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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> |
d6472302 | 29 | #include <linux/vmalloc.h> |
93f0822d DB |
30 | #include <trace/events/power.h> |
31 | ||
32 | #include <asm/div64.h> | |
33 | #include <asm/msr.h> | |
34 | #include <asm/cpu_device_id.h> | |
64df1fdf | 35 | #include <asm/cpufeature.h> |
93f0822d | 36 | |
61d8d2ab DB |
37 | #define BYT_RATIOS 0x66a |
38 | #define BYT_VIDS 0x66b | |
39 | #define BYT_TURBO_RATIOS 0x66c | |
21855ff5 | 40 | #define BYT_TURBO_VIDS 0x66d |
61d8d2ab | 41 | |
f0fe3cd7 | 42 | #define FRAC_BITS 8 |
93f0822d DB |
43 | #define int_tofp(X) ((int64_t)(X) << FRAC_BITS) |
44 | #define fp_toint(X) ((X) >> FRAC_BITS) | |
f0fe3cd7 | 45 | |
93f0822d DB |
46 | |
47 | static inline int32_t mul_fp(int32_t x, int32_t y) | |
48 | { | |
49 | return ((int64_t)x * (int64_t)y) >> FRAC_BITS; | |
50 | } | |
51 | ||
7180dddf | 52 | static inline int32_t div_fp(s64 x, s64 y) |
93f0822d | 53 | { |
7180dddf | 54 | return div64_s64((int64_t)x << FRAC_BITS, y); |
93f0822d DB |
55 | } |
56 | ||
d022a65e DB |
57 | static inline int ceiling_fp(int32_t x) |
58 | { | |
59 | int mask, ret; | |
60 | ||
61 | ret = fp_toint(x); | |
62 | mask = (1 << FRAC_BITS) - 1; | |
63 | if (x & mask) | |
64 | ret += 1; | |
65 | return ret; | |
66 | } | |
67 | ||
93f0822d | 68 | struct sample { |
d253d2a5 | 69 | int32_t core_pct_busy; |
93f0822d DB |
70 | u64 aperf; |
71 | u64 mperf; | |
4055fad3 | 72 | u64 tsc; |
93f0822d | 73 | int freq; |
c4ee841f | 74 | ktime_t time; |
93f0822d DB |
75 | }; |
76 | ||
77 | struct pstate_data { | |
78 | int current_pstate; | |
79 | int min_pstate; | |
80 | int max_pstate; | |
b27580b0 | 81 | int scaling; |
93f0822d DB |
82 | int turbo_pstate; |
83 | }; | |
84 | ||
007bea09 | 85 | struct vid_data { |
21855ff5 DB |
86 | int min; |
87 | int max; | |
88 | int turbo; | |
007bea09 DB |
89 | int32_t ratio; |
90 | }; | |
91 | ||
93f0822d DB |
92 | struct _pid { |
93 | int setpoint; | |
94 | int32_t integral; | |
95 | int32_t p_gain; | |
96 | int32_t i_gain; | |
97 | int32_t d_gain; | |
98 | int deadband; | |
d253d2a5 | 99 | int32_t last_err; |
93f0822d DB |
100 | }; |
101 | ||
102 | struct cpudata { | |
103 | int cpu; | |
104 | ||
93f0822d DB |
105 | struct timer_list timer; |
106 | ||
93f0822d | 107 | struct pstate_data pstate; |
007bea09 | 108 | struct vid_data vid; |
93f0822d | 109 | struct _pid pid; |
93f0822d | 110 | |
c4ee841f | 111 | ktime_t last_sample_time; |
93f0822d DB |
112 | u64 prev_aperf; |
113 | u64 prev_mperf; | |
4055fad3 | 114 | u64 prev_tsc; |
d37e2b76 | 115 | struct sample sample; |
93f0822d DB |
116 | }; |
117 | ||
118 | static struct cpudata **all_cpu_data; | |
119 | struct pstate_adjust_policy { | |
120 | int sample_rate_ms; | |
121 | int deadband; | |
122 | int setpoint; | |
123 | int p_gain_pct; | |
124 | int d_gain_pct; | |
125 | int i_gain_pct; | |
126 | }; | |
127 | ||
016c8150 DB |
128 | struct pstate_funcs { |
129 | int (*get_max)(void); | |
130 | int (*get_min)(void); | |
131 | int (*get_turbo)(void); | |
b27580b0 | 132 | int (*get_scaling)(void); |
007bea09 DB |
133 | void (*set)(struct cpudata*, int pstate); |
134 | void (*get_vid)(struct cpudata *); | |
93f0822d DB |
135 | }; |
136 | ||
016c8150 DB |
137 | struct cpu_defaults { |
138 | struct pstate_adjust_policy pid_policy; | |
139 | struct pstate_funcs funcs; | |
93f0822d DB |
140 | }; |
141 | ||
016c8150 DB |
142 | static struct pstate_adjust_policy pid_params; |
143 | static struct pstate_funcs pstate_funcs; | |
2f86dc4c | 144 | static int hwp_active; |
016c8150 | 145 | |
93f0822d DB |
146 | struct perf_limits { |
147 | int no_turbo; | |
dd5fbf70 | 148 | int turbo_disabled; |
93f0822d DB |
149 | int max_perf_pct; |
150 | int min_perf_pct; | |
151 | int32_t max_perf; | |
152 | int32_t min_perf; | |
d8f469e9 DB |
153 | int max_policy_pct; |
154 | int max_sysfs_pct; | |
a0475992 KCA |
155 | int min_policy_pct; |
156 | int min_sysfs_pct; | |
93f0822d DB |
157 | }; |
158 | ||
159 | static struct perf_limits limits = { | |
160 | .no_turbo = 0, | |
4521e1a0 | 161 | .turbo_disabled = 0, |
93f0822d DB |
162 | .max_perf_pct = 100, |
163 | .max_perf = int_tofp(1), | |
164 | .min_perf_pct = 0, | |
165 | .min_perf = 0, | |
d8f469e9 DB |
166 | .max_policy_pct = 100, |
167 | .max_sysfs_pct = 100, | |
a0475992 KCA |
168 | .min_policy_pct = 0, |
169 | .min_sysfs_pct = 0, | |
93f0822d DB |
170 | }; |
171 | ||
172 | static inline void pid_reset(struct _pid *pid, int setpoint, int busy, | |
c410833a | 173 | int deadband, int integral) { |
93f0822d DB |
174 | pid->setpoint = setpoint; |
175 | pid->deadband = deadband; | |
176 | pid->integral = int_tofp(integral); | |
d98d099b | 177 | pid->last_err = int_tofp(setpoint) - int_tofp(busy); |
93f0822d DB |
178 | } |
179 | ||
180 | static inline void pid_p_gain_set(struct _pid *pid, int percent) | |
181 | { | |
182 | pid->p_gain = div_fp(int_tofp(percent), int_tofp(100)); | |
183 | } | |
184 | ||
185 | static inline void pid_i_gain_set(struct _pid *pid, int percent) | |
186 | { | |
187 | pid->i_gain = div_fp(int_tofp(percent), int_tofp(100)); | |
188 | } | |
189 | ||
190 | static inline void pid_d_gain_set(struct _pid *pid, int percent) | |
191 | { | |
93f0822d DB |
192 | pid->d_gain = div_fp(int_tofp(percent), int_tofp(100)); |
193 | } | |
194 | ||
d253d2a5 | 195 | static signed int pid_calc(struct _pid *pid, int32_t busy) |
93f0822d | 196 | { |
d253d2a5 | 197 | signed int result; |
93f0822d DB |
198 | int32_t pterm, dterm, fp_error; |
199 | int32_t integral_limit; | |
200 | ||
d253d2a5 | 201 | fp_error = int_tofp(pid->setpoint) - busy; |
93f0822d | 202 | |
d253d2a5 | 203 | if (abs(fp_error) <= int_tofp(pid->deadband)) |
93f0822d DB |
204 | return 0; |
205 | ||
206 | pterm = mul_fp(pid->p_gain, fp_error); | |
207 | ||
208 | pid->integral += fp_error; | |
209 | ||
e0d4c8f8 KCA |
210 | /* |
211 | * We limit the integral here so that it will never | |
212 | * get higher than 30. This prevents it from becoming | |
213 | * too large an input over long periods of time and allows | |
214 | * it to get factored out sooner. | |
215 | * | |
216 | * The value of 30 was chosen through experimentation. | |
217 | */ | |
93f0822d DB |
218 | integral_limit = int_tofp(30); |
219 | if (pid->integral > integral_limit) | |
220 | pid->integral = integral_limit; | |
221 | if (pid->integral < -integral_limit) | |
222 | pid->integral = -integral_limit; | |
223 | ||
d253d2a5 BS |
224 | dterm = mul_fp(pid->d_gain, fp_error - pid->last_err); |
225 | pid->last_err = fp_error; | |
93f0822d DB |
226 | |
227 | result = pterm + mul_fp(pid->integral, pid->i_gain) + dterm; | |
51d211e9 | 228 | result = result + (1 << (FRAC_BITS-1)); |
93f0822d DB |
229 | return (signed int)fp_toint(result); |
230 | } | |
231 | ||
232 | static inline void intel_pstate_busy_pid_reset(struct cpudata *cpu) | |
233 | { | |
016c8150 DB |
234 | pid_p_gain_set(&cpu->pid, pid_params.p_gain_pct); |
235 | pid_d_gain_set(&cpu->pid, pid_params.d_gain_pct); | |
236 | pid_i_gain_set(&cpu->pid, pid_params.i_gain_pct); | |
93f0822d | 237 | |
2d8d1f18 | 238 | pid_reset(&cpu->pid, pid_params.setpoint, 100, pid_params.deadband, 0); |
93f0822d DB |
239 | } |
240 | ||
93f0822d DB |
241 | static inline void intel_pstate_reset_all_pid(void) |
242 | { | |
243 | unsigned int cpu; | |
845c1cbe | 244 | |
93f0822d DB |
245 | for_each_online_cpu(cpu) { |
246 | if (all_cpu_data[cpu]) | |
247 | intel_pstate_busy_pid_reset(all_cpu_data[cpu]); | |
248 | } | |
249 | } | |
250 | ||
4521e1a0 GM |
251 | static inline void update_turbo_state(void) |
252 | { | |
253 | u64 misc_en; | |
254 | struct cpudata *cpu; | |
255 | ||
256 | cpu = all_cpu_data[0]; | |
257 | rdmsrl(MSR_IA32_MISC_ENABLE, misc_en); | |
258 | limits.turbo_disabled = | |
259 | (misc_en & MSR_IA32_MISC_ENABLE_TURBO_DISABLE || | |
260 | cpu->pstate.max_pstate == cpu->pstate.turbo_pstate); | |
261 | } | |
262 | ||
2f86dc4c DB |
263 | static void intel_pstate_hwp_set(void) |
264 | { | |
74da56ce KCA |
265 | int min, hw_min, max, hw_max, cpu, range, adj_range; |
266 | u64 value, cap; | |
267 | ||
268 | rdmsrl(MSR_HWP_CAPABILITIES, cap); | |
269 | hw_min = HWP_LOWEST_PERF(cap); | |
270 | hw_max = HWP_HIGHEST_PERF(cap); | |
271 | range = hw_max - hw_min; | |
2f86dc4c DB |
272 | |
273 | get_online_cpus(); | |
274 | ||
275 | for_each_online_cpu(cpu) { | |
276 | rdmsrl_on_cpu(cpu, MSR_HWP_REQUEST, &value); | |
74da56ce KCA |
277 | adj_range = limits.min_perf_pct * range / 100; |
278 | min = hw_min + adj_range; | |
2f86dc4c DB |
279 | value &= ~HWP_MIN_PERF(~0L); |
280 | value |= HWP_MIN_PERF(min); | |
281 | ||
74da56ce KCA |
282 | adj_range = limits.max_perf_pct * range / 100; |
283 | max = hw_min + adj_range; | |
2f86dc4c | 284 | if (limits.no_turbo) { |
74da56ce KCA |
285 | hw_max = HWP_GUARANTEED_PERF(cap); |
286 | if (hw_max < max) | |
287 | max = hw_max; | |
2f86dc4c DB |
288 | } |
289 | ||
290 | value &= ~HWP_MAX_PERF(~0L); | |
291 | value |= HWP_MAX_PERF(max); | |
292 | wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value); | |
293 | } | |
294 | ||
295 | put_online_cpus(); | |
296 | } | |
297 | ||
93f0822d DB |
298 | /************************** debugfs begin ************************/ |
299 | static int pid_param_set(void *data, u64 val) | |
300 | { | |
301 | *(u32 *)data = val; | |
302 | intel_pstate_reset_all_pid(); | |
303 | return 0; | |
304 | } | |
845c1cbe | 305 | |
93f0822d DB |
306 | static int pid_param_get(void *data, u64 *val) |
307 | { | |
308 | *val = *(u32 *)data; | |
309 | return 0; | |
310 | } | |
2d8d1f18 | 311 | DEFINE_SIMPLE_ATTRIBUTE(fops_pid_param, pid_param_get, pid_param_set, "%llu\n"); |
93f0822d DB |
312 | |
313 | struct pid_param { | |
314 | char *name; | |
315 | void *value; | |
316 | }; | |
317 | ||
318 | static struct pid_param pid_files[] = { | |
016c8150 DB |
319 | {"sample_rate_ms", &pid_params.sample_rate_ms}, |
320 | {"d_gain_pct", &pid_params.d_gain_pct}, | |
321 | {"i_gain_pct", &pid_params.i_gain_pct}, | |
322 | {"deadband", &pid_params.deadband}, | |
323 | {"setpoint", &pid_params.setpoint}, | |
324 | {"p_gain_pct", &pid_params.p_gain_pct}, | |
93f0822d DB |
325 | {NULL, NULL} |
326 | }; | |
327 | ||
317dd50e | 328 | static void __init intel_pstate_debug_expose_params(void) |
93f0822d | 329 | { |
317dd50e | 330 | struct dentry *debugfs_parent; |
93f0822d DB |
331 | int i = 0; |
332 | ||
2f86dc4c DB |
333 | if (hwp_active) |
334 | return; | |
93f0822d DB |
335 | debugfs_parent = debugfs_create_dir("pstate_snb", NULL); |
336 | if (IS_ERR_OR_NULL(debugfs_parent)) | |
337 | return; | |
338 | while (pid_files[i].name) { | |
339 | debugfs_create_file(pid_files[i].name, 0660, | |
c410833a SK |
340 | debugfs_parent, pid_files[i].value, |
341 | &fops_pid_param); | |
93f0822d DB |
342 | i++; |
343 | } | |
344 | } | |
345 | ||
346 | /************************** debugfs end ************************/ | |
347 | ||
348 | /************************** sysfs begin ************************/ | |
349 | #define show_one(file_name, object) \ | |
350 | static ssize_t show_##file_name \ | |
351 | (struct kobject *kobj, struct attribute *attr, char *buf) \ | |
352 | { \ | |
353 | return sprintf(buf, "%u\n", limits.object); \ | |
354 | } | |
355 | ||
d01b1f48 KCA |
356 | static ssize_t show_turbo_pct(struct kobject *kobj, |
357 | struct attribute *attr, char *buf) | |
358 | { | |
359 | struct cpudata *cpu; | |
360 | int total, no_turbo, turbo_pct; | |
361 | uint32_t turbo_fp; | |
362 | ||
363 | cpu = all_cpu_data[0]; | |
364 | ||
365 | total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1; | |
366 | no_turbo = cpu->pstate.max_pstate - cpu->pstate.min_pstate + 1; | |
367 | turbo_fp = div_fp(int_tofp(no_turbo), int_tofp(total)); | |
368 | turbo_pct = 100 - fp_toint(mul_fp(turbo_fp, int_tofp(100))); | |
369 | return sprintf(buf, "%u\n", turbo_pct); | |
370 | } | |
371 | ||
0522424e KCA |
372 | static ssize_t show_num_pstates(struct kobject *kobj, |
373 | struct attribute *attr, char *buf) | |
374 | { | |
375 | struct cpudata *cpu; | |
376 | int total; | |
377 | ||
378 | cpu = all_cpu_data[0]; | |
379 | total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1; | |
380 | return sprintf(buf, "%u\n", total); | |
381 | } | |
382 | ||
4521e1a0 GM |
383 | static ssize_t show_no_turbo(struct kobject *kobj, |
384 | struct attribute *attr, char *buf) | |
385 | { | |
386 | ssize_t ret; | |
387 | ||
388 | update_turbo_state(); | |
389 | if (limits.turbo_disabled) | |
390 | ret = sprintf(buf, "%u\n", limits.turbo_disabled); | |
391 | else | |
392 | ret = sprintf(buf, "%u\n", limits.no_turbo); | |
393 | ||
394 | return ret; | |
395 | } | |
396 | ||
93f0822d | 397 | static ssize_t store_no_turbo(struct kobject *a, struct attribute *b, |
c410833a | 398 | const char *buf, size_t count) |
93f0822d DB |
399 | { |
400 | unsigned int input; | |
401 | int ret; | |
845c1cbe | 402 | |
93f0822d DB |
403 | ret = sscanf(buf, "%u", &input); |
404 | if (ret != 1) | |
405 | return -EINVAL; | |
4521e1a0 GM |
406 | |
407 | update_turbo_state(); | |
dd5fbf70 | 408 | if (limits.turbo_disabled) { |
f16255eb | 409 | pr_warn("intel_pstate: Turbo disabled by BIOS or unavailable on processor\n"); |
4521e1a0 | 410 | return -EPERM; |
dd5fbf70 | 411 | } |
2f86dc4c | 412 | |
4521e1a0 GM |
413 | limits.no_turbo = clamp_t(int, input, 0, 1); |
414 | ||
2f86dc4c DB |
415 | if (hwp_active) |
416 | intel_pstate_hwp_set(); | |
417 | ||
93f0822d DB |
418 | return count; |
419 | } | |
420 | ||
421 | static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b, | |
c410833a | 422 | const char *buf, size_t count) |
93f0822d DB |
423 | { |
424 | unsigned int input; | |
425 | int ret; | |
845c1cbe | 426 | |
93f0822d DB |
427 | ret = sscanf(buf, "%u", &input); |
428 | if (ret != 1) | |
429 | return -EINVAL; | |
430 | ||
d8f469e9 DB |
431 | limits.max_sysfs_pct = clamp_t(int, input, 0 , 100); |
432 | limits.max_perf_pct = min(limits.max_policy_pct, limits.max_sysfs_pct); | |
43717aad CY |
433 | limits.max_perf_pct = max(limits.min_policy_pct, limits.max_perf_pct); |
434 | limits.max_perf_pct = max(limits.min_perf_pct, limits.max_perf_pct); | |
93f0822d | 435 | limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100)); |
845c1cbe | 436 | |
2f86dc4c DB |
437 | if (hwp_active) |
438 | intel_pstate_hwp_set(); | |
93f0822d DB |
439 | return count; |
440 | } | |
441 | ||
442 | static ssize_t store_min_perf_pct(struct kobject *a, struct attribute *b, | |
c410833a | 443 | const char *buf, size_t count) |
93f0822d DB |
444 | { |
445 | unsigned int input; | |
446 | int ret; | |
845c1cbe | 447 | |
93f0822d DB |
448 | ret = sscanf(buf, "%u", &input); |
449 | if (ret != 1) | |
450 | return -EINVAL; | |
a0475992 KCA |
451 | |
452 | limits.min_sysfs_pct = clamp_t(int, input, 0 , 100); | |
453 | limits.min_perf_pct = max(limits.min_policy_pct, limits.min_sysfs_pct); | |
43717aad CY |
454 | limits.min_perf_pct = min(limits.max_policy_pct, limits.min_perf_pct); |
455 | limits.min_perf_pct = min(limits.max_perf_pct, limits.min_perf_pct); | |
93f0822d DB |
456 | limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100)); |
457 | ||
2f86dc4c DB |
458 | if (hwp_active) |
459 | intel_pstate_hwp_set(); | |
93f0822d DB |
460 | return count; |
461 | } | |
462 | ||
93f0822d DB |
463 | show_one(max_perf_pct, max_perf_pct); |
464 | show_one(min_perf_pct, min_perf_pct); | |
465 | ||
466 | define_one_global_rw(no_turbo); | |
467 | define_one_global_rw(max_perf_pct); | |
468 | define_one_global_rw(min_perf_pct); | |
d01b1f48 | 469 | define_one_global_ro(turbo_pct); |
0522424e | 470 | define_one_global_ro(num_pstates); |
93f0822d DB |
471 | |
472 | static struct attribute *intel_pstate_attributes[] = { | |
473 | &no_turbo.attr, | |
474 | &max_perf_pct.attr, | |
475 | &min_perf_pct.attr, | |
d01b1f48 | 476 | &turbo_pct.attr, |
0522424e | 477 | &num_pstates.attr, |
93f0822d DB |
478 | NULL |
479 | }; | |
480 | ||
481 | static struct attribute_group intel_pstate_attr_group = { | |
482 | .attrs = intel_pstate_attributes, | |
483 | }; | |
93f0822d | 484 | |
317dd50e | 485 | static void __init intel_pstate_sysfs_expose_params(void) |
93f0822d | 486 | { |
317dd50e | 487 | struct kobject *intel_pstate_kobject; |
93f0822d DB |
488 | int rc; |
489 | ||
490 | intel_pstate_kobject = kobject_create_and_add("intel_pstate", | |
491 | &cpu_subsys.dev_root->kobj); | |
492 | BUG_ON(!intel_pstate_kobject); | |
2d8d1f18 | 493 | rc = sysfs_create_group(intel_pstate_kobject, &intel_pstate_attr_group); |
93f0822d DB |
494 | BUG_ON(rc); |
495 | } | |
93f0822d | 496 | /************************** sysfs end ************************/ |
2f86dc4c | 497 | |
ba88d433 | 498 | static void intel_pstate_hwp_enable(struct cpudata *cpudata) |
2f86dc4c | 499 | { |
f16255eb | 500 | pr_info("intel_pstate: HWP enabled\n"); |
2f86dc4c | 501 | |
ba88d433 | 502 | wrmsrl_on_cpu(cpudata->cpu, MSR_PM_ENABLE, 0x1); |
2f86dc4c DB |
503 | } |
504 | ||
19e77c28 DB |
505 | static int byt_get_min_pstate(void) |
506 | { | |
507 | u64 value; | |
845c1cbe | 508 | |
19e77c28 | 509 | rdmsrl(BYT_RATIOS, value); |
c16ed060 | 510 | return (value >> 8) & 0x7F; |
19e77c28 DB |
511 | } |
512 | ||
513 | static int byt_get_max_pstate(void) | |
514 | { | |
515 | u64 value; | |
845c1cbe | 516 | |
19e77c28 | 517 | rdmsrl(BYT_RATIOS, value); |
c16ed060 | 518 | return (value >> 16) & 0x7F; |
19e77c28 | 519 | } |
93f0822d | 520 | |
61d8d2ab DB |
521 | static int byt_get_turbo_pstate(void) |
522 | { | |
523 | u64 value; | |
845c1cbe | 524 | |
61d8d2ab | 525 | rdmsrl(BYT_TURBO_RATIOS, value); |
c16ed060 | 526 | return value & 0x7F; |
61d8d2ab DB |
527 | } |
528 | ||
007bea09 DB |
529 | static void byt_set_pstate(struct cpudata *cpudata, int pstate) |
530 | { | |
531 | u64 val; | |
532 | int32_t vid_fp; | |
533 | u32 vid; | |
534 | ||
144c8e17 | 535 | val = (u64)pstate << 8; |
dd5fbf70 | 536 | if (limits.no_turbo && !limits.turbo_disabled) |
007bea09 DB |
537 | val |= (u64)1 << 32; |
538 | ||
539 | vid_fp = cpudata->vid.min + mul_fp( | |
540 | int_tofp(pstate - cpudata->pstate.min_pstate), | |
541 | cpudata->vid.ratio); | |
542 | ||
543 | vid_fp = clamp_t(int32_t, vid_fp, cpudata->vid.min, cpudata->vid.max); | |
d022a65e | 544 | vid = ceiling_fp(vid_fp); |
007bea09 | 545 | |
21855ff5 DB |
546 | if (pstate > cpudata->pstate.max_pstate) |
547 | vid = cpudata->vid.turbo; | |
548 | ||
007bea09 DB |
549 | val |= vid; |
550 | ||
0dd23f94 | 551 | wrmsrl_on_cpu(cpudata->cpu, MSR_IA32_PERF_CTL, val); |
007bea09 DB |
552 | } |
553 | ||
b27580b0 DB |
554 | #define BYT_BCLK_FREQS 5 |
555 | static int byt_freq_table[BYT_BCLK_FREQS] = { 833, 1000, 1333, 1167, 800}; | |
556 | ||
557 | static int byt_get_scaling(void) | |
558 | { | |
559 | u64 value; | |
560 | int i; | |
561 | ||
562 | rdmsrl(MSR_FSB_FREQ, value); | |
563 | i = value & 0x3; | |
564 | ||
565 | BUG_ON(i > BYT_BCLK_FREQS); | |
566 | ||
567 | return byt_freq_table[i] * 100; | |
568 | } | |
569 | ||
007bea09 DB |
570 | static void byt_get_vid(struct cpudata *cpudata) |
571 | { | |
572 | u64 value; | |
573 | ||
574 | rdmsrl(BYT_VIDS, value); | |
c16ed060 DB |
575 | cpudata->vid.min = int_tofp((value >> 8) & 0x7f); |
576 | cpudata->vid.max = int_tofp((value >> 16) & 0x7f); | |
007bea09 DB |
577 | cpudata->vid.ratio = div_fp( |
578 | cpudata->vid.max - cpudata->vid.min, | |
579 | int_tofp(cpudata->pstate.max_pstate - | |
580 | cpudata->pstate.min_pstate)); | |
21855ff5 DB |
581 | |
582 | rdmsrl(BYT_TURBO_VIDS, value); | |
583 | cpudata->vid.turbo = value & 0x7f; | |
007bea09 DB |
584 | } |
585 | ||
016c8150 | 586 | static int core_get_min_pstate(void) |
93f0822d DB |
587 | { |
588 | u64 value; | |
845c1cbe | 589 | |
05e99c8c | 590 | rdmsrl(MSR_PLATFORM_INFO, value); |
93f0822d DB |
591 | return (value >> 40) & 0xFF; |
592 | } | |
593 | ||
016c8150 | 594 | static int core_get_max_pstate(void) |
93f0822d DB |
595 | { |
596 | u64 value; | |
845c1cbe | 597 | |
05e99c8c | 598 | rdmsrl(MSR_PLATFORM_INFO, value); |
93f0822d DB |
599 | return (value >> 8) & 0xFF; |
600 | } | |
601 | ||
016c8150 | 602 | static int core_get_turbo_pstate(void) |
93f0822d DB |
603 | { |
604 | u64 value; | |
605 | int nont, ret; | |
845c1cbe | 606 | |
05e99c8c | 607 | rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT, value); |
016c8150 | 608 | nont = core_get_max_pstate(); |
285cb990 | 609 | ret = (value) & 255; |
93f0822d DB |
610 | if (ret <= nont) |
611 | ret = nont; | |
612 | return ret; | |
613 | } | |
614 | ||
b27580b0 DB |
615 | static inline int core_get_scaling(void) |
616 | { | |
617 | return 100000; | |
618 | } | |
619 | ||
007bea09 | 620 | static void core_set_pstate(struct cpudata *cpudata, int pstate) |
016c8150 DB |
621 | { |
622 | u64 val; | |
623 | ||
144c8e17 | 624 | val = (u64)pstate << 8; |
dd5fbf70 | 625 | if (limits.no_turbo && !limits.turbo_disabled) |
016c8150 DB |
626 | val |= (u64)1 << 32; |
627 | ||
bb18008f | 628 | wrmsrl_on_cpu(cpudata->cpu, MSR_IA32_PERF_CTL, val); |
016c8150 DB |
629 | } |
630 | ||
b34ef932 DC |
631 | static int knl_get_turbo_pstate(void) |
632 | { | |
633 | u64 value; | |
634 | int nont, ret; | |
635 | ||
636 | rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT, value); | |
637 | nont = core_get_max_pstate(); | |
638 | ret = (((value) >> 8) & 0xFF); | |
639 | if (ret <= nont) | |
640 | ret = nont; | |
641 | return ret; | |
642 | } | |
643 | ||
016c8150 DB |
644 | static struct cpu_defaults core_params = { |
645 | .pid_policy = { | |
646 | .sample_rate_ms = 10, | |
647 | .deadband = 0, | |
648 | .setpoint = 97, | |
649 | .p_gain_pct = 20, | |
650 | .d_gain_pct = 0, | |
651 | .i_gain_pct = 0, | |
652 | }, | |
653 | .funcs = { | |
654 | .get_max = core_get_max_pstate, | |
655 | .get_min = core_get_min_pstate, | |
656 | .get_turbo = core_get_turbo_pstate, | |
b27580b0 | 657 | .get_scaling = core_get_scaling, |
016c8150 DB |
658 | .set = core_set_pstate, |
659 | }, | |
660 | }; | |
661 | ||
19e77c28 DB |
662 | static struct cpu_defaults byt_params = { |
663 | .pid_policy = { | |
664 | .sample_rate_ms = 10, | |
665 | .deadband = 0, | |
6a82ba6d | 666 | .setpoint = 60, |
19e77c28 DB |
667 | .p_gain_pct = 14, |
668 | .d_gain_pct = 0, | |
669 | .i_gain_pct = 4, | |
670 | }, | |
671 | .funcs = { | |
672 | .get_max = byt_get_max_pstate, | |
673 | .get_min = byt_get_min_pstate, | |
61d8d2ab | 674 | .get_turbo = byt_get_turbo_pstate, |
007bea09 | 675 | .set = byt_set_pstate, |
b27580b0 | 676 | .get_scaling = byt_get_scaling, |
007bea09 | 677 | .get_vid = byt_get_vid, |
19e77c28 DB |
678 | }, |
679 | }; | |
680 | ||
b34ef932 DC |
681 | static struct cpu_defaults knl_params = { |
682 | .pid_policy = { | |
683 | .sample_rate_ms = 10, | |
684 | .deadband = 0, | |
685 | .setpoint = 97, | |
686 | .p_gain_pct = 20, | |
687 | .d_gain_pct = 0, | |
688 | .i_gain_pct = 0, | |
689 | }, | |
690 | .funcs = { | |
691 | .get_max = core_get_max_pstate, | |
692 | .get_min = core_get_min_pstate, | |
693 | .get_turbo = knl_get_turbo_pstate, | |
69cefc27 | 694 | .get_scaling = core_get_scaling, |
b34ef932 DC |
695 | .set = core_set_pstate, |
696 | }, | |
697 | }; | |
698 | ||
93f0822d DB |
699 | static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max) |
700 | { | |
701 | int max_perf = cpu->pstate.turbo_pstate; | |
7244cb62 | 702 | int max_perf_adj; |
93f0822d | 703 | int min_perf; |
845c1cbe | 704 | |
4521e1a0 | 705 | if (limits.no_turbo || limits.turbo_disabled) |
93f0822d DB |
706 | max_perf = cpu->pstate.max_pstate; |
707 | ||
e0d4c8f8 KCA |
708 | /* |
709 | * performance can be limited by user through sysfs, by cpufreq | |
710 | * policy, or by cpu specific default values determined through | |
711 | * experimentation. | |
712 | */ | |
7244cb62 DB |
713 | max_perf_adj = fp_toint(mul_fp(int_tofp(max_perf), limits.max_perf)); |
714 | *max = clamp_t(int, max_perf_adj, | |
93f0822d DB |
715 | cpu->pstate.min_pstate, cpu->pstate.turbo_pstate); |
716 | ||
717 | min_perf = fp_toint(mul_fp(int_tofp(max_perf), limits.min_perf)); | |
2d8d1f18 | 718 | *min = clamp_t(int, min_perf, cpu->pstate.min_pstate, max_perf); |
93f0822d DB |
719 | } |
720 | ||
6c1e4591 | 721 | static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate, bool force) |
93f0822d DB |
722 | { |
723 | int max_perf, min_perf; | |
724 | ||
6c1e4591 DS |
725 | if (force) { |
726 | update_turbo_state(); | |
93f0822d | 727 | |
6c1e4591 | 728 | intel_pstate_get_min_max(cpu, &min_perf, &max_perf); |
93f0822d | 729 | |
6c1e4591 | 730 | pstate = clamp_t(int, pstate, min_perf, max_perf); |
93f0822d | 731 | |
6c1e4591 DS |
732 | if (pstate == cpu->pstate.current_pstate) |
733 | return; | |
734 | } | |
b27580b0 | 735 | trace_cpu_frequency(pstate * cpu->pstate.scaling, cpu->cpu); |
35363e94 | 736 | |
93f0822d | 737 | cpu->pstate.current_pstate = pstate; |
93f0822d | 738 | |
007bea09 | 739 | pstate_funcs.set(cpu, pstate); |
93f0822d DB |
740 | } |
741 | ||
93f0822d DB |
742 | static void intel_pstate_get_cpu_pstates(struct cpudata *cpu) |
743 | { | |
016c8150 DB |
744 | cpu->pstate.min_pstate = pstate_funcs.get_min(); |
745 | cpu->pstate.max_pstate = pstate_funcs.get_max(); | |
746 | cpu->pstate.turbo_pstate = pstate_funcs.get_turbo(); | |
b27580b0 | 747 | cpu->pstate.scaling = pstate_funcs.get_scaling(); |
93f0822d | 748 | |
007bea09 DB |
749 | if (pstate_funcs.get_vid) |
750 | pstate_funcs.get_vid(cpu); | |
6c1e4591 | 751 | intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate, false); |
93f0822d DB |
752 | } |
753 | ||
6b17ddb2 | 754 | static inline void intel_pstate_calc_busy(struct cpudata *cpu) |
93f0822d | 755 | { |
6b17ddb2 | 756 | struct sample *sample = &cpu->sample; |
bf810222 | 757 | int64_t core_pct; |
93f0822d | 758 | |
bf810222 | 759 | core_pct = int_tofp(sample->aperf) * int_tofp(100); |
78e27086 | 760 | core_pct = div64_u64(core_pct, int_tofp(sample->mperf)); |
e66c1768 | 761 | |
fcb6a15c | 762 | sample->freq = fp_toint( |
b27580b0 DB |
763 | mul_fp(int_tofp( |
764 | cpu->pstate.max_pstate * cpu->pstate.scaling / 100), | |
765 | core_pct)); | |
fcb6a15c | 766 | |
bf810222 | 767 | sample->core_pct_busy = (int32_t)core_pct; |
93f0822d DB |
768 | } |
769 | ||
770 | static inline void intel_pstate_sample(struct cpudata *cpu) | |
771 | { | |
93f0822d | 772 | u64 aperf, mperf; |
4ab60c3f | 773 | unsigned long flags; |
4055fad3 | 774 | u64 tsc; |
93f0822d | 775 | |
4ab60c3f | 776 | local_irq_save(flags); |
93f0822d DB |
777 | rdmsrl(MSR_IA32_APERF, aperf); |
778 | rdmsrl(MSR_IA32_MPERF, mperf); | |
4ea1636b | 779 | tsc = rdtsc(); |
4ab60c3f | 780 | local_irq_restore(flags); |
b69880f9 | 781 | |
c4ee841f DB |
782 | cpu->last_sample_time = cpu->sample.time; |
783 | cpu->sample.time = ktime_get(); | |
d37e2b76 DB |
784 | cpu->sample.aperf = aperf; |
785 | cpu->sample.mperf = mperf; | |
4055fad3 | 786 | cpu->sample.tsc = tsc; |
d37e2b76 DB |
787 | cpu->sample.aperf -= cpu->prev_aperf; |
788 | cpu->sample.mperf -= cpu->prev_mperf; | |
4055fad3 | 789 | cpu->sample.tsc -= cpu->prev_tsc; |
1abc4b20 | 790 | |
6b17ddb2 | 791 | intel_pstate_calc_busy(cpu); |
93f0822d | 792 | |
93f0822d DB |
793 | cpu->prev_aperf = aperf; |
794 | cpu->prev_mperf = mperf; | |
4055fad3 | 795 | cpu->prev_tsc = tsc; |
93f0822d DB |
796 | } |
797 | ||
2f86dc4c DB |
798 | static inline void intel_hwp_set_sample_time(struct cpudata *cpu) |
799 | { | |
800 | int delay; | |
801 | ||
802 | delay = msecs_to_jiffies(50); | |
803 | mod_timer_pinned(&cpu->timer, jiffies + delay); | |
804 | } | |
805 | ||
93f0822d DB |
806 | static inline void intel_pstate_set_sample_time(struct cpudata *cpu) |
807 | { | |
abf013bf | 808 | int delay; |
93f0822d | 809 | |
abf013bf | 810 | delay = msecs_to_jiffies(pid_params.sample_rate_ms); |
93f0822d DB |
811 | mod_timer_pinned(&cpu->timer, jiffies + delay); |
812 | } | |
813 | ||
d253d2a5 | 814 | static inline int32_t intel_pstate_get_scaled_busy(struct cpudata *cpu) |
93f0822d | 815 | { |
c4ee841f | 816 | int32_t core_busy, max_pstate, current_pstate, sample_ratio; |
7180dddf | 817 | s64 duration_us; |
c4ee841f | 818 | u32 sample_time; |
93f0822d | 819 | |
e0d4c8f8 KCA |
820 | /* |
821 | * core_busy is the ratio of actual performance to max | |
822 | * max_pstate is the max non turbo pstate available | |
823 | * current_pstate was the pstate that was requested during | |
824 | * the last sample period. | |
825 | * | |
826 | * We normalize core_busy, which was our actual percent | |
827 | * performance to what we requested during the last sample | |
828 | * period. The result will be a percentage of busy at a | |
829 | * specified pstate. | |
830 | */ | |
d37e2b76 | 831 | core_busy = cpu->sample.core_pct_busy; |
2134ed4d | 832 | max_pstate = int_tofp(cpu->pstate.max_pstate); |
93f0822d | 833 | current_pstate = int_tofp(cpu->pstate.current_pstate); |
e66c1768 | 834 | core_busy = mul_fp(core_busy, div_fp(max_pstate, current_pstate)); |
c4ee841f | 835 | |
e0d4c8f8 KCA |
836 | /* |
837 | * Since we have a deferred timer, it will not fire unless | |
838 | * we are in C0. So, determine if the actual elapsed time | |
839 | * is significantly greater (3x) than our sample interval. If it | |
840 | * is, then we were idle for a long enough period of time | |
841 | * to adjust our busyness. | |
842 | */ | |
285cb990 | 843 | sample_time = pid_params.sample_rate_ms * USEC_PER_MSEC; |
7180dddf PB |
844 | duration_us = ktime_us_delta(cpu->sample.time, |
845 | cpu->last_sample_time); | |
c4ee841f DB |
846 | if (duration_us > sample_time * 3) { |
847 | sample_ratio = div_fp(int_tofp(sample_time), | |
c410833a | 848 | int_tofp(duration_us)); |
c4ee841f DB |
849 | core_busy = mul_fp(core_busy, sample_ratio); |
850 | } | |
851 | ||
f0fe3cd7 | 852 | return core_busy; |
93f0822d DB |
853 | } |
854 | ||
855 | static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu) | |
856 | { | |
d253d2a5 | 857 | int32_t busy_scaled; |
93f0822d | 858 | struct _pid *pid; |
4b707c89 | 859 | signed int ctl; |
4055fad3 DS |
860 | int from; |
861 | struct sample *sample; | |
862 | ||
863 | from = cpu->pstate.current_pstate; | |
93f0822d DB |
864 | |
865 | pid = &cpu->pid; | |
866 | busy_scaled = intel_pstate_get_scaled_busy(cpu); | |
867 | ||
868 | ctl = pid_calc(pid, busy_scaled); | |
869 | ||
4b707c89 | 870 | /* Negative values of ctl increase the pstate and vice versa */ |
6c1e4591 | 871 | intel_pstate_set_pstate(cpu, cpu->pstate.current_pstate - ctl, true); |
4055fad3 DS |
872 | |
873 | sample = &cpu->sample; | |
874 | trace_pstate_sample(fp_toint(sample->core_pct_busy), | |
875 | fp_toint(busy_scaled), | |
876 | from, | |
877 | cpu->pstate.current_pstate, | |
878 | sample->mperf, | |
879 | sample->aperf, | |
880 | sample->tsc, | |
881 | sample->freq); | |
93f0822d DB |
882 | } |
883 | ||
2f86dc4c DB |
884 | static void intel_hwp_timer_func(unsigned long __data) |
885 | { | |
886 | struct cpudata *cpu = (struct cpudata *) __data; | |
887 | ||
888 | intel_pstate_sample(cpu); | |
889 | intel_hwp_set_sample_time(cpu); | |
890 | } | |
891 | ||
93f0822d DB |
892 | static void intel_pstate_timer_func(unsigned long __data) |
893 | { | |
894 | struct cpudata *cpu = (struct cpudata *) __data; | |
895 | ||
896 | intel_pstate_sample(cpu); | |
b69880f9 | 897 | |
ca182aee | 898 | intel_pstate_adjust_busy_pstate(cpu); |
b69880f9 | 899 | |
93f0822d DB |
900 | intel_pstate_set_sample_time(cpu); |
901 | } | |
902 | ||
903 | #define ICPU(model, policy) \ | |
6cbd7ee1 DB |
904 | { X86_VENDOR_INTEL, 6, model, X86_FEATURE_APERFMPERF,\ |
905 | (unsigned long)&policy } | |
93f0822d DB |
906 | |
907 | static const struct x86_cpu_id intel_pstate_cpu_ids[] = { | |
016c8150 DB |
908 | ICPU(0x2a, core_params), |
909 | ICPU(0x2d, core_params), | |
19e77c28 | 910 | ICPU(0x37, byt_params), |
016c8150 DB |
911 | ICPU(0x3a, core_params), |
912 | ICPU(0x3c, core_params), | |
c7e241df | 913 | ICPU(0x3d, core_params), |
016c8150 DB |
914 | ICPU(0x3e, core_params), |
915 | ICPU(0x3f, core_params), | |
916 | ICPU(0x45, core_params), | |
917 | ICPU(0x46, core_params), | |
43f8a966 | 918 | ICPU(0x47, core_params), |
16405f98 | 919 | ICPU(0x4c, byt_params), |
7ab0256e | 920 | ICPU(0x4e, core_params), |
c7e241df | 921 | ICPU(0x4f, core_params), |
1c939123 | 922 | ICPU(0x5e, core_params), |
c7e241df | 923 | ICPU(0x56, core_params), |
b34ef932 | 924 | ICPU(0x57, knl_params), |
93f0822d DB |
925 | {} |
926 | }; | |
927 | MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids); | |
928 | ||
2f86dc4c DB |
929 | static const struct x86_cpu_id intel_pstate_cpu_oob_ids[] = { |
930 | ICPU(0x56, core_params), | |
931 | {} | |
932 | }; | |
933 | ||
93f0822d DB |
934 | static int intel_pstate_init_cpu(unsigned int cpunum) |
935 | { | |
93f0822d DB |
936 | struct cpudata *cpu; |
937 | ||
c0348717 DB |
938 | if (!all_cpu_data[cpunum]) |
939 | all_cpu_data[cpunum] = kzalloc(sizeof(struct cpudata), | |
940 | GFP_KERNEL); | |
93f0822d DB |
941 | if (!all_cpu_data[cpunum]) |
942 | return -ENOMEM; | |
943 | ||
944 | cpu = all_cpu_data[cpunum]; | |
945 | ||
93f0822d | 946 | cpu->cpu = cpunum; |
ba88d433 KCA |
947 | |
948 | if (hwp_active) | |
949 | intel_pstate_hwp_enable(cpu); | |
950 | ||
179e8471 | 951 | intel_pstate_get_cpu_pstates(cpu); |
016c8150 | 952 | |
93f0822d | 953 | init_timer_deferrable(&cpu->timer); |
2d8d1f18 | 954 | cpu->timer.data = (unsigned long)cpu; |
93f0822d | 955 | cpu->timer.expires = jiffies + HZ/100; |
2f86dc4c DB |
956 | |
957 | if (!hwp_active) | |
958 | cpu->timer.function = intel_pstate_timer_func; | |
959 | else | |
960 | cpu->timer.function = intel_hwp_timer_func; | |
961 | ||
93f0822d | 962 | intel_pstate_busy_pid_reset(cpu); |
93f0822d | 963 | intel_pstate_sample(cpu); |
93f0822d DB |
964 | |
965 | add_timer_on(&cpu->timer, cpunum); | |
966 | ||
f16255eb | 967 | pr_debug("intel_pstate: controlling: cpu %d\n", cpunum); |
93f0822d DB |
968 | |
969 | return 0; | |
970 | } | |
971 | ||
972 | static unsigned int intel_pstate_get(unsigned int cpu_num) | |
973 | { | |
974 | struct sample *sample; | |
975 | struct cpudata *cpu; | |
976 | ||
977 | cpu = all_cpu_data[cpu_num]; | |
978 | if (!cpu) | |
979 | return 0; | |
d37e2b76 | 980 | sample = &cpu->sample; |
93f0822d DB |
981 | return sample->freq; |
982 | } | |
983 | ||
984 | static int intel_pstate_set_policy(struct cpufreq_policy *policy) | |
985 | { | |
d3929b83 DB |
986 | if (!policy->cpuinfo.max_freq) |
987 | return -ENODEV; | |
988 | ||
630ec286 SP |
989 | if (policy->policy == CPUFREQ_POLICY_PERFORMANCE && |
990 | policy->max >= policy->cpuinfo.max_freq) { | |
a0475992 | 991 | limits.min_policy_pct = 100; |
93f0822d DB |
992 | limits.min_perf_pct = 100; |
993 | limits.min_perf = int_tofp(1); | |
36b4bed5 | 994 | limits.max_policy_pct = 100; |
93f0822d DB |
995 | limits.max_perf_pct = 100; |
996 | limits.max_perf = int_tofp(1); | |
4521e1a0 | 997 | limits.no_turbo = 0; |
d1b68485 | 998 | return 0; |
93f0822d | 999 | } |
2f86dc4c | 1000 | |
a0475992 KCA |
1001 | limits.min_policy_pct = (policy->min * 100) / policy->cpuinfo.max_freq; |
1002 | limits.min_policy_pct = clamp_t(int, limits.min_policy_pct, 0 , 100); | |
285cb990 | 1003 | limits.max_policy_pct = (policy->max * 100) / policy->cpuinfo.max_freq; |
d8f469e9 | 1004 | limits.max_policy_pct = clamp_t(int, limits.max_policy_pct, 0 , 100); |
43717aad CY |
1005 | |
1006 | /* Normalize user input to [min_policy_pct, max_policy_pct] */ | |
1007 | limits.min_perf_pct = max(limits.min_policy_pct, limits.min_sysfs_pct); | |
1008 | limits.min_perf_pct = min(limits.max_policy_pct, limits.min_perf_pct); | |
d8f469e9 | 1009 | limits.max_perf_pct = min(limits.max_policy_pct, limits.max_sysfs_pct); |
43717aad CY |
1010 | limits.max_perf_pct = max(limits.min_policy_pct, limits.max_perf_pct); |
1011 | ||
1012 | /* Make sure min_perf_pct <= max_perf_pct */ | |
1013 | limits.min_perf_pct = min(limits.max_perf_pct, limits.min_perf_pct); | |
1014 | ||
1015 | limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100)); | |
d1b68485 | 1016 | limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100)); |
93f0822d | 1017 | |
2f86dc4c DB |
1018 | if (hwp_active) |
1019 | intel_pstate_hwp_set(); | |
1020 | ||
93f0822d DB |
1021 | return 0; |
1022 | } | |
1023 | ||
1024 | static int intel_pstate_verify_policy(struct cpufreq_policy *policy) | |
1025 | { | |
be49e346 | 1026 | cpufreq_verify_within_cpu_limits(policy); |
93f0822d | 1027 | |
285cb990 | 1028 | if (policy->policy != CPUFREQ_POLICY_POWERSAVE && |
c410833a | 1029 | policy->policy != CPUFREQ_POLICY_PERFORMANCE) |
93f0822d DB |
1030 | return -EINVAL; |
1031 | ||
1032 | return 0; | |
1033 | } | |
1034 | ||
bb18008f | 1035 | static void intel_pstate_stop_cpu(struct cpufreq_policy *policy) |
93f0822d | 1036 | { |
bb18008f DB |
1037 | int cpu_num = policy->cpu; |
1038 | struct cpudata *cpu = all_cpu_data[cpu_num]; | |
93f0822d | 1039 | |
f16255eb | 1040 | pr_debug("intel_pstate: CPU %d exiting\n", cpu_num); |
bb18008f | 1041 | |
c2294a2f | 1042 | del_timer_sync(&all_cpu_data[cpu_num]->timer); |
2f86dc4c DB |
1043 | if (hwp_active) |
1044 | return; | |
1045 | ||
6c1e4591 | 1046 | intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate, false); |
93f0822d DB |
1047 | } |
1048 | ||
2760984f | 1049 | static int intel_pstate_cpu_init(struct cpufreq_policy *policy) |
93f0822d | 1050 | { |
93f0822d | 1051 | struct cpudata *cpu; |
52e0a509 | 1052 | int rc; |
93f0822d DB |
1053 | |
1054 | rc = intel_pstate_init_cpu(policy->cpu); | |
1055 | if (rc) | |
1056 | return rc; | |
1057 | ||
1058 | cpu = all_cpu_data[policy->cpu]; | |
1059 | ||
dd5fbf70 | 1060 | if (limits.min_perf_pct == 100 && limits.max_perf_pct == 100) |
93f0822d DB |
1061 | policy->policy = CPUFREQ_POLICY_PERFORMANCE; |
1062 | else | |
1063 | policy->policy = CPUFREQ_POLICY_POWERSAVE; | |
1064 | ||
b27580b0 DB |
1065 | policy->min = cpu->pstate.min_pstate * cpu->pstate.scaling; |
1066 | policy->max = cpu->pstate.turbo_pstate * cpu->pstate.scaling; | |
93f0822d DB |
1067 | |
1068 | /* cpuinfo and default policy values */ | |
b27580b0 DB |
1069 | policy->cpuinfo.min_freq = cpu->pstate.min_pstate * cpu->pstate.scaling; |
1070 | policy->cpuinfo.max_freq = | |
1071 | cpu->pstate.turbo_pstate * cpu->pstate.scaling; | |
93f0822d DB |
1072 | policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL; |
1073 | cpumask_set_cpu(policy->cpu, policy->cpus); | |
1074 | ||
1075 | return 0; | |
1076 | } | |
1077 | ||
1078 | static struct cpufreq_driver intel_pstate_driver = { | |
1079 | .flags = CPUFREQ_CONST_LOOPS, | |
1080 | .verify = intel_pstate_verify_policy, | |
1081 | .setpolicy = intel_pstate_set_policy, | |
1082 | .get = intel_pstate_get, | |
1083 | .init = intel_pstate_cpu_init, | |
bb18008f | 1084 | .stop_cpu = intel_pstate_stop_cpu, |
93f0822d | 1085 | .name = "intel_pstate", |
93f0822d DB |
1086 | }; |
1087 | ||
6be26498 | 1088 | static int __initdata no_load; |
2f86dc4c | 1089 | static int __initdata no_hwp; |
d64c3b0b | 1090 | static int __initdata hwp_only; |
aa4ea34d | 1091 | static unsigned int force_load; |
6be26498 | 1092 | |
b563b4e3 DB |
1093 | static int intel_pstate_msrs_not_valid(void) |
1094 | { | |
016c8150 | 1095 | if (!pstate_funcs.get_max() || |
c410833a SK |
1096 | !pstate_funcs.get_min() || |
1097 | !pstate_funcs.get_turbo()) | |
b563b4e3 DB |
1098 | return -ENODEV; |
1099 | ||
b563b4e3 DB |
1100 | return 0; |
1101 | } | |
016c8150 | 1102 | |
e0a261a2 | 1103 | static void copy_pid_params(struct pstate_adjust_policy *policy) |
016c8150 DB |
1104 | { |
1105 | pid_params.sample_rate_ms = policy->sample_rate_ms; | |
1106 | pid_params.p_gain_pct = policy->p_gain_pct; | |
1107 | pid_params.i_gain_pct = policy->i_gain_pct; | |
1108 | pid_params.d_gain_pct = policy->d_gain_pct; | |
1109 | pid_params.deadband = policy->deadband; | |
1110 | pid_params.setpoint = policy->setpoint; | |
1111 | } | |
1112 | ||
e0a261a2 | 1113 | static void copy_cpu_funcs(struct pstate_funcs *funcs) |
016c8150 DB |
1114 | { |
1115 | pstate_funcs.get_max = funcs->get_max; | |
1116 | pstate_funcs.get_min = funcs->get_min; | |
1117 | pstate_funcs.get_turbo = funcs->get_turbo; | |
b27580b0 | 1118 | pstate_funcs.get_scaling = funcs->get_scaling; |
016c8150 | 1119 | pstate_funcs.set = funcs->set; |
007bea09 | 1120 | pstate_funcs.get_vid = funcs->get_vid; |
016c8150 DB |
1121 | } |
1122 | ||
fbbcdc07 AH |
1123 | #if IS_ENABLED(CONFIG_ACPI) |
1124 | #include <acpi/processor.h> | |
1125 | ||
1126 | static bool intel_pstate_no_acpi_pss(void) | |
1127 | { | |
1128 | int i; | |
1129 | ||
1130 | for_each_possible_cpu(i) { | |
1131 | acpi_status status; | |
1132 | union acpi_object *pss; | |
1133 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
1134 | struct acpi_processor *pr = per_cpu(processors, i); | |
1135 | ||
1136 | if (!pr) | |
1137 | continue; | |
1138 | ||
1139 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); | |
1140 | if (ACPI_FAILURE(status)) | |
1141 | continue; | |
1142 | ||
1143 | pss = buffer.pointer; | |
1144 | if (pss && pss->type == ACPI_TYPE_PACKAGE) { | |
1145 | kfree(pss); | |
1146 | return false; | |
1147 | } | |
1148 | ||
1149 | kfree(pss); | |
1150 | } | |
1151 | ||
1152 | return true; | |
1153 | } | |
1154 | ||
966916ea | 1155 | static bool intel_pstate_has_acpi_ppc(void) |
1156 | { | |
1157 | int i; | |
1158 | ||
1159 | for_each_possible_cpu(i) { | |
1160 | struct acpi_processor *pr = per_cpu(processors, i); | |
1161 | ||
1162 | if (!pr) | |
1163 | continue; | |
1164 | if (acpi_has_method(pr->handle, "_PPC")) | |
1165 | return true; | |
1166 | } | |
1167 | return false; | |
1168 | } | |
1169 | ||
1170 | enum { | |
1171 | PSS, | |
1172 | PPC, | |
1173 | }; | |
1174 | ||
fbbcdc07 AH |
1175 | struct hw_vendor_info { |
1176 | u16 valid; | |
1177 | char oem_id[ACPI_OEM_ID_SIZE]; | |
1178 | char oem_table_id[ACPI_OEM_TABLE_ID_SIZE]; | |
966916ea | 1179 | int oem_pwr_table; |
fbbcdc07 AH |
1180 | }; |
1181 | ||
1182 | /* Hardware vendor-specific info that has its own power management modes */ | |
1183 | static struct hw_vendor_info vendor_info[] = { | |
966916ea | 1184 | {1, "HP ", "ProLiant", PSS}, |
1185 | {1, "ORACLE", "X4-2 ", PPC}, | |
1186 | {1, "ORACLE", "X4-2L ", PPC}, | |
1187 | {1, "ORACLE", "X4-2B ", PPC}, | |
1188 | {1, "ORACLE", "X3-2 ", PPC}, | |
1189 | {1, "ORACLE", "X3-2L ", PPC}, | |
1190 | {1, "ORACLE", "X3-2B ", PPC}, | |
1191 | {1, "ORACLE", "X4470M2 ", PPC}, | |
1192 | {1, "ORACLE", "X4270M3 ", PPC}, | |
1193 | {1, "ORACLE", "X4270M2 ", PPC}, | |
1194 | {1, "ORACLE", "X4170M2 ", PPC}, | |
5aecc3c8 EZ |
1195 | {1, "ORACLE", "X4170 M3", PPC}, |
1196 | {1, "ORACLE", "X4275 M3", PPC}, | |
1197 | {1, "ORACLE", "X6-2 ", PPC}, | |
1198 | {1, "ORACLE", "Sudbury ", PPC}, | |
fbbcdc07 AH |
1199 | {0, "", ""}, |
1200 | }; | |
1201 | ||
1202 | static bool intel_pstate_platform_pwr_mgmt_exists(void) | |
1203 | { | |
1204 | struct acpi_table_header hdr; | |
1205 | struct hw_vendor_info *v_info; | |
2f86dc4c DB |
1206 | const struct x86_cpu_id *id; |
1207 | u64 misc_pwr; | |
1208 | ||
1209 | id = x86_match_cpu(intel_pstate_cpu_oob_ids); | |
1210 | if (id) { | |
1211 | rdmsrl(MSR_MISC_PWR_MGMT, misc_pwr); | |
1212 | if ( misc_pwr & (1 << 8)) | |
1213 | return true; | |
1214 | } | |
fbbcdc07 | 1215 | |
c410833a SK |
1216 | if (acpi_disabled || |
1217 | ACPI_FAILURE(acpi_get_table_header(ACPI_SIG_FADT, 0, &hdr))) | |
fbbcdc07 AH |
1218 | return false; |
1219 | ||
1220 | for (v_info = vendor_info; v_info->valid; v_info++) { | |
c410833a | 1221 | if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) && |
966916ea | 1222 | !strncmp(hdr.oem_table_id, v_info->oem_table_id, |
1223 | ACPI_OEM_TABLE_ID_SIZE)) | |
1224 | switch (v_info->oem_pwr_table) { | |
1225 | case PSS: | |
1226 | return intel_pstate_no_acpi_pss(); | |
1227 | case PPC: | |
aa4ea34d EZ |
1228 | return intel_pstate_has_acpi_ppc() && |
1229 | (!force_load); | |
966916ea | 1230 | } |
fbbcdc07 AH |
1231 | } |
1232 | ||
1233 | return false; | |
1234 | } | |
1235 | #else /* CONFIG_ACPI not enabled */ | |
1236 | static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; } | |
966916ea | 1237 | static inline bool intel_pstate_has_acpi_ppc(void) { return false; } |
fbbcdc07 AH |
1238 | #endif /* CONFIG_ACPI */ |
1239 | ||
93f0822d DB |
1240 | static int __init intel_pstate_init(void) |
1241 | { | |
907cc908 | 1242 | int cpu, rc = 0; |
93f0822d | 1243 | const struct x86_cpu_id *id; |
64df1fdf | 1244 | struct cpu_defaults *cpu_def; |
93f0822d | 1245 | |
6be26498 DB |
1246 | if (no_load) |
1247 | return -ENODEV; | |
1248 | ||
93f0822d DB |
1249 | id = x86_match_cpu(intel_pstate_cpu_ids); |
1250 | if (!id) | |
1251 | return -ENODEV; | |
1252 | ||
fbbcdc07 AH |
1253 | /* |
1254 | * The Intel pstate driver will be ignored if the platform | |
1255 | * firmware has its own power management modes. | |
1256 | */ | |
1257 | if (intel_pstate_platform_pwr_mgmt_exists()) | |
1258 | return -ENODEV; | |
1259 | ||
64df1fdf | 1260 | cpu_def = (struct cpu_defaults *)id->driver_data; |
016c8150 | 1261 | |
64df1fdf BP |
1262 | copy_pid_params(&cpu_def->pid_policy); |
1263 | copy_cpu_funcs(&cpu_def->funcs); | |
016c8150 | 1264 | |
b563b4e3 DB |
1265 | if (intel_pstate_msrs_not_valid()) |
1266 | return -ENODEV; | |
1267 | ||
93f0822d DB |
1268 | pr_info("Intel P-state driver initializing.\n"); |
1269 | ||
b57ffac5 | 1270 | all_cpu_data = vzalloc(sizeof(void *) * num_possible_cpus()); |
93f0822d DB |
1271 | if (!all_cpu_data) |
1272 | return -ENOMEM; | |
93f0822d | 1273 | |
64df1fdf | 1274 | if (static_cpu_has_safe(X86_FEATURE_HWP) && !no_hwp) |
ba88d433 | 1275 | hwp_active++; |
2f86dc4c | 1276 | |
d64c3b0b KCA |
1277 | if (!hwp_active && hwp_only) |
1278 | goto out; | |
1279 | ||
93f0822d DB |
1280 | rc = cpufreq_register_driver(&intel_pstate_driver); |
1281 | if (rc) | |
1282 | goto out; | |
1283 | ||
1284 | intel_pstate_debug_expose_params(); | |
1285 | intel_pstate_sysfs_expose_params(); | |
b69880f9 | 1286 | |
93f0822d DB |
1287 | return rc; |
1288 | out: | |
907cc908 DB |
1289 | get_online_cpus(); |
1290 | for_each_online_cpu(cpu) { | |
1291 | if (all_cpu_data[cpu]) { | |
1292 | del_timer_sync(&all_cpu_data[cpu]->timer); | |
1293 | kfree(all_cpu_data[cpu]); | |
1294 | } | |
1295 | } | |
1296 | ||
1297 | put_online_cpus(); | |
1298 | vfree(all_cpu_data); | |
93f0822d DB |
1299 | return -ENODEV; |
1300 | } | |
1301 | device_initcall(intel_pstate_init); | |
1302 | ||
6be26498 DB |
1303 | static int __init intel_pstate_setup(char *str) |
1304 | { | |
1305 | if (!str) | |
1306 | return -EINVAL; | |
1307 | ||
1308 | if (!strcmp(str, "disable")) | |
1309 | no_load = 1; | |
2f86dc4c DB |
1310 | if (!strcmp(str, "no_hwp")) |
1311 | no_hwp = 1; | |
aa4ea34d EZ |
1312 | if (!strcmp(str, "force")) |
1313 | force_load = 1; | |
d64c3b0b KCA |
1314 | if (!strcmp(str, "hwp_only")) |
1315 | hwp_only = 1; | |
6be26498 DB |
1316 | return 0; |
1317 | } | |
1318 | early_param("intel_pstate", intel_pstate_setup); | |
1319 | ||
93f0822d DB |
1320 | MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>"); |
1321 | MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors"); | |
1322 | MODULE_LICENSE("GPL"); |