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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * pm_domain.h - Definitions and headers related to device power domains.
4 *
5 * Copyright (C) 2011 Rafael J. Wysocki <[email protected]>, Renesas Electronics Corp.
6 */
7
8#ifndef _LINUX_PM_DOMAIN_H
9#define _LINUX_PM_DOMAIN_H
10
11#include <linux/device.h>
12#include <linux/ktime.h>
13#include <linux/mutex.h>
14#include <linux/pm.h>
15#include <linux/err.h>
16#include <linux/of.h>
17#include <linux/notifier.h>
18#include <linux/spinlock.h>
19#include <linux/cpumask_types.h>
20#include <linux/time64.h>
21
22/*
23 * Flags to control the behaviour when attaching a device to its PM domains.
24 *
25 * PD_FLAG_NO_DEV_LINK: As the default behaviour creates a device-link
26 * for every PM domain that gets attached, this
27 * flag can be used to skip that.
28 *
29 * PD_FLAG_DEV_LINK_ON: Add the DL_FLAG_RPM_ACTIVE to power-on the
30 * supplier and its PM domain when creating the
31 * device-links.
32 *
33 * PD_FLAG_REQUIRED_OPP: Assign required_devs for the required OPPs. The
34 * index of the required OPP must correspond to the
35 * index in the array of the pd_names. If pd_names
36 * isn't specified, the index just follows the
37 * index for the attached PM domain.
38 *
39 * PD_FLAG_ATTACH_POWER_ON: Power on the domain during attach.
40 *
41 * PD_FLAG_DETACH_POWER_OFF: Power off the domain during detach.
42 *
43 */
44#define PD_FLAG_NO_DEV_LINK BIT(0)
45#define PD_FLAG_DEV_LINK_ON BIT(1)
46#define PD_FLAG_REQUIRED_OPP BIT(2)
47#define PD_FLAG_ATTACH_POWER_ON BIT(3)
48#define PD_FLAG_DETACH_POWER_OFF BIT(4)
49
50struct dev_pm_domain_attach_data {
51 const char * const *pd_names;
52 u32 num_pd_names;
53 u32 pd_flags;
54};
55
56struct dev_pm_domain_list {
57 struct device **pd_devs;
58 struct device_link **pd_links;
59 u32 *opp_tokens;
60 u32 num_pds;
61};
62
63/*
64 * Flags to control the behaviour of a genpd.
65 *
66 * These flags may be set in the struct generic_pm_domain's flags field by a
67 * genpd backend driver. The flags must be set before it calls pm_genpd_init(),
68 * which initializes a genpd.
69 *
70 * GENPD_FLAG_PM_CLK: Instructs genpd to use the PM clk framework,
71 * while powering on/off attached devices.
72 *
73 * GENPD_FLAG_IRQ_SAFE: This informs genpd that its backend callbacks,
74 * ->power_on|off(), doesn't sleep. Hence, these
75 * can be invoked from within atomic context, which
76 * enables genpd to power on/off the PM domain,
77 * even when pm_runtime_is_irq_safe() returns true,
78 * for any of its attached devices. Note that, a
79 * genpd having this flag set, requires its
80 * masterdomains to also have it set.
81 *
82 * GENPD_FLAG_ALWAYS_ON: Instructs genpd to always keep the PM domain
83 * powered on.
84 *
85 * GENPD_FLAG_ACTIVE_WAKEUP: Instructs genpd to keep the PM domain powered
86 * on, in case any of its attached devices is used
87 * in the wakeup path to serve system wakeups.
88 *
89 * GENPD_FLAG_CPU_DOMAIN: Instructs genpd that it should expect to get
90 * devices attached, which may belong to CPUs or
91 * possibly have subdomains with CPUs attached.
92 * This flag enables the genpd backend driver to
93 * deploy idle power management support for CPUs
94 * and groups of CPUs. Note that, the backend
95 * driver must then comply with the so called,
96 * last-man-standing algorithm, for the CPUs in the
97 * PM domain.
98 *
99 * GENPD_FLAG_RPM_ALWAYS_ON: Instructs genpd to always keep the PM domain
100 * powered on except for system suspend.
101 *
102 * GENPD_FLAG_MIN_RESIDENCY: Enable the genpd governor to consider its
103 * components' next wakeup when determining the
104 * optimal idle state.
105 *
106 * GENPD_FLAG_OPP_TABLE_FW: The genpd provider supports performance states,
107 * but its corresponding OPP tables are not
108 * described in DT, but are given directly by FW.
109 *
110 * GENPD_FLAG_DEV_NAME_FW: Instructs genpd to generate an unique device name
111 * using ida. It is used by genpd providers which
112 * get their genpd-names directly from FW.
113 *
114 * GENPD_FLAG_NO_SYNC_STATE: The ->sync_state() support is implemented in a
115 * genpd provider specific way, likely through a
116 * parent device node. This flag makes genpd to
117 * skip its internal support for this.
118 *
119 * GENPD_FLAG_NO_STAY_ON: For genpd OF providers a powered-on PM domain at
120 * initialization is prevented from being
121 * powered-off until the ->sync_state() callback is
122 * invoked. This flag informs genpd to allow a
123 * power-off without waiting for ->sync_state().
124 */
125#define GENPD_FLAG_PM_CLK (1U << 0)
126#define GENPD_FLAG_IRQ_SAFE (1U << 1)
127#define GENPD_FLAG_ALWAYS_ON (1U << 2)
128#define GENPD_FLAG_ACTIVE_WAKEUP (1U << 3)
129#define GENPD_FLAG_CPU_DOMAIN (1U << 4)
130#define GENPD_FLAG_RPM_ALWAYS_ON (1U << 5)
131#define GENPD_FLAG_MIN_RESIDENCY (1U << 6)
132#define GENPD_FLAG_OPP_TABLE_FW (1U << 7)
133#define GENPD_FLAG_DEV_NAME_FW (1U << 8)
134#define GENPD_FLAG_NO_SYNC_STATE (1U << 9)
135#define GENPD_FLAG_NO_STAY_ON (1U << 10)
136
137enum gpd_status {
138 GENPD_STATE_ON = 0, /* PM domain is on */
139 GENPD_STATE_OFF, /* PM domain is off */
140};
141
142enum genpd_notication {
143 GENPD_NOTIFY_PRE_OFF = 0,
144 GENPD_NOTIFY_OFF,
145 GENPD_NOTIFY_PRE_ON,
146 GENPD_NOTIFY_ON,
147};
148
149enum genpd_sync_state {
150 GENPD_SYNC_STATE_OFF = 0,
151 GENPD_SYNC_STATE_SIMPLE,
152 GENPD_SYNC_STATE_ONECELL,
153};
154
155struct dev_power_governor {
156 bool (*system_power_down_ok)(struct dev_pm_domain *domain);
157 bool (*power_down_ok)(struct dev_pm_domain *domain);
158 bool (*suspend_ok)(struct device *dev);
159};
160
161struct gpd_dev_ops {
162 int (*start)(struct device *dev);
163 int (*stop)(struct device *dev);
164};
165
166struct genpd_governor_data {
167 s64 max_off_time_ns;
168 bool max_off_time_changed;
169 ktime_t next_wakeup;
170 ktime_t next_hrtimer;
171 ktime_t last_enter;
172 bool reflect_residency;
173 bool cached_power_down_ok;
174 bool cached_power_down_state_idx;
175};
176
177struct genpd_power_state {
178 const char *name;
179 s64 power_off_latency_ns;
180 s64 power_on_latency_ns;
181 s64 residency_ns;
182 u64 usage;
183 u64 rejected;
184 u64 above;
185 u64 below;
186 u64 usage_s2idle;
187 struct fwnode_handle *fwnode;
188 u64 idle_time;
189 void *data;
190};
191
192struct genpd_lock_ops;
193struct opp_table;
194
195struct generic_pm_domain {
196 struct device dev;
197 struct dev_pm_domain domain; /* PM domain operations */
198 struct list_head gpd_list_node; /* Node in the global PM domains list */
199 struct list_head parent_links; /* Links with PM domain as a parent */
200 struct list_head child_links; /* Links with PM domain as a child */
201 struct list_head dev_list; /* List of devices */
202 struct dev_power_governor *gov;
203 struct genpd_governor_data *gd; /* Data used by a genpd governor. */
204 struct work_struct power_off_work;
205 struct fwnode_handle *provider; /* Identity of the domain provider */
206 bool has_provider;
207 const char *name;
208 atomic_t sd_count; /* Number of subdomains with power "on" */
209 enum gpd_status status; /* Current state of the domain */
210 unsigned int device_count; /* Number of devices */
211 unsigned int device_id; /* unique device id */
212 unsigned int suspended_count; /* System suspend device counter */
213 unsigned int prepared_count; /* Suspend counter of prepared devices */
214 unsigned int performance_state; /* Aggregated max performance state */
215 cpumask_var_t cpus; /* A cpumask of the attached CPUs */
216 bool synced_poweroff; /* A consumer needs a synced poweroff */
217 bool stay_on; /* Stay powered-on during boot. */
218 enum genpd_sync_state sync_state; /* How sync_state is managed. */
219 int (*power_off)(struct generic_pm_domain *domain);
220 int (*power_on)(struct generic_pm_domain *domain);
221 struct raw_notifier_head power_notifiers; /* Power on/off notifiers */
222 struct opp_table *opp_table; /* OPP table of the genpd */
223 int (*set_performance_state)(struct generic_pm_domain *genpd,
224 unsigned int state);
225 struct gpd_dev_ops dev_ops;
226 int (*set_hwmode_dev)(struct generic_pm_domain *domain,
227 struct device *dev, bool enable);
228 bool (*get_hwmode_dev)(struct generic_pm_domain *domain,
229 struct device *dev);
230 int (*attach_dev)(struct generic_pm_domain *domain,
231 struct device *dev);
232 void (*detach_dev)(struct generic_pm_domain *domain,
233 struct device *dev);
234 unsigned int flags; /* Bit field of configs for genpd */
235 struct genpd_power_state *states;
236 void (*free_states)(struct genpd_power_state *states,
237 unsigned int state_count);
238 unsigned int state_count; /* number of states */
239 unsigned int state_idx; /* state that genpd will go to when off */
240 u64 on_time;
241 u64 accounting_time;
242 const struct genpd_lock_ops *lock_ops;
243 union {
244 struct mutex mlock;
245 struct {
246 spinlock_t slock;
247 unsigned long lock_flags;
248 };
249 struct {
250 raw_spinlock_t raw_slock;
251 unsigned long raw_lock_flags;
252 };
253 };
254};
255
256static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
257{
258 return container_of(pd, struct generic_pm_domain, domain);
259}
260
261struct gpd_link {
262 struct generic_pm_domain *parent;
263 struct list_head parent_node;
264 struct generic_pm_domain *child;
265 struct list_head child_node;
266
267 /* Sub-domain's per-master domain performance state */
268 unsigned int performance_state;
269 unsigned int prev_performance_state;
270};
271
272struct gpd_timing_data {
273 s64 suspend_latency_ns;
274 s64 resume_latency_ns;
275 s64 effective_constraint_ns;
276 ktime_t next_wakeup;
277 bool constraint_changed;
278 bool cached_suspend_ok;
279};
280
281struct pm_domain_data {
282 struct list_head list_node;
283 struct device *dev;
284};
285
286struct generic_pm_domain_data {
287 struct pm_domain_data base;
288 struct gpd_timing_data *td;
289 struct notifier_block nb;
290 struct notifier_block *power_nb;
291 int cpu;
292 unsigned int performance_state;
293 unsigned int default_pstate;
294 unsigned int rpm_pstate;
295 unsigned int opp_token;
296 bool hw_mode;
297 bool rpm_always_on;
298 void *data;
299};
300
301#ifdef CONFIG_PM_GENERIC_DOMAINS
302static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
303{
304 return container_of(pdd, struct generic_pm_domain_data, base);
305}
306
307static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
308{
309 return to_gpd_data(dev->power.subsys_data->domain_data);
310}
311
312int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev);
313int pm_genpd_remove_device(struct device *dev);
314int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
315 struct generic_pm_domain *subdomain);
316int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
317 struct generic_pm_domain *subdomain);
318int pm_genpd_init(struct generic_pm_domain *genpd,
319 struct dev_power_governor *gov, bool is_off);
320int pm_genpd_remove(struct generic_pm_domain *genpd);
321void pm_genpd_inc_rejected(struct generic_pm_domain *genpd,
322 unsigned int state_idx);
323struct device *dev_to_genpd_dev(struct device *dev);
324int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state);
325int dev_pm_genpd_add_notifier(struct device *dev, struct notifier_block *nb);
326int dev_pm_genpd_remove_notifier(struct device *dev);
327void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next);
328ktime_t dev_pm_genpd_get_next_hrtimer(struct device *dev);
329void dev_pm_genpd_synced_poweroff(struct device *dev);
330int dev_pm_genpd_set_hwmode(struct device *dev, bool enable);
331bool dev_pm_genpd_get_hwmode(struct device *dev);
332int dev_pm_genpd_rpm_always_on(struct device *dev, bool on);
333bool dev_pm_genpd_is_on(struct device *dev);
334
335extern struct dev_power_governor simple_qos_governor;
336extern struct dev_power_governor pm_domain_always_on_gov;
337#ifdef CONFIG_CPU_IDLE
338extern struct dev_power_governor pm_domain_cpu_gov;
339#endif
340#else
341
342static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
343{
344 return ERR_PTR(-ENOSYS);
345}
346static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
347 struct device *dev)
348{
349 return -ENOSYS;
350}
351static inline int pm_genpd_remove_device(struct device *dev)
352{
353 return -ENOSYS;
354}
355static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
356 struct generic_pm_domain *subdomain)
357{
358 return -ENOSYS;
359}
360static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
361 struct generic_pm_domain *subdomain)
362{
363 return -ENOSYS;
364}
365static inline int pm_genpd_init(struct generic_pm_domain *genpd,
366 struct dev_power_governor *gov, bool is_off)
367{
368 return -ENOSYS;
369}
370static inline int pm_genpd_remove(struct generic_pm_domain *genpd)
371{
372 return -EOPNOTSUPP;
373}
374
375static inline void pm_genpd_inc_rejected(struct generic_pm_domain *genpd,
376 unsigned int state_idx)
377{ }
378
379static inline struct device *dev_to_genpd_dev(struct device *dev)
380{
381 return ERR_PTR(-EOPNOTSUPP);
382}
383
384static inline int dev_pm_genpd_set_performance_state(struct device *dev,
385 unsigned int state)
386{
387 return -EOPNOTSUPP;
388}
389
390static inline int dev_pm_genpd_add_notifier(struct device *dev,
391 struct notifier_block *nb)
392{
393 return -EOPNOTSUPP;
394}
395
396static inline int dev_pm_genpd_remove_notifier(struct device *dev)
397{
398 return -EOPNOTSUPP;
399}
400
401static inline void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next)
402{ }
403
404static inline ktime_t dev_pm_genpd_get_next_hrtimer(struct device *dev)
405{
406 return KTIME_MAX;
407}
408static inline void dev_pm_genpd_synced_poweroff(struct device *dev)
409{ }
410
411static inline int dev_pm_genpd_set_hwmode(struct device *dev, bool enable)
412{
413 return -EOPNOTSUPP;
414}
415
416static inline bool dev_pm_genpd_get_hwmode(struct device *dev)
417{
418 return false;
419}
420
421static inline int dev_pm_genpd_rpm_always_on(struct device *dev, bool on)
422{
423 return -EOPNOTSUPP;
424}
425
426static inline bool dev_pm_genpd_is_on(struct device *dev)
427{
428 return false;
429}
430
431#define simple_qos_governor (*(struct dev_power_governor *)(NULL))
432#define pm_domain_always_on_gov (*(struct dev_power_governor *)(NULL))
433#endif
434
435#ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
436void dev_pm_genpd_suspend(struct device *dev);
437void dev_pm_genpd_resume(struct device *dev);
438#else
439static inline void dev_pm_genpd_suspend(struct device *dev) {}
440static inline void dev_pm_genpd_resume(struct device *dev) {}
441#endif
442
443/* OF PM domain providers */
444struct of_device_id;
445
446typedef struct generic_pm_domain *(*genpd_xlate_t)(const struct of_phandle_args *args,
447 void *data);
448
449struct genpd_onecell_data {
450 struct generic_pm_domain **domains;
451 unsigned int num_domains;
452 genpd_xlate_t xlate;
453};
454
455#ifdef CONFIG_PM_GENERIC_DOMAINS_OF
456int of_genpd_add_provider_simple(struct device_node *np,
457 struct generic_pm_domain *genpd);
458int of_genpd_add_provider_onecell(struct device_node *np,
459 struct genpd_onecell_data *data);
460void of_genpd_del_provider(struct device_node *np);
461int of_genpd_add_device(const struct of_phandle_args *args, struct device *dev);
462int of_genpd_add_subdomain(const struct of_phandle_args *parent_spec,
463 const struct of_phandle_args *subdomain_spec);
464int of_genpd_remove_subdomain(const struct of_phandle_args *parent_spec,
465 const struct of_phandle_args *subdomain_spec);
466struct generic_pm_domain *of_genpd_remove_last(struct device_node *np);
467int of_genpd_parse_idle_states(struct device_node *dn,
468 struct genpd_power_state **states, int *n);
469void of_genpd_sync_state(struct device_node *np);
470int of_genpd_add_child_ids(struct device_node *np,
471 struct genpd_onecell_data *data);
472int of_genpd_remove_child_ids(struct device_node *np,
473 struct genpd_onecell_data *data);
474
475int genpd_dev_pm_attach(struct device *dev);
476struct device *genpd_dev_pm_attach_by_id(struct device *dev,
477 unsigned int index);
478struct device *genpd_dev_pm_attach_by_name(struct device *dev,
479 const char *name);
480#else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
481static inline int of_genpd_add_provider_simple(struct device_node *np,
482 struct generic_pm_domain *genpd)
483{
484 return -EOPNOTSUPP;
485}
486
487static inline int of_genpd_add_provider_onecell(struct device_node *np,
488 struct genpd_onecell_data *data)
489{
490 return -EOPNOTSUPP;
491}
492
493static inline void of_genpd_del_provider(struct device_node *np) {}
494
495static inline int of_genpd_add_device(const struct of_phandle_args *args,
496 struct device *dev)
497{
498 return -ENODEV;
499}
500
501static inline int of_genpd_add_subdomain(const struct of_phandle_args *parent_spec,
502 const struct of_phandle_args *subdomain_spec)
503{
504 return -ENODEV;
505}
506
507static inline int of_genpd_remove_subdomain(const struct of_phandle_args *parent_spec,
508 const struct of_phandle_args *subdomain_spec)
509{
510 return -ENODEV;
511}
512
513static inline int of_genpd_parse_idle_states(struct device_node *dn,
514 struct genpd_power_state **states, int *n)
515{
516 return -ENODEV;
517}
518
519static inline void of_genpd_sync_state(struct device_node *np) {}
520
521static inline int genpd_dev_pm_attach(struct device *dev)
522{
523 return 0;
524}
525
526static inline struct device *genpd_dev_pm_attach_by_id(struct device *dev,
527 unsigned int index)
528{
529 return NULL;
530}
531
532static inline struct device *genpd_dev_pm_attach_by_name(struct device *dev,
533 const char *name)
534{
535 return NULL;
536}
537
538static inline
539struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
540{
541 return ERR_PTR(-EOPNOTSUPP);
542}
543
544static inline int of_genpd_add_child_ids(struct device_node *np,
545 struct genpd_onecell_data *data)
546{
547 return -EOPNOTSUPP;
548}
549
550static inline int of_genpd_remove_child_ids(struct device_node *np,
551 struct genpd_onecell_data *data)
552{
553 return -EOPNOTSUPP;
554}
555#endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
556
557#ifdef CONFIG_PM
558int dev_pm_domain_attach(struct device *dev, u32 flags);
559struct device *dev_pm_domain_attach_by_id(struct device *dev,
560 unsigned int index);
561struct device *dev_pm_domain_attach_by_name(struct device *dev,
562 const char *name);
563int dev_pm_domain_attach_list(struct device *dev,
564 const struct dev_pm_domain_attach_data *data,
565 struct dev_pm_domain_list **list);
566int devm_pm_domain_attach_list(struct device *dev,
567 const struct dev_pm_domain_attach_data *data,
568 struct dev_pm_domain_list **list);
569void dev_pm_domain_detach(struct device *dev, bool power_off);
570void dev_pm_domain_detach_list(struct dev_pm_domain_list *list);
571int dev_pm_domain_start(struct device *dev);
572void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd);
573int dev_pm_domain_set_performance_state(struct device *dev, unsigned int state);
574#else
575static inline int dev_pm_domain_attach(struct device *dev, u32 flags)
576{
577 return 0;
578}
579static inline struct device *dev_pm_domain_attach_by_id(struct device *dev,
580 unsigned int index)
581{
582 return NULL;
583}
584static inline struct device *dev_pm_domain_attach_by_name(struct device *dev,
585 const char *name)
586{
587 return NULL;
588}
589static inline int dev_pm_domain_attach_list(struct device *dev,
590 const struct dev_pm_domain_attach_data *data,
591 struct dev_pm_domain_list **list)
592{
593 return 0;
594}
595
596static inline int devm_pm_domain_attach_list(struct device *dev,
597 const struct dev_pm_domain_attach_data *data,
598 struct dev_pm_domain_list **list)
599{
600 return 0;
601}
602
603static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
604static inline void dev_pm_domain_detach_list(struct dev_pm_domain_list *list) {}
605static inline int dev_pm_domain_start(struct device *dev)
606{
607 return 0;
608}
609static inline void dev_pm_domain_set(struct device *dev,
610 struct dev_pm_domain *pd) {}
611static inline int dev_pm_domain_set_performance_state(struct device *dev,
612 unsigned int state)
613{
614 return 0;
615}
616#endif
617
618#endif /* _LINUX_PM_DOMAIN_H */