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 <stdbool.h>
9
10 #include "ebb.h"
11
12
13 /*
14 * Test of counting cycles while manipulating the user accessible bits in MMCR2.
15 */
16
17 /* We use two values because the first freezes PMC1 and so we would get no EBBs */
18 #define MMCR2_EXPECTED_1 0x4020100804020000UL /* (FC1P|FC2P|FC3P|FC4P|FC5P|FC6P) */
19 #define MMCR2_EXPECTED_2 0x0020100804020000UL /* ( FC2P|FC3P|FC4P|FC5P|FC6P) */
20
21
cycles_with_mmcr2(void)22 int cycles_with_mmcr2(void)
23 {
24 struct event event;
25 uint64_t val, expected[2], actual;
26 int i;
27 bool bad_mmcr2;
28
29 SKIP_IF(!ebb_is_supported());
30
31 event_init_named(&event, 0x1001e, "cycles");
32 event_leader_ebb_init(&event);
33
34 event.attr.exclude_kernel = 1;
35 event.attr.exclude_hv = 1;
36 event.attr.exclude_idle = 1;
37
38 FAIL_IF(event_open(&event));
39
40 ebb_enable_pmc_counting(1);
41 setup_ebb_handler(standard_ebb_callee);
42 ebb_global_enable();
43
44 FAIL_IF(ebb_event_enable(&event));
45
46 mtspr(SPRN_PMC1, pmc_sample_period(sample_period));
47
48 /* XXX Set of MMCR2 must be after enable */
49 expected[0] = MMCR2_EXPECTED_1;
50 expected[1] = MMCR2_EXPECTED_2;
51 i = 0;
52 bad_mmcr2 = false;
53
54 /* Make sure we loop until we take at least one EBB */
55 while ((ebb_state.stats.ebb_count < 20 && !bad_mmcr2) ||
56 ebb_state.stats.ebb_count < 1)
57 {
58 mtspr(SPRN_MMCR2, expected[i % 2]);
59
60 FAIL_IF(core_busy_loop());
61
62 val = mfspr(SPRN_MMCR2);
63 if (val != expected[i % 2]) {
64 bad_mmcr2 = true;
65 actual = val;
66 }
67
68 i++;
69 }
70
71 ebb_global_disable();
72 ebb_freeze_pmcs();
73
74 count_pmc(1, sample_period);
75
76 dump_ebb_state();
77
78 event_close(&event);
79
80 FAIL_IF(ebb_state.stats.ebb_count == 0);
81
82 if (bad_mmcr2)
83 printf("Bad MMCR2 value seen is 0x%lx\n", actual);
84
85 FAIL_IF(bad_mmcr2);
86
87 return 0;
88 }
89
main(void)90 int main(void)
91 {
92 return test_harness(cycles_with_mmcr2, "cycles_with_mmcr2");
93 }
94
