94 lines
1.6 KiB
C
94 lines
1.6 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2014, Michael Ellerman, IBM Corp.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "ebb.h"
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/*
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* Test that PMC5 & 6 are frozen (ie. don't overflow) when they are not being
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* used. Tests the MMCR0_FC56 logic in the kernel.
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*/
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static int pmc56_overflowed;
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static void ebb_callee(void)
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{
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uint64_t val;
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val = mfspr(SPRN_BESCR);
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if (!(val & BESCR_PMEO)) {
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ebb_state.stats.spurious++;
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goto out;
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}
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ebb_state.stats.ebb_count++;
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count_pmc(2, sample_period);
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val = mfspr(SPRN_PMC5);
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if (val >= COUNTER_OVERFLOW)
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pmc56_overflowed++;
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count_pmc(5, COUNTER_OVERFLOW);
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val = mfspr(SPRN_PMC6);
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if (val >= COUNTER_OVERFLOW)
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pmc56_overflowed++;
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count_pmc(6, COUNTER_OVERFLOW);
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out:
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reset_ebb();
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}
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int pmc56_overflow(void)
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{
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struct event event;
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SKIP_IF(!ebb_is_supported());
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/* Use PMC2 so we set PMCjCE, which enables PMC5/6 */
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event_init(&event, 0x2001e);
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event_leader_ebb_init(&event);
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event.attr.exclude_kernel = 1;
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event.attr.exclude_hv = 1;
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event.attr.exclude_idle = 1;
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FAIL_IF(event_open(&event));
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setup_ebb_handler(ebb_callee);
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ebb_global_enable();
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FAIL_IF(ebb_event_enable(&event));
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mtspr(SPRN_PMC2, pmc_sample_period(sample_period));
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mtspr(SPRN_PMC5, 0);
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mtspr(SPRN_PMC6, 0);
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while (ebb_state.stats.ebb_count < 10)
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FAIL_IF(core_busy_loop());
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ebb_global_disable();
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ebb_freeze_pmcs();
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dump_ebb_state();
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printf("PMC5/6 overflow %d\n", pmc56_overflowed);
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event_close(&event);
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FAIL_IF(ebb_state.stats.ebb_count == 0 || pmc56_overflowed != 0);
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return 0;
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}
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int main(void)
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{
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return test_harness(pmc56_overflow, "pmc56_overflow");
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}
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