pmu.c

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// SPDX-License-Identifier: GPL-2.0
#include "parse-events.h"
#include "pmu.h"
#include "util.h"
#include "tests.h"
#include <errno.h>
#include <linux/kernel.h>

/* Simulated format definitions. */
static struct test_format {
    const char *name;
    const char *value;
} test_formats[] = {
    { "krava01", "config:0-1,62-63\n", },
    { "krava02", "config:10-17\n", },
    { "krava03", "config:5\n", },
    { "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", },
};

/* 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,
    },
};

/*
 * 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 < ARRAY_SIZE(test_formats); i++) {
        static char name[PATH_MAX];
        struct test_format *format = &test_formats[i];
        FILE *file;

        scnprintf(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 < ARRAY_SIZE(test_terms); i++)
        list_add_tail(&test_terms[i].list, &terms);

    return &terms;
}

int test__pmu(struct test *test __maybe_unused, int subtest __maybe_unused)
{
    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 = perf_pmu__format_parse(format, &formats);
        if (ret)
            break;

        ret = perf_pmu__config_terms(&formats, &attr, terms,
                         false, NULL);
        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;
}