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perf bpf: Make bpf__setup_output_event() return the bpf-output event

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We're calling it to setup that event, and we'll need it later to decide
if the bpf-output event we're handling is the one setup for a specific
purpose, return it using ERR_PTR, etc.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-zhachv7il2n1lopt9aonwhu7@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2018-08-07 16:19:05 -03:00
parent e0b6d2ef32
commit 78e890ea86
3 changed files with 21 additions and 18 deletions
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9
tools/perf/builtin-trace.c
View File

@ -3216,8 +3216,9 @@ int cmd_trace(int argc, const char **argv)
};
bool __maybe_unused max_stack_user_set = true;
bool mmap_pages_user_set = true;
struct perf_evsel *evsel;
const char * const trace_subcommands[] = { "record", NULL };
int err;
int err = -1;
char bf[BUFSIZ];
signal(SIGSEGV, sighandler_dump_stack);
@ -3240,9 +3241,9 @@ int cmd_trace(int argc, const char **argv)
"cgroup monitoring only available in system-wide mode");
}
err = bpf__setup_output_event(trace.evlist, "__augmented_syscalls__");
if (err) {
bpf__strerror_setup_output_event(trace.evlist, err, bf, sizeof(bf));
evsel = bpf__setup_output_event(trace.evlist, "__augmented_syscalls__");
if (IS_ERR(evsel)) {
bpf__strerror_setup_output_event(trace.evlist, PTR_ERR(evsel), bf, sizeof(bf));
pr_err("ERROR: Setup trace syscalls enter failed: %s\n", bf);
goto out;
}

23
tools/perf/util/bpf-loader.c
View File

@ -1535,7 +1535,7 @@ int bpf__apply_obj_config(void)
(strcmp(name, \
bpf_map__name(pos)) == 0))
int bpf__setup_output_event(struct perf_evlist *evlist, const char *name)
struct perf_evsel *bpf__setup_output_event(struct perf_evlist *evlist, const char *name)
{
struct bpf_map_priv *tmpl_priv = NULL;
struct bpf_object *obj, *tmp;
@ -1548,7 +1548,7 @@ int bpf__setup_output_event(struct perf_evlist *evlist, const char *name)
struct bpf_map_priv *priv = bpf_map__priv(map);
if (IS_ERR(priv))
return -BPF_LOADER_ERRNO__INTERNAL;
return ERR_PTR(-BPF_LOADER_ERRNO__INTERNAL);
/*
* No need to check map type: type should have been
@ -1561,20 +1561,20 @@ int bpf__setup_output_event(struct perf_evlist *evlist, const char *name)
}
if (!need_init)
return 0;
return NULL;
if (!tmpl_priv) {
char *event_definition = NULL;
if (asprintf(&event_definition, "bpf-output/no-inherit=1,name=%s/", name) < 0)
return -ENOMEM;
return ERR_PTR(-ENOMEM);
err = parse_events(evlist, event_definition, NULL);
free(event_definition);
if (err) {
pr_debug("ERROR: failed to create the \"%s\" bpf-output event\n", name);
return -err;
return ERR_PTR(-err);
}
evsel = perf_evlist__last(evlist);
@ -1584,37 +1584,38 @@ int bpf__setup_output_event(struct perf_evlist *evlist, const char *name)
struct bpf_map_priv *priv = bpf_map__priv(map);
if (IS_ERR(priv))
return -BPF_LOADER_ERRNO__INTERNAL;
return ERR_PTR(-BPF_LOADER_ERRNO__INTERNAL);
if (priv)
continue;
if (tmpl_priv) {
priv = bpf_map_priv__clone(tmpl_priv);
if (!priv)
return -ENOMEM;
return ERR_PTR(-ENOMEM);
err = bpf_map__set_priv(map, priv, bpf_map_priv__clear);
if (err) {
bpf_map_priv__clear(map, priv);
return err;
return ERR_PTR(err);
}
} else if (evsel) {
struct bpf_map_op *op;
op = bpf_map__add_newop(map, NULL);
if (IS_ERR(op))
return PTR_ERR(op);
return ERR_PTR(PTR_ERR(op));
op->op_type = BPF_MAP_OP_SET_EVSEL;
op->v.evsel = evsel;
}
}
return 0;
return evsel;
}
int bpf__setup_stdout(struct perf_evlist *evlist)
{
return bpf__setup_output_event(evlist, "__bpf_stdout__");
struct perf_evsel *evsel = bpf__setup_output_event(evlist, "__bpf_stdout__");
return IS_ERR(evsel) ? PTR_ERR(evsel) : 0;
}
#define ERRNO_OFFSET(e) ((e) - __BPF_LOADER_ERRNO__START)

7
tools/perf/util/bpf-loader.h
View File

@ -43,6 +43,7 @@ enum bpf_loader_errno {
__BPF_LOADER_ERRNO__END,
};
struct perf_evsel;
struct bpf_object;
struct parse_events_term;
#define PERF_BPF_PROBE_GROUP "perf_bpf_probe"
@ -82,7 +83,7 @@ int bpf__apply_obj_config(void);
int bpf__strerror_apply_obj_config(int err, char *buf, size_t size);
int bpf__setup_stdout(struct perf_evlist *evlist);
int bpf__setup_output_event(struct perf_evlist *evlist, const char *name);
struct perf_evsel *bpf__setup_output_event(struct perf_evlist *evlist, const char *name);
int bpf__strerror_setup_output_event(struct perf_evlist *evlist, int err, char *buf, size_t size);
#else
#include <errno.h>
@ -137,10 +138,10 @@ bpf__setup_stdout(struct perf_evlist *evlist __maybe_unused)
return 0;
}
static inline int
static inline struct perf_evsel *
bpf__setup_output_event(struct perf_evlist *evlist __maybe_unused, const char *name __maybe_unused)
{
return 0;
return NULL;
}
static inline int