Linux 6.9-rc1
[linux-2.6-microblaze.git] / include / linux / pm_domain.h
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 <rjw@sisk.pl>, 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.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  */
34 #define PD_FLAG_NO_DEV_LINK             BIT(0)
35 #define PD_FLAG_DEV_LINK_ON             BIT(1)
36
37 struct dev_pm_domain_attach_data {
38         const char * const *pd_names;
39         const u32 num_pd_names;
40         const u32 pd_flags;
41 };
42
43 struct dev_pm_domain_list {
44         struct device **pd_devs;
45         struct device_link **pd_links;
46         u32 num_pds;
47 };
48
49 /*
50  * Flags to control the behaviour of a genpd.
51  *
52  * These flags may be set in the struct generic_pm_domain's flags field by a
53  * genpd backend driver. The flags must be set before it calls pm_genpd_init(),
54  * which initializes a genpd.
55  *
56  * GENPD_FLAG_PM_CLK:           Instructs genpd to use the PM clk framework,
57  *                              while powering on/off attached devices.
58  *
59  * GENPD_FLAG_IRQ_SAFE:         This informs genpd that its backend callbacks,
60  *                              ->power_on|off(), doesn't sleep. Hence, these
61  *                              can be invoked from within atomic context, which
62  *                              enables genpd to power on/off the PM domain,
63  *                              even when pm_runtime_is_irq_safe() returns true,
64  *                              for any of its attached devices. Note that, a
65  *                              genpd having this flag set, requires its
66  *                              masterdomains to also have it set.
67  *
68  * GENPD_FLAG_ALWAYS_ON:        Instructs genpd to always keep the PM domain
69  *                              powered on.
70  *
71  * GENPD_FLAG_ACTIVE_WAKEUP:    Instructs genpd to keep the PM domain powered
72  *                              on, in case any of its attached devices is used
73  *                              in the wakeup path to serve system wakeups.
74  *
75  * GENPD_FLAG_CPU_DOMAIN:       Instructs genpd that it should expect to get
76  *                              devices attached, which may belong to CPUs or
77  *                              possibly have subdomains with CPUs attached.
78  *                              This flag enables the genpd backend driver to
79  *                              deploy idle power management support for CPUs
80  *                              and groups of CPUs. Note that, the backend
81  *                              driver must then comply with the so called,
82  *                              last-man-standing algorithm, for the CPUs in the
83  *                              PM domain.
84  *
85  * GENPD_FLAG_RPM_ALWAYS_ON:    Instructs genpd to always keep the PM domain
86  *                              powered on except for system suspend.
87  *
88  * GENPD_FLAG_MIN_RESIDENCY:    Enable the genpd governor to consider its
89  *                              components' next wakeup when determining the
90  *                              optimal idle state.
91  *
92  * GENPD_FLAG_OPP_TABLE_FW:     The genpd provider supports performance states,
93  *                              but its corresponding OPP tables are not
94  *                              described in DT, but are given directly by FW.
95  */
96 #define GENPD_FLAG_PM_CLK        (1U << 0)
97 #define GENPD_FLAG_IRQ_SAFE      (1U << 1)
98 #define GENPD_FLAG_ALWAYS_ON     (1U << 2)
99 #define GENPD_FLAG_ACTIVE_WAKEUP (1U << 3)
100 #define GENPD_FLAG_CPU_DOMAIN    (1U << 4)
101 #define GENPD_FLAG_RPM_ALWAYS_ON (1U << 5)
102 #define GENPD_FLAG_MIN_RESIDENCY (1U << 6)
103 #define GENPD_FLAG_OPP_TABLE_FW  (1U << 7)
104
105 enum gpd_status {
106         GENPD_STATE_ON = 0,     /* PM domain is on */
107         GENPD_STATE_OFF,        /* PM domain is off */
108 };
109
110 enum genpd_notication {
111         GENPD_NOTIFY_PRE_OFF = 0,
112         GENPD_NOTIFY_OFF,
113         GENPD_NOTIFY_PRE_ON,
114         GENPD_NOTIFY_ON,
115 };
116
117 struct dev_power_governor {
118         bool (*power_down_ok)(struct dev_pm_domain *domain);
119         bool (*suspend_ok)(struct device *dev);
120 };
121
122 struct gpd_dev_ops {
123         int (*start)(struct device *dev);
124         int (*stop)(struct device *dev);
125 };
126
127 struct genpd_governor_data {
128         s64 max_off_time_ns;
129         bool max_off_time_changed;
130         ktime_t next_wakeup;
131         ktime_t next_hrtimer;
132         bool cached_power_down_ok;
133         bool cached_power_down_state_idx;
134 };
135
136 struct genpd_power_state {
137         s64 power_off_latency_ns;
138         s64 power_on_latency_ns;
139         s64 residency_ns;
140         u64 usage;
141         u64 rejected;
142         struct fwnode_handle *fwnode;
143         u64 idle_time;
144         void *data;
145 };
146
147 struct genpd_lock_ops;
148 struct opp_table;
149
150 struct generic_pm_domain {
151         struct device dev;
152         struct dev_pm_domain domain;    /* PM domain operations */
153         struct list_head gpd_list_node; /* Node in the global PM domains list */
154         struct list_head parent_links;  /* Links with PM domain as a parent */
155         struct list_head child_links;   /* Links with PM domain as a child */
156         struct list_head dev_list;      /* List of devices */
157         struct dev_power_governor *gov;
158         struct genpd_governor_data *gd; /* Data used by a genpd governor. */
159         struct work_struct power_off_work;
160         struct fwnode_handle *provider; /* Identity of the domain provider */
161         bool has_provider;
162         const char *name;
163         atomic_t sd_count;      /* Number of subdomains with power "on" */
164         enum gpd_status status; /* Current state of the domain */
165         unsigned int device_count;      /* Number of devices */
166         unsigned int suspended_count;   /* System suspend device counter */
167         unsigned int prepared_count;    /* Suspend counter of prepared devices */
168         unsigned int performance_state; /* Aggregated max performance state */
169         cpumask_var_t cpus;             /* A cpumask of the attached CPUs */
170         bool synced_poweroff;           /* A consumer needs a synced poweroff */
171         int (*power_off)(struct generic_pm_domain *domain);
172         int (*power_on)(struct generic_pm_domain *domain);
173         struct raw_notifier_head power_notifiers; /* Power on/off notifiers */
174         struct opp_table *opp_table;    /* OPP table of the genpd */
175         int (*set_performance_state)(struct generic_pm_domain *genpd,
176                                      unsigned int state);
177         struct gpd_dev_ops dev_ops;
178         int (*attach_dev)(struct generic_pm_domain *domain,
179                           struct device *dev);
180         void (*detach_dev)(struct generic_pm_domain *domain,
181                            struct device *dev);
182         unsigned int flags;             /* Bit field of configs for genpd */
183         struct genpd_power_state *states;
184         void (*free_states)(struct genpd_power_state *states,
185                             unsigned int state_count);
186         unsigned int state_count; /* number of states */
187         unsigned int state_idx; /* state that genpd will go to when off */
188         u64 on_time;
189         u64 accounting_time;
190         const struct genpd_lock_ops *lock_ops;
191         union {
192                 struct mutex mlock;
193                 struct {
194                         spinlock_t slock;
195                         unsigned long lock_flags;
196                 };
197         };
198
199 };
200
201 static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
202 {
203         return container_of(pd, struct generic_pm_domain, domain);
204 }
205
206 struct gpd_link {
207         struct generic_pm_domain *parent;
208         struct list_head parent_node;
209         struct generic_pm_domain *child;
210         struct list_head child_node;
211
212         /* Sub-domain's per-master domain performance state */
213         unsigned int performance_state;
214         unsigned int prev_performance_state;
215 };
216
217 struct gpd_timing_data {
218         s64 suspend_latency_ns;
219         s64 resume_latency_ns;
220         s64 effective_constraint_ns;
221         ktime_t next_wakeup;
222         bool constraint_changed;
223         bool cached_suspend_ok;
224 };
225
226 struct pm_domain_data {
227         struct list_head list_node;
228         struct device *dev;
229 };
230
231 struct generic_pm_domain_data {
232         struct pm_domain_data base;
233         struct gpd_timing_data *td;
234         struct notifier_block nb;
235         struct notifier_block *power_nb;
236         int cpu;
237         unsigned int performance_state;
238         unsigned int default_pstate;
239         unsigned int rpm_pstate;
240         void *data;
241 };
242
243 #ifdef CONFIG_PM_GENERIC_DOMAINS
244 static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
245 {
246         return container_of(pdd, struct generic_pm_domain_data, base);
247 }
248
249 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
250 {
251         return to_gpd_data(dev->power.subsys_data->domain_data);
252 }
253
254 int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev);
255 int pm_genpd_remove_device(struct device *dev);
256 int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
257                            struct generic_pm_domain *subdomain);
258 int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
259                               struct generic_pm_domain *subdomain);
260 int pm_genpd_init(struct generic_pm_domain *genpd,
261                   struct dev_power_governor *gov, bool is_off);
262 int pm_genpd_remove(struct generic_pm_domain *genpd);
263 int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state);
264 int dev_pm_genpd_add_notifier(struct device *dev, struct notifier_block *nb);
265 int dev_pm_genpd_remove_notifier(struct device *dev);
266 void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next);
267 ktime_t dev_pm_genpd_get_next_hrtimer(struct device *dev);
268 void dev_pm_genpd_synced_poweroff(struct device *dev);
269
270 extern struct dev_power_governor simple_qos_governor;
271 extern struct dev_power_governor pm_domain_always_on_gov;
272 #ifdef CONFIG_CPU_IDLE
273 extern struct dev_power_governor pm_domain_cpu_gov;
274 #endif
275 #else
276
277 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
278 {
279         return ERR_PTR(-ENOSYS);
280 }
281 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
282                                       struct device *dev)
283 {
284         return -ENOSYS;
285 }
286 static inline int pm_genpd_remove_device(struct device *dev)
287 {
288         return -ENOSYS;
289 }
290 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
291                                          struct generic_pm_domain *subdomain)
292 {
293         return -ENOSYS;
294 }
295 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
296                                             struct generic_pm_domain *subdomain)
297 {
298         return -ENOSYS;
299 }
300 static inline int pm_genpd_init(struct generic_pm_domain *genpd,
301                                 struct dev_power_governor *gov, bool is_off)
302 {
303         return -ENOSYS;
304 }
305 static inline int pm_genpd_remove(struct generic_pm_domain *genpd)
306 {
307         return -EOPNOTSUPP;
308 }
309
310 static inline int dev_pm_genpd_set_performance_state(struct device *dev,
311                                                      unsigned int state)
312 {
313         return -EOPNOTSUPP;
314 }
315
316 static inline int dev_pm_genpd_add_notifier(struct device *dev,
317                                             struct notifier_block *nb)
318 {
319         return -EOPNOTSUPP;
320 }
321
322 static inline int dev_pm_genpd_remove_notifier(struct device *dev)
323 {
324         return -EOPNOTSUPP;
325 }
326
327 static inline void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next)
328 { }
329
330 static inline ktime_t dev_pm_genpd_get_next_hrtimer(struct device *dev)
331 {
332         return KTIME_MAX;
333 }
334 static inline void dev_pm_genpd_synced_poweroff(struct device *dev)
335 { }
336
337 #define simple_qos_governor             (*(struct dev_power_governor *)(NULL))
338 #define pm_domain_always_on_gov         (*(struct dev_power_governor *)(NULL))
339 #endif
340
341 #ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
342 void dev_pm_genpd_suspend(struct device *dev);
343 void dev_pm_genpd_resume(struct device *dev);
344 #else
345 static inline void dev_pm_genpd_suspend(struct device *dev) {}
346 static inline void dev_pm_genpd_resume(struct device *dev) {}
347 #endif
348
349 /* OF PM domain providers */
350 struct of_device_id;
351
352 typedef struct generic_pm_domain *(*genpd_xlate_t)(const struct of_phandle_args *args,
353                                                    void *data);
354
355 struct genpd_onecell_data {
356         struct generic_pm_domain **domains;
357         unsigned int num_domains;
358         genpd_xlate_t xlate;
359 };
360
361 #ifdef CONFIG_PM_GENERIC_DOMAINS_OF
362 int of_genpd_add_provider_simple(struct device_node *np,
363                                  struct generic_pm_domain *genpd);
364 int of_genpd_add_provider_onecell(struct device_node *np,
365                                   struct genpd_onecell_data *data);
366 void of_genpd_del_provider(struct device_node *np);
367 int of_genpd_add_device(const struct of_phandle_args *args, struct device *dev);
368 int of_genpd_add_subdomain(const struct of_phandle_args *parent_spec,
369                            const struct of_phandle_args *subdomain_spec);
370 int of_genpd_remove_subdomain(const struct of_phandle_args *parent_spec,
371                               const struct of_phandle_args *subdomain_spec);
372 struct generic_pm_domain *of_genpd_remove_last(struct device_node *np);
373 int of_genpd_parse_idle_states(struct device_node *dn,
374                                struct genpd_power_state **states, int *n);
375
376 int genpd_dev_pm_attach(struct device *dev);
377 struct device *genpd_dev_pm_attach_by_id(struct device *dev,
378                                          unsigned int index);
379 struct device *genpd_dev_pm_attach_by_name(struct device *dev,
380                                            const char *name);
381 #else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
382 static inline int of_genpd_add_provider_simple(struct device_node *np,
383                                         struct generic_pm_domain *genpd)
384 {
385         return -EOPNOTSUPP;
386 }
387
388 static inline int of_genpd_add_provider_onecell(struct device_node *np,
389                                         struct genpd_onecell_data *data)
390 {
391         return -EOPNOTSUPP;
392 }
393
394 static inline void of_genpd_del_provider(struct device_node *np) {}
395
396 static inline int of_genpd_add_device(const struct of_phandle_args *args,
397                                       struct device *dev)
398 {
399         return -ENODEV;
400 }
401
402 static inline int of_genpd_add_subdomain(const struct of_phandle_args *parent_spec,
403                                          const struct of_phandle_args *subdomain_spec)
404 {
405         return -ENODEV;
406 }
407
408 static inline int of_genpd_remove_subdomain(const struct of_phandle_args *parent_spec,
409                                             const struct of_phandle_args *subdomain_spec)
410 {
411         return -ENODEV;
412 }
413
414 static inline int of_genpd_parse_idle_states(struct device_node *dn,
415                         struct genpd_power_state **states, int *n)
416 {
417         return -ENODEV;
418 }
419
420 static inline int genpd_dev_pm_attach(struct device *dev)
421 {
422         return 0;
423 }
424
425 static inline struct device *genpd_dev_pm_attach_by_id(struct device *dev,
426                                                        unsigned int index)
427 {
428         return NULL;
429 }
430
431 static inline struct device *genpd_dev_pm_attach_by_name(struct device *dev,
432                                                          const char *name)
433 {
434         return NULL;
435 }
436
437 static inline
438 struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
439 {
440         return ERR_PTR(-EOPNOTSUPP);
441 }
442 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
443
444 #ifdef CONFIG_PM
445 int dev_pm_domain_attach(struct device *dev, bool power_on);
446 struct device *dev_pm_domain_attach_by_id(struct device *dev,
447                                           unsigned int index);
448 struct device *dev_pm_domain_attach_by_name(struct device *dev,
449                                             const char *name);
450 int dev_pm_domain_attach_list(struct device *dev,
451                               const struct dev_pm_domain_attach_data *data,
452                               struct dev_pm_domain_list **list);
453 void dev_pm_domain_detach(struct device *dev, bool power_off);
454 void dev_pm_domain_detach_list(struct dev_pm_domain_list *list);
455 int dev_pm_domain_start(struct device *dev);
456 void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd);
457 int dev_pm_domain_set_performance_state(struct device *dev, unsigned int state);
458 #else
459 static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
460 {
461         return 0;
462 }
463 static inline struct device *dev_pm_domain_attach_by_id(struct device *dev,
464                                                         unsigned int index)
465 {
466         return NULL;
467 }
468 static inline struct device *dev_pm_domain_attach_by_name(struct device *dev,
469                                                           const char *name)
470 {
471         return NULL;
472 }
473 static inline int dev_pm_domain_attach_list(struct device *dev,
474                                 const struct dev_pm_domain_attach_data *data,
475                                 struct dev_pm_domain_list **list)
476 {
477         return 0;
478 }
479 static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
480 static inline void dev_pm_domain_detach_list(struct dev_pm_domain_list *list) {}
481 static inline int dev_pm_domain_start(struct device *dev)
482 {
483         return 0;
484 }
485 static inline void dev_pm_domain_set(struct device *dev,
486                                      struct dev_pm_domain *pd) {}
487 static inline int dev_pm_domain_set_performance_state(struct device *dev,
488                                                       unsigned int state)
489 {
490         return 0;
491 }
492 #endif
493
494 #endif /* _LINUX_PM_DOMAIN_H */