3337bf41e0
An extra count on ebb_state.stats.pmc_count[PMC_INDEX(pmc)] is being per- formed when count_pmc() is used to reset PMCs on a few selftests. This extra pmc_count can occasionally invalidate results, such as the ones from cycles_test shown hereafter. The ebb_check_count() failed with an above the upper limit error due to the extra value on ebb_state.stats.pmc_count. Furthermore, this extra count is also indicated by extra PMC1 trace_log on the output of the cycle test (as well as on pmc56_overflow_test): ========== ... [21]: counter = 8 [22]: register SPRN_MMCR0 = 0x0000000080000080 [23]: register SPRN_PMC1 = 0x0000000080000004 [24]: counter = 9 [25]: register SPRN_MMCR0 = 0x0000000080000080 [26]: register SPRN_PMC1 = 0x0000000080000004 [27]: counter = 10 [28]: register SPRN_MMCR0 = 0x0000000080000080 [29]: register SPRN_PMC1 = 0x0000000080000004 >> [30]: register SPRN_PMC1 = 0x000000004000051e PMC1 count (0x280000546) above upper limit 0x2800003e8 (+0x15e) [FAIL] Test FAILED on line 52 failure: cycles ========== Signed-off-by: Desnes A. Nunes do Rosario <desnesn@linux.ibm.com> Tested-by: Sachin Sant <sachinp@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200626164737.21943-1-desnesn@linux.ibm.com
87 lines
2.0 KiB
C
87 lines
2.0 KiB
C
// 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 <sys/ioctl.h>
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#include "ebb.h"
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/*
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* Test counting multiple events using EBBs.
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*/
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int multi_counter(void)
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{
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struct event events[6];
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int i, group_fd;
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SKIP_IF(!ebb_is_supported());
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event_init_named(&events[0], 0x1001C, "PM_CMPLU_STALL_THRD");
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event_init_named(&events[1], 0x2D016, "PM_CMPLU_STALL_FXU");
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event_init_named(&events[2], 0x30006, "PM_CMPLU_STALL_OTHER_CMPL");
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event_init_named(&events[3], 0x4000A, "PM_CMPLU_STALL");
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event_init_named(&events[4], 0x600f4, "PM_RUN_CYC");
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event_init_named(&events[5], 0x500fa, "PM_RUN_INST_CMPL");
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event_leader_ebb_init(&events[0]);
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for (i = 1; i < 6; i++)
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event_ebb_init(&events[i]);
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group_fd = -1;
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for (i = 0; i < 6; i++) {
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events[i].attr.exclude_kernel = 1;
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events[i].attr.exclude_hv = 1;
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events[i].attr.exclude_idle = 1;
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FAIL_IF(event_open_with_group(&events[i], group_fd));
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if (group_fd == -1)
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group_fd = events[0].fd;
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}
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ebb_enable_pmc_counting(1);
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ebb_enable_pmc_counting(2);
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ebb_enable_pmc_counting(3);
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ebb_enable_pmc_counting(4);
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ebb_enable_pmc_counting(5);
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ebb_enable_pmc_counting(6);
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setup_ebb_handler(standard_ebb_callee);
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FAIL_IF(ioctl(events[0].fd, PERF_EVENT_IOC_ENABLE, PERF_IOC_FLAG_GROUP));
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FAIL_IF(event_read(&events[0]));
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ebb_global_enable();
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mtspr(SPRN_PMC1, pmc_sample_period(sample_period));
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mtspr(SPRN_PMC2, pmc_sample_period(sample_period));
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mtspr(SPRN_PMC3, pmc_sample_period(sample_period));
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mtspr(SPRN_PMC4, pmc_sample_period(sample_period));
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mtspr(SPRN_PMC5, pmc_sample_period(sample_period));
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mtspr(SPRN_PMC6, pmc_sample_period(sample_period));
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while (ebb_state.stats.ebb_count < 50) {
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FAIL_IF(core_busy_loop());
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FAIL_IF(ebb_check_mmcr0());
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}
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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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for (i = 0; i < 6; i++)
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event_close(&events[i]);
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FAIL_IF(ebb_state.stats.ebb_count == 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(multi_counter, "multi_counter");
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}
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