selftests/bpf: skip nmi test when perf hw events are disabled

	return test_send_signal_common(&attr, BPF_PROG_TYPE_TRACEPOINT, "tracepoint");

}

static int test_send_signal_perf(void)

{

	struct perf_event_attr attr = {

		.sample_period = 1,

		.type = PERF_TYPE_SOFTWARE,

		.config = PERF_COUNT_SW_CPU_CLOCK,

	};

	return test_send_signal_common(&attr, BPF_PROG_TYPE_PERF_EVENT,

				       "perf_sw_event");

}

static int test_send_signal_nmi(void)

{

	struct perf_event_attr attr = {

		.type = PERF_TYPE_HARDWARE,

		.config = PERF_COUNT_HW_CPU_CYCLES,

	};

	int pmu_fd;

	/* Some setups (e.g. virtual machines) might run with hardware

	 * perf events disabled. If this is the case, skip this test.

	 */

	pmu_fd = syscall(__NR_perf_event_open, &attr, 0 /* pid */,

			 -1 /* cpu */, -1 /* group_fd */, 0 /* flags */);

	if (pmu_fd == -1) {

		if (errno == ENOENT) {

			printf("%s:SKIP:no PERF_COUNT_HW_CPU_CYCLES\n",

				__func__);

			return 0;

		}

		/* Let the test fail with a more informative message */

	} else {

		close(pmu_fd);

	}

	return test_send_signal_common(&attr, BPF_PROG_TYPE_PERF_EVENT, "perf_event");

	return test_send_signal_common(&attr, BPF_PROG_TYPE_PERF_EVENT,

				       "perf_hw_event");

}

void test_send_signal(void)

	int ret = 0;

	ret |= test_send_signal_tracepoint();

	ret |= test_send_signal_perf();

	ret |= test_send_signal_nmi();

	if (!ret)

		printf("test_send_signal:OK\n");