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fa048c59bf
Introduce (temporary) wrappers around pm_qos_request(), pm_qos_request_active() and pm_qos_add/update/remove_request() to provide replacements for them with function signatures that will be used in the final CPU latency QoS API, so that the users of it can be switched over to the new arrangement one by one before the API is finally set. No intentional functional impact. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org> Tested-by: Amit Kucheria <amit.kucheria@linaro.org>
336 lines
11 KiB
C
336 lines
11 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_PM_QOS_H
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#define _LINUX_PM_QOS_H
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/* interface for the pm_qos_power infrastructure of the linux kernel.
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*
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* Mark Gross <mgross@linux.intel.com>
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*/
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#include <linux/plist.h>
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#include <linux/notifier.h>
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#include <linux/device.h>
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enum {
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PM_QOS_RESERVED = 0,
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PM_QOS_CPU_DMA_LATENCY,
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/* insert new class ID */
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PM_QOS_NUM_CLASSES,
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};
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enum pm_qos_flags_status {
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PM_QOS_FLAGS_UNDEFINED = -1,
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PM_QOS_FLAGS_NONE,
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PM_QOS_FLAGS_SOME,
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PM_QOS_FLAGS_ALL,
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};
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#define PM_QOS_DEFAULT_VALUE (-1)
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#define PM_QOS_LATENCY_ANY S32_MAX
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#define PM_QOS_LATENCY_ANY_NS ((s64)PM_QOS_LATENCY_ANY * NSEC_PER_USEC)
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#define PM_QOS_CPU_LATENCY_DEFAULT_VALUE (2000 * USEC_PER_SEC)
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#define PM_QOS_RESUME_LATENCY_DEFAULT_VALUE PM_QOS_LATENCY_ANY
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#define PM_QOS_RESUME_LATENCY_NO_CONSTRAINT PM_QOS_LATENCY_ANY
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#define PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS PM_QOS_LATENCY_ANY_NS
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#define PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE 0
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#define PM_QOS_MIN_FREQUENCY_DEFAULT_VALUE 0
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#define PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE FREQ_QOS_MAX_DEFAULT_VALUE
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#define PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT (-1)
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#define PM_QOS_FLAG_NO_POWER_OFF (1 << 0)
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enum pm_qos_type {
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PM_QOS_UNITIALIZED,
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PM_QOS_MAX, /* return the largest value */
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PM_QOS_MIN, /* return the smallest value */
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};
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/*
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* Note: The lockless read path depends on the CPU accessing target_value
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* or effective_flags atomically. Atomic access is only guaranteed on all CPU
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* types linux supports for 32 bit quantites
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*/
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struct pm_qos_constraints {
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struct plist_head list;
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s32 target_value; /* Do not change to 64 bit */
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s32 default_value;
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s32 no_constraint_value;
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enum pm_qos_type type;
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struct blocking_notifier_head *notifiers;
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};
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struct pm_qos_request {
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struct plist_node node;
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struct pm_qos_constraints *qos;
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};
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struct pm_qos_flags_request {
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struct list_head node;
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s32 flags; /* Do not change to 64 bit */
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};
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struct pm_qos_flags {
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struct list_head list;
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s32 effective_flags; /* Do not change to 64 bit */
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};
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#define FREQ_QOS_MIN_DEFAULT_VALUE 0
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#define FREQ_QOS_MAX_DEFAULT_VALUE S32_MAX
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enum freq_qos_req_type {
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FREQ_QOS_MIN = 1,
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FREQ_QOS_MAX,
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};
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struct freq_constraints {
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struct pm_qos_constraints min_freq;
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struct blocking_notifier_head min_freq_notifiers;
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struct pm_qos_constraints max_freq;
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struct blocking_notifier_head max_freq_notifiers;
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};
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struct freq_qos_request {
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enum freq_qos_req_type type;
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struct plist_node pnode;
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struct freq_constraints *qos;
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};
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enum dev_pm_qos_req_type {
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DEV_PM_QOS_RESUME_LATENCY = 1,
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DEV_PM_QOS_LATENCY_TOLERANCE,
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DEV_PM_QOS_MIN_FREQUENCY,
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DEV_PM_QOS_MAX_FREQUENCY,
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DEV_PM_QOS_FLAGS,
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};
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struct dev_pm_qos_request {
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enum dev_pm_qos_req_type type;
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union {
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struct plist_node pnode;
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struct pm_qos_flags_request flr;
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struct freq_qos_request freq;
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} data;
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struct device *dev;
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};
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struct dev_pm_qos {
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struct pm_qos_constraints resume_latency;
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struct pm_qos_constraints latency_tolerance;
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struct freq_constraints freq;
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struct pm_qos_flags flags;
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struct dev_pm_qos_request *resume_latency_req;
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struct dev_pm_qos_request *latency_tolerance_req;
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struct dev_pm_qos_request *flags_req;
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};
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/* Action requested to pm_qos_update_target */
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enum pm_qos_req_action {
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PM_QOS_ADD_REQ, /* Add a new request */
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PM_QOS_UPDATE_REQ, /* Update an existing request */
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PM_QOS_REMOVE_REQ /* Remove an existing request */
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};
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static inline int dev_pm_qos_request_active(struct dev_pm_qos_request *req)
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{
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return req->dev != NULL;
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}
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s32 pm_qos_read_value(struct pm_qos_constraints *c);
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int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
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enum pm_qos_req_action action, int value);
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bool pm_qos_update_flags(struct pm_qos_flags *pqf,
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struct pm_qos_flags_request *req,
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enum pm_qos_req_action action, s32 val);
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void pm_qos_add_request(struct pm_qos_request *req, int pm_qos_class,
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s32 value);
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void pm_qos_update_request(struct pm_qos_request *req,
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s32 new_value);
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void pm_qos_remove_request(struct pm_qos_request *req);
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s32 pm_qos_request(int pm_qos_class);
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int pm_qos_request_active(struct pm_qos_request *req);
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static inline void cpu_latency_qos_add_request(struct pm_qos_request *req,
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s32 value)
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{
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pm_qos_add_request(req, PM_QOS_CPU_DMA_LATENCY, value);
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}
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static inline void cpu_latency_qos_update_request(struct pm_qos_request *req,
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s32 new_value)
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{
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pm_qos_update_request(req, new_value);
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}
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static inline void cpu_latency_qos_remove_request(struct pm_qos_request *req)
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{
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pm_qos_remove_request(req);
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}
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static inline bool cpu_latency_qos_request_active(struct pm_qos_request *req)
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{
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return pm_qos_request_active(req);
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}
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static inline s32 cpu_latency_qos_limit(void)
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{
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return pm_qos_request(PM_QOS_CPU_DMA_LATENCY);
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}
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#ifdef CONFIG_PM
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enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev, s32 mask);
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enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev, s32 mask);
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s32 __dev_pm_qos_resume_latency(struct device *dev);
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s32 dev_pm_qos_read_value(struct device *dev, enum dev_pm_qos_req_type type);
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int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req,
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enum dev_pm_qos_req_type type, s32 value);
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int dev_pm_qos_update_request(struct dev_pm_qos_request *req, s32 new_value);
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int dev_pm_qos_remove_request(struct dev_pm_qos_request *req);
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int dev_pm_qos_add_notifier(struct device *dev,
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struct notifier_block *notifier,
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enum dev_pm_qos_req_type type);
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int dev_pm_qos_remove_notifier(struct device *dev,
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struct notifier_block *notifier,
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enum dev_pm_qos_req_type type);
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void dev_pm_qos_constraints_init(struct device *dev);
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void dev_pm_qos_constraints_destroy(struct device *dev);
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int dev_pm_qos_add_ancestor_request(struct device *dev,
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struct dev_pm_qos_request *req,
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enum dev_pm_qos_req_type type, s32 value);
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int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value);
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void dev_pm_qos_hide_latency_limit(struct device *dev);
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int dev_pm_qos_expose_flags(struct device *dev, s32 value);
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void dev_pm_qos_hide_flags(struct device *dev);
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int dev_pm_qos_update_flags(struct device *dev, s32 mask, bool set);
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s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev);
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int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val);
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int dev_pm_qos_expose_latency_tolerance(struct device *dev);
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void dev_pm_qos_hide_latency_tolerance(struct device *dev);
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static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev)
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{
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return dev->power.qos->resume_latency_req->data.pnode.prio;
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}
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static inline s32 dev_pm_qos_requested_flags(struct device *dev)
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{
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return dev->power.qos->flags_req->data.flr.flags;
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}
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static inline s32 dev_pm_qos_raw_resume_latency(struct device *dev)
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{
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return IS_ERR_OR_NULL(dev->power.qos) ?
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PM_QOS_RESUME_LATENCY_NO_CONSTRAINT :
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pm_qos_read_value(&dev->power.qos->resume_latency);
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}
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#else
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static inline enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev,
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s32 mask)
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{ return PM_QOS_FLAGS_UNDEFINED; }
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static inline enum pm_qos_flags_status dev_pm_qos_flags(struct device *dev,
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s32 mask)
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{ return PM_QOS_FLAGS_UNDEFINED; }
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static inline s32 __dev_pm_qos_resume_latency(struct device *dev)
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{ return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT; }
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static inline s32 dev_pm_qos_read_value(struct device *dev,
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enum dev_pm_qos_req_type type)
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{
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switch (type) {
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case DEV_PM_QOS_RESUME_LATENCY:
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return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
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case DEV_PM_QOS_MIN_FREQUENCY:
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return PM_QOS_MIN_FREQUENCY_DEFAULT_VALUE;
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case DEV_PM_QOS_MAX_FREQUENCY:
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return PM_QOS_MAX_FREQUENCY_DEFAULT_VALUE;
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default:
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WARN_ON(1);
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return 0;
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}
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}
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static inline int dev_pm_qos_add_request(struct device *dev,
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struct dev_pm_qos_request *req,
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enum dev_pm_qos_req_type type,
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s32 value)
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{ return 0; }
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static inline int dev_pm_qos_update_request(struct dev_pm_qos_request *req,
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s32 new_value)
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{ return 0; }
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static inline int dev_pm_qos_remove_request(struct dev_pm_qos_request *req)
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{ return 0; }
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static inline int dev_pm_qos_add_notifier(struct device *dev,
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struct notifier_block *notifier,
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enum dev_pm_qos_req_type type)
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{ return 0; }
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static inline int dev_pm_qos_remove_notifier(struct device *dev,
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struct notifier_block *notifier,
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enum dev_pm_qos_req_type type)
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{ return 0; }
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static inline void dev_pm_qos_constraints_init(struct device *dev)
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{
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dev->power.power_state = PMSG_ON;
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}
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static inline void dev_pm_qos_constraints_destroy(struct device *dev)
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{
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dev->power.power_state = PMSG_INVALID;
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}
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static inline int dev_pm_qos_add_ancestor_request(struct device *dev,
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struct dev_pm_qos_request *req,
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enum dev_pm_qos_req_type type,
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s32 value)
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{ return 0; }
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static inline int dev_pm_qos_expose_latency_limit(struct device *dev, s32 value)
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{ return 0; }
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static inline void dev_pm_qos_hide_latency_limit(struct device *dev) {}
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static inline int dev_pm_qos_expose_flags(struct device *dev, s32 value)
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{ return 0; }
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static inline void dev_pm_qos_hide_flags(struct device *dev) {}
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static inline int dev_pm_qos_update_flags(struct device *dev, s32 m, bool set)
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{ return 0; }
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static inline s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev)
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{ return PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT; }
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static inline int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val)
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{ return 0; }
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static inline int dev_pm_qos_expose_latency_tolerance(struct device *dev)
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{ return 0; }
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static inline void dev_pm_qos_hide_latency_tolerance(struct device *dev) {}
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static inline s32 dev_pm_qos_requested_resume_latency(struct device *dev)
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{
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return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
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}
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static inline s32 dev_pm_qos_requested_flags(struct device *dev) { return 0; }
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static inline s32 dev_pm_qos_raw_resume_latency(struct device *dev)
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{
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return PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
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}
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#endif
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static inline int freq_qos_request_active(struct freq_qos_request *req)
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{
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return !IS_ERR_OR_NULL(req->qos);
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}
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void freq_constraints_init(struct freq_constraints *qos);
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s32 freq_qos_read_value(struct freq_constraints *qos,
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enum freq_qos_req_type type);
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int freq_qos_add_request(struct freq_constraints *qos,
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struct freq_qos_request *req,
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enum freq_qos_req_type type, s32 value);
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int freq_qos_update_request(struct freq_qos_request *req, s32 new_value);
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int freq_qos_remove_request(struct freq_qos_request *req);
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int freq_qos_apply(struct freq_qos_request *req,
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enum pm_qos_req_action action, s32 value);
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int freq_qos_add_notifier(struct freq_constraints *qos,
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enum freq_qos_req_type type,
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struct notifier_block *notifier);
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int freq_qos_remove_notifier(struct freq_constraints *qos,
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enum freq_qos_req_type type,
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struct notifier_block *notifier);
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#endif
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