mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 13:55:32 +00:00
![Christian Brauner](/assets/img/avatar_default.png)
Add a helper to change the owner of a device's sysfs entries. This needs to happen when the ownership of a device is changed, e.g. when moving network devices between network namespaces. This function will be used to correctly account for ownership changes, e.g. when moving network devices between network namespaces. Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
975 lines
32 KiB
C
975 lines
32 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* device.h - generic, centralized driver model
|
|
*
|
|
* Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
|
|
* Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de>
|
|
* Copyright (c) 2008-2009 Novell Inc.
|
|
*
|
|
* See Documentation/driver-api/driver-model/ for more information.
|
|
*/
|
|
|
|
#ifndef _DEVICE_H_
|
|
#define _DEVICE_H_
|
|
|
|
#include <linux/dev_printk.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/kobject.h>
|
|
#include <linux/klist.h>
|
|
#include <linux/list.h>
|
|
#include <linux/lockdep.h>
|
|
#include <linux/compiler.h>
|
|
#include <linux/types.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/pm.h>
|
|
#include <linux/atomic.h>
|
|
#include <linux/uidgid.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/overflow.h>
|
|
#include <linux/device/bus.h>
|
|
#include <linux/device/class.h>
|
|
#include <linux/device/driver.h>
|
|
#include <asm/device.h>
|
|
|
|
struct device;
|
|
struct device_private;
|
|
struct device_driver;
|
|
struct driver_private;
|
|
struct module;
|
|
struct class;
|
|
struct subsys_private;
|
|
struct device_node;
|
|
struct fwnode_handle;
|
|
struct iommu_ops;
|
|
struct iommu_group;
|
|
struct iommu_fwspec;
|
|
struct dev_pin_info;
|
|
struct iommu_param;
|
|
|
|
/**
|
|
* struct subsys_interface - interfaces to device functions
|
|
* @name: name of the device function
|
|
* @subsys: subsytem of the devices to attach to
|
|
* @node: the list of functions registered at the subsystem
|
|
* @add_dev: device hookup to device function handler
|
|
* @remove_dev: device hookup to device function handler
|
|
*
|
|
* Simple interfaces attached to a subsystem. Multiple interfaces can
|
|
* attach to a subsystem and its devices. Unlike drivers, they do not
|
|
* exclusively claim or control devices. Interfaces usually represent
|
|
* a specific functionality of a subsystem/class of devices.
|
|
*/
|
|
struct subsys_interface {
|
|
const char *name;
|
|
struct bus_type *subsys;
|
|
struct list_head node;
|
|
int (*add_dev)(struct device *dev, struct subsys_interface *sif);
|
|
void (*remove_dev)(struct device *dev, struct subsys_interface *sif);
|
|
};
|
|
|
|
int subsys_interface_register(struct subsys_interface *sif);
|
|
void subsys_interface_unregister(struct subsys_interface *sif);
|
|
|
|
int subsys_system_register(struct bus_type *subsys,
|
|
const struct attribute_group **groups);
|
|
int subsys_virtual_register(struct bus_type *subsys,
|
|
const struct attribute_group **groups);
|
|
|
|
/*
|
|
* The type of device, "struct device" is embedded in. A class
|
|
* or bus can contain devices of different types
|
|
* like "partitions" and "disks", "mouse" and "event".
|
|
* This identifies the device type and carries type-specific
|
|
* information, equivalent to the kobj_type of a kobject.
|
|
* If "name" is specified, the uevent will contain it in
|
|
* the DEVTYPE variable.
|
|
*/
|
|
struct device_type {
|
|
const char *name;
|
|
const struct attribute_group **groups;
|
|
int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
|
|
char *(*devnode)(struct device *dev, umode_t *mode,
|
|
kuid_t *uid, kgid_t *gid);
|
|
void (*release)(struct device *dev);
|
|
|
|
const struct dev_pm_ops *pm;
|
|
};
|
|
|
|
/* interface for exporting device attributes */
|
|
struct device_attribute {
|
|
struct attribute attr;
|
|
ssize_t (*show)(struct device *dev, struct device_attribute *attr,
|
|
char *buf);
|
|
ssize_t (*store)(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count);
|
|
};
|
|
|
|
struct dev_ext_attribute {
|
|
struct device_attribute attr;
|
|
void *var;
|
|
};
|
|
|
|
ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr,
|
|
char *buf);
|
|
ssize_t device_store_ulong(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count);
|
|
ssize_t device_show_int(struct device *dev, struct device_attribute *attr,
|
|
char *buf);
|
|
ssize_t device_store_int(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count);
|
|
ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,
|
|
char *buf);
|
|
ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count);
|
|
|
|
#define DEVICE_ATTR(_name, _mode, _show, _store) \
|
|
struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
|
|
#define DEVICE_ATTR_PREALLOC(_name, _mode, _show, _store) \
|
|
struct device_attribute dev_attr_##_name = \
|
|
__ATTR_PREALLOC(_name, _mode, _show, _store)
|
|
#define DEVICE_ATTR_RW(_name) \
|
|
struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
|
|
#define DEVICE_ATTR_RO(_name) \
|
|
struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
|
|
#define DEVICE_ATTR_WO(_name) \
|
|
struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
|
|
#define DEVICE_ULONG_ATTR(_name, _mode, _var) \
|
|
struct dev_ext_attribute dev_attr_##_name = \
|
|
{ __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
|
|
#define DEVICE_INT_ATTR(_name, _mode, _var) \
|
|
struct dev_ext_attribute dev_attr_##_name = \
|
|
{ __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
|
|
#define DEVICE_BOOL_ATTR(_name, _mode, _var) \
|
|
struct dev_ext_attribute dev_attr_##_name = \
|
|
{ __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
|
|
#define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
|
|
struct device_attribute dev_attr_##_name = \
|
|
__ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
|
|
|
|
extern int device_create_file(struct device *device,
|
|
const struct device_attribute *entry);
|
|
extern void device_remove_file(struct device *dev,
|
|
const struct device_attribute *attr);
|
|
extern bool device_remove_file_self(struct device *dev,
|
|
const struct device_attribute *attr);
|
|
extern int __must_check device_create_bin_file(struct device *dev,
|
|
const struct bin_attribute *attr);
|
|
extern void device_remove_bin_file(struct device *dev,
|
|
const struct bin_attribute *attr);
|
|
|
|
/* device resource management */
|
|
typedef void (*dr_release_t)(struct device *dev, void *res);
|
|
typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
|
|
|
|
#ifdef CONFIG_DEBUG_DEVRES
|
|
extern void *__devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
|
|
int nid, const char *name) __malloc;
|
|
#define devres_alloc(release, size, gfp) \
|
|
__devres_alloc_node(release, size, gfp, NUMA_NO_NODE, #release)
|
|
#define devres_alloc_node(release, size, gfp, nid) \
|
|
__devres_alloc_node(release, size, gfp, nid, #release)
|
|
#else
|
|
extern void *devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
|
|
int nid) __malloc;
|
|
static inline void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp)
|
|
{
|
|
return devres_alloc_node(release, size, gfp, NUMA_NO_NODE);
|
|
}
|
|
#endif
|
|
|
|
extern void devres_for_each_res(struct device *dev, dr_release_t release,
|
|
dr_match_t match, void *match_data,
|
|
void (*fn)(struct device *, void *, void *),
|
|
void *data);
|
|
extern void devres_free(void *res);
|
|
extern void devres_add(struct device *dev, void *res);
|
|
extern void *devres_find(struct device *dev, dr_release_t release,
|
|
dr_match_t match, void *match_data);
|
|
extern void *devres_get(struct device *dev, void *new_res,
|
|
dr_match_t match, void *match_data);
|
|
extern void *devres_remove(struct device *dev, dr_release_t release,
|
|
dr_match_t match, void *match_data);
|
|
extern int devres_destroy(struct device *dev, dr_release_t release,
|
|
dr_match_t match, void *match_data);
|
|
extern int devres_release(struct device *dev, dr_release_t release,
|
|
dr_match_t match, void *match_data);
|
|
|
|
/* devres group */
|
|
extern void * __must_check devres_open_group(struct device *dev, void *id,
|
|
gfp_t gfp);
|
|
extern void devres_close_group(struct device *dev, void *id);
|
|
extern void devres_remove_group(struct device *dev, void *id);
|
|
extern int devres_release_group(struct device *dev, void *id);
|
|
|
|
/* managed devm_k.alloc/kfree for device drivers */
|
|
extern void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc;
|
|
extern __printf(3, 0)
|
|
char *devm_kvasprintf(struct device *dev, gfp_t gfp, const char *fmt,
|
|
va_list ap) __malloc;
|
|
extern __printf(3, 4)
|
|
char *devm_kasprintf(struct device *dev, gfp_t gfp, const char *fmt, ...) __malloc;
|
|
static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp)
|
|
{
|
|
return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
|
|
}
|
|
static inline void *devm_kmalloc_array(struct device *dev,
|
|
size_t n, size_t size, gfp_t flags)
|
|
{
|
|
size_t bytes;
|
|
|
|
if (unlikely(check_mul_overflow(n, size, &bytes)))
|
|
return NULL;
|
|
|
|
return devm_kmalloc(dev, bytes, flags);
|
|
}
|
|
static inline void *devm_kcalloc(struct device *dev,
|
|
size_t n, size_t size, gfp_t flags)
|
|
{
|
|
return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
|
|
}
|
|
extern void devm_kfree(struct device *dev, const void *p);
|
|
extern char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc;
|
|
extern const char *devm_kstrdup_const(struct device *dev,
|
|
const char *s, gfp_t gfp);
|
|
extern void *devm_kmemdup(struct device *dev, const void *src, size_t len,
|
|
gfp_t gfp);
|
|
|
|
extern unsigned long devm_get_free_pages(struct device *dev,
|
|
gfp_t gfp_mask, unsigned int order);
|
|
extern void devm_free_pages(struct device *dev, unsigned long addr);
|
|
|
|
void __iomem *devm_ioremap_resource(struct device *dev,
|
|
const struct resource *res);
|
|
void __iomem *devm_ioremap_resource_wc(struct device *dev,
|
|
const struct resource *res);
|
|
|
|
void __iomem *devm_of_iomap(struct device *dev,
|
|
struct device_node *node, int index,
|
|
resource_size_t *size);
|
|
|
|
/* allows to add/remove a custom action to devres stack */
|
|
int devm_add_action(struct device *dev, void (*action)(void *), void *data);
|
|
void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
|
|
void devm_release_action(struct device *dev, void (*action)(void *), void *data);
|
|
|
|
static inline int devm_add_action_or_reset(struct device *dev,
|
|
void (*action)(void *), void *data)
|
|
{
|
|
int ret;
|
|
|
|
ret = devm_add_action(dev, action, data);
|
|
if (ret)
|
|
action(data);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* devm_alloc_percpu - Resource-managed alloc_percpu
|
|
* @dev: Device to allocate per-cpu memory for
|
|
* @type: Type to allocate per-cpu memory for
|
|
*
|
|
* Managed alloc_percpu. Per-cpu memory allocated with this function is
|
|
* automatically freed on driver detach.
|
|
*
|
|
* RETURNS:
|
|
* Pointer to allocated memory on success, NULL on failure.
|
|
*/
|
|
#define devm_alloc_percpu(dev, type) \
|
|
((typeof(type) __percpu *)__devm_alloc_percpu((dev), sizeof(type), \
|
|
__alignof__(type)))
|
|
|
|
void __percpu *__devm_alloc_percpu(struct device *dev, size_t size,
|
|
size_t align);
|
|
void devm_free_percpu(struct device *dev, void __percpu *pdata);
|
|
|
|
struct device_dma_parameters {
|
|
/*
|
|
* a low level driver may set these to teach IOMMU code about
|
|
* sg limitations.
|
|
*/
|
|
unsigned int max_segment_size;
|
|
unsigned long segment_boundary_mask;
|
|
};
|
|
|
|
/**
|
|
* struct device_connection - Device Connection Descriptor
|
|
* @fwnode: The device node of the connected device
|
|
* @endpoint: The names of the two devices connected together
|
|
* @id: Unique identifier for the connection
|
|
* @list: List head, private, for internal use only
|
|
*
|
|
* NOTE: @fwnode is not used together with @endpoint. @fwnode is used when
|
|
* platform firmware defines the connection. When the connection is registered
|
|
* with device_connection_add() @endpoint is used instead.
|
|
*/
|
|
struct device_connection {
|
|
struct fwnode_handle *fwnode;
|
|
const char *endpoint[2];
|
|
const char *id;
|
|
struct list_head list;
|
|
};
|
|
|
|
typedef void *(*devcon_match_fn_t)(struct device_connection *con, int ep,
|
|
void *data);
|
|
|
|
void *fwnode_connection_find_match(struct fwnode_handle *fwnode,
|
|
const char *con_id, void *data,
|
|
devcon_match_fn_t match);
|
|
void *device_connection_find_match(struct device *dev, const char *con_id,
|
|
void *data, devcon_match_fn_t match);
|
|
|
|
struct device *device_connection_find(struct device *dev, const char *con_id);
|
|
|
|
void device_connection_add(struct device_connection *con);
|
|
void device_connection_remove(struct device_connection *con);
|
|
|
|
/**
|
|
* device_connections_add - Add multiple device connections at once
|
|
* @cons: Zero terminated array of device connection descriptors
|
|
*/
|
|
static inline void device_connections_add(struct device_connection *cons)
|
|
{
|
|
struct device_connection *c;
|
|
|
|
for (c = cons; c->endpoint[0]; c++)
|
|
device_connection_add(c);
|
|
}
|
|
|
|
/**
|
|
* device_connections_remove - Remove multiple device connections at once
|
|
* @cons: Zero terminated array of device connection descriptors
|
|
*/
|
|
static inline void device_connections_remove(struct device_connection *cons)
|
|
{
|
|
struct device_connection *c;
|
|
|
|
for (c = cons; c->endpoint[0]; c++)
|
|
device_connection_remove(c);
|
|
}
|
|
|
|
/**
|
|
* enum device_link_state - Device link states.
|
|
* @DL_STATE_NONE: The presence of the drivers is not being tracked.
|
|
* @DL_STATE_DORMANT: None of the supplier/consumer drivers is present.
|
|
* @DL_STATE_AVAILABLE: The supplier driver is present, but the consumer is not.
|
|
* @DL_STATE_CONSUMER_PROBE: The consumer is probing (supplier driver present).
|
|
* @DL_STATE_ACTIVE: Both the supplier and consumer drivers are present.
|
|
* @DL_STATE_SUPPLIER_UNBIND: The supplier driver is unbinding.
|
|
*/
|
|
enum device_link_state {
|
|
DL_STATE_NONE = -1,
|
|
DL_STATE_DORMANT = 0,
|
|
DL_STATE_AVAILABLE,
|
|
DL_STATE_CONSUMER_PROBE,
|
|
DL_STATE_ACTIVE,
|
|
DL_STATE_SUPPLIER_UNBIND,
|
|
};
|
|
|
|
/*
|
|
* Device link flags.
|
|
*
|
|
* STATELESS: The core will not remove this link automatically.
|
|
* AUTOREMOVE_CONSUMER: Remove the link automatically on consumer driver unbind.
|
|
* PM_RUNTIME: If set, the runtime PM framework will use this link.
|
|
* RPM_ACTIVE: Run pm_runtime_get_sync() on the supplier during link creation.
|
|
* AUTOREMOVE_SUPPLIER: Remove the link automatically on supplier driver unbind.
|
|
* AUTOPROBE_CONSUMER: Probe consumer driver automatically after supplier binds.
|
|
* MANAGED: The core tracks presence of supplier/consumer drivers (internal).
|
|
* SYNC_STATE_ONLY: Link only affects sync_state() behavior.
|
|
*/
|
|
#define DL_FLAG_STATELESS BIT(0)
|
|
#define DL_FLAG_AUTOREMOVE_CONSUMER BIT(1)
|
|
#define DL_FLAG_PM_RUNTIME BIT(2)
|
|
#define DL_FLAG_RPM_ACTIVE BIT(3)
|
|
#define DL_FLAG_AUTOREMOVE_SUPPLIER BIT(4)
|
|
#define DL_FLAG_AUTOPROBE_CONSUMER BIT(5)
|
|
#define DL_FLAG_MANAGED BIT(6)
|
|
#define DL_FLAG_SYNC_STATE_ONLY BIT(7)
|
|
|
|
/**
|
|
* struct device_link - Device link representation.
|
|
* @supplier: The device on the supplier end of the link.
|
|
* @s_node: Hook to the supplier device's list of links to consumers.
|
|
* @consumer: The device on the consumer end of the link.
|
|
* @c_node: Hook to the consumer device's list of links to suppliers.
|
|
* @status: The state of the link (with respect to the presence of drivers).
|
|
* @flags: Link flags.
|
|
* @rpm_active: Whether or not the consumer device is runtime-PM-active.
|
|
* @kref: Count repeated addition of the same link.
|
|
* @rcu_head: An RCU head to use for deferred execution of SRCU callbacks.
|
|
* @supplier_preactivated: Supplier has been made active before consumer probe.
|
|
*/
|
|
struct device_link {
|
|
struct device *supplier;
|
|
struct list_head s_node;
|
|
struct device *consumer;
|
|
struct list_head c_node;
|
|
enum device_link_state status;
|
|
u32 flags;
|
|
refcount_t rpm_active;
|
|
struct kref kref;
|
|
#ifdef CONFIG_SRCU
|
|
struct rcu_head rcu_head;
|
|
#endif
|
|
bool supplier_preactivated; /* Owned by consumer probe. */
|
|
};
|
|
|
|
/**
|
|
* enum dl_dev_state - Device driver presence tracking information.
|
|
* @DL_DEV_NO_DRIVER: There is no driver attached to the device.
|
|
* @DL_DEV_PROBING: A driver is probing.
|
|
* @DL_DEV_DRIVER_BOUND: The driver has been bound to the device.
|
|
* @DL_DEV_UNBINDING: The driver is unbinding from the device.
|
|
*/
|
|
enum dl_dev_state {
|
|
DL_DEV_NO_DRIVER = 0,
|
|
DL_DEV_PROBING,
|
|
DL_DEV_DRIVER_BOUND,
|
|
DL_DEV_UNBINDING,
|
|
};
|
|
|
|
/**
|
|
* struct dev_links_info - Device data related to device links.
|
|
* @suppliers: List of links to supplier devices.
|
|
* @consumers: List of links to consumer devices.
|
|
* @needs_suppliers: Hook to global list of devices waiting for suppliers.
|
|
* @defer_sync: Hook to global list of devices that have deferred sync_state.
|
|
* @need_for_probe: If needs_suppliers is on a list, this indicates if the
|
|
* suppliers are needed for probe or not.
|
|
* @status: Driver status information.
|
|
*/
|
|
struct dev_links_info {
|
|
struct list_head suppliers;
|
|
struct list_head consumers;
|
|
struct list_head needs_suppliers;
|
|
struct list_head defer_sync;
|
|
bool need_for_probe;
|
|
enum dl_dev_state status;
|
|
};
|
|
|
|
/**
|
|
* struct device - The basic device structure
|
|
* @parent: The device's "parent" device, the device to which it is attached.
|
|
* In most cases, a parent device is some sort of bus or host
|
|
* controller. If parent is NULL, the device, is a top-level device,
|
|
* which is not usually what you want.
|
|
* @p: Holds the private data of the driver core portions of the device.
|
|
* See the comment of the struct device_private for detail.
|
|
* @kobj: A top-level, abstract class from which other classes are derived.
|
|
* @init_name: Initial name of the device.
|
|
* @type: The type of device.
|
|
* This identifies the device type and carries type-specific
|
|
* information.
|
|
* @mutex: Mutex to synchronize calls to its driver.
|
|
* @lockdep_mutex: An optional debug lock that a subsystem can use as a
|
|
* peer lock to gain localized lockdep coverage of the device_lock.
|
|
* @bus: Type of bus device is on.
|
|
* @driver: Which driver has allocated this
|
|
* @platform_data: Platform data specific to the device.
|
|
* Example: For devices on custom boards, as typical of embedded
|
|
* and SOC based hardware, Linux often uses platform_data to point
|
|
* to board-specific structures describing devices and how they
|
|
* are wired. That can include what ports are available, chip
|
|
* variants, which GPIO pins act in what additional roles, and so
|
|
* on. This shrinks the "Board Support Packages" (BSPs) and
|
|
* minimizes board-specific #ifdefs in drivers.
|
|
* @driver_data: Private pointer for driver specific info.
|
|
* @links: Links to suppliers and consumers of this device.
|
|
* @power: For device power management.
|
|
* See Documentation/driver-api/pm/devices.rst for details.
|
|
* @pm_domain: Provide callbacks that are executed during system suspend,
|
|
* hibernation, system resume and during runtime PM transitions
|
|
* along with subsystem-level and driver-level callbacks.
|
|
* @pins: For device pin management.
|
|
* See Documentation/driver-api/pinctl.rst for details.
|
|
* @msi_list: Hosts MSI descriptors
|
|
* @msi_domain: The generic MSI domain this device is using.
|
|
* @numa_node: NUMA node this device is close to.
|
|
* @dma_ops: DMA mapping operations for this device.
|
|
* @dma_mask: Dma mask (if dma'ble device).
|
|
* @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
|
|
* hardware supports 64-bit addresses for consistent allocations
|
|
* such descriptors.
|
|
* @bus_dma_limit: Limit of an upstream bridge or bus which imposes a smaller
|
|
* DMA limit than the device itself supports.
|
|
* @dma_pfn_offset: offset of DMA memory range relatively of RAM
|
|
* @dma_parms: A low level driver may set these to teach IOMMU code about
|
|
* segment limitations.
|
|
* @dma_pools: Dma pools (if dma'ble device).
|
|
* @dma_mem: Internal for coherent mem override.
|
|
* @cma_area: Contiguous memory area for dma allocations
|
|
* @archdata: For arch-specific additions.
|
|
* @of_node: Associated device tree node.
|
|
* @fwnode: Associated device node supplied by platform firmware.
|
|
* @devt: For creating the sysfs "dev".
|
|
* @id: device instance
|
|
* @devres_lock: Spinlock to protect the resource of the device.
|
|
* @devres_head: The resources list of the device.
|
|
* @knode_class: The node used to add the device to the class list.
|
|
* @class: The class of the device.
|
|
* @groups: Optional attribute groups.
|
|
* @release: Callback to free the device after all references have
|
|
* gone away. This should be set by the allocator of the
|
|
* device (i.e. the bus driver that discovered the device).
|
|
* @iommu_group: IOMMU group the device belongs to.
|
|
* @iommu_fwspec: IOMMU-specific properties supplied by firmware.
|
|
* @iommu_param: Per device generic IOMMU runtime data
|
|
*
|
|
* @offline_disabled: If set, the device is permanently online.
|
|
* @offline: Set after successful invocation of bus type's .offline().
|
|
* @of_node_reused: Set if the device-tree node is shared with an ancestor
|
|
* device.
|
|
* @state_synced: The hardware state of this device has been synced to match
|
|
* the software state of this device by calling the driver/bus
|
|
* sync_state() callback.
|
|
* @dma_coherent: this particular device is dma coherent, even if the
|
|
* architecture supports non-coherent devices.
|
|
*
|
|
* At the lowest level, every device in a Linux system is represented by an
|
|
* instance of struct device. The device structure contains the information
|
|
* that the device model core needs to model the system. Most subsystems,
|
|
* however, track additional information about the devices they host. As a
|
|
* result, it is rare for devices to be represented by bare device structures;
|
|
* instead, that structure, like kobject structures, is usually embedded within
|
|
* a higher-level representation of the device.
|
|
*/
|
|
struct device {
|
|
struct kobject kobj;
|
|
struct device *parent;
|
|
|
|
struct device_private *p;
|
|
|
|
const char *init_name; /* initial name of the device */
|
|
const struct device_type *type;
|
|
|
|
struct bus_type *bus; /* type of bus device is on */
|
|
struct device_driver *driver; /* which driver has allocated this
|
|
device */
|
|
void *platform_data; /* Platform specific data, device
|
|
core doesn't touch it */
|
|
void *driver_data; /* Driver data, set and get with
|
|
dev_set_drvdata/dev_get_drvdata */
|
|
#ifdef CONFIG_PROVE_LOCKING
|
|
struct mutex lockdep_mutex;
|
|
#endif
|
|
struct mutex mutex; /* mutex to synchronize calls to
|
|
* its driver.
|
|
*/
|
|
|
|
struct dev_links_info links;
|
|
struct dev_pm_info power;
|
|
struct dev_pm_domain *pm_domain;
|
|
|
|
#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
|
|
struct irq_domain *msi_domain;
|
|
#endif
|
|
#ifdef CONFIG_PINCTRL
|
|
struct dev_pin_info *pins;
|
|
#endif
|
|
#ifdef CONFIG_GENERIC_MSI_IRQ
|
|
struct list_head msi_list;
|
|
#endif
|
|
|
|
const struct dma_map_ops *dma_ops;
|
|
u64 *dma_mask; /* dma mask (if dma'able device) */
|
|
u64 coherent_dma_mask;/* Like dma_mask, but for
|
|
alloc_coherent mappings as
|
|
not all hardware supports
|
|
64 bit addresses for consistent
|
|
allocations such descriptors. */
|
|
u64 bus_dma_limit; /* upstream dma constraint */
|
|
unsigned long dma_pfn_offset;
|
|
|
|
struct device_dma_parameters *dma_parms;
|
|
|
|
struct list_head dma_pools; /* dma pools (if dma'ble) */
|
|
|
|
#ifdef CONFIG_DMA_DECLARE_COHERENT
|
|
struct dma_coherent_mem *dma_mem; /* internal for coherent mem
|
|
override */
|
|
#endif
|
|
#ifdef CONFIG_DMA_CMA
|
|
struct cma *cma_area; /* contiguous memory area for dma
|
|
allocations */
|
|
#endif
|
|
/* arch specific additions */
|
|
struct dev_archdata archdata;
|
|
|
|
struct device_node *of_node; /* associated device tree node */
|
|
struct fwnode_handle *fwnode; /* firmware device node */
|
|
|
|
#ifdef CONFIG_NUMA
|
|
int numa_node; /* NUMA node this device is close to */
|
|
#endif
|
|
dev_t devt; /* dev_t, creates the sysfs "dev" */
|
|
u32 id; /* device instance */
|
|
|
|
spinlock_t devres_lock;
|
|
struct list_head devres_head;
|
|
|
|
struct class *class;
|
|
const struct attribute_group **groups; /* optional groups */
|
|
|
|
void (*release)(struct device *dev);
|
|
struct iommu_group *iommu_group;
|
|
struct iommu_fwspec *iommu_fwspec;
|
|
struct iommu_param *iommu_param;
|
|
|
|
bool offline_disabled:1;
|
|
bool offline:1;
|
|
bool of_node_reused:1;
|
|
bool state_synced:1;
|
|
#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
|
|
defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
|
|
defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
|
|
bool dma_coherent:1;
|
|
#endif
|
|
};
|
|
|
|
static inline struct device *kobj_to_dev(struct kobject *kobj)
|
|
{
|
|
return container_of(kobj, struct device, kobj);
|
|
}
|
|
|
|
/**
|
|
* device_iommu_mapped - Returns true when the device DMA is translated
|
|
* by an IOMMU
|
|
* @dev: Device to perform the check on
|
|
*/
|
|
static inline bool device_iommu_mapped(struct device *dev)
|
|
{
|
|
return (dev->iommu_group != NULL);
|
|
}
|
|
|
|
/* Get the wakeup routines, which depend on struct device */
|
|
#include <linux/pm_wakeup.h>
|
|
|
|
static inline const char *dev_name(const struct device *dev)
|
|
{
|
|
/* Use the init name until the kobject becomes available */
|
|
if (dev->init_name)
|
|
return dev->init_name;
|
|
|
|
return kobject_name(&dev->kobj);
|
|
}
|
|
|
|
extern __printf(2, 3)
|
|
int dev_set_name(struct device *dev, const char *name, ...);
|
|
|
|
#ifdef CONFIG_NUMA
|
|
static inline int dev_to_node(struct device *dev)
|
|
{
|
|
return dev->numa_node;
|
|
}
|
|
static inline void set_dev_node(struct device *dev, int node)
|
|
{
|
|
dev->numa_node = node;
|
|
}
|
|
#else
|
|
static inline int dev_to_node(struct device *dev)
|
|
{
|
|
return NUMA_NO_NODE;
|
|
}
|
|
static inline void set_dev_node(struct device *dev, int node)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static inline struct irq_domain *dev_get_msi_domain(const struct device *dev)
|
|
{
|
|
#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
|
|
return dev->msi_domain;
|
|
#else
|
|
return NULL;
|
|
#endif
|
|
}
|
|
|
|
static inline void dev_set_msi_domain(struct device *dev, struct irq_domain *d)
|
|
{
|
|
#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
|
|
dev->msi_domain = d;
|
|
#endif
|
|
}
|
|
|
|
static inline void *dev_get_drvdata(const struct device *dev)
|
|
{
|
|
return dev->driver_data;
|
|
}
|
|
|
|
static inline void dev_set_drvdata(struct device *dev, void *data)
|
|
{
|
|
dev->driver_data = data;
|
|
}
|
|
|
|
static inline struct pm_subsys_data *dev_to_psd(struct device *dev)
|
|
{
|
|
return dev ? dev->power.subsys_data : NULL;
|
|
}
|
|
|
|
static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
|
|
{
|
|
return dev->kobj.uevent_suppress;
|
|
}
|
|
|
|
static inline void dev_set_uevent_suppress(struct device *dev, int val)
|
|
{
|
|
dev->kobj.uevent_suppress = val;
|
|
}
|
|
|
|
static inline int device_is_registered(struct device *dev)
|
|
{
|
|
return dev->kobj.state_in_sysfs;
|
|
}
|
|
|
|
static inline void device_enable_async_suspend(struct device *dev)
|
|
{
|
|
if (!dev->power.is_prepared)
|
|
dev->power.async_suspend = true;
|
|
}
|
|
|
|
static inline void device_disable_async_suspend(struct device *dev)
|
|
{
|
|
if (!dev->power.is_prepared)
|
|
dev->power.async_suspend = false;
|
|
}
|
|
|
|
static inline bool device_async_suspend_enabled(struct device *dev)
|
|
{
|
|
return !!dev->power.async_suspend;
|
|
}
|
|
|
|
static inline bool device_pm_not_required(struct device *dev)
|
|
{
|
|
return dev->power.no_pm;
|
|
}
|
|
|
|
static inline void device_set_pm_not_required(struct device *dev)
|
|
{
|
|
dev->power.no_pm = true;
|
|
}
|
|
|
|
static inline void dev_pm_syscore_device(struct device *dev, bool val)
|
|
{
|
|
#ifdef CONFIG_PM_SLEEP
|
|
dev->power.syscore = val;
|
|
#endif
|
|
}
|
|
|
|
static inline void dev_pm_set_driver_flags(struct device *dev, u32 flags)
|
|
{
|
|
dev->power.driver_flags = flags;
|
|
}
|
|
|
|
static inline bool dev_pm_test_driver_flags(struct device *dev, u32 flags)
|
|
{
|
|
return !!(dev->power.driver_flags & flags);
|
|
}
|
|
|
|
static inline void device_lock(struct device *dev)
|
|
{
|
|
mutex_lock(&dev->mutex);
|
|
}
|
|
|
|
static inline int device_lock_interruptible(struct device *dev)
|
|
{
|
|
return mutex_lock_interruptible(&dev->mutex);
|
|
}
|
|
|
|
static inline int device_trylock(struct device *dev)
|
|
{
|
|
return mutex_trylock(&dev->mutex);
|
|
}
|
|
|
|
static inline void device_unlock(struct device *dev)
|
|
{
|
|
mutex_unlock(&dev->mutex);
|
|
}
|
|
|
|
static inline void device_lock_assert(struct device *dev)
|
|
{
|
|
lockdep_assert_held(&dev->mutex);
|
|
}
|
|
|
|
static inline struct device_node *dev_of_node(struct device *dev)
|
|
{
|
|
if (!IS_ENABLED(CONFIG_OF) || !dev)
|
|
return NULL;
|
|
return dev->of_node;
|
|
}
|
|
|
|
/*
|
|
* High level routines for use by the bus drivers
|
|
*/
|
|
extern int __must_check device_register(struct device *dev);
|
|
extern void device_unregister(struct device *dev);
|
|
extern void device_initialize(struct device *dev);
|
|
extern int __must_check device_add(struct device *dev);
|
|
extern void device_del(struct device *dev);
|
|
extern int device_for_each_child(struct device *dev, void *data,
|
|
int (*fn)(struct device *dev, void *data));
|
|
extern int device_for_each_child_reverse(struct device *dev, void *data,
|
|
int (*fn)(struct device *dev, void *data));
|
|
extern struct device *device_find_child(struct device *dev, void *data,
|
|
int (*match)(struct device *dev, void *data));
|
|
extern struct device *device_find_child_by_name(struct device *parent,
|
|
const char *name);
|
|
extern int device_rename(struct device *dev, const char *new_name);
|
|
extern int device_move(struct device *dev, struct device *new_parent,
|
|
enum dpm_order dpm_order);
|
|
extern int device_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid);
|
|
extern const char *device_get_devnode(struct device *dev,
|
|
umode_t *mode, kuid_t *uid, kgid_t *gid,
|
|
const char **tmp);
|
|
|
|
static inline bool device_supports_offline(struct device *dev)
|
|
{
|
|
return dev->bus && dev->bus->offline && dev->bus->online;
|
|
}
|
|
|
|
extern void lock_device_hotplug(void);
|
|
extern void unlock_device_hotplug(void);
|
|
extern int lock_device_hotplug_sysfs(void);
|
|
extern int device_offline(struct device *dev);
|
|
extern int device_online(struct device *dev);
|
|
extern void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
|
|
extern void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
|
|
void device_set_of_node_from_dev(struct device *dev, const struct device *dev2);
|
|
|
|
static inline int dev_num_vf(struct device *dev)
|
|
{
|
|
if (dev->bus && dev->bus->num_vf)
|
|
return dev->bus->num_vf(dev);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Root device objects for grouping under /sys/devices
|
|
*/
|
|
extern struct device *__root_device_register(const char *name,
|
|
struct module *owner);
|
|
|
|
/* This is a macro to avoid include problems with THIS_MODULE */
|
|
#define root_device_register(name) \
|
|
__root_device_register(name, THIS_MODULE)
|
|
|
|
extern void root_device_unregister(struct device *root);
|
|
|
|
static inline void *dev_get_platdata(const struct device *dev)
|
|
{
|
|
return dev->platform_data;
|
|
}
|
|
|
|
/*
|
|
* Manual binding of a device to driver. See drivers/base/bus.c
|
|
* for information on use.
|
|
*/
|
|
extern int __must_check device_bind_driver(struct device *dev);
|
|
extern void device_release_driver(struct device *dev);
|
|
extern int __must_check device_attach(struct device *dev);
|
|
extern int __must_check driver_attach(struct device_driver *drv);
|
|
extern void device_initial_probe(struct device *dev);
|
|
extern int __must_check device_reprobe(struct device *dev);
|
|
|
|
extern bool device_is_bound(struct device *dev);
|
|
|
|
/*
|
|
* Easy functions for dynamically creating devices on the fly
|
|
*/
|
|
extern __printf(5, 0)
|
|
struct device *device_create_vargs(struct class *cls, struct device *parent,
|
|
dev_t devt, void *drvdata,
|
|
const char *fmt, va_list vargs);
|
|
extern __printf(5, 6)
|
|
struct device *device_create(struct class *cls, struct device *parent,
|
|
dev_t devt, void *drvdata,
|
|
const char *fmt, ...);
|
|
extern __printf(6, 7)
|
|
struct device *device_create_with_groups(struct class *cls,
|
|
struct device *parent, dev_t devt, void *drvdata,
|
|
const struct attribute_group **groups,
|
|
const char *fmt, ...);
|
|
extern void device_destroy(struct class *cls, dev_t devt);
|
|
|
|
extern int __must_check device_add_groups(struct device *dev,
|
|
const struct attribute_group **groups);
|
|
extern void device_remove_groups(struct device *dev,
|
|
const struct attribute_group **groups);
|
|
|
|
static inline int __must_check device_add_group(struct device *dev,
|
|
const struct attribute_group *grp)
|
|
{
|
|
const struct attribute_group *groups[] = { grp, NULL };
|
|
|
|
return device_add_groups(dev, groups);
|
|
}
|
|
|
|
static inline void device_remove_group(struct device *dev,
|
|
const struct attribute_group *grp)
|
|
{
|
|
const struct attribute_group *groups[] = { grp, NULL };
|
|
|
|
return device_remove_groups(dev, groups);
|
|
}
|
|
|
|
extern int __must_check devm_device_add_groups(struct device *dev,
|
|
const struct attribute_group **groups);
|
|
extern void devm_device_remove_groups(struct device *dev,
|
|
const struct attribute_group **groups);
|
|
extern int __must_check devm_device_add_group(struct device *dev,
|
|
const struct attribute_group *grp);
|
|
extern void devm_device_remove_group(struct device *dev,
|
|
const struct attribute_group *grp);
|
|
|
|
/*
|
|
* Platform "fixup" functions - allow the platform to have their say
|
|
* about devices and actions that the general device layer doesn't
|
|
* know about.
|
|
*/
|
|
/* Notify platform of device discovery */
|
|
extern int (*platform_notify)(struct device *dev);
|
|
|
|
extern int (*platform_notify_remove)(struct device *dev);
|
|
|
|
|
|
/*
|
|
* get_device - atomically increment the reference count for the device.
|
|
*
|
|
*/
|
|
extern struct device *get_device(struct device *dev);
|
|
extern void put_device(struct device *dev);
|
|
extern bool kill_device(struct device *dev);
|
|
|
|
#ifdef CONFIG_DEVTMPFS
|
|
extern int devtmpfs_mount(void);
|
|
#else
|
|
static inline int devtmpfs_mount(void) { return 0; }
|
|
#endif
|
|
|
|
/* drivers/base/power/shutdown.c */
|
|
extern void device_shutdown(void);
|
|
|
|
/* debugging and troubleshooting/diagnostic helpers. */
|
|
extern const char *dev_driver_string(const struct device *dev);
|
|
|
|
/* Device links interface. */
|
|
struct device_link *device_link_add(struct device *consumer,
|
|
struct device *supplier, u32 flags);
|
|
void device_link_del(struct device_link *link);
|
|
void device_link_remove(void *consumer, struct device *supplier);
|
|
void device_links_supplier_sync_state_pause(void);
|
|
void device_links_supplier_sync_state_resume(void);
|
|
|
|
/* Create alias, so I can be autoloaded. */
|
|
#define MODULE_ALIAS_CHARDEV(major,minor) \
|
|
MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
|
|
#define MODULE_ALIAS_CHARDEV_MAJOR(major) \
|
|
MODULE_ALIAS("char-major-" __stringify(major) "-*")
|
|
|
|
#ifdef CONFIG_SYSFS_DEPRECATED
|
|
extern long sysfs_deprecated;
|
|
#else
|
|
#define sysfs_deprecated 0
|
|
#endif
|
|
|
|
#endif /* _DEVICE_H_ */
|