perf tools: Add perf pmu object to access pmu format definition
Adding pmu object which provides interface to pmu's sysfs
event format definition located at:
${sysfs_mount}/bus/event_source/devices/${pmu}/format
Following interface is exported:
struct perf_pmu* perf_pmu__find(char *name);
- this function returns pmu object, which is then
passed as a handle to other interface functions
int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
struct list_head *head_terms);
- this function configures perf_event_attr struct based
on pmu's format definitions and config terms data,
containined in head_terms list.
Parser generator is used to retrive the pmu's format definition.
The generated parser is part of the patch. Added makefile rule
'pmu-parser' to generate the parser code out of the bison/flex
sources.
Added builtin test 'Test perf pmu format parsing', which could
be run like:
perf test pmu
Acked-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/n/tip-errz96u1668gj9wlop1zhpht@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa
Arnaldo Carvalho de Melo
parent
8f707d843c
commit
cd82a32e99
10 changed files with 4541 additions and 0 deletions
469
tools/perf/util/pmu.c
Normal file
469
tools/perf/util/pmu.c
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@ -0,0 +1,469 @@
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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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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/bus/event_source/devices/%s/format", sysfs, name);
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if (stat(path, &st) < 0)
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return -1;
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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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/*
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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/bus/event_source/devices/%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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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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__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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INIT_LIST_HEAD(&pmu->format);
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list_splice(&format, &pmu->format);
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pmu->name = strdup(name);
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pmu->type = type;
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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__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 != 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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*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, *h;
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list_for_each_entry_safe(term, h, 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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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", },
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{ "krava12", "config1:63\n", },
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{ "krava13", "config1:45-47\n", },
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{ "krava21", "config2:0-3,10-13,20-23,30-33,40-43,50-53,60-63\n", },
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{ "krava22", "config2:8,18,48,58\n", },
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{ "krava23", "config2:28-29,38\n", },
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};
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#define TEST_FORMATS_CNT (sizeof(test_formats) / sizeof(struct test_format))
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/* Simulated users input. */
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static struct parse_events__term test_terms[] = {
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{
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.config = (char *) "krava01",
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.val.num = 15,
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.type = PARSE_EVENTS__TERM_TYPE_NUM,
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},
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{
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.config = (char *) "krava02",
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.val.num = 170,
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.type = PARSE_EVENTS__TERM_TYPE_NUM,
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},
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{
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.config = (char *) "krava03",
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.val.num = 1,
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.type = PARSE_EVENTS__TERM_TYPE_NUM,
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},
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{
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.config = (char *) "krava11",
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.val.num = 27,
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.type = PARSE_EVENTS__TERM_TYPE_NUM,
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},
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{
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.config = (char *) "krava12",
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.val.num = 1,
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.type = PARSE_EVENTS__TERM_TYPE_NUM,
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},
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{
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.config = (char *) "krava13",
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.val.num = 2,
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.type = PARSE_EVENTS__TERM_TYPE_NUM,
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},
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{
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.config = (char *) "krava21",
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.val.num = 119,
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.type = PARSE_EVENTS__TERM_TYPE_NUM,
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},
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{
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.config = (char *) "krava22",
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.val.num = 11,
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.type = PARSE_EVENTS__TERM_TYPE_NUM,
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},
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{
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.config = (char *) "krava23",
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.val.num = 2,
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.type = PARSE_EVENTS__TERM_TYPE_NUM,
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},
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};
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#define TERMS_CNT (sizeof(test_terms) / sizeof(struct parse_events__term))
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/*
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* Prepare format directory data, exported by kernel
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* at /sys/bus/event_source/devices/<dev>/format.
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*/
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static char *test_format_dir_get(void)
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{
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static char dir[PATH_MAX];
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unsigned int i;
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snprintf(dir, PATH_MAX, "/tmp/perf-pmu-test-format-XXXXXX");
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if (!mkdtemp(dir))
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return NULL;
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for (i = 0; i < TEST_FORMATS_CNT; i++) {
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static char name[PATH_MAX];
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struct test_format *format = &test_formats[i];
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FILE *file;
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snprintf(name, PATH_MAX, "%s/%s", dir, format->name);
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file = fopen(name, "w");
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if (!file)
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return NULL;
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if (1 != fwrite(format->value, strlen(format->value), 1, file))
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break;
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fclose(file);
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}
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return dir;
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}
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/* Cleanup format directory. */
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static int test_format_dir_put(char *dir)
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{
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char buf[PATH_MAX];
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snprintf(buf, PATH_MAX, "rm -f %s/*\n", dir);
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if (system(buf))
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return -1;
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snprintf(buf, PATH_MAX, "rmdir %s\n", dir);
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return system(buf);
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}
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static struct list_head *test_terms_list(void)
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{
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static LIST_HEAD(terms);
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unsigned int i;
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for (i = 0; i < TERMS_CNT; i++)
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list_add_tail(&test_terms[i].list, &terms);
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return &terms;
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}
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#undef TERMS_CNT
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int perf_pmu__test(void)
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{
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char *format = test_format_dir_get();
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LIST_HEAD(formats);
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struct list_head *terms = test_terms_list();
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int ret;
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if (!format)
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return -EINVAL;
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do {
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struct perf_event_attr attr;
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memset(&attr, 0, sizeof(attr));
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ret = pmu_format_parse(format, &formats);
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if (ret)
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break;
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ret = pmu_config(&formats, &attr, terms);
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if (ret)
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break;
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ret = -EINVAL;
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if (attr.config != 0xc00000000002a823)
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break;
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if (attr.config1 != 0x8000400000000145)
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break;
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if (attr.config2 != 0x0400000020041d07)
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break;
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ret = 0;
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} while (0);
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test_format_dir_put(format);
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return ret;
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}
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