cpufreq: add functions to get frequencies and governors for all online CPUs

This patch adds a couple of shutils functions to efficiently read all
the frequencies/governors and returne them into a dictionary indexed by
CPU id.

The shutils functions are returning a line per each CPU that can be easily
converted into a dictionary in the host side.

Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com>

devlib/bin/scripts/shutils.in

@@ -18,6 +18,11 @@ cpufreq_set_all_frequencies() {
 	done
 }
 
+cpufreq_get_all_frequencies() {
+	$GREP '' /sys/devices/system/cpu/cpu*/cpufreq/scaling_cur_freq | \
+		$SED -e 's|/sys/devices/system/cpu/cpu||' -e 's|/cpufreq/scaling_cur_freq:| |'
+}
+
 cpufreq_set_all_governors() {
 	GOV=$1
 	for CPU in /sys/devices/system/cpu/cpu[0-9]*; do
@@ -25,6 +30,11 @@ cpufreq_set_all_governors() {
 	done
 }
 
+cpufreq_get_all_governors() {
+	$GREP '' /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor | \
+		$SED -e 's|/sys/devices/system/cpu/cpu||' -e 's|/cpufreq/scaling_governor:| |'
+}
+
 cpufreq_trace_all_frequencies() {
 	FREQS=$(cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_cur_freq)
 	CPU=0; for F in $FREQS; do
@@ -41,9 +51,15 @@ case $CMD in
 cpufreq_set_all_frequencies)
     cpufreq_set_all_frequencies $*
     ;;
+cpufreq_get_all_frequencies)
+    cpufreq_get_all_frequencies
+    ;;
 cpufreq_set_all_governors)
     cpufreq_set_all_governors $*
     ;;
+cpufreq_get_all_governors)
+    cpufreq_get_all_governors
+    ;;
 cpufreq_trace_all_frequencies)
     cpufreq_trace_all_frequencies $*
     ;;

devlib/module/cpufreq.py

@@ -357,6 +357,19 @@ class CpufreqModule(Module):
                 'cpufreq_set_all_frequencies {}'.format(freq),
                 as_root=True)
 
+    def get_all_frequencies(self):
+        """
+        Get the current frequency for all the (online) CPUs
+        """
+        output = self.target._execute_util(
+                'cpufreq_get_all_frequencies', as_root=True)
+        frequencies = {}
+        for x in output.splitlines():
+            kv = x.split(' ')
+            if kv[0] == '':
+                break
+            frequencies[kv[0]] = kv[1]
+        return frequencies
 
     def set_all_governors(self, governor):
         """
@@ -366,6 +379,19 @@ class CpufreqModule(Module):
                 'cpufreq_set_all_governors {}'.format(governor),
                 as_root=True)
 
+    def get_all_governors(self):
+        """
+        Get the current governor for all the (online) CPUs
+        """
+        output = self.target._execute_util(
+                'cpufreq_get_all_governors', as_root=True)
+        governors = {}
+        for x in output.splitlines():
+            kv = x.split(' ')
+            if kv[0] == '':
+                break
+            governors[kv[0]] = kv[1]
+        return governors
 
     def trace_frequencies(self):
         """