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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6

Browse Source 
* '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)
This commit is contained in:
Linus Torvalds 2009-09-14 20:03:54 -07:00
commit f86054c245
32 changed files with 2288 additions and 306 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

378
Documentation/power/runtime_pm.txt Normal file
View File

@ -0,0 +1,378 @@
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.

3
arch/arm/include/asm/device.h
View File

@ -12,4 +12,7 @@ struct dev_archdata {
#endif
};
struct pdev_archdata {
};
#endif

11
arch/arm/plat-omap/debug-leds.c
View File

@ -281,24 +281,27 @@ static int /* __init */ fpga_probe(struct platform_device *pdev)
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)

14
arch/arm/plat-omap/gpio.c
View File

@ -1418,8 +1418,9 @@ static struct irq_chip mpuio_irq_chip = {
#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;
@ -1432,8 +1433,9 @@ static int omap_mpuio_suspend_late(struct platform_device *pdev, pm_message_t me
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;
@ -1445,14 +1447,18 @@ static int omap_mpuio_resume_early(struct platform_device *pdev)
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,
},
};

3
arch/ia64/include/asm/device.h
View File

@ -15,4 +15,7 @@ struct dev_archdata {
#endif
};
struct pdev_archdata {
};
#endif /* _ASM_IA64_DEVICE_H */

3
arch/microblaze/include/asm/device.h
View File

@ -16,6 +16,9 @@ struct dev_archdata {
struct device_node *of_node;
};
struct pdev_archdata {
};
#endif /* _ASM_MICROBLAZE_DEVICE_H */

3
arch/powerpc/include/asm/device.h
View File

@ -30,4 +30,7 @@ dev_archdata_get_node(const struct dev_archdata *ad)
return ad->of_node;
}
struct pdev_archdata {
};
#endif /* _ASM_POWERPC_DEVICE_H */

3
arch/sparc/include/asm/device.h
View File

@ -32,4 +32,7 @@ dev_archdata_get_node(const struct dev_archdata *ad)
return ad->prom_node;
}
struct pdev_archdata {
};
#endif /* _ASM_SPARC_DEVICE_H */

3
arch/x86/include/asm/device.h
View File

@ -13,4 +13,7 @@ struct dma_map_ops *dma_ops;
#endif
};
struct pdev_archdata {
};
#endif /* _ASM_X86_DEVICE_H */

11
drivers/base/dd.c
View File

@ -23,6 +23,7 @@
#include <linux/kthread.h>
#include <linux/wait.h>
#include <linux/async.h>
#include <linux/pm_runtime.h>
#include "base.h"
#include "power/power.h"
@ -202,7 +203,10 @@ int driver_probe_device(struct device_driver *drv, struct device *dev)
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;
}
@ -245,7 +249,9 @@ int device_attach(struct device *dev)
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;
@ -306,6 +312,9 @@ static void __device_release_driver(struct device *dev)
drv = dev->driver;
if (drv) {
pm_runtime_get_noresume(dev);
pm_runtime_barrier(dev);
driver_sysfs_remove(dev);
if (dev->bus)
@ -324,6 +333,8 @@ static void __device_release_driver(struct device *dev)
blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
BUS_NOTIFY_UNBOUND_DRIVER,
dev);
pm_runtime_put_sync(dev);
}
}

82
drivers/base/platform.c
View File

@ -17,6 +17,7 @@
#include <linux/bootmem.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include "base.h"
@ -625,30 +626,6 @@ static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
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);
@ -680,6 +657,13 @@ static void platform_pm_complete(struct device *dev)
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)
@ -711,8 +695,6 @@ static int platform_pm_suspend_noirq(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;
@ -747,8 +729,6 @@ static int platform_pm_resume_noirq(struct device *dev)
if (drv->pm) {
if (drv->pm->resume_noirq)
ret = drv->pm->resume_noirq(dev);
} else {
ret = platform_legacy_resume_early(dev);
}
return ret;
@ -794,8 +774,6 @@ static int platform_pm_freeze_noirq(struct device *dev)
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;
@ -830,8 +808,6 @@ static int platform_pm_thaw_noirq(struct device *dev)
if (drv->pm) {
if (drv->pm->thaw_noirq)
ret = drv->pm->thaw_noirq(dev);
} else {
ret = platform_legacy_resume_early(dev);
}
return ret;
@ -866,8 +842,6 @@ static int platform_pm_poweroff_noirq(struct device *dev)
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;
@ -902,8 +876,6 @@ static int platform_pm_restore_noirq(struct device *dev)
if (drv->pm) {
if (drv->pm->restore_noirq)
ret = drv->pm->restore_noirq(dev);
} else {
ret = platform_legacy_resume_early(dev);
}
return ret;
@ -922,6 +894,31 @@ static int platform_pm_restore_noirq(struct device *dev)
#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,
@ -937,22 +934,17 @@ static const struct dev_pm_ops platform_dev_pm_ops = {
.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);

1
drivers/base/power/Makefile
View File

@ -1,5 +1,6 @@
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

191
drivers/base/power/main.c
View File

@ -21,6 +21,7 @@
#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>
@ -49,7 +50,17 @@ static DEFINE_MUTEX(dpm_list_mtx);
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)
{
@ -57,7 +68,7 @@ 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)
{
@ -65,8 +76,8 @@ 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)
{
@ -92,10 +103,8 @@ 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)
{
@ -105,12 +114,13 @@ 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)
{
@ -124,9 +134,9 @@ 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)
{
@ -140,8 +150,8 @@ 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)
{
@ -152,10 +162,10 @@ 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,
@ -213,13 +223,13 @@ static int pm_op(struct device *dev,
}
/**
* 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,
@ -317,11 +327,12 @@ static void pm_dev_err(struct device *dev, pm_message_t state, char *info,
/*------------------------- 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)
{
@ -343,20 +354,18 @@ 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.
* dpm_resume_noirq - Execute "early resume" callbacks for 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.
*
* 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;
@ -372,9 +381,9 @@ void dpm_resume_noirq(pm_message_t state)
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)
{
@ -423,11 +432,11 @@ 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)
{
@ -435,7 +444,6 @@ 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);
@ -464,9 +472,9 @@ static void dpm_resume(pm_message_t state)
}
/**
* 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)
{
@ -491,11 +499,11 @@ 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)
{
@ -512,6 +520,7 @@ 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);
}
@ -524,11 +533,11 @@ static void dpm_complete(pm_message_t state)
}
/**
* 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)
{
@ -542,9 +551,11 @@ EXPORT_SYMBOL_GPL(dpm_resume_end);
/*------------------------- 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)
{
@ -561,11 +572,12 @@ 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)
{
@ -582,13 +594,11 @@ 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.
* dpm_suspend_noirq - Execute "late suspend" callbacks for non-sysdev devices.
* @state: PM transition of the system being carried out.
*
* Prevent device drivers from receiving interrupts and call the "noirq"
* suspend handlers.
*
* 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)
{
@ -613,9 +623,9 @@ 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)
{
@ -662,10 +672,8 @@ 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)
{
@ -699,9 +707,12 @@ 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)
{
@ -737,10 +748,10 @@ 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)
{
@ -757,7 +768,14 @@ 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) {
@ -784,10 +802,11 @@ static int dpm_prepare(pm_message_t state)
}
/**
* 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)
{

31
drivers/base/power/power.h
View File

@ -1,7 +1,14 @@
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
@ -16,23 +23,33 @@ static inline struct device *to_device(struct list_head *entry)
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

1011
drivers/base/power/runtime.c Normal file
View File

File diff suppressed because it is too large Load Diff

9
drivers/block/floppy.c
View File

@ -4151,7 +4151,7 @@ static void floppy_device_release(struct device *dev)
{
}
static int floppy_resume(struct platform_device *dev)
static int floppy_resume(struct device *dev)
{
int fdc;
@ -4162,10 +4162,15 @@ static int floppy_resume(struct platform_device *dev)
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,
},
};

19
drivers/dma/at_hdmac.c
View File

@ -1166,32 +1166,37 @@ static void at_dma_shutdown(struct platform_device *pdev)
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,
},
};

15
drivers/dma/dw_dmac.c
View File

@ -1399,8 +1399,9 @@ static void dw_shutdown(struct platform_device *pdev)
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));
@ -1408,23 +1409,27 @@ static int dw_suspend_late(struct platform_device *pdev, pm_message_t mesg)
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,
},
};

15
drivers/dma/txx9dmac.c
View File

@ -1291,17 +1291,18 @@ static void txx9dmac_shutdown(struct platform_device *pdev)
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;
@ -1314,6 +1315,11 @@ static int txx9dmac_resume_early(struct platform_device *pdev)
}
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 = {
@ -1324,10 +1330,9 @@ static struct platform_driver txx9dmac_chan_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,
},
};

25
drivers/i2c/busses/i2c-pxa.c
View File

@ -1134,35 +1134,44 @@ static int __exit i2c_pxa_remove(struct platform_device *dev)
}
#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,
};

25
drivers/i2c/busses/i2c-s3c2410.c
View File

@ -946,17 +946,20 @@ static int s3c24xx_i2c_remove(struct platform_device *pdev)
}
#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);
@ -964,9 +967,14 @@ static int s3c24xx_i2c_resume(struct platform_device *dev)
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 */
@ -985,12 +993,11 @@ MODULE_DEVICE_TABLE(platform, s3c24xx_driver_ids);
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,
},
};

15
drivers/platform/x86/hp-wmi.c
View File

@ -53,7 +53,7 @@ MODULE_ALIAS("wmi:5FB7F034-2C63-45e9-BE91-3D44E2C707E4");
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;
@ -94,14 +94,19 @@ static struct rfkill *wifi_rfkill;
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)
@ -512,7 +517,7 @@ static int __exit hp_wmi_bios_remove(struct platform_device *device)
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

18
drivers/usb/musb/musb_core.c
View File

@ -2167,8 +2167,9 @@ static int __devexit musb_remove(struct platform_device *pdev)
#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);
@ -2195,8 +2196,9 @@ static int musb_suspend(struct platform_device *pdev, pm_message_t message)
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)
@ -2214,9 +2216,14 @@ static int musb_resume_early(struct platform_device *pdev)
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 = {
@ -2224,11 +2231,10 @@ 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,
};
/*-------------------------------------------------------------------------*/

3
include/asm-generic/device.h
View File

@ -9,4 +9,7 @@
struct dev_archdata {
};
struct pdev_archdata {
};
#endif /* _ASM_GENERIC_DEVICE_H */

5
include/linux/platform_device.h
View File

@ -22,6 +22,9 @@ struct platform_device {
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)
@ -57,8 +60,6 @@ struct platform_driver {
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;

115
include/linux/pm.h
View File

@ -22,6 +22,10 @@
#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.
@ -165,6 +169,28 @@ typedef struct pm_message {
* 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 {
@ -182,8 +208,25 @@ 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
*
@ -315,14 +358,80 @@ enum dpm_state {
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
};
/*

114
include/linux/pm_runtime.h Normal file
View File

@ -0,0 +1,114 @@
/*
* 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

14
kernel/power/Kconfig
View File

@ -208,3 +208,17 @@ config APM_EMULATION
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.

21
kernel/power/hibernate.c
View File

@ -298,8 +298,8 @@ int hibernation_snapshot(int platform_mode)
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;
@ -315,6 +315,10 @@ int hibernation_snapshot(int platform_mode)
/* 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();
@ -460,11 +464,11 @@ int hibernation_platform_enter(void)
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);
@ -476,7 +480,7 @@ int hibernation_platform_enter(void)
* 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);
@ -578,7 +582,10 @@ int hibernate(void)
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)
@ -590,8 +597,8 @@ int hibernate(void)
power_down();
} else {
pr_debug("PM: Image restored successfully.\n");
swsusp_free();
}
Thaw:
thaw_processes();
Finish:

17
kernel/power/main.c
View File

@ -11,6 +11,7 @@
#include <linux/kobject.h>
#include <linux/string.h>
#include <linux/resume-trace.h>
#include <linux/workqueue.h>
#include "power.h"
@ -217,8 +218,24 @@ static struct attribute_group attr_group = {
.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;

2
kernel/power/power.h
View File

@ -74,7 +74,7 @@ extern asmlinkage int swsusp_arch_resume(void);
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

414
kernel/power/snapshot.c
View File

@ -233,7 +233,7 @@ static void *chain_alloc(struct chain_allocator *ca, unsigned int size)
#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 */
@ -275,7 +275,7 @@ static void memory_bm_free(struct memory_bitmap *bm, int clear_nosave_free);
/**
* 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
*/
@ -853,7 +853,7 @@ static unsigned int count_highmem_pages(void)
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))
@ -916,7 +916,7 @@ static unsigned int count_data_pages(void)
unsigned long pfn, max_zone_pfn;
unsigned int n = 0;
for_each_zone(zone) {
for_each_populated_zone(zone) {
if (is_highmem(zone))
continue;
@ -1010,7 +1010,7 @@ copy_data_pages(struct memory_bitmap *copy_bm, struct memory_bitmap *orig_bm)
struct zone *zone;
unsigned long pfn;
for_each_zone(zone) {
for_each_populated_zone(zone) {
unsigned long max_zone_pfn;
mark_free_pages(zone);
@ -1033,6 +1033,25 @@ copy_data_pages(struct memory_bitmap *copy_bm, struct memory_bitmap *orig_bm)
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.
@ -1046,7 +1065,7 @@ void swsusp_free(void)
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)) {
@ -1064,74 +1083,286 @@ void swsusp_free(void)
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)
/**
* 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.
*
* 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(&copy_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);
}
/**
* swsusp_shrink_memory - Try to free as much memory as needed
*
* ... but do not OOM-kill anyone
*
* Notice: all userland should be stopped before it is called, or
* livelock is possible.
* __fraction - Compute (an approximation of) x * (multiplier / base)
*/
#define SHRINK_BITE 10000
static inline unsigned long __shrink_memory(long tmp)
static unsigned long __fraction(u64 x, u64 multiplier, u64 base)
{
if (tmp > SHRINK_BITE)
tmp = SHRINK_BITE;
return shrink_all_memory(tmp);
x *= multiplier;
do_div(x, base);
return (unsigned long)x;
}
int swsusp_shrink_memory(void)
static unsigned long preallocate_highmem_fraction(unsigned long nr_pages,
unsigned long highmem,
unsigned long total)
{
unsigned long alloc = __fraction(nr_pages, highmem, total);
return preallocate_image_pages(alloc, GFP_IMAGE | __GFP_HIGHMEM);
}
#else /* CONFIG_HIGHMEM */
static inline unsigned long preallocate_image_highmem(unsigned long nr_pages)
{
return 0;
}
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(&copy_bm);
while (to_free_normal > 0 && to_free_highmem > 0) {
unsigned long pfn = memory_bm_next_pfn(&copy_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(&copy_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];
}
}
error = memory_bm_create(&orig_bm, GFP_IMAGE, PG_ANY);
if (error)
goto err_out;
if (highmem_size < 0)
highmem_size = 0;
error = memory_bm_create(&copy_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);
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
@ -1142,7 +1373,7 @@ int swsusp_shrink_memory(void)
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;
@ -1164,19 +1395,17 @@ count_pages_for_highmem(unsigned int nr_highmem) { return 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
@ -1198,7 +1427,7 @@ static inline int get_highmem_buffer(int safe_needed)
*/
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();
@ -1218,7 +1447,7 @@ alloc_highmem_image_pages(struct memory_bitmap *bm, unsigned int nr_highmem)
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 */
/**
@ -1237,51 +1466,36 @@ static int
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 (nr_pages > alloc_normal) {
nr_pages -= alloc_normal;
while (nr_pages-- > 0) {
struct page *page;
if (!page)
goto Free;
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;
@ -1474,7 +1688,7 @@ static int mark_unsafe_pages(struct memory_bitmap *bm)
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))