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-rw-r--r--tools/testing/selftests/powerpc/pmu/ebb/regs_access_pmccext_test.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/pmu/ebb/regs_access_pmccext_test.c b/tools/testing/selftests/powerpc/pmu/ebb/regs_access_pmccext_test.c
new file mode 100644
index 000000000000..1eda8e9932e8
--- /dev/null
+++ b/tools/testing/selftests/powerpc/pmu/ebb/regs_access_pmccext_test.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2021, Athira Rajeev, IBM Corp.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <setjmp.h>
+#include <signal.h>
+
+#include "ebb.h"
+
+
+/*
+ * Test that closing the EBB event clears MMCR0_PMCC and
+ * sets MMCR0_PMCCEXT preventing further read access to the
+ * group B PMU registers.
+ */
+
+static int regs_access_pmccext(void)
+{
+ struct event event;
+
+ SKIP_IF(!ebb_is_supported());
+
+ 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);
+
+ /*
+ * For ISA v3.1, verify the test takes a SIGILL when reading
+ * PMU regs after the event is closed. With the control bit
+ * in MMCR0 (PMCCEXT) restricting access to group B PMU regs,
+ * sigill is expected.
+ */
+ if (have_hwcap2(PPC_FEATURE2_ARCH_3_1))
+ FAIL_IF(catch_sigill(dump_ebb_state));
+ else
+ dump_ebb_state();
+
+ return 0;
+}
+
+int main(void)
+{
+ return test_harness(regs_access_pmccext, "regs_access_pmccext");
+}