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716a7a2596
The amount of time spent parsing fwnodes of devices can become really high if the devices are added in an non-ideal order. Worst case can be O(N^2) when N devices are added. But this can be optimized to O(N) by adding all the devices and then parsing all their fwnodes in one batch. This commit adds fw_devlink_pause() and fw_devlink_resume() to allow doing this. Signed-off-by: Saravana Kannan <saravanak@google.com> Link: https://lore.kernel.org/r/20200515053500.215929-4-saravanak@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
198 lines
7.2 KiB
C
198 lines
7.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
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* Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de>
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* Copyright (c) 2008-2012 Novell Inc.
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* Copyright (c) 2012-2019 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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* Copyright (c) 2012-2019 Linux Foundation
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*
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* Core driver model functions and structures that should not be
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* shared outside of the drivers/base/ directory.
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*
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*/
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#include <linux/notifier.h>
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/**
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* struct subsys_private - structure to hold the private to the driver core portions of the bus_type/class structure.
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*
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* @subsys - the struct kset that defines this subsystem
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* @devices_kset - the subsystem's 'devices' directory
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* @interfaces - list of subsystem interfaces associated
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* @mutex - protect the devices, and interfaces lists.
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*
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* @drivers_kset - the list of drivers associated
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* @klist_devices - the klist to iterate over the @devices_kset
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* @klist_drivers - the klist to iterate over the @drivers_kset
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* @bus_notifier - the bus notifier list for anything that cares about things
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* on this bus.
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* @bus - pointer back to the struct bus_type that this structure is associated
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* with.
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*
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* @glue_dirs - "glue" directory to put in-between the parent device to
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* avoid namespace conflicts
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* @class - pointer back to the struct class that this structure is associated
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* with.
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*
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* This structure is the one that is the actual kobject allowing struct
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* bus_type/class to be statically allocated safely. Nothing outside of the
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* driver core should ever touch these fields.
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*/
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struct subsys_private {
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struct kset subsys;
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struct kset *devices_kset;
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struct list_head interfaces;
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struct mutex mutex;
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struct kset *drivers_kset;
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struct klist klist_devices;
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struct klist klist_drivers;
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struct blocking_notifier_head bus_notifier;
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unsigned int drivers_autoprobe:1;
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struct bus_type *bus;
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struct kset glue_dirs;
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struct class *class;
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};
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#define to_subsys_private(obj) container_of(obj, struct subsys_private, subsys.kobj)
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struct driver_private {
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struct kobject kobj;
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struct klist klist_devices;
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struct klist_node knode_bus;
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struct module_kobject *mkobj;
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struct device_driver *driver;
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};
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#define to_driver(obj) container_of(obj, struct driver_private, kobj)
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/**
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* struct device_private - structure to hold the private to the driver core portions of the device structure.
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*
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* @klist_children - klist containing all children of this device
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* @knode_parent - node in sibling list
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* @knode_driver - node in driver list
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* @knode_bus - node in bus list
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* @knode_class - node in class list
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* @deferred_probe - entry in deferred_probe_list which is used to retry the
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* binding of drivers which were unable to get all the resources needed by
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* the device; typically because it depends on another driver getting
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* probed first.
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* @async_driver - pointer to device driver awaiting probe via async_probe
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* @device - pointer back to the struct device that this structure is
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* associated with.
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* @dead - This device is currently either in the process of or has been
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* removed from the system. Any asynchronous events scheduled for this
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* device should exit without taking any action.
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*
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* Nothing outside of the driver core should ever touch these fields.
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*/
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struct device_private {
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struct klist klist_children;
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struct klist_node knode_parent;
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struct klist_node knode_driver;
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struct klist_node knode_bus;
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struct klist_node knode_class;
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struct list_head deferred_probe;
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struct device_driver *async_driver;
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struct device *device;
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u8 dead:1;
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};
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#define to_device_private_parent(obj) \
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container_of(obj, struct device_private, knode_parent)
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#define to_device_private_driver(obj) \
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container_of(obj, struct device_private, knode_driver)
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#define to_device_private_bus(obj) \
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container_of(obj, struct device_private, knode_bus)
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#define to_device_private_class(obj) \
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container_of(obj, struct device_private, knode_class)
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/* initialisation functions */
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extern int devices_init(void);
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extern int buses_init(void);
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extern int classes_init(void);
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extern int firmware_init(void);
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#ifdef CONFIG_SYS_HYPERVISOR
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extern int hypervisor_init(void);
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#else
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static inline int hypervisor_init(void) { return 0; }
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#endif
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extern int platform_bus_init(void);
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extern void cpu_dev_init(void);
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extern void container_dev_init(void);
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struct kobject *virtual_device_parent(struct device *dev);
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extern int bus_add_device(struct device *dev);
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extern void bus_probe_device(struct device *dev);
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extern void bus_remove_device(struct device *dev);
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extern int bus_add_driver(struct device_driver *drv);
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extern void bus_remove_driver(struct device_driver *drv);
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extern void device_release_driver_internal(struct device *dev,
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struct device_driver *drv,
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struct device *parent);
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extern void driver_detach(struct device_driver *drv);
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extern int driver_probe_device(struct device_driver *drv, struct device *dev);
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extern void driver_deferred_probe_del(struct device *dev);
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static inline int driver_match_device(struct device_driver *drv,
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struct device *dev)
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{
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return drv->bus->match ? drv->bus->match(dev, drv) : 1;
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}
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extern bool driver_allows_async_probing(struct device_driver *drv);
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extern int driver_add_groups(struct device_driver *drv,
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const struct attribute_group **groups);
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extern void driver_remove_groups(struct device_driver *drv,
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const struct attribute_group **groups);
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int device_driver_attach(struct device_driver *drv, struct device *dev);
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void device_driver_detach(struct device *dev);
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extern char *make_class_name(const char *name, struct kobject *kobj);
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extern int devres_release_all(struct device *dev);
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extern void device_block_probing(void);
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extern void device_unblock_probing(void);
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extern void driver_deferred_probe_force_trigger(void);
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/* /sys/devices directory */
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extern struct kset *devices_kset;
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extern void devices_kset_move_last(struct device *dev);
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#if defined(CONFIG_MODULES) && defined(CONFIG_SYSFS)
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extern void module_add_driver(struct module *mod, struct device_driver *drv);
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extern void module_remove_driver(struct device_driver *drv);
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#else
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static inline void module_add_driver(struct module *mod,
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struct device_driver *drv) { }
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static inline void module_remove_driver(struct device_driver *drv) { }
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#endif
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#ifdef CONFIG_DEVTMPFS
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extern int devtmpfs_init(void);
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#else
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static inline int devtmpfs_init(void) { return 0; }
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#endif
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/* Device links support */
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extern int device_links_read_lock(void);
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extern void device_links_read_unlock(int idx);
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extern int device_links_read_lock_held(void);
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extern int device_links_check_suppliers(struct device *dev);
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extern void device_links_driver_bound(struct device *dev);
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extern void device_links_driver_cleanup(struct device *dev);
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extern void device_links_no_driver(struct device *dev);
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extern bool device_links_busy(struct device *dev);
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extern void device_links_unbind_consumers(struct device *dev);
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/* device pm support */
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void device_pm_move_to_tail(struct device *dev);
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#ifdef CONFIG_DEVTMPFS
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int devtmpfs_create_node(struct device *dev);
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int devtmpfs_delete_node(struct device *dev);
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#else
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static inline int devtmpfs_create_node(struct device *dev) { return 0; }
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static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
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#endif
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