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93f0822d | 1 | /* |
d1b68485 | 2 | * intel_pstate.c: Native P state management for Intel processors |
93f0822d DB |
3 | * |
4 | * (C) Copyright 2012 Intel Corporation | |
5 | * Author: Dirk Brandewie <dirk.j.brandewie@intel.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; version 2 | |
10 | * of the License. | |
11 | */ | |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/kernel_stat.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/ktime.h> | |
17 | #include <linux/hrtimer.h> | |
18 | #include <linux/tick.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/sched.h> | |
21 | #include <linux/list.h> | |
22 | #include <linux/cpu.h> | |
23 | #include <linux/cpufreq.h> | |
24 | #include <linux/sysfs.h> | |
25 | #include <linux/types.h> | |
26 | #include <linux/fs.h> | |
27 | #include <linux/debugfs.h> | |
fbbcdc07 | 28 | #include <linux/acpi.h> |
93f0822d DB |
29 | #include <trace/events/power.h> |
30 | ||
31 | #include <asm/div64.h> | |
32 | #include <asm/msr.h> | |
33 | #include <asm/cpu_device_id.h> | |
34 | ||
61d8d2ab DB |
35 | #define BYT_RATIOS 0x66a |
36 | #define BYT_VIDS 0x66b | |
37 | #define BYT_TURBO_RATIOS 0x66c | |
38 | ||
19e77c28 | 39 | |
e66c1768 | 40 | #define FRAC_BITS 6 |
93f0822d DB |
41 | #define int_tofp(X) ((int64_t)(X) << FRAC_BITS) |
42 | #define fp_toint(X) ((X) >> FRAC_BITS) | |
e66c1768 | 43 | #define FP_ROUNDUP(X) ((X) += 1 << FRAC_BITS) |
93f0822d DB |
44 | |
45 | static inline int32_t mul_fp(int32_t x, int32_t y) | |
46 | { | |
47 | return ((int64_t)x * (int64_t)y) >> FRAC_BITS; | |
48 | } | |
49 | ||
50 | static inline int32_t div_fp(int32_t x, int32_t y) | |
51 | { | |
52 | return div_s64((int64_t)x << FRAC_BITS, (int64_t)y); | |
53 | } | |
54 | ||
55 | struct sample { | |
d253d2a5 | 56 | int32_t core_pct_busy; |
93f0822d DB |
57 | u64 aperf; |
58 | u64 mperf; | |
fcb6a15c | 59 | unsigned long long tsc; |
93f0822d DB |
60 | int freq; |
61 | }; | |
62 | ||
63 | struct pstate_data { | |
64 | int current_pstate; | |
65 | int min_pstate; | |
66 | int max_pstate; | |
67 | int turbo_pstate; | |
68 | }; | |
69 | ||
007bea09 DB |
70 | struct vid_data { |
71 | int32_t min; | |
72 | int32_t max; | |
73 | int32_t ratio; | |
74 | }; | |
75 | ||
93f0822d DB |
76 | struct _pid { |
77 | int setpoint; | |
78 | int32_t integral; | |
79 | int32_t p_gain; | |
80 | int32_t i_gain; | |
81 | int32_t d_gain; | |
82 | int deadband; | |
d253d2a5 | 83 | int32_t last_err; |
93f0822d DB |
84 | }; |
85 | ||
86 | struct cpudata { | |
87 | int cpu; | |
88 | ||
89 | char name[64]; | |
90 | ||
91 | struct timer_list timer; | |
92 | ||
93f0822d | 93 | struct pstate_data pstate; |
007bea09 | 94 | struct vid_data vid; |
93f0822d | 95 | struct _pid pid; |
93f0822d | 96 | |
93f0822d DB |
97 | u64 prev_aperf; |
98 | u64 prev_mperf; | |
fcb6a15c | 99 | unsigned long long prev_tsc; |
d37e2b76 | 100 | struct sample sample; |
93f0822d DB |
101 | }; |
102 | ||
103 | static struct cpudata **all_cpu_data; | |
104 | struct pstate_adjust_policy { | |
105 | int sample_rate_ms; | |
106 | int deadband; | |
107 | int setpoint; | |
108 | int p_gain_pct; | |
109 | int d_gain_pct; | |
110 | int i_gain_pct; | |
111 | }; | |
112 | ||
016c8150 DB |
113 | struct pstate_funcs { |
114 | int (*get_max)(void); | |
115 | int (*get_min)(void); | |
116 | int (*get_turbo)(void); | |
007bea09 DB |
117 | void (*set)(struct cpudata*, int pstate); |
118 | void (*get_vid)(struct cpudata *); | |
93f0822d DB |
119 | }; |
120 | ||
016c8150 DB |
121 | struct cpu_defaults { |
122 | struct pstate_adjust_policy pid_policy; | |
123 | struct pstate_funcs funcs; | |
93f0822d DB |
124 | }; |
125 | ||
016c8150 DB |
126 | static struct pstate_adjust_policy pid_params; |
127 | static struct pstate_funcs pstate_funcs; | |
128 | ||
93f0822d DB |
129 | struct perf_limits { |
130 | int no_turbo; | |
131 | int max_perf_pct; | |
132 | int min_perf_pct; | |
133 | int32_t max_perf; | |
134 | int32_t min_perf; | |
d8f469e9 DB |
135 | int max_policy_pct; |
136 | int max_sysfs_pct; | |
93f0822d DB |
137 | }; |
138 | ||
139 | static struct perf_limits limits = { | |
140 | .no_turbo = 0, | |
141 | .max_perf_pct = 100, | |
142 | .max_perf = int_tofp(1), | |
143 | .min_perf_pct = 0, | |
144 | .min_perf = 0, | |
d8f469e9 DB |
145 | .max_policy_pct = 100, |
146 | .max_sysfs_pct = 100, | |
93f0822d DB |
147 | }; |
148 | ||
149 | static inline void pid_reset(struct _pid *pid, int setpoint, int busy, | |
150 | int deadband, int integral) { | |
151 | pid->setpoint = setpoint; | |
152 | pid->deadband = deadband; | |
153 | pid->integral = int_tofp(integral); | |
d98d099b | 154 | pid->last_err = int_tofp(setpoint) - int_tofp(busy); |
93f0822d DB |
155 | } |
156 | ||
157 | static inline void pid_p_gain_set(struct _pid *pid, int percent) | |
158 | { | |
159 | pid->p_gain = div_fp(int_tofp(percent), int_tofp(100)); | |
160 | } | |
161 | ||
162 | static inline void pid_i_gain_set(struct _pid *pid, int percent) | |
163 | { | |
164 | pid->i_gain = div_fp(int_tofp(percent), int_tofp(100)); | |
165 | } | |
166 | ||
167 | static inline void pid_d_gain_set(struct _pid *pid, int percent) | |
168 | { | |
169 | ||
170 | pid->d_gain = div_fp(int_tofp(percent), int_tofp(100)); | |
171 | } | |
172 | ||
d253d2a5 | 173 | static signed int pid_calc(struct _pid *pid, int32_t busy) |
93f0822d | 174 | { |
d253d2a5 | 175 | signed int result; |
93f0822d DB |
176 | int32_t pterm, dterm, fp_error; |
177 | int32_t integral_limit; | |
178 | ||
d253d2a5 | 179 | fp_error = int_tofp(pid->setpoint) - busy; |
93f0822d | 180 | |
d253d2a5 | 181 | if (abs(fp_error) <= int_tofp(pid->deadband)) |
93f0822d DB |
182 | return 0; |
183 | ||
184 | pterm = mul_fp(pid->p_gain, fp_error); | |
185 | ||
186 | pid->integral += fp_error; | |
187 | ||
188 | /* limit the integral term */ | |
189 | integral_limit = int_tofp(30); | |
190 | if (pid->integral > integral_limit) | |
191 | pid->integral = integral_limit; | |
192 | if (pid->integral < -integral_limit) | |
193 | pid->integral = -integral_limit; | |
194 | ||
d253d2a5 BS |
195 | dterm = mul_fp(pid->d_gain, fp_error - pid->last_err); |
196 | pid->last_err = fp_error; | |
93f0822d DB |
197 | |
198 | result = pterm + mul_fp(pid->integral, pid->i_gain) + dterm; | |
199 | ||
200 | return (signed int)fp_toint(result); | |
201 | } | |
202 | ||
203 | static inline void intel_pstate_busy_pid_reset(struct cpudata *cpu) | |
204 | { | |
016c8150 DB |
205 | pid_p_gain_set(&cpu->pid, pid_params.p_gain_pct); |
206 | pid_d_gain_set(&cpu->pid, pid_params.d_gain_pct); | |
207 | pid_i_gain_set(&cpu->pid, pid_params.i_gain_pct); | |
93f0822d DB |
208 | |
209 | pid_reset(&cpu->pid, | |
016c8150 | 210 | pid_params.setpoint, |
93f0822d | 211 | 100, |
016c8150 | 212 | pid_params.deadband, |
93f0822d DB |
213 | 0); |
214 | } | |
215 | ||
93f0822d DB |
216 | static inline void intel_pstate_reset_all_pid(void) |
217 | { | |
218 | unsigned int cpu; | |
219 | for_each_online_cpu(cpu) { | |
220 | if (all_cpu_data[cpu]) | |
221 | intel_pstate_busy_pid_reset(all_cpu_data[cpu]); | |
222 | } | |
223 | } | |
224 | ||
225 | /************************** debugfs begin ************************/ | |
226 | static int pid_param_set(void *data, u64 val) | |
227 | { | |
228 | *(u32 *)data = val; | |
229 | intel_pstate_reset_all_pid(); | |
230 | return 0; | |
231 | } | |
232 | static int pid_param_get(void *data, u64 *val) | |
233 | { | |
234 | *val = *(u32 *)data; | |
235 | return 0; | |
236 | } | |
237 | DEFINE_SIMPLE_ATTRIBUTE(fops_pid_param, pid_param_get, | |
238 | pid_param_set, "%llu\n"); | |
239 | ||
240 | struct pid_param { | |
241 | char *name; | |
242 | void *value; | |
243 | }; | |
244 | ||
245 | static struct pid_param pid_files[] = { | |
016c8150 DB |
246 | {"sample_rate_ms", &pid_params.sample_rate_ms}, |
247 | {"d_gain_pct", &pid_params.d_gain_pct}, | |
248 | {"i_gain_pct", &pid_params.i_gain_pct}, | |
249 | {"deadband", &pid_params.deadband}, | |
250 | {"setpoint", &pid_params.setpoint}, | |
251 | {"p_gain_pct", &pid_params.p_gain_pct}, | |
93f0822d DB |
252 | {NULL, NULL} |
253 | }; | |
254 | ||
255 | static struct dentry *debugfs_parent; | |
256 | static void intel_pstate_debug_expose_params(void) | |
257 | { | |
258 | int i = 0; | |
259 | ||
260 | debugfs_parent = debugfs_create_dir("pstate_snb", NULL); | |
261 | if (IS_ERR_OR_NULL(debugfs_parent)) | |
262 | return; | |
263 | while (pid_files[i].name) { | |
264 | debugfs_create_file(pid_files[i].name, 0660, | |
265 | debugfs_parent, pid_files[i].value, | |
266 | &fops_pid_param); | |
267 | i++; | |
268 | } | |
269 | } | |
270 | ||
271 | /************************** debugfs end ************************/ | |
272 | ||
273 | /************************** sysfs begin ************************/ | |
274 | #define show_one(file_name, object) \ | |
275 | static ssize_t show_##file_name \ | |
276 | (struct kobject *kobj, struct attribute *attr, char *buf) \ | |
277 | { \ | |
278 | return sprintf(buf, "%u\n", limits.object); \ | |
279 | } | |
280 | ||
281 | static ssize_t store_no_turbo(struct kobject *a, struct attribute *b, | |
282 | const char *buf, size_t count) | |
283 | { | |
284 | unsigned int input; | |
285 | int ret; | |
286 | ret = sscanf(buf, "%u", &input); | |
287 | if (ret != 1) | |
288 | return -EINVAL; | |
289 | limits.no_turbo = clamp_t(int, input, 0 , 1); | |
290 | ||
291 | return count; | |
292 | } | |
293 | ||
294 | static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b, | |
295 | const char *buf, size_t count) | |
296 | { | |
297 | unsigned int input; | |
298 | int ret; | |
299 | ret = sscanf(buf, "%u", &input); | |
300 | if (ret != 1) | |
301 | return -EINVAL; | |
302 | ||
d8f469e9 DB |
303 | limits.max_sysfs_pct = clamp_t(int, input, 0 , 100); |
304 | limits.max_perf_pct = min(limits.max_policy_pct, limits.max_sysfs_pct); | |
93f0822d DB |
305 | limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100)); |
306 | return count; | |
307 | } | |
308 | ||
309 | static ssize_t store_min_perf_pct(struct kobject *a, struct attribute *b, | |
310 | const char *buf, size_t count) | |
311 | { | |
312 | unsigned int input; | |
313 | int ret; | |
314 | ret = sscanf(buf, "%u", &input); | |
315 | if (ret != 1) | |
316 | return -EINVAL; | |
317 | limits.min_perf_pct = clamp_t(int, input, 0 , 100); | |
318 | limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100)); | |
319 | ||
320 | return count; | |
321 | } | |
322 | ||
323 | show_one(no_turbo, no_turbo); | |
324 | show_one(max_perf_pct, max_perf_pct); | |
325 | show_one(min_perf_pct, min_perf_pct); | |
326 | ||
327 | define_one_global_rw(no_turbo); | |
328 | define_one_global_rw(max_perf_pct); | |
329 | define_one_global_rw(min_perf_pct); | |
330 | ||
331 | static struct attribute *intel_pstate_attributes[] = { | |
332 | &no_turbo.attr, | |
333 | &max_perf_pct.attr, | |
334 | &min_perf_pct.attr, | |
335 | NULL | |
336 | }; | |
337 | ||
338 | static struct attribute_group intel_pstate_attr_group = { | |
339 | .attrs = intel_pstate_attributes, | |
340 | }; | |
341 | static struct kobject *intel_pstate_kobject; | |
342 | ||
343 | static void intel_pstate_sysfs_expose_params(void) | |
344 | { | |
345 | int rc; | |
346 | ||
347 | intel_pstate_kobject = kobject_create_and_add("intel_pstate", | |
348 | &cpu_subsys.dev_root->kobj); | |
349 | BUG_ON(!intel_pstate_kobject); | |
350 | rc = sysfs_create_group(intel_pstate_kobject, | |
351 | &intel_pstate_attr_group); | |
352 | BUG_ON(rc); | |
353 | } | |
354 | ||
355 | /************************** sysfs end ************************/ | |
19e77c28 DB |
356 | static int byt_get_min_pstate(void) |
357 | { | |
358 | u64 value; | |
359 | rdmsrl(BYT_RATIOS, value); | |
4042e757 | 360 | return (value >> 8) & 0xFF; |
19e77c28 DB |
361 | } |
362 | ||
363 | static int byt_get_max_pstate(void) | |
364 | { | |
365 | u64 value; | |
366 | rdmsrl(BYT_RATIOS, value); | |
367 | return (value >> 16) & 0xFF; | |
368 | } | |
93f0822d | 369 | |
61d8d2ab DB |
370 | static int byt_get_turbo_pstate(void) |
371 | { | |
372 | u64 value; | |
373 | rdmsrl(BYT_TURBO_RATIOS, value); | |
374 | return value & 0x3F; | |
375 | } | |
376 | ||
007bea09 DB |
377 | static void byt_set_pstate(struct cpudata *cpudata, int pstate) |
378 | { | |
379 | u64 val; | |
380 | int32_t vid_fp; | |
381 | u32 vid; | |
382 | ||
383 | val = pstate << 8; | |
384 | if (limits.no_turbo) | |
385 | val |= (u64)1 << 32; | |
386 | ||
387 | vid_fp = cpudata->vid.min + mul_fp( | |
388 | int_tofp(pstate - cpudata->pstate.min_pstate), | |
389 | cpudata->vid.ratio); | |
390 | ||
391 | vid_fp = clamp_t(int32_t, vid_fp, cpudata->vid.min, cpudata->vid.max); | |
392 | vid = fp_toint(vid_fp); | |
393 | ||
394 | val |= vid; | |
395 | ||
396 | wrmsrl(MSR_IA32_PERF_CTL, val); | |
397 | } | |
398 | ||
399 | static void byt_get_vid(struct cpudata *cpudata) | |
400 | { | |
401 | u64 value; | |
402 | ||
403 | rdmsrl(BYT_VIDS, value); | |
404 | cpudata->vid.min = int_tofp((value >> 8) & 0x7f); | |
405 | cpudata->vid.max = int_tofp((value >> 16) & 0x7f); | |
406 | cpudata->vid.ratio = div_fp( | |
407 | cpudata->vid.max - cpudata->vid.min, | |
408 | int_tofp(cpudata->pstate.max_pstate - | |
409 | cpudata->pstate.min_pstate)); | |
410 | } | |
411 | ||
412 | ||
016c8150 | 413 | static int core_get_min_pstate(void) |
93f0822d DB |
414 | { |
415 | u64 value; | |
05e99c8c | 416 | rdmsrl(MSR_PLATFORM_INFO, value); |
93f0822d DB |
417 | return (value >> 40) & 0xFF; |
418 | } | |
419 | ||
016c8150 | 420 | static int core_get_max_pstate(void) |
93f0822d DB |
421 | { |
422 | u64 value; | |
05e99c8c | 423 | rdmsrl(MSR_PLATFORM_INFO, value); |
93f0822d DB |
424 | return (value >> 8) & 0xFF; |
425 | } | |
426 | ||
016c8150 | 427 | static int core_get_turbo_pstate(void) |
93f0822d DB |
428 | { |
429 | u64 value; | |
430 | int nont, ret; | |
05e99c8c | 431 | rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT, value); |
016c8150 | 432 | nont = core_get_max_pstate(); |
93f0822d DB |
433 | ret = ((value) & 255); |
434 | if (ret <= nont) | |
435 | ret = nont; | |
436 | return ret; | |
437 | } | |
438 | ||
007bea09 | 439 | static void core_set_pstate(struct cpudata *cpudata, int pstate) |
016c8150 DB |
440 | { |
441 | u64 val; | |
442 | ||
443 | val = pstate << 8; | |
444 | if (limits.no_turbo) | |
445 | val |= (u64)1 << 32; | |
446 | ||
bb18008f | 447 | wrmsrl_on_cpu(cpudata->cpu, MSR_IA32_PERF_CTL, val); |
016c8150 DB |
448 | } |
449 | ||
450 | static struct cpu_defaults core_params = { | |
451 | .pid_policy = { | |
452 | .sample_rate_ms = 10, | |
453 | .deadband = 0, | |
454 | .setpoint = 97, | |
455 | .p_gain_pct = 20, | |
456 | .d_gain_pct = 0, | |
457 | .i_gain_pct = 0, | |
458 | }, | |
459 | .funcs = { | |
460 | .get_max = core_get_max_pstate, | |
461 | .get_min = core_get_min_pstate, | |
462 | .get_turbo = core_get_turbo_pstate, | |
463 | .set = core_set_pstate, | |
464 | }, | |
465 | }; | |
466 | ||
19e77c28 DB |
467 | static struct cpu_defaults byt_params = { |
468 | .pid_policy = { | |
469 | .sample_rate_ms = 10, | |
470 | .deadband = 0, | |
471 | .setpoint = 97, | |
472 | .p_gain_pct = 14, | |
473 | .d_gain_pct = 0, | |
474 | .i_gain_pct = 4, | |
475 | }, | |
476 | .funcs = { | |
477 | .get_max = byt_get_max_pstate, | |
478 | .get_min = byt_get_min_pstate, | |
61d8d2ab | 479 | .get_turbo = byt_get_turbo_pstate, |
007bea09 DB |
480 | .set = byt_set_pstate, |
481 | .get_vid = byt_get_vid, | |
19e77c28 DB |
482 | }, |
483 | }; | |
484 | ||
485 | ||
93f0822d DB |
486 | static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max) |
487 | { | |
488 | int max_perf = cpu->pstate.turbo_pstate; | |
7244cb62 | 489 | int max_perf_adj; |
93f0822d DB |
490 | int min_perf; |
491 | if (limits.no_turbo) | |
492 | max_perf = cpu->pstate.max_pstate; | |
493 | ||
7244cb62 DB |
494 | max_perf_adj = fp_toint(mul_fp(int_tofp(max_perf), limits.max_perf)); |
495 | *max = clamp_t(int, max_perf_adj, | |
93f0822d DB |
496 | cpu->pstate.min_pstate, cpu->pstate.turbo_pstate); |
497 | ||
498 | min_perf = fp_toint(mul_fp(int_tofp(max_perf), limits.min_perf)); | |
499 | *min = clamp_t(int, min_perf, | |
500 | cpu->pstate.min_pstate, max_perf); | |
501 | } | |
502 | ||
503 | static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate) | |
504 | { | |
505 | int max_perf, min_perf; | |
506 | ||
507 | intel_pstate_get_min_max(cpu, &min_perf, &max_perf); | |
508 | ||
509 | pstate = clamp_t(int, pstate, min_perf, max_perf); | |
510 | ||
511 | if (pstate == cpu->pstate.current_pstate) | |
512 | return; | |
513 | ||
93f0822d | 514 | trace_cpu_frequency(pstate * 100000, cpu->cpu); |
35363e94 | 515 | |
93f0822d | 516 | cpu->pstate.current_pstate = pstate; |
93f0822d | 517 | |
007bea09 | 518 | pstate_funcs.set(cpu, pstate); |
93f0822d DB |
519 | } |
520 | ||
521 | static inline void intel_pstate_pstate_increase(struct cpudata *cpu, int steps) | |
522 | { | |
523 | int target; | |
524 | target = cpu->pstate.current_pstate + steps; | |
525 | ||
526 | intel_pstate_set_pstate(cpu, target); | |
527 | } | |
528 | ||
529 | static inline void intel_pstate_pstate_decrease(struct cpudata *cpu, int steps) | |
530 | { | |
531 | int target; | |
532 | target = cpu->pstate.current_pstate - steps; | |
533 | intel_pstate_set_pstate(cpu, target); | |
534 | } | |
535 | ||
536 | static void intel_pstate_get_cpu_pstates(struct cpudata *cpu) | |
537 | { | |
538 | sprintf(cpu->name, "Intel 2nd generation core"); | |
539 | ||
016c8150 DB |
540 | cpu->pstate.min_pstate = pstate_funcs.get_min(); |
541 | cpu->pstate.max_pstate = pstate_funcs.get_max(); | |
542 | cpu->pstate.turbo_pstate = pstate_funcs.get_turbo(); | |
93f0822d | 543 | |
007bea09 DB |
544 | if (pstate_funcs.get_vid) |
545 | pstate_funcs.get_vid(cpu); | |
546 | ||
93f0822d DB |
547 | /* |
548 | * goto max pstate so we don't slow up boot if we are built-in if we are | |
549 | * a module we will take care of it during normal operation | |
550 | */ | |
551 | intel_pstate_set_pstate(cpu, cpu->pstate.max_pstate); | |
552 | } | |
553 | ||
6b17ddb2 | 554 | static inline void intel_pstate_calc_busy(struct cpudata *cpu) |
93f0822d | 555 | { |
6b17ddb2 | 556 | struct sample *sample = &cpu->sample; |
e66c1768 DB |
557 | int32_t core_pct; |
558 | int32_t c0_pct; | |
93f0822d | 559 | |
6b17ddb2 | 560 | core_pct = div_fp(int_tofp(sample->aperf), int_tofp(sample->mperf)); |
e66c1768 DB |
561 | core_pct = mul_fp(core_pct, int_tofp(100)); |
562 | FP_ROUNDUP(core_pct); | |
563 | ||
564 | c0_pct = div_fp(int_tofp(sample->mperf), int_tofp(sample->tsc)); | |
fcb6a15c | 565 | |
fcb6a15c | 566 | sample->freq = fp_toint( |
e66c1768 | 567 | mul_fp(int_tofp(cpu->pstate.max_pstate * 1000), core_pct)); |
fcb6a15c | 568 | |
e66c1768 | 569 | sample->core_pct_busy = mul_fp(core_pct, c0_pct); |
93f0822d DB |
570 | } |
571 | ||
572 | static inline void intel_pstate_sample(struct cpudata *cpu) | |
573 | { | |
93f0822d | 574 | u64 aperf, mperf; |
fcb6a15c | 575 | unsigned long long tsc; |
93f0822d | 576 | |
93f0822d DB |
577 | rdmsrl(MSR_IA32_APERF, aperf); |
578 | rdmsrl(MSR_IA32_MPERF, mperf); | |
fcb6a15c | 579 | tsc = native_read_tsc(); |
b69880f9 | 580 | |
e66c1768 DB |
581 | aperf = aperf >> FRAC_BITS; |
582 | mperf = mperf >> FRAC_BITS; | |
583 | tsc = tsc >> FRAC_BITS; | |
584 | ||
d37e2b76 DB |
585 | cpu->sample.aperf = aperf; |
586 | cpu->sample.mperf = mperf; | |
587 | cpu->sample.tsc = tsc; | |
588 | cpu->sample.aperf -= cpu->prev_aperf; | |
589 | cpu->sample.mperf -= cpu->prev_mperf; | |
590 | cpu->sample.tsc -= cpu->prev_tsc; | |
1abc4b20 | 591 | |
6b17ddb2 | 592 | intel_pstate_calc_busy(cpu); |
93f0822d | 593 | |
93f0822d DB |
594 | cpu->prev_aperf = aperf; |
595 | cpu->prev_mperf = mperf; | |
fcb6a15c | 596 | cpu->prev_tsc = tsc; |
93f0822d DB |
597 | } |
598 | ||
599 | static inline void intel_pstate_set_sample_time(struct cpudata *cpu) | |
600 | { | |
601 | int sample_time, delay; | |
602 | ||
016c8150 | 603 | sample_time = pid_params.sample_rate_ms; |
93f0822d | 604 | delay = msecs_to_jiffies(sample_time); |
93f0822d DB |
605 | mod_timer_pinned(&cpu->timer, jiffies + delay); |
606 | } | |
607 | ||
d253d2a5 | 608 | static inline int32_t intel_pstate_get_scaled_busy(struct cpudata *cpu) |
93f0822d | 609 | { |
2134ed4d | 610 | int32_t core_busy, max_pstate, current_pstate; |
93f0822d | 611 | |
d37e2b76 | 612 | core_busy = cpu->sample.core_pct_busy; |
2134ed4d | 613 | max_pstate = int_tofp(cpu->pstate.max_pstate); |
93f0822d | 614 | current_pstate = int_tofp(cpu->pstate.current_pstate); |
e66c1768 DB |
615 | core_busy = mul_fp(core_busy, div_fp(max_pstate, current_pstate)); |
616 | return FP_ROUNDUP(core_busy); | |
93f0822d DB |
617 | } |
618 | ||
619 | static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu) | |
620 | { | |
d253d2a5 | 621 | int32_t busy_scaled; |
93f0822d DB |
622 | struct _pid *pid; |
623 | signed int ctl = 0; | |
624 | int steps; | |
625 | ||
626 | pid = &cpu->pid; | |
627 | busy_scaled = intel_pstate_get_scaled_busy(cpu); | |
628 | ||
629 | ctl = pid_calc(pid, busy_scaled); | |
630 | ||
631 | steps = abs(ctl); | |
b69880f9 | 632 | |
93f0822d DB |
633 | if (ctl < 0) |
634 | intel_pstate_pstate_increase(cpu, steps); | |
635 | else | |
636 | intel_pstate_pstate_decrease(cpu, steps); | |
637 | } | |
638 | ||
93f0822d DB |
639 | static void intel_pstate_timer_func(unsigned long __data) |
640 | { | |
641 | struct cpudata *cpu = (struct cpudata *) __data; | |
b69880f9 | 642 | struct sample *sample; |
93f0822d DB |
643 | |
644 | intel_pstate_sample(cpu); | |
b69880f9 | 645 | |
d37e2b76 | 646 | sample = &cpu->sample; |
b69880f9 | 647 | |
ca182aee | 648 | intel_pstate_adjust_busy_pstate(cpu); |
b69880f9 DB |
649 | |
650 | trace_pstate_sample(fp_toint(sample->core_pct_busy), | |
651 | fp_toint(intel_pstate_get_scaled_busy(cpu)), | |
652 | cpu->pstate.current_pstate, | |
653 | sample->mperf, | |
654 | sample->aperf, | |
b69880f9 DB |
655 | sample->freq); |
656 | ||
93f0822d DB |
657 | intel_pstate_set_sample_time(cpu); |
658 | } | |
659 | ||
660 | #define ICPU(model, policy) \ | |
6cbd7ee1 DB |
661 | { X86_VENDOR_INTEL, 6, model, X86_FEATURE_APERFMPERF,\ |
662 | (unsigned long)&policy } | |
93f0822d DB |
663 | |
664 | static const struct x86_cpu_id intel_pstate_cpu_ids[] = { | |
016c8150 DB |
665 | ICPU(0x2a, core_params), |
666 | ICPU(0x2d, core_params), | |
19e77c28 | 667 | ICPU(0x37, byt_params), |
016c8150 DB |
668 | ICPU(0x3a, core_params), |
669 | ICPU(0x3c, core_params), | |
670 | ICPU(0x3e, core_params), | |
671 | ICPU(0x3f, core_params), | |
672 | ICPU(0x45, core_params), | |
673 | ICPU(0x46, core_params), | |
93f0822d DB |
674 | {} |
675 | }; | |
676 | MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids); | |
677 | ||
678 | static int intel_pstate_init_cpu(unsigned int cpunum) | |
679 | { | |
680 | ||
681 | const struct x86_cpu_id *id; | |
682 | struct cpudata *cpu; | |
683 | ||
684 | id = x86_match_cpu(intel_pstate_cpu_ids); | |
685 | if (!id) | |
686 | return -ENODEV; | |
687 | ||
688 | all_cpu_data[cpunum] = kzalloc(sizeof(struct cpudata), GFP_KERNEL); | |
689 | if (!all_cpu_data[cpunum]) | |
690 | return -ENOMEM; | |
691 | ||
692 | cpu = all_cpu_data[cpunum]; | |
693 | ||
694 | intel_pstate_get_cpu_pstates(cpu); | |
98a947ab RW |
695 | if (!cpu->pstate.current_pstate) { |
696 | all_cpu_data[cpunum] = NULL; | |
697 | kfree(cpu); | |
698 | return -ENODATA; | |
699 | } | |
93f0822d DB |
700 | |
701 | cpu->cpu = cpunum; | |
016c8150 | 702 | |
93f0822d DB |
703 | init_timer_deferrable(&cpu->timer); |
704 | cpu->timer.function = intel_pstate_timer_func; | |
705 | cpu->timer.data = | |
706 | (unsigned long)cpu; | |
707 | cpu->timer.expires = jiffies + HZ/100; | |
708 | intel_pstate_busy_pid_reset(cpu); | |
93f0822d DB |
709 | intel_pstate_sample(cpu); |
710 | intel_pstate_set_pstate(cpu, cpu->pstate.max_pstate); | |
711 | ||
712 | add_timer_on(&cpu->timer, cpunum); | |
713 | ||
714 | pr_info("Intel pstate controlling: cpu %d\n", cpunum); | |
715 | ||
716 | return 0; | |
717 | } | |
718 | ||
719 | static unsigned int intel_pstate_get(unsigned int cpu_num) | |
720 | { | |
721 | struct sample *sample; | |
722 | struct cpudata *cpu; | |
723 | ||
724 | cpu = all_cpu_data[cpu_num]; | |
725 | if (!cpu) | |
726 | return 0; | |
d37e2b76 | 727 | sample = &cpu->sample; |
93f0822d DB |
728 | return sample->freq; |
729 | } | |
730 | ||
731 | static int intel_pstate_set_policy(struct cpufreq_policy *policy) | |
732 | { | |
733 | struct cpudata *cpu; | |
93f0822d DB |
734 | |
735 | cpu = all_cpu_data[policy->cpu]; | |
736 | ||
d3929b83 DB |
737 | if (!policy->cpuinfo.max_freq) |
738 | return -ENODEV; | |
739 | ||
93f0822d DB |
740 | if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) { |
741 | limits.min_perf_pct = 100; | |
742 | limits.min_perf = int_tofp(1); | |
743 | limits.max_perf_pct = 100; | |
744 | limits.max_perf = int_tofp(1); | |
745 | limits.no_turbo = 0; | |
d1b68485 | 746 | return 0; |
93f0822d | 747 | } |
d1b68485 SP |
748 | limits.min_perf_pct = (policy->min * 100) / policy->cpuinfo.max_freq; |
749 | limits.min_perf_pct = clamp_t(int, limits.min_perf_pct, 0 , 100); | |
750 | limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100)); | |
751 | ||
d8f469e9 DB |
752 | limits.max_policy_pct = policy->max * 100 / policy->cpuinfo.max_freq; |
753 | limits.max_policy_pct = clamp_t(int, limits.max_policy_pct, 0 , 100); | |
754 | limits.max_perf_pct = min(limits.max_policy_pct, limits.max_sysfs_pct); | |
d1b68485 | 755 | limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100)); |
93f0822d DB |
756 | |
757 | return 0; | |
758 | } | |
759 | ||
760 | static int intel_pstate_verify_policy(struct cpufreq_policy *policy) | |
761 | { | |
be49e346 | 762 | cpufreq_verify_within_cpu_limits(policy); |
93f0822d DB |
763 | |
764 | if ((policy->policy != CPUFREQ_POLICY_POWERSAVE) && | |
765 | (policy->policy != CPUFREQ_POLICY_PERFORMANCE)) | |
766 | return -EINVAL; | |
767 | ||
768 | return 0; | |
769 | } | |
770 | ||
bb18008f | 771 | static void intel_pstate_stop_cpu(struct cpufreq_policy *policy) |
93f0822d | 772 | { |
bb18008f DB |
773 | int cpu_num = policy->cpu; |
774 | struct cpudata *cpu = all_cpu_data[cpu_num]; | |
93f0822d | 775 | |
bb18008f DB |
776 | pr_info("intel_pstate CPU %d exiting\n", cpu_num); |
777 | ||
c2294a2f | 778 | del_timer_sync(&all_cpu_data[cpu_num]->timer); |
bb18008f DB |
779 | intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate); |
780 | kfree(all_cpu_data[cpu_num]); | |
781 | all_cpu_data[cpu_num] = NULL; | |
93f0822d DB |
782 | } |
783 | ||
2760984f | 784 | static int intel_pstate_cpu_init(struct cpufreq_policy *policy) |
93f0822d | 785 | { |
93f0822d | 786 | struct cpudata *cpu; |
52e0a509 | 787 | int rc; |
93f0822d DB |
788 | |
789 | rc = intel_pstate_init_cpu(policy->cpu); | |
790 | if (rc) | |
791 | return rc; | |
792 | ||
793 | cpu = all_cpu_data[policy->cpu]; | |
794 | ||
795 | if (!limits.no_turbo && | |
796 | limits.min_perf_pct == 100 && limits.max_perf_pct == 100) | |
797 | policy->policy = CPUFREQ_POLICY_PERFORMANCE; | |
798 | else | |
799 | policy->policy = CPUFREQ_POLICY_POWERSAVE; | |
800 | ||
52e0a509 DB |
801 | policy->min = cpu->pstate.min_pstate * 100000; |
802 | policy->max = cpu->pstate.turbo_pstate * 100000; | |
93f0822d DB |
803 | |
804 | /* cpuinfo and default policy values */ | |
805 | policy->cpuinfo.min_freq = cpu->pstate.min_pstate * 100000; | |
806 | policy->cpuinfo.max_freq = cpu->pstate.turbo_pstate * 100000; | |
807 | policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL; | |
808 | cpumask_set_cpu(policy->cpu, policy->cpus); | |
809 | ||
810 | return 0; | |
811 | } | |
812 | ||
813 | static struct cpufreq_driver intel_pstate_driver = { | |
814 | .flags = CPUFREQ_CONST_LOOPS, | |
815 | .verify = intel_pstate_verify_policy, | |
816 | .setpolicy = intel_pstate_set_policy, | |
817 | .get = intel_pstate_get, | |
818 | .init = intel_pstate_cpu_init, | |
bb18008f | 819 | .stop_cpu = intel_pstate_stop_cpu, |
93f0822d | 820 | .name = "intel_pstate", |
93f0822d DB |
821 | }; |
822 | ||
6be26498 DB |
823 | static int __initdata no_load; |
824 | ||
b563b4e3 DB |
825 | static int intel_pstate_msrs_not_valid(void) |
826 | { | |
827 | /* Check that all the msr's we are using are valid. */ | |
828 | u64 aperf, mperf, tmp; | |
829 | ||
830 | rdmsrl(MSR_IA32_APERF, aperf); | |
831 | rdmsrl(MSR_IA32_MPERF, mperf); | |
832 | ||
016c8150 DB |
833 | if (!pstate_funcs.get_max() || |
834 | !pstate_funcs.get_min() || | |
835 | !pstate_funcs.get_turbo()) | |
b563b4e3 DB |
836 | return -ENODEV; |
837 | ||
838 | rdmsrl(MSR_IA32_APERF, tmp); | |
839 | if (!(tmp - aperf)) | |
840 | return -ENODEV; | |
841 | ||
842 | rdmsrl(MSR_IA32_MPERF, tmp); | |
843 | if (!(tmp - mperf)) | |
844 | return -ENODEV; | |
845 | ||
846 | return 0; | |
847 | } | |
016c8150 | 848 | |
e0a261a2 | 849 | static void copy_pid_params(struct pstate_adjust_policy *policy) |
016c8150 DB |
850 | { |
851 | pid_params.sample_rate_ms = policy->sample_rate_ms; | |
852 | pid_params.p_gain_pct = policy->p_gain_pct; | |
853 | pid_params.i_gain_pct = policy->i_gain_pct; | |
854 | pid_params.d_gain_pct = policy->d_gain_pct; | |
855 | pid_params.deadband = policy->deadband; | |
856 | pid_params.setpoint = policy->setpoint; | |
857 | } | |
858 | ||
e0a261a2 | 859 | static void copy_cpu_funcs(struct pstate_funcs *funcs) |
016c8150 DB |
860 | { |
861 | pstate_funcs.get_max = funcs->get_max; | |
862 | pstate_funcs.get_min = funcs->get_min; | |
863 | pstate_funcs.get_turbo = funcs->get_turbo; | |
864 | pstate_funcs.set = funcs->set; | |
007bea09 | 865 | pstate_funcs.get_vid = funcs->get_vid; |
016c8150 DB |
866 | } |
867 | ||
fbbcdc07 AH |
868 | #if IS_ENABLED(CONFIG_ACPI) |
869 | #include <acpi/processor.h> | |
870 | ||
871 | static bool intel_pstate_no_acpi_pss(void) | |
872 | { | |
873 | int i; | |
874 | ||
875 | for_each_possible_cpu(i) { | |
876 | acpi_status status; | |
877 | union acpi_object *pss; | |
878 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
879 | struct acpi_processor *pr = per_cpu(processors, i); | |
880 | ||
881 | if (!pr) | |
882 | continue; | |
883 | ||
884 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); | |
885 | if (ACPI_FAILURE(status)) | |
886 | continue; | |
887 | ||
888 | pss = buffer.pointer; | |
889 | if (pss && pss->type == ACPI_TYPE_PACKAGE) { | |
890 | kfree(pss); | |
891 | return false; | |
892 | } | |
893 | ||
894 | kfree(pss); | |
895 | } | |
896 | ||
897 | return true; | |
898 | } | |
899 | ||
900 | struct hw_vendor_info { | |
901 | u16 valid; | |
902 | char oem_id[ACPI_OEM_ID_SIZE]; | |
903 | char oem_table_id[ACPI_OEM_TABLE_ID_SIZE]; | |
904 | }; | |
905 | ||
906 | /* Hardware vendor-specific info that has its own power management modes */ | |
907 | static struct hw_vendor_info vendor_info[] = { | |
908 | {1, "HP ", "ProLiant"}, | |
909 | {0, "", ""}, | |
910 | }; | |
911 | ||
912 | static bool intel_pstate_platform_pwr_mgmt_exists(void) | |
913 | { | |
914 | struct acpi_table_header hdr; | |
915 | struct hw_vendor_info *v_info; | |
916 | ||
917 | if (acpi_disabled | |
918 | || ACPI_FAILURE(acpi_get_table_header(ACPI_SIG_FADT, 0, &hdr))) | |
919 | return false; | |
920 | ||
921 | for (v_info = vendor_info; v_info->valid; v_info++) { | |
922 | if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) | |
923 | && !strncmp(hdr.oem_table_id, v_info->oem_table_id, ACPI_OEM_TABLE_ID_SIZE) | |
924 | && intel_pstate_no_acpi_pss()) | |
925 | return true; | |
926 | } | |
927 | ||
928 | return false; | |
929 | } | |
930 | #else /* CONFIG_ACPI not enabled */ | |
931 | static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; } | |
932 | #endif /* CONFIG_ACPI */ | |
933 | ||
93f0822d DB |
934 | static int __init intel_pstate_init(void) |
935 | { | |
907cc908 | 936 | int cpu, rc = 0; |
93f0822d | 937 | const struct x86_cpu_id *id; |
016c8150 | 938 | struct cpu_defaults *cpu_info; |
93f0822d | 939 | |
6be26498 DB |
940 | if (no_load) |
941 | return -ENODEV; | |
942 | ||
93f0822d DB |
943 | id = x86_match_cpu(intel_pstate_cpu_ids); |
944 | if (!id) | |
945 | return -ENODEV; | |
946 | ||
fbbcdc07 AH |
947 | /* |
948 | * The Intel pstate driver will be ignored if the platform | |
949 | * firmware has its own power management modes. | |
950 | */ | |
951 | if (intel_pstate_platform_pwr_mgmt_exists()) | |
952 | return -ENODEV; | |
953 | ||
016c8150 DB |
954 | cpu_info = (struct cpu_defaults *)id->driver_data; |
955 | ||
956 | copy_pid_params(&cpu_info->pid_policy); | |
957 | copy_cpu_funcs(&cpu_info->funcs); | |
958 | ||
b563b4e3 DB |
959 | if (intel_pstate_msrs_not_valid()) |
960 | return -ENODEV; | |
961 | ||
93f0822d DB |
962 | pr_info("Intel P-state driver initializing.\n"); |
963 | ||
b57ffac5 | 964 | all_cpu_data = vzalloc(sizeof(void *) * num_possible_cpus()); |
93f0822d DB |
965 | if (!all_cpu_data) |
966 | return -ENOMEM; | |
93f0822d DB |
967 | |
968 | rc = cpufreq_register_driver(&intel_pstate_driver); | |
969 | if (rc) | |
970 | goto out; | |
971 | ||
972 | intel_pstate_debug_expose_params(); | |
973 | intel_pstate_sysfs_expose_params(); | |
b69880f9 | 974 | |
93f0822d DB |
975 | return rc; |
976 | out: | |
907cc908 DB |
977 | get_online_cpus(); |
978 | for_each_online_cpu(cpu) { | |
979 | if (all_cpu_data[cpu]) { | |
980 | del_timer_sync(&all_cpu_data[cpu]->timer); | |
981 | kfree(all_cpu_data[cpu]); | |
982 | } | |
983 | } | |
984 | ||
985 | put_online_cpus(); | |
986 | vfree(all_cpu_data); | |
93f0822d DB |
987 | return -ENODEV; |
988 | } | |
989 | device_initcall(intel_pstate_init); | |
990 | ||
6be26498 DB |
991 | static int __init intel_pstate_setup(char *str) |
992 | { | |
993 | if (!str) | |
994 | return -EINVAL; | |
995 | ||
996 | if (!strcmp(str, "disable")) | |
997 | no_load = 1; | |
998 | return 0; | |
999 | } | |
1000 | early_param("intel_pstate", intel_pstate_setup); | |
1001 | ||
93f0822d DB |
1002 | MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>"); |
1003 | MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors"); | |
1004 | MODULE_LICENSE("GPL"); |