* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6: (23 commits)
at_hdmac: Rework suspend_late()/resume_early()
PM: Reset transition_started at dpm_resume_noirq
PM: Update kerneldoc comments in drivers/base/power/main.c
PM: Add convenience macro to make switching to dev_pm_ops less error-prone
hp-wmi: Switch driver to dev_pm_ops
floppy: Switch driver to dev_pm_ops
PM: Trivial fixes
PM / Hibernate / Memory hotplug: Always use for_each_populated_zone()
PM/Hibernate: Do not try to allocate too much memory too hard (rev. 2)
PM/Hibernate: Do not release preallocated memory unnecessarily (rev. 2)
PM/Hibernate: Rework shrinking of memory
PM: Fix typo in label name s/Platofrm_finish/Platform_finish/
PM: Run-time PM platform device bus support
PM: Introduce core framework for run-time PM of I/O devices (rev. 17)
Driver Core: Make PM operations a const pointer
PM: Remove platform device suspend_late()/resume_early() V2
USB: Rework musb suspend()/resume_early()
I2C: Rework i2c-s3c2410 suspend_late()/resume() V2
I2C: Rework i2c-pxa suspend_late()/resume_early()
DMA: Rework txx9dmac suspend_late()/resume_early()
...
Fix trivial conflict in drivers/base/platform.c (due to same
constification patch being merged in both sides, along with some other
PM work in the PM branch)
--- /dev/null
+Run-time Power Management Framework for I/O Devices
+
+(C) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
+
+1. Introduction
+
+Support for run-time power management (run-time PM) of I/O devices is provided
+at the power management core (PM core) level by means of:
+
+* The power management workqueue pm_wq in which bus types and device drivers can
+ put their PM-related work items. It is strongly recommended that pm_wq be
+ used for queuing all work items related to run-time PM, because this allows
+ them to be synchronized with system-wide power transitions (suspend to RAM,
+ hibernation and resume from system sleep states). pm_wq is declared in
+ include/linux/pm_runtime.h and defined in kernel/power/main.c.
+
+* A number of run-time PM fields in the 'power' member of 'struct device' (which
+ is of the type 'struct dev_pm_info', defined in include/linux/pm.h) that can
+ be used for synchronizing run-time PM operations with one another.
+
+* Three device run-time PM callbacks in 'struct dev_pm_ops' (defined in
+ include/linux/pm.h).
+
+* A set of helper functions defined in drivers/base/power/runtime.c that can be
+ used for carrying out run-time PM operations in such a way that the
+ synchronization between them is taken care of by the PM core. Bus types and
+ device drivers are encouraged to use these functions.
+
+The run-time PM callbacks present in 'struct dev_pm_ops', the device run-time PM
+fields of 'struct dev_pm_info' and the core helper functions provided for
+run-time PM are described below.
+
+2. Device Run-time PM Callbacks
+
+There are three device run-time PM callbacks defined in 'struct dev_pm_ops':
+
+struct dev_pm_ops {
+ ...
+ int (*runtime_suspend)(struct device *dev);
+ int (*runtime_resume)(struct device *dev);
+ void (*runtime_idle)(struct device *dev);
+ ...
+};
+
+The ->runtime_suspend() callback is executed by the PM core for the bus type of
+the device being suspended. The bus type's callback is then _entirely_
+_responsible_ for handling the device as appropriate, which may, but need not
+include executing the device driver's own ->runtime_suspend() callback (from the
+PM core's point of view it is not necessary to implement a ->runtime_suspend()
+callback in a device driver as long as the bus type's ->runtime_suspend() knows
+what to do to handle the device).
+
+ * Once the bus type's ->runtime_suspend() callback has completed successfully
+ for given device, the PM core regards the device as suspended, which need
+ not mean that the device has been put into a low power state. It is
+ supposed to mean, however, that the device will not process data and will
+ not communicate with the CPU(s) and RAM until its bus type's
+ ->runtime_resume() callback is executed for it. The run-time PM status of
+ a device after successful execution of its bus type's ->runtime_suspend()
+ callback is 'suspended'.
+
+ * If the bus type's ->runtime_suspend() callback returns -EBUSY or -EAGAIN,
+ the device's run-time PM status is supposed to be 'active', which means that
+ the device _must_ be fully operational afterwards.
+
+ * If the bus type's ->runtime_suspend() callback returns an error code
+ different from -EBUSY or -EAGAIN, the PM core regards this as a fatal
+ error and will refuse to run the helper functions described in Section 4
+ for the device, until the status of it is directly set either to 'active'
+ or to 'suspended' (the PM core provides special helper functions for this
+ purpose).
+
+In particular, if the driver requires remote wakeup capability for proper
+functioning and device_may_wakeup() returns 'false' for the device, then
+->runtime_suspend() should return -EBUSY. On the other hand, if
+device_may_wakeup() returns 'true' for the device and the device is put
+into a low power state during the execution of its bus type's
+->runtime_suspend(), it is expected that remote wake-up (i.e. hardware mechanism
+allowing the device to request a change of its power state, such as PCI PME)
+will be enabled for the device. Generally, remote wake-up should be enabled
+for all input devices put into a low power state at run time.
+
+The ->runtime_resume() callback is executed by the PM core for the bus type of
+the device being woken up. The bus type's callback is then _entirely_
+_responsible_ for handling the device as appropriate, which may, but need not
+include executing the device driver's own ->runtime_resume() callback (from the
+PM core's point of view it is not necessary to implement a ->runtime_resume()
+callback in a device driver as long as the bus type's ->runtime_resume() knows
+what to do to handle the device).
+
+ * Once the bus type's ->runtime_resume() callback has completed successfully,
+ the PM core regards the device as fully operational, which means that the
+ device _must_ be able to complete I/O operations as needed. The run-time
+ PM status of the device is then 'active'.
+
+ * If the bus type's ->runtime_resume() callback returns an error code, the PM
+ core regards this as a fatal error and will refuse to run the helper
+ functions described in Section 4 for the device, until its status is
+ directly set either to 'active' or to 'suspended' (the PM core provides
+ special helper functions for this purpose).
+
+The ->runtime_idle() callback is executed by the PM core for the bus type of
+given device whenever the device appears to be idle, which is indicated to the
+PM core by two counters, the device's usage counter and the counter of 'active'
+children of the device.
+
+ * If any of these counters is decreased using a helper function provided by
+ the PM core and it turns out to be equal to zero, the other counter is
+ checked. If that counter also is equal to zero, the PM core executes the
+ device bus type's ->runtime_idle() callback (with the device as an
+ argument).
+
+The action performed by a bus type's ->runtime_idle() callback is totally
+dependent on the bus type in question, but the expected and recommended action
+is to check if the device can be suspended (i.e. if all of the conditions
+necessary for suspending the device are satisfied) and to queue up a suspend
+request for the device in that case.
+
+The helper functions provided by the PM core, described in Section 4, guarantee
+that the following constraints are met with respect to the bus type's run-time
+PM callbacks:
+
+(1) The callbacks are mutually exclusive (e.g. it is forbidden to execute
+ ->runtime_suspend() in parallel with ->runtime_resume() or with another
+ instance of ->runtime_suspend() for the same device) with the exception that
+ ->runtime_suspend() or ->runtime_resume() can be executed in parallel with
+ ->runtime_idle() (although ->runtime_idle() will not be started while any
+ of the other callbacks is being executed for the same device).
+
+(2) ->runtime_idle() and ->runtime_suspend() can only be executed for 'active'
+ devices (i.e. the PM core will only execute ->runtime_idle() or
+ ->runtime_suspend() for the devices the run-time PM status of which is
+ 'active').
+
+(3) ->runtime_idle() and ->runtime_suspend() can only be executed for a device
+ the usage counter of which is equal to zero _and_ either the counter of
+ 'active' children of which is equal to zero, or the 'power.ignore_children'
+ flag of which is set.
+
+(4) ->runtime_resume() can only be executed for 'suspended' devices (i.e. the
+ PM core will only execute ->runtime_resume() for the devices the run-time
+ PM status of which is 'suspended').
+
+Additionally, the helper functions provided by the PM core obey the following
+rules:
+
+ * If ->runtime_suspend() is about to be executed or there's a pending request
+ to execute it, ->runtime_idle() will not be executed for the same device.
+
+ * A request to execute or to schedule the execution of ->runtime_suspend()
+ will cancel any pending requests to execute ->runtime_idle() for the same
+ device.
+
+ * If ->runtime_resume() is about to be executed or there's a pending request
+ to execute it, the other callbacks will not be executed for the same device.
+
+ * A request to execute ->runtime_resume() will cancel any pending or
+ scheduled requests to execute the other callbacks for the same device.
+
+3. Run-time PM Device Fields
+
+The following device run-time PM fields are present in 'struct dev_pm_info', as
+defined in include/linux/pm.h:
+
+ struct timer_list suspend_timer;
+ - timer used for scheduling (delayed) suspend request
+
+ unsigned long timer_expires;
+ - timer expiration time, in jiffies (if this is different from zero, the
+ timer is running and will expire at that time, otherwise the timer is not
+ running)
+
+ struct work_struct work;
+ - work structure used for queuing up requests (i.e. work items in pm_wq)
+
+ wait_queue_head_t wait_queue;
+ - wait queue used if any of the helper functions needs to wait for another
+ one to complete
+
+ spinlock_t lock;
+ - lock used for synchronisation
+
+ atomic_t usage_count;
+ - the usage counter of the device
+
+ atomic_t child_count;
+ - the count of 'active' children of the device
+
+ unsigned int ignore_children;
+ - if set, the value of child_count is ignored (but still updated)
+
+ unsigned int disable_depth;
+ - used for disabling the helper funcions (they work normally if this is
+ equal to zero); the initial value of it is 1 (i.e. run-time PM is
+ initially disabled for all devices)
+
+ unsigned int runtime_error;
+ - if set, there was a fatal error (one of the callbacks returned error code
+ as described in Section 2), so the helper funtions will not work until
+ this flag is cleared; this is the error code returned by the failing
+ callback
+
+ unsigned int idle_notification;
+ - if set, ->runtime_idle() is being executed
+
+ unsigned int request_pending;
+ - if set, there's a pending request (i.e. a work item queued up into pm_wq)
+
+ enum rpm_request request;
+ - type of request that's pending (valid if request_pending is set)
+
+ unsigned int deferred_resume;
+ - set if ->runtime_resume() is about to be run while ->runtime_suspend() is
+ being executed for that device and it is not practical to wait for the
+ suspend to complete; means "start a resume as soon as you've suspended"
+
+ enum rpm_status runtime_status;
+ - the run-time PM status of the device; this field's initial value is
+ RPM_SUSPENDED, which means that each device is initially regarded by the
+ PM core as 'suspended', regardless of its real hardware status
+
+All of the above fields are members of the 'power' member of 'struct device'.
+
+4. Run-time PM Device Helper Functions
+
+The following run-time PM helper functions are defined in
+drivers/base/power/runtime.c and include/linux/pm_runtime.h:
+
+ void pm_runtime_init(struct device *dev);
+ - initialize the device run-time PM fields in 'struct dev_pm_info'
+
+ void pm_runtime_remove(struct device *dev);
+ - make sure that the run-time PM of the device will be disabled after
+ removing the device from device hierarchy
+
+ int pm_runtime_idle(struct device *dev);
+ - execute ->runtime_idle() for the device's bus type; returns 0 on success
+ or error code on failure, where -EINPROGRESS means that ->runtime_idle()
+ is already being executed
+
+ int pm_runtime_suspend(struct device *dev);
+ - execute ->runtime_suspend() for the device's bus type; returns 0 on
+ success, 1 if the device's run-time PM status was already 'suspended', or
+ error code on failure, where -EAGAIN or -EBUSY means it is safe to attempt
+ to suspend the device again in future
+
+ int pm_runtime_resume(struct device *dev);
+ - execute ->runtime_resume() for the device's bus type; returns 0 on
+ success, 1 if the device's run-time PM status was already 'active' or
+ error code on failure, where -EAGAIN means it may be safe to attempt to
+ resume the device again in future, but 'power.runtime_error' should be
+ checked additionally
+
+ int pm_request_idle(struct device *dev);
+ - submit a request to execute ->runtime_idle() for the device's bus type
+ (the request is represented by a work item in pm_wq); returns 0 on success
+ or error code if the request has not been queued up
+
+ int pm_schedule_suspend(struct device *dev, unsigned int delay);
+ - schedule the execution of ->runtime_suspend() for the device's bus type
+ in future, where 'delay' is the time to wait before queuing up a suspend
+ work item in pm_wq, in milliseconds (if 'delay' is zero, the work item is
+ queued up immediately); returns 0 on success, 1 if the device's PM
+ run-time status was already 'suspended', or error code if the request
+ hasn't been scheduled (or queued up if 'delay' is 0); if the execution of
+ ->runtime_suspend() is already scheduled and not yet expired, the new
+ value of 'delay' will be used as the time to wait
+
+ int pm_request_resume(struct device *dev);
+ - submit a request to execute ->runtime_resume() for the device's bus type
+ (the request is represented by a work item in pm_wq); returns 0 on
+ success, 1 if the device's run-time PM status was already 'active', or
+ error code if the request hasn't been queued up
+
+ void pm_runtime_get_noresume(struct device *dev);
+ - increment the device's usage counter
+
+ int pm_runtime_get(struct device *dev);
+ - increment the device's usage counter, run pm_request_resume(dev) and
+ return its result
+
+ int pm_runtime_get_sync(struct device *dev);
+ - increment the device's usage counter, run pm_runtime_resume(dev) and
+ return its result
+
+ void pm_runtime_put_noidle(struct device *dev);
+ - decrement the device's usage counter
+
+ int pm_runtime_put(struct device *dev);
+ - decrement the device's usage counter, run pm_request_idle(dev) and return
+ its result
+
+ int pm_runtime_put_sync(struct device *dev);
+ - decrement the device's usage counter, run pm_runtime_idle(dev) and return
+ its result
+
+ void pm_runtime_enable(struct device *dev);
+ - enable the run-time PM helper functions to run the device bus type's
+ run-time PM callbacks described in Section 2
+
+ int pm_runtime_disable(struct device *dev);
+ - prevent the run-time PM helper functions from running the device bus
+ type's run-time PM callbacks, make sure that all of the pending run-time
+ PM operations on the device are either completed or canceled; returns
+ 1 if there was a resume request pending and it was necessary to execute
+ ->runtime_resume() for the device's bus type to satisfy that request,
+ otherwise 0 is returned
+
+ void pm_suspend_ignore_children(struct device *dev, bool enable);
+ - set/unset the power.ignore_children flag of the device
+
+ int pm_runtime_set_active(struct device *dev);
+ - clear the device's 'power.runtime_error' flag, set the device's run-time
+ PM status to 'active' and update its parent's counter of 'active'
+ children as appropriate (it is only valid to use this function if
+ 'power.runtime_error' is set or 'power.disable_depth' is greater than
+ zero); it will fail and return error code if the device has a parent
+ which is not active and the 'power.ignore_children' flag of which is unset
+
+ void pm_runtime_set_suspended(struct device *dev);
+ - clear the device's 'power.runtime_error' flag, set the device's run-time
+ PM status to 'suspended' and update its parent's counter of 'active'
+ children as appropriate (it is only valid to use this function if
+ 'power.runtime_error' is set or 'power.disable_depth' is greater than
+ zero)
+
+It is safe to execute the following helper functions from interrupt context:
+
+pm_request_idle()
+pm_schedule_suspend()
+pm_request_resume()
+pm_runtime_get_noresume()
+pm_runtime_get()
+pm_runtime_put_noidle()
+pm_runtime_put()
+pm_suspend_ignore_children()
+pm_runtime_set_active()
+pm_runtime_set_suspended()
+pm_runtime_enable()
+
+5. Run-time PM Initialization, Device Probing and Removal
+
+Initially, the run-time PM is disabled for all devices, which means that the
+majority of the run-time PM helper funtions described in Section 4 will return
+-EAGAIN until pm_runtime_enable() is called for the device.
+
+In addition to that, the initial run-time PM status of all devices is
+'suspended', but it need not reflect the actual physical state of the device.
+Thus, if the device is initially active (i.e. it is able to process I/O), its
+run-time PM status must be changed to 'active', with the help of
+pm_runtime_set_active(), before pm_runtime_enable() is called for the device.
+
+However, if the device has a parent and the parent's run-time PM is enabled,
+calling pm_runtime_set_active() for the device will affect the parent, unless
+the parent's 'power.ignore_children' flag is set. Namely, in that case the
+parent won't be able to suspend at run time, using the PM core's helper
+functions, as long as the child's status is 'active', even if the child's
+run-time PM is still disabled (i.e. pm_runtime_enable() hasn't been called for
+the child yet or pm_runtime_disable() has been called for it). For this reason,
+once pm_runtime_set_active() has been called for the device, pm_runtime_enable()
+should be called for it too as soon as reasonably possible or its run-time PM
+status should be changed back to 'suspended' with the help of
+pm_runtime_set_suspended().
+
+If the default initial run-time PM status of the device (i.e. 'suspended')
+reflects the actual state of the device, its bus type's or its driver's
+->probe() callback will likely need to wake it up using one of the PM core's
+helper functions described in Section 4. In that case, pm_runtime_resume()
+should be used. Of course, for this purpose the device's run-time PM has to be
+enabled earlier by calling pm_runtime_enable().
+
+If the device bus type's or driver's ->probe() or ->remove() callback runs
+pm_runtime_suspend() or pm_runtime_idle() or their asynchronous counterparts,
+they will fail returning -EAGAIN, because the device's usage counter is
+incremented by the core before executing ->probe() and ->remove(). Still, it
+may be desirable to suspend the device as soon as ->probe() or ->remove() has
+finished, so the PM core uses pm_runtime_idle_sync() to invoke the device bus
+type's ->runtime_idle() callback at that time.
#endif
};
+struct pdev_archdata {
+};
+
#endif
return 0;
}
-static int fpga_suspend_late(struct platform_device *pdev, pm_message_t mesg)
+static int fpga_suspend_noirq(struct device *dev)
{
__raw_writew(~0, &fpga->leds);
return 0;
}
-static int fpga_resume_early(struct platform_device *pdev)
+static int fpga_resume_noirq(struct device *dev)
{
__raw_writew(~hw_led_state, &fpga->leds);
return 0;
}
+static struct dev_pm_ops fpga_dev_pm_ops = {
+ .suspend_noirq = fpga_suspend_noirq,
+ .resume_noirq = fpga_resume_noirq,
+};
static struct platform_driver led_driver = {
.driver.name = "omap_dbg_led",
+ .driver.pm = &fpga_dev_pm_ops,
.probe = fpga_probe,
- .suspend_late = fpga_suspend_late,
- .resume_early = fpga_resume_early,
};
static int __init fpga_init(void)
#include <linux/platform_device.h>
-static int omap_mpuio_suspend_late(struct platform_device *pdev, pm_message_t mesg)
+static int omap_mpuio_suspend_noirq(struct device *dev)
{
+ struct platform_device *pdev = to_platform_device(dev);
struct gpio_bank *bank = platform_get_drvdata(pdev);
void __iomem *mask_reg = bank->base + OMAP_MPUIO_GPIO_MASKIT;
unsigned long flags;
return 0;
}
-static int omap_mpuio_resume_early(struct platform_device *pdev)
+static int omap_mpuio_resume_noirq(struct device *dev)
{
+ struct platform_device *pdev = to_platform_device(dev);
struct gpio_bank *bank = platform_get_drvdata(pdev);
void __iomem *mask_reg = bank->base + OMAP_MPUIO_GPIO_MASKIT;
unsigned long flags;
return 0;
}
+static struct dev_pm_ops omap_mpuio_dev_pm_ops = {
+ .suspend_noirq = omap_mpuio_suspend_noirq,
+ .resume_noirq = omap_mpuio_resume_noirq,
+};
+
/* use platform_driver for this, now that there's no longer any
* point to sys_device (other than not disturbing old code).
*/
static struct platform_driver omap_mpuio_driver = {
- .suspend_late = omap_mpuio_suspend_late,
- .resume_early = omap_mpuio_resume_early,
.driver = {
.name = "mpuio",
+ .pm = &omap_mpuio_dev_pm_ops,
},
};
#endif
};
+struct pdev_archdata {
+};
+
#endif /* _ASM_IA64_DEVICE_H */
struct device_node *of_node;
};
+struct pdev_archdata {
+};
+
#endif /* _ASM_MICROBLAZE_DEVICE_H */
return ad->of_node;
}
+struct pdev_archdata {
+};
+
#endif /* _ASM_POWERPC_DEVICE_H */
return ad->prom_node;
}
+struct pdev_archdata {
+};
+
#endif /* _ASM_SPARC_DEVICE_H */
#endif
};
+struct pdev_archdata {
+};
+
#endif /* _ASM_X86_DEVICE_H */
#include <linux/kthread.h>
#include <linux/wait.h>
#include <linux/async.h>
+#include <linux/pm_runtime.h>
#include "base.h"
#include "power/power.h"
pr_debug("bus: '%s': %s: matched device %s with driver %s\n",
drv->bus->name, __func__, dev_name(dev), drv->name);
+ pm_runtime_get_noresume(dev);
+ pm_runtime_barrier(dev);
ret = really_probe(dev, drv);
+ pm_runtime_put_sync(dev);
return ret;
}
ret = 0;
}
} else {
+ pm_runtime_get_noresume(dev);
ret = bus_for_each_drv(dev->bus, NULL, dev, __device_attach);
+ pm_runtime_put_sync(dev);
}
up(&dev->sem);
return ret;
drv = dev->driver;
if (drv) {
+ pm_runtime_get_noresume(dev);
+ pm_runtime_barrier(dev);
+
driver_sysfs_remove(dev);
if (dev->bus)
blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
BUS_NOTIFY_UNBOUND_DRIVER,
dev);
+
+ pm_runtime_put_sync(dev);
}
}
#include <linux/bootmem.h>
#include <linux/err.h>
#include <linux/slab.h>
+#include <linux/pm_runtime.h>
#include "base.h"
return ret;
}
-static int platform_legacy_suspend_late(struct device *dev, pm_message_t mesg)
-{
- struct platform_driver *pdrv = to_platform_driver(dev->driver);
- struct platform_device *pdev = to_platform_device(dev);
- int ret = 0;
-
- if (dev->driver && pdrv->suspend_late)
- ret = pdrv->suspend_late(pdev, mesg);
-
- return ret;
-}
-
-static int platform_legacy_resume_early(struct device *dev)
-{
- struct platform_driver *pdrv = to_platform_driver(dev->driver);
- struct platform_device *pdev = to_platform_device(dev);
- int ret = 0;
-
- if (dev->driver && pdrv->resume_early)
- ret = pdrv->resume_early(pdev);
-
- return ret;
-}
-
static int platform_legacy_resume(struct device *dev)
{
struct platform_driver *pdrv = to_platform_driver(dev->driver);
drv->pm->complete(dev);
}
+#else /* !CONFIG_PM_SLEEP */
+
+#define platform_pm_prepare NULL
+#define platform_pm_complete NULL
+
+#endif /* !CONFIG_PM_SLEEP */
+
#ifdef CONFIG_SUSPEND
static int platform_pm_suspend(struct device *dev)
if (drv->pm) {
if (drv->pm->suspend_noirq)
ret = drv->pm->suspend_noirq(dev);
- } else {
- ret = platform_legacy_suspend_late(dev, PMSG_SUSPEND);
}
return ret;
if (drv->pm) {
if (drv->pm->resume_noirq)
ret = drv->pm->resume_noirq(dev);
- } else {
- ret = platform_legacy_resume_early(dev);
}
return ret;
if (drv->pm) {
if (drv->pm->freeze_noirq)
ret = drv->pm->freeze_noirq(dev);
- } else {
- ret = platform_legacy_suspend_late(dev, PMSG_FREEZE);
}
return ret;
if (drv->pm) {
if (drv->pm->thaw_noirq)
ret = drv->pm->thaw_noirq(dev);
- } else {
- ret = platform_legacy_resume_early(dev);
}
return ret;
if (drv->pm) {
if (drv->pm->poweroff_noirq)
ret = drv->pm->poweroff_noirq(dev);
- } else {
- ret = platform_legacy_suspend_late(dev, PMSG_HIBERNATE);
}
return ret;
if (drv->pm) {
if (drv->pm->restore_noirq)
ret = drv->pm->restore_noirq(dev);
- } else {
- ret = platform_legacy_resume_early(dev);
}
return ret;
#endif /* !CONFIG_HIBERNATION */
+#ifdef CONFIG_PM_RUNTIME
+
+int __weak platform_pm_runtime_suspend(struct device *dev)
+{
+ return -ENOSYS;
+};
+
+int __weak platform_pm_runtime_resume(struct device *dev)
+{
+ return -ENOSYS;
+};
+
+int __weak platform_pm_runtime_idle(struct device *dev)
+{
+ return -ENOSYS;
+};
+
+#else /* !CONFIG_PM_RUNTIME */
+
+#define platform_pm_runtime_suspend NULL
+#define platform_pm_runtime_resume NULL
+#define platform_pm_runtime_idle NULL
+
+#endif /* !CONFIG_PM_RUNTIME */
+
static const struct dev_pm_ops platform_dev_pm_ops = {
.prepare = platform_pm_prepare,
.complete = platform_pm_complete,
.thaw_noirq = platform_pm_thaw_noirq,
.poweroff_noirq = platform_pm_poweroff_noirq,
.restore_noirq = platform_pm_restore_noirq,
+ .runtime_suspend = platform_pm_runtime_suspend,
+ .runtime_resume = platform_pm_runtime_resume,
+ .runtime_idle = platform_pm_runtime_idle,
};
-#define PLATFORM_PM_OPS_PTR (&platform_dev_pm_ops)
-
-#else /* !CONFIG_PM_SLEEP */
-
-#define PLATFORM_PM_OPS_PTR NULL
-
-#endif /* !CONFIG_PM_SLEEP */
-
struct bus_type platform_bus_type = {
.name = "platform",
.dev_attrs = platform_dev_attrs,
.match = platform_match,
.uevent = platform_uevent,
- .pm = PLATFORM_PM_OPS_PTR,
+ .pm = &platform_dev_pm_ops,
};
EXPORT_SYMBOL_GPL(platform_bus_type);
obj-$(CONFIG_PM) += sysfs.o
obj-$(CONFIG_PM_SLEEP) += main.o
+obj-$(CONFIG_PM_RUNTIME) += runtime.o
obj-$(CONFIG_PM_TRACE_RTC) += trace.o
ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG
#include <linux/kallsyms.h>
#include <linux/mutex.h>
#include <linux/pm.h>
+#include <linux/pm_runtime.h>
#include <linux/resume-trace.h>
#include <linux/rwsem.h>
#include <linux/interrupt.h>
static bool transition_started;
/**
- * device_pm_lock - lock the list of active devices used by the PM core
+ * device_pm_init - Initialize the PM-related part of a device object.
+ * @dev: Device object being initialized.
+ */
+void device_pm_init(struct device *dev)
+{
+ dev->power.status = DPM_ON;
+ pm_runtime_init(dev);
+}
+
+/**
+ * device_pm_lock - Lock the list of active devices used by the PM core.
*/
void device_pm_lock(void)
{
}
/**
- * device_pm_unlock - unlock the list of active devices used by the PM core
+ * device_pm_unlock - Unlock the list of active devices used by the PM core.
*/
void device_pm_unlock(void)
{
}
/**
- * device_pm_add - add a device to the list of active devices
- * @dev: Device to be added to the list
+ * device_pm_add - Add a device to the PM core's list of active devices.
+ * @dev: Device to add to the list.
*/
void device_pm_add(struct device *dev)
{
}
/**
- * device_pm_remove - remove a device from the list of active devices
- * @dev: Device to be removed from the list
- *
- * This function also removes the device's PM-related sysfs attributes.
+ * device_pm_remove - Remove a device from the PM core's list of active devices.
+ * @dev: Device to be removed from the list.
*/
void device_pm_remove(struct device *dev)
{
mutex_lock(&dpm_list_mtx);
list_del_init(&dev->power.entry);
mutex_unlock(&dpm_list_mtx);
+ pm_runtime_remove(dev);
}
/**
- * device_pm_move_before - move device in dpm_list
- * @deva: Device to move in dpm_list
- * @devb: Device @deva should come before
+ * device_pm_move_before - Move device in the PM core's list of active devices.
+ * @deva: Device to move in dpm_list.
+ * @devb: Device @deva should come before.
*/
void device_pm_move_before(struct device *deva, struct device *devb)
{
}
/**
- * device_pm_move_after - move device in dpm_list
- * @deva: Device to move in dpm_list
- * @devb: Device @deva should come after
+ * device_pm_move_after - Move device in the PM core's list of active devices.
+ * @deva: Device to move in dpm_list.
+ * @devb: Device @deva should come after.
*/
void device_pm_move_after(struct device *deva, struct device *devb)
{
}
/**
- * device_pm_move_last - move device to end of dpm_list
- * @dev: Device to move in dpm_list
+ * device_pm_move_last - Move device to end of the PM core's list of devices.
+ * @dev: Device to move in dpm_list.
*/
void device_pm_move_last(struct device *dev)
{
}
/**
- * pm_op - execute the PM operation appropiate for given PM event
- * @dev: Device.
- * @ops: PM operations to choose from.
- * @state: PM transition of the system being carried out.
+ * pm_op - Execute the PM operation appropriate for given PM event.
+ * @dev: Device to handle.
+ * @ops: PM operations to choose from.
+ * @state: PM transition of the system being carried out.
*/
static int pm_op(struct device *dev,
const struct dev_pm_ops *ops,
}
/**
- * pm_noirq_op - execute the PM operation appropiate for given PM event
- * @dev: Device.
- * @ops: PM operations to choose from.
- * @state: PM transition of the system being carried out.
+ * pm_noirq_op - Execute the PM operation appropriate for given PM event.
+ * @dev: Device to handle.
+ * @ops: PM operations to choose from.
+ * @state: PM transition of the system being carried out.
*
- * The operation is executed with interrupts disabled by the only remaining
- * functional CPU in the system.
+ * The driver of @dev will not receive interrupts while this function is being
+ * executed.
*/
static int pm_noirq_op(struct device *dev,
const struct dev_pm_ops *ops,
/*------------------------- Resume routines -------------------------*/
/**
- * device_resume_noirq - Power on one device (early resume).
- * @dev: Device.
- * @state: PM transition of the system being carried out.
+ * device_resume_noirq - Execute an "early resume" callback for given device.
+ * @dev: Device to handle.
+ * @state: PM transition of the system being carried out.
*
- * Must be called with interrupts disabled.
+ * The driver of @dev will not receive interrupts while this function is being
+ * executed.
*/
static int device_resume_noirq(struct device *dev, pm_message_t state)
{
}
/**
- * dpm_resume_noirq - Power on all regular (non-sysdev) devices.
- * @state: PM transition of the system being carried out.
- *
- * Call the "noirq" resume handlers for all devices marked as
- * DPM_OFF_IRQ and enable device drivers to receive interrupts.
+ * dpm_resume_noirq - Execute "early resume" callbacks for non-sysdev devices.
+ * @state: PM transition of the system being carried out.
*
- * Must be called under dpm_list_mtx. Device drivers should not receive
- * interrupts while it's being executed.
+ * Call the "noirq" resume handlers for all devices marked as DPM_OFF_IRQ and
+ * enable device drivers to receive interrupts.
*/
void dpm_resume_noirq(pm_message_t state)
{
struct device *dev;
mutex_lock(&dpm_list_mtx);
+ transition_started = false;
list_for_each_entry(dev, &dpm_list, power.entry)
if (dev->power.status > DPM_OFF) {
int error;
EXPORT_SYMBOL_GPL(dpm_resume_noirq);
/**
- * device_resume - Restore state for one device.
- * @dev: Device.
- * @state: PM transition of the system being carried out.
+ * device_resume - Execute "resume" callbacks for given device.
+ * @dev: Device to handle.
+ * @state: PM transition of the system being carried out.
*/
static int device_resume(struct device *dev, pm_message_t state)
{
}
/**
- * dpm_resume - Resume every device.
- * @state: PM transition of the system being carried out.
+ * dpm_resume - Execute "resume" callbacks for non-sysdev devices.
+ * @state: PM transition of the system being carried out.
*
- * Execute the appropriate "resume" callback for all devices the status of
- * which indicates that they are inactive.
+ * Execute the appropriate "resume" callback for all devices whose status
+ * indicates that they are suspended.
*/
static void dpm_resume(pm_message_t state)
{
INIT_LIST_HEAD(&list);
mutex_lock(&dpm_list_mtx);
- transition_started = false;
while (!list_empty(&dpm_list)) {
struct device *dev = to_device(dpm_list.next);
}
/**
- * device_complete - Complete a PM transition for given device
- * @dev: Device.
- * @state: PM transition of the system being carried out.
+ * device_complete - Complete a PM transition for given device.
+ * @dev: Device to handle.
+ * @state: PM transition of the system being carried out.
*/
static void device_complete(struct device *dev, pm_message_t state)
{
}
/**
- * dpm_complete - Complete a PM transition for all devices.
- * @state: PM transition of the system being carried out.
+ * dpm_complete - Complete a PM transition for all non-sysdev devices.
+ * @state: PM transition of the system being carried out.
*
- * Execute the ->complete() callbacks for all devices that are not marked
- * as DPM_ON.
+ * Execute the ->complete() callbacks for all devices whose PM status is not
+ * DPM_ON (this allows new devices to be registered).
*/
static void dpm_complete(pm_message_t state)
{
mutex_unlock(&dpm_list_mtx);
device_complete(dev, state);
+ pm_runtime_put_noidle(dev);
mutex_lock(&dpm_list_mtx);
}
}
/**
- * dpm_resume_end - Restore state of each device in system.
- * @state: PM transition of the system being carried out.
+ * dpm_resume_end - Execute "resume" callbacks and complete system transition.
+ * @state: PM transition of the system being carried out.
*
- * Resume all the devices, unlock them all, and allow new
- * devices to be registered once again.
+ * Execute "resume" callbacks for all devices and complete the PM transition of
+ * the system.
*/
void dpm_resume_end(pm_message_t state)
{
/*------------------------- Suspend routines -------------------------*/
/**
- * resume_event - return a PM message representing the resume event
- * corresponding to given sleep state.
- * @sleep_state: PM message representing a sleep state.
+ * resume_event - Return a "resume" message for given "suspend" sleep state.
+ * @sleep_state: PM message representing a sleep state.
+ *
+ * Return a PM message representing the resume event corresponding to given
+ * sleep state.
*/
static pm_message_t resume_event(pm_message_t sleep_state)
{
}
/**
- * device_suspend_noirq - Shut down one device (late suspend).
- * @dev: Device.
- * @state: PM transition of the system being carried out.
+ * device_suspend_noirq - Execute a "late suspend" callback for given device.
+ * @dev: Device to handle.
+ * @state: PM transition of the system being carried out.
*
- * This is called with interrupts off and only a single CPU running.
+ * The driver of @dev will not receive interrupts while this function is being
+ * executed.
*/
static int device_suspend_noirq(struct device *dev, pm_message_t state)
{
}
/**
- * dpm_suspend_noirq - Power down all regular (non-sysdev) devices.
- * @state: PM transition of the system being carried out.
- *
- * Prevent device drivers from receiving interrupts and call the "noirq"
- * suspend handlers.
+ * dpm_suspend_noirq - Execute "late suspend" callbacks for non-sysdev devices.
+ * @state: PM transition of the system being carried out.
*
- * Must be called under dpm_list_mtx.
+ * Prevent device drivers from receiving interrupts and call the "noirq" suspend
+ * handlers for all non-sysdev devices.
*/
int dpm_suspend_noirq(pm_message_t state)
{
EXPORT_SYMBOL_GPL(dpm_suspend_noirq);
/**
- * device_suspend - Save state of one device.
- * @dev: Device.
- * @state: PM transition of the system being carried out.
+ * device_suspend - Execute "suspend" callbacks for given device.
+ * @dev: Device to handle.
+ * @state: PM transition of the system being carried out.
*/
static int device_suspend(struct device *dev, pm_message_t state)
{
}
/**
- * dpm_suspend - Suspend every device.
- * @state: PM transition of the system being carried out.
- *
- * Execute the appropriate "suspend" callbacks for all devices.
+ * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices.
+ * @state: PM transition of the system being carried out.
*/
static int dpm_suspend(pm_message_t state)
{
}
/**
- * device_prepare - Execute the ->prepare() callback(s) for given device.
- * @dev: Device.
- * @state: PM transition of the system being carried out.
+ * device_prepare - Prepare a device for system power transition.
+ * @dev: Device to handle.
+ * @state: PM transition of the system being carried out.
+ *
+ * Execute the ->prepare() callback(s) for given device. No new children of the
+ * device may be registered after this function has returned.
*/
static int device_prepare(struct device *dev, pm_message_t state)
{
}
/**
- * dpm_prepare - Prepare all devices for a PM transition.
- * @state: PM transition of the system being carried out.
+ * dpm_prepare - Prepare all non-sysdev devices for a system PM transition.
+ * @state: PM transition of the system being carried out.
*
- * Execute the ->prepare() callback for all devices.
+ * Execute the ->prepare() callback(s) for all devices.
*/
static int dpm_prepare(pm_message_t state)
{
dev->power.status = DPM_PREPARING;
mutex_unlock(&dpm_list_mtx);
- error = device_prepare(dev, state);
+ pm_runtime_get_noresume(dev);
+ if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) {
+ /* Wake-up requested during system sleep transition. */
+ pm_runtime_put_noidle(dev);
+ error = -EBUSY;
+ } else {
+ error = device_prepare(dev, state);
+ }
mutex_lock(&dpm_list_mtx);
if (error) {
}
/**
- * dpm_suspend_start - Save state and stop all devices in system.
- * @state: PM transition of the system being carried out.
+ * dpm_suspend_start - Prepare devices for PM transition and suspend them.
+ * @state: PM transition of the system being carried out.
*
- * Prepare and suspend all devices.
+ * Prepare all non-sysdev devices for system PM transition and execute "suspend"
+ * callbacks for them.
*/
int dpm_suspend_start(pm_message_t state)
{
-static inline void device_pm_init(struct device *dev)
-{
- dev->power.status = DPM_ON;
-}
+#ifdef CONFIG_PM_RUNTIME
+
+extern void pm_runtime_init(struct device *dev);
+extern void pm_runtime_remove(struct device *dev);
+
+#else /* !CONFIG_PM_RUNTIME */
+
+static inline void pm_runtime_init(struct device *dev) {}
+static inline void pm_runtime_remove(struct device *dev) {}
+
+#endif /* !CONFIG_PM_RUNTIME */
#ifdef CONFIG_PM_SLEEP
return container_of(entry, struct device, power.entry);
}
+extern void device_pm_init(struct device *dev);
extern void device_pm_add(struct device *);
extern void device_pm_remove(struct device *);
extern void device_pm_move_before(struct device *, struct device *);
extern void device_pm_move_after(struct device *, struct device *);
extern void device_pm_move_last(struct device *);
-#else /* CONFIG_PM_SLEEP */
+#else /* !CONFIG_PM_SLEEP */
+
+static inline void device_pm_init(struct device *dev)
+{
+ pm_runtime_init(dev);
+}
+
+static inline void device_pm_remove(struct device *dev)
+{
+ pm_runtime_remove(dev);
+}
static inline void device_pm_add(struct device *dev) {}
-static inline void device_pm_remove(struct device *dev) {}
static inline void device_pm_move_before(struct device *deva,
struct device *devb) {}
static inline void device_pm_move_after(struct device *deva,
struct device *devb) {}
static inline void device_pm_move_last(struct device *dev) {}
-#endif
+#endif /* !CONFIG_PM_SLEEP */
#ifdef CONFIG_PM
--- /dev/null
+/*
+ * drivers/base/power/runtime.c - Helper functions for device run-time PM
+ *
+ * Copyright (c) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
+ *
+ * This file is released under the GPLv2.
+ */
+
+#include <linux/sched.h>
+#include <linux/pm_runtime.h>
+#include <linux/jiffies.h>
+
+static int __pm_runtime_resume(struct device *dev, bool from_wq);
+static int __pm_request_idle(struct device *dev);
+static int __pm_request_resume(struct device *dev);
+
+/**
+ * pm_runtime_deactivate_timer - Deactivate given device's suspend timer.
+ * @dev: Device to handle.
+ */
+static void pm_runtime_deactivate_timer(struct device *dev)
+{
+ if (dev->power.timer_expires > 0) {
+ del_timer(&dev->power.suspend_timer);
+ dev->power.timer_expires = 0;
+ }
+}
+
+/**
+ * pm_runtime_cancel_pending - Deactivate suspend timer and cancel requests.
+ * @dev: Device to handle.
+ */
+static void pm_runtime_cancel_pending(struct device *dev)
+{
+ pm_runtime_deactivate_timer(dev);
+ /*
+ * In case there's a request pending, make sure its work function will
+ * return without doing anything.
+ */
+ dev->power.request = RPM_REQ_NONE;
+}
+
+/**
+ * __pm_runtime_idle - Notify device bus type if the device can be suspended.
+ * @dev: Device to notify the bus type about.
+ *
+ * This function must be called under dev->power.lock with interrupts disabled.
+ */
+static int __pm_runtime_idle(struct device *dev)
+ __releases(&dev->power.lock) __acquires(&dev->power.lock)
+{
+ int retval = 0;
+
+ dev_dbg(dev, "__pm_runtime_idle()!\n");
+
+ if (dev->power.runtime_error)
+ retval = -EINVAL;
+ else if (dev->power.idle_notification)
+ retval = -EINPROGRESS;
+ else if (atomic_read(&dev->power.usage_count) > 0
+ || dev->power.disable_depth > 0
+ || dev->power.runtime_status != RPM_ACTIVE)
+ retval = -EAGAIN;
+ else if (!pm_children_suspended(dev))
+ retval = -EBUSY;
+ if (retval)
+ goto out;
+
+ if (dev->power.request_pending) {
+ /*
+ * If an idle notification request is pending, cancel it. Any
+ * other pending request takes precedence over us.
+ */
+ if (dev->power.request == RPM_REQ_IDLE) {
+ dev->power.request = RPM_REQ_NONE;
+ } else if (dev->power.request != RPM_REQ_NONE) {
+ retval = -EAGAIN;
+ goto out;
+ }
+ }
+
+ dev->power.idle_notification = true;
+
+ if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_idle) {
+ spin_unlock_irq(&dev->power.lock);
+
+ dev->bus->pm->runtime_idle(dev);
+
+ spin_lock_irq(&dev->power.lock);
+ }
+
+ dev->power.idle_notification = false;
+ wake_up_all(&dev->power.wait_queue);
+
+ out:
+ dev_dbg(dev, "__pm_runtime_idle() returns %d!\n", retval);
+
+ return retval;
+}
+
+/**
+ * pm_runtime_idle - Notify device bus type if the device can be suspended.
+ * @dev: Device to notify the bus type about.
+ */
+int pm_runtime_idle(struct device *dev)
+{
+ int retval;
+
+ spin_lock_irq(&dev->power.lock);
+ retval = __pm_runtime_idle(dev);
+ spin_unlock_irq(&dev->power.lock);
+
+ return retval;
+}
+EXPORT_SYMBOL_GPL(pm_runtime_idle);
+
+/**
+ * __pm_runtime_suspend - Carry out run-time suspend of given device.
+ * @dev: Device to suspend.
+ * @from_wq: If set, the function has been called via pm_wq.
+ *
+ * Check if the device can be suspended and run the ->runtime_suspend() callback
+ * provided by its bus type. If another suspend has been started earlier, wait
+ * for it to finish. If an idle notification or suspend request is pending or
+ * scheduled, cancel it.
+ *
+ * This function must be called under dev->power.lock with interrupts disabled.
+ */
+int __pm_runtime_suspend(struct device *dev, bool from_wq)
+ __releases(&dev->power.lock) __acquires(&dev->power.lock)
+{
+ struct device *parent = NULL;
+ bool notify = false;
+ int retval = 0;
+
+ dev_dbg(dev, "__pm_runtime_suspend()%s!\n",
+ from_wq ? " from workqueue" : "");
+
+ repeat:
+ if (dev->power.runtime_error) {
+ retval = -EINVAL;
+ goto out;
+ }
+
+ /* Pending resume requests take precedence over us. */
+ if (dev->power.request_pending
+ && dev->power.request == RPM_REQ_RESUME) {
+ retval = -EAGAIN;
+ goto out;
+ }
+
+ /* Other scheduled or pending requests need to be canceled. */
+ pm_runtime_cancel_pending(dev);
+
+ if (dev->power.runtime_status == RPM_SUSPENDED)
+ retval = 1;
+ else if (dev->power.runtime_status == RPM_RESUMING
+ || dev->power.disable_depth > 0
+ || atomic_read(&dev->power.usage_count) > 0)
+ retval = -EAGAIN;
+ else if (!pm_children_suspended(dev))
+ retval = -EBUSY;
+ if (retval)
+ goto out;
+
+ if (dev->power.runtime_status == RPM_SUSPENDING) {
+ DEFINE_WAIT(wait);
+
+ if (from_wq) {
+ retval = -EINPROGRESS;
+ goto out;
+ }
+
+ /* Wait for the other suspend running in parallel with us. */
+ for (;;) {
+ prepare_to_wait(&dev->power.wait_queue, &wait,
+ TASK_UNINTERRUPTIBLE);
+ if (dev->power.runtime_status != RPM_SUSPENDING)
+ break;
+
+ spin_unlock_irq(&dev->power.lock);
+
+ schedule();
+
+ spin_lock_irq(&dev->power.lock);
+ }
+ finish_wait(&dev->power.wait_queue, &wait);
+ goto repeat;
+ }
+
+ dev->power.runtime_status = RPM_SUSPENDING;
+
+ if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_suspend) {
+ spin_unlock_irq(&dev->power.lock);
+
+ retval = dev->bus->pm->runtime_suspend(dev);
+
+ spin_lock_irq(&dev->power.lock);
+ dev->power.runtime_error = retval;
+ } else {
+ retval = -ENOSYS;
+ }
+
+ if (retval) {
+ dev->power.runtime_status = RPM_ACTIVE;
+ pm_runtime_cancel_pending(dev);
+ dev->power.deferred_resume = false;
+
+ if (retval == -EAGAIN || retval == -EBUSY) {
+ notify = true;
+ dev->power.runtime_error = 0;
+ }
+ } else {
+ dev->power.runtime_status = RPM_SUSPENDED;
+
+ if (dev->parent) {
+ parent = dev->parent;
+ atomic_add_unless(&parent->power.child_count, -1, 0);
+ }
+ }
+ wake_up_all(&dev->power.wait_queue);
+
+ if (dev->power.deferred_resume) {
+ dev->power.deferred_resume = false;
+ __pm_runtime_resume(dev, false);
+ retval = -EAGAIN;
+ goto out;
+ }
+
+ if (notify)
+ __pm_runtime_idle(dev);
+
+ if (parent && !parent->power.ignore_children) {
+ spin_unlock_irq(&dev->power.lock);
+
+ pm_request_idle(parent);
+
+ spin_lock_irq(&dev->power.lock);
+ }
+
+ out:
+ dev_dbg(dev, "__pm_runtime_suspend() returns %d!\n", retval);
+
+ return retval;
+}
+
+/**
+ * pm_runtime_suspend - Carry out run-time suspend of given device.
+ * @dev: Device to suspend.
+ */
+int pm_runtime_suspend(struct device *dev)
+{
+ int retval;
+
+ spin_lock_irq(&dev->power.lock);
+ retval = __pm_runtime_suspend(dev, false);
+ spin_unlock_irq(&dev->power.lock);
+
+ return retval;
+}
+EXPORT_SYMBOL_GPL(pm_runtime_suspend);
+
+/**
+ * __pm_runtime_resume - Carry out run-time resume of given device.
+ * @dev: Device to resume.
+ * @from_wq: If set, the function has been called via pm_wq.
+ *
+ * Check if the device can be woken up and run the ->runtime_resume() callback
+ * provided by its bus type. If another resume has been started earlier, wait
+ * for it to finish. If there's a suspend running in parallel with this
+ * function, wait for it to finish and resume the device. Cancel any scheduled
+ * or pending requests.
+ *
+ * This function must be called under dev->power.lock with interrupts disabled.
+ */
+int __pm_runtime_resume(struct device *dev, bool from_wq)
+ __releases(&dev->power.lock) __acquires(&dev->power.lock)
+{
+ struct device *parent = NULL;
+ int retval = 0;
+
+ dev_dbg(dev, "__pm_runtime_resume()%s!\n",
+ from_wq ? " from workqueue" : "");
+
+ repeat:
+ if (dev->power.runtime_error) {
+ retval = -EINVAL;
+ goto out;
+ }
+
+ pm_runtime_cancel_pending(dev);
+
+ if (dev->power.runtime_status == RPM_ACTIVE)
+ retval = 1;
+ else if (dev->power.disable_depth > 0)
+ retval = -EAGAIN;
+ if (retval)
+ goto out;
+
+ if (dev->power.runtime_status == RPM_RESUMING
+ || dev->power.runtime_status == RPM_SUSPENDING) {
+ DEFINE_WAIT(wait);
+
+ if (from_wq) {
+ if (dev->power.runtime_status == RPM_SUSPENDING)
+ dev->power.deferred_resume = true;
+ retval = -EINPROGRESS;
+ goto out;
+ }
+
+ /* Wait for the operation carried out in parallel with us. */
+ for (;;) {
+ prepare_to_wait(&dev->power.wait_queue, &wait,
+ TASK_UNINTERRUPTIBLE);
+ if (dev->power.runtime_status != RPM_RESUMING
+ && dev->power.runtime_status != RPM_SUSPENDING)
+ break;
+
+ spin_unlock_irq(&dev->power.lock);
+
+ schedule();
+
+ spin_lock_irq(&dev->power.lock);
+ }
+ finish_wait(&dev->power.wait_queue, &wait);
+ goto repeat;
+ }
+
+ if (!parent && dev->parent) {
+ /*
+ * Increment the parent's resume counter and resume it if
+ * necessary.
+ */
+ parent = dev->parent;
+ spin_unlock_irq(&dev->power.lock);
+
+ pm_runtime_get_noresume(parent);
+
+ spin_lock_irq(&parent->power.lock);
+ /*
+ * We can resume if the parent's run-time PM is disabled or it
+ * is set to ignore children.
+ */
+ if (!parent->power.disable_depth
+ && !parent->power.ignore_children) {
+ __pm_runtime_resume(parent, false);
+ if (parent->power.runtime_status != RPM_ACTIVE)
+ retval = -EBUSY;
+ }
+ spin_unlock_irq(&parent->power.lock);
+
+ spin_lock_irq(&dev->power.lock);
+ if (retval)
+ goto out;
+ goto repeat;
+ }
+
+ dev->power.runtime_status = RPM_RESUMING;
+
+ if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_resume) {
+ spin_unlock_irq(&dev->power.lock);
+
+ retval = dev->bus->pm->runtime_resume(dev);
+
+ spin_lock_irq(&dev->power.lock);
+ dev->power.runtime_error = retval;
+ } else {
+ retval = -ENOSYS;
+ }
+
+ if (retval) {
+ dev->power.runtime_status = RPM_SUSPENDED;
+ pm_runtime_cancel_pending(dev);
+ } else {
+ dev->power.runtime_status = RPM_ACTIVE;
+ if (parent)
+ atomic_inc(&parent->power.child_count);
+ }
+ wake_up_all(&dev->power.wait_queue);
+
+ if (!retval)
+ __pm_request_idle(dev);
+
+ out:
+ if (parent) {
+ spin_unlock_irq(&dev->power.lock);
+
+ pm_runtime_put(parent);
+
+ spin_lock_irq(&dev->power.lock);
+ }
+
+ dev_dbg(dev, "__pm_runtime_resume() returns %d!\n", retval);
+
+ return retval;
+}
+
+/**
+ * pm_runtime_resume - Carry out run-time resume of given device.
+ * @dev: Device to suspend.
+ */
+int pm_runtime_resume(struct device *dev)
+{
+ int retval;
+
+ spin_lock_irq(&dev->power.lock);
+ retval = __pm_runtime_resume(dev, false);
+ spin_unlock_irq(&dev->power.lock);
+
+ return retval;
+}
+EXPORT_SYMBOL_GPL(pm_runtime_resume);
+
+/**
+ * pm_runtime_work - Universal run-time PM work function.
+ * @work: Work structure used for scheduling the execution of this function.
+ *
+ * Use @work to get the device object the work is to be done for, determine what
+ * is to be done and execute the appropriate run-time PM function.
+ */
+static void pm_runtime_work(struct work_struct *work)
+{
+ struct device *dev = container_of(work, struct device, power.work);
+ enum rpm_request req;
+
+ spin_lock_irq(&dev->power.lock);
+
+ if (!dev->power.request_pending)
+ goto out;
+
+ req = dev->power.request;
+ dev->power.request = RPM_REQ_NONE;
+ dev->power.request_pending = false;
+
+ switch (req) {
+ case RPM_REQ_NONE:
+ break;
+ case RPM_REQ_IDLE:
+ __pm_runtime_idle(dev);
+ break;
+ case RPM_REQ_SUSPEND:
+ __pm_runtime_suspend(dev, true);
+ break;
+ case RPM_REQ_RESUME:
+ __pm_runtime_resume(dev, true);
+ break;
+ }
+
+ out:
+ spin_unlock_irq(&dev->power.lock);
+}
+
+/**
+ * __pm_request_idle - Submit an idle notification request for given device.
+ * @dev: Device to handle.
+ *
+ * Check if the device's run-time PM status is correct for suspending the device
+ * and queue up a request to run __pm_runtime_idle() for it.
+ *
+ * This function must be called under dev->power.lock with interrupts disabled.
+ */
+static int __pm_request_idle(struct device *dev)
+{
+ int retval = 0;
+
+ if (dev->power.runtime_error)
+ retval = -EINVAL;
+ else if (atomic_read(&dev->power.usage_count) > 0
+ || dev->power.disable_depth > 0
+ || dev->power.runtime_status == RPM_SUSPENDED
+ || dev->power.runtime_status == RPM_SUSPENDING)
+ retval = -EAGAIN;
+ else if (!pm_children_suspended(dev))
+ retval = -EBUSY;
+ if (retval)
+ return retval;
+
+ if (dev->power.request_pending) {
+ /* Any requests other then RPM_REQ_IDLE take precedence. */
+ if (dev->power.request == RPM_REQ_NONE)
+ dev->power.request = RPM_REQ_IDLE;
+ else if (dev->power.request != RPM_REQ_IDLE)
+ retval = -EAGAIN;
+ return retval;
+ }
+
+ dev->power.request = RPM_REQ_IDLE;
+ dev->power.request_pending = true;
+ queue_work(pm_wq, &dev->power.work);
+
+ return retval;
+}
+
+/**
+ * pm_request_idle - Submit an idle notification request for given device.
+ * @dev: Device to handle.
+ */
+int pm_request_idle(struct device *dev)
+{
+ unsigned long flags;
+ int retval;
+
+ spin_lock_irqsave(&dev->power.lock, flags);
+ retval = __pm_request_idle(dev);
+ spin_unlock_irqrestore(&dev->power.lock, flags);
+
+ return retval;
+}
+EXPORT_SYMBOL_GPL(pm_request_idle);
+
+/**
+ * __pm_request_suspend - Submit a suspend request for given device.
+ * @dev: Device to suspend.
+ *
+ * This function must be called under dev->power.lock with interrupts disabled.
+ */
+static int __pm_request_suspend(struct device *dev)
+{
+ int retval = 0;
+
+ if (dev->power.runtime_error)
+ return -EINVAL;
+
+ if (dev->power.runtime_status == RPM_SUSPENDED)
+ retval = 1;
+ else if (atomic_read(&dev->power.usage_count) > 0
+ || dev->power.disable_depth > 0)
+ retval = -EAGAIN;
+ else if (dev->power.runtime_status == RPM_SUSPENDING)
+ retval = -EINPROGRESS;
+ else if (!pm_children_suspended(dev))
+ retval = -EBUSY;
+ if (retval < 0)
+ return retval;
+
+ pm_runtime_deactivate_timer(dev);
+
+ if (dev->power.request_pending) {
+ /*
+ * Pending resume requests take precedence over us, but we can
+ * overtake any other pending request.
+ */
+ if (dev->power.request == RPM_REQ_RESUME)
+ retval = -EAGAIN;
+ else if (dev->power.request != RPM_REQ_SUSPEND)
+ dev->power.request = retval ?
+ RPM_REQ_NONE : RPM_REQ_SUSPEND;
+ return retval;
+ } else if (retval) {
+ return retval;
+ }
+
+ dev->power.request = RPM_REQ_SUSPEND;
+ dev->power.request_pending = true;
+ queue_work(pm_wq, &dev->power.work);
+
+ return 0;
+}
+
+/**
+ * pm_suspend_timer_fn - Timer function for pm_schedule_suspend().
+ * @data: Device pointer passed by pm_schedule_suspend().
+ *
+ * Check if the time is right and execute __pm_request_suspend() in that case.
+ */
+static void pm_suspend_timer_fn(unsigned long data)
+{
+ struct device *dev = (struct device *)data;
+ unsigned long flags;
+ unsigned long expires;
+
+ spin_lock_irqsave(&dev->power.lock, flags);
+
+ expires = dev->power.timer_expires;
+ /* If 'expire' is after 'jiffies' we've been called too early. */
+ if (expires > 0 && !time_after(expires, jiffies)) {
+ dev->power.timer_expires = 0;
+ __pm_request_suspend(dev);
+ }
+
+ spin_unlock_irqrestore(&dev->power.lock, flags);
+}
+
+/**
+ * pm_schedule_suspend - Set up a timer to submit a suspend request in future.
+ * @dev: Device to suspend.
+ * @delay: Time to wait before submitting a suspend request, in milliseconds.
+ */
+int pm_schedule_suspend(struct device *dev, unsigned int delay)
+{
+ unsigned long flags;
+ int retval = 0;
+
+ spin_lock_irqsave(&dev->power.lock, flags);
+
+ if (dev->power.runtime_error) {
+ retval = -EINVAL;
+ goto out;
+ }
+
+ if (!delay) {
+ retval = __pm_request_suspend(dev);
+ goto out;
+ }
+
+ pm_runtime_deactivate_timer(dev);
+
+ if (dev->power.request_pending) {
+ /*
+ * Pending resume requests take precedence over us, but any
+ * other pending requests have to be canceled.
+ */
+ if (dev->power.request == RPM_REQ_RESUME) {
+ retval = -EAGAIN;
+ goto out;
+ }
+ dev->power.request = RPM_REQ_NONE;
+ }
+
+ if (dev->power.runtime_status == RPM_SUSPENDED)
+ retval = 1;
+ else if (dev->power.runtime_status == RPM_SUSPENDING)
+ retval = -EINPROGRESS;
+ else if (atomic_read(&dev->power.usage_count) > 0
+ || dev->power.disable_depth > 0)
+ retval = -EAGAIN;
+ else if (!pm_children_suspended(dev))
+ retval = -EBUSY;
+ if (retval)
+ goto out;
+
+ dev->power.timer_expires = jiffies + msecs_to_jiffies(delay);
+ mod_timer(&dev->power.suspend_timer, dev->power.timer_expires);
+
+ out:
+ spin_unlock_irqrestore(&dev->power.lock, flags);
+
+ return retval;
+}
+EXPORT_SYMBOL_GPL(pm_schedule_suspend);
+
+/**
+ * pm_request_resume - Submit a resume request for given device.
+ * @dev: Device to resume.
+ *
+ * This function must be called under dev->power.lock with interrupts disabled.
+ */
+static int __pm_request_resume(struct device *dev)
+{
+ int retval = 0;
+
+ if (dev->power.runtime_error)
+ return -EINVAL;
+
+ if (dev->power.runtime_status == RPM_ACTIVE)
+ retval = 1;
+ else if (dev->power.runtime_status == RPM_RESUMING)
+ retval = -EINPROGRESS;
+ else if (dev->power.disable_depth > 0)
+ retval = -EAGAIN;
+ if (retval < 0)
+ return retval;
+
+ pm_runtime_deactivate_timer(dev);
+
+ if (dev->power.request_pending) {
+ /* If non-resume request is pending, we can overtake it. */
+ dev->power.request = retval ? RPM_REQ_NONE : RPM_REQ_RESUME;
+ return retval;
+ } else if (retval) {
+ return retval;
+ }
+
+ dev->power.request = RPM_REQ_RESUME;
+ dev->power.request_pending = true;
+ queue_work(pm_wq, &dev->power.work);
+
+ return retval;
+}
+
+/**
+ * pm_request_resume - Submit a resume request for given device.
+ * @dev: Device to resume.
+ */
+int pm_request_resume(struct device *dev)
+{
+ unsigned long flags;
+ int retval;
+
+ spin_lock_irqsave(&dev->power.lock, flags);
+ retval = __pm_request_resume(dev);
+ spin_unlock_irqrestore(&dev->power.lock, flags);
+
+ return retval;
+}
+EXPORT_SYMBOL_GPL(pm_request_resume);
+
+/**
+ * __pm_runtime_get - Reference count a device and wake it up, if necessary.
+ * @dev: Device to handle.
+ * @sync: If set and the device is suspended, resume it synchronously.
+ *
+ * Increment the usage count of the device and if it was zero previously,
+ * resume it or submit a resume request for it, depending on the value of @sync.
+ */
+int __pm_runtime_get(struct device *dev, bool sync)
+{
+ int retval = 1;
+
+ if (atomic_add_return(1, &dev->power.usage_count) == 1)
+ retval = sync ? pm_runtime_resume(dev) : pm_request_resume(dev);
+
+ return retval;
+}
+EXPORT_SYMBOL_GPL(__pm_runtime_get);
+
+/**
+ * __pm_runtime_put - Decrement the device's usage counter and notify its bus.
+ * @dev: Device to handle.
+ * @sync: If the device's bus type is to be notified, do that synchronously.
+ *
+ * Decrement the usage count of the device and if it reaches zero, carry out a
+ * synchronous idle notification or submit an idle notification request for it,
+ * depending on the value of @sync.
+ */
+int __pm_runtime_put(struct device *dev, bool sync)
+{
+ int retval = 0;
+
+ if (atomic_dec_and_test(&dev->power.usage_count))
+ retval = sync ? pm_runtime_idle(dev) : pm_request_idle(dev);
+
+ return retval;
+}
+EXPORT_SYMBOL_GPL(__pm_runtime_put);
+
+/**
+ * __pm_runtime_set_status - Set run-time PM status of a device.
+ * @dev: Device to handle.
+ * @status: New run-time PM status of the device.
+ *
+ * If run-time PM of the device is disabled or its power.runtime_error field is
+ * different from zero, the status may be changed either to RPM_ACTIVE, or to
+ * RPM_SUSPENDED, as long as that reflects the actual state of the device.
+ * However, if the device has a parent and the parent is not active, and the
+ * parent's power.ignore_children flag is unset, the device's status cannot be
+ * set to RPM_ACTIVE, so -EBUSY is returned in that case.
+ *
+ * If successful, __pm_runtime_set_status() clears the power.runtime_error field
+ * and the device parent's counter of unsuspended children is modified to
+ * reflect the new status. If the new status is RPM_SUSPENDED, an idle
+ * notification request for the parent is submitted.
+ */
+int __pm_runtime_set_status(struct device *dev, unsigned int status)
+{
+ struct device *parent = dev->parent;
+ unsigned long flags;
+ bool notify_parent = false;
+ int error = 0;
+
+ if (status != RPM_ACTIVE && status != RPM_SUSPENDED)
+ return -EINVAL;
+
+ spin_lock_irqsave(&dev->power.lock, flags);
+
+ if (!dev->power.runtime_error && !dev->power.disable_depth) {
+ error = -EAGAIN;
+ goto out;
+ }
+
+ if (dev->power.runtime_status == status)
+ goto out_set;
+
+ if (status == RPM_SUSPENDED) {
+ /* It always is possible to set the status to 'suspended'. */
+ if (parent) {
+ atomic_add_unless(&parent->power.child_count, -1, 0);
+ notify_parent = !parent->power.ignore_children;
+ }
+ goto out_set;
+ }
+
+ if (parent) {
+ spin_lock_irq(&parent->power.lock);
+
+ /*
+ * It is invalid to put an active child under a parent that is
+ * not active, has run-time PM enabled and the
+ * 'power.ignore_children' flag unset.
+ */
+ if (!parent->power.disable_depth
+ && !parent->power.ignore_children
+ && parent->power.runtime_status != RPM_ACTIVE) {
+ error = -EBUSY;
+ } else {
+ if (dev->power.runtime_status == RPM_SUSPENDED)
+ atomic_inc(&parent->power.child_count);
+ }
+
+ spin_unlock_irq(&parent->power.lock);
+
+ if (error)
+ goto out;
+ }
+
+ out_set:
+ dev->power.runtime_status = status;
+ dev->power.runtime_error = 0;
+ out:
+ spin_unlock_irqrestore(&dev->power.lock, flags);
+
+ if (notify_parent)
+ pm_request_idle(parent);
+
+ return error;
+}
+EXPORT_SYMBOL_GPL(__pm_runtime_set_status);
+
+/**
+ * __pm_runtime_barrier - Cancel pending requests and wait for completions.
+ * @dev: Device to handle.
+ *
+ * Flush all pending requests for the device from pm_wq and wait for all
+ * run-time PM operations involving the device in progress to complete.
+ *
+ * Should be called under dev->power.lock with interrupts disabled.
+ */
+static void __pm_runtime_barrier(struct device *dev)
+{
+ pm_runtime_deactivate_timer(dev);
+
+ if (dev->power.request_pending) {
+ dev->power.request = RPM_REQ_NONE;
+ spin_unlock_irq(&dev->power.lock);
+
+ cancel_work_sync(&dev->power.work);
+
+ spin_lock_irq(&dev->power.lock);
+ dev->power.request_pending = false;
+ }
+
+ if (dev->power.runtime_status == RPM_SUSPENDING
+ || dev->power.runtime_status == RPM_RESUMING
+ || dev->power.idle_notification) {
+ DEFINE_WAIT(wait);
+
+ /* Suspend, wake-up or idle notification in progress. */
+ for (;;) {
+ prepare_to_wait(&dev->power.wait_queue, &wait,
+ TASK_UNINTERRUPTIBLE);
+ if (dev->power.runtime_status != RPM_SUSPENDING
+ && dev->power.runtime_status != RPM_RESUMING
+ && !dev->power.idle_notification)
+ break;
+ spin_unlock_irq(&dev->power.lock);
+
+ schedule();
+
+ spin_lock_irq(&dev->power.lock);
+ }
+ finish_wait(&dev->power.wait_queue, &wait);
+ }
+}
+
+/**
+ * pm_runtime_barrier - Flush pending requests and wait for completions.
+ * @dev: Device to handle.
+ *
+ * Prevent the device from being suspended by incrementing its usage counter and
+ * if there's a pending resume request for the device, wake the device up.
+ * Next, make sure that all pending requests for the device have been flushed
+ * from pm_wq and wait for all run-time PM operations involving the device in
+ * progress to complete.
+ *
+ * Return value:
+ * 1, if there was a resume request pending and the device had to be woken up,
+ * 0, otherwise
+ */
+int pm_runtime_barrier(struct device *dev)
+{
+ int retval = 0;
+
+ pm_runtime_get_noresume(dev);
+ spin_lock_irq(&dev->power.lock);
+
+ if (dev->power.request_pending
+ && dev->power.request == RPM_REQ_RESUME) {
+ __pm_runtime_resume(dev, false);
+ retval = 1;
+ }
+
+ __pm_runtime_barrier(dev);
+
+ spin_unlock_irq(&dev->power.lock);
+ pm_runtime_put_noidle(dev);
+
+ return retval;
+}
+EXPORT_SYMBOL_GPL(pm_runtime_barrier);
+
+/**
+ * __pm_runtime_disable - Disable run-time PM of a device.
+ * @dev: Device to handle.
+ * @check_resume: If set, check if there's a resume request for the device.
+ *
+ * Increment power.disable_depth for the device and if was zero previously,
+ * cancel all pending run-time PM requests for the device and wait for all
+ * operations in progress to complete. The device can be either active or
+ * suspended after its run-time PM has been disabled.
+ *
+ * If @check_resume is set and there's a resume request pending when
+ * __pm_runtime_disable() is called and power.disable_depth is zero, the
+ * function will wake up the device before disabling its run-time PM.
+ */
+void __pm_runtime_disable(struct device *dev, bool check_resume)
+{
+ spin_lock_irq(&dev->power.lock);
+
+ if (dev->power.disable_depth > 0) {
+ dev->power.disable_depth++;
+ goto out;
+ }
+
+ /*
+ * Wake up the device if there's a resume request pending, because that
+ * means there probably is some I/O to process and disabling run-time PM
+ * shouldn't prevent the device from processing the I/O.
+ */
+ if (check_resume && dev->power.request_pending
+ && dev->power.request == RPM_REQ_RESUME) {
+ /*
+ * Prevent suspends and idle notifications from being carried
+ * out after we have woken up the device.
+ */
+ pm_runtime_get_noresume(dev);
+
+ __pm_runtime_resume(dev, false);
+
+ pm_runtime_put_noidle(dev);
+ }
+
+ if (!dev->power.disable_depth++)
+ __pm_runtime_barrier(dev);
+
+ out:
+ spin_unlock_irq(&dev->power.lock);
+}
+EXPORT_SYMBOL_GPL(__pm_runtime_disable);
+
+/**
+ * pm_runtime_enable - Enable run-time PM of a device.
+ * @dev: Device to handle.
+ */
+void pm_runtime_enable(struct device *dev)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev->power.lock, flags);
+
+ if (dev->power.disable_depth > 0)
+ dev->power.disable_depth--;
+ else
+ dev_warn(dev, "Unbalanced %s!\n", __func__);
+
+ spin_unlock_irqrestore(&dev->power.lock, flags);
+}
+EXPORT_SYMBOL_GPL(pm_runtime_enable);
+
+/**
+ * pm_runtime_init - Initialize run-time PM fields in given device object.
+ * @dev: Device object to initialize.
+ */
+void pm_runtime_init(struct device *dev)
+{
+ spin_lock_init(&dev->power.lock);
+
+ dev->power.runtime_status = RPM_SUSPENDED;
+ dev->power.idle_notification = false;
+
+ dev->power.disable_depth = 1;
+ atomic_set(&dev->power.usage_count, 0);
+
+ dev->power.runtime_error = 0;
+
+ atomic_set(&dev->power.child_count, 0);
+ pm_suspend_ignore_children(dev, false);
+
+ dev->power.request_pending = false;
+ dev->power.request = RPM_REQ_NONE;
+ dev->power.deferred_resume = false;
+ INIT_WORK(&dev->power.work, pm_runtime_work);
+
+ dev->power.timer_expires = 0;
+ setup_timer(&dev->power.suspend_timer, pm_suspend_timer_fn,
+ (unsigned long)dev);
+
+ init_waitqueue_head(&dev->power.wait_queue);
+}
+
+/**
+ * pm_runtime_remove - Prepare for removing a device from device hierarchy.
+ * @dev: Device object being removed from device hierarchy.
+ */
+void pm_runtime_remove(struct device *dev)
+{
+ __pm_runtime_disable(dev, false);
+
+ /* Change the status back to 'suspended' to match the initial status. */
+ if (dev->power.runtime_status == RPM_ACTIVE)
+ pm_runtime_set_suspended(dev);
+}
{
}
-static int floppy_resume(struct platform_device *dev)
+static int floppy_resume(struct device *dev)
{
int fdc;
return 0;
}
-static struct platform_driver floppy_driver = {
+static struct dev_pm_ops floppy_pm_ops = {
.resume = floppy_resume,
+ .restore = floppy_resume,
+};
+
+static struct platform_driver floppy_driver = {
.driver = {
.name = "floppy",
+ .pm = &floppy_pm_ops,
},
};
clk_disable(atdma->clk);
}
-static int at_dma_suspend_late(struct platform_device *pdev, pm_message_t mesg)
+static int at_dma_suspend_noirq(struct device *dev)
{
- struct at_dma *atdma = platform_get_drvdata(pdev);
+ struct platform_device *pdev = to_platform_device(dev);
+ struct at_dma *atdma = platform_get_drvdata(pdev);
at_dma_off(platform_get_drvdata(pdev));
clk_disable(atdma->clk);
return 0;
}
-static int at_dma_resume_early(struct platform_device *pdev)
+static int at_dma_resume_noirq(struct device *dev)
{
- struct at_dma *atdma = platform_get_drvdata(pdev);
+ struct platform_device *pdev = to_platform_device(dev);
+ struct at_dma *atdma = platform_get_drvdata(pdev);
clk_enable(atdma->clk);
dma_writel(atdma, EN, AT_DMA_ENABLE);
return 0;
-
}
+static struct dev_pm_ops at_dma_dev_pm_ops = {
+ .suspend_noirq = at_dma_suspend_noirq,
+ .resume_noirq = at_dma_resume_noirq,
+};
+
static struct platform_driver at_dma_driver = {
.remove = __exit_p(at_dma_remove),
.shutdown = at_dma_shutdown,
- .suspend_late = at_dma_suspend_late,
- .resume_early = at_dma_resume_early,
.driver = {
.name = "at_hdmac",
+ .pm = &at_dma_dev_pm_ops,
},
};
clk_disable(dw->clk);
}
-static int dw_suspend_late(struct platform_device *pdev, pm_message_t mesg)
+static int dw_suspend_noirq(struct device *dev)
{
+ struct platform_device *pdev = to_platform_device(dev);
struct dw_dma *dw = platform_get_drvdata(pdev);
dw_dma_off(platform_get_drvdata(pdev));
return 0;
}
-static int dw_resume_early(struct platform_device *pdev)
+static int dw_resume_noirq(struct device *dev)
{
+ struct platform_device *pdev = to_platform_device(dev);
struct dw_dma *dw = platform_get_drvdata(pdev);
clk_enable(dw->clk);
dma_writel(dw, CFG, DW_CFG_DMA_EN);
return 0;
-
}
+static struct dev_pm_ops dw_dev_pm_ops = {
+ .suspend_noirq = dw_suspend_noirq,
+ .resume_noirq = dw_resume_noirq,
+};
+
static struct platform_driver dw_driver = {
.remove = __exit_p(dw_remove),
.shutdown = dw_shutdown,
- .suspend_late = dw_suspend_late,
- .resume_early = dw_resume_early,
.driver = {
.name = "dw_dmac",
+ .pm = &dw_dev_pm_ops,
},
};
txx9dmac_off(ddev);
}
-static int txx9dmac_suspend_late(struct platform_device *pdev,
- pm_message_t mesg)
+static int txx9dmac_suspend_noirq(struct device *dev)
{
+ struct platform_device *pdev = to_platform_device(dev);
struct txx9dmac_dev *ddev = platform_get_drvdata(pdev);
txx9dmac_off(ddev);
return 0;
}
-static int txx9dmac_resume_early(struct platform_device *pdev)
+static int txx9dmac_resume_noirq(struct device *dev)
{
+ struct platform_device *pdev = to_platform_device(dev);
struct txx9dmac_dev *ddev = platform_get_drvdata(pdev);
struct txx9dmac_platform_data *pdata = pdev->dev.platform_data;
u32 mcr;
}
+static struct dev_pm_ops txx9dmac_dev_pm_ops = {
+ .suspend_noirq = txx9dmac_suspend_noirq,
+ .resume_noirq = txx9dmac_resume_noirq,
+};
+
static struct platform_driver txx9dmac_chan_driver = {
.remove = __exit_p(txx9dmac_chan_remove),
.driver = {
static struct platform_driver txx9dmac_driver = {
.remove = __exit_p(txx9dmac_remove),
.shutdown = txx9dmac_shutdown,
- .suspend_late = txx9dmac_suspend_late,
- .resume_early = txx9dmac_resume_early,
.driver = {
.name = "txx9dmac",
+ .pm = &txx9dmac_dev_pm_ops,
},
};
}
#ifdef CONFIG_PM
-static int i2c_pxa_suspend_late(struct platform_device *dev, pm_message_t state)
+static int i2c_pxa_suspend_noirq(struct device *dev)
{
- struct pxa_i2c *i2c = platform_get_drvdata(dev);
+ struct platform_device *pdev = to_platform_device(dev);
+ struct pxa_i2c *i2c = platform_get_drvdata(pdev);
+
clk_disable(i2c->clk);
+
return 0;
}
-static int i2c_pxa_resume_early(struct platform_device *dev)
+static int i2c_pxa_resume_noirq(struct device *dev)
{
- struct pxa_i2c *i2c = platform_get_drvdata(dev);
+ struct platform_device *pdev = to_platform_device(dev);
+ struct pxa_i2c *i2c = platform_get_drvdata(pdev);
clk_enable(i2c->clk);
i2c_pxa_reset(i2c);
return 0;
}
+
+static struct dev_pm_ops i2c_pxa_dev_pm_ops = {
+ .suspend_noirq = i2c_pxa_suspend_noirq,
+ .resume_noirq = i2c_pxa_resume_noirq,
+};
+
+#define I2C_PXA_DEV_PM_OPS (&i2c_pxa_dev_pm_ops)
#else
-#define i2c_pxa_suspend_late NULL
-#define i2c_pxa_resume_early NULL
+#define I2C_PXA_DEV_PM_OPS NULL
#endif
static struct platform_driver i2c_pxa_driver = {
.probe = i2c_pxa_probe,
.remove = __exit_p(i2c_pxa_remove),
- .suspend_late = i2c_pxa_suspend_late,
- .resume_early = i2c_pxa_resume_early,
.driver = {
.name = "pxa2xx-i2c",
.owner = THIS_MODULE,
+ .pm = I2C_PXA_DEV_PM_OPS,
},
.id_table = i2c_pxa_id_table,
};
}
#ifdef CONFIG_PM
-static int s3c24xx_i2c_suspend_late(struct platform_device *dev,
- pm_message_t msg)
+static int s3c24xx_i2c_suspend_noirq(struct device *dev)
{
- struct s3c24xx_i2c *i2c = platform_get_drvdata(dev);
+ struct platform_device *pdev = to_platform_device(dev);
+ struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev);
+
i2c->suspended = 1;
+
return 0;
}
-static int s3c24xx_i2c_resume(struct platform_device *dev)
+static int s3c24xx_i2c_resume(struct device *dev)
{
- struct s3c24xx_i2c *i2c = platform_get_drvdata(dev);
+ struct platform_device *pdev = to_platform_device(dev);
+ struct s3c24xx_i2c *i2c = platform_get_drvdata(pdev);
i2c->suspended = 0;
s3c24xx_i2c_init(i2c);
return 0;
}
+static struct dev_pm_ops s3c24xx_i2c_dev_pm_ops = {
+ .suspend_noirq = s3c24xx_i2c_suspend_noirq,
+ .resume = s3c24xx_i2c_resume,
+};
+
+#define S3C24XX_DEV_PM_OPS (&s3c24xx_i2c_dev_pm_ops)
#else
-#define s3c24xx_i2c_suspend_late NULL
-#define s3c24xx_i2c_resume NULL
+#define S3C24XX_DEV_PM_OPS NULL
#endif
/* device driver for platform bus bits */
static struct platform_driver s3c24xx_i2c_driver = {
.probe = s3c24xx_i2c_probe,
.remove = s3c24xx_i2c_remove,
- .suspend_late = s3c24xx_i2c_suspend_late,
- .resume = s3c24xx_i2c_resume,
.id_table = s3c24xx_driver_ids,
.driver = {
.owner = THIS_MODULE,
.name = "s3c-i2c",
+ .pm = S3C24XX_DEV_PM_OPS,
},
};
static int __init hp_wmi_bios_setup(struct platform_device *device);
static int __exit hp_wmi_bios_remove(struct platform_device *device);
-static int hp_wmi_resume_handler(struct platform_device *device);
+static int hp_wmi_resume_handler(struct device *device);
struct bios_args {
u32 signature;
static struct rfkill *bluetooth_rfkill;
static struct rfkill *wwan_rfkill;
+static struct dev_pm_ops hp_wmi_pm_ops = {
+ .resume = hp_wmi_resume_handler,
+ .restore = hp_wmi_resume_handler,
+};
+
static struct platform_driver hp_wmi_driver = {
.driver = {
- .name = "hp-wmi",
- .owner = THIS_MODULE,
+ .name = "hp-wmi",
+ .owner = THIS_MODULE,
+ .pm = &hp_wmi_pm_ops,
},
.probe = hp_wmi_bios_setup,
.remove = hp_wmi_bios_remove,
- .resume = hp_wmi_resume_handler,
};
static int hp_wmi_perform_query(int query, int write, int value)
return 0;
}
-static int hp_wmi_resume_handler(struct platform_device *device)
+static int hp_wmi_resume_handler(struct device *device)
{
/*
* Hardware state may have changed while suspended, so trigger
#ifdef CONFIG_PM
-static int musb_suspend(struct platform_device *pdev, pm_message_t message)
+static int musb_suspend(struct device *dev)
{
+ struct platform_device *pdev = to_platform_device(dev);
unsigned long flags;
struct musb *musb = dev_to_musb(&pdev->dev);
return 0;
}
-static int musb_resume_early(struct platform_device *pdev)
+static int musb_resume_noirq(struct device *dev)
{
+ struct platform_device *pdev = to_platform_device(dev);
struct musb *musb = dev_to_musb(&pdev->dev);
if (!musb->clock)
return 0;
}
+static struct dev_pm_ops musb_dev_pm_ops = {
+ .suspend = musb_suspend,
+ .resume_noirq = musb_resume_noirq,
+};
+
+#define MUSB_DEV_PM_OPS (&musb_dev_pm_ops)
#else
-#define musb_suspend NULL
-#define musb_resume_early NULL
+#define MUSB_DEV_PM_OPS NULL
#endif
static struct platform_driver musb_driver = {
.name = (char *)musb_driver_name,
.bus = &platform_bus_type,
.owner = THIS_MODULE,
+ .pm = MUSB_DEV_PM_OPS,
},
.remove = __devexit_p(musb_remove),
.shutdown = musb_shutdown,
- .suspend = musb_suspend,
- .resume_early = musb_resume_early,
};
/*-------------------------------------------------------------------------*/
struct dev_archdata {
};
+struct pdev_archdata {
+};
+
#endif /* _ASM_GENERIC_DEVICE_H */
struct resource * resource;
struct platform_device_id *id_entry;
+
+ /* arch specific additions */
+ struct pdev_archdata archdata;
};
#define platform_get_device_id(pdev) ((pdev)->id_entry)
int (*remove)(struct platform_device *);
void (*shutdown)(struct platform_device *);
int (*suspend)(struct platform_device *, pm_message_t state);
- int (*suspend_late)(struct platform_device *, pm_message_t state);
- int (*resume_early)(struct platform_device *);
int (*resume)(struct platform_device *);
struct device_driver driver;
struct platform_device_id *id_table;
#define _LINUX_PM_H
#include <linux/list.h>
+#include <linux/workqueue.h>
+#include <linux/spinlock.h>
+#include <linux/wait.h>
+#include <linux/timer.h>
/*
* Callbacks for platform drivers to implement.
* It is allowed to unregister devices while the above callbacks are being
* executed. However, it is not allowed to unregister a device from within any
* of its own callbacks.
+ *
+ * There also are the following callbacks related to run-time power management
+ * of devices:
+ *
+ * @runtime_suspend: Prepare the device for a condition in which it won't be
+ * able to communicate with the CPU(s) and RAM due to power management.
+ * This need not mean that the device should be put into a low power state.
+ * For example, if the device is behind a link which is about to be turned
+ * off, the device may remain at full power. If the device does go to low
+ * power and if device_may_wakeup(dev) is true, remote wake-up (i.e., a
+ * hardware mechanism allowing the device to request a change of its power
+ * state, such as PCI PME) should be enabled for it.
+ *
+ * @runtime_resume: Put the device into the fully active state in response to a
+ * wake-up event generated by hardware or at the request of software. If
+ * necessary, put the device into the full power state and restore its
+ * registers, so that it is fully operational.
+ *
+ * @runtime_idle: Device appears to be inactive and it might be put into a low
+ * power state if all of the necessary conditions are satisfied. Check
+ * these conditions and handle the device as appropriate, possibly queueing
+ * a suspend request for it. The return value is ignored by the PM core.
*/
struct dev_pm_ops {
int (*thaw_noirq)(struct device *dev);
int (*poweroff_noirq)(struct device *dev);
int (*restore_noirq)(struct device *dev);
+ int (*runtime_suspend)(struct device *dev);
+ int (*runtime_resume)(struct device *dev);
+ int (*runtime_idle)(struct device *dev);
};
+/*
+ * Use this if you want to use the same suspend and resume callbacks for suspend
+ * to RAM and hibernation.
+ */
+#define SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn) \
+struct dev_pm_ops name = { \
+ .suspend = suspend_fn, \
+ .resume = resume_fn, \
+ .freeze = suspend_fn, \
+ .thaw = resume_fn, \
+ .poweroff = suspend_fn, \
+ .restore = resume_fn, \
+}
+
/**
* PM_EVENT_ messages
*
DPM_OFF_IRQ,
};
+/**
+ * Device run-time power management status.
+ *
+ * These status labels are used internally by the PM core to indicate the
+ * current status of a device with respect to the PM core operations. They do
+ * not reflect the actual power state of the device or its status as seen by the
+ * driver.
+ *
+ * RPM_ACTIVE Device is fully operational. Indicates that the device
+ * bus type's ->runtime_resume() callback has completed
+ * successfully.
+ *
+ * RPM_SUSPENDED Device bus type's ->runtime_suspend() callback has
+ * completed successfully. The device is regarded as
+ * suspended.
+ *
+ * RPM_RESUMING Device bus type's ->runtime_resume() callback is being
+ * executed.
+ *
+ * RPM_SUSPENDING Device bus type's ->runtime_suspend() callback is being
+ * executed.
+ */
+
+enum rpm_status {
+ RPM_ACTIVE = 0,
+ RPM_RESUMING,
+ RPM_SUSPENDED,
+ RPM_SUSPENDING,
+};
+
+/**
+ * Device run-time power management request types.
+ *
+ * RPM_REQ_NONE Do nothing.
+ *
+ * RPM_REQ_IDLE Run the device bus type's ->runtime_idle() callback
+ *
+ * RPM_REQ_SUSPEND Run the device bus type's ->runtime_suspend() callback
+ *
+ * RPM_REQ_RESUME Run the device bus type's ->runtime_resume() callback
+ */
+
+enum rpm_request {
+ RPM_REQ_NONE = 0,
+ RPM_REQ_IDLE,
+ RPM_REQ_SUSPEND,
+ RPM_REQ_RESUME,
+};
+
struct dev_pm_info {
pm_message_t power_state;
- unsigned can_wakeup:1;
- unsigned should_wakeup:1;
+ unsigned int can_wakeup:1;
+ unsigned int should_wakeup:1;
enum dpm_state status; /* Owned by the PM core */
-#ifdef CONFIG_PM_SLEEP
+#ifdef CONFIG_PM_SLEEP
struct list_head entry;
#endif
+#ifdef CONFIG_PM_RUNTIME
+ struct timer_list suspend_timer;
+ unsigned long timer_expires;
+ struct work_struct work;
+ wait_queue_head_t wait_queue;
+ spinlock_t lock;
+ atomic_t usage_count;
+ atomic_t child_count;
+ unsigned int disable_depth:3;
+ unsigned int ignore_children:1;
+ unsigned int idle_notification:1;
+ unsigned int request_pending:1;
+ unsigned int deferred_resume:1;
+ enum rpm_request request;
+ enum rpm_status runtime_status;
+ int runtime_error;
+#endif
};
/*
--- /dev/null
+/*
+ * pm_runtime.h - Device run-time power management helper functions.
+ *
+ * Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>
+ *
+ * This file is released under the GPLv2.
+ */
+
+#ifndef _LINUX_PM_RUNTIME_H
+#define _LINUX_PM_RUNTIME_H
+
+#include <linux/device.h>
+#include <linux/pm.h>
+
+#ifdef CONFIG_PM_RUNTIME
+
+extern struct workqueue_struct *pm_wq;
+
+extern int pm_runtime_idle(struct device *dev);
+extern int pm_runtime_suspend(struct device *dev);
+extern int pm_runtime_resume(struct device *dev);
+extern int pm_request_idle(struct device *dev);
+extern int pm_schedule_suspend(struct device *dev, unsigned int delay);
+extern int pm_request_resume(struct device *dev);
+extern int __pm_runtime_get(struct device *dev, bool sync);
+extern int __pm_runtime_put(struct device *dev, bool sync);
+extern int __pm_runtime_set_status(struct device *dev, unsigned int status);
+extern int pm_runtime_barrier(struct device *dev);
+extern void pm_runtime_enable(struct device *dev);
+extern void __pm_runtime_disable(struct device *dev, bool check_resume);
+
+static inline bool pm_children_suspended(struct device *dev)
+{
+ return dev->power.ignore_children
+ || !atomic_read(&dev->power.child_count);
+}
+
+static inline void pm_suspend_ignore_children(struct device *dev, bool enable)
+{
+ dev->power.ignore_children = enable;
+}
+
+static inline void pm_runtime_get_noresume(struct device *dev)
+{
+ atomic_inc(&dev->power.usage_count);
+}
+
+static inline void pm_runtime_put_noidle(struct device *dev)
+{
+ atomic_add_unless(&dev->power.usage_count, -1, 0);
+}
+
+#else /* !CONFIG_PM_RUNTIME */
+
+static inline int pm_runtime_idle(struct device *dev) { return -ENOSYS; }
+static inline int pm_runtime_suspend(struct device *dev) { return -ENOSYS; }
+static inline int pm_runtime_resume(struct device *dev) { return 0; }
+static inline int pm_request_idle(struct device *dev) { return -ENOSYS; }
+static inline int pm_schedule_suspend(struct device *dev, unsigned int delay)
+{
+ return -ENOSYS;
+}
+static inline int pm_request_resume(struct device *dev) { return 0; }
+static inline int __pm_runtime_get(struct device *dev, bool sync) { return 1; }
+static inline int __pm_runtime_put(struct device *dev, bool sync) { return 0; }
+static inline int __pm_runtime_set_status(struct device *dev,
+ unsigned int status) { return 0; }
+static inline int pm_runtime_barrier(struct device *dev) { return 0; }
+static inline void pm_runtime_enable(struct device *dev) {}
+static inline void __pm_runtime_disable(struct device *dev, bool c) {}
+
+static inline bool pm_children_suspended(struct device *dev) { return false; }
+static inline void pm_suspend_ignore_children(struct device *dev, bool en) {}
+static inline void pm_runtime_get_noresume(struct device *dev) {}
+static inline void pm_runtime_put_noidle(struct device *dev) {}
+
+#endif /* !CONFIG_PM_RUNTIME */
+
+static inline int pm_runtime_get(struct device *dev)
+{
+ return __pm_runtime_get(dev, false);
+}
+
+static inline int pm_runtime_get_sync(struct device *dev)
+{
+ return __pm_runtime_get(dev, true);
+}
+
+static inline int pm_runtime_put(struct device *dev)
+{
+ return __pm_runtime_put(dev, false);
+}
+
+static inline int pm_runtime_put_sync(struct device *dev)
+{
+ return __pm_runtime_put(dev, true);
+}
+
+static inline int pm_runtime_set_active(struct device *dev)
+{
+ return __pm_runtime_set_status(dev, RPM_ACTIVE);
+}
+
+static inline void pm_runtime_set_suspended(struct device *dev)
+{
+ __pm_runtime_set_status(dev, RPM_SUSPENDED);
+}
+
+static inline void pm_runtime_disable(struct device *dev)
+{
+ __pm_runtime_disable(dev, true);
+}
+
+#endif
random kernel OOPSes or reboots that don't seem to be related to
anything, try disabling/enabling this option (or disabling/enabling
APM in your BIOS).
+
+config PM_RUNTIME
+ bool "Run-time PM core functionality"
+ depends on PM
+ ---help---
+ Enable functionality allowing I/O devices to be put into energy-saving
+ (low power) states at run time (or autosuspended) after a specified
+ period of inactivity and woken up in response to a hardware-generated
+ wake-up event or a driver's request.
+
+ Hardware support is generally required for this functionality to work
+ and the bus type drivers of the buses the devices are on are
+ responsible for the actual handling of the autosuspend requests and
+ wake-up events.
if (error)
return error;
- /* Free memory before shutting down devices. */
- error = swsusp_shrink_memory();
+ /* Preallocate image memory before shutting down devices. */
+ error = hibernate_preallocate_memory();
if (error)
goto Close;
/* Control returns here after successful restore */
Resume_devices:
+ /* We may need to release the preallocated image pages here. */
+ if (error || !in_suspend)
+ swsusp_free();
+
dpm_resume_end(in_suspend ?
(error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
resume_console();
error = hibernation_ops->prepare();
if (error)
- goto Platofrm_finish;
+ goto Platform_finish;
error = disable_nonboot_cpus();
if (error)
- goto Platofrm_finish;
+ goto Platform_finish;
local_irq_disable();
sysdev_suspend(PMSG_HIBERNATE);
* We don't need to reenable the nonboot CPUs or resume consoles, since
* the system is going to be halted anyway.
*/
- Platofrm_finish:
+ Platform_finish:
hibernation_ops->finish();
dpm_suspend_noirq(PMSG_RESTORE);
goto Thaw;
error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
- if (in_suspend && !error) {
+ if (error)
+ goto Thaw;
+
+ if (in_suspend) {
unsigned int flags = 0;
if (hibernation_mode == HIBERNATION_PLATFORM)
power_down();
} else {
pr_debug("PM: Image restored successfully.\n");
- swsusp_free();
}
+
Thaw:
thaw_processes();
Finish:
#include <linux/kobject.h>
#include <linux/string.h>
#include <linux/resume-trace.h>
+#include <linux/workqueue.h>
#include "power.h"
.attrs = g,
};
+#ifdef CONFIG_PM_RUNTIME
+struct workqueue_struct *pm_wq;
+
+static int __init pm_start_workqueue(void)
+{
+ pm_wq = create_freezeable_workqueue("pm");
+
+ return pm_wq ? 0 : -ENOMEM;
+}
+#else
+static inline int pm_start_workqueue(void) { return 0; }
+#endif
+
static int __init pm_init(void)
{
+ int error = pm_start_workqueue();
+ if (error)
+ return error;
power_kobj = kobject_create_and_add("power", NULL);
if (!power_kobj)
return -ENOMEM;
extern int create_basic_memory_bitmaps(void);
extern void free_basic_memory_bitmaps(void);
-extern int swsusp_shrink_memory(void);
+extern int hibernate_preallocate_memory(void);
/**
* Auxiliary structure used for reading the snapshot image data and
#define BM_END_OF_MAP (~0UL)
-#define BM_BITS_PER_BLOCK (PAGE_SIZE << 3)
+#define BM_BITS_PER_BLOCK (PAGE_SIZE * BITS_PER_BYTE)
struct bm_block {
struct list_head hook; /* hook into a list of bitmap blocks */
/**
* create_bm_block_list - create a list of block bitmap objects
- * @nr_blocks - number of blocks to allocate
+ * @pages - number of pages to track
* @list - list to put the allocated blocks into
* @ca - chain allocator to be used for allocating memory
*/
struct zone *zone;
unsigned int n = 0;
- for_each_zone(zone) {
+ for_each_populated_zone(zone) {
unsigned long pfn, max_zone_pfn;
if (!is_highmem(zone))
unsigned long pfn, max_zone_pfn;
unsigned int n = 0;
- for_each_zone(zone) {
+ for_each_populated_zone(zone) {
if (is_highmem(zone))
continue;
struct zone *zone;
unsigned long pfn;
- for_each_zone(zone) {
+ for_each_populated_zone(zone) {
unsigned long max_zone_pfn;
mark_free_pages(zone);
static unsigned int nr_copy_pages;
/* Number of pages needed for saving the original pfns of the image pages */
static unsigned int nr_meta_pages;
+/*
+ * Numbers of normal and highmem page frames allocated for hibernation image
+ * before suspending devices.
+ */
+unsigned int alloc_normal, alloc_highmem;
+/*
+ * Memory bitmap used for marking saveable pages (during hibernation) or
+ * hibernation image pages (during restore)
+ */
+static struct memory_bitmap orig_bm;
+/*
+ * Memory bitmap used during hibernation for marking allocated page frames that
+ * will contain copies of saveable pages. During restore it is initially used
+ * for marking hibernation image pages, but then the set bits from it are
+ * duplicated in @orig_bm and it is released. On highmem systems it is next
+ * used for marking "safe" highmem pages, but it has to be reinitialized for
+ * this purpose.
+ */
+static struct memory_bitmap copy_bm;
/**
* swsusp_free - free pages allocated for the suspend.
struct zone *zone;
unsigned long pfn, max_zone_pfn;
- for_each_zone(zone) {
+ for_each_populated_zone(zone) {
max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
if (pfn_valid(pfn)) {
nr_meta_pages = 0;
restore_pblist = NULL;
buffer = NULL;
+ alloc_normal = 0;
+ alloc_highmem = 0;
}
+/* Helper functions used for the shrinking of memory. */
+
+#define GFP_IMAGE (GFP_KERNEL | __GFP_NOWARN)
+
/**
- * swsusp_shrink_memory - Try to free as much memory as needed
- *
- * ... but do not OOM-kill anyone
+ * preallocate_image_pages - Allocate a number of pages for hibernation image
+ * @nr_pages: Number of page frames to allocate.
+ * @mask: GFP flags to use for the allocation.
*
- * Notice: all userland should be stopped before it is called, or
- * livelock is possible.
+ * Return value: Number of page frames actually allocated
+ */
+static unsigned long preallocate_image_pages(unsigned long nr_pages, gfp_t mask)
+{
+ unsigned long nr_alloc = 0;
+
+ while (nr_pages > 0) {
+ struct page *page;
+
+ page = alloc_image_page(mask);
+ if (!page)
+ break;
+ memory_bm_set_bit(©_bm, page_to_pfn(page));
+ if (PageHighMem(page))
+ alloc_highmem++;
+ else
+ alloc_normal++;
+ nr_pages--;
+ nr_alloc++;
+ }
+
+ return nr_alloc;
+}
+
+static unsigned long preallocate_image_memory(unsigned long nr_pages)
+{
+ return preallocate_image_pages(nr_pages, GFP_IMAGE);
+}
+
+#ifdef CONFIG_HIGHMEM
+static unsigned long preallocate_image_highmem(unsigned long nr_pages)
+{
+ return preallocate_image_pages(nr_pages, GFP_IMAGE | __GFP_HIGHMEM);
+}
+
+/**
+ * __fraction - Compute (an approximation of) x * (multiplier / base)
*/
+static unsigned long __fraction(u64 x, u64 multiplier, u64 base)
+{
+ x *= multiplier;
+ do_div(x, base);
+ return (unsigned long)x;
+}
+
+static unsigned long preallocate_highmem_fraction(unsigned long nr_pages,
+ unsigned long highmem,
+ unsigned long total)
+{
+ unsigned long alloc = __fraction(nr_pages, highmem, total);
-#define SHRINK_BITE 10000
-static inline unsigned long __shrink_memory(long tmp)
+ return preallocate_image_pages(alloc, GFP_IMAGE | __GFP_HIGHMEM);
+}
+#else /* CONFIG_HIGHMEM */
+static inline unsigned long preallocate_image_highmem(unsigned long nr_pages)
{
- if (tmp > SHRINK_BITE)
- tmp = SHRINK_BITE;
- return shrink_all_memory(tmp);
+ return 0;
}
-int swsusp_shrink_memory(void)
+static inline unsigned long preallocate_highmem_fraction(unsigned long nr_pages,
+ unsigned long highmem,
+ unsigned long total)
+{
+ return 0;
+}
+#endif /* CONFIG_HIGHMEM */
+
+/**
+ * free_unnecessary_pages - Release preallocated pages not needed for the image
+ */
+static void free_unnecessary_pages(void)
+{
+ unsigned long save_highmem, to_free_normal, to_free_highmem;
+
+ to_free_normal = alloc_normal - count_data_pages();
+ save_highmem = count_highmem_pages();
+ if (alloc_highmem > save_highmem) {
+ to_free_highmem = alloc_highmem - save_highmem;
+ } else {
+ to_free_highmem = 0;
+ to_free_normal -= save_highmem - alloc_highmem;
+ }
+
+ memory_bm_position_reset(©_bm);
+
+ while (to_free_normal > 0 && to_free_highmem > 0) {
+ unsigned long pfn = memory_bm_next_pfn(©_bm);
+ struct page *page = pfn_to_page(pfn);
+
+ if (PageHighMem(page)) {
+ if (!to_free_highmem)
+ continue;
+ to_free_highmem--;
+ alloc_highmem--;
+ } else {
+ if (!to_free_normal)
+ continue;
+ to_free_normal--;
+ alloc_normal--;
+ }
+ memory_bm_clear_bit(©_bm, pfn);
+ swsusp_unset_page_forbidden(page);
+ swsusp_unset_page_free(page);
+ __free_page(page);
+ }
+}
+
+/**
+ * minimum_image_size - Estimate the minimum acceptable size of an image
+ * @saveable: Number of saveable pages in the system.
+ *
+ * We want to avoid attempting to free too much memory too hard, so estimate the
+ * minimum acceptable size of a hibernation image to use as the lower limit for
+ * preallocating memory.
+ *
+ * We assume that the minimum image size should be proportional to
+ *
+ * [number of saveable pages] - [number of pages that can be freed in theory]
+ *
+ * where the second term is the sum of (1) reclaimable slab pages, (2) active
+ * and (3) inactive anonymouns pages, (4) active and (5) inactive file pages,
+ * minus mapped file pages.
+ */
+static unsigned long minimum_image_size(unsigned long saveable)
+{
+ unsigned long size;
+
+ size = global_page_state(NR_SLAB_RECLAIMABLE)
+ + global_page_state(NR_ACTIVE_ANON)
+ + global_page_state(NR_INACTIVE_ANON)
+ + global_page_state(NR_ACTIVE_FILE)
+ + global_page_state(NR_INACTIVE_FILE)
+ - global_page_state(NR_FILE_MAPPED);
+
+ return saveable <= size ? 0 : saveable - size;
+}
+
+/**
+ * hibernate_preallocate_memory - Preallocate memory for hibernation image
+ *
+ * To create a hibernation image it is necessary to make a copy of every page
+ * frame in use. We also need a number of page frames to be free during
+ * hibernation for allocations made while saving the image and for device
+ * drivers, in case they need to allocate memory from their hibernation
+ * callbacks (these two numbers are given by PAGES_FOR_IO and SPARE_PAGES,
+ * respectively, both of which are rough estimates). To make this happen, we
+ * compute the total number of available page frames and allocate at least
+ *
+ * ([page frames total] + PAGES_FOR_IO + [metadata pages]) / 2 + 2 * SPARE_PAGES
+ *
+ * of them, which corresponds to the maximum size of a hibernation image.
+ *
+ * If image_size is set below the number following from the above formula,
+ * the preallocation of memory is continued until the total number of saveable
+ * pages in the system is below the requested image size or the minimum
+ * acceptable image size returned by minimum_image_size(), whichever is greater.
+ */
+int hibernate_preallocate_memory(void)
{
- long tmp;
struct zone *zone;
- unsigned long pages = 0;
- unsigned int i = 0;
- char *p = "-\\|/";
+ unsigned long saveable, size, max_size, count, highmem, pages = 0;
+ unsigned long alloc, save_highmem, pages_highmem;
struct timeval start, stop;
+ int error;
- printk(KERN_INFO "PM: Shrinking memory... ");
+ printk(KERN_INFO "PM: Preallocating image memory... ");
do_gettimeofday(&start);
- do {
- long size, highmem_size;
-
- highmem_size = count_highmem_pages();
- size = count_data_pages() + PAGES_FOR_IO + SPARE_PAGES;
- tmp = size;
- size += highmem_size;
- for_each_populated_zone(zone) {
- tmp += snapshot_additional_pages(zone);
- if (is_highmem(zone)) {
- highmem_size -=
- zone_page_state(zone, NR_FREE_PAGES);
- } else {
- tmp -= zone_page_state(zone, NR_FREE_PAGES);
- tmp += zone->lowmem_reserve[ZONE_NORMAL];
- }
- }
- if (highmem_size < 0)
- highmem_size = 0;
+ error = memory_bm_create(&orig_bm, GFP_IMAGE, PG_ANY);
+ if (error)
+ goto err_out;
- tmp += highmem_size;
- if (tmp > 0) {
- tmp = __shrink_memory(tmp);
- if (!tmp)
- return -ENOMEM;
- pages += tmp;
- } else if (size > image_size / PAGE_SIZE) {
- tmp = __shrink_memory(size - (image_size / PAGE_SIZE));
- pages += tmp;
- }
- printk("\b%c", p[i++%4]);
- } while (tmp > 0);
+ error = memory_bm_create(©_bm, GFP_IMAGE, PG_ANY);
+ if (error)
+ goto err_out;
+
+ alloc_normal = 0;
+ alloc_highmem = 0;
+
+ /* Count the number of saveable data pages. */
+ save_highmem = count_highmem_pages();
+ saveable = count_data_pages();
+
+ /*
+ * Compute the total number of page frames we can use (count) and the
+ * number of pages needed for image metadata (size).
+ */
+ count = saveable;
+ saveable += save_highmem;
+ highmem = save_highmem;
+ size = 0;
+ for_each_populated_zone(zone) {
+ size += snapshot_additional_pages(zone);
+ if (is_highmem(zone))
+ highmem += zone_page_state(zone, NR_FREE_PAGES);
+ else
+ count += zone_page_state(zone, NR_FREE_PAGES);
+ }
+ count += highmem;
+ count -= totalreserve_pages;
+
+ /* Compute the maximum number of saveable pages to leave in memory. */
+ max_size = (count - (size + PAGES_FOR_IO)) / 2 - 2 * SPARE_PAGES;
+ size = DIV_ROUND_UP(image_size, PAGE_SIZE);
+ if (size > max_size)
+ size = max_size;
+ /*
+ * If the maximum is not less than the current number of saveable pages
+ * in memory, allocate page frames for the image and we're done.
+ */
+ if (size >= saveable) {
+ pages = preallocate_image_highmem(save_highmem);
+ pages += preallocate_image_memory(saveable - pages);
+ goto out;
+ }
+
+ /* Estimate the minimum size of the image. */
+ pages = minimum_image_size(saveable);
+ if (size < pages)
+ size = min_t(unsigned long, pages, max_size);
+
+ /*
+ * Let the memory management subsystem know that we're going to need a
+ * large number of page frames to allocate and make it free some memory.
+ * NOTE: If this is not done, performance will be hurt badly in some
+ * test cases.
+ */
+ shrink_all_memory(saveable - size);
+
+ /*
+ * The number of saveable pages in memory was too high, so apply some
+ * pressure to decrease it. First, make room for the largest possible
+ * image and fail if that doesn't work. Next, try to decrease the size
+ * of the image as much as indicated by 'size' using allocations from
+ * highmem and non-highmem zones separately.
+ */
+ pages_highmem = preallocate_image_highmem(highmem / 2);
+ alloc = (count - max_size) - pages_highmem;
+ pages = preallocate_image_memory(alloc);
+ if (pages < alloc)
+ goto err_out;
+ size = max_size - size;
+ alloc = size;
+ size = preallocate_highmem_fraction(size, highmem, count);
+ pages_highmem += size;
+ alloc -= size;
+ pages += preallocate_image_memory(alloc);
+ pages += pages_highmem;
+
+ /*
+ * We only need as many page frames for the image as there are saveable
+ * pages in memory, but we have allocated more. Release the excessive
+ * ones now.
+ */
+ free_unnecessary_pages();
+
+ out:
do_gettimeofday(&stop);
- printk("\bdone (%lu pages freed)\n", pages);
- swsusp_show_speed(&start, &stop, pages, "Freed");
+ printk(KERN_CONT "done (allocated %lu pages)\n", pages);
+ swsusp_show_speed(&start, &stop, pages, "Allocated");
return 0;
+
+ err_out:
+ printk(KERN_CONT "\n");
+ swsusp_free();
+ return -ENOMEM;
}
#ifdef CONFIG_HIGHMEM
static unsigned int count_pages_for_highmem(unsigned int nr_highmem)
{
- unsigned int free_highmem = count_free_highmem_pages();
+ unsigned int free_highmem = count_free_highmem_pages() + alloc_highmem;
if (free_highmem >= nr_highmem)
nr_highmem = 0;
static int enough_free_mem(unsigned int nr_pages, unsigned int nr_highmem)
{
struct zone *zone;
- unsigned int free = 0, meta = 0;
+ unsigned int free = alloc_normal;
- for_each_zone(zone) {
- meta += snapshot_additional_pages(zone);
+ for_each_populated_zone(zone)
if (!is_highmem(zone))
free += zone_page_state(zone, NR_FREE_PAGES);
- }
nr_pages += count_pages_for_highmem(nr_highmem);
- pr_debug("PM: Normal pages needed: %u + %u + %u, available pages: %u\n",
- nr_pages, PAGES_FOR_IO, meta, free);
+ pr_debug("PM: Normal pages needed: %u + %u, available pages: %u\n",
+ nr_pages, PAGES_FOR_IO, free);
- return free > nr_pages + PAGES_FOR_IO + meta;
+ return free > nr_pages + PAGES_FOR_IO;
}
#ifdef CONFIG_HIGHMEM
*/
static inline unsigned int
-alloc_highmem_image_pages(struct memory_bitmap *bm, unsigned int nr_highmem)
+alloc_highmem_pages(struct memory_bitmap *bm, unsigned int nr_highmem)
{
unsigned int to_alloc = count_free_highmem_pages();
static inline int get_highmem_buffer(int safe_needed) { return 0; }
static inline unsigned int
-alloc_highmem_image_pages(struct memory_bitmap *bm, unsigned int n) { return 0; }
+alloc_highmem_pages(struct memory_bitmap *bm, unsigned int n) { return 0; }
#endif /* CONFIG_HIGHMEM */
/**
swsusp_alloc(struct memory_bitmap *orig_bm, struct memory_bitmap *copy_bm,
unsigned int nr_pages, unsigned int nr_highmem)
{
- int error;
-
- error = memory_bm_create(orig_bm, GFP_ATOMIC | __GFP_COLD, PG_ANY);
- if (error)
- goto Free;
-
- error = memory_bm_create(copy_bm, GFP_ATOMIC | __GFP_COLD, PG_ANY);
- if (error)
- goto Free;
+ int error = 0;
if (nr_highmem > 0) {
error = get_highmem_buffer(PG_ANY);
if (error)
- goto Free;
-
- nr_pages += alloc_highmem_image_pages(copy_bm, nr_highmem);
+ goto err_out;
+ if (nr_highmem > alloc_highmem) {
+ nr_highmem -= alloc_highmem;
+ nr_pages += alloc_highmem_pages(copy_bm, nr_highmem);
+ }
}
- while (nr_pages-- > 0) {
- struct page *page = alloc_image_page(GFP_ATOMIC | __GFP_COLD);
-
- if (!page)
- goto Free;
+ if (nr_pages > alloc_normal) {
+ nr_pages -= alloc_normal;
+ while (nr_pages-- > 0) {
+ struct page *page;
- memory_bm_set_bit(copy_bm, page_to_pfn(page));
+ page = alloc_image_page(GFP_ATOMIC | __GFP_COLD);
+ if (!page)
+ goto err_out;
+ memory_bm_set_bit(copy_bm, page_to_pfn(page));
+ }
}
+
return 0;
- Free:
+ err_out:
swsusp_free();
- return -ENOMEM;
+ return error;
}
-/* Memory bitmap used for marking saveable pages (during suspend) or the
- * suspend image pages (during resume)
- */
-static struct memory_bitmap orig_bm;
-/* Memory bitmap used on suspend for marking allocated pages that will contain
- * the copies of saveable pages. During resume it is initially used for
- * marking the suspend image pages, but then its set bits are duplicated in
- * @orig_bm and it is released. Next, on systems with high memory, it may be
- * used for marking "safe" highmem pages, but it has to be reinitialized for
- * this purpose.
- */
-static struct memory_bitmap copy_bm;
-
asmlinkage int swsusp_save(void)
{
unsigned int nr_pages, nr_highmem;
unsigned long pfn, max_zone_pfn;
/* Clear page flags */
- for_each_zone(zone) {
+ for_each_populated_zone(zone) {
max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages;
for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++)
if (pfn_valid(pfn))
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff