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
59 lines
1.0 KiB
C
59 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright 2014, Michael Ellerman, IBM Corp.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "ebb.h"
|
|
|
|
|
|
/*
|
|
* Basic test that counts user cycles and takes EBBs.
|
|
*/
|
|
int cycles(void)
|
|
{
|
|
struct event event;
|
|
|
|
SKIP_IF(!ebb_is_supported());
|
|
|
|
event_init_named(&event, 0x1001e, "cycles");
|
|
event_leader_ebb_init(&event);
|
|
|
|
event.attr.exclude_kernel = 1;
|
|
event.attr.exclude_hv = 1;
|
|
event.attr.exclude_idle = 1;
|
|
|
|
FAIL_IF(event_open(&event));
|
|
|
|
ebb_enable_pmc_counting(1);
|
|
setup_ebb_handler(standard_ebb_callee);
|
|
ebb_global_enable();
|
|
FAIL_IF(ebb_event_enable(&event));
|
|
|
|
mtspr(SPRN_PMC1, pmc_sample_period(sample_period));
|
|
|
|
while (ebb_state.stats.ebb_count < 10) {
|
|
FAIL_IF(core_busy_loop());
|
|
FAIL_IF(ebb_check_mmcr0());
|
|
}
|
|
|
|
ebb_global_disable();
|
|
ebb_freeze_pmcs();
|
|
|
|
dump_ebb_state();
|
|
|
|
event_close(&event);
|
|
|
|
FAIL_IF(ebb_state.stats.ebb_count == 0);
|
|
FAIL_IF(!ebb_check_count(1, sample_period, 100));
|
|
|
|
return 0;
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
return test_harness(cycles, "cycles");
|
|
}
|