From 0184b772a92ce1cd5e0f51b80b1bca9d06c04c3d Mon Sep 17 00:00:00 2001
From: Woody Lin <woodylin@google.com>
Date: Mon, 4 Sep 2023 09:58:01 +0800
Subject: [PATCH] init.debug.rc: enable etm/etm2dram when SJTAG is unlocked

Enables the debug features required an unlocked SJTAG to the section
`on property:ro.vendor.sjtag_ap_is_unlocked=true`, so they can be
enabled when 1. PD is available on non-fused device on boot, or 2. PD is
available after betterbug acquires it from the corp service.

Bug: 299043634
Change-Id: I43f8364d7624af1d98b79afffeb1c6dc8bb6faf0
---
 conf/init.check_ap_pd_auth.sh | 15 +++++++++++++++
 conf/init.debug.rc            | 11 +++++++++++
 device.mk                     |  3 ++-
 3 files changed, 28 insertions(+), 1 deletion(-)
 create mode 100644 conf/init.check_ap_pd_auth.sh

diff --git a/conf/init.check_ap_pd_auth.sh b/conf/init.check_ap_pd_auth.sh
new file mode 100644
index 00000000..8175e754
--- /dev/null
+++ b/conf/init.check_ap_pd_auth.sh
@@ -0,0 +1,15 @@
+#!/vendor/bin/sh
+
+# This script sets up `ro.vendor.sjtag_ap_is_unlocked` for the non-fused
+# device. For a fused device, this property should be set by
+# betterbug->ss-restart-detector when PD is acquired.
+
+SJTAG_STATUS=0x$(cat /sys/devices/platform/sjtag_ap/interface/status)
+SOFT_LOCK_BIT=4
+AUTH_PASS_BIT=8
+
+# Unlocked or locked but auth passed.
+if test "$((SJTAG_STATUS & (1 << SOFT_LOCK_BIT)))" = 0 -o \
+    "$((SJTAG_STATUS & (1 << AUTH_PASS_BIT)))" != 0 ; then
+  setprop ro.vendor.sjtag_ap_is_unlocked true
+fi
diff --git a/conf/init.debug.rc b/conf/init.debug.rc
index 019a514b..f86f224b 100644
--- a/conf/init.debug.rc
+++ b/conf/init.debug.rc
@@ -50,3 +50,14 @@ on property:persist.sys.device_provisioned=1 && property:ro.revision=PROTO1.1
     start vendor.force_pkvm
 on property:persist.sys.device_provisioned=1 && property:ro.revision=EVT1.0
     start vendor.force_pkvm
+
+service vendor.check_ap_pd_auth_sh /vendor/bin/init.check_ap_pd_auth.sh
+    class main
+    user root
+    group root system
+    oneshot
+
+# Enable etm/etm2dram when ramdump is enabled, and ap-sjtag is unlocked.
+on property:ro.boot.ramdump=enabled && property:ro.vendor.sjtag_ap_is_unlocked=true
+    write /sys/devices/platform/exynos-etm/etm_on 1
+    write /sys/devices/platform/etm2dram/arm 1
diff --git a/device.mk b/device.mk
index e5920921..08e9ea1b 100644
--- a/device.mk
+++ b/device.mk
@@ -338,7 +338,8 @@ PRODUCT_COPY_FILES += \
 
 ifneq (,$(filter userdebug eng, $(TARGET_BUILD_VARIANT)))
 PRODUCT_COPY_FILES += \
-	device/google/zuma/conf/init.debug.rc:$(TARGET_COPY_OUT_VENDOR)/etc/init/init.debug.rc
+	device/google/zuma/conf/init.debug.rc:$(TARGET_COPY_OUT_VENDOR)/etc/init/init.debug.rc \
+	device/google/zuma/conf/init.check_ap_pd_auth.sh:$(TARGET_COPY_OUT_VENDOR)/bin/init.check_ap_pd_auth.sh
 PRODUCT_COPY_FILES += \
 	device/google/zuma/conf/init.freq.userdebug.rc:$(TARGET_COPY_OUT_VENDOR)/etc/init/init.freq.userdebug.rc
 endif