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.h> 20 21 /* 22 * Flags to control the behaviour of a genpd. 23 * 24 * These flags may be set in the struct generic_pm_domain's flags field by a 25 * genpd backend driver. The flags must be set before it calls pm_genpd_init(), 26 * which initializes a genpd. 27 * 28 * GENPD_FLAG_PM_CLK: Instructs genpd to use the PM clk framework, 29 * while powering on/off attached devices. 30 * 31 * GENPD_FLAG_IRQ_SAFE: This informs genpd that its backend callbacks, 32 * ->power_on|off(), doesn't sleep. Hence, these 33 * can be invoked from within atomic context, which 34 * enables genpd to power on/off the PM domain, 35 * even when pm_runtime_is_irq_safe() returns true, 36 * for any of its attached devices. Note that, a 37 * genpd having this flag set, requires its 38 * masterdomains to also have it set. 39 * 40 * GENPD_FLAG_ALWAYS_ON: Instructs genpd to always keep the PM domain 41 * powered on. 42 * 43 * GENPD_FLAG_ACTIVE_WAKEUP: Instructs genpd to keep the PM domain powered 44 * on, in case any of its attached devices is used 45 * in the wakeup path to serve system wakeups. 46 * 47 * GENPD_FLAG_CPU_DOMAIN: Instructs genpd that it should expect to get 48 * devices attached, which may belong to CPUs or 49 * possibly have subdomains with CPUs attached. 50 * This flag enables the genpd backend driver to 51 * deploy idle power management support for CPUs 52 * and groups of CPUs. Note that, the backend 53 * driver must then comply with the so called, 54 * last-man-standing algorithm, for the CPUs in the 55 * PM domain. 56 * 57 * GENPD_FLAG_RPM_ALWAYS_ON: Instructs genpd to always keep the PM domain 58 * powered on except for system suspend. 59 * 60 * GENPD_FLAG_MIN_RESIDENCY: Enable the genpd governor to consider its 61 * components' next wakeup when determining the 62 * optimal idle state. 63 */ 64 #define GENPD_FLAG_PM_CLK (1U << 0) 65 #define GENPD_FLAG_IRQ_SAFE (1U << 1) 66 #define GENPD_FLAG_ALWAYS_ON (1U << 2) 67 #define GENPD_FLAG_ACTIVE_WAKEUP (1U << 3) 68 #define GENPD_FLAG_CPU_DOMAIN (1U << 4) 69 #define GENPD_FLAG_RPM_ALWAYS_ON (1U << 5) 70 #define GENPD_FLAG_MIN_RESIDENCY (1U << 6) 71 72 enum gpd_status { 73 GENPD_STATE_ON = 0, /* PM domain is on */ 74 GENPD_STATE_OFF, /* PM domain is off */ 75 }; 76 77 enum genpd_notication { 78 GENPD_NOTIFY_PRE_OFF = 0, 79 GENPD_NOTIFY_OFF, 80 GENPD_NOTIFY_PRE_ON, 81 GENPD_NOTIFY_ON, 82 }; 83 84 struct dev_power_governor { 85 bool (*power_down_ok)(struct dev_pm_domain *domain); 86 bool (*suspend_ok)(struct device *dev); 87 }; 88 89 struct gpd_dev_ops { 90 int (*start)(struct device *dev); 91 int (*stop)(struct device *dev); 92 }; 93 94 struct genpd_power_state { 95 s64 power_off_latency_ns; 96 s64 power_on_latency_ns; 97 s64 residency_ns; 98 u64 usage; 99 u64 rejected; 100 struct fwnode_handle *fwnode; 101 ktime_t idle_time; 102 void *data; 103 }; 104 105 struct genpd_lock_ops; 106 struct dev_pm_opp; 107 struct opp_table; 108 109 struct generic_pm_domain { 110 struct device dev; 111 struct dev_pm_domain domain; /* PM domain operations */ 112 struct list_head gpd_list_node; /* Node in the global PM domains list */ 113 struct list_head parent_links; /* Links with PM domain as a parent */ 114 struct list_head child_links; /* Links with PM domain as a child */ 115 struct list_head dev_list; /* List of devices */ 116 struct dev_power_governor *gov; 117 struct work_struct power_off_work; 118 struct fwnode_handle *provider; /* Identity of the domain provider */ 119 bool has_provider; 120 const char *name; 121 atomic_t sd_count; /* Number of subdomains with power "on" */ 122 enum gpd_status status; /* Current state of the domain */ 123 unsigned int device_count; /* Number of devices */ 124 unsigned int suspended_count; /* System suspend device counter */ 125 unsigned int prepared_count; /* Suspend counter of prepared devices */ 126 unsigned int performance_state; /* Aggregated max performance state */ 127 cpumask_var_t cpus; /* A cpumask of the attached CPUs */ 128 int (*power_off)(struct generic_pm_domain *domain); 129 int (*power_on)(struct generic_pm_domain *domain); 130 struct raw_notifier_head power_notifiers; /* Power on/off notifiers */ 131 struct opp_table *opp_table; /* OPP table of the genpd */ 132 unsigned int (*opp_to_performance_state)(struct generic_pm_domain *genpd, 133 struct dev_pm_opp *opp); 134 int (*set_performance_state)(struct generic_pm_domain *genpd, 135 unsigned int state); 136 struct gpd_dev_ops dev_ops; 137 s64 max_off_time_ns; /* Maximum allowed "suspended" time. */ 138 ktime_t next_wakeup; /* Maintained by the domain governor */ 139 bool max_off_time_changed; 140 bool cached_power_down_ok; 141 bool cached_power_down_state_idx; 142 int (*attach_dev)(struct generic_pm_domain *domain, 143 struct device *dev); 144 void (*detach_dev)(struct generic_pm_domain *domain, 145 struct device *dev); 146 unsigned int flags; /* Bit field of configs for genpd */ 147 struct genpd_power_state *states; 148 void (*free_states)(struct genpd_power_state *states, 149 unsigned int state_count); 150 unsigned int state_count; /* number of states */ 151 unsigned int state_idx; /* state that genpd will go to when off */ 152 ktime_t on_time; 153 ktime_t accounting_time; 154 const struct genpd_lock_ops *lock_ops; 155 union { 156 struct mutex mlock; 157 struct { 158 spinlock_t slock; 159 unsigned long lock_flags; 160 }; 161 }; 162 163 }; 164 165 static inline struct generic_pm_domain *pd_to_genpd(struct dev_pm_domain *pd) 166 { 167 return container_of(pd, struct generic_pm_domain, domain); 168 } 169 170 struct gpd_link { 171 struct generic_pm_domain *parent; 172 struct list_head parent_node; 173 struct generic_pm_domain *child; 174 struct list_head child_node; 175 176 /* Sub-domain's per-master domain performance state */ 177 unsigned int performance_state; 178 unsigned int prev_performance_state; 179 }; 180 181 struct gpd_timing_data { 182 s64 suspend_latency_ns; 183 s64 resume_latency_ns; 184 s64 effective_constraint_ns; 185 bool constraint_changed; 186 bool cached_suspend_ok; 187 }; 188 189 struct pm_domain_data { 190 struct list_head list_node; 191 struct device *dev; 192 }; 193 194 struct generic_pm_domain_data { 195 struct pm_domain_data base; 196 struct gpd_timing_data td; 197 struct notifier_block nb; 198 struct notifier_block *power_nb; 199 int cpu; 200 unsigned int performance_state; 201 ktime_t next_wakeup; 202 void *data; 203 }; 204 205 #ifdef CONFIG_PM_GENERIC_DOMAINS 206 static inline struct generic_pm_domain_data *to_gpd_data(struct pm_domain_data *pdd) 207 { 208 return container_of(pdd, struct generic_pm_domain_data, base); 209 } 210 211 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev) 212 { 213 return to_gpd_data(dev->power.subsys_data->domain_data); 214 } 215 216 int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev); 217 int pm_genpd_remove_device(struct device *dev); 218 int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, 219 struct generic_pm_domain *subdomain); 220 int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, 221 struct generic_pm_domain *subdomain); 222 int pm_genpd_init(struct generic_pm_domain *genpd, 223 struct dev_power_governor *gov, bool is_off); 224 int pm_genpd_remove(struct generic_pm_domain *genpd); 225 int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state); 226 int dev_pm_genpd_add_notifier(struct device *dev, struct notifier_block *nb); 227 int dev_pm_genpd_remove_notifier(struct device *dev); 228 void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next); 229 230 extern struct dev_power_governor simple_qos_governor; 231 extern struct dev_power_governor pm_domain_always_on_gov; 232 #ifdef CONFIG_CPU_IDLE 233 extern struct dev_power_governor pm_domain_cpu_gov; 234 #endif 235 #else 236 237 static inline struct generic_pm_domain_data *dev_gpd_data(struct device *dev) 238 { 239 return ERR_PTR(-ENOSYS); 240 } 241 static inline int pm_genpd_add_device(struct generic_pm_domain *genpd, 242 struct device *dev) 243 { 244 return -ENOSYS; 245 } 246 static inline int pm_genpd_remove_device(struct device *dev) 247 { 248 return -ENOSYS; 249 } 250 static inline int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, 251 struct generic_pm_domain *subdomain) 252 { 253 return -ENOSYS; 254 } 255 static inline int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, 256 struct generic_pm_domain *subdomain) 257 { 258 return -ENOSYS; 259 } 260 static inline int pm_genpd_init(struct generic_pm_domain *genpd, 261 struct dev_power_governor *gov, bool is_off) 262 { 263 return -ENOSYS; 264 } 265 static inline int pm_genpd_remove(struct generic_pm_domain *genpd) 266 { 267 return -EOPNOTSUPP; 268 } 269 270 static inline int dev_pm_genpd_set_performance_state(struct device *dev, 271 unsigned int state) 272 { 273 return -EOPNOTSUPP; 274 } 275 276 static inline int dev_pm_genpd_add_notifier(struct device *dev, 277 struct notifier_block *nb) 278 { 279 return -EOPNOTSUPP; 280 } 281 282 static inline int dev_pm_genpd_remove_notifier(struct device *dev) 283 { 284 return -EOPNOTSUPP; 285 } 286 287 static inline void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next) 288 { } 289 290 #define simple_qos_governor (*(struct dev_power_governor *)(NULL)) 291 #define pm_domain_always_on_gov (*(struct dev_power_governor *)(NULL)) 292 #endif 293 294 #ifdef CONFIG_PM_GENERIC_DOMAINS_SLEEP 295 void dev_pm_genpd_suspend(struct device *dev); 296 void dev_pm_genpd_resume(struct device *dev); 297 #else 298 static inline void dev_pm_genpd_suspend(struct device *dev) {} 299 static inline void dev_pm_genpd_resume(struct device *dev) {} 300 #endif 301 302 /* OF PM domain providers */ 303 struct of_device_id; 304 305 typedef struct generic_pm_domain *(*genpd_xlate_t)(struct of_phandle_args *args, 306 void *data); 307 308 struct genpd_onecell_data { 309 struct generic_pm_domain **domains; 310 unsigned int num_domains; 311 genpd_xlate_t xlate; 312 }; 313 314 #ifdef CONFIG_PM_GENERIC_DOMAINS_OF 315 int of_genpd_add_provider_simple(struct device_node *np, 316 struct generic_pm_domain *genpd); 317 int of_genpd_add_provider_onecell(struct device_node *np, 318 struct genpd_onecell_data *data); 319 void of_genpd_del_provider(struct device_node *np); 320 int of_genpd_add_device(struct of_phandle_args *args, struct device *dev); 321 int of_genpd_add_subdomain(struct of_phandle_args *parent_spec, 322 struct of_phandle_args *subdomain_spec); 323 int of_genpd_remove_subdomain(struct of_phandle_args *parent_spec, 324 struct of_phandle_args *subdomain_spec); 325 struct generic_pm_domain *of_genpd_remove_last(struct device_node *np); 326 int of_genpd_parse_idle_states(struct device_node *dn, 327 struct genpd_power_state **states, int *n); 328 unsigned int pm_genpd_opp_to_performance_state(struct device *genpd_dev, 329 struct dev_pm_opp *opp); 330 331 int genpd_dev_pm_attach(struct device *dev); 332 struct device *genpd_dev_pm_attach_by_id(struct device *dev, 333 unsigned int index); 334 struct device *genpd_dev_pm_attach_by_name(struct device *dev, 335 const char *name); 336 #else /* !CONFIG_PM_GENERIC_DOMAINS_OF */ 337 static inline int of_genpd_add_provider_simple(struct device_node *np, 338 struct generic_pm_domain *genpd) 339 { 340 return -EOPNOTSUPP; 341 } 342 343 static inline int of_genpd_add_provider_onecell(struct device_node *np, 344 struct genpd_onecell_data *data) 345 { 346 return -EOPNOTSUPP; 347 } 348 349 static inline void of_genpd_del_provider(struct device_node *np) {} 350 351 static inline int of_genpd_add_device(struct of_phandle_args *args, 352 struct device *dev) 353 { 354 return -ENODEV; 355 } 356 357 static inline int of_genpd_add_subdomain(struct of_phandle_args *parent_spec, 358 struct of_phandle_args *subdomain_spec) 359 { 360 return -ENODEV; 361 } 362 363 static inline int of_genpd_remove_subdomain(struct of_phandle_args *parent_spec, 364 struct of_phandle_args *subdomain_spec) 365 { 366 return -ENODEV; 367 } 368 369 static inline int of_genpd_parse_idle_states(struct device_node *dn, 370 struct genpd_power_state **states, int *n) 371 { 372 return -ENODEV; 373 } 374 375 static inline unsigned int 376 pm_genpd_opp_to_performance_state(struct device *genpd_dev, 377 struct dev_pm_opp *opp) 378 { 379 return 0; 380 } 381 382 static inline int genpd_dev_pm_attach(struct device *dev) 383 { 384 return 0; 385 } 386 387 static inline struct device *genpd_dev_pm_attach_by_id(struct device *dev, 388 unsigned int index) 389 { 390 return NULL; 391 } 392 393 static inline struct device *genpd_dev_pm_attach_by_name(struct device *dev, 394 const char *name) 395 { 396 return NULL; 397 } 398 399 static inline 400 struct generic_pm_domain *of_genpd_remove_last(struct device_node *np) 401 { 402 return ERR_PTR(-EOPNOTSUPP); 403 } 404 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ 405 406 #ifdef CONFIG_PM 407 int dev_pm_domain_attach(struct device *dev, bool power_on); 408 struct device *dev_pm_domain_attach_by_id(struct device *dev, 409 unsigned int index); 410 struct device *dev_pm_domain_attach_by_name(struct device *dev, 411 const char *name); 412 void dev_pm_domain_detach(struct device *dev, bool power_off); 413 int dev_pm_domain_start(struct device *dev); 414 void dev_pm_domain_set(struct device *dev, struct dev_pm_domain *pd); 415 #else 416 static inline int dev_pm_domain_attach(struct device *dev, bool power_on) 417 { 418 return 0; 419 } 420 static inline struct device *dev_pm_domain_attach_by_id(struct device *dev, 421 unsigned int index) 422 { 423 return NULL; 424 } 425 static inline struct device *dev_pm_domain_attach_by_name(struct device *dev, 426 const char *name) 427 { 428 return NULL; 429 } 430 static inline void dev_pm_domain_detach(struct device *dev, bool power_off) {} 431 static inline int dev_pm_domain_start(struct device *dev) 432 { 433 return 0; 434 } 435 static inline void dev_pm_domain_set(struct device *dev, 436 struct dev_pm_domain *pd) {} 437 #endif 438 439 #endif /* _LINUX_PM_DOMAIN_H */ 440