From: Madhavan Srinivasan <ma...@linux.ibm.com>
The testcases uses cycles event to verify the freeze counter
settings in Monitor Mode Control Register 2 (MMCR2). Event
modifier (exclude_kernel) setting is used for the event attribute
to check the FCxS and FCxH ( Freeze counter in privileged and
hypervisor state ) settings via perf interface.
Signed-off-by: Madhavan Srinivasan <ma...@linux.ibm.com>
---
.../powerpc/pmu/sampling_tests/Makefile | 6 +-
.../pmu/sampling_tests/mmcr2_fcs_fch_test.c | 67 +++++++++++++++++++
2 files changed, 71 insertions(+), 2 deletions(-)
create mode 100644
tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr2_fcs_fch_test.c
diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile
b/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile
index f01666d7f2e0..1deaab5a4ebf 100644
--- a/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile
+++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile
@@ -3,7 +3,8 @@ include ../../../../../../scripts/Kbuild.include
all: $(TEST_GEN_PROGS) mmcr0_exceptionbits_test.c mmcr0_cc56run_test.c
mmcr0_pmccext_test.c \
mmcr0_pmcjce_test.c mmcr0_fc56_pmc1ce_test.c
mmcr0_fc56_pmc56_test.c \
- mmcr1_comb_test.c mmcr1_sel_unit_cache_test.c
mmcr2_l2l3_test.c
+ mmcr1_comb_test.c mmcr1_sel_unit_cache_test.c
mmcr2_l2l3_test.c \
+ mmcr2_fcs_fch_test.c
noarg:
$(MAKE) -C ../../
@@ -16,7 +17,8 @@ no-pie-option := $(call try-run, echo 'int main() { return 0;
}' | \
TEST_GEN_PROGS := mmcr0_exceptionbits_test mmcr0_cc56run_test
mmcr0_pmccext_test \
mmcr0_pmcjce_test mmcr0_fc56_pmc1ce_test
mmcr0_fc56_pmc56_test \
- mmcr1_comb_test mmcr1_sel_unit_cache_test mmcr2_l2l3_test
+ mmcr1_comb_test mmcr1_sel_unit_cache_test mmcr2_l2l3_test \
+ mmcr2_fcs_fch_test
LDFLAGS += $(no-pie-option)
diff --git
a/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr2_fcs_fch_test.c
b/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr2_fcs_fch_test.c
new file mode 100644
index 000000000000..1c1c48ca7d4c
--- /dev/null
+++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcr2_fcs_fch_test.c
@@ -0,0 +1,67 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2022, Madhavan Srinivasan, 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 mmcr2
+ * fields : fcs, fch.
+ */
+static int mmcr2_fcs_fch(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, 0x1001e);
+ event.attr.sample_regs_intr = platform_extended_mask;
+ event.attr.exclude_kernel = 1;
+ 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 fcs and fch field of MMCR2 match
+ * with corresponding modifier fields.
+ */
+ if (is_pSeries())
+ FAIL_IF(GET_ATTR_FIELD(&event, exclude_kernel) !=
+ GET_MMCR_FIELD(2, get_reg_value(intr_regs, "MMCR2"), 1,
fcs));
+ else
+ FAIL_IF(GET_ATTR_FIELD(&event, exclude_kernel) !=
+ GET_MMCR_FIELD(2, get_reg_value(intr_regs, "MMCR2"), 1,
fch));
+
+ event_close(&event);
+ return 0;
+}
+
+int main(void)
+{
+ FAIL_IF(test_harness(mmcr2_fcs_fch, "mmcr2_fcs_fch"));
+}
--
2.27.0
