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| author | Saravana Kannan <saravanak@google.com> | 2023-03-04 03:53:53 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-10 11:06:21 +0300 |
| commit | ffbe08a8e86d03513dc45b5389fab7f3477433b6 (patch) | |
| tree | 272e4436a7bc2e9a80539751875ce83fbaade0af /drivers/base/base.h | |
| parent | 22fd6153c16a40d123d8c9936967d0a59e417129 (diff) | |
| download | linux-ffbe08a8e86d03513dc45b5389fab7f3477433b6.tar.xz | |
driver core: Add fw_devlink.sync_state command line param
When all devices that could probe have finished probing (based on
deferred_probe_timeout configuration or late_initcall() when
!CONFIG_MODULES), this parameter controls what to do with devices that
haven't yet received their sync_state() calls.
fw_devlink.sync_state=strict is the default and the driver core will
continue waiting on all consumers of a device to probe successfully
before sync_state() is called for the device. This is the default
behavior since calling sync_state() on a device when all its consumers
haven't probed could make some systems unusable/unstable. When this
option is selected, we also print the list of devices that haven't had
sync_state() called on them by the time all devices the could probe have
finished probing.
fw_devlink.sync_state=timeout will cause the driver core to give up
waiting on consumers and call sync_state() on any devices that haven't
yet received their sync_state() calls. This option is provided for
systems that won't become unusable/unstable as they might be able to
save power (depends on state of hardware before kernel starts) if all
devices get their sync_state().
Signed-off-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20230304005355.746421-2-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base/base.h')
| -rw-r--r-- | drivers/base/base.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/base/base.h b/drivers/base/base.h index 726a12a244c0..6fcd71803d35 100644 --- a/drivers/base/base.h +++ b/drivers/base/base.h @@ -209,6 +209,7 @@ extern void device_links_no_driver(struct device *dev); extern bool device_links_busy(struct device *dev); extern void device_links_unbind_consumers(struct device *dev); extern void fw_devlink_drivers_done(void); +extern void fw_devlink_probing_done(void); /* device pm support */ void device_pm_move_to_tail(struct device *dev); |