0b18160901a2c9ea4281118f00d17ae803327316
[linux-block.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_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  */
40 #define PD_FLAG_NO_DEV_LINK             BIT(0)
41 #define PD_FLAG_DEV_LINK_ON             BIT(1)
42 #define PD_FLAG_REQUIRED_OPP            BIT(2)
43
44 struct dev_pm_domain_attach_data {
45         const char * const *pd_names;
46         const u32 num_pd_names;
47         const u32 pd_flags;
48 };
49
50 struct dev_pm_domain_list {
51         struct device **pd_devs;
52         struct device_link **pd_links;
53         u32 *opp_tokens;
54         u32 num_pds;
55 };
56
57 /*
58  * Flags to control the behaviour of a genpd.
59  *
60  * These flags may be set in the struct generic_pm_domain's flags field by a
61  * genpd backend driver. The flags must be set before it calls pm_genpd_init(),
62  * which initializes a genpd.
63  *
64  * GENPD_FLAG_PM_CLK:           Instructs genpd to use the PM clk framework,
65  *                              while powering on/off attached devices.
66  *
67  * GENPD_FLAG_IRQ_SAFE:         This informs genpd that its backend callbacks,
68  *                              ->power_on|off(), doesn't sleep. Hence, these
69  *                              can be invoked from within atomic context, which
70  *                              enables genpd to power on/off the PM domain,
71  *                              even when pm_runtime_is_irq_safe() returns true,
72  *                              for any of its attached devices. Note that, a
73  *                              genpd having this flag set, requires its
74  *                              masterdomains to also have it set.
75  *
76  * GENPD_FLAG_ALWAYS_ON:        Instructs genpd to always keep the PM domain
77  *                              powered on.
78  *
79  * GENPD_FLAG_ACTIVE_WAKEUP:    Instructs genpd to keep the PM domain powered
80  *                              on, in case any of its attached devices is used
81  *                              in the wakeup path to serve system wakeups.
82  *
83  * GENPD_FLAG_CPU_DOMAIN:       Instructs genpd that it should expect to get
84  *                              devices attached, which may belong to CPUs or
85  *                              possibly have subdomains with CPUs attached.
86  *                              This flag enables the genpd backend driver to
87  *                              deploy idle power management support for CPUs
88  *                              and groups of CPUs. Note that, the backend
89  *                              driver must then comply with the so called,
90  *                              last-man-standing algorithm, for the CPUs in the
91  *                              PM domain.
92  *
93  * GENPD_FLAG_RPM_ALWAYS_ON:    Instructs genpd to always keep the PM domain
94  *                              powered on except for system suspend.
95  *
96  * GENPD_FLAG_MIN_RESIDENCY:    Enable the genpd governor to consider its
97  *                              components' next wakeup when determining the
98  *                              optimal idle state.
99  *
100  * GENPD_FLAG_OPP_TABLE_FW:     The genpd provider supports performance states,
101  *                              but its corresponding OPP tables are not
102  *                              described in DT, but are given directly by FW.
103  *
104  * GENPD_FLAG_DEV_NAME_FW:      Instructs genpd to generate an unique device name
105  *                              using ida. It is used by genpd providers which
106  *                              get their genpd-names directly from FW.
107  */
108 #define GENPD_FLAG_PM_CLK        (1U << 0)
109 #define GENPD_FLAG_IRQ_SAFE      (1U << 1)
110 #define GENPD_FLAG_ALWAYS_ON     (1U << 2)
111 #define GENPD_FLAG_ACTIVE_WAKEUP (1U << 3)
112 #define GENPD_FLAG_CPU_DOMAIN    (1U << 4)
113 #define GENPD_FLAG_RPM_ALWAYS_ON (1U << 5)
114 #define GENPD_FLAG_MIN_RESIDENCY (1U << 6)
115 #define GENPD_FLAG_OPP_TABLE_FW  (1U << 7)
116 #define GENPD_FLAG_DEV_NAME_FW   (1U << 8)
117
118 enum gpd_status {
119         GENPD_STATE_ON = 0,     /* PM domain is on */
120         GENPD_STATE_OFF,        /* PM domain is off */
121 };
122
123 enum genpd_notication {
124         GENPD_NOTIFY_PRE_OFF = 0,
125         GENPD_NOTIFY_OFF,
126         GENPD_NOTIFY_PRE_ON,
127         GENPD_NOTIFY_ON,
128 };
129
130 struct dev_power_governor {
131         bool (*power_down_ok)(struct dev_pm_domain *domain);
132         bool (*suspend_ok)(struct device *dev);
133 };
134
135 struct gpd_dev_ops {
136         int (*start)(struct device *dev);
137         int (*stop)(struct device *dev);
138 };
139
140 struct genpd_governor_data {
141         s64 max_off_time_ns;
142         bool max_off_time_changed;
143         ktime_t next_wakeup;
144         ktime_t next_hrtimer;
145         ktime_t last_enter;
146         bool reflect_residency;
147         bool cached_power_down_ok;
148         bool cached_power_down_state_idx;
149 };
150
151 struct genpd_power_state {
152         const char *name;
153         s64 power_off_latency_ns;
154         s64 power_on_latency_ns;
155         s64 residency_ns;
156         u64 usage;
157         u64 rejected;
158         u64 above;
159         u64 below;
160         struct fwnode_handle *fwnode;
161         u64 idle_time;
162         void *data;
163 };
164
165 struct genpd_lock_ops;
166 struct opp_table;
167
168 struct generic_pm_domain {
169         struct device dev;
170         struct dev_pm_domain domain;    /* PM domain operations */
171         struct list_head gpd_list_node; /* Node in the global PM domains list */
172         struct list_head parent_links;  /* Links with PM domain as a parent */
173         struct list_head child_links;   /* Links with PM domain as a child */
174         struct list_head dev_list;      /* List of devices */
175         struct dev_power_governor *gov;
176         struct genpd_governor_data *gd; /* Data used by a genpd governor. */
177         struct work_struct power_off_work;
178         struct fwnode_handle *provider; /* Identity of the domain provider */
179         bool has_provider;
180         const char *name;
181         atomic_t sd_count;      /* Number of subdomains with power "on" */
182         enum gpd_status status; /* Current state of the domain */
183         unsigned int device_count;      /* Number of devices */
184         unsigned int device_id;         /* unique device id */
185         unsigned int suspended_count;   /* System suspend device counter */
186         unsigned int prepared_count;    /* Suspend counter of prepared devices */
187         unsigned int performance_state; /* Aggregated max performance state */
188         cpumask_var_t cpus;             /* A cpumask of the attached CPUs */
189         bool synced_poweroff;           /* A consumer needs a synced poweroff */
190         int (*power_off)(struct generic_pm_domain *domain);
191         int (*power_on)(struct generic_pm_domain *domain);
192         struct raw_notifier_head power_notifiers; /* Power on/off notifiers */
193         struct opp_table *opp_table;    /* OPP table of the genpd */
194         int (*set_performance_state)(struct generic_pm_domain *genpd,
195                                      unsigned int state);
196         struct gpd_dev_ops dev_ops;
197         int (*set_hwmode_dev)(struct generic_pm_domain *domain,
198                               struct device *dev, bool enable);
199         bool (*get_hwmode_dev)(struct generic_pm_domain *domain,
200                               struct device *dev);
201         int (*attach_dev)(struct generic_pm_domain *domain,
202                           struct device *dev);
203         void (*detach_dev)(struct generic_pm_domain *domain,
204                            struct device *dev);
205         unsigned int flags;             /* Bit field of configs for genpd */
206         struct genpd_power_state *states;
207         void (*free_states)(struct genpd_power_state *states,
208                             unsigned int state_count);
209         unsigned int state_count; /* number of states */
210         unsigned int state_idx; /* state that genpd will go to when off */
211         u64 on_time;
212         u64 accounting_time;
213         const struct genpd_lock_ops *lock_ops;
214         union {
215                 struct mutex mlock;
216                 struct {
217                         spinlock_t slock;
218                         unsigned long lock_flags;
219                 };
220                 struct {
221                         raw_spinlock_t raw_slock;
222                         unsigned long raw_lock_flags;
223                 };
224         };
225 };
226
227 static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
228 {
229         return container_of(pd, struct generic_pm_domain, domain);
230 }
231
232 struct gpd_link {
233         struct generic_pm_domain *parent;
234         struct list_head parent_node;
235         struct generic_pm_domain *child;
236         struct list_head child_node;
237
238         /* Sub-domain's per-master domain performance state */
239         unsigned int performance_state;
240         unsigned int prev_performance_state;
241 };
242
243 struct gpd_timing_data {
244         s64 suspend_latency_ns;
245         s64 resume_latency_ns;
246         s64 effective_constraint_ns;
247         ktime_t next_wakeup;
248         bool constraint_changed;
249         bool cached_suspend_ok;
250 };
251
252 struct pm_domain_data {
253         struct list_head list_node;
254         struct device *dev;
255 };
256
257 struct generic_pm_domain_data {
258         struct pm_domain_data base;
259         struct gpd_timing_data *td;
260         struct notifier_block nb;
261         struct notifier_block *power_nb;
262         int cpu;
263         unsigned int performance_state;
264         unsigned int default_pstate;
265         unsigned int rpm_pstate;
266         unsigned int opp_token;
267         bool hw_mode;
268         bool rpm_always_on;
269         void *data;
270 };
271
272 #ifdef CONFIG_PM_GENERIC_DOMAINS
273 static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
274 {
275         return container_of(pdd, struct generic_pm_domain_data, base);
276 }
277
278 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
279 {
280         return to_gpd_data(dev->power.subsys_data->domain_data);
281 }
282
283 int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev);
284 int pm_genpd_remove_device(struct device *dev);
285 int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
286                            struct generic_pm_domain *subdomain);
287 int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
288                               struct generic_pm_domain *subdomain);
289 int pm_genpd_init(struct generic_pm_domain *genpd,
290                   struct dev_power_governor *gov, bool is_off);
291 int pm_genpd_remove(struct generic_pm_domain *genpd);
292 void pm_genpd_inc_rejected(struct generic_pm_domain *genpd,
293                            unsigned int state_idx);
294 struct device *dev_to_genpd_dev(struct device *dev);
295 int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state);
296 int dev_pm_genpd_add_notifier(struct device *dev, struct notifier_block *nb);
297 int dev_pm_genpd_remove_notifier(struct device *dev);
298 void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next);
299 ktime_t dev_pm_genpd_get_next_hrtimer(struct device *dev);
300 void dev_pm_genpd_synced_poweroff(struct device *dev);
301 int dev_pm_genpd_set_hwmode(struct device *dev, bool enable);
302 bool dev_pm_genpd_get_hwmode(struct device *dev);
303 int dev_pm_genpd_rpm_always_on(struct device *dev, bool on);
304
305 extern struct dev_power_governor simple_qos_governor;
306 extern struct dev_power_governor pm_domain_always_on_gov;
307 #ifdef CONFIG_CPU_IDLE
308 extern struct dev_power_governor pm_domain_cpu_gov;
309 #endif
310 #else
311
312 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
313 {
314         return ERR_PTR(-ENOSYS);
315 }
316 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
317                                       struct device *dev)
318 {
319         return -ENOSYS;
320 }
321 static inline int pm_genpd_remove_device(struct device *dev)
322 {
323         return -ENOSYS;
324 }
325 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
326                                          struct generic_pm_domain *subdomain)
327 {
328         return -ENOSYS;
329 }
330 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
331                                             struct generic_pm_domain *subdomain)
332 {
333         return -ENOSYS;
334 }
335 static inline int pm_genpd_init(struct generic_pm_domain *genpd,
336                                 struct dev_power_governor *gov, bool is_off)
337 {
338         return -ENOSYS;
339 }
340 static inline int pm_genpd_remove(struct generic_pm_domain *genpd)
341 {
342         return -EOPNOTSUPP;
343 }
344
345 static inline void pm_genpd_inc_rejected(struct generic_pm_domain *genpd,
346                                          unsigned int state_idx)
347 { }
348
349 static inline struct device *dev_to_genpd_dev(struct device *dev)
350 {
351         return ERR_PTR(-EOPNOTSUPP);
352 }
353
354 static inline int dev_pm_genpd_set_performance_state(struct device *dev,
355                                                      unsigned int state)
356 {
357         return -EOPNOTSUPP;
358 }
359
360 static inline int dev_pm_genpd_add_notifier(struct device *dev,
361                                             struct notifier_block *nb)
362 {
363         return -EOPNOTSUPP;
364 }
365
366 static inline int dev_pm_genpd_remove_notifier(struct device *dev)
367 {
368         return -EOPNOTSUPP;
369 }
370
371 static inline void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next)
372 { }
373
374 static inline ktime_t dev_pm_genpd_get_next_hrtimer(struct device *dev)
375 {
376         return KTIME_MAX;
377 }
378 static inline void dev_pm_genpd_synced_poweroff(struct device *dev)
379 { }
380
381 static inline int dev_pm_genpd_set_hwmode(struct device *dev, bool enable)
382 {
383         return -EOPNOTSUPP;
384 }
385
386 static inline bool dev_pm_genpd_get_hwmode(struct device *dev)
387 {
388         return false;
389 }
390
391 static inline int dev_pm_genpd_rpm_always_on(struct device *dev, bool on)
392 {
393         return -EOPNOTSUPP;
394 }
395
396 #define simple_qos_governor             (*(struct dev_power_governor *)(NULL))
397 #define pm_domain_always_on_gov         (*(struct dev_power_governor *)(NULL))
398 #endif
399
400 #ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
401 void dev_pm_genpd_suspend(struct device *dev);
402 void dev_pm_genpd_resume(struct device *dev);
403 #else
404 static inline void dev_pm_genpd_suspend(struct device *dev) {}
405 static inline void dev_pm_genpd_resume(struct device *dev) {}
406 #endif
407
408 /* OF PM domain providers */
409 struct of_device_id;
410
411 typedef struct generic_pm_domain *(*genpd_xlate_t)(const struct of_phandle_args *args,
412                                                    void *data);
413
414 struct genpd_onecell_data {
415         struct generic_pm_domain **domains;
416         unsigned int num_domains;
417         genpd_xlate_t xlate;
418 };
419
420 #ifdef CONFIG_PM_GENERIC_DOMAINS_OF
421 int of_genpd_add_provider_simple(struct device_node *np,
422                                  struct generic_pm_domain *genpd);
423 int of_genpd_add_provider_onecell(struct device_node *np,
424                                   struct genpd_onecell_data *data);
425 void of_genpd_del_provider(struct device_node *np);
426 int of_genpd_add_device(const struct of_phandle_args *args, struct device *dev);
427 int of_genpd_add_subdomain(const struct of_phandle_args *parent_spec,
428                            const struct of_phandle_args *subdomain_spec);
429 int of_genpd_remove_subdomain(const struct of_phandle_args *parent_spec,
430                               const struct of_phandle_args *subdomain_spec);
431 struct generic_pm_domain *of_genpd_remove_last(struct device_node *np);
432 int of_genpd_parse_idle_states(struct device_node *dn,
433                                struct genpd_power_state **states, int *n);
434
435 int genpd_dev_pm_attach(struct device *dev);
436 struct device *genpd_dev_pm_attach_by_id(struct device *dev,
437                                          unsigned int index);
438 struct device *genpd_dev_pm_attach_by_name(struct device *dev,
439                                            const char *name);
440 #else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
441 static inline int of_genpd_add_provider_simple(struct device_node *np,
442                                         struct generic_pm_domain *genpd)
443 {
444         return -EOPNOTSUPP;
445 }
446
447 static inline int of_genpd_add_provider_onecell(struct device_node *np,
448                                         struct genpd_onecell_data *data)
449 {
450         return -EOPNOTSUPP;
451 }
452
453 static inline void of_genpd_del_provider(struct device_node *np) {}
454
455 static inline int of_genpd_add_device(const struct of_phandle_args *args,
456                                       struct device *dev)
457 {
458         return -ENODEV;
459 }
460
461 static inline int of_genpd_add_subdomain(const struct of_phandle_args *parent_spec,
462                                          const struct of_phandle_args *subdomain_spec)
463 {
464         return -ENODEV;
465 }
466
467 static inline int of_genpd_remove_subdomain(const struct of_phandle_args *parent_spec,
468                                             const struct of_phandle_args *subdomain_spec)
469 {
470         return -ENODEV;
471 }
472
473 static inline int of_genpd_parse_idle_states(struct device_node *dn,
474                         struct genpd_power_state **states, int *n)
475 {
476         return -ENODEV;
477 }
478
479 static inline int genpd_dev_pm_attach(struct device *dev)
480 {
481         return 0;
482 }
483
484 static inline struct device *genpd_dev_pm_attach_by_id(struct device *dev,
485                                                        unsigned int index)
486 {
487         return NULL;
488 }
489
490 static inline struct device *genpd_dev_pm_attach_by_name(struct device *dev,
491                                                          const char *name)
492 {
493         return NULL;
494 }
495
496 static inline
497 struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
498 {
499         return ERR_PTR(-EOPNOTSUPP);
500 }
501 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
502
503 #ifdef CONFIG_PM
504 int dev_pm_domain_attach(struct device *dev, bool power_on);
505 struct device *dev_pm_domain_attach_by_id(struct device *dev,
506                                           unsigned int index);
507 struct device *dev_pm_domain_attach_by_name(struct device *dev,
508                                             const char *name);
509 int dev_pm_domain_attach_list(struct device *dev,
510                               const struct dev_pm_domain_attach_data *data,
511                               struct dev_pm_domain_list **list);
512 int devm_pm_domain_attach_list(struct device *dev,
513                                const struct dev_pm_domain_attach_data *data,
514                                struct dev_pm_domain_list **list);
515 void dev_pm_domain_detach(struct device *dev, bool power_off);
516 void dev_pm_domain_detach_list(struct dev_pm_domain_list *list);
517 int dev_pm_domain_start(struct device *dev);
518 void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd);
519 int dev_pm_domain_set_performance_state(struct device *dev, unsigned int state);
520 #else
521 static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
522 {
523         return 0;
524 }
525 static inline struct device *dev_pm_domain_attach_by_id(struct device *dev,
526                                                         unsigned int index)
527 {
528         return NULL;
529 }
530 static inline struct device *dev_pm_domain_attach_by_name(struct device *dev,
531                                                           const char *name)
532 {
533         return NULL;
534 }
535 static inline int dev_pm_domain_attach_list(struct device *dev,
536                                 const struct dev_pm_domain_attach_data *data,
537                                 struct dev_pm_domain_list **list)
538 {
539         return 0;
540 }
541
542 static inline int devm_pm_domain_attach_list(struct device *dev,
543                                              const struct dev_pm_domain_attach_data *data,
544                                              struct dev_pm_domain_list **list)
545 {
546         return 0;
547 }
548
549 static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
550 static inline void dev_pm_domain_detach_list(struct dev_pm_domain_list *list) {}
551 static inline int dev_pm_domain_start(struct device *dev)
552 {
553         return 0;
554 }
555 static inline void dev_pm_domain_set(struct device *dev,
556                                      struct dev_pm_domain *pd) {}
557 static inline int dev_pm_domain_set_performance_state(struct device *dev,
558                                                       unsigned int state)
559 {
560         return 0;
561 }
562 #endif
563
564 #endif /* _LINUX_PM_DOMAIN_H */