tools/perf/trace/beauty/perf_event_open.c

   1 // SPDX-License-Identifier: LGPL-2.1
   2 #ifndef PERF_FLAG_FD_NO_GROUP
   3 # define PERF_FLAG_FD_NO_GROUP          (1UL << 0)
   4 #endif
   5
   6 #ifndef PERF_FLAG_FD_OUTPUT
   7 # define PERF_FLAG_FD_OUTPUT            (1UL << 1)
   8 #endif
   9
  10 #ifndef PERF_FLAG_PID_CGROUP
  11 # define PERF_FLAG_PID_CGROUP           (1UL << 2) /* pid=cgroup id, per-cpu mode only */
  12 #endif
  13
  14 #ifndef PERF_FLAG_FD_CLOEXEC
  15 # define PERF_FLAG_FD_CLOEXEC           (1UL << 3) /* O_CLOEXEC */
  16 #endif
  17
  18 static size_t syscall_arg__scnprintf_perf_flags(char *bf, size_t size,
  19                                                 struct syscall_arg *arg)
  20 {
  21         bool show_prefix = arg->show_string_prefix;
  22         const char *prefix = "PERF_";
  23         int printed = 0, flags = arg->val;
  24
  25         if (flags == 0)
  26                 return 0;
  27
  28 #define P_FLAG(n) \
  29         if (flags & PERF_FLAG_##n) { \
  30                 printed += scnprintf(bf + printed, size - printed, "%s%s%s", printed ? "|" : "", show_prefix ? prefix : "", #n); \
  31                 flags &= ~PERF_FLAG_##n; \
  32         }
  33
  34         P_FLAG(FD_NO_GROUP);
  35         P_FLAG(FD_OUTPUT);
  36         P_FLAG(PID_CGROUP);
  37         P_FLAG(FD_CLOEXEC);
  38 #undef P_FLAG
  39
  40         if (flags)
  41                 printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags);
  42
  43         return printed;
  44 }
  45
  46 #define SCA_PERF_FLAGS syscall_arg__scnprintf_perf_flags
  47
  48 struct attr_fprintf_args {
  49         size_t size, printed;
  50         char *bf;
  51         bool first;
  52 };
  53
  54 static int attr__fprintf(FILE *fp __maybe_unused, const char *name, const char *val, void *priv)
  55 {
  56         struct attr_fprintf_args *args = priv;
  57         size_t printed = scnprintf(args->bf + args->printed , args->size - args->printed, "%s%s: %s", args->first ? "" : ", ", name, val);
  58
  59         args->first = false;
  60         args->printed += printed;
  61         return printed;
  62 }
  63
  64 static size_t perf_event_attr___scnprintf(struct perf_event_attr *attr, char *bf, size_t size, bool show_zeros __maybe_unused)
  65 {
  66         struct attr_fprintf_args args = {
  67                 .printed = scnprintf(bf, size, "{ "),
  68                 .size    = size,
  69                 .first   = true,
  70                 .bf      = bf,
  71         };
  72
  73         perf_event_attr__fprintf(stdout, attr, attr__fprintf, &args);
  74         return args.printed + scnprintf(bf + args.printed, size - args.printed, " }");
  75 }
  76
  77 static size_t syscall_arg__scnprintf_augmented_perf_event_attr(struct syscall_arg *arg, char *bf, size_t size)
  78 {
  79         return perf_event_attr___scnprintf((void *)arg->augmented.args->value, bf, size, arg->trace->show_zeros);
  80 }
  81
  82 static size_t syscall_arg__scnprintf_perf_event_attr(char *bf, size_t size, struct syscall_arg *arg)
  83 {
  84         if (arg->augmented.args)
  85                 return syscall_arg__scnprintf_augmented_perf_event_attr(arg, bf, size);
  86
  87         return scnprintf(bf, size, "%#lx", arg->val);
  88 }
  89
  90 #define SCA_PERF_ATTR syscall_arg__scnprintf_perf_event_attr
  91 // 'argname' is just documentational at this point, to remove the previous comment with that info
  92 #define SCA_PERF_ATTR_FROM_USER(argname) \
  93           { .scnprintf  = SCA_PERF_ATTR, \
  94             .from_user  = true, }