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usb: core: add sysfs entry for usb device state

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Expose usb device state to userland as the information is useful in
detecting non-compliant setups and diagnosing enumeration failures.
For example:
- End-to-end signal integrity issues: the device would fail port reset
  repeatedly and thus be stuck in POWERED state.
- Charge-only cables (missing D+/D- lines): the device would never enter
  POWERED state as the HC would not see any pullup.

What's the status quo?
We do have error logs such as "Cannot enable. Maybe the USB cable is bad?"
to flag potential setup issues, but there's no good way to expose them to
userspace.

Why add a sysfs entry in struct usb_port instead of struct usb_device?
The struct usb_device is not device_add() to the system until it's in
ADDRESS state hence we would miss the first two states. The struct
usb_port is a better place to keep the information because its life
cycle is longer than the struct usb_device that is attached to the port.

Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202306042228.e532af6e-oliver.sang@intel.com
Reviewed-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Roy Luo <royluo@google.com>
Message-ID: <20230608015913.1679984-1-royluo@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Roy Luo 2023-06-08 01:59:12 +00:00 committed by Greg Kroah-Hartman
parent edd60d24bd
commit 83cb2604f6
4 changed files with 57 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
Documentation/ABI/testing/sysfs-bus-usb
View File

@ -292,6 +292,16 @@ Description:
which is marked with early_stop has failed to initialize, it will ignore
all future connections until this attribute is clear.
What: /sys/bus/usb/devices/.../<hub_interface>/port<X>/state
Date: June 2023
Contact: Roy Luo <royluo@google.com>
Description:
Indicates current state of the USB device attached to the port.
Valid states are: 'not-attached', 'attached', 'powered',
'reconnecting', 'unauthenticated', 'default', 'addressed',
'configured', and 'suspended'. This file supports poll() to
monitor the state change from user space.
What: /sys/bus/usb/devices/.../power/usb2_lpm_l1_timeout
Date: May 2013
Contact: Mathias Nyman <mathias.nyman@linux.intel.com>

15
drivers/usb/core/hub.c
View File

@ -2018,6 +2018,19 @@ bool usb_device_is_owned(struct usb_device *udev)
return !!hub->ports[udev->portnum - 1]->port_owner;
}
static void update_port_device_state(struct usb_device *udev)
{
struct usb_hub *hub;
struct usb_port *port_dev;
if (udev->parent) {
hub = usb_hub_to_struct_hub(udev->parent);
port_dev = hub->ports[udev->portnum - 1];
WRITE_ONCE(port_dev->state, udev->state);
sysfs_notify_dirent(port_dev->state_kn);
}
}
static void recursively_mark_NOTATTACHED(struct usb_device *udev)
{
struct usb_hub *hub = usb_hub_to_struct_hub(udev);
@ -2030,6 +2043,7 @@ static void recursively_mark_NOTATTACHED(struct usb_device *udev)
if (udev->state == USB_STATE_SUSPENDED)
udev->active_duration -= jiffies;
udev->state = USB_STATE_NOTATTACHED;
update_port_device_state(udev);
}
/**
@ -2086,6 +2100,7 @@ void usb_set_device_state(struct usb_device *udev,
udev->state != USB_STATE_SUSPENDED)
udev->active_duration += jiffies;
udev->state = new_state;
update_port_device_state(udev);
} else
recursively_mark_NOTATTACHED(udev);
spin_unlock_irqrestore(&device_state_lock, flags);

4
drivers/usb/core/hub.h
View File

@ -84,6 +84,8 @@ struct usb_hub {
* @peer: related usb2 and usb3 ports (share the same connector)
* @req: default pm qos request for hubs without port power control
* @connect_type: port's connect type
* @state: device state of the usb device attached to the port
* @state_kn: kernfs_node of the sysfs attribute that accesses @state
* @location: opaque representation of platform connector location
* @status_lock: synchronize port_event() vs usb_port_{suspend|resume}
* @portnum: port index num based one
@ -100,6 +102,8 @@ struct usb_port {
struct usb_port *peer;
struct dev_pm_qos_request *req;
enum usb_port_connect_type connect_type;
enum usb_device_state state;
struct kernfs_node *state_kn;
usb_port_location_t location;
struct mutex status_lock;
u32 over_current_count;

32
drivers/usb/core/port.c
View File

@ -160,6 +160,16 @@ static ssize_t connect_type_show(struct device *dev,
}
static DEVICE_ATTR_RO(connect_type);
static ssize_t state_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct usb_port *port_dev = to_usb_port(dev);
enum usb_device_state state = READ_ONCE(port_dev->state);
return sysfs_emit(buf, "%s\n", usb_state_string(state));
}
static DEVICE_ATTR_RO(state);
static ssize_t over_current_count_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@ -259,6 +269,7 @@ static DEVICE_ATTR_RW(usb3_lpm_permit);
static struct attribute *port_dev_attrs[] = {
&dev_attr_connect_type.attr,
&dev_attr_state.attr,
&dev_attr_location.attr,
&dev_attr_quirks.attr,
&dev_attr_over_current_count.attr,
@ -705,19 +716,24 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1)
return retval;
}
port_dev->state_kn = sysfs_get_dirent(port_dev->dev.kobj.sd, "state");
if (!port_dev->state_kn) {
dev_err(&port_dev->dev, "failed to sysfs_get_dirent 'state'\n");
retval = -ENODEV;
goto err_unregister;
}
/* Set default policy of port-poweroff disabled. */
retval = dev_pm_qos_add_request(&port_dev->dev, port_dev->req,
DEV_PM_QOS_FLAGS, PM_QOS_FLAG_NO_POWER_OFF);
if (retval < 0) {
device_unregister(&port_dev->dev);
return retval;
goto err_put_kn;
}
retval = component_add(&port_dev->dev, &connector_ops);
if (retval) {
dev_warn(&port_dev->dev, "failed to add component\n");
device_unregister(&port_dev->dev);
return retval;
goto err_put_kn;
}
find_and_link_peer(hub, port1);
@ -754,6 +770,13 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1)
port_dev->req = NULL;
}
return 0;
err_put_kn:
sysfs_put(port_dev->state_kn);
err_unregister:
device_unregister(&port_dev->dev);
return retval;
}
void usb_hub_remove_port_device(struct usb_hub *hub, int port1)
@ -765,5 +788,6 @@ void usb_hub_remove_port_device(struct usb_hub *hub, int port1)
if (peer)
unlink_peers(port_dev, peer);
component_del(&port_dev->dev, &connector_ops);
sysfs_put(port_dev->state_kn);
device_unregister(&port_dev->dev);
}