selftests/powerpc/pmu: Add selftest for PERF_TYPE_HARDWARE events valid check

Testcase to ensure that using invalid event in generic event for
PERF_TYPE_HARDWARE will fail. Invalid generic events in power10 are:
- PERF_COUNT_HW_BUS_CYCLES
- PERF_COUNT_HW_STALLED_CYCLES_FRONTEND
- PERF_COUNT_HW_STALLED_CYCLES_BACKEND
- PERF_COUNT_HW_REF_CPU_CYCLES

Invalid generic events in power9 are:
- PERF_COUNT_HW_BUS_CYCLES
- PERF_COUNT_HW_REF_CPU_CYCLES

Testcase does event open for valid and invalid generic events to ensure
event open works for all valid events and fails for invalid events.
Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220610134113.62991-29-atrajeev@linux.vnet.ibm.com

tools/testing/selftests/powerpc/pmu/event_code_tests/Makefile

@@ -4,7 +4,7 @@ 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 reserved_bits_mmcra_sample_elig_mode_test \
 	group_constraint_mmcra_sample_test invalid_event_code_test reserved_bits_mmcra_thresh_ctl_test \
-	blacklisted_events_test event_alternatives_tests_p9 event_alternatives_tests_p10
+	blacklisted_events_test event_alternatives_tests_p9 event_alternatives_tests_p10 generic_events_valid_test
 
 top_srcdir = ../../../../../..
 include ../../../lib.mk

tools/testing/selftests/powerpc/pmu/event_code_tests/generic_events_valid_test.c

+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2022, Athira Rajeev, IBM Corp.
+ */
+
+#include <stdio.h>
+#include <sys/prctl.h>
+#include <limits.h>
+#include "../event.h"
+#include "../sampling_tests/misc.h"
+
+/*
+ * Testcase to ensure that using invalid event in generic
+ * event for PERF_TYPE_HARDWARE should fail
+ */
+
+static int generic_events_valid_test(void)
+{
+	struct event event;
+
+	/* Check for platform support for the test */
+	SKIP_IF(platform_check_for_tests());
+
+	/* generic events is different in compat_mode */
+	SKIP_IF(check_for_generic_compat_pmu());
+
+	/*
+	 * Invalid generic events in power10:
+	 * - PERF_COUNT_HW_BUS_CYCLES
+	 * - PERF_COUNT_HW_STALLED_CYCLES_FRONTEND
+	 * - PERF_COUNT_HW_STALLED_CYCLES_BACKEND
+	 * - PERF_COUNT_HW_REF_CPU_CYCLES
+	 */
+	if (PVR_VER(mfspr(SPRN_PVR)) == POWER10) {
+		event_init_opts(&event, PERF_COUNT_HW_CPU_CYCLES, PERF_TYPE_HARDWARE, "event");
+		FAIL_IF(event_open(&event));
+		event_close(&event);
+
+		event_init_opts(&event, PERF_COUNT_HW_INSTRUCTIONS,
+				PERF_TYPE_HARDWARE, "event");
+		FAIL_IF(event_open(&event));
+		event_close(&event);
+
+		event_init_opts(&event, PERF_COUNT_HW_CACHE_REFERENCES,
+				PERF_TYPE_HARDWARE, "event");
+		FAIL_IF(event_open(&event));
+		event_close(&event);
+
+		event_init_opts(&event, PERF_COUNT_HW_CACHE_MISSES, PERF_TYPE_HARDWARE, "event");
+		FAIL_IF(event_open(&event));
+		event_close(&event);
+
+		event_init_opts(&event, PERF_COUNT_HW_BRANCH_INSTRUCTIONS,
+				PERF_TYPE_HARDWARE, "event");
+		FAIL_IF(event_open(&event));
+		event_close(&event);
+
+		event_init_opts(&event, PERF_COUNT_HW_BRANCH_MISSES, PERF_TYPE_HARDWARE, "event");
+		FAIL_IF(event_open(&event));
+		event_close(&event);
+
+		event_init_opts(&event, PERF_COUNT_HW_BUS_CYCLES, PERF_TYPE_HARDWARE, "event");
+		FAIL_IF(!event_open(&event));
+
+		event_init_opts(&event, PERF_COUNT_HW_STALLED_CYCLES_FRONTEND,
+				PERF_TYPE_HARDWARE, "event");
+		FAIL_IF(!event_open(&event));
+
+		event_init_opts(&event, PERF_COUNT_HW_STALLED_CYCLES_BACKEND,
+				PERF_TYPE_HARDWARE, "event");
+		FAIL_IF(!event_open(&event));
+
+		event_init_opts(&event, PERF_COUNT_HW_REF_CPU_CYCLES, PERF_TYPE_HARDWARE, "event");
+		FAIL_IF(!event_open(&event));
+	} else if (PVR_VER(mfspr(SPRN_PVR)) == POWER9) {
+		/*
+		 * Invalid generic events in power9:
+		 * - PERF_COUNT_HW_BUS_CYCLES
+		 * - PERF_COUNT_HW_REF_CPU_CYCLES
+		 */
+		event_init_opts(&event, PERF_COUNT_HW_CPU_CYCLES, PERF_TYPE_HARDWARE, "event");
+		FAIL_IF(event_open(&event));
+		event_close(&event);
+
+		event_init_opts(&event, PERF_COUNT_HW_INSTRUCTIONS, PERF_TYPE_HARDWARE, "event");
+		FAIL_IF(event_open(&event));
+		event_close(&event);
+
+		event_init_opts(&event, PERF_COUNT_HW_CACHE_REFERENCES,
+				PERF_TYPE_HARDWARE, "event");
+		FAIL_IF(event_open(&event));
+		event_close(&event);
+
+		event_init_opts(&event, PERF_COUNT_HW_CACHE_MISSES, PERF_TYPE_HARDWARE, "event");
+		FAIL_IF(event_open(&event));
+		event_close(&event);
+
+		event_init_opts(&event, PERF_COUNT_HW_BRANCH_INSTRUCTIONS,
+				PERF_TYPE_HARDWARE, "event");
+		FAIL_IF(event_open(&event));
+		event_close(&event);
+
+		event_init_opts(&event, PERF_COUNT_HW_BRANCH_MISSES, PERF_TYPE_HARDWARE, "event");
+		FAIL_IF(event_open(&event));
+		event_close(&event);
+
+		event_init_opts(&event, PERF_COUNT_HW_BUS_CYCLES, PERF_TYPE_HARDWARE, "event");
+		FAIL_IF(!event_open(&event));
+
+		event_init_opts(&event, PERF_COUNT_HW_STALLED_CYCLES_FRONTEND,
+				PERF_TYPE_HARDWARE, "event");
+		FAIL_IF(event_open(&event));
+		event_close(&event);
+
+		event_init_opts(&event, PERF_COUNT_HW_STALLED_CYCLES_BACKEND,
+				PERF_TYPE_HARDWARE, "event");
+		FAIL_IF(event_open(&event));
+		event_close(&event);
+
+		event_init_opts(&event, PERF_COUNT_HW_REF_CPU_CYCLES, PERF_TYPE_HARDWARE, "event");
+		FAIL_IF(!event_open(&event));
+	}
+
+	return 0;
+}
+
+int main(void)
+{
+	return test_harness(generic_events_valid_test, "generic_events_valid_test");
+}