2 * Copyright 2014, Michael Ellerman, IBM Corp.
3 * Licensed under GPLv2.
13 * Test that PMC5 & 6 are frozen (ie. don't overflow) when they are not being
14 * used. Tests the MMCR0_FC56 logic in the kernel.
17 static int pmc56_overflowed
;
19 static void ebb_callee(void)
23 val
= mfspr(SPRN_BESCR
);
24 if (!(val
& BESCR_PMEO
)) {
25 ebb_state
.stats
.spurious
++;
29 ebb_state
.stats
.ebb_count
++;
30 count_pmc(2, sample_period
);
32 val
= mfspr(SPRN_PMC5
);
33 if (val
>= COUNTER_OVERFLOW
)
36 count_pmc(5, COUNTER_OVERFLOW
);
38 val
= mfspr(SPRN_PMC6
);
39 if (val
>= COUNTER_OVERFLOW
)
42 count_pmc(6, COUNTER_OVERFLOW
);
48 int pmc56_overflow(void)
52 SKIP_IF(!ebb_is_supported());
54 /* Use PMC2 so we set PMCjCE, which enables PMC5/6 */
55 event_init(&event
, 0x2001e);
56 event_leader_ebb_init(&event
);
58 event
.attr
.exclude_kernel
= 1;
59 event
.attr
.exclude_hv
= 1;
60 event
.attr
.exclude_idle
= 1;
62 FAIL_IF(event_open(&event
));
64 setup_ebb_handler(ebb_callee
);
67 FAIL_IF(ebb_event_enable(&event
));
69 mtspr(SPRN_PMC1
, pmc_sample_period(sample_period
));
73 while (ebb_state
.stats
.ebb_count
< 10)
74 FAIL_IF(core_busy_loop());
79 count_pmc(2, sample_period
);
83 printf("PMC5/6 overflow %d\n", pmc56_overflowed
);
87 FAIL_IF(ebb_state
.stats
.ebb_count
== 0 || pmc56_overflowed
!= 0);
94 return test_harness(pmc56_overflow
, "pmc56_overflow");
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