perf test: Add test for #system_tsc_freq in metrics

The value should be non-zero on Intel while zero on everything else.

Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Caleb Biggers <caleb.biggers@intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.garry@huawei.com>
Cc: Kshipra Bopardikar <kshipra.bopardikar@intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Perry Taylor <perry.taylor@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Link: https://lore.kernel.org/r/20220718164312.3994191-4-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/expr.c

@@ -1,8 +1,10 @@
 // SPDX-License-Identifier: GPL-2.0
 #include "util/debug.h"
 #include "util/expr.h"
+#include "util/header.h"
 #include "util/smt.h"
 #include "tests.h"
+#include <math.h>
 #include <stdlib.h>
 #include <string.h>
 #include <linux/zalloc.h>
@@ -69,6 +71,11 @@ static int test__expr(struct test_suite *t __maybe_unused, int subtest __maybe_u
 	double val, num_cpus, num_cores, num_dies, num_packages;
 	int ret;
 	struct expr_parse_ctx *ctx;
+	bool is_intel = false;
+	char buf[128];
+
+	if (!get_cpuid(buf, sizeof(buf)))
+		is_intel = strstr(buf, "Intel") != NULL;
 
 	TEST_ASSERT_EQUAL("ids_union", test_ids_union(), 0);
 
@@ -175,6 +182,12 @@ static int test__expr(struct test_suite *t __maybe_unused, int subtest __maybe_u
 	if (num_dies) // Some platforms do not have CPU die support, for example s390
 		TEST_ASSERT_VAL("#num_dies >= #num_packages", num_dies >= num_packages);
 
+	TEST_ASSERT_VAL("#system_tsc_freq", expr__parse(&val, ctx, "#system_tsc_freq") == 0);
+	if (is_intel)
+		TEST_ASSERT_VAL("#system_tsc_freq > 0", val > 0);
+	else
+		TEST_ASSERT_VAL("#system_tsc_freq == 0", fpclassify(val) == FP_ZERO);
+
 	/*
 	 * Source count returns the number of events aggregating in a leader
 	 * event including the leader. Check parsing yields an id.