tools/perf/pmu-events/jevents.c

   1 #define  _XOPEN_SOURCE 500      /* needed for nftw() */
   2 #define  _GNU_SOURCE            /* needed for asprintf() */
   3
   4 /* Parse event JSON files */
   5
   6 /*
   7  * Copyright (c) 2014, Intel Corporation
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright notice,
  14  * this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  * notice, this list of conditions and the following disclaimer in the
  18  * documentation and/or other materials provided with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  23  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  24  * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  25  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  26  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  27  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  29  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  31  * OF THE POSSIBILITY OF SUCH DAMAGE.
  32 */
  33
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <errno.h>
  37 #include <string.h>
  38 #include <ctype.h>
  39 #include <unistd.h>
  40 #include <stdarg.h>
  41 #include <libgen.h>
  42 #include <dirent.h>
  43 #include <sys/time.h>                   /* getrlimit */
  44 #include <sys/resource.h>               /* getrlimit */
  45 #include <ftw.h>
  46 #include <sys/stat.h>
  47 #include "jsmn.h"
  48 #include "json.h"
  49 #include "jevents.h"
  50
  51 #ifndef __maybe_unused
  52 #define __maybe_unused                  __attribute__((unused))
  53 #endif
  54
  55 int verbose;
  56 char *prog;
  57
  58 int eprintf(int level, int var, const char *fmt, ...)
  59 {
  60
  61         int ret;
  62         va_list args;
  63
  64         if (var < level)
  65                 return 0;
  66
  67         va_start(args, fmt);
  68
  69         ret = vfprintf(stderr, fmt, args);
  70
  71         va_end(args);
  72
  73         return ret;
  74 }
  75
  76 __attribute__((weak)) char *get_cpu_str(void)
  77 {
  78         return NULL;
  79 }
  80
  81 static void addfield(char *map, char **dst, const char *sep,
  82                      const char *a, jsmntok_t *bt)
  83 {
  84         unsigned int len = strlen(a) + 1 + strlen(sep);
  85         int olen = *dst ? strlen(*dst) : 0;
  86         int blen = bt ? json_len(bt) : 0;
  87         char *out;
  88
  89         out = realloc(*dst, len + olen + blen);
  90         if (!out) {
  91                 /* Don't add field in this case */
  92                 return;
  93         }
  94         *dst = out;
  95
  96         if (!olen)
  97                 *(*dst) = 0;
  98         else
  99                 strcat(*dst, sep);
 100         strcat(*dst, a);
 101         if (bt)
 102                 strncat(*dst, map + bt->start, blen);
 103 }
 104
 105 static void fixname(char *s)
 106 {
 107         for (; *s; s++)
 108                 *s = tolower(*s);
 109 }
 110
 111 static void fixdesc(char *s)
 112 {
 113         char *e = s + strlen(s);
 114
 115         /* Remove trailing dots that look ugly in perf list */
 116         --e;
 117         while (e >= s && isspace(*e))
 118                 --e;
 119         if (*e == '.')
 120                 *e = 0;
 121 }
 122
 123 static struct msrmap {
 124         const char *num;
 125         const char *pname;
 126 } msrmap[] = {
 127         { "0x3F6", "ldlat=" },
 128         { "0x1A6", "offcore_rsp=" },
 129         { "0x1A7", "offcore_rsp=" },
 130         { "0x3F7", "frontend=" },
 131         { NULL, NULL }
 132 };
 133
 134 static struct field {
 135         const char *field;
 136         const char *kernel;
 137 } fields[] = {
 138         { "UMask",      "umask=" },
 139         { "CounterMask", "cmask=" },
 140         { "Invert",     "inv=" },
 141         { "AnyThread",  "any=" },
 142         { "EdgeDetect", "edge=" },
 143         { "SampleAfterValue", "period=" },
 144         { NULL, NULL }
 145 };
 146
 147 static void cut_comma(char *map, jsmntok_t *newval)
 148 {
 149         int i;
 150
 151         /* Cut off everything after comma */
 152         for (i = newval->start; i < newval->end; i++) {
 153                 if (map[i] == ',')
 154                         newval->end = i;
 155         }
 156 }
 157
 158 static int match_field(char *map, jsmntok_t *field, int nz,
 159                        char **event, jsmntok_t *val)
 160 {
 161         struct field *f;
 162         jsmntok_t newval = *val;
 163
 164         for (f = fields; f->field; f++)
 165                 if (json_streq(map, field, f->field) && nz) {
 166                         cut_comma(map, &newval);
 167                         addfield(map, event, ",", f->kernel, &newval);
 168                         return 1;
 169                 }
 170         return 0;
 171 }
 172
 173 static struct msrmap *lookup_msr(char *map, jsmntok_t *val)
 174 {
 175         jsmntok_t newval = *val;
 176         static bool warned;
 177         int i;
 178
 179         cut_comma(map, &newval);
 180         for (i = 0; msrmap[i].num; i++)
 181                 if (json_streq(map, &newval, msrmap[i].num))
 182                         return &msrmap[i];
 183         if (!warned) {
 184                 warned = true;
 185                 pr_err("%s: Unknown MSR in event file %.*s\n", prog,
 186                         json_len(val), map + val->start);
 187         }
 188         return NULL;
 189 }
 190
 191 static struct map {
 192         const char *json;
 193         const char *perf;
 194 } unit_to_pmu[] = {
 195         { "CBO", "uncore_cbox" },
 196         { "QPI LL", "uncore_qpi" },
 197         { "SBO", "uncore_sbox" },
 198         {}
 199 };
 200
 201 static const char *field_to_perf(struct map *table, char *map, jsmntok_t *val)
 202 {
 203         int i;
 204
 205         for (i = 0; table[i].json; i++) {
 206                 if (json_streq(map, val, table[i].json))
 207                         return table[i].perf;
 208         }
 209         return NULL;
 210 }
 211
 212 #define EXPECT(e, t, m) do { if (!(e)) {                        \
 213         jsmntok_t *loc = (t);                                   \
 214         if (!(t)->start && (t) > tokens)                        \
 215                 loc = (t) - 1;                                  \
 216                 pr_err("%s:%d: " m ", got %s\n", fn,            \
 217                         json_line(map, loc),                    \
 218                         json_name(t));                          \
 219         goto out_free;                                          \
 220 } } while (0)
 221
 222 #define TOPIC_DEPTH 256
 223 static char *topic_array[TOPIC_DEPTH];
 224 static int   topic_level;
 225
 226 static char *get_topic(void)
 227 {
 228         char *tp_old, *tp = NULL;
 229         int i;
 230
 231         for (i = 0; i < topic_level + 1; i++) {
 232                 int n;
 233
 234                 tp_old = tp;
 235                 n = asprintf(&tp, "%s%s", tp ?: "", topic_array[i]);
 236                 if (n < 0) {
 237                         pr_info("%s: asprintf() error %s\n", prog);
 238                         return NULL;
 239                 }
 240                 free(tp_old);
 241         }
 242
 243         for (i = 0; i < (int) strlen(tp); i++) {
 244                 char c = tp[i];
 245
 246                 if (c == '-')
 247                         tp[i] = ' ';
 248                 else if (c == '.') {
 249                         tp[i] = '\0';
 250                         break;
 251                 }
 252         }
 253
 254         return tp;
 255 }
 256
 257 static int add_topic(int level, char *bname)
 258 {
 259         char *topic;
 260
 261         level -= 2;
 262
 263         if (level >= TOPIC_DEPTH)
 264                 return -EINVAL;
 265
 266         topic = strdup(bname);
 267         if (!topic) {
 268                 pr_info("%s: strdup() error %s for file %s\n", prog,
 269                                 strerror(errno), bname);
 270                 return -ENOMEM;
 271         }
 272
 273         free(topic_array[topic_level]);
 274         topic_array[topic_level] = topic;
 275         topic_level              = level;
 276         return 0;
 277 }
 278
 279 struct perf_entry_data {
 280         FILE *outfp;
 281         char *topic;
 282 };
 283
 284 static int close_table;
 285
 286 static void print_events_table_prefix(FILE *fp, const char *tblname)
 287 {
 288         fprintf(fp, "struct pmu_event %s[] = {\n", tblname);
 289         close_table = 1;
 290 }
 291
 292 static int print_events_table_entry(void *data, char *name, char *event,
 293                                     char *desc, char *long_desc,
 294                                     char *pmu, char *unit, char *perpkg)
 295 {
 296         struct perf_entry_data *pd = data;
 297         FILE *outfp = pd->outfp;
 298         char *topic = pd->topic;
 299
 300         /*
 301          * TODO: Remove formatting chars after debugging to reduce
 302          *       string lengths.
 303          */
 304         fprintf(outfp, "{\n");
 305
 306         fprintf(outfp, "\t.name = \"%s\",\n", name);
 307         fprintf(outfp, "\t.event = \"%s\",\n", event);
 308         fprintf(outfp, "\t.desc = \"%s\",\n", desc);
 309         fprintf(outfp, "\t.topic = \"%s\",\n", topic);
 310         if (long_desc && long_desc[0])
 311                 fprintf(outfp, "\t.long_desc = \"%s\",\n", long_desc);
 312         if (pmu)
 313                 fprintf(outfp, "\t.pmu = \"%s\",\n", pmu);
 314         if (unit)
 315                 fprintf(outfp, "\t.unit = \"%s\",\n", unit);
 316         if (perpkg)
 317                 fprintf(outfp, "\t.perpkg = \"%s\",\n", perpkg);
 318         fprintf(outfp, "},\n");
 319
 320         return 0;
 321 }
 322
 323 static void print_events_table_suffix(FILE *outfp)
 324 {
 325         fprintf(outfp, "{\n");
 326
 327         fprintf(outfp, "\t.name = 0,\n");
 328         fprintf(outfp, "\t.event = 0,\n");
 329         fprintf(outfp, "\t.desc = 0,\n");
 330
 331         fprintf(outfp, "},\n");
 332         fprintf(outfp, "};\n");
 333         close_table = 0;
 334 }
 335
 336 static struct fixed {
 337         const char *name;
 338         const char *event;
 339 } fixed[] = {
 340         { "inst_retired.any", "event=0xc0" },
 341         { "inst_retired.any_p", "event=0xc0" },
 342         { "cpu_clk_unhalted.ref", "event=0x0,umask=0x03" },
 343         { "cpu_clk_unhalted.thread", "event=0x3c" },
 344         { "cpu_clk_unhalted.thread_any", "event=0x3c,any=1" },
 345         { NULL, NULL},
 346 };
 347
 348 /*
 349  * Handle different fixed counter encodings between JSON and perf.
 350  */
 351 static char *real_event(const char *name, char *event)
 352 {
 353         int i;
 354
 355         for (i = 0; fixed[i].name; i++)
 356                 if (!strcasecmp(name, fixed[i].name))
 357                         return (char *)fixed[i].event;
 358         return event;
 359 }
 360
 361 /* Call func with each event in the json file */
 362 int json_events(const char *fn,
 363           int (*func)(void *data, char *name, char *event, char *desc,
 364                       char *long_desc,
 365                       char *pmu, char *unit, char *perpkg),
 366           void *data)
 367 {
 368         int err = -EIO;
 369         size_t size;
 370         jsmntok_t *tokens, *tok;
 371         int i, j, len;
 372         char *map;
 373         char buf[128];
 374
 375         if (!fn)
 376                 return -ENOENT;
 377
 378         tokens = parse_json(fn, &map, &size, &len);
 379         if (!tokens)
 380                 return -EIO;
 381         EXPECT(tokens->type == JSMN_ARRAY, tokens, "expected top level array");
 382         tok = tokens + 1;
 383         for (i = 0; i < tokens->size; i++) {
 384                 char *event = NULL, *desc = NULL, *name = NULL;
 385                 char *long_desc = NULL;
 386                 char *extra_desc = NULL;
 387                 char *pmu = NULL;
 388                 char *filter = NULL;
 389                 char *perpkg = NULL;
 390                 char *unit = NULL;
 391                 unsigned long long eventcode = 0;
 392                 struct msrmap *msr = NULL;
 393                 jsmntok_t *msrval = NULL;
 394                 jsmntok_t *precise = NULL;
 395                 jsmntok_t *obj = tok++;
 396
 397                 EXPECT(obj->type == JSMN_OBJECT, obj, "expected object");
 398                 for (j = 0; j < obj->size; j += 2) {
 399                         jsmntok_t *field, *val;
 400                         int nz;
 401
 402                         field = tok + j;
 403                         EXPECT(field->type == JSMN_STRING, tok + j,
 404                                "Expected field name");
 405                         val = tok + j + 1;
 406                         EXPECT(val->type == JSMN_STRING, tok + j + 1,
 407                                "Expected string value");
 408
 409                         nz = !json_streq(map, val, "0");
 410                         if (match_field(map, field, nz, &event, val)) {
 411                                 /* ok */
 412                         } else if (json_streq(map, field, "EventCode")) {
 413                                 char *code = NULL;
 414                                 addfield(map, &code, "", "", val);
 415                                 eventcode |= strtoul(code, NULL, 0);
 416                                 free(code);
 417                         } else if (json_streq(map, field, "ExtSel")) {
 418                                 char *code = NULL;
 419                                 addfield(map, &code, "", "", val);
 420                                 eventcode |= strtoul(code, NULL, 0) << 21;
 421                                 free(code);
 422                         } else if (json_streq(map, field, "EventName")) {
 423                                 addfield(map, &name, "", "", val);
 424                         } else if (json_streq(map, field, "BriefDescription")) {
 425                                 addfield(map, &desc, "", "", val);
 426                                 fixdesc(desc);
 427                         } else if (json_streq(map, field,
 428                                              "PublicDescription")) {
 429                                 addfield(map, &long_desc, "", "", val);
 430                                 fixdesc(long_desc);
 431                         } else if (json_streq(map, field, "PEBS") && nz) {
 432                                 precise = val;
 433                         } else if (json_streq(map, field, "MSRIndex") && nz) {
 434                                 msr = lookup_msr(map, val);
 435                         } else if (json_streq(map, field, "MSRValue")) {
 436                                 msrval = val;
 437                         } else if (json_streq(map, field, "Errata") &&
 438                                    !json_streq(map, val, "null")) {
 439                                 addfield(map, &extra_desc, ". ",
 440                                         " Spec update: ", val);
 441                         } else if (json_streq(map, field, "Data_LA") && nz) {
 442                                 addfield(map, &extra_desc, ". ",
 443                                         " Supports address when precise",
 444                                         NULL);
 445                         } else if (json_streq(map, field, "Unit")) {
 446                                 const char *ppmu;
 447                                 char *s;
 448
 449                                 ppmu = field_to_perf(unit_to_pmu, map, val);
 450                                 if (ppmu) {
 451                                         pmu = strdup(ppmu);
 452                                 } else {
 453                                         if (!pmu)
 454                                                 pmu = strdup("uncore_");
 455                                         addfield(map, &pmu, "", "", val);
 456                                         for (s = pmu; *s; s++)
 457                                                 *s = tolower(*s);
 458                                 }
 459                                 addfield(map, &desc, ". ", "Unit: ", NULL);
 460                                 addfield(map, &desc, "", pmu, NULL);
 461                         } else if (json_streq(map, field, "Filter")) {
 462                                 addfield(map, &filter, "", "", val);
 463                         } else if (json_streq(map, field, "ScaleUnit")) {
 464                                 addfield(map, &unit, "", "", val);
 465                         } else if (json_streq(map, field, "PerPkg")) {
 466                                 addfield(map, &perpkg, "", "", val);
 467                         }
 468                         /* ignore unknown fields */
 469                 }
 470                 if (precise && desc && !strstr(desc, "(Precise Event)")) {
 471                         if (json_streq(map, precise, "2"))
 472                                 addfield(map, &extra_desc, " ",
 473                                                 "(Must be precise)", NULL);
 474                         else
 475                                 addfield(map, &extra_desc, " ",
 476                                                 "(Precise event)", NULL);
 477                 }
 478                 snprintf(buf, sizeof buf, "event=%#llx", eventcode);
 479                 addfield(map, &event, ",", buf, NULL);
 480                 if (desc && extra_desc)
 481                         addfield(map, &desc, " ", extra_desc, NULL);
 482                 if (long_desc && extra_desc)
 483                         addfield(map, &long_desc, " ", extra_desc, NULL);
 484                 if (filter)
 485                         addfield(map, &event, ",", filter, NULL);
 486                 if (msr != NULL)
 487                         addfield(map, &event, ",", msr->pname, msrval);
 488                 fixname(name);
 489
 490                 err = func(data, name, real_event(name, event), desc, long_desc,
 491                                 pmu, unit, perpkg);
 492                 free(event);
 493                 free(desc);
 494                 free(name);
 495                 free(long_desc);
 496                 free(extra_desc);
 497                 free(pmu);
 498                 free(filter);
 499                 free(perpkg);
 500                 free(unit);
 501                 if (err)
 502                         break;
 503                 tok += j;
 504         }
 505         EXPECT(tok - tokens == len, tok, "unexpected objects at end");
 506         err = 0;
 507 out_free:
 508         free_json(map, size, tokens);
 509         return err;
 510 }
 511
 512 static char *file_name_to_table_name(char *fname)
 513 {
 514         unsigned int i;
 515         int n;
 516         int c;
 517         char *tblname;
 518
 519         /*
 520          * Ensure tablename starts with alphabetic character.
 521          * Derive rest of table name from basename of the JSON file,
 522          * replacing hyphens and stripping out .json suffix.
 523          */
 524         n = asprintf(&tblname, "pme_%s", basename(fname));
 525         if (n < 0) {
 526                 pr_info("%s: asprintf() error %s for file %s\n", prog,
 527                                 strerror(errno), fname);
 528                 return NULL;
 529         }
 530
 531         for (i = 0; i < strlen(tblname); i++) {
 532                 c = tblname[i];
 533
 534                 if (c == '-')
 535                         tblname[i] = '_';
 536                 else if (c == '.') {
 537                         tblname[i] = '\0';
 538                         break;
 539                 } else if (!isalnum(c) && c != '_') {
 540                         pr_err("%s: Invalid character '%c' in file name %s\n",
 541                                         prog, c, basename(fname));
 542                         free(tblname);
 543                         tblname = NULL;
 544                         break;
 545                 }
 546         }
 547
 548         return tblname;
 549 }
 550
 551 static void print_mapping_table_prefix(FILE *outfp)
 552 {
 553         fprintf(outfp, "struct pmu_events_map pmu_events_map[] = {\n");
 554 }
 555
 556 static void print_mapping_table_suffix(FILE *outfp)
 557 {
 558         /*
 559          * Print the terminating, NULL entry.
 560          */
 561         fprintf(outfp, "{\n");
 562         fprintf(outfp, "\t.cpuid = 0,\n");
 563         fprintf(outfp, "\t.version = 0,\n");
 564         fprintf(outfp, "\t.type = 0,\n");
 565         fprintf(outfp, "\t.table = 0,\n");
 566         fprintf(outfp, "},\n");
 567
 568         /* and finally, the closing curly bracket for the struct */
 569         fprintf(outfp, "};\n");
 570 }
 571
 572 static int process_mapfile(FILE *outfp, char *fpath)
 573 {
 574         int n = 16384;
 575         FILE *mapfp;
 576         char *save = NULL;
 577         char *line, *p;
 578         int line_num;
 579         char *tblname;
 580
 581         pr_info("%s: Processing mapfile %s\n", prog, fpath);
 582
 583         line = malloc(n);
 584         if (!line)
 585                 return -1;
 586
 587         mapfp = fopen(fpath, "r");
 588         if (!mapfp) {
 589                 pr_info("%s: Error %s opening %s\n", prog, strerror(errno),
 590                                 fpath);
 591                 return -1;
 592         }
 593
 594         print_mapping_table_prefix(outfp);
 595
 596         /* Skip first line (header) */
 597         p = fgets(line, n, mapfp);
 598         if (!p)
 599                 goto out;
 600
 601         line_num = 1;
 602         while (1) {
 603                 char *cpuid, *version, *type, *fname;
 604
 605                 line_num++;
 606                 p = fgets(line, n, mapfp);
 607                 if (!p)
 608                         break;
 609
 610                 if (line[0] == '#' || line[0] == '\n')
 611                         continue;
 612
 613                 if (line[strlen(line)-1] != '\n') {
 614                         /* TODO Deal with lines longer than 16K */
 615                         pr_info("%s: Mapfile %s: line %d too long, aborting\n",
 616                                         prog, fpath, line_num);
 617                         return -1;
 618                 }
 619                 line[strlen(line)-1] = '\0';
 620
 621                 cpuid = strtok_r(p, ",", &save);
 622                 version = strtok_r(NULL, ",", &save);
 623                 fname = strtok_r(NULL, ",", &save);
 624                 type = strtok_r(NULL, ",", &save);
 625
 626                 tblname = file_name_to_table_name(fname);
 627                 fprintf(outfp, "{\n");
 628                 fprintf(outfp, "\t.cpuid = \"%s\",\n", cpuid);
 629                 fprintf(outfp, "\t.version = \"%s\",\n", version);
 630                 fprintf(outfp, "\t.type = \"%s\",\n", type);
 631
 632                 /*
 633                  * CHECK: We can't use the type (eg "core") field in the
 634                  * table name. For us to do that, we need to somehow tweak
 635                  * the other caller of file_name_to_table(), process_json()
 636                  * to determine the type. process_json() file has no way
 637                  * of knowing these are "core" events unless file name has
 638                  * core in it. If filename has core in it, we can safely
 639                  * ignore the type field here also.
 640                  */
 641                 fprintf(outfp, "\t.table = %s\n", tblname);
 642                 fprintf(outfp, "},\n");
 643         }
 644
 645 out:
 646         print_mapping_table_suffix(outfp);
 647         return 0;
 648 }
 649
 650 /*
 651  * If we fail to locate/process JSON and map files, create a NULL mapping
 652  * table. This would at least allow perf to build even if we can't find/use
 653  * the aliases.
 654  */
 655 static void create_empty_mapping(const char *output_file)
 656 {
 657         FILE *outfp;
 658
 659         pr_info("%s: Creating empty pmu_events_map[] table\n", prog);
 660
 661         /* Truncate file to clear any partial writes to it */
 662         outfp = fopen(output_file, "w");
 663         if (!outfp) {
 664                 perror("fopen()");
 665                 _Exit(1);
 666         }
 667
 668         fprintf(outfp, "#include \"../../pmu-events/pmu-events.h\"\n");
 669         print_mapping_table_prefix(outfp);
 670         print_mapping_table_suffix(outfp);
 671         fclose(outfp);
 672 }
 673
 674 static int get_maxfds(void)
 675 {
 676         struct rlimit rlim;
 677
 678         if (getrlimit(RLIMIT_NOFILE, &rlim) == 0)
 679                 return min((int)rlim.rlim_max / 2, 512);
 680
 681         return 512;
 682 }
 683
 684 /*
 685  * nftw() doesn't let us pass an argument to the processing function,
 686  * so use a global variables.
 687  */
 688 static FILE *eventsfp;
 689 static char *mapfile;
 690
 691 static int process_one_file(const char *fpath, const struct stat *sb,
 692                             int typeflag, struct FTW *ftwbuf)
 693 {
 694         char *tblname, *bname  = (char *) fpath + ftwbuf->base;
 695         int is_dir  = typeflag == FTW_D;
 696         int is_file = typeflag == FTW_F;
 697         int level   = ftwbuf->level;
 698         int err = 0;
 699
 700         pr_debug("%s %d %7jd %-20s %s\n",
 701                  is_file ? "f" : is_dir ? "d" : "x",
 702                  level, sb->st_size, bname, fpath);
 703
 704         /* base dir */
 705         if (level == 0)
 706                 return 0;
 707
 708         /* model directory, reset topic */
 709         if (level == 1 && is_dir) {
 710                 if (close_table)
 711                         print_events_table_suffix(eventsfp);
 712
 713                 /*
 714                  * Drop file name suffix. Replace hyphens with underscores.
 715                  * Fail if file name contains any alphanum characters besides
 716                  * underscores.
 717                  */
 718                 tblname = file_name_to_table_name(bname);
 719                 if (!tblname) {
 720                         pr_info("%s: Error determining table name for %s\n", prog,
 721                                 bname);
 722                         return -1;
 723                 }
 724
 725                 print_events_table_prefix(eventsfp, tblname);
 726                 return 0;
 727         }
 728
 729         /*
 730          * Save the mapfile name for now. We will process mapfile
 731          * after processing all JSON files (so we can write out the
 732          * mapping table after all PMU events tables).
 733          *
 734          * TODO: Allow for multiple mapfiles? Punt for now.
 735          */
 736         if (level == 1 && is_file) {
 737                 if (!strncmp(bname, "mapfile.csv", 11)) {
 738                         if (mapfile) {
 739                                 pr_info("%s: Many mapfiles? Using %s, ignoring %s\n",
 740                                                 prog, mapfile, fpath);
 741                         } else {
 742                                 mapfile = strdup(fpath);
 743                         }
 744                         return 0;
 745                 }
 746
 747                 pr_info("%s: Ignoring file %s\n", prog, fpath);
 748                 return 0;
 749         }
 750
 751         /*
 752          * If the file name does not have a .json extension,
 753          * ignore it. It could be a readme.txt for instance.
 754          */
 755         if (is_file) {
 756                 char *suffix = bname + strlen(bname) - 5;
 757
 758                 if (strncmp(suffix, ".json", 5)) {
 759                         pr_info("%s: Ignoring file without .json suffix %s\n", prog,
 760                                 fpath);
 761                         return 0;
 762                 }
 763         }
 764
 765         if (level > 1 && add_topic(level, bname))
 766                 return -ENOMEM;
 767
 768         /*
 769          * Assume all other files are JSON files.
 770          *
 771          * If mapfile refers to 'power7_core.json', we create a table
 772          * named 'power7_core'. Any inconsistencies between the mapfile
 773          * and directory tree could result in build failure due to table
 774          * names not being found.
 775          *
 776          * Atleast for now, be strict with processing JSON file names.
 777          * i.e. if JSON file name cannot be mapped to C-style table name,
 778          * fail.
 779          */
 780         if (is_file) {
 781                 struct perf_entry_data data = {
 782                         .topic = get_topic(),
 783                         .outfp = eventsfp,
 784                 };
 785
 786                 err = json_events(fpath, print_events_table_entry, &data);
 787
 788                 free(data.topic);
 789         }
 790
 791         return err;
 792 }
 793
 794 #ifndef PATH_MAX
 795 #define PATH_MAX        4096
 796 #endif
 797
 798 /*
 799  * Starting in directory 'start_dirname', find the "mapfile.csv" and
 800  * the set of JSON files for the architecture 'arch'.
 801  *
 802  * From each JSON file, create a C-style "PMU events table" from the
 803  * JSON file (see struct pmu_event).
 804  *
 805  * From the mapfile, create a mapping between the CPU revisions and
 806  * PMU event tables (see struct pmu_events_map).
 807  *
 808  * Write out the PMU events tables and the mapping table to pmu-event.c.
 809  *
 810  * If unable to process the JSON or arch files, create an empty mapping
 811  * table so we can continue to build/use  perf even if we cannot use the
 812  * PMU event aliases.
 813  */
 814 int main(int argc, char *argv[])
 815 {
 816         int rc;
 817         int maxfds;
 818         char ldirname[PATH_MAX];
 819
 820         const char *arch;
 821         const char *output_file;
 822         const char *start_dirname;
 823
 824         prog = basename(argv[0]);
 825         if (argc < 4) {
 826                 pr_err("Usage: %s <arch> <starting_dir> <output_file>\n", prog);
 827                 return 1;
 828         }
 829
 830         arch = argv[1];
 831         start_dirname = argv[2];
 832         output_file = argv[3];
 833
 834         if (argc > 4)
 835                 verbose = atoi(argv[4]);
 836
 837         eventsfp = fopen(output_file, "w");
 838         if (!eventsfp) {
 839                 pr_err("%s Unable to create required file %s (%s)\n",
 840                                 prog, output_file, strerror(errno));
 841                 return 2;
 842         }
 843
 844         /* Include pmu-events.h first */
 845         fprintf(eventsfp, "#include \"../../pmu-events/pmu-events.h\"\n");
 846
 847         sprintf(ldirname, "%s/%s", start_dirname, arch);
 848
 849         /*
 850          * The mapfile allows multiple CPUids to point to the same JSON file,
 851          * so, not sure if there is a need for symlinks within the pmu-events
 852          * directory.
 853          *
 854          * For now, treat symlinks of JSON files as regular files and create
 855          * separate tables for each symlink (presumably, each symlink refers
 856          * to specific version of the CPU).
 857          */
 858
 859         maxfds = get_maxfds();
 860         mapfile = NULL;
 861         rc = nftw(ldirname, process_one_file, maxfds, 0);
 862         if (rc && verbose) {
 863                 pr_info("%s: Error walking file tree %s\n", prog, ldirname);
 864                 goto empty_map;
 865         } else if (rc) {
 866                 goto empty_map;
 867         }
 868
 869         if (close_table)
 870                 print_events_table_suffix(eventsfp);
 871
 872         if (!mapfile) {
 873                 pr_info("%s: No CPU->JSON mapping?\n", prog);
 874                 goto empty_map;
 875         }
 876
 877         if (process_mapfile(eventsfp, mapfile)) {
 878                 pr_info("%s: Error processing mapfile %s\n", prog, mapfile);
 879                 goto empty_map;
 880         }
 881
 882         return 0;
 883
 884 empty_map:
 885         fclose(eventsfp);
 886         create_empty_mapping(output_file);
 887         return 0;
 888 }