linux-kernel - [PATCH v2 3/3] perf test: Add selftest to test IBS invocation via core pmu events

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Date:   Thu, 9 Mar 2023 15:41:11 +0530
From:   Ravi Bangoria <ravi.bangoria@....com>
To:     <peterz@...radead.org>
CC:     <ravi.bangoria@....com>, <namhyung@...nel.org>,
        <eranian@...gle.com>, <acme@...nel.org>, <mark.rutland@....com>,
        <jolsa@...nel.org>, <irogers@...gle.com>, <bp@...en8.de>,
        <x86@...nel.org>, <linux-perf-users@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <sandipan.das@....com>,
        <ananth.narayan@....com>, <santosh.shukla@....com>
Subject: [PATCH v2 3/3] perf test: Add selftest to test IBS invocation via core pmu events

IBS pmu can be invoked via fixed set of core pmu events. Add a simple
event open test for all these events.

Without kernel fix:
  $ sudo ./perf test -vv 76
   76: IBS via core pmu                                                :
  --- start ---
  test child forked, pid 6553
  Using CPUID AuthenticAMD-25-1-1
  type: 0x0, config: 0x0, fd: 3  -  Pass
  type: 0x0, config: 0x1, fd: -1  -  Pass
  type: 0x4, config: 0x76, fd: -1  -  Fail
  type: 0x4, config: 0xc1, fd: -1  -  Fail
  type: 0x4, config: 0x12, fd: -1  -  Pass
  test child finished with -1
  ---- end ----
  IBS via core pmu: FAILED!

With kernel fix:
  $ sudo ./perf test -vv 76
   76: IBS via core pmu                                                :
  --- start ---
  test child forked, pid 7526
  Using CPUID AuthenticAMD-25-1-1
  type: 0x0, config: 0x0, fd: 3  -  Pass
  type: 0x0, config: 0x1, fd: -1  -  Pass
  type: 0x4, config: 0x76, fd: 3  -  Pass
  type: 0x4, config: 0xc1, fd: 3  -  Pass
  type: 0x4, config: 0x12, fd: -1  -  Pass
  test child finished with 0
  ---- end ----
  IBS via core pmu: Ok

Signed-off-by: Ravi Bangoria <ravi.bangoria@....com>
---
 tools/perf/tests/Build              |  1 +
 tools/perf/tests/builtin-test.c     |  1 +
 tools/perf/tests/ibs-via-core-pmu.c | 70 +++++++++++++++++++++++++++++
 tools/perf/tests/tests.h            |  1 +
 4 files changed, 73 insertions(+)
 create mode 100644 tools/perf/tests/ibs-via-core-pmu.c

diff --git a/tools/perf/tests/Build b/tools/perf/tests/Build
index fb9ac5dc4079..1a232cf13c33 100644
--- a/tools/perf/tests/Build
+++ b/tools/perf/tests/Build
@@ -69,6 +69,7 @@ perf-y += dlfilter-test.o
 perf-y += sigtrap.o
 perf-y += event_groups.o
 perf-y += symbols.o
+perf-y += ibs-via-core-pmu.o
 
 $(OUTPUT)tests/llvm-src-base.c: tests/bpf-script-example.c tests/Build
 	$(call rule_mkdir)
diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index 35cc3807cc9e..aed887234500 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -119,6 +119,7 @@ static struct test_suite *generic_tests[] = {
 	&suite__sigtrap,
 	&suite__event_groups,
 	&suite__symbols,
+	&suite__ibs_via_core_pmu,
 	NULL,
 };
 
diff --git a/tools/perf/tests/ibs-via-core-pmu.c b/tools/perf/tests/ibs-via-core-pmu.c
new file mode 100644
index 000000000000..6ac539509791
--- /dev/null
+++ b/tools/perf/tests/ibs-via-core-pmu.c
@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "linux/perf_event.h"
+#include "tests.h"
+#include "pmu.h"
+#include "pmus.h"
+#include "../perf-sys.h"
+#include "debug.h"
+
+#define NR_SUB_TESTS 5
+
+static struct sub_tests {
+	int type;
+	unsigned long config;
+	bool valid;
+} sub_tests[NR_SUB_TESTS] = {
+	{ PERF_TYPE_HARDWARE, PERF_COUNT_HW_CPU_CYCLES, true },
+	{ PERF_TYPE_HARDWARE, PERF_COUNT_HW_INSTRUCTIONS, false },
+	{ PERF_TYPE_RAW, 0x076, true },
+	{ PERF_TYPE_RAW, 0x0C1, true },
+	{ PERF_TYPE_RAW, 0x012, false },
+};
+
+static int event_open(int type, unsigned long config)
+{
+	struct perf_event_attr attr;
+
+	memset(&attr, 0, sizeof(struct perf_event_attr));
+	attr.type = type;
+	attr.size = sizeof(struct perf_event_attr);
+	attr.config = config;
+	attr.disabled = 1;
+	attr.precise_ip = 1;
+	attr.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
+	attr.sample_period = 100000;
+
+	return sys_perf_event_open(&attr, -1, 0, -1, 0);
+}
+
+static int test__ibs_via_core_pmu(struct test_suite *text __maybe_unused,
+				  int subtest __maybe_unused)
+{
+	struct perf_pmu *ibs_pmu;
+	int ret = TEST_OK;
+	int fd, i;
+
+	if (list_empty(&pmus))
+		perf_pmu__scan(NULL);
+
+	ibs_pmu = perf_pmu__find("ibs_op");
+	if (!ibs_pmu)
+		return TEST_SKIP;
+
+	for (i = 0; i < NR_SUB_TESTS; i++) {
+		fd = event_open(sub_tests[i].type, sub_tests[i].config);
+		pr_debug("type: 0x%x, config: 0x%lx, fd: %d  -  ", sub_tests[i].type,
+			 sub_tests[i].config, fd);
+		if ((sub_tests[i].valid && fd == -1) ||
+		    (!sub_tests[i].valid && fd > 0)) {
+			pr_debug("Fail\n");
+			ret = TEST_FAIL;
+		} else {
+			pr_debug("Pass\n");
+			close(fd);
+		}
+	}
+
+	return ret;
+}
+
+DEFINE_SUITE("IBS via core pmu", ibs_via_core_pmu);
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index 9a0f3904e53d..36339fdf9c36 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -149,6 +149,7 @@ DECLARE_SUITE(dlfilter);
 DECLARE_SUITE(sigtrap);
 DECLARE_SUITE(event_groups);
 DECLARE_SUITE(symbols);
+DECLARE_SUITE(ibs_via_core_pmu);
 
 /*
  * PowerPC and S390 do not support creation of instruction breakpoints using the
-- 
2.39.2