tools/perf/util/debug.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* For general debugging purposes */
   3
   4 #include <inttypes.h>
   5 #include <string.h>
   6 #include <stdarg.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <sys/wait.h>
  10 #include <api/debug.h>
  11 #include <linux/kernel.h>
  12 #include <linux/time64.h>
  13 #include <sys/time.h>
  14 #ifdef HAVE_BACKTRACE_SUPPORT
  15 #include <execinfo.h>
  16 #endif
  17 #include "color.h"
  18 #include "event.h"
  19 #include "debug.h"
  20 #include "print_binary.h"
  21 #include "target.h"
  22 #include "trace-event.h"
  23 #include "ui/helpline.h"
  24 #include "ui/ui.h"
  25 #include "util/parse-sublevel-options.h"
  26
  27 #include <linux/ctype.h>
  28
  29 #ifdef HAVE_LIBTRACEEVENT
  30 #include <event-parse.h>
  31 #else
  32 #define LIBTRACEEVENT_VERSION 0
  33 #endif
  34
  35 int verbose;
  36 int debug_kmaps;
  37 int debug_peo_args;
  38 bool dump_trace = false, quiet = false;
  39 int debug_ordered_events;
  40 static int redirect_to_stderr;
  41 int debug_data_convert;
  42 static FILE *_debug_file;
  43 bool debug_display_time;
  44 int debug_type_profile;
  45
  46 FILE *debug_file(void)
  47 {
  48         if (!_debug_file) {
  49                 pr_warning_once("debug_file not set");
  50                 debug_set_file(stderr);
  51         }
  52         return _debug_file;
  53 }
  54
  55 void debug_set_file(FILE *file)
  56 {
  57         _debug_file = file;
  58 }
  59
  60 void debug_set_display_time(bool set)
  61 {
  62         debug_display_time = set;
  63 }
  64
  65 static int fprintf_time(FILE *file)
  66 {
  67         struct timeval tod;
  68         struct tm ltime;
  69         char date[64];
  70
  71         if (!debug_display_time)
  72                 return 0;
  73
  74         if (gettimeofday(&tod, NULL) != 0)
  75                 return 0;
  76
  77         if (localtime_r(&tod.tv_sec, &ltime) == NULL)
  78                 return 0;
  79
  80         strftime(date, sizeof(date),  "%F %H:%M:%S", &ltime);
  81         return fprintf(file, "[%s.%06lu] ", date, (long)tod.tv_usec);
  82 }
  83
  84 int veprintf(int level, int var, const char *fmt, va_list args)
  85 {
  86         int ret = 0;
  87
  88         if (var >= level) {
  89                 if (use_browser >= 1 && !redirect_to_stderr) {
  90                         ui_helpline__vshow(fmt, args);
  91                 } else {
  92                         ret = fprintf_time(debug_file());
  93                         ret += vfprintf(debug_file(), fmt, args);
  94                 }
  95         }
  96
  97         return ret;
  98 }
  99
 100 int eprintf(int level, int var, const char *fmt, ...)
 101 {
 102         va_list args;
 103         int ret;
 104
 105         va_start(args, fmt);
 106         ret = veprintf(level, var, fmt, args);
 107         va_end(args);
 108
 109         return ret;
 110 }
 111
 112 static int veprintf_time(u64 t, const char *fmt, va_list args)
 113 {
 114         int ret = 0;
 115         u64 secs, usecs, nsecs = t;
 116
 117         secs   = nsecs / NSEC_PER_SEC;
 118         nsecs -= secs  * NSEC_PER_SEC;
 119         usecs  = nsecs / NSEC_PER_USEC;
 120
 121         ret = fprintf(debug_file(), "[%13" PRIu64 ".%06" PRIu64 "] ", secs, usecs);
 122         ret += vfprintf(debug_file(), fmt, args);
 123         return ret;
 124 }
 125
 126 int eprintf_time(int level, int var, u64 t, const char *fmt, ...)
 127 {
 128         int ret = 0;
 129         va_list args;
 130
 131         if (var >= level) {
 132                 va_start(args, fmt);
 133                 ret = veprintf_time(t, fmt, args);
 134                 va_end(args);
 135         }
 136
 137         return ret;
 138 }
 139
 140 /*
 141  * Overloading libtraceevent standard info print
 142  * function, display with -v in perf.
 143  */
 144 void pr_stat(const char *fmt, ...)
 145 {
 146         va_list args;
 147
 148         va_start(args, fmt);
 149         veprintf(1, verbose, fmt, args);
 150         va_end(args);
 151         eprintf(1, verbose, "\n");
 152 }
 153
 154 int dump_printf(const char *fmt, ...)
 155 {
 156         va_list args;
 157         int ret = 0;
 158
 159         if (dump_trace) {
 160                 va_start(args, fmt);
 161                 ret = vprintf(fmt, args);
 162                 va_end(args);
 163         }
 164
 165         return ret;
 166 }
 167
 168 static int trace_event_printer(enum binary_printer_ops op,
 169                                unsigned int val, void *extra, FILE *fp)
 170 {
 171         const char *color = PERF_COLOR_BLUE;
 172         union perf_event *event = (union perf_event *)extra;
 173         unsigned char ch = (unsigned char)val;
 174         int printed = 0;
 175
 176         switch (op) {
 177         case BINARY_PRINT_DATA_BEGIN:
 178                 printed += fprintf(fp, ".");
 179                 printed += color_fprintf(fp, color, "\n. ... raw event: size %d bytes\n",
 180                                          event->header.size);
 181                 break;
 182         case BINARY_PRINT_LINE_BEGIN:
 183                 printed += fprintf(fp, ".");
 184                 break;
 185         case BINARY_PRINT_ADDR:
 186                 printed += color_fprintf(fp, color, "  %04x: ", val);
 187                 break;
 188         case BINARY_PRINT_NUM_DATA:
 189                 printed += color_fprintf(fp, color, " %02x", val);
 190                 break;
 191         case BINARY_PRINT_NUM_PAD:
 192                 printed += color_fprintf(fp, color, "   ");
 193                 break;
 194         case BINARY_PRINT_SEP:
 195                 printed += color_fprintf(fp, color, "  ");
 196                 break;
 197         case BINARY_PRINT_CHAR_DATA:
 198                 printed += color_fprintf(fp, color, "%c",
 199                               isprint(ch) && isascii(ch) ? ch : '.');
 200                 break;
 201         case BINARY_PRINT_CHAR_PAD:
 202                 printed += color_fprintf(fp, color, " ");
 203                 break;
 204         case BINARY_PRINT_LINE_END:
 205                 printed += color_fprintf(fp, color, "\n");
 206                 break;
 207         case BINARY_PRINT_DATA_END:
 208                 printed += fprintf(fp, "\n");
 209                 break;
 210         default:
 211                 break;
 212         }
 213
 214         return printed;
 215 }
 216
 217 void trace_event(union perf_event *event)
 218 {
 219         unsigned char *raw_event = (void *)event;
 220
 221         if (!dump_trace)
 222                 return;
 223
 224         print_binary(raw_event, event->header.size, 16,
 225                      trace_event_printer, event);
 226 }
 227
 228 static struct sublevel_option debug_opts[] = {
 229         { .name = "verbose",            .value_ptr = &verbose },
 230         { .name = "ordered-events",     .value_ptr = &debug_ordered_events},
 231         { .name = "stderr",             .value_ptr = &redirect_to_stderr},
 232         { .name = "data-convert",       .value_ptr = &debug_data_convert },
 233         { .name = "perf-event-open",    .value_ptr = &debug_peo_args },
 234         { .name = "kmaps",              .value_ptr = &debug_kmaps },
 235         { .name = "type-profile",       .value_ptr = &debug_type_profile },
 236         { .name = NULL, }
 237 };
 238
 239 int perf_debug_option(const char *str)
 240 {
 241         int ret;
 242
 243         ret = perf_parse_sublevel_options(str, debug_opts);
 244         if (ret)
 245                 return ret;
 246
 247         /* Allow only verbose value in range (0, 10), otherwise set 0. */
 248         verbose = (verbose < 0) || (verbose > 10) ? 0 : verbose;
 249
 250 #if LIBTRACEEVENT_VERSION >= MAKE_LIBTRACEEVENT_VERSION(1, 3, 0)
 251         if (verbose == 1)
 252                 tep_set_loglevel(TEP_LOG_INFO);
 253         else if (verbose == 2)
 254                 tep_set_loglevel(TEP_LOG_DEBUG);
 255         else if (verbose >= 3)
 256                 tep_set_loglevel(TEP_LOG_ALL);
 257 #endif
 258         return 0;
 259 }
 260
 261 int perf_quiet_option(void)
 262 {
 263         struct sublevel_option *opt = &debug_opts[0];
 264
 265         /* disable all debug messages */
 266         while (opt->name) {
 267                 *opt->value_ptr = -1;
 268                 opt++;
 269         }
 270
 271         /* For debug variables that are used as bool types, set to 0. */
 272         redirect_to_stderr = 0;
 273         debug_peo_args = 0;
 274         debug_kmaps = 0;
 275         debug_type_profile = 0;
 276
 277         return 0;
 278 }
 279
 280 #define DEBUG_WRAPPER(__n, __l)                         \
 281 static int pr_ ## __n ## _wrapper(const char *fmt, ...) \
 282 {                                                       \
 283         va_list args;                                   \
 284         int ret;                                        \
 285                                                         \
 286         va_start(args, fmt);                            \
 287         ret = veprintf(__l, verbose, fmt, args);        \
 288         va_end(args);                                   \
 289         return ret;                                     \
 290 }
 291
 292 DEBUG_WRAPPER(warning, 0);
 293 DEBUG_WRAPPER(debug, 1);
 294
 295 void perf_debug_setup(void)
 296 {
 297         debug_set_file(stderr);
 298         libapi_set_print(pr_warning_wrapper, pr_warning_wrapper, pr_debug_wrapper);
 299 }
 300
 301 /* Obtain a backtrace and print it to stdout. */
 302 #ifdef HAVE_BACKTRACE_SUPPORT
 303 void dump_stack(void)
 304 {
 305         void *array[16];
 306         size_t size = backtrace(array, ARRAY_SIZE(array));
 307         char **strings = backtrace_symbols(array, size);
 308         size_t i;
 309
 310         printf("Obtained %zd stack frames.\n", size);
 311
 312         for (i = 0; i < size; i++)
 313                 printf("%s\n", strings[i]);
 314
 315         free(strings);
 316 }
 317 #else
 318 void dump_stack(void) {}
 319 #endif
 320
 321 void sighandler_dump_stack(int sig)
 322 {
 323         psignal(sig, "perf");
 324         dump_stack();
 325         signal(sig, SIG_DFL);
 326         raise(sig);
 327 }