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 | ||
5248051b | 215 | /** |
5063ce15 | 216 | * __pm_genpd_poweron - Restore power to a given PM domain and its masters. |
5248051b RW |
217 | * @genpd: PM domain to power up. |
218 | * | |
5063ce15 | 219 | * Restore power to @genpd and all of its masters so that it is possible to |
5248051b RW |
220 | * resume a device belonging to it. |
221 | */ | |
8951ef02 | 222 | static int __pm_genpd_poweron(struct generic_pm_domain *genpd) |
5248051b | 223 | { |
5063ce15 | 224 | struct gpd_link *link; |
5248051b RW |
225 | int ret = 0; |
226 | ||
17b75eca | 227 | if (genpd->status == GPD_STATE_ACTIVE |
596ba34b | 228 | || (genpd->prepared_count > 0 && genpd->suspend_power_off)) |
3f241775 | 229 | return 0; |
5248051b | 230 | |
f39cb179 | 231 | if (genpd->cpuidle_data) { |
cbc9ef02 | 232 | cpuidle_pause_and_lock(); |
f39cb179 | 233 | genpd->cpuidle_data->idle_state->disabled = true; |
cbc9ef02 RW |
234 | cpuidle_resume_and_unlock(); |
235 | goto out; | |
236 | } | |
237 | ||
5063ce15 RW |
238 | /* |
239 | * The list is guaranteed not to change while the loop below is being | |
240 | * executed, unless one of the masters' .power_on() callbacks fiddles | |
241 | * with it. | |
242 | */ | |
243 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
244 | genpd_sd_counter_inc(link->master); | |
5248051b | 245 | |
5063ce15 | 246 | ret = pm_genpd_poweron(link->master); |
5063ce15 RW |
247 | if (ret) { |
248 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 249 | goto err; |
5063ce15 | 250 | } |
5248051b RW |
251 | } |
252 | ||
a4630c61 | 253 | ret = genpd_power_on(genpd, true); |
c8f0ea45 GU |
254 | if (ret) |
255 | goto err; | |
5248051b | 256 | |
cbc9ef02 | 257 | out: |
ba2bbfbf | 258 | genpd->status = GPD_STATE_ACTIVE; |
3f241775 | 259 | return 0; |
9e08cf42 RW |
260 | |
261 | err: | |
5063ce15 RW |
262 | list_for_each_entry_continue_reverse(link, &genpd->slave_links, slave_node) |
263 | genpd_sd_counter_dec(link->master); | |
9e08cf42 | 264 | |
3f241775 RW |
265 | return ret; |
266 | } | |
267 | ||
268 | /** | |
5063ce15 | 269 | * pm_genpd_poweron - Restore power to a given PM domain and its masters. |
3f241775 RW |
270 | * @genpd: PM domain to power up. |
271 | */ | |
272 | int pm_genpd_poweron(struct generic_pm_domain *genpd) | |
273 | { | |
274 | int ret; | |
275 | ||
276 | mutex_lock(&genpd->lock); | |
277 | ret = __pm_genpd_poweron(genpd); | |
278 | mutex_unlock(&genpd->lock); | |
279 | return ret; | |
5248051b RW |
280 | } |
281 | ||
8bc0251d RW |
282 | /** |
283 | * pm_genpd_name_poweron - Restore power to a given PM domain and its masters. | |
284 | * @domain_name: Name of the PM domain to power up. | |
285 | */ | |
286 | int pm_genpd_name_poweron(const char *domain_name) | |
287 | { | |
288 | struct generic_pm_domain *genpd; | |
289 | ||
290 | genpd = pm_genpd_lookup_name(domain_name); | |
291 | return genpd ? pm_genpd_poweron(genpd) : -EINVAL; | |
292 | } | |
293 | ||
8e9afafd RW |
294 | static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev) |
295 | { | |
296 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev, | |
297 | save_state_latency_ns, "state save"); | |
298 | } | |
299 | ||
ba2bbfbf UH |
300 | static int genpd_restore_dev(struct generic_pm_domain *genpd, |
301 | struct device *dev, bool timed) | |
8e9afafd | 302 | { |
ba2bbfbf UH |
303 | if (!timed) |
304 | return GENPD_DEV_CALLBACK(genpd, int, restore_state, dev); | |
305 | ||
8e9afafd RW |
306 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev, |
307 | restore_state_latency_ns, | |
308 | "state restore"); | |
309 | } | |
310 | ||
6ff7bb0d RW |
311 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
312 | unsigned long val, void *ptr) | |
313 | { | |
314 | struct generic_pm_domain_data *gpd_data; | |
315 | struct device *dev; | |
316 | ||
317 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); | |
6ff7bb0d | 318 | dev = gpd_data->base.dev; |
6ff7bb0d RW |
319 | |
320 | for (;;) { | |
321 | struct generic_pm_domain *genpd; | |
322 | struct pm_domain_data *pdd; | |
323 | ||
324 | spin_lock_irq(&dev->power.lock); | |
325 | ||
326 | pdd = dev->power.subsys_data ? | |
327 | dev->power.subsys_data->domain_data : NULL; | |
1d5fcfec | 328 | if (pdd && pdd->dev) { |
6ff7bb0d RW |
329 | to_gpd_data(pdd)->td.constraint_changed = true; |
330 | genpd = dev_to_genpd(dev); | |
331 | } else { | |
332 | genpd = ERR_PTR(-ENODATA); | |
333 | } | |
334 | ||
335 | spin_unlock_irq(&dev->power.lock); | |
336 | ||
337 | if (!IS_ERR(genpd)) { | |
338 | mutex_lock(&genpd->lock); | |
339 | genpd->max_off_time_changed = true; | |
340 | mutex_unlock(&genpd->lock); | |
341 | } | |
342 | ||
343 | dev = dev->parent; | |
344 | if (!dev || dev->power.ignore_children) | |
345 | break; | |
346 | } | |
347 | ||
348 | return NOTIFY_DONE; | |
349 | } | |
350 | ||
56375fd4 RW |
351 | /** |
352 | * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). | |
353 | * @genpd: PM domait to power off. | |
354 | * | |
355 | * Queue up the execution of pm_genpd_poweroff() unless it's already been done | |
356 | * before. | |
357 | */ | |
d971f0b0 | 358 | static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) |
56375fd4 | 359 | { |
a4ca26a4 | 360 | queue_work(pm_wq, &genpd->power_off_work); |
56375fd4 RW |
361 | } |
362 | ||
f721889f RW |
363 | /** |
364 | * pm_genpd_poweroff - Remove power from a given PM domain. | |
365 | * @genpd: PM domain to power down. | |
366 | * | |
367 | * If all of the @genpd's devices have been suspended and all of its subdomains | |
ba2bbfbf | 368 | * have been powered down, remove power from @genpd. |
f721889f RW |
369 | */ |
370 | static int pm_genpd_poweroff(struct generic_pm_domain *genpd) | |
371 | { | |
4605ab65 | 372 | struct pm_domain_data *pdd; |
5063ce15 | 373 | struct gpd_link *link; |
ba2bbfbf | 374 | unsigned int not_suspended = 0; |
f721889f | 375 | |
c6d22b37 RW |
376 | /* |
377 | * Do not try to power off the domain in the following situations: | |
378 | * (1) The domain is already in the "power off" state. | |
ba2bbfbf | 379 | * (2) System suspend is in progress. |
c6d22b37 | 380 | */ |
3f241775 | 381 | if (genpd->status == GPD_STATE_POWER_OFF |
ba2bbfbf | 382 | || genpd->prepared_count > 0) |
f721889f RW |
383 | return 0; |
384 | ||
c4bb3160 | 385 | if (atomic_read(&genpd->sd_count) > 0) |
f721889f RW |
386 | return -EBUSY; |
387 | ||
34b1f762 RW |
388 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
389 | enum pm_qos_flags_status stat; | |
390 | ||
391 | stat = dev_pm_qos_flags(pdd->dev, | |
392 | PM_QOS_FLAG_NO_POWER_OFF | |
393 | | PM_QOS_FLAG_REMOTE_WAKEUP); | |
394 | if (stat > PM_QOS_FLAGS_NONE) | |
395 | return -EBUSY; | |
396 | ||
0aa2a221 | 397 | if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev) |
feb70af0 | 398 | || pdd->dev->power.irq_safe)) |
f721889f | 399 | not_suspended++; |
34b1f762 | 400 | } |
f721889f RW |
401 | |
402 | if (not_suspended > genpd->in_progress) | |
403 | return -EBUSY; | |
404 | ||
405 | if (genpd->gov && genpd->gov->power_down_ok) { | |
406 | if (!genpd->gov->power_down_ok(&genpd->domain)) | |
407 | return -EAGAIN; | |
408 | } | |
409 | ||
f39cb179 | 410 | if (genpd->cpuidle_data) { |
cbc9ef02 | 411 | /* |
f39cb179 UH |
412 | * If cpuidle_data is set, cpuidle should turn the domain off |
413 | * when the CPU in it is idle. In that case we don't decrement | |
414 | * the subdomain counts of the master domains, so that power is | |
415 | * not removed from the current domain prematurely as a result | |
416 | * of cutting off the masters' power. | |
cbc9ef02 RW |
417 | */ |
418 | genpd->status = GPD_STATE_POWER_OFF; | |
419 | cpuidle_pause_and_lock(); | |
f39cb179 | 420 | genpd->cpuidle_data->idle_state->disabled = false; |
cbc9ef02 | 421 | cpuidle_resume_and_unlock(); |
ba2bbfbf | 422 | return 0; |
cbc9ef02 RW |
423 | } |
424 | ||
3c07cbc4 | 425 | if (genpd->power_off) { |
ba2bbfbf UH |
426 | int ret; |
427 | ||
428 | if (atomic_read(&genpd->sd_count) > 0) | |
429 | return -EBUSY; | |
17b75eca | 430 | |
3c07cbc4 | 431 | /* |
5063ce15 RW |
432 | * If sd_count > 0 at this point, one of the subdomains hasn't |
433 | * managed to call pm_genpd_poweron() for the master yet after | |
3c07cbc4 RW |
434 | * incrementing it. In that case pm_genpd_poweron() will wait |
435 | * for us to drop the lock, so we can call .power_off() and let | |
436 | * the pm_genpd_poweron() restore power for us (this shouldn't | |
437 | * happen very often). | |
438 | */ | |
a4630c61 | 439 | ret = genpd_power_off(genpd, true); |
ba2bbfbf UH |
440 | if (ret) |
441 | return ret; | |
d2805402 | 442 | } |
f721889f | 443 | |
17b75eca | 444 | genpd->status = GPD_STATE_POWER_OFF; |
221e9b58 | 445 | |
5063ce15 RW |
446 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
447 | genpd_sd_counter_dec(link->master); | |
448 | genpd_queue_power_off_work(link->master); | |
449 | } | |
f721889f | 450 | |
ba2bbfbf | 451 | return 0; |
f721889f RW |
452 | } |
453 | ||
454 | /** | |
455 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. | |
456 | * @work: Work structure used for scheduling the execution of this function. | |
457 | */ | |
458 | static void genpd_power_off_work_fn(struct work_struct *work) | |
459 | { | |
460 | struct generic_pm_domain *genpd; | |
461 | ||
462 | genpd = container_of(work, struct generic_pm_domain, power_off_work); | |
463 | ||
ba2bbfbf | 464 | mutex_lock(&genpd->lock); |
f721889f | 465 | pm_genpd_poweroff(genpd); |
ba2bbfbf | 466 | mutex_unlock(&genpd->lock); |
f721889f RW |
467 | } |
468 | ||
469 | /** | |
470 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. | |
471 | * @dev: Device to suspend. | |
472 | * | |
473 | * Carry out a runtime suspend of a device under the assumption that its | |
474 | * pm_domain field points to the domain member of an object of type | |
475 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
476 | */ | |
477 | static int pm_genpd_runtime_suspend(struct device *dev) | |
478 | { | |
479 | struct generic_pm_domain *genpd; | |
b02c999a | 480 | bool (*stop_ok)(struct device *__dev); |
d5e4cbfe | 481 | int ret; |
f721889f RW |
482 | |
483 | dev_dbg(dev, "%s()\n", __func__); | |
484 | ||
5248051b RW |
485 | genpd = dev_to_genpd(dev); |
486 | if (IS_ERR(genpd)) | |
f721889f RW |
487 | return -EINVAL; |
488 | ||
b02c999a RW |
489 | stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL; |
490 | if (stop_ok && !stop_ok(dev)) | |
491 | return -EBUSY; | |
492 | ||
ba2bbfbf | 493 | ret = genpd_save_dev(genpd, dev); |
d5e4cbfe RW |
494 | if (ret) |
495 | return ret; | |
17b75eca | 496 | |
ba2bbfbf UH |
497 | ret = genpd_stop_dev(genpd, dev); |
498 | if (ret) { | |
499 | genpd_restore_dev(genpd, dev, true); | |
500 | return ret; | |
501 | } | |
502 | ||
0aa2a221 RW |
503 | /* |
504 | * If power.irq_safe is set, this routine will be run with interrupts | |
505 | * off, so it can't use mutexes. | |
506 | */ | |
507 | if (dev->power.irq_safe) | |
508 | return 0; | |
509 | ||
c6d22b37 | 510 | mutex_lock(&genpd->lock); |
f721889f RW |
511 | genpd->in_progress++; |
512 | pm_genpd_poweroff(genpd); | |
513 | genpd->in_progress--; | |
c6d22b37 | 514 | mutex_unlock(&genpd->lock); |
f721889f RW |
515 | |
516 | return 0; | |
517 | } | |
518 | ||
f721889f RW |
519 | /** |
520 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. | |
521 | * @dev: Device to resume. | |
522 | * | |
523 | * Carry out a runtime resume of a device under the assumption that its | |
524 | * pm_domain field points to the domain member of an object of type | |
525 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
526 | */ | |
527 | static int pm_genpd_runtime_resume(struct device *dev) | |
528 | { | |
529 | struct generic_pm_domain *genpd; | |
f721889f | 530 | int ret; |
ba2bbfbf | 531 | bool timed = true; |
f721889f RW |
532 | |
533 | dev_dbg(dev, "%s()\n", __func__); | |
534 | ||
5248051b RW |
535 | genpd = dev_to_genpd(dev); |
536 | if (IS_ERR(genpd)) | |
f721889f RW |
537 | return -EINVAL; |
538 | ||
0aa2a221 | 539 | /* If power.irq_safe, the PM domain is never powered off. */ |
ba2bbfbf UH |
540 | if (dev->power.irq_safe) { |
541 | timed = false; | |
542 | goto out; | |
543 | } | |
0aa2a221 | 544 | |
c6d22b37 | 545 | mutex_lock(&genpd->lock); |
3f241775 | 546 | ret = __pm_genpd_poweron(genpd); |
ba2bbfbf | 547 | mutex_unlock(&genpd->lock); |
c6d22b37 | 548 | |
ba2bbfbf UH |
549 | if (ret) |
550 | return ret; | |
c6d22b37 | 551 | |
ba2bbfbf UH |
552 | out: |
553 | genpd_start_dev(genpd, dev, timed); | |
554 | genpd_restore_dev(genpd, dev, timed); | |
17b75eca | 555 | |
f721889f RW |
556 | return 0; |
557 | } | |
558 | ||
39ac5ba5 TB |
559 | static bool pd_ignore_unused; |
560 | static int __init pd_ignore_unused_setup(char *__unused) | |
561 | { | |
562 | pd_ignore_unused = true; | |
563 | return 1; | |
564 | } | |
565 | __setup("pd_ignore_unused", pd_ignore_unused_setup); | |
566 | ||
17f2ae7f RW |
567 | /** |
568 | * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. | |
569 | */ | |
570 | void pm_genpd_poweroff_unused(void) | |
571 | { | |
572 | struct generic_pm_domain *genpd; | |
573 | ||
39ac5ba5 TB |
574 | if (pd_ignore_unused) { |
575 | pr_warn("genpd: Not disabling unused power domains\n"); | |
576 | return; | |
577 | } | |
578 | ||
17f2ae7f RW |
579 | mutex_lock(&gpd_list_lock); |
580 | ||
581 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) | |
582 | genpd_queue_power_off_work(genpd); | |
583 | ||
584 | mutex_unlock(&gpd_list_lock); | |
585 | } | |
586 | ||
2fe71dcd UH |
587 | static int __init genpd_poweroff_unused(void) |
588 | { | |
589 | pm_genpd_poweroff_unused(); | |
590 | return 0; | |
591 | } | |
592 | late_initcall(genpd_poweroff_unused); | |
593 | ||
596ba34b RW |
594 | #ifdef CONFIG_PM_SLEEP |
595 | ||
77f827de RW |
596 | /** |
597 | * pm_genpd_present - Check if the given PM domain has been initialized. | |
598 | * @genpd: PM domain to check. | |
599 | */ | |
895b31f3 | 600 | static bool pm_genpd_present(const struct generic_pm_domain *genpd) |
77f827de | 601 | { |
895b31f3 | 602 | const struct generic_pm_domain *gpd; |
77f827de RW |
603 | |
604 | if (IS_ERR_OR_NULL(genpd)) | |
605 | return false; | |
606 | ||
607 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) | |
608 | if (gpd == genpd) | |
609 | return true; | |
610 | ||
611 | return false; | |
612 | } | |
613 | ||
d5e4cbfe RW |
614 | static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, |
615 | struct device *dev) | |
616 | { | |
617 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); | |
618 | } | |
619 | ||
596ba34b | 620 | /** |
5063ce15 | 621 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters. |
596ba34b | 622 | * @genpd: PM domain to power off, if possible. |
a4630c61 | 623 | * @timed: True if latency measurements are allowed. |
596ba34b RW |
624 | * |
625 | * Check if the given PM domain can be powered off (during system suspend or | |
5063ce15 | 626 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
596ba34b | 627 | * |
77f827de RW |
628 | * This function is only called in "noirq" and "syscore" stages of system power |
629 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
630 | * executed sequentially, so it is guaranteed that it will never run twice in | |
631 | * parallel). | |
596ba34b | 632 | */ |
a4630c61 GU |
633 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd, |
634 | bool timed) | |
596ba34b | 635 | { |
5063ce15 | 636 | struct gpd_link *link; |
596ba34b | 637 | |
17b75eca | 638 | if (genpd->status == GPD_STATE_POWER_OFF) |
596ba34b RW |
639 | return; |
640 | ||
c4bb3160 RW |
641 | if (genpd->suspended_count != genpd->device_count |
642 | || atomic_read(&genpd->sd_count) > 0) | |
596ba34b RW |
643 | return; |
644 | ||
a4630c61 | 645 | genpd_power_off(genpd, timed); |
596ba34b | 646 | |
17b75eca | 647 | genpd->status = GPD_STATE_POWER_OFF; |
5063ce15 RW |
648 | |
649 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
650 | genpd_sd_counter_dec(link->master); | |
a4630c61 | 651 | pm_genpd_sync_poweroff(link->master, timed); |
596ba34b RW |
652 | } |
653 | } | |
654 | ||
802d8b49 RW |
655 | /** |
656 | * pm_genpd_sync_poweron - Synchronously power on a PM domain and its masters. | |
657 | * @genpd: PM domain to power on. | |
a4630c61 | 658 | * @timed: True if latency measurements are allowed. |
802d8b49 | 659 | * |
77f827de RW |
660 | * This function is only called in "noirq" and "syscore" stages of system power |
661 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are | |
662 | * executed sequentially, so it is guaranteed that it will never run twice in | |
663 | * parallel). | |
802d8b49 | 664 | */ |
a4630c61 GU |
665 | static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd, |
666 | bool timed) | |
802d8b49 RW |
667 | { |
668 | struct gpd_link *link; | |
669 | ||
ba2bbfbf | 670 | if (genpd->status == GPD_STATE_ACTIVE) |
802d8b49 RW |
671 | return; |
672 | ||
673 | list_for_each_entry(link, &genpd->slave_links, slave_node) { | |
a4630c61 | 674 | pm_genpd_sync_poweron(link->master, timed); |
802d8b49 RW |
675 | genpd_sd_counter_inc(link->master); |
676 | } | |
677 | ||
a4630c61 | 678 | genpd_power_on(genpd, timed); |
802d8b49 RW |
679 | |
680 | genpd->status = GPD_STATE_ACTIVE; | |
681 | } | |
682 | ||
4ecd6e65 RW |
683 | /** |
684 | * resume_needed - Check whether to resume a device before system suspend. | |
685 | * @dev: Device to check. | |
686 | * @genpd: PM domain the device belongs to. | |
687 | * | |
688 | * There are two cases in which a device that can wake up the system from sleep | |
689 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled | |
690 | * to wake up the system and it has to remain active for this purpose while the | |
691 | * system is in the sleep state and (2) if the device is not enabled to wake up | |
692 | * the system from sleep states and it generally doesn't generate wakeup signals | |
693 | * by itself (those signals are generated on its behalf by other parts of the | |
694 | * system). In the latter case it may be necessary to reconfigure the device's | |
695 | * wakeup settings during system suspend, because it may have been set up to | |
696 | * signal remote wakeup from the system's working state as needed by runtime PM. | |
697 | * Return 'true' in either of the above cases. | |
698 | */ | |
699 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) | |
700 | { | |
701 | bool active_wakeup; | |
702 | ||
703 | if (!device_can_wakeup(dev)) | |
704 | return false; | |
705 | ||
d5e4cbfe | 706 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
4ecd6e65 RW |
707 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
708 | } | |
709 | ||
596ba34b RW |
710 | /** |
711 | * pm_genpd_prepare - Start power transition of a device in a PM domain. | |
712 | * @dev: Device to start the transition of. | |
713 | * | |
714 | * Start a power transition of a device (during a system-wide power transition) | |
715 | * under the assumption that its pm_domain field points to the domain member of | |
716 | * an object of type struct generic_pm_domain representing a PM domain | |
717 | * consisting of I/O devices. | |
718 | */ | |
719 | static int pm_genpd_prepare(struct device *dev) | |
720 | { | |
721 | struct generic_pm_domain *genpd; | |
b6c10c84 | 722 | int ret; |
596ba34b RW |
723 | |
724 | dev_dbg(dev, "%s()\n", __func__); | |
725 | ||
726 | genpd = dev_to_genpd(dev); | |
727 | if (IS_ERR(genpd)) | |
728 | return -EINVAL; | |
729 | ||
17b75eca RW |
730 | /* |
731 | * If a wakeup request is pending for the device, it should be woken up | |
732 | * at this point and a system wakeup event should be reported if it's | |
733 | * set up to wake up the system from sleep states. | |
734 | */ | |
735 | pm_runtime_get_noresume(dev); | |
736 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
737 | pm_wakeup_event(dev, 0); | |
738 | ||
739 | if (pm_wakeup_pending()) { | |
84167035 | 740 | pm_runtime_put(dev); |
17b75eca RW |
741 | return -EBUSY; |
742 | } | |
743 | ||
4ecd6e65 RW |
744 | if (resume_needed(dev, genpd)) |
745 | pm_runtime_resume(dev); | |
746 | ||
ba2bbfbf | 747 | mutex_lock(&genpd->lock); |
596ba34b | 748 | |
65533bbf RW |
749 | if (genpd->prepared_count++ == 0) { |
750 | genpd->suspended_count = 0; | |
17b75eca | 751 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
65533bbf | 752 | } |
17b75eca | 753 | |
ba2bbfbf | 754 | mutex_unlock(&genpd->lock); |
596ba34b RW |
755 | |
756 | if (genpd->suspend_power_off) { | |
17b75eca | 757 | pm_runtime_put_noidle(dev); |
596ba34b RW |
758 | return 0; |
759 | } | |
760 | ||
761 | /* | |
17b75eca RW |
762 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
763 | * so pm_genpd_poweron() will return immediately, but if the device | |
d5e4cbfe | 764 | * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need |
17b75eca | 765 | * to make it operational. |
596ba34b | 766 | */ |
17b75eca | 767 | pm_runtime_resume(dev); |
596ba34b RW |
768 | __pm_runtime_disable(dev, false); |
769 | ||
b6c10c84 RW |
770 | ret = pm_generic_prepare(dev); |
771 | if (ret) { | |
772 | mutex_lock(&genpd->lock); | |
773 | ||
774 | if (--genpd->prepared_count == 0) | |
775 | genpd->suspend_power_off = false; | |
776 | ||
777 | mutex_unlock(&genpd->lock); | |
17b75eca | 778 | pm_runtime_enable(dev); |
b6c10c84 | 779 | } |
17b75eca | 780 | |
84167035 | 781 | pm_runtime_put(dev); |
b6c10c84 | 782 | return ret; |
596ba34b RW |
783 | } |
784 | ||
785 | /** | |
786 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. | |
787 | * @dev: Device to suspend. | |
788 | * | |
789 | * Suspend a device under the assumption that its pm_domain field points to the | |
790 | * domain member of an object of type struct generic_pm_domain representing | |
791 | * a PM domain consisting of I/O devices. | |
792 | */ | |
793 | static int pm_genpd_suspend(struct device *dev) | |
794 | { | |
795 | struct generic_pm_domain *genpd; | |
796 | ||
797 | dev_dbg(dev, "%s()\n", __func__); | |
798 | ||
799 | genpd = dev_to_genpd(dev); | |
800 | if (IS_ERR(genpd)) | |
801 | return -EINVAL; | |
802 | ||
1e0407ca | 803 | return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev); |
596ba34b RW |
804 | } |
805 | ||
806 | /** | |
0496c8ae | 807 | * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain. |
596ba34b RW |
808 | * @dev: Device to suspend. |
809 | * | |
810 | * Carry out a late suspend of a device under the assumption that its | |
811 | * pm_domain field points to the domain member of an object of type | |
812 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. | |
813 | */ | |
0496c8ae | 814 | static int pm_genpd_suspend_late(struct device *dev) |
596ba34b RW |
815 | { |
816 | struct generic_pm_domain *genpd; | |
596ba34b RW |
817 | |
818 | dev_dbg(dev, "%s()\n", __func__); | |
819 | ||
820 | genpd = dev_to_genpd(dev); | |
821 | if (IS_ERR(genpd)) | |
822 | return -EINVAL; | |
823 | ||
1e0407ca | 824 | return genpd->suspend_power_off ? 0 : pm_generic_suspend_late(dev); |
0496c8ae | 825 | } |
596ba34b | 826 | |
0496c8ae RW |
827 | /** |
828 | * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. | |
829 | * @dev: Device to suspend. | |
830 | * | |
831 | * Stop the device and remove power from the domain if all devices in it have | |
832 | * been stopped. | |
833 | */ | |
834 | static int pm_genpd_suspend_noirq(struct device *dev) | |
835 | { | |
836 | struct generic_pm_domain *genpd; | |
837 | ||
838 | dev_dbg(dev, "%s()\n", __func__); | |
839 | ||
840 | genpd = dev_to_genpd(dev); | |
841 | if (IS_ERR(genpd)) | |
842 | return -EINVAL; | |
596ba34b | 843 | |
dbf37414 | 844 | if (genpd->suspend_power_off |
0496c8ae | 845 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
d4f2d87a RW |
846 | return 0; |
847 | ||
d5e4cbfe | 848 | genpd_stop_dev(genpd, dev); |
596ba34b RW |
849 | |
850 | /* | |
851 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
852 | * guaranteed that this function will never run twice in parallel for | |
853 | * the same PM domain, so it is not necessary to use locking here. | |
854 | */ | |
855 | genpd->suspended_count++; | |
a4630c61 | 856 | pm_genpd_sync_poweroff(genpd, true); |
596ba34b RW |
857 | |
858 | return 0; | |
859 | } | |
860 | ||
861 | /** | |
0496c8ae | 862 | * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
596ba34b RW |
863 | * @dev: Device to resume. |
864 | * | |
0496c8ae | 865 | * Restore power to the device's PM domain, if necessary, and start the device. |
596ba34b RW |
866 | */ |
867 | static int pm_genpd_resume_noirq(struct device *dev) | |
868 | { | |
869 | struct generic_pm_domain *genpd; | |
870 | ||
871 | dev_dbg(dev, "%s()\n", __func__); | |
872 | ||
873 | genpd = dev_to_genpd(dev); | |
874 | if (IS_ERR(genpd)) | |
875 | return -EINVAL; | |
876 | ||
dbf37414 | 877 | if (genpd->suspend_power_off |
cc85b207 | 878 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
596ba34b RW |
879 | return 0; |
880 | ||
881 | /* | |
882 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
883 | * guaranteed that this function will never run twice in parallel for | |
884 | * the same PM domain, so it is not necessary to use locking here. | |
885 | */ | |
a4630c61 | 886 | pm_genpd_sync_poweron(genpd, true); |
596ba34b | 887 | genpd->suspended_count--; |
596ba34b | 888 | |
ba2bbfbf | 889 | return genpd_start_dev(genpd, dev, true); |
596ba34b RW |
890 | } |
891 | ||
892 | /** | |
0496c8ae RW |
893 | * pm_genpd_resume_early - Early resume of a device in an I/O PM domain. |
894 | * @dev: Device to resume. | |
895 | * | |
896 | * Carry out an early resume of a device under the assumption that its | |
897 | * pm_domain field points to the domain member of an object of type | |
898 | * struct generic_pm_domain representing a power domain consisting of I/O | |
899 | * devices. | |
900 | */ | |
901 | static int pm_genpd_resume_early(struct device *dev) | |
902 | { | |
903 | struct generic_pm_domain *genpd; | |
904 | ||
905 | dev_dbg(dev, "%s()\n", __func__); | |
906 | ||
907 | genpd = dev_to_genpd(dev); | |
908 | if (IS_ERR(genpd)) | |
909 | return -EINVAL; | |
910 | ||
1e0407ca | 911 | return genpd->suspend_power_off ? 0 : pm_generic_resume_early(dev); |
0496c8ae RW |
912 | } |
913 | ||
914 | /** | |
915 | * pm_genpd_resume - Resume of device in an I/O PM domain. | |
596ba34b RW |
916 | * @dev: Device to resume. |
917 | * | |
918 | * Resume a device under the assumption that its pm_domain field points to the | |
919 | * domain member of an object of type struct generic_pm_domain representing | |
920 | * a power domain consisting of I/O devices. | |
921 | */ | |
922 | static int pm_genpd_resume(struct device *dev) | |
923 | { | |
924 | struct generic_pm_domain *genpd; | |
925 | ||
926 | dev_dbg(dev, "%s()\n", __func__); | |
927 | ||
928 | genpd = dev_to_genpd(dev); | |
929 | if (IS_ERR(genpd)) | |
930 | return -EINVAL; | |
931 | ||
1e0407ca | 932 | return genpd->suspend_power_off ? 0 : pm_generic_resume(dev); |
596ba34b RW |
933 | } |
934 | ||
935 | /** | |
0496c8ae | 936 | * pm_genpd_freeze - Freezing a device in an I/O PM domain. |
596ba34b RW |
937 | * @dev: Device to freeze. |
938 | * | |
939 | * Freeze a device under the assumption that its pm_domain field points to the | |
940 | * domain member of an object of type struct generic_pm_domain representing | |
941 | * a power domain consisting of I/O devices. | |
942 | */ | |
943 | static int pm_genpd_freeze(struct device *dev) | |
944 | { | |
945 | struct generic_pm_domain *genpd; | |
946 | ||
947 | dev_dbg(dev, "%s()\n", __func__); | |
948 | ||
949 | genpd = dev_to_genpd(dev); | |
950 | if (IS_ERR(genpd)) | |
951 | return -EINVAL; | |
952 | ||
1e0407ca | 953 | return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev); |
596ba34b RW |
954 | } |
955 | ||
956 | /** | |
0496c8ae RW |
957 | * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain. |
958 | * @dev: Device to freeze. | |
959 | * | |
960 | * Carry out a late freeze of a device under the assumption that its | |
961 | * pm_domain field points to the domain member of an object of type | |
962 | * struct generic_pm_domain representing a power domain consisting of I/O | |
963 | * devices. | |
964 | */ | |
965 | static int pm_genpd_freeze_late(struct device *dev) | |
966 | { | |
967 | struct generic_pm_domain *genpd; | |
968 | ||
969 | dev_dbg(dev, "%s()\n", __func__); | |
970 | ||
971 | genpd = dev_to_genpd(dev); | |
972 | if (IS_ERR(genpd)) | |
973 | return -EINVAL; | |
974 | ||
1e0407ca | 975 | return genpd->suspend_power_off ? 0 : pm_generic_freeze_late(dev); |
0496c8ae RW |
976 | } |
977 | ||
978 | /** | |
979 | * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. | |
596ba34b RW |
980 | * @dev: Device to freeze. |
981 | * | |
982 | * Carry out a late freeze of a device under the assumption that its | |
983 | * pm_domain field points to the domain member of an object of type | |
984 | * struct generic_pm_domain representing a power domain consisting of I/O | |
985 | * devices. | |
986 | */ | |
987 | static int pm_genpd_freeze_noirq(struct device *dev) | |
988 | { | |
989 | struct generic_pm_domain *genpd; | |
596ba34b RW |
990 | |
991 | dev_dbg(dev, "%s()\n", __func__); | |
992 | ||
993 | genpd = dev_to_genpd(dev); | |
994 | if (IS_ERR(genpd)) | |
995 | return -EINVAL; | |
996 | ||
dbf37414 | 997 | return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev); |
0496c8ae | 998 | } |
596ba34b | 999 | |
0496c8ae RW |
1000 | /** |
1001 | * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. | |
1002 | * @dev: Device to thaw. | |
1003 | * | |
1004 | * Start the device, unless power has been removed from the domain already | |
1005 | * before the system transition. | |
1006 | */ | |
1007 | static int pm_genpd_thaw_noirq(struct device *dev) | |
1008 | { | |
1009 | struct generic_pm_domain *genpd; | |
596ba34b | 1010 | |
0496c8ae | 1011 | dev_dbg(dev, "%s()\n", __func__); |
596ba34b | 1012 | |
0496c8ae RW |
1013 | genpd = dev_to_genpd(dev); |
1014 | if (IS_ERR(genpd)) | |
1015 | return -EINVAL; | |
1016 | ||
ba2bbfbf | 1017 | return genpd->suspend_power_off ? 0 : genpd_start_dev(genpd, dev, true); |
596ba34b RW |
1018 | } |
1019 | ||
1020 | /** | |
0496c8ae | 1021 | * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain. |
596ba34b RW |
1022 | * @dev: Device to thaw. |
1023 | * | |
1024 | * Carry out an early thaw of a device under the assumption that its | |
1025 | * pm_domain field points to the domain member of an object of type | |
1026 | * struct generic_pm_domain representing a power domain consisting of I/O | |
1027 | * devices. | |
1028 | */ | |
0496c8ae | 1029 | static int pm_genpd_thaw_early(struct device *dev) |
596ba34b RW |
1030 | { |
1031 | struct generic_pm_domain *genpd; | |
1032 | ||
1033 | dev_dbg(dev, "%s()\n", __func__); | |
1034 | ||
1035 | genpd = dev_to_genpd(dev); | |
1036 | if (IS_ERR(genpd)) | |
1037 | return -EINVAL; | |
1038 | ||
1e0407ca | 1039 | return genpd->suspend_power_off ? 0 : pm_generic_thaw_early(dev); |
596ba34b RW |
1040 | } |
1041 | ||
1042 | /** | |
1043 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. | |
1044 | * @dev: Device to thaw. | |
1045 | * | |
1046 | * Thaw a device under the assumption that its pm_domain field points to the | |
1047 | * domain member of an object of type struct generic_pm_domain representing | |
1048 | * a power domain consisting of I/O devices. | |
1049 | */ | |
1050 | static int pm_genpd_thaw(struct device *dev) | |
1051 | { | |
1052 | struct generic_pm_domain *genpd; | |
1053 | ||
1054 | dev_dbg(dev, "%s()\n", __func__); | |
1055 | ||
1056 | genpd = dev_to_genpd(dev); | |
1057 | if (IS_ERR(genpd)) | |
1058 | return -EINVAL; | |
1059 | ||
1e0407ca | 1060 | return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev); |
596ba34b RW |
1061 | } |
1062 | ||
1063 | /** | |
0496c8ae | 1064 | * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
596ba34b RW |
1065 | * @dev: Device to resume. |
1066 | * | |
0496c8ae RW |
1067 | * Make sure the domain will be in the same power state as before the |
1068 | * hibernation the system is resuming from and start the device if necessary. | |
596ba34b RW |
1069 | */ |
1070 | static int pm_genpd_restore_noirq(struct device *dev) | |
1071 | { | |
1072 | struct generic_pm_domain *genpd; | |
1073 | ||
1074 | dev_dbg(dev, "%s()\n", __func__); | |
1075 | ||
1076 | genpd = dev_to_genpd(dev); | |
1077 | if (IS_ERR(genpd)) | |
1078 | return -EINVAL; | |
1079 | ||
1080 | /* | |
1081 | * Since all of the "noirq" callbacks are executed sequentially, it is | |
1082 | * guaranteed that this function will never run twice in parallel for | |
1083 | * the same PM domain, so it is not necessary to use locking here. | |
65533bbf RW |
1084 | * |
1085 | * At this point suspended_count == 0 means we are being run for the | |
1086 | * first time for the given domain in the present cycle. | |
596ba34b | 1087 | */ |
65533bbf | 1088 | if (genpd->suspended_count++ == 0) { |
596ba34b | 1089 | /* |
65533bbf | 1090 | * The boot kernel might put the domain into arbitrary state, |
802d8b49 RW |
1091 | * so make it appear as powered off to pm_genpd_sync_poweron(), |
1092 | * so that it tries to power it on in case it was really off. | |
596ba34b | 1093 | */ |
65533bbf RW |
1094 | genpd->status = GPD_STATE_POWER_OFF; |
1095 | if (genpd->suspend_power_off) { | |
1096 | /* | |
1097 | * If the domain was off before the hibernation, make | |
1098 | * sure it will be off going forward. | |
1099 | */ | |
a4630c61 | 1100 | genpd_power_off(genpd, true); |
65533bbf RW |
1101 | |
1102 | return 0; | |
1103 | } | |
596ba34b RW |
1104 | } |
1105 | ||
18dd2ece RW |
1106 | if (genpd->suspend_power_off) |
1107 | return 0; | |
1108 | ||
a4630c61 | 1109 | pm_genpd_sync_poweron(genpd, true); |
596ba34b | 1110 | |
ba2bbfbf | 1111 | return genpd_start_dev(genpd, dev, true); |
596ba34b RW |
1112 | } |
1113 | ||
1114 | /** | |
1115 | * pm_genpd_complete - Complete power transition of a device in a power domain. | |
1116 | * @dev: Device to complete the transition of. | |
1117 | * | |
1118 | * Complete a power transition of a device (during a system-wide power | |
1119 | * transition) under the assumption that its pm_domain field points to the | |
1120 | * domain member of an object of type struct generic_pm_domain representing | |
1121 | * a power domain consisting of I/O devices. | |
1122 | */ | |
1123 | static void pm_genpd_complete(struct device *dev) | |
1124 | { | |
1125 | struct generic_pm_domain *genpd; | |
1126 | bool run_complete; | |
1127 | ||
1128 | dev_dbg(dev, "%s()\n", __func__); | |
1129 | ||
1130 | genpd = dev_to_genpd(dev); | |
1131 | if (IS_ERR(genpd)) | |
1132 | return; | |
1133 | ||
1134 | mutex_lock(&genpd->lock); | |
1135 | ||
1136 | run_complete = !genpd->suspend_power_off; | |
1137 | if (--genpd->prepared_count == 0) | |
1138 | genpd->suspend_power_off = false; | |
1139 | ||
1140 | mutex_unlock(&genpd->lock); | |
1141 | ||
1142 | if (run_complete) { | |
1143 | pm_generic_complete(dev); | |
6f00ff78 | 1144 | pm_runtime_set_active(dev); |
596ba34b | 1145 | pm_runtime_enable(dev); |
af939339 | 1146 | pm_request_idle(dev); |
596ba34b RW |
1147 | } |
1148 | } | |
1149 | ||
77f827de | 1150 | /** |
d47e6464 | 1151 | * genpd_syscore_switch - Switch power during system core suspend or resume. |
77f827de RW |
1152 | * @dev: Device that normally is marked as "always on" to switch power for. |
1153 | * | |
1154 | * This routine may only be called during the system core (syscore) suspend or | |
1155 | * resume phase for devices whose "always on" flags are set. | |
1156 | */ | |
d47e6464 | 1157 | static void genpd_syscore_switch(struct device *dev, bool suspend) |
77f827de RW |
1158 | { |
1159 | struct generic_pm_domain *genpd; | |
1160 | ||
1161 | genpd = dev_to_genpd(dev); | |
1162 | if (!pm_genpd_present(genpd)) | |
1163 | return; | |
1164 | ||
1165 | if (suspend) { | |
1166 | genpd->suspended_count++; | |
a4630c61 | 1167 | pm_genpd_sync_poweroff(genpd, false); |
77f827de | 1168 | } else { |
a4630c61 | 1169 | pm_genpd_sync_poweron(genpd, false); |
77f827de RW |
1170 | genpd->suspended_count--; |
1171 | } | |
1172 | } | |
d47e6464 UH |
1173 | |
1174 | void pm_genpd_syscore_poweroff(struct device *dev) | |
1175 | { | |
1176 | genpd_syscore_switch(dev, true); | |
1177 | } | |
1178 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff); | |
1179 | ||
1180 | void pm_genpd_syscore_poweron(struct device *dev) | |
1181 | { | |
1182 | genpd_syscore_switch(dev, false); | |
1183 | } | |
1184 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron); | |
77f827de | 1185 | |
d30d819d | 1186 | #else /* !CONFIG_PM_SLEEP */ |
596ba34b RW |
1187 | |
1188 | #define pm_genpd_prepare NULL | |
1189 | #define pm_genpd_suspend NULL | |
0496c8ae | 1190 | #define pm_genpd_suspend_late NULL |
596ba34b | 1191 | #define pm_genpd_suspend_noirq NULL |
0496c8ae | 1192 | #define pm_genpd_resume_early NULL |
596ba34b RW |
1193 | #define pm_genpd_resume_noirq NULL |
1194 | #define pm_genpd_resume NULL | |
1195 | #define pm_genpd_freeze NULL | |
0496c8ae | 1196 | #define pm_genpd_freeze_late NULL |
596ba34b | 1197 | #define pm_genpd_freeze_noirq NULL |
0496c8ae | 1198 | #define pm_genpd_thaw_early NULL |
596ba34b RW |
1199 | #define pm_genpd_thaw_noirq NULL |
1200 | #define pm_genpd_thaw NULL | |
596ba34b | 1201 | #define pm_genpd_restore_noirq NULL |
596ba34b RW |
1202 | #define pm_genpd_complete NULL |
1203 | ||
1204 | #endif /* CONFIG_PM_SLEEP */ | |
1205 | ||
f104e1e5 UH |
1206 | static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, |
1207 | struct generic_pm_domain *genpd, | |
1208 | struct gpd_timing_data *td) | |
1d5fcfec RW |
1209 | { |
1210 | struct generic_pm_domain_data *gpd_data; | |
3e235685 UH |
1211 | int ret; |
1212 | ||
1213 | ret = dev_pm_get_subsys_data(dev); | |
1214 | if (ret) | |
1215 | return ERR_PTR(ret); | |
1d5fcfec RW |
1216 | |
1217 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); | |
3e235685 UH |
1218 | if (!gpd_data) { |
1219 | ret = -ENOMEM; | |
1220 | goto err_put; | |
1221 | } | |
1d5fcfec | 1222 | |
f104e1e5 UH |
1223 | if (td) |
1224 | gpd_data->td = *td; | |
1225 | ||
1226 | gpd_data->base.dev = dev; | |
f104e1e5 UH |
1227 | gpd_data->td.constraint_changed = true; |
1228 | gpd_data->td.effective_constraint_ns = -1; | |
1229 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; | |
1230 | ||
1231 | spin_lock_irq(&dev->power.lock); | |
1232 | ||
1233 | if (dev->power.subsys_data->domain_data) { | |
1234 | ret = -EINVAL; | |
1235 | goto err_free; | |
1236 | } | |
1237 | ||
1238 | dev->power.subsys_data->domain_data = &gpd_data->base; | |
1239 | dev->pm_domain = &genpd->domain; | |
1240 | ||
1241 | spin_unlock_irq(&dev->power.lock); | |
1242 | ||
1d5fcfec | 1243 | return gpd_data; |
3e235685 | 1244 | |
f104e1e5 UH |
1245 | err_free: |
1246 | spin_unlock_irq(&dev->power.lock); | |
1247 | kfree(gpd_data); | |
3e235685 UH |
1248 | err_put: |
1249 | dev_pm_put_subsys_data(dev); | |
1250 | return ERR_PTR(ret); | |
1d5fcfec RW |
1251 | } |
1252 | ||
49d400c7 UH |
1253 | static void genpd_free_dev_data(struct device *dev, |
1254 | struct generic_pm_domain_data *gpd_data) | |
1d5fcfec | 1255 | { |
f104e1e5 UH |
1256 | spin_lock_irq(&dev->power.lock); |
1257 | ||
1258 | dev->pm_domain = NULL; | |
1259 | dev->power.subsys_data->domain_data = NULL; | |
1260 | ||
1261 | spin_unlock_irq(&dev->power.lock); | |
1262 | ||
1d5fcfec | 1263 | kfree(gpd_data); |
3e235685 | 1264 | dev_pm_put_subsys_data(dev); |
1d5fcfec RW |
1265 | } |
1266 | ||
f721889f | 1267 | /** |
b02c999a | 1268 | * __pm_genpd_add_device - Add a device to an I/O PM domain. |
f721889f RW |
1269 | * @genpd: PM domain to add the device to. |
1270 | * @dev: Device to be added. | |
b02c999a | 1271 | * @td: Set of PM QoS timing parameters to attach to the device. |
f721889f | 1272 | */ |
b02c999a RW |
1273 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1274 | struct gpd_timing_data *td) | |
f721889f | 1275 | { |
c0356db7 | 1276 | struct generic_pm_domain_data *gpd_data; |
f721889f RW |
1277 | int ret = 0; |
1278 | ||
1279 | dev_dbg(dev, "%s()\n", __func__); | |
1280 | ||
1281 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) | |
1282 | return -EINVAL; | |
1283 | ||
f104e1e5 | 1284 | gpd_data = genpd_alloc_dev_data(dev, genpd, td); |
3e235685 UH |
1285 | if (IS_ERR(gpd_data)) |
1286 | return PTR_ERR(gpd_data); | |
6ff7bb0d | 1287 | |
ba2bbfbf | 1288 | mutex_lock(&genpd->lock); |
f721889f | 1289 | |
596ba34b RW |
1290 | if (genpd->prepared_count > 0) { |
1291 | ret = -EAGAIN; | |
1292 | goto out; | |
1293 | } | |
1294 | ||
b472c2fa UH |
1295 | ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; |
1296 | if (ret) | |
1297 | goto out; | |
d79b6fe1 | 1298 | |
14b53064 UH |
1299 | genpd->device_count++; |
1300 | genpd->max_off_time_changed = true; | |
1301 | ||
1d5fcfec | 1302 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
6ff7bb0d | 1303 | |
f721889f | 1304 | out: |
ba2bbfbf | 1305 | mutex_unlock(&genpd->lock); |
f721889f | 1306 | |
c0356db7 UH |
1307 | if (ret) |
1308 | genpd_free_dev_data(dev, gpd_data); | |
1309 | else | |
1310 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); | |
1d5fcfec | 1311 | |
f721889f RW |
1312 | return ret; |
1313 | } | |
1314 | ||
b5abb085 RW |
1315 | /** |
1316 | * __pm_genpd_name_add_device - Find I/O PM domain and add a device to it. | |
1317 | * @domain_name: Name of the PM domain to add the device to. | |
1318 | * @dev: Device to be added. | |
1319 | * @td: Set of PM QoS timing parameters to attach to the device. | |
1320 | */ | |
1321 | int __pm_genpd_name_add_device(const char *domain_name, struct device *dev, | |
1322 | struct gpd_timing_data *td) | |
1323 | { | |
8bc0251d | 1324 | return __pm_genpd_add_device(pm_genpd_lookup_name(domain_name), dev, td); |
b5abb085 RW |
1325 | } |
1326 | ||
f721889f RW |
1327 | /** |
1328 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. | |
1329 | * @genpd: PM domain to remove the device from. | |
1330 | * @dev: Device to be removed. | |
1331 | */ | |
1332 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, | |
1333 | struct device *dev) | |
1334 | { | |
6ff7bb0d | 1335 | struct generic_pm_domain_data *gpd_data; |
4605ab65 | 1336 | struct pm_domain_data *pdd; |
efa69025 | 1337 | int ret = 0; |
f721889f RW |
1338 | |
1339 | dev_dbg(dev, "%s()\n", __func__); | |
1340 | ||
df6a0d6f | 1341 | if (!genpd || genpd != pm_genpd_lookup_dev(dev)) |
f721889f RW |
1342 | return -EINVAL; |
1343 | ||
c0356db7 UH |
1344 | /* The above validation also means we have existing domain_data. */ |
1345 | pdd = dev->power.subsys_data->domain_data; | |
1346 | gpd_data = to_gpd_data(pdd); | |
1347 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); | |
1348 | ||
ba2bbfbf | 1349 | mutex_lock(&genpd->lock); |
f721889f | 1350 | |
596ba34b RW |
1351 | if (genpd->prepared_count > 0) { |
1352 | ret = -EAGAIN; | |
1353 | goto out; | |
1354 | } | |
1355 | ||
6ff7bb0d RW |
1356 | genpd->device_count--; |
1357 | genpd->max_off_time_changed = true; | |
1358 | ||
d79b6fe1 | 1359 | if (genpd->detach_dev) |
c16561e8 | 1360 | genpd->detach_dev(genpd, dev); |
d79b6fe1 | 1361 | |
efa69025 | 1362 | list_del_init(&pdd->list_node); |
6ff7bb0d | 1363 | |
ba2bbfbf | 1364 | mutex_unlock(&genpd->lock); |
6ff7bb0d | 1365 | |
c1dbe2fb | 1366 | genpd_free_dev_data(dev, gpd_data); |
1d5fcfec | 1367 | |
6ff7bb0d | 1368 | return 0; |
f721889f | 1369 | |
596ba34b | 1370 | out: |
ba2bbfbf | 1371 | mutex_unlock(&genpd->lock); |
c0356db7 | 1372 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); |
f721889f RW |
1373 | |
1374 | return ret; | |
1375 | } | |
1376 | ||
1377 | /** | |
1378 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. | |
1379 | * @genpd: Master PM domain to add the subdomain to. | |
bc0403ff | 1380 | * @subdomain: Subdomain to be added. |
f721889f RW |
1381 | */ |
1382 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, | |
bc0403ff | 1383 | struct generic_pm_domain *subdomain) |
f721889f | 1384 | { |
5063ce15 | 1385 | struct gpd_link *link; |
f721889f RW |
1386 | int ret = 0; |
1387 | ||
fb7268be RW |
1388 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1389 | || genpd == subdomain) | |
f721889f RW |
1390 | return -EINVAL; |
1391 | ||
ba2bbfbf | 1392 | mutex_lock(&genpd->lock); |
bc0403ff | 1393 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); |
f721889f | 1394 | |
17b75eca | 1395 | if (genpd->status == GPD_STATE_POWER_OFF |
bc0403ff | 1396 | && subdomain->status != GPD_STATE_POWER_OFF) { |
f721889f RW |
1397 | ret = -EINVAL; |
1398 | goto out; | |
1399 | } | |
1400 | ||
4fcac10d | 1401 | list_for_each_entry(link, &genpd->master_links, master_node) { |
bc0403ff | 1402 | if (link->slave == subdomain && link->master == genpd) { |
f721889f RW |
1403 | ret = -EINVAL; |
1404 | goto out; | |
1405 | } | |
1406 | } | |
1407 | ||
5063ce15 RW |
1408 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1409 | if (!link) { | |
1410 | ret = -ENOMEM; | |
1411 | goto out; | |
1412 | } | |
1413 | link->master = genpd; | |
1414 | list_add_tail(&link->master_node, &genpd->master_links); | |
bc0403ff RW |
1415 | link->slave = subdomain; |
1416 | list_add_tail(&link->slave_node, &subdomain->slave_links); | |
1417 | if (subdomain->status != GPD_STATE_POWER_OFF) | |
c4bb3160 | 1418 | genpd_sd_counter_inc(genpd); |
f721889f | 1419 | |
f721889f | 1420 | out: |
bc0403ff | 1421 | mutex_unlock(&subdomain->lock); |
ba2bbfbf | 1422 | mutex_unlock(&genpd->lock); |
f721889f RW |
1423 | |
1424 | return ret; | |
1425 | } | |
1426 | ||
fb7268be RW |
1427 | /** |
1428 | * pm_genpd_add_subdomain_names - Add a subdomain to an I/O PM domain. | |
1429 | * @master_name: Name of the master PM domain to add the subdomain to. | |
1430 | * @subdomain_name: Name of the subdomain to be added. | |
1431 | */ | |
1432 | int pm_genpd_add_subdomain_names(const char *master_name, | |
1433 | const char *subdomain_name) | |
1434 | { | |
1435 | struct generic_pm_domain *master = NULL, *subdomain = NULL, *gpd; | |
1436 | ||
1437 | if (IS_ERR_OR_NULL(master_name) || IS_ERR_OR_NULL(subdomain_name)) | |
1438 | return -EINVAL; | |
1439 | ||
1440 | mutex_lock(&gpd_list_lock); | |
1441 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { | |
1442 | if (!master && !strcmp(gpd->name, master_name)) | |
1443 | master = gpd; | |
1444 | ||
1445 | if (!subdomain && !strcmp(gpd->name, subdomain_name)) | |
1446 | subdomain = gpd; | |
1447 | ||
1448 | if (master && subdomain) | |
1449 | break; | |
1450 | } | |
1451 | mutex_unlock(&gpd_list_lock); | |
1452 | ||
1453 | return pm_genpd_add_subdomain(master, subdomain); | |
1454 | } | |
1455 | ||
f721889f RW |
1456 | /** |
1457 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. | |
1458 | * @genpd: Master PM domain to remove the subdomain from. | |
5063ce15 | 1459 | * @subdomain: Subdomain to be removed. |
f721889f RW |
1460 | */ |
1461 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, | |
5063ce15 | 1462 | struct generic_pm_domain *subdomain) |
f721889f | 1463 | { |
5063ce15 | 1464 | struct gpd_link *link; |
f721889f RW |
1465 | int ret = -EINVAL; |
1466 | ||
5063ce15 | 1467 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
f721889f RW |
1468 | return -EINVAL; |
1469 | ||
ba2bbfbf | 1470 | mutex_lock(&genpd->lock); |
f721889f | 1471 | |
5063ce15 RW |
1472 | list_for_each_entry(link, &genpd->master_links, master_node) { |
1473 | if (link->slave != subdomain) | |
f721889f RW |
1474 | continue; |
1475 | ||
1476 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); | |
1477 | ||
5063ce15 RW |
1478 | list_del(&link->master_node); |
1479 | list_del(&link->slave_node); | |
1480 | kfree(link); | |
17b75eca | 1481 | if (subdomain->status != GPD_STATE_POWER_OFF) |
f721889f RW |
1482 | genpd_sd_counter_dec(genpd); |
1483 | ||
1484 | mutex_unlock(&subdomain->lock); | |
1485 | ||
1486 | ret = 0; | |
1487 | break; | |
1488 | } | |
1489 | ||
ba2bbfbf | 1490 | mutex_unlock(&genpd->lock); |
f721889f RW |
1491 | |
1492 | return ret; | |
1493 | } | |
1494 | ||
40114447 RW |
1495 | /** |
1496 | * pm_genpd_attach_cpuidle - Connect the given PM domain with cpuidle. | |
1497 | * @genpd: PM domain to be connected with cpuidle. | |
1498 | * @state: cpuidle state this domain can disable/enable. | |
1499 | * | |
1500 | * Make a PM domain behave as though it contained a CPU core, that is, instead | |
1501 | * of calling its power down routine it will enable the given cpuidle state so | |
1502 | * that the cpuidle subsystem can power it down (if possible and desirable). | |
1503 | */ | |
1504 | int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state) | |
cbc9ef02 RW |
1505 | { |
1506 | struct cpuidle_driver *cpuidle_drv; | |
f39cb179 | 1507 | struct gpd_cpuidle_data *cpuidle_data; |
cbc9ef02 RW |
1508 | struct cpuidle_state *idle_state; |
1509 | int ret = 0; | |
1510 | ||
1511 | if (IS_ERR_OR_NULL(genpd) || state < 0) | |
1512 | return -EINVAL; | |
1513 | ||
ba2bbfbf | 1514 | mutex_lock(&genpd->lock); |
cbc9ef02 | 1515 | |
f39cb179 | 1516 | if (genpd->cpuidle_data) { |
cbc9ef02 RW |
1517 | ret = -EEXIST; |
1518 | goto out; | |
1519 | } | |
f39cb179 UH |
1520 | cpuidle_data = kzalloc(sizeof(*cpuidle_data), GFP_KERNEL); |
1521 | if (!cpuidle_data) { | |
cbc9ef02 RW |
1522 | ret = -ENOMEM; |
1523 | goto out; | |
1524 | } | |
1525 | cpuidle_drv = cpuidle_driver_ref(); | |
1526 | if (!cpuidle_drv) { | |
1527 | ret = -ENODEV; | |
debe081a | 1528 | goto err_drv; |
cbc9ef02 RW |
1529 | } |
1530 | if (cpuidle_drv->state_count <= state) { | |
1531 | ret = -EINVAL; | |
1532 | goto err; | |
1533 | } | |
1534 | idle_state = &cpuidle_drv->states[state]; | |
1535 | if (!idle_state->disabled) { | |
1536 | ret = -EAGAIN; | |
1537 | goto err; | |
1538 | } | |
f39cb179 UH |
1539 | cpuidle_data->idle_state = idle_state; |
1540 | cpuidle_data->saved_exit_latency = idle_state->exit_latency; | |
1541 | genpd->cpuidle_data = cpuidle_data; | |
cbc9ef02 RW |
1542 | genpd_recalc_cpu_exit_latency(genpd); |
1543 | ||
1544 | out: | |
ba2bbfbf | 1545 | mutex_unlock(&genpd->lock); |
cbc9ef02 RW |
1546 | return ret; |
1547 | ||
1548 | err: | |
1549 | cpuidle_driver_unref(); | |
debe081a | 1550 | |
1551 | err_drv: | |
f39cb179 | 1552 | kfree(cpuidle_data); |
cbc9ef02 RW |
1553 | goto out; |
1554 | } | |
1555 | ||
74a2799a RW |
1556 | /** |
1557 | * pm_genpd_name_attach_cpuidle - Find PM domain and connect cpuidle to it. | |
1558 | * @name: Name of the domain to connect to cpuidle. | |
1559 | * @state: cpuidle state this domain can manipulate. | |
1560 | */ | |
1561 | int pm_genpd_name_attach_cpuidle(const char *name, int state) | |
1562 | { | |
1563 | return pm_genpd_attach_cpuidle(pm_genpd_lookup_name(name), state); | |
1564 | } | |
1565 | ||
40114447 RW |
1566 | /** |
1567 | * pm_genpd_detach_cpuidle - Remove the cpuidle connection from a PM domain. | |
1568 | * @genpd: PM domain to remove the cpuidle connection from. | |
1569 | * | |
1570 | * Remove the cpuidle connection set up by pm_genpd_attach_cpuidle() from the | |
1571 | * given PM domain. | |
1572 | */ | |
1573 | int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd) | |
cbc9ef02 | 1574 | { |
f39cb179 | 1575 | struct gpd_cpuidle_data *cpuidle_data; |
cbc9ef02 RW |
1576 | struct cpuidle_state *idle_state; |
1577 | int ret = 0; | |
1578 | ||
1579 | if (IS_ERR_OR_NULL(genpd)) | |
1580 | return -EINVAL; | |
1581 | ||
ba2bbfbf | 1582 | mutex_lock(&genpd->lock); |
cbc9ef02 | 1583 | |
f39cb179 UH |
1584 | cpuidle_data = genpd->cpuidle_data; |
1585 | if (!cpuidle_data) { | |
cbc9ef02 RW |
1586 | ret = -ENODEV; |
1587 | goto out; | |
1588 | } | |
f39cb179 | 1589 | idle_state = cpuidle_data->idle_state; |
cbc9ef02 RW |
1590 | if (!idle_state->disabled) { |
1591 | ret = -EAGAIN; | |
1592 | goto out; | |
1593 | } | |
f39cb179 | 1594 | idle_state->exit_latency = cpuidle_data->saved_exit_latency; |
cbc9ef02 | 1595 | cpuidle_driver_unref(); |
f39cb179 UH |
1596 | genpd->cpuidle_data = NULL; |
1597 | kfree(cpuidle_data); | |
cbc9ef02 RW |
1598 | |
1599 | out: | |
ba2bbfbf | 1600 | mutex_unlock(&genpd->lock); |
cbc9ef02 RW |
1601 | return ret; |
1602 | } | |
1603 | ||
74a2799a RW |
1604 | /** |
1605 | * pm_genpd_name_detach_cpuidle - Find PM domain and disconnect cpuidle from it. | |
1606 | * @name: Name of the domain to disconnect cpuidle from. | |
1607 | */ | |
1608 | int pm_genpd_name_detach_cpuidle(const char *name) | |
1609 | { | |
1610 | return pm_genpd_detach_cpuidle(pm_genpd_lookup_name(name)); | |
1611 | } | |
1612 | ||
d23b9b00 RW |
1613 | /* Default device callbacks for generic PM domains. */ |
1614 | ||
ecf00475 | 1615 | /** |
12e10bb6 | 1616 | * pm_genpd_default_save_state - Default "save device state" for PM domains. |
ecf00475 RW |
1617 | * @dev: Device to handle. |
1618 | */ | |
1619 | static int pm_genpd_default_save_state(struct device *dev) | |
1620 | { | |
1621 | int (*cb)(struct device *__dev); | |
ecf00475 | 1622 | |
0b589741 RW |
1623 | if (dev->type && dev->type->pm) |
1624 | cb = dev->type->pm->runtime_suspend; | |
1625 | else if (dev->class && dev->class->pm) | |
1626 | cb = dev->class->pm->runtime_suspend; | |
1627 | else if (dev->bus && dev->bus->pm) | |
1628 | cb = dev->bus->pm->runtime_suspend; | |
1629 | else | |
1630 | cb = NULL; | |
ecf00475 | 1631 | |
0b589741 RW |
1632 | if (!cb && dev->driver && dev->driver->pm) |
1633 | cb = dev->driver->pm->runtime_suspend; | |
1634 | ||
1635 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1636 | } |
1637 | ||
1638 | /** | |
12e10bb6 | 1639 | * pm_genpd_default_restore_state - Default PM domains "restore device state". |
ecf00475 RW |
1640 | * @dev: Device to handle. |
1641 | */ | |
1642 | static int pm_genpd_default_restore_state(struct device *dev) | |
1643 | { | |
1644 | int (*cb)(struct device *__dev); | |
ecf00475 | 1645 | |
0b589741 RW |
1646 | if (dev->type && dev->type->pm) |
1647 | cb = dev->type->pm->runtime_resume; | |
1648 | else if (dev->class && dev->class->pm) | |
1649 | cb = dev->class->pm->runtime_resume; | |
1650 | else if (dev->bus && dev->bus->pm) | |
1651 | cb = dev->bus->pm->runtime_resume; | |
1652 | else | |
1653 | cb = NULL; | |
ecf00475 | 1654 | |
0b589741 RW |
1655 | if (!cb && dev->driver && dev->driver->pm) |
1656 | cb = dev->driver->pm->runtime_resume; | |
1657 | ||
1658 | return cb ? cb(dev) : 0; | |
ecf00475 RW |
1659 | } |
1660 | ||
f721889f RW |
1661 | /** |
1662 | * pm_genpd_init - Initialize a generic I/O PM domain object. | |
1663 | * @genpd: PM domain object to initialize. | |
1664 | * @gov: PM domain governor to associate with the domain (may be NULL). | |
1665 | * @is_off: Initial value of the domain's power_is_off field. | |
1666 | */ | |
1667 | void pm_genpd_init(struct generic_pm_domain *genpd, | |
1668 | struct dev_power_governor *gov, bool is_off) | |
1669 | { | |
1670 | if (IS_ERR_OR_NULL(genpd)) | |
1671 | return; | |
1672 | ||
5063ce15 RW |
1673 | INIT_LIST_HEAD(&genpd->master_links); |
1674 | INIT_LIST_HEAD(&genpd->slave_links); | |
f721889f | 1675 | INIT_LIST_HEAD(&genpd->dev_list); |
f721889f RW |
1676 | mutex_init(&genpd->lock); |
1677 | genpd->gov = gov; | |
1678 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); | |
1679 | genpd->in_progress = 0; | |
c4bb3160 | 1680 | atomic_set(&genpd->sd_count, 0); |
17b75eca | 1681 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
596ba34b | 1682 | genpd->device_count = 0; |
221e9b58 | 1683 | genpd->max_off_time_ns = -1; |
6ff7bb0d | 1684 | genpd->max_off_time_changed = true; |
f721889f RW |
1685 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
1686 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; | |
596ba34b RW |
1687 | genpd->domain.ops.prepare = pm_genpd_prepare; |
1688 | genpd->domain.ops.suspend = pm_genpd_suspend; | |
0496c8ae | 1689 | genpd->domain.ops.suspend_late = pm_genpd_suspend_late; |
596ba34b RW |
1690 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; |
1691 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; | |
0496c8ae | 1692 | genpd->domain.ops.resume_early = pm_genpd_resume_early; |
596ba34b RW |
1693 | genpd->domain.ops.resume = pm_genpd_resume; |
1694 | genpd->domain.ops.freeze = pm_genpd_freeze; | |
0496c8ae | 1695 | genpd->domain.ops.freeze_late = pm_genpd_freeze_late; |
596ba34b RW |
1696 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; |
1697 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; | |
0496c8ae | 1698 | genpd->domain.ops.thaw_early = pm_genpd_thaw_early; |
596ba34b | 1699 | genpd->domain.ops.thaw = pm_genpd_thaw; |
d23b9b00 | 1700 | genpd->domain.ops.poweroff = pm_genpd_suspend; |
0496c8ae | 1701 | genpd->domain.ops.poweroff_late = pm_genpd_suspend_late; |
d23b9b00 | 1702 | genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; |
596ba34b | 1703 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
0496c8ae | 1704 | genpd->domain.ops.restore_early = pm_genpd_resume_early; |
d23b9b00 | 1705 | genpd->domain.ops.restore = pm_genpd_resume; |
596ba34b | 1706 | genpd->domain.ops.complete = pm_genpd_complete; |
ecf00475 RW |
1707 | genpd->dev_ops.save_state = pm_genpd_default_save_state; |
1708 | genpd->dev_ops.restore_state = pm_genpd_default_restore_state; | |
c11f6f5b UH |
1709 | |
1710 | if (genpd->flags & GENPD_FLAG_PM_CLK) { | |
1711 | genpd->dev_ops.stop = pm_clk_suspend; | |
1712 | genpd->dev_ops.start = pm_clk_resume; | |
1713 | } | |
1714 | ||
5125bbf3 RW |
1715 | mutex_lock(&gpd_list_lock); |
1716 | list_add(&genpd->gpd_list_node, &gpd_list); | |
1717 | mutex_unlock(&gpd_list_lock); | |
1718 | } | |
be5ed55d | 1719 | EXPORT_SYMBOL_GPL(pm_genpd_init); |
aa42240a TF |
1720 | |
1721 | #ifdef CONFIG_PM_GENERIC_DOMAINS_OF | |
1722 | /* | |
1723 | * Device Tree based PM domain providers. | |
1724 | * | |
1725 | * The code below implements generic device tree based PM domain providers that | |
1726 | * bind device tree nodes with generic PM domains registered in the system. | |
1727 | * | |
1728 | * Any driver that registers generic PM domains and needs to support binding of | |
1729 | * devices to these domains is supposed to register a PM domain provider, which | |
1730 | * maps a PM domain specifier retrieved from the device tree to a PM domain. | |
1731 | * | |
1732 | * Two simple mapping functions have been provided for convenience: | |
1733 | * - __of_genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. | |
1734 | * - __of_genpd_xlate_onecell() for mapping of multiple PM domains per node by | |
1735 | * index. | |
1736 | */ | |
1737 | ||
1738 | /** | |
1739 | * struct of_genpd_provider - PM domain provider registration structure | |
1740 | * @link: Entry in global list of PM domain providers | |
1741 | * @node: Pointer to device tree node of PM domain provider | |
1742 | * @xlate: Provider-specific xlate callback mapping a set of specifier cells | |
1743 | * into a PM domain. | |
1744 | * @data: context pointer to be passed into @xlate callback | |
1745 | */ | |
1746 | struct of_genpd_provider { | |
1747 | struct list_head link; | |
1748 | struct device_node *node; | |
1749 | genpd_xlate_t xlate; | |
1750 | void *data; | |
1751 | }; | |
1752 | ||
1753 | /* List of registered PM domain providers. */ | |
1754 | static LIST_HEAD(of_genpd_providers); | |
1755 | /* Mutex to protect the list above. */ | |
1756 | static DEFINE_MUTEX(of_genpd_mutex); | |
1757 | ||
1758 | /** | |
1759 | * __of_genpd_xlate_simple() - Xlate function for direct node-domain mapping | |
1760 | * @genpdspec: OF phandle args to map into a PM domain | |
1761 | * @data: xlate function private data - pointer to struct generic_pm_domain | |
1762 | * | |
1763 | * This is a generic xlate function that can be used to model PM domains that | |
1764 | * have their own device tree nodes. The private data of xlate function needs | |
1765 | * to be a valid pointer to struct generic_pm_domain. | |
1766 | */ | |
1767 | struct generic_pm_domain *__of_genpd_xlate_simple( | |
1768 | struct of_phandle_args *genpdspec, | |
1769 | void *data) | |
1770 | { | |
1771 | if (genpdspec->args_count != 0) | |
1772 | return ERR_PTR(-EINVAL); | |
1773 | return data; | |
1774 | } | |
1775 | EXPORT_SYMBOL_GPL(__of_genpd_xlate_simple); | |
1776 | ||
1777 | /** | |
1778 | * __of_genpd_xlate_onecell() - Xlate function using a single index. | |
1779 | * @genpdspec: OF phandle args to map into a PM domain | |
1780 | * @data: xlate function private data - pointer to struct genpd_onecell_data | |
1781 | * | |
1782 | * This is a generic xlate function that can be used to model simple PM domain | |
1783 | * controllers that have one device tree node and provide multiple PM domains. | |
1784 | * A single cell is used as an index into an array of PM domains specified in | |
1785 | * the genpd_onecell_data struct when registering the provider. | |
1786 | */ | |
1787 | struct generic_pm_domain *__of_genpd_xlate_onecell( | |
1788 | struct of_phandle_args *genpdspec, | |
1789 | void *data) | |
1790 | { | |
1791 | struct genpd_onecell_data *genpd_data = data; | |
1792 | unsigned int idx = genpdspec->args[0]; | |
1793 | ||
1794 | if (genpdspec->args_count != 1) | |
1795 | return ERR_PTR(-EINVAL); | |
1796 | ||
1797 | if (idx >= genpd_data->num_domains) { | |
1798 | pr_err("%s: invalid domain index %u\n", __func__, idx); | |
1799 | return ERR_PTR(-EINVAL); | |
1800 | } | |
1801 | ||
1802 | if (!genpd_data->domains[idx]) | |
1803 | return ERR_PTR(-ENOENT); | |
1804 | ||
1805 | return genpd_data->domains[idx]; | |
1806 | } | |
1807 | EXPORT_SYMBOL_GPL(__of_genpd_xlate_onecell); | |
1808 | ||
1809 | /** | |
1810 | * __of_genpd_add_provider() - Register a PM domain provider for a node | |
1811 | * @np: Device node pointer associated with the PM domain provider. | |
1812 | * @xlate: Callback for decoding PM domain from phandle arguments. | |
1813 | * @data: Context pointer for @xlate callback. | |
1814 | */ | |
1815 | int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, | |
1816 | void *data) | |
1817 | { | |
1818 | struct of_genpd_provider *cp; | |
1819 | ||
1820 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); | |
1821 | if (!cp) | |
1822 | return -ENOMEM; | |
1823 | ||
1824 | cp->node = of_node_get(np); | |
1825 | cp->data = data; | |
1826 | cp->xlate = xlate; | |
1827 | ||
1828 | mutex_lock(&of_genpd_mutex); | |
1829 | list_add(&cp->link, &of_genpd_providers); | |
1830 | mutex_unlock(&of_genpd_mutex); | |
1831 | pr_debug("Added domain provider from %s\n", np->full_name); | |
1832 | ||
1833 | return 0; | |
1834 | } | |
1835 | EXPORT_SYMBOL_GPL(__of_genpd_add_provider); | |
1836 | ||
1837 | /** | |
1838 | * of_genpd_del_provider() - Remove a previously registered PM domain provider | |
1839 | * @np: Device node pointer associated with the PM domain provider | |
1840 | */ | |
1841 | void of_genpd_del_provider(struct device_node *np) | |
1842 | { | |
1843 | struct of_genpd_provider *cp; | |
1844 | ||
1845 | mutex_lock(&of_genpd_mutex); | |
1846 | list_for_each_entry(cp, &of_genpd_providers, link) { | |
1847 | if (cp->node == np) { | |
1848 | list_del(&cp->link); | |
1849 | of_node_put(cp->node); | |
1850 | kfree(cp); | |
1851 | break; | |
1852 | } | |
1853 | } | |
1854 | mutex_unlock(&of_genpd_mutex); | |
1855 | } | |
1856 | EXPORT_SYMBOL_GPL(of_genpd_del_provider); | |
1857 | ||
1858 | /** | |
1859 | * of_genpd_get_from_provider() - Look-up PM domain | |
1860 | * @genpdspec: OF phandle args to use for look-up | |
1861 | * | |
1862 | * Looks for a PM domain provider under the node specified by @genpdspec and if | |
1863 | * found, uses xlate function of the provider to map phandle args to a PM | |
1864 | * domain. | |
1865 | * | |
1866 | * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() | |
1867 | * on failure. | |
1868 | */ | |
7496fcbe | 1869 | struct generic_pm_domain *of_genpd_get_from_provider( |
aa42240a TF |
1870 | struct of_phandle_args *genpdspec) |
1871 | { | |
1872 | struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); | |
1873 | struct of_genpd_provider *provider; | |
1874 | ||
1875 | mutex_lock(&of_genpd_mutex); | |
1876 | ||
1877 | /* Check if we have such a provider in our array */ | |
1878 | list_for_each_entry(provider, &of_genpd_providers, link) { | |
1879 | if (provider->node == genpdspec->np) | |
1880 | genpd = provider->xlate(genpdspec, provider->data); | |
1881 | if (!IS_ERR(genpd)) | |
1882 | break; | |
1883 | } | |
1884 | ||
1885 | mutex_unlock(&of_genpd_mutex); | |
1886 | ||
1887 | return genpd; | |
1888 | } | |
7496fcbe | 1889 | EXPORT_SYMBOL_GPL(of_genpd_get_from_provider); |
aa42240a TF |
1890 | |
1891 | /** | |
1892 | * genpd_dev_pm_detach - Detach a device from its PM domain. | |
8bb6944e | 1893 | * @dev: Device to detach. |
aa42240a TF |
1894 | * @power_off: Currently not used |
1895 | * | |
1896 | * Try to locate a corresponding generic PM domain, which the device was | |
1897 | * attached to previously. If such is found, the device is detached from it. | |
1898 | */ | |
1899 | static void genpd_dev_pm_detach(struct device *dev, bool power_off) | |
1900 | { | |
446d999c | 1901 | struct generic_pm_domain *pd; |
93af5e93 | 1902 | unsigned int i; |
aa42240a TF |
1903 | int ret = 0; |
1904 | ||
446d999c | 1905 | pd = pm_genpd_lookup_dev(dev); |
aa42240a TF |
1906 | if (!pd) |
1907 | return; | |
1908 | ||
1909 | dev_dbg(dev, "removing from PM domain %s\n", pd->name); | |
1910 | ||
93af5e93 | 1911 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
aa42240a TF |
1912 | ret = pm_genpd_remove_device(pd, dev); |
1913 | if (ret != -EAGAIN) | |
1914 | break; | |
93af5e93 GU |
1915 | |
1916 | mdelay(i); | |
aa42240a TF |
1917 | cond_resched(); |
1918 | } | |
1919 | ||
1920 | if (ret < 0) { | |
1921 | dev_err(dev, "failed to remove from PM domain %s: %d", | |
1922 | pd->name, ret); | |
1923 | return; | |
1924 | } | |
1925 | ||
1926 | /* Check if PM domain can be powered off after removing this device. */ | |
1927 | genpd_queue_power_off_work(pd); | |
1928 | } | |
1929 | ||
632f7ce3 RK |
1930 | static void genpd_dev_pm_sync(struct device *dev) |
1931 | { | |
1932 | struct generic_pm_domain *pd; | |
1933 | ||
1934 | pd = dev_to_genpd(dev); | |
1935 | if (IS_ERR(pd)) | |
1936 | return; | |
1937 | ||
1938 | genpd_queue_power_off_work(pd); | |
1939 | } | |
1940 | ||
aa42240a TF |
1941 | /** |
1942 | * genpd_dev_pm_attach - Attach a device to its PM domain using DT. | |
1943 | * @dev: Device to attach. | |
1944 | * | |
1945 | * Parse device's OF node to find a PM domain specifier. If such is found, | |
1946 | * attaches the device to retrieved pm_domain ops. | |
1947 | * | |
1948 | * Both generic and legacy Samsung-specific DT bindings are supported to keep | |
1949 | * backwards compatibility with existing DTBs. | |
1950 | * | |
311fa6ad JH |
1951 | * Returns 0 on successfully attached PM domain or negative error code. Note |
1952 | * that if a power-domain exists for the device, but it cannot be found or | |
1953 | * turned on, then return -EPROBE_DEFER to ensure that the device is not | |
1954 | * probed and to re-try again later. | |
aa42240a TF |
1955 | */ |
1956 | int genpd_dev_pm_attach(struct device *dev) | |
1957 | { | |
1958 | struct of_phandle_args pd_args; | |
1959 | struct generic_pm_domain *pd; | |
93af5e93 | 1960 | unsigned int i; |
aa42240a TF |
1961 | int ret; |
1962 | ||
1963 | if (!dev->of_node) | |
1964 | return -ENODEV; | |
1965 | ||
1966 | if (dev->pm_domain) | |
1967 | return -EEXIST; | |
1968 | ||
1969 | ret = of_parse_phandle_with_args(dev->of_node, "power-domains", | |
1970 | "#power-domain-cells", 0, &pd_args); | |
1971 | if (ret < 0) { | |
1972 | if (ret != -ENOENT) | |
1973 | return ret; | |
1974 | ||
1975 | /* | |
1976 | * Try legacy Samsung-specific bindings | |
1977 | * (for backwards compatibility of DT ABI) | |
1978 | */ | |
1979 | pd_args.args_count = 0; | |
1980 | pd_args.np = of_parse_phandle(dev->of_node, | |
1981 | "samsung,power-domain", 0); | |
1982 | if (!pd_args.np) | |
1983 | return -ENOENT; | |
1984 | } | |
1985 | ||
1986 | pd = of_genpd_get_from_provider(&pd_args); | |
1987 | if (IS_ERR(pd)) { | |
1988 | dev_dbg(dev, "%s() failed to find PM domain: %ld\n", | |
1989 | __func__, PTR_ERR(pd)); | |
1990 | of_node_put(dev->of_node); | |
311fa6ad | 1991 | return -EPROBE_DEFER; |
aa42240a TF |
1992 | } |
1993 | ||
1994 | dev_dbg(dev, "adding to PM domain %s\n", pd->name); | |
1995 | ||
93af5e93 | 1996 | for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { |
aa42240a TF |
1997 | ret = pm_genpd_add_device(pd, dev); |
1998 | if (ret != -EAGAIN) | |
1999 | break; | |
93af5e93 GU |
2000 | |
2001 | mdelay(i); | |
aa42240a TF |
2002 | cond_resched(); |
2003 | } | |
2004 | ||
2005 | if (ret < 0) { | |
2006 | dev_err(dev, "failed to add to PM domain %s: %d", | |
2007 | pd->name, ret); | |
2008 | of_node_put(dev->of_node); | |
311fa6ad | 2009 | goto out; |
aa42240a TF |
2010 | } |
2011 | ||
2012 | dev->pm_domain->detach = genpd_dev_pm_detach; | |
632f7ce3 | 2013 | dev->pm_domain->sync = genpd_dev_pm_sync; |
311fa6ad | 2014 | ret = pm_genpd_poweron(pd); |
aa42240a | 2015 | |
311fa6ad JH |
2016 | out: |
2017 | return ret ? -EPROBE_DEFER : 0; | |
aa42240a TF |
2018 | } |
2019 | EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); | |
d30d819d | 2020 | #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ |
2bd5306a MM |
2021 | |
2022 | ||
2023 | /*** debugfs support ***/ | |
2024 | ||
2025 | #ifdef CONFIG_PM_ADVANCED_DEBUG | |
2026 | #include <linux/pm.h> | |
2027 | #include <linux/device.h> | |
2028 | #include <linux/debugfs.h> | |
2029 | #include <linux/seq_file.h> | |
2030 | #include <linux/init.h> | |
2031 | #include <linux/kobject.h> | |
2032 | static struct dentry *pm_genpd_debugfs_dir; | |
2033 | ||
2034 | /* | |
2035 | * TODO: This function is a slightly modified version of rtpm_status_show | |
d30d819d | 2036 | * from sysfs.c, so generalize it. |
2bd5306a | 2037 | */ |
2bd5306a MM |
2038 | static void rtpm_status_str(struct seq_file *s, struct device *dev) |
2039 | { | |
2040 | static const char * const status_lookup[] = { | |
2041 | [RPM_ACTIVE] = "active", | |
2042 | [RPM_RESUMING] = "resuming", | |
2043 | [RPM_SUSPENDED] = "suspended", | |
2044 | [RPM_SUSPENDING] = "suspending" | |
2045 | }; | |
2046 | const char *p = ""; | |
2047 | ||
2048 | if (dev->power.runtime_error) | |
2049 | p = "error"; | |
2050 | else if (dev->power.disable_depth) | |
2051 | p = "unsupported"; | |
2052 | else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) | |
2053 | p = status_lookup[dev->power.runtime_status]; | |
2054 | else | |
2055 | WARN_ON(1); | |
2056 | ||
2057 | seq_puts(s, p); | |
2058 | } | |
2bd5306a MM |
2059 | |
2060 | static int pm_genpd_summary_one(struct seq_file *s, | |
66a5ca4b | 2061 | struct generic_pm_domain *genpd) |
2bd5306a MM |
2062 | { |
2063 | static const char * const status_lookup[] = { | |
2064 | [GPD_STATE_ACTIVE] = "on", | |
2bd5306a MM |
2065 | [GPD_STATE_POWER_OFF] = "off" |
2066 | }; | |
2067 | struct pm_domain_data *pm_data; | |
2068 | const char *kobj_path; | |
2069 | struct gpd_link *link; | |
2070 | int ret; | |
2071 | ||
66a5ca4b | 2072 | ret = mutex_lock_interruptible(&genpd->lock); |
2bd5306a MM |
2073 | if (ret) |
2074 | return -ERESTARTSYS; | |
2075 | ||
66a5ca4b | 2076 | if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) |
2bd5306a | 2077 | goto exit; |
15dec67a | 2078 | seq_printf(s, "%-30s %-15s ", genpd->name, status_lookup[genpd->status]); |
2bd5306a MM |
2079 | |
2080 | /* | |
2081 | * Modifications on the list require holding locks on both | |
2082 | * master and slave, so we are safe. | |
66a5ca4b | 2083 | * Also genpd->name is immutable. |
2bd5306a | 2084 | */ |
66a5ca4b | 2085 | list_for_each_entry(link, &genpd->master_links, master_node) { |
2bd5306a | 2086 | seq_printf(s, "%s", link->slave->name); |
66a5ca4b | 2087 | if (!list_is_last(&link->master_node, &genpd->master_links)) |
2bd5306a MM |
2088 | seq_puts(s, ", "); |
2089 | } | |
2090 | ||
66a5ca4b | 2091 | list_for_each_entry(pm_data, &genpd->dev_list, list_node) { |
2bd5306a MM |
2092 | kobj_path = kobject_get_path(&pm_data->dev->kobj, GFP_KERNEL); |
2093 | if (kobj_path == NULL) | |
2094 | continue; | |
2095 | ||
2096 | seq_printf(s, "\n %-50s ", kobj_path); | |
2097 | rtpm_status_str(s, pm_data->dev); | |
2098 | kfree(kobj_path); | |
2099 | } | |
2100 | ||
2101 | seq_puts(s, "\n"); | |
2102 | exit: | |
66a5ca4b | 2103 | mutex_unlock(&genpd->lock); |
2bd5306a MM |
2104 | |
2105 | return 0; | |
2106 | } | |
2107 | ||
2108 | static int pm_genpd_summary_show(struct seq_file *s, void *data) | |
2109 | { | |
66a5ca4b | 2110 | struct generic_pm_domain *genpd; |
2bd5306a MM |
2111 | int ret = 0; |
2112 | ||
15dec67a GU |
2113 | seq_puts(s, "domain status slaves\n"); |
2114 | seq_puts(s, " /device runtime status\n"); | |
2bd5306a MM |
2115 | seq_puts(s, "----------------------------------------------------------------------\n"); |
2116 | ||
2117 | ret = mutex_lock_interruptible(&gpd_list_lock); | |
2118 | if (ret) | |
2119 | return -ERESTARTSYS; | |
2120 | ||
66a5ca4b KH |
2121 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) { |
2122 | ret = pm_genpd_summary_one(s, genpd); | |
2bd5306a MM |
2123 | if (ret) |
2124 | break; | |
2125 | } | |
2126 | mutex_unlock(&gpd_list_lock); | |
2127 | ||
2128 | return ret; | |
2129 | } | |
2130 | ||
2131 | static int pm_genpd_summary_open(struct inode *inode, struct file *file) | |
2132 | { | |
2133 | return single_open(file, pm_genpd_summary_show, NULL); | |
2134 | } | |
2135 | ||
2136 | static const struct file_operations pm_genpd_summary_fops = { | |
2137 | .open = pm_genpd_summary_open, | |
2138 | .read = seq_read, | |
2139 | .llseek = seq_lseek, | |
2140 | .release = single_release, | |
2141 | }; | |
2142 | ||
2143 | static int __init pm_genpd_debug_init(void) | |
2144 | { | |
2145 | struct dentry *d; | |
2146 | ||
2147 | pm_genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); | |
2148 | ||
2149 | if (!pm_genpd_debugfs_dir) | |
2150 | return -ENOMEM; | |
2151 | ||
2152 | d = debugfs_create_file("pm_genpd_summary", S_IRUGO, | |
2153 | pm_genpd_debugfs_dir, NULL, &pm_genpd_summary_fops); | |
2154 | if (!d) | |
2155 | return -ENOMEM; | |
2156 | ||
2157 | return 0; | |
2158 | } | |
2159 | late_initcall(pm_genpd_debug_init); | |
2160 | ||
2161 | static void __exit pm_genpd_debug_exit(void) | |
2162 | { | |
2163 | debugfs_remove_recursive(pm_genpd_debugfs_dir); | |
2164 | } | |
2165 | __exitcall(pm_genpd_debug_exit); | |
2166 | #endif /* CONFIG_PM_ADVANCED_DEBUG */ |