1 #define _XOPEN_SOURCE 500 /* needed for nftw() */
2 #define _GNU_SOURCE /* needed for asprintf() */
4 /* Parse event JSON files */
7 * Copyright (c) 2014, Intel Corporation
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions are met:
13 * 1. Redistributions of source code must retain the above copyright notice,
14 * this list of conditions and the following disclaimer.
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.
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.
43 #include <sys/time.h> /* getrlimit */
44 #include <sys/resource.h> /* getrlimit */
51 #ifndef __maybe_unused
52 #define __maybe_unused __attribute__((unused))
58 int eprintf(int level, int var, const char *fmt, ...)
69 ret = vfprintf(stderr, fmt, args);
76 __attribute__((weak)) char *get_cpu_str(void)
81 static void addfield(char *map, char **dst, const char *sep,
82 const char *a, jsmntok_t *bt)
84 unsigned int len = strlen(a) + 1 + strlen(sep);
85 int olen = *dst ? strlen(*dst) : 0;
86 int blen = bt ? json_len(bt) : 0;
89 out = realloc(*dst, len + olen + blen);
91 /* Don't add field in this case */
102 strncat(*dst, map + bt->start, blen);
105 static void fixname(char *s)
111 static void fixdesc(char *s)
113 char *e = s + strlen(s);
115 /* Remove trailing dots that look ugly in perf list */
117 while (e >= s && isspace(*e))
123 static struct msrmap {
127 { "0x3F6", "ldlat=" },
128 { "0x1A6", "offcore_rsp=" },
129 { "0x1A7", "offcore_rsp=" },
130 { "0x3F7", "frontend=" },
134 static struct field {
138 { "UMask", "umask=" },
139 { "CounterMask", "cmask=" },
140 { "Invert", "inv=" },
141 { "AnyThread", "any=" },
142 { "EdgeDetect", "edge=" },
143 { "SampleAfterValue", "period=" },
147 static void cut_comma(char *map, jsmntok_t *newval)
151 /* Cut off everything after comma */
152 for (i = newval->start; i < newval->end; i++) {
158 static int match_field(char *map, jsmntok_t *field, int nz,
159 char **event, jsmntok_t *val)
162 jsmntok_t newval = *val;
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);
173 static struct msrmap *lookup_msr(char *map, jsmntok_t *val)
175 jsmntok_t newval = *val;
179 cut_comma(map, &newval);
180 for (i = 0; msrmap[i].num; i++)
181 if (json_streq(map, &newval, msrmap[i].num))
185 pr_err("%s: Unknown MSR in event file %.*s\n", prog,
186 json_len(val), map + val->start);
191 #define EXPECT(e, t, m) do { if (!(e)) { \
192 jsmntok_t *loc = (t); \
193 if (!(t)->start && (t) > tokens) \
195 pr_err("%s:%d: " m ", got %s\n", fn, \
196 json_line(map, loc), \
201 #define TOPIC_DEPTH 256
202 static char *topic_array[TOPIC_DEPTH];
203 static int topic_level;
205 static char *get_topic(void)
207 char *tp_old, *tp = NULL;
210 for (i = 0; i < topic_level + 1; i++) {
214 n = asprintf(&tp, "%s%s", tp ?: "", topic_array[i]);
216 pr_info("%s: asprintf() error %s\n", prog);
222 for (i = 0; i < (int) strlen(tp); i++) {
236 static int add_topic(int level, char *bname)
242 if (level >= TOPIC_DEPTH)
245 topic = strdup(bname);
247 pr_info("%s: strdup() error %s for file %s\n", prog,
248 strerror(errno), bname);
252 free(topic_array[topic_level]);
253 topic_array[topic_level] = topic;
258 struct perf_entry_data {
263 static int close_table;
265 static void print_events_table_prefix(FILE *fp, const char *tblname)
267 fprintf(fp, "struct pmu_event %s[] = {\n", tblname);
271 static int print_events_table_entry(void *data, char *name, char *event,
272 char *desc, char *long_desc)
274 struct perf_entry_data *pd = data;
275 FILE *outfp = pd->outfp;
276 char *topic = pd->topic;
279 * TODO: Remove formatting chars after debugging to reduce
282 fprintf(outfp, "{\n");
284 fprintf(outfp, "\t.name = \"%s\",\n", name);
285 fprintf(outfp, "\t.event = \"%s\",\n", event);
286 fprintf(outfp, "\t.desc = \"%s\",\n", desc);
287 fprintf(outfp, "\t.topic = \"%s\",\n", topic);
288 if (long_desc && long_desc[0])
289 fprintf(outfp, "\t.long_desc = \"%s\",\n", long_desc);
291 fprintf(outfp, "},\n");
296 static void print_events_table_suffix(FILE *outfp)
298 fprintf(outfp, "{\n");
300 fprintf(outfp, "\t.name = 0,\n");
301 fprintf(outfp, "\t.event = 0,\n");
302 fprintf(outfp, "\t.desc = 0,\n");
304 fprintf(outfp, "},\n");
305 fprintf(outfp, "};\n");
309 static struct fixed {
313 { "inst_retired.any", "event=0xc0" },
314 { "inst_retired.any_p", "event=0xc0" },
315 { "cpu_clk_unhalted.ref", "event=0x0,umask=0x03" },
316 { "cpu_clk_unhalted.thread", "event=0x3c" },
317 { "cpu_clk_unhalted.thread_any", "event=0x3c,any=1" },
322 * Handle different fixed counter encodings between JSON and perf.
324 static char *real_event(const char *name, char *event)
328 for (i = 0; fixed[i].name; i++)
329 if (!strcasecmp(name, fixed[i].name))
330 return (char *)fixed[i].event;
334 /* Call func with each event in the json file */
335 int json_events(const char *fn,
336 int (*func)(void *data, char *name, char *event, char *desc,
342 jsmntok_t *tokens, *tok;
350 tokens = parse_json(fn, &map, &size, &len);
353 EXPECT(tokens->type == JSMN_ARRAY, tokens, "expected top level array");
355 for (i = 0; i < tokens->size; i++) {
356 char *event = NULL, *desc = NULL, *name = NULL;
357 char *long_desc = NULL;
358 char *extra_desc = NULL;
359 unsigned long long eventcode = 0;
360 struct msrmap *msr = NULL;
361 jsmntok_t *msrval = NULL;
362 jsmntok_t *precise = NULL;
363 jsmntok_t *obj = tok++;
365 EXPECT(obj->type == JSMN_OBJECT, obj, "expected object");
366 for (j = 0; j < obj->size; j += 2) {
367 jsmntok_t *field, *val;
371 EXPECT(field->type == JSMN_STRING, tok + j,
372 "Expected field name");
374 EXPECT(val->type == JSMN_STRING, tok + j + 1,
375 "Expected string value");
377 nz = !json_streq(map, val, "0");
378 if (match_field(map, field, nz, &event, val)) {
380 } else if (json_streq(map, field, "EventCode")) {
382 addfield(map, &code, "", "", val);
383 eventcode |= strtoul(code, NULL, 0);
385 } else if (json_streq(map, field, "EventName")) {
386 addfield(map, &name, "", "", val);
387 } else if (json_streq(map, field, "BriefDescription")) {
388 addfield(map, &desc, "", "", val);
390 } else if (json_streq(map, field,
391 "PublicDescription")) {
392 addfield(map, &long_desc, "", "", val);
394 } else if (json_streq(map, field, "PEBS") && nz) {
396 } else if (json_streq(map, field, "MSRIndex") && nz) {
397 msr = lookup_msr(map, val);
398 } else if (json_streq(map, field, "MSRValue")) {
400 } else if (json_streq(map, field, "Errata") &&
401 !json_streq(map, val, "null")) {
402 addfield(map, &extra_desc, ". ",
403 " Spec update: ", val);
404 } else if (json_streq(map, field, "Data_LA") && nz) {
405 addfield(map, &extra_desc, ". ",
406 " Supports address when precise",
409 /* ignore unknown fields */
411 if (precise && desc && !strstr(desc, "(Precise Event)")) {
412 if (json_streq(map, precise, "2"))
413 addfield(map, &extra_desc, " ",
414 "(Must be precise)", NULL);
416 addfield(map, &extra_desc, " ",
417 "(Precise event)", NULL);
419 snprintf(buf, sizeof buf, "event=%#llx", eventcode);
420 addfield(map, &event, ",", buf, NULL);
421 if (desc && extra_desc)
422 addfield(map, &desc, " ", extra_desc, NULL);
423 if (long_desc && extra_desc)
424 addfield(map, &long_desc, " ", extra_desc, NULL);
426 addfield(map, &event, ",", msr->pname, msrval);
429 err = func(data, name, real_event(name, event), desc, long_desc);
439 EXPECT(tok - tokens == len, tok, "unexpected objects at end");
442 free_json(map, size, tokens);
446 static char *file_name_to_table_name(char *fname)
454 * Ensure tablename starts with alphabetic character.
455 * Derive rest of table name from basename of the JSON file,
456 * replacing hyphens and stripping out .json suffix.
458 n = asprintf(&tblname, "pme_%s", basename(fname));
460 pr_info("%s: asprintf() error %s for file %s\n", prog,
461 strerror(errno), fname);
465 for (i = 0; i < strlen(tblname); i++) {
473 } else if (!isalnum(c) && c != '_') {
474 pr_err("%s: Invalid character '%c' in file name %s\n",
475 prog, c, basename(fname));
485 static void print_mapping_table_prefix(FILE *outfp)
487 fprintf(outfp, "struct pmu_events_map pmu_events_map[] = {\n");
490 static void print_mapping_table_suffix(FILE *outfp)
493 * Print the terminating, NULL entry.
495 fprintf(outfp, "{\n");
496 fprintf(outfp, "\t.cpuid = 0,\n");
497 fprintf(outfp, "\t.version = 0,\n");
498 fprintf(outfp, "\t.type = 0,\n");
499 fprintf(outfp, "\t.table = 0,\n");
500 fprintf(outfp, "},\n");
502 /* and finally, the closing curly bracket for the struct */
503 fprintf(outfp, "};\n");
506 static int process_mapfile(FILE *outfp, char *fpath)
515 pr_info("%s: Processing mapfile %s\n", prog, fpath);
521 mapfp = fopen(fpath, "r");
523 pr_info("%s: Error %s opening %s\n", prog, strerror(errno),
528 print_mapping_table_prefix(outfp);
530 /* Skip first line (header) */
531 p = fgets(line, n, mapfp);
537 char *cpuid, *version, *type, *fname;
540 p = fgets(line, n, mapfp);
544 if (line[0] == '#' || line[0] == '\n')
547 if (line[strlen(line)-1] != '\n') {
548 /* TODO Deal with lines longer than 16K */
549 pr_info("%s: Mapfile %s: line %d too long, aborting\n",
550 prog, fpath, line_num);
553 line[strlen(line)-1] = '\0';
555 cpuid = strtok_r(p, ",", &save);
556 version = strtok_r(NULL, ",", &save);
557 fname = strtok_r(NULL, ",", &save);
558 type = strtok_r(NULL, ",", &save);
560 tblname = file_name_to_table_name(fname);
561 fprintf(outfp, "{\n");
562 fprintf(outfp, "\t.cpuid = \"%s\",\n", cpuid);
563 fprintf(outfp, "\t.version = \"%s\",\n", version);
564 fprintf(outfp, "\t.type = \"%s\",\n", type);
567 * CHECK: We can't use the type (eg "core") field in the
568 * table name. For us to do that, we need to somehow tweak
569 * the other caller of file_name_to_table(), process_json()
570 * to determine the type. process_json() file has no way
571 * of knowing these are "core" events unless file name has
572 * core in it. If filename has core in it, we can safely
573 * ignore the type field here also.
575 fprintf(outfp, "\t.table = %s\n", tblname);
576 fprintf(outfp, "},\n");
580 print_mapping_table_suffix(outfp);
585 * If we fail to locate/process JSON and map files, create a NULL mapping
586 * table. This would at least allow perf to build even if we can't find/use
589 static void create_empty_mapping(const char *output_file)
593 pr_info("%s: Creating empty pmu_events_map[] table\n", prog);
595 /* Truncate file to clear any partial writes to it */
596 outfp = fopen(output_file, "w");
602 fprintf(outfp, "#include \"../../pmu-events/pmu-events.h\"\n");
603 print_mapping_table_prefix(outfp);
604 print_mapping_table_suffix(outfp);
608 static int get_maxfds(void)
612 if (getrlimit(RLIMIT_NOFILE, &rlim) == 0)
613 return min((int)rlim.rlim_max / 2, 512);
619 * nftw() doesn't let us pass an argument to the processing function,
620 * so use a global variables.
622 static FILE *eventsfp;
623 static char *mapfile;
625 static int process_one_file(const char *fpath, const struct stat *sb,
626 int typeflag, struct FTW *ftwbuf)
628 char *tblname, *bname = (char *) fpath + ftwbuf->base;
629 int is_dir = typeflag == FTW_D;
630 int is_file = typeflag == FTW_F;
631 int level = ftwbuf->level;
634 pr_debug("%s %d %7jd %-20s %s\n",
635 is_file ? "f" : is_dir ? "d" : "x",
636 level, sb->st_size, bname, fpath);
642 /* model directory, reset topic */
643 if (level == 1 && is_dir) {
645 print_events_table_suffix(eventsfp);
648 * Drop file name suffix. Replace hyphens with underscores.
649 * Fail if file name contains any alphanum characters besides
652 tblname = file_name_to_table_name(bname);
654 pr_info("%s: Error determining table name for %s\n", prog,
659 print_events_table_prefix(eventsfp, tblname);
664 * Save the mapfile name for now. We will process mapfile
665 * after processing all JSON files (so we can write out the
666 * mapping table after all PMU events tables).
668 * TODO: Allow for multiple mapfiles? Punt for now.
670 if (level == 1 && is_file) {
671 if (!strncmp(bname, "mapfile.csv", 11)) {
673 pr_info("%s: Many mapfiles? Using %s, ignoring %s\n",
674 prog, mapfile, fpath);
676 mapfile = strdup(fpath);
681 pr_info("%s: Ignoring file %s\n", prog, fpath);
686 * If the file name does not have a .json extension,
687 * ignore it. It could be a readme.txt for instance.
690 char *suffix = bname + strlen(bname) - 5;
692 if (strncmp(suffix, ".json", 5)) {
693 pr_info("%s: Ignoring file without .json suffix %s\n", prog,
699 if (level > 1 && add_topic(level, bname))
703 * Assume all other files are JSON files.
705 * If mapfile refers to 'power7_core.json', we create a table
706 * named 'power7_core'. Any inconsistencies between the mapfile
707 * and directory tree could result in build failure due to table
708 * names not being found.
710 * Atleast for now, be strict with processing JSON file names.
711 * i.e. if JSON file name cannot be mapped to C-style table name,
715 struct perf_entry_data data = {
716 .topic = get_topic(),
720 err = json_events(fpath, print_events_table_entry, &data);
729 #define PATH_MAX 4096
733 * Starting in directory 'start_dirname', find the "mapfile.csv" and
734 * the set of JSON files for the architecture 'arch'.
736 * From each JSON file, create a C-style "PMU events table" from the
737 * JSON file (see struct pmu_event).
739 * From the mapfile, create a mapping between the CPU revisions and
740 * PMU event tables (see struct pmu_events_map).
742 * Write out the PMU events tables and the mapping table to pmu-event.c.
744 * If unable to process the JSON or arch files, create an empty mapping
745 * table so we can continue to build/use perf even if we cannot use the
748 int main(int argc, char *argv[])
752 char ldirname[PATH_MAX];
755 const char *output_file;
756 const char *start_dirname;
758 prog = basename(argv[0]);
760 pr_err("Usage: %s <arch> <starting_dir> <output_file>\n", prog);
765 start_dirname = argv[2];
766 output_file = argv[3];
769 verbose = atoi(argv[4]);
771 eventsfp = fopen(output_file, "w");
773 pr_err("%s Unable to create required file %s (%s)\n",
774 prog, output_file, strerror(errno));
778 /* Include pmu-events.h first */
779 fprintf(eventsfp, "#include \"../../pmu-events/pmu-events.h\"\n");
781 sprintf(ldirname, "%s/%s", start_dirname, arch);
784 * The mapfile allows multiple CPUids to point to the same JSON file,
785 * so, not sure if there is a need for symlinks within the pmu-events
788 * For now, treat symlinks of JSON files as regular files and create
789 * separate tables for each symlink (presumably, each symlink refers
790 * to specific version of the CPU).
793 maxfds = get_maxfds();
795 rc = nftw(ldirname, process_one_file, maxfds, 0);
797 pr_info("%s: Error walking file tree %s\n", prog, ldirname);
804 print_events_table_suffix(eventsfp);
807 pr_info("%s: No CPU->JSON mapping?\n", prog);
811 if (process_mapfile(eventsfp, mapfile)) {
812 pr_info("%s: Error processing mapfile %s\n", prog, mapfile);
820 create_empty_mapping(output_file);