Branch data Line data Source code
1 : : /*
2 : : * This module exposes the interface to kernel space for specifying
3 : : * QoS dependencies. It provides infrastructure for registration of:
4 : : *
5 : : * Dependents on a QoS value : register requests
6 : : * Watchers of QoS value : get notified when target QoS value changes
7 : : *
8 : : * This QoS design is best effort based. Dependents register their QoS needs.
9 : : * Watchers register to keep track of the current QoS needs of the system.
10 : : *
11 : : * There are 3 basic classes of QoS parameter: latency, timeout, throughput
12 : : * each have defined units:
13 : : * latency: usec
14 : : * timeout: usec <-- currently not used.
15 : : * throughput: kbs (kilo byte / sec)
16 : : *
17 : : * There are lists of pm_qos_objects each one wrapping requests, notifiers
18 : : *
19 : : * User mode requests on a QOS parameter register themselves to the
20 : : * subsystem by opening the device node /dev/... and writing there request to
21 : : * the node. As long as the process holds a file handle open to the node the
22 : : * client continues to be accounted for. Upon file release the usermode
23 : : * request is removed and a new qos target is computed. This way when the
24 : : * request that the application has is cleaned up when closes the file
25 : : * pointer or exits the pm_qos_object will get an opportunity to clean up.
26 : : *
27 : : * Mark Gross <mgross@linux.intel.com>
28 : : */
29 : :
30 : : /*#define DEBUG*/
31 : :
32 : : #include <linux/pm_qos.h>
33 : : #include <linux/sched.h>
34 : : #include <linux/spinlock.h>
35 : : #include <linux/slab.h>
36 : : #include <linux/time.h>
37 : : #include <linux/fs.h>
38 : : #include <linux/device.h>
39 : : #include <linux/miscdevice.h>
40 : : #include <linux/string.h>
41 : : #include <linux/platform_device.h>
42 : : #include <linux/init.h>
43 : : #include <linux/kernel.h>
44 : :
45 : : #include <linux/uaccess.h>
46 : : #include <linux/export.h>
47 : : #include <trace/events/power.h>
48 : :
49 : : /*
50 : : * locking rule: all changes to constraints or notifiers lists
51 : : * or pm_qos_object list and pm_qos_objects need to happen with pm_qos_lock
52 : : * held, taken with _irqsave. One lock to rule them all
53 : : */
54 : : struct pm_qos_object {
55 : : struct pm_qos_constraints *constraints;
56 : : struct miscdevice pm_qos_power_miscdev;
57 : : char *name;
58 : : };
59 : :
60 : : static DEFINE_SPINLOCK(pm_qos_lock);
61 : :
62 : : static struct pm_qos_object null_pm_qos;
63 : :
64 : : static BLOCKING_NOTIFIER_HEAD(cpu_dma_lat_notifier);
65 : : static struct pm_qos_constraints cpu_dma_constraints = {
66 : : .list = PLIST_HEAD_INIT(cpu_dma_constraints.list),
67 : : .target_value = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE,
68 : : .default_value = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE,
69 : : .type = PM_QOS_MIN,
70 : : .notifiers = &cpu_dma_lat_notifier,
71 : : };
72 : : static struct pm_qos_object cpu_dma_pm_qos = {
73 : : .constraints = &cpu_dma_constraints,
74 : : .name = "cpu_dma_latency",
75 : : };
76 : :
77 : : static BLOCKING_NOTIFIER_HEAD(network_lat_notifier);
78 : : static struct pm_qos_constraints network_lat_constraints = {
79 : : .list = PLIST_HEAD_INIT(network_lat_constraints.list),
80 : : .target_value = PM_QOS_NETWORK_LAT_DEFAULT_VALUE,
81 : : .default_value = PM_QOS_NETWORK_LAT_DEFAULT_VALUE,
82 : : .type = PM_QOS_MIN,
83 : : .notifiers = &network_lat_notifier,
84 : : };
85 : : static struct pm_qos_object network_lat_pm_qos = {
86 : : .constraints = &network_lat_constraints,
87 : : .name = "network_latency",
88 : : };
89 : :
90 : :
91 : : static BLOCKING_NOTIFIER_HEAD(network_throughput_notifier);
92 : : static struct pm_qos_constraints network_tput_constraints = {
93 : : .list = PLIST_HEAD_INIT(network_tput_constraints.list),
94 : : .target_value = PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE,
95 : : .default_value = PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE,
96 : : .type = PM_QOS_MAX,
97 : : .notifiers = &network_throughput_notifier,
98 : : };
99 : : static struct pm_qos_object network_throughput_pm_qos = {
100 : : .constraints = &network_tput_constraints,
101 : : .name = "network_throughput",
102 : : };
103 : :
104 : :
105 : : static struct pm_qos_object *pm_qos_array[] = {
106 : : &null_pm_qos,
107 : : &cpu_dma_pm_qos,
108 : : &network_lat_pm_qos,
109 : : &network_throughput_pm_qos
110 : : };
111 : :
112 : : static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
113 : : size_t count, loff_t *f_pos);
114 : : static ssize_t pm_qos_power_read(struct file *filp, char __user *buf,
115 : : size_t count, loff_t *f_pos);
116 : : static int pm_qos_power_open(struct inode *inode, struct file *filp);
117 : : static int pm_qos_power_release(struct inode *inode, struct file *filp);
118 : :
119 : : static const struct file_operations pm_qos_power_fops = {
120 : : .write = pm_qos_power_write,
121 : : .read = pm_qos_power_read,
122 : : .open = pm_qos_power_open,
123 : : .release = pm_qos_power_release,
124 : : .llseek = noop_llseek,
125 : : };
126 : :
127 : : /* unlocked internal variant */
128 : : static inline int pm_qos_get_value(struct pm_qos_constraints *c)
129 : : {
130 [ # # # # ]: 0 : if (plist_head_empty(&c->list))
[ # # ]
131 : 0 : return c->default_value;
132 : :
133 [ # # # ]: 0 : switch (c->type) {
[ # # # ]
[ # # # ]
134 : : case PM_QOS_MIN:
135 : 0 : return plist_first(&c->list)->prio;
136 : :
137 : : case PM_QOS_MAX:
138 : 0 : return plist_last(&c->list)->prio;
139 : :
140 : : default:
141 : : /* runtime check for not using enum */
142 : 0 : BUG();
143 : : return PM_QOS_DEFAULT_VALUE;
144 : : }
145 : : }
146 : :
147 : 0 : s32 pm_qos_read_value(struct pm_qos_constraints *c)
148 : : {
149 : 8108428 : return c->target_value;
150 : : }
151 : :
152 : : static inline void pm_qos_set_value(struct pm_qos_constraints *c, s32 value)
153 : : {
154 : 0 : c->target_value = value;
155 : : }
156 : :
157 : : /**
158 : : * pm_qos_update_target - manages the constraints list and calls the notifiers
159 : : * if needed
160 : : * @c: constraints data struct
161 : : * @node: request to add to the list, to update or to remove
162 : : * @action: action to take on the constraints list
163 : : * @value: value of the request to add or update
164 : : *
165 : : * This function returns 1 if the aggregated constraint value has changed, 0
166 : : * otherwise.
167 : : */
168 : 0 : int pm_qos_update_target(struct pm_qos_constraints *c, struct plist_node *node,
169 : : enum pm_qos_req_action action, int value)
170 : : {
171 : : unsigned long flags;
172 : : int prev_value, curr_value, new_value;
173 : :
174 : 0 : spin_lock_irqsave(&pm_qos_lock, flags);
175 : : prev_value = pm_qos_get_value(c);
176 [ # # ]: 0 : if (value == PM_QOS_DEFAULT_VALUE)
177 : 0 : new_value = c->default_value;
178 : : else
179 : : new_value = value;
180 : :
181 [ # # # # ]: 0 : switch (action) {
182 : : case PM_QOS_REMOVE_REQ:
183 : 0 : plist_del(node, &c->list);
184 : 0 : break;
185 : : case PM_QOS_UPDATE_REQ:
186 : : /*
187 : : * to change the list, we atomically remove, reinit
188 : : * with new value and add, then see if the extremal
189 : : * changed
190 : : */
191 : 0 : plist_del(node, &c->list);
192 : : case PM_QOS_ADD_REQ:
193 : : plist_node_init(node, new_value);
194 : 0 : plist_add(node, &c->list);
195 : 0 : break;
196 : : default:
197 : : /* no action */
198 : : ;
199 : : }
200 : :
201 : : curr_value = pm_qos_get_value(c);
202 : : pm_qos_set_value(c, curr_value);
203 : :
204 : : spin_unlock_irqrestore(&pm_qos_lock, flags);
205 : :
206 : : trace_pm_qos_update_target(action, prev_value, curr_value);
207 [ # # ]: 0 : if (prev_value != curr_value) {
208 : 0 : blocking_notifier_call_chain(c->notifiers,
209 : : (unsigned long)curr_value,
210 : : NULL);
211 : 0 : return 1;
212 : : } else {
213 : : return 0;
214 : : }
215 : : }
216 : :
217 : : /**
218 : : * pm_qos_flags_remove_req - Remove device PM QoS flags request.
219 : : * @pqf: Device PM QoS flags set to remove the request from.
220 : : * @req: Request to remove from the set.
221 : : */
222 : : static void pm_qos_flags_remove_req(struct pm_qos_flags *pqf,
223 : : struct pm_qos_flags_request *req)
224 : : {
225 : : s32 val = 0;
226 : :
227 : : list_del(&req->node);
228 [ # # ][ # # ]: 0 : list_for_each_entry(req, &pqf->list, node)
229 : 0 : val |= req->flags;
230 : :
231 : 0 : pqf->effective_flags = val;
232 : : }
233 : :
234 : : /**
235 : : * pm_qos_update_flags - Update a set of PM QoS flags.
236 : : * @pqf: Set of flags to update.
237 : : * @req: Request to add to the set, to modify, or to remove from the set.
238 : : * @action: Action to take on the set.
239 : : * @val: Value of the request to add or modify.
240 : : *
241 : : * Update the given set of PM QoS flags and call notifiers if the aggregate
242 : : * value has changed. Returns 1 if the aggregate constraint value has changed,
243 : : * 0 otherwise.
244 : : */
245 : 0 : bool pm_qos_update_flags(struct pm_qos_flags *pqf,
246 : : struct pm_qos_flags_request *req,
247 : : enum pm_qos_req_action action, s32 val)
248 : : {
249 : : unsigned long irqflags;
250 : : s32 prev_value, curr_value;
251 : :
252 : 0 : spin_lock_irqsave(&pm_qos_lock, irqflags);
253 : :
254 [ # # ]: 0 : prev_value = list_empty(&pqf->list) ? 0 : pqf->effective_flags;
255 : :
256 [ # # # # ]: 0 : switch (action) {
257 : : case PM_QOS_REMOVE_REQ:
258 : : pm_qos_flags_remove_req(pqf, req);
259 : : break;
260 : : case PM_QOS_UPDATE_REQ:
261 : : pm_qos_flags_remove_req(pqf, req);
262 : : case PM_QOS_ADD_REQ:
263 : 0 : req->flags = val;
264 : 0 : INIT_LIST_HEAD(&req->node);
265 : : list_add_tail(&req->node, &pqf->list);
266 : 0 : pqf->effective_flags |= val;
267 : 0 : break;
268 : : default:
269 : : /* no action */
270 : : ;
271 : : }
272 : :
273 [ # # ]: 0 : curr_value = list_empty(&pqf->list) ? 0 : pqf->effective_flags;
274 : :
275 : : spin_unlock_irqrestore(&pm_qos_lock, irqflags);
276 : :
277 : : trace_pm_qos_update_flags(action, prev_value, curr_value);
278 : 0 : return prev_value != curr_value;
279 : : }
280 : :
281 : : /**
282 : : * pm_qos_request - returns current system wide qos expectation
283 : : * @pm_qos_class: identification of which qos value is requested
284 : : *
285 : : * This function returns the current target value.
286 : : */
287 : 0 : int pm_qos_request(int pm_qos_class)
288 : : {
289 : 16216856 : return pm_qos_read_value(pm_qos_array[pm_qos_class]->constraints);
290 : : }
291 : : EXPORT_SYMBOL_GPL(pm_qos_request);
292 : :
293 : 0 : int pm_qos_request_active(struct pm_qos_request *req)
294 : : {
295 : 0 : return req->pm_qos_class != 0;
296 : : }
297 : : EXPORT_SYMBOL_GPL(pm_qos_request_active);
298 : :
299 : 0 : static void __pm_qos_update_request(struct pm_qos_request *req,
300 : : s32 new_value)
301 : : {
302 : 0 : trace_pm_qos_update_request(req->pm_qos_class, new_value);
303 : :
304 [ # # ]: 0 : if (new_value != req->node.prio)
305 : 0 : pm_qos_update_target(
306 : 0 : pm_qos_array[req->pm_qos_class]->constraints,
307 : : &req->node, PM_QOS_UPDATE_REQ, new_value);
308 : 0 : }
309 : :
310 : : /**
311 : : * pm_qos_work_fn - the timeout handler of pm_qos_update_request_timeout
312 : : * @work: work struct for the delayed work (timeout)
313 : : *
314 : : * This cancels the timeout request by falling back to the default at timeout.
315 : : */
316 : 0 : static void pm_qos_work_fn(struct work_struct *work)
317 : : {
318 : 0 : struct pm_qos_request *req = container_of(to_delayed_work(work),
319 : : struct pm_qos_request,
320 : : work);
321 : :
322 : 0 : __pm_qos_update_request(req, PM_QOS_DEFAULT_VALUE);
323 : 0 : }
324 : :
325 : : /**
326 : : * pm_qos_add_request - inserts new qos request into the list
327 : : * @req: pointer to a preallocated handle
328 : : * @pm_qos_class: identifies which list of qos request to use
329 : : * @value: defines the qos request
330 : : *
331 : : * This function inserts a new entry in the pm_qos_class list of requested qos
332 : : * performance characteristics. It recomputes the aggregate QoS expectations
333 : : * for the pm_qos_class of parameters and initializes the pm_qos_request
334 : : * handle. Caller needs to save this handle for later use in updates and
335 : : * removal.
336 : : */
337 : :
338 : 0 : void pm_qos_add_request(struct pm_qos_request *req,
339 : : int pm_qos_class, s32 value)
340 : : {
341 [ # # ]: 0 : if (!req) /*guard against callers passing in null */
342 : : return;
343 : :
344 [ # # ]: 0 : if (pm_qos_request_active(req)) {
345 : 0 : WARN(1, KERN_ERR "pm_qos_add_request() called for already added request\n");
346 : 0 : return;
347 : : }
348 : 0 : req->pm_qos_class = pm_qos_class;
349 : 0 : INIT_DELAYED_WORK(&req->work, pm_qos_work_fn);
350 : : trace_pm_qos_add_request(pm_qos_class, value);
351 : 0 : pm_qos_update_target(pm_qos_array[pm_qos_class]->constraints,
352 : : &req->node, PM_QOS_ADD_REQ, value);
353 : : }
354 : : EXPORT_SYMBOL_GPL(pm_qos_add_request);
355 : :
356 : : /**
357 : : * pm_qos_update_request - modifies an existing qos request
358 : : * @req : handle to list element holding a pm_qos request to use
359 : : * @value: defines the qos request
360 : : *
361 : : * Updates an existing qos request for the pm_qos_class of parameters along
362 : : * with updating the target pm_qos_class value.
363 : : *
364 : : * Attempts are made to make this code callable on hot code paths.
365 : : */
366 : 0 : void pm_qos_update_request(struct pm_qos_request *req,
367 : : s32 new_value)
368 : : {
369 [ # # ]: 0 : if (!req) /*guard against callers passing in null */
370 : : return;
371 : :
372 [ # # ]: 0 : if (!pm_qos_request_active(req)) {
373 : 0 : WARN(1, KERN_ERR "pm_qos_update_request() called for unknown object\n");
374 : 0 : return;
375 : : }
376 : :
377 : 0 : cancel_delayed_work_sync(&req->work);
378 : 0 : __pm_qos_update_request(req, new_value);
379 : : }
380 : : EXPORT_SYMBOL_GPL(pm_qos_update_request);
381 : :
382 : : /**
383 : : * pm_qos_update_request_timeout - modifies an existing qos request temporarily.
384 : : * @req : handle to list element holding a pm_qos request to use
385 : : * @new_value: defines the temporal qos request
386 : : * @timeout_us: the effective duration of this qos request in usecs.
387 : : *
388 : : * After timeout_us, this qos request is cancelled automatically.
389 : : */
390 : 0 : void pm_qos_update_request_timeout(struct pm_qos_request *req, s32 new_value,
391 : : unsigned long timeout_us)
392 : : {
393 [ # # ]: 0 : if (!req)
394 : : return;
395 [ # # ][ # # ]: 0 : if (WARN(!pm_qos_request_active(req),
396 : : "%s called for unknown object.", __func__))
397 : : return;
398 : :
399 : 0 : cancel_delayed_work_sync(&req->work);
400 : :
401 : 0 : trace_pm_qos_update_request_timeout(req->pm_qos_class,
402 : : new_value, timeout_us);
403 [ # # ]: 0 : if (new_value != req->node.prio)
404 : 0 : pm_qos_update_target(
405 : 0 : pm_qos_array[req->pm_qos_class]->constraints,
406 : : &req->node, PM_QOS_UPDATE_REQ, new_value);
407 : :
408 : 0 : schedule_delayed_work(&req->work, usecs_to_jiffies(timeout_us));
409 : : }
410 : :
411 : : /**
412 : : * pm_qos_remove_request - modifies an existing qos request
413 : : * @req: handle to request list element
414 : : *
415 : : * Will remove pm qos request from the list of constraints and
416 : : * recompute the current target value for the pm_qos_class. Call this
417 : : * on slow code paths.
418 : : */
419 : 0 : void pm_qos_remove_request(struct pm_qos_request *req)
420 : : {
421 [ # # ]: 0 : if (!req) /*guard against callers passing in null */
422 : : return;
423 : : /* silent return to keep pcm code cleaner */
424 : :
425 [ # # ]: 0 : if (!pm_qos_request_active(req)) {
426 : 0 : WARN(1, KERN_ERR "pm_qos_remove_request() called for unknown object\n");
427 : 0 : return;
428 : : }
429 : :
430 : 0 : cancel_delayed_work_sync(&req->work);
431 : :
432 : 0 : trace_pm_qos_remove_request(req->pm_qos_class, PM_QOS_DEFAULT_VALUE);
433 : 0 : pm_qos_update_target(pm_qos_array[req->pm_qos_class]->constraints,
434 : : &req->node, PM_QOS_REMOVE_REQ,
435 : : PM_QOS_DEFAULT_VALUE);
436 : 0 : memset(req, 0, sizeof(*req));
437 : : }
438 : : EXPORT_SYMBOL_GPL(pm_qos_remove_request);
439 : :
440 : : /**
441 : : * pm_qos_add_notifier - sets notification entry for changes to target value
442 : : * @pm_qos_class: identifies which qos target changes should be notified.
443 : : * @notifier: notifier block managed by caller.
444 : : *
445 : : * will register the notifier into a notification chain that gets called
446 : : * upon changes to the pm_qos_class target value.
447 : : */
448 : 0 : int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier)
449 : : {
450 : : int retval;
451 : :
452 : 0 : retval = blocking_notifier_chain_register(
453 : 0 : pm_qos_array[pm_qos_class]->constraints->notifiers,
454 : : notifier);
455 : :
456 : 0 : return retval;
457 : : }
458 : : EXPORT_SYMBOL_GPL(pm_qos_add_notifier);
459 : :
460 : : /**
461 : : * pm_qos_remove_notifier - deletes notification entry from chain.
462 : : * @pm_qos_class: identifies which qos target changes are notified.
463 : : * @notifier: notifier block to be removed.
464 : : *
465 : : * will remove the notifier from the notification chain that gets called
466 : : * upon changes to the pm_qos_class target value.
467 : : */
468 : 0 : int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier)
469 : : {
470 : : int retval;
471 : :
472 : 0 : retval = blocking_notifier_chain_unregister(
473 : 0 : pm_qos_array[pm_qos_class]->constraints->notifiers,
474 : : notifier);
475 : :
476 : 0 : return retval;
477 : : }
478 : : EXPORT_SYMBOL_GPL(pm_qos_remove_notifier);
479 : :
480 : : /* User space interface to PM QoS classes via misc devices */
481 : : static int register_pm_qos_misc(struct pm_qos_object *qos)
482 : : {
483 : 0 : qos->pm_qos_power_miscdev.minor = MISC_DYNAMIC_MINOR;
484 : 0 : qos->pm_qos_power_miscdev.name = qos->name;
485 : 0 : qos->pm_qos_power_miscdev.fops = &pm_qos_power_fops;
486 : :
487 : 0 : return misc_register(&qos->pm_qos_power_miscdev);
488 : : }
489 : :
490 : : static int find_pm_qos_object_by_minor(int minor)
491 : : {
492 : : int pm_qos_class;
493 : :
494 [ # # ]: 0 : for (pm_qos_class = PM_QOS_CPU_DMA_LATENCY;
495 : 0 : pm_qos_class < PM_QOS_NUM_CLASSES; pm_qos_class++) {
496 [ # # ]: 0 : if (minor ==
497 : 0 : pm_qos_array[pm_qos_class]->pm_qos_power_miscdev.minor)
498 : : return pm_qos_class;
499 : : }
500 : : return -1;
501 : : }
502 : :
503 : 0 : static int pm_qos_power_open(struct inode *inode, struct file *filp)
504 : : {
505 : : long pm_qos_class;
506 : :
507 : 0 : pm_qos_class = find_pm_qos_object_by_minor(iminor(inode));
508 [ # # ]: 0 : if (pm_qos_class >= PM_QOS_CPU_DMA_LATENCY) {
509 : : struct pm_qos_request *req = kzalloc(sizeof(*req), GFP_KERNEL);
510 [ # # ]: 0 : if (!req)
511 : : return -ENOMEM;
512 : :
513 : 0 : pm_qos_add_request(req, pm_qos_class, PM_QOS_DEFAULT_VALUE);
514 : 0 : filp->private_data = req;
515 : :
516 : 0 : return 0;
517 : : }
518 : : return -EPERM;
519 : : }
520 : :
521 : 0 : static int pm_qos_power_release(struct inode *inode, struct file *filp)
522 : : {
523 : : struct pm_qos_request *req;
524 : :
525 : 0 : req = filp->private_data;
526 : 0 : pm_qos_remove_request(req);
527 : 0 : kfree(req);
528 : :
529 : 0 : return 0;
530 : : }
531 : :
532 : :
533 : 0 : static ssize_t pm_qos_power_read(struct file *filp, char __user *buf,
534 : : size_t count, loff_t *f_pos)
535 : : {
536 : : s32 value;
537 : : unsigned long flags;
538 : 0 : struct pm_qos_request *req = filp->private_data;
539 : :
540 [ # # ]: 0 : if (!req)
541 : : return -EINVAL;
542 [ # # ]: 0 : if (!pm_qos_request_active(req))
543 : : return -EINVAL;
544 : :
545 : 0 : spin_lock_irqsave(&pm_qos_lock, flags);
546 : 0 : value = pm_qos_get_value(pm_qos_array[req->pm_qos_class]->constraints);
547 : : spin_unlock_irqrestore(&pm_qos_lock, flags);
548 : :
549 : 0 : return simple_read_from_buffer(buf, count, f_pos, &value, sizeof(s32));
550 : : }
551 : :
552 : 0 : static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
553 : : size_t count, loff_t *f_pos)
554 : : {
555 : : s32 value;
556 : : struct pm_qos_request *req;
557 : :
558 [ # # ]: 0 : if (count == sizeof(s32)) {
559 [ # # ]: 0 : if (copy_from_user(&value, buf, sizeof(s32)))
560 : : return -EFAULT;
561 : : } else {
562 : : int ret;
563 : :
564 : : ret = kstrtos32_from_user(buf, count, 16, &value);
565 [ # # ]: 0 : if (ret)
566 : : return ret;
567 : : }
568 : :
569 : 0 : req = filp->private_data;
570 : 0 : pm_qos_update_request(req, value);
571 : :
572 : 0 : return count;
573 : : }
574 : :
575 : :
576 : 0 : static int __init pm_qos_power_init(void)
577 : : {
578 : : int ret = 0;
579 : : int i;
580 : :
581 : : BUILD_BUG_ON(ARRAY_SIZE(pm_qos_array) != PM_QOS_NUM_CLASSES);
582 : :
583 [ # # ]: 0 : for (i = PM_QOS_CPU_DMA_LATENCY; i < PM_QOS_NUM_CLASSES; i++) {
584 : 0 : ret = register_pm_qos_misc(pm_qos_array[i]);
585 [ # # ]: 0 : if (ret < 0) {
586 : 0 : printk(KERN_ERR "pm_qos_param: %s setup failed\n",
587 : 0 : pm_qos_array[i]->name);
588 : 0 : return ret;
589 : : }
590 : : }
591 : :
592 : : return ret;
593 : : }
594 : :
595 : : late_initcall(pm_qos_power_init);
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