diff options
Diffstat (limited to 'drivers/base/power/opp/core.c')
| -rw-r--r-- | drivers/base/power/opp/core.c | 276 |
1 files changed, 5 insertions, 271 deletions
diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c index aeff1cfb46f2..a731fa66e504 100644 --- a/drivers/base/power/opp/core.c +++ b/drivers/base/power/opp/core.c @@ -11,131 +11,14 @@ * published by the Free Software Foundation. */ -#include <linux/cpu.h> -#include <linux/kernel.h> #include <linux/errno.h> #include <linux/err.h> #include <linux/slab.h> #include <linux/device.h> -#include <linux/list.h> -#include <linux/rculist.h> -#include <linux/rcupdate.h> -#include <linux/pm_opp.h> #include <linux/of.h> #include <linux/export.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; -}; +#include "opp.h" /* * The root of the list of all devices. All device_opp structures branch off @@ -200,7 +83,7 @@ static struct device_opp *_managed_opp(const struct device_node *np) * is a RCU protected pointer. This means that device_opp is valid as long * as we are under RCU lock. */ -static struct device_opp *_find_device_opp(struct device *dev) +struct device_opp *_find_device_opp(struct device *dev) { struct device_opp *dev_opp; @@ -579,8 +462,8 @@ static void _remove_list_dev(struct device_list_opp *list_dev, _kfree_list_dev_rcu); } -static struct device_list_opp *_add_list_dev(const struct device *dev, - struct device_opp *dev_opp) +struct device_list_opp *_add_list_dev(const struct device *dev, + struct device_opp *dev_opp) { struct device_list_opp *list_dev; @@ -1262,28 +1145,8 @@ unlock: } EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table); -void dev_pm_opp_of_cpumask_remove_table(cpumask_var_t cpumask) -{ - struct device *cpu_dev; - int cpu; - - 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; - } - - dev_pm_opp_of_remove_table(cpu_dev); - } -} -EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table); - /* Returns opp descriptor node for a device, caller must do of_node_put() */ -static struct device_node *_of_get_opp_desc_node(struct device *dev) +struct device_node *_of_get_opp_desc_node(struct device *dev) { /* * TODO: Support for multiple OPP tables. @@ -1427,133 +1290,4 @@ int dev_pm_opp_of_add_table(struct device *dev) return ret; } EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table); - -int dev_pm_opp_of_cpumask_add_table(cpumask_var_t cpumask) -{ - struct device *cpu_dev; - int cpu, ret = 0; - - 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); - -/* Required only for V1 bindings, as v2 can manage it from DT itself */ -int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, cpumask_var_t cpumask) -{ - struct device_list_opp *list_dev; - struct device_opp *dev_opp; - struct device *dev; - int cpu, ret = 0; - - rcu_read_lock(); - - dev_opp = _find_device_opp(cpu_dev); - if (IS_ERR(dev_opp)) { - ret = -EINVAL; - goto out_rcu_read_unlock; - } - - for_each_cpu(cpu, cpumask) { - if (cpu == cpu_dev->id) - continue; - - dev = get_cpu_device(cpu); - if (!dev) { - dev_err(cpu_dev, "%s: failed to get cpu%d device\n", - __func__, cpu); - continue; - } - - list_dev = _add_list_dev(dev, dev_opp); - if (!list_dev) { - dev_err(dev, "%s: failed to add list-dev for cpu%d device\n", - __func__, cpu); - continue; - } - } -out_rcu_read_unlock: - rcu_read_unlock(); - - return 0; -} -EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus); - -/* - * 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 |
