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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
…
LICENSE.LGPL2.1
…
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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CentOS CI - Arch
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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.

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