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authorLinus Torvalds <torvalds@linux-foundation.org>2012-12-11 12:45:35 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-11 12:45:35 -0800
commitbad73c5aa069f1f14cc07ce7bbae8d463635560c (patch)
treedb905bb3400e6fe70be95cd20158bed79b2b2c6c /drivers/base
parentb58ed041a360ed051fab17e4d9b0f451c6fedba7 (diff)
parentf316fc56555a5c3bcf6350f3d5ac26dd2c55f4cb (diff)
Merge tag 'pm+acpi-for-3.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull ACPI and power management updates from Rafael Wysocki: - Introduction of device PM QoS flags. - ACPI device power management update allowing subsystems other than PCI to use it more easily. - ACPI device enumeration rework allowing additional kinds of devices to be enumerated via ACPI. From Mika Westerberg, Adrian Hunter, Mathias Nyman, Andy Shevchenko, and Rafael J. Wysocki. - ACPICA update to version 20121018 from Bob Moore and Lv Zheng. - ACPI memory hotplug update from Wen Congyang and Yasuaki Ishimatsu. - Introduction of acpi_handle_<level>() messaging macros and ACPI-based CPU hot-remove support from Toshi Kani. - ACPI EC updates from Feng Tang. - cpufreq updates from Viresh Kumar, Fabio Baltieri and others. - cpuidle changes to quickly notice governor prediction failure from Youquan Song. - Support for using multiple cpuidle drivers at the same time and cpuidle cleanups from Daniel Lezcano. - devfreq updates from Nishanth Menon and others. - cpupower update from Thomas Renninger. - Fixes and small cleanups all over the place. * tag 'pm+acpi-for-3.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (196 commits) mmc: sdhci-acpi: enable runtime-pm for device HID INT33C6 ACPI: add Haswell LPSS devices to acpi_platform_device_ids list ACPI: add documentation about ACPI 5 enumeration pnpacpi: fix incorrect TEST_ALPHA() test ACPI / PM: Fix header of acpi_dev_pm_detach() in acpi.h ACPI / video: ignore BIOS initial backlight value for HP Folio 13-2000 ACPI : do not use Lid and Sleep button for S5 wakeup ACPI / PNP: Do not crash due to stale pointer use during system resume ACPI / video: Add "Asus UL30VT" to ACPI video detect blacklist ACPI: do acpisleep dmi check when CONFIG_ACPI_SLEEP is set spi / ACPI: add ACPI enumeration support gpio / ACPI: add ACPI support PM / devfreq: remove compiler error with module governors (2) cpupower: IvyBridge (0x3a and 0x3e models) support cpupower: Provide -c param for cpupower monitor to schedule process on all cores cpupower tools: Fix warning and a bug with the cpu package count cpupower tools: Fix malloc of cpu_info structure cpupower tools: Fix issues with sysfs_topology_read_file cpupower tools: Fix minor warnings cpupower tools: Update .gitignore for files created in the debug directories ...
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/core.c2
-rw-r--r--drivers/base/platform.c26
-rw-r--r--drivers/base/power/clock_ops.c6
-rw-r--r--drivers/base/power/domain.c11
-rw-r--r--drivers/base/power/opp.c44
-rw-r--r--drivers/base/power/power.h6
-rw-r--r--drivers/base/power/qos.c321
-rw-r--r--drivers/base/power/sysfs.c94
8 files changed, 414 insertions, 96 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c
index abea76c36a4..150a41580fa 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -1180,7 +1180,6 @@ void device_del(struct device *dev)
if (dev->bus)
blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
BUS_NOTIFY_DEL_DEVICE, dev);
- device_pm_remove(dev);
dpm_sysfs_remove(dev);
if (parent)
klist_del(&dev->p->knode_parent);
@@ -1205,6 +1204,7 @@ void device_del(struct device *dev)
device_remove_file(dev, &uevent_attr);
device_remove_attrs(dev);
bus_remove_device(dev);
+ device_pm_remove(dev);
driver_deferred_probe_del(dev);
/* Notify the platform of the removal, in case they
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 72c776f2a1f..b2ee3bcd5a4 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -21,6 +21,7 @@
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/idr.h>
+#include <linux/acpi.h>
#include "base.h"
#include "power/power.h"
@@ -436,6 +437,7 @@ struct platform_device *platform_device_register_full(
goto err_alloc;
pdev->dev.parent = pdevinfo->parent;
+ ACPI_HANDLE_SET(&pdev->dev, pdevinfo->acpi_node.handle);
if (pdevinfo->dma_mask) {
/*
@@ -466,6 +468,7 @@ struct platform_device *platform_device_register_full(
ret = platform_device_add(pdev);
if (ret) {
err:
+ ACPI_HANDLE_SET(&pdev->dev, NULL);
kfree(pdev->dev.dma_mask);
err_alloc:
@@ -481,8 +484,16 @@ static int platform_drv_probe(struct device *_dev)
{
struct platform_driver *drv = to_platform_driver(_dev->driver);
struct platform_device *dev = to_platform_device(_dev);
+ int ret;
- return drv->probe(dev);
+ if (ACPI_HANDLE(_dev))
+ acpi_dev_pm_attach(_dev, true);
+
+ ret = drv->probe(dev);
+ if (ret && ACPI_HANDLE(_dev))
+ acpi_dev_pm_detach(_dev, true);
+
+ return ret;
}
static int platform_drv_probe_fail(struct device *_dev)
@@ -494,8 +505,13 @@ static int platform_drv_remove(struct device *_dev)
{
struct platform_driver *drv = to_platform_driver(_dev->driver);
struct platform_device *dev = to_platform_device(_dev);
+ int ret;
+
+ ret = drv->remove(dev);
+ if (ACPI_HANDLE(_dev))
+ acpi_dev_pm_detach(_dev, true);
- return drv->remove(dev);
+ return ret;
}
static void platform_drv_shutdown(struct device *_dev)
@@ -504,6 +520,8 @@ static void platform_drv_shutdown(struct device *_dev)
struct platform_device *dev = to_platform_device(_dev);
drv->shutdown(dev);
+ if (ACPI_HANDLE(_dev))
+ acpi_dev_pm_detach(_dev, true);
}
/**
@@ -709,6 +727,10 @@ static int platform_match(struct device *dev, struct device_driver *drv)
if (of_driver_match_device(dev, drv))
return 1;
+ /* Then try ACPI style match */
+ if (acpi_driver_match_device(dev, drv))
+ return 1;
+
/* Then try to match against the id table */
if (pdrv->id_table)
return platform_match_id(pdrv->id_table, pdev) != NULL;
diff --git a/drivers/base/power/clock_ops.c b/drivers/base/power/clock_ops.c
index eb78e9640c4..9d8fde70939 100644
--- a/drivers/base/power/clock_ops.c
+++ b/drivers/base/power/clock_ops.c
@@ -99,7 +99,7 @@ static void __pm_clk_remove(struct pm_clock_entry *ce)
if (ce->status < PCE_STATUS_ERROR) {
if (ce->status == PCE_STATUS_ENABLED)
- clk_disable(ce->clk);
+ clk_disable_unprepare(ce->clk);
if (ce->status >= PCE_STATUS_ACQUIRED)
clk_put(ce->clk);
@@ -396,7 +396,7 @@ static void enable_clock(struct device *dev, const char *con_id)
clk = clk_get(dev, con_id);
if (!IS_ERR(clk)) {
- clk_enable(clk);
+ clk_prepare_enable(clk);
clk_put(clk);
dev_info(dev, "Runtime PM disabled, clock forced on.\n");
}
@@ -413,7 +413,7 @@ static void disable_clock(struct device *dev, const char *con_id)
clk = clk_get(dev, con_id);
if (!IS_ERR(clk)) {
- clk_disable(clk);
+ clk_disable_unprepare(clk);
clk_put(clk);
dev_info(dev, "Runtime PM disabled, clock forced off.\n");
}
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 96b71b6536d..acc3a8ded29 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -470,10 +470,19 @@ static int pm_genpd_poweroff(struct generic_pm_domain *genpd)
return -EBUSY;
not_suspended = 0;
- list_for_each_entry(pdd, &genpd->dev_list, list_node)
+ 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);
+ if (stat > PM_QOS_FLAGS_NONE)
+ return -EBUSY;
+
if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev)
|| pdd->dev->power.irq_safe))
not_suspended++;
+ }
if (not_suspended > genpd->in_progress)
return -EBUSY;
diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c
index d9468642fc4..50b2831e027 100644
--- a/drivers/base/power/opp.c
+++ b/drivers/base/power/opp.c
@@ -23,6 +23,7 @@
#include <linux/rcupdate.h>
#include <linux/opp.h>
#include <linux/of.h>
+#include <linux/export.h>
/*
* Internal data structure organization with the OPP layer library is as
@@ -65,6 +66,7 @@ struct opp {
unsigned long u_volt;
struct device_opp *dev_opp;
+ struct rcu_head head;
};
/**
@@ -160,6 +162,7 @@ unsigned long opp_get_voltage(struct opp *opp)
return v;
}
+EXPORT_SYMBOL(opp_get_voltage);
/**
* opp_get_freq() - Gets the frequency corresponding to an available opp
@@ -189,6 +192,7 @@ unsigned long opp_get_freq(struct opp *opp)
return f;
}
+EXPORT_SYMBOL(opp_get_freq);
/**
* opp_get_opp_count() - Get number of opps available in the opp list
@@ -221,6 +225,7 @@ int opp_get_opp_count(struct device *dev)
return count;
}
+EXPORT_SYMBOL(opp_get_opp_count);
/**
* opp_find_freq_exact() - search for an exact frequency
@@ -230,7 +235,10 @@ int opp_get_opp_count(struct device *dev)
*
* Searches for exact match in the opp list and returns pointer to the matching
* opp if found, else returns ERR_PTR in case of error and should be handled
- * using IS_ERR.
+ * using IS_ERR. Error return values can be:
+ * EINVAL: for bad pointer
+ * ERANGE: no match found for search
+ * ENODEV: if device not found in list of registered devices
*
* Note: available is a modifier for the search. if available=true, then the
* match is for exact matching frequency and is available in the stored OPP
@@ -249,7 +257,7 @@ struct opp *opp_find_freq_exact(struct device *dev, unsigned long freq,
bool available)
{
struct device_opp *dev_opp;
- struct opp *temp_opp, *opp = ERR_PTR(-ENODEV);
+ struct opp *temp_opp, *opp = ERR_PTR(-ERANGE);
dev_opp = find_device_opp(dev);
if (IS_ERR(dev_opp)) {
@@ -268,6 +276,7 @@ struct opp *opp_find_freq_exact(struct device *dev, unsigned long freq,
return opp;
}
+EXPORT_SYMBOL(opp_find_freq_exact);
/**
* opp_find_freq_ceil() - Search for an rounded ceil freq
@@ -278,7 +287,11 @@ struct opp *opp_find_freq_exact(struct device *dev, unsigned long freq,
* for a device.
*
* Returns matching *opp and refreshes *freq accordingly, else returns
- * ERR_PTR in case of error and should be handled using IS_ERR.
+ * ERR_PTR in case of error and should be handled using IS_ERR. Error return
+ * values can be:
+ * EINVAL: for bad pointer
+ * ERANGE: no match found for search
+ * ENODEV: if device not found in list of registered devices
*
* Locking: This function must be called under rcu_read_lock(). opp is a rcu
* protected pointer. The reason for the same is that the opp pointer which is
@@ -289,7 +302,7 @@ struct opp *opp_find_freq_exact(struct device *dev, unsigned long freq,
struct opp *opp_find_freq_ceil(struct device *dev, unsigned long *freq)
{
struct device_opp *dev_opp;
- struct opp *temp_opp, *opp = ERR_PTR(-ENODEV);
+ struct opp *temp_opp, *opp = ERR_PTR(-ERANGE);
if (!dev || !freq) {
dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq);
@@ -298,7 +311,7 @@ struct opp *opp_find_freq_ceil(struct device *dev, unsigned long *freq)
dev_opp = find_device_opp(dev);
if (IS_ERR(dev_opp))
- return opp;
+ return ERR_CAST(dev_opp);
list_for_each_entry_rcu(temp_opp, &dev_opp->opp_list, node) {
if (temp_opp->available && temp_opp->rate >= *freq) {
@@ -310,6 +323,7 @@ struct opp *opp_find_freq_ceil(struct device *dev, unsigned long *freq)
return opp;
}
+EXPORT_SYMBOL(opp_find_freq_ceil);
/**
* opp_find_freq_floor() - Search for a rounded floor freq
@@ -320,7 +334,11 @@ struct opp *opp_find_freq_ceil(struct device *dev, unsigned long *freq)
* for a device.
*
* Returns matching *opp and refreshes *freq accordingly, else returns
- * ERR_PTR in case of error and should be handled using IS_ERR.
+ * ERR_PTR in case of error and should be handled using IS_ERR. Error return
+ * values can be:
+ * EINVAL: for bad pointer
+ * ERANGE: no match found for search
+ * ENODEV: if device not found in list of registered devices
*
* Locking: This function must be called under rcu_read_lock(). opp is a rcu
* protected pointer. The reason for the same is that the opp pointer which is
@@ -331,7 +349,7 @@ struct opp *opp_find_freq_ceil(struct device *dev, unsigned long *freq)
struct opp *opp_find_freq_floor(struct device *dev, unsigned long *freq)
{
struct device_opp *dev_opp;
- struct opp *temp_opp, *opp = ERR_PTR(-ENODEV);
+ struct opp *temp_opp, *opp = ERR_PTR(-ERANGE);
if (!dev || !freq) {
dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq);
@@ -340,7 +358,7 @@ struct opp *opp_find_freq_floor(struct device *dev, unsigned long *freq)
dev_opp = find_device_opp(dev);
if (IS_ERR(dev_opp))
- return opp;
+ return ERR_CAST(dev_opp);
list_for_each_entry_rcu(temp_opp, &dev_opp->opp_list, node) {
if (temp_opp->available) {
@@ -356,6 +374,7 @@ struct opp *opp_find_freq_floor(struct device *dev, unsigned long *freq)
return opp;
}
+EXPORT_SYMBOL(opp_find_freq_floor);
/**
* opp_add() - Add an OPP table from a table definitions
@@ -512,7 +531,7 @@ static int opp_set_availability(struct device *dev, unsigned long freq,
list_replace_rcu(&opp->node, &new_opp->node);
mutex_unlock(&dev_opp_list_lock);
- synchronize_rcu();
+ kfree_rcu(opp, head);
/* Notify the change of the OPP availability */
if (availability_req)
@@ -522,13 +541,10 @@ static int opp_set_availability(struct device *dev, unsigned long freq,
srcu_notifier_call_chain(&dev_opp->head, OPP_EVENT_DISABLE,
new_opp);
- /* clean up old opp */
- new_opp = opp;
- goto out;
+ return 0;
unlock:
mutex_unlock(&dev_opp_list_lock);
-out:
kfree(new_opp);
return r;
}
@@ -552,6 +568,7 @@ int opp_enable(struct device *dev, unsigned long freq)
{
return opp_set_availability(dev, freq, true);
}
+EXPORT_SYMBOL(opp_enable);
/**
* opp_disable() - Disable a specific OPP
@@ -573,6 +590,7 @@ int opp_disable(struct device *dev, unsigned long freq)
{
return opp_set_availability(dev, freq, false);
}
+EXPORT_SYMBOL(opp_disable);
#ifdef CONFIG_CPU_FREQ
/**
diff --git a/drivers/base/power/power.h b/drivers/base/power/power.h
index 0dbfdf4419a..b16686a0a5a 100644
--- a/drivers/base/power/power.h
+++ b/drivers/base/power/power.h
@@ -93,8 +93,10 @@ 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(struct device *dev);
-extern void pm_qos_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_flags(struct device *dev);
+extern void pm_qos_sysfs_remove_flags(struct device *dev);
#else /* CONFIG_PM */
diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c
index fbbd4ed2edf..ff46387f530 100644
--- a/drivers/base/power/qos.c
+++ b/drivers/base/power/qos.c
@@ -40,6 +40,7 @@
#include <linux/device.h>
#include <linux/mutex.h>
#include <linux/export.h>
+#include <linux/pm_runtime.h>
#include "power.h"
@@ -48,6 +49,50 @@ static DEFINE_MUTEX(dev_pm_qos_mtx);
static BLOCKING_NOTIFIER_HEAD(dev_pm_notifiers);
/**
+ * __dev_pm_qos_flags - Check PM QoS flags for a given device.
+ * @dev: Device to check the PM QoS flags for.
+ * @mask: Flags to check against.
+ *
+ * This routine must be called with dev->power.lock held.
+ */
+enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev, s32 mask)
+{
+ struct dev_pm_qos *qos = dev->power.qos;
+ struct pm_qos_flags *pqf;
+ s32 val;
+
+ if (!qos)
+ return PM_QOS_FLAGS_UNDEFINED;
+
+ pqf = &qos->flags;
+ if (list_empty(&pqf->list))
+ return PM_QOS_FLAGS_UNDEFINED;
+
+ val = pqf->effective_flags & mask;
+ if (val)
+ return (val == mask) ? PM_QOS_FLAGS_ALL : PM_QOS_FLAGS_SOME;
+
+ return PM_QOS_FLAGS_NONE;
+}
+
+/**
+ * dev_pm_qos_flags - Check PM QoS flags for a given device (locked).
+ * @dev: Device to check the PM QoS flags for.
+ * @mask: Flags to check against.
+ */
+enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev, s32 mask)
+{
+ unsigned long irqflags;
+ enum pm_qos_flags_status ret;
+
+ spin_lock_irqsave(&dev->power.lock, irqflags);
+ ret = __dev_pm_qos_flags(dev, mask);
+ spin_unlock_irqrestore(&dev->power.lock, irqflags);
+
+ return ret;
+}
+
+/**
* __dev_pm_qos_read_value - Get PM QoS constraint for a given device.
* @dev: Device to get the PM QoS constraint value for.
*
@@ -55,9 +100,7 @@ static BLOCKING_NOTIFIER_HEAD(dev_pm_notifiers);
*/
s32 __dev_pm_qos_read_value(struct device *dev)
{
- struct pm_qos_constraints *c = dev->power.constraints;
-
- return c ? pm_qos_read_value(c) : 0;
+ return dev->power.qos ? pm_qos_read_value(&dev->power.qos->latency) : 0;
}
/**
@@ -76,30 +119,39 @@ s32 dev_pm_qos_read_value(struct device *dev)
return ret;
}
-/*
- * apply_constraint
- * @req: constraint request to apply
- * @action: action to perform add/update/remove, of type enum pm_qos_req_action
- * @value: defines the qos request
+/**
+ * apply_constraint - Add/modify/remove device PM QoS request.
+ * @req: Constraint request to apply
+ * @action: Action to perform (add/update/remove).
+ * @value: Value to assign to the QoS request.
*
* Internal function to update the constraints list using the PM QoS core
* code and if needed call the per-device and the global notification
* callbacks
*/
static int apply_constraint(struct dev_pm_qos_request *req,
- enum pm_qos_req_action action, int value)
+ enum pm_qos_req_action action, s32 value)
{
- int ret, curr_value;
-
- ret = pm_qos_update_target(req->dev->power.constraints,
- &req->node, action, value);
+ struct dev_pm_qos *qos = req->dev->power.qos;
+ int ret;
- if (ret) {
- /* Call the global callbacks if needed */
- curr_value = pm_qos_read_value(req->dev->power.constraints);
- blocking_notifier_call_chain(&dev_pm_notifiers,
- (unsigned long)curr_value,
- req);
+ switch(req->type) {
+ case DEV_PM_QOS_LATENCY:
+ ret = pm_qos_update_target(&qos->latency, &req->data.pnode,
+ action, value);
+ if (ret) {
+ value = pm_qos_read_value(&qos->latency);
+ blocking_notifier_call_chain(&dev_pm_notifiers,
+ (unsigned long)value,
+ req);
+ }
+ break;
+ case DEV_PM_QOS_FLAGS:
+ ret = pm_qos_update_flags(&qos->flags, &req->data.flr,
+ action, value);
+ break;
+ default:
+ ret = -EINVAL;
}
return ret;
@@ -114,28 +166,32 @@ static int apply_constraint(struct dev_pm_qos_request *req,
*/
static int dev_pm_qos_constraints_allocate(struct device *dev)
{
+ struct dev_pm_qos *qos;
struct pm_qos_constraints *c;
struct blocking_notifier_head *n;
- c = kzalloc(sizeof(*c), GFP_KERNEL);
- if (!c)
+ qos = kzalloc(sizeof(*qos), GFP_KERNEL);
+ if (!qos)
return -ENOMEM;
n = kzalloc(sizeof(*n), GFP_KERNEL);
if (!n) {
- kfree(c);
+ kfree(qos);
return -ENOMEM;
}
BLOCKING_INIT_NOTIFIER_HEAD(n);
+ c = &qos->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->type = PM_QOS_MIN;
c->notifiers = n;
+ INIT_LIST_HEAD(&qos->flags.list);
+
spin_lock_irq(&dev->power.lock);
- dev->power.constraints = c;
+ dev->power.qos = qos;
spin_unlock_irq(&dev->power.lock);
return 0;
@@ -151,7 +207,7 @@ static int dev_pm_qos_constraints_allocate(struct device *dev)
void dev_pm_qos_constraints_init(struct device *dev)
{
mutex_lock(&dev_pm_qos_mtx);
- dev->power.constraints = NULL;
+ dev->power.qos = NULL;
dev->power.power_state = PMSG_ON;
mutex_unlock(&dev_pm_qos_mtx);
}
@@ -164,24 +220,28 @@ void dev_pm_qos_constraints_init(struct device *dev)
*/
void dev_pm_qos_constraints_destroy(struct device *dev)
{
+ struct dev_pm_qos *qos;
struct dev_pm_qos_request *req, *tmp;
struct pm_qos_constraints *c;
+ struct pm_qos_flags *f;
/*
- * If the device's PM QoS resume latency limit has been exposed to user
- * space, it has to be hidden at this point.
+ * 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.
*/
dev_pm_qos_hide_latency_limit(dev);
+ dev_pm_qos_hide_flags(dev);
mutex_lock(&dev_pm_qos_mtx);
dev->power.power_state = PMSG_INVALID;
- c = dev->power.constraints;
- if (!c)
+ qos = dev->power.qos;
+ if (!qos)
goto out;
- /* Flush the constraints list for the device */
- plist_for_each_entry_safe(req, tmp, &c->list, node) {
+ /* Flush the constraints lists for the device. */
+ c = &qos->latency;
+ plist_for_each_entry_safe(req, tmp, &c->list, data.pnode) {
/*
* Update constraints list and call the notification
* callbacks if needed
@@ -189,13 +249,18 @@ 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));
}
+ 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);
+ memset(req, 0, sizeof(*req));
+ }
spin_lock_irq(&dev->power.lock);
- dev->power.constraints = NULL;
+ dev->power.qos = NULL;
spin_unlock_irq(&dev->power.lock);
kfree(c->notifiers);
- kfree(c);
+ kfree(qos);
out:
mutex_unlock(&dev_pm_qos_mtx);
@@ -205,6 +270,7 @@ void dev_pm_qos_constraints_destroy(struct device *dev)
* dev_pm_qos_add_request - inserts new qos request into the list
* @dev: target device for the constraint
* @req: pointer to a preallocated handle
+ * @type: type of the request
* @value: defines the qos request
*
* This function inserts a new entry in the device constraints list of
@@ -218,9 +284,12 @@ void dev_pm_qos_constraints_destroy(struct device *dev)
* -EINVAL in case of wrong parameters, -ENOMEM if there's not enough memory
* to allocate for data structures, -ENODEV if the device has just been removed
* from the system.
+ *
+ * Callers should ensure that the target device is not RPM_SUSPENDED before
+ * using this function for requests of type DEV_PM_QOS_FLAGS.
*/
int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
- s32 value)
+ enum dev_pm_qos_req_type type, s32 value)
{
int ret = 0;
@@ -235,7 +304,7 @@ int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
mutex_lock(&dev_pm_qos_mtx);
- if (!dev->power.constraints) {
+ if (!dev->power.qos) {
if (dev->power.power_state.event == PM_EVENT_INVALID) {
/* The device has been removed from the system. */
req->dev = NULL;
@@ -251,8 +320,10 @@ int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
}
}
- if (!ret)
+ if (!ret) {
+ req->type = type;
ret = apply_constraint(req, PM_QOS_ADD_REQ, value);
+ }
out:
mutex_unlock(&dev_pm_qos_mtx);
@@ -262,6 +333,37 @@ int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
EXPORT_SYMBOL_GPL(dev_pm_qos_add_request);
/**
+ * __dev_pm_qos_update_request - Modify an existing device PM QoS request.
+ * @req : PM QoS request to modify.
+ * @new_value: New value to request.
+ */
+static int __dev_pm_qos_update_request(struct dev_pm_qos_request *req,
+ s32 new_value)
+{
+ s32 curr_value;
+ int ret = 0;
+
+ if (!req->dev->power.qos)
+ return -ENODEV;
+
+ switch(req->type) {
+ case DEV_PM_QOS_LATENCY:
+ curr_value = req->data.pnode.prio;
+ break;
+ case DEV_PM_QOS_FLAGS:
+ curr_value = req->data.flr.flags;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (curr_value != new_value)
+ ret = apply_constraint(req, PM_QOS_UPDATE_REQ, new_value);
+
+ return ret;
+}
+
+/**
* dev_pm_qos_update_request - modifies an existing qos request
* @req : handle to list element holding a dev_pm_qos request to use
* @new_value: defines the qos request
@@ -275,11 +377,13 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_add_request);
* 0 if the aggregated constraint value has not changed,
* -EINVAL in case of wrong parameters, -ENODEV if the device has been
* removed from the system
+ *
+ * Callers should ensure that the target device is not RPM_SUSPENDED before
+ * using this function for requests of type DEV_PM_QOS_FLAGS.
*/
-int dev_pm_qos_update_request(struct dev_pm_qos_request *req,
- s32 new_value)
+int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value)
{
- int ret = 0;
+ int ret;
if (!req) /*guard against callers passing in null */
return -EINVAL;
@@ -289,17 +393,9 @@ int dev_pm_qos_update_request(struct dev_pm_qos_request *req,
return -EINVAL;
mutex_lock(&dev_pm_qos_mtx);
-
- if (req->dev->power.constraints) {
- if (new_value != req->node.prio)
- ret = apply_constraint(req, PM_QOS_UPDATE_REQ,
- new_value);
- } else {
- /* Return if the device has been removed */
- ret = -ENODEV;
- }
-
+ ret = __dev_pm_qos_update_request(req, new_value);
mutex_unlock(&dev_pm_qos_mtx);
+
return ret;
}
EXPORT_SYMBOL_GPL(dev_pm_qos_update_request);
@@ -315,6 +411,9 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_update_request);
* 0 if the aggregated constraint value has not changed,
* -EINVAL in case of wrong parameters, -ENODEV if the device has been
* removed from the system
+ *
+ * Callers should ensure that the target device is not RPM_SUSPENDED before
+ * using this function for requests of type DEV_PM_QOS_FLAGS.
*/
int dev_pm_qos_remove_request(struct dev_pm_qos_request *req)
{
@@ -329,7 +428,7 @@ int dev_pm_qos_remove_request(struct dev_pm_qos_request *req)
mutex_lock(&dev_pm_qos_mtx);
- if (req->dev->power.constraints) {
+ if (req->dev->power.qos) {
ret = apply_constraint(req, PM_QOS_REMOVE_REQ,
PM_QOS_DEFAULT_VALUE);
memset(req, 0, sizeof(*req));
@@ -362,13 +461,13 @@ int dev_pm_qos_add_notifier(struct device *dev, struct notifier_block *notifier)
mutex_lock(&dev_pm_qos_mtx);
- if (!dev->power.constraints)
+ if (!dev->power.qos)
ret = dev->power.power_state.event != PM_EVENT_INVALID ?
dev_pm_qos_constraints_allocate(dev) : -ENODEV;
if (!ret)
ret = blocking_notifier_chain_register(
- dev->power.constraints->notifiers, notifier);
+ dev->power.qos->latency.notifiers, notifier);
mutex_unlock(&dev_pm_qos_mtx);
return ret;
@@ -393,9 +492,9 @@ int dev_pm_qos_remove_notifier(struct device *dev,
mutex_lock(&dev_pm_qos_mtx);
/* Silently return if the constraints object is not present. */
- if (dev->power.constraints)
+ if (dev->power.qos)
retval = blocking_notifier_chain_unregister(
- dev->power.constraints->notifiers,
+ dev->power.qos->latency.notifiers,
notifier);
mutex_unlock(&dev_pm_qos_mtx);
@@ -449,7 +548,8 @@ int dev_pm_qos_add_ancestor_request(struct device *dev,
ancestor = ancestor->parent;
if (ancestor)
- error = dev_pm_qos_add_request(ancestor, req, value);
+ error = dev_pm_qos_add_request(ancestor, req,
+ DEV_PM_QOS_LATENCY, value);
if (error < 0)
req->dev = NULL;
@@ -459,10 +559,19 @@ int dev_pm_qos_add_ancestor_request(struct device *dev,
EXPORT_SYMBOL_GPL(dev_pm_qos_add_ancestor_request);
#ifdef CONFIG_PM_RUNTIME
-static void __dev_pm_qos_drop_user_request(struct device *dev)
+static void __dev_pm_qos_drop_user_request(struct device *dev,
+ enum dev_pm_qos_req_type type)
{
- dev_pm_qos_remove_request(dev->power.pq_req);
- dev->power.pq_req = NULL;
+ switch(type) {
+ case DEV_PM_QOS_LATENCY:
+ dev_pm_qos_remove_request(dev->power.qos->latency_req);
+ dev->power.qos->latency_req = NULL;
+ break;
+ case DEV_PM_QOS_FLAGS:
+ dev_pm_qos_remove_request(dev->power.qos->flags_req);
+ dev->power.qos->flags_req = NULL;
+ break;
+ }
}
/**
@@ -478,21 +587,21 @@ int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
if (!device_is_registered(dev) || value < 0)
return -EINVAL;
- if (dev->power.pq_req)
+ if (dev->power.qos && dev->power.qos->latency_req)
return -EEXIST;
req = kzalloc(sizeof(*req), GFP_KERNEL);
if (!req)
return -ENOMEM;
- ret = dev_pm_qos_add_request(dev, req, value);
+ ret = dev_pm_qos_add_request(dev, req, DEV_PM_QOS_LATENCY, value);
if (ret < 0)
return ret;
- dev->power.pq_req = req;
- ret = pm_qos_sysfs_add(dev);
+ dev->power.qos->latency_req = req;
+ ret = pm_qos_sysfs_add_latency(dev);
if (ret)
- __dev_pm_qos_drop_user_request(dev);
+ __dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_LATENCY);
return ret;
}
@@ -504,10 +613,92 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_expose_latency_limit);
*/
void dev_pm_qos_hide_latency_limit(struct device *dev)
{
- if (dev->power.pq_req) {
- pm_qos_sysfs_remove(dev);
- __dev_pm_qos_drop_user_request(dev);
+ if (dev->power.qos && dev->power.qos->latency_req) {
+ pm_qos_sysfs_remove_latency(dev);
+ __dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_LATENCY);
}
}
EXPORT_SYMBOL_GPL(dev_pm_qos_hide_latency_limit);
+
+/**
+ * dev_pm_qos_expose_flags - Expose PM QoS flags of a device to user space.
+ * @dev: Device whose PM QoS flags are to be exposed to user space.
+ * @val: Initial values of the flags.
+ */
+int dev_pm_qos_expose_flags(struct device *dev, s32 val)
+{
+ struct dev_pm_qos_request *req;
+ int ret;
+
+ if (!device_is_registered(dev))
+ return -EINVAL;
+
+ if (dev->power.qos && dev->power.qos->flags_req)
+ return -EEXIST;
+
+ req = kzalloc(sizeof(*req), GFP_KERNEL);
+ if (!req)
+ return -ENOMEM;
+
+ pm_runtime_get_sync(dev);
+ ret = dev_pm_qos_add_request(dev, req, DEV_PM_QOS_FLAGS, val);
+ if (ret < 0)
+ goto fail;
+
+ dev->power.qos->flags_req = req;
+ ret = pm_qos_sysfs_add_flags(dev);
+ if (ret)
+ __dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_FLAGS);
+
+fail:
+ pm_runtime_put(dev);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(dev_pm_qos_expose_flags);
+
+/**
+ * dev_pm_qos_hide_flags - Hide PM QoS flags of a device from user space.
+ * @dev: Device whose PM QoS flags are to be hidden from user space.
+ */
+void dev_pm_qos_hide_flags(struct device *dev)
+{
+ if (dev->power.qos && dev->power.qos->flags_req) {
+ pm_qos_sysfs_remove_flags(dev);
+ pm_runtime_get_sync(dev);
+ __dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_FLAGS);
+ pm_runtime_put(dev);
+ }
+}
+EXPORT_SYMBOL_GPL(dev_pm_qos_hide_flags);
+
+/**
+ * dev_pm_qos_update_flags - Update PM QoS flags request owned by user space.
+ * @dev: Device to update the PM QoS flags request for.
+ * @mask: Flags to set/clear.
+ * @set: Whether to set or clear the flags (true means set).
+ */
+int dev_pm_qos_update_flags(struct device *dev, s32 mask, bool set)
+{
+ s32 value;
+ int ret;
+
+ if (!dev->power.qos || !dev->power.qos->flags_req)
+ return -EINVAL;
+
+ pm_runtime_get_sync(dev);
+ mutex_lock(&dev_pm_qos_mtx);
+
+ value = dev_pm_qos_requested_flags(dev);
+ if (set)
+ value |= mask;
+ else
+ value &= ~mask;
+
+ ret = __dev_pm_qos_update_request(dev->power.qos->flags_req, value);
+
+ mutex_unlock(&dev_pm_qos_mtx);
+ pm_runtime_put(dev);
+
+ return ret;
+}
#endif /* CONFIG_PM_RUNTIME */
diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c
index b91dc6f1e91..50d16e3cb0a 100644
--- a/drivers/base/power/sysfs.c
+++ b/drivers/base/power/sysfs.c
@@ -221,7 +221,7 @@ static DEVICE_ATTR(autosuspend_delay_ms, 0644, autosuspend_delay_ms_show,
static ssize_t pm_qos_latency_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
- return sprintf(buf, "%d\n", dev->power.pq_req->node.prio);
+ return sprintf(buf, "%d\n", dev_pm_qos_requested_latency(dev));
}
static ssize_t pm_qos_latency_store(struct device *dev,
@@ -237,12 +237,66 @@ static ssize_t pm_qos_latency_store(struct device *dev,
if (value < 0)
return -EINVAL;
- ret = dev_pm_qos_update_request(dev->power.pq_req, value);
+ ret = dev_pm_qos_update_request(dev->power.qos->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);
+
+static ssize_t pm_qos_no_power_off_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev)
+ & PM_QOS_FLAG_NO_POWER_OFF));
+}
+
+static ssize_t pm_qos_no_power_off_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_NO_POWER_OFF, ret);
+ 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 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);
#endif /* CONFIG_PM_RUNTIME */
#ifdef CONFIG_PM_SLEEP
@@ -564,15 +618,27 @@ static struct attribute_group pm_runtime_attr_group = {
.attrs = runtime_attrs,
};
-static struct attribute *pm_qos_attrs[] = {
+static struct attribute *pm_qos_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_attr_group = {
+static struct attribute_group pm_qos_latency_attr_group = {
.name = power_group_name,
- .attrs = pm_qos_attrs,
+ .attrs = pm_qos_latency_attrs,
+};
+
+static struct attribute *pm_qos_flags_attrs[] = {
+#ifdef CONFIG_PM_RUNTIME
+ &dev_attr_pm_qos_no_power_off.attr,
+ &dev_attr_pm_qos_remote_wakeup.attr,
+#endif /* CONFIG_PM_RUNTIME */
+ NULL,
+};
+static struct attribute_group pm_qos_flags_attr_group = {
+ .name = power_group_name,
+ .attrs = pm_qos_flags_attrs,
};
int dpm_sysfs_add(struct device *dev)
@@ -615,14 +681,24 @@ void wakeup_sysfs_remove(struct device *dev)
sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
}
-int pm_qos_sysfs_add(struct device *dev)
+int pm_qos_sysfs_add_latency(struct device *dev)
+{
+ return sysfs_merge_group(&dev->kobj, &pm_qos_latency_attr_group);
+}
+
+void pm_qos_sysfs_remove_latency(struct device *dev)
+{
+ sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_attr_group);
+}
+
+int pm_qos_sysfs_add_flags(struct device *dev)
{
- return sysfs_merge_group(&dev->kobj, &pm_qos_attr_group);
+ return sysfs_merge_group(&dev->kobj, &pm_qos_flags_attr_group);
}
-void pm_qos_sysfs_remove(struct device *dev)
+void pm_qos_sysfs_remove_flags(struct device *dev)
{
- sysfs_unmerge_group(&dev->kobj, &pm_qos_attr_group);
+ sysfs_unmerge_group(&dev->kobj, &pm_qos_flags_attr_group);
}
void rpm_sysfs_remove(struct device *dev)