Commit | Line | Data |
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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 | |
21855ff5 | 38 | #define BYT_TURBO_VIDS 0x66d |
61d8d2ab | 39 | |
19e77c28 | 40 | |
f0fe3cd7 | 41 | #define FRAC_BITS 8 |
93f0822d DB |
42 | #define int_tofp(X) ((int64_t)(X) << FRAC_BITS) |
43 | #define fp_toint(X) ((X) >> FRAC_BITS) | |
f0fe3cd7 | 44 | |
93f0822d DB |
45 | |
46 | static inline int32_t mul_fp(int32_t x, int32_t y) | |
47 | { | |
48 | return ((int64_t)x * (int64_t)y) >> FRAC_BITS; | |
49 | } | |
50 | ||
51 | static inline int32_t div_fp(int32_t x, int32_t y) | |
52 | { | |
53 | return div_s64((int64_t)x << FRAC_BITS, (int64_t)y); | |
54 | } | |
55 | ||
56 | struct sample { | |
d253d2a5 | 57 | int32_t core_pct_busy; |
93f0822d DB |
58 | u64 aperf; |
59 | u64 mperf; | |
60 | int freq; | |
c4ee841f | 61 | ktime_t time; |
93f0822d DB |
62 | }; |
63 | ||
64 | struct pstate_data { | |
65 | int current_pstate; | |
66 | int min_pstate; | |
67 | int max_pstate; | |
68 | int turbo_pstate; | |
69 | }; | |
70 | ||
007bea09 | 71 | struct vid_data { |
21855ff5 DB |
72 | int min; |
73 | int max; | |
74 | int turbo; | |
007bea09 DB |
75 | int32_t ratio; |
76 | }; | |
77 | ||
93f0822d DB |
78 | struct _pid { |
79 | int setpoint; | |
80 | int32_t integral; | |
81 | int32_t p_gain; | |
82 | int32_t i_gain; | |
83 | int32_t d_gain; | |
84 | int deadband; | |
d253d2a5 | 85 | int32_t last_err; |
93f0822d DB |
86 | }; |
87 | ||
88 | struct cpudata { | |
89 | int cpu; | |
90 | ||
93f0822d DB |
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 | |
c4ee841f | 97 | ktime_t last_sample_time; |
93f0822d DB |
98 | u64 prev_aperf; |
99 | u64 prev_mperf; | |
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; | |
51d211e9 | 199 | result = result + (1 << (FRAC_BITS-1)); |
93f0822d DB |
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); | |
21855ff5 | 360 | return (value >> 8) & 0x3F; |
19e77c28 DB |
361 | } |
362 | ||
363 | static int byt_get_max_pstate(void) | |
364 | { | |
365 | u64 value; | |
366 | rdmsrl(BYT_RATIOS, value); | |
21855ff5 | 367 | return (value >> 16) & 0x3F; |
19e77c28 | 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 | ||
21855ff5 DB |
394 | if (pstate > cpudata->pstate.max_pstate) |
395 | vid = cpudata->vid.turbo; | |
396 | ||
007bea09 DB |
397 | val |= vid; |
398 | ||
399 | wrmsrl(MSR_IA32_PERF_CTL, val); | |
400 | } | |
401 | ||
402 | static void byt_get_vid(struct cpudata *cpudata) | |
403 | { | |
404 | u64 value; | |
405 | ||
21855ff5 | 406 | |
007bea09 | 407 | rdmsrl(BYT_VIDS, value); |
21855ff5 DB |
408 | cpudata->vid.min = int_tofp((value >> 8) & 0x3f); |
409 | cpudata->vid.max = int_tofp((value >> 16) & 0x3f); | |
007bea09 DB |
410 | cpudata->vid.ratio = div_fp( |
411 | cpudata->vid.max - cpudata->vid.min, | |
412 | int_tofp(cpudata->pstate.max_pstate - | |
413 | cpudata->pstate.min_pstate)); | |
21855ff5 DB |
414 | |
415 | rdmsrl(BYT_TURBO_VIDS, value); | |
416 | cpudata->vid.turbo = value & 0x7f; | |
007bea09 DB |
417 | } |
418 | ||
419 | ||
016c8150 | 420 | static int core_get_min_pstate(void) |
93f0822d DB |
421 | { |
422 | u64 value; | |
05e99c8c | 423 | rdmsrl(MSR_PLATFORM_INFO, value); |
93f0822d DB |
424 | return (value >> 40) & 0xFF; |
425 | } | |
426 | ||
016c8150 | 427 | static int core_get_max_pstate(void) |
93f0822d DB |
428 | { |
429 | u64 value; | |
05e99c8c | 430 | rdmsrl(MSR_PLATFORM_INFO, value); |
93f0822d DB |
431 | return (value >> 8) & 0xFF; |
432 | } | |
433 | ||
016c8150 | 434 | static int core_get_turbo_pstate(void) |
93f0822d DB |
435 | { |
436 | u64 value; | |
437 | int nont, ret; | |
05e99c8c | 438 | rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT, value); |
016c8150 | 439 | nont = core_get_max_pstate(); |
93f0822d DB |
440 | ret = ((value) & 255); |
441 | if (ret <= nont) | |
442 | ret = nont; | |
443 | return ret; | |
444 | } | |
445 | ||
007bea09 | 446 | static void core_set_pstate(struct cpudata *cpudata, int pstate) |
016c8150 DB |
447 | { |
448 | u64 val; | |
449 | ||
450 | val = pstate << 8; | |
451 | if (limits.no_turbo) | |
452 | val |= (u64)1 << 32; | |
453 | ||
bb18008f | 454 | wrmsrl_on_cpu(cpudata->cpu, MSR_IA32_PERF_CTL, val); |
016c8150 DB |
455 | } |
456 | ||
457 | static struct cpu_defaults core_params = { | |
458 | .pid_policy = { | |
459 | .sample_rate_ms = 10, | |
460 | .deadband = 0, | |
461 | .setpoint = 97, | |
462 | .p_gain_pct = 20, | |
463 | .d_gain_pct = 0, | |
464 | .i_gain_pct = 0, | |
465 | }, | |
466 | .funcs = { | |
467 | .get_max = core_get_max_pstate, | |
468 | .get_min = core_get_min_pstate, | |
469 | .get_turbo = core_get_turbo_pstate, | |
470 | .set = core_set_pstate, | |
471 | }, | |
472 | }; | |
473 | ||
19e77c28 DB |
474 | static struct cpu_defaults byt_params = { |
475 | .pid_policy = { | |
476 | .sample_rate_ms = 10, | |
477 | .deadband = 0, | |
478 | .setpoint = 97, | |
479 | .p_gain_pct = 14, | |
480 | .d_gain_pct = 0, | |
481 | .i_gain_pct = 4, | |
482 | }, | |
483 | .funcs = { | |
484 | .get_max = byt_get_max_pstate, | |
485 | .get_min = byt_get_min_pstate, | |
61d8d2ab | 486 | .get_turbo = byt_get_turbo_pstate, |
007bea09 DB |
487 | .set = byt_set_pstate, |
488 | .get_vid = byt_get_vid, | |
19e77c28 DB |
489 | }, |
490 | }; | |
491 | ||
492 | ||
93f0822d DB |
493 | static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max) |
494 | { | |
495 | int max_perf = cpu->pstate.turbo_pstate; | |
7244cb62 | 496 | int max_perf_adj; |
93f0822d DB |
497 | int min_perf; |
498 | if (limits.no_turbo) | |
499 | max_perf = cpu->pstate.max_pstate; | |
500 | ||
7244cb62 DB |
501 | max_perf_adj = fp_toint(mul_fp(int_tofp(max_perf), limits.max_perf)); |
502 | *max = clamp_t(int, max_perf_adj, | |
93f0822d DB |
503 | cpu->pstate.min_pstate, cpu->pstate.turbo_pstate); |
504 | ||
505 | min_perf = fp_toint(mul_fp(int_tofp(max_perf), limits.min_perf)); | |
506 | *min = clamp_t(int, min_perf, | |
507 | cpu->pstate.min_pstate, max_perf); | |
508 | } | |
509 | ||
510 | static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate) | |
511 | { | |
512 | int max_perf, min_perf; | |
513 | ||
514 | intel_pstate_get_min_max(cpu, &min_perf, &max_perf); | |
515 | ||
516 | pstate = clamp_t(int, pstate, min_perf, max_perf); | |
517 | ||
518 | if (pstate == cpu->pstate.current_pstate) | |
519 | return; | |
520 | ||
93f0822d | 521 | trace_cpu_frequency(pstate * 100000, cpu->cpu); |
35363e94 | 522 | |
93f0822d | 523 | cpu->pstate.current_pstate = pstate; |
93f0822d | 524 | |
007bea09 | 525 | pstate_funcs.set(cpu, pstate); |
93f0822d DB |
526 | } |
527 | ||
528 | static inline void intel_pstate_pstate_increase(struct cpudata *cpu, int steps) | |
529 | { | |
530 | int target; | |
531 | target = cpu->pstate.current_pstate + steps; | |
532 | ||
533 | intel_pstate_set_pstate(cpu, target); | |
534 | } | |
535 | ||
536 | static inline void intel_pstate_pstate_decrease(struct cpudata *cpu, int steps) | |
537 | { | |
538 | int target; | |
539 | target = cpu->pstate.current_pstate - steps; | |
540 | intel_pstate_set_pstate(cpu, target); | |
541 | } | |
542 | ||
543 | static void intel_pstate_get_cpu_pstates(struct cpudata *cpu) | |
544 | { | |
016c8150 DB |
545 | cpu->pstate.min_pstate = pstate_funcs.get_min(); |
546 | cpu->pstate.max_pstate = pstate_funcs.get_max(); | |
547 | cpu->pstate.turbo_pstate = pstate_funcs.get_turbo(); | |
93f0822d | 548 | |
007bea09 DB |
549 | if (pstate_funcs.get_vid) |
550 | pstate_funcs.get_vid(cpu); | |
d40a63c4 | 551 | intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate); |
93f0822d DB |
552 | } |
553 | ||
6b17ddb2 | 554 | static inline void intel_pstate_calc_busy(struct cpudata *cpu) |
93f0822d | 555 | { |
6b17ddb2 | 556 | struct sample *sample = &cpu->sample; |
bf810222 DS |
557 | int64_t core_pct; |
558 | int32_t rem; | |
93f0822d | 559 | |
bf810222 DS |
560 | core_pct = int_tofp(sample->aperf) * int_tofp(100); |
561 | core_pct = div_u64_rem(core_pct, int_tofp(sample->mperf), &rem); | |
562 | ||
563 | if ((rem << 1) >= int_tofp(sample->mperf)) | |
564 | core_pct += 1; | |
e66c1768 | 565 | |
fcb6a15c | 566 | sample->freq = fp_toint( |
e66c1768 | 567 | mul_fp(int_tofp(cpu->pstate.max_pstate * 1000), core_pct)); |
fcb6a15c | 568 | |
bf810222 | 569 | sample->core_pct_busy = (int32_t)core_pct; |
93f0822d DB |
570 | } |
571 | ||
572 | static inline void intel_pstate_sample(struct cpudata *cpu) | |
573 | { | |
93f0822d DB |
574 | u64 aperf, mperf; |
575 | ||
93f0822d DB |
576 | rdmsrl(MSR_IA32_APERF, aperf); |
577 | rdmsrl(MSR_IA32_MPERF, mperf); | |
b69880f9 | 578 | |
e66c1768 DB |
579 | aperf = aperf >> FRAC_BITS; |
580 | mperf = mperf >> FRAC_BITS; | |
e66c1768 | 581 | |
c4ee841f DB |
582 | cpu->last_sample_time = cpu->sample.time; |
583 | cpu->sample.time = ktime_get(); | |
d37e2b76 DB |
584 | cpu->sample.aperf = aperf; |
585 | cpu->sample.mperf = mperf; | |
d37e2b76 DB |
586 | cpu->sample.aperf -= cpu->prev_aperf; |
587 | cpu->sample.mperf -= cpu->prev_mperf; | |
1abc4b20 | 588 | |
6b17ddb2 | 589 | intel_pstate_calc_busy(cpu); |
93f0822d | 590 | |
93f0822d DB |
591 | cpu->prev_aperf = aperf; |
592 | cpu->prev_mperf = mperf; | |
593 | } | |
594 | ||
595 | static inline void intel_pstate_set_sample_time(struct cpudata *cpu) | |
596 | { | |
597 | int sample_time, delay; | |
598 | ||
016c8150 | 599 | sample_time = pid_params.sample_rate_ms; |
93f0822d | 600 | delay = msecs_to_jiffies(sample_time); |
93f0822d DB |
601 | mod_timer_pinned(&cpu->timer, jiffies + delay); |
602 | } | |
603 | ||
d253d2a5 | 604 | static inline int32_t intel_pstate_get_scaled_busy(struct cpudata *cpu) |
93f0822d | 605 | { |
c4ee841f DB |
606 | int32_t core_busy, max_pstate, current_pstate, sample_ratio; |
607 | u32 duration_us; | |
608 | u32 sample_time; | |
93f0822d | 609 | |
d37e2b76 | 610 | core_busy = cpu->sample.core_pct_busy; |
2134ed4d | 611 | max_pstate = int_tofp(cpu->pstate.max_pstate); |
93f0822d | 612 | current_pstate = int_tofp(cpu->pstate.current_pstate); |
e66c1768 | 613 | core_busy = mul_fp(core_busy, div_fp(max_pstate, current_pstate)); |
c4ee841f DB |
614 | |
615 | sample_time = (pid_params.sample_rate_ms * USEC_PER_MSEC); | |
616 | duration_us = (u32) ktime_us_delta(cpu->sample.time, | |
617 | cpu->last_sample_time); | |
618 | if (duration_us > sample_time * 3) { | |
619 | sample_ratio = div_fp(int_tofp(sample_time), | |
620 | int_tofp(duration_us)); | |
621 | core_busy = mul_fp(core_busy, sample_ratio); | |
622 | } | |
623 | ||
f0fe3cd7 | 624 | return core_busy; |
93f0822d DB |
625 | } |
626 | ||
627 | static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu) | |
628 | { | |
d253d2a5 | 629 | int32_t busy_scaled; |
93f0822d DB |
630 | struct _pid *pid; |
631 | signed int ctl = 0; | |
632 | int steps; | |
633 | ||
634 | pid = &cpu->pid; | |
635 | busy_scaled = intel_pstate_get_scaled_busy(cpu); | |
636 | ||
637 | ctl = pid_calc(pid, busy_scaled); | |
638 | ||
639 | steps = abs(ctl); | |
b69880f9 | 640 | |
93f0822d DB |
641 | if (ctl < 0) |
642 | intel_pstate_pstate_increase(cpu, steps); | |
643 | else | |
644 | intel_pstate_pstate_decrease(cpu, steps); | |
645 | } | |
646 | ||
93f0822d DB |
647 | static void intel_pstate_timer_func(unsigned long __data) |
648 | { | |
649 | struct cpudata *cpu = (struct cpudata *) __data; | |
b69880f9 | 650 | struct sample *sample; |
93f0822d DB |
651 | |
652 | intel_pstate_sample(cpu); | |
b69880f9 | 653 | |
d37e2b76 | 654 | sample = &cpu->sample; |
b69880f9 | 655 | |
ca182aee | 656 | intel_pstate_adjust_busy_pstate(cpu); |
b69880f9 DB |
657 | |
658 | trace_pstate_sample(fp_toint(sample->core_pct_busy), | |
659 | fp_toint(intel_pstate_get_scaled_busy(cpu)), | |
660 | cpu->pstate.current_pstate, | |
661 | sample->mperf, | |
662 | sample->aperf, | |
b69880f9 DB |
663 | sample->freq); |
664 | ||
93f0822d DB |
665 | intel_pstate_set_sample_time(cpu); |
666 | } | |
667 | ||
668 | #define ICPU(model, policy) \ | |
6cbd7ee1 DB |
669 | { X86_VENDOR_INTEL, 6, model, X86_FEATURE_APERFMPERF,\ |
670 | (unsigned long)&policy } | |
93f0822d DB |
671 | |
672 | static const struct x86_cpu_id intel_pstate_cpu_ids[] = { | |
016c8150 DB |
673 | ICPU(0x2a, core_params), |
674 | ICPU(0x2d, core_params), | |
19e77c28 | 675 | ICPU(0x37, byt_params), |
016c8150 DB |
676 | ICPU(0x3a, core_params), |
677 | ICPU(0x3c, core_params), | |
c7e241df | 678 | ICPU(0x3d, core_params), |
016c8150 DB |
679 | ICPU(0x3e, core_params), |
680 | ICPU(0x3f, core_params), | |
681 | ICPU(0x45, core_params), | |
682 | ICPU(0x46, core_params), | |
c7e241df DB |
683 | ICPU(0x4f, core_params), |
684 | ICPU(0x56, core_params), | |
93f0822d DB |
685 | {} |
686 | }; | |
687 | MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids); | |
688 | ||
689 | static int intel_pstate_init_cpu(unsigned int cpunum) | |
690 | { | |
93f0822d DB |
691 | struct cpudata *cpu; |
692 | ||
93f0822d DB |
693 | all_cpu_data[cpunum] = kzalloc(sizeof(struct cpudata), GFP_KERNEL); |
694 | if (!all_cpu_data[cpunum]) | |
695 | return -ENOMEM; | |
696 | ||
697 | cpu = all_cpu_data[cpunum]; | |
698 | ||
699 | intel_pstate_get_cpu_pstates(cpu); | |
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 | 709 | intel_pstate_sample(cpu); |
93f0822d DB |
710 | |
711 | add_timer_on(&cpu->timer, cpunum); | |
712 | ||
713 | pr_info("Intel pstate controlling: cpu %d\n", cpunum); | |
714 | ||
715 | return 0; | |
716 | } | |
717 | ||
718 | static unsigned int intel_pstate_get(unsigned int cpu_num) | |
719 | { | |
720 | struct sample *sample; | |
721 | struct cpudata *cpu; | |
722 | ||
723 | cpu = all_cpu_data[cpu_num]; | |
724 | if (!cpu) | |
725 | return 0; | |
d37e2b76 | 726 | sample = &cpu->sample; |
93f0822d DB |
727 | return sample->freq; |
728 | } | |
729 | ||
730 | static int intel_pstate_set_policy(struct cpufreq_policy *policy) | |
731 | { | |
732 | struct cpudata *cpu; | |
93f0822d DB |
733 | |
734 | cpu = all_cpu_data[policy->cpu]; | |
735 | ||
d3929b83 DB |
736 | if (!policy->cpuinfo.max_freq) |
737 | return -ENODEV; | |
738 | ||
93f0822d DB |
739 | if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) { |
740 | limits.min_perf_pct = 100; | |
741 | limits.min_perf = int_tofp(1); | |
742 | limits.max_perf_pct = 100; | |
743 | limits.max_perf = int_tofp(1); | |
744 | limits.no_turbo = 0; | |
d1b68485 | 745 | return 0; |
93f0822d | 746 | } |
d1b68485 SP |
747 | limits.min_perf_pct = (policy->min * 100) / policy->cpuinfo.max_freq; |
748 | limits.min_perf_pct = clamp_t(int, limits.min_perf_pct, 0 , 100); | |
749 | limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100)); | |
750 | ||
d8f469e9 DB |
751 | limits.max_policy_pct = policy->max * 100 / policy->cpuinfo.max_freq; |
752 | limits.max_policy_pct = clamp_t(int, limits.max_policy_pct, 0 , 100); | |
753 | limits.max_perf_pct = min(limits.max_policy_pct, limits.max_sysfs_pct); | |
d1b68485 | 754 | limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100)); |
93f0822d DB |
755 | |
756 | return 0; | |
757 | } | |
758 | ||
759 | static int intel_pstate_verify_policy(struct cpufreq_policy *policy) | |
760 | { | |
be49e346 | 761 | cpufreq_verify_within_cpu_limits(policy); |
93f0822d DB |
762 | |
763 | if ((policy->policy != CPUFREQ_POLICY_POWERSAVE) && | |
764 | (policy->policy != CPUFREQ_POLICY_PERFORMANCE)) | |
765 | return -EINVAL; | |
766 | ||
767 | return 0; | |
768 | } | |
769 | ||
bb18008f | 770 | static void intel_pstate_stop_cpu(struct cpufreq_policy *policy) |
93f0822d | 771 | { |
bb18008f DB |
772 | int cpu_num = policy->cpu; |
773 | struct cpudata *cpu = all_cpu_data[cpu_num]; | |
93f0822d | 774 | |
bb18008f DB |
775 | pr_info("intel_pstate CPU %d exiting\n", cpu_num); |
776 | ||
c2294a2f | 777 | del_timer_sync(&all_cpu_data[cpu_num]->timer); |
bb18008f DB |
778 | intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate); |
779 | kfree(all_cpu_data[cpu_num]); | |
780 | all_cpu_data[cpu_num] = NULL; | |
93f0822d DB |
781 | } |
782 | ||
2760984f | 783 | static int intel_pstate_cpu_init(struct cpufreq_policy *policy) |
93f0822d | 784 | { |
93f0822d | 785 | struct cpudata *cpu; |
52e0a509 | 786 | int rc; |
93f0822d DB |
787 | |
788 | rc = intel_pstate_init_cpu(policy->cpu); | |
789 | if (rc) | |
790 | return rc; | |
791 | ||
792 | cpu = all_cpu_data[policy->cpu]; | |
793 | ||
794 | if (!limits.no_turbo && | |
795 | limits.min_perf_pct == 100 && limits.max_perf_pct == 100) | |
796 | policy->policy = CPUFREQ_POLICY_PERFORMANCE; | |
797 | else | |
798 | policy->policy = CPUFREQ_POLICY_POWERSAVE; | |
799 | ||
52e0a509 DB |
800 | policy->min = cpu->pstate.min_pstate * 100000; |
801 | policy->max = cpu->pstate.turbo_pstate * 100000; | |
93f0822d DB |
802 | |
803 | /* cpuinfo and default policy values */ | |
804 | policy->cpuinfo.min_freq = cpu->pstate.min_pstate * 100000; | |
805 | policy->cpuinfo.max_freq = cpu->pstate.turbo_pstate * 100000; | |
806 | policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL; | |
807 | cpumask_set_cpu(policy->cpu, policy->cpus); | |
808 | ||
809 | return 0; | |
810 | } | |
811 | ||
812 | static struct cpufreq_driver intel_pstate_driver = { | |
813 | .flags = CPUFREQ_CONST_LOOPS, | |
814 | .verify = intel_pstate_verify_policy, | |
815 | .setpolicy = intel_pstate_set_policy, | |
816 | .get = intel_pstate_get, | |
817 | .init = intel_pstate_cpu_init, | |
bb18008f | 818 | .stop_cpu = intel_pstate_stop_cpu, |
93f0822d | 819 | .name = "intel_pstate", |
93f0822d DB |
820 | }; |
821 | ||
6be26498 DB |
822 | static int __initdata no_load; |
823 | ||
b563b4e3 DB |
824 | static int intel_pstate_msrs_not_valid(void) |
825 | { | |
826 | /* Check that all the msr's we are using are valid. */ | |
827 | u64 aperf, mperf, tmp; | |
828 | ||
829 | rdmsrl(MSR_IA32_APERF, aperf); | |
830 | rdmsrl(MSR_IA32_MPERF, mperf); | |
831 | ||
016c8150 DB |
832 | if (!pstate_funcs.get_max() || |
833 | !pstate_funcs.get_min() || | |
834 | !pstate_funcs.get_turbo()) | |
b563b4e3 DB |
835 | return -ENODEV; |
836 | ||
837 | rdmsrl(MSR_IA32_APERF, tmp); | |
838 | if (!(tmp - aperf)) | |
839 | return -ENODEV; | |
840 | ||
841 | rdmsrl(MSR_IA32_MPERF, tmp); | |
842 | if (!(tmp - mperf)) | |
843 | return -ENODEV; | |
844 | ||
845 | return 0; | |
846 | } | |
016c8150 | 847 | |
e0a261a2 | 848 | static void copy_pid_params(struct pstate_adjust_policy *policy) |
016c8150 DB |
849 | { |
850 | pid_params.sample_rate_ms = policy->sample_rate_ms; | |
851 | pid_params.p_gain_pct = policy->p_gain_pct; | |
852 | pid_params.i_gain_pct = policy->i_gain_pct; | |
853 | pid_params.d_gain_pct = policy->d_gain_pct; | |
854 | pid_params.deadband = policy->deadband; | |
855 | pid_params.setpoint = policy->setpoint; | |
856 | } | |
857 | ||
e0a261a2 | 858 | static void copy_cpu_funcs(struct pstate_funcs *funcs) |
016c8150 DB |
859 | { |
860 | pstate_funcs.get_max = funcs->get_max; | |
861 | pstate_funcs.get_min = funcs->get_min; | |
862 | pstate_funcs.get_turbo = funcs->get_turbo; | |
863 | pstate_funcs.set = funcs->set; | |
007bea09 | 864 | pstate_funcs.get_vid = funcs->get_vid; |
016c8150 DB |
865 | } |
866 | ||
fbbcdc07 AH |
867 | #if IS_ENABLED(CONFIG_ACPI) |
868 | #include <acpi/processor.h> | |
869 | ||
870 | static bool intel_pstate_no_acpi_pss(void) | |
871 | { | |
872 | int i; | |
873 | ||
874 | for_each_possible_cpu(i) { | |
875 | acpi_status status; | |
876 | union acpi_object *pss; | |
877 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
878 | struct acpi_processor *pr = per_cpu(processors, i); | |
879 | ||
880 | if (!pr) | |
881 | continue; | |
882 | ||
883 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); | |
884 | if (ACPI_FAILURE(status)) | |
885 | continue; | |
886 | ||
887 | pss = buffer.pointer; | |
888 | if (pss && pss->type == ACPI_TYPE_PACKAGE) { | |
889 | kfree(pss); | |
890 | return false; | |
891 | } | |
892 | ||
893 | kfree(pss); | |
894 | } | |
895 | ||
896 | return true; | |
897 | } | |
898 | ||
899 | struct hw_vendor_info { | |
900 | u16 valid; | |
901 | char oem_id[ACPI_OEM_ID_SIZE]; | |
902 | char oem_table_id[ACPI_OEM_TABLE_ID_SIZE]; | |
903 | }; | |
904 | ||
905 | /* Hardware vendor-specific info that has its own power management modes */ | |
906 | static struct hw_vendor_info vendor_info[] = { | |
907 | {1, "HP ", "ProLiant"}, | |
908 | {0, "", ""}, | |
909 | }; | |
910 | ||
911 | static bool intel_pstate_platform_pwr_mgmt_exists(void) | |
912 | { | |
913 | struct acpi_table_header hdr; | |
914 | struct hw_vendor_info *v_info; | |
915 | ||
916 | if (acpi_disabled | |
917 | || ACPI_FAILURE(acpi_get_table_header(ACPI_SIG_FADT, 0, &hdr))) | |
918 | return false; | |
919 | ||
920 | for (v_info = vendor_info; v_info->valid; v_info++) { | |
921 | if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) | |
922 | && !strncmp(hdr.oem_table_id, v_info->oem_table_id, ACPI_OEM_TABLE_ID_SIZE) | |
923 | && intel_pstate_no_acpi_pss()) | |
924 | return true; | |
925 | } | |
926 | ||
927 | return false; | |
928 | } | |
929 | #else /* CONFIG_ACPI not enabled */ | |
930 | static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; } | |
931 | #endif /* CONFIG_ACPI */ | |
932 | ||
93f0822d DB |
933 | static int __init intel_pstate_init(void) |
934 | { | |
907cc908 | 935 | int cpu, rc = 0; |
93f0822d | 936 | const struct x86_cpu_id *id; |
016c8150 | 937 | struct cpu_defaults *cpu_info; |
93f0822d | 938 | |
6be26498 DB |
939 | if (no_load) |
940 | return -ENODEV; | |
941 | ||
93f0822d DB |
942 | id = x86_match_cpu(intel_pstate_cpu_ids); |
943 | if (!id) | |
944 | return -ENODEV; | |
945 | ||
fbbcdc07 AH |
946 | /* |
947 | * The Intel pstate driver will be ignored if the platform | |
948 | * firmware has its own power management modes. | |
949 | */ | |
950 | if (intel_pstate_platform_pwr_mgmt_exists()) | |
951 | return -ENODEV; | |
952 | ||
016c8150 DB |
953 | cpu_info = (struct cpu_defaults *)id->driver_data; |
954 | ||
955 | copy_pid_params(&cpu_info->pid_policy); | |
956 | copy_cpu_funcs(&cpu_info->funcs); | |
957 | ||
b563b4e3 DB |
958 | if (intel_pstate_msrs_not_valid()) |
959 | return -ENODEV; | |
960 | ||
93f0822d DB |
961 | pr_info("Intel P-state driver initializing.\n"); |
962 | ||
b57ffac5 | 963 | all_cpu_data = vzalloc(sizeof(void *) * num_possible_cpus()); |
93f0822d DB |
964 | if (!all_cpu_data) |
965 | return -ENOMEM; | |
93f0822d DB |
966 | |
967 | rc = cpufreq_register_driver(&intel_pstate_driver); | |
968 | if (rc) | |
969 | goto out; | |
970 | ||
971 | intel_pstate_debug_expose_params(); | |
972 | intel_pstate_sysfs_expose_params(); | |
b69880f9 | 973 | |
93f0822d DB |
974 | return rc; |
975 | out: | |
907cc908 DB |
976 | get_online_cpus(); |
977 | for_each_online_cpu(cpu) { | |
978 | if (all_cpu_data[cpu]) { | |
979 | del_timer_sync(&all_cpu_data[cpu]->timer); | |
980 | kfree(all_cpu_data[cpu]); | |
981 | } | |
982 | } | |
983 | ||
984 | put_online_cpus(); | |
985 | vfree(all_cpu_data); | |
93f0822d DB |
986 | return -ENODEV; |
987 | } | |
988 | device_initcall(intel_pstate_init); | |
989 | ||
6be26498 DB |
990 | static int __init intel_pstate_setup(char *str) |
991 | { | |
992 | if (!str) | |
993 | return -EINVAL; | |
994 | ||
995 | if (!strcmp(str, "disable")) | |
996 | no_load = 1; | |
997 | return 0; | |
998 | } | |
999 | early_param("intel_pstate", intel_pstate_setup); | |
1000 | ||
93f0822d DB |
1001 | MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>"); |
1002 | MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors"); | |
1003 | MODULE_LICENSE("GPL"); |