[GIT PULL] cpupower fixes update for Linux 7.3-rc1

[Shuah Khan <skhan@linuxfoundation.org>]

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Hi Rafael,

Please pull the cpupower update for Linux 7.3-rc1.

Adds support for generic CPPC display that depends only on standardized
fields, improving AMD specific implementation for the same.

Removes conditional return with no effect as part of tree-wide code clean
up effort.

diff is attached.

thanks,
-- Shuah

----------------------------------------------------------------
The following changes since commit dc59e4fea9d83f03bad6bddf3fa2e52491777482:

   Linux 7.2-rc1 (2026-06-28 12:01:31 -0700)

are available in the Git repository at:

   git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux tags/linux-cpupower-7.3-rc1

for you to fetch changes up to adfe0057326ffbc2cd5ff69a57ec0e50b5e74095:

   cpupower: remove conditional return with no effect (2026-08-04 13:12:06 -0600)

----------------------------------------------------------------
linux-cpupower-7.3-rc1

Adds support for generic CPPC display that depends only on standardized
fields, improving AMD specific implementation for the same.

Removes conditional return with no effect as part of tree-wide code clean
up effort.

----------------------------------------------------------------
Jeremy Linton (4):
       cpupower: Add generic CPPC performance display
       cpupower: Build and call CPPC information on non-AMD processors
       cpupower: Print kernel and hardware frequency information
       cpupower: Add libm to cpupower for generic CPPC view

Sang-Heon Jeon (1):
       cpupower: remove conditional return with no effect

  tools/power/cpupower/Makefile                |  6 +--
  tools/power/cpupower/utils/cpufreq-info.c    | 11 +++---
  tools/power/cpupower/utils/helpers/cppc.c    | 56 ++++++++++++++++++++++++++++
  tools/power/cpupower/utils/helpers/helpers.h |  2 +
  tools/power/cpupower/utils/powercap-info.c   |  2 -
  5 files changed, 67 insertions(+), 10 deletions(-)
  create mode 100644 tools/power/cpupower/utils/helpers/cppc.c
----------------------------------------------------------------

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diff --git a/tools/power/cpupower/Makefile b/tools/power/cpupower/Makefile
index 969716dfe8de..ab428e336d87 100644
--- a/tools/power/cpupower/Makefile
+++ b/tools/power/cpupower/Makefile
@@ -131,7 +131,7 @@ override CFLAGS += -DVERSION=\"$(VERSION)\" -DPACKAGE=\"$(PACKAGE)\" \
 
 UTIL_OBJS =  utils/helpers/amd.o utils/helpers/msr.o \
 	utils/helpers/sysfs.o utils/helpers/misc.o utils/helpers/cpuid.o \
-	utils/helpers/pci.o utils/helpers/bitmask.o \
+	utils/helpers/pci.o utils/helpers/bitmask.o utils/helpers/cppc.o \
 	utils/idle_monitor/nhm_idle.o utils/idle_monitor/snb_idle.o \
 	utils/idle_monitor/hsw_ext_idle.o \
 	utils/idle_monitor/amd_fam14h_idle.o utils/idle_monitor/cpuidle_sysfs.o \
@@ -236,9 +236,9 @@ $(OUTPUT)%.o: %.c
 $(OUTPUT)cpupower: $(UTIL_OBJS) $(OUTPUT)$(LIBCPUPOWER)
 	$(ECHO) "  CC      " $@
 ifeq ($(strip $(STATIC)),true)
-	$(QUIET) $(CC) $(CFLAGS) $(LDFLAGS) $(UTIL_OBJS) -lrt -lpci -L$(OUTPUT) -o $@
+	$(QUIET) $(CC) $(CFLAGS) $(LDFLAGS) $(UTIL_OBJS) -lm -lrt -lpci -L$(OUTPUT) -o $@
 else
-	$(QUIET) $(CC) $(CFLAGS) $(LDFLAGS) $(UTIL_OBJS) -lcpupower -lrt -lpci -L$(OUTPUT) -o $@
+	$(QUIET) $(CC) $(CFLAGS) $(LDFLAGS) $(UTIL_OBJS) -lm -lcpupower -lrt -lpci -L$(OUTPUT) -o $@
 endif
 	$(QUIET) $(STRIPCMD) $@
 
diff --git a/tools/power/cpupower/utils/cpufreq-info.c b/tools/power/cpupower/utils/cpufreq-info.c
index 5a242b491a9d..11629ae49f98 100644
--- a/tools/power/cpupower/utils/cpufreq-info.c
+++ b/tools/power/cpupower/utils/cpufreq-info.c
@@ -270,10 +270,10 @@ static int get_freq_hardware(unsigned int cpu, unsigned int human)
 {
 	unsigned long freq;
 
-	if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_APERF))
+	freq = cpufreq_get_freq_hardware(cpu);
+	if (!(cpupower_cpu_info.caps & CPUPOWER_CAP_APERF) && !freq)
 		return -EINVAL;
 
-	freq = cpufreq_get_freq_hardware(cpu);
 	printf(_("  current CPU frequency: "));
 	if (!freq) {
 		printf("Unable to call hardware\n");
@@ -477,12 +477,13 @@ static int get_latency(unsigned int cpu, unsigned int human)
 }
 
 /* --performance / -c */
-
 static int get_perf_cap(unsigned int cpu)
 {
 	if (cpupower_cpu_info.vendor == X86_VENDOR_AMD &&
 	    cpupower_cpu_info.caps & CPUPOWER_CAP_AMD_PSTATE)
 		amd_pstate_show_perf_and_freq(cpu, no_rounding);
+	else
+		cppc_show_perf_and_freq(cpu, no_rounding);
 
 	return 0;
 }
@@ -513,8 +514,8 @@ static void debug_output_one(unsigned int cpu)
 
 	get_available_governors(cpu);
 	get_policy(cpu);
-	if (get_freq_hardware(cpu, 1) < 0)
-		get_freq_kernel(cpu, 1);
+	get_freq_hardware(cpu, 1);
+	get_freq_kernel(cpu, 1);
 	get_boost_mode(cpu);
 	get_perf_cap(cpu);
 }
diff --git a/tools/power/cpupower/utils/helpers/cppc.c b/tools/power/cpupower/utils/helpers/cppc.c
new file mode 100644
index 000000000000..3493ce8551ea
--- /dev/null
+++ b/tools/power/cpupower/utils/helpers/cppc.c
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+
+#include "helpers/helpers.h"
+#include "cpufreq.h"
+#include "acpi_cppc.h"
+
+#define cppc_to_frequency(perf) (roundf(slope * (perf) + intercept))
+
+void cppc_show_perf_and_freq(unsigned int cpu, int no_rounding)
+{
+	int64_t nominal = acpi_cppc_get_data(cpu, NOMINAL_PERF);
+	int64_t nominal_freq = acpi_cppc_get_data(cpu, NOMINAL_FREQ) * 1000;
+	int64_t lowest = acpi_cppc_get_data(cpu, LOWEST_PERF);
+	int64_t lowest_freq = acpi_cppc_get_data(cpu, LOWEST_FREQ) * 1000;
+	unsigned long non_linear = acpi_cppc_get_data(cpu, LOWEST_NONLINEAR_PERF);
+	unsigned long highest = acpi_cppc_get_data(cpu, HIGHEST_PERF);
+	float slope, intercept;
+
+	/* do the optional freq fields look invalid? */
+	if (!nominal_freq || !lowest_freq || nominal == lowest)
+		return;
+
+	slope = (float)(nominal_freq - lowest_freq) / (nominal - lowest);
+	intercept = lowest_freq - slope * lowest;
+
+	printf(_("  CPPC limits:\n"));
+	printf(_("    Highest Performance: %lu. Maximum Frequency: "),
+	       highest);
+	/*
+	 * If boost isn't active, the cpuinfo_max doesn't indicate real max
+	 * frequency.
+	 */
+	print_speed(cppc_to_frequency(highest), no_rounding);
+	printf(".\n");
+
+	printf(_("    Nominal Performance: %lu. Nominal Frequency: "),
+	       acpi_cppc_get_data(cpu, NOMINAL_PERF));
+	print_speed(nominal_freq,  no_rounding);
+	printf(".\n");
+
+	printf(_("    Lowest Non-linear Performance: %lu. Lowest Non-linear Frequency: "),
+	       non_linear);
+	print_speed(cppc_to_frequency(non_linear), no_rounding);
+	printf(".\n");
+
+	printf(_("    Lowest Performance: %lu. Lowest Frequency: "),
+	       acpi_cppc_get_data(cpu, LOWEST_PERF));
+	print_speed(lowest_freq, no_rounding);
+	printf(".\n");
+}
diff --git a/tools/power/cpupower/utils/helpers/helpers.h b/tools/power/cpupower/utils/helpers/helpers.h
index a3ad80b9c2c2..9c5126b63966 100644
--- a/tools/power/cpupower/utils/helpers/helpers.h
+++ b/tools/power/cpupower/utils/helpers/helpers.h
@@ -221,4 +221,6 @@ void print_online_cpus(void);
 void print_offline_cpus(void);
 void print_speed(unsigned long speed, int no_rounding);
 
+void cppc_show_perf_and_freq(unsigned int cpu, int no_rounding);
+
 #endif /* __CPUPOWERUTILS_HELPERS__ */
diff --git a/tools/power/cpupower/utils/powercap-info.c b/tools/power/cpupower/utils/powercap-info.c
index e53033488218..88a5edb76315 100644
--- a/tools/power/cpupower/utils/powercap-info.c
+++ b/tools/power/cpupower/utils/powercap-info.c
@@ -47,8 +47,6 @@ static int powercap_print_one_zone(struct powercap_zone *zone)
 
 	printf("\n");
 
-	if (ret != 0)
-		return ret;
 	return ret;
 }