Add the rt linux 4.1.3-rt3 as base

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

diff --git a/kernel/tools/testing/selftests/powerpc/pmu/ebb/back_to_back_ebbs_test.c b/kernel/tools/testing/selftests/powerpc/pmu/ebb/back_to_back_ebbs_test.c
new file mode 100644 (file)
index 0000000..66ea765
--- /dev/null
+++ b/kernel/tools/testing/selftests/powerpc/pmu/ebb/back_to_back_ebbs_test.c
@@ -0,0 +1,106 @@
+/*
+ * Copyright 2014, Michael Ellerman, IBM Corp.
+ * Licensed under GPLv2.
+ */
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "ebb.h"
+
+
+#define NUMBER_OF_EBBS 50
+
+/*
+ * Test that if we overflow the counter while in the EBB handler, we take
+ * another EBB on exiting from the handler.
+ *
+ * We do this by counting with a stupidly low sample period, causing us to
+ * overflow the PMU while we're still in the EBB handler, leading to another
+ * EBB.
+ *
+ * We get out of what would otherwise be an infinite loop by leaving the
+ * counter frozen once we've taken enough EBBs.
+ */
+
+static void ebb_callee(void)
+{
+       uint64_t siar, val;
+
+       val = mfspr(SPRN_BESCR);
+       if (!(val & BESCR_PMEO)) {
+               ebb_state.stats.spurious++;
+               goto out;
+       }
+
+       ebb_state.stats.ebb_count++;
+       trace_log_counter(ebb_state.trace, ebb_state.stats.ebb_count);
+
+       /* Resets the PMC */
+       count_pmc(1, sample_period);
+
+out:
+       if (ebb_state.stats.ebb_count == NUMBER_OF_EBBS)
+               /* Reset but leave counters frozen */
+               reset_ebb_with_clear_mask(MMCR0_PMAO);
+       else
+               /* Unfreezes */
+               reset_ebb();
+
+       /* Do some stuff to chew some cycles and pop the counter */
+       siar = mfspr(SPRN_SIAR);
+       trace_log_reg(ebb_state.trace, SPRN_SIAR, siar);
+
+       val = mfspr(SPRN_PMC1);
+       trace_log_reg(ebb_state.trace, SPRN_PMC1, val);
+
+       val = mfspr(SPRN_MMCR0);
+       trace_log_reg(ebb_state.trace, SPRN_MMCR0, val);
+}
+
+int back_to_back_ebbs(void)
+{
+       struct event event;
+
+       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));
+
+       setup_ebb_handler(ebb_callee);
+
+       FAIL_IF(ebb_event_enable(&event));
+
+       sample_period = 5;
+
+       ebb_freeze_pmcs();
+       mtspr(SPRN_PMC1, pmc_sample_period(sample_period));
+       ebb_global_enable();
+       ebb_unfreeze_pmcs();
+
+       while (ebb_state.stats.ebb_count < NUMBER_OF_EBBS)
+               FAIL_IF(core_busy_loop());
+
+       ebb_global_disable();
+       ebb_freeze_pmcs();
+
+       count_pmc(1, sample_period);
+
+       dump_ebb_state();
+
+       event_close(&event);
+
+       FAIL_IF(ebb_state.stats.ebb_count != NUMBER_OF_EBBS);
+
+       return 0;
+}
+
+int main(void)
+{
+       return test_harness(back_to_back_ebbs, "back_to_back_ebbs");
+}