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982 lines
26 KiB
982 lines
26 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Devices PM QoS constraints management |
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* |
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* Copyright (C) 2011 Texas Instruments, Inc. |
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* |
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* This module exposes the interface to kernel space for specifying |
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* per-device PM QoS dependencies. It provides infrastructure for registration |
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* of: |
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* |
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* Dependents on a QoS value : register requests |
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* Watchers of QoS value : get notified when target QoS value changes |
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* |
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* This QoS design is best effort based. Dependents register their QoS needs. |
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* Watchers register to keep track of the current QoS needs of the system. |
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* Watchers can register a per-device notification callback using the |
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* dev_pm_qos_*_notifier API. The notification chain data is stored in the |
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* per-device constraint data struct. |
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* |
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* Note about the per-device constraint data struct allocation: |
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* . The per-device constraints data struct ptr is stored into the device |
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* dev_pm_info. |
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* . To minimize the data usage by the per-device constraints, the data struct |
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* is only allocated at the first call to dev_pm_qos_add_request. |
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* . The data is later free'd when the device is removed from the system. |
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* . A global mutex protects the constraints users from the data being |
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* allocated and free'd. |
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*/ |
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|
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#include <linux/pm_qos.h> |
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#include <linux/spinlock.h> |
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#include <linux/slab.h> |
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#include <linux/device.h> |
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#include <linux/mutex.h> |
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#include <linux/export.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/err.h> |
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#include <trace/events/power.h> |
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#include "power.h" |
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|
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static DEFINE_MUTEX(dev_pm_qos_mtx); |
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static DEFINE_MUTEX(dev_pm_qos_sysfs_mtx); |
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|
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/** |
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* __dev_pm_qos_flags - Check PM QoS flags for a given device. |
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* @dev: Device to check the PM QoS flags for. |
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* @mask: Flags to check against. |
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* |
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* This routine must be called with dev->power.lock held. |
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*/ |
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enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev, s32 mask) |
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{ |
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struct dev_pm_qos *qos = dev->power.qos; |
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struct pm_qos_flags *pqf; |
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s32 val; |
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lockdep_assert_held(&dev->power.lock); |
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if (IS_ERR_OR_NULL(qos)) |
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return PM_QOS_FLAGS_UNDEFINED; |
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pqf = &qos->flags; |
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if (list_empty(&pqf->list)) |
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return PM_QOS_FLAGS_UNDEFINED; |
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val = pqf->effective_flags & mask; |
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if (val) |
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return (val == mask) ? PM_QOS_FLAGS_ALL : PM_QOS_FLAGS_SOME; |
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|
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return PM_QOS_FLAGS_NONE; |
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} |
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|
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/** |
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* dev_pm_qos_flags - Check PM QoS flags for a given device (locked). |
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* @dev: Device to check the PM QoS flags for. |
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* @mask: Flags to check against. |
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*/ |
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enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev, s32 mask) |
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{ |
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unsigned long irqflags; |
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enum pm_qos_flags_status ret; |
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|
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spin_lock_irqsave(&dev->power.lock, irqflags); |
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ret = __dev_pm_qos_flags(dev, mask); |
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spin_unlock_irqrestore(&dev->power.lock, irqflags); |
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|
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(dev_pm_qos_flags); |
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|
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/** |
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* __dev_pm_qos_resume_latency - Get resume latency constraint for a given device. |
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* @dev: Device to get the PM QoS constraint value for. |
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* |
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* This routine must be called with dev->power.lock held. |
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*/ |
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s32 __dev_pm_qos_resume_latency(struct device *dev) |
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{ |
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lockdep_assert_held(&dev->power.lock); |
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|
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return dev_pm_qos_raw_resume_latency(dev); |
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} |
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|
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/** |
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* dev_pm_qos_read_value - Get PM QoS constraint for a given device (locked). |
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* @dev: Device to get the PM QoS constraint value for. |
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* @type: QoS request type. |
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*/ |
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s32 dev_pm_qos_read_value(struct device *dev, enum dev_pm_qos_req_type type) |
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{ |
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struct dev_pm_qos *qos = dev->power.qos; |
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unsigned long flags; |
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s32 ret; |
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|
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spin_lock_irqsave(&dev->power.lock, flags); |
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|
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switch (type) { |
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case DEV_PM_QOS_RESUME_LATENCY: |
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ret = IS_ERR_OR_NULL(qos) ? PM_QOS_RESUME_LATENCY_NO_CONSTRAINT |
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: pm_qos_read_value(&qos->resume_latency); |
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break; |
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case DEV_PM_QOS_MIN_FREQUENCY: |
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ret = IS_ERR_OR_NULL(qos) ? PM_QOS_MIN_FREQUENCY_DEFAULT_VALUE |
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: freq_qos_read_value(&qos->freq, FREQ_QOS_MIN); |
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break; |
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case DEV_PM_QOS_MAX_FREQUENCY: |
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ret = IS_ERR_OR_NULL(qos) ? PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE |
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: freq_qos_read_value(&qos->freq, FREQ_QOS_MAX); |
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break; |
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default: |
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WARN_ON(1); |
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ret = 0; |
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} |
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|
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spin_unlock_irqrestore(&dev->power.lock, flags); |
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|
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return ret; |
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} |
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|
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/** |
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* apply_constraint - Add/modify/remove device PM QoS request. |
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* @req: Constraint request to apply |
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* @action: Action to perform (add/update/remove). |
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* @value: Value to assign to the QoS request. |
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* |
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* Internal function to update the constraints list using the PM QoS core |
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* code and if needed call the per-device callbacks. |
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*/ |
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static int apply_constraint(struct dev_pm_qos_request *req, |
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enum pm_qos_req_action action, s32 value) |
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{ |
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struct dev_pm_qos *qos = req->dev->power.qos; |
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int ret; |
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|
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switch(req->type) { |
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case DEV_PM_QOS_RESUME_LATENCY: |
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if (WARN_ON(action != PM_QOS_REMOVE_REQ && value < 0)) |
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value = 0; |
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|
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ret = pm_qos_update_target(&qos->resume_latency, |
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&req->data.pnode, action, value); |
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break; |
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case DEV_PM_QOS_LATENCY_TOLERANCE: |
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ret = pm_qos_update_target(&qos->latency_tolerance, |
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&req->data.pnode, action, value); |
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if (ret) { |
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value = pm_qos_read_value(&qos->latency_tolerance); |
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req->dev->power.set_latency_tolerance(req->dev, value); |
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} |
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break; |
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case DEV_PM_QOS_MIN_FREQUENCY: |
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case DEV_PM_QOS_MAX_FREQUENCY: |
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ret = freq_qos_apply(&req->data.freq, action, value); |
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break; |
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case DEV_PM_QOS_FLAGS: |
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ret = pm_qos_update_flags(&qos->flags, &req->data.flr, |
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action, value); |
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break; |
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default: |
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ret = -EINVAL; |
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} |
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|
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return ret; |
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} |
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|
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/* |
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* dev_pm_qos_constraints_allocate |
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* @dev: device to allocate data for |
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* |
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* Called at the first call to add_request, for constraint data allocation |
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* Must be called with the dev_pm_qos_mtx mutex held |
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*/ |
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static int dev_pm_qos_constraints_allocate(struct device *dev) |
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{ |
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struct dev_pm_qos *qos; |
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struct pm_qos_constraints *c; |
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struct blocking_notifier_head *n; |
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qos = kzalloc(sizeof(*qos), GFP_KERNEL); |
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if (!qos) |
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return -ENOMEM; |
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n = kzalloc(3 * sizeof(*n), GFP_KERNEL); |
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if (!n) { |
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kfree(qos); |
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return -ENOMEM; |
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} |
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c = &qos->resume_latency; |
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plist_head_init(&c->list); |
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c->target_value = PM_QOS_RESUME_LATENCY_DEFAULT_VALUE; |
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c->default_value = PM_QOS_RESUME_LATENCY_DEFAULT_VALUE; |
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c->no_constraint_value = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT; |
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c->type = PM_QOS_MIN; |
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c->notifiers = n; |
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BLOCKING_INIT_NOTIFIER_HEAD(n); |
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c = &qos->latency_tolerance; |
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plist_head_init(&c->list); |
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c->target_value = PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE; |
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c->default_value = PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE; |
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c->no_constraint_value = PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT; |
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c->type = PM_QOS_MIN; |
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freq_constraints_init(&qos->freq); |
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INIT_LIST_HEAD(&qos->flags.list); |
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spin_lock_irq(&dev->power.lock); |
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dev->power.qos = qos; |
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spin_unlock_irq(&dev->power.lock); |
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return 0; |
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} |
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static void __dev_pm_qos_hide_latency_limit(struct device *dev); |
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static void __dev_pm_qos_hide_flags(struct device *dev); |
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|
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/** |
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* dev_pm_qos_constraints_destroy |
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* @dev: target device |
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* |
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* Called from the device PM subsystem on device removal under device_pm_lock(). |
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*/ |
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void dev_pm_qos_constraints_destroy(struct device *dev) |
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{ |
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struct dev_pm_qos *qos; |
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struct dev_pm_qos_request *req, *tmp; |
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struct pm_qos_constraints *c; |
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struct pm_qos_flags *f; |
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mutex_lock(&dev_pm_qos_sysfs_mtx); |
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|
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/* |
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* If the device's PM QoS resume latency limit or PM QoS flags have been |
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* exposed to user space, they have to be hidden at this point. |
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*/ |
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pm_qos_sysfs_remove_resume_latency(dev); |
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pm_qos_sysfs_remove_flags(dev); |
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mutex_lock(&dev_pm_qos_mtx); |
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__dev_pm_qos_hide_latency_limit(dev); |
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__dev_pm_qos_hide_flags(dev); |
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qos = dev->power.qos; |
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if (!qos) |
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goto out; |
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|
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/* Flush the constraints lists for the device. */ |
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c = &qos->resume_latency; |
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plist_for_each_entry_safe(req, tmp, &c->list, data.pnode) { |
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/* |
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* Update constraints list and call the notification |
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* callbacks if needed |
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*/ |
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apply_constraint(req, PM_QOS_REMOVE_REQ, PM_QOS_DEFAULT_VALUE); |
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memset(req, 0, sizeof(*req)); |
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} |
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c = &qos->latency_tolerance; |
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plist_for_each_entry_safe(req, tmp, &c->list, data.pnode) { |
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apply_constraint(req, PM_QOS_REMOVE_REQ, PM_QOS_DEFAULT_VALUE); |
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memset(req, 0, sizeof(*req)); |
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} |
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c = &qos->freq.min_freq; |
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plist_for_each_entry_safe(req, tmp, &c->list, data.freq.pnode) { |
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apply_constraint(req, PM_QOS_REMOVE_REQ, |
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PM_QOS_MIN_FREQUENCY_DEFAULT_VALUE); |
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memset(req, 0, sizeof(*req)); |
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} |
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c = &qos->freq.max_freq; |
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plist_for_each_entry_safe(req, tmp, &c->list, data.freq.pnode) { |
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apply_constraint(req, PM_QOS_REMOVE_REQ, |
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PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE); |
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memset(req, 0, sizeof(*req)); |
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} |
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f = &qos->flags; |
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list_for_each_entry_safe(req, tmp, &f->list, data.flr.node) { |
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apply_constraint(req, PM_QOS_REMOVE_REQ, PM_QOS_DEFAULT_VALUE); |
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memset(req, 0, sizeof(*req)); |
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} |
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spin_lock_irq(&dev->power.lock); |
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dev->power.qos = ERR_PTR(-ENODEV); |
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spin_unlock_irq(&dev->power.lock); |
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kfree(qos->resume_latency.notifiers); |
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kfree(qos); |
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out: |
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mutex_unlock(&dev_pm_qos_mtx); |
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mutex_unlock(&dev_pm_qos_sysfs_mtx); |
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} |
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static bool dev_pm_qos_invalid_req_type(struct device *dev, |
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enum dev_pm_qos_req_type type) |
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{ |
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return type == DEV_PM_QOS_LATENCY_TOLERANCE && |
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!dev->power.set_latency_tolerance; |
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} |
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|
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static int __dev_pm_qos_add_request(struct device *dev, |
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struct dev_pm_qos_request *req, |
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enum dev_pm_qos_req_type type, s32 value) |
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{ |
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int ret = 0; |
|
|
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if (!dev || !req || dev_pm_qos_invalid_req_type(dev, type)) |
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return -EINVAL; |
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|
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if (WARN(dev_pm_qos_request_active(req), |
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"%s() called for already added request\n", __func__)) |
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return -EINVAL; |
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|
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if (IS_ERR(dev->power.qos)) |
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ret = -ENODEV; |
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else if (!dev->power.qos) |
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ret = dev_pm_qos_constraints_allocate(dev); |
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|
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trace_dev_pm_qos_add_request(dev_name(dev), type, value); |
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if (ret) |
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return ret; |
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req->dev = dev; |
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req->type = type; |
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if (req->type == DEV_PM_QOS_MIN_FREQUENCY) |
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ret = freq_qos_add_request(&dev->power.qos->freq, |
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&req->data.freq, |
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FREQ_QOS_MIN, value); |
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else if (req->type == DEV_PM_QOS_MAX_FREQUENCY) |
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ret = freq_qos_add_request(&dev->power.qos->freq, |
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&req->data.freq, |
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FREQ_QOS_MAX, value); |
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else |
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ret = apply_constraint(req, PM_QOS_ADD_REQ, value); |
|
|
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return ret; |
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} |
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|
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/** |
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* dev_pm_qos_add_request - inserts new qos request into the list |
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* @dev: target device for the constraint |
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* @req: pointer to a preallocated handle |
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* @type: type of the request |
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* @value: defines the qos request |
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* |
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* This function inserts a new entry in the device constraints list of |
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* requested qos performance characteristics. It recomputes the aggregate |
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* QoS expectations of parameters and initializes the dev_pm_qos_request |
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* handle. Caller needs to save this handle for later use in updates and |
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* removal. |
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* |
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* Returns 1 if the aggregated constraint value has changed, |
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* 0 if the aggregated constraint value has not changed, |
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* -EINVAL in case of wrong parameters, -ENOMEM if there's not enough memory |
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* to allocate for data structures, -ENODEV if the device has just been removed |
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* from the system. |
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* |
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* Callers should ensure that the target device is not RPM_SUSPENDED before |
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* using this function for requests of type DEV_PM_QOS_FLAGS. |
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*/ |
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int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req, |
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enum dev_pm_qos_req_type type, s32 value) |
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{ |
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int ret; |
|
|
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mutex_lock(&dev_pm_qos_mtx); |
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ret = __dev_pm_qos_add_request(dev, req, type, value); |
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mutex_unlock(&dev_pm_qos_mtx); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(dev_pm_qos_add_request); |
|
|
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/** |
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* __dev_pm_qos_update_request - Modify an existing device PM QoS request. |
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* @req : PM QoS request to modify. |
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* @new_value: New value to request. |
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*/ |
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static int __dev_pm_qos_update_request(struct dev_pm_qos_request *req, |
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s32 new_value) |
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{ |
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s32 curr_value; |
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int ret = 0; |
|
|
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if (!req) /*guard against callers passing in null */ |
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return -EINVAL; |
|
|
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if (WARN(!dev_pm_qos_request_active(req), |
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"%s() called for unknown object\n", __func__)) |
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return -EINVAL; |
|
|
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if (IS_ERR_OR_NULL(req->dev->power.qos)) |
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return -ENODEV; |
|
|
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switch(req->type) { |
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case DEV_PM_QOS_RESUME_LATENCY: |
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case DEV_PM_QOS_LATENCY_TOLERANCE: |
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curr_value = req->data.pnode.prio; |
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break; |
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case DEV_PM_QOS_MIN_FREQUENCY: |
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case DEV_PM_QOS_MAX_FREQUENCY: |
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curr_value = req->data.freq.pnode.prio; |
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break; |
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case DEV_PM_QOS_FLAGS: |
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curr_value = req->data.flr.flags; |
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break; |
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default: |
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return -EINVAL; |
|
} |
|
|
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trace_dev_pm_qos_update_request(dev_name(req->dev), req->type, |
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new_value); |
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if (curr_value != new_value) |
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ret = apply_constraint(req, PM_QOS_UPDATE_REQ, new_value); |
|
|
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return ret; |
|
} |
|
|
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/** |
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* 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 |
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* |
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* Updates an existing dev PM qos request along with updating the |
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* target value. |
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* |
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* Attempts are made to make this code callable on hot code paths. |
|
* |
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* Returns 1 if the aggregated constraint value has changed, |
|
* 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. |
|
*/ |
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int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value) |
|
{ |
|
int ret; |
|
|
|
mutex_lock(&dev_pm_qos_mtx); |
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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); |
|
|
|
static int __dev_pm_qos_remove_request(struct dev_pm_qos_request *req) |
|
{ |
|
int ret; |
|
|
|
if (!req) /*guard against callers passing in null */ |
|
return -EINVAL; |
|
|
|
if (WARN(!dev_pm_qos_request_active(req), |
|
"%s() called for unknown object\n", __func__)) |
|
return -EINVAL; |
|
|
|
if (IS_ERR_OR_NULL(req->dev->power.qos)) |
|
return -ENODEV; |
|
|
|
trace_dev_pm_qos_remove_request(dev_name(req->dev), req->type, |
|
PM_QOS_DEFAULT_VALUE); |
|
ret = apply_constraint(req, PM_QOS_REMOVE_REQ, PM_QOS_DEFAULT_VALUE); |
|
memset(req, 0, sizeof(*req)); |
|
return ret; |
|
} |
|
|
|
/** |
|
* dev_pm_qos_remove_request - modifies an existing qos request |
|
* @req: handle to request list element |
|
* |
|
* Will remove pm qos request from the list of constraints and |
|
* recompute the current target value. Call this on slow code paths. |
|
* |
|
* Returns 1 if the aggregated constraint value has changed, |
|
* 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) |
|
{ |
|
int ret; |
|
|
|
mutex_lock(&dev_pm_qos_mtx); |
|
ret = __dev_pm_qos_remove_request(req); |
|
mutex_unlock(&dev_pm_qos_mtx); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(dev_pm_qos_remove_request); |
|
|
|
/** |
|
* dev_pm_qos_add_notifier - sets notification entry for changes to target value |
|
* of per-device PM QoS constraints |
|
* |
|
* @dev: target device for the constraint |
|
* @notifier: notifier block managed by caller. |
|
* @type: request type. |
|
* |
|
* Will register the notifier into a notification chain that gets called |
|
* upon changes to the target value for the device. |
|
* |
|
* If the device's constraints object doesn't exist when this routine is called, |
|
* it will be created (or error code will be returned if that fails). |
|
*/ |
|
int dev_pm_qos_add_notifier(struct device *dev, struct notifier_block *notifier, |
|
enum dev_pm_qos_req_type type) |
|
{ |
|
int ret = 0; |
|
|
|
mutex_lock(&dev_pm_qos_mtx); |
|
|
|
if (IS_ERR(dev->power.qos)) |
|
ret = -ENODEV; |
|
else if (!dev->power.qos) |
|
ret = dev_pm_qos_constraints_allocate(dev); |
|
|
|
if (ret) |
|
goto unlock; |
|
|
|
switch (type) { |
|
case DEV_PM_QOS_RESUME_LATENCY: |
|
ret = blocking_notifier_chain_register(dev->power.qos->resume_latency.notifiers, |
|
notifier); |
|
break; |
|
case DEV_PM_QOS_MIN_FREQUENCY: |
|
ret = freq_qos_add_notifier(&dev->power.qos->freq, |
|
FREQ_QOS_MIN, notifier); |
|
break; |
|
case DEV_PM_QOS_MAX_FREQUENCY: |
|
ret = freq_qos_add_notifier(&dev->power.qos->freq, |
|
FREQ_QOS_MAX, notifier); |
|
break; |
|
default: |
|
WARN_ON(1); |
|
ret = -EINVAL; |
|
} |
|
|
|
unlock: |
|
mutex_unlock(&dev_pm_qos_mtx); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(dev_pm_qos_add_notifier); |
|
|
|
/** |
|
* dev_pm_qos_remove_notifier - deletes notification for changes to target value |
|
* of per-device PM QoS constraints |
|
* |
|
* @dev: target device for the constraint |
|
* @notifier: notifier block to be removed. |
|
* @type: request type. |
|
* |
|
* Will remove the notifier from the notification chain that gets called |
|
* upon changes to the target value. |
|
*/ |
|
int dev_pm_qos_remove_notifier(struct device *dev, |
|
struct notifier_block *notifier, |
|
enum dev_pm_qos_req_type type) |
|
{ |
|
int ret = 0; |
|
|
|
mutex_lock(&dev_pm_qos_mtx); |
|
|
|
/* Silently return if the constraints object is not present. */ |
|
if (IS_ERR_OR_NULL(dev->power.qos)) |
|
goto unlock; |
|
|
|
switch (type) { |
|
case DEV_PM_QOS_RESUME_LATENCY: |
|
ret = blocking_notifier_chain_unregister(dev->power.qos->resume_latency.notifiers, |
|
notifier); |
|
break; |
|
case DEV_PM_QOS_MIN_FREQUENCY: |
|
ret = freq_qos_remove_notifier(&dev->power.qos->freq, |
|
FREQ_QOS_MIN, notifier); |
|
break; |
|
case DEV_PM_QOS_MAX_FREQUENCY: |
|
ret = freq_qos_remove_notifier(&dev->power.qos->freq, |
|
FREQ_QOS_MAX, notifier); |
|
break; |
|
default: |
|
WARN_ON(1); |
|
ret = -EINVAL; |
|
} |
|
|
|
unlock: |
|
mutex_unlock(&dev_pm_qos_mtx); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(dev_pm_qos_remove_notifier); |
|
|
|
/** |
|
* dev_pm_qos_add_ancestor_request - Add PM QoS request for device's ancestor. |
|
* @dev: Device whose ancestor to add the request for. |
|
* @req: Pointer to the preallocated handle. |
|
* @type: Type of the request. |
|
* @value: Constraint latency value. |
|
*/ |
|
int dev_pm_qos_add_ancestor_request(struct device *dev, |
|
struct dev_pm_qos_request *req, |
|
enum dev_pm_qos_req_type type, s32 value) |
|
{ |
|
struct device *ancestor = dev->parent; |
|
int ret = -ENODEV; |
|
|
|
switch (type) { |
|
case DEV_PM_QOS_RESUME_LATENCY: |
|
while (ancestor && !ancestor->power.ignore_children) |
|
ancestor = ancestor->parent; |
|
|
|
break; |
|
case DEV_PM_QOS_LATENCY_TOLERANCE: |
|
while (ancestor && !ancestor->power.set_latency_tolerance) |
|
ancestor = ancestor->parent; |
|
|
|
break; |
|
default: |
|
ancestor = NULL; |
|
} |
|
if (ancestor) |
|
ret = dev_pm_qos_add_request(ancestor, req, type, value); |
|
|
|
if (ret < 0) |
|
req->dev = NULL; |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(dev_pm_qos_add_ancestor_request); |
|
|
|
static void __dev_pm_qos_drop_user_request(struct device *dev, |
|
enum dev_pm_qos_req_type type) |
|
{ |
|
struct dev_pm_qos_request *req = NULL; |
|
|
|
switch(type) { |
|
case DEV_PM_QOS_RESUME_LATENCY: |
|
req = dev->power.qos->resume_latency_req; |
|
dev->power.qos->resume_latency_req = NULL; |
|
break; |
|
case DEV_PM_QOS_LATENCY_TOLERANCE: |
|
req = dev->power.qos->latency_tolerance_req; |
|
dev->power.qos->latency_tolerance_req = NULL; |
|
break; |
|
case DEV_PM_QOS_FLAGS: |
|
req = dev->power.qos->flags_req; |
|
dev->power.qos->flags_req = NULL; |
|
break; |
|
default: |
|
WARN_ON(1); |
|
return; |
|
} |
|
__dev_pm_qos_remove_request(req); |
|
kfree(req); |
|
} |
|
|
|
static void dev_pm_qos_drop_user_request(struct device *dev, |
|
enum dev_pm_qos_req_type type) |
|
{ |
|
mutex_lock(&dev_pm_qos_mtx); |
|
__dev_pm_qos_drop_user_request(dev, type); |
|
mutex_unlock(&dev_pm_qos_mtx); |
|
} |
|
|
|
/** |
|
* dev_pm_qos_expose_latency_limit - Expose PM QoS latency limit to user space. |
|
* @dev: Device whose PM QoS latency limit is to be exposed to user space. |
|
* @value: Initial value of the latency limit. |
|
*/ |
|
int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value) |
|
{ |
|
struct dev_pm_qos_request *req; |
|
int ret; |
|
|
|
if (!device_is_registered(dev) || value < 0) |
|
return -EINVAL; |
|
|
|
req = kzalloc(sizeof(*req), GFP_KERNEL); |
|
if (!req) |
|
return -ENOMEM; |
|
|
|
ret = dev_pm_qos_add_request(dev, req, DEV_PM_QOS_RESUME_LATENCY, value); |
|
if (ret < 0) { |
|
kfree(req); |
|
return ret; |
|
} |
|
|
|
mutex_lock(&dev_pm_qos_sysfs_mtx); |
|
|
|
mutex_lock(&dev_pm_qos_mtx); |
|
|
|
if (IS_ERR_OR_NULL(dev->power.qos)) |
|
ret = -ENODEV; |
|
else if (dev->power.qos->resume_latency_req) |
|
ret = -EEXIST; |
|
|
|
if (ret < 0) { |
|
__dev_pm_qos_remove_request(req); |
|
kfree(req); |
|
mutex_unlock(&dev_pm_qos_mtx); |
|
goto out; |
|
} |
|
dev->power.qos->resume_latency_req = req; |
|
|
|
mutex_unlock(&dev_pm_qos_mtx); |
|
|
|
ret = pm_qos_sysfs_add_resume_latency(dev); |
|
if (ret) |
|
dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_RESUME_LATENCY); |
|
|
|
out: |
|
mutex_unlock(&dev_pm_qos_sysfs_mtx); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(dev_pm_qos_expose_latency_limit); |
|
|
|
static void __dev_pm_qos_hide_latency_limit(struct device *dev) |
|
{ |
|
if (!IS_ERR_OR_NULL(dev->power.qos) && dev->power.qos->resume_latency_req) |
|
__dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_RESUME_LATENCY); |
|
} |
|
|
|
/** |
|
* dev_pm_qos_hide_latency_limit - Hide PM QoS latency limit from user space. |
|
* @dev: Device whose PM QoS latency limit is to be hidden from user space. |
|
*/ |
|
void dev_pm_qos_hide_latency_limit(struct device *dev) |
|
{ |
|
mutex_lock(&dev_pm_qos_sysfs_mtx); |
|
|
|
pm_qos_sysfs_remove_resume_latency(dev); |
|
|
|
mutex_lock(&dev_pm_qos_mtx); |
|
__dev_pm_qos_hide_latency_limit(dev); |
|
mutex_unlock(&dev_pm_qos_mtx); |
|
|
|
mutex_unlock(&dev_pm_qos_sysfs_mtx); |
|
} |
|
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; |
|
|
|
req = kzalloc(sizeof(*req), GFP_KERNEL); |
|
if (!req) |
|
return -ENOMEM; |
|
|
|
ret = dev_pm_qos_add_request(dev, req, DEV_PM_QOS_FLAGS, val); |
|
if (ret < 0) { |
|
kfree(req); |
|
return ret; |
|
} |
|
|
|
pm_runtime_get_sync(dev); |
|
mutex_lock(&dev_pm_qos_sysfs_mtx); |
|
|
|
mutex_lock(&dev_pm_qos_mtx); |
|
|
|
if (IS_ERR_OR_NULL(dev->power.qos)) |
|
ret = -ENODEV; |
|
else if (dev->power.qos->flags_req) |
|
ret = -EEXIST; |
|
|
|
if (ret < 0) { |
|
__dev_pm_qos_remove_request(req); |
|
kfree(req); |
|
mutex_unlock(&dev_pm_qos_mtx); |
|
goto out; |
|
} |
|
dev->power.qos->flags_req = req; |
|
|
|
mutex_unlock(&dev_pm_qos_mtx); |
|
|
|
ret = pm_qos_sysfs_add_flags(dev); |
|
if (ret) |
|
dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_FLAGS); |
|
|
|
out: |
|
mutex_unlock(&dev_pm_qos_sysfs_mtx); |
|
pm_runtime_put(dev); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(dev_pm_qos_expose_flags); |
|
|
|
static void __dev_pm_qos_hide_flags(struct device *dev) |
|
{ |
|
if (!IS_ERR_OR_NULL(dev->power.qos) && dev->power.qos->flags_req) |
|
__dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_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) |
|
{ |
|
pm_runtime_get_sync(dev); |
|
mutex_lock(&dev_pm_qos_sysfs_mtx); |
|
|
|
pm_qos_sysfs_remove_flags(dev); |
|
|
|
mutex_lock(&dev_pm_qos_mtx); |
|
__dev_pm_qos_hide_flags(dev); |
|
mutex_unlock(&dev_pm_qos_mtx); |
|
|
|
mutex_unlock(&dev_pm_qos_sysfs_mtx); |
|
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; |
|
|
|
pm_runtime_get_sync(dev); |
|
mutex_lock(&dev_pm_qos_mtx); |
|
|
|
if (IS_ERR_OR_NULL(dev->power.qos) || !dev->power.qos->flags_req) { |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
|
|
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); |
|
|
|
out: |
|
mutex_unlock(&dev_pm_qos_mtx); |
|
pm_runtime_put(dev); |
|
return ret; |
|
} |
|
|
|
/** |
|
* dev_pm_qos_get_user_latency_tolerance - Get user space latency tolerance. |
|
* @dev: Device to obtain the user space latency tolerance for. |
|
*/ |
|
s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev) |
|
{ |
|
s32 ret; |
|
|
|
mutex_lock(&dev_pm_qos_mtx); |
|
ret = IS_ERR_OR_NULL(dev->power.qos) |
|
|| !dev->power.qos->latency_tolerance_req ? |
|
PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT : |
|
dev->power.qos->latency_tolerance_req->data.pnode.prio; |
|
mutex_unlock(&dev_pm_qos_mtx); |
|
return ret; |
|
} |
|
|
|
/** |
|
* dev_pm_qos_update_user_latency_tolerance - Update user space latency tolerance. |
|
* @dev: Device to update the user space latency tolerance for. |
|
* @val: New user space latency tolerance for @dev (negative values disable). |
|
*/ |
|
int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val) |
|
{ |
|
int ret; |
|
|
|
mutex_lock(&dev_pm_qos_mtx); |
|
|
|
if (IS_ERR_OR_NULL(dev->power.qos) |
|
|| !dev->power.qos->latency_tolerance_req) { |
|
struct dev_pm_qos_request *req; |
|
|
|
if (val < 0) { |
|
if (val == PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT) |
|
ret = 0; |
|
else |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
req = kzalloc(sizeof(*req), GFP_KERNEL); |
|
if (!req) { |
|
ret = -ENOMEM; |
|
goto out; |
|
} |
|
ret = __dev_pm_qos_add_request(dev, req, DEV_PM_QOS_LATENCY_TOLERANCE, val); |
|
if (ret < 0) { |
|
kfree(req); |
|
goto out; |
|
} |
|
dev->power.qos->latency_tolerance_req = req; |
|
} else { |
|
if (val < 0) { |
|
__dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_LATENCY_TOLERANCE); |
|
ret = 0; |
|
} else { |
|
ret = __dev_pm_qos_update_request(dev->power.qos->latency_tolerance_req, val); |
|
} |
|
} |
|
|
|
out: |
|
mutex_unlock(&dev_pm_qos_mtx); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(dev_pm_qos_update_user_latency_tolerance); |
|
|
|
/** |
|
* dev_pm_qos_expose_latency_tolerance - Expose latency tolerance to userspace |
|
* @dev: Device whose latency tolerance to expose |
|
*/ |
|
int dev_pm_qos_expose_latency_tolerance(struct device *dev) |
|
{ |
|
int ret; |
|
|
|
if (!dev->power.set_latency_tolerance) |
|
return -EINVAL; |
|
|
|
mutex_lock(&dev_pm_qos_sysfs_mtx); |
|
ret = pm_qos_sysfs_add_latency_tolerance(dev); |
|
mutex_unlock(&dev_pm_qos_sysfs_mtx); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(dev_pm_qos_expose_latency_tolerance); |
|
|
|
/** |
|
* dev_pm_qos_hide_latency_tolerance - Hide latency tolerance from userspace |
|
* @dev: Device whose latency tolerance to hide |
|
*/ |
|
void dev_pm_qos_hide_latency_tolerance(struct device *dev) |
|
{ |
|
mutex_lock(&dev_pm_qos_sysfs_mtx); |
|
pm_qos_sysfs_remove_latency_tolerance(dev); |
|
mutex_unlock(&dev_pm_qos_sysfs_mtx); |
|
|
|
/* Remove the request from user space now */ |
|
pm_runtime_get_sync(dev); |
|
dev_pm_qos_update_user_latency_tolerance(dev, |
|
PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT); |
|
pm_runtime_put(dev); |
|
} |
|
EXPORT_SYMBOL_GPL(dev_pm_qos_hide_latency_tolerance);
|
|
|