Merge branch 'address-masking'
[linux-2.6-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.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 struct device *dev_to_genpd_dev(struct device *dev);
264 int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state);
265 int dev_pm_genpd_add_notifier(struct device *dev, struct notifier_block *nb);
266 int dev_pm_genpd_remove_notifier(struct device *dev);
267 void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next);
268 ktime_t dev_pm_genpd_get_next_hrtimer(struct device *dev);
269 void dev_pm_genpd_synced_poweroff(struct device *dev);
270
271 extern struct dev_power_governor simple_qos_governor;
272 extern struct dev_power_governor pm_domain_always_on_gov;
273 #ifdef CONFIG_CPU_IDLE
274 extern struct dev_power_governor pm_domain_cpu_gov;
275 #endif
276 #else
277
278 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
279 {
280         return ERR_PTR(-ENOSYS);
281 }
282 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
283                                       struct device *dev)
284 {
285         return -ENOSYS;
286 }
287 static inline int pm_genpd_remove_device(struct device *dev)
288 {
289         return -ENOSYS;
290 }
291 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
292                                          struct generic_pm_domain *subdomain)
293 {
294         return -ENOSYS;
295 }
296 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
297                                             struct generic_pm_domain *subdomain)
298 {
299         return -ENOSYS;
300 }
301 static inline int pm_genpd_init(struct generic_pm_domain *genpd,
302                                 struct dev_power_governor *gov, bool is_off)
303 {
304         return -ENOSYS;
305 }
306 static inline int pm_genpd_remove(struct generic_pm_domain *genpd)
307 {
308         return -EOPNOTSUPP;
309 }
310
311 static inline struct device *dev_to_genpd_dev(struct device *dev)
312 {
313         return ERR_PTR(-EOPNOTSUPP);
314 }
315
316 static inline int dev_pm_genpd_set_performance_state(struct device *dev,
317                                                      unsigned int state)
318 {
319         return -EOPNOTSUPP;
320 }
321
322 static inline int dev_pm_genpd_add_notifier(struct device *dev,
323                                             struct notifier_block *nb)
324 {
325         return -EOPNOTSUPP;
326 }
327
328 static inline int dev_pm_genpd_remove_notifier(struct device *dev)
329 {
330         return -EOPNOTSUPP;
331 }
332
333 static inline void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next)
334 { }
335
336 static inline ktime_t dev_pm_genpd_get_next_hrtimer(struct device *dev)
337 {
338         return KTIME_MAX;
339 }
340 static inline void dev_pm_genpd_synced_poweroff(struct device *dev)
341 { }
342
343 #define simple_qos_governor             (*(struct dev_power_governor *)(NULL))
344 #define pm_domain_always_on_gov         (*(struct dev_power_governor *)(NULL))
345 #endif
346
347 #ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
348 void dev_pm_genpd_suspend(struct device *dev);
349 void dev_pm_genpd_resume(struct device *dev);
350 #else
351 static inline void dev_pm_genpd_suspend(struct device *dev) {}
352 static inline void dev_pm_genpd_resume(struct device *dev) {}
353 #endif
354
355 /* OF PM domain providers */
356 struct of_device_id;
357
358 typedef struct generic_pm_domain *(*genpd_xlate_t)(const struct of_phandle_args *args,
359                                                    void *data);
360
361 struct genpd_onecell_data {
362         struct generic_pm_domain **domains;
363         unsigned int num_domains;
364         genpd_xlate_t xlate;
365 };
366
367 #ifdef CONFIG_PM_GENERIC_DOMAINS_OF
368 int of_genpd_add_provider_simple(struct device_node *np,
369                                  struct generic_pm_domain *genpd);
370 int of_genpd_add_provider_onecell(struct device_node *np,
371                                   struct genpd_onecell_data *data);
372 void of_genpd_del_provider(struct device_node *np);
373 int of_genpd_add_device(const struct of_phandle_args *args, struct device *dev);
374 int of_genpd_add_subdomain(const struct of_phandle_args *parent_spec,
375                            const struct of_phandle_args *subdomain_spec);
376 int of_genpd_remove_subdomain(const struct of_phandle_args *parent_spec,
377                               const struct of_phandle_args *subdomain_spec);
378 struct generic_pm_domain *of_genpd_remove_last(struct device_node *np);
379 int of_genpd_parse_idle_states(struct device_node *dn,
380                                struct genpd_power_state **states, int *n);
381
382 int genpd_dev_pm_attach(struct device *dev);
383 struct device *genpd_dev_pm_attach_by_id(struct device *dev,
384                                          unsigned int index);
385 struct device *genpd_dev_pm_attach_by_name(struct device *dev,
386                                            const char *name);
387 #else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
388 static inline int of_genpd_add_provider_simple(struct device_node *np,
389                                         struct generic_pm_domain *genpd)
390 {
391         return -EOPNOTSUPP;
392 }
393
394 static inline int of_genpd_add_provider_onecell(struct device_node *np,
395                                         struct genpd_onecell_data *data)
396 {
397         return -EOPNOTSUPP;
398 }
399
400 static inline void of_genpd_del_provider(struct device_node *np) {}
401
402 static inline int of_genpd_add_device(const struct of_phandle_args *args,
403                                       struct device *dev)
404 {
405         return -ENODEV;
406 }
407
408 static inline int of_genpd_add_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_remove_subdomain(const struct of_phandle_args *parent_spec,
415                                             const struct of_phandle_args *subdomain_spec)
416 {
417         return -ENODEV;
418 }
419
420 static inline int of_genpd_parse_idle_states(struct device_node *dn,
421                         struct genpd_power_state **states, int *n)
422 {
423         return -ENODEV;
424 }
425
426 static inline int genpd_dev_pm_attach(struct device *dev)
427 {
428         return 0;
429 }
430
431 static inline struct device *genpd_dev_pm_attach_by_id(struct device *dev,
432                                                        unsigned int index)
433 {
434         return NULL;
435 }
436
437 static inline struct device *genpd_dev_pm_attach_by_name(struct device *dev,
438                                                          const char *name)
439 {
440         return NULL;
441 }
442
443 static inline
444 struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
445 {
446         return ERR_PTR(-EOPNOTSUPP);
447 }
448 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
449
450 #ifdef CONFIG_PM
451 int dev_pm_domain_attach(struct device *dev, bool power_on);
452 struct device *dev_pm_domain_attach_by_id(struct device *dev,
453                                           unsigned int index);
454 struct device *dev_pm_domain_attach_by_name(struct device *dev,
455                                             const char *name);
456 int dev_pm_domain_attach_list(struct device *dev,
457                               const struct dev_pm_domain_attach_data *data,
458                               struct dev_pm_domain_list **list);
459 void dev_pm_domain_detach(struct device *dev, bool power_off);
460 void dev_pm_domain_detach_list(struct dev_pm_domain_list *list);
461 int dev_pm_domain_start(struct device *dev);
462 void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd);
463 int dev_pm_domain_set_performance_state(struct device *dev, unsigned int state);
464 #else
465 static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
466 {
467         return 0;
468 }
469 static inline struct device *dev_pm_domain_attach_by_id(struct device *dev,
470                                                         unsigned int index)
471 {
472         return NULL;
473 }
474 static inline struct device *dev_pm_domain_attach_by_name(struct device *dev,
475                                                           const char *name)
476 {
477         return NULL;
478 }
479 static inline int dev_pm_domain_attach_list(struct device *dev,
480                                 const struct dev_pm_domain_attach_data *data,
481                                 struct dev_pm_domain_list **list)
482 {
483         return 0;
484 }
485 static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
486 static inline void dev_pm_domain_detach_list(struct dev_pm_domain_list *list) {}
487 static inline int dev_pm_domain_start(struct device *dev)
488 {
489         return 0;
490 }
491 static inline void dev_pm_domain_set(struct device *dev,
492                                      struct dev_pm_domain *pd) {}
493 static inline int dev_pm_domain_set_performance_state(struct device *dev,
494                                                       unsigned int state)
495 {
496         return 0;
497 }
498 #endif
499
500 #endif /* _LINUX_PM_DOMAIN_H */