Greg Kroah-Hartman | 5de363b | 2019-04-02 15:32:01 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 2 | /* |
| 3 | * drivers/base/power/domain.c - Common code related to device power domains. |
| 4 | * |
| 5 | * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 6 | */ |
Joe Perches | 7a5bd12 | 2019-03-04 09:14:38 -0800 | [diff] [blame] | 7 | #define pr_fmt(fmt) "PM: " fmt |
| 8 | |
Geert Uytterhoeven | 93af5e9 | 2015-06-26 11:14:14 +0200 | [diff] [blame] | 9 | #include <linux/delay.h> |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 10 | #include <linux/kernel.h> |
| 11 | #include <linux/io.h> |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 12 | #include <linux/platform_device.h> |
Viresh Kumar | 6a0ae73 | 2018-04-05 15:53:34 +0530 | [diff] [blame] | 13 | #include <linux/pm_opp.h> |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 14 | #include <linux/pm_runtime.h> |
| 15 | #include <linux/pm_domain.h> |
Rafael J. Wysocki | 6ff7bb0d0 | 2012-05-01 21:34:07 +0200 | [diff] [blame] | 16 | #include <linux/pm_qos.h> |
Ulf Hansson | c11f6f5 | 2014-12-01 12:50:21 +0100 | [diff] [blame] | 17 | #include <linux/pm_clock.h> |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 18 | #include <linux/slab.h> |
| 19 | #include <linux/err.h> |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 20 | #include <linux/sched.h> |
| 21 | #include <linux/suspend.h> |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 22 | #include <linux/export.h> |
Ulf Hansson | eb594b7 | 2019-03-27 15:35:46 +0100 | [diff] [blame] | 23 | #include <linux/cpu.h> |
Thierry Strudel | 718072c | 2020-12-08 11:19:55 -0800 | [diff] [blame] | 24 | #include <linux/debugfs.h> |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 25 | |
Tomeu Vizoso | aa8e54b5 | 2016-01-07 16:46:14 +0100 | [diff] [blame] | 26 | #include "power.h" |
| 27 | |
Geert Uytterhoeven | 93af5e9 | 2015-06-26 11:14:14 +0200 | [diff] [blame] | 28 | #define GENPD_RETRY_MAX_MS 250 /* Approximate */ |
| 29 | |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 30 | #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ |
| 31 | ({ \ |
| 32 | type (*__routine)(struct device *__d); \ |
| 33 | type __ret = (type)0; \ |
| 34 | \ |
| 35 | __routine = genpd->dev_ops.callback; \ |
| 36 | if (__routine) { \ |
| 37 | __ret = __routine(dev); \ |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 38 | } \ |
| 39 | __ret; \ |
| 40 | }) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 41 | |
Rafael J. Wysocki | 5125bbf38 | 2011-07-13 12:31:52 +0200 | [diff] [blame] | 42 | static LIST_HEAD(gpd_list); |
| 43 | static DEFINE_MUTEX(gpd_list_lock); |
| 44 | |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 45 | struct genpd_lock_ops { |
| 46 | void (*lock)(struct generic_pm_domain *genpd); |
| 47 | void (*lock_nested)(struct generic_pm_domain *genpd, int depth); |
| 48 | int (*lock_interruptible)(struct generic_pm_domain *genpd); |
| 49 | void (*unlock)(struct generic_pm_domain *genpd); |
| 50 | }; |
| 51 | |
| 52 | static void genpd_lock_mtx(struct generic_pm_domain *genpd) |
| 53 | { |
| 54 | mutex_lock(&genpd->mlock); |
| 55 | } |
| 56 | |
| 57 | static void genpd_lock_nested_mtx(struct generic_pm_domain *genpd, |
| 58 | int depth) |
| 59 | { |
| 60 | mutex_lock_nested(&genpd->mlock, depth); |
| 61 | } |
| 62 | |
| 63 | static int genpd_lock_interruptible_mtx(struct generic_pm_domain *genpd) |
| 64 | { |
| 65 | return mutex_lock_interruptible(&genpd->mlock); |
| 66 | } |
| 67 | |
| 68 | static void genpd_unlock_mtx(struct generic_pm_domain *genpd) |
| 69 | { |
| 70 | return mutex_unlock(&genpd->mlock); |
| 71 | } |
| 72 | |
| 73 | static const struct genpd_lock_ops genpd_mtx_ops = { |
| 74 | .lock = genpd_lock_mtx, |
| 75 | .lock_nested = genpd_lock_nested_mtx, |
| 76 | .lock_interruptible = genpd_lock_interruptible_mtx, |
| 77 | .unlock = genpd_unlock_mtx, |
| 78 | }; |
| 79 | |
Lina Iyer | d716f47 | 2016-10-14 10:47:55 -0700 | [diff] [blame] | 80 | static void genpd_lock_spin(struct generic_pm_domain *genpd) |
| 81 | __acquires(&genpd->slock) |
| 82 | { |
| 83 | unsigned long flags; |
| 84 | |
| 85 | spin_lock_irqsave(&genpd->slock, flags); |
| 86 | genpd->lock_flags = flags; |
| 87 | } |
| 88 | |
| 89 | static void genpd_lock_nested_spin(struct generic_pm_domain *genpd, |
| 90 | int depth) |
| 91 | __acquires(&genpd->slock) |
| 92 | { |
| 93 | unsigned long flags; |
| 94 | |
| 95 | spin_lock_irqsave_nested(&genpd->slock, flags, depth); |
| 96 | genpd->lock_flags = flags; |
| 97 | } |
| 98 | |
| 99 | static int genpd_lock_interruptible_spin(struct generic_pm_domain *genpd) |
| 100 | __acquires(&genpd->slock) |
| 101 | { |
| 102 | unsigned long flags; |
| 103 | |
| 104 | spin_lock_irqsave(&genpd->slock, flags); |
| 105 | genpd->lock_flags = flags; |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | static void genpd_unlock_spin(struct generic_pm_domain *genpd) |
| 110 | __releases(&genpd->slock) |
| 111 | { |
| 112 | spin_unlock_irqrestore(&genpd->slock, genpd->lock_flags); |
| 113 | } |
| 114 | |
| 115 | static const struct genpd_lock_ops genpd_spin_ops = { |
| 116 | .lock = genpd_lock_spin, |
| 117 | .lock_nested = genpd_lock_nested_spin, |
| 118 | .lock_interruptible = genpd_lock_interruptible_spin, |
| 119 | .unlock = genpd_unlock_spin, |
| 120 | }; |
| 121 | |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 122 | #define genpd_lock(p) p->lock_ops->lock(p) |
| 123 | #define genpd_lock_nested(p, d) p->lock_ops->lock_nested(p, d) |
| 124 | #define genpd_lock_interruptible(p) p->lock_ops->lock_interruptible(p) |
| 125 | #define genpd_unlock(p) p->lock_ops->unlock(p) |
| 126 | |
Ulf Hansson | 49f618e | 2020-09-24 13:04:47 +0200 | [diff] [blame] | 127 | #define genpd_status_on(genpd) (genpd->status == GENPD_STATE_ON) |
Lina Iyer | d716f47 | 2016-10-14 10:47:55 -0700 | [diff] [blame] | 128 | #define genpd_is_irq_safe(genpd) (genpd->flags & GENPD_FLAG_IRQ_SAFE) |
Ulf Hansson | ffaa42e | 2017-03-20 11:19:21 +0100 | [diff] [blame] | 129 | #define genpd_is_always_on(genpd) (genpd->flags & GENPD_FLAG_ALWAYS_ON) |
Geert Uytterhoeven | 95a20ef | 2017-11-07 13:48:11 +0100 | [diff] [blame] | 130 | #define genpd_is_active_wakeup(genpd) (genpd->flags & GENPD_FLAG_ACTIVE_WAKEUP) |
Ulf Hansson | eb594b7 | 2019-03-27 15:35:46 +0100 | [diff] [blame] | 131 | #define genpd_is_cpu_domain(genpd) (genpd->flags & GENPD_FLAG_CPU_DOMAIN) |
Leonard Crestez | ed61e18 | 2019-04-30 15:06:11 +0000 | [diff] [blame] | 132 | #define genpd_is_rpm_always_on(genpd) (genpd->flags & GENPD_FLAG_RPM_ALWAYS_ON) |
Ulf Hansson | 3dd9151 | 2023-08-25 13:26:32 +0200 | [diff] [blame] | 133 | #define genpd_is_opp_table_fw(genpd) (genpd->flags & GENPD_FLAG_OPP_TABLE_FW) |
Lina Iyer | d716f47 | 2016-10-14 10:47:55 -0700 | [diff] [blame] | 134 | |
Ulf Hansson | 7a02444 | 2022-05-11 16:56:54 +0200 | [diff] [blame] | 135 | static inline bool irq_safe_dev_in_sleep_domain(struct device *dev, |
Krzysztof Kozlowski | d8600c8 | 2017-06-12 17:17:41 +0200 | [diff] [blame] | 136 | const struct generic_pm_domain *genpd) |
Lina Iyer | d716f47 | 2016-10-14 10:47:55 -0700 | [diff] [blame] | 137 | { |
| 138 | bool ret; |
| 139 | |
| 140 | ret = pm_runtime_is_irq_safe(dev) && !genpd_is_irq_safe(genpd); |
| 141 | |
Ulf Hansson | 075c37d | 2017-03-20 11:19:23 +0100 | [diff] [blame] | 142 | /* |
Ulf Hansson | 7a02444 | 2022-05-11 16:56:54 +0200 | [diff] [blame] | 143 | * Warn once if an IRQ safe device is attached to a domain, which |
| 144 | * callbacks are allowed to sleep. This indicates a suboptimal |
| 145 | * configuration for PM, but it doesn't matter for an always on domain. |
Ulf Hansson | 075c37d | 2017-03-20 11:19:23 +0100 | [diff] [blame] | 146 | */ |
Ulf Hansson | bcc19f6 | 2022-05-11 16:56:55 +0200 | [diff] [blame] | 147 | if (genpd_is_always_on(genpd) || genpd_is_rpm_always_on(genpd)) |
| 148 | return ret; |
| 149 | |
| 150 | if (ret) |
Lina Iyer | d716f47 | 2016-10-14 10:47:55 -0700 | [diff] [blame] | 151 | dev_warn_once(dev, "PM domain %s will not be powered off\n", |
| 152 | genpd->name); |
| 153 | |
| 154 | return ret; |
| 155 | } |
| 156 | |
Ulf Hansson | b3ad17c | 2019-08-29 16:48:05 +0200 | [diff] [blame] | 157 | static int genpd_runtime_suspend(struct device *dev); |
| 158 | |
Russell King | 446d999c | 2015-03-20 17:20:33 +0000 | [diff] [blame] | 159 | /* |
| 160 | * Get the generic PM domain for a particular struct device. |
| 161 | * This validates the struct device pointer, the PM domain pointer, |
| 162 | * and checks that the PM domain pointer is a real generic PM domain. |
| 163 | * Any failure results in NULL being returned. |
| 164 | */ |
Ulf Hansson | b3ad17c | 2019-08-29 16:48:05 +0200 | [diff] [blame] | 165 | static struct generic_pm_domain *dev_to_genpd_safe(struct device *dev) |
Russell King | 446d999c | 2015-03-20 17:20:33 +0000 | [diff] [blame] | 166 | { |
Russell King | 446d999c | 2015-03-20 17:20:33 +0000 | [diff] [blame] | 167 | if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain)) |
| 168 | return NULL; |
| 169 | |
Ulf Hansson | b3ad17c | 2019-08-29 16:48:05 +0200 | [diff] [blame] | 170 | /* A genpd's always have its ->runtime_suspend() callback assigned. */ |
| 171 | if (dev->pm_domain->ops.runtime_suspend == genpd_runtime_suspend) |
| 172 | return pd_to_genpd(dev->pm_domain); |
Russell King | 446d999c | 2015-03-20 17:20:33 +0000 | [diff] [blame] | 173 | |
Ulf Hansson | b3ad17c | 2019-08-29 16:48:05 +0200 | [diff] [blame] | 174 | return NULL; |
Russell King | 446d999c | 2015-03-20 17:20:33 +0000 | [diff] [blame] | 175 | } |
| 176 | |
| 177 | /* |
| 178 | * This should only be used where we are certain that the pm_domain |
| 179 | * attached to the device is a genpd domain. |
| 180 | */ |
| 181 | static struct generic_pm_domain *dev_to_genpd(struct device *dev) |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 182 | { |
| 183 | if (IS_ERR_OR_NULL(dev->pm_domain)) |
| 184 | return ERR_PTR(-EINVAL); |
| 185 | |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 186 | return pd_to_genpd(dev->pm_domain); |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 187 | } |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 188 | |
Krzysztof Kozlowski | d8600c8 | 2017-06-12 17:17:41 +0200 | [diff] [blame] | 189 | static int genpd_stop_dev(const struct generic_pm_domain *genpd, |
| 190 | struct device *dev) |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 191 | { |
Ulf Hansson | 2b1d88c | 2015-10-15 17:02:19 +0200 | [diff] [blame] | 192 | return GENPD_DEV_CALLBACK(genpd, int, stop, dev); |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 193 | } |
| 194 | |
Krzysztof Kozlowski | d8600c8 | 2017-06-12 17:17:41 +0200 | [diff] [blame] | 195 | static int genpd_start_dev(const struct generic_pm_domain *genpd, |
| 196 | struct device *dev) |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 197 | { |
Ulf Hansson | 2b1d88c | 2015-10-15 17:02:19 +0200 | [diff] [blame] | 198 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 199 | } |
| 200 | |
Rafael J. Wysocki | c4bb316 | 2011-08-08 23:43:04 +0200 | [diff] [blame] | 201 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 202 | { |
Rafael J. Wysocki | c4bb316 | 2011-08-08 23:43:04 +0200 | [diff] [blame] | 203 | bool ret = false; |
| 204 | |
| 205 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) |
| 206 | ret = !!atomic_dec_and_test(&genpd->sd_count); |
| 207 | |
| 208 | return ret; |
| 209 | } |
| 210 | |
| 211 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) |
| 212 | { |
| 213 | atomic_inc(&genpd->sd_count); |
Peter Zijlstra | 4e857c5 | 2014-03-17 18:06:10 +0100 | [diff] [blame] | 214 | smp_mb__after_atomic(); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 215 | } |
| 216 | |
Thara Gopinath | afece3a | 2017-07-14 13:10:15 -0400 | [diff] [blame] | 217 | #ifdef CONFIG_DEBUG_FS |
Thierry Strudel | 718072c | 2020-12-08 11:19:55 -0800 | [diff] [blame] | 218 | static struct dentry *genpd_debugfs_dir; |
| 219 | |
| 220 | static void genpd_debug_add(struct generic_pm_domain *genpd); |
| 221 | |
| 222 | static void genpd_debug_remove(struct generic_pm_domain *genpd) |
| 223 | { |
Hsin-Yi Wang | 37101d3 | 2022-07-06 01:16:49 +0800 | [diff] [blame] | 224 | if (!genpd_debugfs_dir) |
| 225 | return; |
| 226 | |
Greg Kroah-Hartman | 0b6200e | 2023-02-02 15:15:45 +0100 | [diff] [blame] | 227 | debugfs_lookup_and_remove(genpd->name, genpd_debugfs_dir); |
Thierry Strudel | 718072c | 2020-12-08 11:19:55 -0800 | [diff] [blame] | 228 | } |
| 229 | |
Thara Gopinath | afece3a | 2017-07-14 13:10:15 -0400 | [diff] [blame] | 230 | static void genpd_update_accounting(struct generic_pm_domain *genpd) |
| 231 | { |
Ulf Hansson | bd40cbb | 2022-04-19 19:29:16 +0200 | [diff] [blame] | 232 | u64 delta, now; |
Thara Gopinath | afece3a | 2017-07-14 13:10:15 -0400 | [diff] [blame] | 233 | |
Ulf Hansson | bd40cbb | 2022-04-19 19:29:16 +0200 | [diff] [blame] | 234 | now = ktime_get_mono_fast_ns(); |
| 235 | if (now <= genpd->accounting_time) |
| 236 | return; |
| 237 | |
| 238 | delta = now - genpd->accounting_time; |
Thara Gopinath | afece3a | 2017-07-14 13:10:15 -0400 | [diff] [blame] | 239 | |
| 240 | /* |
| 241 | * If genpd->status is active, it means we are just |
| 242 | * out of off and so update the idle time and vice |
| 243 | * versa. |
| 244 | */ |
Ulf Hansson | bd40cbb | 2022-04-19 19:29:16 +0200 | [diff] [blame] | 245 | if (genpd->status == GENPD_STATE_ON) |
| 246 | genpd->states[genpd->state_idx].idle_time += delta; |
| 247 | else |
| 248 | genpd->on_time += delta; |
Thara Gopinath | afece3a | 2017-07-14 13:10:15 -0400 | [diff] [blame] | 249 | |
| 250 | genpd->accounting_time = now; |
| 251 | } |
| 252 | #else |
Thierry Strudel | 718072c | 2020-12-08 11:19:55 -0800 | [diff] [blame] | 253 | static inline void genpd_debug_add(struct generic_pm_domain *genpd) {} |
| 254 | static inline void genpd_debug_remove(struct generic_pm_domain *genpd) {} |
Thara Gopinath | afece3a | 2017-07-14 13:10:15 -0400 | [diff] [blame] | 255 | static inline void genpd_update_accounting(struct generic_pm_domain *genpd) {} |
| 256 | #endif |
| 257 | |
Viresh Kumar | cd50c6d | 2018-10-31 14:56:54 +0530 | [diff] [blame] | 258 | static int _genpd_reeval_performance_state(struct generic_pm_domain *genpd, |
| 259 | unsigned int state) |
| 260 | { |
| 261 | struct generic_pm_domain_data *pd_data; |
| 262 | struct pm_domain_data *pdd; |
Viresh Kumar | 18edf49 | 2018-11-02 14:40:19 +0530 | [diff] [blame] | 263 | struct gpd_link *link; |
Viresh Kumar | cd50c6d | 2018-10-31 14:56:54 +0530 | [diff] [blame] | 264 | |
| 265 | /* New requested state is same as Max requested state */ |
| 266 | if (state == genpd->performance_state) |
| 267 | return state; |
| 268 | |
| 269 | /* New requested state is higher than Max requested state */ |
| 270 | if (state > genpd->performance_state) |
| 271 | return state; |
| 272 | |
| 273 | /* Traverse all devices within the domain */ |
| 274 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
| 275 | pd_data = to_gpd_data(pdd); |
| 276 | |
| 277 | if (pd_data->performance_state > state) |
| 278 | state = pd_data->performance_state; |
| 279 | } |
| 280 | |
| 281 | /* |
Viresh Kumar | 18edf49 | 2018-11-02 14:40:19 +0530 | [diff] [blame] | 282 | * Traverse all sub-domains within the domain. This can be |
| 283 | * done without any additional locking as the link->performance_state |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 284 | * field is protected by the parent genpd->lock, which is already taken. |
Viresh Kumar | 18edf49 | 2018-11-02 14:40:19 +0530 | [diff] [blame] | 285 | * |
| 286 | * Also note that link->performance_state (subdomain's performance state |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 287 | * requirement to parent domain) is different from |
| 288 | * link->child->performance_state (current performance state requirement |
Viresh Kumar | 18edf49 | 2018-11-02 14:40:19 +0530 | [diff] [blame] | 289 | * of the devices/sub-domains of the subdomain) and so can have a |
| 290 | * different value. |
| 291 | * |
| 292 | * Note that we also take vote from powered-off sub-domains into account |
| 293 | * as the same is done for devices right now. |
Viresh Kumar | cd50c6d | 2018-10-31 14:56:54 +0530 | [diff] [blame] | 294 | */ |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 295 | list_for_each_entry(link, &genpd->parent_links, parent_node) { |
Viresh Kumar | 18edf49 | 2018-11-02 14:40:19 +0530 | [diff] [blame] | 296 | if (link->performance_state > state) |
| 297 | state = link->performance_state; |
| 298 | } |
| 299 | |
Viresh Kumar | cd50c6d | 2018-10-31 14:56:54 +0530 | [diff] [blame] | 300 | return state; |
| 301 | } |
| 302 | |
Dmitry Osipenko | 079c42a | 2021-01-21 00:12:30 +0300 | [diff] [blame] | 303 | static int genpd_xlate_performance_state(struct generic_pm_domain *genpd, |
| 304 | struct generic_pm_domain *parent, |
| 305 | unsigned int pstate) |
| 306 | { |
| 307 | if (!parent->set_performance_state) |
| 308 | return pstate; |
| 309 | |
| 310 | return dev_pm_opp_xlate_performance_state(genpd->opp_table, |
| 311 | parent->opp_table, |
| 312 | pstate); |
| 313 | } |
| 314 | |
Viresh Kumar | cd50c6d | 2018-10-31 14:56:54 +0530 | [diff] [blame] | 315 | static int _genpd_set_performance_state(struct generic_pm_domain *genpd, |
Viresh Kumar | 18edf49 | 2018-11-02 14:40:19 +0530 | [diff] [blame] | 316 | unsigned int state, int depth) |
Viresh Kumar | cd50c6d | 2018-10-31 14:56:54 +0530 | [diff] [blame] | 317 | { |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 318 | struct generic_pm_domain *parent; |
Viresh Kumar | 18edf49 | 2018-11-02 14:40:19 +0530 | [diff] [blame] | 319 | struct gpd_link *link; |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 320 | int parent_state, ret; |
Viresh Kumar | cd50c6d | 2018-10-31 14:56:54 +0530 | [diff] [blame] | 321 | |
| 322 | if (state == genpd->performance_state) |
| 323 | return 0; |
| 324 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 325 | /* Propagate to parents of genpd */ |
| 326 | list_for_each_entry(link, &genpd->child_links, child_node) { |
| 327 | parent = link->parent; |
Viresh Kumar | 18edf49 | 2018-11-02 14:40:19 +0530 | [diff] [blame] | 328 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 329 | /* Find parent's performance state */ |
Dmitry Osipenko | 079c42a | 2021-01-21 00:12:30 +0300 | [diff] [blame] | 330 | ret = genpd_xlate_performance_state(genpd, parent, state); |
Viresh Kumar | 18edf49 | 2018-11-02 14:40:19 +0530 | [diff] [blame] | 331 | if (unlikely(ret < 0)) |
| 332 | goto err; |
| 333 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 334 | parent_state = ret; |
Viresh Kumar | 18edf49 | 2018-11-02 14:40:19 +0530 | [diff] [blame] | 335 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 336 | genpd_lock_nested(parent, depth + 1); |
Viresh Kumar | 18edf49 | 2018-11-02 14:40:19 +0530 | [diff] [blame] | 337 | |
| 338 | link->prev_performance_state = link->performance_state; |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 339 | link->performance_state = parent_state; |
| 340 | parent_state = _genpd_reeval_performance_state(parent, |
| 341 | parent_state); |
| 342 | ret = _genpd_set_performance_state(parent, parent_state, depth + 1); |
Viresh Kumar | 18edf49 | 2018-11-02 14:40:19 +0530 | [diff] [blame] | 343 | if (ret) |
| 344 | link->performance_state = link->prev_performance_state; |
| 345 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 346 | genpd_unlock(parent); |
Viresh Kumar | 18edf49 | 2018-11-02 14:40:19 +0530 | [diff] [blame] | 347 | |
| 348 | if (ret) |
| 349 | goto err; |
| 350 | } |
| 351 | |
Dmitry Osipenko | 079c42a | 2021-01-21 00:12:30 +0300 | [diff] [blame] | 352 | if (genpd->set_performance_state) { |
| 353 | ret = genpd->set_performance_state(genpd, state); |
| 354 | if (ret) |
| 355 | goto err; |
| 356 | } |
Viresh Kumar | cd50c6d | 2018-10-31 14:56:54 +0530 | [diff] [blame] | 357 | |
| 358 | genpd->performance_state = state; |
| 359 | return 0; |
Viresh Kumar | 18edf49 | 2018-11-02 14:40:19 +0530 | [diff] [blame] | 360 | |
| 361 | err: |
| 362 | /* Encountered an error, lets rollback */ |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 363 | list_for_each_entry_continue_reverse(link, &genpd->child_links, |
| 364 | child_node) { |
| 365 | parent = link->parent; |
Viresh Kumar | 18edf49 | 2018-11-02 14:40:19 +0530 | [diff] [blame] | 366 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 367 | genpd_lock_nested(parent, depth + 1); |
Viresh Kumar | 18edf49 | 2018-11-02 14:40:19 +0530 | [diff] [blame] | 368 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 369 | parent_state = link->prev_performance_state; |
| 370 | link->performance_state = parent_state; |
Viresh Kumar | 18edf49 | 2018-11-02 14:40:19 +0530 | [diff] [blame] | 371 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 372 | parent_state = _genpd_reeval_performance_state(parent, |
| 373 | parent_state); |
| 374 | if (_genpd_set_performance_state(parent, parent_state, depth + 1)) { |
Viresh Kumar | 18edf49 | 2018-11-02 14:40:19 +0530 | [diff] [blame] | 375 | pr_err("%s: Failed to roll back to %d performance state\n", |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 376 | parent->name, parent_state); |
Viresh Kumar | 18edf49 | 2018-11-02 14:40:19 +0530 | [diff] [blame] | 377 | } |
| 378 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 379 | genpd_unlock(parent); |
Viresh Kumar | 18edf49 | 2018-11-02 14:40:19 +0530 | [diff] [blame] | 380 | } |
| 381 | |
| 382 | return ret; |
Viresh Kumar | cd50c6d | 2018-10-31 14:56:54 +0530 | [diff] [blame] | 383 | } |
| 384 | |
Ulf Hansson | 0eef091 | 2021-06-03 11:34:35 +0200 | [diff] [blame] | 385 | static int genpd_set_performance_state(struct device *dev, unsigned int state) |
| 386 | { |
| 387 | struct generic_pm_domain *genpd = dev_to_genpd(dev); |
| 388 | struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev); |
| 389 | unsigned int prev_state; |
| 390 | int ret; |
| 391 | |
| 392 | prev_state = gpd_data->performance_state; |
Ulf Hansson | d97fe10 | 2021-06-03 11:34:36 +0200 | [diff] [blame] | 393 | if (prev_state == state) |
| 394 | return 0; |
| 395 | |
Ulf Hansson | 0eef091 | 2021-06-03 11:34:35 +0200 | [diff] [blame] | 396 | gpd_data->performance_state = state; |
| 397 | state = _genpd_reeval_performance_state(genpd, state); |
| 398 | |
| 399 | ret = _genpd_set_performance_state(genpd, state, 0); |
| 400 | if (ret) |
| 401 | gpd_data->performance_state = prev_state; |
| 402 | |
| 403 | return ret; |
| 404 | } |
| 405 | |
Ulf Hansson | 5937c3c | 2021-06-03 11:34:37 +0200 | [diff] [blame] | 406 | static int genpd_drop_performance_state(struct device *dev) |
| 407 | { |
| 408 | unsigned int prev_state = dev_gpd_data(dev)->performance_state; |
| 409 | |
| 410 | if (!genpd_set_performance_state(dev, 0)) |
| 411 | return prev_state; |
| 412 | |
| 413 | return 0; |
| 414 | } |
| 415 | |
| 416 | static void genpd_restore_performance_state(struct device *dev, |
| 417 | unsigned int state) |
| 418 | { |
| 419 | if (state) |
| 420 | genpd_set_performance_state(dev, state); |
| 421 | } |
| 422 | |
Ulf Hansson | 401e092 | 2023-09-25 15:17:08 +0200 | [diff] [blame] | 423 | static int genpd_dev_pm_set_performance_state(struct device *dev, |
| 424 | unsigned int state) |
| 425 | { |
| 426 | struct generic_pm_domain *genpd = dev_to_genpd(dev); |
| 427 | int ret = 0; |
| 428 | |
| 429 | genpd_lock(genpd); |
| 430 | if (pm_runtime_suspended(dev)) { |
| 431 | dev_gpd_data(dev)->rpm_pstate = state; |
| 432 | } else { |
| 433 | ret = genpd_set_performance_state(dev, state); |
| 434 | if (!ret) |
| 435 | dev_gpd_data(dev)->rpm_pstate = 0; |
| 436 | } |
| 437 | genpd_unlock(genpd); |
| 438 | |
| 439 | return ret; |
| 440 | } |
| 441 | |
Viresh Kumar | 42f6284 | 2017-10-12 15:07:23 +0530 | [diff] [blame] | 442 | /** |
| 443 | * dev_pm_genpd_set_performance_state- Set performance state of device's power |
| 444 | * domain. |
| 445 | * |
| 446 | * @dev: Device for which the performance-state needs to be set. |
| 447 | * @state: Target performance state of the device. This can be set as 0 when the |
| 448 | * device doesn't have any performance state constraints left (And so |
| 449 | * the device wouldn't participate anymore to find the target |
| 450 | * performance state of the genpd). |
| 451 | * |
| 452 | * It is assumed that the users guarantee that the genpd wouldn't be detached |
| 453 | * while this routine is getting called. |
| 454 | * |
| 455 | * Returns 0 on success and negative error values on failures. |
| 456 | */ |
| 457 | int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state) |
| 458 | { |
| 459 | struct generic_pm_domain *genpd; |
Viresh Kumar | 42f6284 | 2017-10-12 15:07:23 +0530 | [diff] [blame] | 460 | |
Ulf Hansson | 3ea4ca9 | 2019-08-29 16:48:15 +0200 | [diff] [blame] | 461 | genpd = dev_to_genpd_safe(dev); |
| 462 | if (!genpd) |
Viresh Kumar | 42f6284 | 2017-10-12 15:07:23 +0530 | [diff] [blame] | 463 | return -ENODEV; |
| 464 | |
Yangtao Li | e757e7f | 2019-04-16 12:23:05 -0400 | [diff] [blame] | 465 | if (WARN_ON(!dev->power.subsys_data || |
| 466 | !dev->power.subsys_data->domain_data)) |
Viresh Kumar | 42f6284 | 2017-10-12 15:07:23 +0530 | [diff] [blame] | 467 | return -EINVAL; |
Viresh Kumar | 42f6284 | 2017-10-12 15:07:23 +0530 | [diff] [blame] | 468 | |
Ulf Hansson | 401e092 | 2023-09-25 15:17:08 +0200 | [diff] [blame] | 469 | return genpd_dev_pm_set_performance_state(dev, state); |
Viresh Kumar | 42f6284 | 2017-10-12 15:07:23 +0530 | [diff] [blame] | 470 | } |
| 471 | EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state); |
| 472 | |
Lina Iyer | 67e3242 | 2021-01-20 08:50:41 -0700 | [diff] [blame] | 473 | /** |
| 474 | * dev_pm_genpd_set_next_wakeup - Notify PM framework of an impending wakeup. |
| 475 | * |
| 476 | * @dev: Device to handle |
| 477 | * @next: impending interrupt/wakeup for the device |
| 478 | * |
| 479 | * |
| 480 | * Allow devices to inform of the next wakeup. It's assumed that the users |
| 481 | * guarantee that the genpd wouldn't be detached while this routine is getting |
| 482 | * called. Additionally, it's also assumed that @dev isn't runtime suspended |
| 483 | * (RPM_SUSPENDED)." |
| 484 | * Although devices are expected to update the next_wakeup after the end of |
| 485 | * their usecase as well, it is possible the devices themselves may not know |
| 486 | * about that, so stale @next will be ignored when powering off the domain. |
| 487 | */ |
| 488 | void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next) |
| 489 | { |
Lina Iyer | 67e3242 | 2021-01-20 08:50:41 -0700 | [diff] [blame] | 490 | struct generic_pm_domain *genpd; |
Ulf Hansson | 9c74f2a | 2022-05-11 16:56:57 +0200 | [diff] [blame] | 491 | struct gpd_timing_data *td; |
Lina Iyer | 67e3242 | 2021-01-20 08:50:41 -0700 | [diff] [blame] | 492 | |
| 493 | genpd = dev_to_genpd_safe(dev); |
| 494 | if (!genpd) |
| 495 | return; |
| 496 | |
Ulf Hansson | 9c74f2a | 2022-05-11 16:56:57 +0200 | [diff] [blame] | 497 | td = to_gpd_data(dev->power.subsys_data->domain_data)->td; |
| 498 | if (td) |
| 499 | td->next_wakeup = next; |
Lina Iyer | 67e3242 | 2021-01-20 08:50:41 -0700 | [diff] [blame] | 500 | } |
| 501 | EXPORT_SYMBOL_GPL(dev_pm_genpd_set_next_wakeup); |
| 502 | |
Maulik Shah | 1498c50 | 2022-10-18 17:28:35 +0200 | [diff] [blame] | 503 | /** |
| 504 | * dev_pm_genpd_get_next_hrtimer - Return the next_hrtimer for the genpd |
| 505 | * @dev: A device that is attached to the genpd. |
| 506 | * |
| 507 | * This routine should typically be called for a device, at the point of when a |
| 508 | * GENPD_NOTIFY_PRE_OFF notification has been sent for it. |
| 509 | * |
| 510 | * Returns the aggregated value of the genpd's next hrtimer or KTIME_MAX if no |
| 511 | * valid value have been set. |
| 512 | */ |
| 513 | ktime_t dev_pm_genpd_get_next_hrtimer(struct device *dev) |
| 514 | { |
| 515 | struct generic_pm_domain *genpd; |
| 516 | |
| 517 | genpd = dev_to_genpd_safe(dev); |
| 518 | if (!genpd) |
| 519 | return KTIME_MAX; |
| 520 | |
| 521 | if (genpd->gd) |
| 522 | return genpd->gd->next_hrtimer; |
| 523 | |
| 524 | return KTIME_MAX; |
| 525 | } |
| 526 | EXPORT_SYMBOL_GPL(dev_pm_genpd_get_next_hrtimer); |
| 527 | |
Ulf Hansson | a9236a0 | 2023-01-02 16:18:27 +0530 | [diff] [blame] | 528 | /* |
| 529 | * dev_pm_genpd_synced_poweroff - Next power off should be synchronous |
| 530 | * |
| 531 | * @dev: A device that is attached to the genpd. |
| 532 | * |
| 533 | * Allows a consumer of the genpd to notify the provider that the next power off |
| 534 | * should be synchronous. |
| 535 | * |
| 536 | * It is assumed that the users guarantee that the genpd wouldn't be detached |
| 537 | * while this routine is getting called. |
| 538 | */ |
| 539 | void dev_pm_genpd_synced_poweroff(struct device *dev) |
| 540 | { |
| 541 | struct generic_pm_domain *genpd; |
| 542 | |
| 543 | genpd = dev_to_genpd_safe(dev); |
| 544 | if (!genpd) |
| 545 | return; |
| 546 | |
| 547 | genpd_lock(genpd); |
| 548 | genpd->synced_poweroff = true; |
| 549 | genpd_unlock(genpd); |
| 550 | } |
| 551 | EXPORT_SYMBOL_GPL(dev_pm_genpd_synced_poweroff); |
| 552 | |
Ulf Hansson | 86e12ea | 2016-12-08 14:45:20 +0100 | [diff] [blame] | 553 | static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed) |
Geert Uytterhoeven | c8f0ea4 | 2014-11-10 19:39:19 +0100 | [diff] [blame] | 554 | { |
Axel Haslam | fc5cbf0 | 2016-02-15 11:10:51 +0100 | [diff] [blame] | 555 | unsigned int state_idx = genpd->state_idx; |
Geert Uytterhoeven | c8f0ea4 | 2014-11-10 19:39:19 +0100 | [diff] [blame] | 556 | ktime_t time_start; |
| 557 | s64 elapsed_ns; |
Ulf Hansson | 330e393 | 2020-10-20 10:10:35 +0200 | [diff] [blame] | 558 | int ret; |
Ulf Hansson | d4f8138 | 2020-10-13 14:23:39 +0200 | [diff] [blame] | 559 | |
| 560 | /* Notify consumers that we are about to power on. */ |
Ulf Hansson | 330e393 | 2020-10-20 10:10:35 +0200 | [diff] [blame] | 561 | ret = raw_notifier_call_chain_robust(&genpd->power_notifiers, |
| 562 | GENPD_NOTIFY_PRE_ON, |
| 563 | GENPD_NOTIFY_OFF, NULL); |
Ulf Hansson | d4f8138 | 2020-10-13 14:23:39 +0200 | [diff] [blame] | 564 | ret = notifier_to_errno(ret); |
| 565 | if (ret) |
Ulf Hansson | 330e393 | 2020-10-20 10:10:35 +0200 | [diff] [blame] | 566 | return ret; |
Geert Uytterhoeven | c8f0ea4 | 2014-11-10 19:39:19 +0100 | [diff] [blame] | 567 | |
| 568 | if (!genpd->power_on) |
Ulf Hansson | d4f8138 | 2020-10-13 14:23:39 +0200 | [diff] [blame] | 569 | goto out; |
Geert Uytterhoeven | c8f0ea4 | 2014-11-10 19:39:19 +0100 | [diff] [blame] | 570 | |
Ulf Hansson | b2a92f3 | 2022-05-11 16:57:04 +0200 | [diff] [blame] | 571 | timed = timed && genpd->gd && !genpd->states[state_idx].fwnode; |
Ulf Hansson | d4f8138 | 2020-10-13 14:23:39 +0200 | [diff] [blame] | 572 | if (!timed) { |
| 573 | ret = genpd->power_on(genpd); |
| 574 | if (ret) |
| 575 | goto err; |
| 576 | |
| 577 | goto out; |
| 578 | } |
Geert Uytterhoeven | a4630c6 | 2015-05-29 17:24:23 +0200 | [diff] [blame] | 579 | |
Geert Uytterhoeven | c8f0ea4 | 2014-11-10 19:39:19 +0100 | [diff] [blame] | 580 | time_start = ktime_get(); |
| 581 | ret = genpd->power_on(genpd); |
| 582 | if (ret) |
Ulf Hansson | d4f8138 | 2020-10-13 14:23:39 +0200 | [diff] [blame] | 583 | goto err; |
Geert Uytterhoeven | c8f0ea4 | 2014-11-10 19:39:19 +0100 | [diff] [blame] | 584 | |
| 585 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
Axel Haslam | fc5cbf0 | 2016-02-15 11:10:51 +0100 | [diff] [blame] | 586 | if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns) |
Ulf Hansson | d4f8138 | 2020-10-13 14:23:39 +0200 | [diff] [blame] | 587 | goto out; |
Geert Uytterhoeven | c8f0ea4 | 2014-11-10 19:39:19 +0100 | [diff] [blame] | 588 | |
Axel Haslam | fc5cbf0 | 2016-02-15 11:10:51 +0100 | [diff] [blame] | 589 | genpd->states[state_idx].power_on_latency_ns = elapsed_ns; |
Ulf Hansson | 6961795 | 2022-05-11 16:57:03 +0200 | [diff] [blame] | 590 | genpd->gd->max_off_time_changed = true; |
Russell King | 6d7d5c3 | 2015-03-20 17:20:28 +0000 | [diff] [blame] | 591 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
| 592 | genpd->name, "on", elapsed_ns); |
Geert Uytterhoeven | c8f0ea4 | 2014-11-10 19:39:19 +0100 | [diff] [blame] | 593 | |
Ulf Hansson | d4f8138 | 2020-10-13 14:23:39 +0200 | [diff] [blame] | 594 | out: |
| 595 | raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_ON, NULL); |
Ulf Hansson | a9236a0 | 2023-01-02 16:18:27 +0530 | [diff] [blame] | 596 | genpd->synced_poweroff = false; |
Ulf Hansson | d4f8138 | 2020-10-13 14:23:39 +0200 | [diff] [blame] | 597 | return 0; |
| 598 | err: |
| 599 | raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_OFF, |
| 600 | NULL); |
Geert Uytterhoeven | c8f0ea4 | 2014-11-10 19:39:19 +0100 | [diff] [blame] | 601 | return ret; |
| 602 | } |
| 603 | |
Ulf Hansson | 86e12ea | 2016-12-08 14:45:20 +0100 | [diff] [blame] | 604 | static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed) |
Geert Uytterhoeven | c8f0ea4 | 2014-11-10 19:39:19 +0100 | [diff] [blame] | 605 | { |
Axel Haslam | fc5cbf0 | 2016-02-15 11:10:51 +0100 | [diff] [blame] | 606 | unsigned int state_idx = genpd->state_idx; |
Geert Uytterhoeven | c8f0ea4 | 2014-11-10 19:39:19 +0100 | [diff] [blame] | 607 | ktime_t time_start; |
| 608 | s64 elapsed_ns; |
Ulf Hansson | 330e393 | 2020-10-20 10:10:35 +0200 | [diff] [blame] | 609 | int ret; |
Ulf Hansson | d4f8138 | 2020-10-13 14:23:39 +0200 | [diff] [blame] | 610 | |
| 611 | /* Notify consumers that we are about to power off. */ |
Ulf Hansson | 330e393 | 2020-10-20 10:10:35 +0200 | [diff] [blame] | 612 | ret = raw_notifier_call_chain_robust(&genpd->power_notifiers, |
| 613 | GENPD_NOTIFY_PRE_OFF, |
| 614 | GENPD_NOTIFY_ON, NULL); |
Ulf Hansson | d4f8138 | 2020-10-13 14:23:39 +0200 | [diff] [blame] | 615 | ret = notifier_to_errno(ret); |
| 616 | if (ret) |
Ulf Hansson | 330e393 | 2020-10-20 10:10:35 +0200 | [diff] [blame] | 617 | return ret; |
Geert Uytterhoeven | c8f0ea4 | 2014-11-10 19:39:19 +0100 | [diff] [blame] | 618 | |
| 619 | if (!genpd->power_off) |
Ulf Hansson | d4f8138 | 2020-10-13 14:23:39 +0200 | [diff] [blame] | 620 | goto out; |
Geert Uytterhoeven | c8f0ea4 | 2014-11-10 19:39:19 +0100 | [diff] [blame] | 621 | |
Ulf Hansson | b2a92f3 | 2022-05-11 16:57:04 +0200 | [diff] [blame] | 622 | timed = timed && genpd->gd && !genpd->states[state_idx].fwnode; |
Ulf Hansson | d4f8138 | 2020-10-13 14:23:39 +0200 | [diff] [blame] | 623 | if (!timed) { |
| 624 | ret = genpd->power_off(genpd); |
| 625 | if (ret) |
| 626 | goto busy; |
| 627 | |
| 628 | goto out; |
| 629 | } |
Geert Uytterhoeven | a4630c6 | 2015-05-29 17:24:23 +0200 | [diff] [blame] | 630 | |
Geert Uytterhoeven | c8f0ea4 | 2014-11-10 19:39:19 +0100 | [diff] [blame] | 631 | time_start = ktime_get(); |
| 632 | ret = genpd->power_off(genpd); |
Aisheng Dong | 0cec68a | 2019-03-06 13:25:15 +0000 | [diff] [blame] | 633 | if (ret) |
Ulf Hansson | d4f8138 | 2020-10-13 14:23:39 +0200 | [diff] [blame] | 634 | goto busy; |
Geert Uytterhoeven | c8f0ea4 | 2014-11-10 19:39:19 +0100 | [diff] [blame] | 635 | |
| 636 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
Axel Haslam | fc5cbf0 | 2016-02-15 11:10:51 +0100 | [diff] [blame] | 637 | if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns) |
Ulf Hansson | d4f8138 | 2020-10-13 14:23:39 +0200 | [diff] [blame] | 638 | goto out; |
Geert Uytterhoeven | c8f0ea4 | 2014-11-10 19:39:19 +0100 | [diff] [blame] | 639 | |
Axel Haslam | fc5cbf0 | 2016-02-15 11:10:51 +0100 | [diff] [blame] | 640 | genpd->states[state_idx].power_off_latency_ns = elapsed_ns; |
Ulf Hansson | 6961795 | 2022-05-11 16:57:03 +0200 | [diff] [blame] | 641 | genpd->gd->max_off_time_changed = true; |
Russell King | 6d7d5c3 | 2015-03-20 17:20:28 +0000 | [diff] [blame] | 642 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
| 643 | genpd->name, "off", elapsed_ns); |
Geert Uytterhoeven | c8f0ea4 | 2014-11-10 19:39:19 +0100 | [diff] [blame] | 644 | |
Ulf Hansson | d4f8138 | 2020-10-13 14:23:39 +0200 | [diff] [blame] | 645 | out: |
| 646 | raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_OFF, |
| 647 | NULL); |
Aisheng Dong | 0cec68a | 2019-03-06 13:25:15 +0000 | [diff] [blame] | 648 | return 0; |
Ulf Hansson | d4f8138 | 2020-10-13 14:23:39 +0200 | [diff] [blame] | 649 | busy: |
Ulf Hansson | 330e393 | 2020-10-20 10:10:35 +0200 | [diff] [blame] | 650 | raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_ON, NULL); |
Ulf Hansson | d4f8138 | 2020-10-13 14:23:39 +0200 | [diff] [blame] | 651 | return ret; |
Geert Uytterhoeven | c8f0ea4 | 2014-11-10 19:39:19 +0100 | [diff] [blame] | 652 | } |
| 653 | |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 654 | /** |
Ulf Hansson | 86e12ea | 2016-12-08 14:45:20 +0100 | [diff] [blame] | 655 | * genpd_queue_power_off_work - Queue up the execution of genpd_power_off(). |
Moritz Fischer | a3d09c7 | 2016-01-27 08:29:27 +0100 | [diff] [blame] | 656 | * @genpd: PM domain to power off. |
Ulf Hansson | 29e47e2 | 2015-09-02 10:16:13 +0200 | [diff] [blame] | 657 | * |
Ulf Hansson | 86e12ea | 2016-12-08 14:45:20 +0100 | [diff] [blame] | 658 | * Queue up the execution of genpd_power_off() unless it's already been done |
Ulf Hansson | 29e47e2 | 2015-09-02 10:16:13 +0200 | [diff] [blame] | 659 | * before. |
| 660 | */ |
| 661 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) |
| 662 | { |
| 663 | queue_work(pm_wq, &genpd->power_off_work); |
| 664 | } |
| 665 | |
| 666 | /** |
Ulf Hansson | 1f8728b | 2017-02-17 10:55:23 +0100 | [diff] [blame] | 667 | * genpd_power_off - Remove power from a given PM domain. |
| 668 | * @genpd: PM domain to power down. |
Ulf Hansson | 3c64649 | 2017-02-17 10:55:24 +0100 | [diff] [blame] | 669 | * @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the |
| 670 | * RPM status of the releated device is in an intermediate state, not yet turned |
| 671 | * into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not |
| 672 | * be RPM_SUSPENDED, while it tries to power off the PM domain. |
Yang Yingliang | 763663c | 2021-05-12 15:25:15 +0800 | [diff] [blame] | 673 | * @depth: nesting count for lockdep. |
Ulf Hansson | 1f8728b | 2017-02-17 10:55:23 +0100 | [diff] [blame] | 674 | * |
| 675 | * If all of the @genpd's devices have been suspended and all of its subdomains |
| 676 | * have been powered down, remove power from @genpd. |
| 677 | */ |
Ulf Hansson | 2da8354 | 2017-02-17 10:55:25 +0100 | [diff] [blame] | 678 | static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on, |
| 679 | unsigned int depth) |
Ulf Hansson | 1f8728b | 2017-02-17 10:55:23 +0100 | [diff] [blame] | 680 | { |
| 681 | struct pm_domain_data *pdd; |
| 682 | struct gpd_link *link; |
| 683 | unsigned int not_suspended = 0; |
Ulf Hansson | f63816e | 2020-09-24 13:04:48 +0200 | [diff] [blame] | 684 | int ret; |
Ulf Hansson | 1f8728b | 2017-02-17 10:55:23 +0100 | [diff] [blame] | 685 | |
| 686 | /* |
| 687 | * Do not try to power off the domain in the following situations: |
| 688 | * (1) The domain is already in the "power off" state. |
| 689 | * (2) System suspend is in progress. |
| 690 | */ |
Ulf Hansson | 41e2c8e | 2017-03-20 11:19:20 +0100 | [diff] [blame] | 691 | if (!genpd_status_on(genpd) || genpd->prepared_count > 0) |
Ulf Hansson | 1f8728b | 2017-02-17 10:55:23 +0100 | [diff] [blame] | 692 | return 0; |
| 693 | |
Ulf Hansson | ffaa42e | 2017-03-20 11:19:21 +0100 | [diff] [blame] | 694 | /* |
| 695 | * Abort power off for the PM domain in the following situations: |
| 696 | * (1) The domain is configured as always on. |
| 697 | * (2) When the domain has a subdomain being powered on. |
| 698 | */ |
Leonard Crestez | ed61e18 | 2019-04-30 15:06:11 +0000 | [diff] [blame] | 699 | if (genpd_is_always_on(genpd) || |
| 700 | genpd_is_rpm_always_on(genpd) || |
| 701 | atomic_read(&genpd->sd_count) > 0) |
Ulf Hansson | 1f8728b | 2017-02-17 10:55:23 +0100 | [diff] [blame] | 702 | return -EBUSY; |
| 703 | |
Ulf Hansson | e7d90cf | 2022-02-17 13:49:50 +0100 | [diff] [blame] | 704 | /* |
| 705 | * The children must be in their deepest (powered-off) states to allow |
| 706 | * the parent to be powered off. Note that, there's no need for |
| 707 | * additional locking, as powering on a child, requires the parent's |
| 708 | * lock to be acquired first. |
| 709 | */ |
| 710 | list_for_each_entry(link, &genpd->parent_links, parent_node) { |
| 711 | struct generic_pm_domain *child = link->child; |
| 712 | if (child->state_idx < child->state_count - 1) |
| 713 | return -EBUSY; |
| 714 | } |
| 715 | |
Ulf Hansson | 1f8728b | 2017-02-17 10:55:23 +0100 | [diff] [blame] | 716 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
Ulf Hansson | 1f8728b | 2017-02-17 10:55:23 +0100 | [diff] [blame] | 717 | /* |
| 718 | * Do not allow PM domain to be powered off, when an IRQ safe |
| 719 | * device is part of a non-IRQ safe domain. |
| 720 | */ |
| 721 | if (!pm_runtime_suspended(pdd->dev) || |
Ulf Hansson | 7a02444 | 2022-05-11 16:56:54 +0200 | [diff] [blame] | 722 | irq_safe_dev_in_sleep_domain(pdd->dev, genpd)) |
Ulf Hansson | 1f8728b | 2017-02-17 10:55:23 +0100 | [diff] [blame] | 723 | not_suspended++; |
| 724 | } |
| 725 | |
Ulf Hansson | 3c64649 | 2017-02-17 10:55:24 +0100 | [diff] [blame] | 726 | if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on)) |
Ulf Hansson | 1f8728b | 2017-02-17 10:55:23 +0100 | [diff] [blame] | 727 | return -EBUSY; |
| 728 | |
| 729 | if (genpd->gov && genpd->gov->power_down_ok) { |
| 730 | if (!genpd->gov->power_down_ok(&genpd->domain)) |
| 731 | return -EAGAIN; |
| 732 | } |
| 733 | |
Ulf Hansson | 2c9b7f8 | 2018-10-03 16:38:15 +0200 | [diff] [blame] | 734 | /* Default to shallowest state. */ |
| 735 | if (!genpd->gov) |
| 736 | genpd->state_idx = 0; |
| 737 | |
Ulf Hansson | f63816e | 2020-09-24 13:04:48 +0200 | [diff] [blame] | 738 | /* Don't power off, if a child domain is waiting to power on. */ |
| 739 | if (atomic_read(&genpd->sd_count) > 0) |
| 740 | return -EBUSY; |
Ulf Hansson | 1f8728b | 2017-02-17 10:55:23 +0100 | [diff] [blame] | 741 | |
Ulf Hansson | f63816e | 2020-09-24 13:04:48 +0200 | [diff] [blame] | 742 | ret = _genpd_power_off(genpd, true); |
Lina Iyer | c6a113b | 2020-10-15 14:47:22 -0600 | [diff] [blame] | 743 | if (ret) { |
| 744 | genpd->states[genpd->state_idx].rejected++; |
Ulf Hansson | f63816e | 2020-09-24 13:04:48 +0200 | [diff] [blame] | 745 | return ret; |
Lina Iyer | c6a113b | 2020-10-15 14:47:22 -0600 | [diff] [blame] | 746 | } |
Ulf Hansson | 1f8728b | 2017-02-17 10:55:23 +0100 | [diff] [blame] | 747 | |
Ulf Hansson | 49f618e | 2020-09-24 13:04:47 +0200 | [diff] [blame] | 748 | genpd->status = GENPD_STATE_OFF; |
Thara Gopinath | afece3a | 2017-07-14 13:10:15 -0400 | [diff] [blame] | 749 | genpd_update_accounting(genpd); |
Lina Iyer | c6a113b | 2020-10-15 14:47:22 -0600 | [diff] [blame] | 750 | genpd->states[genpd->state_idx].usage++; |
Ulf Hansson | 1f8728b | 2017-02-17 10:55:23 +0100 | [diff] [blame] | 751 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 752 | list_for_each_entry(link, &genpd->child_links, child_node) { |
| 753 | genpd_sd_counter_dec(link->parent); |
| 754 | genpd_lock_nested(link->parent, depth + 1); |
| 755 | genpd_power_off(link->parent, false, depth + 1); |
| 756 | genpd_unlock(link->parent); |
Ulf Hansson | 1f8728b | 2017-02-17 10:55:23 +0100 | [diff] [blame] | 757 | } |
| 758 | |
| 759 | return 0; |
| 760 | } |
| 761 | |
| 762 | /** |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 763 | * genpd_power_on - Restore power to a given PM domain and its parents. |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 764 | * @genpd: PM domain to power up. |
Marek Szyprowski | 0106ef5 | 2016-01-20 10:13:42 +0100 | [diff] [blame] | 765 | * @depth: nesting count for lockdep. |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 766 | * |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 767 | * Restore power to @genpd and all of its parents so that it is possible to |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 768 | * resume a device belonging to it. |
| 769 | */ |
Ulf Hansson | 86e12ea | 2016-12-08 14:45:20 +0100 | [diff] [blame] | 770 | static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth) |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 771 | { |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 772 | struct gpd_link *link; |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 773 | int ret = 0; |
| 774 | |
Ulf Hansson | 41e2c8e | 2017-03-20 11:19:20 +0100 | [diff] [blame] | 775 | if (genpd_status_on(genpd)) |
Rafael J. Wysocki | 3f24177 | 2011-08-08 23:43:29 +0200 | [diff] [blame] | 776 | return 0; |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 777 | |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 778 | /* |
| 779 | * The list is guaranteed not to change while the loop below is being |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 780 | * executed, unless one of the parents' .power_on() callbacks fiddles |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 781 | * with it. |
| 782 | */ |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 783 | list_for_each_entry(link, &genpd->child_links, child_node) { |
| 784 | struct generic_pm_domain *parent = link->parent; |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 785 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 786 | genpd_sd_counter_inc(parent); |
Marek Szyprowski | 0106ef5 | 2016-01-20 10:13:42 +0100 | [diff] [blame] | 787 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 788 | genpd_lock_nested(parent, depth + 1); |
| 789 | ret = genpd_power_on(parent, depth + 1); |
| 790 | genpd_unlock(parent); |
Marek Szyprowski | 0106ef5 | 2016-01-20 10:13:42 +0100 | [diff] [blame] | 791 | |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 792 | if (ret) { |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 793 | genpd_sd_counter_dec(parent); |
Rafael J. Wysocki | 9e08cf4 | 2011-08-08 23:43:22 +0200 | [diff] [blame] | 794 | goto err; |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 795 | } |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 796 | } |
| 797 | |
Ulf Hansson | 86e12ea | 2016-12-08 14:45:20 +0100 | [diff] [blame] | 798 | ret = _genpd_power_on(genpd, true); |
Geert Uytterhoeven | c8f0ea4 | 2014-11-10 19:39:19 +0100 | [diff] [blame] | 799 | if (ret) |
| 800 | goto err; |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 801 | |
Ulf Hansson | 49f618e | 2020-09-24 13:04:47 +0200 | [diff] [blame] | 802 | genpd->status = GENPD_STATE_ON; |
Thara Gopinath | afece3a | 2017-07-14 13:10:15 -0400 | [diff] [blame] | 803 | genpd_update_accounting(genpd); |
| 804 | |
Rafael J. Wysocki | 3f24177 | 2011-08-08 23:43:29 +0200 | [diff] [blame] | 805 | return 0; |
Rafael J. Wysocki | 9e08cf4 | 2011-08-08 23:43:22 +0200 | [diff] [blame] | 806 | |
| 807 | err: |
Ulf Hansson | 29e47e2 | 2015-09-02 10:16:13 +0200 | [diff] [blame] | 808 | list_for_each_entry_continue_reverse(link, |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 809 | &genpd->child_links, |
| 810 | child_node) { |
| 811 | genpd_sd_counter_dec(link->parent); |
| 812 | genpd_lock_nested(link->parent, depth + 1); |
| 813 | genpd_power_off(link->parent, false, depth + 1); |
| 814 | genpd_unlock(link->parent); |
Ulf Hansson | 29e47e2 | 2015-09-02 10:16:13 +0200 | [diff] [blame] | 815 | } |
Rafael J. Wysocki | 9e08cf4 | 2011-08-08 23:43:22 +0200 | [diff] [blame] | 816 | |
Rafael J. Wysocki | 3f24177 | 2011-08-08 23:43:29 +0200 | [diff] [blame] | 817 | return ret; |
| 818 | } |
| 819 | |
Ulf Hansson | ea71c59 | 2019-10-16 15:16:24 +0200 | [diff] [blame] | 820 | static int genpd_dev_pm_start(struct device *dev) |
| 821 | { |
| 822 | struct generic_pm_domain *genpd = dev_to_genpd(dev); |
| 823 | |
| 824 | return genpd_start_dev(genpd, dev); |
| 825 | } |
| 826 | |
Rafael J. Wysocki | 6ff7bb0d0 | 2012-05-01 21:34:07 +0200 | [diff] [blame] | 827 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
| 828 | unsigned long val, void *ptr) |
| 829 | { |
| 830 | struct generic_pm_domain_data *gpd_data; |
| 831 | struct device *dev; |
| 832 | |
| 833 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); |
Rafael J. Wysocki | 6ff7bb0d0 | 2012-05-01 21:34:07 +0200 | [diff] [blame] | 834 | dev = gpd_data->base.dev; |
Rafael J. Wysocki | 6ff7bb0d0 | 2012-05-01 21:34:07 +0200 | [diff] [blame] | 835 | |
| 836 | for (;;) { |
Ulf Hansson | f38d1a6 | 2022-05-11 16:57:02 +0200 | [diff] [blame] | 837 | struct generic_pm_domain *genpd = ERR_PTR(-ENODATA); |
Rafael J. Wysocki | 6ff7bb0d0 | 2012-05-01 21:34:07 +0200 | [diff] [blame] | 838 | struct pm_domain_data *pdd; |
Ulf Hansson | 66d29d8 | 2022-05-11 16:56:56 +0200 | [diff] [blame] | 839 | struct gpd_timing_data *td; |
Rafael J. Wysocki | 6ff7bb0d0 | 2012-05-01 21:34:07 +0200 | [diff] [blame] | 840 | |
| 841 | spin_lock_irq(&dev->power.lock); |
| 842 | |
| 843 | pdd = dev->power.subsys_data ? |
| 844 | dev->power.subsys_data->domain_data : NULL; |
Viresh Kumar | b4883ca | 2017-05-16 10:52:43 +0530 | [diff] [blame] | 845 | if (pdd) { |
Ulf Hansson | 66d29d8 | 2022-05-11 16:56:56 +0200 | [diff] [blame] | 846 | td = to_gpd_data(pdd)->td; |
Ulf Hansson | f38d1a6 | 2022-05-11 16:57:02 +0200 | [diff] [blame] | 847 | if (td) { |
Ulf Hansson | 66d29d8 | 2022-05-11 16:56:56 +0200 | [diff] [blame] | 848 | td->constraint_changed = true; |
Ulf Hansson | f38d1a6 | 2022-05-11 16:57:02 +0200 | [diff] [blame] | 849 | genpd = dev_to_genpd(dev); |
| 850 | } |
Rafael J. Wysocki | 6ff7bb0d0 | 2012-05-01 21:34:07 +0200 | [diff] [blame] | 851 | } |
| 852 | |
| 853 | spin_unlock_irq(&dev->power.lock); |
| 854 | |
| 855 | if (!IS_ERR(genpd)) { |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 856 | genpd_lock(genpd); |
Ulf Hansson | f38d1a6 | 2022-05-11 16:57:02 +0200 | [diff] [blame] | 857 | genpd->gd->max_off_time_changed = true; |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 858 | genpd_unlock(genpd); |
Rafael J. Wysocki | 6ff7bb0d0 | 2012-05-01 21:34:07 +0200 | [diff] [blame] | 859 | } |
| 860 | |
| 861 | dev = dev->parent; |
| 862 | if (!dev || dev->power.ignore_children) |
| 863 | break; |
| 864 | } |
| 865 | |
| 866 | return NOTIFY_DONE; |
| 867 | } |
| 868 | |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 869 | /** |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 870 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. |
| 871 | * @work: Work structure used for scheduling the execution of this function. |
| 872 | */ |
| 873 | static void genpd_power_off_work_fn(struct work_struct *work) |
| 874 | { |
| 875 | struct generic_pm_domain *genpd; |
| 876 | |
| 877 | genpd = container_of(work, struct generic_pm_domain, power_off_work); |
| 878 | |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 879 | genpd_lock(genpd); |
Ulf Hansson | 2da8354 | 2017-02-17 10:55:25 +0100 | [diff] [blame] | 880 | genpd_power_off(genpd, false, 0); |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 881 | genpd_unlock(genpd); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 882 | } |
| 883 | |
| 884 | /** |
Ulf Hansson | 54eeddb | 2016-03-31 11:21:27 +0200 | [diff] [blame] | 885 | * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks |
| 886 | * @dev: Device to handle. |
| 887 | */ |
| 888 | static int __genpd_runtime_suspend(struct device *dev) |
| 889 | { |
| 890 | int (*cb)(struct device *__dev); |
| 891 | |
| 892 | if (dev->type && dev->type->pm) |
| 893 | cb = dev->type->pm->runtime_suspend; |
| 894 | else if (dev->class && dev->class->pm) |
| 895 | cb = dev->class->pm->runtime_suspend; |
| 896 | else if (dev->bus && dev->bus->pm) |
| 897 | cb = dev->bus->pm->runtime_suspend; |
| 898 | else |
| 899 | cb = NULL; |
| 900 | |
| 901 | if (!cb && dev->driver && dev->driver->pm) |
| 902 | cb = dev->driver->pm->runtime_suspend; |
| 903 | |
| 904 | return cb ? cb(dev) : 0; |
| 905 | } |
| 906 | |
| 907 | /** |
| 908 | * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks |
| 909 | * @dev: Device to handle. |
| 910 | */ |
| 911 | static int __genpd_runtime_resume(struct device *dev) |
| 912 | { |
| 913 | int (*cb)(struct device *__dev); |
| 914 | |
| 915 | if (dev->type && dev->type->pm) |
| 916 | cb = dev->type->pm->runtime_resume; |
| 917 | else if (dev->class && dev->class->pm) |
| 918 | cb = dev->class->pm->runtime_resume; |
| 919 | else if (dev->bus && dev->bus->pm) |
| 920 | cb = dev->bus->pm->runtime_resume; |
| 921 | else |
| 922 | cb = NULL; |
| 923 | |
| 924 | if (!cb && dev->driver && dev->driver->pm) |
| 925 | cb = dev->driver->pm->runtime_resume; |
| 926 | |
| 927 | return cb ? cb(dev) : 0; |
| 928 | } |
| 929 | |
| 930 | /** |
Ulf Hansson | 795bd2e | 2016-03-31 11:21:26 +0200 | [diff] [blame] | 931 | * genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 932 | * @dev: Device to suspend. |
| 933 | * |
| 934 | * Carry out a runtime suspend of a device under the assumption that its |
| 935 | * pm_domain field points to the domain member of an object of type |
| 936 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. |
| 937 | */ |
Ulf Hansson | 795bd2e | 2016-03-31 11:21:26 +0200 | [diff] [blame] | 938 | static int genpd_runtime_suspend(struct device *dev) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 939 | { |
| 940 | struct generic_pm_domain *genpd; |
Ulf Hansson | 9df3921 | 2016-03-31 11:21:25 +0200 | [diff] [blame] | 941 | bool (*suspend_ok)(struct device *__dev); |
Ulf Hansson | 5937c3c | 2021-06-03 11:34:37 +0200 | [diff] [blame] | 942 | struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev); |
Ulf Hansson | 66d29d8 | 2022-05-11 16:56:56 +0200 | [diff] [blame] | 943 | struct gpd_timing_data *td = gpd_data->td; |
Ulf Hansson | ffe1285 | 2015-11-30 16:21:38 +0100 | [diff] [blame] | 944 | bool runtime_pm = pm_runtime_enabled(dev); |
Ulf Hansson | 3b84bf3 | 2022-05-11 16:56:58 +0200 | [diff] [blame] | 945 | ktime_t time_start = 0; |
Ulf Hansson | 2b1d88c | 2015-10-15 17:02:19 +0200 | [diff] [blame] | 946 | s64 elapsed_ns; |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 947 | int ret; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 948 | |
| 949 | dev_dbg(dev, "%s()\n", __func__); |
| 950 | |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 951 | genpd = dev_to_genpd(dev); |
| 952 | if (IS_ERR(genpd)) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 953 | return -EINVAL; |
| 954 | |
Ulf Hansson | ffe1285 | 2015-11-30 16:21:38 +0100 | [diff] [blame] | 955 | /* |
| 956 | * A runtime PM centric subsystem/driver may re-use the runtime PM |
| 957 | * callbacks for other purposes than runtime PM. In those scenarios |
| 958 | * runtime PM is disabled. Under these circumstances, we shall skip |
| 959 | * validating/measuring the PM QoS latency. |
| 960 | */ |
Ulf Hansson | 9df3921 | 2016-03-31 11:21:25 +0200 | [diff] [blame] | 961 | suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL; |
| 962 | if (runtime_pm && suspend_ok && !suspend_ok(dev)) |
Rafael J. Wysocki | b02c999 | 2011-12-01 00:02:05 +0100 | [diff] [blame] | 963 | return -EBUSY; |
| 964 | |
Ulf Hansson | 2b1d88c | 2015-10-15 17:02:19 +0200 | [diff] [blame] | 965 | /* Measure suspend latency. */ |
Ulf Hansson | 3b84bf3 | 2022-05-11 16:56:58 +0200 | [diff] [blame] | 966 | if (td && runtime_pm) |
Ulf Hansson | ffe1285 | 2015-11-30 16:21:38 +0100 | [diff] [blame] | 967 | time_start = ktime_get(); |
Ulf Hansson | 2b1d88c | 2015-10-15 17:02:19 +0200 | [diff] [blame] | 968 | |
Ulf Hansson | 54eeddb | 2016-03-31 11:21:27 +0200 | [diff] [blame] | 969 | ret = __genpd_runtime_suspend(dev); |
Rafael J. Wysocki | d5e4cbf | 2011-11-27 13:11:36 +0100 | [diff] [blame] | 970 | if (ret) |
| 971 | return ret; |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 972 | |
Ulf Hansson | 2b1d88c | 2015-10-15 17:02:19 +0200 | [diff] [blame] | 973 | ret = genpd_stop_dev(genpd, dev); |
Ulf Hansson | ba2bbfb | 2015-06-18 15:17:53 +0200 | [diff] [blame] | 974 | if (ret) { |
Ulf Hansson | 54eeddb | 2016-03-31 11:21:27 +0200 | [diff] [blame] | 975 | __genpd_runtime_resume(dev); |
Ulf Hansson | ba2bbfb | 2015-06-18 15:17:53 +0200 | [diff] [blame] | 976 | return ret; |
| 977 | } |
| 978 | |
Ulf Hansson | 2b1d88c | 2015-10-15 17:02:19 +0200 | [diff] [blame] | 979 | /* Update suspend latency value if the measured time exceeds it. */ |
Ulf Hansson | 3b84bf3 | 2022-05-11 16:56:58 +0200 | [diff] [blame] | 980 | if (td && runtime_pm) { |
Ulf Hansson | ffe1285 | 2015-11-30 16:21:38 +0100 | [diff] [blame] | 981 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
Ulf Hansson | 3b84bf3 | 2022-05-11 16:56:58 +0200 | [diff] [blame] | 982 | if (elapsed_ns > td->suspend_latency_ns) { |
Ulf Hansson | ffe1285 | 2015-11-30 16:21:38 +0100 | [diff] [blame] | 983 | td->suspend_latency_ns = elapsed_ns; |
| 984 | dev_dbg(dev, "suspend latency exceeded, %lld ns\n", |
| 985 | elapsed_ns); |
Ulf Hansson | f38d1a6 | 2022-05-11 16:57:02 +0200 | [diff] [blame] | 986 | genpd->gd->max_off_time_changed = true; |
Ulf Hansson | ffe1285 | 2015-11-30 16:21:38 +0100 | [diff] [blame] | 987 | td->constraint_changed = true; |
| 988 | } |
Ulf Hansson | 2b1d88c | 2015-10-15 17:02:19 +0200 | [diff] [blame] | 989 | } |
| 990 | |
Rafael J. Wysocki | 0aa2a22 | 2011-08-25 15:37:04 +0200 | [diff] [blame] | 991 | /* |
Lina Iyer | d716f47 | 2016-10-14 10:47:55 -0700 | [diff] [blame] | 992 | * If power.irq_safe is set, this routine may be run with |
| 993 | * IRQs disabled, so suspend only if the PM domain also is irq_safe. |
Rafael J. Wysocki | 0aa2a22 | 2011-08-25 15:37:04 +0200 | [diff] [blame] | 994 | */ |
Ulf Hansson | 7a02444 | 2022-05-11 16:56:54 +0200 | [diff] [blame] | 995 | if (irq_safe_dev_in_sleep_domain(dev, genpd)) |
Rafael J. Wysocki | 0aa2a22 | 2011-08-25 15:37:04 +0200 | [diff] [blame] | 996 | return 0; |
| 997 | |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 998 | genpd_lock(genpd); |
Ulf Hansson | 2da8354 | 2017-02-17 10:55:25 +0100 | [diff] [blame] | 999 | genpd_power_off(genpd, true, 0); |
Abel Vesa | ae8ac19 | 2022-11-15 23:25:43 +0200 | [diff] [blame] | 1000 | gpd_data->rpm_pstate = genpd_drop_performance_state(dev); |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 1001 | genpd_unlock(genpd); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1002 | |
| 1003 | return 0; |
| 1004 | } |
| 1005 | |
| 1006 | /** |
Ulf Hansson | 795bd2e | 2016-03-31 11:21:26 +0200 | [diff] [blame] | 1007 | * genpd_runtime_resume - Resume a device belonging to I/O PM domain. |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1008 | * @dev: Device to resume. |
| 1009 | * |
| 1010 | * Carry out a runtime resume of a device under the assumption that its |
| 1011 | * pm_domain field points to the domain member of an object of type |
| 1012 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. |
| 1013 | */ |
Ulf Hansson | 795bd2e | 2016-03-31 11:21:26 +0200 | [diff] [blame] | 1014 | static int genpd_runtime_resume(struct device *dev) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1015 | { |
| 1016 | struct generic_pm_domain *genpd; |
Ulf Hansson | 5937c3c | 2021-06-03 11:34:37 +0200 | [diff] [blame] | 1017 | struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev); |
Ulf Hansson | 66d29d8 | 2022-05-11 16:56:56 +0200 | [diff] [blame] | 1018 | struct gpd_timing_data *td = gpd_data->td; |
Ulf Hansson | 3b84bf3 | 2022-05-11 16:56:58 +0200 | [diff] [blame] | 1019 | bool timed = td && pm_runtime_enabled(dev); |
| 1020 | ktime_t time_start = 0; |
Ulf Hansson | 2b1d88c | 2015-10-15 17:02:19 +0200 | [diff] [blame] | 1021 | s64 elapsed_ns; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1022 | int ret; |
| 1023 | |
| 1024 | dev_dbg(dev, "%s()\n", __func__); |
| 1025 | |
Rafael J. Wysocki | 5248051 | 2011-07-01 22:13:10 +0200 | [diff] [blame] | 1026 | genpd = dev_to_genpd(dev); |
| 1027 | if (IS_ERR(genpd)) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1028 | return -EINVAL; |
| 1029 | |
Lina Iyer | d716f47 | 2016-10-14 10:47:55 -0700 | [diff] [blame] | 1030 | /* |
| 1031 | * As we don't power off a non IRQ safe domain, which holds |
| 1032 | * an IRQ safe device, we don't need to restore power to it. |
| 1033 | */ |
Ulf Hansson | a294237 | 2022-05-11 16:56:59 +0200 | [diff] [blame] | 1034 | if (irq_safe_dev_in_sleep_domain(dev, genpd)) |
Ulf Hansson | ba2bbfb | 2015-06-18 15:17:53 +0200 | [diff] [blame] | 1035 | goto out; |
Rafael J. Wysocki | 0aa2a22 | 2011-08-25 15:37:04 +0200 | [diff] [blame] | 1036 | |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 1037 | genpd_lock(genpd); |
Abel Vesa | ae8ac19 | 2022-11-15 23:25:43 +0200 | [diff] [blame] | 1038 | genpd_restore_performance_state(dev, gpd_data->rpm_pstate); |
Ulf Hansson | 86e12ea | 2016-12-08 14:45:20 +0100 | [diff] [blame] | 1039 | ret = genpd_power_on(genpd, 0); |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 1040 | genpd_unlock(genpd); |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 1041 | |
Ulf Hansson | ba2bbfb | 2015-06-18 15:17:53 +0200 | [diff] [blame] | 1042 | if (ret) |
| 1043 | return ret; |
| 1044 | |
| 1045 | out: |
Ulf Hansson | 2b1d88c | 2015-10-15 17:02:19 +0200 | [diff] [blame] | 1046 | /* Measure resume latency. */ |
Ulf Hansson | 3b84bf3 | 2022-05-11 16:56:58 +0200 | [diff] [blame] | 1047 | if (timed) |
Ulf Hansson | 2b1d88c | 2015-10-15 17:02:19 +0200 | [diff] [blame] | 1048 | time_start = ktime_get(); |
| 1049 | |
Laurent Pinchart | 076395c | 2016-03-02 01:20:38 +0200 | [diff] [blame] | 1050 | ret = genpd_start_dev(genpd, dev); |
| 1051 | if (ret) |
| 1052 | goto err_poweroff; |
| 1053 | |
Ulf Hansson | 54eeddb | 2016-03-31 11:21:27 +0200 | [diff] [blame] | 1054 | ret = __genpd_runtime_resume(dev); |
Laurent Pinchart | 076395c | 2016-03-02 01:20:38 +0200 | [diff] [blame] | 1055 | if (ret) |
| 1056 | goto err_stop; |
Ulf Hansson | 2b1d88c | 2015-10-15 17:02:19 +0200 | [diff] [blame] | 1057 | |
| 1058 | /* Update resume latency value if the measured time exceeds it. */ |
Ulf Hansson | 3b84bf3 | 2022-05-11 16:56:58 +0200 | [diff] [blame] | 1059 | if (timed) { |
Ulf Hansson | 2b1d88c | 2015-10-15 17:02:19 +0200 | [diff] [blame] | 1060 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
Ulf Hansson | 3b84bf3 | 2022-05-11 16:56:58 +0200 | [diff] [blame] | 1061 | if (elapsed_ns > td->resume_latency_ns) { |
Ulf Hansson | 2b1d88c | 2015-10-15 17:02:19 +0200 | [diff] [blame] | 1062 | td->resume_latency_ns = elapsed_ns; |
| 1063 | dev_dbg(dev, "resume latency exceeded, %lld ns\n", |
| 1064 | elapsed_ns); |
Ulf Hansson | f38d1a6 | 2022-05-11 16:57:02 +0200 | [diff] [blame] | 1065 | genpd->gd->max_off_time_changed = true; |
Ulf Hansson | 2b1d88c | 2015-10-15 17:02:19 +0200 | [diff] [blame] | 1066 | td->constraint_changed = true; |
| 1067 | } |
| 1068 | } |
Ulf Hansson | ba2bbfb | 2015-06-18 15:17:53 +0200 | [diff] [blame] | 1069 | |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1070 | return 0; |
Laurent Pinchart | 076395c | 2016-03-02 01:20:38 +0200 | [diff] [blame] | 1071 | |
| 1072 | err_stop: |
| 1073 | genpd_stop_dev(genpd, dev); |
| 1074 | err_poweroff: |
Abaci Team | 6dc466d | 2021-01-27 16:42:05 +0800 | [diff] [blame] | 1075 | if (!pm_runtime_is_irq_safe(dev) || genpd_is_irq_safe(genpd)) { |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 1076 | genpd_lock(genpd); |
Ulf Hansson | 2da8354 | 2017-02-17 10:55:25 +0100 | [diff] [blame] | 1077 | genpd_power_off(genpd, true, 0); |
Abel Vesa | ae8ac19 | 2022-11-15 23:25:43 +0200 | [diff] [blame] | 1078 | gpd_data->rpm_pstate = genpd_drop_performance_state(dev); |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 1079 | genpd_unlock(genpd); |
Laurent Pinchart | 076395c | 2016-03-02 01:20:38 +0200 | [diff] [blame] | 1080 | } |
| 1081 | |
| 1082 | return ret; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1083 | } |
| 1084 | |
Tushar Behera | 39ac5ba | 2014-03-28 10:50:21 +0530 | [diff] [blame] | 1085 | static bool pd_ignore_unused; |
| 1086 | static int __init pd_ignore_unused_setup(char *__unused) |
| 1087 | { |
| 1088 | pd_ignore_unused = true; |
| 1089 | return 1; |
| 1090 | } |
| 1091 | __setup("pd_ignore_unused", pd_ignore_unused_setup); |
| 1092 | |
Rafael J. Wysocki | 17f2ae7 | 2011-08-14 13:34:31 +0200 | [diff] [blame] | 1093 | /** |
Ulf Hansson | 86e12ea | 2016-12-08 14:45:20 +0100 | [diff] [blame] | 1094 | * genpd_power_off_unused - Power off all PM domains with no devices in use. |
Rafael J. Wysocki | 17f2ae7 | 2011-08-14 13:34:31 +0200 | [diff] [blame] | 1095 | */ |
Ulf Hansson | 86e12ea | 2016-12-08 14:45:20 +0100 | [diff] [blame] | 1096 | static int __init genpd_power_off_unused(void) |
Rafael J. Wysocki | 17f2ae7 | 2011-08-14 13:34:31 +0200 | [diff] [blame] | 1097 | { |
| 1098 | struct generic_pm_domain *genpd; |
| 1099 | |
Tushar Behera | 39ac5ba | 2014-03-28 10:50:21 +0530 | [diff] [blame] | 1100 | if (pd_ignore_unused) { |
| 1101 | pr_warn("genpd: Not disabling unused power domains\n"); |
Ulf Hansson | bb4b72f | 2015-10-06 14:27:42 +0200 | [diff] [blame] | 1102 | return 0; |
Tushar Behera | 39ac5ba | 2014-03-28 10:50:21 +0530 | [diff] [blame] | 1103 | } |
| 1104 | |
Rafael J. Wysocki | 17f2ae7 | 2011-08-14 13:34:31 +0200 | [diff] [blame] | 1105 | mutex_lock(&gpd_list_lock); |
| 1106 | |
| 1107 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) |
| 1108 | genpd_queue_power_off_work(genpd); |
| 1109 | |
| 1110 | mutex_unlock(&gpd_list_lock); |
Rafael J. Wysocki | 17f2ae7 | 2011-08-14 13:34:31 +0200 | [diff] [blame] | 1111 | |
Ulf Hansson | 2fe71dc | 2014-09-03 12:52:26 +0200 | [diff] [blame] | 1112 | return 0; |
| 1113 | } |
Ulf Hansson | 86e12ea | 2016-12-08 14:45:20 +0100 | [diff] [blame] | 1114 | late_initcall(genpd_power_off_unused); |
Ulf Hansson | 2fe71dc | 2014-09-03 12:52:26 +0200 | [diff] [blame] | 1115 | |
Jon Hunter | 0159ec6 | 2016-09-12 12:01:10 +0100 | [diff] [blame] | 1116 | #ifdef CONFIG_PM_SLEEP |
| 1117 | |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1118 | /** |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 1119 | * genpd_sync_power_off - Synchronously power off a PM domain and its parents. |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1120 | * @genpd: PM domain to power off, if possible. |
Ulf Hansson | 0883ac0 | 2017-02-08 13:39:00 +0100 | [diff] [blame] | 1121 | * @use_lock: use the lock. |
| 1122 | * @depth: nesting count for lockdep. |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1123 | * |
| 1124 | * Check if the given PM domain can be powered off (during system suspend or |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 1125 | * hibernation) and do that if so. Also, in that case propagate to its parents. |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1126 | * |
Rafael J. Wysocki | 77f827d | 2012-08-06 01:39:57 +0200 | [diff] [blame] | 1127 | * This function is only called in "noirq" and "syscore" stages of system power |
Ulf Hansson | 0883ac0 | 2017-02-08 13:39:00 +0100 | [diff] [blame] | 1128 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
| 1129 | * these cases the lock must be held. |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1130 | */ |
Ulf Hansson | 0883ac0 | 2017-02-08 13:39:00 +0100 | [diff] [blame] | 1131 | static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock, |
| 1132 | unsigned int depth) |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1133 | { |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 1134 | struct gpd_link *link; |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1135 | |
Ulf Hansson | ffaa42e | 2017-03-20 11:19:21 +0100 | [diff] [blame] | 1136 | if (!genpd_status_on(genpd) || genpd_is_always_on(genpd)) |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1137 | return; |
| 1138 | |
Rafael J. Wysocki | c4bb316 | 2011-08-08 23:43:04 +0200 | [diff] [blame] | 1139 | if (genpd->suspended_count != genpd->device_count |
| 1140 | || atomic_read(&genpd->sd_count) > 0) |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1141 | return; |
| 1142 | |
Ulf Hansson | e7d90cf | 2022-02-17 13:49:50 +0100 | [diff] [blame] | 1143 | /* Check that the children are in their deepest (powered-off) state. */ |
| 1144 | list_for_each_entry(link, &genpd->parent_links, parent_node) { |
| 1145 | struct generic_pm_domain *child = link->child; |
| 1146 | if (child->state_idx < child->state_count - 1) |
| 1147 | return; |
| 1148 | } |
| 1149 | |
Axel Haslam | fc5cbf0 | 2016-02-15 11:10:51 +0100 | [diff] [blame] | 1150 | /* Choose the deepest state when suspending */ |
| 1151 | genpd->state_idx = genpd->state_count - 1; |
Ulf Hansson | 1c14967c | 2017-03-20 11:19:22 +0100 | [diff] [blame] | 1152 | if (_genpd_power_off(genpd, false)) |
| 1153 | return; |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1154 | |
Ulf Hansson | 49f618e | 2020-09-24 13:04:47 +0200 | [diff] [blame] | 1155 | genpd->status = GENPD_STATE_OFF; |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 1156 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 1157 | list_for_each_entry(link, &genpd->child_links, child_node) { |
| 1158 | genpd_sd_counter_dec(link->parent); |
Ulf Hansson | 0883ac0 | 2017-02-08 13:39:00 +0100 | [diff] [blame] | 1159 | |
| 1160 | if (use_lock) |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 1161 | genpd_lock_nested(link->parent, depth + 1); |
Ulf Hansson | 0883ac0 | 2017-02-08 13:39:00 +0100 | [diff] [blame] | 1162 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 1163 | genpd_sync_power_off(link->parent, use_lock, depth + 1); |
Ulf Hansson | 0883ac0 | 2017-02-08 13:39:00 +0100 | [diff] [blame] | 1164 | |
| 1165 | if (use_lock) |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 1166 | genpd_unlock(link->parent); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1167 | } |
| 1168 | } |
| 1169 | |
| 1170 | /** |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 1171 | * genpd_sync_power_on - Synchronously power on a PM domain and its parents. |
Rafael J. Wysocki | 802d8b4 | 2012-08-06 01:39:16 +0200 | [diff] [blame] | 1172 | * @genpd: PM domain to power on. |
Ulf Hansson | 0883ac0 | 2017-02-08 13:39:00 +0100 | [diff] [blame] | 1173 | * @use_lock: use the lock. |
| 1174 | * @depth: nesting count for lockdep. |
Rafael J. Wysocki | 802d8b4 | 2012-08-06 01:39:16 +0200 | [diff] [blame] | 1175 | * |
Rafael J. Wysocki | 77f827d | 2012-08-06 01:39:57 +0200 | [diff] [blame] | 1176 | * This function is only called in "noirq" and "syscore" stages of system power |
Ulf Hansson | 0883ac0 | 2017-02-08 13:39:00 +0100 | [diff] [blame] | 1177 | * transitions. The "noirq" callbacks may be executed asynchronously, thus in |
| 1178 | * these cases the lock must be held. |
Rafael J. Wysocki | 802d8b4 | 2012-08-06 01:39:16 +0200 | [diff] [blame] | 1179 | */ |
Ulf Hansson | 0883ac0 | 2017-02-08 13:39:00 +0100 | [diff] [blame] | 1180 | static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock, |
| 1181 | unsigned int depth) |
Rafael J. Wysocki | 802d8b4 | 2012-08-06 01:39:16 +0200 | [diff] [blame] | 1182 | { |
| 1183 | struct gpd_link *link; |
| 1184 | |
Ulf Hansson | 41e2c8e | 2017-03-20 11:19:20 +0100 | [diff] [blame] | 1185 | if (genpd_status_on(genpd)) |
Rafael J. Wysocki | 802d8b4 | 2012-08-06 01:39:16 +0200 | [diff] [blame] | 1186 | return; |
| 1187 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 1188 | list_for_each_entry(link, &genpd->child_links, child_node) { |
| 1189 | genpd_sd_counter_inc(link->parent); |
Ulf Hansson | 0883ac0 | 2017-02-08 13:39:00 +0100 | [diff] [blame] | 1190 | |
| 1191 | if (use_lock) |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 1192 | genpd_lock_nested(link->parent, depth + 1); |
Ulf Hansson | 0883ac0 | 2017-02-08 13:39:00 +0100 | [diff] [blame] | 1193 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 1194 | genpd_sync_power_on(link->parent, use_lock, depth + 1); |
Ulf Hansson | 0883ac0 | 2017-02-08 13:39:00 +0100 | [diff] [blame] | 1195 | |
| 1196 | if (use_lock) |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 1197 | genpd_unlock(link->parent); |
Rafael J. Wysocki | 802d8b4 | 2012-08-06 01:39:16 +0200 | [diff] [blame] | 1198 | } |
| 1199 | |
Ulf Hansson | 86e12ea | 2016-12-08 14:45:20 +0100 | [diff] [blame] | 1200 | _genpd_power_on(genpd, false); |
Ulf Hansson | 49f618e | 2020-09-24 13:04:47 +0200 | [diff] [blame] | 1201 | genpd->status = GENPD_STATE_ON; |
Rafael J. Wysocki | 802d8b4 | 2012-08-06 01:39:16 +0200 | [diff] [blame] | 1202 | } |
| 1203 | |
| 1204 | /** |
Ulf Hansson | 9e9704e | 2017-10-06 09:02:06 +0200 | [diff] [blame] | 1205 | * genpd_prepare - Start power transition of a device in a PM domain. |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1206 | * @dev: Device to start the transition of. |
| 1207 | * |
| 1208 | * Start a power transition of a device (during a system-wide power transition) |
| 1209 | * under the assumption that its pm_domain field points to the domain member of |
| 1210 | * an object of type struct generic_pm_domain representing a PM domain |
| 1211 | * consisting of I/O devices. |
| 1212 | */ |
Ulf Hansson | 9e9704e | 2017-10-06 09:02:06 +0200 | [diff] [blame] | 1213 | static int genpd_prepare(struct device *dev) |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1214 | { |
| 1215 | struct generic_pm_domain *genpd; |
Rafael J. Wysocki | b6c10c8 | 2011-07-12 00:39:21 +0200 | [diff] [blame] | 1216 | int ret; |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1217 | |
| 1218 | dev_dbg(dev, "%s()\n", __func__); |
| 1219 | |
| 1220 | genpd = dev_to_genpd(dev); |
| 1221 | if (IS_ERR(genpd)) |
| 1222 | return -EINVAL; |
| 1223 | |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 1224 | genpd_lock(genpd); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1225 | |
Ulf Hansson | 39dd0f2 | 2016-05-30 11:43:07 +0200 | [diff] [blame] | 1226 | if (genpd->prepared_count++ == 0) |
Rafael J. Wysocki | 65533bb | 2012-03-13 22:39:37 +0100 | [diff] [blame] | 1227 | genpd->suspended_count = 0; |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 1228 | |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 1229 | genpd_unlock(genpd); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1230 | |
Rafael J. Wysocki | b6c10c8 | 2011-07-12 00:39:21 +0200 | [diff] [blame] | 1231 | ret = pm_generic_prepare(dev); |
Ulf Hansson | 5241ab40 | 2017-11-08 10:11:02 +0100 | [diff] [blame] | 1232 | if (ret < 0) { |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 1233 | genpd_lock(genpd); |
Rafael J. Wysocki | b6c10c8 | 2011-07-12 00:39:21 +0200 | [diff] [blame] | 1234 | |
Ulf Hansson | 39dd0f2 | 2016-05-30 11:43:07 +0200 | [diff] [blame] | 1235 | genpd->prepared_count--; |
Rafael J. Wysocki | b6c10c8 | 2011-07-12 00:39:21 +0200 | [diff] [blame] | 1236 | |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 1237 | genpd_unlock(genpd); |
Rafael J. Wysocki | b6c10c8 | 2011-07-12 00:39:21 +0200 | [diff] [blame] | 1238 | } |
Rafael J. Wysocki | 17b75ec | 2011-07-12 00:39:29 +0200 | [diff] [blame] | 1239 | |
Ulf Hansson | 5241ab40 | 2017-11-08 10:11:02 +0100 | [diff] [blame] | 1240 | /* Never return 1, as genpd don't cope with the direct_complete path. */ |
| 1241 | return ret >= 0 ? 0 : ret; |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1242 | } |
| 1243 | |
| 1244 | /** |
Mikko Perttunen | 10da654 | 2017-06-22 10:18:33 +0300 | [diff] [blame] | 1245 | * genpd_finish_suspend - Completion of suspend or hibernation of device in an |
| 1246 | * I/O pm domain. |
Rafael J. Wysocki | 0496c8a | 2012-01-29 20:39:02 +0100 | [diff] [blame] | 1247 | * @dev: Device to suspend. |
Shawn Guo | 615db6d | 2022-11-02 22:21:02 +0800 | [diff] [blame] | 1248 | * @suspend_noirq: Generic suspend_noirq callback. |
| 1249 | * @resume_noirq: Generic resume_noirq callback. |
Rafael J. Wysocki | 0496c8a | 2012-01-29 20:39:02 +0100 | [diff] [blame] | 1250 | * |
| 1251 | * Stop the device and remove power from the domain if all devices in it have |
| 1252 | * been stopped. |
| 1253 | */ |
Shawn Guo | 615db6d | 2022-11-02 22:21:02 +0800 | [diff] [blame] | 1254 | static int genpd_finish_suspend(struct device *dev, |
| 1255 | int (*suspend_noirq)(struct device *dev), |
| 1256 | int (*resume_noirq)(struct device *dev)) |
Rafael J. Wysocki | 0496c8a | 2012-01-29 20:39:02 +0100 | [diff] [blame] | 1257 | { |
| 1258 | struct generic_pm_domain *genpd; |
Ulf Hansson | a935424 | 2018-01-10 21:31:56 +0100 | [diff] [blame] | 1259 | int ret = 0; |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1260 | |
Rafael J. Wysocki | 0496c8a | 2012-01-29 20:39:02 +0100 | [diff] [blame] | 1261 | genpd = dev_to_genpd(dev); |
| 1262 | if (IS_ERR(genpd)) |
| 1263 | return -EINVAL; |
| 1264 | |
Shawn Guo | 615db6d | 2022-11-02 22:21:02 +0800 | [diff] [blame] | 1265 | ret = suspend_noirq(dev); |
Mikko Perttunen | 10da654 | 2017-06-22 10:18:33 +0300 | [diff] [blame] | 1266 | if (ret) |
| 1267 | return ret; |
| 1268 | |
Patrice Chotard | 4e1d9a7 | 2020-11-19 08:25:39 +0100 | [diff] [blame] | 1269 | if (device_wakeup_path(dev) && genpd_is_active_wakeup(genpd)) |
Ulf Hansson | a935424 | 2018-01-10 21:31:56 +0100 | [diff] [blame] | 1270 | return 0; |
| 1271 | |
Rafael J. Wysocki | 17218e0 | 2018-01-12 14:10:38 +0100 | [diff] [blame] | 1272 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
| 1273 | !pm_runtime_status_suspended(dev)) { |
| 1274 | ret = genpd_stop_dev(genpd, dev); |
Ulf Hansson | a935424 | 2018-01-10 21:31:56 +0100 | [diff] [blame] | 1275 | if (ret) { |
Shawn Guo | 615db6d | 2022-11-02 22:21:02 +0800 | [diff] [blame] | 1276 | resume_noirq(dev); |
Ulf Hansson | 122a223 | 2016-05-30 11:33:14 +0200 | [diff] [blame] | 1277 | return ret; |
Ulf Hansson | a935424 | 2018-01-10 21:31:56 +0100 | [diff] [blame] | 1278 | } |
Ulf Hansson | 122a223 | 2016-05-30 11:33:14 +0200 | [diff] [blame] | 1279 | } |
| 1280 | |
Ulf Hansson | 0883ac0 | 2017-02-08 13:39:00 +0100 | [diff] [blame] | 1281 | genpd_lock(genpd); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1282 | genpd->suspended_count++; |
Ulf Hansson | 0883ac0 | 2017-02-08 13:39:00 +0100 | [diff] [blame] | 1283 | genpd_sync_power_off(genpd, true, 0); |
| 1284 | genpd_unlock(genpd); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1285 | |
| 1286 | return 0; |
| 1287 | } |
| 1288 | |
| 1289 | /** |
Ulf Hansson | 9e9704e | 2017-10-06 09:02:06 +0200 | [diff] [blame] | 1290 | * genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. |
Mikko Perttunen | 10da654 | 2017-06-22 10:18:33 +0300 | [diff] [blame] | 1291 | * @dev: Device to suspend. |
| 1292 | * |
| 1293 | * Stop the device and remove power from the domain if all devices in it have |
| 1294 | * been stopped. |
| 1295 | */ |
Ulf Hansson | 9e9704e | 2017-10-06 09:02:06 +0200 | [diff] [blame] | 1296 | static int genpd_suspend_noirq(struct device *dev) |
Mikko Perttunen | 10da654 | 2017-06-22 10:18:33 +0300 | [diff] [blame] | 1297 | { |
| 1298 | dev_dbg(dev, "%s()\n", __func__); |
| 1299 | |
Shawn Guo | 615db6d | 2022-11-02 22:21:02 +0800 | [diff] [blame] | 1300 | return genpd_finish_suspend(dev, |
| 1301 | pm_generic_suspend_noirq, |
| 1302 | pm_generic_resume_noirq); |
Mikko Perttunen | 10da654 | 2017-06-22 10:18:33 +0300 | [diff] [blame] | 1303 | } |
| 1304 | |
| 1305 | /** |
Shawn Guo | d9cc34f | 2022-11-02 22:21:03 +0800 | [diff] [blame] | 1306 | * genpd_finish_resume - Completion of resume of device in an I/O PM domain. |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1307 | * @dev: Device to resume. |
Shawn Guo | d9cc34f | 2022-11-02 22:21:03 +0800 | [diff] [blame] | 1308 | * @resume_noirq: Generic resume_noirq callback. |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1309 | * |
Rafael J. Wysocki | 0496c8a | 2012-01-29 20:39:02 +0100 | [diff] [blame] | 1310 | * Restore power to the device's PM domain, if necessary, and start the device. |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1311 | */ |
Shawn Guo | d9cc34f | 2022-11-02 22:21:03 +0800 | [diff] [blame] | 1312 | static int genpd_finish_resume(struct device *dev, |
| 1313 | int (*resume_noirq)(struct device *dev)) |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1314 | { |
| 1315 | struct generic_pm_domain *genpd; |
Ulf Hansson | a935424 | 2018-01-10 21:31:56 +0100 | [diff] [blame] | 1316 | int ret; |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1317 | |
| 1318 | dev_dbg(dev, "%s()\n", __func__); |
| 1319 | |
| 1320 | genpd = dev_to_genpd(dev); |
| 1321 | if (IS_ERR(genpd)) |
| 1322 | return -EINVAL; |
| 1323 | |
Patrice Chotard | 4e1d9a7 | 2020-11-19 08:25:39 +0100 | [diff] [blame] | 1324 | if (device_wakeup_path(dev) && genpd_is_active_wakeup(genpd)) |
Shawn Guo | d9cc34f | 2022-11-02 22:21:03 +0800 | [diff] [blame] | 1325 | return resume_noirq(dev); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1326 | |
Ulf Hansson | 0883ac0 | 2017-02-08 13:39:00 +0100 | [diff] [blame] | 1327 | genpd_lock(genpd); |
| 1328 | genpd_sync_power_on(genpd, true, 0); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1329 | genpd->suspended_count--; |
Ulf Hansson | 0883ac0 | 2017-02-08 13:39:00 +0100 | [diff] [blame] | 1330 | genpd_unlock(genpd); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1331 | |
Rafael J. Wysocki | 17218e0 | 2018-01-12 14:10:38 +0100 | [diff] [blame] | 1332 | if (genpd->dev_ops.stop && genpd->dev_ops.start && |
| 1333 | !pm_runtime_status_suspended(dev)) { |
| 1334 | ret = genpd_start_dev(genpd, dev); |
Ulf Hansson | a935424 | 2018-01-10 21:31:56 +0100 | [diff] [blame] | 1335 | if (ret) |
| 1336 | return ret; |
| 1337 | } |
Ulf Hansson | 122a223 | 2016-05-30 11:33:14 +0200 | [diff] [blame] | 1338 | |
Ulf Hansson | a935424 | 2018-01-10 21:31:56 +0100 | [diff] [blame] | 1339 | return pm_generic_resume_noirq(dev); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1340 | } |
| 1341 | |
| 1342 | /** |
Shawn Guo | d9cc34f | 2022-11-02 22:21:03 +0800 | [diff] [blame] | 1343 | * genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
| 1344 | * @dev: Device to resume. |
| 1345 | * |
| 1346 | * Restore power to the device's PM domain, if necessary, and start the device. |
| 1347 | */ |
| 1348 | static int genpd_resume_noirq(struct device *dev) |
| 1349 | { |
| 1350 | dev_dbg(dev, "%s()\n", __func__); |
| 1351 | |
| 1352 | return genpd_finish_resume(dev, pm_generic_resume_noirq); |
| 1353 | } |
| 1354 | |
| 1355 | /** |
Ulf Hansson | 9e9704e | 2017-10-06 09:02:06 +0200 | [diff] [blame] | 1356 | * genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1357 | * @dev: Device to freeze. |
| 1358 | * |
| 1359 | * Carry out a late freeze of a device under the assumption that its |
| 1360 | * pm_domain field points to the domain member of an object of type |
| 1361 | * struct generic_pm_domain representing a power domain consisting of I/O |
| 1362 | * devices. |
| 1363 | */ |
Ulf Hansson | 9e9704e | 2017-10-06 09:02:06 +0200 | [diff] [blame] | 1364 | static int genpd_freeze_noirq(struct device *dev) |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1365 | { |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1366 | dev_dbg(dev, "%s()\n", __func__); |
| 1367 | |
Shawn Guo | ebb486b | 2022-11-02 22:21:04 +0800 | [diff] [blame] | 1368 | return genpd_finish_suspend(dev, |
| 1369 | pm_generic_freeze_noirq, |
| 1370 | pm_generic_thaw_noirq); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1371 | } |
| 1372 | |
| 1373 | /** |
Ulf Hansson | 9e9704e | 2017-10-06 09:02:06 +0200 | [diff] [blame] | 1374 | * genpd_thaw_noirq - Early thaw of device in an I/O PM domain. |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1375 | * @dev: Device to thaw. |
| 1376 | * |
Rafael J. Wysocki | 0496c8a | 2012-01-29 20:39:02 +0100 | [diff] [blame] | 1377 | * Start the device, unless power has been removed from the domain already |
| 1378 | * before the system transition. |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1379 | */ |
Ulf Hansson | 9e9704e | 2017-10-06 09:02:06 +0200 | [diff] [blame] | 1380 | static int genpd_thaw_noirq(struct device *dev) |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1381 | { |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1382 | dev_dbg(dev, "%s()\n", __func__); |
| 1383 | |
Shawn Guo | ebb486b | 2022-11-02 22:21:04 +0800 | [diff] [blame] | 1384 | return genpd_finish_resume(dev, pm_generic_thaw_noirq); |
Mikko Perttunen | 10da654 | 2017-06-22 10:18:33 +0300 | [diff] [blame] | 1385 | } |
| 1386 | |
| 1387 | /** |
Ulf Hansson | 9e9704e | 2017-10-06 09:02:06 +0200 | [diff] [blame] | 1388 | * genpd_poweroff_noirq - Completion of hibernation of device in an |
Mikko Perttunen | 10da654 | 2017-06-22 10:18:33 +0300 | [diff] [blame] | 1389 | * I/O PM domain. |
| 1390 | * @dev: Device to poweroff. |
| 1391 | * |
| 1392 | * Stop the device and remove power from the domain if all devices in it have |
| 1393 | * been stopped. |
| 1394 | */ |
Ulf Hansson | 9e9704e | 2017-10-06 09:02:06 +0200 | [diff] [blame] | 1395 | static int genpd_poweroff_noirq(struct device *dev) |
Mikko Perttunen | 10da654 | 2017-06-22 10:18:33 +0300 | [diff] [blame] | 1396 | { |
| 1397 | dev_dbg(dev, "%s()\n", __func__); |
| 1398 | |
Shawn Guo | 615db6d | 2022-11-02 22:21:02 +0800 | [diff] [blame] | 1399 | return genpd_finish_suspend(dev, |
| 1400 | pm_generic_poweroff_noirq, |
| 1401 | pm_generic_restore_noirq); |
Rafael J. Wysocki | 0496c8a | 2012-01-29 20:39:02 +0100 | [diff] [blame] | 1402 | } |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1403 | |
Rafael J. Wysocki | 0496c8a | 2012-01-29 20:39:02 +0100 | [diff] [blame] | 1404 | /** |
Ulf Hansson | 9e9704e | 2017-10-06 09:02:06 +0200 | [diff] [blame] | 1405 | * genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1406 | * @dev: Device to resume. |
| 1407 | * |
Rafael J. Wysocki | 0496c8a | 2012-01-29 20:39:02 +0100 | [diff] [blame] | 1408 | * Make sure the domain will be in the same power state as before the |
| 1409 | * hibernation the system is resuming from and start the device if necessary. |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1410 | */ |
Ulf Hansson | 9e9704e | 2017-10-06 09:02:06 +0200 | [diff] [blame] | 1411 | static int genpd_restore_noirq(struct device *dev) |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1412 | { |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1413 | dev_dbg(dev, "%s()\n", __func__); |
| 1414 | |
Shawn Guo | d9cc34f | 2022-11-02 22:21:03 +0800 | [diff] [blame] | 1415 | return genpd_finish_resume(dev, pm_generic_restore_noirq); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1416 | } |
| 1417 | |
| 1418 | /** |
Ulf Hansson | 9e9704e | 2017-10-06 09:02:06 +0200 | [diff] [blame] | 1419 | * genpd_complete - Complete power transition of a device in a power domain. |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1420 | * @dev: Device to complete the transition of. |
| 1421 | * |
| 1422 | * Complete a power transition of a device (during a system-wide power |
| 1423 | * transition) under the assumption that its pm_domain field points to the |
| 1424 | * domain member of an object of type struct generic_pm_domain representing |
| 1425 | * a power domain consisting of I/O devices. |
| 1426 | */ |
Ulf Hansson | 9e9704e | 2017-10-06 09:02:06 +0200 | [diff] [blame] | 1427 | static void genpd_complete(struct device *dev) |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1428 | { |
| 1429 | struct generic_pm_domain *genpd; |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1430 | |
| 1431 | dev_dbg(dev, "%s()\n", __func__); |
| 1432 | |
| 1433 | genpd = dev_to_genpd(dev); |
| 1434 | if (IS_ERR(genpd)) |
| 1435 | return; |
| 1436 | |
Ulf Hansson | 4d23a5e | 2016-05-30 11:33:13 +0200 | [diff] [blame] | 1437 | pm_generic_complete(dev); |
| 1438 | |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 1439 | genpd_lock(genpd); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1440 | |
Ulf Hansson | 39dd0f2 | 2016-05-30 11:43:07 +0200 | [diff] [blame] | 1441 | genpd->prepared_count--; |
Ulf Hansson | 4d23a5e | 2016-05-30 11:33:13 +0200 | [diff] [blame] | 1442 | if (!genpd->prepared_count) |
| 1443 | genpd_queue_power_off_work(genpd); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1444 | |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 1445 | genpd_unlock(genpd); |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1446 | } |
| 1447 | |
Ulf Hansson | fc51989 | 2020-11-03 16:06:25 +0100 | [diff] [blame] | 1448 | static void genpd_switch_state(struct device *dev, bool suspend) |
Rafael J. Wysocki | 77f827d | 2012-08-06 01:39:57 +0200 | [diff] [blame] | 1449 | { |
| 1450 | struct generic_pm_domain *genpd; |
Ulf Hansson | b9795a3 | 2020-11-03 16:06:26 +0100 | [diff] [blame] | 1451 | bool use_lock; |
Rafael J. Wysocki | 77f827d | 2012-08-06 01:39:57 +0200 | [diff] [blame] | 1452 | |
Ulf Hansson | fe0c2baa | 2019-10-16 16:16:49 +0200 | [diff] [blame] | 1453 | genpd = dev_to_genpd_safe(dev); |
| 1454 | if (!genpd) |
Rafael J. Wysocki | 77f827d | 2012-08-06 01:39:57 +0200 | [diff] [blame] | 1455 | return; |
| 1456 | |
Ulf Hansson | b9795a3 | 2020-11-03 16:06:26 +0100 | [diff] [blame] | 1457 | use_lock = genpd_is_irq_safe(genpd); |
| 1458 | |
| 1459 | if (use_lock) |
| 1460 | genpd_lock(genpd); |
| 1461 | |
Rafael J. Wysocki | 77f827d | 2012-08-06 01:39:57 +0200 | [diff] [blame] | 1462 | if (suspend) { |
| 1463 | genpd->suspended_count++; |
Ulf Hansson | b9795a3 | 2020-11-03 16:06:26 +0100 | [diff] [blame] | 1464 | genpd_sync_power_off(genpd, use_lock, 0); |
Rafael J. Wysocki | 77f827d | 2012-08-06 01:39:57 +0200 | [diff] [blame] | 1465 | } else { |
Ulf Hansson | b9795a3 | 2020-11-03 16:06:26 +0100 | [diff] [blame] | 1466 | genpd_sync_power_on(genpd, use_lock, 0); |
Rafael J. Wysocki | 77f827d | 2012-08-06 01:39:57 +0200 | [diff] [blame] | 1467 | genpd->suspended_count--; |
| 1468 | } |
Ulf Hansson | b9795a3 | 2020-11-03 16:06:26 +0100 | [diff] [blame] | 1469 | |
| 1470 | if (use_lock) |
| 1471 | genpd_unlock(genpd); |
Rafael J. Wysocki | 77f827d | 2012-08-06 01:39:57 +0200 | [diff] [blame] | 1472 | } |
Ulf Hansson | d47e646 | 2014-09-03 12:52:24 +0200 | [diff] [blame] | 1473 | |
Ulf Hansson | fc51989 | 2020-11-03 16:06:25 +0100 | [diff] [blame] | 1474 | /** |
| 1475 | * dev_pm_genpd_suspend - Synchronously try to suspend the genpd for @dev |
| 1476 | * @dev: The device that is attached to the genpd, that can be suspended. |
| 1477 | * |
| 1478 | * This routine should typically be called for a device that needs to be |
Ulf Hansson | b9795a3 | 2020-11-03 16:06:26 +0100 | [diff] [blame] | 1479 | * suspended during the syscore suspend phase. It may also be called during |
| 1480 | * suspend-to-idle to suspend a corresponding CPU device that is attached to a |
| 1481 | * genpd. |
Ulf Hansson | fc51989 | 2020-11-03 16:06:25 +0100 | [diff] [blame] | 1482 | */ |
| 1483 | void dev_pm_genpd_suspend(struct device *dev) |
Ulf Hansson | d47e646 | 2014-09-03 12:52:24 +0200 | [diff] [blame] | 1484 | { |
Ulf Hansson | fc51989 | 2020-11-03 16:06:25 +0100 | [diff] [blame] | 1485 | genpd_switch_state(dev, true); |
Ulf Hansson | d47e646 | 2014-09-03 12:52:24 +0200 | [diff] [blame] | 1486 | } |
Ulf Hansson | fc51989 | 2020-11-03 16:06:25 +0100 | [diff] [blame] | 1487 | EXPORT_SYMBOL_GPL(dev_pm_genpd_suspend); |
Ulf Hansson | d47e646 | 2014-09-03 12:52:24 +0200 | [diff] [blame] | 1488 | |
Ulf Hansson | fc51989 | 2020-11-03 16:06:25 +0100 | [diff] [blame] | 1489 | /** |
| 1490 | * dev_pm_genpd_resume - Synchronously try to resume the genpd for @dev |
| 1491 | * @dev: The device that is attached to the genpd, which needs to be resumed. |
| 1492 | * |
| 1493 | * This routine should typically be called for a device that needs to be resumed |
Ulf Hansson | b9795a3 | 2020-11-03 16:06:26 +0100 | [diff] [blame] | 1494 | * during the syscore resume phase. It may also be called during suspend-to-idle |
| 1495 | * to resume a corresponding CPU device that is attached to a genpd. |
Ulf Hansson | fc51989 | 2020-11-03 16:06:25 +0100 | [diff] [blame] | 1496 | */ |
| 1497 | void dev_pm_genpd_resume(struct device *dev) |
Ulf Hansson | d47e646 | 2014-09-03 12:52:24 +0200 | [diff] [blame] | 1498 | { |
Ulf Hansson | fc51989 | 2020-11-03 16:06:25 +0100 | [diff] [blame] | 1499 | genpd_switch_state(dev, false); |
Ulf Hansson | d47e646 | 2014-09-03 12:52:24 +0200 | [diff] [blame] | 1500 | } |
Ulf Hansson | fc51989 | 2020-11-03 16:06:25 +0100 | [diff] [blame] | 1501 | EXPORT_SYMBOL_GPL(dev_pm_genpd_resume); |
Rafael J. Wysocki | 77f827d | 2012-08-06 01:39:57 +0200 | [diff] [blame] | 1502 | |
Rafael J. Wysocki | d30d819 | 2014-11-27 22:38:05 +0100 | [diff] [blame] | 1503 | #else /* !CONFIG_PM_SLEEP */ |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1504 | |
Ulf Hansson | 9e9704e | 2017-10-06 09:02:06 +0200 | [diff] [blame] | 1505 | #define genpd_prepare NULL |
| 1506 | #define genpd_suspend_noirq NULL |
| 1507 | #define genpd_resume_noirq NULL |
| 1508 | #define genpd_freeze_noirq NULL |
| 1509 | #define genpd_thaw_noirq NULL |
| 1510 | #define genpd_poweroff_noirq NULL |
| 1511 | #define genpd_restore_noirq NULL |
| 1512 | #define genpd_complete NULL |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1513 | |
| 1514 | #endif /* CONFIG_PM_SLEEP */ |
| 1515 | |
Ulf Hansson | 66d29d8 | 2022-05-11 16:56:56 +0200 | [diff] [blame] | 1516 | static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, |
| 1517 | bool has_governor) |
Rafael J. Wysocki | 1d5fcfe | 2012-07-05 22:12:32 +0200 | [diff] [blame] | 1518 | { |
| 1519 | struct generic_pm_domain_data *gpd_data; |
Ulf Hansson | 66d29d8 | 2022-05-11 16:56:56 +0200 | [diff] [blame] | 1520 | struct gpd_timing_data *td; |
Ulf Hansson | 3e23568 | 2015-01-27 21:13:43 +0100 | [diff] [blame] | 1521 | int ret; |
| 1522 | |
| 1523 | ret = dev_pm_get_subsys_data(dev); |
| 1524 | if (ret) |
| 1525 | return ERR_PTR(ret); |
Rafael J. Wysocki | 1d5fcfe | 2012-07-05 22:12:32 +0200 | [diff] [blame] | 1526 | |
| 1527 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); |
Ulf Hansson | 3e23568 | 2015-01-27 21:13:43 +0100 | [diff] [blame] | 1528 | if (!gpd_data) { |
| 1529 | ret = -ENOMEM; |
| 1530 | goto err_put; |
| 1531 | } |
Rafael J. Wysocki | 1d5fcfe | 2012-07-05 22:12:32 +0200 | [diff] [blame] | 1532 | |
Ulf Hansson | f104e1e5 | 2015-01-27 21:13:44 +0100 | [diff] [blame] | 1533 | gpd_data->base.dev = dev; |
Ulf Hansson | f104e1e5 | 2015-01-27 21:13:44 +0100 | [diff] [blame] | 1534 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; |
| 1535 | |
Ulf Hansson | 66d29d8 | 2022-05-11 16:56:56 +0200 | [diff] [blame] | 1536 | /* Allocate data used by a governor. */ |
| 1537 | if (has_governor) { |
| 1538 | td = kzalloc(sizeof(*td), GFP_KERNEL); |
| 1539 | if (!td) { |
| 1540 | ret = -ENOMEM; |
| 1541 | goto err_free; |
| 1542 | } |
Ulf Hansson | f104e1e5 | 2015-01-27 21:13:44 +0100 | [diff] [blame] | 1543 | |
Ulf Hansson | 66d29d8 | 2022-05-11 16:56:56 +0200 | [diff] [blame] | 1544 | td->constraint_changed = true; |
| 1545 | td->effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; |
Ulf Hansson | 9c74f2a | 2022-05-11 16:56:57 +0200 | [diff] [blame] | 1546 | td->next_wakeup = KTIME_MAX; |
Ulf Hansson | 66d29d8 | 2022-05-11 16:56:56 +0200 | [diff] [blame] | 1547 | gpd_data->td = td; |
Ulf Hansson | f104e1e5 | 2015-01-27 21:13:44 +0100 | [diff] [blame] | 1548 | } |
| 1549 | |
Ulf Hansson | 66d29d8 | 2022-05-11 16:56:56 +0200 | [diff] [blame] | 1550 | spin_lock_irq(&dev->power.lock); |
| 1551 | |
| 1552 | if (dev->power.subsys_data->domain_data) |
| 1553 | ret = -EINVAL; |
| 1554 | else |
| 1555 | dev->power.subsys_data->domain_data = &gpd_data->base; |
Ulf Hansson | f104e1e5 | 2015-01-27 21:13:44 +0100 | [diff] [blame] | 1556 | |
| 1557 | spin_unlock_irq(&dev->power.lock); |
| 1558 | |
Ulf Hansson | 66d29d8 | 2022-05-11 16:56:56 +0200 | [diff] [blame] | 1559 | if (ret) |
| 1560 | goto err_free; |
| 1561 | |
Rafael J. Wysocki | 1d5fcfe | 2012-07-05 22:12:32 +0200 | [diff] [blame] | 1562 | return gpd_data; |
Ulf Hansson | 3e23568 | 2015-01-27 21:13:43 +0100 | [diff] [blame] | 1563 | |
Ulf Hansson | f104e1e5 | 2015-01-27 21:13:44 +0100 | [diff] [blame] | 1564 | err_free: |
Ulf Hansson | 66d29d8 | 2022-05-11 16:56:56 +0200 | [diff] [blame] | 1565 | kfree(gpd_data->td); |
Ulf Hansson | f104e1e5 | 2015-01-27 21:13:44 +0100 | [diff] [blame] | 1566 | kfree(gpd_data); |
Ulf Hansson | 3e23568 | 2015-01-27 21:13:43 +0100 | [diff] [blame] | 1567 | err_put: |
| 1568 | dev_pm_put_subsys_data(dev); |
| 1569 | return ERR_PTR(ret); |
Rafael J. Wysocki | 1d5fcfe | 2012-07-05 22:12:32 +0200 | [diff] [blame] | 1570 | } |
| 1571 | |
Ulf Hansson | 49d400c | 2015-01-27 21:13:38 +0100 | [diff] [blame] | 1572 | static void genpd_free_dev_data(struct device *dev, |
| 1573 | struct generic_pm_domain_data *gpd_data) |
Rafael J. Wysocki | 1d5fcfe | 2012-07-05 22:12:32 +0200 | [diff] [blame] | 1574 | { |
Ulf Hansson | f104e1e5 | 2015-01-27 21:13:44 +0100 | [diff] [blame] | 1575 | spin_lock_irq(&dev->power.lock); |
| 1576 | |
Ulf Hansson | f104e1e5 | 2015-01-27 21:13:44 +0100 | [diff] [blame] | 1577 | dev->power.subsys_data->domain_data = NULL; |
| 1578 | |
| 1579 | spin_unlock_irq(&dev->power.lock); |
| 1580 | |
Ulf Hansson | 66d29d8 | 2022-05-11 16:56:56 +0200 | [diff] [blame] | 1581 | kfree(gpd_data->td); |
Rafael J. Wysocki | 1d5fcfe | 2012-07-05 22:12:32 +0200 | [diff] [blame] | 1582 | kfree(gpd_data); |
Ulf Hansson | 3e23568 | 2015-01-27 21:13:43 +0100 | [diff] [blame] | 1583 | dev_pm_put_subsys_data(dev); |
Rafael J. Wysocki | 1d5fcfe | 2012-07-05 22:12:32 +0200 | [diff] [blame] | 1584 | } |
| 1585 | |
Ulf Hansson | b24e196 | 2019-04-25 11:04:12 +0200 | [diff] [blame] | 1586 | static void genpd_update_cpumask(struct generic_pm_domain *genpd, |
| 1587 | int cpu, bool set, unsigned int depth) |
Ulf Hansson | eb594b7 | 2019-03-27 15:35:46 +0100 | [diff] [blame] | 1588 | { |
| 1589 | struct gpd_link *link; |
| 1590 | |
| 1591 | if (!genpd_is_cpu_domain(genpd)) |
| 1592 | return; |
| 1593 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 1594 | list_for_each_entry(link, &genpd->child_links, child_node) { |
| 1595 | struct generic_pm_domain *parent = link->parent; |
Ulf Hansson | eb594b7 | 2019-03-27 15:35:46 +0100 | [diff] [blame] | 1596 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 1597 | genpd_lock_nested(parent, depth + 1); |
| 1598 | genpd_update_cpumask(parent, cpu, set, depth + 1); |
| 1599 | genpd_unlock(parent); |
Ulf Hansson | eb594b7 | 2019-03-27 15:35:46 +0100 | [diff] [blame] | 1600 | } |
| 1601 | |
| 1602 | if (set) |
| 1603 | cpumask_set_cpu(cpu, genpd->cpus); |
| 1604 | else |
| 1605 | cpumask_clear_cpu(cpu, genpd->cpus); |
| 1606 | } |
| 1607 | |
Ulf Hansson | b24e196 | 2019-04-25 11:04:12 +0200 | [diff] [blame] | 1608 | static void genpd_set_cpumask(struct generic_pm_domain *genpd, int cpu) |
| 1609 | { |
| 1610 | if (cpu >= 0) |
| 1611 | genpd_update_cpumask(genpd, cpu, true, 0); |
| 1612 | } |
| 1613 | |
| 1614 | static void genpd_clear_cpumask(struct generic_pm_domain *genpd, int cpu) |
| 1615 | { |
| 1616 | if (cpu >= 0) |
| 1617 | genpd_update_cpumask(genpd, cpu, false, 0); |
| 1618 | } |
| 1619 | |
| 1620 | static int genpd_get_cpu(struct generic_pm_domain *genpd, struct device *dev) |
Ulf Hansson | eb594b7 | 2019-03-27 15:35:46 +0100 | [diff] [blame] | 1621 | { |
| 1622 | int cpu; |
| 1623 | |
| 1624 | if (!genpd_is_cpu_domain(genpd)) |
Ulf Hansson | b24e196 | 2019-04-25 11:04:12 +0200 | [diff] [blame] | 1625 | return -1; |
Ulf Hansson | eb594b7 | 2019-03-27 15:35:46 +0100 | [diff] [blame] | 1626 | |
| 1627 | for_each_possible_cpu(cpu) { |
Ulf Hansson | b24e196 | 2019-04-25 11:04:12 +0200 | [diff] [blame] | 1628 | if (get_cpu_device(cpu) == dev) |
| 1629 | return cpu; |
Ulf Hansson | eb594b7 | 2019-03-27 15:35:46 +0100 | [diff] [blame] | 1630 | } |
Ulf Hansson | eb594b7 | 2019-03-27 15:35:46 +0100 | [diff] [blame] | 1631 | |
Ulf Hansson | b24e196 | 2019-04-25 11:04:12 +0200 | [diff] [blame] | 1632 | return -1; |
Ulf Hansson | eb594b7 | 2019-03-27 15:35:46 +0100 | [diff] [blame] | 1633 | } |
| 1634 | |
Ulf Hansson | f9ccd7c | 2019-04-25 11:04:13 +0200 | [diff] [blame] | 1635 | static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
| 1636 | struct device *base_dev) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1637 | { |
Ulf Hansson | f38d1a6 | 2022-05-11 16:57:02 +0200 | [diff] [blame] | 1638 | struct genpd_governor_data *gd = genpd->gd; |
Ulf Hansson | c0356db | 2015-01-27 21:13:42 +0100 | [diff] [blame] | 1639 | struct generic_pm_domain_data *gpd_data; |
Ulf Hansson | f9ccd7c | 2019-04-25 11:04:13 +0200 | [diff] [blame] | 1640 | int ret; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1641 | |
| 1642 | dev_dbg(dev, "%s()\n", __func__); |
| 1643 | |
Ulf Hansson | f38d1a6 | 2022-05-11 16:57:02 +0200 | [diff] [blame] | 1644 | gpd_data = genpd_alloc_dev_data(dev, gd); |
Ulf Hansson | 3e23568 | 2015-01-27 21:13:43 +0100 | [diff] [blame] | 1645 | if (IS_ERR(gpd_data)) |
| 1646 | return PTR_ERR(gpd_data); |
Rafael J. Wysocki | 6ff7bb0d0 | 2012-05-01 21:34:07 +0200 | [diff] [blame] | 1647 | |
Ulf Hansson | f9ccd7c | 2019-04-25 11:04:13 +0200 | [diff] [blame] | 1648 | gpd_data->cpu = genpd_get_cpu(genpd, base_dev); |
Ulf Hansson | b24e196 | 2019-04-25 11:04:12 +0200 | [diff] [blame] | 1649 | |
Ulf Hansson | b472c2f | 2015-01-27 21:13:45 +0100 | [diff] [blame] | 1650 | ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
| 1651 | if (ret) |
| 1652 | goto out; |
Geert Uytterhoeven | d79b6fe | 2014-09-25 18:28:28 +0200 | [diff] [blame] | 1653 | |
Jiada Wang | 2071ac9 | 2019-03-12 15:51:28 +0900 | [diff] [blame] | 1654 | genpd_lock(genpd); |
| 1655 | |
Ulf Hansson | f9ccd7c | 2019-04-25 11:04:13 +0200 | [diff] [blame] | 1656 | genpd_set_cpumask(genpd, gpd_data->cpu); |
Sudeep Holla | 975e83c | 2017-07-14 11:51:48 +0100 | [diff] [blame] | 1657 | dev_pm_domain_set(dev, &genpd->domain); |
| 1658 | |
Ulf Hansson | 14b5306 | 2015-01-27 21:13:40 +0100 | [diff] [blame] | 1659 | genpd->device_count++; |
Ulf Hansson | f38d1a6 | 2022-05-11 16:57:02 +0200 | [diff] [blame] | 1660 | if (gd) |
| 1661 | gd->max_off_time_changed = true; |
Ulf Hansson | 14b5306 | 2015-01-27 21:13:40 +0100 | [diff] [blame] | 1662 | |
Rafael J. Wysocki | 1d5fcfe | 2012-07-05 22:12:32 +0200 | [diff] [blame] | 1663 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
Rafael J. Wysocki | 6ff7bb0d0 | 2012-05-01 21:34:07 +0200 | [diff] [blame] | 1664 | |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 1665 | genpd_unlock(genpd); |
Jiada Wang | 2071ac9 | 2019-03-12 15:51:28 +0900 | [diff] [blame] | 1666 | out: |
Ulf Hansson | c0356db | 2015-01-27 21:13:42 +0100 | [diff] [blame] | 1667 | if (ret) |
| 1668 | genpd_free_dev_data(dev, gpd_data); |
| 1669 | else |
Viresh Kumar | 0b07ee9 | 2019-07-04 13:06:17 +0530 | [diff] [blame] | 1670 | dev_pm_qos_add_notifier(dev, &gpd_data->nb, |
| 1671 | DEV_PM_QOS_RESUME_LATENCY); |
Rafael J. Wysocki | 1d5fcfe | 2012-07-05 22:12:32 +0200 | [diff] [blame] | 1672 | |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1673 | return ret; |
| 1674 | } |
Jon Hunter | 19efa5f | 2016-09-12 12:01:11 +0100 | [diff] [blame] | 1675 | |
| 1676 | /** |
Ulf Hansson | 1a7a670 | 2018-05-29 12:04:14 +0200 | [diff] [blame] | 1677 | * pm_genpd_add_device - Add a device to an I/O PM domain. |
Jon Hunter | 19efa5f | 2016-09-12 12:01:11 +0100 | [diff] [blame] | 1678 | * @genpd: PM domain to add the device to. |
| 1679 | * @dev: Device to be added. |
Jon Hunter | 19efa5f | 2016-09-12 12:01:11 +0100 | [diff] [blame] | 1680 | */ |
Ulf Hansson | 1a7a670 | 2018-05-29 12:04:14 +0200 | [diff] [blame] | 1681 | int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev) |
Jon Hunter | 19efa5f | 2016-09-12 12:01:11 +0100 | [diff] [blame] | 1682 | { |
| 1683 | int ret; |
| 1684 | |
Ulf Hansson | 4384a70 | 2023-05-30 11:55:36 +0200 | [diff] [blame] | 1685 | if (!genpd || !dev) |
| 1686 | return -EINVAL; |
| 1687 | |
Jon Hunter | 19efa5f | 2016-09-12 12:01:11 +0100 | [diff] [blame] | 1688 | mutex_lock(&gpd_list_lock); |
Ulf Hansson | f9ccd7c | 2019-04-25 11:04:13 +0200 | [diff] [blame] | 1689 | ret = genpd_add_device(genpd, dev, dev); |
Jon Hunter | 19efa5f | 2016-09-12 12:01:11 +0100 | [diff] [blame] | 1690 | mutex_unlock(&gpd_list_lock); |
| 1691 | |
| 1692 | return ret; |
| 1693 | } |
Ulf Hansson | 1a7a670 | 2018-05-29 12:04:14 +0200 | [diff] [blame] | 1694 | EXPORT_SYMBOL_GPL(pm_genpd_add_device); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1695 | |
Ulf Hansson | 85168d5 | 2016-09-21 15:38:50 +0200 | [diff] [blame] | 1696 | static int genpd_remove_device(struct generic_pm_domain *genpd, |
| 1697 | struct device *dev) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1698 | { |
Rafael J. Wysocki | 6ff7bb0d0 | 2012-05-01 21:34:07 +0200 | [diff] [blame] | 1699 | struct generic_pm_domain_data *gpd_data; |
Rafael J. Wysocki | 4605ab6 | 2011-08-25 15:34:12 +0200 | [diff] [blame] | 1700 | struct pm_domain_data *pdd; |
Ulf Hansson | f9ccd7c | 2019-04-25 11:04:13 +0200 | [diff] [blame] | 1701 | int ret = 0; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1702 | |
| 1703 | dev_dbg(dev, "%s()\n", __func__); |
| 1704 | |
Ulf Hansson | c0356db | 2015-01-27 21:13:42 +0100 | [diff] [blame] | 1705 | pdd = dev->power.subsys_data->domain_data; |
| 1706 | gpd_data = to_gpd_data(pdd); |
Viresh Kumar | 0b07ee9 | 2019-07-04 13:06:17 +0530 | [diff] [blame] | 1707 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb, |
| 1708 | DEV_PM_QOS_RESUME_LATENCY); |
Ulf Hansson | c0356db | 2015-01-27 21:13:42 +0100 | [diff] [blame] | 1709 | |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 1710 | genpd_lock(genpd); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1711 | |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1712 | if (genpd->prepared_count > 0) { |
| 1713 | ret = -EAGAIN; |
| 1714 | goto out; |
| 1715 | } |
| 1716 | |
Rafael J. Wysocki | 6ff7bb0d0 | 2012-05-01 21:34:07 +0200 | [diff] [blame] | 1717 | genpd->device_count--; |
Ulf Hansson | f38d1a6 | 2022-05-11 16:57:02 +0200 | [diff] [blame] | 1718 | if (genpd->gd) |
| 1719 | genpd->gd->max_off_time_changed = true; |
Rafael J. Wysocki | 6ff7bb0d0 | 2012-05-01 21:34:07 +0200 | [diff] [blame] | 1720 | |
Ulf Hansson | f9ccd7c | 2019-04-25 11:04:13 +0200 | [diff] [blame] | 1721 | genpd_clear_cpumask(genpd, gpd_data->cpu); |
Sudeep Holla | 975e83c | 2017-07-14 11:51:48 +0100 | [diff] [blame] | 1722 | dev_pm_domain_set(dev, NULL); |
| 1723 | |
Rafael J. Wysocki | efa6902 | 2012-05-01 21:33:53 +0200 | [diff] [blame] | 1724 | list_del_init(&pdd->list_node); |
Rafael J. Wysocki | 6ff7bb0d0 | 2012-05-01 21:34:07 +0200 | [diff] [blame] | 1725 | |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 1726 | genpd_unlock(genpd); |
Rafael J. Wysocki | 6ff7bb0d0 | 2012-05-01 21:34:07 +0200 | [diff] [blame] | 1727 | |
Jiada Wang | 2071ac9 | 2019-03-12 15:51:28 +0900 | [diff] [blame] | 1728 | if (genpd->detach_dev) |
| 1729 | genpd->detach_dev(genpd, dev); |
| 1730 | |
Ulf Hansson | c1dbe2f | 2015-01-27 21:13:39 +0100 | [diff] [blame] | 1731 | genpd_free_dev_data(dev, gpd_data); |
Rafael J. Wysocki | 1d5fcfe | 2012-07-05 22:12:32 +0200 | [diff] [blame] | 1732 | |
Rafael J. Wysocki | 6ff7bb0d0 | 2012-05-01 21:34:07 +0200 | [diff] [blame] | 1733 | return 0; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1734 | |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 1735 | out: |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 1736 | genpd_unlock(genpd); |
Viresh Kumar | 0b07ee9 | 2019-07-04 13:06:17 +0530 | [diff] [blame] | 1737 | dev_pm_qos_add_notifier(dev, &gpd_data->nb, DEV_PM_QOS_RESUME_LATENCY); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1738 | |
| 1739 | return ret; |
| 1740 | } |
Ulf Hansson | 85168d5 | 2016-09-21 15:38:50 +0200 | [diff] [blame] | 1741 | |
| 1742 | /** |
| 1743 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. |
Ulf Hansson | 85168d5 | 2016-09-21 15:38:50 +0200 | [diff] [blame] | 1744 | * @dev: Device to be removed. |
| 1745 | */ |
Ulf Hansson | 924f448 | 2018-05-29 12:04:15 +0200 | [diff] [blame] | 1746 | int pm_genpd_remove_device(struct device *dev) |
Ulf Hansson | 85168d5 | 2016-09-21 15:38:50 +0200 | [diff] [blame] | 1747 | { |
Ulf Hansson | b3ad17c | 2019-08-29 16:48:05 +0200 | [diff] [blame] | 1748 | struct generic_pm_domain *genpd = dev_to_genpd_safe(dev); |
Ulf Hansson | 924f448 | 2018-05-29 12:04:15 +0200 | [diff] [blame] | 1749 | |
| 1750 | if (!genpd) |
Ulf Hansson | 85168d5 | 2016-09-21 15:38:50 +0200 | [diff] [blame] | 1751 | return -EINVAL; |
| 1752 | |
| 1753 | return genpd_remove_device(genpd, dev); |
| 1754 | } |
Maruthi Bayyavarapu | 24c96dc | 2015-11-18 01:12:00 +0530 | [diff] [blame] | 1755 | EXPORT_SYMBOL_GPL(pm_genpd_remove_device); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1756 | |
Ulf Hansson | d4f8138 | 2020-10-13 14:23:39 +0200 | [diff] [blame] | 1757 | /** |
| 1758 | * dev_pm_genpd_add_notifier - Add a genpd power on/off notifier for @dev |
| 1759 | * |
| 1760 | * @dev: Device that should be associated with the notifier |
| 1761 | * @nb: The notifier block to register |
| 1762 | * |
| 1763 | * Users may call this function to add a genpd power on/off notifier for an |
| 1764 | * attached @dev. Only one notifier per device is allowed. The notifier is |
| 1765 | * sent when genpd is powering on/off the PM domain. |
| 1766 | * |
| 1767 | * It is assumed that the user guarantee that the genpd wouldn't be detached |
| 1768 | * while this routine is getting called. |
| 1769 | * |
| 1770 | * Returns 0 on success and negative error values on failures. |
| 1771 | */ |
| 1772 | int dev_pm_genpd_add_notifier(struct device *dev, struct notifier_block *nb) |
| 1773 | { |
| 1774 | struct generic_pm_domain *genpd; |
| 1775 | struct generic_pm_domain_data *gpd_data; |
| 1776 | int ret; |
| 1777 | |
| 1778 | genpd = dev_to_genpd_safe(dev); |
| 1779 | if (!genpd) |
| 1780 | return -ENODEV; |
| 1781 | |
| 1782 | if (WARN_ON(!dev->power.subsys_data || |
| 1783 | !dev->power.subsys_data->domain_data)) |
| 1784 | return -EINVAL; |
| 1785 | |
| 1786 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); |
| 1787 | if (gpd_data->power_nb) |
| 1788 | return -EEXIST; |
| 1789 | |
| 1790 | genpd_lock(genpd); |
| 1791 | ret = raw_notifier_chain_register(&genpd->power_notifiers, nb); |
| 1792 | genpd_unlock(genpd); |
| 1793 | |
| 1794 | if (ret) { |
| 1795 | dev_warn(dev, "failed to add notifier for PM domain %s\n", |
| 1796 | genpd->name); |
| 1797 | return ret; |
| 1798 | } |
| 1799 | |
| 1800 | gpd_data->power_nb = nb; |
| 1801 | return 0; |
| 1802 | } |
| 1803 | EXPORT_SYMBOL_GPL(dev_pm_genpd_add_notifier); |
| 1804 | |
| 1805 | /** |
| 1806 | * dev_pm_genpd_remove_notifier - Remove a genpd power on/off notifier for @dev |
| 1807 | * |
| 1808 | * @dev: Device that is associated with the notifier |
| 1809 | * |
| 1810 | * Users may call this function to remove a genpd power on/off notifier for an |
| 1811 | * attached @dev. |
| 1812 | * |
| 1813 | * It is assumed that the user guarantee that the genpd wouldn't be detached |
| 1814 | * while this routine is getting called. |
| 1815 | * |
| 1816 | * Returns 0 on success and negative error values on failures. |
| 1817 | */ |
| 1818 | int dev_pm_genpd_remove_notifier(struct device *dev) |
| 1819 | { |
| 1820 | struct generic_pm_domain *genpd; |
| 1821 | struct generic_pm_domain_data *gpd_data; |
| 1822 | int ret; |
| 1823 | |
| 1824 | genpd = dev_to_genpd_safe(dev); |
| 1825 | if (!genpd) |
| 1826 | return -ENODEV; |
| 1827 | |
| 1828 | if (WARN_ON(!dev->power.subsys_data || |
| 1829 | !dev->power.subsys_data->domain_data)) |
| 1830 | return -EINVAL; |
| 1831 | |
| 1832 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); |
| 1833 | if (!gpd_data->power_nb) |
| 1834 | return -ENODEV; |
| 1835 | |
| 1836 | genpd_lock(genpd); |
| 1837 | ret = raw_notifier_chain_unregister(&genpd->power_notifiers, |
| 1838 | gpd_data->power_nb); |
| 1839 | genpd_unlock(genpd); |
| 1840 | |
| 1841 | if (ret) { |
| 1842 | dev_warn(dev, "failed to remove notifier for PM domain %s\n", |
| 1843 | genpd->name); |
| 1844 | return ret; |
| 1845 | } |
| 1846 | |
| 1847 | gpd_data->power_nb = NULL; |
| 1848 | return 0; |
| 1849 | } |
| 1850 | EXPORT_SYMBOL_GPL(dev_pm_genpd_remove_notifier); |
| 1851 | |
Jon Hunter | 19efa5f | 2016-09-12 12:01:11 +0100 | [diff] [blame] | 1852 | static int genpd_add_subdomain(struct generic_pm_domain *genpd, |
| 1853 | struct generic_pm_domain *subdomain) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1854 | { |
Lina Iyer | 2547923 | 2015-10-28 15:19:50 -0600 | [diff] [blame] | 1855 | struct gpd_link *link, *itr; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1856 | int ret = 0; |
| 1857 | |
Rafael J. Wysocki | fb7268b | 2012-08-07 01:08:37 +0200 | [diff] [blame] | 1858 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
| 1859 | || genpd == subdomain) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1860 | return -EINVAL; |
| 1861 | |
Lina Iyer | d716f47 | 2016-10-14 10:47:55 -0700 | [diff] [blame] | 1862 | /* |
| 1863 | * If the domain can be powered on/off in an IRQ safe |
| 1864 | * context, ensure that the subdomain can also be |
| 1865 | * powered on/off in that context. |
| 1866 | */ |
| 1867 | if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) { |
Dan Carpenter | 44cae7d | 2016-11-10 15:52:15 +0300 | [diff] [blame] | 1868 | WARN(1, "Parent %s of subdomain %s must be IRQ safe\n", |
Lina Iyer | d716f47 | 2016-10-14 10:47:55 -0700 | [diff] [blame] | 1869 | genpd->name, subdomain->name); |
| 1870 | return -EINVAL; |
| 1871 | } |
| 1872 | |
Lina Iyer | 2547923 | 2015-10-28 15:19:50 -0600 | [diff] [blame] | 1873 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
| 1874 | if (!link) |
| 1875 | return -ENOMEM; |
| 1876 | |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 1877 | genpd_lock(subdomain); |
| 1878 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1879 | |
Ulf Hansson | 41e2c8e | 2017-03-20 11:19:20 +0100 | [diff] [blame] | 1880 | if (!genpd_status_on(genpd) && genpd_status_on(subdomain)) { |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1881 | ret = -EINVAL; |
| 1882 | goto out; |
| 1883 | } |
| 1884 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 1885 | list_for_each_entry(itr, &genpd->parent_links, parent_node) { |
| 1886 | if (itr->child == subdomain && itr->parent == genpd) { |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1887 | ret = -EINVAL; |
| 1888 | goto out; |
| 1889 | } |
| 1890 | } |
| 1891 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 1892 | link->parent = genpd; |
| 1893 | list_add_tail(&link->parent_node, &genpd->parent_links); |
| 1894 | link->child = subdomain; |
| 1895 | list_add_tail(&link->child_node, &subdomain->child_links); |
Ulf Hansson | 41e2c8e | 2017-03-20 11:19:20 +0100 | [diff] [blame] | 1896 | if (genpd_status_on(subdomain)) |
Rafael J. Wysocki | c4bb316 | 2011-08-08 23:43:04 +0200 | [diff] [blame] | 1897 | genpd_sd_counter_inc(genpd); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1898 | |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1899 | out: |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 1900 | genpd_unlock(genpd); |
| 1901 | genpd_unlock(subdomain); |
Lina Iyer | 2547923 | 2015-10-28 15:19:50 -0600 | [diff] [blame] | 1902 | if (ret) |
| 1903 | kfree(link); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1904 | return ret; |
| 1905 | } |
Jon Hunter | 19efa5f | 2016-09-12 12:01:11 +0100 | [diff] [blame] | 1906 | |
| 1907 | /** |
| 1908 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 1909 | * @genpd: Leader PM domain to add the subdomain to. |
Jon Hunter | 19efa5f | 2016-09-12 12:01:11 +0100 | [diff] [blame] | 1910 | * @subdomain: Subdomain to be added. |
| 1911 | */ |
| 1912 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, |
| 1913 | struct generic_pm_domain *subdomain) |
| 1914 | { |
| 1915 | int ret; |
| 1916 | |
| 1917 | mutex_lock(&gpd_list_lock); |
| 1918 | ret = genpd_add_subdomain(genpd, subdomain); |
| 1919 | mutex_unlock(&gpd_list_lock); |
| 1920 | |
| 1921 | return ret; |
| 1922 | } |
Stephen Boyd | d60ee96 | 2015-10-01 12:22:53 -0700 | [diff] [blame] | 1923 | EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1924 | |
| 1925 | /** |
| 1926 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 1927 | * @genpd: Leader PM domain to remove the subdomain from. |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 1928 | * @subdomain: Subdomain to be removed. |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1929 | */ |
| 1930 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 1931 | struct generic_pm_domain *subdomain) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1932 | { |
Krzysztof Kozlowski | c6e83ca | 2017-06-28 16:56:18 +0200 | [diff] [blame] | 1933 | struct gpd_link *l, *link; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1934 | int ret = -EINVAL; |
| 1935 | |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 1936 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1937 | return -EINVAL; |
| 1938 | |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 1939 | genpd_lock(subdomain); |
| 1940 | genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1941 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 1942 | if (!list_empty(&subdomain->parent_links) || subdomain->device_count) { |
Joe Perches | 7a5bd12 | 2019-03-04 09:14:38 -0800 | [diff] [blame] | 1943 | pr_warn("%s: unable to remove subdomain %s\n", |
| 1944 | genpd->name, subdomain->name); |
Jon Hunter | 30e7a65 | 2015-09-03 09:10:37 +0100 | [diff] [blame] | 1945 | ret = -EBUSY; |
| 1946 | goto out; |
| 1947 | } |
| 1948 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 1949 | list_for_each_entry_safe(link, l, &genpd->parent_links, parent_node) { |
| 1950 | if (link->child != subdomain) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1951 | continue; |
| 1952 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 1953 | list_del(&link->parent_node); |
| 1954 | list_del(&link->child_node); |
Rafael J. Wysocki | 5063ce1 | 2011-08-08 23:43:40 +0200 | [diff] [blame] | 1955 | kfree(link); |
Ulf Hansson | 41e2c8e | 2017-03-20 11:19:20 +0100 | [diff] [blame] | 1956 | if (genpd_status_on(subdomain)) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1957 | genpd_sd_counter_dec(genpd); |
| 1958 | |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1959 | ret = 0; |
| 1960 | break; |
| 1961 | } |
| 1962 | |
Jon Hunter | 30e7a65 | 2015-09-03 09:10:37 +0100 | [diff] [blame] | 1963 | out: |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 1964 | genpd_unlock(genpd); |
| 1965 | genpd_unlock(subdomain); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1966 | |
| 1967 | return ret; |
| 1968 | } |
Stephen Boyd | d60ee96 | 2015-10-01 12:22:53 -0700 | [diff] [blame] | 1969 | EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 1970 | |
Ulf Hansson | 49a27e2 | 2019-03-27 15:35:45 +0100 | [diff] [blame] | 1971 | static void genpd_free_default_power_state(struct genpd_power_state *states, |
| 1972 | unsigned int state_count) |
| 1973 | { |
| 1974 | kfree(states); |
| 1975 | } |
| 1976 | |
Lina Iyer | 59d65b7 | 2016-10-14 10:47:49 -0700 | [diff] [blame] | 1977 | static int genpd_set_default_power_state(struct generic_pm_domain *genpd) |
| 1978 | { |
| 1979 | struct genpd_power_state *state; |
| 1980 | |
| 1981 | state = kzalloc(sizeof(*state), GFP_KERNEL); |
| 1982 | if (!state) |
| 1983 | return -ENOMEM; |
| 1984 | |
| 1985 | genpd->states = state; |
| 1986 | genpd->state_count = 1; |
Ulf Hansson | 49a27e2 | 2019-03-27 15:35:45 +0100 | [diff] [blame] | 1987 | genpd->free_states = genpd_free_default_power_state; |
Lina Iyer | 59d65b7 | 2016-10-14 10:47:49 -0700 | [diff] [blame] | 1988 | |
| 1989 | return 0; |
| 1990 | } |
| 1991 | |
Ulf Hansson | ba43d6d | 2022-05-11 16:57:01 +0200 | [diff] [blame] | 1992 | static int genpd_alloc_data(struct generic_pm_domain *genpd) |
| 1993 | { |
Ulf Hansson | f38d1a6 | 2022-05-11 16:57:02 +0200 | [diff] [blame] | 1994 | struct genpd_governor_data *gd = NULL; |
Ulf Hansson | ba43d6d | 2022-05-11 16:57:01 +0200 | [diff] [blame] | 1995 | int ret; |
| 1996 | |
| 1997 | if (genpd_is_cpu_domain(genpd) && |
| 1998 | !zalloc_cpumask_var(&genpd->cpus, GFP_KERNEL)) |
| 1999 | return -ENOMEM; |
| 2000 | |
Ulf Hansson | f38d1a6 | 2022-05-11 16:57:02 +0200 | [diff] [blame] | 2001 | if (genpd->gov) { |
| 2002 | gd = kzalloc(sizeof(*gd), GFP_KERNEL); |
| 2003 | if (!gd) { |
| 2004 | ret = -ENOMEM; |
| 2005 | goto free; |
| 2006 | } |
| 2007 | |
| 2008 | gd->max_off_time_ns = -1; |
| 2009 | gd->max_off_time_changed = true; |
| 2010 | gd->next_wakeup = KTIME_MAX; |
Maulik Shah | 1498c50 | 2022-10-18 17:28:35 +0200 | [diff] [blame] | 2011 | gd->next_hrtimer = KTIME_MAX; |
Ulf Hansson | f38d1a6 | 2022-05-11 16:57:02 +0200 | [diff] [blame] | 2012 | } |
| 2013 | |
Ulf Hansson | ba43d6d | 2022-05-11 16:57:01 +0200 | [diff] [blame] | 2014 | /* Use only one "off" state if there were no states declared */ |
| 2015 | if (genpd->state_count == 0) { |
| 2016 | ret = genpd_set_default_power_state(genpd); |
| 2017 | if (ret) |
| 2018 | goto free; |
| 2019 | } |
| 2020 | |
Ulf Hansson | f38d1a6 | 2022-05-11 16:57:02 +0200 | [diff] [blame] | 2021 | genpd->gd = gd; |
Ulf Hansson | ba43d6d | 2022-05-11 16:57:01 +0200 | [diff] [blame] | 2022 | return 0; |
| 2023 | |
| 2024 | free: |
| 2025 | if (genpd_is_cpu_domain(genpd)) |
| 2026 | free_cpumask_var(genpd->cpus); |
Ulf Hansson | f38d1a6 | 2022-05-11 16:57:02 +0200 | [diff] [blame] | 2027 | kfree(gd); |
Ulf Hansson | ba43d6d | 2022-05-11 16:57:01 +0200 | [diff] [blame] | 2028 | return ret; |
| 2029 | } |
| 2030 | |
| 2031 | static void genpd_free_data(struct generic_pm_domain *genpd) |
| 2032 | { |
| 2033 | if (genpd_is_cpu_domain(genpd)) |
| 2034 | free_cpumask_var(genpd->cpus); |
| 2035 | if (genpd->free_states) |
| 2036 | genpd->free_states(genpd->states, genpd->state_count); |
Ulf Hansson | f38d1a6 | 2022-05-11 16:57:02 +0200 | [diff] [blame] | 2037 | kfree(genpd->gd); |
Ulf Hansson | ba43d6d | 2022-05-11 16:57:01 +0200 | [diff] [blame] | 2038 | } |
| 2039 | |
Lina Iyer | d716f47 | 2016-10-14 10:47:55 -0700 | [diff] [blame] | 2040 | static void genpd_lock_init(struct generic_pm_domain *genpd) |
| 2041 | { |
| 2042 | if (genpd->flags & GENPD_FLAG_IRQ_SAFE) { |
| 2043 | spin_lock_init(&genpd->slock); |
| 2044 | genpd->lock_ops = &genpd_spin_ops; |
| 2045 | } else { |
| 2046 | mutex_init(&genpd->mlock); |
| 2047 | genpd->lock_ops = &genpd_mtx_ops; |
| 2048 | } |
| 2049 | } |
| 2050 | |
Rafael J. Wysocki | d23b9b0 | 2011-11-27 13:11:51 +0100 | [diff] [blame] | 2051 | /** |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 2052 | * pm_genpd_init - Initialize a generic I/O PM domain object. |
| 2053 | * @genpd: PM domain object to initialize. |
| 2054 | * @gov: PM domain governor to associate with the domain (may be NULL). |
| 2055 | * @is_off: Initial value of the domain's power_is_off field. |
Ulf Hansson | 7eb231c | 2016-06-17 12:27:52 +0200 | [diff] [blame] | 2056 | * |
| 2057 | * Returns 0 on successful initialization, else a negative error code. |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 2058 | */ |
Ulf Hansson | 7eb231c | 2016-06-17 12:27:52 +0200 | [diff] [blame] | 2059 | int pm_genpd_init(struct generic_pm_domain *genpd, |
| 2060 | struct dev_power_governor *gov, bool is_off) |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 2061 | { |
Lina Iyer | 59d65b7 | 2016-10-14 10:47:49 -0700 | [diff] [blame] | 2062 | int ret; |
| 2063 | |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 2064 | if (IS_ERR_OR_NULL(genpd)) |
Ulf Hansson | 7eb231c | 2016-06-17 12:27:52 +0200 | [diff] [blame] | 2065 | return -EINVAL; |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 2066 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 2067 | INIT_LIST_HEAD(&genpd->parent_links); |
| 2068 | INIT_LIST_HEAD(&genpd->child_links); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 2069 | INIT_LIST_HEAD(&genpd->dev_list); |
Ulf Hansson | d4f8138 | 2020-10-13 14:23:39 +0200 | [diff] [blame] | 2070 | RAW_INIT_NOTIFIER_HEAD(&genpd->power_notifiers); |
Lina Iyer | d716f47 | 2016-10-14 10:47:55 -0700 | [diff] [blame] | 2071 | genpd_lock_init(genpd); |
Rafael J. Wysocki | f721889 | 2011-07-01 22:12:45 +0200 | [diff] [blame] | 2072 | genpd->gov = gov; |
| 2073 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); |
Rafael J. Wysocki | c4bb316 | 2011-08-08 23:43:04 +0200 | [diff] [blame] | 2074 | atomic_set(&genpd->sd_count, 0); |
Ulf Hansson | 49f618e | 2020-09-24 13:04:47 +0200 | [diff] [blame] | 2075 | genpd->status = is_off ? GENPD_STATE_OFF : GENPD_STATE_ON; |
Rafael J. Wysocki | 596ba34 | 2011-07-01 22:13:19 +0200 | [diff] [blame] | 2076 | genpd->device_count = 0; |
Jon Hunter | de0aa06d | 2016-09-12 12:01:12 +0100 | [diff] [blame] | 2077 | genpd->provider = NULL; |
| 2078 | genpd->has_provider = false; |
Ulf Hansson | bd40cbb | 2022-04-19 19:29:16 +0200 | [diff] [blame] | 2079 | genpd->accounting_time = ktime_get_mono_fast_ns(); |
Ulf Hansson | 795bd2e | 2016-03-31 11:21:26 +0200 | [diff] [blame] | 2080 | genpd->domain.ops.runtime_suspend = genpd_runtime_suspend; |
| 2081 | genpd->domain.ops.runtime_resume = genpd_runtime_resume; |
Ulf Hansson | 9e9704e | 2017-10-06 09:02:06 +0200 | [diff] [blame] | 2082 | genpd->domain.ops.prepare = genpd_prepare; |
| 2083 | genpd->domain.ops.suspend_noirq = genpd_suspend_noirq; |
| 2084 | genpd->domain.ops.resume_noirq = genpd_resume_noirq; |
| 2085 | genpd->domain.ops.freeze_noirq = genpd_freeze_noirq; |
| 2086 | genpd->domain.ops.thaw_noirq = genpd_thaw_noirq; |
| 2087 | genpd->domain.ops.poweroff_noirq = genpd_poweroff_noirq; |
| 2088 | genpd->domain.ops.restore_noirq = genpd_restore_noirq; |
| 2089 | genpd->domain.ops.complete = genpd_complete; |
Ulf Hansson | ea71c59 | 2019-10-16 15:16:24 +0200 | [diff] [blame] | 2090 | genpd->domain.start = genpd_dev_pm_start; |
Ulf Hansson | 401e092 | 2023-09-25 15:17:08 +0200 | [diff] [blame] | 2091 | genpd->domain.set_performance_state = genpd_dev_pm_set_performance_state; |
Ulf Hansson | c11f6f5 | 2014-12-01 12:50:21 +0100 | [diff] [blame] | 2092 | |
| 2093 | if (genpd->flags & GENPD_FLAG_PM_CLK) { |
| 2094 | genpd->dev_ops.stop = pm_clk_suspend; |
| 2095 | genpd->dev_ops.start = pm_clk_resume; |
| 2096 | } |
| 2097 | |
Ulf Hansson | 27656dc | 2022-05-11 16:56:51 +0200 | [diff] [blame] | 2098 | /* The always-on governor works better with the corresponding flag. */ |
| 2099 | if (gov == &pm_domain_always_on_gov) |
| 2100 | genpd->flags |= GENPD_FLAG_RPM_ALWAYS_ON; |
| 2101 | |
Ulf Hansson | ffaa42e | 2017-03-20 11:19:21 +0100 | [diff] [blame] | 2102 | /* Always-on domains must be powered on at initialization. */ |
Leonard Crestez | ed61e18 | 2019-04-30 15:06:11 +0000 | [diff] [blame] | 2103 | if ((genpd_is_always_on(genpd) || genpd_is_rpm_always_on(genpd)) && |
Johan Hovold | 129b60c | 2022-09-29 17:42:14 +0200 | [diff] [blame] | 2104 | !genpd_status_on(genpd)) { |
| 2105 | pr_err("always-on PM domain %s is not on\n", genpd->name); |
Ulf Hansson | ffaa42e | 2017-03-20 11:19:21 +0100 | [diff] [blame] | 2106 | return -EINVAL; |
Johan Hovold | 129b60c | 2022-09-29 17:42:14 +0200 | [diff] [blame] | 2107 | } |
Ulf Hansson | ffaa42e | 2017-03-20 11:19:21 +0100 | [diff] [blame] | 2108 | |
Ulf Hansson | ba43d6d | 2022-05-11 16:57:01 +0200 | [diff] [blame] | 2109 | /* Multiple states but no governor doesn't make sense. */ |
| 2110 | if (!gov && genpd->state_count > 1) |
Joe Perches | 7a5bd12 | 2019-03-04 09:14:38 -0800 | [diff] [blame] | 2111 | pr_warn("%s: no governor for states\n", genpd->name); |
Ulf Hansson | ba43d6d | 2022-05-11 16:57:01 +0200 | [diff] [blame] | 2112 | |
| 2113 | ret = genpd_alloc_data(genpd); |
| 2114 | if (ret) |
| 2115 | return ret; |
Axel Haslam | fc5cbf0 | 2016-02-15 11:10:51 +0100 | [diff] [blame] | 2116 | |
Viresh Kumar | 401ea15 | 2017-03-17 11:26:19 +0530 | [diff] [blame] | 2117 | device_initialize(&genpd->dev); |
| 2118 | dev_set_name(&genpd->dev, "%s", genpd->name); |
| 2119 | |
Rafael J. Wysocki | 5125bbf38 | 2011-07-13 12:31:52 +0200 | [diff] [blame] | 2120 | mutex_lock(&gpd_list_lock); |
| 2121 | list_add(&genpd->gpd_list_node, &gpd_list); |
| 2122 | mutex_unlock(&gpd_list_lock); |
Stephen Boyd | 40ba55e | 2021-06-24 13:18:02 -0700 | [diff] [blame] | 2123 | genpd_debug_add(genpd); |
Ulf Hansson | 7eb231c | 2016-06-17 12:27:52 +0200 | [diff] [blame] | 2124 | |
| 2125 | return 0; |
Rafael J. Wysocki | 5125bbf38 | 2011-07-13 12:31:52 +0200 | [diff] [blame] | 2126 | } |
Rajendra Nayak | be5ed55 | 2015-08-13 11:51:57 +0530 | [diff] [blame] | 2127 | EXPORT_SYMBOL_GPL(pm_genpd_init); |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2128 | |
Jon Hunter | 3fe5771 | 2016-09-12 12:01:13 +0100 | [diff] [blame] | 2129 | static int genpd_remove(struct generic_pm_domain *genpd) |
| 2130 | { |
| 2131 | struct gpd_link *l, *link; |
| 2132 | |
| 2133 | if (IS_ERR_OR_NULL(genpd)) |
| 2134 | return -EINVAL; |
| 2135 | |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 2136 | genpd_lock(genpd); |
Jon Hunter | 3fe5771 | 2016-09-12 12:01:13 +0100 | [diff] [blame] | 2137 | |
| 2138 | if (genpd->has_provider) { |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 2139 | genpd_unlock(genpd); |
Jon Hunter | 3fe5771 | 2016-09-12 12:01:13 +0100 | [diff] [blame] | 2140 | pr_err("Provider present, unable to remove %s\n", genpd->name); |
| 2141 | return -EBUSY; |
| 2142 | } |
| 2143 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 2144 | if (!list_empty(&genpd->parent_links) || genpd->device_count) { |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 2145 | genpd_unlock(genpd); |
Jon Hunter | 3fe5771 | 2016-09-12 12:01:13 +0100 | [diff] [blame] | 2146 | pr_err("%s: unable to remove %s\n", __func__, genpd->name); |
| 2147 | return -EBUSY; |
| 2148 | } |
| 2149 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 2150 | list_for_each_entry_safe(link, l, &genpd->child_links, child_node) { |
| 2151 | list_del(&link->parent_node); |
| 2152 | list_del(&link->child_node); |
Jon Hunter | 3fe5771 | 2016-09-12 12:01:13 +0100 | [diff] [blame] | 2153 | kfree(link); |
| 2154 | } |
| 2155 | |
| 2156 | list_del(&genpd->gpd_list_node); |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 2157 | genpd_unlock(genpd); |
Shawn Guo | f6bfe8b | 2022-02-25 14:48:15 +0800 | [diff] [blame] | 2158 | genpd_debug_remove(genpd); |
Jon Hunter | 3fe5771 | 2016-09-12 12:01:13 +0100 | [diff] [blame] | 2159 | cancel_work_sync(&genpd->power_off_work); |
Ulf Hansson | ba43d6d | 2022-05-11 16:57:01 +0200 | [diff] [blame] | 2160 | genpd_free_data(genpd); |
Ulf Hansson | 49a27e2 | 2019-03-27 15:35:45 +0100 | [diff] [blame] | 2161 | |
Jon Hunter | 3fe5771 | 2016-09-12 12:01:13 +0100 | [diff] [blame] | 2162 | pr_debug("%s: removed %s\n", __func__, genpd->name); |
| 2163 | |
| 2164 | return 0; |
| 2165 | } |
| 2166 | |
| 2167 | /** |
| 2168 | * pm_genpd_remove - Remove a generic I/O PM domain |
| 2169 | * @genpd: Pointer to PM domain that is to be removed. |
| 2170 | * |
| 2171 | * To remove the PM domain, this function: |
| 2172 | * - Removes the PM domain as a subdomain to any parent domains, |
| 2173 | * if it was added. |
| 2174 | * - Removes the PM domain from the list of registered PM domains. |
| 2175 | * |
| 2176 | * The PM domain will only be removed, if the associated provider has |
| 2177 | * been removed, it is not a parent to any other PM domain and has no |
| 2178 | * devices associated with it. |
| 2179 | */ |
| 2180 | int pm_genpd_remove(struct generic_pm_domain *genpd) |
| 2181 | { |
| 2182 | int ret; |
| 2183 | |
| 2184 | mutex_lock(&gpd_list_lock); |
| 2185 | ret = genpd_remove(genpd); |
| 2186 | mutex_unlock(&gpd_list_lock); |
| 2187 | |
| 2188 | return ret; |
| 2189 | } |
| 2190 | EXPORT_SYMBOL_GPL(pm_genpd_remove); |
| 2191 | |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2192 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF |
Jon Hunter | 892ebdcc | 2016-09-12 12:01:09 +0100 | [diff] [blame] | 2193 | |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2194 | /* |
| 2195 | * Device Tree based PM domain providers. |
| 2196 | * |
| 2197 | * The code below implements generic device tree based PM domain providers that |
| 2198 | * bind device tree nodes with generic PM domains registered in the system. |
| 2199 | * |
| 2200 | * Any driver that registers generic PM domains and needs to support binding of |
| 2201 | * devices to these domains is supposed to register a PM domain provider, which |
| 2202 | * maps a PM domain specifier retrieved from the device tree to a PM domain. |
| 2203 | * |
| 2204 | * Two simple mapping functions have been provided for convenience: |
Jon Hunter | 892ebdcc | 2016-09-12 12:01:09 +0100 | [diff] [blame] | 2205 | * - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. |
| 2206 | * - genpd_xlate_onecell() for mapping of multiple PM domains per node by |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2207 | * index. |
| 2208 | */ |
| 2209 | |
| 2210 | /** |
| 2211 | * struct of_genpd_provider - PM domain provider registration structure |
| 2212 | * @link: Entry in global list of PM domain providers |
| 2213 | * @node: Pointer to device tree node of PM domain provider |
| 2214 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells |
| 2215 | * into a PM domain. |
| 2216 | * @data: context pointer to be passed into @xlate callback |
| 2217 | */ |
| 2218 | struct of_genpd_provider { |
| 2219 | struct list_head link; |
| 2220 | struct device_node *node; |
| 2221 | genpd_xlate_t xlate; |
| 2222 | void *data; |
| 2223 | }; |
| 2224 | |
| 2225 | /* List of registered PM domain providers. */ |
| 2226 | static LIST_HEAD(of_genpd_providers); |
| 2227 | /* Mutex to protect the list above. */ |
| 2228 | static DEFINE_MUTEX(of_genpd_mutex); |
| 2229 | |
| 2230 | /** |
Jon Hunter | 892ebdcc | 2016-09-12 12:01:09 +0100 | [diff] [blame] | 2231 | * genpd_xlate_simple() - Xlate function for direct node-domain mapping |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2232 | * @genpdspec: OF phandle args to map into a PM domain |
| 2233 | * @data: xlate function private data - pointer to struct generic_pm_domain |
| 2234 | * |
| 2235 | * This is a generic xlate function that can be used to model PM domains that |
| 2236 | * have their own device tree nodes. The private data of xlate function needs |
| 2237 | * to be a valid pointer to struct generic_pm_domain. |
| 2238 | */ |
Jon Hunter | 892ebdcc | 2016-09-12 12:01:09 +0100 | [diff] [blame] | 2239 | static struct generic_pm_domain *genpd_xlate_simple( |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2240 | struct of_phandle_args *genpdspec, |
| 2241 | void *data) |
| 2242 | { |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2243 | return data; |
| 2244 | } |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2245 | |
| 2246 | /** |
Jon Hunter | 892ebdcc | 2016-09-12 12:01:09 +0100 | [diff] [blame] | 2247 | * genpd_xlate_onecell() - Xlate function using a single index. |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2248 | * @genpdspec: OF phandle args to map into a PM domain |
| 2249 | * @data: xlate function private data - pointer to struct genpd_onecell_data |
| 2250 | * |
| 2251 | * This is a generic xlate function that can be used to model simple PM domain |
| 2252 | * controllers that have one device tree node and provide multiple PM domains. |
| 2253 | * A single cell is used as an index into an array of PM domains specified in |
| 2254 | * the genpd_onecell_data struct when registering the provider. |
| 2255 | */ |
Jon Hunter | 892ebdcc | 2016-09-12 12:01:09 +0100 | [diff] [blame] | 2256 | static struct generic_pm_domain *genpd_xlate_onecell( |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2257 | struct of_phandle_args *genpdspec, |
| 2258 | void *data) |
| 2259 | { |
| 2260 | struct genpd_onecell_data *genpd_data = data; |
| 2261 | unsigned int idx = genpdspec->args[0]; |
| 2262 | |
| 2263 | if (genpdspec->args_count != 1) |
| 2264 | return ERR_PTR(-EINVAL); |
| 2265 | |
| 2266 | if (idx >= genpd_data->num_domains) { |
| 2267 | pr_err("%s: invalid domain index %u\n", __func__, idx); |
| 2268 | return ERR_PTR(-EINVAL); |
| 2269 | } |
| 2270 | |
| 2271 | if (!genpd_data->domains[idx]) |
| 2272 | return ERR_PTR(-ENOENT); |
| 2273 | |
| 2274 | return genpd_data->domains[idx]; |
| 2275 | } |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2276 | |
| 2277 | /** |
Jon Hunter | 892ebdcc | 2016-09-12 12:01:09 +0100 | [diff] [blame] | 2278 | * genpd_add_provider() - Register a PM domain provider for a node |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2279 | * @np: Device node pointer associated with the PM domain provider. |
| 2280 | * @xlate: Callback for decoding PM domain from phandle arguments. |
| 2281 | * @data: Context pointer for @xlate callback. |
| 2282 | */ |
Jon Hunter | 892ebdcc | 2016-09-12 12:01:09 +0100 | [diff] [blame] | 2283 | static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, |
| 2284 | void *data) |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2285 | { |
| 2286 | struct of_genpd_provider *cp; |
| 2287 | |
| 2288 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); |
| 2289 | if (!cp) |
| 2290 | return -ENOMEM; |
| 2291 | |
| 2292 | cp->node = of_node_get(np); |
| 2293 | cp->data = data; |
| 2294 | cp->xlate = xlate; |
Saravana Kannan | bab2d71 | 2021-02-05 14:26:43 -0800 | [diff] [blame] | 2295 | fwnode_dev_initialized(&np->fwnode, true); |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2296 | |
| 2297 | mutex_lock(&of_genpd_mutex); |
| 2298 | list_add(&cp->link, &of_genpd_providers); |
| 2299 | mutex_unlock(&of_genpd_mutex); |
Rob Herring | ea11e94 | 2017-07-18 16:42:50 -0500 | [diff] [blame] | 2300 | pr_debug("Added domain provider from %pOF\n", np); |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2301 | |
| 2302 | return 0; |
| 2303 | } |
Jon Hunter | 892ebdcc | 2016-09-12 12:01:09 +0100 | [diff] [blame] | 2304 | |
Ulf Hansson | fe0c2baa | 2019-10-16 16:16:49 +0200 | [diff] [blame] | 2305 | static bool genpd_present(const struct generic_pm_domain *genpd) |
| 2306 | { |
Stephen Boyd | 40ba55e | 2021-06-24 13:18:02 -0700 | [diff] [blame] | 2307 | bool ret = false; |
Ulf Hansson | fe0c2baa | 2019-10-16 16:16:49 +0200 | [diff] [blame] | 2308 | const struct generic_pm_domain *gpd; |
| 2309 | |
Stephen Boyd | 40ba55e | 2021-06-24 13:18:02 -0700 | [diff] [blame] | 2310 | mutex_lock(&gpd_list_lock); |
| 2311 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { |
| 2312 | if (gpd == genpd) { |
| 2313 | ret = true; |
| 2314 | break; |
| 2315 | } |
| 2316 | } |
| 2317 | mutex_unlock(&gpd_list_lock); |
| 2318 | |
| 2319 | return ret; |
Ulf Hansson | fe0c2baa | 2019-10-16 16:16:49 +0200 | [diff] [blame] | 2320 | } |
| 2321 | |
Jon Hunter | 892ebdcc | 2016-09-12 12:01:09 +0100 | [diff] [blame] | 2322 | /** |
| 2323 | * of_genpd_add_provider_simple() - Register a simple PM domain provider |
| 2324 | * @np: Device node pointer associated with the PM domain provider. |
| 2325 | * @genpd: Pointer to PM domain associated with the PM domain provider. |
| 2326 | */ |
| 2327 | int of_genpd_add_provider_simple(struct device_node *np, |
| 2328 | struct generic_pm_domain *genpd) |
| 2329 | { |
Stephen Boyd | 40ba55e | 2021-06-24 13:18:02 -0700 | [diff] [blame] | 2330 | int ret; |
Jon Hunter | 0159ec6 | 2016-09-12 12:01:10 +0100 | [diff] [blame] | 2331 | |
| 2332 | if (!np || !genpd) |
| 2333 | return -EINVAL; |
| 2334 | |
Viresh Kumar | 6a0ae73 | 2018-04-05 15:53:34 +0530 | [diff] [blame] | 2335 | if (!genpd_present(genpd)) |
Stephen Boyd | 40ba55e | 2021-06-24 13:18:02 -0700 | [diff] [blame] | 2336 | return -EINVAL; |
Viresh Kumar | 6a0ae73 | 2018-04-05 15:53:34 +0530 | [diff] [blame] | 2337 | |
| 2338 | genpd->dev.of_node = np; |
| 2339 | |
| 2340 | /* Parse genpd OPP table */ |
Ulf Hansson | 3dd9151 | 2023-08-25 13:26:32 +0200 | [diff] [blame] | 2341 | if (!genpd_is_opp_table_fw(genpd) && genpd->set_performance_state) { |
Viresh Kumar | 6a0ae73 | 2018-04-05 15:53:34 +0530 | [diff] [blame] | 2342 | ret = dev_pm_opp_of_add_table(&genpd->dev); |
Ahmad Fatoum | 9a6582b | 2022-02-23 09:03:23 +0100 | [diff] [blame] | 2343 | if (ret) |
| 2344 | return dev_err_probe(&genpd->dev, ret, "Failed to add OPP table\n"); |
Viresh Kumar | 1067ae3 | 2018-11-02 11:18:08 +0530 | [diff] [blame] | 2345 | |
| 2346 | /* |
| 2347 | * Save table for faster processing while setting performance |
| 2348 | * state. |
| 2349 | */ |
| 2350 | genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev); |
Stephan Gerhold | dd461cd | 2020-07-27 11:30:46 +0200 | [diff] [blame] | 2351 | WARN_ON(IS_ERR(genpd->opp_table)); |
Jon Hunter | de0aa06d | 2016-09-12 12:01:12 +0100 | [diff] [blame] | 2352 | } |
| 2353 | |
Viresh Kumar | 6a0ae73 | 2018-04-05 15:53:34 +0530 | [diff] [blame] | 2354 | ret = genpd_add_provider(np, genpd_xlate_simple, genpd); |
| 2355 | if (ret) { |
Ulf Hansson | 3dd9151 | 2023-08-25 13:26:32 +0200 | [diff] [blame] | 2356 | if (!genpd_is_opp_table_fw(genpd) && genpd->set_performance_state) { |
Viresh Kumar | 1067ae3 | 2018-11-02 11:18:08 +0530 | [diff] [blame] | 2357 | dev_pm_opp_put_opp_table(genpd->opp_table); |
Viresh Kumar | 6a0ae73 | 2018-04-05 15:53:34 +0530 | [diff] [blame] | 2358 | dev_pm_opp_of_remove_table(&genpd->dev); |
Viresh Kumar | 1067ae3 | 2018-11-02 11:18:08 +0530 | [diff] [blame] | 2359 | } |
Viresh Kumar | 6a0ae73 | 2018-04-05 15:53:34 +0530 | [diff] [blame] | 2360 | |
Stephen Boyd | 40ba55e | 2021-06-24 13:18:02 -0700 | [diff] [blame] | 2361 | return ret; |
Viresh Kumar | 6a0ae73 | 2018-04-05 15:53:34 +0530 | [diff] [blame] | 2362 | } |
| 2363 | |
| 2364 | genpd->provider = &np->fwnode; |
| 2365 | genpd->has_provider = true; |
| 2366 | |
Stephen Boyd | 40ba55e | 2021-06-24 13:18:02 -0700 | [diff] [blame] | 2367 | return 0; |
Jon Hunter | 892ebdcc | 2016-09-12 12:01:09 +0100 | [diff] [blame] | 2368 | } |
| 2369 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple); |
| 2370 | |
| 2371 | /** |
| 2372 | * of_genpd_add_provider_onecell() - Register a onecell PM domain provider |
| 2373 | * @np: Device node pointer associated with the PM domain provider. |
| 2374 | * @data: Pointer to the data associated with the PM domain provider. |
| 2375 | */ |
| 2376 | int of_genpd_add_provider_onecell(struct device_node *np, |
| 2377 | struct genpd_onecell_data *data) |
| 2378 | { |
Viresh Kumar | 6a0ae73 | 2018-04-05 15:53:34 +0530 | [diff] [blame] | 2379 | struct generic_pm_domain *genpd; |
Jon Hunter | 0159ec6 | 2016-09-12 12:01:10 +0100 | [diff] [blame] | 2380 | unsigned int i; |
Jon Hunter | de0aa06d | 2016-09-12 12:01:12 +0100 | [diff] [blame] | 2381 | int ret = -EINVAL; |
Jon Hunter | 0159ec6 | 2016-09-12 12:01:10 +0100 | [diff] [blame] | 2382 | |
| 2383 | if (!np || !data) |
| 2384 | return -EINVAL; |
| 2385 | |
Thierry Reding | 4084552 | 2017-03-29 18:34:50 +0200 | [diff] [blame] | 2386 | if (!data->xlate) |
| 2387 | data->xlate = genpd_xlate_onecell; |
| 2388 | |
Jon Hunter | 0159ec6 | 2016-09-12 12:01:10 +0100 | [diff] [blame] | 2389 | for (i = 0; i < data->num_domains; i++) { |
Viresh Kumar | 6a0ae73 | 2018-04-05 15:53:34 +0530 | [diff] [blame] | 2390 | genpd = data->domains[i]; |
| 2391 | |
| 2392 | if (!genpd) |
Tomeu Vizoso | 609bed6 | 2016-09-15 14:05:23 +0200 | [diff] [blame] | 2393 | continue; |
Viresh Kumar | 6a0ae73 | 2018-04-05 15:53:34 +0530 | [diff] [blame] | 2394 | if (!genpd_present(genpd)) |
Jon Hunter | de0aa06d | 2016-09-12 12:01:12 +0100 | [diff] [blame] | 2395 | goto error; |
| 2396 | |
Viresh Kumar | 6a0ae73 | 2018-04-05 15:53:34 +0530 | [diff] [blame] | 2397 | genpd->dev.of_node = np; |
| 2398 | |
| 2399 | /* Parse genpd OPP table */ |
Ulf Hansson | 3dd9151 | 2023-08-25 13:26:32 +0200 | [diff] [blame] | 2400 | if (!genpd_is_opp_table_fw(genpd) && genpd->set_performance_state) { |
Viresh Kumar | 6a0ae73 | 2018-04-05 15:53:34 +0530 | [diff] [blame] | 2401 | ret = dev_pm_opp_of_add_table_indexed(&genpd->dev, i); |
| 2402 | if (ret) { |
Ahmad Fatoum | 9a6582b | 2022-02-23 09:03:23 +0100 | [diff] [blame] | 2403 | dev_err_probe(&genpd->dev, ret, |
| 2404 | "Failed to add OPP table for index %d\n", i); |
Viresh Kumar | 6a0ae73 | 2018-04-05 15:53:34 +0530 | [diff] [blame] | 2405 | goto error; |
| 2406 | } |
Viresh Kumar | 1067ae3 | 2018-11-02 11:18:08 +0530 | [diff] [blame] | 2407 | |
| 2408 | /* |
| 2409 | * Save table for faster processing while setting |
| 2410 | * performance state. |
| 2411 | */ |
Viresh Kumar | e77dcb0 | 2020-11-06 10:37:16 +0530 | [diff] [blame] | 2412 | genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev); |
Stephan Gerhold | dd461cd | 2020-07-27 11:30:46 +0200 | [diff] [blame] | 2413 | WARN_ON(IS_ERR(genpd->opp_table)); |
Viresh Kumar | 6a0ae73 | 2018-04-05 15:53:34 +0530 | [diff] [blame] | 2414 | } |
| 2415 | |
| 2416 | genpd->provider = &np->fwnode; |
| 2417 | genpd->has_provider = true; |
Jon Hunter | 0159ec6 | 2016-09-12 12:01:10 +0100 | [diff] [blame] | 2418 | } |
| 2419 | |
Thierry Reding | 4084552 | 2017-03-29 18:34:50 +0200 | [diff] [blame] | 2420 | ret = genpd_add_provider(np, data->xlate, data); |
Jon Hunter | de0aa06d | 2016-09-12 12:01:12 +0100 | [diff] [blame] | 2421 | if (ret < 0) |
| 2422 | goto error; |
| 2423 | |
Jon Hunter | de0aa06d | 2016-09-12 12:01:12 +0100 | [diff] [blame] | 2424 | return 0; |
| 2425 | |
| 2426 | error: |
| 2427 | while (i--) { |
Viresh Kumar | 6a0ae73 | 2018-04-05 15:53:34 +0530 | [diff] [blame] | 2428 | genpd = data->domains[i]; |
| 2429 | |
| 2430 | if (!genpd) |
Tomeu Vizoso | 609bed6 | 2016-09-15 14:05:23 +0200 | [diff] [blame] | 2431 | continue; |
Viresh Kumar | 6a0ae73 | 2018-04-05 15:53:34 +0530 | [diff] [blame] | 2432 | |
| 2433 | genpd->provider = NULL; |
| 2434 | genpd->has_provider = false; |
| 2435 | |
Ulf Hansson | 3dd9151 | 2023-08-25 13:26:32 +0200 | [diff] [blame] | 2436 | if (!genpd_is_opp_table_fw(genpd) && genpd->set_performance_state) { |
Viresh Kumar | 1067ae3 | 2018-11-02 11:18:08 +0530 | [diff] [blame] | 2437 | dev_pm_opp_put_opp_table(genpd->opp_table); |
Viresh Kumar | 6a0ae73 | 2018-04-05 15:53:34 +0530 | [diff] [blame] | 2438 | dev_pm_opp_of_remove_table(&genpd->dev); |
Viresh Kumar | 1067ae3 | 2018-11-02 11:18:08 +0530 | [diff] [blame] | 2439 | } |
Jon Hunter | de0aa06d | 2016-09-12 12:01:12 +0100 | [diff] [blame] | 2440 | } |
Jon Hunter | 0159ec6 | 2016-09-12 12:01:10 +0100 | [diff] [blame] | 2441 | |
Jon Hunter | 0159ec6 | 2016-09-12 12:01:10 +0100 | [diff] [blame] | 2442 | return ret; |
Jon Hunter | 892ebdcc | 2016-09-12 12:01:09 +0100 | [diff] [blame] | 2443 | } |
| 2444 | EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell); |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2445 | |
| 2446 | /** |
| 2447 | * of_genpd_del_provider() - Remove a previously registered PM domain provider |
| 2448 | * @np: Device node pointer associated with the PM domain provider |
| 2449 | */ |
| 2450 | void of_genpd_del_provider(struct device_node *np) |
| 2451 | { |
Krzysztof Kozlowski | b556b15 | 2017-06-28 16:56:19 +0200 | [diff] [blame] | 2452 | struct of_genpd_provider *cp, *tmp; |
Jon Hunter | de0aa06d | 2016-09-12 12:01:12 +0100 | [diff] [blame] | 2453 | struct generic_pm_domain *gpd; |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2454 | |
Jon Hunter | de0aa06d | 2016-09-12 12:01:12 +0100 | [diff] [blame] | 2455 | mutex_lock(&gpd_list_lock); |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2456 | mutex_lock(&of_genpd_mutex); |
Krzysztof Kozlowski | b556b15 | 2017-06-28 16:56:19 +0200 | [diff] [blame] | 2457 | list_for_each_entry_safe(cp, tmp, &of_genpd_providers, link) { |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2458 | if (cp->node == np) { |
Jon Hunter | de0aa06d | 2016-09-12 12:01:12 +0100 | [diff] [blame] | 2459 | /* |
| 2460 | * For each PM domain associated with the |
| 2461 | * provider, set the 'has_provider' to false |
| 2462 | * so that the PM domain can be safely removed. |
| 2463 | */ |
Viresh Kumar | 6a0ae73 | 2018-04-05 15:53:34 +0530 | [diff] [blame] | 2464 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { |
| 2465 | if (gpd->provider == &np->fwnode) { |
Jon Hunter | de0aa06d | 2016-09-12 12:01:12 +0100 | [diff] [blame] | 2466 | gpd->has_provider = false; |
| 2467 | |
Ulf Hansson | 3dd9151 | 2023-08-25 13:26:32 +0200 | [diff] [blame] | 2468 | if (genpd_is_opp_table_fw(gpd) || !gpd->set_performance_state) |
Viresh Kumar | 6a0ae73 | 2018-04-05 15:53:34 +0530 | [diff] [blame] | 2469 | continue; |
| 2470 | |
Viresh Kumar | 1067ae3 | 2018-11-02 11:18:08 +0530 | [diff] [blame] | 2471 | dev_pm_opp_put_opp_table(gpd->opp_table); |
Viresh Kumar | 6a0ae73 | 2018-04-05 15:53:34 +0530 | [diff] [blame] | 2472 | dev_pm_opp_of_remove_table(&gpd->dev); |
| 2473 | } |
| 2474 | } |
| 2475 | |
Saravana Kannan | bab2d71 | 2021-02-05 14:26:43 -0800 | [diff] [blame] | 2476 | fwnode_dev_initialized(&cp->node->fwnode, false); |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2477 | list_del(&cp->link); |
| 2478 | of_node_put(cp->node); |
| 2479 | kfree(cp); |
| 2480 | break; |
| 2481 | } |
| 2482 | } |
| 2483 | mutex_unlock(&of_genpd_mutex); |
Jon Hunter | de0aa06d | 2016-09-12 12:01:12 +0100 | [diff] [blame] | 2484 | mutex_unlock(&gpd_list_lock); |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2485 | } |
| 2486 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); |
| 2487 | |
| 2488 | /** |
Jon Hunter | f58d4e5 | 2016-09-12 12:01:08 +0100 | [diff] [blame] | 2489 | * genpd_get_from_provider() - Look-up PM domain |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2490 | * @genpdspec: OF phandle args to use for look-up |
| 2491 | * |
| 2492 | * Looks for a PM domain provider under the node specified by @genpdspec and if |
| 2493 | * found, uses xlate function of the provider to map phandle args to a PM |
| 2494 | * domain. |
| 2495 | * |
| 2496 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() |
| 2497 | * on failure. |
| 2498 | */ |
Jon Hunter | f58d4e5 | 2016-09-12 12:01:08 +0100 | [diff] [blame] | 2499 | static struct generic_pm_domain *genpd_get_from_provider( |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2500 | struct of_phandle_args *genpdspec) |
| 2501 | { |
| 2502 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); |
| 2503 | struct of_genpd_provider *provider; |
| 2504 | |
Jon Hunter | 41795a8 | 2016-03-04 10:55:15 +0000 | [diff] [blame] | 2505 | if (!genpdspec) |
| 2506 | return ERR_PTR(-EINVAL); |
| 2507 | |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2508 | mutex_lock(&of_genpd_mutex); |
| 2509 | |
| 2510 | /* Check if we have such a provider in our array */ |
| 2511 | list_for_each_entry(provider, &of_genpd_providers, link) { |
| 2512 | if (provider->node == genpdspec->np) |
| 2513 | genpd = provider->xlate(genpdspec, provider->data); |
| 2514 | if (!IS_ERR(genpd)) |
| 2515 | break; |
| 2516 | } |
| 2517 | |
| 2518 | mutex_unlock(&of_genpd_mutex); |
| 2519 | |
| 2520 | return genpd; |
| 2521 | } |
| 2522 | |
| 2523 | /** |
Jon Hunter | ec69572 | 2016-09-12 12:01:05 +0100 | [diff] [blame] | 2524 | * of_genpd_add_device() - Add a device to an I/O PM domain |
| 2525 | * @genpdspec: OF phandle args to use for look-up PM domain |
| 2526 | * @dev: Device to be added. |
| 2527 | * |
| 2528 | * Looks-up an I/O PM domain based upon phandle args provided and adds |
| 2529 | * the device to the PM domain. Returns a negative error code on failure. |
| 2530 | */ |
| 2531 | int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev) |
| 2532 | { |
| 2533 | struct generic_pm_domain *genpd; |
Jon Hunter | 19efa5f | 2016-09-12 12:01:11 +0100 | [diff] [blame] | 2534 | int ret; |
| 2535 | |
Ulf Hansson | 4384a70 | 2023-05-30 11:55:36 +0200 | [diff] [blame] | 2536 | if (!dev) |
| 2537 | return -EINVAL; |
| 2538 | |
Jon Hunter | 19efa5f | 2016-09-12 12:01:11 +0100 | [diff] [blame] | 2539 | mutex_lock(&gpd_list_lock); |
Jon Hunter | ec69572 | 2016-09-12 12:01:05 +0100 | [diff] [blame] | 2540 | |
Jon Hunter | f58d4e5 | 2016-09-12 12:01:08 +0100 | [diff] [blame] | 2541 | genpd = genpd_get_from_provider(genpdspec); |
Jon Hunter | 19efa5f | 2016-09-12 12:01:11 +0100 | [diff] [blame] | 2542 | if (IS_ERR(genpd)) { |
| 2543 | ret = PTR_ERR(genpd); |
| 2544 | goto out; |
| 2545 | } |
Jon Hunter | ec69572 | 2016-09-12 12:01:05 +0100 | [diff] [blame] | 2546 | |
Ulf Hansson | f9ccd7c | 2019-04-25 11:04:13 +0200 | [diff] [blame] | 2547 | ret = genpd_add_device(genpd, dev, dev); |
Jon Hunter | 19efa5f | 2016-09-12 12:01:11 +0100 | [diff] [blame] | 2548 | |
| 2549 | out: |
| 2550 | mutex_unlock(&gpd_list_lock); |
| 2551 | |
| 2552 | return ret; |
Jon Hunter | ec69572 | 2016-09-12 12:01:05 +0100 | [diff] [blame] | 2553 | } |
| 2554 | EXPORT_SYMBOL_GPL(of_genpd_add_device); |
| 2555 | |
| 2556 | /** |
| 2557 | * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain. |
| 2558 | * @parent_spec: OF phandle args to use for parent PM domain look-up |
| 2559 | * @subdomain_spec: OF phandle args to use for subdomain look-up |
| 2560 | * |
| 2561 | * Looks-up a parent PM domain and subdomain based upon phandle args |
| 2562 | * provided and adds the subdomain to the parent PM domain. Returns a |
| 2563 | * negative error code on failure. |
| 2564 | */ |
| 2565 | int of_genpd_add_subdomain(struct of_phandle_args *parent_spec, |
| 2566 | struct of_phandle_args *subdomain_spec) |
| 2567 | { |
| 2568 | struct generic_pm_domain *parent, *subdomain; |
Jon Hunter | 19efa5f | 2016-09-12 12:01:11 +0100 | [diff] [blame] | 2569 | int ret; |
| 2570 | |
| 2571 | mutex_lock(&gpd_list_lock); |
Jon Hunter | ec69572 | 2016-09-12 12:01:05 +0100 | [diff] [blame] | 2572 | |
Jon Hunter | f58d4e5 | 2016-09-12 12:01:08 +0100 | [diff] [blame] | 2573 | parent = genpd_get_from_provider(parent_spec); |
Jon Hunter | 19efa5f | 2016-09-12 12:01:11 +0100 | [diff] [blame] | 2574 | if (IS_ERR(parent)) { |
| 2575 | ret = PTR_ERR(parent); |
| 2576 | goto out; |
| 2577 | } |
Jon Hunter | ec69572 | 2016-09-12 12:01:05 +0100 | [diff] [blame] | 2578 | |
Jon Hunter | f58d4e5 | 2016-09-12 12:01:08 +0100 | [diff] [blame] | 2579 | subdomain = genpd_get_from_provider(subdomain_spec); |
Jon Hunter | 19efa5f | 2016-09-12 12:01:11 +0100 | [diff] [blame] | 2580 | if (IS_ERR(subdomain)) { |
| 2581 | ret = PTR_ERR(subdomain); |
| 2582 | goto out; |
| 2583 | } |
Jon Hunter | ec69572 | 2016-09-12 12:01:05 +0100 | [diff] [blame] | 2584 | |
Jon Hunter | 19efa5f | 2016-09-12 12:01:11 +0100 | [diff] [blame] | 2585 | ret = genpd_add_subdomain(parent, subdomain); |
| 2586 | |
| 2587 | out: |
| 2588 | mutex_unlock(&gpd_list_lock); |
| 2589 | |
Dmitry Osipenko | 18027d6 | 2021-01-21 00:12:31 +0300 | [diff] [blame] | 2590 | return ret == -ENOENT ? -EPROBE_DEFER : ret; |
Jon Hunter | ec69572 | 2016-09-12 12:01:05 +0100 | [diff] [blame] | 2591 | } |
| 2592 | EXPORT_SYMBOL_GPL(of_genpd_add_subdomain); |
| 2593 | |
| 2594 | /** |
Ulf Hansson | dedd149 | 2019-12-30 13:59:30 +0100 | [diff] [blame] | 2595 | * of_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. |
| 2596 | * @parent_spec: OF phandle args to use for parent PM domain look-up |
| 2597 | * @subdomain_spec: OF phandle args to use for subdomain look-up |
| 2598 | * |
| 2599 | * Looks-up a parent PM domain and subdomain based upon phandle args |
| 2600 | * provided and removes the subdomain from the parent PM domain. Returns a |
| 2601 | * negative error code on failure. |
| 2602 | */ |
| 2603 | int of_genpd_remove_subdomain(struct of_phandle_args *parent_spec, |
| 2604 | struct of_phandle_args *subdomain_spec) |
| 2605 | { |
| 2606 | struct generic_pm_domain *parent, *subdomain; |
| 2607 | int ret; |
| 2608 | |
| 2609 | mutex_lock(&gpd_list_lock); |
| 2610 | |
| 2611 | parent = genpd_get_from_provider(parent_spec); |
| 2612 | if (IS_ERR(parent)) { |
| 2613 | ret = PTR_ERR(parent); |
| 2614 | goto out; |
| 2615 | } |
| 2616 | |
| 2617 | subdomain = genpd_get_from_provider(subdomain_spec); |
| 2618 | if (IS_ERR(subdomain)) { |
| 2619 | ret = PTR_ERR(subdomain); |
| 2620 | goto out; |
| 2621 | } |
| 2622 | |
| 2623 | ret = pm_genpd_remove_subdomain(parent, subdomain); |
| 2624 | |
| 2625 | out: |
| 2626 | mutex_unlock(&gpd_list_lock); |
| 2627 | |
| 2628 | return ret; |
| 2629 | } |
| 2630 | EXPORT_SYMBOL_GPL(of_genpd_remove_subdomain); |
| 2631 | |
| 2632 | /** |
Jon Hunter | 1792655 | 2016-09-12 12:01:14 +0100 | [diff] [blame] | 2633 | * of_genpd_remove_last - Remove the last PM domain registered for a provider |
Yang Yingliang | 763663c | 2021-05-12 15:25:15 +0800 | [diff] [blame] | 2634 | * @np: Pointer to device node associated with provider |
Jon Hunter | 1792655 | 2016-09-12 12:01:14 +0100 | [diff] [blame] | 2635 | * |
| 2636 | * Find the last PM domain that was added by a particular provider and |
| 2637 | * remove this PM domain from the list of PM domains. The provider is |
| 2638 | * identified by the 'provider' device structure that is passed. The PM |
| 2639 | * domain will only be removed, if the provider associated with domain |
| 2640 | * has been removed. |
| 2641 | * |
| 2642 | * Returns a valid pointer to struct generic_pm_domain on success or |
| 2643 | * ERR_PTR() on failure. |
| 2644 | */ |
| 2645 | struct generic_pm_domain *of_genpd_remove_last(struct device_node *np) |
| 2646 | { |
Krzysztof Kozlowski | a7e2d1b | 2017-06-28 16:56:20 +0200 | [diff] [blame] | 2647 | struct generic_pm_domain *gpd, *tmp, *genpd = ERR_PTR(-ENOENT); |
Jon Hunter | 1792655 | 2016-09-12 12:01:14 +0100 | [diff] [blame] | 2648 | int ret; |
| 2649 | |
| 2650 | if (IS_ERR_OR_NULL(np)) |
| 2651 | return ERR_PTR(-EINVAL); |
| 2652 | |
| 2653 | mutex_lock(&gpd_list_lock); |
Krzysztof Kozlowski | a7e2d1b | 2017-06-28 16:56:20 +0200 | [diff] [blame] | 2654 | list_for_each_entry_safe(gpd, tmp, &gpd_list, gpd_list_node) { |
Jon Hunter | 1792655 | 2016-09-12 12:01:14 +0100 | [diff] [blame] | 2655 | if (gpd->provider == &np->fwnode) { |
| 2656 | ret = genpd_remove(gpd); |
| 2657 | genpd = ret ? ERR_PTR(ret) : gpd; |
| 2658 | break; |
| 2659 | } |
| 2660 | } |
| 2661 | mutex_unlock(&gpd_list_lock); |
| 2662 | |
| 2663 | return genpd; |
| 2664 | } |
| 2665 | EXPORT_SYMBOL_GPL(of_genpd_remove_last); |
| 2666 | |
Ulf Hansson | 3c095f3 | 2018-05-31 12:59:58 +0200 | [diff] [blame] | 2667 | static void genpd_release_dev(struct device *dev) |
| 2668 | { |
Ulf Hansson | e8b04de | 2019-04-18 12:27:56 +0200 | [diff] [blame] | 2669 | of_node_put(dev->of_node); |
Ulf Hansson | 3c095f3 | 2018-05-31 12:59:58 +0200 | [diff] [blame] | 2670 | kfree(dev); |
| 2671 | } |
| 2672 | |
| 2673 | static struct bus_type genpd_bus_type = { |
| 2674 | .name = "genpd", |
| 2675 | }; |
| 2676 | |
Jon Hunter | 1792655 | 2016-09-12 12:01:14 +0100 | [diff] [blame] | 2677 | /** |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2678 | * genpd_dev_pm_detach - Detach a device from its PM domain. |
Jon Hunter | 8bb6944 | 2015-08-27 10:17:00 +0100 | [diff] [blame] | 2679 | * @dev: Device to detach. |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2680 | * @power_off: Currently not used |
| 2681 | * |
| 2682 | * Try to locate a corresponding generic PM domain, which the device was |
| 2683 | * attached to previously. If such is found, the device is detached from it. |
| 2684 | */ |
| 2685 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) |
| 2686 | { |
Russell King | 446d999c | 2015-03-20 17:20:33 +0000 | [diff] [blame] | 2687 | struct generic_pm_domain *pd; |
Geert Uytterhoeven | 93af5e9 | 2015-06-26 11:14:14 +0200 | [diff] [blame] | 2688 | unsigned int i; |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2689 | int ret = 0; |
| 2690 | |
Ulf Hansson | 85168d5 | 2016-09-21 15:38:50 +0200 | [diff] [blame] | 2691 | pd = dev_to_genpd(dev); |
| 2692 | if (IS_ERR(pd)) |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2693 | return; |
| 2694 | |
| 2695 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); |
| 2696 | |
Rajendra Nayak | c016baf | 2021-08-12 16:57:21 +0530 | [diff] [blame] | 2697 | /* Drop the default performance state */ |
| 2698 | if (dev_gpd_data(dev)->default_pstate) { |
| 2699 | dev_pm_genpd_set_performance_state(dev, 0); |
| 2700 | dev_gpd_data(dev)->default_pstate = 0; |
| 2701 | } |
| 2702 | |
Geert Uytterhoeven | 93af5e9 | 2015-06-26 11:14:14 +0200 | [diff] [blame] | 2703 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
Ulf Hansson | 85168d5 | 2016-09-21 15:38:50 +0200 | [diff] [blame] | 2704 | ret = genpd_remove_device(pd, dev); |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2705 | if (ret != -EAGAIN) |
| 2706 | break; |
Geert Uytterhoeven | 93af5e9 | 2015-06-26 11:14:14 +0200 | [diff] [blame] | 2707 | |
| 2708 | mdelay(i); |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2709 | cond_resched(); |
| 2710 | } |
| 2711 | |
| 2712 | if (ret < 0) { |
| 2713 | dev_err(dev, "failed to remove from PM domain %s: %d", |
| 2714 | pd->name, ret); |
| 2715 | return; |
| 2716 | } |
| 2717 | |
| 2718 | /* Check if PM domain can be powered off after removing this device. */ |
| 2719 | genpd_queue_power_off_work(pd); |
Ulf Hansson | 3c095f3 | 2018-05-31 12:59:58 +0200 | [diff] [blame] | 2720 | |
| 2721 | /* Unregister the device if it was created by genpd. */ |
| 2722 | if (dev->bus == &genpd_bus_type) |
| 2723 | device_unregister(dev); |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2724 | } |
| 2725 | |
Russell King | 632f7ce | 2015-03-20 15:55:12 +0100 | [diff] [blame] | 2726 | static void genpd_dev_pm_sync(struct device *dev) |
| 2727 | { |
| 2728 | struct generic_pm_domain *pd; |
| 2729 | |
| 2730 | pd = dev_to_genpd(dev); |
| 2731 | if (IS_ERR(pd)) |
| 2732 | return; |
| 2733 | |
| 2734 | genpd_queue_power_off_work(pd); |
| 2735 | } |
| 2736 | |
Ulf Hansson | 51dcf74 | 2019-04-25 11:04:10 +0200 | [diff] [blame] | 2737 | static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev, |
| 2738 | unsigned int index, bool power_on) |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2739 | { |
| 2740 | struct of_phandle_args pd_args; |
| 2741 | struct generic_pm_domain *pd; |
Rajendra Nayak | c016baf | 2021-08-12 16:57:21 +0530 | [diff] [blame] | 2742 | int pstate; |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2743 | int ret; |
| 2744 | |
Ulf Hansson | e8b04de | 2019-04-18 12:27:56 +0200 | [diff] [blame] | 2745 | ret = of_parse_phandle_with_args(dev->of_node, "power-domains", |
Ulf Hansson | 8cb1cbd6 | 2018-05-31 12:59:57 +0200 | [diff] [blame] | 2746 | "#power-domain-cells", index, &pd_args); |
Geert Uytterhoeven | 001d50c | 2017-11-30 12:54:28 +0100 | [diff] [blame] | 2747 | if (ret < 0) |
Ulf Hansson | bcd931f | 2018-05-31 12:59:56 +0200 | [diff] [blame] | 2748 | return ret; |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2749 | |
Jon Hunter | 19efa5f | 2016-09-12 12:01:11 +0100 | [diff] [blame] | 2750 | mutex_lock(&gpd_list_lock); |
Jon Hunter | f58d4e5 | 2016-09-12 12:01:08 +0100 | [diff] [blame] | 2751 | pd = genpd_get_from_provider(&pd_args); |
Eric Anholt | 265e2cf | 2015-12-01 09:39:31 -0800 | [diff] [blame] | 2752 | of_node_put(pd_args.np); |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2753 | if (IS_ERR(pd)) { |
Jon Hunter | 19efa5f | 2016-09-12 12:01:11 +0100 | [diff] [blame] | 2754 | mutex_unlock(&gpd_list_lock); |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2755 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", |
| 2756 | __func__, PTR_ERR(pd)); |
Saravana Kannan | e20813d | 2022-08-19 15:16:13 -0700 | [diff] [blame] | 2757 | return driver_deferred_probe_check_state(base_dev); |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2758 | } |
| 2759 | |
| 2760 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); |
| 2761 | |
Ulf Hansson | f9ccd7c | 2019-04-25 11:04:13 +0200 | [diff] [blame] | 2762 | ret = genpd_add_device(pd, dev, base_dev); |
Jon Hunter | 19efa5f | 2016-09-12 12:01:11 +0100 | [diff] [blame] | 2763 | mutex_unlock(&gpd_list_lock); |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2764 | |
Ahmad Fatoum | 9a6582b | 2022-02-23 09:03:23 +0100 | [diff] [blame] | 2765 | if (ret < 0) |
| 2766 | return dev_err_probe(dev, ret, "failed to add to PM domain %s\n", pd->name); |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2767 | |
| 2768 | dev->pm_domain->detach = genpd_dev_pm_detach; |
Russell King | 632f7ce | 2015-03-20 15:55:12 +0100 | [diff] [blame] | 2769 | dev->pm_domain->sync = genpd_dev_pm_sync; |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2770 | |
Rajendra Nayak | c016baf | 2021-08-12 16:57:21 +0530 | [diff] [blame] | 2771 | /* Set the default performance state */ |
| 2772 | pstate = of_get_required_opp_performance_state(dev->of_node, index); |
Geert Uytterhoeven | 6561641 | 2021-08-24 17:23:38 +0200 | [diff] [blame] | 2773 | if (pstate < 0 && pstate != -ENODEV && pstate != -EOPNOTSUPP) { |
Rajendra Nayak | c016baf | 2021-08-12 16:57:21 +0530 | [diff] [blame] | 2774 | ret = pstate; |
| 2775 | goto err; |
| 2776 | } else if (pstate > 0) { |
| 2777 | ret = dev_pm_genpd_set_performance_state(dev, pstate); |
| 2778 | if (ret) |
| 2779 | goto err; |
| 2780 | dev_gpd_data(dev)->default_pstate = pstate; |
| 2781 | } |
Abel Vesa | ae8ac19 | 2022-11-15 23:25:43 +0200 | [diff] [blame] | 2782 | |
| 2783 | if (power_on) { |
| 2784 | genpd_lock(pd); |
| 2785 | ret = genpd_power_on(pd, 0); |
| 2786 | genpd_unlock(pd); |
| 2787 | } |
| 2788 | |
| 2789 | if (ret) { |
| 2790 | /* Drop the default performance state */ |
| 2791 | if (dev_gpd_data(dev)->default_pstate) { |
| 2792 | dev_pm_genpd_set_performance_state(dev, 0); |
| 2793 | dev_gpd_data(dev)->default_pstate = 0; |
| 2794 | } |
| 2795 | |
| 2796 | genpd_remove_device(pd, dev); |
| 2797 | return -EPROBE_DEFER; |
| 2798 | } |
| 2799 | |
Rajendra Nayak | c016baf | 2021-08-12 16:57:21 +0530 | [diff] [blame] | 2800 | return 1; |
| 2801 | |
| 2802 | err: |
| 2803 | dev_err(dev, "failed to set required performance state for power-domain %s: %d\n", |
| 2804 | pd->name, ret); |
| 2805 | genpd_remove_device(pd, dev); |
| 2806 | return ret; |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2807 | } |
Ulf Hansson | 8cb1cbd6 | 2018-05-31 12:59:57 +0200 | [diff] [blame] | 2808 | |
| 2809 | /** |
| 2810 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. |
| 2811 | * @dev: Device to attach. |
| 2812 | * |
| 2813 | * Parse device's OF node to find a PM domain specifier. If such is found, |
| 2814 | * attaches the device to retrieved pm_domain ops. |
| 2815 | * |
| 2816 | * Returns 1 on successfully attached PM domain, 0 when the device don't need a |
| 2817 | * PM domain or when multiple power-domains exists for it, else a negative error |
| 2818 | * code. Note that if a power-domain exists for the device, but it cannot be |
| 2819 | * found or turned on, then return -EPROBE_DEFER to ensure that the device is |
| 2820 | * not probed and to re-try again later. |
| 2821 | */ |
| 2822 | int genpd_dev_pm_attach(struct device *dev) |
| 2823 | { |
| 2824 | if (!dev->of_node) |
| 2825 | return 0; |
| 2826 | |
| 2827 | /* |
| 2828 | * Devices with multiple PM domains must be attached separately, as we |
| 2829 | * can only attach one PM domain per device. |
| 2830 | */ |
| 2831 | if (of_count_phandle_with_args(dev->of_node, "power-domains", |
| 2832 | "#power-domain-cells") != 1) |
| 2833 | return 0; |
| 2834 | |
Ulf Hansson | 51dcf74 | 2019-04-25 11:04:10 +0200 | [diff] [blame] | 2835 | return __genpd_dev_pm_attach(dev, dev, 0, true); |
Ulf Hansson | 8cb1cbd6 | 2018-05-31 12:59:57 +0200 | [diff] [blame] | 2836 | } |
Tomasz Figa | aa42240 | 2014-09-19 20:27:36 +0200 | [diff] [blame] | 2837 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); |
Lina Iyer | 30f60428 | 2016-10-14 10:47:51 -0700 | [diff] [blame] | 2838 | |
Ulf Hansson | 3c095f3 | 2018-05-31 12:59:58 +0200 | [diff] [blame] | 2839 | /** |
| 2840 | * genpd_dev_pm_attach_by_id - Associate a device with one of its PM domains. |
| 2841 | * @dev: The device used to lookup the PM domain. |
| 2842 | * @index: The index of the PM domain. |
| 2843 | * |
| 2844 | * Parse device's OF node to find a PM domain specifier at the provided @index. |
| 2845 | * If such is found, creates a virtual device and attaches it to the retrieved |
| 2846 | * pm_domain ops. To deal with detaching of the virtual device, the ->detach() |
| 2847 | * callback in the struct dev_pm_domain are assigned to genpd_dev_pm_detach(). |
| 2848 | * |
| 2849 | * Returns the created virtual device if successfully attached PM domain, NULL |
| 2850 | * when the device don't need a PM domain, else an ERR_PTR() in case of |
| 2851 | * failures. If a power-domain exists for the device, but cannot be found or |
| 2852 | * turned on, then ERR_PTR(-EPROBE_DEFER) is returned to ensure that the device |
| 2853 | * is not probed and to re-try again later. |
| 2854 | */ |
| 2855 | struct device *genpd_dev_pm_attach_by_id(struct device *dev, |
| 2856 | unsigned int index) |
| 2857 | { |
Viresh Kumar | 560928b | 2018-10-25 09:07:38 +0530 | [diff] [blame] | 2858 | struct device *virt_dev; |
Ulf Hansson | 3c095f3 | 2018-05-31 12:59:58 +0200 | [diff] [blame] | 2859 | int num_domains; |
| 2860 | int ret; |
| 2861 | |
| 2862 | if (!dev->of_node) |
| 2863 | return NULL; |
| 2864 | |
Ulf Hansson | 3ccf3f0 | 2019-04-18 12:27:57 +0200 | [diff] [blame] | 2865 | /* Verify that the index is within a valid range. */ |
Ulf Hansson | 3c095f3 | 2018-05-31 12:59:58 +0200 | [diff] [blame] | 2866 | num_domains = of_count_phandle_with_args(dev->of_node, "power-domains", |
| 2867 | "#power-domain-cells"); |
Ulf Hansson | 3ccf3f0 | 2019-04-18 12:27:57 +0200 | [diff] [blame] | 2868 | if (index >= num_domains) |
Ulf Hansson | 3c095f3 | 2018-05-31 12:59:58 +0200 | [diff] [blame] | 2869 | return NULL; |
| 2870 | |
| 2871 | /* Allocate and register device on the genpd bus. */ |
Viresh Kumar | 560928b | 2018-10-25 09:07:38 +0530 | [diff] [blame] | 2872 | virt_dev = kzalloc(sizeof(*virt_dev), GFP_KERNEL); |
| 2873 | if (!virt_dev) |
Ulf Hansson | 3c095f3 | 2018-05-31 12:59:58 +0200 | [diff] [blame] | 2874 | return ERR_PTR(-ENOMEM); |
| 2875 | |
Viresh Kumar | 560928b | 2018-10-25 09:07:38 +0530 | [diff] [blame] | 2876 | dev_set_name(virt_dev, "genpd:%u:%s", index, dev_name(dev)); |
| 2877 | virt_dev->bus = &genpd_bus_type; |
| 2878 | virt_dev->release = genpd_release_dev; |
Ulf Hansson | e8b04de | 2019-04-18 12:27:56 +0200 | [diff] [blame] | 2879 | virt_dev->of_node = of_node_get(dev->of_node); |
Ulf Hansson | 3c095f3 | 2018-05-31 12:59:58 +0200 | [diff] [blame] | 2880 | |
Viresh Kumar | 560928b | 2018-10-25 09:07:38 +0530 | [diff] [blame] | 2881 | ret = device_register(virt_dev); |
Ulf Hansson | 3c095f3 | 2018-05-31 12:59:58 +0200 | [diff] [blame] | 2882 | if (ret) { |
Ulf Hansson | 71b7769 | 2019-04-18 12:27:55 +0200 | [diff] [blame] | 2883 | put_device(virt_dev); |
Ulf Hansson | 3c095f3 | 2018-05-31 12:59:58 +0200 | [diff] [blame] | 2884 | return ERR_PTR(ret); |
| 2885 | } |
| 2886 | |
| 2887 | /* Try to attach the device to the PM domain at the specified index. */ |
Ulf Hansson | 51dcf74 | 2019-04-25 11:04:10 +0200 | [diff] [blame] | 2888 | ret = __genpd_dev_pm_attach(virt_dev, dev, index, false); |
Ulf Hansson | 3c095f3 | 2018-05-31 12:59:58 +0200 | [diff] [blame] | 2889 | if (ret < 1) { |
Viresh Kumar | 560928b | 2018-10-25 09:07:38 +0530 | [diff] [blame] | 2890 | device_unregister(virt_dev); |
Ulf Hansson | 3c095f3 | 2018-05-31 12:59:58 +0200 | [diff] [blame] | 2891 | return ret ? ERR_PTR(ret) : NULL; |
| 2892 | } |
| 2893 | |
Viresh Kumar | 560928b | 2018-10-25 09:07:38 +0530 | [diff] [blame] | 2894 | pm_runtime_enable(virt_dev); |
| 2895 | genpd_queue_power_off_work(dev_to_genpd(virt_dev)); |
Ulf Hansson | 3c095f3 | 2018-05-31 12:59:58 +0200 | [diff] [blame] | 2896 | |
Viresh Kumar | 560928b | 2018-10-25 09:07:38 +0530 | [diff] [blame] | 2897 | return virt_dev; |
Ulf Hansson | 3c095f3 | 2018-05-31 12:59:58 +0200 | [diff] [blame] | 2898 | } |
| 2899 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach_by_id); |
| 2900 | |
Ulf Hansson | 5d6be70 | 2018-06-29 13:04:31 +0200 | [diff] [blame] | 2901 | /** |
| 2902 | * genpd_dev_pm_attach_by_name - Associate a device with one of its PM domains. |
| 2903 | * @dev: The device used to lookup the PM domain. |
| 2904 | * @name: The name of the PM domain. |
| 2905 | * |
| 2906 | * Parse device's OF node to find a PM domain specifier using the |
| 2907 | * power-domain-names DT property. For further description see |
| 2908 | * genpd_dev_pm_attach_by_id(). |
| 2909 | */ |
Douglas Anderson | 7416f1f | 2019-02-14 10:12:48 -0800 | [diff] [blame] | 2910 | struct device *genpd_dev_pm_attach_by_name(struct device *dev, const char *name) |
Ulf Hansson | 5d6be70 | 2018-06-29 13:04:31 +0200 | [diff] [blame] | 2911 | { |
| 2912 | int index; |
| 2913 | |
| 2914 | if (!dev->of_node) |
| 2915 | return NULL; |
| 2916 | |
| 2917 | index = of_property_match_string(dev->of_node, "power-domain-names", |
| 2918 | name); |
| 2919 | if (index < 0) |
| 2920 | return NULL; |
| 2921 | |
| 2922 | return genpd_dev_pm_attach_by_id(dev, index); |
| 2923 | } |
| 2924 | |
Lina Iyer | 30f60428 | 2016-10-14 10:47:51 -0700 | [diff] [blame] | 2925 | static const struct of_device_id idle_state_match[] = { |
Lina Iyer | 598da54 | 2016-11-03 14:54:35 -0700 | [diff] [blame] | 2926 | { .compatible = "domain-idle-state", }, |
Lina Iyer | 30f60428 | 2016-10-14 10:47:51 -0700 | [diff] [blame] | 2927 | { } |
| 2928 | }; |
| 2929 | |
| 2930 | static int genpd_parse_state(struct genpd_power_state *genpd_state, |
| 2931 | struct device_node *state_node) |
| 2932 | { |
| 2933 | int err; |
| 2934 | u32 residency; |
| 2935 | u32 entry_latency, exit_latency; |
Lina Iyer | 30f60428 | 2016-10-14 10:47:51 -0700 | [diff] [blame] | 2936 | |
| 2937 | err = of_property_read_u32(state_node, "entry-latency-us", |
| 2938 | &entry_latency); |
| 2939 | if (err) { |
Rob Herring | ea11e94 | 2017-07-18 16:42:50 -0500 | [diff] [blame] | 2940 | pr_debug(" * %pOF missing entry-latency-us property\n", |
Joe Perches | 7a5bd12 | 2019-03-04 09:14:38 -0800 | [diff] [blame] | 2941 | state_node); |
Lina Iyer | 30f60428 | 2016-10-14 10:47:51 -0700 | [diff] [blame] | 2942 | return -EINVAL; |
| 2943 | } |
| 2944 | |
| 2945 | err = of_property_read_u32(state_node, "exit-latency-us", |
| 2946 | &exit_latency); |
| 2947 | if (err) { |
Rob Herring | ea11e94 | 2017-07-18 16:42:50 -0500 | [diff] [blame] | 2948 | pr_debug(" * %pOF missing exit-latency-us property\n", |
Joe Perches | 7a5bd12 | 2019-03-04 09:14:38 -0800 | [diff] [blame] | 2949 | state_node); |
Lina Iyer | 30f60428 | 2016-10-14 10:47:51 -0700 | [diff] [blame] | 2950 | return -EINVAL; |
| 2951 | } |
| 2952 | |
| 2953 | err = of_property_read_u32(state_node, "min-residency-us", &residency); |
| 2954 | if (!err) |
Nikita Zhandarovich | e5d1c87 | 2023-04-18 06:07:43 -0700 | [diff] [blame] | 2955 | genpd_state->residency_ns = 1000LL * residency; |
Lina Iyer | 30f60428 | 2016-10-14 10:47:51 -0700 | [diff] [blame] | 2956 | |
Nikita Zhandarovich | e5d1c87 | 2023-04-18 06:07:43 -0700 | [diff] [blame] | 2957 | genpd_state->power_on_latency_ns = 1000LL * exit_latency; |
| 2958 | genpd_state->power_off_latency_ns = 1000LL * entry_latency; |
Lina Iyer | 0c9b694 | 2016-10-14 10:47:52 -0700 | [diff] [blame] | 2959 | genpd_state->fwnode = &state_node->fwnode; |
Lina Iyer | 30f60428 | 2016-10-14 10:47:51 -0700 | [diff] [blame] | 2960 | |
| 2961 | return 0; |
| 2962 | } |
| 2963 | |
Ulf Hansson | a3381e3 | 2018-01-23 21:43:08 +0100 | [diff] [blame] | 2964 | static int genpd_iterate_idle_states(struct device_node *dn, |
| 2965 | struct genpd_power_state *states) |
| 2966 | { |
| 2967 | int ret; |
| 2968 | struct of_phandle_iterator it; |
| 2969 | struct device_node *np; |
| 2970 | int i = 0; |
| 2971 | |
| 2972 | ret = of_count_phandle_with_args(dn, "domain-idle-states", NULL); |
| 2973 | if (ret <= 0) |
Ulf Hansson | 56cb268 | 2020-03-10 11:40:23 +0100 | [diff] [blame] | 2974 | return ret == -ENOENT ? 0 : ret; |
Ulf Hansson | a3381e3 | 2018-01-23 21:43:08 +0100 | [diff] [blame] | 2975 | |
| 2976 | /* Loop over the phandles until all the requested entry is found */ |
| 2977 | of_for_each_phandle(&it, ret, dn, "domain-idle-states", NULL, 0) { |
| 2978 | np = it.node; |
| 2979 | if (!of_match_node(idle_state_match, np)) |
| 2980 | continue; |
Sudeep Holla | e0c57a5 | 2022-10-25 13:34:32 +0100 | [diff] [blame] | 2981 | |
| 2982 | if (!of_device_is_available(np)) |
| 2983 | continue; |
| 2984 | |
Ulf Hansson | a3381e3 | 2018-01-23 21:43:08 +0100 | [diff] [blame] | 2985 | if (states) { |
| 2986 | ret = genpd_parse_state(&states[i], np); |
| 2987 | if (ret) { |
| 2988 | pr_err("Parsing idle state node %pOF failed with err %d\n", |
| 2989 | np, ret); |
| 2990 | of_node_put(np); |
| 2991 | return ret; |
| 2992 | } |
| 2993 | } |
| 2994 | i++; |
| 2995 | } |
| 2996 | |
| 2997 | return i; |
| 2998 | } |
| 2999 | |
Lina Iyer | 30f60428 | 2016-10-14 10:47:51 -0700 | [diff] [blame] | 3000 | /** |
| 3001 | * of_genpd_parse_idle_states: Return array of idle states for the genpd. |
| 3002 | * |
| 3003 | * @dn: The genpd device node |
| 3004 | * @states: The pointer to which the state array will be saved. |
| 3005 | * @n: The count of elements in the array returned from this function. |
| 3006 | * |
| 3007 | * Returns the device states parsed from the OF node. The memory for the states |
| 3008 | * is allocated by this function and is the responsibility of the caller to |
Ulf Hansson | 2c36168 | 2018-10-03 16:38:14 +0200 | [diff] [blame] | 3009 | * free the memory after use. If any or zero compatible domain idle states is |
| 3010 | * found it returns 0 and in case of errors, a negative error code is returned. |
Lina Iyer | 30f60428 | 2016-10-14 10:47:51 -0700 | [diff] [blame] | 3011 | */ |
| 3012 | int of_genpd_parse_idle_states(struct device_node *dn, |
| 3013 | struct genpd_power_state **states, int *n) |
| 3014 | { |
| 3015 | struct genpd_power_state *st; |
Ulf Hansson | a3381e3 | 2018-01-23 21:43:08 +0100 | [diff] [blame] | 3016 | int ret; |
Lina Iyer | 30f60428 | 2016-10-14 10:47:51 -0700 | [diff] [blame] | 3017 | |
Ulf Hansson | a3381e3 | 2018-01-23 21:43:08 +0100 | [diff] [blame] | 3018 | ret = genpd_iterate_idle_states(dn, NULL); |
Ulf Hansson | 2c36168 | 2018-10-03 16:38:14 +0200 | [diff] [blame] | 3019 | if (ret < 0) |
| 3020 | return ret; |
| 3021 | |
| 3022 | if (!ret) { |
| 3023 | *states = NULL; |
| 3024 | *n = 0; |
| 3025 | return 0; |
| 3026 | } |
Lina Iyer | 30f60428 | 2016-10-14 10:47:51 -0700 | [diff] [blame] | 3027 | |
Ulf Hansson | a3381e3 | 2018-01-23 21:43:08 +0100 | [diff] [blame] | 3028 | st = kcalloc(ret, sizeof(*st), GFP_KERNEL); |
Lina Iyer | 30f60428 | 2016-10-14 10:47:51 -0700 | [diff] [blame] | 3029 | if (!st) |
| 3030 | return -ENOMEM; |
| 3031 | |
Ulf Hansson | a3381e3 | 2018-01-23 21:43:08 +0100 | [diff] [blame] | 3032 | ret = genpd_iterate_idle_states(dn, st); |
| 3033 | if (ret <= 0) { |
| 3034 | kfree(st); |
| 3035 | return ret < 0 ? ret : -EINVAL; |
Lina Iyer | 30f60428 | 2016-10-14 10:47:51 -0700 | [diff] [blame] | 3036 | } |
| 3037 | |
Ulf Hansson | a3381e3 | 2018-01-23 21:43:08 +0100 | [diff] [blame] | 3038 | *states = st; |
| 3039 | *n = ret; |
Lina Iyer | 30f60428 | 2016-10-14 10:47:51 -0700 | [diff] [blame] | 3040 | |
| 3041 | return 0; |
| 3042 | } |
| 3043 | EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states); |
| 3044 | |
Viresh Kumar | 6e41766 | 2017-11-29 15:21:51 +0530 | [diff] [blame] | 3045 | /** |
Viresh Kumar | e38f89d | 2018-06-13 20:22:04 +0530 | [diff] [blame] | 3046 | * pm_genpd_opp_to_performance_state - Gets performance state of the genpd from its OPP node. |
| 3047 | * |
| 3048 | * @genpd_dev: Genpd's device for which the performance-state needs to be found. |
| 3049 | * @opp: struct dev_pm_opp of the OPP for which we need to find performance |
| 3050 | * state. |
| 3051 | * |
| 3052 | * Returns performance state encoded in the OPP of the genpd. This calls |
| 3053 | * platform specific genpd->opp_to_performance_state() callback to translate |
| 3054 | * power domain OPP to performance state. |
| 3055 | * |
| 3056 | * Returns performance state on success and 0 on failure. |
| 3057 | */ |
| 3058 | unsigned int pm_genpd_opp_to_performance_state(struct device *genpd_dev, |
| 3059 | struct dev_pm_opp *opp) |
| 3060 | { |
| 3061 | struct generic_pm_domain *genpd = NULL; |
| 3062 | int state; |
| 3063 | |
| 3064 | genpd = container_of(genpd_dev, struct generic_pm_domain, dev); |
| 3065 | |
| 3066 | if (unlikely(!genpd->opp_to_performance_state)) |
| 3067 | return 0; |
| 3068 | |
| 3069 | genpd_lock(genpd); |
| 3070 | state = genpd->opp_to_performance_state(genpd, opp); |
| 3071 | genpd_unlock(genpd); |
| 3072 | |
| 3073 | return state; |
| 3074 | } |
| 3075 | EXPORT_SYMBOL_GPL(pm_genpd_opp_to_performance_state); |
| 3076 | |
Ulf Hansson | 3c095f3 | 2018-05-31 12:59:58 +0200 | [diff] [blame] | 3077 | static int __init genpd_bus_init(void) |
| 3078 | { |
| 3079 | return bus_register(&genpd_bus_type); |
| 3080 | } |
| 3081 | core_initcall(genpd_bus_init); |
| 3082 | |
Rafael J. Wysocki | d30d819 | 2014-11-27 22:38:05 +0100 | [diff] [blame] | 3083 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3084 | |
| 3085 | |
| 3086 | /*** debugfs support ***/ |
| 3087 | |
Jon Hunter | 8b0510b | 2016-08-11 11:40:05 +0100 | [diff] [blame] | 3088 | #ifdef CONFIG_DEBUG_FS |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3089 | /* |
| 3090 | * TODO: This function is a slightly modified version of rtpm_status_show |
Rafael J. Wysocki | d30d819 | 2014-11-27 22:38:05 +0100 | [diff] [blame] | 3091 | * from sysfs.c, so generalize it. |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3092 | */ |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3093 | static void rtpm_status_str(struct seq_file *s, struct device *dev) |
| 3094 | { |
| 3095 | static const char * const status_lookup[] = { |
| 3096 | [RPM_ACTIVE] = "active", |
| 3097 | [RPM_RESUMING] = "resuming", |
| 3098 | [RPM_SUSPENDED] = "suspended", |
| 3099 | [RPM_SUSPENDING] = "suspending" |
| 3100 | }; |
| 3101 | const char *p = ""; |
| 3102 | |
| 3103 | if (dev->power.runtime_error) |
| 3104 | p = "error"; |
| 3105 | else if (dev->power.disable_depth) |
| 3106 | p = "unsupported"; |
| 3107 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) |
| 3108 | p = status_lookup[dev->power.runtime_status]; |
| 3109 | else |
| 3110 | WARN_ON(1); |
| 3111 | |
Dmitry Osipenko | 45fbc46 | 2021-01-21 00:12:32 +0300 | [diff] [blame] | 3112 | seq_printf(s, "%-25s ", p); |
| 3113 | } |
| 3114 | |
| 3115 | static void perf_status_str(struct seq_file *s, struct device *dev) |
| 3116 | { |
| 3117 | struct generic_pm_domain_data *gpd_data; |
| 3118 | |
| 3119 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); |
| 3120 | seq_put_decimal_ull(s, "", gpd_data->performance_state); |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3121 | } |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3122 | |
Ulf Hansson | 9e9704e | 2017-10-06 09:02:06 +0200 | [diff] [blame] | 3123 | static int genpd_summary_one(struct seq_file *s, |
| 3124 | struct generic_pm_domain *genpd) |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3125 | { |
| 3126 | static const char * const status_lookup[] = { |
Ulf Hansson | 49f618e | 2020-09-24 13:04:47 +0200 | [diff] [blame] | 3127 | [GENPD_STATE_ON] = "on", |
| 3128 | [GENPD_STATE_OFF] = "off" |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3129 | }; |
| 3130 | struct pm_domain_data *pm_data; |
| 3131 | const char *kobj_path; |
| 3132 | struct gpd_link *link; |
Geert Uytterhoeven | 6954d43 | 2016-02-23 17:49:17 +0100 | [diff] [blame] | 3133 | char state[16]; |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3134 | int ret; |
| 3135 | |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 3136 | ret = genpd_lock_interruptible(genpd); |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3137 | if (ret) |
| 3138 | return -ERESTARTSYS; |
| 3139 | |
Kevin Hilman | 66a5ca4 | 2015-03-02 11:24:28 -0800 | [diff] [blame] | 3140 | if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3141 | goto exit; |
Ulf Hansson | 41e2c8e | 2017-03-20 11:19:20 +0100 | [diff] [blame] | 3142 | if (!genpd_status_on(genpd)) |
Geert Uytterhoeven | 0ba554e | 2016-02-23 17:49:18 +0100 | [diff] [blame] | 3143 | snprintf(state, sizeof(state), "%s-%u", |
Geert Uytterhoeven | 6954d43 | 2016-02-23 17:49:17 +0100 | [diff] [blame] | 3144 | status_lookup[genpd->status], genpd->state_idx); |
Axel Haslam | fc5cbf0 | 2016-02-15 11:10:51 +0100 | [diff] [blame] | 3145 | else |
Geert Uytterhoeven | 6954d43 | 2016-02-23 17:49:17 +0100 | [diff] [blame] | 3146 | snprintf(state, sizeof(state), "%s", |
| 3147 | status_lookup[genpd->status]); |
Dmitry Osipenko | 45fbc46 | 2021-01-21 00:12:32 +0300 | [diff] [blame] | 3148 | seq_printf(s, "%-30s %-50s %u", genpd->name, state, genpd->performance_state); |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3149 | |
| 3150 | /* |
| 3151 | * Modifications on the list require holding locks on both |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 3152 | * parent and child, so we are safe. |
Kevin Hilman | 66a5ca4 | 2015-03-02 11:24:28 -0800 | [diff] [blame] | 3153 | * Also genpd->name is immutable. |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3154 | */ |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 3155 | list_for_each_entry(link, &genpd->parent_links, parent_node) { |
Dmitry Osipenko | 45fbc46 | 2021-01-21 00:12:32 +0300 | [diff] [blame] | 3156 | if (list_is_first(&link->parent_node, &genpd->parent_links)) |
| 3157 | seq_printf(s, "\n%48s", " "); |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 3158 | seq_printf(s, "%s", link->child->name); |
| 3159 | if (!list_is_last(&link->parent_node, &genpd->parent_links)) |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3160 | seq_puts(s, ", "); |
| 3161 | } |
| 3162 | |
Kevin Hilman | 66a5ca4 | 2015-03-02 11:24:28 -0800 | [diff] [blame] | 3163 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
Lina Iyer | d716f47 | 2016-10-14 10:47:55 -0700 | [diff] [blame] | 3164 | kobj_path = kobject_get_path(&pm_data->dev->kobj, |
| 3165 | genpd_is_irq_safe(genpd) ? |
| 3166 | GFP_ATOMIC : GFP_KERNEL); |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3167 | if (kobj_path == NULL) |
| 3168 | continue; |
| 3169 | |
| 3170 | seq_printf(s, "\n %-50s ", kobj_path); |
| 3171 | rtpm_status_str(s, pm_data->dev); |
Dmitry Osipenko | 45fbc46 | 2021-01-21 00:12:32 +0300 | [diff] [blame] | 3172 | perf_status_str(s, pm_data->dev); |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3173 | kfree(kobj_path); |
| 3174 | } |
| 3175 | |
| 3176 | seq_puts(s, "\n"); |
| 3177 | exit: |
Lina Iyer | 35241d1 | 2016-10-14 10:47:54 -0700 | [diff] [blame] | 3178 | genpd_unlock(genpd); |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3179 | |
| 3180 | return 0; |
| 3181 | } |
| 3182 | |
Yangtao Li | d32dcc6 | 2018-12-15 03:45:26 -0500 | [diff] [blame] | 3183 | static int summary_show(struct seq_file *s, void *data) |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3184 | { |
Kevin Hilman | 66a5ca4 | 2015-03-02 11:24:28 -0800 | [diff] [blame] | 3185 | struct generic_pm_domain *genpd; |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3186 | int ret = 0; |
| 3187 | |
Dmitry Osipenko | 45fbc46 | 2021-01-21 00:12:32 +0300 | [diff] [blame] | 3188 | seq_puts(s, "domain status children performance\n"); |
Geert Uytterhoeven | 15dec67 | 2015-08-11 14:50:49 +0200 | [diff] [blame] | 3189 | seq_puts(s, " /device runtime status\n"); |
Dmitry Osipenko | 45fbc46 | 2021-01-21 00:12:32 +0300 | [diff] [blame] | 3190 | seq_puts(s, "----------------------------------------------------------------------------------------------\n"); |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3191 | |
| 3192 | ret = mutex_lock_interruptible(&gpd_list_lock); |
| 3193 | if (ret) |
| 3194 | return -ERESTARTSYS; |
| 3195 | |
Kevin Hilman | 66a5ca4 | 2015-03-02 11:24:28 -0800 | [diff] [blame] | 3196 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
Ulf Hansson | 9e9704e | 2017-10-06 09:02:06 +0200 | [diff] [blame] | 3197 | ret = genpd_summary_one(s, genpd); |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3198 | if (ret) |
| 3199 | break; |
| 3200 | } |
| 3201 | mutex_unlock(&gpd_list_lock); |
| 3202 | |
| 3203 | return ret; |
| 3204 | } |
| 3205 | |
Yangtao Li | d32dcc6 | 2018-12-15 03:45:26 -0500 | [diff] [blame] | 3206 | static int status_show(struct seq_file *s, void *data) |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3207 | { |
Thara Gopinath | b6a1d09 | 2017-07-14 13:10:16 -0400 | [diff] [blame] | 3208 | static const char * const status_lookup[] = { |
Ulf Hansson | 49f618e | 2020-09-24 13:04:47 +0200 | [diff] [blame] | 3209 | [GENPD_STATE_ON] = "on", |
| 3210 | [GENPD_STATE_OFF] = "off" |
Thara Gopinath | b6a1d09 | 2017-07-14 13:10:16 -0400 | [diff] [blame] | 3211 | }; |
| 3212 | |
| 3213 | struct generic_pm_domain *genpd = s->private; |
| 3214 | int ret = 0; |
| 3215 | |
| 3216 | ret = genpd_lock_interruptible(genpd); |
| 3217 | if (ret) |
| 3218 | return -ERESTARTSYS; |
| 3219 | |
| 3220 | if (WARN_ON_ONCE(genpd->status >= ARRAY_SIZE(status_lookup))) |
| 3221 | goto exit; |
| 3222 | |
Ulf Hansson | 49f618e | 2020-09-24 13:04:47 +0200 | [diff] [blame] | 3223 | if (genpd->status == GENPD_STATE_OFF) |
Thara Gopinath | b6a1d09 | 2017-07-14 13:10:16 -0400 | [diff] [blame] | 3224 | seq_printf(s, "%s-%u\n", status_lookup[genpd->status], |
| 3225 | genpd->state_idx); |
| 3226 | else |
| 3227 | seq_printf(s, "%s\n", status_lookup[genpd->status]); |
| 3228 | exit: |
| 3229 | genpd_unlock(genpd); |
| 3230 | return ret; |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3231 | } |
| 3232 | |
Yangtao Li | d32dcc6 | 2018-12-15 03:45:26 -0500 | [diff] [blame] | 3233 | static int sub_domains_show(struct seq_file *s, void *data) |
Thara Gopinath | b6a1d09 | 2017-07-14 13:10:16 -0400 | [diff] [blame] | 3234 | { |
| 3235 | struct generic_pm_domain *genpd = s->private; |
| 3236 | struct gpd_link *link; |
| 3237 | int ret = 0; |
| 3238 | |
| 3239 | ret = genpd_lock_interruptible(genpd); |
| 3240 | if (ret) |
| 3241 | return -ERESTARTSYS; |
| 3242 | |
Kees Cook | 8d87ae4 | 2020-07-08 16:32:13 -0700 | [diff] [blame] | 3243 | list_for_each_entry(link, &genpd->parent_links, parent_node) |
| 3244 | seq_printf(s, "%s\n", link->child->name); |
Thara Gopinath | b6a1d09 | 2017-07-14 13:10:16 -0400 | [diff] [blame] | 3245 | |
| 3246 | genpd_unlock(genpd); |
| 3247 | return ret; |
| 3248 | } |
| 3249 | |
Yangtao Li | d32dcc6 | 2018-12-15 03:45:26 -0500 | [diff] [blame] | 3250 | static int idle_states_show(struct seq_file *s, void *data) |
Thara Gopinath | b6a1d09 | 2017-07-14 13:10:16 -0400 | [diff] [blame] | 3251 | { |
| 3252 | struct generic_pm_domain *genpd = s->private; |
Ulf Hansson | bd40cbb | 2022-04-19 19:29:16 +0200 | [diff] [blame] | 3253 | u64 now, delta, idle_time = 0; |
Thara Gopinath | b6a1d09 | 2017-07-14 13:10:16 -0400 | [diff] [blame] | 3254 | unsigned int i; |
| 3255 | int ret = 0; |
| 3256 | |
| 3257 | ret = genpd_lock_interruptible(genpd); |
| 3258 | if (ret) |
| 3259 | return -ERESTARTSYS; |
| 3260 | |
Lina Iyer | c6a113b | 2020-10-15 14:47:22 -0600 | [diff] [blame] | 3261 | seq_puts(s, "State Time Spent(ms) Usage Rejected\n"); |
Thara Gopinath | b6a1d09 | 2017-07-14 13:10:16 -0400 | [diff] [blame] | 3262 | |
| 3263 | for (i = 0; i < genpd->state_count; i++) { |
Ulf Hansson | bd40cbb | 2022-04-19 19:29:16 +0200 | [diff] [blame] | 3264 | idle_time += genpd->states[i].idle_time; |
Thara Gopinath | b6a1d09 | 2017-07-14 13:10:16 -0400 | [diff] [blame] | 3265 | |
Ulf Hansson | bd40cbb | 2022-04-19 19:29:16 +0200 | [diff] [blame] | 3266 | if (genpd->status == GENPD_STATE_OFF && genpd->state_idx == i) { |
| 3267 | now = ktime_get_mono_fast_ns(); |
| 3268 | if (now > genpd->accounting_time) { |
| 3269 | delta = now - genpd->accounting_time; |
| 3270 | idle_time += delta; |
| 3271 | } |
| 3272 | } |
Thara Gopinath | b6a1d09 | 2017-07-14 13:10:16 -0400 | [diff] [blame] | 3273 | |
Ulf Hansson | bd40cbb | 2022-04-19 19:29:16 +0200 | [diff] [blame] | 3274 | do_div(idle_time, NSEC_PER_MSEC); |
| 3275 | seq_printf(s, "S%-13i %-14llu %-14llu %llu\n", i, idle_time, |
| 3276 | genpd->states[i].usage, genpd->states[i].rejected); |
Thara Gopinath | b6a1d09 | 2017-07-14 13:10:16 -0400 | [diff] [blame] | 3277 | } |
| 3278 | |
| 3279 | genpd_unlock(genpd); |
| 3280 | return ret; |
| 3281 | } |
| 3282 | |
Yangtao Li | d32dcc6 | 2018-12-15 03:45:26 -0500 | [diff] [blame] | 3283 | static int active_time_show(struct seq_file *s, void *data) |
Thara Gopinath | b6a1d09 | 2017-07-14 13:10:16 -0400 | [diff] [blame] | 3284 | { |
| 3285 | struct generic_pm_domain *genpd = s->private; |
Ulf Hansson | bd40cbb | 2022-04-19 19:29:16 +0200 | [diff] [blame] | 3286 | u64 now, on_time, delta = 0; |
Thara Gopinath | b6a1d09 | 2017-07-14 13:10:16 -0400 | [diff] [blame] | 3287 | int ret = 0; |
| 3288 | |
| 3289 | ret = genpd_lock_interruptible(genpd); |
| 3290 | if (ret) |
| 3291 | return -ERESTARTSYS; |
| 3292 | |
Ulf Hansson | bd40cbb | 2022-04-19 19:29:16 +0200 | [diff] [blame] | 3293 | if (genpd->status == GENPD_STATE_ON) { |
| 3294 | now = ktime_get_mono_fast_ns(); |
| 3295 | if (now > genpd->accounting_time) |
| 3296 | delta = now - genpd->accounting_time; |
| 3297 | } |
Thara Gopinath | b6a1d09 | 2017-07-14 13:10:16 -0400 | [diff] [blame] | 3298 | |
Ulf Hansson | bd40cbb | 2022-04-19 19:29:16 +0200 | [diff] [blame] | 3299 | on_time = genpd->on_time + delta; |
| 3300 | do_div(on_time, NSEC_PER_MSEC); |
| 3301 | seq_printf(s, "%llu ms\n", on_time); |
Thara Gopinath | b6a1d09 | 2017-07-14 13:10:16 -0400 | [diff] [blame] | 3302 | |
| 3303 | genpd_unlock(genpd); |
| 3304 | return ret; |
| 3305 | } |
| 3306 | |
Yangtao Li | d32dcc6 | 2018-12-15 03:45:26 -0500 | [diff] [blame] | 3307 | static int total_idle_time_show(struct seq_file *s, void *data) |
Thara Gopinath | b6a1d09 | 2017-07-14 13:10:16 -0400 | [diff] [blame] | 3308 | { |
| 3309 | struct generic_pm_domain *genpd = s->private; |
Ulf Hansson | bd40cbb | 2022-04-19 19:29:16 +0200 | [diff] [blame] | 3310 | u64 now, delta, total = 0; |
Thara Gopinath | b6a1d09 | 2017-07-14 13:10:16 -0400 | [diff] [blame] | 3311 | unsigned int i; |
| 3312 | int ret = 0; |
| 3313 | |
| 3314 | ret = genpd_lock_interruptible(genpd); |
| 3315 | if (ret) |
| 3316 | return -ERESTARTSYS; |
| 3317 | |
| 3318 | for (i = 0; i < genpd->state_count; i++) { |
Ulf Hansson | bd40cbb | 2022-04-19 19:29:16 +0200 | [diff] [blame] | 3319 | total += genpd->states[i].idle_time; |
Thara Gopinath | b6a1d09 | 2017-07-14 13:10:16 -0400 | [diff] [blame] | 3320 | |
Ulf Hansson | bd40cbb | 2022-04-19 19:29:16 +0200 | [diff] [blame] | 3321 | if (genpd->status == GENPD_STATE_OFF && genpd->state_idx == i) { |
| 3322 | now = ktime_get_mono_fast_ns(); |
| 3323 | if (now > genpd->accounting_time) { |
| 3324 | delta = now - genpd->accounting_time; |
| 3325 | total += delta; |
| 3326 | } |
| 3327 | } |
Thara Gopinath | b6a1d09 | 2017-07-14 13:10:16 -0400 | [diff] [blame] | 3328 | } |
Thara Gopinath | b6a1d09 | 2017-07-14 13:10:16 -0400 | [diff] [blame] | 3329 | |
Ulf Hansson | bd40cbb | 2022-04-19 19:29:16 +0200 | [diff] [blame] | 3330 | do_div(total, NSEC_PER_MSEC); |
| 3331 | seq_printf(s, "%llu ms\n", total); |
Thara Gopinath | b6a1d09 | 2017-07-14 13:10:16 -0400 | [diff] [blame] | 3332 | |
| 3333 | genpd_unlock(genpd); |
| 3334 | return ret; |
| 3335 | } |
| 3336 | |
| 3337 | |
Yangtao Li | d32dcc6 | 2018-12-15 03:45:26 -0500 | [diff] [blame] | 3338 | static int devices_show(struct seq_file *s, void *data) |
Thara Gopinath | b6a1d09 | 2017-07-14 13:10:16 -0400 | [diff] [blame] | 3339 | { |
| 3340 | struct generic_pm_domain *genpd = s->private; |
| 3341 | struct pm_domain_data *pm_data; |
| 3342 | const char *kobj_path; |
| 3343 | int ret = 0; |
| 3344 | |
| 3345 | ret = genpd_lock_interruptible(genpd); |
| 3346 | if (ret) |
| 3347 | return -ERESTARTSYS; |
| 3348 | |
| 3349 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
| 3350 | kobj_path = kobject_get_path(&pm_data->dev->kobj, |
| 3351 | genpd_is_irq_safe(genpd) ? |
| 3352 | GFP_ATOMIC : GFP_KERNEL); |
| 3353 | if (kobj_path == NULL) |
| 3354 | continue; |
| 3355 | |
| 3356 | seq_printf(s, "%s\n", kobj_path); |
| 3357 | kfree(kobj_path); |
| 3358 | } |
| 3359 | |
| 3360 | genpd_unlock(genpd); |
| 3361 | return ret; |
| 3362 | } |
| 3363 | |
Yangtao Li | d32dcc6 | 2018-12-15 03:45:26 -0500 | [diff] [blame] | 3364 | static int perf_state_show(struct seq_file *s, void *data) |
Rajendra Nayak | e891281 | 2018-05-30 15:15:17 +0530 | [diff] [blame] | 3365 | { |
| 3366 | struct generic_pm_domain *genpd = s->private; |
| 3367 | |
| 3368 | if (genpd_lock_interruptible(genpd)) |
| 3369 | return -ERESTARTSYS; |
| 3370 | |
| 3371 | seq_printf(s, "%u\n", genpd->performance_state); |
| 3372 | |
| 3373 | genpd_unlock(genpd); |
| 3374 | return 0; |
| 3375 | } |
| 3376 | |
Yangtao Li | d32dcc6 | 2018-12-15 03:45:26 -0500 | [diff] [blame] | 3377 | DEFINE_SHOW_ATTRIBUTE(summary); |
| 3378 | DEFINE_SHOW_ATTRIBUTE(status); |
| 3379 | DEFINE_SHOW_ATTRIBUTE(sub_domains); |
| 3380 | DEFINE_SHOW_ATTRIBUTE(idle_states); |
| 3381 | DEFINE_SHOW_ATTRIBUTE(active_time); |
| 3382 | DEFINE_SHOW_ATTRIBUTE(total_idle_time); |
| 3383 | DEFINE_SHOW_ATTRIBUTE(devices); |
| 3384 | DEFINE_SHOW_ATTRIBUTE(perf_state); |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3385 | |
Thierry Strudel | 718072c | 2020-12-08 11:19:55 -0800 | [diff] [blame] | 3386 | static void genpd_debug_add(struct generic_pm_domain *genpd) |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3387 | { |
| 3388 | struct dentry *d; |
Thierry Strudel | 718072c | 2020-12-08 11:19:55 -0800 | [diff] [blame] | 3389 | |
| 3390 | if (!genpd_debugfs_dir) |
| 3391 | return; |
| 3392 | |
| 3393 | d = debugfs_create_dir(genpd->name, genpd_debugfs_dir); |
| 3394 | |
| 3395 | debugfs_create_file("current_state", 0444, |
| 3396 | d, genpd, &status_fops); |
| 3397 | debugfs_create_file("sub_domains", 0444, |
| 3398 | d, genpd, &sub_domains_fops); |
| 3399 | debugfs_create_file("idle_states", 0444, |
| 3400 | d, genpd, &idle_states_fops); |
| 3401 | debugfs_create_file("active_time", 0444, |
| 3402 | d, genpd, &active_time_fops); |
| 3403 | debugfs_create_file("total_idle_time", 0444, |
| 3404 | d, genpd, &total_idle_time_fops); |
| 3405 | debugfs_create_file("devices", 0444, |
| 3406 | d, genpd, &devices_fops); |
| 3407 | if (genpd->set_performance_state) |
| 3408 | debugfs_create_file("perf_state", 0444, |
| 3409 | d, genpd, &perf_state_fops); |
| 3410 | } |
| 3411 | |
| 3412 | static int __init genpd_debug_init(void) |
| 3413 | { |
Thara Gopinath | b6a1d09 | 2017-07-14 13:10:16 -0400 | [diff] [blame] | 3414 | struct generic_pm_domain *genpd; |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3415 | |
Ulf Hansson | 9e9704e | 2017-10-06 09:02:06 +0200 | [diff] [blame] | 3416 | genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3417 | |
Greg Kroah-Hartman | e16a42c | 2019-01-22 16:21:05 +0100 | [diff] [blame] | 3418 | debugfs_create_file("pm_genpd_summary", S_IRUGO, genpd_debugfs_dir, |
| 3419 | NULL, &summary_fops); |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3420 | |
Thierry Strudel | 718072c | 2020-12-08 11:19:55 -0800 | [diff] [blame] | 3421 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) |
| 3422 | genpd_debug_add(genpd); |
Thara Gopinath | b6a1d09 | 2017-07-14 13:10:16 -0400 | [diff] [blame] | 3423 | |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3424 | return 0; |
| 3425 | } |
Ulf Hansson | 9e9704e | 2017-10-06 09:02:06 +0200 | [diff] [blame] | 3426 | late_initcall(genpd_debug_init); |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3427 | |
Ulf Hansson | 9e9704e | 2017-10-06 09:02:06 +0200 | [diff] [blame] | 3428 | static void __exit genpd_debug_exit(void) |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3429 | { |
Ulf Hansson | 9e9704e | 2017-10-06 09:02:06 +0200 | [diff] [blame] | 3430 | debugfs_remove_recursive(genpd_debugfs_dir); |
Maciej Matraszek | 2bd5306 | 2014-09-15 13:09:10 +0200 | [diff] [blame] | 3431 | } |
Ulf Hansson | 9e9704e | 2017-10-06 09:02:06 +0200 | [diff] [blame] | 3432 | __exitcall(genpd_debug_exit); |
Jon Hunter | 8b0510b | 2016-08-11 11:40:05 +0100 | [diff] [blame] | 3433 | #endif /* CONFIG_DEBUG_FS */ |