Commit | Line | Data |
---|---|---|
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 | |
0140d8bd RW |
37 | #define GENPD_DEV_TIMED_CALLBACK(genpd, type, callback, dev, field, name) \ |
38 | ({ \ | |
39 | ktime_t __start = ktime_get(); \ | |
40 | type __retval = GENPD_DEV_CALLBACK(genpd, type, callback, dev); \ | |
41 | s64 __elapsed = ktime_to_ns(ktime_sub(ktime_get(), __start)); \ | |
6ff7bb0d RW |
42 | struct gpd_timing_data *__td = &dev_gpd_data(dev)->td; \ |
43 | if (!__retval && __elapsed > __td->field) { \ | |
44 | __td->field = __elapsed; \ | |
7d1af287 | 45 | dev_dbg(dev, name " latency exceeded, new value %lld ns\n", \ |
0140d8bd | 46 | __elapsed); \ |
6ff7bb0d RW |
47 | genpd->max_off_time_changed = true; \ |
48 | __td->constraint_changed = true; \ | |
0140d8bd RW |
49 | } \ |
50 | __retval; \ | |
51 | }) | |
52 | ||
5125bbf3 RW |
53 | static LIST_HEAD(gpd_list); |
54 | static DEFINE_MUTEX(gpd_list_lock); | |
55 | ||
8bc0251d RW |
56 | static struct generic_pm_domain *pm_genpd_lookup_name(const char *domain_name) |
57 | { | |
58 | struct generic_pm_domain *genpd = NULL, *gpd; | |
59 | ||
60 | if (IS_ERR_OR_NULL(domain_name)) | |
61 | return NULL; | |
62 | ||
63 | mutex_lock(&gpd_list_lock); | |
64 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
65 | if (!strcmp(gpd->name, domain_name)) { | |
66 | genpd = gpd; | |
67 | break; | |
68 | } | |
69 | } | |
70 | mutex_unlock(&gpd_list_lock); | |
71 | return genpd; | |
72 | } | |
73 | ||
446d999c RK |
74 | /* |
75 | * Get the generic PM domain for a particular struct device. | |
76 | * This validates the struct device pointer, the PM domain pointer, | |
77 | * and checks that the PM domain pointer is a real generic PM domain. | |
78 | * Any failure results in NULL being returned. | |
79 | */ | |
80 | struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev) | |
81 | { | |
82 | struct generic_pm_domain *genpd = NULL, *gpd; | |
83 | ||
84 | if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain)) | |
85 | return NULL; | |
86 | ||
87 | mutex_lock(&gpd_list_lock); | |
88 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
89 | if (&gpd->domain == dev->pm_domain) { | |
90 | genpd = gpd; | |
91 | break; | |
92 | } | |
93 | } | |
94 | mutex_unlock(&gpd_list_lock); | |
95 | ||
96 | return genpd; | |
97 | } | |
98 | ||
99 | /* | |
100 | * This should only be used where we are certain that the pm_domain | |
101 | * attached to the device is a genpd domain. | |
102 | */ | |
103 | static struct generic_pm_domain *dev_to_genpd(struct device *dev) | |
5248051b RW |
104 | { |
105 | if (IS_ERR_OR_NULL(dev->pm_domain)) | |
106 | return ERR_PTR(-EINVAL); | |
107 | ||
596ba34b | 108 | return pd_to_genpd(dev->pm_domain); |
5248051b | 109 | } |
f721889f | 110 | |
d5e4cbfe RW |
111 | static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev) |
112 | { | |
0140d8bd RW |
113 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, stop, dev, |
114 | stop_latency_ns, "stop"); | |
d5e4cbfe RW |
115 | } |
116 | ||
ba2bbfbf UH |
117 | static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev, |
118 | bool timed) | |
d5e4cbfe | 119 | { |
ba2bbfbf UH |
120 | if (!timed) |
121 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); | |
122 | ||
0140d8bd RW |
123 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, start, dev, |
124 | start_latency_ns, "start"); | |
d5e4cbfe RW |
125 | } |
126 | ||
c4bb3160 | 127 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
f721889f | 128 | { |
c4bb3160 RW |
129 | bool ret = false; |
130 | ||
131 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) | |
132 | ret = !!atomic_dec_and_test(&genpd->sd_count); | |
133 | ||
134 | return ret; | |
135 | } | |
136 | ||
137 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) | |
138 | { | |
139 | atomic_inc(&genpd->sd_count); | |
4e857c58 | 140 | smp_mb__after_atomic(); |
f721889f RW |
141 | } |
142 | ||
cbc9ef02 RW |
143 | static void genpd_recalc_cpu_exit_latency(struct generic_pm_domain *genpd) |
144 | { | |
145 | s64 usecs64; | |
146 | ||
f39cb179 | 147 | if (!genpd->cpuidle_data) |
cbc9ef02 RW |
148 | return; |
149 | ||
150 | usecs64 = genpd->power_on_latency_ns; | |
151 | do_div(usecs64, NSEC_PER_USEC); | |
f39cb179 UH |
152 | usecs64 += genpd->cpuidle_data->saved_exit_latency; |
153 | genpd->cpuidle_data->idle_state->exit_latency = usecs64; | |
cbc9ef02 RW |
154 | } |
155 | ||
a4630c61 | 156 | static int genpd_power_on(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 GU |
157 | { |
158 | ktime_t time_start; | |
159 | s64 elapsed_ns; | |
160 | int ret; | |
161 | ||
162 | if (!genpd->power_on) | |
163 | return 0; | |
164 | ||
a4630c61 GU |
165 | if (!timed) |
166 | return genpd->power_on(genpd); | |
167 | ||
c8f0ea45 GU |
168 | time_start = ktime_get(); |
169 | ret = genpd->power_on(genpd); | |
170 | if (ret) | |
171 | return ret; | |
172 | ||
173 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
174 | if (elapsed_ns <= genpd->power_on_latency_ns) | |
175 | return ret; | |
176 | ||
177 | genpd->power_on_latency_ns = elapsed_ns; | |
178 | genpd->max_off_time_changed = true; | |
179 | genpd_recalc_cpu_exit_latency(genpd); | |
6d7d5c32 RK |
180 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
181 | genpd->name, "on", elapsed_ns); | |
c8f0ea45 GU |
182 | |
183 | return ret; | |
184 | } | |
185 | ||
a4630c61 | 186 | static int genpd_power_off(struct generic_pm_domain *genpd, bool timed) |
c8f0ea45 GU |
187 | { |
188 | ktime_t time_start; | |
189 | s64 elapsed_ns; | |
190 | int ret; | |
191 | ||
192 | if (!genpd->power_off) | |
193 | return 0; | |
194 | ||
a4630c61 GU |
195 | if (!timed) |
196 | return genpd->power_off(genpd); | |
197 | ||
c8f0ea45 GU |
198 | time_start = ktime_get(); |
199 | ret = genpd->power_off(genpd); | |
200 | if (ret == -EBUSY) | |
201 | return ret; | |
202 | ||
203 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); | |
204 | if (elapsed_ns <= genpd->power_off_latency_ns) | |
205 | return ret; | |
206 | ||
207 | genpd->power_off_latency_ns = elapsed_ns; | |
208 | genpd->max_off_time_changed = true; | |
6d7d5c32 RK |
209 | pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", |
210 | genpd->name, "off", elapsed_ns); | |
c8f0ea45 GU |
211 | |
212 | return ret; | |
213 | } | |
214 | ||
29e47e21 UH |
215 | /** |
216 | * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). | |
217 | * @genpd: PM domait to power off. | |
218 | * | |
219 | * Queue up the execution of pm_genpd_poweroff() unless it's already been done | |
220 | * before. | |
221 | */ | |
222 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) | |
223 | { | |
224 | queue_work(pm_wq, &genpd->power_off_work); | |
225 | } | |
226 | ||
5248051b | 227 | /** |
5063ce15 | 228 | * __pm_genpd_poweron - Restore power to a given PM domain and its masters. |
5248051b RW |
229 | * @genpd: PM domain to power up. |
230 | * | |
5063ce15 | 231 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
232 | * resume a device belonging to it. |
233 | */ | |
8951ef02 | 234 | static int __pm_genpd_poweron(struct generic_pm_domain *genpd) |
5248051b | 235 | { |
5063ce15 | 236 | struct gpd_link *link; |
5248051b RW |
237 | int ret = 0; |
238 | ||
17b75eca | 239 | if (genpd->status == GPD_STATE_ACTIVE |
596ba34b | 240 | || (genpd->prepared_count > 0 && genpd->suspend_power_off)) |
3f241775 | 241 | return 0; |
5248051b | 242 | |
f39cb179 | 243 | if (genpd->cpuidle_data) { |
cbc9ef02 | 244 | cpuidle_pause_and_lock(); |
f39cb179 | 245 | genpd->cpuidle_data->idle_state->disabled = true; |
cbc9ef02 RW |
246 | cpuidle_resume_and_unlock(); |
247 | goto out; | |
248 | } | |
249 | ||
5063ce15 RW |
250 | /* |
251 | * The list is guaranteed not to change while the loop below is being | |
252 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
253 | * with it. | |
254 | */ | |
255 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
256 | genpd_sd_counter_inc(link->master); | |
5248051b | 257 | |
5063ce15 | 258 | ret = pm_genpd_poweron(link->master); |
5063ce15 RW |
259 | if (ret) { |
260 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 261 | goto err; |
5063ce15 | 262 | } |
5248051b RW |
263 | } |
264 | ||
a4630c61 | 265 | ret = genpd_power_on(genpd, true); |
c8f0ea45 GU |
266 | if (ret) |
267 | goto err; | |
5248051b | 268 | |
cbc9ef02 | 269 | out: |
ba2bbfbf | 270 | genpd->status = GPD_STATE_ACTIVE; |
3f241775 | 271 | return 0; |
9e08cf42 RW |
272 | |
273 | err: | |
29e47e21 UH |
274 | list_for_each_entry_continue_reverse(link, |
275 | &genpd->slave_links, | |
276 | slave_node) { | |
5063ce15 | 277 | genpd_sd_counter_dec(link->master); |
29e47e21 UH |
278 | genpd_queue_power_off_work(link->master); |
279 | } | |
9e08cf42 | 280 | |
3f241775 RW |
281 | return ret; |
282 | } | |
283 | ||
284 | /** | |
5063ce15 | 285 | * pm_genpd_poweron - Restore power to a given PM domain and its masters. |
3f241775 RW |
286 | * @genpd: PM domain to power up. |
287 | */ | |
288 | int pm_genpd_poweron(struct generic_pm_domain *genpd) | |
289 | { | |
290 | int ret; | |
291 | ||
292 | mutex_lock(&genpd->lock); | |
293 | ret = __pm_genpd_poweron(genpd); | |
294 | mutex_unlock(&genpd->lock); | |
295 | return ret; | |
5248051b RW |
296 | } |
297 | ||
8bc0251d RW |
298 | /** |
299 | * pm_genpd_name_poweron - Restore power to a given PM domain and its masters. | |
300 | * @domain_name: Name of the PM domain to power up. | |
301 | */ | |
302 | int pm_genpd_name_poweron(const char *domain_name) | |
303 | { | |
304 | struct generic_pm_domain *genpd; | |
305 | ||
306 | genpd = pm_genpd_lookup_name(domain_name); | |
307 | return genpd ? pm_genpd_poweron(genpd) : -EINVAL; | |
308 | } | |
309 | ||
8e9afafd RW |
310 | static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev) |
311 | { | |
312 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev, | |
313 | save_state_latency_ns, "state save"); | |
314 | } | |
315 | ||
ba2bbfbf UH |
316 | static int genpd_restore_dev(struct generic_pm_domain *genpd, |
317 | struct device *dev, bool timed) | |
8e9afafd | 318 | { |
ba2bbfbf UH |
319 | if (!timed) |
320 | return GENPD_DEV_CALLBACK(genpd, int, restore_state, dev); | |
321 | ||
8e9afafd RW |
322 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev, |
323 | restore_state_latency_ns, | |
324 | "state restore"); | |
325 | } | |
326 | ||
6ff7bb0d RW |
327 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
328 | unsigned long val, void *ptr) | |
329 | { | |
330 | struct generic_pm_domain_data *gpd_data; | |
331 | struct device *dev; | |
332 | ||
333 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
6ff7bb0d | 334 | dev = gpd_data->base.dev; |
6ff7bb0d RW |
335 | |
336 | for (;;) { | |
337 | struct generic_pm_domain *genpd; | |
338 | struct pm_domain_data *pdd; | |
339 | ||
340 | spin_lock_irq(&dev->power.lock); | |
341 | ||
342 | pdd = dev->power.subsys_data ? | |
343 | dev->power.subsys_data->domain_data : NULL; | |
1d5fcfec | 344 | if (pdd && pdd->dev) { |
6ff7bb0d RW |
345 | to_gpd_data(pdd)->td.constraint_changed = true; |
346 | genpd = dev_to_genpd(dev); | |
347 | } else { | |
348 | genpd = ERR_PTR(-ENODATA); | |
349 | } | |
350 | ||
351 | spin_unlock_irq(&dev->power.lock); | |
352 | ||
353 | if (!IS_ERR(genpd)) { | |
354 | mutex_lock(&genpd->lock); | |
355 | genpd->max_off_time_changed = true; | |
356 | mutex_unlock(&genpd->lock); | |
357 | } | |
358 | ||
359 | dev = dev->parent; | |
360 | if (!dev || dev->power.ignore_children) | |
361 | break; | |
362 | } | |
363 | ||
364 | return NOTIFY_DONE; | |
365 | } | |
366 | ||
f721889f RW |
367 | /** |
368 | * pm_genpd_poweroff - Remove power from a given PM domain. | |
369 | * @genpd: PM domain to power down. | |
370 | * | |
371 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
ba2bbfbf | 372 | * have been powered down, remove power from @genpd. |
f721889f RW |
373 | */ |
374 | static int pm_genpd_poweroff(struct generic_pm_domain *genpd) | |
375 | { | |
4605ab65 | 376 | struct pm_domain_data *pdd; |
5063ce15 | 377 | struct gpd_link *link; |
ba2bbfbf | 378 | unsigned int not_suspended = 0; |
f721889f | 379 | |
c6d22b37 RW |
380 | /* |
381 | * Do not try to power off the domain in the following situations: | |
382 | * (1) The domain is already in the "power off" state. | |
ba2bbfbf | 383 | * (2) System suspend is in progress. |
c6d22b37 | 384 | */ |
3f241775 | 385 | if (genpd->status == GPD_STATE_POWER_OFF |
ba2bbfbf | 386 | || genpd->prepared_count > 0) |
f721889f RW |
387 | return 0; |
388 | ||
c4bb3160 | 389 | if (atomic_read(&genpd->sd_count) > 0) |
f721889f RW |
390 | return -EBUSY; |
391 | ||
34b1f762 RW |
392 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
393 | enum pm_qos_flags_status stat; | |
394 | ||
395 | stat = dev_pm_qos_flags(pdd->dev, | |
396 | PM_QOS_FLAG_NO_POWER_OFF | |
397 | | PM_QOS_FLAG_REMOTE_WAKEUP); | |
398 | if (stat > PM_QOS_FLAGS_NONE) | |
399 | return -EBUSY; | |
400 | ||
0aa2a221 | 401 | if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev) |
feb70af0 | 402 | || pdd->dev->power.irq_safe)) |
f721889f | 403 | not_suspended++; |
34b1f762 | 404 | } |
f721889f RW |
405 | |
406 | if (not_suspended > genpd->in_progress) | |
407 | return -EBUSY; | |
408 | ||
409 | if (genpd->gov && genpd->gov->power_down_ok) { | |
410 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
411 | return -EAGAIN; | |
412 | } | |
413 | ||
f39cb179 | 414 | if (genpd->cpuidle_data) { |
cbc9ef02 | 415 | /* |
f39cb179 UH |
416 | * If cpuidle_data is set, cpuidle should turn the domain off |
417 | * when the CPU in it is idle. In that case we don't decrement | |
418 | * the subdomain counts of the master domains, so that power is | |
419 | * not removed from the current domain prematurely as a result | |
420 | * of cutting off the masters' power. | |
cbc9ef02 RW |
421 | */ |
422 | genpd->status = GPD_STATE_POWER_OFF; | |
423 | cpuidle_pause_and_lock(); | |
f39cb179 | 424 | genpd->cpuidle_data->idle_state->disabled = false; |
cbc9ef02 | 425 | cpuidle_resume_and_unlock(); |
ba2bbfbf | 426 | return 0; |
cbc9ef02 RW |
427 | } |
428 | ||
3c07cbc4 | 429 | if (genpd->power_off) { |
ba2bbfbf UH |
430 | int ret; |
431 | ||
432 | if (atomic_read(&genpd->sd_count) > 0) | |
433 | return -EBUSY; | |
17b75eca | 434 | |
3c07cbc4 | 435 | /* |
5063ce15 RW |
436 | * If sd_count > 0 at this point, one of the subdomains hasn't |
437 | * managed to call pm_genpd_poweron() for the master yet after | |
3c07cbc4 RW |
438 | * incrementing it. In that case pm_genpd_poweron() will wait |
439 | * for us to drop the lock, so we can call .power_off() and let | |
440 | * the pm_genpd_poweron() restore power for us (this shouldn't | |
441 | * happen very often). | |
442 | */ | |
a4630c61 | 443 | ret = genpd_power_off(genpd, true); |
ba2bbfbf UH |
444 | if (ret) |
445 | return ret; | |
d2805402 | 446 | } |
f721889f | 447 | |
17b75eca | 448 | genpd->status = GPD_STATE_POWER_OFF; |
221e9b58 | 449 | |
5063ce15 RW |
450 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
451 | genpd_sd_counter_dec(link->master); | |
452 | genpd_queue_power_off_work(link->master); | |
453 | } | |
f721889f | 454 | |
ba2bbfbf | 455 | return 0; |
f721889f RW |
456 | } |
457 | ||
458 | /** | |
459 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
460 | * @work: Work structure used for scheduling the execution of this function. | |
461 | */ | |
462 | static void genpd_power_off_work_fn(struct work_struct *work) | |
463 | { | |
464 | struct generic_pm_domain *genpd; | |
465 | ||
466 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
467 | ||
ba2bbfbf | 468 | mutex_lock(&genpd->lock); |
f721889f | 469 | pm_genpd_poweroff(genpd); |
ba2bbfbf | 470 | mutex_unlock(&genpd->lock); |
f721889f RW |
471 | } |
472 | ||
473 | /** | |
474 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. | |
475 | * @dev: Device to suspend. | |
476 | * | |
477 | * Carry out a runtime suspend of a device under the assumption that its | |
478 | * pm_domain field points to the domain member of an object of type | |
479 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
480 | */ | |
481 | static int pm_genpd_runtime_suspend(struct device *dev) | |
482 | { | |
483 | struct generic_pm_domain *genpd; | |
b02c999a | 484 | bool (*stop_ok)(struct device *__dev); |
d5e4cbfe | 485 | int ret; |
f721889f RW |
486 | |
487 | dev_dbg(dev, "%s()\n", __func__); | |
488 | ||
5248051b RW |
489 | genpd = dev_to_genpd(dev); |
490 | if (IS_ERR(genpd)) | |
f721889f RW |
491 | return -EINVAL; |
492 | ||
b02c999a RW |
493 | stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL; |
494 | if (stop_ok && !stop_ok(dev)) | |
495 | return -EBUSY; | |
496 | ||
ba2bbfbf | 497 | ret = genpd_save_dev(genpd, dev); |
d5e4cbfe RW |
498 | if (ret) |
499 | return ret; | |
17b75eca | 500 | |
ba2bbfbf UH |
501 | ret = genpd_stop_dev(genpd, dev); |
502 | if (ret) { | |
503 | genpd_restore_dev(genpd, dev, true); | |
504 | return ret; | |
505 | } | |
506 | ||
0aa2a221 RW |
507 | /* |
508 | * If power.irq_safe is set, this routine will be run with interrupts | |
509 | * off, so it can't use mutexes. | |
510 | */ | |
511 | if (dev->power.irq_safe) | |
512 | return 0; | |
513 | ||
c6d22b37 | 514 | mutex_lock(&genpd->lock); |
f721889f RW |
515 | genpd->in_progress++; |
516 | pm_genpd_poweroff(genpd); | |
517 | genpd->in_progress--; | |
c6d22b37 | 518 | mutex_unlock(&genpd->lock); |
f721889f RW |
519 | |
520 | return 0; | |
521 | } | |
522 | ||
f721889f RW |
523 | /** |
524 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
525 | * @dev: Device to resume. | |
526 | * | |
527 | * Carry out a runtime resume of a device under the assumption that its | |
528 | * pm_domain field points to the domain member of an object of type | |
529 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
530 | */ | |
531 | static int pm_genpd_runtime_resume(struct device *dev) | |
532 | { | |
533 | struct generic_pm_domain *genpd; | |
f721889f | 534 | int ret; |
ba2bbfbf | 535 | bool timed = true; |
f721889f RW |
536 | |
537 | dev_dbg(dev, "%s()\n", __func__); | |
538 | ||
5248051b RW |
539 | genpd = dev_to_genpd(dev); |
540 | if (IS_ERR(genpd)) | |
f721889f RW |
541 | return -EINVAL; |
542 | ||
0aa2a221 | 543 | /* If power.irq_safe, the PM domain is never powered off. */ |
ba2bbfbf UH |
544 | if (dev->power.irq_safe) { |
545 | timed = false; | |
546 | goto out; | |
547 | } | |
0aa2a221 | 548 | |
c6d22b37 | 549 | mutex_lock(&genpd->lock); |
3f241775 | 550 | ret = __pm_genpd_poweron(genpd); |
ba2bbfbf | 551 | mutex_unlock(&genpd->lock); |
c6d22b37 | 552 | |
ba2bbfbf UH |
553 | if (ret) |
554 | return ret; | |
c6d22b37 | 555 | |
ba2bbfbf UH |
556 | out: |
557 | genpd_start_dev(genpd, dev, timed); | |
558 | genpd_restore_dev(genpd, dev, timed); | |
17b75eca | 559 | |
f721889f RW |
560 | return 0; |
561 | } | |
562 | ||
39ac5ba5 TB |
563 | static bool pd_ignore_unused; |
564 | static int __init pd_ignore_unused_setup(char *__unused) | |
565 | { | |
566 | pd_ignore_unused = true; | |
567 | return 1; | |
568 | } | |
569 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
570 | ||
17f2ae7f RW |
571 | /** |
572 | * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. | |
573 | */ | |
574 | void pm_genpd_poweroff_unused(void) | |
575 | { | |
576 | struct generic_pm_domain *genpd; | |
577 | ||
39ac5ba5 TB |
578 | if (pd_ignore_unused) { |
579 | pr_warn("genpd: Not disabling unused power domains\n"); | |
580 | return; | |
581 | } | |
582 | ||
17f2ae7f RW |
583 | mutex_lock(&gpd_list_lock); |
584 | ||
585 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
586 | genpd_queue_power_off_work(genpd); | |
587 | ||
588 | mutex_unlock(&gpd_list_lock); | |
589 | } | |
590 | ||
2fe71dcd UH |
591 | static int __init genpd_poweroff_unused(void) |
592 | { | |
593 | pm_genpd_poweroff_unused(); | |
594 | return 0; | |
595 | } | |
596 | late_initcall(genpd_poweroff_unused); | |
597 | ||
596ba34b RW |
598 | #ifdef CONFIG_PM_SLEEP |
599 | ||
77f827de RW |
600 | /** |
601 | * pm_genpd_present - Check if the given PM domain has been initialized. | |
602 | * @genpd: PM domain to check. | |
603 | */ | |
895b31f3 | 604 | static bool pm_genpd_present(const struct generic_pm_domain *genpd) |
77f827de | 605 | { |
895b31f3 | 606 | const struct generic_pm_domain *gpd; |
77f827de RW |
607 | |
608 | if (IS_ERR_OR_NULL(genpd)) | |
609 | return false; | |
610 | ||
611 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
612 | if (gpd == genpd) | |
613 | return true; | |
614 | ||
615 | return false; | |
616 | } | |
617 | ||
d5e4cbfe RW |
618 | static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, |
619 | struct device *dev) | |
620 | { | |
621 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); | |
622 | } | |
623 | ||
596ba34b | 624 | /** |
5063ce15 | 625 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters. |
596ba34b | 626 | * @genpd: PM domain to power off, if possible. |
a4630c61 | 627 | * @timed: True if latency measurements are allowed. |
596ba34b RW |
628 | * |
629 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 630 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b | 631 | * |
77f827de RW |
632 | * This function is only called in "noirq" and "syscore" stages of system power |
633 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
634 | * executed sequentially, so it is guaranteed that it will never run twice in | |
635 | * parallel). | |
596ba34b | 636 | */ |
a4630c61 GU |
637 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd, |
638 | bool timed) | |
596ba34b | 639 | { |
5063ce15 | 640 | struct gpd_link *link; |
596ba34b | 641 | |
17b75eca | 642 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
643 | return; |
644 | ||
c4bb3160 RW |
645 | if (genpd->suspended_count != genpd->device_count |
646 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
647 | return; |
648 | ||
a4630c61 | 649 | genpd_power_off(genpd, timed); |
596ba34b | 650 | |
17b75eca | 651 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
652 | |
653 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
654 | genpd_sd_counter_dec(link->master); | |
a4630c61 | 655 | pm_genpd_sync_poweroff(link->master, timed); |
596ba34b RW |
656 | } |
657 | } | |
658 | ||
802d8b49 RW |
659 | /** |
660 | * pm_genpd_sync_poweron - Synchronously power on a PM domain and its masters. | |
661 | * @genpd: PM domain to power on. | |
a4630c61 | 662 | * @timed: True if latency measurements are allowed. |
802d8b49 | 663 | * |
77f827de RW |
664 | * This function is only called in "noirq" and "syscore" stages of system power |
665 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
666 | * executed sequentially, so it is guaranteed that it will never run twice in | |
667 | * parallel). | |
802d8b49 | 668 | */ |
a4630c61 GU |
669 | static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd, |
670 | bool timed) | |
802d8b49 RW |
671 | { |
672 | struct gpd_link *link; | |
673 | ||
ba2bbfbf | 674 | if (genpd->status == GPD_STATE_ACTIVE) |
802d8b49 RW |
675 | return; |
676 | ||
677 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
a4630c61 | 678 | pm_genpd_sync_poweron(link->master, timed); |
802d8b49 RW |
679 | genpd_sd_counter_inc(link->master); |
680 | } | |
681 | ||
a4630c61 | 682 | genpd_power_on(genpd, timed); |
802d8b49 RW |
683 | |
684 | genpd->status = GPD_STATE_ACTIVE; | |
685 | } | |
686 | ||
4ecd6e65 RW |
687 | /** |
688 | * resume_needed - Check whether to resume a device before system suspend. | |
689 | * @dev: Device to check. | |
690 | * @genpd: PM domain the device belongs to. | |
691 | * | |
692 | * There are two cases in which a device that can wake up the system from sleep | |
693 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
694 | * to wake up the system and it has to remain active for this purpose while the | |
695 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
696 | * the system from sleep states and it generally doesn't generate wakeup signals | |
697 | * by itself (those signals are generated on its behalf by other parts of the | |
698 | * system). In the latter case it may be necessary to reconfigure the device's | |
699 | * wakeup settings during system suspend, because it may have been set up to | |
700 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
701 | * Return 'true' in either of the above cases. | |
702 | */ | |
703 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
704 | { | |
705 | bool active_wakeup; | |
706 | ||
707 | if (!device_can_wakeup(dev)) | |
708 | return false; | |
709 | ||
d5e4cbfe | 710 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
4ecd6e65 RW |
711 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
712 | } | |
713 | ||
596ba34b RW |
714 | /** |
715 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
716 | * @dev: Device to start the transition of. | |
717 | * | |
718 | * Start a power transition of a device (during a system-wide power transition) | |
719 | * under the assumption that its pm_domain field points to the domain member of | |
720 | * an object of type struct generic_pm_domain representing a PM domain | |
721 | * consisting of I/O devices. | |
722 | */ | |
723 | static int pm_genpd_prepare(struct device *dev) | |
724 | { | |
725 | struct generic_pm_domain *genpd; | |
b6c10c84 | 726 | int ret; |
596ba34b RW |
727 | |
728 | dev_dbg(dev, "%s()\n", __func__); | |
729 | ||
730 | genpd = dev_to_genpd(dev); | |
731 | if (IS_ERR(genpd)) | |
732 | return -EINVAL; | |
733 | ||
17b75eca RW |
734 | /* |
735 | * If a wakeup request is pending for the device, it should be woken up | |
736 | * at this point and a system wakeup event should be reported if it's | |
737 | * set up to wake up the system from sleep states. | |
738 | */ | |
739 | pm_runtime_get_noresume(dev); | |
740 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
741 | pm_wakeup_event(dev, 0); | |
742 | ||
743 | if (pm_wakeup_pending()) { | |
84167035 | 744 | pm_runtime_put(dev); |
17b75eca RW |
745 | return -EBUSY; |
746 | } | |
747 | ||
4ecd6e65 RW |
748 | if (resume_needed(dev, genpd)) |
749 | pm_runtime_resume(dev); | |
750 | ||
ba2bbfbf | 751 | mutex_lock(&genpd->lock); |
596ba34b | 752 | |
65533bbf RW |
753 | if (genpd->prepared_count++ == 0) { |
754 | genpd->suspended_count = 0; | |
17b75eca | 755 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
65533bbf | 756 | } |
17b75eca | 757 | |
ba2bbfbf | 758 | mutex_unlock(&genpd->lock); |
596ba34b RW |
759 | |
760 | if (genpd->suspend_power_off) { | |
17b75eca | 761 | pm_runtime_put_noidle(dev); |
596ba34b RW |
762 | return 0; |
763 | } | |
764 | ||
765 | /* | |
17b75eca RW |
766 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
767 | * so pm_genpd_poweron() will return immediately, but if the device | |
d5e4cbfe | 768 | * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need |
17b75eca | 769 | * to make it operational. |
596ba34b | 770 | */ |
17b75eca | 771 | pm_runtime_resume(dev); |
596ba34b RW |
772 | __pm_runtime_disable(dev, false); |
773 | ||
b6c10c84 RW |
774 | ret = pm_generic_prepare(dev); |
775 | if (ret) { | |
776 | mutex_lock(&genpd->lock); | |
777 | ||
778 | if (--genpd->prepared_count == 0) | |
779 | genpd->suspend_power_off = false; | |
780 | ||
781 | mutex_unlock(&genpd->lock); | |
17b75eca | 782 | pm_runtime_enable(dev); |
b6c10c84 | 783 | } |
17b75eca | 784 | |
84167035 | 785 | pm_runtime_put(dev); |
b6c10c84 | 786 | return ret; |
596ba34b RW |
787 | } |
788 | ||
789 | /** | |
790 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. | |
791 | * @dev: Device to suspend. | |
792 | * | |
793 | * Suspend a device under the assumption that its pm_domain field points to the | |
794 | * domain member of an object of type struct generic_pm_domain representing | |
795 | * a PM domain consisting of I/O devices. | |
796 | */ | |
797 | static int pm_genpd_suspend(struct device *dev) | |
798 | { | |
799 | struct generic_pm_domain *genpd; | |
800 | ||
801 | dev_dbg(dev, "%s()\n", __func__); | |
802 | ||
803 | genpd = dev_to_genpd(dev); | |
804 | if (IS_ERR(genpd)) | |
805 | return -EINVAL; | |
806 | ||
1e0407ca | 807 | return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev); |
596ba34b RW |
808 | } |
809 | ||
810 | /** | |
0496c8ae | 811 | * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain. |
596ba34b RW |
812 | * @dev: Device to suspend. |
813 | * | |
814 | * Carry out a late suspend of a device under the assumption that its | |
815 | * pm_domain field points to the domain member of an object of type | |
816 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
817 | */ | |
0496c8ae | 818 | static int pm_genpd_suspend_late(struct device *dev) |
596ba34b RW |
819 | { |
820 | struct generic_pm_domain *genpd; | |
596ba34b RW |
821 | |
822 | dev_dbg(dev, "%s()\n", __func__); | |
823 | ||
824 | genpd = dev_to_genpd(dev); | |
825 | if (IS_ERR(genpd)) | |
826 | return -EINVAL; | |
827 | ||
1e0407ca | 828 | return genpd->suspend_power_off ? 0 : pm_generic_suspend_late(dev); |
0496c8ae | 829 | } |
596ba34b | 830 | |
0496c8ae RW |
831 | /** |
832 | * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. | |
833 | * @dev: Device to suspend. | |
834 | * | |
835 | * Stop the device and remove power from the domain if all devices in it have | |
836 | * been stopped. | |
837 | */ | |
838 | static int pm_genpd_suspend_noirq(struct device *dev) | |
839 | { | |
840 | struct generic_pm_domain *genpd; | |
841 | ||
842 | dev_dbg(dev, "%s()\n", __func__); | |
843 | ||
844 | genpd = dev_to_genpd(dev); | |
845 | if (IS_ERR(genpd)) | |
846 | return -EINVAL; | |
596ba34b | 847 | |
dbf37414 | 848 | if (genpd->suspend_power_off |
0496c8ae | 849 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
d4f2d87a RW |
850 | return 0; |
851 | ||
d5e4cbfe | 852 | genpd_stop_dev(genpd, dev); |
596ba34b RW |
853 | |
854 | /* | |
855 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
856 | * guaranteed that this function will never run twice in parallel for | |
857 | * the same PM domain, so it is not necessary to use locking here. | |
858 | */ | |
859 | genpd->suspended_count++; | |
a4630c61 | 860 | pm_genpd_sync_poweroff(genpd, true); |
596ba34b RW |
861 | |
862 | return 0; | |
863 | } | |
864 | ||
865 | /** | |
0496c8ae | 866 | * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
867 | * @dev: Device to resume. |
868 | * | |
0496c8ae | 869 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b RW |
870 | */ |
871 | static int pm_genpd_resume_noirq(struct device *dev) | |
872 | { | |
873 | struct generic_pm_domain *genpd; | |
874 | ||
875 | dev_dbg(dev, "%s()\n", __func__); | |
876 | ||
877 | genpd = dev_to_genpd(dev); | |
878 | if (IS_ERR(genpd)) | |
879 | return -EINVAL; | |
880 | ||
dbf37414 | 881 | if (genpd->suspend_power_off |
cc85b207 | 882 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
596ba34b RW |
883 | return 0; |
884 | ||
885 | /* | |
886 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
887 | * guaranteed that this function will never run twice in parallel for | |
888 | * the same PM domain, so it is not necessary to use locking here. | |
889 | */ | |
a4630c61 | 890 | pm_genpd_sync_poweron(genpd, true); |
596ba34b | 891 | genpd->suspended_count--; |
596ba34b | 892 | |
ba2bbfbf | 893 | return genpd_start_dev(genpd, dev, true); |
596ba34b RW |
894 | } |
895 | ||
896 | /** | |
0496c8ae RW |
897 | * pm_genpd_resume_early - Early resume of a device in an I/O PM domain. |
898 | * @dev: Device to resume. | |
899 | * | |
900 | * Carry out an early resume 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_resume_early(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_resume_early(dev); |
0496c8ae RW |
916 | } |
917 | ||
918 | /** | |
919 | * pm_genpd_resume - Resume of device in an I/O PM domain. | |
596ba34b RW |
920 | * @dev: Device to resume. |
921 | * | |
922 | * Resume a device under the assumption that its pm_domain field points to the | |
923 | * domain member of an object of type struct generic_pm_domain representing | |
924 | * a power domain consisting of I/O devices. | |
925 | */ | |
926 | static int pm_genpd_resume(struct device *dev) | |
927 | { | |
928 | struct generic_pm_domain *genpd; | |
929 | ||
930 | dev_dbg(dev, "%s()\n", __func__); | |
931 | ||
932 | genpd = dev_to_genpd(dev); | |
933 | if (IS_ERR(genpd)) | |
934 | return -EINVAL; | |
935 | ||
1e0407ca | 936 | return genpd->suspend_power_off ? 0 : pm_generic_resume(dev); |
596ba34b RW |
937 | } |
938 | ||
939 | /** | |
0496c8ae | 940 | * pm_genpd_freeze - Freezing a device in an I/O PM domain. |
596ba34b RW |
941 | * @dev: Device to freeze. |
942 | * | |
943 | * Freeze a device under the assumption that its pm_domain field points to the | |
944 | * domain member of an object of type struct generic_pm_domain representing | |
945 | * a power domain consisting of I/O devices. | |
946 | */ | |
947 | static int pm_genpd_freeze(struct device *dev) | |
948 | { | |
949 | struct generic_pm_domain *genpd; | |
950 | ||
951 | dev_dbg(dev, "%s()\n", __func__); | |
952 | ||
953 | genpd = dev_to_genpd(dev); | |
954 | if (IS_ERR(genpd)) | |
955 | return -EINVAL; | |
956 | ||
1e0407ca | 957 | return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev); |
596ba34b RW |
958 | } |
959 | ||
960 | /** | |
0496c8ae RW |
961 | * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain. |
962 | * @dev: Device to freeze. | |
963 | * | |
964 | * Carry out a late freeze of a device under the assumption that its | |
965 | * pm_domain field points to the domain member of an object of type | |
966 | * struct generic_pm_domain representing a power domain consisting of I/O | |
967 | * devices. | |
968 | */ | |
969 | static int pm_genpd_freeze_late(struct device *dev) | |
970 | { | |
971 | struct generic_pm_domain *genpd; | |
972 | ||
973 | dev_dbg(dev, "%s()\n", __func__); | |
974 | ||
975 | genpd = dev_to_genpd(dev); | |
976 | if (IS_ERR(genpd)) | |
977 | return -EINVAL; | |
978 | ||
1e0407ca | 979 | return genpd->suspend_power_off ? 0 : pm_generic_freeze_late(dev); |
0496c8ae RW |
980 | } |
981 | ||
982 | /** | |
983 | * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. | |
596ba34b RW |
984 | * @dev: Device to freeze. |
985 | * | |
986 | * Carry out a late freeze of a device under the assumption that its | |
987 | * pm_domain field points to the domain member of an object of type | |
988 | * struct generic_pm_domain representing a power domain consisting of I/O | |
989 | * devices. | |
990 | */ | |
991 | static int pm_genpd_freeze_noirq(struct device *dev) | |
992 | { | |
993 | struct generic_pm_domain *genpd; | |
596ba34b RW |
994 | |
995 | dev_dbg(dev, "%s()\n", __func__); | |
996 | ||
997 | genpd = dev_to_genpd(dev); | |
998 | if (IS_ERR(genpd)) | |
999 | return -EINVAL; | |
1000 | ||
dbf37414 | 1001 | return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev); |
0496c8ae | 1002 | } |
596ba34b | 1003 | |
0496c8ae RW |
1004 | /** |
1005 | * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. | |
1006 | * @dev: Device to thaw. | |
1007 | * | |
1008 | * Start the device, unless power has been removed from the domain already | |
1009 | * before the system transition. | |
1010 | */ | |
1011 | static int pm_genpd_thaw_noirq(struct device *dev) | |
1012 | { | |
1013 | struct generic_pm_domain *genpd; | |
596ba34b | 1014 | |
0496c8ae | 1015 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1016 | |
0496c8ae RW |
1017 | genpd = dev_to_genpd(dev); |
1018 | if (IS_ERR(genpd)) | |
1019 | return -EINVAL; | |
1020 | ||
ba2bbfbf | 1021 | return genpd->suspend_power_off ? 0 : genpd_start_dev(genpd, dev, true); |
596ba34b RW |
1022 | } |
1023 | ||
1024 | /** | |
0496c8ae | 1025 | * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain. |
596ba34b RW |
1026 | * @dev: Device to thaw. |
1027 | * | |
1028 | * Carry out an early thaw of a device under the assumption that its | |
1029 | * pm_domain field points to the domain member of an object of type | |
1030 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1031 | * devices. | |
1032 | */ | |
0496c8ae | 1033 | static int pm_genpd_thaw_early(struct device *dev) |
596ba34b RW |
1034 | { |
1035 | struct generic_pm_domain *genpd; | |
1036 | ||
1037 | dev_dbg(dev, "%s()\n", __func__); | |
1038 | ||
1039 | genpd = dev_to_genpd(dev); | |
1040 | if (IS_ERR(genpd)) | |
1041 | return -EINVAL; | |
1042 | ||
1e0407ca | 1043 | return genpd->suspend_power_off ? 0 : pm_generic_thaw_early(dev); |
596ba34b RW |
1044 | } |
1045 | ||
1046 | /** | |
1047 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. | |
1048 | * @dev: Device to thaw. | |
1049 | * | |
1050 | * Thaw a device under the assumption that its pm_domain field points to the | |
1051 | * domain member of an object of type struct generic_pm_domain representing | |
1052 | * a power domain consisting of I/O devices. | |
1053 | */ | |
1054 | static int pm_genpd_thaw(struct device *dev) | |
1055 | { | |
1056 | struct generic_pm_domain *genpd; | |
1057 | ||
1058 | dev_dbg(dev, "%s()\n", __func__); | |
1059 | ||
1060 | genpd = dev_to_genpd(dev); | |
1061 | if (IS_ERR(genpd)) | |
1062 | return -EINVAL; | |
1063 | ||
1e0407ca | 1064 | return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev); |
596ba34b RW |
1065 | } |
1066 | ||
1067 | /** | |
0496c8ae | 1068 | * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1069 | * @dev: Device to resume. |
1070 | * | |
0496c8ae RW |
1071 | * Make sure the domain will be in the same power state as before the |
1072 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b RW |
1073 | */ |
1074 | static int pm_genpd_restore_noirq(struct device *dev) | |
1075 | { | |
1076 | struct generic_pm_domain *genpd; | |
1077 | ||
1078 | dev_dbg(dev, "%s()\n", __func__); | |
1079 | ||
1080 | genpd = dev_to_genpd(dev); | |
1081 | if (IS_ERR(genpd)) | |
1082 | return -EINVAL; | |
1083 | ||
1084 | /* | |
1085 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1086 | * guaranteed that this function will never run twice in parallel for | |
1087 | * the same PM domain, so it is not necessary to use locking here. | |
65533bbf RW |
1088 | * |
1089 | * At this point suspended_count == 0 means we are being run for the | |
1090 | * first time for the given domain in the present cycle. | |
596ba34b | 1091 | */ |
65533bbf | 1092 | if (genpd->suspended_count++ == 0) { |
596ba34b | 1093 | /* |
65533bbf | 1094 | * The boot kernel might put the domain into arbitrary state, |
802d8b49 RW |
1095 | * so make it appear as powered off to pm_genpd_sync_poweron(), |
1096 | * so that it tries to power it on in case it was really off. | |
596ba34b | 1097 | */ |
65533bbf RW |
1098 | genpd->status = GPD_STATE_POWER_OFF; |
1099 | if (genpd->suspend_power_off) { | |
1100 | /* | |
1101 | * If the domain was off before the hibernation, make | |
1102 | * sure it will be off going forward. | |
1103 | */ | |
a4630c61 | 1104 | genpd_power_off(genpd, true); |
65533bbf RW |
1105 | |
1106 | return 0; | |
1107 | } | |
596ba34b RW |
1108 | } |
1109 | ||
18dd2ece RW |
1110 | if (genpd->suspend_power_off) |
1111 | return 0; | |
1112 | ||
a4630c61 | 1113 | pm_genpd_sync_poweron(genpd, true); |
596ba34b | 1114 | |
ba2bbfbf | 1115 | return genpd_start_dev(genpd, dev, true); |
596ba34b RW |
1116 | } |
1117 | ||
1118 | /** | |
1119 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
1120 | * @dev: Device to complete the transition of. | |
1121 | * | |
1122 | * Complete a power transition of a device (during a system-wide power | |
1123 | * transition) under the assumption that its pm_domain field points to the | |
1124 | * domain member of an object of type struct generic_pm_domain representing | |
1125 | * a power domain consisting of I/O devices. | |
1126 | */ | |
1127 | static void pm_genpd_complete(struct device *dev) | |
1128 | { | |
1129 | struct generic_pm_domain *genpd; | |
1130 | bool run_complete; | |
1131 | ||
1132 | dev_dbg(dev, "%s()\n", __func__); | |
1133 | ||
1134 | genpd = dev_to_genpd(dev); | |
1135 | if (IS_ERR(genpd)) | |
1136 | return; | |
1137 | ||
1138 | mutex_lock(&genpd->lock); | |
1139 | ||
1140 | run_complete = !genpd->suspend_power_off; | |
1141 | if (--genpd->prepared_count == 0) | |
1142 | genpd->suspend_power_off = false; | |
1143 | ||
1144 | mutex_unlock(&genpd->lock); | |
1145 | ||
1146 | if (run_complete) { | |
1147 | pm_generic_complete(dev); | |
6f00ff78 | 1148 | pm_runtime_set_active(dev); |
596ba34b | 1149 | pm_runtime_enable(dev); |
af939339 | 1150 | pm_request_idle(dev); |
596ba34b RW |
1151 | } |
1152 | } | |
1153 | ||
77f827de | 1154 | /** |
d47e6464 | 1155 | * genpd_syscore_switch - Switch power during system core suspend or resume. |
77f827de RW |
1156 | * @dev: Device that normally is marked as "always on" to switch power for. |
1157 | * | |
1158 | * This routine may only be called during the system core (syscore) suspend or | |
1159 | * resume phase for devices whose "always on" flags are set. | |
1160 | */ | |
d47e6464 | 1161 | static void genpd_syscore_switch(struct device *dev, bool suspend) |
77f827de RW |
1162 | { |
1163 | struct generic_pm_domain *genpd; | |
1164 | ||
1165 | genpd = dev_to_genpd(dev); | |
1166 | if (!pm_genpd_present(genpd)) | |
1167 | return; | |
1168 | ||
1169 | if (suspend) { | |
1170 | genpd->suspended_count++; | |
a4630c61 | 1171 | pm_genpd_sync_poweroff(genpd, false); |
77f827de | 1172 | } else { |
a4630c61 | 1173 | pm_genpd_sync_poweron(genpd, false); |
77f827de RW |
1174 | genpd->suspended_count--; |
1175 | } | |
1176 | } | |
d47e6464 UH |
1177 | |
1178 | void pm_genpd_syscore_poweroff(struct device *dev) | |
1179 | { | |
1180 | genpd_syscore_switch(dev, true); | |
1181 | } | |
1182 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); | |
1183 | ||
1184 | void pm_genpd_syscore_poweron(struct device *dev) | |
1185 | { | |
1186 | genpd_syscore_switch(dev, false); | |
1187 | } | |
1188 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); | |
77f827de | 1189 | |
d30d819d | 1190 | #else /* !CONFIG_PM_SLEEP */ |
596ba34b RW |
1191 | |
1192 | #define pm_genpd_prepare NULL | |
1193 | #define pm_genpd_suspend NULL | |
0496c8ae | 1194 | #define pm_genpd_suspend_late NULL |
596ba34b | 1195 | #define pm_genpd_suspend_noirq NULL |
0496c8ae | 1196 | #define pm_genpd_resume_early NULL |
596ba34b RW |
1197 | #define pm_genpd_resume_noirq NULL |
1198 | #define pm_genpd_resume NULL | |
1199 | #define pm_genpd_freeze NULL | |
0496c8ae | 1200 | #define pm_genpd_freeze_late NULL |
596ba34b | 1201 | #define pm_genpd_freeze_noirq NULL |
0496c8ae | 1202 | #define pm_genpd_thaw_early NULL |
596ba34b RW |
1203 | #define pm_genpd_thaw_noirq NULL |
1204 | #define pm_genpd_thaw NULL | |
596ba34b | 1205 | #define pm_genpd_restore_noirq NULL |
596ba34b RW |
1206 | #define pm_genpd_complete NULL |
1207 | ||
1208 | #endif /* CONFIG_PM_SLEEP */ | |
1209 | ||
f104e1e5 UH |
1210 | static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, |
1211 | struct generic_pm_domain *genpd, | |
1212 | struct gpd_timing_data *td) | |
1d5fcfec RW |
1213 | { |
1214 | struct generic_pm_domain_data *gpd_data; | |
3e235685 UH |
1215 | int ret; |
1216 | ||
1217 | ret = dev_pm_get_subsys_data(dev); | |
1218 | if (ret) | |
1219 | return ERR_PTR(ret); | |
1d5fcfec RW |
1220 | |
1221 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
3e235685 UH |
1222 | if (!gpd_data) { |
1223 | ret = -ENOMEM; | |
1224 | goto err_put; | |
1225 | } | |
1d5fcfec | 1226 | |
f104e1e5 UH |
1227 | if (td) |
1228 | gpd_data->td = *td; | |
1229 | ||
1230 | gpd_data->base.dev = dev; | |
f104e1e5 UH |
1231 | gpd_data->td.constraint_changed = true; |
1232 | gpd_data->td.effective_constraint_ns = -1; | |
1233 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; | |
1234 | ||
1235 | spin_lock_irq(&dev->power.lock); | |
1236 | ||
1237 | if (dev->power.subsys_data->domain_data) { | |
1238 | ret = -EINVAL; | |
1239 | goto err_free; | |
1240 | } | |
1241 | ||
1242 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
1243 | dev->pm_domain = &genpd->domain; | |
1244 | ||
1245 | spin_unlock_irq(&dev->power.lock); | |
1246 | ||
1d5fcfec | 1247 | return gpd_data; |
3e235685 | 1248 | |
f104e1e5 UH |
1249 | err_free: |
1250 | spin_unlock_irq(&dev->power.lock); | |
1251 | kfree(gpd_data); | |
3e235685 UH |
1252 | err_put: |
1253 | dev_pm_put_subsys_data(dev); | |
1254 | return ERR_PTR(ret); | |
1d5fcfec RW |
1255 | } |
1256 | ||
49d400c7 UH |
1257 | static void genpd_free_dev_data(struct device *dev, |
1258 | struct generic_pm_domain_data *gpd_data) | |
1d5fcfec | 1259 | { |
f104e1e5 UH |
1260 | spin_lock_irq(&dev->power.lock); |
1261 | ||
1262 | dev->pm_domain = NULL; | |
1263 | dev->power.subsys_data->domain_data = NULL; | |
1264 | ||
1265 | spin_unlock_irq(&dev->power.lock); | |
1266 | ||
1d5fcfec | 1267 | kfree(gpd_data); |
3e235685 | 1268 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1269 | } |
1270 | ||
f721889f | 1271 | /** |
b02c999a | 1272 | * __pm_genpd_add_device - Add a device to an I/O PM domain. |
f721889f RW |
1273 | * @genpd: PM domain to add the device to. |
1274 | * @dev: Device to be added. | |
b02c999a | 1275 | * @td: Set of PM QoS timing parameters to attach to the device. |
f721889f | 1276 | */ |
b02c999a RW |
1277 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1278 | struct gpd_timing_data *td) | |
f721889f | 1279 | { |
c0356db7 | 1280 | struct generic_pm_domain_data *gpd_data; |
f721889f RW |
1281 | int ret = 0; |
1282 | ||
1283 | dev_dbg(dev, "%s()\n", __func__); | |
1284 | ||
1285 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1286 | return -EINVAL; | |
1287 | ||
f104e1e5 | 1288 | gpd_data = genpd_alloc_dev_data(dev, genpd, td); |
3e235685 UH |
1289 | if (IS_ERR(gpd_data)) |
1290 | return PTR_ERR(gpd_data); | |
6ff7bb0d | 1291 | |
ba2bbfbf | 1292 | mutex_lock(&genpd->lock); |
f721889f | 1293 | |
596ba34b RW |
1294 | if (genpd->prepared_count > 0) { |
1295 | ret = -EAGAIN; | |
1296 | goto out; | |
1297 | } | |
1298 | ||
b472c2fa UH |
1299 | ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
1300 | if (ret) | |
1301 | goto out; | |
d79b6fe1 | 1302 | |
14b53064 UH |
1303 | genpd->device_count++; |
1304 | genpd->max_off_time_changed = true; | |
1305 | ||
1d5fcfec | 1306 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
6ff7bb0d | 1307 | |
f721889f | 1308 | out: |
ba2bbfbf | 1309 | mutex_unlock(&genpd->lock); |
f721889f | 1310 | |
c0356db7 UH |
1311 | if (ret) |
1312 | genpd_free_dev_data(dev, gpd_data); | |
1313 | else | |
1314 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1d5fcfec | 1315 | |
f721889f RW |
1316 | return ret; |
1317 | } | |
1318 | ||
b5abb085 RW |
1319 | /** |
1320 | * __pm_genpd_name_add_device - Find I/O PM domain and add a device to it. | |
1321 | * @domain_name: Name of the PM domain to add the device to. | |
1322 | * @dev: Device to be added. | |
1323 | * @td: Set of PM QoS timing parameters to attach to the device. | |
1324 | */ | |
1325 | int __pm_genpd_name_add_device(const char *domain_name, struct device *dev, | |
1326 | struct gpd_timing_data *td) | |
1327 | { | |
8bc0251d | 1328 | return __pm_genpd_add_device(pm_genpd_lookup_name(domain_name), dev, td); |
b5abb085 RW |
1329 | } |
1330 | ||
f721889f RW |
1331 | /** |
1332 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1333 | * @genpd: PM domain to remove the device from. | |
1334 | * @dev: Device to be removed. | |
1335 | */ | |
1336 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1337 | struct device *dev) | |
1338 | { | |
6ff7bb0d | 1339 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1340 | struct pm_domain_data *pdd; |
efa69025 | 1341 | int ret = 0; |
f721889f RW |
1342 | |
1343 | dev_dbg(dev, "%s()\n", __func__); | |
1344 | ||
df6a0d6f | 1345 | if (!genpd || genpd != pm_genpd_lookup_dev(dev)) |
f721889f RW |
1346 | return -EINVAL; |
1347 | ||
c0356db7 UH |
1348 | /* The above validation also means we have existing domain_data. */ |
1349 | pdd = dev->power.subsys_data->domain_data; | |
1350 | gpd_data = to_gpd_data(pdd); | |
1351 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
1352 | ||
ba2bbfbf | 1353 | mutex_lock(&genpd->lock); |
f721889f | 1354 | |
596ba34b RW |
1355 | if (genpd->prepared_count > 0) { |
1356 | ret = -EAGAIN; | |
1357 | goto out; | |
1358 | } | |
1359 | ||
6ff7bb0d RW |
1360 | genpd->device_count--; |
1361 | genpd->max_off_time_changed = true; | |
1362 | ||
d79b6fe1 | 1363 | if (genpd->detach_dev) |
c16561e8 | 1364 | genpd->detach_dev(genpd, dev); |
d79b6fe1 | 1365 | |
efa69025 | 1366 | list_del_init(&pdd->list_node); |
6ff7bb0d | 1367 | |
ba2bbfbf | 1368 | mutex_unlock(&genpd->lock); |
6ff7bb0d | 1369 | |
c1dbe2fb | 1370 | genpd_free_dev_data(dev, gpd_data); |
1d5fcfec | 1371 | |
6ff7bb0d | 1372 | return 0; |
f721889f | 1373 | |
596ba34b | 1374 | out: |
ba2bbfbf | 1375 | mutex_unlock(&genpd->lock); |
c0356db7 | 1376 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); |
f721889f RW |
1377 | |
1378 | return ret; | |
1379 | } | |
1380 | ||
1381 | /** | |
1382 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1383 | * @genpd: Master PM domain to add the subdomain to. | |
bc0403ff | 1384 | * @subdomain: Subdomain to be added. |
f721889f RW |
1385 | */ |
1386 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
bc0403ff | 1387 | struct generic_pm_domain *subdomain) |
f721889f | 1388 | { |
5063ce15 | 1389 | struct gpd_link *link; |
f721889f RW |
1390 | int ret = 0; |
1391 | ||
fb7268be RW |
1392 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1393 | || genpd == subdomain) | |
f721889f RW |
1394 | return -EINVAL; |
1395 | ||
ba2bbfbf | 1396 | mutex_lock(&genpd->lock); |
bc0403ff | 1397 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); |
f721889f | 1398 | |
17b75eca | 1399 | if (genpd->status == GPD_STATE_POWER_OFF |
bc0403ff | 1400 | && subdomain->status != GPD_STATE_POWER_OFF) { |
f721889f RW |
1401 | ret = -EINVAL; |
1402 | goto out; | |
1403 | } | |
1404 | ||
4fcac10d | 1405 | list_for_each_entry(link, &genpd->master_links, master_node) { |
bc0403ff | 1406 | if (link->slave == subdomain && link->master == genpd) { |
f721889f RW |
1407 | ret = -EINVAL; |
1408 | goto out; | |
1409 | } | |
1410 | } | |
1411 | ||
5063ce15 RW |
1412 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1413 | if (!link) { | |
1414 | ret = -ENOMEM; | |
1415 | goto out; | |
1416 | } | |
1417 | link->master = genpd; | |
1418 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1419 | link->slave = subdomain; |
1420 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
1421 | if (subdomain->status != GPD_STATE_POWER_OFF) | |
c4bb3160 | 1422 | genpd_sd_counter_inc(genpd); |
f721889f | 1423 | |
f721889f | 1424 | out: |
bc0403ff | 1425 | mutex_unlock(&subdomain->lock); |
ba2bbfbf | 1426 | mutex_unlock(&genpd->lock); |
f721889f RW |
1427 | |
1428 | return ret; | |
1429 | } | |
1430 | ||
fb7268be RW |
1431 | /** |
1432 | * pm_genpd_add_subdomain_names - Add a subdomain to an I/O PM domain. | |
1433 | * @master_name: Name of the master PM domain to add the subdomain to. | |
1434 | * @subdomain_name: Name of the subdomain to be added. | |
1435 | */ | |
1436 | int pm_genpd_add_subdomain_names(const char *master_name, | |
1437 | const char *subdomain_name) | |
1438 | { | |
1439 | struct generic_pm_domain *master = NULL, *subdomain = NULL, *gpd; | |
1440 | ||
1441 | if (IS_ERR_OR_NULL(master_name) || IS_ERR_OR_NULL(subdomain_name)) | |
1442 | return -EINVAL; | |
1443 | ||
1444 | mutex_lock(&gpd_list_lock); | |
1445 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
1446 | if (!master && !strcmp(gpd->name, master_name)) | |
1447 | master = gpd; | |
1448 | ||
1449 | if (!subdomain && !strcmp(gpd->name, subdomain_name)) | |
1450 | subdomain = gpd; | |
1451 | ||
1452 | if (master && subdomain) | |
1453 | break; | |
1454 | } | |
1455 | mutex_unlock(&gpd_list_lock); | |
1456 | ||
1457 | return pm_genpd_add_subdomain(master, subdomain); | |
1458 | } | |
1459 | ||
f721889f RW |
1460 | /** |
1461 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1462 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1463 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1464 | */ |
1465 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1466 | struct generic_pm_domain *subdomain) |
f721889f | 1467 | { |
5063ce15 | 1468 | struct gpd_link *link; |
f721889f RW |
1469 | int ret = -EINVAL; |
1470 | ||
5063ce15 | 1471 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1472 | return -EINVAL; |
1473 | ||
ba2bbfbf | 1474 | mutex_lock(&genpd->lock); |
f721889f | 1475 | |
5063ce15 RW |
1476 | list_for_each_entry(link, &genpd->master_links, master_node) { |
1477 | if (link->slave != subdomain) | |
f721889f RW |
1478 | continue; |
1479 | ||
1480 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); | |
1481 | ||
5063ce15 RW |
1482 | list_del(&link->master_node); |
1483 | list_del(&link->slave_node); | |
1484 | kfree(link); | |
17b75eca | 1485 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1486 | genpd_sd_counter_dec(genpd); |
1487 | ||
1488 | mutex_unlock(&subdomain->lock); | |
1489 | ||
1490 | ret = 0; | |
1491 | break; | |
1492 | } | |
1493 | ||
ba2bbfbf | 1494 | mutex_unlock(&genpd->lock); |
f721889f RW |
1495 | |
1496 | return ret; | |
1497 | } | |
1498 | ||
40114447 RW |
1499 | /** |
1500 | * pm_genpd_attach_cpuidle - Connect the given PM domain with cpuidle. | |
1501 | * @genpd: PM domain to be connected with cpuidle. | |
1502 | * @state: cpuidle state this domain can disable/enable. | |
1503 | * | |
1504 | * Make a PM domain behave as though it contained a CPU core, that is, instead | |
1505 | * of calling its power down routine it will enable the given cpuidle state so | |
1506 | * that the cpuidle subsystem can power it down (if possible and desirable). | |
1507 | */ | |
1508 | int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state) | |
cbc9ef02 RW |
1509 | { |
1510 | struct cpuidle_driver *cpuidle_drv; | |
f39cb179 | 1511 | struct gpd_cpuidle_data *cpuidle_data; |
cbc9ef02 RW |
1512 | struct cpuidle_state *idle_state; |
1513 | int ret = 0; | |
1514 | ||
1515 | if (IS_ERR_OR_NULL(genpd) || state < 0) | |
1516 | return -EINVAL; | |
1517 | ||
ba2bbfbf | 1518 | mutex_lock(&genpd->lock); |
cbc9ef02 | 1519 | |
f39cb179 | 1520 | if (genpd->cpuidle_data) { |
cbc9ef02 RW |
1521 | ret = -EEXIST; |
1522 | goto out; | |
1523 | } | |
f39cb179 UH |
1524 | cpuidle_data = kzalloc(sizeof(*cpuidle_data), GFP_KERNEL); |
1525 | if (!cpuidle_data) { | |
cbc9ef02 RW |
1526 | ret = -ENOMEM; |
1527 | goto out; | |
1528 | } | |
1529 | cpuidle_drv = cpuidle_driver_ref(); | |
1530 | if (!cpuidle_drv) { | |
1531 | ret = -ENODEV; | |
debe081a | 1532 | goto err_drv; |
cbc9ef02 RW |
1533 | } |
1534 | if (cpuidle_drv->state_count <= state) { | |
1535 | ret = -EINVAL; | |
1536 | goto err; | |
1537 | } | |
1538 | idle_state = &cpuidle_drv->states[state]; | |
1539 | if (!idle_state->disabled) { | |
1540 | ret = -EAGAIN; | |
1541 | goto err; | |
1542 | } | |
f39cb179 UH |
1543 | cpuidle_data->idle_state = idle_state; |
1544 | cpuidle_data->saved_exit_latency = idle_state->exit_latency; | |
1545 | genpd->cpuidle_data = cpuidle_data; | |
cbc9ef02 RW |
1546 | genpd_recalc_cpu_exit_latency(genpd); |
1547 | ||
1548 | out: | |
ba2bbfbf | 1549 | mutex_unlock(&genpd->lock); |
cbc9ef02 RW |
1550 | return ret; |
1551 | ||
1552 | err: | |
1553 | cpuidle_driver_unref(); | |
debe081a | 1554 | |
1555 | err_drv: | |
f39cb179 | 1556 | kfree(cpuidle_data); |
cbc9ef02 RW |
1557 | goto out; |
1558 | } | |
1559 | ||
74a2799a RW |
1560 | /** |
1561 | * pm_genpd_name_attach_cpuidle - Find PM domain and connect cpuidle to it. | |
1562 | * @name: Name of the domain to connect to cpuidle. | |
1563 | * @state: cpuidle state this domain can manipulate. | |
1564 | */ | |
1565 | int pm_genpd_name_attach_cpuidle(const char *name, int state) | |
1566 | { | |
1567 | return pm_genpd_attach_cpuidle(pm_genpd_lookup_name(name), state); | |
1568 | } | |
1569 | ||
40114447 RW |
1570 | /** |
1571 | * pm_genpd_detach_cpuidle - Remove the cpuidle connection from a PM domain. | |
1572 | * @genpd: PM domain to remove the cpuidle connection from. | |
1573 | * | |
1574 | * Remove the cpuidle connection set up by pm_genpd_attach_cpuidle() from the | |
1575 | * given PM domain. | |
1576 | */ | |
1577 | int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd) | |
cbc9ef02 | 1578 | { |
f39cb179 | 1579 | struct gpd_cpuidle_data *cpuidle_data; |
cbc9ef02 RW |
1580 | struct cpuidle_state *idle_state; |
1581 | int ret = 0; | |
1582 | ||
1583 | if (IS_ERR_OR_NULL(genpd)) | |
1584 | return -EINVAL; | |
1585 | ||
ba2bbfbf | 1586 | mutex_lock(&genpd->lock); |
cbc9ef02 | 1587 | |
f39cb179 UH |
1588 | cpuidle_data = genpd->cpuidle_data; |
1589 | if (!cpuidle_data) { | |
cbc9ef02 RW |
1590 | ret = -ENODEV; |
1591 | goto out; | |
1592 | } | |
f39cb179 | 1593 | idle_state = cpuidle_data->idle_state; |
cbc9ef02 RW |
1594 | if (!idle_state->disabled) { |
1595 | ret = -EAGAIN; | |
1596 | goto out; | |
1597 | } | |
f39cb179 | 1598 | idle_state->exit_latency = cpuidle_data->saved_exit_latency; |
cbc9ef02 | 1599 | cpuidle_driver_unref(); |
f39cb179 UH |
1600 | genpd->cpuidle_data = NULL; |
1601 | kfree(cpuidle_data); | |
cbc9ef02 RW |
1602 | |
1603 | out: | |
ba2bbfbf | 1604 | mutex_unlock(&genpd->lock); |
cbc9ef02 RW |
1605 | return ret; |
1606 | } | |
1607 | ||
74a2799a RW |
1608 | /** |
1609 | * pm_genpd_name_detach_cpuidle - Find PM domain and disconnect cpuidle from it. | |
1610 | * @name: Name of the domain to disconnect cpuidle from. | |
1611 | */ | |
1612 | int pm_genpd_name_detach_cpuidle(const char *name) | |
1613 | { | |
1614 | return pm_genpd_detach_cpuidle(pm_genpd_lookup_name(name)); | |
1615 | } | |
1616 | ||
d23b9b00 RW |
1617 | /* Default device callbacks for generic PM domains. */ |
1618 | ||
ecf00475 | 1619 | /** |
12e10bb6 | 1620 | * pm_genpd_default_save_state - Default "save device state" for PM domains. |
ecf00475 RW |
1621 | * @dev: Device to handle. |
1622 | */ | |
1623 | static int pm_genpd_default_save_state(struct device *dev) | |
1624 | { | |
1625 | int (*cb)(struct device *__dev); | |
ecf00475 | 1626 | |
0b589741 RW |
1627 | if (dev->type && dev->type->pm) |
1628 | cb = dev->type->pm->runtime_suspend; | |
1629 | else if (dev->class && dev->class->pm) | |
1630 | cb = dev->class->pm->runtime_suspend; | |
1631 | else if (dev->bus && dev->bus->pm) | |
1632 | cb = dev->bus->pm->runtime_suspend; | |
1633 | else | |
1634 | cb = NULL; | |
ecf00475 | 1635 | |
0b589741 RW |
1636 | if (!cb && dev->driver && dev->driver->pm) |
1637 | cb = dev->driver->pm->runtime_suspend; | |
1638 | ||
1639 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1640 | } |
1641 | ||
1642 | /** | |
12e10bb6 | 1643 | * pm_genpd_default_restore_state - Default PM domains "restore device state". |
ecf00475 RW |
1644 | * @dev: Device to handle. |
1645 | */ | |
1646 | static int pm_genpd_default_restore_state(struct device *dev) | |
1647 | { | |
1648 | int (*cb)(struct device *__dev); | |
ecf00475 | 1649 | |
0b589741 RW |
1650 | if (dev->type && dev->type->pm) |
1651 | cb = dev->type->pm->runtime_resume; | |
1652 | else if (dev->class && dev->class->pm) | |
1653 | cb = dev->class->pm->runtime_resume; | |
1654 | else if (dev->bus && dev->bus->pm) | |
1655 | cb = dev->bus->pm->runtime_resume; | |
1656 | else | |
1657 | cb = NULL; | |
ecf00475 | 1658 | |
0b589741 RW |
1659 | if (!cb && dev->driver && dev->driver->pm) |
1660 | cb = dev->driver->pm->runtime_resume; | |
1661 | ||
1662 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1663 | } |
1664 | ||
f721889f RW |
1665 | /** |
1666 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1667 | * @genpd: PM domain object to initialize. | |
1668 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1669 | * @is_off: Initial value of the domain's power_is_off field. | |
1670 | */ | |
1671 | void pm_genpd_init(struct generic_pm_domain *genpd, | |
1672 | struct dev_power_governor *gov, bool is_off) | |
1673 | { | |
1674 | if (IS_ERR_OR_NULL(genpd)) | |
1675 | return; | |
1676 | ||
5063ce15 RW |
1677 | INIT_LIST_HEAD(&genpd->master_links); |
1678 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1679 | INIT_LIST_HEAD(&genpd->dev_list); |
f721889f RW |
1680 | mutex_init(&genpd->lock); |
1681 | genpd->gov = gov; | |
1682 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
1683 | genpd->in_progress = 0; | |
c4bb3160 | 1684 | atomic_set(&genpd->sd_count, 0); |
17b75eca | 1685 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
596ba34b | 1686 | genpd->device_count = 0; |
221e9b58 | 1687 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1688 | genpd->max_off_time_changed = true; |
f721889f RW |
1689 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
1690 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; | |
596ba34b RW |
1691 | genpd->domain.ops.prepare = pm_genpd_prepare; |
1692 | genpd->domain.ops.suspend = pm_genpd_suspend; | |
0496c8ae | 1693 | genpd->domain.ops.suspend_late = pm_genpd_suspend_late; |
596ba34b RW |
1694 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; |
1695 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
0496c8ae | 1696 | genpd->domain.ops.resume_early = pm_genpd_resume_early; |
596ba34b RW |
1697 | genpd->domain.ops.resume = pm_genpd_resume; |
1698 | genpd->domain.ops.freeze = pm_genpd_freeze; | |
0496c8ae | 1699 | genpd->domain.ops.freeze_late = pm_genpd_freeze_late; |
596ba34b RW |
1700 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; |
1701 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
0496c8ae | 1702 | genpd->domain.ops.thaw_early = pm_genpd_thaw_early; |
596ba34b | 1703 | genpd->domain.ops.thaw = pm_genpd_thaw; |
d23b9b00 | 1704 | genpd->domain.ops.poweroff = pm_genpd_suspend; |
0496c8ae | 1705 | genpd->domain.ops.poweroff_late = pm_genpd_suspend_late; |
d23b9b00 | 1706 | genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; |
596ba34b | 1707 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
0496c8ae | 1708 | genpd->domain.ops.restore_early = pm_genpd_resume_early; |
d23b9b00 | 1709 | genpd->domain.ops.restore = pm_genpd_resume; |
596ba34b | 1710 | genpd->domain.ops.complete = pm_genpd_complete; |
ecf00475 RW |
1711 | genpd->dev_ops.save_state = pm_genpd_default_save_state; |
1712 | genpd->dev_ops.restore_state = pm_genpd_default_restore_state; | |
c11f6f5b UH |
1713 | |
1714 | if (genpd->flags & GENPD_FLAG_PM_CLK) { | |
1715 | genpd->dev_ops.stop = pm_clk_suspend; | |
1716 | genpd->dev_ops.start = pm_clk_resume; | |
1717 | } | |
1718 | ||
5125bbf3 RW |
1719 | mutex_lock(&gpd_list_lock); |
1720 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1721 | mutex_unlock(&gpd_list_lock); | |
1722 | } | |
be5ed55d | 1723 | EXPORT_SYMBOL_GPL(pm_genpd_init); |
aa42240a TF |
1724 | |
1725 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF | |
1726 | /* | |
1727 | * Device Tree based PM domain providers. | |
1728 | * | |
1729 | * The code below implements generic device tree based PM domain providers that | |
1730 | * bind device tree nodes with generic PM domains registered in the system. | |
1731 | * | |
1732 | * Any driver that registers generic PM domains and needs to support binding of | |
1733 | * devices to these domains is supposed to register a PM domain provider, which | |
1734 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
1735 | * | |
1736 | * Two simple mapping functions have been provided for convenience: | |
1737 | * - __of_genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. | |
1738 | * - __of_genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
1739 | * index. | |
1740 | */ | |
1741 | ||
1742 | /** | |
1743 | * struct of_genpd_provider - PM domain provider registration structure | |
1744 | * @link: Entry in global list of PM domain providers | |
1745 | * @node: Pointer to device tree node of PM domain provider | |
1746 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
1747 | * into a PM domain. | |
1748 | * @data: context pointer to be passed into @xlate callback | |
1749 | */ | |
1750 | struct of_genpd_provider { | |
1751 | struct list_head link; | |
1752 | struct device_node *node; | |
1753 | genpd_xlate_t xlate; | |
1754 | void *data; | |
1755 | }; | |
1756 | ||
1757 | /* List of registered PM domain providers. */ | |
1758 | static LIST_HEAD(of_genpd_providers); | |
1759 | /* Mutex to protect the list above. */ | |
1760 | static DEFINE_MUTEX(of_genpd_mutex); | |
1761 | ||
1762 | /** | |
1763 | * __of_genpd_xlate_simple() - Xlate function for direct node-domain mapping | |
1764 | * @genpdspec: OF phandle args to map into a PM domain | |
1765 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
1766 | * | |
1767 | * This is a generic xlate function that can be used to model PM domains that | |
1768 | * have their own device tree nodes. The private data of xlate function needs | |
1769 | * to be a valid pointer to struct generic_pm_domain. | |
1770 | */ | |
1771 | struct generic_pm_domain *__of_genpd_xlate_simple( | |
1772 | struct of_phandle_args *genpdspec, | |
1773 | void *data) | |
1774 | { | |
1775 | if (genpdspec->args_count != 0) | |
1776 | return ERR_PTR(-EINVAL); | |
1777 | return data; | |
1778 | } | |
1779 | EXPORT_SYMBOL_GPL(__of_genpd_xlate_simple); | |
1780 | ||
1781 | /** | |
1782 | * __of_genpd_xlate_onecell() - Xlate function using a single index. | |
1783 | * @genpdspec: OF phandle args to map into a PM domain | |
1784 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
1785 | * | |
1786 | * This is a generic xlate function that can be used to model simple PM domain | |
1787 | * controllers that have one device tree node and provide multiple PM domains. | |
1788 | * A single cell is used as an index into an array of PM domains specified in | |
1789 | * the genpd_onecell_data struct when registering the provider. | |
1790 | */ | |
1791 | struct generic_pm_domain *__of_genpd_xlate_onecell( | |
1792 | struct of_phandle_args *genpdspec, | |
1793 | void *data) | |
1794 | { | |
1795 | struct genpd_onecell_data *genpd_data = data; | |
1796 | unsigned int idx = genpdspec->args[0]; | |
1797 | ||
1798 | if (genpdspec->args_count != 1) | |
1799 | return ERR_PTR(-EINVAL); | |
1800 | ||
1801 | if (idx >= genpd_data->num_domains) { | |
1802 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
1803 | return ERR_PTR(-EINVAL); | |
1804 | } | |
1805 | ||
1806 | if (!genpd_data->domains[idx]) | |
1807 | return ERR_PTR(-ENOENT); | |
1808 | ||
1809 | return genpd_data->domains[idx]; | |
1810 | } | |
1811 | EXPORT_SYMBOL_GPL(__of_genpd_xlate_onecell); | |
1812 | ||
1813 | /** | |
1814 | * __of_genpd_add_provider() - Register a PM domain provider for a node | |
1815 | * @np: Device node pointer associated with the PM domain provider. | |
1816 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
1817 | * @data: Context pointer for @xlate callback. | |
1818 | */ | |
1819 | int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, | |
1820 | void *data) | |
1821 | { | |
1822 | struct of_genpd_provider *cp; | |
1823 | ||
1824 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
1825 | if (!cp) | |
1826 | return -ENOMEM; | |
1827 | ||
1828 | cp->node = of_node_get(np); | |
1829 | cp->data = data; | |
1830 | cp->xlate = xlate; | |
1831 | ||
1832 | mutex_lock(&of_genpd_mutex); | |
1833 | list_add(&cp->link, &of_genpd_providers); | |
1834 | mutex_unlock(&of_genpd_mutex); | |
1835 | pr_debug("Added domain provider from %s\n", np->full_name); | |
1836 | ||
1837 | return 0; | |
1838 | } | |
1839 | EXPORT_SYMBOL_GPL(__of_genpd_add_provider); | |
1840 | ||
1841 | /** | |
1842 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
1843 | * @np: Device node pointer associated with the PM domain provider | |
1844 | */ | |
1845 | void of_genpd_del_provider(struct device_node *np) | |
1846 | { | |
1847 | struct of_genpd_provider *cp; | |
1848 | ||
1849 | mutex_lock(&of_genpd_mutex); | |
1850 | list_for_each_entry(cp, &of_genpd_providers, link) { | |
1851 | if (cp->node == np) { | |
1852 | list_del(&cp->link); | |
1853 | of_node_put(cp->node); | |
1854 | kfree(cp); | |
1855 | break; | |
1856 | } | |
1857 | } | |
1858 | mutex_unlock(&of_genpd_mutex); | |
1859 | } | |
1860 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
1861 | ||
1862 | /** | |
1863 | * of_genpd_get_from_provider() - Look-up PM domain | |
1864 | * @genpdspec: OF phandle args to use for look-up | |
1865 | * | |
1866 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
1867 | * found, uses xlate function of the provider to map phandle args to a PM | |
1868 | * domain. | |
1869 | * | |
1870 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
1871 | * on failure. | |
1872 | */ | |
7496fcbe | 1873 | struct generic_pm_domain *of_genpd_get_from_provider( |
aa42240a TF |
1874 | struct of_phandle_args *genpdspec) |
1875 | { | |
1876 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
1877 | struct of_genpd_provider *provider; | |
1878 | ||
1879 | mutex_lock(&of_genpd_mutex); | |
1880 | ||
1881 | /* Check if we have such a provider in our array */ | |
1882 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
1883 | if (provider->node == genpdspec->np) | |
1884 | genpd = provider->xlate(genpdspec, provider->data); | |
1885 | if (!IS_ERR(genpd)) | |
1886 | break; | |
1887 | } | |
1888 | ||
1889 | mutex_unlock(&of_genpd_mutex); | |
1890 | ||
1891 | return genpd; | |
1892 | } | |
7496fcbe | 1893 | EXPORT_SYMBOL_GPL(of_genpd_get_from_provider); |
aa42240a TF |
1894 | |
1895 | /** | |
1896 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
8bb6944e | 1897 | * @dev: Device to detach. |
aa42240a TF |
1898 | * @power_off: Currently not used |
1899 | * | |
1900 | * Try to locate a corresponding generic PM domain, which the device was | |
1901 | * attached to previously. If such is found, the device is detached from it. | |
1902 | */ | |
1903 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
1904 | { | |
446d999c | 1905 | struct generic_pm_domain *pd; |
93af5e93 | 1906 | unsigned int i; |
aa42240a TF |
1907 | int ret = 0; |
1908 | ||
446d999c | 1909 | pd = pm_genpd_lookup_dev(dev); |
aa42240a TF |
1910 | if (!pd) |
1911 | return; | |
1912 | ||
1913 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
1914 | ||
93af5e93 | 1915 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
aa42240a TF |
1916 | ret = pm_genpd_remove_device(pd, dev); |
1917 | if (ret != -EAGAIN) | |
1918 | break; | |
93af5e93 GU |
1919 | |
1920 | mdelay(i); | |
aa42240a TF |
1921 | cond_resched(); |
1922 | } | |
1923 | ||
1924 | if (ret < 0) { | |
1925 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
1926 | pd->name, ret); | |
1927 | return; | |
1928 | } | |
1929 | ||
1930 | /* Check if PM domain can be powered off after removing this device. */ | |
1931 | genpd_queue_power_off_work(pd); | |
1932 | } | |
1933 | ||
632f7ce3 RK |
1934 | static void genpd_dev_pm_sync(struct device *dev) |
1935 | { | |
1936 | struct generic_pm_domain *pd; | |
1937 | ||
1938 | pd = dev_to_genpd(dev); | |
1939 | if (IS_ERR(pd)) | |
1940 | return; | |
1941 | ||
1942 | genpd_queue_power_off_work(pd); | |
1943 | } | |
1944 | ||
aa42240a TF |
1945 | /** |
1946 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
1947 | * @dev: Device to attach. | |
1948 | * | |
1949 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
1950 | * attaches the device to retrieved pm_domain ops. | |
1951 | * | |
1952 | * Both generic and legacy Samsung-specific DT bindings are supported to keep | |
1953 | * backwards compatibility with existing DTBs. | |
1954 | * | |
311fa6ad JH |
1955 | * Returns 0 on successfully attached PM domain or negative error code. Note |
1956 | * that if a power-domain exists for the device, but it cannot be found or | |
1957 | * turned on, then return -EPROBE_DEFER to ensure that the device is not | |
1958 | * probed and to re-try again later. | |
aa42240a TF |
1959 | */ |
1960 | int genpd_dev_pm_attach(struct device *dev) | |
1961 | { | |
1962 | struct of_phandle_args pd_args; | |
1963 | struct generic_pm_domain *pd; | |
93af5e93 | 1964 | unsigned int i; |
aa42240a TF |
1965 | int ret; |
1966 | ||
1967 | if (!dev->of_node) | |
1968 | return -ENODEV; | |
1969 | ||
1970 | if (dev->pm_domain) | |
1971 | return -EEXIST; | |
1972 | ||
1973 | ret = of_parse_phandle_with_args(dev->of_node, "power-domains", | |
1974 | "#power-domain-cells", 0, &pd_args); | |
1975 | if (ret < 0) { | |
1976 | if (ret != -ENOENT) | |
1977 | return ret; | |
1978 | ||
1979 | /* | |
1980 | * Try legacy Samsung-specific bindings | |
1981 | * (for backwards compatibility of DT ABI) | |
1982 | */ | |
1983 | pd_args.args_count = 0; | |
1984 | pd_args.np = of_parse_phandle(dev->of_node, | |
1985 | "samsung,power-domain", 0); | |
1986 | if (!pd_args.np) | |
1987 | return -ENOENT; | |
1988 | } | |
1989 | ||
1990 | pd = of_genpd_get_from_provider(&pd_args); | |
1991 | if (IS_ERR(pd)) { | |
1992 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", | |
1993 | __func__, PTR_ERR(pd)); | |
1994 | of_node_put(dev->of_node); | |
311fa6ad | 1995 | return -EPROBE_DEFER; |
aa42240a TF |
1996 | } |
1997 | ||
1998 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
1999 | ||
93af5e93 | 2000 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
aa42240a TF |
2001 | ret = pm_genpd_add_device(pd, dev); |
2002 | if (ret != -EAGAIN) | |
2003 | break; | |
93af5e93 GU |
2004 | |
2005 | mdelay(i); | |
aa42240a TF |
2006 | cond_resched(); |
2007 | } | |
2008 | ||
2009 | if (ret < 0) { | |
2010 | dev_err(dev, "failed to add to PM domain %s: %d", | |
2011 | pd->name, ret); | |
2012 | of_node_put(dev->of_node); | |
311fa6ad | 2013 | goto out; |
aa42240a TF |
2014 | } |
2015 | ||
2016 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
632f7ce3 | 2017 | dev->pm_domain->sync = genpd_dev_pm_sync; |
311fa6ad | 2018 | ret = pm_genpd_poweron(pd); |
aa42240a | 2019 | |
311fa6ad JH |
2020 | out: |
2021 | return ret ? -EPROBE_DEFER : 0; | |
aa42240a TF |
2022 | } |
2023 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); | |
d30d819d | 2024 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
2bd5306a MM |
2025 | |
2026 | ||
2027 | /*** debugfs support ***/ | |
2028 | ||
2029 | #ifdef CONFIG_PM_ADVANCED_DEBUG | |
2030 | #include <linux/pm.h> | |
2031 | #include <linux/device.h> | |
2032 | #include <linux/debugfs.h> | |
2033 | #include <linux/seq_file.h> | |
2034 | #include <linux/init.h> | |
2035 | #include <linux/kobject.h> | |
2036 | static struct dentry *pm_genpd_debugfs_dir; | |
2037 | ||
2038 | /* | |
2039 | * TODO: This function is a slightly modified version of rtpm_status_show | |
d30d819d | 2040 | * from sysfs.c, so generalize it. |
2bd5306a | 2041 | */ |
2bd5306a MM |
2042 | static void rtpm_status_str(struct seq_file *s, struct device *dev) |
2043 | { | |
2044 | static const char * const status_lookup[] = { | |
2045 | [RPM_ACTIVE] = "active", | |
2046 | [RPM_RESUMING] = "resuming", | |
2047 | [RPM_SUSPENDED] = "suspended", | |
2048 | [RPM_SUSPENDING] = "suspending" | |
2049 | }; | |
2050 | const char *p = ""; | |
2051 | ||
2052 | if (dev->power.runtime_error) | |
2053 | p = "error"; | |
2054 | else if (dev->power.disable_depth) | |
2055 | p = "unsupported"; | |
2056 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
2057 | p = status_lookup[dev->power.runtime_status]; | |
2058 | else | |
2059 | WARN_ON(1); | |
2060 | ||
2061 | seq_puts(s, p); | |
2062 | } | |
2bd5306a MM |
2063 | |
2064 | static int pm_genpd_summary_one(struct seq_file *s, | |
66a5ca4b | 2065 | struct generic_pm_domain *genpd) |
2bd5306a MM |
2066 | { |
2067 | static const char * const status_lookup[] = { | |
2068 | [GPD_STATE_ACTIVE] = "on", | |
2bd5306a MM |
2069 | [GPD_STATE_POWER_OFF] = "off" |
2070 | }; | |
2071 | struct pm_domain_data *pm_data; | |
2072 | const char *kobj_path; | |
2073 | struct gpd_link *link; | |
2074 | int ret; | |
2075 | ||
66a5ca4b | 2076 | ret = mutex_lock_interruptible(&genpd->lock); |
2bd5306a MM |
2077 | if (ret) |
2078 | return -ERESTARTSYS; | |
2079 | ||
66a5ca4b | 2080 | if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
2bd5306a | 2081 | goto exit; |
15dec67a | 2082 | seq_printf(s, "%-30s %-15s ", genpd->name, status_lookup[genpd->status]); |
2bd5306a MM |
2083 | |
2084 | /* | |
2085 | * Modifications on the list require holding locks on both | |
2086 | * master and slave, so we are safe. | |
66a5ca4b | 2087 | * Also genpd->name is immutable. |
2bd5306a | 2088 | */ |
66a5ca4b | 2089 | list_for_each_entry(link, &genpd->master_links, master_node) { |
2bd5306a | 2090 | seq_printf(s, "%s", link->slave->name); |
66a5ca4b | 2091 | if (!list_is_last(&link->master_node, &genpd->master_links)) |
2bd5306a MM |
2092 | seq_puts(s, ", "); |
2093 | } | |
2094 | ||
66a5ca4b | 2095 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
2bd5306a MM |
2096 | kobj_path = kobject_get_path(&pm_data->dev->kobj, GFP_KERNEL); |
2097 | if (kobj_path == NULL) | |
2098 | continue; | |
2099 | ||
2100 | seq_printf(s, "\n %-50s ", kobj_path); | |
2101 | rtpm_status_str(s, pm_data->dev); | |
2102 | kfree(kobj_path); | |
2103 | } | |
2104 | ||
2105 | seq_puts(s, "\n"); | |
2106 | exit: | |
66a5ca4b | 2107 | mutex_unlock(&genpd->lock); |
2bd5306a MM |
2108 | |
2109 | return 0; | |
2110 | } | |
2111 | ||
2112 | static int pm_genpd_summary_show(struct seq_file *s, void *data) | |
2113 | { | |
66a5ca4b | 2114 | struct generic_pm_domain *genpd; |
2bd5306a MM |
2115 | int ret = 0; |
2116 | ||
15dec67a GU |
2117 | seq_puts(s, "domain status slaves\n"); |
2118 | seq_puts(s, " /device runtime status\n"); | |
2bd5306a MM |
2119 | seq_puts(s, "----------------------------------------------------------------------\n"); |
2120 | ||
2121 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
2122 | if (ret) | |
2123 | return -ERESTARTSYS; | |
2124 | ||
66a5ca4b KH |
2125 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
2126 | ret = pm_genpd_summary_one(s, genpd); | |
2bd5306a MM |
2127 | if (ret) |
2128 | break; | |
2129 | } | |
2130 | mutex_unlock(&gpd_list_lock); | |
2131 | ||
2132 | return ret; | |
2133 | } | |
2134 | ||
2135 | static int pm_genpd_summary_open(struct inode *inode, struct file *file) | |
2136 | { | |
2137 | return single_open(file, pm_genpd_summary_show, NULL); | |
2138 | } | |
2139 | ||
2140 | static const struct file_operations pm_genpd_summary_fops = { | |
2141 | .open = pm_genpd_summary_open, | |
2142 | .read = seq_read, | |
2143 | .llseek = seq_lseek, | |
2144 | .release = single_release, | |
2145 | }; | |
2146 | ||
2147 | static int __init pm_genpd_debug_init(void) | |
2148 | { | |
2149 | struct dentry *d; | |
2150 | ||
2151 | pm_genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); | |
2152 | ||
2153 | if (!pm_genpd_debugfs_dir) | |
2154 | return -ENOMEM; | |
2155 | ||
2156 | d = debugfs_create_file("pm_genpd_summary", S_IRUGO, | |
2157 | pm_genpd_debugfs_dir, NULL, &pm_genpd_summary_fops); | |
2158 | if (!d) | |
2159 | return -ENOMEM; | |
2160 | ||
2161 | return 0; | |
2162 | } | |
2163 | late_initcall(pm_genpd_debug_init); | |
2164 | ||
2165 | static void __exit pm_genpd_debug_exit(void) | |
2166 | { | |
2167 | debugfs_remove_recursive(pm_genpd_debugfs_dir); | |
2168 | } | |
2169 | __exitcall(pm_genpd_debug_exit); | |
2170 | #endif /* CONFIG_PM_ADVANCED_DEBUG */ |