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Code Issues Releases Wiki Activity

perf bpf: Stop using deprecated bpf_object__next() API

Browse source 
Libbpf has deprecated the ability to keep track of object list inside
libbpf, it now requires applications to track usage multiple bpf objects
directly. Remove usage of bpf_object__next() API and hoist the tracking
logic to perf.

Signed-off-by: Christy Lee <christylee@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: bpf@vger.kernel.org
Cc: kernel-team@fb.com
Link: https://lore.kernel.org/bpf/20220212073054.1052880-3-andrii@kernel.org
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Christy Lee 2022-02-11 23:30:54 -08:00 committed by Arnaldo Carvalho de Melo
parent 710f6c38bc
commit e8eaadf45b
1 changed files with 79 additions and 19 deletions
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98
tools/perf/util/bpf-loader.c
View file

@ -49,8 +49,52 @@ struct bpf_prog_priv {
int *type_mapping;
};
struct bpf_perf_object {
struct list_head list;
struct bpf_object *obj;
};
static LIST_HEAD(bpf_objects_list);
static struct bpf_perf_object *
bpf_perf_object__next(struct bpf_perf_object *prev)
{
struct bpf_perf_object *next;
if (!prev)
next = list_first_entry(&bpf_objects_list,
struct bpf_perf_object,
list);
else
next = list_next_entry(prev, list);
/* Empty list is noticed here so don't need checking on entry. */
if (&next->list == &bpf_objects_list)
return NULL;
return next;
}
#define bpf_perf_object__for_each(perf_obj, tmp) \
for ((perf_obj) = bpf_perf_object__next(NULL), \
(tmp) = bpf_perf_object__next(perf_obj); \
(perf_obj) != NULL; \
(perf_obj) = (tmp), (tmp) = bpf_perf_object__next(tmp))
static bool libbpf_initialized;
static int bpf_perf_object__add(struct bpf_object *obj)
{
struct bpf_perf_object *perf_obj = zalloc(sizeof(*perf_obj));
if (perf_obj) {
INIT_LIST_HEAD(&perf_obj->list);
perf_obj->obj = obj;
list_add_tail(&perf_obj->list, &bpf_objects_list);
}
return perf_obj ? 0 : -ENOMEM;
}
struct bpf_object *
bpf__prepare_load_buffer(void *obj_buf, size_t obj_buf_sz, const char *name)
{
@ -67,9 +111,21 @@ bpf__prepare_load_buffer(void *obj_buf, size_t obj_buf_sz, const char *name)
return ERR_PTR(-EINVAL);
}
if (bpf_perf_object__add(obj)) {
bpf_object__close(obj);
return ERR_PTR(-ENOMEM);
}
return obj;
}
static void bpf_perf_object__close(struct bpf_perf_object *perf_obj)
{
list_del(&perf_obj->list);
bpf_object__close(perf_obj->obj);
free(perf_obj);
}
struct bpf_object *bpf__prepare_load(const char *filename, bool source)
{
struct bpf_object *obj;
@ -100,24 +156,30 @@ struct bpf_object *bpf__prepare_load(const char *filename, bool source)
llvm__dump_obj(filename, obj_buf, obj_buf_sz);
free(obj_buf);
} else
} else {
obj = bpf_object__open(filename);
}
if (IS_ERR_OR_NULL(obj)) {
pr_debug("bpf: failed to load %s\n", filename);
return obj;
}
if (bpf_perf_object__add(obj)) {
bpf_object__close(obj);
return ERR_PTR(-BPF_LOADER_ERRNO__COMPILE);
}
return obj;
}
void bpf__clear(void)
{
struct bpf_object *obj, *tmp;
struct bpf_perf_object *perf_obj, *tmp;
bpf_object__for_each_safe(obj, tmp) {
bpf__unprobe(obj);
bpf_object__close(obj);
bpf_perf_object__for_each(perf_obj, tmp) {
bpf__unprobe(perf_obj->obj);
bpf_perf_object__close(perf_obj);
}
}
@ -1501,11 +1563,11 @@ apply_obj_config_object(struct bpf_object *obj)
int bpf__apply_obj_config(void)
{
struct bpf_object *obj, *tmp;
struct bpf_perf_object *perf_obj, *tmp;
int err;
bpf_object__for_each_safe(obj, tmp) {
err = apply_obj_config_object(obj);
bpf_perf_object__for_each(perf_obj, tmp) {
err = apply_obj_config_object(perf_obj->obj);
if (err)
return err;
}
@ -1513,26 +1575,24 @@ int bpf__apply_obj_config(void)
return 0;
}
#define bpf__for_each_map(pos, obj, objtmp) \
bpf_object__for_each_safe(obj, objtmp) \
bpf_object__for_each_map(pos, obj)
#define bpf__perf_for_each_map(map, pobj, tmp) \
bpf_perf_object__for_each(pobj, tmp) \
bpf_object__for_each_map(map, pobj->obj)
#define bpf__for_each_map_named(pos, obj, objtmp, name) \
bpf__for_each_map(pos, obj, objtmp) \
if (bpf_map__name(pos) && \
(strcmp(name, \
bpf_map__name(pos)) == 0))
#define bpf__perf_for_each_map_named(map, pobj, pobjtmp, name) \
bpf__perf_for_each_map(map, pobj, pobjtmp) \
if (bpf_map__name(map) && (strcmp(name, bpf_map__name(map)) == 0))
struct evsel *bpf__setup_output_event(struct evlist *evlist, const char *name)
{
struct bpf_map_priv *tmpl_priv = NULL;
struct bpf_object *obj, *tmp;
struct bpf_perf_object *perf_obj, *tmp;
struct evsel *evsel = NULL;
struct bpf_map *map;
int err;
bool need_init = false;
bpf__for_each_map_named(map, obj, tmp, name) {
bpf__perf_for_each_map_named(map, perf_obj, tmp, name) {
struct bpf_map_priv *priv = bpf_map__priv(map);
if (IS_ERR(priv))
@ -1568,7 +1628,7 @@ struct evsel *bpf__setup_output_event(struct evlist *evlist, const char *name)
evsel = evlist__last(evlist);
}
bpf__for_each_map_named(map, obj, tmp, name) {
bpf__perf_for_each_map_named(map, perf_obj, tmp, name) {
struct bpf_map_priv *priv = bpf_map__priv(map);
if (IS_ERR(priv))