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 <limits.h>
  43 #include <dirent.h>
  44 #include <sys/time.h>                   /* getrlimit */
  45 #include <sys/resource.h>               /* getrlimit */
  46 #include <ftw.h>
  47 #include <sys/stat.h>
  48 #include <linux/list.h>
  49 #include "jsmn.h"
  50 #include "json.h"
  51 #include "jevents.h"
  52
  53 int verbose;
  54 char *prog;
  55
  56 int eprintf(int level, int var, const char *fmt, ...)
  57 {
  58
  59         int ret;
  60         va_list args;
  61
  62         if (var < level)
  63                 return 0;
  64
  65         va_start(args, fmt);
  66
  67         ret = vfprintf(stderr, fmt, args);
  68
  69         va_end(args);
  70
  71         return ret;
  72 }
  73
  74 __attribute__((weak)) char *get_cpu_str(void)
  75 {
  76         return NULL;
  77 }
  78
  79 static void addfield(char *map, char **dst, const char *sep,
  80                      const char *a, jsmntok_t *bt)
  81 {
  82         unsigned int len = strlen(a) + 1 + strlen(sep);
  83         int olen = *dst ? strlen(*dst) : 0;
  84         int blen = bt ? json_len(bt) : 0;
  85         char *out;
  86
  87         out = realloc(*dst, len + olen + blen);
  88         if (!out) {
  89                 /* Don't add field in this case */
  90                 return;
  91         }
  92         *dst = out;
  93
  94         if (!olen)
  95                 *(*dst) = 0;
  96         else
  97                 strcat(*dst, sep);
  98         strcat(*dst, a);
  99         if (bt)
 100                 strncat(*dst, map + bt->start, blen);
 101 }
 102
 103 static void fixname(char *s)
 104 {
 105         for (; *s; s++)
 106                 *s = tolower(*s);
 107 }
 108
 109 static void fixdesc(char *s)
 110 {
 111         char *e = s + strlen(s);
 112
 113         /* Remove trailing dots that look ugly in perf list */
 114         --e;
 115         while (e >= s && isspace(*e))
 116                 --e;
 117         if (*e == '.')
 118                 *e = 0;
 119 }
 120
 121 /* Add escapes for '\' so they are proper C strings. */
 122 static char *fixregex(char *s)
 123 {
 124         int len = 0;
 125         int esc_count = 0;
 126         char *fixed = NULL;
 127         char *p, *q;
 128
 129         /* Count the number of '\' in string */
 130         for (p = s; *p; p++) {
 131                 ++len;
 132                 if (*p == '\\')
 133                         ++esc_count;
 134         }
 135
 136         if (esc_count == 0)
 137                 return s;
 138
 139         /* allocate space for a new string */
 140         fixed = (char *) malloc(len + 1);
 141         if (!fixed)
 142                 return NULL;
 143
 144         /* copy over the characters */
 145         q = fixed;
 146         for (p = s; *p; p++) {
 147                 if (*p == '\\') {
 148                         *q = '\\';
 149                         ++q;
 150                 }
 151                 *q = *p;
 152                 ++q;
 153         }
 154         *q = '\0';
 155         return fixed;
 156 }
 157
 158 static struct msrmap {
 159         const char *num;
 160         const char *pname;
 161 } msrmap[] = {
 162         { "0x3F6", "ldlat=" },
 163         { "0x1A6", "offcore_rsp=" },
 164         { "0x1A7", "offcore_rsp=" },
 165         { "0x3F7", "frontend=" },
 166         { NULL, NULL }
 167 };
 168
 169 static struct field {
 170         const char *field;
 171         const char *kernel;
 172 } fields[] = {
 173         { "UMask",      "umask=" },
 174         { "CounterMask", "cmask=" },
 175         { "Invert",     "inv=" },
 176         { "AnyThread",  "any=" },
 177         { "EdgeDetect", "edge=" },
 178         { "SampleAfterValue", "period=" },
 179         { "FCMask",     "fc_mask=" },
 180         { "PortMask",   "ch_mask=" },
 181         { NULL, NULL }
 182 };
 183
 184 static void cut_comma(char *map, jsmntok_t *newval)
 185 {
 186         int i;
 187
 188         /* Cut off everything after comma */
 189         for (i = newval->start; i < newval->end; i++) {
 190                 if (map[i] == ',')
 191                         newval->end = i;
 192         }
 193 }
 194
 195 static int match_field(char *map, jsmntok_t *field, int nz,
 196                        char **event, jsmntok_t *val)
 197 {
 198         struct field *f;
 199         jsmntok_t newval = *val;
 200
 201         for (f = fields; f->field; f++)
 202                 if (json_streq(map, field, f->field) && nz) {
 203                         cut_comma(map, &newval);
 204                         addfield(map, event, ",", f->kernel, &newval);
 205                         return 1;
 206                 }
 207         return 0;
 208 }
 209
 210 static struct msrmap *lookup_msr(char *map, jsmntok_t *val)
 211 {
 212         jsmntok_t newval = *val;
 213         static bool warned;
 214         int i;
 215
 216         cut_comma(map, &newval);
 217         for (i = 0; msrmap[i].num; i++)
 218                 if (json_streq(map, &newval, msrmap[i].num))
 219                         return &msrmap[i];
 220         if (!warned) {
 221                 warned = true;
 222                 pr_err("%s: Unknown MSR in event file %.*s\n", prog,
 223                         json_len(val), map + val->start);
 224         }
 225         return NULL;
 226 }
 227
 228 static struct map {
 229         const char *json;
 230         const char *perf;
 231 } unit_to_pmu[] = {
 232         { "CBO", "uncore_cbox" },
 233         { "QPI LL", "uncore_qpi" },
 234         { "SBO", "uncore_sbox" },
 235         { "iMPH-U", "uncore_arb" },
 236         { "CPU-M-CF", "cpum_cf" },
 237         { "CPU-M-SF", "cpum_sf" },
 238         { "UPI LL", "uncore_upi" },
 239         { "hisi_sccl,ddrc", "hisi_sccl,ddrc" },
 240         { "hisi_sccl,hha", "hisi_sccl,hha" },
 241         { "hisi_sccl,l3c", "hisi_sccl,l3c" },
 242         {}
 243 };
 244
 245 static const char *field_to_perf(struct map *table, char *map, jsmntok_t *val)
 246 {
 247         int i;
 248
 249         for (i = 0; table[i].json; i++) {
 250                 if (json_streq(map, val, table[i].json))
 251                         return table[i].perf;
 252         }
 253         return NULL;
 254 }
 255
 256 #define EXPECT(e, t, m) do { if (!(e)) {                        \
 257         jsmntok_t *loc = (t);                                   \
 258         if (!(t)->start && (t) > tokens)                        \
 259                 loc = (t) - 1;                                  \
 260         pr_err("%s:%d: " m ", got %s\n", fn,                    \
 261                json_line(map, loc),                             \
 262                json_name(t));                                   \
 263         err = -EIO;                                             \
 264         goto out_free;                                          \
 265 } } while (0)
 266
 267 static char *topic;
 268
 269 static char *get_topic(void)
 270 {
 271         char *tp;
 272         int i;
 273
 274         /* tp is free'd in process_one_file() */
 275         i = asprintf(&tp, "%s", topic);
 276         if (i < 0) {
 277                 pr_info("%s: asprintf() error %s\n", prog);
 278                 return NULL;
 279         }
 280
 281         for (i = 0; i < (int) strlen(tp); i++) {
 282                 char c = tp[i];
 283
 284                 if (c == '-')
 285                         tp[i] = ' ';
 286                 else if (c == '.') {
 287                         tp[i] = '\0';
 288                         break;
 289                 }
 290         }
 291
 292         return tp;
 293 }
 294
 295 static int add_topic(char *bname)
 296 {
 297         free(topic);
 298         topic = strdup(bname);
 299         if (!topic) {
 300                 pr_info("%s: strdup() error %s for file %s\n", prog,
 301                                 strerror(errno), bname);
 302                 return -ENOMEM;
 303         }
 304         return 0;
 305 }
 306
 307 struct perf_entry_data {
 308         FILE *outfp;
 309         char *topic;
 310 };
 311
 312 static int close_table;
 313
 314 static void print_events_table_prefix(FILE *fp, const char *tblname)
 315 {
 316         fprintf(fp, "struct pmu_event %s[] = {\n", tblname);
 317         close_table = 1;
 318 }
 319
 320 static int print_events_table_entry(void *data, char *name, char *event,
 321                                     char *desc, char *long_desc,
 322                                     char *pmu, char *unit, char *perpkg,
 323                                     char *metric_expr,
 324                                     char *metric_name, char *metric_group)
 325 {
 326         struct perf_entry_data *pd = data;
 327         FILE *outfp = pd->outfp;
 328         char *topic = pd->topic;
 329
 330         /*
 331          * TODO: Remove formatting chars after debugging to reduce
 332          *       string lengths.
 333          */
 334         fprintf(outfp, "{\n");
 335
 336         if (name)
 337                 fprintf(outfp, "\t.name = \"%s\",\n", name);
 338         if (event)
 339                 fprintf(outfp, "\t.event = \"%s\",\n", event);
 340         fprintf(outfp, "\t.desc = \"%s\",\n", desc);
 341         fprintf(outfp, "\t.topic = \"%s\",\n", topic);
 342         if (long_desc && long_desc[0])
 343                 fprintf(outfp, "\t.long_desc = \"%s\",\n", long_desc);
 344         if (pmu)
 345                 fprintf(outfp, "\t.pmu = \"%s\",\n", pmu);
 346         if (unit)
 347                 fprintf(outfp, "\t.unit = \"%s\",\n", unit);
 348         if (perpkg)
 349                 fprintf(outfp, "\t.perpkg = \"%s\",\n", perpkg);
 350         if (metric_expr)
 351                 fprintf(outfp, "\t.metric_expr = \"%s\",\n", metric_expr);
 352         if (metric_name)
 353                 fprintf(outfp, "\t.metric_name = \"%s\",\n", metric_name);
 354         if (metric_group)
 355                 fprintf(outfp, "\t.metric_group = \"%s\",\n", metric_group);
 356         fprintf(outfp, "},\n");
 357
 358         return 0;
 359 }
 360
 361 struct event_struct {
 362         struct list_head list;
 363         char *name;
 364         char *event;
 365         char *desc;
 366         char *long_desc;
 367         char *pmu;
 368         char *unit;
 369         char *perpkg;
 370         char *metric_expr;
 371         char *metric_name;
 372         char *metric_group;
 373 };
 374
 375 #define ADD_EVENT_FIELD(field) do { if (field) {                \
 376         es->field = strdup(field);                              \
 377         if (!es->field)                                         \
 378                 goto out_free;                                  \
 379 } } while (0)
 380
 381 #define FREE_EVENT_FIELD(field) free(es->field)
 382
 383 #define TRY_FIXUP_FIELD(field) do { if (es->field && !*field) {\
 384         *field = strdup(es->field);                             \
 385         if (!*field)                                            \
 386                 return -ENOMEM;                                 \
 387 } } while (0)
 388
 389 #define FOR_ALL_EVENT_STRUCT_FIELDS(op) do {                    \
 390         op(name);                                               \
 391         op(event);                                              \
 392         op(desc);                                               \
 393         op(long_desc);                                          \
 394         op(pmu);                                                \
 395         op(unit);                                               \
 396         op(perpkg);                                             \
 397         op(metric_expr);                                        \
 398         op(metric_name);                                        \
 399         op(metric_group);                                       \
 400 } while (0)
 401
 402 static LIST_HEAD(arch_std_events);
 403
 404 static void free_arch_std_events(void)
 405 {
 406         struct event_struct *es, *next;
 407
 408         list_for_each_entry_safe(es, next, &arch_std_events, list) {
 409                 FOR_ALL_EVENT_STRUCT_FIELDS(FREE_EVENT_FIELD);
 410                 list_del_init(&es->list);
 411                 free(es);
 412         }
 413 }
 414
 415 static int save_arch_std_events(void *data, char *name, char *event,
 416                                 char *desc, char *long_desc, char *pmu,
 417                                 char *unit, char *perpkg, char *metric_expr,
 418                                 char *metric_name, char *metric_group)
 419 {
 420         struct event_struct *es;
 421
 422         es = malloc(sizeof(*es));
 423         if (!es)
 424                 return -ENOMEM;
 425         memset(es, 0, sizeof(*es));
 426         FOR_ALL_EVENT_STRUCT_FIELDS(ADD_EVENT_FIELD);
 427         list_add_tail(&es->list, &arch_std_events);
 428         return 0;
 429 out_free:
 430         FOR_ALL_EVENT_STRUCT_FIELDS(FREE_EVENT_FIELD);
 431         free(es);
 432         return -ENOMEM;
 433 }
 434
 435 static void print_events_table_suffix(FILE *outfp)
 436 {
 437         fprintf(outfp, "{\n");
 438
 439         fprintf(outfp, "\t.name = 0,\n");
 440         fprintf(outfp, "\t.event = 0,\n");
 441         fprintf(outfp, "\t.desc = 0,\n");
 442
 443         fprintf(outfp, "},\n");
 444         fprintf(outfp, "};\n");
 445         close_table = 0;
 446 }
 447
 448 static struct fixed {
 449         const char *name;
 450         const char *event;
 451 } fixed[] = {
 452         { "inst_retired.any", "event=0xc0" },
 453         { "inst_retired.any_p", "event=0xc0" },
 454         { "cpu_clk_unhalted.ref", "event=0x0,umask=0x03" },
 455         { "cpu_clk_unhalted.thread", "event=0x3c" },
 456         { "cpu_clk_unhalted.thread_any", "event=0x3c,any=1" },
 457         { NULL, NULL},
 458 };
 459
 460 /*
 461  * Handle different fixed counter encodings between JSON and perf.
 462  */
 463 static char *real_event(const char *name, char *event)
 464 {
 465         int i;
 466
 467         if (!name)
 468                 return NULL;
 469
 470         for (i = 0; fixed[i].name; i++)
 471                 if (!strcasecmp(name, fixed[i].name))
 472                         return (char *)fixed[i].event;
 473         return event;
 474 }
 475
 476 static int
 477 try_fixup(const char *fn, char *arch_std, char **event, char **desc,
 478           char **name, char **long_desc, char **pmu, char **filter,
 479           char **perpkg, char **unit, char **metric_expr, char **metric_name,
 480           char **metric_group, unsigned long long eventcode)
 481 {
 482         /* try to find matching event from arch standard values */
 483         struct event_struct *es;
 484
 485         list_for_each_entry(es, &arch_std_events, list) {
 486                 if (!strcmp(arch_std, es->name)) {
 487                         if (!eventcode && es->event) {
 488                                 /* allow EventCode to be overridden */
 489                                 free(*event);
 490                                 *event = NULL;
 491                         }
 492                         FOR_ALL_EVENT_STRUCT_FIELDS(TRY_FIXUP_FIELD);
 493                         return 0;
 494                 }
 495         }
 496
 497         pr_err("%s: could not find matching %s for %s\n",
 498                                         prog, arch_std, fn);
 499         return -1;
 500 }
 501
 502 /* Call func with each event in the json file */
 503 int json_events(const char *fn,
 504           int (*func)(void *data, char *name, char *event, char *desc,
 505                       char *long_desc,
 506                       char *pmu, char *unit, char *perpkg,
 507                       char *metric_expr,
 508                       char *metric_name, char *metric_group),
 509           void *data)
 510 {
 511         int err;
 512         size_t size;
 513         jsmntok_t *tokens, *tok;
 514         int i, j, len;
 515         char *map;
 516         char buf[128];
 517
 518         if (!fn)
 519                 return -ENOENT;
 520
 521         tokens = parse_json(fn, &map, &size, &len);
 522         if (!tokens)
 523                 return -EIO;
 524         EXPECT(tokens->type == JSMN_ARRAY, tokens, "expected top level array");
 525         tok = tokens + 1;
 526         for (i = 0; i < tokens->size; i++) {
 527                 char *event = NULL, *desc = NULL, *name = NULL;
 528                 char *long_desc = NULL;
 529                 char *extra_desc = NULL;
 530                 char *pmu = NULL;
 531                 char *filter = NULL;
 532                 char *perpkg = NULL;
 533                 char *unit = NULL;
 534                 char *metric_expr = NULL;
 535                 char *metric_name = NULL;
 536                 char *metric_group = NULL;
 537                 char *arch_std = NULL;
 538                 unsigned long long eventcode = 0;
 539                 struct msrmap *msr = NULL;
 540                 jsmntok_t *msrval = NULL;
 541                 jsmntok_t *precise = NULL;
 542                 jsmntok_t *obj = tok++;
 543
 544                 EXPECT(obj->type == JSMN_OBJECT, obj, "expected object");
 545                 for (j = 0; j < obj->size; j += 2) {
 546                         jsmntok_t *field, *val;
 547                         int nz;
 548                         char *s;
 549
 550                         field = tok + j;
 551                         EXPECT(field->type == JSMN_STRING, tok + j,
 552                                "Expected field name");
 553                         val = tok + j + 1;
 554                         EXPECT(val->type == JSMN_STRING, tok + j + 1,
 555                                "Expected string value");
 556
 557                         nz = !json_streq(map, val, "0");
 558                         if (match_field(map, field, nz, &event, val)) {
 559                                 /* ok */
 560                         } else if (json_streq(map, field, "EventCode")) {
 561                                 char *code = NULL;
 562                                 addfield(map, &code, "", "", val);
 563                                 eventcode |= strtoul(code, NULL, 0);
 564                                 free(code);
 565                         } else if (json_streq(map, field, "ExtSel")) {
 566                                 char *code = NULL;
 567                                 addfield(map, &code, "", "", val);
 568                                 eventcode |= strtoul(code, NULL, 0) << 21;
 569                                 free(code);
 570                         } else if (json_streq(map, field, "EventName")) {
 571                                 addfield(map, &name, "", "", val);
 572                         } else if (json_streq(map, field, "BriefDescription")) {
 573                                 addfield(map, &desc, "", "", val);
 574                                 fixdesc(desc);
 575                         } else if (json_streq(map, field,
 576                                              "PublicDescription")) {
 577                                 addfield(map, &long_desc, "", "", val);
 578                                 fixdesc(long_desc);
 579                         } else if (json_streq(map, field, "PEBS") && nz) {
 580                                 precise = val;
 581                         } else if (json_streq(map, field, "MSRIndex") && nz) {
 582                                 msr = lookup_msr(map, val);
 583                         } else if (json_streq(map, field, "MSRValue")) {
 584                                 msrval = val;
 585                         } else if (json_streq(map, field, "Errata") &&
 586                                    !json_streq(map, val, "null")) {
 587                                 addfield(map, &extra_desc, ". ",
 588                                         " Spec update: ", val);
 589                         } else if (json_streq(map, field, "Data_LA") && nz) {
 590                                 addfield(map, &extra_desc, ". ",
 591                                         " Supports address when precise",
 592                                         NULL);
 593                         } else if (json_streq(map, field, "Unit")) {
 594                                 const char *ppmu;
 595
 596                                 ppmu = field_to_perf(unit_to_pmu, map, val);
 597                                 if (ppmu) {
 598                                         pmu = strdup(ppmu);
 599                                 } else {
 600                                         if (!pmu)
 601                                                 pmu = strdup("uncore_");
 602                                         addfield(map, &pmu, "", "", val);
 603                                         for (s = pmu; *s; s++)
 604                                                 *s = tolower(*s);
 605                                 }
 606                                 addfield(map, &desc, ". ", "Unit: ", NULL);
 607                                 addfield(map, &desc, "", pmu, NULL);
 608                                 addfield(map, &desc, "", " ", NULL);
 609                         } else if (json_streq(map, field, "Filter")) {
 610                                 addfield(map, &filter, "", "", val);
 611                         } else if (json_streq(map, field, "ScaleUnit")) {
 612                                 addfield(map, &unit, "", "", val);
 613                         } else if (json_streq(map, field, "PerPkg")) {
 614                                 addfield(map, &perpkg, "", "", val);
 615                         } else if (json_streq(map, field, "MetricName")) {
 616                                 addfield(map, &metric_name, "", "", val);
 617                         } else if (json_streq(map, field, "MetricGroup")) {
 618                                 addfield(map, &metric_group, "", "", val);
 619                         } else if (json_streq(map, field, "MetricExpr")) {
 620                                 addfield(map, &metric_expr, "", "", val);
 621                                 for (s = metric_expr; *s; s++)
 622                                         *s = tolower(*s);
 623                         } else if (json_streq(map, field, "ArchStdEvent")) {
 624                                 addfield(map, &arch_std, "", "", val);
 625                                 for (s = arch_std; *s; s++)
 626                                         *s = tolower(*s);
 627                         }
 628                         /* ignore unknown fields */
 629                 }
 630                 if (precise && desc && !strstr(desc, "(Precise Event)")) {
 631                         if (json_streq(map, precise, "2"))
 632                                 addfield(map, &extra_desc, " ",
 633                                                 "(Must be precise)", NULL);
 634                         else
 635                                 addfield(map, &extra_desc, " ",
 636                                                 "(Precise event)", NULL);
 637                 }
 638                 snprintf(buf, sizeof buf, "event=%#llx", eventcode);
 639                 addfield(map, &event, ",", buf, NULL);
 640                 if (desc && extra_desc)
 641                         addfield(map, &desc, " ", extra_desc, NULL);
 642                 if (long_desc && extra_desc)
 643                         addfield(map, &long_desc, " ", extra_desc, NULL);
 644                 if (filter)
 645                         addfield(map, &event, ",", filter, NULL);
 646                 if (msr != NULL)
 647                         addfield(map, &event, ",", msr->pname, msrval);
 648                 if (name)
 649                         fixname(name);
 650
 651                 if (arch_std) {
 652                         /*
 653                          * An arch standard event is referenced, so try to
 654                          * fixup any unassigned values.
 655                          */
 656                         err = try_fixup(fn, arch_std, &event, &desc, &name,
 657                                         &long_desc, &pmu, &filter, &perpkg,
 658                                         &unit, &metric_expr, &metric_name,
 659                                         &metric_group, eventcode);
 660                         if (err)
 661                                 goto free_strings;
 662                 }
 663                 err = func(data, name, real_event(name, event), desc, long_desc,
 664                            pmu, unit, perpkg, metric_expr, metric_name, metric_group);
 665 free_strings:
 666                 free(event);
 667                 free(desc);
 668                 free(name);
 669                 free(long_desc);
 670                 free(extra_desc);
 671                 free(pmu);
 672                 free(filter);
 673                 free(perpkg);
 674                 free(unit);
 675                 free(metric_expr);
 676                 free(metric_name);
 677                 free(metric_group);
 678                 free(arch_std);
 679
 680                 if (err)
 681                         break;
 682                 tok += j;
 683         }
 684         EXPECT(tok - tokens == len, tok, "unexpected objects at end");
 685         err = 0;
 686 out_free:
 687         free_json(map, size, tokens);
 688         return err;
 689 }
 690
 691 static char *file_name_to_table_name(char *fname)
 692 {
 693         unsigned int i;
 694         int n;
 695         int c;
 696         char *tblname;
 697
 698         /*
 699          * Ensure tablename starts with alphabetic character.
 700          * Derive rest of table name from basename of the JSON file,
 701          * replacing hyphens and stripping out .json suffix.
 702          */
 703         n = asprintf(&tblname, "pme_%s", fname);
 704         if (n < 0) {
 705                 pr_info("%s: asprintf() error %s for file %s\n", prog,
 706                                 strerror(errno), fname);
 707                 return NULL;
 708         }
 709
 710         for (i = 0; i < strlen(tblname); i++) {
 711                 c = tblname[i];
 712
 713                 if (c == '-' || c == '/')
 714                         tblname[i] = '_';
 715                 else if (c == '.') {
 716                         tblname[i] = '\0';
 717                         break;
 718                 } else if (!isalnum(c) && c != '_') {
 719                         pr_err("%s: Invalid character '%c' in file name %s\n",
 720                                         prog, c, basename(fname));
 721                         free(tblname);
 722                         tblname = NULL;
 723                         break;
 724                 }
 725         }
 726
 727         return tblname;
 728 }
 729
 730 static void print_mapping_table_prefix(FILE *outfp)
 731 {
 732         fprintf(outfp, "struct pmu_events_map pmu_events_map[] = {\n");
 733 }
 734
 735 static void print_mapping_table_suffix(FILE *outfp)
 736 {
 737         /*
 738          * Print the terminating, NULL entry.
 739          */
 740         fprintf(outfp, "{\n");
 741         fprintf(outfp, "\t.cpuid = 0,\n");
 742         fprintf(outfp, "\t.version = 0,\n");
 743         fprintf(outfp, "\t.type = 0,\n");
 744         fprintf(outfp, "\t.table = 0,\n");
 745         fprintf(outfp, "},\n");
 746
 747         /* and finally, the closing curly bracket for the struct */
 748         fprintf(outfp, "};\n");
 749 }
 750
 751 static int process_mapfile(FILE *outfp, char *fpath)
 752 {
 753         int n = 16384;
 754         FILE *mapfp;
 755         char *save = NULL;
 756         char *line, *p;
 757         int line_num;
 758         char *tblname;
 759
 760         pr_info("%s: Processing mapfile %s\n", prog, fpath);
 761
 762         line = malloc(n);
 763         if (!line)
 764                 return -1;
 765
 766         mapfp = fopen(fpath, "r");
 767         if (!mapfp) {
 768                 pr_info("%s: Error %s opening %s\n", prog, strerror(errno),
 769                                 fpath);
 770                 return -1;
 771         }
 772
 773         print_mapping_table_prefix(outfp);
 774
 775         /* Skip first line (header) */
 776         p = fgets(line, n, mapfp);
 777         if (!p)
 778                 goto out;
 779
 780         line_num = 1;
 781         while (1) {
 782                 char *cpuid, *version, *type, *fname;
 783
 784                 line_num++;
 785                 p = fgets(line, n, mapfp);
 786                 if (!p)
 787                         break;
 788
 789                 if (line[0] == '#' || line[0] == '\n')
 790                         continue;
 791
 792                 if (line[strlen(line)-1] != '\n') {
 793                         /* TODO Deal with lines longer than 16K */
 794                         pr_info("%s: Mapfile %s: line %d too long, aborting\n",
 795                                         prog, fpath, line_num);
 796                         return -1;
 797                 }
 798                 line[strlen(line)-1] = '\0';
 799
 800                 cpuid = fixregex(strtok_r(p, ",", &save));
 801                 version = strtok_r(NULL, ",", &save);
 802                 fname = strtok_r(NULL, ",", &save);
 803                 type = strtok_r(NULL, ",", &save);
 804
 805                 tblname = file_name_to_table_name(fname);
 806                 fprintf(outfp, "{\n");
 807                 fprintf(outfp, "\t.cpuid = \"%s\",\n", cpuid);
 808                 fprintf(outfp, "\t.version = \"%s\",\n", version);
 809                 fprintf(outfp, "\t.type = \"%s\",\n", type);
 810
 811                 /*
 812                  * CHECK: We can't use the type (eg "core") field in the
 813                  * table name. For us to do that, we need to somehow tweak
 814                  * the other caller of file_name_to_table(), process_json()
 815                  * to determine the type. process_json() file has no way
 816                  * of knowing these are "core" events unless file name has
 817                  * core in it. If filename has core in it, we can safely
 818                  * ignore the type field here also.
 819                  */
 820                 fprintf(outfp, "\t.table = %s\n", tblname);
 821                 fprintf(outfp, "},\n");
 822         }
 823
 824 out:
 825         print_mapping_table_suffix(outfp);
 826         return 0;
 827 }
 828
 829 /*
 830  * If we fail to locate/process JSON and map files, create a NULL mapping
 831  * table. This would at least allow perf to build even if we can't find/use
 832  * the aliases.
 833  */
 834 static void create_empty_mapping(const char *output_file)
 835 {
 836         FILE *outfp;
 837
 838         pr_info("%s: Creating empty pmu_events_map[] table\n", prog);
 839
 840         /* Truncate file to clear any partial writes to it */
 841         outfp = fopen(output_file, "w");
 842         if (!outfp) {
 843                 perror("fopen()");
 844                 _Exit(1);
 845         }
 846
 847         fprintf(outfp, "#include \"pmu-events/pmu-events.h\"\n");
 848         print_mapping_table_prefix(outfp);
 849         print_mapping_table_suffix(outfp);
 850         fclose(outfp);
 851 }
 852
 853 static int get_maxfds(void)
 854 {
 855         struct rlimit rlim;
 856
 857         if (getrlimit(RLIMIT_NOFILE, &rlim) == 0)
 858                 return min((int)rlim.rlim_max / 2, 512);
 859
 860         return 512;
 861 }
 862
 863 /*
 864  * nftw() doesn't let us pass an argument to the processing function,
 865  * so use a global variables.
 866  */
 867 static FILE *eventsfp;
 868 static char *mapfile;
 869
 870 static int is_leaf_dir(const char *fpath)
 871 {
 872         DIR *d;
 873         struct dirent *dir;
 874         int res = 1;
 875
 876         d = opendir(fpath);
 877         if (!d)
 878                 return 0;
 879
 880         while ((dir = readdir(d)) != NULL) {
 881                 if (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, ".."))
 882                         continue;
 883
 884                 if (dir->d_type == DT_DIR) {
 885                         res = 0;
 886                         break;
 887                 } else if (dir->d_type == DT_UNKNOWN) {
 888                         char path[PATH_MAX];
 889                         struct stat st;
 890
 891                         sprintf(path, "%s/%s", fpath, dir->d_name);
 892                         if (stat(path, &st))
 893                                 break;
 894
 895                         if (S_ISDIR(st.st_mode)) {
 896                                 res = 0;
 897                                 break;
 898                         }
 899                 }
 900         }
 901
 902         closedir(d);
 903
 904         return res;
 905 }
 906
 907 static int is_json_file(const char *name)
 908 {
 909         const char *suffix;
 910
 911         if (strlen(name) < 5)
 912                 return 0;
 913
 914         suffix = name + strlen(name) - 5;
 915
 916         if (strncmp(suffix, ".json", 5) == 0)
 917                 return 1;
 918         return 0;
 919 }
 920
 921 static int preprocess_arch_std_files(const char *fpath, const struct stat *sb,
 922                                 int typeflag, struct FTW *ftwbuf)
 923 {
 924         int level = ftwbuf->level;
 925         int is_file = typeflag == FTW_F;
 926
 927         if (level == 1 && is_file && is_json_file(fpath))
 928                 return json_events(fpath, save_arch_std_events, (void *)sb);
 929
 930         return 0;
 931 }
 932
 933 static int process_one_file(const char *fpath, const struct stat *sb,
 934                             int typeflag, struct FTW *ftwbuf)
 935 {
 936         char *tblname, *bname;
 937         int is_dir  = typeflag == FTW_D;
 938         int is_file = typeflag == FTW_F;
 939         int level   = ftwbuf->level;
 940         int err = 0;
 941
 942         if (level == 2 && is_dir) {
 943                 /*
 944                  * For level 2 directory, bname will include parent name,
 945                  * like vendor/platform. So search back from platform dir
 946                  * to find this.
 947                  */
 948                 bname = (char *) fpath + ftwbuf->base - 2;
 949                 for (;;) {
 950                         if (*bname == '/')
 951                                 break;
 952                         bname--;
 953                 }
 954                 bname++;
 955         } else
 956                 bname = (char *) fpath + ftwbuf->base;
 957
 958         pr_debug("%s %d %7jd %-20s %s\n",
 959                  is_file ? "f" : is_dir ? "d" : "x",
 960                  level, sb->st_size, bname, fpath);
 961
 962         /* base dir or too deep */
 963         if (level == 0 || level > 3)
 964                 return 0;
 965
 966
 967         /* model directory, reset topic */
 968         if ((level == 1 && is_dir && is_leaf_dir(fpath)) ||
 969             (level == 2 && is_dir)) {
 970                 if (close_table)
 971                         print_events_table_suffix(eventsfp);
 972
 973                 /*
 974                  * Drop file name suffix. Replace hyphens with underscores.
 975                  * Fail if file name contains any alphanum characters besides
 976                  * underscores.
 977                  */
 978                 tblname = file_name_to_table_name(bname);
 979                 if (!tblname) {
 980                         pr_info("%s: Error determining table name for %s\n", prog,
 981                                 bname);
 982                         return -1;
 983                 }
 984
 985                 print_events_table_prefix(eventsfp, tblname);
 986                 return 0;
 987         }
 988
 989         /*
 990          * Save the mapfile name for now. We will process mapfile
 991          * after processing all JSON files (so we can write out the
 992          * mapping table after all PMU events tables).
 993          *
 994          */
 995         if (level == 1 && is_file) {
 996                 if (!strcmp(bname, "mapfile.csv")) {
 997                         mapfile = strdup(fpath);
 998                         return 0;
 999                 }
1000
1001                 pr_info("%s: Ignoring file %s\n", prog, fpath);
1002                 return 0;
1003         }
1004
1005         /*
1006          * If the file name does not have a .json extension,
1007          * ignore it. It could be a readme.txt for instance.
1008          */
1009         if (is_file) {
1010                 if (!is_json_file(bname)) {
1011                         pr_info("%s: Ignoring file without .json suffix %s\n", prog,
1012                                 fpath);
1013                         return 0;
1014                 }
1015         }
1016
1017         if (level > 1 && add_topic(bname))
1018                 return -ENOMEM;
1019
1020         /*
1021          * Assume all other files are JSON files.
1022          *
1023          * If mapfile refers to 'power7_core.json', we create a table
1024          * named 'power7_core'. Any inconsistencies between the mapfile
1025          * and directory tree could result in build failure due to table
1026          * names not being found.
1027          *
1028          * Atleast for now, be strict with processing JSON file names.
1029          * i.e. if JSON file name cannot be mapped to C-style table name,
1030          * fail.
1031          */
1032         if (is_file) {
1033                 struct perf_entry_data data = {
1034                         .topic = get_topic(),
1035                         .outfp = eventsfp,
1036                 };
1037
1038                 err = json_events(fpath, print_events_table_entry, &data);
1039
1040                 free(data.topic);
1041         }
1042
1043         return err;
1044 }
1045
1046 #ifndef PATH_MAX
1047 #define PATH_MAX        4096
1048 #endif
1049
1050 /*
1051  * Starting in directory 'start_dirname', find the "mapfile.csv" and
1052  * the set of JSON files for the architecture 'arch'.
1053  *
1054  * From each JSON file, create a C-style "PMU events table" from the
1055  * JSON file (see struct pmu_event).
1056  *
1057  * From the mapfile, create a mapping between the CPU revisions and
1058  * PMU event tables (see struct pmu_events_map).
1059  *
1060  * Write out the PMU events tables and the mapping table to pmu-event.c.
1061  */
1062 int main(int argc, char *argv[])
1063 {
1064         int rc;
1065         int maxfds;
1066         char ldirname[PATH_MAX];
1067
1068         const char *arch;
1069         const char *output_file;
1070         const char *start_dirname;
1071         struct stat stbuf;
1072
1073         prog = basename(argv[0]);
1074         if (argc < 4) {
1075                 pr_err("Usage: %s <arch> <starting_dir> <output_file>\n", prog);
1076                 return 1;
1077         }
1078
1079         arch = argv[1];
1080         start_dirname = argv[2];
1081         output_file = argv[3];
1082
1083         if (argc > 4)
1084                 verbose = atoi(argv[4]);
1085
1086         eventsfp = fopen(output_file, "w");
1087         if (!eventsfp) {
1088                 pr_err("%s Unable to create required file %s (%s)\n",
1089                                 prog, output_file, strerror(errno));
1090                 return 2;
1091         }
1092
1093         sprintf(ldirname, "%s/%s", start_dirname, arch);
1094
1095         /* If architecture does not have any event lists, bail out */
1096         if (stat(ldirname, &stbuf) < 0) {
1097                 pr_info("%s: Arch %s has no PMU event lists\n", prog, arch);
1098                 goto empty_map;
1099         }
1100
1101         /* Include pmu-events.h first */
1102         fprintf(eventsfp, "#include \"pmu-events/pmu-events.h\"\n");
1103
1104         /*
1105          * The mapfile allows multiple CPUids to point to the same JSON file,
1106          * so, not sure if there is a need for symlinks within the pmu-events
1107          * directory.
1108          *
1109          * For now, treat symlinks of JSON files as regular files and create
1110          * separate tables for each symlink (presumably, each symlink refers
1111          * to specific version of the CPU).
1112          */
1113
1114         maxfds = get_maxfds();
1115         mapfile = NULL;
1116         rc = nftw(ldirname, preprocess_arch_std_files, maxfds, 0);
1117         if (rc && verbose) {
1118                 pr_info("%s: Error preprocessing arch standard files %s\n",
1119                         prog, ldirname);
1120                 goto empty_map;
1121         } else if (rc < 0) {
1122                 /* Make build fail */
1123                 free_arch_std_events();
1124                 return 1;
1125         } else if (rc) {
1126                 goto empty_map;
1127         }
1128
1129         rc = nftw(ldirname, process_one_file, maxfds, 0);
1130         if (rc && verbose) {
1131                 pr_info("%s: Error walking file tree %s\n", prog, ldirname);
1132                 goto empty_map;
1133         } else if (rc < 0) {
1134                 /* Make build fail */
1135                 free_arch_std_events();
1136                 return 1;
1137         } else if (rc) {
1138                 goto empty_map;
1139         }
1140
1141         if (close_table)
1142                 print_events_table_suffix(eventsfp);
1143
1144         if (!mapfile) {
1145                 pr_info("%s: No CPU->JSON mapping?\n", prog);
1146                 goto empty_map;
1147         }
1148
1149         if (process_mapfile(eventsfp, mapfile)) {
1150                 pr_info("%s: Error processing mapfile %s\n", prog, mapfile);
1151                 /* Make build fail */
1152                 return 1;
1153         }
1154
1155         return 0;
1156
1157 empty_map:
1158         fclose(eventsfp);
1159         create_empty_mapping(output_file);
1160         free_arch_std_events();
1161         return 0;
1162 }