driver core: Add device link flag DL_FLAG_AUTOPROBE_CONSUMER
Add a new device link flag, DL_FLAG_AUTOPROBE_CONSUMER, to request the driver core to probe for a consumer driver automatically after binding a driver to the supplier device on a persistent managed device link. As unbinding the supplier driver on a managed device link causes the consumer driver to be detached from its device automatically, this flag provides a complementary mechanism which is needed to address some "composite device" use cases. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -94,6 +94,15 @@ Similarly, when the device link is added from supplier's ``->probe`` callback,
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``DL_FLAG_AUTOREMOVE_SUPPLIER`` causes the device link to be automatically
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purged when the supplier fails to probe or later unbinds.
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If neither ``DL_FLAG_AUTOREMOVE_CONSUMER`` nor ``DL_FLAG_AUTOREMOVE_SUPPLIER``
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is set, ``DL_FLAG_AUTOPROBE_CONSUMER`` can be used to request the driver core
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to probe for a driver for the consumer driver on the link automatically after
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a driver has been bound to the supplier device.
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Note, however, that any combinations of ``DL_FLAG_AUTOREMOVE_CONSUMER``,
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``DL_FLAG_AUTOREMOVE_SUPPLIER`` or ``DL_FLAG_AUTOPROBE_CONSUMER`` with
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``DL_FLAG_STATELESS`` are invalid and cannot be used.
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Limitations
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===========
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@ -208,6 +208,12 @@ static void device_link_rpm_prepare(struct device *consumer,
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* the link will be maintained until one of the devices pointed to by it (either
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* the consumer or the supplier) is unregistered.
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*
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* Also, if DL_FLAG_STATELESS, DL_FLAG_AUTOREMOVE_CONSUMER and
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* DL_FLAG_AUTOREMOVE_SUPPLIER are not set in @flags (that is, a persistent
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* managed device link is being added), the DL_FLAG_AUTOPROBE_CONSUMER flag can
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* be used to request the driver core to automaticall probe for a consmer
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* driver after successfully binding a driver to the supplier device.
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*
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* The combination of DL_FLAG_STATELESS and either DL_FLAG_AUTOREMOVE_CONSUMER
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* or DL_FLAG_AUTOREMOVE_SUPPLIER set in @flags at the same time is invalid and
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* will cause NULL to be returned upfront.
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@ -228,7 +234,12 @@ struct device_link *device_link_add(struct device *consumer,
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if (!consumer || !supplier ||
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(flags & DL_FLAG_STATELESS &&
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flags & (DL_FLAG_AUTOREMOVE_CONSUMER | DL_FLAG_AUTOREMOVE_SUPPLIER)))
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flags & (DL_FLAG_AUTOREMOVE_CONSUMER |
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DL_FLAG_AUTOREMOVE_SUPPLIER |
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DL_FLAG_AUTOPROBE_CONSUMER)) ||
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(flags & DL_FLAG_AUTOPROBE_CONSUMER &&
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flags & (DL_FLAG_AUTOREMOVE_CONSUMER |
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DL_FLAG_AUTOREMOVE_SUPPLIER)))
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return NULL;
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if (flags & DL_FLAG_PM_RUNTIME && flags & DL_FLAG_RPM_ACTIVE) {
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@ -589,6 +600,9 @@ void device_links_driver_bound(struct device *dev)
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WARN_ON(link->status != DL_STATE_DORMANT);
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WRITE_ONCE(link->status, DL_STATE_AVAILABLE);
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if (link->flags & DL_FLAG_AUTOPROBE_CONSUMER)
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driver_deferred_probe_add(link->consumer);
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}
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list_for_each_entry(link, &dev->links.suppliers, c_node) {
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@ -116,7 +116,7 @@ static void deferred_probe_work_func(struct work_struct *work)
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}
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static DECLARE_WORK(deferred_probe_work, deferred_probe_work_func);
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static void driver_deferred_probe_add(struct device *dev)
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void driver_deferred_probe_add(struct device *dev)
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{
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mutex_lock(&deferred_probe_mutex);
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if (list_empty(&dev->p->deferred_probe)) {
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@ -341,6 +341,7 @@ struct device *driver_find_device(struct device_driver *drv,
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struct device *start, void *data,
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int (*match)(struct device *dev, void *data));
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void driver_deferred_probe_add(struct device *dev);
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int driver_deferred_probe_check_state(struct device *dev);
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/**
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@ -827,12 +828,14 @@ enum device_link_state {
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* PM_RUNTIME: If set, the runtime PM framework will use this link.
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* RPM_ACTIVE: Run pm_runtime_get_sync() on the supplier during link creation.
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* AUTOREMOVE_SUPPLIER: Remove the link automatically on supplier driver unbind.
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* AUTOPROBE_CONSUMER: Probe consumer driver automatically after supplier binds.
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*/
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#define DL_FLAG_STATELESS BIT(0)
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#define DL_FLAG_AUTOREMOVE_CONSUMER BIT(1)
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#define DL_FLAG_PM_RUNTIME BIT(2)
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#define DL_FLAG_RPM_ACTIVE BIT(3)
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#define DL_FLAG_AUTOREMOVE_SUPPLIER BIT(4)
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#define DL_FLAG_AUTOPROBE_CONSUMER BIT(5)
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/**
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* struct device_link - Device link representation.
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