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922ff0759a
dev_pm_opp_remove_table() should drop a reference to the OPP table only
if the DT OPP table was parsed earlier with a call to
dev_pm_opp_of_add_table() earlier. Else it may end up dropping the
reference to the OPP table, which was added as a result of other calls
like dev_pm_opp_set_clkname(). And would hence result in undesirable
behavior later on when caller would try to free the resource again.
Fixes: 03758d6026 ("opp: Replace list_kref with a local counter")
Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Reported-by: Anders Roxell <anders.roxell@linaro.org>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
264 lines
8.9 KiB
C
264 lines
8.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Generic OPP Interface
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*
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* Copyright (C) 2009-2010 Texas Instruments Incorporated.
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* Nishanth Menon
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* Romit Dasgupta
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* Kevin Hilman
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*/
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#ifndef __DRIVER_OPP_H__
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#define __DRIVER_OPP_H__
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#include <linux/device.h>
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#include <linux/interconnect.h>
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#include <linux/kernel.h>
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#include <linux/kref.h>
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#include <linux/list.h>
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#include <linux/limits.h>
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#include <linux/pm_opp.h>
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#include <linux/notifier.h>
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struct clk;
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struct regulator;
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/* Lock to allow exclusive modification to the device and opp lists */
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extern struct mutex opp_table_lock;
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extern struct list_head opp_tables;
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/*
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* Internal data structure organization with the OPP layer library is as
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* follows:
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* opp_tables (root)
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* |- device 1 (represents voltage domain 1)
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* | |- opp 1 (availability, freq, voltage)
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* | |- opp 2 ..
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* ... ...
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* | `- opp n ..
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* |- device 2 (represents the next voltage domain)
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* ...
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* `- device m (represents mth voltage domain)
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* device 1, 2.. are represented by opp_table structure while each opp
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* is represented by the opp structure.
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*/
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/**
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* struct dev_pm_opp - Generic OPP description structure
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* @node: opp table node. The nodes are maintained throughout the lifetime
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* of boot. It is expected only an optimal set of OPPs are
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* added to the library by the SoC framework.
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* IMPORTANT: the opp nodes should be maintained in increasing
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* order.
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* @kref: for reference count of the OPP.
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* @available: true/false - marks if this OPP as available or not
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* @dynamic: not-created from static DT entries.
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* @turbo: true if turbo (boost) OPP
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* @suspend: true if suspend OPP
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* @pstate: Device's power domain's performance state.
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* @rate: Frequency in hertz
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* @level: Performance level
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* @supplies: Power supplies voltage/current values
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* @bandwidth: Interconnect bandwidth values
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* @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's
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* frequency from any other OPP's frequency.
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* @required_opps: List of OPPs that are required by this OPP.
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* @opp_table: points back to the opp_table struct this opp belongs to
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* @np: OPP's device node.
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* @dentry: debugfs dentry pointer (per opp)
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*
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* This structure stores the OPP information for a given device.
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*/
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struct dev_pm_opp {
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struct list_head node;
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struct kref kref;
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bool available;
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bool dynamic;
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bool turbo;
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bool suspend;
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unsigned int pstate;
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unsigned long rate;
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unsigned int level;
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struct dev_pm_opp_supply *supplies;
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struct dev_pm_opp_icc_bw *bandwidth;
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unsigned long clock_latency_ns;
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struct dev_pm_opp **required_opps;
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struct opp_table *opp_table;
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struct device_node *np;
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#ifdef CONFIG_DEBUG_FS
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struct dentry *dentry;
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#endif
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};
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/**
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* struct opp_device - devices managed by 'struct opp_table'
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* @node: list node
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* @dev: device to which the struct object belongs
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* @dentry: debugfs dentry pointer (per device)
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*
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* This is an internal data structure maintaining the devices that are managed
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* by 'struct opp_table'.
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*/
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struct opp_device {
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struct list_head node;
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const struct device *dev;
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#ifdef CONFIG_DEBUG_FS
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struct dentry *dentry;
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#endif
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};
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enum opp_table_access {
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OPP_TABLE_ACCESS_UNKNOWN = 0,
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OPP_TABLE_ACCESS_EXCLUSIVE = 1,
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OPP_TABLE_ACCESS_SHARED = 2,
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};
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/**
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* struct opp_table - Device opp structure
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* @node: table node - contains the devices with OPPs that
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* have been registered. Nodes once added are not modified in this
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* table.
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* @head: notifier head to notify the OPP availability changes.
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* @dev_list: list of devices that share these OPPs
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* @opp_list: table of opps
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* @kref: for reference count of the table.
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* @lock: mutex protecting the opp_list and dev_list.
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* @np: struct device_node pointer for opp's DT node.
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* @clock_latency_ns_max: Max clock latency in nanoseconds.
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* @parsed_static_opps: Count of devices for which OPPs are initialized from DT.
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* @shared_opp: OPP is shared between multiple devices.
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* @suspend_opp: Pointer to OPP to be used during device suspend.
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* @genpd_virt_dev_lock: Mutex protecting the genpd virtual device pointers.
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* @genpd_virt_devs: List of virtual devices for multiple genpd support.
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* @required_opp_tables: List of device OPP tables that are required by OPPs in
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* this table.
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* @required_opp_count: Number of required devices.
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* @supported_hw: Array of version number to support.
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* @supported_hw_count: Number of elements in supported_hw array.
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* @prop_name: A name to postfix to many DT properties, while parsing them.
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* @clk: Device's clock handle
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* @regulators: Supply regulators
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* @regulator_count: Number of power supply regulators. Its value can be -1
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* @regulator_enabled: Set to true if regulators were previously enabled.
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* (uninitialized), 0 (no opp-microvolt property) or > 0 (has opp-microvolt
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* property).
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* @paths: Interconnect path handles
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* @path_count: Number of interconnect paths
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* @genpd_performance_state: Device's power domain support performance state.
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* @is_genpd: Marks if the OPP table belongs to a genpd.
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* @set_opp: Platform specific set_opp callback
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* @set_opp_data: Data to be passed to set_opp callback
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* @dentry: debugfs dentry pointer of the real device directory (not links).
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* @dentry_name: Name of the real dentry.
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*
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* @voltage_tolerance_v1: In percentage, for v1 bindings only.
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*
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* This is an internal data structure maintaining the link to opps attached to
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* a device. This structure is not meant to be shared to users as it is
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* meant for book keeping and private to OPP library.
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*/
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struct opp_table {
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struct list_head node;
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struct blocking_notifier_head head;
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struct list_head dev_list;
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struct list_head opp_list;
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struct kref kref;
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struct mutex lock;
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struct device_node *np;
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unsigned long clock_latency_ns_max;
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/* For backward compatibility with v1 bindings */
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unsigned int voltage_tolerance_v1;
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unsigned int parsed_static_opps;
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enum opp_table_access shared_opp;
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struct dev_pm_opp *suspend_opp;
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struct mutex genpd_virt_dev_lock;
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struct device **genpd_virt_devs;
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struct opp_table **required_opp_tables;
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unsigned int required_opp_count;
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unsigned int *supported_hw;
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unsigned int supported_hw_count;
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const char *prop_name;
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struct clk *clk;
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struct regulator **regulators;
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int regulator_count;
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bool regulator_enabled;
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struct icc_path **paths;
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unsigned int path_count;
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bool genpd_performance_state;
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bool is_genpd;
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int (*set_opp)(struct dev_pm_set_opp_data *data);
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struct dev_pm_set_opp_data *set_opp_data;
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#ifdef CONFIG_DEBUG_FS
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struct dentry *dentry;
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char dentry_name[NAME_MAX];
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#endif
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};
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/* Routines internal to opp core */
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void dev_pm_opp_get(struct dev_pm_opp *opp);
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bool _opp_remove_all_static(struct opp_table *opp_table);
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void _get_opp_table_kref(struct opp_table *opp_table);
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int _get_opp_count(struct opp_table *opp_table);
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struct opp_table *_find_opp_table(struct device *dev);
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struct opp_device *_add_opp_dev(const struct device *dev, struct opp_table *opp_table);
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void _dev_pm_opp_find_and_remove_table(struct device *dev);
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struct dev_pm_opp *_opp_allocate(struct opp_table *opp_table);
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void _opp_free(struct dev_pm_opp *opp);
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int _opp_compare_key(struct dev_pm_opp *opp1, struct dev_pm_opp *opp2);
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int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, struct opp_table *opp_table, bool rate_not_available);
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int _opp_add_v1(struct opp_table *opp_table, struct device *dev, unsigned long freq, long u_volt, bool dynamic);
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void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, int last_cpu);
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struct opp_table *_add_opp_table(struct device *dev);
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void _put_opp_list_kref(struct opp_table *opp_table);
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#ifdef CONFIG_OF
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void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index);
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void _of_clear_opp_table(struct opp_table *opp_table);
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struct opp_table *_managed_opp(struct device *dev, int index);
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void _of_opp_free_required_opps(struct opp_table *opp_table,
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struct dev_pm_opp *opp);
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#else
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static inline void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index) {}
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static inline void _of_clear_opp_table(struct opp_table *opp_table) {}
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static inline struct opp_table *_managed_opp(struct device *dev, int index) { return NULL; }
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static inline void _of_opp_free_required_opps(struct opp_table *opp_table,
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struct dev_pm_opp *opp) {}
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#endif
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#ifdef CONFIG_DEBUG_FS
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void opp_debug_remove_one(struct dev_pm_opp *opp);
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void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table);
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void opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table);
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void opp_debug_unregister(struct opp_device *opp_dev, struct opp_table *opp_table);
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#else
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static inline void opp_debug_remove_one(struct dev_pm_opp *opp) {}
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static inline void opp_debug_create_one(struct dev_pm_opp *opp,
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struct opp_table *opp_table) { }
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static inline void opp_debug_register(struct opp_device *opp_dev,
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struct opp_table *opp_table) { }
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static inline void opp_debug_unregister(struct opp_device *opp_dev,
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struct opp_table *opp_table)
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{ }
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#endif /* DEBUG_FS */
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#endif /* __DRIVER_OPP_H__ */
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