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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-11-13 03:33:48 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-11-13 03:33:48 +0300
commit4762573b934cced83b91950f0e7a9f160e3983e3 (patch)
tree3ab9a54af2bf2f66776b020eee4f7dbe897912b0 /drivers/base
parent29aaf90875de6a1a760d555f815b18e412b5ab98 (diff)
parent0759e80b84e34a84e7e46e2b1adb528c83d84a47 (diff)
downloadlinux-4762573b934cced83b91950f0e7a9f160e3983e3.tar.xz
Merge branch 'pm-qos'
* pm-qos: PM / QoS: Fix device resume latency framework PM / QoS: Drop PM_QOS_FLAG_REMOTE_WAKEUP
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/cpu.c3
-rw-r--r--drivers/base/power/domain.c6
-rw-r--r--drivers/base/power/domain_governor.c40
-rw-r--r--drivers/base/power/qos.c5
-rw-r--r--drivers/base/power/runtime.c2
-rw-r--r--drivers/base/power/sysfs.c53
6 files changed, 46 insertions, 63 deletions
diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index 321cd7b4d817..227bac5f1191 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -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;
}
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 47fb71a8066a..0c80bea05bcb 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -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);
diff --git a/drivers/base/power/domain_governor.c b/drivers/base/power/domain_governor.c
index e4cca8adab32..99896fbf18e4 100644
--- a/drivers/base/power/domain_governor.c
+++ b/drivers/base/power/domain_governor.c
@@ -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)
diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c
index 277d43a83f53..3382542b39b7 100644
--- a/drivers/base/power/qos.c
+++ b/drivers/base/power/qos.c
@@ -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;
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 7bcf80fa9ada..13e015905543 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -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;
diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c
index 156ab57bca77..e153e28b1857 100644
--- a/drivers/base/power/sysfs.c
+++ b/drivers/base/power/sysfs.c
@@ -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 = {