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Commit | Line | Data |
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f721889f RW |
1 | /* |
2 | * drivers/base/power/domain.c - Common code related to device power domains. | |
3 | * | |
4 | * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. | |
5 | * | |
6 | * This file is released under the GPLv2. | |
7 | */ | |
8 | ||
93af5e93 | 9 | #include <linux/delay.h> |
f721889f RW |
10 | #include <linux/kernel.h> |
11 | #include <linux/io.h> | |
aa42240a | 12 | #include <linux/platform_device.h> |
f721889f RW |
13 | #include <linux/pm_runtime.h> |
14 | #include <linux/pm_domain.h> | |
6ff7bb0d | 15 | #include <linux/pm_qos.h> |
c11f6f5b | 16 | #include <linux/pm_clock.h> |
f721889f RW |
17 | #include <linux/slab.h> |
18 | #include <linux/err.h> | |
17b75eca RW |
19 | #include <linux/sched.h> |
20 | #include <linux/suspend.h> | |
d5e4cbfe RW |
21 | #include <linux/export.h> |
22 | ||
93af5e93 GU |
23 | #define GENPD_RETRY_MAX_MS 250 /* Approximate */ |
24 | ||
d5e4cbfe RW |
25 | #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ |
26 | ({ \ | |
27 | type (*__routine)(struct device *__d); \ | |
28 | type __ret = (type)0; \ | |
29 | \ | |
30 | __routine = genpd->dev_ops.callback; \ | |
31 | if (__routine) { \ | |
32 | __ret = __routine(dev); \ | |
d5e4cbfe RW |
33 | } \ |
34 | __ret; \ | |
35 | }) | |
f721889f | 36 | |
5125bbf3 RW |
37 | static LIST_HEAD(gpd_list); |
38 | static DEFINE_MUTEX(gpd_list_lock); | |
39 | ||
446d999c RK |
40 | /* |
41 | * Get the generic PM domain for a particular struct device. | |
42 | * This validates the struct device pointer, the PM domain pointer, | |
43 | * and checks that the PM domain pointer is a real generic PM domain. | |
44 | * Any failure results in NULL being returned. | |
45 | */ | |
46 | struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev) | |
47 | { | |
48 | struct generic_pm_domain *genpd = NULL, *gpd; | |
49 | ||
50 | if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain)) | |
51 | return NULL; | |
52 | ||
53 | mutex_lock(&gpd_list_lock); | |
54 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
55 | if (&gpd->domain == dev->pm_domain) { | |
56 | genpd = gpd; | |
57 | break; | |
58 | } | |
59 | } | |
60 | mutex_unlock(&gpd_list_lock); | |
61 | ||
62 | return genpd; | |
63 | } | |
64 | ||
65 | /* | |
66 | * This should only be used where we are certain that the pm_domain | |
67 | * attached to the device is a genpd domain. | |
68 | */ | |
69 | static struct generic_pm_domain *dev_to_genpd(struct device *dev) | |
5248051b RW |
70 | { |
71 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
72 | return ERR_PTR(-EINVAL); | |
73 | ||
596ba34b | 74 | return pd_to_genpd(dev->pm_domain); |
5248051b | 75 | } |
f721889f | 76 | |
2b1d88cd | 77 | static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev) |
d5e4cbfe | 78 | { |
2b1d88cd | 79 | return GENPD_DEV_CALLBACK(genpd, int, stop, dev); |
d5e4cbfe RW |
80 | } |
81 | ||
2b1d88cd | 82 | static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev) |
d5e4cbfe | 83 | { |
2b1d88cd | 84 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); |
d5e4cbfe RW |
85 | } |
86 | ||
c4bb3160 | 87 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 88 | { |
c4bb3160 RW |
89 | bool ret = false; |
90 | ||
91 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
92 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
93 | ||
94 | return ret; | |
95 | } | |
96 | ||
97 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
98 | { | |
99 | atomic_inc(&genpd->sd_count); | |
4e857c58 | 100 | smp_mb__after_atomic(); |
f721889f RW |
101 | } |
102 | ||
a4630c61 | 103 | static int genpd_power_on(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 GU |
104 | { |
105 | ktime_t time_start; | |
106 | s64 elapsed_ns; | |
107 | int ret; | |
108 | ||
109 | if (!genpd->power_on) | |
110 | return 0; | |
111 | ||
a4630c61 GU |
112 | if (!timed) |
113 | return genpd->power_on(genpd); | |
114 | ||
c8f0ea45 GU |
115 | time_start = ktime_get(); |
116 | ret = genpd->power_on(genpd); | |
117 | if (ret) | |
118 | return ret; | |
119 | ||
120 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
121 | if (elapsed_ns <= genpd->power_on_latency_ns) | |
122 | return ret; | |
123 | ||
124 | genpd->power_on_latency_ns = elapsed_ns; | |
125 | genpd->max_off_time_changed = true; | |
6d7d5c32 RK |
126 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
127 | genpd->name, "on", elapsed_ns); | |
c8f0ea45 GU |
128 | |
129 | return ret; | |
130 | } | |
131 | ||
a4630c61 | 132 | static int genpd_power_off(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 GU |
133 | { |
134 | ktime_t time_start; | |
135 | s64 elapsed_ns; | |
136 | int ret; | |
137 | ||
138 | if (!genpd->power_off) | |
139 | return 0; | |
140 | ||
a4630c61 GU |
141 | if (!timed) |
142 | return genpd->power_off(genpd); | |
143 | ||
c8f0ea45 GU |
144 | time_start = ktime_get(); |
145 | ret = genpd->power_off(genpd); | |
146 | if (ret == -EBUSY) | |
147 | return ret; | |
148 | ||
149 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
150 | if (elapsed_ns <= genpd->power_off_latency_ns) | |
151 | return ret; | |
152 | ||
153 | genpd->power_off_latency_ns = elapsed_ns; | |
154 | genpd->max_off_time_changed = true; | |
6d7d5c32 RK |
155 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
156 | genpd->name, "off", elapsed_ns); | |
c8f0ea45 GU |
157 | |
158 | return ret; | |
159 | } | |
160 | ||
29e47e21 | 161 | /** |
7420aa4f | 162 | * genpd_queue_power_off_work - Queue up the execution of genpd_poweroff(). |
29e47e21 UH |
163 | * @genpd: PM domait to power off. |
164 | * | |
7420aa4f | 165 | * Queue up the execution of genpd_poweroff() unless it's already been done |
29e47e21 UH |
166 | * before. |
167 | */ | |
168 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) | |
169 | { | |
170 | queue_work(pm_wq, &genpd->power_off_work); | |
171 | } | |
172 | ||
7420aa4f | 173 | static int genpd_poweron(struct generic_pm_domain *genpd); |
ea823c7c | 174 | |
5248051b | 175 | /** |
7420aa4f | 176 | * __genpd_poweron - Restore power to a given PM domain and its masters. |
5248051b RW |
177 | * @genpd: PM domain to power up. |
178 | * | |
5063ce15 | 179 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
180 | * resume a device belonging to it. |
181 | */ | |
7420aa4f | 182 | static int __genpd_poweron(struct generic_pm_domain *genpd) |
5248051b | 183 | { |
5063ce15 | 184 | struct gpd_link *link; |
5248051b RW |
185 | int ret = 0; |
186 | ||
17b75eca | 187 | if (genpd->status == GPD_STATE_ACTIVE |
596ba34b | 188 | || (genpd->prepared_count > 0 && genpd->suspend_power_off)) |
3f241775 | 189 | return 0; |
5248051b | 190 | |
5063ce15 RW |
191 | /* |
192 | * The list is guaranteed not to change while the loop below is being | |
193 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
194 | * with it. | |
195 | */ | |
196 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
197 | genpd_sd_counter_inc(link->master); | |
5248051b | 198 | |
7420aa4f | 199 | ret = genpd_poweron(link->master); |
5063ce15 RW |
200 | if (ret) { |
201 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 202 | goto err; |
5063ce15 | 203 | } |
5248051b RW |
204 | } |
205 | ||
a4630c61 | 206 | ret = genpd_power_on(genpd, true); |
c8f0ea45 GU |
207 | if (ret) |
208 | goto err; | |
5248051b | 209 | |
ba2bbfbf | 210 | genpd->status = GPD_STATE_ACTIVE; |
3f241775 | 211 | return 0; |
9e08cf42 RW |
212 | |
213 | err: | |
29e47e21 UH |
214 | list_for_each_entry_continue_reverse(link, |
215 | &genpd->slave_links, | |
216 | slave_node) { | |
5063ce15 | 217 | genpd_sd_counter_dec(link->master); |
29e47e21 UH |
218 | genpd_queue_power_off_work(link->master); |
219 | } | |
9e08cf42 | 220 | |
3f241775 RW |
221 | return ret; |
222 | } | |
223 | ||
224 | /** | |
7420aa4f | 225 | * genpd_poweron - Restore power to a given PM domain and its masters. |
3f241775 RW |
226 | * @genpd: PM domain to power up. |
227 | */ | |
7420aa4f | 228 | static int genpd_poweron(struct generic_pm_domain *genpd) |
3f241775 RW |
229 | { |
230 | int ret; | |
231 | ||
232 | mutex_lock(&genpd->lock); | |
7420aa4f | 233 | ret = __genpd_poweron(genpd); |
3f241775 RW |
234 | mutex_unlock(&genpd->lock); |
235 | return ret; | |
5248051b RW |
236 | } |
237 | ||
8e9afafd RW |
238 | static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev) |
239 | { | |
2b1d88cd | 240 | return GENPD_DEV_CALLBACK(genpd, int, save_state, dev); |
8e9afafd RW |
241 | } |
242 | ||
ba2bbfbf | 243 | static int genpd_restore_dev(struct generic_pm_domain *genpd, |
2b1d88cd | 244 | struct device *dev) |
8e9afafd | 245 | { |
2b1d88cd | 246 | return GENPD_DEV_CALLBACK(genpd, int, restore_state, dev); |
8e9afafd RW |
247 | } |
248 | ||
6ff7bb0d RW |
249 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
250 | unsigned long val, void *ptr) | |
251 | { | |
252 | struct generic_pm_domain_data *gpd_data; | |
253 | struct device *dev; | |
254 | ||
255 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
6ff7bb0d | 256 | dev = gpd_data->base.dev; |
6ff7bb0d RW |
257 | |
258 | for (;;) { | |
259 | struct generic_pm_domain *genpd; | |
260 | struct pm_domain_data *pdd; | |
261 | ||
262 | spin_lock_irq(&dev->power.lock); | |
263 | ||
264 | pdd = dev->power.subsys_data ? | |
265 | dev->power.subsys_data->domain_data : NULL; | |
1d5fcfec | 266 | if (pdd && pdd->dev) { |
6ff7bb0d RW |
267 | to_gpd_data(pdd)->td.constraint_changed = true; |
268 | genpd = dev_to_genpd(dev); | |
269 | } else { | |
270 | genpd = ERR_PTR(-ENODATA); | |
271 | } | |
272 | ||
273 | spin_unlock_irq(&dev->power.lock); | |
274 | ||
275 | if (!IS_ERR(genpd)) { | |
276 | mutex_lock(&genpd->lock); | |
277 | genpd->max_off_time_changed = true; | |
278 | mutex_unlock(&genpd->lock); | |
279 | } | |
280 | ||
281 | dev = dev->parent; | |
282 | if (!dev || dev->power.ignore_children) | |
283 | break; | |
284 | } | |
285 | ||
286 | return NOTIFY_DONE; | |
287 | } | |
288 | ||
f721889f | 289 | /** |
7420aa4f | 290 | * genpd_poweroff - Remove power from a given PM domain. |
f721889f | 291 | * @genpd: PM domain to power down. |
f96b3c4f | 292 | * @is_async: PM domain is powered down from a scheduled work |
f721889f RW |
293 | * |
294 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
ba2bbfbf | 295 | * have been powered down, remove power from @genpd. |
f721889f | 296 | */ |
7420aa4f | 297 | static int genpd_poweroff(struct generic_pm_domain *genpd, bool is_async) |
f721889f | 298 | { |
4605ab65 | 299 | struct pm_domain_data *pdd; |
5063ce15 | 300 | struct gpd_link *link; |
ba2bbfbf | 301 | unsigned int not_suspended = 0; |
f721889f | 302 | |
c6d22b37 RW |
303 | /* |
304 | * Do not try to power off the domain in the following situations: | |
305 | * (1) The domain is already in the "power off" state. | |
ba2bbfbf | 306 | * (2) System suspend is in progress. |
c6d22b37 | 307 | */ |
3f241775 | 308 | if (genpd->status == GPD_STATE_POWER_OFF |
ba2bbfbf | 309 | || genpd->prepared_count > 0) |
f721889f RW |
310 | return 0; |
311 | ||
c4bb3160 | 312 | if (atomic_read(&genpd->sd_count) > 0) |
f721889f RW |
313 | return -EBUSY; |
314 | ||
34b1f762 RW |
315 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
316 | enum pm_qos_flags_status stat; | |
317 | ||
318 | stat = dev_pm_qos_flags(pdd->dev, | |
319 | PM_QOS_FLAG_NO_POWER_OFF | |
320 | | PM_QOS_FLAG_REMOTE_WAKEUP); | |
321 | if (stat > PM_QOS_FLAGS_NONE) | |
322 | return -EBUSY; | |
323 | ||
298cd0f0 | 324 | if (!pm_runtime_suspended(pdd->dev) || pdd->dev->power.irq_safe) |
f721889f | 325 | not_suspended++; |
34b1f762 | 326 | } |
f721889f | 327 | |
f96b3c4f | 328 | if (not_suspended > 1 || (not_suspended == 1 && is_async)) |
f721889f RW |
329 | return -EBUSY; |
330 | ||
331 | if (genpd->gov && genpd->gov->power_down_ok) { | |
332 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
333 | return -EAGAIN; | |
334 | } | |
335 | ||
3c07cbc4 | 336 | if (genpd->power_off) { |
ba2bbfbf UH |
337 | int ret; |
338 | ||
339 | if (atomic_read(&genpd->sd_count) > 0) | |
340 | return -EBUSY; | |
17b75eca | 341 | |
3c07cbc4 | 342 | /* |
5063ce15 | 343 | * If sd_count > 0 at this point, one of the subdomains hasn't |
7420aa4f UH |
344 | * managed to call genpd_poweron() for the master yet after |
345 | * incrementing it. In that case genpd_poweron() will wait | |
3c07cbc4 | 346 | * for us to drop the lock, so we can call .power_off() and let |
7420aa4f | 347 | * the genpd_poweron() restore power for us (this shouldn't |
3c07cbc4 RW |
348 | * happen very often). |
349 | */ | |
a4630c61 | 350 | ret = genpd_power_off(genpd, true); |
ba2bbfbf UH |
351 | if (ret) |
352 | return ret; | |
d2805402 | 353 | } |
f721889f | 354 | |
17b75eca | 355 | genpd->status = GPD_STATE_POWER_OFF; |
221e9b58 | 356 | |
5063ce15 RW |
357 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
358 | genpd_sd_counter_dec(link->master); | |
359 | genpd_queue_power_off_work(link->master); | |
360 | } | |
f721889f | 361 | |
ba2bbfbf | 362 | return 0; |
f721889f RW |
363 | } |
364 | ||
365 | /** | |
366 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
367 | * @work: Work structure used for scheduling the execution of this function. | |
368 | */ | |
369 | static void genpd_power_off_work_fn(struct work_struct *work) | |
370 | { | |
371 | struct generic_pm_domain *genpd; | |
372 | ||
373 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
374 | ||
ba2bbfbf | 375 | mutex_lock(&genpd->lock); |
7420aa4f | 376 | genpd_poweroff(genpd, true); |
ba2bbfbf | 377 | mutex_unlock(&genpd->lock); |
f721889f RW |
378 | } |
379 | ||
380 | /** | |
381 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. | |
382 | * @dev: Device to suspend. | |
383 | * | |
384 | * Carry out a runtime suspend of a device under the assumption that its | |
385 | * pm_domain field points to the domain member of an object of type | |
386 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
387 | */ | |
388 | static int pm_genpd_runtime_suspend(struct device *dev) | |
389 | { | |
390 | struct generic_pm_domain *genpd; | |
b02c999a | 391 | bool (*stop_ok)(struct device *__dev); |
2b1d88cd UH |
392 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
393 | ktime_t time_start; | |
394 | s64 elapsed_ns; | |
d5e4cbfe | 395 | int ret; |
f721889f RW |
396 | |
397 | dev_dbg(dev, "%s()\n", __func__); | |
398 | ||
5248051b RW |
399 | genpd = dev_to_genpd(dev); |
400 | if (IS_ERR(genpd)) | |
f721889f RW |
401 | return -EINVAL; |
402 | ||
b02c999a RW |
403 | stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL; |
404 | if (stop_ok && !stop_ok(dev)) | |
405 | return -EBUSY; | |
406 | ||
2b1d88cd UH |
407 | /* Measure suspend latency. */ |
408 | time_start = ktime_get(); | |
409 | ||
ba2bbfbf | 410 | ret = genpd_save_dev(genpd, dev); |
d5e4cbfe RW |
411 | if (ret) |
412 | return ret; | |
17b75eca | 413 | |
2b1d88cd | 414 | ret = genpd_stop_dev(genpd, dev); |
ba2bbfbf | 415 | if (ret) { |
2b1d88cd | 416 | genpd_restore_dev(genpd, dev); |
ba2bbfbf UH |
417 | return ret; |
418 | } | |
419 | ||
2b1d88cd UH |
420 | /* Update suspend latency value if the measured time exceeds it. */ |
421 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
422 | if (elapsed_ns > td->suspend_latency_ns) { | |
423 | td->suspend_latency_ns = elapsed_ns; | |
424 | dev_dbg(dev, "suspend latency exceeded, %lld ns\n", | |
425 | elapsed_ns); | |
426 | genpd->max_off_time_changed = true; | |
427 | td->constraint_changed = true; | |
428 | } | |
429 | ||
0aa2a221 RW |
430 | /* |
431 | * If power.irq_safe is set, this routine will be run with interrupts | |
432 | * off, so it can't use mutexes. | |
433 | */ | |
434 | if (dev->power.irq_safe) | |
435 | return 0; | |
436 | ||
c6d22b37 | 437 | mutex_lock(&genpd->lock); |
7420aa4f | 438 | genpd_poweroff(genpd, false); |
c6d22b37 | 439 | mutex_unlock(&genpd->lock); |
f721889f RW |
440 | |
441 | return 0; | |
442 | } | |
443 | ||
f721889f RW |
444 | /** |
445 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
446 | * @dev: Device to resume. | |
447 | * | |
448 | * Carry out a runtime resume of a device under the assumption that its | |
449 | * pm_domain field points to the domain member of an object of type | |
450 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
451 | */ | |
452 | static int pm_genpd_runtime_resume(struct device *dev) | |
453 | { | |
454 | struct generic_pm_domain *genpd; | |
2b1d88cd UH |
455 | struct gpd_timing_data *td = &dev_gpd_data(dev)->td; |
456 | ktime_t time_start; | |
457 | s64 elapsed_ns; | |
f721889f | 458 | int ret; |
ba2bbfbf | 459 | bool timed = true; |
f721889f RW |
460 | |
461 | dev_dbg(dev, "%s()\n", __func__); | |
462 | ||
5248051b RW |
463 | genpd = dev_to_genpd(dev); |
464 | if (IS_ERR(genpd)) | |
f721889f RW |
465 | return -EINVAL; |
466 | ||
0aa2a221 | 467 | /* If power.irq_safe, the PM domain is never powered off. */ |
ba2bbfbf UH |
468 | if (dev->power.irq_safe) { |
469 | timed = false; | |
470 | goto out; | |
471 | } | |
0aa2a221 | 472 | |
c6d22b37 | 473 | mutex_lock(&genpd->lock); |
7420aa4f | 474 | ret = __genpd_poweron(genpd); |
ba2bbfbf | 475 | mutex_unlock(&genpd->lock); |
c6d22b37 | 476 | |
ba2bbfbf UH |
477 | if (ret) |
478 | return ret; | |
c6d22b37 | 479 | |
ba2bbfbf | 480 | out: |
2b1d88cd UH |
481 | /* Measure resume latency. */ |
482 | if (timed) | |
483 | time_start = ktime_get(); | |
484 | ||
485 | genpd_start_dev(genpd, dev); | |
486 | genpd_restore_dev(genpd, dev); | |
487 | ||
488 | /* Update resume latency value if the measured time exceeds it. */ | |
489 | if (timed) { | |
490 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
491 | if (elapsed_ns > td->resume_latency_ns) { | |
492 | td->resume_latency_ns = elapsed_ns; | |
493 | dev_dbg(dev, "resume latency exceeded, %lld ns\n", | |
494 | elapsed_ns); | |
495 | genpd->max_off_time_changed = true; | |
496 | td->constraint_changed = true; | |
497 | } | |
498 | } | |
17b75eca | 499 | |
f721889f RW |
500 | return 0; |
501 | } | |
502 | ||
39ac5ba5 TB |
503 | static bool pd_ignore_unused; |
504 | static int __init pd_ignore_unused_setup(char *__unused) | |
505 | { | |
506 | pd_ignore_unused = true; | |
507 | return 1; | |
508 | } | |
509 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
510 | ||
17f2ae7f | 511 | /** |
bb4b72fc | 512 | * genpd_poweroff_unused - Power off all PM domains with no devices in use. |
17f2ae7f | 513 | */ |
bb4b72fc | 514 | static int __init genpd_poweroff_unused(void) |
17f2ae7f RW |
515 | { |
516 | struct generic_pm_domain *genpd; | |
517 | ||
39ac5ba5 TB |
518 | if (pd_ignore_unused) { |
519 | pr_warn("genpd: Not disabling unused power domains\n"); | |
bb4b72fc | 520 | return 0; |
39ac5ba5 TB |
521 | } |
522 | ||
17f2ae7f RW |
523 | mutex_lock(&gpd_list_lock); |
524 | ||
525 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
526 | genpd_queue_power_off_work(genpd); | |
527 | ||
528 | mutex_unlock(&gpd_list_lock); | |
17f2ae7f | 529 | |
2fe71dcd UH |
530 | return 0; |
531 | } | |
532 | late_initcall(genpd_poweroff_unused); | |
533 | ||
596ba34b RW |
534 | #ifdef CONFIG_PM_SLEEP |
535 | ||
77f827de RW |
536 | /** |
537 | * pm_genpd_present - Check if the given PM domain has been initialized. | |
538 | * @genpd: PM domain to check. | |
539 | */ | |
895b31f3 | 540 | static bool pm_genpd_present(const struct generic_pm_domain *genpd) |
77f827de | 541 | { |
895b31f3 | 542 | const struct generic_pm_domain *gpd; |
77f827de RW |
543 | |
544 | if (IS_ERR_OR_NULL(genpd)) | |
545 | return false; | |
546 | ||
547 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
548 | if (gpd == genpd) | |
549 | return true; | |
550 | ||
551 | return false; | |
552 | } | |
553 | ||
d5e4cbfe RW |
554 | static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, |
555 | struct device *dev) | |
556 | { | |
557 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); | |
558 | } | |
559 | ||
596ba34b | 560 | /** |
5063ce15 | 561 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters. |
596ba34b | 562 | * @genpd: PM domain to power off, if possible. |
a4630c61 | 563 | * @timed: True if latency measurements are allowed. |
596ba34b RW |
564 | * |
565 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 566 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b | 567 | * |
77f827de RW |
568 | * This function is only called in "noirq" and "syscore" stages of system power |
569 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
570 | * executed sequentially, so it is guaranteed that it will never run twice in | |
571 | * parallel). | |
596ba34b | 572 | */ |
a4630c61 GU |
573 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd, |
574 | bool timed) | |
596ba34b | 575 | { |
5063ce15 | 576 | struct gpd_link *link; |
596ba34b | 577 | |
17b75eca | 578 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
579 | return; |
580 | ||
c4bb3160 RW |
581 | if (genpd->suspended_count != genpd->device_count |
582 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
583 | return; |
584 | ||
a4630c61 | 585 | genpd_power_off(genpd, timed); |
596ba34b | 586 | |
17b75eca | 587 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
588 | |
589 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
590 | genpd_sd_counter_dec(link->master); | |
a4630c61 | 591 | pm_genpd_sync_poweroff(link->master, timed); |
596ba34b RW |
592 | } |
593 | } | |
594 | ||
802d8b49 RW |
595 | /** |
596 | * pm_genpd_sync_poweron - Synchronously power on a PM domain and its masters. | |
597 | * @genpd: PM domain to power on. | |
a4630c61 | 598 | * @timed: True if latency measurements are allowed. |
802d8b49 | 599 | * |
77f827de RW |
600 | * This function is only called in "noirq" and "syscore" stages of system power |
601 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
602 | * executed sequentially, so it is guaranteed that it will never run twice in | |
603 | * parallel). | |
802d8b49 | 604 | */ |
a4630c61 GU |
605 | static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd, |
606 | bool timed) | |
802d8b49 RW |
607 | { |
608 | struct gpd_link *link; | |
609 | ||
ba2bbfbf | 610 | if (genpd->status == GPD_STATE_ACTIVE) |
802d8b49 RW |
611 | return; |
612 | ||
613 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
a4630c61 | 614 | pm_genpd_sync_poweron(link->master, timed); |
802d8b49 RW |
615 | genpd_sd_counter_inc(link->master); |
616 | } | |
617 | ||
a4630c61 | 618 | genpd_power_on(genpd, timed); |
802d8b49 RW |
619 | |
620 | genpd->status = GPD_STATE_ACTIVE; | |
621 | } | |
622 | ||
4ecd6e65 RW |
623 | /** |
624 | * resume_needed - Check whether to resume a device before system suspend. | |
625 | * @dev: Device to check. | |
626 | * @genpd: PM domain the device belongs to. | |
627 | * | |
628 | * There are two cases in which a device that can wake up the system from sleep | |
629 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
630 | * to wake up the system and it has to remain active for this purpose while the | |
631 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
632 | * the system from sleep states and it generally doesn't generate wakeup signals | |
633 | * by itself (those signals are generated on its behalf by other parts of the | |
634 | * system). In the latter case it may be necessary to reconfigure the device's | |
635 | * wakeup settings during system suspend, because it may have been set up to | |
636 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
637 | * Return 'true' in either of the above cases. | |
638 | */ | |
639 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
640 | { | |
641 | bool active_wakeup; | |
642 | ||
643 | if (!device_can_wakeup(dev)) | |
644 | return false; | |
645 | ||
d5e4cbfe | 646 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
4ecd6e65 RW |
647 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
648 | } | |
649 | ||
596ba34b RW |
650 | /** |
651 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
652 | * @dev: Device to start the transition of. | |
653 | * | |
654 | * Start a power transition of a device (during a system-wide power transition) | |
655 | * under the assumption that its pm_domain field points to the domain member of | |
656 | * an object of type struct generic_pm_domain representing a PM domain | |
657 | * consisting of I/O devices. | |
658 | */ | |
659 | static int pm_genpd_prepare(struct device *dev) | |
660 | { | |
661 | struct generic_pm_domain *genpd; | |
b6c10c84 | 662 | int ret; |
596ba34b RW |
663 | |
664 | dev_dbg(dev, "%s()\n", __func__); | |
665 | ||
666 | genpd = dev_to_genpd(dev); | |
667 | if (IS_ERR(genpd)) | |
668 | return -EINVAL; | |
669 | ||
17b75eca RW |
670 | /* |
671 | * If a wakeup request is pending for the device, it should be woken up | |
672 | * at this point and a system wakeup event should be reported if it's | |
673 | * set up to wake up the system from sleep states. | |
674 | */ | |
675 | pm_runtime_get_noresume(dev); | |
676 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
677 | pm_wakeup_event(dev, 0); | |
678 | ||
679 | if (pm_wakeup_pending()) { | |
84167035 | 680 | pm_runtime_put(dev); |
17b75eca RW |
681 | return -EBUSY; |
682 | } | |
683 | ||
4ecd6e65 RW |
684 | if (resume_needed(dev, genpd)) |
685 | pm_runtime_resume(dev); | |
686 | ||
ba2bbfbf | 687 | mutex_lock(&genpd->lock); |
596ba34b | 688 | |
65533bbf RW |
689 | if (genpd->prepared_count++ == 0) { |
690 | genpd->suspended_count = 0; | |
17b75eca | 691 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
65533bbf | 692 | } |
17b75eca | 693 | |
ba2bbfbf | 694 | mutex_unlock(&genpd->lock); |
596ba34b RW |
695 | |
696 | if (genpd->suspend_power_off) { | |
17b75eca | 697 | pm_runtime_put_noidle(dev); |
596ba34b RW |
698 | return 0; |
699 | } | |
700 | ||
701 | /* | |
17b75eca | 702 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
7420aa4f | 703 | * so genpd_poweron() will return immediately, but if the device |
d5e4cbfe | 704 | * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need |
17b75eca | 705 | * to make it operational. |
596ba34b | 706 | */ |
17b75eca | 707 | pm_runtime_resume(dev); |
596ba34b RW |
708 | __pm_runtime_disable(dev, false); |
709 | ||
b6c10c84 RW |
710 | ret = pm_generic_prepare(dev); |
711 | if (ret) { | |
712 | mutex_lock(&genpd->lock); | |
713 | ||
714 | if (--genpd->prepared_count == 0) | |
715 | genpd->suspend_power_off = false; | |
716 | ||
717 | mutex_unlock(&genpd->lock); | |
17b75eca | 718 | pm_runtime_enable(dev); |
b6c10c84 | 719 | } |
17b75eca | 720 | |
84167035 | 721 | pm_runtime_put(dev); |
b6c10c84 | 722 | return ret; |
596ba34b RW |
723 | } |
724 | ||
725 | /** | |
726 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. | |
727 | * @dev: Device to suspend. | |
728 | * | |
729 | * Suspend a device under the assumption that its pm_domain field points to the | |
730 | * domain member of an object of type struct generic_pm_domain representing | |
731 | * a PM domain consisting of I/O devices. | |
732 | */ | |
733 | static int pm_genpd_suspend(struct device *dev) | |
734 | { | |
735 | struct generic_pm_domain *genpd; | |
736 | ||
737 | dev_dbg(dev, "%s()\n", __func__); | |
738 | ||
739 | genpd = dev_to_genpd(dev); | |
740 | if (IS_ERR(genpd)) | |
741 | return -EINVAL; | |
742 | ||
1e0407ca | 743 | return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev); |
596ba34b RW |
744 | } |
745 | ||
746 | /** | |
0496c8ae | 747 | * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain. |
596ba34b RW |
748 | * @dev: Device to suspend. |
749 | * | |
750 | * Carry out a late suspend of a device under the assumption that its | |
751 | * pm_domain field points to the domain member of an object of type | |
752 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
753 | */ | |
0496c8ae | 754 | static int pm_genpd_suspend_late(struct device *dev) |
596ba34b RW |
755 | { |
756 | struct generic_pm_domain *genpd; | |
596ba34b RW |
757 | |
758 | dev_dbg(dev, "%s()\n", __func__); | |
759 | ||
760 | genpd = dev_to_genpd(dev); | |
761 | if (IS_ERR(genpd)) | |
762 | return -EINVAL; | |
763 | ||
1e0407ca | 764 | return genpd->suspend_power_off ? 0 : pm_generic_suspend_late(dev); |
0496c8ae | 765 | } |
596ba34b | 766 | |
0496c8ae RW |
767 | /** |
768 | * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. | |
769 | * @dev: Device to suspend. | |
770 | * | |
771 | * Stop the device and remove power from the domain if all devices in it have | |
772 | * been stopped. | |
773 | */ | |
774 | static int pm_genpd_suspend_noirq(struct device *dev) | |
775 | { | |
776 | struct generic_pm_domain *genpd; | |
777 | ||
778 | dev_dbg(dev, "%s()\n", __func__); | |
779 | ||
780 | genpd = dev_to_genpd(dev); | |
781 | if (IS_ERR(genpd)) | |
782 | return -EINVAL; | |
596ba34b | 783 | |
dbf37414 | 784 | if (genpd->suspend_power_off |
0496c8ae | 785 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
d4f2d87a RW |
786 | return 0; |
787 | ||
2b1d88cd | 788 | genpd_stop_dev(genpd, dev); |
596ba34b RW |
789 | |
790 | /* | |
791 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
792 | * guaranteed that this function will never run twice in parallel for | |
793 | * the same PM domain, so it is not necessary to use locking here. | |
794 | */ | |
795 | genpd->suspended_count++; | |
a4630c61 | 796 | pm_genpd_sync_poweroff(genpd, true); |
596ba34b RW |
797 | |
798 | return 0; | |
799 | } | |
800 | ||
801 | /** | |
0496c8ae | 802 | * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
803 | * @dev: Device to resume. |
804 | * | |
0496c8ae | 805 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b RW |
806 | */ |
807 | static int pm_genpd_resume_noirq(struct device *dev) | |
808 | { | |
809 | struct generic_pm_domain *genpd; | |
810 | ||
811 | dev_dbg(dev, "%s()\n", __func__); | |
812 | ||
813 | genpd = dev_to_genpd(dev); | |
814 | if (IS_ERR(genpd)) | |
815 | return -EINVAL; | |
816 | ||
dbf37414 | 817 | if (genpd->suspend_power_off |
cc85b207 | 818 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
596ba34b RW |
819 | return 0; |
820 | ||
821 | /* | |
822 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
823 | * guaranteed that this function will never run twice in parallel for | |
824 | * the same PM domain, so it is not necessary to use locking here. | |
825 | */ | |
a4630c61 | 826 | pm_genpd_sync_poweron(genpd, true); |
596ba34b | 827 | genpd->suspended_count--; |
596ba34b | 828 | |
2b1d88cd | 829 | return genpd_start_dev(genpd, dev); |
596ba34b RW |
830 | } |
831 | ||
832 | /** | |
0496c8ae RW |
833 | * pm_genpd_resume_early - Early resume of a device in an I/O PM domain. |
834 | * @dev: Device to resume. | |
835 | * | |
836 | * Carry out an early resume of a device under the assumption that its | |
837 | * pm_domain field points to the domain member of an object of type | |
838 | * struct generic_pm_domain representing a power domain consisting of I/O | |
839 | * devices. | |
840 | */ | |
841 | static int pm_genpd_resume_early(struct device *dev) | |
842 | { | |
843 | struct generic_pm_domain *genpd; | |
844 | ||
845 | dev_dbg(dev, "%s()\n", __func__); | |
846 | ||
847 | genpd = dev_to_genpd(dev); | |
848 | if (IS_ERR(genpd)) | |
849 | return -EINVAL; | |
850 | ||
1e0407ca | 851 | return genpd->suspend_power_off ? 0 : pm_generic_resume_early(dev); |
0496c8ae RW |
852 | } |
853 | ||
854 | /** | |
855 | * pm_genpd_resume - Resume of device in an I/O PM domain. | |
596ba34b RW |
856 | * @dev: Device to resume. |
857 | * | |
858 | * Resume a device under the assumption that its pm_domain field points to the | |
859 | * domain member of an object of type struct generic_pm_domain representing | |
860 | * a power domain consisting of I/O devices. | |
861 | */ | |
862 | static int pm_genpd_resume(struct device *dev) | |
863 | { | |
864 | struct generic_pm_domain *genpd; | |
865 | ||
866 | dev_dbg(dev, "%s()\n", __func__); | |
867 | ||
868 | genpd = dev_to_genpd(dev); | |
869 | if (IS_ERR(genpd)) | |
870 | return -EINVAL; | |
871 | ||
1e0407ca | 872 | return genpd->suspend_power_off ? 0 : pm_generic_resume(dev); |
596ba34b RW |
873 | } |
874 | ||
875 | /** | |
0496c8ae | 876 | * pm_genpd_freeze - Freezing a device in an I/O PM domain. |
596ba34b RW |
877 | * @dev: Device to freeze. |
878 | * | |
879 | * Freeze a device under the assumption that its pm_domain field points to the | |
880 | * domain member of an object of type struct generic_pm_domain representing | |
881 | * a power domain consisting of I/O devices. | |
882 | */ | |
883 | static int pm_genpd_freeze(struct device *dev) | |
884 | { | |
885 | struct generic_pm_domain *genpd; | |
886 | ||
887 | dev_dbg(dev, "%s()\n", __func__); | |
888 | ||
889 | genpd = dev_to_genpd(dev); | |
890 | if (IS_ERR(genpd)) | |
891 | return -EINVAL; | |
892 | ||
1e0407ca | 893 | return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev); |
596ba34b RW |
894 | } |
895 | ||
896 | /** | |
0496c8ae RW |
897 | * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain. |
898 | * @dev: Device to freeze. | |
899 | * | |
900 | * Carry out a late freeze of a device under the assumption that its | |
901 | * pm_domain field points to the domain member of an object of type | |
902 | * struct generic_pm_domain representing a power domain consisting of I/O | |
903 | * devices. | |
904 | */ | |
905 | static int pm_genpd_freeze_late(struct device *dev) | |
906 | { | |
907 | struct generic_pm_domain *genpd; | |
908 | ||
909 | dev_dbg(dev, "%s()\n", __func__); | |
910 | ||
911 | genpd = dev_to_genpd(dev); | |
912 | if (IS_ERR(genpd)) | |
913 | return -EINVAL; | |
914 | ||
1e0407ca | 915 | return genpd->suspend_power_off ? 0 : pm_generic_freeze_late(dev); |
0496c8ae RW |
916 | } |
917 | ||
918 | /** | |
919 | * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. | |
596ba34b RW |
920 | * @dev: Device to freeze. |
921 | * | |
922 | * Carry out a late freeze of a device under the assumption that its | |
923 | * pm_domain field points to the domain member of an object of type | |
924 | * struct generic_pm_domain representing a power domain consisting of I/O | |
925 | * devices. | |
926 | */ | |
927 | static int pm_genpd_freeze_noirq(struct device *dev) | |
928 | { | |
929 | struct generic_pm_domain *genpd; | |
596ba34b RW |
930 | |
931 | dev_dbg(dev, "%s()\n", __func__); | |
932 | ||
933 | genpd = dev_to_genpd(dev); | |
934 | if (IS_ERR(genpd)) | |
935 | return -EINVAL; | |
936 | ||
2b1d88cd | 937 | return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev); |
0496c8ae | 938 | } |
596ba34b | 939 | |
0496c8ae RW |
940 | /** |
941 | * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. | |
942 | * @dev: Device to thaw. | |
943 | * | |
944 | * Start the device, unless power has been removed from the domain already | |
945 | * before the system transition. | |
946 | */ | |
947 | static int pm_genpd_thaw_noirq(struct device *dev) | |
948 | { | |
949 | struct generic_pm_domain *genpd; | |
596ba34b | 950 | |
0496c8ae | 951 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 952 | |
0496c8ae RW |
953 | genpd = dev_to_genpd(dev); |
954 | if (IS_ERR(genpd)) | |
955 | return -EINVAL; | |
956 | ||
51cda844 | 957 | return genpd->suspend_power_off ? |
2b1d88cd | 958 | 0 : genpd_start_dev(genpd, dev); |
596ba34b RW |
959 | } |
960 | ||
961 | /** | |
0496c8ae | 962 | * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain. |
596ba34b RW |
963 | * @dev: Device to thaw. |
964 | * | |
965 | * Carry out an early thaw of a device under the assumption that its | |
966 | * pm_domain field points to the domain member of an object of type | |
967 | * struct generic_pm_domain representing a power domain consisting of I/O | |
968 | * devices. | |
969 | */ | |
0496c8ae | 970 | static int pm_genpd_thaw_early(struct device *dev) |
596ba34b RW |
971 | { |
972 | struct generic_pm_domain *genpd; | |
973 | ||
974 | dev_dbg(dev, "%s()\n", __func__); | |
975 | ||
976 | genpd = dev_to_genpd(dev); | |
977 | if (IS_ERR(genpd)) | |
978 | return -EINVAL; | |
979 | ||
1e0407ca | 980 | return genpd->suspend_power_off ? 0 : pm_generic_thaw_early(dev); |
596ba34b RW |
981 | } |
982 | ||
983 | /** | |
984 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. | |
985 | * @dev: Device to thaw. | |
986 | * | |
987 | * Thaw a device under the assumption that its pm_domain field points to the | |
988 | * domain member of an object of type struct generic_pm_domain representing | |
989 | * a power domain consisting of I/O devices. | |
990 | */ | |
991 | static int pm_genpd_thaw(struct device *dev) | |
992 | { | |
993 | struct generic_pm_domain *genpd; | |
994 | ||
995 | dev_dbg(dev, "%s()\n", __func__); | |
996 | ||
997 | genpd = dev_to_genpd(dev); | |
998 | if (IS_ERR(genpd)) | |
999 | return -EINVAL; | |
1000 | ||
1e0407ca | 1001 | return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev); |
596ba34b RW |
1002 | } |
1003 | ||
1004 | /** | |
0496c8ae | 1005 | * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1006 | * @dev: Device to resume. |
1007 | * | |
0496c8ae RW |
1008 | * Make sure the domain will be in the same power state as before the |
1009 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b RW |
1010 | */ |
1011 | static int pm_genpd_restore_noirq(struct device *dev) | |
1012 | { | |
1013 | struct generic_pm_domain *genpd; | |
1014 | ||
1015 | dev_dbg(dev, "%s()\n", __func__); | |
1016 | ||
1017 | genpd = dev_to_genpd(dev); | |
1018 | if (IS_ERR(genpd)) | |
1019 | return -EINVAL; | |
1020 | ||
1021 | /* | |
1022 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1023 | * guaranteed that this function will never run twice in parallel for | |
1024 | * the same PM domain, so it is not necessary to use locking here. | |
65533bbf RW |
1025 | * |
1026 | * At this point suspended_count == 0 means we are being run for the | |
1027 | * first time for the given domain in the present cycle. | |
596ba34b | 1028 | */ |
65533bbf | 1029 | if (genpd->suspended_count++ == 0) { |
596ba34b | 1030 | /* |
65533bbf | 1031 | * The boot kernel might put the domain into arbitrary state, |
802d8b49 RW |
1032 | * so make it appear as powered off to pm_genpd_sync_poweron(), |
1033 | * so that it tries to power it on in case it was really off. | |
596ba34b | 1034 | */ |
65533bbf RW |
1035 | genpd->status = GPD_STATE_POWER_OFF; |
1036 | if (genpd->suspend_power_off) { | |
1037 | /* | |
1038 | * If the domain was off before the hibernation, make | |
1039 | * sure it will be off going forward. | |
1040 | */ | |
a4630c61 | 1041 | genpd_power_off(genpd, true); |
65533bbf RW |
1042 | |
1043 | return 0; | |
1044 | } | |
596ba34b RW |
1045 | } |
1046 | ||
18dd2ece RW |
1047 | if (genpd->suspend_power_off) |
1048 | return 0; | |
1049 | ||
a4630c61 | 1050 | pm_genpd_sync_poweron(genpd, true); |
596ba34b | 1051 | |
2b1d88cd | 1052 | return genpd_start_dev(genpd, dev); |
596ba34b RW |
1053 | } |
1054 | ||
1055 | /** | |
1056 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
1057 | * @dev: Device to complete the transition of. | |
1058 | * | |
1059 | * Complete a power transition of a device (during a system-wide power | |
1060 | * transition) under the assumption that its pm_domain field points to the | |
1061 | * domain member of an object of type struct generic_pm_domain representing | |
1062 | * a power domain consisting of I/O devices. | |
1063 | */ | |
1064 | static void pm_genpd_complete(struct device *dev) | |
1065 | { | |
1066 | struct generic_pm_domain *genpd; | |
1067 | bool run_complete; | |
1068 | ||
1069 | dev_dbg(dev, "%s()\n", __func__); | |
1070 | ||
1071 | genpd = dev_to_genpd(dev); | |
1072 | if (IS_ERR(genpd)) | |
1073 | return; | |
1074 | ||
1075 | mutex_lock(&genpd->lock); | |
1076 | ||
1077 | run_complete = !genpd->suspend_power_off; | |
1078 | if (--genpd->prepared_count == 0) | |
1079 | genpd->suspend_power_off = false; | |
1080 | ||
1081 | mutex_unlock(&genpd->lock); | |
1082 | ||
1083 | if (run_complete) { | |
1084 | pm_generic_complete(dev); | |
6f00ff78 | 1085 | pm_runtime_set_active(dev); |
596ba34b | 1086 | pm_runtime_enable(dev); |
af939339 | 1087 | pm_request_idle(dev); |
596ba34b RW |
1088 | } |
1089 | } | |
1090 | ||
77f827de | 1091 | /** |
d47e6464 | 1092 | * genpd_syscore_switch - Switch power during system core suspend or resume. |
77f827de RW |
1093 | * @dev: Device that normally is marked as "always on" to switch power for. |
1094 | * | |
1095 | * This routine may only be called during the system core (syscore) suspend or | |
1096 | * resume phase for devices whose "always on" flags are set. | |
1097 | */ | |
d47e6464 | 1098 | static void genpd_syscore_switch(struct device *dev, bool suspend) |
77f827de RW |
1099 | { |
1100 | struct generic_pm_domain *genpd; | |
1101 | ||
1102 | genpd = dev_to_genpd(dev); | |
1103 | if (!pm_genpd_present(genpd)) | |
1104 | return; | |
1105 | ||
1106 | if (suspend) { | |
1107 | genpd->suspended_count++; | |
a4630c61 | 1108 | pm_genpd_sync_poweroff(genpd, false); |
77f827de | 1109 | } else { |
a4630c61 | 1110 | pm_genpd_sync_poweron(genpd, false); |
77f827de RW |
1111 | genpd->suspended_count--; |
1112 | } | |
1113 | } | |
d47e6464 UH |
1114 | |
1115 | void pm_genpd_syscore_poweroff(struct device *dev) | |
1116 | { | |
1117 | genpd_syscore_switch(dev, true); | |
1118 | } | |
1119 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); | |
1120 | ||
1121 | void pm_genpd_syscore_poweron(struct device *dev) | |
1122 | { | |
1123 | genpd_syscore_switch(dev, false); | |
1124 | } | |
1125 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); | |
77f827de | 1126 | |
d30d819d | 1127 | #else /* !CONFIG_PM_SLEEP */ |
596ba34b RW |
1128 | |
1129 | #define pm_genpd_prepare NULL | |
1130 | #define pm_genpd_suspend NULL | |
0496c8ae | 1131 | #define pm_genpd_suspend_late NULL |
596ba34b | 1132 | #define pm_genpd_suspend_noirq NULL |
0496c8ae | 1133 | #define pm_genpd_resume_early NULL |
596ba34b RW |
1134 | #define pm_genpd_resume_noirq NULL |
1135 | #define pm_genpd_resume NULL | |
1136 | #define pm_genpd_freeze NULL | |
0496c8ae | 1137 | #define pm_genpd_freeze_late NULL |
596ba34b | 1138 | #define pm_genpd_freeze_noirq NULL |
0496c8ae | 1139 | #define pm_genpd_thaw_early NULL |
596ba34b RW |
1140 | #define pm_genpd_thaw_noirq NULL |
1141 | #define pm_genpd_thaw NULL | |
596ba34b | 1142 | #define pm_genpd_restore_noirq NULL |
596ba34b RW |
1143 | #define pm_genpd_complete NULL |
1144 | ||
1145 | #endif /* CONFIG_PM_SLEEP */ | |
1146 | ||
f104e1e5 UH |
1147 | static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, |
1148 | struct generic_pm_domain *genpd, | |
1149 | struct gpd_timing_data *td) | |
1d5fcfec RW |
1150 | { |
1151 | struct generic_pm_domain_data *gpd_data; | |
3e235685 UH |
1152 | int ret; |
1153 | ||
1154 | ret = dev_pm_get_subsys_data(dev); | |
1155 | if (ret) | |
1156 | return ERR_PTR(ret); | |
1d5fcfec RW |
1157 | |
1158 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
3e235685 UH |
1159 | if (!gpd_data) { |
1160 | ret = -ENOMEM; | |
1161 | goto err_put; | |
1162 | } | |
1d5fcfec | 1163 | |
f104e1e5 UH |
1164 | if (td) |
1165 | gpd_data->td = *td; | |
1166 | ||
1167 | gpd_data->base.dev = dev; | |
f104e1e5 UH |
1168 | gpd_data->td.constraint_changed = true; |
1169 | gpd_data->td.effective_constraint_ns = -1; | |
1170 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; | |
1171 | ||
1172 | spin_lock_irq(&dev->power.lock); | |
1173 | ||
1174 | if (dev->power.subsys_data->domain_data) { | |
1175 | ret = -EINVAL; | |
1176 | goto err_free; | |
1177 | } | |
1178 | ||
1179 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
1180 | dev->pm_domain = &genpd->domain; | |
1181 | ||
1182 | spin_unlock_irq(&dev->power.lock); | |
1183 | ||
1d5fcfec | 1184 | return gpd_data; |
3e235685 | 1185 | |
f104e1e5 UH |
1186 | err_free: |
1187 | spin_unlock_irq(&dev->power.lock); | |
1188 | kfree(gpd_data); | |
3e235685 UH |
1189 | err_put: |
1190 | dev_pm_put_subsys_data(dev); | |
1191 | return ERR_PTR(ret); | |
1d5fcfec RW |
1192 | } |
1193 | ||
49d400c7 UH |
1194 | static void genpd_free_dev_data(struct device *dev, |
1195 | struct generic_pm_domain_data *gpd_data) | |
1d5fcfec | 1196 | { |
f104e1e5 UH |
1197 | spin_lock_irq(&dev->power.lock); |
1198 | ||
1199 | dev->pm_domain = NULL; | |
1200 | dev->power.subsys_data->domain_data = NULL; | |
1201 | ||
1202 | spin_unlock_irq(&dev->power.lock); | |
1203 | ||
1d5fcfec | 1204 | kfree(gpd_data); |
3e235685 | 1205 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1206 | } |
1207 | ||
f721889f | 1208 | /** |
b02c999a | 1209 | * __pm_genpd_add_device - Add a device to an I/O PM domain. |
f721889f RW |
1210 | * @genpd: PM domain to add the device to. |
1211 | * @dev: Device to be added. | |
b02c999a | 1212 | * @td: Set of PM QoS timing parameters to attach to the device. |
f721889f | 1213 | */ |
b02c999a RW |
1214 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1215 | struct gpd_timing_data *td) | |
f721889f | 1216 | { |
c0356db7 | 1217 | struct generic_pm_domain_data *gpd_data; |
f721889f RW |
1218 | int ret = 0; |
1219 | ||
1220 | dev_dbg(dev, "%s()\n", __func__); | |
1221 | ||
1222 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1223 | return -EINVAL; | |
1224 | ||
f104e1e5 | 1225 | gpd_data = genpd_alloc_dev_data(dev, genpd, td); |
3e235685 UH |
1226 | if (IS_ERR(gpd_data)) |
1227 | return PTR_ERR(gpd_data); | |
6ff7bb0d | 1228 | |
ba2bbfbf | 1229 | mutex_lock(&genpd->lock); |
f721889f | 1230 | |
596ba34b RW |
1231 | if (genpd->prepared_count > 0) { |
1232 | ret = -EAGAIN; | |
1233 | goto out; | |
1234 | } | |
1235 | ||
b472c2fa UH |
1236 | ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
1237 | if (ret) | |
1238 | goto out; | |
d79b6fe1 | 1239 | |
14b53064 UH |
1240 | genpd->device_count++; |
1241 | genpd->max_off_time_changed = true; | |
1242 | ||
1d5fcfec | 1243 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
6ff7bb0d | 1244 | |
f721889f | 1245 | out: |
ba2bbfbf | 1246 | mutex_unlock(&genpd->lock); |
f721889f | 1247 | |
c0356db7 UH |
1248 | if (ret) |
1249 | genpd_free_dev_data(dev, gpd_data); | |
1250 | else | |
1251 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1d5fcfec | 1252 | |
f721889f RW |
1253 | return ret; |
1254 | } | |
1255 | ||
1256 | /** | |
1257 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1258 | * @genpd: PM domain to remove the device from. | |
1259 | * @dev: Device to be removed. | |
1260 | */ | |
1261 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1262 | struct device *dev) | |
1263 | { | |
6ff7bb0d | 1264 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1265 | struct pm_domain_data *pdd; |
efa69025 | 1266 | int ret = 0; |
f721889f RW |
1267 | |
1268 | dev_dbg(dev, "%s()\n", __func__); | |
1269 | ||
df6a0d6f | 1270 | if (!genpd || genpd != pm_genpd_lookup_dev(dev)) |
f721889f RW |
1271 | return -EINVAL; |
1272 | ||
c0356db7 UH |
1273 | /* The above validation also means we have existing domain_data. */ |
1274 | pdd = dev->power.subsys_data->domain_data; | |
1275 | gpd_data = to_gpd_data(pdd); | |
1276 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
1277 | ||
ba2bbfbf | 1278 | mutex_lock(&genpd->lock); |
f721889f | 1279 | |
596ba34b RW |
1280 | if (genpd->prepared_count > 0) { |
1281 | ret = -EAGAIN; | |
1282 | goto out; | |
1283 | } | |
1284 | ||
6ff7bb0d RW |
1285 | genpd->device_count--; |
1286 | genpd->max_off_time_changed = true; | |
1287 | ||
d79b6fe1 | 1288 | if (genpd->detach_dev) |
c16561e8 | 1289 | genpd->detach_dev(genpd, dev); |
d79b6fe1 | 1290 | |
efa69025 | 1291 | list_del_init(&pdd->list_node); |
6ff7bb0d | 1292 | |
ba2bbfbf | 1293 | mutex_unlock(&genpd->lock); |
6ff7bb0d | 1294 | |
c1dbe2fb | 1295 | genpd_free_dev_data(dev, gpd_data); |
1d5fcfec | 1296 | |
6ff7bb0d | 1297 | return 0; |
f721889f | 1298 | |
596ba34b | 1299 | out: |
ba2bbfbf | 1300 | mutex_unlock(&genpd->lock); |
c0356db7 | 1301 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); |
f721889f RW |
1302 | |
1303 | return ret; | |
1304 | } | |
1305 | ||
1306 | /** | |
1307 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1308 | * @genpd: Master PM domain to add the subdomain to. | |
bc0403ff | 1309 | * @subdomain: Subdomain to be added. |
f721889f RW |
1310 | */ |
1311 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
bc0403ff | 1312 | struct generic_pm_domain *subdomain) |
f721889f | 1313 | { |
2547923d | 1314 | struct gpd_link *link, *itr; |
f721889f RW |
1315 | int ret = 0; |
1316 | ||
fb7268be RW |
1317 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1318 | || genpd == subdomain) | |
f721889f RW |
1319 | return -EINVAL; |
1320 | ||
2547923d LI |
1321 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1322 | if (!link) | |
1323 | return -ENOMEM; | |
1324 | ||
ba2bbfbf | 1325 | mutex_lock(&genpd->lock); |
bc0403ff | 1326 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); |
f721889f | 1327 | |
17b75eca | 1328 | if (genpd->status == GPD_STATE_POWER_OFF |
bc0403ff | 1329 | && subdomain->status != GPD_STATE_POWER_OFF) { |
f721889f RW |
1330 | ret = -EINVAL; |
1331 | goto out; | |
1332 | } | |
1333 | ||
2547923d LI |
1334 | list_for_each_entry(itr, &genpd->master_links, master_node) { |
1335 | if (itr->slave == subdomain && itr->master == genpd) { | |
f721889f RW |
1336 | ret = -EINVAL; |
1337 | goto out; | |
1338 | } | |
1339 | } | |
1340 | ||
5063ce15 RW |
1341 | link->master = genpd; |
1342 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1343 | link->slave = subdomain; |
1344 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
1345 | if (subdomain->status != GPD_STATE_POWER_OFF) | |
c4bb3160 | 1346 | genpd_sd_counter_inc(genpd); |
f721889f | 1347 | |
f721889f | 1348 | out: |
bc0403ff | 1349 | mutex_unlock(&subdomain->lock); |
ba2bbfbf | 1350 | mutex_unlock(&genpd->lock); |
2547923d LI |
1351 | if (ret) |
1352 | kfree(link); | |
f721889f RW |
1353 | return ret; |
1354 | } | |
1355 | ||
1356 | /** | |
1357 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1358 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1359 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1360 | */ |
1361 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1362 | struct generic_pm_domain *subdomain) |
f721889f | 1363 | { |
5063ce15 | 1364 | struct gpd_link *link; |
f721889f RW |
1365 | int ret = -EINVAL; |
1366 | ||
5063ce15 | 1367 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1368 | return -EINVAL; |
1369 | ||
ba2bbfbf | 1370 | mutex_lock(&genpd->lock); |
f721889f | 1371 | |
30e7a65b JH |
1372 | if (!list_empty(&subdomain->slave_links) || subdomain->device_count) { |
1373 | pr_warn("%s: unable to remove subdomain %s\n", genpd->name, | |
1374 | subdomain->name); | |
1375 | ret = -EBUSY; | |
1376 | goto out; | |
1377 | } | |
1378 | ||
5063ce15 RW |
1379 | list_for_each_entry(link, &genpd->master_links, master_node) { |
1380 | if (link->slave != subdomain) | |
f721889f RW |
1381 | continue; |
1382 | ||
1383 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); | |
1384 | ||
5063ce15 RW |
1385 | list_del(&link->master_node); |
1386 | list_del(&link->slave_node); | |
1387 | kfree(link); | |
17b75eca | 1388 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1389 | genpd_sd_counter_dec(genpd); |
1390 | ||
1391 | mutex_unlock(&subdomain->lock); | |
1392 | ||
1393 | ret = 0; | |
1394 | break; | |
1395 | } | |
1396 | ||
30e7a65b | 1397 | out: |
ba2bbfbf | 1398 | mutex_unlock(&genpd->lock); |
f721889f RW |
1399 | |
1400 | return ret; | |
1401 | } | |
1402 | ||
d23b9b00 RW |
1403 | /* Default device callbacks for generic PM domains. */ |
1404 | ||
ecf00475 | 1405 | /** |
12e10bb6 | 1406 | * pm_genpd_default_save_state - Default "save device state" for PM domains. |
ecf00475 RW |
1407 | * @dev: Device to handle. |
1408 | */ | |
1409 | static int pm_genpd_default_save_state(struct device *dev) | |
1410 | { | |
1411 | int (*cb)(struct device *__dev); | |
ecf00475 | 1412 | |
0b589741 RW |
1413 | if (dev->type && dev->type->pm) |
1414 | cb = dev->type->pm->runtime_suspend; | |
1415 | else if (dev->class && dev->class->pm) | |
1416 | cb = dev->class->pm->runtime_suspend; | |
1417 | else if (dev->bus && dev->bus->pm) | |
1418 | cb = dev->bus->pm->runtime_suspend; | |
1419 | else | |
1420 | cb = NULL; | |
ecf00475 | 1421 | |
0b589741 RW |
1422 | if (!cb && dev->driver && dev->driver->pm) |
1423 | cb = dev->driver->pm->runtime_suspend; | |
1424 | ||
1425 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1426 | } |
1427 | ||
1428 | /** | |
12e10bb6 | 1429 | * pm_genpd_default_restore_state - Default PM domains "restore device state". |
ecf00475 RW |
1430 | * @dev: Device to handle. |
1431 | */ | |
1432 | static int pm_genpd_default_restore_state(struct device *dev) | |
1433 | { | |
1434 | int (*cb)(struct device *__dev); | |
ecf00475 | 1435 | |
0b589741 RW |
1436 | if (dev->type && dev->type->pm) |
1437 | cb = dev->type->pm->runtime_resume; | |
1438 | else if (dev->class && dev->class->pm) | |
1439 | cb = dev->class->pm->runtime_resume; | |
1440 | else if (dev->bus && dev->bus->pm) | |
1441 | cb = dev->bus->pm->runtime_resume; | |
1442 | else | |
1443 | cb = NULL; | |
ecf00475 | 1444 | |
0b589741 RW |
1445 | if (!cb && dev->driver && dev->driver->pm) |
1446 | cb = dev->driver->pm->runtime_resume; | |
1447 | ||
1448 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1449 | } |
1450 | ||
f721889f RW |
1451 | /** |
1452 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1453 | * @genpd: PM domain object to initialize. | |
1454 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1455 | * @is_off: Initial value of the domain's power_is_off field. | |
1456 | */ | |
1457 | void pm_genpd_init(struct generic_pm_domain *genpd, | |
1458 | struct dev_power_governor *gov, bool is_off) | |
1459 | { | |
1460 | if (IS_ERR_OR_NULL(genpd)) | |
1461 | return; | |
1462 | ||
5063ce15 RW |
1463 | INIT_LIST_HEAD(&genpd->master_links); |
1464 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1465 | INIT_LIST_HEAD(&genpd->dev_list); |
f721889f RW |
1466 | mutex_init(&genpd->lock); |
1467 | genpd->gov = gov; | |
1468 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
c4bb3160 | 1469 | atomic_set(&genpd->sd_count, 0); |
17b75eca | 1470 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
596ba34b | 1471 | genpd->device_count = 0; |
221e9b58 | 1472 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1473 | genpd->max_off_time_changed = true; |
f721889f RW |
1474 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
1475 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; | |
596ba34b RW |
1476 | genpd->domain.ops.prepare = pm_genpd_prepare; |
1477 | genpd->domain.ops.suspend = pm_genpd_suspend; | |
0496c8ae | 1478 | genpd->domain.ops.suspend_late = pm_genpd_suspend_late; |
596ba34b RW |
1479 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; |
1480 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
0496c8ae | 1481 | genpd->domain.ops.resume_early = pm_genpd_resume_early; |
596ba34b RW |
1482 | genpd->domain.ops.resume = pm_genpd_resume; |
1483 | genpd->domain.ops.freeze = pm_genpd_freeze; | |
0496c8ae | 1484 | genpd->domain.ops.freeze_late = pm_genpd_freeze_late; |
596ba34b RW |
1485 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; |
1486 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
0496c8ae | 1487 | genpd->domain.ops.thaw_early = pm_genpd_thaw_early; |
596ba34b | 1488 | genpd->domain.ops.thaw = pm_genpd_thaw; |
d23b9b00 | 1489 | genpd->domain.ops.poweroff = pm_genpd_suspend; |
0496c8ae | 1490 | genpd->domain.ops.poweroff_late = pm_genpd_suspend_late; |
d23b9b00 | 1491 | genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; |
596ba34b | 1492 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
0496c8ae | 1493 | genpd->domain.ops.restore_early = pm_genpd_resume_early; |
d23b9b00 | 1494 | genpd->domain.ops.restore = pm_genpd_resume; |
596ba34b | 1495 | genpd->domain.ops.complete = pm_genpd_complete; |
ecf00475 RW |
1496 | genpd->dev_ops.save_state = pm_genpd_default_save_state; |
1497 | genpd->dev_ops.restore_state = pm_genpd_default_restore_state; | |
c11f6f5b UH |
1498 | |
1499 | if (genpd->flags & GENPD_FLAG_PM_CLK) { | |
1500 | genpd->dev_ops.stop = pm_clk_suspend; | |
1501 | genpd->dev_ops.start = pm_clk_resume; | |
1502 | } | |
1503 | ||
5125bbf3 RW |
1504 | mutex_lock(&gpd_list_lock); |
1505 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1506 | mutex_unlock(&gpd_list_lock); | |
1507 | } | |
be5ed55d | 1508 | EXPORT_SYMBOL_GPL(pm_genpd_init); |
aa42240a TF |
1509 | |
1510 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF | |
1511 | /* | |
1512 | * Device Tree based PM domain providers. | |
1513 | * | |
1514 | * The code below implements generic device tree based PM domain providers that | |
1515 | * bind device tree nodes with generic PM domains registered in the system. | |
1516 | * | |
1517 | * Any driver that registers generic PM domains and needs to support binding of | |
1518 | * devices to these domains is supposed to register a PM domain provider, which | |
1519 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
1520 | * | |
1521 | * Two simple mapping functions have been provided for convenience: | |
1522 | * - __of_genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. | |
1523 | * - __of_genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
1524 | * index. | |
1525 | */ | |
1526 | ||
1527 | /** | |
1528 | * struct of_genpd_provider - PM domain provider registration structure | |
1529 | * @link: Entry in global list of PM domain providers | |
1530 | * @node: Pointer to device tree node of PM domain provider | |
1531 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
1532 | * into a PM domain. | |
1533 | * @data: context pointer to be passed into @xlate callback | |
1534 | */ | |
1535 | struct of_genpd_provider { | |
1536 | struct list_head link; | |
1537 | struct device_node *node; | |
1538 | genpd_xlate_t xlate; | |
1539 | void *data; | |
1540 | }; | |
1541 | ||
1542 | /* List of registered PM domain providers. */ | |
1543 | static LIST_HEAD(of_genpd_providers); | |
1544 | /* Mutex to protect the list above. */ | |
1545 | static DEFINE_MUTEX(of_genpd_mutex); | |
1546 | ||
1547 | /** | |
1548 | * __of_genpd_xlate_simple() - Xlate function for direct node-domain mapping | |
1549 | * @genpdspec: OF phandle args to map into a PM domain | |
1550 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
1551 | * | |
1552 | * This is a generic xlate function that can be used to model PM domains that | |
1553 | * have their own device tree nodes. The private data of xlate function needs | |
1554 | * to be a valid pointer to struct generic_pm_domain. | |
1555 | */ | |
1556 | struct generic_pm_domain *__of_genpd_xlate_simple( | |
1557 | struct of_phandle_args *genpdspec, | |
1558 | void *data) | |
1559 | { | |
1560 | if (genpdspec->args_count != 0) | |
1561 | return ERR_PTR(-EINVAL); | |
1562 | return data; | |
1563 | } | |
1564 | EXPORT_SYMBOL_GPL(__of_genpd_xlate_simple); | |
1565 | ||
1566 | /** | |
1567 | * __of_genpd_xlate_onecell() - Xlate function using a single index. | |
1568 | * @genpdspec: OF phandle args to map into a PM domain | |
1569 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
1570 | * | |
1571 | * This is a generic xlate function that can be used to model simple PM domain | |
1572 | * controllers that have one device tree node and provide multiple PM domains. | |
1573 | * A single cell is used as an index into an array of PM domains specified in | |
1574 | * the genpd_onecell_data struct when registering the provider. | |
1575 | */ | |
1576 | struct generic_pm_domain *__of_genpd_xlate_onecell( | |
1577 | struct of_phandle_args *genpdspec, | |
1578 | void *data) | |
1579 | { | |
1580 | struct genpd_onecell_data *genpd_data = data; | |
1581 | unsigned int idx = genpdspec->args[0]; | |
1582 | ||
1583 | if (genpdspec->args_count != 1) | |
1584 | return ERR_PTR(-EINVAL); | |
1585 | ||
1586 | if (idx >= genpd_data->num_domains) { | |
1587 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
1588 | return ERR_PTR(-EINVAL); | |
1589 | } | |
1590 | ||
1591 | if (!genpd_data->domains[idx]) | |
1592 | return ERR_PTR(-ENOENT); | |
1593 | ||
1594 | return genpd_data->domains[idx]; | |
1595 | } | |
1596 | EXPORT_SYMBOL_GPL(__of_genpd_xlate_onecell); | |
1597 | ||
1598 | /** | |
1599 | * __of_genpd_add_provider() - Register a PM domain provider for a node | |
1600 | * @np: Device node pointer associated with the PM domain provider. | |
1601 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
1602 | * @data: Context pointer for @xlate callback. | |
1603 | */ | |
1604 | int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, | |
1605 | void *data) | |
1606 | { | |
1607 | struct of_genpd_provider *cp; | |
1608 | ||
1609 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
1610 | if (!cp) | |
1611 | return -ENOMEM; | |
1612 | ||
1613 | cp->node = of_node_get(np); | |
1614 | cp->data = data; | |
1615 | cp->xlate = xlate; | |
1616 | ||
1617 | mutex_lock(&of_genpd_mutex); | |
1618 | list_add(&cp->link, &of_genpd_providers); | |
1619 | mutex_unlock(&of_genpd_mutex); | |
1620 | pr_debug("Added domain provider from %s\n", np->full_name); | |
1621 | ||
1622 | return 0; | |
1623 | } | |
1624 | EXPORT_SYMBOL_GPL(__of_genpd_add_provider); | |
1625 | ||
1626 | /** | |
1627 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
1628 | * @np: Device node pointer associated with the PM domain provider | |
1629 | */ | |
1630 | void of_genpd_del_provider(struct device_node *np) | |
1631 | { | |
1632 | struct of_genpd_provider *cp; | |
1633 | ||
1634 | mutex_lock(&of_genpd_mutex); | |
1635 | list_for_each_entry(cp, &of_genpd_providers, link) { | |
1636 | if (cp->node == np) { | |
1637 | list_del(&cp->link); | |
1638 | of_node_put(cp->node); | |
1639 | kfree(cp); | |
1640 | break; | |
1641 | } | |
1642 | } | |
1643 | mutex_unlock(&of_genpd_mutex); | |
1644 | } | |
1645 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
1646 | ||
1647 | /** | |
1648 | * of_genpd_get_from_provider() - Look-up PM domain | |
1649 | * @genpdspec: OF phandle args to use for look-up | |
1650 | * | |
1651 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
1652 | * found, uses xlate function of the provider to map phandle args to a PM | |
1653 | * domain. | |
1654 | * | |
1655 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
1656 | * on failure. | |
1657 | */ | |
7496fcbe | 1658 | struct generic_pm_domain *of_genpd_get_from_provider( |
aa42240a TF |
1659 | struct of_phandle_args *genpdspec) |
1660 | { | |
1661 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
1662 | struct of_genpd_provider *provider; | |
1663 | ||
1664 | mutex_lock(&of_genpd_mutex); | |
1665 | ||
1666 | /* Check if we have such a provider in our array */ | |
1667 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
1668 | if (provider->node == genpdspec->np) | |
1669 | genpd = provider->xlate(genpdspec, provider->data); | |
1670 | if (!IS_ERR(genpd)) | |
1671 | break; | |
1672 | } | |
1673 | ||
1674 | mutex_unlock(&of_genpd_mutex); | |
1675 | ||
1676 | return genpd; | |
1677 | } | |
7496fcbe | 1678 | EXPORT_SYMBOL_GPL(of_genpd_get_from_provider); |
aa42240a TF |
1679 | |
1680 | /** | |
1681 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
8bb6944e | 1682 | * @dev: Device to detach. |
aa42240a TF |
1683 | * @power_off: Currently not used |
1684 | * | |
1685 | * Try to locate a corresponding generic PM domain, which the device was | |
1686 | * attached to previously. If such is found, the device is detached from it. | |
1687 | */ | |
1688 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
1689 | { | |
446d999c | 1690 | struct generic_pm_domain *pd; |
93af5e93 | 1691 | unsigned int i; |
aa42240a TF |
1692 | int ret = 0; |
1693 | ||
446d999c | 1694 | pd = pm_genpd_lookup_dev(dev); |
aa42240a TF |
1695 | if (!pd) |
1696 | return; | |
1697 | ||
1698 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
1699 | ||
93af5e93 | 1700 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
aa42240a TF |
1701 | ret = pm_genpd_remove_device(pd, dev); |
1702 | if (ret != -EAGAIN) | |
1703 | break; | |
93af5e93 GU |
1704 | |
1705 | mdelay(i); | |
aa42240a TF |
1706 | cond_resched(); |
1707 | } | |
1708 | ||
1709 | if (ret < 0) { | |
1710 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
1711 | pd->name, ret); | |
1712 | return; | |
1713 | } | |
1714 | ||
1715 | /* Check if PM domain can be powered off after removing this device. */ | |
1716 | genpd_queue_power_off_work(pd); | |
1717 | } | |
1718 | ||
632f7ce3 RK |
1719 | static void genpd_dev_pm_sync(struct device *dev) |
1720 | { | |
1721 | struct generic_pm_domain *pd; | |
1722 | ||
1723 | pd = dev_to_genpd(dev); | |
1724 | if (IS_ERR(pd)) | |
1725 | return; | |
1726 | ||
1727 | genpd_queue_power_off_work(pd); | |
1728 | } | |
1729 | ||
aa42240a TF |
1730 | /** |
1731 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
1732 | * @dev: Device to attach. | |
1733 | * | |
1734 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
1735 | * attaches the device to retrieved pm_domain ops. | |
1736 | * | |
1737 | * Both generic and legacy Samsung-specific DT bindings are supported to keep | |
1738 | * backwards compatibility with existing DTBs. | |
1739 | * | |
311fa6ad JH |
1740 | * Returns 0 on successfully attached PM domain or negative error code. Note |
1741 | * that if a power-domain exists for the device, but it cannot be found or | |
1742 | * turned on, then return -EPROBE_DEFER to ensure that the device is not | |
1743 | * probed and to re-try again later. | |
aa42240a TF |
1744 | */ |
1745 | int genpd_dev_pm_attach(struct device *dev) | |
1746 | { | |
1747 | struct of_phandle_args pd_args; | |
1748 | struct generic_pm_domain *pd; | |
93af5e93 | 1749 | unsigned int i; |
aa42240a TF |
1750 | int ret; |
1751 | ||
1752 | if (!dev->of_node) | |
1753 | return -ENODEV; | |
1754 | ||
1755 | if (dev->pm_domain) | |
1756 | return -EEXIST; | |
1757 | ||
1758 | ret = of_parse_phandle_with_args(dev->of_node, "power-domains", | |
1759 | "#power-domain-cells", 0, &pd_args); | |
1760 | if (ret < 0) { | |
1761 | if (ret != -ENOENT) | |
1762 | return ret; | |
1763 | ||
1764 | /* | |
1765 | * Try legacy Samsung-specific bindings | |
1766 | * (for backwards compatibility of DT ABI) | |
1767 | */ | |
1768 | pd_args.args_count = 0; | |
1769 | pd_args.np = of_parse_phandle(dev->of_node, | |
1770 | "samsung,power-domain", 0); | |
1771 | if (!pd_args.np) | |
1772 | return -ENOENT; | |
1773 | } | |
1774 | ||
1775 | pd = of_genpd_get_from_provider(&pd_args); | |
1776 | if (IS_ERR(pd)) { | |
1777 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", | |
1778 | __func__, PTR_ERR(pd)); | |
1779 | of_node_put(dev->of_node); | |
311fa6ad | 1780 | return -EPROBE_DEFER; |
aa42240a TF |
1781 | } |
1782 | ||
1783 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
1784 | ||
93af5e93 | 1785 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
aa42240a TF |
1786 | ret = pm_genpd_add_device(pd, dev); |
1787 | if (ret != -EAGAIN) | |
1788 | break; | |
93af5e93 GU |
1789 | |
1790 | mdelay(i); | |
aa42240a TF |
1791 | cond_resched(); |
1792 | } | |
1793 | ||
1794 | if (ret < 0) { | |
1795 | dev_err(dev, "failed to add to PM domain %s: %d", | |
1796 | pd->name, ret); | |
1797 | of_node_put(dev->of_node); | |
311fa6ad | 1798 | goto out; |
aa42240a TF |
1799 | } |
1800 | ||
1801 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
632f7ce3 | 1802 | dev->pm_domain->sync = genpd_dev_pm_sync; |
7420aa4f | 1803 | ret = genpd_poweron(pd); |
aa42240a | 1804 | |
311fa6ad JH |
1805 | out: |
1806 | return ret ? -EPROBE_DEFER : 0; | |
aa42240a TF |
1807 | } |
1808 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); | |
d30d819d | 1809 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
2bd5306a MM |
1810 | |
1811 | ||
1812 | /*** debugfs support ***/ | |
1813 | ||
1814 | #ifdef CONFIG_PM_ADVANCED_DEBUG | |
1815 | #include <linux/pm.h> | |
1816 | #include <linux/device.h> | |
1817 | #include <linux/debugfs.h> | |
1818 | #include <linux/seq_file.h> | |
1819 | #include <linux/init.h> | |
1820 | #include <linux/kobject.h> | |
1821 | static struct dentry *pm_genpd_debugfs_dir; | |
1822 | ||
1823 | /* | |
1824 | * TODO: This function is a slightly modified version of rtpm_status_show | |
d30d819d | 1825 | * from sysfs.c, so generalize it. |
2bd5306a | 1826 | */ |
2bd5306a MM |
1827 | static void rtpm_status_str(struct seq_file *s, struct device *dev) |
1828 | { | |
1829 | static const char * const status_lookup[] = { | |
1830 | [RPM_ACTIVE] = "active", | |
1831 | [RPM_RESUMING] = "resuming", | |
1832 | [RPM_SUSPENDED] = "suspended", | |
1833 | [RPM_SUSPENDING] = "suspending" | |
1834 | }; | |
1835 | const char *p = ""; | |
1836 | ||
1837 | if (dev->power.runtime_error) | |
1838 | p = "error"; | |
1839 | else if (dev->power.disable_depth) | |
1840 | p = "unsupported"; | |
1841 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
1842 | p = status_lookup[dev->power.runtime_status]; | |
1843 | else | |
1844 | WARN_ON(1); | |
1845 | ||
1846 | seq_puts(s, p); | |
1847 | } | |
2bd5306a MM |
1848 | |
1849 | static int pm_genpd_summary_one(struct seq_file *s, | |
66a5ca4b | 1850 | struct generic_pm_domain *genpd) |
2bd5306a MM |
1851 | { |
1852 | static const char * const status_lookup[] = { | |
1853 | [GPD_STATE_ACTIVE] = "on", | |
2bd5306a MM |
1854 | [GPD_STATE_POWER_OFF] = "off" |
1855 | }; | |
1856 | struct pm_domain_data *pm_data; | |
1857 | const char *kobj_path; | |
1858 | struct gpd_link *link; | |
1859 | int ret; | |
1860 | ||
66a5ca4b | 1861 | ret = mutex_lock_interruptible(&genpd->lock); |
2bd5306a MM |
1862 | if (ret) |
1863 | return -ERESTARTSYS; | |
1864 | ||
66a5ca4b | 1865 | if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
2bd5306a | 1866 | goto exit; |
15dec67a | 1867 | seq_printf(s, "%-30s %-15s ", genpd->name, status_lookup[genpd->status]); |
2bd5306a MM |
1868 | |
1869 | /* | |
1870 | * Modifications on the list require holding locks on both | |
1871 | * master and slave, so we are safe. | |
66a5ca4b | 1872 | * Also genpd->name is immutable. |
2bd5306a | 1873 | */ |
66a5ca4b | 1874 | list_for_each_entry(link, &genpd->master_links, master_node) { |
2bd5306a | 1875 | seq_printf(s, "%s", link->slave->name); |
66a5ca4b | 1876 | if (!list_is_last(&link->master_node, &genpd->master_links)) |
2bd5306a MM |
1877 | seq_puts(s, ", "); |
1878 | } | |
1879 | ||
66a5ca4b | 1880 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
2bd5306a MM |
1881 | kobj_path = kobject_get_path(&pm_data->dev->kobj, GFP_KERNEL); |
1882 | if (kobj_path == NULL) | |
1883 | continue; | |
1884 | ||
1885 | seq_printf(s, "\n %-50s ", kobj_path); | |
1886 | rtpm_status_str(s, pm_data->dev); | |
1887 | kfree(kobj_path); | |
1888 | } | |
1889 | ||
1890 | seq_puts(s, "\n"); | |
1891 | exit: | |
66a5ca4b | 1892 | mutex_unlock(&genpd->lock); |
2bd5306a MM |
1893 | |
1894 | return 0; | |
1895 | } | |
1896 | ||
1897 | static int pm_genpd_summary_show(struct seq_file *s, void *data) | |
1898 | { | |
66a5ca4b | 1899 | struct generic_pm_domain *genpd; |
2bd5306a MM |
1900 | int ret = 0; |
1901 | ||
15dec67a GU |
1902 | seq_puts(s, "domain status slaves\n"); |
1903 | seq_puts(s, " /device runtime status\n"); | |
2bd5306a MM |
1904 | seq_puts(s, "----------------------------------------------------------------------\n"); |
1905 | ||
1906 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
1907 | if (ret) | |
1908 | return -ERESTARTSYS; | |
1909 | ||
66a5ca4b KH |
1910 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
1911 | ret = pm_genpd_summary_one(s, genpd); | |
2bd5306a MM |
1912 | if (ret) |
1913 | break; | |
1914 | } | |
1915 | mutex_unlock(&gpd_list_lock); | |
1916 | ||
1917 | return ret; | |
1918 | } | |
1919 | ||
1920 | static int pm_genpd_summary_open(struct inode *inode, struct file *file) | |
1921 | { | |
1922 | return single_open(file, pm_genpd_summary_show, NULL); | |
1923 | } | |
1924 | ||
1925 | static const struct file_operations pm_genpd_summary_fops = { | |
1926 | .open = pm_genpd_summary_open, | |
1927 | .read = seq_read, | |
1928 | .llseek = seq_lseek, | |
1929 | .release = single_release, | |
1930 | }; | |
1931 | ||
1932 | static int __init pm_genpd_debug_init(void) | |
1933 | { | |
1934 | struct dentry *d; | |
1935 | ||
1936 | pm_genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); | |
1937 | ||
1938 | if (!pm_genpd_debugfs_dir) | |
1939 | return -ENOMEM; | |
1940 | ||
1941 | d = debugfs_create_file("pm_genpd_summary", S_IRUGO, | |
1942 | pm_genpd_debugfs_dir, NULL, &pm_genpd_summary_fops); | |
1943 | if (!d) | |
1944 | return -ENOMEM; | |
1945 | ||
1946 | return 0; | |
1947 | } | |
1948 | late_initcall(pm_genpd_debug_init); | |
1949 | ||
1950 | static void __exit pm_genpd_debug_exit(void) | |
1951 | { | |
1952 | debugfs_remove_recursive(pm_genpd_debugfs_dir); | |
1953 | } | |
1954 | __exitcall(pm_genpd_debug_exit); | |
1955 | #endif /* CONFIG_PM_ADVANCED_DEBUG */ |