- 根目录:
- tools
- perf
- util
- header.c
#include "util.h"
#include <sys/types.h>
#include <byteswap.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <linux/list.h>
#include <linux/kernel.h>
#include <linux/bitops.h>
#include <sys/utsname.h>
#include "evlist.h"
#include "evsel.h"
#include "header.h"
#include "../perf.h"
#include "trace-event.h"
#include "session.h"
#include "symbol.h"
#include "debug.h"
#include "cpumap.h"
#include "pmu.h"
#include "vdso.h"
#include "strbuf.h"
#include "build-id.h"
#include "data.h"
/*
* magic2 = "PERFILE2"
* must be a numerical value to let the endianness
* determine the memory layout. That way we are able
* to detect endianness when reading the perf.data file
* back.
*
* we check for legacy (PERFFILE) format.
*/
static const char *__perf_magic1 = "PERFFILE";
static const u64 __perf_magic2 = 0x32454c4946524550ULL;
static const u64 __perf_magic2_sw = 0x50455246494c4532ULL;
#define PERF_MAGIC __perf_magic2
struct perf_file_attr {
struct perf_event_attr attr;
struct perf_file_section ids;
};
void perf_header__set_feat(struct perf_header *header, int feat)
{
set_bit(feat, header->adds_features);
}
void perf_header__clear_feat(struct perf_header *header, int feat)
{
clear_bit(feat, header->adds_features);
}
bool perf_header__has_feat(const struct perf_header *header, int feat)
{
return test_bit(feat, header->adds_features);
}
static int do_write(int fd, const void *buf, size_t size)
{
while (size) {
int ret = write(fd, buf, size);
if (ret < 0)
return -errno;
size -= ret;
buf += ret;
}
return 0;
}
int write_padded(int fd, const void *bf, size_t count, size_t count_aligned)
{
static const char zero_buf[NAME_ALIGN];
int err = do_write(fd, bf, count);
if (!err)
err = do_write(fd, zero_buf, count_aligned - count);
return err;
}
#define string_size(str) \
(PERF_ALIGN((strlen(str) + 1), NAME_ALIGN) + sizeof(u32))
static int do_write_string(int fd, const char *str)
{
u32 len, olen;
int ret;
olen = strlen(str) + 1;
len = PERF_ALIGN(olen, NAME_ALIGN);
/* write len, incl. \0 */
ret = do_write(fd, &len, sizeof(len));
if (ret < 0)
return ret;
return write_padded(fd, str, olen, len);
}
static char *do_read_string(int fd, struct perf_header *ph)
{
ssize_t sz, ret;
u32 len;
char *buf;
sz = readn(fd, &len, sizeof(len));
if (sz < (ssize_t)sizeof(len))
return NULL;
if (ph->needs_swap)
len = bswap_32(len);
buf = malloc(len);
if (!buf)
return NULL;
ret = readn(fd, buf, len);
if (ret == (ssize_t)len) {
/*
* strings are padded by zeroes
* thus the actual strlen of buf
* may be less than len
*/
return buf;
}
free(buf);
return NULL;
}
static int write_tracing_data(int fd, struct perf_header *h __maybe_unused,
struct perf_evlist *evlist)
{
return read_tracing_data(fd, &evlist->entries);
}
static int write_build_id(int fd, struct perf_header *h,
struct perf_evlist *evlist __maybe_unused)
{
struct perf_session *session;
int err;
session = container_of(h, struct perf_session, header);
if (!perf_session__read_build_ids(session, true))
return -1;
err = perf_session__write_buildid_table(session, fd);
if (err < 0) {
pr_debug("failed to write buildid table\n");
return err;
}
perf_session__cache_build_ids(session);
return 0;
}
static int write_hostname(int fd, struct perf_header *h __maybe_unused,
struct perf_evlist *evlist __maybe_unused)
{
struct utsname uts;
int ret;
ret = uname(&uts);
if (ret < 0)
return -1;
return do_write_string(fd, uts.nodename);
}
static int write_osrelease(int fd, struct perf_header *h __maybe_unused,
struct perf_evlist *evlist __maybe_unused)
{
struct utsname uts;
int ret;
ret = uname(&uts);
if (ret < 0)
return -1;
return do_write_string(fd, uts.release);
}
static int write_arch(int fd, struct perf_header *h __maybe_unused,
struct perf_evlist *evlist __maybe_unused)
{
struct utsname uts;
int ret;
ret = uname(&uts);
if (ret < 0)
return -1;
return do_write_string(fd, uts.machine);
}
static int write_version(int fd, struct perf_header *h __maybe_unused,
struct perf_evlist *evlist __maybe_unused)
{
return do_write_string(fd, perf_version_string);
}
static int __write_cpudesc(int fd, const char *cpuinfo_proc)
{
FILE *file;
char *buf = NULL;
char *s, *p;
const char *search = cpuinfo_proc;
size_t len = 0;
int ret = -1;
if (!search)
return -1;
file = fopen("/proc/cpuinfo", "r");
if (!file)
return -1;
while (getline(&buf, &len, file) > 0) {
ret = strncmp(buf, search, strlen(search));
if (!ret)
break;
}
if (ret) {
ret = -1;
goto done;
}
s = buf;
p = strchr(buf, ':');
if (p && *(p+1) == ' ' && *(p+2))
s = p + 2;
p = strchr(s, '\n');
if (p)
*p = '\0';
/* squash extra space characters (branding string) */
p = s;
while (*p) {
if (isspace(*p)) {
char *r = p + 1;
char *q = r;
*p = ' ';
while (*q && isspace(*q))
q++;
if (q != (p+1))
while ((*r++ = *q++));
}
p++;
}
ret = do_write_string(fd, s);
done:
free(buf);
fclose(file);
return ret;
}
static int write_cpudesc(int fd, struct perf_header *h __maybe_unused,
struct perf_evlist *evlist __maybe_unused)
{
#ifndef CPUINFO_PROC
#define CPUINFO_PROC {"model name", }
#endif
const char *cpuinfo_procs[] = CPUINFO_PROC;
unsigned int i;
for (i = 0; i < ARRAY_SIZE(cpuinfo_procs); i++) {
int ret;
ret = __write_cpudesc(fd, cpuinfo_procs[i]);
if (ret >= 0)
return ret;
}
return -1;
}
static int write_nrcpus(int fd, struct perf_header *h __maybe_unused,
struct perf_evlist *evlist __maybe_unused)
{
long nr;
u32 nrc, nra;
int ret;
nr = sysconf(_SC_NPROCESSORS_CONF);
if (nr < 0)
return -1;
nrc = (u32)(nr & UINT_MAX);
nr = sysconf(_SC_NPROCESSORS_ONLN);
if (nr < 0)
return -1;
nra = (u32)(nr & UINT_MAX);
ret = do_write(fd, &nrc, sizeof(nrc));
if (ret < 0)
return ret;
return do_write(fd, &nra, sizeof(nra));
}
static int write_event_desc(int fd, struct perf_header *h __maybe_unused,
struct perf_evlist *evlist)
{
struct perf_evsel *evsel;
u32 nre, nri, sz;
int ret;
nre = evlist->nr_entries;
/*
* write number of events
*/
ret = do_write(fd, &nre, sizeof(nre));
if (ret < 0)
return ret;
/*
* size of perf_event_attr struct
*/
sz = (u32)sizeof(evsel->attr);
ret = do_write(fd, &sz, sizeof(sz));
if (ret < 0)
return ret;
evlist__for_each(evlist, evsel) {
ret = do_write(fd, &evsel->attr, sz);
if (ret < 0)
return ret;
/*
* write number of unique id per event
* there is one id per instance of an event
*
* copy into an nri to be independent of the
* type of ids,
*/
nri = evsel->ids;
ret = do_write(fd, &nri, sizeof(nri));
if (ret < 0)
return ret;
/*
* write event string as passed on cmdline
*/
ret = do_write_string(fd, perf_evsel__name(evsel));
if (ret < 0)
return ret;
/*
* write unique ids for this event
*/
ret = do_write(fd, evsel->id, evsel->ids * sizeof(u64));
if (ret < 0)
return ret;
}
return 0;
}
static int write_cmdline(int fd, struct perf_header *h __maybe_unused,
struct perf_evlist *evlist __maybe_unused)
{
char buf[MAXPATHLEN];
char proc[32];
u32 n;
int i, ret;
/*
* actual atual path to perf binary
*/
sprintf(proc, "/proc/%d/exe", getpid());
ret = readlink(proc, buf, sizeof(buf));
if (ret <= 0)
return -1;
/* readlink() does not add null termination */
buf[ret] = '\0';
/* account for binary path */
n = perf_env.nr_cmdline + 1;
ret = do_write(fd, &n, sizeof(n));
if (ret < 0)
return ret;
ret = do_write_string(fd, buf);
if (ret < 0)
return ret;
for (i = 0 ; i < perf_env.nr_cmdline; i++) {
ret = do_write_string(fd, perf_env.cmdline_argv[i]);
if (ret < 0)
return ret;
}
return 0;
}
#define CORE_SIB_FMT \
"/sys/devices/system/cpu/cpu%d/topology/core_siblings_list"
#define THRD_SIB_FMT \
"/sys/devices/system/cpu/cpu%d/topology/thread_siblings_list"
struct cpu_topo {
u32 cpu_nr;
u32 core_sib;
u32 thread_sib;
char **core_siblings;
char **thread_siblings;
};
static int build_cpu_topo(struct cpu_topo *tp, int cpu)
{
FILE *fp;
char filename[MAXPATHLEN];
char *buf = NULL, *p;
size_t len = 0;
ssize_t sret;
u32 i = 0;
int ret = -1;
sprintf(filename, CORE_SIB_FMT, cpu);
fp = fopen(filename, "r");
if (!fp)
goto try_threads;
sret = getline(&buf, &len, fp);
fclose(fp);
if (sret <= 0)
goto try_threads;
p = strchr(buf, '\n');
if (p)
*p = '\0';
for (i = 0; i < tp->core_sib; i++) {
if (!strcmp(buf, tp->core_siblings[i]))
break;
}
if (i == tp->core_sib) {
tp->core_siblings[i] = buf;
tp->core_sib++;
buf = NULL;
len = 0;
}
ret = 0;
try_threads:
sprintf(filename, THRD_SIB_FMT, cpu);
fp = fopen(filename, "r");
if (!fp)
goto done;
if (getline(&buf, &len, fp) <= 0)
goto done;
p = strchr(buf, '\n');
if (p)
*p = '\0';
for (i = 0; i < tp->thread_sib; i++) {
if (!strcmp(buf, tp->thread_siblings[i]))
break;
}
if (i == tp->thread_sib) {
tp->thread_siblings[i] = buf;
tp->thread_sib++;
buf = NULL;
}
ret = 0;
done:
if(fp)
fclose(fp);
free(buf);
return ret;
}
static void free_cpu_topo(struct cpu_topo *tp)
{
u32 i;
if (!tp)
return;
for (i = 0 ; i < tp->core_sib; i++)
zfree(&tp->core_siblings[i]);
for (i = 0 ; i < tp->thread_sib; i++)
zfree(&tp->thread_siblings[i]);
free(tp);
}
static struct cpu_topo *build_cpu_topology(void)
{
struct cpu_topo *tp;
void *addr;
u32 nr, i;
size_t sz;
long ncpus;
int ret = -1;
ncpus = sysconf(_SC_NPROCESSORS_CONF);
if (ncpus < 0)
return NULL;
nr = (u32)(ncpus & UINT_MAX);
sz = nr * sizeof(char *);
addr = calloc(1, sizeof(*tp) + 2 * sz);
if (!addr)
return NULL;
tp = addr;
tp->cpu_nr = nr;
addr += sizeof(*tp);
tp->core_siblings = addr;
addr += sz;
tp->thread_siblings = addr;
for (i = 0; i < nr; i++) {
ret = build_cpu_topo(tp, i);
if (ret < 0)
break;
}
if (ret) {
free_cpu_topo(tp);
tp = NULL;
}
return tp;
}
static int write_cpu_topology(int fd, struct perf_header *h __maybe_unused,
struct perf_evlist *evlist __maybe_unused)
{
struct cpu_topo *tp;
u32 i;
int ret, j;
tp = build_cpu_topology();
if (!tp)
return -1;
ret = do_write(fd, &tp->core_sib, sizeof(tp->core_sib));
if (ret < 0)
goto done;
for (i = 0; i < tp->core_sib; i++) {
ret = do_write_string(fd, tp->core_siblings[i]);
if (ret < 0)
goto done;
}
ret = do_write(fd, &tp->thread_sib, sizeof(tp->thread_sib));
if (ret < 0)
goto done;
for (i = 0; i < tp->thread_sib; i++) {
ret = do_write_string(fd, tp->thread_siblings[i]);
if (ret < 0)
break;
}
ret = perf_env__read_cpu_topology_map(&perf_env);
if (ret < 0)
goto done;
for (j = 0; j < perf_env.nr_cpus_avail; j++) {
ret = do_write(fd, &perf_env.cpu[j].core_id,
sizeof(perf_env.cpu[j].core_id));
if (ret < 0)
return ret;
ret = do_write(fd, &perf_env.cpu[j].socket_id,
sizeof(perf_env.cpu[j].socket_id));
if (ret < 0)
return ret;
}
done:
free_cpu_topo(tp);
return ret;
}
static int write_total_mem(int fd, struct perf_header *h __maybe_unused,
struct perf_evlist *evlist __maybe_unused)
{
char *buf = NULL;
FILE *fp;
size_t len = 0;
int ret = -1, n;
uint64_t mem;
fp = fopen("/proc/meminfo", "r");
if (!fp)
return -1;
while (getline(&buf, &len, fp) > 0) {
ret = strncmp(buf, "MemTotal:", 9);
if (!ret)
break;
}
if (!ret) {
n = sscanf(buf, "%*s %"PRIu64, &mem);
if (n == 1)
ret = do_write(fd, &mem, sizeof(mem));
} else
ret = -1;
free(buf);
fclose(fp);
return ret;
}
static int write_topo_node(int fd, int node)
{
char str[MAXPATHLEN];
char field[32];
char *buf = NULL, *p;
size_t len = 0;
FILE *fp;
u64 mem_total, mem_free, mem;
int ret = -1;
sprintf(str, "/sys/devices/system/node/node%d/meminfo", node);
fp = fopen(str, "r");
if (!fp)
return -1;
while (getline(&buf, &len, fp) > 0) {
/* skip over invalid lines */
if (!strchr(buf, ':'))
continue;
if (sscanf(buf, "%*s %*d %31s %"PRIu64, field, &mem) != 2)
goto done;
if (!strcmp(field, "MemTotal:"))
mem_total = mem;
if (!strcmp(field, "MemFree:"))
mem_free = mem;
}
fclose(fp);
fp = NULL;
ret = do_write(fd, &mem_total, sizeof(u64));
if (ret)
goto done;
ret = do_write(fd, &mem_free, sizeof(u64));
if (ret)
goto done;
ret = -1;
sprintf(str, "/sys/devices/system/node/node%d/cpulist", node);
fp = fopen(str, "r");
if (!fp)
goto done;
if (getline(&buf, &len, fp) <= 0)
goto done;
p = strchr(buf, '\n');
if (p)
*p = '\0';
ret = do_write_string(fd, buf);
done:
free(buf);
if (fp)
fclose(fp);
return ret;
}
static int write_numa_topology(int fd, struct perf_header *h __maybe_unused,
struct perf_evlist *evlist __maybe_unused)
{
char *buf = NULL;
size_t len = 0;
FILE *fp;
struct cpu_map *node_map = NULL;
char *c;
u32 nr, i, j;
int ret = -1;
fp = fopen("/sys/devices/system/node/online", "r");
if (!fp)
return -1;
if (getline(&buf, &len, fp) <= 0)
goto done;
c = strchr(buf, '\n');
if (c)
*c = '\0';
node_map = cpu_map__new(buf);
if (!node_map)
goto done;
nr = (u32)node_map->nr;
ret = do_write(fd, &nr, sizeof(nr));
if (ret < 0)
goto done;
for (i = 0; i < nr; i++) {
j = (u32)node_map->map[i];
ret = do_write(fd, &j, sizeof(j));
if (ret < 0)
break;
ret = write_topo_node(fd, i);
if (ret < 0)
break;
}
done:
free(buf);
fclose(fp);
free(node_map);
return ret;
}
/*
* File format:
*
* struct pmu_mappings {
* u32 pmu_num;
* struct pmu_map {
* u32 type;
* char name[];
* }[pmu_num];
* };
*/
static int write_pmu_mappings(int fd, struct perf_header *h __maybe_unused,
struct perf_evlist *evlist __maybe_unused)
{
struct perf_pmu *pmu = NULL;
off_t offset = lseek(fd, 0, SEEK_CUR);
__u32 pmu_num = 0;
int ret;
/* write real pmu_num later */
ret = do_write(fd, &pmu_num, sizeof(pmu_num));
if (ret < 0)
return ret;
while ((pmu = perf_pmu__scan(pmu))) {
if (!pmu->name)
continue;
pmu_num++;
ret = do_write(fd, &pmu->type, sizeof(pmu->type));
if (ret < 0)
return ret;
ret = do_write_string(fd, pmu->name);
if (ret < 0)
return ret;
}
if (pwrite(fd, &pmu_num, sizeof(pmu_num), offset) != sizeof(pmu_num)) {
/* discard all */
lseek(fd, offset, SEEK_SET);
return -1;
}
return 0;
}
/*
* File format:
*
* struct group_descs {
* u32 nr_groups;
* struct group_desc {
* char name[];
* u32 leader_idx;
* u32 nr_members;
* }[nr_groups];
* };
*/
static int write_group_desc(int fd, struct perf_header *h __maybe_unused,
struct perf_evlist *evlist)
{
u32 nr_groups = evlist->nr_groups;
struct perf_evsel *evsel;
int ret;
ret = do_write(fd, &nr_groups, sizeof(nr_groups));
if (ret < 0)
return ret;
evlist__for_each(evlist, evsel) {
if (perf_evsel__is_group_leader(evsel) &&
evsel->nr_members > 1) {
const char *name = evsel->group_name ?: "{anon_group}";
u32 leader_idx = evsel->idx;
u32 nr_members = evsel->nr_members;
ret = do_write_string(fd, name);
if (ret < 0)
return ret;
ret = do_write(fd, &leader_idx, sizeof(leader_idx));
if (ret < 0)
return ret;
ret = do_write(fd, &nr_members, sizeof(nr_members));
if (ret < 0)
return ret;
}
}
return 0;
}
/*
* default get_cpuid(): nothing gets recorded
* actual implementation must be in arch/$(ARCH)/util/header.c
*/
int __attribute__ ((weak)) get_cpuid(char *buffer __maybe_unused,
size_t sz __maybe_unused)
{
return -1;
}
static int write_cpuid(int fd, struct perf_header *h __maybe_unused,
struct perf_evlist *evlist __maybe_unused)
{
char buffer[64];
int ret;
ret = get_cpuid(buffer, sizeof(buffer));
if (!ret)
goto write_it;
return -1;
write_it:
return do_write_string(fd, buffer);
}
static int write_branch_stack(int fd __maybe_unused,
struct perf_header *h __maybe_unused,
struct perf_evlist *evlist __maybe_unused)
{
return 0;
}
static int write_auxtrace(int fd, struct perf_header *h,
struct perf_evlist *evlist __maybe_unused)
{
struct perf_session *session;
int err;
session = container_of(h, struct perf_session, header);
err = auxtrace_index__write(fd, &session->auxtrace_index);
if (err < 0)
pr_err("Failed to write auxtrace index\n");
return err;
}
static void print_hostname(struct perf_header *ph, int fd __maybe_unused,
FILE *fp)
{
fprintf(fp, "# hostname : %s\n", ph->env.hostname);
}
static void print_osrelease(struct perf_header *ph, int fd __maybe_unused,
FILE *fp)
{
fprintf(fp, "# os release : %s\n", ph->env.os_release);
}
static void print_arch(struct perf_header *ph, int fd __maybe_unused, FILE *fp)
{
fprintf(fp, "# arch : %s\n", ph->env.arch);
}
static void print_cpudesc(struct perf_header *ph, int fd __maybe_unused,
FILE *fp)
{
fprintf(fp, "# cpudesc : %s\n", ph->env.cpu_desc);
}
static void print_nrcpus(struct perf_header *ph, int fd __maybe_unused,
FILE *fp)
{
fprintf(fp, "# nrcpus online : %u\n", ph->env.nr_cpus_online);
fprintf(fp, "# nrcpus avail : %u\n", ph->env.nr_cpus_avail);
}
static void print_version(struct perf_header *ph, int fd __maybe_unused,
FILE *fp)
{
fprintf(fp, "# perf version : %s\n", ph->env.version);
}
static void print_cmdline(struct perf_header *ph, int fd __maybe_unused,
FILE *fp)
{
int nr, i;
nr = ph->env.nr_cmdline;
fprintf(fp, "# cmdline : ");
for (i = 0; i < nr; i++)
fprintf(fp, "%s ", ph->env.cmdline_argv[i]);
fputc('\n', fp);
}
static void print_cpu_topology(struct perf_header *ph, int fd __maybe_unused,
FILE *fp)
{
int nr, i;
char *str;
int cpu_nr = ph->env.nr_cpus_online;
nr = ph->env.nr_sibling_cores;
str = ph->env.sibling_cores;
for (i = 0; i < nr; i++) {
fprintf(fp, "# sibling cores : %s\n", str);
str += strlen(str) + 1;
}
nr = ph->env.nr_sibling_threads;
str = ph->env.sibling_threads;
for (i = 0; i < nr; i++) {
fprintf(fp, "# sibling threads : %s\n", str);
str += strlen(str) + 1;
}
if (ph->env.cpu != NULL) {
for (i = 0; i < cpu_nr; i++)
fprintf(fp, "# CPU %d: Core ID %d, Socket ID %d\n", i,
ph->env.cpu[i].core_id, ph->env.cpu[i].socket_id);
} else
fprintf(fp, "# Core ID and Socket ID information is not available\n");
}
static void free_event_desc(struct perf_evsel *events)
{
struct perf_evsel *evsel;
if (!events)
return;
for (evsel = events; evsel->attr.size; evsel++) {
zfree(&evsel->name);
zfree(&evsel->id);
}
free(events);
}
static struct perf_evsel *
read_event_desc(struct perf_header *ph, int fd)
{
struct perf_evsel *evsel, *events = NULL;
u64 *id;
void *buf = NULL;
u32 nre, sz, nr, i, j;
ssize_t ret;
size_t msz;
/* number of events */
ret = readn(fd, &nre, sizeof(nre));
if (ret != (ssize_t)sizeof(nre))
goto error;
if (ph->needs_swap)
nre = bswap_32(nre);
ret = readn(fd, &sz, sizeof(sz));
if (ret != (ssize_t)sizeof(sz))
goto error;
if (ph->needs_swap)
sz = bswap_32(sz);
/* buffer to hold on file attr struct */
buf = malloc(sz);
if (!buf)
goto error;
/* the last event terminates with evsel->attr.size == 0: */
events = calloc(nre + 1, sizeof(*events));
if (!events)
goto error;
msz = sizeof(evsel->attr);
if (sz < msz)
msz = sz;
for (i = 0, evsel = events; i < nre; evsel++, i++) {
evsel->idx = i;
/*
* must read entire on-file attr struct to
* sync up with layout.
*/
ret = readn(fd, buf, sz);
if (ret != (ssize_t)sz)
goto error;
if (ph->needs_swap)
perf_event__attr_swap(buf);
memcpy(&evsel->attr, buf, msz);
ret = readn(fd, &nr, sizeof(nr));
if (ret != (ssize_t)sizeof(nr))
goto error;
if (ph->needs_swap) {
nr = bswap_32(nr);
evsel->needs_swap = true;
}
evsel->name = do_read_string(fd, ph);
if (!nr)
continue;
id = calloc(nr, sizeof(*id));
if (!id)
goto error;
evsel->ids = nr;
evsel->id = id;
for (j = 0 ; j < nr; j++) {
ret = readn(fd, id, sizeof(*id));
if (ret != (ssize_t)sizeof(*id))
goto error;
if (ph->needs_swap)
*id = bswap_64(*id);
id++;
}
}
out:
free(buf);
return events;
error:
free_event_desc(events);
events = NULL;
goto out;
}
static int __desc_attr__fprintf(FILE *fp, const char *name, const char *val,
void *priv __attribute__((unused)))
{
return fprintf(fp, ", %s = %s", name, val);
}
static void print_event_desc(struct perf_header *ph, int fd, FILE *fp)
{
struct perf_evsel *evsel, *events = read_event_desc(ph, fd);
u32 j;
u64 *id;
if (!events) {
fprintf(fp, "# event desc: not available or unable to read\n");
return;
}
for (evsel = events; evsel->attr.size; evsel++) {
fprintf(fp, "# event : name = %s, ", evsel->name);
if (evsel->ids) {
fprintf(fp, ", id = {");
for (j = 0, id = evsel->id; j < evsel->ids; j++, id++) {
if (j)
fputc(',', fp);
fprintf(fp, " %"PRIu64, *id);
}
fprintf(fp, " }");
}
perf_event_attr__fprintf(fp, &evsel->attr, __desc_attr__fprintf, NULL);
fputc('\n', fp);
}
free_event_desc(events);
}
static void print_total_mem(struct perf_header *ph, int fd __maybe_unused,
FILE *fp)
{
fprintf(fp, "# total memory : %Lu kB\n", ph->env.total_mem);
}
static void print_numa_topology(struct perf_header *ph, int fd __maybe_unused,
FILE *fp)
{
u32 nr, c, i;
char *str, *tmp;
uint64_t mem_total, mem_free;
/* nr nodes */
nr = ph->env.nr_numa_nodes;
str = ph->env.numa_nodes;
for (i = 0; i < nr; i++) {
/* node number */
c = strtoul(str, &tmp, 0);
if (*tmp != ':')
goto error;
str = tmp + 1;
mem_total = strtoull(str, &tmp, 0);
if (*tmp != ':')
goto error;
str = tmp + 1;
mem_free = strtoull(str, &tmp, 0);
if (*tmp != ':')
goto error;
fprintf(fp, "# node%u meminfo : total = %"PRIu64" kB,"
" free = %"PRIu64" kB\n",
c, mem_total, mem_free);
str = tmp + 1;
fprintf(fp, "# node%u cpu list : %s\n", c, str);
str += strlen(str) + 1;
}
return;
error:
fprintf(fp, "# numa topology : not available\n");
}
static void print_cpuid(struct perf_header *ph, int fd __maybe_unused, FILE *fp)
{
fprintf(fp, "# cpuid : %s\n", ph->env.cpuid);
}
static void print_branch_stack(struct perf_header *ph __maybe_unused,
int fd __maybe_unused, FILE *fp)
{
fprintf(fp, "# contains samples with branch stack\n");
}
static void print_auxtrace(struct perf_header *ph __maybe_unused,
int fd __maybe_unused, FILE *fp)
{
fprintf(fp, "# contains AUX area data (e.g. instruction trace)\n");
}
static void print_pmu_mappings(struct perf_header *ph, int fd __maybe_unused,
FILE *fp)
{
const char *delimiter = "# pmu mappings: ";
char *str, *tmp;
u32 pmu_num;
u32 type;
pmu_num = ph->env.nr_pmu_mappings;
if (!pmu_num) {
fprintf(fp, "# pmu mappings: not available\n");
return;
}
str = ph->env.pmu_mappings;
while (pmu_num) {
type = strtoul(str, &tmp, 0);
if (*tmp != ':')
goto error;
str = tmp + 1;
fprintf(fp, "%s%s = %" PRIu32, delimiter, str, type);
delimiter = ", ";
str += strlen(str) + 1;
pmu_num--;
}
fprintf(fp, "\n");
if (!pmu_num)
return;
error:
fprintf(fp, "# pmu mappings: unable to read\n");
}
static void print_group_desc(struct perf_header *ph, int fd __maybe_unused,
FILE *fp)
{
struct perf_session *session;
struct perf_evsel *evsel;
u32 nr = 0;
session = container_of(ph, struct perf_session, header);
evlist__for_each(session->evlist, evsel) {
if (perf_evsel__is_group_leader(evsel) &&
evsel->nr_members > 1) {
fprintf(fp, "# group: %s{%s", evsel->group_name ?: "",
perf_evsel__name(evsel));
nr = evsel->nr_members - 1;
} else if (nr) {
fprintf(fp, ",%s", perf_evsel__name(evsel));
if (--nr == 0)
fprintf(fp, "}\n");
}
}
}
static int __event_process_build_id(struct build_id_event *bev,
char *filename,
struct perf_session *session)
{
int err = -1;
struct machine *machine;
u16 cpumode;
struct dso *dso;
enum dso_kernel_type dso_type;
machine = perf_session__findnew_machine(session, bev->pid);
if (!machine)
goto out;
cpumode = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
switch (cpumode) {
case PERF_RECORD_MISC_KERNEL:
dso_type = DSO_TYPE_KERNEL;
break;
case PERF_RECORD_MISC_GUEST_KERNEL:
dso_type = DSO_TYPE_GUEST_KERNEL;
break;
case PERF_RECORD_MISC_USER:
case PERF_RECORD_MISC_GUEST_USER:
dso_type = DSO_TYPE_USER;
break;
default:
goto out;
}
dso = machine__findnew_dso(machine, filename);
if (dso != NULL) {
char sbuild_id[BUILD_ID_SIZE * 2 + 1];
dso__set_build_id(dso, &bev->build_id);
if (!is_kernel_module(filename, cpumode))
dso->kernel = dso_type;
build_id__sprintf(dso->build_id, sizeof(dso->build_id),
sbuild_id);
pr_debug("build id event received for %s: %s\n",
dso->long_name, sbuild_id);
dso__put(dso);
}
err = 0;
out:
return err;
}
static int perf_header__read_build_ids_abi_quirk(struct perf_header *header,
int input, u64 offset, u64 size)
{
struct perf_session *session = container_of(header, struct perf_session, header);
struct {
struct perf_event_header header;
u8 build_id[PERF_ALIGN(BUILD_ID_SIZE, sizeof(u64))];
char filename[0];
} old_bev;
struct build_id_event bev;
char filename[PATH_MAX];
u64 limit = offset + size;
while (offset < limit) {
ssize_t len;
if (readn(input, &old_bev, sizeof(old_bev)) != sizeof(old_bev))
return -1;
if (header->needs_swap)
perf_event_header__bswap(&old_bev.header);
len = old_bev.header.size - sizeof(old_bev);
if (readn(input, filename, len) != len)
return -1;
bev.header = old_bev.header;
/*
* As the pid is the missing value, we need to fill
* it properly. The header.misc value give us nice hint.
*/
bev.pid = HOST_KERNEL_ID;
if (bev.header.misc == PERF_RECORD_MISC_GUEST_USER ||
bev.header.misc == PERF_RECORD_MISC_GUEST_KERNEL)
bev.pid = DEFAULT_GUEST_KERNEL_ID;
memcpy(bev.build_id, old_bev.build_id, sizeof(bev.build_id));
__event_process_build_id(&bev, filename, session);
offset += bev.header.size;
}
return 0;
}
static int perf_header__read_build_ids(struct perf_header *header,
int input, u64 offset, u64 size)
{
struct perf_session *session = container_of(header, struct perf_session, header);
struct build_id_event bev;
char filename[PATH_MAX];
u64 limit = offset + size, orig_offset = offset;
int err = -1;
while (offset < limit) {
ssize_t len;
if (readn(input, &bev, sizeof(bev)) != sizeof(bev))
goto out;
if (header->needs_swap)
perf_event_header__bswap(&bev.header);
len = bev.header.size - sizeof(bev);
if (readn(input, filename, len) != len)
goto out;
/*
* The a1645ce1 changeset:
*
* "perf: 'perf kvm' tool for monitoring guest performance from host"
*
* Added a field to struct build_id_event that broke the file
* format.
*
* Since the kernel build-id is the first entry, process the
* table using the old format if the well known
* '[kernel.kallsyms]' string for the kernel build-id has the
* first 4 characters chopped off (where the pid_t sits).
*/
if (memcmp(filename, "nel.kallsyms]", 13) == 0) {
if (lseek(input, orig_offset, SEEK_SET) == (off_t)-1)
return -1;
return perf_header__read_build_ids_abi_quirk(header, input, offset, size);
}
__event_process_build_id(&bev, filename, session);
offset += bev.header.size;
}
err = 0;
out:
return err;
}
static int process_tracing_data(struct perf_file_section *section __maybe_unused,
struct perf_header *ph __maybe_unused,
int fd, void *data)
{
ssize_t ret = trace_report(fd, data, false);
return ret < 0 ? -1 : 0;
}
static int process_build_id(struct perf_file_section *section,
struct perf_header *ph, int fd,
void *data __maybe_unused)
{
if (perf_header__read_build_ids(ph, fd, section->offset, section->size))
pr_debug("Failed to read buildids, continuing...\n");
return 0;
}
static int process_hostname(struct perf_file_section *section __maybe_unused,
struct perf_header *ph, int fd,
void *data __maybe_unused)
{
ph->env.hostname = do_read_string(fd, ph);
return ph->env.hostname ? 0 : -ENOMEM;
}
static int process_osrelease(struct perf_file_section *section __maybe_unused,
struct perf_header *ph, int fd,
void *data __maybe_unused)
{
ph->env.os_release = do_read_string(fd, ph);
return ph->env.os_release ? 0 : -ENOMEM;
}
static int process_version(struct perf_file_section *section __maybe_unused,
struct perf_header *ph, int fd,
void *data __maybe_unused)
{
ph->env.version = do_read_string(fd, ph);
return ph->env.version ? 0 : -ENOMEM;
}
static int process_arch(struct perf_file_section *section __maybe_unused,
struct perf_header *ph, int fd,
void *data __maybe_unused)
{
ph->env.arch = do_read_string(fd, ph);
return ph->env.arch ? 0 : -ENOMEM;
}
static int process_nrcpus(struct perf_file_section *section __maybe_unused,
struct perf_header *ph, int fd,
void *data __maybe_unused)
{
ssize_t ret;
u32 nr;
ret = readn(fd, &nr, sizeof(nr));
if (ret != sizeof(nr))
return -1;
if (ph->needs_swap)
nr = bswap_32(nr);
ph->env.nr_cpus_avail = nr;
ret = readn(fd, &nr, sizeof(nr));
if (ret != sizeof(nr))
return -1;
if (ph->needs_swap)
nr = bswap_32(nr);
ph->env.nr_cpus_online = nr;
return 0;
}
static int process_cpudesc(struct perf_file_section *section __maybe_unused,
struct perf_header *ph, int fd,
void *data __maybe_unused)
{
ph->env.cpu_desc = do_read_string(fd, ph);
return ph->env.cpu_desc ? 0 : -ENOMEM;
}
static int process_cpuid(struct perf_file_section *section __maybe_unused,
struct perf_header *ph, int fd,
void *data __maybe_unused)
{
ph->env.cpuid = do_read_string(fd, ph);
return ph->env.cpuid ? 0 : -ENOMEM;
}
static int process_total_mem(struct perf_file_section *section __maybe_unused,
struct perf_header *ph, int fd,
void *data __maybe_unused)
{
uint64_t mem;
ssize_t ret;
ret = readn(fd, &mem, sizeof(mem));
if (ret != sizeof(mem))
return -1;
if (ph->needs_swap)
mem = bswap_64(mem);
ph->env.total_mem = mem;
return 0;
}
static struct perf_evsel *
perf_evlist__find_by_index(struct perf_evlist *evlist, int idx)
{
struct perf_evsel *evsel;
evlist__for_each(evlist, evsel) {
if (evsel->idx == idx)
return evsel;
}
return NULL;
}
static void
perf_evlist__set_event_name(struct perf_evlist *evlist,
struct perf_evsel *event)
{
struct perf_evsel *evsel;
if (!event->name)
return;
evsel = perf_evlist__find_by_index(evlist, event->idx);
if (!evsel)
return;
if (evsel->name)
return;
evsel->name = strdup(event->name);
}
static int
process_event_desc(struct perf_file_section *section __maybe_unused,
struct perf_header *header, int fd,
void *data __maybe_unused)
{
struct perf_session *session;
struct perf_evsel *evsel, *events = read_event_desc(header, fd);
if (!events)
return 0;
session = container_of(header, struct perf_session, header);
for (evsel = events; evsel->attr.size; evsel++)
perf_evlist__set_event_name(session->evlist, evsel);
free_event_desc(events);
return 0;
}
static int process_cmdline(struct perf_file_section *section,
struct perf_header *ph, int fd,
void *data __maybe_unused)
{
ssize_t ret;
char *str, *cmdline = NULL, **argv = NULL;
u32 nr, i, len = 0;
ret = readn(fd, &nr, sizeof(nr));
if (ret != sizeof(nr))
return -1;
if (ph->needs_swap)
nr = bswap_32(nr);
ph->env.nr_cmdline = nr;
cmdline = zalloc(section->size + nr + 1);
if (!cmdline)
return -1;
argv = zalloc(sizeof(char *) * (nr + 1));
if (!argv)
goto error;
for (i = 0; i < nr; i++) {
str = do_read_string(fd, ph);
if (!str)
goto error;
argv[i] = cmdline + len;
memcpy(argv[i], str, strlen(str) + 1);
len += strlen(str) + 1;
free(str);
}
ph->env.cmdline = cmdline;
ph->env.cmdline_argv = (const char **) argv;
return 0;
error:
free(argv);
free(cmdline);
return -1;
}
static int process_cpu_topology(struct perf_file_section *section,
struct perf_header *ph, int fd,
void *data __maybe_unused)
{
ssize_t ret;
u32 nr, i;
char *str;
struct strbuf sb;
int cpu_nr = ph->env.nr_cpus_online;
u64 size = 0;
ph->env.cpu = calloc(cpu_nr, sizeof(*ph->env.cpu));
if (!ph->env.cpu)
return -1;
ret = readn(fd, &nr, sizeof(nr));
if (ret != sizeof(nr))
goto free_cpu;
if (ph->needs_swap)
nr = bswap_32(nr);
ph->env.nr_sibling_cores = nr;
size += sizeof(u32);
strbuf_init(&sb, 128);
for (i = 0; i < nr; i++) {
str = do_read_string(fd, ph);
if (!str)
goto error;
/* include a NULL character at the end */
strbuf_add(&sb, str, strlen(str) + 1);
size += string_size(str);
free(str);
}
ph->env.sibling_cores = strbuf_detach(&sb, NULL);
ret = readn(fd, &nr, sizeof(nr));
if (ret != sizeof(nr))
return -1;
if (ph->needs_swap)
nr = bswap_32(nr);
ph->env.nr_sibling_threads = nr;
size += sizeof(u32);
for (i = 0; i < nr; i++) {
str = do_read_string(fd, ph);
if (!str)
goto error;
/* include a NULL character at the end */
strbuf_add(&sb, str, strlen(str) + 1);
size += string_size(str);
free(str);
}
ph->env.sibling_threads = strbuf_detach(&sb, NULL);
/*
* The header may be from old perf,
* which doesn't include core id and socket id information.
*/
if (section->size <= size) {
zfree(&ph->env.cpu);
return 0;
}
for (i = 0; i < (u32)cpu_nr; i++) {
ret = readn(fd, &nr, sizeof(nr));
if (ret != sizeof(nr))
goto free_cpu;
if (ph->needs_swap)
nr = bswap_32(nr);
if (nr > (u32)cpu_nr) {
pr_debug("core_id number is too big."
"You may need to upgrade the perf tool.\n");
goto free_cpu;
}
ph->env.cpu[i].core_id = nr;
ret = readn(fd, &nr, sizeof(nr));
if (ret != sizeof(nr))
goto free_cpu;
if (ph->needs_swap)
nr = bswap_32(nr);
if (nr > (u32)cpu_nr) {
pr_debug("socket_id number is too big."
"You may need to upgrade the perf tool.\n");
goto free_cpu;
}
ph->env.cpu[i].socket_id = nr;
}
return 0;
error:
strbuf_release(&sb);
free_cpu:
zfree(&ph->env.cpu);
return -1;
}
static int process_numa_topology(struct perf_file_section *section __maybe_unused,
struct perf_header *ph, int fd,
void *data __maybe_unused)
{
ssize_t ret;
u32 nr, node, i;
char *str;
uint64_t mem_total, mem_free;
struct strbuf sb;
/* nr nodes */
ret = readn(fd, &nr, sizeof(nr));
if (ret != sizeof(nr))
goto error;
if (ph->needs_swap)
nr = bswap_32(nr);
ph->env.nr_numa_nodes = nr;
strbuf_init(&sb, 256);
for (i = 0; i < nr; i++) {
/* node number */
ret = readn(fd, &node, sizeof(node));
if (ret != sizeof(node))
goto error;
ret = readn(fd, &mem_total, sizeof(u64));
if (ret != sizeof(u64))
goto error;
ret = readn(fd, &mem_free, sizeof(u64));
if (ret != sizeof(u64))
goto error;
if (ph->needs_swap) {
node = bswap_32(node);
mem_total = bswap_64(mem_total);
mem_free = bswap_64(mem_free);
}
strbuf_addf(&sb, "%u:%"PRIu64":%"PRIu64":",
node, mem_total, mem_free);
str = do_read_string(fd, ph);
if (!str)
goto error;
/* include a NULL character at the end */
strbuf_add(&sb, str, strlen(str) + 1);
free(str);
}
ph->env.numa_nodes = strbuf_detach(&sb, NULL);
return 0;
error:
strbuf_release(&sb);
return -1;
}
static int process_pmu_mappings(struct perf_file_section *section __maybe_unused,
struct perf_header *ph, int fd,
void *data __maybe_unused)
{
ssize_t ret;
char *name;
u32 pmu_num;
u32 type;
struct strbuf sb;
ret = readn(fd, &pmu_num, sizeof(pmu_num));
if (ret != sizeof(pmu_num))
return -1;
if (ph->needs_swap)
pmu_num = bswap_32(pmu_num);
if (!pmu_num) {
pr_debug("pmu mappings not available\n");
return 0;
}
ph->env.nr_pmu_mappings = pmu_num;
strbuf_init(&sb, 128);
while (pmu_num) {
if (readn(fd, &type, sizeof(type)) != sizeof(type))
goto error;
if (ph->needs_swap)
type = bswap_32(type);
name = do_read_string(fd, ph);
if (!name)
goto error;
strbuf_addf(&sb, "%u:%s", type, name);
/* include a NULL character at the end */
strbuf_add(&sb, "", 1);
if (!strcmp(name, "msr"))
ph->env.msr_pmu_type = type;
free(name);
pmu_num--;
}
ph->env.pmu_mappings = strbuf_detach(&sb, NULL);
return 0;
error:
strbuf_release(&sb);
return -1;
}
static int process_group_desc(struct perf_file_section *section __maybe_unused,
struct perf_header *ph, int fd,
void *data __maybe_unused)
{
size_t ret = -1;
u32 i, nr, nr_groups;
struct perf_session *session;
struct perf_evsel *evsel, *leader = NULL;
struct group_desc {
char *name;
u32 leader_idx;
u32 nr_members;
} *desc;
if (readn(fd, &nr_groups, sizeof(nr_groups)) != sizeof(nr_groups))
return -1;
if (ph->needs_swap)
nr_groups = bswap_32(nr_groups);
ph->env.nr_groups = nr_groups;
if (!nr_groups) {
pr_debug("group desc not available\n");
return 0;
}
desc = calloc(nr_groups, sizeof(*desc));
if (!desc)
return -1;
for (i = 0; i < nr_groups; i++) {
desc[i].name = do_read_string(fd, ph);
if (!desc[i].name)
goto out_free;
if (readn(fd, &desc[i].leader_idx, sizeof(u32)) != sizeof(u32))
goto out_free;
if (readn(fd, &desc[i].nr_members, sizeof(u32)) != sizeof(u32))
goto out_free;
if (ph->needs_swap) {
desc[i].leader_idx = bswap_32(desc[i].leader_idx);
desc[i].nr_members = bswap_32(desc[i].nr_members);
}
}
/*
* Rebuild group relationship based on the group_desc
*/
session = container_of(ph, struct perf_session, header);
session->evlist->nr_groups = nr_groups;
i = nr = 0;
evlist__for_each(session->evlist, evsel) {
if (evsel->idx == (int) desc[i].leader_idx) {
evsel->leader = evsel;
/* {anon_group} is a dummy name */
if (strcmp(desc[i].name, "{anon_group}")) {
evsel->group_name = desc[i].name;
desc[i].name = NULL;
}
evsel->nr_members = desc[i].nr_members;
if (i >= nr_groups || nr > 0) {
pr_debug("invalid group desc\n");
goto out_free;
}
leader = evsel;
nr = evsel->nr_members - 1;
i++;
} else if (nr) {
/* This is a group member */
evsel->leader = leader;
nr--;
}
}
if (i != nr_groups || nr != 0) {
pr_debug("invalid group desc\n");
goto out_free;
}
ret = 0;
out_free:
for (i = 0; i < nr_groups; i++)
zfree(&desc[i].name);
free(desc);
return ret;
}
static int process_auxtrace(struct perf_file_section *section,
struct perf_header *ph, int fd,
void *data __maybe_unused)
{
struct perf_session *session;
int err;
session = container_of(ph, struct perf_session, header);
err = auxtrace_index__process(fd, section->size, session,
ph->needs_swap);
if (err < 0)
pr_err("Failed to process auxtrace index\n");
return err;
}
struct feature_ops {
int (*write)(int fd, struct perf_header *h, struct perf_evlist *evlist);
void (*print)(struct perf_header *h, int fd, FILE *fp);
int (*process)(struct perf_file_section *section,
struct perf_header *h, int fd, void *data);
const char *name;
bool full_only;
};
#define FEAT_OPA(n, func) \
[n] = { .name = #n, .write = write_##func, .print = print_##func }
#define FEAT_OPP(n, func) \
[n] = { .name = #n, .write = write_##func, .print = print_##func, \
.process = process_##func }
#define FEAT_OPF(n, func) \
[n] = { .name = #n, .write = write_##func, .print = print_##func, \
.process = process_##func, .full_only = true }
/* feature_ops not implemented: */
#define print_tracing_data NULL
#define print_build_id NULL
static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
FEAT_OPP(HEADER_TRACING_DATA, tracing_data),
FEAT_OPP(HEADER_BUILD_ID, build_id),
FEAT_OPP(HEADER_HOSTNAME, hostname),
FEAT_OPP(HEADER_OSRELEASE, osrelease),
FEAT_OPP(HEADER_VERSION, version),
FEAT_OPP(HEADER_ARCH, arch),
FEAT_OPP(HEADER_NRCPUS, nrcpus),
FEAT_OPP(HEADER_CPUDESC, cpudesc),
FEAT_OPP(HEADER_CPUID, cpuid),
FEAT_OPP(HEADER_TOTAL_MEM, total_mem),
FEAT_OPP(HEADER_EVENT_DESC, event_desc),
FEAT_OPP(HEADER_CMDLINE, cmdline),
FEAT_OPF(HEADER_CPU_TOPOLOGY, cpu_topology),
FEAT_OPF(HEADER_NUMA_TOPOLOGY, numa_topology),
FEAT_OPA(HEADER_BRANCH_STACK, branch_stack),
FEAT_OPP(HEADER_PMU_MAPPINGS, pmu_mappings),
FEAT_OPP(HEADER_GROUP_DESC, group_desc),
FEAT_OPP(HEADER_AUXTRACE, auxtrace),
};
struct header_print_data {
FILE *fp;
bool full; /* extended list of headers */
};
static int perf_file_section__fprintf_info(struct perf_file_section *section,
struct perf_header *ph,
int feat, int fd, void *data)
{
struct header_print_data *hd = data;
if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
"%d, continuing...\n", section->offset, feat);
return 0;
}
if (feat >= HEADER_LAST_FEATURE) {
pr_warning("unknown feature %d\n", feat);
return 0;
}
if (!feat_ops[feat].print)
return 0;
if (!feat_ops[feat].full_only || hd->full)
feat_ops[feat].print(ph, fd, hd->fp);
else
fprintf(hd->fp, "# %s info available, use -I to display\n",
feat_ops[feat].name);
return 0;
}
int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
{
struct header_print_data hd;
struct perf_header *header = &session->header;
int fd = perf_data_file__fd(session->file);
hd.fp = fp;
hd.full = full;
perf_header__process_sections(header, fd, &hd,
perf_file_section__fprintf_info);
return 0;
}
static int do_write_feat(int fd, struct perf_header *h, int type,
struct perf_file_section **p,
struct perf_evlist *evlist)
{
int err;
int ret = 0;
if (perf_header__has_feat(h, type)) {
if (!feat_ops[type].write)
return -1;
(*p)->offset = lseek(fd, 0, SEEK_CUR);
err = feat_ops[type].write(fd, h, evlist);
if (err < 0) {
pr_debug("failed to write feature %d\n", type);
/* undo anything written */
lseek(fd, (*p)->offset, SEEK_SET);
return -1;
}
(*p)->size = lseek(fd, 0, SEEK_CUR) - (*p)->offset;
(*p)++;
}
return ret;
}
static int perf_header__adds_write(struct perf_header *header,
struct perf_evlist *evlist, int fd)
{
int nr_sections;
struct perf_file_section *feat_sec, *p;
int sec_size;
u64 sec_start;
int feat;
int err;
nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
if (!nr_sections)
return 0;
feat_sec = p = calloc(nr_sections, sizeof(*feat_sec));
if (feat_sec == NULL)
return -ENOMEM;
sec_size = sizeof(*feat_sec) * nr_sections;
sec_start = header->feat_offset;
lseek(fd, sec_start + sec_size, SEEK_SET);
for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
if (do_write_feat(fd, header, feat, &p, evlist))
perf_header__clear_feat(header, feat);
}
lseek(fd, sec_start, SEEK_SET);
/*
* may write more than needed due to dropped feature, but
* this is okay, reader will skip the mising entries
*/
err = do_write(fd, feat_sec, sec_size);
if (err < 0)
pr_debug("failed to write feature section\n");
free(feat_sec);
return err;
}
int perf_header__write_pipe(int fd)
{
struct perf_pipe_file_header f_header;
int err;
f_header = (struct perf_pipe_file_header){
.magic = PERF_MAGIC,
.size = sizeof(f_header),
};
err = do_write(fd, &f_header, sizeof(f_header));
if (err < 0) {
pr_debug("failed to write perf pipe header\n");
return err;
}
return 0;
}
int perf_session__write_header(struct perf_session *session,
struct perf_evlist *evlist,
int fd, bool at_exit)
{
struct perf_file_header f_header;
struct perf_file_attr f_attr;
struct perf_header *header = &session->header;
struct perf_evsel *evsel;
u64 attr_offset;
int err;
lseek(fd, sizeof(f_header), SEEK_SET);
evlist__for_each(session->evlist, evsel) {
evsel->id_offset = lseek(fd, 0, SEEK_CUR);
err = do_write(fd, evsel->id, evsel->ids * sizeof(u64));
if (err < 0) {
pr_debug("failed to write perf header\n");
return err;
}
}
attr_offset = lseek(fd, 0, SEEK_CUR);
evlist__for_each(evlist, evsel) {
f_attr = (struct perf_file_attr){
.attr = evsel->attr,
.ids = {
.offset = evsel->id_offset,
.size = evsel->ids * sizeof(u64),
}
};
err = do_write(fd, &f_attr, sizeof(f_attr));
if (err < 0) {
pr_debug("failed to write perf header attribute\n");
return err;
}
}
if (!header->data_offset)
header->data_offset = lseek(fd, 0, SEEK_CUR);
header->feat_offset = header->data_offset + header->data_size;
if (at_exit) {
err = perf_header__adds_write(header, evlist, fd);
if (err < 0)
return err;
}
f_header = (struct perf_file_header){
.magic = PERF_MAGIC,
.size = sizeof(f_header),
.attr_size = sizeof(f_attr),
.attrs = {
.offset = attr_offset,
.size = evlist->nr_entries * sizeof(f_attr),
},
.data = {
.offset = header->data_offset,
.size = header->data_size,
},
/* event_types is ignored, store zeros */
};
memcpy(&f_header.adds_features, &header->adds_features, sizeof(header->adds_features));
lseek(fd, 0, SEEK_SET);
err = do_write(fd, &f_header, sizeof(f_header));
if (err < 0) {
pr_debug("failed to write perf header\n");
return err;
}
lseek(fd, header->data_offset + header->data_size, SEEK_SET);
return 0;
}
static int perf_header__getbuffer64(struct perf_header *header,
int fd, void *buf, size_t size)
{
if (readn(fd, buf, size) <= 0)
return -1;
if (header->needs_swap)
mem_bswap_64(buf, size);
return 0;
}
int perf_header__process_sections(struct perf_header *header, int fd,
void *data,
int (*process)(struct perf_file_section *section,
struct perf_header *ph,
int feat, int fd, void *data))
{
struct perf_file_section *feat_sec, *sec;
int nr_sections;
int sec_size;
int feat;
int err;
nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
if (!nr_sections)
return 0;
feat_sec = sec = calloc(nr_sections, sizeof(*feat_sec));
if (!feat_sec)
return -1;
sec_size = sizeof(*feat_sec) * nr_sections;
lseek(fd, header->feat_offset, SEEK_SET);
err = perf_header__getbuffer64(header, fd, feat_sec, sec_size);
if (err < 0)
goto out_free;
for_each_set_bit(feat, header->adds_features, HEADER_LAST_FEATURE) {
err = process(sec++, header, feat, fd, data);
if (err < 0)
goto out_free;
}
err = 0;
out_free:
free(feat_sec);
return err;
}
static const int attr_file_abi_sizes[] = {
[0] = PERF_ATTR_SIZE_VER0,
[1] = PERF_ATTR_SIZE_VER1,
[2] = PERF_ATTR_SIZE_VER2,
[3] = PERF_ATTR_SIZE_VER3,
[4] = PERF_ATTR_SIZE_VER4,
0,
};
/*
* In the legacy file format, the magic number is not used to encode endianness.
* hdr_sz was used to encode endianness. But given that hdr_sz can vary based
* on ABI revisions, we need to try all combinations for all endianness to
* detect the endianness.
*/
static int try_all_file_abis(uint64_t hdr_sz, struct perf_header *ph)
{
uint64_t ref_size, attr_size;
int i;
for (i = 0 ; attr_file_abi_sizes[i]; i++) {
ref_size = attr_file_abi_sizes[i]
+ sizeof(struct perf_file_section);
if (hdr_sz != ref_size) {
attr_size = bswap_64(hdr_sz);
if (attr_size != ref_size)
continue;
ph->needs_swap = true;
}
pr_debug("ABI%d perf.data file detected, need_swap=%d\n",
i,
ph->needs_swap);
return 0;
}
/* could not determine endianness */
return -1;
}
#define PERF_PIPE_HDR_VER0 16
static const size_t attr_pipe_abi_sizes[] = {
[0] = PERF_PIPE_HDR_VER0,
0,
};
/*
* In the legacy pipe format, there is an implicit assumption that endiannesss
* between host recording the samples, and host parsing the samples is the
* same. This is not always the case given that the pipe output may always be
* redirected into a file and analyzed on a different machine with possibly a
* different endianness and perf_event ABI revsions in the perf tool itself.
*/
static int try_all_pipe_abis(uint64_t hdr_sz, struct perf_header *ph)
{
u64 attr_size;
int i;
for (i = 0 ; attr_pipe_abi_sizes[i]; i++) {
if (hdr_sz != attr_pipe_abi_sizes[i]) {
attr_size = bswap_64(hdr_sz);
if (attr_size != hdr_sz)
continue;
ph->needs_swap = true;
}
pr_debug("Pipe ABI%d perf.data file detected\n", i);
return 0;
}
return -1;
}
bool is_perf_magic(u64 magic)
{
if (!memcmp(&magic, __perf_magic1, sizeof(magic))
|| magic == __perf_magic2
|| magic == __perf_magic2_sw)
return true;
return false;
}
static int check_magic_endian(u64 magic, uint64_t hdr_sz,
bool is_pipe, struct perf_header *ph)
{
int ret;
/* check for legacy format */
ret = memcmp(&magic, __perf_magic1, sizeof(magic));
if (ret == 0) {
ph->version = PERF_HEADER_VERSION_1;
pr_debug("legacy perf.data format\n");
if (is_pipe)
return try_all_pipe_abis(hdr_sz, ph);
return try_all_file_abis(hdr_sz, ph);
}
/*
* the new magic number serves two purposes:
* - unique number to identify actual perf.data files
* - encode endianness of file
*/
ph->version = PERF_HEADER_VERSION_2;
/* check magic number with one endianness */
if (magic == __perf_magic2)
return 0;
/* check magic number with opposite endianness */
if (magic != __perf_magic2_sw)
return -1;
ph->needs_swap = true;
return 0;
}
int perf_file_header__read(struct perf_file_header *header,
struct perf_header *ph, int fd)
{
ssize_t ret;
lseek(fd, 0, SEEK_SET);
ret = readn(fd, header, sizeof(*header));
if (ret <= 0)
return -1;
if (check_magic_endian(header->magic,
header->attr_size, false, ph) < 0) {
pr_debug("magic/endian check failed\n");
return -1;
}
if (ph->needs_swap) {
mem_bswap_64(header, offsetof(struct perf_file_header,
adds_features));
}
if (header->size != sizeof(*header)) {
/* Support the previous format */
if (header->size == offsetof(typeof(*header), adds_features))
bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
else
return -1;
} else if (ph->needs_swap) {
/*
* feature bitmap is declared as an array of unsigned longs --
* not good since its size can differ between the host that
* generated the data file and the host analyzing the file.
*
* We need to handle endianness, but we don't know the size of
* the unsigned long where the file was generated. Take a best
* guess at determining it: try 64-bit swap first (ie., file
* created on a 64-bit host), and check if the hostname feature
* bit is set (this feature bit is forced on as of fbe96f2).
* If the bit is not, undo the 64-bit swap and try a 32-bit
* swap. If the hostname bit is still not set (e.g., older data
* file), punt and fallback to the original behavior --
* clearing all feature bits and setting buildid.
*/
mem_bswap_64(&header->adds_features,
BITS_TO_U64(HEADER_FEAT_BITS));
if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
/* unswap as u64 */
mem_bswap_64(&header->adds_features,
BITS_TO_U64(HEADER_FEAT_BITS));
/* unswap as u32 */
mem_bswap_32(&header->adds_features,
BITS_TO_U32(HEADER_FEAT_BITS));
}
if (!test_bit(HEADER_HOSTNAME, header->adds_features)) {
bitmap_zero(header->adds_features, HEADER_FEAT_BITS);
set_bit(HEADER_BUILD_ID, header->adds_features);
}
}
memcpy(&ph->adds_features, &header->adds_features,
sizeof(ph->adds_features));
ph->data_offset = header->data.offset;
ph->data_size = header->data.size;
ph->feat_offset = header->data.offset + header->data.size;
return 0;
}
static int perf_file_section__process(struct perf_file_section *section,
struct perf_header *ph,
int feat, int fd, void *data)
{
if (lseek(fd, section->offset, SEEK_SET) == (off_t)-1) {
pr_debug("Failed to lseek to %" PRIu64 " offset for feature "
"%d, continuing...\n", section->offset, feat);
return 0;
}
if (feat >= HEADER_LAST_FEATURE) {
pr_debug("unknown feature %d, continuing...\n", feat);
return 0;
}
if (!feat_ops[feat].process)
return 0;
return feat_ops[feat].process(section, ph, fd, data);
}
static int perf_file_header__read_pipe(struct perf_pipe_file_header *header,
struct perf_header *ph, int fd,
bool repipe)
{
ssize_t ret;
ret = readn(fd, header, sizeof(*header));
if (ret <= 0)
return -1;
if (check_magic_endian(header->magic, header->size, true, ph) < 0) {
pr_debug("endian/magic failed\n");
return -1;
}
if (ph->needs_swap)
header->size = bswap_64(header->size);
if (repipe && do_write(STDOUT_FILENO, header, sizeof(*header)) < 0)
return -1;
return 0;
}
static int perf_header__read_pipe(struct perf_session *session)
{
struct perf_header *header = &session->header;
struct perf_pipe_file_header f_header;
if (perf_file_header__read_pipe(&f_header, header,
perf_data_file__fd(session->file),
session->repipe) < 0) {
pr_debug("incompatible file format\n");
return -EINVAL;
}
return 0;
}
static int read_attr(int fd, struct perf_header *ph,
struct perf_file_attr *f_attr)
{
struct perf_event_attr *attr = &f_attr->attr;
size_t sz, left;
size_t our_sz = sizeof(f_attr->attr);
ssize_t ret;
memset(f_attr, 0, sizeof(*f_attr));
/* read minimal guaranteed structure */
ret = readn(fd, attr, PERF_ATTR_SIZE_VER0);
if (ret <= 0) {
pr_debug("cannot read %d bytes of header attr\n",
PERF_ATTR_SIZE_VER0);
return -1;
}
/* on file perf_event_attr size */
sz = attr->size;
if (ph->needs_swap)
sz = bswap_32(sz);
if (sz == 0) {
/* assume ABI0 */
sz = PERF_ATTR_SIZE_VER0;
} else if (sz > our_sz) {
pr_debug("file uses a more recent and unsupported ABI"
" (%zu bytes extra)\n", sz - our_sz);
return -1;
}
/* what we have not yet read and that we know about */
left = sz - PERF_ATTR_SIZE_VER0;
if (left) {
void *ptr = attr;
ptr += PERF_ATTR_SIZE_VER0;
ret = readn(fd, ptr, left);
}
/* read perf_file_section, ids are read in caller */
ret = readn(fd, &f_attr->ids, sizeof(f_attr->ids));
return ret <= 0 ? -1 : 0;
}
static int perf_evsel__prepare_tracepoint_event(struct perf_evsel *evsel,
struct pevent *pevent)
{
struct event_format *event;
char bf[128];
/* already prepared */
if (evsel->tp_format)
return 0;
if (pevent == NULL) {
pr_debug("broken or missing trace data\n");
return -1;
}
event = pevent_find_event(pevent, evsel->attr.config);
if (event == NULL)
return -1;
if (!evsel->name) {
snprintf(bf, sizeof(bf), "%s:%s", event->system, event->name);
evsel->name = strdup(bf);
if (evsel->name == NULL)
return -1;
}
evsel->tp_format = event;
return 0;
}
static int perf_evlist__prepare_tracepoint_events(struct perf_evlist *evlist,
struct pevent *pevent)
{
struct perf_evsel *pos;
evlist__for_each(evlist, pos) {
if (pos->attr.type == PERF_TYPE_TRACEPOINT &&
perf_evsel__prepare_tracepoint_event(pos, pevent))
return -1;
}
return 0;
}
int perf_session__read_header(struct perf_session *session)
{
struct perf_data_file *file = session->file;
struct perf_header *header = &session->header;
struct perf_file_header f_header;
struct perf_file_attr f_attr;
u64 f_id;
int nr_attrs, nr_ids, i, j;
int fd = perf_data_file__fd(file);
session->evlist = perf_evlist__new();
if (session->evlist == NULL)
return -ENOMEM;
session->evlist->env = &header->env;
session->machines.host.env = &header->env;
if (perf_data_file__is_pipe(file))
return perf_header__read_pipe(session);
if (perf_file_header__read(&f_header, header, fd) < 0)
return -EINVAL;
/*
* Sanity check that perf.data was written cleanly; data size is
* initialized to 0 and updated only if the on_exit function is run.
* If data size is still 0 then the file contains only partial
* information. Just warn user and process it as much as it can.
*/
if (f_header.data.size == 0) {
pr_warning("WARNING: The %s file's data size field is 0 which is unexpected.\n"
"Was the 'perf record' command properly terminated?\n",
file->path);
}
nr_attrs = f_header.attrs.size / f_header.attr_size;
lseek(fd, f_header.attrs.offset, SEEK_SET);
for (i = 0; i < nr_attrs; i++) {
struct perf_evsel *evsel;
off_t tmp;
if (read_attr(fd, header, &f_attr) < 0)
goto out_errno;
if (header->needs_swap) {
f_attr.ids.size = bswap_64(f_attr.ids.size);
f_attr.ids.offset = bswap_64(f_attr.ids.offset);
perf_event__attr_swap(&f_attr.attr);
}
tmp = lseek(fd, 0, SEEK_CUR);
evsel = perf_evsel__new(&f_attr.attr);
if (evsel == NULL)
goto out_delete_evlist;
evsel->needs_swap = header->needs_swap;
/*
* Do it before so that if perf_evsel__alloc_id fails, this
* entry gets purged too at perf_evlist__delete().
*/
perf_evlist__add(session->evlist, evsel);
nr_ids = f_attr.ids.size / sizeof(u64);
/*
* We don't have the cpu and thread maps on the header, so
* for allocating the perf_sample_id table we fake 1 cpu and
* hattr->ids threads.
*/
if (perf_evsel__alloc_id(evsel, 1, nr_ids))
goto out_delete_evlist;
lseek(fd, f_attr.ids.offset, SEEK_SET);
for (j = 0; j < nr_ids; j++) {
if (perf_header__getbuffer64(header, fd, &f_id, sizeof(f_id)))
goto out_errno;
perf_evlist__id_add(session->evlist, evsel, 0, j, f_id);
}
lseek(fd, tmp, SEEK_SET);
}
symbol_conf.nr_events = nr_attrs;
perf_header__process_sections(header, fd, &session->tevent,
perf_file_section__process);
if (perf_evlist__prepare_tracepoint_events(session->evlist,
session->tevent.pevent))
goto out_delete_evlist;
return 0;
out_errno:
return -errno;
out_delete_evlist:
perf_evlist__delete(session->evlist);
session->evlist = NULL;
return -ENOMEM;
}
int perf_event__synthesize_attr(struct perf_tool *tool,
struct perf_event_attr *attr, u32 ids, u64 *id,
perf_event__handler_t process)
{
union perf_event *ev;
size_t size;
int err;
size = sizeof(struct perf_event_attr);
size = PERF_ALIGN(size, sizeof(u64));
size += sizeof(struct perf_event_header);
size += ids * sizeof(u64);
ev = malloc(size);
if (ev == NULL)
return -ENOMEM;
ev->attr.attr = *attr;
memcpy(ev->attr.id, id, ids * sizeof(u64));
ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
ev->attr.header.size = (u16)size;
if (ev->attr.header.size == size)
err = process(tool, ev, NULL, NULL);
else
err = -E2BIG;
free(ev);
return err;
}
int perf_event__synthesize_attrs(struct perf_tool *tool,
struct perf_session *session,
perf_event__handler_t process)
{
struct perf_evsel *evsel;
int err = 0;
evlist__for_each(session->evlist, evsel) {
err = perf_event__synthesize_attr(tool, &evsel->attr, evsel->ids,
evsel->id, process);
if (err) {
pr_debug("failed to create perf header attribute\n");
return err;
}
}
return err;
}
int perf_event__process_attr(struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_evlist **pevlist)
{
u32 i, ids, n_ids;
struct perf_evsel *evsel;
struct perf_evlist *evlist = *pevlist;
if (evlist == NULL) {
*pevlist = evlist = perf_evlist__new();
if (evlist == NULL)
return -ENOMEM;
}
evsel = perf_evsel__new(&event->attr.attr);
if (evsel == NULL)
return -ENOMEM;
perf_evlist__add(evlist, evsel);
ids = event->header.size;
ids -= (void *)&event->attr.id - (void *)event;
n_ids = ids / sizeof(u64);
/*
* We don't have the cpu and thread maps on the header, so
* for allocating the perf_sample_id table we fake 1 cpu and
* hattr->ids threads.
*/
if (perf_evsel__alloc_id(evsel, 1, n_ids))
return -ENOMEM;
for (i = 0; i < n_ids; i++) {
perf_evlist__id_add(evlist, evsel, 0, i, event->attr.id[i]);
}
symbol_conf.nr_events = evlist->nr_entries;
return 0;
}
int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd,
struct perf_evlist *evlist,
perf_event__handler_t process)
{
union perf_event ev;
struct tracing_data *tdata;
ssize_t size = 0, aligned_size = 0, padding;
int err __maybe_unused = 0;
/*
* We are going to store the size of the data followed
* by the data contents. Since the fd descriptor is a pipe,
* we cannot seek back to store the size of the data once
* we know it. Instead we:
*
* - write the tracing data to the temp file
* - get/write the data size to pipe
* - write the tracing data from the temp file
* to the pipe
*/
tdata = tracing_data_get(&evlist->entries, fd, true);
if (!tdata)
return -1;
memset(&ev, 0, sizeof(ev));
ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
size = tdata->size;
aligned_size = PERF_ALIGN(size, sizeof(u64));
padding = aligned_size - size;
ev.tracing_data.header.size = sizeof(ev.tracing_data);
ev.tracing_data.size = aligned_size;
process(tool, &ev, NULL, NULL);
/*
* The put function will copy all the tracing data
* stored in temp file to the pipe.
*/
tracing_data_put(tdata);
write_padded(fd, NULL, 0, padding);
return aligned_size;
}
int perf_event__process_tracing_data(struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_session *session)
{
ssize_t size_read, padding, size = event->tracing_data.size;
int fd = perf_data_file__fd(session->file);
off_t offset = lseek(fd, 0, SEEK_CUR);
char buf[BUFSIZ];
/* setup for reading amidst mmap */
lseek(fd, offset + sizeof(struct tracing_data_event),
SEEK_SET);
size_read = trace_report(fd, &session->tevent,
session->repipe);
padding = PERF_ALIGN(size_read, sizeof(u64)) - size_read;
if (readn(fd, buf, padding) < 0) {
pr_err("%s: reading input file", __func__);
return -1;
}
if (session->repipe) {
int retw = write(STDOUT_FILENO, buf, padding);
if (retw <= 0 || retw != padding) {
pr_err("%s: repiping tracing data padding", __func__);
return -1;
}
}
if (size_read + padding != size) {
pr_err("%s: tracing data size mismatch", __func__);
return -1;
}
perf_evlist__prepare_tracepoint_events(session->evlist,
session->tevent.pevent);
return size_read + padding;
}
int perf_event__synthesize_build_id(struct perf_tool *tool,
struct dso *pos, u16 misc,
perf_event__handler_t process,
struct machine *machine)
{
union perf_event ev;
size_t len;
int err = 0;
if (!pos->hit)
return err;
memset(&ev, 0, sizeof(ev));
len = pos->long_name_len + 1;
len = PERF_ALIGN(len, NAME_ALIGN);
memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
ev.build_id.header.misc = misc;
ev.build_id.pid = machine->pid;
ev.build_id.header.size = sizeof(ev.build_id) + len;
memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
err = process(tool, &ev, NULL, machine);
return err;
}
int perf_event__process_build_id(struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_session *session)
{
__event_process_build_id(&event->build_id,
event->build_id.filename,
session);
return 0;
}