blob: e908161059216b286123948d3de3405da450d3b8 [file] [log] [blame]
Dirk Brandewie93f08222013-02-06 09:02:13 -08001/*
Srinivas Pandruvadad1b68482013-04-09 22:38:18 +00002 * intel_pstate.c: Native P state management for Intel processors
Dirk Brandewie93f08222013-02-06 09:02:13 -08003 *
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>
Adrian Huangfbbcdc02013-10-31 23:24:05 +080028#include <linux/acpi.h>
Dirk Brandewie93f08222013-02-06 09:02:13 -080029#include <trace/events/power.h>
30
31#include <asm/div64.h>
32#include <asm/msr.h>
33#include <asm/cpu_device_id.h>
34
35#define SAMPLE_COUNT 3
36
Dirk Brandewie61d8d2a2014-02-12 10:01:07 -080037#define BYT_RATIOS 0x66a
38#define BYT_VIDS 0x66b
39#define BYT_TURBO_RATIOS 0x66c
40
Dirk Brandewie19e77c22013-10-21 09:20:35 -070041
Dirk Brandewie93f08222013-02-06 09:02:13 -080042#define FRAC_BITS 8
43#define int_tofp(X) ((int64_t)(X) << FRAC_BITS)
44#define fp_toint(X) ((X) >> FRAC_BITS)
45
46static inline int32_t mul_fp(int32_t x, int32_t y)
47{
48 return ((int64_t)x * (int64_t)y) >> FRAC_BITS;
49}
50
51static inline int32_t div_fp(int32_t x, int32_t y)
52{
53 return div_s64((int64_t)x << FRAC_BITS, (int64_t)y);
54}
55
56struct sample {
Brennan Shacklettd253d2a2013-10-21 09:20:32 -070057 int32_t core_pct_busy;
Dirk Brandewie93f08222013-02-06 09:02:13 -080058 u64 aperf;
59 u64 mperf;
Dirk Brandewiefcb6a152014-02-03 08:55:31 -080060 unsigned long long tsc;
Dirk Brandewie93f08222013-02-06 09:02:13 -080061 int freq;
62};
63
64struct pstate_data {
65 int current_pstate;
66 int min_pstate;
67 int max_pstate;
68 int turbo_pstate;
69};
70
Dirk Brandewie007bea02013-12-18 10:32:39 -080071struct vid_data {
72 int32_t min;
73 int32_t max;
74 int32_t ratio;
75};
76
Dirk Brandewie93f08222013-02-06 09:02:13 -080077struct _pid {
78 int setpoint;
79 int32_t integral;
80 int32_t p_gain;
81 int32_t i_gain;
82 int32_t d_gain;
83 int deadband;
Brennan Shacklettd253d2a2013-10-21 09:20:32 -070084 int32_t last_err;
Dirk Brandewie93f08222013-02-06 09:02:13 -080085};
86
87struct cpudata {
88 int cpu;
89
90 char name[64];
91
92 struct timer_list timer;
93
Dirk Brandewie93f08222013-02-06 09:02:13 -080094 struct pstate_data pstate;
Dirk Brandewie007bea02013-12-18 10:32:39 -080095 struct vid_data vid;
Dirk Brandewie93f08222013-02-06 09:02:13 -080096 struct _pid pid;
Dirk Brandewie93f08222013-02-06 09:02:13 -080097
Dirk Brandewie93f08222013-02-06 09:02:13 -080098 u64 prev_aperf;
99 u64 prev_mperf;
Dirk Brandewiefcb6a152014-02-03 08:55:31 -0800100 unsigned long long prev_tsc;
Dirk Brandewie93f08222013-02-06 09:02:13 -0800101 int sample_ptr;
102 struct sample samples[SAMPLE_COUNT];
103};
104
105static struct cpudata **all_cpu_data;
106struct pstate_adjust_policy {
107 int sample_rate_ms;
108 int deadband;
109 int setpoint;
110 int p_gain_pct;
111 int d_gain_pct;
112 int i_gain_pct;
113};
114
Dirk Brandewie016c8152013-10-21 09:20:34 -0700115struct pstate_funcs {
116 int (*get_max)(void);
117 int (*get_min)(void);
118 int (*get_turbo)(void);
Dirk Brandewie007bea02013-12-18 10:32:39 -0800119 void (*set)(struct cpudata*, int pstate);
120 void (*get_vid)(struct cpudata *);
Dirk Brandewie93f08222013-02-06 09:02:13 -0800121};
122
Dirk Brandewie016c8152013-10-21 09:20:34 -0700123struct cpu_defaults {
124 struct pstate_adjust_policy pid_policy;
125 struct pstate_funcs funcs;
126};
127
128static struct pstate_adjust_policy pid_params;
129static struct pstate_funcs pstate_funcs;
130
Dirk Brandewie93f08222013-02-06 09:02:13 -0800131struct perf_limits {
132 int no_turbo;
133 int max_perf_pct;
134 int min_perf_pct;
135 int32_t max_perf;
136 int32_t min_perf;
Dirk Brandewied8f469e2013-05-07 08:20:26 -0700137 int max_policy_pct;
138 int max_sysfs_pct;
Dirk Brandewie93f08222013-02-06 09:02:13 -0800139};
140
141static struct perf_limits limits = {
142 .no_turbo = 0,
143 .max_perf_pct = 100,
144 .max_perf = int_tofp(1),
145 .min_perf_pct = 0,
146 .min_perf = 0,
Dirk Brandewied8f469e2013-05-07 08:20:26 -0700147 .max_policy_pct = 100,
148 .max_sysfs_pct = 100,
Dirk Brandewie93f08222013-02-06 09:02:13 -0800149};
150
151static inline void pid_reset(struct _pid *pid, int setpoint, int busy,
152 int deadband, int integral) {
153 pid->setpoint = setpoint;
154 pid->deadband = deadband;
155 pid->integral = int_tofp(integral);
156 pid->last_err = setpoint - busy;
157}
158
159static inline void pid_p_gain_set(struct _pid *pid, int percent)
160{
161 pid->p_gain = div_fp(int_tofp(percent), int_tofp(100));
162}
163
164static inline void pid_i_gain_set(struct _pid *pid, int percent)
165{
166 pid->i_gain = div_fp(int_tofp(percent), int_tofp(100));
167}
168
169static inline void pid_d_gain_set(struct _pid *pid, int percent)
170{
171
172 pid->d_gain = div_fp(int_tofp(percent), int_tofp(100));
173}
174
Brennan Shacklettd253d2a2013-10-21 09:20:32 -0700175static signed int pid_calc(struct _pid *pid, int32_t busy)
Dirk Brandewie93f08222013-02-06 09:02:13 -0800176{
Brennan Shacklettd253d2a2013-10-21 09:20:32 -0700177 signed int result;
Dirk Brandewie93f08222013-02-06 09:02:13 -0800178 int32_t pterm, dterm, fp_error;
179 int32_t integral_limit;
180
Brennan Shacklettd253d2a2013-10-21 09:20:32 -0700181 fp_error = int_tofp(pid->setpoint) - busy;
Dirk Brandewie93f08222013-02-06 09:02:13 -0800182
Brennan Shacklettd253d2a2013-10-21 09:20:32 -0700183 if (abs(fp_error) <= int_tofp(pid->deadband))
Dirk Brandewie93f08222013-02-06 09:02:13 -0800184 return 0;
185
186 pterm = mul_fp(pid->p_gain, fp_error);
187
188 pid->integral += fp_error;
189
190 /* limit the integral term */
191 integral_limit = int_tofp(30);
192 if (pid->integral > integral_limit)
193 pid->integral = integral_limit;
194 if (pid->integral < -integral_limit)
195 pid->integral = -integral_limit;
196
Brennan Shacklettd253d2a2013-10-21 09:20:32 -0700197 dterm = mul_fp(pid->d_gain, fp_error - pid->last_err);
198 pid->last_err = fp_error;
Dirk Brandewie93f08222013-02-06 09:02:13 -0800199
200 result = pterm + mul_fp(pid->integral, pid->i_gain) + dterm;
201
202 return (signed int)fp_toint(result);
203}
204
205static inline void intel_pstate_busy_pid_reset(struct cpudata *cpu)
206{
Dirk Brandewie016c8152013-10-21 09:20:34 -0700207 pid_p_gain_set(&cpu->pid, pid_params.p_gain_pct);
208 pid_d_gain_set(&cpu->pid, pid_params.d_gain_pct);
209 pid_i_gain_set(&cpu->pid, pid_params.i_gain_pct);
Dirk Brandewie93f08222013-02-06 09:02:13 -0800210
211 pid_reset(&cpu->pid,
Dirk Brandewie016c8152013-10-21 09:20:34 -0700212 pid_params.setpoint,
Dirk Brandewie93f08222013-02-06 09:02:13 -0800213 100,
Dirk Brandewie016c8152013-10-21 09:20:34 -0700214 pid_params.deadband,
Dirk Brandewie93f08222013-02-06 09:02:13 -0800215 0);
216}
217
Dirk Brandewie93f08222013-02-06 09:02:13 -0800218static inline void intel_pstate_reset_all_pid(void)
219{
220 unsigned int cpu;
221 for_each_online_cpu(cpu) {
222 if (all_cpu_data[cpu])
223 intel_pstate_busy_pid_reset(all_cpu_data[cpu]);
224 }
225}
226
227/************************** debugfs begin ************************/
228static int pid_param_set(void *data, u64 val)
229{
230 *(u32 *)data = val;
231 intel_pstate_reset_all_pid();
232 return 0;
233}
234static int pid_param_get(void *data, u64 *val)
235{
236 *val = *(u32 *)data;
237 return 0;
238}
239DEFINE_SIMPLE_ATTRIBUTE(fops_pid_param, pid_param_get,
240 pid_param_set, "%llu\n");
241
242struct pid_param {
243 char *name;
244 void *value;
245};
246
247static struct pid_param pid_files[] = {
Dirk Brandewie016c8152013-10-21 09:20:34 -0700248 {"sample_rate_ms", &pid_params.sample_rate_ms},
249 {"d_gain_pct", &pid_params.d_gain_pct},
250 {"i_gain_pct", &pid_params.i_gain_pct},
251 {"deadband", &pid_params.deadband},
252 {"setpoint", &pid_params.setpoint},
253 {"p_gain_pct", &pid_params.p_gain_pct},
Dirk Brandewie93f08222013-02-06 09:02:13 -0800254 {NULL, NULL}
255};
256
257static struct dentry *debugfs_parent;
258static void intel_pstate_debug_expose_params(void)
259{
260 int i = 0;
261
262 debugfs_parent = debugfs_create_dir("pstate_snb", NULL);
263 if (IS_ERR_OR_NULL(debugfs_parent))
264 return;
265 while (pid_files[i].name) {
266 debugfs_create_file(pid_files[i].name, 0660,
267 debugfs_parent, pid_files[i].value,
268 &fops_pid_param);
269 i++;
270 }
271}
272
273/************************** debugfs end ************************/
274
275/************************** sysfs begin ************************/
276#define show_one(file_name, object) \
277 static ssize_t show_##file_name \
278 (struct kobject *kobj, struct attribute *attr, char *buf) \
279 { \
280 return sprintf(buf, "%u\n", limits.object); \
281 }
282
283static ssize_t store_no_turbo(struct kobject *a, struct attribute *b,
284 const char *buf, size_t count)
285{
286 unsigned int input;
287 int ret;
288 ret = sscanf(buf, "%u", &input);
289 if (ret != 1)
290 return -EINVAL;
291 limits.no_turbo = clamp_t(int, input, 0 , 1);
292
293 return count;
294}
295
296static ssize_t store_max_perf_pct(struct kobject *a, struct attribute *b,
297 const char *buf, size_t count)
298{
299 unsigned int input;
300 int ret;
301 ret = sscanf(buf, "%u", &input);
302 if (ret != 1)
303 return -EINVAL;
304
Dirk Brandewied8f469e2013-05-07 08:20:26 -0700305 limits.max_sysfs_pct = clamp_t(int, input, 0 , 100);
306 limits.max_perf_pct = min(limits.max_policy_pct, limits.max_sysfs_pct);
Dirk Brandewie93f08222013-02-06 09:02:13 -0800307 limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100));
308 return count;
309}
310
311static ssize_t store_min_perf_pct(struct kobject *a, struct attribute *b,
312 const char *buf, size_t count)
313{
314 unsigned int input;
315 int ret;
316 ret = sscanf(buf, "%u", &input);
317 if (ret != 1)
318 return -EINVAL;
319 limits.min_perf_pct = clamp_t(int, input, 0 , 100);
320 limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100));
321
322 return count;
323}
324
325show_one(no_turbo, no_turbo);
326show_one(max_perf_pct, max_perf_pct);
327show_one(min_perf_pct, min_perf_pct);
328
329define_one_global_rw(no_turbo);
330define_one_global_rw(max_perf_pct);
331define_one_global_rw(min_perf_pct);
332
333static struct attribute *intel_pstate_attributes[] = {
334 &no_turbo.attr,
335 &max_perf_pct.attr,
336 &min_perf_pct.attr,
337 NULL
338};
339
340static struct attribute_group intel_pstate_attr_group = {
341 .attrs = intel_pstate_attributes,
342};
343static struct kobject *intel_pstate_kobject;
344
345static void intel_pstate_sysfs_expose_params(void)
346{
347 int rc;
348
349 intel_pstate_kobject = kobject_create_and_add("intel_pstate",
350 &cpu_subsys.dev_root->kobj);
351 BUG_ON(!intel_pstate_kobject);
352 rc = sysfs_create_group(intel_pstate_kobject,
353 &intel_pstate_attr_group);
354 BUG_ON(rc);
355}
356
357/************************** sysfs end ************************/
Dirk Brandewie19e77c22013-10-21 09:20:35 -0700358static int byt_get_min_pstate(void)
359{
360 u64 value;
361 rdmsrl(BYT_RATIOS, value);
Dirk Brandewie4042e752014-02-12 10:01:06 -0800362 return (value >> 8) & 0xFF;
Dirk Brandewie19e77c22013-10-21 09:20:35 -0700363}
Dirk Brandewie93f08222013-02-06 09:02:13 -0800364
Dirk Brandewie19e77c22013-10-21 09:20:35 -0700365static int byt_get_max_pstate(void)
366{
367 u64 value;
368 rdmsrl(BYT_RATIOS, value);
369 return (value >> 16) & 0xFF;
370}
371
Dirk Brandewie61d8d2a2014-02-12 10:01:07 -0800372static int byt_get_turbo_pstate(void)
373{
374 u64 value;
375 rdmsrl(BYT_TURBO_RATIOS, value);
376 return value & 0x3F;
377}
378
Dirk Brandewie007bea02013-12-18 10:32:39 -0800379static void byt_set_pstate(struct cpudata *cpudata, int pstate)
380{
381 u64 val;
382 int32_t vid_fp;
383 u32 vid;
384
385 val = pstate << 8;
386 if (limits.no_turbo)
387 val |= (u64)1 << 32;
388
389 vid_fp = cpudata->vid.min + mul_fp(
390 int_tofp(pstate - cpudata->pstate.min_pstate),
391 cpudata->vid.ratio);
392
393 vid_fp = clamp_t(int32_t, vid_fp, cpudata->vid.min, cpudata->vid.max);
394 vid = fp_toint(vid_fp);
395
396 val |= vid;
397
398 wrmsrl(MSR_IA32_PERF_CTL, val);
399}
400
401static void byt_get_vid(struct cpudata *cpudata)
402{
403 u64 value;
404
405 rdmsrl(BYT_VIDS, value);
406 cpudata->vid.min = int_tofp((value >> 8) & 0x7f);
407 cpudata->vid.max = int_tofp((value >> 16) & 0x7f);
408 cpudata->vid.ratio = div_fp(
409 cpudata->vid.max - cpudata->vid.min,
410 int_tofp(cpudata->pstate.max_pstate -
411 cpudata->pstate.min_pstate));
412}
413
414
Dirk Brandewie016c8152013-10-21 09:20:34 -0700415static int core_get_min_pstate(void)
Dirk Brandewie93f08222013-02-06 09:02:13 -0800416{
417 u64 value;
Konrad Rzeszutek Wilk05e99c8cf2013-03-20 14:21:10 +0000418 rdmsrl(MSR_PLATFORM_INFO, value);
Dirk Brandewie93f08222013-02-06 09:02:13 -0800419 return (value >> 40) & 0xFF;
420}
421
Dirk Brandewie016c8152013-10-21 09:20:34 -0700422static int core_get_max_pstate(void)
Dirk Brandewie93f08222013-02-06 09:02:13 -0800423{
424 u64 value;
Konrad Rzeszutek Wilk05e99c8cf2013-03-20 14:21:10 +0000425 rdmsrl(MSR_PLATFORM_INFO, value);
Dirk Brandewie93f08222013-02-06 09:02:13 -0800426 return (value >> 8) & 0xFF;
427}
428
Dirk Brandewie016c8152013-10-21 09:20:34 -0700429static int core_get_turbo_pstate(void)
Dirk Brandewie93f08222013-02-06 09:02:13 -0800430{
431 u64 value;
432 int nont, ret;
Konrad Rzeszutek Wilk05e99c8cf2013-03-20 14:21:10 +0000433 rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT, value);
Dirk Brandewie016c8152013-10-21 09:20:34 -0700434 nont = core_get_max_pstate();
Dirk Brandewie93f08222013-02-06 09:02:13 -0800435 ret = ((value) & 255);
436 if (ret <= nont)
437 ret = nont;
438 return ret;
439}
440
Dirk Brandewie007bea02013-12-18 10:32:39 -0800441static void core_set_pstate(struct cpudata *cpudata, int pstate)
Dirk Brandewie016c8152013-10-21 09:20:34 -0700442{
443 u64 val;
444
445 val = pstate << 8;
446 if (limits.no_turbo)
447 val |= (u64)1 << 32;
448
449 wrmsrl(MSR_IA32_PERF_CTL, val);
450}
451
452static struct cpu_defaults core_params = {
453 .pid_policy = {
454 .sample_rate_ms = 10,
455 .deadband = 0,
456 .setpoint = 97,
457 .p_gain_pct = 20,
458 .d_gain_pct = 0,
459 .i_gain_pct = 0,
460 },
461 .funcs = {
462 .get_max = core_get_max_pstate,
463 .get_min = core_get_min_pstate,
464 .get_turbo = core_get_turbo_pstate,
465 .set = core_set_pstate,
466 },
467};
468
Dirk Brandewie19e77c22013-10-21 09:20:35 -0700469static struct cpu_defaults byt_params = {
470 .pid_policy = {
471 .sample_rate_ms = 10,
472 .deadband = 0,
473 .setpoint = 97,
474 .p_gain_pct = 14,
475 .d_gain_pct = 0,
476 .i_gain_pct = 4,
477 },
478 .funcs = {
479 .get_max = byt_get_max_pstate,
480 .get_min = byt_get_min_pstate,
Dirk Brandewie61d8d2a2014-02-12 10:01:07 -0800481 .get_turbo = byt_get_turbo_pstate,
Dirk Brandewie007bea02013-12-18 10:32:39 -0800482 .set = byt_set_pstate,
483 .get_vid = byt_get_vid,
Dirk Brandewie19e77c22013-10-21 09:20:35 -0700484 },
485};
486
487
Dirk Brandewie93f08222013-02-06 09:02:13 -0800488static void intel_pstate_get_min_max(struct cpudata *cpu, int *min, int *max)
489{
490 int max_perf = cpu->pstate.turbo_pstate;
Dirk Brandewie7244cb62013-10-21 09:20:33 -0700491 int max_perf_adj;
Dirk Brandewie93f08222013-02-06 09:02:13 -0800492 int min_perf;
493 if (limits.no_turbo)
494 max_perf = cpu->pstate.max_pstate;
495
Dirk Brandewie7244cb62013-10-21 09:20:33 -0700496 max_perf_adj = fp_toint(mul_fp(int_tofp(max_perf), limits.max_perf));
497 *max = clamp_t(int, max_perf_adj,
Dirk Brandewie93f08222013-02-06 09:02:13 -0800498 cpu->pstate.min_pstate, cpu->pstate.turbo_pstate);
499
500 min_perf = fp_toint(mul_fp(int_tofp(max_perf), limits.min_perf));
501 *min = clamp_t(int, min_perf,
502 cpu->pstate.min_pstate, max_perf);
503}
504
505static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate)
506{
507 int max_perf, min_perf;
508
509 intel_pstate_get_min_max(cpu, &min_perf, &max_perf);
510
511 pstate = clamp_t(int, pstate, min_perf, max_perf);
512
513 if (pstate == cpu->pstate.current_pstate)
514 return;
515
Dirk Brandewie93f08222013-02-06 09:02:13 -0800516 trace_cpu_frequency(pstate * 100000, cpu->cpu);
Dirk Brandewie35363e92013-05-07 08:20:30 -0700517
Dirk Brandewie93f08222013-02-06 09:02:13 -0800518 cpu->pstate.current_pstate = pstate;
Dirk Brandewie93f08222013-02-06 09:02:13 -0800519
Dirk Brandewie007bea02013-12-18 10:32:39 -0800520 pstate_funcs.set(cpu, pstate);
Dirk Brandewie93f08222013-02-06 09:02:13 -0800521}
522
523static inline void intel_pstate_pstate_increase(struct cpudata *cpu, int steps)
524{
525 int target;
526 target = cpu->pstate.current_pstate + steps;
527
528 intel_pstate_set_pstate(cpu, target);
529}
530
531static inline void intel_pstate_pstate_decrease(struct cpudata *cpu, int steps)
532{
533 int target;
534 target = cpu->pstate.current_pstate - steps;
535 intel_pstate_set_pstate(cpu, target);
536}
537
538static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
539{
540 sprintf(cpu->name, "Intel 2nd generation core");
541
Dirk Brandewie016c8152013-10-21 09:20:34 -0700542 cpu->pstate.min_pstate = pstate_funcs.get_min();
543 cpu->pstate.max_pstate = pstate_funcs.get_max();
544 cpu->pstate.turbo_pstate = pstate_funcs.get_turbo();
Dirk Brandewie93f08222013-02-06 09:02:13 -0800545
Dirk Brandewie007bea02013-12-18 10:32:39 -0800546 if (pstate_funcs.get_vid)
547 pstate_funcs.get_vid(cpu);
548
Dirk Brandewie93f08222013-02-06 09:02:13 -0800549 /*
550 * goto max pstate so we don't slow up boot if we are built-in if we are
551 * a module we will take care of it during normal operation
552 */
553 intel_pstate_set_pstate(cpu, cpu->pstate.max_pstate);
554}
555
556static inline void intel_pstate_calc_busy(struct cpudata *cpu,
557 struct sample *sample)
558{
559 u64 core_pct;
Dirk Brandewiefcb6a152014-02-03 08:55:31 -0800560 u64 c0_pct;
Dirk Brandewie93f08222013-02-06 09:02:13 -0800561
Dirk Brandewiefcb6a152014-02-03 08:55:31 -0800562 core_pct = div64_u64(sample->aperf * 100, sample->mperf);
563
564 c0_pct = div64_u64(sample->mperf * 100, sample->tsc);
565 sample->freq = fp_toint(
566 mul_fp(int_tofp(cpu->pstate.max_pstate),
567 int_tofp(core_pct * 1000)));
568
569 sample->core_pct_busy = mul_fp(int_tofp(core_pct),
570 div_fp(int_tofp(c0_pct + 1), int_tofp(100)));
Dirk Brandewie93f08222013-02-06 09:02:13 -0800571}
572
573static inline void intel_pstate_sample(struct cpudata *cpu)
574{
Dirk Brandewie93f08222013-02-06 09:02:13 -0800575 u64 aperf, mperf;
Dirk Brandewiefcb6a152014-02-03 08:55:31 -0800576 unsigned long long tsc;
Dirk Brandewie93f08222013-02-06 09:02:13 -0800577
Dirk Brandewie93f08222013-02-06 09:02:13 -0800578 rdmsrl(MSR_IA32_APERF, aperf);
579 rdmsrl(MSR_IA32_MPERF, mperf);
Dirk Brandewiefcb6a152014-02-03 08:55:31 -0800580 tsc = native_read_tsc();
Dirk Brandewieb69880f2014-01-16 10:32:25 -0800581
Dirk Brandewie1abc4b22013-05-07 08:20:25 -0700582 cpu->sample_ptr = (cpu->sample_ptr + 1) % SAMPLE_COUNT;
583 cpu->samples[cpu->sample_ptr].aperf = aperf;
584 cpu->samples[cpu->sample_ptr].mperf = mperf;
Dirk Brandewiefcb6a152014-02-03 08:55:31 -0800585 cpu->samples[cpu->sample_ptr].tsc = tsc;
Dirk Brandewie1abc4b22013-05-07 08:20:25 -0700586 cpu->samples[cpu->sample_ptr].aperf -= cpu->prev_aperf;
587 cpu->samples[cpu->sample_ptr].mperf -= cpu->prev_mperf;
Dirk Brandewiefcb6a152014-02-03 08:55:31 -0800588 cpu->samples[cpu->sample_ptr].tsc -= cpu->prev_tsc;
Dirk Brandewie93f08222013-02-06 09:02:13 -0800589
Dirk Brandewie1abc4b22013-05-07 08:20:25 -0700590 intel_pstate_calc_busy(cpu, &cpu->samples[cpu->sample_ptr]);
Dirk Brandewie93f08222013-02-06 09:02:13 -0800591
Dirk Brandewie93f08222013-02-06 09:02:13 -0800592 cpu->prev_aperf = aperf;
593 cpu->prev_mperf = mperf;
Dirk Brandewiefcb6a152014-02-03 08:55:31 -0800594 cpu->prev_tsc = tsc;
Dirk Brandewie93f08222013-02-06 09:02:13 -0800595}
596
597static inline void intel_pstate_set_sample_time(struct cpudata *cpu)
598{
599 int sample_time, delay;
600
Dirk Brandewie016c8152013-10-21 09:20:34 -0700601 sample_time = pid_params.sample_rate_ms;
Dirk Brandewie93f08222013-02-06 09:02:13 -0800602 delay = msecs_to_jiffies(sample_time);
Dirk Brandewie93f08222013-02-06 09:02:13 -0800603 mod_timer_pinned(&cpu->timer, jiffies + delay);
604}
605
Brennan Shacklettd253d2a2013-10-21 09:20:32 -0700606static inline int32_t intel_pstate_get_scaled_busy(struct cpudata *cpu)
Dirk Brandewie93f08222013-02-06 09:02:13 -0800607{
Dirk Brandewie2134ed42013-07-18 08:48:42 -0700608 int32_t core_busy, max_pstate, current_pstate;
Dirk Brandewie93f08222013-02-06 09:02:13 -0800609
Brennan Shacklettd253d2a2013-10-21 09:20:32 -0700610 core_busy = cpu->samples[cpu->sample_ptr].core_pct_busy;
Dirk Brandewie2134ed42013-07-18 08:48:42 -0700611 max_pstate = int_tofp(cpu->pstate.max_pstate);
Dirk Brandewie93f08222013-02-06 09:02:13 -0800612 current_pstate = int_tofp(cpu->pstate.current_pstate);
Brennan Shacklettd253d2a2013-10-21 09:20:32 -0700613 return mul_fp(core_busy, div_fp(max_pstate, current_pstate));
Dirk Brandewie93f08222013-02-06 09:02:13 -0800614}
615
616static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu)
617{
Brennan Shacklettd253d2a2013-10-21 09:20:32 -0700618 int32_t busy_scaled;
Dirk Brandewie93f08222013-02-06 09:02:13 -0800619 struct _pid *pid;
620 signed int ctl = 0;
621 int steps;
622
623 pid = &cpu->pid;
624 busy_scaled = intel_pstate_get_scaled_busy(cpu);
625
626 ctl = pid_calc(pid, busy_scaled);
627
628 steps = abs(ctl);
Dirk Brandewieb69880f2014-01-16 10:32:25 -0800629
Dirk Brandewie93f08222013-02-06 09:02:13 -0800630 if (ctl < 0)
631 intel_pstate_pstate_increase(cpu, steps);
632 else
633 intel_pstate_pstate_decrease(cpu, steps);
634}
635
Dirk Brandewie93f08222013-02-06 09:02:13 -0800636static void intel_pstate_timer_func(unsigned long __data)
637{
638 struct cpudata *cpu = (struct cpudata *) __data;
Dirk Brandewieb69880f2014-01-16 10:32:25 -0800639 struct sample *sample;
Dirk Brandewie93f08222013-02-06 09:02:13 -0800640
641 intel_pstate_sample(cpu);
Dirk Brandewieb69880f2014-01-16 10:32:25 -0800642
643 sample = &cpu->samples[cpu->sample_ptr];
Dirk Brandewieb69880f2014-01-16 10:32:25 -0800644
Dirk Brandewieca182ae2013-05-07 08:20:27 -0700645 intel_pstate_adjust_busy_pstate(cpu);
Dirk Brandewieb69880f2014-01-16 10:32:25 -0800646
647 trace_pstate_sample(fp_toint(sample->core_pct_busy),
648 fp_toint(intel_pstate_get_scaled_busy(cpu)),
649 cpu->pstate.current_pstate,
650 sample->mperf,
651 sample->aperf,
Dirk Brandewieb69880f2014-01-16 10:32:25 -0800652 sample->freq);
653
Dirk Brandewie93f08222013-02-06 09:02:13 -0800654 intel_pstate_set_sample_time(cpu);
655}
656
657#define ICPU(model, policy) \
Dirk Brandewie6cbd7ee2014-01-06 10:59:16 -0800658 { X86_VENDOR_INTEL, 6, model, X86_FEATURE_APERFMPERF,\
659 (unsigned long)&policy }
Dirk Brandewie93f08222013-02-06 09:02:13 -0800660
661static const struct x86_cpu_id intel_pstate_cpu_ids[] = {
Dirk Brandewie016c8152013-10-21 09:20:34 -0700662 ICPU(0x2a, core_params),
663 ICPU(0x2d, core_params),
Dirk Brandewie19e77c22013-10-21 09:20:35 -0700664 ICPU(0x37, byt_params),
Dirk Brandewie016c8152013-10-21 09:20:34 -0700665 ICPU(0x3a, core_params),
666 ICPU(0x3c, core_params),
667 ICPU(0x3e, core_params),
668 ICPU(0x3f, core_params),
669 ICPU(0x45, core_params),
670 ICPU(0x46, core_params),
Dirk Brandewie93f08222013-02-06 09:02:13 -0800671 {}
672};
673MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids);
674
675static int intel_pstate_init_cpu(unsigned int cpunum)
676{
677
678 const struct x86_cpu_id *id;
679 struct cpudata *cpu;
680
681 id = x86_match_cpu(intel_pstate_cpu_ids);
682 if (!id)
683 return -ENODEV;
684
685 all_cpu_data[cpunum] = kzalloc(sizeof(struct cpudata), GFP_KERNEL);
686 if (!all_cpu_data[cpunum])
687 return -ENOMEM;
688
689 cpu = all_cpu_data[cpunum];
690
691 intel_pstate_get_cpu_pstates(cpu);
Rafael J. Wysocki98a947a2013-12-31 13:37:46 +0100692 if (!cpu->pstate.current_pstate) {
693 all_cpu_data[cpunum] = NULL;
694 kfree(cpu);
695 return -ENODATA;
696 }
Dirk Brandewie93f08222013-02-06 09:02:13 -0800697
698 cpu->cpu = cpunum;
Dirk Brandewie016c8152013-10-21 09:20:34 -0700699
Dirk Brandewie93f08222013-02-06 09:02:13 -0800700 init_timer_deferrable(&cpu->timer);
701 cpu->timer.function = intel_pstate_timer_func;
702 cpu->timer.data =
703 (unsigned long)cpu;
704 cpu->timer.expires = jiffies + HZ/100;
705 intel_pstate_busy_pid_reset(cpu);
Dirk Brandewie93f08222013-02-06 09:02:13 -0800706 intel_pstate_sample(cpu);
707 intel_pstate_set_pstate(cpu, cpu->pstate.max_pstate);
708
709 add_timer_on(&cpu->timer, cpunum);
710
711 pr_info("Intel pstate controlling: cpu %d\n", cpunum);
712
713 return 0;
714}
715
716static unsigned int intel_pstate_get(unsigned int cpu_num)
717{
718 struct sample *sample;
719 struct cpudata *cpu;
720
721 cpu = all_cpu_data[cpu_num];
722 if (!cpu)
723 return 0;
724 sample = &cpu->samples[cpu->sample_ptr];
725 return sample->freq;
726}
727
728static int intel_pstate_set_policy(struct cpufreq_policy *policy)
729{
730 struct cpudata *cpu;
Dirk Brandewie93f08222013-02-06 09:02:13 -0800731
732 cpu = all_cpu_data[policy->cpu];
733
Dirk Brandewied3929b82013-03-05 14:15:26 -0800734 if (!policy->cpuinfo.max_freq)
735 return -ENODEV;
736
Dirk Brandewie93f08222013-02-06 09:02:13 -0800737 if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) {
738 limits.min_perf_pct = 100;
739 limits.min_perf = int_tofp(1);
740 limits.max_perf_pct = 100;
741 limits.max_perf = int_tofp(1);
742 limits.no_turbo = 0;
Srinivas Pandruvadad1b68482013-04-09 22:38:18 +0000743 return 0;
Dirk Brandewie93f08222013-02-06 09:02:13 -0800744 }
Srinivas Pandruvadad1b68482013-04-09 22:38:18 +0000745 limits.min_perf_pct = (policy->min * 100) / policy->cpuinfo.max_freq;
746 limits.min_perf_pct = clamp_t(int, limits.min_perf_pct, 0 , 100);
747 limits.min_perf = div_fp(int_tofp(limits.min_perf_pct), int_tofp(100));
748
Dirk Brandewied8f469e2013-05-07 08:20:26 -0700749 limits.max_policy_pct = policy->max * 100 / policy->cpuinfo.max_freq;
750 limits.max_policy_pct = clamp_t(int, limits.max_policy_pct, 0 , 100);
751 limits.max_perf_pct = min(limits.max_policy_pct, limits.max_sysfs_pct);
Srinivas Pandruvadad1b68482013-04-09 22:38:18 +0000752 limits.max_perf = div_fp(int_tofp(limits.max_perf_pct), int_tofp(100));
Dirk Brandewie93f08222013-02-06 09:02:13 -0800753
754 return 0;
755}
756
757static int intel_pstate_verify_policy(struct cpufreq_policy *policy)
758{
Viresh Kumarbe49e342013-10-02 14:13:19 +0530759 cpufreq_verify_within_cpu_limits(policy);
Dirk Brandewie93f08222013-02-06 09:02:13 -0800760
761 if ((policy->policy != CPUFREQ_POLICY_POWERSAVE) &&
762 (policy->policy != CPUFREQ_POLICY_PERFORMANCE))
763 return -EINVAL;
764
765 return 0;
766}
767
Paul Gortmaker27609842013-06-19 13:54:04 -0400768static int intel_pstate_cpu_exit(struct cpufreq_policy *policy)
Dirk Brandewie93f08222013-02-06 09:02:13 -0800769{
770 int cpu = policy->cpu;
771
772 del_timer(&all_cpu_data[cpu]->timer);
773 kfree(all_cpu_data[cpu]);
774 all_cpu_data[cpu] = NULL;
775 return 0;
776}
777
Paul Gortmaker27609842013-06-19 13:54:04 -0400778static int intel_pstate_cpu_init(struct cpufreq_policy *policy)
Dirk Brandewie93f08222013-02-06 09:02:13 -0800779{
Dirk Brandewie93f08222013-02-06 09:02:13 -0800780 struct cpudata *cpu;
Dirk Brandewie52e0a502013-10-15 11:06:14 -0700781 int rc;
Dirk Brandewie93f08222013-02-06 09:02:13 -0800782
783 rc = intel_pstate_init_cpu(policy->cpu);
784 if (rc)
785 return rc;
786
787 cpu = all_cpu_data[policy->cpu];
788
789 if (!limits.no_turbo &&
790 limits.min_perf_pct == 100 && limits.max_perf_pct == 100)
791 policy->policy = CPUFREQ_POLICY_PERFORMANCE;
792 else
793 policy->policy = CPUFREQ_POLICY_POWERSAVE;
794
Dirk Brandewie52e0a502013-10-15 11:06:14 -0700795 policy->min = cpu->pstate.min_pstate * 100000;
796 policy->max = cpu->pstate.turbo_pstate * 100000;
Dirk Brandewie93f08222013-02-06 09:02:13 -0800797
798 /* cpuinfo and default policy values */
799 policy->cpuinfo.min_freq = cpu->pstate.min_pstate * 100000;
800 policy->cpuinfo.max_freq = cpu->pstate.turbo_pstate * 100000;
801 policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
802 cpumask_set_cpu(policy->cpu, policy->cpus);
803
804 return 0;
805}
806
807static struct cpufreq_driver intel_pstate_driver = {
808 .flags = CPUFREQ_CONST_LOOPS,
809 .verify = intel_pstate_verify_policy,
810 .setpolicy = intel_pstate_set_policy,
811 .get = intel_pstate_get,
812 .init = intel_pstate_cpu_init,
813 .exit = intel_pstate_cpu_exit,
814 .name = "intel_pstate",
Dirk Brandewie93f08222013-02-06 09:02:13 -0800815};
816
Dirk Brandewie6be26492013-02-15 22:55:10 +0100817static int __initdata no_load;
818
Dirk Brandewieb563b4e2013-03-22 01:29:28 +0100819static int intel_pstate_msrs_not_valid(void)
820{
821 /* Check that all the msr's we are using are valid. */
822 u64 aperf, mperf, tmp;
823
824 rdmsrl(MSR_IA32_APERF, aperf);
825 rdmsrl(MSR_IA32_MPERF, mperf);
826
Dirk Brandewie016c8152013-10-21 09:20:34 -0700827 if (!pstate_funcs.get_max() ||
828 !pstate_funcs.get_min() ||
829 !pstate_funcs.get_turbo())
Dirk Brandewieb563b4e2013-03-22 01:29:28 +0100830 return -ENODEV;
831
832 rdmsrl(MSR_IA32_APERF, tmp);
833 if (!(tmp - aperf))
834 return -ENODEV;
835
836 rdmsrl(MSR_IA32_MPERF, tmp);
837 if (!(tmp - mperf))
838 return -ENODEV;
839
840 return 0;
841}
Dirk Brandewie016c8152013-10-21 09:20:34 -0700842
Dirk Brandewiee0a261a2013-10-30 08:38:32 -0700843static void copy_pid_params(struct pstate_adjust_policy *policy)
Dirk Brandewie016c8152013-10-21 09:20:34 -0700844{
845 pid_params.sample_rate_ms = policy->sample_rate_ms;
846 pid_params.p_gain_pct = policy->p_gain_pct;
847 pid_params.i_gain_pct = policy->i_gain_pct;
848 pid_params.d_gain_pct = policy->d_gain_pct;
849 pid_params.deadband = policy->deadband;
850 pid_params.setpoint = policy->setpoint;
851}
852
Dirk Brandewiee0a261a2013-10-30 08:38:32 -0700853static void copy_cpu_funcs(struct pstate_funcs *funcs)
Dirk Brandewie016c8152013-10-21 09:20:34 -0700854{
855 pstate_funcs.get_max = funcs->get_max;
856 pstate_funcs.get_min = funcs->get_min;
857 pstate_funcs.get_turbo = funcs->get_turbo;
858 pstate_funcs.set = funcs->set;
Dirk Brandewie007bea02013-12-18 10:32:39 -0800859 pstate_funcs.get_vid = funcs->get_vid;
Dirk Brandewie016c8152013-10-21 09:20:34 -0700860}
861
Adrian Huangfbbcdc02013-10-31 23:24:05 +0800862#if IS_ENABLED(CONFIG_ACPI)
863#include <acpi/processor.h>
864
865static bool intel_pstate_no_acpi_pss(void)
866{
867 int i;
868
869 for_each_possible_cpu(i) {
870 acpi_status status;
871 union acpi_object *pss;
872 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
873 struct acpi_processor *pr = per_cpu(processors, i);
874
875 if (!pr)
876 continue;
877
878 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
879 if (ACPI_FAILURE(status))
880 continue;
881
882 pss = buffer.pointer;
883 if (pss && pss->type == ACPI_TYPE_PACKAGE) {
884 kfree(pss);
885 return false;
886 }
887
888 kfree(pss);
889 }
890
891 return true;
892}
893
894struct hw_vendor_info {
895 u16 valid;
896 char oem_id[ACPI_OEM_ID_SIZE];
897 char oem_table_id[ACPI_OEM_TABLE_ID_SIZE];
898};
899
900/* Hardware vendor-specific info that has its own power management modes */
901static struct hw_vendor_info vendor_info[] = {
902 {1, "HP ", "ProLiant"},
903 {0, "", ""},
904};
905
906static bool intel_pstate_platform_pwr_mgmt_exists(void)
907{
908 struct acpi_table_header hdr;
909 struct hw_vendor_info *v_info;
910
911 if (acpi_disabled
912 || ACPI_FAILURE(acpi_get_table_header(ACPI_SIG_FADT, 0, &hdr)))
913 return false;
914
915 for (v_info = vendor_info; v_info->valid; v_info++) {
916 if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE)
917 && !strncmp(hdr.oem_table_id, v_info->oem_table_id, ACPI_OEM_TABLE_ID_SIZE)
918 && intel_pstate_no_acpi_pss())
919 return true;
920 }
921
922 return false;
923}
924#else /* CONFIG_ACPI not enabled */
925static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; }
926#endif /* CONFIG_ACPI */
927
Dirk Brandewie93f08222013-02-06 09:02:13 -0800928static int __init intel_pstate_init(void)
929{
Dirk Brandewie907cc902013-03-05 14:15:27 -0800930 int cpu, rc = 0;
Dirk Brandewie93f08222013-02-06 09:02:13 -0800931 const struct x86_cpu_id *id;
Dirk Brandewie016c8152013-10-21 09:20:34 -0700932 struct cpu_defaults *cpu_info;
Dirk Brandewie93f08222013-02-06 09:02:13 -0800933
Dirk Brandewie6be26492013-02-15 22:55:10 +0100934 if (no_load)
935 return -ENODEV;
936
Dirk Brandewie93f08222013-02-06 09:02:13 -0800937 id = x86_match_cpu(intel_pstate_cpu_ids);
938 if (!id)
939 return -ENODEV;
940
Adrian Huangfbbcdc02013-10-31 23:24:05 +0800941 /*
942 * The Intel pstate driver will be ignored if the platform
943 * firmware has its own power management modes.
944 */
945 if (intel_pstate_platform_pwr_mgmt_exists())
946 return -ENODEV;
947
Dirk Brandewie016c8152013-10-21 09:20:34 -0700948 cpu_info = (struct cpu_defaults *)id->driver_data;
949
950 copy_pid_params(&cpu_info->pid_policy);
951 copy_cpu_funcs(&cpu_info->funcs);
952
Dirk Brandewieb563b4e2013-03-22 01:29:28 +0100953 if (intel_pstate_msrs_not_valid())
954 return -ENODEV;
955
Dirk Brandewie93f08222013-02-06 09:02:13 -0800956 pr_info("Intel P-state driver initializing.\n");
957
Wei Yongjunb57ffac2013-05-13 08:03:43 +0000958 all_cpu_data = vzalloc(sizeof(void *) * num_possible_cpus());
Dirk Brandewie93f08222013-02-06 09:02:13 -0800959 if (!all_cpu_data)
960 return -ENOMEM;
Dirk Brandewie93f08222013-02-06 09:02:13 -0800961
962 rc = cpufreq_register_driver(&intel_pstate_driver);
963 if (rc)
964 goto out;
965
966 intel_pstate_debug_expose_params();
967 intel_pstate_sysfs_expose_params();
Dirk Brandewieb69880f2014-01-16 10:32:25 -0800968
Dirk Brandewie93f08222013-02-06 09:02:13 -0800969 return rc;
970out:
Dirk Brandewie907cc902013-03-05 14:15:27 -0800971 get_online_cpus();
972 for_each_online_cpu(cpu) {
973 if (all_cpu_data[cpu]) {
974 del_timer_sync(&all_cpu_data[cpu]->timer);
975 kfree(all_cpu_data[cpu]);
976 }
977 }
978
979 put_online_cpus();
980 vfree(all_cpu_data);
Dirk Brandewie93f08222013-02-06 09:02:13 -0800981 return -ENODEV;
982}
983device_initcall(intel_pstate_init);
984
Dirk Brandewie6be26492013-02-15 22:55:10 +0100985static int __init intel_pstate_setup(char *str)
986{
987 if (!str)
988 return -EINVAL;
989
990 if (!strcmp(str, "disable"))
991 no_load = 1;
992 return 0;
993}
994early_param("intel_pstate", intel_pstate_setup);
995
Dirk Brandewie93f08222013-02-06 09:02:13 -0800996MODULE_AUTHOR("Dirk Brandewie <dirk.j.brandewie@intel.com>");
997MODULE_DESCRIPTION("'intel_pstate' - P state driver Intel Core processors");
998MODULE_LICENSE("GPL");