1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright 2014, Michael Ellerman, IBM Corp.
4  */
5 
6 #include <stdio.h>
7 #include <stdlib.h>
8 #include <setjmp.h>
9 #include <signal.h>
10 
11 #include "ebb.h"
12 
13 
14 /* Test that things work sanely if we have no handler */
15 
no_handler_test(void)16 static int no_handler_test(void)
17 {
18 	struct event event;
19 	u64 val;
20 	int i;
21 
22 	SKIP_IF(!ebb_is_supported());
23 
24 	event_init_named(&event, 0x1001e, "cycles");
25 	event_leader_ebb_init(&event);
26 
27 	event.attr.exclude_kernel = 1;
28 	event.attr.exclude_hv = 1;
29 	event.attr.exclude_idle = 1;
30 
31 	FAIL_IF(event_open(&event));
32 	FAIL_IF(ebb_event_enable(&event));
33 
34 	val = mfspr(SPRN_EBBHR);
35 	FAIL_IF(val != 0);
36 
37 	/* Make sure it overflows quickly */
38 	sample_period = 1000;
39 	mtspr(SPRN_PMC1, pmc_sample_period(sample_period));
40 
41 	/* Spin to make sure the event has time to overflow */
42 	for (i = 0; i < 1000; i++)
43 		mb();
44 
45 	dump_ebb_state();
46 
47 	/* We expect to see the PMU frozen & PMAO set */
48 	val = mfspr(SPRN_MMCR0);
49 	FAIL_IF(val != 0x0000000080000080);
50 
51 	event_close(&event);
52 
53 	/* The real test is that we never took an EBB at 0x0 */
54 
55 	return 0;
56 }
57 
main(void)58 int main(void)
59 {
60 	return test_harness(no_handler_test,"no_handler_test");
61 }
62