Add the rt linux 4.1.3-rt3 as base

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

diff --git a/kernel/tools/testing/selftests/powerpc/pmu/ebb/close_clears_pmcc_test.c b/kernel/tools/testing/selftests/powerpc/pmu/ebb/close_clears_pmcc_test.c
new file mode 100644 (file)
index 0000000..0f0423d
--- /dev/null
+++ b/kernel/tools/testing/selftests/powerpc/pmu/ebb/close_clears_pmcc_test.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright 2014, Michael Ellerman, IBM Corp.
+ * Licensed under GPLv2.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <setjmp.h>
+#include <signal.h>
+
+#include "ebb.h"
+
+
+/*
+ * Test that closing the EBB event clears MMCR0_PMCC, preventing further access
+ * by userspace to the PMU hardware.
+ */
+
+int close_clears_pmcc(void)
+{
+       struct event event;
+
+       event_init_named(&event, 0x1001e, "cycles");
+       event_leader_ebb_init(&event);
+
+       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));
+
+       while (ebb_state.stats.ebb_count < 1)
+               FAIL_IF(core_busy_loop());
+
+       ebb_global_disable();
+       event_close(&event);
+
+       FAIL_IF(ebb_state.stats.ebb_count == 0);
+
+       /* The real test is here, do we take a SIGILL when writing PMU regs now
+        * that we have closed the event. We expect that we will. */
+
+       FAIL_IF(catch_sigill(write_pmc1));
+
+       /* We should still be able to read EBB regs though */
+       mfspr(SPRN_EBBHR);
+       mfspr(SPRN_EBBRR);
+       mfspr(SPRN_BESCR);
+
+       return 0;
+}
+
+int main(void)
+{
+       return test_harness(close_clears_pmcc, "close_clears_pmcc");
+}