[PATCH V2 21/35] selftest/powerpc/pmu: Add selftest for group constraint for MMCRA Sampling Mode field

[Athira Rajeev]

Testcase for reserved bits in Monitor Mode Control
Register A (MMCRA) Random Sampling Mode (SM) value.
As per Instruction Set Architecture (ISA), the values
0x5, 0x9, 0xD, 0x19, 0x1D, 0x1A, 0x1E are reserved
for sampling mode field. Test that having these reserved
bit values should cause event_open to fail. Input event
code in testcases uses these sampling bits along with
401e0 (PM_MRK_INST_CMPL).

Signed-off-by: Athira Rajeev <atrajeev at linux.vnet.ibm.com>
---
 .../powerpc/pmu/event_code_tests/Makefile     |  2 +-
 ...eserved_bits_mmcra_sample_elig_mode_test.c | 77 +++++++++++++++++++
 2 files changed, 78 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/powerpc/pmu/event_code_tests/reserved_bits_mmcra_sample_elig_mode_test.c

diff --git a/tools/testing/selftests/powerpc/pmu/event_code_tests/Makefile b/tools/testing/selftests/powerpc/pmu/event_code_tests/Makefile
index 5b61fb0b9fd6..5dd482843572 100644
--- a/tools/testing/selftests/powerpc/pmu/event_code_tests/Makefile
+++ b/tools/testing/selftests/powerpc/pmu/event_code_tests/Makefile
@@ -2,7 +2,7 @@
 CFLAGS += -m64
 
 TEST_GEN_PROGS := group_constraint_pmc56_test group_pmc56_exclude_constraints_test group_constraint_pmc_count_test \
-	group_constraint_repeat_test group_constraint_radix_scope_qual_test
+	group_constraint_repeat_test group_constraint_radix_scope_qual_test reserved_bits_mmcra_sample_elig_mode_test
 
 top_srcdir = ../../../../../..
 include ../../../lib.mk
diff --git a/tools/testing/selftests/powerpc/pmu/event_code_tests/reserved_bits_mmcra_sample_elig_mode_test.c b/tools/testing/selftests/powerpc/pmu/event_code_tests/reserved_bits_mmcra_sample_elig_mode_test.c
new file mode 100644
index 000000000000..4c119c821b99
--- /dev/null
+++ b/tools/testing/selftests/powerpc/pmu/event_code_tests/reserved_bits_mmcra_sample_elig_mode_test.c
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2022, Athira Rajeev, IBM Corp.
+ */
+
+#include <stdio.h>
+#include "../event.h"
+#include "../sampling_tests/misc.h"
+
+/*
+ * Testcase for reserved bits in Monitor Mode Control
+ * Register A (MMCRA) Random Sampling Mode (SM) value.
+ * As per Instruction Set Architecture (ISA), the values
+ * 0x5, 0x9, 0xD, 0x19, 0x1D, 0x1A, 0x1E are reserved
+ * for sampling mode field. Test that having these reserved
+ * bit values should cause event_open to fail.
+ * Input event code uses these sampling bits along with
+ * 401e0 (PM_MRK_INST_CMPL).
+ */
+
+static int reserved_bits_mmcra_sample_elig_mode(void)
+{
+	struct event event;
+
+	/* Check for platform support for the test */
+	SKIP_IF(platform_check_for_tests());
+
+	/* Skip for Generic compat PMU */
+	SKIP_IF(check_for_generic_compat_pmu());
+
+	/*
+	 * MMCRA Random Sampling Mode (SM) values: 0x5
+	 * 0x9, 0xD, 0x19, 0x1D, 0x1A, 0x1E is reserved.
+	 * Expected to fail when using these reserved values.
+	 */
+	event_init(&event, 0x50401e0);
+	FAIL_IF(!event_open(&event));
+
+	event_init(&event, 0x90401e0);
+	FAIL_IF(!event_open(&event));
+
+	event_init(&event, 0xD0401e0);
+	FAIL_IF(!event_open(&event));
+
+	event_init(&event, 0x190401e0);
+	FAIL_IF(!event_open(&event));
+
+	event_init(&event, 0x1D0401e0);
+	FAIL_IF(!event_open(&event));
+
+	event_init(&event, 0x1A0401e0);
+	FAIL_IF(!event_open(&event));
+
+	event_init(&event, 0x1E0401e0);
+	FAIL_IF(!event_open(&event));
+
+	/*
+	 * MMCRA Random Sampling Mode (SM) value 0x10
+	 * is reserved in power10 and 0xC is reserved in
+	 * power9.
+	 */
+	if (PVR_VER(mfspr(SPRN_PVR)) == POWER10) {
+		event_init(&event, 0x100401e0);
+		FAIL_IF(!event_open(&event));
+	} else if (PVR_VER(mfspr(SPRN_PVR)) == POWER9) {
+		event_init(&event, 0xC0401e0);
+		FAIL_IF(!event_open(&event));
+	}
+
+	return 0;
+}
+
+int main(void)
+{
+	return test_harness(reserved_bits_mmcra_sample_elig_mode,
+			    "reserved_bits_mmcra_sample_elig_mode");
+}
-- 
2.35.1