tools/power turbostat: Extend --add option with perf counters

User can now read perf counters using "--add perf/<device>/<event>".
Other details work similarly to how --add works with MSRs.
Signed-off-by: Patryk Wlazlyn <patryk.wlazlyn@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

tools/power/x86/turbostat/Makefile

@@ -46,6 +46,7 @@ snapshot: turbostat
 	@echo "#define GENMASK_ULL(h, l) (((~0ULL) << (l)) & (~0ULL >> (sizeof(long long) * 8 - 1 - (h))))" >> $(SNAPSHOT)/bits.h
 
 	@echo '#define BUILD_BUG_ON(cond) do { enum { compile_time_check ## __COUNTER__ = 1/(!(cond)) }; } while (0)' > $(SNAPSHOT)/build_bug.h
+	@echo '#define __must_be_array(arr) 0' >> $(SNAPSHOT)/build_bug.h
 
 	@echo PWD=. > $(SNAPSHOT)/Makefile
 	@echo "CFLAGS +=	-DMSRHEADER='\"msr-index.h\"'" >> $(SNAPSHOT)/Makefile

tools/power/x86/turbostat/turbostat.8

@@ -28,10 +28,13 @@ name as necessary to disambiguate it from others is necessary.  Note that option
 .PP
 \fB--add attributes\fP add column with counter having specified 'attributes'.  The 'location' attribute is required, all others are optional.
 .nf
-	location: {\fBmsrDDD\fP | \fBmsr0xXXX\fP | \fB/sys/path...\fP}
+	location: {\fBmsrDDD\fP | \fBmsr0xXXX\fP | \fB/sys/path...\fP | \fBperf/<device>/<event>\fP}
 		msrDDD is a decimal offset, eg. msr16
 		msr0xXXX is a hex offset, eg. msr0x10
 		/sys/path... is an absolute path to a sysfs attribute
+		<device> is a perf device from /sys/bus/event_source/devices/<device> eg. cstate_core
+		<event> is a perf event for given device from /sys/bus/event_source/devices/<device>/events/<event> eg. c1-residency
+			perf/cstate_core/c1-residency would then use /sys/bus/event_source/devices/cstate_core/events/c1-residency
 
 	scope: {\fBcpu\fP | \fBcore\fP | \fBpackage\fP}
 		sample and print the counter for every cpu, core, or package.