]> Git Repo - J-linux.git/blob - include/linux/pm_domain.h
Merge tag 'riscv-for-linus-6.13-mw1' of git://git.kernel.org/pub/scm/linux/kernel...
[J-linux.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 <[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  */
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         bool cached_power_down_ok;
146         bool cached_power_down_state_idx;
147 };
148
149 struct genpd_power_state {
150         s64 power_off_latency_ns;
151         s64 power_on_latency_ns;
152         s64 residency_ns;
153         u64 usage;
154         u64 rejected;
155         struct fwnode_handle *fwnode;
156         u64 idle_time;
157         void *data;
158 };
159
160 struct genpd_lock_ops;
161 struct opp_table;
162
163 struct generic_pm_domain {
164         struct device dev;
165         struct dev_pm_domain domain;    /* PM domain operations */
166         struct list_head gpd_list_node; /* Node in the global PM domains list */
167         struct list_head parent_links;  /* Links with PM domain as a parent */
168         struct list_head child_links;   /* Links with PM domain as a child */
169         struct list_head dev_list;      /* List of devices */
170         struct dev_power_governor *gov;
171         struct genpd_governor_data *gd; /* Data used by a genpd governor. */
172         struct work_struct power_off_work;
173         struct fwnode_handle *provider; /* Identity of the domain provider */
174         bool has_provider;
175         const char *name;
176         atomic_t sd_count;      /* Number of subdomains with power "on" */
177         enum gpd_status status; /* Current state of the domain */
178         unsigned int device_count;      /* Number of devices */
179         unsigned int device_id;         /* unique device id */
180         unsigned int suspended_count;   /* System suspend device counter */
181         unsigned int prepared_count;    /* Suspend counter of prepared devices */
182         unsigned int performance_state; /* Aggregated max performance state */
183         cpumask_var_t cpus;             /* A cpumask of the attached CPUs */
184         bool synced_poweroff;           /* A consumer needs a synced poweroff */
185         int (*power_off)(struct generic_pm_domain *domain);
186         int (*power_on)(struct generic_pm_domain *domain);
187         struct raw_notifier_head power_notifiers; /* Power on/off notifiers */
188         struct opp_table *opp_table;    /* OPP table of the genpd */
189         int (*set_performance_state)(struct generic_pm_domain *genpd,
190                                      unsigned int state);
191         struct gpd_dev_ops dev_ops;
192         int (*set_hwmode_dev)(struct generic_pm_domain *domain,
193                               struct device *dev, bool enable);
194         bool (*get_hwmode_dev)(struct generic_pm_domain *domain,
195                               struct device *dev);
196         int (*attach_dev)(struct generic_pm_domain *domain,
197                           struct device *dev);
198         void (*detach_dev)(struct generic_pm_domain *domain,
199                            struct device *dev);
200         unsigned int flags;             /* Bit field of configs for genpd */
201         struct genpd_power_state *states;
202         void (*free_states)(struct genpd_power_state *states,
203                             unsigned int state_count);
204         unsigned int state_count; /* number of states */
205         unsigned int state_idx; /* state that genpd will go to when off */
206         u64 on_time;
207         u64 accounting_time;
208         const struct genpd_lock_ops *lock_ops;
209         union {
210                 struct mutex mlock;
211                 struct {
212                         spinlock_t slock;
213                         unsigned long lock_flags;
214                 };
215                 struct {
216                         raw_spinlock_t raw_slock;
217                         unsigned long raw_lock_flags;
218                 };
219         };
220 };
221
222 static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd)
223 {
224         return container_of(pd, struct generic_pm_domain, domain);
225 }
226
227 struct gpd_link {
228         struct generic_pm_domain *parent;
229         struct list_head parent_node;
230         struct generic_pm_domain *child;
231         struct list_head child_node;
232
233         /* Sub-domain's per-master domain performance state */
234         unsigned int performance_state;
235         unsigned int prev_performance_state;
236 };
237
238 struct gpd_timing_data {
239         s64 suspend_latency_ns;
240         s64 resume_latency_ns;
241         s64 effective_constraint_ns;
242         ktime_t next_wakeup;
243         bool constraint_changed;
244         bool cached_suspend_ok;
245 };
246
247 struct pm_domain_data {
248         struct list_head list_node;
249         struct device *dev;
250 };
251
252 struct generic_pm_domain_data {
253         struct pm_domain_data base;
254         struct gpd_timing_data *td;
255         struct notifier_block nb;
256         struct notifier_block *power_nb;
257         int cpu;
258         unsigned int performance_state;
259         unsigned int default_pstate;
260         unsigned int rpm_pstate;
261         unsigned int opp_token;
262         bool hw_mode;
263         void *data;
264 };
265
266 #ifdef CONFIG_PM_GENERIC_DOMAINS
267 static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd)
268 {
269         return container_of(pdd, struct generic_pm_domain_data, base);
270 }
271
272 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
273 {
274         return to_gpd_data(dev->power.subsys_data->domain_data);
275 }
276
277 int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev);
278 int pm_genpd_remove_device(struct device *dev);
279 int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
280                            struct generic_pm_domain *subdomain);
281 int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
282                               struct generic_pm_domain *subdomain);
283 int pm_genpd_init(struct generic_pm_domain *genpd,
284                   struct dev_power_governor *gov, bool is_off);
285 int pm_genpd_remove(struct generic_pm_domain *genpd);
286 struct device *dev_to_genpd_dev(struct device *dev);
287 int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state);
288 int dev_pm_genpd_add_notifier(struct device *dev, struct notifier_block *nb);
289 int dev_pm_genpd_remove_notifier(struct device *dev);
290 void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next);
291 ktime_t dev_pm_genpd_get_next_hrtimer(struct device *dev);
292 void dev_pm_genpd_synced_poweroff(struct device *dev);
293 int dev_pm_genpd_set_hwmode(struct device *dev, bool enable);
294 bool dev_pm_genpd_get_hwmode(struct device *dev);
295
296 extern struct dev_power_governor simple_qos_governor;
297 extern struct dev_power_governor pm_domain_always_on_gov;
298 #ifdef CONFIG_CPU_IDLE
299 extern struct dev_power_governor pm_domain_cpu_gov;
300 #endif
301 #else
302
303 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev)
304 {
305         return ERR_PTR(-ENOSYS);
306 }
307 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd,
308                                       struct device *dev)
309 {
310         return -ENOSYS;
311 }
312 static inline int pm_genpd_remove_device(struct device *dev)
313 {
314         return -ENOSYS;
315 }
316 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
317                                          struct generic_pm_domain *subdomain)
318 {
319         return -ENOSYS;
320 }
321 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
322                                             struct generic_pm_domain *subdomain)
323 {
324         return -ENOSYS;
325 }
326 static inline int pm_genpd_init(struct generic_pm_domain *genpd,
327                                 struct dev_power_governor *gov, bool is_off)
328 {
329         return -ENOSYS;
330 }
331 static inline int pm_genpd_remove(struct generic_pm_domain *genpd)
332 {
333         return -EOPNOTSUPP;
334 }
335
336 static inline struct device *dev_to_genpd_dev(struct device *dev)
337 {
338         return ERR_PTR(-EOPNOTSUPP);
339 }
340
341 static inline int dev_pm_genpd_set_performance_state(struct device *dev,
342                                                      unsigned int state)
343 {
344         return -EOPNOTSUPP;
345 }
346
347 static inline int dev_pm_genpd_add_notifier(struct device *dev,
348                                             struct notifier_block *nb)
349 {
350         return -EOPNOTSUPP;
351 }
352
353 static inline int dev_pm_genpd_remove_notifier(struct device *dev)
354 {
355         return -EOPNOTSUPP;
356 }
357
358 static inline void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next)
359 { }
360
361 static inline ktime_t dev_pm_genpd_get_next_hrtimer(struct device *dev)
362 {
363         return KTIME_MAX;
364 }
365 static inline void dev_pm_genpd_synced_poweroff(struct device *dev)
366 { }
367
368 static inline int dev_pm_genpd_set_hwmode(struct device *dev, bool enable)
369 {
370         return -EOPNOTSUPP;
371 }
372
373 static inline bool dev_pm_genpd_get_hwmode(struct device *dev)
374 {
375         return false;
376 }
377
378 #define simple_qos_governor             (*(struct dev_power_governor *)(NULL))
379 #define pm_domain_always_on_gov         (*(struct dev_power_governor *)(NULL))
380 #endif
381
382 #ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP
383 void dev_pm_genpd_suspend(struct device *dev);
384 void dev_pm_genpd_resume(struct device *dev);
385 #else
386 static inline void dev_pm_genpd_suspend(struct device *dev) {}
387 static inline void dev_pm_genpd_resume(struct device *dev) {}
388 #endif
389
390 /* OF PM domain providers */
391 struct of_device_id;
392
393 typedef struct generic_pm_domain *(*genpd_xlate_t)(const struct of_phandle_args *args,
394                                                    void *data);
395
396 struct genpd_onecell_data {
397         struct generic_pm_domain **domains;
398         unsigned int num_domains;
399         genpd_xlate_t xlate;
400 };
401
402 #ifdef CONFIG_PM_GENERIC_DOMAINS_OF
403 int of_genpd_add_provider_simple(struct device_node *np,
404                                  struct generic_pm_domain *genpd);
405 int of_genpd_add_provider_onecell(struct device_node *np,
406                                   struct genpd_onecell_data *data);
407 void of_genpd_del_provider(struct device_node *np);
408 int of_genpd_add_device(const struct of_phandle_args *args, struct device *dev);
409 int of_genpd_add_subdomain(const struct of_phandle_args *parent_spec,
410                            const struct of_phandle_args *subdomain_spec);
411 int of_genpd_remove_subdomain(const struct of_phandle_args *parent_spec,
412                               const struct of_phandle_args *subdomain_spec);
413 struct generic_pm_domain *of_genpd_remove_last(struct device_node *np);
414 int of_genpd_parse_idle_states(struct device_node *dn,
415                                struct genpd_power_state **states, int *n);
416
417 int genpd_dev_pm_attach(struct device *dev);
418 struct device *genpd_dev_pm_attach_by_id(struct device *dev,
419                                          unsigned int index);
420 struct device *genpd_dev_pm_attach_by_name(struct device *dev,
421                                            const char *name);
422 #else /* !CONFIG_PM_GENERIC_DOMAINS_OF */
423 static inline int of_genpd_add_provider_simple(struct device_node *np,
424                                         struct generic_pm_domain *genpd)
425 {
426         return -EOPNOTSUPP;
427 }
428
429 static inline int of_genpd_add_provider_onecell(struct device_node *np,
430                                         struct genpd_onecell_data *data)
431 {
432         return -EOPNOTSUPP;
433 }
434
435 static inline void of_genpd_del_provider(struct device_node *np) {}
436
437 static inline int of_genpd_add_device(const struct of_phandle_args *args,
438                                       struct device *dev)
439 {
440         return -ENODEV;
441 }
442
443 static inline int of_genpd_add_subdomain(const struct of_phandle_args *parent_spec,
444                                          const struct of_phandle_args *subdomain_spec)
445 {
446         return -ENODEV;
447 }
448
449 static inline int of_genpd_remove_subdomain(const struct of_phandle_args *parent_spec,
450                                             const struct of_phandle_args *subdomain_spec)
451 {
452         return -ENODEV;
453 }
454
455 static inline int of_genpd_parse_idle_states(struct device_node *dn,
456                         struct genpd_power_state **states, int *n)
457 {
458         return -ENODEV;
459 }
460
461 static inline int genpd_dev_pm_attach(struct device *dev)
462 {
463         return 0;
464 }
465
466 static inline struct device *genpd_dev_pm_attach_by_id(struct device *dev,
467                                                        unsigned int index)
468 {
469         return NULL;
470 }
471
472 static inline struct device *genpd_dev_pm_attach_by_name(struct device *dev,
473                                                          const char *name)
474 {
475         return NULL;
476 }
477
478 static inline
479 struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
480 {
481         return ERR_PTR(-EOPNOTSUPP);
482 }
483 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
484
485 #ifdef CONFIG_PM
486 int dev_pm_domain_attach(struct device *dev, bool power_on);
487 struct device *dev_pm_domain_attach_by_id(struct device *dev,
488                                           unsigned int index);
489 struct device *dev_pm_domain_attach_by_name(struct device *dev,
490                                             const char *name);
491 int dev_pm_domain_attach_list(struct device *dev,
492                               const struct dev_pm_domain_attach_data *data,
493                               struct dev_pm_domain_list **list);
494 int devm_pm_domain_attach_list(struct device *dev,
495                                const struct dev_pm_domain_attach_data *data,
496                                struct dev_pm_domain_list **list);
497 void dev_pm_domain_detach(struct device *dev, bool power_off);
498 void dev_pm_domain_detach_list(struct dev_pm_domain_list *list);
499 int dev_pm_domain_start(struct device *dev);
500 void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd);
501 int dev_pm_domain_set_performance_state(struct device *dev, unsigned int state);
502 #else
503 static inline int dev_pm_domain_attach(struct device *dev, bool power_on)
504 {
505         return 0;
506 }
507 static inline struct device *dev_pm_domain_attach_by_id(struct device *dev,
508                                                         unsigned int index)
509 {
510         return NULL;
511 }
512 static inline struct device *dev_pm_domain_attach_by_name(struct device *dev,
513                                                           const char *name)
514 {
515         return NULL;
516 }
517 static inline int dev_pm_domain_attach_list(struct device *dev,
518                                 const struct dev_pm_domain_attach_data *data,
519                                 struct dev_pm_domain_list **list)
520 {
521         return 0;
522 }
523
524 static inline int devm_pm_domain_attach_list(struct device *dev,
525                                              const struct dev_pm_domain_attach_data *data,
526                                              struct dev_pm_domain_list **list)
527 {
528         return 0;
529 }
530
531 static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {}
532 static inline void dev_pm_domain_detach_list(struct dev_pm_domain_list *list) {}
533 static inline int dev_pm_domain_start(struct device *dev)
534 {
535         return 0;
536 }
537 static inline void dev_pm_domain_set(struct device *dev,
538                                      struct dev_pm_domain *pd) {}
539 static inline int dev_pm_domain_set_performance_state(struct device *dev,
540                                                       unsigned int state)
541 {
542         return 0;
543 }
544 #endif
545
546 #endif /* _LINUX_PM_DOMAIN_H */
This page took 0.057921 seconds and 4 git commands to generate.