linux-kernel - [PATCH v3] cpupower : Handle set and info subcommands correctly

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Date:   Thu, 17 Oct 2019 00:56:39 -0500
From:   Abhishek Goel <huntbag@...ux.vnet.ibm.com>
To:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     shuah@...nel.org, trenn@...e.com, ego@...ux.vnet.ibm.com,
        Abhishek Goel <huntbag@...ux.vnet.ibm.com>
Subject: [PATCH v3] cpupower : Handle set and info subcommands correctly

Cpupower tool has set and info options which are being used only by
x86 machines. This patch removes support for these two subcommands
from cpupower utility for POWER. Thus, these two subcommands will now be
available only for intel.
This removes the ambiguous error message while using set option in case
of using non-intel systems.

Without this patch on a POWER system:

root@...ntu:~# cpupower info
System does not support Intel's performance bias setting

root@...ntu:~# cpupower set -b 10
Error setting perf-bias value on CPU

With this patch on a POWER box:

root@...ntu:~# cpupower info
Subcommand not supported on POWER

Same result for set subcommand.
This patch does not affect results on a intel box.

Signed-off-by: Abhishek Goel <huntbag@...ux.vnet.ibm.com>
Acked-by: Thomas Renninger <trenn@...e.de>
---

v1 -> v2 : Instead of bailing out early in set and info commands, in V2,
           we are cutting out support for these two commands for non-intel
           systems.
v2 -> v3 : Using architecture identification in subcommands to make
           decision instead of cutting out support altogether

 tools/power/cpupower/utils/cpupower-info.c | 9 +++++++++
 tools/power/cpupower/utils/cpupower-set.c  | 9 +++++++++
 2 files changed, 18 insertions(+)

diff --git a/tools/power/cpupower/utils/cpupower-info.c b/tools/power/cpupower/utils/cpupower-info.c
index 4c9d342b70ff..d3755ea70d4d 100644
--- a/tools/power/cpupower/utils/cpupower-info.c
+++ b/tools/power/cpupower/utils/cpupower-info.c
@@ -10,6 +10,7 @@
 #include <errno.h>
 #include <string.h>
 #include <getopt.h>
+#include <sys/utsname.h>
 
 #include "helpers/helpers.h"
 #include "helpers/sysfs.h"
@@ -30,6 +31,7 @@ int cmd_info(int argc, char **argv)
 	extern char *optarg;
 	extern int optind, opterr, optopt;
 	unsigned int cpu;
+	struct utsname uts;
 
 	union {
 		struct {
@@ -39,6 +41,13 @@ int cmd_info(int argc, char **argv)
 	} params = {};
 	int ret = 0;
 
+	ret = uname(&uts);
+	if (!ret && (!strcmp(uts.machine, "ppc64le") ||
+		     !strcmp(uts.machine, "ppc64"))) {
+		fprintf(stderr, _("Subcommand not supported on POWER.\n"));
+		return ret;
+	}
+
 	setlocale(LC_ALL, "");
 	textdomain(PACKAGE);
 
diff --git a/tools/power/cpupower/utils/cpupower-set.c b/tools/power/cpupower/utils/cpupower-set.c
index 3cd95c6cb974..3cca6f715dd9 100644
--- a/tools/power/cpupower/utils/cpupower-set.c
+++ b/tools/power/cpupower/utils/cpupower-set.c
@@ -10,6 +10,7 @@
 #include <errno.h>
 #include <string.h>
 #include <getopt.h>
+#include <sys/utsname.h>
 
 #include "helpers/helpers.h"
 #include "helpers/sysfs.h"
@@ -31,6 +32,7 @@ int cmd_set(int argc, char **argv)
 	extern char *optarg;
 	extern int optind, opterr, optopt;
 	unsigned int cpu;
+	struct utsname uts;
 
 	union {
 		struct {
@@ -41,6 +43,13 @@ int cmd_set(int argc, char **argv)
 	int perf_bias = 0;
 	int ret = 0;
 
+	ret = uname(&uts);
+	if (!ret && (!strcmp(uts.machine, "ppc64le") ||
+		     !strcmp(uts.machine, "ppc64"))) {
+		fprintf(stderr, _("Subcommand not supported on POWER.\n"));
+		return ret;
+	}
+
 	setlocale(LC_ALL, "");
 	textdomain(PACKAGE);
 
-- 
2.17.1