mirror of
https://github.com/edk2-porting/linux-next.git
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7ae92e744e
If user doesn't explicitly specify CPU list, perf-stat only collects events on CPUs listed in the PMU cpumask file. Signed-off-by: "Yah, Zheng" <zheng.z.yan@intel.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1347263631-23175-3-git-send-email-zheng.z.yan@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
727 lines
15 KiB
C
727 lines
15 KiB
C
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#include <linux/list.h>
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#include <sys/types.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 <dirent.h>
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#include "sysfs.h"
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#include "util.h"
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#include "pmu.h"
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#include "parse-events.h"
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#include "cpumap.h"
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#define EVENT_SOURCE_DEVICE_PATH "/bus/event_source/devices/"
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int perf_pmu_parse(struct list_head *list, char *name);
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extern FILE *perf_pmu_in;
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static LIST_HEAD(pmus);
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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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static int pmu_format_parse(char *dir, 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 = opendir(dir);
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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 path[PATH_MAX];
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char *name = evt_ent->d_name;
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FILE *file;
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if (!strcmp(name, ".") || !strcmp(name, ".."))
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continue;
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snprintf(path, PATH_MAX, "%s/%s", dir, name);
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ret = -EINVAL;
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file = fopen(path, "r");
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if (!file)
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break;
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perf_pmu_in = file;
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ret = perf_pmu_parse(head, name);
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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(char *name, struct list_head *format)
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{
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struct stat st;
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char path[PATH_MAX];
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const char *sysfs;
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sysfs = sysfs_find_mountpoint();
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if (!sysfs)
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return -1;
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snprintf(path, PATH_MAX,
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"%s" EVENT_SOURCE_DEVICE_PATH "%s/format", sysfs, name);
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if (stat(path, &st) < 0)
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return 0; /* no error if format does not exist */
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if (pmu_format_parse(path, format))
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return -1;
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return 0;
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}
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static int perf_pmu__new_alias(struct list_head *list, char *name, FILE *file)
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{
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struct perf_pmu__alias *alias;
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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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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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ret = parse_events_terms(&alias->terms, buf);
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if (ret) {
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free(alias);
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return ret;
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}
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alias->name = strdup(name);
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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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* Process all the sysfs attributes located under the directory
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* specified in 'dir' parameter.
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*/
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static int pmu_aliases_parse(char *dir, struct list_head *head)
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{
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struct dirent *evt_ent;
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DIR *event_dir;
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int ret = 0;
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event_dir = opendir(dir);
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if (!event_dir)
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return -EINVAL;
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while (!ret && (evt_ent = readdir(event_dir))) {
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char path[PATH_MAX];
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char *name = evt_ent->d_name;
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FILE *file;
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if (!strcmp(name, ".") || !strcmp(name, ".."))
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continue;
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snprintf(path, PATH_MAX, "%s/%s", dir, name);
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ret = -EINVAL;
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file = fopen(path, "r");
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if (!file)
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break;
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ret = perf_pmu__new_alias(head, name, file);
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fclose(file);
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}
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closedir(event_dir);
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return ret;
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}
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/*
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* Reading the pmu event aliases definition, which should be located at:
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* /sys/bus/event_source/devices/<dev>/events as sysfs group attributes.
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*/
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static int pmu_aliases(char *name, struct list_head *head)
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{
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struct stat st;
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char path[PATH_MAX];
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const char *sysfs;
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sysfs = sysfs_find_mountpoint();
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if (!sysfs)
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return -1;
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snprintf(path, PATH_MAX,
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"%s/bus/event_source/devices/%s/events", sysfs, name);
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if (stat(path, &st) < 0)
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return -1;
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if (pmu_aliases_parse(path, head))
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return -1;
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return 0;
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}
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static int pmu_alias_terms(struct perf_pmu__alias *alias,
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struct list_head *terms)
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{
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struct parse_events__term *term, *clone;
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LIST_HEAD(list);
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int ret;
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list_for_each_entry(term, &alias->terms, list) {
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ret = parse_events__term_clone(&clone, term);
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if (ret) {
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parse_events__free_terms(&list);
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return ret;
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}
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list_add_tail(&clone->list, &list);
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}
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list_splice(&list, terms);
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return 0;
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}
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/*
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* Reading/parsing the default pmu type value, which should be
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* located at:
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* /sys/bus/event_source/devices/<dev>/type as sysfs attribute.
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*/
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static int pmu_type(char *name, __u32 *type)
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{
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struct stat st;
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char path[PATH_MAX];
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const char *sysfs;
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FILE *file;
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int ret = 0;
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sysfs = sysfs_find_mountpoint();
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if (!sysfs)
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return -1;
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snprintf(path, PATH_MAX,
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"%s" EVENT_SOURCE_DEVICE_PATH "%s/type", sysfs, name);
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if (stat(path, &st) < 0)
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return -1;
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file = fopen(path, "r");
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if (!file)
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return -EINVAL;
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if (1 != fscanf(file, "%u", type))
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ret = -1;
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fclose(file);
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return ret;
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}
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/* Add all pmus in sysfs to pmu list: */
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static void pmu_read_sysfs(void)
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{
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char path[PATH_MAX];
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const char *sysfs;
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DIR *dir;
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struct dirent *dent;
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sysfs = sysfs_find_mountpoint();
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if (!sysfs)
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return;
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snprintf(path, PATH_MAX,
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"%s" EVENT_SOURCE_DEVICE_PATH, sysfs);
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dir = opendir(path);
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if (!dir)
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return;
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while ((dent = readdir(dir))) {
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if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, ".."))
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continue;
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/* add to static LIST_HEAD(pmus): */
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perf_pmu__find(dent->d_name);
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}
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closedir(dir);
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}
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static struct cpu_map *pmu_cpumask(char *name)
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{
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struct stat st;
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char path[PATH_MAX];
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const char *sysfs;
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FILE *file;
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struct cpu_map *cpus;
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sysfs = sysfs_find_mountpoint();
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if (!sysfs)
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return NULL;
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snprintf(path, PATH_MAX,
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"%s/bus/event_source/devices/%s/cpumask", sysfs, name);
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if (stat(path, &st) < 0)
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return NULL;
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file = fopen(path, "r");
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if (!file)
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return NULL;
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cpus = cpu_map__read(file);
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fclose(file);
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return cpus;
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}
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static struct perf_pmu *pmu_lookup(char *name)
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{
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struct perf_pmu *pmu;
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LIST_HEAD(format);
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LIST_HEAD(aliases);
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__u32 type;
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/*
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* The pmu data we store & need consists of the pmu
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* type value and format definitions. Load both right
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* now.
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*/
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if (pmu_format(name, &format))
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return NULL;
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if (pmu_type(name, &type))
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return NULL;
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pmu = zalloc(sizeof(*pmu));
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if (!pmu)
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return NULL;
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pmu->cpus = pmu_cpumask(name);
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pmu_aliases(name, &aliases);
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INIT_LIST_HEAD(&pmu->format);
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INIT_LIST_HEAD(&pmu->aliases);
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list_splice(&format, &pmu->format);
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list_splice(&aliases, &pmu->aliases);
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pmu->name = strdup(name);
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pmu->type = type;
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list_add_tail(&pmu->list, &pmus);
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return pmu;
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}
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static struct perf_pmu *pmu_find(char *name)
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{
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struct perf_pmu *pmu;
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list_for_each_entry(pmu, &pmus, list)
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if (!strcmp(pmu->name, name))
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return pmu;
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return NULL;
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}
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struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu)
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{
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/*
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* pmu iterator: If pmu is NULL, we start at the begin,
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* otherwise return the next pmu. Returns NULL on end.
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*/
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if (!pmu) {
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pmu_read_sysfs();
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pmu = list_prepare_entry(pmu, &pmus, list);
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}
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list_for_each_entry_continue(pmu, &pmus, list)
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return pmu;
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return NULL;
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}
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struct perf_pmu *perf_pmu__find(char *name)
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{
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struct perf_pmu *pmu;
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/*
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* Once PMU is loaded it stays in the list,
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* so we keep us from multiple reading/parsing
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* the pmu format definitions.
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*/
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pmu = pmu_find(name);
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if (pmu)
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return pmu;
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return pmu_lookup(name);
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}
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static struct perf_pmu__format*
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pmu_find_format(struct list_head *formats, char *name)
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{
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struct perf_pmu__format *format;
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list_for_each_entry(format, formats, list)
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if (!strcmp(format->name, name))
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return format;
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return NULL;
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}
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/*
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* Returns value based on the format definition (format parameter)
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* and unformated value (value parameter).
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*
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* TODO maybe optimize a little ;)
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*/
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static __u64 pmu_format_value(unsigned long *format, __u64 value)
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{
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unsigned long fbit, vbit;
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__u64 v = 0;
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for (fbit = 0, vbit = 0; fbit < PERF_PMU_FORMAT_BITS; fbit++) {
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if (!test_bit(fbit, format))
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continue;
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if (!(value & (1llu << vbit++)))
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continue;
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v |= (1llu << fbit);
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}
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return v;
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}
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/*
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* Setup one of config[12] attr members based on the
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* user input data - temr parameter.
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*/
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static int pmu_config_term(struct list_head *formats,
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struct perf_event_attr *attr,
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struct parse_events__term *term)
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{
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struct perf_pmu__format *format;
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__u64 *vp;
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/*
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* Support only for hardcoded and numnerial terms.
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* Hardcoded terms should be already in, so nothing
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* to be done for them.
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*/
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if (parse_events__is_hardcoded_term(term))
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return 0;
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if (term->type_val != PARSE_EVENTS__TERM_TYPE_NUM)
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return -EINVAL;
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format = pmu_find_format(formats, term->config);
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if (!format)
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return -EINVAL;
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switch (format->value) {
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case PERF_PMU_FORMAT_VALUE_CONFIG:
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vp = &attr->config;
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break;
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case PERF_PMU_FORMAT_VALUE_CONFIG1:
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vp = &attr->config1;
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break;
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case PERF_PMU_FORMAT_VALUE_CONFIG2:
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vp = &attr->config2;
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break;
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default:
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return -EINVAL;
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}
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/*
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* XXX If we ever decide to go with string values for
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* non-hardcoded terms, here's the place to translate
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* them into value.
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*/
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*vp |= pmu_format_value(format->bits, term->val.num);
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return 0;
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}
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static int pmu_config(struct list_head *formats, struct perf_event_attr *attr,
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struct list_head *head_terms)
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{
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struct parse_events__term *term;
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list_for_each_entry(term, head_terms, list)
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if (pmu_config_term(formats, attr, term))
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return -EINVAL;
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return 0;
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}
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/*
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* Configures event's 'attr' parameter based on the:
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* 1) users input - specified in terms parameter
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* 2) pmu format definitions - specified by pmu parameter
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*/
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int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
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struct list_head *head_terms)
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{
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attr->type = pmu->type;
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return pmu_config(&pmu->format, attr, head_terms);
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}
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static struct perf_pmu__alias *pmu_find_alias(struct perf_pmu *pmu,
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struct parse_events__term *term)
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{
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struct perf_pmu__alias *alias;
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char *name;
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if (parse_events__is_hardcoded_term(term))
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return NULL;
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if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
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if (term->val.num != 1)
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return NULL;
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if (pmu_find_format(&pmu->format, term->config))
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return NULL;
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name = term->config;
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} else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
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if (strcasecmp(term->config, "event"))
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return NULL;
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name = term->val.str;
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} else {
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return NULL;
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}
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list_for_each_entry(alias, &pmu->aliases, list) {
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if (!strcasecmp(alias->name, name))
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return alias;
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}
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return NULL;
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}
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/*
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* Find alias in the terms list and replace it with the terms
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* defined for the alias
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*/
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int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms)
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{
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struct parse_events__term *term, *h;
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struct perf_pmu__alias *alias;
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int ret;
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list_for_each_entry_safe(term, h, head_terms, list) {
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alias = pmu_find_alias(pmu, term);
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if (!alias)
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continue;
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ret = pmu_alias_terms(alias, &term->list);
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if (ret)
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return ret;
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list_del(&term->list);
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free(term);
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}
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return 0;
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}
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int perf_pmu__new_format(struct list_head *list, char *name,
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int config, unsigned long *bits)
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{
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struct perf_pmu__format *format;
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format = zalloc(sizeof(*format));
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if (!format)
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return -ENOMEM;
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format->name = strdup(name);
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format->value = config;
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memcpy(format->bits, bits, sizeof(format->bits));
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list_add_tail(&format->list, list);
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return 0;
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}
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void perf_pmu__set_format(unsigned long *bits, long from, long to)
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{
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long b;
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if (!to)
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to = from;
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memset(bits, 0, BITS_TO_LONGS(PERF_PMU_FORMAT_BITS));
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for (b = from; b <= to; b++)
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set_bit(b, bits);
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}
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/* Simulated format definitions. */
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static struct test_format {
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const char *name;
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const char *value;
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} test_formats[] = {
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{ "krava01", "config:0-1,62-63\n", },
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{ "krava02", "config:10-17\n", },
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{ "krava03", "config:5\n", },
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{ "krava11", "config1:0,2,4,6,8,20-28\n", },
|
|
{ "krava12", "config1:63\n", },
|
|
{ "krava13", "config1:45-47\n", },
|
|
{ "krava21", "config2:0-3,10-13,20-23,30-33,40-43,50-53,60-63\n", },
|
|
{ "krava22", "config2:8,18,48,58\n", },
|
|
{ "krava23", "config2:28-29,38\n", },
|
|
};
|
|
|
|
#define TEST_FORMATS_CNT (sizeof(test_formats) / sizeof(struct test_format))
|
|
|
|
/* Simulated users input. */
|
|
static struct parse_events__term test_terms[] = {
|
|
{
|
|
.config = (char *) "krava01",
|
|
.val.num = 15,
|
|
.type_val = PARSE_EVENTS__TERM_TYPE_NUM,
|
|
.type_term = PARSE_EVENTS__TERM_TYPE_USER,
|
|
},
|
|
{
|
|
.config = (char *) "krava02",
|
|
.val.num = 170,
|
|
.type_val = PARSE_EVENTS__TERM_TYPE_NUM,
|
|
.type_term = PARSE_EVENTS__TERM_TYPE_USER,
|
|
},
|
|
{
|
|
.config = (char *) "krava03",
|
|
.val.num = 1,
|
|
.type_val = PARSE_EVENTS__TERM_TYPE_NUM,
|
|
.type_term = PARSE_EVENTS__TERM_TYPE_USER,
|
|
},
|
|
{
|
|
.config = (char *) "krava11",
|
|
.val.num = 27,
|
|
.type_val = PARSE_EVENTS__TERM_TYPE_NUM,
|
|
.type_term = PARSE_EVENTS__TERM_TYPE_USER,
|
|
},
|
|
{
|
|
.config = (char *) "krava12",
|
|
.val.num = 1,
|
|
.type_val = PARSE_EVENTS__TERM_TYPE_NUM,
|
|
.type_term = PARSE_EVENTS__TERM_TYPE_USER,
|
|
},
|
|
{
|
|
.config = (char *) "krava13",
|
|
.val.num = 2,
|
|
.type_val = PARSE_EVENTS__TERM_TYPE_NUM,
|
|
.type_term = PARSE_EVENTS__TERM_TYPE_USER,
|
|
},
|
|
{
|
|
.config = (char *) "krava21",
|
|
.val.num = 119,
|
|
.type_val = PARSE_EVENTS__TERM_TYPE_NUM,
|
|
.type_term = PARSE_EVENTS__TERM_TYPE_USER,
|
|
},
|
|
{
|
|
.config = (char *) "krava22",
|
|
.val.num = 11,
|
|
.type_val = PARSE_EVENTS__TERM_TYPE_NUM,
|
|
.type_term = PARSE_EVENTS__TERM_TYPE_USER,
|
|
},
|
|
{
|
|
.config = (char *) "krava23",
|
|
.val.num = 2,
|
|
.type_val = PARSE_EVENTS__TERM_TYPE_NUM,
|
|
.type_term = PARSE_EVENTS__TERM_TYPE_USER,
|
|
},
|
|
};
|
|
#define TERMS_CNT (sizeof(test_terms) / sizeof(struct parse_events__term))
|
|
|
|
/*
|
|
* Prepare format directory data, exported by kernel
|
|
* at /sys/bus/event_source/devices/<dev>/format.
|
|
*/
|
|
static char *test_format_dir_get(void)
|
|
{
|
|
static char dir[PATH_MAX];
|
|
unsigned int i;
|
|
|
|
snprintf(dir, PATH_MAX, "/tmp/perf-pmu-test-format-XXXXXX");
|
|
if (!mkdtemp(dir))
|
|
return NULL;
|
|
|
|
for (i = 0; i < TEST_FORMATS_CNT; i++) {
|
|
static char name[PATH_MAX];
|
|
struct test_format *format = &test_formats[i];
|
|
FILE *file;
|
|
|
|
snprintf(name, PATH_MAX, "%s/%s", dir, format->name);
|
|
|
|
file = fopen(name, "w");
|
|
if (!file)
|
|
return NULL;
|
|
|
|
if (1 != fwrite(format->value, strlen(format->value), 1, file))
|
|
break;
|
|
|
|
fclose(file);
|
|
}
|
|
|
|
return dir;
|
|
}
|
|
|
|
/* Cleanup format directory. */
|
|
static int test_format_dir_put(char *dir)
|
|
{
|
|
char buf[PATH_MAX];
|
|
snprintf(buf, PATH_MAX, "rm -f %s/*\n", dir);
|
|
if (system(buf))
|
|
return -1;
|
|
|
|
snprintf(buf, PATH_MAX, "rmdir %s\n", dir);
|
|
return system(buf);
|
|
}
|
|
|
|
static struct list_head *test_terms_list(void)
|
|
{
|
|
static LIST_HEAD(terms);
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < TERMS_CNT; i++)
|
|
list_add_tail(&test_terms[i].list, &terms);
|
|
|
|
return &terms;
|
|
}
|
|
|
|
#undef TERMS_CNT
|
|
|
|
int perf_pmu__test(void)
|
|
{
|
|
char *format = test_format_dir_get();
|
|
LIST_HEAD(formats);
|
|
struct list_head *terms = test_terms_list();
|
|
int ret;
|
|
|
|
if (!format)
|
|
return -EINVAL;
|
|
|
|
do {
|
|
struct perf_event_attr attr;
|
|
|
|
memset(&attr, 0, sizeof(attr));
|
|
|
|
ret = pmu_format_parse(format, &formats);
|
|
if (ret)
|
|
break;
|
|
|
|
ret = pmu_config(&formats, &attr, terms);
|
|
if (ret)
|
|
break;
|
|
|
|
ret = -EINVAL;
|
|
|
|
if (attr.config != 0xc00000000002a823)
|
|
break;
|
|
if (attr.config1 != 0x8000400000000145)
|
|
break;
|
|
if (attr.config2 != 0x0400000020041d07)
|
|
break;
|
|
|
|
ret = 0;
|
|
} while (0);
|
|
|
|
test_format_dir_put(format);
|
|
return ret;
|
|
}
|