[GIT PULL] cpupower fixes update for Linux 7.0-rc4
From: Shuah Khan
Date: Fri Mar 06 2026 - 15:44:18 EST
Hi Rafael,
Please pull the following cpupower fixes update for Linux 7.0-rc4.
- Adds support for setting EPP via systemd service
- Fixes swapped power/energy unit labels
- Adds intel_pstate turbo boost support for Intel platforms
diff is attached. These aren't very critical. Please send them
when you send your next PR.
thanks,
-- Shuah
----------------------------------------------------------------
The following changes since commit 6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f:
Linux 7.0-rc1 (2026-02-22 13:18:59 -0800)
are available in the Git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux tags/linux-cpupower-7.0-rc4
for you to fetch changes up to 3817b1d34432d3d83a61576719570d04c341b7cd:
cpupower: Add intel_pstate turbo boost support for Intel platforms (2026-03-03 11:18:53 -0700)
----------------------------------------------------------------
linux-cpupower-7.0-rc4
- Adds support for setting EPP via systemd service
- Fixes swapped power/energy unit labels
- Adds intel_pstate turbo boost support for Intel platforms
----------------------------------------------------------------
Jan Kiszka (1):
cpupower: Add support for setting EPP via systemd service
Kaushlendra Kumar (1):
cpupower: fix swapped power/energy unit labels
Zhang Rui (1):
cpupower: Add intel_pstate turbo boost support for Intel platforms
tools/power/cpupower/cpupower-service.conf | 5 ++++
tools/power/cpupower/cpupower.sh | 6 ++++
tools/power/cpupower/utils/cpupower-set.c | 6 +++-
tools/power/cpupower/utils/helpers/helpers.h | 5 +++-
tools/power/cpupower/utils/helpers/misc.c | 41 ++++++++++++++++++++++++++--
tools/power/cpupower/utils/powercap-info.c | 4 +--
6 files changed, 61 insertions(+), 6 deletions(-)
----------------------------------------------------------------diff --git a/tools/power/cpupower/cpupower-service.conf b/tools/power/cpupower/cpupower-service.conf
index 02eabe8e3614..abbb46967565 100644
--- a/tools/power/cpupower/cpupower-service.conf
+++ b/tools/power/cpupower/cpupower-service.conf
@@ -30,3 +30,8 @@
# its policy for the relative importance of performance versus energy savings to
# the processor. See man CPUPOWER-SET(1) for additional details
#PERF_BIAS=
+
+# Set the Energy Performance Preference
+# Available options can be read from
+# /sys/devices/system/cpu/cpufreq/policy0/energy_performance_available_preferences
+#EPP=
diff --git a/tools/power/cpupower/cpupower.sh b/tools/power/cpupower/cpupower.sh
index a37dd4cfdb2b..6283e8bf275d 100644
--- a/tools/power/cpupower/cpupower.sh
+++ b/tools/power/cpupower/cpupower.sh
@@ -23,4 +23,10 @@ then
cpupower set -b "$PERF_BIAS" > /dev/null || ESTATUS=1
fi
+# apply Energy Performance Preference
+if test -n "$EPP"
+then
+ cpupower set -e "$EPP" > /dev/null || ESTATUS=1
+fi
+
exit $ESTATUS
diff --git a/tools/power/cpupower/utils/cpupower-set.c b/tools/power/cpupower/utils/cpupower-set.c
index c2117e5650dd..550a942e72ce 100644
--- a/tools/power/cpupower/utils/cpupower-set.c
+++ b/tools/power/cpupower/utils/cpupower-set.c
@@ -124,7 +124,11 @@ int cmd_set(int argc, char **argv)
}
if (params.turbo_boost) {
- ret = cpupower_set_turbo_boost(turbo_boost);
+ if (cpupower_cpu_info.vendor == X86_VENDOR_INTEL)
+ ret = cpupower_set_intel_turbo_boost(turbo_boost);
+ else
+ ret = cpupower_set_generic_turbo_boost(turbo_boost);
+
if (ret)
fprintf(stderr, "Error setting turbo-boost\n");
}
diff --git a/tools/power/cpupower/utils/helpers/helpers.h b/tools/power/cpupower/utils/helpers/helpers.h
index 82ea62bdf5a2..a3ad80b9c2c2 100644
--- a/tools/power/cpupower/utils/helpers/helpers.h
+++ b/tools/power/cpupower/utils/helpers/helpers.h
@@ -104,7 +104,7 @@ extern struct cpupower_cpu_info cpupower_cpu_info;
/* cpuid and cpuinfo helpers **************************/
int cpufreq_has_generic_boost_support(bool *active);
-int cpupower_set_turbo_boost(int turbo_boost);
+int cpupower_set_generic_turbo_boost(int turbo_boost);
/* X86 ONLY ****************************************/
#if defined(__i386__) || defined(__x86_64__)
@@ -143,6 +143,7 @@ extern int decode_pstates(unsigned int cpu, int boost_states,
int cpufreq_has_x86_boost_support(unsigned int cpu, int *support,
int *active, int *states);
+int cpupower_set_intel_turbo_boost(int turbo_boost);
/* AMD P-State stuff **************************/
bool cpupower_amd_pstate_enabled(void);
@@ -189,6 +190,8 @@ static inline int cpupower_set_amd_pstate_mode(char *mode)
static inline int cpufreq_has_x86_boost_support(unsigned int cpu, int *support,
int *active, int *states)
{ return -1; }
+static inline int cpupower_set_intel_turbo_boost(int turbo_boost)
+{ return -1; }
static inline bool cpupower_amd_pstate_enabled(void)
{ return false; }
diff --git a/tools/power/cpupower/utils/helpers/misc.c b/tools/power/cpupower/utils/helpers/misc.c
index 166dc1e470ea..eebfc79a4889 100644
--- a/tools/power/cpupower/utils/helpers/misc.c
+++ b/tools/power/cpupower/utils/helpers/misc.c
@@ -19,6 +19,9 @@ int cpufreq_has_x86_boost_support(unsigned int cpu, int *support, int *active,
{
int ret;
unsigned long long val;
+ char linebuf[MAX_LINE_LEN];
+ char path[SYSFS_PATH_MAX];
+ char *endp;
*support = *active = *states = 0;
@@ -42,8 +45,42 @@ int cpufreq_has_x86_boost_support(unsigned int cpu, int *support, int *active,
}
} else if (cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_PSTATE) {
amd_pstate_boost_init(cpu, support, active);
- } else if (cpupower_cpu_info.caps & CPUPOWER_CAP_INTEL_IDA)
+ } else if (cpupower_cpu_info.caps & CPUPOWER_CAP_INTEL_IDA) {
*support = *active = 1;
+
+ snprintf(path, sizeof(path), PATH_TO_CPU "intel_pstate/no_turbo");
+
+ if (!is_valid_path(path))
+ return 0;
+
+ if (cpupower_read_sysfs(path, linebuf, MAX_LINE_LEN) == 0)
+ return -1;
+
+ val = strtol(linebuf, &endp, 0);
+ if (endp == linebuf || errno == ERANGE)
+ return -1;
+
+ *active = !val;
+ }
+ return 0;
+}
+
+int cpupower_set_intel_turbo_boost(int turbo_boost)
+{
+ char path[SYSFS_PATH_MAX];
+ char linebuf[2] = {};
+
+ snprintf(path, sizeof(path), PATH_TO_CPU "intel_pstate/no_turbo");
+
+ /* Fallback to generic solution when intel_pstate driver not running */
+ if (!is_valid_path(path))
+ return cpupower_set_generic_turbo_boost(turbo_boost);
+
+ snprintf(linebuf, sizeof(linebuf), "%d", !turbo_boost);
+
+ if (cpupower_write_sysfs(path, linebuf, 2) <= 0)
+ return -1;
+
return 0;
}
@@ -274,7 +311,7 @@ void print_speed(unsigned long speed, int no_rounding)
}
}
-int cpupower_set_turbo_boost(int turbo_boost)
+int cpupower_set_generic_turbo_boost(int turbo_boost)
{
char path[SYSFS_PATH_MAX];
char linebuf[2] = {};
diff --git a/tools/power/cpupower/utils/powercap-info.c b/tools/power/cpupower/utils/powercap-info.c
index 3ea4486f1a0e..e53033488218 100644
--- a/tools/power/cpupower/utils/powercap-info.c
+++ b/tools/power/cpupower/utils/powercap-info.c
@@ -38,11 +38,11 @@ static int powercap_print_one_zone(struct powercap_zone *zone)
printf(" (%s)\n", mode ? "enabled" : "disabled");
if (zone->has_power_uw)
- printf(_("%sPower can be monitored in micro Jules\n"),
+ printf(_("%sPower can be monitored in micro Watts\n"),
pr_prefix);
if (zone->has_energy_uj)
- printf(_("%sPower can be monitored in micro Watts\n"),
+ printf(_("%sPower can be monitored in micro Jules\n"),
pr_prefix);
printf("\n");