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4ce4780270
Local variable 'error' in dev_pm_qos_add_ancestor_request() need not contain error codes only, so rename it to 'ret'. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
705 lines
19 KiB
C
705 lines
19 KiB
C
/*
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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 program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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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 different types of notification callbacks:
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* . a per-device notification callback using the dev_pm_qos_*_notifier API.
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* The notification chain data is stored in the per-device constraint
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* data struct.
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* . a system-wide notification callback using the dev_pm_qos_*_global_notifier
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* API. The notification chain data is stored in a static variable.
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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 tored 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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#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 "power.h"
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static DEFINE_MUTEX(dev_pm_qos_mtx);
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static BLOCKING_NOTIFIER_HEAD(dev_pm_notifiers);
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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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if (!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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return PM_QOS_FLAGS_NONE;
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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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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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return ret;
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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.
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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_read_value(struct device *dev)
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{
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return dev->power.qos ? pm_qos_read_value(&dev->power.qos->latency) : 0;
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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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*/
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s32 dev_pm_qos_read_value(struct device *dev)
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{
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unsigned long flags;
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s32 ret;
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spin_lock_irqsave(&dev->power.lock, flags);
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ret = __dev_pm_qos_read_value(dev);
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spin_unlock_irqrestore(&dev->power.lock, flags);
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return ret;
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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 and the global notification
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* 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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switch(req->type) {
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case DEV_PM_QOS_LATENCY:
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ret = pm_qos_update_target(&qos->latency, &req->data.pnode,
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action, value);
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if (ret) {
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value = pm_qos_read_value(&qos->latency);
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blocking_notifier_call_chain(&dev_pm_notifiers,
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(unsigned long)value,
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req);
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}
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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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return ret;
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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(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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BLOCKING_INIT_NOTIFIER_HEAD(n);
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c = &qos->latency;
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plist_head_init(&c->list);
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c->target_value = PM_QOS_DEV_LAT_DEFAULT_VALUE;
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c->default_value = PM_QOS_DEV_LAT_DEFAULT_VALUE;
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c->type = PM_QOS_MIN;
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c->notifiers = n;
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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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/**
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* dev_pm_qos_constraints_init - Initalize device's PM QoS constraints pointer.
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* @dev: target device
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*
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* Called from the device PM subsystem during device insertion under
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* device_pm_lock().
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*/
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void dev_pm_qos_constraints_init(struct device *dev)
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{
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mutex_lock(&dev_pm_qos_mtx);
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dev->power.qos = NULL;
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dev->power.power_state = PMSG_ON;
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mutex_unlock(&dev_pm_qos_mtx);
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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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/*
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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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dev_pm_qos_hide_latency_limit(dev);
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dev_pm_qos_hide_flags(dev);
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mutex_lock(&dev_pm_qos_mtx);
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dev->power.power_state = PMSG_INVALID;
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qos = dev->power.qos;
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if (!qos)
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goto out;
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/* Flush the constraints lists for the device. */
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c = &qos->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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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 = NULL;
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spin_unlock_irq(&dev->power.lock);
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kfree(c->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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}
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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 = 0;
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if (!dev || !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 already added request\n", __func__))
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return -EINVAL;
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req->dev = dev;
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mutex_lock(&dev_pm_qos_mtx);
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if (!dev->power.qos) {
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if (dev->power.power_state.event == PM_EVENT_INVALID) {
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/* The device has been removed from the system. */
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req->dev = NULL;
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ret = -ENODEV;
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goto out;
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} else {
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/*
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* Allocate the constraints data on the first call to
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* add_request, i.e. only if the data is not already
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* allocated and if the device has not been removed.
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*/
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ret = dev_pm_qos_constraints_allocate(dev);
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}
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}
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if (!ret) {
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req->type = type;
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ret = apply_constraint(req, PM_QOS_ADD_REQ, value);
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}
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out:
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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->dev->power.qos)
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return -ENODEV;
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switch(req->type) {
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case DEV_PM_QOS_LATENCY:
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curr_value = req->data.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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}
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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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/**
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* dev_pm_qos_update_request - modifies an existing qos request
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* @req : handle to list element holding a dev_pm_qos request to use
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* @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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*
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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, -ENODEV if the device has been
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* removed 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_update_request(struct dev_pm_qos_request *req, s32 new_value)
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{
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int ret;
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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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mutex_lock(&dev_pm_qos_mtx);
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ret = __dev_pm_qos_update_request(req, new_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_update_request);
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/**
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* dev_pm_qos_remove_request - modifies an existing qos request
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* @req: handle to request list element
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*
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* Will remove pm qos request from the list of constraints and
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* recompute the current target value. Call this on slow code paths.
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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, -ENODEV if the device has been
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* removed 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_remove_request(struct dev_pm_qos_request *req)
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{
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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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mutex_lock(&dev_pm_qos_mtx);
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if (req->dev->power.qos) {
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ret = apply_constraint(req, PM_QOS_REMOVE_REQ,
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PM_QOS_DEFAULT_VALUE);
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memset(req, 0, sizeof(*req));
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} else {
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/* Return if the device has been removed */
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ret = -ENODEV;
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}
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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_remove_request);
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/**
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* dev_pm_qos_add_notifier - sets notification entry for changes to target value
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* of per-device PM QoS constraints
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*
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* @dev: target device for the constraint
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* @notifier: notifier block managed by caller.
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*
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* Will register the notifier into a notification chain that gets called
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* upon changes to the target value for the device.
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*
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* If the device's constraints object doesn't exist when this routine is called,
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* it will be created (or error code will be returned if that fails).
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*/
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int dev_pm_qos_add_notifier(struct device *dev, struct notifier_block *notifier)
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{
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int ret = 0;
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mutex_lock(&dev_pm_qos_mtx);
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if (!dev->power.qos)
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ret = dev->power.power_state.event != PM_EVENT_INVALID ?
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dev_pm_qos_constraints_allocate(dev) : -ENODEV;
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if (!ret)
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ret = blocking_notifier_chain_register(
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dev->power.qos->latency.notifiers, notifier);
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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_notifier);
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/**
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* dev_pm_qos_remove_notifier - deletes notification for changes to target value
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* of per-device PM QoS constraints
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*
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* @dev: target device for the constraint
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* @notifier: notifier block to be removed.
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*
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* Will remove the notifier from the notification chain that gets called
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* upon changes to the target value.
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*/
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int dev_pm_qos_remove_notifier(struct device *dev,
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struct notifier_block *notifier)
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{
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int retval = 0;
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mutex_lock(&dev_pm_qos_mtx);
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/* Silently return if the constraints object is not present. */
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if (dev->power.qos)
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retval = blocking_notifier_chain_unregister(
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dev->power.qos->latency.notifiers,
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notifier);
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mutex_unlock(&dev_pm_qos_mtx);
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return retval;
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}
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EXPORT_SYMBOL_GPL(dev_pm_qos_remove_notifier);
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/**
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* dev_pm_qos_add_global_notifier - sets notification entry for changes to
|
|
* target value of the PM QoS constraints for any device
|
|
*
|
|
* @notifier: notifier block managed by caller.
|
|
*
|
|
* Will register the notifier into a notification chain that gets called
|
|
* upon changes to the target value for any device.
|
|
*/
|
|
int dev_pm_qos_add_global_notifier(struct notifier_block *notifier)
|
|
{
|
|
return blocking_notifier_chain_register(&dev_pm_notifiers, notifier);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_qos_add_global_notifier);
|
|
|
|
/**
|
|
* dev_pm_qos_remove_global_notifier - deletes notification for changes to
|
|
* target value of PM QoS constraints for any device
|
|
*
|
|
* @notifier: notifier block to be removed.
|
|
*
|
|
* Will remove the notifier from the notification chain that gets called
|
|
* upon changes to the target value for any device.
|
|
*/
|
|
int dev_pm_qos_remove_global_notifier(struct notifier_block *notifier)
|
|
{
|
|
return blocking_notifier_chain_unregister(&dev_pm_notifiers, notifier);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_qos_remove_global_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.
|
|
* @value: Constraint latency value.
|
|
*/
|
|
int dev_pm_qos_add_ancestor_request(struct device *dev,
|
|
struct dev_pm_qos_request *req, s32 value)
|
|
{
|
|
struct device *ancestor = dev->parent;
|
|
int ret = -ENODEV;
|
|
|
|
while (ancestor && !ancestor->power.ignore_children)
|
|
ancestor = ancestor->parent;
|
|
|
|
if (ancestor)
|
|
ret = dev_pm_qos_add_request(ancestor, req,
|
|
DEV_PM_QOS_LATENCY, value);
|
|
|
|
if (ret < 0)
|
|
req->dev = NULL;
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_qos_add_ancestor_request);
|
|
|
|
#ifdef CONFIG_PM_RUNTIME
|
|
static void __dev_pm_qos_drop_user_request(struct device *dev,
|
|
enum dev_pm_qos_req_type type)
|
|
{
|
|
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;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
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, DEV_PM_QOS_LATENCY, value);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
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_LATENCY);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_qos_expose_latency_limit);
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
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 */
|