_t from)
1831{
1832	union perf_event *ev;
1833	struct evsel *evsel;
1834	size_t nr = 0, i = 0, sz, max_nr, n, pos;
1835	size_t e1_sz = sizeof(struct id_index_entry);
1836	size_t e2_sz = sizeof(struct id_index_entry_2);
1837	size_t etot_sz = e1_sz + e2_sz;
1838	bool e2_needed = false;
1839	int err;
1840
1841	max_nr = (UINT16_MAX - sizeof(struct perf_record_id_index)) / etot_sz;
1842
1843	pos = 0;
1844	evlist__for_each_entry(evlist, evsel) {
1845		if (pos++ < from)
1846			continue;
1847		nr += evsel->core.ids;
1848	}
1849
1850	if (!nr)
1851		return 0;
1852
1853	pr_debug2("Synthesizing id index\n");
 
1854
1855	n = nr > max_nr ? max_nr : nr;
1856	sz = sizeof(struct perf_record_id_index) + n * etot_sz;
1857	ev = zalloc(sz);
1858	if (!ev)
1859		return -ENOMEM;
1860
1861	sz = sizeof(struct perf_record_id_index) + n * e1_sz;
1862
1863	ev->id_index.header.type = PERF_RECORD_ID_INDEX;
 
1864	ev->id_index.nr = n;
1865
1866	pos = 0;
1867	evlist__for_each_entry(evlist, evsel) {
1868		u32 j;
1869
1870		if (pos++ < from)
1871			continue;
1872		for (j = 0; j < evsel->core.ids; j++, i++) {
1873			struct id_index_entry *e;
1874			struct id_index_entry_2 *e2;
1875			struct perf_sample_id *sid;
1876
1877			if (i >= n) {
1878				ev->id_index.header.size = sz + (e2_needed ? n * e2_sz : 0);
1879				err = process(tool, ev, NULL, machine);
1880				if (err)
1881					goto out_err;
1882				nr -= n;
1883				i = 0;
1884				e2_needed = false;
1885			}
1886
1887			e = &ev->id_index.entries[i];
1888
1889			e->id = evsel->core.id[j];
1890
1891			sid = evlist__id2sid(evlist, e->id);
1892			if (!sid) {
1893				free(ev);
1894				return -ENOENT;
1895			}
1896
1897			e->idx = sid->idx;
1898			e->cpu = sid->cpu.cpu;
1899			e->tid = sid->tid;
1900
1901			if (sid->machine_pid)
1902				e2_needed = true;
1903
1904			e2 = (void *)ev + sz;
1905			e2[i].machine_pid = sid->machine_pid;
1906			e2[i].vcpu        = sid->vcpu.cpu;
1907		}
1908	}
1909
1910	sz = sizeof(struct perf_record_id_index) + nr * e1_sz;
1911	ev->id_index.header.size = sz + (e2_needed ? nr * e2_sz : 0);
1912	ev->id_index.nr = nr;
1913
1914	err = process(tool, ev, NULL, machine);
1915out_err:
1916	free(ev);
1917
1918	return err;
1919}
1920
1921int perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process,
1922				    struct evlist *evlist, struct machine *machine)
1923{
1924	return __perf_event__synthesize_id_index(tool, process, evlist, machine, 0);
1925}
1926
1927int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
1928				  struct target *target, struct perf_thread_map *threads,
1929				  perf_event__handler_t process, bool needs_mmap,
1930				  bool data_mmap, unsigned int nr_threads_synthesize)
1931{
1932	/*
1933	 * When perf runs in non-root PID namespace, and the namespace's proc FS
1934	 * is not mounted, nsinfo__is_in_root_namespace() returns false.
1935	 * In this case, the proc FS is coming for the parent namespace, thus
1936	 * perf tool will wrongly gather process info from its parent PID
1937	 * namespace.
1938	 *
1939	 * To avoid the confusion that the perf tool runs in a child PID
1940	 * namespace but it synthesizes thread info from its parent PID
1941	 * namespace, returns failure with warning.
1942	 */
1943	if (!nsinfo__is_in_root_namespace()) {
1944		pr_err("Perf runs in non-root PID namespace but it tries to ");
1945		pr_err("gather process info from its parent PID namespace.\n");
1946		pr_err("Please mount the proc file system properly, e.g. ");
1947		pr_err("add the option '--mount-proc' for unshare command.\n");
1948		return -EPERM;
1949	}
1950
1951	if (target__has_task(target))
1952		return perf_event__synthesize_thread_map(tool, threads, process, machine,
1953							 needs_mmap, data_mmap);
1954	else if (target__has_cpu(target))
1955		return perf_event__synthesize_threads(tool, process, machine,
1956						      needs_mmap, data_mmap,
1957						      nr_threads_synthesize);
1958	/* command specified */
1959	return 0;
1960}
1961
1962int machine__synthesize_threads(struct machine *machine, struct target *target,
1963				struct perf_thread_map *threads, bool needs_mmap,
1964				bool data_mmap, unsigned int nr_threads_synthesize)
1965{
1966	return __machine__synthesize_threads(machine, NULL, target, threads,
1967					     perf_event__process, needs_mmap,
1968					     data_mmap, nr_threads_synthesize);
1969}
1970
1971static struct perf_record_event_update *event_update_event__new(size_t size, u64 type, u64 id)
1972{
1973	struct perf_record_event_update *ev;
1974
1975	size += sizeof(*ev);
1976	size  = PERF_ALIGN(size, sizeof(u64));
1977
1978	ev = zalloc(size);
1979	if (ev) {
1980		ev->header.type = PERF_RECORD_EVENT_UPDATE;
1981		ev->header.size = (u16)size;
1982		ev->type	= type;
1983		ev->id		= id;
1984	}
1985	return ev;
1986}
1987
1988int perf_event__synthesize_event_update_unit(struct perf_tool *tool, struct evsel *evsel,
1989					     perf_event__handler_t process)
1990{
1991	size_t size = strlen(evsel->unit);
1992	struct perf_record_event_update *ev;
1993	int err;
1994
1995	ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->core.id[0]);
1996	if (ev == NULL)
1997		return -ENOMEM;
1998
1999	strlcpy(ev->unit, evsel->unit, size + 1);
2000	err = process(tool, (union perf_event *)ev, NULL, NULL);
2001	free(ev);
2002	return err;
2003}
2004
2005int perf_event__synthesize_event_update_scale(struct perf_tool *tool, struct evsel *evsel,
2006					      perf_event__handler_t process)
2007{
2008	struct perf_record_event_update *ev;
2009	struct perf_record_event_update_scale *ev_data;
2010	int err;
2011
2012	ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->core.id[0]);
2013	if (ev == NULL)
2014		return -ENOMEM;
2015
2016	ev->scale.scale = evsel->scale;
 
2017	err = process(tool, (union perf_event *)ev, NULL, NULL);
2018	free(ev);
2019	return err;
2020}
2021
2022int perf_event__synthesize_event_update_name(struct perf_tool *tool, struct evsel *evsel,
2023					     perf_event__handler_t process)
2024{
2025	struct perf_record_event_update *ev;
2026	size_t len = strlen(evsel__name(evsel));
2027	int err;
2028
2029	ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->core.id[0]);
2030	if (ev == NULL)
2031		return -ENOMEM;
2032
2033	strlcpy(ev->name, evsel->name, len + 1);
2034	err = process(tool, (union perf_event *)ev, NULL, NULL);
2035	free(ev);
2036	return err;
2037}
2038
2039int perf_event__synthesize_event_update_cpus(struct perf_tool *tool, struct evsel *evsel,
2040					     perf_event__handler_t process)
2041{
2042	struct synthesize_cpu_map_data syn_data = { .map = evsel->core.own_cpus };
2043	struct perf_record_event_update *ev;
2044	int err;
 
 
 
 
2045
2046	ev = cpu_map_data__alloc(&syn_data, sizeof(struct perf_event_header) + 2 * sizeof(u64));
2047	if (!ev)
2048		return -ENOMEM;
2049
2050	syn_data.data = &ev->cpus.cpus;
2051	ev->header.type = PERF_RECORD_EVENT_UPDATE;
2052	ev->header.size = (u16)syn_data.size;
2053	ev->type	= PERF_EVENT_UPDATE__CPUS;
2054	ev->id		= evsel->core.id[0];
2055	cpu_map_data__synthesize(&syn_data);
 
 
2056
2057	err = process(tool, (union perf_event *)ev, NULL, NULL);
2058	free(ev);
2059	return err;
2060}
2061
2062int perf_event__synthesize_attrs(struct perf_tool *tool, struct evlist *evlist,
2063				 perf_event__handler_t process)
2064{
2065	struct evsel *evsel;
2066	int err = 0;
2067
2068	evlist__for_each_entry(evlist, evsel) {
2069		err = perf_event__synthesize_attr(tool, &evsel->core.attr, evsel->core.ids,
2070						  evsel->core.id, process);
2071		if (err) {
2072			pr_debug("failed to create perf header attribute\n");
2073			return err;
2074		}
2075	}
2076
2077	return err;
2078}
2079
2080static bool has_unit(struct evsel *evsel)
2081{
2082	return evsel->unit && *evsel->unit;
2083}
2084
2085static bool has_scale(struct evsel *evsel)
2086{
2087	return evsel->scale != 1;
2088}
2089
2090int perf_event__synthesize_extra_attr(struct perf_tool *tool, struct evlist *evsel_list,
2091				      perf_event__handler_t process, bool is_pipe)
2092{
2093	struct evsel *evsel;
2094	int err;
2095
2096	/*
2097	 * Synthesize other events stuff not carried within
2098	 * attr event - unit, scale, name
2099	 */
2100	evlist__for_each_entry(evsel_list, evsel) {
2101		if (!evsel->supported)
2102			continue;
2103
2104		/*
2105		 * Synthesize unit and scale only if it's defined.
2106		 */
2107		if (has_unit(evsel)) {
2108			err = perf_event__synthesize_event_update_unit(tool, evsel, process);
2109			if (err < 0) {
2110				pr_err("Couldn't synthesize evsel unit.\n");
2111				return err;
2112			}
2113		}
2114
2115		if (has_scale(evsel)) {
2116			err = perf_event__synthesize_event_update_scale(tool, evsel, process);
2117			if (err < 0) {
2118				pr_err("Couldn't synthesize evsel evsel.\n");
2119				return err;
2120			}
2121		}
2122
2123		if (evsel->core.own_cpus) {
2124			err = perf_event__synthesize_event_update_cpus(tool, evsel, process);
2125			if (err < 0) {
2126				pr_err("Couldn't synthesize evsel cpus.\n");
2127				return err;
2128			}
2129		}
2130
2131		/*
2132		 * Name is needed only for pipe output,
2133		 * perf.data carries event names.
2134		 */
2135		if (is_pipe) {
2136			err = perf_event__synthesize_event_update_name(tool, evsel, process);
2137			if (err < 0) {
2138				pr_err("Couldn't synthesize evsel name.\n");
2139				return err;
2140			}
2141		}
2142	}
2143	return 0;
2144}
2145
2146int perf_event__synthesize_attr(struct perf_tool *tool, struct perf_event_attr *attr,
2147				u32 ids, u64 *id, perf_event__handler_t process)
2148{
2149	union perf_event *ev;
2150	size_t size;
2151	int err;
2152
2153	size = sizeof(struct perf_event_attr);
2154	size = PERF_ALIGN(size, sizeof(u64));
2155	size += sizeof(struct perf_event_header);
2156	size += ids * sizeof(u64);
2157
2158	ev = zalloc(size);
2159
2160	if (ev == NULL)
2161		return -ENOMEM;
2162
2163	ev->attr.attr = *attr;
2164	memcpy(perf_record_header_attr_id(ev), id, ids * sizeof(u64));
2165
2166	ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
2167	ev->attr.header.size = (u16)size;
2168
2169	if (ev->attr.header.size == size)
2170		err = process(tool, ev, NULL, NULL);
2171	else
2172		err = -E2BIG;
2173
2174	free(ev);
2175
2176	return err;
2177}
2178
2179#ifdef HAVE_LIBTRACEEVENT
2180int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd, struct evlist *evlist,
2181					perf_event__handler_t process)
2182{
2183	union perf_event ev;
2184	struct tracing_data *tdata;
2185	ssize_t size = 0, aligned_size = 0, padding;
2186	struct feat_fd ff;
2187
2188	/*
2189	 * We are going to store the size of the data followed
2190	 * by the data contents. Since the fd descriptor is a pipe,
2191	 * we cannot seek back to store the size of the data once
2192	 * we know it. Instead we:
2193	 *
2194	 * - write the tracing data to the temp file
2195	 * - get/write the data size to pipe
2196	 * - write the tracing data from the temp file
2197	 *   to the pipe
2198	 */
2199	tdata = tracing_data_get(&evlist->core.entries, fd, true);
2200	if (!tdata)
2201		return -1;
2202
2203	memset(&ev, 0, sizeof(ev));
2204
2205	ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
2206	size = tdata->size;
2207	aligned_size = PERF_ALIGN(size, sizeof(u64));
2208	padding = aligned_size - size;
2209	ev.tracing_data.header.size = sizeof(ev.tracing_data);
2210	ev.tracing_data.size = aligned_size;
2211
2212	process(tool, &ev, NULL, NULL);
2213
2214	/*
2215	 * The put function will copy all the tracing data
2216	 * stored in temp file to the pipe.
2217	 */
2218	tracing_data_put(tdata);
2219
2220	ff = (struct feat_fd){ .fd = fd };
2221	if (write_padded(&ff, NULL, 0, padding))
2222		return -1;
2223
2224	return aligned_size;
2225}
2226#endif
2227
2228int perf_event__synthesize_build_id(struct perf_tool *tool, struct dso *pos, u16 misc,
2229				    perf_event__handler_t process, struct machine *machine)
2230{
2231	union perf_event ev;
2232	size_t len;
2233
2234	if (!pos->hit)
2235		return 0;
2236
2237	memset(&ev, 0, sizeof(ev));
2238
2239	len = pos->long_name_len + 1;
2240	len = PERF_ALIGN(len, NAME_ALIGN);
2241	ev.build_id.size = min(pos->bid.size, sizeof(pos->bid.data));
2242	memcpy(&ev.build_id.build_id, pos->bid.data, ev.build_id.size);
2243	ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
2244	ev.build_id.header.misc = misc | PERF_RECORD_MISC_BUILD_ID_SIZE;
2245	ev.build_id.pid = machine->pid;
2246	ev.build_id.header.size = sizeof(ev.build_id) + len;
2247	memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
2248
2249	return process(tool, &ev, NULL, machine);
2250}
2251
2252int perf_event__synthesize_stat_events(struct perf_stat_config *config, struct perf_tool *tool,
2253				       struct evlist *evlist, perf_event__handler_t process, bool attrs)
2254{
2255	int err;
2256
2257	if (attrs) {
2258		err = perf_event__synthesize_attrs(tool, evlist, process);
2259		if (err < 0) {
2260			pr_err("Couldn't synthesize attrs.\n");
2261			return err;
2262		}
2263	}
2264
2265	err = perf_event__synthesize_extra_attr(tool, evlist, process, attrs);
2266	err = perf_event__synthesize_thread_map2(tool, evlist->core.threads, process, NULL);
2267	if (err < 0) {
2268		pr_err("Couldn't synthesize thread map.\n");
2269		return err;
2270	}
2271
2272	err = perf_event__synthesize_cpu_map(tool, evlist->core.user_requested_cpus, process, NULL);
2273	if (err < 0) {
2274		pr_err("Couldn't synthesize thread map.\n");
2275		return err;
2276	}
2277
2278	err = perf_event__synthesize_stat_config(tool, config, process, NULL);
2279	if (err < 0) {
2280		pr_err("Couldn't synthesize config.\n");
2281		return err;
2282	}
2283
2284	return 0;
2285}
2286
2287extern const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE];
2288
2289int perf_event__synthesize_features(struct perf_tool *tool, struct perf_session *session,
2290				    struct evlist *evlist, perf_event__handler_t process)
2291{
2292	struct perf_header *header = &session->header;
2293	struct perf_record_header_feature *fe;
2294	struct feat_fd ff;
2295	size_t sz, sz_hdr;
2296	int feat, ret;
2297
2298	sz_hdr = sizeof(fe->header);
2299	sz = sizeof(union perf_event);
2300	/* get a nice alignment */
2301	sz = PERF_ALIGN(sz, page_size);
2302
2303	memset(&ff, 0, sizeof(ff));
2304
2305	ff.buf = malloc(sz);
2306	if (!ff.buf)
2307		return -ENOMEM;
2308
2309	ff.size = sz - sz_hdr;
2310	ff.ph = &session->header;
2311
2312	for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
2313		if (!feat_ops[feat].synthesize) {
2314			pr_debug("No record header feature for header :%d\n", feat);
2315			continue;
2316		}
2317
2318		ff.offset = sizeof(*fe);
2319
2320		ret = feat_ops[feat].write(&ff, evlist);
2321		if (ret || ff.offset <= (ssize_t)sizeof(*fe)) {
2322			pr_debug("Error writing feature\n");
2323			continue;
2324		}
2325		/* ff.buf may have changed due to realloc in do_write() */
2326		fe = ff.buf;
2327		memset(fe, 0, sizeof(*fe));
2328
2329		fe->feat_id = feat;
2330		fe->header.type = PERF_RECORD_HEADER_FEATURE;
2331		fe->header.size = ff.offset;
2332
2333		ret = process(tool, ff.buf, NULL, NULL);
2334		if (ret) {
2335			free(ff.buf);
2336			return ret;
2337		}
2338	}
2339
2340	/* Send HEADER_LAST_FEATURE mark. */
2341	fe = ff.buf;
2342	fe->feat_id     = HEADER_LAST_FEATURE;
2343	fe->header.type = PERF_RECORD_HEADER_FEATURE;
2344	fe->header.size = sizeof(*fe);
2345
2346	ret = process(tool, ff.buf, NULL, NULL);
2347
2348	free(ff.buf);
2349	return ret;
2350}
2351
2352int perf_event__synthesize_for_pipe(struct perf_tool *tool,
2353				    struct perf_session *session,
2354				    struct perf_data *data,
2355				    perf_event__handler_t process)
2356{
2357	int err;
2358	int ret = 0;
2359	struct evlist *evlist = session->evlist;
2360
2361	/*
2362	 * We need to synthesize events first, because some
2363	 * features works on top of them (on report side).
2364	 */
2365	err = perf_event__synthesize_attrs(tool, evlist, process);
2366	if (err < 0) {
2367		pr_err("Couldn't synthesize attrs.\n");
2368		return err;
2369	}
2370	ret += err;
2371
2372	err = perf_event__synthesize_features(tool, session, evlist, process);
2373	if (err < 0) {
2374		pr_err("Couldn't synthesize features.\n");
2375		return err;
2376	}
2377	ret += err;
2378
2379#ifdef HAVE_LIBTRACEEVENT
2380	if (have_tracepoints(&evlist->core.entries)) {
2381		int fd = perf_data__fd(data);
2382
2383		/*
2384		 * FIXME err <= 0 here actually means that
2385		 * there were no tracepoints so its not really
2386		 * an error, just that we don't need to
2387		 * synthesize anything.  We really have to
2388		 * return this more properly and also
2389		 * propagate errors that now are calling die()
2390		 */
2391		err = perf_event__synthesize_tracing_data(tool,	fd, evlist,
2392							  process);
2393		if (err <= 0) {
2394			pr_err("Couldn't record tracing data.\n");
2395			return err;
2396		}
2397		ret += err;
2398	}
2399#else
2400	(void)data;
2401#endif
2402
2403	return ret;
2404}
2405
2406int parse_synth_opt(char *synth)
2407{
2408	char *p, *q;
2409	int ret = 0;
2410
2411	if (synth == NULL)
2412		return -1;
2413
2414	for (q = synth; (p = strsep(&q, ",")); p = q) {
2415		if (!strcasecmp(p, "no") || !strcasecmp(p, "none"))
2416			return 0;
2417
2418		if (!strcasecmp(p, "all"))
2419			return PERF_SYNTH_ALL;
2420
2421		if (!strcasecmp(p, "task"))
2422			ret |= PERF_SYNTH_TASK;
2423		else if (!strcasecmp(p, "mmap"))
2424			ret |= PERF_SYNTH_TASK | PERF_SYNTH_MMAP;
2425		else if (!strcasecmp(p, "cgroup"))
2426			ret |= PERF_SYNTH_CGROUP;
2427		else
2428			return -1;
2429	}
2430
2431	return ret;
2432}