Federico Giovanardi 7fd45eec37 udev: add option to trigger parent devices despite filters ... This commit add the `-i` option to `udevadm trigger` that force it to match parent devices even if they're excluded from filters. The rationale is that some embedded devices have a huge number of platform devices ( ~ 4k for MX8 ) they are there because they're defined in the device tree but there isn't any action or udev rules associated with them. So at boot a significant time is spend triggering and processing rules for devices that don't produce any effect and we would like to filter them by calling: ``` udevadm trigger --type=device --action=add -s block -s tty ``` instead of the normal ``` udevadm trigger --type=device --action=add ``` so we can use filter to filter out only subsystems for we we know that we have rules in place that do something useful. On the other side action / rules are not triggered until the parent is triggered ( which is part of another subsystem), so the additional option will allows udev to complete the coldplug with only the devices we care. Example on iMX8: .Without the new option ``` root@dev:~# udevadm trigger --dry-run -s block --action=add -v /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0boot0 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0boot1 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0p1 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0p2 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0p3 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0p4 ``` .With the new option ``` root@dev:~# udevadm trigger --dry-run -i -s block --action=add -v /sys/devices/platform /sys/devices/platform/bus@5b000000 /sys/devices/platform/bus@5b000000/5b010000.mmc /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0boot0 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0boot1 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0p1 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0p2 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0p3 /sys/devices/platform/bus@5b000000/5b010000.mmc/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0p4 ``` Boot time reduction with this is place is ~ 1 second.		2024-12-16 15:43:52 +01:00
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bash	udev: add option to trigger parent devices despite filters	2024-12-16 15:43:52 +01:00
zsh	udev: add option to trigger parent devices despite filters	2024-12-16 15:43:52 +01:00