Tizen Bootup. Xiaoli Gong Nankai University, China

Transcription

1 Tizen Bootup Xiaoli Gong Nankai University, China

2 Tizen logical layers OSP(Open Services Platform, C++ APIs)

3 Tizen physical partitions Storage partitions

4 Tizen filesystems

5 File system is a user interface 5

6 Mount point 6

7 Write file system into partitions

8 Write file system into partitions

9 Write file system into partitions

10 How system know file systems In u-boot source code, root file system type is specified: include/configs/tizen.h 10

11 Root file system mounted by kernel Call stack init/main.c kernel_init_freeable init/do_mounts.c init/do_mounts.c prepare_namespace mount_root_block In this function, the argument root, rootfstype are recognized,and call do_mount_root to mount the root

12 Create the first process Kernel source : init/main.c kernel_init 12

13 User space prepare for init The first process with task id 1 Root of the process tree Take over the orphan process Power off the system

14 What s in /sbin/init 14

15 systemd

16 What is systemd? Sysvinit userspace launch (PID 1) Only one process at a time running Simply starting the system and then going to sleep until the next reboot Systemd Default init in Fedora 15 and later Leonard Poettering (2009) improve the software framework for expressing dependencies allow more processing to be done concurrently or in parallel during system booting reduce the computational overhead of the shell.

17 Platform bootup entry point.target vs.service.target; service grouping.service; process run

18 Parsing unit file example (8/8) User awareness unit name = System Initialization If emergency is running, wait Run with local-fs.target, swap.target, sysinit.target.wants Run after local-fs.target, swap.target, emergency.service, emergency.target User can control service start and stop

19 local-fs.target /usr/lib/systemd/system/local-fs.target.wants opt.mount [Mount] What=/dev/mmcblk0p6 Where=/opt Type=ext4 Options=defaults

20 Systemd other features Demo

21 What is systemd? Systemd in Tizen System and service manager for tizen systemd Ver. 43 (download Parallelizes service execution Socket and D-Bus activation for starting services and daemon on-demand starting of daemons Managing the service processes as a group using Linux cgroup Supporting automount points Snapshotting and restoring of services

22 systemd architecture

23 systemd architecture systemd Utility monitoring and controlling systemd itself and its services 'systemctl' developers can query or send control commend to the systemd service manager 'systemd-journalctl' utility to see log message systemd target Tizen boot-up process is split up in various discrete steps and each step are grouped its unit using 'Target' unit to synchronize point The boot-up process is highly parallelized in each target so that the order in which specific target units are reached in not deterministic systemd daemon system and service manager for Tizen platform acts as init system 'systemd' daemonruns as user session with '--user' option 'systemd-journald' is a system service that collects and stores log data from the Kernel, from user processes via syslog or STDOUT/STDERR

24 systemd architecture systemd core manages all units such as service, socket, mount and so on, stores all log data. controlled by using systemd utility like 'systemctl' systemd library & Linux Kernel systemd requires to enable 'cgroup' and 'autofs' option in Kernel configuration It also depends on dbus and some libraries such as libnotify, libudev

25 Platform bootup sysinit.target Early boot-up scripts Most of file system are mounted and systemd related daemons are launched Kernel sysinit.target basic.target bootmode.target multi-user.target graphical.target dev-hugepages.mount dev-mqueue.mount proc-sys-fsbinfmt_misc.automount sys-fs-fuse-connections.mount sys-kernel-config.mount sys-kernel-debug.mount sys-kernel-security.mount systemd-ask-passwordconsole.path systemd-binfmt.service systemd-journald.service systemd-modules-load.service systemd-random-seedload.service systemd-readahead-collect.service systemd-readahead-replay.service systemd-sysctl.service systemd-tmpfiles-setup.service swap.target local-fs.target -.mount boot.mount csa.mount fsck-root.service media.mount opt-usr.mount opt.mount remount-rootfs.service resize2fs-root.service systemd-remount-api-vfs.service var-run.mount socket.target dbus.socket systemd-initctl.socket systemd-journald.socket systemd-shutdownd.socket telnetd.socket udev-control.socket udev-kernel.socket

26 Platform bootup basic.target Basic boot-up All necessary initialization for general purpose daemons are completed Kernel sysinit.target basic.target bootmode.target multi-user.target graphical.target opt-var-kdb-db-libsqlfs.service opt-var-kdb-db-smack-labels.service smack-default-labeling.service systemd-tmpfiles-clean.timer tizen-debug-level.service udev-trigger.service udev.service vconf-setup.service

27 Platform bootup bootmote.target Select boot mode If kernel boot parameter has charger_detect_boot, the platform boots up as charging mode Kernel sysinit.target basic.target bootmode.target multi-user.target graphical.target bootmode-charging.service bootmode-graphical.service

28 Platform bootup multi-user.target Setup a multi-user system which is non-graphical support Launching platform infrastructure daemons (such as dbus, power manager, gps manager, telephony daemon, WRT security daemon, media server, systemd-related daemons) Kernel sysinit.target basic.target bootmode.target multi-user.target graphical.target alarm-server.service avsystem.service bluetooth-address.service bluetooth-frwk-service.service bluetooth.service dbus.service dlog-main.service dlog-radio.service getty.target gps-manager.service media-server.service nfc-manager.service power-manager.service pulseaudio.service secure-storage.service sensor-framework.service system-server.service systemd-ask-password-wall.path systemd-logind.service systemd-user-sessions.service telephony.service

29 Platform bootup graphical.target Setup a graphical environment System user session for app privilege daemons such as Enlightenment (window manager) Special target for middleware & mobile service Kernel sysinit.target basic.target bootmode.target multi-user.target graphical.target ac.service launchpad-reload@app.service user-session@app.service wrt_launchpad_daemon@app.service xorg.service xorg.target core-efl.target boot-animation.service cbhm.service e17.service indicator.service osp-app-service.service quickpanel.service scim.service starter.path xmodmap.service xrdb.service tizen-mobile-session.target wrt-preinstall-widgets.service tizen-middleware.target calendar.service contacts-service.service download-provider.service .service msg-service.service pushd.service sound-server.service

30 Systemd parsing

31 Platform bootup systemd Control is moved from initramfs to systemd of Tizen platform Run hardware init and fs mount, etc services Bootup process run several units (.target) Different target can be run in parallel Many linux distributions adopt systemd as default Red Hat Enterprise Linux, CentOS, Fedora, Arch Linux, opensuse Do not use daemon control script (/sbin/init, /etc/init.d/*, /etc/rc*.d) /usr/lib/systemd unit files: service, target, socket, device, mount, automount, path, snapshot, swap, timer systemd utilities: systemctl, notify, analyze, cgis, cgtop, logictl, journalctl, nspawn

32 Parsing unit file example (1/8) /usr/lib/systemd/system target to parse cat sysinit.target

33 Parsing unit file example (2/8) Website systemd download manpage

34 Parsing unit file example (3/8) Can search all function and unit, configuration of systemd enter target index

35 Parsing unit file example (4/8) target unit file

36 Parsing unit file example (5/8) Description on unit file option

37 Parsing unit file example (6/8)

38 Parsing unit file example (7/8)

39 Parsing unit file example (8/8) User awareness unit name = System Initialization If emergency is running, wait Run with local-fs.target, swap.target, sysinit.target.wants Run after local-fs.target, swap.target, emergency.service, emergency.target User can control service start and stop

40 Different Sessions [Unit], [Service], [Install], [Socket], [Swap], [Mount], example; telephony.service [Unit]; general options unit name = Telephony daemon Run after modem.service [Service]; process options Run telephony-daemon as main process [Install]; actual work of unit excute Create telephony.service symlink at multi-user.target.wants

41 References systemd official Site systemd FAQ (written by developer)

42 Homework Finish porting Tizen to Odroid-U3 Submit a report about your porting procedure Reference for troubleshooting

43 Acknowledgement This project is partially sponsored by Tianjin Samsung Electronics Co., Ltd. Special thanks to SKKU Embedded Software Laboratory. This material is based on the lecture provided by them, and the credit goes to the original authors.