sapphire: rootdir: Dynamically set IRQ affinity for KGSL and MSM_DRM

- Introduce a new shell script to set IRQ affinity, since different
  kernels can have different IRQ numbers.

Change-Id: I61d2350e6b40f096714148c568489579bc4d2371
Co-Authored-By: Alex Naidis <alex.naidis@paranoidandroid.co>
Co-Authored-By: Jake Weinstein <jake@aospa.co>

device.mk

@@ -318,6 +318,7 @@ PRODUCT_PACKAGES += \
     init.qti.early_init.sh \
     init.qti.kernel.sh \
     init.qti.write.sh \
+    init.sapphire_perf.sh \
     system_dlkm_modprobe.sh \
     vendor_modprobe.sh
 

rootdir/Android.bp

@@ -74,6 +74,12 @@ sh_binary {
     vendor: true,
 }
 
+sh_binary {
+    name: "init.sapphire_perf.sh",
+    src: "bin/init.sapphire_perf.sh",
+    vendor: true,
+}
+
 sh_binary {
     name: "init.kernel.post_boot-bengal.sh",
     src: "bin/init.kernel.post_boot-bengal.sh",

rootdir/bin/init.sapphire_perf.sh

@@ -0,0 +1,25 @@
+#!/vendor/bin/sh
+#
+# Copyright (C) 2024 Paranoid Android
+# SPDX-License-Identifier: Apache-2.0
+#
+
+function write_irq_affinity() {
+    # Arguments:
+    # $1 = irq name
+    # $2 = cpu id
+    irq_dir="$(dirname /proc/irq/*/$1)"
+    [ -d "$irq_dir" ] && echo $2 > "${irq_dir}/smp_affinity_list"
+}
+
+# IRQ Tuning
+# kgsl_3d0_irq -> CPU 1
+# msm_drm -> CPU 2
+write_irq_affinity kgsl_3d0_irq 1
+write_irq_affinity msm_drm 2
+
+# IRQ Tuning for pre-5.4 targets
+write_irq_affinity kgsl-3d0 1
+
+# IRQ Tuning for MDSS targets
+write_irq_affinity MDSS 2

rootdir/etc/init.sapphire.perf.rc

@@ -6,6 +6,8 @@ on property:sys.boot_completed=1
     copy_per_line /dev/cpuctl/tasks /dev/cpuctl/system/tasks
 
 on property:vendor.post_boot.parsed=1
+    exec u:r:vendor_qti_init_shell:s0 -- /vendor/bin/init.sapphire_perf.sh
+
     # cpuset parameters
     write /dev/cpuset/background/cpus 0-1
     write /dev/cpuset/system-background/cpus 0-3

sepolicy/vendor/file_contexts

@@ -27,6 +27,9 @@
 # Health
 /vendor/bin/hw/android\.hardware\.health-service\.xiaomi                              u:object_r:hal_health_default_exec:s0
 
+# Init
+/(vendor|system/vendor)/bin/init\.sapphire_perf\.sh u:object_r:vendor_qti_init_shell_exec:s0
+
 # Mac Address
 /data/vendor/mac_addr(/.*)? u:object_r:vendor_mac_vendor_data_file:s0
 /vendor/bin/nv_mac u:object_r:vendor_wcnss_service_exec:s0

sepolicy/vendor/vendor_qti_init_shell.te

@@ -1,3 +1,5 @@
+allow vendor_qti_init_shell proc:dir r_dir_perms;
+allow vendor_qti_init_shell proc:file rw_file_perms;
 allow vendor_qti_init_shell configfs:dir { add_name create write };
 # NECESSARY?
 allow vendor_qti_init_shell configfs:dir setattr;