--- /dev/null
+#include <stdio.h>
+#include <sys/epoll.h>
+#include <util/bpf-loader.h>
+#include <util/evlist.h>
+#include "tests.h"
+#include "llvm.h"
+#include "debug.h"
+#define NR_ITERS 111
+
+#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;
+}
+
+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;
+} bpf_testcase_table[] = {
+ {
+ LLVM_TESTCASE_BASE,
+ "Test basic BPF filtering",
+ "[basic_bpf_test]",
+ "fix 'perf test LLVM' first",
+ "load bpf object failed",
+ &epoll_pwait_loop,
+ (NR_ITERS + 1) / 2,
+ },
+};
+
+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 perf_evlist *evlist;
+ int i, ret = TEST_FAIL, err = 0, count = 0;
+
+ struct parse_events_evlist parse_evlist;
+ struct parse_events_error parse_error;
+
+ bzero(&parse_error, sizeof(parse_error));
+ bzero(&parse_evlist, sizeof(parse_evlist));
+ parse_evlist.error = &parse_error;
+ INIT_LIST_HEAD(&parse_evlist.list);
+
+ err = parse_events_load_bpf_obj(&parse_evlist, &parse_evlist.list, obj);
+ if (err || list_empty(&parse_evlist.list)) {
+ pr_debug("Failed to add events selected by BPF\n");
+ if (!err)
+ 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 = perf_evlist__new();
+ if (!evlist) {
+ pr_debug("No ehough 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_evlist.list);
+ evlist->nr_groups = parse_evlist.nr_groups;
+
+ perf_evlist__config(evlist, &opts);
+
+ err = perf_evlist__open(evlist);
+ if (err < 0) {
+ pr_debug("perf_evlist__open: %s\n",
+ strerror_r(errno, sbuf, sizeof(sbuf)));
+ goto out_delete_evlist;
+ }
+
+ err = perf_evlist__mmap(evlist, opts.mmap_pages, false);
+ if (err < 0) {
+ pr_debug("perf_evlist__mmap: %s\n",
+ strerror_r(errno, sbuf, sizeof(sbuf)));
+ goto out_delete_evlist;
+ }
+
+ perf_evlist__enable(evlist);
+ (*func)();
+ perf_evlist__disable(evlist);
+
+ for (i = 0; i < evlist->nr_mmaps; i++) {
+ union perf_event *event;
+
+ while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
+ const u32 type = event->header.type;
+
+ if (type == PERF_RECORD_SAMPLE)
+ count ++;
+ }
+ }
+
+ if (count != expect)
+ pr_debug("BPF filter result incorrect\n");
+
+ ret = TEST_OK;
+
+out_delete_evlist:
+ perf_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 index)
+{
+ 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[index].prog_id,
+ true);
+ if (ret != TEST_OK || !obj_buf || !obj_buf_sz) {
+ pr_debug("Unable to get BPF object, %s\n",
+ bpf_testcase_table[index].msg_compile_fail);
+ if (index == 0)
+ return TEST_SKIP;
+ else
+ return TEST_FAIL;
+ }
+
+ obj = prepare_bpf(obj_buf, obj_buf_sz,
+ bpf_testcase_table[index].name);
+ if (!obj) {
+ ret = TEST_FAIL;
+ goto out;
+ }
+
+ ret = do_test(obj,
+ bpf_testcase_table[index].target_func,
+ bpf_testcase_table[index].expect_result);
+out:
+ bpf__clear();
+ return ret;
+}
+
+int test__bpf(void)
+{
+ unsigned int i;
+ int err;
+
+ if (geteuid() != 0) {
+ pr_debug("Only root can run BPF test\n");
+ return TEST_SKIP;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(bpf_testcase_table); i++) {
+ err = __test__bpf(i);
+
+ if (err != TEST_OK)
+ return err;
+ }
+
+ return TEST_OK;
+}
+
+#else
+int test__bpf(void)
+{
+ pr_debug("Skip BPF test because BPF support is not compiled\n");
+ return TEST_SKIP;
+}
+#endif
projects / mirror_ubuntu-kernels.git / commitdiff