From: Kajol Jain <kj...@linux.ibm.com>
The testcase uses event code 0x35340401e0 for load
only sampling, to verify the settings of thresh compare field
in Monitor Mode Control Register A (MMCRA: 9-18 bits for power9
and MMCRA: 8-18 bits for power10). Testcase checks if the thresh compare
field is programmed correctly via perf interface to MMCRA
register.
Signed-off-by: Kajol Jain<kj...@linux.ibm.com>
---
.../powerpc/pmu/sampling_tests/Makefile | 2 +-
.../sampling_tests/mmcra_thresh_cmp_test.c | 74 +++++++++++++++++++
2 files changed, 75 insertions(+), 1 deletion(-)
create mode 100644
tools/testing/selftests/powerpc/pmu/sampling_tests/mmcra_thresh_cmp_test.c
diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile
b/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile
index a785c6a173b9..6508e6074bac 100644
--- a/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile
+++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile
@@ -4,7 +4,7 @@ CFLAGS += -m64
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 mmcr2_l2l3_test mmcr2_fcs_fch_test \
- mmcr3_src_test mmcra_thresh_marked_sample_test
+ mmcr3_src_test mmcra_thresh_marked_sample_test
mmcra_thresh_cmp_test
top_srcdir = ../../../../../..
include ../../../lib.mk
diff --git
a/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcra_thresh_cmp_test.c
b/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcra_thresh_cmp_test.c
new file mode 100644
index 000000000000..904362f172c9
--- /dev/null
+++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/mmcra_thresh_cmp_test.c
@@ -0,0 +1,74 @@
+// 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"
+
+/*
+ * Primary PMU event used here is PM_MRK_INST_CMPL (0x401e0)
+ * Threshold event selection used is issue to complete for cycles
+ * Sampling criteria is Load only sampling
+ */
+#define p9_EventCode 0x13E35340401e0
+#define p10_EventCode 0x35340401e0
+
+extern void thirty_two_instruction_loop_with_ll_sc(u64 loops, u64
*ll_sc_target);
+
+/* A perf sampling test to test mmcra fields */
+static int mmcra_thresh_cmp(void)
+{
+ struct event event;
+ u64 *intr_regs;
+ u64 dummy;
+
+ /* Check for platform support for the test */
+ SKIP_IF(check_pvr_for_sampling_tests());
+
+ /* Skip for comapt mode */
+ SKIP_IF(check_for_compat_mode());
+
+ /* Init the event for the sampling test */
+ if (!have_hwcap2(PPC_FEATURE2_ARCH_3_1)) {
+ event_init_sampling(&event, p9_EventCode);
+ } else {
+ event_init_sampling(&event, p10_EventCode);
+ event.attr.config1 = 1000;
+ }
+
+ 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 the 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 thresh cmp match with the corresponding event code
fields */
+ FAIL_IF(get_thresh_cmp_val(event) !=
+ get_mmcra_thd_cmp(get_reg_value(intr_regs, "MMCRA"),
4));
+
+ event_close(&event);
+ return 0;
+}
+
+int main(void)
+{
+ FAIL_IF(test_harness(mmcra_thresh_cmp, "mmcra_thresh_cmp"));
+}
--
2.35.1
