From: Athira Rajeev <atraj...@linux.vnet.ibm.com>
The testcase uses "instructions" event to verify two
bits(PMAE and PMAO) in Monitor Mode Control Register 0
(MMCR0). At the time of interrupt, pmae bit ( which enables
performance monitor exception ) is expected to be cleared
and pmao (which indicates performance monitor alert) bit
is expected to be set in MMCR0. And testcases handles
these checks.
Signed-off-by: Athira Rajeev <atraj...@linux.vnet.ibm.com>
---
.../powerpc/pmu/sampling_tests/Makefile | 6 +-
.../sampling_tests/mmcr0_exceptionbits_test.c | 59 +++++++++++++++++++
2 files changed, 63 insertions(+), 2 deletions(-)
create mode 100644
tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr0_exceptionbits_test.c
diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile
b/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile
index eb00c9f931ec..aee25c7037ac 100644
--- a/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile
+++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile
@@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
include ../../../../../../scripts/Kbuild.include
-all: $(TEST_GEN_PROGS)
+all: $(TEST_GEN_PROGS) mmcr0_exceptionbits_test.c
noarg:
$(MAKE) -C ../../
@@ -12,9 +12,11 @@ CFLAGS += -m64 -I../../../../../lib/
no-pie-option := $(call try-run, echo 'int main() { return 0; }' | \
$(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -no-pie -x c - -o
"$$TMP", -no-pie)
+TEST_GEN_PROGS := mmcr0_exceptionbits_test
+
LDFLAGS += $(no-pie-option)
top_srcdir = ../../../../../..
include ../../../lib.mk
-$(TEST_GEN_PROGS): ../../harness.c ../../utils.c ../event.c ../lib.c misc.c
misc.h
+$(TEST_GEN_PROGS): ../../harness.c ../../utils.c ../event.c ../lib.c misc.c
misc.h ../loop.S
diff --git
a/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr0_exceptionbits_test.c
b/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr0_exceptionbits_test.c
new file mode 100644
index 000000000000..4de0b40264c9
--- /dev/null
+++
b/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr0_exceptionbits_test.c
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2022, Athira Rajeev, IBM Corp.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "../event.h"
+#include "misc.h"
+#include "utils.h"
+
+extern void thirty_two_instruction_loop(int loops);
+
+/*
+ * A perf sampling test for mmcr0
+ * fields : pmae, pmao.
+ */
+static int mmcr0_exceptionbits(void)
+{
+ struct event event;
+ u64 *intr_regs;
+
+ /* Check for platform support for the test */
+ SKIP_IF(check_pvr_for_sampling_tests());
+
+ /* Init the event for the sampling test */
+ event_init_sampling(&event, 0x500fa);
+ event.attr.sample_regs_intr = platform_extended_mask;
+ FAIL_IF(event_open(&event));
+ event.mmap_buffer = event_sample_buf_mmap(event.fd, 1);
+
+ event_enable(&event);
+
+ /* workload to make the event overflow */
+ thirty_two_instruction_loop(10000);
+
+ 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 pmae is cleared and pmao is set in MMCR0 */
+ FAIL_IF(GET_MMCR_FIELD(0, get_reg_value(intr_regs, "MMCR0"), 5, pmae));
+ FAIL_IF(!GET_MMCR_FIELD(0, get_reg_value(intr_regs, "MMCR0"), 5, pmao));
+
+ event_close(&event);
+ return 0;
+}
+
+int main(void)
+{
+ FAIL_IF(test_harness(mmcr0_exceptionbits, "mmcr0_exceptionbits"));
+}
--
2.27.0
