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linux-stable/tools/perf/util/header.c
Adrian Hunter 99fa298453 perf tools: Add AUX area tracing index 
Add an index of AUX area tracing events within a perf.data file.

perf record uses a special user event PERF_RECORD_FINISHED_ROUND to
enable sorting of events in chunks instead of having to sort all events
altogether.

AUX area tracing events contain data that can span back to the very
beginning of the recording period. i.e. they do not obey the rules of
PERF_RECORD_FINISHED_ROUND.

By adding an index, AUX area tracing events can be found in advance and
the PERF_RECORD_FINISHED_ROUND approach works as usual.

The index is recorded with the auxtrace feature in the perf.data file.
A session reads the index but does not process it.  An AUX area decoder
can queue all the AUX area data in advance using
auxtrace_queues__process_index() or otherwise process the index in some
custom manner.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1430404667-10593-3-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2015-05-04 19:48:47 -03:00

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#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"
static u32 header_argc;
static const char **header_argv;
/*
* 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;
}
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;
}
int
perf_header__set_cmdline(int argc, const char **argv)
{
int i;
/*
* If header_argv has already been set, do not override it.
* This allows a command to set the cmdline, parse args and
* then call another builtin function that implements a
* command -- e.g, cmd_kvm calling cmd_record.
*/
if (header_argv)
return 0;
header_argc = (u32)argc;
/* do not include NULL termination */
header_argv = calloc(argc, sizeof(char *));
if (!header_argv)
return -ENOMEM;
/*
* must copy argv contents because it gets moved
* around during option parsing
*/
for (i = 0; i < argc ; i++)
header_argv[i] = argv[i];
return 0;
}
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 i, n;
int 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 = header_argc + 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 < header_argc; i++) {
ret = do_write_string(fd, header_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 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;
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;
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;
}
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;
char *str;
nr = ph->env.nr_cmdline;
str = ph->env.cmdline;
fprintf(fp, "# cmdline : ");
for (i = 0; i < nr; i++) {
fprintf(fp, "%s ", str);
str += strlen(str) + 1;
}
fputc('\n', fp);
}
static void print_cpu_topology(struct perf_header *ph, int fd __maybe_unused,
FILE *fp)
{
int nr, i;
char *str;
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;
}
}
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:
if (events)
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 dsos *dsos;
struct machine *machine;
u16 misc;
struct dso *dso;
enum dso_kernel_type dso_type;
machine = perf_session__findnew_machine(session, bev->pid);
if (!machine)
goto out;
misc = bev->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
switch (misc) {
case PERF_RECORD_MISC_KERNEL:
dso_type = DSO_TYPE_KERNEL;
dsos = &machine->kernel_dsos;
break;
case PERF_RECORD_MISC_GUEST_KERNEL:
dso_type = DSO_TYPE_GUEST_KERNEL;
dsos = &machine->kernel_dsos;
break;
case PERF_RECORD_MISC_USER:
case PERF_RECORD_MISC_GUEST_USER:
dso_type = DSO_TYPE_USER;
dsos = &machine->user_dsos;
break;
default:
goto out;
}
dso = __dsos__findnew(dsos, 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))
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);
}
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_online = 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;
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 __maybe_unused,
struct perf_header *ph, int fd,
void *data __maybe_unused)
{
ssize_t ret;
char *str;
u32 nr, i;
struct strbuf sb;
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;
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);
free(str);
}
ph->env.cmdline = strbuf_detach(&sb, NULL);
return 0;
error:
strbuf_release(&sb);
return -1;
}
static int process_cpu_topology(struct perf_file_section *section __maybe_unused,
struct perf_header *ph, int fd,
void *data __maybe_unused)
{
ssize_t ret;
u32 nr, i;
char *str;
struct strbuf sb;
ret = readn(fd, &nr, sizeof(nr));
if (ret != sizeof(nr))
return -1;
if (ph->needs_swap)
nr = bswap_32(nr);
ph->env.nr_sibling_cores = nr;
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);
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;
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);
free(str);
}
ph->env.sibling_threads = strbuf_detach(&sb, NULL);
return 0;
error:
strbuf_release(&sb);
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);
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;
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;
}
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