Commit | Line | Data |
---|---|---|
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 | |
f0fe3cd7 | 40 | #define FRAC_BITS 8 |
93f0822d DB |
41 | #define int_tofp(X) ((int64_t)(X) << FRAC_BITS) |
42 | #define fp_toint(X) ((X) >> FRAC_BITS) | |
f0fe3cd7 | 43 | |
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 | { | |
fa30dff9 | 52 | return div_s64((int64_t)x << FRAC_BITS, y); |
93f0822d DB |
53 | } |
54 | ||
d022a65e DB |
55 | static inline int ceiling_fp(int32_t x) |
56 | { | |
57 | int mask, ret; | |
58 | ||
59 | ret = fp_toint(x); | |
60 | mask = (1 << FRAC_BITS) - 1; | |
61 | if (x & mask) | |
62 | ret += 1; | |
63 | return ret; | |
64 | } | |
65 | ||
93f0822d | 66 | struct sample { |
d253d2a5 | 67 | int32_t core_pct_busy; |
93f0822d DB |
68 | u64 aperf; |
69 | u64 mperf; | |
70 | int freq; | |
c4ee841f | 71 | ktime_t time; |
93f0822d DB |
72 | }; |
73 | ||
74 | struct pstate_data { | |
75 | int current_pstate; | |
76 | int min_pstate; | |
77 | int max_pstate; | |
b27580b0 | 78 | int scaling; |
93f0822d DB |
79 | int turbo_pstate; |
80 | }; | |
81 | ||
007bea09 | 82 | struct vid_data { |
21855ff5 DB |
83 | int min; |
84 | int max; | |
85 | int turbo; | |
007bea09 DB |
86 | int32_t ratio; |
87 | }; | |
88 | ||
93f0822d DB |
89 | struct _pid { |
90 | int setpoint; | |
91 | int32_t integral; | |
92 | int32_t p_gain; | |
93 | int32_t i_gain; | |
94 | int32_t d_gain; | |
95 | int deadband; | |
d253d2a5 | 96 | int32_t last_err; |
93f0822d DB |
97 | }; |
98 | ||
99 | struct cpudata { | |
100 | int cpu; | |
101 | ||
93f0822d DB |
102 | struct timer_list timer; |
103 | ||
93f0822d | 104 | struct pstate_data pstate; |
007bea09 | 105 | struct vid_data vid; |
93f0822d | 106 | struct _pid pid; |
93f0822d | 107 | |
c4ee841f | 108 | ktime_t last_sample_time; |
93f0822d DB |
109 | u64 prev_aperf; |
110 | u64 prev_mperf; | |
d37e2b76 | 111 | struct sample sample; |
93f0822d DB |
112 | }; |
113 | ||
114 | static struct cpudata **all_cpu_data; | |
115 | struct pstate_adjust_policy { | |
116 | int sample_rate_ms; | |
117 | int deadband; | |
118 | int setpoint; | |
119 | int p_gain_pct; | |
120 | int d_gain_pct; | |
121 | int i_gain_pct; | |
122 | }; | |
123 | ||
016c8150 DB |
124 | struct pstate_funcs { |
125 | int (*get_max)(void); | |
126 | int (*get_min)(void); | |
127 | int (*get_turbo)(void); | |
b27580b0 | 128 | int (*get_scaling)(void); |
007bea09 DB |
129 | void (*set)(struct cpudata*, int pstate); |
130 | void (*get_vid)(struct cpudata *); | |
93f0822d DB |
131 | }; |
132 | ||
016c8150 DB |
133 | struct cpu_defaults { |
134 | struct pstate_adjust_policy pid_policy; | |
135 | struct pstate_funcs funcs; | |
93f0822d DB |
136 | }; |
137 | ||
016c8150 DB |
138 | static struct pstate_adjust_policy pid_params; |
139 | static struct pstate_funcs pstate_funcs; | |
2f86dc4c | 140 | static int hwp_active; |
016c8150 | 141 | |
93f0822d DB |
142 | struct perf_limits { |
143 | int no_turbo; | |
dd5fbf70 | 144 | int turbo_disabled; |
93f0822d DB |
145 | int max_perf_pct; |
146 | int min_perf_pct; | |
147 | int32_t max_perf; | |
148 | int32_t min_perf; | |
d8f469e9 DB |
149 | int max_policy_pct; |
150 | int max_sysfs_pct; | |
a0475992 KCA |
151 | int min_policy_pct; |
152 | int min_sysfs_pct; | |
93f0822d DB |
153 | }; |
154 | ||
155 | static struct perf_limits limits = { | |
156 | .no_turbo = 0, | |
4521e1a0 | 157 | .turbo_disabled = 0, |
93f0822d DB |
158 | .max_perf_pct = 100, |
159 | .max_perf = int_tofp(1), | |
160 | .min_perf_pct = 0, | |
161 | .min_perf = 0, | |
d8f469e9 DB |
162 | .max_policy_pct = 100, |
163 | .max_sysfs_pct = 100, | |
a0475992 KCA |
164 | .min_policy_pct = 0, |
165 | .min_sysfs_pct = 0, | |
93f0822d DB |
166 | }; |
167 | ||
168 | static inline void pid_reset(struct _pid *pid, int setpoint, int busy, | |
c410833a | 169 | int deadband, int integral) { |
93f0822d DB |
170 | pid->setpoint = setpoint; |
171 | pid->deadband = deadband; | |
172 | pid->integral = int_tofp(integral); | |
d98d099b | 173 | pid->last_err = int_tofp(setpoint) - int_tofp(busy); |
93f0822d DB |
174 | } |
175 | ||
176 | static inline void pid_p_gain_set(struct _pid *pid, int percent) | |
177 | { | |
178 | pid->p_gain = div_fp(int_tofp(percent), int_tofp(100)); | |
179 | } | |
180 | ||
181 | static inline void pid_i_gain_set(struct _pid *pid, int percent) | |
182 | { | |
183 | pid->i_gain = div_fp(int_tofp(percent), int_tofp(100)); | |
184 | } | |
185 | ||
186 | static inline void pid_d_gain_set(struct _pid *pid, int percent) | |
187 | { | |
93f0822d DB |
188 | pid->d_gain = div_fp(int_tofp(percent), int_tofp(100)); |
189 | } | |
190 | ||
d253d2a5 | 191 | static signed int pid_calc(struct _pid *pid, int32_t busy) |
93f0822d | 192 | { |
d253d2a5 | 193 | signed int result; |
93f0822d DB |
194 | int32_t pterm, dterm, fp_error; |
195 | int32_t integral_limit; | |
196 | ||
d253d2a5 | 197 | fp_error = int_tofp(pid->setpoint) - busy; |
93f0822d | 198 | |
d253d2a5 | 199 | if (abs(fp_error) <= int_tofp(pid->deadband)) |
93f0822d DB |
200 | return 0; |
201 | ||
202 | pterm = mul_fp(pid->p_gain, fp_error); | |
203 | ||
204 | pid->integral += fp_error; | |
205 | ||
e0d4c8f8 KCA |
206 | /* |
207 | * We limit the integral here so that it will never | |
208 | * get higher than 30. This prevents it from becoming | |
209 | * too large an input over long periods of time and allows | |
210 | * it to get factored out sooner. | |
211 | * | |
212 | * The value of 30 was chosen through experimentation. | |
213 | */ | |
93f0822d DB |
214 | integral_limit = int_tofp(30); |
215 | if (pid->integral > integral_limit) | |
216 | pid->integral = integral_limit; | |
217 | if (pid->integral < -integral_limit) | |
218 | pid->integral = -integral_limit; | |
219 | ||
d253d2a5 BS |
220 | dterm = mul_fp(pid->d_gain, fp_error - pid->last_err); |
221 | pid->last_err = fp_error; | |
93f0822d DB |
222 | |
223 | result = pterm + mul_fp(pid->integral, pid->i_gain) + dterm; | |
51d211e9 | 224 | result = result + (1 << (FRAC_BITS-1)); |
93f0822d DB |
225 | return (signed int)fp_toint(result); |
226 | } | |
227 | ||
228 | static inline void intel_pstate_busy_pid_reset(struct cpudata *cpu) | |
229 | { | |
016c8150 DB |
230 | pid_p_gain_set(&cpu->pid, pid_params.p_gain_pct); |
231 | pid_d_gain_set(&cpu->pid, pid_params.d_gain_pct); | |
232 | pid_i_gain_set(&cpu->pid, pid_params.i_gain_pct); | |
93f0822d | 233 | |
2d8d1f18 | 234 | pid_reset(&cpu->pid, pid_params.setpoint, 100, pid_params.deadband, 0); |
93f0822d DB |
235 | } |
236 | ||
93f0822d DB |
237 | static inline void intel_pstate_reset_all_pid(void) |
238 | { | |
239 | unsigned int cpu; | |
845c1cbe | 240 | |
93f0822d DB |
241 | for_each_online_cpu(cpu) { |
242 | if (all_cpu_data[cpu]) | |
243 | intel_pstate_busy_pid_reset(all_cpu_data[cpu]); | |
244 | } | |
245 | } | |
246 | ||
4521e1a0 GM |
247 | static inline void update_turbo_state(void) |
248 | { | |
249 | u64 misc_en; | |
250 | struct cpudata *cpu; | |
251 | ||
252 | cpu = all_cpu_data[0]; | |
253 | rdmsrl(MSR_IA32_MISC_ENABLE, misc_en); | |
254 | limits.turbo_disabled = | |
255 | (misc_en & MSR_IA32_MISC_ENABLE_TURBO_DISABLE || | |
256 | cpu->pstate.max_pstate == cpu->pstate.turbo_pstate); | |
257 | } | |
258 | ||
2f86dc4c DB |
259 | #define PCT_TO_HWP(x) (x * 255 / 100) |
260 | static void intel_pstate_hwp_set(void) | |
261 | { | |
262 | int min, max, cpu; | |
263 | u64 value, freq; | |
264 | ||
265 | get_online_cpus(); | |
266 | ||
267 | for_each_online_cpu(cpu) { | |
268 | rdmsrl_on_cpu(cpu, MSR_HWP_REQUEST, &value); | |
269 | min = PCT_TO_HWP(limits.min_perf_pct); | |
270 | value &= ~HWP_MIN_PERF(~0L); | |
271 | value |= HWP_MIN_PERF(min); | |
272 | ||
273 | max = PCT_TO_HWP(limits.max_perf_pct); | |
274 | if (limits.no_turbo) { | |
275 | rdmsrl( MSR_HWP_CAPABILITIES, freq); | |
276 | max = HWP_GUARANTEED_PERF(freq); | |
277 | } | |
278 | ||
279 | value &= ~HWP_MAX_PERF(~0L); | |
280 | value |= HWP_MAX_PERF(max); | |
281 | wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value); | |
282 | } | |
283 | ||
284 | put_online_cpus(); | |
285 | } | |
286 | ||
93f0822d DB |
287 | /************************** debugfs begin ************************/ |
288 | static int pid_param_set(void *data, u64 val) | |
289 | { | |
290 | *(u32 *)data = val; | |
291 | intel_pstate_reset_all_pid(); | |
292 | return 0; | |
293 | } | |
845c1cbe | 294 | |
93f0822d DB |
295 | static int pid_param_get(void *data, u64 *val) |
296 | { | |
297 | *val = *(u32 *)data; | |
298 | return 0; | |
299 | } | |
2d8d1f18 | 300 | DEFINE_SIMPLE_ATTRIBUTE(fops_pid_param, pid_param_get, pid_param_set, "%llu\n"); |
93f0822d DB |
301 | |
302 | struct pid_param { | |
303 | char *name; | |
304 | void *value; | |
305 | }; | |
306 | ||
307 | static struct pid_param pid_files[] = { | |
016c8150 DB |
308 | {"sample_rate_ms", &pid_params.sample_rate_ms}, |
309 | {"d_gain_pct", &pid_params.d_gain_pct}, | |
310 | {"i_gain_pct", &pid_params.i_gain_pct}, | |
311 | {"deadband", &pid_params.deadband}, | |
312 | {"setpoint", &pid_params.setpoint}, | |
313 | {"p_gain_pct", &pid_params.p_gain_pct}, | |
93f0822d DB |
314 | {NULL, NULL} |
315 | }; | |
316 | ||
317dd50e | 317 | static void __init intel_pstate_debug_expose_params(void) |
93f0822d | 318 | { |
317dd50e | 319 | struct dentry *debugfs_parent; |
93f0822d DB |
320 | int i = 0; |
321 | ||
2f86dc4c DB |
322 | if (hwp_active) |
323 | return; | |
93f0822d DB |
324 | debugfs_parent = debugfs_create_dir("pstate_snb", NULL); |
325 | if (IS_ERR_OR_NULL(debugfs_parent)) | |
326 | return; | |
327 | while (pid_files[i].name) { | |
328 | debugfs_create_file(pid_files[i].name, 0660, | |
c410833a SK |
329 | debugfs_parent, pid_files[i].value, |
330 | &fops_pid_param); | |
93f0822d DB |
331 | i++; |
332 | } | |
333 | } | |
334 | ||
335 | /************************** debugfs end ************************/ | |
336 | ||
337 | /************************** sysfs begin ************************/ | |
338 | #define show_one(file_name, object) \ | |
339 | static ssize_t show_##file_name \ | |
340 | (struct kobject *kobj, struct attribute *attr, char *buf) \ | |
341 | { \ | |
342 | return sprintf(buf, "%u\n", limits.object); \ | |
343 | } | |
344 | ||
d01b1f48 KCA |
345 | static ssize_t show_turbo_pct(struct kobject *kobj, |
346 | struct attribute *attr, char *buf) | |
347 | { | |
348 | struct cpudata *cpu; | |
349 | int total, no_turbo, turbo_pct; | |
350 | uint32_t turbo_fp; | |
351 | ||
352 | cpu = all_cpu_data[0]; | |
353 | ||
354 | total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1; | |
355 | no_turbo = cpu->pstate.max_pstate - cpu->pstate.min_pstate + 1; | |
356 | turbo_fp = div_fp(int_tofp(no_turbo), int_tofp(total)); | |
357 | turbo_pct = 100 - fp_toint(mul_fp(turbo_fp, int_tofp(100))); | |
358 | return sprintf(buf, "%u\n", turbo_pct); | |
359 | } | |
360 | ||
0522424e KCA |
361 | static ssize_t show_num_pstates(struct kobject *kobj, |
362 | struct attribute *attr, char *buf) | |
363 | { | |
364 | struct cpudata *cpu; | |
365 | int total; | |
366 | ||
367 | cpu = all_cpu_data[0]; | |
368 | total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1; | |
369 | return sprintf(buf, "%u\n", total); | |
370 | } | |
371 | ||
4521e1a0 GM |
372 | static ssize_t show_no_turbo(struct kobject *kobj, |
373 | struct attribute *attr, char *buf) | |
374 | { | |
375 | ssize_t ret; | |
376 | ||
377 | update_turbo_state(); | |
378 | if (limits.turbo_disabled) | |
379 | ret = sprintf(buf, "%u\n", limits.turbo_disabled); | |
380 | else | |
381 | ret = sprintf(buf, "%u\n", limits.no_turbo); | |
382 | ||
383 | return ret; | |
384 | } | |
385 | ||
93f0822d | 386 | static ssize_t store_no_turbo(struct kobject *a, struct attribute *b, |
c410833a | 387 | const char *buf, size_t count) |
93f0822d DB |
388 | { |
389 | unsigned int input; | |
390 | int ret; | |
845c1cbe | 391 | |
93f0822d DB |
392 | ret = sscanf(buf, "%u", &input); |
393 | if (ret != 1) | |
394 | return -EINVAL; | |
4521e1a0 GM |
395 | |
396 | update_turbo_state(); | |
dd5fbf70 DB |
397 | if (limits.turbo_disabled) { |
398 | pr_warn("Turbo disabled by BIOS or unavailable on processor\n"); | |
4521e1a0 | 399 | return -EPERM; |
dd5fbf70 | 400 | } |
2f86dc4c | 401 | |
4521e1a0 GM |
402 | limits.no_turbo = clamp_t(int, input, 0, 1); |
403 | ||
2f86dc4c DB |
404 | if (hwp_active) |
405 | intel_pstate_hwp_set(); | |
406 | ||
93f0822d DB |
407 | return count; |
408 | } | |
409 | ||
410 | static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b, | |
c410833a | 411 | const char *buf, size_t count) |
93f0822d DB |
412 | { |
413 | unsigned int input; | |
414 | int ret; | |
845c1cbe | 415 | |
93f0822d DB |
416 | ret = sscanf(buf, "%u", &input); |
417 | if (ret != 1) | |
418 | return -EINVAL; | |
419 | ||
d8f469e9 DB |
420 | limits.max_sysfs_pct = clamp_t(int, input, 0 , 100); |
421 | limits.max_perf_pct = min(limits.max_policy_pct, limits.max_sysfs_pct); | |
93f0822d | 422 | limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100)); |
845c1cbe | 423 | |
2f86dc4c DB |
424 | if (hwp_active) |
425 | intel_pstate_hwp_set(); | |
93f0822d DB |
426 | return count; |
427 | } | |
428 | ||
429 | static ssize_t store_min_perf_pct(struct kobject *a, struct attribute *b, | |
c410833a | 430 | const char *buf, size_t count) |
93f0822d DB |
431 | { |
432 | unsigned int input; | |
433 | int ret; | |
845c1cbe | 434 | |
93f0822d DB |
435 | ret = sscanf(buf, "%u", &input); |
436 | if (ret != 1) | |
437 | return -EINVAL; | |
a0475992 KCA |
438 | |
439 | limits.min_sysfs_pct = clamp_t(int, input, 0 , 100); | |
440 | limits.min_perf_pct = max(limits.min_policy_pct, limits.min_sysfs_pct); | |
93f0822d DB |
441 | limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100)); |
442 | ||
2f86dc4c DB |
443 | if (hwp_active) |
444 | intel_pstate_hwp_set(); | |
93f0822d DB |
445 | return count; |
446 | } | |
447 | ||
93f0822d DB |
448 | show_one(max_perf_pct, max_perf_pct); |
449 | show_one(min_perf_pct, min_perf_pct); | |
450 | ||
451 | define_one_global_rw(no_turbo); | |
452 | define_one_global_rw(max_perf_pct); | |
453 | define_one_global_rw(min_perf_pct); | |
d01b1f48 | 454 | define_one_global_ro(turbo_pct); |
0522424e | 455 | define_one_global_ro(num_pstates); |
93f0822d DB |
456 | |
457 | static struct attribute *intel_pstate_attributes[] = { | |
458 | &no_turbo.attr, | |
459 | &max_perf_pct.attr, | |
460 | &min_perf_pct.attr, | |
d01b1f48 | 461 | &turbo_pct.attr, |
0522424e | 462 | &num_pstates.attr, |
93f0822d DB |
463 | NULL |
464 | }; | |
465 | ||
466 | static struct attribute_group intel_pstate_attr_group = { | |
467 | .attrs = intel_pstate_attributes, | |
468 | }; | |
93f0822d | 469 | |
317dd50e | 470 | static void __init intel_pstate_sysfs_expose_params(void) |
93f0822d | 471 | { |
317dd50e | 472 | struct kobject *intel_pstate_kobject; |
93f0822d DB |
473 | int rc; |
474 | ||
475 | intel_pstate_kobject = kobject_create_and_add("intel_pstate", | |
476 | &cpu_subsys.dev_root->kobj); | |
477 | BUG_ON(!intel_pstate_kobject); | |
2d8d1f18 | 478 | rc = sysfs_create_group(intel_pstate_kobject, &intel_pstate_attr_group); |
93f0822d DB |
479 | BUG_ON(rc); |
480 | } | |
93f0822d | 481 | /************************** sysfs end ************************/ |
2f86dc4c DB |
482 | |
483 | static void intel_pstate_hwp_enable(void) | |
484 | { | |
485 | hwp_active++; | |
486 | pr_info("intel_pstate HWP enabled\n"); | |
487 | ||
488 | wrmsrl( MSR_PM_ENABLE, 0x1); | |
489 | } | |
490 | ||
19e77c28 DB |
491 | static int byt_get_min_pstate(void) |
492 | { | |
493 | u64 value; | |
845c1cbe | 494 | |
19e77c28 | 495 | rdmsrl(BYT_RATIOS, value); |
c16ed060 | 496 | return (value >> 8) & 0x7F; |
19e77c28 DB |
497 | } |
498 | ||
499 | static int byt_get_max_pstate(void) | |
500 | { | |
501 | u64 value; | |
845c1cbe | 502 | |
19e77c28 | 503 | rdmsrl(BYT_RATIOS, value); |
c16ed060 | 504 | return (value >> 16) & 0x7F; |
19e77c28 | 505 | } |
93f0822d | 506 | |
61d8d2ab DB |
507 | static int byt_get_turbo_pstate(void) |
508 | { | |
509 | u64 value; | |
845c1cbe | 510 | |
61d8d2ab | 511 | rdmsrl(BYT_TURBO_RATIOS, value); |
c16ed060 | 512 | return value & 0x7F; |
61d8d2ab DB |
513 | } |
514 | ||
007bea09 DB |
515 | static void byt_set_pstate(struct cpudata *cpudata, int pstate) |
516 | { | |
517 | u64 val; | |
518 | int32_t vid_fp; | |
519 | u32 vid; | |
520 | ||
521 | val = pstate << 8; | |
dd5fbf70 | 522 | if (limits.no_turbo && !limits.turbo_disabled) |
007bea09 DB |
523 | val |= (u64)1 << 32; |
524 | ||
525 | vid_fp = cpudata->vid.min + mul_fp( | |
526 | int_tofp(pstate - cpudata->pstate.min_pstate), | |
527 | cpudata->vid.ratio); | |
528 | ||
529 | vid_fp = clamp_t(int32_t, vid_fp, cpudata->vid.min, cpudata->vid.max); | |
d022a65e | 530 | vid = ceiling_fp(vid_fp); |
007bea09 | 531 | |
21855ff5 DB |
532 | if (pstate > cpudata->pstate.max_pstate) |
533 | vid = cpudata->vid.turbo; | |
534 | ||
007bea09 DB |
535 | val |= vid; |
536 | ||
537 | wrmsrl(MSR_IA32_PERF_CTL, val); | |
538 | } | |
539 | ||
b27580b0 DB |
540 | #define BYT_BCLK_FREQS 5 |
541 | static int byt_freq_table[BYT_BCLK_FREQS] = { 833, 1000, 1333, 1167, 800}; | |
542 | ||
543 | static int byt_get_scaling(void) | |
544 | { | |
545 | u64 value; | |
546 | int i; | |
547 | ||
548 | rdmsrl(MSR_FSB_FREQ, value); | |
549 | i = value & 0x3; | |
550 | ||
551 | BUG_ON(i > BYT_BCLK_FREQS); | |
552 | ||
553 | return byt_freq_table[i] * 100; | |
554 | } | |
555 | ||
007bea09 DB |
556 | static void byt_get_vid(struct cpudata *cpudata) |
557 | { | |
558 | u64 value; | |
559 | ||
560 | rdmsrl(BYT_VIDS, value); | |
c16ed060 DB |
561 | cpudata->vid.min = int_tofp((value >> 8) & 0x7f); |
562 | cpudata->vid.max = int_tofp((value >> 16) & 0x7f); | |
007bea09 DB |
563 | cpudata->vid.ratio = div_fp( |
564 | cpudata->vid.max - cpudata->vid.min, | |
565 | int_tofp(cpudata->pstate.max_pstate - | |
566 | cpudata->pstate.min_pstate)); | |
21855ff5 DB |
567 | |
568 | rdmsrl(BYT_TURBO_VIDS, value); | |
569 | cpudata->vid.turbo = value & 0x7f; | |
007bea09 DB |
570 | } |
571 | ||
016c8150 | 572 | static int core_get_min_pstate(void) |
93f0822d DB |
573 | { |
574 | u64 value; | |
845c1cbe | 575 | |
05e99c8c | 576 | rdmsrl(MSR_PLATFORM_INFO, value); |
93f0822d DB |
577 | return (value >> 40) & 0xFF; |
578 | } | |
579 | ||
016c8150 | 580 | static int core_get_max_pstate(void) |
93f0822d DB |
581 | { |
582 | u64 value; | |
845c1cbe | 583 | |
05e99c8c | 584 | rdmsrl(MSR_PLATFORM_INFO, value); |
93f0822d DB |
585 | return (value >> 8) & 0xFF; |
586 | } | |
587 | ||
016c8150 | 588 | static int core_get_turbo_pstate(void) |
93f0822d DB |
589 | { |
590 | u64 value; | |
591 | int nont, ret; | |
845c1cbe | 592 | |
05e99c8c | 593 | rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT, value); |
016c8150 | 594 | nont = core_get_max_pstate(); |
285cb990 | 595 | ret = (value) & 255; |
93f0822d DB |
596 | if (ret <= nont) |
597 | ret = nont; | |
598 | return ret; | |
599 | } | |
600 | ||
b27580b0 DB |
601 | static inline int core_get_scaling(void) |
602 | { | |
603 | return 100000; | |
604 | } | |
605 | ||
007bea09 | 606 | static void core_set_pstate(struct cpudata *cpudata, int pstate) |
016c8150 DB |
607 | { |
608 | u64 val; | |
609 | ||
610 | val = pstate << 8; | |
dd5fbf70 | 611 | if (limits.no_turbo && !limits.turbo_disabled) |
016c8150 DB |
612 | val |= (u64)1 << 32; |
613 | ||
bb18008f | 614 | wrmsrl_on_cpu(cpudata->cpu, MSR_IA32_PERF_CTL, val); |
016c8150 DB |
615 | } |
616 | ||
617 | static struct cpu_defaults core_params = { | |
618 | .pid_policy = { | |
619 | .sample_rate_ms = 10, | |
620 | .deadband = 0, | |
621 | .setpoint = 97, | |
622 | .p_gain_pct = 20, | |
623 | .d_gain_pct = 0, | |
624 | .i_gain_pct = 0, | |
625 | }, | |
626 | .funcs = { | |
627 | .get_max = core_get_max_pstate, | |
628 | .get_min = core_get_min_pstate, | |
629 | .get_turbo = core_get_turbo_pstate, | |
b27580b0 | 630 | .get_scaling = core_get_scaling, |
016c8150 DB |
631 | .set = core_set_pstate, |
632 | }, | |
633 | }; | |
634 | ||
19e77c28 DB |
635 | static struct cpu_defaults byt_params = { |
636 | .pid_policy = { | |
637 | .sample_rate_ms = 10, | |
638 | .deadband = 0, | |
639 | .setpoint = 97, | |
640 | .p_gain_pct = 14, | |
641 | .d_gain_pct = 0, | |
642 | .i_gain_pct = 4, | |
643 | }, | |
644 | .funcs = { | |
645 | .get_max = byt_get_max_pstate, | |
646 | .get_min = byt_get_min_pstate, | |
61d8d2ab | 647 | .get_turbo = byt_get_turbo_pstate, |
007bea09 | 648 | .set = byt_set_pstate, |
b27580b0 | 649 | .get_scaling = byt_get_scaling, |
007bea09 | 650 | .get_vid = byt_get_vid, |
19e77c28 DB |
651 | }, |
652 | }; | |
653 | ||
93f0822d DB |
654 | static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max) |
655 | { | |
656 | int max_perf = cpu->pstate.turbo_pstate; | |
7244cb62 | 657 | int max_perf_adj; |
93f0822d | 658 | int min_perf; |
845c1cbe | 659 | |
4521e1a0 | 660 | if (limits.no_turbo || limits.turbo_disabled) |
93f0822d DB |
661 | max_perf = cpu->pstate.max_pstate; |
662 | ||
e0d4c8f8 KCA |
663 | /* |
664 | * performance can be limited by user through sysfs, by cpufreq | |
665 | * policy, or by cpu specific default values determined through | |
666 | * experimentation. | |
667 | */ | |
7244cb62 DB |
668 | max_perf_adj = fp_toint(mul_fp(int_tofp(max_perf), limits.max_perf)); |
669 | *max = clamp_t(int, max_perf_adj, | |
93f0822d DB |
670 | cpu->pstate.min_pstate, cpu->pstate.turbo_pstate); |
671 | ||
672 | min_perf = fp_toint(mul_fp(int_tofp(max_perf), limits.min_perf)); | |
2d8d1f18 | 673 | *min = clamp_t(int, min_perf, cpu->pstate.min_pstate, max_perf); |
93f0822d DB |
674 | } |
675 | ||
676 | static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate) | |
677 | { | |
678 | int max_perf, min_perf; | |
679 | ||
4521e1a0 GM |
680 | update_turbo_state(); |
681 | ||
93f0822d DB |
682 | intel_pstate_get_min_max(cpu, &min_perf, &max_perf); |
683 | ||
684 | pstate = clamp_t(int, pstate, min_perf, max_perf); | |
685 | ||
686 | if (pstate == cpu->pstate.current_pstate) | |
687 | return; | |
688 | ||
b27580b0 | 689 | trace_cpu_frequency(pstate * cpu->pstate.scaling, cpu->cpu); |
35363e94 | 690 | |
93f0822d | 691 | cpu->pstate.current_pstate = pstate; |
93f0822d | 692 | |
007bea09 | 693 | pstate_funcs.set(cpu, pstate); |
93f0822d DB |
694 | } |
695 | ||
93f0822d DB |
696 | static void intel_pstate_get_cpu_pstates(struct cpudata *cpu) |
697 | { | |
016c8150 DB |
698 | cpu->pstate.min_pstate = pstate_funcs.get_min(); |
699 | cpu->pstate.max_pstate = pstate_funcs.get_max(); | |
700 | cpu->pstate.turbo_pstate = pstate_funcs.get_turbo(); | |
b27580b0 | 701 | cpu->pstate.scaling = pstate_funcs.get_scaling(); |
93f0822d | 702 | |
007bea09 DB |
703 | if (pstate_funcs.get_vid) |
704 | pstate_funcs.get_vid(cpu); | |
d40a63c4 | 705 | intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate); |
93f0822d DB |
706 | } |
707 | ||
6b17ddb2 | 708 | static inline void intel_pstate_calc_busy(struct cpudata *cpu) |
93f0822d | 709 | { |
6b17ddb2 | 710 | struct sample *sample = &cpu->sample; |
bf810222 | 711 | int64_t core_pct; |
93f0822d | 712 | |
bf810222 | 713 | core_pct = int_tofp(sample->aperf) * int_tofp(100); |
78e27086 | 714 | core_pct = div64_u64(core_pct, int_tofp(sample->mperf)); |
e66c1768 | 715 | |
fcb6a15c | 716 | sample->freq = fp_toint( |
b27580b0 DB |
717 | mul_fp(int_tofp( |
718 | cpu->pstate.max_pstate * cpu->pstate.scaling / 100), | |
719 | core_pct)); | |
fcb6a15c | 720 | |
bf810222 | 721 | sample->core_pct_busy = (int32_t)core_pct; |
93f0822d DB |
722 | } |
723 | ||
724 | static inline void intel_pstate_sample(struct cpudata *cpu) | |
725 | { | |
93f0822d | 726 | u64 aperf, mperf; |
4ab60c3f | 727 | unsigned long flags; |
93f0822d | 728 | |
4ab60c3f | 729 | local_irq_save(flags); |
93f0822d DB |
730 | rdmsrl(MSR_IA32_APERF, aperf); |
731 | rdmsrl(MSR_IA32_MPERF, mperf); | |
4ab60c3f | 732 | local_irq_restore(flags); |
b69880f9 | 733 | |
c4ee841f DB |
734 | cpu->last_sample_time = cpu->sample.time; |
735 | cpu->sample.time = ktime_get(); | |
d37e2b76 DB |
736 | cpu->sample.aperf = aperf; |
737 | cpu->sample.mperf = mperf; | |
d37e2b76 DB |
738 | cpu->sample.aperf -= cpu->prev_aperf; |
739 | cpu->sample.mperf -= cpu->prev_mperf; | |
1abc4b20 | 740 | |
6b17ddb2 | 741 | intel_pstate_calc_busy(cpu); |
93f0822d | 742 | |
93f0822d DB |
743 | cpu->prev_aperf = aperf; |
744 | cpu->prev_mperf = mperf; | |
745 | } | |
746 | ||
2f86dc4c DB |
747 | static inline void intel_hwp_set_sample_time(struct cpudata *cpu) |
748 | { | |
749 | int delay; | |
750 | ||
751 | delay = msecs_to_jiffies(50); | |
752 | mod_timer_pinned(&cpu->timer, jiffies + delay); | |
753 | } | |
754 | ||
93f0822d DB |
755 | static inline void intel_pstate_set_sample_time(struct cpudata *cpu) |
756 | { | |
abf013bf | 757 | int delay; |
93f0822d | 758 | |
abf013bf | 759 | delay = msecs_to_jiffies(pid_params.sample_rate_ms); |
93f0822d DB |
760 | mod_timer_pinned(&cpu->timer, jiffies + delay); |
761 | } | |
762 | ||
d253d2a5 | 763 | static inline int32_t intel_pstate_get_scaled_busy(struct cpudata *cpu) |
93f0822d | 764 | { |
c4ee841f DB |
765 | int32_t core_busy, max_pstate, current_pstate, sample_ratio; |
766 | u32 duration_us; | |
767 | u32 sample_time; | |
93f0822d | 768 | |
e0d4c8f8 KCA |
769 | /* |
770 | * core_busy is the ratio of actual performance to max | |
771 | * max_pstate is the max non turbo pstate available | |
772 | * current_pstate was the pstate that was requested during | |
773 | * the last sample period. | |
774 | * | |
775 | * We normalize core_busy, which was our actual percent | |
776 | * performance to what we requested during the last sample | |
777 | * period. The result will be a percentage of busy at a | |
778 | * specified pstate. | |
779 | */ | |
d37e2b76 | 780 | core_busy = cpu->sample.core_pct_busy; |
2134ed4d | 781 | max_pstate = int_tofp(cpu->pstate.max_pstate); |
93f0822d | 782 | current_pstate = int_tofp(cpu->pstate.current_pstate); |
e66c1768 | 783 | core_busy = mul_fp(core_busy, div_fp(max_pstate, current_pstate)); |
c4ee841f | 784 | |
e0d4c8f8 KCA |
785 | /* |
786 | * Since we have a deferred timer, it will not fire unless | |
787 | * we are in C0. So, determine if the actual elapsed time | |
788 | * is significantly greater (3x) than our sample interval. If it | |
789 | * is, then we were idle for a long enough period of time | |
790 | * to adjust our busyness. | |
791 | */ | |
285cb990 | 792 | sample_time = pid_params.sample_rate_ms * USEC_PER_MSEC; |
c4ee841f | 793 | duration_us = (u32) ktime_us_delta(cpu->sample.time, |
c410833a | 794 | cpu->last_sample_time); |
c4ee841f DB |
795 | if (duration_us > sample_time * 3) { |
796 | sample_ratio = div_fp(int_tofp(sample_time), | |
c410833a | 797 | int_tofp(duration_us)); |
c4ee841f DB |
798 | core_busy = mul_fp(core_busy, sample_ratio); |
799 | } | |
800 | ||
f0fe3cd7 | 801 | return core_busy; |
93f0822d DB |
802 | } |
803 | ||
804 | static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu) | |
805 | { | |
d253d2a5 | 806 | int32_t busy_scaled; |
93f0822d | 807 | struct _pid *pid; |
4b707c89 | 808 | signed int ctl; |
93f0822d DB |
809 | |
810 | pid = &cpu->pid; | |
811 | busy_scaled = intel_pstate_get_scaled_busy(cpu); | |
812 | ||
813 | ctl = pid_calc(pid, busy_scaled); | |
814 | ||
4b707c89 SK |
815 | /* Negative values of ctl increase the pstate and vice versa */ |
816 | intel_pstate_set_pstate(cpu, cpu->pstate.current_pstate - ctl); | |
93f0822d DB |
817 | } |
818 | ||
2f86dc4c DB |
819 | static void intel_hwp_timer_func(unsigned long __data) |
820 | { | |
821 | struct cpudata *cpu = (struct cpudata *) __data; | |
822 | ||
823 | intel_pstate_sample(cpu); | |
824 | intel_hwp_set_sample_time(cpu); | |
825 | } | |
826 | ||
93f0822d DB |
827 | static void intel_pstate_timer_func(unsigned long __data) |
828 | { | |
829 | struct cpudata *cpu = (struct cpudata *) __data; | |
b69880f9 | 830 | struct sample *sample; |
93f0822d DB |
831 | |
832 | intel_pstate_sample(cpu); | |
b69880f9 | 833 | |
d37e2b76 | 834 | sample = &cpu->sample; |
b69880f9 | 835 | |
ca182aee | 836 | intel_pstate_adjust_busy_pstate(cpu); |
b69880f9 DB |
837 | |
838 | trace_pstate_sample(fp_toint(sample->core_pct_busy), | |
839 | fp_toint(intel_pstate_get_scaled_busy(cpu)), | |
840 | cpu->pstate.current_pstate, | |
841 | sample->mperf, | |
842 | sample->aperf, | |
b69880f9 DB |
843 | sample->freq); |
844 | ||
93f0822d DB |
845 | intel_pstate_set_sample_time(cpu); |
846 | } | |
847 | ||
848 | #define ICPU(model, policy) \ | |
6cbd7ee1 DB |
849 | { X86_VENDOR_INTEL, 6, model, X86_FEATURE_APERFMPERF,\ |
850 | (unsigned long)&policy } | |
93f0822d DB |
851 | |
852 | static const struct x86_cpu_id intel_pstate_cpu_ids[] = { | |
016c8150 DB |
853 | ICPU(0x2a, core_params), |
854 | ICPU(0x2d, core_params), | |
19e77c28 | 855 | ICPU(0x37, byt_params), |
016c8150 DB |
856 | ICPU(0x3a, core_params), |
857 | ICPU(0x3c, core_params), | |
c7e241df | 858 | ICPU(0x3d, core_params), |
016c8150 DB |
859 | ICPU(0x3e, core_params), |
860 | ICPU(0x3f, core_params), | |
861 | ICPU(0x45, core_params), | |
862 | ICPU(0x46, core_params), | |
43f8a966 | 863 | ICPU(0x47, core_params), |
16405f98 | 864 | ICPU(0x4c, byt_params), |
7ab0256e | 865 | ICPU(0x4e, core_params), |
c7e241df DB |
866 | ICPU(0x4f, core_params), |
867 | ICPU(0x56, core_params), | |
93f0822d DB |
868 | {} |
869 | }; | |
870 | MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids); | |
871 | ||
2f86dc4c DB |
872 | static const struct x86_cpu_id intel_pstate_cpu_oob_ids[] = { |
873 | ICPU(0x56, core_params), | |
874 | {} | |
875 | }; | |
876 | ||
93f0822d DB |
877 | static int intel_pstate_init_cpu(unsigned int cpunum) |
878 | { | |
93f0822d DB |
879 | struct cpudata *cpu; |
880 | ||
c0348717 DB |
881 | if (!all_cpu_data[cpunum]) |
882 | all_cpu_data[cpunum] = kzalloc(sizeof(struct cpudata), | |
883 | GFP_KERNEL); | |
93f0822d DB |
884 | if (!all_cpu_data[cpunum]) |
885 | return -ENOMEM; | |
886 | ||
887 | cpu = all_cpu_data[cpunum]; | |
888 | ||
93f0822d | 889 | cpu->cpu = cpunum; |
179e8471 | 890 | intel_pstate_get_cpu_pstates(cpu); |
016c8150 | 891 | |
93f0822d | 892 | init_timer_deferrable(&cpu->timer); |
2d8d1f18 | 893 | cpu->timer.data = (unsigned long)cpu; |
93f0822d | 894 | cpu->timer.expires = jiffies + HZ/100; |
2f86dc4c DB |
895 | |
896 | if (!hwp_active) | |
897 | cpu->timer.function = intel_pstate_timer_func; | |
898 | else | |
899 | cpu->timer.function = intel_hwp_timer_func; | |
900 | ||
93f0822d | 901 | intel_pstate_busy_pid_reset(cpu); |
93f0822d | 902 | intel_pstate_sample(cpu); |
93f0822d DB |
903 | |
904 | add_timer_on(&cpu->timer, cpunum); | |
905 | ||
ce717613 | 906 | pr_debug("Intel pstate controlling: cpu %d\n", cpunum); |
93f0822d DB |
907 | |
908 | return 0; | |
909 | } | |
910 | ||
911 | static unsigned int intel_pstate_get(unsigned int cpu_num) | |
912 | { | |
913 | struct sample *sample; | |
914 | struct cpudata *cpu; | |
915 | ||
916 | cpu = all_cpu_data[cpu_num]; | |
917 | if (!cpu) | |
918 | return 0; | |
d37e2b76 | 919 | sample = &cpu->sample; |
93f0822d DB |
920 | return sample->freq; |
921 | } | |
922 | ||
923 | static int intel_pstate_set_policy(struct cpufreq_policy *policy) | |
924 | { | |
d3929b83 DB |
925 | if (!policy->cpuinfo.max_freq) |
926 | return -ENODEV; | |
927 | ||
630ec286 SP |
928 | if (policy->policy == CPUFREQ_POLICY_PERFORMANCE && |
929 | policy->max >= policy->cpuinfo.max_freq) { | |
a0475992 | 930 | limits.min_policy_pct = 100; |
93f0822d DB |
931 | limits.min_perf_pct = 100; |
932 | limits.min_perf = int_tofp(1); | |
36b4bed5 | 933 | limits.max_policy_pct = 100; |
93f0822d DB |
934 | limits.max_perf_pct = 100; |
935 | limits.max_perf = int_tofp(1); | |
4521e1a0 | 936 | limits.no_turbo = 0; |
d1b68485 | 937 | return 0; |
93f0822d | 938 | } |
2f86dc4c | 939 | |
a0475992 KCA |
940 | limits.min_policy_pct = (policy->min * 100) / policy->cpuinfo.max_freq; |
941 | limits.min_policy_pct = clamp_t(int, limits.min_policy_pct, 0 , 100); | |
942 | limits.min_perf_pct = max(limits.min_policy_pct, limits.min_sysfs_pct); | |
d1b68485 SP |
943 | limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100)); |
944 | ||
285cb990 | 945 | limits.max_policy_pct = (policy->max * 100) / policy->cpuinfo.max_freq; |
d8f469e9 DB |
946 | limits.max_policy_pct = clamp_t(int, limits.max_policy_pct, 0 , 100); |
947 | limits.max_perf_pct = min(limits.max_policy_pct, limits.max_sysfs_pct); | |
d1b68485 | 948 | limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100)); |
93f0822d | 949 | |
2f86dc4c DB |
950 | if (hwp_active) |
951 | intel_pstate_hwp_set(); | |
952 | ||
93f0822d DB |
953 | return 0; |
954 | } | |
955 | ||
956 | static int intel_pstate_verify_policy(struct cpufreq_policy *policy) | |
957 | { | |
be49e346 | 958 | cpufreq_verify_within_cpu_limits(policy); |
93f0822d | 959 | |
285cb990 | 960 | if (policy->policy != CPUFREQ_POLICY_POWERSAVE && |
c410833a | 961 | policy->policy != CPUFREQ_POLICY_PERFORMANCE) |
93f0822d DB |
962 | return -EINVAL; |
963 | ||
964 | return 0; | |
965 | } | |
966 | ||
bb18008f | 967 | static void intel_pstate_stop_cpu(struct cpufreq_policy *policy) |
93f0822d | 968 | { |
bb18008f DB |
969 | int cpu_num = policy->cpu; |
970 | struct cpudata *cpu = all_cpu_data[cpu_num]; | |
93f0822d | 971 | |
bb18008f DB |
972 | pr_info("intel_pstate CPU %d exiting\n", cpu_num); |
973 | ||
c2294a2f | 974 | del_timer_sync(&all_cpu_data[cpu_num]->timer); |
2f86dc4c DB |
975 | if (hwp_active) |
976 | return; | |
977 | ||
bb18008f | 978 | intel_pstate_set_pstate(cpu, cpu->pstate.min_pstate); |
93f0822d DB |
979 | } |
980 | ||
2760984f | 981 | static int intel_pstate_cpu_init(struct cpufreq_policy *policy) |
93f0822d | 982 | { |
93f0822d | 983 | struct cpudata *cpu; |
52e0a509 | 984 | int rc; |
93f0822d DB |
985 | |
986 | rc = intel_pstate_init_cpu(policy->cpu); | |
987 | if (rc) | |
988 | return rc; | |
989 | ||
990 | cpu = all_cpu_data[policy->cpu]; | |
991 | ||
dd5fbf70 | 992 | if (limits.min_perf_pct == 100 && limits.max_perf_pct == 100) |
93f0822d DB |
993 | policy->policy = CPUFREQ_POLICY_PERFORMANCE; |
994 | else | |
995 | policy->policy = CPUFREQ_POLICY_POWERSAVE; | |
996 | ||
b27580b0 DB |
997 | policy->min = cpu->pstate.min_pstate * cpu->pstate.scaling; |
998 | policy->max = cpu->pstate.turbo_pstate * cpu->pstate.scaling; | |
93f0822d DB |
999 | |
1000 | /* cpuinfo and default policy values */ | |
b27580b0 DB |
1001 | policy->cpuinfo.min_freq = cpu->pstate.min_pstate * cpu->pstate.scaling; |
1002 | policy->cpuinfo.max_freq = | |
1003 | cpu->pstate.turbo_pstate * cpu->pstate.scaling; | |
93f0822d DB |
1004 | policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL; |
1005 | cpumask_set_cpu(policy->cpu, policy->cpus); | |
1006 | ||
1007 | return 0; | |
1008 | } | |
1009 | ||
1010 | static struct cpufreq_driver intel_pstate_driver = { | |
1011 | .flags = CPUFREQ_CONST_LOOPS, | |
1012 | .verify = intel_pstate_verify_policy, | |
1013 | .setpolicy = intel_pstate_set_policy, | |
1014 | .get = intel_pstate_get, | |
1015 | .init = intel_pstate_cpu_init, | |
bb18008f | 1016 | .stop_cpu = intel_pstate_stop_cpu, |
93f0822d | 1017 | .name = "intel_pstate", |
93f0822d DB |
1018 | }; |
1019 | ||
6be26498 | 1020 | static int __initdata no_load; |
2f86dc4c | 1021 | static int __initdata no_hwp; |
d64c3b0b | 1022 | static int __initdata hwp_only; |
aa4ea34d | 1023 | static unsigned int force_load; |
6be26498 | 1024 | |
b563b4e3 DB |
1025 | static int intel_pstate_msrs_not_valid(void) |
1026 | { | |
1027 | /* Check that all the msr's we are using are valid. */ | |
1028 | u64 aperf, mperf, tmp; | |
1029 | ||
1030 | rdmsrl(MSR_IA32_APERF, aperf); | |
1031 | rdmsrl(MSR_IA32_MPERF, mperf); | |
1032 | ||
016c8150 | 1033 | if (!pstate_funcs.get_max() || |
c410833a SK |
1034 | !pstate_funcs.get_min() || |
1035 | !pstate_funcs.get_turbo()) | |
b563b4e3 DB |
1036 | return -ENODEV; |
1037 | ||
1038 | rdmsrl(MSR_IA32_APERF, tmp); | |
1039 | if (!(tmp - aperf)) | |
1040 | return -ENODEV; | |
1041 | ||
1042 | rdmsrl(MSR_IA32_MPERF, tmp); | |
1043 | if (!(tmp - mperf)) | |
1044 | return -ENODEV; | |
1045 | ||
1046 | return 0; | |
1047 | } | |
016c8150 | 1048 | |
e0a261a2 | 1049 | static void copy_pid_params(struct pstate_adjust_policy *policy) |
016c8150 DB |
1050 | { |
1051 | pid_params.sample_rate_ms = policy->sample_rate_ms; | |
1052 | pid_params.p_gain_pct = policy->p_gain_pct; | |
1053 | pid_params.i_gain_pct = policy->i_gain_pct; | |
1054 | pid_params.d_gain_pct = policy->d_gain_pct; | |
1055 | pid_params.deadband = policy->deadband; | |
1056 | pid_params.setpoint = policy->setpoint; | |
1057 | } | |
1058 | ||
e0a261a2 | 1059 | static void copy_cpu_funcs(struct pstate_funcs *funcs) |
016c8150 DB |
1060 | { |
1061 | pstate_funcs.get_max = funcs->get_max; | |
1062 | pstate_funcs.get_min = funcs->get_min; | |
1063 | pstate_funcs.get_turbo = funcs->get_turbo; | |
b27580b0 | 1064 | pstate_funcs.get_scaling = funcs->get_scaling; |
016c8150 | 1065 | pstate_funcs.set = funcs->set; |
007bea09 | 1066 | pstate_funcs.get_vid = funcs->get_vid; |
016c8150 DB |
1067 | } |
1068 | ||
fbbcdc07 AH |
1069 | #if IS_ENABLED(CONFIG_ACPI) |
1070 | #include <acpi/processor.h> | |
1071 | ||
1072 | static bool intel_pstate_no_acpi_pss(void) | |
1073 | { | |
1074 | int i; | |
1075 | ||
1076 | for_each_possible_cpu(i) { | |
1077 | acpi_status status; | |
1078 | union acpi_object *pss; | |
1079 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
1080 | struct acpi_processor *pr = per_cpu(processors, i); | |
1081 | ||
1082 | if (!pr) | |
1083 | continue; | |
1084 | ||
1085 | status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer); | |
1086 | if (ACPI_FAILURE(status)) | |
1087 | continue; | |
1088 | ||
1089 | pss = buffer.pointer; | |
1090 | if (pss && pss->type == ACPI_TYPE_PACKAGE) { | |
1091 | kfree(pss); | |
1092 | return false; | |
1093 | } | |
1094 | ||
1095 | kfree(pss); | |
1096 | } | |
1097 | ||
1098 | return true; | |
1099 | } | |
1100 | ||
966916ea | 1101 | static bool intel_pstate_has_acpi_ppc(void) |
1102 | { | |
1103 | int i; | |
1104 | ||
1105 | for_each_possible_cpu(i) { | |
1106 | struct acpi_processor *pr = per_cpu(processors, i); | |
1107 | ||
1108 | if (!pr) | |
1109 | continue; | |
1110 | if (acpi_has_method(pr->handle, "_PPC")) | |
1111 | return true; | |
1112 | } | |
1113 | return false; | |
1114 | } | |
1115 | ||
1116 | enum { | |
1117 | PSS, | |
1118 | PPC, | |
1119 | }; | |
1120 | ||
fbbcdc07 AH |
1121 | struct hw_vendor_info { |
1122 | u16 valid; | |
1123 | char oem_id[ACPI_OEM_ID_SIZE]; | |
1124 | char oem_table_id[ACPI_OEM_TABLE_ID_SIZE]; | |
966916ea | 1125 | int oem_pwr_table; |
fbbcdc07 AH |
1126 | }; |
1127 | ||
1128 | /* Hardware vendor-specific info that has its own power management modes */ | |
1129 | static struct hw_vendor_info vendor_info[] = { | |
966916ea | 1130 | {1, "HP ", "ProLiant", PSS}, |
1131 | {1, "ORACLE", "X4-2 ", PPC}, | |
1132 | {1, "ORACLE", "X4-2L ", PPC}, | |
1133 | {1, "ORACLE", "X4-2B ", PPC}, | |
1134 | {1, "ORACLE", "X3-2 ", PPC}, | |
1135 | {1, "ORACLE", "X3-2L ", PPC}, | |
1136 | {1, "ORACLE", "X3-2B ", PPC}, | |
1137 | {1, "ORACLE", "X4470M2 ", PPC}, | |
1138 | {1, "ORACLE", "X4270M3 ", PPC}, | |
1139 | {1, "ORACLE", "X4270M2 ", PPC}, | |
1140 | {1, "ORACLE", "X4170M2 ", PPC}, | |
fbbcdc07 AH |
1141 | {0, "", ""}, |
1142 | }; | |
1143 | ||
1144 | static bool intel_pstate_platform_pwr_mgmt_exists(void) | |
1145 | { | |
1146 | struct acpi_table_header hdr; | |
1147 | struct hw_vendor_info *v_info; | |
2f86dc4c DB |
1148 | const struct x86_cpu_id *id; |
1149 | u64 misc_pwr; | |
1150 | ||
1151 | id = x86_match_cpu(intel_pstate_cpu_oob_ids); | |
1152 | if (id) { | |
1153 | rdmsrl(MSR_MISC_PWR_MGMT, misc_pwr); | |
1154 | if ( misc_pwr & (1 << 8)) | |
1155 | return true; | |
1156 | } | |
fbbcdc07 | 1157 | |
c410833a SK |
1158 | if (acpi_disabled || |
1159 | ACPI_FAILURE(acpi_get_table_header(ACPI_SIG_FADT, 0, &hdr))) | |
fbbcdc07 AH |
1160 | return false; |
1161 | ||
1162 | for (v_info = vendor_info; v_info->valid; v_info++) { | |
c410833a | 1163 | if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) && |
966916ea | 1164 | !strncmp(hdr.oem_table_id, v_info->oem_table_id, |
1165 | ACPI_OEM_TABLE_ID_SIZE)) | |
1166 | switch (v_info->oem_pwr_table) { | |
1167 | case PSS: | |
1168 | return intel_pstate_no_acpi_pss(); | |
1169 | case PPC: | |
aa4ea34d EZ |
1170 | return intel_pstate_has_acpi_ppc() && |
1171 | (!force_load); | |
966916ea | 1172 | } |
fbbcdc07 AH |
1173 | } |
1174 | ||
1175 | return false; | |
1176 | } | |
1177 | #else /* CONFIG_ACPI not enabled */ | |
1178 | static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; } | |
966916ea | 1179 | static inline bool intel_pstate_has_acpi_ppc(void) { return false; } |
fbbcdc07 AH |
1180 | #endif /* CONFIG_ACPI */ |
1181 | ||
93f0822d DB |
1182 | static int __init intel_pstate_init(void) |
1183 | { | |
907cc908 | 1184 | int cpu, rc = 0; |
93f0822d | 1185 | const struct x86_cpu_id *id; |
016c8150 | 1186 | struct cpu_defaults *cpu_info; |
2f86dc4c | 1187 | struct cpuinfo_x86 *c = &boot_cpu_data; |
93f0822d | 1188 | |
6be26498 DB |
1189 | if (no_load) |
1190 | return -ENODEV; | |
1191 | ||
93f0822d DB |
1192 | id = x86_match_cpu(intel_pstate_cpu_ids); |
1193 | if (!id) | |
1194 | return -ENODEV; | |
1195 | ||
fbbcdc07 AH |
1196 | /* |
1197 | * The Intel pstate driver will be ignored if the platform | |
1198 | * firmware has its own power management modes. | |
1199 | */ | |
1200 | if (intel_pstate_platform_pwr_mgmt_exists()) | |
1201 | return -ENODEV; | |
1202 | ||
016c8150 DB |
1203 | cpu_info = (struct cpu_defaults *)id->driver_data; |
1204 | ||
1205 | copy_pid_params(&cpu_info->pid_policy); | |
1206 | copy_cpu_funcs(&cpu_info->funcs); | |
1207 | ||
b563b4e3 DB |
1208 | if (intel_pstate_msrs_not_valid()) |
1209 | return -ENODEV; | |
1210 | ||
93f0822d DB |
1211 | pr_info("Intel P-state driver initializing.\n"); |
1212 | ||
b57ffac5 | 1213 | all_cpu_data = vzalloc(sizeof(void *) * num_possible_cpus()); |
93f0822d DB |
1214 | if (!all_cpu_data) |
1215 | return -ENOMEM; | |
93f0822d | 1216 | |
2f86dc4c DB |
1217 | if (cpu_has(c,X86_FEATURE_HWP) && !no_hwp) |
1218 | intel_pstate_hwp_enable(); | |
1219 | ||
d64c3b0b KCA |
1220 | if (!hwp_active && hwp_only) |
1221 | goto out; | |
1222 | ||
93f0822d DB |
1223 | rc = cpufreq_register_driver(&intel_pstate_driver); |
1224 | if (rc) | |
1225 | goto out; | |
1226 | ||
1227 | intel_pstate_debug_expose_params(); | |
1228 | intel_pstate_sysfs_expose_params(); | |
b69880f9 | 1229 | |
93f0822d DB |
1230 | return rc; |
1231 | out: | |
907cc908 DB |
1232 | get_online_cpus(); |
1233 | for_each_online_cpu(cpu) { | |
1234 | if (all_cpu_data[cpu]) { | |
1235 | del_timer_sync(&all_cpu_data[cpu]->timer); | |
1236 | kfree(all_cpu_data[cpu]); | |
1237 | } | |
1238 | } | |
1239 | ||
1240 | put_online_cpus(); | |
1241 | vfree(all_cpu_data); | |
93f0822d DB |
1242 | return -ENODEV; |
1243 | } | |
1244 | device_initcall(intel_pstate_init); | |
1245 | ||
6be26498 DB |
1246 | static int __init intel_pstate_setup(char *str) |
1247 | { | |
1248 | if (!str) | |
1249 | return -EINVAL; | |
1250 | ||
1251 | if (!strcmp(str, "disable")) | |
1252 | no_load = 1; | |
2f86dc4c DB |
1253 | if (!strcmp(str, "no_hwp")) |
1254 | no_hwp = 1; | |
aa4ea34d EZ |
1255 | if (!strcmp(str, "force")) |
1256 | force_load = 1; | |
d64c3b0b KCA |
1257 | if (!strcmp(str, "hwp_only")) |
1258 | hwp_only = 1; | |
6be26498 DB |
1259 | return 0; |
1260 | } | |
1261 | early_param("intel_pstate", intel_pstate_setup); | |
1262 | ||
93f0822d DB |
1263 | MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>"); |
1264 | MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors"); | |
1265 | MODULE_LICENSE("GPL"); |