1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright 2021, Athira Rajeev, 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 and
16  * sets MMCR0_PMCCEXT preventing further read access to the
17  * group B PMU registers.
18  */
19 
regs_access_pmccext(void)20 static int regs_access_pmccext(void)
21 {
22 	struct event event;
23 
24 	SKIP_IF(!ebb_is_supported());
25 
26 	event_init_named(&event, 0x1001e, "cycles");
27 	event_leader_ebb_init(&event);
28 
29 	FAIL_IF(event_open(&event));
30 
31 	ebb_enable_pmc_counting(1);
32 	setup_ebb_handler(standard_ebb_callee);
33 	ebb_global_enable();
34 	FAIL_IF(ebb_event_enable(&event));
35 
36 	mtspr(SPRN_PMC1, pmc_sample_period(sample_period));
37 
38 	while (ebb_state.stats.ebb_count < 1)
39 		FAIL_IF(core_busy_loop());
40 
41 	ebb_global_disable();
42 	event_close(&event);
43 
44 	FAIL_IF(ebb_state.stats.ebb_count == 0);
45 
46 	/*
47 	 * For ISA v3.1, verify the test takes a SIGILL when reading
48 	 * PMU regs after the event is closed. With the control bit
49 	 * in MMCR0 (PMCCEXT) restricting access to group B PMU regs,
50 	 * sigill is expected.
51 	 */
52 	if (have_hwcap2(PPC_FEATURE2_ARCH_3_1))
53 		FAIL_IF(catch_sigill(dump_ebb_state));
54 	else
55 		dump_ebb_state();
56 
57 	return 0;
58 }
59 
main(void)60 int main(void)
61 {
62 	return test_harness(regs_access_pmccext, "regs_access_pmccext");
63 }
64