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 int verbose;
  52 char *prog;
  53
  54 int eprintf(int level, int var, const char *fmt, ...)
  55 {
  56
  57         int ret;
  58         va_list args;
  59
  60         if (var < level)
  61                 return 0;
  62
  63         va_start(args, fmt);
  64
  65         ret = vfprintf(stderr, fmt, args);
  66
  67         va_end(args);
  68
  69         return ret;
  70 }
  71
  72 __attribute__((weak)) char *get_cpu_str(void)
  73 {
  74         return NULL;
  75 }
  76
  77 static void addfield(char *map, char **dst, const char *sep,
  78                      const char *a, jsmntok_t *bt)
  79 {
  80         unsigned int len = strlen(a) + 1 + strlen(sep);
  81         int olen = *dst ? strlen(*dst) : 0;
  82         int blen = bt ? json_len(bt) : 0;
  83         char *out;
  84
  85         out = realloc(*dst, len + olen + blen);
  86         if (!out) {
  87                 /* Don't add field in this case */
  88                 return;
  89         }
  90         *dst = out;
  91
  92         if (!olen)
  93                 *(*dst) = 0;
  94         else
  95                 strcat(*dst, sep);
  96         strcat(*dst, a);
  97         if (bt)
  98                 strncat(*dst, map + bt->start, blen);
  99 }
 100
 101 static void fixname(char *s)
 102 {
 103         for (; *s; s++)
 104                 *s = tolower(*s);
 105 }
 106
 107 static void fixdesc(char *s)
 108 {
 109         char *e = s + strlen(s);
 110
 111         /* Remove trailing dots that look ugly in perf list */
 112         --e;
 113         while (e >= s && isspace(*e))
 114                 --e;
 115         if (*e == '.')
 116                 *e = 0;
 117 }
 118
 119 /* Add escapes for '\' so they are proper C strings. */
 120 static char *fixregex(char *s)
 121 {
 122         int len = 0;
 123         int esc_count = 0;
 124         char *fixed = NULL;
 125         char *p, *q;
 126
 127         /* Count the number of '\' in string */
 128         for (p = s; *p; p++) {
 129                 ++len;
 130                 if (*p == '\\')
 131                         ++esc_count;
 132         }
 133
 134         if (esc_count == 0)
 135                 return s;
 136
 137         /* allocate space for a new string */
 138         fixed = (char *) malloc(len + 1);
 139         if (!fixed)
 140                 return NULL;
 141
 142         /* copy over the characters */
 143         q = fixed;
 144         for (p = s; *p; p++) {
 145                 if (*p == '\\') {
 146                         *q = '\\';
 147                         ++q;
 148                 }
 149                 *q = *p;
 150                 ++q;
 151         }
 152         *q = '\0';
 153         return fixed;
 154 }
 155
 156 static struct msrmap {
 157         const char *num;
 158         const char *pname;
 159 } msrmap[] = {
 160         { "0x3F6", "ldlat=" },
 161         { "0x1A6", "offcore_rsp=" },
 162         { "0x1A7", "offcore_rsp=" },
 163         { "0x3F7", "frontend=" },
 164         { NULL, NULL }
 165 };
 166
 167 static struct field {
 168         const char *field;
 169         const char *kernel;
 170 } fields[] = {
 171         { "UMask",      "umask=" },
 172         { "CounterMask", "cmask=" },
 173         { "Invert",     "inv=" },
 174         { "AnyThread",  "any=" },
 175         { "EdgeDetect", "edge=" },
 176         { "SampleAfterValue", "period=" },
 177         { "FCMask",     "fc_mask=" },
 178         { "PortMask",   "ch_mask=" },
 179         { NULL, NULL }
 180 };
 181
 182 static void cut_comma(char *map, jsmntok_t *newval)
 183 {
 184         int i;
 185
 186         /* Cut off everything after comma */
 187         for (i = newval->start; i < newval->end; i++) {
 188                 if (map[i] == ',')
 189                         newval->end = i;
 190         }
 191 }
 192
 193 static int match_field(char *map, jsmntok_t *field, int nz,
 194                        char **event, jsmntok_t *val)
 195 {
 196         struct field *f;
 197         jsmntok_t newval = *val;
 198
 199         for (f = fields; f->field; f++)
 200                 if (json_streq(map, field, f->field) && nz) {
 201                         cut_comma(map, &newval);
 202                         addfield(map, event, ",", f->kernel, &newval);
 203                         return 1;
 204                 }
 205         return 0;
 206 }
 207
 208 static struct msrmap *lookup_msr(char *map, jsmntok_t *val)
 209 {
 210         jsmntok_t newval = *val;
 211         static bool warned;
 212         int i;
 213
 214         cut_comma(map, &newval);
 215         for (i = 0; msrmap[i].num; i++)
 216                 if (json_streq(map, &newval, msrmap[i].num))
 217                         return &msrmap[i];
 218         if (!warned) {
 219                 warned = true;
 220                 pr_err("%s: Unknown MSR in event file %.*s\n", prog,
 221                         json_len(val), map + val->start);
 222         }
 223         return NULL;
 224 }
 225
 226 static struct map {
 227         const char *json;
 228         const char *perf;
 229 } unit_to_pmu[] = {
 230         { "CBO", "uncore_cbox" },
 231         { "QPI LL", "uncore_qpi" },
 232         { "SBO", "uncore_sbox" },
 233         { "iMPH-U", "uncore_arb" },
 234         {}
 235 };
 236
 237 static const char *field_to_perf(struct map *table, char *map, jsmntok_t *val)
 238 {
 239         int i;
 240
 241         for (i = 0; table[i].json; i++) {
 242                 if (json_streq(map, val, table[i].json))
 243                         return table[i].perf;
 244         }
 245         return NULL;
 246 }
 247
 248 #define EXPECT(e, t, m) do { if (!(e)) {                        \
 249         jsmntok_t *loc = (t);                                   \
 250         if (!(t)->start && (t) > tokens)                        \
 251                 loc = (t) - 1;                                  \
 252                 pr_err("%s:%d: " m ", got %s\n", fn,            \
 253                         json_line(map, loc),                    \
 254                         json_name(t));                          \
 255         goto out_free;                                          \
 256 } } while (0)
 257
 258 #define TOPIC_DEPTH 256
 259 static char *topic_array[TOPIC_DEPTH];
 260 static int   topic_level;
 261
 262 static char *get_topic(void)
 263 {
 264         char *tp_old, *tp = NULL;
 265         int i;
 266
 267         for (i = 0; i < topic_level + 1; i++) {
 268                 int n;
 269
 270                 tp_old = tp;
 271                 n = asprintf(&tp, "%s%s", tp ?: "", topic_array[i]);
 272                 if (n < 0) {
 273                         pr_info("%s: asprintf() error %s\n", prog);
 274                         return NULL;
 275                 }
 276                 free(tp_old);
 277         }
 278
 279         for (i = 0; i < (int) strlen(tp); i++) {
 280                 char c = tp[i];
 281
 282                 if (c == '-')
 283                         tp[i] = ' ';
 284                 else if (c == '.') {
 285                         tp[i] = '\0';
 286                         break;
 287                 }
 288         }
 289
 290         return tp;
 291 }
 292
 293 static int add_topic(int level, char *bname)
 294 {
 295         char *topic;
 296
 297         level -= 2;
 298
 299         if (level >= TOPIC_DEPTH)
 300                 return -EINVAL;
 301
 302         topic = strdup(bname);
 303         if (!topic) {
 304                 pr_info("%s: strdup() error %s for file %s\n", prog,
 305                                 strerror(errno), bname);
 306                 return -ENOMEM;
 307         }
 308
 309         free(topic_array[topic_level]);
 310         topic_array[topic_level] = topic;
 311         topic_level              = level;
 312         return 0;
 313 }
 314
 315 struct perf_entry_data {
 316         FILE *outfp;
 317         char *topic;
 318 };
 319
 320 static int close_table;
 321
 322 static void print_events_table_prefix(FILE *fp, const char *tblname)
 323 {
 324         fprintf(fp, "struct pmu_event %s[] = {\n", tblname);
 325         close_table = 1;
 326 }
 327
 328 static int print_events_table_entry(void *data, char *name, char *event,
 329                                     char *desc, char *long_desc,
 330                                     char *pmu, char *unit, char *perpkg,
 331                                     char *metric_expr,
 332                                     char *metric_name, char *metric_group)
 333 {
 334         struct perf_entry_data *pd = data;
 335         FILE *outfp = pd->outfp;
 336         char *topic = pd->topic;
 337
 338         /*
 339          * TODO: Remove formatting chars after debugging to reduce
 340          *       string lengths.
 341          */
 342         fprintf(outfp, "{\n");
 343
 344         if (name)
 345                 fprintf(outfp, "\t.name = \"%s\",\n", name);
 346         if (event)
 347                 fprintf(outfp, "\t.event = \"%s\",\n", event);
 348         fprintf(outfp, "\t.desc = \"%s\",\n", desc);
 349         fprintf(outfp, "\t.topic = \"%s\",\n", topic);
 350         if (long_desc && long_desc[0])
 351                 fprintf(outfp, "\t.long_desc = \"%s\",\n", long_desc);
 352         if (pmu)
 353                 fprintf(outfp, "\t.pmu = \"%s\",\n", pmu);
 354         if (unit)
 355                 fprintf(outfp, "\t.unit = \"%s\",\n", unit);
 356         if (perpkg)
 357                 fprintf(outfp, "\t.perpkg = \"%s\",\n", perpkg);
 358         if (metric_expr)
 359                 fprintf(outfp, "\t.metric_expr = \"%s\",\n", metric_expr);
 360         if (metric_name)
 361                 fprintf(outfp, "\t.metric_name = \"%s\",\n", metric_name);
 362         if (metric_group)
 363                 fprintf(outfp, "\t.metric_group = \"%s\",\n", metric_group);
 364         fprintf(outfp, "},\n");
 365
 366         return 0;
 367 }
 368
 369 static void print_events_table_suffix(FILE *outfp)
 370 {
 371         fprintf(outfp, "{\n");
 372
 373         fprintf(outfp, "\t.name = 0,\n");
 374         fprintf(outfp, "\t.event = 0,\n");
 375         fprintf(outfp, "\t.desc = 0,\n");
 376
 377         fprintf(outfp, "},\n");
 378         fprintf(outfp, "};\n");
 379         close_table = 0;
 380 }
 381
 382 static struct fixed {
 383         const char *name;
 384         const char *event;
 385 } fixed[] = {
 386         { "inst_retired.any", "event=0xc0" },
 387         { "inst_retired.any_p", "event=0xc0" },
 388         { "cpu_clk_unhalted.ref", "event=0x0,umask=0x03" },
 389         { "cpu_clk_unhalted.thread", "event=0x3c" },
 390         { "cpu_clk_unhalted.thread_any", "event=0x3c,any=1" },
 391         { NULL, NULL},
 392 };
 393
 394 /*
 395  * Handle different fixed counter encodings between JSON and perf.
 396  */
 397 static char *real_event(const char *name, char *event)
 398 {
 399         int i;
 400
 401         if (!name)
 402                 return NULL;
 403
 404         for (i = 0; fixed[i].name; i++)
 405                 if (!strcasecmp(name, fixed[i].name))
 406                         return (char *)fixed[i].event;
 407         return event;
 408 }
 409
 410 /* Call func with each event in the json file */
 411 int json_events(const char *fn,
 412           int (*func)(void *data, char *name, char *event, char *desc,
 413                       char *long_desc,
 414                       char *pmu, char *unit, char *perpkg,
 415                       char *metric_expr,
 416                       char *metric_name, char *metric_group),
 417           void *data)
 418 {
 419         int err = -EIO;
 420         size_t size;
 421         jsmntok_t *tokens, *tok;
 422         int i, j, len;
 423         char *map;
 424         char buf[128];
 425
 426         if (!fn)
 427                 return -ENOENT;
 428
 429         tokens = parse_json(fn, &map, &size, &len);
 430         if (!tokens)
 431                 return -EIO;
 432         EXPECT(tokens->type == JSMN_ARRAY, tokens, "expected top level array");
 433         tok = tokens + 1;
 434         for (i = 0; i < tokens->size; i++) {
 435                 char *event = NULL, *desc = NULL, *name = NULL;
 436                 char *long_desc = NULL;
 437                 char *extra_desc = NULL;
 438                 char *pmu = NULL;
 439                 char *filter = NULL;
 440                 char *perpkg = NULL;
 441                 char *unit = NULL;
 442                 char *metric_expr = NULL;
 443                 char *metric_name = NULL;
 444                 char *metric_group = NULL;
 445                 unsigned long long eventcode = 0;
 446                 struct msrmap *msr = NULL;
 447                 jsmntok_t *msrval = NULL;
 448                 jsmntok_t *precise = NULL;
 449                 jsmntok_t *obj = tok++;
 450
 451                 EXPECT(obj->type == JSMN_OBJECT, obj, "expected object");
 452                 for (j = 0; j < obj->size; j += 2) {
 453                         jsmntok_t *field, *val;
 454                         int nz;
 455                         char *s;
 456
 457                         field = tok + j;
 458                         EXPECT(field->type == JSMN_STRING, tok + j,
 459                                "Expected field name");
 460                         val = tok + j + 1;
 461                         EXPECT(val->type == JSMN_STRING, tok + j + 1,
 462                                "Expected string value");
 463
 464                         nz = !json_streq(map, val, "0");
 465                         if (match_field(map, field, nz, &event, val)) {
 466                                 /* ok */
 467                         } else if (json_streq(map, field, "EventCode")) {
 468                                 char *code = NULL;
 469                                 addfield(map, &code, "", "", val);
 470                                 eventcode |= strtoul(code, NULL, 0);
 471                                 free(code);
 472                         } else if (json_streq(map, field, "ExtSel")) {
 473                                 char *code = NULL;
 474                                 addfield(map, &code, "", "", val);
 475                                 eventcode |= strtoul(code, NULL, 0) << 21;
 476                                 free(code);
 477                         } else if (json_streq(map, field, "EventName")) {
 478                                 addfield(map, &name, "", "", val);
 479                         } else if (json_streq(map, field, "BriefDescription")) {
 480                                 addfield(map, &desc, "", "", val);
 481                                 fixdesc(desc);
 482                         } else if (json_streq(map, field,
 483                                              "PublicDescription")) {
 484                                 addfield(map, &long_desc, "", "", val);
 485                                 fixdesc(long_desc);
 486                         } else if (json_streq(map, field, "PEBS") && nz) {
 487                                 precise = val;
 488                         } else if (json_streq(map, field, "MSRIndex") && nz) {
 489                                 msr = lookup_msr(map, val);
 490                         } else if (json_streq(map, field, "MSRValue")) {
 491                                 msrval = val;
 492                         } else if (json_streq(map, field, "Errata") &&
 493                                    !json_streq(map, val, "null")) {
 494                                 addfield(map, &extra_desc, ". ",
 495                                         " Spec update: ", val);
 496                         } else if (json_streq(map, field, "Data_LA") && nz) {
 497                                 addfield(map, &extra_desc, ". ",
 498                                         " Supports address when precise",
 499                                         NULL);
 500                         } else if (json_streq(map, field, "Unit")) {
 501                                 const char *ppmu;
 502
 503                                 ppmu = field_to_perf(unit_to_pmu, map, val);
 504                                 if (ppmu) {
 505                                         pmu = strdup(ppmu);
 506                                 } else {
 507                                         if (!pmu)
 508                                                 pmu = strdup("uncore_");
 509                                         addfield(map, &pmu, "", "", val);
 510                                         for (s = pmu; *s; s++)
 511                                                 *s = tolower(*s);
 512                                 }
 513                                 addfield(map, &desc, ". ", "Unit: ", NULL);
 514                                 addfield(map, &desc, "", pmu, NULL);
 515                                 addfield(map, &desc, "", " ", NULL);
 516                         } else if (json_streq(map, field, "Filter")) {
 517                                 addfield(map, &filter, "", "", val);
 518                         } else if (json_streq(map, field, "ScaleUnit")) {
 519                                 addfield(map, &unit, "", "", val);
 520                         } else if (json_streq(map, field, "PerPkg")) {
 521                                 addfield(map, &perpkg, "", "", val);
 522                         } else if (json_streq(map, field, "MetricName")) {
 523                                 addfield(map, &metric_name, "", "", val);
 524                         } else if (json_streq(map, field, "MetricGroup")) {
 525                                 addfield(map, &metric_group, "", "", val);
 526                         } else if (json_streq(map, field, "MetricExpr")) {
 527                                 addfield(map, &metric_expr, "", "", val);
 528                                 for (s = metric_expr; *s; s++)
 529                                         *s = tolower(*s);
 530                         }
 531                         /* ignore unknown fields */
 532                 }
 533                 if (precise && desc && !strstr(desc, "(Precise Event)")) {
 534                         if (json_streq(map, precise, "2"))
 535                                 addfield(map, &extra_desc, " ",
 536                                                 "(Must be precise)", NULL);
 537                         else
 538                                 addfield(map, &extra_desc, " ",
 539                                                 "(Precise event)", NULL);
 540                 }
 541                 snprintf(buf, sizeof buf, "event=%#llx", eventcode);
 542                 addfield(map, &event, ",", buf, NULL);
 543                 if (desc && extra_desc)
 544                         addfield(map, &desc, " ", extra_desc, NULL);
 545                 if (long_desc && extra_desc)
 546                         addfield(map, &long_desc, " ", extra_desc, NULL);
 547                 if (filter)
 548                         addfield(map, &event, ",", filter, NULL);
 549                 if (msr != NULL)
 550                         addfield(map, &event, ",", msr->pname, msrval);
 551                 if (name)
 552                         fixname(name);
 553
 554                 err = func(data, name, real_event(name, event), desc, long_desc,
 555                            pmu, unit, perpkg, metric_expr, metric_name, metric_group);
 556                 free(event);
 557                 free(desc);
 558                 free(name);
 559                 free(long_desc);
 560                 free(extra_desc);
 561                 free(pmu);
 562                 free(filter);
 563                 free(perpkg);
 564                 free(unit);
 565                 free(metric_expr);
 566                 free(metric_name);
 567                 free(metric_group);
 568                 if (err)
 569                         break;
 570                 tok += j;
 571         }
 572         EXPECT(tok - tokens == len, tok, "unexpected objects at end");
 573         err = 0;
 574 out_free:
 575         free_json(map, size, tokens);
 576         return err;
 577 }
 578
 579 static char *file_name_to_table_name(char *fname)
 580 {
 581         unsigned int i;
 582         int n;
 583         int c;
 584         char *tblname;
 585
 586         /*
 587          * Ensure tablename starts with alphabetic character.
 588          * Derive rest of table name from basename of the JSON file,
 589          * replacing hyphens and stripping out .json suffix.
 590          */
 591         n = asprintf(&tblname, "pme_%s", basename(fname));
 592         if (n < 0) {
 593                 pr_info("%s: asprintf() error %s for file %s\n", prog,
 594                                 strerror(errno), fname);
 595                 return NULL;
 596         }
 597
 598         for (i = 0; i < strlen(tblname); i++) {
 599                 c = tblname[i];
 600
 601                 if (c == '-')
 602                         tblname[i] = '_';
 603                 else if (c == '.') {
 604                         tblname[i] = '\0';
 605                         break;
 606                 } else if (!isalnum(c) && c != '_') {
 607                         pr_err("%s: Invalid character '%c' in file name %s\n",
 608                                         prog, c, basename(fname));
 609                         free(tblname);
 610                         tblname = NULL;
 611                         break;
 612                 }
 613         }
 614
 615         return tblname;
 616 }
 617
 618 static void print_mapping_table_prefix(FILE *outfp)
 619 {
 620         fprintf(outfp, "struct pmu_events_map pmu_events_map[] = {\n");
 621 }
 622
 623 static void print_mapping_table_suffix(FILE *outfp)
 624 {
 625         /*
 626          * Print the terminating, NULL entry.
 627          */
 628         fprintf(outfp, "{\n");
 629         fprintf(outfp, "\t.cpuid = 0,\n");
 630         fprintf(outfp, "\t.version = 0,\n");
 631         fprintf(outfp, "\t.type = 0,\n");
 632         fprintf(outfp, "\t.table = 0,\n");
 633         fprintf(outfp, "},\n");
 634
 635         /* and finally, the closing curly bracket for the struct */
 636         fprintf(outfp, "};\n");
 637 }
 638
 639 static int process_mapfile(FILE *outfp, char *fpath)
 640 {
 641         int n = 16384;
 642         FILE *mapfp;
 643         char *save = NULL;
 644         char *line, *p;
 645         int line_num;
 646         char *tblname;
 647
 648         pr_info("%s: Processing mapfile %s\n", prog, fpath);
 649
 650         line = malloc(n);
 651         if (!line)
 652                 return -1;
 653
 654         mapfp = fopen(fpath, "r");
 655         if (!mapfp) {
 656                 pr_info("%s: Error %s opening %s\n", prog, strerror(errno),
 657                                 fpath);
 658                 return -1;
 659         }
 660
 661         print_mapping_table_prefix(outfp);
 662
 663         /* Skip first line (header) */
 664         p = fgets(line, n, mapfp);
 665         if (!p)
 666                 goto out;
 667
 668         line_num = 1;
 669         while (1) {
 670                 char *cpuid, *version, *type, *fname;
 671
 672                 line_num++;
 673                 p = fgets(line, n, mapfp);
 674                 if (!p)
 675                         break;
 676
 677                 if (line[0] == '#' || line[0] == '\n')
 678                         continue;
 679
 680                 if (line[strlen(line)-1] != '\n') {
 681                         /* TODO Deal with lines longer than 16K */
 682                         pr_info("%s: Mapfile %s: line %d too long, aborting\n",
 683                                         prog, fpath, line_num);
 684                         return -1;
 685                 }
 686                 line[strlen(line)-1] = '\0';
 687
 688                 cpuid = fixregex(strtok_r(p, ",", &save));
 689                 version = strtok_r(NULL, ",", &save);
 690                 fname = strtok_r(NULL, ",", &save);
 691                 type = strtok_r(NULL, ",", &save);
 692
 693                 tblname = file_name_to_table_name(fname);
 694                 fprintf(outfp, "{\n");
 695                 fprintf(outfp, "\t.cpuid = \"%s\",\n", cpuid);
 696                 fprintf(outfp, "\t.version = \"%s\",\n", version);
 697                 fprintf(outfp, "\t.type = \"%s\",\n", type);
 698
 699                 /*
 700                  * CHECK: We can't use the type (eg "core") field in the
 701                  * table name. For us to do that, we need to somehow tweak
 702                  * the other caller of file_name_to_table(), process_json()
 703                  * to determine the type. process_json() file has no way
 704                  * of knowing these are "core" events unless file name has
 705                  * core in it. If filename has core in it, we can safely
 706                  * ignore the type field here also.
 707                  */
 708                 fprintf(outfp, "\t.table = %s\n", tblname);
 709                 fprintf(outfp, "},\n");
 710         }
 711
 712 out:
 713         print_mapping_table_suffix(outfp);
 714         return 0;
 715 }
 716
 717 /*
 718  * If we fail to locate/process JSON and map files, create a NULL mapping
 719  * table. This would at least allow perf to build even if we can't find/use
 720  * the aliases.
 721  */
 722 static void create_empty_mapping(const char *output_file)
 723 {
 724         FILE *outfp;
 725
 726         pr_info("%s: Creating empty pmu_events_map[] table\n", prog);
 727
 728         /* Truncate file to clear any partial writes to it */
 729         outfp = fopen(output_file, "w");
 730         if (!outfp) {
 731                 perror("fopen()");
 732                 _Exit(1);
 733         }
 734
 735         fprintf(outfp, "#include \"../../pmu-events/pmu-events.h\"\n");
 736         print_mapping_table_prefix(outfp);
 737         print_mapping_table_suffix(outfp);
 738         fclose(outfp);
 739 }
 740
 741 static int get_maxfds(void)
 742 {
 743         struct rlimit rlim;
 744
 745         if (getrlimit(RLIMIT_NOFILE, &rlim) == 0)
 746                 return min((int)rlim.rlim_max / 2, 512);
 747
 748         return 512;
 749 }
 750
 751 /*
 752  * nftw() doesn't let us pass an argument to the processing function,
 753  * so use a global variables.
 754  */
 755 static FILE *eventsfp;
 756 static char *mapfile;
 757
 758 static int process_one_file(const char *fpath, const struct stat *sb,
 759                             int typeflag, struct FTW *ftwbuf)
 760 {
 761         char *tblname, *bname  = (char *) fpath + ftwbuf->base;
 762         int is_dir  = typeflag == FTW_D;
 763         int is_file = typeflag == FTW_F;
 764         int level   = ftwbuf->level;
 765         int err = 0;
 766
 767         pr_debug("%s %d %7jd %-20s %s\n",
 768                  is_file ? "f" : is_dir ? "d" : "x",
 769                  level, sb->st_size, bname, fpath);
 770
 771         /* base dir */
 772         if (level == 0)
 773                 return 0;
 774
 775         /* model directory, reset topic */
 776         if (level == 1 && is_dir) {
 777                 if (close_table)
 778                         print_events_table_suffix(eventsfp);
 779
 780                 /*
 781                  * Drop file name suffix. Replace hyphens with underscores.
 782                  * Fail if file name contains any alphanum characters besides
 783                  * underscores.
 784                  */
 785                 tblname = file_name_to_table_name(bname);
 786                 if (!tblname) {
 787                         pr_info("%s: Error determining table name for %s\n", prog,
 788                                 bname);
 789                         return -1;
 790                 }
 791
 792                 print_events_table_prefix(eventsfp, tblname);
 793                 return 0;
 794         }
 795
 796         /*
 797          * Save the mapfile name for now. We will process mapfile
 798          * after processing all JSON files (so we can write out the
 799          * mapping table after all PMU events tables).
 800          *
 801          * TODO: Allow for multiple mapfiles? Punt for now.
 802          */
 803         if (level == 1 && is_file) {
 804                 if (!strncmp(bname, "mapfile.csv", 11)) {
 805                         if (mapfile) {
 806                                 pr_info("%s: Many mapfiles? Using %s, ignoring %s\n",
 807                                                 prog, mapfile, fpath);
 808                         } else {
 809                                 mapfile = strdup(fpath);
 810                         }
 811                         return 0;
 812                 }
 813
 814                 pr_info("%s: Ignoring file %s\n", prog, fpath);
 815                 return 0;
 816         }
 817
 818         /*
 819          * If the file name does not have a .json extension,
 820          * ignore it. It could be a readme.txt for instance.
 821          */
 822         if (is_file) {
 823                 char *suffix = bname + strlen(bname) - 5;
 824
 825                 if (strncmp(suffix, ".json", 5)) {
 826                         pr_info("%s: Ignoring file without .json suffix %s\n", prog,
 827                                 fpath);
 828                         return 0;
 829                 }
 830         }
 831
 832         if (level > 1 && add_topic(level, bname))
 833                 return -ENOMEM;
 834
 835         /*
 836          * Assume all other files are JSON files.
 837          *
 838          * If mapfile refers to 'power7_core.json', we create a table
 839          * named 'power7_core'. Any inconsistencies between the mapfile
 840          * and directory tree could result in build failure due to table
 841          * names not being found.
 842          *
 843          * Atleast for now, be strict with processing JSON file names.
 844          * i.e. if JSON file name cannot be mapped to C-style table name,
 845          * fail.
 846          */
 847         if (is_file) {
 848                 struct perf_entry_data data = {
 849                         .topic = get_topic(),
 850                         .outfp = eventsfp,
 851                 };
 852
 853                 err = json_events(fpath, print_events_table_entry, &data);
 854
 855                 free(data.topic);
 856         }
 857
 858         return err;
 859 }
 860
 861 #ifndef PATH_MAX
 862 #define PATH_MAX        4096
 863 #endif
 864
 865 /*
 866  * Starting in directory 'start_dirname', find the "mapfile.csv" and
 867  * the set of JSON files for the architecture 'arch'.
 868  *
 869  * From each JSON file, create a C-style "PMU events table" from the
 870  * JSON file (see struct pmu_event).
 871  *
 872  * From the mapfile, create a mapping between the CPU revisions and
 873  * PMU event tables (see struct pmu_events_map).
 874  *
 875  * Write out the PMU events tables and the mapping table to pmu-event.c.
 876  */
 877 int main(int argc, char *argv[])
 878 {
 879         int rc;
 880         int maxfds;
 881         char ldirname[PATH_MAX];
 882
 883         const char *arch;
 884         const char *output_file;
 885         const char *start_dirname;
 886         struct stat stbuf;
 887
 888         prog = basename(argv[0]);
 889         if (argc < 4) {
 890                 pr_err("Usage: %s <arch> <starting_dir> <output_file>\n", prog);
 891                 return 1;
 892         }
 893
 894         arch = argv[1];
 895         start_dirname = argv[2];
 896         output_file = argv[3];
 897
 898         if (argc > 4)
 899                 verbose = atoi(argv[4]);
 900
 901         eventsfp = fopen(output_file, "w");
 902         if (!eventsfp) {
 903                 pr_err("%s Unable to create required file %s (%s)\n",
 904                                 prog, output_file, strerror(errno));
 905                 return 2;
 906         }
 907
 908         sprintf(ldirname, "%s/%s", start_dirname, arch);
 909
 910         /* If architecture does not have any event lists, bail out */
 911         if (stat(ldirname, &stbuf) < 0) {
 912                 pr_info("%s: Arch %s has no PMU event lists\n", prog, arch);
 913                 goto empty_map;
 914         }
 915
 916         /* Include pmu-events.h first */
 917         fprintf(eventsfp, "#include \"../../pmu-events/pmu-events.h\"\n");
 918
 919         /*
 920          * The mapfile allows multiple CPUids to point to the same JSON file,
 921          * so, not sure if there is a need for symlinks within the pmu-events
 922          * directory.
 923          *
 924          * For now, treat symlinks of JSON files as regular files and create
 925          * separate tables for each symlink (presumably, each symlink refers
 926          * to specific version of the CPU).
 927          */
 928
 929         maxfds = get_maxfds();
 930         mapfile = NULL;
 931         rc = nftw(ldirname, process_one_file, maxfds, 0);
 932         if (rc && verbose) {
 933                 pr_info("%s: Error walking file tree %s\n", prog, ldirname);
 934                 goto empty_map;
 935         } else if (rc < 0) {
 936                 /* Make build fail */
 937                 return 1;
 938         } else if (rc) {
 939                 goto empty_map;
 940         }
 941
 942         if (close_table)
 943                 print_events_table_suffix(eventsfp);
 944
 945         if (!mapfile) {
 946                 pr_info("%s: No CPU->JSON mapping?\n", prog);
 947                 goto empty_map;
 948         }
 949
 950         if (process_mapfile(eventsfp, mapfile)) {
 951                 pr_info("%s: Error processing mapfile %s\n", prog, mapfile);
 952                 /* Make build fail */
 953                 return 1;
 954         }
 955
 956         return 0;
 957
 958 empty_map:
 959         fclose(eventsfp);
 960         create_empty_mapping(output_file);
 961         return 0;
 962 }