This series is based on linux-next + these 2 small patches applies on top: https://lore.kernel.org/lkml/20220526034609.480766-1-sarava...@google.com/
A lot of the deferred_probe_timeout logic is redundant with fw_devlink=on. Also, enabling deferred_probe_timeout by default breaks a few cases. This series tries to delete the redundant logic, simplify the frameworks that use driver_deferred_probe_check_state(), enable deferred_probe_timeout=10 by default, and fixes the nfsroot failure case. The overall idea of this series is to replace the global behavior of driver_deferred_probe_check_state() where all devices give up waiting on supplier at the same time with a more granular behavior: 1. Devices with all their suppliers successfully probed by late_initcall probe as usual and avoid unnecessary deferred probe attempts. 2. At or after late_initcall, in cases where boot would break because of fw_devlink=on being strict about the ordering, we a. Temporarily relax the enforcement to probe any unprobed devices that can probe successfully in the current state of the system. For example, when we boot with a NFS rootfs and no network device has probed. b. Go back to enforcing the ordering for any devices that haven't probed. 3. After deferred probe timeout expires, we permanently give up waiting on supplier devices without drivers. At this point, whatever devices can probe without some of their optional suppliers end up probing. In the case where module support is disabled, it's fairly straightforward and all device probes are completed before the initcalls are done. Patches 1 to 3 are fairly straightforward and can probably be applied right away. Patches 4 to 6 are for fixing the NFS rootfs issue and setting the default deferred_probe_timeout back to 10 seconds when modules are enabled. Patches 7 to 9 are further clean up of the deferred_probe_timeout logic so that no framework has to know/care about deferred_probe_timeout. Yoshihiro/Geert, If you can test this patch series and confirm that the NFS root case works, I'd really appreciate that. Thanks, Saravana v1 -> v2: Rewrote the NFS rootfs fix to be a lot less destructive on the fw_devlink ordering for devices that don't end up probing during the "best effort" attempt at probing all devices needed for a network rootfs Saravana Kannan (9): PM: domains: Delete usage of driver_deferred_probe_check_state() pinctrl: devicetree: Delete usage of driver_deferred_probe_check_state() net: mdio: Delete usage of driver_deferred_probe_check_state() driver core: Add wait_for_init_devices_probe helper function net: ipconfig: Relax fw_devlink if we need to mount a network rootfs Revert "driver core: Set default deferred_probe_timeout back to 0." driver core: Set fw_devlink.strict=1 by default iommu/of: Delete usage of driver_deferred_probe_check_state() driver core: Delete driver_deferred_probe_check_state() drivers/base/base.h | 1 + drivers/base/core.c | 102 ++++++++++++++++++++++++++++++--- drivers/base/dd.c | 54 ++++++----------- drivers/base/power/domain.c | 2 +- drivers/iommu/of_iommu.c | 2 +- drivers/net/mdio/fwnode_mdio.c | 4 +- drivers/pinctrl/devicetree.c | 2 +- include/linux/device/driver.h | 2 +- net/ipv4/ipconfig.c | 6 ++ 9 files changed, 126 insertions(+), 49 deletions(-) -- 2.36.1.255.ge46751e96f-goog _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu