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linux/tools/perf/trace/beauty/perf_event_open.c
Arnaldo Carvalho de Melo 690eda6508 perf trace: Introduce SCA_PERF_ATTR_FROM_USER() to set .from_user = true
Paving the way for the generic BPF BTF based syscall arg augmenter.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Howard Chu <howardchu95@gmail.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2024-09-09 19:23:04 -03:00

95 lines
2.7 KiB
C

// SPDX-License-Identifier: LGPL-2.1
#ifndef PERF_FLAG_FD_NO_GROUP
# define PERF_FLAG_FD_NO_GROUP (1UL << 0)
#endif
#ifndef PERF_FLAG_FD_OUTPUT
# define PERF_FLAG_FD_OUTPUT (1UL << 1)
#endif
#ifndef PERF_FLAG_PID_CGROUP
# define PERF_FLAG_PID_CGROUP (1UL << 2) /* pid=cgroup id, per-cpu mode only */
#endif
#ifndef PERF_FLAG_FD_CLOEXEC
# define PERF_FLAG_FD_CLOEXEC (1UL << 3) /* O_CLOEXEC */
#endif
static size_t syscall_arg__scnprintf_perf_flags(char *bf, size_t size,
struct syscall_arg *arg)
{
bool show_prefix = arg->show_string_prefix;
const char *prefix = "PERF_";
int printed = 0, flags = arg->val;
if (flags == 0)
return 0;
#define P_FLAG(n) \
if (flags & PERF_FLAG_##n) { \
printed += scnprintf(bf + printed, size - printed, "%s%s%s", printed ? "|" : "", show_prefix ? prefix : "", #n); \
flags &= ~PERF_FLAG_##n; \
}
P_FLAG(FD_NO_GROUP);
P_FLAG(FD_OUTPUT);
P_FLAG(PID_CGROUP);
P_FLAG(FD_CLOEXEC);
#undef P_FLAG
if (flags)
printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags);
return printed;
}
#define SCA_PERF_FLAGS syscall_arg__scnprintf_perf_flags
struct attr_fprintf_args {
size_t size, printed;
char *bf;
bool first;
};
static int attr__fprintf(FILE *fp __maybe_unused, const char *name, const char *val, void *priv)
{
struct attr_fprintf_args *args = priv;
size_t printed = scnprintf(args->bf + args->printed , args->size - args->printed, "%s%s: %s", args->first ? "" : ", ", name, val);
args->first = false;
args->printed += printed;
return printed;
}
static size_t perf_event_attr___scnprintf(struct perf_event_attr *attr, char *bf, size_t size, bool show_zeros __maybe_unused)
{
struct attr_fprintf_args args = {
.printed = scnprintf(bf, size, "{ "),
.size = size,
.first = true,
.bf = bf,
};
perf_event_attr__fprintf(stdout, attr, attr__fprintf, &args);
return args.printed + scnprintf(bf + args.printed, size - args.printed, " }");
}
static size_t syscall_arg__scnprintf_augmented_perf_event_attr(struct syscall_arg *arg, char *bf, size_t size)
{
return perf_event_attr___scnprintf((void *)arg->augmented.args->value, bf, size, arg->trace->show_zeros);
}
static size_t syscall_arg__scnprintf_perf_event_attr(char *bf, size_t size, struct syscall_arg *arg)
{
if (arg->augmented.args)
return syscall_arg__scnprintf_augmented_perf_event_attr(arg, bf, size);
return scnprintf(bf, size, "%#lx", arg->val);
}
#define SCA_PERF_ATTR syscall_arg__scnprintf_perf_event_attr
// 'argname' is just documentational at this point, to remove the previous comment with that info
#define SCA_PERF_ATTR_FROM_USER(argname) \
{ .scnprintf = SCA_PERF_ATTR, \
.from_user = true, }