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2d281d81 JP |
1 | /* |
2 | * Intel Running Average Power Limit (RAPL) Driver | |
3 | * Copyright (c) 2013, Intel Corporation. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc. | |
16 | * | |
17 | */ | |
18 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
19 | ||
20 | #include <linux/kernel.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/list.h> | |
23 | #include <linux/types.h> | |
24 | #include <linux/device.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/log2.h> | |
27 | #include <linux/bitmap.h> | |
28 | #include <linux/delay.h> | |
29 | #include <linux/sysfs.h> | |
30 | #include <linux/cpu.h> | |
31 | #include <linux/powercap.h> | |
3c2c0845 | 32 | #include <asm/iosf_mbi.h> |
2d281d81 JP |
33 | |
34 | #include <asm/processor.h> | |
35 | #include <asm/cpu_device_id.h> | |
36 | ||
37 | /* bitmasks for RAPL MSRs, used by primitive access functions */ | |
38 | #define ENERGY_STATUS_MASK 0xffffffff | |
39 | ||
40 | #define POWER_LIMIT1_MASK 0x7FFF | |
41 | #define POWER_LIMIT1_ENABLE BIT(15) | |
42 | #define POWER_LIMIT1_CLAMP BIT(16) | |
43 | ||
44 | #define POWER_LIMIT2_MASK (0x7FFFULL<<32) | |
45 | #define POWER_LIMIT2_ENABLE BIT_ULL(47) | |
46 | #define POWER_LIMIT2_CLAMP BIT_ULL(48) | |
47 | #define POWER_PACKAGE_LOCK BIT_ULL(63) | |
48 | #define POWER_PP_LOCK BIT(31) | |
49 | ||
50 | #define TIME_WINDOW1_MASK (0x7FULL<<17) | |
51 | #define TIME_WINDOW2_MASK (0x7FULL<<49) | |
52 | ||
53 | #define POWER_UNIT_OFFSET 0 | |
54 | #define POWER_UNIT_MASK 0x0F | |
55 | ||
56 | #define ENERGY_UNIT_OFFSET 0x08 | |
57 | #define ENERGY_UNIT_MASK 0x1F00 | |
58 | ||
59 | #define TIME_UNIT_OFFSET 0x10 | |
60 | #define TIME_UNIT_MASK 0xF0000 | |
61 | ||
62 | #define POWER_INFO_MAX_MASK (0x7fffULL<<32) | |
63 | #define POWER_INFO_MIN_MASK (0x7fffULL<<16) | |
64 | #define POWER_INFO_MAX_TIME_WIN_MASK (0x3fULL<<48) | |
65 | #define POWER_INFO_THERMAL_SPEC_MASK 0x7fff | |
66 | ||
67 | #define PERF_STATUS_THROTTLE_TIME_MASK 0xffffffff | |
68 | #define PP_POLICY_MASK 0x1F | |
69 | ||
70 | /* Non HW constants */ | |
71 | #define RAPL_PRIMITIVE_DERIVED BIT(1) /* not from raw data */ | |
72 | #define RAPL_PRIMITIVE_DUMMY BIT(2) | |
73 | ||
2d281d81 JP |
74 | #define TIME_WINDOW_MAX_MSEC 40000 |
75 | #define TIME_WINDOW_MIN_MSEC 250 | |
d474a4d3 | 76 | #define ENERGY_UNIT_SCALE 1000 /* scale from driver unit to powercap unit */ |
2d281d81 JP |
77 | enum unit_type { |
78 | ARBITRARY_UNIT, /* no translation */ | |
79 | POWER_UNIT, | |
80 | ENERGY_UNIT, | |
81 | TIME_UNIT, | |
82 | }; | |
83 | ||
84 | enum rapl_domain_type { | |
85 | RAPL_DOMAIN_PACKAGE, /* entire package/socket */ | |
86 | RAPL_DOMAIN_PP0, /* core power plane */ | |
87 | RAPL_DOMAIN_PP1, /* graphics uncore */ | |
88 | RAPL_DOMAIN_DRAM,/* DRAM control_type */ | |
89 | RAPL_DOMAIN_MAX, | |
90 | }; | |
91 | ||
92 | enum rapl_domain_msr_id { | |
93 | RAPL_DOMAIN_MSR_LIMIT, | |
94 | RAPL_DOMAIN_MSR_STATUS, | |
95 | RAPL_DOMAIN_MSR_PERF, | |
96 | RAPL_DOMAIN_MSR_POLICY, | |
97 | RAPL_DOMAIN_MSR_INFO, | |
98 | RAPL_DOMAIN_MSR_MAX, | |
99 | }; | |
100 | ||
101 | /* per domain data, some are optional */ | |
102 | enum rapl_primitives { | |
103 | ENERGY_COUNTER, | |
104 | POWER_LIMIT1, | |
105 | POWER_LIMIT2, | |
106 | FW_LOCK, | |
107 | ||
108 | PL1_ENABLE, /* power limit 1, aka long term */ | |
109 | PL1_CLAMP, /* allow frequency to go below OS request */ | |
110 | PL2_ENABLE, /* power limit 2, aka short term, instantaneous */ | |
111 | PL2_CLAMP, | |
112 | ||
113 | TIME_WINDOW1, /* long term */ | |
114 | TIME_WINDOW2, /* short term */ | |
115 | THERMAL_SPEC_POWER, | |
116 | MAX_POWER, | |
117 | ||
118 | MIN_POWER, | |
119 | MAX_TIME_WINDOW, | |
120 | THROTTLED_TIME, | |
121 | PRIORITY_LEVEL, | |
122 | ||
123 | /* below are not raw primitive data */ | |
124 | AVERAGE_POWER, | |
125 | NR_RAPL_PRIMITIVES, | |
126 | }; | |
127 | ||
128 | #define NR_RAW_PRIMITIVES (NR_RAPL_PRIMITIVES - 2) | |
129 | ||
130 | /* Can be expanded to include events, etc.*/ | |
131 | struct rapl_domain_data { | |
132 | u64 primitives[NR_RAPL_PRIMITIVES]; | |
133 | unsigned long timestamp; | |
134 | }; | |
135 | ||
136 | ||
137 | #define DOMAIN_STATE_INACTIVE BIT(0) | |
138 | #define DOMAIN_STATE_POWER_LIMIT_SET BIT(1) | |
139 | #define DOMAIN_STATE_BIOS_LOCKED BIT(2) | |
140 | ||
141 | #define NR_POWER_LIMITS (2) | |
142 | struct rapl_power_limit { | |
143 | struct powercap_zone_constraint *constraint; | |
144 | int prim_id; /* primitive ID used to enable */ | |
145 | struct rapl_domain *domain; | |
146 | const char *name; | |
147 | }; | |
148 | ||
149 | static const char pl1_name[] = "long_term"; | |
150 | static const char pl2_name[] = "short_term"; | |
151 | ||
152 | struct rapl_domain { | |
153 | const char *name; | |
154 | enum rapl_domain_type id; | |
155 | int msrs[RAPL_DOMAIN_MSR_MAX]; | |
156 | struct powercap_zone power_zone; | |
157 | struct rapl_domain_data rdd; | |
158 | struct rapl_power_limit rpl[NR_POWER_LIMITS]; | |
159 | u64 attr_map; /* track capabilities */ | |
160 | unsigned int state; | |
d474a4d3 | 161 | unsigned int domain_energy_unit; |
2d281d81 JP |
162 | int package_id; |
163 | }; | |
164 | #define power_zone_to_rapl_domain(_zone) \ | |
165 | container_of(_zone, struct rapl_domain, power_zone) | |
166 | ||
167 | ||
168 | /* Each physical package contains multiple domains, these are the common | |
169 | * data across RAPL domains within a package. | |
170 | */ | |
171 | struct rapl_package { | |
172 | unsigned int id; /* physical package/socket id */ | |
173 | unsigned int nr_domains; | |
174 | unsigned long domain_map; /* bit map of active domains */ | |
3c2c0845 JP |
175 | unsigned int power_unit; |
176 | unsigned int energy_unit; | |
177 | unsigned int time_unit; | |
2d281d81 JP |
178 | struct rapl_domain *domains; /* array of domains, sized at runtime */ |
179 | struct powercap_zone *power_zone; /* keep track of parent zone */ | |
180 | int nr_cpus; /* active cpus on the package, topology info is lost during | |
181 | * cpu hotplug. so we have to track ourselves. | |
182 | */ | |
183 | unsigned long power_limit_irq; /* keep track of package power limit | |
184 | * notify interrupt enable status. | |
185 | */ | |
186 | struct list_head plist; | |
187 | }; | |
087e9cba JP |
188 | |
189 | struct rapl_defaults { | |
51b63409 | 190 | u8 floor_freq_reg_addr; |
087e9cba JP |
191 | int (*check_unit)(struct rapl_package *rp, int cpu); |
192 | void (*set_floor_freq)(struct rapl_domain *rd, bool mode); | |
193 | u64 (*compute_time_window)(struct rapl_package *rp, u64 val, | |
194 | bool to_raw); | |
d474a4d3 | 195 | unsigned int dram_domain_energy_unit; |
087e9cba JP |
196 | }; |
197 | static struct rapl_defaults *rapl_defaults; | |
198 | ||
3c2c0845 | 199 | /* Sideband MBI registers */ |
51b63409 AT |
200 | #define IOSF_CPU_POWER_BUDGET_CTL_BYT (0x2) |
201 | #define IOSF_CPU_POWER_BUDGET_CTL_TNG (0xdf) | |
3c2c0845 | 202 | |
2d281d81 JP |
203 | #define PACKAGE_PLN_INT_SAVED BIT(0) |
204 | #define MAX_PRIM_NAME (32) | |
205 | ||
206 | /* per domain data. used to describe individual knobs such that access function | |
207 | * can be consolidated into one instead of many inline functions. | |
208 | */ | |
209 | struct rapl_primitive_info { | |
210 | const char *name; | |
211 | u64 mask; | |
212 | int shift; | |
213 | enum rapl_domain_msr_id id; | |
214 | enum unit_type unit; | |
215 | u32 flag; | |
216 | }; | |
217 | ||
218 | #define PRIMITIVE_INFO_INIT(p, m, s, i, u, f) { \ | |
219 | .name = #p, \ | |
220 | .mask = m, \ | |
221 | .shift = s, \ | |
222 | .id = i, \ | |
223 | .unit = u, \ | |
224 | .flag = f \ | |
225 | } | |
226 | ||
227 | static void rapl_init_domains(struct rapl_package *rp); | |
228 | static int rapl_read_data_raw(struct rapl_domain *rd, | |
229 | enum rapl_primitives prim, | |
230 | bool xlate, u64 *data); | |
231 | static int rapl_write_data_raw(struct rapl_domain *rd, | |
232 | enum rapl_primitives prim, | |
233 | unsigned long long value); | |
d474a4d3 JP |
234 | static u64 rapl_unit_xlate(struct rapl_domain *rd, int package, |
235 | enum unit_type type, u64 value, | |
2d281d81 JP |
236 | int to_raw); |
237 | static void package_power_limit_irq_save(int package_id); | |
238 | ||
239 | static LIST_HEAD(rapl_packages); /* guarded by CPU hotplug lock */ | |
240 | ||
241 | static const char * const rapl_domain_names[] = { | |
242 | "package", | |
243 | "core", | |
244 | "uncore", | |
245 | "dram", | |
246 | }; | |
247 | ||
248 | static struct powercap_control_type *control_type; /* PowerCap Controller */ | |
249 | ||
250 | /* caller to ensure CPU hotplug lock is held */ | |
251 | static struct rapl_package *find_package_by_id(int id) | |
252 | { | |
253 | struct rapl_package *rp; | |
254 | ||
255 | list_for_each_entry(rp, &rapl_packages, plist) { | |
256 | if (rp->id == id) | |
257 | return rp; | |
258 | } | |
259 | ||
260 | return NULL; | |
261 | } | |
262 | ||
263 | /* caller to ensure CPU hotplug lock is held */ | |
264 | static int find_active_cpu_on_package(int package_id) | |
265 | { | |
266 | int i; | |
267 | ||
268 | for_each_online_cpu(i) { | |
269 | if (topology_physical_package_id(i) == package_id) | |
270 | return i; | |
271 | } | |
272 | /* all CPUs on this package are offline */ | |
273 | ||
274 | return -ENODEV; | |
275 | } | |
276 | ||
277 | /* caller must hold cpu hotplug lock */ | |
278 | static void rapl_cleanup_data(void) | |
279 | { | |
280 | struct rapl_package *p, *tmp; | |
281 | ||
282 | list_for_each_entry_safe(p, tmp, &rapl_packages, plist) { | |
283 | kfree(p->domains); | |
284 | list_del(&p->plist); | |
285 | kfree(p); | |
286 | } | |
287 | } | |
288 | ||
289 | static int get_energy_counter(struct powercap_zone *power_zone, u64 *energy_raw) | |
290 | { | |
291 | struct rapl_domain *rd; | |
292 | u64 energy_now; | |
293 | ||
294 | /* prevent CPU hotplug, make sure the RAPL domain does not go | |
295 | * away while reading the counter. | |
296 | */ | |
297 | get_online_cpus(); | |
298 | rd = power_zone_to_rapl_domain(power_zone); | |
299 | ||
300 | if (!rapl_read_data_raw(rd, ENERGY_COUNTER, true, &energy_now)) { | |
301 | *energy_raw = energy_now; | |
302 | put_online_cpus(); | |
303 | ||
304 | return 0; | |
305 | } | |
306 | put_online_cpus(); | |
307 | ||
308 | return -EIO; | |
309 | } | |
310 | ||
311 | static int get_max_energy_counter(struct powercap_zone *pcd_dev, u64 *energy) | |
312 | { | |
d474a4d3 JP |
313 | struct rapl_domain *rd = power_zone_to_rapl_domain(pcd_dev); |
314 | ||
315 | *energy = rapl_unit_xlate(rd, 0, ENERGY_UNIT, ENERGY_STATUS_MASK, 0); | |
2d281d81 JP |
316 | return 0; |
317 | } | |
318 | ||
319 | static int release_zone(struct powercap_zone *power_zone) | |
320 | { | |
321 | struct rapl_domain *rd = power_zone_to_rapl_domain(power_zone); | |
322 | struct rapl_package *rp; | |
323 | ||
324 | /* package zone is the last zone of a package, we can free | |
325 | * memory here since all children has been unregistered. | |
326 | */ | |
327 | if (rd->id == RAPL_DOMAIN_PACKAGE) { | |
328 | rp = find_package_by_id(rd->package_id); | |
329 | if (!rp) { | |
330 | dev_warn(&power_zone->dev, "no package id %s\n", | |
331 | rd->name); | |
332 | return -ENODEV; | |
333 | } | |
334 | kfree(rd); | |
335 | rp->domains = NULL; | |
336 | } | |
337 | ||
338 | return 0; | |
339 | ||
340 | } | |
341 | ||
342 | static int find_nr_power_limit(struct rapl_domain *rd) | |
343 | { | |
344 | int i; | |
345 | ||
346 | for (i = 0; i < NR_POWER_LIMITS; i++) { | |
347 | if (rd->rpl[i].name == NULL) | |
348 | break; | |
349 | } | |
350 | ||
351 | return i; | |
352 | } | |
353 | ||
354 | static int set_domain_enable(struct powercap_zone *power_zone, bool mode) | |
355 | { | |
356 | struct rapl_domain *rd = power_zone_to_rapl_domain(power_zone); | |
2d281d81 JP |
357 | |
358 | if (rd->state & DOMAIN_STATE_BIOS_LOCKED) | |
359 | return -EACCES; | |
3c2c0845 | 360 | |
2d281d81 | 361 | get_online_cpus(); |
2d281d81 | 362 | rapl_write_data_raw(rd, PL1_ENABLE, mode); |
51b63409 AT |
363 | if (rapl_defaults->set_floor_freq) |
364 | rapl_defaults->set_floor_freq(rd, mode); | |
2d281d81 JP |
365 | put_online_cpus(); |
366 | ||
367 | return 0; | |
368 | } | |
369 | ||
370 | static int get_domain_enable(struct powercap_zone *power_zone, bool *mode) | |
371 | { | |
372 | struct rapl_domain *rd = power_zone_to_rapl_domain(power_zone); | |
373 | u64 val; | |
374 | ||
375 | if (rd->state & DOMAIN_STATE_BIOS_LOCKED) { | |
376 | *mode = false; | |
377 | return 0; | |
378 | } | |
379 | get_online_cpus(); | |
380 | if (rapl_read_data_raw(rd, PL1_ENABLE, true, &val)) { | |
381 | put_online_cpus(); | |
382 | return -EIO; | |
383 | } | |
384 | *mode = val; | |
385 | put_online_cpus(); | |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
390 | /* per RAPL domain ops, in the order of rapl_domain_type */ | |
600c395b | 391 | static const struct powercap_zone_ops zone_ops[] = { |
2d281d81 JP |
392 | /* RAPL_DOMAIN_PACKAGE */ |
393 | { | |
394 | .get_energy_uj = get_energy_counter, | |
395 | .get_max_energy_range_uj = get_max_energy_counter, | |
396 | .release = release_zone, | |
397 | .set_enable = set_domain_enable, | |
398 | .get_enable = get_domain_enable, | |
399 | }, | |
400 | /* RAPL_DOMAIN_PP0 */ | |
401 | { | |
402 | .get_energy_uj = get_energy_counter, | |
403 | .get_max_energy_range_uj = get_max_energy_counter, | |
404 | .release = release_zone, | |
405 | .set_enable = set_domain_enable, | |
406 | .get_enable = get_domain_enable, | |
407 | }, | |
408 | /* RAPL_DOMAIN_PP1 */ | |
409 | { | |
410 | .get_energy_uj = get_energy_counter, | |
411 | .get_max_energy_range_uj = get_max_energy_counter, | |
412 | .release = release_zone, | |
413 | .set_enable = set_domain_enable, | |
414 | .get_enable = get_domain_enable, | |
415 | }, | |
416 | /* RAPL_DOMAIN_DRAM */ | |
417 | { | |
418 | .get_energy_uj = get_energy_counter, | |
419 | .get_max_energy_range_uj = get_max_energy_counter, | |
420 | .release = release_zone, | |
421 | .set_enable = set_domain_enable, | |
422 | .get_enable = get_domain_enable, | |
423 | }, | |
424 | }; | |
425 | ||
426 | static int set_power_limit(struct powercap_zone *power_zone, int id, | |
427 | u64 power_limit) | |
428 | { | |
429 | struct rapl_domain *rd; | |
430 | struct rapl_package *rp; | |
431 | int ret = 0; | |
432 | ||
433 | get_online_cpus(); | |
434 | rd = power_zone_to_rapl_domain(power_zone); | |
435 | rp = find_package_by_id(rd->package_id); | |
436 | if (!rp) { | |
437 | ret = -ENODEV; | |
438 | goto set_exit; | |
439 | } | |
440 | ||
441 | if (rd->state & DOMAIN_STATE_BIOS_LOCKED) { | |
442 | dev_warn(&power_zone->dev, "%s locked by BIOS, monitoring only\n", | |
443 | rd->name); | |
444 | ret = -EACCES; | |
445 | goto set_exit; | |
446 | } | |
447 | ||
448 | switch (rd->rpl[id].prim_id) { | |
449 | case PL1_ENABLE: | |
450 | rapl_write_data_raw(rd, POWER_LIMIT1, power_limit); | |
451 | break; | |
452 | case PL2_ENABLE: | |
453 | rapl_write_data_raw(rd, POWER_LIMIT2, power_limit); | |
454 | break; | |
455 | default: | |
456 | ret = -EINVAL; | |
457 | } | |
458 | if (!ret) | |
459 | package_power_limit_irq_save(rd->package_id); | |
460 | set_exit: | |
461 | put_online_cpus(); | |
462 | return ret; | |
463 | } | |
464 | ||
465 | static int get_current_power_limit(struct powercap_zone *power_zone, int id, | |
466 | u64 *data) | |
467 | { | |
468 | struct rapl_domain *rd; | |
469 | u64 val; | |
470 | int prim; | |
471 | int ret = 0; | |
472 | ||
473 | get_online_cpus(); | |
474 | rd = power_zone_to_rapl_domain(power_zone); | |
475 | switch (rd->rpl[id].prim_id) { | |
476 | case PL1_ENABLE: | |
477 | prim = POWER_LIMIT1; | |
478 | break; | |
479 | case PL2_ENABLE: | |
480 | prim = POWER_LIMIT2; | |
481 | break; | |
482 | default: | |
483 | put_online_cpus(); | |
484 | return -EINVAL; | |
485 | } | |
486 | if (rapl_read_data_raw(rd, prim, true, &val)) | |
487 | ret = -EIO; | |
488 | else | |
489 | *data = val; | |
490 | ||
491 | put_online_cpus(); | |
492 | ||
493 | return ret; | |
494 | } | |
495 | ||
496 | static int set_time_window(struct powercap_zone *power_zone, int id, | |
497 | u64 window) | |
498 | { | |
499 | struct rapl_domain *rd; | |
500 | int ret = 0; | |
501 | ||
502 | get_online_cpus(); | |
503 | rd = power_zone_to_rapl_domain(power_zone); | |
504 | switch (rd->rpl[id].prim_id) { | |
505 | case PL1_ENABLE: | |
506 | rapl_write_data_raw(rd, TIME_WINDOW1, window); | |
507 | break; | |
508 | case PL2_ENABLE: | |
509 | rapl_write_data_raw(rd, TIME_WINDOW2, window); | |
510 | break; | |
511 | default: | |
512 | ret = -EINVAL; | |
513 | } | |
514 | put_online_cpus(); | |
515 | return ret; | |
516 | } | |
517 | ||
518 | static int get_time_window(struct powercap_zone *power_zone, int id, u64 *data) | |
519 | { | |
520 | struct rapl_domain *rd; | |
521 | u64 val; | |
522 | int ret = 0; | |
523 | ||
524 | get_online_cpus(); | |
525 | rd = power_zone_to_rapl_domain(power_zone); | |
526 | switch (rd->rpl[id].prim_id) { | |
527 | case PL1_ENABLE: | |
528 | ret = rapl_read_data_raw(rd, TIME_WINDOW1, true, &val); | |
529 | break; | |
530 | case PL2_ENABLE: | |
531 | ret = rapl_read_data_raw(rd, TIME_WINDOW2, true, &val); | |
532 | break; | |
533 | default: | |
534 | put_online_cpus(); | |
535 | return -EINVAL; | |
536 | } | |
537 | if (!ret) | |
538 | *data = val; | |
539 | put_online_cpus(); | |
540 | ||
541 | return ret; | |
542 | } | |
543 | ||
544 | static const char *get_constraint_name(struct powercap_zone *power_zone, int id) | |
545 | { | |
546 | struct rapl_power_limit *rpl; | |
547 | struct rapl_domain *rd; | |
548 | ||
549 | rd = power_zone_to_rapl_domain(power_zone); | |
550 | rpl = (struct rapl_power_limit *) &rd->rpl[id]; | |
551 | ||
552 | return rpl->name; | |
553 | } | |
554 | ||
555 | ||
556 | static int get_max_power(struct powercap_zone *power_zone, int id, | |
557 | u64 *data) | |
558 | { | |
559 | struct rapl_domain *rd; | |
560 | u64 val; | |
561 | int prim; | |
562 | int ret = 0; | |
563 | ||
564 | get_online_cpus(); | |
565 | rd = power_zone_to_rapl_domain(power_zone); | |
566 | switch (rd->rpl[id].prim_id) { | |
567 | case PL1_ENABLE: | |
568 | prim = THERMAL_SPEC_POWER; | |
569 | break; | |
570 | case PL2_ENABLE: | |
571 | prim = MAX_POWER; | |
572 | break; | |
573 | default: | |
574 | put_online_cpus(); | |
575 | return -EINVAL; | |
576 | } | |
577 | if (rapl_read_data_raw(rd, prim, true, &val)) | |
578 | ret = -EIO; | |
579 | else | |
580 | *data = val; | |
581 | ||
582 | put_online_cpus(); | |
583 | ||
584 | return ret; | |
585 | } | |
586 | ||
600c395b | 587 | static const struct powercap_zone_constraint_ops constraint_ops = { |
2d281d81 JP |
588 | .set_power_limit_uw = set_power_limit, |
589 | .get_power_limit_uw = get_current_power_limit, | |
590 | .set_time_window_us = set_time_window, | |
591 | .get_time_window_us = get_time_window, | |
592 | .get_max_power_uw = get_max_power, | |
593 | .get_name = get_constraint_name, | |
594 | }; | |
595 | ||
596 | /* called after domain detection and package level data are set */ | |
597 | static void rapl_init_domains(struct rapl_package *rp) | |
598 | { | |
599 | int i; | |
600 | struct rapl_domain *rd = rp->domains; | |
601 | ||
602 | for (i = 0; i < RAPL_DOMAIN_MAX; i++) { | |
603 | unsigned int mask = rp->domain_map & (1 << i); | |
604 | switch (mask) { | |
605 | case BIT(RAPL_DOMAIN_PACKAGE): | |
606 | rd->name = rapl_domain_names[RAPL_DOMAIN_PACKAGE]; | |
607 | rd->id = RAPL_DOMAIN_PACKAGE; | |
608 | rd->msrs[0] = MSR_PKG_POWER_LIMIT; | |
609 | rd->msrs[1] = MSR_PKG_ENERGY_STATUS; | |
610 | rd->msrs[2] = MSR_PKG_PERF_STATUS; | |
611 | rd->msrs[3] = 0; | |
612 | rd->msrs[4] = MSR_PKG_POWER_INFO; | |
613 | rd->rpl[0].prim_id = PL1_ENABLE; | |
614 | rd->rpl[0].name = pl1_name; | |
615 | rd->rpl[1].prim_id = PL2_ENABLE; | |
616 | rd->rpl[1].name = pl2_name; | |
617 | break; | |
618 | case BIT(RAPL_DOMAIN_PP0): | |
619 | rd->name = rapl_domain_names[RAPL_DOMAIN_PP0]; | |
620 | rd->id = RAPL_DOMAIN_PP0; | |
621 | rd->msrs[0] = MSR_PP0_POWER_LIMIT; | |
622 | rd->msrs[1] = MSR_PP0_ENERGY_STATUS; | |
623 | rd->msrs[2] = 0; | |
624 | rd->msrs[3] = MSR_PP0_POLICY; | |
625 | rd->msrs[4] = 0; | |
626 | rd->rpl[0].prim_id = PL1_ENABLE; | |
627 | rd->rpl[0].name = pl1_name; | |
628 | break; | |
629 | case BIT(RAPL_DOMAIN_PP1): | |
630 | rd->name = rapl_domain_names[RAPL_DOMAIN_PP1]; | |
631 | rd->id = RAPL_DOMAIN_PP1; | |
632 | rd->msrs[0] = MSR_PP1_POWER_LIMIT; | |
633 | rd->msrs[1] = MSR_PP1_ENERGY_STATUS; | |
634 | rd->msrs[2] = 0; | |
635 | rd->msrs[3] = MSR_PP1_POLICY; | |
636 | rd->msrs[4] = 0; | |
637 | rd->rpl[0].prim_id = PL1_ENABLE; | |
638 | rd->rpl[0].name = pl1_name; | |
639 | break; | |
640 | case BIT(RAPL_DOMAIN_DRAM): | |
641 | rd->name = rapl_domain_names[RAPL_DOMAIN_DRAM]; | |
642 | rd->id = RAPL_DOMAIN_DRAM; | |
643 | rd->msrs[0] = MSR_DRAM_POWER_LIMIT; | |
644 | rd->msrs[1] = MSR_DRAM_ENERGY_STATUS; | |
645 | rd->msrs[2] = MSR_DRAM_PERF_STATUS; | |
646 | rd->msrs[3] = 0; | |
647 | rd->msrs[4] = MSR_DRAM_POWER_INFO; | |
648 | rd->rpl[0].prim_id = PL1_ENABLE; | |
649 | rd->rpl[0].name = pl1_name; | |
d474a4d3 JP |
650 | rd->domain_energy_unit = |
651 | rapl_defaults->dram_domain_energy_unit; | |
652 | if (rd->domain_energy_unit) | |
653 | pr_info("DRAM domain energy unit %dpj\n", | |
654 | rd->domain_energy_unit); | |
2d281d81 JP |
655 | break; |
656 | } | |
657 | if (mask) { | |
658 | rd->package_id = rp->id; | |
659 | rd++; | |
660 | } | |
661 | } | |
662 | } | |
663 | ||
d474a4d3 JP |
664 | static u64 rapl_unit_xlate(struct rapl_domain *rd, int package, |
665 | enum unit_type type, u64 value, | |
2d281d81 JP |
666 | int to_raw) |
667 | { | |
3c2c0845 | 668 | u64 units = 1; |
2d281d81 | 669 | struct rapl_package *rp; |
d474a4d3 | 670 | u64 scale = 1; |
2d281d81 JP |
671 | |
672 | rp = find_package_by_id(package); | |
673 | if (!rp) | |
674 | return value; | |
675 | ||
676 | switch (type) { | |
677 | case POWER_UNIT: | |
3c2c0845 | 678 | units = rp->power_unit; |
2d281d81 JP |
679 | break; |
680 | case ENERGY_UNIT: | |
d474a4d3 JP |
681 | scale = ENERGY_UNIT_SCALE; |
682 | /* per domain unit takes precedence */ | |
683 | if (rd && rd->domain_energy_unit) | |
684 | units = rd->domain_energy_unit; | |
685 | else | |
686 | units = rp->energy_unit; | |
2d281d81 JP |
687 | break; |
688 | case TIME_UNIT: | |
3c2c0845 | 689 | return rapl_defaults->compute_time_window(rp, value, to_raw); |
2d281d81 JP |
690 | case ARBITRARY_UNIT: |
691 | default: | |
692 | return value; | |
693 | }; | |
694 | ||
695 | if (to_raw) | |
d474a4d3 | 696 | return div64_u64(value, units) * scale; |
3c2c0845 JP |
697 | |
698 | value *= units; | |
699 | ||
d474a4d3 | 700 | return div64_u64(value, scale); |
2d281d81 JP |
701 | } |
702 | ||
703 | /* in the order of enum rapl_primitives */ | |
704 | static struct rapl_primitive_info rpi[] = { | |
705 | /* name, mask, shift, msr index, unit divisor */ | |
706 | PRIMITIVE_INFO_INIT(ENERGY_COUNTER, ENERGY_STATUS_MASK, 0, | |
707 | RAPL_DOMAIN_MSR_STATUS, ENERGY_UNIT, 0), | |
708 | PRIMITIVE_INFO_INIT(POWER_LIMIT1, POWER_LIMIT1_MASK, 0, | |
709 | RAPL_DOMAIN_MSR_LIMIT, POWER_UNIT, 0), | |
710 | PRIMITIVE_INFO_INIT(POWER_LIMIT2, POWER_LIMIT2_MASK, 32, | |
711 | RAPL_DOMAIN_MSR_LIMIT, POWER_UNIT, 0), | |
712 | PRIMITIVE_INFO_INIT(FW_LOCK, POWER_PP_LOCK, 31, | |
713 | RAPL_DOMAIN_MSR_LIMIT, ARBITRARY_UNIT, 0), | |
714 | PRIMITIVE_INFO_INIT(PL1_ENABLE, POWER_LIMIT1_ENABLE, 15, | |
715 | RAPL_DOMAIN_MSR_LIMIT, ARBITRARY_UNIT, 0), | |
716 | PRIMITIVE_INFO_INIT(PL1_CLAMP, POWER_LIMIT1_CLAMP, 16, | |
717 | RAPL_DOMAIN_MSR_LIMIT, ARBITRARY_UNIT, 0), | |
718 | PRIMITIVE_INFO_INIT(PL2_ENABLE, POWER_LIMIT2_ENABLE, 47, | |
719 | RAPL_DOMAIN_MSR_LIMIT, ARBITRARY_UNIT, 0), | |
720 | PRIMITIVE_INFO_INIT(PL2_CLAMP, POWER_LIMIT2_CLAMP, 48, | |
721 | RAPL_DOMAIN_MSR_LIMIT, ARBITRARY_UNIT, 0), | |
722 | PRIMITIVE_INFO_INIT(TIME_WINDOW1, TIME_WINDOW1_MASK, 17, | |
723 | RAPL_DOMAIN_MSR_LIMIT, TIME_UNIT, 0), | |
724 | PRIMITIVE_INFO_INIT(TIME_WINDOW2, TIME_WINDOW2_MASK, 49, | |
725 | RAPL_DOMAIN_MSR_LIMIT, TIME_UNIT, 0), | |
726 | PRIMITIVE_INFO_INIT(THERMAL_SPEC_POWER, POWER_INFO_THERMAL_SPEC_MASK, | |
727 | 0, RAPL_DOMAIN_MSR_INFO, POWER_UNIT, 0), | |
728 | PRIMITIVE_INFO_INIT(MAX_POWER, POWER_INFO_MAX_MASK, 32, | |
729 | RAPL_DOMAIN_MSR_INFO, POWER_UNIT, 0), | |
730 | PRIMITIVE_INFO_INIT(MIN_POWER, POWER_INFO_MIN_MASK, 16, | |
731 | RAPL_DOMAIN_MSR_INFO, POWER_UNIT, 0), | |
732 | PRIMITIVE_INFO_INIT(MAX_TIME_WINDOW, POWER_INFO_MAX_TIME_WIN_MASK, 48, | |
733 | RAPL_DOMAIN_MSR_INFO, TIME_UNIT, 0), | |
734 | PRIMITIVE_INFO_INIT(THROTTLED_TIME, PERF_STATUS_THROTTLE_TIME_MASK, 0, | |
735 | RAPL_DOMAIN_MSR_PERF, TIME_UNIT, 0), | |
736 | PRIMITIVE_INFO_INIT(PRIORITY_LEVEL, PP_POLICY_MASK, 0, | |
737 | RAPL_DOMAIN_MSR_POLICY, ARBITRARY_UNIT, 0), | |
738 | /* non-hardware */ | |
739 | PRIMITIVE_INFO_INIT(AVERAGE_POWER, 0, 0, 0, POWER_UNIT, | |
740 | RAPL_PRIMITIVE_DERIVED), | |
741 | {NULL, 0, 0, 0}, | |
742 | }; | |
743 | ||
744 | /* Read primitive data based on its related struct rapl_primitive_info. | |
745 | * if xlate flag is set, return translated data based on data units, i.e. | |
746 | * time, energy, and power. | |
747 | * RAPL MSRs are non-architectual and are laid out not consistently across | |
748 | * domains. Here we use primitive info to allow writing consolidated access | |
749 | * functions. | |
750 | * For a given primitive, it is processed by MSR mask and shift. Unit conversion | |
751 | * is pre-assigned based on RAPL unit MSRs read at init time. | |
752 | * 63-------------------------- 31--------------------------- 0 | |
753 | * | xxxxx (mask) | | |
754 | * | |<- shift ----------------| | |
755 | * 63-------------------------- 31--------------------------- 0 | |
756 | */ | |
757 | static int rapl_read_data_raw(struct rapl_domain *rd, | |
758 | enum rapl_primitives prim, | |
759 | bool xlate, u64 *data) | |
760 | { | |
761 | u64 value, final; | |
762 | u32 msr; | |
763 | struct rapl_primitive_info *rp = &rpi[prim]; | |
764 | int cpu; | |
765 | ||
766 | if (!rp->name || rp->flag & RAPL_PRIMITIVE_DUMMY) | |
767 | return -EINVAL; | |
768 | ||
769 | msr = rd->msrs[rp->id]; | |
770 | if (!msr) | |
771 | return -EINVAL; | |
772 | /* use physical package id to look up active cpus */ | |
773 | cpu = find_active_cpu_on_package(rd->package_id); | |
774 | if (cpu < 0) | |
775 | return cpu; | |
776 | ||
777 | /* special-case package domain, which uses a different bit*/ | |
778 | if (prim == FW_LOCK && rd->id == RAPL_DOMAIN_PACKAGE) { | |
779 | rp->mask = POWER_PACKAGE_LOCK; | |
780 | rp->shift = 63; | |
781 | } | |
782 | /* non-hardware data are collected by the polling thread */ | |
783 | if (rp->flag & RAPL_PRIMITIVE_DERIVED) { | |
784 | *data = rd->rdd.primitives[prim]; | |
785 | return 0; | |
786 | } | |
787 | ||
788 | if (rdmsrl_safe_on_cpu(cpu, msr, &value)) { | |
789 | pr_debug("failed to read msr 0x%x on cpu %d\n", msr, cpu); | |
790 | return -EIO; | |
791 | } | |
792 | ||
793 | final = value & rp->mask; | |
794 | final = final >> rp->shift; | |
795 | if (xlate) | |
d474a4d3 | 796 | *data = rapl_unit_xlate(rd, rd->package_id, rp->unit, final, 0); |
2d281d81 JP |
797 | else |
798 | *data = final; | |
799 | ||
800 | return 0; | |
801 | } | |
802 | ||
803 | /* Similar use of primitive info in the read counterpart */ | |
804 | static int rapl_write_data_raw(struct rapl_domain *rd, | |
805 | enum rapl_primitives prim, | |
806 | unsigned long long value) | |
807 | { | |
808 | u64 msr_val; | |
809 | u32 msr; | |
810 | struct rapl_primitive_info *rp = &rpi[prim]; | |
811 | int cpu; | |
812 | ||
813 | cpu = find_active_cpu_on_package(rd->package_id); | |
814 | if (cpu < 0) | |
815 | return cpu; | |
816 | msr = rd->msrs[rp->id]; | |
817 | if (rdmsrl_safe_on_cpu(cpu, msr, &msr_val)) { | |
818 | dev_dbg(&rd->power_zone.dev, | |
819 | "failed to read msr 0x%x on cpu %d\n", msr, cpu); | |
820 | return -EIO; | |
821 | } | |
d474a4d3 | 822 | value = rapl_unit_xlate(rd, rd->package_id, rp->unit, value, 1); |
2d281d81 JP |
823 | msr_val &= ~rp->mask; |
824 | msr_val |= value << rp->shift; | |
825 | if (wrmsrl_safe_on_cpu(cpu, msr, msr_val)) { | |
826 | dev_dbg(&rd->power_zone.dev, | |
827 | "failed to write msr 0x%x on cpu %d\n", msr, cpu); | |
828 | return -EIO; | |
829 | } | |
830 | ||
831 | return 0; | |
832 | } | |
833 | ||
3c2c0845 JP |
834 | /* |
835 | * Raw RAPL data stored in MSRs are in certain scales. We need to | |
836 | * convert them into standard units based on the units reported in | |
837 | * the RAPL unit MSRs. This is specific to CPUs as the method to | |
838 | * calculate units differ on different CPUs. | |
839 | * We convert the units to below format based on CPUs. | |
840 | * i.e. | |
d474a4d3 | 841 | * energy unit: picoJoules : Represented in picoJoules by default |
3c2c0845 JP |
842 | * power unit : microWatts : Represented in milliWatts by default |
843 | * time unit : microseconds: Represented in seconds by default | |
844 | */ | |
845 | static int rapl_check_unit_core(struct rapl_package *rp, int cpu) | |
2d281d81 JP |
846 | { |
847 | u64 msr_val; | |
848 | u32 value; | |
849 | ||
850 | if (rdmsrl_safe_on_cpu(cpu, MSR_RAPL_POWER_UNIT, &msr_val)) { | |
851 | pr_err("Failed to read power unit MSR 0x%x on CPU %d, exit.\n", | |
852 | MSR_RAPL_POWER_UNIT, cpu); | |
853 | return -ENODEV; | |
854 | } | |
855 | ||
2d281d81 | 856 | value = (msr_val & ENERGY_UNIT_MASK) >> ENERGY_UNIT_OFFSET; |
d474a4d3 | 857 | rp->energy_unit = ENERGY_UNIT_SCALE * 1000000 / (1 << value); |
2d281d81 JP |
858 | |
859 | value = (msr_val & POWER_UNIT_MASK) >> POWER_UNIT_OFFSET; | |
3c2c0845 | 860 | rp->power_unit = 1000000 / (1 << value); |
2d281d81 JP |
861 | |
862 | value = (msr_val & TIME_UNIT_MASK) >> TIME_UNIT_OFFSET; | |
3c2c0845 | 863 | rp->time_unit = 1000000 / (1 << value); |
2d281d81 | 864 | |
d474a4d3 | 865 | pr_debug("Core CPU package %d energy=%dpJ, time=%dus, power=%duW\n", |
3c2c0845 | 866 | rp->id, rp->energy_unit, rp->time_unit, rp->power_unit); |
2d281d81 JP |
867 | |
868 | return 0; | |
869 | } | |
870 | ||
3c2c0845 JP |
871 | static int rapl_check_unit_atom(struct rapl_package *rp, int cpu) |
872 | { | |
873 | u64 msr_val; | |
874 | u32 value; | |
875 | ||
876 | if (rdmsrl_safe_on_cpu(cpu, MSR_RAPL_POWER_UNIT, &msr_val)) { | |
877 | pr_err("Failed to read power unit MSR 0x%x on CPU %d, exit.\n", | |
878 | MSR_RAPL_POWER_UNIT, cpu); | |
879 | return -ENODEV; | |
880 | } | |
881 | value = (msr_val & ENERGY_UNIT_MASK) >> ENERGY_UNIT_OFFSET; | |
d474a4d3 | 882 | rp->energy_unit = ENERGY_UNIT_SCALE * 1 << value; |
3c2c0845 JP |
883 | |
884 | value = (msr_val & POWER_UNIT_MASK) >> POWER_UNIT_OFFSET; | |
885 | rp->power_unit = (1 << value) * 1000; | |
886 | ||
887 | value = (msr_val & TIME_UNIT_MASK) >> TIME_UNIT_OFFSET; | |
888 | rp->time_unit = 1000000 / (1 << value); | |
889 | ||
d474a4d3 | 890 | pr_debug("Atom package %d energy=%dpJ, time=%dus, power=%duW\n", |
3c2c0845 JP |
891 | rp->id, rp->energy_unit, rp->time_unit, rp->power_unit); |
892 | ||
893 | return 0; | |
894 | } | |
895 | ||
896 | ||
2d281d81 JP |
897 | /* REVISIT: |
898 | * When package power limit is set artificially low by RAPL, LVT | |
899 | * thermal interrupt for package power limit should be ignored | |
900 | * since we are not really exceeding the real limit. The intention | |
901 | * is to avoid excessive interrupts while we are trying to save power. | |
902 | * A useful feature might be routing the package_power_limit interrupt | |
903 | * to userspace via eventfd. once we have a usecase, this is simple | |
904 | * to do by adding an atomic notifier. | |
905 | */ | |
906 | ||
907 | static void package_power_limit_irq_save(int package_id) | |
908 | { | |
909 | u32 l, h = 0; | |
910 | int cpu; | |
911 | struct rapl_package *rp; | |
912 | ||
913 | rp = find_package_by_id(package_id); | |
914 | if (!rp) | |
915 | return; | |
916 | ||
917 | if (!boot_cpu_has(X86_FEATURE_PTS) || !boot_cpu_has(X86_FEATURE_PLN)) | |
918 | return; | |
919 | ||
920 | cpu = find_active_cpu_on_package(package_id); | |
921 | if (cpu < 0) | |
922 | return; | |
923 | /* save the state of PLN irq mask bit before disabling it */ | |
924 | rdmsr_safe_on_cpu(cpu, MSR_IA32_PACKAGE_THERM_INTERRUPT, &l, &h); | |
925 | if (!(rp->power_limit_irq & PACKAGE_PLN_INT_SAVED)) { | |
926 | rp->power_limit_irq = l & PACKAGE_THERM_INT_PLN_ENABLE; | |
927 | rp->power_limit_irq |= PACKAGE_PLN_INT_SAVED; | |
928 | } | |
929 | l &= ~PACKAGE_THERM_INT_PLN_ENABLE; | |
930 | wrmsr_on_cpu(cpu, MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h); | |
931 | } | |
932 | ||
933 | /* restore per package power limit interrupt enable state */ | |
934 | static void package_power_limit_irq_restore(int package_id) | |
935 | { | |
936 | u32 l, h; | |
937 | int cpu; | |
938 | struct rapl_package *rp; | |
939 | ||
940 | rp = find_package_by_id(package_id); | |
941 | if (!rp) | |
942 | return; | |
943 | ||
944 | if (!boot_cpu_has(X86_FEATURE_PTS) || !boot_cpu_has(X86_FEATURE_PLN)) | |
945 | return; | |
946 | ||
947 | cpu = find_active_cpu_on_package(package_id); | |
948 | if (cpu < 0) | |
949 | return; | |
950 | ||
951 | /* irq enable state not saved, nothing to restore */ | |
952 | if (!(rp->power_limit_irq & PACKAGE_PLN_INT_SAVED)) | |
953 | return; | |
954 | rdmsr_safe_on_cpu(cpu, MSR_IA32_PACKAGE_THERM_INTERRUPT, &l, &h); | |
955 | ||
956 | if (rp->power_limit_irq & PACKAGE_THERM_INT_PLN_ENABLE) | |
957 | l |= PACKAGE_THERM_INT_PLN_ENABLE; | |
958 | else | |
959 | l &= ~PACKAGE_THERM_INT_PLN_ENABLE; | |
960 | ||
961 | wrmsr_on_cpu(cpu, MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h); | |
962 | } | |
963 | ||
3c2c0845 JP |
964 | static void set_floor_freq_default(struct rapl_domain *rd, bool mode) |
965 | { | |
966 | int nr_powerlimit = find_nr_power_limit(rd); | |
967 | ||
968 | /* always enable clamp such that p-state can go below OS requested | |
969 | * range. power capping priority over guranteed frequency. | |
970 | */ | |
971 | rapl_write_data_raw(rd, PL1_CLAMP, mode); | |
972 | ||
973 | /* some domains have pl2 */ | |
974 | if (nr_powerlimit > 1) { | |
975 | rapl_write_data_raw(rd, PL2_ENABLE, mode); | |
976 | rapl_write_data_raw(rd, PL2_CLAMP, mode); | |
977 | } | |
978 | } | |
979 | ||
980 | static void set_floor_freq_atom(struct rapl_domain *rd, bool enable) | |
981 | { | |
982 | static u32 power_ctrl_orig_val; | |
983 | u32 mdata; | |
984 | ||
51b63409 AT |
985 | if (!rapl_defaults->floor_freq_reg_addr) { |
986 | pr_err("Invalid floor frequency config register\n"); | |
987 | return; | |
988 | } | |
989 | ||
3c2c0845 | 990 | if (!power_ctrl_orig_val) |
4077a387 AS |
991 | iosf_mbi_read(BT_MBI_UNIT_PMC, MBI_CR_READ, |
992 | rapl_defaults->floor_freq_reg_addr, | |
993 | &power_ctrl_orig_val); | |
3c2c0845 JP |
994 | mdata = power_ctrl_orig_val; |
995 | if (enable) { | |
996 | mdata &= ~(0x7f << 8); | |
997 | mdata |= 1 << 8; | |
998 | } | |
4077a387 AS |
999 | iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_CR_WRITE, |
1000 | rapl_defaults->floor_freq_reg_addr, mdata); | |
3c2c0845 JP |
1001 | } |
1002 | ||
1003 | static u64 rapl_compute_time_window_core(struct rapl_package *rp, u64 value, | |
1004 | bool to_raw) | |
1005 | { | |
1006 | u64 f, y; /* fraction and exp. used for time unit */ | |
1007 | ||
1008 | /* | |
1009 | * Special processing based on 2^Y*(1+F/4), refer | |
1010 | * to Intel Software Developer's manual Vol.3B: CH 14.9.3. | |
1011 | */ | |
1012 | if (!to_raw) { | |
1013 | f = (value & 0x60) >> 5; | |
1014 | y = value & 0x1f; | |
1015 | value = (1 << y) * (4 + f) * rp->time_unit / 4; | |
1016 | } else { | |
1017 | do_div(value, rp->time_unit); | |
1018 | y = ilog2(value); | |
1019 | f = div64_u64(4 * (value - (1 << y)), 1 << y); | |
1020 | value = (y & 0x1f) | ((f & 0x3) << 5); | |
1021 | } | |
1022 | return value; | |
1023 | } | |
1024 | ||
1025 | static u64 rapl_compute_time_window_atom(struct rapl_package *rp, u64 value, | |
1026 | bool to_raw) | |
1027 | { | |
1028 | /* | |
1029 | * Atom time unit encoding is straight forward val * time_unit, | |
1030 | * where time_unit is default to 1 sec. Never 0. | |
1031 | */ | |
1032 | if (!to_raw) | |
1033 | return (value) ? value *= rp->time_unit : rp->time_unit; | |
1034 | else | |
1035 | value = div64_u64(value, rp->time_unit); | |
1036 | ||
1037 | return value; | |
1038 | } | |
1039 | ||
087e9cba | 1040 | static const struct rapl_defaults rapl_defaults_core = { |
51b63409 | 1041 | .floor_freq_reg_addr = 0, |
3c2c0845 JP |
1042 | .check_unit = rapl_check_unit_core, |
1043 | .set_floor_freq = set_floor_freq_default, | |
1044 | .compute_time_window = rapl_compute_time_window_core, | |
087e9cba JP |
1045 | }; |
1046 | ||
d474a4d3 JP |
1047 | static const struct rapl_defaults rapl_defaults_hsw_server = { |
1048 | .check_unit = rapl_check_unit_core, | |
1049 | .set_floor_freq = set_floor_freq_default, | |
1050 | .compute_time_window = rapl_compute_time_window_core, | |
1051 | .dram_domain_energy_unit = 15300, | |
1052 | }; | |
1053 | ||
51b63409 AT |
1054 | static const struct rapl_defaults rapl_defaults_byt = { |
1055 | .floor_freq_reg_addr = IOSF_CPU_POWER_BUDGET_CTL_BYT, | |
1056 | .check_unit = rapl_check_unit_atom, | |
1057 | .set_floor_freq = set_floor_freq_atom, | |
1058 | .compute_time_window = rapl_compute_time_window_atom, | |
1059 | }; | |
1060 | ||
1061 | static const struct rapl_defaults rapl_defaults_tng = { | |
1062 | .floor_freq_reg_addr = IOSF_CPU_POWER_BUDGET_CTL_TNG, | |
3c2c0845 JP |
1063 | .check_unit = rapl_check_unit_atom, |
1064 | .set_floor_freq = set_floor_freq_atom, | |
1065 | .compute_time_window = rapl_compute_time_window_atom, | |
087e9cba JP |
1066 | }; |
1067 | ||
51b63409 AT |
1068 | static const struct rapl_defaults rapl_defaults_ann = { |
1069 | .floor_freq_reg_addr = 0, | |
1070 | .check_unit = rapl_check_unit_atom, | |
1071 | .set_floor_freq = NULL, | |
1072 | .compute_time_window = rapl_compute_time_window_atom, | |
1073 | }; | |
1074 | ||
1075 | static const struct rapl_defaults rapl_defaults_cht = { | |
1076 | .floor_freq_reg_addr = 0, | |
1077 | .check_unit = rapl_check_unit_atom, | |
1078 | .set_floor_freq = NULL, | |
1079 | .compute_time_window = rapl_compute_time_window_atom, | |
1080 | }; | |
1081 | ||
087e9cba JP |
1082 | #define RAPL_CPU(_model, _ops) { \ |
1083 | .vendor = X86_VENDOR_INTEL, \ | |
1084 | .family = 6, \ | |
1085 | .model = _model, \ | |
1086 | .driver_data = (kernel_ulong_t)&_ops, \ | |
1087 | } | |
1088 | ||
ea85dbca | 1089 | static const struct x86_cpu_id rapl_ids[] __initconst = { |
087e9cba JP |
1090 | RAPL_CPU(0x2a, rapl_defaults_core),/* Sandy Bridge */ |
1091 | RAPL_CPU(0x2d, rapl_defaults_core),/* Sandy Bridge EP */ | |
51b63409 | 1092 | RAPL_CPU(0x37, rapl_defaults_byt),/* Valleyview */ |
087e9cba JP |
1093 | RAPL_CPU(0x3a, rapl_defaults_core),/* Ivy Bridge */ |
1094 | RAPL_CPU(0x3c, rapl_defaults_core),/* Haswell */ | |
1095 | RAPL_CPU(0x3d, rapl_defaults_core),/* Broadwell */ | |
d474a4d3 | 1096 | RAPL_CPU(0x3f, rapl_defaults_hsw_server),/* Haswell servers */ |
34dfa36c | 1097 | RAPL_CPU(0x4f, rapl_defaults_hsw_server),/* Broadwell servers */ |
087e9cba | 1098 | RAPL_CPU(0x45, rapl_defaults_core),/* Haswell ULT */ |
4e0bec9e | 1099 | RAPL_CPU(0x47, rapl_defaults_core),/* Broadwell-H */ |
5fa0fa4b | 1100 | RAPL_CPU(0x4E, rapl_defaults_core),/* Skylake */ |
51b63409 AT |
1101 | RAPL_CPU(0x4C, rapl_defaults_cht),/* Braswell/Cherryview */ |
1102 | RAPL_CPU(0x4A, rapl_defaults_tng),/* Tangier */ | |
d72be771 | 1103 | RAPL_CPU(0x56, rapl_defaults_core),/* Future Xeon */ |
51b63409 | 1104 | RAPL_CPU(0x5A, rapl_defaults_ann),/* Annidale */ |
89e7b255 | 1105 | RAPL_CPU(0X5C, rapl_defaults_core),/* Broxton */ |
2cac1f70 | 1106 | RAPL_CPU(0x5E, rapl_defaults_core),/* Skylake-H/S */ |
6f066d4d | 1107 | RAPL_CPU(0x57, rapl_defaults_hsw_server),/* Knights Landing */ |
2d281d81 JP |
1108 | {} |
1109 | }; | |
1110 | MODULE_DEVICE_TABLE(x86cpu, rapl_ids); | |
1111 | ||
1112 | /* read once for all raw primitive data for all packages, domains */ | |
1113 | static void rapl_update_domain_data(void) | |
1114 | { | |
1115 | int dmn, prim; | |
1116 | u64 val; | |
1117 | struct rapl_package *rp; | |
1118 | ||
1119 | list_for_each_entry(rp, &rapl_packages, plist) { | |
1120 | for (dmn = 0; dmn < rp->nr_domains; dmn++) { | |
1121 | pr_debug("update package %d domain %s data\n", rp->id, | |
1122 | rp->domains[dmn].name); | |
1123 | /* exclude non-raw primitives */ | |
1124 | for (prim = 0; prim < NR_RAW_PRIMITIVES; prim++) | |
1125 | if (!rapl_read_data_raw(&rp->domains[dmn], prim, | |
1126 | rpi[prim].unit, | |
1127 | &val)) | |
1128 | rp->domains[dmn].rdd.primitives[prim] = | |
1129 | val; | |
1130 | } | |
1131 | } | |
1132 | ||
1133 | } | |
1134 | ||
1135 | static int rapl_unregister_powercap(void) | |
1136 | { | |
1137 | struct rapl_package *rp; | |
1138 | struct rapl_domain *rd, *rd_package = NULL; | |
1139 | ||
1140 | /* unregister all active rapl packages from the powercap layer, | |
1141 | * hotplug lock held | |
1142 | */ | |
1143 | list_for_each_entry(rp, &rapl_packages, plist) { | |
1144 | package_power_limit_irq_restore(rp->id); | |
1145 | ||
1146 | for (rd = rp->domains; rd < rp->domains + rp->nr_domains; | |
1147 | rd++) { | |
1148 | pr_debug("remove package, undo power limit on %d: %s\n", | |
1149 | rp->id, rd->name); | |
1150 | rapl_write_data_raw(rd, PL1_ENABLE, 0); | |
2d281d81 | 1151 | rapl_write_data_raw(rd, PL1_CLAMP, 0); |
5021282c SI |
1152 | if (find_nr_power_limit(rd) > 1) { |
1153 | rapl_write_data_raw(rd, PL2_ENABLE, 0); | |
1154 | rapl_write_data_raw(rd, PL2_CLAMP, 0); | |
1155 | } | |
2d281d81 JP |
1156 | if (rd->id == RAPL_DOMAIN_PACKAGE) { |
1157 | rd_package = rd; | |
1158 | continue; | |
1159 | } | |
1160 | powercap_unregister_zone(control_type, &rd->power_zone); | |
1161 | } | |
1162 | /* do the package zone last */ | |
1163 | if (rd_package) | |
1164 | powercap_unregister_zone(control_type, | |
1165 | &rd_package->power_zone); | |
1166 | } | |
1167 | powercap_unregister_control_type(control_type); | |
1168 | ||
1169 | return 0; | |
1170 | } | |
1171 | ||
1172 | static int rapl_package_register_powercap(struct rapl_package *rp) | |
1173 | { | |
1174 | struct rapl_domain *rd; | |
1175 | int ret = 0; | |
1176 | char dev_name[17]; /* max domain name = 7 + 1 + 8 for int + 1 for null*/ | |
1177 | struct powercap_zone *power_zone = NULL; | |
1178 | int nr_pl; | |
1179 | ||
1180 | /* first we register package domain as the parent zone*/ | |
1181 | for (rd = rp->domains; rd < rp->domains + rp->nr_domains; rd++) { | |
1182 | if (rd->id == RAPL_DOMAIN_PACKAGE) { | |
1183 | nr_pl = find_nr_power_limit(rd); | |
1184 | pr_debug("register socket %d package domain %s\n", | |
1185 | rp->id, rd->name); | |
1186 | memset(dev_name, 0, sizeof(dev_name)); | |
1187 | snprintf(dev_name, sizeof(dev_name), "%s-%d", | |
1188 | rd->name, rp->id); | |
1189 | power_zone = powercap_register_zone(&rd->power_zone, | |
1190 | control_type, | |
1191 | dev_name, NULL, | |
1192 | &zone_ops[rd->id], | |
1193 | nr_pl, | |
1194 | &constraint_ops); | |
1195 | if (IS_ERR(power_zone)) { | |
1196 | pr_debug("failed to register package, %d\n", | |
1197 | rp->id); | |
1198 | ret = PTR_ERR(power_zone); | |
1199 | goto exit_package; | |
1200 | } | |
1201 | /* track parent zone in per package/socket data */ | |
1202 | rp->power_zone = power_zone; | |
1203 | /* done, only one package domain per socket */ | |
1204 | break; | |
1205 | } | |
1206 | } | |
1207 | if (!power_zone) { | |
1208 | pr_err("no package domain found, unknown topology!\n"); | |
1209 | ret = -ENODEV; | |
1210 | goto exit_package; | |
1211 | } | |
1212 | /* now register domains as children of the socket/package*/ | |
1213 | for (rd = rp->domains; rd < rp->domains + rp->nr_domains; rd++) { | |
1214 | if (rd->id == RAPL_DOMAIN_PACKAGE) | |
1215 | continue; | |
1216 | /* number of power limits per domain varies */ | |
1217 | nr_pl = find_nr_power_limit(rd); | |
1218 | power_zone = powercap_register_zone(&rd->power_zone, | |
1219 | control_type, rd->name, | |
1220 | rp->power_zone, | |
1221 | &zone_ops[rd->id], nr_pl, | |
1222 | &constraint_ops); | |
1223 | ||
1224 | if (IS_ERR(power_zone)) { | |
1225 | pr_debug("failed to register power_zone, %d:%s:%s\n", | |
1226 | rp->id, rd->name, dev_name); | |
1227 | ret = PTR_ERR(power_zone); | |
1228 | goto err_cleanup; | |
1229 | } | |
1230 | } | |
1231 | ||
1232 | exit_package: | |
1233 | return ret; | |
1234 | err_cleanup: | |
1235 | /* clean up previously initialized domains within the package if we | |
1236 | * failed after the first domain setup. | |
1237 | */ | |
1238 | while (--rd >= rp->domains) { | |
1239 | pr_debug("unregister package %d domain %s\n", rp->id, rd->name); | |
1240 | powercap_unregister_zone(control_type, &rd->power_zone); | |
1241 | } | |
1242 | ||
1243 | return ret; | |
1244 | } | |
1245 | ||
1246 | static int rapl_register_powercap(void) | |
1247 | { | |
1248 | struct rapl_domain *rd; | |
1249 | struct rapl_package *rp; | |
1250 | int ret = 0; | |
1251 | ||
1252 | control_type = powercap_register_control_type(NULL, "intel-rapl", NULL); | |
1253 | if (IS_ERR(control_type)) { | |
1254 | pr_debug("failed to register powercap control_type.\n"); | |
1255 | return PTR_ERR(control_type); | |
1256 | } | |
1257 | /* read the initial data */ | |
1258 | rapl_update_domain_data(); | |
1259 | list_for_each_entry(rp, &rapl_packages, plist) | |
1260 | if (rapl_package_register_powercap(rp)) | |
1261 | goto err_cleanup_package; | |
1262 | return ret; | |
1263 | ||
1264 | err_cleanup_package: | |
1265 | /* clean up previously initialized packages */ | |
1266 | list_for_each_entry_continue_reverse(rp, &rapl_packages, plist) { | |
1267 | for (rd = rp->domains; rd < rp->domains + rp->nr_domains; | |
1268 | rd++) { | |
1269 | pr_debug("unregister zone/package %d, %s domain\n", | |
1270 | rp->id, rd->name); | |
1271 | powercap_unregister_zone(control_type, &rd->power_zone); | |
1272 | } | |
1273 | } | |
1274 | ||
1275 | return ret; | |
1276 | } | |
1277 | ||
1278 | static int rapl_check_domain(int cpu, int domain) | |
1279 | { | |
1280 | unsigned msr; | |
9d31c676 | 1281 | u64 val = 0; |
2d281d81 JP |
1282 | |
1283 | switch (domain) { | |
1284 | case RAPL_DOMAIN_PACKAGE: | |
1285 | msr = MSR_PKG_ENERGY_STATUS; | |
1286 | break; | |
1287 | case RAPL_DOMAIN_PP0: | |
1288 | msr = MSR_PP0_ENERGY_STATUS; | |
1289 | break; | |
1290 | case RAPL_DOMAIN_PP1: | |
1291 | msr = MSR_PP1_ENERGY_STATUS; | |
1292 | break; | |
1293 | case RAPL_DOMAIN_DRAM: | |
1294 | msr = MSR_DRAM_ENERGY_STATUS; | |
1295 | break; | |
1296 | default: | |
1297 | pr_err("invalid domain id %d\n", domain); | |
1298 | return -EINVAL; | |
1299 | } | |
9d31c676 JP |
1300 | /* make sure domain counters are available and contains non-zero |
1301 | * values, otherwise skip it. | |
7b874772 | 1302 | */ |
9d31c676 JP |
1303 | if (rdmsrl_safe_on_cpu(cpu, msr, &val) || !val) |
1304 | return -ENODEV; | |
2d281d81 | 1305 | |
9d31c676 | 1306 | return 0; |
2d281d81 JP |
1307 | } |
1308 | ||
1309 | /* Detect active and valid domains for the given CPU, caller must | |
1310 | * ensure the CPU belongs to the targeted package and CPU hotlug is disabled. | |
1311 | */ | |
1312 | static int rapl_detect_domains(struct rapl_package *rp, int cpu) | |
1313 | { | |
1314 | int i; | |
1315 | int ret = 0; | |
1316 | struct rapl_domain *rd; | |
1317 | u64 locked; | |
1318 | ||
1319 | for (i = 0; i < RAPL_DOMAIN_MAX; i++) { | |
1320 | /* use physical package id to read counters */ | |
fcdf1797 | 1321 | if (!rapl_check_domain(cpu, i)) { |
2d281d81 | 1322 | rp->domain_map |= 1 << i; |
fcdf1797 JP |
1323 | pr_info("Found RAPL domain %s\n", rapl_domain_names[i]); |
1324 | } | |
2d281d81 JP |
1325 | } |
1326 | rp->nr_domains = bitmap_weight(&rp->domain_map, RAPL_DOMAIN_MAX); | |
1327 | if (!rp->nr_domains) { | |
1328 | pr_err("no valid rapl domains found in package %d\n", rp->id); | |
1329 | ret = -ENODEV; | |
1330 | goto done; | |
1331 | } | |
1332 | pr_debug("found %d domains on package %d\n", rp->nr_domains, rp->id); | |
1333 | ||
1334 | rp->domains = kcalloc(rp->nr_domains + 1, sizeof(struct rapl_domain), | |
1335 | GFP_KERNEL); | |
1336 | if (!rp->domains) { | |
1337 | ret = -ENOMEM; | |
1338 | goto done; | |
1339 | } | |
1340 | rapl_init_domains(rp); | |
1341 | ||
1342 | for (rd = rp->domains; rd < rp->domains + rp->nr_domains; rd++) { | |
1343 | /* check if the domain is locked by BIOS */ | |
79a21dbf PB |
1344 | ret = rapl_read_data_raw(rd, FW_LOCK, false, &locked); |
1345 | if (ret) | |
1346 | return ret; | |
1347 | if (locked) { | |
2d281d81 JP |
1348 | pr_info("RAPL package %d domain %s locked by BIOS\n", |
1349 | rp->id, rd->name); | |
79a21dbf | 1350 | rd->state |= DOMAIN_STATE_BIOS_LOCKED; |
2d281d81 JP |
1351 | } |
1352 | } | |
1353 | ||
1354 | ||
1355 | done: | |
1356 | return ret; | |
1357 | } | |
1358 | ||
1359 | static bool is_package_new(int package) | |
1360 | { | |
1361 | struct rapl_package *rp; | |
1362 | ||
1363 | /* caller prevents cpu hotplug, there will be no new packages added | |
1364 | * or deleted while traversing the package list, no need for locking. | |
1365 | */ | |
1366 | list_for_each_entry(rp, &rapl_packages, plist) | |
1367 | if (package == rp->id) | |
1368 | return false; | |
1369 | ||
1370 | return true; | |
1371 | } | |
1372 | ||
1373 | /* RAPL interface can be made of a two-level hierarchy: package level and domain | |
1374 | * level. We first detect the number of packages then domains of each package. | |
1375 | * We have to consider the possiblity of CPU online/offline due to hotplug and | |
1376 | * other scenarios. | |
1377 | */ | |
1378 | static int rapl_detect_topology(void) | |
1379 | { | |
1380 | int i; | |
1381 | int phy_package_id; | |
1382 | struct rapl_package *new_package, *rp; | |
1383 | ||
1384 | for_each_online_cpu(i) { | |
1385 | phy_package_id = topology_physical_package_id(i); | |
1386 | if (is_package_new(phy_package_id)) { | |
1387 | new_package = kzalloc(sizeof(*rp), GFP_KERNEL); | |
1388 | if (!new_package) { | |
1389 | rapl_cleanup_data(); | |
1390 | return -ENOMEM; | |
1391 | } | |
1392 | /* add the new package to the list */ | |
1393 | new_package->id = phy_package_id; | |
1394 | new_package->nr_cpus = 1; | |
1395 | ||
1396 | /* check if the package contains valid domains */ | |
1397 | if (rapl_detect_domains(new_package, i) || | |
3c2c0845 | 1398 | rapl_defaults->check_unit(new_package, i)) { |
2d281d81 JP |
1399 | kfree(new_package->domains); |
1400 | kfree(new_package); | |
1401 | /* free up the packages already initialized */ | |
1402 | rapl_cleanup_data(); | |
1403 | return -ENODEV; | |
1404 | } | |
1405 | INIT_LIST_HEAD(&new_package->plist); | |
1406 | list_add(&new_package->plist, &rapl_packages); | |
1407 | } else { | |
1408 | rp = find_package_by_id(phy_package_id); | |
1409 | if (rp) | |
1410 | ++rp->nr_cpus; | |
1411 | } | |
1412 | } | |
1413 | ||
1414 | return 0; | |
1415 | } | |
1416 | ||
1417 | /* called from CPU hotplug notifier, hotplug lock held */ | |
1418 | static void rapl_remove_package(struct rapl_package *rp) | |
1419 | { | |
1420 | struct rapl_domain *rd, *rd_package = NULL; | |
1421 | ||
1422 | for (rd = rp->domains; rd < rp->domains + rp->nr_domains; rd++) { | |
1423 | if (rd->id == RAPL_DOMAIN_PACKAGE) { | |
1424 | rd_package = rd; | |
1425 | continue; | |
1426 | } | |
1427 | pr_debug("remove package %d, %s domain\n", rp->id, rd->name); | |
1428 | powercap_unregister_zone(control_type, &rd->power_zone); | |
1429 | } | |
1430 | /* do parent zone last */ | |
1431 | powercap_unregister_zone(control_type, &rd_package->power_zone); | |
1432 | list_del(&rp->plist); | |
1433 | kfree(rp); | |
1434 | } | |
1435 | ||
1436 | /* called from CPU hotplug notifier, hotplug lock held */ | |
1437 | static int rapl_add_package(int cpu) | |
1438 | { | |
1439 | int ret = 0; | |
1440 | int phy_package_id; | |
1441 | struct rapl_package *rp; | |
1442 | ||
1443 | phy_package_id = topology_physical_package_id(cpu); | |
1444 | rp = kzalloc(sizeof(struct rapl_package), GFP_KERNEL); | |
1445 | if (!rp) | |
1446 | return -ENOMEM; | |
1447 | ||
1448 | /* add the new package to the list */ | |
1449 | rp->id = phy_package_id; | |
1450 | rp->nr_cpus = 1; | |
1451 | /* check if the package contains valid domains */ | |
1452 | if (rapl_detect_domains(rp, cpu) || | |
3c2c0845 | 1453 | rapl_defaults->check_unit(rp, cpu)) { |
2d281d81 JP |
1454 | ret = -ENODEV; |
1455 | goto err_free_package; | |
1456 | } | |
1457 | if (!rapl_package_register_powercap(rp)) { | |
1458 | INIT_LIST_HEAD(&rp->plist); | |
1459 | list_add(&rp->plist, &rapl_packages); | |
1460 | return ret; | |
1461 | } | |
1462 | ||
1463 | err_free_package: | |
1464 | kfree(rp->domains); | |
1465 | kfree(rp); | |
1466 | ||
1467 | return ret; | |
1468 | } | |
1469 | ||
1470 | /* Handles CPU hotplug on multi-socket systems. | |
1471 | * If a CPU goes online as the first CPU of the physical package | |
1472 | * we add the RAPL package to the system. Similarly, when the last | |
1473 | * CPU of the package is removed, we remove the RAPL package and its | |
1474 | * associated domains. Cooling devices are handled accordingly at | |
1475 | * per-domain level. | |
1476 | */ | |
1477 | static int rapl_cpu_callback(struct notifier_block *nfb, | |
1478 | unsigned long action, void *hcpu) | |
1479 | { | |
1480 | unsigned long cpu = (unsigned long)hcpu; | |
1481 | int phy_package_id; | |
1482 | struct rapl_package *rp; | |
1483 | ||
1484 | phy_package_id = topology_physical_package_id(cpu); | |
1485 | switch (action) { | |
1486 | case CPU_ONLINE: | |
1487 | case CPU_ONLINE_FROZEN: | |
1488 | case CPU_DOWN_FAILED: | |
1489 | case CPU_DOWN_FAILED_FROZEN: | |
1490 | rp = find_package_by_id(phy_package_id); | |
1491 | if (rp) | |
1492 | ++rp->nr_cpus; | |
1493 | else | |
1494 | rapl_add_package(cpu); | |
1495 | break; | |
1496 | case CPU_DOWN_PREPARE: | |
1497 | case CPU_DOWN_PREPARE_FROZEN: | |
1498 | rp = find_package_by_id(phy_package_id); | |
1499 | if (!rp) | |
1500 | break; | |
1501 | if (--rp->nr_cpus == 0) | |
1502 | rapl_remove_package(rp); | |
1503 | } | |
1504 | ||
1505 | return NOTIFY_OK; | |
1506 | } | |
1507 | ||
1508 | static struct notifier_block rapl_cpu_notifier = { | |
1509 | .notifier_call = rapl_cpu_callback, | |
1510 | }; | |
1511 | ||
1512 | static int __init rapl_init(void) | |
1513 | { | |
1514 | int ret = 0; | |
087e9cba | 1515 | const struct x86_cpu_id *id; |
2d281d81 | 1516 | |
087e9cba JP |
1517 | id = x86_match_cpu(rapl_ids); |
1518 | if (!id) { | |
2d281d81 JP |
1519 | pr_err("driver does not support CPU family %d model %d\n", |
1520 | boot_cpu_data.x86, boot_cpu_data.x86_model); | |
1521 | ||
1522 | return -ENODEV; | |
1523 | } | |
009f225e | 1524 | |
087e9cba JP |
1525 | rapl_defaults = (struct rapl_defaults *)id->driver_data; |
1526 | ||
009f225e SB |
1527 | cpu_notifier_register_begin(); |
1528 | ||
2d281d81 JP |
1529 | /* prevent CPU hotplug during detection */ |
1530 | get_online_cpus(); | |
1531 | ret = rapl_detect_topology(); | |
1532 | if (ret) | |
1533 | goto done; | |
1534 | ||
1535 | if (rapl_register_powercap()) { | |
1536 | rapl_cleanup_data(); | |
1537 | ret = -ENODEV; | |
1538 | goto done; | |
1539 | } | |
009f225e | 1540 | __register_hotcpu_notifier(&rapl_cpu_notifier); |
2d281d81 JP |
1541 | done: |
1542 | put_online_cpus(); | |
009f225e | 1543 | cpu_notifier_register_done(); |
2d281d81 JP |
1544 | |
1545 | return ret; | |
1546 | } | |
1547 | ||
1548 | static void __exit rapl_exit(void) | |
1549 | { | |
009f225e | 1550 | cpu_notifier_register_begin(); |
2d281d81 | 1551 | get_online_cpus(); |
009f225e | 1552 | __unregister_hotcpu_notifier(&rapl_cpu_notifier); |
2d281d81 JP |
1553 | rapl_unregister_powercap(); |
1554 | rapl_cleanup_data(); | |
1555 | put_online_cpus(); | |
009f225e | 1556 | cpu_notifier_register_done(); |
2d281d81 JP |
1557 | } |
1558 | ||
1559 | module_init(rapl_init); | |
1560 | module_exit(rapl_exit); | |
1561 | ||
1562 | MODULE_DESCRIPTION("Driver for Intel RAPL (Running Average Power Limit)"); | |
1563 | MODULE_AUTHOR("Jacob Pan <jacob.jun.pan@intel.com>"); | |
1564 | MODULE_LICENSE("GPL v2"); |