Initial commit

target/linux/qualcommax/ipq807x/base-files/etc/init.d/smp_affinity

@@ -0,0 +1,122 @@
+#!/bin/sh /etc/rc.common
+######################################################################
+# vim: set ft=bash
+# shellcheck disable=2155,3019,3043,3057,3060
+######################################################################
+
+START=93
+
+PROG=smp_affinity
+
+log_msg() {
+
+  local irq_name="$1" affinity="$2" irq="$3"
+
+  msg="$(printf "Pinning IRQ($irq) %-24s to CPU ${affinity}\n" "$irq_name")"
+
+  logger -t "$PROG" "$msg"
+}
+
+######################################################################
+### Takes a comma, space separated, or range list of CPU numbers and
+## returns a bitmask of CPUs.
+## cpus_to_bitmask "0,1,2,3" -> f
+## cpus_to_bitmask "0 1 2 3" -> f
+## cpus_to_bitmask "0-3"     -> f
+## cpus_to_bitmask "3"       -> 8
+#######################################################################
+
+cpus_to_bitmask() {
+
+  local bitmask=0
+  # shellcheck disable=2048
+  for range in ${*//,/ }; do
+    start="${range%-*}"
+    end="${range#*-}"
+    if [ -z "$end" ]; then
+      bitmask="$((bitmask | 1 << start))"
+    else
+      bitmask="$((bitmask | (2 ** (end - start + 1) - 1) << start))"
+    fi
+  done
+  printf '%x' $bitmask
+}
+
+######################################################################
+### Takes a bitmask of CPUs and returns a space separated list of
+## CPU numbers.
+## bitmask_to_cpus f -> 0 1 2 3
+######################################################################
+
+bitmask_to_cpus() {
+
+  [ "${1:0:2}" != "0x" ] && set -- "0x$1"
+  local bitmask="$(printf '%d' "$1")"
+
+  local cpus=""
+  for i in $(seq 0 63); do
+    if [ $((bitmask & 1)) -ne 0 ]; then
+      cpus="$cpus $i"
+    fi
+    bitmask=$((bitmask >> 1))
+  done
+  echo "${cpus# }"
+}
+
+######################################################################
+### Sets the affinity of the IRQs with the given name to the given CPU.
+## 1st argument: IRQ name ("reo2host-destination-ring1") (req)
+## 2nd argument: CPU number (req)
+######################################################################
+
+set_affinity() {
+
+  local irq_name="$1" affinity="$2" bitmask irq
+  awk -v irq_name="$1" '$0 ~ irq_name { print substr($1, 1, length($1)-1); exit }' /proc/interrupts \
+    | while read -r irq; do
+      $enable_log && {
+        log_msg "$irq_name" "$affinity" "$irq"
+      }
+      bitmask=$(cpus_to_bitmask "$affinity") && echo "$bitmask" > "/proc/irq/$irq/smp_affinity"
+    done
+}
+
+enable_affinity_ipq807x() {
+
+  # assign 4 rx interrupts to each core
+  set_affinity 'reo2host-destination-ring1'    0
+  set_affinity 'reo2host-destination-ring2'    1
+  set_affinity 'reo2host-destination-ring3'    2
+  set_affinity 'reo2host-destination-ring4'    3
+
+  # assign 3 tcl completions to last 3 CPUs
+  set_affinity 'wbm2host-tx-completions-ring1' 1
+  set_affinity 'wbm2host-tx-completions-ring2' 2
+  set_affinity 'wbm2host-tx-completions-ring3' 3
+
+  # assign 3 ppdu mac interrupts to last 3 cores
+  set_affinity 'ppdu-end-interrupts-mac1'      1
+  set_affinity 'ppdu-end-interrupts-mac2'      2
+  set_affinity 'ppdu-end-interrupts-mac3'      3
+
+  # assign 4 lan/wan to core 4
+  set_affinity 'edma_txcmpl'                   3
+  set_affinity 'edma_rxfill'                   3
+  set_affinity 'edma_rxdesc'                   3
+  set_affinity 'edma_misc'                     3
+}
+
+boot() {
+
+  local enable
+
+  config_load     smp_affinity
+
+  config_get_bool enable     "general" enable     1
+  config_get_bool enable_log "general" enable_log 1
+
+  [ "$enable"     -eq 1 ] && enable=true     || enable=false
+  [ "$enable_log" -eq 1 ] && enable_log=true || enable_log=false
+
+  $enable && enable_affinity_ipq807x
+}