// SPDX-License-Identifier: GPL-2.0
#include "debug.h"
#include "dsos.h"
#include "dso.h"
#include "util.h"
#include "vdso.h"
#include "namespaces.h"
#include <errno.h>
#include <libgen.h>
#include <stdlib.h>
#include <string.h>
#include <symbol.h> // filename__read_build_id
#include <unistd.h>
void dsos__init(struct dsos *dsos)
{
init_rwsem(&dsos->lock);
dsos->cnt = 0;
dsos->allocated = 0;
dsos->dsos = NULL;
dsos->sorted = true;
}
static void dsos__purge(struct dsos *dsos)
{
down_write(&dsos->lock);
for (unsigned int i = 0; i < dsos->cnt; i++) {
struct dso *dso = dsos->dsos[i];
dso__set_dsos(dso, NULL);
dso__put(dso);
}
zfree(&dsos->dsos);
dsos->cnt = 0;
dsos->allocated = 0;
dsos->sorted = true;
up_write(&dsos->lock);
}
void dsos__exit(struct dsos *dsos)
{
dsos__purge(dsos);
exit_rwsem(&dsos->lock);
}
static int __dsos__for_each_dso(struct dsos *dsos,
int (*cb)(struct dso *dso, void *data),
void *data)
{
for (unsigned int i = 0; i < dsos->cnt; i++) {
struct dso *dso = dsos->dsos[i];
int err;
err = cb(dso, data);
if (err)
return err;
}
return 0;
}
struct dsos__read_build_ids_cb_args {
bool with_hits;
bool have_build_id;
};
static int dsos__read_build_ids_cb(struct dso *dso, void *data)
{
struct dsos__read_build_ids_cb_args *args = data;
struct nscookie nsc;
if (args->with_hits && !dso__hit(dso) && !dso__is_vdso(dso))
return 0;
if (dso__has_build_id(dso)) {
args->have_build_id = true;
return 0;
}
nsinfo__mountns_enter(dso__nsinfo(dso), &nsc);
if (filename__read_build_id(dso__long_name(dso), dso__bid(dso)) > 0) {
args->have_build_id = true;
dso__set_has_build_id(dso);
} else if (errno == ENOENT && dso__nsinfo(dso)) {
char *new_name = dso__filename_with_chroot(dso, dso__long_name(dso));
if (new_name && filename__read_build_id(new_name, dso__bid(dso)) > 0) {
args->have_build_id = true;
dso__set_has_build_id(dso);
}
free(new_name);
}
nsinfo__mountns_exit(&nsc);
return 0;
}
bool dsos__read_build_ids(struct dsos *dsos, bool with_hits)
{
struct dsos__read_build_ids_cb_args args = {
.with_hits = with_hits,
.have_build_id = false,
};
dsos__for_each_dso(dsos, dsos__read_build_ids_cb, &args);
return args.have_build_id;
}
static int __dso__cmp_long_name(const char *long_name, const struct dso_id *id,
const struct dso *b)
{
int rc = strcmp(long_name, dso__long_name(b));
return rc ?: dso_id__cmp(id, dso__id_const(b));
}
static int __dso__cmp_short_name(const char *short_name, const struct dso_id *id,
const struct dso *b)
{
int rc = strcmp(short_name, dso__short_name(b));
return rc ?: dso_id__cmp(id, dso__id_const(b));
}
static int dsos__cmp_long_name_id_short_name(const void *va, const void *vb)
{
const struct dso *a = *((const struct dso **)va);
const struct dso *b = *((const struct dso **)vb);
int rc = strcmp(dso__long_name(a), dso__long_name(b));
if (!rc) {
rc = dso_id__cmp(dso__id_const(a), dso__id_const(b));
if (!rc)
rc = strcmp(dso__short_name(a), dso__short_name(b));
}
return rc;
}
struct dsos__key {
const char *long_name;
const struct dso_id *id;
};
static int dsos__cmp_key_long_name_id(const void *vkey, const void *vdso)
{
const struct dsos__key *key = vkey;
const struct dso *dso = *((const struct dso **)vdso);
return __dso__cmp_long_name(key->long_name, key->id, dso);
}
/*
* Find a matching entry and/or link current entry to RB tree.
* Either one of the dso or name parameter must be non-NULL or the
* function will not work.
*/
static struct dso *__dsos__find_by_longname_id(struct dsos *dsos,
const char *name,
struct dso_id *id,
bool write_locked)
{
struct dsos__key key = {
.long_name = name,
.id = id,
};
struct dso **res;
if (dsos->dsos == NULL)
return NULL;
if (!dsos->sorted) {
if (!write_locked) {
struct dso *dso;
up_read(&dsos->lock);
down_write(&dsos->lock);
dso = __dsos__find_by_longname_id(dsos, name, id,
/*write_locked=*/true);
up_write(&dsos->lock);
down_read(&dsos->lock);
return dso;
}
qsort(dsos->dsos, dsos->cnt, sizeof(struct dso *),
dsos__cmp_long_name_id_short_name);
dsos->sorted = true;
}
res = bsearch(&key, dsos->dsos, dsos->cnt, sizeof(struct dso *),
dsos__cmp_key_long_name_id);
if (!res)
return NULL;
return dso__get(*res);
}
int __dsos__add(struct dsos *dsos, struct dso *dso)
{
if (dsos->cnt == dsos->allocated) {
unsigned int to_allocate = 2;
struct dso **temp;
if (dsos->allocated > 0)
to_allocate = dsos->allocated * 2;
temp = realloc(dsos->dsos, sizeof(struct dso *) * to_allocate);
if (!temp)
return -ENOMEM;
dsos->dsos = temp;
dsos->allocated = to_allocate;
}
if (!dsos->sorted) {
dsos->dsos[dsos->cnt++] = dso__get(dso);
} else {
int low = 0, high = dsos->cnt - 1;
int insert = dsos->cnt; /* Default to inserting at the end. */
while (low <= high) {
int mid = low + (high - low) / 2;
int cmp = dsos__cmp_long_name_id_short_name(&dsos->dsos[mid], &dso);
if (cmp < 0) {
low = mid + 1;
} else {
high = mid - 1;
insert = mid;
}
}
memmove(&dsos->dsos[insert + 1], &dsos->dsos[insert],
(dsos->cnt - insert) * sizeof(struct dso *));
dsos->cnt++;
dsos->dsos[insert] = dso__get(dso);
}
dso__set_dsos(dso, dsos);
return 0;
}
int dsos__add(struct dsos *dsos, struct dso *dso)
{
int ret;
down_write(&dsos->lock);
ret = __dsos__add(dsos, dso);
up_write(&dsos->lock);
return ret;
}
struct dsos__find_id_cb_args {
const char *name;
struct dso_id *id;
struct dso *res;
};
static int dsos__find_id_cb(struct dso *dso, void *data)
{
struct dsos__find_id_cb_args *args = data;
if (__dso__cmp_short_name(args->name, args->id, dso) == 0) {
args->res = dso__get(dso);
return 1;
}
return 0;
}
static struct dso *__dsos__find_id(struct dsos *dsos, const char *name, struct dso_id *id,
bool cmp_short, bool write_locked)
{
struct dso *res;
if (cmp_short) {
struct dsos__find_id_cb_args args = {
.name = name,
.id = id,
.res = NULL,
};
__dsos__for_each_dso(dsos, dsos__find_id_cb, &args);
return args.res;
}
res = __dsos__find_by_longname_id(dsos, name, id, write_locked);
return res;
}
struct dso *dsos__find(struct dsos *dsos, const char *name, bool cmp_short)
{
struct dso *res;
down_read(&dsos->lock);
res = __dsos__find_id(dsos, name, NULL, cmp_short, /*write_locked=*/false);
up_read(&dsos->lock);
return res;
}
static void dso__set_basename(struct dso *dso)
{
char *base, *lname;
int tid;
if (perf_pid_map_tid(dso__long_name(dso), &tid)) {
if (asprintf(&base, "[JIT] tid %d", tid) < 0)
return;
} else {
/*
* basename() may modify path buffer, so we must pass
* a copy.
*/
lname = strdup(dso__long_name(dso));
if (!lname)
return;
/*
* basename() may return a pointer to internal
* storage which is reused in subsequent calls
* so copy the result.
*/
base = strdup(basename(lname));
free(lname);
if (!base)
return;
}
dso__set_short_name(dso, base, true);
}
static struct dso *__dsos__addnew_id(struct dsos *dsos, const char *name, struct dso_id *id)
{
struct dso *dso = dso__new_id(name, id);
if (dso != NULL) {
/*
* The dsos lock is held on entry, so rename the dso before
* adding it to avoid needing to take the dsos lock again to say
* the array isn't sorted.
*/
dso__set_basename(dso);
__dsos__add(dsos, dso);
}
return dso;
}
static struct dso *__dsos__findnew_id(struct dsos *dsos, const char *name, struct dso_id *id)
{
struct dso *dso = __dsos__find_id(dsos, name, id, false, /*write_locked=*/true);
if (dso && dso_id__empty(dso__id(dso)) && !dso_id__empty(id))
__dso__inject_id(dso, id);
return dso ? dso : __dsos__addnew_id(dsos, name, id);
}
struct dso *dsos__findnew_id(struct dsos *dsos, const char *name, struct dso_id *id)
{
struct dso *dso;
down_write(&dsos->lock);
dso = __dsos__findnew_id(dsos, name, id);
up_write(&dsos->lock);
return dso;
}
struct dsos__fprintf_buildid_cb_args {
FILE *fp;
bool (*skip)(struct dso *dso, int parm);
int parm;
size_t ret;
};
static int dsos__fprintf_buildid_cb(struct dso *dso, void *data)
{
struct dsos__fprintf_buildid_cb_args *args = data;
char sbuild_id[SBUILD_ID_SIZE];
if (args->skip && args->skip(dso, args->parm))
return 0;
build_id__sprintf(dso__bid(dso), sbuild_id);
args->ret += fprintf(args->fp, "%-40s %s\n", sbuild_id, dso__long_name(dso));
return 0;
}
size_t dsos__fprintf_buildid(struct dsos *dsos, FILE *fp,
bool (*skip)(struct dso *dso, int parm), int parm)
{
struct dsos__fprintf_buildid_cb_args args = {
.fp = fp,
.skip = skip,
.parm = parm,
.ret = 0,
};
dsos__for_each_dso(dsos, dsos__fprintf_buildid_cb, &args);
return args.ret;
}
struct dsos__fprintf_cb_args {
FILE *fp;
size_t ret;
};
static int dsos__fprintf_cb(struct dso *dso, void *data)
{
struct dsos__fprintf_cb_args *args = data;
args->ret += dso__fprintf(dso, args->fp);
return 0;
}
size_t dsos__fprintf(struct dsos *dsos, FILE *fp)
{
struct dsos__fprintf_cb_args args = {
.fp = fp,
.ret = 0,
};
dsos__for_each_dso(dsos, dsos__fprintf_cb, &args);
return args.ret;
}
static int dsos__hit_all_cb(struct dso *dso, void *data __maybe_unused)
{
dso__set_hit(dso);
return 0;
}
int dsos__hit_all(struct dsos *dsos)
{
return dsos__for_each_dso(dsos, dsos__hit_all_cb, NULL);
}
struct dso *dsos__findnew_module_dso(struct dsos *dsos,
struct machine *machine,
struct kmod_path *m,
const char *filename)
{
struct dso *dso;
down_write(&dsos->lock);
dso = __dsos__find_id(dsos, m->name, NULL, /*cmp_short=*/true, /*write_locked=*/true);
if (dso) {
up_write(&dsos->lock);
return dso;
}
/*
* Failed to find the dso so create it. Change the name before adding it
* to the array, to avoid unnecessary sorts and potential locking
* issues.
*/
dso = dso__new_id(m->name, /*id=*/NULL);
if (!dso) {
up_write(&dsos->lock);
return NULL;
}
dso__set_basename(dso);
dso__set_module_info(dso, m, machine);
dso__set_long_name(dso, strdup(filename), true);
dso__set_kernel(dso, DSO_SPACE__KERNEL);
__dsos__add(dsos, dso);
up_write(&dsos->lock);
return dso;
}
static int dsos__find_kernel_dso_cb(struct dso *dso, void *data)
{
struct dso **res = data;
/*
* The cpumode passed to is_kernel_module is not the cpumode of *this*
* event. If we insist on passing correct cpumode to is_kernel_module,
* we should record the cpumode when we adding this dso to the linked
* list.
*
* However we don't really need passing correct cpumode. We know the
* correct cpumode must be kernel mode (if not, we should not link it
* onto kernel_dsos list).
*
* Therefore, we pass PERF_RECORD_MISC_CPUMODE_UNKNOWN.
* is_kernel_module() treats it as a kernel cpumode.
*/
if (!dso__kernel(dso) ||
is_kernel_module(dso__long_name(dso), PERF_RECORD_MISC_CPUMODE_UNKNOWN))
return 0;
*res = dso__get(dso);
return 1;
}
struct dso *dsos__find_kernel_dso(struct dsos *dsos)
{
struct dso *res = NULL;
dsos__for_each_dso(dsos, dsos__find_kernel_dso_cb, &res);
return res;
}
int dsos__for_each_dso(struct dsos *dsos, int (*cb)(struct dso *dso, void *data), void *data)
{
int err;
down_read(&dsos->lock);
err = __dsos__for_each_dso(dsos, cb, data);
up_read(&dsos->lock);
return err;
}
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