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authorMichael Ellerman <mpe@ellerman.id.au>2014-07-23 17:31:40 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2014-07-28 14:11:33 +1000
commitf929a4641b93c0a45f188022bb9675214b3070d6 (patch)
tree26696fca496506ab5d7c6aac12bc5d13b35260ab /tools
parentbd8bbd87f1e4226f576ddbc71d42541418d8f2d3 (diff)
downloadlinux-f929a4641b93c0a45f188022bb9675214b3070d6.tar.bz2
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>
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/powerpc/pmu/Makefile2
-rw-r--r--tools/testing/selftests/powerpc/pmu/per_event_excludes.c114
2 files changed, 115 insertions, 1 deletions
diff --git a/tools/testing/selftests/powerpc/pmu/Makefile b/tools/testing/selftests/powerpc/pmu/Makefile
index 8595cfd7e41b..c9f4263906a5 100644
--- a/tools/testing/selftests/powerpc/pmu/Makefile
+++ b/tools/testing/selftests/powerpc/pmu/Makefile
@@ -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
diff --git a/tools/testing/selftests/powerpc/pmu/per_event_excludes.c b/tools/testing/selftests/powerpc/pmu/per_event_excludes.c
new file mode 100644
index 000000000000..fddbbc9cae2f
--- /dev/null
+++ b/tools/testing/selftests/powerpc/pmu/per_event_excludes.c
@@ -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");
+}