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0001 // SPDX-License-Identifier: GPL-2.0-only 
0002 
0003 #include "util/cgroup.h"
0004 #include "util/data.h"
0005 #include "util/debug.h"
0006 #include "util/dso.h"
0007 #include "util/event.h"
0008 #include "util/evlist.h"
0009 #include "util/machine.h"
0010 #include "util/map.h"
0011 #include "util/map_symbol.h"
0012 #include "util/branch.h"
0013 #include "util/memswap.h"
0014 #include "util/namespaces.h"
0015 #include "util/session.h"
0016 #include "util/stat.h"
0017 #include "util/symbol.h"
0018 #include "util/synthetic-events.h"
0019 #include "util/target.h"
0020 #include "util/time-utils.h"
0021 #include <linux/bitops.h>
0022 #include <linux/kernel.h>
0023 #include <linux/string.h>
0024 #include <linux/zalloc.h>
0025 #include <linux/perf_event.h>
0026 #include <asm/bug.h>
0027 #include <perf/evsel.h>
0028 #include <perf/cpumap.h>
0029 #include <internal/lib.h> // page_size
0030 #include <internal/threadmap.h>
0031 #include <perf/threadmap.h>
0032 #include <symbol/kallsyms.h>
0033 #include <dirent.h>
0034 #include <errno.h>
0035 #include <inttypes.h>
0036 #include <stdio.h>
0037 #include <string.h>
0038 #include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */
0039 #include <api/fs/fs.h>
0040 #include <api/io.h>
0041 #include <sys/types.h>
0042 #include <sys/stat.h>
0043 #include <fcntl.h>
0044 #include <unistd.h>
0045 
0046 #define DEFAULT_PROC_MAP_PARSE_TIMEOUT 500
0047 
0048 unsigned int proc_map_timeout = DEFAULT_PROC_MAP_PARSE_TIMEOUT;
0049 
0050 int perf_tool__process_synth_event(struct perf_tool *tool,
0051                    union perf_event *event,
0052                    struct machine *machine,
0053                    perf_event__handler_t process)
0054 {
0055     struct perf_sample synth_sample = {
0056         .pid       = -1,
0057         .tid       = -1,
0058         .time      = -1,
0059         .stream_id = -1,
0060         .cpu       = -1,
0061         .period    = 1,
0062         .cpumode   = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK,
0063     };
0064 
0065     return process(tool, event, &synth_sample, machine);
0066 };
0067 
0068 /*
0069  * Assumes that the first 4095 bytes of /proc/pid/stat contains
0070  * the comm, tgid and ppid.
0071  */
0072 static int perf_event__get_comm_ids(pid_t pid, pid_t tid, char *comm, size_t len,
0073                     pid_t *tgid, pid_t *ppid, bool *kernel)
0074 {
0075     char bf[4096];
0076     int fd;
0077     size_t size = 0;
0078     ssize_t n;
0079     char *name, *tgids, *ppids, *vmpeak, *threads;
0080 
0081     *tgid = -1;
0082     *ppid = -1;
0083 
0084     if (pid)
0085         snprintf(bf, sizeof(bf), "/proc/%d/task/%d/status", pid, tid);
0086     else
0087         snprintf(bf, sizeof(bf), "/proc/%d/status", tid);
0088 
0089     fd = open(bf, O_RDONLY);
0090     if (fd < 0) {
0091         pr_debug("couldn't open %s\n", bf);
0092         return -1;
0093     }
0094 
0095     n = read(fd, bf, sizeof(bf) - 1);
0096     close(fd);
0097     if (n <= 0) {
0098         pr_warning("Couldn't get COMM, tigd and ppid for pid %d\n",
0099                tid);
0100         return -1;
0101     }
0102     bf[n] = '\0';
0103 
0104     name = strstr(bf, "Name:");
0105     tgids = strstr(name ?: bf, "Tgid:");
0106     ppids = strstr(tgids ?: bf, "PPid:");
0107     vmpeak = strstr(ppids ?: bf, "VmPeak:");
0108 
0109     if (vmpeak)
0110         threads = NULL;
0111     else
0112         threads = strstr(ppids ?: bf, "Threads:");
0113 
0114     if (name) {
0115         char *nl;
0116 
0117         name = skip_spaces(name + 5);  /* strlen("Name:") */
0118         nl = strchr(name, '\n');
0119         if (nl)
0120             *nl = '\0';
0121 
0122         size = strlen(name);
0123         if (size >= len)
0124             size = len - 1;
0125         memcpy(comm, name, size);
0126         comm[size] = '\0';
0127     } else {
0128         pr_debug("Name: string not found for pid %d\n", tid);
0129     }
0130 
0131     if (tgids) {
0132         tgids += 5;  /* strlen("Tgid:") */
0133         *tgid = atoi(tgids);
0134     } else {
0135         pr_debug("Tgid: string not found for pid %d\n", tid);
0136     }
0137 
0138     if (ppids) {
0139         ppids += 5;  /* strlen("PPid:") */
0140         *ppid = atoi(ppids);
0141     } else {
0142         pr_debug("PPid: string not found for pid %d\n", tid);
0143     }
0144 
0145     if (!vmpeak && threads)
0146         *kernel = true;
0147     else
0148         *kernel = false;
0149 
0150     return 0;
0151 }
0152 
0153 static int perf_event__prepare_comm(union perf_event *event, pid_t pid, pid_t tid,
0154                     struct machine *machine,
0155                     pid_t *tgid, pid_t *ppid, bool *kernel)
0156 {
0157     size_t size;
0158 
0159     *ppid = -1;
0160 
0161     memset(&event->comm, 0, sizeof(event->comm));
0162 
0163     if (machine__is_host(machine)) {
0164         if (perf_event__get_comm_ids(pid, tid, event->comm.comm,
0165                          sizeof(event->comm.comm),
0166                          tgid, ppid, kernel) != 0) {
0167             return -1;
0168         }
0169     } else {
0170         *tgid = machine->pid;
0171     }
0172 
0173     if (*tgid < 0)
0174         return -1;
0175 
0176     event->comm.pid = *tgid;
0177     event->comm.header.type = PERF_RECORD_COMM;
0178 
0179     size = strlen(event->comm.comm) + 1;
0180     size = PERF_ALIGN(size, sizeof(u64));
0181     memset(event->comm.comm + size, 0, machine->id_hdr_size);
0182     event->comm.header.size = (sizeof(event->comm) -
0183                 (sizeof(event->comm.comm) - size) +
0184                 machine->id_hdr_size);
0185     event->comm.tid = tid;
0186 
0187     return 0;
0188 }
0189 
0190 pid_t perf_event__synthesize_comm(struct perf_tool *tool,
0191                      union perf_event *event, pid_t pid,
0192                      perf_event__handler_t process,
0193                      struct machine *machine)
0194 {
0195     pid_t tgid, ppid;
0196     bool kernel_thread;
0197 
0198     if (perf_event__prepare_comm(event, 0, pid, machine, &tgid, &ppid,
0199                      &kernel_thread) != 0)
0200         return -1;
0201 
0202     if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
0203         return -1;
0204 
0205     return tgid;
0206 }
0207 
0208 static void perf_event__get_ns_link_info(pid_t pid, const char *ns,
0209                      struct perf_ns_link_info *ns_link_info)
0210 {
0211     struct stat64 st;
0212     char proc_ns[128];
0213 
0214     sprintf(proc_ns, "/proc/%u/ns/%s", pid, ns);
0215     if (stat64(proc_ns, &st) == 0) {
0216         ns_link_info->dev = st.st_dev;
0217         ns_link_info->ino = st.st_ino;
0218     }
0219 }
0220 
0221 int perf_event__synthesize_namespaces(struct perf_tool *tool,
0222                       union perf_event *event,
0223                       pid_t pid, pid_t tgid,
0224                       perf_event__handler_t process,
0225                       struct machine *machine)
0226 {
0227     u32 idx;
0228     struct perf_ns_link_info *ns_link_info;
0229 
0230     if (!tool || !tool->namespace_events)
0231         return 0;
0232 
0233     memset(&event->namespaces, 0, (sizeof(event->namespaces) +
0234            (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
0235            machine->id_hdr_size));
0236 
0237     event->namespaces.pid = tgid;
0238     event->namespaces.tid = pid;
0239 
0240     event->namespaces.nr_namespaces = NR_NAMESPACES;
0241 
0242     ns_link_info = event->namespaces.link_info;
0243 
0244     for (idx = 0; idx < event->namespaces.nr_namespaces; idx++)
0245         perf_event__get_ns_link_info(pid, perf_ns__name(idx),
0246                          &ns_link_info[idx]);
0247 
0248     event->namespaces.header.type = PERF_RECORD_NAMESPACES;
0249 
0250     event->namespaces.header.size = (sizeof(event->namespaces) +
0251             (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
0252             machine->id_hdr_size);
0253 
0254     if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
0255         return -1;
0256 
0257     return 0;
0258 }
0259 
0260 static int perf_event__synthesize_fork(struct perf_tool *tool,
0261                        union perf_event *event,
0262                        pid_t pid, pid_t tgid, pid_t ppid,
0263                        perf_event__handler_t process,
0264                        struct machine *machine)
0265 {
0266     memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size);
0267 
0268     /*
0269      * for main thread set parent to ppid from status file. For other
0270      * threads set parent pid to main thread. ie., assume main thread
0271      * spawns all threads in a process
0272     */
0273     if (tgid == pid) {
0274         event->fork.ppid = ppid;
0275         event->fork.ptid = ppid;
0276     } else {
0277         event->fork.ppid = tgid;
0278         event->fork.ptid = tgid;
0279     }
0280     event->fork.pid  = tgid;
0281     event->fork.tid  = pid;
0282     event->fork.header.type = PERF_RECORD_FORK;
0283     event->fork.header.misc = PERF_RECORD_MISC_FORK_EXEC;
0284 
0285     event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size);
0286 
0287     if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
0288         return -1;
0289 
0290     return 0;
0291 }
0292 
0293 static bool read_proc_maps_line(struct io *io, __u64 *start, __u64 *end,
0294                 u32 *prot, u32 *flags, __u64 *offset,
0295                 u32 *maj, u32 *min,
0296                 __u64 *inode,
0297                 ssize_t pathname_size, char *pathname)
0298 {
0299     __u64 temp;
0300     int ch;
0301     char *start_pathname = pathname;
0302 
0303     if (io__get_hex(io, start) != '-')
0304         return false;
0305     if (io__get_hex(io, end) != ' ')
0306         return false;
0307 
0308     /* map protection and flags bits */
0309     *prot = 0;
0310     ch = io__get_char(io);
0311     if (ch == 'r')
0312         *prot |= PROT_READ;
0313     else if (ch != '-')
0314         return false;
0315     ch = io__get_char(io);
0316     if (ch == 'w')
0317         *prot |= PROT_WRITE;
0318     else if (ch != '-')
0319         return false;
0320     ch = io__get_char(io);
0321     if (ch == 'x')
0322         *prot |= PROT_EXEC;
0323     else if (ch != '-')
0324         return false;
0325     ch = io__get_char(io);
0326     if (ch == 's')
0327         *flags = MAP_SHARED;
0328     else if (ch == 'p')
0329         *flags = MAP_PRIVATE;
0330     else
0331         return false;
0332     if (io__get_char(io) != ' ')
0333         return false;
0334 
0335     if (io__get_hex(io, offset) != ' ')
0336         return false;
0337 
0338     if (io__get_hex(io, &temp) != ':')
0339         return false;
0340     *maj = temp;
0341     if (io__get_hex(io, &temp) != ' ')
0342         return false;
0343     *min = temp;
0344 
0345     ch = io__get_dec(io, inode);
0346     if (ch != ' ') {
0347         *pathname = '\0';
0348         return ch == '\n';
0349     }
0350     do {
0351         ch = io__get_char(io);
0352     } while (ch == ' ');
0353     while (true) {
0354         if (ch < 0)
0355             return false;
0356         if (ch == '\0' || ch == '\n' ||
0357             (pathname + 1 - start_pathname) >= pathname_size) {
0358             *pathname = '\0';
0359             return true;
0360         }
0361         *pathname++ = ch;
0362         ch = io__get_char(io);
0363     }
0364 }
0365 
0366 static void perf_record_mmap2__read_build_id(struct perf_record_mmap2 *event,
0367                          bool is_kernel)
0368 {
0369     struct build_id bid;
0370     struct nsinfo *nsi;
0371     struct nscookie nc;
0372     int rc;
0373 
0374     if (is_kernel) {
0375         rc = sysfs__read_build_id("/sys/kernel/notes", &bid);
0376         goto out;
0377     }
0378 
0379     nsi = nsinfo__new(event->pid);
0380     nsinfo__mountns_enter(nsi, &nc);
0381 
0382     rc = filename__read_build_id(event->filename, &bid) > 0 ? 0 : -1;
0383 
0384     nsinfo__mountns_exit(&nc);
0385     nsinfo__put(nsi);
0386 
0387 out:
0388     if (rc == 0) {
0389         memcpy(event->build_id, bid.data, sizeof(bid.data));
0390         event->build_id_size = (u8) bid.size;
0391         event->header.misc |= PERF_RECORD_MISC_MMAP_BUILD_ID;
0392         event->__reserved_1 = 0;
0393         event->__reserved_2 = 0;
0394     } else {
0395         if (event->filename[0] == '/') {
0396             pr_debug2("Failed to read build ID for %s\n",
0397                   event->filename);
0398         }
0399     }
0400 }
0401 
0402 int perf_event__synthesize_mmap_events(struct perf_tool *tool,
0403                        union perf_event *event,
0404                        pid_t pid, pid_t tgid,
0405                        perf_event__handler_t process,
0406                        struct machine *machine,
0407                        bool mmap_data)
0408 {
0409     unsigned long long t;
0410     char bf[BUFSIZ];
0411     struct io io;
0412     bool truncation = false;
0413     unsigned long long timeout = proc_map_timeout * 1000000ULL;
0414     int rc = 0;
0415     const char *hugetlbfs_mnt = hugetlbfs__mountpoint();
0416     int hugetlbfs_mnt_len = hugetlbfs_mnt ? strlen(hugetlbfs_mnt) : 0;
0417 
0418     if (machine__is_default_guest(machine))
0419         return 0;
0420 
0421     snprintf(bf, sizeof(bf), "%s/proc/%d/task/%d/maps",
0422         machine->root_dir, pid, pid);
0423 
0424     io.fd = open(bf, O_RDONLY, 0);
0425     if (io.fd < 0) {
0426         /*
0427          * We raced with a task exiting - just return:
0428          */
0429         pr_debug("couldn't open %s\n", bf);
0430         return -1;
0431     }
0432     io__init(&io, io.fd, bf, sizeof(bf));
0433 
0434     event->header.type = PERF_RECORD_MMAP2;
0435     t = rdclock();
0436 
0437     while (!io.eof) {
0438         static const char anonstr[] = "//anon";
0439         size_t size, aligned_size;
0440 
0441         /* ensure null termination since stack will be reused. */
0442         event->mmap2.filename[0] = '\0';
0443 
0444         /* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
0445         if (!read_proc_maps_line(&io,
0446                     &event->mmap2.start,
0447                     &event->mmap2.len,
0448                     &event->mmap2.prot,
0449                     &event->mmap2.flags,
0450                     &event->mmap2.pgoff,
0451                     &event->mmap2.maj,
0452                     &event->mmap2.min,
0453                     &event->mmap2.ino,
0454                     sizeof(event->mmap2.filename),
0455                     event->mmap2.filename))
0456             continue;
0457 
0458         if ((rdclock() - t) > timeout) {
0459             pr_warning("Reading %s/proc/%d/task/%d/maps time out. "
0460                    "You may want to increase "
0461                    "the time limit by --proc-map-timeout\n",
0462                    machine->root_dir, pid, pid);
0463             truncation = true;
0464             goto out;
0465         }
0466 
0467         event->mmap2.ino_generation = 0;
0468 
0469         /*
0470          * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
0471          */
0472         if (machine__is_host(machine))
0473             event->header.misc = PERF_RECORD_MISC_USER;
0474         else
0475             event->header.misc = PERF_RECORD_MISC_GUEST_USER;
0476 
0477         if ((event->mmap2.prot & PROT_EXEC) == 0) {
0478             if (!mmap_data || (event->mmap2.prot & PROT_READ) == 0)
0479                 continue;
0480 
0481             event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
0482         }
0483 
0484 out:
0485         if (truncation)
0486             event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT;
0487 
0488         if (!strcmp(event->mmap2.filename, ""))
0489             strcpy(event->mmap2.filename, anonstr);
0490 
0491         if (hugetlbfs_mnt_len &&
0492             !strncmp(event->mmap2.filename, hugetlbfs_mnt,
0493                  hugetlbfs_mnt_len)) {
0494             strcpy(event->mmap2.filename, anonstr);
0495             event->mmap2.flags |= MAP_HUGETLB;
0496         }
0497 
0498         size = strlen(event->mmap2.filename) + 1;
0499         aligned_size = PERF_ALIGN(size, sizeof(u64));
0500         event->mmap2.len -= event->mmap.start;
0501         event->mmap2.header.size = (sizeof(event->mmap2) -
0502                     (sizeof(event->mmap2.filename) - aligned_size));
0503         memset(event->mmap2.filename + size, 0, machine->id_hdr_size +
0504             (aligned_size - size));
0505         event->mmap2.header.size += machine->id_hdr_size;
0506         event->mmap2.pid = tgid;
0507         event->mmap2.tid = pid;
0508 
0509         if (symbol_conf.buildid_mmap2)
0510             perf_record_mmap2__read_build_id(&event->mmap2, false);
0511 
0512         if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
0513             rc = -1;
0514             break;
0515         }
0516 
0517         if (truncation)
0518             break;
0519     }
0520 
0521     close(io.fd);
0522     return rc;
0523 }
0524 
0525 #ifdef HAVE_FILE_HANDLE
0526 static int perf_event__synthesize_cgroup(struct perf_tool *tool,
0527                      union perf_event *event,
0528                      char *path, size_t mount_len,
0529                      perf_event__handler_t process,
0530                      struct machine *machine)
0531 {
0532     size_t event_size = sizeof(event->cgroup) - sizeof(event->cgroup.path);
0533     size_t path_len = strlen(path) - mount_len + 1;
0534     struct {
0535         struct file_handle fh;
0536         uint64_t cgroup_id;
0537     } handle;
0538     int mount_id;
0539 
0540     while (path_len % sizeof(u64))
0541         path[mount_len + path_len++] = '\0';
0542 
0543     memset(&event->cgroup, 0, event_size);
0544 
0545     event->cgroup.header.type = PERF_RECORD_CGROUP;
0546     event->cgroup.header.size = event_size + path_len + machine->id_hdr_size;
0547 
0548     handle.fh.handle_bytes = sizeof(handle.cgroup_id);
0549     if (name_to_handle_at(AT_FDCWD, path, &handle.fh, &mount_id, 0) < 0) {
0550         pr_debug("stat failed: %s\n", path);
0551         return -1;
0552     }
0553 
0554     event->cgroup.id = handle.cgroup_id;
0555     strncpy(event->cgroup.path, path + mount_len, path_len);
0556     memset(event->cgroup.path + path_len, 0, machine->id_hdr_size);
0557 
0558     if (perf_tool__process_synth_event(tool, event, machine, process) < 0) {
0559         pr_debug("process synth event failed\n");
0560         return -1;
0561     }
0562 
0563     return 0;
0564 }
0565 
0566 static int perf_event__walk_cgroup_tree(struct perf_tool *tool,
0567                     union perf_event *event,
0568                     char *path, size_t mount_len,
0569                     perf_event__handler_t process,
0570                     struct machine *machine)
0571 {
0572     size_t pos = strlen(path);
0573     DIR *d;
0574     struct dirent *dent;
0575     int ret = 0;
0576 
0577     if (perf_event__synthesize_cgroup(tool, event, path, mount_len,
0578                       process, machine) < 0)
0579         return -1;
0580 
0581     d = opendir(path);
0582     if (d == NULL) {
0583         pr_debug("failed to open directory: %s\n", path);
0584         return -1;
0585     }
0586 
0587     while ((dent = readdir(d)) != NULL) {
0588         if (dent->d_type != DT_DIR)
0589             continue;
0590         if (!strcmp(dent->d_name, ".") ||
0591             !strcmp(dent->d_name, ".."))
0592             continue;
0593 
0594         /* any sane path should be less than PATH_MAX */
0595         if (strlen(path) + strlen(dent->d_name) + 1 >= PATH_MAX)
0596             continue;
0597 
0598         if (path[pos - 1] != '/')
0599             strcat(path, "/");
0600         strcat(path, dent->d_name);
0601 
0602         ret = perf_event__walk_cgroup_tree(tool, event, path,
0603                            mount_len, process, machine);
0604         if (ret < 0)
0605             break;
0606 
0607         path[pos] = '\0';
0608     }
0609 
0610     closedir(d);
0611     return ret;
0612 }
0613 
0614 int perf_event__synthesize_cgroups(struct perf_tool *tool,
0615                    perf_event__handler_t process,
0616                    struct machine *machine)
0617 {
0618     union perf_event event;
0619     char cgrp_root[PATH_MAX];
0620     size_t mount_len;  /* length of mount point in the path */
0621 
0622     if (!tool || !tool->cgroup_events)
0623         return 0;
0624 
0625     if (cgroupfs_find_mountpoint(cgrp_root, PATH_MAX, "perf_event") < 0) {
0626         pr_debug("cannot find cgroup mount point\n");
0627         return -1;
0628     }
0629 
0630     mount_len = strlen(cgrp_root);
0631     /* make sure the path starts with a slash (after mount point) */
0632     strcat(cgrp_root, "/");
0633 
0634     if (perf_event__walk_cgroup_tree(tool, &event, cgrp_root, mount_len,
0635                      process, machine) < 0)
0636         return -1;
0637 
0638     return 0;
0639 }
0640 #else
0641 int perf_event__synthesize_cgroups(struct perf_tool *tool __maybe_unused,
0642                    perf_event__handler_t process __maybe_unused,
0643                    struct machine *machine __maybe_unused)
0644 {
0645     return -1;
0646 }
0647 #endif
0648 
0649 int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t process,
0650                    struct machine *machine)
0651 {
0652     int rc = 0;
0653     struct map *pos;
0654     struct maps *maps = machine__kernel_maps(machine);
0655     union perf_event *event;
0656     size_t size = symbol_conf.buildid_mmap2 ?
0657             sizeof(event->mmap2) : sizeof(event->mmap);
0658 
0659     event = zalloc(size + machine->id_hdr_size);
0660     if (event == NULL) {
0661         pr_debug("Not enough memory synthesizing mmap event "
0662              "for kernel modules\n");
0663         return -1;
0664     }
0665 
0666     /*
0667      * kernel uses 0 for user space maps, see kernel/perf_event.c
0668      * __perf_event_mmap
0669      */
0670     if (machine__is_host(machine))
0671         event->header.misc = PERF_RECORD_MISC_KERNEL;
0672     else
0673         event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
0674 
0675     maps__for_each_entry(maps, pos) {
0676         if (!__map__is_kmodule(pos))
0677             continue;
0678 
0679         if (symbol_conf.buildid_mmap2) {
0680             size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
0681             event->mmap2.header.type = PERF_RECORD_MMAP2;
0682             event->mmap2.header.size = (sizeof(event->mmap2) -
0683                         (sizeof(event->mmap2.filename) - size));
0684             memset(event->mmap2.filename + size, 0, machine->id_hdr_size);
0685             event->mmap2.header.size += machine->id_hdr_size;
0686             event->mmap2.start = pos->start;
0687             event->mmap2.len   = pos->end - pos->start;
0688             event->mmap2.pid   = machine->pid;
0689 
0690             memcpy(event->mmap2.filename, pos->dso->long_name,
0691                    pos->dso->long_name_len + 1);
0692 
0693             perf_record_mmap2__read_build_id(&event->mmap2, false);
0694         } else {
0695             size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
0696             event->mmap.header.type = PERF_RECORD_MMAP;
0697             event->mmap.header.size = (sizeof(event->mmap) -
0698                         (sizeof(event->mmap.filename) - size));
0699             memset(event->mmap.filename + size, 0, machine->id_hdr_size);
0700             event->mmap.header.size += machine->id_hdr_size;
0701             event->mmap.start = pos->start;
0702             event->mmap.len   = pos->end - pos->start;
0703             event->mmap.pid   = machine->pid;
0704 
0705             memcpy(event->mmap.filename, pos->dso->long_name,
0706                    pos->dso->long_name_len + 1);
0707         }
0708 
0709         if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
0710             rc = -1;
0711             break;
0712         }
0713     }
0714 
0715     free(event);
0716     return rc;
0717 }
0718 
0719 static int filter_task(const struct dirent *dirent)
0720 {
0721     return isdigit(dirent->d_name[0]);
0722 }
0723 
0724 static int __event__synthesize_thread(union perf_event *comm_event,
0725                       union perf_event *mmap_event,
0726                       union perf_event *fork_event,
0727                       union perf_event *namespaces_event,
0728                       pid_t pid, int full, perf_event__handler_t process,
0729                       struct perf_tool *tool, struct machine *machine,
0730                       bool needs_mmap, bool mmap_data)
0731 {
0732     char filename[PATH_MAX];
0733     struct dirent **dirent;
0734     pid_t tgid, ppid;
0735     int rc = 0;
0736     int i, n;
0737 
0738     /* special case: only send one comm event using passed in pid */
0739     if (!full) {
0740         tgid = perf_event__synthesize_comm(tool, comm_event, pid,
0741                            process, machine);
0742 
0743         if (tgid == -1)
0744             return -1;
0745 
0746         if (perf_event__synthesize_namespaces(tool, namespaces_event, pid,
0747                               tgid, process, machine) < 0)
0748             return -1;
0749 
0750         /*
0751          * send mmap only for thread group leader
0752          * see thread__init_maps()
0753          */
0754         if (pid == tgid && needs_mmap &&
0755             perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
0756                                process, machine, mmap_data))
0757             return -1;
0758 
0759         return 0;
0760     }
0761 
0762     if (machine__is_default_guest(machine))
0763         return 0;
0764 
0765     snprintf(filename, sizeof(filename), "%s/proc/%d/task",
0766          machine->root_dir, pid);
0767 
0768     n = scandir(filename, &dirent, filter_task, NULL);
0769     if (n < 0)
0770         return n;
0771 
0772     for (i = 0; i < n; i++) {
0773         char *end;
0774         pid_t _pid;
0775         bool kernel_thread = false;
0776 
0777         _pid = strtol(dirent[i]->d_name, &end, 10);
0778         if (*end)
0779             continue;
0780 
0781         /* some threads may exit just after scan, ignore it */
0782         if (perf_event__prepare_comm(comm_event, pid, _pid, machine,
0783                          &tgid, &ppid, &kernel_thread) != 0)
0784             continue;
0785 
0786         rc = -1;
0787         if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
0788                         ppid, process, machine) < 0)
0789             break;
0790 
0791         if (perf_event__synthesize_namespaces(tool, namespaces_event, _pid,
0792                               tgid, process, machine) < 0)
0793             break;
0794 
0795         /*
0796          * Send the prepared comm event
0797          */
0798         if (perf_tool__process_synth_event(tool, comm_event, machine, process) != 0)
0799             break;
0800 
0801         rc = 0;
0802         if (_pid == pid && !kernel_thread && needs_mmap) {
0803             /* process the parent's maps too */
0804             rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
0805                         process, machine, mmap_data);
0806             if (rc)
0807                 break;
0808         }
0809     }
0810 
0811     for (i = 0; i < n; i++)
0812         zfree(&dirent[i]);
0813     free(dirent);
0814 
0815     return rc;
0816 }
0817 
0818 int perf_event__synthesize_thread_map(struct perf_tool *tool,
0819                       struct perf_thread_map *threads,
0820                       perf_event__handler_t process,
0821                       struct machine *machine,
0822                       bool needs_mmap, bool mmap_data)
0823 {
0824     union perf_event *comm_event, *mmap_event, *fork_event;
0825     union perf_event *namespaces_event;
0826     int err = -1, thread, j;
0827 
0828     comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
0829     if (comm_event == NULL)
0830         goto out;
0831 
0832     mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
0833     if (mmap_event == NULL)
0834         goto out_free_comm;
0835 
0836     fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
0837     if (fork_event == NULL)
0838         goto out_free_mmap;
0839 
0840     namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
0841                   (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
0842                   machine->id_hdr_size);
0843     if (namespaces_event == NULL)
0844         goto out_free_fork;
0845 
0846     err = 0;
0847     for (thread = 0; thread < threads->nr; ++thread) {
0848         if (__event__synthesize_thread(comm_event, mmap_event,
0849                            fork_event, namespaces_event,
0850                            perf_thread_map__pid(threads, thread), 0,
0851                            process, tool, machine,
0852                            needs_mmap, mmap_data)) {
0853             err = -1;
0854             break;
0855         }
0856 
0857         /*
0858          * comm.pid is set to thread group id by
0859          * perf_event__synthesize_comm
0860          */
0861         if ((int) comm_event->comm.pid != perf_thread_map__pid(threads, thread)) {
0862             bool need_leader = true;
0863 
0864             /* is thread group leader in thread_map? */
0865             for (j = 0; j < threads->nr; ++j) {
0866                 if ((int) comm_event->comm.pid == perf_thread_map__pid(threads, j)) {
0867                     need_leader = false;
0868                     break;
0869                 }
0870             }
0871 
0872             /* if not, generate events for it */
0873             if (need_leader &&
0874                 __event__synthesize_thread(comm_event, mmap_event,
0875                                fork_event, namespaces_event,
0876                                comm_event->comm.pid, 0,
0877                                process, tool, machine,
0878                                needs_mmap, mmap_data)) {
0879                 err = -1;
0880                 break;
0881             }
0882         }
0883     }
0884     free(namespaces_event);
0885 out_free_fork:
0886     free(fork_event);
0887 out_free_mmap:
0888     free(mmap_event);
0889 out_free_comm:
0890     free(comm_event);
0891 out:
0892     return err;
0893 }
0894 
0895 static int __perf_event__synthesize_threads(struct perf_tool *tool,
0896                         perf_event__handler_t process,
0897                         struct machine *machine,
0898                         bool needs_mmap,
0899                         bool mmap_data,
0900                         struct dirent **dirent,
0901                         int start,
0902                         int num)
0903 {
0904     union perf_event *comm_event, *mmap_event, *fork_event;
0905     union perf_event *namespaces_event;
0906     int err = -1;
0907     char *end;
0908     pid_t pid;
0909     int i;
0910 
0911     comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
0912     if (comm_event == NULL)
0913         goto out;
0914 
0915     mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
0916     if (mmap_event == NULL)
0917         goto out_free_comm;
0918 
0919     fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
0920     if (fork_event == NULL)
0921         goto out_free_mmap;
0922 
0923     namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
0924                   (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
0925                   machine->id_hdr_size);
0926     if (namespaces_event == NULL)
0927         goto out_free_fork;
0928 
0929     for (i = start; i < start + num; i++) {
0930         if (!isdigit(dirent[i]->d_name[0]))
0931             continue;
0932 
0933         pid = (pid_t)strtol(dirent[i]->d_name, &end, 10);
0934         /* only interested in proper numerical dirents */
0935         if (*end)
0936             continue;
0937         /*
0938          * We may race with exiting thread, so don't stop just because
0939          * one thread couldn't be synthesized.
0940          */
0941         __event__synthesize_thread(comm_event, mmap_event, fork_event,
0942                        namespaces_event, pid, 1, process,
0943                        tool, machine, needs_mmap, mmap_data);
0944     }
0945     err = 0;
0946 
0947     free(namespaces_event);
0948 out_free_fork:
0949     free(fork_event);
0950 out_free_mmap:
0951     free(mmap_event);
0952 out_free_comm:
0953     free(comm_event);
0954 out:
0955     return err;
0956 }
0957 
0958 struct synthesize_threads_arg {
0959     struct perf_tool *tool;
0960     perf_event__handler_t process;
0961     struct machine *machine;
0962     bool needs_mmap;
0963     bool mmap_data;
0964     struct dirent **dirent;
0965     int num;
0966     int start;
0967 };
0968 
0969 static void *synthesize_threads_worker(void *arg)
0970 {
0971     struct synthesize_threads_arg *args = arg;
0972 
0973     __perf_event__synthesize_threads(args->tool, args->process,
0974                      args->machine,
0975                      args->needs_mmap, args->mmap_data,
0976                      args->dirent,
0977                      args->start, args->num);
0978     return NULL;
0979 }
0980 
0981 int perf_event__synthesize_threads(struct perf_tool *tool,
0982                    perf_event__handler_t process,
0983                    struct machine *machine,
0984                    bool needs_mmap, bool mmap_data,
0985                    unsigned int nr_threads_synthesize)
0986 {
0987     struct synthesize_threads_arg *args = NULL;
0988     pthread_t *synthesize_threads = NULL;
0989     char proc_path[PATH_MAX];
0990     struct dirent **dirent;
0991     int num_per_thread;
0992     int m, n, i, j;
0993     int thread_nr;
0994     int base = 0;
0995     int err = -1;
0996 
0997 
0998     if (machine__is_default_guest(machine))
0999         return 0;
1000 
1001     snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
1002     n = scandir(proc_path, &dirent, filter_task, NULL);
1003     if (n < 0)
1004         return err;
1005 
1006     if (nr_threads_synthesize == UINT_MAX)
1007         thread_nr = sysconf(_SC_NPROCESSORS_ONLN);
1008     else
1009         thread_nr = nr_threads_synthesize;
1010 
1011     if (thread_nr <= 1) {
1012         err = __perf_event__synthesize_threads(tool, process,
1013                                machine,
1014                                needs_mmap, mmap_data,
1015                                dirent, base, n);
1016         goto free_dirent;
1017     }
1018     if (thread_nr > n)
1019         thread_nr = n;
1020 
1021     synthesize_threads = calloc(sizeof(pthread_t), thread_nr);
1022     if (synthesize_threads == NULL)
1023         goto free_dirent;
1024 
1025     args = calloc(sizeof(*args), thread_nr);
1026     if (args == NULL)
1027         goto free_threads;
1028 
1029     num_per_thread = n / thread_nr;
1030     m = n % thread_nr;
1031     for (i = 0; i < thread_nr; i++) {
1032         args[i].tool = tool;
1033         args[i].process = process;
1034         args[i].machine = machine;
1035         args[i].needs_mmap = needs_mmap;
1036         args[i].mmap_data = mmap_data;
1037         args[i].dirent = dirent;
1038     }
1039     for (i = 0; i < m; i++) {
1040         args[i].num = num_per_thread + 1;
1041         args[i].start = i * args[i].num;
1042     }
1043     if (i != 0)
1044         base = args[i-1].start + args[i-1].num;
1045     for (j = i; j < thread_nr; j++) {
1046         args[j].num = num_per_thread;
1047         args[j].start = base + (j - i) * args[i].num;
1048     }
1049 
1050     for (i = 0; i < thread_nr; i++) {
1051         if (pthread_create(&synthesize_threads[i], NULL,
1052                    synthesize_threads_worker, &args[i]))
1053             goto out_join;
1054     }
1055     err = 0;
1056 out_join:
1057     for (i = 0; i < thread_nr; i++)
1058         pthread_join(synthesize_threads[i], NULL);
1059     free(args);
1060 free_threads:
1061     free(synthesize_threads);
1062 free_dirent:
1063     for (i = 0; i < n; i++)
1064         zfree(&dirent[i]);
1065     free(dirent);
1066 
1067     return err;
1068 }
1069 
1070 int __weak perf_event__synthesize_extra_kmaps(struct perf_tool *tool __maybe_unused,
1071                           perf_event__handler_t process __maybe_unused,
1072                           struct machine *machine __maybe_unused)
1073 {
1074     return 0;
1075 }
1076 
1077 static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
1078                         perf_event__handler_t process,
1079                         struct machine *machine)
1080 {
1081     union perf_event *event;
1082     size_t size = symbol_conf.buildid_mmap2 ?
1083             sizeof(event->mmap2) : sizeof(event->mmap);
1084     struct map *map = machine__kernel_map(machine);
1085     struct kmap *kmap;
1086     int err;
1087 
1088     if (map == NULL)
1089         return -1;
1090 
1091     kmap = map__kmap(map);
1092     if (!kmap->ref_reloc_sym)
1093         return -1;
1094 
1095     /*
1096      * We should get this from /sys/kernel/sections/.text, but till that is
1097      * available use this, and after it is use this as a fallback for older
1098      * kernels.
1099      */
1100     event = zalloc(size + machine->id_hdr_size);
1101     if (event == NULL) {
1102         pr_debug("Not enough memory synthesizing mmap event "
1103              "for kernel modules\n");
1104         return -1;
1105     }
1106 
1107     if (machine__is_host(machine)) {
1108         /*
1109          * kernel uses PERF_RECORD_MISC_USER for user space maps,
1110          * see kernel/perf_event.c __perf_event_mmap
1111          */
1112         event->header.misc = PERF_RECORD_MISC_KERNEL;
1113     } else {
1114         event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
1115     }
1116 
1117     if (symbol_conf.buildid_mmap2) {
1118         size = snprintf(event->mmap2.filename, sizeof(event->mmap2.filename),
1119                 "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
1120         size = PERF_ALIGN(size, sizeof(u64));
1121         event->mmap2.header.type = PERF_RECORD_MMAP2;
1122         event->mmap2.header.size = (sizeof(event->mmap2) -
1123                 (sizeof(event->mmap2.filename) - size) + machine->id_hdr_size);
1124         event->mmap2.pgoff = kmap->ref_reloc_sym->addr;
1125         event->mmap2.start = map->start;
1126         event->mmap2.len   = map->end - event->mmap.start;
1127         event->mmap2.pid   = machine->pid;
1128 
1129         perf_record_mmap2__read_build_id(&event->mmap2, true);
1130     } else {
1131         size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
1132                 "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
1133         size = PERF_ALIGN(size, sizeof(u64));
1134         event->mmap.header.type = PERF_RECORD_MMAP;
1135         event->mmap.header.size = (sizeof(event->mmap) -
1136                 (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
1137         event->mmap.pgoff = kmap->ref_reloc_sym->addr;
1138         event->mmap.start = map->start;
1139         event->mmap.len   = map->end - event->mmap.start;
1140         event->mmap.pid   = machine->pid;
1141     }
1142 
1143     err = perf_tool__process_synth_event(tool, event, machine, process);
1144     free(event);
1145 
1146     return err;
1147 }
1148 
1149 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
1150                        perf_event__handler_t process,
1151                        struct machine *machine)
1152 {
1153     int err;
1154 
1155     err = __perf_event__synthesize_kernel_mmap(tool, process, machine);
1156     if (err < 0)
1157         return err;
1158 
1159     return perf_event__synthesize_extra_kmaps(tool, process, machine);
1160 }
1161 
1162 int perf_event__synthesize_thread_map2(struct perf_tool *tool,
1163                       struct perf_thread_map *threads,
1164                       perf_event__handler_t process,
1165                       struct machine *machine)
1166 {
1167     union perf_event *event;
1168     int i, err, size;
1169 
1170     size  = sizeof(event->thread_map);
1171     size += threads->nr * sizeof(event->thread_map.entries[0]);
1172 
1173     event = zalloc(size);
1174     if (!event)
1175         return -ENOMEM;
1176 
1177     event->header.type = PERF_RECORD_THREAD_MAP;
1178     event->header.size = size;
1179     event->thread_map.nr = threads->nr;
1180 
1181     for (i = 0; i < threads->nr; i++) {
1182         struct perf_record_thread_map_entry *entry = &event->thread_map.entries[i];
1183         char *comm = perf_thread_map__comm(threads, i);
1184 
1185         if (!comm)
1186             comm = (char *) "";
1187 
1188         entry->pid = perf_thread_map__pid(threads, i);
1189         strncpy((char *) &entry->comm, comm, sizeof(entry->comm));
1190     }
1191 
1192     err = process(tool, event, NULL, machine);
1193 
1194     free(event);
1195     return err;
1196 }
1197 
1198 static void synthesize_cpus(struct perf_record_cpu_map_data *data,
1199                 const struct perf_cpu_map *map)
1200 {
1201     int i, map_nr = perf_cpu_map__nr(map);
1202 
1203     data->cpus_data.nr = map_nr;
1204 
1205     for (i = 0; i < map_nr; i++)
1206         data->cpus_data.cpu[i] = perf_cpu_map__cpu(map, i).cpu;
1207 }
1208 
1209 static void synthesize_mask(struct perf_record_cpu_map_data *data,
1210                 const struct perf_cpu_map *map, int max)
1211 {
1212     int idx;
1213     struct perf_cpu cpu;
1214 
1215     /* Due to padding, the 4bytes per entry mask variant is always smaller. */
1216     data->mask32_data.nr = BITS_TO_U32(max);
1217     data->mask32_data.long_size = 4;
1218 
1219     perf_cpu_map__for_each_cpu(cpu, idx, map) {
1220         int bit_word = cpu.cpu / 32;
1221         __u32 bit_mask = 1U << (cpu.cpu & 31);
1222 
1223         data->mask32_data.mask[bit_word] |= bit_mask;
1224     }
1225 }
1226 
1227 static size_t cpus_size(const struct perf_cpu_map *map)
1228 {
1229     return sizeof(struct cpu_map_entries) + perf_cpu_map__nr(map) * sizeof(u16);
1230 }
1231 
1232 static size_t mask_size(const struct perf_cpu_map *map, int *max)
1233 {
1234     *max = perf_cpu_map__max(map).cpu;
1235     return sizeof(struct perf_record_mask_cpu_map32) + BITS_TO_U32(*max) * sizeof(__u32);
1236 }
1237 
1238 static void *cpu_map_data__alloc(const struct perf_cpu_map *map, size_t *size,
1239                  u16 *type, int *max)
1240 {
1241     size_t size_cpus, size_mask;
1242     bool is_dummy = perf_cpu_map__empty(map);
1243 
1244     /*
1245      * Both array and mask data have variable size based
1246      * on the number of cpus and their actual values.
1247      * The size of the 'struct perf_record_cpu_map_data' is:
1248      *
1249      *   array = size of 'struct cpu_map_entries' +
1250      *           number of cpus * sizeof(u64)
1251      *
1252      *   mask  = size of 'struct perf_record_record_cpu_map' +
1253      *           maximum cpu bit converted to size of longs
1254      *
1255      * and finally + the size of 'struct perf_record_cpu_map_data'.
1256      */
1257     size_cpus = cpus_size(map);
1258     size_mask = mask_size(map, max);
1259 
1260     if (is_dummy || (size_cpus < size_mask)) {
1261         *size += size_cpus;
1262         *type  = PERF_CPU_MAP__CPUS;
1263     } else {
1264         *size += size_mask;
1265         *type  = PERF_CPU_MAP__MASK;
1266     }
1267 
1268     *size += sizeof(__u16); /* For perf_record_cpu_map_data.type. */
1269     *size = PERF_ALIGN(*size, sizeof(u64));
1270     return zalloc(*size);
1271 }
1272 
1273 static void cpu_map_data__synthesize(struct perf_record_cpu_map_data *data,
1274                      const struct perf_cpu_map *map,
1275                      u16 type, int max)
1276 {
1277     data->type = type;
1278 
1279     switch (type) {
1280     case PERF_CPU_MAP__CPUS:
1281         synthesize_cpus(data, map);
1282         break;
1283     case PERF_CPU_MAP__MASK:
1284         synthesize_mask(data, map, max);
1285     default:
1286         break;
1287     }
1288 }
1289 
1290 static struct perf_record_cpu_map *cpu_map_event__new(const struct perf_cpu_map *map)
1291 {
1292     size_t size = sizeof(struct perf_event_header);
1293     struct perf_record_cpu_map *event;
1294     int max;
1295     u16 type;
1296 
1297     event = cpu_map_data__alloc(map, &size, &type, &max);
1298     if (!event)
1299         return NULL;
1300 
1301     event->header.type = PERF_RECORD_CPU_MAP;
1302     event->header.size = size;
1303     event->data.type   = type;
1304 
1305     cpu_map_data__synthesize(&event->data, map, type, max);
1306     return event;
1307 }
1308 
1309 int perf_event__synthesize_cpu_map(struct perf_tool *tool,
1310                    const struct perf_cpu_map *map,
1311                    perf_event__handler_t process,
1312                    struct machine *machine)
1313 {
1314     struct perf_record_cpu_map *event;
1315     int err;
1316 
1317     event = cpu_map_event__new(map);
1318     if (!event)
1319         return -ENOMEM;
1320 
1321     err = process(tool, (union perf_event *) event, NULL, machine);
1322 
1323     free(event);
1324     return err;
1325 }
1326 
1327 int perf_event__synthesize_stat_config(struct perf_tool *tool,
1328                        struct perf_stat_config *config,
1329                        perf_event__handler_t process,
1330                        struct machine *machine)
1331 {
1332     struct perf_record_stat_config *event;
1333     int size, i = 0, err;
1334 
1335     size  = sizeof(*event);
1336     size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0]));
1337 
1338     event = zalloc(size);
1339     if (!event)
1340         return -ENOMEM;
1341 
1342     event->header.type = PERF_RECORD_STAT_CONFIG;
1343     event->header.size = size;
1344     event->nr          = PERF_STAT_CONFIG_TERM__MAX;
1345 
1346 #define ADD(__term, __val)                  \
1347     event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term;   \
1348     event->data[i].val = __val;             \
1349     i++;
1350 
1351     ADD(AGGR_MODE,  config->aggr_mode)
1352     ADD(INTERVAL,   config->interval)
1353     ADD(SCALE,  config->scale)
1354 
1355     WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX,
1356           "stat config terms unbalanced\n");
1357 #undef ADD
1358 
1359     err = process(tool, (union perf_event *) event, NULL, machine);
1360 
1361     free(event);
1362     return err;
1363 }
1364 
1365 int perf_event__synthesize_stat(struct perf_tool *tool,
1366                 struct perf_cpu cpu, u32 thread, u64 id,
1367                 struct perf_counts_values *count,
1368                 perf_event__handler_t process,
1369                 struct machine *machine)
1370 {
1371     struct perf_record_stat event;
1372 
1373     event.header.type = PERF_RECORD_STAT;
1374     event.header.size = sizeof(event);
1375     event.header.misc = 0;
1376 
1377     event.id        = id;
1378     event.cpu       = cpu.cpu;
1379     event.thread    = thread;
1380     event.val       = count->val;
1381     event.ena       = count->ena;
1382     event.run       = count->run;
1383 
1384     return process(tool, (union perf_event *) &event, NULL, machine);
1385 }
1386 
1387 int perf_event__synthesize_stat_round(struct perf_tool *tool,
1388                       u64 evtime, u64 type,
1389                       perf_event__handler_t process,
1390                       struct machine *machine)
1391 {
1392     struct perf_record_stat_round event;
1393 
1394     event.header.type = PERF_RECORD_STAT_ROUND;
1395     event.header.size = sizeof(event);
1396     event.header.misc = 0;
1397 
1398     event.time = evtime;
1399     event.type = type;
1400 
1401     return process(tool, (union perf_event *) &event, NULL, machine);
1402 }
1403 
1404 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type, u64 read_format)
1405 {
1406     size_t sz, result = sizeof(struct perf_record_sample);
1407 
1408     if (type & PERF_SAMPLE_IDENTIFIER)
1409         result += sizeof(u64);
1410 
1411     if (type & PERF_SAMPLE_IP)
1412         result += sizeof(u64);
1413 
1414     if (type & PERF_SAMPLE_TID)
1415         result += sizeof(u64);
1416 
1417     if (type & PERF_SAMPLE_TIME)
1418         result += sizeof(u64);
1419 
1420     if (type & PERF_SAMPLE_ADDR)
1421         result += sizeof(u64);
1422 
1423     if (type & PERF_SAMPLE_ID)
1424         result += sizeof(u64);
1425 
1426     if (type & PERF_SAMPLE_STREAM_ID)
1427         result += sizeof(u64);
1428 
1429     if (type & PERF_SAMPLE_CPU)
1430         result += sizeof(u64);
1431 
1432     if (type & PERF_SAMPLE_PERIOD)
1433         result += sizeof(u64);
1434 
1435     if (type & PERF_SAMPLE_READ) {
1436         result += sizeof(u64);
1437         if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1438             result += sizeof(u64);
1439         if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1440             result += sizeof(u64);
1441         /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1442         if (read_format & PERF_FORMAT_GROUP) {
1443             sz = sample_read_value_size(read_format);
1444             result += sz * sample->read.group.nr;
1445         } else {
1446             result += sizeof(u64);
1447             if (read_format & PERF_FORMAT_LOST)
1448                 result += sizeof(u64);
1449         }
1450     }
1451 
1452     if (type & PERF_SAMPLE_CALLCHAIN) {
1453         sz = (sample->callchain->nr + 1) * sizeof(u64);
1454         result += sz;
1455     }
1456 
1457     if (type & PERF_SAMPLE_RAW) {
1458         result += sizeof(u32);
1459         result += sample->raw_size;
1460     }
1461 
1462     if (type & PERF_SAMPLE_BRANCH_STACK) {
1463         sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1464         /* nr, hw_idx */
1465         sz += 2 * sizeof(u64);
1466         result += sz;
1467     }
1468 
1469     if (type & PERF_SAMPLE_REGS_USER) {
1470         if (sample->user_regs.abi) {
1471             result += sizeof(u64);
1472             sz = hweight64(sample->user_regs.mask) * sizeof(u64);
1473             result += sz;
1474         } else {
1475             result += sizeof(u64);
1476         }
1477     }
1478 
1479     if (type & PERF_SAMPLE_STACK_USER) {
1480         sz = sample->user_stack.size;
1481         result += sizeof(u64);
1482         if (sz) {
1483             result += sz;
1484             result += sizeof(u64);
1485         }
1486     }
1487 
1488     if (type & PERF_SAMPLE_WEIGHT_TYPE)
1489         result += sizeof(u64);
1490 
1491     if (type & PERF_SAMPLE_DATA_SRC)
1492         result += sizeof(u64);
1493 
1494     if (type & PERF_SAMPLE_TRANSACTION)
1495         result += sizeof(u64);
1496 
1497     if (type & PERF_SAMPLE_REGS_INTR) {
1498         if (sample->intr_regs.abi) {
1499             result += sizeof(u64);
1500             sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
1501             result += sz;
1502         } else {
1503             result += sizeof(u64);
1504         }
1505     }
1506 
1507     if (type & PERF_SAMPLE_PHYS_ADDR)
1508         result += sizeof(u64);
1509 
1510     if (type & PERF_SAMPLE_CGROUP)
1511         result += sizeof(u64);
1512 
1513     if (type & PERF_SAMPLE_DATA_PAGE_SIZE)
1514         result += sizeof(u64);
1515 
1516     if (type & PERF_SAMPLE_CODE_PAGE_SIZE)
1517         result += sizeof(u64);
1518 
1519     if (type & PERF_SAMPLE_AUX) {
1520         result += sizeof(u64);
1521         result += sample->aux_sample.size;
1522     }
1523 
1524     return result;
1525 }
1526 
1527 void __weak arch_perf_synthesize_sample_weight(const struct perf_sample *data,
1528                            __u64 *array, u64 type __maybe_unused)
1529 {
1530     *array = data->weight;
1531 }
1532 
1533 static __u64 *copy_read_group_values(__u64 *array, __u64 read_format,
1534                      const struct perf_sample *sample)
1535 {
1536     size_t sz = sample_read_value_size(read_format);
1537     struct sample_read_value *v = sample->read.group.values;
1538 
1539     sample_read_group__for_each(v, sample->read.group.nr, read_format) {
1540         /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1541         memcpy(array, v, sz);
1542         array = (void *)array + sz;
1543     }
1544     return array;
1545 }
1546 
1547 int perf_event__synthesize_sample(union perf_event *event, u64 type, u64 read_format,
1548                   const struct perf_sample *sample)
1549 {
1550     __u64 *array;
1551     size_t sz;
1552     /*
1553      * used for cross-endian analysis. See git commit 65014ab3
1554      * for why this goofiness is needed.
1555      */
1556     union u64_swap u;
1557 
1558     array = event->sample.array;
1559 
1560     if (type & PERF_SAMPLE_IDENTIFIER) {
1561         *array = sample->id;
1562         array++;
1563     }
1564 
1565     if (type & PERF_SAMPLE_IP) {
1566         *array = sample->ip;
1567         array++;
1568     }
1569 
1570     if (type & PERF_SAMPLE_TID) {
1571         u.val32[0] = sample->pid;
1572         u.val32[1] = sample->tid;
1573         *array = u.val64;
1574         array++;
1575     }
1576 
1577     if (type & PERF_SAMPLE_TIME) {
1578         *array = sample->time;
1579         array++;
1580     }
1581 
1582     if (type & PERF_SAMPLE_ADDR) {
1583         *array = sample->addr;
1584         array++;
1585     }
1586 
1587     if (type & PERF_SAMPLE_ID) {
1588         *array = sample->id;
1589         array++;
1590     }
1591 
1592     if (type & PERF_SAMPLE_STREAM_ID) {
1593         *array = sample->stream_id;
1594         array++;
1595     }
1596 
1597     if (type & PERF_SAMPLE_CPU) {
1598         u.val32[0] = sample->cpu;
1599         u.val32[1] = 0;
1600         *array = u.val64;
1601         array++;
1602     }
1603 
1604     if (type & PERF_SAMPLE_PERIOD) {
1605         *array = sample->period;
1606         array++;
1607     }
1608 
1609     if (type & PERF_SAMPLE_READ) {
1610         if (read_format & PERF_FORMAT_GROUP)
1611             *array = sample->read.group.nr;
1612         else
1613             *array = sample->read.one.value;
1614         array++;
1615 
1616         if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1617             *array = sample->read.time_enabled;
1618             array++;
1619         }
1620 
1621         if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1622             *array = sample->read.time_running;
1623             array++;
1624         }
1625 
1626         /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1627         if (read_format & PERF_FORMAT_GROUP) {
1628             array = copy_read_group_values(array, read_format,
1629                                sample);
1630         } else {
1631             *array = sample->read.one.id;
1632             array++;
1633 
1634             if (read_format & PERF_FORMAT_LOST) {
1635                 *array = sample->read.one.lost;
1636                 array++;
1637             }
1638         }
1639     }
1640 
1641     if (type & PERF_SAMPLE_CALLCHAIN) {
1642         sz = (sample->callchain->nr + 1) * sizeof(u64);
1643         memcpy(array, sample->callchain, sz);
1644         array = (void *)array + sz;
1645     }
1646 
1647     if (type & PERF_SAMPLE_RAW) {
1648         u.val32[0] = sample->raw_size;
1649         *array = u.val64;
1650         array = (void *)array + sizeof(u32);
1651 
1652         memcpy(array, sample->raw_data, sample->raw_size);
1653         array = (void *)array + sample->raw_size;
1654     }
1655 
1656     if (type & PERF_SAMPLE_BRANCH_STACK) {
1657         sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1658         /* nr, hw_idx */
1659         sz += 2 * sizeof(u64);
1660         memcpy(array, sample->branch_stack, sz);
1661         array = (void *)array + sz;
1662     }
1663 
1664     if (type & PERF_SAMPLE_REGS_USER) {
1665         if (sample->user_regs.abi) {
1666             *array++ = sample->user_regs.abi;
1667             sz = hweight64(sample->user_regs.mask) * sizeof(u64);
1668             memcpy(array, sample->user_regs.regs, sz);
1669             array = (void *)array + sz;
1670         } else {
1671             *array++ = 0;
1672         }
1673     }
1674 
1675     if (type & PERF_SAMPLE_STACK_USER) {
1676         sz = sample->user_stack.size;
1677         *array++ = sz;
1678         if (sz) {
1679             memcpy(array, sample->user_stack.data, sz);
1680             array = (void *)array + sz;
1681             *array++ = sz;
1682         }
1683     }
1684 
1685     if (type & PERF_SAMPLE_WEIGHT_TYPE) {
1686         arch_perf_synthesize_sample_weight(sample, array, type);
1687         array++;
1688     }
1689 
1690     if (type & PERF_SAMPLE_DATA_SRC) {
1691         *array = sample->data_src;
1692         array++;
1693     }
1694 
1695     if (type & PERF_SAMPLE_TRANSACTION) {
1696         *array = sample->transaction;
1697         array++;
1698     }
1699 
1700     if (type & PERF_SAMPLE_REGS_INTR) {
1701         if (sample->intr_regs.abi) {
1702             *array++ = sample->intr_regs.abi;
1703             sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
1704             memcpy(array, sample->intr_regs.regs, sz);
1705             array = (void *)array + sz;
1706         } else {
1707             *array++ = 0;
1708         }
1709     }
1710 
1711     if (type & PERF_SAMPLE_PHYS_ADDR) {
1712         *array = sample->phys_addr;
1713         array++;
1714     }
1715 
1716     if (type & PERF_SAMPLE_CGROUP) {
1717         *array = sample->cgroup;
1718         array++;
1719     }
1720 
1721     if (type & PERF_SAMPLE_DATA_PAGE_SIZE) {
1722         *array = sample->data_page_size;
1723         array++;
1724     }
1725 
1726     if (type & PERF_SAMPLE_CODE_PAGE_SIZE) {
1727         *array = sample->code_page_size;
1728         array++;
1729     }
1730 
1731     if (type & PERF_SAMPLE_AUX) {
1732         sz = sample->aux_sample.size;
1733         *array++ = sz;
1734         memcpy(array, sample->aux_sample.data, sz);
1735         array = (void *)array + sz;
1736     }
1737 
1738     return 0;
1739 }
1740 
1741 int perf_event__synthesize_id_sample(__u64 *array, u64 type, const struct perf_sample *sample)
1742 {
1743     __u64 *start = array;
1744 
1745     /*
1746      * used for cross-endian analysis. See git commit 65014ab3
1747      * for why this goofiness is needed.
1748      */
1749     union u64_swap u;
1750 
1751     if (type & PERF_SAMPLE_TID) {
1752         u.val32[0] = sample->pid;
1753         u.val32[1] = sample->tid;
1754         *array = u.val64;
1755         array++;
1756     }
1757 
1758     if (type & PERF_SAMPLE_TIME) {
1759         *array = sample->time;
1760         array++;
1761     }
1762 
1763     if (type & PERF_SAMPLE_ID) {
1764         *array = sample->id;
1765         array++;
1766     }
1767 
1768     if (type & PERF_SAMPLE_STREAM_ID) {
1769         *array = sample->stream_id;
1770         array++;
1771     }
1772 
1773     if (type & PERF_SAMPLE_CPU) {
1774         u.val32[0] = sample->cpu;
1775         u.val32[1] = 0;
1776         *array = u.val64;
1777         array++;
1778     }
1779 
1780     if (type & PERF_SAMPLE_IDENTIFIER) {
1781         *array = sample->id;
1782         array++;
1783     }
1784 
1785     return (void *)array - (void *)start;
1786 }
1787 
1788 int __perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process,
1789                       struct evlist *evlist, struct machine *machine, size_t from)
1790 {
1791     union perf_event *ev;
1792     struct evsel *evsel;
1793     size_t nr = 0, i = 0, sz, max_nr, n, pos;
1794     size_t e1_sz = sizeof(struct id_index_entry);
1795     size_t e2_sz = sizeof(struct id_index_entry_2);
1796     size_t etot_sz = e1_sz + e2_sz;
1797     bool e2_needed = false;
1798     int err;
1799 
1800     max_nr = (UINT16_MAX - sizeof(struct perf_record_id_index)) / etot_sz;
1801 
1802     pos = 0;
1803     evlist__for_each_entry(evlist, evsel) {
1804         if (pos++ < from)
1805             continue;
1806         nr += evsel->core.ids;
1807     }
1808 
1809     if (!nr)
1810         return 0;
1811 
1812     pr_debug2("Synthesizing id index\n");
1813 
1814     n = nr > max_nr ? max_nr : nr;
1815     sz = sizeof(struct perf_record_id_index) + n * etot_sz;
1816     ev = zalloc(sz);
1817     if (!ev)
1818         return -ENOMEM;
1819 
1820     sz = sizeof(struct perf_record_id_index) + n * e1_sz;
1821 
1822     ev->id_index.header.type = PERF_RECORD_ID_INDEX;
1823     ev->id_index.nr = n;
1824 
1825     pos = 0;
1826     evlist__for_each_entry(evlist, evsel) {
1827         u32 j;
1828 
1829         if (pos++ < from)
1830             continue;
1831         for (j = 0; j < evsel->core.ids; j++, i++) {
1832             struct id_index_entry *e;
1833             struct id_index_entry_2 *e2;
1834             struct perf_sample_id *sid;
1835 
1836             if (i >= n) {
1837                 ev->id_index.header.size = sz + (e2_needed ? n * e2_sz : 0);
1838                 err = process(tool, ev, NULL, machine);
1839                 if (err)
1840                     goto out_err;
1841                 nr -= n;
1842                 i = 0;
1843                 e2_needed = false;
1844             }
1845 
1846             e = &ev->id_index.entries[i];
1847 
1848             e->id = evsel->core.id[j];
1849 
1850             sid = evlist__id2sid(evlist, e->id);
1851             if (!sid) {
1852                 free(ev);
1853                 return -ENOENT;
1854             }
1855 
1856             e->idx = sid->idx;
1857             e->cpu = sid->cpu.cpu;
1858             e->tid = sid->tid;
1859 
1860             if (sid->machine_pid)
1861                 e2_needed = true;
1862 
1863             e2 = (void *)ev + sz;
1864             e2[i].machine_pid = sid->machine_pid;
1865             e2[i].vcpu        = sid->vcpu.cpu;
1866         }
1867     }
1868 
1869     sz = sizeof(struct perf_record_id_index) + nr * e1_sz;
1870     ev->id_index.header.size = sz + (e2_needed ? nr * e2_sz : 0);
1871     ev->id_index.nr = nr;
1872 
1873     err = process(tool, ev, NULL, machine);
1874 out_err:
1875     free(ev);
1876 
1877     return err;
1878 }
1879 
1880 int perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process,
1881                     struct evlist *evlist, struct machine *machine)
1882 {
1883     return __perf_event__synthesize_id_index(tool, process, evlist, machine, 0);
1884 }
1885 
1886 int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
1887                   struct target *target, struct perf_thread_map *threads,
1888                   perf_event__handler_t process, bool needs_mmap,
1889                   bool data_mmap, unsigned int nr_threads_synthesize)
1890 {
1891     /*
1892      * When perf runs in non-root PID namespace, and the namespace's proc FS
1893      * is not mounted, nsinfo__is_in_root_namespace() returns false.
1894      * In this case, the proc FS is coming for the parent namespace, thus
1895      * perf tool will wrongly gather process info from its parent PID
1896      * namespace.
1897      *
1898      * To avoid the confusion that the perf tool runs in a child PID
1899      * namespace but it synthesizes thread info from its parent PID
1900      * namespace, returns failure with warning.
1901      */
1902     if (!nsinfo__is_in_root_namespace()) {
1903         pr_err("Perf runs in non-root PID namespace but it tries to ");
1904         pr_err("gather process info from its parent PID namespace.\n");
1905         pr_err("Please mount the proc file system properly, e.g. ");
1906         pr_err("add the option '--mount-proc' for unshare command.\n");
1907         return -EPERM;
1908     }
1909 
1910     if (target__has_task(target))
1911         return perf_event__synthesize_thread_map(tool, threads, process, machine,
1912                              needs_mmap, data_mmap);
1913     else if (target__has_cpu(target))
1914         return perf_event__synthesize_threads(tool, process, machine,
1915                               needs_mmap, data_mmap,
1916                               nr_threads_synthesize);
1917     /* command specified */
1918     return 0;
1919 }
1920 
1921 int machine__synthesize_threads(struct machine *machine, struct target *target,
1922                 struct perf_thread_map *threads, bool needs_mmap,
1923                 bool data_mmap, unsigned int nr_threads_synthesize)
1924 {
1925     return __machine__synthesize_threads(machine, NULL, target, threads,
1926                          perf_event__process, needs_mmap,
1927                          data_mmap, nr_threads_synthesize);
1928 }
1929 
1930 static struct perf_record_event_update *event_update_event__new(size_t size, u64 type, u64 id)
1931 {
1932     struct perf_record_event_update *ev;
1933 
1934     size += sizeof(*ev);
1935     size  = PERF_ALIGN(size, sizeof(u64));
1936 
1937     ev = zalloc(size);
1938     if (ev) {
1939         ev->header.type = PERF_RECORD_EVENT_UPDATE;
1940         ev->header.size = (u16)size;
1941         ev->type    = type;
1942         ev->id      = id;
1943     }
1944     return ev;
1945 }
1946 
1947 int perf_event__synthesize_event_update_unit(struct perf_tool *tool, struct evsel *evsel,
1948                          perf_event__handler_t process)
1949 {
1950     size_t size = strlen(evsel->unit);
1951     struct perf_record_event_update *ev;
1952     int err;
1953 
1954     ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->core.id[0]);
1955     if (ev == NULL)
1956         return -ENOMEM;
1957 
1958     strlcpy(ev->data, evsel->unit, size + 1);
1959     err = process(tool, (union perf_event *)ev, NULL, NULL);
1960     free(ev);
1961     return err;
1962 }
1963 
1964 int perf_event__synthesize_event_update_scale(struct perf_tool *tool, struct evsel *evsel,
1965                           perf_event__handler_t process)
1966 {
1967     struct perf_record_event_update *ev;
1968     struct perf_record_event_update_scale *ev_data;
1969     int err;
1970 
1971     ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->core.id[0]);
1972     if (ev == NULL)
1973         return -ENOMEM;
1974 
1975     ev_data = (struct perf_record_event_update_scale *)ev->data;
1976     ev_data->scale = evsel->scale;
1977     err = process(tool, (union perf_event *)ev, NULL, NULL);
1978     free(ev);
1979     return err;
1980 }
1981 
1982 int perf_event__synthesize_event_update_name(struct perf_tool *tool, struct evsel *evsel,
1983                          perf_event__handler_t process)
1984 {
1985     struct perf_record_event_update *ev;
1986     size_t len = strlen(evsel->name);
1987     int err;
1988 
1989     ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->core.id[0]);
1990     if (ev == NULL)
1991         return -ENOMEM;
1992 
1993     strlcpy(ev->data, evsel->name, len + 1);
1994     err = process(tool, (union perf_event *)ev, NULL, NULL);
1995     free(ev);
1996     return err;
1997 }
1998 
1999 int perf_event__synthesize_event_update_cpus(struct perf_tool *tool, struct evsel *evsel,
2000                          perf_event__handler_t process)
2001 {
2002     size_t size = sizeof(struct perf_record_event_update);
2003     struct perf_record_event_update *ev;
2004     int max, err;
2005     u16 type;
2006 
2007     if (!evsel->core.own_cpus)
2008         return 0;
2009 
2010     ev = cpu_map_data__alloc(evsel->core.own_cpus, &size, &type, &max);
2011     if (!ev)
2012         return -ENOMEM;
2013 
2014     ev->header.type = PERF_RECORD_EVENT_UPDATE;
2015     ev->header.size = (u16)size;
2016     ev->type    = PERF_EVENT_UPDATE__CPUS;
2017     ev->id      = evsel->core.id[0];
2018 
2019     cpu_map_data__synthesize((struct perf_record_cpu_map_data *)ev->data,
2020                  evsel->core.own_cpus, type, max);
2021 
2022     err = process(tool, (union perf_event *)ev, NULL, NULL);
2023     free(ev);
2024     return err;
2025 }
2026 
2027 int perf_event__synthesize_attrs(struct perf_tool *tool, struct evlist *evlist,
2028                  perf_event__handler_t process)
2029 {
2030     struct evsel *evsel;
2031     int err = 0;
2032 
2033     evlist__for_each_entry(evlist, evsel) {
2034         err = perf_event__synthesize_attr(tool, &evsel->core.attr, evsel->core.ids,
2035                           evsel->core.id, process);
2036         if (err) {
2037             pr_debug("failed to create perf header attribute\n");
2038             return err;
2039         }
2040     }
2041 
2042     return err;
2043 }
2044 
2045 static bool has_unit(struct evsel *evsel)
2046 {
2047     return evsel->unit && *evsel->unit;
2048 }
2049 
2050 static bool has_scale(struct evsel *evsel)
2051 {
2052     return evsel->scale != 1;
2053 }
2054 
2055 int perf_event__synthesize_extra_attr(struct perf_tool *tool, struct evlist *evsel_list,
2056                       perf_event__handler_t process, bool is_pipe)
2057 {
2058     struct evsel *evsel;
2059     int err;
2060 
2061     /*
2062      * Synthesize other events stuff not carried within
2063      * attr event - unit, scale, name
2064      */
2065     evlist__for_each_entry(evsel_list, evsel) {
2066         if (!evsel->supported)
2067             continue;
2068 
2069         /*
2070          * Synthesize unit and scale only if it's defined.
2071          */
2072         if (has_unit(evsel)) {
2073             err = perf_event__synthesize_event_update_unit(tool, evsel, process);
2074             if (err < 0) {
2075                 pr_err("Couldn't synthesize evsel unit.\n");
2076                 return err;
2077             }
2078         }
2079 
2080         if (has_scale(evsel)) {
2081             err = perf_event__synthesize_event_update_scale(tool, evsel, process);
2082             if (err < 0) {
2083                 pr_err("Couldn't synthesize evsel evsel.\n");
2084                 return err;
2085             }
2086         }
2087 
2088         if (evsel->core.own_cpus) {
2089             err = perf_event__synthesize_event_update_cpus(tool, evsel, process);
2090             if (err < 0) {
2091                 pr_err("Couldn't synthesize evsel cpus.\n");
2092                 return err;
2093             }
2094         }
2095 
2096         /*
2097          * Name is needed only for pipe output,
2098          * perf.data carries event names.
2099          */
2100         if (is_pipe) {
2101             err = perf_event__synthesize_event_update_name(tool, evsel, process);
2102             if (err < 0) {
2103                 pr_err("Couldn't synthesize evsel name.\n");
2104                 return err;
2105             }
2106         }
2107     }
2108     return 0;
2109 }
2110 
2111 int perf_event__synthesize_attr(struct perf_tool *tool, struct perf_event_attr *attr,
2112                 u32 ids, u64 *id, perf_event__handler_t process)
2113 {
2114     union perf_event *ev;
2115     size_t size;
2116     int err;
2117 
2118     size = sizeof(struct perf_event_attr);
2119     size = PERF_ALIGN(size, sizeof(u64));
2120     size += sizeof(struct perf_event_header);
2121     size += ids * sizeof(u64);
2122 
2123     ev = zalloc(size);
2124 
2125     if (ev == NULL)
2126         return -ENOMEM;
2127 
2128     ev->attr.attr = *attr;
2129     memcpy(ev->attr.id, id, ids * sizeof(u64));
2130 
2131     ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
2132     ev->attr.header.size = (u16)size;
2133 
2134     if (ev->attr.header.size == size)
2135         err = process(tool, ev, NULL, NULL);
2136     else
2137         err = -E2BIG;
2138 
2139     free(ev);
2140 
2141     return err;
2142 }
2143 
2144 int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd, struct evlist *evlist,
2145                     perf_event__handler_t process)
2146 {
2147     union perf_event ev;
2148     struct tracing_data *tdata;
2149     ssize_t size = 0, aligned_size = 0, padding;
2150     struct feat_fd ff;
2151 
2152     /*
2153      * We are going to store the size of the data followed
2154      * by the data contents. Since the fd descriptor is a pipe,
2155      * we cannot seek back to store the size of the data once
2156      * we know it. Instead we:
2157      *
2158      * - write the tracing data to the temp file
2159      * - get/write the data size to pipe
2160      * - write the tracing data from the temp file
2161      *   to the pipe
2162      */
2163     tdata = tracing_data_get(&evlist->core.entries, fd, true);
2164     if (!tdata)
2165         return -1;
2166 
2167     memset(&ev, 0, sizeof(ev));
2168 
2169     ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
2170     size = tdata->size;
2171     aligned_size = PERF_ALIGN(size, sizeof(u64));
2172     padding = aligned_size - size;
2173     ev.tracing_data.header.size = sizeof(ev.tracing_data);
2174     ev.tracing_data.size = aligned_size;
2175 
2176     process(tool, &ev, NULL, NULL);
2177 
2178     /*
2179      * The put function will copy all the tracing data
2180      * stored in temp file to the pipe.
2181      */
2182     tracing_data_put(tdata);
2183 
2184     ff = (struct feat_fd){ .fd = fd };
2185     if (write_padded(&ff, NULL, 0, padding))
2186         return -1;
2187 
2188     return aligned_size;
2189 }
2190 
2191 int perf_event__synthesize_build_id(struct perf_tool *tool, struct dso *pos, u16 misc,
2192                     perf_event__handler_t process, struct machine *machine)
2193 {
2194     union perf_event ev;
2195     size_t len;
2196 
2197     if (!pos->hit)
2198         return 0;
2199 
2200     memset(&ev, 0, sizeof(ev));
2201 
2202     len = pos->long_name_len + 1;
2203     len = PERF_ALIGN(len, NAME_ALIGN);
2204     memcpy(&ev.build_id.build_id, pos->bid.data, sizeof(pos->bid.data));
2205     ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
2206     ev.build_id.header.misc = misc;
2207     ev.build_id.pid = machine->pid;
2208     ev.build_id.header.size = sizeof(ev.build_id) + len;
2209     memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
2210 
2211     return process(tool, &ev, NULL, machine);
2212 }
2213 
2214 int perf_event__synthesize_stat_events(struct perf_stat_config *config, struct perf_tool *tool,
2215                        struct evlist *evlist, perf_event__handler_t process, bool attrs)
2216 {
2217     int err;
2218 
2219     if (attrs) {
2220         err = perf_event__synthesize_attrs(tool, evlist, process);
2221         if (err < 0) {
2222             pr_err("Couldn't synthesize attrs.\n");
2223             return err;
2224         }
2225     }
2226 
2227     err = perf_event__synthesize_extra_attr(tool, evlist, process, attrs);
2228     err = perf_event__synthesize_thread_map2(tool, evlist->core.threads, process, NULL);
2229     if (err < 0) {
2230         pr_err("Couldn't synthesize thread map.\n");
2231         return err;
2232     }
2233 
2234     err = perf_event__synthesize_cpu_map(tool, evlist->core.user_requested_cpus, process, NULL);
2235     if (err < 0) {
2236         pr_err("Couldn't synthesize thread map.\n");
2237         return err;
2238     }
2239 
2240     err = perf_event__synthesize_stat_config(tool, config, process, NULL);
2241     if (err < 0) {
2242         pr_err("Couldn't synthesize config.\n");
2243         return err;
2244     }
2245 
2246     return 0;
2247 }
2248 
2249 extern const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE];
2250 
2251 int perf_event__synthesize_features(struct perf_tool *tool, struct perf_session *session,
2252                     struct evlist *evlist, perf_event__handler_t process)
2253 {
2254     struct perf_header *header = &session->header;
2255     struct perf_record_header_feature *fe;
2256     struct feat_fd ff;
2257     size_t sz, sz_hdr;
2258     int feat, ret;
2259 
2260     sz_hdr = sizeof(fe->header);
2261     sz = sizeof(union perf_event);
2262     /* get a nice alignment */
2263     sz = PERF_ALIGN(sz, page_size);
2264 
2265     memset(&ff, 0, sizeof(ff));
2266 
2267     ff.buf = malloc(sz);
2268     if (!ff.buf)
2269         return -ENOMEM;
2270 
2271     ff.size = sz - sz_hdr;
2272     ff.ph = &session->header;
2273 
2274     for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
2275         if (!feat_ops[feat].synthesize) {
2276             pr_debug("No record header feature for header :%d\n", feat);
2277             continue;
2278         }
2279 
2280         ff.offset = sizeof(*fe);
2281 
2282         ret = feat_ops[feat].write(&ff, evlist);
2283         if (ret || ff.offset <= (ssize_t)sizeof(*fe)) {
2284             pr_debug("Error writing feature\n");
2285             continue;
2286         }
2287         /* ff.buf may have changed due to realloc in do_write() */
2288         fe = ff.buf;
2289         memset(fe, 0, sizeof(*fe));
2290 
2291         fe->feat_id = feat;
2292         fe->header.type = PERF_RECORD_HEADER_FEATURE;
2293         fe->header.size = ff.offset;
2294 
2295         ret = process(tool, ff.buf, NULL, NULL);
2296         if (ret) {
2297             free(ff.buf);
2298             return ret;
2299         }
2300     }
2301 
2302     /* Send HEADER_LAST_FEATURE mark. */
2303     fe = ff.buf;
2304     fe->feat_id     = HEADER_LAST_FEATURE;
2305     fe->header.type = PERF_RECORD_HEADER_FEATURE;
2306     fe->header.size = sizeof(*fe);
2307 
2308     ret = process(tool, ff.buf, NULL, NULL);
2309 
2310     free(ff.buf);
2311     return ret;
2312 }
2313 
2314 int perf_event__synthesize_for_pipe(struct perf_tool *tool,
2315                     struct perf_session *session,
2316                     struct perf_data *data,
2317                     perf_event__handler_t process)
2318 {
2319     int err;
2320     int ret = 0;
2321     struct evlist *evlist = session->evlist;
2322 
2323     /*
2324      * We need to synthesize events first, because some
2325      * features works on top of them (on report side).
2326      */
2327     err = perf_event__synthesize_attrs(tool, evlist, process);
2328     if (err < 0) {
2329         pr_err("Couldn't synthesize attrs.\n");
2330         return err;
2331     }
2332     ret += err;
2333 
2334     err = perf_event__synthesize_features(tool, session, evlist, process);
2335     if (err < 0) {
2336         pr_err("Couldn't synthesize features.\n");
2337         return err;
2338     }
2339     ret += err;
2340 
2341     if (have_tracepoints(&evlist->core.entries)) {
2342         int fd = perf_data__fd(data);
2343 
2344         /*
2345          * FIXME err <= 0 here actually means that
2346          * there were no tracepoints so its not really
2347          * an error, just that we don't need to
2348          * synthesize anything.  We really have to
2349          * return this more properly and also
2350          * propagate errors that now are calling die()
2351          */
2352         err = perf_event__synthesize_tracing_data(tool, fd, evlist,
2353                               process);
2354         if (err <= 0) {
2355             pr_err("Couldn't record tracing data.\n");
2356             return err;
2357         }
2358         ret += err;
2359     }
2360 
2361     return ret;
2362 }
2363 
2364 int parse_synth_opt(char *synth)
2365 {
2366     char *p, *q;
2367     int ret = 0;
2368 
2369     if (synth == NULL)
2370         return -1;
2371 
2372     for (q = synth; (p = strsep(&q, ",")); p = q) {
2373         if (!strcasecmp(p, "no") || !strcasecmp(p, "none"))
2374             return 0;
2375 
2376         if (!strcasecmp(p, "all"))
2377             return PERF_SYNTH_ALL;
2378 
2379         if (!strcasecmp(p, "task"))
2380             ret |= PERF_SYNTH_TASK;
2381         else if (!strcasecmp(p, "mmap"))
2382             ret |= PERF_SYNTH_TASK | PERF_SYNTH_MMAP;
2383         else if (!strcasecmp(p, "cgroup"))
2384             ret |= PERF_SYNTH_CGROUP;
2385         else
2386             return -1;
2387     }
2388 
2389     return ret;
2390 }
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