linux-kernel - [PATCH v8 10/13] selftests/resctrl: Add vendor detection mechanism

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Date:   Wed, 27 Nov 2019 16:39:41 -0800
From:   Fenghua Yu <fenghua.yu@...el.com>
To:     "Thomas Gleixner" <tglx@...utronix.de>,
        "Ingo Molnar" <mingo@...hat.com>, "Borislav Petkov" <bp@...en8.de>,
        "H Peter Anvin" <hpa@...or.com>, "Tony Luck" <tony.luck@...el.com>,
        "Reinette Chatre" <reinette.chatre@...el.com>,
        "Babu Moger" <babu.moger@....com>,
        "Andre Przywara" <Andre.Przywara@....com>,
        "Sai Praneeth Prakhya" <sai.praneeth.prakhya@...el.com>,
        "Ravi V Shankar" <ravi.v.shankar@...el.com>
Cc:     "linux-kernel" <linux-kernel@...r.kernel.org>,
        "x86" <x86@...nel.org>, Fenghua Yu <fenghua.yu@...el.com>
Subject: [PATCH v8 10/13] selftests/resctrl: Add vendor detection mechanism

From: Babu Moger <babu.moger@....com>

RESCTRL feature is supported both on Intel and AMD now. Some features
are implemented differently. Add vendor detection mechanism. Use the vendor
check where there are differences.

Signed-off-by: Babu Moger <babu.moger@....com>
Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
---
 tools/testing/selftests/resctrl/resctrl.h     |  1 +
 .../testing/selftests/resctrl/resctrl_tests.c | 24 +++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h
index 99659639e580..cd2ea1d2cad9 100644
--- a/tools/testing/selftests/resctrl/resctrl.h
+++ b/tools/testing/selftests/resctrl/resctrl.h
@@ -66,6 +66,7 @@ pid_t bm_pid, ppid;
 int tests_run;
 
 char llc_occup_path[1024];
+bool is_amd;
 
 bool check_resctrlfs_support(void);
 int filter_dmesg(void);
diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c
index 7f75b0b01bb5..884e918b1e97 100644
--- a/tools/testing/selftests/resctrl/resctrl_tests.c
+++ b/tools/testing/selftests/resctrl/resctrl_tests.c
@@ -13,6 +13,27 @@
 #define BENCHMARK_ARGS		64
 #define BENCHMARK_ARG_SIZE	64
 
+bool is_amd;
+
+void detect_amd(void)
+{
+	FILE *inf = fopen("/proc/cpuinfo", "r");
+	char *res;
+
+	if (!inf)
+		return;
+
+	res = fgrep(inf, "vendor_id");
+
+	if (res) {
+		char *s = strchr(res, ':');
+
+		is_amd = s && !strcmp(s, ": AuthenticAMD\n");
+		free(res);
+	}
+	fclose(inf);
+}
+
 static void cmd_help(void)
 {
 	printf("usage: resctrl_tests [-h] [-b \"benchmark_cmd [options]\"] [-t test list] [-n no_of_bits]\n");
@@ -107,6 +128,9 @@ int main(int argc, char **argv)
 	if (geteuid() != 0)
 		printf("# WARNING: not running as root, tests may fail.\n");
 
+	/* Detect AMD vendor */
+	detect_amd();
+
 	if (has_ben) {
 		/* Extract benchmark command from command line. */
 		for (i = ben_ind; i < argc; i++) {
-- 
2.19.1