![Xiao Guangrong](/assets/img/avatar_default.png)
Setting _FILE_OFFSET_BITS and using O_LARGEFILE, lseek64, etc, is redundant. Thanks H. Peter Anvin for pointing it out. So, this patch removes O_LARGEFILE, lseek64, etc. Suggested-by: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> LKML-Reference: <4B6A8972.3070605@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
768 lines
17 KiB
C
768 lines
17 KiB
C
#define _FILE_OFFSET_BITS 64
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#include <sys/types.h>
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#include <byteswap.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <linux/list.h>
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#include <linux/kernel.h>
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#include "util.h"
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#include "header.h"
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#include "../perf.h"
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#include "trace-event.h"
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#include "session.h"
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#include "symbol.h"
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#include "debug.h"
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/*
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* Create new perf.data header attribute:
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*/
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struct perf_header_attr *perf_header_attr__new(struct perf_event_attr *attr)
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{
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struct perf_header_attr *self = malloc(sizeof(*self));
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if (self != NULL) {
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self->attr = *attr;
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self->ids = 0;
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self->size = 1;
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self->id = malloc(sizeof(u64));
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if (self->id == NULL) {
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free(self);
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self = NULL;
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}
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}
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return self;
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}
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void perf_header_attr__delete(struct perf_header_attr *self)
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{
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free(self->id);
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free(self);
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}
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int perf_header_attr__add_id(struct perf_header_attr *self, u64 id)
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{
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int pos = self->ids;
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self->ids++;
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if (self->ids > self->size) {
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int nsize = self->size * 2;
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u64 *nid = realloc(self->id, nsize * sizeof(u64));
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if (nid == NULL)
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return -1;
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self->size = nsize;
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self->id = nid;
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}
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self->id[pos] = id;
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return 0;
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}
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int perf_header__init(struct perf_header *self)
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{
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self->size = 1;
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self->attr = malloc(sizeof(void *));
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return self->attr == NULL ? -ENOMEM : 0;
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}
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void perf_header__exit(struct perf_header *self)
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{
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int i;
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for (i = 0; i < self->attrs; ++i)
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perf_header_attr__delete(self->attr[i]);
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free(self->attr);
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}
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int perf_header__add_attr(struct perf_header *self,
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struct perf_header_attr *attr)
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{
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if (self->frozen)
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return -1;
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if (self->attrs == self->size) {
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int nsize = self->size * 2;
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struct perf_header_attr **nattr;
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nattr = realloc(self->attr, nsize * sizeof(void *));
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if (nattr == NULL)
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return -1;
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self->size = nsize;
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self->attr = nattr;
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}
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self->attr[self->attrs++] = attr;
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return 0;
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}
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#define MAX_EVENT_NAME 64
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struct perf_trace_event_type {
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u64 event_id;
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char name[MAX_EVENT_NAME];
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};
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static int event_count;
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static struct perf_trace_event_type *events;
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int perf_header__push_event(u64 id, const char *name)
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{
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if (strlen(name) > MAX_EVENT_NAME)
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pr_warning("Event %s will be truncated\n", name);
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if (!events) {
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events = malloc(sizeof(struct perf_trace_event_type));
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if (events == NULL)
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return -ENOMEM;
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} else {
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struct perf_trace_event_type *nevents;
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nevents = realloc(events, (event_count + 1) * sizeof(*events));
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if (nevents == NULL)
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return -ENOMEM;
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events = nevents;
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}
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memset(&events[event_count], 0, sizeof(struct perf_trace_event_type));
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events[event_count].event_id = id;
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strncpy(events[event_count].name, name, MAX_EVENT_NAME - 1);
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event_count++;
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return 0;
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}
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char *perf_header__find_event(u64 id)
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{
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int i;
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for (i = 0 ; i < event_count; i++) {
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if (events[i].event_id == id)
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return events[i].name;
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}
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return NULL;
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}
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static const char *__perf_magic = "PERFFILE";
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#define PERF_MAGIC (*(u64 *)__perf_magic)
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struct perf_file_attr {
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struct perf_event_attr attr;
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struct perf_file_section ids;
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};
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void perf_header__set_feat(struct perf_header *self, int feat)
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{
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set_bit(feat, self->adds_features);
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}
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bool perf_header__has_feat(const struct perf_header *self, int feat)
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{
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return test_bit(feat, self->adds_features);
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}
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static int do_write(int fd, const void *buf, size_t size)
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{
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while (size) {
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int ret = write(fd, buf, size);
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if (ret < 0)
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return -errno;
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size -= ret;
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buf += ret;
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}
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return 0;
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}
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#define NAME_ALIGN 64
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static int write_padded(int fd, const void *bf, size_t count,
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size_t count_aligned)
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{
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static const char zero_buf[NAME_ALIGN];
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int err = do_write(fd, bf, count);
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if (!err)
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err = do_write(fd, zero_buf, count_aligned - count);
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return err;
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}
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#define dsos__for_each_with_build_id(pos, head) \
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list_for_each_entry(pos, head, node) \
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if (!pos->has_build_id) \
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continue; \
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else
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static int __dsos__write_buildid_table(struct list_head *head, u16 misc, int fd)
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{
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struct dso *pos;
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dsos__for_each_with_build_id(pos, head) {
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int err;
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struct build_id_event b;
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size_t len;
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if (!pos->hit)
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continue;
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len = pos->long_name_len + 1;
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len = ALIGN(len, NAME_ALIGN);
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memset(&b, 0, sizeof(b));
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memcpy(&b.build_id, pos->build_id, sizeof(pos->build_id));
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b.header.misc = misc;
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b.header.size = sizeof(b) + len;
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err = do_write(fd, &b, sizeof(b));
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if (err < 0)
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return err;
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err = write_padded(fd, pos->long_name,
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pos->long_name_len + 1, len);
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if (err < 0)
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return err;
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}
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return 0;
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}
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static int dsos__write_buildid_table(int fd)
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{
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int err = __dsos__write_buildid_table(&dsos__kernel,
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PERF_RECORD_MISC_KERNEL, fd);
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if (err == 0)
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err = __dsos__write_buildid_table(&dsos__user,
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PERF_RECORD_MISC_USER, fd);
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return err;
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}
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int build_id_cache__add_s(const char *sbuild_id, const char *debugdir,
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const char *name, bool is_kallsyms)
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{
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const size_t size = PATH_MAX;
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char *filename = malloc(size),
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*linkname = malloc(size), *targetname;
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int len, err = -1;
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if (filename == NULL || linkname == NULL)
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goto out_free;
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len = snprintf(filename, size, "%s%s%s",
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debugdir, is_kallsyms ? "/" : "", name);
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if (mkdir_p(filename, 0755))
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goto out_free;
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snprintf(filename + len, sizeof(filename) - len, "/%s", sbuild_id);
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if (access(filename, F_OK)) {
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if (is_kallsyms) {
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if (copyfile("/proc/kallsyms", filename))
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goto out_free;
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} else if (link(name, filename) && copyfile(name, filename))
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goto out_free;
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}
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len = snprintf(linkname, size, "%s/.build-id/%.2s",
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debugdir, sbuild_id);
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if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
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goto out_free;
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snprintf(linkname + len, size - len, "/%s", sbuild_id + 2);
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targetname = filename + strlen(debugdir) - 5;
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memcpy(targetname, "../..", 5);
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if (symlink(targetname, linkname) == 0)
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err = 0;
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out_free:
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free(filename);
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free(linkname);
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return err;
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}
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static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
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const char *name, const char *debugdir,
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bool is_kallsyms)
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{
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char sbuild_id[BUILD_ID_SIZE * 2 + 1];
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build_id__sprintf(build_id, build_id_size, sbuild_id);
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return build_id_cache__add_s(sbuild_id, debugdir, name, is_kallsyms);
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}
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int build_id_cache__remove_s(const char *sbuild_id, const char *debugdir)
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{
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const size_t size = PATH_MAX;
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char *filename = malloc(size),
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*linkname = malloc(size);
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int err = -1;
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if (filename == NULL || linkname == NULL)
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goto out_free;
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snprintf(linkname, size, "%s/.build-id/%.2s/%s",
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debugdir, sbuild_id, sbuild_id + 2);
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if (access(linkname, F_OK))
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goto out_free;
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if (readlink(linkname, filename, size) < 0)
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goto out_free;
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if (unlink(linkname))
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goto out_free;
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/*
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* Since the link is relative, we must make it absolute:
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*/
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snprintf(linkname, size, "%s/.build-id/%.2s/%s",
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debugdir, sbuild_id, filename);
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if (unlink(linkname))
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goto out_free;
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err = 0;
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out_free:
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free(filename);
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free(linkname);
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return err;
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}
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static int dso__cache_build_id(struct dso *self, const char *debugdir)
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{
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bool is_kallsyms = self->kernel && self->long_name[0] != '/';
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return build_id_cache__add_b(self->build_id, sizeof(self->build_id),
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self->long_name, debugdir, is_kallsyms);
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}
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static int __dsos__cache_build_ids(struct list_head *head, const char *debugdir)
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{
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struct dso *pos;
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int err = 0;
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dsos__for_each_with_build_id(pos, head)
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if (dso__cache_build_id(pos, debugdir))
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err = -1;
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return err;
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}
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static int dsos__cache_build_ids(void)
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{
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int err_kernel, err_user;
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char debugdir[PATH_MAX];
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snprintf(debugdir, sizeof(debugdir), "%s/%s", getenv("HOME"),
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DEBUG_CACHE_DIR);
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if (mkdir(debugdir, 0755) != 0 && errno != EEXIST)
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return -1;
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err_kernel = __dsos__cache_build_ids(&dsos__kernel, debugdir);
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err_user = __dsos__cache_build_ids(&dsos__user, debugdir);
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return err_kernel || err_user ? -1 : 0;
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}
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static int perf_header__adds_write(struct perf_header *self, int fd)
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{
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int nr_sections;
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struct perf_file_section *feat_sec;
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int sec_size;
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u64 sec_start;
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int idx = 0, err;
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if (dsos__read_build_ids(true))
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perf_header__set_feat(self, HEADER_BUILD_ID);
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nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
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if (!nr_sections)
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return 0;
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feat_sec = calloc(sizeof(*feat_sec), nr_sections);
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if (feat_sec == NULL)
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return -ENOMEM;
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sec_size = sizeof(*feat_sec) * nr_sections;
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sec_start = self->data_offset + self->data_size;
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lseek(fd, sec_start + sec_size, SEEK_SET);
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if (perf_header__has_feat(self, HEADER_TRACE_INFO)) {
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struct perf_file_section *trace_sec;
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trace_sec = &feat_sec[idx++];
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/* Write trace info */
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trace_sec->offset = lseek(fd, 0, SEEK_CUR);
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read_tracing_data(fd, attrs, nr_counters);
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trace_sec->size = lseek(fd, 0, SEEK_CUR) - trace_sec->offset;
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}
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if (perf_header__has_feat(self, HEADER_BUILD_ID)) {
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struct perf_file_section *buildid_sec;
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buildid_sec = &feat_sec[idx++];
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/* Write build-ids */
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buildid_sec->offset = lseek(fd, 0, SEEK_CUR);
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err = dsos__write_buildid_table(fd);
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if (err < 0) {
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pr_debug("failed to write buildid table\n");
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goto out_free;
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}
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buildid_sec->size = lseek(fd, 0, SEEK_CUR) -
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buildid_sec->offset;
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dsos__cache_build_ids();
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}
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lseek(fd, sec_start, SEEK_SET);
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err = do_write(fd, feat_sec, sec_size);
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if (err < 0)
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pr_debug("failed to write feature section\n");
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out_free:
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free(feat_sec);
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return err;
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}
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int perf_header__write(struct perf_header *self, int fd, bool at_exit)
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{
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struct perf_file_header f_header;
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struct perf_file_attr f_attr;
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struct perf_header_attr *attr;
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int i, err;
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lseek(fd, sizeof(f_header), SEEK_SET);
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for (i = 0; i < self->attrs; i++) {
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attr = self->attr[i];
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attr->id_offset = lseek(fd, 0, SEEK_CUR);
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err = do_write(fd, attr->id, attr->ids * sizeof(u64));
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if (err < 0) {
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pr_debug("failed to write perf header\n");
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return err;
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}
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}
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self->attr_offset = lseek(fd, 0, SEEK_CUR);
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for (i = 0; i < self->attrs; i++) {
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attr = self->attr[i];
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f_attr = (struct perf_file_attr){
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.attr = attr->attr,
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.ids = {
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.offset = attr->id_offset,
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.size = attr->ids * sizeof(u64),
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}
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};
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err = do_write(fd, &f_attr, sizeof(f_attr));
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if (err < 0) {
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pr_debug("failed to write perf header attribute\n");
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return err;
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}
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}
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self->event_offset = lseek(fd, 0, SEEK_CUR);
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self->event_size = event_count * sizeof(struct perf_trace_event_type);
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if (events) {
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err = do_write(fd, events, self->event_size);
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if (err < 0) {
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pr_debug("failed to write perf header events\n");
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return err;
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}
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}
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self->data_offset = lseek(fd, 0, SEEK_CUR);
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if (at_exit) {
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err = perf_header__adds_write(self, fd);
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if (err < 0)
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return err;
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}
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f_header = (struct perf_file_header){
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.magic = PERF_MAGIC,
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.size = sizeof(f_header),
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.attr_size = sizeof(f_attr),
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.attrs = {
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.offset = self->attr_offset,
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.size = self->attrs * sizeof(f_attr),
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},
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.data = {
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.offset = self->data_offset,
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.size = self->data_size,
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},
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.event_types = {
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.offset = self->event_offset,
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.size = self->event_size,
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},
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};
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memcpy(&f_header.adds_features, &self->adds_features, sizeof(self->adds_features));
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lseek(fd, 0, SEEK_SET);
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err = do_write(fd, &f_header, sizeof(f_header));
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if (err < 0) {
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pr_debug("failed to write perf header\n");
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return err;
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}
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lseek(fd, self->data_offset + self->data_size, SEEK_SET);
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self->frozen = 1;
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return 0;
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}
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static int do_read(int fd, void *buf, size_t size)
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{
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while (size) {
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int ret = read(fd, buf, size);
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if (ret <= 0)
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return -1;
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size -= ret;
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buf += ret;
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}
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return 0;
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}
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static int perf_header__getbuffer64(struct perf_header *self,
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int fd, void *buf, size_t size)
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{
|
|
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;
|
|
}
|