// SPDX-License-Identifier: GPL-2.0
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/*
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* The struct perf_event_attr test support.
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*
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* This test is embedded inside into perf directly and is governed
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* by the PERF_TEST_ATTR environment variable and hook inside
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* sys_perf_event_open function.
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*
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* The general idea is to store 'struct perf_event_attr' details for
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* each event created within single perf command. Each event details
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* are stored into separate text file. Once perf command is finished
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* these files can be checked for values we expect for command.
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*
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* Besides 'struct perf_event_attr' values we also store 'fd' and
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* 'group_fd' values to allow checking for groups created.
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*
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* This all is triggered by setting PERF_TEST_ATTR environment variable.
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* It must contain name of existing directory with access and write
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* permissions. All the event text files are stored there.
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*/
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#include <debug.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <sys/param.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 "../perf.h"
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#include <subcmd/exec-cmd.h>
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#include "tests.h"
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#define ENV "PERF_TEST_ATTR"
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static char *dir;
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static bool ready;
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void test_attr__init(void)
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{
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dir = getenv(ENV);
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test_attr__enabled = (dir != NULL);
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}
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#define BUFSIZE 1024
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#define __WRITE_ASS(str, fmt, data) \
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do { \
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char buf[BUFSIZE]; \
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size_t size; \
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\
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size = snprintf(buf, BUFSIZE, #str "=%"fmt "\n", data); \
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if (1 != fwrite(buf, size, 1, file)) { \
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perror("test attr - failed to write event file"); \
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fclose(file); \
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return -1; \
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} \
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\
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} while (0)
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#define WRITE_ASS(field, fmt) __WRITE_ASS(field, fmt, attr->field)
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static int store_event(struct perf_event_attr *attr, pid_t pid, int cpu,
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int fd, int group_fd, unsigned long flags)
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{
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FILE *file;
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char path[PATH_MAX];
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if (!ready)
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return 0;
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snprintf(path, PATH_MAX, "%s/event-%d-%llu-%d", dir,
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attr->type, attr->config, fd);
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file = fopen(path, "w+");
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if (!file) {
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perror("test attr - failed to open event file");
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return -1;
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}
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if (fprintf(file, "[event-%d-%llu-%d]\n",
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attr->type, attr->config, fd) < 0) {
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perror("test attr - failed to write event file");
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fclose(file);
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return -1;
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}
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/* syscall arguments */
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__WRITE_ASS(fd, "d", fd);
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__WRITE_ASS(group_fd, "d", group_fd);
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__WRITE_ASS(cpu, "d", cpu);
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__WRITE_ASS(pid, "d", pid);
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__WRITE_ASS(flags, "lu", flags);
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/* struct perf_event_attr */
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WRITE_ASS(type, PRIu32);
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WRITE_ASS(size, PRIu32);
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WRITE_ASS(config, "llu");
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WRITE_ASS(sample_period, "llu");
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WRITE_ASS(sample_type, "llu");
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WRITE_ASS(read_format, "llu");
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WRITE_ASS(disabled, "d");
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WRITE_ASS(inherit, "d");
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WRITE_ASS(pinned, "d");
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WRITE_ASS(exclusive, "d");
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WRITE_ASS(exclude_user, "d");
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WRITE_ASS(exclude_kernel, "d");
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WRITE_ASS(exclude_hv, "d");
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WRITE_ASS(exclude_idle, "d");
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WRITE_ASS(mmap, "d");
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WRITE_ASS(comm, "d");
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WRITE_ASS(freq, "d");
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WRITE_ASS(inherit_stat, "d");
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WRITE_ASS(enable_on_exec, "d");
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WRITE_ASS(task, "d");
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WRITE_ASS(watermark, "d");
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WRITE_ASS(precise_ip, "d");
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WRITE_ASS(mmap_data, "d");
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WRITE_ASS(sample_id_all, "d");
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WRITE_ASS(exclude_host, "d");
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WRITE_ASS(exclude_guest, "d");
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WRITE_ASS(exclude_callchain_kernel, "d");
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WRITE_ASS(exclude_callchain_user, "d");
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WRITE_ASS(mmap2, "d");
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WRITE_ASS(comm_exec, "d");
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WRITE_ASS(context_switch, "d");
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WRITE_ASS(write_backward, "d");
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WRITE_ASS(namespaces, "d");
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WRITE_ASS(use_clockid, "d");
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WRITE_ASS(wakeup_events, PRIu32);
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WRITE_ASS(bp_type, PRIu32);
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WRITE_ASS(config1, "llu");
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WRITE_ASS(config2, "llu");
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WRITE_ASS(branch_sample_type, "llu");
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WRITE_ASS(sample_regs_user, "llu");
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WRITE_ASS(sample_stack_user, PRIu32);
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fclose(file);
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return 0;
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}
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void test_attr__open(struct perf_event_attr *attr, pid_t pid, int cpu,
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int fd, int group_fd, unsigned long flags)
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{
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int errno_saved = errno;
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if ((fd != -1) && store_event(attr, pid, cpu, fd, group_fd, flags)) {
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pr_err("test attr FAILED");
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exit(128);
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}
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errno = errno_saved;
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}
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void test_attr__ready(void)
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{
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if (unlikely(test_attr__enabled) && !ready)
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ready = true;
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}
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static int run_dir(const char *d, const char *perf)
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{
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char v[] = "-vvvvv";
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int vcnt = min(verbose, (int) sizeof(v) - 1);
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char cmd[3*PATH_MAX];
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if (verbose > 0)
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vcnt++;
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scnprintf(cmd, 3*PATH_MAX, PYTHON " %s/attr.py -d %s/attr/ -p %s %.*s",
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d, d, perf, vcnt, v);
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return system(cmd) ? TEST_FAIL : TEST_OK;
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}
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int test__attr(struct test *test __maybe_unused, int subtest __maybe_unused)
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{
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struct stat st;
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char path_perf[PATH_MAX];
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char path_dir[PATH_MAX];
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/* First try developement tree tests. */
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if (!lstat("./tests", &st))
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return run_dir("./tests", "./perf");
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/* Then installed path. */
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snprintf(path_dir, PATH_MAX, "%s/tests", get_argv_exec_path());
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snprintf(path_perf, PATH_MAX, "%s/perf", BINDIR);
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if (!lstat(path_dir, &st) &&
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!lstat(path_perf, &st))
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return run_dir(path_dir, path_perf);
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return TEST_SKIP;
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}
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