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Merge back PM core material for v4.16.

This commit is contained in:
Rafael J. Wysocki 2017-12-16 02:05:48 +01:00
parent 3487972d7f 34fb8f0ba9
commit c51a024e39
7 changed files with 253 additions and 133 deletions
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27
Documentation/driver-api/pm/devices.rst
View File

@ -788,6 +788,29 @@ must reflect the "active" status for runtime PM in that case.
During system-wide resume from a sleep state it's easiest to put devices into
the full-power state, as explained in :file:`Documentation/power/runtime_pm.txt`.
Refer to that document for more information regarding this particular issue as
[Refer to that document for more information regarding this particular issue as
well as for information on the device runtime power management framework in
general.
general.]
However, it often is desirable to leave devices in suspend after system
transitions to the working state, especially if those devices had been in
runtime suspend before the preceding system-wide suspend (or analogous)
transition. Device drivers can use the ``DPM_FLAG_LEAVE_SUSPENDED`` flag to
indicate to the PM core (and middle-layer code) that they prefer the specific
devices handled by them to be left suspended and they have no problems with
skipping their system-wide resume callbacks for this reason. Whether or not the
devices will actually be left in suspend may depend on their state before the
given system suspend-resume cycle and on the type of the system transition under
way. In particular, devices are not left suspended if that transition is a
restore from hibernation, as device states are not guaranteed to be reflected
by the information stored in the hibernation image in that case.
The middle-layer code involved in the handling of the device is expected to
indicate to the PM core if the device may be left in suspend by setting its
:c:member:`power.may_skip_resume` status bit which is checked by the PM core
during the "noirq" phase of the preceding system-wide suspend (or analogous)
transition. The middle layer is then responsible for handling the device as
appropriate in its "noirq" resume callback, which is executed regardless of
whether or not the device is left suspended, but the other resume callbacks
(except for ``->complete``) will be skipped automatically by the PM core if the
device really can be left in suspend.

11
Documentation/power/pci.txt
View File

@ -994,6 +994,17 @@ into D0 going forward), but if it is in runtime suspend in pci_pm_thaw_noirq(),
the function will set the power.direct_complete flag for it (to make the PM core
skip the subsequent "thaw" callbacks for it) and return.
Setting the DPM_FLAG_LEAVE_SUSPENDED flag means that the driver prefers the
device to be left in suspend after system-wide transitions to the working state.
This flag is checked by the PM core, but the PCI bus type informs the PM core
which devices may be left in suspend from its perspective (that happens during
the "noirq" phase of system-wide suspend and analogous transitions) and next it
uses the dev_pm_may_skip_resume() helper to decide whether or not to return from
pci_pm_resume_noirq() early, as the PM core will skip the remaining resume
callbacks for the device during the transition under way and will set its
runtime PM status to "suspended" if dev_pm_may_skip_resume() returns "true" for
it.
3.2. Device Runtime Power Management
------------------------------------
In addition to providing device power management callbacks PCI device drivers

29
drivers/acpi/device_pm.c
View File

@ -990,7 +990,7 @@ void acpi_subsys_complete(struct device *dev)
* the sleep state it is going out of and it has never been resumed till
* now, resume it in case the firmware powered it up.
*/
if (dev->power.direct_complete && pm_resume_via_firmware())
if (pm_runtime_suspended(dev) && pm_resume_via_firmware())
pm_request_resume(dev);
}
EXPORT_SYMBOL_GPL(acpi_subsys_complete);
@ -1039,10 +1039,28 @@ EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late);
*/
int acpi_subsys_suspend_noirq(struct device *dev)
{
if (dev_pm_smart_suspend_and_suspended(dev))
return 0;
int ret;
return pm_generic_suspend_noirq(dev);
if (dev_pm_smart_suspend_and_suspended(dev)) {
dev->power.may_skip_resume = true;
return 0;
}
ret = pm_generic_suspend_noirq(dev);
if (ret)
return ret;
/*
* If the target system sleep state is suspend-to-idle, it is sufficient
* to check whether or not the device's wakeup settings are good for
* runtime PM. Otherwise, the pm_resume_via_firmware() check will cause
* acpi_subsys_complete() to take care of fixing up the device's state
* anyway, if need be.
*/
dev->power.may_skip_resume = device_may_wakeup(dev) ||
!device_can_wakeup(dev);
return 0;
}
EXPORT_SYMBOL_GPL(acpi_subsys_suspend_noirq);
@ -1052,6 +1070,9 @@ EXPORT_SYMBOL_GPL(acpi_subsys_suspend_noirq);
*/
int acpi_subsys_resume_noirq(struct device *dev)
{
if (dev_pm_may_skip_resume(dev))
return 0;
/*
* Devices with DPM_FLAG_SMART_SUSPEND may be left in runtime suspend
* during system suspend, so update their runtime PM status to "active"

102
drivers/base/power/main.c
View File

@ -18,7 +18,6 @@
*/
#include <linux/device.h>
#include <linux/kallsyms.h>
#include <linux/export.h>
#include <linux/mutex.h>
#include <linux/pm.h>
@ -540,6 +539,18 @@ void dev_pm_skip_next_resume_phases(struct device *dev)
dev->power.is_suspended = false;
}
/**
* dev_pm_may_skip_resume - System-wide device resume optimization check.
* @dev: Target device.
*
* Checks whether or not the device may be left in suspend after a system-wide
* transition to the working state.
*/
bool dev_pm_may_skip_resume(struct device *dev)
{
return !dev->power.must_resume && pm_transition.event != PM_EVENT_RESTORE;
}
/**
* device_resume_noirq - Execute a "noirq resume" callback for given device.
* @dev: Device to handle.
@ -588,6 +599,18 @@ static int device_resume_noirq(struct device *dev, pm_message_t state, bool asyn
error = dpm_run_callback(callback, dev, state, info);
dev->power.is_noirq_suspended = false;
if (dev_pm_may_skip_resume(dev)) {
/*
* The device is going to be left in suspend, but it might not
* have been in runtime suspend before the system suspended, so
* its runtime PM status needs to be updated to avoid confusing
* the runtime PM framework when runtime PM is enabled for the
* device again.
*/
pm_runtime_set_suspended(dev);
dev_pm_skip_next_resume_phases(dev);
}
Out:
complete_all(&dev->power.completion);
TRACE_RESUME(error);
@ -1089,6 +1112,22 @@ static pm_message_t resume_event(pm_message_t sleep_state)
return PMSG_ON;
}
static void dpm_superior_set_must_resume(struct device *dev)
{
struct device_link *link;
int idx;
if (dev->parent)
dev->parent->power.must_resume = true;
idx = device_links_read_lock();
list_for_each_entry_rcu(link, &dev->links.suppliers, c_node)
link->supplier->power.must_resume = true;
device_links_read_unlock(idx);
}
/**
* __device_suspend_noirq - Execute a "noirq suspend" callback for given device.
* @dev: Device to handle.
@ -1140,10 +1179,28 @@ static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool a
}
error = dpm_run_callback(callback, dev, state, info);
if (!error)
dev->power.is_noirq_suspended = true;
else
if (error) {
async_error = error;
goto Complete;
}
dev->power.is_noirq_suspended = true;
if (dev_pm_test_driver_flags(dev, DPM_FLAG_LEAVE_SUSPENDED)) {
/*
* The only safe strategy here is to require that if the device
* may not be left in suspend, resume callbacks must be invoked
* for it.
*/
dev->power.must_resume = dev->power.must_resume ||
!dev->power.may_skip_resume ||
atomic_read(&dev->power.usage_count) > 1;
} else {
dev->power.must_resume = true;
}
if (dev->power.must_resume)
dpm_superior_set_must_resume(dev);
Complete:
complete_all(&dev->power.completion);
@ -1435,6 +1492,22 @@ static int legacy_suspend(struct device *dev, pm_message_t state,
return error;
}
static void dpm_propagate_to_parent(struct device *dev)
{
struct device *parent = dev->parent;
if (!parent)
return;
spin_lock_irq(&parent->power.lock);
parent->power.direct_complete = false;
if (dev->power.wakeup_path && !parent->power.ignore_children)
parent->power.wakeup_path = true;
spin_unlock_irq(&parent->power.lock);
}
static void dpm_clear_suppliers_direct_complete(struct device *dev)
{
struct device_link *link;
@ -1500,6 +1573,9 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
dev->power.direct_complete = false;
}
dev->power.may_skip_resume = false;
dev->power.must_resume = false;
dpm_watchdog_set(&wd, dev);
device_lock(dev);
@ -1543,19 +1619,8 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
End:
if (!error) {
struct device *parent = dev->parent;
dev->power.is_suspended = true;
if (parent) {
spin_lock_irq(&parent->power.lock);
dev->parent->power.direct_complete = false;
if (dev->power.wakeup_path
&& !dev->parent->power.ignore_children)
dev->parent->power.wakeup_path = true;
spin_unlock_irq(&parent->power.lock);
}
dpm_propagate_to_parent(dev);
dpm_clear_suppliers_direct_complete(dev);
}
@ -1665,8 +1730,9 @@ static int device_prepare(struct device *dev, pm_message_t state)
if (dev->power.syscore)
return 0;
WARN_ON(dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) &&
!pm_runtime_enabled(dev));
WARN_ON(!pm_runtime_enabled(dev) &&
dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND |
DPM_FLAG_LEAVE_SUSPENDED));
/*
* If a device's parent goes into runtime suspend at the wrong time,

182
drivers/base/power/sysfs.c
View File

@ -108,16 +108,10 @@ static ssize_t control_show(struct device *dev, struct device_attribute *attr,
static ssize_t control_store(struct device * dev, struct device_attribute *attr,
const char * buf, size_t n)
{
char *cp;
int len = n;
cp = memchr(buf, '\n', n);
if (cp)
len = cp - buf;
device_lock(dev);
if (len == sizeof ctrl_auto - 1 && strncmp(buf, ctrl_auto, len) == 0)
if (sysfs_streq(buf, ctrl_auto))
pm_runtime_allow(dev);
else if (len == sizeof ctrl_on - 1 && strncmp(buf, ctrl_on, len) == 0)
else if (sysfs_streq(buf, ctrl_on))
pm_runtime_forbid(dev);
else
n = -EINVAL;
@ -125,9 +119,9 @@ static ssize_t control_store(struct device * dev, struct device_attribute *attr,
return n;
}
static DEVICE_ATTR(control, 0644, control_show, control_store);
static DEVICE_ATTR_RW(control);
static ssize_t rtpm_active_time_show(struct device *dev,
static ssize_t runtime_active_time_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int ret;
@ -138,9 +132,9 @@ static ssize_t rtpm_active_time_show(struct device *dev,
return ret;
}
static DEVICE_ATTR(runtime_active_time, 0444, rtpm_active_time_show, NULL);
static DEVICE_ATTR_RO(runtime_active_time);
static ssize_t rtpm_suspended_time_show(struct device *dev,
static ssize_t runtime_suspended_time_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int ret;
@ -152,9 +146,9 @@ static ssize_t rtpm_suspended_time_show(struct device *dev,
return ret;
}
static DEVICE_ATTR(runtime_suspended_time, 0444, rtpm_suspended_time_show, NULL);
static DEVICE_ATTR_RO(runtime_suspended_time);
static ssize_t rtpm_status_show(struct device *dev,
static ssize_t runtime_status_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
const char *p;
@ -184,7 +178,7 @@ static ssize_t rtpm_status_show(struct device *dev,
return sprintf(buf, p);
}
static DEVICE_ATTR(runtime_status, 0444, rtpm_status_show, NULL);
static DEVICE_ATTR_RO(runtime_status);
static ssize_t autosuspend_delay_ms_show(struct device *dev,
struct device_attribute *attr, char *buf)
@ -211,26 +205,25 @@ static ssize_t autosuspend_delay_ms_store(struct device *dev,
return n;
}
static DEVICE_ATTR(autosuspend_delay_ms, 0644, autosuspend_delay_ms_show,
autosuspend_delay_ms_store);
static DEVICE_ATTR_RW(autosuspend_delay_ms);
static ssize_t pm_qos_resume_latency_show(struct device *dev,
struct device_attribute *attr,
char *buf)
static ssize_t pm_qos_resume_latency_us_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
s32 value = dev_pm_qos_requested_resume_latency(dev);
if (value == 0)
return sprintf(buf, "n/a\n");
else if (value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
if (value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
value = 0;
return sprintf(buf, "%d\n", value);
}
static ssize_t pm_qos_resume_latency_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t n)
static ssize_t pm_qos_resume_latency_us_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t n)
{
s32 value;
int ret;
@ -245,7 +238,7 @@ static ssize_t pm_qos_resume_latency_store(struct device *dev,
if (value == 0)
value = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
} else if (!strcmp(buf, "n/a") || !strcmp(buf, "n/a\n")) {
} else if (sysfs_streq(buf, "n/a")) {
value = 0;
} else {
return -EINVAL;
@ -256,26 +249,25 @@ static ssize_t pm_qos_resume_latency_store(struct device *dev,
return ret < 0 ? ret : n;
}
static DEVICE_ATTR(pm_qos_resume_latency_us, 0644,
pm_qos_resume_latency_show, pm_qos_resume_latency_store);
static DEVICE_ATTR_RW(pm_qos_resume_latency_us);
static ssize_t pm_qos_latency_tolerance_show(struct device *dev,
struct device_attribute *attr,
char *buf)
static ssize_t pm_qos_latency_tolerance_us_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)
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)
static ssize_t pm_qos_latency_tolerance_us_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t n)
{
s32 value;
int ret;
@ -285,9 +277,9 @@ static ssize_t pm_qos_latency_tolerance_store(struct device *dev,
if (value < 0)
return -EINVAL;
} else {
if (!strcmp(buf, "auto") || !strcmp(buf, "auto\n"))
if (sysfs_streq(buf, "auto"))
value = PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT;
else if (!strcmp(buf, "any") || !strcmp(buf, "any\n"))
else if (sysfs_streq(buf, "any"))
value = PM_QOS_LATENCY_ANY;
else
return -EINVAL;
@ -296,8 +288,7 @@ static ssize_t pm_qos_latency_tolerance_store(struct device *dev,
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 DEVICE_ATTR_RW(pm_qos_latency_tolerance_us);
static ssize_t pm_qos_no_power_off_show(struct device *dev,
struct device_attribute *attr,
@ -323,49 +314,39 @@ static ssize_t pm_qos_no_power_off_store(struct device *dev,
return ret < 0 ? ret : n;
}
static DEVICE_ATTR(pm_qos_no_power_off, 0644,
pm_qos_no_power_off_show, pm_qos_no_power_off_store);
static DEVICE_ATTR_RW(pm_qos_no_power_off);
#ifdef CONFIG_PM_SLEEP
static const char _enabled[] = "enabled";
static const char _disabled[] = "disabled";
static ssize_t
wake_show(struct device * dev, struct device_attribute *attr, char * buf)
static ssize_t wakeup_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "%s\n", device_can_wakeup(dev)
? (device_may_wakeup(dev) ? _enabled : _disabled)
: "");
}
static ssize_t
wake_store(struct device * dev, struct device_attribute *attr,
const char * buf, size_t n)
static ssize_t wakeup_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t n)
{
char *cp;
int len = n;
if (!device_can_wakeup(dev))
return -EINVAL;
cp = memchr(buf, '\n', n);
if (cp)
len = cp - buf;
if (len == sizeof _enabled - 1
&& strncmp(buf, _enabled, sizeof _enabled - 1) == 0)
if (sysfs_streq(buf, _enabled))
device_set_wakeup_enable(dev, 1);
else if (len == sizeof _disabled - 1
&& strncmp(buf, _disabled, sizeof _disabled - 1) == 0)
else if (sysfs_streq(buf, _disabled))
device_set_wakeup_enable(dev, 0);
else
return -EINVAL;
return n;
}
static DEVICE_ATTR(wakeup, 0644, wake_show, wake_store);
static DEVICE_ATTR_RW(wakeup);
static ssize_t wakeup_count_show(struct device *dev,
struct device_attribute *attr, char *buf)
struct device_attribute *attr, char *buf)
{
unsigned long count = 0;
bool enabled = false;
@ -379,10 +360,11 @@ static ssize_t wakeup_count_show(struct device *dev,
return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
}
static DEVICE_ATTR(wakeup_count, 0444, wakeup_count_show, NULL);
static DEVICE_ATTR_RO(wakeup_count);
static ssize_t wakeup_active_count_show(struct device *dev,
struct device_attribute *attr, char *buf)
struct device_attribute *attr,
char *buf)
{
unsigned long count = 0;
bool enabled = false;
@ -396,11 +378,11 @@ static ssize_t wakeup_active_count_show(struct device *dev,
return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
}
static DEVICE_ATTR(wakeup_active_count, 0444, wakeup_active_count_show, NULL);
static DEVICE_ATTR_RO(wakeup_active_count);
static ssize_t wakeup_abort_count_show(struct device *dev,
struct device_attribute *attr,
char *buf)
struct device_attribute *attr,
char *buf)
{
unsigned long count = 0;
bool enabled = false;
@ -414,7 +396,7 @@ static ssize_t wakeup_abort_count_show(struct device *dev,
return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
}
static DEVICE_ATTR(wakeup_abort_count, 0444, wakeup_abort_count_show, NULL);
static DEVICE_ATTR_RO(wakeup_abort_count);
static ssize_t wakeup_expire_count_show(struct device *dev,
struct device_attribute *attr,
@ -432,10 +414,10 @@ static ssize_t wakeup_expire_count_show(struct device *dev,
return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
}
static DEVICE_ATTR(wakeup_expire_count, 0444, wakeup_expire_count_show, NULL);
static DEVICE_ATTR_RO(wakeup_expire_count);
static ssize_t wakeup_active_show(struct device *dev,
struct device_attribute *attr, char *buf)
struct device_attribute *attr, char *buf)
{
unsigned int active = 0;
bool enabled = false;
@ -449,10 +431,11 @@ static ssize_t wakeup_active_show(struct device *dev,
return enabled ? sprintf(buf, "%u\n", active) : sprintf(buf, "\n");
}
static DEVICE_ATTR(wakeup_active, 0444, wakeup_active_show, NULL);
static DEVICE_ATTR_RO(wakeup_active);
static ssize_t wakeup_total_time_show(struct device *dev,
struct device_attribute *attr, char *buf)
static ssize_t wakeup_total_time_ms_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
s64 msec = 0;
bool enabled = false;
@ -466,10 +449,10 @@ static ssize_t wakeup_total_time_show(struct device *dev,
return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
}
static DEVICE_ATTR(wakeup_total_time_ms, 0444, wakeup_total_time_show, NULL);
static DEVICE_ATTR_RO(wakeup_total_time_ms);
static ssize_t wakeup_max_time_show(struct device *dev,
struct device_attribute *attr, char *buf)
static ssize_t wakeup_max_time_ms_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
s64 msec = 0;
bool enabled = false;
@ -483,10 +466,11 @@ static ssize_t wakeup_max_time_show(struct device *dev,
return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
}
static DEVICE_ATTR(wakeup_max_time_ms, 0444, wakeup_max_time_show, NULL);
static DEVICE_ATTR_RO(wakeup_max_time_ms);
static ssize_t wakeup_last_time_show(struct device *dev,
struct device_attribute *attr, char *buf)
static ssize_t wakeup_last_time_ms_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
s64 msec = 0;
bool enabled = false;
@ -500,12 +484,12 @@ static ssize_t wakeup_last_time_show(struct device *dev,
return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
}
static DEVICE_ATTR(wakeup_last_time_ms, 0444, wakeup_last_time_show, NULL);
static DEVICE_ATTR_RO(wakeup_last_time_ms);
#ifdef CONFIG_PM_AUTOSLEEP
static ssize_t wakeup_prevent_sleep_time_show(struct device *dev,
struct device_attribute *attr,
char *buf)
static ssize_t wakeup_prevent_sleep_time_ms_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
s64 msec = 0;
bool enabled = false;
@ -519,40 +503,39 @@ static ssize_t wakeup_prevent_sleep_time_show(struct device *dev,
return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
}
static DEVICE_ATTR(wakeup_prevent_sleep_time_ms, 0444,
wakeup_prevent_sleep_time_show, NULL);
static DEVICE_ATTR_RO(wakeup_prevent_sleep_time_ms);
#endif /* CONFIG_PM_AUTOSLEEP */
#endif /* CONFIG_PM_SLEEP */
#ifdef CONFIG_PM_ADVANCED_DEBUG
static ssize_t rtpm_usagecount_show(struct device *dev,
struct device_attribute *attr, char *buf)
static ssize_t runtime_usage_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%d\n", atomic_read(&dev->power.usage_count));
}
static DEVICE_ATTR_RO(runtime_usage);
static ssize_t rtpm_children_show(struct device *dev,
struct device_attribute *attr, char *buf)
static ssize_t runtime_active_kids_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "%d\n", dev->power.ignore_children ?
0 : atomic_read(&dev->power.child_count));
}
static DEVICE_ATTR_RO(runtime_active_kids);
static ssize_t rtpm_enabled_show(struct device *dev,
struct device_attribute *attr, char *buf)
static ssize_t runtime_enabled_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
if ((dev->power.disable_depth) && (dev->power.runtime_auto == false))
if (dev->power.disable_depth && (dev->power.runtime_auto == false))
return sprintf(buf, "disabled & forbidden\n");
else if (dev->power.disable_depth)
if (dev->power.disable_depth)
return sprintf(buf, "disabled\n");
else if (dev->power.runtime_auto == false)
if (dev->power.runtime_auto == false)
return sprintf(buf, "forbidden\n");
return sprintf(buf, "enabled\n");
}
static DEVICE_ATTR(runtime_usage, 0444, rtpm_usagecount_show, NULL);
static DEVICE_ATTR(runtime_active_kids, 0444, rtpm_children_show, NULL);
static DEVICE_ATTR(runtime_enabled, 0444, rtpm_enabled_show, NULL);
static DEVICE_ATTR_RO(runtime_enabled);
#ifdef CONFIG_PM_SLEEP
static ssize_t async_show(struct device *dev, struct device_attribute *attr,
@ -566,23 +549,16 @@ static ssize_t async_show(struct device *dev, struct device_attribute *attr,
static ssize_t async_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t n)
{
char *cp;
int len = n;
cp = memchr(buf, '\n', n);
if (cp)
len = cp - buf;
if (len == sizeof _enabled - 1 && strncmp(buf, _enabled, len) == 0)
if (sysfs_streq(buf, _enabled))
device_enable_async_suspend(dev);
else if (len == sizeof _disabled - 1 &&
strncmp(buf, _disabled, len) == 0)
else if (sysfs_streq(buf, _disabled))
device_disable_async_suspend(dev);
else
return -EINVAL;
return n;
}
static DEVICE_ATTR(async, 0644, async_show, async_store);
static DEVICE_ATTR_RW(async);
#endif /* CONFIG_PM_SLEEP */
#endif /* CONFIG_PM_ADVANCED_DEBUG */

19
drivers/pci/pci-driver.c
View File

@ -699,7 +699,7 @@ static void pci_pm_complete(struct device *dev)
pm_generic_complete(dev);
/* Resume device if platform firmware has put it in reset-power-on */
if (dev->power.direct_complete && pm_resume_via_firmware()) {
if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) {
pci_power_t pre_sleep_state = pci_dev->current_state;
pci_update_current_state(pci_dev, pci_dev->current_state);
@ -783,8 +783,10 @@ static int pci_pm_suspend_noirq(struct device *dev)
struct pci_dev *pci_dev = to_pci_dev(dev);
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
if (dev_pm_smart_suspend_and_suspended(dev))
if (dev_pm_smart_suspend_and_suspended(dev)) {
dev->power.may_skip_resume = true;
return 0;
}
if (pci_has_legacy_pm_support(pci_dev))
return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
@ -838,6 +840,16 @@ static int pci_pm_suspend_noirq(struct device *dev)
Fixup:
pci_fixup_device(pci_fixup_suspend_late, pci_dev);
/*
* If the target system sleep state is suspend-to-idle, it is sufficient
* to check whether or not the device's wakeup settings are good for
* runtime PM. Otherwise, the pm_resume_via_firmware() check will cause
* pci_pm_complete() to take care of fixing up the device's state
* anyway, if need be.
*/
dev->power.may_skip_resume = device_may_wakeup(dev) ||
!device_can_wakeup(dev);
return 0;
}
@ -847,6 +859,9 @@ static int pci_pm_resume_noirq(struct device *dev)
struct device_driver *drv = dev->driver;
int error = 0;
if (dev_pm_may_skip_resume(dev))
return 0;
/*
* Devices with DPM_FLAG_SMART_SUSPEND may be left in runtime suspend
* during system suspend, so update their runtime PM status to "active"

16
include/linux/pm.h
View File

@ -556,9 +556,10 @@ struct pm_subsys_data {
* These flags can be set by device drivers at the probe time. They need not be
* cleared by the drivers as the driver core will take care of that.
*
* NEVER_SKIP: Do not skip system suspend/resume callbacks for the device.
* NEVER_SKIP: Do not skip all system suspend/resume callbacks for the device.
* SMART_PREPARE: Check the return value of the driver's ->prepare callback.
* SMART_SUSPEND: No need to resume the device from runtime suspend.
* LEAVE_SUSPENDED: Avoid resuming the device during system resume if possible.
*
* Setting SMART_PREPARE instructs bus types and PM domains which may want
* system suspend/resume callbacks to be skipped for the device to return 0 from
@ -572,10 +573,14 @@ struct pm_subsys_data {
* necessary from the driver's perspective. It also may cause them to skip
* invocations of the ->suspend_late and ->suspend_noirq callbacks provided by
* the driver if they decide to leave the device in runtime suspend.
*
* Setting LEAVE_SUSPENDED informs the PM core and middle-layer code that the
* driver prefers the device to be left in suspend after system resume.
*/
#define DPM_FLAG_NEVER_SKIP BIT(0)
#define DPM_FLAG_SMART_PREPARE BIT(1)
#define DPM_FLAG_SMART_SUSPEND BIT(2)
#define DPM_FLAG_NEVER_SKIP BIT(0)
#define DPM_FLAG_SMART_PREPARE BIT(1)
#define DPM_FLAG_SMART_SUSPEND BIT(2)
#define DPM_FLAG_LEAVE_SUSPENDED BIT(3)
struct dev_pm_info {
pm_message_t power_state;
@ -597,6 +602,8 @@ struct dev_pm_info {
bool wakeup_path:1;
bool syscore:1;
bool no_pm_callbacks:1; /* Owned by the PM core */
unsigned int must_resume:1; /* Owned by the PM core */
unsigned int may_skip_resume:1; /* Set by subsystems */
#else
unsigned int should_wakeup:1;
#endif
@ -766,6 +773,7 @@ extern int pm_generic_poweroff(struct device *dev);
extern void pm_generic_complete(struct device *dev);
extern void dev_pm_skip_next_resume_phases(struct device *dev);
extern bool dev_pm_may_skip_resume(struct device *dev);
extern bool dev_pm_smart_suspend_and_suspended(struct device *dev);
#else /* !CONFIG_PM_SLEEP */