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![Ian Rogers](/assets/img/avatar_default.png)
test__checkevent_complex_name will use an "event" format which if not
present, such as with a placeholder PMU, will cause test failures. Skip
the test in this case to avoid failures in restricted environments.
Add perf_pmu__has_format utility as a general PMU utility.
Fixes: 628eaa4e87
("perf pmus: Add placeholder core PMU")
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Thomas Richter <tmricht@linux.ibm.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230706183705.601412-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
1792 lines
39 KiB
C
1792 lines
39 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/list.h>
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#include <linux/compiler.h>
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#include <linux/string.h>
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#include <linux/zalloc.h>
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#include <linux/ctype.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include <dirent.h>
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#include <api/fs/fs.h>
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#include <locale.h>
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#include <fnmatch.h>
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#include <math.h>
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#include "debug.h"
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#include "evsel.h"
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#include "pmu.h"
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#include "pmus.h"
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#include "pmu-bison.h"
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#include "pmu-flex.h"
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#include "parse-events.h"
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#include "print-events.h"
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#include "header.h"
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#include "string2.h"
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#include "strbuf.h"
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#include "fncache.h"
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#include "util/evsel_config.h"
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struct perf_pmu perf_pmu__fake;
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/**
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* struct perf_pmu_format - Values from a format file read from
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* <sysfs>/devices/cpu/format/ held in struct perf_pmu.
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*
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* For example, the contents of <sysfs>/devices/cpu/format/event may be
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* "config:0-7" and will be represented here as name="event",
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* value=PERF_PMU_FORMAT_VALUE_CONFIG and bits 0 to 7 will be set.
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*/
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struct perf_pmu_format {
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/** @name: The modifier/file name. */
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char *name;
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/**
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* @value : Which config value the format relates to. Supported values
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* are from PERF_PMU_FORMAT_VALUE_CONFIG to
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* PERF_PMU_FORMAT_VALUE_CONFIG_END.
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*/
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int value;
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/** @bits: Which config bits are set by this format value. */
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DECLARE_BITMAP(bits, PERF_PMU_FORMAT_BITS);
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/** @list: Element on list within struct perf_pmu. */
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struct list_head list;
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};
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/*
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* Parse & process all the sysfs attributes located under
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* the directory specified in 'dir' parameter.
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*/
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int perf_pmu__format_parse(int dirfd, struct list_head *head)
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{
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struct dirent *evt_ent;
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DIR *format_dir;
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int ret = 0;
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format_dir = fdopendir(dirfd);
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if (!format_dir)
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return -EINVAL;
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while (!ret && (evt_ent = readdir(format_dir))) {
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char *name = evt_ent->d_name;
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int fd;
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void *scanner;
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FILE *file;
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if (!strcmp(name, ".") || !strcmp(name, ".."))
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continue;
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ret = -EINVAL;
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fd = openat(dirfd, name, O_RDONLY);
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if (fd < 0)
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break;
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file = fdopen(fd, "r");
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if (!file) {
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close(fd);
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break;
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}
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ret = perf_pmu_lex_init(&scanner);
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if (ret) {
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fclose(file);
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break;
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}
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perf_pmu_set_in(file, scanner);
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ret = perf_pmu_parse(head, name, scanner);
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perf_pmu_lex_destroy(scanner);
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fclose(file);
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}
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closedir(format_dir);
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return ret;
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}
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/*
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* Reading/parsing the default pmu format definition, which should be
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* located at:
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* /sys/bus/event_source/devices/<dev>/format as sysfs group attributes.
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*/
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static int pmu_format(int dirfd, const char *name, struct list_head *format)
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{
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int fd;
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fd = perf_pmu__pathname_fd(dirfd, name, "format", O_DIRECTORY);
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if (fd < 0)
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return 0;
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/* it'll close the fd */
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if (perf_pmu__format_parse(fd, format))
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return -1;
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return 0;
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}
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int perf_pmu__convert_scale(const char *scale, char **end, double *sval)
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{
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char *lc;
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int ret = 0;
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/*
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* save current locale
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*/
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lc = setlocale(LC_NUMERIC, NULL);
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/*
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* The lc string may be allocated in static storage,
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* so get a dynamic copy to make it survive setlocale
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* call below.
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*/
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lc = strdup(lc);
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if (!lc) {
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ret = -ENOMEM;
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goto out;
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}
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/*
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* force to C locale to ensure kernel
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* scale string is converted correctly.
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* kernel uses default C locale.
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*/
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setlocale(LC_NUMERIC, "C");
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*sval = strtod(scale, end);
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out:
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/* restore locale */
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setlocale(LC_NUMERIC, lc);
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free(lc);
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return ret;
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}
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static int perf_pmu__parse_scale(struct perf_pmu_alias *alias, int dirfd, char *name)
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{
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struct stat st;
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ssize_t sret;
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char scale[128];
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int fd, ret = -1;
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char path[PATH_MAX];
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scnprintf(path, PATH_MAX, "%s.scale", name);
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fd = openat(dirfd, path, O_RDONLY);
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if (fd == -1)
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return -1;
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if (fstat(fd, &st) < 0)
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goto error;
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sret = read(fd, scale, sizeof(scale)-1);
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if (sret < 0)
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goto error;
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if (scale[sret - 1] == '\n')
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scale[sret - 1] = '\0';
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else
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scale[sret] = '\0';
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ret = perf_pmu__convert_scale(scale, NULL, &alias->scale);
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error:
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close(fd);
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return ret;
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}
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static int perf_pmu__parse_unit(struct perf_pmu_alias *alias, int dirfd, char *name)
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{
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char path[PATH_MAX];
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ssize_t sret;
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int fd;
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scnprintf(path, PATH_MAX, "%s.unit", name);
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fd = openat(dirfd, path, O_RDONLY);
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if (fd == -1)
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return -1;
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sret = read(fd, alias->unit, UNIT_MAX_LEN);
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if (sret < 0)
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goto error;
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close(fd);
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if (alias->unit[sret - 1] == '\n')
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alias->unit[sret - 1] = '\0';
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else
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alias->unit[sret] = '\0';
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return 0;
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error:
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close(fd);
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alias->unit[0] = '\0';
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return -1;
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}
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static int
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perf_pmu__parse_per_pkg(struct perf_pmu_alias *alias, int dirfd, char *name)
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{
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char path[PATH_MAX];
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int fd;
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scnprintf(path, PATH_MAX, "%s.per-pkg", name);
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fd = openat(dirfd, path, O_RDONLY);
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if (fd == -1)
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return -1;
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close(fd);
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alias->per_pkg = true;
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return 0;
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}
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static int perf_pmu__parse_snapshot(struct perf_pmu_alias *alias,
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int dirfd, char *name)
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{
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char path[PATH_MAX];
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int fd;
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scnprintf(path, PATH_MAX, "%s.snapshot", name);
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fd = openat(dirfd, path, O_RDONLY);
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if (fd == -1)
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return -1;
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alias->snapshot = true;
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close(fd);
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return 0;
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}
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static void perf_pmu_assign_str(char *name, const char *field, char **old_str,
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char **new_str)
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{
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if (!*old_str)
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goto set_new;
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if (*new_str) { /* Have new string, check with old */
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if (strcasecmp(*old_str, *new_str))
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pr_debug("alias %s differs in field '%s'\n",
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name, field);
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zfree(old_str);
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} else /* Nothing new --> keep old string */
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return;
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set_new:
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*old_str = *new_str;
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*new_str = NULL;
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}
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static void perf_pmu_update_alias(struct perf_pmu_alias *old,
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struct perf_pmu_alias *newalias)
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{
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perf_pmu_assign_str(old->name, "desc", &old->desc, &newalias->desc);
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perf_pmu_assign_str(old->name, "long_desc", &old->long_desc,
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&newalias->long_desc);
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perf_pmu_assign_str(old->name, "topic", &old->topic, &newalias->topic);
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perf_pmu_assign_str(old->name, "value", &old->str, &newalias->str);
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old->scale = newalias->scale;
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old->per_pkg = newalias->per_pkg;
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old->snapshot = newalias->snapshot;
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memcpy(old->unit, newalias->unit, sizeof(old->unit));
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}
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/* Delete an alias entry. */
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void perf_pmu_free_alias(struct perf_pmu_alias *newalias)
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{
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zfree(&newalias->name);
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zfree(&newalias->desc);
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zfree(&newalias->long_desc);
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zfree(&newalias->topic);
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zfree(&newalias->str);
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zfree(&newalias->pmu_name);
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parse_events_terms__purge(&newalias->terms);
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free(newalias);
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}
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static void perf_pmu__del_aliases(struct perf_pmu *pmu)
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{
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struct perf_pmu_alias *alias, *tmp;
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list_for_each_entry_safe(alias, tmp, &pmu->aliases, list) {
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list_del(&alias->list);
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perf_pmu_free_alias(alias);
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}
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}
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/* Merge an alias, search in alias list. If this name is already
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* present merge both of them to combine all information.
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*/
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static bool perf_pmu_merge_alias(struct perf_pmu_alias *newalias,
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struct list_head *alist)
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{
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struct perf_pmu_alias *a;
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list_for_each_entry(a, alist, list) {
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if (!strcasecmp(newalias->name, a->name)) {
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if (newalias->pmu_name && a->pmu_name &&
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!strcasecmp(newalias->pmu_name, a->pmu_name)) {
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continue;
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}
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perf_pmu_update_alias(a, newalias);
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perf_pmu_free_alias(newalias);
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return true;
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}
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}
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return false;
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}
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static int __perf_pmu__new_alias(struct list_head *list, int dirfd, char *name,
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char *desc, char *val, const struct pmu_event *pe)
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{
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struct parse_events_term *term;
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struct perf_pmu_alias *alias;
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int ret;
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char newval[256];
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const char *long_desc = NULL, *topic = NULL, *unit = NULL, *pmu_name = NULL;
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bool deprecated = false, perpkg = false;
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if (pe) {
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long_desc = pe->long_desc;
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topic = pe->topic;
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unit = pe->unit;
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perpkg = pe->perpkg;
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deprecated = pe->deprecated;
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pmu_name = pe->pmu;
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}
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alias = malloc(sizeof(*alias));
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if (!alias)
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return -ENOMEM;
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INIT_LIST_HEAD(&alias->terms);
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alias->scale = 1.0;
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alias->unit[0] = '\0';
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alias->per_pkg = perpkg;
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alias->snapshot = false;
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alias->deprecated = deprecated;
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ret = parse_events_terms(&alias->terms, val);
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if (ret) {
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pr_err("Cannot parse alias %s: %d\n", val, ret);
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free(alias);
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return ret;
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}
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/* Scan event and remove leading zeroes, spaces, newlines, some
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* platforms have terms specified as
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* event=0x0091 (read from files ../<PMU>/events/<FILE>
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* and terms specified as event=0x91 (read from JSON files).
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*
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* Rebuild string to make alias->str member comparable.
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*/
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memset(newval, 0, sizeof(newval));
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ret = 0;
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list_for_each_entry(term, &alias->terms, list) {
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if (ret)
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ret += scnprintf(newval + ret, sizeof(newval) - ret,
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",");
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if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM)
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ret += scnprintf(newval + ret, sizeof(newval) - ret,
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"%s=%#x", term->config, term->val.num);
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else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR)
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ret += scnprintf(newval + ret, sizeof(newval) - ret,
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"%s=%s", term->config, term->val.str);
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}
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alias->name = strdup(name);
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if (dirfd >= 0) {
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/*
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* load unit name and scale if available
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*/
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perf_pmu__parse_unit(alias, dirfd, name);
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perf_pmu__parse_scale(alias, dirfd, name);
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perf_pmu__parse_per_pkg(alias, dirfd, name);
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perf_pmu__parse_snapshot(alias, dirfd, name);
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}
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alias->desc = desc ? strdup(desc) : NULL;
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alias->long_desc = long_desc ? strdup(long_desc) :
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desc ? strdup(desc) : NULL;
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alias->topic = topic ? strdup(topic) : NULL;
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if (unit) {
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if (perf_pmu__convert_scale(unit, (char **)&unit, &alias->scale) < 0)
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return -1;
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snprintf(alias->unit, sizeof(alias->unit), "%s", unit);
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}
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alias->str = strdup(newval);
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alias->pmu_name = pmu_name ? strdup(pmu_name) : NULL;
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if (!perf_pmu_merge_alias(alias, list))
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list_add_tail(&alias->list, list);
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return 0;
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}
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|
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static int perf_pmu__new_alias(struct list_head *list, int dirfd, char *name, FILE *file)
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{
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char buf[256];
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int ret;
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ret = fread(buf, 1, sizeof(buf), file);
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if (ret == 0)
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return -EINVAL;
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buf[ret] = 0;
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/* Remove trailing newline from sysfs file */
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strim(buf);
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return __perf_pmu__new_alias(list, dirfd, name, NULL, buf, NULL);
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}
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|
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static inline bool pmu_alias_info_file(char *name)
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{
|
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size_t len;
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|
|
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len = strlen(name);
|
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if (len > 5 && !strcmp(name + len - 5, ".unit"))
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return true;
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if (len > 6 && !strcmp(name + len - 6, ".scale"))
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return true;
|
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if (len > 8 && !strcmp(name + len - 8, ".per-pkg"))
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return true;
|
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if (len > 9 && !strcmp(name + len - 9, ".snapshot"))
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return true;
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|
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return false;
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}
|
|
|
|
/*
|
|
* Process all the sysfs attributes located under the directory
|
|
* specified in 'dir' parameter.
|
|
*/
|
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static int pmu_aliases_parse(int dirfd, struct list_head *head)
|
|
{
|
|
struct dirent *evt_ent;
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DIR *event_dir;
|
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int fd;
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|
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event_dir = fdopendir(dirfd);
|
|
if (!event_dir)
|
|
return -EINVAL;
|
|
|
|
while ((evt_ent = readdir(event_dir))) {
|
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char *name = evt_ent->d_name;
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|
FILE *file;
|
|
|
|
if (!strcmp(name, ".") || !strcmp(name, ".."))
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|
continue;
|
|
|
|
/*
|
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* skip info files parsed in perf_pmu__new_alias()
|
|
*/
|
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if (pmu_alias_info_file(name))
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|
continue;
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|
|
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fd = openat(dirfd, name, O_RDONLY);
|
|
if (fd == -1) {
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pr_debug("Cannot open %s\n", name);
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|
continue;
|
|
}
|
|
file = fdopen(fd, "r");
|
|
if (!file) {
|
|
close(fd);
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|
continue;
|
|
}
|
|
|
|
if (perf_pmu__new_alias(head, dirfd, name, file) < 0)
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|
pr_debug("Cannot set up %s\n", name);
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|
fclose(file);
|
|
}
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|
|
closedir(event_dir);
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|
return 0;
|
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}
|
|
|
|
/*
|
|
* Reading the pmu event aliases definition, which should be located at:
|
|
* /sys/bus/event_source/devices/<dev>/events as sysfs group attributes.
|
|
*/
|
|
static int pmu_aliases(int dirfd, const char *name, struct list_head *head)
|
|
{
|
|
int fd;
|
|
|
|
fd = perf_pmu__pathname_fd(dirfd, name, "events", O_DIRECTORY);
|
|
if (fd < 0)
|
|
return 0;
|
|
|
|
/* it'll close the fd */
|
|
if (pmu_aliases_parse(fd, head))
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pmu_alias_terms(struct perf_pmu_alias *alias,
|
|
struct list_head *terms)
|
|
{
|
|
struct parse_events_term *term, *cloned;
|
|
LIST_HEAD(list);
|
|
int ret;
|
|
|
|
list_for_each_entry(term, &alias->terms, list) {
|
|
ret = parse_events_term__clone(&cloned, term);
|
|
if (ret) {
|
|
parse_events_terms__purge(&list);
|
|
return ret;
|
|
}
|
|
/*
|
|
* Weak terms don't override command line options,
|
|
* which we don't want for implicit terms in aliases.
|
|
*/
|
|
cloned->weak = true;
|
|
list_add_tail(&cloned->list, &list);
|
|
}
|
|
list_splice(&list, terms);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Uncore PMUs have a "cpumask" file under sysfs. CPU PMUs (e.g. on arm/arm64)
|
|
* may have a "cpus" file.
|
|
*/
|
|
static struct perf_cpu_map *pmu_cpumask(int dirfd, const char *name, bool is_core)
|
|
{
|
|
struct perf_cpu_map *cpus;
|
|
const char *templates[] = {
|
|
"cpumask",
|
|
"cpus",
|
|
NULL
|
|
};
|
|
const char **template;
|
|
char pmu_name[PATH_MAX];
|
|
struct perf_pmu pmu = {.name = pmu_name};
|
|
FILE *file;
|
|
|
|
strlcpy(pmu_name, name, sizeof(pmu_name));
|
|
for (template = templates; *template; template++) {
|
|
file = perf_pmu__open_file_at(&pmu, dirfd, *template);
|
|
if (!file)
|
|
continue;
|
|
cpus = perf_cpu_map__read(file);
|
|
fclose(file);
|
|
if (cpus)
|
|
return cpus;
|
|
}
|
|
|
|
/* Nothing found, for core PMUs assume this means all CPUs. */
|
|
return is_core ? perf_cpu_map__get(cpu_map__online()) : NULL;
|
|
}
|
|
|
|
static bool pmu_is_uncore(int dirfd, const char *name)
|
|
{
|
|
int fd;
|
|
|
|
fd = perf_pmu__pathname_fd(dirfd, name, "cpumask", O_PATH);
|
|
if (fd < 0)
|
|
return false;
|
|
|
|
close(fd);
|
|
return true;
|
|
}
|
|
|
|
static char *pmu_id(const char *name)
|
|
{
|
|
char path[PATH_MAX], *str;
|
|
size_t len;
|
|
|
|
perf_pmu__pathname_scnprintf(path, sizeof(path), name, "identifier");
|
|
|
|
if (filename__read_str(path, &str, &len) < 0)
|
|
return NULL;
|
|
|
|
str[len - 1] = 0; /* remove line feed */
|
|
|
|
return str;
|
|
}
|
|
|
|
/**
|
|
* is_sysfs_pmu_core() - PMU CORE devices have different name other than cpu in
|
|
* sysfs on some platforms like ARM or Intel hybrid. Looking for
|
|
* possible the cpus file in sysfs files to identify whether this is a
|
|
* core device.
|
|
* @name: The PMU name such as "cpu_atom".
|
|
*/
|
|
static int is_sysfs_pmu_core(const char *name)
|
|
{
|
|
char path[PATH_MAX];
|
|
|
|
if (!perf_pmu__pathname_scnprintf(path, sizeof(path), name, "cpus"))
|
|
return 0;
|
|
return file_available(path);
|
|
}
|
|
|
|
char *perf_pmu__getcpuid(struct perf_pmu *pmu)
|
|
{
|
|
char *cpuid;
|
|
static bool printed;
|
|
|
|
cpuid = getenv("PERF_CPUID");
|
|
if (cpuid)
|
|
cpuid = strdup(cpuid);
|
|
if (!cpuid)
|
|
cpuid = get_cpuid_str(pmu);
|
|
if (!cpuid)
|
|
return NULL;
|
|
|
|
if (!printed) {
|
|
pr_debug("Using CPUID %s\n", cpuid);
|
|
printed = true;
|
|
}
|
|
return cpuid;
|
|
}
|
|
|
|
__weak const struct pmu_events_table *pmu_events_table__find(void)
|
|
{
|
|
return perf_pmu__find_events_table(NULL);
|
|
}
|
|
|
|
__weak const struct pmu_metrics_table *pmu_metrics_table__find(void)
|
|
{
|
|
return perf_pmu__find_metrics_table(NULL);
|
|
}
|
|
|
|
/**
|
|
* perf_pmu__match_ignoring_suffix - Does the pmu_name match tok ignoring any
|
|
* trailing suffix? The Suffix must be in form
|
|
* tok_{digits}, or tok{digits}.
|
|
* @pmu_name: The pmu_name with possible suffix.
|
|
* @tok: The possible match to pmu_name without suffix.
|
|
*/
|
|
static bool perf_pmu__match_ignoring_suffix(const char *pmu_name, const char *tok)
|
|
{
|
|
const char *p;
|
|
|
|
if (strncmp(pmu_name, tok, strlen(tok)))
|
|
return false;
|
|
|
|
p = pmu_name + strlen(tok);
|
|
if (*p == 0)
|
|
return true;
|
|
|
|
if (*p == '_')
|
|
++p;
|
|
|
|
/* Ensure we end in a number */
|
|
while (1) {
|
|
if (!isdigit(*p))
|
|
return false;
|
|
if (*(++p) == 0)
|
|
break;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* pmu_uncore_alias_match - does name match the PMU name?
|
|
* @pmu_name: the json struct pmu_event name. This may lack a suffix (which
|
|
* matches) or be of the form "socket,pmuname" which will match
|
|
* "socketX_pmunameY".
|
|
* @name: a real full PMU name as from sysfs.
|
|
*/
|
|
static bool pmu_uncore_alias_match(const char *pmu_name, const char *name)
|
|
{
|
|
char *tmp = NULL, *tok, *str;
|
|
bool res;
|
|
|
|
if (strchr(pmu_name, ',') == NULL)
|
|
return perf_pmu__match_ignoring_suffix(name, pmu_name);
|
|
|
|
str = strdup(pmu_name);
|
|
if (!str)
|
|
return false;
|
|
|
|
/*
|
|
* uncore alias may be from different PMU with common prefix
|
|
*/
|
|
tok = strtok_r(str, ",", &tmp);
|
|
if (strncmp(pmu_name, tok, strlen(tok))) {
|
|
res = false;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Match more complex aliases where the alias name is a comma-delimited
|
|
* list of tokens, orderly contained in the matching PMU name.
|
|
*
|
|
* Example: For alias "socket,pmuname" and PMU "socketX_pmunameY", we
|
|
* match "socket" in "socketX_pmunameY" and then "pmuname" in
|
|
* "pmunameY".
|
|
*/
|
|
while (1) {
|
|
char *next_tok = strtok_r(NULL, ",", &tmp);
|
|
|
|
name = strstr(name, tok);
|
|
if (!name ||
|
|
(!next_tok && !perf_pmu__match_ignoring_suffix(name, tok))) {
|
|
res = false;
|
|
goto out;
|
|
}
|
|
if (!next_tok)
|
|
break;
|
|
tok = next_tok;
|
|
name += strlen(tok);
|
|
}
|
|
|
|
res = true;
|
|
out:
|
|
free(str);
|
|
return res;
|
|
}
|
|
|
|
struct pmu_add_cpu_aliases_map_data {
|
|
/* List being added to. */
|
|
struct list_head *head;
|
|
/* If a pmu_event lacks a given PMU the default used. */
|
|
char *default_pmu_name;
|
|
/* The PMU that we're searching for events for. */
|
|
struct perf_pmu *pmu;
|
|
};
|
|
|
|
static int pmu_add_cpu_aliases_map_callback(const struct pmu_event *pe,
|
|
const struct pmu_events_table *table __maybe_unused,
|
|
void *vdata)
|
|
{
|
|
struct pmu_add_cpu_aliases_map_data *data = vdata;
|
|
const char *pname = pe->pmu ?: data->default_pmu_name;
|
|
|
|
if (!strcmp(pname, data->pmu->name) ||
|
|
(data->pmu->is_uncore && pmu_uncore_alias_match(pname, data->pmu->name))) {
|
|
/* need type casts to override 'const' */
|
|
__perf_pmu__new_alias(data->head, -1, (char *)pe->name, (char *)pe->desc,
|
|
(char *)pe->event, pe);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* From the pmu_events_table, find the events that correspond to the given
|
|
* PMU and add them to the list 'head'.
|
|
*/
|
|
void pmu_add_cpu_aliases_table(struct list_head *head, struct perf_pmu *pmu,
|
|
const struct pmu_events_table *table)
|
|
{
|
|
struct pmu_add_cpu_aliases_map_data data = {
|
|
.head = head,
|
|
.default_pmu_name = perf_pmus__default_pmu_name(),
|
|
.pmu = pmu,
|
|
};
|
|
|
|
pmu_events_table_for_each_event(table, pmu_add_cpu_aliases_map_callback, &data);
|
|
free(data.default_pmu_name);
|
|
}
|
|
|
|
static void pmu_add_cpu_aliases(struct list_head *head, struct perf_pmu *pmu)
|
|
{
|
|
const struct pmu_events_table *table;
|
|
|
|
table = perf_pmu__find_events_table(pmu);
|
|
if (!table)
|
|
return;
|
|
|
|
pmu_add_cpu_aliases_table(head, pmu, table);
|
|
}
|
|
|
|
struct pmu_sys_event_iter_data {
|
|
struct list_head *head;
|
|
struct perf_pmu *pmu;
|
|
};
|
|
|
|
static int pmu_add_sys_aliases_iter_fn(const struct pmu_event *pe,
|
|
const struct pmu_events_table *table __maybe_unused,
|
|
void *data)
|
|
{
|
|
struct pmu_sys_event_iter_data *idata = data;
|
|
struct perf_pmu *pmu = idata->pmu;
|
|
|
|
if (!pe->compat || !pe->pmu)
|
|
return 0;
|
|
|
|
if (!strcmp(pmu->id, pe->compat) &&
|
|
pmu_uncore_alias_match(pe->pmu, pmu->name)) {
|
|
__perf_pmu__new_alias(idata->head, -1,
|
|
(char *)pe->name,
|
|
(char *)pe->desc,
|
|
(char *)pe->event,
|
|
pe);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void pmu_add_sys_aliases(struct list_head *head, struct perf_pmu *pmu)
|
|
{
|
|
struct pmu_sys_event_iter_data idata = {
|
|
.head = head,
|
|
.pmu = pmu,
|
|
};
|
|
|
|
if (!pmu->id)
|
|
return;
|
|
|
|
pmu_for_each_sys_event(pmu_add_sys_aliases_iter_fn, &idata);
|
|
}
|
|
|
|
struct perf_event_attr * __weak
|
|
perf_pmu__get_default_config(struct perf_pmu *pmu __maybe_unused)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
char * __weak
|
|
pmu_find_real_name(const char *name)
|
|
{
|
|
return (char *)name;
|
|
}
|
|
|
|
char * __weak
|
|
pmu_find_alias_name(const char *name __maybe_unused)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static int pmu_max_precise(int dirfd, struct perf_pmu *pmu)
|
|
{
|
|
int max_precise = -1;
|
|
|
|
perf_pmu__scan_file_at(pmu, dirfd, "caps/max_precise", "%d", &max_precise);
|
|
return max_precise;
|
|
}
|
|
|
|
struct perf_pmu *perf_pmu__lookup(struct list_head *pmus, int dirfd, const char *lookup_name)
|
|
{
|
|
struct perf_pmu *pmu;
|
|
LIST_HEAD(format);
|
|
LIST_HEAD(aliases);
|
|
__u32 type;
|
|
char *name = pmu_find_real_name(lookup_name);
|
|
char *alias_name;
|
|
|
|
/*
|
|
* The pmu data we store & need consists of the pmu
|
|
* type value and format definitions. Load both right
|
|
* now.
|
|
*/
|
|
if (pmu_format(dirfd, name, &format))
|
|
return NULL;
|
|
|
|
/*
|
|
* Check the aliases first to avoid unnecessary work.
|
|
*/
|
|
if (pmu_aliases(dirfd, name, &aliases))
|
|
return NULL;
|
|
|
|
pmu = zalloc(sizeof(*pmu));
|
|
if (!pmu)
|
|
return NULL;
|
|
|
|
pmu->is_core = is_pmu_core(name);
|
|
pmu->cpus = pmu_cpumask(dirfd, name, pmu->is_core);
|
|
pmu->name = strdup(name);
|
|
if (!pmu->name)
|
|
goto err;
|
|
|
|
/* Read type, and ensure that type value is successfully assigned (return 1) */
|
|
if (perf_pmu__scan_file_at(pmu, dirfd, "type", "%u", &type) != 1)
|
|
goto err;
|
|
|
|
alias_name = pmu_find_alias_name(name);
|
|
if (alias_name) {
|
|
pmu->alias_name = strdup(alias_name);
|
|
if (!pmu->alias_name)
|
|
goto err;
|
|
}
|
|
|
|
pmu->type = type;
|
|
pmu->is_uncore = pmu_is_uncore(dirfd, name);
|
|
if (pmu->is_uncore)
|
|
pmu->id = pmu_id(name);
|
|
pmu->max_precise = pmu_max_precise(dirfd, pmu);
|
|
pmu_add_cpu_aliases(&aliases, pmu);
|
|
pmu_add_sys_aliases(&aliases, pmu);
|
|
|
|
INIT_LIST_HEAD(&pmu->format);
|
|
INIT_LIST_HEAD(&pmu->aliases);
|
|
INIT_LIST_HEAD(&pmu->caps);
|
|
list_splice(&format, &pmu->format);
|
|
list_splice(&aliases, &pmu->aliases);
|
|
list_add_tail(&pmu->list, pmus);
|
|
|
|
pmu->default_config = perf_pmu__get_default_config(pmu);
|
|
|
|
return pmu;
|
|
err:
|
|
zfree(&pmu->name);
|
|
free(pmu);
|
|
return NULL;
|
|
}
|
|
|
|
/* Creates the PMU when sysfs scanning fails. */
|
|
struct perf_pmu *perf_pmu__create_placeholder_core_pmu(struct list_head *core_pmus)
|
|
{
|
|
struct perf_pmu *pmu = zalloc(sizeof(*pmu));
|
|
|
|
if (!pmu)
|
|
return NULL;
|
|
|
|
pmu->name = strdup("cpu");
|
|
if (!pmu->name) {
|
|
free(pmu);
|
|
return NULL;
|
|
}
|
|
|
|
pmu->is_core = true;
|
|
pmu->type = PERF_TYPE_RAW;
|
|
pmu->cpus = cpu_map__online();
|
|
|
|
INIT_LIST_HEAD(&pmu->format);
|
|
INIT_LIST_HEAD(&pmu->aliases);
|
|
INIT_LIST_HEAD(&pmu->caps);
|
|
list_add_tail(&pmu->list, core_pmus);
|
|
return pmu;
|
|
}
|
|
|
|
void perf_pmu__warn_invalid_formats(struct perf_pmu *pmu)
|
|
{
|
|
struct perf_pmu_format *format;
|
|
|
|
if (pmu->formats_checked)
|
|
return;
|
|
|
|
pmu->formats_checked = true;
|
|
|
|
/* fake pmu doesn't have format list */
|
|
if (pmu == &perf_pmu__fake)
|
|
return;
|
|
|
|
list_for_each_entry(format, &pmu->format, list)
|
|
if (format->value >= PERF_PMU_FORMAT_VALUE_CONFIG_END) {
|
|
pr_warning("WARNING: '%s' format '%s' requires 'perf_event_attr::config%d'"
|
|
"which is not supported by this version of perf!\n",
|
|
pmu->name, format->name, format->value);
|
|
return;
|
|
}
|
|
}
|
|
|
|
bool evsel__is_aux_event(const struct evsel *evsel)
|
|
{
|
|
struct perf_pmu *pmu = evsel__find_pmu(evsel);
|
|
|
|
return pmu && pmu->auxtrace;
|
|
}
|
|
|
|
/*
|
|
* Set @config_name to @val as long as the user hasn't already set or cleared it
|
|
* by passing a config term on the command line.
|
|
*
|
|
* @val is the value to put into the bits specified by @config_name rather than
|
|
* the bit pattern. It is shifted into position by this function, so to set
|
|
* something to true, pass 1 for val rather than a pre shifted value.
|
|
*/
|
|
#define field_prep(_mask, _val) (((_val) << (ffsll(_mask) - 1)) & (_mask))
|
|
void evsel__set_config_if_unset(struct perf_pmu *pmu, struct evsel *evsel,
|
|
const char *config_name, u64 val)
|
|
{
|
|
u64 user_bits = 0, bits;
|
|
struct evsel_config_term *term = evsel__get_config_term(evsel, CFG_CHG);
|
|
|
|
if (term)
|
|
user_bits = term->val.cfg_chg;
|
|
|
|
bits = perf_pmu__format_bits(&pmu->format, config_name);
|
|
|
|
/* Do nothing if the user changed the value */
|
|
if (bits & user_bits)
|
|
return;
|
|
|
|
/* Otherwise replace it */
|
|
evsel->core.attr.config &= ~bits;
|
|
evsel->core.attr.config |= field_prep(bits, val);
|
|
}
|
|
|
|
static struct perf_pmu_format *
|
|
pmu_find_format(struct list_head *formats, const char *name)
|
|
{
|
|
struct perf_pmu_format *format;
|
|
|
|
list_for_each_entry(format, formats, list)
|
|
if (!strcmp(format->name, name))
|
|
return format;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
__u64 perf_pmu__format_bits(struct list_head *formats, const char *name)
|
|
{
|
|
struct perf_pmu_format *format = pmu_find_format(formats, name);
|
|
__u64 bits = 0;
|
|
int fbit;
|
|
|
|
if (!format)
|
|
return 0;
|
|
|
|
for_each_set_bit(fbit, format->bits, PERF_PMU_FORMAT_BITS)
|
|
bits |= 1ULL << fbit;
|
|
|
|
return bits;
|
|
}
|
|
|
|
int perf_pmu__format_type(struct list_head *formats, const char *name)
|
|
{
|
|
struct perf_pmu_format *format = pmu_find_format(formats, name);
|
|
|
|
if (!format)
|
|
return -1;
|
|
|
|
return format->value;
|
|
}
|
|
|
|
/*
|
|
* Sets value based on the format definition (format parameter)
|
|
* and unformatted value (value parameter).
|
|
*/
|
|
static void pmu_format_value(unsigned long *format, __u64 value, __u64 *v,
|
|
bool zero)
|
|
{
|
|
unsigned long fbit, vbit;
|
|
|
|
for (fbit = 0, vbit = 0; fbit < PERF_PMU_FORMAT_BITS; fbit++) {
|
|
|
|
if (!test_bit(fbit, format))
|
|
continue;
|
|
|
|
if (value & (1llu << vbit++))
|
|
*v |= (1llu << fbit);
|
|
else if (zero)
|
|
*v &= ~(1llu << fbit);
|
|
}
|
|
}
|
|
|
|
static __u64 pmu_format_max_value(const unsigned long *format)
|
|
{
|
|
int w;
|
|
|
|
w = bitmap_weight(format, PERF_PMU_FORMAT_BITS);
|
|
if (!w)
|
|
return 0;
|
|
if (w < 64)
|
|
return (1ULL << w) - 1;
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Term is a string term, and might be a param-term. Try to look up it's value
|
|
* in the remaining terms.
|
|
* - We have a term like "base-or-format-term=param-term",
|
|
* - We need to find the value supplied for "param-term" (with param-term named
|
|
* in a config string) later on in the term list.
|
|
*/
|
|
static int pmu_resolve_param_term(struct parse_events_term *term,
|
|
struct list_head *head_terms,
|
|
__u64 *value)
|
|
{
|
|
struct parse_events_term *t;
|
|
|
|
list_for_each_entry(t, head_terms, list) {
|
|
if (t->type_val == PARSE_EVENTS__TERM_TYPE_NUM &&
|
|
t->config && !strcmp(t->config, term->config)) {
|
|
t->used = true;
|
|
*value = t->val.num;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (verbose > 0)
|
|
printf("Required parameter '%s' not specified\n", term->config);
|
|
|
|
return -1;
|
|
}
|
|
|
|
static char *pmu_formats_string(struct list_head *formats)
|
|
{
|
|
struct perf_pmu_format *format;
|
|
char *str = NULL;
|
|
struct strbuf buf = STRBUF_INIT;
|
|
unsigned int i = 0;
|
|
|
|
if (!formats)
|
|
return NULL;
|
|
|
|
/* sysfs exported terms */
|
|
list_for_each_entry(format, formats, list)
|
|
if (strbuf_addf(&buf, i++ ? ",%s" : "%s", format->name) < 0)
|
|
goto error;
|
|
|
|
str = strbuf_detach(&buf, NULL);
|
|
error:
|
|
strbuf_release(&buf);
|
|
|
|
return str;
|
|
}
|
|
|
|
/*
|
|
* Setup one of config[12] attr members based on the
|
|
* user input data - term parameter.
|
|
*/
|
|
static int pmu_config_term(const char *pmu_name,
|
|
struct list_head *formats,
|
|
struct perf_event_attr *attr,
|
|
struct parse_events_term *term,
|
|
struct list_head *head_terms,
|
|
bool zero, struct parse_events_error *err)
|
|
{
|
|
struct perf_pmu_format *format;
|
|
__u64 *vp;
|
|
__u64 val, max_val;
|
|
|
|
/*
|
|
* If this is a parameter we've already used for parameterized-eval,
|
|
* skip it in normal eval.
|
|
*/
|
|
if (term->used)
|
|
return 0;
|
|
|
|
/*
|
|
* Hardcoded terms should be already in, so nothing
|
|
* to be done for them.
|
|
*/
|
|
if (parse_events__is_hardcoded_term(term))
|
|
return 0;
|
|
|
|
format = pmu_find_format(formats, term->config);
|
|
if (!format) {
|
|
char *pmu_term = pmu_formats_string(formats);
|
|
char *unknown_term;
|
|
char *help_msg;
|
|
|
|
if (asprintf(&unknown_term,
|
|
"unknown term '%s' for pmu '%s'",
|
|
term->config, pmu_name) < 0)
|
|
unknown_term = NULL;
|
|
help_msg = parse_events_formats_error_string(pmu_term);
|
|
if (err) {
|
|
parse_events_error__handle(err, term->err_term,
|
|
unknown_term,
|
|
help_msg);
|
|
} else {
|
|
pr_debug("%s (%s)\n", unknown_term, help_msg);
|
|
free(unknown_term);
|
|
}
|
|
free(pmu_term);
|
|
return -EINVAL;
|
|
}
|
|
|
|
switch (format->value) {
|
|
case PERF_PMU_FORMAT_VALUE_CONFIG:
|
|
vp = &attr->config;
|
|
break;
|
|
case PERF_PMU_FORMAT_VALUE_CONFIG1:
|
|
vp = &attr->config1;
|
|
break;
|
|
case PERF_PMU_FORMAT_VALUE_CONFIG2:
|
|
vp = &attr->config2;
|
|
break;
|
|
case PERF_PMU_FORMAT_VALUE_CONFIG3:
|
|
vp = &attr->config3;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Either directly use a numeric term, or try to translate string terms
|
|
* using event parameters.
|
|
*/
|
|
if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
|
|
if (term->no_value &&
|
|
bitmap_weight(format->bits, PERF_PMU_FORMAT_BITS) > 1) {
|
|
if (err) {
|
|
parse_events_error__handle(err, term->err_val,
|
|
strdup("no value assigned for term"),
|
|
NULL);
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
val = term->val.num;
|
|
} else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
|
|
if (strcmp(term->val.str, "?")) {
|
|
if (verbose > 0) {
|
|
pr_info("Invalid sysfs entry %s=%s\n",
|
|
term->config, term->val.str);
|
|
}
|
|
if (err) {
|
|
parse_events_error__handle(err, term->err_val,
|
|
strdup("expected numeric value"),
|
|
NULL);
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (pmu_resolve_param_term(term, head_terms, &val))
|
|
return -EINVAL;
|
|
} else
|
|
return -EINVAL;
|
|
|
|
max_val = pmu_format_max_value(format->bits);
|
|
if (val > max_val) {
|
|
if (err) {
|
|
char *err_str;
|
|
|
|
parse_events_error__handle(err, term->err_val,
|
|
asprintf(&err_str,
|
|
"value too big for format, maximum is %llu",
|
|
(unsigned long long)max_val) < 0
|
|
? strdup("value too big for format")
|
|
: err_str,
|
|
NULL);
|
|
return -EINVAL;
|
|
}
|
|
/*
|
|
* Assume we don't care if !err, in which case the value will be
|
|
* silently truncated.
|
|
*/
|
|
}
|
|
|
|
pmu_format_value(format->bits, val, vp, zero);
|
|
return 0;
|
|
}
|
|
|
|
int perf_pmu__config_terms(const char *pmu_name, struct list_head *formats,
|
|
struct perf_event_attr *attr,
|
|
struct list_head *head_terms,
|
|
bool zero, struct parse_events_error *err)
|
|
{
|
|
struct parse_events_term *term;
|
|
|
|
list_for_each_entry(term, head_terms, list) {
|
|
if (pmu_config_term(pmu_name, formats, attr, term, head_terms,
|
|
zero, err))
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Configures event's 'attr' parameter based on the:
|
|
* 1) users input - specified in terms parameter
|
|
* 2) pmu format definitions - specified by pmu parameter
|
|
*/
|
|
int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
|
|
struct list_head *head_terms,
|
|
struct parse_events_error *err)
|
|
{
|
|
bool zero = !!pmu->default_config;
|
|
|
|
return perf_pmu__config_terms(pmu->name, &pmu->format, attr,
|
|
head_terms, zero, err);
|
|
}
|
|
|
|
static struct perf_pmu_alias *pmu_find_alias(struct perf_pmu *pmu,
|
|
struct parse_events_term *term)
|
|
{
|
|
struct perf_pmu_alias *alias;
|
|
char *name;
|
|
|
|
if (parse_events__is_hardcoded_term(term))
|
|
return NULL;
|
|
|
|
if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
|
|
if (term->val.num != 1)
|
|
return NULL;
|
|
if (pmu_find_format(&pmu->format, term->config))
|
|
return NULL;
|
|
name = term->config;
|
|
} else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
|
|
if (strcasecmp(term->config, "event"))
|
|
return NULL;
|
|
name = term->val.str;
|
|
} else {
|
|
return NULL;
|
|
}
|
|
|
|
list_for_each_entry(alias, &pmu->aliases, list) {
|
|
if (!strcasecmp(alias->name, name))
|
|
return alias;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
|
|
static int check_info_data(struct perf_pmu_alias *alias,
|
|
struct perf_pmu_info *info)
|
|
{
|
|
/*
|
|
* Only one term in event definition can
|
|
* define unit, scale and snapshot, fail
|
|
* if there's more than one.
|
|
*/
|
|
if ((info->unit && alias->unit[0]) ||
|
|
(info->scale && alias->scale) ||
|
|
(info->snapshot && alias->snapshot))
|
|
return -EINVAL;
|
|
|
|
if (alias->unit[0])
|
|
info->unit = alias->unit;
|
|
|
|
if (alias->scale)
|
|
info->scale = alias->scale;
|
|
|
|
if (alias->snapshot)
|
|
info->snapshot = alias->snapshot;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Find alias in the terms list and replace it with the terms
|
|
* defined for the alias
|
|
*/
|
|
int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
|
|
struct perf_pmu_info *info)
|
|
{
|
|
struct parse_events_term *term, *h;
|
|
struct perf_pmu_alias *alias;
|
|
int ret;
|
|
|
|
info->per_pkg = false;
|
|
|
|
/*
|
|
* Mark unit and scale as not set
|
|
* (different from default values, see below)
|
|
*/
|
|
info->unit = NULL;
|
|
info->scale = 0.0;
|
|
info->snapshot = false;
|
|
|
|
list_for_each_entry_safe(term, h, head_terms, list) {
|
|
alias = pmu_find_alias(pmu, term);
|
|
if (!alias)
|
|
continue;
|
|
ret = pmu_alias_terms(alias, &term->list);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = check_info_data(alias, info);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (alias->per_pkg)
|
|
info->per_pkg = true;
|
|
|
|
list_del_init(&term->list);
|
|
parse_events_term__delete(term);
|
|
}
|
|
|
|
/*
|
|
* if no unit or scale found in aliases, then
|
|
* set defaults as for evsel
|
|
* unit cannot left to NULL
|
|
*/
|
|
if (info->unit == NULL)
|
|
info->unit = "";
|
|
|
|
if (info->scale == 0.0)
|
|
info->scale = 1.0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int perf_pmu__new_format(struct list_head *list, char *name,
|
|
int config, unsigned long *bits)
|
|
{
|
|
struct perf_pmu_format *format;
|
|
|
|
format = zalloc(sizeof(*format));
|
|
if (!format)
|
|
return -ENOMEM;
|
|
|
|
format->name = strdup(name);
|
|
format->value = config;
|
|
memcpy(format->bits, bits, sizeof(format->bits));
|
|
|
|
list_add_tail(&format->list, list);
|
|
return 0;
|
|
}
|
|
|
|
void perf_pmu__set_format(unsigned long *bits, long from, long to)
|
|
{
|
|
long b;
|
|
|
|
if (!to)
|
|
to = from;
|
|
|
|
memset(bits, 0, BITS_TO_BYTES(PERF_PMU_FORMAT_BITS));
|
|
for (b = from; b <= to; b++)
|
|
__set_bit(b, bits);
|
|
}
|
|
|
|
void perf_pmu__del_formats(struct list_head *formats)
|
|
{
|
|
struct perf_pmu_format *fmt, *tmp;
|
|
|
|
list_for_each_entry_safe(fmt, tmp, formats, list) {
|
|
list_del(&fmt->list);
|
|
zfree(&fmt->name);
|
|
free(fmt);
|
|
}
|
|
}
|
|
|
|
bool perf_pmu__has_format(const struct perf_pmu *pmu, const char *name)
|
|
{
|
|
struct perf_pmu_format *format;
|
|
|
|
list_for_each_entry(format, &pmu->format, list) {
|
|
if (!strcmp(format->name, name))
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool is_pmu_core(const char *name)
|
|
{
|
|
return !strcmp(name, "cpu") || !strcmp(name, "cpum_cf") || is_sysfs_pmu_core(name);
|
|
}
|
|
|
|
bool perf_pmu__supports_legacy_cache(const struct perf_pmu *pmu)
|
|
{
|
|
return pmu->is_core;
|
|
}
|
|
|
|
bool perf_pmu__auto_merge_stats(const struct perf_pmu *pmu)
|
|
{
|
|
return !pmu->is_core || perf_pmus__num_core_pmus() == 1;
|
|
}
|
|
|
|
bool perf_pmu__have_event(const struct perf_pmu *pmu, const char *name)
|
|
{
|
|
struct perf_pmu_alias *alias;
|
|
|
|
list_for_each_entry(alias, &pmu->aliases, list) {
|
|
if (!strcmp(alias->name, name))
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool perf_pmu__is_software(const struct perf_pmu *pmu)
|
|
{
|
|
if (pmu->is_core || pmu->is_uncore || pmu->auxtrace)
|
|
return false;
|
|
switch (pmu->type) {
|
|
case PERF_TYPE_HARDWARE: return false;
|
|
case PERF_TYPE_SOFTWARE: return true;
|
|
case PERF_TYPE_TRACEPOINT: return true;
|
|
case PERF_TYPE_HW_CACHE: return false;
|
|
case PERF_TYPE_RAW: return false;
|
|
case PERF_TYPE_BREAKPOINT: return true;
|
|
default: break;
|
|
}
|
|
return !strcmp(pmu->name, "kprobe") || !strcmp(pmu->name, "uprobe");
|
|
}
|
|
|
|
FILE *perf_pmu__open_file(struct perf_pmu *pmu, const char *name)
|
|
{
|
|
char path[PATH_MAX];
|
|
|
|
if (!perf_pmu__pathname_scnprintf(path, sizeof(path), pmu->name, name) ||
|
|
!file_available(path))
|
|
return NULL;
|
|
|
|
return fopen(path, "r");
|
|
}
|
|
|
|
FILE *perf_pmu__open_file_at(struct perf_pmu *pmu, int dirfd, const char *name)
|
|
{
|
|
int fd;
|
|
|
|
fd = perf_pmu__pathname_fd(dirfd, pmu->name, name, O_RDONLY);
|
|
if (fd < 0)
|
|
return NULL;
|
|
|
|
return fdopen(fd, "r");
|
|
}
|
|
|
|
int perf_pmu__scan_file(struct perf_pmu *pmu, const char *name, const char *fmt,
|
|
...)
|
|
{
|
|
va_list args;
|
|
FILE *file;
|
|
int ret = EOF;
|
|
|
|
va_start(args, fmt);
|
|
file = perf_pmu__open_file(pmu, name);
|
|
if (file) {
|
|
ret = vfscanf(file, fmt, args);
|
|
fclose(file);
|
|
}
|
|
va_end(args);
|
|
return ret;
|
|
}
|
|
|
|
int perf_pmu__scan_file_at(struct perf_pmu *pmu, int dirfd, const char *name,
|
|
const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
FILE *file;
|
|
int ret = EOF;
|
|
|
|
va_start(args, fmt);
|
|
file = perf_pmu__open_file_at(pmu, dirfd, name);
|
|
if (file) {
|
|
ret = vfscanf(file, fmt, args);
|
|
fclose(file);
|
|
}
|
|
va_end(args);
|
|
return ret;
|
|
}
|
|
|
|
bool perf_pmu__file_exists(struct perf_pmu *pmu, const char *name)
|
|
{
|
|
char path[PATH_MAX];
|
|
|
|
if (!perf_pmu__pathname_scnprintf(path, sizeof(path), pmu->name, name))
|
|
return false;
|
|
|
|
return file_available(path);
|
|
}
|
|
|
|
static int perf_pmu__new_caps(struct list_head *list, char *name, char *value)
|
|
{
|
|
struct perf_pmu_caps *caps = zalloc(sizeof(*caps));
|
|
|
|
if (!caps)
|
|
return -ENOMEM;
|
|
|
|
caps->name = strdup(name);
|
|
if (!caps->name)
|
|
goto free_caps;
|
|
caps->value = strndup(value, strlen(value) - 1);
|
|
if (!caps->value)
|
|
goto free_name;
|
|
list_add_tail(&caps->list, list);
|
|
return 0;
|
|
|
|
free_name:
|
|
zfree(&caps->name);
|
|
free_caps:
|
|
free(caps);
|
|
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void perf_pmu__del_caps(struct perf_pmu *pmu)
|
|
{
|
|
struct perf_pmu_caps *caps, *tmp;
|
|
|
|
list_for_each_entry_safe(caps, tmp, &pmu->caps, list) {
|
|
list_del(&caps->list);
|
|
zfree(&caps->name);
|
|
zfree(&caps->value);
|
|
free(caps);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Reading/parsing the given pmu capabilities, which should be located at:
|
|
* /sys/bus/event_source/devices/<dev>/caps as sysfs group attributes.
|
|
* Return the number of capabilities
|
|
*/
|
|
int perf_pmu__caps_parse(struct perf_pmu *pmu)
|
|
{
|
|
struct stat st;
|
|
char caps_path[PATH_MAX];
|
|
DIR *caps_dir;
|
|
struct dirent *evt_ent;
|
|
int caps_fd;
|
|
|
|
if (pmu->caps_initialized)
|
|
return pmu->nr_caps;
|
|
|
|
pmu->nr_caps = 0;
|
|
|
|
if (!perf_pmu__pathname_scnprintf(caps_path, sizeof(caps_path), pmu->name, "caps"))
|
|
return -1;
|
|
|
|
if (stat(caps_path, &st) < 0) {
|
|
pmu->caps_initialized = true;
|
|
return 0; /* no error if caps does not exist */
|
|
}
|
|
|
|
caps_dir = opendir(caps_path);
|
|
if (!caps_dir)
|
|
return -EINVAL;
|
|
|
|
caps_fd = dirfd(caps_dir);
|
|
|
|
while ((evt_ent = readdir(caps_dir)) != NULL) {
|
|
char *name = evt_ent->d_name;
|
|
char value[128];
|
|
FILE *file;
|
|
int fd;
|
|
|
|
if (!strcmp(name, ".") || !strcmp(name, ".."))
|
|
continue;
|
|
|
|
fd = openat(caps_fd, name, O_RDONLY);
|
|
if (fd == -1)
|
|
continue;
|
|
file = fdopen(fd, "r");
|
|
if (!file) {
|
|
close(fd);
|
|
continue;
|
|
}
|
|
|
|
if (!fgets(value, sizeof(value), file) ||
|
|
(perf_pmu__new_caps(&pmu->caps, name, value) < 0)) {
|
|
fclose(file);
|
|
continue;
|
|
}
|
|
|
|
pmu->nr_caps++;
|
|
fclose(file);
|
|
}
|
|
|
|
closedir(caps_dir);
|
|
|
|
pmu->caps_initialized = true;
|
|
return pmu->nr_caps;
|
|
}
|
|
|
|
static void perf_pmu__compute_config_masks(struct perf_pmu *pmu)
|
|
{
|
|
struct perf_pmu_format *format;
|
|
|
|
if (pmu->config_masks_computed)
|
|
return;
|
|
|
|
list_for_each_entry(format, &pmu->format, list) {
|
|
unsigned int i;
|
|
__u64 *mask;
|
|
|
|
if (format->value >= PERF_PMU_FORMAT_VALUE_CONFIG_END)
|
|
continue;
|
|
|
|
pmu->config_masks_present = true;
|
|
mask = &pmu->config_masks[format->value];
|
|
|
|
for_each_set_bit(i, format->bits, PERF_PMU_FORMAT_BITS)
|
|
*mask |= 1ULL << i;
|
|
}
|
|
pmu->config_masks_computed = true;
|
|
}
|
|
|
|
void perf_pmu__warn_invalid_config(struct perf_pmu *pmu, __u64 config,
|
|
const char *name, int config_num,
|
|
const char *config_name)
|
|
{
|
|
__u64 bits;
|
|
char buf[100];
|
|
|
|
perf_pmu__compute_config_masks(pmu);
|
|
|
|
/*
|
|
* Kernel doesn't export any valid format bits.
|
|
*/
|
|
if (!pmu->config_masks_present)
|
|
return;
|
|
|
|
bits = config & ~pmu->config_masks[config_num];
|
|
if (bits == 0)
|
|
return;
|
|
|
|
bitmap_scnprintf((unsigned long *)&bits, sizeof(bits) * 8, buf, sizeof(buf));
|
|
|
|
pr_warning("WARNING: event '%s' not valid (bits %s of %s "
|
|
"'%llx' not supported by kernel)!\n",
|
|
name ?: "N/A", buf, config_name, config);
|
|
}
|
|
|
|
int perf_pmu__match(char *pattern, char *name, char *tok)
|
|
{
|
|
if (!name)
|
|
return -1;
|
|
|
|
if (fnmatch(pattern, name, 0))
|
|
return -1;
|
|
|
|
if (tok && !perf_pmu__match_ignoring_suffix(name, tok))
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
double __weak perf_pmu__cpu_slots_per_cycle(void)
|
|
{
|
|
return NAN;
|
|
}
|
|
|
|
int perf_pmu__event_source_devices_scnprintf(char *pathname, size_t size)
|
|
{
|
|
const char *sysfs = sysfs__mountpoint();
|
|
|
|
if (!sysfs)
|
|
return 0;
|
|
return scnprintf(pathname, size, "%s/bus/event_source/devices/", sysfs);
|
|
}
|
|
|
|
int perf_pmu__event_source_devices_fd(void)
|
|
{
|
|
char path[PATH_MAX];
|
|
const char *sysfs = sysfs__mountpoint();
|
|
|
|
if (!sysfs)
|
|
return -1;
|
|
|
|
scnprintf(path, sizeof(path), "%s/bus/event_source/devices/", sysfs);
|
|
return open(path, O_DIRECTORY);
|
|
}
|
|
|
|
/*
|
|
* Fill 'buf' with the path to a file or folder in 'pmu_name' in
|
|
* sysfs. For example if pmu_name = "cs_etm" and 'filename' = "format"
|
|
* then pathname will be filled with
|
|
* "/sys/bus/event_source/devices/cs_etm/format"
|
|
*
|
|
* Return 0 if the sysfs mountpoint couldn't be found or if no
|
|
* characters were written.
|
|
*/
|
|
int perf_pmu__pathname_scnprintf(char *buf, size_t size,
|
|
const char *pmu_name, const char *filename)
|
|
{
|
|
char base_path[PATH_MAX];
|
|
|
|
if (!perf_pmu__event_source_devices_scnprintf(base_path, sizeof(base_path)))
|
|
return 0;
|
|
return scnprintf(buf, size, "%s%s/%s", base_path, pmu_name, filename);
|
|
}
|
|
|
|
int perf_pmu__pathname_fd(int dirfd, const char *pmu_name, const char *filename, int flags)
|
|
{
|
|
char path[PATH_MAX];
|
|
|
|
scnprintf(path, sizeof(path), "%s/%s", pmu_name, filename);
|
|
return openat(dirfd, path, flags);
|
|
}
|
|
|
|
void perf_pmu__delete(struct perf_pmu *pmu)
|
|
{
|
|
perf_pmu__del_formats(&pmu->format);
|
|
perf_pmu__del_aliases(pmu);
|
|
perf_pmu__del_caps(pmu);
|
|
|
|
perf_cpu_map__put(pmu->cpus);
|
|
|
|
zfree(&pmu->default_config);
|
|
zfree(&pmu->name);
|
|
zfree(&pmu->alias_name);
|
|
free(pmu);
|
|
}
|