WSL2-Linux-Kernel/tools/perf/util/header.c

768 строки
17 KiB
C

#define _FILE_OFFSET_BITS 64
#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 "util.h"
#include "header.h"
#include "../perf.h"
#include "trace-event.h"
#include "session.h"
#include "symbol.h"
#include "debug.h"
/*
* Create new perf.data header attribute:
*/
struct perf_header_attr *perf_header_attr__new(struct perf_event_attr *attr)
{
struct perf_header_attr *self = malloc(sizeof(*self));
if (self != NULL) {
self->attr = *attr;
self->ids = 0;
self->size = 1;
self->id = malloc(sizeof(u64));
if (self->id == NULL) {
free(self);
self = NULL;
}
}
return self;
}
void perf_header_attr__delete(struct perf_header_attr *self)
{
free(self->id);
free(self);
}
int perf_header_attr__add_id(struct perf_header_attr *self, u64 id)
{
int pos = self->ids;
self->ids++;
if (self->ids > self->size) {
int nsize = self->size * 2;
u64 *nid = realloc(self->id, nsize * sizeof(u64));
if (nid == NULL)
return -1;
self->size = nsize;
self->id = nid;
}
self->id[pos] = id;
return 0;
}
int perf_header__init(struct perf_header *self)
{
self->size = 1;
self->attr = malloc(sizeof(void *));
return self->attr == NULL ? -ENOMEM : 0;
}
void perf_header__exit(struct perf_header *self)
{
int i;
for (i = 0; i < self->attrs; ++i)
perf_header_attr__delete(self->attr[i]);
free(self->attr);
}
int perf_header__add_attr(struct perf_header *self,
struct perf_header_attr *attr)
{
if (self->frozen)
return -1;
if (self->attrs == self->size) {
int nsize = self->size * 2;
struct perf_header_attr **nattr;
nattr = realloc(self->attr, nsize * sizeof(void *));
if (nattr == NULL)
return -1;
self->size = nsize;
self->attr = nattr;
}
self->attr[self->attrs++] = attr;
return 0;
}
#define MAX_EVENT_NAME 64
struct perf_trace_event_type {
u64 event_id;
char name[MAX_EVENT_NAME];
};
static int event_count;
static struct perf_trace_event_type *events;
int perf_header__push_event(u64 id, const char *name)
{
if (strlen(name) > MAX_EVENT_NAME)
pr_warning("Event %s will be truncated\n", name);
if (!events) {
events = malloc(sizeof(struct perf_trace_event_type));
if (events == NULL)
return -ENOMEM;
} else {
struct perf_trace_event_type *nevents;
nevents = realloc(events, (event_count + 1) * sizeof(*events));
if (nevents == NULL)
return -ENOMEM;
events = nevents;
}
memset(&events[event_count], 0, sizeof(struct perf_trace_event_type));
events[event_count].event_id = id;
strncpy(events[event_count].name, name, MAX_EVENT_NAME - 1);
event_count++;
return 0;
}
char *perf_header__find_event(u64 id)
{
int i;
for (i = 0 ; i < event_count; i++) {
if (events[i].event_id == id)
return events[i].name;
}
return NULL;
}
static const char *__perf_magic = "PERFFILE";
#define PERF_MAGIC (*(u64 *)__perf_magic)
struct perf_file_attr {
struct perf_event_attr attr;
struct perf_file_section ids;
};
void perf_header__set_feat(struct perf_header *self, int feat)
{
set_bit(feat, self->adds_features);
}
bool perf_header__has_feat(const struct perf_header *self, int feat)
{
return test_bit(feat, self->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;
}
#define NAME_ALIGN 64
static 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 dsos__for_each_with_build_id(pos, head) \
list_for_each_entry(pos, head, node) \
if (!pos->has_build_id) \
continue; \
else
static int __dsos__write_buildid_table(struct list_head *head, u16 misc, int fd)
{
struct dso *pos;
dsos__for_each_with_build_id(pos, head) {
int err;
struct build_id_event b;
size_t len;
if (!pos->hit)
continue;
len = pos->long_name_len + 1;
len = ALIGN(len, NAME_ALIGN);
memset(&b, 0, sizeof(b));
memcpy(&b.build_id, pos->build_id, sizeof(pos->build_id));
b.header.misc = misc;
b.header.size = sizeof(b) + len;
err = do_write(fd, &b, sizeof(b));
if (err < 0)
return err;
err = write_padded(fd, pos->long_name,
pos->long_name_len + 1, len);
if (err < 0)
return err;
}
return 0;
}
static int dsos__write_buildid_table(int fd)
{
int err = __dsos__write_buildid_table(&dsos__kernel,
PERF_RECORD_MISC_KERNEL, fd);
if (err == 0)
err = __dsos__write_buildid_table(&dsos__user,
PERF_RECORD_MISC_USER, fd);
return err;
}
int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
const char *name, bool is_kallsyms)
{
const size_t size = PATH_MAX;
char *filename = malloc(size),
*linkname = malloc(size), *targetname;
int len, err = -1;
if (filename == NULL || linkname == NULL)
goto out_free;
len = snprintf(filename, size, "%s%s%s",
debugdir, is_kallsyms ? "/" : "", name);
if (mkdir_p(filename, 0755))
goto out_free;
snprintf(filename + len, sizeof(filename) - len, "/%s", sbuild_id);
if (access(filename, F_OK)) {
if (is_kallsyms) {
if (copyfile("/proc/kallsyms", filename))
goto out_free;
} else if (link(name, filename) && copyfile(name, filename))
goto out_free;
}
len = snprintf(linkname, size, "%s/.build-id/%.2s",
debugdir, sbuild_id);
if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
goto out_free;
snprintf(linkname + len, size - len, "/%s", sbuild_id + 2);
targetname = filename + strlen(debugdir) - 5;
memcpy(targetname, "../..", 5);
if (symlink(targetname, linkname) == 0)
err = 0;
out_free:
free(filename);
free(linkname);
return err;
}
static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
const char *name, const char *debugdir,
bool is_kallsyms)
{
char sbuild_id[BUILD_ID_SIZE * 2 + 1];
build_id__sprintf(build_id, build_id_size, sbuild_id);
return build_id_cache__add_s(sbuild_id, debugdir, name, is_kallsyms);
}
int build_id_cache__remove_s(const char *sbuild_id, const char *debugdir)
{
const size_t size = PATH_MAX;
char *filename = malloc(size),
*linkname = malloc(size);
int err = -1;
if (filename == NULL || linkname == NULL)
goto out_free;
snprintf(linkname, size, "%s/.build-id/%.2s/%s",
debugdir, sbuild_id, sbuild_id + 2);
if (access(linkname, F_OK))
goto out_free;
if (readlink(linkname, filename, size) < 0)
goto out_free;
if (unlink(linkname))
goto out_free;
/*
* Since the link is relative, we must make it absolute:
*/
snprintf(linkname, size, "%s/.build-id/%.2s/%s",
debugdir, sbuild_id, filename);
if (unlink(linkname))
goto out_free;
err = 0;
out_free:
free(filename);
free(linkname);
return err;
}
static int dso__cache_build_id(struct dso *self, const char *debugdir)
{
bool is_kallsyms = self->kernel && self->long_name[0] != '/';
return build_id_cache__add_b(self->build_id, sizeof(self->build_id),
self->long_name, debugdir, is_kallsyms);
}
static int __dsos__cache_build_ids(struct list_head *head, const char *debugdir)
{
struct dso *pos;
int err = 0;
dsos__for_each_with_build_id(pos, head)
if (dso__cache_build_id(pos, debugdir))
err = -1;
return err;
}
static int dsos__cache_build_ids(void)
{
int err_kernel, err_user;
char debugdir[PATH_MAX];
snprintf(debugdir, sizeof(debugdir), "%s/%s", getenv("HOME"),
DEBUG_CACHE_DIR);
if (mkdir(debugdir, 0755) != 0 && errno != EEXIST)
return -1;
err_kernel = __dsos__cache_build_ids(&dsos__kernel, debugdir);
err_user = __dsos__cache_build_ids(&dsos__user, debugdir);
return err_kernel || err_user ? -1 : 0;
}
static int perf_header__adds_write(struct perf_header *self, int fd)
{
int nr_sections;
struct perf_file_section *feat_sec;
int sec_size;
u64 sec_start;
int idx = 0, err;
if (dsos__read_build_ids(true))
perf_header__set_feat(self, HEADER_BUILD_ID);
nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
if (!nr_sections)
return 0;
feat_sec = calloc(sizeof(*feat_sec), nr_sections);
if (feat_sec == NULL)
return -ENOMEM;
sec_size = sizeof(*feat_sec) * nr_sections;
sec_start = self->data_offset + self->data_size;
lseek(fd, sec_start + sec_size, SEEK_SET);
if (perf_header__has_feat(self, HEADER_TRACE_INFO)) {
struct perf_file_section *trace_sec;
trace_sec = &feat_sec[idx++];
/* Write trace info */
trace_sec->offset = lseek(fd, 0, SEEK_CUR);
read_tracing_data(fd, attrs, nr_counters);
trace_sec->size = lseek(fd, 0, SEEK_CUR) - trace_sec->offset;
}
if (perf_header__has_feat(self, HEADER_BUILD_ID)) {
struct perf_file_section *buildid_sec;
buildid_sec = &feat_sec[idx++];
/* Write build-ids */
buildid_sec->offset = lseek(fd, 0, SEEK_CUR);
err = dsos__write_buildid_table(fd);
if (err < 0) {
pr_debug("failed to write buildid table\n");
goto out_free;
}
buildid_sec->size = lseek(fd, 0, SEEK_CUR) -
buildid_sec->offset;
dsos__cache_build_ids();
}
lseek(fd, sec_start, SEEK_SET);
err = do_write(fd, feat_sec, sec_size);
if (err < 0)
pr_debug("failed to write feature section\n");
out_free:
free(feat_sec);
return err;
}
int perf_header__write(struct perf_header *self, int fd, bool at_exit)
{
struct perf_file_header f_header;
struct perf_file_attr f_attr;
struct perf_header_attr *attr;
int i, err;
lseek(fd, sizeof(f_header), SEEK_SET);
for (i = 0; i < self->attrs; i++) {
attr = self->attr[i];
attr->id_offset = lseek(fd, 0, SEEK_CUR);
err = do_write(fd, attr->id, attr->ids * sizeof(u64));
if (err < 0) {
pr_debug("failed to write perf header\n");
return err;
}
}
self->attr_offset = lseek(fd, 0, SEEK_CUR);
for (i = 0; i < self->attrs; i++) {
attr = self->attr[i];
f_attr = (struct perf_file_attr){
.attr = attr->attr,
.ids = {
.offset = attr->id_offset,
.size = attr->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;
}
}
self->event_offset = lseek(fd, 0, SEEK_CUR);
self->event_size = event_count * sizeof(struct perf_trace_event_type);
if (events) {
err = do_write(fd, events, self->event_size);
if (err < 0) {
pr_debug("failed to write perf header events\n");
return err;
}
}
self->data_offset = lseek(fd, 0, SEEK_CUR);
if (at_exit) {
err = perf_header__adds_write(self, 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 = self->attr_offset,
.size = self->attrs * sizeof(f_attr),
},
.data = {
.offset = self->data_offset,
.size = self->data_size,
},
.event_types = {
.offset = self->event_offset,
.size = self->event_size,
},
};
memcpy(&f_header.adds_features, &self->adds_features, sizeof(self->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, self->data_offset + self->data_size, SEEK_SET);
self->frozen = 1;
return 0;
}
static int do_read(int fd, void *buf, size_t size)
{
while (size) {
int ret = read(fd, buf, size);
if (ret <= 0)
return -1;
size -= ret;
buf += ret;
}
return 0;
}
static int perf_header__getbuffer64(struct perf_header *self,
int fd, void *buf, size_t size)
{
if (do_read(fd, buf, size))
return -1;
if (self->needs_swap)
mem_bswap_64(buf, size);
return 0;
}
int perf_header__process_sections(struct perf_header *self, int fd,
int (*process)(struct perf_file_section *self,
struct perf_header *ph,
int feat, int fd))
{
struct perf_file_section *feat_sec;
int nr_sections;
int sec_size;
int idx = 0;
int err = -1, feat = 1;
nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
if (!nr_sections)
return 0;
feat_sec = calloc(sizeof(*feat_sec), nr_sections);
if (!feat_sec)
return -1;
sec_size = sizeof(*feat_sec) * nr_sections;
lseek(fd, self->data_offset + self->data_size, SEEK_SET);
if (perf_header__getbuffer64(self, fd, feat_sec, sec_size))
goto out_free;
err = 0;
while (idx < nr_sections && feat < HEADER_LAST_FEATURE) {
if (perf_header__has_feat(self, feat)) {
struct perf_file_section *sec = &feat_sec[idx++];
err = process(sec, self, feat, fd);
if (err < 0)
break;
}
++feat;
}
out_free:
free(feat_sec);
return err;
}
int perf_file_header__read(struct perf_file_header *self,
struct perf_header *ph, int fd)
{
lseek(fd, 0, SEEK_SET);
if (do_read(fd, self, sizeof(*self)) ||
memcmp(&self->magic, __perf_magic, sizeof(self->magic)))
return -1;
if (self->attr_size != sizeof(struct perf_file_attr)) {
u64 attr_size = bswap_64(self->attr_size);
if (attr_size != sizeof(struct perf_file_attr))
return -1;
mem_bswap_64(self, offsetof(struct perf_file_header,
adds_features));
ph->needs_swap = true;
}
if (self->size != sizeof(*self)) {
/* Support the previous format */
if (self->size == offsetof(typeof(*self), adds_features))
bitmap_zero(self->adds_features, HEADER_FEAT_BITS);
else
return -1;
}
memcpy(&ph->adds_features, &self->adds_features,
sizeof(ph->adds_features));
/*
* FIXME: hack that assumes that if we need swap the perf.data file
* may be coming from an arch with a different word-size, ergo different
* DEFINE_BITMAP format, investigate more later, but for now its mostly
* safe to assume that we have a build-id section. Trace files probably
* have several other issues in this realm anyway...
*/
if (ph->needs_swap) {
memset(&ph->adds_features, 0, sizeof(ph->adds_features));
perf_header__set_feat(ph, HEADER_BUILD_ID);
}
ph->event_offset = self->event_types.offset;
ph->event_size = self->event_types.size;
ph->data_offset = self->data.offset;
ph->data_size = self->data.size;
return 0;
}
static int perf_file_section__process(struct perf_file_section *self,
struct perf_header *ph,
int feat, int fd)
{
if (lseek(fd, self->offset, SEEK_SET) == (off_t)-1) {
pr_debug("Failed to lseek to %Ld offset for feature %d, "
"continuing...\n", self->offset, feat);
return 0;
}
switch (feat) {
case HEADER_TRACE_INFO:
trace_report(fd);
break;
case HEADER_BUILD_ID:
if (perf_header__read_build_ids(ph, fd, self->offset, self->size))
pr_debug("Failed to read buildids, continuing...\n");
break;
default:
pr_debug("unknown feature %d, continuing...\n", feat);
}
return 0;
}
int perf_header__read(struct perf_header *self, int fd)
{
struct perf_file_header f_header;
struct perf_file_attr f_attr;
u64 f_id;
int nr_attrs, nr_ids, i, j;
if (perf_file_header__read(&f_header, self, fd) < 0) {
pr_debug("incompatible file format\n");
return -EINVAL;
}
nr_attrs = f_header.attrs.size / sizeof(f_attr);
lseek(fd, f_header.attrs.offset, SEEK_SET);
for (i = 0; i < nr_attrs; i++) {
struct perf_header_attr *attr;
off_t tmp;
if (perf_header__getbuffer64(self, fd, &f_attr, sizeof(f_attr)))
goto out_errno;
tmp = lseek(fd, 0, SEEK_CUR);
attr = perf_header_attr__new(&f_attr.attr);
if (attr == NULL)
return -ENOMEM;
nr_ids = f_attr.ids.size / sizeof(u64);
lseek(fd, f_attr.ids.offset, SEEK_SET);
for (j = 0; j < nr_ids; j++) {
if (perf_header__getbuffer64(self, fd, &f_id, sizeof(f_id)))
goto out_errno;
if (perf_header_attr__add_id(attr, f_id) < 0) {
perf_header_attr__delete(attr);
return -ENOMEM;
}
}
if (perf_header__add_attr(self, attr) < 0) {
perf_header_attr__delete(attr);
return -ENOMEM;
}
lseek(fd, tmp, SEEK_SET);
}
if (f_header.event_types.size) {
lseek(fd, f_header.event_types.offset, SEEK_SET);
events = malloc(f_header.event_types.size);
if (events == NULL)
return -ENOMEM;
if (perf_header__getbuffer64(self, fd, events,
f_header.event_types.size))
goto out_errno;
event_count = f_header.event_types.size / sizeof(struct perf_trace_event_type);
}
perf_header__process_sections(self, fd, perf_file_section__process);
lseek(fd, self->data_offset, SEEK_SET);
self->frozen = 1;
return 0;
out_errno:
return -errno;
}
u64 perf_header__sample_type(struct perf_header *header)
{
u64 type = 0;
int i;
for (i = 0; i < header->attrs; i++) {
struct perf_header_attr *attr = header->attr[i];
if (!type)
type = attr->attr.sample_type;
else if (type != attr->attr.sample_type)
die("non matching sample_type");
}
return type;
}
struct perf_event_attr *
perf_header__find_attr(u64 id, struct perf_header *header)
{
int i;
for (i = 0; i < header->attrs; i++) {
struct perf_header_attr *attr = header->attr[i];
int j;
for (j = 0; j < attr->ids; j++) {
if (attr->id[j] == id)
return &attr->attr;
}
}
return NULL;
}