linux-cpupower-6.13-rc1

This cpupower update for Linux 6.13-rc1 consists of changes to:
 
 -- bindings:
    - add generated files to gitignore
    - improve disable c_state block
    - new test to confirm cpu state is disabled
 
 -- bench:
    - print config file path when open cpufreq-bench.conf fails
 
 -- Makefile
    - override cross-compiling env params to make it easier for builds
      in Yocto environment.
 
 -- add documentation for new EPP value change, amd_pstate mode change,
    and turbo-boost features.
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Merge tag 'linux-cpupower-6.13-rc1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/shuah/linux

Merge a cpupower utility update for 6.13-rc1 from Shuah Khan:

"This cpupower update for Linux 6.13-rc1 consists of changes to:

 -- bindings:
    - add generated files to gitignore
    - improve disable c_state block
    - new test to confirm cpu state is disabled

 -- bench:
    - print config file path when open cpufreq-bench.conf fails

 -- Makefile
    - override cross-compiling env params to make it easier for builds
      in Yocto environment.

 -- add documentation for new EPP value change, amd_pstate mode change,
    and turbo-boost features."

* tag 'linux-cpupower-6.13-rc1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/shuah/linux:
  pm: cpupower: bindings: Add test to confirm cpu state is disabled
  pm: cpupower: bindings: Improve disable c_state block
  pm: cpupower: gitignore: Add compile_commands.json
  pm: cpupower: Makefile: Allow overriding cross-compiling env params
  pm: cpupower: bench: print config file path when open cpufreq-bench.conf fails
  tools/power/cpupower: Add documentation for some recently introduced options

tools/power/cpupower/.gitignore

@@ -27,3 +27,6 @@ debug/i386/intel_gsic
 debug/i386/powernow-k8-decode
 debug/x86_64/centrino-decode
 debug/x86_64/powernow-k8-decode
+
+# Clang's compilation database file
+compile_commands.json

tools/power/cpupower/Makefile

@@ -86,12 +86,12 @@ INSTALL_SCRIPT = ${INSTALL} -m 644
 # If you are running a cross compiler, you may want to set this
 # to something more interesting, like "arm-linux-".  If you want
 # to compile vs uClibc, that can be done here as well.
-CROSS = #/usr/i386-linux-uclibc/usr/bin/i386-uclibc-
-CC = $(CROSS)gcc
-LD = $(CROSS)gcc
-AR = $(CROSS)ar
-STRIP = $(CROSS)strip
-RANLIB = $(CROSS)ranlib
+CROSS ?= #/usr/i386-linux-uclibc/usr/bin/i386-uclibc-
+CC ?= $(CROSS)gcc
+LD ?= $(CROSS)gcc
+AR ?= $(CROSS)ar
+STRIP ?= $(CROSS)strip
+RANLIB ?= $(CROSS)ranlib
 HOSTCC = gcc
 MKDIR = mkdir
 

tools/power/cpupower/bench/parse.c

@@ -4,6 +4,7 @@
  *  Copyright (C) 2008 Christian Kornacker <ckornacker@suse.de>
  */
 
+#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>
@@ -165,8 +166,8 @@ int prepare_config(const char *path, struct config *config)
 
 	configfile = fopen(path, "r");
 	if (configfile == NULL) {
-		perror("fopen");
-		fprintf(stderr, "error: unable to read configfile\n");
+		fprintf(stderr, "error: unable to read configfile: %s, %s\n",
+			path, strerror(errno));
 		free(config);
 		return 1;
 	}

tools/power/cpupower/bindings/python/test_raw_pylibcpupower.py

@@ -15,22 +15,38 @@ else:
     print(f"cstate count error: return code: {cpu_cstates_count}")
 
 """
-Disable cstate (will fail if the above is 0, ex: a virtual machine)
+Disable cstate (will fail if the above returns is under 1, ex: a virtual machine)
 """
 cstate_disabled = p.cpuidle_state_disable(0, 0, 1)
-if cpu_cstates_count == 0:
-    print(f"CPU 0 has {cpu_cstates_count} c-states")
-else:
-    print(f"cstate count error: return code: {cpu_cstates_count}")
 
 match cstate_disabled:
     case 0:
         print(f"CPU state disabled")
     case -1:
         print(f"Idlestate not available")
+    case -2:
+        print(f"Disabling is not supported by the kernel")
+    case -3:
+        print(f"No write access to disable/enable C-states: try using sudo")
     case _:
-        print(f"Not documented")
+        print(f"Not documented: {cstate_disabled}")
 
+"""
+Test cstate is disabled
+"""
+is_cstate_disabled = p.cpuidle_is_state_disabled(0, 0)
+
+match is_cstate_disabled:
+    case 1:
+        print(f"CPU is disabled")
+    case 0:
+        print(f"CPU is enabled")
+    case -1:
+        print(f"Idlestate not available")
+    case -2:
+        print(f"Disabling is not supported by kernel")
+    case _:
+        print(f"Not documented: {is_cstate_disabled}")
 
 # Pointer example
 

tools/power/cpupower/man/cpupower-set.1

@@ -3,7 +3,7 @@
 cpupower\-set \- Set processor power related kernel or hardware configurations
 .SH SYNOPSIS
 .ft B
-.B cpupower set [ \-b VAL ]
+.B cpupower set [ \-b VAL | \-e POLICY | \-m MODE | \-t BOOL ]
 
 
 .SH DESCRIPTION
@@ -19,7 +19,7 @@ described in the Options sections.
 Use \fBcpupower info \fP to read out current settings and whether they are
 supported on the system at all.
 
-.SH Options
+.SH OPTIONS
 .PP
 \-\-perf-bias, \-b
 .RS 4
@@ -56,6 +56,40 @@ Use \fBcpupower -c all info -b\fP to verify.
 This options needs the msr kernel driver (CONFIG_X86_MSR) loaded.
 .RE
 
+.PP
+\-\-epp, \-e
+.RS 4
+Sets the energy performance policy preference on supported Intel or AMD
+processors which use the Intel or AMD P-State cpufreq driver respectively.
+
+Available policies can be found with
+\fBcat /sys/devices/system/cpu/cpufreq/policy0/energy_performance_available_preferences\fP :
+.RS 4
+default performance balance_performance balance_power power
+.RE
+
+.RE
+
+.PP
+\-\-amd\-pstate\-mode, \-m
+.RS 4
+Sets the AMD P-State mode for supported AMD processors.
+Available modes are "active", "guided" or "passive".
+
+Refer to the AMD P-State kernel documentation for further information.
+
+.RE
+
+.PP
+\-\-turbo\-boost, \-t
+.RS 4
+This option is used to enable or disable the turbo boost feature on
+supported Intel and AMD processors.
+
+This option takes as parameter either \fB1\fP to enable, or \fB0\fP to disable the feature.
+
+.RE
+
 .SH "SEE ALSO"
 cpupower-info(1), cpupower-monitor(1), powertop(1)
 .PP