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Message-ID: <20241019124233.194140-2-t.v.s10123@gmail.com>
Date: Sat, 19 Oct 2024 18:12:34 +0530
From: Vishnu Sanal T <t.v.s10123@...il.com>
To: linux-pm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
trenn@...e.com,
shuah@...nel.org,
jwyatt@...hat.com,
jkacur@...hat.com,
Vishnu Sanal T <t.v.s10123@...il.com>
Subject: [PATCH] implement set_enabled functions on powercap.c
Implement the functions sysfs_set_enabled, powercap_set_enabled,
and powercap_zone_set_enabled on powercap.c.
Signed-off-by: Vishnu Sanal T <t.v.s10123@...il.com>
---
tools/power/cpupower/lib/powercap.c | 43 +++++++++++++++++++++++++----
1 file changed, 37 insertions(+), 6 deletions(-)
diff --git a/tools/power/cpupower/lib/powercap.c b/tools/power/cpupower/lib/powercap.c
index 94a0c69e55ef..1cf2b0de5536 100644
--- a/tools/power/cpupower/lib/powercap.c
+++ b/tools/power/cpupower/lib/powercap.c
@@ -70,6 +70,29 @@ static int sysfs_get_enabled(char *path, int *mode)
return ret;
}
+static int sysfs_set_enabled(char *path, int mode)
+{
+ int fd;
+ char yes_no = (char) (mode + '0');
+ int ret = 0;
+
+ fd = open(path, O_RDWR);
+ if (fd == -1) {
+ ret = -1;
+ goto out;
+ }
+
+ if (write(fd, &yes_no, 1) != 1) {
+ ret = -1;
+ goto out_close;
+ }
+
+out_close:
+ close(fd);
+out:
+ return ret;
+}
+
int powercap_get_enabled(int *mode)
{
char path[SYSFS_PATH_MAX] = PATH_TO_POWERCAP "/intel-rapl/enabled";
@@ -77,12 +100,11 @@ int powercap_get_enabled(int *mode)
return sysfs_get_enabled(path, mode);
}
-/*
- * TODO: implement function. Returns dummy 0 for now.
- */
int powercap_set_enabled(int mode)
{
- return 0;
+ char path[SYSFS_PATH_MAX] = PATH_TO_POWERCAP "/intel-rapl/enabled";
+
+ return sysfs_set_enabled(path, mode);
}
/*
@@ -180,8 +202,17 @@ int powercap_zone_get_enabled(struct powercap_zone *zone, int *mode)
int powercap_zone_set_enabled(struct powercap_zone *zone, int mode)
{
- /* To be done if needed */
- return 0;
+ char path[SYSFS_PATH_MAX] = PATH_TO_POWERCAP;
+
+ if ((strlen(PATH_TO_POWERCAP) + strlen(zone->sys_name)) +
+ strlen("/enabled") + 1 >= SYSFS_PATH_MAX)
+ return -1;
+
+ strcat(path, "/");
+ strcat(path, zone->sys_name);
+ strcat(path, "/enabled");
+
+ return sysfs_set_enabled(path, mode);
}
--
2.47.0
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