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The systemd System and Service Manager
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Marek Vasut f80b7d1a89 udev: Handle AMBA bus the same way as generic platform bus 
On various ARM systems, it is possible to find devices on AMBA bus.
This is defined in Linux kernel drivers/amba/bus.c as separate bus
type. Udev currently does not recognize this when building ID_PATH
which leads to ID_PATH containing the suffix from next recognized
parent device. On ST STM32MP15xx with SDIO WiFi, the ID_PATH looks
like 'platform-soc', which is not unique and basically useless. On
NXP i.MX8M Plus with SDIO WiFi, ID_PATH is 'platform-30b40000.mmc'
which is far more useful.

Add the 'amba' subsystem handling the same way 'platform' subsystem
is handled to get ID_PATH 'platform-soc-amba-48004000.sdmmc' on the
former, which is far more useful compared to 'platform-soc'.

---

```
$ udevadm info --attribute-walk --path=/devices/platform/soc/48004000.mmc/mmc_host/mmc1/mmc1:0001/mmc1:0001:1/net/wlan0

Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

  looking at device '/devices/platform/soc/48004000.mmc/mmc_host/mmc1/mmc1:0001/mmc1:0001:1/net/wlan0':
    KERNEL=="wlan0"
    SUBSYSTEM=="net"
    DRIVER==""
    ATTR{addr_assign_type}=="0"
    ATTR{addr_len}=="6"
    ATTR{address}=="10:98:c3:5f:4b:80"
    ATTR{broadcast}=="ff:ff:ff:ff:ff:ff"
    ATTR{carrier_changes}=="1"
    ATTR{carrier_down_count}=="1"
    ATTR{carrier_up_count}=="0"
    ATTR{dev_id}=="0x0"
    ATTR{dev_port}=="0"
    ATTR{flags}=="0x1002"
    ATTR{gro_flush_timeout}=="0"
    ATTR{ifalias}==""
    ATTR{ifindex}=="3"
    ATTR{iflink}=="3"
    ATTR{link_mode}=="0"
    ATTR{mtu}=="1500"
    ATTR{napi_defer_hard_irqs}=="0"
    ATTR{netdev_group}=="0"
    ATTR{operstate}=="down"
    ATTR{power/control}=="auto"
    ATTR{power/runtime_active_time}=="0"
    ATTR{power/runtime_status}=="unsupported"
    ATTR{power/runtime_suspended_time}=="0"
    ATTR{proto_down}=="0"
    ATTR{queues/rx-0/rps_cpus}=="0"
    ATTR{queues/rx-0/rps_flow_cnt}=="0"
    ATTR{queues/tx-0/byte_queue_limits/hold_time}=="1000"
    ATTR{queues/tx-0/byte_queue_limits/inflight}=="0"
    ATTR{queues/tx-0/byte_queue_limits/limit}=="0"
    ATTR{queues/tx-0/byte_queue_limits/limit_max}=="1879048192"
    ATTR{queues/tx-0/byte_queue_limits/limit_min}=="0"
    ATTR{queues/tx-0/tx_maxrate}=="0"
    ATTR{queues/tx-0/tx_timeout}=="0"
    ATTR{queues/tx-0/xps_rxqs}=="0"
    ATTR{statistics/collisions}=="0"
    ATTR{statistics/multicast}=="0"
    ATTR{statistics/rx_bytes}=="0"
    ATTR{statistics/rx_compressed}=="0"
    ATTR{statistics/rx_crc_errors}=="0"
    ATTR{statistics/rx_dropped}=="0"
    ATTR{statistics/rx_errors}=="0"
    ATTR{statistics/rx_fifo_errors}=="0"
    ATTR{statistics/rx_frame_errors}=="0"
    ATTR{statistics/rx_length_errors}=="0"
    ATTR{statistics/rx_missed_errors}=="0"
    ATTR{statistics/rx_nohandler}=="0"
    ATTR{statistics/rx_over_errors}=="0"
    ATTR{statistics/rx_packets}=="0"
    ATTR{statistics/tx_aborted_errors}=="0"
    ATTR{statistics/tx_bytes}=="0"
    ATTR{statistics/tx_carrier_errors}=="0"
    ATTR{statistics/tx_compressed}=="0"
    ATTR{statistics/tx_dropped}=="0"
    ATTR{statistics/tx_errors}=="0"
    ATTR{statistics/tx_fifo_errors}=="0"
    ATTR{statistics/tx_heartbeat_errors}=="0"
    ATTR{statistics/tx_packets}=="0"
    ATTR{statistics/tx_window_errors}=="0"
    ATTR{threaded}=="0"
    ATTR{tx_queue_len}=="1000"
    ATTR{type}=="1"

  looking at parent device '/devices/platform/soc/48004000.mmc/mmc_host/mmc1/mmc1:0001/mmc1:0001:1':
    KERNELS=="mmc1:0001:1"
    SUBSYSTEMS=="sdio"
    DRIVERS=="brcmfmac"
    ATTRS{class}=="0x00"
    ATTRS{coredump}=="(write-only)"
    ATTRS{device}=="0xa9bf"
    ATTRS{power/control}=="auto"
    ATTRS{power/runtime_active_time}=="0"
    ATTRS{power/runtime_status}=="unsupported"
    ATTRS{power/runtime_suspended_time}=="0"
    ATTRS{revision}=="0.0"
    ATTRS{vendor}=="0x02d0"

  looking at parent device '/devices/platform/soc/48004000.mmc/mmc_host/mmc1/mmc1:0001':
    KERNELS=="mmc1:0001"
    SUBSYSTEMS=="mmc"
    DRIVERS==""
    ATTRS{device}=="0xa9bf"
    ATTRS{ocr}=="0x00200000"
    ATTRS{power/control}=="auto"
    ATTRS{power/runtime_active_time}=="0"
    ATTRS{power/runtime_status}=="unsupported"
    ATTRS{power/runtime_suspended_time}=="0"
    ATTRS{rca}=="0x0001"
    ATTRS{revision}=="0.0"
    ATTRS{type}=="SDIO"
    ATTRS{vendor}=="0x02d0"

  looking at parent device '/devices/platform/soc/48004000.mmc/mmc_host/mmc1':
    KERNELS=="mmc1"
    SUBSYSTEMS=="mmc_host"
    DRIVERS==""
    ATTRS{power/control}=="auto"
    ATTRS{power/runtime_active_time}=="0"
    ATTRS{power/runtime_status}=="unsupported"
    ATTRS{power/runtime_suspended_time}=="0"

  looking at parent device '/devices/platform/soc/48004000.mmc':
    KERNELS=="48004000.mmc"
    SUBSYSTEMS=="amba" <------------------------------------------------------- AMBA is here
    DRIVERS=="mmci-pl18x"
    ATTRS{driver_override}=="(null)"
    ATTRS{id}=="00253180"
    ATTRS{power/autosuspend_delay_ms}=="50"
    ATTRS{power/control}=="on"
    ATTRS{power/runtime_active_time}=="666709"
    ATTRS{power/runtime_status}=="active"
    ATTRS{power/runtime_suspended_time}=="0"

  looking at parent device '/devices/platform/soc':
    KERNELS=="soc"
    SUBSYSTEMS=="platform"
    DRIVERS=="simple-pm-bus"
    ATTRS{driver_override}=="(null)"
    ATTRS{power/control}=="auto"
    ATTRS{power/runtime_active_time}=="0"
    ATTRS{power/runtime_status}=="unsupported"
    ATTRS{power/runtime_suspended_time}=="0"

  looking at parent device '/devices/platform':
    KERNELS=="platform"
    SUBSYSTEMS==""
    DRIVERS==""
    ATTRS{power/control}=="auto"
    ATTRS{power/runtime_active_time}=="0"
    ATTRS{power/runtime_status}=="unsupported"
    ATTRS{power/runtime_suspended_time}=="0"
```
2022-10-31 21:12:12 +01:00
.clusterfuzzlite ci: unpin CFLite 2022-04-26 09:13:57 +00:00
.github Disable code freeze banner 2022-10-31 18:57:13 +00:00
.semaphore semaphore: run autopkgtest with sudo 2022-08-11 13:36:15 +02:00
catalog man: reword some awkward sentences 2022-10-14 15:56:58 +02:00
coccinelle basic/list: drop LIST_IS_EMPTY 2022-07-02 12:46:16 +02:00
docs docs/HACKING.md: clarify some portions 2022-10-31 20:56:37 +01:00
factory meson: also allow setting GIT_VERSION via templates 2022-04-05 22:18:31 +02:00
hwdb.d Update hwdb 2022-10-31 12:15:16 +00:00
LICENSES network: change license of examples to MIT-0 2022-10-26 08:39:34 +02:00
man sd-bus: convenience functions to emit a signal to a destination (#25123) 2022-10-31 20:11:48 +00:00
mkosi.default.d mkosi: libbpf0 -> libbpf1 2022-10-24 20:40:07 +02:00
modprobe.d meson: install the right README file in modprobe.d 2021-07-07 14:52:05 +02:00
network network: change license of examples to MIT-0 2022-10-26 08:39:34 +02:00
po po: Translated using Weblate (Chinese (Simplified) (zh_CN)) 2022-10-31 12:54:01 +01:00
presets units: enable systemd-network-generator by default 2021-12-16 09:49:39 +01:00
rules.d udev: always create device symlinks for USB disks 2022-10-30 12:02:02 +01:00
shell-completion dissect: add --list option 2022-10-31 21:11:09 +01:00
src udev: Handle AMBA bus the same way as generic platform bus 2022-10-31 21:12:12 +01:00
sysctl.d tree-wide: link to docs.kernel.org for kernel documentation 2022-07-04 19:56:53 +02:00
sysusers.d Use descriptive name for nobody 2022-05-27 22:09:24 +01:00
test Merge pull request #24958 from Werkov/meson-generated-directives 2022-10-31 21:04:30 +01:00
tmpfiles.d Remove duplicated word 2022-10-29 14:19:43 +09:00
tools Merge pull request #24958 from Werkov/meson-generated-directives 2022-10-31 21:04:30 +01:00
units unit: also prioritize input devices when triggering devices 2022-10-26 10:49:09 +02:00
xorg xorg/50-systemd-user: add a full license header 2021-10-01 14:45:00 +02:00
.clang-format clang-format: Adjust style of pointers 2022-05-30 04:00:54 +09:00
.ctags editors: Prevent ctags from following symlinks 2019-02-15 11:01:20 -08:00
.dir-locals.el scripts: use 4 space indentation 2019-04-12 08:30:31 +02:00
.editorconfig docs: configure editorconfig for css and html 2022-05-17 21:13:17 +02:00
.gitattributes gitattributes: introduce and use "generated" attribute 2021-10-18 09:42:55 +02:00
.gitignore core/cgroup: CPUWeight/CPUShares support idle input 2022-08-11 14:25:58 +02:00
.mailmap mailmap: two more names 2021-03-30 13:17:58 +02:00
.packit.yml Packit: build SRPMs in Copr 2022-03-09 09:52:41 +00:00
.vimrc scripts: use 4 space indentation 2019-04-12 08:30:31 +02:00
.ycm_extra_conf.py ycm: add doc string for all the functions in configuration file 2017-11-29 13:21:49 -07:00
configure tools: shellcheck-ify tool scripts 2021-09-30 12:27:06 +02:00
LICENSE.GPL2 relicense to LGPLv2.1 (with exceptions) 2012-04-12 00:24:39 +02:00
LICENSE.LGPL2.1 licence: remove references to old FSF address 2012-12-17 11:41:31 +01:00
Makefile tree-wide: add spdx header on all scripts and helpers 2021-01-28 09:55:35 +01:00
meson_options.txt core: allow disabling system time correction if rtc returns time far in the future 2022-08-24 21:39:46 +01:00
meson.build Merge pull request #24958 from Werkov/meson-generated-directives 2022-10-31 21:04:30 +01:00
mkosi.build mkosi: Make sure bpf-framework works on CentOS Stream 8 as well 2022-10-17 08:45:48 +02:00
mkosi.postinst mkosi: Ensure we build all features/components in mkosi 2022-08-23 15:19:26 +02:00
NEWS Finalise 👻 SpOoOky 👻 NEWS for v252 2022-10-31 18:59:18 +00:00
README README: Fix libbpf minimum version 2022-10-17 08:45:16 +02:00
README.md README.md: add a missing line break 2022-10-19 11:17:33 +02:00
TODO update TODO 2022-10-31 12:38:48 +01:00

README.md

Systemd

System and Service Manager

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Details

Most documentation is available on systemd's web site.

Assorted, older, general information about systemd can be found in the systemd Wiki.

Information about build requirements is provided in the README file.

Consult our NEWS file for information about what's new in the most recent systemd versions.

Please see the Code Map for information about this repository's layout and content.

Please see the Hacking guide for information on how to hack on systemd and test your modifications.

Please see our Contribution Guidelines for more information about filing GitHub Issues and posting GitHub Pull Requests.

When preparing patches for systemd, please follow our Coding Style Guidelines.

If you are looking for support, please contact our mailing list or join our IRC channel.

Stable branches with backported patches are available in the stable repo.