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211 lines
5.3 KiB
211 lines
5.3 KiB
// 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 <subcmd/exec-cmd.h> |
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#include "event.h" |
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#include "util.h" |
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#include "tests.h" |
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#include "pmu.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, struct perf_cpu 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.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, struct perf_cpu 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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static int test__attr(struct test_suite *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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char *exec_path; |
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if (perf_pmu__has_hybrid()) |
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return TEST_SKIP; |
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/* First try development tree tests. */ |
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if (!lstat("./tests", &st)) |
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return run_dir("./tests", "./perf"); |
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exec_path = get_argv_exec_path(); |
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if (exec_path == NULL) |
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return -1; |
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/* Then installed path. */ |
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snprintf(path_dir, PATH_MAX, "%s/tests", exec_path); |
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snprintf(path_perf, PATH_MAX, "%s/perf", BINDIR); |
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free(exec_path); |
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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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DEFINE_SUITE("Setup struct perf_event_attr", attr);
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