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794ba54a83
Implement support in jevents to parse long descriptions for events that may have them in the JSON files. A follow on patch will make this long description available to user through the 'perf list' command. Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Acked-by: Ingo Molnar <mingo@kernel.org> Acked-by: Jiri Olsa <jolsa@redhat.com> Cc: Madhavan Srinivasan <maddy@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: linuxppc-dev@lists.ozlabs.org Link: http://lkml.kernel.org/r/1473978296-20712-11-git-send-email-sukadev@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
789 lines
18 KiB
C
789 lines
18 KiB
C
#define _XOPEN_SOURCE 500 /* needed for nftw() */
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#define _GNU_SOURCE /* needed for asprintf() */
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/* Parse event JSON files */
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/*
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* Copyright (c) 2014, Intel Corporation
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <stdarg.h>
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#include <libgen.h>
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#include <dirent.h>
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#include <sys/time.h> /* getrlimit */
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#include <sys/resource.h> /* getrlimit */
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#include <ftw.h>
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#include <sys/stat.h>
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#include "jsmn.h"
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#include "json.h"
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#include "jevents.h"
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#ifndef __maybe_unused
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#define __maybe_unused __attribute__((unused))
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#endif
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int verbose;
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char *prog;
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int eprintf(int level, int var, const char *fmt, ...)
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{
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int ret;
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va_list args;
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if (var < level)
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return 0;
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va_start(args, fmt);
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ret = vfprintf(stderr, fmt, args);
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va_end(args);
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return ret;
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}
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__attribute__((weak)) char *get_cpu_str(void)
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{
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return NULL;
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}
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static void addfield(char *map, char **dst, const char *sep,
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const char *a, jsmntok_t *bt)
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{
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unsigned int len = strlen(a) + 1 + strlen(sep);
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int olen = *dst ? strlen(*dst) : 0;
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int blen = bt ? json_len(bt) : 0;
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char *out;
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out = realloc(*dst, len + olen + blen);
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if (!out) {
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/* Don't add field in this case */
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return;
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}
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*dst = out;
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if (!olen)
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*(*dst) = 0;
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else
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strcat(*dst, sep);
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strcat(*dst, a);
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if (bt)
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strncat(*dst, map + bt->start, blen);
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}
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static void fixname(char *s)
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{
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for (; *s; s++)
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*s = tolower(*s);
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}
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static void fixdesc(char *s)
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{
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char *e = s + strlen(s);
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/* Remove trailing dots that look ugly in perf list */
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--e;
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while (e >= s && isspace(*e))
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--e;
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if (*e == '.')
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*e = 0;
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}
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static struct msrmap {
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const char *num;
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const char *pname;
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} msrmap[] = {
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{ "0x3F6", "ldlat=" },
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{ "0x1A6", "offcore_rsp=" },
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{ "0x1A7", "offcore_rsp=" },
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{ NULL, NULL }
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};
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static struct field {
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const char *field;
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const char *kernel;
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} fields[] = {
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{ "EventCode", "event=" },
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{ "UMask", "umask=" },
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{ "CounterMask", "cmask=" },
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{ "Invert", "inv=" },
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{ "AnyThread", "any=" },
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{ "EdgeDetect", "edge=" },
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{ "SampleAfterValue", "period=" },
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{ NULL, NULL }
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};
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static void cut_comma(char *map, jsmntok_t *newval)
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{
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int i;
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/* Cut off everything after comma */
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for (i = newval->start; i < newval->end; i++) {
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if (map[i] == ',')
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newval->end = i;
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}
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}
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static int match_field(char *map, jsmntok_t *field, int nz,
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char **event, jsmntok_t *val)
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{
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struct field *f;
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jsmntok_t newval = *val;
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for (f = fields; f->field; f++)
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if (json_streq(map, field, f->field) && nz) {
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cut_comma(map, &newval);
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addfield(map, event, ",", f->kernel, &newval);
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return 1;
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}
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return 0;
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}
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static struct msrmap *lookup_msr(char *map, jsmntok_t *val)
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{
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jsmntok_t newval = *val;
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static bool warned;
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int i;
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cut_comma(map, &newval);
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for (i = 0; msrmap[i].num; i++)
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if (json_streq(map, &newval, msrmap[i].num))
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return &msrmap[i];
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if (!warned) {
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warned = true;
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pr_err("%s: Unknown MSR in event file %.*s\n", prog,
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json_len(val), map + val->start);
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}
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return NULL;
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}
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#define EXPECT(e, t, m) do { if (!(e)) { \
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jsmntok_t *loc = (t); \
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if (!(t)->start && (t) > tokens) \
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loc = (t) - 1; \
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pr_err("%s:%d: " m ", got %s\n", fn, \
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json_line(map, loc), \
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json_name(t)); \
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goto out_free; \
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} } while (0)
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#define TOPIC_DEPTH 256
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static char *topic_array[TOPIC_DEPTH];
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static int topic_level;
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static char *get_topic(void)
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{
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char *tp_old, *tp = NULL;
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int i;
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for (i = 0; i < topic_level + 1; i++) {
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int n;
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tp_old = tp;
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n = asprintf(&tp, "%s%s", tp ?: "", topic_array[i]);
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if (n < 0) {
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pr_info("%s: asprintf() error %s\n", prog);
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return NULL;
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}
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free(tp_old);
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}
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for (i = 0; i < (int) strlen(tp); i++) {
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char c = tp[i];
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if (c == '-')
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tp[i] = ' ';
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else if (c == '.') {
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tp[i] = '\0';
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break;
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}
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}
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return tp;
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}
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static int add_topic(int level, char *bname)
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{
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char *topic;
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level -= 2;
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if (level >= TOPIC_DEPTH)
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return -EINVAL;
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topic = strdup(bname);
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if (!topic) {
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pr_info("%s: strdup() error %s for file %s\n", prog,
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strerror(errno), bname);
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return -ENOMEM;
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}
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free(topic_array[topic_level]);
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topic_array[topic_level] = topic;
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topic_level = level;
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return 0;
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}
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struct perf_entry_data {
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FILE *outfp;
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char *topic;
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};
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static int close_table;
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static void print_events_table_prefix(FILE *fp, const char *tblname)
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{
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fprintf(fp, "struct pmu_event %s[] = {\n", tblname);
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close_table = 1;
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}
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static int print_events_table_entry(void *data, char *name, char *event,
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char *desc, char *long_desc)
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{
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struct perf_entry_data *pd = data;
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FILE *outfp = pd->outfp;
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char *topic = pd->topic;
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/*
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* TODO: Remove formatting chars after debugging to reduce
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* string lengths.
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*/
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fprintf(outfp, "{\n");
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fprintf(outfp, "\t.name = \"%s\",\n", name);
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fprintf(outfp, "\t.event = \"%s\",\n", event);
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fprintf(outfp, "\t.desc = \"%s\",\n", desc);
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fprintf(outfp, "\t.topic = \"%s\",\n", topic);
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if (long_desc && long_desc[0])
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fprintf(outfp, "\t.long_desc = \"%s\",\n", long_desc);
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fprintf(outfp, "},\n");
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return 0;
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}
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static void print_events_table_suffix(FILE *outfp)
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{
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fprintf(outfp, "{\n");
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fprintf(outfp, "\t.name = 0,\n");
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fprintf(outfp, "\t.event = 0,\n");
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fprintf(outfp, "\t.desc = 0,\n");
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fprintf(outfp, "},\n");
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fprintf(outfp, "};\n");
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close_table = 0;
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}
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/* Call func with each event in the json file */
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int json_events(const char *fn,
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int (*func)(void *data, char *name, char *event, char *desc,
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char *long_desc),
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void *data)
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{
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int err = -EIO;
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size_t size;
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jsmntok_t *tokens, *tok;
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int i, j, len;
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char *map;
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if (!fn)
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return -ENOENT;
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tokens = parse_json(fn, &map, &size, &len);
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if (!tokens)
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return -EIO;
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EXPECT(tokens->type == JSMN_ARRAY, tokens, "expected top level array");
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tok = tokens + 1;
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for (i = 0; i < tokens->size; i++) {
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char *event = NULL, *desc = NULL, *name = NULL;
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char *long_desc = NULL;
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char *extra_desc = NULL;
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struct msrmap *msr = NULL;
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jsmntok_t *msrval = NULL;
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jsmntok_t *precise = NULL;
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jsmntok_t *obj = tok++;
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EXPECT(obj->type == JSMN_OBJECT, obj, "expected object");
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for (j = 0; j < obj->size; j += 2) {
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jsmntok_t *field, *val;
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int nz;
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field = tok + j;
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EXPECT(field->type == JSMN_STRING, tok + j,
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"Expected field name");
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val = tok + j + 1;
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EXPECT(val->type == JSMN_STRING, tok + j + 1,
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"Expected string value");
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nz = !json_streq(map, val, "0");
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if (match_field(map, field, nz, &event, val)) {
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/* ok */
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} else if (json_streq(map, field, "EventName")) {
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addfield(map, &name, "", "", val);
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} else if (json_streq(map, field, "BriefDescription")) {
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addfield(map, &desc, "", "", val);
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fixdesc(desc);
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} else if (json_streq(map, field,
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"PublicDescription")) {
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addfield(map, &long_desc, "", "", val);
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fixdesc(long_desc);
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} else if (json_streq(map, field, "PEBS") && nz) {
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precise = val;
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} else if (json_streq(map, field, "MSRIndex") && nz) {
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msr = lookup_msr(map, val);
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} else if (json_streq(map, field, "MSRValue")) {
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msrval = val;
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} else if (json_streq(map, field, "Errata") &&
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!json_streq(map, val, "null")) {
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addfield(map, &extra_desc, ". ",
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" Spec update: ", val);
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} else if (json_streq(map, field, "Data_LA") && nz) {
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addfield(map, &extra_desc, ". ",
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" Supports address when precise",
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NULL);
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}
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/* ignore unknown fields */
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}
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if (precise && desc && !strstr(desc, "(Precise Event)")) {
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if (json_streq(map, precise, "2"))
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addfield(map, &extra_desc, " ",
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"(Must be precise)", NULL);
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else
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addfield(map, &extra_desc, " ",
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"(Precise event)", NULL);
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}
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if (desc && extra_desc)
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addfield(map, &desc, " ", extra_desc, NULL);
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if (long_desc && extra_desc)
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addfield(map, &long_desc, " ", extra_desc, NULL);
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if (msr != NULL)
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addfield(map, &event, ",", msr->pname, msrval);
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fixname(name);
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err = func(data, name, event, desc, long_desc);
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free(event);
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free(desc);
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free(name);
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free(long_desc);
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free(extra_desc);
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if (err)
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break;
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tok += j;
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}
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EXPECT(tok - tokens == len, tok, "unexpected objects at end");
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err = 0;
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out_free:
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free_json(map, size, tokens);
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return err;
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}
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static char *file_name_to_table_name(char *fname)
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{
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unsigned int i;
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int n;
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int c;
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char *tblname;
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/*
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* Ensure tablename starts with alphabetic character.
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* Derive rest of table name from basename of the JSON file,
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* replacing hyphens and stripping out .json suffix.
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*/
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n = asprintf(&tblname, "pme_%s", basename(fname));
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if (n < 0) {
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pr_info("%s: asprintf() error %s for file %s\n", prog,
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strerror(errno), fname);
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return NULL;
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}
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for (i = 0; i < strlen(tblname); i++) {
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c = tblname[i];
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if (c == '-')
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tblname[i] = '_';
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else if (c == '.') {
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tblname[i] = '\0';
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break;
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} else if (!isalnum(c) && c != '_') {
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pr_err("%s: Invalid character '%c' in file name %s\n",
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prog, c, basename(fname));
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free(tblname);
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tblname = NULL;
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break;
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}
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}
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|
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return tblname;
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}
|
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|
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static void print_mapping_table_prefix(FILE *outfp)
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{
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fprintf(outfp, "struct pmu_events_map pmu_events_map[] = {\n");
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}
|
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|
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static void print_mapping_table_suffix(FILE *outfp)
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{
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/*
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* Print the terminating, NULL entry.
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*/
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fprintf(outfp, "{\n");
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fprintf(outfp, "\t.cpuid = 0,\n");
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fprintf(outfp, "\t.version = 0,\n");
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fprintf(outfp, "\t.type = 0,\n");
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fprintf(outfp, "\t.table = 0,\n");
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fprintf(outfp, "},\n");
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|
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/* and finally, the closing curly bracket for the struct */
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fprintf(outfp, "};\n");
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}
|
|
|
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static int process_mapfile(FILE *outfp, char *fpath)
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{
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int n = 16384;
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FILE *mapfp;
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char *save = NULL;
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char *line, *p;
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int line_num;
|
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char *tblname;
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|
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pr_info("%s: Processing mapfile %s\n", prog, fpath);
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|
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line = malloc(n);
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if (!line)
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return -1;
|
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|
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mapfp = fopen(fpath, "r");
|
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if (!mapfp) {
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pr_info("%s: Error %s opening %s\n", prog, strerror(errno),
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fpath);
|
|
return -1;
|
|
}
|
|
|
|
print_mapping_table_prefix(outfp);
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|
|
/* Skip first line (header) */
|
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p = fgets(line, n, mapfp);
|
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if (!p)
|
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goto out;
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|
|
line_num = 1;
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while (1) {
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char *cpuid, *version, *type, *fname;
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|
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line_num++;
|
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p = fgets(line, n, mapfp);
|
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if (!p)
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break;
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|
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if (line[0] == '#' || line[0] == '\n')
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continue;
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|
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if (line[strlen(line)-1] != '\n') {
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/* TODO Deal with lines longer than 16K */
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|
pr_info("%s: Mapfile %s: line %d too long, aborting\n",
|
|
prog, fpath, line_num);
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|
return -1;
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}
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|
line[strlen(line)-1] = '\0';
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|
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cpuid = strtok_r(p, ",", &save);
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version = strtok_r(NULL, ",", &save);
|
|
fname = strtok_r(NULL, ",", &save);
|
|
type = strtok_r(NULL, ",", &save);
|
|
|
|
tblname = file_name_to_table_name(fname);
|
|
fprintf(outfp, "{\n");
|
|
fprintf(outfp, "\t.cpuid = \"%s\",\n", cpuid);
|
|
fprintf(outfp, "\t.version = \"%s\",\n", version);
|
|
fprintf(outfp, "\t.type = \"%s\",\n", type);
|
|
|
|
/*
|
|
* CHECK: We can't use the type (eg "core") field in the
|
|
* table name. For us to do that, we need to somehow tweak
|
|
* the other caller of file_name_to_table(), process_json()
|
|
* to determine the type. process_json() file has no way
|
|
* of knowing these are "core" events unless file name has
|
|
* core in it. If filename has core in it, we can safely
|
|
* ignore the type field here also.
|
|
*/
|
|
fprintf(outfp, "\t.table = %s\n", tblname);
|
|
fprintf(outfp, "},\n");
|
|
}
|
|
|
|
out:
|
|
print_mapping_table_suffix(outfp);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If we fail to locate/process JSON and map files, create a NULL mapping
|
|
* table. This would at least allow perf to build even if we can't find/use
|
|
* the aliases.
|
|
*/
|
|
static void create_empty_mapping(const char *output_file)
|
|
{
|
|
FILE *outfp;
|
|
|
|
pr_info("%s: Creating empty pmu_events_map[] table\n", prog);
|
|
|
|
/* Truncate file to clear any partial writes to it */
|
|
outfp = fopen(output_file, "w");
|
|
if (!outfp) {
|
|
perror("fopen()");
|
|
_Exit(1);
|
|
}
|
|
|
|
fprintf(outfp, "#include \"../../pmu-events/pmu-events.h\"\n");
|
|
print_mapping_table_prefix(outfp);
|
|
print_mapping_table_suffix(outfp);
|
|
fclose(outfp);
|
|
}
|
|
|
|
static int get_maxfds(void)
|
|
{
|
|
struct rlimit rlim;
|
|
|
|
if (getrlimit(RLIMIT_NOFILE, &rlim) == 0)
|
|
return min((int)rlim.rlim_max / 2, 512);
|
|
|
|
return 512;
|
|
}
|
|
|
|
/*
|
|
* nftw() doesn't let us pass an argument to the processing function,
|
|
* so use a global variables.
|
|
*/
|
|
static FILE *eventsfp;
|
|
static char *mapfile;
|
|
|
|
static int process_one_file(const char *fpath, const struct stat *sb,
|
|
int typeflag, struct FTW *ftwbuf)
|
|
{
|
|
char *tblname, *bname = (char *) fpath + ftwbuf->base;
|
|
int is_dir = typeflag == FTW_D;
|
|
int is_file = typeflag == FTW_F;
|
|
int level = ftwbuf->level;
|
|
int err = 0;
|
|
|
|
pr_debug("%s %d %7jd %-20s %s\n",
|
|
is_file ? "f" : is_dir ? "d" : "x",
|
|
level, sb->st_size, bname, fpath);
|
|
|
|
/* base dir */
|
|
if (level == 0)
|
|
return 0;
|
|
|
|
/* model directory, reset topic */
|
|
if (level == 1 && is_dir) {
|
|
if (close_table)
|
|
print_events_table_suffix(eventsfp);
|
|
|
|
/*
|
|
* Drop file name suffix. Replace hyphens with underscores.
|
|
* Fail if file name contains any alphanum characters besides
|
|
* underscores.
|
|
*/
|
|
tblname = file_name_to_table_name(bname);
|
|
if (!tblname) {
|
|
pr_info("%s: Error determining table name for %s\n", prog,
|
|
bname);
|
|
return -1;
|
|
}
|
|
|
|
print_events_table_prefix(eventsfp, tblname);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Save the mapfile name for now. We will process mapfile
|
|
* after processing all JSON files (so we can write out the
|
|
* mapping table after all PMU events tables).
|
|
*
|
|
* TODO: Allow for multiple mapfiles? Punt for now.
|
|
*/
|
|
if (level == 1 && is_file) {
|
|
if (!strncmp(bname, "mapfile.csv", 11)) {
|
|
if (mapfile) {
|
|
pr_info("%s: Many mapfiles? Using %s, ignoring %s\n",
|
|
prog, mapfile, fpath);
|
|
} else {
|
|
mapfile = strdup(fpath);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
pr_info("%s: Ignoring file %s\n", prog, fpath);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If the file name does not have a .json extension,
|
|
* ignore it. It could be a readme.txt for instance.
|
|
*/
|
|
if (is_file) {
|
|
char *suffix = bname + strlen(bname) - 5;
|
|
|
|
if (strncmp(suffix, ".json", 5)) {
|
|
pr_info("%s: Ignoring file without .json suffix %s\n", prog,
|
|
fpath);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (level > 1 && add_topic(level, bname))
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Assume all other files are JSON files.
|
|
*
|
|
* If mapfile refers to 'power7_core.json', we create a table
|
|
* named 'power7_core'. Any inconsistencies between the mapfile
|
|
* and directory tree could result in build failure due to table
|
|
* names not being found.
|
|
*
|
|
* Atleast for now, be strict with processing JSON file names.
|
|
* i.e. if JSON file name cannot be mapped to C-style table name,
|
|
* fail.
|
|
*/
|
|
if (is_file) {
|
|
struct perf_entry_data data = {
|
|
.topic = get_topic(),
|
|
.outfp = eventsfp,
|
|
};
|
|
|
|
err = json_events(fpath, print_events_table_entry, &data);
|
|
|
|
free(data.topic);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
#ifndef PATH_MAX
|
|
#define PATH_MAX 4096
|
|
#endif
|
|
|
|
/*
|
|
* Starting in directory 'start_dirname', find the "mapfile.csv" and
|
|
* the set of JSON files for the architecture 'arch'.
|
|
*
|
|
* From each JSON file, create a C-style "PMU events table" from the
|
|
* JSON file (see struct pmu_event).
|
|
*
|
|
* From the mapfile, create a mapping between the CPU revisions and
|
|
* PMU event tables (see struct pmu_events_map).
|
|
*
|
|
* Write out the PMU events tables and the mapping table to pmu-event.c.
|
|
*
|
|
* If unable to process the JSON or arch files, create an empty mapping
|
|
* table so we can continue to build/use perf even if we cannot use the
|
|
* PMU event aliases.
|
|
*/
|
|
int main(int argc, char *argv[])
|
|
{
|
|
int rc;
|
|
int maxfds;
|
|
char ldirname[PATH_MAX];
|
|
|
|
const char *arch;
|
|
const char *output_file;
|
|
const char *start_dirname;
|
|
|
|
prog = basename(argv[0]);
|
|
if (argc < 4) {
|
|
pr_err("Usage: %s <arch> <starting_dir> <output_file>\n", prog);
|
|
return 1;
|
|
}
|
|
|
|
arch = argv[1];
|
|
start_dirname = argv[2];
|
|
output_file = argv[3];
|
|
|
|
if (argc > 4)
|
|
verbose = atoi(argv[4]);
|
|
|
|
eventsfp = fopen(output_file, "w");
|
|
if (!eventsfp) {
|
|
pr_err("%s Unable to create required file %s (%s)\n",
|
|
prog, output_file, strerror(errno));
|
|
return 2;
|
|
}
|
|
|
|
/* Include pmu-events.h first */
|
|
fprintf(eventsfp, "#include \"../../pmu-events/pmu-events.h\"\n");
|
|
|
|
sprintf(ldirname, "%s/%s", start_dirname, arch);
|
|
|
|
/*
|
|
* The mapfile allows multiple CPUids to point to the same JSON file,
|
|
* so, not sure if there is a need for symlinks within the pmu-events
|
|
* directory.
|
|
*
|
|
* For now, treat symlinks of JSON files as regular files and create
|
|
* separate tables for each symlink (presumably, each symlink refers
|
|
* to specific version of the CPU).
|
|
*/
|
|
|
|
maxfds = get_maxfds();
|
|
mapfile = NULL;
|
|
rc = nftw(ldirname, process_one_file, maxfds, 0);
|
|
if (rc && verbose) {
|
|
pr_info("%s: Error walking file tree %s\n", prog, ldirname);
|
|
goto empty_map;
|
|
} else if (rc) {
|
|
goto empty_map;
|
|
}
|
|
|
|
if (close_table)
|
|
print_events_table_suffix(eventsfp);
|
|
|
|
if (!mapfile) {
|
|
pr_info("%s: No CPU->JSON mapping?\n", prog);
|
|
goto empty_map;
|
|
}
|
|
|
|
if (process_mapfile(eventsfp, mapfile)) {
|
|
pr_info("%s: Error processing mapfile %s\n", prog, mapfile);
|
|
goto empty_map;
|
|
}
|
|
|
|
return 0;
|
|
|
|
empty_map:
|
|
fclose(eventsfp);
|
|
create_empty_mapping(output_file);
|
|
return 0;
|
|
}
|