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
 668int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t process,
 669				   struct machine *machine)
 670{
 671	int rc = 0;
 672	struct map *pos;
 673	struct maps *maps = machine__kernel_maps(machine);
 674	union perf_event *event;
 675	size_t size = symbol_conf.buildid_mmap2 ?
 676			sizeof(event->mmap2) : sizeof(event->mmap);
 677
 678	event = zalloc(size + machine->id_hdr_size);
 679	if (event == NULL) {
 680		pr_debug("Not enough memory synthesizing mmap event "
 681			 "for kernel modules\n");
 682		return -1;
 683	}
 684
 
 
 685	/*
 686	 * kernel uses 0 for user space maps, see kernel/perf_event.c
 687	 * __perf_event_mmap
 688	 */
 689	if (machine__is_host(machine))
 690		event->header.misc = PERF_RECORD_MISC_KERNEL;
 691	else
 692		event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 693
 694	maps__for_each_entry(maps, pos) {
 
 
 695		if (!__map__is_kmodule(pos))
 696			continue;
 697
 698		if (symbol_conf.buildid_mmap2) {
 699			size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
 700			event->mmap2.header.type = PERF_RECORD_MMAP2;
 701			event->mmap2.header.size = (sizeof(event->mmap2) -
 702						(sizeof(event->mmap2.filename) - size));
 703			memset(event->mmap2.filename + size, 0, machine->id_hdr_size);
 704			event->mmap2.header.size += machine->id_hdr_size;
 705			event->mmap2.start = pos->start;
 706			event->mmap2.len   = pos->end - pos->start;
 707			event->mmap2.pid   = machine->pid;
 708
 709			memcpy(event->mmap2.filename, pos->dso->long_name,
 710			       pos->dso->long_name_len + 1);
 711
 712			perf_record_mmap2__read_build_id(&event->mmap2, machine, false);
 713		} else {
 714			size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
 715			event->mmap.header.type = PERF_RECORD_MMAP;
 716			event->mmap.header.size = (sizeof(event->mmap) -
 717						(sizeof(event->mmap.filename) - size));
 718			memset(event->mmap.filename + size, 0, machine->id_hdr_size);
 719			event->mmap.header.size += machine->id_hdr_size;
 720			event->mmap.start = pos->start;
 721			event->mmap.len   = pos->end - pos->start;
 722			event->mmap.pid   = machine->pid;
 723
 724			memcpy(event->mmap.filename, pos->dso->long_name,
 725			       pos->dso->long_name_len + 1);
 726		}
 727
 
 
 728		if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
 729			rc = -1;
 730			break;
 731		}
 732	}
 733
 734	free(event);
 735	return rc;
 736}
 737
 738static int filter_task(const struct dirent *dirent)
 739{
 740	return isdigit(dirent->d_name[0]);
 741}
 742
 743static int __event__synthesize_thread(union perf_event *comm_event,
 744				      union perf_event *mmap_event,
 745				      union perf_event *fork_event,
 746				      union perf_event *namespaces_event,
 747				      pid_t pid, int full, perf_event__handler_t process,
 748				      struct perf_tool *tool, struct machine *machine,
 749				      bool needs_mmap, bool mmap_data)
 750{
 751	char filename[PATH_MAX];
 752	struct dirent **dirent;
 
 753	pid_t tgid, ppid;
 754	int rc = 0;
 755	int i, n;
 756
 757	/* special case: only send one comm event using passed in pid */
 758	if (!full) {
 759		tgid = perf_event__synthesize_comm(tool, comm_event, pid,
 760						   process, machine);
 761
 762		if (tgid == -1)
 763			return -1;
 764
 765		if (perf_event__synthesize_namespaces(tool, namespaces_event, pid,
 766						      tgid, process, machine) < 0)
 767			return -1;
 768
 769		/*
 770		 * send mmap only for thread group leader
 771		 * see thread__init_maps()
 772		 */
 773		if (pid == tgid && needs_mmap &&
 774		    perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 775						       process, machine, mmap_data))
 776			return -1;
 777
 778		return 0;
 779	}
 780
 781	if (machine__is_default_guest(machine))
 782		return 0;
 783
 784	snprintf(filename, sizeof(filename), "%s/proc/%d/task",
 785		 machine->root_dir, pid);
 786
 787	n = scandir(filename, &dirent, filter_task, NULL);
 788	if (n < 0)
 789		return n;
 
 
 790
 791	for (i = 0; i < n; i++) {
 792		char *end;
 793		pid_t _pid;
 794		bool kernel_thread = false;
 795
 796		_pid = strtol(dirent[i]->d_name, &end, 10);
 797		if (*end)
 798			continue;
 799
 800		/* some threads may exit just after scan, ignore it */
 801		if (perf_event__prepare_comm(comm_event, pid, _pid, machine,
 802					     &tgid, &ppid, &kernel_thread) != 0)
 803			continue;
 804
 805		rc = -1;
 
 
 
 
 806		if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
 807						ppid, process, machine) < 0)
 808			break;
 809
 810		if (perf_event__synthesize_namespaces(tool, namespaces_event, _pid,
 811						      tgid, process, machine) < 0)
 812			break;
 813
 814		/*
 815		 * Send the prepared comm event
 816		 */
 817		if (perf_tool__process_synth_event(tool, comm_event, machine, process) != 0)
 818			break;
 819
 820		rc = 0;
 821		if (_pid == pid && !kernel_thread && needs_mmap) {
 822			/* process the parent's maps too */
 823			rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 824						process, machine, mmap_data);
 825			if (rc)
 826				break;
 827		}
 828	}
 829
 830	for (i = 0; i < n; i++)
 831		zfree(&dirent[i]);
 832	free(dirent);
 833
 834	return rc;
 835}
 836
 837int perf_event__synthesize_thread_map(struct perf_tool *tool,
 838				      struct perf_thread_map *threads,
 839				      perf_event__handler_t process,
 840				      struct machine *machine,
 841				      bool needs_mmap, bool mmap_data)
 842{
 843	union perf_event *comm_event, *mmap_event, *fork_event;
 844	union perf_event *namespaces_event;
 845	int err = -1, thread, j;
 846
 847	comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 848	if (comm_event == NULL)
 849		goto out;
 850
 851	mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
 852	if (mmap_event == NULL)
 853		goto out_free_comm;
 854
 855	fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
 856	if (fork_event == NULL)
 857		goto out_free_mmap;
 858
 859	namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
 860				  (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 861				  machine->id_hdr_size);
 862	if (namespaces_event == NULL)
 863		goto out_free_fork;
 864
 865	err = 0;
 866	for (thread = 0; thread < threads->nr; ++thread) {
 867		if (__event__synthesize_thread(comm_event, mmap_event,
 868					       fork_event, namespaces_event,
 869					       perf_thread_map__pid(threads, thread), 0,
 870					       process, tool, machine,
 871					       needs_mmap, mmap_data)) {
 872			err = -1;
 873			break;
 874		}
 875
 876		/*
 877		 * comm.pid is set to thread group id by
 878		 * perf_event__synthesize_comm
 879		 */
 880		if ((int) comm_event->comm.pid != perf_thread_map__pid(threads, thread)) {
 881			bool need_leader = true;
 882
 883			/* is thread group leader in thread_map? */
 884			for (j = 0; j < threads->nr; ++j) {
 885				if ((int) comm_event->comm.pid == perf_thread_map__pid(threads, j)) {
 886					need_leader = false;
 887					break;
 888				}
 889			}
 890
 891			/* if not, generate events for it */
 892			if (need_leader &&
 893			    __event__synthesize_thread(comm_event, mmap_event,
 894						       fork_event, namespaces_event,
 895						       comm_event->comm.pid, 0,
 896						       process, tool, machine,
 897						       needs_mmap, mmap_data)) {
 898				err = -1;
 899				break;
 900			}
 901		}
 902	}
 903	free(namespaces_event);
 904out_free_fork:
 905	free(fork_event);
 906out_free_mmap:
 907	free(mmap_event);
 908out_free_comm:
 909	free(comm_event);
 910out:
 911	return err;
 912}
 913
 914static int __perf_event__synthesize_threads(struct perf_tool *tool,
 915					    perf_event__handler_t process,
 916					    struct machine *machine,
 917					    bool needs_mmap,
 918					    bool mmap_data,
 919					    struct dirent **dirent,
 920					    int start,
 921					    int num)
 922{
 923	union perf_event *comm_event, *mmap_event, *fork_event;
 924	union perf_event *namespaces_event;
 925	int err = -1;
 926	char *end;
 927	pid_t pid;
 928	int i;
 929
 930	comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 931	if (comm_event == NULL)
 932		goto out;
 933
 934	mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
 935	if (mmap_event == NULL)
 936		goto out_free_comm;
 937
 938	fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
 939	if (fork_event == NULL)
 940		goto out_free_mmap;
 941
 942	namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
 943				  (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 944				  machine->id_hdr_size);
 945	if (namespaces_event == NULL)
 946		goto out_free_fork;
 947
 948	for (i = start; i < start + num; i++) {
 949		if (!isdigit(dirent[i]->d_name[0]))
 950			continue;
 951
 952		pid = (pid_t)strtol(dirent[i]->d_name, &end, 10);
 953		/* only interested in proper numerical dirents */
 954		if (*end)
 955			continue;
 956		/*
 957		 * We may race with exiting thread, so don't stop just because
 958		 * one thread couldn't be synthesized.
 959		 */
 960		__event__synthesize_thread(comm_event, mmap_event, fork_event,
 961					   namespaces_event, pid, 1, process,
 962					   tool, machine, needs_mmap, mmap_data);
 963	}
 964	err = 0;
 965
 966	free(namespaces_event);
 967out_free_fork:
 968	free(fork_event);
 969out_free_mmap:
 970	free(mmap_event);
 971out_free_comm:
 972	free(comm_event);
 973out:
 974	return err;
 975}
 976
 977struct synthesize_threads_arg {
 978	struct perf_tool *tool;
 979	perf_event__handler_t process;
 980	struct machine *machine;
 981	bool needs_mmap;
 982	bool mmap_data;
 983	struct dirent **dirent;
 984	int num;
 985	int start;
 986};
 987
 988static void *synthesize_threads_worker(void *arg)
 989{
 990	struct synthesize_threads_arg *args = arg;
 991
 992	__perf_event__synthesize_threads(args->tool, args->process,
 993					 args->machine,
 994					 args->needs_mmap, args->mmap_data,
 995					 args->dirent,
 996					 args->start, args->num);
 997	return NULL;
 998}
 999
1000int perf_event__synthesize_threads(struct perf_tool *tool,
1001				   perf_event__handler_t process,
1002				   struct machine *machine,
1003				   bool needs_mmap, bool mmap_data,
1004				   unsigned int nr_threads_synthesize)
1005{
1006	struct synthesize_threads_arg *args = NULL;
1007	pthread_t *synthesize_threads = NULL;
1008	char proc_path[PATH_MAX];
1009	struct dirent **dirent;
1010	int num_per_thread;
1011	int m, n, i, j;
1012	int thread_nr;
1013	int base = 0;
1014	int err = -1;
1015
1016
1017	if (machine__is_default_guest(machine))
1018		return 0;
1019
1020	snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
1021	n = scandir(proc_path, &dirent, filter_task, NULL);
1022	if (n < 0)
1023		return err;
1024
1025	if (nr_threads_synthesize == UINT_MAX)
1026		thread_nr = sysconf(_SC_NPROCESSORS_ONLN);
1027	else
1028		thread_nr = nr_threads_synthesize;
1029
1030	if (thread_nr <= 1) {
1031		err = __perf_event__synthesize_threads(tool, process,
1032						       machine,
1033						       needs_mmap, mmap_data,
1034						       dirent, base, n);
1035		goto free_dirent;
1036	}
1037	if (thread_nr > n)
1038		thread_nr = n;
1039
1040	synthesize_threads = calloc(sizeof(pthread_t), thread_nr);
1041	if (synthesize_threads == NULL)
1042		goto free_dirent;
1043
1044	args = calloc(sizeof(*args), thread_nr);
1045	if (args == NULL)
1046		goto free_threads;
1047
1048	num_per_thread = n / thread_nr;
1049	m = n % thread_nr;
1050	for (i = 0; i < thread_nr; i++) {
1051		args[i].tool = tool;
1052		args[i].process = process;
1053		args[i].machine = machine;
1054		args[i].needs_mmap = needs_mmap;
1055		args[i].mmap_data = mmap_data;
1056		args[i].dirent = dirent;
1057	}
1058	for (i = 0; i < m; i++) {
1059		args[i].num = num_per_thread + 1;
1060		args[i].start = i * args[i].num;
1061	}
1062	if (i != 0)
1063		base = args[i-1].start + args[i-1].num;
1064	for (j = i; j < thread_nr; j++) {
1065		args[j].num = num_per_thread;
1066		args[j].start = base + (j - i) * args[i].num;
1067	}
1068
1069	for (i = 0; i < thread_nr; i++) {
1070		if (pthread_create(&synthesize_threads[i], NULL,
1071				   synthesize_threads_worker, &args[i]))
1072			goto out_join;
1073	}
1074	err = 0;
1075out_join:
1076	for (i = 0; i < thread_nr; i++)
1077		pthread_join(synthesize_threads[i], NULL);
1078	free(args);
1079free_threads:
1080	free(synthesize_threads);
1081free_dirent:
1082	for (i = 0; i < n; i++)
1083		zfree(&dirent[i]);
1084	free(dirent);
1085
1086	return err;
1087}
1088
1089int __weak perf_event__synthesize_extra_kmaps(struct perf_tool *tool __maybe_unused,
1090					      perf_event__handler_t process __maybe_unused,
1091					      struct machine *machine __maybe_unused)
1092{
1093	return 0;
1094}
1095
1096static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
1097						perf_event__handler_t process,
1098						struct machine *machine)
1099{
1100	union perf_event *event;
1101	size_t size = symbol_conf.buildid_mmap2 ?
1102			sizeof(event->mmap2) : sizeof(event->mmap);
1103	struct map *map = machine__kernel_map(machine);
1104	struct kmap *kmap;
1105	int err;
 
1106
1107	if (map == NULL)
1108		return -1;
1109
1110	kmap = map__kmap(map);
1111	if (!kmap->ref_reloc_sym)
1112		return -1;
1113
1114	/*
1115	 * We should get this from /sys/kernel/sections/.text, but till that is
1116	 * available use this, and after it is use this as a fallback for older
1117	 * kernels.
1118	 */
1119	event = zalloc(size + machine->id_hdr_size);
1120	if (event == NULL) {
1121		pr_debug("Not enough memory synthesizing mmap event "
1122			 "for kernel modules\n");
1123		return -1;
1124	}
1125
1126	if (machine__is_host(machine)) {
1127		/*
1128		 * kernel uses PERF_RECORD_MISC_USER for user space maps,
1129		 * see kernel/perf_event.c __perf_event_mmap
1130		 */
1131		event->header.misc = PERF_RECORD_MISC_KERNEL;
1132	} else {
1133		event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
1134	}
1135
1136	if (symbol_conf.buildid_mmap2) {
1137		size = snprintf(event->mmap2.filename, sizeof(event->mmap2.filename),
1138				"%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
1139		size = PERF_ALIGN(size, sizeof(u64));
1140		event->mmap2.header.type = PERF_RECORD_MMAP2;
1141		event->mmap2.header.size = (sizeof(event->mmap2) -
1142				(sizeof(event->mmap2.filename) - size) + machine->id_hdr_size);
1143		event->mmap2.pgoff = kmap->ref_reloc_sym->addr;
1144		event->mmap2.start = map->start;
1145		event->mmap2.len   = map->end - event->mmap.start;
1146		event->mmap2.pid   = machine->pid;
1147
1148		perf_record_mmap2__read_build_id(&event->mmap2, machine, true);
1149	} else {
1150		size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
1151				"%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
1152		size = PERF_ALIGN(size, sizeof(u64));
1153		event->mmap.header.type = PERF_RECORD_MMAP;
1154		event->mmap.header.size = (sizeof(event->mmap) -
1155				(sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
1156		event->mmap.pgoff = kmap->ref_reloc_sym->addr;
1157		event->mmap.start = map->start;
1158		event->mmap.len   = map->end - event->mmap.start;
1159		event->mmap.pid   = machine->pid;
1160	}
1161
1162	err = perf_tool__process_synth_event(tool, event, machine, process);
1163	free(event);
1164
1165	return err;
1166}
1167
1168int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
1169				       perf_event__handler_t process,
1170				       struct machine *machine)
1171{
1172	int err;
1173
1174	err = __perf_event__synthesize_kernel_mmap(tool, process, machine);
1175	if (err < 0)
1176		return err;
1177
1178	return perf_event__synthesize_extra_kmaps(tool, process, machine);
1179}
1180
1181int perf_event__synthesize_thread_map2(struct perf_tool *tool,
1182				      struct perf_thread_map *threads,
1183				      perf_event__handler_t process,
1184				      struct machine *machine)
1185{
1186	union perf_event *event;
1187	int i, err, size;
1188
1189	size  = sizeof(event->thread_map);
1190	size +=	threads->nr * sizeof(event->thread_map.entries[0]);
1191
1192	event = zalloc(size);
1193	if (!event)
1194		return -ENOMEM;
1195
1196	event->header.type = PERF_RECORD_THREAD_MAP;
1197	event->header.size = size;
1198	event->thread_map.nr = threads->nr;
1199
1200	for (i = 0; i < threads->nr; i++) {
1201		struct perf_record_thread_map_entry *entry = &event->thread_map.entries[i];
1202		char *comm = perf_thread_map__comm(threads, i);
1203
1204		if (!comm)
1205			comm = (char *) "";
1206
1207		entry->pid = perf_thread_map__pid(threads, i);
1208		strncpy((char *) &entry->comm, comm, sizeof(entry->comm));
1209	}
1210
1211	err = process(tool, event, NULL, machine);
1212
1213	free(event);
1214	return err;
1215}
1216
1217struct synthesize_cpu_map_data {
1218	const struct perf_cpu_map *map;
1219	int nr;
1220	int min_cpu;
1221	int max_cpu;
1222	int has_any_cpu;
1223	int type;
1224	size_t size;
1225	struct perf_record_cpu_map_data *data;
1226};
1227
1228static void synthesize_cpus(struct synthesize_cpu_map_data *data)
1229{
1230	data->data->type = PERF_CPU_MAP__CPUS;
1231	data->data->cpus_data.nr = data->nr;
1232	for (int i = 0; i < data->nr; i++)
1233		data->data->cpus_data.cpu[i] = perf_cpu_map__cpu(data->map, i).cpu;
 
 
1234}
1235
1236static void synthesize_mask(struct synthesize_cpu_map_data *data)
 
1237{
1238	int idx;
1239	struct perf_cpu cpu;
1240
1241	/* Due to padding, the 4bytes per entry mask variant is always smaller. */
1242	data->data->type = PERF_CPU_MAP__MASK;
1243	data->data->mask32_data.nr = BITS_TO_U32(data->max_cpu);
1244	data->data->mask32_data.long_size = 4;
1245
1246	perf_cpu_map__for_each_cpu(cpu, idx, data->map) {
1247		int bit_word = cpu.cpu / 32;
1248		u32 bit_mask = 1U << (cpu.cpu & 31);
1249
1250		data->data->mask32_data.mask[bit_word] |= bit_mask;
1251	}
 
1252}
1253
1254static void synthesize_range_cpus(struct synthesize_cpu_map_data *data)
1255{
1256	data->data->type = PERF_CPU_MAP__RANGE_CPUS;
1257	data->data->range_cpu_data.any_cpu = data->has_any_cpu;
1258	data->data->range_cpu_data.start_cpu = data->min_cpu;
1259	data->data->range_cpu_data.end_cpu = data->max_cpu;
 
 
 
 
 
 
 
 
 
1260}
1261
1262static void *cpu_map_data__alloc(struct synthesize_cpu_map_data *syn_data,
1263				 size_t header_size)
1264{
1265	size_t size_cpus, size_mask;
 
1266
1267	syn_data->nr = perf_cpu_map__nr(syn_data->map);
1268	syn_data->has_any_cpu = (perf_cpu_map__cpu(syn_data->map, 0).cpu == -1) ? 1 : 0;
 
 
 
 
 
 
 
 
 
 
 
 
 
1269
1270	syn_data->min_cpu = perf_cpu_map__cpu(syn_data->map, syn_data->has_any_cpu).cpu;
1271	syn_data->max_cpu = perf_cpu_map__max(syn_data->map).cpu;
1272	if (syn_data->max_cpu - syn_data->min_cpu + 1 == syn_data->nr - syn_data->has_any_cpu) {
1273		/* A consecutive range of CPUs can be encoded using a range. */
1274		assert(sizeof(u16) + sizeof(struct perf_record_range_cpu_map) == sizeof(u64));
1275		syn_data->type = PERF_CPU_MAP__RANGE_CPUS;
1276		syn_data->size = header_size + sizeof(u64);
1277		return zalloc(syn_data->size);
1278	}
1279
1280	size_cpus = sizeof(u16) + sizeof(struct cpu_map_entries) + syn_data->nr * sizeof(u16);
1281	/* Due to padding, the 4bytes per entry mask variant is always smaller. */
1282	size_mask = sizeof(u16) + sizeof(struct perf_record_mask_cpu_map32) +
1283		BITS_TO_U32(syn_data->max_cpu) * sizeof(__u32);
1284	if (syn_data->has_any_cpu || size_cpus < size_mask) {
1285		/* Follow the CPU map encoding. */
1286		syn_data->type = PERF_CPU_MAP__CPUS;
1287		syn_data->size = header_size + PERF_ALIGN(size_cpus, sizeof(u64));
1288		return zalloc(syn_data->size);
1289	}
1290	/* Encode using a bitmask. */
1291	syn_data->type = PERF_CPU_MAP__MASK;
1292	syn_data->size = header_size + PERF_ALIGN(size_mask, sizeof(u64));
1293	return zalloc(syn_data->size);
1294}
1295
1296static void cpu_map_data__synthesize(struct synthesize_cpu_map_data *data)
 
1297{
1298	switch (data->type) {
 
 
1299	case PERF_CPU_MAP__CPUS:
1300		synthesize_cpus(data);
1301		break;
1302	case PERF_CPU_MAP__MASK:
1303		synthesize_mask(data);
1304		break;
1305	case PERF_CPU_MAP__RANGE_CPUS:
1306		synthesize_range_cpus(data);
1307		break;
1308	default:
1309		break;
1310	}
1311}
1312
1313static struct perf_record_cpu_map *cpu_map_event__new(const struct perf_cpu_map *map)
1314{
1315	struct synthesize_cpu_map_data syn_data = { .map = map };
1316	struct perf_record_cpu_map *event;
 
 
1317
1318
1319	event = cpu_map_data__alloc(&syn_data, sizeof(struct perf_event_header));
1320	if (!event)
1321		return NULL;
1322
1323	syn_data.data = &event->data;
1324	event->header.type = PERF_RECORD_CPU_MAP;
1325	event->header.size = syn_data.size;
1326	cpu_map_data__synthesize(&syn_data);
 
 
1327	return event;
1328}
1329
1330
1331int perf_event__synthesize_cpu_map(struct perf_tool *tool,
1332				   const struct perf_cpu_map *map,
1333				   perf_event__handler_t process,
1334				   struct machine *machine)
1335{
1336	struct perf_record_cpu_map *event;
1337	int err;
1338
1339	event = cpu_map_event__new(map);
1340	if (!event)
1341		return -ENOMEM;
1342
1343	err = process(tool, (union perf_event *) event, NULL, machine);
1344
1345	free(event);
1346	return err;
1347}
1348
1349int perf_event__synthesize_stat_config(struct perf_tool *tool,
1350				       struct perf_stat_config *config,
1351				       perf_event__handler_t process,
1352				       struct machine *machine)
1353{
1354	struct perf_record_stat_config *event;
1355	int size, i = 0, err;
1356
1357	size  = sizeof(*event);
1358	size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0]));
1359
1360	event = zalloc(size);
1361	if (!event)
1362		return -ENOMEM;
1363
1364	event->header.type = PERF_RECORD_STAT_CONFIG;
1365	event->header.size = size;
1366	event->nr          = PERF_STAT_CONFIG_TERM__MAX;
1367
1368#define ADD(__term, __val)					\
1369	event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term;	\
1370	event->data[i].val = __val;				\
1371	i++;
1372
1373	ADD(AGGR_MODE,	config->aggr_mode)
1374	ADD(INTERVAL,	config->interval)
1375	ADD(SCALE,	config->scale)
1376
1377	WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX,
1378		  "stat config terms unbalanced\n");
1379#undef ADD
1380
1381	err = process(tool, (union perf_event *) event, NULL, machine);
1382
1383	free(event);
1384	return err;
1385}
1386
1387int perf_event__synthesize_stat(struct perf_tool *tool,
1388				struct perf_cpu cpu, u32 thread, u64 id,
1389				struct perf_counts_values *count,
1390				perf_event__handler_t process,
1391				struct machine *machine)
1392{
1393	struct perf_record_stat event;
1394
1395	event.header.type = PERF_RECORD_STAT;
1396	event.header.size = sizeof(event);
1397	event.header.misc = 0;
1398
1399	event.id        = id;
1400	event.cpu       = cpu.cpu;
1401	event.thread    = thread;
1402	event.val       = count->val;
1403	event.ena       = count->ena;
1404	event.run       = count->run;
1405
1406	return process(tool, (union perf_event *) &event, NULL, machine);
1407}
1408
1409int perf_event__synthesize_stat_round(struct perf_tool *tool,
1410				      u64 evtime, u64 type,
1411				      perf_event__handler_t process,
1412				      struct machine *machine)
1413{
1414	struct perf_record_stat_round event;
1415
1416	event.header.type = PERF_RECORD_STAT_ROUND;
1417	event.header.size = sizeof(event);
1418	event.header.misc = 0;
1419
1420	event.time = evtime;
1421	event.type = type;
1422
1423	return process(tool, (union perf_event *) &event, NULL, machine);
1424}
1425
1426size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type, u64 read_format)
1427{
1428	size_t sz, result = sizeof(struct perf_record_sample);
1429
1430	if (type & PERF_SAMPLE_IDENTIFIER)
1431		result += sizeof(u64);
1432
1433	if (type & PERF_SAMPLE_IP)
1434		result += sizeof(u64);
1435
1436	if (type & PERF_SAMPLE_TID)
1437		result += sizeof(u64);
1438
1439	if (type & PERF_SAMPLE_TIME)
1440		result += sizeof(u64);
1441
1442	if (type & PERF_SAMPLE_ADDR)
1443		result += sizeof(u64);
1444
1445	if (type & PERF_SAMPLE_ID)
1446		result += sizeof(u64);
1447
1448	if (type & PERF_SAMPLE_STREAM_ID)
1449		result += sizeof(u64);
1450
1451	if (type & PERF_SAMPLE_CPU)
1452		result += sizeof(u64);
1453
1454	if (type & PERF_SAMPLE_PERIOD)
1455		result += sizeof(u64);
1456
1457	if (type & PERF_SAMPLE_READ) {
1458		result += sizeof(u64);
1459		if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1460			result += sizeof(u64);
1461		if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1462			result += sizeof(u64);
1463		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1464		if (read_format & PERF_FORMAT_GROUP) {
1465			sz = sample_read_value_size(read_format);
1466			result += sz * sample->read.group.nr;
 
1467		} else {
1468			result += sizeof(u64);
1469			if (read_format & PERF_FORMAT_LOST)
1470				result += sizeof(u64);
1471		}
1472	}
1473
1474	if (type & PERF_SAMPLE_CALLCHAIN) {
1475		sz = (sample->callchain->nr + 1) * sizeof(u64);
1476		result += sz;
1477	}
1478
1479	if (type & PERF_SAMPLE_RAW) {
1480		result += sizeof(u32);
1481		result += sample->raw_size;
1482	}
1483
1484	if (type & PERF_SAMPLE_BRANCH_STACK) {
1485		sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1486		/* nr, hw_idx */
1487		sz += 2 * sizeof(u64);
1488		result += sz;
1489	}
1490
1491	if (type & PERF_SAMPLE_REGS_USER) {
1492		if (sample->user_regs.abi) {
1493			result += sizeof(u64);
1494			sz = hweight64(sample->user_regs.mask) * sizeof(u64);
1495			result += sz;
1496		} else {
1497			result += sizeof(u64);
1498		}
1499	}
1500
1501	if (type & PERF_SAMPLE_STACK_USER) {
1502		sz = sample->user_stack.size;
1503		result += sizeof(u64);
1504		if (sz) {
1505			result += sz;
1506			result += sizeof(u64);
1507		}
1508	}
1509
1510	if (type & PERF_SAMPLE_WEIGHT_TYPE)
1511		result += sizeof(u64);
1512
1513	if (type & PERF_SAMPLE_DATA_SRC)
1514		result += sizeof(u64);
1515
1516	if (type & PERF_SAMPLE_TRANSACTION)
1517		result += sizeof(u64);
1518
1519	if (type & PERF_SAMPLE_REGS_INTR) {
1520		if (sample->intr_regs.abi) {
1521			result += sizeof(u64);
1522			sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
1523			result += sz;
1524		} else {
1525			result += sizeof(u64);
1526		}
1527	}
1528
1529	if (type & PERF_SAMPLE_PHYS_ADDR)
1530		result += sizeof(u64);
1531
1532	if (type & PERF_SAMPLE_CGROUP)
1533		result += sizeof(u64);
1534
1535	if (type & PERF_SAMPLE_DATA_PAGE_SIZE)
1536		result += sizeof(u64);
1537
1538	if (type & PERF_SAMPLE_CODE_PAGE_SIZE)
1539		result += sizeof(u64);
1540
1541	if (type & PERF_SAMPLE_AUX) {
1542		result += sizeof(u64);
1543		result += sample->aux_sample.size;
1544	}
1545
1546	return result;
1547}
1548
1549void __weak arch_perf_synthesize_sample_weight(const struct perf_sample *data,
1550					       __u64 *array, u64 type __maybe_unused)
1551{
1552	*array = data->weight;
1553}
1554
1555static __u64 *copy_read_group_values(__u64 *array, __u64 read_format,
1556				     const struct perf_sample *sample)
1557{
1558	size_t sz = sample_read_value_size(read_format);
1559	struct sample_read_value *v = sample->read.group.values;
1560
1561	sample_read_group__for_each(v, sample->read.group.nr, read_format) {
1562		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1563		memcpy(array, v, sz);
1564		array = (void *)array + sz;
1565	}
1566	return array;
1567}
1568
1569int perf_event__synthesize_sample(union perf_event *event, u64 type, u64 read_format,
1570				  const struct perf_sample *sample)
1571{
1572	__u64 *array;
1573	size_t sz;
1574	/*
1575	 * used for cross-endian analysis. See git commit 65014ab3
1576	 * for why this goofiness is needed.
1577	 */
1578	union u64_swap u;
1579
1580	array = event->sample.array;
1581
1582	if (type & PERF_SAMPLE_IDENTIFIER) {
1583		*array = sample->id;
1584		array++;
1585	}
1586
1587	if (type & PERF_SAMPLE_IP) {
1588		*array = sample->ip;
1589		array++;
1590	}
1591
1592	if (type & PERF_SAMPLE_TID) {
1593		u.val32[0] = sample->pid;
1594		u.val32[1] = sample->tid;
1595		*array = u.val64;
1596		array++;
1597	}
1598
1599	if (type & PERF_SAMPLE_TIME) {
1600		*array = sample->time;
1601		array++;
1602	}
1603
1604	if (type & PERF_SAMPLE_ADDR) {
1605		*array = sample->addr;
1606		array++;
1607	}
1608
1609	if (type & PERF_SAMPLE_ID) {
1610		*array = sample->id;
1611		array++;
1612	}
1613
1614	if (type & PERF_SAMPLE_STREAM_ID) {
1615		*array = sample->stream_id;
1616		array++;
1617	}
1618
1619	if (type & PERF_SAMPLE_CPU) {
1620		u.val32[0] = sample->cpu;
1621		u.val32[1] = 0;
1622		*array = u.val64;
1623		array++;
1624	}
1625
1626	if (type & PERF_SAMPLE_PERIOD) {
1627		*array = sample->period;
1628		array++;
1629	}
1630
1631	if (type & PERF_SAMPLE_READ) {
1632		if (read_format & PERF_FORMAT_GROUP)
1633			*array = sample->read.group.nr;
1634		else
1635			*array = sample->read.one.value;
1636		array++;
1637
1638		if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1639			*array = sample->read.time_enabled;
1640			array++;
1641		}
1642
1643		if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1644			*array = sample->read.time_running;
1645			array++;
1646		}
1647
1648		/* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1649		if (read_format & PERF_FORMAT_GROUP) {
1650			array = copy_read_group_values(array, read_format,
1651						       sample);
 
 
1652		} else {
1653			*array = sample->read.one.id;
1654			array++;
1655
1656			if (read_format & PERF_FORMAT_LOST) {
1657				*array = sample->read.one.lost;
1658				array++;
1659			}
1660		}
1661	}
1662
1663	if (type & PERF_SAMPLE_CALLCHAIN) {
1664		sz = (sample->callchain->nr + 1) * sizeof(u64);
1665		memcpy(array, sample->callchain, sz);
1666		array = (void *)array + sz;
1667	}
1668
1669	if (type & PERF_SAMPLE_RAW) {
1670		u.val32[0] = sample->raw_size;
1671		*array = u.val64;
1672		array = (void *)array + sizeof(u32);
1673
1674		memcpy(array, sample->raw_data, sample->raw_size);
1675		array = (void *)array + sample->raw_size;
1676	}
1677
1678	if (type & PERF_SAMPLE_BRANCH_STACK) {
1679		sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1680		/* nr, hw_idx */
1681		sz += 2 * sizeof(u64);
1682		memcpy(array, sample->branch_stack, sz);
1683		array = (void *)array + sz;
1684	}
1685
1686	if (type & PERF_SAMPLE_REGS_USER) {
1687		if (sample->user_regs.abi) {
1688			*array++ = sample->user_regs.abi;
1689			sz = hweight64(sample->user_regs.mask) * sizeof(u64);
1690			memcpy(array, sample->user_regs.regs, sz);
1691			array = (void *)array + sz;
1692		} else {
1693			*array++ = 0;
1694		}
1695	}
1696
1697	if (type & PERF_SAMPLE_STACK_USER) {
1698		sz = sample->user_stack.size;
1699		*array++ = sz;
1700		if (sz) {
1701			memcpy(array, sample->user_stack.data, sz);
1702			array = (void *)array + sz;
1703			*array++ = sz;
1704		}
1705	}
1706
1707	if (type & PERF_SAMPLE_WEIGHT_TYPE) {
1708		arch_perf_synthesize_sample_weight(sample, array, type);
1709		array++;
1710	}
1711
1712	if (type & PERF_SAMPLE_DATA_SRC) {
1713		*array = sample->data_src;
1714		array++;
1715	}
1716
1717	if (type & PERF_SAMPLE_TRANSACTION) {
1718		*array = sample->transaction;
1719		array++;
1720	}
1721
1722	if (type & PERF_SAMPLE_REGS_INTR) {
1723		if (sample->intr_regs.abi) {
1724			*array++ = sample->intr_regs.abi;
1725			sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
1726			memcpy(array, sample->intr_regs.regs, sz);
1727			array = (void *)array + sz;
1728		} else {
1729			*array++ = 0;
1730		}
1731	}
1732
1733	if (type & PERF_SAMPLE_PHYS_ADDR) {
1734		*array = sample->phys_addr;
1735		array++;
1736	}
1737
1738	if (type & PERF_SAMPLE_CGROUP) {
1739		*array = sample->cgroup;
1740		array++;
1741	}
1742
1743	if (type & PERF_SAMPLE_DATA_PAGE_SIZE) {
1744		*array = sample->data_page_size;
1745		array++;
1746	}
1747
1748	if (type & PERF_SAMPLE_CODE_PAGE_SIZE) {
1749		*array = sample->code_page_size;
1750		array++;
1751	}
1752
1753	if (type & PERF_SAMPLE_AUX) {
1754		sz = sample->aux_sample.size;
1755		*array++ = sz;
1756		memcpy(array, sample->aux_sample.data, sz);
1757		array = (void *)array + sz;
1758	}
1759
1760	return 0;
1761}
1762
1763int perf_event__synthesize_id_sample(__u64 *array, u64 type, const struct perf_sample *sample)
1764{
1765	__u64 *start = array;
1766
1767	/*
1768	 * used for cross-endian analysis. See git commit 65014ab3
1769	 * for why this goofiness is needed.
1770	 */
1771	union u64_swap u;
1772
1773	if (type & PERF_SAMPLE_TID) {
1774		u.val32[0] = sample->pid;
1775		u.val32[1] = sample->tid;
1776		*array = u.val64;
1777		array++;
1778	}
1779
1780	if (type & PERF_SAMPLE_TIME) {
1781		*array = sample->time;
1782		array++;
1783	}
1784
1785	if (type & PERF_SAMPLE_ID) {
1786		*array = sample->id;
1787		array++;
1788	}
1789
1790	if (type & PERF_SAMPLE_STREAM_ID) {
1791		*array = sample->stream_id;
1792		array++;
1793	}
1794
1795	if (type & PERF_SAMPLE_CPU) {
1796		u.val32[0] = sample->cpu;
1797		u.val32[1] = 0;
1798		*array = u.val64;
1799		array++;
1800	}
1801
1802	if (type & PERF_SAMPLE_IDENTIFIER) {
1803		*array = sample->id;
1804		array++;
1805	}
1806
1807	return (void *)array - (void *)start;
1808}
1809
1810int __perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process,
1811				      struct evlist *evlist, struct machine *machine, size_t from)
1812{
1813	union perf_event *ev;
1814	struct evsel *evsel;
1815	size_t nr = 0, i = 0, sz, max_nr, n, pos;
1816	size_t e1_sz = sizeof(struct id_index_entry);
1817	size_t e2_sz = sizeof(struct id_index_entry_2);
1818	size_t etot_sz = e1_sz + e2_sz;
1819	bool e2_needed = false;
1820	int err;
1821
1822	max_nr = (UINT16_MAX - sizeof(struct perf_record_id_index)) / etot_sz;
1823
1824	pos = 0;
1825	evlist__for_each_entry(evlist, evsel) {
1826		if (pos++ < from)
1827			continue;
1828		nr += evsel->core.ids;
1829	}
1830
1831	if (!nr)
1832		return 0;
1833
1834	pr_debug2("Synthesizing id index\n");
1835
1836	n = nr > max_nr ? max_nr : nr;
1837	sz = sizeof(struct perf_record_id_index) + n * etot_sz;
1838	ev = zalloc(sz);
1839	if (!ev)
1840		return -ENOMEM;
1841
1842	sz = sizeof(struct perf_record_id_index) + n * e1_sz;
1843
1844	ev->id_index.header.type = PERF_RECORD_ID_INDEX;
 
1845	ev->id_index.nr = n;
1846
1847	pos = 0;
1848	evlist__for_each_entry(evlist, evsel) {
1849		u32 j;
1850
1851		if (pos++ < from)
1852			continue;
1853		for (j = 0; j < evsel->core.ids; j++, i++) {
1854			struct id_index_entry *e;
1855			struct id_index_entry_2 *e2;
1856			struct perf_sample_id *sid;
1857
1858			if (i >= n) {
1859				ev->id_index.header.size = sz + (e2_needed ? n * e2_sz : 0);
1860				err = process(tool, ev, NULL, machine);
1861				if (err)
1862					goto out_err;
1863				nr -= n;
1864				i = 0;
1865				e2_needed = false;
1866			}
1867
1868			e = &ev->id_index.entries[i];
1869
1870			e->id = evsel->core.id[j];
1871
1872			sid = evlist__id2sid(evlist, e->id);
1873			if (!sid) {
1874				free(ev);
1875				return -ENOENT;
1876			}
1877
1878			e->idx = sid->idx;
1879			e->cpu = sid->cpu.cpu;
1880			e->tid = sid->tid;
1881
1882			if (sid->machine_pid)
1883				e2_needed = true;
1884
1885			e2 = (void *)ev + sz;
1886			e2[i].machine_pid = sid->machine_pid;
1887			e2[i].vcpu        = sid->vcpu.cpu;
1888		}
1889	}
1890
1891	sz = sizeof(struct perf_record_id_index) + nr * e1_sz;
1892	ev->id_index.header.size = sz + (e2_needed ? nr * e2_sz : 0);
1893	ev->id_index.nr = nr;
1894
1895	err = process(tool, ev, NULL, machine);
1896out_err:
1897	free(ev);
1898
1899	return err;
1900}
1901
1902int perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process,
1903				    struct evlist *evlist, struct machine *machine)
1904{
1905	return __perf_event__synthesize_id_index(tool, process, evlist, machine, 0);
1906}
1907
1908int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
1909				  struct target *target, struct perf_thread_map *threads,
1910				  perf_event__handler_t process, bool needs_mmap,
1911				  bool data_mmap, unsigned int nr_threads_synthesize)
1912{
1913	/*
1914	 * When perf runs in non-root PID namespace, and the namespace's proc FS
1915	 * is not mounted, nsinfo__is_in_root_namespace() returns false.
1916	 * In this case, the proc FS is coming for the parent namespace, thus
1917	 * perf tool will wrongly gather process info from its parent PID
1918	 * namespace.
1919	 *
1920	 * To avoid the confusion that the perf tool runs in a child PID
1921	 * namespace but it synthesizes thread info from its parent PID
1922	 * namespace, returns failure with warning.
1923	 */
1924	if (!nsinfo__is_in_root_namespace()) {
1925		pr_err("Perf runs in non-root PID namespace but it tries to ");
1926		pr_err("gather process info from its parent PID namespace.\n");
1927		pr_err("Please mount the proc file system properly, e.g. ");
1928		pr_err("add the option '--mount-proc' for unshare command.\n");
1929		return -EPERM;
1930	}
1931
1932	if (target__has_task(target))
1933		return perf_event__synthesize_thread_map(tool, threads, process, machine,
1934							 needs_mmap, data_mmap);
1935	else if (target__has_cpu(target))
1936		return perf_event__synthesize_threads(tool, process, machine,
1937						      needs_mmap, data_mmap,
1938						      nr_threads_synthesize);
1939	/* command specified */
1940	return 0;
1941}
1942
1943int machine__synthesize_threads(struct machine *machine, struct target *target,
1944				struct perf_thread_map *threads, bool needs_mmap,
1945				bool data_mmap, unsigned int nr_threads_synthesize)
1946{
1947	return __machine__synthesize_threads(machine, NULL, target, threads,
1948					     perf_event__process, needs_mmap,
1949					     data_mmap, nr_threads_synthesize);
1950}
1951
1952static struct perf_record_event_update *event_update_event__new(size_t size, u64 type, u64 id)
1953{
1954	struct perf_record_event_update *ev;
1955
1956	size += sizeof(*ev);
1957	size  = PERF_ALIGN(size, sizeof(u64));
1958
1959	ev = zalloc(size);
1960	if (ev) {
1961		ev->header.type = PERF_RECORD_EVENT_UPDATE;
1962		ev->header.size = (u16)size;
1963		ev->type	= type;
1964		ev->id		= id;
1965	}
1966	return ev;
1967}
1968
1969int perf_event__synthesize_event_update_unit(struct perf_tool *tool, struct evsel *evsel,
1970					     perf_event__handler_t process)
1971{
1972	size_t size = strlen(evsel->unit);
1973	struct perf_record_event_update *ev;
1974	int err;
1975
1976	ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->core.id[0]);
1977	if (ev == NULL)
1978		return -ENOMEM;
1979
1980	strlcpy(ev->unit, evsel->unit, size + 1);
1981	err = process(tool, (union perf_event *)ev, NULL, NULL);
1982	free(ev);
1983	return err;
1984}
1985
1986int perf_event__synthesize_event_update_scale(struct perf_tool *tool, struct evsel *evsel,
1987					      perf_event__handler_t process)
1988{
1989	struct perf_record_event_update *ev;
1990	struct perf_record_event_update_scale *ev_data;
1991	int err;
1992
1993	ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->core.id[0]);
1994	if (ev == NULL)
1995		return -ENOMEM;
1996
1997	ev->scale.scale = evsel->scale;
 
1998	err = process(tool, (union perf_event *)ev, NULL, NULL);
1999	free(ev);
2000	return err;
2001}
2002
2003int perf_event__synthesize_event_update_name(struct perf_tool *tool, struct evsel *evsel,
2004					     perf_event__handler_t process)
2005{
2006	struct perf_record_event_update *ev;
2007	size_t len = strlen(evsel->name);
2008	int err;
2009
2010	ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->core.id[0]);
2011	if (ev == NULL)
2012		return -ENOMEM;
2013
2014	strlcpy(ev->name, evsel->name, len + 1);
2015	err = process(tool, (union perf_event *)ev, NULL, NULL);
2016	free(ev);
2017	return err;
2018}
2019
2020int perf_event__synthesize_event_update_cpus(struct perf_tool *tool, struct evsel *evsel,
2021					     perf_event__handler_t process)
2022{
2023	struct synthesize_cpu_map_data syn_data = { .map = evsel->core.own_cpus };
2024	struct perf_record_event_update *ev;
2025	int err;
 
2026
2027	ev = cpu_map_data__alloc(&syn_data, sizeof(struct perf_event_header) + 2 * sizeof(u64));
 
 
 
2028	if (!ev)
2029		return -ENOMEM;
2030
2031	syn_data.data = &ev->cpus.cpus;
2032	ev->header.type = PERF_RECORD_EVENT_UPDATE;
2033	ev->header.size = (u16)syn_data.size;
2034	ev->type	= PERF_EVENT_UPDATE__CPUS;
2035	ev->id		= evsel->core.id[0];
2036	cpu_map_data__synthesize(&syn_data);
 
 
2037
2038	err = process(tool, (union perf_event *)ev, NULL, NULL);
2039	free(ev);
2040	return err;
2041}
2042
2043int perf_event__synthesize_attrs(struct perf_tool *tool, struct evlist *evlist,
2044				 perf_event__handler_t process)
2045{
2046	struct evsel *evsel;
2047	int err = 0;
2048
2049	evlist__for_each_entry(evlist, evsel) {
2050		err = perf_event__synthesize_attr(tool, &evsel->core.attr, evsel->core.ids,
2051						  evsel->core.id, process);
2052		if (err) {
2053			pr_debug("failed to create perf header attribute\n");
2054			return err;
2055		}
2056	}
2057
2058	return err;
2059}
2060
2061static bool has_unit(struct evsel *evsel)
2062{
2063	return evsel->unit && *evsel->unit;
2064}
2065
2066static bool has_scale(struct evsel *evsel)
2067{
2068	return evsel->scale != 1;
2069}
2070
2071int perf_event__synthesize_extra_attr(struct perf_tool *tool, struct evlist *evsel_list,
2072				      perf_event__handler_t process, bool is_pipe)
2073{
2074	struct evsel *evsel;
2075	int err;
2076
2077	/*
2078	 * Synthesize other events stuff not carried within
2079	 * attr event - unit, scale, name
2080	 */
2081	evlist__for_each_entry(evsel_list, evsel) {
2082		if (!evsel->supported)
2083			continue;
2084
2085		/*
2086		 * Synthesize unit and scale only if it's defined.
2087		 */
2088		if (has_unit(evsel)) {
2089			err = perf_event__synthesize_event_update_unit(tool, evsel, process);
2090			if (err < 0) {
2091				pr_err("Couldn't synthesize evsel unit.\n");
2092				return err;
2093			}
2094		}
2095
2096		if (has_scale(evsel)) {
2097			err = perf_event__synthesize_event_update_scale(tool, evsel, process);
2098			if (err < 0) {
2099				pr_err("Couldn't synthesize evsel evsel.\n");
2100				return err;
2101			}
2102		}
2103
2104		if (evsel->core.own_cpus) {
2105			err = perf_event__synthesize_event_update_cpus(tool, evsel, process);
2106			if (err < 0) {
2107				pr_err("Couldn't synthesize evsel cpus.\n");
2108				return err;
2109			}
2110		}
2111
2112		/*
2113		 * Name is needed only for pipe output,
2114		 * perf.data carries event names.
2115		 */
2116		if (is_pipe) {
2117			err = perf_event__synthesize_event_update_name(tool, evsel, process);
2118			if (err < 0) {
2119				pr_err("Couldn't synthesize evsel name.\n");
2120				return err;
2121			}
2122		}
2123	}
2124	return 0;
2125}
2126
2127int perf_event__synthesize_attr(struct perf_tool *tool, struct perf_event_attr *attr,
2128				u32 ids, u64 *id, perf_event__handler_t process)
2129{
2130	union perf_event *ev;
2131	size_t size;
2132	int err;
2133
2134	size = sizeof(struct perf_event_attr);
2135	size = PERF_ALIGN(size, sizeof(u64));
2136	size += sizeof(struct perf_event_header);
2137	size += ids * sizeof(u64);
2138
2139	ev = zalloc(size);
2140
2141	if (ev == NULL)
2142		return -ENOMEM;
2143
2144	ev->attr.attr = *attr;
2145	memcpy(ev->attr.id, id, ids * sizeof(u64));
2146
2147	ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
2148	ev->attr.header.size = (u16)size;
2149
2150	if (ev->attr.header.size == size)
2151		err = process(tool, ev, NULL, NULL);
2152	else
2153		err = -E2BIG;
2154
2155	free(ev);
2156
2157	return err;
2158}
2159
2160#ifdef HAVE_LIBTRACEEVENT
2161int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd, struct evlist *evlist,
2162					perf_event__handler_t process)
2163{
2164	union perf_event ev;
2165	struct tracing_data *tdata;
2166	ssize_t size = 0, aligned_size = 0, padding;
2167	struct feat_fd ff;
2168
2169	/*
2170	 * We are going to store the size of the data followed
2171	 * by the data contents. Since the fd descriptor is a pipe,
2172	 * we cannot seek back to store the size of the data once
2173	 * we know it. Instead we:
2174	 *
2175	 * - write the tracing data to the temp file
2176	 * - get/write the data size to pipe
2177	 * - write the tracing data from the temp file
2178	 *   to the pipe
2179	 */
2180	tdata = tracing_data_get(&evlist->core.entries, fd, true);
2181	if (!tdata)
2182		return -1;
2183
2184	memset(&ev, 0, sizeof(ev));
2185
2186	ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
2187	size = tdata->size;
2188	aligned_size = PERF_ALIGN(size, sizeof(u64));
2189	padding = aligned_size - size;
2190	ev.tracing_data.header.size = sizeof(ev.tracing_data);
2191	ev.tracing_data.size = aligned_size;
2192
2193	process(tool, &ev, NULL, NULL);
2194
2195	/*
2196	 * The put function will copy all the tracing data
2197	 * stored in temp file to the pipe.
2198	 */
2199	tracing_data_put(tdata);
2200
2201	ff = (struct feat_fd){ .fd = fd };
2202	if (write_padded(&ff, NULL, 0, padding))
2203		return -1;
2204
2205	return aligned_size;
2206}
2207#endif
2208
2209int perf_event__synthesize_build_id(struct perf_tool *tool, struct dso *pos, u16 misc,
2210				    perf_event__handler_t process, struct machine *machine)
2211{
2212	union perf_event ev;
2213	size_t len;
2214
2215	if (!pos->hit)
2216		return 0;
2217
2218	memset(&ev, 0, sizeof(ev));
2219
2220	len = pos->long_name_len + 1;
2221	len = PERF_ALIGN(len, NAME_ALIGN);
2222	memcpy(&ev.build_id.build_id, pos->bid.data, sizeof(pos->bid.data));
2223	ev.build_id.size = pos->bid.size;
2224	ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
2225	ev.build_id.header.misc = misc | PERF_RECORD_MISC_BUILD_ID_SIZE;
2226	ev.build_id.pid = machine->pid;
2227	ev.build_id.header.size = sizeof(ev.build_id) + len;
2228	memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
2229
2230	return process(tool, &ev, NULL, machine);
2231}
2232
2233int perf_event__synthesize_stat_events(struct perf_stat_config *config, struct perf_tool *tool,
2234				       struct evlist *evlist, perf_event__handler_t process, bool attrs)
2235{
2236	int err;
2237
2238	if (attrs) {
2239		err = perf_event__synthesize_attrs(tool, evlist, process);
2240		if (err < 0) {
2241			pr_err("Couldn't synthesize attrs.\n");
2242			return err;
2243		}
2244	}
2245
2246	err = perf_event__synthesize_extra_attr(tool, evlist, process, attrs);
2247	err = perf_event__synthesize_thread_map2(tool, evlist->core.threads, process, NULL);
2248	if (err < 0) {
2249		pr_err("Couldn't synthesize thread map.\n");
2250		return err;
2251	}
2252
2253	err = perf_event__synthesize_cpu_map(tool, evlist->core.user_requested_cpus, process, NULL);
2254	if (err < 0) {
2255		pr_err("Couldn't synthesize thread map.\n");
2256		return err;
2257	}
2258
2259	err = perf_event__synthesize_stat_config(tool, config, process, NULL);
2260	if (err < 0) {
2261		pr_err("Couldn't synthesize config.\n");
2262		return err;
2263	}
2264
2265	return 0;
2266}
2267
 
 
 
 
 
 
 
 
2268extern const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE];
2269
2270int perf_event__synthesize_features(struct perf_tool *tool, struct perf_session *session,
2271				    struct evlist *evlist, perf_event__handler_t process)
2272{
2273	struct perf_header *header = &session->header;
2274	struct perf_record_header_feature *fe;
2275	struct feat_fd ff;
2276	size_t sz, sz_hdr;
2277	int feat, ret;
2278
2279	sz_hdr = sizeof(fe->header);
2280	sz = sizeof(union perf_event);
2281	/* get a nice alignment */
2282	sz = PERF_ALIGN(sz, page_size);
2283
2284	memset(&ff, 0, sizeof(ff));
2285
2286	ff.buf = malloc(sz);
2287	if (!ff.buf)
2288		return -ENOMEM;
2289
2290	ff.size = sz - sz_hdr;
2291	ff.ph = &session->header;
2292
2293	for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
2294		if (!feat_ops[feat].synthesize) {
2295			pr_debug("No record header feature for header :%d\n", feat);
2296			continue;
2297		}
2298
2299		ff.offset = sizeof(*fe);
2300
2301		ret = feat_ops[feat].write(&ff, evlist);
2302		if (ret || ff.offset <= (ssize_t)sizeof(*fe)) {
2303			pr_debug("Error writing feature\n");
2304			continue;
2305		}
2306		/* ff.buf may have changed due to realloc in do_write() */
2307		fe = ff.buf;
2308		memset(fe, 0, sizeof(*fe));
2309
2310		fe->feat_id = feat;
2311		fe->header.type = PERF_RECORD_HEADER_FEATURE;
2312		fe->header.size = ff.offset;
2313
2314		ret = process(tool, ff.buf, NULL, NULL);
2315		if (ret) {
2316			free(ff.buf);
2317			return ret;
2318		}
2319	}
2320
2321	/* Send HEADER_LAST_FEATURE mark. */
2322	fe = ff.buf;
2323	fe->feat_id     = HEADER_LAST_FEATURE;
2324	fe->header.type = PERF_RECORD_HEADER_FEATURE;
2325	fe->header.size = sizeof(*fe);
2326
2327	ret = process(tool, ff.buf, NULL, NULL);
2328
2329	free(ff.buf);
2330	return ret;
2331}
2332
2333int perf_event__synthesize_for_pipe(struct perf_tool *tool,
2334				    struct perf_session *session,
2335				    struct perf_data *data,
2336				    perf_event__handler_t process)
2337{
2338	int err;
2339	int ret = 0;
2340	struct evlist *evlist = session->evlist;
2341
2342	/*
2343	 * We need to synthesize events first, because some
2344	 * features works on top of them (on report side).
2345	 */
2346	err = perf_event__synthesize_attrs(tool, evlist, process);
2347	if (err < 0) {
2348		pr_err("Couldn't synthesize attrs.\n");
2349		return err;
2350	}
2351	ret += err;
2352
2353	err = perf_event__synthesize_features(tool, session, evlist, process);
2354	if (err < 0) {
2355		pr_err("Couldn't synthesize features.\n");
2356		return err;
2357	}
2358	ret += err;
2359
2360#ifdef HAVE_LIBTRACEEVENT
2361	if (have_tracepoints(&evlist->core.entries)) {
2362		int fd = perf_data__fd(data);
2363
2364		/*
2365		 * FIXME err <= 0 here actually means that
2366		 * there were no tracepoints so its not really
2367		 * an error, just that we don't need to
2368		 * synthesize anything.  We really have to
2369		 * return this more properly and also
2370		 * propagate errors that now are calling die()
2371		 */
2372		err = perf_event__synthesize_tracing_data(tool,	fd, evlist,
2373							  process);
2374		if (err <= 0) {
2375			pr_err("Couldn't record tracing data.\n");
2376			return err;
2377		}
2378		ret += err;
2379	}
2380#else
2381	(void)data;
2382#endif
2383
2384	return ret;
2385}
2386
2387int parse_synth_opt(char *synth)
2388{
2389	char *p, *q;
2390	int ret = 0;
2391
2392	if (synth == NULL)
2393		return -1;
2394
2395	for (q = synth; (p = strsep(&q, ",")); p = q) {
2396		if (!strcasecmp(p, "no") || !strcasecmp(p, "none"))
2397			return 0;
2398
2399		if (!strcasecmp(p, "all"))
2400			return PERF_SYNTH_ALL;
2401
2402		if (!strcasecmp(p, "task"))
2403			ret |= PERF_SYNTH_TASK;
2404		else if (!strcasecmp(p, "mmap"))
2405			ret |= PERF_SYNTH_TASK | PERF_SYNTH_MMAP;
2406		else if (!strcasecmp(p, "cgroup"))
2407			ret |= PERF_SYNTH_CGROUP;
2408		else
2409			return -1;
2410	}
2411
2412	return ret;
2413}