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/*
* The struct perf_event_attr test support.
*
* This test is embedded inside into perf directly and is governed
* by the PERF_TEST_ATTR environment variable and hook inside
* sys_perf_event_open function.
*
* The general idea is to store 'struct perf_event_attr' details for
* each event created within single perf command. Each event details
* are stored into separate text file. Once perf command is finished
* these files can be checked for values we expect for command.
*
* Besides 'struct perf_event_attr' values we also store 'fd' and
* 'group_fd' values to allow checking for groups created.
*
* This all is triggered by setting PERF_TEST_ATTR environment variable.
* It must contain name of existing directory with access and write
* permissions. All the event text files are stored there.
*/
#include <stdlib.h>
#include <stdio.h>
#include <inttypes.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include "../perf.h"
#include "util.h"
#define ENV "PERF_TEST_ATTR"
bool test_attr__enabled;
static char *dir;
void test_attr__init(void)
{
dir = getenv(ENV);
test_attr__enabled = (dir != NULL);
}
#define BUFSIZE 1024
#define WRITE_ASS(str, fmt, data) \
do { \
char buf[BUFSIZE]; \
size_t size; \
\
size = snprintf(buf, BUFSIZE, #str "=%"fmt "\n", data); \
if (1 != fwrite(buf, size, 1, file)) { \
perror("test attr - failed to write event file"); \
fclose(file); \
return -1; \
} \
\
} while (0)
static int store_event(struct perf_event_attr *attr, pid_t pid, int cpu,
int fd, int group_fd, unsigned long flags)
{
FILE *file;
char path[PATH_MAX];
snprintf(path, PATH_MAX, "%s/event-%d-%llu-%d", dir,
attr->type, attr->config, fd);
file = fopen(path, "w+");
if (!file) {
perror("test attr - failed to open event file");
return -1;
}
if (fprintf(file, "[event-%d-%llu-%d]\n",
attr->type, attr->config, fd) < 0) {
perror("test attr - failed to write event file");
fclose(file);
return -1;
}
/* syscall arguments */
WRITE_ASS(fd, "d", fd);
WRITE_ASS(group_fd, "d", group_fd);
WRITE_ASS(cpu, "d", cpu);
WRITE_ASS(pid, "d", pid);
WRITE_ASS(flags, "lu", flags);
/* struct perf_event_attr */
WRITE_ASS(type, PRIu32, attr->type);
WRITE_ASS(size, PRIu32, attr->size);
WRITE_ASS(config, "llu", attr->config);
WRITE_ASS(sample_period, "llu", attr->sample_period);
WRITE_ASS(sample_type, "llu", attr->sample_type);
WRITE_ASS(read_format, "llu", attr->read_format);
WRITE_ASS(disabled, "d", attr->disabled);
WRITE_ASS(inherit, "d", attr->inherit);
WRITE_ASS(pinned, "d", attr->pinned);
WRITE_ASS(exclusive, "d", attr->exclusive);
WRITE_ASS(exclude_user, "d", attr->exclude_user);
WRITE_ASS(exclude_kernel, "d", attr->exclude_kernel);
WRITE_ASS(exclude_hv, "d", attr->exclude_hv);
WRITE_ASS(exclude_idle, "d", attr->exclude_idle);
WRITE_ASS(mmap, "d", attr->mmap);
WRITE_ASS(comm, "d", attr->comm);
WRITE_ASS(freq, "d", attr->freq);
WRITE_ASS(inherit_stat, "d", attr->inherit_stat);
WRITE_ASS(enable_on_exec, "d", attr->enable_on_exec);
WRITE_ASS(task, "d", attr->task);
WRITE_ASS(watermask, "d", attr->watermark);
WRITE_ASS(precise_ip, "d", attr->precise_ip);
WRITE_ASS(mmap_data, "d", attr->mmap_data);
WRITE_ASS(sample_id_all, "d", attr->sample_id_all);
WRITE_ASS(exclude_host, "d", attr->exclude_host);
WRITE_ASS(exclude_guest, "d", attr->exclude_guest);
WRITE_ASS(exclude_callchain_kernel, "d",
attr->exclude_callchain_kernel);
WRITE_ASS(exclude_callchain_user, "d",
attr->exclude_callchain_user);
WRITE_ASS(wakeup_events, PRIu32, attr->wakeup_events);
WRITE_ASS(bp_type, PRIu32, attr->bp_type);
WRITE_ASS(config1, "llu", attr->config1);
WRITE_ASS(config2, "llu", attr->config2);
WRITE_ASS(branch_sample_type, "llu", attr->branch_sample_type);
WRITE_ASS(sample_regs_user, "llu", attr->sample_regs_user);
WRITE_ASS(sample_stack_user, PRIu32, attr->sample_stack_user);
WRITE_ASS(optional, "d", 0);
fclose(file);
return 0;
}
void test_attr__open(struct perf_event_attr *attr, pid_t pid, int cpu,
int fd, int group_fd, unsigned long flags)
{
int errno_saved = errno;
if (store_event(attr, pid, cpu, fd, group_fd, flags))
die("test attr FAILED");
errno = errno_saved;
}
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