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selftests/powerpc: Add test of per-event excludes 

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Ellerman 2014-07-23 17:31:40 +10:00 committed by Benjamin Herrenschmidt
parent bd8bbd87f1
commit f929a4641b
2 changed files with 115 additions and 1 deletions
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2
tools/testing/selftests/powerpc/pmu/Makefile
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@ -1,7 +1,7 @@
noarg:
$(MAKE) -C ../
PROGS := count_instructions l3_bank_test
PROGS := count_instructions l3_bank_test per_event_excludes
EXTRA_SOURCES := ../harness.c event.c lib.c
SUB_TARGETS = ebb

114
tools/testing/selftests/powerpc/pmu/per_event_excludes.c Normal file
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@ -0,0 +1,114 @@
/*
* Copyright 2014, Michael Ellerman, IBM Corp.
* Licensed under GPLv2.
*/
#define _GNU_SOURCE
#include <elf.h>
#include <limits.h>
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <sys/prctl.h>
#include "event.h"
#include "lib.h"
#include "utils.h"
/*
* Test that per-event excludes work.
*/
static int per_event_excludes(void)
{
struct event *e, events[4];
char *platform;
int i;
platform = (char *)get_auxv_entry(AT_BASE_PLATFORM);
FAIL_IF(!platform);
SKIP_IF(strcmp(platform, "power8") != 0);
/*
* We need to create the events disabled, otherwise the running/enabled
* counts don't match up.
*/
e = &events[0];
event_init_opts(e, PERF_COUNT_HW_INSTRUCTIONS,
PERF_TYPE_HARDWARE, "instructions");
e->attr.disabled = 1;
e = &events[1];
event_init_opts(e, PERF_COUNT_HW_INSTRUCTIONS,
PERF_TYPE_HARDWARE, "instructions(k)");
e->attr.disabled = 1;
e->attr.exclude_user = 1;
e->attr.exclude_hv = 1;
e = &events[2];
event_init_opts(e, PERF_COUNT_HW_INSTRUCTIONS,
PERF_TYPE_HARDWARE, "instructions(h)");
e->attr.disabled = 1;
e->attr.exclude_user = 1;
e->attr.exclude_kernel = 1;
e = &events[3];
event_init_opts(e, PERF_COUNT_HW_INSTRUCTIONS,
PERF_TYPE_HARDWARE, "instructions(u)");
e->attr.disabled = 1;
e->attr.exclude_hv = 1;
e->attr.exclude_kernel = 1;
FAIL_IF(event_open(&events[0]));
/*
* The open here will fail if we don't have per event exclude support,
* because the second event has an incompatible set of exclude settings
* and we're asking for the events to be in a group.
*/
for (i = 1; i < 4; i++)
FAIL_IF(event_open_with_group(&events[i], events[0].fd));
/*
* Even though the above will fail without per-event excludes we keep
* testing in order to be thorough.
*/
prctl(PR_TASK_PERF_EVENTS_ENABLE);
/* Spin for a while */
for (i = 0; i < INT_MAX; i++)
asm volatile("" : : : "memory");
prctl(PR_TASK_PERF_EVENTS_DISABLE);
for (i = 0; i < 4; i++) {
FAIL_IF(event_read(&events[i]));
event_report(&events[i]);
}
/*
* We should see that all events have enabled == running. That
* shows that they were all on the PMU at once.
*/
for (i = 0; i < 4; i++)
FAIL_IF(events[i].result.running != events[i].result.enabled);
/*
* We can also check that the result for instructions is >= all the
* other counts. That's because it is counting all instructions while
* the others are counting a subset.
*/
for (i = 1; i < 4; i++)
FAIL_IF(events[0].result.value < events[i].result.value);
for (i = 0; i < 4; i++)
event_close(&events[i]);
return 0;
}
int main(void)
{
return test_harness(per_event_excludes, "per_event_excludes");
}