Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / tools / testing / selftests / powerpc / pmu / ebb / pmc56_overflow_test.c

diff --git a/kernel/tools/testing/selftests/powerpc/pmu/ebb/pmc56_overflow_test.c b/kernel/tools/testing/selftests/powerpc/pmu/ebb/pmc56_overflow_test.c
new file mode 100644 (file)
index 0000000..a503fa7
--- /dev/null
+++ b/kernel/tools/testing/selftests/powerpc/pmu/ebb/pmc56_overflow_test.c
@@ -0,0 +1,93 @@
+/*
+ * Copyright 2014, Michael Ellerman, IBM Corp.
+ * Licensed under GPLv2.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "ebb.h"
+
+
+/*
+ * Test that PMC5 & 6 are frozen (ie. don't overflow) when they are not being
+ * used. Tests the MMCR0_FC56 logic in the kernel.
+ */
+
+static int pmc56_overflowed;
+
+static void ebb_callee(void)
+{
+       uint64_t val;
+
+       val = mfspr(SPRN_BESCR);
+       if (!(val & BESCR_PMEO)) {
+               ebb_state.stats.spurious++;
+               goto out;
+       }
+
+       ebb_state.stats.ebb_count++;
+       count_pmc(2, sample_period);
+
+       val = mfspr(SPRN_PMC5);
+       if (val >= COUNTER_OVERFLOW)
+               pmc56_overflowed++;
+
+       count_pmc(5, COUNTER_OVERFLOW);
+
+       val = mfspr(SPRN_PMC6);
+       if (val >= COUNTER_OVERFLOW)
+               pmc56_overflowed++;
+
+       count_pmc(6, COUNTER_OVERFLOW);
+
+out:
+       reset_ebb();
+}
+
+int pmc56_overflow(void)
+{
+       struct event event;
+
+       /* Use PMC2 so we set PMCjCE, which enables PMC5/6 */
+       event_init(&event, 0x2001e);
+       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));
+
+       setup_ebb_handler(ebb_callee);
+       ebb_global_enable();
+
+       FAIL_IF(ebb_event_enable(&event));
+
+       mtspr(SPRN_PMC1, pmc_sample_period(sample_period));
+       mtspr(SPRN_PMC5, 0);
+       mtspr(SPRN_PMC6, 0);
+
+       while (ebb_state.stats.ebb_count < 10)
+               FAIL_IF(core_busy_loop());
+
+       ebb_global_disable();
+       ebb_freeze_pmcs();
+
+       count_pmc(2, sample_period);
+
+       dump_ebb_state();
+
+       printf("PMC5/6 overflow %d\n", pmc56_overflowed);
+
+       event_close(&event);
+
+       FAIL_IF(ebb_state.stats.ebb_count == 0 || pmc56_overflowed != 0);
+
+       return 0;
+}
+
+int main(void)
+{
+       return test_harness(pmc56_overflow, "pmc56_overflow");
+}