Commit d672e47b authored Jun 29, 2021 by Chenfu.Liao Committed by Daren Liao Jul 02, 2021

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

parent 7d067aee

init/reboot.cpp

+14 −0

Original line number	Diff line number	Diff line
		@@ -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"