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19#include <linux/module.h>
20#include <linux/device.h>
21#include <linux/err.h>
22#include <linux/slab.h>
23#include <linux/powercap.h>
24
25#define to_powercap_zone(n) container_of(n, struct powercap_zone, dev)
26#define to_powercap_control_type(n) \
27 container_of(n, struct powercap_control_type, dev)
28
29
30#define define_power_zone_show(_attr) \
31static ssize_t _attr##_show(struct device *dev, \
32 struct device_attribute *dev_attr,\
33 char *buf) \
34{ \
35 u64 value; \
36 ssize_t len = -EINVAL; \
37 struct powercap_zone *power_zone = to_powercap_zone(dev); \
38 \
39 if (power_zone->ops->get_##_attr) { \
40 if (!power_zone->ops->get_##_attr(power_zone, &value)) \
41 len = sprintf(buf, "%lld\n", value); \
42 } \
43 \
44 return len; \
45}
46
47
48#define define_power_zone_store(_attr) \
49static ssize_t _attr##_store(struct device *dev,\
50 struct device_attribute *dev_attr, \
51 const char *buf, size_t count) \
52{ \
53 int err; \
54 struct powercap_zone *power_zone = to_powercap_zone(dev); \
55 u64 value; \
56 \
57 err = kstrtoull(buf, 10, &value); \
58 if (err) \
59 return -EINVAL; \
60 if (value) \
61 return count; \
62 if (power_zone->ops->reset_##_attr) { \
63 if (!power_zone->ops->reset_##_attr(power_zone)) \
64 return count; \
65 } \
66 \
67 return -EINVAL; \
68}
69
70
71#define define_power_zone_constraint_show(_attr) \
72static ssize_t show_constraint_##_attr(struct device *dev, \
73 struct device_attribute *dev_attr,\
74 char *buf) \
75{ \
76 u64 value; \
77 ssize_t len = -ENODATA; \
78 struct powercap_zone *power_zone = to_powercap_zone(dev); \
79 int id; \
80 struct powercap_zone_constraint *pconst;\
81 \
82 if (!sscanf(dev_attr->attr.name, "constraint_%d_", &id)) \
83 return -EINVAL; \
84 if (id >= power_zone->const_id_cnt) \
85 return -EINVAL; \
86 pconst = &power_zone->constraints[id]; \
87 if (pconst && pconst->ops && pconst->ops->get_##_attr) { \
88 if (!pconst->ops->get_##_attr(power_zone, id, &value)) \
89 len = sprintf(buf, "%lld\n", value); \
90 } \
91 \
92 return len; \
93}
94
95
96#define define_power_zone_constraint_store(_attr) \
97static ssize_t store_constraint_##_attr(struct device *dev,\
98 struct device_attribute *dev_attr, \
99 const char *buf, size_t count) \
100{ \
101 int err; \
102 u64 value; \
103 struct powercap_zone *power_zone = to_powercap_zone(dev); \
104 int id; \
105 struct powercap_zone_constraint *pconst;\
106 \
107 if (!sscanf(dev_attr->attr.name, "constraint_%d_", &id)) \
108 return -EINVAL; \
109 if (id >= power_zone->const_id_cnt) \
110 return -EINVAL; \
111 pconst = &power_zone->constraints[id]; \
112 err = kstrtoull(buf, 10, &value); \
113 if (err) \
114 return -EINVAL; \
115 if (pconst && pconst->ops && pconst->ops->set_##_attr) { \
116 if (!pconst->ops->set_##_attr(power_zone, id, value)) \
117 return count; \
118 } \
119 \
120 return -ENODATA; \
121}
122
123
124define_power_zone_show(power_uw);
125define_power_zone_show(max_power_range_uw);
126define_power_zone_show(energy_uj);
127define_power_zone_store(energy_uj);
128define_power_zone_show(max_energy_range_uj);
129
130
131static DEVICE_ATTR_RO(max_power_range_uw);
132static DEVICE_ATTR_RO(power_uw);
133static DEVICE_ATTR_RO(max_energy_range_uj);
134static DEVICE_ATTR_RW(energy_uj);
135
136
137define_power_zone_constraint_show(power_limit_uw);
138define_power_zone_constraint_store(power_limit_uw);
139define_power_zone_constraint_show(time_window_us);
140define_power_zone_constraint_store(time_window_us);
141define_power_zone_constraint_show(max_power_uw);
142define_power_zone_constraint_show(min_power_uw);
143define_power_zone_constraint_show(max_time_window_us);
144define_power_zone_constraint_show(min_time_window_us);
145
146
147struct powercap_constraint_attr {
148 struct device_attribute power_limit_attr;
149 struct device_attribute time_window_attr;
150 struct device_attribute max_power_attr;
151 struct device_attribute min_power_attr;
152 struct device_attribute max_time_window_attr;
153 struct device_attribute min_time_window_attr;
154 struct device_attribute name_attr;
155};
156
157static struct powercap_constraint_attr
158 constraint_attrs[MAX_CONSTRAINTS_PER_ZONE];
159
160
161static LIST_HEAD(powercap_cntrl_list);
162
163static DEFINE_MUTEX(powercap_cntrl_list_lock);
164
165#define POWERCAP_CONSTRAINT_NAME_LEN 30
166static ssize_t show_constraint_name(struct device *dev,
167 struct device_attribute *dev_attr,
168 char *buf)
169{
170 const char *name;
171 struct powercap_zone *power_zone = to_powercap_zone(dev);
172 int id;
173 ssize_t len = -ENODATA;
174 struct powercap_zone_constraint *pconst;
175
176 if (!sscanf(dev_attr->attr.name, "constraint_%d_", &id))
177 return -EINVAL;
178 if (id >= power_zone->const_id_cnt)
179 return -EINVAL;
180 pconst = &power_zone->constraints[id];
181
182 if (pconst && pconst->ops && pconst->ops->get_name) {
183 name = pconst->ops->get_name(power_zone, id);
184 if (name) {
185 snprintf(buf, POWERCAP_CONSTRAINT_NAME_LEN,
186 "%s\n", name);
187 buf[POWERCAP_CONSTRAINT_NAME_LEN] = '\0';
188 len = strlen(buf);
189 }
190 }
191
192 return len;
193}
194
195static int create_constraint_attribute(int id, const char *name,
196 int mode,
197 struct device_attribute *dev_attr,
198 ssize_t (*show)(struct device *,
199 struct device_attribute *, char *),
200 ssize_t (*store)(struct device *,
201 struct device_attribute *,
202 const char *, size_t)
203 )
204{
205
206 dev_attr->attr.name = kasprintf(GFP_KERNEL, "constraint_%d_%s",
207 id, name);
208 if (!dev_attr->attr.name)
209 return -ENOMEM;
210 dev_attr->attr.mode = mode;
211 dev_attr->show = show;
212 dev_attr->store = store;
213
214 return 0;
215}
216
217static void free_constraint_attributes(void)
218{
219 int i;
220
221 for (i = 0; i < MAX_CONSTRAINTS_PER_ZONE; ++i) {
222 kfree(constraint_attrs[i].power_limit_attr.attr.name);
223 kfree(constraint_attrs[i].time_window_attr.attr.name);
224 kfree(constraint_attrs[i].name_attr.attr.name);
225 kfree(constraint_attrs[i].max_power_attr.attr.name);
226 kfree(constraint_attrs[i].min_power_attr.attr.name);
227 kfree(constraint_attrs[i].max_time_window_attr.attr.name);
228 kfree(constraint_attrs[i].min_time_window_attr.attr.name);
229 }
230}
231
232static int seed_constraint_attributes(void)
233{
234 int i;
235 int ret;
236
237 for (i = 0; i < MAX_CONSTRAINTS_PER_ZONE; ++i) {
238 ret = create_constraint_attribute(i, "power_limit_uw",
239 S_IWUSR | S_IRUGO,
240 &constraint_attrs[i].power_limit_attr,
241 show_constraint_power_limit_uw,
242 store_constraint_power_limit_uw);
243 if (ret)
244 goto err_alloc;
245 ret = create_constraint_attribute(i, "time_window_us",
246 S_IWUSR | S_IRUGO,
247 &constraint_attrs[i].time_window_attr,
248 show_constraint_time_window_us,
249 store_constraint_time_window_us);
250 if (ret)
251 goto err_alloc;
252 ret = create_constraint_attribute(i, "name", S_IRUGO,
253 &constraint_attrs[i].name_attr,
254 show_constraint_name,
255 NULL);
256 if (ret)
257 goto err_alloc;
258 ret = create_constraint_attribute(i, "max_power_uw", S_IRUGO,
259 &constraint_attrs[i].max_power_attr,
260 show_constraint_max_power_uw,
261 NULL);
262 if (ret)
263 goto err_alloc;
264 ret = create_constraint_attribute(i, "min_power_uw", S_IRUGO,
265 &constraint_attrs[i].min_power_attr,
266 show_constraint_min_power_uw,
267 NULL);
268 if (ret)
269 goto err_alloc;
270 ret = create_constraint_attribute(i, "max_time_window_us",
271 S_IRUGO,
272 &constraint_attrs[i].max_time_window_attr,
273 show_constraint_max_time_window_us,
274 NULL);
275 if (ret)
276 goto err_alloc;
277 ret = create_constraint_attribute(i, "min_time_window_us",
278 S_IRUGO,
279 &constraint_attrs[i].min_time_window_attr,
280 show_constraint_min_time_window_us,
281 NULL);
282 if (ret)
283 goto err_alloc;
284
285 }
286
287 return 0;
288
289err_alloc:
290 free_constraint_attributes();
291
292 return ret;
293}
294
295static int create_constraints(struct powercap_zone *power_zone,
296 int nr_constraints,
297 const struct powercap_zone_constraint_ops *const_ops)
298{
299 int i;
300 int ret = 0;
301 int count;
302 struct powercap_zone_constraint *pconst;
303
304 if (!power_zone || !const_ops || !const_ops->get_power_limit_uw ||
305 !const_ops->set_power_limit_uw ||
306 !const_ops->get_time_window_us ||
307 !const_ops->set_time_window_us)
308 return -EINVAL;
309
310 count = power_zone->zone_attr_count;
311 for (i = 0; i < nr_constraints; ++i) {
312 pconst = &power_zone->constraints[i];
313 pconst->ops = const_ops;
314 pconst->id = power_zone->const_id_cnt;
315 power_zone->const_id_cnt++;
316 power_zone->zone_dev_attrs[count++] =
317 &constraint_attrs[i].power_limit_attr.attr;
318 power_zone->zone_dev_attrs[count++] =
319 &constraint_attrs[i].time_window_attr.attr;
320 if (pconst->ops->get_name)
321 power_zone->zone_dev_attrs[count++] =
322 &constraint_attrs[i].name_attr.attr;
323 if (pconst->ops->get_max_power_uw)
324 power_zone->zone_dev_attrs[count++] =
325 &constraint_attrs[i].max_power_attr.attr;
326 if (pconst->ops->get_min_power_uw)
327 power_zone->zone_dev_attrs[count++] =
328 &constraint_attrs[i].min_power_attr.attr;
329 if (pconst->ops->get_max_time_window_us)
330 power_zone->zone_dev_attrs[count++] =
331 &constraint_attrs[i].max_time_window_attr.attr;
332 if (pconst->ops->get_min_time_window_us)
333 power_zone->zone_dev_attrs[count++] =
334 &constraint_attrs[i].min_time_window_attr.attr;
335 }
336 power_zone->zone_attr_count = count;
337
338 return ret;
339}
340
341static bool control_type_valid(void *control_type)
342{
343 struct powercap_control_type *pos = NULL;
344 bool found = false;
345
346 mutex_lock(&powercap_cntrl_list_lock);
347
348 list_for_each_entry(pos, &powercap_cntrl_list, node) {
349 if (pos == control_type) {
350 found = true;
351 break;
352 }
353 }
354 mutex_unlock(&powercap_cntrl_list_lock);
355
356 return found;
357}
358
359static ssize_t name_show(struct device *dev,
360 struct device_attribute *attr,
361 char *buf)
362{
363 struct powercap_zone *power_zone = to_powercap_zone(dev);
364
365 return sprintf(buf, "%s\n", power_zone->name);
366}
367
368static DEVICE_ATTR_RO(name);
369
370
371static void create_power_zone_common_attributes(
372 struct powercap_zone *power_zone)
373{
374 int count = 0;
375
376 power_zone->zone_dev_attrs[count++] = &dev_attr_name.attr;
377 if (power_zone->ops->get_max_energy_range_uj)
378 power_zone->zone_dev_attrs[count++] =
379 &dev_attr_max_energy_range_uj.attr;
380 if (power_zone->ops->get_energy_uj) {
381 if (power_zone->ops->reset_energy_uj)
382 dev_attr_energy_uj.attr.mode = S_IWUSR | S_IRUGO;
383 else
384 dev_attr_energy_uj.attr.mode = S_IRUGO;
385 power_zone->zone_dev_attrs[count++] =
386 &dev_attr_energy_uj.attr;
387 }
388 if (power_zone->ops->get_power_uw)
389 power_zone->zone_dev_attrs[count++] =
390 &dev_attr_power_uw.attr;
391 if (power_zone->ops->get_max_power_range_uw)
392 power_zone->zone_dev_attrs[count++] =
393 &dev_attr_max_power_range_uw.attr;
394 power_zone->zone_dev_attrs[count] = NULL;
395 power_zone->zone_attr_count = count;
396}
397
398static void powercap_release(struct device *dev)
399{
400 bool allocated;
401
402 if (dev->parent) {
403 struct powercap_zone *power_zone = to_powercap_zone(dev);
404
405
406 allocated = power_zone->allocated;
407
408 idr_remove(power_zone->parent_idr, power_zone->id);
409
410 idr_destroy(&power_zone->idr);
411 kfree(power_zone->name);
412 kfree(power_zone->zone_dev_attrs);
413 kfree(power_zone->constraints);
414 if (power_zone->ops->release)
415 power_zone->ops->release(power_zone);
416 if (allocated)
417 kfree(power_zone);
418 } else {
419 struct powercap_control_type *control_type =
420 to_powercap_control_type(dev);
421
422
423 allocated = control_type->allocated;
424 idr_destroy(&control_type->idr);
425 mutex_destroy(&control_type->lock);
426 if (control_type->ops && control_type->ops->release)
427 control_type->ops->release(control_type);
428 if (allocated)
429 kfree(control_type);
430 }
431}
432
433static ssize_t enabled_show(struct device *dev,
434 struct device_attribute *attr,
435 char *buf)
436{
437 bool mode = true;
438
439
440 if (dev->parent) {
441 struct powercap_zone *power_zone = to_powercap_zone(dev);
442 if (power_zone->ops->get_enable)
443 if (power_zone->ops->get_enable(power_zone, &mode))
444 mode = false;
445 } else {
446 struct powercap_control_type *control_type =
447 to_powercap_control_type(dev);
448 if (control_type->ops && control_type->ops->get_enable)
449 if (control_type->ops->get_enable(control_type, &mode))
450 mode = false;
451 }
452
453 return sprintf(buf, "%d\n", mode);
454}
455
456static ssize_t enabled_store(struct device *dev,
457 struct device_attribute *attr,
458 const char *buf, size_t len)
459{
460 bool mode;
461
462 if (strtobool(buf, &mode))
463 return -EINVAL;
464 if (dev->parent) {
465 struct powercap_zone *power_zone = to_powercap_zone(dev);
466 if (power_zone->ops->set_enable)
467 if (!power_zone->ops->set_enable(power_zone, mode))
468 return len;
469 } else {
470 struct powercap_control_type *control_type =
471 to_powercap_control_type(dev);
472 if (control_type->ops && control_type->ops->set_enable)
473 if (!control_type->ops->set_enable(control_type, mode))
474 return len;
475 }
476
477 return -ENOSYS;
478}
479
480static DEVICE_ATTR_RW(enabled);
481
482static struct attribute *powercap_attrs[] = {
483 &dev_attr_enabled.attr,
484 NULL,
485};
486ATTRIBUTE_GROUPS(powercap);
487
488static struct class powercap_class = {
489 .name = "powercap",
490 .dev_release = powercap_release,
491 .dev_groups = powercap_groups,
492};
493
494struct powercap_zone *powercap_register_zone(
495 struct powercap_zone *power_zone,
496 struct powercap_control_type *control_type,
497 const char *name,
498 struct powercap_zone *parent,
499 const struct powercap_zone_ops *ops,
500 int nr_constraints,
501 const struct powercap_zone_constraint_ops *const_ops)
502{
503 int result;
504 int nr_attrs;
505
506 if (!name || !control_type || !ops ||
507 nr_constraints > MAX_CONSTRAINTS_PER_ZONE ||
508 (!ops->get_energy_uj && !ops->get_power_uw) ||
509 !control_type_valid(control_type))
510 return ERR_PTR(-EINVAL);
511
512 if (power_zone) {
513 if (!ops->release)
514 return ERR_PTR(-EINVAL);
515 memset(power_zone, 0, sizeof(*power_zone));
516 } else {
517 power_zone = kzalloc(sizeof(*power_zone), GFP_KERNEL);
518 if (!power_zone)
519 return ERR_PTR(-ENOMEM);
520 power_zone->allocated = true;
521 }
522 power_zone->ops = ops;
523 power_zone->control_type_inst = control_type;
524 if (!parent) {
525 power_zone->dev.parent = &control_type->dev;
526 power_zone->parent_idr = &control_type->idr;
527 } else {
528 power_zone->dev.parent = &parent->dev;
529 power_zone->parent_idr = &parent->idr;
530 }
531 power_zone->dev.class = &powercap_class;
532
533 mutex_lock(&control_type->lock);
534
535 result = idr_alloc(power_zone->parent_idr, NULL, 0, 0, GFP_KERNEL);
536 if (result < 0)
537 goto err_idr_alloc;
538
539 power_zone->id = result;
540 idr_init(&power_zone->idr);
541 power_zone->name = kstrdup(name, GFP_KERNEL);
542 if (!power_zone->name)
543 goto err_name_alloc;
544 dev_set_name(&power_zone->dev, "%s:%x",
545 dev_name(power_zone->dev.parent),
546 power_zone->id);
547 power_zone->constraints = kzalloc(sizeof(*power_zone->constraints) *
548 nr_constraints, GFP_KERNEL);
549 if (!power_zone->constraints)
550 goto err_const_alloc;
551
552 nr_attrs = nr_constraints * POWERCAP_CONSTRAINTS_ATTRS +
553 POWERCAP_ZONE_MAX_ATTRS + 1;
554 power_zone->zone_dev_attrs = kzalloc(sizeof(void *) *
555 nr_attrs, GFP_KERNEL);
556 if (!power_zone->zone_dev_attrs)
557 goto err_attr_alloc;
558 create_power_zone_common_attributes(power_zone);
559 result = create_constraints(power_zone, nr_constraints, const_ops);
560 if (result)
561 goto err_dev_ret;
562
563 power_zone->zone_dev_attrs[power_zone->zone_attr_count] = NULL;
564 power_zone->dev_zone_attr_group.attrs = power_zone->zone_dev_attrs;
565 power_zone->dev_attr_groups[0] = &power_zone->dev_zone_attr_group;
566 power_zone->dev_attr_groups[1] = NULL;
567 power_zone->dev.groups = power_zone->dev_attr_groups;
568 result = device_register(&power_zone->dev);
569 if (result)
570 goto err_dev_ret;
571
572 control_type->nr_zones++;
573 mutex_unlock(&control_type->lock);
574
575 return power_zone;
576
577err_dev_ret:
578 kfree(power_zone->zone_dev_attrs);
579err_attr_alloc:
580 kfree(power_zone->constraints);
581err_const_alloc:
582 kfree(power_zone->name);
583err_name_alloc:
584 idr_remove(power_zone->parent_idr, power_zone->id);
585err_idr_alloc:
586 if (power_zone->allocated)
587 kfree(power_zone);
588 mutex_unlock(&control_type->lock);
589
590 return ERR_PTR(result);
591}
592EXPORT_SYMBOL_GPL(powercap_register_zone);
593
594int powercap_unregister_zone(struct powercap_control_type *control_type,
595 struct powercap_zone *power_zone)
596{
597 if (!power_zone || !control_type)
598 return -EINVAL;
599
600 mutex_lock(&control_type->lock);
601 control_type->nr_zones--;
602 mutex_unlock(&control_type->lock);
603
604 device_unregister(&power_zone->dev);
605
606 return 0;
607}
608EXPORT_SYMBOL_GPL(powercap_unregister_zone);
609
610struct powercap_control_type *powercap_register_control_type(
611 struct powercap_control_type *control_type,
612 const char *name,
613 const struct powercap_control_type_ops *ops)
614{
615 int result;
616
617 if (!name)
618 return ERR_PTR(-EINVAL);
619 if (control_type) {
620 if (!ops || !ops->release)
621 return ERR_PTR(-EINVAL);
622 memset(control_type, 0, sizeof(*control_type));
623 } else {
624 control_type = kzalloc(sizeof(*control_type), GFP_KERNEL);
625 if (!control_type)
626 return ERR_PTR(-ENOMEM);
627 control_type->allocated = true;
628 }
629 mutex_init(&control_type->lock);
630 control_type->ops = ops;
631 INIT_LIST_HEAD(&control_type->node);
632 control_type->dev.class = &powercap_class;
633 dev_set_name(&control_type->dev, "%s", name);
634 result = device_register(&control_type->dev);
635 if (result) {
636 if (control_type->allocated)
637 kfree(control_type);
638 return ERR_PTR(result);
639 }
640 idr_init(&control_type->idr);
641
642 mutex_lock(&powercap_cntrl_list_lock);
643 list_add_tail(&control_type->node, &powercap_cntrl_list);
644 mutex_unlock(&powercap_cntrl_list_lock);
645
646 return control_type;
647}
648EXPORT_SYMBOL_GPL(powercap_register_control_type);
649
650int powercap_unregister_control_type(struct powercap_control_type *control_type)
651{
652 struct powercap_control_type *pos = NULL;
653
654 if (control_type->nr_zones) {
655 dev_err(&control_type->dev, "Zones of this type still not freed\n");
656 return -EINVAL;
657 }
658 mutex_lock(&powercap_cntrl_list_lock);
659 list_for_each_entry(pos, &powercap_cntrl_list, node) {
660 if (pos == control_type) {
661 list_del(&control_type->node);
662 mutex_unlock(&powercap_cntrl_list_lock);
663 device_unregister(&control_type->dev);
664 return 0;
665 }
666 }
667 mutex_unlock(&powercap_cntrl_list_lock);
668
669 return -ENODEV;
670}
671EXPORT_SYMBOL_GPL(powercap_unregister_control_type);
672
673static int __init powercap_init(void)
674{
675 int result = 0;
676
677 result = seed_constraint_attributes();
678 if (result)
679 return result;
680
681 result = class_register(&powercap_class);
682
683 return result;
684}
685
686device_initcall(powercap_init);
687
688MODULE_DESCRIPTION("PowerCap sysfs Driver");
689MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
690MODULE_LICENSE("GPL v2");
691
