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authorMichael Ellerman <mpe@ellerman.id.au>2014-07-23 17:31:38 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2014-07-28 14:11:32 +1000
commit985ac68eba4c6487754a67401909239e0505171a (patch)
tree8e174d221b2ab35561a7f098130d03793751ab0d /tools/testing/selftests/powerpc/pmu
parentselftests/powerpc: Dump MMCR2 as part of the EBB HW state (diff)
downloadlinux-dev-985ac68eba4c6487754a67401909239e0505171a.tar.xz
linux-dev-985ac68eba4c6487754a67401909239e0505171a.zip
selftests/powerpc: Add cycles test with MMCR2 handling
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'tools/testing/selftests/powerpc/pmu')
-rw-r--r--tools/testing/selftests/powerpc/pmu/ebb/Makefile3
-rw-r--r--tools/testing/selftests/powerpc/pmu/ebb/cycles_with_mmcr2_test.c91
2 files changed, 93 insertions, 1 deletions
diff --git a/tools/testing/selftests/powerpc/pmu/ebb/Makefile b/tools/testing/selftests/powerpc/pmu/ebb/Makefile
index 251447eafe49..3dc4332698cb 100644
--- a/tools/testing/selftests/powerpc/pmu/ebb/Makefile
+++ b/tools/testing/selftests/powerpc/pmu/ebb/Makefile
@@ -13,7 +13,8 @@ PROGS := reg_access_test event_attributes_test cycles_test \
close_clears_pmcc_test instruction_count_test \
fork_cleanup_test ebb_on_child_test \
ebb_on_willing_child_test back_to_back_ebbs_test \
- lost_exception_test no_handler_test
+ lost_exception_test no_handler_test \
+ cycles_with_mmcr2_test
all: $(PROGS)
diff --git a/tools/testing/selftests/powerpc/pmu/ebb/cycles_with_mmcr2_test.c b/tools/testing/selftests/powerpc/pmu/ebb/cycles_with_mmcr2_test.c
new file mode 100644
index 000000000000..d43029b0800c
--- /dev/null
+++ b/tools/testing/selftests/powerpc/pmu/ebb/cycles_with_mmcr2_test.c
@@ -0,0 +1,91 @@
+/*
+ * Copyright 2014, Michael Ellerman, IBM Corp.
+ * Licensed under GPLv2.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+
+#include "ebb.h"
+
+
+/*
+ * Test of counting cycles while manipulating the user accessible bits in MMCR2.
+ */
+
+/* We use two values because the first freezes PMC1 and so we would get no EBBs */
+#define MMCR2_EXPECTED_1 0x4020100804020000UL /* (FC1P|FC2P|FC3P|FC4P|FC5P|FC6P) */
+#define MMCR2_EXPECTED_2 0x0020100804020000UL /* ( FC2P|FC3P|FC4P|FC5P|FC6P) */
+
+
+int cycles_with_mmcr2(void)
+{
+ struct event event;
+ uint64_t val, expected[2], actual;
+ int i;
+ bool bad_mmcr2;
+
+ 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));
+
+ /* XXX Set of MMCR2 must be after enable */
+ expected[0] = MMCR2_EXPECTED_1;
+ expected[1] = MMCR2_EXPECTED_2;
+ i = 0;
+ bad_mmcr2 = false;
+
+ /* Make sure we loop until we take at least one EBB */
+ while ((ebb_state.stats.ebb_count < 20 && !bad_mmcr2) ||
+ ebb_state.stats.ebb_count < 1)
+ {
+ mtspr(SPRN_MMCR2, expected[i % 2]);
+
+ FAIL_IF(core_busy_loop());
+
+ val = mfspr(SPRN_MMCR2);
+ if (val != expected[i % 2]) {
+ bad_mmcr2 = true;
+ actual = val;
+ }
+
+ i++;
+ }
+
+ ebb_global_disable();
+ ebb_freeze_pmcs();
+
+ count_pmc(1, sample_period);
+
+ dump_ebb_state();
+
+ event_close(&event);
+
+ FAIL_IF(ebb_state.stats.ebb_count == 0);
+
+ if (bad_mmcr2)
+ printf("Bad MMCR2 value seen is 0x%lx\n", actual);
+
+ FAIL_IF(bad_mmcr2);
+
+ return 0;
+}
+
+int main(void)
+{
+ return test_harness(cycles_with_mmcr2, "cycles_with_mmcr2");
+}