Commit 208b4b4a authored by Mike Galbraith's avatar Mike Galbraith Committed by Ingo Molnar

perf_counter tools: Add infrastructure to support loading of kernel module symbols

Add infrastructure for module path discovery and section load addresses.
Signed-off-by: default avatarMike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <1246514830.13293.44.camel@marge.simson.net>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 9974f496
...@@ -306,6 +306,7 @@ LIB_H += util/strlist.h ...@@ -306,6 +306,7 @@ LIB_H += util/strlist.h
LIB_H += util/run-command.h LIB_H += util/run-command.h
LIB_H += util/sigchain.h LIB_H += util/sigchain.h
LIB_H += util/symbol.h LIB_H += util/symbol.h
LIB_H += util/module.h
LIB_H += util/color.h LIB_H += util/color.h
LIB_OBJS += util/abspath.o LIB_OBJS += util/abspath.o
...@@ -329,6 +330,7 @@ LIB_OBJS += util/usage.o ...@@ -329,6 +330,7 @@ LIB_OBJS += util/usage.o
LIB_OBJS += util/wrapper.o LIB_OBJS += util/wrapper.o
LIB_OBJS += util/sigchain.o LIB_OBJS += util/sigchain.o
LIB_OBJS += util/symbol.o LIB_OBJS += util/symbol.o
LIB_OBJS += util/module.o
LIB_OBJS += util/color.o LIB_OBJS += util/color.o
LIB_OBJS += util/pager.o LIB_OBJS += util/pager.o
LIB_OBJS += util/header.o LIB_OBJS += util/header.o
......
#include "util.h"
#include "../perf.h"
#include "string.h"
#include "module.h"
#include <libelf.h>
#include <gelf.h>
#include <elf.h>
#include <dirent.h>
#include <sys/utsname.h>
static unsigned int crc32(const char *p, unsigned int len)
{
int i;
unsigned int crc = 0;
while (len--) {
crc ^= *p++;
for (i = 0; i < 8; i++)
crc = (crc >> 1) ^ ((crc & 1) ? 0xedb88320 : 0);
}
return crc;
}
/* module section methods */
struct sec_dso *sec_dso__new_dso(const char *name)
{
struct sec_dso *self = malloc(sizeof(*self) + strlen(name) + 1);
if (self != NULL) {
strcpy(self->name, name);
self->secs = RB_ROOT;
self->find_section = sec_dso__find_section;
}
return self;
}
static void sec_dso__delete_section(struct section *self)
{
free(((void *)self));
}
void sec_dso__delete_sections(struct sec_dso *self)
{
struct section *pos;
struct rb_node *next = rb_first(&self->secs);
while (next) {
pos = rb_entry(next, struct section, rb_node);
next = rb_next(&pos->rb_node);
rb_erase(&pos->rb_node, &self->secs);
sec_dso__delete_section(pos);
}
}
void sec_dso__delete_self(struct sec_dso *self)
{
sec_dso__delete_sections(self);
free(self);
}
static void sec_dso__insert_section(struct sec_dso *self, struct section *sec)
{
struct rb_node **p = &self->secs.rb_node;
struct rb_node *parent = NULL;
const u64 hash = sec->hash;
struct section *s;
while (*p != NULL) {
parent = *p;
s = rb_entry(parent, struct section, rb_node);
if (hash < s->hash)
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
}
rb_link_node(&sec->rb_node, parent, p);
rb_insert_color(&sec->rb_node, &self->secs);
}
struct section *sec_dso__find_section(struct sec_dso *self, const char *name)
{
struct rb_node *n;
u64 hash;
int len;
if (self == NULL)
return NULL;
len = strlen(name);
hash = crc32(name, len);
n = self->secs.rb_node;
while (n) {
struct section *s = rb_entry(n, struct section, rb_node);
if (hash < s->hash)
n = n->rb_left;
else if (hash > s->hash)
n = n->rb_right;
else {
if (!strcmp(name, s->name))
return s;
else
n = rb_next(&s->rb_node);
}
}
return NULL;
}
static size_t sec_dso__fprintf_section(struct section *self, FILE *fp)
{
return fprintf(fp, "name:%s vma:%llx path:%s\n",
self->name, self->vma, self->path);
}
size_t sec_dso__fprintf(struct sec_dso *self, FILE *fp)
{
size_t ret = fprintf(fp, "dso: %s\n", self->name);
struct rb_node *nd;
for (nd = rb_first(&self->secs); nd; nd = rb_next(nd)) {
struct section *pos = rb_entry(nd, struct section, rb_node);
ret += sec_dso__fprintf_section(pos, fp);
}
return ret;
}
static struct section *section__new(const char *name, const char *path)
{
struct section *self = calloc(1, sizeof(*self));
if (!self)
goto out_failure;
self->name = calloc(1, strlen(name) + 1);
if (!self->name)
goto out_failure;
self->path = calloc(1, strlen(path) + 1);
if (!self->path)
goto out_failure;
strcpy(self->name, name);
strcpy(self->path, path);
self->hash = crc32(self->name, strlen(name));
return self;
out_failure:
if (self) {
if (self->name)
free(self->name);
if (self->path)
free(self->path);
free(self);
}
return NULL;
}
/* module methods */
struct mod_dso *mod_dso__new_dso(const char *name)
{
struct mod_dso *self = malloc(sizeof(*self) + strlen(name) + 1);
if (self != NULL) {
strcpy(self->name, name);
self->mods = RB_ROOT;
self->find_module = mod_dso__find_module;
}
return self;
}
static void mod_dso__delete_module(struct module *self)
{
free(((void *)self));
}
void mod_dso__delete_modules(struct mod_dso *self)
{
struct module *pos;
struct rb_node *next = rb_first(&self->mods);
while (next) {
pos = rb_entry(next, struct module, rb_node);
next = rb_next(&pos->rb_node);
rb_erase(&pos->rb_node, &self->mods);
mod_dso__delete_module(pos);
}
}
void mod_dso__delete_self(struct mod_dso *self)
{
mod_dso__delete_modules(self);
free(self);
}
static void mod_dso__insert_module(struct mod_dso *self, struct module *mod)
{
struct rb_node **p = &self->mods.rb_node;
struct rb_node *parent = NULL;
const u64 hash = mod->hash;
struct module *m;
while (*p != NULL) {
parent = *p;
m = rb_entry(parent, struct module, rb_node);
if (hash < m->hash)
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
}
rb_link_node(&mod->rb_node, parent, p);
rb_insert_color(&mod->rb_node, &self->mods);
}
struct module *mod_dso__find_module(struct mod_dso *self, const char *name)
{
struct rb_node *n;
u64 hash;
int len;
if (self == NULL)
return NULL;
len = strlen(name);
hash = crc32(name, len);
n = self->mods.rb_node;
while (n) {
struct module *m = rb_entry(n, struct module, rb_node);
if (hash < m->hash)
n = n->rb_left;
else if (hash > m->hash)
n = n->rb_right;
else {
if (!strcmp(name, m->name))
return m;
else
n = rb_next(&m->rb_node);
}
}
return NULL;
}
static size_t mod_dso__fprintf_module(struct module *self, FILE *fp)
{
return fprintf(fp, "name:%s path:%s\n", self->name, self->path);
}
size_t mod_dso__fprintf(struct mod_dso *self, FILE *fp)
{
struct rb_node *nd;
size_t ret;
ret = fprintf(fp, "dso: %s\n", self->name);
for (nd = rb_first(&self->mods); nd; nd = rb_next(nd)) {
struct module *pos = rb_entry(nd, struct module, rb_node);
ret += mod_dso__fprintf_module(pos, fp);
}
return ret;
}
static struct module *module__new(const char *name, const char *path)
{
struct module *self = calloc(1, sizeof(*self));
if (!self)
goto out_failure;
self->name = calloc(1, strlen(name) + 1);
if (!self->name)
goto out_failure;
self->path = calloc(1, strlen(path) + 1);
if (!self->path)
goto out_failure;
strcpy(self->name, name);
strcpy(self->path, path);
self->hash = crc32(self->name, strlen(name));
return self;
out_failure:
if (self) {
if (self->name)
free(self->name);
if (self->path)
free(self->path);
free(self);
}
return NULL;
}
static int mod_dso__load_sections(struct module *mod)
{
int count = 0, path_len;
struct dirent *entry;
char *line = NULL;
char *dir_path;
DIR *dir;
size_t n;
path_len = strlen("/sys/module/");
path_len += strlen(mod->name);
path_len += strlen("/sections/");
dir_path = calloc(1, path_len + 1);
if (dir_path == NULL)
goto out_failure;
strcat(dir_path, "/sys/module/");
strcat(dir_path, mod->name);
strcat(dir_path, "/sections/");
dir = opendir(dir_path);
if (dir == NULL)
goto out_free;
while ((entry = readdir(dir))) {
struct section *section;
char *path, *vma;
int line_len;
FILE *file;
if (!strcmp(".", entry->d_name) || !strcmp("..", entry->d_name))
continue;
path = calloc(1, path_len + strlen(entry->d_name) + 1);
if (path == NULL)
break;
strcat(path, dir_path);
strcat(path, entry->d_name);
file = fopen(path, "r");
if (file == NULL) {
free(path);
break;
}
line_len = getline(&line, &n, file);
if (line_len < 0) {
free(path);
fclose(file);
break;
}
if (!line) {
free(path);
fclose(file);
break;
}
line[--line_len] = '\0'; /* \n */
vma = strstr(line, "0x");
if (!vma) {
free(path);
fclose(file);
break;
}
vma += 2;
section = section__new(entry->d_name, path);
if (!section) {
fprintf(stderr, "load_sections: allocation error\n");
free(path);
fclose(file);
break;
}
hex2u64(vma, &section->vma);
sec_dso__insert_section(mod->sections, section);
free(path);
fclose(file);
count++;
}
closedir(dir);
free(line);
free(dir_path);
return count;
out_free:
free(dir_path);
out_failure:
return count;
}
static int mod_dso__load_module_paths(struct mod_dso *self)
{
struct utsname uts;
int count = 0, len;
char *line = NULL;
FILE *file;
char *path;
size_t n;
if (uname(&uts) < 0)
goto out_failure;
len = strlen("/lib/modules/");
len += strlen(uts.release);
len += strlen("/modules.dep");
path = calloc(1, len);
if (path == NULL)
goto out_failure;
strcat(path, "/lib/modules/");
strcat(path, uts.release);
strcat(path, "/modules.dep");
file = fopen(path, "r");
free(path);
if (file == NULL)
goto out_failure;
while (!feof(file)) {
char *path, *name, *tmp;
struct module *module;
int line_len, len;
line_len = getline(&line, &n, file);
if (line_len < 0)
break;
if (!line)
goto out_failure;
line[--line_len] = '\0'; /* \n */
path = strtok(line, ":");
if (!path)
goto out_failure;
name = strdup(path);
name = strtok(name, "/");
tmp = name;
while (tmp) {
tmp = strtok(NULL, "/");
if (tmp)
name = tmp;
}
name = strsep(&name, ".");
/* Quirk: replace '-' with '_' in sound modules */
for (len = strlen(name); len; len--) {
if (*(name+len) == '-')
*(name+len) = '_';
}
module = module__new(name, path);
if (!module) {
fprintf(stderr, "load_module_paths: allocation error\n");
goto out_failure;
}
mod_dso__insert_module(self, module);
module->sections = sec_dso__new_dso("sections");
if (!module->sections) {
fprintf(stderr, "load_module_paths: allocation error\n");
goto out_failure;
}
module->active = mod_dso__load_sections(module);
if (module->active > 0)
count++;
}
free(line);
fclose(file);
return count;
out_failure:
return -1;
}
int mod_dso__load_modules(struct mod_dso *dso)
{
int err;
err = mod_dso__load_module_paths(dso);
return err;
}
#ifndef _PERF_MODULE_
#define _PERF_MODULE_ 1
#include <linux/types.h>
#include "../types.h"
#include <linux/list.h>
#include <linux/rbtree.h>
struct section {
struct rb_node rb_node;
u64 hash;
u64 vma;
char *name;
char *path;
};
struct sec_dso {
struct list_head node;
struct rb_root secs;
struct section *(*find_section)(struct sec_dso *, const char *name);
char name[0];
};
struct module {
struct rb_node rb_node;
u64 hash;
char *name;
char *path;
struct sec_dso *sections;
int active;
};
struct mod_dso {
struct list_head node;
struct rb_root mods;
struct module *(*find_module)(struct mod_dso *, const char *name);
char name[0];
};
struct sec_dso *sec_dso__new_dso(const char *name);
void sec_dso__delete_sections(struct sec_dso *self);
void sec_dso__delete_self(struct sec_dso *self);
size_t sec_dso__fprintf(struct sec_dso *self, FILE *fp);
struct section *sec_dso__find_section(struct sec_dso *self, const char *name);
struct mod_dso *mod_dso__new_dso(const char *name);
void mod_dso__delete_modules(struct mod_dso *self);
void mod_dso__delete_self(struct mod_dso *self);
size_t mod_dso__fprintf(struct mod_dso *self, FILE *fp);
struct module *mod_dso__find_module(struct mod_dso *self, const char *name);
int mod_dso__load_modules(struct mod_dso *dso);
#endif /* _PERF_MODULE_ */
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