PM / OPP: Move cpu specific code to opp/cpu.c
Move cpu device specific code out of generic opp library, and add it to cpu.c. Along with that, create a core-internal opp.h header, which will be used to share structures and function prototypes within opp core. Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Viresh Kumar
Rafael J. Wysocki
Родитель
33692dc381
Коммит
f59d3ee848
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@ -11,131 +11,14 @@
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* published by the Free Software Foundation.
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*/
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#include <linux/cpu.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/device.h>
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#include <linux/list.h>
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#include <linux/rculist.h>
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#include <linux/rcupdate.h>
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#include <linux/pm_opp.h>
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#include <linux/of.h>
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#include <linux/export.h>
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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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* dev_opp_list (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 dev_opp 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 list 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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* RCU usage: opp list is traversed with RCU locks. node
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* modification is possible realtime, hence the modifications
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* are protected by the dev_opp_list_lock for integrity.
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* IMPORTANT: the opp nodes should be maintained in increasing
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* order.
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* @dynamic: not-created from static DT entries.
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* @available: true/false - marks if this OPP as available or not
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* @turbo: true if turbo (boost) OPP
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* @rate: Frequency in hertz
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* @u_volt: Target voltage in microvolts corresponding to this OPP
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* @u_volt_min: Minimum voltage in microvolts corresponding to this OPP
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* @u_volt_max: Maximum voltage in microvolts corresponding to this OPP
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* @u_amp: Maximum current drawn by the device in microamperes
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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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* @dev_opp: points back to the device_opp struct this opp belongs to
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* @rcu_head: RCU callback head used for deferred freeing
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* @np: OPP's device node.
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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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bool available;
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bool dynamic;
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bool turbo;
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unsigned long rate;
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unsigned long u_volt;
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unsigned long u_volt_min;
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unsigned long u_volt_max;
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unsigned long u_amp;
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unsigned long clock_latency_ns;
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struct device_opp *dev_opp;
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struct rcu_head rcu_head;
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struct device_node *np;
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};
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/**
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* struct device_list_opp - devices managed by 'struct device_opp'
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* @node: list node
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* @dev: device to which the struct object belongs
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* @rcu_head: RCU callback head used for deferred freeing
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*
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* This is an internal data structure maintaining the list of devices that are
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* managed by 'struct device_opp'.
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*/
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struct device_list_opp {
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struct list_head node;
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const struct device *dev;
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struct rcu_head rcu_head;
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};
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/**
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* struct device_opp - Device opp structure
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* @node: list 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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* list.
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* RCU usage: nodes are not modified in the list of device_opp,
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* however addition is possible and is secured by dev_opp_list_lock
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* @srcu_head: notifier head to notify the OPP availability changes.
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* @rcu_head: RCU callback head used for deferred freeing
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* @dev_list: list of devices that share these OPPs
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* @opp_list: list of opps
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* @np: struct device_node pointer for opp's DT node.
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* @shared_opp: OPP is shared between multiple devices.
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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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* Because the opp structures can be used from both rcu and srcu readers, we
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* need to wait for the grace period of both of them before freeing any
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* resources. And so we have used kfree_rcu() from within call_srcu() handlers.
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*/
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struct device_opp {
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struct list_head node;
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struct srcu_notifier_head srcu_head;
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struct rcu_head rcu_head;
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struct list_head dev_list;
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struct list_head opp_list;
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struct device_node *np;
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unsigned long clock_latency_ns_max;
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bool shared_opp;
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struct dev_pm_opp *suspend_opp;
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};
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#include "opp.h"
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/*
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* The root of the list of all devices. All device_opp structures branch off
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@ -200,7 +83,7 @@ static struct device_opp *_managed_opp(const struct device_node *np)
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* is a RCU protected pointer. This means that device_opp is valid as long
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* as we are under RCU lock.
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*/
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static struct device_opp *_find_device_opp(struct device *dev)
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struct device_opp *_find_device_opp(struct device *dev)
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{
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struct device_opp *dev_opp;
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@ -579,8 +462,8 @@ static void _remove_list_dev(struct device_list_opp *list_dev,
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_kfree_list_dev_rcu);
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}
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static struct device_list_opp *_add_list_dev(const struct device *dev,
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struct device_opp *dev_opp)
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struct device_list_opp *_add_list_dev(const struct device *dev,
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struct device_opp *dev_opp)
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{
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struct device_list_opp *list_dev;
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@ -1262,28 +1145,8 @@ unlock:
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table);
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void dev_pm_opp_of_cpumask_remove_table(cpumask_var_t cpumask)
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{
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struct device *cpu_dev;
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int cpu;
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WARN_ON(cpumask_empty(cpumask));
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for_each_cpu(cpu, cpumask) {
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cpu_dev = get_cpu_device(cpu);
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if (!cpu_dev) {
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pr_err("%s: failed to get cpu%d device\n", __func__,
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cpu);
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continue;
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}
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dev_pm_opp_of_remove_table(cpu_dev);
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}
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table);
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/* Returns opp descriptor node for a device, caller must do of_node_put() */
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static struct device_node *_of_get_opp_desc_node(struct device *dev)
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struct device_node *_of_get_opp_desc_node(struct device *dev)
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{
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/*
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* TODO: Support for multiple OPP tables.
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@ -1427,133 +1290,4 @@ int dev_pm_opp_of_add_table(struct device *dev)
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return ret;
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table);
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int dev_pm_opp_of_cpumask_add_table(cpumask_var_t cpumask)
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{
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struct device *cpu_dev;
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int cpu, ret = 0;
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WARN_ON(cpumask_empty(cpumask));
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for_each_cpu(cpu, cpumask) {
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cpu_dev = get_cpu_device(cpu);
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if (!cpu_dev) {
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pr_err("%s: failed to get cpu%d device\n", __func__,
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cpu);
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continue;
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}
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ret = dev_pm_opp_of_add_table(cpu_dev);
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if (ret) {
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pr_err("%s: couldn't find opp table for cpu:%d, %d\n",
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__func__, cpu, ret);
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/* Free all other OPPs */
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dev_pm_opp_of_cpumask_remove_table(cpumask);
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break;
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}
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table);
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/* Required only for V1 bindings, as v2 can manage it from DT itself */
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int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask)
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{
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struct device_list_opp *list_dev;
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struct device_opp *dev_opp;
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struct device *dev;
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int cpu, ret = 0;
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rcu_read_lock();
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dev_opp = _find_device_opp(cpu_dev);
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if (IS_ERR(dev_opp)) {
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ret = -EINVAL;
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goto out_rcu_read_unlock;
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}
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for_each_cpu(cpu, cpumask) {
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if (cpu == cpu_dev->id)
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continue;
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dev = get_cpu_device(cpu);
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if (!dev) {
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dev_err(cpu_dev, "%s: failed to get cpu%d device\n",
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__func__, cpu);
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continue;
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}
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list_dev = _add_list_dev(dev, dev_opp);
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if (!list_dev) {
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dev_err(dev, "%s: failed to add list-dev for cpu%d device\n",
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__func__, cpu);
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continue;
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}
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}
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out_rcu_read_unlock:
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rcu_read_unlock();
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return 0;
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus);
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/*
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* Works only for OPP v2 bindings.
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*
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* cpumask should be already set to mask of cpu_dev->id.
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* Returns -ENOENT if operating-points-v2 bindings aren't supported.
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*/
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int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask)
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{
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struct device_node *np, *tmp_np;
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struct device *tcpu_dev;
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int cpu, ret = 0;
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/* Get OPP descriptor node */
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np = _of_get_opp_desc_node(cpu_dev);
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if (!np) {
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dev_dbg(cpu_dev, "%s: Couldn't find opp node: %ld\n", __func__,
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PTR_ERR(np));
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return -ENOENT;
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}
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/* OPPs are shared ? */
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if (!of_property_read_bool(np, "opp-shared"))
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goto put_cpu_node;
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for_each_possible_cpu(cpu) {
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if (cpu == cpu_dev->id)
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continue;
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tcpu_dev = get_cpu_device(cpu);
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if (!tcpu_dev) {
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dev_err(cpu_dev, "%s: failed to get cpu%d device\n",
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__func__, cpu);
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ret = -ENODEV;
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goto put_cpu_node;
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}
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/* Get OPP descriptor node */
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tmp_np = _of_get_opp_desc_node(tcpu_dev);
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if (!tmp_np) {
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dev_err(tcpu_dev, "%s: Couldn't find opp node: %ld\n",
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__func__, PTR_ERR(tmp_np));
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ret = PTR_ERR(tmp_np);
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goto put_cpu_node;
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}
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/* CPUs are sharing opp node */
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if (np == tmp_np)
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cpumask_set_cpu(cpu, cpumask);
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of_node_put(tmp_np);
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}
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put_cpu_node:
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of_node_put(np);
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return ret;
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus);
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#endif
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@ -10,17 +10,18 @@
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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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#include <linux/cpu.h>
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#include <linux/cpufreq.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/pm_opp.h>
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#include <linux/rcupdate.h>
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#include <linux/of.h>
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#include <linux/slab.h>
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#include "opp.h"
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#ifdef CONFIG_CPU_FREQ
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/**
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* dev_pm_opp_init_cpufreq_table() - create a cpufreq table for a device
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* @dev: device for which we do this operation
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@ -114,3 +115,154 @@ void dev_pm_opp_free_cpufreq_table(struct device *dev,
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_free_cpufreq_table);
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#endif /* CONFIG_CPU_FREQ */
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/* Required only for V1 bindings, as v2 can manage it from DT itself */
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int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask)
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{
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struct device_list_opp *list_dev;
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struct device_opp *dev_opp;
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struct device *dev;
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int cpu, ret = 0;
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rcu_read_lock();
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dev_opp = _find_device_opp(cpu_dev);
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if (IS_ERR(dev_opp)) {
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ret = -EINVAL;
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goto out_rcu_read_unlock;
|
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}
|
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|
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for_each_cpu(cpu, cpumask) {
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if (cpu == cpu_dev->id)
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continue;
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dev = get_cpu_device(cpu);
|
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if (!dev) {
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dev_err(cpu_dev, "%s: failed to get cpu%d device\n",
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__func__, cpu);
|
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continue;
|
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}
|
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|
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list_dev = _add_list_dev(dev, dev_opp);
|
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if (!list_dev) {
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dev_err(dev, "%s: failed to add list-dev for cpu%d device\n",
|
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__func__, cpu);
|
||||
continue;
|
||||
}
|
||||
}
|
||||
out_rcu_read_unlock:
|
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rcu_read_unlock();
|
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|
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return 0;
|
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}
|
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EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus);
|
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|
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#ifdef CONFIG_OF
|
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void dev_pm_opp_of_cpumask_remove_table(cpumask_var_t cpumask)
|
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{
|
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struct device *cpu_dev;
|
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int cpu;
|
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|
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WARN_ON(cpumask_empty(cpumask));
|
||||
|
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for_each_cpu(cpu, cpumask) {
|
||||
cpu_dev = get_cpu_device(cpu);
|
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if (!cpu_dev) {
|
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pr_err("%s: failed to get cpu%d device\n", __func__,
|
||||
cpu);
|
||||
continue;
|
||||
}
|
||||
|
||||
dev_pm_opp_of_remove_table(cpu_dev);
|
||||
}
|
||||
}
|
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EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table);
|
||||
|
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int dev_pm_opp_of_cpumask_add_table(cpumask_var_t cpumask)
|
||||
{
|
||||
struct device *cpu_dev;
|
||||
int cpu, ret = 0;
|
||||
|
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WARN_ON(cpumask_empty(cpumask));
|
||||
|
||||
for_each_cpu(cpu, cpumask) {
|
||||
cpu_dev = get_cpu_device(cpu);
|
||||
if (!cpu_dev) {
|
||||
pr_err("%s: failed to get cpu%d device\n", __func__,
|
||||
cpu);
|
||||
continue;
|
||||
}
|
||||
|
||||
ret = dev_pm_opp_of_add_table(cpu_dev);
|
||||
if (ret) {
|
||||
pr_err("%s: couldn't find opp table for cpu:%d, %d\n",
|
||||
__func__, cpu, ret);
|
||||
|
||||
/* Free all other OPPs */
|
||||
dev_pm_opp_of_cpumask_remove_table(cpumask);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table);
|
||||
|
||||
/*
|
||||
* Works only for OPP v2 bindings.
|
||||
*
|
||||
* cpumask should be already set to mask of cpu_dev->id.
|
||||
* Returns -ENOENT if operating-points-v2 bindings aren't supported.
|
||||
*/
|
||||
int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask)
|
||||
{
|
||||
struct device_node *np, *tmp_np;
|
||||
struct device *tcpu_dev;
|
||||
int cpu, ret = 0;
|
||||
|
||||
/* Get OPP descriptor node */
|
||||
np = _of_get_opp_desc_node(cpu_dev);
|
||||
if (!np) {
|
||||
dev_dbg(cpu_dev, "%s: Couldn't find opp node: %ld\n", __func__,
|
||||
PTR_ERR(np));
|
||||
return -ENOENT;
|
||||
}
|
||||
|
||||
/* OPPs are shared ? */
|
||||
if (!of_property_read_bool(np, "opp-shared"))
|
||||
goto put_cpu_node;
|
||||
|
||||
for_each_possible_cpu(cpu) {
|
||||
if (cpu == cpu_dev->id)
|
||||
continue;
|
||||
|
||||
tcpu_dev = get_cpu_device(cpu);
|
||||
if (!tcpu_dev) {
|
||||
dev_err(cpu_dev, "%s: failed to get cpu%d device\n",
|
||||
__func__, cpu);
|
||||
ret = -ENODEV;
|
||||
goto put_cpu_node;
|
||||
}
|
||||
|
||||
/* Get OPP descriptor node */
|
||||
tmp_np = _of_get_opp_desc_node(tcpu_dev);
|
||||
if (!tmp_np) {
|
||||
dev_err(tcpu_dev, "%s: Couldn't find opp node: %ld\n",
|
||||
__func__, PTR_ERR(tmp_np));
|
||||
ret = PTR_ERR(tmp_np);
|
||||
goto put_cpu_node;
|
||||
}
|
||||
|
||||
/* CPUs are sharing opp node */
|
||||
if (np == tmp_np)
|
||||
cpumask_set_cpu(cpu, cpumask);
|
||||
|
||||
of_node_put(tmp_np);
|
||||
}
|
||||
|
||||
put_cpu_node:
|
||||
of_node_put(np);
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus);
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -0,0 +1,143 @@
|
|||
/*
|
||||
* Generic OPP Interface
|
||||
*
|
||||
* Copyright (C) 2009-2010 Texas Instruments Incorporated.
|
||||
* Nishanth Menon
|
||||
* Romit Dasgupta
|
||||
* Kevin Hilman
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#ifndef __DRIVER_OPP_H__
|
||||
#define __DRIVER_OPP_H__
|
||||
|
||||
#include <linux/device.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/list.h>
|
||||
#include <linux/pm_opp.h>
|
||||
#include <linux/rculist.h>
|
||||
#include <linux/rcupdate.h>
|
||||
|
||||
/*
|
||||
* Internal data structure organization with the OPP layer library is as
|
||||
* follows:
|
||||
* dev_opp_list (root)
|
||||
* |- device 1 (represents voltage domain 1)
|
||||
* | |- opp 1 (availability, freq, voltage)
|
||||
* | |- opp 2 ..
|
||||
* ... ...
|
||||
* | `- opp n ..
|
||||
* |- device 2 (represents the next voltage domain)
|
||||
* ...
|
||||
* `- device m (represents mth voltage domain)
|
||||
* device 1, 2.. are represented by dev_opp structure while each opp
|
||||
* is represented by the opp structure.
|
||||
*/
|
||||
|
||||
/**
|
||||
* struct dev_pm_opp - Generic OPP description structure
|
||||
* @node: opp list node. The nodes are maintained throughout the lifetime
|
||||
* of boot. It is expected only an optimal set of OPPs are
|
||||
* added to the library by the SoC framework.
|
||||
* RCU usage: opp list is traversed with RCU locks. node
|
||||
* modification is possible realtime, hence the modifications
|
||||
* are protected by the dev_opp_list_lock for integrity.
|
||||
* IMPORTANT: the opp nodes should be maintained in increasing
|
||||
* order.
|
||||
* @dynamic: not-created from static DT entries.
|
||||
* @available: true/false - marks if this OPP as available or not
|
||||
* @turbo: true if turbo (boost) OPP
|
||||
* @rate: Frequency in hertz
|
||||
* @u_volt: Target voltage in microvolts corresponding to this OPP
|
||||
* @u_volt_min: Minimum voltage in microvolts corresponding to this OPP
|
||||
* @u_volt_max: Maximum voltage in microvolts corresponding to this OPP
|
||||
* @u_amp: Maximum current drawn by the device in microamperes
|
||||
* @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's
|
||||
* frequency from any other OPP's frequency.
|
||||
* @dev_opp: points back to the device_opp struct this opp belongs to
|
||||
* @rcu_head: RCU callback head used for deferred freeing
|
||||
* @np: OPP's device node.
|
||||
*
|
||||
* This structure stores the OPP information for a given device.
|
||||
*/
|
||||
struct dev_pm_opp {
|
||||
struct list_head node;
|
||||
|
||||
bool available;
|
||||
bool dynamic;
|
||||
bool turbo;
|
||||
unsigned long rate;
|
||||
|
||||
unsigned long u_volt;
|
||||
unsigned long u_volt_min;
|
||||
unsigned long u_volt_max;
|
||||
unsigned long u_amp;
|
||||
unsigned long clock_latency_ns;
|
||||
|
||||
struct device_opp *dev_opp;
|
||||
struct rcu_head rcu_head;
|
||||
|
||||
struct device_node *np;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct device_list_opp - devices managed by 'struct device_opp'
|
||||
* @node: list node
|
||||
* @dev: device to which the struct object belongs
|
||||
* @rcu_head: RCU callback head used for deferred freeing
|
||||
*
|
||||
* This is an internal data structure maintaining the list of devices that are
|
||||
* managed by 'struct device_opp'.
|
||||
*/
|
||||
struct device_list_opp {
|
||||
struct list_head node;
|
||||
const struct device *dev;
|
||||
struct rcu_head rcu_head;
|
||||
};
|
||||
|
||||
/**
|
||||
* struct device_opp - Device opp structure
|
||||
* @node: list node - contains the devices with OPPs that
|
||||
* have been registered. Nodes once added are not modified in this
|
||||
* list.
|
||||
* RCU usage: nodes are not modified in the list of device_opp,
|
||||
* however addition is possible and is secured by dev_opp_list_lock
|
||||
* @srcu_head: notifier head to notify the OPP availability changes.
|
||||
* @rcu_head: RCU callback head used for deferred freeing
|
||||
* @dev_list: list of devices that share these OPPs
|
||||
* @opp_list: list of opps
|
||||
* @np: struct device_node pointer for opp's DT node.
|
||||
* @shared_opp: OPP is shared between multiple devices.
|
||||
*
|
||||
* This is an internal data structure maintaining the link to opps attached to
|
||||
* a device. This structure is not meant to be shared to users as it is
|
||||
* meant for book keeping and private to OPP library.
|
||||
*
|
||||
* Because the opp structures can be used from both rcu and srcu readers, we
|
||||
* need to wait for the grace period of both of them before freeing any
|
||||
* resources. And so we have used kfree_rcu() from within call_srcu() handlers.
|
||||
*/
|
||||
struct device_opp {
|
||||
struct list_head node;
|
||||
|
||||
struct srcu_notifier_head srcu_head;
|
||||
struct rcu_head rcu_head;
|
||||
struct list_head dev_list;
|
||||
struct list_head opp_list;
|
||||
|
||||
struct device_node *np;
|
||||
unsigned long clock_latency_ns_max;
|
||||
bool shared_opp;
|
||||
struct dev_pm_opp *suspend_opp;
|
||||
};
|
||||
|
||||
/* Routines internal to opp core */
|
||||
struct device_opp *_find_device_opp(struct device *dev);
|
||||
struct device_list_opp *_add_list_dev(const struct device *dev,
|
||||
struct device_opp *dev_opp);
|
||||
struct device_node *_of_get_opp_desc_node(struct device *dev);
|
||||
|
||||
#endif /* __DRIVER_OPP_H__ */
|
||||
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