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c0356db7d1
While adding devices to their PM domains, dev_pm_qos_add_notifier() was invoked while allocating the generic_pm_domain_data for the device. Since the generic_pm_domain_data's device pointer will be assigned after allocation, the ->genpd_dev_pm_qos_notifier() callback could be called prior having a valid pointer to the device. Similar scenario existed while removing a device from a genpd. To cope with these scenarios a mutex was used to protect the pointer to the device. By re-order the sequence for when dev_pm_qos_add|remove_notifier() are invoked, we make sure the ->genpd_dev_pm_qos_notifier() callback are always called with a valid device pointer available. In this way, we eliminate the need for protecting the pointer and thus we can remove the mutex from the struct generic_pm_domain_data. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
327 lines
9.8 KiB
C
327 lines
9.8 KiB
C
/*
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* pm_domain.h - Definitions and headers related to device power domains.
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*
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* Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.
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*
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* This file is released under the GPLv2.
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*/
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#ifndef _LINUX_PM_DOMAIN_H
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#define _LINUX_PM_DOMAIN_H
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#include <linux/device.h>
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#include <linux/mutex.h>
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#include <linux/pm.h>
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#include <linux/err.h>
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#include <linux/of.h>
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#include <linux/notifier.h>
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#include <linux/cpuidle.h>
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/* Defines used for the flags field in the struct generic_pm_domain */
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#define GENPD_FLAG_PM_CLK (1U << 0) /* PM domain uses PM clk */
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enum gpd_status {
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GPD_STATE_ACTIVE = 0, /* PM domain is active */
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GPD_STATE_WAIT_MASTER, /* PM domain's master is being waited for */
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GPD_STATE_BUSY, /* Something is happening to the PM domain */
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GPD_STATE_REPEAT, /* Power off in progress, to be repeated */
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GPD_STATE_POWER_OFF, /* PM domain is off */
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};
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struct dev_power_governor {
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bool (*power_down_ok)(struct dev_pm_domain *domain);
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bool (*stop_ok)(struct device *dev);
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};
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struct gpd_dev_ops {
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int (*start)(struct device *dev);
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int (*stop)(struct device *dev);
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int (*save_state)(struct device *dev);
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int (*restore_state)(struct device *dev);
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bool (*active_wakeup)(struct device *dev);
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};
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struct gpd_cpuidle_data {
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unsigned int saved_exit_latency;
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struct cpuidle_state *idle_state;
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};
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struct generic_pm_domain {
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struct dev_pm_domain domain; /* PM domain operations */
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struct list_head gpd_list_node; /* Node in the global PM domains list */
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struct list_head master_links; /* Links with PM domain as a master */
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struct list_head slave_links; /* Links with PM domain as a slave */
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struct list_head dev_list; /* List of devices */
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struct mutex lock;
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struct dev_power_governor *gov;
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struct work_struct power_off_work;
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const char *name;
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unsigned int in_progress; /* Number of devices being suspended now */
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atomic_t sd_count; /* Number of subdomains with power "on" */
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enum gpd_status status; /* Current state of the domain */
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wait_queue_head_t status_wait_queue;
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struct task_struct *poweroff_task; /* Powering off task */
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unsigned int resume_count; /* Number of devices being resumed */
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unsigned int device_count; /* Number of devices */
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unsigned int suspended_count; /* System suspend device counter */
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unsigned int prepared_count; /* Suspend counter of prepared devices */
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bool suspend_power_off; /* Power status before system suspend */
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int (*power_off)(struct generic_pm_domain *domain);
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s64 power_off_latency_ns;
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int (*power_on)(struct generic_pm_domain *domain);
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s64 power_on_latency_ns;
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struct gpd_dev_ops dev_ops;
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s64 max_off_time_ns; /* Maximum allowed "suspended" time. */
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bool max_off_time_changed;
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bool cached_power_down_ok;
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struct gpd_cpuidle_data *cpuidle_data;
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int (*attach_dev)(struct generic_pm_domain *domain,
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struct device *dev);
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void (*detach_dev)(struct generic_pm_domain *domain,
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struct device *dev);
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unsigned int flags; /* Bit field of configs for genpd */
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};
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static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
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{
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return container_of(pd, struct generic_pm_domain, domain);
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}
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struct gpd_link {
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struct generic_pm_domain *master;
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struct list_head master_node;
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struct generic_pm_domain *slave;
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struct list_head slave_node;
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};
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struct gpd_timing_data {
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s64 stop_latency_ns;
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s64 start_latency_ns;
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s64 save_state_latency_ns;
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s64 restore_state_latency_ns;
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s64 effective_constraint_ns;
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bool constraint_changed;
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bool cached_stop_ok;
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};
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struct pm_domain_data {
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struct list_head list_node;
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struct device *dev;
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};
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struct generic_pm_domain_data {
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struct pm_domain_data base;
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struct gpd_timing_data td;
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struct notifier_block nb;
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int need_restore;
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};
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#ifdef CONFIG_PM_GENERIC_DOMAINS
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static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
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{
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return container_of(pdd, struct generic_pm_domain_data, base);
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}
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static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
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{
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return to_gpd_data(dev->power.subsys_data->domain_data);
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}
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extern struct generic_pm_domain *dev_to_genpd(struct device *dev);
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extern int __pm_genpd_add_device(struct generic_pm_domain *genpd,
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struct device *dev,
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struct gpd_timing_data *td);
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extern int __pm_genpd_name_add_device(const char *domain_name,
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struct device *dev,
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struct gpd_timing_data *td);
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extern int pm_genpd_remove_device(struct generic_pm_domain *genpd,
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struct device *dev);
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extern int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
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struct generic_pm_domain *new_subdomain);
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extern int pm_genpd_add_subdomain_names(const char *master_name,
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const char *subdomain_name);
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extern int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
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struct generic_pm_domain *target);
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extern int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state);
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extern int pm_genpd_name_attach_cpuidle(const char *name, int state);
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extern int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd);
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extern int pm_genpd_name_detach_cpuidle(const char *name);
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extern void pm_genpd_init(struct generic_pm_domain *genpd,
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struct dev_power_governor *gov, bool is_off);
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extern int pm_genpd_poweron(struct generic_pm_domain *genpd);
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extern int pm_genpd_name_poweron(const char *domain_name);
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extern void pm_genpd_poweroff_unused(void);
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extern struct dev_power_governor simple_qos_governor;
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extern struct dev_power_governor pm_domain_always_on_gov;
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#else
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static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline struct generic_pm_domain *dev_to_genpd(struct device *dev)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline int __pm_genpd_add_device(struct generic_pm_domain *genpd,
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struct device *dev,
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struct gpd_timing_data *td)
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{
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return -ENOSYS;
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}
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static inline int __pm_genpd_name_add_device(const char *domain_name,
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struct device *dev,
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struct gpd_timing_data *td)
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{
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return -ENOSYS;
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}
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static inline int pm_genpd_remove_device(struct generic_pm_domain *genpd,
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struct device *dev)
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{
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return -ENOSYS;
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}
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static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
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struct generic_pm_domain *new_sd)
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{
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return -ENOSYS;
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}
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static inline int pm_genpd_add_subdomain_names(const char *master_name,
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const char *subdomain_name)
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{
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return -ENOSYS;
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}
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static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
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struct generic_pm_domain *target)
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{
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return -ENOSYS;
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}
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static inline int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int st)
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{
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return -ENOSYS;
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}
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static inline int pm_genpd_name_attach_cpuidle(const char *name, int state)
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{
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return -ENOSYS;
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}
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static inline int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd)
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{
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return -ENOSYS;
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}
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static inline int pm_genpd_name_detach_cpuidle(const char *name)
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{
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return -ENOSYS;
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}
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static inline void pm_genpd_init(struct generic_pm_domain *genpd,
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struct dev_power_governor *gov, bool is_off)
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{
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}
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static inline int pm_genpd_poweron(struct generic_pm_domain *genpd)
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{
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return -ENOSYS;
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}
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static inline int pm_genpd_name_poweron(const char *domain_name)
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{
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return -ENOSYS;
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}
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static inline void pm_genpd_poweroff_unused(void) {}
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#define simple_qos_governor NULL
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#define pm_domain_always_on_gov NULL
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#endif
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static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
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struct device *dev)
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{
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return __pm_genpd_add_device(genpd, dev, NULL);
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}
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static inline int pm_genpd_name_add_device(const char *domain_name,
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struct device *dev)
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{
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return __pm_genpd_name_add_device(domain_name, dev, NULL);
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}
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#ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
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extern void pm_genpd_syscore_poweroff(struct device *dev);
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extern void pm_genpd_syscore_poweron(struct device *dev);
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#else
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static inline void pm_genpd_syscore_poweroff(struct device *dev) {}
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static inline void pm_genpd_syscore_poweron(struct device *dev) {}
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#endif
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/* OF PM domain providers */
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struct of_device_id;
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struct genpd_onecell_data {
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struct generic_pm_domain **domains;
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unsigned int num_domains;
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};
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typedef struct generic_pm_domain *(*genpd_xlate_t)(struct of_phandle_args *args,
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void *data);
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#ifdef CONFIG_PM_GENERIC_DOMAINS_OF
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int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
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void *data);
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void of_genpd_del_provider(struct device_node *np);
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struct generic_pm_domain *of_genpd_get_from_provider(
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struct of_phandle_args *genpdspec);
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struct generic_pm_domain *__of_genpd_xlate_simple(
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struct of_phandle_args *genpdspec,
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void *data);
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struct generic_pm_domain *__of_genpd_xlate_onecell(
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struct of_phandle_args *genpdspec,
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void *data);
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int genpd_dev_pm_attach(struct device *dev);
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#else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
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static inline int __of_genpd_add_provider(struct device_node *np,
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genpd_xlate_t xlate, void *data)
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{
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return 0;
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}
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static inline void of_genpd_del_provider(struct device_node *np) {}
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static inline struct generic_pm_domain *of_genpd_get_from_provider(
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struct of_phandle_args *genpdspec)
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{
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return NULL;
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}
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#define __of_genpd_xlate_simple NULL
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#define __of_genpd_xlate_onecell NULL
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static inline int genpd_dev_pm_attach(struct device *dev)
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{
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return -ENODEV;
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}
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#endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
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static inline int of_genpd_add_provider_simple(struct device_node *np,
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struct generic_pm_domain *genpd)
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{
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return __of_genpd_add_provider(np, __of_genpd_xlate_simple, genpd);
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}
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static inline int of_genpd_add_provider_onecell(struct device_node *np,
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struct genpd_onecell_data *data)
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{
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return __of_genpd_add_provider(np, __of_genpd_xlate_onecell, data);
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}
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#ifdef CONFIG_PM
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extern int dev_pm_domain_attach(struct device *dev, bool power_on);
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extern void dev_pm_domain_detach(struct device *dev, bool power_off);
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#else
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static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
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{
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return -ENODEV;
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}
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static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
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#endif
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#endif /* _LINUX_PM_DOMAIN_H */
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