1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org> 4 * Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de> 5 * Copyright (c) 2008-2012 Novell Inc. 6 * Copyright (c) 2012-2019 Greg Kroah-Hartman <gregkh@linuxfoundation.org> 7 * Copyright (c) 2012-2019 Linux Foundation 8 * 9 * Core driver model functions and structures that should not be 10 * shared outside of the drivers/base/ directory. 11 * 12 */ 13 #include <linux/notifier.h> 14 15 /** 16 * struct subsys_private - structure to hold the private to the driver core portions of the bus_type/class structure. 17 * 18 * @subsys - the struct kset that defines this subsystem 19 * @devices_kset - the subsystem's 'devices' directory 20 * @interfaces - list of subsystem interfaces associated 21 * @mutex - protect the devices, and interfaces lists. 22 * 23 * @drivers_kset - the list of drivers associated 24 * @klist_devices - the klist to iterate over the @devices_kset 25 * @klist_drivers - the klist to iterate over the @drivers_kset 26 * @bus_notifier - the bus notifier list for anything that cares about things 27 * on this bus. 28 * @bus - pointer back to the struct bus_type that this structure is associated 29 * with. 30 * @dev_root: Default device to use as the parent. 31 * 32 * @glue_dirs - "glue" directory to put in-between the parent device to 33 * avoid namespace conflicts 34 * @class - pointer back to the struct class that this structure is associated 35 * with. 36 * @lock_key: Lock class key for use by the lock validator 37 * 38 * This structure is the one that is the actual kobject allowing struct 39 * bus_type/class to be statically allocated safely. Nothing outside of the 40 * driver core should ever touch these fields. 41 */ 42 struct subsys_private { 43 struct kset subsys; 44 struct kset *devices_kset; 45 struct list_head interfaces; 46 struct mutex mutex; 47 48 struct kset *drivers_kset; 49 struct klist klist_devices; 50 struct klist klist_drivers; 51 struct blocking_notifier_head bus_notifier; 52 unsigned int drivers_autoprobe:1; 53 const struct bus_type *bus; 54 struct device *dev_root; 55 56 struct kset glue_dirs; 57 const struct class *class; 58 59 struct lock_class_key lock_key; 60 }; 61 #define to_subsys_private(obj) container_of_const(obj, struct subsys_private, subsys.kobj) 62 63 static inline struct subsys_private *subsys_get(struct subsys_private *sp) 64 { 65 if (sp) 66 kset_get(&sp->subsys); 67 return sp; 68 } 69 70 static inline void subsys_put(struct subsys_private *sp) 71 { 72 if (sp) 73 kset_put(&sp->subsys); 74 } 75 76 struct subsys_private *class_to_subsys(const struct class *class); 77 78 struct driver_private { 79 struct kobject kobj; 80 struct klist klist_devices; 81 struct klist_node knode_bus; 82 struct module_kobject *mkobj; 83 struct device_driver *driver; 84 }; 85 #define to_driver(obj) container_of(obj, struct driver_private, kobj) 86 87 /** 88 * struct device_private - structure to hold the private to the driver core portions of the device structure. 89 * 90 * @klist_children - klist containing all children of this device 91 * @knode_parent - node in sibling list 92 * @knode_driver - node in driver list 93 * @knode_bus - node in bus list 94 * @knode_class - node in class list 95 * @deferred_probe - entry in deferred_probe_list which is used to retry the 96 * binding of drivers which were unable to get all the resources needed by 97 * the device; typically because it depends on another driver getting 98 * probed first. 99 * @async_driver - pointer to device driver awaiting probe via async_probe 100 * @device - pointer back to the struct device that this structure is 101 * associated with. 102 * @dead - This device is currently either in the process of or has been 103 * removed from the system. Any asynchronous events scheduled for this 104 * device should exit without taking any action. 105 * 106 * Nothing outside of the driver core should ever touch these fields. 107 */ 108 struct device_private { 109 struct klist klist_children; 110 struct klist_node knode_parent; 111 struct klist_node knode_driver; 112 struct klist_node knode_bus; 113 struct klist_node knode_class; 114 struct list_head deferred_probe; 115 struct device_driver *async_driver; 116 char *deferred_probe_reason; 117 struct device *device; 118 u8 dead:1; 119 }; 120 #define to_device_private_parent(obj) \ 121 container_of(obj, struct device_private, knode_parent) 122 #define to_device_private_driver(obj) \ 123 container_of(obj, struct device_private, knode_driver) 124 #define to_device_private_bus(obj) \ 125 container_of(obj, struct device_private, knode_bus) 126 #define to_device_private_class(obj) \ 127 container_of(obj, struct device_private, knode_class) 128 129 /* initialisation functions */ 130 int devices_init(void); 131 int buses_init(void); 132 int classes_init(void); 133 int firmware_init(void); 134 #ifdef CONFIG_SYS_HYPERVISOR 135 int hypervisor_init(void); 136 #else 137 static inline int hypervisor_init(void) { return 0; } 138 #endif 139 int platform_bus_init(void); 140 void cpu_dev_init(void); 141 void container_dev_init(void); 142 #ifdef CONFIG_AUXILIARY_BUS 143 void auxiliary_bus_init(void); 144 #else 145 static inline void auxiliary_bus_init(void) { } 146 #endif 147 148 struct kobject *virtual_device_parent(struct device *dev); 149 150 int bus_add_device(struct device *dev); 151 void bus_probe_device(struct device *dev); 152 void bus_remove_device(struct device *dev); 153 void bus_notify(struct device *dev, enum bus_notifier_event value); 154 bool bus_is_registered(const struct bus_type *bus); 155 156 int bus_add_driver(struct device_driver *drv); 157 void bus_remove_driver(struct device_driver *drv); 158 void device_release_driver_internal(struct device *dev, struct device_driver *drv, 159 struct device *parent); 160 161 void driver_detach(struct device_driver *drv); 162 void driver_deferred_probe_del(struct device *dev); 163 void device_set_deferred_probe_reason(const struct device *dev, struct va_format *vaf); 164 static inline int driver_match_device(struct device_driver *drv, 165 struct device *dev) 166 { 167 return drv->bus->match ? drv->bus->match(dev, drv) : 1; 168 } 169 170 static inline void dev_sync_state(struct device *dev) 171 { 172 if (dev->bus->sync_state) 173 dev->bus->sync_state(dev); 174 else if (dev->driver && dev->driver->sync_state) 175 dev->driver->sync_state(dev); 176 } 177 178 int driver_add_groups(struct device_driver *drv, const struct attribute_group **groups); 179 void driver_remove_groups(struct device_driver *drv, const struct attribute_group **groups); 180 void device_driver_detach(struct device *dev); 181 182 int devres_release_all(struct device *dev); 183 void device_block_probing(void); 184 void device_unblock_probing(void); 185 void deferred_probe_extend_timeout(void); 186 void driver_deferred_probe_trigger(void); 187 const char *device_get_devnode(const struct device *dev, umode_t *mode, 188 kuid_t *uid, kgid_t *gid, const char **tmp); 189 190 /* /sys/devices directory */ 191 extern struct kset *devices_kset; 192 void devices_kset_move_last(struct device *dev); 193 194 #if defined(CONFIG_MODULES) && defined(CONFIG_SYSFS) 195 void module_add_driver(struct module *mod, struct device_driver *drv); 196 void module_remove_driver(struct device_driver *drv); 197 #else 198 static inline void module_add_driver(struct module *mod, 199 struct device_driver *drv) { } 200 static inline void module_remove_driver(struct device_driver *drv) { } 201 #endif 202 203 #ifdef CONFIG_DEVTMPFS 204 int devtmpfs_init(void); 205 #else 206 static inline int devtmpfs_init(void) { return 0; } 207 #endif 208 209 #ifdef CONFIG_BLOCK 210 extern struct class block_class; 211 static inline bool is_blockdev(struct device *dev) 212 { 213 return dev->class == &block_class; 214 } 215 #else 216 static inline bool is_blockdev(struct device *dev) { return false; } 217 #endif 218 219 /* Device links support */ 220 int device_links_read_lock(void); 221 void device_links_read_unlock(int idx); 222 int device_links_read_lock_held(void); 223 int device_links_check_suppliers(struct device *dev); 224 void device_links_force_bind(struct device *dev); 225 void device_links_driver_bound(struct device *dev); 226 void device_links_driver_cleanup(struct device *dev); 227 void device_links_no_driver(struct device *dev); 228 bool device_links_busy(struct device *dev); 229 void device_links_unbind_consumers(struct device *dev); 230 void fw_devlink_drivers_done(void); 231 void fw_devlink_probing_done(void); 232 233 /* device pm support */ 234 void device_pm_move_to_tail(struct device *dev); 235 236 #ifdef CONFIG_DEVTMPFS 237 int devtmpfs_create_node(struct device *dev); 238 int devtmpfs_delete_node(struct device *dev); 239 #else 240 static inline int devtmpfs_create_node(struct device *dev) { return 0; } 241 static inline int devtmpfs_delete_node(struct device *dev) { return 0; } 242 #endif 243 244 void software_node_notify(struct device *dev); 245 void software_node_notify_remove(struct device *dev); 246