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-rw-r--r--tools/perf/tests/bpf.c369
1 files changed, 369 insertions, 0 deletions
diff --git a/tools/perf/tests/bpf.c b/tools/perf/tests/bpf.c
new file mode 100644
index 000000000..e5832b74a
--- /dev/null
+++ b/tools/perf/tests/bpf.c
@@ -0,0 +1,369 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/epoll.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <util/record.h>
+#include <util/util.h>
+#include <util/bpf-loader.h>
+#include <util/evlist.h>
+#include <linux/bpf.h>
+#include <linux/filter.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <api/fs/fs.h>
+#include <bpf/bpf.h>
+#include <perf/mmap.h>
+#include "tests.h"
+#include "llvm.h"
+#include "debug.h"
+#include "parse-events.h"
+#include "util/mmap.h"
+#define NR_ITERS 111
+#define PERF_TEST_BPF_PATH "/sys/fs/bpf/perf_test"
+
+#ifdef HAVE_LIBBPF_SUPPORT
+
+static int epoll_pwait_loop(void)
+{
+ int i;
+
+ /* Should fail NR_ITERS times */
+ for (i = 0; i < NR_ITERS; i++)
+ epoll_pwait(-(i + 1), NULL, 0, 0, NULL);
+ return 0;
+}
+
+#ifdef HAVE_BPF_PROLOGUE
+
+static int llseek_loop(void)
+{
+ int fds[2], i;
+
+ fds[0] = open("/dev/null", O_RDONLY);
+ fds[1] = open("/dev/null", O_RDWR);
+
+ if (fds[0] < 0 || fds[1] < 0)
+ return -1;
+
+ for (i = 0; i < NR_ITERS; i++) {
+ lseek(fds[i % 2], i, (i / 2) % 2 ? SEEK_CUR : SEEK_SET);
+ lseek(fds[(i + 1) % 2], i, (i / 2) % 2 ? SEEK_CUR : SEEK_SET);
+ }
+ close(fds[0]);
+ close(fds[1]);
+ return 0;
+}
+
+#endif
+
+static struct {
+ enum test_llvm__testcase prog_id;
+ const char *desc;
+ const char *name;
+ const char *msg_compile_fail;
+ const char *msg_load_fail;
+ int (*target_func)(void);
+ int expect_result;
+ bool pin;
+} bpf_testcase_table[] = {
+ {
+ .prog_id = LLVM_TESTCASE_BASE,
+ .desc = "Basic BPF filtering",
+ .name = "[basic_bpf_test]",
+ .msg_compile_fail = "fix 'perf test LLVM' first",
+ .msg_load_fail = "load bpf object failed",
+ .target_func = &epoll_pwait_loop,
+ .expect_result = (NR_ITERS + 1) / 2,
+ },
+ {
+ .prog_id = LLVM_TESTCASE_BASE,
+ .desc = "BPF pinning",
+ .name = "[bpf_pinning]",
+ .msg_compile_fail = "fix kbuild first",
+ .msg_load_fail = "check your vmlinux setting?",
+ .target_func = &epoll_pwait_loop,
+ .expect_result = (NR_ITERS + 1) / 2,
+ .pin = true,
+ },
+#ifdef HAVE_BPF_PROLOGUE
+ {
+ .prog_id = LLVM_TESTCASE_BPF_PROLOGUE,
+ .desc = "BPF prologue generation",
+ .name = "[bpf_prologue_test]",
+ .msg_compile_fail = "fix kbuild first",
+ .msg_load_fail = "check your vmlinux setting?",
+ .target_func = &llseek_loop,
+ .expect_result = (NR_ITERS + 1) / 4,
+ },
+#endif
+ {
+ .prog_id = LLVM_TESTCASE_BPF_RELOCATION,
+ .desc = "BPF relocation checker",
+ .name = "[bpf_relocation_test]",
+ .msg_compile_fail = "fix 'perf test LLVM' first",
+ .msg_load_fail = "libbpf error when dealing with relocation",
+ },
+};
+
+static int do_test(struct bpf_object *obj, int (*func)(void),
+ int expect)
+{
+ struct record_opts opts = {
+ .target = {
+ .uid = UINT_MAX,
+ .uses_mmap = true,
+ },
+ .freq = 0,
+ .mmap_pages = 256,
+ .default_interval = 1,
+ };
+
+ char pid[16];
+ char sbuf[STRERR_BUFSIZE];
+ struct evlist *evlist;
+ int i, ret = TEST_FAIL, err = 0, count = 0;
+
+ struct parse_events_state parse_state;
+ struct parse_events_error parse_error;
+
+ bzero(&parse_error, sizeof(parse_error));
+ bzero(&parse_state, sizeof(parse_state));
+ parse_state.error = &parse_error;
+ INIT_LIST_HEAD(&parse_state.list);
+
+ err = parse_events_load_bpf_obj(&parse_state, &parse_state.list, obj, NULL);
+ if (err || list_empty(&parse_state.list)) {
+ pr_debug("Failed to add events selected by BPF\n");
+ return TEST_FAIL;
+ }
+
+ snprintf(pid, sizeof(pid), "%d", getpid());
+ pid[sizeof(pid) - 1] = '\0';
+ opts.target.tid = opts.target.pid = pid;
+
+ /* Instead of perf_evlist__new_default, don't add default events */
+ evlist = evlist__new();
+ if (!evlist) {
+ pr_debug("Not enough memory to create evlist\n");
+ return TEST_FAIL;
+ }
+
+ err = perf_evlist__create_maps(evlist, &opts.target);
+ if (err < 0) {
+ pr_debug("Not enough memory to create thread/cpu maps\n");
+ goto out_delete_evlist;
+ }
+
+ perf_evlist__splice_list_tail(evlist, &parse_state.list);
+ evlist->nr_groups = parse_state.nr_groups;
+
+ perf_evlist__config(evlist, &opts, NULL);
+
+ err = evlist__open(evlist);
+ if (err < 0) {
+ pr_debug("perf_evlist__open: %s\n",
+ str_error_r(errno, sbuf, sizeof(sbuf)));
+ goto out_delete_evlist;
+ }
+
+ err = evlist__mmap(evlist, opts.mmap_pages);
+ if (err < 0) {
+ pr_debug("evlist__mmap: %s\n",
+ str_error_r(errno, sbuf, sizeof(sbuf)));
+ goto out_delete_evlist;
+ }
+
+ evlist__enable(evlist);
+ (*func)();
+ evlist__disable(evlist);
+
+ for (i = 0; i < evlist->core.nr_mmaps; i++) {
+ union perf_event *event;
+ struct mmap *md;
+
+ md = &evlist->mmap[i];
+ if (perf_mmap__read_init(&md->core) < 0)
+ continue;
+
+ while ((event = perf_mmap__read_event(&md->core)) != NULL) {
+ const u32 type = event->header.type;
+
+ if (type == PERF_RECORD_SAMPLE)
+ count ++;
+ }
+ perf_mmap__read_done(&md->core);
+ }
+
+ if (count != expect * evlist->core.nr_entries) {
+ pr_debug("BPF filter result incorrect, expected %d, got %d samples\n", expect * evlist->core.nr_entries, count);
+ goto out_delete_evlist;
+ }
+
+ ret = TEST_OK;
+
+out_delete_evlist:
+ evlist__delete(evlist);
+ return ret;
+}
+
+static struct bpf_object *
+prepare_bpf(void *obj_buf, size_t obj_buf_sz, const char *name)
+{
+ struct bpf_object *obj;
+
+ obj = bpf__prepare_load_buffer(obj_buf, obj_buf_sz, name);
+ if (IS_ERR(obj)) {
+ pr_debug("Compile BPF program failed.\n");
+ return NULL;
+ }
+ return obj;
+}
+
+static int __test__bpf(int idx)
+{
+ int ret;
+ void *obj_buf;
+ size_t obj_buf_sz;
+ struct bpf_object *obj;
+
+ ret = test_llvm__fetch_bpf_obj(&obj_buf, &obj_buf_sz,
+ bpf_testcase_table[idx].prog_id,
+ true, NULL);
+ if (ret != TEST_OK || !obj_buf || !obj_buf_sz) {
+ pr_debug("Unable to get BPF object, %s\n",
+ bpf_testcase_table[idx].msg_compile_fail);
+ if (idx == 0)
+ return TEST_SKIP;
+ else
+ return TEST_FAIL;
+ }
+
+ obj = prepare_bpf(obj_buf, obj_buf_sz,
+ bpf_testcase_table[idx].name);
+ if ((!!bpf_testcase_table[idx].target_func) != (!!obj)) {
+ if (!obj)
+ pr_debug("Fail to load BPF object: %s\n",
+ bpf_testcase_table[idx].msg_load_fail);
+ else
+ pr_debug("Success unexpectedly: %s\n",
+ bpf_testcase_table[idx].msg_load_fail);
+ ret = TEST_FAIL;
+ goto out;
+ }
+
+ if (obj) {
+ ret = do_test(obj,
+ bpf_testcase_table[idx].target_func,
+ bpf_testcase_table[idx].expect_result);
+ if (ret != TEST_OK)
+ goto out;
+ if (bpf_testcase_table[idx].pin) {
+ int err;
+
+ if (!bpf_fs__mount()) {
+ pr_debug("BPF filesystem not mounted\n");
+ ret = TEST_FAIL;
+ goto out;
+ }
+ err = mkdir(PERF_TEST_BPF_PATH, 0777);
+ if (err && errno != EEXIST) {
+ pr_debug("Failed to make perf_test dir: %s\n",
+ strerror(errno));
+ ret = TEST_FAIL;
+ goto out;
+ }
+ if (bpf_object__pin(obj, PERF_TEST_BPF_PATH))
+ ret = TEST_FAIL;
+ if (rm_rf(PERF_TEST_BPF_PATH))
+ ret = TEST_FAIL;
+ }
+ }
+
+out:
+ free(obj_buf);
+ bpf__clear();
+ return ret;
+}
+
+int test__bpf_subtest_get_nr(void)
+{
+ return (int)ARRAY_SIZE(bpf_testcase_table);
+}
+
+const char *test__bpf_subtest_get_desc(int i)
+{
+ if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table))
+ return NULL;
+ return bpf_testcase_table[i].desc;
+}
+
+static int check_env(void)
+{
+ int err;
+ unsigned int kver_int;
+ char license[] = "GPL";
+
+ struct bpf_insn insns[] = {
+ BPF_MOV64_IMM(BPF_REG_0, 1),
+ BPF_EXIT_INSN(),
+ };
+
+ err = fetch_kernel_version(&kver_int, NULL, 0);
+ if (err) {
+ pr_debug("Unable to get kernel version\n");
+ return err;
+ }
+
+ err = bpf_load_program(BPF_PROG_TYPE_KPROBE, insns,
+ sizeof(insns) / sizeof(insns[0]),
+ license, kver_int, NULL, 0);
+ if (err < 0) {
+ pr_err("Missing basic BPF support, skip this test: %s\n",
+ strerror(errno));
+ return err;
+ }
+ close(err);
+
+ return 0;
+}
+
+int test__bpf(struct test *test __maybe_unused, int i)
+{
+ int err;
+
+ if (i < 0 || i >= (int)ARRAY_SIZE(bpf_testcase_table))
+ return TEST_FAIL;
+
+ if (geteuid() != 0) {
+ pr_debug("Only root can run BPF test\n");
+ return TEST_SKIP;
+ }
+
+ if (check_env())
+ return TEST_SKIP;
+
+ err = __test__bpf(i);
+ return err;
+}
+
+#else
+int test__bpf_subtest_get_nr(void)
+{
+ return 0;
+}
+
+const char *test__bpf_subtest_get_desc(int i __maybe_unused)
+{
+ return NULL;
+}
+
+int test__bpf(struct test *test __maybe_unused, int i __maybe_unused)
+{
+ pr_debug("Skip BPF test because BPF support is not compiled\n");
+ return TEST_SKIP;
+}
+#endif
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