From d672e47b32128978637c5e96272b9d77d3f3ce29 Mon Sep 17 00:00:00 2001
From: "Chenfu.Liao" <chenfu.liao@mediatek.com>
Date: Tue, 29 Jun 2021 15:41:22 +0800
Subject: [PATCH] Add Quiescent Reboot Target

[Description]
In the Quiescent Reboot process,
the android init process will pass the reboot target name "quiescent"
to the kernel through reboot syscall.

Kernel will write the boot-quiescent flag
to the misc partition to notify the bootloader.

When rebooting, bootloader will be added to
bootargs androidboot.quiescent=1 to notify android .

In the new version of GKI,
the filp_open function is not allowed
so that it is impossible to write the quiescent flag
in the Kernel to the misc partition.

https://android-review.googlesource.com/c/kernel/common/+/1705108
/1..29/android/abi_gki_aarch64_mtk#b641

Bug: 192634025

Test:
adb reboot quiescent
adb shell setprop sys.powerctl reboot,quiescent

Change-Id: I5ac982a1f16df39fa6bf567729a18ca8225f21f2
---
 init/reboot.cpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/init/reboot.cpp b/init/reboot.cpp
index 0e788e495..c5f1ee4ff 100644
--- a/init/reboot.cpp
+++ b/init/reboot.cpp
@@ -1035,6 +1035,20 @@ void HandlePowerctlMessage(const std::string& command) {
                         return;
                     }
                 }
+            } else if (reboot_target == "quiescent") {
+                bootloader_message boot = {};
+                if (std::string err; !read_bootloader_message(&boot, &err)) {
+                    LOG(ERROR) << "Failed to read bootloader message: " << err;
+                }
+                // Update the boot command field if it's empty, and preserve
+                // the other arguments in the bootloader message.
+                if (!CommandIsPresent(&boot)) {
+                    strlcpy(boot.command, "boot-quiescent", sizeof(boot.command));
+                    if (std::string err; !write_bootloader_message(boot, &err)) {
+                        LOG(ERROR) << "Failed to set bootloader message: " << err;
+                        return;
+                    }
+                }
             } else if (reboot_target == "sideload" || reboot_target == "sideload-auto-reboot" ||
                        reboot_target == "fastboot") {
                 std::string arg = reboot_target == "sideload-auto-reboot" ? "sideload_auto_reboot"