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-rw-r--r--tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr3_src_test.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr3_src_test.c b/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr3_src_test.c
new file mode 100644
index 000000000000..e154e2a4cc3a
--- /dev/null
+++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr3_src_test.c
@@ -0,0 +1,67 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2022, Kajol Jain, IBM Corp.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "../event.h"
+#include "misc.h"
+#include "utils.h"
+
+extern void thirty_two_instruction_loop_with_ll_sc(u64 loops, u64 *ll_sc_target);
+
+/* The data cache was reloaded from local core's L3 due to a demand load */
+#define EventCode 0x1340000001c040
+
+/*
+ * A perf sampling test for mmcr3
+ * fields.
+ */
+static int mmcr3_src(void)
+{
+ struct event event;
+ u64 *intr_regs;
+ u64 dummy;
+
+ /* Check for platform support for the test */
+ SKIP_IF(check_pvr_for_sampling_tests());
+ SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_3_1));
+
+ /* Init the event for the sampling test */
+ event_init_sampling(&event, EventCode);
+ event.attr.sample_regs_intr = platform_extended_mask;
+ FAIL_IF(event_open(&event));
+ event.mmap_buffer = event_sample_buf_mmap(event.fd, 1);
+
+ FAIL_IF(event_enable(&event));
+
+ /* workload to make event overflow */
+ thirty_two_instruction_loop_with_ll_sc(1000000, &dummy);
+
+ FAIL_IF(event_disable(&event));
+
+ /* Check for sample count */
+ FAIL_IF(!collect_samples(event.mmap_buffer));
+
+ intr_regs = get_intr_regs(&event, event.mmap_buffer);
+
+ /* Check for intr_regs */
+ FAIL_IF(!intr_regs);
+
+ /*
+ * Verify that src field of MMCR3 match with
+ * corresponding event code field
+ */
+ FAIL_IF(EV_CODE_EXTRACT(event.attr.config, mmcr3_src) !=
+ get_mmcr3_src(get_reg_value(intr_regs, "MMCR3"), 1));
+
+ event_close(&event);
+ return 0;
+}
+
+int main(void)
+{
+ return test_harness(mmcr3_src, "mmcr3_src");
+}