forked from luck/tmp_suning_uos_patched
2552d35201
First, rename PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE to PM_QOS_CPU_LATENCY_DEFAULT_VALUE and update all of the code referring to it accordingly. Next, rename cpu_dma_constraints to cpu_latency_constraints, move the definition of it closer to the functions referring to it and update all of them accordingly. [While at it, add a comment to mark the start of the code related to the CPU latency QoS.] Finally, rename the pm_qos_power_*() family of functions and pm_qos_power_fops to cpu_latency_qos_*() and cpu_latency_qos_fops, respectively, and update the definition of cpu_latency_qos_miscdev. [While at it, update the miscdev interface code start comment.] No intentional functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org> Tested-by: Amit Kucheria <amit.kucheria@linaro.org>
683 lines
18 KiB
C
683 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* This module exposes the interface to kernel space for specifying
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* QoS dependencies. It provides infrastructure for registration 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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*
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* There are 3 basic classes of QoS parameter: latency, timeout, throughput
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* each have defined units:
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* latency: usec
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* timeout: usec <-- currently not used.
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* throughput: kbs (kilo byte / sec)
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*
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* There are lists of pm_qos_objects each one wrapping requests, notifiers
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*
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* User mode requests on a QOS parameter register themselves to the
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* subsystem by opening the device node /dev/... and writing there request to
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* the node. As long as the process holds a file handle open to the node the
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* client continues to be accounted for. Upon file release the usermode
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* request is removed and a new qos target is computed. This way when the
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* request that the application has is cleaned up when closes the file
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* pointer or exits the pm_qos_object will get an opportunity to clean up.
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*
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* Mark Gross <mgross@linux.intel.com>
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*/
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/*#define DEBUG*/
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#include <linux/pm_qos.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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#include <linux/time.h>
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#include <linux/fs.h>
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#include <linux/device.h>
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#include <linux/miscdevice.h>
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#include <linux/string.h>
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#include <linux/platform_device.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/uaccess.h>
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#include <linux/export.h>
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#include <trace/events/power.h>
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/*
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* locking rule: all changes to constraints or notifiers lists
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* or pm_qos_object list and pm_qos_objects need to happen with pm_qos_lock
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* held, taken with _irqsave. One lock to rule them all
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*/
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static DEFINE_SPINLOCK(pm_qos_lock);
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/**
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* pm_qos_read_value - Return the current effective constraint value.
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* @c: List of PM QoS constraint requests.
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*/
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s32 pm_qos_read_value(struct pm_qos_constraints *c)
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{
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return c->target_value;
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}
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static int pm_qos_get_value(struct pm_qos_constraints *c)
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{
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if (plist_head_empty(&c->list))
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return c->no_constraint_value;
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switch (c->type) {
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case PM_QOS_MIN:
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return plist_first(&c->list)->prio;
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case PM_QOS_MAX:
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return plist_last(&c->list)->prio;
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default:
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WARN(1, "Unknown PM QoS type in %s\n", __func__);
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return PM_QOS_DEFAULT_VALUE;
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}
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}
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static void pm_qos_set_value(struct pm_qos_constraints *c, s32 value)
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{
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c->target_value = value;
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}
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/**
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* pm_qos_update_target - Update a list of PM QoS constraint requests.
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* @c: List of PM QoS requests.
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* @node: Target list entry.
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* @action: Action to carry out (add, update or remove).
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* @value: New request value for the target list entry.
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*
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* Update the given list of PM QoS constraint requests, @c, by carrying an
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* @action involving the @node list entry and @value on it.
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*
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* The recognized values of @action are PM_QOS_ADD_REQ (store @value in @node
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* and add it to the list), PM_QOS_UPDATE_REQ (remove @node from the list, store
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* @value in it and add it to the list again), and PM_QOS_REMOVE_REQ (remove
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* @node from the list, ignore @value).
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*
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* Return: 1 if the aggregate constraint value has changed, 0 otherwise.
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*/
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int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
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enum pm_qos_req_action action, int value)
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{
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int prev_value, curr_value, new_value;
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unsigned long flags;
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spin_lock_irqsave(&pm_qos_lock, flags);
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prev_value = pm_qos_get_value(c);
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if (value == PM_QOS_DEFAULT_VALUE)
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new_value = c->default_value;
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else
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new_value = value;
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switch (action) {
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case PM_QOS_REMOVE_REQ:
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plist_del(node, &c->list);
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break;
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case PM_QOS_UPDATE_REQ:
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/*
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* To change the list, atomically remove, reinit with new value
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* and add, then see if the aggregate has changed.
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*/
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plist_del(node, &c->list);
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/* fall through */
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case PM_QOS_ADD_REQ:
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plist_node_init(node, new_value);
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plist_add(node, &c->list);
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break;
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default:
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/* no action */
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;
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}
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curr_value = pm_qos_get_value(c);
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pm_qos_set_value(c, curr_value);
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spin_unlock_irqrestore(&pm_qos_lock, flags);
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trace_pm_qos_update_target(action, prev_value, curr_value);
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if (prev_value == curr_value)
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return 0;
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if (c->notifiers)
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blocking_notifier_call_chain(c->notifiers, curr_value, NULL);
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return 1;
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}
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/**
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* pm_qos_flags_remove_req - Remove device PM QoS flags request.
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* @pqf: Device PM QoS flags set to remove the request from.
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* @req: Request to remove from the set.
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*/
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static void pm_qos_flags_remove_req(struct pm_qos_flags *pqf,
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struct pm_qos_flags_request *req)
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{
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s32 val = 0;
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list_del(&req->node);
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list_for_each_entry(req, &pqf->list, node)
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val |= req->flags;
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pqf->effective_flags = val;
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}
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/**
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* pm_qos_update_flags - Update a set of PM QoS flags.
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* @pqf: Set of PM QoS flags to update.
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* @req: Request to add to the set, to modify, or to remove from the set.
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* @action: Action to take on the set.
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* @val: Value of the request to add or modify.
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*
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* Return: 1 if the aggregate constraint value has changed, 0 otherwise.
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*/
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bool pm_qos_update_flags(struct pm_qos_flags *pqf,
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struct pm_qos_flags_request *req,
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enum pm_qos_req_action action, s32 val)
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{
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unsigned long irqflags;
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s32 prev_value, curr_value;
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spin_lock_irqsave(&pm_qos_lock, irqflags);
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prev_value = list_empty(&pqf->list) ? 0 : pqf->effective_flags;
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switch (action) {
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case PM_QOS_REMOVE_REQ:
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pm_qos_flags_remove_req(pqf, req);
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break;
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case PM_QOS_UPDATE_REQ:
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pm_qos_flags_remove_req(pqf, req);
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/* fall through */
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case PM_QOS_ADD_REQ:
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req->flags = val;
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INIT_LIST_HEAD(&req->node);
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list_add_tail(&req->node, &pqf->list);
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pqf->effective_flags |= val;
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break;
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default:
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/* no action */
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;
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}
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curr_value = list_empty(&pqf->list) ? 0 : pqf->effective_flags;
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spin_unlock_irqrestore(&pm_qos_lock, irqflags);
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trace_pm_qos_update_flags(action, prev_value, curr_value);
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return prev_value != curr_value;
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}
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/* Definitions related to the CPU latency QoS. */
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static struct pm_qos_constraints cpu_latency_constraints = {
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.list = PLIST_HEAD_INIT(cpu_latency_constraints.list),
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.target_value = PM_QOS_CPU_LATENCY_DEFAULT_VALUE,
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.default_value = PM_QOS_CPU_LATENCY_DEFAULT_VALUE,
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.no_constraint_value = PM_QOS_CPU_LATENCY_DEFAULT_VALUE,
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.type = PM_QOS_MIN,
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};
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/**
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* pm_qos_request - returns current system wide qos expectation
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* @pm_qos_class: Ignored.
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*
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* This function returns the current target value.
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*/
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int pm_qos_request(int pm_qos_class)
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{
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return pm_qos_read_value(&cpu_latency_constraints);
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}
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EXPORT_SYMBOL_GPL(pm_qos_request);
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int pm_qos_request_active(struct pm_qos_request *req)
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{
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return req->qos == &cpu_latency_constraints;
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}
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EXPORT_SYMBOL_GPL(pm_qos_request_active);
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static void cpu_latency_qos_update(struct pm_qos_request *req,
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enum pm_qos_req_action action, s32 value)
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{
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int ret = pm_qos_update_target(req->qos, &req->node, action, value);
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if (ret > 0)
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wake_up_all_idle_cpus();
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}
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/**
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* pm_qos_add_request - inserts new qos request into the list
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* @req: pointer to a preallocated handle
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* @pm_qos_class: Ignored.
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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 PM_QOS_CPU_DMA_LATENCY list of
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* requested QoS performance characteristics. It recomputes the aggregate QoS
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* expectations for the PM_QOS_CPU_DMA_LATENCY list and initializes the @req
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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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void pm_qos_add_request(struct pm_qos_request *req,
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int pm_qos_class, s32 value)
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{
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if (!req) /*guard against callers passing in null */
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return;
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if (pm_qos_request_active(req)) {
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WARN(1, KERN_ERR "pm_qos_add_request() called for already added request\n");
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return;
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}
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trace_pm_qos_add_request(PM_QOS_CPU_DMA_LATENCY, value);
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req->qos = &cpu_latency_constraints;
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cpu_latency_qos_update(req, PM_QOS_ADD_REQ, value);
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}
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EXPORT_SYMBOL_GPL(pm_qos_add_request);
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/**
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* pm_qos_update_request - modifies an existing qos request
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* @req : handle to list element holding a pm_qos request to use
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* @value: defines the qos request
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*
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* Updates an existing qos request for the PM_QOS_CPU_DMA_LATENCY list along
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* with updating the target PM_QOS_CPU_DMA_LATENCY 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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void pm_qos_update_request(struct pm_qos_request *req, s32 new_value)
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{
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if (!req) /*guard against callers passing in null */
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return;
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if (!pm_qos_request_active(req)) {
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WARN(1, KERN_ERR "pm_qos_update_request() called for unknown object\n");
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return;
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}
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trace_pm_qos_update_request(PM_QOS_CPU_DMA_LATENCY, new_value);
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if (new_value == req->node.prio)
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return;
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cpu_latency_qos_update(req, PM_QOS_UPDATE_REQ, new_value);
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}
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EXPORT_SYMBOL_GPL(pm_qos_update_request);
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/**
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* 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 for PM_QOS_CPU_DMA_LATENCY. Call this
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* on slow code paths.
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*/
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void pm_qos_remove_request(struct pm_qos_request *req)
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{
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if (!req) /*guard against callers passing in null */
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return;
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/* silent return to keep pcm code cleaner */
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if (!pm_qos_request_active(req)) {
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WARN(1, KERN_ERR "pm_qos_remove_request() called for unknown object\n");
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return;
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}
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trace_pm_qos_remove_request(PM_QOS_CPU_DMA_LATENCY, PM_QOS_DEFAULT_VALUE);
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cpu_latency_qos_update(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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EXPORT_SYMBOL_GPL(pm_qos_remove_request);
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/* User space interface to the CPU latency QoS via misc device. */
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static int cpu_latency_qos_open(struct inode *inode, struct file *filp)
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{
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struct pm_qos_request *req;
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req = kzalloc(sizeof(*req), GFP_KERNEL);
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if (!req)
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return -ENOMEM;
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pm_qos_add_request(req, PM_QOS_CPU_DMA_LATENCY, PM_QOS_DEFAULT_VALUE);
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filp->private_data = req;
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return 0;
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}
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static int cpu_latency_qos_release(struct inode *inode, struct file *filp)
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{
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struct pm_qos_request *req = filp->private_data;
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filp->private_data = NULL;
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pm_qos_remove_request(req);
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kfree(req);
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return 0;
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}
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static ssize_t cpu_latency_qos_read(struct file *filp, char __user *buf,
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size_t count, loff_t *f_pos)
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{
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struct pm_qos_request *req = filp->private_data;
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unsigned long flags;
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s32 value;
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if (!req || !pm_qos_request_active(req))
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return -EINVAL;
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spin_lock_irqsave(&pm_qos_lock, flags);
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value = pm_qos_get_value(&cpu_latency_constraints);
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spin_unlock_irqrestore(&pm_qos_lock, flags);
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return simple_read_from_buffer(buf, count, f_pos, &value, sizeof(s32));
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}
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static ssize_t cpu_latency_qos_write(struct file *filp, const char __user *buf,
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size_t count, loff_t *f_pos)
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{
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s32 value;
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if (count == sizeof(s32)) {
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if (copy_from_user(&value, buf, sizeof(s32)))
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return -EFAULT;
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} else {
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int ret;
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ret = kstrtos32_from_user(buf, count, 16, &value);
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if (ret)
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return ret;
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}
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pm_qos_update_request(filp->private_data, value);
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return count;
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}
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static const struct file_operations cpu_latency_qos_fops = {
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.write = cpu_latency_qos_write,
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.read = cpu_latency_qos_read,
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.open = cpu_latency_qos_open,
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.release = cpu_latency_qos_release,
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.llseek = noop_llseek,
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};
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static struct miscdevice cpu_latency_qos_miscdev = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = "cpu_dma_latency",
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.fops = &cpu_latency_qos_fops,
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};
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static int __init cpu_latency_qos_init(void)
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{
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int ret;
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ret = misc_register(&cpu_latency_qos_miscdev);
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if (ret < 0)
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pr_err("%s: %s setup failed\n", __func__,
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cpu_latency_qos_miscdev.name);
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return ret;
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}
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late_initcall(cpu_latency_qos_init);
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/* Definitions related to the frequency QoS below. */
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/**
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* freq_constraints_init - Initialize frequency QoS constraints.
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* @qos: Frequency QoS constraints to initialize.
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*/
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void freq_constraints_init(struct freq_constraints *qos)
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{
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struct pm_qos_constraints *c;
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c = &qos->min_freq;
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plist_head_init(&c->list);
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c->target_value = FREQ_QOS_MIN_DEFAULT_VALUE;
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c->default_value = FREQ_QOS_MIN_DEFAULT_VALUE;
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c->no_constraint_value = FREQ_QOS_MIN_DEFAULT_VALUE;
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c->type = PM_QOS_MAX;
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c->notifiers = &qos->min_freq_notifiers;
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BLOCKING_INIT_NOTIFIER_HEAD(c->notifiers);
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c = &qos->max_freq;
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plist_head_init(&c->list);
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c->target_value = FREQ_QOS_MAX_DEFAULT_VALUE;
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c->default_value = FREQ_QOS_MAX_DEFAULT_VALUE;
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c->no_constraint_value = FREQ_QOS_MAX_DEFAULT_VALUE;
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c->type = PM_QOS_MIN;
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c->notifiers = &qos->max_freq_notifiers;
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BLOCKING_INIT_NOTIFIER_HEAD(c->notifiers);
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}
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/**
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* freq_qos_read_value - Get frequency QoS constraint for a given list.
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* @qos: Constraints to evaluate.
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* @type: QoS request type.
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*/
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s32 freq_qos_read_value(struct freq_constraints *qos,
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enum freq_qos_req_type type)
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{
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s32 ret;
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switch (type) {
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case FREQ_QOS_MIN:
|
|
ret = IS_ERR_OR_NULL(qos) ?
|
|
FREQ_QOS_MIN_DEFAULT_VALUE :
|
|
pm_qos_read_value(&qos->min_freq);
|
|
break;
|
|
case FREQ_QOS_MAX:
|
|
ret = IS_ERR_OR_NULL(qos) ?
|
|
FREQ_QOS_MAX_DEFAULT_VALUE :
|
|
pm_qos_read_value(&qos->max_freq);
|
|
break;
|
|
default:
|
|
WARN_ON(1);
|
|
ret = 0;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* freq_qos_apply - Add/modify/remove frequency QoS request.
|
|
* @req: Constraint request to apply.
|
|
* @action: Action to perform (add/update/remove).
|
|
* @value: Value to assign to the QoS request.
|
|
*
|
|
* This is only meant to be called from inside pm_qos, not drivers.
|
|
*/
|
|
int freq_qos_apply(struct freq_qos_request *req,
|
|
enum pm_qos_req_action action, s32 value)
|
|
{
|
|
int ret;
|
|
|
|
switch(req->type) {
|
|
case FREQ_QOS_MIN:
|
|
ret = pm_qos_update_target(&req->qos->min_freq, &req->pnode,
|
|
action, value);
|
|
break;
|
|
case FREQ_QOS_MAX:
|
|
ret = pm_qos_update_target(&req->qos->max_freq, &req->pnode,
|
|
action, value);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* freq_qos_add_request - Insert new frequency QoS request into a given list.
|
|
* @qos: Constraints to update.
|
|
* @req: Preallocated request object.
|
|
* @type: Request type.
|
|
* @value: Request value.
|
|
*
|
|
* Insert a new entry into the @qos list of requests, recompute the effective
|
|
* QoS constraint value for that list and initialize the @req object. The
|
|
* caller needs to save that object for later use in updates and removal.
|
|
*
|
|
* Return 1 if the effective constraint value has changed, 0 if the effective
|
|
* constraint value has not changed, or a negative error code on failures.
|
|
*/
|
|
int freq_qos_add_request(struct freq_constraints *qos,
|
|
struct freq_qos_request *req,
|
|
enum freq_qos_req_type type, s32 value)
|
|
{
|
|
int ret;
|
|
|
|
if (IS_ERR_OR_NULL(qos) || !req)
|
|
return -EINVAL;
|
|
|
|
if (WARN(freq_qos_request_active(req),
|
|
"%s() called for active request\n", __func__))
|
|
return -EINVAL;
|
|
|
|
req->qos = qos;
|
|
req->type = type;
|
|
ret = freq_qos_apply(req, PM_QOS_ADD_REQ, value);
|
|
if (ret < 0) {
|
|
req->qos = NULL;
|
|
req->type = 0;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(freq_qos_add_request);
|
|
|
|
/**
|
|
* freq_qos_update_request - Modify existing frequency QoS request.
|
|
* @req: Request to modify.
|
|
* @new_value: New request value.
|
|
*
|
|
* Update an existing frequency QoS request along with the effective constraint
|
|
* value for the list of requests it belongs to.
|
|
*
|
|
* Return 1 if the effective constraint value has changed, 0 if the effective
|
|
* constraint value has not changed, or a negative error code on failures.
|
|
*/
|
|
int freq_qos_update_request(struct freq_qos_request *req, s32 new_value)
|
|
{
|
|
if (!req)
|
|
return -EINVAL;
|
|
|
|
if (WARN(!freq_qos_request_active(req),
|
|
"%s() called for unknown object\n", __func__))
|
|
return -EINVAL;
|
|
|
|
if (req->pnode.prio == new_value)
|
|
return 0;
|
|
|
|
return freq_qos_apply(req, PM_QOS_UPDATE_REQ, new_value);
|
|
}
|
|
EXPORT_SYMBOL_GPL(freq_qos_update_request);
|
|
|
|
/**
|
|
* freq_qos_remove_request - Remove frequency QoS request from its list.
|
|
* @req: Request to remove.
|
|
*
|
|
* Remove the given frequency QoS request from the list of constraints it
|
|
* belongs to and recompute the effective constraint value for that list.
|
|
*
|
|
* Return 1 if the effective constraint value has changed, 0 if the effective
|
|
* constraint value has not changed, or a negative error code on failures.
|
|
*/
|
|
int freq_qos_remove_request(struct freq_qos_request *req)
|
|
{
|
|
int ret;
|
|
|
|
if (!req)
|
|
return -EINVAL;
|
|
|
|
if (WARN(!freq_qos_request_active(req),
|
|
"%s() called for unknown object\n", __func__))
|
|
return -EINVAL;
|
|
|
|
ret = freq_qos_apply(req, PM_QOS_REMOVE_REQ, PM_QOS_DEFAULT_VALUE);
|
|
req->qos = NULL;
|
|
req->type = 0;
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(freq_qos_remove_request);
|
|
|
|
/**
|
|
* freq_qos_add_notifier - Add frequency QoS change notifier.
|
|
* @qos: List of requests to add the notifier to.
|
|
* @type: Request type.
|
|
* @notifier: Notifier block to add.
|
|
*/
|
|
int freq_qos_add_notifier(struct freq_constraints *qos,
|
|
enum freq_qos_req_type type,
|
|
struct notifier_block *notifier)
|
|
{
|
|
int ret;
|
|
|
|
if (IS_ERR_OR_NULL(qos) || !notifier)
|
|
return -EINVAL;
|
|
|
|
switch (type) {
|
|
case FREQ_QOS_MIN:
|
|
ret = blocking_notifier_chain_register(qos->min_freq.notifiers,
|
|
notifier);
|
|
break;
|
|
case FREQ_QOS_MAX:
|
|
ret = blocking_notifier_chain_register(qos->max_freq.notifiers,
|
|
notifier);
|
|
break;
|
|
default:
|
|
WARN_ON(1);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(freq_qos_add_notifier);
|
|
|
|
/**
|
|
* freq_qos_remove_notifier - Remove frequency QoS change notifier.
|
|
* @qos: List of requests to remove the notifier from.
|
|
* @type: Request type.
|
|
* @notifier: Notifier block to remove.
|
|
*/
|
|
int freq_qos_remove_notifier(struct freq_constraints *qos,
|
|
enum freq_qos_req_type type,
|
|
struct notifier_block *notifier)
|
|
{
|
|
int ret;
|
|
|
|
if (IS_ERR_OR_NULL(qos) || !notifier)
|
|
return -EINVAL;
|
|
|
|
switch (type) {
|
|
case FREQ_QOS_MIN:
|
|
ret = blocking_notifier_chain_unregister(qos->min_freq.notifiers,
|
|
notifier);
|
|
break;
|
|
case FREQ_QOS_MAX:
|
|
ret = blocking_notifier_chain_unregister(qos->max_freq.notifiers,
|
|
notifier);
|
|
break;
|
|
default:
|
|
WARN_ON(1);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(freq_qos_remove_notifier);
|