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USB: Enhance usage of pm_message_t 

This patch (as1177) modifies the USB core suspend and resume
routines.  The resume functions now will take a pm_message_t argument,
so they will know what sort of resume is occurring.  The new argument
is also passed to the port suspend/resume and bus suspend/resume
routines (although they don't use it for anything but debugging).

In addition, special pm_message_t values are used for user-initiated,
device-initiated (i.e., remote wakeup), and automatic suspend/resume.
By testing these values, drivers can tell whether or not a particular
suspend was an autosuspend.  Unfortunately, they can't do the same for
resumes -- not until the pm_message_t argument is also passed to the
drivers' resume methods.  That will require a bigger change.

IMO, the whole Power Management framework should have been set up this
way in the first place.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2008-11-25 16:39:18 -05:00 committed by Greg Kroah-Hartman
parent 4ec06d6296
commit 65bfd2967c
11 changed files with 74 additions and 63 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/usb/class/cdc-acm.c
View File

@ -1275,7 +1275,7 @@ static int acm_suspend(struct usb_interface *intf, pm_message_t message)
struct acm *acm = usb_get_intfdata(intf);
int cnt;
if (acm->dev->auto_pm) {
if (message.event & PM_EVENT_AUTO) {
int b;
spin_lock_irq(&acm->read_lock);

3
drivers/usb/class/cdc-wdm.c
View File

@ -764,7 +764,8 @@ static int wdm_suspend(struct usb_interface *intf, pm_message_t message)
mutex_lock(&desc->plock);
#ifdef CONFIG_PM
if (interface_to_usbdev(desc->intf)->auto_pm && test_bit(WDM_IN_USE, &desc->flags)) {
if ((message.event & PM_EVENT_AUTO) &&
test_bit(WDM_IN_USE, &desc->flags)) {
rv = -EBUSY;
} else {
#endif

61
drivers/usb/core/driver.c
View File

@ -922,7 +922,7 @@ static int usb_suspend_device(struct usb_device *udev, pm_message_t msg)
}
/* Caller has locked udev's pm_mutex */
static int usb_resume_device(struct usb_device *udev)
static int usb_resume_device(struct usb_device *udev, pm_message_t msg)
{
struct usb_device_driver *udriver;
int status = 0;
@ -940,7 +940,7 @@ static int usb_resume_device(struct usb_device *udev)
udev->reset_resume = 1;
udriver = to_usb_device_driver(udev->dev.driver);
status = udriver->resume(udev);
status = udriver->resume(udev, msg);
done:
dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status);
@ -969,7 +969,7 @@ static int usb_suspend_interface(struct usb_device *udev,
status = driver->suspend(intf, msg);
if (status == 0)
mark_quiesced(intf);
else if (!udev->auto_pm)
else if (!(msg.event & PM_EVENT_AUTO))
dev_err(&intf->dev, "%s error %d\n",
"suspend", status);
} else {
@ -987,7 +987,7 @@ static int usb_suspend_interface(struct usb_device *udev,
/* Caller has locked intf's usb_device's pm_mutex */
static int usb_resume_interface(struct usb_device *udev,
struct usb_interface *intf, int reset_resume)
struct usb_interface *intf, pm_message_t msg, int reset_resume)
{
struct usb_driver *driver;
int status = 0;
@ -1138,10 +1138,9 @@ static inline int autosuspend_check(struct usb_device *udev, int reschedule)
* all the interfaces which were suspended are resumed so that they remain
* in the same state as the device.
*
* If an autosuspend is in progress (@udev->auto_pm is set), the routine
* checks first to make sure that neither the device itself or any of its
* active interfaces is in use (pm_usage_cnt is greater than 0). If they
* are, the autosuspend fails.
* If an autosuspend is in progress the routine checks first to make sure
* that neither the device itself or any of its active interfaces is in use
* (pm_usage_cnt is greater than 0). If they are, the autosuspend fails.
*
* If the suspend succeeds, the routine recursively queues an autosuspend
* request for @udev's parent device, thereby propagating the change up
@ -1176,7 +1175,7 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg)
udev->do_remote_wakeup = device_may_wakeup(&udev->dev);
if (udev->auto_pm) {
if (msg.event & PM_EVENT_AUTO) {
status = autosuspend_check(udev, 0);
if (status < 0)
goto done;
@ -1196,13 +1195,16 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg)
/* If the suspend failed, resume interfaces that did get suspended */
if (status != 0) {
pm_message_t msg2;
msg2.event = msg.event ^ (PM_EVENT_SUSPEND | PM_EVENT_RESUME);
while (--i >= 0) {
intf = udev->actconfig->interface[i];
usb_resume_interface(udev, intf, 0);
usb_resume_interface(udev, intf, msg2, 0);
}
/* Try another autosuspend when the interfaces aren't busy */
if (udev->auto_pm)
if (msg.event & PM_EVENT_AUTO)
autosuspend_check(udev, status == -EBUSY);
/* If the suspend succeeded then prevent any more URB submissions,
@ -1232,6 +1234,7 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg)
/**
* usb_resume_both - resume a USB device and its interfaces
* @udev: the usb_device to resume
* @msg: Power Management message describing this state transition
*
* This is the central routine for resuming USB devices. It calls the
* the resume method for @udev and then calls the resume methods for all
@ -1257,7 +1260,7 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg)
*
* This routine can run only in process context.
*/
static int usb_resume_both(struct usb_device *udev)
static int usb_resume_both(struct usb_device *udev, pm_message_t msg)
{
int status = 0;
int i;
@ -1273,14 +1276,15 @@ static int usb_resume_both(struct usb_device *udev)
/* Propagate the resume up the tree, if necessary */
if (udev->state == USB_STATE_SUSPENDED) {
if (udev->auto_pm && udev->autoresume_disabled) {
if ((msg.event & PM_EVENT_AUTO) &&
udev->autoresume_disabled) {
status = -EPERM;
goto done;
}
if (parent) {
status = usb_autoresume_device(parent);
if (status == 0) {
status = usb_resume_device(udev);
status = usb_resume_device(udev, msg);
if (status || udev->state ==
USB_STATE_NOTATTACHED) {
usb_autosuspend_device(parent);
@ -1303,15 +1307,16 @@ static int usb_resume_both(struct usb_device *udev)
/* We can't progagate beyond the USB subsystem,
* so if a root hub's controller is suspended
* then we're stuck. */
status = usb_resume_device(udev);
status = usb_resume_device(udev, msg);
}
} else if (udev->reset_resume)
status = usb_resume_device(udev);
status = usb_resume_device(udev, msg);
if (status == 0 && udev->actconfig) {
for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
intf = udev->actconfig->interface[i];
usb_resume_interface(udev, intf, udev->reset_resume);
usb_resume_interface(udev, intf, msg,
udev->reset_resume);
}
}
@ -1339,13 +1344,13 @@ static int usb_autopm_do_device(struct usb_device *udev, int inc_usage_cnt)
udev->last_busy = jiffies;
if (inc_usage_cnt >= 0 && udev->pm_usage_cnt > 0) {
if (udev->state == USB_STATE_SUSPENDED)
status = usb_resume_both(udev);
status = usb_resume_both(udev, PMSG_AUTO_RESUME);
if (status != 0)
udev->pm_usage_cnt -= inc_usage_cnt;
else if (inc_usage_cnt)
udev->last_busy = jiffies;
} else if (inc_usage_cnt <= 0 && udev->pm_usage_cnt <= 0) {
status = usb_suspend_both(udev, PMSG_SUSPEND);
status = usb_suspend_both(udev, PMSG_AUTO_SUSPEND);
}
usb_pm_unlock(udev);
return status;
@ -1469,13 +1474,14 @@ static int usb_autopm_do_interface(struct usb_interface *intf,
udev->last_busy = jiffies;
if (inc_usage_cnt >= 0 && intf->pm_usage_cnt > 0) {
if (udev->state == USB_STATE_SUSPENDED)
status = usb_resume_both(udev);
status = usb_resume_both(udev,
PMSG_AUTO_RESUME);
if (status != 0)
intf->pm_usage_cnt -= inc_usage_cnt;
else
udev->last_busy = jiffies;
} else if (inc_usage_cnt <= 0 && intf->pm_usage_cnt <= 0) {
status = usb_suspend_both(udev, PMSG_SUSPEND);
status = usb_suspend_both(udev, PMSG_AUTO_SUSPEND);
}
}
usb_pm_unlock(udev);
@ -1700,6 +1706,7 @@ int usb_external_suspend_device(struct usb_device *udev, pm_message_t msg)
/**
* usb_external_resume_device - external resume of a USB device and its interfaces
* @udev: the usb_device to resume
* @msg: Power Management message describing this state transition
*
* This routine handles external resume requests: ones not generated
* internally by a USB driver (autoresume) but rather coming from the user
@ -1708,13 +1715,13 @@ int usb_external_suspend_device(struct usb_device *udev, pm_message_t msg)
*
* The caller must hold @udev's device lock.
*/
int usb_external_resume_device(struct usb_device *udev)
int usb_external_resume_device(struct usb_device *udev, pm_message_t msg)
{
int status;
usb_pm_lock(udev);
udev->auto_pm = 0;
status = usb_resume_both(udev);
status = usb_resume_both(udev, msg);
udev->last_busy = jiffies;
usb_pm_unlock(udev);
if (status == 0)
@ -1727,7 +1734,7 @@ int usb_external_resume_device(struct usb_device *udev)
return status;
}
int usb_suspend(struct device *dev, pm_message_t message)
int usb_suspend(struct device *dev, pm_message_t msg)
{
struct usb_device *udev;
@ -1746,10 +1753,10 @@ int usb_suspend(struct device *dev, pm_message_t message)
}
udev->skip_sys_resume = 0;
return usb_external_suspend_device(udev, message);
return usb_external_suspend_device(udev, msg);
}
int usb_resume(struct device *dev)
int usb_resume(struct device *dev, pm_message_t msg)
{
struct usb_device *udev;
@ -1761,7 +1768,7 @@ int usb_resume(struct device *dev)
*/
if (udev->skip_sys_resume)
return 0;
return usb_external_resume_device(udev);
return usb_external_resume_device(udev, msg);
}
#endif /* CONFIG_PM */

10
drivers/usb/core/generic.c
View File

@ -200,18 +200,18 @@ static int generic_suspend(struct usb_device *udev, pm_message_t msg)
* interfaces manually by doing a bus (or "global") suspend.
*/
if (!udev->parent)
rc = hcd_bus_suspend(udev);
rc = hcd_bus_suspend(udev, msg);
/* Non-root devices don't need to do anything for FREEZE or PRETHAW */
else if (msg.event == PM_EVENT_FREEZE || msg.event == PM_EVENT_PRETHAW)
rc = 0;
else
rc = usb_port_suspend(udev);
rc = usb_port_suspend(udev, msg);
return rc;
}
static int generic_resume(struct usb_device *udev)
static int generic_resume(struct usb_device *udev, pm_message_t msg)
{
int rc;
@ -221,9 +221,9 @@ static int generic_resume(struct usb_device *udev)
* interfaces manually by doing a bus (or "global") resume.
*/
if (!udev->parent)
rc = hcd_bus_resume(udev);
rc = hcd_bus_resume(udev, msg);
else
rc = usb_port_resume(udev);
rc = usb_port_resume(udev, msg);
return rc;
}

10
drivers/usb/core/hcd.c
View File

@ -1573,14 +1573,14 @@ int usb_hcd_get_frame_number (struct usb_device *udev)
#ifdef CONFIG_PM
int hcd_bus_suspend(struct usb_device *rhdev)
int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg)
{
struct usb_hcd *hcd = container_of(rhdev->bus, struct usb_hcd, self);
int status;
int old_state = hcd->state;
dev_dbg(&rhdev->dev, "bus %s%s\n",
rhdev->auto_pm ? "auto-" : "", "suspend");
(msg.event & PM_EVENT_AUTO ? "auto-" : ""), "suspend");
if (!hcd->driver->bus_suspend) {
status = -ENOENT;
} else {
@ -1598,14 +1598,14 @@ int hcd_bus_suspend(struct usb_device *rhdev)
return status;
}
int hcd_bus_resume(struct usb_device *rhdev)
int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
{
struct usb_hcd *hcd = container_of(rhdev->bus, struct usb_hcd, self);
int status;
int old_state = hcd->state;
dev_dbg(&rhdev->dev, "usb %s%s\n",
rhdev->auto_pm ? "auto-" : "", "resume");
(msg.event & PM_EVENT_AUTO ? "auto-" : ""), "resume");
if (!hcd->driver->bus_resume)
return -ENOENT;
if (hcd->state == HC_STATE_RUNNING)
@ -1638,7 +1638,7 @@ static void hcd_resume_work(struct work_struct *work)
usb_lock_device(udev);
usb_mark_last_busy(udev);
usb_external_resume_device(udev);
usb_external_resume_device(udev, PMSG_REMOTE_RESUME);
usb_unlock_device(udev);
}

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

@ -388,8 +388,8 @@ extern int usb_find_interface_driver(struct usb_device *dev,
#ifdef CONFIG_PM
extern void usb_hcd_resume_root_hub(struct usb_hcd *hcd);
extern void usb_root_hub_lost_power(struct usb_device *rhdev);
extern int hcd_bus_suspend(struct usb_device *rhdev);
extern int hcd_bus_resume(struct usb_device *rhdev);
extern int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg);
extern int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg);
#else
static inline void usb_hcd_resume_root_hub(struct usb_hcd *hcd)
{

16
drivers/usb/core/hub.c
View File

@ -1984,7 +1984,7 @@ static int check_port_resume_type(struct usb_device *udev,
*
* Returns 0 on success, else negative errno.
*/
int usb_port_suspend(struct usb_device *udev)
int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
{
struct usb_hub *hub = hdev_to_hub(udev->parent);
int port1 = udev->portnum;
@ -2023,7 +2023,7 @@ int usb_port_suspend(struct usb_device *udev)
} else {
/* device has up to 10 msec to fully suspend */
dev_dbg(&udev->dev, "usb %ssuspend\n",
udev->auto_pm ? "auto-" : "");
(msg.event & PM_EVENT_AUTO ? "auto-" : ""));
usb_set_device_state(udev, USB_STATE_SUSPENDED);
msleep(10);
}
@ -2142,7 +2142,7 @@ static int finish_port_resume(struct usb_device *udev)
*
* Returns 0 on success, else negative errno.
*/
int usb_port_resume(struct usb_device *udev)
int usb_port_resume(struct usb_device *udev, pm_message_t msg)
{
struct usb_hub *hub = hdev_to_hub(udev->parent);
int port1 = udev->portnum;
@ -2167,7 +2167,7 @@ int usb_port_resume(struct usb_device *udev)
} else {
/* drive resume for at least 20 msec */
dev_dbg(&udev->dev, "usb %sresume\n",
udev->auto_pm ? "auto-" : "");
(msg.event & PM_EVENT_AUTO ? "auto-" : ""));
msleep(25);
/* Virtual root hubs can trigger on GET_PORT_STATUS to
@ -2208,7 +2208,7 @@ static int remote_wakeup(struct usb_device *udev)
if (udev->state == USB_STATE_SUSPENDED) {
dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
usb_mark_last_busy(udev);
status = usb_external_resume_device(udev);
status = usb_external_resume_device(udev, PMSG_REMOTE_RESUME);
}
return status;
}
@ -2217,14 +2217,14 @@ static int remote_wakeup(struct usb_device *udev)
/* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
int usb_port_suspend(struct usb_device *udev)
int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
{
return 0;
}
/* However we may need to do a reset-resume */
int usb_port_resume(struct usb_device *udev)
int usb_port_resume(struct usb_device *udev, pm_message_t msg)
{
struct usb_hub *hub = hdev_to_hub(udev->parent);
int port1 = udev->portnum;
@ -2264,7 +2264,7 @@ static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
udev = hdev->children [port1-1];
if (udev && udev->can_submit) {
if (!hdev->auto_pm)
if (!(msg.event & PM_EVENT_AUTO))
dev_dbg(&intf->dev, "port %d nyet suspended\n",
port1);
return -EBUSY;

6
drivers/usb/core/sysfs.c
View File

@ -359,19 +359,19 @@ set_level(struct device *dev, struct device_attribute *attr,
strncmp(buf, on_string, len) == 0) {
udev->autosuspend_disabled = 1;
udev->autoresume_disabled = 0;
rc = usb_external_resume_device(udev);
rc = usb_external_resume_device(udev, PMSG_USER_RESUME);
} else if (len == sizeof auto_string - 1 &&
strncmp(buf, auto_string, len) == 0) {
udev->autosuspend_disabled = 0;
udev->autoresume_disabled = 0;
rc = usb_external_resume_device(udev);
rc = usb_external_resume_device(udev, PMSG_USER_RESUME);
} else if (len == sizeof suspend_string - 1 &&
strncmp(buf, suspend_string, len) == 0) {
udev->autosuspend_disabled = 0;
udev->autoresume_disabled = 1;
rc = usb_external_suspend_device(udev, PMSG_SUSPEND);
rc = usb_external_suspend_device(udev, PMSG_USER_SUSPEND);
} else
rc = -EINVAL;

8
drivers/usb/core/usb.c
View File

@ -253,7 +253,7 @@ static int usb_dev_prepare(struct device *dev)
static void usb_dev_complete(struct device *dev)
{
/* Currently used only for rebinding interfaces */
usb_resume(dev); /* Implement eventually? */
usb_resume(dev, PMSG_RESUME); /* Message event is meaningless */
}
static int usb_dev_suspend(struct device *dev)
@ -263,7 +263,7 @@ static int usb_dev_suspend(struct device *dev)
static int usb_dev_resume(struct device *dev)
{
return usb_resume(dev);
return usb_resume(dev, PMSG_RESUME);
}
static int usb_dev_freeze(struct device *dev)
@ -273,7 +273,7 @@ static int usb_dev_freeze(struct device *dev)
static int usb_dev_thaw(struct device *dev)
{
return usb_resume(dev);
return usb_resume(dev, PMSG_THAW);
}
static int usb_dev_poweroff(struct device *dev)
@ -283,7 +283,7 @@ static int usb_dev_poweroff(struct device *dev)
static int usb_dev_restore(struct device *dev)
{
return usb_resume(dev);
return usb_resume(dev, PMSG_RESTORE);
}
static struct dev_pm_ops usb_device_pm_ops = {

15
drivers/usb/core/usb.h
View File

@ -1,3 +1,5 @@
#include <linux/pm.h>
/* Functions local to drivers/usb/core/ */
extern int usb_create_sysfs_dev_files(struct usb_device *dev);
@ -42,15 +44,16 @@ extern void usb_host_cleanup(void);
#ifdef CONFIG_PM
extern int usb_suspend(struct device *dev, pm_message_t msg);
extern int usb_resume(struct device *dev);
extern int usb_resume(struct device *dev, pm_message_t msg);
extern void usb_autosuspend_work(struct work_struct *work);
extern void usb_autoresume_work(struct work_struct *work);
extern int usb_port_suspend(struct usb_device *dev);
extern int usb_port_resume(struct usb_device *dev);
extern int usb_port_suspend(struct usb_device *dev, pm_message_t msg);
extern int usb_port_resume(struct usb_device *dev, pm_message_t msg);
extern int usb_external_suspend_device(struct usb_device *udev,
pm_message_t msg);
extern int usb_external_resume_device(struct usb_device *udev);
extern int usb_external_resume_device(struct usb_device *udev,
pm_message_t msg);
static inline void usb_pm_lock(struct usb_device *udev)
{
@ -64,12 +67,12 @@ static inline void usb_pm_unlock(struct usb_device *udev)
#else
static inline int usb_port_suspend(struct usb_device *udev)
static inline int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
{
return 0;
}
static inline int usb_port_resume(struct usb_device *udev)
static inline int usb_port_resume(struct usb_device *udev, pm_message_t msg)
{
return 0;
}

2
include/linux/usb.h
View File

@ -1067,7 +1067,7 @@ struct usb_device_driver {
void (*disconnect) (struct usb_device *udev);
int (*suspend) (struct usb_device *udev, pm_message_t message);
int (*resume) (struct usb_device *udev);
int (*resume) (struct usb_device *udev, pm_message_t message);
struct usbdrv_wrap drvwrap;
unsigned int supports_autosuspend:1;
};