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Merge branch 'pm-qos'

浏览代码 
* pm-qos:
  PM / QoS: Fix device resume latency framework
  PM / QoS: Drop PM_QOS_FLAG_REMOTE_WAKEUP
这个提交包含在：
Rafael J. Wysocki
2017-11-13 01:33:48 +01:00
父节点 29aaf90875 0759e80b84
当前提交 4762573b93
共修改 11 个文件，包含 77 行新增和 102 行删除
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3
drivers/base/cpu.c
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@@ -377,7 +377,8 @@ int register_cpu(struct cpu *cpu, int num)
per_cpu(cpu_sys_devices, num) = &cpu->dev;
register_cpu_under_node(num, cpu_to_node(num));
dev_pm_qos_expose_latency_limit(&cpu->dev, 0);
dev_pm_qos_expose_latency_limit(&cpu->dev,
PM_QOS_RESUME_LATENCY_NO_CONSTRAINT);
return 0;
}

6
drivers/base/power/domain.c
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@@ -445,9 +445,7 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on,
list_for_each_entry(pdd, &genpd->dev_list, list_node) {
enum pm_qos_flags_status stat;
stat = dev_pm_qos_flags(pdd->dev,
PM_QOS_FLAG_NO_POWER_OFF
| PM_QOS_FLAG_REMOTE_WAKEUP);
stat = dev_pm_qos_flags(pdd->dev, PM_QOS_FLAG_NO_POWER_OFF);
if (stat > PM_QOS_FLAGS_NONE)
return -EBUSY;
@@ -1329,7 +1327,7 @@ static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev,
gpd_data->base.dev = dev;
gpd_data->td.constraint_changed = true;
gpd_data->td.effective_constraint_ns = 0;
gpd_data->td.effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS;
gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier;
spin_lock_irq(&dev->power.lock);

40
drivers/base/power/domain_governor.c
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@@ -33,15 +33,10 @@ static int dev_update_qos_constraint(struct device *dev, void *data)
* known at this point anyway).
*/
constraint_ns = dev_pm_qos_read_value(dev);
if (constraint_ns > 0)
constraint_ns *= NSEC_PER_USEC;
constraint_ns *= NSEC_PER_USEC;
}
/* 0 means "no constraint" */
if (constraint_ns == 0)
return 0;
if (constraint_ns < *constraint_ns_p || *constraint_ns_p == 0)
if (constraint_ns < *constraint_ns_p)
*constraint_ns_p = constraint_ns;
return 0;
@@ -69,12 +64,12 @@ static bool default_suspend_ok(struct device *dev)
}
td->constraint_changed = false;
td->cached_suspend_ok = false;
td->effective_constraint_ns = -1;
td->effective_constraint_ns = 0;
constraint_ns = __dev_pm_qos_read_value(dev);
spin_unlock_irqrestore(&dev->power.lock, flags);
if (constraint_ns < 0)
if (constraint_ns == 0)
return false;
constraint_ns *= NSEC_PER_USEC;
@@ -87,25 +82,25 @@ static bool default_suspend_ok(struct device *dev)
device_for_each_child(dev, &constraint_ns,
dev_update_qos_constraint);
if (constraint_ns == 0) {
if (constraint_ns == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS) {
/* "No restriction", so the device is allowed to suspend. */
td->effective_constraint_ns = 0;
td->effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS;
td->cached_suspend_ok = true;
} else if (constraint_ns < 0) {
} else if (constraint_ns == 0) {
/*
* This triggers if one of the children that don't belong to a
* domain has a negative PM QoS constraint and it's better not
* to suspend then. effective_constraint_ns is negative already
* and cached_suspend_ok is false, so bail out.
* domain has a zero PM QoS constraint and it's better not to
* suspend then. effective_constraint_ns is zero already and
* cached_suspend_ok is false, so bail out.
*/
return false;
} else {
constraint_ns -= td->suspend_latency_ns +
td->resume_latency_ns;
/*
* effective_constraint_ns is negative already and
* cached_suspend_ok is false, so if the computed value is not
* positive, return right away.
* effective_constraint_ns is zero already and cached_suspend_ok
* is false, so if the computed value is not positive, return
* right away.
*/
if (constraint_ns <= 0)
return false;
@@ -174,13 +169,10 @@ static bool __default_power_down_ok(struct dev_pm_domain *pd,
td = &to_gpd_data(pdd)->td;
constraint_ns = td->effective_constraint_ns;
/*
* Negative values mean "no suspend at all" and this runs only
* when all devices in the domain are suspended, so it must be
* 0 at least.
*
* 0 means "no constraint"
* Zero means "no suspend at all" and this runs only when all
* devices in the domain are suspended, so it must be positive.
*/
if (constraint_ns == 0)
if (constraint_ns == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS)
continue;
if (constraint_ns <= off_on_time_ns)

5
drivers/base/power/qos.c
查看文件

@@ -139,6 +139,9 @@ static int apply_constraint(struct dev_pm_qos_request *req,
switch(req->type) {
case DEV_PM_QOS_RESUME_LATENCY:
if (WARN_ON(action != PM_QOS_REMOVE_REQ && value < 0))
value = 0;
ret = pm_qos_update_target(&qos->resume_latency,
&req->data.pnode, action, value);
break;
@@ -189,7 +192,7 @@ static int dev_pm_qos_constraints_allocate(struct device *dev)
plist_head_init(&c->list);
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->no_constraint_value = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
c->type = PM_QOS_MIN;
c->notifiers = n;

2
drivers/base/power/runtime.c
查看文件

@@ -253,7 +253,7 @@ static int rpm_check_suspend_allowed(struct device *dev)
|| (dev->power.request_pending
&& dev->power.request == RPM_REQ_RESUME))
retval = -EAGAIN;
else if (__dev_pm_qos_read_value(dev) < 0)
else if (__dev_pm_qos_read_value(dev) == 0)
retval = -EPERM;
else if (dev->power.runtime_status == RPM_SUSPENDED)
retval = 1;

53
drivers/base/power/sysfs.c
查看文件

@@ -218,7 +218,14 @@ 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_resume_latency(dev));
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)
value = 0;
return sprintf(buf, "%d\n", value);
}
static ssize_t pm_qos_resume_latency_store(struct device *dev,
@@ -228,11 +235,21 @@ static ssize_t pm_qos_resume_latency_store(struct device *dev,
s32 value;
int ret;
if (kstrtos32(buf, 0, &value))
return -EINVAL;
if (!kstrtos32(buf, 0, &value)) {
/*
* Prevent users from writing negative or "no constraint" values
* directly.
*/
if (value < 0 || value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
return -EINVAL;
if (value < 0)
if (value == 0)
value = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
} else if (!strcmp(buf, "n/a") || !strcmp(buf, "n/a\n")) {
value = 0;
} else {
return -EINVAL;
}
ret = dev_pm_qos_update_request(dev->power.qos->resume_latency_req,
value);
@@ -309,33 +326,6 @@ static ssize_t pm_qos_no_power_off_store(struct device *dev,
static DEVICE_ATTR(pm_qos_no_power_off, 0644,
pm_qos_no_power_off_show, pm_qos_no_power_off_store);
static ssize_t pm_qos_remote_wakeup_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev)
& PM_QOS_FLAG_REMOTE_WAKEUP));
}
static ssize_t pm_qos_remote_wakeup_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t n)
{
int ret;
if (kstrtoint(buf, 0, &ret))
return -EINVAL;
if (ret != 0 && ret != 1)
return -EINVAL;
ret = dev_pm_qos_update_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP, ret);
return ret < 0 ? ret : n;
}
static DEVICE_ATTR(pm_qos_remote_wakeup, 0644,
pm_qos_remote_wakeup_show, pm_qos_remote_wakeup_store);
#ifdef CONFIG_PM_SLEEP
static const char _enabled[] = "enabled";
static const char _disabled[] = "disabled";
@@ -671,7 +661,6 @@ static const struct attribute_group pm_qos_latency_tolerance_attr_group = {
static struct attribute *pm_qos_flags_attrs[] = {
&dev_attr_pm_qos_no_power_off.attr,
&dev_attr_pm_qos_remote_wakeup.attr,
NULL,
};
static const struct attribute_group pm_qos_flags_attr_group = {