1 files changed, 45 insertions, 0 deletions
diff --git a/set_irq_affinity.sh b/set_irq_affinity.sh
new file mode 100755
index 0000000..fbf8fa4
--- /dev/null
+++ b/set_irq_affinity.sh
@@ -0,0 +1,45 @@
+#!/system/bin/sh
+
+# This script sets the default affinity to the processors with the given part id.
+#   - part id is in hex (as seen in /proc/cpuinfo)
+
+function build_mask_from_part_id {
+    local IFS
+    local mask
+    local ref_part_id
+
+    ref_part_id=$1
+    IFS=$'\n'
+
+    for line in `cat /proc/cpuinfo`
+    do
+        IFS=':'
+        set -A tokens $line
+
+        if [ "${line#'processor'}" != "$line" ]
+        then
+            cpu="${tokens[1]##' '}"
+        elif [ "${line#'CPU part'}" != "$line" ]
+        then
+            part_id="${tokens[1]##' '}"
+
+            if [ "$part_id" == "$ref_part_id" ]
+            then
+                (( mask |= 1 << $cpu ))
+            fi
+        fi
+    done
+    echo $(printf "%x" $mask)
+}
+
+ref_part_id=$(echo $1 | tr '[A-Z]' '[a-z]')
+mask=$(build_mask_from_part_id $ref_part_id)
+[ -z "$mask" ] && exit
+
+echo $mask > /proc/irq/default_smp_affinity
+
+for i in `ls /proc/irq`
+do
+    affinity_file="/proc/irq/$i/smp_affinity"
+    [ -e $affinity_file ] && echo $mask > $affinity_file
+done