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perf bpf: Generalize bpf__setup_stdout() 

We will use it to set up other bpf-output events, for instance to
generate augmented syscall entry tracepoints with pointer contents.

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-4r7kw0nsyi4vyz6xm1tzx6a3@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2018-08-06 09:53:35 -03:00
parent 5941d856a9
commit 92bbe8d834
2 changed files with 24 additions and 9 deletions
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26
tools/perf/util/bpf-loader.c
View File

@ -1535,10 +1535,7 @@ int bpf__apply_obj_config(void)
(strcmp(name, \
bpf_map__name(pos)) == 0))
#define bpf__for_each_stdout_map(pos, obj, objtmp) \
bpf__for_each_map_named(pos, obj, objtmp, "__bpf_stdout__")
int bpf__setup_stdout(struct perf_evlist *evlist)
int bpf__setup_output_event(struct perf_evlist *evlist, const char *name)
{
struct bpf_map_priv *tmpl_priv = NULL;
struct bpf_object *obj, *tmp;
@ -1547,7 +1544,7 @@ int bpf__setup_stdout(struct perf_evlist *evlist)
int err;
bool need_init = false;
bpf__for_each_stdout_map(map, obj, tmp) {
bpf__for_each_map_named(map, obj, tmp, name) {
struct bpf_map_priv *priv = bpf_map__priv(map);
if (IS_ERR(priv))
@ -1567,17 +1564,23 @@ int bpf__setup_stdout(struct perf_evlist *evlist)
return 0;
if (!tmpl_priv) {
err = parse_events(evlist, "bpf-output/no-inherit=1,name=__bpf_stdout__/",
NULL);
char *event_definition = NULL;
if (asprintf(&event_definition, "bpf-output/no-inherit=1,name=%s/", name) < 0)
return -ENOMEM;
err = parse_events(evlist, event_definition, NULL);
free(event_definition);
if (err) {
pr_debug("ERROR: failed to create bpf-output event\n");
pr_debug("ERROR: failed to create the \"%s\" bpf-output event\n", name);
return -err;
}
evsel = perf_evlist__last(evlist);
}
bpf__for_each_stdout_map(map, obj, tmp) {
bpf__for_each_map_named(map, obj, tmp, name) {
struct bpf_map_priv *priv = bpf_map__priv(map);
if (IS_ERR(priv))
@ -1609,6 +1612,11 @@ int bpf__setup_stdout(struct perf_evlist *evlist)
return 0;
}
int bpf__setup_stdout(struct perf_evlist *evlist)
{
return bpf__setup_output_event(evlist, "__bpf_stdout__");
}
#define ERRNO_OFFSET(e) ((e) - __BPF_LOADER_ERRNO__START)
#define ERRCODE_OFFSET(c) ERRNO_OFFSET(BPF_LOADER_ERRNO__##c)
#define NR_ERRNO (__BPF_LOADER_ERRNO__END - __BPF_LOADER_ERRNO__START)

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

@ -82,6 +82,7 @@ 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);
int bpf__strerror_setup_stdout(struct perf_evlist *evlist, int err,
char *buf, size_t size);
@ -138,6 +139,12 @@ bpf__setup_stdout(struct perf_evlist *evlist __maybe_unused)
return 0;
}
static inline int
bpf__setup_output_event(struct perf_evlist *evlist __maybe_unused, const char *name __maybe_unused)
{
return 0;
}
static inline int
__bpf_strerror(char *buf, size_t size)
{