cpupower: Introduce powercap intel-rapl library helpers and powercap-info command

Read out powercap zone information via:
cpupower powercap-info
and show the zone hierarchy to the user:

./cpupower powercap-info
Driver: intel-rapl
Powercap domain hierarchy:

Zone: package-0 (enabled)
Power consumption can be monitored in micro Watts

Zone: core (disabled)
Power consumption can be monitored in micro Watts

Zone: uncore (disabled)
Power consumption can be monitored in micro Watts

Zone: dram (disabled)
Power consumption can be monitored in micro Watts

There is a dummy -a option for powercap-info which can/should be used to show more detailed info later. Like that other args can be added easily later as well.

A enable/disable option via powercap-set subcommand is also an enhancement for later.

Also not all RAPL domains are shown. The func walking through RAPL subdomains is restricted and hardcoded to: "intel-rapl/intel-rapl:0"
On my system above powercap domains map to:
intel-rapl/intel-rapl:0
-> pack (age-0)
intel-rapl/intel-rapl:0/intel-rapl:0:0
-> core
intel-rapl/intel-rapl:0/intel-rapl:0:1
-> uncore

Missing ones on my system are:
intel-rapl-mmio/intel-rapl-mmio:0
-> pack (age-0)

intel-rapl/intel-rapl:1
-> psys

This could get enhanced in:
struct powercap_zone *powercap_init_zones() and adopted to walk through all intel-rapl zones, but also to other powercap drivers like dtpm (Dynamic Thermal Power Management framework), cmp with: drivers/powercap/dtpm_*

Signed-off-by Thomas Renninger <[email protected]>

CC Shuah Khan <[email protected]>

---
  tools/power/cpupower/Makefile              |  14 ++-
  tools/power/cpupower/utils/builtin.h       |   2 +
  tools/power/cpupower/utils/cpupower.c      |   1 +
  tools/power/cpupower/utils/powercap-info.c | 113 +++++++++++++++++++++
  4 files changed, 126 insertions(+), 4 deletions(-)

create mode 100644 tools/power/cpupower/utils/powercap-info.c

tools/power/cpupower/Makefile +10 -4

index e9b6de314654..9fd3b309b3a6 100644
@@ -133,7 +133,7 @@ UTIL_OBJS =  utils/helpers/amd.o utils/helpers/msr.o \
  	utils/idle_monitor/mperf_monitor.o utils/idle_monitor/cpupower-monitor.o \
  	utils/cpupower.o utils/cpufreq-info.o utils/cpufreq-set.o \
  	utils/cpupower-set.o utils/cpupower-info.o utils/cpuidle-info.o \
-	utils/cpuidle-set.o
+	utils/cpuidle-set.o utils/powercap-info.o
 
  UTIL_SRC := $(UTIL_OBJS:.o=.c)
 

@@ -143,9 +143,12 @@ UTIL_HEADERS = utils/helpers/helpers.h utils/idle_monitor/cpupower-monitor.h \
  	utils/helpers/bitmask.h \
  	utils/idle_monitor/idle_monitors.h utils/idle_monitor/idle_monitors.def
 
-LIB_HEADERS = 	lib/cpufreq.h lib/cpupower.h lib/cpuidle.h lib/acpi_cppc.h
-LIB_SRC = 	lib/cpufreq.c lib/cpupower.c lib/cpuidle.c lib/acpi_cppc.c
-LIB_OBJS = 	lib/cpufreq.o lib/cpupower.o lib/cpuidle.o lib/acpi_cppc.o
+LIB_HEADERS = 	lib/cpufreq.h lib/cpupower.h lib/cpuidle.h lib/acpi_cppc.h \
+	lib/powercap.h
+LIB_SRC = 	lib/cpufreq.c lib/cpupower.c lib/cpuidle.c lib/acpi_cppc.c \
+	lib/powercap.c
+LIB_OBJS = 	lib/cpufreq.o lib/cpupower.o lib/cpuidle.o lib/acpi_cppc.o \
+	lib/powercap.o
  LIB_OBJS :=	$(addprefix $(OUTPUT),$(LIB_OBJS))
 
  override CFLAGS +=	-pipe

@@ -276,6 +279,7 @@ install-lib: libcpupower
  	$(INSTALL) -d $(DESTDIR)${includedir}
  	$(INSTALL_DATA) lib/cpufreq.h $(DESTDIR)${includedir}/cpufreq.h
  	$(INSTALL_DATA) lib/cpuidle.h $(DESTDIR)${includedir}/cpuidle.h
+	$(INSTALL_DATA) lib/powercap.h $(DESTDIR)${includedir}/powercap.h
 
  install-tools: $(OUTPUT)cpupower
  	$(INSTALL) -d $(DESTDIR)${bindir}

@@ -292,6 +296,7 @@ install-man:
  	$(INSTALL_DATA) -D man/cpupower-set.1 $(DESTDIR)${mandir}/man1/cpupower-set.1
  	$(INSTALL_DATA) -D man/cpupower-info.1 $(DESTDIR)${mandir}/man1/cpupower-info.1
  	$(INSTALL_DATA) -D man/cpupower-monitor.1 $(DESTDIR)${mandir}/man1/cpupower-monitor.1
+	$(INSTALL_DATA) -D man/cpupower-powercap-info.1 $(DESTDIR)${mandir}/man1/cpupower-powercap-info.1
 
  install-gmo: create-gmo
  	$(INSTALL) -d $(DESTDIR)${localedir}

@@ -321,6 +326,7 @@ uninstall:
  	- rm -f $(DESTDIR)${mandir}/man1/cpupower-set.1
  	- rm -f $(DESTDIR)${mandir}/man1/cpupower-info.1
  	- rm -f $(DESTDIR)${mandir}/man1/cpupower-monitor.1
+	- rm -f $(DESTDIR)${mandir}/man1/cpupower-powercap-info.1
  	- for HLANG in $(LANGUAGES); do \
  		rm -f $(DESTDIR)${localedir}/$$HLANG/LC_MESSAGES/cpupower.mo; \
  	  done;

tools/power/cpupower/utils/builtin.h +2 -0

index f7065ae60a14..e1caefd467cd 100644
@@ -8,6 +8,8 @@ extern int cmd_freq_set(int argc, const char **argv);
  extern int cmd_freq_info(int argc, const char **argv);
  extern int cmd_idle_set(int argc, const char **argv);
  extern int cmd_idle_info(int argc, const char **argv);
+extern int cmd_cap_info(int argc, const char **argv);
+extern int cmd_cap_set(int argc, const char **argv);
  extern int cmd_monitor(int argc, const char **argv);
 
  #endif

tools/power/cpupower/utils/cpupower.c +1 -0

index 8ac3304a9957..9ec973165af1 100644
@@ -54,6 +54,7 @@ static struct cmd_struct commands[] = {
  	{ "frequency-set",	cmd_freq_set,	1	},
  	{ "idle-info",		cmd_idle_info,	0	},
  	{ "idle-set",		cmd_idle_set,	1	},
+	{ "powercap-info",	cmd_cap_info,	0	},
  	{ "set",		cmd_set,	1	},
  	{ "info",		cmd_info,	0	},
  	{ "monitor",		cmd_monitor,	0	},

tools/power/cpupower/utils/powercap-info.c new file +3 -0

new file mode 100644
index 000000000000..989fafe581cf
@@ -0,0 +1,113 @@
+#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>