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Merge branches 'pm-qos', 'pm-domains' and 'pm-drivers'

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* pm-qos:
  PM / QoS: Add type to dev_pm_qos_add_ancestor_request() arguments
  ACPI / LPSS: Support for device latency tolerance PM QoS
  ACPI / scan: Add bind/unbind callbacks to struct acpi_scan_handler
  PM / QoS: Introcuce latency tolerance device PM QoS type
  PM / QoS: Add no_constraints_value field to struct pm_qos_constraints
  PM / QoS: Rename device resume latency QoS items

* pm-domains:
  PM / domains: Turn latency warning into debug message

* pm-drivers:
  PM: Add pm_runtime_suspend|resume_force functions
  PM / runtime: Fetch runtime PM callbacks using a macro
This commit is contained in:
Rafael J. Wysocki 2014-03-20 13:25:36 +01:00
commit 165f5fd04a
20 changed files with 590 additions and 167 deletions
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27
Documentation/ABI/testing/sysfs-devices-power
View file

@ -187,7 +187,7 @@ Description:
Not all drivers support this attribute. If it isn't supported,
attempts to read or write it will yield I/O errors.
What: /sys/devices/.../power/pm_qos_latency_us
What: /sys/devices/.../power/pm_qos_resume_latency_us
Date: March 2012
Contact: Rafael J. Wysocki <rjw@rjwysocki.net>
Description:
@ -205,6 +205,31 @@ Description:
This attribute has no effect on system-wide suspend/resume and
hibernation.
What: /sys/devices/.../power/pm_qos_latency_tolerance_us
Date: January 2014
Contact: Rafael J. Wysocki <rjw@rjwysocki.net>
Description:
The /sys/devices/.../power/pm_qos_latency_tolerance_us attribute
contains the PM QoS active state latency tolerance limit for the
given device in microseconds. That is the maximum memory access
latency the device can suffer without any visible adverse
effects on user space functionality. If that value is the
string "any", the latency does not matter to user space at all,
but hardware should not be allowed to set the latency tolerance
for the device automatically.
Reading "auto" from this file means that the maximum memory
access latency for the device may be determined automatically
by the hardware as needed. Writing "auto" to it allows the
hardware to be switched to this mode if there are no other
latency tolerance requirements from the kernel side.
This attribute is only present if the feature controlled by it
is supported by the hardware.
This attribute has no effect on runtime suspend and resume of
devices and on system-wide suspend/resume and hibernation.
What: /sys/devices/.../power/pm_qos_no_power_off
Date: September 2012
Contact: Rafael J. Wysocki <rjw@rjwysocki.net>

80
Documentation/power/pm_qos_interface.txt
View file

@ -88,17 +88,19 @@ node.
2. PM QoS per-device latency and flags framework
For each device, there are two lists of PM QoS requests. One is maintained
along with the aggregated target of latency value and the other is for PM QoS
flags. Values are updated in response to changes of the request list.
For each device, there are three lists of PM QoS requests. Two of them are
maintained along with the aggregated targets of resume latency and active
state latency tolerance (in microseconds) and the third one is for PM QoS flags.
Values are updated in response to changes of the request list.
Target latency value is simply the minimum of the request values held in the
parameter list elements. The PM QoS flags aggregate value is a gather (bitwise
OR) of all list elements' values. Two device PM QoS flags are defined currently:
PM_QOS_FLAG_NO_POWER_OFF and PM_QOS_FLAG_REMOTE_WAKEUP.
The target values of resume latency and active state latency tolerance are
simply the minimum of the request values held in the parameter list elements.
The PM QoS flags aggregate value is a gather (bitwise OR) of all list elements'
values. Two device PM QoS flags are defined currently: PM_QOS_FLAG_NO_POWER_OFF
and PM_QOS_FLAG_REMOTE_WAKEUP.
Note: the aggregated target value is implemented as an atomic variable so that
reading the aggregated value does not require any locking mechanism.
Note: The aggregated target values are implemented in such a way that reading
the aggregated value does not require any locking mechanism.
From kernel mode the use of this interface is the following:
@ -132,19 +134,21 @@ The meaning of the return values is as follows:
PM_QOS_FLAGS_UNDEFINED: The device's PM QoS structure has not been
initialized or the list of requests is empty.
int dev_pm_qos_add_ancestor_request(dev, handle, value)
int dev_pm_qos_add_ancestor_request(dev, handle, type, value)
Add a PM QoS request for the first direct ancestor of the given device whose
power.ignore_children flag is unset.
power.ignore_children flag is unset (for DEV_PM_QOS_RESUME_LATENCY requests)
or whose power.set_latency_tolerance callback pointer is not NULL (for
DEV_PM_QOS_LATENCY_TOLERANCE requests).
int dev_pm_qos_expose_latency_limit(device, value)
Add a request to the device's PM QoS list of latency constraints and create
a sysfs attribute pm_qos_resume_latency_us under the device's power directory
allowing user space to manipulate that request.
Add a request to the device's PM QoS list of resume latency constraints and
create a sysfs attribute pm_qos_resume_latency_us under the device's power
directory allowing user space to manipulate that request.
void dev_pm_qos_hide_latency_limit(device)
Drop the request added by dev_pm_qos_expose_latency_limit() from the device's
PM QoS list of latency constraints and remove sysfs attribute pm_qos_resume_latency_us
from the device's power directory.
PM QoS list of resume latency constraints and remove sysfs attribute
pm_qos_resume_latency_us from the device's power directory.
int dev_pm_qos_expose_flags(device, value)
Add a request to the device's PM QoS list of flags and create sysfs attributes
@ -163,7 +167,7 @@ a per-device notification tree and a global notification tree.
int dev_pm_qos_add_notifier(device, notifier):
Adds a notification callback function for the device.
The callback is called when the aggregated value of the device constraints list
is changed.
is changed (for resume latency device PM QoS only).
int dev_pm_qos_remove_notifier(device, notifier):
Removes the notification callback function for the device.
@ -171,14 +175,48 @@ Removes the notification callback function for the device.
int dev_pm_qos_add_global_notifier(notifier):
Adds a notification callback function in the global notification tree of the
framework.
The callback is called when the aggregated value for any device is changed.
The callback is called when the aggregated value for any device is changed
(for resume latency device PM QoS only).
int dev_pm_qos_remove_global_notifier(notifier):
Removes the notification callback function from the global notification tree
of the framework.
From user mode:
No API for user space access to the per-device latency constraints is provided
yet - still under discussion.
Active state latency tolerance
This device PM QoS type is used to support systems in which hardware may switch
to energy-saving operation modes on the fly. In those systems, if the operation
mode chosen by the hardware attempts to save energy in an overly aggressive way,
it may cause excess latencies to be visible to software, causing it to miss
certain protocol requirements or target frame or sample rates etc.
If there is a latency tolerance control mechanism for a given device available
to software, the .set_latency_tolerance callback in that device's dev_pm_info
structure should be populated. The routine pointed to by it is should implement
whatever is necessary to transfer the effective requirement value to the
hardware.
Whenever the effective latency tolerance changes for the device, its
.set_latency_tolerance() callback will be executed and the effective value will
be passed to it. If that value is negative, which means that the list of
latency tolerance requirements for the device is empty, the callback is expected
to switch the underlying hardware latency tolerance control mechanism to an
autonomous mode if available. If that value is PM_QOS_LATENCY_ANY, in turn, and
the hardware supports a special "no requirement" setting, the callback is
expected to use it. That allows software to prevent the hardware from
automatically updating the device's latency tolerance in response to its power
state changes (e.g. during transitions from D3cold to D0), which generally may
be done in the autonomous latency tolerance control mode.
If .set_latency_tolerance() is present for the device, sysfs attribute
pm_qos_latency_tolerance_us will be present in the devivce's power directory.
Then, user space can use that attribute to specify its latency tolerance
requirement for the device, if any. Writing "any" to it means "no requirement,
but do not let the hardware control latency tolerance" and writing "auto" to it
allows the hardware to be switched to the autonomous mode if there are no other
requirements from the kernel side in the device's list.
Kernel code can use the functions described above along with the
DEV_PM_QOS_LATENCY_TOLERANCE device PM QoS type to add, remove and update
latency tolerance requirements for devices.

2
Documentation/trace/events-power.txt
View file

@ -92,5 +92,5 @@ dev_pm_qos_remove_request "device=%s type=%s new_value=%d"
The first parameter gives the device name which tries to add/update/remove
QoS requests.
The second parameter gives the request type (e.g. "DEV_PM_QOS_LATENCY").
The second parameter gives the request type (e.g. "DEV_PM_QOS_RESUME_LATENCY").
The third parameter is value to be added/updated/removed.

71
drivers/acpi/acpi_lpss.c
View file

@ -33,6 +33,13 @@ ACPI_MODULE_NAME("acpi_lpss");
#define LPSS_GENERAL_UART_RTS_OVRD BIT(3)
#define LPSS_SW_LTR 0x10
#define LPSS_AUTO_LTR 0x14
#define LPSS_LTR_SNOOP_REQ BIT(15)
#define LPSS_LTR_SNOOP_MASK 0x0000FFFF
#define LPSS_LTR_SNOOP_LAT_1US 0x800
#define LPSS_LTR_SNOOP_LAT_32US 0xC00
#define LPSS_LTR_SNOOP_LAT_SHIFT 5
#define LPSS_LTR_SNOOP_LAT_CUTOFF 3000
#define LPSS_LTR_MAX_VAL 0x3FF
#define LPSS_TX_INT 0x20
#define LPSS_TX_INT_MASK BIT(1)
@ -326,6 +333,17 @@ static int acpi_lpss_create_device(struct acpi_device *adev,
return ret;
}
static u32 __lpss_reg_read(struct lpss_private_data *pdata, unsigned int reg)
{
return readl(pdata->mmio_base + pdata->dev_desc->prv_offset + reg);
}
static void __lpss_reg_write(u32 val, struct lpss_private_data *pdata,
unsigned int reg)
{
writel(val, pdata->mmio_base + pdata->dev_desc->prv_offset + reg);
}
static int lpss_reg_read(struct device *dev, unsigned int reg, u32 *val)
{
struct acpi_device *adev;
@ -347,7 +365,7 @@ static int lpss_reg_read(struct device *dev, unsigned int reg, u32 *val)
ret = -ENODEV;
goto out;
}
*val = readl(pdata->mmio_base + pdata->dev_desc->prv_offset + reg);
*val = __lpss_reg_read(pdata, reg);
out:
spin_unlock_irqrestore(&dev->power.lock, flags);
@ -400,6 +418,37 @@ static struct attribute_group lpss_attr_group = {
.name = "lpss_ltr",
};
static void acpi_lpss_set_ltr(struct device *dev, s32 val)
{
struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
u32 ltr_mode, ltr_val;
ltr_mode = __lpss_reg_read(pdata, LPSS_GENERAL);
if (val < 0) {
if (ltr_mode & LPSS_GENERAL_LTR_MODE_SW) {
ltr_mode &= ~LPSS_GENERAL_LTR_MODE_SW;
__lpss_reg_write(ltr_mode, pdata, LPSS_GENERAL);
}
return;
}
ltr_val = __lpss_reg_read(pdata, LPSS_SW_LTR) & ~LPSS_LTR_SNOOP_MASK;
if (val >= LPSS_LTR_SNOOP_LAT_CUTOFF) {
ltr_val |= LPSS_LTR_SNOOP_LAT_32US;
val = LPSS_LTR_MAX_VAL;
} else if (val > LPSS_LTR_MAX_VAL) {
ltr_val |= LPSS_LTR_SNOOP_LAT_32US | LPSS_LTR_SNOOP_REQ;
val >>= LPSS_LTR_SNOOP_LAT_SHIFT;
} else {
ltr_val |= LPSS_LTR_SNOOP_LAT_1US | LPSS_LTR_SNOOP_REQ;
}
ltr_val |= val;
__lpss_reg_write(ltr_val, pdata, LPSS_SW_LTR);
if (!(ltr_mode & LPSS_GENERAL_LTR_MODE_SW)) {
ltr_mode |= LPSS_GENERAL_LTR_MODE_SW;
__lpss_reg_write(ltr_mode, pdata, LPSS_GENERAL);
}
}
static int acpi_lpss_platform_notify(struct notifier_block *nb,
unsigned long action, void *data)
{
@ -437,9 +486,29 @@ static struct notifier_block acpi_lpss_nb = {
.notifier_call = acpi_lpss_platform_notify,
};
static void acpi_lpss_bind(struct device *dev)
{
struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
if (!pdata || !pdata->mmio_base || !pdata->dev_desc->ltr_required)
return;
if (pdata->mmio_size >= pdata->dev_desc->prv_offset + LPSS_LTR_SIZE)
dev->power.set_latency_tolerance = acpi_lpss_set_ltr;
else
dev_err(dev, "MMIO size insufficient to access LTR\n");
}
static void acpi_lpss_unbind(struct device *dev)
{
dev->power.set_latency_tolerance = NULL;
}
static struct acpi_scan_handler lpss_handler = {
.ids = acpi_lpss_device_ids,
.attach = acpi_lpss_create_device,
.bind = acpi_lpss_bind,
.unbind = acpi_lpss_unbind,
};
void __init acpi_lpss_init(void)

12
drivers/acpi/glue.c
View file

@ -287,6 +287,7 @@ EXPORT_SYMBOL_GPL(acpi_unbind_one);
static int acpi_platform_notify(struct device *dev)
{
struct acpi_bus_type *type = acpi_get_bus_type(dev);
struct acpi_device *adev;
int ret;
ret = acpi_bind_one(dev, NULL);
@ -303,9 +304,14 @@ static int acpi_platform_notify(struct device *dev)
if (ret)
goto out;
}
adev = ACPI_COMPANION(dev);
if (!adev)
goto out;
if (type && type->setup)
type->setup(dev);
else if (adev->handler && adev->handler->bind)
adev->handler->bind(dev);
out:
#if ACPI_GLUE_DEBUG
@ -324,11 +330,17 @@ static int acpi_platform_notify(struct device *dev)
static int acpi_platform_notify_remove(struct device *dev)
{
struct acpi_device *adev = ACPI_COMPANION(dev);
struct acpi_bus_type *type;
if (!adev)
return 0;
type = acpi_get_bus_type(dev);
if (type && type->cleanup)
type->cleanup(dev);
else if (adev->handler && adev->handler->unbind)
adev->handler->unbind(dev);
acpi_unbind_one(dev);
return 0;

9
drivers/acpi/scan.c
View file

@ -2072,13 +2072,14 @@ static int acpi_scan_attach_handler(struct acpi_device *device)
handler = acpi_scan_match_handler(hwid->id, &devid);
if (handler) {
device->handler = handler;
ret = handler->attach(device, devid);
if (ret > 0) {
device->handler = handler;
if (ret > 0)
break;
} else if (ret < 0) {
device->handler = NULL;
if (ret < 0)
break;
}
}
}
return ret;

3
drivers/base/power/Makefile
View file

@ -1,6 +1,5 @@
obj-$(CONFIG_PM) += sysfs.o generic_ops.o common.o qos.o
obj-$(CONFIG_PM) += sysfs.o generic_ops.o common.o qos.o runtime.o
obj-$(CONFIG_PM_SLEEP) += main.o wakeup.o
obj-$(CONFIG_PM_RUNTIME) += runtime.o
obj-$(CONFIG_PM_TRACE_RTC) += trace.o
obj-$(CONFIG_PM_OPP) += opp.o
obj-$(CONFIG_PM_GENERIC_DOMAINS) += domain.o domain_governor.o

2
drivers/base/power/domain.c
View file

@ -42,7 +42,7 @@
struct gpd_timing_data *__td = &dev_gpd_data(dev)->td; \
if (!__retval && __elapsed > __td->field) { \
__td->field = __elapsed; \
dev_warn(dev, name " latency exceeded, new value %lld ns\n", \
dev_dbg(dev, name " latency exceeded, new value %lld ns\n", \
__elapsed); \
genpd->max_off_time_changed = true; \
__td->constraint_changed = true; \

4
drivers/base/power/power.h
View file

@ -89,8 +89,8 @@ extern void dpm_sysfs_remove(struct device *dev);
extern void rpm_sysfs_remove(struct device *dev);
extern int wakeup_sysfs_add(struct device *dev);
extern void wakeup_sysfs_remove(struct device *dev);
extern int pm_qos_sysfs_add_latency(struct device *dev);
extern void pm_qos_sysfs_remove_latency(struct device *dev);
extern int pm_qos_sysfs_add_resume_latency(struct device *dev);
extern void pm_qos_sysfs_remove_resume_latency(struct device *dev);
extern int pm_qos_sysfs_add_flags(struct device *dev);
extern void pm_qos_sysfs_remove_flags(struct device *dev);

220
drivers/base/power/qos.c
View file

@ -105,7 +105,7 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_flags);
s32 __dev_pm_qos_read_value(struct device *dev)
{
return IS_ERR_OR_NULL(dev->power.qos) ?
0 : pm_qos_read_value(&dev->power.qos->latency);
0 : pm_qos_read_value(&dev->power.qos->resume_latency);
}
/**
@ -141,16 +141,24 @@ static int apply_constraint(struct dev_pm_qos_request *req,
int ret;
switch(req->type) {
case DEV_PM_QOS_LATENCY:
ret = pm_qos_update_target(&qos->latency, &req->data.pnode,
action, value);
case DEV_PM_QOS_RESUME_LATENCY:
ret = pm_qos_update_target(&qos->resume_latency,
&req->data.pnode, action, value);
if (ret) {
value = pm_qos_read_value(&qos->latency);
value = pm_qos_read_value(&qos->resume_latency);
blocking_notifier_call_chain(&dev_pm_notifiers,
(unsigned long)value,
req);
}
break;
case DEV_PM_QOS_LATENCY_TOLERANCE:
ret = pm_qos_update_target(&qos->latency_tolerance,
&req->data.pnode, action, value);
if (ret) {
value = pm_qos_read_value(&qos->latency_tolerance);
req->dev->power.set_latency_tolerance(req->dev, value);
}
break;
case DEV_PM_QOS_FLAGS:
ret = pm_qos_update_flags(&qos->flags, &req->data.flr,
action, value);
@ -186,13 +194,21 @@ static int dev_pm_qos_constraints_allocate(struct device *dev)
}
BLOCKING_INIT_NOTIFIER_HEAD(n);
c = &qos->latency;
c = &qos->resume_latency;
plist_head_init(&c->list);
c->target_value = PM_QOS_DEV_LAT_DEFAULT_VALUE;
c->default_value = PM_QOS_DEV_LAT_DEFAULT_VALUE;
c->target_value = PM_QOS_RESUME_LATENCY_DEFAULT_VALUE;
c->default_value = PM_QOS_RESUME_LATENCY_DEFAULT_VALUE;
c->no_constraint_value = PM_QOS_RESUME_LATENCY_DEFAULT_VALUE;
c->type = PM_QOS_MIN;
c->notifiers = n;
c = &qos->latency_tolerance;
plist_head_init(&c->list);
c->target_value = PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE;
c->default_value = PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE;
c->no_constraint_value = PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT;
c->type = PM_QOS_MIN;
INIT_LIST_HEAD(&qos->flags.list);
spin_lock_irq(&dev->power.lock);
@ -224,7 +240,7 @@ void dev_pm_qos_constraints_destroy(struct device *dev)
* If the device's PM QoS resume latency limit or PM QoS flags have been
* exposed to user space, they have to be hidden at this point.
*/
pm_qos_sysfs_remove_latency(dev);
pm_qos_sysfs_remove_resume_latency(dev);
pm_qos_sysfs_remove_flags(dev);
mutex_lock(&dev_pm_qos_mtx);
@ -237,7 +253,7 @@ void dev_pm_qos_constraints_destroy(struct device *dev)
goto out;
/* Flush the constraints lists for the device. */
c = &qos->latency;
c = &qos->resume_latency;
plist_for_each_entry_safe(req, tmp, &c->list, data.pnode) {
/*
* Update constraints list and call the notification
@ -246,6 +262,11 @@ void dev_pm_qos_constraints_destroy(struct device *dev)
apply_constraint(req, PM_QOS_REMOVE_REQ, PM_QOS_DEFAULT_VALUE);
memset(req, 0, sizeof(*req));
}
c = &qos->latency_tolerance;
plist_for_each_entry_safe(req, tmp, &c->list, data.pnode) {
apply_constraint(req, PM_QOS_REMOVE_REQ, PM_QOS_DEFAULT_VALUE);
memset(req, 0, sizeof(*req));
}
f = &qos->flags;
list_for_each_entry_safe(req, tmp, &f->list, data.flr.node) {
apply_constraint(req, PM_QOS_REMOVE_REQ, PM_QOS_DEFAULT_VALUE);
@ -265,6 +286,40 @@ void dev_pm_qos_constraints_destroy(struct device *dev)
mutex_unlock(&dev_pm_qos_sysfs_mtx);
}
static bool dev_pm_qos_invalid_request(struct device *dev,
struct dev_pm_qos_request *req)
{
return !req || (req->type == DEV_PM_QOS_LATENCY_TOLERANCE
&& !dev->power.set_latency_tolerance);
}
static int __dev_pm_qos_add_request(struct device *dev,
struct dev_pm_qos_request *req,
enum dev_pm_qos_req_type type, s32 value)
{
int ret = 0;
if (!dev || dev_pm_qos_invalid_request(dev, req))
return -EINVAL;
if (WARN(dev_pm_qos_request_active(req),
"%s() called for already added request\n", __func__))
return -EINVAL;
if (IS_ERR(dev->power.qos))
ret = -ENODEV;
else if (!dev->power.qos)
ret = dev_pm_qos_constraints_allocate(dev);
trace_dev_pm_qos_add_request(dev_name(dev), type, value);
if (!ret) {
req->dev = dev;
req->type = type;
ret = apply_constraint(req, PM_QOS_ADD_REQ, value);
}
return ret;
}
/**
* dev_pm_qos_add_request - inserts new qos request into the list
* @dev: target device for the constraint
@ -290,31 +345,11 @@ void dev_pm_qos_constraints_destroy(struct device *dev)
int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
enum dev_pm_qos_req_type type, s32 value)
{
int ret = 0;
if (!dev || !req) /*guard against callers passing in null */
return -EINVAL;
if (WARN(dev_pm_qos_request_active(req),
"%s() called for already added request\n", __func__))
return -EINVAL;
int ret;
mutex_lock(&dev_pm_qos_mtx);
if (IS_ERR(dev->power.qos))
ret = -ENODEV;
else if (!dev->power.qos)
ret = dev_pm_qos_constraints_allocate(dev);
trace_dev_pm_qos_add_request(dev_name(dev), type, value);
if (!ret) {
req->dev = dev;
req->type = type;
ret = apply_constraint(req, PM_QOS_ADD_REQ, value);
}
ret = __dev_pm_qos_add_request(dev, req, type, value);
mutex_unlock(&dev_pm_qos_mtx);
return ret;
}
EXPORT_SYMBOL_GPL(dev_pm_qos_add_request);
@ -341,7 +376,8 @@ static int __dev_pm_qos_update_request(struct dev_pm_qos_request *req,
return -ENODEV;
switch(req->type) {
case DEV_PM_QOS_LATENCY:
case DEV_PM_QOS_RESUME_LATENCY:
case DEV_PM_QOS_LATENCY_TOLERANCE:
curr_value = req->data.pnode.prio;
break;
case DEV_PM_QOS_FLAGS:
@ -460,8 +496,8 @@ int dev_pm_qos_add_notifier(struct device *dev, struct notifier_block *notifier)
ret = dev_pm_qos_constraints_allocate(dev);
if (!ret)
ret = blocking_notifier_chain_register(
dev->power.qos->latency.notifiers, notifier);
ret = blocking_notifier_chain_register(dev->power.qos->resume_latency.notifiers,
notifier);
mutex_unlock(&dev_pm_qos_mtx);
return ret;
@ -487,9 +523,8 @@ int dev_pm_qos_remove_notifier(struct device *dev,
/* Silently return if the constraints object is not present. */
if (!IS_ERR_OR_NULL(dev->power.qos))
retval = blocking_notifier_chain_unregister(
dev->power.qos->latency.notifiers,
notifier);
retval = blocking_notifier_chain_unregister(dev->power.qos->resume_latency.notifiers,
notifier);
mutex_unlock(&dev_pm_qos_mtx);
return retval;
@ -530,20 +565,32 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_remove_global_notifier);
* dev_pm_qos_add_ancestor_request - Add PM QoS request for device's ancestor.
* @dev: Device whose ancestor to add the request for.
* @req: Pointer to the preallocated handle.
* @type: Type of the request.
* @value: Constraint latency value.
*/
int dev_pm_qos_add_ancestor_request(struct device *dev,
struct dev_pm_qos_request *req, s32 value)
struct dev_pm_qos_request *req,
enum dev_pm_qos_req_type type, s32 value)
{
struct device *ancestor = dev->parent;
int ret = -ENODEV;
while (ancestor && !ancestor->power.ignore_children)
ancestor = ancestor->parent;
switch (type) {
case DEV_PM_QOS_RESUME_LATENCY:
while (ancestor && !ancestor->power.ignore_children)
ancestor = ancestor->parent;
break;
case DEV_PM_QOS_LATENCY_TOLERANCE:
while (ancestor && !ancestor->power.set_latency_tolerance)
ancestor = ancestor->parent;
break;
default:
ancestor = NULL;
}
if (ancestor)
ret = dev_pm_qos_add_request(ancestor, req,
DEV_PM_QOS_LATENCY, value);
ret = dev_pm_qos_add_request(ancestor, req, type, value);
if (ret < 0)
req->dev = NULL;
@ -559,9 +606,13 @@ static void __dev_pm_qos_drop_user_request(struct device *dev,
struct dev_pm_qos_request *req = NULL;
switch(type) {
case DEV_PM_QOS_LATENCY:
req = dev->power.qos->latency_req;
dev->power.qos->latency_req = NULL;
case DEV_PM_QOS_RESUME_LATENCY:
req = dev->power.qos->resume_latency_req;
dev->power.qos->resume_latency_req = NULL;
break;
case DEV_PM_QOS_LATENCY_TOLERANCE:
req = dev->power.qos->latency_tolerance_req;
dev->power.qos->latency_tolerance_req = NULL;
break;
case DEV_PM_QOS_FLAGS:
req = dev->power.qos->flags_req;
@ -597,7 +648,7 @@ int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
if (!req)
return -ENOMEM;
ret = dev_pm_qos_add_request(dev, req, DEV_PM_QOS_LATENCY, value);
ret = dev_pm_qos_add_request(dev, req, DEV_PM_QOS_RESUME_LATENCY, value);
if (ret < 0) {
kfree(req);
return ret;
@ -609,7 +660,7 @@ int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
if (IS_ERR_OR_NULL(dev->power.qos))
ret = -ENODEV;
else if (dev->power.qos->latency_req)
else if (dev->power.qos->resume_latency_req)
ret = -EEXIST;
if (ret < 0) {
@ -618,13 +669,13 @@ int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
mutex_unlock(&dev_pm_qos_mtx);
goto out;
}
dev->power.qos->latency_req = req;
dev->power.qos->resume_latency_req = req;
mutex_unlock(&dev_pm_qos_mtx);
ret = pm_qos_sysfs_add_latency(dev);
ret = pm_qos_sysfs_add_resume_latency(dev);
if (ret)
dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_LATENCY);
dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_RESUME_LATENCY);
out:
mutex_unlock(&dev_pm_qos_sysfs_mtx);
@ -634,8 +685,8 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_expose_latency_limit);
static void __dev_pm_qos_hide_latency_limit(struct device *dev)
{
if (!IS_ERR_OR_NULL(dev->power.qos) && dev->power.qos->latency_req)
__dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_LATENCY);
if (!IS_ERR_OR_NULL(dev->power.qos) && dev->power.qos->resume_latency_req)
__dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_RESUME_LATENCY);
}
/**
@ -646,7 +697,7 @@ void dev_pm_qos_hide_latency_limit(struct device *dev)
{
mutex_lock(&dev_pm_qos_sysfs_mtx);
pm_qos_sysfs_remove_latency(dev);
pm_qos_sysfs_remove_resume_latency(dev);
mutex_lock(&dev_pm_qos_mtx);
__dev_pm_qos_hide_latency_limit(dev);
@ -768,6 +819,67 @@ int dev_pm_qos_update_flags(struct device *dev, s32 mask, bool set)
pm_runtime_put(dev);
return ret;
}
/**
* dev_pm_qos_get_user_latency_tolerance - Get user space latency tolerance.
* @dev: Device to obtain the user space latency tolerance for.
*/
s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev)
{
s32 ret;
mutex_lock(&dev_pm_qos_mtx);
ret = IS_ERR_OR_NULL(dev->power.qos)
|| !dev->power.qos->latency_tolerance_req ?
PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT :
dev->power.qos->latency_tolerance_req->data.pnode.prio;
mutex_unlock(&dev_pm_qos_mtx);
return ret;
}
/**
* dev_pm_qos_update_user_latency_tolerance - Update user space latency tolerance.
* @dev: Device to update the user space latency tolerance for.
* @val: New user space latency tolerance for @dev (negative values disable).
*/
int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val)
{
int ret;
mutex_lock(&dev_pm_qos_mtx);
if (IS_ERR_OR_NULL(dev->power.qos)
|| !dev->power.qos->latency_tolerance_req) {
struct dev_pm_qos_request *req;
if (val < 0) {
ret = -EINVAL;
goto out;
}
req = kzalloc(sizeof(*req), GFP_KERNEL);
if (!req) {
ret = -ENOMEM;
goto out;
}
ret = __dev_pm_qos_add_request(dev, req, DEV_PM_QOS_LATENCY_TOLERANCE, val);
if (ret < 0) {
kfree(req);
goto out;
}
dev->power.qos->latency_tolerance_req = req;
} else {
if (val < 0) {
__dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_LATENCY_TOLERANCE);
ret = 0;
} else {
ret = __dev_pm_qos_update_request(dev->power.qos->latency_tolerance_req, val);
}
}
out:
mutex_unlock(&dev_pm_qos_mtx);
return ret;
}
#else /* !CONFIG_PM_RUNTIME */
static void __dev_pm_qos_hide_latency_limit(struct device *dev) {}
static void __dev_pm_qos_hide_flags(struct device *dev) {}

162
drivers/base/power/runtime.c
View file

@ -13,6 +13,43 @@
#include <trace/events/rpm.h>
#include "power.h"
#define RPM_GET_CALLBACK(dev, cb) \
({ \
int (*__rpm_cb)(struct device *__d); \
\
if (dev->pm_domain) \
__rpm_cb = dev->pm_domain->ops.cb; \
else if (dev->type && dev->type->pm) \
__rpm_cb = dev->type->pm->cb; \
else if (dev->class && dev->class->pm) \
__rpm_cb = dev->class->pm->cb; \
else if (dev->bus && dev->bus->pm) \
__rpm_cb = dev->bus->pm->cb; \
else \
__rpm_cb = NULL; \
\
if (!__rpm_cb && dev->driver && dev->driver->pm) \
__rpm_cb = dev->driver->pm->cb; \
\
__rpm_cb; \
})
static int (*rpm_get_suspend_cb(struct device *dev))(struct device *)
{
return RPM_GET_CALLBACK(dev, runtime_suspend);
}
static int (*rpm_get_resume_cb(struct device *dev))(struct device *)
{
return RPM_GET_CALLBACK(dev, runtime_resume);
}
#ifdef CONFIG_PM_RUNTIME
static int (*rpm_get_idle_cb(struct device *dev))(struct device *)
{
return RPM_GET_CALLBACK(dev, runtime_idle);
}
static int rpm_resume(struct device *dev, int rpmflags);
static int rpm_suspend(struct device *dev, int rpmflags);
@ -310,19 +347,7 @@ static int rpm_idle(struct device *dev, int rpmflags)
dev->power.idle_notification = true;
if (dev->pm_domain)
callback = dev->pm_domain->ops.runtime_idle;
else if (dev->type && dev->type->pm)
callback = dev->type->pm->runtime_idle;
else if (dev->class && dev->class->pm)
callback = dev->class->pm->runtime_idle;
else if (dev->bus && dev->bus->pm)
callback = dev->bus->pm->runtime_idle;
else
callback = NULL;
if (!callback && dev->driver && dev->driver->pm)
callback = dev->driver->pm->runtime_idle;
callback = rpm_get_idle_cb(dev);
if (callback)
retval = __rpm_callback(callback, dev);
@ -492,19 +517,7 @@ static int rpm_suspend(struct device *dev, int rpmflags)
__update_runtime_status(dev, RPM_SUSPENDING);
if (dev->pm_domain)
callback = dev->pm_domain->ops.runtime_suspend;
else if (dev->type && dev->type->pm)
callback = dev->type->pm->runtime_suspend;
else if (dev->class && dev->class->pm)
callback = dev->class->pm->runtime_suspend;
else if (dev->bus && dev->bus->pm)
callback = dev->bus->pm->runtime_suspend;
else
callback = NULL;
if (!callback && dev->driver && dev->driver->pm)
callback = dev->driver->pm->runtime_suspend;
callback = rpm_get_suspend_cb(dev);
retval = rpm_callback(callback, dev);
if (retval)
@ -724,19 +737,7 @@ static int rpm_resume(struct device *dev, int rpmflags)
__update_runtime_status(dev, RPM_RESUMING);
if (dev->pm_domain)
callback = dev->pm_domain->ops.runtime_resume;
else if (dev->type && dev->type->pm)
callback = dev->type->pm->runtime_resume;
else if (dev->class && dev->class->pm)
callback = dev->class->pm->runtime_resume;
else if (dev->bus && dev->bus->pm)
callback = dev->bus->pm->runtime_resume;
else
callback = NULL;
if (!callback && dev->driver && dev->driver->pm)
callback = dev->driver->pm->runtime_resume;
callback = rpm_get_resume_cb(dev);
retval = rpm_callback(callback, dev);
if (retval) {
@ -1401,3 +1402,86 @@ void pm_runtime_remove(struct device *dev)
if (dev->power.irq_safe && dev->parent)
pm_runtime_put(dev->parent);
}
#endif
/**
* pm_runtime_force_suspend - Force a device into suspend state if needed.
* @dev: Device to suspend.
*
* Disable runtime PM so we safely can check the device's runtime PM status and
* if it is active, invoke it's .runtime_suspend callback to bring it into
* suspend state. Keep runtime PM disabled to preserve the state unless we
* encounter errors.
*
* Typically this function may be invoked from a system suspend callback to make
* sure the device is put into low power state.
*/
int pm_runtime_force_suspend(struct device *dev)
{
int (*callback)(struct device *);
int ret = 0;
pm_runtime_disable(dev);
/*
* Note that pm_runtime_status_suspended() returns false while
* !CONFIG_PM_RUNTIME, which means the device will be put into low
* power state.
*/
if (pm_runtime_status_suspended(dev))
return 0;
callback = rpm_get_suspend_cb(dev);
if (!callback) {
ret = -ENOSYS;
goto err;
}
ret = callback(dev);
if (ret)
goto err;
pm_runtime_set_suspended(dev);
return 0;
err:
pm_runtime_enable(dev);
return ret;
}
EXPORT_SYMBOL_GPL(pm_runtime_force_suspend);
/**
* pm_runtime_force_resume - Force a device into resume state.
* @dev: Device to resume.
*
* Prior invoking this function we expect the user to have brought the device
* into low power state by a call to pm_runtime_force_suspend(). Here we reverse
* those actions and brings the device into full power. We update the runtime PM
* status and re-enables runtime PM.
*
* Typically this function may be invoked from a system resume callback to make
* sure the device is put into full power state.
*/
int pm_runtime_force_resume(struct device *dev)
{
int (*callback)(struct device *);
int ret = 0;
callback = rpm_get_resume_cb(dev);
if (!callback) {
ret = -ENOSYS;
goto out;
}
ret = callback(dev);
if (ret)
goto out;
pm_runtime_set_active(dev);
pm_runtime_mark_last_busy(dev);
out:
pm_runtime_enable(dev);
return ret;
}
EXPORT_SYMBOL_GPL(pm_runtime_force_resume);

97
drivers/base/power/sysfs.c
View file

@ -218,15 +218,16 @@ static ssize_t autosuspend_delay_ms_store(struct device *dev,
static DEVICE_ATTR(autosuspend_delay_ms, 0644, autosuspend_delay_ms_show,
autosuspend_delay_ms_store);
static ssize_t pm_qos_latency_show(struct device *dev,
struct device_attribute *attr, char *buf)
static ssize_t pm_qos_resume_latency_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "%d\n", dev_pm_qos_requested_latency(dev));
return sprintf(buf, "%d\n", dev_pm_qos_requested_resume_latency(dev));
}
static ssize_t pm_qos_latency_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t n)
static ssize_t pm_qos_resume_latency_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t n)
{
s32 value;
int ret;
@ -237,12 +238,47 @@ static ssize_t pm_qos_latency_store(struct device *dev,
if (value < 0)
return -EINVAL;
ret = dev_pm_qos_update_request(dev->power.qos->latency_req, value);
ret = dev_pm_qos_update_request(dev->power.qos->resume_latency_req,
value);
return ret < 0 ? ret : n;
}
static DEVICE_ATTR(pm_qos_resume_latency_us, 0644,
pm_qos_latency_show, pm_qos_latency_store);
pm_qos_resume_latency_show, pm_qos_resume_latency_store);
static ssize_t pm_qos_latency_tolerance_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
s32 value = dev_pm_qos_get_user_latency_tolerance(dev);
if (value < 0)
return sprintf(buf, "auto\n");
else if (value == PM_QOS_LATENCY_ANY)
return sprintf(buf, "any\n");
return sprintf(buf, "%d\n", value);
}
static ssize_t pm_qos_latency_tolerance_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t n)
{
s32 value;
int ret;
if (kstrtos32(buf, 0, &value)) {
if (!strcmp(buf, "auto") || !strcmp(buf, "auto\n"))
value = PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT;
else if (!strcmp(buf, "any") || !strcmp(buf, "any\n"))
value = PM_QOS_LATENCY_ANY;
}
ret = dev_pm_qos_update_user_latency_tolerance(dev, value);
return ret < 0 ? ret : n;
}
static DEVICE_ATTR(pm_qos_latency_tolerance_us, 0644,
pm_qos_latency_tolerance_show, pm_qos_latency_tolerance_store);
static ssize_t pm_qos_no_power_off_show(struct device *dev,
struct device_attribute *attr,
@ -618,15 +654,26 @@ static struct attribute_group pm_runtime_attr_group = {
.attrs = runtime_attrs,
};
static struct attribute *pm_qos_latency_attrs[] = {
static struct attribute *pm_qos_resume_latency_attrs[] = {
#ifdef CONFIG_PM_RUNTIME
&dev_attr_pm_qos_resume_latency_us.attr,
#endif /* CONFIG_PM_RUNTIME */
NULL,
};
static struct attribute_group pm_qos_latency_attr_group = {
static struct attribute_group pm_qos_resume_latency_attr_group = {
.name = power_group_name,
.attrs = pm_qos_latency_attrs,
.attrs = pm_qos_resume_latency_attrs,
};
static struct attribute *pm_qos_latency_tolerance_attrs[] = {
#ifdef CONFIG_PM_RUNTIME
&dev_attr_pm_qos_latency_tolerance_us.attr,
#endif /* CONFIG_PM_RUNTIME */
NULL,
};
static struct attribute_group pm_qos_latency_tolerance_attr_group = {
.name = power_group_name,
.attrs = pm_qos_latency_tolerance_attrs,
};
static struct attribute *pm_qos_flags_attrs[] = {
@ -654,18 +701,23 @@ int dpm_sysfs_add(struct device *dev)
if (rc)
goto err_out;
}
if (device_can_wakeup(dev)) {
rc = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
if (rc) {
if (pm_runtime_callbacks_present(dev))
sysfs_unmerge_group(&dev->kobj,
&pm_runtime_attr_group);
goto err_out;
}
if (rc)
goto err_runtime;
}
if (dev->power.set_latency_tolerance) {
rc = sysfs_merge_group(&dev->kobj,
&pm_qos_latency_tolerance_attr_group);
if (rc)
goto err_wakeup;
}
return 0;
err_wakeup:
sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
err_runtime:
sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
err_out:
sysfs_remove_group(&dev->kobj, &pm_attr_group);
return rc;
@ -681,14 +733,14 @@ void wakeup_sysfs_remove(struct device *dev)
sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
}
int pm_qos_sysfs_add_latency(struct device *dev)
int pm_qos_sysfs_add_resume_latency(struct device *dev)
{
return sysfs_merge_group(&dev->kobj, &pm_qos_latency_attr_group);
return sysfs_merge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
}
void pm_qos_sysfs_remove_latency(struct device *dev)
void pm_qos_sysfs_remove_resume_latency(struct device *dev)
{
sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_attr_group);
sysfs_unmerge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
}
int pm_qos_sysfs_add_flags(struct device *dev)
@ -708,6 +760,7 @@ void rpm_sysfs_remove(struct device *dev)
void dpm_sysfs_remove(struct device *dev)
{
sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
dev_pm_qos_constraints_destroy(dev);
rpm_sysfs_remove(dev);
sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);

3
drivers/input/touchscreen/st1232.c
View file

@ -134,7 +134,8 @@ static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
} else if (!ts->low_latency_req.dev) {
/* First contact, request 100 us latency. */
dev_pm_qos_add_ancestor_request(&ts->client->dev,
&ts->low_latency_req, 100);
&ts->low_latency_req,
DEV_PM_QOS_RESUME_LATENCY, 100);
}
/* SYN_REPORT */

2
drivers/mtd/nand/sh_flctl.c
View file

@ -897,7 +897,7 @@ static void flctl_select_chip(struct mtd_info *mtd, int chipnr)
if (!flctl->qos_request) {
ret = dev_pm_qos_add_request(&flctl->pdev->dev,
&flctl->pm_qos,
DEV_PM_QOS_LATENCY,
DEV_PM_QOS_RESUME_LATENCY,
100);
if (ret < 0)
dev_err(&flctl->pdev->dev,

2
include/acpi/acpi_bus.h
View file

@ -133,6 +133,8 @@ struct acpi_scan_handler {
struct list_head list_node;
int (*attach)(struct acpi_device *dev, const struct acpi_device_id *id);
void (*detach)(struct acpi_device *dev);
void (*bind)(struct device *phys_dev);
void (*unbind)(struct device *phys_dev);
struct acpi_hotplug_profile hotplug;
};

1
include/linux/pm.h
View file

@ -582,6 +582,7 @@ struct dev_pm_info {
unsigned long accounting_timestamp;
#endif
struct pm_subsys_data *subsys_data; /* Owned by the subsystem. */
void (*set_latency_tolerance)(struct device *, s32);
struct dev_pm_qos *qos;
};

34
include/linux/pm_qos.h
View file

@ -32,7 +32,10 @@ enum pm_qos_flags_status {
#define PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC)
#define PM_QOS_NETWORK_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC)
#define PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE 0
#define PM_QOS_DEV_LAT_DEFAULT_VALUE 0
#define PM_QOS_RESUME_LATENCY_DEFAULT_VALUE 0
#define PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE 0
#define PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT (-1)
#define PM_QOS_LATENCY_ANY ((s32)(~(__u32)0 >> 1))
#define PM_QOS_FLAG_NO_POWER_OFF (1 << 0)
#define PM_QOS_FLAG_REMOTE_WAKEUP (1 << 1)
@ -49,7 +52,8 @@ struct pm_qos_flags_request {
};
enum dev_pm_qos_req_type {
DEV_PM_QOS_LATENCY = 1,
DEV_PM_QOS_RESUME_LATENCY = 1,
DEV_PM_QOS_LATENCY_TOLERANCE,
DEV_PM_QOS_FLAGS,
};
@ -77,6 +81,7 @@ struct pm_qos_constraints {
struct plist_head list;
s32 target_value; /* Do not change to 64 bit */
s32 default_value;
s32 no_constraint_value;
enum pm_qos_type type;
struct blocking_notifier_head *notifiers;
};
@ -87,9 +92,11 @@ struct pm_qos_flags {
};
struct dev_pm_qos {
struct pm_qos_constraints latency;
struct pm_qos_constraints resume_latency;
struct pm_qos_constraints latency_tolerance;
struct pm_qos_flags flags;
struct dev_pm_qos_request *latency_req;
struct dev_pm_qos_request *resume_latency_req;
struct dev_pm_qos_request *latency_tolerance_req;
struct dev_pm_qos_request *flags_req;
};
@ -142,7 +149,8 @@ int dev_pm_qos_remove_global_notifier(struct notifier_block *notifier);
void dev_pm_qos_constraints_init(struct device *dev);
void dev_pm_qos_constraints_destroy(struct device *dev);
int dev_pm_qos_add_ancestor_request(struct device *dev,
struct dev_pm_qos_request *req, s32 value);
struct dev_pm_qos_request *req,
enum dev_pm_qos_req_type type, s32 value);
#else
static inline enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev,
s32 mask)
@ -185,7 +193,9 @@ static inline void dev_pm_qos_constraints_destroy(struct device *dev)
dev->power.power_state = PMSG_INVALID;
}
static inline int dev_pm_qos_add_ancestor_request(struct device *dev,
struct dev_pm_qos_request *req, s32 value)
struct dev_pm_qos_request *req,
enum dev_pm_qos_req_type type,
s32 value)
{ return 0; }
#endif
@ -195,10 +205,12 @@ void dev_pm_qos_hide_latency_limit(struct device *dev);
int dev_pm_qos_expose_flags(struct device *dev, s32 value);
void dev_pm_qos_hide_flags(struct device *dev);
int dev_pm_qos_update_flags(struct device *dev, s32 mask, bool set);
s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev);
int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val);
static inline s32 dev_pm_qos_requested_latency(struct device *dev)
static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev)
{
return dev->power.qos->latency_req->data.pnode.prio;
return dev->power.qos->resume_latency_req->data.pnode.prio;
}
static inline s32 dev_pm_qos_requested_flags(struct device *dev)
@ -214,8 +226,12 @@ static inline int dev_pm_qos_expose_flags(struct device *dev, s32 value)
static inline void dev_pm_qos_hide_flags(struct device *dev) {}
static inline int dev_pm_qos_update_flags(struct device *dev, s32 m, bool set)
{ return 0; }
static inline s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev)
{ return PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT; }
static inline int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val)
{ return 0; }
static inline s32 dev_pm_qos_requested_latency(struct device *dev) { return 0; }
static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev) { return 0; }
static inline s32 dev_pm_qos_requested_flags(struct device *dev) { return 0; }
#endif

4
include/linux/pm_runtime.h
View file

@ -26,9 +26,13 @@
#ifdef CONFIG_PM
extern int pm_generic_runtime_suspend(struct device *dev);
extern int pm_generic_runtime_resume(struct device *dev);
extern int pm_runtime_force_suspend(struct device *dev);
extern int pm_runtime_force_resume(struct device *dev);
#else
static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; }
static inline int pm_generic_runtime_resume(struct device *dev) { return 0; }
static inline int pm_runtime_force_suspend(struct device *dev) { return 0; }
static inline int pm_runtime_force_resume(struct device *dev) { return 0; }
#endif
#ifdef CONFIG_PM_RUNTIME

4
include/trace/events/power.h
View file

@ -407,8 +407,8 @@ DECLARE_EVENT_CLASS(dev_pm_qos_request,
TP_printk("device=%s type=%s new_value=%d",
__get_str(name),
__print_symbolic(__entry->type,
{ DEV_PM_QOS_LATENCY, "DEV_PM_QOS_LATENCY" },
{ DEV_PM_QOS_FLAGS, "DEV_PM_QOS_FLAGS" }),
{ DEV_PM_QOS_RESUME_LATENCY, "DEV_PM_QOS_RESUME_LATENCY" },
{ DEV_PM_QOS_FLAGS, "DEV_PM_QOS_FLAGS" }),
__entry->new_value)
);

18
kernel/power/qos.c
View file

@ -66,6 +66,7 @@ static struct pm_qos_constraints cpu_dma_constraints = {
.list = PLIST_HEAD_INIT(cpu_dma_constraints.list),
.target_value = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE,
.default_value = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE,
.no_constraint_value = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE,
.type = PM_QOS_MIN,
.notifiers = &cpu_dma_lat_notifier,
};
@ -79,6 +80,7 @@ static struct pm_qos_constraints network_lat_constraints = {
.list = PLIST_HEAD_INIT(network_lat_constraints.list),
.target_value = PM_QOS_NETWORK_LAT_DEFAULT_VALUE,
.default_value = PM_QOS_NETWORK_LAT_DEFAULT_VALUE,
.no_constraint_value = PM_QOS_NETWORK_LAT_DEFAULT_VALUE,
.type = PM_QOS_MIN,
.notifiers = &network_lat_notifier,
};
@ -93,6 +95,7 @@ static struct pm_qos_constraints network_tput_constraints = {
.list = PLIST_HEAD_INIT(network_tput_constraints.list),
.target_value = PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE,
.default_value = PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE,
.no_constraint_value = PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE,
.type = PM_QOS_MAX,
.notifiers = &network_throughput_notifier,
};
@ -128,7 +131,7 @@ static const struct file_operations pm_qos_power_fops = {
static inline int pm_qos_get_value(struct pm_qos_constraints *c)
{
if (plist_head_empty(&c->list))
return c->default_value;
return c->no_constraint_value;
switch (c->type) {
case PM_QOS_MIN:
@ -170,6 +173,7 @@ int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
{
unsigned long flags;
int prev_value, curr_value, new_value;
int ret;
spin_lock_irqsave(&pm_qos_lock, flags);
prev_value = pm_qos_get_value(c);
@ -205,13 +209,15 @@ int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
trace_pm_qos_update_target(action, prev_value, curr_value);
if (prev_value != curr_value) {
blocking_notifier_call_chain(c->notifiers,
(unsigned long)curr_value,
NULL);
return 1;
ret = 1;
if (c->notifiers)
blocking_notifier_call_chain(c->notifiers,
(unsigned long)curr_value,
NULL);
} else {
return 0;
ret = 0;
}
return ret;
}
/**