This reverts commit
0cc2b4e5a020 (PM / QoS: Fix device resume latency PM
QoS) as it introduced regressions on multiple systems and the fix-up
in commit
2a9a86d5c813 (PM / QoS: Fix default runtime_pm device resume
latency) does not address all of them.
The original problem that commit
0cc2b4e5a020 was attempting to fix
will be addressed later.
Fixes: 0cc2b4e5a020 (PM / QoS: Fix device resume latency PM QoS)
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
device, after it has been suspended at run time, from a resume
request to the moment the device will be ready to process I/O,
in microseconds. If it is equal to 0, however, this means that
device, after it has been suspended at run time, from a resume
request to the moment the device will be ready to process I/O,
in microseconds. If it is equal to 0, however, this means that
- the PM QoS resume latency may be arbitrary and the special value
- "n/a" means that user space cannot accept any resume latency at
- all for the given device.
+ the PM QoS resume latency may be arbitrary.
Not all drivers support this attribute. If it isn't supported,
it is not present.
Not all drivers support this attribute. If it isn't supported,
it is not present.
per_cpu(cpu_sys_devices, num) = &cpu->dev;
register_cpu_under_node(num, cpu_to_node(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,
- PM_QOS_RESUME_LATENCY_NO_CONSTRAINT);
+ dev_pm_qos_expose_latency_limit(&cpu->dev, 0);
static int dev_update_qos_constraint(struct device *dev, void *data)
{
s64 *constraint_ns_p = data;
static int dev_update_qos_constraint(struct device *dev, void *data)
{
s64 *constraint_ns_p = data;
- s64 constraint_ns = -1;
+ s32 constraint_ns = -1;
if (dev->power.subsys_data && dev->power.subsys_data->domain_data)
constraint_ns = dev_gpd_data(dev)->td.effective_constraint_ns;
if (dev->power.subsys_data && dev->power.subsys_data->domain_data)
constraint_ns = dev_gpd_data(dev)->td.effective_constraint_ns;
+ if (constraint_ns < 0) {
constraint_ns = dev_pm_qos_read_value(dev);
constraint_ns = dev_pm_qos_read_value(dev);
-
- if (constraint_ns == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
+ constraint_ns *= NSEC_PER_USEC;
+ }
+ if (constraint_ns == 0)
- constraint_ns *= NSEC_PER_USEC;
-
- if (constraint_ns < *constraint_ns_p || *constraint_ns_p < 0)
+ /*
+ * constraint_ns cannot be negative here, because the device has been
+ * suspended.
+ */
+ if (constraint_ns < *constraint_ns_p || *constraint_ns_p == 0)
*constraint_ns_p = constraint_ns;
return 0;
*constraint_ns_p = constraint_ns;
return 0;
spin_unlock_irqrestore(&dev->power.lock, flags);
spin_unlock_irqrestore(&dev->power.lock, flags);
- if (constraint_ns == 0)
- if (constraint_ns == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
- constraint_ns = -1;
- else
- constraint_ns *= NSEC_PER_USEC;
-
+ constraint_ns *= NSEC_PER_USEC;
/*
* We can walk the children without any additional locking, because
* they all have been suspended at this point and their
/*
* We can walk the children without any additional locking, because
* they all have been suspended at this point and their
device_for_each_child(dev, &constraint_ns,
dev_update_qos_constraint);
device_for_each_child(dev, &constraint_ns,
dev_update_qos_constraint);
- if (constraint_ns < 0) {
- /* The children have no constraints. */
- td->effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
- td->cached_suspend_ok = true;
- } else {
- constraint_ns -= td->suspend_latency_ns + td->resume_latency_ns;
- if (constraint_ns > 0) {
- td->effective_constraint_ns = constraint_ns;
- td->cached_suspend_ok = true;
- } else {
- td->effective_constraint_ns = 0;
- }
+ if (constraint_ns > 0) {
+ constraint_ns -= td->suspend_latency_ns +
+ td->resume_latency_ns;
+ if (constraint_ns == 0)
+ return false;
+ td->effective_constraint_ns = constraint_ns;
+ td->cached_suspend_ok = constraint_ns >= 0;
/*
* The children have been suspended already, so we don't need to take
/*
* The children have been suspended already, so we don't need to take
td = &to_gpd_data(pdd)->td;
constraint_ns = td->effective_constraint_ns;
/* default_suspend_ok() need not be called before us. */
td = &to_gpd_data(pdd)->td;
constraint_ns = td->effective_constraint_ns;
/* default_suspend_ok() need not be called before us. */
+ if (constraint_ns < 0) {
constraint_ns = dev_pm_qos_read_value(pdd->dev);
constraint_ns = dev_pm_qos_read_value(pdd->dev);
-
- if (constraint_ns == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
+ constraint_ns *= NSEC_PER_USEC;
+ }
+ if (constraint_ns == 0)
- constraint_ns *= NSEC_PER_USEC;
-
/*
* constraint_ns cannot be negative here, because the device has
* been suspended.
/*
* constraint_ns cannot be negative here, because the device has
* been suspended.
plist_head_init(&c->list);
c->target_value = PM_QOS_RESUME_LATENCY_DEFAULT_VALUE;
c->default_value = PM_QOS_RESUME_LATENCY_DEFAULT_VALUE;
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_NO_CONSTRAINT;
+ c->no_constraint_value = PM_QOS_RESUME_LATENCY_DEFAULT_VALUE;
c->type = PM_QOS_MIN;
c->notifiers = n;
c->type = PM_QOS_MIN;
c->notifiers = n;
|| (dev->power.request_pending
&& dev->power.request == RPM_REQ_RESUME))
retval = -EAGAIN;
|| (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;
retval = -EPERM;
else if (dev->power.runtime_status == RPM_SUSPENDED)
retval = 1;
struct device_attribute *attr,
char *buf)
{
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)
- value = 0;
-
- return sprintf(buf, "%d\n", value);
+ return sprintf(buf, "%d\n", dev_pm_qos_requested_resume_latency(dev));
}
static ssize_t pm_qos_resume_latency_store(struct device *dev,
}
static ssize_t pm_qos_resume_latency_store(struct device *dev,
- 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 (kstrtos32(buf, 0, &value))
+ return -EINVAL;
- if (value == 0)
- value = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
- } else if (!strcmp(buf, "n/a") || !strcmp(buf, "n/a\n")) {
- value = 0;
- } else {
ret = dev_pm_qos_update_request(dev->power.qos->resume_latency_req,
value);
ret = dev_pm_qos_update_request(dev->power.qos->resume_latency_req,
value);
data->needs_update = 0;
}
data->needs_update = 0;
}
- if (resume_latency < latency_req &&
- resume_latency != PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
+ /* resume_latency is 0 means no restriction */
+ if (resume_latency && resume_latency < latency_req)
latency_req = resume_latency;
/* Special case when user has set very strict latency requirement */
latency_req = resume_latency;
/* Special case when user has set very strict latency requirement */
-#define PM_QOS_DEFAULT_VALUE (-1)
-#define PM_QOS_LATENCY_ANY S32_MAX
+#define PM_QOS_DEFAULT_VALUE -1
#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_MEMORY_BANDWIDTH_DEFAULT_VALUE 0
#define PM_QOS_RESUME_LATENCY_DEFAULT_VALUE 0
#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_MEMORY_BANDWIDTH_DEFAULT_VALUE 0
#define PM_QOS_RESUME_LATENCY_DEFAULT_VALUE 0
-#define PM_QOS_RESUME_LATENCY_NO_CONSTRAINT PM_QOS_LATENCY_ANY
#define PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE 0
#define PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT (-1)
#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)
#define PM_QOS_FLAG_NO_POWER_OFF (1 << 0)
#define PM_QOS_FLAG_REMOTE_WAKEUP (1 << 1)