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/*
15 * Test that closing the EBB event clears MMCR0_PMCC, preventing further access
16 * by userspace to the PMU hardware.
17 */
18
19int close_clears_pmcc(void)
20{
21	struct event event;
22
23	SKIP_IF(!ebb_is_supported());
24
25	event_init_named(&event, 0x1001e, "cycles");
26	event_leader_ebb_init(&event);
27
28	FAIL_IF(event_open(&event));
29
30	ebb_enable_pmc_counting(1);
31	setup_ebb_handler(standard_ebb_callee);
32	ebb_global_enable();
33	FAIL_IF(ebb_event_enable(&event));
34
35	mtspr(SPRN_PMC1, pmc_sample_period(sample_period));
36
37	while (ebb_state.stats.ebb_count < 1)
38		FAIL_IF(core_busy_loop());
39
40	ebb_global_disable();
41	event_close(&event);
42
43	FAIL_IF(ebb_state.stats.ebb_count == 0);
44
45	/* The real test is here, do we take a SIGILL when writing PMU regs now
46	 * that we have closed the event. We expect that we will. */
47
48	FAIL_IF(catch_sigill(write_pmc1));
49
50	/* We should still be able to read EBB regs though */
51	mfspr(SPRN_EBBHR);
52	mfspr(SPRN_EBBRR);
53	mfspr(SPRN_BESCR);
54
55	return 0;
56}
57
58int main(void)
59{
60	return test_harness(close_clears_pmcc, "close_clears_pmcc");
61}
62